CN220107570U - Open-phase and phase-failure protection circuit and air conditioner - Google Patents
Open-phase and phase-failure protection circuit and air conditioner Download PDFInfo
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- CN220107570U CN220107570U CN202320029545.XU CN202320029545U CN220107570U CN 220107570 U CN220107570 U CN 220107570U CN 202320029545 U CN202320029545 U CN 202320029545U CN 220107570 U CN220107570 U CN 220107570U
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- 238000001514 detection method Methods 0.000 claims abstract description 68
- 238000000819 phase cycle Methods 0.000 claims abstract description 49
- 230000000087 stabilizing effect Effects 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to a phase-failure and phase-failure protection circuit and an air conditioner. The phase sequence detector comprises a phase sequence detection circuit, a phase voltage input circuit and a switch circuit. The input end of the voltage input circuit is connected with a three-phase alternating current power supply, and the output end of the phase voltage input circuit is connected with the input end of the phase sequence detection circuit. The output end of the phase sequence detection circuit is connected with the input end of the switching circuit. The switch circuit adjusts the on-off state according to the detection result of the phase sequence detection circuit. The utility model solves the problem that the device is damaged because equipment such as an air conditioner still continuously runs when faults such as phase failure and error occur, has obvious protection effect on the whole machine, and simultaneously effectively reduces the equipment cost.
Description
Technical Field
The utility model relates to the technical field of phase sequence detection, in particular to a phase-failure and phase-failure protection circuit and an air conditioner.
Background
The phase sequence of the three-phase alternating current has important significance for the normal operation of electric equipment, and a three-phase power supply is generally divided into an A phase, a B phase and a C phase. The existing phase-failure and phase-failure detection circuit cannot embody phase sequence protection, achieves timely circuit protection when faults such as phase sequence errors or phase failure occur, and most of the conditions are that equipment is still enabled to continue to operate with the faults, so that the equipment and devices are greatly damaged.
Disclosure of Invention
The utility model aims to solve the technical problem that equipment is easy to damage when the phase sequence is abnormal in the prior art, and provides a phase-failure and phase-failure protection circuit and an air conditioner.
The technical scheme adopted for solving the technical problems is as follows: constructing a phase-missing and phase-missing protection circuit, which comprises a phase sequence detection circuit, a phase voltage input circuit and a switch circuit;
the input end of the phase voltage input circuit is connected with a three-phase alternating current power supply, and the output end of the phase voltage input circuit is connected with the input end of the phase sequence detection circuit; the output end of the phase sequence detection circuit is connected with the input end of the switch circuit;
and the switching circuit adjusts the on-off state according to the detection result of the phase sequence detection circuit.
Further, in the open-phase and phase-error protection circuit of the present utility model, the phase sequence detection circuit includes a detection chip U2;
the second pin, the third pin and the fourth pin of the detection chip U2 are connected with the output end of the phase voltage input circuit, and the fifth pin of the detection chip U2 is connected with the input end of the switch circuit.
Further, in the open-phase and phase-dislocation protection circuit according to the present utility model, the switching circuit includes a relay RLY1, an eighth diode D8, a triode Q1, a tenth resistor R10, and an eleventh resistor R11; the control coil of the relay RLY1 is connected with two ends of the eighth diode D8, and a normally open contact of the control coil is used for being connected with a load circuit; the collector of the triode Q1 is connected with the positive electrode of the eighth diode D8, the base of the triode Q1 is connected with the fifth pin of the detection chip U2 through the tenth resistor R10 and is grounded through the eleventh resistor R11, and the emitter of the triode Q1 is grounded; the negative electrode of the eighth diode D8 is connected with the positive electrode of the second working power supply.
Further, in the open-phase and phase-error protection circuit of the present utility model, the phase voltage input circuit is a three-phase voltage input circuit; the three-phase voltage input circuit comprises a first branch, a second branch and a third branch;
in the first branch, a first phase voltage end R for connecting a first phase of the three-phase ac power supply is connected to an input anode of a first optocoupler isolator PH1 through a first resistor R1, a zero line end N for connecting a zero line of the three-phase ac power supply is connected to an input cathode of the first optocoupler isolator PH1, a collector of the first optocoupler isolator PH1 is connected to an anode of a first working power supply through a fourth resistor R4, and is connected to a second pin of the detection chip U2 through a fifth resistor R5, and an emitter of the first optocoupler isolator PH1 is grounded;
in the second branch, a second phase voltage end S for connecting a second phase of the three-phase ac power supply is connected to an input anode of a second optocoupler isolator PH2 through a second resistor R2, a zero line end N for connecting a zero line of the three-phase ac power supply is connected to an input cathode of the second optocoupler isolator PH2, a collector of the second optocoupler isolator PH2 is connected to an anode of the first working power supply through a sixth resistor R6, and is connected to a third pin of the detection chip U2 through a seventh resistor R7, and an emitter of the second optocoupler isolator PH2 is grounded;
in the third branch, a third phase voltage end T for connecting a third phase of the three-phase ac power supply is connected to an input anode of a third optocoupler isolator PH3 through a third resistor R3, a zero line end N for connecting a zero line of the three-phase ac power supply is connected to an input cathode of the third optocoupler isolator PH3, a collector of the third optocoupler isolator PH3 is connected to an anode of the first working power supply through an eighth resistor R8, and is connected to a fourth pin of the detection chip U2 through a ninth resistor R9, and an emitter of the third optocoupler isolator PH3 is grounded.
Further, in the open-phase and phase-dislocation protection circuit according to the present utility model, the first branch further includes a fifth diode D5, an anode of the fifth diode D5 is connected to an input cathode of the first optocoupler isolator PH1, and a cathode of the fifth diode D5 is connected to an input anode of the first optocoupler isolator PH 1;
the second branch circuit further comprises a sixth diode D6, wherein the positive electrode of the sixth diode D6 is connected with the input cathode of the second opto-isolator PH2, and the negative electrode of the sixth diode D6 is connected with the input anode of the second opto-isolator PH 2;
the third branch circuit further comprises a seventh diode D7, the positive electrode of the seventh diode D7 is connected to the input cathode of the third optocoupler isolator PH3, and the negative electrode of the seventh diode D7 is connected to the input anode of the third optocoupler isolator PH 3.
Further, the open-phase and phase-error protection circuit further comprises a direct-current voltage stabilizing circuit; the direct current voltage stabilizing circuit is connected with the input end of the phase sequence detecting circuit, the input end of the phase voltage input circuit and the input end of the switching circuit;
the direct current voltage stabilizing circuit provides power supply voltage for the phase sequence detecting circuit, the phase voltage input circuit and the switching circuit.
Further, in the open-phase and phase-error protection circuit according to the present utility model, the dc voltage stabilizing circuit provides a first supply voltage for the phase sequence detecting circuit and the phase voltage input circuit, and provides a second supply voltage for the switching circuit.
Further, in the open-phase and phase-error protection circuit of the present utility model, the dc voltage stabilizing circuit includes a transformer T1, a rectifying circuit, a filter circuit, and a voltage stabilizing chip U1;
the output end of the voltage stabilizing chip U1 is grounded through a second electrolytic capacitor EC2 and a third capacitor C3 respectively and is used as the positive electrode of the first working power supply; the input end of the voltage stabilizing chip U1 is also used as the positive electrode of the second working power supply.
Further, in the open-phase and phase-dislocation protection circuit of the present utility model, an output end of the switching circuit is connected with a load circuit; and adjusting the working state of the load circuit according to the on-off state of the switch circuit.
In addition, the utility model also provides an air conditioner which comprises the open-phase and phase-dislocation protection circuit.
The open-phase and phase-error protection circuit and the air conditioner have the following beneficial effects:
the utility model solves the problem that the device is damaged because equipment such as an air conditioner still continuously runs when faults such as phase failure and error occur, has obvious protection effect on the whole machine, and simultaneously effectively reduces the equipment cost.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a phase-loss and phase-failure protection circuit according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a phase-loss and phase-error protection circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a phase-loss and phase-failure protection circuit according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a phase-loss and phase-failure protection circuit according to an embodiment of the present utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the open-phase and phase-error protection circuit of the present embodiment includes a phase sequence detection circuit, a phase voltage input circuit, and a switching circuit, where an input end of the phase voltage input circuit is connected to a three-phase ac power supply, and an output end of the phase voltage input circuit is connected to an input end of the phase sequence detection circuit; the output end of the phase sequence detection circuit is connected with the input end of the switching circuit. And the switching circuit adjusts the on-off state according to the detection result of the phase sequence detection circuit.
The working principle of the utility model is as follows: the three-phase voltage isolated by the phase voltage input circuit is input into the phase sequence detection circuit for detection, the phase sequence detection circuit samples the voltage waveform in each period and judges whether the phase sequence is correct, if the phase sequence abnormality such as phase-missing or zero-missing fault problem occurs, the phase sequence detection circuit immediately generates an error signal to the switch circuit, the switch circuit adjusts the on-off state of the switch circuit by receiving the error signal corresponding to the phase sequence detection circuit, so that the power supply source of the load circuit connected with the output end of the switch circuit is cut off, or the output end of the switch circuit is disconnected with the load circuit, so as to protect a system or equipment. Specifically, the relay RLY1 thereof performs related operations including opening a path or the like to control the power supply source of other control board circuits of the apparatus. It should be noted that, the process of determining whether the phase sequence is phase-error or phase-failure by the phase sequence detection circuit or the process of detecting the phase sequence may refer to the prior art, and will not be described herein.
In the open-phase and phase-error protection circuit of some embodiments, referring to fig. 2, the phase sequence detection circuit includes a detection chip U2. The second pin, the third pin and the fourth pin of the detection chip U2 are connected with the output end of the phase voltage input circuit, and the fifth pin of the detection chip U2 is connected with the input end of the switch circuit.
Preferably, the phase sequence detection circuit further comprises a second capacitor C2, a first light emitting diode LED1, a second light emitting diode LED2, a sixteenth resistor R16 and a seventeenth resistor R17. Alternatively, the detection chip U2 is not limited to the SN8P2501B-PO8 type detection chip or the like, but may be another type of detection chip that can be used to detect a phase voltage.
The first pin of the detection chip U2 is connected with the first end of the second capacitor C2, the second pin, the third pin and the fourth pin of the detection chip U2 are connected with the output end of the phase voltage input circuit, the fifth pin of the detection chip U2 is connected with the input end of the switch circuit, the sixth pin of the detection chip U2 is connected with the first end of the first light emitting diode LED1, the seventh pin of the detection chip U2 is connected with the first end of the second light emitting diode LED2, the second end of the first light emitting diode LED1 is connected with the first end of the seventeenth resistor R17, the second end of the second light emitting diode LED2 is connected with the first end of the sixteenth resistor R16, and the second end of the second capacitor C2 and the eighth pin of the detection chip U2 are grounded. Specifically, the connection positions of the two light emitting diodes and the detection chip can be interchanged and used for power supply indication and error alarm indication respectively, optionally, the light emitting diodes used as error alarm indication distinguish specific fault errors through different light emitting colors, such as red light if phase sequence is detected to be wrong, green light if phase sequence is detected to be phase-missing, blue light if other fault such as error zero is included, that is, each light emitting color can correspond to a specific phase sequence error or circuit fault.
In the embodiment, the problem that devices are damaged due to the fact that equipment such as an air conditioner still continuously operates when faults such as phase failure and error failure occur is solved, an obvious protection effect is achieved on the whole equipment, and meanwhile equipment cost is effectively reduced.
In the open-phase and phase-error protection circuit of some embodiments, referring to fig. 2, the switching circuit includes a relay rliy 1, an eighth diode D8, a transistor Q1, a tenth resistor R10, and an eleventh resistor R11. The control coil of the relay RLY1 is connected with two ends of the eighth diode D8, and normally open contacts K-1 and K-2 of the control coil are used for connecting load circuits, such as other control board circuits of an air conditioning equipment system, and the control coil is used for supplying power or cutting off power to other circuits through connection or disconnection, so that the function of protecting the air conditioning circuits and elements is achieved. The collector of the triode Q1 is connected with the anode of the eighth diode D8, the base of the triode Q1 is connected with the fifth pin of the detection chip U2 through a tenth resistor R10 and is grounded through an eleventh resistor R11, and the emitter of the triode Q1 is grounded. The cathode of the eighth diode D8 is connected with the anode of the second working power supply.
In the embodiment, the problem that devices are damaged due to the fact that equipment such as an air conditioner still continuously operates when faults such as phase failure and error failure occur is solved, an obvious protection effect is achieved on the whole equipment, and meanwhile equipment cost is effectively reduced.
In the open-phase and phase-error protection circuit of some embodiments, referring to fig. 2, the phase voltage input circuit is a three-phase voltage input circuit. The three-phase voltage input circuit comprises a first branch, a second branch and a third branch.
In the first branch, a first phase voltage end R for connecting a first phase of a three-phase alternating current power supply is connected with an input anode of a first optocoupler isolator PH1 through a first resistor R1, a zero line end N for connecting a zero line of the three-phase alternating current power supply is connected with an input cathode of the first optocoupler isolator PH1, a collector of the first optocoupler isolator PH1 is connected with an anode of a first working power supply through a fourth resistor R4 and is connected with a second pin of a detection chip U2 through a fifth resistor R5, and an emitter of the first optocoupler isolator PH1 is grounded.
In the second branch, a second phase voltage end S for connecting a second phase of the three-phase alternating current power supply is connected with an input anode of a second optocoupler isolator PH2 through a second resistor R2, a zero line end N for connecting a zero line of the three-phase alternating current power supply is connected with an input cathode of the second optocoupler isolator PH2, a collector of the second optocoupler isolator PH2 is connected with an anode of the first working power supply through a sixth resistor R6 and is connected with a third pin of a detection chip U2 through a seventh resistor R7, and an emitter of the second optocoupler isolator PH2 is grounded.
In the third branch, a third phase voltage end T for connecting a third phase of the three-phase alternating current power supply is connected with an input anode of a third optocoupler isolator PH3 through a third resistor R3, a zero line end N for connecting a zero line of the three-phase alternating current power supply is connected with an input cathode of the third optocoupler isolator PH3, a collector of the third optocoupler isolator PH3 is connected with an anode of the first working power supply through an eighth resistor R8 and is connected with a fourth pin of a detection chip U2 through a ninth resistor R9, and an emitter of the third optocoupler isolator PH3 is grounded.
In the embodiment, the problem that devices are damaged due to the fact that equipment such as an air conditioner still continuously operates when faults such as phase failure and error failure occur is solved, an obvious protection effect is achieved on the whole equipment, and meanwhile equipment cost is effectively reduced.
On the basis of the above embodiment, referring to fig. 2, the first branch further includes a fifth diode D5, where an anode of the fifth diode D5 is connected to the input cathode of the first optocoupler isolator PH1, and a cathode of the fifth diode D5 is connected to the input anode of the first optocoupler isolator PH 1.
The second branch further comprises a sixth diode D6, wherein the positive electrode of the sixth diode D6 is connected to the input cathode of the second optocoupler isolator PH2, and the negative electrode of the sixth diode D6 is connected to the input anode of the second optocoupler isolator PH 2.
The third branch further comprises a seventh diode D7, wherein the anode of the seventh diode D7 is connected to the input cathode of the third optocoupler isolator PH3, and the cathode of the seventh diode D7 is connected to the input anode of the third optocoupler isolator PH 3.
In the embodiment, the problem that devices are damaged due to the fact that equipment such as an air conditioner still continuously operates when faults such as phase failure and error failure occur is solved, an obvious protection effect is achieved on the whole equipment, and meanwhile equipment cost is effectively reduced.
In the open-phase and phase-error protection circuit of some embodiments, referring to fig. 3, a dc voltage stabilizing circuit is further included. The direct current voltage stabilizing circuit is connected with the input end of the phase sequence detecting circuit, the input end of the phase voltage input circuit and the input end of the switching circuit.
The direct current voltage stabilizing circuit provides power supply voltage for the phase sequence detecting circuit, the phase voltage input circuit and the switching circuit. Optionally, the direct current voltage stabilizing circuit provides a first power supply voltage for the phase sequence detecting circuit and the phase voltage input circuit, and provides a second power supply voltage for the switching circuit. Specifically, in the embodiment of the present utility model, the required power supply voltages of other circuits are 5V and 11.5V, but the dc voltage provided by the dc voltage stabilizing power supply circuit may be set according to the required power supply voltage of other circuits, for example, if the required power supply voltage of the detection circuit is 3.3V, the dc voltage stabilizing power supply circuit may provide 3.3V dc power, or 12V, 8V, 9V, and so on.
In one embodiment, referring to fig. 2, the dc voltage stabilizing circuit includes a transformer T1, a rectifying circuit, a filter circuit, and a voltage stabilizing chip U1. The output end of the voltage stabilizing chip U1 is grounded through the second electrolytic capacitor EC2 and the third capacitor C3 respectively and is used as the positive electrode of the first working power supply, and the input end of the voltage stabilizing chip U1 is also used as the positive electrode of the second working power supply.
Specifically, the dc voltage stabilizing circuit includes a mains input terminal, a FUSE1, a varistor RV1, an X capacitor CX1, a transformer T1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, a first capacitor C1, and a third capacitor C3. Alternatively, the voltage stabilizing chip U1 is not limited to 7805 voltage stabilizing chip or the like, as long as it can supply the required power supply voltage to other module circuits in the circuit. Optionally, the mains supply input end meets specific standards of different countries and can be 220V, 110V, 230V, 100V and the like.
The first end of the first electrolytic capacitor EC1 is connected to the input end of the switch circuit, the first end of the second electrolytic capacitor EC2 is connected to the input end of the phase voltage input circuit and the input end of the phase sequence detection circuit, specifically, the first end of the second electrolytic capacitor EC2 is connected to the first pin of the detection chip U2, the first end of the second capacitor C2, the second end of the sixteenth resistor R16 and the second end of the seventeenth resistor R17, the FUSE1 is connected to the live wire end L of the mains input end, the first end of the varistor RV1, the first end of the X capacitor CX1 and the first end of the transformer T1, the zero line end N of the mains input end is connected to the second end of the varistor RV1, the second end of the X capacitor CX1 and the second end of the transformer T1, the third end of the transformer T1 is connected to the first end of the second diode D2 and the second end of the third diode D3, the first end of the transformer T1 is connected to the first end of the first diode D1 and the second end of the fourth diode D4, the first end of the voltage stabilizing chip U1 is connected to the first end of the first diode C1 and the first end of the third diode C1 and the third end of the third capacitor C3 is connected to the first end of the electrolytic capacitor C2.
In this embodiment, the dc voltage stabilizing circuit provides the required supply voltage for other module circuits of the open-phase and phase-error protection circuit.
In the open-phase and phase-error protection circuit of some embodiments, referring to fig. 4, an output end of the switching circuit is connected to an input end of the load circuit, and an operating state of the load circuit is adjusted according to an on-off state of the switching circuit. That is, when the switch circuit is on, the load circuit is on the power supply source and is in a normal working state, and when the switch circuit receives an error signal to be off, the load circuit is off.
In the embodiment, the problem that devices are damaged due to the fact that equipment such as an air conditioner still continuously operates when faults such as phase failure and error failure occur is solved, an obvious protection effect is achieved on the whole equipment, and meanwhile equipment cost is effectively reduced.
In another preferred embodiment, the air conditioner of the present embodiment includes a phase-loss and phase-failure protection circuit as described above, optionally including but not limited to a hvac, and the like.
In this embodiment, the air conditioner adopting the phase-failure protection circuit can complete phase-failure detection and fault judgment of the phase sequence, and cut off the power supply loop of other control boards when the fault occurs, thereby solving the problem that the air conditioning system still continuously operates when the faults such as phase failure and phase failure occur to cause damage of devices, playing an obvious protection effect on the whole machine, and simultaneously effectively reducing the equipment cost.
The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same according to the content of the present utility model, and not to limit the scope of the present utility model. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (8)
1. The open-phase and phase-error protection circuit is characterized by comprising a phase sequence detection circuit, a phase voltage input circuit and a switch circuit;
the input end of the phase voltage input circuit is connected with a three-phase alternating current power supply, and the output end of the phase voltage input circuit is connected with the input end of the phase sequence detection circuit; the output end of the phase sequence detection circuit is connected with the input end of the switch circuit;
the switching circuit adjusts the on-off state according to the detection result of the phase sequence detection circuit;
the phase sequence detection circuit comprises a detection chip U2; the second pin, the third pin and the fourth pin of the detection chip U2 are connected with the output end of the phase voltage input circuit, and the fifth pin of the detection chip U2 is connected with the input end of the switch circuit;
the switching circuit comprises a relay RLY1, an eighth diode D8, a triode Q1, a tenth resistor R10 and an eleventh resistor R11; the control coil of the relay RLY1 is connected with two ends of the eighth diode D8, and a normally open contact of the control coil is used for being connected with a load circuit; the collector of the triode Q1 is connected with the positive electrode of the eighth diode D8, the base of the triode Q1 is connected with the fifth pin of the detection chip U2 through the tenth resistor R10 and is grounded through the eleventh resistor R11, and the emitter of the triode Q1 is grounded; the negative electrode of the eighth diode D8 is connected with the positive electrode of the second working power supply.
2. The open-phase and phase-error protection circuit of claim 1, wherein the phase voltage input circuit is a three-phase voltage input circuit; the three-phase voltage input circuit comprises a first branch, a second branch and a third branch;
in the first branch, a first phase voltage end R for connecting a first phase of the three-phase ac power supply is connected to an input anode of a first optocoupler isolator PH1 through a first resistor R1, a zero line end N for connecting a zero line of the three-phase ac power supply is connected to an input cathode of the first optocoupler isolator PH1, a collector of the first optocoupler isolator PH1 is connected to an anode of a first working power supply through a fourth resistor R4, and is connected to a second pin of the detection chip U2 through a fifth resistor R5, and an emitter of the first optocoupler isolator PH1 is grounded;
in the second branch, a second phase voltage end S for connecting a second phase of the three-phase ac power supply is connected to an input anode of a second optocoupler isolator PH2 through a second resistor R2, a zero line end N for connecting a zero line of the three-phase ac power supply is connected to an input cathode of the second optocoupler isolator PH2, a collector of the second optocoupler isolator PH2 is connected to an anode of the first working power supply through a sixth resistor R6, and is connected to a third pin of the detection chip U2 through a seventh resistor R7, and an emitter of the second optocoupler isolator PH2 is grounded;
in the third branch, a third phase voltage end T for connecting a third phase of the three-phase ac power supply is connected to an input anode of a third optocoupler isolator PH3 through a third resistor R3, a zero line end N for connecting a zero line of the three-phase ac power supply is connected to an input cathode of the third optocoupler isolator PH3, a collector of the third optocoupler isolator PH3 is connected to an anode of the first working power supply through an eighth resistor R8, and is connected to a fourth pin of the detection chip U2 through a ninth resistor R9, and an emitter of the third optocoupler isolator PH3 is grounded.
3. The open-phase and phase-error protection circuit according to claim 2, wherein the first branch further comprises a fifth diode D5, the anode of the fifth diode D5 is connected to the input cathode of the first optocoupler isolator PH1, and the cathode of the fifth diode D5 is connected to the input anode of the first optocoupler isolator PH 1;
the second branch circuit further comprises a sixth diode D6, wherein the positive electrode of the sixth diode D6 is connected with the input cathode of the second opto-isolator PH2, and the negative electrode of the sixth diode D6 is connected with the input anode of the second opto-isolator PH 2;
the third branch circuit further comprises a seventh diode D7, the positive electrode of the seventh diode D7 is connected to the input cathode of the third optocoupler isolator PH3, and the negative electrode of the seventh diode D7 is connected to the input anode of the third optocoupler isolator PH 3.
4. The open-phase and phase error protection circuit of claim 1, further comprising a dc voltage regulator circuit; the direct current voltage stabilizing circuit is connected with the input end of the phase sequence detecting circuit, the input end of the phase voltage input circuit and the input end of the switching circuit;
the direct current voltage stabilizing circuit provides power supply voltage for the phase sequence detecting circuit, the phase voltage input circuit and the switching circuit.
5. The open-phase and phase-error protection circuit of claim 4, wherein the dc voltage regulator circuit provides a first supply voltage to the phase sequence detection circuit and the phase voltage input circuit and a second supply voltage to the switching circuit.
6. The open-phase and phase-error protection circuit according to claim 4, wherein the direct-current voltage stabilizing circuit comprises a transformer T1, a rectifying circuit, a filter circuit and a voltage stabilizing chip U1;
the output end of the voltage stabilizing chip U1 is grounded through a second electrolytic capacitor EC2 and a third capacitor C3 respectively and is used as the positive electrode of the first working power supply; the input end of the voltage stabilizing chip U1 is also used as the positive electrode of the second working power supply.
7. The open-phase and phase-error protection circuit according to claim 1, wherein an output end of the switching circuit is connected with a load circuit; and adjusting the working state of the load circuit according to the on-off state of the switch circuit.
8. An air conditioner comprising the open-phase and phase-error protection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320029545.XU CN220107570U (en) | 2023-01-04 | 2023-01-04 | Open-phase and phase-failure protection circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320029545.XU CN220107570U (en) | 2023-01-04 | 2023-01-04 | Open-phase and phase-failure protection circuit and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN220107570U true CN220107570U (en) | 2023-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320029545.XU Active CN220107570U (en) | 2023-01-04 | 2023-01-04 | Open-phase and phase-failure protection circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220107570U (en) |
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2023
- 2023-01-04 CN CN202320029545.XU patent/CN220107570U/en active Active
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