CN212727504U - Ground detection circuit and LED drive circuit with ground detection function - Google Patents
Ground detection circuit and LED drive circuit with ground detection function Download PDFInfo
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- CN212727504U CN212727504U CN202022155804.2U CN202022155804U CN212727504U CN 212727504 U CN212727504 U CN 212727504U CN 202022155804 U CN202022155804 U CN 202022155804U CN 212727504 U CN212727504 U CN 212727504U
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Abstract
The utility model provides a grounding detection circuit, which is provided with an input end, an output end and a negative electrode; the input end of the grounding detection circuit is connected with the grounding end of an electric appliance; the full-bridge rectifier circuit is provided with two alternating current input ends, a positive output end and a negative output end; one alternating current input end is connected with a live wire access end of the electric appliance, the other alternating current input end is connected with a zero line access end of the electric appliance, and the negative electrode of the grounding detection circuit is connected with the negative output end of the full-bridge rectification circuit; when the grounding end of the electric appliance is connected with the grounding wire of the commercial power or not connected with the grounding wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit. The utility model also provides a LED drive circuit with ground connection detects the function.
Description
Technical Field
The utility model relates to an electrical apparatus or LED lamp with earthing terminal especially involves ground connection detection circuitry and has the LED drive circuit of ground connection detection function.
Background
The common commercial power grid comprises a live wire, a zero line and a ground wire. The live wire and the zero wire provide alternating voltage, the zero wire and the ground wire are both connected with the ground, and the voltage to the ground is zero. The basic function of connecting the electric or electronic equipment to the ground wire is to prevent people from electric shock accidents when using the electric or electronic equipment.
Therefore, when the electric appliance with the grounding terminal is used, the grounding terminal is forcibly required to be connected with the ground wire of the commercial power. Moreover, some electrical appliances, such as LED lighting fixtures, are connected to the ground of the utility power through the ground terminal, and the EMI index thereof can meet the national standard, and radio interference to other electrical appliances may be generated if the electrical appliances are not grounded.
The ground terminal of the common electric appliance is connected with the exposed conductive component, and can be connected with the live wire connecting terminal and the zero wire connecting terminal through a Y2 capacitor; in a simplified case, the ground is connected only to the live connection via a Y2 capacitor, or only to the neutral connection via a Y2 capacitor. As shown in fig. 1.
Many LED lamps used outdoors and easily touched by people are electrical appliances with grounding terminals, and such LED lamps usually adopt a metal exposed design due to heat dissipation. Such LED lamps require a ground connection to the mains when installed.
The circuit of such LED lamps generally comprises: the commercial power access circuit, power conversion circuit, LED luminescent circuit.
The commercial power access circuit converts commercial power alternating voltage into direct current voltage and is provided with a live wire input end, a zero line input end, a grounding end, a positive output end and a negative output end. The commercial power access circuit comprises a full-bridge rectifier bridge stack, a first Y2 capacitor and a second Y2 capacitor. Two AC input ends of the full-bridge rectifier circuit are used for connecting a live wire and a zero wire of a mains supply, one end of a first Y2 capacitor and one end of a second Y2 capacitor are respectively connected with the two AC input ends of the full-bridge rectifier circuit, the other end of the first Y2 capacitor and the other end of the second Y2 capacitor are connected with exposed metal parts of the LED lamp, and the connecting ends of the LED lamp are grounded ends of the LED lamp.
The grounding end of the LED lamp is connected with the commercial power ground wire, so that the LED lamp has a safety protection effect on one hand, and can meet the requirement of EMI (electro-magnetic interference) more easily on the other hand.
The power conversion circuit is used for converting the direct-current voltage output by the commercial power access circuit into constant voltage or current to drive the LED circuit to emit light. The power conversion circuit is provided with a positive pole, a negative pole and at least one output end, wherein the positive pole of the power conversion circuit is connected with the positive output end of the commercial power access circuit, the negative pole of the power conversion circuit is connected with the negative output end of the commercial power access circuit, and the output end of the power conversion circuit is connected with the LED light-emitting circuit.
The typical power conversion circuit is internally provided with an integrated circuit for controlling conversion states and a high-frequency transformer, wherein the high-frequency transformer is at least provided with two coupling coils, one is a main coil, and the other is an auxiliary coil. One end of the auxiliary coil is connected with the negative electrode of the integrated circuit, the connecting end is connected with the negative electrode of the power conversion circuit, the other end of the auxiliary coil is marked as an A end, the A end not only provides an electric signal of the working state of the main coil of the high-frequency transformer, but also provides low voltage required by the power conversion circuit during working, and the A end is connected to a power supply voltage input end of the integrated circuit after being processed by other internal circuits to provide working voltage for the integrated circuit. The supply voltage input terminal of the integrated circuit is labeled as terminal B, which has a higher voltage threshold and a lower voltage threshold.
When the integrated circuit does not work, the external starting circuit enables the voltage of the end B to rise, the integrated circuit starts to work after the voltage of the end B rises to be larger than or equal to a higher voltage threshold value, the integrated circuit keeps working as long as the voltage of the end B is kept to be larger than or equal to a lower voltage threshold value, when the integrated circuit works, the power conversion circuit drives the LED light-emitting circuit to emit light, and meanwhile, the end A of the auxiliary coil outputs voltage.
If the voltage of the end B is reduced to be less than the low voltage threshold value when the integrated circuit works, the integrated circuit stops working, the power conversion circuit does not output current or voltage any more, the LED light-emitting circuit cannot be driven to emit light, and meanwhile, the end A of the auxiliary coil stops outputting the voltage. Shown in FIG. 2
Since an electrical appliance including an LED lamp with a ground terminal can normally operate without being connected to a commercial power ground even if its insulating property is lowered or fails and an external conductive member is already electrified, it sometimes happens that the ground terminal of such an electrical appliance is not connected to the commercial power ground for convenience of the installer or for cost saving.
Therefore, if the insulation performance of the electric appliance is deteriorated or failed in the using process and if the electric appliance is not grounded, accidents of accidental electric shock are likely to happen.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that ground connection detection circuitry, when the electrical apparatus that has the earthing terminal does not have ground connection, ground connection detection circuitry can export the unusual control signal of ground connection to send the warning signal that electrical apparatus does not have ground connection to people.
In order to solve the above technical problem, the present invention provides a ground fault detection circuit, which has an input terminal, an output terminal and a negative electrode; the input end of the grounding detection circuit is connected with the grounding end of an electric appliance;
the full-bridge rectifier circuit is provided with two alternating current input ends, a positive output end and a negative output end; one alternating current input end is connected with a live wire access end of the electric appliance, the other alternating current input end is connected with a zero line access end of the electric appliance, and the negative electrode of the grounding detection circuit is connected with the negative output end of the full-bridge rectification circuit;
when the grounding end of the electric appliance is connected with the grounding wire of the commercial power or not connected with the grounding wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
The utility model also provides a grounding detection circuit, which is provided with an input end, an output end and a negative electrode; the input end of the grounding detection circuit is connected with the grounding end of an electric appliance;
the negative electrode of the grounding detection circuit is connected with the negative output end of a full-bridge rectification circuit of the electric appliance;
when the grounding end of the electric appliance is connected with the grounding wire of the commercial power or not connected with the grounding wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
In a preferred embodiment: when the grounding end of the electric appliance is connected with the ground wire of the commercial power well, the output end of the grounding detection circuit is conducted with the negative electrode; when the grounding end of the electric appliance is not well connected with the ground wire of the mains supply, the output end of the grounding detection circuit is cut off from the negative pole.
In a preferred embodiment: the grounding detection circuit is connected with the acousto-optic warning circuit.
In a preferred embodiment: the grounding detection circuit comprises a first diode, a second diode, a first resistor, a second resistor, a first capacitor and a first MOS (metal oxide semiconductor) tube;
the positive pole of the first diode is the input end of the grounding detection circuit, the negative pole of the first diode is connected with one end of the first resistor, the other end of the first resistor, one end of the second resistor, the negative pole of the second diode, one end of the first capacitor is connected with the grid electrode of the first MOS tube, and the drain electrode of the first MOS tube is the output end of the grounding detection circuit. The other end of the second resistor, the anode of the second diode, the other end of the first capacitor and the source electrode of the first MOS tube are connected, and the connecting end of the first capacitor is the cathode of the grounding detection circuit.
The utility model also provides a LED drive circuit with ground connection detects the function, include: the circuit comprises a grounding detection circuit, a matching control circuit and an LED drive circuit;
the LED driving circuit is provided with a live wire input end, a zero line input end and a grounding end; the input end of the grounding detection circuit is connected with the grounding end of the LED drive circuit, the output end of the grounding detection circuit is connected with the input end of the matching control circuit, the positive electrode of the matching control circuit is connected with the end A of the auxiliary coil of the LED drive circuit, and the control end of the matching control circuit is connected with the end B of the auxiliary coil of the LED drive circuit; the negative electrode of the grounding detection circuit and the negative electrode of the matching control circuit are connected with the negative electrode of the power conversion circuit of the LED drive circuit;
when the grounding end of the LED driving circuit is connected with the ground wire of the commercial power or not connected with the ground wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
In a preferred embodiment: when the grounding end of the LED driving circuit is connected with the ground wire, the output end of the grounding detection circuit is cut off, the output end and the negative electrode of the matching control circuit are kept in a cut-off state, and the LED driving circuit normally drives the LED lamp to be turned on.
In a preferred embodiment: when the grounding end of the LED driving circuit is not connected with the ground wire, the output end and the negative electrode of the matching control circuit are periodically switched to be in an off state and an on state, and the LED driving circuit periodically drives the LED lamp to be turned on and off.
In a preferred embodiment: the matching control circuit comprises a third diode, a fourth diode, a third resistor, a fourth resistor, a fifth resistor, a second capacitor and a second MOS (metal oxide semiconductor) tube;
the positive pole of third diode does match control circuit's positive pole, and the negative pole of third diode and the one end of third resistance are connected, and the other end of third resistance and the one end of fourth resistance, the negative pole of fourth diode, the positive pole of second electric capacity is connected, the other end of fourth resistance, and the one end of fifth resistance and the grid of second MOS pipe are connected, and its link does match control circuit's input, the drain electrode of second MOS pipe does match control circuit's output, the positive pole of fourth diode, the negative pole of second electric capacity, the other end of fifth resistance and the source electrode of second MOS pipe are connected, and its link does match control circuit's negative pole.
In a preferred embodiment: the third diode is a rectifier diode, the fourth diode is a voltage stabilizing diode, and the second capacitor is an electrolytic capacitor.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
the utility model provides a ground connection detection circuitry and LED drive circuit who has ground connection detection function through increasing a small amount of discrete components and parts, has realized can normally working when ground connection. And when the grounding is not carried out, reminding and requiring the user to connect the ground wire. Has the advantages of simple technology, reliable performance and low cost.
Drawings
FIG. 1 illustrates several conventional ways for connecting the ground terminal of a class I electrical device to the zero line of a live wire;
FIG. 2 is a typical LED driver circuit configuration using the prior art;
FIG. 3 is a diagram of the connection structure of the ground detection circuit and the full-bridge rectification circuit of the present invention;
fig. 4 is a schematic diagram of the ground detection circuit of the present invention;
fig. 5 is a circuit diagram of the LED driving circuit with ground fault detection function according to the present invention;
fig. 6 is a schematic circuit diagram of the matching control circuit of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected," may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements.
Example 1
Referring to fig. 3 and 4, a ground detection circuit having an input, an output and a negative terminal; the input end of the grounding detection circuit is connected with the grounding end of an electric appliance;
the full-bridge rectifier circuit is provided with two alternating current input ends, a positive output end and a negative output end; one alternating current input end is connected with a live wire access end of the electric appliance, the other alternating current input end is connected with a zero line access end of the electric appliance, and the negative electrode of the grounding detection circuit is connected with the negative output end of the full-bridge rectification circuit;
when the grounding end of the electric appliance is connected with the grounding wire of the commercial power or not connected with the grounding wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
In this embodiment, the different electrical signals specifically refer to: when the grounding end of the electric appliance is connected with the ground wire of the commercial power well, the output end of the grounding detection circuit is conducted with the negative electrode; when the grounding end of the electric appliance is not well connected with the ground wire of the mains supply, the output end of the grounding detection circuit is cut off from the negative pole.
In order to remind the user, the grounding detection circuit is connected with the acousto-optic warning circuit. The acousto-optic warning circuit sends out different warning signals when the grounding state and the non-grounding state are in the on-off state by utilizing the on-off state between the output end and the negative electrode of the grounding detection circuit on the premise of not influencing the work of the electric appliance, so that a user can know whether the electric shock risk exists or not.
In this embodiment, to implement the above circuit principle, the ground detection circuit includes a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a first capacitor C1, and a first MOS transistor Q1, where the first diode D1 is a rectifier diode and the second diode D2 is a zener diode. The positive pole of the first diode D1 is the input end of the grounding detection circuit, the negative pole of the first diode D1 is connected with one end of the first resistor R1, the other end of the first resistor R1, one end of the second resistor R2, the negative pole of the second diode D2, one end of the first capacitor C1 is connected with the gate of the first MOS tube Q1, and the drain of the first MOS tube Q1 is the output end of the grounding detection circuit. The other end of the second resistor R2, the anode of the second diode D2, the other end of the first capacitor C1 and the source of the first MOS transistor Q1 are connected, and the connection end of the first capacitor C1 is the cathode of the grounding detection circuit.
When the live wire access end and the zero line access end of the electric appliance are connected with the alternating voltage of the commercial power, the alternating current input end and the zero line input end of the full-bridge rectification circuit are respectively connected with the live wire and the zero line of the commercial power. If the grounding end of the electric appliance is connected with the grounding wire of the commercial power well, the drain electrode and the source electrode of the first MOS tube Q1 are conducted, namely the output end and the negative electrode of the grounding detection circuit are conducted; if the ground terminal of the electric appliance is not well connected with the ground wire of the commercial power, the drain electrode and the source electrode of the first MOS tube Q1 are cut off, namely the output end and the negative electrode of the ground detection circuit are cut off.
Example 2
In this embodiment, an original full-bridge rectification circuit of the electrical appliance is utilized, and therefore, the negative electrode of the ground detection circuit is connected to the negative output end of the full-bridge rectification circuit of the electrical appliance. The rest is the same as example 1 and will not be described again.
Example 3
Referring to fig. 5 and 6, the present embodiment provides an LED driving circuit with a ground detection function, including: the circuit comprises a grounding detection circuit, a matching control circuit and an LED drive circuit;
the LED driving circuit is provided with a live wire input end, a zero line input end and a grounding end; the input end of the grounding detection circuit is connected with the grounding end of the LED drive circuit, the output end of the grounding detection circuit is connected with the input end of the matching control circuit, the positive electrode of the matching control circuit is connected with the end A of the auxiliary coil of the LED drive circuit, and the control end of the matching control circuit is connected with the end B of the auxiliary coil of the LED drive circuit; the negative electrode of the grounding detection circuit and the negative electrode of the matching control circuit are connected with the negative electrode of the power conversion circuit of the LED drive circuit;
when the grounding end of the LED driving circuit is connected with the ground wire of the commercial power or not connected with the ground wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
Specifically, the different electrical signals in this embodiment refer to: when the grounding end of the LED driving circuit is connected with the ground wire, the output end of the grounding detection circuit is cut off, the output end and the negative electrode of the matching control circuit are kept in a cut-off state, and the LED driving circuit normally drives the LED lamp to be turned on.
When the grounding end of the LED driving circuit is not connected with the ground wire, the output end and the negative electrode of the matching control circuit are periodically switched to be in an off state and an on state, and the LED driving circuit periodically drives the LED lamp to be turned on and off.
In order to achieve the above circuit control effect, the matching control circuit includes a third diode D3, a fourth diode D4, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, and a second MOS transistor Q2;
the anode of the third diode D3 is the anode of the matching control circuit, the cathode of the third diode D3 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with one end of a fourth resistor R4, the cathode of the fourth diode D4, the anode of the second capacitor C2 is connected, the other end of the fourth resistor R4, one end of the fifth resistor R5 is connected with the gate of the second MOS transistor Q2, the connection end of the fifth resistor R5 is the input end of the matching control circuit, the drain of the second MOS transistor Q2 is the output end of the matching control circuit, the anode of the fourth diode D4, the cathode of the second capacitor C2, the other end of the fifth resistor R5 is connected with the source of the second MOS transistor Q2, and the connection end of the fifth diode D6356 is the cathode of the matching control circuit.
The third diode D3 is a rectifier diode, the fourth diode D4 is a zener diode, and the second capacitor C2 is an electrolytic capacitor.
When the utility model discloses a LED drive circuit with ground connection detection function inserts mains voltage through its alternating current input end and zero line input end, if its earthing terminal and ground wire are connected, ground connection detection circuit's output end, so the output and the negative pole of matching control circuit keep for the off-state, can not influence the voltage of B end, current LED drive circuit normally works.
Namely the utility model discloses a LED drive circuit with ground connection detects function is in normal luminous state when connecting the ground wire.
When the grounding end of the LED driving circuit with the grounding detection function is not connected with the ground wire of the commercial power and the LED driving circuit with the grounding detection function is just connected with the commercial power, although the grounding detection circuit outputs a cut-off state signal, because the matching control circuit is not connected with the voltage, the output end and the negative electrode of the matching control circuit are in a cut-off state, when the voltage of the B end of the existing LED driving circuit is increased to be more than or equal to the higher voltage threshold value of the B end of the existing LED driving circuit, the LED driving circuit starts to emit light and the A end starts to output the voltage.
When the matching control circuit is electrified from the A end access voltage to work, the output end and the negative electrode of the matching control circuit are changed into a conducting state from a cut-off state, the B end voltage of the LED drive circuit is reduced to zero and is lower than a lower voltage threshold value, the LED drive circuit is changed into non-luminescence, and meanwhile, the voltage output by the A end is zero.
After the A end has no voltage output, the matching control circuit stops working due to power loss, and the output end and the negative electrode of the matching control circuit are restored to the cut-off state. After the output end and the negative electrode of the matching control circuit are in a cut-off state, the voltage of the end B of the LED driving circuit starts to rise from the point 0 again, so that the existing LED driving circuit emits light again, and meanwhile, the end A outputs the voltage.
Therefore, the matching control circuit periodically works after being electrified and stops working after being electrified, and the state of the existing LED light-emitting circuit is controlled to periodically change between a light-emitting state and a non-light-emitting state. Such a periodic cycle continues until the ground terminal of the LED driving circuit is connected to the ground.
Therefore, the LED driving circuit with the grounding detection function can not work normally when the LED driving circuit is not connected with a mains supply ground wire, and a flashing phenomenon occurs.
The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.
Claims (10)
1. A ground detection circuit, characterized by: the grounding detection circuit is provided with an input end, an output end and a negative electrode; the input end of the grounding detection circuit is connected with the grounding end of an electric appliance;
the full-bridge rectifier circuit is provided with two alternating current input ends, a positive output end and a negative output end; one alternating current input end is connected with a live wire access end of the electric appliance, the other alternating current input end is connected with a zero line access end of the electric appliance, and the negative electrode of the grounding detection circuit is connected with the negative output end of the full-bridge rectification circuit;
when the grounding end of the electric appliance is connected with the grounding wire of the commercial power or not connected with the grounding wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
2. A ground detection circuit, characterized by: the grounding detection circuit is provided with an input end, an output end and a negative electrode; the input end of the grounding detection circuit is connected with the grounding end of an electric appliance;
the negative electrode of the grounding detection circuit is connected with the negative output end of a full-bridge rectification circuit of the electric appliance;
when the grounding end of the electric appliance is connected with the grounding wire of the commercial power or not connected with the grounding wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
3. The ground detection circuit of claim 2, wherein: when the grounding end of the electric appliance is connected with the ground wire of the commercial power well, the output end of the grounding detection circuit is conducted with the negative electrode; when the grounding end of the electric appliance is not well connected with the ground wire of the mains supply, the output end of the grounding detection circuit is cut off from the negative pole.
4. The ground detection circuit of claim 3, wherein: the grounding detection circuit is connected with the acousto-optic warning circuit.
5. The ground detection circuit of claim 3, wherein: the grounding detection circuit comprises a first diode, a second diode, a first resistor, a second resistor, a first capacitor and a first MOS (metal oxide semiconductor) tube;
the anode of the first diode is the input end of the grounding detection circuit, the cathode of the first diode is connected with one end of a first resistor, the other end of the first resistor, one end of a second resistor, the cathode of the second diode, one end of a first capacitor is connected with the grid electrode of a first MOS tube, and the drain electrode of the first MOS tube is the output end of the grounding detection circuit; the other end of the second resistor, the anode of the second diode, the other end of the first capacitor and the source electrode of the first MOS tube are connected, and the connecting end of the first capacitor is the cathode of the grounding detection circuit.
6. An LED drive circuit having a ground detection function, characterized by comprising: the circuit comprises a grounding detection circuit, a matching control circuit and an LED drive circuit;
the LED driving circuit is provided with a live wire input end, a zero line input end and a grounding end; the input end of the grounding detection circuit is connected with the grounding end of the LED drive circuit, the output end of the grounding detection circuit is connected with the input end of the matching control circuit, the positive electrode of the matching control circuit is connected with the end A of the auxiliary coil of the LED drive circuit, and the control end of the matching control circuit is connected with the end B of the auxiliary coil of the LED drive circuit; the negative electrode of the grounding detection circuit and the negative electrode of the matching control circuit are connected with the negative electrode of the power conversion circuit of the LED drive circuit;
when the grounding end of the LED driving circuit is connected with the ground wire of the commercial power or not connected with the ground wire of the commercial power, different electric signals exist between the output end and the negative electrode of the grounding detection circuit.
7. The LED driving circuit with ground fault detection function according to claim 6, wherein: when the grounding end of the LED driving circuit is connected with the ground wire, the output end of the grounding detection circuit is cut off, the output end and the negative electrode of the matching control circuit are kept in a cut-off state, and the LED driving circuit normally drives the LED lamp to be turned on.
8. The LED driving circuit with ground fault detection function according to claim 6, wherein: when the grounding end of the LED driving circuit is not connected with the ground wire, the output end and the negative electrode of the matching control circuit are periodically switched to be in an off state and an on state, and the LED driving circuit periodically drives the LED lamp to be turned on and off.
9. The LED driving circuit with ground fault detection function according to claim 8, wherein: the matching control circuit comprises a third diode, a fourth diode, a third resistor, a fourth resistor, a fifth resistor, a second capacitor and a second MOS (metal oxide semiconductor) tube;
the positive pole of third diode does match control circuit's positive pole, and the negative pole of third diode and the one end of third resistance are connected, and the other end of third resistance and the one end of fourth resistance, the negative pole of fourth diode, the positive pole of second electric capacity is connected, the other end of fourth resistance, and the one end of fifth resistance and the grid of second MOS pipe are connected, and its link does match control circuit's input, the drain electrode of second MOS pipe does match control circuit's output, the positive pole of fourth diode, the negative pole of second electric capacity, the other end of fifth resistance and the source electrode of second MOS pipe are connected, and its link does match control circuit's negative pole.
10. The LED driving circuit with ground fault detection function according to claim 9, wherein: the third diode is a rectifier diode, the fourth diode is a voltage stabilizing diode, and the second capacitor is an electrolytic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022155804.2U CN212727504U (en) | 2020-09-27 | 2020-09-27 | Ground detection circuit and LED drive circuit with ground detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022155804.2U CN212727504U (en) | 2020-09-27 | 2020-09-27 | Ground detection circuit and LED drive circuit with ground detection function |
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| Publication Number | Publication Date |
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| CN212727504U true CN212727504U (en) | 2021-03-16 |
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| CN202022155804.2U Active CN212727504U (en) | 2020-09-27 | 2020-09-27 | Ground detection circuit and LED drive circuit with ground detection function |
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Effective date of registration: 20210324 Address after: No. 88 Houxiang Road, Xinyang Industrial Park, Haicang District, Xiamen City, Fujian Province, 361000 Patentee after: XIAMEN YANKON ENERGETIC LIGHTING Co.,Ltd. Address before: No.88 HouXiang Road, Haicang District, Xiamen City, Fujian Province Patentee before: Xiamen sunshine IOT Technology Co.,Ltd. |
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