Solid state circuit breaker

Abstract

The application provides a solid-state circuit breaker, comprising: a direct current leakage detection unit, a mechanical switch unit, a solid-state switch unit and a control unit; a first end of the direct current leakage detection unit is connected to a positive electrode of a power supply of the solid-state circuit breaker, and a second end of the direct current leakage detection unit is connected to a negative electrode of the power supply of the solid-state circuit breaker; a first end of the mechanical switch unit is connected to a positive input electrode of the power supply, a second end of the mechanical switch unit is connected to a negative input electrode of the power supply, a third end of the mechanical switch unit is connected to a first end of the solid-state switch unit, and a fourth end of the mechanical switch unit is connected to a positive output electrode of the power supply of the solid-state circuit breaker; a third end of the solid-state switch unit is connected to a negative output electrode of the power supply of the solid-state circuit breaker; the direct current leakage detection unit detects whether there is direct current leakage in the solid-state circuit breaker, and the control unit controls on-off of the mechanical switch unit and / or the solid-state switch unit according to a detection result. Thus, the solid-state circuit breaker has a direct current leakage protection function.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and more specifically, to a solid-state circuit breaker. Background Technology

[0002] Direct current (DC) is widely used in many fields due to its stability and controllability. With technological advancements and the development of renewable energy, the application scenarios of DC are constantly expanding and deepening. DC leakage current protection is therefore crucial for the application of DC.

[0003] Existing solid-state circuit breakers can overcome the arcing generated during the breaking process of traditional mechanical circuit breakers, but current solid-state circuit breakers do not have DC leakage current protection. Therefore, how to achieve DC leakage current protection is a problem that needs to be solved. Summary of the Invention

[0004] The purpose of this application is to provide a solid-state circuit breaker that provides DC leakage protection, addressing the shortcomings of the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, embodiments of this application provide a solid-state circuit breaker, the solid-state circuit breaker comprising:

[0007] DC leakage current detection unit, mechanical switch unit, solid-state switch unit, and control unit;

[0008] The first terminal of the DC leakage current detection unit is connected to the positive power supply of the solid-state circuit breaker, the second terminal of the DC leakage current detection unit is connected to the negative power supply of the solid-state circuit breaker, and the third terminal of the DC leakage current detection unit is connected to the control unit.

[0009] The first end of the mechanical switch unit is connected to the positive input of the power supply, the second end of the mechanical switch unit is connected to the negative input of the power supply, the third end of the mechanical switch unit is connected to the first end of the solid-state switch unit, and the fourth end of the mechanical switch unit is connected to the negative output of the power supply of the solid-state circuit breaker.

[0010] The second terminal of the solid-state switch unit is connected to the control unit; the third terminal of the solid-state switch unit is connected to the positive power output terminal of the solid-state circuit breaker.

[0011] The DC leakage current detection unit is used to detect the DC voltage or DC current between the power input terminal and the power output terminal of the solid-state circuit breaker, and send the detection result to the control unit. The control unit is used to control the on / off of the mechanical switch unit and / or the solid-state switch unit according to the detection result.

[0012] Optionally, the mechanical switch unit includes: a first mechanical switch and a second mechanical switch;

[0013] One end of the first mechanical switch is connected to the positive input terminal of the power supply, and the other end of the first mechanical switch is connected to the first end of the solid-state switch unit;

[0014] One end of the second mechanical switch is connected to the negative input terminal of the power supply, and the other end of the second mechanical switch is connected to the negative output terminal of the solid-state circuit breaker.

[0015] Optionally, the solid-state circuit breaker further includes: a measurement unit;

[0016] The first end of the measuring unit is connected to the third end of the mechanical switch unit, the second end of the measuring unit is connected to the positive and negative input terminals of the power supply, the third end of the measuring unit is connected to the first end of the solid-state switch unit, and the fourth end of the measuring unit is connected to the control unit.

[0017] Optionally, the solid-state circuit breaker further includes: a solid-state switch protection unit;

[0018] One end of the solid-state switch protection unit is connected to the first end of the solid-state switch unit;

[0019] The other end of the solid-state switch protection unit is connected to the third end of the solid-state switch unit.

[0020] Optionally, the measuring unit includes: a current measuring unit, a voltage measuring unit, a temperature measuring unit, and a metering unit;

[0021] The first end of the current measuring unit is connected to the third end of the mechanical switch unit, the second end of the current measuring unit is connected to the first end of the solid-state switch unit, the third end of the current measuring unit is connected to the control unit, and the fourth end of the current measuring unit is connected to the first input end of the metering unit.

[0022] The first end of the voltage measuring unit is connected to the positive and negative input terminals of the power supply, and the second end of the voltage measuring unit is connected to the second input terminal of the metering unit.

[0023] The output terminal of the temperature measurement unit is connected to the control unit;

[0024] The output of the metering unit is connected to the control unit.

[0025] Optionally, the current measurement unit includes: a current sensor, a current sampling unit, and a fast current protection unit;

[0026] The first end of the current sensor is connected to the third end of the mechanical switch unit, the second end of the current sensor is connected to the first end of the solid-state switch unit, and the third end of the current sensor is connected to the input end of the current sampling unit.

[0027] The first output terminal of the current sampling unit is connected to one end of the current fast protection unit, and the second output terminal of the current sampling unit is connected to the first input terminal of the metering unit.

[0028] The other end of the current fast protection unit is connected to the control unit.

[0029] Optionally, the DC leakage current detection unit is a fluxgate.

[0030] Optionally, the solid-state circuit breaker further includes: a solid-state switch drive unit;

[0031] One end of the solid-state switch driving unit is connected to the second end of the solid-state switch unit, and the other end of the solid-state switch driving unit is connected to the control unit.

[0032] Optionally, the solid-state circuit breaker further includes: an input surge protection unit and an output surge protection unit;

[0033] One end of the input surge protection unit is connected to the positive input terminal of the power supply, and the other end of the input surge protection unit is connected to the negative input terminal of the power supply.

[0034] One end of the output surge protection unit is connected to the positive output terminal of the power supply, and the other end of the output surge protection unit is connected to the negative output terminal of the power supply.

[0035] Optionally, the solid-state circuit breaker further includes: a housing;

[0036] The DC leakage current detection unit, mechanical switch unit, solid-state switch unit, control unit, and measurement unit are all located on one side of the housing.

[0037] Optionally, the solid-state circuit breaker further includes: a heat dissipation device;

[0038] The heat dissipation device is located on the other side of the housing, and the heat dissipation device is attached to one side of the solid-state switch unit, with the attached surface coated with an insulating thermally conductive sheet.

[0039] The beneficial effects of this application are:

[0040] This application provides a solid-state circuit breaker that adds a DC leakage current detection unit, i.e., a fluxgate, to the existing solid-state circuit breaker. The DC leakage current detection unit is connected in parallel with the solid-state switch unit. The DC leakage current detection unit can detect the DC voltage and DC current in the circuit after the solid-state circuit breaker is powered on, and determine whether there is DC leakage current in the solid-state circuit breaker. This enables the control unit to control the on / off of the mechanical switch unit and / or the solid-state switch unit, so that the solid-state circuit breaker has a DC leakage current protection function. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of a first solid-state circuit breaker provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the structure of a second solid-state circuit breaker provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of a third solid-state circuit breaker provided in an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the structure of the fourth solid-state circuit breaker provided in the embodiments of this application;

[0046] Figure 5 This is a schematic diagram of the structure of the fifth solid-state circuit breaker provided in the embodiments of this application;

[0047] Figure 6 This is a physical schematic diagram of a solid-state circuit breaker provided in an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0049] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0050] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0051] Traditional mechanical circuit breakers are prone to generating electric arcs when cutting off power, which is detrimental to safety. Solid-state circuit breakers, on the other hand, have the advantages of fast switching response, contactless breaking, and long switching life. Therefore, solid-state circuit breakers can overcome the shortcomings of traditional mechanical circuit breakers. With the widespread application of DC power, DC leakage protection is urgently needed, but currently available solid-state circuit breakers do not have DC leakage protection.

[0052] Therefore, this application provides a solid-state circuit breaker that can achieve DC leakage protection function.

[0053] Figure 1 A schematic diagram of the structure of the first solid-state circuit breaker provided in the embodiments of this application is shown below. Figure 1 As shown, the solid-state circuit breaker may include: a DC leakage current detection unit 10, a mechanical switch unit 11, a solid-state switch unit 12, and a control unit 13.

[0054] The DC leakage current detection unit 10 can be a fluxgate magnetometer, a magnetic field measuring element characterized by high precision, high stability, and high sensitivity. A fluxgate magnetometer works by utilizing the saturation effect of a magnetic field on a magnetic core. When the core saturates in an alternating magnetic field, its permeability changes, leading to a change in magnetic flux. These changes in magnetic flux are picked up by an induction coil and converted into an electrical signal, thus enabling the measurement of the magnetic field. Fluxgate magnetometer sensors can be of various types, such as rod-shaped or toroidal magnetic cores. A fluxgate magnetometer sensor typically consists of a magnetic core, an excitation coil, and an induction coil. The magnetic core concentrates the magnetic field, the excitation coil generates an alternating magnetic field to saturate the core, and the induction coil picks up changes in magnetic flux and converts them into an electrical signal.

[0055] Optionally, in this embodiment, a toroidal magnetic core can be selected to detect the current and voltage in the power supply circuit and determine whether there is DC leakage in the solid-state circuit breaker.

[0056] like Figure 1 As shown, the first terminal of the DC leakage current detection unit 10 is connected to the positive terminal of the power supply of the solid-state circuit breaker, the second terminal of the DC leakage current detection unit 10 can be connected to the negative terminal of the power supply of the solid-state circuit breaker, and the third terminal of the DC leakage current detection unit 10 can be connected to the control unit 13. Specifically, the first terminal of the DC leakage current detection unit 10 can be connected to any position between the positive input terminal and the positive output terminal of the power supply of the solid-state circuit breaker, and the second terminal of the DC leakage current detection unit 10 can be connected to any position between the negative input terminal and the negative output terminal of the power supply of the solid-state circuit breaker. Figure 1 The connection method of the DC leakage current detection unit 10 in the example is only one example.

[0057] Specifically, the first end of the DC leakage current detection unit 10 can be connected to the positive power supply of the solid-state circuit breaker through a wire, the second end of the DC leakage current detection unit 10 can be connected to the negative power supply of the solid-state circuit breaker through a wire, and the third end of the DC leakage current detection unit 10 can be connected to the control unit 13 through a wire.

[0058] Continue as Figure 1 As shown, the first end of the mechanical switch unit 11 can be connected to the positive input of the power supply, the second end of the mechanical switch unit 11 can be connected to the negative input of the power supply, the third end of the mechanical switch unit 11 can be connected to the first end of the solid-state switch unit 12, and the fourth end of the mechanical switch unit 11 can be connected to the negative output of the solid-state circuit breaker.

[0059] Continue as Figure 1As shown, the second terminal of the solid-state switch unit 12 can be connected to the control unit 13, and the third terminal of the solid-state switch unit 12 can be connected to the positive power output of the solid-state circuit breaker. Thus, the solid-state switch unit 12 is connected to the positive power output side of the solid-state circuit breaker. Optionally, the positive power output is connected to one end of the load, and the negative power output is connected to the other end of the load. When both the mechanical switch unit 11 and the solid-state switch unit 12 are on, the power supply can provide power to the load connected to the solid-state circuit breaker; when the mechanical switch unit 11 and / or the solid-state switch unit 12 are off, the power supply stops providing power to the load connected to the solid-state circuit breaker.

[0060] Optionally, the solid-state switching unit 12 may include a solid-state switch, also known as a solid-state relay, which is a contactless power-type electronic switch. It controls the flow of current by controlling the conduction of a semiconductor element, such as a silicon crystal or a germanium crystal. The solid-state switching unit 12 can realize the connection or disconnection between the input and output terminals of a solid-state circuit breaker. The semiconductor element can be an N-channel metal-oxide-semiconductor field-effect transistor (NMOS transistor). The first terminal of the solid-state switching unit 12 can be the drain of the NMOS transistor, the second terminal can be the gate of the NMOS transistor, and the third terminal can be the source of the NMOS transistor.

[0061] Specifically, the drain of the nMOS field-effect transistor can be connected to the third terminal of the mechanical switching unit 11, the gate of the nMOS field-effect transistor can be connected to the control unit 13, and the source of the nMOS field-effect transistor can be connected to the positive power output terminal of the solid-state circuit breaker. Thus, the nMOS field-effect transistor is connected to the positive power supply side.

[0062] Optionally, the DC leakage current detection unit 10 can measure the DC current and DC voltage in the circuit breaker circuit and send the detection results to the control unit 13. The control unit 13 can control the on / off state of the mechanical switch unit 11 and / or the solid-state switch unit 12 based on the received detection results. The detection result can refer to whether a result exists in the solid-state circuit breaker, specifically whether DC leakage current exists or not. Specifically, if the DC current exceeds a DC current threshold and / or the DC voltage exceeds a DC voltage threshold, the detection result is that DC leakage current exists; otherwise, it is that DC leakage current does not exist. When the control unit 13 receives a detection result indicating leakage current, it controls the mechanical switch unit 11 and the solid-state switch unit 12 to disconnect. When the control unit 13 receives a detection result indicating no leakage current, it controls the mechanical switch unit 11 and / or the solid-state switch unit 12 to remain on.

[0063] The detection result can also be the detected DC current value and DC voltage value. The control unit determines whether there is DC leakage in the solid-state circuit breaker based on the received DC current and DC voltage values.

[0064] In this embodiment, by adding a DC leakage current detection unit, i.e., a fluxgate, to the current solid-state circuit breaker, and connecting the DC leakage current detection unit in parallel with the solid-state switch unit, the DC voltage and DC current in the circuit after the power is turned on can be detected by the DC leakage current detection unit, and it can be determined whether there is DC leakage current in the solid-state circuit breaker. This enables the control unit to control the on / off of the mechanical switch unit and / or the solid-state switch unit, so that the solid-state circuit breaker has a DC leakage current protection function.

[0065] Figure 2 A schematic diagram of the structure of the second solid-state circuit breaker provided in the embodiments of this application is shown below. Figure 2 As shown, the mechanical switch unit 11 may include a first mechanical switch 110 and a second mechanical switch 111.

[0066] like Figure 2 As shown, one end of the first mechanical switch 110 can be connected to the positive input terminal of the power supply, and the other end of the first mechanical switch is connected to the first terminal of the solid-state switch unit 12. One end of the second mechanical switch 111 can be connected to the negative input terminal of the power supply, and the other end of the second mechanical switch 111 can be connected to the negative output terminal of the solid-state circuit breaker. Thus, the first mechanical switch 110 is connected to the positive side of the power supply, and the second mechanical switch 111 is connected to the negative side of the power supply. When the first mechanical switch 110 and the solid-state switch unit 12 on the positive side of the power supply are turned on, and the second mechanical switch 111 on the negative side of the power supply are turned on, the power supply can supply power to the load connected to the solid-state circuit breaker. When the first mechanical switch 110 and / or the solid-state switch unit 12 on the positive side of the power supply are turned off, and the second mechanical switch 111 on the negative side of the power supply is turned off, the power supply can stop supplying power to the load connected to the solid-state circuit breaker.

[0067] Figure 3 A schematic diagram of the structure of the third solid-state circuit breaker provided in the embodiments of this application is shown below. Figure 3 As shown, the solid-state circuit breaker may also include a measurement unit 14.

[0068] like Figure 3As shown, the first end of the measuring unit 14 can be connected to the third end of the mechanical switch unit 11, the second end of the measuring unit 14 can be connected to the positive and negative input terminals of the power supply, specifically, the second end of the measuring unit 14 can be connected to the positive and negative input terminals of the power supply respectively, the third end of the measuring unit 14 can be connected to the first end of the solid-state switch unit 12, specifically, the third end of the measuring unit 14 can be connected to the drain of the nMOS field-effect transistor through a wire, and the fourth end of the measuring unit 14 can be connected to the control unit 13.

[0069] Optionally, the measuring unit 14 can measure the current, voltage, and temperature data in the circuit breaker circuit and transmit the measured current, voltage, and temperature data to the control unit 13. The control unit 13 can determine whether there are overcurrent, overvoltage, or overtemperature problems in the circuit based on the current, voltage, and temperature data received from the measuring unit 14, so as to realize overcurrent protection, overtemperature protection, and overvoltage protection of the circuit.

[0070] Continue as Figure 3 As shown, the solid-state circuit breaker may also include a solid-state switch protection unit 15. For example... Figure 3 As shown, one end of the solid-state switch protection unit 15 can be connected to the first end of the solid-state switch unit 12, and the other end of the solid-state switch protection unit 15 can be connected to the third end of the solid-state switch unit 12. Specifically, one end of the solid-state switch protection unit 15 can be connected to the drain of the nMOS field-effect transistor via a wire, and the other end of the solid-state switch protection unit 15 can be connected to the source of the nMOS field-effect transistor via a wire.

[0071] Optionally, the control unit 13 can control the solid-state switch protection unit 15 to start or disconnect based on the current data on the circuit of the solid-state switch unit 12 detected by the measurement unit 14. Specifically, when the control unit 13 determines that the current data received from the measurement unit 14 exceeds the current threshold, the solid-state switch protection unit 15 can provide overcurrent protection for the solid-state switch unit 12; when the voltage data measured by the measurement unit 14 exceeds the voltage threshold, the solid-state switch protection unit 15 can provide overvoltage protection for the solid-state switch unit 12; when the temperature data measured by the measurement unit 14 exceeds the temperature threshold, the solid-state switch protection unit 15 can provide overtemperature protection for the solid-state switch unit 12.

[0072] Figure 4 A schematic diagram of the structure of the fourth solid-state circuit breaker provided in the embodiments of this application is shown below. Figure 4 As shown, the measuring unit 14 may include: a current measuring unit 140, a voltage measuring unit 141, a temperature measuring unit 142, and a metering unit 143.

[0073] like Figure 4 As shown, the first end of the current measuring unit 140 can be connected to the third end of the mechanical switch unit 11. Specifically, the first end of the current measuring unit 140 can be connected to the other end of the first mechanical switch 110 via a wire. The second end of the current measuring unit 140 can be connected to the first end of the solid-state switch unit 12. Specifically, the second end of the current measuring unit 140 can be connected to the drain of the nMOS field-effect transistor via a wire. The third end of the current measuring unit 140 can be connected to the control unit 13. The fourth end of the current measuring unit 140 can be connected to the first input end of the metering unit 143. The output end of the metering unit 143 can be connected to the control unit 13. The metering unit 143 can transmit current data and voltage data obtained by analog-to-digital conversion to the control unit 13.

[0074] The current measuring unit 140 can measure the current signal on the circuit where the solid-state switch unit 12 is located, and transmit the measured current signal to the metering unit 143. The metering unit 143 can perform analog-to-digital conversion on the received current signal to obtain the current data corresponding to the current signal, i.e., the current value. Then, the converted current data is transmitted to the control unit 13. The control unit 13 can determine whether the current threshold is exceeded based on the received current data. If it is exceeded, the control unit 13 controls the solid-state switch protection unit 15 to start, so as to realize overcurrent protection for the solid-state switch unit 12.

[0075] Continue as Figure 4 As shown, the first terminal of the voltage measuring unit 141 can be connected to the positive and negative terminals of the power input, and the second terminal of the voltage measuring unit 141 can be connected to the second input terminal of the metering unit 143. The voltage measuring unit 141 can measure the voltage signal at the power input terminal and transmit the measured voltage signal to the metering unit 143. The metering unit 143 can perform analog-to-digital conversion on the received voltage signal to obtain the voltage data corresponding to the voltage signal, i.e., the voltage value. The converted voltage data is then transmitted to the control unit 13. The control unit 13 can determine whether the voltage threshold is exceeded based on the received voltage data. If it is exceeded, the control unit 13 controls the solid-state switch protection unit 15 to activate, providing overvoltage protection for the solid-state switch unit 12.

[0076] Continue as Figure 4 As shown, the output terminal of the temperature measurement unit 142 can be connected to the control unit 13. The temperature measurement unit 142 can measure the temperature data of the circuit and transmit the measured temperature data directly to the control unit 13. The control unit 13 determines whether the received temperature data exceeds the temperature threshold. If it does, the control unit 13 controls the solid-state switch protection unit 15 to start, thereby implementing over-temperature protection for the solid-state switch unit 12.

[0077] Continue as Figure 4 As shown, the aforementioned current measurement unit 140 may include: a current sensor 1401, a current sampling unit 1402, and a current fast protection unit 1403.

[0078] like Figure 4 As shown, the first end of the current sensor 1401 can be connected to the third end of the mechanical switch unit 11. Specifically, the first end of the current sensor 1401 can be connected to the other end of the first mechanical switch 110 in the mechanical switch unit 11 via a wire. The second end of the current sensor 1401 can be connected to the first end of the solid-state switch unit 12. Specifically, the second end of the current sensor 1401 can be connected to the drain of the nMOS field-effect transistor via a wire. The third end of the current sensor 1401 can be connected to the input end of the current sampling unit 1402.

[0079] Continue as Figure 4 As shown, the first output terminal of the current sampling unit 1402 can be connected to one end of the current fast protection unit 1403, and the second output terminal of the current sampling unit 1402 can be connected to the first input terminal of the metering unit 143. The other end of the current fast protection unit 1403 can be connected to the control unit 13. Overcurrent protection for the current sampling unit 1402 and the current sensor 1401 can be achieved through the current fast protection unit 1403.

[0080] Optionally, the current sensor 1401 can collect the current in the circuit where the solid-state switch unit 11 is located, collect the current signal, and transmit the collected current signal to the current sampling unit 1402. The current sampling unit 1402 samples and processes the received current signal to obtain the sampled current signal, and transmits the sampled current signal to the metering unit 143. The metering unit can perform analog-to-digital conversion processing on the sampled current signal to obtain current data, and then transmit the obtained current data to the control unit 13. If the obtained current data exceeds the current threshold, the control unit 13 can also control the current fast protection unit 1403 to start, so as to realize overcurrent protection for the current sampling unit 1402 and the current sensor 1401.

[0081] Figure 5 A schematic diagram of the structure of the fifth solid-state circuit breaker provided in the embodiments of this application is shown below. Figure 5 As shown, the solid-state circuit breaker may also include a solid-state switch drive unit 16.

[0082] like Figure 5As shown, one end of the solid-state switch driving unit 16 can be connected to the second end of the solid-state switch unit 12. Specifically, one end of the solid-state switch driving unit 16 can be connected to the gate of the nMOS field-effect transistor, and the other end of the solid-state switch driving unit 16 can be connected to the control unit 13.

[0083] Optionally, the control unit 13 can send a drive signal to the solid-state switch drive unit 16 based on whether there is a DC leakage current in the circuit detected by the DC leakage current detection unit 10, so that the solid-state switch drive unit 16 can drive the solid-state switch unit 12 to switch on and off based on the drive signal.

[0084] Specifically, if DC leakage current is detected in the circuit by the DC leakage current detection unit 10, the control unit 13 can send a disconnect drive signal to the solid-state switch drive unit 16, which in turn can drive the solid-state switch unit 12 to disconnect. If there is no DC leakage current detected in the circuit by the DC leakage current detection unit 10, the control unit 13 can send a conduction drive signal to the solid-state switch drive unit 16, which in turn can drive the solid-state switch unit 12 to remain on.

[0085] like Figure 5 As shown, the solid-state circuit breaker may also include an input surge protection unit 17 and an output surge protection unit 18.

[0086] like Figure 5 As shown, one end of the input surge protection unit 17 can be connected to the positive input terminal of the power supply, and the other end of the input surge protection unit 17 can be connected to the negative input terminal of the power supply, thus connecting the input surge protection unit to the input terminal of the power supply. The input surge protection unit 17 can be used to clamp and absorb surge voltage, protecting the components on the power input terminal circuit board of the solid-state circuit breaker from voltage surge damage.

[0087] Continue to refer to Figure 5 One end of the output surge protection unit 18 can be connected to the positive output terminal of the power supply, and the other end of the output surge protection unit 18 can be connected to the negative output terminal of the power supply, thus connecting the output surge protection unit to the output terminal of the power supply. The input surge protection unit 17 can be used to clamp and absorb surge voltage, protecting the components on the power output terminal circuit board of the solid-state circuit breaker from voltage surge damage.

[0088] Optionally, the solid-state circuit breaker may also include a housing.

[0089] The DC leakage current detection unit 10, mechanical switch unit 11, solid-state switch unit 12, control unit 13, and measuring unit 14 are all located on one side of the housing. Specifically, the DC leakage current detection unit 10, mechanical switch unit 11, solid-state switch unit 12, control unit 13, and measuring unit 14 can be respectively arranged on the same side of the circuit board, and the circuit board is placed inside the housing. Specifically, as... Figure 6 As shown, Figure 6 This is a physical schematic diagram of a solid-state circuit breaker provided in an embodiment of this application.

[0090] like Figure 6 As shown, the relay is located near the input terminal of the solid-state circuit breaker. Here, the relay refers to the aforementioned mechanical switching unit. The fluxgate is located at the output terminal of the solid-state circuit breaker, meaning the DC leakage current detection unit is located at the output terminal. The power device refers to the aforementioned solid-state switching unit.

[0091] Optionally, the solid-state circuit breaker may also include a heat dissipation device.

[0092] The heat dissipation device is located on the other side of the housing, specifically on the back side of the circuit board housing the DC leakage current detection unit 10, mechanical switch unit 11, solid-state switch unit 12, control unit 13, and measurement unit 14. The heat dissipation device can be attached to one side of the solid-state switch unit, and the contact surface is coated with an insulating thermally conductive sheet. The solid-state switch unit refers to... Figure 5 Power devices in the process.

[0093] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces; the indirect coupling or communication connection of devices or modules can be electrical, mechanical, or other forms.

[0094] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0095] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A solid-state circuit breaker, characterized in that, include: DC leakage current detection unit, mechanical switch unit, solid-state switch unit, and control unit; The first terminal of the DC leakage current detection unit is connected to the positive terminal of the power supply of the solid-state circuit breaker, the second terminal of the DC leakage current detection unit is connected to the negative terminal of the power supply of the solid-state circuit breaker, and the third terminal of the DC leakage current detection unit is connected to the control unit. The first end of the mechanical switch unit is connected to the positive input of the power supply, the second end of the mechanical switch unit is connected to the negative input of the power supply, the third end of the mechanical switch unit is connected to the first end of the solid-state switch unit, and the fourth end of the mechanical switch unit is connected to the negative output of the power supply of the solid-state circuit breaker. The second terminal of the solid-state switch unit is connected to the control unit; the third terminal of the solid-state switch unit is connected to the positive power output terminal of the solid-state circuit breaker. The DC leakage current detection unit is used to detect the DC voltage or DC current between the power input terminal and the power output terminal of the solid-state circuit breaker, and send the detection result to the control unit. The control unit is used to control the on / off of the mechanical switch unit and / or the solid-state switch unit according to the detection result.

2. The solid-state circuit breaker according to claim 1, characterized in that, The mechanical switch unit includes: a first mechanical switch and a second mechanical switch; One end of the first mechanical switch is connected to the positive input terminal of the power supply, and the other end of the first mechanical switch is connected to the first end of the solid-state switch unit; One end of the second mechanical switch is connected to the negative input terminal of the power supply, and the other end of the second mechanical switch is connected to the negative output terminal of the solid-state circuit breaker.

3. The solid-state circuit breaker according to claim 1, characterized in that, The solid-state circuit breaker also includes: a measurement unit; The first end of the measuring unit is connected to the third end of the mechanical switch unit, the second end of the measuring unit is connected to the positive and negative input terminals of the power supply, the third end of the measuring unit is connected to the first end of the solid-state switch unit, and the fourth end of the measuring unit is connected to the control unit.

4. The solid-state circuit breaker according to claim 1, characterized in that, The solid-state circuit breaker also includes: a solid-state switch protection unit; One end of the solid-state switch protection unit is connected to the first end of the solid-state switch unit; The other end of the solid-state switch protection unit is connected to the third end of the solid-state switch unit.

5. The solid-state circuit breaker according to claim 3, characterized in that, The measuring unit includes: a current measuring unit, a voltage measuring unit, a temperature measuring unit, and a metering unit; The first end of the current measuring unit is connected to the third end of the mechanical switch unit, the second end of the current measuring unit is connected to the first end of the solid-state switch unit, the third end of the current measuring unit is connected to the control unit, and the fourth end of the current measuring unit is connected to the first input end of the metering unit. The first end of the voltage measuring unit is connected to the positive and negative input terminals of the power supply, and the second end of the voltage measuring unit is connected to the second input terminal of the metering unit. The output terminal of the temperature measurement unit is connected to the control unit; The output of the metering unit is connected to the control unit.

6. The solid-state circuit breaker according to claim 5, characterized in that, The current measurement unit includes: a current sensor, a current sampling unit, and a fast current protection unit; The first end of the current sensor is connected to the third end of the mechanical switch unit, the second end of the current sensor is connected to the first end of the solid-state switch unit, and the third end of the current sensor is connected to the input end of the current sampling unit. The first output terminal of the current sampling unit is connected to one end of the current fast protection unit, and the second output terminal of the current sampling unit is connected to the first input terminal of the metering unit. The other end of the current fast protection unit is connected to the control unit.

7. The solid-state circuit breaker according to claim 1, characterized in that, The DC leakage current detection unit is a fluxgate.

8. The solid-state circuit breaker according to claim 1, characterized in that, The solid-state circuit breaker also includes: a solid-state switch drive unit; One end of the solid-state switch driving unit is connected to the second end of the solid-state switch unit, and the other end of the solid-state switch driving unit is connected to the control unit.

9. The solid-state circuit breaker according to claim 1, characterized in that, The solid-state circuit breaker also includes: an input surge protection unit and an output surge protection unit; One end of the input surge protection unit is connected to the positive input terminal of the power supply, and the other end of the input surge protection unit is connected to the negative input terminal of the power supply. One end of the output surge protection unit is connected to the positive output terminal of the power supply, and the other end of the output surge protection unit is connected to the negative output terminal of the power supply.

10. The solid-state circuit breaker according to any one of claims 1-9, characterized in that, The solid-state circuit breaker also includes: a housing; The DC leakage current detection unit, mechanical switch unit, solid-state switch unit, control unit, and measurement unit are all located on one side of the housing.

11. The solid-state circuit breaker according to claim 10, characterized in that, The solid-state circuit breaker also includes: a heat dissipation device; The heat dissipation device is located on the other side of the housing, and the heat dissipation device is attached to one side of the solid-state switch unit, with the attached surface coated with an insulating thermally conductive sheet.

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