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Control method and control circuit of switching power supply device

A technology for controlling circuits and switching power supplies, applied in the field of power supplies, can solve problems such as increased switching loss, achieve simple circuits, and prevent discontinuous changes in input current.

Active Publication Date: 2019-05-14
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a switching power supply device having a critical mode power factor correction circuit operates, there is a problem that the frequency of turning on and off of a switch increases with a decrease in load, thereby causing an increase in switching loss

Method used

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  • Control method and control circuit of switching power supply device
  • Control method and control circuit of switching power supply device
  • Control method and control circuit of switching power supply device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1 of the present application provides a control circuit for controlling on and off of switching elements in a switching power supply device, wherein the switching power supply device and the control circuit constitute a switching power supply device.

[0063] figure 1 is a circuit configuration diagram of the switching power supply device of the first embodiment. Such as figure 1 As shown, the switching power supply device 1 includes a switching power supply device 10 and a control circuit 20, wherein the switching power supply device 10 includes a rectifying unit 101, an inductor 102, a switching element 103, and a diode 104, and the control circuit 20 includes a turn-off time control unit 201 , a zero current detection unit 202 , a frequency limiting unit 203 and a conduction moment control unit 204 .

[0064] Such as figure 1 As shown, in the switching power supply device 10, the rectifying unit 101 is used to rectify the AC voltage of the input AC p...

Embodiment 2

[0090] Embodiment 2 of the present application provides a control circuit, which is a specific implementation manner of the control circuit in Embodiment 1. In Embodiment 2, the structure of the frequency limiting unit 203 is described. Like the first embodiment, the control circuit and the switching power supply device of the second embodiment constitute a switching power supply device.

[0091] image 3 is the circuit structure diagram of the switching power supply device of embodiment 2, and figure 1 The same parts will not be described repeatedly. image 3 and figure 1 The difference is that image 3 The composition structure of the frequency limiting unit 203 is shown.

[0092] Such as image 3 As shown, the frequency limiting unit 203 may include a capacitor C4, a switch Q3, a comparator CP2, and a current source I2, wherein the output terminal of the comparator CP2 is used as the output terminal of the frequency limiting unit 203, and the inverting input termina...

Embodiment 3

[0110] Embodiment 3 of the present application provides a control method for a switching power supply, which corresponds to the control circuits of Embodiment 1 and Embodiment 2, and is used to control figure 1 , figure 2 and image 3 The switching elements in the switching power supply shown are controlled.

[0111] Figure 10 It is a schematic flow chart of the control method of the present embodiment 3, such as Figure 10 As shown, the method includes:

[0112] S1001. Control the disconnection of the switch element according to the voltage difference between the reference voltage and the output DC voltage;

[0113] S1002. Detect the moment when the current flowing through the inductor is zero;

[0114] S1003. Generate a limit signal according to the time constant adjustment signal, the limit signal is used to set a delay period from the moment when the switching element is turned off, wherein the magnitude of the time constant adjustment signal changes with time; and...

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Abstract

The invention provides a switching power supply device control circuit and control method, and is used for controlling the switching element in a switching power supply device. The control circuit comprises a disconnection moment control unit which is used for controlling disconnection of the switching element according to the voltage difference between the reference voltage and the output DC voltage; a zero current detection unit which is used for detecting the moment when the current flowing through the inductor is zero; a frequency limiting unit which generates a limiting signal according to a time constant adjusting signal, wherein the limiting signal is used for setting the delay period starting from the disconnection moment of the switching element, and the size of the time constant adjusting signal changes along with time; and a conduction moment control unit which is used for controlling conduction of the switching element according to the detection result outputted by the zero current detection unit and the limiting signal outputted by the frequency limiting unit. According to the switching power supply device control circuit and control method, distortion of the input current can be avoided by the simple circuit.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a control method and a control circuit for a switching power supply device. Background technique [0002] At present, in order to improve the utilization efficiency of the power supply, a power factor correction circuit (Power Factor Corrector, PFC) is usually added to the switching power supply device to form a switching power supply device. [0003] Common power factor correction circuits in the prior art include critical mode power factor correction circuits (CriticalMode PFC) and continuous conduction mode power factor correction circuits (Continue Conduction Mode PFC). When a switching power supply device having a critical mode power factor correction circuit operates, there is a problem that the frequency of turning on and off of a switch increases with a decrease in load, thereby causing an increase in switching loss. [0004] In Patent Document 1 (Japanese Patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M1/08
CPCH02M1/08H02M7/217
Inventor 寺泽阳一大竹修一濑聪
Owner SANKEN ELECTRIC CO LTD
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