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A system and method for realizing the isolation of high frequency switch DC-DC conversion

A high-frequency switching, DC-DC technology, applied in conversion equipment with intermediate conversion to AC, control/regulation systems, conversion of DC power input to DC power output, etc., can solve the risk of low dynamic adjustment response and transformer magnetic saturation , isolation transformer whistling and other problems, to achieve the effect of improving dynamic adjustment response speed, avoiding delay, and high dynamic adjustment response capability

Inactive Publication Date: 2007-10-24
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing technical solution, the adjustment of the output voltage of the load is adjusted by controlling the turn-on and cut-off time of the MOS transistor on the primary side of the isolation transformer through the duty cycle adjustable PWM control signal output by the PWM controller. When the dynamic adjustment range of the output voltage is wide When the duty cycle of the PWM controller is adjustable, the duty cycle of the PWM control signal output by the PWM controller will change greatly, which will easily cause the transformer's working magnetic induction to exceed the transformer's saturation magnetic induction, resulting in the risk of transformer magnetic saturation, and causing isolation in practical applications. Transformer whine and other problems, and at the same time, due to the delay caused by the feedback voltage signal of the isolation device such as the voltage feedback isolation optocoupler connected to the primary side of the transformer, in practical applications, when the circuit output a wide range of voltage adjustment, the dynamic adjustment response is very low

Method used

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  • A system and method for realizing the isolation of high frequency switch DC-DC conversion
  • A system and method for realizing the isolation of high frequency switch DC-DC conversion
  • A system and method for realizing the isolation of high frequency switch DC-DC conversion

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Embodiment 1

[0059] FIG. 4 is a schematic structural diagram of a system implementing DC-DC conversion of an isolated high-frequency switch according to Embodiment 1 of the present invention. Referring to FIG. 4 , the system includes: a transformer primary side circuit 31 , a PWM controller 32 , a transformer 33 and a transformer secondary side circuit 34 . in,

[0060] The transformer primary side circuit 31 includes MOS transistors Q1, Q2, Q3 and Q4, the source of MOS transistor Q1 is connected to the drain of MOS transistor Q3 and the input voltage of the transformer, the source of MOS transistor Q2 is connected to the drain of MOS transistor Q4 and the input voltage of the transformer The other ends are connected; the drains of MOS transistors Q1 and Q2 are connected to one end of the input voltage, the sources of MOS transistors Q3 and Q4 are connected to the other end of the input voltage, and the MOS transistors Q1, Q3, Q2, and Q4 respectively form the primary side of the isolated D...

Embodiment 2

[0090] In the first embodiment, in the conversion circuit topology circuit having the combined functions of two-phase BUCK conversion and synchronous rectification, the two-phase BUCK conversion circuit constitutes a single output voltage conversion circuit. It is also possible to independently output each phase of the two-phase BUCK conversion circuits to form a dual-output voltage conversion circuit.

[0091] FIG. 12 is a schematic structural diagram of a system implementing DC-DC conversion of an isolated high-frequency switch according to Embodiment 2 of the present invention. Referring to FIG. 12 , the system includes: a transformer primary side circuit 31 , a PWM controller 32 , a transformer 33 and a transformer secondary side circuit 34 . in,

[0092] Transformer primary side circuit 31, including MOS transistors Q1, Q2, Q3 and Q4, forms two bridge arms of the primary side full bridge of the isolated DC-DC conversion transformer, and is used for full bridge conversion...

Embodiment 3

[0111] FIG. 15 is a schematic structural diagram of a system implementing DC-DC conversion of an isolated high-frequency switch according to Embodiment 3 of the present invention. Referring to FIG. 15 , it includes a transformer primary side circuit 31 , a transformer 33 , an intermediate voltage conversion circuit, a PWM controller 32 and a post-stage non-isolated DC-DC conversion circuit.

[0112] Transformer primary side circuit 31, including MOS transistors Q1, Q2, Q3 and Q4, forms two bridge arms of the primary side full bridge of the isolated DC-DC conversion transformer, and is used for full bridge conversion of the input voltage;

[0113] Transformer 33 is an isolated main transformer with a center tap, and the center tap is used as the third output terminal of the transformer; it is used for isolating the primary side circuit of the transformer and the intermediate voltage conversion circuit and converting the input voltage of the transformer into the output voltage of...

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Abstract

The disclosed DC-DC conversion system for implementing isolated high-frequency switch comprises: a primary circuit of transformer to output square-wave voltage to a transformer, a PWM controller to output PWM control signal and drive circuits, and a secondary circuit of transformer including a BUCK conversion circuit to receive PWM control signal from the PWM controller and take BUCK conversion to the square wave voltage and feedback the load signal to the controller. This invention can improve the dynamic regulation response for entire circuit.

Description

technical field [0001] The invention relates to DC voltage conversion circuit technology, in particular to a system and method for realizing DC-DC conversion of an isolated high-frequency switch. Background technique [0002] DC (DC, Direct current) voltage conversion circuit is also called a DC chopper, it is a circuit that converts a DC voltage into another fixed voltage or an adjustable DC voltage, and is widely used in controllable DC switching regulated power supplies , DC motor speed control and welding power supply and other fields. In the field of high-frequency switching, a high-frequency DC-DC converter is used to convert the input voltage into another form of output through the main circuit with semiconductor power devices as switches. When converting, it adopts automatic control closed-loop stable output and has a protection link, so that Obtain various voltage and current outputs required by users. [0003] Figure 1 is a schematic diagram of the existing isola...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335H02M1/00
CPCH02M3/33576H02J1/002
Inventor 李成勇
Owner HUAWEI TECH CO LTD
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