A voltage self-following anti-backflow circuit

An anti-backfeed and voltage technology, which is applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problem that the circuit cannot work, the constant current charging anti-backfeed and no pressure loss function cannot be realized, and continuous changes are not allowed, etc. problem, to achieve the effect of preventing backfilling

Active Publication Date: 2022-07-15
WILLFAR INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit uses two MOS transistors to realize the anti-backfeed and the voltage at both ends of the anti-backfeed circuit is equal, but because the combination of the two MOS transistors requires that the gate level bound together must be a certain level state, it is not allowed Continuous change
If the voltage at both ends of the anti-backfeed circuit changes continuously, the circuit will not work
In the process of constant current charging, the output voltage of the constant current DC / DC chip increases with the continuous increase of the voltage of the battery or supercapacitor module, so the circuit cannot realize anti-backfeed and no voltage during constant current charging. loss of function

Method used

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  • A voltage self-following anti-backflow circuit
  • A voltage self-following anti-backflow circuit
  • A voltage self-following anti-backflow circuit

Examples

Experimental program
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Effect test

Embodiment approach 1

[0028] figure 1 It is a circuit diagram of the first embodiment. like figure 1 As shown, the voltage self-following anti-backflow circuit includes a diode V11, a diode V12, a PMOS transistor V13, and a resistor R14; the voltage input terminal U_IN of the voltage self-following anti-backflow circuit is connected to the diodes V11 and V12. The anodes and all The drain of the PMOS transistor V13, the voltage output terminal U_OUT of the self-following anti-backflow circuit is connected to the cathodes of the diodes V11 and V12 and the source of the PMOS transistor V13, and the gate of the PMOS transistor V13 Connect to the external control signal input terminal CTRL, the external control signal input terminal CTRL can output high and low levels to control the opening and closing of the PMOS transistor V13; one end of the resistor R14 is connected to the source of the PMOS transistor V13, and the other end is connected to the PMOS transistor. The gate of V13. As a more optimal ...

Embodiment approach 2

[0033] figure 2 It is a circuit diagram of Embodiment 2 of the present invention. like figure 2 As shown, the voltage self-following anti-backflow circuit includes a diode V21, a diode V22, a PMOS tube V23, a transistor V24, a resistor R25, a resistor R26, a capacitor C27, and a capacitor C28; the voltage self-following anti-backflow circuit The voltage input terminal V_CAP Connect the anodes of the diodes V21 and V22 and the drain of the PMOS transistor V23, and the voltage output terminal VOUT of the self-following anti-backflow circuit is connected to the cathodes of the diodes V21 and V22 and the PMOS transistor V23 the source of the PMOS transistor V23, the gate of the PMOS transistor V23 is connected to the collector of the transistor V24, one end of the resistor R26 is connected to the source of the PMOS transistor V23, and the other end is connected to the gate of the PMOS transistor V23, the The emitter of the transistor V24 is grounded, the base of the transistor...

Embodiment approach 3

[0036] Figure 4 It is a circuit diagram of Embodiment 3 of the present invention. like Figure 4 As shown, the voltage self-following anti-backflow circuit includes a diode V31, a diode V32, a PMOS tube V33, a MOS tube V34, a resistor R35, a resistor R36, a capacitor C37, and a capacitor C38; the voltage self-following anti-backflow circuit voltage input terminal V_CAP is connected to the anodes of the diodes V31 and V32 and the drain of the PMOS transistor V33, and the voltage output terminal VOUT of the self-following anti-backflow circuit is connected to the cathodes of the diodes V31 and V32 and the PMOS transistor The source of V33, the gate of the PMOS transistor V33 is connected to the drain of the MOS transistor V34, one end of the resistor R36 is connected to the source of the PMOS transistor V33, and the other end is connected to the gate of the PMOS transistor V33, The source of the MOS transistor V34 is grounded, the gate of the MOS transistor V34 is connected t...

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PUM

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Abstract

The invention relates to a voltage self-following anti-backflow circuit, comprising N diodes, a PMOS tube, and a resistor; the voltage input end of the voltage self-following anti-backflow circuit is connected to the anodes of the N diodes and the PMOS The drain of the tube, the voltage output terminal of the self-following anti-backflow circuit is connected to the cathodes of the N diodes and the source of the PMOS tube, and the gate of the PMOS tube is connected to the external control signal input terminal, so The external control signal input terminal can output high and low levels to control the on-off of the PMOS tube; one end of the resistor is connected to the source of the PMOS tube, and the other end is connected to the gate of the PMOS tube; the number N of the N diodes is Integer greater than 0. The circuit is used in the constant current charging and boosting discharge circuits of batteries or supercapacitor modules, which can not only prevent the leakage current from exceeding the standard and cause reverse irrigation, but also realize the precise control of the constant current charging cut-off voltage and the boosting and discharging voltage.

Description

technical field [0001] The invention relates to the technical fields of instrumentation and intelligent distribution network, in particular to a voltage self-following anti-backflow circuit. Background technique [0002] During the constant current charging process of charging the battery or supercapacitor module, if the input terminal of the constant current DC / DC chip is powered off, and there is a higher voltage at the output terminal at this time, the output of the constant current DC / DC chip will have no effect on the input. High leakage current, the leakage current will cause the constant current DC / DC chip to not work normally, such as hiccup-type repeated start, input and output direct connection, etc. Burned, or even the battery or supercapacitor module is short-circuited and exploded. Therefore, it is necessary to set up an anti-backflow circuit between the constant current charging DC / DC chip and the battery or super capacitor module to solve the above problems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 黎毅辉范律肖林松李俊汤可王锋陈岗
Owner WILLFAR INFORMATION TECH CO LTD
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