7 results about "Active power factor correction" patented technology

The present disclosure provides a variable frequency drive with active power factor correction circuit topology to facilitate unity power factor and non-positive DC bias on the output voltage. The topology is an improvement over the traditional boost power factor correction circuit consisting of a bridge rectifier, a plurality of inductors, a plurality of power semiconductor transistor switches, a plurality of boost diodes, a bus capacitor bank and a controller. In certain embodiments, the active power factor correction circuit feeds an inverter circuit that drives a motor.

The application discloses a direct current charging device and a control method for a thermal power unit, which comprises a first filter module, an active power factor correction module and a power supply conversion module, wherein the power supply conversion module comprises a plurality of parallelly connected power modules, each of the power modules comprises a power conversion unit, a control loop unit, a redundant control unit, a current sharing control unit and a detection feedback unit, the first filter module is electrically connected with an alternating current power supply and the active power factor correction module respectively, and the active power factor correction module is electrically connected with each power conversion unit; in each power module, the power conversion unit is electrically connected with the control loop unit and the redundant control unit respectively, the redundant control unit is electrically connected with the detection feedback unit and a previous adjacent power module respectively, the current sharing control unit is electrically connected with the control loop unit and the detection feedback unit respectively, and the detection feedback unit is electrically connected with a storage battery. The application improves the power factor and reduces the harmonic pollution of the power grid.

The present disclosure provides a non-isolated buck Active Power Factor Correction (APFC) circuit (100) including an integrated monolithic Application-Specific Integrated Circuit (ASIC) (110) for controlling and driving the non-isolated buck APFC circuit and a motor controller and driver circuit. The APFC circuit (100) includes a bridge rectifier (102), an Electromagnetic Interference (EMI) filter (104), and a non-isolated buck APFC power converter (106) configured to convert a high voltage DC to a low voltage DC, using one or more switching components, to achieve an active power factor correction. The APFC circuit (100) includes a motor controller and driver circuit (108) configured to generate Pulse Width Modulation (PWM) pulses to drive windings of a motor (M1) for controlling a speed of the motor (M1). The non-isolated buck APFC power converter (106) and the motor controller and driver circuit (108) are configured to share common ground.

Provided are a method for controlling a full bus load to discharge in a household electrical appliance and related apparatuses. In the method, in response to determining that a half bus load is turned on and a full bus load is turned off, a voltage difference between a first DC power and a second DC power is determined to obtain a voltage difference. The first DC power and the second DC power are obtained by converting three-phase power through a three-level active PFC unit. Subsequent to the voltage difference between the first DC power and the second DC power being determined, a full bus load is controlled to be turned on or off based on the voltage difference to stabilize a half bus voltage in a predetermined voltage interval.

This application discloses an electronic control board, an outdoor air conditioning unit, and an air conditioner, belonging to the field of household appliance technology. The electronic control board is divided into a first installation area, a second installation area, a third installation area, and a fourth installation area, and the main control chip circuit, active power factor correction control circuit, frequency converter control circuit, power input circuit, and functional interface circuit are installed in different installation areas respectively. Due to the partitioned installation and the main control chip circuit being installed on one side of the substrate, i.e., near the edge of the substrate, the passive components are arranged around the control chip or concentrated on one side of the control chip, making it easier to dissipate the heat generated by the control chip, reducing heat interference between the control chip and other components in the installation area, which is beneficial to improving heat dissipation efficiency and enabling the electronic control board to adapt to higher frequency and performance control requirements.