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Switch power source remote control circuit

A switching power supply and remote control circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of poor anti-static interference, easy failure of undervoltage protection, flat temperature drift, etc., to improve overall performance and save layout The effect of less board space and less components

Active Publication Date: 2014-08-13
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a switching power supply remote control circuit, which solves the problems of poor anti-static interference ability of the existing remote control circuit, easy failure of undervoltage protection, and temperature drift of the remote control level in high and low temperature environments

Method used

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Effect test

Embodiment 1

[0030] Such as figure 2Shown is a circuit diagram of Embodiment 1 of the present invention, including a switching power supply control circuit 1 , a voltage sampling circuit 2 and a remote control port circuit 3 . The switching power supply control circuit 1 can preferably be composed of a control chip IC MS003 and a resistor RI, the resistor RI is connected between the Ri terminal of the control IC MS003 and the ground, the voltage sampling circuit 2 is composed of resistors R1 and R2 connected in series, and the other end of the resistor R1 is connected The sampling voltage input terminal Vin, the other end of the resistor R2 is connected to the undervoltage protection terminal UVP of the control IC, the connection point of the two resistors is the second input terminal of the voltage sampling circuit 2, and the remote control pin REM is the input terminal of the remote control port circuit 3. The input terminal of the remote control port circuit 3 is connected to the secon...

Embodiment 2

[0043] In high and low temperature environments, the PN junction voltage drop of semiconductor devices will have obvious differences, generally 0.1-0.2V. Such differences will be continuously amplified with the design of the circuit, so that the remote control level will appear significantly in different environments. The difference between them will cause inconsistent remote control levels in high and low temperature environments. exist figure 2 The shown voltage sampling circuit 2 is added with Zener diode DZ1, such as Figure 4 In the second embodiment of the present invention shown, the cathode of the Zener diode DZ1 is connected to the voltage input terminal Vin, the anode is connected to the resistor R1, and the rest are connected with figure 2 The first embodiment shown is the same, because the conduction voltage drop of the semiconductor device will increase with the decrease of temperature, that is, Vbe will increase, so the voltage VI of the undervoltage protectio...

Embodiment 3

[0045] When there is a greater level of static electricity or a surge signal entering the circuit, it can be figure 2 The shown remote control port circuit 3 is added with a capacitor C1 with filter absorption function, such as Figure 5 In the third embodiment of the present invention shown, the capacitor C1 is connected between the remote control pin REM and the ground, and the rest are connected with the ground. figure 2 The embodiment 1 shown is the same, after the input terminal of the remote control port circuit 3, that is, the remote control pin REM increases the absorbing capacitor C1, it can absorb and bypass the instantaneous static pulse or surge signal to a certain extent, thereby improving the remote control pin REM. REM's anti-static rating.

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Abstract

A switch power source remote control circuit comprises a switch power source control circuit, a voltage sampling circuit and a remote control port circuit. The switch power source control circuit comprises a switch power source control chip with the low-voltage protection function. The sampling voltage input end Vin is the first input end of the voltage sampling circuit and a remote control pin REM is the input end of the remote control port circuit. The output end of the remote control port circuit is connected with the second input end of the voltage sampling circuit. The output end of the voltage sampling circuit is connected with the low-voltage protection end UVP of the switch power source control chip to control the low-voltage protection function of the switch power source control chip to be started or stopped. The remote control function of a power source is effectively achieved through remote control of the remote control pin REM, the sampling voltage partition function of the voltage sampling circuit and the under-voltage protection turn-off function of the switch power source control chip. The problems that an existing remote control circuit is poor in antistatic interference capacity and prone to under-voltage protection failure and remote control level temperature excursion in high-temperature and low-temperature environments are solved.

Description

technical field [0001] The invention relates to a switching power supply remote control circuit, in particular to a switching power supply remote control circuit with undervoltage protection, remote control function, high power density, small volume, and high requirements for electrostatic protection. Background technique [0002] In the field of current module power supplies, especially in low-power module power supplies, they generally have remote control functions and undervoltage protection functions at the same time. These two functions are generally realized through the peripheral circuit of the power supply. The remote control function described above is for the convenience of application of system equipment, and the use of small signals to realize the control of the module power supply on and off is called the remote control function. The function pin added to this power module is called the remote control pin REM. [0003] The Chinese utility model application with...

Claims

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Application Information

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IPC IPC(8): H02M1/36
Inventor 开秋月唐盛斌
Owner MORNSUN GUANGZHOU SCI & TECH
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