TWM510429U - AC/DC power conversion control module of central air conditioning system - Google Patents

Description

AC/DC power conversion control module for central air conditioning system

This creation is a technology related to the central air conditioning system. It can be directly used to control the DC brushless motor in the case where the conventional AC air conditioning system does not need to replace the old pipe wiring and control interface. Drive the blower.

According to the general air conditioning system in the general building, the power consumption is very high and the energy is wasted, mainly because the air blowers used in the traditional central air conditioning system are driven by the AC single-phase three-speed motor, and the AC single-phase three-speed motor. The motor is a low-efficiency, high-power motor.

When the traditional central air-conditioning system is provided with a large number of ventilation ducts in each floor space to communicate with the indoors, and a blower is respectively arranged at the outlet end of each ventilation duct to achieve the effect of adjusting the room temperature and circulating air, the above-mentioned low efficiency, The high-power consumption of the AC single-phase three-speed motor is the main cause of the extremely high power consumption.

In contrast, the current DC brushless motor on the market is not only efficient but also low in power consumption. If the conventional fan that uses the AC single-phase three-speed motor can be driven by a DC brushless motor, the high power consumption of the air conditioning system can be improved immediately. The quantity, in order to achieve the purpose of energy saving and environmental protection.

The above-mentioned conventionally used AC single-phase three-speed motor blower is driven by a DC brushless motor. The principle seems easy, but it is difficult to implement in practice. The following describes the common central air-conditioning system blower control circuit structure. Applying for difficulties.

As shown in the first figure, the air blower of the traditional central air conditioning system is driven by an alternating current single-phase three-speed motor 1 powered by an alternating current (AC) power source, through an alternating current (AC). The controller 2 controls its high, medium and low speeds, and controls the interface 3, such as automatic control of the temperature sensor, manual control of the torque switch, etc., to provide different speed signals to the AC controller 2, thereby controlling the AC single-phase three-speed motor. 1 speed.

The general implementation of the alternating current (AC) controller 2 is to control the conduction and disconnection of the power circuit by using a plurality of general relays or a relay-single pole double throw (Relay-SPDT) to switch between different switches. The power supply line controls the high, medium and low speeds of the AC single-phase three-speed motor 1.

According to the above circuit architecture, since the conventional air conditioning system uses an alternating current signal, and the direct current brushless motor cannot read the alternating current signal, all the pipeline wiring must be disassembled and replaced during construction to provide a DC brushless motor. The cost of replacement is not only a waste, but the entire replacement of wiring is a complicated project; therefore, how to change the old air conditioning system to a higher level with minimum cost and minimum engineering construction. The power and low-power DC brushless motor does not need to change the user's existing operating habits, and has always been a problem that the industry needs to break through.

In view of this, the creator has created a kind of "AC/DC power conversion control module for central air-conditioning system" based on the experience of many years of relevant industries. It can be changed without replacing the old control interface and pipeline. The DC brushless motor is used to drive the blower to achieve the benefits of power saving, energy saving and environmental protection.

The purpose of this creation is to provide a "AC/DC power conversion control module for central air conditioning systems", which is mainly installed between the AC controller of the air conditioning system and the DC brushless motor, so that the traditional air conditioning system does not need to be replaced with the old one. Under the pipeline wiring and control interface, the AC signal in the air conditioning system can be converted into a DC signal by the present invention, so that the AC controller can drive the blower through the DC brushless motor.

In order to achieve the above object, the "AC/DC power conversion control module of the central air conditioning system" is used between an AC controller and a DC brushless motor in an air conditioning system; wherein the AC controller is connected to an AC power, DC The brushless motor has a speed control input pin and a power pin, and the AC/DC power conversion control module includes at least one isolation control module and a DC power supply, wherein the isolation control module and the AC power The controller is electrically connected, and at least includes a resistor-capacitor step-down circuit for converting an alternating current signal transmitted from the alternating current controller into a direct current signal, a filter capacitor capable of filtering and stabilizing the direct current signal, and an output of the direct current signal to the DC signal a DC brushless motor speed control input pin optical coupling field effect relay or optical coupling transistor; the DC power supply can convert AC power into a DC power supply, and has an input connected to the isolation control module, and at least An output is connected to the DC brushless motor. When the isolation control module outputs the corresponding DC signal to the DC brushless motor and the DC power supply, the DC power supply is used to supply the power required for the DC brushless motor to operate.

It should be noted that the resistor-capacitor step-down circuit in the above isolation control module has been conceived by the creator of the present invention by using a bridge rectifier. However, since the bridge rectifier is not stepped down by the alternating current output from the AC controller, The working environment is continuously overloaded, which seriously degrades the life of the isolation control module, and the spur generated when the motor speed is switched, so that the isolation control module is in an unstable state; The step-down circuit can effectively overcome the above-mentioned lack of using the bridge rectifier by utilizing the capacitive current limiting effect of the resistor and the capacitor.

In the implementation, the isolation control module can be a group, directly connected to the single speed signal output by the AC controller, and after outputting, the corresponding DC signal can be output, or the three groups can be respectively coupled to the output of the AC controller. , medium and low speed signals, after conversion, output the corresponding DC signal to the DC brushless motor and DC power supply. In conjunction with this embodiment, the output of the DC power supply can supply one or three electrically driven brushless DC motors operating at a single speed or three high, medium, and low speeds.

In addition, the DC power supply can be provided with a resistor between the input end and the isolation control module, and the different speed signals output by the isolation control module are identified by the change of the resistance of the resistor to output the DC brushless motor. Required electricity When the isolation control module inputs the output DC speed signal to the speed control input pin of the DC brushless motor with a preset motor speed control voltage (VSP) value, the DC power supply is used to supply the corresponding power. The DC brushless motor can be operated at the set speed.

With the above structure, the creation uses the isolation control module as the core circuit for controlling the air conditioning system, and can exchange the old AC power supply to the AC power source, and utilize the RC voltage drop circuit to generate capacitive reactance to limit the working current, so as to isolate The control module can convert the control signal input by the AC controller into the set DC brushless motor speed control voltage (VSP), and send it to the speed control input pin of the DC brushless motor to achieve DC brushless operation. The effect of motor single speed control or multi-speed control.

Compared with the prior art, the creation of the "AC/DC power conversion control module of the central air conditioning system" enables the air conditioning system to be isolated and controlled by the creation of the air conditioning system without replacing the old pipeline wiring and the AC controller. The module converts the AC signal outputted by the AC controller into a DC signal and amplifies it to control the DC brushless motor blower, achieving energy saving, power saving and environmental protection purposes, and at the same time has the advantages of cost saving and simple construction.

In the following, according to the technical means of the creation, the implementation method suitable for the creation is listed, and the description is as follows:

10‧‧‧AC controller

11‧‧‧ Signal output

20‧‧‧DC brushless motor

21‧‧‧Speed control input pin

22‧‧‧Power pin

30‧‧‧Isolation Control Module

31‧‧‧Resistor-capacitor circuit

32‧‧‧Filter capacitor

33‧‧‧Photocoupled field effect relay

34‧‧‧Optically coupled transistor

40‧‧‧DC power supply

41‧‧‧ input

42‧‧‧ Output

43‧‧‧resistance

The first picture: Schematic diagram of the control mode of the blower driven by the traditional AC motor.

The second picture: the schematic diagram of the DC motor control DC motor (1).

The third picture: the schematic diagram of the DC motor for controlling the conversion of AC and DC signals (2).

As shown in the second and third figures, the "air conditioning system power control device" is used between the AC controller 10 and the DC brushless motor 20 in the air conditioning system; wherein the AC controller 10 is connected to the AC power, and the signal output is The signals outputted by the terminal 11, the pipeline wiring and the control interface are all AC signals, and the control device of the present invention includes at least one isolation control module 30 and a DC power supply. The device 40 is connected to the signal output terminal 11 of the AC controller 10 and electrically connected to the speed control input pin 21 of the DC brushless motor 20, and includes a resistor-capacitor step-down circuit 31. a filter capacitor 32, an optically coupled field effect relay (PHOTOMOS RELAY) 33 (second diagram) or an optically coupled transistor 34 (third diagram); the resistor-capacitor step-down circuit 31 transmits the signal output terminal 11 of the alternating current controller 10 The incoming AC signal is converted into a DC signal, and is regulated by the filter capacitor 32, and then outputted to the DC brushless motor 20 via the optical coupling field effect relay 33 or the optical coupling transistor 34. The foot 21 and the input 41 of the DC power supply 40 actuate the DC brushless motor 20 and the DC power supply 40.

It should be noted that the resistor-capacitor buck circuit 31 used in this creation does not work as a traditional bridge rectifier. The bridge rectifier will continue to operate under the condition that the AC output from the AC controller is not stepped down. In the overload state, the life of the isolation control module is seriously degraded, and the glitch generated when the motor speed is switched, the isolation control module is in an unstable state. The resistor-capacitor step-down circuit used in this creation can utilize the resistance and current limiting of the resistor and capacitor to effectively overcome the above-mentioned lack of bridge rectifier.

In the implementation, the isolation control module 30 can be a group (second diagram), directly connected to the single speed signal output by the AC controller 10, and after outputting, the corresponding DC signal can be output, or can be three groups (third diagram) The high-, medium-, and low-speed signals output from the AC controller 10 are respectively connected, and the corresponding DC signals are outputted to the DC brushless motor 20 and the DC power supply 40.

The DC power supply 40 has an input end 41 electrically connected to the isolation control module 30, and at least one output 42 is connected to the power pin 22 of the DC brushless motor 20 to provide power. When the corresponding DC signal is outputted to the DC brushless motor 20 and the DC power supply 40, the DC power supply 40 can supply the power required for the operation of the DC brushless motor 20. In conjunction with the foregoing embodiment, the DC power supply 40 can supply one or three types of electrically driven brushless DC motors 20 operating at a single speed or three speeds: high, medium, and low.

In addition, the DC power supply 40 can be connected between the input terminal 41 and the isolation control module 30 to provide a resistor 43 to be connected. The resistance of the resistor 43 is used to identify different speed signals output by the isolation control module 30. The power required for the operation of the DC brushless motor 20 is output; when the isolation control module 30 inputs the output DC speed signal to the speed control input pin 21 of the DC brushless motor 20 with a preset motor speed control voltage (VSP) value. When the DC power supply 40 is supplied with the corresponding power, the DC brushless motor 20 can be operated at the set rotation speed.

With the above configuration, the present invention uses the isolation control module 30 as the core circuit for controlling the air conditioning system, and uses the AC power supplied from the old AC controller 10 to take the small current to open the isolation control module 30, thereby isolating the control mode. The group 30 converts the control signal input from the AC controller 10 into the set speed control voltage (VSP) of the DC brushless motor 20 and sends it to the speed control input pin 21 of the DC brushless motor 20 to achieve DC brushless operation. The effect of motor 20 single speed control or multi speed control.

The above description of the embodiments and the drawings are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; the structures, devices, features, etc. of the present invention are similar or identical. It is the creation of this creation and the scope of the patent application. I hereby declare.

10‧‧‧AC controller

11‧‧‧ Signal output

20‧‧‧DC brushless motor

21‧‧‧Speed control input pin

22‧‧‧Power pin

30‧‧‧Isolation Control Module

31‧‧‧Resistor-capacitor circuit

32‧‧‧Filter capacitor

33‧‧‧Photocoupled field effect relay

40‧‧‧DC power supply

41‧‧‧ input

42‧‧‧ Output

43‧‧‧resistance

Claims (3)

An AC/DC power conversion control module of a central air conditioning system is used between an AC controller and a DC brushless motor in an air conditioning system; wherein the AC controller is connected to an AC power, and the DC brushless motor has a rotation speed Controlling the input pin and the power pin, the AC/DC power conversion control module includes at least one isolation control module, and a DC power supply, wherein the isolation control module is electrically connected to the AC controller, at least The utility model comprises a resistor-capacitor step-down circuit for converting an alternating current signal transmitted from an alternating current controller into a direct current signal, a filter capacitor capable of filtering and regulating the direct current signal, and a direct output of the direct current signal to the brushless DC motor. The optically coupled field effect relay or the optically coupled transistor of the speed control input pin; the DC power supply can convert the AC power to the DC power source, and has an input connected to the isolation control module, and at least one output connected to DC brushless motor, when the isolation control module outputs the corresponding DC signal to DC Brush motor and a DC power supply, DC power supply may supply power required for operation of the brushless DC motor. For example, the AC/DC power conversion control module of the central air conditioning system according to the first aspect of the patent application, wherein the isolation control modules are three groups, respectively coupled to the high, medium and low speed signals output by the AC controller, After conversion, the corresponding DC signal is output to the DC brushless motor and the DC power supply. The AC/DC power conversion control module of the central air conditioning system according to claim 1 or 2, wherein a resistance is set between the input end of the DC power supply and the isolation control module, so as to be resistant by the resistance The change identifies the different speed signals output by the isolation control module, so that the DC power supply can output the power required for the DC brushless motor to operate.