Input overvoltage protection circuit
An overvoltage protection circuit and circuit technology, which is applied in the field of circuits, can solve problems such as inability to protect subsequent circuits, increase the upper limit of input voltage, and short overvoltage working time, etc., achieve superior EMC performance, realize overvoltage protection, and simple and reliable circuits Effect
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no. 1 example
[0056] figure 2 The principle of the chopping circuit for the first embodiment of the present invention Figure 1 , including: a capacitor C201, a rectifier bridge DB201, a capacitor C202, a varistor RV201, a switching device and an energy storage module. In this embodiment, the switching device is an N-channel MOS transistor TR201.
[0057] The capacitors C201 and C202 are safety capacitors, the Vds of the N-channel MOS transistor TR201 is recommended to be above 650V, and the energy storage module selects the energy storage capacitor C203.
[0058] Both ends of the safety capacitor C201 are connected to the front-end EMC filter circuit L and N terminals, and are respectively connected to two AC input terminals of the rectifier bridge DB201: the first input terminal and the second input terminal, and the source of the MOS transistor TR201 (S ) is connected to the negative pole of the rectifier bridge DB201, the drain (D) of TR201 is connected to the negative pole of the ene...
no. 2 example
[0076] Figure 4.2 It is the principle diagram of the sampling circuit 2 of the second embodiment of the present invention, wherein the dotted box A is a stable power supply circuit, and the dotted box B is an input voltage detection circuit, and the sampling circuit includes: input voltage detection, a stable power supply circuit, a control chip U1, a voltage regulator Diodes D402 and D403, capacitor C401.
[0077] The input voltage detection circuit includes resistors R404, R403 and diode D404;
[0078] The stable power supply circuit includes resistors R401, R402 and diode D401.
[0079] There are 3 parts of the chopper circuit connected to the sampling circuit, such as figure 2 and Figure 4.2 As shown, where Vc+ is the anode of the sampling rectifier bridge DB201, and is transmitted to the sampling circuit for processing. The negative pole of the rectifier bridge DB201 outputs a Vs signal, which is used as the signal ground of the sampling circuit, and the positive p...
no. 3 example
[0086] Figure 5 is the principle of the chopper circuit in the third embodiment of the present invention Figure 1 , with the first example figure 2 The difference is that the switching device is changed from N-channel MOS transistor TR201 to P-channel MOS transistor TR202, and the connection relationship is adjusted as follows: the gate of TR202 is connected to the control signal Vg output by the sampling circuit, and the source of TR202 is connected to the rectifier The anode of the bridge DB201 and the drain of the TR202 are connected to the anode of the energy storage capacitor C203. Both ends of RV201 are connected in parallel between the source and drain of TR202. The connection relationship of other components remains unchanged. At the same time, the sampling circuit is properly adjusted and isolated.
[0087] Figure 6 is the principle of the chopper circuit in the third embodiment of the present invention Figure II , with the first example image 3 The diffe...
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