SU873227A1 - Direct current voltage stabilizer - Google Patents

Description

(54) DC VOLTAGE STABILIZER

one

The invention relates to electrical engineering and can be used to power electronic equipment. DC voltage regulators are known that use the transition from voltage stabilization to voltage stabilization or current limitation in case of overloads 1 and.

The closest in technical essence and the achieved result of the present invention is a DC voltage regulator, comprising: a) serial regulating transistor, a current sensor connected between the regulator emitter and the output of the stabilizer, a two-pole reference voltage source, the common output of which connected to the output of the stabilizer, the first resistive divider included in the sum of the reference and output voltages, differential amplifiers of the signals dispersed voltage and current connections, the non-inverting inputs of which are connected to the output of the stabilizer, and the inverting inputs to the outputs of the first and second resistive dividers, the OR element, the output of which is connected to the control input of the regulating transistor, and the inputs to the outputs of the aforementioned differential amplifiers 2 .

The disadvantage of it is that the power dissipated by the control transistor in the overload or short circuit mode exceeds the power dissipated in the operating mode.

ten

The purpose of the invention is to reduce the power dissipated on the control transistor in the event of an overload in a short circuit.

The goal is achieved by

15 that an RC filter, a comparator, a resistor are introduced into the DC voltage regulator, the RC filter input is connected between the output and the non-inverting input of a differential voltage-error amplifier, and the output is connected to the comparator input, the output of which is connected to an inverting input signal amplifier dissolving the current.

The drawing shows a circuit diagram of the device.

Claims (2)

The DC voltage regulator contains a control transistor 1, a current sensor 2, a two-pole voltage source, consisting of a source of positive 3 and negative 4 polarities, the first resistive divider 5 and 6, the second resistive divider 7 and 8, differential amplifiers of voltage and current error signals 10, element OR 11, delay circuit, RC filter consisting of resistor 12, capacitor 13, comparator 14, to one of whose inputs a bias voltage is applied, resistor 15, source feeding for example 16, the load 17. The voltage regulator operates as follows. If there is no overload or short circuit, the voltage at the output of amplifier 9, applied through the RC filter 12 and capacitor 13 to the inverting input of the comparator 14, is lower than the bias voltage (V) applied to the non-inverting input of the comparator 14. Therefore, at the output of the comparator of torus 14, the voltage is negative, about equal to the negative voltage (supply V) of amplifiers 9 and 10. In this case, the value of the maximum current (load is equal to () V 6 RISERS where 2, 4, 5, b, 15 are elements In drawing the current the stabilizer goes into a current stabilization mode. The amplifier 9 goes into saturation mode, the voltage at its output becomes approximately equal to the positive voltage (U) of the amplifiers. Through the resistor 1 the capacitor 13 is charged before this voltage. As soon as the voltage on the capacitor 13 becomes greater than the bias voltage V, then the comparator 14 switches, and the voltage at its output becomes approximately equal to the voltage V +, the Stabilized current (1) decreases and becomes equal to (n. v ±.) R-ID D RG. 2 This current can be ten times less current | H.VJ, Q. Power dissipation on the control transistor may be less than power dissipation in the mode of nominal operation. When the load is disconnected, the stabilizer automatically switches to the voltage stabilization mode. Claims An DC voltage regulator containing a series regulating transistor, a current sensor connected between the emitter of the regulating transistor and an output terminal, a stabilizer, a two-pole reference source, the common terminal of which is connected to the output terminal of the stabilizer, the first resistive divider connected to the sum voltage sensor current and a source of voltage, the second resistive divider included in the sum of the reference and output voltages, differential equipment Voltage and current mismatch signals, the non-inverting inputs of which are connected to the output of the stabilizer, and the inverting inputs to the outputs of the first and second resistive dividers, an OR element whose output is connected to the control input of the controlling transistor, and the input to the outputs of differential amplifiers, characterized in that, in order to reduce the power dissipation of the regulating transistor in case of overload and short circuit, an RC filter, a comparator, a resistor are introduced into it, and the RC input is tra connected between the output and noninverting input of differential amplifier signssha The error voltage, and an output connected to an input of the comparator, the output of which is connected through a resistor to the inverting input of error amplifier current signal. Sources of information taken into account in the examination 1. US patent number 3414 803, KL.323, 1968. 2. US patent number 3.303 412, cl. 323-4, 1967. f J / c n zb 13 + ir / 7 r fe 15 five