Improvement of the voltage converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The device designed to be powered by a car battery, described in the article by V. Shangareev "Voltage Converter 12/220 V - 50 Hz" ("Radio", 1996, No. 12, p. 48), is equipped with a light indicator that signals a decrease in battery voltage to the set limit level. However, a busy driver may not notice the modest light of the LED, which is fraught with a deep discharge of the battery and the inability to start the engine after returning it to the car. Therefore, I propose a simple addition to the device, which provides automatic shutdown of the load when a specified level is reached.
The figure shows a fragment of the original scheme of the device with the details of the machine. Instead of an LED, the control electrode circuit of the trinistor VS1.1 is connected to the inverse output of the trigger DD1. Upon a signal that a predetermined voltage level is reached, the trinistor opens and turns on the winding of relay K1. Contacts K1.1 of the relay will de-energize the converter and simultaneously turn on the HL1 LED. In this mode, the machine will remain until the battery is disconnected. Once triggered, the device draws a small amount of current to keep the relay on.
The relay contacts must be designed for the maximum load current of the converter (up to 10 A), which determined the choice of the relay type - REN34, passport KhP4.500.030-01.
Author: Yu.Prokoptsev
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