Power supply protection circuit and oxygen generator

Abstract

The embodiment of the utility model provides a power supply protection circuit and an oxygenerator, and relates to the technical field of power supply protection, the current signal of an electric device is collected through a switch module, then the current signal of the electric device corresponding to a control module is converted into a first voltage signal through the control module, and when the first voltage signal is abnormal, the first voltage signal is converted into a second voltage signal. The method comprises the following steps: determining that an electric device corresponding to a control module is abnormal, outputting a first control signal at the moment, and then powering off the electric device under the condition that a switch module obtains the first control signal sent by the control module, so that the electric device stops working, thereby effectively preventing the electric device from being powered off when the electric device is powered on and used. And the electric device is damaged due to abnormity of the electric device, so that the risk of damage of the electric device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply protection, in particular to a power supply protection circuit and an oxygen generator. Background Art

[0002] The interior of an electrical device usually includes multiple electrical components. During the process of the electrical device being powered on and used, the electrical components in the electrical device malfunction, resulting in damage to the electrical device.

[0003] For example, the interior of an oxygen generator (electrical device) includes multiple solenoid valves (electrical components). During the process of the oxygen generator being powered on and used, the solenoid valves in the oxygen generator malfunction, resulting in damage to the oxygen generator.

[0004] It should be noted that an oxygen generator is an electrical device that manufactures oxygen with a certain concentration. For example, a molecular sieve oxygen generator mainly uses molecular sieve adsorption and desorption technology, uses an oil-free compressor as the power source, uses molecular sieve as the adsorption medium, and through the cooperation of components such as solenoid valves, separates oxygen and nitrogen in the air, and finally obtains high-concentration oxygen. Summary of the Utility Model

[0005] The utility model provides a power supply protection circuit and an oxygen generator to at least solve the problem in the prior art that the electrical device is damaged due to the malfunction of the electrical components in the electrical device.

[0006] In a first aspect, an embodiment of the utility model provides a power supply protection circuit, including: a switch module and a control module;

[0007] The switch module is electrically connected to the control module. The switch module is used to be electrically connected to the electrical components in the electrical device, collect the current signals of the electrical components, and cut off the power supply of the electrical components when obtaining the first control signal sent by the control module; the control module corresponds to the electrical components;

[0008] The control module is used to convert the current signal of the electrical component corresponding to the control module into a first voltage signal, and output the first control signal when the first voltage signal is abnormal.

[0009] In a second aspect, an embodiment of the utility model provides an oxygen generator, including electrical components, and the electrical components adopt the power supply protection circuit as described in the first aspect.

[0010] In the embodiment of the present utility model, first, a current signal of an electrical component is collected through a switch module, and then the current signal of the electrical component corresponding to the control module is converted into a first voltage signal through the control module. When the first voltage signal is abnormal, it is determined that the electrical component corresponding to the control module is abnormal. At this time, a first control signal is output. Then, when the switch module obtains the first control signal sent by the control module, the electrical component is powered off, so that the electrical component stops working, effectively avoiding damage to the electrical equipment caused by the abnormality of the electrical component during the process of the electrical equipment being powered on and used, and reducing the risk of damage to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0012] Figure 1 is a schematic structural diagram of a power supply protection circuit provided by an embodiment of the present utility model;

[0013] Figure 2 is a schematic structural diagram of another power supply protection circuit provided by an embodiment of the present utility model;

[0014] Figure 3 is a schematic structural diagram of the specific structure of the switch module provided by an embodiment of the present utility model;

[0015] Figure 4 is a schematic structural diagram of a specific structure of the power supply protection circuit provided by an embodiment of the present utility model;

[0016] Figure 5 is a schematic structural diagram of another specific structure of the power supply protection circuit provided by an embodiment of the present utility model;

[0017] Figure 6 is a schematic structural diagram of the specific structure of the first switch sub-module provided by an embodiment of the present utility model;

[0018] Figure 7 is a schematic structural diagram of a specific structure of a second switch sub-module and a sampling resistor provided by an embodiment of the present utility model;

[0019] Figure 8 is a schematic structural diagram of a specific structure of two second switch sub-modules and a sampling resistor provided by an embodiment of the present utility model;

[0020] Figure 9 is a schematic structural diagram of the specific structure of the control module provided by an embodiment of the present utility model;

[0021] Figure 10 It is a schematic structural diagram of the amplification module provided by the embodiment of the present utility model.

[0022] Reference numerals:

[0023] 10 - Switch module; 11 - First switch sub - module; 12 - Second switch sub - module; 13 - Current acquisition sub - module; 20 - Control module; 30 - Electrical equipment; 31 - Electrical component; 40 - Single - chip microcomputer; 50 - First power supply; 60 - Amplification module. Detailed implementation manners

[0024] To make the above - mentioned objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific implementation manners.

[0025] Refer to Figure 1 , the embodiment of the present utility model provides a power supply protection circuit, including: a switch module 10 and a control module 20; the switch module 10 is electrically connected to the control module 20, the switch module 10 is used to be electrically connected to an electrical component 31 in the electrical equipment 30, collect the current signal of the electrical component 31, and cut off the power supply of the electrical component 31 when obtaining the first control signal sent by the control module 20; the control module 20 corresponds to the electrical component 31; the control module 20 is used to convert the current signal of the electrical component 31 corresponding to the control module 20 into a first voltage signal, and output the first control signal when the first voltage signal is abnormal.

[0026] In some embodiments, refer to Figure 4 , the electrical equipment 30 includes one electrical component 31, and the power supply protection circuit includes a switch module 10 and a control module 20; the switch module 10 is electrically connected to the control module 20, the switch module 10 is used to be electrically connected to the electrical component 31 in the electrical equipment 30, collect the current signal of the electrical component 31, and cut off the power supply of the electrical component 31 when obtaining the first control signal sent by the control module 20; the control module 20 is used to convert the current signal of the electrical component 31 into a first voltage signal, and output the first control signal when the first voltage signal is abnormal; the switch module 10 is further used to be electrically connected to the external first power supply 50 and the single - chip microcomputer 40 respectively, and when the second control signal sent by the single - chip microcomputer 40 obtained is at a high level and the first control signal sent by the control module 20 is not obtained, supply power to the electrical component 31 through the first power supply 50; and cut off the power supply of the electrical component 31 when the second control signal is at a low level or at least one first control signal sent by the control module 20 is obtained.

[0027] In other embodiments, refer toFigure 5 The electrical equipment 30 includes a plurality of electrical components 31, and the power supply protection circuit includes a switch module 10 and a plurality of control modules 20; the switch module 10 is electrically connected to each of the control modules 20 respectively, and the switch module 10 is used to be electrically connected to the plurality of electrical components 31 in the electrical equipment 30 respectively, collect the current signals of each of the electrical components 31, and cut off the power supply of each of the electrical components 31 when at least one first control signal sent by the control module 20 is obtained; the control module 20 corresponds to the electrical component 31; the control module 20 is used to convert the current signal of the electrical component 31 corresponding to the control module 20 into a first voltage signal, and output the first control signal when the first voltage signal is abnormal.

[0028] It should be noted that when the switch module 10 obtains the first control signal sent by the control module 20, it indicates that the electrical component 31 corresponding to the control module 20 is abnormal. When at least one of the electrical components 31 is abnormal, that is, when there is an abnormal electrical component 31 among the electrical components 31, the switch module 10 cuts off the power supply of each electrical component 31, so that each electrical component 31 stops working, and further the electrical equipment 30 stops working, so as to avoid damage to the electrical equipment 30 caused by the abnormal electrical component 31. After the staff repairs or replaces the abnormal electrical component 31, the electrical equipment 30 is restarted, ensuring the normal operation of the electrical equipment 30.

[0029] Among them, the abnormality of the electrical component 31 includes short circuit, open circuit, working failure, etc. In some embodiments, the electrical component 31 can be a switch device for controlling the operation of the electrical equipment 30. When each electrical component 31 is powered on and working, the electrical equipment 30 works normally; when each electrical component 31 is powered off and stops working, the electrical equipment 30 stops working; when a partial number of electrical components 31 are powered on and working, and other electrical components 31 are powered off and stop working, the electrical equipment 30 works abnormally and fails.

[0030] Specifically, in some embodiments, the electrical equipment 30 can be an oxygen generator, and the electrical component 31 includes solenoid valves, and the solenoid valves include control valves, pressure equalizing valves, oxygen outlet valves, etc. For example, the electrical equipment 30 can be a molecular sieve oxygen generator, and the molecular sieve oxygen generator internally includes three solenoid valves (i.e., electrical components 31), namely the control valve for periodically pressurizing the compressed air output by the compressor to the molecular sieve, the pressure equalizing valve for connecting two sieve barrels and the oxygen storage tank, and the pulse oxygen outlet valve applied to the pulse oxygen generator. These solenoid valves operate according to the set time sequence, periodically add the high-pressure gas output by the compressor into the molecular sieve, obtain high-concentration oxygen, and deliver it to the user.

[0031] Due to the large number of solenoid valves inside the oxygen generator, it is inevitable that solenoid valve failures occur during the use of the oxygen generator. After a solenoid valve fails, the oxygen generator cannot produce high-concentration oxygen, and in severe cases, it may also cause safety problems such as air path blockage of the oxygen generator, compressor locked rotor, and circuit board burnout.

[0032] The switch module 10 collects the current signals of each solenoid valve, and then the control module 20 converts the current signal of the solenoid valve corresponding to the control module 20 into a first voltage signal. When the first voltage signal is abnormal, it is determined that the solenoid valve corresponding to the control module 20 is abnormal. At this time, a first control signal is output. Then, when the switch module 10 obtains at least one first control signal sent by the control module 20, it cuts off the power supply of each solenoid valve, so that each solenoid valve stops working, reducing the risk of safety problems such as air path blockage of the oxygen generator, compressor locked rotor, and circuit board burnout. After the staff repairs or replaces the abnormal solenoid valve, the oxygen generator is restarted, ensuring the oxygen generation function of the oxygen generator.

[0033] In some embodiments, the control module 20 corresponds to the electrical components 31 one by one; in other embodiments, one control module 20 can correspond to multiple electrical components 31 with equal power.

[0034] In summary, in the embodiments of the present invention, first, the switch module 10 collects the current signals of the electrical components 31, and then the control module 20 converts the current signal of the electrical component 31 corresponding to the control module 20 into a first voltage signal. When the first voltage signal is abnormal, it is determined that the electrical component 31 corresponding to the control module 20 is abnormal. At this time, a first control signal is output. Then, when the switch module 10 obtains the first control signal sent by the control module 20, it cuts off the power supply of the electrical component 31, so that the electrical component 31 stops working, effectively avoiding damage to the electrical equipment 30 caused by the abnormality of the electrical component 31 during the power-on use of the electrical equipment 30, and reducing the risk of damage to the electrical equipment 30.

[0035] Optionally, referring to Figure 2 , in some embodiments, the switch module 10 is also used to be respectively electrically connected to an external first power supply 50 and a single-chip microcomputer 40. When the second control signal sent by the single-chip microcomputer 40 obtained is at a high level and the first control signal sent by the control module 20 is not obtained, the first power supply 50 supplies power to each electrical component 31; and when the second control signal is at a low level, or at least one first control signal sent by the control module 20 is obtained, the power supply of each electrical component 31 is cut off.

[0036] It should be noted that the first power supply 50 is used to supply power to the electrical component 31. For example, the first power supply 50 can be a battery, providing 12V DC power; the single-chip microcomputer 40 is used to control the power-on and power-off of the electrical component 31.

[0037] In the embodiment of the present utility model, when the second control signal sent by the single-chip microcomputer 40 obtained by the switch module 10 is at a high level and the first control signal sent by the control module 20 is not obtained, it is determined that each electrical component 31 is normal, and each electrical component 31 is powered by the first power supply 50, so that the electrical equipment 30 works normally; when the second control signal is at a low level or the first control signal sent by at least one control module 20 is obtained, the switch module 10 determines that the electrical component 31 corresponding to the control module 20 sending the first control signal is abnormal, and cuts off the power of each electrical component 31, so that each electrical component 31 stops working, effectively avoiding damage to the electrical equipment 30 caused by the abnormality of the electrical component 31 during the power-on and use of the electrical equipment 30, and reducing the risk of damage to the electrical equipment 30.

[0038] Optionally, referring to Figure 3 , the switch module 10 includes a first switch sub-module 11, at least one second switch sub-module 12 and at least one current acquisition sub-module 13, and the second switch sub-module 12 corresponds to the electrical component 31 one by one; the number of the control modules 20 is multiple; the first switch sub-module 11 is electrically connected to each of the control modules 20 and each of the second switch sub-modules 12, and the first switch sub-module 11 is used to be electrically connected to the single-chip microcomputer 40 and the first power supply 50. When the second control signal is at a high level and the first control signal sent by the control module 20 is not obtained, each second switch sub-module 12 is powered by the first power supply 50; and when the second control signal is at a low level or the first control signal sent by at least one control module 20 is obtained, the power of each second switch sub-module 12 is cut off.

[0039] The second switch sub-module 12 is electrically connected to the current acquisition sub-module 13. The second switch sub-module 12 is used to be respectively electrically connected to the electrical device 31 corresponding to the second switch sub-module 12 and the single-chip microcomputer 40. When the second switch sub-module 12 is powered on and the third control signal sent by the single-chip microcomputer 40 is obtained, the electrical device 31 corresponding to the second switch sub-module 12 is powered on; and when the second switch sub-module 12 is powered off or the fourth control signal sent by the single-chip microcomputer 40 is obtained, the electrical device 31 corresponding to the second switch sub-module 12 is powered off; the third control signal and the fourth control signal have opposite levels; the current acquisition sub-module 13 is electrically connected to the control module 20, and the current acquisition sub-module 13 is used to acquire the current signal of the electrical device 31 corresponding to the second switch sub-module 12.

[0040] Optionally, the number of the second switch sub-modules 12, the control module 20, and the current acquisition sub-modules 13 corresponds one-to-one to the number of the electrical devices 31.

[0041] Specifically, in some embodiments, the current acquisition sub-module 13 includes a plurality of acquisition resistors R8, and the acquisition resistors R8 correspond to the electrical devices 31; the second switch sub-module 12 is electrically connected to the acquisition resistor R8 corresponding to the second switch sub-module 12, and the acquisition resistor R8 is electrically connected to the control module 20 corresponding to the acquisition resistor R8. The acquisition resistor R8 is used to acquire the current signal of the electrical device 31 corresponding to the second switch sub-module 12.

[0042] In some embodiments, the acquisition resistors R8 correspond one-to-one to the electrical devices 31; in other embodiments, one acquisition resistor R8 can correspond to a plurality of electrical devices 31 with equal power.

[0043] In the embodiment of the present utility model, when the second control signal is at a high level and the first control signal sent by the control module 20 is not obtained, the first switch sub-module 11 determines that each electrical device 31 is normal. The first power supply 50 supplies power to each second switch sub-module 12, and then when the second switch sub-module 12 is powered on and the third control signal sent by the single-chip microcomputer 40 is obtained, the second switch sub-module 12 powers on the electrical device 31 corresponding to the second switch sub-module 12, so as to realize supplying power to each electrical device 31 through the first power supply 50 and enabling the electrical equipment 30 to work normally. At the same time, the current signal of the electrical device 31 corresponding to the second switch sub-module 12 is acquired by the acquisition resistor R8, so that the control module 20 converts the current signal of the electrical device 31 corresponding to the control module 20 into a first voltage signal, and outputs a first control signal when the first voltage signal is abnormal;

[0044] When the second control signal is at a low level or the first control signal sent by at least one control module 20 is obtained through the first switch sub-module 11, it is determined that the electrical component 31 corresponding to the control module 20 sending the first control signal is abnormal, and each second switch sub-module 12 is powered off. Then, through the second switch sub-module 12, when the second switch sub-module 12 is powered off or the fourth control signal sent by the single-chip microcomputer 40 is obtained, the electrical component 31 corresponding to the second switch sub-module 12 is powered off, so as to achieve the stop of each electrical component 31 from working, effectively avoiding the damage of the electrical device 30 caused by the abnormality of the electrical component 31 during the power-on and use of the electrical device 30, and reducing the risk of damage to the electrical device 30.

[0045] Optionally, in some embodiments, the first switch sub-module 11 includes an AND gate chip U1, a first MOS transistor Q1, and a triode N1; the first input terminal A of the AND gate chip U1 is electrically connected to the output terminal of each control module 20, the second input terminal B of the AND gate chip U1 is electrically connected to the first output terminal CTR of the single-chip microcomputer 40, and the output terminal Y of the AND gate chip U1 is electrically connected to the base of the triode N1; the source electrode of the first MOS transistor Q1 is electrically connected to the first power supply 50, the drain electrode 111 of the first MOS transistor Q1 is electrically connected to the power supply terminal of each second switch sub-module 12, and the gate electrode of the first MOS transistor Q1 is electrically connected to the collector of the triode N1; the emitter of the triode N1 is grounded.

[0046] Specifically, referring to Figure 6, in some embodiments, the first switch sub-module 11 includes an AND gate chip U1, a first MOS transistor Q1, a triode N1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; a first input terminal A of the AND gate chip U1 is electrically connected to a first end of the sixth resistor R6, a second input terminal B of the AND gate chip U1 is electrically connected to a first output terminal CTR of the single-chip microcomputer 40, and an output terminal Y of the AND gate chip U1 is electrically connected to a first end of the fourth resistor R4; a source electrode of the first MOS transistor Q1 is electrically connected to the first power supply 50, a drain electrode 111 of the first MOS transistor Q1 is electrically connected to a power supply terminal of each second switch sub-module 12, and a gate electrode of the first MOS transistor Q1 is electrically connected to a first end of the third resistor R3; a collector of the triode N1 is electrically connected to a second end of the third resistor R3, an emitter of the triode N1 is grounded, and a base of the triode N1 is electrically connected to a second end of the fourth resistor R4; a first end of the first resistor R1 is electrically connected to the first output terminal CTR of the single-chip microcomputer 40, and a second end of the first resistor R1 is grounded; a first end of the second resistor R2 is electrically connected to the first power supply 50, and a second end of the second resistor R2 is electrically connected to a first end of the third resistor R3; a first end of the fifth resistor R5 is electrically connected to a second end of the fourth resistor R4, and a second end of the fifth resistor R5 is grounded; a second end of the sixth resistor R6 is electrically connected to an output terminal of each control module 20.

[0047] It should be noted that the first control signal is at a low level; the first switch sub-module 11 further includes a seventh resistor R7, a first capacitor C1, and a second capacitor C2. Among them, a first end of the seventh resistor R7 is electrically connected to an external second power supply, a second end of the seventh resistor R7 is electrically connected to the first input terminal A of the AND gate chip U1, and the seventh resistor R7 is a pull-up resistor; a first end of the first capacitor C1 is electrically connected to the first end of the sixth resistor R6, and the first capacitor C1 and the sixth resistor R6 form a resistor-capacitor (RC) filter; a first end of the second capacitor C2 is electrically connected to a power supply terminal V of the AND gate chip U1, and a second end of the second capacitor C2 is grounded, and the second capacitor C2 is a filter capacitor;

[0048] The first resistor R1 and the fifth resistor R5 are both pull-down resistors, the fourth resistor R4 is an input resistor of the base of the triode N1, and the second resistor R2 and the third resistor R3 are both voltage-dividing resistors;

[0049] The power supply terminal V of the AND gate chip U1 is electrically connected to an external second power supply, and the ground terminal G of the AND gate chip U1 is grounded; when the signal input to the first input terminal A of the AND gate chip U1 is at a high level and the signal input to the second input terminal B of the AND gate chip U1 is at a high level, the signal output from the output terminal Y of the AND gate chip U1 is at a high level; when the signal input to the first input terminal A of the AND gate chip U1 is at a low level or the signal input to the second input terminal B of the AND gate chip U1 is at a low level, the signal output from the output terminal Y of the AND gate chip U1 is at a low level.

[0050] Specifically, the triode N1 is an NPN triode. An NPN-type triode is composed of three semiconductors, including two N (Negative Electrcity) -type semiconductors (electron-type semiconductors) and one P (Positive Electricity) -type semiconductor (hole-type semiconductor). The P-type semiconductor is in the middle, and the two N-type semiconductors are on both sides.

[0051] The first MOS transistor Q1 is a PMOS transistor. A MOS transistor is a Metal - Oxide - Semiconductor Field - Effect Transistor, and a PMOS transistor is a positive channel Metal Oxide Semiconductor; the source electrode of the first MOS transistor Q1 includes a first source electrode terminal, a second source electrode terminal, and a third source electrode terminal; the drain 111 of the first MOS transistor Q1 includes a first drain electrode terminal, a second drain electrode terminal, a third drain electrode terminal, a fourth drain electrode terminal, and a fifth drain electrode terminal; the drain 111 of the first MOS transistor Q1 is also electrically connected to the first test terminal T6.

[0052] In the embodiment of the present utility model, when there is no signal output at the output end of each control module 20, the first input terminal A of the AND gate chip U1 is pulled high by the seventh resistor R7, that is, the signal input to the first input terminal A of the AND gate chip U1 is a high level. Then, when the second control signal output by the first output terminal CTR of the single-chip microcomputer 40 is a high level and there is no signal output at the output end of each control module 20, the signal output by the output terminal Y of the AND gate chip U1 is a high level. At this time, the triode N1 conducts, causing the gate of the first MOS transistor Q1 to be grounded. The gate of the first MOS transistor Q1 is at a low level, and the first MOS transistor Q1 conducts, enabling the first power supply 50 to supply power to the second switch sub-unit; when there is a control module 20 whose output terminal outputs a first control signal among the control modules 20, since the first control signal is a low level, the first input terminal A of the AND gate chip U1 is pulled low, that is, the signal input to the first input terminal A of the AND gate chip U1 is a low level. Then, when the second control signal output by the first output terminal CTR of the single-chip microcomputer 40 is a low level, or when at least one first control signal sent by the control module 20 is obtained, the signal output by the output terminal Y of the AND gate chip U1 is a low level. At this time, the triode N1 is turned off, causing the gate of the first MOS transistor Q1 to be pulled high. The gate of the first MOS transistor Q1 is at a high level, and the first MOS transistor Q1 is turned off, causing the second switch sub-unit to lose power.

[0053] Optionally, in some embodiments, the second switch sub-module 12 includes a second MOS transistor; the current acquisition sub-module 13 includes a plurality of acquisition resistors R8, and the acquisition resistors R8 correspond to the electrical appliances 31; the gate of the second MOS transistor is electrically connected to the second output terminal of the single-chip microcomputer 40, the drain of the second MOS transistor is electrically connected to the negative electrode of the electrical appliance 31 corresponding to the second switch sub-module 12, and the source 121 of the second MOS transistor is electrically connected to the first end of the acquisition resistor R8 corresponding to the second switch sub-module 12; the power output terminal of the first switch sub-module 11 is electrically connected to the positive electrode of the electrical appliance 31 corresponding to the second switch sub-module 12; the first end of the acquisition resistor R8 is electrically connected to the input terminal of the control module 20, and the second end of the acquisition resistor R8 is grounded.

[0054] Specifically, in some embodiments, the second switch sub-module 12 includes a second MOS transistor, a first diode, an eighth resistor, a ninth resistor, a first bead, and a second bead; a second output terminal of the single-chip microcomputer 40 is electrically connected to a first end of the eighth resistor; a gate of the second MOS transistor is electrically connected to a second end of the eighth resistor, a drain of the second MOS transistor is electrically connected to a first end of the second bead, and a source 121 of the second MOS transistor is electrically connected to a first end of a sampling resistor R8 corresponding to the second switch sub-module 12; a positive electrode of the first diode is electrically connected to the first end of the second bead, and a negative electrode of the first diode is electrically connected to a first end of the first bead; the first end of the first bead is electrically connected to a power output terminal of the first switch sub-module 11, and a second end of the first bead is electrically connected to a positive electrode of an electrical component 31 corresponding to the second switch sub-module 12; a second end of the second bead is electrically connected to a negative electrode of the electrical component 31 corresponding to the second switch sub-module 12; a first end of the ninth resistor is electrically connected to the second end of the eighth resistor, and a second end of the ninth resistor is grounded; the first end of the sampling resistor R8 is electrically connected to an input terminal of the control module 20, and a second end of the sampling resistor R8 is grounded.

[0055] It should be noted that the number of second output terminals of the single-chip microcomputer 40 is multiple, and the second output terminals of the single-chip microcomputer 40 correspond to the second MOS transistors one by one; the power output terminal of the first switch sub-module 11 is the drain 111 of the first MOS transistor Q1; the source 121 of the second MOS transistor is the sampling output terminal of the switch module 10 to which the second MOS transistor belongs; the first diode is a freewheeling diode, the first bead and the second bead are used to resist electromagnetic noise interference, the eighth resistor is an input resistor, and the ninth resistor is a pull-down resistor.

[0056] Specifically, in some embodiments, the second MOS transistor is an NMOS transistor, where the NMOS transistor is a Negative channel Metal Oxide Semiconductor, the third control signal is at a high level, and the fourth control signal is at a low level.

[0057] In an embodiment of the present invention, when the second switch sub-module 12 is powered on and the single-chip microcomputer 40 controls the second MOS transistor to conduct, the electrical component 31 is powered on; when the second switch sub-module 12 is powered off or the single-chip microcomputer 40 controls the second MOS transistor to turn off, the electrical component 31 is powered off.

[0058] For example, refer to Figure 7, in some embodiments, the second switch sub-module 12 corresponding to the first electrical component 31 includes a second MOS transistor Q2a, a first diode D1a, an eighth resistor R8a, a ninth resistor R9a, a first bead FB1a, and a second bead FB2a; the second output terminal T1 of the single-chip microcomputer 40 is electrically connected to the first end of the eighth resistor R8a; the gate of the second MOS transistor Q2a is electrically connected to the second end of the eighth resistor R8a, the drain of the second MOS transistor Q2a is electrically connected to the first end of the second bead FB2a, and the source of the second MOS transistor Q2a is electrically connected to the first end of the sampling resistor R8 corresponding to the second switch sub-module 12; the positive electrode of the first diode D1a is electrically connected to the first end of the second bead FB2a, and the negative electrode of the first diode D1a is electrically connected to the first end of the first bead FB1a; the first end of the first bead FB1a is electrically connected to the power output terminal of the first switch sub-module 11, and the second end of the first bead FB1a is electrically connected to the positive electrode of the electrical component 31 corresponding to the second switch sub-module 12; the second end of the second bead FB2a is electrically connected to the negative electrode of the electrical component 31 corresponding to the second switch sub-module 12; the first end of the ninth resistor R9a is electrically connected to the second end of the eighth resistor R8a, and the second end of the ninth resistor R9a is grounded; the first end of the sampling resistor R8 corresponding to the first electrical component 31 is electrically connected to the input terminal of the control module 20, and the second end of the sampling resistor R8 is grounded; wherein, the first electrical component 31 is electrically connected to the second switch sub-module 12 through a connector P1. Specifically, the first end a1 of the connector P1 is respectively electrically connected to the second end of the first bead FB1a and the positive electrode of the first electrical component 31, and the second end a2 of the connector P1 is respectively electrically connected to the second end of the second bead FB2a and the negative electrode of the first electrical component 31.

[0059] Refer to Figure 8, in some other embodiments, the power of the first electrical component 31 is equal to the power of the second electrical component 31. The first second-switch sub-module 12 corresponding to the first electrical component 31 includes a second MOS transistor Q2b, a first diode D1b, an eighth resistor R8b, a ninth resistor R9b, a first bead FB1b, and a second bead FB2b; the second output terminal T2 of the single-chip microcomputer 40 is electrically connected to the first end of the eighth resistor R8b; the gate of the second MOS transistor Q2b is electrically connected to the second end of the eighth resistor R8b, the drain of the second MOS transistor Q2b is electrically connected to the first end of the second bead FB2b, and the source of the second MOS transistor Q2b is electrically connected to the first end of the acquisition resistor R8 corresponding to the first second-switch sub-module 12; the positive electrode of the first diode D1b is electrically connected to the first end of the second bead FB2b, and the negative electrode of the first diode D1b is electrically connected to the first end of the first bead FB1b; the first end of the first bead FB1b is electrically connected to the power output terminal of the first switch sub-module 11, and the second end of the first bead FB1b is electrically connected to the positive electrode of the electrical component 31 corresponding to the first second-switch sub-module 12; the second end of the second bead FB2b is electrically connected to the negative electrode of the electrical component 31 corresponding to the first second-switch sub-module 12; the first end of the ninth resistor R9b is electrically connected to the second end of the eighth resistor R8b, and the second end of the ninth resistor R9b is grounded; the first end of the acquisition resistor R8 corresponding to the first electrical component 31 is electrically connected to the input terminal of the control module 20, and the second end of the acquisition resistor R8 is grounded; wherein, the first electrical component 31 is electrically connected to the first second-switch sub-module 12 through a connector P2. Specifically, the first end b1 of the connector P2 is respectively electrically connected to the second end of the first bead FB1b and the positive electrode of the first electrical component 31, and the second end b2 of the connector P2 is respectively electrically connected to the second end of the second bead FB2b and the negative electrode of the first electrical component 31.

[0060] The second second-switch sub-module 12 corresponding to the second electrical component 31 includes a second MOS transistor Q2c, a first diode D1c, an eighth resistor R8c, a ninth resistor R9c, a first bead FB1c, and a second bead FB2c; the second output terminal T3 of the single-chip microcomputer 40 is electrically connected to the first end of the eighth resistor R8c; the gate of the second MOS transistor Q2c is electrically connected to the second end of the eighth resistor R8c, the drain of the second MOS transistor Q2c is electrically connected to the first end of the second bead FB2c, and the source of the second MOS transistor Q2c is electrically connected to the first end of the acquisition resistor R8 corresponding to the second second-switch sub-module 12; the positive electrode of the first diode D1c is electrically connected to the first end of the second bead FB2c, and the negative electrode of the first diode D1c is electrically connected to the first end of the first bead FB1c; the first end of the first bead FB1c is electrically connected to the power output terminal of the first switch sub-module 11, and the second end of the first bead FB1c is electrically connected to the positive electrode of the electrical component 31 corresponding to the second second-switch sub-module 12; the second end of the second bead FB2c is electrically connected to the negative electrode of the electrical component 31 corresponding to the second second-switch sub-module 12; the first end of the ninth resistor R9c is electrically connected to the second end of the eighth resistor R8c, and the second end of the ninth resistor R9c is grounded; the first end of the acquisition resistor R8 corresponding to the second electrical component 31 is electrically connected to the input terminal of the control module 20, and the second end of the acquisition resistor R8 is grounded; wherein, the second electrical component 31 is electrically connected to the second second-switch sub-module 12 through a connector P2. Specifically, the third terminal b3 of the connector P2 is respectively electrically connected to the second end of the first bead FB1c and the positive electrode of the second electrical component 31, and the fourth terminal b4 of the connector P2 is respectively electrically connected to the second end of the first bead FB2c and the negative electrode of the second electrical component 31.

[0061] In some other embodiments, the second MOS transistor can be replaced by a third MOS transistor. The third MOS transistor is a PMOS transistor. The gate of the third MOS transistor is electrically connected to the second end of the eighth resistor, the source of the third MOS transistor is electrically connected to the first end of the second bead, and the drain of the third MOS transistor is electrically connected to the first end of the acquisition resistor corresponding to the second-switch sub-module; the third control signal is at a low level, and the fourth control signal is at a high level.

[0062] Optionally, in some embodiments, the control module 20 is further configured to be electrically connected to the single-chip microcomputer 40, so that when the single-chip microcomputer 40 obtains the first control signal output by the control module 20, the level of the second control signal is adjusted to a low level.

[0063] In the embodiment of the present invention, when the single-chip microcomputer 40 obtains the first control signal output by the control module 20, the level of the second control signal is adjusted to a low level to cut off the power supply of each electrical component 31.

[0064] Optionally, referring toFigure 9 In some embodiments, the control module 20 includes a first operational amplifier U2, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. An external second power supply is electrically connected to the first end of the tenth resistor R10. The acquisition output end of the switch module 10 is electrically connected to the first end of the twelfth resistor R12. The acquisition output end of the switch module 10 is used to output the current signal of the electrical component 31 corresponding to the control module 20 collected. The non-inverting input end of the first operational amplifier U2 is electrically connected to the second end of the tenth resistor R10. The inverting input end of the first operational amplifier U2 is electrically connected to the second end of the twelfth resistor R12. The output end 201 of the first operational amplifier U2 is respectively electrically connected to the first control end of the switch module 10 and the control input end of the single-chip microcomputer 40. The first end of the eleventh resistor R11 is electrically connected to the second end of the tenth resistor R10, and the second end of the eleventh resistor R11 is grounded.

[0065] It should be noted that the single-chip microcomputer 40 includes multiple control input ends, and the control input ends of the single-chip microcomputer 40 correspond one by one to the control module 20. The first operational amplifier U2 is a comparator. The output end 201 of the first operational amplifier U2 is the output end of the control module 20. The positive electrode of the first operational amplifier U2 is electrically connected to the external second power supply, and the negative electrode of the first operational amplifier U2 is grounded. The control module 20 further includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. Among them, the first end of the third capacitor C3 is electrically connected to the second end of the tenth resistor R10, and the second end of the third capacitor C3 is grounded. The first end of the fourth capacitor C4 is electrically connected to the second end of the twelfth resistor R12, and the second end of the fourth capacitor C4 is grounded. The third capacitor C3 and the fifth capacitor C5 are both used for filtering. The fourth capacitor C4 and the twelfth resistor R12 form a resistor-capacitor filter. The first end of the fifth capacitor C5 is electrically connected to the positive electrode of the first operational amplifier U2, and the second end of the fifth capacitor C5 is grounded. The tenth resistor R10 and the eleventh resistor R11 are both voltage-dividing resistors.

[0066] In the embodiment of the present invention, the voltage value of the first voltage signal is the voltage value across the sampling resistor. The voltage value across the sampling resistor is compared with the reference voltage value through the first operational amplifier U2. When the voltage value across the sampling resistor is greater than the reference voltage value, the output end 201 of the first operational amplifier U2 outputs a low-level signal. When the voltage value across the sampling resistor is less than the reference voltage value, the output end 201 of the first operational amplifier U2 is floating and no signal is output.

[0067] Optionally, in some embodiments, the power supply protection circuit further includes at least one amplification module 60; the switch module 10 is also electrically connected to each of the amplification modules 60, and the switch module 10 is also used to be electrically connected to an external first power supply 50 and a single-chip microcomputer 40 respectively. When the second control signal sent by the single-chip microcomputer 40 obtained is at a high level and the first control signal sent by the control module 20 is not obtained, each electrical component 31 is powered by the first power supply 50; and when the second control signal is at a low level, or at least one first control signal sent by the control module 20 is obtained, each electrical component 31 is powered off; the amplification module 60 corresponds to the electrical component 31; the amplification module 60 is used to be electrically connected to the single-chip microcomputer 40, convert the current signal of the electrical component 31 corresponding to the amplification module 60 into a second voltage signal, and amplify the second voltage signal into a voltage amplification signal for output, so that the single-chip microcomputer 40 adjusts the level of the second control signal according to the voltage amplification signal.

[0068] It should be noted that when the voltage value of the voltage amplification signal is within the preset voltage value range, the single-chip microcomputer 40 sets the level of the second control signal to a high level; when the voltage value of the voltage amplification signal is outside the preset voltage value range, the single-chip microcomputer 40 sets the level of the second control signal to a low level.

[0069] In some embodiments, the amplification module 60 corresponds to the electrical component 31 one by one; in other embodiments, one amplification module 60 can correspond to multiple electrical components 31 with equal power.

[0070] In the embodiment of the present invention, the amplification module 60 converts the current signal of the electrical component 31 corresponding to the amplification module 60 into a second voltage signal, and amplifies the second voltage signal into a voltage amplification signal for output, so that the single-chip microcomputer 40 adjusts the level of the second control signal according to the voltage amplification signal. Then, when the second control signal sent by the single-chip microcomputer 40 obtained by the switch module 10 is at a high level and the first control signal sent by the control module 20 is not obtained, each electrical component 31 is powered by the first power supply 50; and when the second control signal is at a low level, or at least one first control signal sent by the control module 20 is obtained, each electrical component 31 is powered off.

[0071] Optionally, refer to Figure 10, in some embodiments, the amplification module (60) includes a second operational amplifier (U3), the non-inverting input terminal of the second operational amplifier (U3) is connected to the current acquisition sub-module (13) via a thirteenth resistor (R13); the inverting input terminal of the second operational amplifier (U3) is grounded via a fourteenth resistor; the output terminal of the second operational amplifier (U3) is electrically connected to the acquisition input terminal (AD) of the single-chip microcomputer (40).

[0072] Specifically, the amplification module 60 includes a second operational amplifier U3, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor R16; the acquisition output terminal of the switch module 10 is electrically connected to the first end of the thirteenth resistor R13, and the acquisition output terminal of the switch module 10 is used to output the current signal of the electrical component 31 corresponding to the amplification module 60 collected; the non-inverting input terminal of the second operational amplifier U3 is electrically connected to the second end of the thirteenth resistor R13, the inverting input terminal of the second operational amplifier U3 is electrically connected to the first end of the fourteenth resistor R14, and the output terminal of the second operational amplifier U3 is electrically connected to the first end of the sixteenth resistor R16; the second end of the fourteenth resistor R14 is grounded; the first end of the fifteenth resistor R15 is electrically connected to the output terminal of the second operational amplifier U3, and the second end of the fifteenth resistor R15 is electrically connected to the inverting input terminal of the second operational amplifier U3; the second end of the sixteenth resistor R16 is electrically connected to the acquisition input terminal AD of the single-chip microcomputer 40, and the second end of the sixteenth resistor R16 is used to output the voltage amplification signal corresponding to the amplification module 60.

[0073] It should be noted that the single-chip microcomputer 40 includes multiple acquisition input terminals, and the acquisition input terminals are in one-to-one correspondence with the amplification modules 60; the amplification module 60 further includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a second diode D2; the first end of the sixth capacitor C6 is electrically connected to the second end of the thirteenth resistor R13, and the second end of the sixth capacitor C6 is grounded; the first end of the seventh capacitor C7 is electrically connected to the positive electrode of the second operational amplifier U3, and the second end of the seventh capacitor C7 is grounded; the first end of the eighth capacitor C8 is electrically connected to the second end of the sixteenth resistor R16, and the second end of the eighth capacitor C8 is grounded; the negative electrode of the second diode D2 is electrically connected to the output terminal of the second operational amplifier U3, and the positive electrode of the second diode D2 is grounded; the amplification module 60 is a non-inverting proportional operational amplifier, the positive electrode of the second operational amplifier U3 is electrically connected to an external second power supply, and the negative electrode of the second operational amplifier U3 is grounded; the second end of the sixteenth resistor R16 is also electrically connected to a second test terminal T5;

[0074] The thirteenth resistor R13 and the fourteenth resistor R14 are both input resistors, the fifteenth resistor R15 is a feedback resistor, the sixteenth resistor R16 and the eighth capacitor C8 form a resistor-capacitor filter, the thirteenth resistor R13 and the sixth capacitor C6 form a resistor-capacitor filter, the seventh capacitor C7 is a filtering capacitor, and the second diode D2 is a voltage stabilizing diode.

[0075] In the embodiment of the present invention, the voltage value of the second voltage signal, that is, the voltage value of the sampling resistor, is amplified by the second operational amplifier U3 into a voltage amplified signal for output.

[0076] The embodiment of the present invention also provides an oxygen generator, including electrical components, and the electrical components adopt the power supply protection circuit as described above.

[0077] The specific implementation process of the power supply protection circuit in the oxygen generator is similar to the implementation process of the foregoing power supply protection circuit, and will not be elaborated here.

[0078] Optionally, in some embodiments, the electrical components include solenoid valves.

[0079] In the related art, the abnormal state of the solenoid valve in the oxygen generator cannot be recognized. Specifically, the open circuit of the solenoid valve (that is, the internal coil is disconnected) cannot be recognized, resulting in safety problems such as air path blockage, compressor blockage, excessive air path pressure, and damage to air path components in the oxygen generator; the short circuit of the solenoid valve (internal coil short circuit) cannot be recognized, resulting in safety problems such as the oxygen generator being unable to generate high-concentration oxygen and the circuit board being damaged by overcurrent.

[0080] In the embodiment of the present invention, the microcontroller 40 obtains the abnormal state of the solenoid valve in the oxygen generator according to the voltage amplified signal. Specifically, when the voltage value of the voltage amplified signal is less than the first voltage threshold, it is determined that the abnormal state of the solenoid valve corresponding to the voltage amplified signal is an open circuit, and the microcontroller 40 controls the electrical equipment 30 to stop and alarm; when the voltage value of the voltage amplified signal is greater than the second voltage threshold, it is determined that the abnormal state of the solenoid valve corresponding to the voltage amplified signal is a short circuit, and the microcontroller 40 controls the electrical equipment 30 to stop and alarm; wherein, the minimum value in the preset voltage value range is the first voltage threshold, and the maximum value in the preset voltage value range is the second voltage threshold.

[0081] For example, the solenoid valves of the oxygen generator include two 5.5-watt solenoid valves (control valve B1, control valve B2) and one 4-watt solenoid valve (oxygen outlet valve). The sampling resistors corresponding to control valve B1, control valve B2, and the oxygen outlet valve together are 0.3 ohms. During the operation of the oxygen generator, one control valve and one oxygen outlet valve work simultaneously; the sum of the normal operating currents of one control valve and one oxygen outlet valve is in the range of 0.3 A to 0.79 A. After the solenoid valves work normally, the voltage value across the sampling resistor is in the range of 90 mV to 237 mV. The amplification factor of the amplification module 60 is 7.67. The amplification module 60 outputs a voltage amplification signal to the acquisition input end AD of the single-chip microcomputer 40, and the voltage value of the voltage amplification signal is in the range of 0.69 V (obtained by multiplying 90 mV by 7.67) to 1.82 V (obtained by multiplying 237 mV by 7.67); the first voltage threshold is 0.3 V, the second voltage threshold is 2.3 V, and the reference voltage value of the first operational amplifier U2 is 0.67 V.

[0082] The solenoid valves of the oxygen generator further include one 3.2W solenoid valve (equalizing valve). The sampling resistor corresponding to the equalizing valve is 0.8 ohms, and the normal operating current of the equalizing valve is 267 mA. After the solenoid valve works normally, the voltage value across both ends of the sampling resistor is 213 mV. The amplification factor of the amplification module 60 is 7.67. The amplification module 60 outputs a voltage amplification signal to the acquisition input end AD of the single-chip microcomputer 40, and the voltage value of the voltage amplification signal is in the range of 0.69 V (obtained by multiplying 90 mV by 7.67) to 1.82 V (obtained by multiplying 237 mV by 7.67); the first voltage threshold is 0.3 V, the second voltage threshold is 2.3 V; the reference voltage value of the first operational amplifier U2 is 0.628 V.

[0083] In the oxygen generator provided by the embodiment of the present invention, the power supply protection circuit mainly realizes the judgment of the open circuit, short circuit, and working faults of the solenoid valves. It has both the current detection and solenoid valve fault protection functions of the single-chip microcomputer 40 and the hardware overcurrent protection function, realizing double protection of the solenoid valves. The solenoid valve drive adopts closed-loop control, making the oxygen generator safer and more reliable.

[0084] In summary, in the embodiment of the present invention, first, the switch module 10 collects the current signal of the electrical component 31, and then the control module 20 converts the current signal of the electrical component 31 corresponding to the control module 20 into a first voltage signal. When the first voltage signal is abnormal, it is determined that the electrical component 31 corresponding to the control module 20 is abnormal. At this time, a first control signal is output. Then, when the switch module 10 obtains the first control signal sent by the control module 20, it cuts off the power supply of the electrical component 31, making the electrical component 31 stop working, so as to effectively avoid the damage of the electrical equipment 30 caused by the abnormality of the electrical component 31 during the power-on and use of the electrical equipment 30, and reduce the risk of damage to the electrical equipment 30.

[0085] Finally, it should also be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or terminal device.

[0086] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0087] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or replacements, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A power supply protection circuit, characterized in that: include: A switch module (10) and a control module (20); The switch module (10) is electrically connected to the control module (20), and the switch module (10) is used to electrically connect to an electrical device (31) in an electrical device (30), collect a current signal of the electrical device (31), and, when a first control signal sent by the control module (20) is obtained, power off the electrical device (31); the control module (20) corresponds to the electrical device (31); The control module (20) is used to convert a current signal of an electrical device (31) corresponding to the control module (20) into a first voltage signal, and output the first control signal when the first voltage signal is abnormal.

2. The power supply protection circuit according to claim 1, characterized in that: The switch module (10) is also used to be electrically connected to an external first power source (50) and a single-chip microcomputer (40) respectively, and to supply power to the electrical device (31) through the first power source (50) when the second control signal sent by the single-chip microcomputer (40) is at a high level and the first control signal sent by the control module (20) is not obtained; and to cut off power to the electrical device (31) when the second control signal is at a low level or the first control signal sent by at least one of the control modules (20) is obtained.

3. The power supply protection circuit according to claim 2, characterized in that: The switch module (10) comprises a first switch submodule (11), at least one second switch submodule (12) and at least one current collection submodule (13); The first switch submodule (11) is electrically connected to the control module (20) and the second switch submodule (12); the first switch submodule (11) is used to be electrically connected to the single-chip computer (40) and the first power supply (50); when the second control signal is at a high level and the first control signal sent by the control module (20) is not obtained, the second switch submodule (12) is powered by the first power supply (50); and when the second control signal is at a low level or the first control signal sent by the control module (20) is obtained, the second switch submodule (12) is powered off; The second switch submodule (12) is electrically connected to the current acquisition submodule (13); the second switch submodule (12) is used to be electrically connected to the electrical device (31) and the single-chip microcomputer (40); when the second switch submodule (12) is powered on and a third control signal sent by the single-chip microcomputer (40) is obtained, the electrical device (31) is powered on; and when the second switch submodule (12) is powered off or a fourth control signal sent by the single-chip microcomputer (40) is obtained, the electrical device (31) is powered off; the third control signal and the fourth control signal have opposite levels; The current collection submodule (13) is electrically connected to the control module (20), and the current collection submodule (13) is used to collect current signals from the electrical device (31).

4. The power supply protection circuit according to claim 3, characterized in that: The number of the second switch submodules (12), the control modules (20), and the current acquisition submodules (13) corresponds one-to-one to the number of the electrical components (31).

5. The power supply protection circuit according to claim 3 or 4, characterized in that: The first switch submodule (11) comprises an AND gate chip (U1), a first MOS tube (Q1), and a triode (N1); The first input end (A) of the AND gate chip (U1) is electrically connected to the output end of the control module (20), the second input end (B) of the AND gate chip (U1) is electrically connected to the first output end (CTR) of the single-chip computer (40), and the output end (Y) of the AND gate chip (U1) is electrically connected to the base of the transistor (N1); The source of the first MOS transistor (Q1) is electrically connected to the first power source (50), the drain (111) of the first MOS transistor (Q1) is electrically connected to the power supply end of each second switch submodule (12), and the gate of the first MOS transistor (Q1) is electrically connected to the collector of the triode (N1); The emitter of the transistor (N1) is grounded.

6. The power supply protection circuit according to claim 3 or 4, characterized in that: The second switch submodule (12) comprises a second MOS tube; the current collection submodule (13) comprises a collection resistor (R8), The gate of the second MOS tube is electrically connected to the second output end of the single chip computer (40), the drain of the second MOS tube is electrically connected to the negative electrode of the electric device (31) corresponding to the second switch submodule (12), and the source (121) of the second MOS tube is electrically connected to the first end of the collection resistor (R8) corresponding to the second switch submodule (12); The power output end of the first switch submodule (11) is electrically connected to the positive electrode of the electrical device (31) corresponding to the second switch submodule (12); The first end of the acquisition resistor (R8) is electrically connected to the input end of the control module (20), and the second end of the acquisition resistor (R8) is grounded.

7. The power supply protection circuit according to claim 2, characterized in that: The control module (20) is also used to be electrically connected to the single-chip computer (40) so that the single-chip computer (40) adjusts the level of the second control signal to a low level when acquiring the first control signal output by the control module (20).

8. The power supply protection circuit according to claim 7, characterized in that: The control module (20) comprises a first operational amplifier (U2), a tenth resistor (R10), an eleventh resistor (R11), and a twelfth resistor (R12); An external second power source is electrically connected to a first end of the tenth resistor (R10); The collection output end of the switch module (10) is electrically connected to the first end of the twelfth resistor (R12), and the collection output end of the switch module (10) is used to output the collected current signal of the electrical device (31) corresponding to the control module (20); The non-inverting input terminal of the first operational amplifier (U2) is electrically connected to the second end of the tenth resistor (R10); the inverting input terminal of the first operational amplifier (U2) is electrically connected to the second end of the twelfth resistor (R12); and the output terminal (201) of the first operational amplifier (U2) is electrically connected to the first control terminal of the switch module (10) and the control input terminal of the single-chip computer (40), respectively; A first end of the eleventh resistor (R11) is electrically connected to a second end of the tenth resistor (R10), and a second end of the eleventh resistor (R11) is grounded.

9. The power supply protection circuit according to claim 3, characterized in that: The power supply protection circuit further comprises at least one amplification module (60), and the number of the amplification modules corresponds to the number of the electrical devices (31); The amplification module (60) is used to be electrically connected to the single-chip computer (40), convert the current signal of the electrical device (31) corresponding to the amplification module (60) into a second voltage signal, and amplify the second voltage signal into an amplified voltage signal for output, so that the single-chip computer (40) can adjust the level of the second control signal according to the amplified voltage signal.

10. The power supply protection circuit according to claim 9, characterized in that: The amplification module (60) comprises a second operational amplifier (U3); the in-phase input terminal of the second operational amplifier (U3) is connected to the current collection submodule (13) via a thirteenth resistor (R13); the inverting input terminal of the second operational amplifier (U3) is grounded via a fourteenth resistor; and the output terminal of the second operational amplifier (U3) is electrically connected to the collection input terminal (AD) of the single-chip computer (40).

11. An oxygen concentrator, characterized in that: It comprises an electrical device, wherein the electrical device adopts the power supply protection circuit as claimed in any one of claims 1 to 10.

12. The oxygen concentrator according to claim 11, characterized in that: The electrical device includes a solenoid valve.

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