SU826303A1 - Dc voltage stabilizer - Google Patents

Description

I

The invention relates to electrical engineering and can be used to power electronic equipment.

: Known voltage regulator (DC), containing a regulating node on the transistors, amplifying and measuring nodes, the compensation circuit of the output voltage when changing our) base of the emitter of the regulating transistor ji.

Its drawbacks are high output resistance and low thermal stability of the output voltage.

Also known is a DC voltage regulator containing a regulating node on a transistor of different conductivity type, the emitter of the power transistor being connected to the output terminal of the stabilizer) collector - on one side through a current sensor to the output terminal and through a voltage divider of the current sensor to the base of the matching transistor, the collector of which is connected to the base of the power transistor, and the emitter is at the midpoint of the voltage divider of the regulating node, an amplifying trazistor with conductivity similar to that of th transistor, an emitter connected to the output terminal, the collector - to the base of the matching transistor, and base - to the output of the reference voltage source 2,

The disadvantage of it is the low thermal stability of the output voltage when the temperature of the power transistor changes.

The purpose of the invention is to increase the thermal stability of the output voltage when the temperature of the power transistor changes.

Claims (2)

The goal is achieved by connecting the base and collector of the power transistor through resistors to the base of the amplifying transistor, which is connected to its emitter through a resistor. The drawing shows the principal stabilizer circuit. The device contains a regulating node, which is executing on the power component I and 2 and matching 3 transistors of different conductivity types. The collectors of transistors 1 and 2 are connected via resistors 4 and 5 to the output terminal 6 of the stabilizer, and the emitter of transistor 1 is connected to output terminal 7. The base of the transistor 3 is connected to the output of voltage divider 8 and 9, separating to the cell on the current sensor 4 to create a positive feedback on load current. The emitter of the transistor 3 is connected to the output of a divider 10 and a voltage discharged at the regulating node to create a compensating negative connection by the deviation of the supply voltage. Vase amplifying transistor 12 through resistors 13 and 14 is connected to the base and collector of transistors 2 and, respectively. On the resistor 15, the control voltage of the transistor 12 is created. The reference voltage source can be made on the Zener diode 16 and the limiting resistor 17 or on the resistor 18 connected to the output of the current stabilizer 19, fed from the input of the stabilizer (pins 6 and 20). Resistor 5 It is used to reduce the scattering power of transistor 2, and the resistor 21 is the power supply dp of transistor 12. In addition, the stabilizer contains capacitors 22 and 23 The stabilizer works as follows. As the temperature of transistors 1 and 2 increases due to the power dissipated, the current of the adjustable transistors 1 and 2 increases, which increases the output voltage. At the same time, the base-emitter voltage drop of the transistor 1 and 2 decreases, which through a resistor 13 leads to a decrease in control Voltage at the input of transistor 12 (at 34 resistor 15) ultimately to a decrease in the collector current of transistors 1 and 2, thereby compensating for the increase in current due to the heating of transistors 1 and 2. At the same time, a signal is sent to the base of transistor 12 tricky feedback on the load current through the resistor 14 due to the heating of the transistors, thereby providing a more complete compensation for the measurement of the output voltage. The degree of compensation is determined by the values of the resistances of the resistors 13-15, which are selected during adjustment. Claims An DC voltage regulator containing a regulating node on transistors of different conductivity types, the emitter of the power transistor connected to the output terminal of the stabilizer, the collector - from one side through the current sensor to the output terminal and, through the voltage divider of the current sensor to the matching base transistor, the collector of which is connected to the base of the power transistor, and the emitter - with the middle, the point of the voltage divider of the regulating node, an amplifying trazistor with conductivity similar to the power transistor, the emitter K is connected to the output terminal, the collector to the base of the transistor and the base to the output of the reference voltage source, characterized in that, in order to increase the thermal stability of the output voltage when the temperature of the power transistor changes, its base and collector through resistors connected to the phase of the amplifying transistor, which through a resistor is connected to its emitter. Sources of information taken into account in the examination 1. Electronics, 1960, p. 52-59. 2. USSR author's certificate in application And 2500223, cl. 05 F 1/56, 1976.