WO2019024691A1 - 保护电路及空调 - Google Patents

保护电路及空调 Download PDF

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Publication number
WO2019024691A1
WO2019024691A1 PCT/CN2018/096407 CN2018096407W WO2019024691A1 WO 2019024691 A1 WO2019024691 A1 WO 2019024691A1 CN 2018096407 W CN2018096407 W CN 2018096407W WO 2019024691 A1 WO2019024691 A1 WO 2019024691A1
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WO
WIPO (PCT)
Prior art keywords
resistor
switch
signal
temperature coefficient
protection circuit
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PCT/CN2018/096407
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English (en)
French (fr)
Inventor
程绍江
王军
袁本海
时斌
Original Assignee
青岛海尔空调电子有限公司
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Application filed by 青岛海尔空调电子有限公司 filed Critical 青岛海尔空调电子有限公司
Priority to ES18841368T priority Critical patent/ES2945767T3/es
Priority to EP18841368.6A priority patent/EP3565076B1/en
Publication of WO2019024691A1 publication Critical patent/WO2019024691A1/zh
Priority to US16/546,235 priority patent/US11512860B2/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/32—Details or features not otherwise provided for preventing human errors during the installation, use or maintenance, e.g. goofy proof

Definitions

  • the invention relates to the technical field of air conditioners, and in particular to a protection circuit and an air conditioner.
  • air conditioning has gradually become a necessity in daily life.
  • the indoor unit and the outdoor unit are required to cooperate to realize cooling and heating.
  • the general practice is to divide the power socket and the communication socket into two.
  • the wiring personnel can identify the socket to complete the wiring work.
  • the situation of miswiring is reduced to a certain extent, once the misconnection occurs. It is still possible to cause damage to the indoor unit.
  • the embodiment of the invention provides a protection circuit and an air conditioner, which protects the indoor unit.
  • the embodiment of the invention provides a protection circuit, including:
  • the first end of the positive temperature coefficient thermistor is connected to the signal input end, and the second end of the positive temperature coefficient thermistor is connected to the communication module.
  • protection circuit further includes:
  • control unit comprising a signal detection interface and a control signal output interface
  • a first end of the switch is connected to a first end of the PTC thermistor, a second end of the switch is connected to a second end of the PTC thermistor, and a third end of the switch is connected
  • the second end of the positive temperature coefficient thermistor is connected to the signal detecting interface
  • the control signal output interface outputs a signal for controlling the closing of the switch when the signal detecting interface detects the communication signal
  • the control signal output interface outputs a signal for controlling the switch to be turned off when the signal detection interface does not detect the communication signal.
  • the positive temperature coefficient thermistor comprises a first positive temperature coefficient thermistor and a second positive temperature coefficient thermistor;
  • the switch includes a first switch and a second switch
  • the signal input end includes a first signal input end and a second signal input end
  • the signal detection interface includes a first signal detection interface and a second signal detection interface
  • a first end of the first positive temperature coefficient thermistor is connected to the first signal input end, and a second end of the first positive temperature coefficient thermistor is connected to the first signal detecting interface; a first end of the positive temperature coefficient thermistor is connected to the second signal input end, and a second end of the second positive temperature coefficient thermistor is connected to the second signal detecting interface;
  • a first end of the first switch is connected to a first end of the first PTC thermistor, and a second end of the first switch is connected to a second end of the first PTC thermistor, The third end of the first switch is connected to the control signal output interface;
  • a first end of the second switch is connected to a first end of the second positive temperature coefficient thermistor, and a second end of the second switch is connected to a second end of the second positive temperature coefficient thermistor, The third end of the second switch is connected to the control signal output interface.
  • a switch control module is disposed between the control signal output interface and the third end of the switch;
  • the switch control module is configured to output a signal for controlling the closing of the switch when receiving a signal output by the control signal output interface for controlling the closing of the switch;
  • the switch control module is configured to output a signal for controlling the switch to be turned off when receiving a signal output by the control signal output interface for controlling the switch to be turned off.
  • switch control module includes: a triode, a diode
  • the first end of the triode is connected to the control signal output interface
  • the second end of the triode is grounded
  • the third end of the transistor is connected to the second end of the diode
  • a first end of the diode is coupled to a third end of the switch.
  • the protection circuit further includes: a first resistor, a second resistor, and a third resistor;
  • the first end of the first resistor is connected to the second end of the first positive temperature coefficient thermistor
  • the second end of the first resistor is connected to the first end of the second resistor
  • the second end of the second resistor is grounded
  • the second end of the second resistor is further connected to the first end of the third resistor
  • the second end of the third resistor is coupled to the first signal detection interface.
  • the protection circuit further includes: a fourth resistor, a fifth resistor, and a sixth resistor;
  • the first end of the fourth resistor is connected to the second end of the second positive temperature coefficient thermistor
  • the second end of the fourth resistor is connected to the first end of the fifth resistor
  • the second end of the fifth resistor is grounded
  • the second end of the fifth resistor is further connected to the first end of the sixth resistor
  • the second end of the sixth resistor is coupled to the second signal detection interface.
  • the protection circuit further includes: a seventh resistor
  • the first end of the seventh resistor is connected to the control signal output interface
  • the second end of the seventh resistor is coupled to the first end of the transistor.
  • the protection circuit further includes: an eighth resistor;
  • the first end of the eighth resistor is connected to the first end of the triode
  • the second end of the eighth resistor is grounded.
  • An embodiment of the present invention provides an air conditioner, comprising: the protection circuit according to any one of the preceding claims.
  • the protection circuit provided by the embodiment of the invention, when the signal input terminal inputs the communication signal, because the communication signal is a low level signal, the positive temperature coefficient thermistor exhibits a low resistance state, which can allow the communication signal to flow in; when the signal input terminal inputs the power supply In the signal, since the power supply signal is a high level signal, the positive temperature coefficient thermistor exhibits a high resistance state and can block the inflow of the power supply signal. Therefore, in the embodiment of the present invention, the characteristics of the positive temperature coefficient thermistor are utilized.
  • the utility model not only blocks the power supply signal when the wiring is mistaken, but also turns on the corresponding communication signal during the normal wiring, thereby protecting the indoor unit and solving the problem that the prior art misconnection can cause damage to the indoor unit.
  • FIG. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a protection circuit according to an embodiment of the present invention.
  • FIG. 3 is another schematic structural diagram of a protection circuit according to an embodiment of the present invention.
  • FIG. 4 is another schematic structural diagram of a protection circuit according to an embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, as shown in FIG.
  • the parallel connection is used to communicate with the outdoor unit at the same time.
  • the power lines of the outdoor unit are respectively connected to a plurality of indoor units, and each indoor unit is powered by the power line.
  • an embodiment of the present invention provides a protection circuit.
  • the protection circuit in the embodiment of the present invention may include: a positive temperature coefficient (PTC) thermistor and a signal input. And a communication module, and the first end of the positive temperature coefficient thermistor is connected to the signal input end, and the second end of the positive temperature coefficient thermistor is connected to the communication module.
  • PTC positive temperature coefficient
  • the PTC thermistor is a typical temperature-sensitive semiconductor resistor, when it exceeds a certain temperature (Curie temperature), its resistance value increases stepwise with an increase in temperature, and thus, in the practice of the present invention
  • the input when the signal input end is connected with the communication line, the input is the communication signal, the current of the communication signal is small, the PTC thermistor maintains the original resistance value, and the resistance value is small, which does not affect the normal operation of the circuit, so that the communication
  • the module can receive the communication signal input by the signal input end.
  • the input is the power supply signal
  • the current of the power-on signal is large, the temperature of the PTC thermistor rises, and the resistance value rises sharply.
  • the current is blocked, and the communication module cannot receive the signal input from the signal input terminal, thereby protecting the components of the indoor unit circuit, such as the communication module.
  • the power supply signal can be blocked at the time of miswired, and the corresponding communication signal can be turned on during normal wiring, thereby playing a role in the indoor unit.
  • the protection function solves the problem that the prior art misconnection can cause damage to the indoor unit.
  • FIG. 3 is another schematic structural diagram of the protection circuit according to the embodiment of the present invention. As shown in FIG. 3, the protection circuit of the embodiment of the present invention further includes: a control unit.
  • the control unit comprises a signal detection interface O and a control signal output interface S, the first end of the switch is connected to the first end of the PCT thermistor, and the second end of the switch is connected to the second end of the PCT thermistor, the switch
  • the three-terminal connection control signal output interface S, the second end of the PCT thermistor is connected to the signal detection interface O.
  • the control unit may be an MCU (Microcontroller Unit) for detecting signals in the circuit, processing the signals, and outputting corresponding signals according to the detected signals.
  • the switch may be a relay, the signal detecting interface O is used for detecting a signal, and the control signal output interface S is outputting a control signal by the user.
  • the signal detecting interface O detects the communication signal, it indicates that the signal input terminal is connected with a signal. Line, the control signal output interface S outputs a signal for controlling the closing of the switch. After the switch is closed, the PTC thermistor is short-circuited.
  • the signal detecting interface O does not detect the communication signal, the power supply line connected to the signal input section is explained. At this time, it is necessary to ensure that the PTC thermistor works normally, and the control signal output interface S outputs a signal for controlling the switch to be turned off, and the PTC thermistor works normally to block the power supply signal.
  • FIG. 4 is another protection circuit provided by an embodiment of the present invention.
  • the positive temperature coefficient thermistor comprises a first positive temperature coefficient thermistor PTC1 and a second positive temperature coefficient thermistor.
  • the PTC2; the switch includes a first switch K1 and a second switch K2.
  • the signal input end includes a first signal input terminal A and a second signal input terminal B.
  • the signal detection interface includes a first signal detection interface OA and a second signal detection interface OB.
  • the first end of the first positive temperature coefficient thermistor PTC1 is connected to the first signal input end A, and the second end of the first positive temperature coefficient thermistor PTC1 is connected to the first signal detecting interface OA; the second positive temperature coefficient heat The first end of the first PTC1 is connected to the second signal input terminal B, and the second end of the second positive temperature coefficient thermistor PTC1 is connected to the second signal detecting interface OB; the first end of the first switch K1 is connected to the first positive temperature coefficient The first end of the thermistor PTC1, the second end of the first switch K1 is connected to the second end of the first positive temperature coefficient thermistor PTC1, the third end of the first switch K1 is connected to the control signal output interface S; the second switch The first end of K2 is connected to the first end of the second positive temperature coefficient thermistor PTC2, the second end of the second switch K2 is connected to the second end of the second positive temperature coefficient thermistor PTC2, and the third end of the second switch K2 The terminal is
  • the circuit shown in FIG. 4 is used in the same manner as the circuit shown in FIG. 3, and is not described here.
  • the difference is that in the embodiment of the present invention, the interface OA and the second signal are detected by the first signal.
  • the detection interface OB detects the communication signal at the same time.
  • the control unit can determine whether the signal input terminal is a pulse signal according to the communication signal detected by the first signal detection interface OA and the second signal detection interface OB, and when it is determined as a pulse signal.
  • the control unit outputs a signal for controlling the closing of the switch through the control signal output interface S. At this time, the first switch K1 and the second switch K2 are simultaneously closed.
  • the control unit When the first signal detecting interface OA and the second signal detecting interface OB in the control unit do not detect the communication signal, the control unit outputs a signal for controlling the opening of the switch through the control signal output interface S. At this time, the first switch K1 and the second switch K2 are simultaneously disconnected to ensure normal operation of PTC1 and PTC2.
  • the signal output from the control signal output interface S is also a lower voltage signal. Therefore, in the embodiment of the present invention, the signal output from the control signal output interface S can be output through the switch control module.
  • the amplification is used to control the operation of the switch.
  • a switch control module is disposed between the control signal output interface and the third end of the switch.
  • the switch control module is configured to output a signal for controlling the switch closure when receiving the signal output by the control signal output interface S for controlling the switch closure; the switch control module is configured to receive the output of the control signal output interface S for When the signal that controls the switch is turned off, the signal for controlling the switch to open is output.
  • the switch control module includes: a triode, a diode.
  • the first end of the triode is connected to the control signal output interface S; the second end of the triode is grounded; the third end of the triode is connected to the second end of the diode; and the first end of the diode is connected to the third end of the switch.
  • the second end of the diode is further provided with a 5V reference voltage, and may also be other reference voltage values in practical applications.
  • the first switch K1 and the second switch K2 are in an off state by default. When the switch needs to be closed, the control signal output interface S outputs a low level signal, and the low level signal is input to the first end of the transistor.
  • the voltage of the first end of the triode is higher than the voltage of the third end of the triode 0V, the triode is turned on, and then the level signal amplified by the triode is input to the second end of the diode, and the first end of the diode corresponds to a reference voltage of 5V, passing through the triode
  • the difference between the voltage value of the amplified level signal and the voltage value of the reference voltage cannot make the diode conduct, the coil of the third end of the switch stops generating the magnetic induction signal, and the first switch K1 and the second switch K2 are simultaneously closed.
  • the control signal output interface S When the switch needs to be disconnected, the control signal output interface S outputs a high level signal, and the high level signal is input to the first end of the triode, the voltage of the first end of the triode is higher than the voltage of the third end of the triode 0V, and the triode is turned on. Then, the level signal amplified by the triode is input to the second end of the diode, and the reference voltage corresponding to the first end of the diode is 5V, and the difference between the voltage value of the level signal amplified by the triode and the voltage value of the reference voltage makes the diode lead
  • the coil of the third end of the switch generates a magnetic induction signal, and the first switch K1 and the second switch K2 are simultaneously disconnected.
  • the protection circuit in the embodiment of the present invention further includes a first resistor R1, a second resistor R2, and a third resistor R3.
  • the first end of the first resistor R1 is connected to the first positive temperature coefficient thermistor PTC1.
  • the second end of the first resistor R1 is connected to the first end of the second resistor R2; the second end of the second resistor R2 is grounded; the second end of the second resistor R2 is further connected to the first end of the third resistor R3
  • the second end of the third resistor R3 is connected to the first signal detecting interface 0A.
  • the first resistor R1 and the third resistor R3 function as a voltage divider, and the second resistor R2 functions as a protection.
  • the protection circuit in the embodiment of the present invention further includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
  • the first end of the fourth resistor R4 is connected to the second positive temperature coefficient thermistor PTC2. a second end; the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5; the second end of the fifth resistor R5 is grounded; the second end of the fifth resistor R5 is further connected to the first end of the sixth resistor R6 The second end of the sixth resistor R6 is connected to the second signal detecting interface OB.
  • the fourth resistor R4 and the sixth resistor R6 function as a voltage divider, and the fifth resistor R5 functions as a protection.
  • the protection circuit in the embodiment of the present invention further includes a seventh resistor R7.
  • the first end of the seventh resistor R7 is connected to the control signal output interface S.
  • the second end of the seventh resistor R7 is connected to the first end of the transistor. .
  • the seventh resistor R7 functions as a partial pressure.
  • the protection circuit in the embodiment of the present invention further includes an eighth resistor R8.
  • the first end of the eighth resistor R8 is connected to the first end of the transistor; the second end of the eighth resistor R8 is grounded.
  • the eighth resistor R8 functions as a protection.
  • an embodiment of the present invention further provides an air conditioner, which includes any one of the foregoing protection circuits.
  • the implementation principle and technical effects are as shown in the foregoing, and are not described herein again.
  • the device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. Or it can be distributed to at least two network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

一种保护电路及空调，该保护电路包括：正温度系数热敏电阻；信号输入端；通信模块；正温度系数热敏电阻的第一端连接信号输入端，正温度系数热敏电阻的第二端连接通信模块。该保护电路可对空调的室内机起到保护作用。

Description

保护电路及空调
本申请基于申请号为201710648369.7、申请日为2017年8月1日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及空调技术领域，尤其涉及一种保护电路及空调。
背景技术
空调作为一种空气调节设备，已逐渐成为人们日常生活必需品。空调在使用过程中，需要室内机与室外机相互配合，实现制冷和制热。
由于空调安装复杂，误配线情况在所难免，由于一台空调外机可以允许连接至少一台空调室内机，由于室内机需要正确配置电源线和通信线，因此一旦出现配线失误，220V/380V强电信号就会接入到通讯线上，从而导致所有的室内机全部出现损坏，经济损失较大。
目前一般的做法是将电源插座与通讯插座分为两个，由配线人员来识别插座来完成配线工作，虽然在一定程度上减少了误接线的情况出现，但是一旦出现了误接线的情况，仍然有可能会导致室内机损坏。
发明内容
本发明实施例提供一种保护电路及空调，对室内机起到了保护作用。
本发明实施例提供一种保护电路，包括：
正温度系数热敏电阻；
信号输入端；
通信模块；
所述正温度系数热敏电阻的第一端连接所述信号输入端，所述正温度系数热敏电阻的第二端连接所述通信模块。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述保护电路还包括：
控制单元，所述控制单元包括信号检测接口与控制信号输出接口；
开关；
所述开关的第一端连接所述正温度系数热敏电阻的第一端，所述开关的第二端连接所述正温度系数热敏电阻的第二端，所述开关的第三端连接所述控制信号输出接口；
所述正温度系数热敏电阻的第二端连接所述信号检测接口；
当信号检测接口检测到通信信号时，所述控制信号输出接口输出用于控制开关闭合的信号；
当信号检测接口未检测到通信信号时，所述控制信号输出接口输出用于控制开关断开的信号。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述正温度系数热敏电阻，包括第一正温度系数热敏电阻、第二正温度系数热敏电阻；
所述开关包括第一开关、第二开关；
所述信号输入端包括第一信号输入端、第二信号输入端；
所述信号检测接口包括第一信号检测接口、第二信号检测接口；
所述第一正温度系数热敏电阻的第一端连接所述第一信号输入端，所述第一正温度系数热敏电阻的第二端连接所述第一信号检测接口；所述第二正温度系数热敏电阻的第一端连接所述第二信号输入端，所述第二正温度系数热敏电阻的第二端连接所述第二信号检测接口；
所述第一开关的第一端连接所述第一正温度系数热敏电阻的第一端，所述第一开关的第二端连接所述第一正温度系数热敏电阻的第二端，所述第一开关的第三端连接所述控制信号输出接口；
所述第二开关的第一端连接所述第二正温度系数热敏电阻的第一端，所述第二开关的第二端连接所述第二正温度系数热敏电阻的第二端，所述第二开关的第三端连接所述控制信号输出接口。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述控制信号输出接口与所述开关的第三端之间设置有开关控制模块；
所述开关控制模块用于在接收到控制信号输出接口输出的用于控制开关闭合的信号时，输出用于控制开关闭合的信号；
所述开关控制模块用于在接收到控制信号输出接口输出的用于控制开关断开的信号时，输出用于控制开关断开的信号。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述开关控制模块包括：三极管、二极管；
所述三极管的第一端连接所述控制信号输出接口；
所述三极管的第二端接地；
所述三极管的第三端连接所述二极管的第二端；
所述二极管的第一端连接所述开关的第三端。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述保护电路还包括：第一电阻、第二电阻、第三电阻；
所述第一电阻的第一端连接所述第一正温度系数热敏电阻的第二端；
所述第一电阻的第二端连接所述第二电阻的第一端；
所述第二电阻的第二端接地；
所述第二电阻的第二端还连接所述第三电阻的第一端；
所述第三电阻的第二端连接所述第一信号检测接口。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述保护电路还包括：第四电阻、第五电阻、第六电阻；
所述第四电阻的第一端连接所述第二正温度系数热敏电阻的第二端；
所述第四电阻的第二端连接所述第五电阻的第一端；
所述第五电阻的第二端接地；
所述第五电阻的第二端还连接所述第六电阻的第一端；
所述第六电阻的第二端连接所述第二信号检测接口。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述保护电路还包括：第七电阻；
所述第七电阻的第一端连接所述控制信号输出接口；
所述第七电阻的第二端连接所述三极管的第一端。
如上所述的方面和任一可能的实现方式，进一步提供一种实现方式，所述保护电路还包括：第八电阻；
所述第八电阻的第一端连接所述三极管的第一端；
所述第八电阻的第二端接地。
本发明实施例还提供一种空调，包括：如前述内容中任一项所述的保护电路。
本发明实施例提供的保护电路，当信号输入端输入通信信号时，由于通信信号为低电平信号，正温度系数热敏电阻呈现低阻状态，能够允许通信信号流入；当信号输入端输入供电信号时，由于供电信号为高电平信号，正温度系数热敏电阻呈现高阻状态，能够阻断供电信号的流入，因此，在本发明实施例中，利用正温度系数热敏电阻的特性，既能在误接线的时候阻断供电信号，又能在正常接线的时候导通相应的通信信号，对室内机起到了保护作用，解决了现有技术中误接线会造成室内机损坏的问题。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例空调组成结构示意图；
图2为本发明实施例提供的保护电路的结构示意图；
图3为本发明实施例提供的保护电路的另一结构示意图；
图4为本发明实施例提供的保护电路的另一结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在本发明实施例中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本发明。在本发明实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。
应当理解，本文中使用的术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
现有技术中，空调包括室内机和室外机，室内机与室外机之间通过通讯线来完成通信，图1为本发明实施例空调组成结构示意图，如图1所示，多个室内机之间采用并联的方式连接，可以同时与室外机进行通信，与此同时，室外机的电源线分别与多个室内机连接，通过电源线为每个室内机供电。在该种情况下，一旦出现通讯线与电源线之间短路或者通讯线与电源线接错，就会损坏室内机，因此，为了解决这个问题，本发明实施例提供一种保护电路，具体的，图2为本发明实施例提供的保护电路的结构示意图，如图2所示，本发明实施例中的保护电路，可以包括：正温度系数(Positive Temperature Coefficient，PTC)热敏电阻、信号输入端、通信模块，并且，正温度系数热敏电阻的第一端连接信号输入端，正温度系数热敏电阻的第二端连接通信模块。
由于PTC热敏电阻是一种典型具有温度敏感性的半导体电阻，在超过一定的温度(居里温度)时，它的电阻值随着温度的升高呈阶跃性的增高，因此，在本发明实施例中，当信号输入端与通讯线连接时，输入的是通讯信号，通讯信号的电流较小，PTC热敏电阻保持原阻值，阻值很小，不会影响电路的正常工作，使得通信模块可以接收到信号输入端输入的通讯信号，当信号输入端与电源线连接时，输入的是供电信号，通电信号的电流较大，PTC热敏电阻温度升高，阻值随之急剧升高，使得电流被阻断，通信模块无法接收到信号输入端输入的信号，从而保护了室内机电路的器件，例如通讯模块。
因此，在本发明实施例中，利用正温度系数热敏电阻的特性，既能在误接线的时候阻断供电信号，又能在正常接线的时候导通相应的通信 信号，对室内机起到了保护作用，解决了现有技术中误接线会造成室内机损坏的问题。
进一步地，由于PTC热敏电阻存在一定的阻值，一定程度上，会影响信号输入端输入的通讯信号的传播距离，因此，在本发明实施例中，当确定了室内机电路连接正常时，可以利用如下部件将PCT热敏电阻短接，具体的，图3为本发明实施例提供的保护电路的另一结构示意图，如图3所示，本发明实施例的保护电路还包括：控制单元和开关，控制单元包括信号检测接口O与控制信号输出接口S，开关的第一端连接PCT热敏电阻的第一端，开关的第二端连接PCT热敏电阻的第二端，开关的第三端连接控制信号输出接口S，PCT热敏电阻的第二端连接信号检测接口O。
其中，控制单元可以是MCU(Microcontroller Unit，微控制单元)，用于检测电路中的信号、对信号进行处理，以及，根据检测到的信号输出相应的信号。在本发明实施例中，开关可以是继电器，信号检测接口O用于检测信号，控制信号输出接口S用户输出控制信号，当信号检测接口O检测到通信信号时，说明信号输入端连接的是信号线，控制信号输出接口S输出用于控制开关闭合的信号，在开关闭合后，将PTC热敏电阻短接，当信号检测接口O未检测到通信信号时，说明信号输入段连接的电源线，此时需要保证PTC热敏电阻正常工作，控制信号输出接口S输出用于控制开关断开的信号，PTC热敏电阻正常工作，将供电信号阻断。
前述内容中，采用的是利用单一线路检测通信信号，在本发明实施例中，还可以使用多条线路检测通信信号的方式，具体的，图4为本发明实施例提供的保护电路的另一结构示意图，如图4所示，本发明实施例的保护电路，在前述内容的基础上，正温度系数热敏电阻，包括第一正温度系数热敏电阻PTC1、第二正温度系数热敏电阻PTC2；开关包括第一开关K1、第二开关K2，信号输入端包括第一信号输入端A、第二信号输入端B，信号检测接口包括第一信号检测接口OA、第二信号检测接口OB。
其中，第一正温度系数热敏电阻PTC1的第一端连接第一信号输入端A，第一正温度系数热敏电阻PTC1的第二端连接第一信号检测接口OA； 第二正温度系数热敏电阻PTC2的第一端连接第二信号输入端B，第二正温度系数热敏电阻PTC1的第二端连接第二信号检测接口OB；第一开关K1的第一端连接第一正温度系数热敏电阻PTC1的第一端，第一开关K1的第二端连接第一正温度系数热敏电阻PTC1的第二端，第一开关K1的第三端连接控制信号输出接口S；第二开关K2的第一端连接第二正温度系数热敏电阻PTC2的第一端，第二开关K2的第二端连接第二正温度系数热敏电阻PTC2的第二端，第二开关K2的第三端连接控制信号输出接口S。
采用图4所示的电路，其实现原理与前述图3所示的电路的原理相同，此处不在进行赘述，区别在于，在本发明实施例中，通过第一信号检测接口OA、第二信号检测接口OB同时检测通讯信号，此时控制单元可以根据第一信号检测接口OA、第二信号检测接口OB同时检测到的通讯信号确定信号输入端输入的是否为脉冲信号，当确定为脉冲信号时，控制单元通过控制信号输出接口S输出用于控制开关闭合的信号，此时，第一开关K1与第二开关K2同时闭合。而当控制单元中的第一信号检测接口OA、第二信号检测接口OB没有检测到通讯信号时，控制单元通过控制信号输出接口S输出用于控制开关断开的信号，此时，第一开关K1与第二开关K2同时断开，以保证PTC1和PTC2的正常工作。
由于控制单元多采用低电压或者低电流进行工作，控制信号输出接口S输出的信号也是较低电压信号，因此，在本发明实施例中，可以通过开关控制模块将控制信号输出接口S输出的信号放大，用于控制开关的工作，具体的，控制信号输出接口与开关的第三端之间设置有开关控制模块。
开关控制模块用于在接收到控制信号输出接口S输出的用于控制开关闭合的信号时，输出用于控制开关闭合的信号；开关控制模块用于在接收到控制信号输出接口S输出的用于控制开关断开的信号时，输出用于控制开关断开的信号。
在一个具体的实现过程中，开关控制模块包括：三极管、二极管。其中，三极管的第一端连接控制信号输出接口S；三极管的第二端接地；三极管的第三端连接二极管的第二端；二极管的第一端连接开关的第三 端。在本发明实施例中，二极管的第二端还设置有一个5V参考电压，在实际应用中还可以是其他参考电压值。在本发明实施例中，默认第一开关K1和第二开关K2为断开状态，当需要将开关闭合时，控制信号输出接口S输出低电平信号，低电平信号输入三极管的第一端，三极管的第一端的电压高于三极管第三端的电压0V，三极管导通，然后经过三极管放大的电平信号输入二极管的第二端，二极管的第一端对应的参考电压为5V，经过三极管放大的电平信号的电压值与参考电压的电压值之差，不能使得二极管导通，开关的第三端的线圈停止产生磁感应信号，第一开关K1和第二开关K2同时闭合。当需要将开关断开时，控制信号输出接口S输出高电平信号，高电平信号输入三极管的第一端，三极管的第一端的电压高于三极管第三端的电压0V，三极管导通，然后经过三极管放大的电平信号输入二极管的第二端，二极管的第一端对应的参考电压为5V，经过三极管放大的电平信号的电压值与参考电压的电压值之差，使得使得二极管导通，开关的第三端的线圈产生磁感应信号，第一开关K1和第二开关K2同时断开。
如图4所示，本发明实施例中的保护电路还包括第一电阻R1、第二电阻R2、第三电阻R3，第一电阻R1的第一端连接第一正温度系数热敏电阻PTC1的第二端；第一电阻R1的第二端连接第二电阻R2的第一端；第二电阻R2的第二端接地；第二电阻R2的第二端还连接第三电阻R3的第一端；第三电阻R3的第二端连接第一信号检测接口0A。其中，第一电阻R1和第三电阻R3起到分压的作用，第二电阻R2起到保护的作用。
如图4所示，本发明实施例中的保护电路还包括第四电阻R4、第五电阻R5、第六电阻R6，第四电阻R4的第一端连接第二正温度系数热敏电阻PTC2的第二端；第四电阻R4的第二端连接第五电阻R5的第一端；第五电阻R5的第二端接地；第五电阻R5的第二端还连接第六电阻R6的第一端；第六电阻R6的第二端连接第二信号检测接口OB。其中，第四电阻R4和第六电阻R6起到分压的作用，第五电阻R5起到保护的作用。
如图4所示，本发明实施例中的保护电路还包括第七电阻R7，第七电阻R7的第一端连接控制信号输出接口S；第七电阻R7的第二端连接三极管的第一端。在本发明实施例中，第七电阻R7起到分压的作用。
如图4所示，本发明实施例中的保护电路还包括第八电阻R8，第八电阻R8的第一端连接三极管的第一端；第八电阻R8的第二端接地。在本发明实施例中，第八电阻R8起到保护的作用。
前述内容中的电路为保护空调内部组件所需要的电路，因此，本发明实施例中还提供一种空调，空调中包括如前述内容中任意一种保护电路。且其实现原理以及技术效果如前述内容所示，此处不再进行赘述。
以上所描述的装置实施例仅仅是示意性的，其中作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到至少两个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (10)

  1. 一种保护电路，其特征在于，包括：
    正温度系数热敏电阻；
    信号输入端；
    通信模块；
    所述正温度系数热敏电阻的第一端连接所述信号输入端，所述正温度系数热敏电阻的第二端连接所述通信模块。
  2. 根据权利要求1所述的保护电路，其特征在于，所述保护电路还包括：
    控制单元，所述控制单元包括信号检测接口与控制信号输出接口；
    开关；
    所述开关的第一端连接所述正温度系数热敏电阻的第一端，所述开关的第二端连接所述正温度系数热敏电阻的第二端，所述开关的第三端连接所述控制信号输出接口；
    所述正温度系数热敏电阻的第二端连接所述信号检测接口；
    当信号检测接口检测到通信信号时，所述控制信号输出接口输出用于控制开关闭合的信号；
    当信号检测接口未检测到通信信号时，所述控制信号输出接口输出用于控制开关断开的信号。
  3. 根据权利要求2所述的保护电路，其特征在于，所述正温度系数热敏电阻，包括第一正温度系数热敏电阻、第二正温度系数热敏电阻；
    所述开关包括第一开关、第二开关；
    所述信号输入端包括第一信号输入端、第二信号输入端；
    所述信号检测接口包括第一信号检测接口、第二信号检测接口；
    所述第一正温度系数热敏电阻的第一端连接所述第一信号输入端，所述第一正温度系数热敏电阻的第二端连接所述第一信号检测接口；所述第二正温度系数热敏电阻的第一端连接所述第二信号输入端，所述第二正温度系数热敏电阻的第二端连接所述第二信号检测接口；
    所述第一开关的第一端连接所述第一正温度系数热敏电阻的第一 端，所述第一开关的第二端连接所述第一正温度系数热敏电阻的第二端，所述第一开关的第三端连接所述控制信号输出接口；
    所述第二开关的第一端连接所述第二正温度系数热敏电阻的第一端，所述第二开关的第二端连接所述第二正温度系数热敏电阻的第二端，所述第二开关的第三端连接所述控制信号输出接口。
  4. 根据权利要求2所述的保护电路，其特征在于，所述控制信号输出接口与所述开关的第三端之间设置有开关控制模块；
    所述开关控制模块用于在接收到控制信号输出接口输出的用于控制开关闭合的信号时，输出用于控制开关闭合的信号；
    所述开关控制模块用于在接收到控制信号输出接口输出的用于控制开关断开的信号时，输出用于控制开关断开的信号。
  5. 根据权利要求4所述的保护电路，其特征在于，所述开关控制模块包括：三极管、二极管；
    所述三极管的第一端连接所述控制信号输出接口；
    所述三极管的第二端接地；
    所述三极管的第三端连接所述二极管的第二端；
    所述二极管的第一端连接所述开关的第三端。
  6. 根据权利要求3所述的保护电路，其特征在于，所述保护电路还包括：第一电阻、第二电阻、第三电阻；
    所述第一电阻的第一端连接所述第一正温度系数热敏电阻的第二端；
    所述第一电阻的第二端连接所述第二电阻的第一端；
    所述第二电阻的第二端接地；
    所述第二电阻的第二端还连接所述第三电阻的第一端；
    所述第三电阻的第二端连接所述第一信号检测接口。
  7. 根据权利要求3所述的保护电路，其特征在于，所述保护电路还包括：第四电阻、第五电阻、第六电阻；
    所述第四电阻的第一端连接所述第二正温度系数热敏电阻的第二端；
    所述第四电阻的第二端连接所述第五电阻的第一端；
    所述第五电阻的第二端接地；
    所述第五电阻的第二端还连接所述第六电阻的第一端；
    所述第六电阻的第二端连接所述第二信号检测接口。
  8. 根据权利要求5所述的保护电路，其特征在于，所述保护电路还包括：第七电阻；
    所述第七电阻的第一端连接所述控制信号输出接口；
    所述第七电阻的第二端连接所述三极管的第一端。
  9. 根据权利要求5所述的保护电路，其特征在于，所述保护电路还包括：第八电阻；
    所述第八电阻的第一端连接所述三极管的第一端；
    所述第八电阻的第二端接地。
  10. 一种空调，其特征在于，包括：如权利要求1—9中任一项所述的保护电路。
PCT/CN2018/096407 2017-08-01 2018-07-20 保护电路及空调 WO2019024691A1 (zh)

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