Dual power reliable switch circuit and system

Abstract

The embodiment of the present application provides a kind of dual power supply reliable switch switching circuit and system, belong to electric power maintenance field.The switching circuit includes: main power supply, for the load power supply;First controllable switch, one end of the first controllable switch is connected with the main power supply, the other end is connected with the positive pole of load, the first controllable switch can be disconnected or closed according to whether the main power supply fails, the negative pole of the load is grounded;Auxiliary power supply, for the load power supply when main power supply fails;Second controllable switch, one end of the second controllable switch is connected with the auxiliary power supply, the other end is connected to the positive pole of the load, for closing when the first controllable switch is disconnected;Relay, the relay is connected between the second controllable switch and load and is connected with the first controllable switch.The circuit is dual power supply reliable switching circuit, can ensure the reliable switching of dual power supply.

Description

Technical Field

[0001] This invention relates to the field of power maintenance, and more specifically to a reliable dual-power switching circuit and system. Background Technology

[0002] In power systems, to ensure the reliable operation of electrical loads, a backup power supply is required. When the main power supply is disconnected due to a fault or other reason, the backup power supply can be switched on manually, allowing the electrical load to continue operating. This requires two conditions: 1. Ensuring that the main power supply has been disconnected and stopped supplying power to the load; 2. Ensuring that the circuit breaker of the backup power supply has been closed. This necessitates the use of a reliable dual-power supply switching circuit to detect these two conditions. Currently, there is usually no reliable dual-power supply switching circuit; that is, the power supply is switched directly by manual closing. If the main power supply is not disconnected, it will lead to a direct short circuit between the main power supply and the backup power supply, creating a safety hazard. Summary of the Invention

[0003] The purpose of this invention is to provide a reliable dual-power switching circuit and system. This circuit is a reliable dual-power switching circuit that can ensure reliable switching between dual power supplies.

[0004] To achieve the above objectives, in one aspect, embodiments of the present invention provide a dual-power reliable switching circuit, the switching circuit comprising: The main power supply is used to power the load; A first controllable switch, one end of which is connected to the main power supply and the other end of which is connected to the positive terminal of the load. The first controllable switch can be opened or closed depending on whether the main power supply is faulty. The negative terminal of the load is grounded. A secondary power supply is used to supply power to the load in the event of a failure of the main power supply; A second controllable switch, one end of which is connected to the auxiliary power supply and the other end of which is connected to the positive terminal of the load, is used to close when the first controllable switch is open; A relay, which is connected between the second controllable switch and the load and is also connected to the first controllable switch, is used to close or open the circuit containing the second controllable switch according to the closed state of the first controllable switch.

[0005] Optionally, the relay includes: A first port is located at one end of the relay and is connected to a second controllable switch. The second port, located at the other end of the relay and connected to the positive terminal of the load, can be opened and closed with the first port to open and close the circuit between the second controllable switch and the load.

[0006] Optionally, the relay includes: The third port is located at one end of the relay and is grounded; The fourth port, located at the other end of the relay and connected to the negative terminal of the load, can be opened and closed with the third port to open and close the circuit in which it is located.

[0007] Optionally, the relay includes: The fifth port is located at one end of the relay; The sixth port, located at the other end of the relay, is used for the voltage state between the fifth port and the fifth port to control the opening and closing of the first port, the second port, the third port, and the fourth port.

[0008] Optionally, the switching circuit includes: A third controllable switch, one end of which is connected to the second port; The NOT gate has its input connected to the other end of the third controllable switch, and its upper part is connected to the auxiliary power supply while its lower part is grounded. The AND gate has its first pin connected to the output of the NOT gate, its second pin connected to the first port, its output connected to the fifth port, its upper part connected to the auxiliary power supply, and its lower part grounded and connected to the sixth port.

[0009] Optionally, the third controllable switch includes: An optocoupler, wherein the first pin of the optocoupler is connected to the second port, the second pin is grounded, the third pin of the optocoupler is connected to the input terminal of the NOT gate, and the fourth pin is grounded; The first resistor has one end connected to the second port and the other end grounded.

[0010] Optionally, the switching circuit includes a first flip-flop, the first pin of which is connected to the output of the NOT gate, the output of which is connected to the first pin of the AND gate, and the second pin of which is connected to the auxiliary power supply. The upper part of the first flip-flop is connected to the auxiliary power supply, and the lower part is grounded.

[0011] Optionally, the switching circuit includes: The second flip-flop has its first pin connected to the first port, its output connected to the second pin of the AND gate, its second pin connected to the auxiliary power supply, its upper part connected to the auxiliary power supply, and its lower part grounded. The second resistor has one end connected to the first port and the other end grounded.

[0012] Optionally, the switching circuit includes a fourth controllable switch, the first pin of which is connected to the fifth port, the second pin of which is connected to the sixth port, the third pin of which is connected to an external warning device, and the fourth pin is grounded.

[0013] On the other hand, the present invention also provides a dual-power reliable switching circuit system, the system including a load and a dual-power reliable switching circuit as described in any of the above claims.

[0014] Through the above technical solution, the present invention provides a reliable dual-power switching circuit. A main power supply is set up to power the load. One end of a first controllable switch is connected to the main power supply, and the other end is connected to the positive terminal of the load, automatically opening or closing depending on whether the main power supply fails. An auxiliary power supply can power the load when the main power supply fails. One end of a second controllable switch can be connected to the auxiliary power supply, and the other end can be connected to the positive terminal of the load, closing when the first controllable switch is open. A relay can be connected between the second controllable switch and the load, and can also be connected to the first controllable switch, to open or close the circuit containing the second controllable switch based on the closed state of the first and second controllable switches. When the main power supply fails, the first controllable switch opens, and the relay closes. When the second controllable switch closes, the auxiliary power supply connected to the second controllable switch can reliably power the load.

[0015] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a circuit diagram of a dual-power reliable switching circuit according to an embodiment of the present invention; Figure 2 This is a switching control circuit for a dual-power reliable switching circuit according to one embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0019] Figure 1 This is a circuit diagram of a reliable dual-power switching circuit according to an embodiment of the present invention. In this invention, the switching circuit may include: a main power supply V1, a first controllable switch S1, an auxiliary power supply V2, a second controllable switch S2, and a relay K. The main power supply V1 is used to supply power to the load. One end of the first controllable switch S1 can be connected to the main power supply V1, and the other end can be connected to the positive terminal of the load. The first controllable switch S1 can be opened or closed depending on whether the main power supply V1 is faulty. When the main power supply V1 fails, the first controllable switch S1 can be opened; when the main power supply V1 is not faulty, the first controllable switch S1 can be closed. The auxiliary power supply V2 can be used to supply power to the load when the main power supply V1 fails. One end of the second controllable switch S2 can be connected to the auxiliary power supply V2, and the other end can be connected to the positive terminal of the load. It can be closed when the first controllable switch S1 is open. Relay K can be connected between the second controllable switch S2 and the load, and can also be connected to the first controllable switch S1. It can be used to close or open the circuit containing the second controllable switch S2 based on the closed state of the first controllable switch S1, so that the auxiliary power supply V2 can supply power to the load. Relay K only closes the circuit between the second controllable switch S2 and the load when the main power supply V1 fails. Therefore, when the main power supply V1 is not faulty, even if the second controllable switch S2 is closed, the circuit between the auxiliary power supply V2 and the load is open, and the main power supply V1 and the auxiliary power supply V2 will not short-circuit due to the closure of the second controllable switch S2, thus preventing safety hazards.

[0020] In one embodiment of the present invention, such as Figure 1 As shown, the relay K may include a first port 1 and a second port 2. The first port 1 can be located at one end of the relay K and can be connected to a second controllable switch S2. The second port 2 can be located at the other end of the relay K and can be connected to the positive terminal of the load. The first port 1 and the second port 2 can be opened and closed, allowing them to be short-circuited or open-circuited. When the first port 1 and the second port 2 are short-circuited, the circuit between the second controllable switch S2 and the load can be closed. When the first port 1 and the second port 2 are open-circuited, the circuit between the second controllable switch S2 and the load can be disconnected. Therefore, the first port 1 and the second port 2 can control the on / off state of the circuit between the second controllable switch S2 and the load.

[0021] In one embodiment of the present invention, such as Figure 1As shown, the relay K may include a third port 3 and a fourth port 4. The third port 3 can be located at one end of the relay K and can be grounded. The fourth port 4 can be located at the other end of the relay K and can be connected to the negative terminal of the load. The third port 3 can be open-circuited or short-circuited by the fourth port 4, thereby opening and closing the circuit containing the third port 3 and the fourth port 4. When the first port 1 and the second port 2 are closed, the third port 3 and the fourth port 4 will also be closed. Then, the auxiliary power supply V2, the second controllable switch S2, the relay K, and the circuit containing the load can form a loop, and the auxiliary power supply V2 can supply power to the load.

[0022] In one embodiment of the present invention, such as Figure 1 As shown, the relay K may include a fifth port 5 and a sixth port 6. The fifth port 5 can be located at one end of the relay K. The sixth port 6 can be located at the other end of the relay K. The fifth port 5 and the sixth port 6 can be control ports, controlling the on and off states of the relay K. The fifth port 5 can be a positive control port, and the sixth port 6 can be a negative control port. When the voltage between the fifth port 5 and the sixth port 6 (the positive control voltage minus the negative control voltage) is high, the relay K can conduct, meaning the first port 1 and the second port 2 are short-circuited. The third port 3 and the fourth port 4 can be short-circuited, and the auxiliary power supply V2 can supply power to the load. When the voltage between the fifth port 5 and the sixth port 6 is low, the relay K can be off, meaning the first port 1 and the second port are open-circuited, and the third port 3 and the fourth port 4 can also be open-circuited, thus the auxiliary power supply V2 cannot supply power to the load.

[0023] In one embodiment of the present invention, such as Figure 2As shown, the switching circuit may include: a third controllable switch S3, a NOT gate U1, and an AND gate U2. One end of the third controllable switch S3 can be connected to the second port 2. The input terminal of the NOT gate U1 can be connected to the other end of the third controllable switch S3, and the upper part of the NOT gate U1 can be connected to the auxiliary power supply V2, while the lower part can be grounded. The first pin (port 1) of the AND gate U2 can be connected to the output terminal of the NOT gate U1, the second pin (port 2) can be connected to the first port 1, the output terminal of the AND gate U2 can be connected to the fifth port 5, the upper part of the AND gate U2 can be connected to the auxiliary power supply V2, the lower part can be grounded, and it can also be connected to the sixth port 6. When the main power supply V1 is not faulty, the first controllable switch S1 can be closed. The third controllable switch S3 will then close accordingly. Therefore, the input of the NOT gate U1 connected to the third controllable switch S3 can receive a high level. This high level, after passing through the NOT gate U1, will output a low level. The first pin of the AND gate U2 can be connected to the output of the NOT gate U1, thus receiving a low level. The second pin of the AND gate U2 can be connected to the first port 1, which is connected to the second controllable switch S2. The second controllable switch S2 is a normally closed switch, so the voltage at the first port 1 is high. Therefore, the second pin of the AND gate U2 is also high. Because the voltage states at the first and second pins of the AND gate U2 are different, the AND gate U2 outputs a low level. The fifth port 5 connected to the output of the AND gate U2 is also low. The voltage between the fifth port 5 and the sixth port 6 is low, the relay K is off, and the main power supply V1 continues to supply power to the load. When the main power supply fails, the first controllable switch S1 opens, the input of the NOT gate U1 is low, and the NOT gate U1 outputs a high level. The first and second pins of the AND gate U2 are both high, so the AND gate U2 outputs a high level. The fifth port 5, connected to the output of the AND gate U2, is high, resulting in a high voltage between the fifth port 5 and the sixth port 6. The relay K closes, and the auxiliary power supply V2 can then supply power to the load.

[0024] In one embodiment of the present invention, the third controllable switch S3 may include an optocoupler Q and a first resistor R1. The first pin (port 1) of the optocoupler Q can be connected to the second port 2, and the second pin (port 2) can be grounded. The third pin (port 3) of the optocoupler Q can be connected to the input of the NOT gate U1, and the fourth pin (port 4) can be grounded. One end of the first resistor R1 can be connected to the second port 2, and the other end can be grounded. The optocoupler Q can be connected to the second port 2, and the second port 2 can be connected to the first controllable switch S1. Therefore, the optocoupler Q can output a high or low level depending on whether the first controllable switch S1 is on or off. When the first controllable switch S1 is on, both the input and output of the optocoupler Q are high; when the first controllable switch S1 is off, both the input and output of the optocoupler Q are low. The first resistor R1 can shunt current to the first pin of the optocoupler Q.

[0025] In one embodiment of the present invention, the switching circuit may include a first flip-flop D1. The first pin (port 1) of the first flip-flop D1 may be connected to the output of a pool-NOT gate U1, the output of the first flip-flop D1 may be connected to the first pin of an AND gate U2, and the second pin of the first flip-flop D1 may be connected to an auxiliary power supply V2, so that the auxiliary power supply V2 can power the first flip-flop D1. The upper part of the first flip-flop D1 may be connected to the auxiliary power supply V2, and the lower part may be grounded. The first flip-flop D1 can output a corresponding signal according to the input signal.

[0026] In one embodiment of the present invention, the switching circuit may include a second flip-flop D2 and a second resistor R2. The first pin (port 1) of the second flip-flop D2 can be connected to the first port 1, and the output of the second flip-flop D2 can be connected to the second pin of the AND gate U2. The second pin (port 2) of the second flip-flop D2 can be connected to the auxiliary power supply V2, with the upper part of the second flip-flop D2 connected to the auxiliary power supply V2 and the lower part grounded. One end of the second resistor R2 can be connected to the first port 1, and the other end can be grounded. The second flip-flop D2 can output a corresponding signal according to the input signal. The second resistor R2 can shunt current to the first pin of the second flip-flop D2.

[0027] In one embodiment of the present invention, the switching circuit may include a fourth controllable switch S4. The first pin (port 1) of the fourth controllable switch S4 can be connected to the fifth port, the second pin (port 2) can be connected to the sixth port 6, the third pin (port 3) of the fourth controllable switch S4 can be connected to an external warning device, and the fourth pin (port 4) is grounded. When the voltage at the fifth port 5 is high, the fourth controllable switch S4 is in a conducting state, and the fourth controllable switch S4 can output a high level to the warning device to alert personnel that the main power supply V1 has malfunctioned.

[0028] On the other hand, the present invention also provides a dual-power reliable switching circuit system, the system including a load and a dual-power reliable switching circuit as described above.

[0029] Through the above technical solution, the present invention provides a reliable dual-power switching circuit. A main power supply is set up to power the load. One end of a first controllable switch is connected to the main power supply, and the other end is connected to the positive terminal of the load, automatically opening or closing depending on whether the main power supply fails. An auxiliary power supply can power the load when the main power supply fails. One end of a second controllable switch can be connected to the auxiliary power supply, and the other end can be connected to the positive terminal of the load, closing when the first controllable switch is open. A relay can be connected between the second controllable switch and the load, and can also be connected to the first controllable switch, to open or close the circuit containing the second controllable switch based on the closed state of the first and second controllable switches. When the main power supply fails, the first controllable switch opens, and the relay closes. When the second controllable switch closes, the auxiliary power supply connected to the second controllable switch can reliably power the load.

[0030] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0031] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A reliable dual-power switching circuit, characterized in that, The switching circuit includes: The main power supply is used to power the load; A first controllable switch, one end of which is connected to the main power supply and the other end of which is connected to the positive terminal of the load. The first controllable switch can be opened or closed depending on whether the main power supply is faulty. The negative terminal of the load is grounded. A secondary power supply is used to supply power to the load in the event of a failure of the main power supply; A second controllable switch, one end of which is connected to the auxiliary power supply and the other end of which is connected to the positive terminal of the load, is used to close when the first controllable switch is open; A relay, which is connected between the second controllable switch and the load and is also connected to the first controllable switch, is used to close or open the circuit containing the second controllable switch according to the closed state of the first controllable switch; The relay includes: A first port is located at one end of the relay and is connected to a second controllable switch. The second port is located at the other end of the relay and connected to the positive terminal of the load. It can be opened and closed with the first port to open and close the circuit between the second controllable switch and the load. The third port is located at one end of the relay and is grounded; The fourth port, located at the other end of the relay and connected to the negative terminal of the load, can be opened and closed with the third port to open and close the circuit in which it is located; The fifth port is located at one end of the relay; The sixth port, located at the other end of the relay, is used for the voltage state between the fifth port and the fifth port to control the opening and closing of the first port, the second port, the third port, and the fourth port; The switching circuit includes: A third controllable switch, one end of which is connected to the second port; The NOT gate has its input terminal connected to the other end of the third controllable switch, and its upper part is connected to the auxiliary power supply, while its lower part is grounded. The AND gate has its first pin connected to the output of the NOT gate, its second pin connected to the first port, its output connected to the fifth port, its upper part connected to the auxiliary power supply, and its lower part grounded and connected to the sixth port.

2. The switching circuit according to claim 1, characterized in that, The third controllable switch includes: An optocoupler, wherein the first pin of the optocoupler is connected to the second port, the second pin is grounded, the third pin of the optocoupler is connected to the input terminal of the NOT gate, and the fourth pin is grounded; The first resistor has one end connected to the second port and the other end grounded.

3. The switching circuit according to claim 1, characterized in that, The switching circuit includes a first flip-flop, the first pin of which is connected to the output of the NOT gate, the output of which is connected to the first pin of the AND gate, and the second pin of which is connected to the auxiliary power supply. The upper part of the first flip-flop is connected to the auxiliary power supply, and the lower part is grounded.

4. The switching circuit according to claim 1, characterized in that, The switching circuit includes: The second flip-flop has its first pin connected to the first port, its output connected to the second pin of the AND gate, its second pin connected to the auxiliary power supply, its upper part connected to the auxiliary power supply, and its lower part grounded. The second resistor has one end connected to the first port and the other end grounded.

5. The switching circuit according to claim 1, characterized in that, The switching circuit includes a fourth controllable switch, the first pin of which is connected to the fifth port, the second pin of which is connected to the sixth port, the third pin of which is connected to an external warning device, and the fourth pin is grounded.

6. A reliable dual-power supply switching circuit system, characterized in that, The system includes a load and a dual-power reliable switching circuit as described in any one of claims 1 to 5.

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