Drive circuit capable of quickly switching off depletion type switching element
A technology of depletion switches and switching devices, which is applied in the direction of instruments, electrical components, and adjustment of electrical variables, etc., to speed up the turn-on speed, ensure reliability, and solve the effects of fast turn-on and fast turn-off
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[0016] Example 1
[0017] See figure 1 , The driving circuit consists of a P-channel enhancement type switching device Q1 (hereinafter referred to as P-channel device) and an N-channel enhancement type switching device Q2 (hereinafter referred to as N-channel device) and connected to the gates of the two switching devices The above resistors R1 and R2, the drain D of the P-channel device Q1 is connected to the drain D of the N-channel device Q2, and the source S of the P-channel device Q1 is directly connected to the power supply VCC of the driving circuit , The source S of the N-channel device Q2 is grounded, the gate G of the P-channel device Q1 is connected to the drive control signal input terminal A through its gate resistance R1, and the gate of the N-channel device Q2 passes The gate resistor R2 is connected to the drive control signal input terminal A, and the control signal input terminal A is connected to the signal output terminal of the external control drive circuit ...
Example Embodiment
[0020] Example 2
[0021] See figure 2 In this embodiment, on the basis of embodiment 1, a diode D1 is connected in parallel with the gate resistor R1 of the P-channel enhancement type switching device Q1, and the cathode of the diode D1 is connected to the gate of the P-channel enhancement type switching device Q1 , Its anode is connected to the input terminal A of the control signal, another diode D2 is connected in parallel with the gate resistor R2 of the N-channel enhancement type switching device Q2, and the anode of the diode D2 is connected to the N-channel enhancement type switching device Q2 The grid is connected, and its cathode is connected to the input terminal A of the control signal.
[0022] Its working principle is: when the drive circuit 1 is controlled to output a high level, the diode D1 is turned on, the high level signal is quickly added to the gate of the P-channel device Q1 through the diode D1, so that Q1 is quickly turned off; at the same time, The diode...
Example Embodiment
[0025] Example 3
[0026] See image 3 In order to further improve the safety and reliability of the driving circuit, a current limiting resistor R3 is connected in series with the source of the P-channel enhanced switching device Q1 to limit the maximum current flowing through the switching device Q1.
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