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Isolated type power circuit and circuit and method for transmitting control signals thereof

A technology for controlling signals and power circuits, applied in the field of electronics, can solve the problems of inability to realize accurate and fast control of power circuits, increase in size and cost of power circuits, and poor effectiveness of control signals, so as to improve safety and reliability and reduce costs. , the effect of small size

Active Publication Date: 2013-08-28
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1) The existence of the transformer leads to a large increase in the size and cost of the power circuit;
[0008] 2) The effectiveness of the transformer for control signals with high transmission frequency is poor, and it is impossible to achieve precise and fast control of the power circuit

Method used

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  • Isolated type power circuit and circuit and method for transmitting control signals thereof
  • Isolated type power circuit and circuit and method for transmitting control signals thereof
  • Isolated type power circuit and circuit and method for transmitting control signals thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] figure 2 It is a schematic structural diagram of a control signal transmission circuit used in an isolated power supply circuit provided in this embodiment.

[0069] see figure 2 As shown, the control signal transmission circuit of this embodiment mainly includes: a first signal conversion circuit 201, a second signal conversion circuit 202, and a second control signal generation circuit 203. The main connections and working principles are as follows:

[0070] The first signal conversion circuit 201 is connected between the first ground level GND1 and the second ground level GND2 in the isolated power supply circuit, wherein the first ground level GND1 contains the ground line noise signal VGND1; the first signal conversion circuit 201 is used to obtain the first ground noise component VGND1 according to the ground noise signal VGND1 n1 , the first ground noise component V n1 First proportional to the ground noise signal VGND1.

[0071] In this embodiment, the imp...

Embodiment 2

[0082] Figure 4 This embodiment provides a schematic diagram of a circuit using the control signal transmission circuit of this embodiment to control the flyback synchronous rectification switching power supply circuit.

[0083] see Figure 4 As shown, in the flyback synchronous rectification switching power supply, the primary switching tube controller outputs the first control signal V1 to control the primary switching tube Q1, and the first square wave signal generating circuit 40 inverts the first control signal V1 to obtain The first square wave signal VS1 having a phase opposite to that of the first control signal V1 includes a ground noise signal VGND1 . In addition, those skilled in the art know that, in order to avoid the cross-conduction phenomenon of the synchronous rectification switching power supply, the first square wave signal generating circuit 40 may further include a delay circuit for delaying the first control signal V1 to a certain extent, The implement...

Embodiment 3

[0107] Image 6 This embodiment provides a schematic circuit diagram of applying the control signal transmission circuit of this embodiment to realize the control of the forward synchronous rectification switching power supply circuit.

[0108] see Image 6 As shown, the implementation and working principles of the control signal transmission circuit and the isolation circuit 404 are basically the same as those in Embodiment 2, and will not be repeated here.

[0109] Different from the flyback synchronous rectification switching circuit, the control signals of the primary side switching tube Q1 and the secondary side switching tube Q2 of the forward synchronous rectifying switching power supply circuit are in the same phase, so there is no need for the first square wave signal generating circuit 40 Set the inverter circuit and delay circuit.

[0110] In addition, since the secondary side of the forward synchronous rectification switching power supply circuit has two power sw...

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Abstract

The invention relates to the field of electronics, and discloses an isolated type power circuit, and a circuit and method for transmitting control signals of the isolated type power circuit. The method for transmitting control signals of the isolated type power circuit comprises the following steps that first ground wire noise components are obtained according to ground wire noise signals, the first ground wire noise components and the ground wire noise signals are in a predetermined ratio, first peak signals containing second ground wire noise components are generated according to first control signals of the isolated type power circuit, the first control signals contain the ground wire noise signals, the second ground wire noise components and the ground wire noise signals are in a predetermined ratio, second control signals are obtained according to the first peak signals and the first ground wire noise components, and the isolated type power circuit is controlled to be switched on and switched off according to the second control signals. By means of the technical scheme, the control signals used for controlling the isolated type power circuit are effectively transmitted, and the control accuracy of the isolated type power circuit is improved.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an isolated power supply circuit and its control signal transmission circuit and method Background technique [0002] In the switching power supply, in order to ensure the normal and stable operation of the system, and to achieve constant current, constant voltage or synchronous rectification control under different application backgrounds, the effectiveness of the switching tube control signal must first be guaranteed. Especially in isolated switching power supplies, since the original signal (for example: secondary output voltage feedback signal) and the target control signal (for example: primary switch tube control signal) are usually not on the same side, how to accurately and quickly according to the original control Signal generation target control signal has become a key technology. [0003] figure 1 Shown is the circuit block diagram of an existing flyback synchronous rectif...

Claims

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Application Information

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IPC IPC(8): H02M3/28
CPCH02M3/33507H02M3/33592Y02B70/10
Inventor 张凌栋赵晨
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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