KR20170043186A

KR20170043186A - Position control method for a heating valve actuator using AC voltage

Info

Publication number: KR20170043186A
Application number: KR1020150142584A
Authority: KR
Inventors: 김종현
Original assignee: 케이엔피솔루션(주)
Priority date: 2015-10-13
Filing date: 2015-10-13
Publication date: 2017-04-21

Abstract

The present invention relates to a method for controlling the position of a valve actuator for heating using an AC voltage, and more particularly, to a valve controller for heating safety valve for driving a safety voltage, which can control a unidirectional motor and a bidirectional motor by checking a minimum value and a maximum value of the valve The limit switch is turned on for a certain period of time after confirming the pressing of the limit switch in order to increase the life of the limit switch. As the limit switch is restored, Technology. In the conventional technology, one photocoupler or transformer is used for each driver channel, but only one photocoupler is used for the entire channel to receive the feedback signal. Therefore, the cost of the product is drastically reduced. And it has the effect that it can be used as desired by users regardless of bidirectional and unidirectional motors, proportional control method and on / off control method.

Description

[0001] The present invention relates to a position control method for a heating valve actuator using an AC voltage,

The present invention relates to a position control method of a valve actuator for heating, more particularly, to a position control method of a valve actuator for heating using an AC voltage configured to enable unidirectional motor control and bidirectional motor control by checking a minimum value and a maximum value of a valve .

Generally, a heating control system is installed in a general house, a public facility, an office or the like to adjust the temperature of the room to an appropriate temperature at all times. In the heating control system, For this purpose, a temperature controller for sensing the temperature of the room is provided.

The above-described heating control system makes a great contribution to energy saving by appropriately adjusting the internal temperature. However, in the current heating control system, particularly the valve control box does not have to receive the safety certification in particular, all the suppliers are deliberately ignoring electric safety due to the ignorance of electric safety or cost problems due to high cost.

Actually, the current is supplied to the valve control box by the valve driver, and the flow of 220 V is always applied to the valve. Therefore, there is always a risk of electric shock of the user due to the mistake or leakage of the user.

Prior art related to supplying power to the above-mentioned valve driver is disclosed in Korean Patent Laid-Open No. 10-2007-0063089, in which a dedicated communication line is not connected between a valve controller installed and an additional valve controller, A temperature control system using a power line communication modem for a valve controller which has an effect of controlling a temperature in the center or each room by providing a temperature control system using a communication modem is disclosed in Korean Patent Laid- 2008-0103358 discloses a control device and a control method of a thermostatic valve actuator which enables automatic opening and closing operation and intermediate position adjustment of a valve actuator mounted on a warm-water receiving valve used for heating.

However, in the above-mentioned prior arts, in order to secure the safety of the valve driver for AC 220V, it is necessary to replace the low voltage actuator frequently. In the case of the valve actuator, when the AC power is always supplied, And the position of the lowest point and the highest point is controlled. When the limit switch is always pressed, if it is used several thousands of times, it is likely to be broken and a problem occurs.

Therefore, when the limit switch is positioned on the feedback line for use only for position control and the position is confirmed and then the limit switch is passed to stop the motor, the limit switch is not always pressed and the durability can be extended. Since not only the minimum value but also the maximum value of the valve are checked, the control of the bidirectional motor as well as the control of the unidirectional motor are made possible.

The present invention aims to provide a position control method of a valve actuator for heating using an AC voltage. More specifically, the present invention relates to a position control method for a valve actuator for heating, The safety valve control circuit that supplies the power is improved to check not only the minimum value of the valve but also the maximum value so as to enable control of the bidirectional motor as well as control of the bidirectional motor and press the limit switch when the power is off And to provide a position control method for a heating valve driver using an AC voltage configured to permanently increase the service life of the limit switch.

As a solution to the position control method of the valve driver for heating using the AC voltage according to the present invention, there are a SMPS for receiving an AC power, a control unit for controlling the SMPS, a DC / AC converter for supplying a safety voltage under the control of the control unit, A feedback circuit for processing the feedback signal transmitted from the motor driver and the actuator, and a communication unit for communicating with the external device.

In the above SMPS, an AC down transformer or a DC / AC converter is used to supply power to the main body system and to use an AC driver for safety voltage. And a switch circuit for controlling the driver by using the down AC signal. And analyzes the feedback signal output from the driver to control the motor of the driver to a desired position.

The method for controlling the position of the valve driver for heating using the AC voltage according to the present invention is a method for controlling the position of the limit switch in order to increase the lifetime of the limit switch, and then, when the limit switch is released after the limit switch is released, Since the limit switch is not pressed, the lifetime is more than twice as long as the conventional technology. In the conventional technology, one photocoupler or a transformer is used for each driver channel. However, the present invention uses only one photo The coupler is used to receive the feedback signal. Therefore, the cost of the product is drastically reduced, and there is an advantage that the user can use the motor without any restriction on the bidirectional and unidirectional motors, the proportional control method and the on / off control method.

1 is a valve actuator control circuit using a conventional single-directional motor.
2 is a configuration diagram of a position control method of a valve driver for heating using an AC voltage according to the present invention.
3 is a circuit diagram of a position control method of a valve driver for heating using an AC voltage according to the present invention.
4 is a photocoupler output waveform when the limit switch is not pressed.
5 is a photocoupler output waveform when the peak limit switch is depressed.
6 is a photocoupler output waveform when the lowest limit switch is depressed.
7 is a diagram in which the limit switch and the knob of the driver cam are touched.
8 is a view for comparing a position control method of a valve driver for heating using an AC voltage according to the present invention and a conventional technique.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents of the present invention throughout the description.

1 is a valve driver control circuit using a conventional single-directional motor. Referring to FIG. 1,

AC power is applied only when the motor of the valve actuator is to be operated, and the control of the motor is performed by receiving the signal inputted through the limit switch. In addition, since the control signal is received and executed, it is possible to individually adjust it to match the set. And it can be used as desired by the user regardless of the proportional control method or the on / off control method.

However, in the case of the conventional circuit of Fig. 1, position control is possible for a unidirectional motor, and a considerable time is required for checking a starting point for a motor moving in both directions. Therefore, in order to solve this problem, a separate limit switch for checking the lowest point and the highest point is required. You should be able to check the low and high points with one feedback line.

Another conventional technique has a problem that the life of the pushed limit switch is shortened because the motor is stopped when the limit switch is depressed. When the limit switch is held in a pressed state and left for a long time, the spring of the terminal is not restored, resulting in a mechanical failure. This reduces the lifetime of the product to thousands of times, which is the main cause of the actuator failure.

FIG. 2 is a block diagram of a position control method of a valve actuator for heating using an AC voltage according to the present invention. Referring to FIG. 2,

A position control method of a valve driver for heating using an AC voltage according to the present invention is a method for controlling a position of a valve driver for heating, comprising: a SMPS receiving an AC power; a controller for controlling the SMPS; a DC / AC converter for supplying a safety voltage under control of the controller; A feedback circuit for processing the feedback signal, and a communication unit for communication with the external device.

It is preferable that the safety voltage is not more than AC 30V, but not limited thereto, a voltage of AC 30V or more is also possible.

FIG. 3 is a circuit diagram of a position control method of a heating valve driver using an AC voltage according to the present invention, FIG. 4 is a photocoupler output waveform when the limit switch is not pressed, 6 is a photocoupler output waveform when the lowest point limit switch is depressed and will be described in detail with reference to Figs. 3 to 6. Fig.

Based on the existing technology as shown in FIG. 1, a feedback signal is received by a limit switch, and AC power for driving the motor for a predetermined time is supplied to control the position of the motor. In the conventional technology, one limit switch is installed at the lowest point, and the peak is made to flow for a predetermined time, and then the motor is rotated. However, when the pressure of the valve is large, the motor rotates to a predetermined position It often happens that you can not stop. To improve this, a limit switch is added to the peak to measure the position.

However, in order to recognize two limit switches for recognizing the lowest point and the highest point as one feedback signal line, a circuit diagram is configured as shown in FIG. 3 do.

In order to correct the opening time according to the pressure of the valve for the first time, the driving method checks the time from the lowest point to the highest point, stores the above time data, and opens the valve for the opening time corresponding to the opening rate based on the stored time data.

The output waveform of the photocoupler when the limit switch is not pressed as shown in Fig. 4 is shown. The output waveform of the photocoupler when the peak limit switch is depressed as shown in FIG. 5 and the output waveform of the photocoupler when the low limit switch is depressed as shown in FIG. 6 is shown.

As shown in FIGS. 4 to 6, the lowest point and the highest point can be distinguished by the difference between when the limit switch is input and when there is no limit switch and when the limit switch is pressed by the diode.

Even when proportional control is performed using the bidirectional motor as described above, accurate time can be checked and the valve can be accurately controlled.

FIG. 7 is a drawing in which the limit switch and the knob of the actuator cam are touched. Referring to FIG. 7,

The limit switch and the knob of the driver cap are touched. In the case of (a), the cam knob is touched by the limit switch. In (b), the driver cam knob presses the limit switch correctly. (c), the driver cam knob has just been released from the state in which the driver cam knob has been pressed to the limit switch.

In the case of a general driver, the driver motor is stopped when the limit switch is depressed. If the driver motor is stopped in such a state that the limit switch is depressed, the spring of the limit switch is not restored, which is a main cause of mechanical failure of the driver .

Therefore, when the position control method of the heating valve driver using the AC voltage according to the present invention is used, the limit switch is used as a feedback signal so that the limit switch does not maintain the pressed state by the actuator cam knob as shown in (c) You can stop it.

FIG. 8 is a view for comparing a conventional technique and a position control method of a valve actuator for heating using an AC voltage according to the present invention. Referring to FIG. 8,

In the conventional technology, a photo coupler or a transformer circuit is used for each channel in order to transmit a feedback signal for each channel of a driver. However, in the position control method of the valve driver for heating using the AC voltage according to the present invention, the feedback signal is collected and transmitted as one, and an 'OR circuit' is formed in the two limit switches. Therefore, the photocoupler can be used only as shown in the drawing, thereby reducing the cost.

As described above, the motors are controlled one by one, and the feedback signals of the limit switches are sequentially received and controlled.

The present invention is not limited to the above-described embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

Among the methods of receiving the feedback using the limit switch in order to confirm the position of the driver of the system which uses the AC input power or uses the DC / AC converter or the down transformer to supply the driver power,
When the position of the driver is proportionally controlled, the position of the driver motor is controlled by sending AC power for a certain period of time from the time when the limit switch is received at the lowest point, And the peak position is input from each limit switch, the initial time while moving from the lowest point to the highest point is measured and stored as data, and the AC voltage which is calculated by calculating the ratio according to the opening ratio, A method for controlling the position of a heating valve actuator used.

The method according to claim 1,
The two limit switches are connected in series to each other when two limit switches receiving the position of the lowest point and the highest point are used at the same time, and a diode is connected in parallel to one or more limit switches of the two limit switches, And the signal line is used as one unit. The method of controlling position of a heating valve actuator using an AC voltage.

The method according to claim 1,
Wherein when the position of the driver is controlled, the limit switch is prevented from being damaged because the driver cam knob stops when the limit switch is not pressed by driving the motor for a predetermined time after stopping the input of the limit switch. A method for controlling the position of a heating valve actuator using a voltage.

The method according to claim 1,
A plurality of driver feedback signals are input to the OR circuit without constituting a photocoupler or a signal transform circuit as many as the number of driver feedback signals and the outputs of the OR circuits are controlled via a photocoupler or a signal transformer circuit, Wherein the feedback signal is received by driving one by one of the AC voltage.