An F-type residual current detection and protection device

Abstract

The present invention discloses an F-type residual current detection and protection device, which relates to the technical field of current detection devices, and includes a drive circuit, a power supply circuit, and a residual current sampling circuit for sampling the residual current in the line through a mutual inductor, respectively connected to a line, the power supply circuit is respectively connected to the drive circuit and a signal processing and control circuit, the residual current sampling circuit transmits the current information detected by the mutual inductor to the signal processing and control circuit, and the signal processing and control circuit controls the drive circuit according to the received residual current signal. This device can not only target traditional AC type leakage accidents, but also can reliably and effectively identify, warn, or directly perform protection output and cut off power supply for new pulsating direct current brought by rectification or frequency conversion technology, or high-frequency alternating current, or high-low frequency mixed alternating current signals, or instantaneous large currents.

Description

Technical Field

[0001] The invention relates to the technical field of current detection devices, in particular to an F-type residual current detection and protection device. Background Art

[0002] The vast majority of residual current protection products currently used in production and life are of AC type, accounting for more than 95%, and less than 5% are of A type.

[0003] AC residual current protection products can only provide effective protection for AC leakage accidents, that is, they only detect the leakage current of the sinusoidal AC waveform, determine the threshold, and perform protection output actions, such as directly cutting off the power supply. Or send out an early warning signal to notify the upper-level monitoring system of the leakage accident, and the upper-level system will decide whether to cut off the power supply for protection after systematic analysis.

[0004] However, with the improvement of people's production and living standards, more and more new electrical products and occasions are constantly being innovated, especially the new green environmental protection concept vigorously advocated by the country in today's society is becoming more and more deeply rooted in people's lives and production activities. In order to save energy and protect the environment, more and more new products adopt new rectification and frequency conversion technologies.

[0005] While these new technologies bring green energy-saving indicators, they also bring another side, that is, when these electronic products are internally short-circuited, the strong electricity introduced from the power plug is introduced into the weak electricity part at the back end. This makes the originally safe products unsafe. When a leakage accident occurs, the leakage current will no longer be the AC type at the AC power supply end, but the pulsating DC or high-frequency AC type A signal after rectification or frequency conversion. At this time, the traditional AC type leakage protection product cannot reliably and effectively protect the new type A leakage accident. So the new type A product appeared, which can protect the pulsating DC signal generated by the rectification technology. However, it is impossible to effectively identify and protect the high-frequency signal or high-low frequency mixed AC signal generated by the frequency conversion technology.

[0006] At the same time, many new loads will generate a huge leakage current at the moment of startup. Although it is only a very short time of microseconds or milliseconds, traditional AC or newer A-type leakage protection products cannot accurately identify it, resulting in unnecessary false power outages, which brings great inconvenience to people's normal production and life.

[0007] Therefore, a technology is urgently needed to solve the above problems. Summary of the invention

[0008] In view of the deficiencies in the prior art, the present invention proposes an F-type residual current detection and protection device, which can not only detect traditional AC leakage accidents, but also reliably and effectively identify, warn, or directly perform protection output and cut off power supply for new pulsating DC brought by rectification or frequency conversion technology, or high-frequency AC, or high-and-low-frequency mixed AC signals, or instantaneous large currents.

[0009] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0010] An F-type residual current detection and protection device comprises a drive circuit 2, a power supply circuit 3, and a residual current sampling circuit 6 for sampling the residual current in the line 1 through a mutual inductor 5, respectively connected to a line 1. The power supply circuit 3 is respectively connected to the drive circuit 2 and a signal processing and control circuit 4. The residual current sampling circuit 6 transmits the current information detected by the mutual inductor 5 to the signal processing and control circuit 4. The signal processing and control circuit 4 controls the drive circuit 2 according to the received residual current signal.

[0011] Preferably, the line 1 is a single-phase line or a three-phase line, and the three-phase line includes an L1 line, an L2 line, an L3 line and an N line;

[0012] The driving circuit 2 includes a switch circuit 21 connected to the circuit 1 and a trigger circuit 22 for controlling the switch circuit 21;

[0013] The power supply circuit 3 includes a step-down circuit 31 for stepping down the current in the circuit 1, and a rectifier circuit 32 for rectifying the stepped-down current, and the rectifier circuits are respectively connected to the trigger circuit 22 and the signal processing and control circuit 4 to provide power thereto;

[0014] The residual current sampling circuit 6 includes a voltage clamping protection circuit 61, a voltage dividing circuit 62 and a filtering circuit 63 connected in sequence. The voltage clamping protection circuit 61 is connected to the mutual inductor 5, and the filtering circuit 63 is connected to the signal processing and control circuit 4, and is used to transmit the filtered current signal to the signal processing and control circuit 4.

[0015] Preferably, it further comprises a test circuit 7, one end of the test circuit 7 is connected to the line 1, and the other end passes through the mutual inductor (5).

[0016] Preferably, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4 connected to the L1 line and connected in series with each other, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8 connected to the L2 line and connected in series with each other, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12 connected to the L3 line and connected in series with each other, and a thirteenth resistor R13 and a fourteenth resistor R14 connected to the N line and connected in series with each other constitute the step-down circuit 31;

[0017] The rectifier circuit 32 includes a first rectifier diode CR11 connected in series with the fourteenth resistor R14, a second rectifier diode CR12 connected in series with the fourth resistor R4, a third rectifier diode CR13 connected in series with the eighth resistor R8, and a fourth rectifier diode CR14 connected in series with the twelfth resistor R12. The first rectifier diode CR11, the second rectifier diode CR12, the third rectifier diode CR13 and the fourth rectifier diode CR14 are connected in parallel to each other to form the rectifier circuit 32. The rectifier circuit 32 is electrically connected to the trigger circuit 22 and the signal processing and control circuit 4, respectively.

[0018] Preferably, the trigger circuit 22 includes a first diode D1, the anode of the first diode D1 is electrically connected to the signal processing and control circuit 4, and the cathode of the first diode D1 is respectively connected to the twenty-first resistor R21, the twenty-second resistor R22, the twentieth capacitor C20 and the nineteenth capacitor C19 to form the trigger circuit 22; the switch circuit 21 includes a release and a thyristor U4, the anode of the thyristor U4 is connected to one end of the release, and the other end of the release is connected to the seventeenth capacitor C17 and the eighteenth capacitor C19. The thyristor U4 is connected to the seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19 and the twentieth capacitor C20 and are grounded; a voltage stabilizing circuit is also arranged between the rectifier circuit 32 and the drive circuit 2, and the voltage stabilizing circuit is a voltage stabilizing diode D2, the anode of the voltage stabilizing diode D2 is connected to the seventeenth capacitor C17 and is grounded, and the cathode of the voltage stabilizing diode D2 is respectively connected to the rectifier circuit 32 and the seventeenth capacitor C17.

[0019] Preferably, the voltage clamping protection circuit 61 includes a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6, which are connected in parallel in opposite directions, and a first capacitor C1 and a second capacitor C2 for decoupling; the voltage divider circuit 62 includes a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18 connected in parallel; the filtering circuit 63 includes two nineteenth resistors R19 and twentieth resistors R20 respectively connected to the voltage divider circuit 62, the nineteenth resistor R19 and the twentieth resistor R20 are connected to the signal processing and control circuit 4 through the third capacitor C3; one end of the third capacitor C3 is also connected to the fourth capacitor C4 and grounded, and the other end of the third capacitor C3 is also connected to the fifth capacitor C5 and grounded.

[0020] Preferably, the signal processing and control circuit 4 includes an A-type high-speed and high-precision leakage protection chip CS54601EO, and the A-type high-speed and high-precision leakage protection chip includes a first pin GND, a second pin IN, a third pin VR, a fourth pin TC1, a fifth pin TC2, a sixth pin TTC, a seventh pin LTC, an eighth pin OVR, a ninth pin OS, a tenth pin VDD, an eleventh pin VDDH, a twelfth pin NC, a thirteenth pin NC, and a fourteenth pin HV; the first pin GND is grounded, the second pin IN and the third pin VR are used to connect to the remaining The current sampling circuit 6 is connected, the fourth pin TC1 is connected to the eleventh capacitor C11 and the twelfth capacitor C12 and is grounded, the fifth pin TC2 is connected to the ninth capacitor C9 and the tenth capacitor C10 and is grounded, the sixth pin TTC is connected to the seventh capacitor C7 and the eighth capacitor C8 and is grounded, the seventh pin LTC is connected to the sixth capacitor C6 and is grounded, the eighth pin OVR is grounded, the ninth pin OS is connected to the driving circuit 2, the tenth pin VDD is connected to the thirteenth capacitor C13 and is grounded, the eleventh pin VDDH is connected to the power supply circuit 3, and is also grounded through the sixteenth capacitor C16.

[0021] Preferably, both ends of the first rectifier diode CR11, the second rectifier diode CR12, the third rectifier diode CR13 and the fourth rectifier diode CR14 include two diodes with the same direction.

[0022] Preferably, the test circuit 7 includes a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27 and a twenty-eighth resistor R28 connected in series with the L3 line.

[0023] Beneficial Effects

[0024] The F-type residual current detection and protection device provided by the present invention can not only detect traditional AC leakage accidents, but also can reliably and effectively identify, warn, or directly perform protection output and cut off power supply for new pulsating DC, high-frequency AC, high-low frequency mixed AC signals, or instantaneous large currents brought by rectification or frequency conversion technology. In addition, it also has the following advantages:

[0025] 1. Chip advantages: Based on the dedicated leakage detection chip CS54601EO, the system power consumption is extremely low; the peripheral circuit is extremely simple, especially the linear step-down current limiting resistor is eliminated, which reduces the cost; the output capacity is very strong, reaching 1mA, which is more than 5 times that of traditional leakage detection chips, ensuring the reliability of output protection;

[0026] 2. The residual current sampling circuit, especially the diode clamping circuit, can effectively protect the subsequent circuit while absorbing the residual oscillating current brought by the transformer to a minimum, thereby greatly improving the tolerance and anti-interference ability to instantaneous large currents. Compared with the traditional AC type and A type current sampling circuits, they cannot avoid the damage or functional loss caused by the impact of instantaneous large currents;

[0027] 3. Driving circuit, with the flexible and powerful driving function of the chip CS54601EO, our driving circuit stores the driving energy in stages through a diode, so as to achieve timely, safe and reliable power disconnection protection when ordinary leakage accidents occur, while effectively shielding the interference caused by instantaneous large current impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of an F-type residual current detection and protection device according to the present invention;

[0030] Figure 2 The present invention provides a circuit diagram of an F-type residual current detection and protection device.

[0031] Graphic marking:

[0032] 1-line, 2-drive circuit, 21-switch circuit, 22-trigger circuit, 3-power supply circuit, 31-step-down circuit, 32-rectifier circuit, 4-signal processing and control circuit, 5-transformer, 6-residual current sampling circuit, 61-voltage clamping protection circuit, 62-voltage divider circuit, 63-filter circuit, 7-test circuit. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, an F-type residual current detection and protection device includes a drive circuit 2, a power supply circuit 3, and a residual current sampling circuit 6 for sampling the residual current in the line 1 through a mutual inductor 5, respectively connected to the line 1, the power supply circuit 3 is respectively connected to the drive circuit 2 and the signal processing and control circuit 4, the residual current sampling circuit 6 transmits the current information detected by the mutual inductor 5 to the signal processing and control circuit 4, and the signal processing and control circuit 4 controls the drive circuit 2 according to the received residual current signal.

[0035] Specifically, the line 1 is a single-phase line or a three-phase line, and the three-phase line includes an L1 line, an L2 line, an L3 line and an N line; the drive circuit 2 includes a switch circuit 21 connected to the line 1 and a trigger circuit 22 for controlling the switch circuit 21; the power supply circuit 3 includes a step-down circuit 31 for stepping down the current in the line 1, and a rectifier circuit 32 for rectifying the stepped-down current, and the rectifier circuit is respectively connected to the trigger circuit 22 and the signal processing and control circuit 4 to provide power thereto; the residual current sampling circuit 6 includes a voltage clamping protection circuit 61, a voltage divider circuit 62 and a filter circuit 63 connected in sequence, the voltage clamping protection circuit 61 is connected to the mutual inductor 5, and the filter circuit 63 is connected to the signal processing and control circuit 4, and is used to transmit the filtered current signal to the signal processing and control circuit 4.

[0036] In order to facilitate testing, a test circuit 7 is also included, one end of which is connected to the line 1, and the other end passes through the mutual inductor (5). Specifically, the test circuit 7 includes a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27 and a twenty-eighth resistor R28 connected in series with the L3 line.

[0037] As a further explanation of this device, Figure 2 As shown, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 connected to the L1 line and connected in series with each other, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 connected to the L2 line and connected in series with each other, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12 connected to the L3 line and connected in series with each other, and the thirteenth resistor R13 and the fourteenth resistor R14 connected to the N line and connected in series with each other constitute the step-down circuit 31; the rectifier circuit 32 includes a first rectifier diode CR11 connected in series with the fourteenth resistor R14, The second rectifier diode CR12 connected in series with the fourth resistor R4, the third rectifier diode CR13 connected in series with the eighth resistor R8, and the fourth rectifier diode CR14 connected in series with the twelfth resistor R12, the first rectifier diode CR11, the second rectifier diode CR12, the third rectifier diode CR13 and the fourth rectifier diode CR14 are connected in parallel to form a three-phase full-wave rectifier circuit, and both ends of the first rectifier diode CR11, the second rectifier diode CR12, the third rectifier diode CR13 and the fourth rectifier diode CR14 include two diodes with the same direction. The rectifier circuit 32 is electrically connected to the trigger circuit 22 and the signal processing and control circuit 4 respectively.

[0038] The trigger circuit 22 includes a first diode D1, the anode of the first diode D1 is electrically connected to the signal processing and control circuit 4 (i.e., the ninth pin OS of the A-type high-speed and high-precision leakage protection chip CS54601EO), and the cathode of the first diode D1 is respectively connected to the twenty-first resistor R21, the twenty-second resistor R22, the twentieth capacitor C20 and the nineteenth capacitor C19 to form the trigger circuit 22 (or energy storage circuit); the switch circuit 21 is composed of a release and a unidirectional or bidirectional thyristor U4 or a thyristor, and the anode of the thyristor U4 is connected to one end of the release The other end of the release is connected to the seventeenth capacitor C17 and the eighteenth capacitor C18, and the cathode of the thyristor U4 is connected to the seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19 and the twentieth capacitor C20 and grounded; a voltage stabilizing circuit is also arranged between the rectifier circuit 32 and the drive circuit 2, and the voltage stabilizing circuit is a voltage stabilizing diode D2, the anode of the voltage stabilizing diode D2 is connected to the seventeenth capacitor C17 and grounded, and the cathode of the voltage stabilizing diode D2 is respectively connected to the rectifier circuit 32 and the seventeenth capacitor C17.

[0039] The voltage clamping protection circuit 61 is composed of a switching diode or a voltage regulator or a Schottky diode or a combination thereof. In this embodiment, the voltage clamping protection circuit 61 includes a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6 connected in parallel in opposite directions, and a first capacitor C1 and a second capacitor C2 for decoupling; the cathode of the third diode D3 is connected to the ZCT1 end of the current transformer, and the anode of the third diode D3 is connected to the ZCT2 end of the current transformer; the voltage divider circuit 62 is composed of resistors and capacitors, including a third diode D3 connected in parallel to each other. The fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17 and the eighteenth resistor R18; the filtering circuit 63 is a differential mode or common mode noise filtering circuit composed of resistor and capacitor elements, including two nineteenth resistors R19 and twentieth resistors R20 respectively connected to the voltage divider circuit 62, the nineteenth resistor R19 and the twentieth resistor R20 are connected to the signal processing and control circuit 4 through the third capacitor C3; one end of the third capacitor C3 is also connected to the fourth capacitor C4 and grounded, and the other end of the third capacitor C3 is also connected to the fifth capacitor C5 and grounded.

[0040] In this embodiment, the signal processing and control circuit 4 includes an A-type high-speed and high-precision leakage protection chip CS54601EO, and the A-type high-speed and high-precision leakage protection chip includes a first pin GND, a second pin IN, a third pin VR, a fourth pin TC1, a fifth pin TC2, a sixth pin TTC, a seventh pin LTC, an eighth pin OVR, a ninth pin OS, a tenth pin VDD, an eleventh pin VDDH, a twelfth pin NC, a thirteenth pin NC, and a fourteenth pin HV; the first pin GND is grounded, the second pin IN and the third pin VR are used to connect to the residual The residual current sampling circuit 6 is connected, the fourth pin TC1 is connected to the eleventh capacitor C11 and the twelfth capacitor C12 and grounded, the fifth pin TC2 is connected to the ninth capacitor C9 and the tenth capacitor C10 and grounded, the sixth pin TTC is connected to the seventh capacitor C7 and the eighth capacitor C8 and grounded, the seventh pin LTC is connected to the sixth capacitor C6 and grounded, the eighth pin OVR is grounded, the ninth pin OS is connected to the driving circuit 2, the tenth pin VDD is connected to the thirteenth capacitor C13 and grounded, the eleventh pin VDDH is connected to the power supply circuit 3, and is also grounded through the sixteenth capacitor C16.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An F-type residual current detection and protection device, characterized in that: it includes a drive circuit (2), a power supply circuit (3) respectively connected to a line (1), and a residual current sampling circuit (6) that samples the residual current in the line (1) through a current transformer (5). The power supply circuit (3) is respectively connected to the drive circuit (2) and a signal processing and control circuit (4). The residual current sampling circuit (6) transmits the current information detected by the current transformer (5) to the signal processing and control circuit (4), and the signal processing and control circuit (4) controls the drive circuit (2) according to the received residual current signal; the line (1) is a single-phase line or a three-phase line, and the three-phase line includes an L1 line, an L2 line, an L3 line and an N line; the drive circuit (2) includes a switch circuit (21) connected to the line (1) and a trigger circuit (22) that controls the switch circuit (21); the power supply circuit (3) includes a buck circuit (31) for bucking the current in the line (1), and a rectifier circuit (32) for rectifying the bucked current. The rectifier circuit is respectively connected to the trigger circuit (22) and the signal processing and control circuit (4) to provide power for them; the residual current sampling circuit (6) includes a voltage clamping protection circuit (61), a voltage dividing circuit (62) and a filtering circuit (63) connected in sequence. The voltage clamping protection circuit (61) is connected to the current transformer (5), and the filtering circuit (63) is connected to the signal processing and control circuit (4) for transmitting the filtered current signal to the signal processing and control circuit (4); it further includes a test circuit (7). One end of the test circuit (7) is connected to the line (1), and the other end passes through the current transformer (5); The voltage clamping protection circuit (61) includes four third diodes (D3), a fourth diode (D4), a fifth diode (D5), and a sixth diode (D6) connected in parallel with each other, and a first capacitor (C1) and a second capacitor (C2) for decoupling; wherein, the cathodes of the third diode (D3), the fourth diode (D4), the fifth diode (D5), and the sixth diode (D6) are connected to each other, and the anodes of the third diode (D3), the fourth diode (D4), the fifth diode (D5), and the sixth diode (D6) are connected to each other; the voltage dividing circuit (62) includes a seventeenth resistor (R17) and an eighteenth resistor (R18) connected in parallel with each other, and a fifteenth resistor (R15) and a sixteenth resistor (R16) are respectively connected to both ends of the seventeenth resistor (R17); the filtering circuit (63) includes a nineteenth resistor (R19) and a twentieth resistor (R20) respectively connected to the voltage dividing circuit (62), the nineteenth resistor (R19) and the twentieth resistor (R20) are respectively connected to the signal processing and control circuit (4), and a third capacitor (C3) is connected in parallel between the nineteenth resistor (R19) and the twentieth resistor (R20); one end of the third capacitor (C3) is also connected to a fourth capacitor (C4) grounded, and the other end of the third capacitor (C3) is also connected to a fifth capacitor (C5) and grounded.

2. The F-type residual current detection and protection device according to claim 1, characterized in that: A first resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R4) connected in series with each other and connected to the L1 line, a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), and an eighth resistor (R8) connected in series with each other and connected to the L2 line, a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), and a twelfth resistor (R12) connected in series with each other and connected to the L3 line, and a thirteenth resistor (R13) and a fourteenth resistor (R14) connected in series with each other and connected to the N line constitute the step-down circuit (31); The rectifying circuit (32) includes a first rectifying diode (CR11) connected in series with the fourteenth resistor (R14), a second rectifying diode (CR12) connected in series with the fourth resistor (R4), a third rectifying diode (CR13) connected in series with the eighth resistor (R8), and a fourth rectifying diode (CR14) connected in series with the twelfth resistor (R12). The first rectifying diode (CR11), the second rectifying diode (CR12), the third rectifying diode (CR13), and the fourth rectifying diode (CR14) are connected in parallel with each other to form the rectifying circuit (32), and the rectifying circuit (32) is respectively electrically connected to the trigger circuit (22) and the signal processing and control circuit (4).

3. An F-type residual current detection and protection device according to claim 2, characterized in that: the trigger circuit (22) includes a first diode (D1), the anode of the first diode (D1) is electrically connected to the signal processing and control circuit (4), the cathode of the first diode (D1) is connected to a twenty-first resistor (R21), a twentieth capacitor (C20) and a nineteenth capacitor (C19), and the twenty-first resistor (R21) and the twentieth capacitor (C20) are respectively connected to a twenty-second resistor (R22) to form the trigger circuit (22); the switch circuit (21) includes a trip device and a thyristor (U4), the anode of the thyristor (U4) is connected to one end of the trip device, the other end of the trip device is connected to a seventeenth capacitor (C17) and an eighteenth capacitor (C18), the cathode of the thyristor (U4) is connected to the seventeenth capacitor (C17), the eighteenth capacitor (C18), the nineteenth capacitor (C19) and the twentieth capacitor (C20) and grounded; a voltage stabilizing circuit is further provided between the rectifying circuit (32) and the driving circuit (2), the voltage stabilizing circuit is a voltage stabilizing diode (D2), the anode of the voltage stabilizing diode (D2) is connected to the seventeenth capacitor (C17) and grounded, the cathode of the voltage stabilizing diode (D2) is connected to one end of the seventeenth capacitor (C17), and the anode of the voltage stabilizing diode (D2) is connected to the other end of the seventeenth capacitor (C17).

4. An F-type residual current detection and protection device according to claim 1, characterized in that: The signal processing and control circuit (4) includes a high-speed and high-precision type-A leakage protection chip CS54601EO. The high-speed and high-precision type-A leakage protection chip includes a first pin (GND), a second pin (IN), a third pin (VR), a fourth pin (TC1), a fifth pin (TC2), a sixth pin (TTC), a seventh pin (LTC), an eighth pin (OVR), a ninth pin (OS), a tenth pin (VDD), an eleventh pin (VDDH), a twelfth pin (NC), a thirteenth pin (NC), and a fourteenth pin (HV); the first pin (GND) is grounded, the second pin (IN) and the third pin (VR) are used to connect to the residual current sampling circuit (6), the fourth pin (TC1) is connected to the eleventh capacitor (C11) and the twelfth capacitor (C12) and grounded, the fifth pin (TC2) is connected to the ninth capacitor (C9) and the tenth capacitor (C10) and grounded, the sixth pin (TTC) is connected to the seventh capacitor (C7) and the eighth capacitor (C8) and grounded, the seventh pin (LTC) is connected to the sixth capacitor (C6) and grounded, the eighth pin (OVR) is grounded, the ninth pin (OS) is connected to the drive circuit (2), the tenth pin (VDD) is connected to the thirteenth capacitor (C13) and grounded, the eleventh pin (VDDH) is connected to the power supply circuit (3) and is also grounded through the sixteenth capacitor (C16).

5. The F-type residual current detection and protection device according to claim 2, characterized in that: Both ends of the first rectifying diode (CR11), the second rectifying diode (CR12), the third rectifying diode (CR13) and the fourth rectifying diode (CR14) include two diodes with the same direction.

6. The F-type residual current detection and protection device according to claim 1, characterized in that: The test circuit (7) includes a twenty-fourth resistor (R24), a twenty-fifth resistor (R25), a twenty-sixth resistor (R26), a twenty-seventh resistor (R27) and a twenty-eighth resistor (R28) connected in series with the L3 line.

Images