A power supply detection control device

Abstract

The application discloses a power supply detection control device, comprising: a first resistor first end connected with a power supply input end, a first resistor second end connected with a first switch first end, a second resistor first end connected with a first switch second end, a second resistor second end connected with a second switch first end, and a second switch second end connected with a power supply output end; a first power supply detection control circuit connected in parallel with the first resistor; a second power supply detection control circuit connected in parallel with the second resistor; the first power supply detection control circuit is used for controlling the first switch to be turned off when a first power supply signal is abnormal; and the second power supply detection control circuit is used for controlling the second switch to be turned off when a second power supply signal is abnormal. When one power supply detection circuit fails to detect power supply signal abnormality and thus fails to turn off the switch, other power supply detection circuits can still detect power supply signal abnormality and turn off the switch, so that the safety of the circuit is maintained, and the safety of an industrial system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit, in particular to a power supply detection control device. BACKGROUND

[0002] In an industrial control system, a safe and reliable power supply is usually required, and a power supply detection circuit is needed to detect the power supply voltage in real time to maintain the normal operation of the circuit.

[0003] At present, the power supply detection circuit commonly used in industrial control systems has a single design. If the power supply detection circuit fails, it will cause inaccurate detection of the power supply, resulting in safety hazards of the industrial control system. SUMMARY

[0004] Based on the above problems, the present application provides a power supply detection control device, which can still accurately detect the power supply when a single power supply detection circuit fails, improving the safety of the industrial control system.

[0005] The present application discloses the following technical solutions:

[0006] A power supply detection control device, comprising: a first power supply detection control circuit, a second power supply detection control circuit, a first resistor, a first switch, a second resistor and a second switch; the first end of the first resistor is connected with a power supply input end, the second end of the first resistor is connected with the first end of the first switch, the first end of the second resistor is connected with the second end of the first switch, the second end of the second resistor is connected with the first end of the second switch, and the second end of the second switch is connected with a power supply output end; the first power supply detection control circuit is connected in parallel with the first resistor; the second power supply detection control circuit is connected in parallel with the second resistor;

[0007] The first power supply detection control circuit is used for controlling the first switch to be turned off when a first power supply signal is abnormal; the first power supply signal comprises a first current passing through the first resistor and an input voltage;

[0008] The second power supply detection control circuit is used for controlling the second switch to be turned off when a second power supply signal is abnormal; the second power supply signal comprises a second current passing through the second resistor and a first end voltage of the second resistor.

[0009] In some possible implementation manners, the device further comprises: a third power supply detection control circuit, a fourth power supply detection control circuit, a third switch and a fourth switch; the third power supply detection control circuit is connected in parallel with the first power supply detection control circuit; the fourth power supply detection control circuit is connected in parallel with the second power supply detection control circuit;

[0010] The third power supply detection control circuit is used for controlling the third switch to be turned off when the first power supply signal is abnormal;

[0011] The fourth power supply detection control circuit is configured to control the fourth switch to be turned off when the second power supply signal is abnormal.

[0012] In some possible implementation manners, the first power supply detection control circuit comprises a first current detection unit and a first voltage detection unit.

[0013] The first current detection unit is configured to detect a first current value passing through the first resistor, and control the first switch to be turned off when the first current value is greater than a first current threshold value.

[0014] The first voltage detection unit is configured to detect an input voltage value, and control the first switch to be turned off when the input voltage value is overvoltage or undervoltage.

[0015] In some possible implementation manners, the second power supply detection control circuit comprises a second current detection unit and a second voltage detection unit.

[0016] The second current detection unit is configured to detect a second current value passing through the second resistor, and control the second switch to be turned off when the second current value is greater than a second current threshold value.

[0017] The first voltage detection unit is configured to detect an input voltage value, and control the second switch to be turned off when the input voltage value is overvoltage or undervoltage.

[0018] In some possible implementation manners, the third power supply detection control circuit comprises a third current detection unit and a third voltage detection unit.

[0019] The third current detection unit is configured to detect a first current value passing through the first resistor, and control the third switch to be turned off when the first current value is greater than a first current threshold value.

[0020] The third voltage detection unit is configured to detect an input voltage value, and control the third switch to be turned off when the input voltage value is overvoltage or undervoltage.

[0021] In some possible implementation manners, the fourth power supply detection control circuit comprises a fourth current detection unit and a fourth voltage detection unit.

[0022] The fourth current detection unit is configured to detect a second current value passing through the second resistor, and control the fourth switch to be turned off when the second current value is greater than a second current threshold value.

[0023] The fourth voltage detection unit is configured to detect an input voltage value, and control the fourth switch to be turned off when the input voltage value is overvoltage or undervoltage.

[0024] In some possible implementation manners, the first switch and the third switch are closed when the first power signal is normal.

[0025] The second switch and the fourth switch are closed when the second power signal is normal.

[0026] In one possible implementation manner, the device further comprises an anti-reverse connection circuit.

[0027] The anti-reverse connection circuit comprises a first switch tube, a second switch tube, a first capacitor, a second capacitor, a third resistor, a fourth resistor, a fifth resistor and a third switch tube.

[0028] The first end of the first switch tube is connected with a power input end, a first end of the first capacitor and a first end of the third resistor respectively.

[0029] The second end of the first switch tube is connected with a first end of the second switch tube, a second end of the first capacitor, a first end of the second capacitor, a second end of the third resistor, a first end of the fourth resistor, a first end of the fifth resistor respectively, the second end of the second switch tube is connected with a source electrode of the third switch tube, a second end of the second capacitor, a second end of the fourth resistor and a power output end respectively.

[0030] The second end of the fifth resistor is connected with a gate electrode of the third switch tube, and a drain electrode of the third switch tube is connected with the power input end.

[0031] In some possible implementation manners, the third switch tube is a MOS tube.

[0032] In some possible implementation manners, the first switch is a diode, and the second switch tube is a voltage stabilizing diode.

[0033] Compared with the prior art, the application has the following beneficial effects:

[0034] The power supply detection control device provided by the application comprises a first power supply detection control circuit, a second power supply detection control circuit, a first resistor, a first switch, a second resistor and a second switch; the first end of the first resistor is connected with a power supply input end, the second end of the first resistor is connected with the first end of the first switch, the first end of the second resistor is connected with the second end of the first switch, the second end of the second resistor is connected with the first end of the second switch, and the second end of the second switch is connected with a power supply output end; the first power supply detection control circuit is connected with the first resistor in parallel; the second power supply detection control circuit is connected with the second resistor in parallel; the first power supply detection control circuit is used for controlling the first switch to be turned off when a first power supply signal is abnormal; the first power supply signal comprises a first current passing through the first resistor and an input voltage; the second power supply detection control circuit is used for controlling the second switch to be turned off when a second power supply signal is abnormal; the second power supply signal comprises a second current passing through the second resistor and a voltage at the first end of the second resistor. When one power supply detection circuit fails to detect the abnormality of the power supply signal or one switch is short-circuited and thus cannot be turned off, other power supply detection circuits can still detect the abnormality of the power supply signal and turn off the switch, so as to maintain the safety of the circuit and improve the safety of the industrial system. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0036] Figure 1 A design single power supply detection circuit structure schematic diagram is provided for the embodiments of the present application.

[0037] Figure 2 A power supply detection control device structure schematic diagram is provided for the embodiments of the present application.

[0038] Figure 3 Another power supply detection control device structure schematic diagram is provided for the embodiments of the present application.

[0039] Figure 4 Still another power supply detection control device structure schematic diagram is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the embodiments of the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0041] As mentioned earlier, the power detection circuits commonly used in industrial control systems are simply designed. If the power detection circuit malfunctions (e.g., a short circuit in the first switch, a deviation in the sampling resistor parameters, or other component failures), it will lead to inaccurate power detection, creating a safety hazard in the industrial control system. Figure 1 The diagram shows a conventional power supply detection circuit with a single design. Under normal circumstances, the voltage detection module detects the voltage value and sends an electrical signal to the control module. When the electrical signal is abnormal, the control module will control switch k0 to open. When the voltage detection module malfunctions, it cannot detect abnormal voltage even if the circuit voltage is abnormal, and the control module will not control switch k0 to open, resulting in inaccurate power supply detection.

[0042] In view of this, embodiments of this application provide a power detection and control device, comprising: a first power detection and control circuit, a second power detection and control circuit, a first resistor, a first switch, a second resistor, and a second switch; a first terminal of the first resistor is connected to a power input terminal, a second terminal of the first resistor is connected to a first terminal of the first switch, a first terminal of the second resistor is connected to a second terminal of the first switch, a second terminal of the second resistor is connected to a first terminal of the second switch, and a second terminal of the second switch is connected to a power output terminal; the first power detection and control circuit is connected in parallel with the first resistor; the second power detection and control circuit is connected in parallel with the second resistor; the first power detection and control circuit is used to control the first switch to open when the first power signal is abnormal; the first power signal includes a first current through the first resistor and an input voltage; the second power detection and control circuit is used to control the second switch to open when the second power signal is abnormal; the second power signal includes a second current through the second resistor and a first terminal voltage of the second resistor. When one power detection circuit fails and cannot detect the abnormal power signal, and therefore cannot open the switch, other power detection circuits can still detect the abnormal power signal and open the switch, thereby maintaining circuit safety and improving the safety of the industrial system.

[0043] For ease of understanding, the architecture of the power detection and control device provided in the embodiments of this application will be introduced below.

[0044] See Figure 2 , Figure 2 This is a structural diagram of a power detection and control device provided in an embodiment of this application. Figure 2As shown, the power supply detection control device comprises: a first resistor R1, a first switch K1, a second resistor R2 and a second switch K2; a first end of the first resistor R1 is connected with a power supply input terminal VIN, a second end of the first resistor R1 is connected with a first end of the first switch K1, a first end of the second resistor R2 is connected with a second end of the first switch K1, a second end of the second resistor R2 is connected with a first end of the second switch K2, and a second end of the second switch K2 is connected with a power supply output terminal VOUT; the first power supply detection control circuit is connected in parallel with the first resistor R1; and the second power supply detection control circuit is connected in parallel with the second resistor R2.

[0045] The first power supply detection control circuit is configured to control the first switch to be opened when a first power supply signal is abnormal; the first power supply signal comprises a first current passing through the first resistor and an input voltage.

[0046] The second power supply detection control circuit is configured to control the second switch to be opened when a second power supply signal is abnormal; the second power supply signal comprises a second current passing through the second resistor and a first end voltage of the second resistor.

[0047] The embodiment of the present application adopts the first power supply detection control circuit and the second power supply detection control circuit in series for detection. When the K1 is short-circuited or cannot be closed, the second power supply detection control circuit in series for detection can still accurately detect the state of the power supply. When overvoltage, undervoltage or overcurrent faults occur in the power supply, the K2 is controlled to be opened, and the power supply output is turned off, thereby solving the problem that the power supply cannot be turned off when a single fault causes the power supply to be abnormal. When one power supply detection circuit fails (for example, a sampling resistor parameter deviates or other device faults), the power supply signal cannot be detected or one switch is short-circuited, and thus the switch cannot be opened, other power supply detection circuits can still detect the abnormal power supply signal and open the switch, thereby maintaining the safety of the circuit and improving the safety of the industrial system.

[0048] In order to solve the problem that when a single fault causes the K1 to be opened or cannot be closed, the power supply output is turned off in the case of normal input power supply, and the usability of the circuit is poor, the embodiment of the present application further optimizes the first power supply detection control circuit and the second power supply detection control circuit in series for detection, as shown in Figure 3 , Figure 3 Another power supply detection control device structure schematic diagram provided by the embodiment of the present application is shown in FIG. 4. As shown in FIG. 4, the power supply detection control device comprises: a first resistor R1, a first switch K1, a second resistor R2 and a second switch K2; a first end of the first resistor R1 is connected with a power supply input terminal VIN, a second end of the first resistor R1 is connected with a first end of the first switch K1, a first end of the second resistor R2 is connected with a second end of the first switch K1, a second end of the second resistor R2 is connected with a first end of the second switch K2, and a second end of the second switch K2 is connected with a power supply output terminal VOUT; the first power supply detection control circuit is connected in parallel with the first resistor R1; and the second power supply detection control circuit is connected in parallel with the second resistor R2. Figure 3As shown, the embodiment of the present application increases third power supply detection control circuit and fourth power supply detection control circuit, third switch and fourth switch on the basis of adopting first power supply detection control circuit and second power supply detection control circuit in series detection; the third power supply detection control circuit is connected in parallel with the first power supply detection control circuit; the fourth power supply detection control circuit is connected in parallel with the second power supply detection control circuit; the third power supply detection control circuit is used for controlling the third switch to be disconnected when the first power supply signal is abnormal; the fourth power supply detection control circuit is used for controlling the fourth switch to be disconnected when the second power supply signal is abnormal. When the first power supply signal is normal, the first switch and the third switch are closed; when the second power supply signal is normal, the second switch and the fourth switch are closed.

[0049] The embodiment of the present application adopts power supply detection control circuit parallel redundancy detection, and solves the problem of abnormal power-off caused by single fault.

[0050] In some embodiments, the first power supply detection control circuit comprises a first current detection unit and a first voltage detection unit;

[0051] The first current detection unit is used for detecting a first current value passing through the first resistor, and controlling the first switch to be disconnected when the first current value is greater than a first current threshold value;

[0052] The first voltage detection unit is used for detecting an input voltage value, and controlling the first switch to be disconnected when the input voltage value is overvoltage or undervoltage.

[0053] In some possible implementation manners, the second power supply detection control circuit comprises a second current detection unit and a second voltage detection unit;

[0054] The second current detection unit is used for detecting a second current value passing through the second resistor, and controlling the second switch to be disconnected when the second current value is greater than a second current threshold value;

[0055] The second voltage detection unit is used for detecting an input voltage value, and controlling the second switch to be disconnected when the input voltage value is overvoltage or undervoltage.

[0056] In some possible implementation manners, the third power supply detection control circuit comprises a third current detection unit and a third voltage detection unit;

[0057] The third current detection unit is used for detecting a first current value passing through the first resistor, and controlling the third switch to be disconnected when the first current value is greater than a first current threshold value;

[0058] The third voltage detection unit is used for detecting an input voltage value, and controlling the third switch to be disconnected when the input voltage value is overvoltage or undervoltage.

[0059] In some possible implementation manners, the fourth power supply detection control circuit comprises a fourth current detection unit and a fourth voltage detection unit.

[0060] The fourth current detection unit is configured to detect a second current value passing through the second resistor, and control the fourth switch to be turned off when the second current value is greater than a second current threshold.

[0061] The fourth voltage detection unit is configured to detect an input voltage value, and control the fourth switch to be turned off when the input voltage value is overvoltage or undervoltage.

[0062] In some possible implementation manners, the first switch and the third switch are turned on when the first power supply signal is normal.

[0063] The second switch and the fourth switch are turned on when the second power supply signal is normal.

[0064] Affected by the impedance of the sampling resistor R1 and the switches K1 and K3, when the actual load current is large, there is a voltage difference Vk between the two ends of the switch, and V2 is slightly less than VIN. When the VIN voltage decreases or the load current increases, Vk increases, so that the V2 voltage decreases, and V2 < undervoltage detection threshold < VIN. At this time, the 2 and 4 power supply detection control circuits will detect the power supply undervoltage state before the 1 and 3 power supply detection control circuits, and turn off K2 and K4. After K2 and K4 are turned off, the current on the power supply is very small, and the Vk voltage is very small. At this time, the V2 voltage is approximately equal to the VIN voltage, and the V2 voltage is higher than the undervoltage detection threshold. K2 and K4 return to the open state.

[0065] Therefore, when Vk is greater than (VIN-undervoltage detection threshold) voltage detection circuit hysteresis interval, it will cause the K2 and K4 in the next stage to be turned off periodically. At this time, by adjusting the sampling parameters, the undervoltage value of the 1 and 3 voltage detection units and the undervoltage value of the 2 and 4 voltage detection units are greater than (VIN-undervoltage detection threshold). The 2 and 4 power supply detection control circuits are turned off before or slower than the 1 and 3 power supply detection control circuits, forming a front-stage and rear-stage sequential action architecture, which solves the hiccup problem.

[0066] The current detection unit in the embodiment of the application can adopt any circuit or device that can realize overcurrent detection. The voltage detection unit can adopt any circuit or device that can realize overvoltage and undervoltage detection, which is not limited in the embodiment of the application.

[0067] Referring to Figure 4 , Figure 4 Another power supply detection control device structure schematic diagram provided by the embodiment of the application is shown in FIG. 4. Figure 4As shown, the first power detection control circuit includes a first current detection unit, a first voltage detection unit, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7. The first voltage detection unit is used to measure the voltage across the fifth resistor R5, and then according to the principle of voltage division, it can be determined whether the input voltage value VIN is overvoltage or undervoltage, so as to control the first switch K1. The first current detection unit detects the voltage across R1, and then according to Ohm's law, it can detect the current flowing through R1 and determine whether it is overcurrent, so as to control the first switch K1.

[0068] The third power detection control circuit includes a third current detection unit, a third voltage detection unit, an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13. The third voltage detection unit is used to measure the voltage across the twelfth resistor R12, and then according to the principle of voltage division, it can be determined whether the input voltage value VIN is overvoltage or undervoltage, so as to control the first switch K3. The first current detection unit detects the voltage across R1, and then according to Ohm's law, it can detect the current flowing through R1 and determine whether it is overcurrent, so as to control the third switch K3.

[0069] The second power detection control circuit includes a second current detection unit, a second voltage detection unit, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10. The second voltage detection unit is used to measure the voltage across the ninth resistor R9, and then according to the principle of voltage division, it can be determined whether the input voltage value V2 is overvoltage or undervoltage, so as to control the second switch K2. The first current detection unit detects the voltage across R2, and then according to Ohm's law, it can detect the current flowing through R2 and determine whether it is overcurrent, so as to control the second switch K2.

[0070] The fourth power detection control circuit includes a fourth current detection unit, a fourth voltage detection unit, a fourteenth resistor R14, a fifteenth resistor R15 and a sixteenth resistor R16. The fourth voltage detection unit is used to measure the voltage across the fifteenth resistor R15, and then according to the principle of voltage division, it can be determined whether the input voltage value V2 is overvoltage or undervoltage, so as to control the fourth switch K4. The fourth current detection unit detects the voltage across R2, and then according to Ohm's law, it can detect the current flowing through R2 and determine whether it is overcurrent, so as to control the fourth switch K4.

[0071] The embodiments of the present application can detect the abnormal power signal and disconnect the switch when one power detection circuit fails to detect the abnormal power signal or one switch short-circuit fault, and thus cannot disconnect the switch, so as to maintain the safety of the circuit and improve the safety of the industrial system. The third power detection control circuit, the third switch, the fourth power detection control circuit and the fourth switch provided by the embodiments of the present application can detect the normal power signal and ensure the closure of the switch when one power detection circuit fails to detect the normal power signal or one switch open-circuit fault, and thus cannot close the switch, so as to ensure the continuous power supply and improve the stability of the power system.

[0072] In the embodiments as shown in Figure 4 The anti-reverse connection circuit comprises a first switch tube D1, a second switch tube D2, a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a third switch tube U1.

[0073] The first end of the first switch tube D1 is connected with the power input terminal VIN, the first end of the first capacitor C1 and the first end of the third resistor R3 respectively.

[0074] The second end of the first switch tube D1 is connected with the first end of the second switch tube D2, the second end of the first capacitor C1, the first end of the second capacitor C2, the second end of the third resistor R3, the first end of the fourth resistor R4 and the first end of the fifth resistor R5 respectively.

[0075] The second end of the second switch tube D2 is connected with the source electrode of the third switch tube U1, the second end of the second capacitor C2, the second end of the fourth resistor R4 and the power output terminal VOUT respectively.

[0076] The second end of the fifth resistor R5 is connected with the gate electrode of the third switch tube U1, and the drain electrode of the third switch tube U1 is connected with the power input terminal.

[0077] In some embodiments, the third switch tube U1 is a MOS tube.

[0078] In some embodiments, the first switch D1 is a diode, and the second switch tube D2 is a zener diode.

[0079] In the embodiments as shown in Figure 4As shown, the input end of the circuit has an anti-reverse connection circuit, the anti-reverse connection function is realized by a MOS tube circuit, the forward voltage is divided by R3 and R4 and then reaches the MOS gate, and the MOS tube is turned on. The capacitor has the characteristic of passing alternating current, and the start-up capacitor C1 can make the MOS tube conduct quickly when power is on, avoiding incomplete conduction of the MOS tube after the load is powered on; the C2 capacitor is a filter capacitor that filters the divided voltage to prevent signal interference from causing the MOS tube to be mistakenly turned off. When the power supply is overvoltage, the zener diode D2 clamps the MOS tube for protection; when the power supply is reversed, the MOS tube is quickly turned off by R3 and D1 diode, and the reverse voltage is cut off. The anti-reverse connection circuit has the functions of quickly conducting when power is on and quickly cutting off when reversed.

[0080] It should be noted that the term "comprising" and its variations as used herein mean "including but not limited to". The term "based on" means "based, at least in part, on". The term "one embodiment" means "at least one embodiment". The term "another embodiment" means "at least one additional embodiment". The term "some embodiments" means "at least some embodiments". Related definitions will be given in the description below.

[0081] It should be noted that the concepts of "first", "second" and the like mentioned in the present application are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0082] It should be noted that although the subject matter has been described in terms of specific structural features and / or methodological acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely exemplary forms of implementing the claims.

[0083] Although several implementation details have been included in the above discussion, these should not be interpreted as limiting the scope of the application. Certain features described in the context of separate embodiments can also be implemented in combination. Conversely, various features described in the context of a single embodiment can also be implemented separately or in any suitable subcombination.

[0084] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the disclosure in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, but also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A power supply detection and control device, characterized in that, include: A first power supply detection and control circuit, a second power supply detection and control circuit, a first resistor, a first switch, a second resistor, and a second switch; The first end of the first resistor is connected to the power input terminal; the second end of the first resistor is connected to the first end of the first switch; the first end of the second resistor is connected to the second end of the first switch; the second end of the second resistor is connected to the first end of the second switch; and the second end of the second switch is connected to the power output terminal. The first power detection and control circuit is connected in parallel with the first resistor; and the second power detection and control circuit is connected in parallel with the second resistor. The first power detection and control circuit is used to control the first switch to open when the first power signal is abnormal; the first power signal includes a first current through the first resistor and an input voltage; The second power supply detection and control circuit is used to control the second switch to open when the second power supply signal is abnormal; The second power signal includes a second current through the second resistor and a first terminal voltage of the second resistor; The device further includes: a third power detection and control circuit, a fourth power detection and control circuit, a third switch, and a fourth switch; the third power detection and control circuit is connected in parallel with the first power detection and control circuit; the fourth power detection and control circuit is connected in parallel with the second power detection and control circuit. The third power supply detection and control circuit is used to control the third switch to disconnect when the first power supply signal is abnormal. The fourth power supply detection and control circuit is used to control the fourth switch to disconnect when the second power supply signal is abnormal. The first power supply detection and control circuit includes a first current detection unit and a first voltage detection unit; The first current detection unit is used to detect the first current value passing through the first resistor, and when the first current value is greater than the first current threshold, it controls the first switch to open. The first voltage detection unit is used to detect the input voltage value. If the input voltage value is too high or too low, it controls the first switch to open. The second power supply detection and control circuit includes a second current detection unit and a second voltage detection unit; The second current detection unit is used to detect the second current value passing through the second resistor, and when the second current value is greater than the second current threshold, it controls the second switch to open. The second voltage detection unit is used to detect the input voltage value. If the input voltage value is too high or too low, it controls the second switch to open. The third power supply detection and control circuit includes a third current detection unit and a third voltage detection unit; The third current detection unit is used to detect the first current value passing through the first resistor, and when the first current value is greater than the first current threshold, it controls the third switch to open. The third voltage detection unit is used to detect the input voltage value. If the input voltage value is too high or too low, it controls the third switch to open. The fourth power supply detection and control circuit includes a fourth current detection unit and a fourth voltage detection unit. The fourth current detection unit is used to detect the second current value passing through the second resistor, and when the second current value is greater than the second current threshold, it controls the fourth switch to open. The fourth voltage detection unit is used to detect the input voltage value. If the input voltage value is over-voltage or under-voltage, it controls the fourth switch to open. The second power detection control circuit and the fourth power detection control circuit turn off before or after the first power detection control circuit and the third power detection control circuit, forming a front-stage and back-stage sequential operation architecture.

2. The apparatus according to any one of claims 1, characterized in that, When the first power signal is normal, the first switch and the third switch are closed; When the second power signal is normal, the second switch and the fourth switch are closed.

3. The apparatus according to any one of claims 1, characterized in that, The device also includes: a reverse connection protection circuit; The reverse connection protection circuit includes: a first switching transistor, a second switching transistor, a first capacitor, a second capacitor, a third resistor, a fourth resistor, a fifth resistor, and a third switching transistor; The first terminal of the first switch is connected to the power input terminal, the first terminal of the first capacitor, and the first terminal of the third resistor, respectively. The second terminal of the first switching transistor is connected to the first terminal of the second switching transistor, the second terminal of the first capacitor, the first terminal of the second capacitor, the second terminal of the third resistor, the first terminal of the fourth resistor, and the first terminal of the fifth resistor, respectively. The second terminal of the second switching transistor is connected to the source of the third switching transistor, the second terminal of the second capacitor, the second terminal of the fourth resistor, and the power output terminal, respectively. The second terminal of the fifth resistor is connected to the gate of the third switch; the drain of the third switch is connected to the power input terminal.

4. The apparatus according to claim 3, characterized in that, The third switch is a MOSFET.

5. The apparatus according to claim 3, characterized in that, The first switch is a diode, and the second switch is a Zener diode.

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