Switching DC voltage stabilizer, 220/5 volts 2 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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In power supplies with a pulsed control method, the regulating element operates in a key mode, which is characterized by lower power losses. In addition, switching regulators use inductive and capacitive energy storage devices designed to convert the input DC unregulated voltage to the level required by the load.
Switching regulators have better energy characteristics and smaller overall dimensions compared to linear regulators, although they have a higher level of interference. The integrated regulator LM723 can also be used as a control circuit for the key elements of switching regulators, providing the appropriate connection of the leads and a number of external components.
The circuit of a switching regulator with an output voltage of 5 V and a load current of 2 A is shown in fig. 5.80.
The circuit contains a filter capacitor C110000 uF, 35 V; timing capacitor C2 0,1 uF; rectifier diodes VD1-VD4 50 V, 4 A; pulse power diode VD5 (1N4005); filter inductor L1 with an inductance of 1,2 mH; transistors VT1 (2N5005), VT2 (2N5153); resistors R1=2,15 kOhm (5%), R2=4,99 kOhm (5%), R3=1 kOhm; R4=1MΩ, R5=3kΩ, R6=51Ω; fuse F1 - 1 A. The output voltage of the TV transformer is 6,3 V at a rated current of 5 A.
The unstabilized input voltage in the source is formed by a full-wave bridge rectifier with a capacitive filter. Transistors VT1 and VT2 (pn-p type) are included in the circuit. Darlington and form a key regulatory element of the stabilizer.
The control input of the regulating key (the base of the transistor VT1) is connected to terminal 11 of the LM723 stabilizer, and the output of the key (the collectors of transistors VT1 and VT2) is connected to the junction point of the VD5 diode and the L1 inductor.
The output voltage is taken from the opposite output of the inductor relative to the common point ("Earth").
When mounting the source, it is necessary to monitor the coincidence of the mounting connections and the given schematic diagram.
Author: Treister R.
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