SU1356120A1 - Redundancy d.c.power supply system - Google Patents

Abstract

The invention relates to electrical engineering and can be used. in systems of the guaranteed power supply of radio equipment ,. in which batteries are used as emergency sources for the time of loss of mains voltage. The purpose of the invention is to improve the overall dimensions and increase the reliability of the backup power supply system with direct current. When the AC mains voltage fails, the health indication signal of the mains adjustable converter 1 disappears. The keys 8 and 10 are unlocked. A battery 5 is connected to the output terminals of the system. The thyristor key 2 is shunted by the closed contact 3 of relay 7. The thyristor key 2 is locked, which prevents the voltage drop between the battery and the output terminals of the system. When the network voltage is restored, the current flow through the first nonlinear circuit 11, the closed contact 6 and the winding 7 of the relay is terminated. After a time equal to the return time of the relay 7, pins 3 and 6 open. The battery of the torn battery 5 is disconnected and discharged from the charging device 4. 1 sludge. with)

Description

one

The invention relates to electrical engineering and can be used in systems of guaranteed power supply of radio equipment, in which batteries are used as emergency sources for the time of loss of mains voltage.

The aim of the invention is to improve the weight and size characteristics and increase the reliability of the DC backup power system.

The drawing shows a structural scheme of a backup system of direct current power supply. The system contains network regulation. Voltage converter 1, the first output terminal of which through parallel connected thyristor switch 2 and the first closing contact 3 of the relay is connected to the first output terminal of the charger 4 and the first terminal of the battery 5, the second terminal of which is connected to the second output terminal of the charging device 4 and the second output terminal of the mains adjustable voltage converter 1, the second closing contact 6 and the winding 7 of the relay. Between the second terminal of the battery 5 and the first winding of the relay 7 are connected in series the first key 8 and the first

linear circuit 9, formed, for example, 35 normal battery operation

measures, three series-connected. diodes. Between the second terminal of the battery 5 and the first output of the second closing contact 6 of the relay are connected in series the second switch 10 and the second nonlinear circuit 11 formed, for example, by two diodes connected in series. The system also contains an OR 12 element, a voltage-to-current converter 13, and a third key 14 The display indicating the health of a network adjustable converter 1, for example. control is connected to the control input of the second key 10, as well as through the OR element 12 to the control input of the first key 8. The common output of the first key 8 and the first nonlinear circuit 9 is connected to the control input of the thyristor key 2. The voltage converter 13 input is connected to the second nonlinear circuit 11, and its output is connected to the control input of the third key 14 connected between the first

3561202

the battery terminal 5 and the second input element OR 12, the first and second terminals of the relay coil 7 are connected respectively to the second terminal of the second closing contact 6 of the relay and the first terminal of the battery battery 5.

I

0 0

five

The DC backup power supply system operates as follows.

In normal operation (in the presence of an AC network), the voltage at the output of the system is equal to the output voltage of the network regulated voltage converter 1. The value of the output voltage is equal to the nominal value. In normal mode, the network adjustable voltage converter 1 also generates a health indication signal, which is fed to the control input of the second key 10 and through the OR 12 element to the control input of the first key 8 and keeps these keys in the locked state. In this case, the thyristor key 2 is locked, the winding 7 of the relay is de-energized and the first and second closing contacts 3 and 6 are open. The voltage drop across the second nonlinear circuit 11 is absent, therefore, the current at the output of the voltage converter 13 is zero, and the third key 14 is locked. So in

The torn battery 5 is disconnected from the output. Charger 4 provides a full charge of the battery 5 and the maintenance mode, in which the leakage currents are compensated, i.e. Maintain full battery capacity.

45

When the AC mains voltage fails, the health indication signal of the network regulated voltage converter 1 disappears. In this case, the first and second keys 8 and 10 are instantly unlocked. Through the unlocked first key 8, the voltage of the battery 5 is fed to the control input of the thyristor key 2 and unlocks it. The thyristor key 2 makes a connection of the battery 5 to the output terminals of the system without interruption of the output voltage, which is fast-acting. Simultaneously through the unlocked first key 8 voltage

50

3

the battery 5 is fed to the nonlinear circuit 9 connected in series to the first and the winding 7 of the relay. Under the action of the current flowing through the winding 7, contacts 3 and 6 of the relay are closed. At the same time, the thyristor key 2 is shunted by the closed contact 3 of the relay, as a result, the voltage drop between the battery 5 and the output terminals of the system is eliminated and the thyristor switch 2 is locked. the second nonlinear circuit 11 and the winding 7 of the relay, and the first nonlinear circuit 9 turns out to be locked and de-energized, because as the current flows, the voltage drop across the second nonlinear circuit 11 is smaller than the voltage drop on the first nonlinear circuit 9, Block 13 converts the voltage drop on the second nonlinear circuit 11 into a current, which unlocks the third key 14. At the same time, the control input of the first key 8 through the OR element 12 is energized, locking the first key eight.

When the mains voltage recovers, the current to the load (at the system output) begins to flow from the network controlled voltage converter 1, under the influence of which the second key 10 is locked and the first key 8 continues to be kept locked through the OR element 12. At the same time, the current flow stops through serially connected the first nonlinear circuit 11, the closed contact 6 and the winding 7 of the relay. 3 as a result of the output of the voltage converter into the current 13, the current will become zero and the third key 14 is prohibited. However, the first key 8 remains locked due to the presence of a signal indicating the health of the adjustable network converter 1. After a time equal to the return time of the relay 7, you 3 and 6 open. In this case, the battery 5 is disconnected from the output terminals of the system and remains connected only to the charging device 4, which provides additional power.

g 5 0 5 0

five

0

1204

Claims (1)

charging the battery 5 and compensating for its leakage current. DETAILED DESCRIPTION OF THE INVENTION A system for backing up electric power with direct current, comprising a network regulated voltage converter, the first output terminal of which is connected through a parallel thyristor switch and the first contact of the relay to the first output terminal of the charger and the first terminal of the battery A single terminal with a second output terminal, a network regulated voltage converter, a second contact and a relay coil, characterized in that, with the aim of improving Attributes of the characteristics and increase of the system reliability are introduced between the second battery terminal and the first terminal of the relay coil, the first key and the first nonlinear circuit consisting of three diodes connected in series, between the second battery terminal and the first output of the second contact relays - a second key and a second linear circuit connected in series, consisting of two diodes connected in series, and an OR element, a voltage-current converter and the third key, while the display of the health indication of the network regulated voltage converter is connected to the control input of the second key, and also through the OR element to the control input of the first key, the common output of the first key and the first nonlinear circuit is connected to the control input of the thyristor key , the input of the voltage to current converter is connected in parallel to the second nonlinear circuit, and its output is connected to the control input of the third key connected between the first terminal of the battery and the second input of the OR element, ne The second and second terminals of the relay coil are connected respectively to the second output of the second closing contact of the relay and the first terminal of the battery, the second output terminal of the charger is connected to the second terminal of the battery.