1157results about How to "Stable output voltage" patented technology

The invention provides an intelligent safety monitor system of an electric power working site. The intelligent safety monitor system of the electric power working site comprises a locating sub-system, an intelligent video analysis sub-system and an intelligent safety monitor sub-system. The locating sub-system comprises a locating server, a locating label and a base station unit. The base station unit obtains the position information of the locating label by detecting UWB signals and MAC data sent by the locating label, and sends the position information to the locating server. The intelligent video analysis sub-system analyzes a video stream of the electric power working site so as to monitor the operation actions of working personnel, and gives an alarm according to the analysis result. The intelligent safety monitor sub-system comprises a locating monitor platform and a video monitor platform. Compared with the prior art, the intelligent safety monitor system of the electric power working site can effectively prevent the personnel from breaking rules, prevent or reduce personal injury of an electric power system, and be widely applied to the electric power safety working and electric power construction working site.

A DC-DC converter has converter circuit portions 11 and 12, transformers Tr.sub.1 and T r.sub.2, and rectifier circuit portions 21 and 22. Two sets of converter circuit portions 11 and 12 respectively include two pairs of switching elements Q.sub.1 to Q.sub.4, and two pairs of switching elements Q.sub.5 to Q.sub.8 connected in full bridge configuration, series capacitors C.sub.1 and C.sub.2 are inserted and connected between the converter circuit portions 11 and 12 and the transformers Tr.sub.1 and Tr.sub.2 respectively. The switching phase of one switching element Q.sub.4 or Q.sub.8 is shifted by a 1 / 3n period from the switching phase of the other switching element Q.sub.1 or Q.sub.5 in the pair of switching elements. The switching phases of corresponding switching elements Q.sub.1 and Q.sub.5 in the converter circuit portions 11 and 12 are shifted by a 1 / 2n period from each other.

A power supply apparatus and a power supply method are described, wherein the non-polar characteristics of the electrodes of a capacitor is utilized to improve the energy utilization efficiency of a battery through reciprocating switches of polarity connection between the battery and the capacitor. The voltages of the capacitors can also stay at a near constant level using the polarity reversal mechanism.

An energy harvester system is provided in and responsive to movement of a motion control arrangement of an exercise machine for converting kinetic and ambient light energy supplied from an environment of the exercise equipment into electrical power which is delivered to a feedback system associated with the exercise equipment in order to provide information corresponding to the user of the exercise equipment.

A transformer that improves the DC superposition characteristic without incurring eddy-current losses. In the transformer, a part of a plate-like core opposing a top face of a flange of a drum core is formed with a first opposing portion opposing none of input and output terminals and a second opposing portion opposing the input and output terminals. A first gap is formed between the top face and the first opposing portion by a spacer. A second gap greater than the first gap is formed by a recess of the plate-like core provided so as to correspond to the second opposing portion. This allows magnetic fluxes to pass between the top face and the first opposing portion where the gap is formed and inhibits them from passing between the plate-like core and the input and output terminals where the second gap greater than the first gap is formed.

A voltage converting circuit has an output terminal for supplying an output current at an output voltage to a load. In response to a transient of the load, a current sinking circuit allows a current source to provide a sink current flowing from the output terminal of the voltage converting circuit into a ground potential. The sink current is finite and stable. When the output voltage decreases below a threshold voltage, the current sinking circuit allows the current source to keep providing the finite and stable sink current for an extension time, causing the output voltage to decrease from the threshold voltage to a regulated value.

In a step-up / step-down DC-DC converter, an error signal commensurate with a difference between a voltage commensurate with the output voltage and a predetermined reference voltage and a triangular wave signal are compared by a first comparator, whose output is used to turn on and off a step-up switching circuit. An inverted signal obtained by inverting the error signal and the triangular wave signal are compared by a second comparator, whose output is used to turn on and off a step-down switching circuit. The median level between the outputs of the first and second comparators is set to be lower than the maximum level of the triangular wave signal and higher than the minimum level thereof. Thus, when step-up and step-down modes are switched from one to the other, an overlap period is produced during which the step-up and step-down modes overlap. This makes possible smooth switching between the step-up and step-down modes.

In a switching power source apparatus which outputs a DC output voltage converted from a DC power source voltage, the DC output voltage is compared with a reference voltage to generate a feedback signal which decreases as the DC output voltage increases. A current detecting signal which decreases as the output current increases is also generated. The smaller one of the feedback signal and the current detecting signal as a comparison signal is compared with a triangular signal in a PWM comparator to produce a PWM signal. A semiconductor switch is on-off controlled by the PWM signal. Therefore, the apparatus can perform a constant voltage control with a current limit function, which can improve the accuracy of a current limit operation, eliminate the need of a special high speed operation of a current detecting circuit and a driver and stabilize the output voltage during the operation of current limit.

A control circuit 6 of a resonance type switching power source comprises a drive circuit 21 for supplying drive pulses to each gate terminal of first and second MOS-FETs 2,3; a PWM circuit 9 for causing drive circuit 21 to produce drive pulses; an input voltage detector 7 for detecting input voltage from DC power source 1 and comparing the input voltage and input reference voltage Vref1; and a frequency adjuster 8 for adjusting oscillation frequency of PWM circuit 9 in response to output level from the input voltage detector 7. With adjustment in oscillation frequency of PWM circuit 9 in response to input voltage Vin from DC power source 1, control circuit 6 can modify on-off timing of first and second MOS-FETs 2, 3 to keep good resonating action and prevent off-resonance although DC power source 1 produces fluctuating input voltages.

A multimode voltage regulator includes a low current pass device and a high current pass device each adapted for connection between a power supply and a load; an error amplifier responsive to a difference between a reference voltage and a function of the voltage on the load to produce an error signal; and a low power driver responsive in a low load power mode to an error signal for operating the low current pass device to provide low power to the load and a high power driver responsive in a high load power mode to an error signal for operating the high current pass device to provide high power to the load for maintaining efficiency over high and low power load operation.

A low dropout voltage regulator includes a regulating circuit, an amplifier, and a first compensating path. The regulating circuit is configured to receive an input signal at an input terminal and provide an output signal at an output terminal in response to a control signal received at the control terminal. The amplifier may have a first input terminal coupled to a first input path and an output terminal be coupled to the control terminal of the regulating circuit via a path to provide the control signal. The first compensating path is coupled between a first node on the first input path and a first node on the path coupling the output terminal of the amplifier to the control terminal of the regulating circuit, the first compensating path including a first compensating capacitor.

The invention discloses a photovoltaic power generation single phase grid-connected inverter, comprising an inverter circuit, a filter circuit, a digital signal processor (DSP) main control unit, a signal detection unit, a protection circuit, a power frequency isolation transformer, an inversion drive circuit, an auxiliary power supply circuit, a man-machine interaction module, and a parallel operation communication interface. The inverter circuit is of a single-phase whole bridge structure, the direct current is sent to the power frequency isolation transformer for the isolation and the boosting after being subject to the inversion and the filtration. The signal detection unit samples the direct current voltage, the current and alternating current side grid-connected current and the grid voltage signal, which are processed by the DSP main control unit to generate a space vector pulse width modulation (SVPWM) signal, the SVPWM signal drives the inverter circuit to work through the inversion drive circuit, and the protection circuit can blockade protection of the inversion drive circuit to the grid-connected inverter. The grid-connected inverter of the invention has the advantage of stable voltage output, the direct current voltage efficiency of the solar battery can reach more than 95%, and the power generation factor is higher than 0.95.

The invention provides a hybrid excitation generator with permanent and electromagnetic series magnetic fields, and belongs to the technical field of automobile motor electric appliances. The hybrid excitation generator consists of a rotor, a stator, a front end cover, a back end cover and an electronic voltage regulation controller, wherein a radial permanent magnetic field and a salient pole electromagnetic field share the same rotor iron core; a generated magnetic field is formed through series connection in an air gap of the generator, the magnetic field intensity is high, and the power density of the generator is high; and during operation, the magnitude and the direction of the energization current of a salient pole electrical excitation rotor are adjusted to ensure that the magnetic field which is formed by superimposing the permanent magnetic field and an electrical excitation magnetic field is adjustable, the output voltage in a wide rotating speed and wide load range is kept stable, and a direct current power supply is provided for modern automobile electrical equipment.

The invention relates to a closed-loop control charge pump circuit, which comprises a basic charge pump circuit and a control loop. The control loop comprises the following circuits which are connected in turn: a sampling circuit, a comparer, an oscillation control circuit, and an oscillator, wherein the sampling circuit is connected with a voltage output end (Vout) of a basic charge pump, and isused for sampling the voltage value of the Vout and generating a sampling voltage value V1 corresponding to the voltage value of the Vout according to a predefined function mapping relation f; the comparer is used for comparing the voltage value V1 with a preset reference voltage Vref and outputting the comparison result V2; the oscillation control circuit receives the comparison result V2 and generates a control signal Ctr1 according to the V2 value; and the oscillation frequency of the oscillator is controlled by the control signal Ctr1 to change continuously, and the oscillator outputs theoscillation frequency as the working frequency of the basic charge pump. Thus, the frequency of the oscillator of the charge pump circuit can be adjusted continuously and dynamically, and the whole charge pump circuit has good power following characteristics and reduces the energy consumption.

A power supply apparatus and a power supply method are described, wherein the non-polar characteristics of the electrodes of a capacitor is utilized to improve the energy utilization efficiency of a battery through reciprocating switches of polarity connection between the battery and the capacitor. The voltages of the capacitors can also stay at a near constant level using the polarity reversal mechanism.

The invention provides a radial-tangential permanent magnet and electromagnetism mixed excitation generator, belonging to the technical field of an electrical appliance of a motor of an automobile. The excitation generator consists of rotors, a stator, a front end cover, a rear end cover and a rectifier, wherein the permanent magnet rotor and the brushless electrically-excited rotor are arranged on a shaft and commonly adopt one armature winding, a generated magnetic field is formed through combination in a parallel connection form in an air gap of the generator, and the size of the magnetic field formed by combining a permanent magnetic field and an electrically-excited magnetic field in the air gap of the generator is changed through regulating the size and the direction of the current passing the electrically-excited rotor, so as to ensure that the generator can output the direct current with stable voltage under the conditions of variable rotation speed and variable loads, thereby supplying electrical energy for electric equipment of the automobile.

A control circuit 6 of a resonance type switching power source comprises a drive circuit 21 for supplying drive pulses to each gate terminal of first and second MOS-FETs 2,3; a PWM circuit 9 for causing drive circuit 21 to produce drive pulses; an input voltage detector 7 for detecting input voltage from DC power source 1 and comparing the input voltage and input reference voltage Vref1; and a frequency adjuster 8 for adjusting oscillation frequency of PWM circuit 9 in response to output level from the input voltage detector 7. With adjustment in oscillation frequency of PWM circuit 9 in response to input voltage Vin from DC power source 1, control circuit 6 can modify on-off timing of first and second MOS-FETs 2, 3 to keep good resonating action and prevent off-resonance although DC power source 1 produces fluctuating input voltages.

A charge pump circuit of the present invention comprises a resistance voltage divider provided between a reference voltage source and an output terminal, a differential amplifier which has an inverting input terminal applied with a divided voltage portion from the resistance voltage divider and a non-inverting input terminal applied with a comparison voltage and is configured to output an output signal obtained by amplifying a potential difference between the divided voltage portion and the comparison voltage through an output terminal, a clock feeder configured to output first and second clock signals according to an original clock signal, and a pump circuit section which is applied with the first and second clock signals alternately and control an output voltage at an output terminal, and the clock feeder is configured to regulate amplitude levels of the first and second clock signals according to the voltage of the output signal.

The present invention provides a switching power supply circuit capable of stabilizing an output voltage as well as increasing a response speed of the output voltage by improving a phase margin of an open loop as a whole of the switching power supply circuit. The switching power supply circuit according to the present invention includes a resistor and a capacitor in addition to a configuration of a conventional switching power supply circuit. The resistor is connected between a node and the capacitor. The capacitor is connected between the resistor and another node. The resistor and the capacitor configure a phase compensation circuit. The phase compensation circuit has a cut-off frequency in accordance with a resonance frequency of an inductor and a capacitor by adjusting a resistance value of the resistor and a capacitance of the capacitor.

The invention discloses a high-efficiency and high-power density isolation DC-DC (Direct Current-Direct Current) conversion circuit based on GaN. The high-efficiency and high-power density isolation DC-DC conversion circuit comprises an LLC (Liquid Level Control) half-bridge soft switch, a transformer with the turn ratio of N to 1 to 1, a filter capacitor, a Fly-back auxiliary power supply circuit, an integrated LLC control UCC25600 chip circuit, a driving UCC27714 circuit, an optical coupler and output feedback PI adjusting circuit, a PEM-2-S12-S5-D voltage conversion circuit and the like, wherein a primary edge adopts a GaN device GS66502B and a secondary edge adopts a GaN device GS61004B, and the primary edge and the secondary edge are arranged in parallel to carry out synchronous rectification; an LLC resonance circuit is combined with the synchronous rectification, and a simple design of a control and driving circuit and an auxiliary power supply is adopted and a wide-input voltage range is realized; constant output voltage is 12V and 200W DC-DC conversion is realized; the circuit adopts a GaN switching device so that the efficiency and power density of a converter are realized.

A stabilized high-voltage power supply is disclosed, having a general setup similar to a pulse-step modulator. The power supply comprises a plurality of DC power modules (40) having their outputs connected in a series configuration. Each power module comprises a DC voltage source (41), a DC-DC converter (42), and an output switching circuit (43). The total output voltage of the power supply is regulated by regulating the DC link voltage at the output of each power module. This is achieved by an appropriate feedback control circuit driving the DC-DC converter of each power module. In this manlier, low output ripple and a rapid response to changes in output current can be achieved. The power supply may be used, e.g., as the cathode power supply of a gyrotron.

The invention discloses a brushless direct current reluctance starter generator. The generator comprises a three-phase armature winding, an exciting winding, a winding series-parallel switching switch, a stator iron core, a rotor iron core, a shaft, a position sensor, a bridge converter and a controller, wherein armature coils, wound intensively, are wound on each pole of the stator iron core; excitation coils are wound by crossing three stator poles; and the armature coils in the same phase are in series or parallel connection to form a group. According to the starter generator, a reluctance structure is used; no winding is generated on the rotor; the generator is simple in structure and reliable to operate; excitation current can be adjusted to keep stability of output voltage during generating; when the generator is started, the generator rotates by means of a reluctance torque; the armature coils are connected in series; a large starting torque is achieved; the generator is applicable to operation at a low speed; the excitation winding is used for generating a magnetic field during generating; the armature coils are connected in parallel; small armature reaction is generated; and the generator is applicable to operation in a high speed. The brushless direct current reluctance starter generator is very applicable to transport tools comprising vehicles.

The invention relates to a capacitor-less low dropout regulator, which comprises a first-stage amplifier, a second-stage buffer, a voltage division circuit and an output transistor, wherein an impedance device is introduced between an output end of a common drain amplification circuit of the second-stage buffer and the ground, the impedance device is an active resistor device or a passive resistor device which is used for increasing the output resistance of the second-stage buffer, effectively controlling the damping coefficient of the capacitor-less low dropout regulator and reducing the influence of complex poles on dominant poles. Frequency compensation of the capacitor-less low dropout regulator is realized, and under the condition that a capacitor device does not need to be increasedadditionally, low-dropout output voltage is ensured to be precise and stable and have low noise, and the capacitor-less low dropout regulator can be used in a circuit capable of realizing monolithic integration and driving larger capacitive load.

In a step-up / step-down DC-DC converter, an error signal commensurate with a difference between a voltage commensurate with the output voltage and a predetermined reference voltage and a triangular wave signal are compared by a first comparator, whose output is used to turn on and off a step-up switching circuit. An inverted signal obtained by inverting the error signal and the triangular wave signal are compared by a second comparator, whose output is used to turn on and off a step-down switching circuit. The median level between the outputs of the first and second comparators is set to be lower than the maximum level of the triangular wave signal and higher than the minimum level thereof. Thus, when step-up and step-down modes are switched from one to the other, an overlap period is produced during which the step-up and step-down modes overlap. This makes possible smooth switching between the step-up and step-down modes.

A layered solid-state battery that includes a first unit cell, a second unit cell, and an internal collection layer that is disposed to intervene between the first unit cell and the second unit cell. Each of the unit cells is constituted of a positive electrode layer, a solid electrolyte layer, and a negative electrode layer that are sequentially stacked. The internal collection layer is disposed to be in contact with each of the negative electrode layers of the unit cells. Also, the internal collection layer contains an electron conductive material and an ion-conductively electrically conductive specific conductive material.

A switching power supply apparatus generates a first output voltage with a reversed polarity of an input voltage and a second input voltage of double the input voltage with the reversed polarity, and then outputs them from the first output terminal and the second output terminal. A driver circuit includes a control unit and a first switch to a sixth switch. The driver circuit repeats three charging periods in a time-division manner. The three charging periods are a first charging period during which a flying capacitor is charged with the input voltage, a second charging period in which a low-potential-side terminal of the flying capacitor is connected to a ground terminal and a first output capacitor is charged with a voltage appearing at the other end of the flying capacitor, and a third charging period in which a high-potential-side of the flying capacitor is connected with the first output terminal and a second output capacitor is charged with a voltage appearing at the other end of the flying capacitor.

The invention provides an uninterrupted power system. When a first power source of the system breaks down, a second power source discharges power to a direct current bus through a bi-directional power converting unit in the process that the first power source is switched to the second power source for power supplying through a switching unit, and during the switching process, electric energy stored in the direct current bus is discharged in a short time, the discharged current of the second power source and the discharged current of the direct current bus are output to the system output end through the direct current bus, and it is guaranteed that the voltage output by the direct current bus during the neutral position period of action of the switching unit is stable; due to the fact that the discharged current of the bi-directional power converting unit supports the voltage of the direct current bus in the switching process, the requirement for the capacitance value of the direct current bus can be lowered, and meanwhile safe and reliable switching of a switching device is guaranteed; due to the fact that the bi-directional power converting unit only supports the voltage of the direct current bus in a short time when the switching device acts, the specification and size of a charger unit can be greatly reduced.

A LDO and a switching regulator are connected in parallel with each other. The power supply device selects and actuates either of the LDO or the switching regulator in accordance with a switching signal from the outside. When making the switch from the LDO to the switching regulator so as to be actuated, the power supply device causes operation periods of the LDO and the switching regulator to overlap each other. At least during the period in which the operation periods overlap each other, the power supply device makes current drive performance of a synchronous rectification transistor of the switching regulator lower and makes the same return to a normal state after the LDO stops its operation.

A power supplying circuit for generating an output voltage, which comprises: a noise detecting circuit, for receiving a first reference voltage and for generating a second reference voltage according to the output voltage and the first reference voltage, wherein a noise component of the second reference voltage is the same as which of the output voltage; a control voltage generating unit, for receiving a feedback voltage and the second reference voltage, and for generating a control voltage according to the feedback voltage and the second reference voltage; a voltage providing device, for generating the output voltage according to the control voltage and an input voltage; and a feedback module, for generating the feedback voltage according to the output voltage.