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A kind of control method and device of switch tube

A switching tube and switching frequency technology, which is applied in the control field of switching tubes, can solve problems such as affecting circuit efficiency and affecting device loss, and achieve the effect of improving efficiency and reducing device loss.

Active Publication Date: 2018-06-19
VERTIV CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the prior art, no matter what the working conditions are, the switching frequency of the switching tube in the active PFC circuit is a constant constant value, and this constant value is determined based on the worst working conditions
The switching frequency of the switching tube directly affects the loss of the devices in the active PFC circuit, which in turn affects the efficiency of the circuit. Therefore, from the perspective of efficiency, the control scheme with a constant switching frequency of the switching tube is not optimal

Method used

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  • A kind of control method and device of switch tube
  • A kind of control method and device of switch tube
  • A kind of control method and device of switch tube

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Embodiment Construction

[0019] In order to provide an implementation plan for improving the efficiency of the active PFC circuit, the embodiment of the present invention provides a control method and device for a switching tube. The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the The preferred embodiments are only used to illustrate and explain the present invention, not to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0020] An embodiment of the present invention provides a method for controlling a switching tube of an active PFC circuit, such as figure 2 As shown, can include:

[0021] Step 201, obtaining the input voltage value of the active PFC circuit;

[0022] Step 202, based on the predetermined relationship between the input voltage value of the active PFC circu...

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Abstract

The invention discloses a control method and device for a switch tube, which are used to improve the efficiency of an active power factor correction circuit. The method includes: obtaining an input voltage value of the active PFC circuit; determining the obtained input voltage value based on a predetermined relationship between the input voltage value of the active PFC circuit and the switching frequency of the switching tube of the active PFC circuit The corresponding switching frequency of the switching tube; the switching tube of the active PFC circuit is controlled based on the determined switching frequency of the switching tube.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method and device for a switching tube of an active power factor correction circuit. Background technique [0002] At present, a PFC (Power Factor Correction, power factor correction) circuit is installed in many power supply products to protect the grid environment. Compared with passive PFC circuits, active PFC circuits are more widely used. The active PFC circuit makes the input current waveform track the input voltage waveform by controlling the duty cycle of the switching tube in the circuit, so as to reduce reactive power and improve power factor. figure 1 The Boost PFC circuit shown is a common active PFC circuit. Inductor L, switch tube Q, diode D and capacitor C1 constitute the basic Boost circuit, C2 is the input filter capacitor, and LOAD is the load. [0003] However, in the prior art, no matter what the working conditions are, the switching freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M1/42
CPCH02M1/08H02M1/42H02M1/0003Y02B70/10Y02P80/10
Inventor 许光华方强杨瑞国李剑
Owner VERTIV CORP
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