43results about How to "Improve load regulation" patented technology

Switching-mode power conversion system and method thereof. The system includes a primary winding configured to receive an input voltage, and a secondary winding coupled to the primary winding and configured to, with one or more first components, generate, at an output terminal, an output voltage and an output current. Additionally, the system includes an auxiliary winding coupled to the secondary winding and configured to, with one or more second components, generate, at a first terminal, a detected voltage. Moreover, the system includes an error amplifier configured to receive the detected voltage and a first reference voltage and generate an amplified voltage based on at least information associated with a difference between the detected voltage and the first reference voltage. Also, the system includes a compensation component configured to receive the amplified voltage and generate a second reference voltage based on at least information associated with the amplified voltage.

The invention discloses a heat and humidity segmented treatment air-conditioning device and method combined with radiation cold supply. The device mainly comprises a cold water unit, an air treater, a radiation coil pipe, a water pump, an electromagnetic valve and a pipeline. In a system, chilled water obtained by the cold water unit is used for cooling and dehumidifying air, and is supplied to a ceiling or a floor radiation coil pipe for radiation cold supply to realize segmented treatment of heat and humidity loads in a room. The radiation coil pipe is used for supplying cold and bearing a part of sensible heat load in the room, and dehumidified supply air is used for bearing the other part of sensible heat load in the room and indoor humidity load and preventing a radiation surface from moisture condensation. Chilled water is segmentally applied to dehumidification and radiation cold supply, and the temperature difference between supply water and return water is about 7-10 DEG C. A refrigeration cycle of a water chilling unit is realized with a non-azeotropic refrigerant, and good temperature matching of chilled water and the refrigerant in the heat exchanger is realized by means of the temperature slippage characteristic of the non-azeotropic refrigerant, so that the performance coefficient of the unit is increased.

The invention discloses a grid-connected seamless switching controller based on a capacitive current inner ring and a control method thereof. The controller comprises a microcontroller, a voltage sampling circuit, a grid-connected switch driving circuit and an inverter power tube driving circuit, wherein the microcontroller comprises an electricity grid synchronous module, an output voltage controller, a capacitive reference current generator under a grid-connected mode, a grid inlet current controller, a capacitive current controller, a control command selecting switch and an inverter power tube logic generator. The grid-connected seamless switching controller is connected with an inverter of an electricity grid through a grid-connected switch, is in an output voltage control mode when in dependent operation with load and is in a grid inlet current control mode when in grid-connected operation. The grid-connected seamless switching controller is adaptable to a grid-connected inverter capable of independently operating with grid-connected double modes, increases output voltage load adjustment rate under an independent mode, increases power factors and grid inlet current waveform quality on the condition of non-linear load and electricity grid voltage distortion under a grid-connected mode, and then realizes seamless switching of two work modes.

The invention discloses a voltage-drop compensation method for power output lines and a switch power supply, and the key points of the technical scheme are as follows: the circuit at the feedback part of the switch power supply comprises a sampling resister 04, a reference source 03, a photoelectric coupler 02, an output capacitor 05, a power output line resister 06 and a current-limiting resister 01, wherein one end of the current-limiting resister 01 is connected with the output resister 05, and the other end thereof is connected with the photoelectric coupler 02; the photoelectric coupler 02 is connected with the cathode of the reference source 03, the anode of the reference source 03 is set as a reference ground, and the reference end of the reference source 03 is connected with the common ports of R2 and R3 of the sampling resister 04; R2 end of R2 and R3 of the serial sampling circuit 04 is connected with the output capacitor 05, and R3 end is connected with the reference ground of the reference source 03; and a compensation resister Rd is added between the reference ground of the reference source 03 and R3 of the sampling resister 04. The invention has the advantages of saving wires and improving load regulation. The invention can be used in the feedback parts of various power supplies, and comprises but is not limited to the following devices such as a flyback converter, a forward converter, a half-bridge converter, a full-bridge converter, a quasi-resonant converter and the like.

The invention discloses a modular power supply device with a reverse prevention function and a reverse-prevention control circuit. An isolation circuit and a reverse-prevention control circuit are additionally arranged on an output end of the traditional switching mode power supply module, and the reverse-prevention control circuit is used for controlling the work state of the isolation circuit so as to further make the output of the switching mode power supply module controllable. By means of the technical scheme, the circuit is simple and reliable in structure, the oscillation-free smooth switching of the switching mode power supply module can be realized, the modular efficiency is increased, and the modular load regulation rate is increased.

The invention relates to a spherical top combustion hot air furnace with annularly distributed and vertically upward-jetting burner, and its structure: the lower part of the furnace body is equipped with flue hole, furnace bottom and furnace grate, a heat storage room is in the furnace body, there is a burner between the upper part of the furnace body and the furnace top, the furnace top is made with hot air outlet, there is coal gas preheating loop in the wall body of the burner, there is combustion supporting air preheating loop in swelling body at the upper part of the coal gas preheating loop, there are coal gas outlet and top nozzle at the upper part of the coal gas preheating loop, the wall body of the burner is equipped with coal gas inlet connected with the coal gas preheating loop, the wall body of the burner at the upper part of the coal gas inlet is equipped with combustion supporting air preheating loop connected with combustion supporting air inlet and outlet, the upper part of the air outlet is equipped with air nozzle. And the invention has a special and novel structure, and skillfully solves the key problems in the gas-flow mixing, gas-flow distribution, fume preheating and other combustion courses and has huge economic and social benefits.

The invention discloses a high-voltage power supply circuit which is suitable for low-current output and is wide in input voltage range and high in load regulation rate. The output stability of a high-voltage power supply can be improved. An input filter circuit and a Buck current feed push-pull power convertor circuit conduct filtering on input voltage and then convert the input voltage into alternating-current pulse voltage which is constant in amplitude value and is with set frequency and duty ratio of a set value. An amplitude eliminating circuit performs amplitude elimination on the alternating-current pulse voltage output by the power convertor circuit. A Cockcroft-Walton voltage-multiplying rectifying-filtering circuit rectifies the alternating-current pulse voltage subjected to amplitude elimination into high voltage output. A voltage stabilizing circuit acquires and feeds back the high voltage output of the Cockcroft-Walton voltage-multiplying rectifying-filtering circuit to the control circuit. The control circuit produces a control signal for controlling the amplitude eliminating degree according a feedback result.

A switched-capacitor regulator is provided for regulating the output voltage of a voltage supply. The switched-capacitor regulator includes a supply input terminal capable of receiving a supply voltage, two or more flying capacitors, a regulation switch located between each flying capacitor and the supply input terminal, and a voltage control circuit. The activity of the regulation switches is controlled by the voltage control circuit. In one embodiment of the invention, the voltage control circuit includes a feedback resistance area having one or more feedback resistors located between the output of the flying capacitors and a ground terminal, a first gain stage connected to the feedback resistance area, and two or more second switchable gain stages, which are each connected to a regulation switch and the first gain stage. The switched-capacitor regulator operates in pseudo-continuous regulator mode using three-stage switchable operational amplifiers with time-multiplexed pole-splitting compensation.

The invention provides a converter feedback control circuit and a converter comprising the converter feedback control circuit. The feedback control circuit comprises n sub-feedback units and a weighing arithmetical unit, and n is a natural number and greater than 1; each sub-feedback unit comprises a feedback input end and a disturbing signal end; the weighing arithmetical unit comprises n signalinput ends and a signal output end, and each sub-feedback unit is used for collecting output voltage of the converter corresponding to each circuit and outputting sampling voltage to each corresponding signal input end of the weighing arithmetical unit; the weighing arithmetical unit is used for carrying out weighted sum on each sampling voltage and outputting feedback control quantity to a control end of a main power circuit unit. The feedback control circuit adopts common ground connection of the weighing arithmetical unit and transformer input primary side and an isolated feedback mode, sothat stable voltage output is respectively achieved among multiple isolated circuits, improves voltage accuracy and load regulation of each circuit of multiple mutual isolated circuit output of the converter, and reduces ripple wave noise output by a secondary circuit.

The invention relates to a dual output DC / DC power supply achieving circuit with a zero cross adjustment rate. The dual output DC / DC power supply achieving circuit comprises a direct voltage input end, an input filtering circuit, a first power conversion circuit, a first direct voltage output end, a control circuit, a second power conversion circuit and a second direct voltage output end connected with the second power conversion circuit. The direct voltage input end, the input filtering circuit, the first power conversion circuit and the first direct voltage output end are connected in sequence. The direct voltage input end is connected to the first power conversion circuit and the second power conversion circuit through the input filtering circuit. The control circuit is used for controlling the power conversion of the first power conversion circuit and the power conversion of the second power conversion circuit. The dual output DC / DC power supply achieving circuit can eliminate the influence of the cross adjustment rate fundamentally, can improve the cross adjustment performance under the condition that a dual output power supply is in an asymmetric load or dynamic change power utilization environment, and has high popularization and application value.

The invention discloses a current mode converter with self-calibration output, which aims at solving the problems in the prior art that the gain of an error amplifier is reduced and cannot meet the requirement of load regulation rate. The current mode converter specifically comprises a control logic unit, an error amplifier, a driving and dead zone control unit, a first pull-up resistor, a second pull-up resistor, a PWM (pulse width modulation) comparator and an output unit, and also comprises a digital calibration control unit, wherein the digital calibration control unit comprises a first comparator, a second comparator, a calibration module and a current mirror module. The current mode converter controls the change of current flowing through the second pull-up resistor connected on the error amplifier through the digital calibration control unit, and further changes the error voltage by a stepping method so as to maintain a smaller fluctuation of the output voltage within a wider load range and improve the load regulation rate of the system.

A power supply regulator of switching over type controlled by primary side consists of a transformer with primary side winding and an auxiliary winding being separately coupled to positive and negative electric rails, a switch being series-connected to two said windings, a control circuit coupled to switch and auxiliary winding, a supply capacity for providing power to control circuit, a dipolar body coupled to negative rail and supply capacity, leakage inductance for releasing stored energy to supply capacity through dipolar body when switch is off and for storing energy when switch is on.

Disclosed is an III-type compensation control system of a Cuk-type switch converter. The Cuk-type switch converter comprises a primary power level circuit and a secondary power level circuit, and a control level comprises a closed system formed by a feedback circuit, a comparator, an RS (reset-set) trigger, a driving circuit and an III-type compensation network of a BUCK-type switch converter. The III-type compensation control system of the Cuk-type switch converter is characterized in the III-type compensation network of the BUCK-type switch converter is improved for controlling the Cuk-type switch convert, output of the improved III-type compensation network is compared with a ramp voltage access comparator, and on and off of a power tube of the Cuk-type switch converter is controlled by a duty ratio generated by a comparative result.

The related power converter comprises: a transformer with a first / second primary winding coupled to positive / negative power supply rail, an electric crystal connected between two windings to switch the transformer, a control circuit coupled the crystal with the second winding to produce a switch signal, a supply capacitor coupled with the control circuit to supple power, and a diode coupled the negative rail and capacitor. Wherein, there is a leakage inductance on the second winding to store some energy when crystal on conduction and release the energy to capacitor when crystal cut-off. This invention can improve converter efficiency and reduces EMI.

A power converter of switching over type consists of a transformer with the first primary winding and the second primary winding being separately connected to positive and negative electric rails, a switch connected between two said windings, a control circuit coupled to switch and the second primary winding, a supply capacity for providing power to control circuit, a dipolar body coupled to negative rail and supply capacity, a leakage inductance for storing energy when switch is on and for releasing energy to supply capacity through dipolar body when switch is off.

The invention provides a primary side current control drive circuit. A primary side current drive control unit controls a switch tube according to a current reference signal and the first sampling signal outputted by a primary side current sampling unit such that primary side current is stabilized at a set value, the load current is stable, the set value is adjusted according to the compensation signal outputted by a compensation signal generation unit, the load current is not changed with the change of load voltage, the load adjustment rate is raised, and the stable current driving is realized. At the same time, through a ripple removing unit, the output ripple after the series connection of a power unit and the ripple removing unit is eliminated or reduced through the ripple removing unit, the low ripple output is realized without accelerating a loop response speed, and the problem that the output ripple and a PF value are in mutual suppression and can not be balanced at the same time in the prior art is avoided.

A ceramic flamer with better solution for uneven flame distribution, low utilization efficiency, waste of energy, short durability, pollution issue, comprises the fuel preheat ring and assistant burning gas preheat ring inside the wall of the burner, with the top of the fuel preheat ring having fuel output and top ejection opening, fuel inlet on the outside wall and fuel preheat ring vertical connection fuel input whose top having assistant air preheat ring, outside wall accessing to the assistant air inlet in perpendicular, inside the wall twisted up on the same ring with the fuel, the top location with gas ejection, and the fuel ejection forming into ring intersected distribution. It is unique and novel in structure, efficient in solving gas mixing, gas distribution, smoke preheat and other key issues.

The invention relates to a power supply regulator of switching over type controlled by primary side, which consists of a transformer with primary side winding and an auxiliary winding being separately coupled to positive and negative electric rails, a switch being series-connected to two said windings, a control circuit coupled to switch and auxiliary winding, a supply capacity for providing power to control circuit, a dipolar body coupled to negative rail and supply capacity. The auxiliary winding comprises a leakage inductance for releasing stored energy to supply capacity through diode when switch is off and for storing energy when switch is on. The setting method between the transformer and the switch in the invention can improve the efficiency of the switching over type power supply regulator and reduce the electromagnetic interference.

The invention discloses a digital switching power supply, which is composed of a main power circuit, an auxiliary power supply circuit and a DSP control circuit. The main power circuit is composed ofan AC input EMI anti-electromagnetic-interference power filter, a rectifier filter, a high-frequency converter and a high-frequency rectifier and filter output circuit. The signal output end of the ACinput EMI anti-electromagnetic-interference power filter is connected with the signal input end of the rectifier filter, the signal output end of the rectifier filter is connected with the signal input end of the high-frequency converter, and the signal output end of the high-frequency converter is connected with the high-frequency rectifier and filter output circuit. The signal output end of therectifier filter is also connected with the auxiliary power supply circuit, and the DC electrical signal output end of the auxiliary power supply circuit is connected with the DSP control circuit. Effective control on the switching power supply can be realized. The control circuit can be simplified, and the reliability of the equipment can be improved. Moreover, the digital switching power supplyhas advantages such as flexible control, fast stabilization and high load adjustment rate, and can be popularized and applied in the field of switching power supplies.

The invention discloses a current mode converter with self-calibration output, which aims at solving the problems in the prior art that the gain of an error amplifier is reduced and cannot meet the requirement of load regulation rate. The current mode converter specifically comprises a control logic unit, an error amplifier, a driving and dead zone control unit, a first pull-up resistor, a secondpull-up resistor, a PWM (pulse width modulation) comparator and an output unit, and also comprises a digital calibration control unit, wherein the digital calibration control unit comprises a first comparator, a second comparator, a calibration module and a current mirror module. The current mode converter controls the change of current flowing through the second pull-up resistor connected on theerror amplifier through the digital calibration control unit, and further changes the error voltage by a stepping method so as to maintain a smaller fluctuation of the output voltage within a wider load range and improve the load regulation rate of the system.

A current-sharing method based on UCC29002 relates to the technical field of power electronics. By adopting the working mode of a maximum current automatic current-sharing method in the invention, users can only adjust values of a sense resistor RSHUNT, amplification factor ACSA of a current detection amplifier, an adjusting resistor RADJ and error amplifier compensators REAO and CEAO according toa specific parallel system. The invention has simple peripheral circuit, high current-sharing precision, high load adjustment rate, good dynamic response, which provides a new solution for parallel operation of a DC-DC converter with + / - Sense terminal, suitable for wide promotion and application.

The invention discloses a grid-connected seamless switching controller based on a capacitive current inner ring and a control method thereof. The controller comprises a microcontroller, a voltage sampling circuit, a grid-connected switch driving circuit and an inverter power tube driving circuit, wherein the microcontroller comprises an electricity grid synchronous module, an output voltage controller, a capacitive reference current generator under a grid-connected mode, a grid inlet current controller, a capacitive current controller, a control command selecting switch and an inverter power tube logic generator. The grid-connected seamless switching controller is connected with an inverter of an electricity grid through a grid-connected switch, is in an output voltage control mode when in dependent operation with load and is in a grid inlet current control mode when in grid-connected operation. The grid-connected seamless switching controller is adaptable to a grid-connected invertercapable of independently operating with grid-connected double modes, increases output voltage load adjustment rate under an independent mode, increases power factors and grid inlet current waveform quality on the condition of non-linear load and electricity grid voltage distortion under a grid-connected mode, and then realizes seamless switching of two work modes.

The invention relates to the field of power electronic system control, in particular to a topological structure and a control method of a power supply for composition and capacity. The present invention is a topological structure of a power supply for composing and dividing capacity, including a three-phase AC / DC rectifier, an LLC resonant converter, and a voltage stabilizing capacitor C on the output side of the three-phase AC / DC rectifier. d In parallel with the LLC resonant converter, the voltage stabilizing capacitor C on the output side of the LLC resonant converter 0 Connected in parallel with the load battery E, the LLC resonant converter has bidirectional energy flow and automatic switching, and has the characteristics of constant voltage gain when the switching frequency is not higher than the resonant frequency; The output voltage of the resonant converter V 0 It is the outer loop, and the input current of the three-phase AC / DC rectifier is the inner loop; it realizes bidirectional flow of energy and automatic switching.

The invention relates to a BUCK constant voltage control circuit. The BUCK constant voltage control circuit is characterized by comprising a rectifier diode D2, a control chip, a filter capacitor C1, a sampling resistor R1, a sampling resistor R2, an inductor L1, a free-wheeling diode D1 and a capacitor C3; the cathode of the rectifier diode D2 is connected with one end of an input capacitor C2 and a leakage end of the control chip, input voltage VINac is connected between the anode of the rectifier diode D2 and the other end of the input capacitor C2, and the other end of the input capacitor C2 is connected with the circuit ground; the source end of the control chip is internally connected with the sampling end and externally connected with one end of the sampling resistor R1 and one end of the sampling resistor R2, the other end of the sampling resistor R2 is connected with one end of the inductor L1, the cathode of the free-wheeling diode D1 and the chip ground, the other end of the sampling resistor R2 is connected with the other end of the inductor L1 and one end of the capacitor C3, and the other end of the capacitor C3 and the anode of the free-wheeling diode D1 are connected with the line ground. According to the BUCK constant voltage control circuit, the chip turn-off time is controlled by an internal control signal and not influenced by external conditions, and the load regulation is increased.

The invention discloses a method for compensating the output line voltage drop of a switching power supply. The main point of the technical solution is that the switching power supply feedback part circuit includes sampling resistor 04, reference source 03, photocoupler 02, output capacitor 05, power supply output line resistor 06, current limiting resistor 01; one end of current limiting resistor 01 and output capacitor 05 The other end is connected to the photocoupler 02, the photocoupler 02 is connected to the cathode of the reference source 03, the anode of the reference source 03 is set as the reference ground, the reference terminal of the reference source 03 is connected to the sampling resistor 04 connected in series R2, R3 The common terminal is connected; the sampling resistor 04 R2 and R3 connected in series, the R2 end of the circuit is connected to the output capacitor 05, and the R3 end is connected to the reference ground of the reference source 03; a compensation resistor is added between the reference ground of the reference source 03 and the sampling resistor 04 R3 Rd. The application of the present invention: the wire material is saved, and the load adjustment rate is improved. The occasions where this circuit can be applied include the feedback part of various switching power supplies, including but not limited to: flyback converter, forward converter, half-bridge converter, full-bridge converter, quasi-resonant converter, etc.

The invention discloses an output voltage switching circuit, which is used for a secondary output sampling circuit of a switching power supply and comprises a resistor R8, a resistor R9, a resistor R10, a capacitor C7, a switch CN101 and a triode Q1, wherein a connection point of one end of the resistor R8 and one end of the resistor R9 is used for being connected with a cathode of a diode D206 ofthe secondary output sampling circuit; a connection point between the other end of the resistor R8 and the other end of the resistor R9 is connected to the collector of the transistor Q1, the base electrode of the triode Q1 is connected with one end of the resistor R10 and one end of the capacitor C7, the other end of the resistor R10 is connected with one pin of a switch CN101, the other pin ofthe switch CN101 is used for being connected with a control voltage VCC1, and the emitting electrode of the triode Q1 and the other end of the capacitor C7 are used for being connected with the groundGND2 of a secondary output sampling circuit. Whether the switching circuit intervenes in the work of the secondary output sampling circuit or not is controlled by controlling the on and off of the switch CN101, so that the switchable output voltage is realized. The circuit has the advantages of few circuit components, simple circuit, reduction of the cost and the size of a product, and maintenance of the high performance of the switching power supply.

The invention relates to a BUCK constant voltage control circuit, which is characterized in that it includes a rectifier diode D2, a control chip, a filter capacitor C1, a sampling resistor R1, a sampling resistor R2, an inductor L1, a freewheeling diode D1 and a capacitor C3; the rectifier diode The cathode of D2 is connected to one end of the input capacitor C2 and the drain end of the control chip, the anode of the rectifier diode D2 and the other end of the input capacitor C2 are connected to the input voltage VINac, and the other end of the input capacitor C2 is connected to the circuit ground; the control chip The source terminal is internally connected to the sampling terminal and externally connected to one end of the sampling resistor R1 and one end of the sampling resistor R2, the other end of the sampling resistor R2 is connected to one end of the inductor L1, the cathode of the freewheeling diode D1 and the chip ground, and the other end of the sampling resistor R1 is connected to the inductor L1 The other end of the capacitor C3 and the other end of the capacitor C3, the other end of the capacitor C3 and the anode of the freewheeling diode D1 are connected to the line ground. The off time of the chip of the present invention is controlled by an internal control signal and is not affected by external conditions, thereby improving the load regulation rate.

The application provides a primary current control drive circuit, the primary current drive control unit controls the switch tube according to the current reference signal and the first sampling signal output by the primary current sampling unit, so that the primary current is stabilized at a set value, Further, the load current is stabilized, and the set value is adjusted according to the compensation signal output by the compensation signal generating unit, so that the load current does not change with the change of the load voltage, thereby improving the load regulation rate and realizing steady current driving; at the same time, by The anti-ripple unit eliminates or reduces the output ripple after the power unit is connected in series with the anti-ripple unit; it is not necessary to speed up the loop response speed to achieve low ripple output, which avoids the output ripple in the prior art. The wave and PF value are mutually restricted, and it is difficult to take into account the problem at the same time.