CN203385141U - Air conditioner, indoor unit and alternating current overvoltage detection device of indoor unit - Google Patents

Air conditioner, indoor unit and alternating current overvoltage detection device of indoor unit Download PDF

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Publication number
CN203385141U
CN203385141U CN201320230206.4U CN201320230206U CN203385141U CN 203385141 U CN203385141 U CN 203385141U CN 201320230206 U CN201320230206 U CN 201320230206U CN 203385141 U CN203385141 U CN 203385141U
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China
Prior art keywords
voltage
input
resistance
air conditioner
power
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Withdrawn - After Issue
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CN201320230206.4U
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Chinese (zh)
Inventor
张武军
梁敏游
游志强
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea Refrigeration Equipment Co Ltd
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Abstract

The utility model belongs to the field of air conditioner control, in particular to an air conditioner, an indoor unit and an alternating current overvoltage detection device of the indoor unit. The alternating current overvoltage detection device provided by the embodiment of the utility model comprises an input voltage conversion module and an opto-coupler, which are connected with an input alternating current power supply, and an MCU (microprogrammed control unit) detection processing module; a voltage signal transmitted by the opto-coupler is obtained by an I/O pin of an MCU chip; whether the currently input power supply voltage is overhigh is judged according to the period T of a rectangular wave formed by the voltage signal; when the period T is smaller than a preset voltage period threshold value t, the condition that the currently input alternating current power supply is overhigh is determined, and the power supplying for the outdoor unit of the air conditioner is stopped under control. The whole circuit is simple in combining structure, the cost is low, and the detection can be performed by the common I/O pin of the MCU chip without the dependency on an A/D (analog/digital) detection port, so the resource demand on the A/D port of the MCU chip is greatly reduced, and the air conditioner and the indoor unit and an alternating current overvoltage detection device of the indoor unit are suitable for promotion and application on a large scale.

Description

A kind of air-conditioner, indoor set and AC overvoltage checkout gear thereof
Technical field
The utility model belongs to the air-conditioner control field, relates in particular to a kind of air-conditioner, indoor set and AC overvoltage checkout gear thereof.
Background technology
In existing air-conditioner, indoor set does not generally all have voltage detecting function, and the power supply of off-premises station is also generally to be controlled by indoor set; When the AC supply voltage of outside input is too high, easily cause the device failure such as the driven compressor module of off-premises station and blower fan driver module, even compressor itself all can cause damage with blower fan itself.For fear of these phenomenons occurring, need to increase the overvoltage checkout gear at indoor set: when the AC supply voltage of outside input is too high, just no longer to the off-premises station power supply, and display board prompting overvoltage fault, control air-conditioner out of service.
The method that current AC overvoltage detects mainly contains following several: a kind of method is to adopt linear transformer that alternating voltage is converted to DC voltage; then the AD by the MCU chip detects the DC voltage value after mouth detects current conversion; determine the alternating voltage of current input according to the AD value of sampling, then judge whether to need overvoltage protection according to this magnitude of voltage.This scheme need to increase a linear transformer, but also has taken the AD port of MCU chip; In fact, the MCU chip of current air-conditioner many sensor temperatures of need to sampling, inevitably need to take the AD mouth of MCU chip, and the AD mouth resource of MCU chip is more nervous; In addition owing to having adopted linear transformer, the one, the cost compare of linear transformer itself is high, and the 2nd, the volume ratio of linear transformer is larger, causes the design comparison difficulty of pcb board, also to assembling process, has brought difficulty.
The control thinking that another AC overvoltage detects is first to increase a rectification circuit; alternating voltage is converted to DC voltage; then through a component volt circuit; after higher voltage dividing potential drop is low-voltage; receive on the AD mouth of MCU chip; determine the ac voltage of current input by the AD sampling of MCU chip again, then judge whether to need the AC overvoltage protection according to this magnitude of voltage, concrete structure as shown in Figure 1.There is the problem of MCU chip AD mouth resource anxiety too in this method, and adopt the mode of AD port sampling all to need a reference voltage Vref as benchmark, if this reference voltage V ref is unstable, change, can cause the automatically controlled sampled voltage of AD mouth input inaccurate, and then exist error to affect accuracy on the input voltage that judges the AD mouth by program, thereby cause the actual value of alternating voltage checkout gear cut-out off-premises station power supply inaccurate, thereby the potential safety hazard of existence.The another one shortcoming is no matter this circuit is to adopt first rectification step-down processing or first step-down rectification more again, and processing procedure is all cumbersome, and all needs to increase a rectification circuit, and structure is relative complex also.
On the other hand, as shown in Figure 1 the AC overvoltage testing circuit in, the low-voltage that ac high voltage and the MCU chip of input used not have to isolate, easily cause the forceful electric power signal to seal in weak electric signal, burns out the hidden danger of various devices and generation electric shock accidents, and security is poor.So the patent documentation that publication number is CN200920252216.1 discloses a kind of overvoltage with isolation and has detected control method, but the voltage signal transmission unit of this scheme needs the devices such as Schmidt trigger, rp-drive, triode and relay of NAND gate, complex structure, install more inconveniently, nor be easy to realize.
The utility model content
At first the AC overvoltage checkout gear of a kind of air conditioner room unit of providing is provided the purpose of this utility model, and the AC overvoltage structure of the detecting device that is intended to solve existing air conditioner room unit is complicated, be difficult to realize, cost is higher and can cause the technical problem of indoor set internal resource anxiety.
The technical scheme that at first the utility model adopts is:
A kind of AC overvoltage checkout gear of air conditioner room unit comprises:
Be connected between the live wire L and zero line N of AC power of input, be transferred to the input voltage modular converter of subsequent conditioning circuit module after will input voltage transforming;
Be connected to the output of described input voltage modular converter, the voltage signal of input be transferred to the optocoupler of MCU detection module;
Obtain the voltage signal of described optocoupler transmission by the I/O pin of MCU chip, the cycle T of the square wave formed according to this voltage signal judges that whether the AC supply voltage of current input is too high: when the cycle T of the square wave formed when this voltage signal is less than default voltage cycle threshold value t, the AC supply voltage of determining current input is too high, and controls the MCU Check processing module stopped to the air-conditioner outdoor unit power supply.And, described voltage cycle threshold value t be greater than input ac power cycle T 1 1/4th, and be less than the cycle T 1 of AC power.
Second aspect, the purpose of this utility model is to provide a kind of air conditioner room unit, this kind of indoor set is built-in above-mentioned AC overvoltage checkout gear, when the AC supply voltage of outside input is too high, the MCU chip can stop the power supply to off-premises station, and points out the overvoltage fault on display board.
The third aspect, the purpose of this utility model also is to provide a kind of air-conditioner, this air-conditioner comprises indoor set and off-premises station, described indoor set is the above-mentioned built-in indoor set of specific AC overvoltage checkout gear, when the AC supply voltage of outside input is too high, MCU chip in indoor set can stop the power supply to off-premises station, and points out the overvoltage fault on display board.
The air-conditioner provided according to the utility model, indoor set and AC overvoltage checkout gear thereof, increase a kind of AC overvoltage checkout gear on the basis of current air conditioner room unit, the operation principle of this circuit is mainly when the AC supply voltage of input changes, be different the rectangle wave period produced, thereby the size in the square wave cycle detected according to MCU Check processing module, whether the crest voltage that judges the AC power of current input is greater than threshold value: when the cycle of the voltage signal that input detected is less than default voltage cycle threshold value, the AC supply voltage of determining current input is too high, and control stops powering to air-conditioner outdoor unit, reach the effect of overvoltage protection.
The composition of whole circuit is simple in structure, with low cost, and can detect by the common I/O pin of MCU chip, does not need to rely on A/D to detect mouth, has reduced to a great extent the A/D mouth resource requirement to the MCU chip; Because do not adopt the mode of AD sampling to detect AC overvoltage, so do not exist because AC-input voltage changes, do not cause that reference voltage changes the shortcoming that causes detected alternating voltage error.Further adopted the method for two-way light-coupled isolation, solved alternating voltage detection in the past and do not possessed the shortcoming of isolation effect, but also do not needed the devices such as Schmidt trigger, rp-drive are installed, simple in structure, easily to install, cost is also lower.In actual production and use procedure, according to the different parameters such as kind, model and the environment for use change voltage threshold of air-conditioner, also be easy to realize, be conducive to promotion and application on a large scale.
The accompanying drawing explanation
Fig. 1 is existing a kind of AC overvoltage testing circuit structural representation;
Fig. 2 is the structured flowchart of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model;
Fig. 3 is the structure chart of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model the first embodiment;
Fig. 4 is the square wave schematic diagram that the I/O pin of the MCU chip shown in Fig. 3 obtains when the AC supply voltage of input is different: Fig. 4 a is the waveform schematic diagram of the AC power of input, Fig. 4 b means that the crest voltage of the AC power of input is less than threshold voltage, and Fig. 4 c means that the crest voltage of the AC power of input is greater than threshold voltage.
Fig. 5 is the structure chart of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model the second embodiment;
Fig. 6 is the square wave schematic diagram that the I/O pin of the MCU chip shown in Fig. 5 obtains when the AC supply voltage of input is different: Fig. 6 a is the waveform schematic diagram of the AC power of input, Fig. 6 b means that the crest voltage of the AC power of input is less than threshold voltage, and Fig. 6 c means that the crest voltage of the AC power of input is greater than threshold voltage;
Fig. 7 is the structure chart of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model the 3rd embodiment.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The AC overvoltage checkout gear of the air conditioner room unit that the utility model provides, form simple in structurely, with low cost, and can detect by the common I/O pin of MCU chip, reduced the A/D mouth resource requirement to the MCU chip.And, in actual production and use procedure, according to the different parameters setting voltage threshold values such as kind, model and environment for use of air-conditioner, also be easy to realize, be conducive to promotion and application on a large scale.
Fig. 2 shows the structured flowchart of the AC overvoltage checkout gear of the air conditioner room unit that the utility model provides; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
A kind of AC overvoltage checkout gear of air conditioner room unit comprises: input voltage modular converter 100, optocoupler 200 and MCU Check processing module 300;
Wherein, input voltage modular converter 100 is connected between the live wire L and zero line N of AC power of input, after will the alternating voltage of input transforming, is transferred to optocoupler 200;
Optocoupler 200 connects the output of input voltage modular converter 100, after the isolation of the voltage signal of input, transforming, forms square wave and is transferred to MCU detection module 300;
300 I/O pins by the MCU chip of MCU Check processing module receive, obtain the voltage signal of optocoupler 200 transmission, the cycle T of the square wave that the MCU chip forms according to this voltage signal again judges that whether the AC supply voltage of current input is too high: when the cycle T of the square wave formed when this voltage signal is less than default voltage cycle threshold value t, the AC supply voltage of determining current input is too high, and control stops powering to air-conditioner outdoor unit.
In the specific implementation process, the size of default voltage cycle threshold value t is relevant by the cycle T 1 of electric power system input power with the civil power under the air-conditioner environment for use or work, as preferably, the value of default voltage cycle threshold value t generally will input power cycle T 1 1/4 between the cycle T 1 of input power.Take domestic air conditioner as example, and the frequency of mains-supplied system input power is 50HZ, therefore its cycle T 1 is 20ms, voltage cycle threshold value t can be set as 5ms to any value between 20ms.
Formation and operation principle below by several specific embodiments to this AC overvoltage checkout gear describe.Fig. 3, Fig. 5 and Fig. 7 are respectively the structure charts of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model first, second, and third embodiment; For convenience of explanation, all only show the part relevant to embodiment itself.
Referring to Fig. 3, input voltage modular converter 100 comprises resistance R 1, resistance R 2 and Zener diode D1; The live wire L of the first termination AC power of resistance R 1, the second end of resistance R 1 connects the anode of Zener diode D1 and the first end of resistance R 2 simultaneously, the zero line N of the second termination AC power of resistance R 2, the negative electrode of Zener diode D1 connects the first input end mouth 1 of optocoupler 200LED side; The second input port 2 of optocoupler 200LED side also meets the zero line N of AC power, and the colelctor electrode port 4 of optocoupler 200 outputs meets DC voltage VCC, and the emitter stage port 3 of optocoupler 200 outputs connects an I/O pin of MCU chip in MCU Check processing module 300; Simultaneously, the emitter stage port 3 of optocoupler 200 outputs is by resistance R 4 ground connection.
The AC overvoltage checkout gear that the present embodiment provides is in concrete application, can determine by the parameter of adjusting the components and parts in input voltage modular converter 100 the threshold value U of input voltage, the voltage stabilizing value V of the resistance r2 of the resistance r1 by adjusting resistance R1, resistance R 2 or Zener diode D1 changes the size of threshold voltage U, and its specific formula for calculation is U=(V+0.7) * (r1+r2)/r2.
Give an example, suppose the voltage stabilizing value V=24V of Zener diode D1 in Fig. 3, resistance r1=100K ohm of resistance R 1, resistance r2=7.5k ohm of resistance R 2, and resistance r4=10k ohm of resistance R 4, the size of threshold voltage U is U=(V+0.7) * (r1+r2)/r2=(24+0.7) * (100+7.5)/7.5=354V, and in advance voltage cycle threshold value t is set as to 16ms.
In the specific works process, when the crest voltage U1 of AC power of input is less than 354V: in the positive half period of the AC power of input, optocoupler 200 can conducting; In the negative half-cycle of the AC power of inputting, optocoupler 200 can not conducting, now input the square wave (Fig. 4 a is the waveform schematic diagram of AC power of input) as shown in Figure 4 b of the voltage of MCU chip I/O pin, and now input the cycle T=20ms of the square wave of MCU chip I/O pin, now the cycle T of square wave is greater than cycle threshold values t(t=16ms), so judgement input voltage now is normal, air-conditioner can work.When the AC power crest voltage of input when being greater than 354V, at positive half period and the negative half-cycle of input power, optocoupler 200 can both conducting, now inputs the square wave of voltage of MCU chip I/O pin as shown in Fig. 4 c; And the supply voltage of input is larger, the cycle T of square wave is just less.Now; the square wave cycle T is about 12ms; be less than cycle threshold values t; therefore judge that the AC supply voltage of current input is too high; cut off the power supply of off-premises station by the MCU chip controls; air-conditioner is out of service, thereby plays the effect of protecting off-premises station, preventing off-premises station circuit board element and each load damage.Further, the function of reporting the overvoltage fault can also be set, and show fault message on display board, obtain the duty of air-conditioner with reminding user.
Fig. 5 is the structure chart of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model the second embodiment; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
The difference of the present embodiment and the first embodiment only has been to change the connected mode of optocoupler 200 with MCU Check processing module 300.Specifically, the colelctor electrode port 4 of optocoupler 200 outputs connects the I/O pin of MCU chip, and simultaneously, the colelctor electrode port 4 of optocoupler 200 outputs meets DC voltage VCC by a resistance R 5, emitter stage port 3 ground connection of optocoupler 200 outputs; The AC overvoltage structure of the detecting device that the connected mode of other devices and the first embodiment provide remains unchanged, and whether the AC supply voltage that can detect equally input is too high.
When specific implementation, the voltage that the alternating current input power supplying of supposing the air-conditioner of the AC overvoltage checkout gear that this second embodiment of employing provides is 100V, the frequency of input power is also 50HZ.Suppose the voltage stabilizing value V=24V of Zener diode D1 in Fig. 5, resistance r1=77K ohm of resistance R 1, resistance r2=14k ohm of resistance R 2, and resistance r5=10k ohm of resistance R 5.
The size of threshold voltage U is U=(V+0.7) * (r1+r2)/r2=(24+0.7) * (100+7.5)/7.5=354V, and in advance voltage cycle threshold value t is set as to 16ms.Because optocoupler 200 and the connected mode of MCU Check processing module 300 change, so the waveform of MCU chip I/square wave that the O Port detecting arrives also can be different, according to the above-mentioned parameter setting, the AC overvoltage checkout gear that this second embodiment adopts judges superpotential threshold values U=(V+0.7) * (r1+r2)/r2=(24+0.7) * (77+14)/14=160.5V, also voltage cycle threshold value t can be set as to 16ms simultaneously.
In the specific works process, when the crest voltage U1 of AC power of input is less than 160.5V: in the positive half period of the AC power of input, optocoupler 200 can conducting; In the negative half-cycle of the AC power of inputting, optocoupler 200 can not conducting, now input the square wave (Fig. 6 a is the waveform schematic diagram of AC power of input) as shown in Figure 6 b of the voltage of MCU chip I/O pin, and now input the cycle T=20ms of the square wave of MCU chip I/O pin, now the cycle T of square wave is greater than cycle threshold values t(t=16ms), so judgement input voltage now is normal, air-conditioner can work.When the AC power crest voltage of input when being greater than 160.5V, at positive half period and the negative half-cycle of input power, optocoupler 200 can both conducting, now inputs the square wave of voltage of MCU chip I/O pin as shown in Fig. 6 c; And the supply voltage of input is larger, the cycle T of square wave is just less.Now; the square wave cycle T is about 12ms; be less than cycle threshold values t; therefore judge that the AC supply voltage of current input is too high; cut off the power supply of off-premises station by the MCU chip controls; air-conditioner is out of service, thereby plays the effect of protecting off-premises station, preventing off-premises station circuit board element and each load damage.Same, the function of reporting the overvoltage fault also can further be set, and show fault message on display board, obtain the duty of air-conditioner with reminding user.
Fig. 7 is the structure chart of the AC overvoltage checkout gear of the air conditioner room unit that provides of the utility model the 3rd embodiment.For convenience of explanation, also only show the part relevant to the present embodiment,
The AC overvoltage checkout gear that this 3rd embodiment provides, the structure provided with the first embodiment is similar.As preferred embodiment, the reliability for the AC overvoltage checkout gear that improves the air conditioner room unit that the utility model provides, improve anti-interference, prevents false triggering, increased especially some anti-interference structures.As shown in Figure 7: on the basis of the first embodiment, increase by two ports of LED that a resistance R 3 is connected in parallel on two-way optocoupler, be about between zero line N that resistance R 3 is connected on the negative electrode of Zener diode D1 and AC power; Increase a resistance R 6, the two ends of resistance R 6 are connected on respectively the I/O pin of MCU chip and the emitter stage port 3 of optocoupler 200 outputs; Increase a capacitor C 1, be connected between the I/O pin and ground of MCU chip, the main application filtering clutter, improve the antijamming capability of whole checkout gear.And method of work, principle and the first embodiment that other overvoltage detect are similar, for example, the emitter stage port of optocoupler output also passes through resistance R 7 ground connection etc., at this, just repeats no more.
The utility model embodiment also provides a kind of air conditioner room unit, this kind of indoor set is built-in above-mentioned AC overvoltage checkout gear, when the AC supply voltage of outside input is too high, the MCU chip can stop the power supply to off-premises station, and points out the overvoltage fault on display board.
Finally, the utility model embodiment also provides a kind of air-conditioner, this air-conditioner comprises indoor set and off-premises station, described indoor set is the above-mentioned built-in indoor set of specific AC overvoltage checkout gear, when the AC supply voltage of outside input is too high, MCU chip in indoor set can stop the power supply to off-premises station, and points out the overvoltage fault on display board.
The air-conditioner provided according to the utility model, indoor set and AC overvoltage checkout gear thereof, increase a kind of AC overvoltage checkout gear on the basis of current air conditioner room unit, the operation principle of this circuit is mainly when the AC supply voltage of input changes, be different the rectangle wave period produced, thereby the size in the square wave cycle detected according to MCU Check processing module, whether the crest voltage that judges the AC power of current input is greater than threshold value: when the cycle of the voltage signal that input detected is less than default voltage cycle threshold value, the AC supply voltage of determining current input is too high, and control stops powering to air-conditioner outdoor unit, reach the effect of overvoltage protection.The composition of whole circuit is simple in structure, with low cost, and can detect by the common I/O pin of MCU chip, does not need to rely on A/D to detect mouth, has reduced to a great extent the A/D mouth resource requirement to the MCU chip.Because do not adopt the mode of AD sampling to detect AC overvoltage, so do not exist because AC-input voltage changes, do not cause that reference voltage changes the shortcoming that causes detected alternating voltage error.Further adopted the method for two-way light-coupled isolation, solved alternating voltage detection in the past and do not possessed the shortcoming of isolation effect, but also do not needed the devices such as Schmidt trigger, rp-drive are installed, simple in structure, easily to install, cost is also lower.In actual production and use procedure, according to the different parameters such as kind, model and the environment for use change voltage threshold of air-conditioner, also be easy to realize, be conducive to promotion and application on a large scale.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, although with reference to previous embodiment, the utility model has been carried out to more detailed explanation, for a person skilled in the art, its technical scheme that still can put down in writing aforementioned each embodiment is modified or part technical characterictic wherein is equal to replacement.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims (8)

1. the AC overvoltage checkout gear of an air conditioner room unit, is characterized in that, described AC overvoltage checkout gear comprises:
Be connected between the live wire L and zero line N of AC power of input, be transferred to the input voltage modular converter of subsequent conditioning circuit module after will input voltage transforming;
Be connected to the output of described input voltage modular converter, the voltage signal of input be transferred to the optocoupler of MCU detection module;
Obtain the voltage signal of described optocoupler transmission by the I/O pin of MCU chip, the cycle T of the square wave formed according to this voltage signal judges that whether the AC supply voltage of current input is too high: when the cycle T of the square wave formed when this voltage signal is less than default voltage cycle threshold value t, the AC supply voltage of determining current input is too high, and controls the MCU Check processing module stopped to the air-conditioner outdoor unit power supply.
2. the AC overvoltage checkout gear of air conditioner room unit as claimed in claim 1, it is characterized in that: described input voltage modular converter comprises resistance R 1, resistance R 2 and Zener diode D1;
The live wire L of the first termination AC power of described resistance R 1, the second end of described resistance R 1 connects the anode of described Zener diode D1 and the first end of described resistance R 2 simultaneously, the zero line N of the second termination AC power of described resistance R 2, the negative electrode of described Zener diode D1 connects the first input end mouth of described optocoupler LED side.
3. the AC overvoltage checkout gear of air conditioner room unit as claimed in claim 2, it is characterized in that: described input voltage modular converter also comprises resistance R 3;
Described resistance R 3 is connected between the zero line N of the negative electrode of described Zener diode D1 and AC power.
4. the AC overvoltage checkout gear of air conditioner room unit as claimed in claim 2 or claim 3 is characterized in that:
The second input port of described optocoupler LED side meets the zero line N of AC power, and the colelctor electrode port of described optocoupler output meets DC voltage VCC, and the emitter stage port of described optocoupler output connects the I/O pin of described MCU chip; Simultaneously, the emitter stage port of described optocoupler output is by resistance R 4 ground connection.
5. the AC overvoltage checkout gear of air conditioner room unit as claimed in claim 2 or claim 3 is characterized in that:
The second input port of described optocoupler LED side meets the zero line N of AC power; The colelctor electrode port of described optocoupler output connects the I/O pin of described MCU chip, and simultaneously, the colelctor electrode port of described optocoupler output meets DC voltage VCC by a resistance R 5, the emitter stage port ground connection of described optocoupler output.
6. the AC overvoltage checkout gear of air conditioner room unit as claimed in claim 3 is characterized in that:
The second input port of described optocoupler LED side meets the zero line N of AC power, and the colelctor electrode port of described optocoupler output meets DC voltage VCC, and the emitter stage port of described optocoupler output connects the I/O pin of described MCU chip by a resistance R 6; Simultaneously, the emitter stage port of described optocoupler output is by resistance R 7 ground connection, and the I/O pin of described MCU chip is by capacitor C 1 ground connection.
7. an air conditioner room unit, is characterized in that, described indoor set comprises AC overvoltage checkout gear as described as claim 1-6 any one.
8. an air-conditioner, comprise indoor set and off-premises station, it is characterized in that, described indoor set is indoor set as claimed in claim 7.
CN201320230206.4U 2013-04-28 2013-04-28 Air conditioner, indoor unit and alternating current overvoltage detection device of indoor unit Withdrawn - After Issue CN203385141U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104110763B (en) * 2013-04-28 2017-02-08 广东美的制冷设备有限公司 Air conditioner, indoor unit and alternating-current overvoltage detection device thereof
CN107246703A (en) * 2016-11-18 2017-10-13 奥克斯空调股份有限公司 A kind of air-conditioning with error connection defencive function
CN109239446A (en) * 2018-08-03 2019-01-18 广东美的制冷设备有限公司 AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104110763B (en) * 2013-04-28 2017-02-08 广东美的制冷设备有限公司 Air conditioner, indoor unit and alternating-current overvoltage detection device thereof
CN107246703A (en) * 2016-11-18 2017-10-13 奥克斯空调股份有限公司 A kind of air-conditioning with error connection defencive function
CN109239446A (en) * 2018-08-03 2019-01-18 广东美的制冷设备有限公司 AC overvoltage detection circuit, air conditioner, internal machine of air-conditioner and its control panel

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