1418 results about "Dc circuit" patented technology

The present invention provides a Bluetooth controllable electrical appliance, comprising: a circuit substrate; a Bluetooth communication chip disposed on the circuit substrate, wherein the Bluetooth communication chip is compatible with a Bluetooth 4.0 or later protocol; a microcontroller disposed on the circuit substrate and electrically connected to the Bluetooth communication chip, for receiving a command from the external remote controller; an AC to DC circuit disposed on the circuit substrate; and one or more actuators selected from the group consisting of a motor, a heating coil, resistor or transistor, and a combination thereof.

The present invention discloses a high efficiency constant current LED driver, which comprises a rectification bridge, a PFC main circuit, an isolated DC / DC converter, a PFC controller and a PFC bus control circuit. Since the input voltage is an intermediate PFC bus voltage, which varies with the output voltage of the DC / DC converter. When the isolated DC / DC converter is an LLC resonant circuit, the operating frequency of the LLC circuit is close to the resonant frequency within a wide output voltage range. Thus, the gain range and the operating frequency is narrow, and can enable the constant current module to work with a high efficiency at a wide output voltage range. When the isolated DC / DC converter is a symmetric half bridge, or an asymmetric half bridge or a full bridge circuit, the duty cycle of DC / DC circuit is close to 50% within a wide output voltage range. Thus, the changing range of the duty cycle of the DC / DC converter will be narrow and can improve the efficiency dramatically.

The invention discloses a green power converter which omits the pulse width modulation (PWM) technique in the traditional power converter, does not have high-frequency power device, does not generate EMI interference, simultaneously adopts the symmetry basic primitive (SBP) technique, the amplitude high modulate (AHM) technique and the dynamic rectification (DR) technique, and only needs to perform traditional power conversion on a small part of the input power so as to acquire the whole output power, namely that a large part of the output power neither need traditional power conversion nor need to pass through a magnetic core transformer. The input AC voltage neither needs to be rectified and filtered nor has large inductance and large capacitance, thus the power factor is 1, and the total harmonic distortion (THD) is 0. A transformer secondary side adopts dynamic rectification, can acquire a DC circuit, and can also acquire an AC voltage. The circuit complexity, the power consumption and the failure rate of the whole green power converter are greatly lowered, and the power converter can be applied in all the fields to replace the traditional power converter.

A Voltage Source Converter (VSC) (10) with Neutral-Point-Clamped (NPC) topology with one or more phases, comprises an intermediate DC circuit having at least a first and a second capacitance connected in series between a positive terminal and a negative terminal, providing a central tap terminal between both capacitances, and at least one sub-circuit for generating one phase of an alternating voltage, each sub-circuit comprising an AC terminal for supplying a pulsed voltage; a circuit arrangement of the form of a conventional NPC converter, with a first series connection of at least two switches between said AC terminal and said positive terminal, a second series connection of at least two switches between said AC terminal said negative terminal, and switchable connections from said central tap terminal to the centers of both two-switch series connections; and additional first and second auxiliary switches assigned to said two-switch series connections.

A terminal structure for power electronics circuits reduces the need for a DC bus and thereby the incidence of parasitic inductance. The structure is secured to a support that may receive one or more power electronic circuits. The support may aid in removing heat from the circuits through fluid circulating through the support. The support may form a shield from both external EMI / RFI and from interference generated by operation of the power electronic circuits. Features may be provided to permit and enhance connection of the circuitry to external circuitry, such as by direct contact between the terminal assembly and AC and DC circuit components. Modular units may be assembled that may be coupled to electronic circuitry via plug-in arrangements or through interface with a backplane or similar mounting and interconnecting structures.

A hybrid propulsion system for powering vehicles such as class 8 DOT classified semi-tractor trucks under normal load conditions and at highway speeds comprises an internal combustion engine, an AC generator powered by the engine, DC battery packs, an AC / DC controller, and an AC electric motor driving the drive train of the vehicle. The AC generator and the DC battery packs provide input to the AC / DC controller, which, in turn, converts the DC input from the DC battery packs via a DC circuit to AC so that the output from the AC / DC controller to the electric motor is AC for powering the vehicle. The DC battery packs may comprise thin plate flooded lead acid cells and may be connected in series, in parallel or a combination thereof. Vehicles may be retrofitted to incorporate the propulsion system.

The invention relates to an alternate current / direct current (AC / DC) energy converter, and aims to provide a high-efficiency AC / DC combined convertor with a wide output voltage range. The convertor of the invention comprises a filter, a rectifier bridge B1, a Buck PFC circuit, an uncontrollable DC / DC circuit, an output filter capacitor Co and a parallel AC / DC circuit, wherein the filter is connected with the rectifier bridge B1; a control terminal of a switching tube S1 in the Buck PFC circuit is connected with the output of a Buck PFC control circuit; the Buck PFC control circuit is connected with the output of a feedback control circuit; the feedback control circuit comprises an error amplifier and a signal isolating circuit; and the output side of the output filter capacitor Co is sequentially connected with an output signal sampling circuit, the error amplifier and the signal isolating circuit. The invention acquires high efficiency and high power factors when isolation and the wide output voltage range are realized, improves the efficiency of the AC / DC convertor connected with the Buck PFC circuit in parallel, can solve the problem of too high starting up surge current of a boost power-factor correction (Boost) circuit, and does not need a surge current suppressing circuit, thus improving the efficiency.

The invention discloses an intelligent charging system and charging method of a power car lithium battery pack. The system comprises a power-supply filter module, a PFC power factor correction module and a DC-DC module. The system is characterized in that the system also comprises a DC-DC driving module and a SCM control unit, wherein the SCM control unit is used to output two-channel PWM waveform, and the two-channel PWM waveform is amplified by the DC-DC driving module to control the on / off of an MOS tube in the DC-DC module, thus the DC-DC module is controlled to output voltage and current and the optimal charging curve is tracked. By using the intelligent charging method of the invention, the lithium battery pack with a certain capacity and voltage range can be automatically charged, and the automatic charging maintenance can be performed. The method uses the SCM to output PWM wave and control the DC-DC circuit, thus controlling the charging voltage and current without using the DC-DC control circuit and DA switching circuit, reducing the cost of charger and increasing the control precision.

The system mainly consists of the solar energy photo-volt battery (PV) and the semi-conductor thermo electric generator module (SG). The hot end insulated heat-lead board of SG contacts with the bottom electrode of PV via the heat-lead silica gel. PV and SG connect to the power supply circuit via a lead. The hot end insulated heat-lead board of SG contacts with the radiator via the heat-lead silica gel. The energy produced by PV and the energy output by SG and boosted by a DC / DC circuit are stored respectively into the different lithium ion batteries. Via control and distribution by the consequent power circuit, these energies are converted into the DC working voltage. The invention utilizes fully the low-level heat energy and solves the problem of PV performance under hi temperature. The invention raises the generating efficiency and extends PV life.

A dc breaker is connected in a main current path between a first dc circuit and a second dc circuit. The dc breaker has a primary current path connected to the main current path. A mechanical interrupter switch and an electronic breaker switch are connected in series in the primary current path. A secondary current path is provided in parallel with the primary current path. A capacitor is arranged in the secondary current path so as to be connected in parallel with the series-connected switches of the primary current path.

An electric power converter includes a DC to DC converter section adjusting DC power of a battery with at least two units in series, a DC circuit having at least two DC link capacitors in series between a positive and a negative line from the DC to DC converter section, an electric power converter section connected to the DC circuit to convert DC electric power to AC electric power for a motor, a bilateral switching circuit connecting an intermediate potential point between the capacitors and an AC output point in the electric power converter section, and a short-circuit between the intermediate potential point of the DC circuit and an intermediate potential point between the battery units. Normal operation of a load is ensured even when the battery, the capacitor in the DC circuit or the switching device in the electric power converter section becomes abnormal, while achieving high efficiency.

The invention discloses a variable power point tracking control method of a two-stage type no-energy-storage photovoltaic virtual synchronization machine, and belongs to the technical field of new energy power systems and micro-grids. The variable power point tracking control method comprises the steps of changing an original single augmented variable mode into a mode of judging whether an SUdc(k) represented DC bus voltage value is steady based on a DC bus voltage through improving the conventional perturbation observation MPPT (Maximum Power Point Tracking) method for DC / DC circuit control in a two-stage type photovoltaic system; and giving full play of a regulation effect of a DC / DC converter on the output power of a photovoltaic battery. Inertia support for the virtual synchronization machine and energy supply needed by one regulation are realized under the precondition of not adding any energy storage device; and control of the photovoltaic virtual synchronization machine is realized by combining a VSG control strategy of an inverter. When a load changes suddenly or the external environment condition changes, the photovoltaic system can reflect the characteristics of the synchronization machine, can keep steady system voltage / frequency and power balance, and can realize variable power point tracking relevant to the DC bus voltage.

A DC circuit 110 is provided to convert the voltage of a commercial AC power supply 100 into a DC voltage having a fixed level and output the DC voltage irrespective of the level of the voltage. The rectifier circuit 110 includes contacts 117, 118 and 119 and functions as one of a full-wave doubler voltage rectifier circuit and a full-wave rectifier circuit according to the opening and closing of each of the contacts.

Disclosed in the present invention is a four-port power electronic transformer based on a hybrid modular multilevel converter (MMCs). The four-port power electronic transformer includes a hybrid MMC, direct current (DC) / DC converters, and an inverter. Each DC / DC converter includes a front stage part, a high frequency transformation part and a back stage part. Compared with an existing power electronic transformer, the present invention has the following characteristics: an MMC module and a front stage of a DC / DC circuit connected to the MMC module jointly complete DC fault ride-through, and the number of adopted devices is small; the MMC module controls a DC voltage and the DC / DC circuit controls power; voltages of one or two capacitors in the module can be controlled independently or simultaneously; and the four-port power electronic transformer has four ports: a high-voltage DC port, a high-voltage alternating current (AC) port, a low-voltage DC port, and a low-voltage AC port, and is applicable to a high-voltage high-power scenario with multiple voltage types and levels, particularly to the energy internet to be used as an energy router and the like.

The invention provides an embedded energy storage type multi-module series-connected photovoltaic DC (direct current) boost converter and an application method. The embedded energy storage type multi-module series-connected photovoltaic DC boost converter comprises multiple photovoltaic DC boost converter submodules which are connected in series sequentially, wherein each photovoltaic DC boost converter submodule comprises a hybrid energy storage module, an isolated type full-bridge DC-DC circuit, a two-way boost / buck converter and a photovoltaic array, the hybrid energy storage module is used for balancing power output by the photovoltaic DC boost converter submodule, the isolated type full-bridge DC-DC circuit is used for realizing voltage boosting and maximum power point tracking, and the two-way boost / buck converter is used for controlling output power of the hybrid energy storage module. The system can eliminate influence of input power mismatch on normal operation of the photovoltaic DC boost converter fundamentally, a low-voltage DC bus is not needed, meanwhile, reliability of the system is enhanced, and internal fault isolation is convenient; a header box is not required to be arranged, the system is convenient to maintain, and overall control response speed under the special condition of a power station is increased.

The LED desk light has more than one function which has area illumination by LED light source and incorporate with at least one but not limited other functions select from charge other electric device(s) from built-in USB port(s) or USB-unit(s) or USB-module(s), a display of light beams from the LED, projection of an image, projection of a time image, clock functions, illumination of an area, playing of music, serving as a source of alternating current (AC) power or electric signals, display of photos, wire or wireless transmission of digital signals, providing air flow at a desired temperature, generating moisture, steam, or smells, dispensing liquid, brewing coffee / tea, preparing food, and displaying charging status, night light with desired LED light variety light performance, functions, effects including but not limited for changing color, brightness, dimmer, moving effects, chasing which available from market place by IC or circuit design and powered by Outside Transformer DC power source or Inside Transformer with input AC power source though desire DC-to-DC or AC-to-DC circuits.

The light device has USB charger has AC outlet power source has though the AC-to-DC device to change from 1st Alternative current to 1st voltage Direct current and the 1st voltage DC current though the circuit-inside or IC or DC-to-DC circuit to get 2nd voltage or though more DC-to-DC devices to get more voltage DC current. The light device has At least one of voltage DC current to supply to USB Charger Charging-port output-end at 5Volt and one of desire voltage DC current to supply to DC light source. Or / The 1st AC current to AC light source and has one of DC current selected from 1st, 2nd, or more voltage DC current to USB Charger charging-port's output end so the said light device has (1) illumination function by DC or / and AC light source and (2) USB charger function by supply desired 1st or 2nd or more other voltage DC current to USB charging-port at 5Volt DC. The light device optional has outlet-ports to get 1st AC directly though conductive parts to outlet-ports to supply AC to other device. Furthermore, the light device Optional can add other function(s) select from (a) Time piece related (b) Reflect Image (c) Power station (d) project image (e) heater (f) Air Flow (g) wireless communication (h) remote controller (g) APP controller (h) Blue-tooth controller.

An object is to detect an insulation failure of a DC circuit with high sensitivity and in safety by means of a simple detection circuit. An insulation resistance measurement device of this invention is a device for measuring an insulation resistance to ground of a DC source circuit and is provided with connection terminals for connections to a positive electrode and a negative electrode of a series power supply, switch elements connected between the connection terminals and the ground potential and configured to switch connections between the connection terminals and the ground potential, resistive elements connected through the switch elements between the connection terminals, respectively, and the ground potential, and a voltage detection unit for detecting voltage drops in the resistive elements.

A semiconductor device including a positive polarity wiring plate, negative wiring plate, more than one output wiring plate, semiconductor switch element and conductive buffer or "cushion" member is disclosed. The semiconductor switch element and cushion member are compressively interposed between the output wiring plate and positive wiring plate and also between the output wiring plate and negative wiring plate to thereby constitute bridge circuitry. The positive wiring plate, negative wiring plate or output wiring plate is for use as one support body of a pressurization structure. With such an arrangement, it is possible to improve the heat releasability of semiconductor elements while at the same time reducing the inductance of direct current (DC) circuitry to thereby suppress heat generation of the semiconductor elements, thus increasing the reliability relative to temperature cycles.

Power is transmitted based on magnetic resonance from a feeding coil L2 to a receiving coil L3. An adjustment circuit 104 of a wireless power receiver 118 is supplied with a first AC power received by the receiving coil L3. An adjustment circuit 104 includes a DC circuit 106 and an AC circuit 150. The DC circuit 106 converts the first AC power into DC power. The AC circuit 150 converts the DC power into a second AC power. The adjustment circuit 104 outputs the DC power and second AC power simultaneously or selectively through separate channels.

The invention provides a USB (universal serial bus) interface charge handshaking method and a quickly-chargeable power adapter. The method includes that the power adapter and USB equipment are connected through a USB cable; a charge management circuit of the USB equipment controls connection and disconnection of a VBUS according to agreed codes precured by the USB equipment; the power adapter restores the agreed codes precured on the USB equipment by identifying connection and disconnection of the VBUS; if the restored agreed codes on the USB equipment are consistent with agreed codes precured by the power adapter, showing that handshaking succeeds, and otherwise, showing that handshaking fails. The power adapter comprises a VBUS current detection circuit, a control circuit A and an AC / DC (alternating current / direct current) circuit, wherein the control circuit A and the AC / DC circuit are connected to the output end of the VBUS current detection circuit sequentially. On the premise that output current of the power adapter is unchanged, output voltage provided by the power adapter to the USB equipment is increased, higher input power is provided, and charging is accelerated.

A charge-discharge two-way power converter for a battery for an electric car adopts the structure that an input port (In) connected with a storage battery and an output port (Out) connected with a grid are mounted outside a main circuit; the main circuit is connected with a control circuit; the main circuit comprises a battery side filter circuit (1), a like-polarity bi-directional DC / DC converter (2), and a high-frequency isolation DC / DC circuit (3), a three-phase three-level circuit (4) and a grid side filter circuit (5) which are sequentially connected; and the control circuit comprises a DSP main controller (6), an MCU auxiliary controller (7) and an LCD or 485 communication circuit (8). According to the invention, the circuit adopts comparatively less elements, the intelligent degree is high, self detection and fault protection functions are provided, the equipment and operation costs are saved, the conversion efficiency is high, the working process is quick, stable, and controllable, the size is small, the dynamic property is good, and the purposes of environmental protection and energy conservation are achieved.

The light device has USB charger has AC outlet power source and has AC-to-DC circuit to change one of Alternative current to 1st voltage DC and the 1st voltage DC though the circuit-inside or IC or DC-to-DC circuit to get 2nd voltage or though more DC-to-DC devices to get more voltage DC current. The light device has at least one of 5 Volt DC to supply to USB Charger Charging-port output-end and one of desire voltage DC to supply to DC light source. Or / The 1st AC to AC light source and has one of DC selected from 1st, 2nd, or more voltage DC current to USB Charger charging-port's output end so the said light device has (1) illumination function by DC or / and AC light source and (2) USB charger function by supply desired 1st or 2nd or more other voltage DC current to USB charging-port at 5 Volt DC. The light device optional has outlet-ports to get 1st AC directly though conductive parts to outlet-ports to supply AC to other device. Furthmor, the light device Optional can add other function(s) select from (a) Time piece related (b) Reflect Image (c) Power station (d) project image (e) heater (f) Air Flow (g) wireless communication (h) remote controller (g) APP controller (h) Blue-tooth controller.

A universal solar illuminator system (100) is mounted to a flagpole apparatus (102) having a flagpole (104) and flag (106). The illuminator system (100) includes an elongated structure (120) opening outwardly and exposing a recessed area (123) having a rear, curved surface (125). The system (100) also includes an LED network (126) having a series of LED's (124) energized through a DC circuit (127) from a series battery pack (138). Solar panels (150, 152) charge the series battery pack (138) during daylight conditions.

A DC / DC (direct current / direct current) circuit for a UPS (uninterrupted power supply) is a two-way DC / DC circuit and is connected with a battery and a bus; the two-way DC / DC circuit takes power from the bus to charge the battery in a mains supply mode; when a mains supply is abnormal, the two-way DC / DC circuit is in a working state that the battery supplies the power to the bus; the two-way DC / DC circuit comprises an isolation transformer; a primary side of the isolation transformer is connected with a push-pull circuit or a half-bridge circuit or a full-bridge circuit; a secondary side of the isolation transformer is connected with the push-pull circuit or the half-bridge circuit or the full-bridge circuit; the isolation transformer is provided with a plurality of controllable taps; and the two-way DC / DC circuit selects the taps on the primary side or the secondary side of the isolation transformer to conduct turn ratio switching for adjusting charging and discharging voltage. The DC / DC circuit for the UPS allows a UPS system to be more simplified, and lowers the cost of the system.

A mixed hydrogen-oxygen fuel generator system uses an electrolytic solution to generate gaseous hydrogen-oxygen fuel through the electrolysis of water. This generator system includes: at least one electrolytic cell with multiple metallic plates used as an internal isolation system in which two of the plates separately connect to both the positive and negative terminal of a DC circuit. These plates are used for the electrolysis of the electrolytic solution in the cell(s) to produce, under pressure, mixed hydrogen-oxygen fuel. The apparatus also includes a cooling system containing a water cooling tank in which there are two zones: one is the electrolytic solution circulation coil and the another is a water circulation zone. The cooler provides the circulating, cooling water used to adjust the temperature of the operating cell and of the electrolyte solution to within a given temperature range in order to ensure that the cell is not affected by excessively elevated temperatures that can stop operations due to cell overheating. Another effect of this cooling system is to precipitate moisture out of the generated gas products. The ignition flame temperature of the gaseous fuel produced can be adjusted for specific applications by passage of the hydrogen / oxygen gas stream through a temperature-control fluid. Thus, continuous 24 hours operation can be achieved along with better gas production efficiency and fuel cell energy generation.

The invention relates to electric-power, electron and electric-energy circuits, aim to provide an isolated soft switching two-diode forward resonant DC / DC (direct-current / direct-current) circuit. The circuit comprises a power source, two switching diodes, two clamping diodes, a high-frequency isolation transformer, a primary winding, a secondary winding, an output rectifier diode and an output filter capacitor, and further comprises an input side inductor, a resonant inductor and a resonant capacitor. The resonant capacitor Cr is connected with the power source in parallel, and the input side inductor is located between the resonant capacitor and the power source. The resonant inductor is connected with the transformer primary winding in series. Load formed by the resonant inductor, the resonant capacitor and the output voltage forms resonant circuits in series. By the isolated soft switching two-diode forward resonant DC / DC circuit, a power switching diode operates while zero voltage switches on and quasi-zero current is in switched off state, voltage at two ends of the power switching diode is reduced, overlap time of current passing through the power switching diode is reduced, and switching consumption of the power switching diode is reduced; energy on parasitic inductors or capacitors can be recovered, and energy converting efficiency is improved; energy consumption on the circuit is reduced, and energy is saved.

The invention discloses a SiC power device-based EV (Electric vehicle)-mounted charger. The charger comprises a main circuit and a control circuit; the main circuit comprises a rectifying and filtering module and an LLC resonant type DC / DC circuit; and the rectifying and filtering module is of a totem pole bridgeless power factor correction circuit structure and is directly connected with a three-phase alternating-current input power source; the LLC resonant type DC-DC circuit consists of a first half-bridge LLC converter and a second half-bridge LLC converter which are of the same topology, wherein the first half-bridge LLC converter and the second half-bridge LLC converter are connected in parallel and thereafter are connected in series between the rectifying and filtering module and anoutput side; the first half-bridge LLC converter and the second half-bridge LLC converter each include comprise a half-bridge inversion module, a high-frequency voltage transformation module, and a passive rectifying and filtering module; the rectifying and filtering module and the LLC resonant type DC-DC circuit are connected with the control circuit; and the control circuit adopts an average current control mode and a PFM control mode so as to realize digital control circuit output. The SiC power device-based EV (Electric vehicle)-mounted charger of the invention has the advantages of high power output precision, high power density, high reliability and small occupied space.

The invention provides an electric automobile charging / discharging / storing integral station power flow three-level converter. A control part controls the working of circuits at all levels through a grading coordination control strategy, a first-level alternating current (AC) / direct current (DC) circuit alternating side is connected to an electric network, a direct current side is connected to a total direct current bus, the alternating current of the electric network is converted to the stable direct current and is output to the total direct current bus, a second-level DC / DC circuit high-voltage side is connected to the total direct current bus, a low-voltage side is connected to a corresponding branch direct current bus, the direct current of the total direct current bus is converted to finer direct current which can meet charging requirements of different cells and is output to a corresponding branch direct current bus, a third-level DC / DC circuit high-voltage side is connected to a corresponding branch direct current bus, a low-voltage side is connected to a storage battery group, and the storage battery group is controlled to charge / discharge evenly, finely and reasonably. The cell group can charge and discharge evenly, the best charging effect is achieved and the circulation service life of cells is improved.