Charger on trinistor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Charging batteries with a current not exceeding 2,25 A can be done using a trinistor device.
When a certain voltage value, set by the R2, V1, V2 circuit, is reached, the charger automatically disconnects from the battery. The exemplary voltage on the battery is compared at the beginning of each positive half-cycle, when the trinistor V4 is still closed. When a discharged battery is connected to the charger, the trinistor V4 opens at times close to the beginning of each positive half-cycle. During the negative half-cycle, the trinistor is closed.
As the batteries charge, the voltage on them increases, and the trinistor opens later, closer to the middle of the half-cycle. The trinistor closes at the end of the positive half-cycle, when the voltage on the secondary winding of the transformer T1 becomes less than the voltage on the battery. The voltage comparison takes place in the control electrode circuit of the trinistor V4.
The voltage at the output of the device depends on the parameters of the trinistor, and if it turns out to be less than necessary, the trinistor is selected.
Transformer T1 is calculated based on the value of the charging current and voltage of 20 V on the secondary winding.
See other articles Section Chargers, batteries, galvanic cells.
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