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555 Inductive switching power supply circuit

2015-01-29 10:15  
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555 Inductive switching power supply circuit
As shown in Figure 9-27, 555 and R1, R2, C1 form an astable multivibrator, the oscillation frequency is about 10kHz, duty cycle closes to 50%. VT2, VT3 are used as the switching tube to expand the current. When the shock wave is in high level, VT2, VT3 are conducted to discharge for LC ; when it is in low level, the energy storage in L provides power for load through the freewheeling diode loop. When overvoltage, DW is punctured, VT1 is saturated conducted, C is in low level, so that 555 resets and stops vibration, it plays the role of regulation and homeostasis.