The core device of the circuit is composed of an AC solid state relay and a programmable timer IC, plus a peripheral constant current source charging circuit, which is suitable for the No. 5 NiMH battery.
The electrical principle is as shown in the figure below. The whole machine consists of two parts: the timing control circuit and the constant current source charging circuit: the AC solid-state relay SPLLlO and the ICl programmable timer CD4511 form a timing control AC shutdown circuit, where S1 is the power switch: S2 For the toggle switch, the resistor R3, R4, and R5 form a charging time selection circuit, and the timing capacitor C3 determines the oscillation frequency; the transistors BG1, BG3, and BG2, BG4, etc. constitute a two-way constant current source charging circuit, and the charging current Ic=[(2V) -1.3V) / 1.8 Ω] × 1/2 = 200 mA (average value) is a pulsating current, and the batteries E1 and E2 are charged. The working process is as follows: Press S1 to turn on the power.
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The transformer T1 is energized, the secondary AC voltage is rectified by Dl~D4 bridge and filtered by the capacitor Cl to generate a smooth DC voltage as the working power supply; at the same time, the programmable timer IC2 is automatically reset, and the output of the (8) pin is Low level, AC solid state relay is turned on. T1 is also kept energized; since the base of the constant current tube BG1 is clamped by the LED1, the charging current is determined by the emitter resistor R9, and is charged to the El battery in a constant current; the other operation is also the same.
The required charging time is determined by the selection of the toggle switch S2. When the (8) pin becomes high level, the solid state relay turns off the AC power, and the LED1 and LED2 are turned off to indicate that the charging is automatically ended. The SPl110 pin is shown on the right.
The timing of the three-speed design of this machine is: 9h, 12h, 15h. It is suitable for three kinds of nickel-hydrogen batteries of 1600mAh, 1800mAh and 2000mAh currently available on the market, so that the charging time is matched with the battery capacity. The battery is charged in two series. Since the constant-current tube is driven by the half-wave pulsation, the charging of the large-capacity battery is particularly effective. When the battery is fully charged, the surface temperature should be slightly hot, about 50 °C. Otherwise, it can be considered that there is a fault in the counterfeit battery or the inner core.
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