Automatic switching circuit and automatic switching controller

Abstract

The utility model discloses an automatic switching circuit and an automatic switching controller, and relates to the technical field of power supply, and the automatic switching circuit is characterized in that one end of a first driving power supply is electrically connected with a detection unit, a main control unit and a switch unit, and the other end of the first driving power supply is electrically connected with an AC power supply; one end of the second driving power supply is electrically connected with the detection unit, the main control unit and the switch unit, and the other end of the second driving power supply is electrically connected with the AC power supply; the detection unit is used for detecting voltage signals of the first driving power supply and the second driving power supply; the main control unit is used for controlling the working state of the switch unit according to the detected voltage signal; and the switch unit is used for controlling connection and disconnection of lines between the first driving power supply and the load and between the second driving power supply and the load, and is also used for disconnecting the lines between the driving power supplies and the load when the first driving power supply and the second driving power supply are under-voltage and over-voltage. Therefore, the problem that the service life of the component is greatly influenced when the driving power supply is used under overvoltage of the component can be solved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to an automatic switching circuit and an automatic switching controller. Background Art

[0002] Most of the existing automatic switching controllers only consider the situation when multiple driving power supplies are connected in parallel when designing the circuit. The load only uses one power supply at a time. If one power supply is damaged, the controller will automatically switch to other power supplies. At this time, the switch is often set to an interlocked state to quickly achieve the purpose of switching the power supply. However, when all driving power supplies are under-voltage or over-voltage, the switch interlock setting to switch the load to use the driving power supply will not only greatly reduce the life span, but also directly burn the load in use when all driving power supplies are short-circuited or damaged. Utility Model Content

[0003] The main purpose of the present application is to provide an automatic switching circuit, which aims to solve the technical problem that not only the service life of the components is greatly affected when the driving power supply is undervoltage or overvoltage, but also when the switch is set to an interlocking state, all the driving power supplies are short-circuited or damaged, which will directly damage the components using the driving power supply.

[0004] To achieve the above object, the present application proposes an automatic switching circuit, the automatic switching circuit comprising:

[0005] A first driving power supply, one end of which is electrically connected to the detection unit, the main control unit and the switch unit, respectively, and the other end of which is electrically connected to the AC power supply;

[0006] A second driving power supply, one end of which is electrically connected to the detection unit, the main control unit and the switch unit, and the other end of which is electrically connected to the AC power supply;

[0007] A detection unit, the detection unit is electrically connected to the main control unit and is used to detect voltage signals of the first driving power supply and the second driving power supply;

[0008] a main control unit, the main control unit being electrically connected to the switch unit and configured to control a working state of the switch unit according to a detected voltage signal;

[0009] A switch unit is electrically connected to the load and is used to control the on / off of the line between the first drive power supply and the second drive power supply and the load, and is also used to disconnect the line between the first drive power supply and the second drive power supply and the load when the first drive power supply and the second drive power supply are under-voltage or over-voltage.

[0010] In one embodiment, the detection unit comprises:

[0011] a first detection subunit, the first detection subunit being electrically connected to the first driving power supply, the first detection subunit being electrically connected to the main control unit, and being used to detect a voltage signal of the first driving power supply;

[0012] The second detection subunit is electrically connected to the second driving power supply, and the second detection subunit is electrically connected to the main control unit, and is used to detect the voltage signal of the second driving power supply.

[0013] In one embodiment, the switch unit comprises:

[0014] A first controllable switch, the first controllable switch is electrically connected to the first driving power supply, the first controllable switch is electrically connected to the main control unit, and is used to control the on / off of a line between the first driving power supply and the load;

[0015] A second controllable switch, the second controllable switch is electrically connected to the second driving power supply, and the second controllable switch is electrically connected to the main control unit, and is used to control the on-off of the line between the second driving power supply and the load.

[0016] In one embodiment, the switch unit further includes:

[0017] a third controllable switch, the third controllable switch being electrically connected to the first controllable switch and the second controllable switch respectively, the third controllable switch being electrically connected to the main control unit, and the third controllable switch being electrically connected to the load, and being used for disconnecting the line between the first drive power supply and the second drive power supply and the load when the first drive power supply and the second drive power supply are under-voltage or over-voltage.

[0018] In one embodiment, the automatic switching circuit further includes:

[0019] A prompt unit, the prompt unit is electrically connected to the main control unit and is used to prompt the working status of the switching unit.

[0020] In one embodiment, the first controllable switch and the second controllable switch are interlocked.

[0021] In one embodiment, the first controllable switch is normally closed, the second controllable switch is normally open, and the first controllable switch and the second controllable switch are interlocked.

[0022] In one embodiment, the third controllable switch is normally closed.

[0023] In one embodiment, the first detection subunit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first capacitor, a second capacitor, a first diode, a second diode, a first comparator and a second comparator; a first end of the fourth resistor and a first end of the ninth resistor are electrically connected to the first driving power supply, a second end of the fourth resistor is electrically connected to a first end of the second resistor, a first end of the third resistor and a first end of the first capacitor, a second end of the second resistor, a second end of the first capacitor, a second end of the first resistor and a fourth end of the first comparator are grounded, a second end of the third resistor and a second end of the first resistor are electrically connected to a first end of the first comparator, a second end of the first comparator is electrically connected to a first end of the fifth resistor and a first end of the sixth The first end of the resistor is electrically connected, the output end of the first comparator is electrically connected to the anode of the first diode, the second end of the fifth resistor and the first end of the seventh resistor are grounded, the second end of the sixth resistor and the first end of the eighth resistor are electrically connected to the reference current end, the second end of the seventh resistor and the second end of the eighth resistor are electrically connected to the fifth end of the second comparator, the sixth end of the second comparator is electrically connected to the first end of the tenth resistor and the first end of the eleventh resistor, the second end of the tenth resistor is electrically connected to the first end of the second capacitor, the first end of the twelfth resistor and the second end of the ninth resistor, the second end of the twelfth resistor, the second end of the second capacitor and the second end of the eleventh resistor are grounded, the output end of the second comparator is electrically connected to the anode of the second diode, and the cathode of the first diode and the cathode of the second diode are electrically connected to the main control unit.

[0024] In addition, to achieve the above objectives, the present application also proposes an automatic switching controller, which includes the automatic switching circuit as described above.

[0025] One or more technical solutions proposed in this application have at least the following technical effects:

[0026] The automatic switching circuit includes: a first driving power supply, one end of the first driving power supply is electrically connected to the detection unit, the main control unit and the switch unit respectively, and the other end of the first driving power supply is electrically connected to the AC power supply; a second driving power supply, one end of the second driving power supply is electrically connected to the detection unit, the main control unit and the switch unit respectively, and the other end of the second driving power supply is electrically connected to the AC power supply; a detection unit, the detection unit is electrically connected to the main control unit and is used to detect the voltage signals of the first driving power supply and the second driving power supply; a main control unit, the main control unit is electrically connected to the switch unit and is used to control the working state of the switch unit according to the detected voltage signal; a switch unit, the switch unit is electrically connected to the load and is used to control the connection and disconnection of the line between the first driving power supply and the second driving power supply and the load, and is also used to disconnect the line between the first driving power supply and the second driving power supply and the load when the first driving power supply and the second driving power supply are under-voltage or over-voltage. Thus, the main control unit controls the switch unit to switch on the first driving power supply or the second driving power supply for use by the load according to the voltage signal detected by the detection unit, and when the detection unit detects that the first driving power supply and the second driving power supply are over-voltage or under-voltage or damaged, the main control unit controls the switch unit to disconnect the conduction between the first driving power supply and the second driving power supply and the load line. This can solve the technical problem that not only the service life of components is greatly affected when the driving power supply is used due to under-voltage or over-voltage, but also the components using the driving power supply will be directly damaged when the switch is set to an interlocking state and all driving power supplies are short-circuited or damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 A circuit system block diagram provided for the first embodiment of the automatic switching circuit and the automatic switching controller of the present application;

[0030] Figure 2 A structural diagram of a detection unit provided in Embodiment 2 of the automatic switching circuit and automatic switching controller of the present application;

[0031] Figure 3This is a line connection diagram between the first driving power supply, the second driving power supply and the switch unit provided in the third embodiment of the automatic switching circuit and the automatic switching controller of the present application.

[0032] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0034] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0035] The main solution of the embodiment of the present application is to solve the technical problem that not only the service life of the components is greatly affected when the driving power supply is under-voltage or over-voltage, but also when the switch is set to an interlocking state, all driving power supplies are short-circuited or damaged, which will directly damage the components using the driving power supply.

[0036] The present application provides a solution, which enables an automatic switching circuit and an automatic switching controller to control the switch unit to switch on the first driving power supply or the second driving power supply for use by the load through the main control unit according to the voltage signal detected by the detection unit, and when the detection unit detects that the first driving power supply and the second driving power supply are over-voltage or under-voltage or damaged, the main control unit controls the switch unit to disconnect the conduction between the first driving power supply and the second driving power supply and the load line, so that because the detection unit is set, the main control circuit can switch to use another driving power supply when one driving power supply is under-voltage or over-voltage, and because of the setting of the switch unit, it can avoid the situation where the load continues to work when both driving power supplies are under-voltage or over-voltage, and because when one driving power supply has no power output or is short-circuited, the detection unit can also send an abnormal voltage signal to avoid direct damage to the circuit and the load.

[0037] Please refer to Figure 1 , the automatic switching circuit comprises:

[0038] A first driving power supply 11, one end of the first driving power supply 11 is electrically connected to the detection unit 2, the main control unit 3 and the switch unit 4 respectively, and the other end of the first driving power supply 11 is electrically connected to the AC power supply;

[0039] A second driving power supply 12, one end of the second driving power supply 12 is electrically connected to the detection unit 2, the main control unit 3 and the switch unit 4 respectively, and the other end of the second driving power supply 12 is electrically connected to the AC power supply;

[0040] A detection unit 2, the detection unit 2 is electrically connected to the main control unit 3, and is used to detect voltage signals of the first driving power source 11 and the second driving power source 12;

[0041] A main control unit 3, the main control unit 3 is electrically connected to the switch unit 4, and is used to control the working state of the switch unit 4 according to the detected voltage signal;

[0042] The switch unit 4 is electrically connected to the load 5 and is used to control the on / off of the line between the first drive power supply 11 and the second drive power supply 12 and the load 5, and is also used to disconnect the line between the first drive power supply 11 and the second drive power supply 12 and the load 5 when the first drive power supply 11 and the second drive power supply 12 are under-voltage or over-voltage.

[0043] In this embodiment, the first driving power supply 11 is obtained by transforming the AC power supply by a voltage regulating circuit to reduce or increase the voltage, and then converting the AC power into DC power through a rectifier circuit, and removing the ripple of the DC power through a filter circuit to generate a smooth DC power for use by the load 5; the second driving power supply 12 can be obtained as described above by the first driving power supply 11; the detection unit 2 can be installed on the circuit wire using a current transformer to measure the current value using the electromagnetic induction principle, or a current sampling method can be selected to set a sampling resistor on the wire of the first driving power supply 11 or the second driving power supply 12, and detect whether the driving power supply is under-voltage or abnormal through a comparator; the main control unit 3 can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc.; the switch unit 4 can be implemented by thyristors, transistors, field effect transistors, thyristors, relays and other electronic switches.

[0044] Specifically, the first driving power supply 11 and the second driving power supply 12 perform current detection through the detection unit 2, and when the detection unit 2 detects that the first driving power supply 11 or the second driving power supply 12 is abnormal, the main control unit 3 switches to use the driving power supply by controlling the switch unit 4, and when the detection unit 2 detects that both the first driving power supply 11 and the second driving power supply 12 are abnormal, the main control unit 3 disconnects the use of the driving power supply by controlling the switch unit 4, wherein, when the first driving power supply 11 and the second driving power supply 12 are used normally, the default setting is that the load 5 uses the first driving power supply 11.

[0045] In one embodiment, the detection unit 2 comprises:

[0046] a first detection subunit 21, the first detection subunit 21 is electrically connected to the first driving power source 11, and the first detection subunit 21 is electrically connected to the main control unit 3, and is used to detect a voltage signal of the first driving power source 11;

[0047] The second detection subunit 22 is electrically connected to the second driving power source 12 , and the second detection subunit 22 is electrically connected to the main control unit 3 , and is used to detect a voltage signal of the second driving power source 12 .

[0048] In this embodiment, the first detection subunit 21 and the second detection subunit 22 can select a current detection IC, a current sensor, and set a sampling resistor to detect the voltage by detecting the driving power supply through a comparator.

[0049] Specifically, the first detection subunit 21 detects the voltage signal of the first driving power supply 11, and when the first driving power supply 11 is overvoltage or undervoltage, the first detection subunit 21 sends a first voltage abnormality signal to the main control unit 3, and the main control unit 3 switches to use the second driving power supply 12; the second detection subunit 22 detects the voltage signal of the second driving power supply 12, and when the second driving power supply 12 is overvoltage or undervoltage, the second detection subunit 22 sends a second voltage abnormality signal to the main control unit 3, and the main control unit 3 switches to use the first driving power supply 11. If the main control unit 3 receives the first voltage abnormality signal and the second voltage abnormality signal at the same time, the main control unit 3 disconnects the lines between the first driving power supply 11 and the second driving power supply 12 and the load 5.

[0050] In one embodiment, please refer to Figure 3 , the switch unit 4 comprises:

[0051] A first controllable switch 41, the first controllable switch 41 is electrically connected to the first driving power supply 11, and the first controllable switch 41 is electrically connected to the main control unit 3, and is used to control the on / off of the line between the first driving power supply 11 and the load 5;

[0052] The second controllable switch 42 is electrically connected to the second driving power supply 12 , and the second controllable switch 42 is electrically connected to the main control unit 3 , and is used to control the on / off of the line between the second driving power supply 12 and the load 5 .

[0053] In this embodiment, the first controllable switch 41 and the second controllable switch 42 can be configured by setting a plurality of resistors and transistors, wherein the plurality of resistors provide bias currents for the transistors, and the on and off of the transistors are controlled by the main control unit 3, so that the automatic switching circuit can switch between the first driving power supply 11 and the second driving power supply 12.

[0054] In one embodiment, the switch unit 4 further includes:

[0055] The third controllable switch 43 is electrically connected to the first controllable switch 41 and the second controllable switch 42 respectively, the third controllable switch 43 is electrically connected to the main control unit 3, and the third controllable switch 43 is electrically connected to the load 5, and is used for disconnecting the line between the first drive power supply 11 and the second drive power supply 12 and the load 5 when the first drive power supply 11 and the second drive power supply 12 are under-voltage or over-voltage.

[0056] In this embodiment, the internal setting of the third controllable switch 43 can be the same as the first controllable switch 41. The third controllable switch 43 is arranged between the first controllable switch 41, the second controllable switch 42 and the load 5. The third controllable switch 43 can simultaneously cut off or turn on the line connection between the first controllable switch 41, the second controllable switch 42 and the load 5.

[0057] In one embodiment, the automatic switching circuit further includes:

[0058] A prompt unit, which is electrically connected to the main control unit 3 and is used to prompt the working status of the switching unit 4.

[0059] In this embodiment, the prompt unit can use buzzer, light, voice broadcast and vibration to prompt the working state of the switching unit 4.

[0060] In one embodiment, the first controllable switch 41 is normally closed, the second controllable switch 42 is normally open, and the first controllable switch 41 and the second controllable switch 42 are interlocked.

[0061] In this embodiment, the first controllable switch 41 is normally closed and the second controllable switch 42 is normally open, so that the automatic switching circuit uses the first driving power supply 11 by default. The first controllable switch 41 and the second controllable switch 42 are interlocked, so that the automatic switching circuit can automatically switch to the second driving power supply 12 when the first driving power supply 11 is abnormal.

[0062] In one embodiment, the third controllable switch 43 is normally closed.

[0063] In one embodiment, please refer to Figure 2 , the first detection subunit 21 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2, a first comparator U1A and a second comparator U2A; a first end of the fourth resistor R4 and a first end of the ninth resistor R9 are electrically connected to the first driving power source 11, a second end of the fourth resistor R4 is electrically connected to a first end of the second resistor R2, a first end of the third resistor R3 and a first end of the first capacitor C1, a second end of the second resistor R2, a second end of the first capacitor C1, a second end of the first resistor R1 and a fourth end of the first comparator U1A are grounded, a second end of the third resistor R3 and a second end of the first resistor R1 are electrically connected to a first end of the first comparator U1A, a second end of the first comparator U1A is electrically connected to a first end of the fifth resistor R5 The first comparator U1A is electrically connected to the anode of the first diode D1, the second end of the fifth resistor R5 and the first end of the seventh resistor R7 are grounded, the second end of the sixth resistor R6 and the first end of the eighth resistor R8 are electrically connected to the reference current end, the second end of the seventh resistor R7 and the second end of the eighth resistor R8 are electrically connected to the fifth end of the second comparator U2A, the sixth end of the second comparator U2A is electrically connected to the first end of the tenth resistor R10 and the first end of the eleventh resistor R11, the second end of the tenth resistor R10 is electrically connected to the first end of the second capacitor C2, the first end of the twelfth resistor R12 and the second end of the ninth resistor R9, the second end of the twelfth resistor R12, the second end of the second capacitor C2 and the second end of the eleventh resistor R11 are grounded, the output end of the second comparator U2A is electrically connected to the anode of the second diode D2, and the cathode of the first diode D1 and the cathode of the second diode D2 are electrically connected to the main control unit 3.

[0064] In this embodiment, the second resistor R2 and the fourth resistor R4 are overvoltage sampling resistors, the fifth resistor R5 and the sixth resistor R6 are voltage sampling resistors for overvoltage comparison reference, and the first comparator U1A is an overvoltage comparator; the ninth resistor R9 and the twelfth resistor R12 are undervoltage sampling resistors, the seventh resistor R7 and the eighth resistor R8 are voltage sampling resistors for undervoltage comparison reference, the second comparator U2A is an undervoltage comparator, and the IN1 terminal is the power supply output by the first driving power supply 11; the REF terminal can provide a stable reference voltage. When the first driving power supply 11 is overvoltage, the voltage at the in-phase terminal of the first comparator U1A is higher than the voltage at the inverting terminal, and a high level is output, which is output to the main control unit 3 through the OUT1 terminal. When the circuit is undervoltage, the voltage at the inverting terminal of the second comparator U2A is lower than the voltage at the in-phase terminal, and a high level is output, which is output to the main control unit 3 through the OUT1 terminal. The main control unit 3 can determine the abnormality of the voltage of the first driving power supply 11 according to the level state of the OUT1 terminal, and then select the state of the switch unit 4; wherein, since when the first driving power supply 11 has no power output, it is also less than the reference voltage of the second comparator U2A, and can also send out an abnormal voltage, it can be referred to Figure 3 A first fuse FU1 is also provided between the first driving power supply 11 and the first detecting sub-unit 21. When the first driving power supply 11 is short-circuited, the first driving power supply 11 and the first detecting sub-unit 21 are disconnected. The first detecting sub-unit 21 can also detect the abnormality of the first driving power supply 11 and send out a first voltage abnormality signal of the first driving power supply 11. This setting is to protect the first detecting sub-unit 21 from being damaged by a short circuit. The structural setting of the second detecting sub-unit 22 is similar to that of the first detecting sub-unit 21, so they are not described one by one.

[0065] The present application also provides an automatic switching controller, which includes the automatic switching circuit as described above.

[0066] The automatic switching circuit provided in the present application includes: a first driving power supply 11, one end of the first driving power supply 11 is electrically connected to the detection unit 2, the main control unit 3 and the switch unit 4 respectively, and the other end of the first driving power supply 11 is electrically connected to the AC power supply; a second driving power supply 12, one end of the second driving power supply 12 is electrically connected to the detection unit 2, the main control unit 3 and the switch unit 4 respectively, and the other end of the second driving power supply 12 is electrically connected to the AC power supply; the detection unit 2, the detection unit 2 is electrically connected to the main control unit 3, and is used to detect the voltage signal of the first driving power supply 11 and the second driving power supply 12; the main control unit 3, the main control unit 3 is electrically connected to the switch unit 4, and is used to control the working state of the switch unit 4 according to the detected voltage signal; the switch unit 4, the switch unit 4 is electrically connected to the load 5, and is used to control the line between the first driving power supply 11 and the second driving power supply 12 and the load 5. The line between the first driving power supply 11 and the second driving power supply 12 and the load 5 is disconnected when the first driving power supply 11 and the second driving power supply 12 are under-voltage or over-voltage. Thus, the main control unit 3 controls the switch unit 4 to switch on the first driving power supply 11 or the second driving power supply 12 for use by the load 5 according to the voltage signal detected by the detection unit 2, and when the detection unit 2 detects that the first driving power supply 11 and the second driving power supply 12 are over-voltage or under-voltage or damaged, the main control unit 3 controls the switch unit 4 to disconnect the conduction between the first driving power supply 11 and the second driving power supply 12 and the load 5 line, thereby solving the technical problem that not only the service life of components is greatly affected when the driving power supply is used due to under-voltage or over-voltage, but also the components using the driving power supply will be directly damaged when the switch is set to an interlocking state and all driving power supplies are short-circuited or damaged.

[0067] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An automatic switching circuit, characterized in that: The automatic switching circuit comprises: A first driving power supply, one end of which is electrically connected to the detection unit, the main control unit and the switch unit, respectively, and the other end of which is electrically connected to the AC power supply; A second driving power supply, one end of which is electrically connected to the detection unit, the main control unit and the switch unit, and the other end of which is electrically connected to the AC power supply; A detection unit, the detection unit is electrically connected to the main control unit and is used to detect voltage signals of the first driving power supply and the second driving power supply; a main control unit, the main control unit being electrically connected to the switch unit and configured to control a working state of the switch unit according to a detected voltage signal; A switch unit is electrically connected to the load and is used to control the on / off of the line between the first drive power supply and the second drive power supply and the load, and is also used to disconnect the line between the first drive power supply and the second drive power supply and the load when the first drive power supply and the second drive power supply are under-voltage or over-voltage.

2. The automatic switching circuit according to claim 1, characterized in that: The detection unit comprises: a first detection subunit, the first detection subunit being electrically connected to the first driving power supply, the first detection subunit being electrically connected to the main control unit, and being used to detect a voltage signal of the first driving power supply; The second detection subunit is electrically connected to the second driving power supply, and the second detection subunit is electrically connected to the main control unit, and is used to detect the voltage signal of the second driving power supply.

3. The automatic switching circuit according to claim 1, characterized in that: The switch unit comprises: A first controllable switch, the first controllable switch is electrically connected to the first driving power supply, the first controllable switch is electrically connected to the main control unit, and is used to control the on / off of a line between the first driving power supply and the load; A second controllable switch, the second controllable switch is electrically connected to the second driving power supply, and the second controllable switch is electrically connected to the main control unit, and is used to control the on-off of the line between the second driving power supply and the load.

4. The automatic switching circuit according to claim 3, characterized in that: The switch unit further comprises: a third controllable switch, the third controllable switch being electrically connected to the first controllable switch and the second controllable switch respectively, the third controllable switch being electrically connected to the main control unit, and the third controllable switch being electrically connected to the load, and being used for disconnecting the line between the first drive power supply and the second drive power supply and the load when the first drive power supply and the second drive power supply are under-voltage or over-voltage.

5. The automatic switching circuit according to claim 1, characterized in that: The automatic switching circuit also includes: A prompt unit, the prompt unit is electrically connected to the main control unit and is used to prompt the working status of the switching unit.

6. The automatic switching circuit according to claim 3, characterized in that: The first controllable switch is normally closed, the second controllable switch is normally open, and the first controllable switch and the second controllable switch are interlocked.

7. The automatic switching circuit according to claim 4, characterized in that: The third controllable switch is normally closed.

8. The automatic switching circuit according to claim 2, characterized in that: The first detection subunit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a first capacitor, a second capacitor, a first diode, a second diode, a first comparator and a second comparator; a first end of the fourth resistor and a first end of the ninth resistor are electrically connected to the first driving power supply, a second end of the fourth resistor is electrically connected to a first end of the second resistor, a first end of the third resistor and a first end of the first capacitor, a second end of the second resistor, a second end of the first capacitor, a second end of the first resistor and a fourth end of the first comparator are grounded, a second end of the third resistor and a second end of the first resistor are electrically connected to a first end of the first comparator, a second end of the first comparator is electrically connected to a first end of the fifth resistor and a first end of the sixth resistor The first comparator is electrically connected to one end, the output end of the first comparator is electrically connected to the anode of the first diode, the second end of the fifth resistor and the first end of the seventh resistor are grounded, the second end of the sixth resistor and the first end of the eighth resistor are electrically connected to the reference current end, the second end of the seventh resistor and the second end of the eighth resistor are electrically connected to the fifth end of the second comparator, the sixth end of the second comparator is electrically connected to the first end of the tenth resistor and the first end of the eleventh resistor, the second end of the tenth resistor is electrically connected to the first end of the second capacitor, the first end of the twelfth resistor and the second end of the ninth resistor, the second end of the twelfth resistor, the second end of the second capacitor and the second end of the eleventh resistor are grounded, the output end of the second comparator is electrically connected to the anode of the second diode, and the cathode of the first diode and the cathode of the second diode are electrically connected to the main control unit.

9. An automatic switching controller, characterized in that: The automatic switching controller comprises the automatic switching circuit according to any one of claims 1 to 8.

Images