82results about How to "Input voltage is stable" patented technology

The invention provides a PFC (power factor correction) control method with high input power factor and a control circuit thereof. The method comprises the steps of controlling a switching tube to be switched on and switched off according to the principle of leading impulse area to be equivalent, and leading input inductive current and sinusoidal half-wave current to have the equivalent impulse area in each switching period, thereby realizing the high power factor (PF); furthermore, the higher the switching frequency, the closer to 1 the PF value is. In the control circuit, a circuit topological structure of a Boost converter and a control circuit for realizing a variable duty ratio sequence jointly constitute a PFC stage of a commonly used LED (light-emitting diode) driving power supply, the front stage of the PFC stage is connected with the output end of a non-controllable rectifier bridge of a single-phase diode via an input filter capacitor, the back stage of the PFC stage is connected with a DC/DC (direct current/direct current) stage of the commonly used LED driving power supply via an output filter inductor and an output filter capacitor. By adopting the PFC control method, not only the very high input power factor can be realized, but also output voltage ripple can be reduced; furthermore, the control circuit is simple and easy to realize an analog circuit, thereby being conductive to large-scale integration.

The invention relates to a high frequency pulse power supply for electric dedusting. A three-phase alternating-current power supply is supplied to a deduster electric field after passing through the high frequency pulse power supply for electric dedusting. The high frequency pulse power supply for electric dedusting includes a main loop switch, a pulse power generator, a high frequency fundamental wave circuit, a DSP controller, a detection circuit, and a coupling circuit. The pulse power generator and the high frequency fundamental wave circuit are connected between the main loop switch and the coupling circuit in parallel.

The invention discloses a voltage conversion circuit, which comprises a first-order charge pump, a negative feedback loop, an oscillator biasing circuit and an annular oscillator, wherein the first-order charge pump is used for forming an output voltage to be output from an output end, and providing the voltage for a load; the negative feedback loop is used for forming a feedback voltage to be output to an input end of the first-order charge pump; the oscillator biasing circuit is used for providing a biasing voltage for the annular oscillator; and the annular oscillator is used for outputting a clock signal under the control of the feedback voltage. The voltage conversion circuit controls the input voltage of the first-order charge pump and amplitude of the clock signal through the negative feedback loop, transmits the voltage at the input end of the first-order charge pump to the output end so as to form a stable output voltage, adjusting frequency of a clock control signal of the first-order charge pump through the annular oscillator according to load current condition, and reduces power consumption of the system under the condition of guaranteeing that the stable target voltage is output.

The invention provides a consumable chip and a consumable container; a signal exchange circuit to carry out signal exchanging with the outside is arranged on a consumable chip substrate; a parasitic power circuit of electricity is acquired from the signal exchange circuit; a signal decoding circuit is decoded from the signal exchange circuit; the consumable chip also comprises a voltage stabilizing circuit between the signal exchange circuit and the parasitic power circuit; the voltage stabilizing circuit is provided with a voltage stabilizing diode; voltage pre-stabilizing is performed by making use of the characteristic that before inverse voltage of the voltage stabilizing diode is not broken down, voltages of the two ends of the voltage stabilizing diode are kept unchanged. The invention also provides a consumable container with the consumable chip. The consumable chip provided herein can effectively avoid influence upon input voltage of the parasitic power circuit during signal modulation, so that the sensitivity of the demodulating circuit is higher.

The present invention provides a charge pump circuit which is suitable to be used in a display panel. The charge pump circuit comprises a plurality of switches and a switch controlling circuit. First of all, the transition states of a plurality of switches are defined: the state switching from non-conducting state to conducting state is called an enabling transition, and the state switching from conducting state to non-conducting state is called a forbidding transition. The switch controlling circuit is coupled to a plurality of switches and is used for the conducting and non-conducting of a plurality of switches, and further the charge pump circuit is leaded to provide an output voltage different from the input voltage. The switch controlling circuit leads to that the time necessary for the enabling transition of a plurality of switches is longer than the time necessary for the forbidding time, wherein, when a plurality of switches are in the enabling transition, the equivalent impedances of a plurality of switches changes from big to small.

A method for quickly regulating battery current belongs to the field of high-voltage DC power supplies and includes sending a voltage regulation instruction to a voltage regulation management module according to real-time output current of a battery pack sampled by monitor terminal and real-time output voltage of charging module, regulating the voltage of the battery pack by the voltage regulationmanagement module according to voltage regulation instruction ; enabling the battery pack to feed back the battery pack performance and current information to the PID controller; enabling The PID controller to adjust the PID control parameters according to the performance of the battery pack and feed back the regulated voltage difference to the voltage regulating management module; and If the regulated voltage difference is not zero, enabling the voltage regulation management module to continue to regulate the voltage. The voltage regulating management module regulates the voltage of the battery pack after receiving the voltage regulating instruction sent by the monitoring terminal, The output of PID controller is more stable by adjusting PID control parameters according to the performance of battery pack, which avoids the large current oscillation of battery pack, improves the utilization rate of battery pack and prolongs the life of battery pack.

The invention discloses an electricity consumption information acquisition system, which belongs to the technical field of data acquisition. The electricity consumption information acquisition system comprises a main station, an electricity meter and an optical fiber acquisition unit, wherein the optical fiber acquisition unit comprises a micro control unit, at least two RS485 circuits, an optical communication circuit, a storage chip and a power supply module. According to the electricity consumption information acquisition system, the optical fiber acquisition unit is uplinked to the main station by virtue of a high-speed optical fiber transmission method and can carry mass data transmission and enable a communication link to be more stable, the optical fiber acquisition unit is downlinked to the electricity meter to increase multiple circuits of RS485 buses, the multiple circuits of RS485 buses are independent of each other and are operated in parallel without interfering with one another, the modification of an uplink transmission channel and a downlink transmission channel enables the electricity consumption data acquisition capability to be greatly improved, and the high-frequency and high-precision requirement on acquiring the electric power data at present can be met.

The invention discloses a display screen driving chip, a display screen driving circuit and a display screen driving method. The display screen driving chip comprises a signal transmission module, a voltage control module, a driving voltage generation module and a constant current driving module; the signal transmission module accesses a display control signal, and performs first decoding processing, serial-to-parallel conversion and second decoding processing on the display control signal to obtain a display driving signal and a display configuration signal; the voltage control module generates a voltage driving signal according to the display driving signal; the driving voltage generation module adjusts the input voltage of the light-emitting module according to the voltage driving signal; the constant-current driving module performs constant-current control on the light-emitting module according to the display configuration signal. The display screen driving chip can flexibly adjustthe input electric energy according to the power requirement of the light emitting module, so that the light emitting module is in a rated operation state, the flexibility is high, the light source display quality and the driving stability of the light emitting module are guaranteed, and the energy-saving effect is achieved.

The invention discloses a power device and a power feedback circuit thereof. The circuit comprises a first voltage feedback end and a second voltage feedback end that are used for correspondingly connecting with a positive feedback pin and a negative feedback pin in a power connection port of the power device, a first comparison unit used for outputting a first comparison signal according to a voltage fed back by the second voltage feedback end and a first reference voltage provided by a first reference voltage providing unit, so as to control on and off of a second switch transistor, a secondcomparison unit used for outputting a second comparison signal according to a voltage fed back by the first voltage feedback end and a second reference voltage provided by a second reference voltageproviding unit, so as to control on and off of a first switch transistor, and a differential amplification unit used for outputting a feedback voltage to a voltage adjustment unit of the power deviceaccording to on and off states of the first switch transistor and the second switch transistor, wherein the voltage adjustment unit adjusts an output voltage according to the feedback voltage, so as to enable the output voltage of the power connection port to meet the requirement of a load end device.

The invention discloses an input voltage control method, which comprises a power supply, a first rectifying circuit and a second rectifying circuit, the first rectifying circuit and the second rectifying circuit are connected in parallel between the positive electrode and the negative electrode of the power supply and rectify the power supply, the output end of the first rectifying circuit is connected to a motor through a driving circuit, and the output end of the second rectifying circuit is connected to a controller through a voltage detection circuit. The controller collects a bus voltage value U real and a bus current value, stores a target duty ratio value D target and a target voltage value U target, determines the corresponding target voltage value U target according to the collected bus current value, and obtains an output control duty ratio D real to drive the motor according to a formula: D real = (U target * D target)/U real. By collecting the output voltage of the second rectifying circuit, the waveform is stable, the control effect is good, the duty ratio is changed according to the bus voltage, and stable operation of the motor is improved.

The invention relates to a multi-module-series-circuit-based module self-power-taking and protection circuit comprising a capacitor C1, a diode D1, a diode D2, and a capacitor C2. The diode D2 is connected in series with the capacitor C2 to form a module self-power-taking circuit; a cathode of the diode D2 is connected with a positive potential point C2+ of the capacitor C2; the capacitor C1 is connected in parallel to the diode D1; and a cathode of the diode D1 is connected with an anode of the diode D2, a positive potential point C1+ of the capacitor C1, and a positive potential point V+ ofa module. A negative potential point C1- of the capacitor C1 is connected to an anode of the diode D1, a negative potential point C2 of the capacitor C2, and a negative potential point V- of the module; a positive potential point Q+ of a non-controlled bridge/controllable bridge circuit direct-current side is connected with the positive potential point V+ of the module; a negative potential pointQ- of the non-controlled bridge/controllable bridge circuit direct-current side is connected with the negative potential point V- of the module; a positive potential point C2+ of the capacitor C2 is connected with a positive potential point V+ of a power-taking power supply; and a negative potential point C2- of the capacitor C2 is connected with a negative potential point - of the power-taking power supply.

The invention provides a low dropout regulator (LDO) and a voltage stabilization method. The LDO comprises a voltage compensation circuit and a voltage stabilization circuit, and the output end of thevoltage stabilization circuit is connected with external equipment through a circuit board connecting wire; the voltage compensation circuit is used for determining the loss voltage of the circuit board connecting wire and compensating for first reference voltage according to the loss voltage to obtain second reference voltage; the voltage stabilization circuit is used for adjusting the output voltage of the LDO according to the second reference voltage. In the embodiment of the LDO, no matter how a working current of the external equipment changes, in other words, no matter how a load current of the LDO changes, stable input voltage can be obtained at the input end of the external equipment, and accordingly it is ensured that a power supply system is stable and reliable.

A power conversion device and an electronic device comprising the same. The power conversion device comprises an input terminal configured to connect with a power source and receive an input voltage; an output terminal configured to connect with a load and provide an output voltage for the load; a first power conversion unit configured to convert the input voltage into the output voltage and stabilize the output voltage; a second power conversion unit configured to convert the input voltage into the output voltage and stabilize the output voltage, the second power conversion unit having a higher power conversion efficiency than the first power conversion unit when an output current provided for the load is higher than a first threshold value; and a power conversion unit selection unit configured to detect parameters corresponding to the output current and select the first power conversion unit and the second power conversion unit based on the parameters corresponding to the output current.

The invention discloses a hybrid electric vehicle and a power system thereof. The power system includes an engine, a power motor, a power battery, a DC-DC converter, an auxiliary motor and a voltage regulator circuit. The engine outputs power to wheels of the hybrid electric vehicle through a clutch. The power motor outputs driving force to the wheels of the hybrid electric vehicle. The power battery supplies power for the power motor. The auxiliary motor is connected to the engine, the power motor, the DC-DC converter and the power battery separately. The voltage regulator circuit is connected between the auxiliary motor and the DC-DC converter, and the direct current outputted to the DC-DC converter during power generation of the auxiliary motor is subjected to voltage regulating treatment by the voltage regulator circuit, the low-speed electric balance and low-speed smoothness of the whole vehicle can be maintained, and the input voltage of the DC-DC converter can be stabilized to ensure that the DC-DC converter works normally.

The invention relates to an automatic shutdown circuit of a single chip microcomputer. The circuit comprises an NPN triode and a PNP triode. A collector electrode of the PNP triode is connected to a power supply of the single chip microcomputer, an emitting electrode of the PNP triode is connected to a 4.5V direct current power supply and connected to a collector electrode of the NPN triode through a base electrode, a base electrode of the NPN triode is connected to a control pin of the single chip microcomputer, and an emitting electrode of the NPN triode is grounded. According to the automatic cut-off circuit of the single chip microcomputer, the single chip microcomputer can completely shut off power by itself and cannot restart automatically during shutdown, and therefore the power consumption of the single chip microcomputer is effectively saved.

The invention discloses a control system and method of an electric compressor of a new energy automobile. The control system comprises an inverse variation module, an energy conversion module, a voltage distributing module, compressor drivers, a brake energy recovering device and a main controller. The input end of the inverse variation module is connected with the output end of a battery pack, the input end of the energy conversion module is connected with the output end of the inverse variation module, and the voltage distributing module is connected to the output end of the energy conversion module and comprises at least two capacitors arranged in a series-connection mode, wherein one capacitor is adjustable, and the adjustable capacitor is provided with a capacitance value adjusting mechanism. The compressor drivers are arranged at the two ends of the adjustable capacitor, the input end of the brake energy recovering device is connected with the stator end of a car driving motor, and the main controller is connected with the capacitance value adjusting mechanism, a compressor controller and the control end of the driving motor, and the two ends of the battery pack are further provided with staggered voltage-increasing circuits. According to the control system and method of the electric compressor of the new energy automobile, the technical problem that operation of a compressor is instable is solved.

The invention relates to an amplitude modulation type energy storage and frequency conversion circuit, comprising a voltage source, a periodic circuit, a fluorescent lamp circuit and a stabilizing circuit; wherein, the input terminal of the voltage source is connected with a dimmer, the output terminal thereof is connected with a bridge rectifier; the periodic circuit is provided with two transistors Q1 and Q2 and a group of self-induction coils connected in series; the fluorescent lamp circuit is provided with a protection circuit and a fluorescent tube; the stabilizing circuit consists of two capacitors C1 and C2 that are connected in series and between which a diode D1 is arranged; furthermore, the capacitors C1 and C2 provide a compensation voltage for the load after being charged. By the structure, the dimmer can be directly arranged on any terminal of the input voltage source, thus reducing the wiring difficulty and material cost; besides, the dimmer generates no flickers while adjusting the brightness of the fluorescent lamp.