Dual-power supply control circuit and electronic equipment

Abstract

The utility model discloses a dual-power-supply power supply control circuit and electronic equipment. The dual-power-supply power supply control circuit comprises a frequently-used power supply, a standby power supply, a first power supply detection and control circuit, a second power supply detection and control circuit, a state detection circuit, a first switch and a second switch, the frequently-used power supply is connected with the load through the first switch. The standby power supply is connected with the load through the second switch. The first power supply detection and control circuit is respectively connected with the frequently-used power supply and the state detection circuit; the second power supply detection and control circuit is respectively connected with the standby power supply and the state detection circuit; when the voltage of the frequently-used power supply is normal, the first power detection and control circuit drives the first switch to be closed, and the frequently-used power supply supplies power to the load. When the common power supply voltage is abnormal and the standby power supply voltage is normal, the second power supply detection and control circuit drives the second switch to be closed, and the standby power supply supplies power to the load. The problems that an existing circuit design does not have the overvoltage and undervoltage protection function, and sparks are likely to be generated when different power supplies are switched are solved.

Description

Technical Field

[0001] The present application relates to the technical field of dual power supply control, and in particular to a dual power supply control circuit and electronic equipment. Background Art

[0002] In some occasions, the requirements for power supply reliability are getting higher and higher. Generally, two power supplies are required to ensure the reliability of power supply. When one power supply fails for some reason, it can automatically switch to another power supply to ensure that the load is not affected by the power outage.

[0003] Traditional dual power supply circuits usually use relays or micro switches to achieve automatic switching of dual power supplies. When the normal power supply is used, the dual power supply is in the normal closing state by driving the relay coil to be attracted, and the normal power supply supplies power to the load; when the backup power supply is used, the dual power supply is in the backup closing state by controlling the relay coil to be released, and the backup power supply supplies power to the load, thereby realizing the automatic switching and self-recovery function of the dual power supply;

[0004] However, this dual power supply circuit design lacks over-voltage and under-voltage protection functions. When over-voltage or under-voltage occurs in one power supply, it is unable to identify and execute the corresponding switching, and sparks are easily generated when the relay or micro switch is actuated. Utility Model Content

[0005] In order to solve the problem that the existing dual power supply circuit lacks over-voltage and under-voltage protection functions, and that sparks are easily generated when relays or micro switches are actuated, the present application provides a dual power supply control circuit and electronic equipment.

[0006] In a first aspect, the present application provides a dual power supply control circuit, which adopts the following technical solution: the dual power supply control circuit includes a common power supply, a backup power supply, a first power supply detection and control circuit, a second power supply detection and control circuit, a state detection circuit, a first switch and a second switch;

[0007] The common power supply is connected to the load through the first switch, and the backup power supply is connected to the load through the second switch; the input end of the first power supply detection and control circuit is connected to the common power supply, and the output end is connected to the input end of the state detection circuit; the input end of the second power supply detection and control circuit is connected to the output ends of the backup power supply and the state detection circuit respectively;

[0008] The first power supply detection and control circuit enters a working state by detecting the voltage of the common power supply, drives the first switch to close, and enables the common power supply to supply power to the load; or enters a standby state by detecting the voltage of the common power supply, and enables the first switch to be disconnected;

[0009] The second power supply detection and control circuit detects the state of the first power supply detection and control circuit through the state detection circuit. When the first power supply detection and control circuit is in the working state, the second power supply detection and control circuit enters the standby state, so that the second switch is disconnected; when the first power supply detection and control circuit is in the standby state, the second power supply detection and control circuit enters the working state by detecting the voltage of the backup power supply, drives the second switch to close, and enables the backup power supply to supply power to the load.

[0010] By adopting the above technical solution, on the one hand, the common power supply is detected by the first power supply detection and control circuit. When the voltage of the common power supply is normal, the first power supply detection and control circuit enters the working state, and the common power supply is used to power the load. At the same time, the second power supply detection and control circuit senses that the first power supply detection and control circuit is working through the state detection circuit, and then controls the connection between the backup power supply and the load to be disconnected; when the common power supply has an abnormal situation such as overvoltage or undervoltage, the first power supply detection and control circuit enters the standby state, so that the connection between the common power supply and the load is disconnected. At the same time, the second power supply detection and control circuit senses that the first power supply detection and control circuit is not working through the state detection circuit, and then further detects the backup power supply. When the voltage of the backup power supply is normal, the backup power supply is controlled to power the load; the problem of lack of over-voltage and under-voltage protection function in the existing related excitation dual power supply circuit is well solved, and when a certain power supply has overvoltage, undervoltage, etc., it is impossible to better identify and execute the corresponding switching; on the other hand, the dual power supply control circuit of the present application cancels the relay and micro switch that are prone to sparks when switching, so that the circuit is safer and more reliable when switching between different power supplies.

[0011] In a specific implementation scheme, the first power supply detection and control circuit includes a first MCU, a first MCU power supply module, a first voltage sampling module, and a first switch control module;

[0012] The input end of the first MCU power supply module is connected to the common power supply, and the output end is connected to the first MCU; the input end of the first voltage sampling module is connected to the common power supply, and the output end is connected to the first MCU; the first switch control module is connected to the common power supply and the first MCU respectively;

[0013] The first MCU power supply module converts the output voltage of the common power supply into a first voltage and outputs the first voltage to the first MCU; the first voltage is used to provide power for the operation of the first MCU;

[0014] The first MCU detects the voltage of the common power supply through the first voltage sampling module, enters the working state, and drives the first switch to close by controlling the first switch control module; or detects the voltage of the common power supply through the first voltage sampling module, enters the standby state, and disconnects the first switch.

[0015] By adopting the above technical solution, in the design of the first power supply detection and control circuit, the first MCU power supply module is firstly used to provide energy for the operation of the first MCU based on the output of the common power supply; then the first MCU detects the voltage of the common power supply through the first voltage sampling module, and controls the first switch control module to drive the first switch to close or open.

[0016] In a specific implementation scheme, the first MCU power supply module includes a first voltage protection submodule, a first voltage reduction submodule, a first rectifier submodule, a first voltage stabilization submodule and a second filter submodule;

[0017] The first voltage protection submodule includes a varistor RM1; the first voltage step-down submodule includes a resistor R1, a resistor R2, a resistor R3 and a capacitor C1; the first rectifier submodule includes a diode D1 and a diode D2; the first voltage stabilizing submodule includes a voltage stabilizing diode DZ1; the second filtering submodule includes a capacitor C2;

[0018] The first end of the varistor RM1 and the first end of the resistor R3 are both connected to the common power supply; the second end of the resistor R3 is respectively connected to the first end of the resistor R2 and the first end of the capacitor C1; the second end of the resistor R2 is connected to the first end of the resistor R1; the second end of the resistor R1 is respectively connected to the second end of the capacitor C1, the positive electrode of the diode D1 and the negative electrode of the diode D2; the negative electrode of the diode D1 is respectively connected to the negative electrode of the voltage-stabilizing diode DZ1, the positive electrode of the capacitor C2 and the first MCU;

[0019] The second end of the varistor RM1, the anode of the diode D2, the anode of the voltage-stabilizing diode DZ1 and the cathode of the capacitor C2 are all grounded.

[0020] By adopting the above technical solution, after the voltage of the common power supply 1 is reduced by the first step-down submodule, the corresponding voltage VCC1 is output to the first MCU to provide power for the operation of the first MCU; at the same time, through the lightning protection function of the first voltage protection submodule, the rectification function of the first rectifier submodule, the voltage stabilization function of the first voltage stabilization submodule and the filtering function of the second filtering submodule, the safety of the circuit and the reliability of power supply to the first MCU are improved.

[0021] In a specific implementation scheme, the first voltage sampling module includes a first voltage dividing submodule, a first protection submodule and a first filtering submodule;

[0022] The first voltage divider module includes a resistor R4, a resistor R5 and a resistor R6; the first protection module includes a diode D4; the first filter module includes a capacitor C3;

[0023] The first end of the resistor R4 is connected to the common power supply; the second end of the resistor R4 is connected to the first end of the resistor R5; the second end of the resistor R5 is connected to the positive electrode of the diode D4, and the negative electrode of the diode D4 is respectively connected to the first end of the resistor R6, the first end of the capacitor C3 and the first MCU;

[0024] The second end of the resistor R6 and the second end of the capacitor C3 are both grounded.

[0025] By adopting the above technical solution, after the common power supply is divided by resistors R4, R5 and R6, the first MCU performs voltage detection. Combined with the anti-backflow function of diode D4 and the filtering function of capacitor C3, the first MCU obtains a more accurate voltage value, thereby accurately judging the voltage state of the common power supply as normal voltage / undervoltage / overvoltage.

[0026] In a specific implementation scheme, the first switch control module includes a first electromagnet, a first electromagnetic protection submodule, a first controllable switch submodule, a first current limiting submodule and a first anti-interference submodule;

[0027] The first electromagnetic protection submodule includes a diode D3; the first controllable switch submodule includes a thyristor switch tube T1; the first current limiting submodule includes a resistor R7; the first anti-interference submodule includes a capacitor C4;

[0028] The cathode of the diode D3 is connected to the common power supply and the first electromagnet respectively; the anode of the diode D3 is connected to the first electromagnet and the first end of the thyristor switch tube T1 respectively; the second end of the thyristor switch tube T1 is connected to the first end of the resistor R7 and the first end of the capacitor C4 respectively; the second end of the capacitor C4 and the third end of the thyristor switch tube T1 are both grounded; the second end of the resistor R7 is connected to the first MCU.

[0029] By adopting the above technical solution, the first MCU realizes the on-off control of the thyristor switch tube T1 and the attraction or release control of the first electromagnet by controlling the voltage at the second end of the resistor R7, and finally realizes the on-off control of the first switch; in addition, combined with the protection of the diode D3 on the discharge of the first electromagnet, the current limiting function of the resistor R7 and the anti-interference function of the capacitor C4, the circuit reliability is improved.

[0030] In a specific implementation scheme, the first power supply detection and control circuit further includes a first LED indication module; the first LED indication module is used to indicate the voltage state of the common power supply, and the first LED indication module includes a resistor R8 and a first LED lamp;

[0031] After the resistor R8 and the first LED lamp are connected in series, one end of the resistor R8 is connected to the output end of the first MCU power supply module, and the other end is connected to the first MCU.

[0032] By adopting the above technical solution, the voltage status of the current common power supply can be conveniently displayed through the first LED indicator module.

[0033] In a specific implementation scheme, the state detection circuit includes an optocoupler and a resistor R9; the optocoupler includes a light emitting diode and a phototransistor;

[0034] The first end of the light emitting diode is connected to the first power detection and control circuit through the resistor R9, and the second end is connected to the first power detection and control circuit; the first end of the phototransistor is connected to the second power detection and control circuit, and the second end is grounded;

[0035] The second power supply detection and control circuit determines the state of the first power supply detection and control circuit by detecting the current of the phototransistor.

[0036] By adopting the above technical solution and using an optical coupler, isolation between two power supplies is achieved, and the second power detection and control circuit can also obtain the working status information of the first power detection and control circuit.

[0037] In a second aspect, the present application provides an electronic device, comprising the dual power supply control circuit in the above-mentioned first aspect or any possible implementation scheme of the first aspect.

[0038] In summary, the technical solution of this application includes at least the following beneficial technical effects:

[0039] 1. The dual power supply control circuit of the present application, on the one hand, detects the common power supply through the first power supply detection and control circuit. When the voltage of the common power supply is normal, the first power supply detection and control circuit enters the working state, and uses the common power supply to power the load. At the same time, the second power supply detection and control circuit senses that the first power supply detection and control circuit is working through the state detection circuit, and then controls the connection between the backup power supply and the load to be disconnected; when the common power supply has an abnormal situation such as overvoltage or undervoltage, the first power supply detection and control circuit enters the standby state, so that the connection between the common power supply and the load is disconnected. At the same time, the second power supply detection and control circuit senses that the first power supply detection and control circuit is not working through the state detection circuit, and then further detects the backup power supply. When the voltage of the backup power supply is normal, the backup power supply is controlled to power the load; it is a good solution to the lack of over-voltage and under-voltage protection function in the existing related excitation dual power supply circuit, when a certain power supply has overvoltage, undervoltage, etc., it is impossible to better identify and execute the corresponding switching; on the other hand, the dual power supply control circuit of the present application cancels the relay and micro switch that are prone to sparks when switching, so that the circuit is safer and more reliable when switching between different power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is an overall structural diagram of the dual power supply control circuit in the embodiment of the present application;

[0041] Figure 2 is a specific circuit diagram of the first power detection and control circuit in the embodiment of the present application;

[0042] Figure 3 is a specific circuit diagram of the state detection circuit in the embodiment of the present application;

[0043] Figure 4 It is a specific circuit diagram of the second power supply detection and control circuit in the embodiment of the present application.

[0044] Description of reference numerals:

[0045] 1. Normal power supply; 2. Backup power supply; 3. First power supply detection and control circuit; 31. First MCU; 32. First MCU power supply module; 321. First voltage protection submodule; 322. First voltage reduction submodule; 323. First rectifier submodule; 324. First voltage stabilization submodule; 325. Second filter submodule; 33. First voltage sampling module; 331. First voltage divider submodule; 332. First protection submodule; 333. First filter submodule; 34. First switch control module; 341. First electromagnet; 342. First electromagnetic protection submodule; 343. First controllable switch submodule; 344. First current limiting submodule; 345. First anti-interference submodule; 35. First LED indication module; 4. Second Power supply detection and control circuit; 41, second MCU; 42, second MCU power supply module; 421, second voltage protection submodule; 422, second step-down submodule; 423, second rectifier submodule; 424, second voltage stabilization submodule; 425, fourth filter submodule; 43, second voltage sampling module; 431, second voltage divider submodule; 432, second protection submodule; 433, third filter submodule; 44, second switch control module; 441, second electromagnet; 442, second electromagnetic protection submodule; 443, second controllable switch submodule; 444, second current limiting submodule; 445, second anti-interference submodule; 45, second LED indication module; 5, state detection circuit; 6, first switch; 7, second switch. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0047] The present application embodiment discloses a dual power supply control circuit, such as Figure 1 As shown, it includes a normal power supply 1, a backup power supply 2, a first power supply detection and control circuit 3, a second power supply detection and control circuit 4, a state detection circuit 5, a first switch 6 and a second switch 7.

[0048] The normal power supply 1 is connected to the load through the first switch 6, and the backup power supply 2 is connected to the load through the second switch 7; the input end of the first power supply detection and control circuit 3 is connected to the normal power supply 1, and the output end is connected to the input end of the status detection circuit 5; the input end of the second power supply detection and control circuit 4 is respectively connected to the output ends of the backup power supply 2 and the status detection circuit 5.

[0049] The first power supply detection and control circuit 3 enters a working state by detecting the voltage of the common power supply 1, and drives the first switch 6 to close, so that the common power supply 1 supplies power to the load; or enters a standby state by detecting the voltage of the common power supply 1, so that the first switch 6 is disconnected;

[0050] Specifically, when the voltage of the common power supply 1 is in a normal voltage state, the first power supply detection and control circuit 3 enters a working state; when the voltage of the common power supply 1 is in an undervoltage or overvoltage state, the first power supply detection and control circuit 3 enters a standby state.

[0051] The second power supply detection and control circuit 4 detects the state of the first power supply detection and control circuit 3 through the state detection circuit 5. When the first power supply detection and control circuit 3 is in the working state, the second power supply detection and control circuit 4 enters the standby state, and the second switch 7 is disconnected; when the first power supply detection and control circuit 3 is in the standby state, the second power supply detection and control circuit 4 enters the working state by detecting the voltage of the backup power supply 2, and drives the second switch 7 to close, so that the backup power supply 2 supplies power to the load;

[0052] Similarly, when the voltage of the backup power supply 2 is in a normal voltage state, the second power supply detection and control circuit 4 enters a working state; when the voltage of the backup power supply 2 is in an undervoltage or overvoltage state, the second power supply detection and control circuit 4 enters a standby state and does not drive the second switch 7 to close.

[0053] The dual power supply control circuit of this embodiment, on the one hand, detects the common power supply 1 through the first power supply detection and control circuit 3. When the voltage of the common power supply 1 is normal, the first power supply detection and control circuit 3 enters the working state, and uses the common power supply 1 to power the load. At the same time, the second power supply detection and control circuit 4 senses that the first power supply detection and control circuit 3 is working through the state detection circuit 5, and then controls the connection between the backup power supply 2 and the load to be disconnected;

[0054] When the common power supply 1 has an abnormal situation such as overvoltage or undervoltage, the first power supply detection and control circuit 3 enters the standby state, so that the connection between the common power supply 1 and the load is disconnected. At the same time, the second power supply detection and control circuit 4 senses through the state detection circuit 5 that the first power supply detection and control circuit 3 is not working, and then further detects the backup power supply 2. When the voltage of the backup power supply 2 is normal, the backup power supply 2 is controlled to supply power to the load; this solves the problem of lack of over- and under-voltage protection functions in the existing related excitation dual power supply circuits, and when a certain power supply has an overvoltage, undervoltage, etc., it is impossible to better identify and execute the corresponding switching; on the other hand, the dual power supply control circuit of the present application eliminates the relays and micro switches that are prone to sparks when switching, so that the circuit is safer and more reliable when switching between different power supplies.

[0055] In a possible implementation, Figure 2 As shown, the first power supply detection and control circuit 3 includes a first MCU 31, a first MCU power supply module 32, a first voltage sampling module 33, and a first switch control module 34;

[0056] The input end of the first MCU power supply module 32 is connected to the common power supply 1, and the output end is connected to the first MCU 31; the input end of the first voltage sampling module 33 is connected to the common power supply 1, and the output end is connected to the first MCU 31; the first switch control module 34 is connected to the common power supply 1 and the first MCU 31 respectively;

[0057] The first MCU power supply module 32 converts the output voltage of the common power supply 1 into a first voltage and outputs it to the first MCU 31; the first voltage is used to provide power for the operation of the first MCU 31;

[0058] The first MCU 31 detects the voltage of the common power supply 1 through the first voltage sampling module 33, enters the working state, and drives the first switch 6 to close by controlling the first switch control module 34; or detects the voltage of the common power supply 1 through the first voltage sampling module 33, enters the standby state, and disconnects the first switch 6.

[0059] Therefore, in the design of the first power supply detection and control circuit 3, the first MCU power supply module 32 first provides energy for the operation of the first MCU based on the output of the common power supply 1; then the first MCU detects the voltage of the common power supply 1 through the first voltage sampling module 33, and controls the first switch control module 34 to drive the first switch 6 to close or open.

[0060] In a possible implementation, Figure 2As shown, the first MCU power supply module 32 includes a first voltage protection submodule 321, a first voltage reduction submodule 322, a first rectifier submodule 323, a first voltage stabilization submodule 324 and a second filtering submodule 325;

[0061] The first voltage protection submodule 321 includes a varistor RM1; the first voltage reduction submodule includes a resistor R1, a resistor R2, a resistor R3 and a capacitor C1; the first rectifier submodule 323 includes a diode D1 and a diode D2; the first voltage stabilizing submodule 324 includes a voltage stabilizing diode DZ1; the second filtering submodule 325 includes a capacitor C2;

[0062] The first end of the varistor RM1 and the first end of the resistor R3 are both connected to the common power supply 1; the second end of the resistor R3 is respectively connected to the first end of the resistor R2 and the first end of the capacitor C1; the second end of the resistor R2 is connected to the first end of the resistor R1; the second end of the resistor R1 is respectively connected to the second end of the capacitor C1, the positive electrode of the diode D1 and the negative electrode of the diode D2; the negative electrode of the diode D1 is respectively connected to the negative electrode of the voltage-stabilizing diode DZ1, the positive electrode of the capacitor C2 and the first MCU31;

[0063] The second end of the varistor RM1, the anode of the diode D2, the anode of the voltage-stabilizing diode DZ1 and the cathode of the capacitor C2 are all grounded.

[0064] Furthermore, the first end of the varistor RM1 and the first end of the resistor R3 are both connected to the live wire of the common power supply 1; the second end of the varistor RM1, the positive electrode of the diode D2, the positive electrode of the zener diode DZ1 and the negative electrode of the capacitor C2 are all connected to the neutral wire of the common power supply 1.

[0065] Therefore, after the voltage of the common power supply 1 is reduced by the first step-down submodule 322, the corresponding voltage VCC1 is output to the first MCU31 to provide power for the operation of the first MCU31; at the same time, through the lightning protection function of the first voltage protection submodule 321, the rectification function of the first rectifier module 323, the voltage stabilization function of the first voltage stabilization submodule 324 and the filtering function of the second filtering submodule 325, the safety of the circuit and the reliability of power supply to the first MCU31 are improved.

[0066] In a possible implementation, Figure 2 As shown, the first voltage sampling module 33 includes a first voltage dividing submodule 331, a first protection submodule 332 and a first filtering submodule 333;

[0067] The first voltage dividing submodule 331 includes a resistor R4, a resistor R5 and a resistor R6; the first protection submodule 332 includes a diode D4; the first filtering submodule 333 includes a capacitor C3;

[0068] The first end of the resistor R4 is connected to the common power supply 1; the second end of the resistor R4 is connected to the first end of the resistor R5; the second end of the resistor R5 is connected to the positive electrode of the diode D4, and the negative electrode of the diode D4 is respectively connected to the first end of the resistor R6, the first end of the capacitor C3 and the first MCU31;

[0069] The second end of the resistor R6 and the second end of the capacitor C3 are both grounded.

[0070] Furthermore, a first end of the resistor R4 is connected to a live wire of the common power source 1 .

[0071] Therefore, after the common power supply is divided by resistors R4, R5 and R6, the first MCU31 performs voltage detection, and combined with the anti-backflow function of diode D4 and the filtering function of capacitor C3, the first MCU31 obtains a more accurate voltage value, thereby accurately judging the voltage state of the common power supply as normal voltage / undervoltage / overvoltage.

[0072] In a possible implementation, Figure 2 As shown, the first switch control module 34 includes a first electromagnet 341, a first electromagnetic protection submodule 342, a first controllable switch submodule 343, a first current limiting submodule 344 and a first anti-interference submodule 345;

[0073] The first electromagnetic protection submodule 342 includes a diode D3; the first controllable switch submodule 343 includes a thyristor switch tube T1; the first current limiting submodule 344 includes a resistor R7; the first anti-interference submodule 345 includes a capacitor C4;

[0074] The cathode of the diode D3 is connected to the common power supply 1 and the first electromagnet 341 respectively; the anode of the diode D3 is connected to the first electromagnet 341 and the first end of the thyristor switch tube T1 respectively; the second end of the thyristor switch tube T1 is connected to the first end of the resistor R7 and the first end of the capacitor C4 respectively; the second end of the capacitor C4 and the third end of the thyristor switch tube T1 are both grounded; the second end of the resistor R7 is connected to the first MCU31.

[0075] The attraction of the first electromagnet 341 is associated with the closing of the first switch 6 ; when the first electromagnet 341 is attracted, the first switch 6 can be closed by the suction force; when the first electromagnet 341 is released, the first switch 6 is opened.

[0076] Therefore, the first MCU31 controls the voltage at the second end of the resistor R7 to realize the on-off control of the thyristor switch tube T1 and the attraction or release control of the first electromagnet 341, and finally realizes the on-off control of the first switch 6; in addition, combined with the protection of the diode D3 on the discharge of the first electromagnet, the current limiting function of the resistor R7 and the anti-interference function of the capacitor C4, the circuit reliability is improved.

[0077] In a possible implementation, Figure 2 As shown, the first power detection and control circuit 3 further includes a first LED indication module 35; the first LED indication module 35 is used to indicate the voltage state of the common power supply 1, and the first LED indication module 35 includes a resistor R8 and a first LED lamp;

[0078] After the resistor R8 and the first LED lamp are connected in series, one end of the resistor R8 is connected to the output end of the first MCU power supply module 32 , and the other end is connected to the first MCU 31 .

[0079] Furthermore, the resistor R8 plays a certain role in current limiting protection. The first MCU 31 can indicate the voltage state of the common power supply 1 by controlling the voltage value of the first LED lamp. For example, when the common power supply 1 is in an undervoltage or overvoltage state, the first LED lamp is on; when the common power supply 1 is in a normal voltage state, the first LED lamp is off. The first LED indication module 35 is used to conveniently display the current voltage state of the common power supply 1.

[0080] In a possible implementation, Figure 3 As shown, the state detection circuit 5 includes an optical coupler and a resistor R9; the optical coupler includes a light emitting diode and a phototransistor;

[0081] The first end of the light emitting diode is connected to the first power detection and control circuit 3 through the resistor R9, and the second end is connected to the first power detection and control circuit 3; the first end of the phototransistor is connected to the second power detection and control circuit 4, and the second end is grounded;

[0082] The second power detection and control circuit 4 determines the state of the first power detection and control circuit 3 by detecting the current of the phototransistor.

[0083] Specifically, the first end of the light-emitting diode is connected to the output end of the first MCU power supply module 32 through the resistor R9, and the second end is connected to the first MCU31; the first end of the phototransistor is connected to the second power detection and control circuit 4, and the second end is grounded; specifically, the first end of the phototransistor is connected to the second MCU41 in the second power detection and control circuit 4;

[0084] The second MCU 41 determines the state of the first MCU 31 by detecting the current of the phototransistor.

[0085] The use of an optical coupler in the state detection circuit 5 not only realizes the isolation between the two power supplies, but also enables the second power detection and control circuit 4 to obtain the working state information of the first power detection and control circuit 3 .

[0086] In a possible implementation manner, the specific circuit design of the second power detection and control circuit 4 may refer to the specific circuit design of the first power detection and control circuit 3, such as Figure 4 As shown:

[0087] The second power supply detection and control circuit 4 includes a second MCU 41 , a second MCU power supply module 42 , a second voltage sampling module 43 , a second switch control module 44 , and a second LED indication module 45 .

[0088] The input end of the second MCU power supply module 42 is connected to the backup power supply 2, and the output end is connected to the second MCU 41; the input end of the second voltage sampling module 43 is connected to the backup power supply 2, and the output end is connected to the second MCU 41; the second switch control module 44 is connected to the backup power supply 2 and the second MCU 41 respectively;

[0089] The second MCU power supply module 42 converts the output voltage of the backup power supply 2 into a second voltage and outputs it to the second MCU 41; the second voltage is used to provide power for the operation of the second MCU 41;

[0090] The second MCU 41 detects the voltage of the backup power supply 2 through the second voltage sampling module 43, enters the working state, and drives the second switch 7 to close by controlling the second switch control module 44; or detects the voltage of the backup power supply 2 through the second voltage sampling module 43, enters the standby state, and disconnects the second switch 7.

[0091] Specifically, the second MCU power supply module 42 includes a second voltage protection submodule 421, a second voltage reduction submodule 422, a second rectifier submodule 423, a second voltage stabilization submodule 424, and a fourth filter submodule 425;

[0092] The second voltage sampling module 43 includes a second voltage dividing submodule 431, a second protection submodule 432, and a third filtering submodule 433;

[0093] The second switch control module 44 includes a second electromagnet 441 , a second electromagnetic protection submodule 442 , a second controllable switch submodule 443 , a second current limiting submodule 444 and a second anti-interference submodule 445 .

[0094] Furthermore, the specific circuit design of the second MCU power supply module 42, the second voltage sampling module 43, the second switch control module 44, and the second LED indication module 45, the design, connection and working principle of the related components are Figure 2 The design, connection and working principle of the first power supply detection and control circuit 3 are the same. Those skilled in the art can build them by themselves with reference to the above description, which will not be repeated here.

[0095] In a possible implementation, the dual power supply control circuit further includes a dip switch, which is respectively connected to the first MCU31 in the first power supply detection and control circuit 3 and the second MCU41 in the second power supply detection and control circuit 4;

[0096] The dip switch is used to control the connection mode of the first switch 6 and the second switch 7, and the connection mode includes manual connection and automatic connection: when the dip switch is in the automatic connection mode, the first MCU31 in the first power detection and control circuit 3 can control the on and off of the first switch 6, and the second MCU41 in the second power detection and control circuit 4 can control the on and off of the second switch 7; when the dip switch is in the manual connection mode, the first MCU31 in the first power detection and control circuit 3 cannot control the on and off of the first switch 6, and the second MCU41 in the second power detection and control circuit 4 cannot control the on and off of the second switch 7.

[0097] An embodiment of the present application provides an electronic device, comprising the dual power supply control circuit described in the above embodiment.

[0098] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dual power supply control circuit, characterized in that: It comprises a normal power supply (1), a backup power supply (2), a first power supply detection and control circuit (3), a second power supply detection and control circuit (4), a state detection circuit (5), a first switch (6) and a second switch (7); The normal power supply (1) is connected to the load via the first switch (6), and the backup power supply (2) is connected to the load via the second switch (7); the input end of the first power supply detection and control circuit (3) is connected to the normal power supply (1), and the output end is connected to the input end of the state detection circuit (5); the input end of the second power supply detection and control circuit (4) is respectively connected to the output ends of the backup power supply (2) and the state detection circuit (5); The first power supply detection and control circuit (3) detects the voltage of the common power supply (1) and enters a working state, driving the first switch (6) to close so that the common power supply (1) supplies power to the load; or detects the voltage of the common power supply (1) and enters a standby state so that the first switch (6) is opened; The second power supply detection and control circuit (4) detects the state of the first power supply detection and control circuit (3) through the state detection circuit (5); when the first power supply detection and control circuit (3) is in the working state, the second power supply detection and control circuit (4) enters the standby state, and the second switch (7) is disconnected; when the first power supply detection and control circuit (3) is in the standby state, the second power supply detection and control circuit (4) enters the working state by detecting the voltage of the backup power supply (2), and drives the second switch (7) to close, so that the backup power supply (2) supplies power to the load.

2. The dual power supply control circuit according to claim 1, characterized in that: The first power supply detection and control circuit (3) comprises a first MCU (31), a first MCU power supply module (32), a first voltage sampling module (33), and a first switch control module (34); The input end of the first MCU power supply module (32) is connected to the common power supply (1), and the output end is connected to the first MCU (31); the input end of the first voltage sampling module (33) is connected to the common power supply (1), and the output end is connected to the first MCU (31); the first switch control module (34) is respectively connected to the common power supply (1) and the first MCU (31); The first MCU power supply module (32) converts the output voltage of the common power supply (1) into a first voltage and outputs the first voltage to the first MCU (31); the first voltage is used to provide electric energy for the operation of the first MCU (31); The first MCU (31) detects the voltage of the common power supply (1) through the first voltage sampling module (33), enters a working state, and drives the first switch (6) to close by controlling the first switch control module (34); or detects the voltage of the common power supply (1) through the first voltage sampling module (33), enters a standby state, and disconnects the first switch (6).

3. The dual power supply control circuit according to claim 2, characterized in that: The first MCU power supply module (32) comprises a first voltage protection submodule (321), a first voltage reduction submodule (322), a first rectifier submodule (323), a first voltage stabilization submodule (324) and a second filtering submodule (325); The first voltage protection submodule (321) includes a varistor RM1; the first voltage step-down submodule includes a resistor R1, a resistor R2, a resistor R3 and a capacitor C1; the first rectifier submodule (323) includes a diode D1 and a diode D2; the first voltage stabilizing submodule (324) includes a voltage stabilizing diode DZ1; the second filtering submodule (325) includes a capacitor C2; The first end of the varistor RM1 and the first end of the resistor R3 are both connected to the common power supply (1); the second end of the resistor R3 is respectively connected to the first end of the resistor R2 and the first end of the capacitor C1; the second end of the resistor R2 is connected to the first end of the resistor R1; the second end of the resistor R1 is respectively connected to the second end of the capacitor C1, the positive electrode of the diode D1 and the negative electrode of the diode D2; the negative electrode of the diode D1 is respectively connected to the negative electrode of the voltage-stabilizing diode DZ1, the positive electrode of the capacitor C2 and the first MCU (31); The second end of the varistor RM1, the anode of the diode D2, the anode of the voltage-stabilizing diode DZ1 and the cathode of the capacitor C2 are all grounded.

4. The dual power supply control circuit according to claim 2, characterized in that: The first voltage sampling module (33) comprises a first voltage dividing submodule (331), a first protection submodule (332) and a first filtering submodule (333); The first voltage dividing submodule (331) includes a resistor R4, a resistor R5 and a resistor R6; the first protection submodule (332) includes a diode D4; the first filtering submodule (333) includes a capacitor C3; The first end of the resistor R4 is connected to the common power supply (1); the second end of the resistor R4 is connected to the first end of the resistor R5; the second end of the resistor R5 is connected to the positive electrode of the diode D4, and the negative electrode of the diode D4 is respectively connected to the first end of the resistor R6, the first end of the capacitor C3 and the first MCU (31); The second end of the resistor R6 and the second end of the capacitor C3 are both grounded.

5. The dual power supply control circuit according to claim 2, characterized in that: The first switch control module (34) comprises a first electromagnet (341), a first electromagnetic protection submodule (342), a first controllable switch submodule (343), a first current limiting submodule (344) and a first anti-interference submodule (345); The first electromagnetic protection submodule (342) includes a diode D3; the first controllable switch submodule (343) includes a thyristor switch tube T1; the first current limiting submodule (344) includes a resistor R7; the first anti-interference submodule (345) includes a capacitor C4; The cathode of the diode D3 is respectively connected to the common power supply (1) and the first electromagnet (341); the anode of the diode D3 is respectively connected to the first electromagnet (341) and the first end of the thyristor switch tube T1; the second end of the thyristor switch tube T1 is respectively connected to the first end of the resistor R7 and the first end of the capacitor C4; the second end of the capacitor C4 and the third end of the thyristor switch tube T1 are both grounded; and the second end of the resistor R7 is connected to the first MCU (31).

6. The dual power supply control circuit according to claim 2, characterized in that: The first power supply detection and control circuit (3) further comprises a first LED indication module (35); the first LED indication module (35) is used to indicate the voltage state of the common power supply (1), and the first LED indication module (35) comprises a resistor R8 and a first LED lamp; After the resistor R8 and the first LED lamp are connected in series, one end is connected to the output end of the first MCU power supply module (32), and the other end is connected to the first MCU (31).

7. The dual power supply control circuit according to claim 1, characterized in that: The state detection circuit (5) comprises an optical coupler and a resistor R9; the optical coupler comprises a light emitting diode and a phototransistor; The first end of the light emitting diode is connected to the first power detection and control circuit (3) through the resistor R9, and the second end is connected to the first power detection and control circuit (3); the first end of the phototransistor is connected to the second power detection and control circuit (4), and the second end is grounded; The second power supply detection and control circuit (4) determines the state of the first power supply detection and control circuit (3) by detecting the current of the phototransistor.

8. An electronic device, characterized in that: It comprises the dual power supply control circuit as described in any one of claims 1 to 7.

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