Electric bicycle chargers mostly use switching power supplies. Although there are many models, the circuit structure is similar. The main difference is that the selected pulse width modulation (PWM) chips are different (UC3845, UC3842, SG3524, TL494). Take Jiadeng brand charger as an example to introduce its principle and troubleshooting methods.
First, the circuit principle According to the physical mapping of the Jiateng brand charger circuit principle shown in Figure 1. The whole machine can be divided into four parts: PWM generation and push circuit, power switch conversion circuit, charge status indication circuit and AC input circuit.
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