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Switching power supply circuit

A switching power supply circuit and switching technology, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and adjusting electric variables, etc., can solve the problems of switching power supply with wide input and output voltage range and high system efficiency, and achieve wide input and output voltage range , high efficiency effect

Pending Publication Date: 2022-03-04
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a switching power supply circuit, which is used to solve the problem that the wide input and output voltage range and high system efficiency of the switching power supply cannot be balanced in the prior art

Method used

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Examples

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Embodiment 1

[0086] Such as figure 2 As shown, this embodiment provides a switching power supply circuit 1, and the switching power supply circuit 1 includes:

[0087] Transformer 11 , resonant capacitor Cr, resonant inductance Lr, power switch module 12 , output rectifier module 13 and working mode control module 14 .

[0088] Such as figure 2 As shown, as an example, the power switch module 12 is a half-bridge structure, including a first power switch tube Q1 and a second power switch tube Q2 connected in series between the input voltage Vin and the reference ground, the first power switch The first terminal of the switching tube Q1 receives the input voltage Vin, the second terminal is connected to the first terminal of the second power switching tube Q2; the second terminal of the second power switching tube Q2 is grounded. The second end of the first power switch tube Q1 and the first end of the second power switch tube Q2 are grounded sequentially via the resonant inductor Lr, th...

Embodiment 2

[0099] Such as Figure 9 As shown, the present embodiment provides a switching power supply circuit 1 , which is different from the first embodiment in that the structure of the output rectification module 13 is different.

[0100] Such as Figure 9 As shown, the secondary winding includes a third secondary winding and a fourth secondary winding. The output rectifying module 13 includes a third switch unit S3 , a fourth switch unit S4 , a fifth switch unit S5 , a first capacitor C1 and a second capacitor C2 . The current input end of the third switch unit S3 is connected to the same-named end of the third secondary winding and the primary winding, and the current output end is connected to the output capacitor Cout and the upper plate of the first capacitor C1; In the AHB mode, the third switch unit S3 is turned on and rectifies the signal input to the third switch unit S3, and in the AHB mode, the third switch unit S3 is turned off. The lower plate of the first capacitor C...

Embodiment 3

[0107] Such as Figure 12 As shown, this embodiment provides a switching power supply circuit 1. The difference from Embodiments 1 and 2 is that the structure of the output rectification module 13 is different. In this embodiment, the output rectification module 13 adopts a full-bridge rectifier structure.

[0108] Such as Figure 12 As shown, the secondary winding includes a fifth secondary winding. The output rectifying module 13 includes a sixth switch unit S6 , a seventh switch unit S7 , an eighth switch unit S8 and a ninth switch unit S9 . The current input terminal of the sixth switch unit S6 is connected to the same-named terminal of the fifth secondary winding and the primary winding, and the current output terminal is connected to the upper plate of the output capacitor Cout; both in LLC mode and AHB mode. The signal input to the sixth switch unit S6 is rectified. The current input terminal of the seventh switch unit S7 is grounded, and the current output terminal...

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Abstract

The invention provides a switching power supply circuit comprising a transformer comprising a primary winding and a secondary winding; the resonant capacitor and the resonant inductor are connected in series with the primary winding to form a series structure; the power switch module receives an input voltage and is connected with the two ends of the series structure to form a resonant circuit; the output rectification module is connected with the secondary winding and generates an output voltage; the working mode control module receives the input voltage and the output voltage, and when the ratio of the input voltage to the output voltage is smaller than or equal to a preset value, the output rectification module is controlled to enable the switching power supply circuit to work in an LLC mode. And when the ratio of the input voltage to the output voltage is greater than the preset value, the output rectifier module is controlled to enable the switching power supply circuit to work in an AHB mode. According to the invention, the AHB and the LLC topology are unified, and the switching power supply circuit simultaneously has the advantages of high efficiency and wide input and output range by switching the topology working mode.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a switching power supply circuit. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. Switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is indispensable for the rapid development of today's electronic information industry. A power supply method. [0003] LLC topology and AHB (Asymmetrical Half-Bridge, asymmetrical half-bridge) topology are two common topologies in switching power supplies. Among them, the LLC topo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569H02M3/33592Y02B70/10H02M3/33571H02M3/01H02M1/0048H02M1/0032H02M3/1588H02M7/217
Inventor 章夏荷邓建
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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