41results about How to "Increase conduction angle" patented technology

The embodiment of the invention provides a draught fan PG motor control method, a draught fan and an air conditioner and relates to the field of air conditioners. The rotating speed of an air conditioner draught fan motor can be controlled accurately. The method comprises the steps of acquiring the actual rotating speed of the PG motor within a first preset time duration; matching the acquired actual rotating speed with a preset target rotating speed and reducing the conduction angle of the PG motor when the actual rotating speed is greater than the preset target rotating speed; increasing the conduction angle of the PG motor when the actual rotating speed is less than the preset target rotating speed; and keeping the conduction angle of the PG motor unchanged when the actual rotating speed is equal to the preset target rotating speed. The draught fan PG motor control method is used for conducting control over the air conditioner draught fan.

The invention relates to a lighting device. The lightning device comprises a rectification unit connected with a power supply, at least a lightning unit connected with the rectification unit through a buck circuit unit, and a buck circuit unit connected with the rectification unit and the lighting unit. The lighting device also comprises a main control unit connected with the buck circuit unit and the lighting unit. The main control unit is arranged to control the input current from the rectification unit to flow past a light emitting part of the lighting unit according to change of the input voltage of the rectification unit, and thus a total forward voltage of the light emitting part is adjusted. When the input voltage is more than the total forward voltage, the buck circuit unit lowers the voltage flowing past the lighting unit and thus the lighting device enters a voltage reduction state.

There is disclosed a passive power-factor correcting circuit for the electronic ballast, which includes BOOST circuit consisting of an inductor, a capacitor and a diode, and a current-follower circuit consisting of two electrolytic capacitors and four diodes. The BOOST circuit is series connected between the mains output circuit of the electronic ballast and the lead-in end of the filament. The current-follower circuit is parallel connected at the front end of DC/AC translation circuit of the electronic ballast.

A power supply device used for an elevator brake coil disclosed by the present invention comprises a time delay control circuit, an AC buck circuit and a bridge rectifier circuit B1, the time delay control circuit outputs a first control signal and a second control signal respectively when an elevator is started and the time delay time is ended, and the AC buck circuit comprises a relay K1, a capacitor C1, a resistor R0, a resistor R3, a bidirectional diode D1 and a bidirectional silicon controlled rectifier Q1. A live wire of the commercial power is connected with the first terminal of the bidirectional silicon controlled rectifier Q1, and the control end of the bidirectional silicon controlled rectifier Q1 is in series connection with the bidirectional diode D1 and then is connected with a normally-closed contact 4 of the relay K1. The capacitor C1 and the resistor R3 are connected in series and then are in parallel connection between the first terminal of the bidirectional silicon controlled rectifier Q1 and the normally-closed contact 4, and the second terminal of the bidirectional silicon controlled rectifier Q1 is connected with a common contact 6 of the relay K1. The resistor R0 is in parallel connection between the second terminal of the bidirectional silicon controlled rectifier Q1 and the normally-closed contact 4, and the normally-closed contact 4 of the relay K1 is closed and disconnected respectively according to the first and second control signals. Compared with the prior art, the power supply device used for the elevator brake coil of the present invention is simple and reliable in realization mode and low in cost, and realizes the high and low voltage isolation.

The invention relates to a power factor compensating device. A BOOST circuit is adopted. The power factor compensating device is characterized in that the BOOST circuit comprises a soft switching circulation module, a parallel interleaving module, a magnetic integration module, a current feedback detecting module and a voltage feedback detecting module. The power factor compensating device is simple in structure and improves the conduction angle of switch power supply input currents, thereby improving the power factor, reducing current harmonic waves, reducing pollution to a power grid, and improving the use ratio of electricity generator power.

A method of operating a power controller that converts a line voltage to an RMS load voltage includes a soft start in which a conduction angle of a phase-control clipping circuit is gradually increased to a steady state value that defines the RMS load voltage. The controller has a circuit with a time-based signal source that triggers conduction independently of line voltage magnitude and a transistor switch whose gate receives signals from the time-based signal source to trigger the circuit. When starting the power controller, a microcontroller increases the conduction angle of the phase-control clipping circuit in plural steps to provide the soft start.

The invention belongs to the field of wearable equipment energy supply, and particularly discloses an energy acquisition circuit for wearable equipment and a power management circuit thereof. An auxiliary charge pump is introduced into each stage of charge pump in the energy acquisition circuit; the auxiliary charge pump adopts a charge transmission switch structure and is used for generating threshold compensation voltage based on electromagnetic waves and controlling grids provided for main rectification switches in the main rectification charge pump through a clamping tube so as to reduce the threshold voltage of the main rectification charge pump; the power supply management circuit comprises a sub-threshold bias generation circuit which is used for starting and generating reference voltage VREF irrelevant to VCC and environment temperature based on VCC. The LDO circuit based on the sub-threshold amplifier performs filtering of ripple waves for VCC based on VREF in a sub-thresholdstate, and secondary power supply voltage VDD is obtained. The circuit is high in energy conversion efficiency, low in manufacturing cost, suitable for various electromagnetic wave energy environmentsand high in practicability.

The disclosed intelligent remote control lamp holder comprises: a receive lamp holder with a control circuit board of MCU2 connected with a wireless receive demodulation unit with antenna, a power reduce-voltage commutation stabilize-voltage unit to supply power, a control output drive unit with a power output control unit connected to control output electrode on holder connector, and a power detection unit; and a wireless remote controller. Wherein, the input electrode of firing line connects with said power reduce-voltage commutation stabilize-voltage unit and power output control unit, while zero line electrode connects with power reduce-voltage commutation stabilize-voltage unit and power detect unit and zero line electrode of holder connector.

The invention relates to the technical field of rectifying circuits and capacitor filtering circuits in alternating current and direct current conversion, in particular to a circuit capable of increasing the conduction angle of a bridge rectifier. The circuit comprises a first rectifying circuit body and a second rectifying circuit body and is characterized in that a regulator circuit body is arranged between the first rectifying circuit body and the second rectifying circuit body, and the regulator circuit body is electrically connected with the first rectifying circuit body and the second rectifying circuit body respectively. According to the circuit, the regulator circuit body is additionally arranged between the two rectifying circuit bodies which are originally independent so as to prolong the conduction time of diodes in the corresponding original rectifying circuit bodies to increase the conduction angle and reduce impact currents, and therefore the service life of the diodes is prolonged. The circuit capable of increasing the conduction angle of the bridge rectifier prolongs the conduction time of diodes in the capacitor filtering circuits, and increases the conduction angle, thereby prolonging the service life of the diodes.

The invention relates to the field of switching power supplies, and discloses a switching power supply and a valley fill circuit wherein the switching power supply comprises a first energy storage unit, a second energy storage unit, a first diode, a second diode, a third diode, a first switch, a second switch, a first winding and a second winding. The switching power supply can be applied to the field of switching power supplies with wide voltage input, when the input voltage is low-voltage input, the first switch and the second switch are controlled to be switched on, and when the input voltage is high-voltage input, the first switch and the second switch are controlled to be switched off. When the energy storage unit is a capacitor, the switching power supply can provide appropriate filtering capacity for input voltages in different ranges, can improve the PF value during high-voltage input, solves the problems of large output voltage fluctuation and impact current of a large capacitor during low-voltage input, and reduces the size of a system and the cost at the same time.

The invention relates to a three-phase switched reluctance motor system based on a quasi-Z-source modular converter. A quasi-Z-source modular converter of the system is composed of a front-end quasi-Z-source circuit and four groups of power conversion units connected in parallel, and a phase stator winding of a three-phase switched reluctance motor is connected among the four groups of power conversion units; the converter can realize four operation modes, namely a direct-through mode, a non-direct-through excitation mode, a non-direct-through zero-voltage follow current mode and a non-direct-through demagnetization mode. The bus voltage can be adjusted by changing the direct-through duty ratio of the quasi-Z-source modular converter, the change range of the DC bus voltage is greatly expanded, and thus the wide-range speed regulation of the motor can be realized. And meanwhile, the bus voltage is increased, so that the excitation and demagnetization processes can be accelerated, and the torque pulsation is reduced. The three-phase switched reluctance motor system is high in integration level, high in power density, high in reliability and adjustable in DC bus voltage.

The invention discloses a multipath LED driving circuit model of a high power factor. The model comprises a rectifier bridge, n LED strings in serial connection, n power switch tubes, a switch tube driving circuit module, a first resistor, a second resistor and a sampling resistor; the anode of the first LED string is connected with one output end of the rectifier bridge and one end of the second resistor; the cathode of the nth LED string is connected with a sampling voltage port of the switch tube driving circuit module and one end of the sampling resistor; the other end of the sampling resistor is grounded; a reference voltage port of the switch tube driving circuit module is connected with one end of the first resistor and the other end of the second resistor; the other end of the first resistor is grounded; and grid electrodes of the n power switch tubes are connected with n output ports of the power tube driving circuit module respectively, drain electrodes of the n power switch tubes are connected with cathodes of n LED strings, and each of source electrodes of the n power switch tubes is connected with the sampling voltage port of the switch tube driving circuit module and one end of the sampling resistor. Thus, the total harmonic distortion is low, the power factor is high, and the amount of circuit components is reduced.

The invention discloses an LED drive circuit, an LED constant current driver and lighting equipment. The LED drive circuit comprises a rectifier module, an energy storage filter capacitor, a sampling module, a control module and a ripple elimination module. The rectifier module is used for rectifying input voltage; the sampling module is used for sampling the voltage output by the rectification module so as to output a feedback signal to the control module; the energy storage filter capacitor and the control module are connected in series between the rectifier module and the ground, and are used for charging and storing energy within the input current conduction time and providing driving current for the LED lamp group within the input current disconnection time; the control module is electrically connected with the sampling module, and is used for controlling the current of the LED lamp group according to the feedback signal and a current signal on a first sampling resistor in the control module, and controlling the conduction time and the charging current of the energy storage filter capacitor; the ripple elimination module is connected in series with the LED lamp group and then connected in parallel with the energy storage filter capacitor, and is used for controlling the current of the LED lamp group and eliminating the ripple current.