TH3122Y - Two-level battery charger with dimmer. - Google Patents

Abstract

This two-level battery charger with a dimmer indicates whether the battery is being charged. LED1 shows whether the device is operating. R2 limits the current to LED1. When R1 limits the charging current, an indicator light will illuminate when the battery reaches 80% charge, indicating that the battery is nearly full. The battery will draw less current, causing the voltage across Vo to rise, triggering the Zener diode Z1 and illuminating LED2. R3 reduces the current supplied to LED2. When fully charged, the battery draws even less current, causing the voltage across Vo to rise again, triggering the SCR to conduct current. When the SCR conducts current, LED3 lights up. R4 limits the current to LED3, indicating that the battery is fully charged.

Claims (1)

1. A two-level battery charger via a dimmer will be a 6V battery charger. A 220V power supply is fed into the transformer at terminals 1 and 2, and the voltage is reduced at terminals 3 and 4. This voltage then passes through a rectifier circuit (bridge circuit) D1, D2, D3, D4, converting AC to DC. A unique characteristic is that R1 reduces the current. During charging, LED1 indicates that the charger is working. R2 limits the current to LED1. When the charge reaches 80%, the battery draws less current, increasing the voltage across Vo. When this voltage rises sufficiently, it passes through Zener diode Z1, causing LED2 to light up, indicating 80% charge. When the battery is fully charged, the current draw decreases further, and the voltage across Vo increases again until it passes through Zener diode Z2, triggering the SCR to conduct. When the SCR conducts, LED3 lights up, indicating that the battery is fully charged.