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A DC polarity detection and protection circuit module

A protection circuit module and polarity detection technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of circuit failure, lack of flexibility and accuracy, and inability to judge polarity, etc., to achieve low loss and disconnection Rapid opening and closing, stable and reliable, low on-resistance effect

Active Publication Date: 2017-02-08
贺川
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the existing technologies are DC source input, which is the working power input of the device. Before the DC source is not connected, the device does not work, and through the different polarity of the DC source, some switching devices are controlled to make the circuit reversed. cannot be connected to the device to protect the device
However, when the device itself does not use the input DC source as the working power supply and the device is already working, this anti-reverse circuit cannot judge whether the polarity is reversed. In addition, it cannot distinguish between reversed polarity and DC input not connected. situation, only reversed polarity and no DC input can be processed in the same way, which lacks the flexibility and accuracy of control

Method used

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  • A DC polarity detection and protection circuit module
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  • A DC polarity detection and protection circuit module

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment one, as attached figure 2 As shown, a circuit block diagram of a DC polarity detection and protection circuit module that is only used for reverse polarity protection. The input unit 1 includes a resistor R1, a diode D1 and a diode D2. The input DC power is connected to The anode of the diode D1 is connected to the cathode of the diode D2 to output a polarity detection signal, the cathode of the diode D1 is connected to the working power supply VCC, and the anode of the diode D2 is connected to the working power supply ground; the processing unit 2 is realized by a buffer. When the input DC power supply is forward connected, the diode D1 is turned on, so that the voltage at the anode of the diode D1 is VCC+Vd1 (Vd1 is the conduction voltage drop of the diode D1). By selecting an appropriate resistance value of the resistor R1 and controlling the current flowing through the diode D1, the voltage drop of the diode D1 can be made less than 0.3V. In this way, t...

Embodiment 2

[0025] Embodiment two, as attached image 3 As shown, a circuit block diagram of a DC polarity detection and protection circuit module with complex control functions is realized. Compared with the implementation example 1, the processing unit 2 is implemented by logic AND gates. In this way, multiple signals can be synthesized. When all signals are at high level, the logic AND gate inputs a high level to control the switch of the drive unit 3 to close, otherwise it outputs a low level to make the switch of the drive unit 3 open. Therefore, multiplexing of the protection circuit of the main circuit with other protections is realized, and the cost of the system is saved. Here, the processing unit 2 may use other logic circuits in addition to logic AND gates to implement specific required logic control.

Embodiment 3

[0026] Embodiment three, as attached Figure 4 As shown, a circuit block diagram of a DC polarity detection and protection circuit module for complex logic control and analysis. Compared with the implementation example 1, the input unit 1 adds resistors R2 and resistors R3, and the processing unit 2 adopts Implemented by a microprocessor, it can detect three states of input DC power forward connection, reverse connection and no connection. The resistor R2 is connected in parallel with the diode D1, and the resistor R3 is connected in parallel with the diode D2. Similar to Embodiment 1, when the input DC power supply is connected forwardly and reversely, the generated polarity detection signals are VCC+Vd1 and -Vd2 respectively; when the input DC power supply is not connected, the power supply VCC passes through the resistor R2 and the resistor R2. R3 divides the voltage to generate a polarity voltage of select R 2 = R 3, then when there is no connection, the polarity volt...

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PUM

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Abstract

The invention discloses a direct current polarity detection and protection circuit module which comprises an input unit, a processing unit, a switch driving unit and a power converting module. The input unit comprises a resistor R1, a resistor R2, a resistor R3, a diode D1 and a diode D2, the processing unit is respectively connected with an output end of the input unit and the switch driving unit, and the switch driving unit is connected with a positive pole of an input direct current power supply and the power converting unit. According to the direct current polarity detection and protection circuit module, by the aid of a simple circuit, the judgment of the polarity of the input direct current power supply and the function of the reverse connection protection are achieved, logic signals of three states such as normal polarity, reversed polarity and non-connection can be provided when the input direct current source is not used as a working power supply for a device, the flexibility and the reliability of a system are high, and the cost is low.

Description

technical field [0001] The invention relates to a DC power input protection circuit module, in particular to a protection circuit module capable of detecting DC polarity. Background technique [0002] At present, DC power input devices have requirements on the polarity of the input DC power in most occasions, and cannot be connected casually. If the polarity of the power supply is reversed, it will cause damage to the equipment or damage to the input DC power supply, battery, etc., resulting in economic losses. To prevent the reverse connection of the power supply, the interface of the connector can be used to make the positive and negative of the DC power supply correspond to each other, and the reverse connection cannot be connected, so as to avoid the reverse connection of the polarity. However, in some occasions, the positive and negative polarity connectors cannot be made into special connectors, but are the same. loss, and manual inspection is unreliable. The simple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H11/00
Inventor 贺川
Owner 贺川