SURGE PROTECTION FOR AN ELECTRONIC DEVICE

摘要

A surge protection circuit for an electronic device such as an HVAC controller. In one example, the surge protection circuit may include a first voltage clamp, a second voltage clamp, a resistor, and an output port. The first voltage clamp may provide a first clamping voltage between a power input terminal and a common terminal. The second voltage clamp may provide a second clamping voltage that is less than the first clamping voltage. The resistor may be connected in series with the second voltage clamp, and the series connected resistor and second voltage clamp may be connected in parallel with the first voltage clamp. As such, a surge current at the power input terminal may be split between the first voltage clamp and the second voltage clamp. The amount of surge current that is provided to the second voltage clamp may be set by the value of the resistor.

主权项

1. A surge protection circuit for an HVAC device, the surge protection circuit comprising:
a first varistor connected between a power input terminal and a common terminal of the HVAC device; and a first resistor component connected in series with a transient voltage suppressor diode, with the series connected first resistor component and transient voltage suppressor diode connected between the power input terminal and the common terminal of the HVAC device in parallel with the first varistor.