SU1524129A2 - Standby dc power supply system - Google Patents

Abstract

The invention relates to the electrical industry and can be used in uninterrupted power supply systems. The purpose of the invention is to improve the quality of the output voltage. In normal operation (in the presence of an AC mains voltage), the output voltage of the system is equal to the output voltage of the mains adjustable voltage converter 1. At the same time, the battery 5 is disconnected from the output and charged by the charger 4. When the voltage drops A network thyristor switch 2 connects the battery 5 to the output terminals, then the switch 2 is shunted, and the switching-off voltage is applied to the remote turn-on input of the charger 4. After the power supply is restored, the battery remains connected to the output terminals for some time, i.e. it operates in a buffer with adjustable transducer 1. The system eliminates the dips in the output voltage when the mains voltage is restored. 1 il.

Description

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The invention relates to electrical engineering, can be used in systems of guaranteed power supply, in which batteries are used as emergency sources, for the time of loss of mains voltage and is an improvement of the invention. St. No. 1356120,

The aim of the invention is to improve the quality of the output voltage.

The drawing shows a diagram of the system.

The redundant power supply system of the GOKOM constant contains a network adjustable voltage converter 1, the first output terminal of which is connected through a parallel connected thyristor switch 2 and the first short contact 3 of the relay is connected to the first output terminal of the charger A and the first terminal of the battery 5, second terminal which is connected to the second output terminal of the charging device 4 and the second output terminal of the network adjustable voltage converter 1, the second closing contact 6 and the winding 7 relays. Between the second terminal of the battery 5 and the first output of the winding 7 of the relay, the first switch 8 connected in series and the first nonlinear circuit 9 formed, for example, by three diodes connected in series. Between the second terminal of the battery 5 and the first terminal of the second closing contact 6 of the relay, the second switch 10 and the second nonlinear circuit 11, formed, for example, are formed by two diodes connected in series. The system also contains an OR 12 element, a voltage-to-current converter 13, a third switch 14, a third non-linear circuit 15 formed, for example, from the parallel connection of a current limiting resistor and a diode, and a storage capacitor 16. The display indicating the health of the network adjustable voltage converter 1 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

thyristor switch 2. The input of the voltage-to-current converter 13 is connected to the second nonlinear circuit 11, and 5 its output is connected to the control input of the third key 14 connected between the first terminal of the battery 5 and the second input of the OR element 12. the coils 7 of the relay are connected respectively to the second output of the second closing contact 6 of the relay and the first terminal of the battery 5. One-third is non-linear circuit 15 and accumulative

5, the capacitor 16 is connected in series and connected between the common terminal of the second key 10 and the second non-linear circuit 11 and the second terminal of the relay, and the common terminal of the third key

0 14 and the second input of the element OR 12 is connected to the input of the remote switch-on of the charging device 4. The system of redundant power supply with direct current operates in the following manner.

In the normal mode of operation, in the presence of an AC mains voltage, the voltage at the output of the system is equal to the output mains voltage

0 adjustable converter 1 voltage The value of the output voltage is equal to the nominal value. In normal mode, the network adjustable converter 1

5, the voltage also generates a health indication signal, which is fed to the control input of the second key 10 and through the IPD element to the control input of the first key 8 and

0 keeps these keys locked. In this case, the thyristor key 2 is locked, the winding 7 of the relay is de-energized and the first 3 and second 6 make contacts are open. There is no drop of voltage 5 on the second nonlinear circuit 11, therefore, the current at the output of the voltage converter 13 is zero, and the third key 4 is locked. So in normal

The mode of operation of the 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. preservation of capacity of the battery; 5.

When the AC mains voltage fails, the signal disappears.

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indication of the health of the network adjustable voltage converter 1. In this case, the first 8 and second

10 keys are instantly unlocked. Through the open first key 8, the voltage of the battery 5 is fed to the control input of the dimmer key 2 and unlocks it. The janitor key 2 performs a quick- | Q operating, without interruption of the output voltage, connecting the battery 5 to output terminals of the system. At the same time, the voltage of the battery 5 is supplied 15 through the unlocked first key 8 to the series-connected first

the nonlinear circuit 9 and the winding 7 of the relay and through the unlocked second CLLC 10 to the third connected 20 nonlinear circuit 15 and the storage capacitor 16. The storage capacitor 16 is charged almost to the voltage of the battery 5 through the current limiting resistor of the third nonlinear circuit 15. Under the action of the current flowing through the winding 7, the contacts 3 and 6 of the relay are closed. In this case, the thyristor switch 2 is shunted to close the contact of the relay 3, 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. When the contact 6 is closed, the relay begins to flow through the serially connected second switch 10, the second non-linear circuit 11 and the winding 7 of the relay, and the first linear circuit 9 Q turns out to be locked and de-energized, because as the current flows, the voltage drop across the second non-linear circuit 11 is less than the drop n direct voltage on the first non-linear circuit 9. The block 13 converts the dc voltage drop across the second nonlinear circuit

11c current, which unlocks the third key K. At the same time on the control

the input of the first key 8 through the element JQ OR 12 and the input to the remote switch on the charger 4 is directly supplied with a voltage that locks the first key 8 and turns off the charger 4.

When the network voltage is restored, the indication signal and the validity of the network controlled voltage appear.

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Converter G voltage, under the influence of which the second key 10 is locked, and the first key 8 continues to detain locked through the element OR 12. However, for some time current continues to flow through the series-connected second nonlinear circuit 11, the closed contact 6 and the winding .7 relay , from the charged storage capacitor 16 through the diode of the third nonlinear circuit 15.

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As a result, the battery 5 remains connected to the output contacts of the system for some time after the restoration of the mains voltage, during which all internal transients associated with the restoration of the mains voltage and the setting of the output voltage of the network controlled converter 1 are guaranteed to end. . There is some time in the system when the battery 5 is in the buffer with the network adjustable transducer 1. At the same time, the charging device 4 is kept still off, otherwise the voltage release is possible at the output of the system when it is underloaded. , the final value of the charging voltage of the battery. After the discharge of the storage capacitor 16, the current is stopped through the series-connected second Nonlinear circuit 11, the closed contact 6 and the winding 7 of the relay. As a result, at the output of the voltage-to-current converter 13, the current becomes zero, and the third key 14 is locked. At the same time, the first key 8 remains locked due to the presence of a signal indicating the health of the network controlled transducer 1, and the charging device 4 is turned on. After a time equal to the recovery time of the relay to the initial state, the first 3 and second 6 contacts are opened. 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 the charging of the battery 5 and the compensation of its leakage current.

Claims (1)

Claims of the system of backup power supply by direct current by author. St. W 1356120, characterized in that, in order to improve the quality of the output voltage, a third nonlinear circuit is introduced, formed from a parallel connection of a resistor and a diode, and a storage capacitor, and the charging device i the remote start input, the third non-linear circuit and the storage capacitor are connected in series and connected between the common output of the second key and the second non-linear circuit and the second output of the relay coil, and the common output of the third key and the second input of the OR element . Compiler G.Vedeneev Editor G.Gerber Tehred M.Hodanich Proofreader M.Maksimitinets Order 7052/54 Circulation 608 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., 5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Subscription