CN215894899U - Single-phase alternating current connection fault line detection circuit and air conditioner - Google Patents
Single-phase alternating current connection fault line detection circuit and air conditioner Download PDFInfo
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- CN215894899U CN215894899U CN202122302063.0U CN202122302063U CN215894899U CN 215894899 U CN215894899 U CN 215894899U CN 202122302063 U CN202122302063 U CN 202122302063U CN 215894899 U CN215894899 U CN 215894899U
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Abstract
The utility model provides a single-phase alternating current wrong connection detection circuit and an air conditioner, wherein the wrong connection detection circuit comprises: the voltage reduction capacitor C1 limits the maximum current of the protection circuit through resistance-capacitance; the voltage dividing resistor R3 generates voltage by current through the voltage dividing resistor R3, and the voltage is stored in the electrolytic capacitor E1 after half-wave rectification by the rectifier diode D1; a base electrode of the triode Q1 is connected with a positive electrode terminal of the electrolytic capacitor E1, a collector electrode of the triode Q1 is connected with a pin 2 of the relay, and the pin 2 of the relay is connected with a preset power supply; when the voltage of the electrolytic capacitor E1 is smaller than a preset voltage threshold, the triode works in a cut-off region, and the relay works normally; when the voltage of the electrolytic capacitor E1 is larger than the voltage preset threshold, the triode works in the conducting area, and the rear-stage circuit is disconnected. According to the single-phase alternating current connection fault line detection circuit and the air conditioner, when the air conditioner controller is in fault connection with a high-voltage power supply, devices on the controller are prevented from being damaged by high voltage, the implementation mode is simple and convenient, and the cost is low.
Description
Technical Field
The utility model relates to the technical field of air conditioners, in particular to a single-phase alternating current connection fault line detection circuit and an air conditioner.
Background
In the processes of workshop production inspection and air conditioner installation, the indoor unit needs to be connected with three-phase electricity, in the connection process, a phenomenon of wrong connection of wires can occur to workers, and for the type suitable for three-phase electricity, for example, a commercial high-power single-phase variable frequency air conditioner, if a two-phase live wire of three-phase electricity is mistakenly connected to a controller of the indoor unit, air conditioner components such as an indoor fan and the controller can be damaged, so that the air conditioner cannot be used
Most of the existing controllers adopt a linear transformer and optical coupling detection, and the detection is carried out after the voltage output by the linear transformer is too high (about 30V) after the wire is connected in a wrong way.
The method limits the controller to adopt two power supplies for power supply, namely a linear power supply is adopted for main control, a switching power supply is adopted for driving, the cost is high, and devices are complex.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a single-phase ac miswiring detection circuit and an air conditioner, which can conveniently and quickly detect whether the line sequence of the three-phase ac power is miswired, and protect each load of the air conditioner for safe and reliable use.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
a single-phase alternating current wrong connection detection circuit is arranged between a zero line and a ground wire, and comprises:
the voltage reduction capacitor C1 limits the maximum current of the protection circuit through resistance-capacitance;
the voltage dividing resistor R3 is connected with the electrolytic capacitor E1, the current generates voltage through the voltage dividing resistor R3, and the voltage is stored in the electrolytic capacitor E1 after half-wave rectification through the rectifier diode D1;
a base electrode of the triode Q1 is connected with a positive electrode end of the electrolytic capacitor E1, an emitting electrode of the triode Q1 is connected with a negative electrode end of the electrolytic capacitor E1, a collecting electrode of the triode Q1 is connected with a pin 2 of the relay, and the pin 2 of the relay is connected with a preset power supply;
when the voltage of the electrolytic capacitor E1 is smaller than or equal to a preset voltage threshold, the triode works in a cut-off region, and when the main chip outputs a relay driving signal RAY, the relay normally works under the action of a preset power supply; when the voltage of the electrolytic capacitor E1 is greater than the preset voltage threshold, the triode works in the conducting area, the voltage of the pin end of the relay 2 is 0V, and when the main chip outputs a relay driving signal RAY, the post-stage circuit is disconnected.
The single-phase alternating current connection fault line detection circuit provided by the utility model has the advantages that the circuit protection improvement is carried out through the load access end, and the reasonable protection circuit is arranged, so that the devices on the controller are not damaged by high voltage when the air conditioner controller is in fault connection with a high-voltage power supply.
Further, the value range of the preset voltage threshold is 0.6V-0.9V.
The arrangement avoids the damage of electrical elements caused by overlarge voltage, the current flowing through the single-phase alternating-current connection fault line detection circuit is small, the voltage released by the electrolytic capacitor E1 also belongs to the range of human body safety voltage, and if the situation of electric leakage occurs when a human body touches the circuit, the potential safety hazards such as electric shock are avoided.
Further, the single-phase ac phase-connection fault line detection circuit further includes:
and the current-limiting resistor R1 is arranged between the positive electrode terminal of the electrolytic capacitor E1 and the base electrode of the triode Q1, and the current-limiting resistor R1 is connected with the base electrode of the electrolytic capacitor E1.
The current-limiting resistor R1 is mainly used for preventing the damage of a triode caused by high-voltage impact generated when a power plug is powered on for the first time and is plugged or unplugged quickly or the contact of the power plug is poor, and ensuring the accuracy and reliability of the fault-tolerant connection detection of the single-phase alternating-current connection fault line detection circuit.
Further, the single-phase ac phase-connection fault line detection circuit further includes:
and the current limiting resistor R2 is arranged between the current limiting resistor R1 and the grounding wire, and the current limiting resistor R2 is arranged between the current limiting resistor R1 and the grounding wire.
The arrangement further improves the reliability of the error-proof detection of the single-phase alternating-current connection error line detection circuit.
Furthermore, the negative electrode terminal of the electrolytic capacitor E1 is connected to the ground line.
The arrangement is convenient for simplifying the circuit structure and simultaneously ensures the reliability of the error-proof connection detection of the single-phase alternating current connection error line detection circuit.
Further, the single-phase ac phase-connection fault line detection circuit further includes:
and the discharge resistor R4 is used for providing a discharge loop for the voltage reduction capacitor C1 after power failure.
This setting prevents when quick plug power plug or plug contact is bad, and the residual voltage and the grid voltage stack on the step-down electric capacity C1 form high-voltage impact to follow-up device to and prevent to extract behind the power plug, step-down electric capacity C1 contacts the human body and produces the injury to the personnel.
Furthermore, the 2 feet of the relay are connected with a preset power supply which is a 12V voltage power supply.
The utility model also discloses an air conditioner, wherein the air conditioner is provided with the single-phase alternating current connection fault line detection circuit.
Compared with the prior art, the single-phase alternating current connection fault line detection circuit and the air conditioner have the following advantages:
(1) the single-phase alternating current wrong connection detection circuit and the air conditioner provided by the utility model have the advantages that the single power supply is used for detecting the single-phase alternating current connection by utilizing the resistance-capacitance voltage reduction circuit, the detection whether the line sequence of the three-phase alternating current is wrong or not is simply and reliably realized, and the safe and reliable use of each load connected at the later stage is protected.
(2) According to the single-phase alternating current connection fault line detection circuit and the air conditioner, when the air conditioner controller is in fault connection with a high-voltage power supply, devices on the controller are prevented from being damaged by high voltage, the implementation mode is simple and convenient, and the cost is low.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic circuit topology diagram of a single-phase ac line fault detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, objectives and functions of the present invention easy to understand, embodiments of the present invention will be described in detail with reference to the specific drawings.
Example 1
The utility model discloses a single-phase alternating current wrong connection detection circuit which is arranged between a zero line and a ground wire, and comprises:
the voltage reduction capacitor C1 limits the maximum current of the protection circuit through the capacitance resistance capacitance;
the voltage dividing resistor R3 is connected with the electrolytic capacitor E1, the current generates certain voltage through the voltage dividing resistor R3, and the certain voltage is generated in the electrolytic capacitor E1 after half-wave rectification through the rectifier diode D1;
a rectifier diode D1 for half-wave rectifying the current flowing to the electrolytic capacitor E1;
a base electrode of the triode Q1 is connected with a positive electrode end of the electrolytic capacitor E1, an emitting electrode of the triode Q1 is connected with a negative electrode end of the electrolytic capacitor E1, a collecting electrode of the triode Q1 is connected with a pin 2 of the relay, and the pin 2 of the relay is connected with a preset power supply;
when the voltage of the electrolytic capacitor E1 is smaller than a preset voltage threshold, the triode works in a cut-off region, and when the main chip outputs a relay driving signal RAY, the relay works normally; when the voltage of the electrolytic capacitor E1 is greater than the preset voltage threshold, the triode works in the conducting area, the voltage of the pin end of the relay 2 is 0V, and when the main chip outputs a relay driving signal RAY, the post-stage circuit is disconnected.
The utility model relates to a single-phase alternating current connection fault line detection circuit, which is characterized in that a detection circuit is arranged between a zero line and a ground wire, the maximum working current is limited by using capacitive reactance generated by a capacitor under an alternating current signal with certain frequency, the current generates certain voltage through a divider resistor R3, after half-wave rectification is carried out by a rectifier diode D1, a certain voltage value exists in an electrolytic capacitor E1, an electrolytic capacitor E1 filters the voltage after voltage stabilization, and meanwhile, electric energy is provided for a load in a half period of power supply turn-off.
(1) When the zero line and the live line are not crossed, the voltage fluctuation is between 165V and 265V, the voltage of the electrolytic capacitor E1 is smaller than a preset voltage threshold after the voltage on the voltage dividing resistor R3 is subjected to half-wave rectification, the triode works in a cut-off region, the voltage of the No. 2 terminal of the relay is the output voltage of a preset power supply, and when the main chip outputs a relay driving signal RAY, the relay can normally work.
(2) When the zero live wire is connected in a staggered manner to form a double live wire, the voltage fluctuation is between 310V and 380V, the voltage of the electrolytic capacitor E1 after the voltage on the resistor R3 is subjected to half-wave rectification is larger than a preset voltage threshold, the triode works in a conduction region, the output voltage of a preset power supply flows to the ground through the triode, the voltage of the No. 2 terminal of the relay is 0V, and when the main chip outputs a relay driving signal RAY, the relay cannot normally work, so that a rear-stage circuit is disconnected, and the protection effect is achieved.
The single-phase alternating current connection fault line detection circuit provided by the utility model has the advantages that the circuit protection improvement is carried out through the load access end, and the reasonable protection circuit is arranged, so that the devices on the controller are not damaged by high voltage when the air conditioner controller is in fault connection with a high-voltage power supply.
As a preferred example of the present invention, the voltage preset threshold ranges from 0.6V to 0.9V. Preferably, as an example of the present invention, the voltage preset threshold is 0.7V. Because what the controller accessed is generally 220V AC commercial power, step down AC commercial power through step-down electric capacity C1, then flow to electrolytic capacitor E1 after carrying out step-down rectification processing through rectifier diode D1 again, avoid the voltage too big electric appliance component to damage to the voltage that wrong connection reminding device carried also belongs to human safe voltage scope, if the condition of electric leakage appears when the human body touches, avoid causing potential safety hazards such as electric shock.
As a preferred example of the present invention, the single-phase ac line fault detection circuit further includes: and the current-limiting resistor R1 is arranged between the positive electrode terminal of the electrolytic capacitor E1 and the base electrode of the triode Q1, and the current-limiting resistor R1 is connected with the base electrode of the electrolytic capacitor E1.
The current-limiting resistor R1 is mainly used for preventing the damage of a triode caused by high-voltage impact generated when a power plug is powered on for the first time and is plugged or unplugged quickly or the contact of the power plug is poor, and ensuring the accuracy and reliability of the fault-tolerant connection detection of the single-phase alternating-current connection fault line detection circuit.
As a preferred example of the present invention, the single-phase ac line fault detection circuit further includes: and the current limiting resistor R2 is arranged between the current limiting resistor R1 and the grounding wire, and the current limiting resistor R2 is arranged between the current limiting resistor R1 and the grounding wire.
Because single-phase AC meets wrong line detection circuitry at zero live wire missed wrong line, triode work is in the ending region, electrolytic capacitor E1's voltage is less than the voltage and predetermines the threshold value, at this moment, this partial circuit flows to the earth connection through current-limiting resistor R2, also can avoid flowing through triode Q1's the too big damage to the triode simultaneously.
The arrangement further improves the reliability of the error-proof detection of the single-phase alternating-current connection error line detection circuit.
As a preferred example of the present invention, the negative electrode terminal of the electrolytic capacitor E1 is connected to a ground line.
The arrangement is convenient for simplifying the circuit structure and simultaneously ensures the reliability of the error-proof connection detection of the single-phase alternating current connection error line detection circuit.
As a preferred example of the present invention, the single-phase ac line fault detection circuit further includes:
and the discharge resistor R4 is used for providing a discharge loop for the voltage reduction capacitor C1 after power failure.
This setting prevents when quick plug power plug or plug contact failure, and the residual voltage on the step-down electric capacity C1 and the stack of electric wire netting voltage form high-voltage impact to follow-up device to and prevent to extract behind the power plug, detection circuitry or controller contact the human body and produce the injury to the personnel.
As a preferred example of the utility model, the 2-pin connection of the relay is a preset power supply with 12V voltage.
This arrangement meets the requirement for the relay 2 and the load circuit to operate normally.
The utility model also discloses an air conditioner, wherein the air conditioner is provided with the single-phase alternating current connection fault line detection circuit. When the air conditioner controller is in misconnection with the high-voltage power supply, the device on the controller is prevented from being damaged by high voltage, the implementation mode is simple and convenient, and the cost is low.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A single-phase alternating current connects wrong line detection circuitry, sets up between zero line and ground wire, its characterized in that connects wrong line detection circuitry includes:
the voltage reduction capacitor C1 limits the maximum current of the protection circuit through the capacitance resistance capacitance;
the voltage dividing resistor R3 is connected with the electrolytic capacitor E1, the current generates voltage through the voltage dividing resistor R3, and the voltage is stored in the electrolytic capacitor E1 after half-wave rectification through the rectifier diode D1;
a base electrode of the triode Q1 is connected with a positive electrode end of the electrolytic capacitor E1, an emitting electrode of the triode Q1 is connected with a negative electrode end of the electrolytic capacitor E1, a collecting electrode of the triode Q1 is connected with a pin 2 of the relay, and the pin 2 of the relay is connected with a preset power supply;
when the voltage of the electrolytic capacitor E1 is smaller than a preset voltage threshold, the triode works in a cut-off region, and when the main chip outputs a relay driving signal RAY, the relay normally works under the action of a preset power supply; when the voltage of the electrolytic capacitor E1 is greater than the preset voltage threshold, the triode works in the conducting area, the voltage of the pin end of the relay 2 is 0V, and when the main chip outputs a relay driving signal RAY, the post-stage circuit is disconnected.
2. The single-phase ac phase-connection fault line detection circuit according to claim 1, wherein the preset voltage threshold has a value ranging from 0.6V to 0.9V.
3. The single-phase ac line fault detection circuit according to claim 2, further comprising:
and the current-limiting resistor R1 is arranged between the positive electrode terminal of the electrolytic capacitor E1 and the base electrode of the triode Q1, and the current-limiting resistor R1 is connected with the base electrode of the electrolytic capacitor E1.
4. The single-phase ac line fault detection circuit according to claim 2, further comprising:
and the current limiting resistor R2 is arranged between the current limiting resistor R1 and the grounding wire, and the current limiting resistor R2 is arranged between the current limiting resistor R1 and the grounding wire.
5. The single-phase ac miswire connection detection circuit according to claim 1, wherein a negative electrode terminal of the electrolytic capacitor E1 is connected to a ground line.
6. The single-phase ac line fault detection circuit according to claim 1, further comprising:
and the discharge resistor R4 is used for providing a discharge loop for the voltage reduction capacitor C1 after power failure.
7. The single-phase ac line fault detection circuit according to claim 2, wherein the 2-pin connection default power supply of the relay is a 12V voltage power supply.
8. An air conditioner, characterized in that the air conditioner is provided with the single-phase AC connection fault line detection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122302063.0U CN215894899U (en) | 2021-09-23 | 2021-09-23 | Single-phase alternating current connection fault line detection circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122302063.0U CN215894899U (en) | 2021-09-23 | 2021-09-23 | Single-phase alternating current connection fault line detection circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215894899U true CN215894899U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122302063.0U Active CN215894899U (en) | 2021-09-23 | 2021-09-23 | Single-phase alternating current connection fault line detection circuit and air conditioner |
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| CN (1) | CN215894899U (en) |
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- 2021-09-23 CN CN202122302063.0U patent/CN215894899U/en active Active
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Effective date of registration: 20230505 Address after: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 519000 202, floor 2, building B, high tech Zone headquarters base, No. 2 Qianwan Second Road, Tangjiawan Town, high tech Zone, Zhuhai, Guangdong Patentee before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. |