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Device and method for inductive current sampling of bridge-free PFC circuit

A technology of inductor current and sampling device, which is applied in the field of electricity, can solve the problems of reduced reliability of power supply and small duty cycle of PFC circuit, etc., and achieve the effects of reducing difficulty and complexity, flexible control, and comprehensive sampling

Inactive Publication Date: 2014-05-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a bridgeless PFC circuit inductance current sampling device and method to solve the problem that the PFC circuit has a very small duty cycle when the AC high voltage is input in the bridgeless PFC circuit in the prior art, thus causing power failure when sampling the inductance current. The problem of reduced reliability

Method used

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  • Device and method for inductive current sampling of bridge-free PFC circuit
  • Device and method for inductive current sampling of bridge-free PFC circuit
  • Device and method for inductive current sampling of bridge-free PFC circuit

Examples

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example 1

[0039] Example 1, the first sampling unit is the first sampling resistor Rs1, the second sampling unit is the second sampling resistor Rs2, and the third sampling unit is the third sampling resistor Rs3.

[0040] Figure 4 It is a structural schematic diagram of Example 1 of the embodiment of the present invention, such as Figure 4 As shown, the first end of the first inductance L1 of the bridgeless PFC circuit is connected to the first end of the AC power supply of the bridgeless PFC circuit, and the second end of the first inductance L1 is connected to the first boost diode D1 of the bridgeless PFC circuit connected to the anode of the bridgeless PFC circuit, and connected to the first end of the first switch S1 of the bridgeless PFC circuit; the second end of the first switch S1 is connected to the first end of the first sampling resistor Rs1, and sends out the inductance of the bridgeless PFC circuit The first sampling signal V1 of the current; the second terminal of the...

example 2

[0043] Example 2, the first sampling unit is the first current mutual induction device, the second sampling unit is the second current mutual induction device, and the third sampling unit is the third current mutual induction device;

[0044] Figure 5 It is a schematic diagram of Example 2 of the embodiment of the present invention, such as Figure 5 As shown, the first current mutual induction device includes: a first current transformer CT1, a fifth resistor R5, a fifth diode D5, and a fourth sampling resistor Rs4, the first end of the secondary side of the first current transformer CT1 is connected to the first The first end of the fifth resistor R5 is connected, the anode of the fifth diode D5 is connected to the first end of the fifth resistor R5, the cathode of the fifth diode D5 is connected to the first end of the fourth sampling resistor Rs4, and Sending the first sampling signal V1 of the inductor current of the bridgeless PFC circuit, the second end of the fifth r...

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Abstract

The invention discloses a device and method for inductive current sampling of a bridge-free PFC circuit. The device comprises a first sampling unit, a second sampling unit and a third sampling unit. The device for inductive current sampling of the bridge-free PFC circuit is connected with the bridge-free PFC circuit. The first sampling unit is in series connection with a first switch tube of the bridge-free PFC circuit and is used for sampling a current passing through the first switch tube and obtaining first sampling signals V1; the second sampling unit is in series connection with a second switch tube of the bridge-free PFC circuit and is used for sampling a current passing through the second switch tube and obtaining second sampling signals V2; one end of the third sampling unit is connected with the grounding end of the bridge-free PFC circuit, the other end of the third sampling unit is connected with the negative output end of an PFC capacitor of the bridge-free PFC circuit, and the third sampling unit is used for sampling a current passing through a booster diode of the bridge-free PFC circuit and obtaining third sampling signals V3.

Description

technical field [0001] The present invention relates to the field of electricity, in particular to a bridgeless power factor correction (Power Factor Correction, PFC for short) circuit inductance current sampling device and method. Background technique [0002] With the rapid development of modern industry, the requirements for power supply systems are increasing day by day, and green and energy saving have become the application trend of power supplies. Therefore, power conversion topologies with high efficiency and high power density are increasingly favored by the industry. Due to its high efficiency and high power density, the bridgeless power factor correction circuit is gradually being applied to high efficiency and high power density power modules. [0003] In the bridgeless PFC circuit, it is necessary to sample the inductor current for loop control, so as to ensure that the AC input current follows the AC input voltage and realize the power factor correction functi...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCH02M1/4225H02M1/4233G01R19/0092H02M1/42Y02B70/10Y02P80/10H02M1/0009H02M1/0085G01R19/00H02M1/4208H02M7/217
Inventor 浦锡锋郑大成戴彬传李丹万正海李俊凯
Owner ZTE CORP
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