SU864273A1

SU864273A1 - Dc voltage stabilizer

Info

Publication number: SU864273A1
Application number: SU792796266A
Authority: SU
Inventors: Михаил Федорович Петровский
Original assignee: Предприятие П/Я В-8769
Priority date: 1979-07-10
Filing date: 1979-07-10
Publication date: 1981-09-15

Description

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Изобретение относитс к источникам электропитани радиоэлектронных устройств, а именно к стабилизаторам напр жени посто нного тока с защитой регулирующего транзистора по мощности рассе ни .The invention relates to electrical power sources of electronic devices, namely, DC voltage regulators with protection of the regulating transistor in terms of power dissipation.

Известен стабилизатор напр жени посто нного тока, который содержит последовательный регулирующий транзистор , в эмиттерную цепь которого включен датчик тока, параллельно коллектор-эмиттерному переходу которого подключен датчик напр же1ш , выполненный из последовательно соединенных двух резисторов, транзистор защиты, база которого подгслючена к выходу датчика напр жени , эмиттер подключен к выходу стабилизатора, а коллектор подключен к базе регулирующего транзистора .A known DC voltage regulator, which contains a series regulating transistor, into the emitter circuit of which a current sensor is connected, parallel to the collector-emitter junction of which is a voltage sensor made of two resistors connected in series, a protection transistor, the base of which is connected to the output of the sensor The emitter is connected to the output of the stabilizer, and the collector is connected to the base of the regulating transistor.

Недостатком стабилизатора вл етс малый диапазон напр жени стабилизации , что св зано с действием линейной цепи обратной св зи по и пр жению и току, образованной резисторами датчика напр жени и датчика тока, привод щим к значительному снижению тока регулирунлцего транзистора и доход щего до полного запирани стабилизатора.A disadvantage of the stabilizer is the small stabilization voltage range, which is associated with the action of a linear feedback circuit on both voltage and current produced by the resistors of the voltage sensor and the current sensor, resulting in a significant decrease in the current of the control transistor and going to complete locking stabilizer.

Мощность, рассеиваема на регулирующем транзисторе, ограничиваема цепью рбратной св зи, в диапазоне на пр жени стабилизации не посто нна, The power dissipated on the regulating transistor, limited by the circuit, in the range on the stabilization voltage is not constant,

10 измен етс от максимального до нулевого значени , что значительно снижает Эффективность схемы защиты регулирующего транзистора.10 varies from maximum to zero, which significantly reduces the effectiveness of the protection transducer of the control transistor.

Наиболее близким по технической The closest technical

ts сущности к предлагаемому вл етс стабилизатор напр жени посто нного тока, содержащий последовательный регулирую1ций транзистор, в эмиттерную цепь которого включен датчик тока, а The ts of the essence of the present invention is a DC voltage regulator, containing a series-controlled transistor, in the emitter circuit of which a current sensor is connected, and

Claims

M in parallel to the collector-emitter junction there is a voltage sensor input, a threshold element, one input of which is connected to the output of the voltage sensor, the other to the output terminal, and the output to the control node of the regulating transistor. In addition, the stabilizer contains a starting circuit on a two-base transistor f2. The disadvantages of this stabilizer are the difficulty due to the use of a special starting circuit. The purpose of the invention is to simplify the stabilizer. The goal is achieved by the fact that in a DC voltage regulator containing a series regulating transistor, the emitter circuit of which includes a current sensor, is parallel to the collector-smith terminal of the voltage sensor input, a threshold element, one input of which is connected to the sensor output the other, to the output terminal, and the output to the control node of the regulating transistor, the voltage sensor is nonlinear, with a hyperbolic characteristic. To do this, for example, the voltage sensor can be made of a chain of series-connected Zener diodes, the first and second resistors, with a parallel-connected third resistor and a diode connected in parallel with the second resistor. : The drawing is a diagram of a DC voltage regulator. The capacitor contains a series of regulating transistors 1, the emitter circuit of which includes a current sensor 2, parallel to the collector-junction transition of which voltage sensor 3 is connected, threshold element A connected by one input to the output of the voltage sensor, the other to the output output, and output to control node 5 of the control transistor. The voltage sensor contains a series-connected zener diode 6, a first resistor 7, a second resistor 8, and a third resistor 9 and a diode 10 connected in series with the latter. A DC voltage regulator operates as follows. When the stabilizer is turned on, the total voltage from the voltage sensor 3 and the current sensor 2 is supplied to the threshold element 4. At the output 34 of the corneous element 4, an electrical signal is produced, which by means of the control unit 5 regulates the conductivity of the control transistor 1. In the case the voltage from the voltage sensors 3 and current 2 does not exceed the threshold value of the threshold element 4, the stabilizer current is not limited to the protection circuit and the stabilization voltage is maintained at the stabilizer output by the control node 5 . When the voltage exceeds the threshold value, a signal appears at the output of the threshold element 4, leading to blocking of the regulating transistor 1, which leads to a decrease in the stabilizer current and a decrease in the power dissipated on the regulating transistor 1. At the same time, the voltage increases the collector-emitter junction additionally fits the control transistor 1 by increasing the output voltage from the voltage sensor 3. In view of the fact that the voltage sensor 3 has a non-linear hyperbolic characteristic with its functional dependence of the output voltage of the voltage sensor 3 on the voltage at the collector-emitter junction of the regulating transistor PR L | -v tipaV., - V out pores Vx-O where P is the power dissipated by the control transistor in the current limiting mode; , - tripping voltage across the horn element; R is the resistance of the current sensor resistor; V - voltage at the collector junction of the regulating transistor; Y.V is the voltage output of the voltage sensor, then the signal at the output of the threshold element 4 with the help of the control node 5 maintains the voltage at the collector-emitter junction and the current flowing through the regulating transistor of such a magnitude that the power dissipated at the regulating transistor is kept constant regardless of the voltage at the input and output of the stabilizer. This eliminates the locking of the regulating transistor, and therefore there is no need to use a starting circuit in voltage regulators for direct voltage, which simplifies the stabilizer and expands the range of stabilized voltages. Claim 1. A DC voltage regulator containing a series regulating transistor in the emitter circuit of which a current sensor is connected and the input of a voltage sensor connected in parallel to the collector-emitter junction, a threshold element, one input of which is connected to the output of a voltage sensor, the other - to the output terminal, and the output - to the control node of the regulating transistor, characterized in that, for the purpose of simplicity, the voltage sensor is nonlinear, with a hyperbolic characteristic.

2. A stabilizer according to claim 1, 1, of which it is. that the voltage sensor is made of a chain of series-connected zener diodes, the first and second resistors, with a parallel-connected third resistor and a diode connected in parallel with the second resistor. Sources and transformations taken into account during examination 1. Rally, Protection of a voltage regulator by means of a resistor in the feedback circuit 1973, K6. 2, Copyright Soviet USSR № 5303Z5, cl. G 05 F / 58, 197; (sweat type). J .....