JPH0241660A - Doubled power circuit - Google Patents

Abstract

PURPOSE:To improve the efficiency of a power supply by installing a relay short-circuiting a diode for protecting a circuit and a signal transmission circuit inhibiting the operation of a relay for a power circuit detecting previous operation start and subsequently starting its operation. CONSTITUTION:A doubled power circuit has a pair of power circuits A, B having the same function, and the power circuit A is composed of a converter 4a, a converter driver circuit 2a, and a switching element Tra, and connected to the series connection circuit of resistors 14a-16a through a doubling diode 11a and load 18. The power circuit A has an auxiliary converter 3a, and an output from the auxiliary converter is connected to an output Q from a flip-flop circuit 8a through a relay 9a. The contacts 10a, 17a of the relay 9a respectively short-circuit the doubling diode 11a and the resistor 16a. Accordingly, previous operation start is detected and the relay 9a(9b) is driven, and the relay operation of the power circuit A(B) subsequently starting operation is inhibited.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a power supply circuit with a redundant configuration, and in particular, a redundant power supply circuit designed to reduce the number of losses N due to voltage effects in diodes for protecting the circuit to be redundant. Regarding.

[Prior Art] Conventionally, when duplicating DC power supply circuits, a diode called a duplication diode was connected in series to the output side of each DC power supply circuit for the purpose of circuit protection.

[Problems to be solved] - In the conventional redundant power supply circuit described above, since the redundant diodes are connected in series on the output side, the loss due to the voltage drop in the redundant diodes is high, and heat generation becomes a problem. It is necessary to attach a heat sink to the heavy diode, which has the drawback of increasing the size of the circuit and increasing costs.

The present invention eliminates losses in =-duplex diodes;
Our objective is to provide a dual power supply circuit that improves efficiency as a power supply.

[Means for Solving the Problems] The redundant power supply of the present invention is composed of pairs of target current power supply circuits, and in the redundant power supply circuit in which a diode is connected to the output of each DC power supply circuit, each of the DC power supply circuits is connected to the A relay that short-circuits diodes, and a circuit that detects that it has started operating first and drives said relay, and also sends out a prohibition signal that does not drive relays that short-circuit diodes in other power supply circuits that started operating later. and a circuit that sets the output voltage to be higher when the diode is short-circuited.

[Example〕 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram of an embodiment of the present invention.

Since the paired power supply circuits A and B have the same configuration, the corresponding parts are numbered the same, and are distinguished by adding a to power supply circuit A and b to power supply circuit B. .

Power supply circuit A (B) has a converter 4a (4b),
It is connected in parallel to the power supply 1. Converter drive circuit 2a (2b) is connected to switch element Tra (Trb) of converter 4a (4b), and converter 4a (4b)
The output of
) via resistors 14a, 15a, 16a (14b.

15b, 16b) and the load 18. In addition, the power supply circuit A (B) has an auxiliary core y<-
3a (3b) and this auxiliary converter 3
a, (3b) c7) are connected to the Q output of the flip-flop circuit 8a (8b) via the output beam L/-9a (9b). The S input of the flip-flop circuit 8a (8b) is connected to the capacitor 6a (6b), and the Q output of the flip-flop circuit 8a (8b) of the other power supply circuit is input to the R input, and the Q output of the flip-flop circuit 8a (8b) of the other power supply circuit is connected to the capacitor 6a (6b). Connected to converter output ground.

Relay 9a (9b) (7) Contact 10a (10b)
17a (17b) are the redundant diodes 11a (
llb) and the resistor 16a (16b). Furthermore, the two inputs of the error amplifier 12a (12b) include a resistor 15a (15b) and a reference voltage N15a (
13b) is connected, and the output of the error amplifier 12a (12b) is input to the converter drive circuit 2a (2b).

Next, the operation of the redundant power supply circuit of this embodiment will be explained.

Now, if power supply circuit A starts operating first, -17
/<-The output voltage of the output voltage 4a and the output voltage of the auxiliary converter 3a rise, and the S voltage of the flip-flop circuit 8a is set to H. On the other hand, since power supply circuit B is not yet in operation, the Q output of flip-flop circuit 8b is L. Therefore, the R output of the flip-flop circuit 8a of the power supply circuit A remains L, the Q output becomes H, the relay 9a connected to the Q output is driven, and the contacts of the relay 9a, 10a, 17a makes up.

When the contact 10a of the relay 9a is made, the duplex diode lla is short-circuited, and when the contact 17a of the relay 9a is the meter and the resistor 16a is short-circuited, the voltage value detected by the resistor 15a becomes smaller. Therefore, it is determined that the output voltage of the converter 4a has decreased, and the output voltage of the power supply circuit A increases due to the differential of the converter drive circuit 2a due to the output of the error amplifier 12a.

After that, even if the power supply circuit B starts operating, the Q output of the flip-flop circuit 8a of the power supply circuit A is H, and the R input of the flip-flop circuit 8b of the power supply circuit B remains H. Even if it changes from L to H, the Q of the flip-flop circuit 8b.

The Q outputs maintain the H and L states, respectively, and the relay 9b is not driven. Therefore, the relay 10a starts its operation first, and
The power supply circuit A in which 17a is connected will supply power to the load 18.

If an abnormality occurs in power supply circuit A and the operation is stopped, the power supply from converter 4a and auxiliary converter 3a is stopped, contact 10a of relay 9a.

17a breaks, and the operation of the flip-flop circuit 8a also stops. Therefore, the Q output of the flip-flop circuit 8a becomes L, and the flip-flop circuit 8b of the power supply circuit B
The R person power also changes to L. Then, the Q and Q outputs of the flip-flop circuit 8b each change to H, and the relay 9
b is driven, contacts 10b and 17b of relay 9b are made, duplex diode llb and resistor 16b are short-circuited, the output voltage of power supply circuit B becomes high, and power is supplied from power supply circuit B to load 18.

Even if power supply circuit B starts operating first, each circuit operates in the same way as described above.
Power is supplied to the

[Effects of the Invention] As explained above, in the present invention, each dual-configured DC power supply circuit has a relay that short-circuits a diode for circuit protection, and a relay that detects that it has started operating first and drives the relay. However, by having a circuit that sends a signal to prohibit the operation of the relay of the power supply circuit that starts operating later, and a circuit that increases the output voltage of the power supply circuit in which the diode is short-circuited, the duplex circuit is protected. This has the effect of eliminating loss due to voltage drop in the diode and improving power supply efficiency.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a duplex power supply circuit according to the present invention. 1: Power supply 11a, llb:=-duplex diode 2a, 2b: Converter drive circuit 12a, 12b: Error amplifier 3a, 3b: Auxiliary converter 13a, 13b: Reference voltage source 4a, 4b: Converter 18: Load 5a, 7a , 14a, 15a, 16a 5b, 7b, 14b, 15b, 16b: Resistors A, B: Power supply circuits 6a, 6b: Capacitors 8a, 8b: Flip-flop circuits 9a, 9b: Li -

Claims (1)

[Scope of Claims] In a redundant power supply circuit consisting of a pair of DC power supply circuits and having a diode connected to the output of each DC power supply circuit, each of the DC power supply circuits starts operating first with a relay that short-circuits the diodes. A circuit detects that the relay has been short-circuited and drives the relay, and also sends out a prohibition signal that does not drive the relay that short-circuits the diode of another power supply circuit that starts operating later. A redundant power supply circuit characterized by having a circuit that is set to a high level.