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When surge voltage or current occurs in the power port, varistor MOV1 and gas discharge tube D3
form the first level of protection to absorb larger surges. d2 is a TVS tube, mainly for the absorption of
residual voltage after the first level of protection. Since the response time of TVS is faster than that of
gas discharge tube, in order to prevent TVS from being burnt before the response of gas discharge tube,
it is necessary to connect an inductor in series between the two protection circuits to play the effect of
time delay.
D1 is a Schottky diode to realize the anti-reverse function.
6.1.3 Secondary conversion circuit
Development board other power supply, such as 3.3V, 1.8V, etc., can be obtained by 12V\5V again
step-down, the recommended circuit shown in Figure.
Room 02-04, 10/F, Block A, Building 8, Shenzhen International Innovation Valley, Dashi Road, Nanshan District, Shenzhen, Guangdong, China
Emai:
support@geniatech.com
Power supply protection circuit
Tel: (+ 86) 755 86028588
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