Abstract: A switching mode power supply (SMPS) circuit is disclosed herein which includes: a first input rectification circuit, a first capacitor, a feedback control and driving circuit, and at least one boost circuit. The first input rectification circuit rectifies an input voltage and charges the first capacitor, forming a first loop. The second input rectification circuit rectifies the input voltage and charges the second capacitor, forming a second loop. The first inductor, second capacitor and first switching component form a third loop in which rectified voltage on the second capacitor charges the first inductor. The first inductor, second capacitor, first capacitor and first output rectification circuit form a fourth loop in which induced voltage on the first inductor and voltage on the second capacitor are superimposed to charge the first capacitor through the first output rectification circuit.

Abstract: A PFWM control system for a switching-mode power supply (SMPS) circuit including a boost conversion circuit and a DC-DC converter. The PFWM control system includes a duty cycle control unit, a frequency control unit and a PFWM waveform generator module. The duty cycle control unit samples an output voltage or current or power of the DC-DC converter, and calculates a duty cycle of a switching component of the SMPS. The frequency control unit samples an input or output voltage of the boost conversion circuit, and calculates an operation frequency of the switching component. The PFWM waveform generator module synthesizes a PFWM drive signal according to the duty cycle and operation frequency. The PFWM drive signal drives switching component of the boost conversion circuit and the DC-DC converter, so as to control an output voltage, an output current, or an output power provided to a load by the DC-DC converter.

Abstract: A SMPS circuit for three-phase AC input includes: a first input rectification circuit, a first capacitor, a feedback control and driving circuit, and multiple boost converter circuits. The first input rectification circuit rectifies input voltage and charges the first capacitor, forming a first loop. In each boost converter circuit, a second input rectification circuit rectifies input voltage and charges a second capacitor, forming a second loop; a first inductor, the second capacitor and a first switching component form a third loop in which rectified voltage on the second capacitor charges the first inductor. The first inductor, second capacitor, first capacitor and first output rectification circuit form a fourth loop in which induced voltage on first inductor and voltage on second capacitor are superimposed to charge first capacitor through the first output rectification circuit. The SMPS circuit provides high efficiency, high reliability, low EMI noise and good inrush inhibition capability.

Abstract: A switching-mode power supply circuit includes a boost inductor, a boost capacitor, a storage capacitor, a transformer or DC-DC inductor, a first switching component, an output rectification component, a filter capacitor, a feedback and control circuit, first and second rectification circuits. When first switching component conducts, the boost inductor, boost capacitor and first switching component form a first boost loop, the boost inductor stores energy, and the storage capacitor, first switching component and transformer or DC-DC inductor form a first DC-DC loop. When first switching component cuts off, the boost inductor, boost capacitor, storage capacitor and transformer or DC-DC inductor form a second boost loop, and the transformer or DC-DC inductor, output rectification component and filter capacitor form a second DC-DC loop. The filter capacitor supplies energy to a load.

Abstract: A switching mode power supply (SMPS) circuit is disclosed herein which includes: a first input rectification circuit, a first capacitor, a feedback control and driving circuit, and at least one boost circuit. The first input rectification circuit rectifies an input voltage and charges the first capacitor, forming a first loop. The second input rectification circuit rectifies the input voltage and charges the second capacitor, forming a second loop. The first inductor, second capacitor and first switching component form a third loop in which rectified voltage on the second capacitor charges the first inductor. The first inductor, second capacitor, first capacitor and first output rectification circuit form a fourth loop in which induced voltage on the first inductor and voltage on the second capacitor are superimposed to charge the first capacitor through the first output rectification circuit.

Abstract: A SMPS circuit for three-phase AC input includes: a first input rectification circuit, a first capacitor, a feedback control and driving circuit, and multiple boost converter circuits. The first input rectification circuit rectifies input voltage and charges the first capacitor, forming a first loop. In each boost converter circuit, a second input rectification circuit rectifies input voltage and charges a second capacitor, forming a second loop; a first inductor, the second capacitor and a first switching component form a third loop in which rectified voltage on the second capacitor charges the first inductor. The first inductor, second capacitor, first capacitor and first output rectification circuit form a fourth loop in which induced voltage on first inductor and voltage on second capacitor are superimposed to charge first capacitor through the first output rectification circuit. The SMPS circuit provides high efficiency, high reliability, low EMI noise and good inrush inhibition capability.

Abstract: A switching-mode power supply circuit includes a boost inductor, a boost capacitor, a storage capacitor, a transformer or DC-DC inductor, a first switching component, an output rectification component, a filter capacitor, a feedback and control circuit, first and second rectification circuits. When first switching component conducts, the boost inductor, boost capacitor and first switching component form a first boost loop, the boost inductor stores energy, and the storage capacitor, first switching component and transformer or DC-DC inductor form a first DC-DC loop. When first switching component cuts off, the boost inductor, boost capacitor, storage capacitor and transformer or DC-DC inductor form a second boost loop, and the transformer or DC-DC inductor, output rectification component and filter capacitor form a second DC-DC loop. The filter capacitor supplies energy to a load.

Abstract: A PFWM control system for a switching-mode power supply (SMPS) circuit including a boost conversion circuit and a DC-DC converter. The PFWM control system includes a duty cycle control unit, a frequency control unit and a PFWM waveform generator module. The duty cycle control unit samples an output voltage or current or power of the DC-DC converter, and calculates a duty cycle of a switching component of the SMPS. The frequency control unit samples an input or output voltage of the boost conversion circuit, and calculates an operation frequency of the switching component. The PFWM waveform generator module synthesizes a PFWM drive signal according to the duty cycle and operation frequency. The PFWM drive signal drives switching component of the boost conversion circuit and the DC-DC converter, so as to control an output voltage, an output current, or an output power provided to a load by the DC-DC converter.

Abstract: A PFWM control method for a combination power supply of the boost converter and the bridge type DC-DC converter which also includes BUCK. A method of using the PFWM to control both boost and DC-DC converters simultaneously. A monitor module senses the bridge type DC-DC converter's output voltage, current or power, to obtain the frequency of PFM for driving switching components; predetermined a duty by design and use a frequency to adjust the boost output so as to adjust the DC-DC output voltage, current or power. Another monitor module senses the input instant voltage and the boost output voltage to obtain a maximum duty which is used to prevent the boost inductor from saturation. Combine above frequency and duty into at least a pair of complement PFWM driving signals, to directly or indirectly drive the combination power supply of boost converter and bridge type DC-DC converter's switching components.

Abstract: An AC-DC converter with a dual-rectification full bridge interleaved single stage PFC circuit and its control method are disclosed. The converter uses two switching components of a full bridge converter to alternately drive two boost inductors, which eliminates the use of two boost switching components and two boost rectifiers required in a conventional interleaved boost PFC circuit, and also saves individual PWM PFC control circuit.

Abstract: A dual-rectification bridge type single stage PFC converter circuit includes a boost circuit working together with a bridge type DC-DC converter. The bridge type DC-DC converter may include low side and high side switching components like BUCK, half bridge, full bridge, etc. This PFC converter circuit drives the boost inductor of the boost circuit by using the switching components of the bridge type DC-DC converter, which eliminates the use of boost switching components and boost rectifiers in conventional boost PFC circuits, also eliminates the use of individual PWM PFC control units.

Abstract: A PFWM control method for a combination power supply of boost converter and bridge type DC-DC converter is disclosed. The bridge type DC-DC converter may include half bridge, full bridge or BUCK. The method includes simultaneously controlling the boost and DC-DC converters by using PFWM. In one aspect, the bridge type DC-DC output voltage or current or power is sensed to obtain duty of PWM for driving switching components. The duty is used to adjust DC-DC output voltage or current or power. In the other aspect, the boost converter's operating parameter is sensed to obtain a frequency of PFM for driving switching components. The frequency is used to adjust boost output voltage. The above frequency and duty are combined into at least a pair of complementary PFWM driving signals, to directly or indirectly drive switching components of the combination power supply of boost converter and bridge type DC-DC converter.

Abstract: A PFWM control method for a combination power supply of boost converter and bridge type DC-DC converter is disclosed. The bridge type DC-DC converter may include half bridge, full bridge or BUCK. The method includes simultaneously controlling the boost and DC-DC converters by using PFWM. In one aspect, the bridge type DC-DC output voltage or current or power is sensed to obtain duty of PWM for driving switching components. The duty is used to adjust DC-DC output voltage or current or power. In the other aspect, the boost converter's operating parameter is sensed to obtain a frequency of PFM for driving switching components. The frequency is used to adjust boost output voltage. The above frequency and duty are combined into at least a pair of complementary PFWM driving signals, to directly or indirectly drive switching components of the combination power supply of boost converter and bridge type DC-DC converter.

Abstract: A PFWM control method for a combination power supply of the boost converter and the bridge type DC-DC converter which also includes BUCK. A method of using the PFWM to control both boost and DC-DC converters simultaneously. A monitor module senses the bridge type DC-DC converter's output voltage, current or power, to obtain the frequency of PFM for driving switching components; predetermined a duty by design and use a frequency to adjust the boost output so as to adjust the DC-DC output voltage, current or power. Another monitor module senses the input instant voltage and the boost output voltage to obtain a maximum duty which is used to prevent the boost inductor from saturation. Combine above frequency and duty into at least a pair of complement PFWM driving signals, to directly or indirectly drive the combination power supply of boost converter and bridge type DC-DC converter's switching components.

Abstract: A dual-rectification bridge type single stage PFC converter circuit includes a boost circuit working together with a bridge type DC-DC converter. The bridge type DC-DC converter may include low side and high side switching components like BUCK, half bridge, full bridge, etc. This PFC converter circuit drives the boost inductor of the boost circuit by using the switching components of the bridge type DC-DC converter, which eliminates the use of boost switching components and boost rectifiers in conventional boost PFC circuits, also eliminates the use of individual PWM PFC control units.

Abstract: An AC-DC converter with a dual-rectification full bridge interleaved single stage PFC circuit and its control method are disclosed. The converter uses two switching components of a full bridge converter to alternately drive two boost inductors, which eliminates the use of two boost switching components and two boost rectifiers required in a conventional interleaved boost PFC circuit, and also saves individual PWM PFC control circuit.