50results about How to "Improve voltage conversion efficiency" patented technology

A DC—DC converter can supply a stable output voltage from an input voltage with the power supply voltage varying along with the supply of the power and can maintain a high voltage conversion efficiency. The DC—DC converter includes an inductive element and the first-fourth switches connected to both terminals of the inductive element, the first and second switches are turned on and off periodically corresponding to the input voltage. When the input voltage goes below a prescribed reference level, a first control signal that keeps the first switch constantly on is generated by a feedforward control circuit to turn on the third and fourth switches periodically corresponding to the output voltage so that the output time of the third switch is generated by a feedback control circuit to switch the voltage increasing operation and the voltage increasing/decreasing operation corresponding to the input voltage.

The invention discloses an LCD TV power system, comprising a relay and a standby circuit which are respectively connected with an AC input, a filter circuit connected with the relay, a rectifier circuit connected with the filter circuit, and a power factor corrector circuit connected with the rectifier circuit, wherein the relay is also connected with a low power consumption standby control circuit; and the power factor corrector circuit is also connected with a DC-DC transfer circuit and a DC-AC sine high voltage transfer circuit. The LCD TV power system in the invention can provide corresponding voltage and current for each system of the LCD TV, has ultra-low standby power consumption, high voltage conversion efficiency in normal work, relatively simple system and large power of unit volume output, and fully satisfies rigorous requirements of the LCD TV on power supply.

The invention belongs to the field of LED (Light Emitting Diode) control, and provides an LED control circuit and an LED illumination device. According to the invention, a switching tube, a capacitor C1, a sampling resistor R1, a voltage division sampling module, a diode D1, a phase sampling and retaining module, a current shaping module and a pulse generation module are adopted in the LED control circuit, wherein the pulse generation module controls the work state of the voltage division sampling module according to the output end voltage of the switching tube; and after the voltage division sample module and the current shaping module respectively perform alternating voltage in-phase sampling on output direct current of a rectifier bridge and sampling on input voltage of a first end of the inductance L1, the phase sampling and retaining module outputs a sampling and retaining voltage signal, and the current shaping module outputs a zero crossing comparison signal and a peak comparison signal to drive the drive pulse generation module to correspondingly output an impulse signal with a specific duty ratio to control the on-off state of the switching tube, so that the circuit is more miniaturized in structure and easy to integrate, the power factor is improved, and constant current driving of the LED load is realized.

The invention belongs to the field of constant current control, and provides a high-power-factor constant current control circuit. A zero-crossing comparison opening module is used for performing zero-crossing comparison on the voltage of a first end of a sampling resistor R1 and then correspondingly outputting a comparison level signal to drive a pulse signal generating module to control the turn-on of a switching tube; an error amplifying module performs error amplification on the voltage of the first end of the sampling resistor R1 and then correspondingly outputs an error amplification voltage; and a conduction time control module outputs a conduction control level signal according to the error amplification voltage and a feedback level signal output by the pulse signal generating module to drive the pulse signal generating module to control the turn-off of the switching tube, so that while the circuit is simplified, the power factor and the voltage conversion efficiency are improved, and high-power-factor and constant current output is realized in a wide input voltage range.

The invention provides an efficient and ultra-low-voltage integrated active full-wave rectifier. The efficient and ultra-low-voltage integrated active full-wave rectifier comprises a negative voltage converter and an active diode circuit, wherein the negative voltage converter is used for converting the sine-input negative half-wave current into the positive half-wave current; the active diode circuit is connected with the negative voltage converter and used for controlling the direction of the positive half-wave current. According to the scheme, the active full-wave rectifier has the advantages of being low in voltage and power consumption and high in efficiency, and the process deviation of the active full-wave rectifier has fewer influences on an output voltage value of the active full-wave rectifier.

The present invention is power supply managing method and device for connecting USB interface of computer and USB interface equipment, makes the USB interface power supply meet the requirements of powerful load capacity, small power supply ripple, capacity of providing instantaneous great current, etc. and makes USB interface equipment operate stable in high pulse current condition. The power supply managing method includes: 1. setting input voltage stabilizing and filtering module in the USB interface connecting end and connecting power supply to the USB interface for stabilizing voltage and filtering; 2. converting the output voltage into USB interface equipment needed operation voltage via DC/DC conversion; and 3. setting output voltage stabilizing and filtering module in the connect end of the USB interface equipment to provide the USB interface equipment with work voltage.

The invention provides a terminal device and a conversion circuit control method. The terminal device comprises a battery assembly, a charging circuit, a first conversion circuit, a second conversioncircuit, a controller and a system load; the controller is used for acquiring a current total voltage of the battery assembly; the battery assembly comprises at least two batteries connected in series; and the controller is further used for controlling one of the first conversion circuit and the second conversion circuit to start to work according to the current total voltage, wherein an output voltage of the first conversion circuit is a fixed value, and the voltage reduction rate of the second conversion circuit is a fixed value. According to the technical scheme, different conversion circuits can be selected according to the current total voltage of the battery assembly obtained in real time, so that the usability of the terminal device is improved.

A wide-range adjustable self-switching voltage source based on a BUCK circuit comprises a PWM control circuit, a high-speed optical coupling isolation circuit, a totem pole circuit, a BUCK main circuit. A PWM pulse signal is generated and output by a CPLD chip, and is subjected to input and output isolation by a high-speed optical coupler. Then the totem pole circuit provides a discharge loop forthe junction capacitance of a MOS transistor and increases the drive capability. Finally the BUCK main circuit forms a resonant loop switch structure, determines the level of a level signal to controlthe charge and discharge of the entire circuit the stable output of voltage, and finally outputs adjustable DC voltage. The wide-range adjustable self-switching voltage source based on a BUCK circuithas high reliability and good stability.

The invention provides an adjustable multi-output isolated voltage stabilizing power circuit which comprises an input overvoltage protection circuit, a reversal connection preventive protection circuit, a voltage control circuit, an energy conversion inductance assembly and a multipath output circuit in successive connection. The energy conversion inductance assembly comprises one group of primary inductance coils and multiple groups of secondary inductance coils, each group of secondary inductance coils corresponds to one path of output of the multipath output circuit, the voltage control circuit comprises a power device in which an oscillator is integrated and a voltage feedback circuit and a compensation circuit connected to the power device, and the power device is connected with the multipath output circuit via the voltage feedback circuit. The adjustable multi-output isolated voltage stabilizing power circuit is characterized by wide change range of input power, high voltage conversion efficiency, fewer peripheral devices, electrical isolation, multipath output and adjustable output voltage, is applied to electric control systems of certain diesel engines successfully, and has great reference values for other power circuits.

The invention discloses an input power supply type vibration energy obtaining interface circuit. A drain electrode of a PMOS switching tube is connected with the output end of a rectifying circuit. A source electrode of the PMOS switching tube is connected with an energy storage element and a load. A drain electrode of a PMOS diode is connected with a grid electrode of the PMOS diode and the energy storage element. A source electrode of the PMOS diode is connected with the output end of the rectifying circuit. The first input end of a comparator is connected with the drain electrode of the PMOS switching tube, the second input end of the comparator is connected with the source electrode of the PMOS switching tube, and the output end of the comparator is connected with a grid electrode of the PMOS switching tube. Due to the fact that the drain electrode and the grid electrode of the PMOS diode are connected, the PMOS diode is only switched on for a moment when second input signals pass through the PMOS diode, the energy storage element accumulates the second input signals at the moment, and a weak voltage difference is formed at the two ends of the PMOS switching tube; after the comparator detects the voltage difference, the PMOS switching tube is switched on, voltage conversion is carried out on the second input signals through the PMOS switching tube, and the second input signals reach the load. According to the input power supply type vibration energy obtaining interface circuit, voltage losses of the PMOS switching tube are reduced, and therefore the efficiency of voltage conversion carried out on the second input signals through the PMOS switching tube is improved.

The present invention relates to a voltage converting circuit of active-clamping zero voltage switch, consisting of a transformed unit, a primary-side input unit, a second-side output unit, and a first switch, wherein the primary-side input unit has a clamping capacitor and a second switch, which are used for avoid from the production of spike voltage on the first switch when the first switch is turned off, so as to increase the voltage conversion efficiency of the voltage converting circuit.

This semiconductor device includes a first regulator that stabilizes an input voltage to generate a stabilized voltage; a voltage boosting circuit that boosts the stabilized voltage to generate a boosted voltage; a second regulator that stabilizes the boosted voltage to generate a first power supply voltage; and a third regulator that is connected to the second regulator in parallel, and that stabilizes the boosted voltage to generate a second power supply voltage.

A flat panel active electronically scanned array (AESA) (1) includes heterogeneous integrated circuit DC-DC voltage converters (3) periodically placed on array elements (2). A heterogeneous integrated circuit (100, 400, 500, 600) includes a voltage converter (101) configured to receive an input voltage (V_I), and to convert the input voltage to an output voltage (V_O) that is different from the input voltage, the voltage converter (101) comprising an analog and/or digital PWM circuit (104). The heterogeneous integrated circuit (100, 400,500, 600) also includes a feedback circuit (103) configured to receive the output voltage (V_O), and to generate a control signal used to vary a pulse width of a PWM signal generated by the analog and/or digital PWM circuit (104). The digital PWM circuit (104) is implemented in a heterogeneous integrated circuit (100, 400, 500, 600) fabricated on a common substrate (606) using CMOS and GaN fabrication processes.

A voltage converter including a first transistor, a second transistor, an inductor and a control module is provided. The first transistor has a source terminal receiving an input signal, and a body terminal receiving a first bias voltage. The second transistor has a drain terminal coupled to a drain terminal of the first transistor, a source terminal coupled to ground, and a body terminal receiving a second bias voltage. The inductor has a first terminal coupled to the drain terminal of the first terminal and a second terminal generating an output voltage. The control module is coupled to a gate terminal of the first transistor and a gate terminal of the second transistor for controlling conducting states of the first transistor and the second transistor.

A batteryless digital TV receiver has a connector mounted on a body and complying with a specific standard, an RF receiving module, a digital TV processor, an authentication chip and a switching power conversion module. When the batteryless digital TV receiver is connected with a handheld device, the switching power conversion module acquires power outputted from the handheld device through the connector, limits an operating power under a specific current, supplies the operating power to the RF receiving module, the digital TV processor and the authentication chip. After the authentication chip and the handheld device finish an authentication step, the digital TV processor receives digital TV signals from the RF receiving module. The digital TV signals are decoded and transmitted to the handheld device and are displayed on the handheld device.

The invention discloses a handcart type high-voltage outgoing line cabinet. The cabinet comprises a cabinet body, and a handcart chamber is fixedly arranged at the bottom of the front surface in the cabinet body; a handcart fixing block is fixedly connected to the bottom of the inner back surface of the handcart chamber; the cabinet body is fixedly connected with a handcart through a handcart fixing block; the handcart comprises a handcart base, two sliding plates and two circuit breaker mounting boxes; the two sliding plates are slidably connected to the two sides of the top end of the handcart base correspondingly; the two circuit breaker mounting boxes are fixedly connected to the top ends of the two sliding plates respectively; the back surfaces of the handcart base are provided with connecting grooves, the top portion of the back surface of the cabinet is fixedly connected with a first maintenance cover through screws, the bottom portion of the back surface of the cabinet body isfixedly connected with a second maintenance cover through screws. According to the invention, by arranging the whole structure, the maintenance of the internal structure of the cabinet body is facilitated; and by arranging the handcart structure, the space is reasonably utilized to improve the voltage conversion efficiency, and the maintenance of the circuit breaker is facilitated.

The present invention enhances voltage conversion efficiency of a semiconductor device. In a non-isolated DC-DC converter that includes a high-side switch power MOSFET and a low-side switch power MOSFET, which are series-connected, the high-side switch power MOSFET and driver circuits for driving the high-side and low-side switch power MOSFETs are formed within one semiconductor chip, whereas the low-side switch power MOSFET is formed in another semiconductor chip. The two semiconductor chips are sealed in a single package.

A photo-coupler device includes a P-type substrate, a P-type epitaxial layer, an insulation layer, a plurality of shielding layers, a metal layer and a passivation layer. The P-type epitaxial layer is deposited on the P-type substrate and including two conducting regions and a plurality of N+ electrode regions between the two conducting regions. The insulation layer is deposited on the P-type epitaxial layer. The shielding layers are deposited in the insulation layer in a transverse juxtaposition manner, and the portion of the shielding layers is arranged for correspondingly covering the two conducting regions, another portion of the shielding layers is arranged for correspondingly covering the part of the N+ electrode regions. The metal layer is made of Ag and is deposited on the insulation layer. The passivation layer is deposited on the metal layer.