| 摘要 |
<p>A high voltage circuit with an automatic voltage limiting power switch device serially connected therein comprises a branch with a power switch device serially connected therein, a plurality of energy storage circuits P1 to Pm, a plurality of discharge diodes Dp, a plurality of junction diodes Dq, an energy concentration diode Du, and a concentration voltage limiting circuit U. A concentration voltage limiting circuit with a low voltage is used to limit a voltage of each energy storage capacitor C, so that safe voltage limiting is implemented for each power switch device. The circuit solves the problem that serial connection, for use, of power switch devices with a withstand voltage of 3300 V or above is limited due to low withstand voltages of ordinary small packaged clamp diodes such as T0220, T0247, and the like in the prior art. A reverse breakdown voltage of a clamp diode of the circuit can be reduced by several times while a reverse recovery current is also decreased, so that the clamp diode works in a safe work area, thereby greatly improving the system reliability.</p> |
