CN213689906U - Wiring circuit double-circuit detection circuitry - Google Patents
Wiring circuit double-circuit detection circuitry Download PDFInfo
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- CN213689906U CN213689906U CN202022763769.2U CN202022763769U CN213689906U CN 213689906 U CN213689906 U CN 213689906U CN 202022763769 U CN202022763769 U CN 202022763769U CN 213689906 U CN213689906 U CN 213689906U
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Abstract
The utility model relates to a detection circuitry technical field discloses a wiring circuit double-circuit detection circuitry, and it includes that insulating impedance keeps apart electric capacity CX4, insulating impedance keeps apart electric capacity CX5, pull-up resistance RL, pull-up resistance RN and detection chip U3. After the circuit board to be detected is electrified, a live line L and a zero line N of an alternating current output end of the circuit board to be detected are respectively connected with the EMC filtering module, and then a point L1 and a point N1 are respectively taken on the live line L and the zero line N; the L1 point is connected in series with the insulation resistance isolation capacitor CX4 and the pull-up resistor RL, and then connected to the first AD input point of the detection chip U3. The N1 point is connected in series with the isolation capacitor CX5 and the pull-up resistor RN, and then connected to the second AD input point of the detection chip U3. The utility model discloses a detect chip U3 and detect the high-low level of L1, N1 input alone, judge whether live wire L and zero line N connect conversely, whether zero line N ground connection. The detection is safe, stable and accurate on the whole, and the circuit is simple.
Description
Technical Field
The utility model belongs to the technical field of the circuit detection technique and specifically relates to a wiring circuit double-circuit detection circuitry.
Background
In ac applications, such as an ac charging post, it is possible for a worker to reverse the connection of the neutral and live lines, or for the neutral line to be ungrounded, when installing the distribution-related devices. For example, in an ac application having only a 1P circuit breaker, since there is no switch control on the live wire, if a worker mistakenly accesses the zero wire as the live wire into the circuit breaker at this time, the terminal charging pile and the like are still electrified after the power-off operation, which may endanger the life of the worker. However, at this moment, the worker does not know that the devices such as the terminal charging pile are electrified instead of connecting the zero line with the live wire. Whether the zero line is grounded or not is not easy to detect. Therefore, it is an urgent technical problem to provide a circuit capable of detecting whether the zero line and the live line are reversely connected and whether the zero line is grounded.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wiring circuit double-circuit detection circuitry, through the independent detection to live wire L, zero line N, whether live wire L and zero line N that detect out in the circuit board that can be accurate connect anti-, whether the zero line ground connection. The detection circuit is safe and stable on the whole and simple.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model discloses a wiring circuit double-circuit detection circuitry, it includes insulating impedance isolation electric capacity CX4, insulating impedance isolation electric capacity CX5, pull-up resistance RL, pull-up resistance RN and detection chip U3. After the circuit board to be detected is electrified, a live line L and a zero line N of an alternating current output end of the circuit board to be detected are respectively connected with the EMC filtering module, and then a point L1 and a point N1 are respectively taken on the live line L and the zero line N. The L1 point is connected in series with the insulation impedance isolation capacitor CX4 and the pull-up resistor RL, and then is connected with the first AD input point of the detection chip U3. The N1 point is connected in series with the isolation capacitor CX5 and the pull-up resistor RN, and then connected to the second AD input point of the detection chip U3. The detection chip U3 judges whether the live wire L and the zero wire N are reversely connected and whether the zero wire N is grounded by detecting the high and low levels input by the L1 and the N1.
And (3) detecting whether the zero line N of the live line L is connected reversely:
when the detection chip U3 detects that the point L1 is high level, the point N1 is low level; the live line L and the zero line N are correctly connected;
when the detection chip U3 detects that the point L1 is low level, the point N1 is high level; the live line L and the neutral line N are reversed.
And (3) detecting whether the zero line is grounded:
when the detection chip U3 detects that the point L1 is high level, the point N1 is high level; the zero line is not grounded;
when the detection chip U3 detects that the point L1 is at a high level and the point N1 is at a low level of 0V; the neutral wire is already grounded.
Furthermore, an operational amplification follower circuit used for protecting the stable voltage of the single chip microcomputer is connected between the pull-up resistor RL and the pull-up resistor RN and the detection chip U3.
Further, the operational amplification follower circuit includes an operational amplification follower U5, a first filter circuit, and a second filter circuit. The pull-up resistor RL is connected with a first input pin of the operational amplification follower U5, and a first output pin of the operational amplification follower U5 is connected with a first filter circuit and then connected with a first AD input point of the detection chip U3. The pull-up resistor RN is connected with a second input pin of the operational amplification follower U5, and a second output pin of the operational amplification follower U5 is connected with a second filter circuit and then connected with a second AD input point of the detection chip U3.
The voltage stabilizing circuit further comprises a first voltage clamping circuit for protecting the detection chip U3 from stabilizing voltage, wherein one end of the first voltage clamping circuit is connected with the first input pin of the operational amplifier follower U5, and the other end of the first voltage clamping circuit is grounded.
Further, the first voltage clamp circuit includes a diode D4, a diode D21, a diode D22, and a resistor R41; the diode D21 and the diode D22 are connected in series and then are respectively connected with the diode D4 and the resistor R41 in parallel; the cathode of the diode D4, one end of the resistor R41, and the anode of the diode D21 are connected to the first input pin of the operational amplifier follower U5, the cathode of the diode D21 is connected to the anode of the diode D22, the cathode of the diode D22 is connected to the other end of the resistor R41, and the anode of the diode D4 is connected to the PE terminal.
And the voltage stabilizing circuit further comprises a second voltage clamping circuit for protecting the detection chip U3 from stabilizing the voltage, wherein one end of the second voltage clamping circuit is connected with the second input pin of the operational amplifier follower U5, and the other end of the second voltage clamping circuit is grounded.
Further, the second voltage clamp circuit includes a diode D12, a diode D23, a diode D24, and a resistor R52; the diode D23 and the diode D24 are connected in series and then are respectively connected with the diode D12 and the resistor R52 in parallel; the cathode of the diode D12, one end of the resistor R52, and the anode of the diode D23 are connected to the first input pin of the operational amplifier follower U5, the cathode of the diode D23 is connected to the anode of the diode D24, the cathode of the diode D24 is connected to the other end of the resistor R52, and the anode of the diode D12 is connected to the PE terminal.
The utility model discloses an useful part is:
1. the utility model discloses an insulating impedance keeps apart electric capacity CX4, insulating impedance keeps apart electric capacity CX5 and inserts live wire, zero line mutual independence into detection circuitry respectively, through pull-up resistance RL, pull-up resistance RN to by live wire, zero line incoming signal sampling; finally, the sampled signals are detected by using the detection chip U3, so that whether the zero line and the live line are reversely connected or not and whether the zero line is grounded or not can be simultaneously determined according to the detection result of the detection chip U3, and then field workers can be reminded to rework and correct, and potential safety hazards to the field workers or users are avoided.
2. The utility model discloses set up insulating impedance at live wire and zero line and detection circuitry tie point and keep apart electric capacity CX4, insulating impedance and keep apart electric capacity CX5, carry out the alternating current-direct current and keep apart, make live wire and zero line end pair PE's insulating impedance enough satisfy the requirement of ann's rule national standard greatly, after ann's rule electric capacity became invalid, can not lead to being punctured to can ensure personal safety.
3. The utility model discloses still set up first voltage clamp circuit, second voltage clamp circuit and operational amplification follower circuit on pull-up resistance and detection chip U3 and eliminated, the fortune is put and is followed the isolation high pressure, and protection detection chip U3 is not damaged for detect chip U3 can be safe and reliable more.
Drawings
Fig. 1 is a schematic circuit diagram of a circuit board to be tested.
Fig. 2 is a detection circuit diagram according to the first embodiment.
Fig. 3 is a detection circuit diagram of the second embodiment.
Description of the main component symbols:
1. EMC filter module, 2, first voltage clamp circuit, 3, second voltage clamp circuit, 4, operational amplification follower circuit, 41, first filter circuit, 42, second filter circuit.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, the utility model discloses a wiring circuit double-circuit detection circuit, it includes insulating impedance isolation electric capacity CX4, insulating impedance isolation electric capacity CX5, pull-up resistance RL, pull-up resistance RN and detection chip U3. After the circuit board to be detected is electrified, a live line L and a zero line N of an alternating current output end of the circuit board to be detected are respectively connected with the EMC filtering module 1, and then a point L1 and a point N1 are respectively taken on the live line L and the zero line N.
The L1 point is connected in series with the insulation impedance isolation capacitor CX4 and the pull-up resistor RL and then connected with the PIN20 of the first input PIN of the detection chip U3. The N1 point is connected with the insulation impedance isolation capacitor CX5 and the pull-up resistor RN in series and then is connected with the PIN3 of the second input PIN PIN of the detection chip U3.
The pull-up resistor RL is formed by connecting a resistor R28, a resistor R29, a resistor R30 and a resistor R31 in series.
The pull-up resistor RN is formed by connecting a resistor R48, a resistor R49, a resistor R50 and a resistor R51 in series.
The detection chip U3 judges whether the live wire L and the zero wire N are reversely connected and whether the zero wire N is grounded by detecting the high and low levels input by the L1 and the N1.
And (3) detecting whether the zero line N of the live line L is connected reversely:
when the detection chip U3 detects that the point L1 is high level, the point N1 is low level; the live line L and the zero line N are correctly connected;
when the detection chip U3 detects that the point L1 is low level, the point N1 is high level; the live line L and the neutral line N are reversed.
And (3) detecting whether the zero line is grounded:
when the detection chip U3 detects that the point L1 is high level, the point N1 is high level; the zero line is not grounded;
when the detection chip U3 detects that the point L1 is at a high level and the point N1 is at a low level of 0V; the neutral wire is already grounded.
Example two:
as shown in fig. 1 and fig. 3, the utility model discloses a wiring circuit double-circuit detection circuit, it includes insulating impedance isolation electric capacity CX4, insulating impedance isolation electric capacity CX5, pull-up resistance RL, pull-up resistance RN, first voltage clamp circuit 2, second voltage clamp circuit 3, operation amplification follower circuit 4 and detection chip U3.
The pull-up resistor RL is formed by connecting a resistor R28, a resistor R29, a resistor R30 and a resistor R31 in series.
The pull-up resistor RN is formed by connecting a resistor R48, a resistor R49, a resistor R50 and a resistor R51 in series.
The operational amplification follower circuit 4 includes an operational amplification follower U5, a first filter circuit 41, and a second filter circuit 42. The first filter circuit 41 is composed of a resistor R43, an inductor L5, a capacitor C15 and a resistor R26, and the second filter circuit 42 is composed of a resistor R55, an inductor L4, a capacitor C25 and a resistor R27.
After the circuit board to be detected is electrified, a live line L and a zero line N of an alternating current output end of the circuit board to be detected are respectively connected with the EMC filtering module 1, and then a point L1 and a point N1 are respectively taken on the live line L and the zero line N.
The L1 point is connected IN series with the insulation impedance isolation capacitor CX4 and the pull-up resistor RL, then connected with the + IN1 PIN of the operational amplification follower U5, output from the OUT4 PIN of the operational amplification follower U5, connected with the first filter circuit 41, and then connected with the PIN20 PIN of the detection chip U3.
The N1 point is connected with an insulation impedance isolation capacitor CX5 and a pull-up resistor RN IN series and then connected with a PIN + IN2 of the operational amplification follower U5, and is output from an OUT3 PIN of the operational amplification follower U5, connected with a second filter circuit 42 and then connected with a PIN2 PIN of a detection chip U3.
The + IN1 pin of the operational amplifier follower U5 is also connected with a first voltage clamp circuit 2 for absorbing spike voltage and stabilizing the sampling waveform of the live wire. The first voltage clamp circuit 2 includes a diode D4, a diode D21, a diode D22, and a resistor R41. The diode D21 and the diode D22 are connected in series and then are respectively connected with the diode D4 and the resistor R41 in parallel; the cathode of the diode D4, one end of the resistor R41, and the anode of the diode D21 are connected to the first input pin of the operational amplifier follower U5, the cathode of the diode D21 is connected to the anode of the diode D22, the cathode of the diode D22 is connected to the other end of the resistor R41, and the anode of the diode D4 is connected to the PE terminal.
And the + IN2 pin of the operational amplification follower U5 is also connected with a second voltage clamping circuit 3 for absorbing spike voltage and stabilizing the zero line sampling waveform. The second voltage clamp circuit 3 includes a diode D12, a diode D23, a diode D24, and a resistor R52; the diode D23 and the diode D24 are connected in series and then are respectively connected with the diode D12 and the resistor R52 in parallel; the cathode of the diode D12, one end of the resistor R52, and the anode of the diode D23 are connected to the first input pin of the operational amplifier follower U5, the cathode of the diode D23 is connected to the anode of the diode D24, the cathode of the diode D24 is connected to the other end of the resistor R52, and the anode of the diode D12 is connected to the PE terminal.
Other features are consistent with the embodiments.
To sum up, the utility model discloses a to live wire L, zero line N's individual detection, whether live wire L and zero line N that detect out in the circuit board that can be accurate connect conversely, whether the input of circuit board is ground connection. The whole is safe and stable, and the circuit is simple.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (7)
1. A wiring line two-way detection circuit is characterized in that: the detection circuit comprises an insulation impedance isolation capacitor CX4, an insulation impedance isolation capacitor CX5, a pull-up resistor RL, a pull-up resistor RN and a detection chip U3;
one end of the insulation impedance isolation capacitor CX4 is connected with the live wire L, and the other end of the insulation impedance isolation capacitor CX4 is connected with the pull-up resistor RL in series and then is connected with a first AD input point of the detection chip U3;
and one end of the insulation impedance isolation capacitor CX5 is connected with the zero line N, and the other end of the insulation impedance isolation capacitor CX5 is connected with the second AD input point of the detection chip U3 after being connected with the pull-up resistor RN in series.
2. The circuit for two-way detection of a wiring line according to claim 1, characterized in that: and an operational amplification follower circuit for protecting the stable voltage of the single chip microcomputer is also connected between the pull-up resistor RL and the pull-up resistor RN and the detection chip U3.
3. The circuit for two-way detection of a wiring line according to claim 2, characterized in that: the operational amplification follower circuit comprises an operational amplification follower U5, a first filter circuit and a second filter circuit;
the pull-up resistor RL is connected with a first input pin of the operational amplification follower U5, and a first output pin of the operational amplification follower U5 is connected with a first filter circuit and then connected with a first AD input point of the detection chip U3;
the pull-up resistor RN is connected with a second input pin of the operational amplification follower U5, and a second output pin of the operational amplification follower U5 is connected with a second filter circuit and then connected with a second AD input point of the detection chip U3.
4. The circuit for two-way detection of a wiring line according to claim 2, characterized in that: the voltage stabilizing circuit further comprises a first voltage clamping circuit for protecting the detection chip U3 to stabilize voltage, wherein one end of the first voltage clamping circuit is connected with the first input pin of the operational amplification follower U5, and the other end of the first voltage clamping circuit is grounded.
5. The circuit according to claim 4, wherein: the first voltage clamp circuit comprises a diode D4, a diode D21, a diode D22, and a resistor R41; the diode D21 and the diode D22 are connected in series and then are respectively connected with the diode D4 and the resistor R41 in parallel; the cathode of the diode D4, one end of the resistor R41, and the anode of the diode D21 are connected to the first input pin of the operational amplifier follower U5, the cathode of the diode D21 is connected to the anode of the diode D22, the cathode of the diode D22 is connected to the other end of the resistor R41, and the anode of the diode D4 is connected to the PE terminal.
6. The circuit for two-way detection of a wiring line according to claim 2, characterized in that: the voltage stabilizing circuit further comprises a second voltage clamping circuit for protecting the detection chip U3 to stabilize voltage, wherein one end of the second voltage clamping circuit is connected with the second input pin of the operational amplification follower U5, and the other end of the second voltage clamping circuit is grounded.
7. The circuit for two-way detection of a patch cord according to claim 6, wherein: the second voltage clamp circuit comprises a diode D12, a diode D23, a diode D24, and a resistor R52; the diode D23 and the diode D24 are connected in series and then are respectively connected with the diode D12 and the resistor R52 in parallel; the cathode of the diode D12, one end of the resistor R52, and the anode of the diode D23 are connected to the first input pin of the operational amplifier follower U5, the cathode of the diode D23 is connected to the anode of the diode D24, the cathode of the diode D24 is connected to the other end of the resistor R52, and the anode of the diode D12 is connected to the PE terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022763769.2U CN213689906U (en) | 2020-11-25 | 2020-11-25 | Wiring circuit double-circuit detection circuitry |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022763769.2U CN213689906U (en) | 2020-11-25 | 2020-11-25 | Wiring circuit double-circuit detection circuitry |
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| CN213689906U true CN213689906U (en) | 2021-07-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002505A (en) * | 2021-10-29 | 2022-02-01 | 广东浦尔顿科技有限公司 | Charging pile grounding detection method and system |
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2020
- 2020-11-25 CN CN202022763769.2U patent/CN213689906U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002505A (en) * | 2021-10-29 | 2022-02-01 | 广东浦尔顿科技有限公司 | Charging pile grounding detection method and system |
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