CN213276394U - Control circuit of temperature controller - Google Patents

Abstract

The application relates to a control circuit of a temperature controller, which comprises a control device, a first switching circuit, a second switching circuit and a third switching circuit, wherein the control device is used for outputting a first switching signal, a second switching signal and a third switching signal; the first passage switcher is connected with the controller and the electric valve and used for receiving and responding to a first switching signal to control the energization of a valve opening circuit of the electric valve and the outage of a valve closing circuit at the same time or the energization of the valve closing circuit and the outage of the valve opening circuit at the same time; the second channel switcher is connected with the controller and the fan and used for receiving and responding to a second switch signal to enter a power supply state and control the high-speed line of the fan to be disconnected or exit the power supply state and control the high-speed line of the fan to be electrified; and the third path switcher is connected with the controller and the fan and used for receiving and responding to a third switch signal so as to control the low-speed line of the fan to be electrified and the medium-speed line to be disconnected simultaneously or the low-speed line to be disconnected and the medium-speed line to be electrified simultaneously. The application has the effect of reducing the use amount of hardware so as to reduce the production cost.

Description

Control circuit of temperature controller

Technical Field

The application relates to the field of temperature controllers, in particular to a control circuit of a temperature controller.

Background

At present, in a fan coil system, when a refrigerant pipeline and a heat medium pipeline respectively and independently operate, the same pipeline system is adopted, namely hot water and return water are used for heating, in summer, the same pipeline is used for conveying chilled water and the return water, and the cold and heat sources are switched in a chilled water pump room and a heat exchange station, namely, the system is called a double-pipe system. The double-pipe system can save investment cost and reduce maintenance amount, and is a control mode commonly adopted in air-conditioning systems.

An electric valve is commonly used in a central air conditioner, belongs to a central air conditioner terminal control product, is used as a control fan coil, is used as an execution component for controlling water flow in the fan coil, and is controlled by a central air conditioner temperature controller. And the valve opening circuit or the valve closing circuit of the electric valve only needs to be electrified in one way, the electric valve is opened when the valve opening circuit is electrified, and the electric valve is closed when the valve closing circuit is electrified, so that the valve opening circuit and the valve closing circuit of the general electric valve are respectively controlled by adopting the relays independently.

The fans of the central air conditioner are generally three-speed fans, and can be divided into three stages of high-speed, medium-speed and low-speed gears according to the classification of the rotating speed or output power of the fans, the three stages of gears correspond to a high-speed circuit, a medium-speed circuit and a low-speed circuit, the high-speed circuit, the medium-speed circuit and the low-speed circuit are generally independently controlled by three relays, namely the fans work in a high-speed state when the high-speed circuit is electrified, the fans work in a medium-speed state when the medium-speed circuit is electrified, and the fans work in a low-speed.

In view of the above-mentioned related art, the inventor believes that there is a defect that the existing central air-conditioning thermostat needs to be equipped with at least five relays, which results in excessive production cost.

SUMMERY OF THE UTILITY MODEL

In order to reduce cost, this application provides a control circuit of temperature controller.

The application provides a control circuit of temperature controller adopts following technical scheme: a control circuit of a temperature controller comprises a temperature controller,

the control device is used for outputting a first switching signal, a second switching signal and a third switching signal;

the first passage switcher is connected with the controller and the electric valve and used for receiving and responding to a first switching signal to control the energization of a valve opening circuit of the electric valve and the outage of a valve closing circuit at the same time or the energization of the valve closing circuit and the outage of the valve opening circuit at the same time;

the second channel switcher is connected with the controller and the fan and used for receiving and responding to a second switch signal to enter a power supply state and control the high-speed line of the fan to be disconnected or exit the power supply state and control the high-speed line of the fan to be electrified;

the third circuit switcher is connected with the controller and the fan and used for receiving and responding to a third switch signal so as to control the low-speed circuit of the fan to be electrified and the medium-speed circuit to be disconnected simultaneously or the low-speed circuit to be disconnected and the medium-speed circuit to be electrified simultaneously;

the second path switching device is connected to the third path switching device in a power supply state and supplies electric power for energizing the low-speed line or the medium-speed line to the third path switching device.

By adopting the technical scheme, the first passage switcher is used for receiving the first switching signal of the controller to realize the electrification switching of the valve opening circuit or the valve closing circuit so as to control the electric valve; the second channel switcher is used for receiving a second switch signal of the controller to realize switching of a power supply state or electrifying a high-speed line of the fan; the third circuit switcher is used for receiving a third switch signal of the controller to realize the electrification switching of a medium-speed circuit and a low-speed circuit of the fan, so that the function of more than five single-pole single-throw relays is replaced, and meanwhile, the using number of switch elements is reduced, thereby reducing the cost; and the second channel switcher is connected with the third channel switcher in the power supply state to provide electric energy for electrifying the low-speed line or the medium-speed line for the second channel switcher, so that only one line can be electrified in the high-speed line, the medium-speed line and the low-speed line of the fan at the same time, and the influence on the normal operation of the fan due to signal errors of the control device is avoided.

Preferably, the first path switcher comprises a first relay, the second path switcher comprises a second relay, the third path switcher comprises a third relay, and the first relay, the second relay and the third relay all adopt single-pole double-throw relays;

one ends of the coil of the first relay, the coil of the second relay and the coil of the third relay are connected with a voltage input end, and the other ends of the coil of the first relay, the coil of the second relay and the coil of the third relay are respectively connected with signal output ends of a control device;

the moving contact of the first relay is connected with a live wire, and a normally closed contact and a normally open contact of the first relay are respectively connected with a valve closing circuit and a valve opening circuit of the electric valve;

the movable contact of the second relay is used for drawing electric energy, and the normally closed contact and the normally open contact of the second relay are respectively connected with the movable contact of the third relay and the high-speed circuit of the fan;

and the normally closed contact and the normally open contact of the third relay are respectively connected with the low-speed line and the medium-speed line of the fan.

By adopting the technical scheme, when the first switch signal is a low level signal, the normally open contact of the first relay is closed, the open valve circuit is electrified, the electric valve is opened at the moment, and the movable contact of the second relay is electrified; if the second switch signal is controlled to output a low level signal, the normally open contact of the second relay is closed, the high-speed line of the fan is electrified, and the fan is lifted to a high-speed gear. If the second switch signal is controlled to output a high level signal, the high speed line is disconnected, the movable contact of the third relay is electrified, and a user can further control the low speed line to be electrified or the medium speed line to be electrified by controlling the third switch signal output, so that the multi-stage switching of the rotating speed gears of the fan is realized.

Preferably, the movable contact of the second relay is connected to a valve opening line of the electric valve.

Through adopting above-mentioned technical scheme, the movable contact of second relay and the open valve line connection of motorised valve to the fan is opened in step when this makes the motorised valve open, thereby makes refrigerant transmission and heat transfer process go on in step, promotes the practicality.

Preferably, the first relay, the second relay and the third relay are all of YQ501-DC12V type.

By adopting the technical scheme, the model YQ501-DC12V has the characteristic of low power consumption, so that the overall loss of the control circuit is reduced, and the production cost is reduced.

Preferably, the device further comprises a controller and a buzzer, one end of the buzzer is grounded, the other end of the buzzer is connected with a first triode and connected with an emitting electrode of the first triode, a collecting electrode of the first triode is connected with a voltage input end, and a base electrode of the first triode is connected with a signal output end of the controller through a third resistor.

Through adopting above-mentioned technical scheme, when control signal is low level signal, the buzzer sound production to this buzzer can provide sound feedback when the user controls the air conditioner at every turn, and convenience of customers distinguishes whether the air conditioner responds, thereby conveniently realizes functions such as adjusting the temperature.

Preferably, the controller is connected with a backlight source, the backlight source includes a light emitting diode, a switching tube, a sixth resistor and a seventh resistor, an anode of the light emitting diode is connected with the voltage input end through the seventh resistor, a cathode of the light emitting diode is connected with the input end of the switching tube, an output end of the switching tube is grounded, and a control electrode of the switching tube is connected with the signal output end of the controller through the sixth resistor.

Through adopting above-mentioned technical scheme, switch on when emitting diode receives the control signal of controller, high level voltage signal promptly, emitting diode circular telegram is luminous to light is shaded, makes things convenient for the night use of temperature controller.

Preferably, the switch tube includes a second triode, a base of the second triode is connected to the signal output end of the controller through a sixth resistor, a collector of the second triode is connected to the cathode of the light emitting diode, and an emitter of the second triode is grounded.

By adopting the technical scheme, the controller is used for controlling the on and off of the light emitting diode through the second triode, so that the backlight source is conveniently controlled to provide the light feedback signal.

Preferably, the controller is connected with a built-in sensor, the built-in sensor comprises a thermistor, a divider resistor, a third capacitor, a fourth resistor and a fifth resistor, the thermistor is connected with the divider resistor in series, one end of the divider resistor is grounded, one end of the divider resistor is connected with a voltage input end, the fourth resistor and the third capacitor are connected in parallel and are both connected in parallel at two ends of the thermistor, and one end of the thermistor connected with the divider resistor is connected with a signal input end of the controller through the fifth resistor.

Through adopting above-mentioned technical scheme, thermistor and divider resistance form bleeder circuit, and thermistor adopts the resistance that has the inverse temperature coefficient, and it has the characteristic that the higher the temperature of being heated the resistance is littleer, and the room temperature is higher promptly, and the voltage of controller signal input end input is lower more to this indoor temperature of monitoring makes things convenient for the user to carry out temperature regulation according to indoor actual temperature.

Drawings

FIG. 1 is an overall schematic diagram of an embodiment of the present application;

FIG. 2 is a schematic circuit diagram of a portion of an embodiment of the present application, showing primarily an infrared device;

FIG. 3 is a schematic diagram of a portion of an embodiment of the present application, showing primarily a buzzer;

FIG. 4 is a partial circuit schematic of an embodiment of the present application, showing primarily a built-in sensor;

FIG. 5 is a schematic diagram of a portion of an electrical circuit of an embodiment of the present application, showing primarily a backlight;

FIG. 6 is a schematic circuit diagram of a portion of an embodiment of the present application, showing primarily a key device;

fig. 7 is a partial circuit schematic diagram of the embodiment of the present application, mainly showing a control device.

Description of reference numerals: 1. an infrared device; 2. a buzzer; 3. a built-in sensor; 4. a backlight source; 41. a switching tube; 5. a key device; 6. and a controller.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses a control circuit of a temperature controller, which is used for realizing interaction with a user so as to conveniently control various functions of an air conditioner. Referring to fig. 1, the control circuit includes a controller 6, a backlight source 4, a built-in sensor 3, an infrared device 1, a buzzer 2, and a key device 5, where the backlight source 4 is used to provide backlight to a display screen, so as to facilitate the use of the temperature controller at night. The built-in sensor 3 comprises a temperature sensor for monitoring the temperature parameter of the area where the temperature controller is located, and the infrared device 1 is used for realizing the remote control function of the air conditioner, so that the control of each function is facilitated.

Referring to fig. 1 and 2, the infrared device 1 includes a remote controller and a receiver connected to the remote controller, and the remote controller (not shown) may be a YKR-H008 type having infrared transmitting and receiving functions, and is configured to respond to a user's motion command to send an infrared signal. The receiver comprises an HS0038B infrared receiving head, a first capacitor C1 and a second capacitor C2, wherein a VCC end of the receiver is connected with a voltage input end through a first resistor R1, an OUT end of the receiver is respectively connected with one ends of the first capacitor C1 and a second resistor R2, the other end of the second resistor R2 is connected with a voltage output end, the other end of the first capacitor C1 is respectively connected with a GND end of the HS0038B infrared receiving head and one end of a second capacitor C2, and the other end of the second capacitor C2 is connected between the first resistor R1 and the VCC end of the HS0038B infrared receiving head. When the remote controller works, the HS0038B infrared receiving head receives an infrared signal of the remote controller, converts the infrared signal into a demodulation signal through the demodulation function of the infrared receiving head and sends the demodulation signal to the controller 6, and the controller 6 outputs an operation instruction according to the demodulation signal to control various functions of the air conditioner.

Referring to fig. 1 and 3, one end of the buzzer 2 is grounded, the other end of the buzzer is connected to a first triode Q1 and is connected to an emitter of a first triode Q1, a collector of the first triode Q1 is connected to a voltage input end, and a base of the first triode Q1 is connected to a signal output end of the controller 6, i.e., a TONE end, through a third resistor R3, and is configured to receive and respond to an operation instruction of the controller 6 to control the buzzer 2 to output a sound feedback signal. When the control signal is a low level signal, the buzzer 2 sounds, so that sound feedback is provided when a user presses a key, the user can conveniently distinguish whether the air conditioner responds, and functions such as temperature regulation and the like are conveniently realized.

Referring to fig. 3 and 4, the built-in sensor 3 includes a thermistor RT, a voltage dividing resistor RX, a third capacitor C3, a fourth resistor R4, and a fifth resistor R5, the thermistor RT is connected in series with the voltage dividing resistor RX, and one end of the voltage dividing resistor RX is connected to a voltage input terminal. The fourth resistor R4 and the third capacitor C3 are connected in parallel and are both connected in parallel to two ends of the thermistor RT, and one end of the thermistor RT connected to the voltage dividing resistor RX is connected to a signal input end of the controller 6, i.e., an AD1 end, through a fifth resistor R5. Thermistor RT adopts the resistance of anti temperature coefficient, and built-in sensor 3 is through thermistor RT and divider resistor RX's partial pressure principle for the voltage signal that is inverse relation with temperature is received to the signal input part of controller 6, thereby monitors the appointed region, indoor temperature parameter promptly, and convenience of customers carries out temperature regulation according to indoor actual temperature.

Referring to fig. 3 and 5, the backlight 4 includes a light emitting diode D1, a switching tube 41, a sixth resistor R6, and a seventh resistor R7, the switching tube 41 employs a second transistor Q2, an anode of the light emitting diode D1 is connected to a voltage input end through a seventh resistor R7, and a cathode of the light emitting diode D1 is connected to a collector of a second transistor Q2. The emitter of the second triode Q2 is grounded, and the base thereof is connected with the signal output end of the controller 6, namely the BL end, through the sixth resistor R6, and is used for receiving the control signal of the controller 6 to output the optical feedback signal, namely, to control the light emitting diode D1 to emit light, thereby lighting the backlight and facilitating the use of the temperature controller at night.

Referring to fig. 3 and 6, the plurality of key devices 5 are provided, and each of the key devices 5 includes a push switch, a debounce capacitor, pull-up resistors, and current limiting resistors, where the push switch is JB1, JB2, JB3, JB4, and JB5 in the drawing, the debounce capacitor is C4, C5, C6, C7, and C8 in the drawing, the pull-up resistor is R8, R9, R10, R11, and R12 in the drawing, and the current limiting resistor is R13, R14, R15, R16, and R17 in the drawing. One end of the button switch is connected with the voltage input end through a pull-up resistor, the other end of the button switch is grounded, and the debouncing capacitor is connected in parallel with two ends of the button switch and used for reducing the phenomenon of signal error reporting caused by mechanical key shaking. The connection point of the push-button switch and the pull-up resistor is connected to the signal input end of the controller 6, namely the KEY1, KEY2, KEY3, KEY4 and KEY5 ends through the current-limiting resistor. When a user presses a corresponding button switch, that is, the button device 5 receives a button signal, the signal input end of the controller 6 receives a control signal, so as to output an operation instruction for controlling the air conditioner, so that the air conditioner performs corresponding function feedback, thereby realizing the control of the temperature controller and the air conditioner.

Referring to fig. 7, the control circuit further includes a first path switch including a first Relay1, a second path switch including a second Relay2, a third path switch including a third Relay3, and a control device. The first Relay1, the second Relay2 and the third Relay3 are all of YQ501-DC12V models and are designed in a single-pole double-throw mode. And the control device is used for outputting a first switching signal, a second switching signal and a third switching signal.

One ends of the coil of the first Relay1, the coil of the second Relay2 and the coil of the third Relay3 are all connected to a 12V voltage input end, and the other ends are respectively connected with signal output ends RL1, RL3 and RL2 of the MCU. The signal output terminals RL1, RL3 and RL2 are used for controlling the relay coil to be electrified, thereby controlling the relay switching contact. The signal output terminal RL1 is configured to output a first switching signal, the signal output terminal RL2 is configured to output a third switching signal, and the signal output terminal RL3 is configured to output a second switching signal.

Because the air conditioner generally adopts two-pipe two-line valve, namely the opening circuit or closing circuit of the electric valve only needs to be electrified at the same time, the electric valve is opened when the opening circuit is electrified, and the electric valve is closed when the closing circuit is electrified. Therefore, the movable contact of the first Relay1 is connected to the live wire, and the normally closed contact and the normally open contact of the first Relay are connected to the valve closing line VAL2 and the valve opening line VAL1 of the electric valve, respectively, whereby the opening and closing of the electric valve are controlled by controlling the signal output of the RL 1.

And the fan of the air conditioner generally adopts a three-speed fan, and the three-speed fan has three stages of high-speed, medium-speed and LOW-speed gears, and the three stages of gears correspond to a high-speed line HI, a medium-speed line MED and a LOW-speed line LOW. And the movable contact of the second Relay2 is connected with the valve opening line VAL1 of the electric valve, the normally closed contact and the normally open contact of the second Relay2 are respectively connected with the movable contact of the third Relay3 and the high-speed line HI, and the normally closed contact and the normally open contact of the third Relay3 are respectively connected with the LOW-speed line LOW and the medium-speed line MED. The user can control the high-speed line HI to be electrified or supply power to the movable contact of the third Relay Relay3 by controlling the RL3 signal output, and the user can further control the LOW-speed line LOW to be electrified or the middle-speed line MED to be electrified by controlling the RL2 signal output, so that the switching of the high-speed line HI, the middle-speed line MED and the LOW-speed line LOW of the fan is realized.

Because the three-speed fan only needs to be maintained at one gear of the three-level gears of high speed, medium speed and LOW speed simultaneously, the switching of the gears can be realized through the cooperation of the second Relay Relay2 and the third Relay Relay3, thereby reducing the using quantity of the relays, compared with five common single-pole single-throw relays which respectively and independently control the high-speed line HI, the medium-speed line MED, the LOW-speed line LOW and the valve opening line and the valve closing line of an electric valve, the manufacturing cost is reduced, the hardware occupation space is saved, and the light weight of the temperature controller is conveniently realized.

The implementation principle of the embodiment is as follows: when partial keys of the temperature controller are damaged or malfunction occurs, a user can start an infrared remote control mode, such as starting infrared remote control software of a mobile phone, and aim at an infrared receiving head of the temperature controller to control the mobile phone to output infrared signals, at the moment, the infrared receiving head receives the infrared signals of the remote controller, converts the infrared signals into demodulation signals through the demodulation function of the infrared receiving head and sends the demodulation signals to the controller 6, and the controller 6 outputs operation instructions according to the demodulation signals to control various functions of the air conditioner. And when the controller 6 outputs an operation instruction, the TONE end outputs a pulse signal to control the buzzer to sound, thereby providing sound feedback; meanwhile, the BL end of the controller 6 outputs a high level signal, so that the switching tube 41 is turned on and the light emitting diode is turned on, and at the moment, the backlight of the display screen of the temperature controller is turned on to provide optical feedback, so that a user can check various parameters of the air conditioner at night.

When the cooling/heating function of the air conditioner needs to be started, a user only needs to control the RL1 through the temperature controller to output a low-level signal, at the moment, the normally open contact of the first Relay Relay1 is closed, the valve opening circuit VAL1 is electrified, at the moment, the electric valve is opened, and at the same time, the movable contact of the second Relay Relay2 is electrified. At this time, if the RL3 is controlled to output a low level signal, the normally open contact of the second Relay2 is closed, the high-speed line HI of the fan is electrified, and the fan is lifted to a high-speed gear. If the RL3 is controlled to output a high level signal, the HI of the high-speed line is disconnected, the movable contact of the Relay Relay3 is electrified, and the user can further control the LOW of the LOW-speed line or the MED of the medium-speed line to be electrified by controlling the RL2 signal output, so that the multi-stage switching of the rotating speed gear of the fan is realized.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A control circuit of a temperature controller is characterized by comprising a control device, a first switch circuit, a second switch circuit and a third switch circuit, wherein the control device is used for outputting a first switch signal, a second switch signal and a third switch signal;

the first passage switcher is connected with the controller (6) and the electric valve and used for receiving and responding to a first switch signal to control the energization of a valve opening circuit of the electric valve and the outage of a valve closing circuit at the same time or the energization of the valve closing circuit and the outage of the valve opening circuit at the same time;

the second channel switcher is connected with the controller (6) and the fan and used for receiving and responding to a second switch signal to enter a power supply state and simultaneously control the disconnection of a high-speed line of the fan or quit the power supply state and simultaneously control the electrification of the high-speed line of the fan;

the third circuit switcher is connected with the controller (6) and the fan and used for receiving and responding to a third switch signal so as to control the low-speed circuit of the fan to be electrified and the medium-speed circuit to be disconnected simultaneously or the low-speed circuit to be disconnected and the medium-speed circuit to be electrified simultaneously;

the second path switching device is connected to the third path switching device in a power supply state and supplies electric power for energizing the low-speed line or the medium-speed line to the third path switching device.

2. The control circuit of the thermostat of claim 1, wherein the first passage switcher includes a first relay, the second passage switcher includes a second relay, the third passage switcher includes a third relay, and the first relay, the second relay and the third relay are all single-pole double-throw relays;

one ends of the coil of the first relay, the coil of the second relay and the coil of the third relay are connected with a voltage input end, and the other ends of the coil of the first relay, the coil of the second relay and the coil of the third relay are respectively connected with signal output ends of a control device;

the moving contact of the first relay is connected with a live wire, and a normally closed contact and a normally open contact of the first relay are respectively connected with a valve closing circuit and a valve opening circuit of the electric valve;

the movable contact of the second relay is used for drawing electric energy, and the normally closed contact and the normally open contact of the second relay are respectively connected with the movable contact of the third relay and the high-speed circuit of the fan;

and the normally closed contact and the normally open contact of the third relay are respectively connected with the low-speed line and the medium-speed line of the fan.

3. The control circuit of a thermostat of claim 2, wherein the movable contact of the second relay is connected to a valve opening line of an electrically operated valve.

4. The control circuit of the temperature controller according to claim 2, wherein the first relay, the second relay and the third relay are of YQ501-DC12V type.

5. The control circuit of the temperature controller according to claim 1, further comprising a controller (6) and a buzzer (2), wherein one end of the buzzer (2) is grounded, the other end of the buzzer is connected to a first triode and connected to an emitter of the first triode, a collector of the first triode is connected to the voltage input terminal, and a base of the first triode is connected to the signal output terminal of the controller (6) through a third resistor.

6. The control circuit of a thermostat according to claim 1, wherein the controller (6) is connected with the built-in sensor (3), the built-in sensor (3) comprises a thermistor, a voltage dividing resistor, a third capacitor, a fourth resistor and a fifth resistor, the thermistor is connected with the voltage dividing resistor in series, one end of the voltage dividing resistor is grounded, one end of the voltage dividing resistor is connected with the voltage input end, the fourth resistor and the third capacitor are connected in parallel and are both connected in parallel with both ends of the thermistor, and one end of the thermistor connected with the voltage dividing resistor is connected with the signal input end of the controller (6) through the fifth resistor.

7. The control circuit of the temperature controller according to claim 1, wherein the controller (6) is connected to a backlight source (4), the backlight source (4) comprises a light emitting diode, a switching tube (41), a sixth resistor and a seventh resistor, an anode of the light emitting diode is connected to the voltage input end through the seventh resistor, a cathode of the light emitting diode is connected to the input end of the switching tube (41), an output end of the switching tube (41) is grounded, and a control electrode of the light emitting diode is connected to the signal output end of the controller (6) through the sixth resistor.

8. The control circuit of the thermostat according to claim 7, wherein the switching transistor (41) comprises a second transistor, a base of the second transistor is connected to the signal output terminal of the controller (6) through a sixth resistor, a collector of the second transistor is connected to the cathode of the light emitting diode, and an emitter of the second transistor is grounded.

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