Power supply with automatic charger on the comparator, 220/4 volts 0,1 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The power supply unit is intended for power supply from a 220 V network with a voltage of 4 V of a low-power load (current not exceeding 100 mA) and recharging three batteries of the NKGTS-0,45 or NKGTS-0,5 type with automatic shutdown of the charge mode.
Fig.1 (click to enlarge)
When the unit is connected to the network, the green LED lights up if there is voltage. The battery charging process is controlled by the glow of the red LED (switch SA1 must be on). While the charging process is in progress, it will be constantly on, and at the end of the charge, the LED starts blinking and the interval of its glow will be less than a pause,
The circuit automatically monitors the charging process and eliminates damage to the batteries. If the unit is used only to power the device, then the charger can be turned off by switch SA1.
Compared to similar schemes published in the literature, this one contains fewer radioelements and is easier to manufacture.
The required output voltage of the power supply is set by resistor R2. The device is configured to set the charge current to 45 mA with resistor R4 from a range of 15, 18, 20 ohms.
For tuning, instead of batteries, a 2 Ohm resistor with a power of at least 3 W is connected to the contacts X2 / 2 and X68 / 1 in series with a milliammeter. In this case, the HL2 LED should be constantly on. After performing this operation, the operation of the comparator DA2 is checked. Why should a 2 Ohm resistor (3 W) be connected to the contacts X2 / 2 and X150 / 0,5 in parallel with the oscilloscope. The minimum voltage on the diagram is set by the ratio of resistors R8 and R9.
Structurally, the power supply unit is made on a single-sided printed circuit board, placed in a housing from a standard source of the BP2-3 type, designed to power microcalculators. A network transformer of the T8-220-50 type was also taken from the same source. When using a transformer of another type, its secondary winding must be designed for a voltage of 12 ... 15 V at a load current of 200 mA. LEDs HL1 and HL2 are attached to the top cover of the housing with glue. Plug X1 is made on the base of the body, and X2 is connected to the body with a wire about 1 m long.
Ris.2
Inside the case, a heat-dissipating plate is attached to the transistor VT1. The resistors used can be of any type, capacitors C1 ... C- - type K50-16 or similar small-sized, microswitch SA1 - type PD-9-2. Transistor VT1 can be replaced with KT814B.
When using the above parts, the dimensions of the entire device do not exceed 60x60x50 mm (Figure 5.19).
To charge batteries of another type or a larger number of them, it is necessary to set the appropriate rated charge current (R4), upper (R2) and lower threshold (R8) of the comparator operation.
See other articles Section Power Supplies.
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