Three-state three-level PFC circuit and multi-state three-level PFC circuit

A three-level, circuit technology, applied in the field of electronics, can solve the problem that the PFC circuit cannot improve the efficiency and power density at the same time, and achieve the effects of reducing the switching frequency, reducing the size of the inductance and high circuit efficiency.
CN101860192AActive Publication Date: 2010-10-13EMERSON NETWORK POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EMERSON NETWORK POWER CO LTD
Publication Date
2010-10-13

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Abstract

The invention relates to a three-state three-level PFC circuit, which comprises an inductor, a combined three-state switch, a first capacitor and a second capacitor. The inductor is connected between a first end of an AC power supply and a first end of the combined three-state switch; a second end of the combined three-state switch is connected at a first end of the first capacitor; a third end of the combined three-state switch is connected at a second end of the second capacitor; a fourth end of the combined three-state switch is grounded; and the first end of the first capacitor, a second end of the first capacitor, and the second end of the second capacitor output three-level voltage. The invention also provides a multi-state three-level PFC circuit correspondingly. Compared with the common circuit without a three-state switch or a multi-state switch, the PFC circuit provided by the invention can obviously reduce the dimensions of the inductor and the capacitors, improve the powerfactor of the circuit simultaneously and reduce the total harmonic content on the premise of maintaining the switch frequency and ripples on a passive device invariable, and can reduce the switch frequency and obviously improve the circuit efficiency on the premise of maintaining the input current ripple frequency and magnitude invariable.
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Description

technical field

[0001] The invention relates to the field of electronic technology, and more specifically relates to a three-state three-level PFC circuit and a multi-state three-level PFC circuit. Background technique

[0002] High-frequency switching power supplies are widely used in different occasions, such as the need to change the power supply voltage from one voltage level to another required voltage level under many application conditions. In this AC to DC (AC / DC) conversion system, in addition to the required voltage conversion function, it is also necessary to meet various standards for power factor (Power Factor, PF), total harmonic content (Total Harmonics Distortion, THD) and EMI (Electromagnetic Interference) requirements.

[0003] see figure 1 , is a three-level PFC circuit. Such as figure 1 As shown, the first end of the inductor L1 is connected to the first end of the AC power supply, and the second end of the inductor L1 is connected to the first input ...

Claims

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