We generally only use chargers for electric car chargers. If we want to make the charger use longer, we need to understand the principle of electric car chargers so that electric car chargers can last longer. If you want to understand the electric car charger, let's take a look at its characteristics.
Analysis of charging principle:
1. Maintenance and charging:
When the battery voltage is low (can be set, the circuit is preset to be below 9V), the charger works in a low-current maintenance charging state, and the working principle is that the potential of U1C⑨pin (in-phase terminal) is lower than that of pin ⑧ (inverting terminal) , U1C outputs low potential, and T4 is cut off. U1D 11 pin potential is about 0.18V. At this time, the charging current is about 250mA (the constant current circuit is composed of R14, U1D, T1B peripheral circuits, readers of the constant current principle, please analyze by yourself).
2. Pressure-limited float charge:
When the battery is close to being fully charged, the charger will automatically switch to the limit voltage floating charge state (the limit voltage float charge is set to 13.8V, if it is a 6V battery, the float charge voltage should be set to 6.9V). The charging current will gradually decrease from the fast charging state. After the battery is fully charged, the charging current is only 10-30mA, which is used to supplement the battery's power loss due to self-discharge.
3. Fast charging:
As the maintenance charge continues, the battery voltage gradually increases. When the battery voltage exceeds 9V, the charger switches to high-current fast charging mode, and the potential of U1C⑨ pin (non-inverting terminal) is higher than that of pin ⑧ (inverting terminal), and U1C output is high. Potential, T4 turns on, U1D 11 pin potential is about 0.48V, and the charger outputs a constant current of about 1A to charge the battery.
4. Protection and charging indication circuit:
This circuit is equipped with a reverse polarity protection circuit, which is composed of D4, U1C, U1D, T1 and peripheral components. When the battery is reversely connected, the charger limits the output current to prevent accidents. The charging instruction is composed of U1A, D7 and peripheral components. When charging, D7 lights up. After the charger enters the floating state, D7 goes out, indicating the end of charging.
The application field of the charger, the charger is widely used in various fields: model airplanes, remote control toys, mobile lighting fixtures, electric vehicles, power tools, instruments and meters. This is the principle of electric car chargers, and you need electric car chargers and so on to find Yisai Electronics. Yisai electronic products adopt advanced switching power supply technology, which are small in size, light in weight, high in efficiency, and energy-saving. The chargers are all made of aluminum alloy shell, with beautiful and generous design, stable quality, durable, fully intelligent control, easy to use, energy saving and environmental protection.