A lightning-proof overvoltage protection circuit and a protection device
An overvoltage protection circuit and varistor technology, applied in the field of power supply, can solve the problems of short chip breakdown and short circuit time, lack of protection, fast breakdown and short circuit speed, etc.
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Embodiment 1
[0051] like figure 2 As shown, a lightning protection overvoltage protection circuit includes a first varistor sheet 1, a second varistor sheet 2, a transient suppression diode 3, a positive temperature coefficient thermistor sheet 4 and a lead terminal 5, the The positive temperature coefficient thermistor sheet 4 is connected in series with the transient suppression diode 3 and then connected in parallel with the first varistor sheet 1, and the series-parallel branch is connected in series with the second varistor sheet 2, A single-port combined circuit is formed, wherein the performance of the first varistor sheet 1 against surge impact is higher than that of the second varistor sheet 2 .
[0052] The two lead-out terminals 5 of the single-port combination circuit are both low thermal resistance heat conduction terminals, and the low thermal resistance heat conduction terminals are thermally coupled with the second piezoresistor sheet 2. At the same time, the low thermal r...
Embodiment 2
[0056] like image 3 As shown, the difference between this embodiment and Embodiment 1 is that only one of the two lead-out terminals 5 of the single-port combined circuit is a low thermal resistance heat conduction terminal, and the low thermal resistance heat conduction terminal is connected to the second pressure sensitive The resistor plates 2 are thermally coupled to each other.
Embodiment 3
[0058] The difference between this embodiment and Embodiment 1 is that only one of the two lead-out terminals 5 of the single-port combined circuit is a low thermal resistance heat conduction terminal, and the low thermal resistance heat conduction terminal is connected to the positive temperature coefficient thermistor sheet 4 Mutual thermal coupling (such as Figure 4 shown).
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