SU667960A2 - Dc voltage source - Google Patents

Description

(54) SOURCE OF CONSTANT VOLTAGE

one

The invention relates to the field of electrical and radio engineering, automatics and telemechanics and serves to protect against overloads of various power sources ...; ;; . .

Known devices for protection against overloads, sources. The power supply is protected either by breaking the oscillations of the duration modulator with locking the regulating element: from the locking bias in the stabilizer of the locking bias, or by closing the variable regulating element from the foot of the locking bias source; or by disconnecting from the load the actuator combined with the Bridge rectifier circuit. However, all these methods of protection can be applied only to particular power sources. , ... ...

According to the main author. St. N ° 5 9805G, a device for protection of power sources is known, which contains a transformer,.

 power rectifier - a bridge circuit of two diodes and two thyristors, an overload sensor and a current level control circuit. The disadvantage of this device is the long response time of the protection.

The purpose of the invention is to increase the speed of protection quickly. This is achieved by the fact that the proposed device is equipped with an accumulator capacitor, one high. the waters of which are connected to the removal of the additional winding of the transformer and the anodes of the thyristors of the power rectifier, another view through the peaijcTbp and a diode to another branch of the additional winding and through the actuating element to the anodes of the diode isolation, and the cathodes of the diode isolation are connected to the branches of the diode transformer windings.

The drawing shows a functional diagram of the described device.

A power rectifier 2 is connected to the power winding of the transformer 1, which is a bridge circuit of

diodes 3 and 4 and thyristors 5 and 6. The control electrodes of thyristors 5 and 6 are connected via diodes 7 and 8 and limiting resistor 9 to the actuator 10, which is connected to the power source 11 and connected to its sensor 12 overload connected to the block 13 current level control. The power supply 11 is connected to the load 14. A storage capacitor 16 is connected to the additional winding of the transformer 1 through the limiting resistor 15, one plate of which is connected to the power winding of the transformer through the actuator 17 and the isolation diodes 18 and 19, and the other plate is connected to the point of connection of thyristors 5. and 6 of the power rectifier 2. Diodes .18 and 19 isolation are also connected to elements 3, 5 and 4.6 of the bridge circuit.

The device works as follows.

In normal operation, the actuator 10 is closed, the actuator of the current level control unit 13 is disconnected, because the voltage removed from the overload sensor 12 is not enough to actuate the actuator. The thyristor control current 5 and 6 flows through the secondary power winding of the transformer 1, one of the diodes 3 and 4, the closed actuator 1O, the limiting resistor 9 and one of the diodes 7 and 8 depending on the polarity of the voltage on the secondary power winding of the transformer . In this mode, the thyristors work as diodes in a bridge circuit of a power rectifier, i.e. the control circuit does not pass through the load and does not depend on the nature of the response of the smoothing filter. Actuator 17 is disabled and does not affect device operation. Nako Portable capacitor 16 charge.

In the current overload or short-circuit mode, the executive unit triggers the current level control unit 13, which disconnects the actuator 1O, the open circuit and the THpHCTOj SiH 5 and 6. The actuator 17 is turned on, and the energy of the capacitor 16 enters the diodes 18 and 19 Inverts to thyristors 5 and 6. One of the currently open thyristors (depending on the polarity of the voltage on the secondary power winding of the transformer) is applied a reverse polarity voltage. It shuts down much earlier than

comes back half wave voltage. Further, the current consumed by the device in the disconnected state is limited by the resistor 15.

The introduction of a storage capacitor with an executive element and diode isolation with simultaneous connection of a capacitor to two bridge thyristors ensures that the open thyristor is switched off in time significantly

0 less than when the thyristors disconnect the reverse half-wave voltage of the secondary winding. During normal operation, the power is almost not consumed (not counting the leakage currents of the capacitor 16). In emergency mode, power consumption is limited by resistor 15.

Thus, the proposed device provides high-speed

 effective protection of the power supply regardless of the nature of the smoothing filter load.

Claims (1)

Formula from. gaining Source constant voltage auth. St. No. 598051, I differ from the fact that, in order to keep the protection fast, it is equipped with a storage capacitor, one output of which is connected to the branch of SUPPLEMENTARY, transformer windings and anodes of the thyristors of the power rectifier, another View through the resistor and the other to the other to the removal of the additional winding and through the actuating element to the anodes of the diode isolation, and the cathodes of the diode isolation are connected to the branches of the power winding of the transformer.