Leakage protection circuit and circuit breaker

Abstract

The utility model provides an electric leakage protection circuit and a circuit breaker, relates to the technical field of circuit breakers, and is used for reducing the possibility that in the prior art, the circuit is low in safety and reliability, and even the circuit cannot be disconnected when electric leakage occurs. The leakage protection circuit comprises an induction unit, a rectification unit, a detection unit and a driving unit. The sensing unit is used for sensing leakage current in a circuit where the circuit breaker is located and outputting an electric leakage signal. The rectification unit is used for receiving the electric leakage signal and rectifying the electric leakage signal so as to output an electric leakage rectification signal. The detection unit is used for receiving the electric leakage rectification signal and determining whether to output a conduction control signal according to the electric leakage rectification signal. And the driving unit is used for receiving the conduction control signal and controlling self conduction according to the conduction control signal. The first end of the driving unit is grounded, the second end of the driving unit is electrically connected with the negative electrode of an electromagnetic release of the circuit breaker, and the positive electrode of the electromagnetic release is electrically connected with the output end of the rectifying unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to a leakage protection circuit and a circuit breaker. BACKGROUND

[0002] With the increasing complexity of the diversity of electronic device loads, especially AC to DC, AC to DC to AC, especially for high-power rectifier products, resulting in an increasing number of pulsating leakage devices.

[0003] The leakage protection circuit in the prior art generally needs an auxiliary power supply, is easily affected by external conditions, has low circuit safety and reliability, and even cannot disconnect the circuit when leakage occurs. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a leakage protection circuit and a circuit breaker for reducing the low circuit safety and reliability in the prior art, and even the possibility of not being able to disconnect the circuit when leakage occurs.

[0005] In a first aspect, the present application provides a leakage protection circuit, comprising an induction unit, a rectification unit, a detection unit and a driving unit. The induction unit is used to induce leakage current in the circuit where the circuit breaker is located and output a leakage signal. The rectification unit is electrically connected with the induction unit, and the rectification unit is used to receive the leakage signal and rectify the leakage signal to output a leakage rectification signal. The input end of the detection unit is electrically connected with the output end of the rectification unit, and the detection unit is used to receive the leakage rectification signal and judge whether to output a conduction control signal according to the leakage rectification signal. The input end of the driving unit is electrically connected with the output end of the detection unit, and the driving unit is used to receive the conduction control signal and control its own conduction according to the conduction control signal. The first end of the driving unit is grounded, and the second end of the driving unit is electrically connected with the negative electrode of the electromagnetic release of the circuit breaker, and the positive electrode of the electromagnetic release is electrically connected with the output end of the rectification unit.

[0006] When the above technical solution is adopted, the induction unit is used to induce leakage current in the circuit where the circuit breaker is located and output a leakage signal. The rectification unit is electrically connected with the induction unit, and the rectification unit is used to receive the leakage signal and rectify the leakage signal to output a leakage rectification signal. The input end of the driving unit is electrically connected with the output end of the detection unit. The driving unit is used to receive the conduction control signal and control its own conduction according to the conduction control signal. The first end of the driving unit is grounded, and the second end of the driving unit is electrically connected with the negative electrode of the electromagnetic release of the circuit breaker, and the positive electrode of the electromagnetic release is electrically connected with the output end of the rectification unit. In this way, when the driving unit receives the conduction control signal and controls its own conduction according to the conduction control signal, the voltage at the first end of the driving unit is equal to the voltage at the second end.

[0007] Since the first end of the driving unit is grounded, and the second end of the driving unit is electrically connected with the negative pole of the electromagnetic tripping device of the circuit breaker, the voltage of the negative pole of the electromagnetic tripping device is equal to the voltage of the first end of the driving unit. That is, the voltage of the negative pole of the electromagnetic tripping device is equal to the voltage of the ground. The voltage of the negative pole of the electromagnetic tripping device is low.

[0008] Since the positive pole of the electromagnetic tripping device is electrically connected with the output end of the rectifying unit, the voltage of the positive pole of the electromagnetic tripping device is equal to the voltage of the output end of the rectifying unit. The voltage of the positive pole of the electromagnetic tripping device is high. The voltage of the positive pole of the electromagnetic tripping device is greater than the voltage of the negative pole of the electromagnetic tripping device.

[0009] In this case, the driving current of the tripping coil of the electromagnetic tripping device can be formed, the coil of the electromagnetic tripping device is turned on, so that the electromagnetic tripping device is opened, and further, the circuit breaker is opened, and the current of the circuit in which the circuit breaker is located is interrupted.

[0010] In this way, on the one hand, no auxiliary power supply is needed in the circuit, and the leakage current induced by the induction unit can drive the tripping device to act, which is not easily affected by the external environment, can improve the safety and reliability of the circuit, and reduce the possibility that the circuit cannot be opened when leakage occurs. On the other hand, the tripping device uses an electromagnetic tripping device, a smaller current can drive the tripping device to open, and there is no high-voltage part in the entire circuit, which improves the safety and reliability of the circuit.

[0011] In a possible implementation, the detection unit has a ground end; the leakage protection circuit further comprises a delay unit, one end of the delay unit is electrically connected with the input end of the detection unit, and the other end of the delay unit is electrically connected with the ground end of the detection unit.

[0012] When the above technical solution is used, the delay unit is provided, which meets the requirement of customers in some special occasions that when there is leakage, only one branch needs to be opened, and the normal work of other devices is not affected.

[0013] In a possible implementation, the delay unit comprises a first capacitor and a first resistor, one end of the first capacitor is electrically connected with the input end of the detection unit, and the other end of the first capacitor is electrically connected with the ground end of the detection unit. The first resistor is connected in parallel with the first capacitor.

[0014] In one possible implementation, the rectifier unit includes a rectifier bridge, which includes a first diode, a second diode, a third diode, and a fourth diode. The cathode of the first diode is electrically connected to the anode of the second diode to form a first connection point, and the first connection point is connected to one end of the sensing unit. The anode of the first diode is electrically connected to the anode of the fourth diode to form a second connection point, and the second connection point is grounded. The cathode of the second diode is electrically connected to the cathode of the third diode to form a third connection point, and the third connection point is the output end of the rectifier unit. The anode of the third diode is electrically connected to the cathode of the fourth diode to form a fourth connection point, and the fourth connection point is electrically connected to the other end of the sensing unit.

[0015] When the above technical solution is adopted, the AC leakage current sensed by the sensing unit can be filtered and rectified into a half-wave leakage current.

[0016] In one possible implementation, the rectifier unit also includes a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, the second capacitor is connected in parallel with the first diode, the third capacitor is connected in parallel with the second diode, the fourth capacitor is connected in parallel with the third diode, and the fifth capacitor is connected in parallel with the fourth diode.

[0017] When the above technical solution is adopted, the second capacitor can filter and rectify the current flowing through the first diode. Similarly, the third capacitor can filter and rectify the current flowing through the second diode. The fourth capacitor can filter and rectify the current flowing through the third diode. The fifth capacitor can filter and rectify the current flowing through the fourth diode, so that the leakage rectification signal output by the rectification unit is smoother.

[0018] In a possible implementation, the rectifying unit further includes a first voltage stabilizer, and two ends of the first voltage stabilizer are electrically connected to two ends of the sensing unit respectively.

[0019] With this technical solution, when the leakage current is excessive and the voltage in the leakage protection circuit exceeds the set value, the first voltage stabilizer automatically turns on, diverting the excess current to the ground wire, thereby preventing circuit overload. The primary function of the first voltage stabilizer is to protect the leakage protection circuit by preventing excessive leakage current from exceeding the voltage load of the leakage protection circuit, thereby protecting other equipment.

[0020] In a possible implementation, the rectifying unit further includes a sixth capacitor, and two ends of the sixth capacitor are electrically connected to two ends of the induction unit respectively.

[0021] When the above technical solution is adopted, the leakage rectification signal output by the rectification unit can be further filtered and rectified, so that the leakage rectification signal output by the rectification unit is smoother, ensuring that the leakage rectification signal is a DC leakage rectification signal.

[0022] In a possible implementation, the driving unit comprises a first transistor and a second transistor. The base of the second transistor is electrically connected to the output of the detecting unit, and the base of the second transistor is also electrically connected to the collector of the first transistor, and the emitter of the second transistor is grounded. The collector of the second transistor is electrically connected to the base of the first transistor, and the emitter of the first transistor is electrically connected to the negative electrode of the electromagnetic release.

[0023] In a possible implementation, the driving unit further comprises a second voltage stabilizer, the anode of the second voltage stabilizer is electrically connected to the emitter of the first transistor, and the cathode of the second voltage stabilizer is electrically connected to the input of the detecting unit.

[0024] When the negative electrode voltage of the electromagnetic release is greater than the positive electrode voltage of the electromagnetic release, the current can be transmitted from the negative electrode of the electromagnetic release to the positive electrode of the electromagnetic release, and then transmitted to the ground through the second voltage stabilizer and the first resistor, so as to ensure the safety of the circuit.

[0025] In a second aspect, the present application provides a circuit breaker, comprising an electromagnetic release and the leakage protection circuit described in the first aspect, the leakage protection circuit is electrically connected to the electromagnetic release, and the leakage protection circuit is used for driving the electromagnetic release to release.

[0026] The beneficial effects of the circuit breaker provided by the embodiments of the present application can refer to the beneficial effects of the leakage protection circuit described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The schematic diagram of the leakage protection circuit provided by the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0029] 1-sensing unit, 2-rectifying unit, 3-detecting unit, 4-driving unit, 5-delay unit, 6-electromagnetic release. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise" and "comprising", "have" and "having", "include" and "including" and any variations thereof are to be construed as referring to compositions and methods comprising, consisting of, consisting essentially of, or consisting of, as appropriate, in accordance with the principles of the application.

[0032] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0033] As shown in Figure 1 The application provides a leakage protection circuit, which comprises an induction unit 1, a rectification unit 2, a detection unit 3 and a driving unit 4.

[0034] The induction unit 1 is configured to induce leakage current in a circuit in which a circuit breaker is located, and output a leakage signal.

[0035] In a specific implementation, the induction unit 1 can comprise a transformer, which is configured to induce leakage current in a circuit in which a circuit breaker is located. When a leakage phenomenon occurs in the circuit, the transformer can induce leakage current, and generate a leakage signal according to the induced leakage current, and output the leakage signal.

[0036] The rectification unit 2 is electrically connected to the induction unit 1, and is configured to receive the leakage signal, and rectify the leakage signal to output a leakage rectification signal.

[0037] In fact, the leakage signal is leakage current, and when the rectification unit 2 is electrically connected to the induction unit 1, the leakage current is transmitted to the rectification unit 2 through the induction unit 1, and the rectification unit 2 rectifies the leakage current.

[0038] In real life, for example, household or industrial devices such as incandescent lamps, electric kettles, etc., generally use alternating current power. When a leakage phenomenon occurs, the induction unit 1 induces alternating current leakage current, and the rectification unit 2 can rectify the alternating current leakage current to form direct current leakage current.

[0039] The input end of the detection unit 3 is electrically connected to the output end of the rectification unit 2, and the detection unit 3 is configured to receive the leakage rectification signal, and determine whether to output a conduction control signal according to the leakage rectification signal.

[0040] It can be understood that since the input end of the detection unit 3 is electrically connected with the output end of the rectifying unit 2, the voltage of the input end of the detection unit 3 is consistent with the voltage of the output end of the rectifying unit 2.

[0041] Specifically, the detection unit 3 can include a voltage detection chip, and the input end 3 pin of the voltage detection chip is electrically connected with the output end of the rectifying unit 2. The voltage threshold value can be stored in the voltage detection chip in advance. The specific value of the voltage threshold value can be determined according to the application environment and user demand. For example, the voltage threshold value can be set to 5V. Of course, this is only an example and is not a specific limitation. As long as the leakage rectification signal is greater than the value when the leakage current is represented, it is within the protection scope of the present application.

[0042] When the detection unit 3 judges that the leakage rectification signal received by the voltage detection chip is less than the voltage threshold value stored in the detection unit 3, the detection unit 3 will not output the conduction control signal. When the detection unit 3 judges that the received leakage rectification signal is greater than the voltage threshold value stored in the detection unit 3, the detection unit 3 will output the conduction control signal.

[0043] The input end of the driving unit 4 is electrically connected with the output end of the detection unit 3, specifically, the input end of the driving unit 4 is electrically connected with the output end 1 pin of the voltage detection chip. The driving unit 4 is used to receive the conduction control signal and control its own conduction according to the conduction control signal. The first end of the driving unit 4 is grounded, and the second end of the driving unit 4 is electrically connected with the negative electrode of the electromagnetic release 6 of the circuit breaker, and the positive electrode of the electromagnetic release 6 is electrically connected with the output end of the rectifying unit 2.

[0044] In this way, when the driving unit 4 receives the conduction control signal and controls its own conduction according to the conduction control signal, the voltage of the first end of the driving unit 4 is equal to the voltage of the second end.

[0045] Since the first end of the driving unit 4 is grounded, and the second end of the driving unit 4 is electrically connected with the negative electrode of the electromagnetic release 6 of the circuit breaker, the voltage of the negative electrode of the electromagnetic release 6 is equal to the voltage of the first end of the driving unit 4. That is, the voltage of the negative electrode of the electromagnetic release 6 is equal to the ground voltage. The voltage of the negative electrode of the electromagnetic release 6 is low.

[0046] And the positive electrode of the electromagnetic release 6 is electrically connected with the output end of the rectifying unit 2, so the voltage of the positive electrode of the electromagnetic release 6 is equal to the voltage of the output end of the rectifying unit 2, and the voltage of the positive electrode of the electromagnetic release 6 is high. The voltage of the positive electrode of the electromagnetic release 6 is greater than the voltage of the negative electrode of the electromagnetic release 6.

[0047] In this case, the release coil driving current of the electromagnetic release 6 can be formed, the coil of the electromagnetic release 6 is turned on, so that the electromagnetic release 6 is disconnected, further, the circuit breaker is disconnected, and the current of the circuit where the circuit breaker is located is disconnected.

[0048] When using the leakage protection circuit provided in the embodiments of the present application, on the one hand, no auxiliary power supply is required in the circuit. The leakage current sensed by the sensing unit 1 can drive the release, making it less susceptible to external environmental influences, thereby improving circuit safety and reliability and reducing the possibility of failure to disconnect the circuit in the event of a leakage. On the other hand, the release uses an electromagnetic release 6, which can be driven to disconnect with a relatively small current. There is no high-voltage component in the entire circuit, thus improving circuit safety and reliability.

[0049] In one possible implementation, see Figure 1 As shown, the detection unit 3 has a ground terminal. The leakage protection circuit provided in the embodiment of the present application also includes a delay unit 5, one end of the delay unit 5 is electrically connected to the input end of the detection unit 3, and the other end of the delay unit 5 is electrically connected to the ground terminal of the detection unit 3.

[0050] Specifically, pin 2 of the voltage detection chip is grounded, one end of the delay unit 5 is electrically connected to pin 3 of the input terminal of the voltage detection chip, and the formed connection point is electrically connected to the output terminal of the rectifier unit 2 .

[0051] The other end of the delay unit 5 is electrically connected to the ground terminal 2 pin of the voltage detection chip, and the formed connection point is connected to the ground.

[0052] The setting of the delay unit 5 meets the customer's requirement in certain special occasions that when there is leakage, only one branch needs to be disconnected and the normal operation of other equipment is not desired to be affected.

[0053] In one example, see Figure 1 As shown, the delay unit 5 provided in the embodiment of the present application includes a first capacitor C2 and a first resistor R3. The first capacitor C2 is a delay capacitor. One end of the first capacitor C2 is electrically connected to the input end of the detection unit 3, and the other end of the first capacitor C2 is electrically connected to the ground end of the detection unit 3. The first resistor R3 is connected in parallel with the first capacitor C2.

[0054] In a specific implementation, two ends of the first capacitor C2 are electrically connected to the input terminal 3 pin and the ground terminal 2 pin of the voltage detection chip respectively, and the first resistor R3 is connected in parallel to the first capacitor C2.

[0055] In actual operation, the tripping time of the electromagnetic release 6 can be adjusted by adjusting the values ​​of the first capacitor C2 and the first resistor R3.

[0056] As a possible implementation, see Figure 1As shown, the rectification unit 2 includes a rectification bridge, which includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The negative electrode of the first diode D1 is electrically connected with the positive electrode of the second diode D2 to form a first connection point, which is connected with one end of the induction unit 1. The positive electrode of the first diode D1 is electrically connected with the positive electrode of the fourth diode D4 to form a second connection point, which is grounded. The negative electrode of the second diode D2 is electrically connected with the negative electrode of the third diode D3 to form a third connection point, which is the output end of the rectification unit 2. The positive electrode of the third diode D3 is electrically connected with the negative electrode of the fourth diode D4 to form a fourth connection point, which is electrically connected with the other end of the induction unit 1.

[0057] In this way, under the action of the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4, the alternating leakage current sensed by the induction unit 1 can be filtered and rectified into a half-wave leakage current.

[0058] Further, referring to Figure 1 The rectification unit 2 provided by the embodiment of the present application further includes a second capacitor C8, a third capacitor C6, a fourth capacitor C3, and a fifth capacitor C4. The second capacitor C8 is connected in parallel with the first diode D1, i.e., the two ends of the second capacitor C8 are respectively connected with the first connection point and the second connection point. The third capacitor C6 is connected in parallel with the second diode D2, i.e., the two ends of the third capacitor C6 are respectively connected with the first connection point and the third connection point. The fourth capacitor C3 is connected in parallel with the third diode D3, i.e., the two ends of the fourth capacitor C3 are respectively connected with the third connection point and the fourth connection point. The fifth capacitor C4 is connected in parallel with the fourth diode D4, i.e., the two ends of the fifth capacitor C4 are respectively connected with the second connection point and the fourth connection point.

[0059] When the above technical solution is adopted, the second capacitor C8 can filter and rectify the current flowing through the first diode D1, and similarly, the third capacitor C6 can filter and rectify the current flowing through the second diode D2, the fourth capacitor C3 can filter and rectify the current flowing through the third diode D3, and the fifth capacitor C4 can filter and rectify the current flowing through the fourth diode D4, so that the leakage rectification signal output by the rectification unit 2 is relatively smooth.

[0060] In some embodiments, as Figure 1 shown, the rectification unit 2 further includes a first voltage stabilizer VD1, and the two ends of the first voltage stabilizer VD1 are respectively electrically connected with the two ends of the induction unit 1.

[0061] In implementation, the first voltage stabilizer VD1 can be a bidirectional diode. When the leakage current is too large and the voltage in the leakage protection circuit exceeds the set value, the first voltage stabilizer VD1 will automatically conduct to introduce the excess current into the ground wire, thereby avoiding the overload of the circuit. The main function of the first voltage stabilizer VD1 is to protect the leakage protection circuit, prevent the leakage current from being too large, and the voltage from exceeding the load of the leakage protection circuit, thereby protecting other devices.

[0062] When the first voltage stabilizer VD1 is a bidirectional diode, the specific model of the bidirectional diode can be BAV99, of course, the actual application is not limited to this, the specific model of the bidirectional diode can be determined according to the application environment and user demand, and the present application does not make specific limitation, all within the protection scope of the present application.

[0063] In an example, the rectification unit 2 further includes a sixth capacitor C7, as shown in Figure 1 The two ends of the sixth capacitor C7 are respectively electrically connected to the two ends of the induction unit 1.

[0064] In this way, the sixth capacitor C7 is arranged to further filter the leakage rectification signal output by the rectification unit 2, so that the leakage rectification signal output by the rectification unit 2 is relatively smooth, and the leakage rectification signal is ensured to be a direct current leakage rectification signal.

[0065] As a feasible way, as shown in Figure 1 The driving unit 4 provided by the embodiment of the present application includes a first triode Q1 and a second triode Q2. The base of the second triode Q2 is electrically connected to the output end of the detection unit 3, the base of the second triode Q2 is also electrically connected to the collector of the first triode Q1, and the emitter of the second triode Q2 is grounded. The collector of the second triode Q2 is electrically connected to the base of the first triode Q1, and the emitter of the first triode Q1 is electrically connected to the negative electrode of the electromagnetic release 6.

[0066] Specifically, the base of the second triode Q2 is electrically connected to the collector of the first triode Q1 to form a fifth connection point. The fifth connection point is electrically connected to the output end 1 pin of the voltage detection chip. The emitter of the second triode Q2 is the first end of the driving unit 4, and the emitter of the first triode Q1 is the second end of the driving unit 4.

[0067] In specific implementations, when leakage occurs in the circuit where the circuit breaker is located, the sensing unit 1 senses the leakage current. After filtering and rectifying by the rectifying unit 2, the rectified leakage current signal is provided to the voltage detection chip. The voltage detection chip compares the rectified leakage current signal with a voltage threshold. When the rectified leakage current signal is greater than the voltage threshold, the voltage detection chip transmits a conduction control signal to the base of the second transistor Q2, thereby electrically conducting the second transistor Q2. The collector of the second transistor Q2 is electrically conductive to the base of the first transistor Q1, thereby electrically conducting the first transistor Q1. The emitter of the second transistor Q2 is grounded, and the emitter of the first transistor Q1 is electrically connected to the negative electrode of the electromagnetic trip device 6. The voltage at the negative electrode of the electromagnetic trip device 6 is low. The voltage at the positive electrode of the electromagnetic trip device 6 is high, and the voltage at the positive electrode of the electromagnetic trip device 6 is greater than the voltage at the negative electrode of the electromagnetic trip device 6. In this case, the coil of the electromagnetic release 6 is turned on and current flows through it, thereby disconnecting the electromagnetic release 6, further disconnecting the circuit breaker and disconnecting the current in the circuit where the circuit breaker is located, thereby achieving leakage protection of the electromagnetic release 6.

[0068] Correspondingly, when the leakage rectification signal is less than the voltage threshold, the first transistor Q1 and the second transistor Q2 are in the disconnected state, and the tripping coil driving current of the electromagnetic release 6 cannot be formed. The electromagnetic release 6 will not be turned on, and the electromagnetic release 6 is in the normally closed state.

[0069] In some embodiments, as Figure 1 As shown, the drive unit 4 further includes a third resistor R6 and a seventh capacitor C5. The ends of the third resistor R6 are electrically connected to the fifth connection point and the emitter of the second transistor Q2, respectively. The seventh capacitor C5 is connected in parallel with the third resistor R6. The seventh capacitor C5 filters and rectifies the current flowing through the second transistor Q2 to ensure smoothness of the current output from the second transistor Q2.

[0070] In other embodiments, the driving unit 4 provided in the embodiments of the present application further includes a second voltage regulator D4, wherein the anode of the second voltage regulator D4 is electrically connected to the emitter of the first transistor Q1, and the cathode of the second voltage regulator D4 is electrically connected to the input terminal of the detection unit 3. Specifically, the cathode of the second voltage regulator D4 is electrically connected to the input terminal 3 pin of the voltage detection chip.

[0071] In this way, when the negative pole voltage of the electromagnetic release 6 is greater than the positive pole voltage of the electromagnetic release 6, the current can be transmitted from the negative pole of the electromagnetic release 6 to the positive pole of the electromagnetic release 6, and transmitted to the ground through the second regulator D4 and the first resistor R3 to ensure the safety of the circuit.

[0072] In addition, a fifth resistor R5 is arranged between the voltage detection chip and the base of the second transistor Q2, and a fourth resistor R4 is arranged between the output end of the rectifying unit 2 and the input end of the voltage detection chip, for reducing the voltage in the circuit.

[0073] In addition to the above, the application further provides a circuit breaker, comprising an electromagnetic tripping device 6 and the above-mentioned leakage protection circuit, the leakage protection circuit being electrically connected with the electromagnetic tripping device 6, and the leakage protection circuit being used for driving the electromagnetic tripping device 6 to trip.

[0074] The beneficial effects of the circuit breaker provided by the embodiments of the application can refer to the beneficial effects of the leakage protection circuit described above, which will not be repeated here.

[0075] The features described in each of the embodiments in the specification can be replaced with each other or combined, and the same or similar parts among the embodiments can be referred to each other, and each of the embodiments mainly describes the difference from other embodiments. Especially, for the system or system embodiments, since they are basically similar to the method embodiments, they are described more simply, and the related parts can refer to the part of the description of the method embodiments. The system and system embodiments described above are only illustrative, wherein the units described as separate components can be or can not be physically separated, and the components shown as units can be or can not be physical units, that is, they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0076] The skilled person can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0077] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0078] It is also to be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Furthermore, the terms "comprising," "containing," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims

1. An electric leakage protection circuit, characterized by comprising: The circuit comprises an induction unit, a rectification unit, a detection unit and a driving unit. The induction unit is configured to induce a leakage current in a circuit where the circuit breaker is located and output a leakage signal. The rectification unit is electrically connected with the induction unit, and is configured to receive the leakage signal and rectify the leakage signal to output a leakage rectification signal. The input end of the detection unit is electrically connected with the output end of the rectification unit, and the detection unit is configured to receive the leakage rectification signal and determine whether to output a conduction control signal according to the leakage rectification signal. The input end of the driving unit is electrically connected with the output end of the detection unit, and the driving unit is configured to receive the conduction control signal and control itself to be turned on according to the conduction control signal.

2. The ground-fault circuit of claim 1, wherein, The first end of the driving unit is grounded, the second end of the driving unit is electrically connected with a negative electrode of an electromagnetic release of the circuit breaker, and a positive electrode of the electromagnetic release is electrically connected with the output end of the rectification unit.

3. The ground-fault circuit of claim 2, wherein, The detection unit has a ground end, and the leakage protection circuit further comprises a delay unit, one end of the delay unit is electrically connected with the input end of the detection unit, and the other end of the delay unit is electrically connected with the ground end of the detection unit. The delay unit comprises: A first capacitor, one end of the first capacitor is electrically connected with the input end of the detection unit, and the other end of the first capacitor is electrically connected with the ground end of the detection unit; 4. The ground-fault circuit of claim 1, wherein, A first resistor, the first resistor is connected in parallel with the first capacitor. The rectification unit comprises a rectification bridge, and the rectification bridge comprises a first diode, a second diode, a third diode and a fourth diode. The negative electrode of the first diode is electrically connected with the positive electrode of the second diode to form a first connection point, and the first connection point is connected with one end of the induction unit. The positive electrode of the first diode is electrically connected with the positive electrode of the fourth diode to form a second connection point, and the second connection point is grounded. The negative electrode of the second diode is electrically connected with the negative electrode of the third diode to form a third connection point, and the third connection point is the output end of the rectification unit.

5. The ground-fault circuit of claim 4, wherein, The positive electrode of the third diode is electrically connected with the negative electrode of the fourth diode to form a fourth connection point, and the fourth connection point is electrically connected with the other end of the induction unit. The rectification unit further comprises a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor. The second capacitor is connected in parallel with the first diode. The third capacitor is connected in parallel with the second diode. The fourth capacitor is connected in parallel with the third diode.

6. The ground-fault circuit of claim 1, wherein, The fifth capacitor is connected in parallel with the fourth diode.

7. The ground-fault circuit of claim 1, wherein, The rectification unit further comprises a first voltage stabilizer, and two ends of the first voltage stabilizer are respectively electrically connected with two ends of the induction unit.

8. The ground fault protection circuit of claim 1, wherein, The rectification unit further comprises a sixth capacitor, and two ends of the sixth capacitor are respectively electrically connected with two ends of the induction unit. The driving unit comprises a first triode and a second triode. The base of the second triode is electrically connected with the output end of the detection unit, and the base of the second triode is also electrically connected with the collector of the first triode; the emitter of the second triode is grounded; the collector of the second triode is electrically connected with the base of the first triode, and the emitter of the first triode is electrically connected with the negative electrode of the electromagnetic tripping device.

9. The ground fault protection circuit of claim 8, wherein, The driving unit further comprises a second stabilizer, the anode of the second stabilizer is electrically connected with the emitter of the first triode, and the cathode of the second stabilizer is electrically connected with the input end of the detection unit.

10. A circuit breaker characterized by, Comprise: An electromagnetic tripping device; The leakage protection circuit according to any one of claims 1 to 9, wherein the leakage protection circuit is electrically connected with the electromagnetic tripping device, and the leakage protection circuit is used for driving the electromagnetic tripping device to trip.

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