SU819887A1 - Device for automatic switching -on of standby power source of users - Google Patents

Description

(54) DEVICE FOR AUTOMATIC INPUT OF BACKUP POWER SUPPLY OF CONSUMERS

voltage roll, switching unit 4, load control unit 5, consumer selection (priority) block 6, blocking element 7, switching elements 8 and consumers 9. The voltage control unit 3 kbntrol is designed to control the presence of the main source voltage and generate a control signal for block 4 switch. Switching unit 4 comprises a device for switching the power supply of consumers from the main source 1 to the backup source 2. The load control unit 5 is designed to control the load current of the backup source 2 and form a control signal for the consumer selection unit 6. The consumer selection unit 6 contains a circuit 10 for monitoring the state of the switching elements, an unequal scheme 11, a matching circuit 12 and is designed to monitor the state of the switching elements 8 (on, off), determine the least important consumer among those connected to the backup source and generate a signal transmitted through the blocking element 7 through the trip circuit to the control input of the corresponding switching element 8. The outputs of the coincidence circuit 12 are unequal and numbered in order of increasing importance consumer The signal from the coincidence circuit 12 is supplied via the consumer's channel of least importance when the control signal from the output of the load control unit 5 arrives at its control input. The blocking element 7 is designed to block the tripping signals in the mode of power supply of the installation from the main source 1.

The device works as follows.

In normal operation, when powered from the main source 1, the switching unit 4 ensures that the entire load is connected to it. In this case, the control circuit of the switching unit 4 generates a signal according to which the blocking element 7 turns off the outputs of the consumer selection unit 6 from the disconnecting circuits of the switching elements 8.

When the voltage of the main source 1 disappears or an unacceptable decrease in voltage, the voltage control unit 3 generates a signal by which the switching unit 4 switches the power supply of the consumers from the main source to the reserve one. The control circuit of the switching unit 4 produces a signal for the action of the locking element 7. The outputs of the block 6 are connected to the switching circuits of the switching

elements 8. From the signal outputs of the switching elements 8, which are in the on state, signals are output to the corresponding inputs of the circuit 10 of the unit 6. The state control circuit 10 memorizes the state of the switching elements 8. At the outputs of the circuit 10 corresponding to switched on switching elements 8, there are signals arriving at the inputs of the circuit tl of unequalities.

In the non-uniformity circuit 11, the least important consumer among those connected to the backup source 2 is determined and a signal is output to the corresponding input of the matching circuit 12. If at the time of the power switch from

the main source 1 to the backup source 2, the load power exceeds the power of the backup source, then from the output of the load control unit 5 to the control input of the matching circuit 12

control signal. At the same time, at the output of the coincidence circuit 12, corresponding to the least important consumer among those connected to the backup source 2, a signal appears, which through the blocking element 7 goes to the control input of the switching element 8 to which the specified consumer is connected. The power contacts of this switching element open and disconnect the consumer of the food community. This stops the flow of the control signal from the output of this switching element 8 to the input of the state control circuit 10. In priority block 6, circuits are prepared for issuing a trip signal of the next priority consumer.

If the load power is not sufficiently reduced, the control signal continues to be received from the output of the load control unit to the control input of the matching circuit 12. From the output of circuit 12, the match is as follows

5, a shut-off signal of the corresponding switching element 8 is issued to the consumer. In block 6, circuits are prepared for the shut-off signal of the next important consumer.

This process continues until the load power is set to a predetermined range. In the future, the device automatically eliminates the possibility of excluding disconnected consumers, if in this case the load current exceeds

5 specified value. If, when a more important consumer is turned on, the load current exceeds a predetermined value, the device will turn off the consumer, less important than the switched on one, which ensures that the load current of the backup source is maintained within the specified limits. The use of the proposed device in communication systems ensures reliable power supply of radio equipment operating in the most important areas. The proposed device can be used in power supply systems for mobile objects having reserve power sources of low power.

Claims (2)

1. USSR author's certificate number 402988, cl. H 02 J 9/06, 1969. 2. USSR author's certificate number 584390, cl. H 02 J 9/06, 1976.