A secondary power supply input and distribution control circuit

Abstract

The present invention discloses a secondary power input and distribution control circuit in the field of secondary power supply, including a power transfer control circuit and a power failure recovery control circuit. The power transfer control circuit includes relays K1, K2 and a switch tube Q1; the power failure recovery control circuit includes relays K3, K4 and a switch tube Q2; the input end of relay K2 is connected to the switch tube Q1 and relay K3, and is configured to be connected to the ground after the switch tube Q1 is turned on, and to be open after the switch tube Q2 is turned on; the output end of relay K1 is connected to the first power supply end, and the input end is respectively connected to the power bus and the output of relay K2, and is configured to maintain the same on-off state as that of relay K2; the present invention can realize the dual power supply power transfer function and power failure recovery function, and can realize the shutdown of the first power supply end and the recovery of the second power supply end.

Description

Technical Field

[0001] The invention relates to the field of secondary power supply, in particular to a secondary power input and distribution control circuit. Background Art

[0002] Secondary power components are widely used in electronic systems in aerospace, aviation, and other fields. For example, high-reliability electronic equipment systems typically have two power supply interfaces: a ground power supply and a system power supply. Secondary power components require control circuits designed to meet the diverse power supply and distribution requirements of the system, enabling power transfer and power recovery.

[0003] Currently, the secondary power supply and distribution control circuit has separate transfer and power recovery functions. The transfer function is implemented using a signal control relay and a power relay, both connected in series to the main circuit; the power recovery function is implemented using a signal control relay and a power relay, both connected in series to the main circuit. This design is complex, the two functions don't work together, and switching times are long. Furthermore, electromagnetic relays are often used, which have low power output and are bulky. Summary of the Invention

[0004] The purpose of the present invention is to provide a secondary power input power distribution control circuit, which can realize the dual power supply transfer function and power failure recovery function, so that it can meet the use requirements of the system power supply end.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A secondary power input and distribution control circuit includes a power transfer control circuit and a power failure recovery control circuit. The power transfer control circuit includes relays K1, K2 and a switch tube Q1. The switch tube Q1 is configured to be turned on to ground after receiving a power transfer signal; the power failure recovery control circuit includes relays K3, K4 and a switch tube Q2. The switch tube Q2 is configured to be turned on to ground after receiving a power failure recovery signal; the input end of the relay K2 is connected to the switch tube Q1 and the relay K3, and is configured to be turned on to ground after the switch tube Q1 is turned on, and to be open after the switch tube Q2 is turned on; the output end of the relay K1 is connected to the first power supply end, and the input end is respectively connected to the power bus and the output of the relay K2, and is configured to maintain the same on-off state as the relay K2; the input end of the relay K3 is respectively connected to the power bus and the output of the relay K4, the input end of the relay K4 is connected to the switch tube Q2 and the second power supply end, and is configured to be turned on to ground after the switch tube Q2 is turned on.

[0007] In some embodiments, the negative output terminal of the relay K1 is connected to the power bus through an anti-reverse circuit, and the positive output terminal is connected to the first power supply terminal; the positive input terminal of the relay K1 is connected to the power bus through a current limiting resistor, and the negative input terminal is connected to the negative output terminal of the relay K2.

[0008] In some embodiments, the anti-reverse circuit includes parallel diodes D1 and D2, wherein the anodes of the diodes D1 and D2 are connected to the negative output terminal of the relay K1, and the cathodes are connected to the power bus.

[0009] In some embodiments, the output negative terminal and the input negative terminal of the relay K2 are commonly connected to the power transfer control terminal and the output terminal of the switch tube Q1, and the controlled terminal of the switch tube Q1 is controlled by the power transfer signal; the output positive terminal of the relay K2 is grounded, and the input positive terminal is connected to the output negative terminal of the relay K3 through a current limiting resistor.

[0010] In some embodiments, the positive input terminal of the relay K3 is connected to the power bus through a current limiting resistor, the positive output terminal is connected to the power bus, and the negative input terminal is connected to the positive output terminal of the relay K4. The output terminal of the relay K3 is turned on when there is no input signal.

[0011] In some embodiments, the positive input terminal of the relay K4 is connected to the second power supply terminal through a current limiting resistor, and the negative input terminal and the negative output terminal are commonly connected to the power failure recovery control terminal and the output terminal of the switch tube Q2.

[0012] In some embodiments, an anti-reverse circuit is connected between the second power supply end and the power bus.

[0013] In some embodiments, the anti-reverse circuit includes diodes D3 and D4 connected in parallel, wherein the anodes of the diodes D3 and D4 are connected to the second power supply terminal, and the cathodes are connected to the power bus.

[0014] In some embodiments, the relays K1 to K4 are solid-state relays.

[0015] In some embodiments, each of the relays K1 to K4 has two sets of input terminals and output terminals.

[0016] Beneficial effects: The present invention can realize the dual power supply switching function and the power failure recovery function. The two functions interact with each other. Under the action of the power switching control signal, the second power supply end can be switched to the first power supply end; under the action of the power failure recovery signal, the first power supply end can be shut down and the second power supply end can be restored. The present invention only uses one power relay, which reduces the power loss of the present invention, and the circuit structure is not complicated and the switching speed is fast. The relay is preferably a solid-state relay, which can also make the present invention have the characteristics of high reliability, high power, miniaturization, etc., and is more suitable for various secondary power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the circuit of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1 A secondary power input and distribution control circuit includes a power transfer control circuit and a power failure recovery control circuit. The power transfer control circuit includes relays K1 and K2 and a switch Q1. Switch Q1 is configured to conduct to ground upon receiving a power transfer signal. Specifically, in some embodiments, switch Q1 can be configured as an NMOS transistor and conduct when the power transfer signal is high.

[0020] The power recovery control circuit includes relays K3 and K4 and a switch Q2. The switch Q2 is configured to be turned on to ground after receiving a power recovery signal. Specifically, in some embodiments, the switch Q2 can be configured as an NMOS transistor and turned on when the power recovery signal is high.

[0021] The power transfer control circuit and power outage recovery control circuit include four relays: K2, K1, K4, and K3. This product achieves high reliability through redundant design, including duplicate functional circuits and components, to prevent single points of failure. Each relay utilizes two sets of input and output circuits for redundancy. "IN1+, IN1-" and "IN2+, IN2-" represent the relay's control circuit (input), while "OUT1+, OUT1-" and "OUT2+, OUT2-" represent the relay's load circuit (output).

[0022] Specifically, in this embodiment, relays K2, K1, and K4 are each designed with two normally open terminals, meaning their output terminals are open when no input signal is present. Relay K3 is designed with two normally closed terminals, meaning its output terminals are closed when no input signal is present. Relays K1-K4 each utilize two sets of input and output terminals, achieving redundancy. Even if one set of inputs or outputs fails, power transfer control and power failure recovery functions can still be implemented.

[0023] In this embodiment, the secondary power supply assembly has dual power supplies, namely a first power supply terminal and a second power supply terminal. For example, when the first power supply is system power and the second power supply is ground power, when ground power is supplied, power is provided by the ground power supply terminal (+A) and the power return line (-B, equivalent to ground), with power bus +B energized. When system power is supplied, power is provided by the system power supply terminal (+BB) and the power return line -B, with power bus +B energized.

[0024] The power transfer control circuit takes effect when it receives a power transfer signal: the ground equipment sends a power transfer signal, relay K2 is turned on, the power transfer control terminal (ZD) connects to the power supply loop -B and maintains it. The holding time can be set to 100ms, and then the connection between the power transfer control terminal (ZD) and the power supply loop -B is disconnected, and the ground power supply is disconnected; at this time, the system power supply terminal +BB and the power supply loop -B provide power, and the power bus +B is energized.

[0025] After the power transfer control circuit completes the power transfer control, the power outage recovery control circuit takes effect: after the power transfer is completed, when it is necessary to shut down the system power supply and restore the ground power supply, the ground equipment sends a power outage recovery signal, the relay K4 is turned on, the power outage recovery control terminal (DDHF) connects to the power supply loop -B and holds it. The holding time can be set to 100ms, and then the power outage recovery control terminal (DDHF) is disconnected from the power supply loop -B; at this time, the system power supply terminal (+BB) is disconnected from the power bus +B. If the ground power supply is turned on, the ground power supply terminal (+A) and the power supply loop -B provide power.

[0026] In some embodiments, the circuit connection structure of the power transfer circuit is as follows:

[0027] Relay K1's two negative output terminals are connected to the power bus +B via an anti-reverse circuit, while its two positive output terminals are connected to the system power supply terminal +BB. Relay K1's two positive input terminals are connected to the power bus +B via current-limiting resistors (R), while its two negative input terminals are connected to the two negative output terminals of relay K2. Relay K2's two negative output terminals and two negative input terminals are connected to the power transfer control terminal ZD and the output terminal (drain) of switch Q1. The controlled terminal (gate) of switch Q1 is controlled by the power transfer signal, and its source is grounded. Furthermore, relay K2's two positive output terminals are grounded, while its two positive input terminals are connected to the two negative output terminals of relay K3 via current-limiting resistors (R).

[0028] In some embodiments, the circuit connection structure of the power failure recovery control circuit is as follows:

[0029] Relay K3's two positive input terminals are connected to the power bus +B through current-limiting resistors (R), its two positive output terminals are connected to the power bus +B, and its two negative input terminals are connected to the two positive output terminals of relay K4. Relay K4's two positive input terminals are connected to the ground power supply terminal +A through current-limiting resistors (R), and its two negative input terminals and two negative output terminals are connected to the power-off recovery control terminal DDHF and the output terminal (drain) of the switch Q2. The gate of the switch Q2 is controlled by the power-off recovery signal, and the source is grounded.

[0030] In order to prevent the ground power supply and the system power supply from flowing back to each other, an anti-reverse circuit is provided between the ground power supply terminal +A, the system power supply terminal +BB and the power bus +B. In some embodiments, the anti-reverse circuit is implemented by an anti-reverse diode. The anti-reverse circuit connected to the relay K1 includes parallel diodes D1 and D2 (parallel redundant design), the anodes of the diodes D1 and D2 are connected to the negative output terminal of the relay K1, and the cathodes are connected to the power bus +B. The anti-reverse circuit connected between the ground power supply terminal +A and the power bus +B includes parallel diodes D3 and D4, the anodes of the diodes D3 and D4 are connected to the ground power supply terminal, and the cathodes are connected to the power bus +B.

[0031] The overall working principle of the above embodiment is as follows:

[0032] When both the ground power supply terminal +A and the system power supply terminal +BB are simultaneously powered, switch Q1 receives a transfer signal (transfer control terminal ZD is connected to -B for 100ms), turns on, and the transfer control circuit activates relays K2 (two normally open) and K1 (two normally open) to connect their input and output terminals, respectively, transferring system power supply terminal +BB to power bus +B, thus achieving the transfer function. At this point, power bus +B forms a pathway with power return line -B. Since relay K2's input and output are conductive, power return line -B is connected to relay K2's negative input terminal. Even if the transfer signal no longer keeps switch Q1 off, relay K2's input activation remains, thus achieving the self-protection function of the transfer state.

[0033] After the system is powered on, the ground power supply +A can issue a power-off recovery signal (power-off recovery control terminal DDHF is connected to -B for 100ms). The power-off recovery control circuit activates relay K4 (two normally open) to energize its input and output terminals, and relay K3 (two normally closed) to energize its input and open its output terminals. This in turn controls relays K2 (two normally open) and K1 (two normally open) to open their input and output terminals, respectively, disconnecting power from system power supply terminal +BB and power bus +B. If the relay recovery signal is no longer asserted, relay K4's input and output become open, while relay K3's input becomes open and its output becomes energized. Since system power supply terminal +BB is disconnected from power bus +B, ground power supply terminal +A continues to supply power bus +B. If the ground power supply is restored, ground power is restored. Changes in power supply and signal status lead to changes in the input and output states of each relay, as well as the state of the +B power bus, as shown in the table below.

[0034]

[0035] As can be seen from the table above, the power transfer control circuit and power outage recovery control circuit of this application can realize the power transfer switching and power outage recovery functions between system power supply and ground power supply. The power transfer control circuit and the power outage recovery control circuit work together, and the circuit structure is not complicated while ensuring the fast on and off speed of the relay switch.

[0036] In the above-mentioned power transfer control circuit and power failure recovery control circuit, only relay K1 is a power relay, which is directly connected to the system power supply terminal +BB and passes a large current at the ampere level. The other three relays K2, K3, and K4 are all signal control relays, which pass a smaller current at the milliampere level. Compared with the two power relays used in the prior art, the power loss of the power supply and distribution control circuit of the present application is reduced by half. And in a preferred embodiment, the relay of the present application can be configured as a solid-state relay, which can achieve a higher power density at the same volume compared to the electromagnetic relay. The present application also realizes voltage backflow prevention through anti-reverse circuit design, and realizes high-reliability product design through redundant means such as parameter derating design and repeated configuration of functional circuits and devices.

[0037] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0038] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. A secondary power input and distribution control circuit, characterized in that: It includes a power transfer control circuit and a power failure recovery control circuit. The power transfer control circuit includes relays K1 and K2 and a switch tube Q1. The switch tube Q1 is configured to be connected to the ground after receiving a power transfer signal. The power failure recovery control circuit includes relays K3 and K4 and a switch tube Q2. The switch tube Q2 is configured to be connected to the ground after receiving a power failure recovery signal. The input end of the relay K2 is connected to the switch tube Q1 and the relay K3. The relay K2 is configured to be connected to the ground after the switch tube Q1 is turned on, and to be open after the switch tube Q2 is turned on. The output end of the relay K1 is connected to the first power supply end, and the input end is respectively connected to the power bus and the output of the relay K2, and is configured to maintain the same on-off state as the relay K2. The input end of the relay K3 is connected to the power bus and the output of the relay K4 respectively. The input end of the relay K4 is connected to the switch tube Q2 and the second power supply end, and is configured to be connected to the ground after the switch tube Q2 is turned on. Relays K2, K1, and K4 are all designed as two groups of normally open, and relay K3 is designed as two groups of normally closed; the output negative terminal and input negative terminal of the relay K2 are commonly connected to the power transfer control terminal and the output terminal of the switch tube Q1, and the controlled terminal of the switch tube Q1 is controlled by the power transfer signal; the output positive terminal of the relay K2 is grounded, and the input positive terminal is connected to the output negative terminal of the relay K3 through a current-limiting resistor; the output negative terminal of the relay K1 is connected to the power bus through an anti-reverse circuit, and the output positive terminal is connected to the first power supply terminal; the input positive terminal of the relay K1 is connected to the power bus through a current-limiting resistor, and the input negative terminal is connected to the output negative terminal of the relay K2; the input positive terminal of the relay K3 is connected to the power bus through a current-limiting resistor, the output positive terminal is connected to the power bus, and the input negative terminal is connected to the output positive terminal of the relay K4. The output terminal of the relay K3 is turned on when there is no input signal; the input positive terminal of the relay K4 is connected to the second power supply terminal through a current-limiting resistor, and the input negative terminal and the output negative terminal are commonly connected to the power failure recovery control terminal and the output terminal of the switch tube Q2.

2. A secondary power input and distribution control circuit according to claim 1, characterized in that: The anti-reverse circuit includes parallel diodes D1 and D2, wherein the anodes of the diodes D1 and D2 are connected to the negative output terminal of the relay K1, and the cathodes are connected to the power bus.

3. A secondary power input and distribution control circuit according to claim 1, characterized in that: An anti-reverse circuit is connected between the second power supply end and the power bus.

4. A secondary power input and distribution control circuit according to claim 3, characterized in that: The anti-reverse circuit includes diodes D3 and D4 connected in parallel, wherein the anodes of the diodes D3 and D4 are connected to the second power supply terminal, and the cathodes are connected to the power bus.

5. A secondary power input and distribution control circuit according to any one of claims 1 to 4, characterized in that: The relays K1 to K4 are solid-state relays.

6. A secondary power input and distribution control circuit according to claim 5, characterized in that: Relays K1 to K4 each have two sets of input terminals and output terminals.

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