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Input undervoltage protection circuit

A protection circuit, input undervoltage technology, applied in emergency protection circuit devices, protection against undervoltage or no voltage, DC power input conversion to DC power output, etc., can solve the waste of PCB board area and increase the number of resistors Increased number and package size, etc., to reduce design difficulty, reduce resistance, and reduce power loss

Active Publication Date: 2017-10-27
MORNSUN GUANGZHOU SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Visible, in figure 1 In the prior art shown, the functions of input under-voltage protection and feed-forward compensation are separated from each other, which will increase the number of resistors directly connected to the input voltage, thereby generating unnecessary losses, and as the input voltage range increases Widening, this loss becomes more and more unbearable, and at the same time, in order to ensure reliability, the package size of the resistor must also increase, resulting in a waste of PCB board area

Method used

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Examples

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Embodiment 1

[0029] figure 2 It is a simplified diagram of the application circuit of the present invention. The input undervoltage protection circuit described in the present invention is a circuit in the controller 10, and other circuits in the controller 10 are irrelevant to the present invention and will not be described here. figure 2 The main power topology is a well-known technology, including the input voltage V in , output voltage V out , capacitance C VIN , Voltage divider resistor R s1 and R s2 , controller 10, main power transformer, main power tube M1, diode D OUT , capacitance C 2 , inductance L 1 and capacitance C 3 and other components. The GT pin is the drive output of the controller 10, which is used to control the turn-on and turn-off of the power transistor M1; the CS pin detects the current sampling resistor R CS The voltage to determine the peak current flowing through the power tube M1; the UVP pin is the detection pin of the input undervoltage protection,...

Embodiment 2

[0054] The difference from Embodiment 1 is that the clamping module 202 of Embodiment 2 further includes a PMOS transistor PM3 and an NMOS transistor NM4 . The source of PM3 is connected to the pin UVP, the gate is connected to the gate of PM1, the drain is connected to the gate and drain of NM4; the source of NM4 is connected to the reference ground.

[0055] Because of the addition of this current branch where PM3 is located, the current I that can be released by the clamp module 202 UVP larger, compared with the clamping module 102 of Embodiment 1, the voltage divider resistor R s1 Under the same conditions, the clamping module 202 is applicable to a wider input voltage range. In order to facilitate the description of the circuit principle, the width-to-length ratios of the NMOS transistors NM2 and NM3 of the clamping module 202 are the same, and the ratio of the width-to-length ratios of the PMOS transistors PM2 and PM3 is

[0056]

[0057] So the current I of Example...

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PUM

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Abstract

The invention provides an input voltage protection circuit. Functions such as input undervoltage protection and feedforward compensation can be realized without an additional pin or sampling resistor; the two functions perform time sharing and multiplexing on a pin, and are mutually independent; the accuracy is high; the production cost can be further lowered; and application scopes of a controller and a switching power supply can be widened.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to an input undervoltage protection circuit with feedforward compensation. Background technique [0002] With the rapid development of electronic technology, a full-featured switching power supply control often needs to include other functions, such as input undervoltage protection and feedforward compensation, in addition to the necessary main power control circuit. figure 1 As shown, it is a simplified diagram of the application circuit of a switching power supply with an external feed-forward compensation circuit. The main power topology is a known technology, including the input voltage V in , output voltage V out , capacitance C VIN , Voltage divider resistor R s1 and R s2 , controller, main power transformer, main power tube M1, diode D OUT , capacitance C 2 , inductance L 1 and capacitance C 3 and other components. The GT pin is the drive output of t...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02H3/24H02M3/335
CPCH02H3/24H02H7/1213H02M3/33507H02M1/0022
Inventor 唐盛斌符威
Owner MORNSUN GUANGZHOU SCI & TECH
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