CN210626637U - Electric leakage detection circuit with fault detection function for intelligent electric product - Google Patents
Electric leakage detection circuit with fault detection function for intelligent electric product Download PDFInfo
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- CN210626637U CN210626637U CN202020398586.2U CN202020398586U CN210626637U CN 210626637 U CN210626637 U CN 210626637U CN 202020398586 U CN202020398586 U CN 202020398586U CN 210626637 U CN210626637 U CN 210626637U
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Abstract
The utility model discloses an electric leakage detection circuit that wisdom consumer tape fault detected, including chip U5C, triode Q3 and resistance R67, chip U5C's foot 5 connecting resistance R65, resistance R65's other end connecting resistance R69, triode Q3's projecting pole, triode Q3's collecting electrode passes through resistance R66 connecting voltage AVDD, and triode Q3's base passes through resistance R68 connection control signal CTRL, chip U5C's foot 6 connecting resistance R71 and resistance R74, the utility model discloses in the actual field application process, judgement that can be very fast is that external equipment trouble (electric leakage mutual-inductor damages or virtual joint) still electric leakage detection circuit goes wrong.
Description
Technical Field
The utility model relates to a detect technical field, specifically a wisdom consumer takes fault detection's electric leakage detection circuit.
Background
The leakage current in the safe power utilization online detection product is obtained by converting a current signal into a voltage signal through a sampling resistor, amplifying the voltage signal by an operational amplifier, entering an AD collector of the MCU, and calculating the leakage current value of the acquired data through algorithms such as filtering and the like. When the current transformer is not connected with the leakage current and the leakage current is zero (connected with the transformer), the voltage on the sampling resistor is zero, so that whether the transformer is installed or not can not be distinguished.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wisdom consumer electric product takes fault detection's electric leakage detection circuit to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a leakage detection circuit with fault detection for an intelligent electric product comprises a chip U5C, a triode Q3 and a resistor R67, wherein a pin 5 of the chip U5C is connected with a resistor R65, the other end of the resistor R65 is connected with a resistor R69 and an emitter of the triode Q3, a collector of the triode Q3 is connected with a voltage AVDD through a resistor R66, a base of the triode Q3 is connected with a control signal CTRL through a resistor R68, a pin 6 of the chip U5C is connected with a resistor R71 and a resistor R74, the other end of the resistor R71 is connected with two ends of a resistor R66, the other end of the resistor R74 is connected with a resistor R67 and a resistor R70, the other end of the resistor R70 is connected with a pin 7 of the chip U5C, the other end of the resistor R67 is connected with a capacitor C29 and an AD acquisition end of an MCU, and.
As a further aspect of the present invention: the model of the chip U5C is TLC2272 DR.
As a further aspect of the present invention: the voltage AVDD is 3.3V direct current.
As a further aspect of the present invention: the transistor Q3 is an NPN transistor.
As a further aspect of the present invention: and two ends of the resistor R69 are also connected with a voltage stabilizing diode.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses at the actual site application in-process, the judgement that can be very fast is that external equipment trouble (electric leakage mutual-inductor damages or virtual connecing) is still that electric leakage detection circuitry goes wrong.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, embodiment 1: the embodiment of the utility model provides an in, wisdom consumer area fault detection's electric leakage detection circuit, including chip U5C, triode Q3 and resistance R67, chip U5C's foot 5 connecting resistance R65, resistance R65's other end connecting resistance R69, triode Q3's projecting pole, triode Q3's collecting electrode passes through resistance R66 connecting voltage AVDD, triode Q3's base passes through resistance R68 and connects control signal CTRL, chip U5C's foot 6 connecting resistance R71 and resistance R74, resistance R71's other end connecting resistance R66's both ends, resistance R74's other end connecting resistance R67 and resistance R70, chip U5C's foot 7 is connected to resistance R70's the other end, electric capacity C29 and MCU's AD collection end is connected to resistance R67's the other end, resistance R69's both ends connect in parallel have current transformer.
In the presence of leakage: and the leakage current is converted into a voltage signal through a resistor R69, amplified by an operational amplifier and then enters the MCU for AD acquisition, and the leakage current value is calculated through an algorithm after the AD value is read. When the line has no leakage or the leakage transformer is not installed or damaged, the voltage on the resistor is zero, and the detected leakage value is also zero. In order to distinguish what causes the leakage is zero, the leakage fault detection mechanism is added, 3.3V is added to the resistor by an IO port control triode Q3, if the transformer is installed and is not damaged, the voltage drop on the resistor R69 is small, otherwise, the voltage drop is large. When the transistor Q3 is conducted, if the current leakage value detected by the transformer is not larger than 3993MA, if the current leakage value detected by the transformer with short circuit is smaller than 2720, if the current leakage value detected by the transformer normally is between 2721 and 3992.
Example 2: on the basis of example 1, the chip U5C is of type TLC2272 DR. The voltage AVDD is 3.3V direct current. The transistor Q3 is an NPN transistor. The two ends of the resistor R69 are also connected with a voltage stabilizing diode.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A leakage detection circuit with fault detection for an intelligent electric product comprises a chip U5C, a triode Q3 and a resistor R67, and is characterized in that a pin 5 of the chip U5C is connected with a resistor R65, the other end of the resistor R65 is connected with a resistor R69 and an emitter of a triode Q3, a collector of the triode Q3 is connected with a voltage AVDD through a resistor R66, a base of the triode Q3 is connected with a control signal CTRL through a resistor R68, a pin 6 of the chip U5C is connected with a resistor R71 and a resistor R74, the other end of the resistor R71 is connected with two ends of a resistor R66, the other end of the resistor R74 is connected with a resistor R67 and a resistor R70, the other end of the resistor R70 is connected with a pin 7 of the chip U5C, the other end of the resistor R67 is connected with a capacitor C29 and an AD acquisition end of an MCU, and.
2. The circuit of claim 1, wherein the chip U5C is TLC2272 DR.
3. The leakage detection circuit with fault detection for intelligent electric products according to claim 1, wherein the voltage AVDD is 3.3V dc.
4. The leakage detection circuit with fault detection for intelligent electric product of claim 1, wherein said transistor Q3 is NPN transistor.
5. The leakage detection circuit with fault detection for intelligent electric products of claim 4, wherein a zener diode is further connected to two ends of the resistor R69.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202020398586.2U CN210626637U (en) | 2020-03-25 | 2020-03-25 | Electric leakage detection circuit with fault detection function for intelligent electric product |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN202020398586.2U CN210626637U (en) | 2020-03-25 | 2020-03-25 | Electric leakage detection circuit with fault detection function for intelligent electric product |
Publications (1)
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CN210626637U true CN210626637U (en) | 2020-05-26 |
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Family Applications (1)
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CN202020398586.2U Expired - Fee Related CN210626637U (en) | 2020-03-25 | 2020-03-25 | Electric leakage detection circuit with fault detection function for intelligent electric product |
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CN (1) | CN210626637U (en) |
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2020
- 2020-03-25 CN CN202020398586.2U patent/CN210626637U/en not_active Expired - Fee Related
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CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200526 Termination date: 20210325 |
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CF01 | Termination of patent right due to non-payment of annual fee |