CN214013869U - Reliable single-phase wiring detection circuit of commercial power - Google Patents
Reliable single-phase wiring detection circuit of commercial power Download PDFInfo
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- CN214013869U CN214013869U CN202023345037.8U CN202023345037U CN214013869U CN 214013869 U CN214013869 U CN 214013869U CN 202023345037 U CN202023345037 U CN 202023345037U CN 214013869 U CN214013869 U CN 214013869U
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Abstract
The application relates to a reliable mains supply single-phase connection detection circuit, which comprises a mains supply live wire end INPUT-L, a mains supply null wire end INPUT-N and a ground wire end INPUT-PE, wherein a first diode D1, a first resistor R1 and a capacitor C1 are connected in series between the mains supply live wire end INPUT-L and the ground wire end INPUT-PE, the conduction direction of the first diode D1 is from the mains supply live wire end INPUT-L to the ground wire end INPUT-PE, and the mains supply null wire end INPUT-N is grounded; the direct current input type optocoupler U1 is connected in parallel with two ends of the first diode D1, the conduction direction of the first diode D1 is opposite to the conduction direction of a light emitter of the optocoupler U1, a sensing module is coupled with a light receiver of the optocoupler U1 and comprises an external power supply connected to one end of the light receiver of the optocoupler U1, the other end of the light receiver of the optocoupler U1 is grounded, a second resistor R2 is connected between the light receiver of the optocoupler U1 and the external power supply, and a first detection end GND-DE is led out between the second resistor R2 and the light receiver of the optocoupler U1. This application has the effect of being convenient for listen the commercial power wiring whether have the mistake.
Description
Technical Field
The application relates to the technical field of commercial power wiring detection, in particular to a reliable commercial power single-phase wiring detection circuit.
Background
Ups (uninterruptible Power supply), i.e., an uninterruptible Power supply, is widely used for supplying Power to medical equipment, office computers, machine room IT equipment, home televisions, and other equipment. The UPS is connected to the mains supply to supply power to the equipment, and if the mains supply is connected in a wrong mode, the equipment can be damaged, and personal safety is endangered. In order to effectively ensure the electricity utilization safety of the equipment and reduce life safety accidents, a line for detecting the wiring state of the commercial power is needed.
SUMMERY OF THE UTILITY MODEL
In order to facilitate detecting whether the commercial power wiring has the mistake, the application provides a reliable single-phase wiring detection circuit of commercial power.
The application provides a reliable single-phase wiring detection circuit of commercial power adopts following technical scheme:
a reliable mains supply single-phase wiring detection circuit comprises a mains supply live wire end INPUT-L, a mains supply live wire end INPUT-N and a ground wire end INPUT-PE, wherein a first diode D1, a first resistor R1 and a capacitor C1 are connected in series between the mains supply live wire end INPUT-L and the ground wire end INPUT-PE, the conducting direction of the first diode D1 is from the mains supply live wire end INPUT-L to the ground wire end INPUT-PE, and the mains supply live wire end INPUT-N is grounded; the direct current input type optocoupler U1 is connected in parallel with two ends of the first diode D1, the conduction direction of the first diode D1 is opposite to the conduction direction of a light emitter of the optocoupler U1, a sensing module is coupled with a light receiver of the optocoupler U1 and comprises an external power supply connected to one end of the light receiver of the optocoupler U1, the other end of the light receiver of the optocoupler U1 is grounded, a second resistor R2 is connected between the light receiver of the optocoupler U1 and the external power supply, and a first detection end GND-DE is led out between the second resistor R2 and the light receiver of the optocoupler U1.
By adopting the technical scheme, in the positive half cycle of the commercial power, the commercial power forms a loop through the commercial power live wire end INPUT-L → the first diode D1 → the first resistor R1 → the capacitor C1 → the ground wire end INPUT-PE → the commercial power zero wire end INPUT-N, the optocoupler U1 is cut off, the first detection end GND-DE detects that the loop is at a high level, the capacitor C1 is charged, in the negative half cycle of the commercial power, the capacitor C1 discharges to enable the optocoupler U1 to be conducted, the loop is detected as a low level at the first detection end GND-DE, the high-low level conversion which is the same as the period of the commercial power is detected at the first detection end GND-DE, the commercial power is normally connected, and if the first detection end GND-DE is always at the high level, the commercial power is wrongly connected, so that whether the commercial power is correctly connected is detected.
Preferably, a second diode D2 is coupled to one end of the light emitter of the optical coupler U1, a branch formed by the second diode D2 and the light emitter of the optical coupler U1 is connected in parallel with the first diode D1, and the conduction direction of the second diode D2 is the same as the conduction direction of the light emitter of the optical coupler U1.
Through adopting above-mentioned technical scheme, in the positive half cycle of commercial power, second diode D2 ends, has the partial pressure, reduces the voltage and punctures the condition that opto-coupler U1 and lead to opto-coupler U1 to damage.
Preferably, the optocoupler U1 is of a triode output type, and a collector of the optical receiver of the optocoupler U1 is connected to the second resistor R2 and an emitter thereof is grounded.
By adopting the technical scheme, when the light emitter of the optocoupler U1 is conducted, the light receiver is conducted by the triode output type optocoupler U1, so that the first detection end GND-DE is grounded, and the output of the first detection end GND-DE is low level.
Preferably, a test branch is connected between the ground wire end INPUT-PE and the first capacitor, the test branch comprises a mains supply zero line reference potential GND connected with the mains supply zero line end INPUT-N, a third diode D3 and a voltage division module are sequentially connected between the ground wire end INPUT-PE and the mains supply zero line reference potential GND, and a second detection end LN-DE is arranged between the voltage division modules.
By adopting the technical scheme, when no grounding wire or zero line is reversely connected, the voltage division module divides the voltage accessed by the commercial power zero line end INPUT-N, and the wiring condition of the commercial power can be judged according to the voltage division condition of the second detection end LN-DE.
Preferably, the voltage division module is a third resistor R3 and a fourth resistor R4 which are sequentially connected between one end of the third diode D3, which is far away from the ground terminal INPUT-PE, and the reference potential GND of the neutral line of the commercial power, the resistance value of the third resistor R3 is far greater than that of the first resistor R1, and the second detection terminal LN-DE is led out from between the third resistor R3 and the fourth resistor R4.
By adopting the technical scheme, when no ground wire exists, a loop is formed between an electric supply live wire end INPUT-L → the first diode D1 → the first resistor R1 → the capacitor C1 → the third diode D3 → the third resistor R3 → the fourth resistor R4 → the electric supply zero line reference potential GND, because the third resistor R3 is far larger than the first resistor R1, the voltage division of the capacitor C1 is small, so that the electric quantity stored in the capacitor C1 is small in the positive half period of the electric supply, and the electric energy stored in the capacitor C1 is not enough to conduct the optocoupler U1 in the negative half period of the electric supply, namely the output of the first detection end GND-DE is high level, and no voltage is detected by the second detection end LN-DE; when the zero line and the live line are reversely connected, the first detection end GND-DE is at a high level, and the second detection end LN-DE detects voltage; the mains supply wiring is normal, when the zero-earth voltage is overhigh, the first detection end GND-DE outputs continuously-converted high and low levels, the second detection end LN-DE has voltage, and the wiring condition of the mains supply can be judged by judging whether the first detection end GND-DE and the second detection end LN-DE have voltage or not
Preferably, the third resistor R3 has a value of 6200K Ω, and the first resistor R1 has a value of 100K Ω.
By adopting the technical scheme, the voltage division is realized by the matching of the third resistor R3 and the first resistor R1 in the proportion.
Preferably, the capacitance value of the capacitor C1 is 10NF/275VAC, and the specification of the optocoupler U1 is NEC 2561.
By adopting the technical scheme, the capacitance value of the capacitor C1 is 10NF/275VAC, the specification of the optocoupler U1 is NEC2561, the resistance values of the capacitor C3578, the third resistor R3 and the first resistor R1 are matched to enable parameter change in the circuit to be in a detectable range, and the parameter change is convenient to detect.
Drawings
Fig. 1 is a circuit diagram of a reliable single-phase commercial power connection detection circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a reliable single-phase mains connection detection circuit according to another embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses reliable single-phase wiring detection circuit of commercial power. Referring to fig. 1, the reliable commercial power single-phase connection detection circuit comprises a commercial power live wire terminal INPUT-L, a commercial power null wire terminal INPUT-N and a ground wire terminal INPUT-PE, a first diode D1, a first resistor R1 and a capacitor C1 are connected between the commercial power line terminal INPUT-L and the ground line terminal INPUT-PE in sequence, and the first diode D1 is turned on from the main line terminal INPUT-L to the ground terminal INPUT-PE, both ends at first diode D1 are parallelly connected with opto-coupler U1 and second diode D2, opto-coupler U1 is direct current input type, triode output type, the direction of switch-on of opto-coupler U1 and second diode D2 all is opposite with the direction of switch-on of first diode D1, the illuminator and the second diode D2 of opto-coupler U1 are established ties, the photic ware of opto-coupler U1 is connected with sensing module, sensing module is connected with external power supply, be equipped with first sense terminal GND-DE between external power supply and the photic ware.
In this embodiment, the sensing module includes a second resistor R2, the light receiver is an NPN-type transistor, the external power supply is 5V, the second resistor R2 is connected between the collector of the light receiver and the external power supply, the emitter of the light receiver is grounded, and the first detection terminal GND-DE is connected between the collector of the light receiver and the second resistor R2.
In this embodiment, the loop mains supply live wire end INPUT-L → the first diode D1 → the first resistor R1 → the capacitor C1 → the ground wire end INPUT-PE → the mains supply zero line end INPUT-N is defined as a detection circuit, when the circuit is implemented, when a mains supply is connected, and the zero live wire and the ground wire are normally connected, the capacitor C1 is charged through the detection circuit in the positive half cycle of the mains supply, the capacitor C1 stores energy, the optocoupler U1 is not connected, and then the first detection end GND-DE is at a high level; when the negative half cycle of the commercial power passes through the detection circuit, the capacitor C1 discharges, the current direction is ground wire end INPUT-PE → commercial power zero line end INPUT-N → the capacitor C1 → the first resistor R1 → the optical coupler U1 → the second diode D2 → commercial power live wire end INPUT-L, at the moment, the optical coupler U1 is conducted, the first detection end GND-DE is low level 0V, the normal wiring of the ground wire and the zero live wire can be judged by detecting the high and low level of the cycle change of the first detection end GND-DE at 50HZ/60HZ, and when the detection circuit is matched with the UPS, the detection signal of the first detection end GND-DE is transmitted to the UPS along with the pulse wave of the high and low level switched by the positive and negative half cycles of the commercial power.
When the ground wire end INPUT-PE is not connected to the ground, a loop cannot be formed between the mains supply live wire end INPUT-L and the ground wire end INPUT-PE, and then the capacitor C1 cannot be charged in the positive half period of the mains supply, so that the optocoupler U1 is not provided with enough voltage in the negative half period of the mains supply to be conducted, the first detection end GND-DE is always at a high level at the moment, and the UPS can be shut down and give an alarm after receiving a continuous high-level signal of the first detection end GND-DE.
And if the zero line and the live line are reversely connected, because the potential difference between the zero line and the ground line is small, the electric quantity stored in the first capacitor is small, and the optocoupler U1 cannot be conducted, so that the first detection end GND-DE is also at a high level, and in actual use, the first detection end GND-DE is detected as the high level, and then the commercial power wiring error can be judged.
Referring to fig. 2, in another embodiment, one end of the capacitor C1, which is away from the first resistor R1, is connected to a test branch, one end of the test branch, which is away from the capacitor C1, is a reference potential GND of a neutral line of a utility power, and is connected to a neutral line of the utility power INPUT-N, a third diode D3 and a voltage dividing module are sequentially connected between the capacitor C1 and the reference potential GND of the neutral line of the utility power, a conducting direction of the third diode D3 is a direction from the capacitor C1 to the reference potential GND of the neutral line of the utility power, a second detection end LN-DE is led out from the voltage dividing module, when the line of the utility power is normal, the first detection end GND-DE is a high-low level of a periodic change of 50HZ/60HZ, and the second detection end detects no voltage.
When the zero line and the live line are reversely connected, the commercial power zero line reference potential GND is connected with the commercial power zero line end INPUT-N, so that the commercial power zero line reference potential GND is connected with live line voltage, when the commercial power current direction is opposite to the conduction direction of the third diode D3, the third diode D3 is cut off, and the second detection end LN-DE has no voltage; when the ground wire is not connected, the second detection terminal LN-DE has voltage under the partial pressure of the partial pressure module.
The voltage division module comprises a third resistor R3 and a fourth resistor R4 which are sequentially connected between a third diode D3 and a commercial power zero line reference potential GND, one end, far away from the third resistor R3, of the fourth resistor R4 is connected with the commercial power zero line reference potential GND, a second detection end LN-DE is led out between the third resistor R3 and the fourth resistor R4, the resistance value of the third resistor R3 is far larger than that of the first resistor R1, specifically, the resistance value of the third resistor R3 is 6200K omega, the resistance value of the first resistor R1 is 100K omega, the fourth resistor R4 is 75K omega, the capacitance value of the capacitor C1 is 10NF/275VAC, and the specification of the optocoupler U1 is NEC 2561.
When the circuit of the present embodiment is connected to the commercial power, if the circuit is not connected to the ground line, a loop is formed between the live line terminal INPUT-L of the commercial power → the first diode D1 → the first resistor R1 → the capacitor C1 → the third diode D3 → the third resistor R3 → the fourth resistor R4 → the reference potential GND of the commercial power zero line in the positive half cycle of the commercial power, and the commercial power is rectified by the first diode D1 and the third diode D3 to rectify the commercial power to generate the reference potential GND of the commercial power zero line
The capacitor C1 is charged, in a half cycle of a mains supply, the energy stored in the capacitor C1 is less and is not enough to drive the optocoupler U1 to be conducted, the capacitor C1 is equivalent to a large resistor in a loop, and the voltage value detected by the second detection end LN-DE is small and is ignored; in the negative half cycle of the utility power, the first diode D1 and the third diode D3 are cut off; the first detection terminal GND-DE is always at a high level, and the second detection terminal LN-DE has no voltage, and can be determined as a non-grounded line.
When the circuit of the embodiment is connected with a mains supply, the ground wire is normally connected, and when the zero line and the live line are reversely connected, the neutral line end INPUT-N of the mains supply is connected with the live line, the test branch and the ground line end INPUT-PE form a loop, the 220V mains supply is rapidly divided into partial voltages through the third diode D3, the third resistor R3 and the fourth resistor R4, so that the second detection end LN-DE has voltage, and because the zero line and the live line are reversely connected, when the negative half period of the mains supply is in a negative half period, the voltage is divided by the branch: a loop is formed between the commercial power live wire end INPUT-L → the first diode D1 → the first resistor R1 → the capacitor C1 and the ground wire end INPUT-PE, the commercial power live wire end INPUT-L is connected into the zero line, because the potential difference between the zero line and the ground wire is small, the electric energy stored in the capacitor C1 is small and can be ignored, so that the optocoupler U1 is not conducted, the first detection end GND-DE is at a high level, and when the first detection end GND-DE is at a high level and the second detection end LN-DE has voltage, the reverse connection of the zero live wire is represented.
When the circuit of the embodiment is connected with commercial power and the zero line and ground wire connection is normal, if the zero voltage and ground voltage are too high, the zero line voltage is connected with the reference potential GND of the commercial power zero line, the zero line voltage is quickly divided by the third diode D3, the third resistor R3 and the fourth resistor R4, so that the second detection end LN-DE has voltage, because the zero line and ground wire connection is normal, in the positive half period of the commercial power, the capacitor C1 is charged, the capacitor C1 discharges in the negative half period of the mains supply, the current direction is the same as the conduction direction of the second diode D2, the optocoupler U1 is conducted, the light receiver is conducted to enable the first detection end GND-DE to be grounded, therefore, the first detection end GND-DE detects high and low levels, the conduction time of the optical coupler U1 is shorter, when the first detection end GND-DE outputs high and low levels and the second detection end LN-DE has voltage, the zero line voltage can be judged to be too high.
The implementation principle of the reliable single-phase connection detection circuit of commercial power of the embodiment of this application does: the commercial power is correspondingly connected with a commercial power live wire end INPUT-L, a commercial power zero line end INPUT-N and a ground wire end INPUT-PE, the wiring condition of the commercial power is judged according to the output of a first detection end GND-DE and a second detection end LN-DE, and when the ground wire is not connected, the first detection end GND-DE outputs a high level and the second detection end LN-DE has no voltage; when the zero line and the live line are reversely connected, the first detection end GND-DE outputs a high level, and the second detection end LN-DE has voltage; when the voltage of the zero line is too high, the first detection end GND-DE outputs continuously-changed high and low levels, and the second detection end LN-DE outputs voltage.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. A reliable single-phase wiring detection circuit of commercial power which characterized in that: the power supply system comprises a mains supply live wire end INPUT-L, a mains supply zero line end INPUT-N and a ground wire end INPUT-PE, wherein a first diode D1, a first resistor R1 and a capacitor C1 are connected in series between the mains supply live wire end INPUT-L and the ground wire end INPUT-PE, the conducting direction of the first diode D1 is from the mains supply live wire end INPUT-L to the ground wire end INPUT-PE, and the mains supply live wire end INPUT-N is grounded; the direct current input type optocoupler U1 is connected in parallel with two ends of the first diode D1, the conduction direction of the first diode D1 is opposite to the conduction direction of a light emitter of the optocoupler U1, a sensing module is coupled with a light receiver of the optocoupler U1 and comprises an external power supply connected to one end of the light receiver of the optocoupler U1, the other end of the light receiver of the optocoupler U1 is grounded, a second resistor R2 is connected between the light receiver of the optocoupler U1 and the external power supply, and a first detection end GND-DE is led out between the second resistor R2 and the light receiver of the optocoupler U1.
2. The reliable single-phase connection detection circuit of claim 1, wherein: one end of the light emitter of the optical coupler U1 is coupled with a second diode D2, a branch formed by the second diode D2 and the light emitter of the optical coupler U1 is connected with the first diode D1 in parallel, and the conduction direction of the second diode D2 is the same as the conduction direction of the light emitter of the optical coupler U1.
3. The reliable single-phase connection detection circuit of claim 1, wherein: the optocoupler U1 is of a triode output type, and a collector of a light receiver of the optocoupler U1 is connected with the second resistor R2, and an emitter of the optocoupler is grounded.
4. The reliable single-phase connection detection circuit of claim 1, wherein: the testing device is characterized in that a testing branch is connected between the ground wire end INPUT-PE and the capacitor C1, the testing branch comprises a mains supply zero line reference potential GND connected with the mains supply zero line end INPUT-N, a third diode D3 and a voltage division module are sequentially connected between the ground wire end INPUT-PE and the mains supply zero line reference potential GND, and a second detection end LN-DE is arranged between the voltage division modules.
5. The reliable single-phase connection detection circuit of claim 4, wherein: the voltage division module is a third resistor R3 and a fourth resistor R4 which are sequentially connected between one end, far away from the ground wire end INPUT-PE, of a third diode D3 and a reference potential GND of a neutral line of a mains supply, the resistance value of the third resistor R3 is far larger than that of the first resistor R1, and a second detection end LN-DE is led out from a position between a third resistor R3 and a fourth resistor R4.
6. The reliable single-phase connection detection circuit of claim 5, wherein: the resistance value of the third resistor R3 is 6200K omega, the resistance value of the first resistor R1 is 100K omega, and the resistance value of the fourth resistor R4 is 75K omega.
7. The reliable single-phase connection detection circuit of claim 5, wherein: the capacitance value of the capacitor C1 is 10NF/275VAC, and the specification of the optocoupler U1 is NEC 2561.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023345037.8U CN214013869U (en) | 2020-12-31 | 2020-12-31 | Reliable single-phase wiring detection circuit of commercial power |
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| CN202023345037.8U CN214013869U (en) | 2020-12-31 | 2020-12-31 | Reliable single-phase wiring detection circuit of commercial power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114566956A (en) * | 2022-03-08 | 2022-05-31 | 珠海格力电器股份有限公司 | Zero-live line adjusting circuit and method and air conditioner |
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2020
- 2020-12-31 CN CN202023345037.8U patent/CN214013869U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114566956A (en) * | 2022-03-08 | 2022-05-31 | 珠海格力电器股份有限公司 | Zero-live line adjusting circuit and method and air conditioner |
| CN114566956B (en) * | 2022-03-08 | 2023-03-10 | 珠海格力电器股份有限公司 | Zero-live wire adjusting circuit and method and air conditioner |
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