CN219843426U - Anti-electromagnetic interference leakage detection protection circuit - Google Patents
Anti-electromagnetic interference leakage detection protection circuit Download PDFInfo
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- CN219843426U CN219843426U CN202320073454.6U CN202320073454U CN219843426U CN 219843426 U CN219843426 U CN 219843426U CN 202320073454 U CN202320073454 U CN 202320073454U CN 219843426 U CN219843426 U CN 219843426U
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000001914 filtration Methods 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012356 Product development Methods 0.000 abstract 1
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- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of leakage protection, in particular to an anti-electromagnetic interference leakage detection protection circuit, which comprises a signal circuit, a filter circuit and a control circuit which are sequentially connected, wherein the filter circuit is electrically connected with the control circuit; the control circuit comprises a common mode inductance L1 and a leakage detection chip U1. Through independently setting up filter circuit and control circuit, adopt electric connection for leakage detection protection device is under the condition of normal function, only need change filter circuit just can accord with the product of anti-electromagnetic interference ability, and this device can strengthen the anti-interference ability of product, shortens product development cycle, reduction in production cost.
Description
Technical Field
The utility model relates to the technical field of leakage protection, in particular to an anti-electromagnetic interference leakage detection protection circuit.
Background
With the current converter, the switching device and the energy-saving equipment being widely applied in life and production at present, the electric leakage detection protection device is indispensable; however, because various complicated household appliances and industrial equipment can generate a lot of noise and signal interference in the running process, the stabilizer and the practicability of the leakage detection protection device are seriously affected by the excessive noise and interference; the phenomena of misjudgment, tripping and the like caused by signal interference in the use process or the situation of product failure caused by noise in the use process occur, and the service life of the electric appliance and the personal safety of users are seriously endangered.
Therefore, there is an urgent need for an anti-electromagnetic interference leakage detection protection circuit with low cost and simple structure.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and provides an anti-electromagnetic interference leakage detection protection circuit which is used for solving the technical problems of noise and signal interference in the traditional leakage detection protection device.
The above purpose is realized by the following technical scheme:
the leakage detection protection circuit comprises a signal circuit, a filter circuit and a control circuit which are sequentially connected, wherein the filter circuit is electrically connected with the control circuit; the control circuit comprises a common mode inductance L1 and a leakage detection chip U1.
Further, the signal circuit comprises a zero sequence current transformer ZCT, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8 and a tenth resistor R10 which are sequentially connected; the zero sequence current transformer ZCT clamps the induced leakage signal through a clamping diode formed by the fifth diode D5, the sixth diode D6, the seventh diode D7 and the eighth diode D8, and amplifies the leakage signal induced by the zero sequence current transformer ZCT through the tenth resistor R10, so as to obtain a detectable electrical signal.
Further, the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8 are all of the model number RB751S40.
Further, the filter circuit comprises an eighth resistor R8, a ninth resistor R9, an eleventh capacitor C11, a twelfth resistor R12, a thirteenth resistor R13 and a second capacitor C2, wherein the eighth resistor R8 and the ninth resistor R9 step down leakage signals, the eleventh capacitor C11 charges and decouples the leakage signals, and the eighth resistor R8, the ninth resistor R9 and the eleventh capacitor C11 form a first-order high-pass filter circuit to filter waveforms of the leakage signals and eliminate clutters; the twelfth resistor R12 and the thirteenth resistor R13 step down the processed signal, the second capacitor C2 charges and decouples the leakage signal again, and the twelfth resistor R12, the thirteenth resistor R13 and the second capacitor C2 form a first-order low-pass filter circuit to filter the waveform of the leakage signal and eliminate clutter.
Further, the filtering circuit further comprises a first capacitor C1 and a third capacitor C3 to the ground, and the leakage signal after twice filtering is processed again to filter the high-frequency ripple capacity of the electric signal, filter the clutter signal and output the electric signal to the control circuit for stabilizing.
Further, the leakage detection chip U1 has a model G4601, and 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 NC2, a thirteenth pin NC1, and a fourteenth pin HV, where the second pin IN and the third pin VR are respectively connected to the common mode inductor L1.
Further, the impedance of the common-mode inductor L1 is 360 Ω, and the frequency is 100MHz.
Advantageous effects
According to the anti-electromagnetic interference leakage detection protection circuit, the filter circuit and the control circuit are independently arranged and are electrically connected, so that the anti-electromagnetic interference product can be met by changing the filter circuit under the condition of normal functions of the leakage detection protection device.
Drawings
Fig. 1 is a schematic circuit diagram of an anti-electromagnetic interference leakage detection protection circuit according to the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the figures and examples.
As shown in fig. 1, an anti-electromagnetic interference leakage detection protection circuit comprises a signal circuit, a filter circuit and a control circuit which are sequentially connected, wherein the filter circuit is electrically connected with the control circuit; the control circuit comprises a common mode inductance L1 and a leakage detection chip U1. The device processes signals through a filter circuit formed by the resistance-capacitance and the common-mode inductance to form signals resisting electromagnetic interference, and the signals are transmitted to a control circuit.
The signal circuit in this embodiment includes a zero sequence current transformer ZCT, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, and a tenth resistor R10, which are sequentially connected; the zero sequence current transformer ZCT clamps the induced leakage signal through a clamping diode formed by the fifth diode D5, the sixth diode D6, the seventh diode D7 and the eighth diode D8, and amplifies the leakage signal induced by the zero sequence current transformer ZCT through the tenth resistor R10, so as to obtain a detectable electrical signal.
The fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8 are all of the type RB751S40.
The filter circuit in this embodiment includes an eighth resistor R8, a ninth resistor R9, an eleventh capacitor C11, a twelfth resistor R12, a thirteenth resistor R13, and a second capacitor C2, where the eighth resistor R8, the ninth resistor R9, and the eleventh capacitor C11 form a first-order high-pass filter circuit, and filter waveforms of leakage signals to eliminate clutter; namely, the eighth resistor R8 and the ninth resistor R9 step down the leakage signal, and the eleventh capacitor C11 charges and decouples the leakage signal;
the twelfth resistor R12, the thirteenth resistor R13 and the second capacitor C2 form a first-order low-pass filter circuit, and the waveform of the leakage signal is filtered to eliminate clutter; namely, the twelfth resistor R12 and the thirteenth resistor R13 step down the processed signal, and the second capacitor C2 charges and decouples the leakage signal again.
The filtering circuit further comprises a first capacitor C1 and a third capacitor C3 which are grounded, the leakage signals after the twice filtering are processed again, the high-frequency ripple capacity is used for filtering out the electric signals, the clutter signals are filtered out, and the electric signals are output to the control circuit for stabilizing.
The leakage detection chip U1 IN this embodiment has a model G4601, and 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 NC2, a thirteenth pin NC1, and a fourteenth pin HV, where the second pin IN and the third pin VR are respectively connected to the common mode inductor L1.
The impedance of the common mode inductor L1 is 360 Ω, and the frequency is 100MHz.
When the leakage current signal passes through the common mode inductor, the common mode current is in the same direction in the common mode inductor, and a same-direction magnetic field is generated in the common mode inductor; at this time, the inductance of the common-mode inductor increases, and the inductance to the common-mode current is suppressed more, so that the common-mode current is attenuated, and the common-mode noise is suppressed. The signal processed by the common mode inductance is transmitted to the electric leakage detection chip U1 to form a starting signal of the control circuit.
While the utility model has been described with respect to the preferred embodiments, it is to be understood that the utility model is not limited thereto, but is capable of modification and substitution within the spirit and scope of the utility model as will be apparent to those skilled in the art. Therefore, the protection scope of the present utility model should be subject to the claims.
Claims (7)
1. The leakage detection protection circuit is characterized by comprising a signal circuit, a filter circuit and a control circuit which are sequentially connected, wherein the filter circuit is electrically connected with the control circuit; the control circuit comprises a common mode inductance (L1) and a leakage detection chip (U1).
2. The leakage detection protection circuit against electromagnetic interference according to claim 1, wherein the signal circuit comprises a zero sequence current transformer (ZCT), a fifth diode (D5), a sixth diode (D6), a seventh diode (D7), an eighth diode (D8) and a tenth resistor (R10) connected in sequence; the zero sequence current transformer (ZCT) clamps the induced leakage signal through a clamping diode formed by the fifth diode (D5), the sixth diode (D6), the seventh diode (D7) and the eighth diode (D8), and amplifies the leakage signal induced by the zero sequence current transformer (ZCT) through the tenth resistor (R10) to obtain a detectable electric signal.
3. The leakage detection protection circuit against electromagnetic interference according to claim 2, wherein the fifth diode (D5), the sixth diode (D6), the seventh diode (D7) and the eighth diode (D8) are all of the type RB751S40.
4. The leakage detection protection circuit for resisting electromagnetic interference according to claim 1, wherein the filter circuit comprises an eighth resistor (R8), a ninth resistor (R9), an eleventh capacitor (C11), a twelfth resistor (R12), a thirteenth resistor (R13) and a second capacitor (C2), and the eighth resistor (R8), the ninth resistor (R9) and the eleventh capacitor (C11) form a first-order high-pass filter circuit for filtering waveforms of leakage signals and eliminating clutter; the twelfth resistor (R12), the thirteenth resistor (R13) and the second capacitor (C2) form a first-order low-pass filter circuit, and the waveform of the leakage signal is filtered to eliminate clutter.
5. The anti-electromagnetic interference leakage detection protection circuit according to claim 3, wherein the filter circuit further comprises a first capacitor (C1) and a third capacitor (C3) to ground, for filtering out high-frequency ripple capability of the electrical signal, filtering out a spurious signal, and outputting the spurious signal to the control circuit for stabilizing the electrical signal.
6. The leakage detection protection circuit against electromagnetic interference according to claim 1, wherein the leakage detection chip (U1) has a model G4601 and comprises a first pin (GND), a second pin (IN), a third pin (VR), a fourth pin (TC 1), a fifth pin (TC 2), 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 2), a thirteenth pin (NC 1) and a fourteenth pin (HV), and wherein the second pin (IN) and the third pin (VR) are connected to the common mode inductance (L1), respectively.
7. The leakage detection protection circuit according to claim 1, wherein the impedance of the common mode inductor (L1) is 360 Ω and the frequency is 100MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320073454.6U CN219843426U (en) | 2023-01-10 | 2023-01-10 | Anti-electromagnetic interference leakage detection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320073454.6U CN219843426U (en) | 2023-01-10 | 2023-01-10 | Anti-electromagnetic interference leakage detection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219843426U true CN219843426U (en) | 2023-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320073454.6U Active CN219843426U (en) | 2023-01-10 | 2023-01-10 | Anti-electromagnetic interference leakage detection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219843426U (en) |
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2023
- 2023-01-10 CN CN202320073454.6U patent/CN219843426U/en active Active
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