JPH067385U - Remote control device - Google Patents

Abstract

(57) [Abstract] [Purpose] When a transmission error occurs between the main control unit and the terminal unit, normal operation is performed to prevent the microcomputer, memory, clock IC and other additional circuits on the terminal unit side from being reset. An object is to provide a remote control device that can return to a reset recovery state. [Structure] During normal operation, a first power supply voltage (Vcc1) is supplied from a power supply circuit 18 of the main control unit 10 to the terminal device 12, and when a transmission abnormality occurs between the two devices, a second voltage switching circuit 22 is used. It is switched to the power supply voltage (Vcc2) and supplied to the terminal device 12. At this time, since the second power supply voltage (Vcc2) is higher than the backup voltage (VDD) of the additional circuit 36 of the microcomputer, memory, clock IC, etc. on the terminal device 12 side, these additional circuits 36 and the like are not reset. The terminal device 12 is promptly reset and returned to the normal state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a remote controller, and more particularly to a remote controller suitable for controlling the operation of a water heater main body installed at a remote place such as a water heater by a remote command from a remote controller.

[0002]

[Prior art]

 Conventionally, for example, in a water heater and the like, it has already been performed to control combustion of a water heater main body installed outdoors or the like by remote operation by a remote controller far away.

A remote control device generally used in such a water heater as described above transmits and receives a signal between the main body of the water heater (main control device) and a remote controller (terminal device). Controls the combustion burner of the water heater main body, or controls the hot water temperature by the remote command signal.

In such a conventional remote control device, when a transmission abnormality such as transmission / reception occurs between the main control device and the terminal device, the power supply normally provided to the main control device is normally shut off for a certain period of time. The power supply of the terminal device was reset by.

[0005]

[Problems to be solved by the device]

 However, according to such a conventional remote control device, the supply of the power supply voltage to the terminal device is completely cut off. If the time is stored or the time is displayed on the liquid crystal display, these memories and clock functions are also reset. Then, there were problems such as the loss of data in memory and the need to reset the time display.

Further, in order to prevent the memory and the clock function from being reset, if a battery such as a backup battery is provided in an additional circuit such as a microcomputer, a memory, and a clock IC on the terminal device side, the manufacturing cost increases due to an increase in the number of parts. There was also the problem of inviting.

Further, in many cases, a smoothing capacitor, a bypass capacitor, or the like is incorporated in a power source unit such as a microcomputer, a memory, or a timepiece IC of a terminal device. In that case, the power source voltage rises or falls at the time of resetting or releasing the power source depending on the capacitor portion. It took a long time and the responsiveness of resetting the terminal device was poor.

The present invention was made in order to solve the above-mentioned problems, and its purpose is to provide a main function when a microcomputer of a terminal device runs out of control and cannot perform normal communication. By switching the power supply voltage supplied from the control device to the terminal device to a voltage different from the normal power supply voltage of the terminal device and to a voltage higher than the backup voltage of the microcomputer, memory, etc. provided in the terminal device, It is to provide a remote control device that resets the microcomputer. As a result, the memory of the terminal device and additional circuits such as a clock function are prevented from being reset, and the terminal device is smoothly reset and returned to normal operation.

[0009]

[Means for Solving the Problems]

 To achieve this object, a remote control device of the present invention comprises a main control device having a power supply means, a terminal device which operates by voltage supply from the main control device, and a voltage supply between the main control device and the terminal device. And a transmission line for transmitting and receiving, the power supply means resets the terminal device when the transmission error occurs and the first power supply voltage output function required for controlling the terminal device during normal operation. And a second power supply voltage output function required for the second power supply voltage, and the second power supply voltage has a voltage equal to or higher than a backup voltage of an additional circuit such as a microcomputer, a memory, and a clock IC installed in the terminal device. And a voltage switching control means for switching the power supply means from a first power supply voltage to a second power supply voltage when a transmission abnormality occurs between the main control device and the terminal device. The gist.

Further, the remote control device of the present invention further comprises reset delay means that does not reset the terminal device when the switching time from the first power supply voltage to the second power supply voltage is less than a predetermined time. To do.

[0011]

[Action]

 According to the remote control device of the present invention having the above configuration, the first power supply voltage is supplied to the terminal device from the power supply means of the main control device during normal operation. When an abnormality occurs in the signal transmission state between the two devices, the switching control means switches the power supply voltage supplied from the power supply means to the terminal device from the first power supply voltage to the second power supply voltage. As a result, the terminal device is reset, but since the second power supply voltage has a voltage necessary for backing up the microcomputer, memory, clock IC, etc. installed in the terminal device, these terminal device sides The various equipment of will not be reset.

According to the present invention as set forth in claim 2, the power supply voltage supplied from the power supply means of the main control device to the terminal device is inadvertently changed due to noise or the like, and the reset voltage is applied to the terminal device. Even if applied, the reset signal is not output to the microcomputer of the terminal device until the reset delay means elapses a predetermined time. Therefore, it is possible to avoid accidentally resetting the terminal device in such a case.

[0013]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an electrical control block diagram of a remote control device according to an embodiment of the present invention. As shown, the main controller 10 and the terminal device 12 are connected via a transmission line 14. It is also possible to connect to another terminal device via the transmission line 14.

The main controller 10 converts a commercial power supply 16 into a DC power supply and outputs a first power supply voltage (Vcc1) and a second power supply voltage (Vcc2), and a first power supply circuit 18 And a voltage switching circuit 22 for switching the second power supply voltage (Vcc1, Vcc2) by a switching signal from the microcomputer 20, a power supply superimposing circuit 24 for superimposing the power supply voltage supplied to the terminal device 12 and the transmission signal, and the terminal device. The transmission circuit 26 includes a transmission circuit 26 that transmits a transmission signal to the microcomputer 12 under the control of the microcomputer 20, a reception circuit 28 that receives the transmission signal from the terminal device 12, and transmits the transmission signal to the microcomputer 20.

On the other hand, the terminal device 12 separates a power supply voltage supplied from the main control device 10 and a transmission signal (although there is a signal transmitted from the main control device 10 to another terminal device), and the terminal device 12 side is separated. The power supply / signal separation circuit 30 that supplies the necessary power supply voltage to each circuit and the power supply voltage that is supplied to the terminal device 12 are applied through the time constant delay circuit formed by the resistor R and the capacitor C, and the detection voltage (VDET) Is input, the voltage detector 34 that outputs a reset signal (RESET) to the microcomputer 32 on the terminal device 12 side, and the power supply voltage supplied from the main controller 10 are built in this terminal device 12. A constant voltage circuit 38 for converting into a power supply voltage (V DD) required for an additional circuit 36 such as a micro computer 32, a memory, and a clock IC, a transmission signal to the main control device 10 and other terminal devices. B transmitting circuit 40 for transmitting the control of computer 32, and the main control unit 1 0 and the reception circuit 42 or the like for sending received to the microcomputer 32 a transmission signal from another terminal apparatus. The transmission line 14 is composed of a two-core cable.

Various voltages (Vcc1, Vcc2, VDET, VDD) in this remote control device are set as follows. That is, the first power supply voltage (Vcc1), which is the power supply voltage required for controlling the terminal device 12 during normal operation, has a relationship of Vcc1> VDD, and when the terminal device 12 is reset when an abnormality occurs, it is sent to the terminal device 12. The second power supply voltage (Vcc2), which is the power supply voltage to be supplied, has a relationship of Vcc2> VDD, Vcc1 ≠ Vcc2, and the detection voltage (voltage at which the voltage detector 34 resets the microcomputer 32 ( VDET) has a relationship of VDET = Vcc2. Further, the output voltage (VDD) of the constant voltage circuit 38, which is a power supply voltage required for the additional circuit 36 such as the microcomputer 32, the memory and the timepiece IC, is usually set to about 5V.

Next, the operation of the remote control device thus configured will be described. First, during normal operation, the first power supply voltage (Vcc1) is supplied from the main controller 10 to the terminal device 12. Therefore, the terminal device 12 operates by being regulated from the first power supply voltage (Vcc1) to the power supply voltage (VDD) of the microcomputer 32, the memory, the additional circuit 36 such as the timepiece IC by the constant voltage circuit 38. At this time, since the voltage detector 34 is turned off, the reset of the terminal device 12 is released.

On the other hand, when an abnormality occurs in the transmission signal due to a runaway of the microcomputer or the like and the main controller 10 determines that the terminal device 12 needs to be reset, the main controller 10 sends a switching signal to the voltage switching circuit 22. Is output and the supply voltage to the terminal device 12 is switched to the second power supply voltage (Vcc2). When the power supply voltage is switched to the second power supply voltage (Vcc 2), a time delay corresponding to a time constant occurs due to the resistor R and the capacitor C in the voltage detector 34 of the terminal device 12, and the voltage detector The second power supply voltage (Vcc2) is detected by 34, the voltage detector 34 is turned on and outputs a reset signal (RESET) to the microcomputer 32, and the microcomputer 32 of the terminal device 12 is reset.

After a lapse of a predetermined time, the main controller 10 switches the power supply voltage to the terminal device 12 from the second power supply voltage (Vcc2) to the first power supply voltage (Vcc1). Here, the "predetermined time" is set as follows. That is, [predetermined time] = [time constant for R and C] + [reset pulse width time required for reset of microcomputer]

Therefore, even if the power supply voltage is changed from the first power supply voltage to a voltage similar to the second power supply voltage (Vcc2) in a short time due to noise or the like, the delay circuit formed by the resistor R and the capacitor C The reset signal is not immediately sent to the microcomputer 32 of the terminal device 12, and therefore, the reset signal is not accidentally reset.

Thus, when the power supply voltage of the main control device 10 returns to the first power supply voltage (Vcc1), the voltage detector 34 of the terminal device 12 is turned off, the reset state of the microcomputer 32 is released, and normal operation is restored. To be done.

As described above, according to the remote control device of the above-described embodiment, when the abnormality of the transmission signal occurs between the main control device 10 and the terminal device 12, the terminal device 12 operates the microcomputer 32 and Since it is reset at a voltage (second power supply voltage V cc2) higher than the power supply voltage (VDD) of the additional circuit 36, the contents of the memory and the clock IC, etc., which compose the additional circuit 36 are retained without being reset. No data loss or time delay will occur.

Although not shown in the above-mentioned embodiment, the power source voltage (Vcc2) for resetting the terminal device 12 is not required even if the power source of the microcomputer or the like includes a smoothing capacitor or a bypass capacitor. Since the voltage is higher than the voltage (VDD) required for the microcomputer 32 and the additional circuit 36, the terminal device 12 is promptly reset without being affected by the time required for charging or discharging these capacitors.

Furthermore, the switching delay time from the first power supply voltage (Vcc1) to the second power supply voltage (Vcc2) is controlled by the reset delay control for the time constant of the resistor R and the capacitor C, which is caused by voltage fluctuations such as noise. False resetting does not occur and remote control with high noise resistance can be performed.

In the above embodiment, the commercial power supply 16 and the power supply circuit 18 are the power supply means in the claims of the present invention, the voltage switching circuit 22 and the microcomputer 20 are the voltage switching control means, the resistor R and the capacitor C. A delay circuit composed of and corresponds to the reset delay means, respectively. The invention is not limited to the above-described embodiments, and various modifications and improvements are included in the invention without departing from the spirit of the invention.

[0026]

[Effect of device]

 As is apparent from the above description, according to the remote control device of the present invention, when the transmission abnormality occurs between the main control device and the terminal device, the power supply voltage for reset supplied to the terminal device is changed. Since it is set higher than the reset voltage of the microcomputer, the memory, the additional circuit such as the timepiece IC, which are installed in the terminal device, the loss of the memory data and the time delay will not occur. Therefore, the trouble of resetting the memory data or resetting the time display does not occur, and it is not necessary to incorporate batteries for backup such as these microcomputers and memories, and the manufacturing cost can be reduced by reducing the number of parts. Can be made cheaper. Furthermore, not only is it possible to quickly reset the terminal device, but it is also possible to avoid erroneous resetting due to voltage fluctuations due to noise, etc., and remote control with high noise resistance becomes possible. Therefore, it is extremely useful to apply the remote control device of the present invention to devices that are controlled by remote control of a remote controller such as a water heater.

[Brief description of drawings]

FIG. 1 is an electrical control block diagram of a remote control device according to an embodiment of the present invention.

[Explanation of symbols]

 10 Main Controller 12 Terminal Device 14 Transmission Line 18 Power Supply Circuit 20 Microcomputer 22 Voltage Switching Circuit 32 Microcomputer 34 Voltage Detector 36 Additional Circuit 38 Constant Voltage Circuit

Claims (2)

[Scope of utility model registration request] 1. A main control device having a power supply means, a terminal device that operates by voltage supply from the main control device, and a transmission line that performs voltage supply and transmission / reception between the main control device and the terminal device. In the remote control device, the power supply means has a first power supply voltage output function required for controlling the terminal device during normal operation and a second power supply voltage output function required for resetting the terminal device during abnormal transmission. The second power supply voltage has a voltage equal to or higher than a backup voltage of an additional circuit such as a microcomputer, a memory, and a clock IC installed in the terminal device, and a transmission error occurs between the main control device and the terminal device. And a voltage switching control means for switching the power supply means from the first power supply voltage to the supply of the second power supply voltage when the above occurs. 2. The remote control device according to claim 1, further comprising reset delay means that does not output a reset signal to a microcomputer of the terminal device even when the terminal device detects a reset voltage for a predetermined time or less. .