What is a Rechargeable Power Pack?

Charging supply Rectifier for battery charging. In the early days, an AC motor-DC generator set (also called a rotary unit) was used as a charging power source. After the 1960s, the charging power source composed of power electronic devices was replaced. Charging power often uses a single-phase (or three-phase) half-controlled rectifier circuit (composed of a thyristor and a diode, the load voltage cannot be reversed) or an uncontrolled rectifier circuit (composed of a rectifier diode without controlled kinetic energy) and an AC voltage regulator Rectifier circuit, in the DC circuit, it is necessary to use a smoothing reactor to suppress the DC current ripple and prevent the current from being discontinuous.

Charger

Rectifier for battery charging. In the early days, a rotary unit (AC motor-DC generator set) was used as a charging power source. Since the 1960s, it has gradually been replaced by a charging power source composed of power electronic devices.

There are three types of battery charging methods: Constant voltage charging method. The charging voltage is constant, and the charging current decreases as the battery voltage rises. When the charging current is zero, charging ends. Constant current charging method. During the charging process, the current is kept constant. In practical applications, a staged constant current charging method is often used. Because of the late charging, if the charging current still maintains the current value at the beginning of charging, then

Charger

Will cause a lot of bubbles and acid mist, the battery temperature rises, resulting in damage to the battery plate, reducing capacity. For this reason, the charging current should be appropriately reduced in the later stage of charging, that is, the charging current in the initial stage is large, and the charging current in the later stage is small. Constant voltage and constant current charging method. It has two characteristics of constant voltage charging and constant current charging. In the initial stage of charging, charge by constant current. When the voltage reaches to generate bubbles, then charge by constant voltage. Charging power often uses a single-phase (or three-phase) half-controlled rectifier circuit or an uncontrolled rectifier circuit plus an AC voltage regulator rectifier circuit. In the DC circuit, a smoothing reactor is used to suppress the DC current ripple and prevent the current from being interrupted. According to different charging methods, there are corresponding detection circuits and automatic control or manual adjustment circuits. Charging power supply for fixed battery floating charging generally adopts constant voltage and constant current charging method, and requires the following characteristics: high constant voltage control accuracy; DC output voltage can range from low voltage when the battery is discharged to the average charging voltage range Convenient adjustment; output voltage-current characteristics should have droop characteristics that limit overcurrent.

In addition to the above conventional charging methods, there are the following two charging methods: fixed air rate charging method. At the beginning of the charging process, high-current charging is used. When the battery discharge rate reaches a certain constant value, the gas detection element sends a control signal to reduce the battery charge current in time, so that the gas discharge rate is stable at a lower value. Constant temperature charging method. During the charging process, the temperature of the battery will rise. When the temperature reaches a certain value, it will be detected by a thermostat or a thermal element and a control signal will be issued in time to reduce the charging current and keep the temperature of the battery at a specified value.

Pulse charging and discharge depolarization fast charging methods are fast charging technologies successfully researched in the early 1950s. The charging time is shortened from tens of hours to tens of minutes by the conventional charging method. The charge-discharge current waveform of the battery in this method is shown in the figure. In addition to the charging circuit, the fast charging power supply also has a discharging circuit. The discharge circuit can use various DC static switches to make the battery directly discharge energy to R - L ; it can also use an active inverter circuit to make the battery feed the AC grid, which also has a discharge effect. In addition to the main circuit of charging and discharging, the fast charging power source must also have corresponding detection and program control trigger circuits.