SU1185322A1 - Bipolar d.c.voltage stabilizer - Google Patents

Description

The invention relates to electrical engineering and can be applied in secondary power supply systems, mainly for bipolar loads that are critical to the symmetry of the supply voltage.

The purpose of the invention is to improve the reliability and expansion of functional properties by providing simultaneous operation of protection when overload is 10 ke of one of the stabilization channels.

The drawing shows a circuit diagram of a bipolar constant voltage regulator. 15

A bipolar DC voltage regulator contains two channels of different polarity, each of which consists of a regulating element 1 (2) connected in series to a power bus, made on a composite transistor and a current sensor 3 (4), measuring and amplifying node 5 (6) feedback, the output of which is connected to the control input 25 of the regulating element 1 (2 '), and the measuring input - to the output terminal 7 (8) with respect to the common bus 9, the protective transistor 19 (11), the current supply and bias resistors connected buildings in divider 12 (13) voltage.

In one locking channel has a resistor 14, additional transistors 15 and 16, different types of conductivity, and a limiting reznetor 17, in which channel the reference input of the measuring amplifier assembly with respect to a common bus is connected to a source of reference voltage and the other input channel the same ₄₀

connected to the output terminal of the opposite channel.

The device works as follows.

Each of the stabilizer channels is a continuous compensating, series-type stabilizer with an integral transistor as a regulating element. The source of the reference voltage of the channel of positive polarity is part of the measuring and amplifying node, which can be performed in micro-integrated design. The source of the reference voltage of the channel of negative polarity is a stabilized output voltage of the channel of positive polarity, which ensures in all modes the symmetry of the output voltages of both channels relative to the common bus 9.

In operating modes, the transistor 15 and the transistors 10, 11, and 16 brighten with the corresponding bias potentials. When overloaded in the positive polarity channel on the current sensor 3, the voltage drop increases. which, when reaching the threshold value, leads to the opening of the protective transistor 10, which, through the saturated transistor 15, begins to bypass the emitter junction of the regulating element 1.

At the same time, the output voltages and load current decrease in proportion to the decrease in load resistance. The negative output voltage (-) decreases simultaneously with a decrease in the positive output voltage, since the measuring and amplifying node of the negative channel monitors the change in the output voltage of the positive channel. If an overload occurs in the negative voltage channel, the protective transistor 11 opens, which creates a triggering bias on the transistor 16, the latter, in turn, proportional to the overload changes the triggering potential of the emitter of the protective transistor $ 10, reducing the output voltage of both channels and the load current .

. I

Thus, protection against overloads and short circuits is ensured simultaneously in two channels of the stabilizer when an overload occurs in one of them and the voltage symmetry is observed, which increases the reliability of the device and provides the ability to supply loads with a midpoint critical to the symmetry of the supply voltage .

1185322

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Claims (2)

A two-pole constant voltage stabilizer containing two stabilization channels, each of which consists of a series connected between the input and output terminals of the regulating element, made on a composite transistor, and a resistive current sensor, measuring and amplifying the feedback node connected to the common bus measuring input to the output terminal, and the output to the control input of the regulating element, current-setting resistor connected by one output to the intermediate basic output of the regulating element, and the protection transistor, and in one of the stabilization channels the base of the protection transistor is connected to another output of the current-generating resistor, and the reference input is measuring -amplifier relative to the common bus is connected to a voltage source, characterized in that, in order to increase reliability and extend functional properties by providing simultaneous operation of protection when one of the stabilization channels is overloaded, a bias, current limiting and locking resistors are entered into one stabilization channel of the measuring amplifier node, as well as two additional transistors of different conductivity, and a bias resistor is inserted into the other stabilization channel, while respectively, in one stabilization channel, the base of the first additional transistor, of the same type in conductivity with the protection transistor, through the current The bordering resistor is connected to the specified intermediate base terminal of the regulating element, its emitter is connected to the output terminal of this channel, and the collector is connected to the emitters of the protection transistor and the second additional transistor, the base of which is connected to the output terminal of the given channel and the common collector bus between which and the base of the transistor, the protection of this channel includes a bias resistor, and in another stabilization channel, the base of the protection transistor is connected to the output terminal, its emitter is connected to rugomu terminal voltage driving resistor and through said biasing resistor - to a common bus, and the collector - k.baze said second additional transistor and the measuring and reference input node of the amplifying channel relative to a common bus connected to the output terminal of the opposite channel 'stabilization. 1185322 2