Current protection device and power supply system

Abstract

The utility model provides a current protection device and a power supply system. The current protection device comprises a main control switch, a current detection unit, a control unit and a first switch unit, and the main control switch comprises a main control contact and a driving coil which are in magnetic fit; the main control contact is used for being connected in series in a to-be-protected main loop, and the driving coil and the first switch unit are connected in series in a driving loop; the current detection unit is electrically connected with the input end of the control unit and is used for detecting the current of the main loop and feeding back a detection signal to the control unit; the output end of the control unit is electrically connected with the first switch unit, and the control unit is used for controlling the on-off state of the first switch unit according to the detection signal so as to control the on-off state of the main loop through the driving loop. According to the invention, through an active protection mode, consumption parts are not needed, continuous work can be carried out in an electrical scene in which current protection needs to be triggered for multiple times, the protection efficiency is improved, and the protection cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical protection, and in particular to a current protection device and a power supply system. BACKGROUND

[0002] In many electrical scenarios, electrical protection needs to be performed on the related circuit, such as current protection. Specifically, in some prior art, a fuse or other consumable is usually connected in series to the circuit to be protected. When the current of the circuit is abnormally large, the fuse or other consumable is passively disconnected, thereby achieving the protection purpose of disconnecting the circuit.

[0003] However, after the implementation of the primary current protection in the prior art, the corresponding consumable needs to be replaced to ensure that the next current protection can be implemented. As can be seen, when dealing with long-term electrical work, the protection efficiency of the prior art is low and the protection cost is high due to the need to trigger multiple current protections. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a current protection device and a power supply system.

[0005] In a first aspect, in one embodiment, the present application provides a current protection device, which comprises a master control switch, a current detection unit, a control unit, and a first switch unit. The master control switch comprises a master control contact and a driving coil in magnetic cooperation.

[0006] The master control contact is used to be connected in series in a main circuit to be protected, and the driving coil and the first switch unit are connected in series in a driving circuit.

[0007] The current detection unit is electrically connected to the input end of the control unit, and is used to detect the current of the main circuit and feed back a detection signal to the control unit.

[0008] The output end of the control unit is electrically connected to the first switch unit, and is used to control the switching state of the first switch unit according to the detection signal, so as to control the on-off state of the main circuit through the driving circuit.

[0009] In one embodiment, the driving circuit is used to access an alternating current power supply, and the first switch unit comprises a bidirectional switch subunit.

[0010] In one embodiment, the bidirectional switch subunit comprises a bidirectional thyristor.

[0011] The first anode and the second anode of the bidirectional thyristor are connected in series with the driving coil, and the gate of the bidirectional thyristor is electrically connected to the output end of the control unit.

[0012] In one embodiment, the bidirectional switch subunit comprises a relay, and the relay comprises a relay coil and a relay contact in magnetic cooperation.

[0013] The relay contact is connected in series with the driving coil, and the relay coil is electrically connected with the output end of the control unit.

[0014] In one embodiment, the current detection unit comprises a current transformer;

[0015] The current transformer is arranged on the power line of the main circuit, and the first end and the second end of the current transformer are electrically connected with the first input end and the second input end of the control unit, respectively.

[0016] In one embodiment, the current protection device further comprises a short-circuit release and a second switch unit;

[0017] The short-circuit release is arranged in series in the main circuit;

[0018] The second switch unit is mechanically connected with the short-circuit release and arranged in series in the driving circuit, and is used to be in an open state based on the tripping action of the short-circuit release when a short circuit occurs in the main circuit, so as to control the on-off state of the main circuit through the driving circuit.

[0019] In one embodiment, the second switch unit comprises a micro switch;

[0020] The micro switch is arranged in series in the driving circuit, and is used to trigger a switching action based on the tripping action of the short-circuit release, so as to switch itself from a closed state to an open state.

[0021] In one embodiment, the second switch unit further comprises an operating mechanism;

[0022] The operating mechanism is mechanically connected with the short-circuit release and the micro switch, respectively, and is used to transmit an operating action with an action degree smaller than the tripping action to the micro switch based on the tripping action of the short-circuit release, so as to trigger the switching action of the micro switch.

[0023] In one embodiment, the second switch unit further comprises a handle;

[0024] The handle is mechanically connected with the operating mechanism, and is used to control the operating mechanism to reset.

[0025] In one embodiment, the second aspect provides a power supply system, which comprises a main power supply, a driving power supply, and the current protection device in any of the above embodiments.

[0026] The main power supply is connected in series with the main circuit, and is used to provide a main power supply signal to the main circuit;

[0027] The driving power supply is connected in series with the driving circuit, and is used to provide a driving power supply signal to the driving circuit.

[0028] By the current protection device and the power supply system, the main control switch is used to control the on-off of the main circuit; since the main control switch comprises the magnetically matched main control contact and the driving coil, the current detection unit, the control unit and the first switch unit are further used to control the on-off of the driving circuit where the driving coil is located, and the on-off of the driving circuit depends on the switch state of the first switch unit, and finally the on-off control of the main circuit is converted into the switch state of the first switch unit; by the active protection mode, no consumables are needed, and the protection efficiency is improved and the protection cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0030] Figure 1 The structural schematic diagram of the current protection device in one embodiment of the present application;

[0031] Figure 2 The structural schematic diagram of the first switch unit comprising the bidirectional thyristor in one embodiment of the present application;

[0032] Figure 3 The structural schematic diagram of the first switch unit comprising the relay in one embodiment of the present application;

[0033] Figure 4 The structural schematic diagram of the current detection unit comprising the current transformer in one embodiment of the present application;

[0034] Figure 5 The structural schematic diagram of the current protection device further comprising the short-circuit release and the second switch unit in one embodiment of the present application;

[0035] Figure 6 The structural schematic diagram of the second switch unit comprising the micro switch in one embodiment of the present application;

[0036] Figure 7 The structural schematic diagram of the second switch unit further comprising the operating mechanism in one embodiment of the present application;

[0037] Figure 8 The structural schematic diagram of the second switch unit further comprising the handle in one embodiment of the present application;

[0038] Figure 9 The mechanical assembly schematic diagram of the current protection device in one embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified. In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person skilled in the art can realize the present application without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid unnecessary details making the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope consistent with the principles and features disclosed.

[0041] In one embodiment, the present application provides a current protection device, which comprises a master control switch K1, a current detection unit, a control unit, and a first switch unit. The master control switch K1 comprises a magnetically cooperating master control contact K11 and a drive coil K12. Figure 1

[0042] The master control contact K11 is used to be connected in series in a main circuit to be protected, and the drive coil K12 and the first switch unit are connected in series in a drive circuit.

[0043] ​The main circuit is connected to the corresponding main power supply through terminals L1 / L2 / L3 and is output to the corresponding power load through terminals T1 / T2 / T3.

[0044] The drive circuit is connected to the corresponding drive power supply through terminals A1 and A2.

[0045] The current detection unit is electrically connected to the input end of the control unit, for detecting the current of the main circuit and feeding back a detection signal to the control unit.

[0046] The output end of the control unit is electrically connected to the first switch unit, for controlling the switching state of the first switch unit according to the detection signal, so as to control the on-off state of the main circuit through the drive circuit.

[0047] It should be noted that, in the Figure 1 , the control unit is also connected in series with the drive circuit to take power from the drive circuit to ensure its own power supply. However, it should be noted that, since the first switch unit is also connected in series with the drive circuit and is used to control the power-on and power-off of the drive coil K12, when the first switch unit is disconnected, the first drive branch in which the drive coil K12 and the first switch unit are located in the drive circuit is disconnected. In order to ensure that the control unit can continue to take power from the drive circuit, the control unit needs to form a second drive branch located in the front stage of the first drive branch with the drive circuit, that is, the switching state of the first switch unit cannot affect the power-on of the control unit.

[0048] The current detection unit is specifically configured to detect the current value of the main circuit and feed back to the control unit in the form of voltage, so as to realize current protection of the main circuit in aspects such as overload and leakage. Specifically, when the main circuit is overloaded or leaks, the current of the main circuit detected by the current detection unit is large, so that the detection signal fed back to the control unit by the current detection unit represents a large current. The control unit controls the first switch unit to be disconnected according to its own processing logic, so that the first drive branch in which the drive coil K12 and the first switch unit are located in the drive circuit is disconnected, the drive coil K12 is powered off and loses the magnetic force, the corresponding main control contact K11 is disconnected, and finally the main circuit is disconnected, realizing current protection.

[0049] Through the above-mentioned current protection device, the main control switch is used to control the on-off of the main circuit. Since the main control switch includes the main control contact and the drive coil matched by magnetic force, the current detection unit, the control unit and the first switch unit are further used to control the on-off of the drive circuit in which the drive coil is located, and the on-off of the drive circuit depends on the switching state of the first switch unit, and finally the on-off control of the main circuit is converted into the switching state of the first switch unit. Through the active protection mode, no consumables are consumed, and the protection efficiency is improved and the protection cost is reduced in the electrical scene that needs to trigger multiple current protections.

[0050] In one embodiment, the driving circuit is used to access an alternating current power supply, and the first switch unit comprises a bidirectional switch subunit.

[0051] When the driving circuit is used to access an alternating current power supply, it is necessary for the first switch unit connected in series with the driving circuit to work in an alternating current environment and to control the on-off of the alternating current circuit. Taking semiconductor switches as an example, some semiconductor switches have polarity, and most single switch devices are usually used to work in a direct current environment and to control the on-off of a direct current circuit, such as MOS tubes and triodes.

[0052] Therefore, in the present embodiment, it is necessary to use a bidirectional switch subunit with bidirectional switch capability to ensure reliable on-off control of the driving circuit used to access an alternating current power supply.

[0053] As shown in FIG. 1, Figure 2 In one embodiment, the bidirectional switch subunit comprises a bidirectional thyristor D1.

[0054] The first anode S1 and the second anode S2 of the bidirectional thyristor D1 are connected in series with the driving coil K12, and the gate G of the bidirectional thyristor D1 is electrically connected with the output end of the control unit.

[0055] The bidirectional thyristor forms an automatic regulating loop through internal transistors and MOS transistors, can switch states in different loops, and realizes bidirectional control.

[0056] As shown in FIG. 2, Figure 3 In one embodiment, the bidirectional switch subunit comprises a relay K2, and the relay K2 comprises a magnetically matched relay coil K22 and a relay contact K21.

[0057] The relay contact K21 is connected in series with the driving coil K12, and the relay coil K22 is electrically connected with the output end of the control unit.

[0058] Since the relay contact K21 has no polarity, it can be used to control the on-off of the alternating current circuit. When the relay contact K21 is disconnected, neither positive current nor negative current can pass through, and vice versa, when the relay contact K21 is connected, both positive current and negative current can pass through.

[0059] When the relay coil K22 has current, it can generate magnetic force to disconnect the relay contact K21. The two ends of the relay coil K22 are electrically connected with the control unit, and at this time, the control unit needs to provide a corresponding current loop for the relay coil K22 and provide a pressure difference between the two ends of the relay coil K22 to form current.

[0060] The relay K2 can be an intermediate relay, which is mainly used in higher voltage or larger current scenarios, can realize larger conduction current and higher working frequency, and can be more suitable for the AC power source connected to the drive circuit.

[0061] In addition, the control unit can be an integrated control board including a core such as an MCU, or a collection of distributed devices including a core such as an MCU.

[0062] It should be noted that in the above embodiment, the drive circuit is used to connect to the AC power source, and the core such as the MCU needs to work in a low-voltage DC environment, so the control unit includes a corresponding power supply processing circuit, which can process the connected AC power source to output corresponding DC power to the core such as the MCU.

[0063] Reference Figures 1 to 3 Regardless of the specific device used by the first switch unit, the purpose is to control the on-off of the first drive branch in which the drive coil K12 is located in the drive circuit, and the first drive branch needs to form a loop through terminals A1 and A2, so in other embodiments, the drive coil K12 can also be connected in series between terminal A2 and the first switch unit; However, it should be noted that the power-on and power-off of the drive coil K12 cannot affect the power-on of the control unit, so when the drive coil K12 is connected in series between terminal A2 and the first switch unit, the second drive branch in which the control unit is located still needs to be located in the front stage of the drive coil K12.

[0064] As Figure 4 shown, in one embodiment, the current detection unit includes a current transformer L1.

[0065] The current transformer L1 is used to be sleeved on the power line of the main circuit, and the first end and the second end of the current transformer L1 are electrically connected with the first input end and the second input end of the control unit, respectively.

[0066] The current transformer (CT) L1 is a device used to measure alternating current, and its working principle is based on electromagnetic induction. The main function of the current transformer L1 is to convert the high current in the main circuit into a smaller and easy-to-measure current, so as to facilitate the use of the control unit.

[0067] The current transformer L1 usually outputs an analog quantity of current, so the control unit needs to include a corresponding signal conditioning circuit (such as a sampling resistor and an operational amplifier) to convert the analog quantity of current output by the current transformer L1 into a digital quantity of voltage, so that the core such as the MCU can process it.

[0068] As Figure 5As shown, in one embodiment, the current protection device further comprises a short-circuit tripping device K3 and a second switch unit.

[0069] The short-circuit tripping device K3 is used to be connected in series in the main circuit.

[0070] The short-circuit tripping device K3 is capable of performing a tripping action when a short circuit occurs in the main circuit.

[0071] The second switch unit is mechanically connected with the short-circuit tripping device K3 and is used to be connected in series in the driving circuit, and is used to be in an open state based on the tripping action of the short-circuit tripping device K3 when a short circuit occurs in the main circuit, so as to control the on-off state of the main circuit through the driving circuit.

[0072] As mentioned in the above embodiments, the current protection of the main circuit can be realized by the current detection unit, the first switch unit and the control unit. Since the whole process involves multiple operations such as detection, feedback, judgment and execution, a relatively long time is required, which is mainly used for long-delay current protection in overload and leakage. However, short-circuit protection usually needs to be completed in a relatively short time, which belongs to instantaneous protection. When a short circuit occurs in the main circuit, the processing time required by the current detection unit, the first switch unit and the control unit is difficult to meet the requirements, and if these units are still used for realization, the reliability of short-circuit protection will be low.

[0073] Specifically, short-circuit fault usually causes a sharp rise in current, so a quick response is required. Short-circuit protection can act within milliseconds to quickly cut off the power supply. Overload is usually caused by current exceeding the rated value but not causing damage immediately. Long-delay protection allows short-time overload (such as starting current), but will act when there is continuous overload. For leakage protection, it will act when current imbalance is detected. Long-delay setting allows short-time current imbalance (such as transient state when the device starts), but will cut off the power supply when there is continuous leakage.

[0074] Therefore, in the present embodiment, the short-circuit tripping device K3 and the second switch unit are additionally provided. When a short circuit occurs in the main circuit, the short-circuit tripping device K3 immediately performs a tripping action, thereby triggering the second switch unit to be in an open state, and then quickly disconnecting the main circuit by opening the driving circuit, thereby ensuring the reliability of short-circuit protection.

[0075] As shown in one embodiment, the second switch unit comprises a micro switch. Figure 6

[0076] ​It needs to be added that, since the driving power supply connected by the driving circuit is usually processed by the main power supply connected by the main circuit, and the short circuit fault is harmful to the circuit, when the main circuit appears short circuit, the power supply of the control unit can be cut off at the same time. Therefore, in the embodiment, the second switch unit can be connected in series in the driving circuit and located in the front stage of the control unit. When the second switch unit is disconnected, the first driving branch where the driving coil K12 is located and the second driving branch where the control unit is located are disconnected at the same time, thereby improving the effect of short circuit protection.

[0077] The micro switch is used to be connected in series in the driving circuit, and is used to trigger the switching action based on the tripping action of the short circuit tripper K3, so as to switch itself from the closed state to the open state.

[0078] When the main circuit does not appear short circuit, the micro switch is in the closed state, and the short circuit tripper K3 will not perform the corresponding tripping action, which makes the micro switch also not trigger the corresponding switching action, thereby keeping the closed state. On the contrary, when the main circuit appears short circuit, the short circuit tripper K3 will perform the corresponding tripping action, which makes the micro switch also trigger the corresponding switching action, thereby switching the closed state to the open state.

[0079] The micro switch is a kind of mechanical switch, which is named because of its small contact spacing and rapid action, and it is usually used in application occasions requiring rapid switching. Since the speed required by the short circuit protection itself is relatively fast, the use of the micro switch as the execution device for disconnecting the driving circuit can further improve the reliability of the short circuit protection.

[0080] As shown in FIG. 1, Figure 7 In an embodiment, the second switch unit further includes an operating mechanism.

[0081] The operating mechanism is mechanically connected with the short circuit tripper K3 and the micro switch respectively, and is used to transmit an operating action with a smaller action degree to the micro switch based on the tripping action of the short circuit tripper K3, so as to trigger the switching action of the micro switch.

[0082] As mentioned in the above embodiment, the core of the rapid action of the micro switch lies in that the action degree is small, and the tripping action performed by the short circuit tripper K3 has a larger action degree. If the tripping action is directly transmitted to the micro switch, the micro switch is easy to be damaged. Therefore, the operating mechanism is added in the embodiment, which is used to realize the action transmission between the short circuit tripper K3 and the micro switch, so as to realize the short circuit protection and protect the micro switch from being damaged.

[0083] As shown in FIG. 1, Figure 8 In an embodiment, the second switch unit further includes a handle.

[0084] The handle is mechanically connected with the operating mechanism for controlling the operating mechanism to reset.

[0085] The operating mechanism is used to realize action transmission, and can have a reset function by itself, for example, when the short-circuit release K3 is re-closed, the operating mechanism can be automatically reset to facilitate the action transmission of the next tripping action. If the operating mechanism does not have a reset function by itself, the handle can be used to manually reset the operating mechanism, or the handle can be used to manually reset the operating mechanism when the automatic reset function of the operating mechanism fails.

[0086] As shown in Figure 9 In one embodiment, the master switch K1 further includes a static iron core K13 and a moving iron core K14 of a driving coil K12, and a push rod K15 for driving the master contact K11 to act. The short-circuit release K3 is mechanically connected with the master contact K11 through the cross bar 201 and the elastic member 202 in addition to being mechanically connected with the micro switch 101 through the operating mechanism 102.

[0087] When a short circuit occurs in the main circuit, the short-circuit release K3 will perform a tripping action regardless of the magnitude of the short-circuit current, so as to transmit the action to the operating mechanism 102 through the shaft inside the short-circuit release K3, so that the operating mechanism 102 transmits the action to the micro switch 101, so that the micro switch 101 triggers a switching action to switch from a closed state to an open state, and then the driving coil K12 is powered off, and the master contact K11 is opened by the action of the push rod K15, thereby realizing the first aspect of short-circuit protection. In addition, when a short circuit occurs in the main circuit and the short-circuit current is large, the shaft inside the short-circuit release K3 obtains a large kinetic energy, and the spring surrounding the shaft obtains a large elastic energy, which eventually breaks through the displacement limit of the shaft, so that the spring drives the shaft to fall back, thereby rotating the cross bar 201, and then compressing the elastic member 202, and finally opening the master contact K11, thereby realizing the second aspect of short-circuit protection.

[0088] In summary, the current protection device provided by the application can disconnect the driving circuit by controlling the bidirectional thyristor or the relay when an overload, leakage or other non-short-circuit fault occurs, so as to disconnect the master switch. When a short-circuit fault occurs, the driving circuit can be disconnected by the short-circuit release, the operating mechanism and the micro switch, so as to disconnect the master switch. When a short-circuit fault occurs and the short-circuit current is large, the master switch can be directly disconnected by the short-circuit release, the cross bar and the elastic member.

[0089] In the second aspect, in one embodiment, the application provides a power supply system, which includes a main power supply, a driving power supply and the current protection device in any of the above embodiments.

[0090] The main power source is connected in series with the main circuit to provide a main power supply signal to the main circuit; and the drive power source is connected in series with the drive circuit to provide a drive power supply signal to the drive circuit.

[0091] By the current protection device included in the power supply system, the main control switch is used to control the on-off of the main circuit; since the main control switch includes the magnetically matched main control contact and the drive coil, the current detection unit, the control unit and the first switch unit are further used to control the on-off of the drive circuit where the drive coil is located, and the on-off of the drive circuit depends on the switch state of the first switch unit, and finally the on-off control of the main circuit is converted into the switch state of the first switch unit; by the active protection mode, no consumables are needed, and the protection efficiency is improved and the protection cost is reduced.

[0092] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be repeated here.

[0093] The current protection device and the power supply system provided by the application are described in detail above, and the principles and implementation manners of the application are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the method of the application and its core idea; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation manner and application range will be changed, and the above description should not be understood as the limitation of the application.

[0094] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

Claims

1. A current protection device, characterized by, The current protection device comprises a master switch, a current detection unit, a control unit, and a first switch unit. The master switch comprises a magnetically matched master contact and a drive coil. The master contact is used to be connected in series in a main circuit to be protected, and the drive coil and the first switch unit are connected in series in a drive circuit. The current detection unit is electrically connected with an input end of the control unit, used to detect the current of the main circuit and feed back a detection signal to the control unit. An output end of the control unit is electrically connected with the first switch unit, used to control the switching state of the first switch unit according to the detection signal, so as to control the on-off state of the main circuit through the drive circuit.

2. The current protection device of claim 1, wherein, The drive circuit is used to access an alternating current power supply, and the first switch unit comprises a bidirectional switch subunit.

3. The current protection device of claim 2, wherein, The bidirectional switch subunit comprises a bidirectional thyristor. First and second anodes of the bidirectional thyristor are connected in series with the drive coil, and a gate of the bidirectional thyristor is electrically connected with an output end of the control unit.

4. The current protection device of claim 2, wherein, The bidirectional switch subunit comprises a relay, and the relay comprises a magnetically matched relay coil and a relay contact. The relay contact is connected in series with the drive coil, and the relay coil is electrically connected with an output end of the control unit.

5. The current protection device of claim 1, wherein, The current detection unit comprises a current transformer. The current transformer is used to be sleeved on a power line of the main circuit, and first and second ends of the current transformer are respectively electrically connected with first and second input ends of the control unit.

6. The current protection device according to any one of claims 1 to 5, characterized in that The current protection device further comprises a short-circuit release and a second switch unit. The short-circuit release is used to be connected in series in the main circuit. The second switch unit is mechanically connected with the short-circuit release and is used to be connected in series in the drive circuit, used to be in an open state based on a tripping action of the short-circuit release when a short circuit occurs in the main circuit, so as to control the on-off state of the main circuit through the drive circuit.

7. The current protection device of claim 6, wherein, The second switch unit comprises a micro switch. The micro switch is used to be connected in series in the drive circuit, used to trigger a switching action based on the tripping action of the short-circuit release, so as to switch itself from a closed state to an open state.

8. The current protection device of claim 7, wherein, The second switch unit further comprises an operating mechanism. The operating mechanism is mechanically connected with the short-circuit release and the micro switch respectively, used to transmit an operating action with a degree of action smaller than the tripping action of the short-circuit release to the micro switch based on the tripping action of the short-circuit release, so as to trigger the switching action of the micro switch.

9. The current protection device of claim 8, wherein, The second switch unit further comprises a handle. The handle is mechanically connected with the operating mechanism, used to control the operating mechanism to reset.

10. A power supply system characterized by comprising: The power supply system comprises a main power supply, a drive power supply, and the current protection device according to any one of claims 1 to 9. The main power supply is connected in series with the main circuit, used to provide a main power supply signal to the main circuit. The drive power supply is connected in series with the drive circuit, used to provide a drive power supply signal to the drive circuit.

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