source:Industry News Popular:adapter release time:2020-12-10 16:56:45 Article author:sznbone
The -ΔI detection circuit (45) installed on the secondary side circuit of the AC adapter (10A) will output a detection signal after detecting that the charging current (Ic) has fallen below the set current value. The voltage control circuit (42A) repeatedly executes the step of slowly decreasing the adapter voltage (V#-[ADP]) and the step of temporarily increasing the adapter voltage in response to the detection signal.
An AC adapter for charging a rechargeable battery built-in or installed in a main body is characterized by having a primary-side circuit that switches the input DC voltage applied to the primary coil of the transformer through a switch unit; The AC voltage induced on the secondary coil of the transformer is rectified and smoothed out of the secondary side circuit of the adapter voltage; the voltage control circuit that detects the change in the adapter voltage and outputs a voltage control signal; detects the flow through the secondary side circuit A constant current control circuit that outputs a constant current control signal for the charging current; a photocoupler that feeds the aforementioned voltage control signal and the aforementioned constant current control signal as a feedback signal to the aforementioned primary-side circuit; responds to the aforementioned feedback signal to perform switching control on the aforementioned switch unit The switch control circuit is characterized in that it has a detection device that is provided on the secondary side circuit and detects that the charging current decreases below the set current value before outputting a detection signal;
The aforementioned voltage control circuit repeats the operation of slowly lowering the aforementioned adapter voltage and temporarily increasing the aforementioned adapter voltage in response to the aforementioned detection signal.
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