CN104425184A - Control device for switching on and switching off relay and air conditioner - Google Patents
Control device for switching on and switching off relay and air conditioner Download PDFInfo
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- CN104425184A CN104425184A CN201310547174.5A CN201310547174A CN104425184A CN 104425184 A CN104425184 A CN 104425184A CN 201310547174 A CN201310547174 A CN 201310547174A CN 104425184 A CN104425184 A CN 104425184A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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Abstract
Description
技术领域technical field
本发明涉及继电器控制领域，尤其涉及一种继电器闭合、断开控制装置及空调。The invention relates to the field of relay control, in particular to a relay closing and opening control device and an air conditioner.
背景技术Background technique
现有技术中空调电脑板控制的负载一般可分为两种，感性负载和阻性负载；阻性负载主要类型有加热带；感性负载主要类型有电磁阀、交流接触器、交流风机等。The loads controlled by the air conditioner computer board in the prior art can generally be divided into two types, inductive loads and resistive loads; the main types of resistive loads are heating belts; the main types of inductive loads are solenoid valves, AC contactors, and AC fans.
一般由低压继电器控制强电感性负载，但继电器吸合、断开过程中，会产生尖峰电压，为了降低尖峰电压值，普遍采用阻容吸收回路进行匹配，通常的做法是在电脑板上装配阻容吸收回路，降低继电器闭合断开时尖峰电压，提高继电器的可靠性。具体控制电路如图1所示，继电器一端接火线，一端接感性负载的电流输入端口，阻容吸收回路与继电器并联，一端接火线，另一端接感性负载的电流输入端口，继电器通过断开或闭合来控制断感性负载，在继电器开或闭合时，会产生尖峰电压，阻容吸收回路即用来降低继电器闭合或断开时产生的尖峰电压。Generally, low-voltage relays control strong inductive loads, but peak voltages will be generated during the pull-in and disconnection of the relays. In order to reduce the peak voltage values, resistance-capacitance absorption circuits are generally used for matching. The usual practice is to assemble resistors on the computer board. The capacitive absorption circuit reduces the peak voltage when the relay is closed and disconnected, and improves the reliability of the relay. The specific control circuit is shown in Figure 1. One end of the relay is connected to the live wire, and the other end is connected to the current input port of the inductive load. Closing is used to control the breaking of inductive loads. When the relay is opened or closed, a peak voltage will be generated. The resistance-capacitance absorption circuit is used to reduce the peak voltage generated when the relay is closed or disconnected.
但是以上方案存在以下问题：But the above scheme has the following problems:
由于阻容回路是加在负载的两端，考虑到爬电距离等因素，导致阻容回路占用电脑板的空间较多，目前空调机组发展方向是小型化、便利安装，机组小型化的发展，注定了要求电控箱体尺寸缩小，因此电脑板的尺寸必须变小；但是由于阻容回路的存在，阻碍了电脑板的小型化发展。Since the resistance-capacitance circuit is added at both ends of the load, considering the creepage distance and other factors, the resistance-capacitance circuit takes up more space on the computer board. At present, the development direction of the air conditioning unit is miniaturization, convenient installation, and the development of miniaturization of the unit. It is doomed to require the size of the electronic control box to be reduced, so the size of the computer board must be reduced; but due to the existence of the resistance-capacitance circuit, the development of miniaturization of the computer board is hindered.
针对以上问题，亟需要一种新的继电器闭合、断开控制装置及空调。For above problem, need badly a kind of new relay closure, disconnection control device and air conditioner.
发明内容Contents of the invention
本发明的目的在于提供一种继电器闭合、断开控制装置，该控制装置可以降低继电器控制感性负载时导致的尖峰电压。The object of the present invention is to provide a relay closing and opening control device, which can reduce the peak voltage caused when the relay controls the inductive load.
该控制装置还可以去除阻容吸收硬件回路，利于电脑板的小型化和降低成本。The control device can also remove the resistance-capacity absorption hardware circuit, which is beneficial to the miniaturization and cost reduction of the computer board.
本发明的另一个目的在于提供了一种空调，该空调具有上述继电器闭合、断开控制装置，可以降低继电器控制感性负载断开或闭合导致的尖峰电压。Another object of the present invention is to provide an air conditioner, which has the above-mentioned relay closing and opening control device, which can reduce the peak voltage caused by the relay controlling the opening or closing of the inductive load.
该空调还可以去除阻容吸收回路，利于其内电脑板的小型化和降低成本。The air conditioner can also remove the resistance-capacitance absorption circuit, which is beneficial to the miniaturization and cost reduction of the internal computer board.
为达此目的，本发明采用以下技术方案：For reaching this purpose, the present invention adopts following technical scheme:
一种继电器闭合、断开控制装置，包括：A relay closing and opening control device, comprising:
控制单元、电源和继电器；control unit, power supply and relays;
所述电源与所述继电器电连接，所述电源与所述继电器之间并联有过零检测回路；所述过零检测回路检测所述电源的过零信号，并将所述过零信号传送给所述控制单元；The power supply is electrically connected to the relay, and a zero-crossing detection circuit is connected in parallel between the power supply and the relay; the zero-crossing detection circuit detects the zero-crossing signal of the power supply, and transmits the zero-crossing signal to said control unit;
所述控制单元与所述继电器的信号输入端相连，根据所述过零信号控制继电器断开或闭合。The control unit is connected to the signal input end of the relay, and controls the relay to open or close according to the zero-crossing signal.
作为优选，当控制单元检测到过零点检测电路产生的电平到达上升沿或者下降沿时，并保持至少第一预设时间T1后，确认该过零信号为有效信号。Preferably, when the control unit detects that the level generated by the zero-crossing detection circuit reaches a rising edge or a falling edge, and maintains it for at least a first preset time T1, it confirms that the zero-crossing signal is a valid signal.
作为优选，当控制单元确认所述过零信号为有效信号后且在第二预设时间T2内需要所述继电器断开或闭合时，控制单元控制继电器断开或闭合。Preferably, when the control unit confirms that the zero-crossing signal is a valid signal and the relay needs to be opened or closed within the second preset time T2, the control unit controls the relay to open or close.
作为优选，所述第一预设时间T1为500us；所述第二预设时间T2为500us。Preferably, the first preset time T1 is 500us; the second preset time T2 is 500us.
作为优选，所述继电器用于控制感性负载，所述继电器的电流输入端连接火线，继电器的电流输出端连接感性负载的电流输入端，所述感性负载的电流输出端连接零线。Preferably, the relay is used to control the inductive load, the current input end of the relay is connected to the live wire, the current output end of the relay is connected to the current input end of the inductive load, and the current output end of the inductive load is connected to the neutral wire.
作为优选，所述过零检测回路包括：光电耦合器、整流二极管、第一限流电阻；Preferably, the zero-crossing detection loop includes: a photocoupler, a rectifier diode, and a first current-limiting resistor;
所述光电耦合器由发光二极管和光敏三极管组成；其中，The photocoupler is made up of light-emitting diodes and phototransistors; wherein,
所述发光二极管的阳极连接火线，阴极连接零线；The anode of the light-emitting diode is connected to the live wire, and the cathode is connected to the neutral wire;
所述第一限流电阻连接于火线和发光二极管的阳极之间；The first current-limiting resistor is connected between the live wire and the anode of the light-emitting diode;
所述整流二极管与发光二极管并联连接，并且其阳极连接零线，阴极连接火线；The rectifier diode is connected in parallel with the light emitting diode, and its anode is connected to the neutral line, and its cathode is connected to the live line;
所述光敏三极管的集电极连接电源电压Vcc，用于在所述发光二极管开启时开启，并在所述发光二极管关闭时关闭；The collector of the phototransistor is connected to the power supply voltage Vcc, and is used to turn on when the light emitting diode is turned on, and to turn off when the light emitting diode is turned off;
所述光敏三极管的发射极和脉冲输出端相连；The emitter of the phototransistor is connected to the pulse output terminal;
所述光敏三极管的发射极还与接地端相连。The emitter of the phototransistor is also connected to the ground terminal.
作为优选，所述过零检测回路还包括：Preferably, the zero-crossing detection loop also includes:
第二限流电阻和滤波电容；The second current limiting resistor and filter capacitor;
所述第二限流电阻串联于所述光敏三极管的集电极和脉冲输出端之间；The second current limiting resistor is connected in series between the collector of the phototransistor and the pulse output terminal;
所述滤波电容串联于所述光敏三极管的发射极和脉冲输出端之间。The filter capacitor is connected in series between the emitter of the phototransistor and the pulse output terminal.
作为优选，所述过零检测回路还包括：Preferably, the zero-crossing detection loop also includes:
串联于所述光敏三极管的集电极和电源电压Vcc之间的上拉电阻。A pull-up resistor connected in series between the collector of the phototransistor and the power supply voltage Vcc.
作为优选，所述过零检测回路还包括：Preferably, the zero-crossing detection loop also includes:
串联于所述光敏三极管的发射极和接地端之间的下拉电阻。A pull-down resistor connected in series between the emitter of the phototransistor and the ground terminal.
一种空调，具有以上所述继电器闭合、断开控制装置。An air conditioner has the above-mentioned relay closing and opening control device.
本发明的有益效果为：本发明提供一种继电器闭合、断开控制装置及空调，由于继电器闭合、断开控制装置包括：过零检测回路和控制单元；过零检测回路包括火线输入端、零线输入端以及脉冲输出端，火线输入端连接火线，零线输入端连接零线，脉冲输出端和控制单元相连，用于向控制单元输出脉冲信号；控制单元还与继电器的信号输入端相连，根据所接收到的脉冲信号进行电源的过零信号检测，当检测到电源过零点，并且继电器又需要控制时，控制继电器断开或闭合。本方案通过检测电源过零信号，在电源过零点时对匹配感性负载的继电器进行控制，所以可大大降低继电器在闭合、断开时产生的尖峰电压。并且本方案还可以去除阻容吸收回路，利于电脑板的小型化和降低成本。The beneficial effects of the present invention are: the present invention provides a relay closing and disconnecting control device and an air conditioner, since the relay closing and disconnecting control device includes: a zero-crossing detection circuit and a control unit; the zero-crossing detection circuit includes a fire wire input terminal, a zero Line input terminal and pulse output terminal, the live wire input terminal is connected to the live wire, the neutral line input terminal is connected to the neutral line, the pulse output terminal is connected to the control unit, and is used to output pulse signals to the control unit; the control unit is also connected to the signal input terminal of the relay, The zero-crossing signal detection of the power supply is performed according to the received pulse signal. When the zero-crossing point of the power supply is detected and the relay needs to be controlled again, the control relay is opened or closed. This solution detects the zero-crossing signal of the power supply and controls the relay matching the inductive load when the power supply is zero-crossing, so the peak voltage generated when the relay is closed and disconnected can be greatly reduced. Moreover, this solution can also remove the resistance-capacitance absorption circuit, which is beneficial to the miniaturization and cost reduction of the computer board.
附图说明Description of drawings
图1是现有技术中带阻容吸收回路的继电器闭合、断开控制电路图；Fig. 1 is the closing and disconnecting control circuit diagram of a relay with a resistance-capacitance absorption circuit in the prior art;
图2是本发明具体实施方式提供的继电器闭合、断开控制装置的结构示意图；Fig. 2 is a schematic structural diagram of a relay closing and opening control device provided by a specific embodiment of the present invention;
图3是本发明具体实施方式提供的过零检测回路一种优选方式的电路图；Fig. 3 is a circuit diagram of a preferred mode of the zero-crossing detection circuit provided by the specific embodiment of the present invention;
图4是本发明具体实施方式提供的过零检测回路另一种优选方式的电路图；Fig. 4 is a circuit diagram of another preferred mode of the zero-crossing detection loop provided by the specific embodiment of the present invention;
图5是本发明具体实施方式提供的过零检测回路的工作时序图。Fig. 5 is a working timing diagram of the zero-crossing detection loop provided by the specific embodiment of the present invention.
其中：in:
1：过零检测回路；2：控制单元；3：继电器；4：感性负载；1: Zero-crossing detection circuit; 2: Control unit; 3: Relay; 4: Inductive load;
11：光电耦合器；12：脉冲输出端；11: Photocoupler; 12: Pulse output terminal;
111：发光二极管；112：光敏三极管。111: light emitting diode; 112: photosensitive triode.
具体实施方式Detailed ways
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
图2是本发明具体实施方式提供的继电器闭合、断开控制装置的结构示意图。如图2所示，该种继电器闭合、断开控制装置包括：过零检测回路1、控制单元2、电源和继电器3。所述电源与所述继电器3电连接，所述电源与所述继电器3之间并联有过零检测回路1；所述过零检测回路1检测所述电源的过零信号，并将所述过零信号传送给所述控制单元2；所述控制单元2与所述继电器3的信号输入端相连，根据所述过零信号控制继电器3断开或闭合。Fig. 2 is a schematic structural diagram of a relay closing and opening control device provided by a specific embodiment of the present invention. As shown in FIG. 2 , this kind of relay closing and opening control device includes: a zero-crossing detection circuit 1 , a control unit 2 , a power supply and a relay 3 . The power supply is electrically connected with the relay 3, and a zero-crossing detection circuit 1 is connected in parallel between the power supply and the relay 3; the zero-crossing detection circuit 1 detects the zero-crossing signal of the power supply, and The zero signal is transmitted to the control unit 2; the control unit 2 is connected to the signal input terminal of the relay 3, and the relay 3 is controlled to open or close according to the zero crossing signal.
具体的，所述过零检测回路1包括火线输入端、零线输入端以及脉冲输出端，所述火线输入端连接电源火线，所述零线输入端连接零线，所述脉冲输出端和控制单元2相连，用于向控制单元2输出脉冲信号。当所述控制单元2检测到电源的过零点信号，并且继电器3又需要断开或闭合时，控制单元2控制继电器3断开或闭合。Specifically, the zero-crossing detection circuit 1 includes a live wire input terminal, a neutral line input terminal and a pulse output terminal, the live wire input terminal is connected to the power supply live wire, the neutral line input terminal is connected to the neutral line, the pulse output terminal and the control The unit 2 is connected to output pulse signals to the control unit 2. When the control unit 2 detects the zero-crossing signal of the power supply and the relay 3 needs to be opened or closed, the control unit 2 controls the relay 3 to open or close.
所述继电器3用于控制感性负载4，所述继电器3的电流输入端连接火线，继电器3的电流输出端连接感性负载4的电流输入端，所述感性负载4的电流输出端连接零线。The relay 3 is used to control the inductive load 4, the current input end of the relay 3 is connected to the live wire, the current output end of the relay 3 is connected to the current input end of the inductive load 4, and the current output end of the inductive load 4 is connected to the neutral wire.
于本实施例中，所述感性负载4可以为电磁阀、交流接触器、交流风机等。In this embodiment, the inductive load 4 may be a solenoid valve, an AC contactor, an AC fan, and the like.
于本实施例中，所述控制单元2优选为MCU（MicroControllerUnit)，其中文名称为多点控制单元,又称单片微型计算机。In this embodiment, the control unit 2 is preferably an MCU (MicroControllerUnit), whose Chinese name is a multi-point control unit, also known as a single-chip microcomputer.
工作时，过零点检测电路1向控制单元2发送脉冲信号，控制单元2对所接收的脉冲信号进行检测，当控制单元2检测到过零点检测电路1产生的电平到达上升沿或者下降沿时，并且持续检测至少第一预设时间T1来确认该过零信号为有效信号。当控制单元2确认所述过零信号为有效信号后且在第二预设时间T2内需要所述继电器3断开或闭合时，控制单元2控制继电器3断开或闭合。如果第二预设时间T2后，继电器3又有需求进行控制，那需要等到下一个过零信号到来时，进行操作。继电器3通过断开或闭合来控制感性负载4。When working, the zero-crossing detection circuit 1 sends a pulse signal to the control unit 2, and the control unit 2 detects the received pulse signal. When the control unit 2 detects that the level generated by the zero-crossing detection circuit 1 reaches the rising or falling edge , and continuously detect at least a first preset time T1 to confirm that the zero-crossing signal is a valid signal. When the control unit 2 confirms that the zero-crossing signal is a valid signal and the relay 3 needs to be opened or closed within the second preset time T2, the control unit 2 controls the relay 3 to open or close. If the relay 3 needs to be controlled again after the second preset time T2, it needs to wait until the next zero-crossing signal arrives to perform the operation. The relay 3 controls the inductive load 4 by opening or closing.
于本实施例中，作为优选，所述第一预设时间T1为500us；所述第二预设时间T2为500us。当然，所述第一预设时间T1和第二预设时间T2也可以为其它值，其根据实际需要来确定。In this embodiment, preferably, the first preset time T1 is 500 us; the second preset time T2 is 500 us. Of course, the first preset time T1 and the second preset time T2 may also be other values, which are determined according to actual needs.
图3是本发明具体实施方式提供的过零检测回路一种优选方式的电路图。如图3所示，所述过零检测回路1包括：光电耦合器11、整流二极管D12、第一限流电阻R20。所述光电耦合器11由发光二极管111和光敏三极管112组成。Fig. 3 is a circuit diagram of a preferred mode of the zero-crossing detection circuit provided by the specific embodiment of the present invention. As shown in FIG. 3 , the zero-crossing detection circuit 1 includes: a photocoupler 11 , a rectifier diode D12 , and a first current limiting resistor R20 . The photocoupler 11 is composed of a light emitting diode 111 and a phototransistor 112 .
其中，所述发光二极管111的阳极连接火线，阴极连接零线。Wherein, the anode of the LED 111 is connected to the live wire, and the cathode is connected to the neutral wire.
所述第一限流电阻R20连接于火线和发光二极管111的阳极之间。第一限流电阻R20的阻值一般较大，用于限制电流的大小，以保护光电耦合器11的正常工作。The first current limiting resistor R20 is connected between the live wire and the anode of the LED 111 . The resistance value of the first current limiting resistor R20 is generally larger, and is used to limit the magnitude of the current to protect the normal operation of the photocoupler 11 .
所述整流二极管D12与发光二极管111并联连接，并且其阳极连接零线，阴极连接火线。整流二极管D12具有以下作用：在正弦交流电为负半周（火线电压UL＜UN）时防止光电耦合器11中的发光二极管111被反向击穿。The rectifier diode D12 is connected in parallel with the light emitting diode 111 , and its anode is connected to the neutral line, and its cathode is connected to the live line. The rectifier diode D12 has the following functions: to prevent the light-emitting diode 111 in the photocoupler 11 from being reversely broken down when the sinusoidal alternating current is in the negative half cycle (line voltage UL < U N ).
所述光敏三极管112的集电极连接电源电压Vcc，用于在所述发光二极管开启时开启，并在所述发光二极管关闭时关闭。The collector of the phototransistor 112 is connected to the power supply voltage Vcc, and is used for turning on when the light emitting diode is on, and turning off when the light emitting diode is off.
所述光敏三极管112的发射极和脉冲输出端12相连，所述光敏三极管112的发射极还与接地端相连。脉冲输出端12用于在所述光敏三极管112开启时输出信号，并在所述光敏三极管112关闭时停止输出信号。脉冲输出端12输出的脉冲信号将会流向控制单元2。The emitter of the phototransistor 112 is connected to the pulse output terminal 12, and the emitter of the phototransistor 112 is also connected to the ground terminal. The pulse output terminal 12 is used to output a signal when the phototransistor 112 is turned on, and stop outputting a signal when the phototransistor 112 is turned off. The pulse signal output from the pulse output terminal 12 will flow to the control unit 2 .
于本实施例中，作为优选方案，所述过零检测回路1还包括上拉电阻R21或，所述上拉电阻R21串联于所述光敏三极管112的集电极和电源电压Vcc之间，所述下拉电阻串联于所述光敏三极管112的发射极和接地端之间。In this embodiment, as a preferred solution, the zero-crossing detection circuit 1 further includes a pull-up resistor R21 or, the pull-up resistor R21 is connected in series between the collector of the phototransistor 112 and the power supply voltage Vcc, the The pull-down resistor is connected in series between the emitter of the phototransistor 112 and the ground.
具体的，所述上拉电阻R21和下拉电阻的作用是在光敏三极管导通时，限制流过光敏三极管的电流大小，防止因电流过大导致光敏三极管损坏。Specifically, the function of the pull-up resistor R21 and the pull-down resistor is to limit the current flowing through the phototransistor when the phototransistor is turned on, so as to prevent the phototransistor from being damaged due to excessive current.
图4是本发明具体实施方式提供的过零检测回路另一种优选方式的电路图。如图4所示，该实施例所提供的过零检测回路与图3中所提供的过零检测回路不同之处在于：所述过零检测回路1还包括：第二限流电阻R22和滤波电容C13。Fig. 4 is a circuit diagram of another preferred mode of the zero-crossing detection loop provided by the specific embodiment of the present invention. As shown in Figure 4, the difference between the zero-crossing detection loop provided in this embodiment and the zero-crossing detection loop provided in Figure 3 is that the zero-crossing detection loop 1 also includes: a second current limiting resistor R22 and a filter Capacitor C13.
所述第二限流电阻R22串联于所述光敏三极管112的集电极和脉冲输出端12之间。第二限流电阻R22起到限流的作用。The second current limiting resistor R22 is connected in series between the collector of the phototransistor 112 and the pulse output terminal 12 . The second current limiting resistor R22 plays a role of current limiting.
所述滤波电容C13串联于所述光敏三极管112的发射极和脉冲输出端12之间。滤波电容C13起到滤波的作用。The filter capacitor C13 is connected in series between the emitter of the phototransistor 112 and the pulse output terminal 12 . The filter capacitor C13 functions as a filter.
图5是本发明具体实施方式提供的过零检测回路的工作时序图。如图5所示，在正弦交流电的负半周（火线电压UL＜UN），发光二极管111关闭，此时光敏三极管112不导通，脉冲输出端12不输出脉冲信号。在正弦交流电的正半周（火线电压UL＞UN），发光二极管111导通发光，此时光敏三极管112被激发导通，脉冲输出端12输出脉冲信号并将脉冲信号发送到控制单元2，控制单元2最终得到的信号为方波信号，能准确的反应正弦交流电的过零点。Fig. 5 is a working timing diagram of the zero-crossing detection loop provided by the specific embodiment of the present invention. As shown in FIG. 5 , in the negative half cycle of the sinusoidal alternating current (line voltage UL < U N ), the light-emitting diode 111 is turned off, and the phototransistor 112 is not conducting at this time, and the pulse output terminal 12 does not output a pulse signal. In the positive half cycle of the sinusoidal alternating current (line voltage UL > U N ), the light-emitting diode 111 turns on and emits light. At this time, the phototransistor 112 is excited and turned on, and the pulse output terminal 12 outputs a pulse signal and sends the pulse signal to the control unit 2. The final signal obtained by the control unit 2 is a square wave signal, which can accurately reflect the zero-crossing point of the sinusoidal alternating current.
当控制单元2上电后，可以收到过零检测回路从220V/AC电源取得并传送的过零信号，控制单元2收到过零信号后，在检测到过零点检测电路产生上升沿或者下降沿电平变化时，然后再持续检测第一预设时间T1（500us），确认电平状态正确后，继电器控制使能有效，继电器需要控制断开、闭合时，组要在第二预设时间T2（500us）内完成。如果经过第二预设时间T2后，继电器又有需求进行控制，那需要等到下一个过零信号到来时进行继电器闭合、断开控制。When the control unit 2 is powered on, it can receive the zero-crossing signal obtained and transmitted by the zero-crossing detection circuit from the 220V/AC power supply. After the control unit 2 receives the zero-crossing signal, it will generate a rising edge or a falling When the level changes, then continue to detect the first preset time T1 (500us). After confirming that the level state is correct, the relay control is enabled. Completed within T2 (500us). If the relay needs to be controlled again after the second preset time T2 has elapsed, it is necessary to wait until the next zero-crossing signal arrives to perform the relay closing and opening control.
当所述光敏三极管112的集电极和电源电压Vcc之间串联有上拉电阻R21，光敏三极管112导通时，脉冲输出端12输出的脉冲信号为低电平信号；当所述光敏三极管112的发射极和接地端之间串联有下拉电阻，光敏三极管112导通时，脉冲输出端12输出的脉冲信号为高电平信号。When there is a pull-up resistor R21 in series between the collector of the phototransistor 112 and the power supply voltage Vcc, when the phototransistor 112 is turned on, the pulse signal output by the pulse output terminal 12 is a low-level signal; when the phototransistor 112 A pull-down resistor is connected in series between the emitter and the ground terminal. When the phototransistor 112 is turned on, the pulse signal output from the pulse output terminal 12 is a high-level signal.
本发明的关键点是利用交流电源固有的过零点特性，此时理论电压值为0，在过零点进行继电器的吸合、断开控制，产生的尖峰电压最小，而且可以去除阻容吸收回路，利于电脑板的小型化。The key point of the present invention is to use the inherent zero-crossing characteristics of the AC power supply. At this time, the theoretical voltage value is 0, and the pull-in and disconnection control of the relay is performed at the zero-crossing point. The peak voltage generated is the smallest, and the resistance-capacitance absorption circuit can be removed. Conducive to the miniaturization of the computer board.
本发明还提供了一种空调，其中，所述空调具有以上所述的继电器闭合、断开控制装置。The present invention also provides an air conditioner, wherein the air conditioner has the above-mentioned relay closing and opening control device.
以上结合具体实施例描述了本发明的技术原理。这些描述只是为了解释本发明的原理，而不能以任何方式解释为对本发明保护范围的限制。基于此处的解释，本领域的技术人员不需要付出创造性的劳动即可联想到本发明的其它具体实施方式，这些方式都将落入本发明的保护范围之内。The above describes the technical principles of the present invention in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention, and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation modes of the present invention without creative efforts, and these modes will all fall within the protection scope of the present invention.
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