CN218379839U - Fresh air exchanger control circuit and fresh air exchanger - Google Patents

Abstract

The utility model discloses a new trend switch control circuit and new trend switch, utilize first port to be connected with three phase motor or single phase motor, utilize the second port to connect three phase motor or single phase motor's power supply, and simultaneously, convert the power supply that the second port is connected into the power that can supply controller and motor speed control circuit through utilizing first voltage conversion circuit, and utilize motor speed control circuit to realize the speed control of the motor that the second port is connected, this application can be applicable to the new trend switch who carries the motor of the different grade type, realize the rotational speed control of the new trend switch of different grade type, have the strong characteristics of commonality and flexibility.

Description

Fresh air exchanger control circuit and fresh air exchanger

Technical Field

The utility model belongs to the technical field of the new trend switch and specifically relates to a new trend switch control circuit and new trend switch are related to.

Background

The fresh air exchanger is used for discharging indoor dirty air outdoors, and inputting outdoor fresh air into the room after measures such as sterilization, disinfection, filtration and the like, so that the room is always fresh and clean air.

The existing controller of the fresh air fan can only be used one by one in a targeted mode, and is difficult to apply to various different types of motors.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming and not enough, provide a new trend switch control circuit and new trend switch that can use on the motor of multiple different grade type.

The utility model provides a fresh air exchanger control circuit, which comprises a first port, a second port, a controller, a motor rotating speed control circuit and a first voltage conversion circuit;

the first port comprises a first connection pin, a second connection pin, a third connection pin, a fourth connection pin and a fifth connection pin;

the second port comprises a fifth connection pin, a sixth connection pin, a seventh connection pin and an eighth connection pin;

when the first connecting pin, the second connecting pin and the third connecting pin are respectively connected with three input ends of a three-phase motor, the fifth connecting pin, the sixth connecting pin and the seventh connecting pin are respectively connected with three live wire ends of a three-phase power supply, and the eighth connecting pin is connected with a zero wire end of the three-phase power supply;

when the third connecting pin and the fourth connecting pin are respectively connected with two input ends of a single-phase motor, the seventh connecting pin is connected with a live wire end of a single-phase power supply, and the eighth connecting pin is connected with a zero wire end of the single-phase power supply;

a first input end of the first voltage conversion circuit is connected with the seventh connecting pin, and a second input end of the first voltage conversion circuit is connected with the eighth connecting pin;

the controller is respectively connected with the first voltage conversion circuit and the motor rotating speed control circuit; and the motor rotating speed control circuit is connected with the fifth connecting pin.

The utility model provides a fresh air exchanger, which comprises a three-phase motor, a three-phase power supply and a fresh air exchanger control circuit as described in any one of the above;

three input ends of the three-phase motor are respectively connected with a first connecting pin, a second connecting pin and a third connecting pin of the first port;

and three live wire ends of the three-phase power supply are respectively connected with a fifth connecting pin, a sixth connecting pin and a seventh connecting pin of the second port, and a zero wire end of the three-phase power supply is connected with an eighth connecting pin of the second port.

The utility model provides a fresh air exchanger, which comprises a single-phase motor, a single-phase power supply and a fresh air exchanger control circuit as mentioned in any one of the above;

two input ends of the single-phase motor are respectively connected with a third connecting pin and a fourth connecting pin of the first port, a fire wire end of the single-phase power supply is connected with a seventh connecting pin of the second port, and a zero wire end of the single-phase power supply is connected with an eighth connecting pin of the second port.

The utility model discloses in, utilize first port to be connected with three phase motor or single phase motor, utilize the second port to connect three phase motor or single phase motor's power supply, and simultaneously, convert the power supply who connects the second port into the power that can supply controller and motor speed control circuit through utilizing first voltage conversion circuit, and utilize motor speed control circuit to realize the speed control of the motor that the second port is connected, this application can be applicable to and carry on the new trend switch of the motor of different grade type, realize the rotational speed control of the new trend switch of different grade type, have the strong characteristics of commonality and flexibility.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of a control circuit of a fresh air exchanger according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a motor speed control circuit according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a first voltage conversion circuit according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a voltage conversion circuit according to another embodiment of the present invention;

fig. 5 is a circuit diagram of a radio frequency receiving circuit according to an embodiment of the present invention;

fig. 6 is a circuit diagram of an interface circuit according to an embodiment of the present invention;

fig. 7 is a circuit diagram of a dry contact circuit in accordance with an embodiment of the present invention;

fig. 8 is a circuit diagram of a fire alarm circuit according to an embodiment of the present invention;

fig. 9 is a circuit diagram of a fresh air valve control circuit according to an embodiment of the present invention;

fig. 10 is a circuit diagram of a 485 communication circuit according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Referring to fig. 1, the present invention provides a control circuit of a fresh air exchanger, which can be applied to a fresh air exchanger, and includes a first port 100, a second port 200, a controller 300, a motor speed control circuit 400 and a first voltage conversion circuit 500;

the first port 100 comprises a first connection pin 101, a second connection pin 102, a third connection pin 103 and a fourth connection pin 104;

the second port 200 comprises a fifth connection pin 201, a sixth connection pin 202, a seventh connection pin 203 and an eighth connection pin 204;

the first port 100 may be connected with a single-phase motor or a three-phase motor; the second port 200 may be connected to a single phase power supply or a three phase power supply, and the power supply connected to the second port 200 may be used to power the motor connected to the first port.

In the embodiment of the application, when the first port 100 is connected with a single-phase motor, the second port 200 is connected with a single-phase power supply; when the first port 100 is connected to a three-phase motor, the second port 200 is connected to a three-phase power source.

Specifically, when the first connection pin 101, the second connection pin 102 and the third connection pin 103 are respectively connected to three input ends of a three-phase motor, the fifth connection pin 201, the sixth connection pin 202 and the seventh connection pin 203 are respectively connected to three live wire ends L1, L2 and L3 of a three-phase power supply, and the eighth connection pin 204 is connected to a neutral wire end N of the three-phase power supply;

when the third connecting pin 103 and the fourth connecting pin 104 are respectively connected with two input ends of a single-phase motor, the seventh connecting pin 203 is connected with a live wire end L of a single-phase power supply, and the eighth connecting pin 204 is connected with a neutral wire end N of the single-phase power supply;

a first input end of the first voltage conversion circuit 500 is connected to the seventh connection pin 203, and a second input end of the first voltage conversion circuit 500 is connected to the eighth connection pin 204;

the controller 300 is connected to the first voltage conversion circuit 500 and the motor speed control circuit 400 respectively; the motor rotation speed control circuit 400 is connected to the fifth connection pin 105;

the controller 300 outputs a rotation speed control signal to the motor rotation speed control circuit 400, and the motor rotation speed control circuit 400 controls the rotation speed of the single-phase motor or the three-phase motor connected to the first port 100.

As shown in fig. 2, which is a circuit diagram of a motor speed control circuit 400 in one embodiment; the motor rotating speed control circuit comprises first resistors R8-R13, an optocoupler U13, capacitors C14-C15, an electrolytic capacitor EC7, a motor interface CN15 and a triode Q5;

the anode of the light emitting diode of the optocoupler U13 is respectively connected with a power supply and the first end of a capacitor C14, the second end of the capacitor C14 is grounded, and the cathode of the light emitting diode of the optocoupler U13 is connected with a controller through a resistor R10;

the base electrode of a phototriode of the optocoupler U13 is connected with the anode of a diode of the optocoupler U13, the cathode of the diode of the optocoupler U13 is respectively connected with the second end of a capacitor C15, the first end of a resistor R11 and the first end of a resistor R12, the first end of the capacitor C15 is grounded, the second end of the resistor R11 is respectively connected with the collector electrode of the phototriode of the optocoupler U13, the first end of a capacitor C16 and the first end of the resistor R13, the second end of the capacitor C16 and the emitter electrode of the phototriode are grounded, the second end of the resistor R13 is connected with the base electrode of a triode Q5, the collector electrode of the triode Q5 is respectively connected with the 3 end of a motor interface CN15 and the second end of the resistor R12, and the emitter electrode of the triode Q5 is grounded; the motor interface CN15 can be used for connecting a fresh air motor or an exhaust air motor of a fresh air exchanger, 2 ends of the motor interface CN15 are respectively connected with a 10V power supply and the anode of the electrolytic capacitor EC7, and 1 end of the motor interface CN15 is respectively connected with the cathode of the electrolytic capacitor EC7 and the ground.

Because whether the reference ground of the speed regulating signal of the motor is isolated cannot be confirmed, and some incompatible, mutual interference and even potential safety hazards can occur if the speed regulating signal of the motor is directly connected with the ground of the controller, the reference ground of the controller and the control signal of the motor are electrically isolated by adopting the optocoupler in the embodiment of the application, so that the problems of incompatibility of common ground signals and abnormal interference and safety risks are solved, and the controller can control various types of motors with different powers and different sizes of a plurality of different manufacturers without risks.

In the embodiment of the application, the optocoupler and the triode are utilized to form a PWM speed regulation control circuit of the motor, the larger the PWM speed regulation duty ratio is, the faster the motor rotating speed is, the smaller the speed regulation duty ratio is, the slower the motor rotating speed is, and when the PWM1 output duty ratio is 0, the motor stops running.

Preferably, as shown in fig. 2, the fresh air exchanger control circuit further includes a motor speed feedback circuit 800; the motor rotating speed feedback circuit 800 comprises capacitors C12-C13, resistors R7-R9 and an optocoupler U15;

the anode of a light emitting diode of the optocoupler U15 is respectively connected with the first end of a capacitor C13 and the first end of a resistor R8, the second end of the capacitor C13 is grounded, the second end of the resistor R8 is connected with a power supply, the cathode of the light emitting diode of the optocoupler U15 is connected with the first end of a resistor R9, the second end of the resistor R9 is connected with the 4 end of a motor interface CN15, and the 4 end of the motor interface CN15 is connected with the feedback signal output end of a motor; the collecting electrode of the phototriode of the optocoupler U15 is connected with the first end of the capacitor C12 and the 3.3V power supply respectively, the second end of the capacitor C12 is grounded, the emitting electrode of the phototriode of the optocoupler U15 is connected with the first end of the controller and the resistor R7 respectively, and the second end of the resistor R7 is grounded.

In the embodiment of the application, the controller learns the rotating speed of the motor according to the feedback signal FG1 of the motor and realizes speed regulation closed-loop control on the motor through logical operation, so that the speed control precision of the motor is higher, and the control air volume is more stable.

The new trend switch in this application can include single motor or two motors of new trend motor and the motor of airing exhaust, include new trend motor and the motor of airing exhaust when the new trend switch, new trend switch control circuit still includes the third port that is used for being connected with another motor, a motor speed control circuit and the motor speed feedback circuit that corresponds for controlling another motor, the structure and the connected mode of third port can refer to the structure and the connected mode of second port, and similarly, motor speed control circuit that another motor corresponds and the circuit diagram that can refer to the foretell motor speed control circuit 400 of this application, motor speed feedback circuit can refer to the foretell motor speed feedback circuit 800 of this application, no longer describe herein.

The first voltage conversion circuit 500 is used for converting the first port into a first voltage by connecting the first port to a single-phase power supply or a three-phase power supply, wherein the first voltage can be used by circuit modules of the fresh air switch, a controller, a motor speed control circuit and the like.

As shown in fig. 3, which is a circuit diagram of a first voltage converting circuit 500 in one embodiment; the first voltage conversion circuit 500 is used for converting a 220V ac power source into a 12V dc power source.

Specifically, the first voltage conversion circuit 500 includes: the device comprises a fuse F1, a piezoresistor ZNR1, a safety capacitor X1, a common-mode inductor L1, a thermistor NTC1, a first voltage conversion module U17 and an electrolytic capacitor EC1;

the first end of the fuse F1 is connected with the seventh connection pin 203, the second end of the fuse F1 is respectively connected with the second end of the piezoresistor ZNR1, the second end of the safety-regulation capacitor X1 and the second end of the common-mode inductor L1, the first end of the piezoresistor ZNR1 is connected with the eighth connection pin 204, the first end of the safety-regulation capacitor X1 and the first end of the common-mode inductor L1, the third end of the common-mode inductor L1 is connected with the 1 end of the voltage conversion module U17, the fourth end of the common-mode inductor L1 is connected with the first end of the thermistor NTC1, the second end of the thermistor NTC1 is connected with the 2 end of the voltage conversion module U17, the 3 end of the voltage conversion module U17 is connected with the positive electrode of the electrolytic capacitor EC1, the 4 end of the voltage conversion module U17 is connected with the negative electrode of the electrolytic capacitor EC1, and the output ends 5-6 of the voltage conversion module U17 output a first voltage to the fresh air exchanger.

In the embodiment of the present application, the first voltage conversion module U17 is configured to convert a 220V ac power source into a 12V dc power source.

The first voltage conversion circuit 500 according to the embodiment of the present application utilizes a fuse to perform short-circuit protection on a circuit, utilizes a voltage dependent resistor and a thermistor to form a surge lightning protection circuit, and utilizes a conducted interference protection circuit formed by a safety capacitor and a common mode inductor to improve the operation safety and reliability of the first voltage conversion circuit.

Preferably, the first voltage conversion circuit 500 of the present application further includes a replacement port CN19, and the replacement port CN19 is connected to the output terminal of the first voltage conversion circuit 500;

the alternative port CN19 is used for connecting an alternative power supply, the voltage of which is equal to the output voltage of the first voltage conversion circuit 500, for example, when the output voltage of the first voltage conversion circuit 500 is 12V, the alternative power supply is a 12V dc power supply.

When the first voltage conversion circuit 500 is abnormal (for example, damaged), only the module corresponding to the first voltage conversion circuit 500 needs to be taken out for maintenance, and the replacement port can be connected to a replacement power supply, so that the control circuit of the fresh air exchange device can keep working normally.

As shown in fig. 4, in a preferred embodiment, the first voltage conversion circuit 500 further includes electrolytic capacitors EC2-EC4, an inductor L2, and an electrostatic discharge tube RLSD3;

the output end of the first voltage conversion module U17 is respectively connected with the positive electrode of the electrolytic capacitor EC2 and the first end of the inductor L2, the first end of the inductor L2 is respectively connected with the positive electrode of the electrolytic capacitor EC3, the cathode of the electrostatic discharge tube RLSD3 and the positive electrode of the electrolytic capacitor EC4, the positive electrode of the electrolytic capacitor EC4 outputs 12V voltage to the fresh air exchanger, and the cathode of the electrolytic capacitor EC2-4 and the anode of the electrostatic discharge tube RLSD3 are grounded.

In the embodiment of the application, the electrolytic capacitor, the inductor and the electrostatic discharge tube are used for performing voltage stabilization and filtering on the first voltage conversion module U17, so that the output voltage ripple and the noise of the first voltage conversion circuit are reduced, and the reliability of the voltage output by the first voltage conversion circuit is improved.

The utility model discloses in, utilize first port to be connected with three phase motor or single phase motor, utilize the second port to connect three phase motor or single phase motor's power supply, and simultaneously, convert the power supply who connects the second port into the power that can supply controller and motor speed control circuit through utilizing first voltage conversion circuit, and utilize motor speed control circuit to realize the speed control of the motor that the second port is connected, this application can be applicable to and carry on the new trend switch of the motor of different grade type, realize the rotational speed control of the new trend switch of different grade type, have the strong characteristics of commonality and flexibility.

As shown in fig. 4, the fresh air exchange control circuit further includes a second voltage conversion circuit 600 and a third voltage conversion circuit 700;

the second voltage converting circuit 600 is configured to convert the first voltage into a second voltage; wherein the second voltage is less than the first voltage;

in the embodiment of the present application, the second voltage conversion circuit 600 is configured to convert a 12V dc power into a 5V dc power, and specifically, the second voltage conversion circuit 600 includes a capacitor C1, an inductor L3, a diode D1, and a second voltage conversion module U2;

the second voltage conversion module U2 is used to convert the 12V dc power to 5V dc power.

The end 1 of the second voltage conversion module U2 is respectively connected with the first end of the capacitor C1 and the positive electrode of the electrolytic capacitor EC4, and the second end of the capacitor C1 is grounded; and the 2 end of the second voltage conversion module U2 is respectively connected with the first end of the inductor L3 and the cathode of the diode D1, and the second end of the inductor L3 and the anode of the diode D1 are grounded. The 4 ends of the second voltage conversion module U2 output 5V voltage to the fresh air exchanger, and the 3 ends and the 5 ends of the second voltage conversion module U2 are grounded.

The third voltage converting circuit 700 is configured to convert the second voltage into a third voltage; wherein the third voltage is less than the second voltage;

in the embodiment of the present application, the third voltage conversion circuit 700 is used for converting 5V dc power into 3.3V dc power, and specifically, the third voltage conversion circuit 700 includes electrolytic capacitors EC5 to EC6, capacitors C2 to C3, and a third voltage conversion module U3.

The third voltage conversion module U3 is used to convert the 5V dc power to 3.3V dc power.

The anode of the electrolytic capacitor EC5 is respectively connected with the first end of the capacitor C2, the end 4 of the second voltage conversion module U2 and the end 3 of the third voltage conversion module U3, and the cathode of the electrolytic capacitor EC5, the second end of the capacitor C2 and the end 1 of the third voltage conversion module U3 are grounded; the 2 end of the third voltage conversion module U3 is connected to the positive electrode of the electrolytic capacitor EC6 and the first end of the capacitor C3, and the negative electrode of the electrolytic capacitor EC6 and the second end of the capacitor C3 are grounded. And the 2 end of the third voltage conversion module U3 outputs 3.3V voltage to the fresh air exchanger.

As shown in fig. 5, in an embodiment, the fresh air exchange control circuit further includes a radio frequency receiving circuit connected to the controller, and the radio frequency receiving circuit is configured to receive a wireless communication signal.

The radio frequency receiving circuit comprises resistors R61-R62, capacitors C38-C46, inductors L4-L6, a crystal oscillator X2, a digital modulation and demodulation chip U11 and an antenna L41.

The 1-6 ends of the digital modulation and demodulation chip U11 are respectively connected with the controller, the 18 ends of the digital modulation and demodulation chip U11 are respectively connected with the 3.3V power supply, the second end of the capacitor C38, the second end of the capacitor C39, the 15 end of the digital modulation and demodulation chip U11 and the 7 end of the digital modulation and demodulation chip U11, and the first end of the capacitor C38 and the first end of the capacitor C39 are grounded; the 20 end of the digital modulation and demodulation chip U11 is respectively connected with the 17 end of the digital modulation and demodulation chip U11, the 14 end of the digital modulation and demodulation chip U11 and the 8 end of the digital modulation and demodulation chip U11, the 19 end of the digital modulation and demodulation chip U11 is grounded through a capacitor C40, and the 16 end of the digital modulation and demodulation chip U11 is grounded through a resistor R61;

the 9 end of the digital modulation and demodulation chip U11 is grounded, the 10 end of the digital modulation and demodulation chip U11 is respectively connected with the second end of the crystal oscillator X2 and the first end of the capacitor C45, the first end of the crystal oscillator X2 is grounded through the capacitor C6, and the second end of the capacitor C45 is grounded.

The end 13 of the digital modulation and demodulation chip U11 is connected to the first end of the inductor L5 and the first end of the inductor L4, the second end of the inductor L4 is connected to the first end of the capacitor C41, the second end of the capacitor C41 is connected to the first end of the capacitor C43 and the second end of the resistor R62, and the first end of the resistor R62 is connected to the antenna L41; the second end of the inductor L5 is connected to the 12 end of the digital modem chip U11 and the first end of the inductor L6, the second end of the inductor L6 is connected to the 11 end of the digital modem chip U11, the first end of the capacitor C44, and the first end of the capacitor C42, the second end of the capacitor C42 is connected to the second end of the capacitor C43 and ground, and the second end of the capacitor C44 is grounded.

The radio frequency receiving circuit receives a wireless communication signal by using an antenna, the wireless communication signal is preprocessed through a frequency-selecting filter network consisting of an inductor and a capacitor and then input to a digital modulation and demodulation chip to be demodulated and operated, the digital modulation and demodulation chip outputs the demodulated signal to the controller, the controller inquires whether the signal is an effective receiving command, if so, a related circuit is controlled to execute corresponding action according to the signal, otherwise, the controller discards the signal, and the radio frequency receiving circuit can realize the wireless control of a fresh air exchanger.

In one embodiment, the fresh air switch control circuit further comprises a temperature sensor, a humidity sensor, a PM2.5 dust sensor and a TVOC sensor, and the temperature sensor, the humidity sensor, the PM2.5 dust sensor and the TVOC sensor are respectively connected with the controller.

The temperature sensor is used for detecting the ambient temperature.

The humidity sensor is used for detecting indoor humidity.

The PM2.5 dust sensor is used for detecting the concentration of PM2.5 dust.

The TVOC sensor is used for detecting the concentration of indoor TVOC gas;

the temperature sensor comprises an indoor temperature sensor and an outdoor temperature sensor which are respectively used for detecting the indoor environment temperature and the outdoor environment temperature, and when the indoor temperature or the outdoor temperature is detected to reach a set value, the corresponding temperature sensor sends a detection signal to the controller.

PM2.5 dust sensor includes indoor PM2.5 dust sensor and outdoor PM2.5 dust sensor, is used for detecting indoor PM2.5 dust concentration and outdoor PM2.5 dust concentration respectively, and when detecting indoor PM2.5 dust concentration or outdoor PM2.5 dust concentration and reach the setting value, corresponding PM2.5 dust sensor sends the detected signal to the controller

The controller is according to the temperature detect sensor, humidity transducer PM2.5 dust sensor and TVOC sensor's detected signal control motor speed control circuit to the rotational speed of the corresponding motor of control adjustment.

Specifically, when the indoor humidity is high (e.g., humidity value greater than 90% rh), the exhaust fan is controlled to operate at a high speed, the air flow speed of the room is increased, and the humidity is exhausted into the room as quickly as possible.

When the controller judges that the concentration of the indoor PM2.5 reaches the medium level or above according to the detection signal of the PM2.5 dust sensor, the fresh air motor is controlled to run at a low speed so as to prevent the fresh air motor from sucking too much dust to shorten the service life of a filter screen of the fresh air motor. The high-speed operation of the exhaust fan is controlled, so that the fresh air exchanger can quickly exhaust and operate, and the aims of quickly removing indoor dirty air and reducing indoor dust concentration are fulfilled.

As shown in FIG. 6, in an embodiment, the control circuit of the fresh air switch further includes an interface circuit, and the interface circuit includes a connection port CN7, an electrolytic capacitor EC12, a capacitor C34, resistors R51-R52, and bidirectional voltage regulators TVS3-TVS4.

The connecting port CN7 can be connected with a PM2.5 dust sensor, a carbon dioxide sensor, a temperature detection sensor, a humidity sensor or a TVOC sensor;

the 4 end of the connecting port CN7 is respectively connected with the ground, the 3 end of the connecting port CN7, the negative electrode of the electrolytic capacitor EC12 and the first end of the capacitor C34; the 3 end of the connecting port CN7 is connected with the positive electrode of the electrolytic capacitor EC12, the 5V power supply and the second end of the capacitor C34; the 2 end of the connection port CN7 is respectively connected with the first end of the resistor R51 and the first end of the bidirectional voltage regulator TVS 3; the second end of the resistor R51 is connected with the controller, and the second end of the bidirectional voltage regulator TVS3 is grounded; the 1 end of the connection port CN7 is connected to the first end of the resistor R52 and the first end of the bidirectional regulator TVS4, the second end of the resistor R52 is connected to the controller, and the second end of the bidirectional regulator TVS4 is grounded.

PM2.5 dust sensor, carbon dioxide sensor, temperature detection sensor, humidity transducer and TVOC sensor can be connected with the controller through interface circuit in this application embodiment, and this interface circuit utilizes components such as two-way stabilivolt, electric capacity and resistance to constitute electrostatic protection circuit, and hand static electricity or other interference voltage bunch enter the port and damage the controller when can effectively preventing to insert the plug-in sensor improves fresh air exchange machine control circuit's reliability.

In one embodiment, as shown in fig. 7, the dry junction circuit further comprises a dry junction circuit, wherein the dry junction circuit comprises a connection port CN4, a relay KY1, a diode D2, resistors R39-R40 and a triode Q1;

the first end of a coil of the relay KY1 is connected with a 12V power supply and the cathode of the diode D2, the second end of the coil of the relay KY1 is connected with the anode of the diode D2 and the collector of the triode Q1, a normally closed contact NC of the relay KY1 is connected with the end 1 of the connection port CN4, a common contact COM of the relay KY1 is connected with the end 3 of the connection port CN4, and a normally open contact NO of the relay KY1 is connected with the end 5 of the connection port CN 4; the base electrode of the triode Q1 is respectively connected with the first end of the resistor R39 and the first end of the resistor R40, the second end of the resistor R39 is connected with the controller, the second end of the resistor R40 is grounded, and the emitting electrode of the triode Q1 is grounded.

Connection port CN4 can be used to connect the external equipment, realizes the coordinated control of new trend switch and external equipment to can realize different functions. Wherein, the external equipment can be an air valve, an electric heater, an indicator light, a fireproof valve, a fireproof door and the like;

specifically, when the external equipment is an air valve and the new fan exchanger is started, the external air valve can be linked to open, so that the air valve is opened, and the air conditioning speed is increased; when the external equipment is an electric heater, the fresh air exchanger can be linked with the electric heater when heating compensation is needed in winter, and when the fresh air exchanger is started to operate, the electric heater is synchronously started to heat, so that fresh heated warm air is obtained indoors. When the external equipment is the status indicator lamp, the new trend machine switch has the function of instructing the running state of current new trend machine, for example, when the new trend switch operation, the status indicator lamp lights, and when the new trend switch stopped, the status indicator lamp extinguishes.

Through connection port realizes the coordinated control to external equipment, can connect different external equipment and carry out coordinated control in different scenes, makes the new trend switch more intelligent.

As shown in FIG. 8, in one embodiment, the fire alarm device further comprises a fire alarm circuit, wherein the fire alarm circuit comprises a connection port CN6, a rectifier bridge D5, an optical coupler U12, resistors R45-R46 and a capacitor C29.

The end 1 of the connection port CN6 is connected with the first end of the rectifier bridge D5, the end 2 of the connection port CN6 is connected with the second end of the rectifier bridge D5, the third end of the rectifier bridge D5 is connected with the anode of the light emitting diode of the optocoupler U12 through a resistor R45, the fourth end of the rectifier bridge D5 is connected with the cathode of the light emitting diode of the optocoupler U12, the collector of the phototriode of the optocoupler U12 is respectively connected with the second end of a resistor R46, the first end of a capacitor C29 and a controller, the first end of the resistor R46 is connected with a 3.3V power supply, and the emitter of the phototriode of the optocoupler U12 and the second end of the capacitor C29 are grounded;

the connection port CN6 can be connected with a fire alarm, and the rectifier bridge converts an alternating current voltage signal or a direct current voltage signal of the fire alarm into a direct current voltage signal with a fixed end and a positive output to drive the optocoupler U12 to be conducted, so that a fire alarm signal is output to the controller.

The fire alarm circuit of the embodiment of the application does not need to distinguish that the alarm signal input by the fire alarm is an alternating current signal or a direct current signal, and does not need to limit the positive and negative of the connection port CN6, so that the fire alarm can be seamlessly butted, and the installation efficiency is improved.

Preferably, when the dry contact circuit is connected with a fire door or a fire valve, when the controller receives a fire alarm signal of the fire alarm circuit, the controller can control the fresh air exchanger to stop working through the motor speed control circuit, and simultaneously, the controller controls the fire door or the fire valve to be closed through the dry contact circuit, so that the spreading of fire or dense smoke is prevented, and the safety is improved.

In one embodiment, the control circuit of the fresh air exchanger further comprises a fresh air valve control circuit and an exhaust air valve control circuit, the fresh air valve control circuit is used for controlling a fresh air valve arranged at a fresh air inlet of the fresh air exchanger, and the exhaust air valve control circuit is used for controlling an exhaust air valve arranged at an exhaust air outlet of the fresh air exchanger.

As shown in fig. 9, which is a circuit diagram of a fresh air valve control circuit in an embodiment, the fresh air valve control circuit includes an IO port expansion chip U7, a stepping motor driving chip U9, stepping motor ports CN15 to CN16, capacitors C24 to C25, and a parallel resistor RP1; the parallel resistor RP1 is formed by connecting 4 resistors in parallel.

The stepper motor driver chip U9 may be a darlington tube driver chip such as ULN2003A or the like.

The stepping motor ports CN15 to CN16 may be connected to corresponding stepping motors, and the stepping motors may be used to drive a valve of the fresh air exchanger.

The input end of the parallel resistor RP1 is connected with the controller, and the output end of the parallel resistor RP1 is respectively connected with the 10-12 end and the 14 end of the IO port expansion chip U7; ends 1-7 of the IO port expansion chip U7 are respectively connected with ends 2-8 of the stepping motor driving chip U9, and ends 15-18 of the stepping motor driving chip U9 are respectively connected with ends 1-4 of the stepping motor interface CN 15; the 5 end of the stepping motor interface CN15 is connected with a 12V power supply, and the 11-14 ends of the stepping motor driving chip U9 are respectively connected with the 1-4 ends of the stepping motor interface CN 16; the 16 ends of the IO port expansion chip U7 are respectively connected with the 5V power supply and the first end of the capacitor C24, the second end of the capacitor C24 is grounded, the 5 ends of the stepping motor interface CN16 are connected with the 12V power supply, the 10 ends of the stepping motor driving chip U9 are respectively connected with the 12V power supply and the second end of the capacitor C25, and the first end of the capacitor C25 is respectively connected with the 9 ends of the stepping motor driving chip U9 and the 8 ends of the IO port expansion chip U7 and the ground.

The circuit structure of the exhaust valve control circuit is similar to that of the fresh air valve control circuit, and the circuit structure of the exhaust valve control circuit can refer to the circuit diagram and the circuit description of the fresh air valve control circuit, which are not repeated herein.

In the embodiment of the application, the IO port of the controller is extended by the IO port extension chip U7, the stepping motor is driven by the stepping motor driving chip, specifically, a fresh air valve of a fresh air inlet can be closed by the fresh air valve control circuit, and a valve of an exhaust outlet is closed by the exhaust valve control circuit, so that the fresh air exchanger is adjusted to be an air purification mode enabling internal circulation.

As shown in fig. 10, in an embodiment, the fresh air switch control circuit further includes a 485 communication circuit, and the 485 communication circuit includes a 485 communication chip U5, resistors R21 to R29, a resistor R4, a resistor NC, electrostatic discharge tubes RLSD1 to RLSD2, a capacitor C22, and a connection port CN13;

the terminal 1 of the 485 communication chip U5 is connected with the controller through a resistor R21, the terminal 2 of the 485 communication chip U5 is grounded through a resistor R22, the terminal 3 of the 485 communication chip U5 is connected with the controller through a resistor R23, and the terminal 4 of the 485 communication chip U5 is connected with the controller through a resistor R24; an 8 terminal of the 485 communication chip U5 is connected to the 3.3V power supply and the first terminal of the capacitor C22, a second terminal of the capacitor C22 is grounded, a 7 terminal of the 485 communication chip U5 is connected to the first terminal of the resistor R25 and the first terminal of the resistor R26, the second terminal of the resistor R25 is grounded, the second terminal of the resistor R26 is connected to the first terminal of the resistor R29, the cathode of the electrostatic discharge tube RLSD1 and the 1 terminal of the connection port CN13, the anode of the electrostatic discharge tube RLSD1 is grounded, a 6 terminal of the 485 communication chip U5 is connected to the first terminal of the resistor R27 and the first terminal of the resistor R28, the second terminal of the resistor R27 is connected to the second terminal of the resistor R29, the cathode of the electrostatic discharge tube RLSD2 and the 3 terminal of the connection port CN13, the second terminal of the resistor R28 is connected to the 3.3V power supply, the anode of the electrostatic discharge tube RLSD2 is grounded, a 4 terminal of the connection port CN13 is connected to the first terminal of the resistor NC and the second terminal of the discharge tube NC 12V 5R 4 is connected to the second terminal of the discharge tube NC 4.

The 485 communication circuit adopts an RS485 communication mode, and has the advantages of long communication distance, strong signal anti-interference capability, easiness in installation and wiring, simple networking mode and the like, the connection port CN13 is respectively connected with the 5V power supply and the 12V power supply, and the corresponding power supply can be selected according to the distance of a communication wire, specifically, when the distance between the fresh air exchanger and the liquid crystal controller is longer than 10 meters or even dozens of meters, 12V voltage can be selected for supplying power to the liquid crystal controller, the situation that the voltage is unstable due to the line loss and voltage drop generated on the wire by the communication wire length is avoided, and the reliability is improved; when the distance is less than 10 meters, the line loss of the communication wire is small, the voltage is reduced, 5V can be selected for supplying power to the liquid crystal controller, and the power supply power consumption is reduced.

In this application embodiment, in order to prevent that electrostatic surge from producing the impact damage to the IO mouth, through increase the static discharge tube at connection port to the protection IO mouth is not damaged by static, this application can be including being used for the second 485 communication circuit who is connected with the first 485 communication circuit that is connected with the liquid crystal controller and being used for with the centralized control center, and first 485 communication circuit and second 485 communication circuit's circuit structure is roughly the same, and its difference is only different at the equipment of being connected with connection port.

When the new trend switch adopted the centralized control mode, in order to save the cost, can stop using liquid crystal controller, through second 485 communication circuit remote communication direct control with read new trend switch parameter information.

The utility model provides a fresh air exchanger, which comprises a three-phase motor, a three-phase power supply and a fresh air exchanger control circuit as mentioned in any one of the above;

three input ends of the three-phase motor are respectively connected with a first connecting pin, a second connecting pin and a third connecting pin of the first port;

and three live wire ends of the three-phase power supply are respectively connected with a fifth connecting pin, a sixth connecting pin and a seventh connecting pin of the second port, and a zero wire end of the three-phase power supply is connected with an eighth connecting pin of the second port.

The utility model provides a fresh air exchanger, which comprises a single-phase motor, a single-phase power supply and a fresh air exchanger control circuit as mentioned in any one of the above;

two input ends of the single-phase motor are respectively connected with a third connecting pin and a fourth connecting pin of the first port, a fire wire end of the single-phase power supply is connected with a seventh connecting pin of the second port, and a zero wire end of the single-phase power supply is connected with an eighth connecting pin of the second port.

The fresh air exchanger control circuit and the fresh air exchanger have the advantages of being strong in universality, high in cost performance and strong in function, can be commonly used on various fresh air exchanger products on the market, and have good application prospects.

The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.

Claims (9)

1. A control circuit of a fresh air exchanger is characterized by comprising a first port, a second port, a controller, a motor rotating speed control circuit and a first voltage conversion circuit;

the first port comprises a first connection pin, a second connection pin, a third connection pin, a fourth connection pin and a fifth connection pin;

the second port comprises a fifth connection pin, a sixth connection pin, a seventh connection pin and an eighth connection pin;

when the first connecting pin, the second connecting pin and the third connecting pin are respectively connected with three input ends of a three-phase motor, the fifth connecting pin, the sixth connecting pin and the seventh connecting pin are respectively connected with three live wire ends of a three-phase power supply, and the eighth connecting pin is connected with a zero wire end of the three-phase power supply;

when the third connecting pin and the fourth connecting pin are respectively connected with two input ends of a single-phase motor, the seventh connecting pin is connected with a live wire end of a single-phase power supply, and the eighth connecting pin is connected with a zero wire end of the single-phase power supply;

a first input end of the first voltage conversion circuit is connected with the seventh connecting pin, and a second input end of the first voltage conversion circuit is connected with the eighth connecting pin;

the controller is respectively connected with the first voltage conversion circuit and the motor rotating speed control circuit; and the motor rotating speed control circuit is connected with the fifth connecting pin.

2. The fresh air exchange machine control circuit according to claim 1, characterized in that: the first voltage conversion circuit includes: the circuit comprises a fuse, a voltage dependent resistor, a safety capacitor, a common mode inductor, a thermistor and a first voltage conversion module;

the first end of fuse with the seventh connection pin is connected, the second end of fuse respectively with the second end of piezo-resistor, the second end of ann rule electric capacity with the second end of common mode inductance is connected, the first end of piezo-resistor with the eighth connection pin the first end of ann rule electric capacity with the first end of common mode inductance is connected, the third end of common mode inductance is connected with the first input of voltage conversion module, the fourth end of common mode inductance is connected with the first end of thermistor, the second end of thermistor is connected with the second input of voltage conversion module, the output of voltage conversion module exports first voltage to new trend switch.

3. The fresh air switch control circuit according to claim 2, wherein: the first voltage conversion circuit further comprises a first electrolytic capacitor, a second electrolytic capacitor, a third electrolytic capacitor, a first inductor and an electrostatic discharge tube;

the output end of the first voltage conversion module is respectively connected with the anode of the first electrolytic capacitor and the first end of the inductor, the first end of the inductor is respectively connected with the anode of the second electrolytic capacitor, the cathode of the electrostatic discharge tube and the anode of the third electrolytic capacitor, the anode of the third electrolytic capacitor is connected with the fresh air exchanger, and the second end of the first electrolytic capacitor, the cathode of the second electrolytic capacitor, the anode of the electrostatic discharge tube and the cathode of the third electrolytic capacitor are grounded.

4. The fresh air switch control circuit according to claim 3, wherein: the circuit also comprises a second voltage conversion circuit for converting the first voltage into a second voltage, wherein the second voltage is smaller than the first voltage;

the second voltage conversion circuit comprises a first capacitor, a second inductor, a diode and a second voltage conversion module;

the input end of the second voltage conversion module is respectively connected with the first end of the first capacitor and the anode of the third electrolytic capacitor, and the second end of the first capacitor is grounded; and a first output end of the second voltage conversion module is respectively connected with a first end of the second inductor and a cathode of the diode, and an anode of the diode is grounded.

5. The fresh air switch control circuit according to claim 1, wherein: the motor rotating speed control circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first optocoupler, a second capacitor, a third capacitor, a fourth capacitor and a triode;

the anode of the light emitting diode of the first optocoupler is respectively connected with a power supply and the first end of a fourth capacitor, the second end of the fourth capacitor is grounded, and the cathode of the light emitting diode of the optocoupler is connected with a controller through a first resistor;

the base of the phototriode of the first optocoupler is connected with the anode of the diode, the cathode of the diode is respectively connected with the second end of the second capacitor, the first end of the second resistor and the first end of the third resistor are connected, the first end of the second capacitor is grounded, the second end of the second resistor is respectively connected with the collector of the phototriode of the first optocoupler, the first end of the third capacitor and the first end of the fourth resistor are connected, the second end of the third capacitor and the emitter of the phototriode are grounded, the second end of the fourth resistor is connected with the base of the triode, the collector of the triode is respectively connected with the second ends of the motor and the third resistor, and the emitter of the triode is grounded.

6. The fresh air switch control circuit according to claim 5, wherein: the motor rotating speed feedback circuit is also included;

the motor rotating speed feedback circuit comprises a fifth capacitor, a sixth capacitor, a fifth resistor, a sixth resistor, a seventh resistor and a second optocoupler;

the anode of the light emitting diode of the second optocoupler is respectively connected with the first end of a fifth capacitor and the first end of a fifth resistor, the second end of the fifth capacitor is grounded, the second end of the fifth resistor is connected with a power supply, the cathode of the light emitting diode of the second optocoupler is connected with the first end of a sixth resistor, and the second end of the sixth resistor is connected with the feedback signal output end of the motor; the collector electrode of the phototriode of the second optocoupler is respectively connected with the first end of the sixth capacitor and the power supply, the second end of the sixth capacitor is grounded, the emitter electrode of the phototriode of the second optocoupler is respectively connected with the controller and the first end of the seventh resistor, and the second end of the seventh resistor is grounded.

7. The fresh air switch control circuit according to claim 1, wherein: the fresh air exchanger control circuit also comprises a radio frequency receiving circuit;

the radio frequency receiving circuit comprises a digital modulation and demodulation chip, a crystal oscillator, a frequency-selective filter network and an antenna, wherein the frequency-selective filter network comprises a third inductor, a fourth inductor, a fifth inductor, a seventh capacitor and an eighth capacitor;

the first input end of the digital modulation and demodulation chip is respectively connected with the first end of a third inductor and the first end of a fourth inductor, the second end of the fourth inductor is connected with the first end of a seventh capacitor, the second end of the seventh capacitor is respectively connected with the first end of an eighth capacitor and an antenna, the second end of the third inductor is respectively connected with the second input end of the digital modulation and demodulation chip and the first end of a fifth inductor, the second end of the fifth inductor is respectively connected with the first end of the eighth capacitor, and the second end of the eighth capacitor is grounded; the output end of the digital modulation and demodulation chip is connected with the controller.

8. A new trend switch, its characterized in that: comprising a three-phase motor, a three-phase power supply and a fresh air switch control circuit according to any of claims 1 to 6;

three input ends of the three-phase motor are respectively connected with a first connecting pin, a second connecting pin and a third connecting pin of the first port;

and three live wire ends of the three-phase power supply are respectively connected with a fifth connecting pin, a sixth connecting pin and a seventh connecting pin of the second port, and a zero wire end of the three-phase power supply is connected with an eighth connecting pin of the second port.

9. A new trend switch, its characterized in that: comprising a single-phase motor, a single-phase power supply and a fresh air exchange control circuit according to any one of claims 1 to 6;

two input ends of the single-phase motor are respectively connected with a third connecting pin and a fourth connecting pin of the first port, a fire wire end of the single-phase power supply is connected with a seventh connecting pin of the second port, and a zero wire end of the single-phase power supply is connected with an eighth connecting pin of the second port.

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