An output overvoltage protection circuit
A technology to protect circuits and output overvoltage, which is applied in the direction of emergency protection circuit devices, electrical components, and measurement of electrical variables. It can solve problems such as high circuit requirements, inaccurate voltage division ratios, and inaccurate voltage values, and reduce circuit complexity. The effect of reducing the speed requirement and accurate pressure division
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[0026] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.
[0027] Such as Figure 5 As shown, the present invention is an output overvoltage protection circuit, which includes: a voltage detection module 1 , a sample and hold module 2 and a hysteresis comparator CMP1 .
[0028] Specifically, the voltage detection module 1 includes: a first resistor R1, a second resistor R2, a high-voltage isolation transistor (which is specifically an NMOS transistor) HVM1 and a first resistor R1 connected in series between the switch node SW of the external boost chip and the ground. The three resistors R3 also include a coupling capacitor C1 connected in parallel to both ends of the second resistor R2, wherein:
[0029] The substrate of the first resistor R1 is an N well, and its substrate is connected to the switch node SW;
[0030] The substrate of the second resistor R2 is a P well, and the substrate is grounded;
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