Published:2011/7/8 3:22:00 Author:Fiona | Keyword: Typical half bridge type, electric bicycle battery charger | From:SeekIC
Discharge switch is a breakover of transistor Q6, Q6, its collector and emitter make the storage battery short out, storage battery discharges. Q6 is off, the storage battery restores charge.Q5 and Q6 aredirect coupling, commonly known as Darlington. Q6 is controlled by loading negative pulses and the oscillator. Loading negative pulse control is formed by the C and D of the IC3. D is connected as inverter ,only when the both inputs of C are high level, ③ pin is low level, it is opposite through the D to make the Q6 breakover to discharge for the storage battery.The ② feet of C comes from per second 1 (pulse width 3ms) positive pulse of the multivibrator ,the ① feet of C comes from the ① feet of two-phase current detection circuit IC2.When constant current is charging, ① pin is high level. At this point, the negative pulse is applied.
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