SU1418676A1 - Secondary power supply source - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply devices of direct current electric consumers. The purpose of the invention is to expand the scope and enable low-impedance load start-up by briefly shifting the overload protection trigger threshold in start-up modes. When the stabilizer is turned on, the regulating element 13 opens, and the protection transistor 2 is locked by voltage bias on the resistors 4 and 9. When the output voltage reaches the required level, the threshold element 6 is triggered. The element 11 connects the element 6 through the damping resistor 5 to the stabilizer input, thereby keeping it in the actuated state. With overcurrent protection is triggered. The stabilizer automatically returns to stabilization mode after the overload factor has disappeared. 1 il. lO (L

Description

Output

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The invention relates to electrical power engineering and can be used in the power supply devices of a simple electrical current.

 The purpose of the invention is to expand the field of application and to enable the low-impedance load to be started by briefly shifting the processing threshold from overload in start-up modes.

I The drawing shows the functional electrical circuit of the secondary power supply source.

I Source of the secondary power supply ckiflepxHT automatic control unit 1, protection transistor 2, two-terminal three-terminal stabilizer, bias resistor 4, one output, K, T9 is connected

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water (one of the intermediate output pins), block 1, and the other with one of the input pins of the two-terminal 3 and the base of transistor 2, the emitter of which is connected to the output terminal, damping resistor 5c in parallel with the relay a delay capacitor 7 connected through a separation diode 8 at the source output), a second bias resistor 9 connected between the common terminal and the second output terminal two-way. busker 3, disconnecting the Executive element 10, connected between the second output of the resistor 4 and the second output 35 output of the two-terminal 3, the closing actuator 11 connected between the cathode of the separation diode 8 and

one pin of the resistor 5, the other pin of which is connected to the input pin. 40 A RC load 12 is connected to the source output. Block 1 consists of a regulating element 13 on a composite transistor with a current sensor, an output voltage divider 14, a reference voltage source 15, and a measuring and amplifying node 16.

When the source of the secondary power supply is turned on, the regulating element 13 is opened by the signal of node 1b, the input of which receives the voltage of the reference source 15, while the protection transistor 2 is locked by shifting the voltage from resistors 4 and 9. After charging the capacitor 7 to a voltage value ,

 the corresponding threshold of element 6, the latter generates the inclusion of actuators

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Yu and 11, as a result of which the opening element 10 opens the short circuit of the output pins of the current-stabilizing two-pole 3, and the closing actuator 11 connects the element 6 through the resistor 5 to the source input, so that it keeps the elements Yu and 11 in the On mode without affecting further operation of the secondary power source. Isolation diode B provides charge for capacitor 7, switching on element 6 at start-up, and cutting off the output circuit from the input after connecting element 11 to the power supply source of element 6.

The protection trigger threshold after starting is kept unchanged when adjusting the output voltage due to a stable locking bias on resistor 4 from two-port 3. Since during start-up, element 10 shunts two-pole 3 leads, the protection threshold determined by voltage on resistor 9 is shifted into zone of current permissible pulse overload of the regulating element. 13, which provides a reliable start for a low-impedance load.

In case of overloads, the protection transistor opens and, acting on the control system of the block 1, reduces the current of the regulating element 13, the output voltage decreases, the output-resistance of the two-pole 3 increases, which eventually locks on the output and ensures maximum saturation of the transistor 2, which in turn, it provides a short-circuit current that is significantly less than the tripping threshold of the protection.

When the overload is removed, the secondary power source automatically returns to the operating state.

Thus, short-term placement of the protection triggering threshold in triggering modes ensures reliable starting of the power supply to a low-resistance load, including a capacitive load, which expands its range of application, while ensuring the minimum possible short-circuit currents and auto return device.

Claims (1)

Invention Formula A secondary power source containing an automatic unit, an adjustment with a regulating element and a measuring-amplifier unit, a protection transistor, a current-stabilizing two-pole and a first bias resistor, one output of which is connected to the signal output of the automatic control unit and the other the output pins of the current-stabilizing two-pole device and the base of the protection transistor} 15 whose emitter is connected to the output terminal, and the collector is connected to the control output of the automatic regulating unit and the input terminals of the current-stabilizing bipolar 20 are connected respectively to the output terminal and the common busbar, characterized in that, in order to expand the field of application and 25 enabling a low-impedance load by short-term displacement in the start-up modes of the threshold of overload protection, a delay capacitor, a damping resistor, a threshold relay element, a disconnecting and closing actuator, a separation diode and a second bias resistor connected between the common busbar and another output terminal of the current-stabilizing two-terminal device, parallel to the output terminals of which the disconnecting actuator is connected, a threshold relay element about it is connected to the common terminal schine and the other through a separating diode - to the output terminal, through closing and actuating element blanking resistor - to the input terminal, and a delay capacitor connected in parallel to the relay threshold element.