JP2011114432A - Remote control unit of water heater - Google Patents

Abstract

There is a problem that a remote control circuit microcomputer and peripheral parts are latched up due to a malfunction caused by a lightning surge or the like, and the remote control does not operate.
A remote control connected by two lines; a remote control connection terminal for connecting the remote control by two lines; a power supply means for supplying power to the remote control via the remote control connection terminal; A transmission / reception unit 5 that is interposed between the remote control connection terminal and the power supply unit and transmits a serial signal to the remote control; a period in which the transmission / reception unit cannot transmit / receive the predetermined time 1 and a period of the predetermined time 2 Power supply control means 7 for stopping is provided, the latch-up can be released during a power supply stop period of a predetermined time 2, and it can be automatically restored to normal after power supply is restored.

Description

  The present invention relates to a remote control device for a water heater connected by two wires.

  2. Description of the Related Art Conventionally, in a device such as a water heater, a remote control and a water heater main body are connected using two wires, and bidirectional data communication and power supply from the main body side to the remote control side are performed simultaneously. A control method is employed (see, for example, Patent Document 1).

  FIG. 3 is a block diagram showing a configuration example of a system to which a bidirectional two-wire remote control system that performs modulation / demodulation by high frequency is applied. In this figure, a main body 10 to be controlled is connected to terminals T1 and T2 and a remote controller 20. Are provided with terminals T3 and T4, each terminal being connected by two wires to the corresponding terminal T1 and terminal T3, and terminal T2 and terminal T4.

  The main body 10 includes a microcomputer 11 that controls data communication with the remote controller 20, a high-frequency modulation circuit 12 that modulates a pulse train output from the microcomputer 11 with a high frequency and outputs a high-frequency signal, and an output terminal and a terminal of the high-frequency modulation circuit 12. Capacitance 13 inserted between T1 and one end is connected to a power source having a voltage of 12V, and the other end is connected to a smoothing reactance 14 connected between terminal T1 and capacitance 13, and an input end of the high-frequency modulation circuit 12. A high frequency demodulating circuit 15 is provided which is connected between the output end and the capacitance 13 and demodulates a high frequency signal inputted from the input end with a high frequency and supplies the demodulated pulse train to the microcomputer 11. The terminal T2 is grounded in the main body 10.

  On the other hand, the remote controller 20 is provided with a microcomputer 21 that controls data communication with the main body 10 and performs display on the display panel of the remote controller, detection of the operation state of the switch group, and the like. In some cases, a high-frequency modulation circuit 22, a capacitance 23, and a high-frequency demodulation circuit 25 are provided in the same arrangement as the main body 10. However, a diode bridge 26 having two pairs of input / output terminals is inserted between the capacitance 23 and the terminal T3. The terminal T3 is connected to one input terminal of the diode bridge 26, and the capacitance 23 is connected to one output terminal. Is connected. A power supply circuit 27 that supplies electric power to the microcomputer 21 is connected to one output terminal of the diode bridge 26 via a reactance 24 for smoothing.

  With such a configuration, the circuit operation in bidirectional data communication will be described with reference to the waveform diagram of FIG. Regardless of the transmission to either the main body 10 or the remote controller 20, the power supply having a voltage of 12V is supplied via the reactance 14, the terminals T1 and 2 of the main body 10, the terminal T3 of the remote controller 20, the diode bridge 26, and the reactance 24. A signal is supplied to the power supply circuit 27.

  Transmission from the main body 10 to the remote control 20 When transmitting from the main body 10 to the remote control 20, first, in the main body 10, a transmission pulse train (see the upper side in FIG. 4) is supplied from the microcomputer 11 to the high frequency modulation circuit 12, and is modulated into a high frequency signal. The This high-frequency signal becomes an AC component of the power supply signal via the capacitance 13 (see the lower side in FIG. 4) and is transmitted to the remote controller 20. The AC component is extracted by the capacitance 23 of the remote controller 20 to become a high frequency signal, further demodulated by the high frequency demodulation circuit 25, and supplied to the microcomputer 21 as a received pulse train.

Transmission from the remote controller 20 to the main body 10 When transmitting from the remote controller 20 to the main body 10, first, in the remote controller 20, a transmission pulse train is supplied from the microcomputer 21 to the high frequency modulation circuit 22 and is modulated into a high frequency signal. This high-frequency signal becomes an AC component of the power supply signal via the capacitance 23 and is transmitted to the main body 10. The AC component is extracted by the capacitance 13 of the main body 10 to become a high frequency signal, further demodulated by the high frequency demodulation circuit 15, and supplied to the microcomputer 11 as a received pulse train.

JP-A-10-84590

  In recent years, damage from lightning has increased due to abnormal weather, etc., and malfunctions caused by lightning surges and the like cause latchup of microcomputers and peripheral parts of the remote control circuit, causing a problem that the remote control does not operate.

  An object of the present invention is to solve the above-described problems and to provide a remote controller control circuit for a water heater that can be automatically released even if a microcomputer or peripheral parts of the remote controller circuit are latched up.

  In order to achieve this object, the present invention provides a remote control connected by two lines, a remote control connection terminal for connecting the remote control by two lines, and a power supply for supplying power to the remote control via the remote control connection terminal Means, a transmission / reception means for transmitting a serial signal to the remote control between the remote control connection terminal and the power supply means, and a period in which the transmission / reception means cannot transmit / receive the predetermined time 1 after the predetermined time 1 The power supply control means for stopping the period is provided.

  The present invention can provide a remote controller control circuit for a water heater that can automatically return to normal even if a microcomputer or peripheral components of the remote controller circuit are latched up.

Circuit block diagram of remote controller for hot water supply apparatus in embodiment 1 Operation flowchart of remote controller for hot water supply apparatus in embodiment 1 Circuit block diagram of conventional remote control device Waveform diagram for explaining modulation / demodulation processing of a conventional remote control device

  According to a first aspect of the present invention, there is provided a remote control device for a water heater, a remote controller connected by two lines, a remote controller connection terminal for connecting the remote controller by two lines, and power supply for supplying power to the remote controller via the remote controller connection terminal. Means, a transmission / reception means interposed between the remote control connection terminal and the power supply means, for sending a serial signal to the remote control, and a period during which the transmission / reception means cannot transmit / receive the predetermined time 1 and the power supply means is stopped for a predetermined time 2 Even if a microcomputer or other circuit in the remote control is latched up, the power remaining on the remote control is stopped for a predetermined time 2 to discharge the remaining charge in the circuit such as the microcomputer. It is released and can be operated normally at the time of re-energization after the lapse of the predetermined time 2.

  The remote control device for a hot water heater according to the second aspect of the present invention comprises display means for displaying an abnormality when the remote controller cannot transmit / receive, and can notify the user when the transmission / reception is abnormal.

Since the remote controller for the hot water heater according to the third aspect of the invention is configured not to stop the power supply after the number of times of returning the power supply means reaches a predetermined number, the power supply is stopped when a circuit failure other than latch-up occurs. Since it is not performed, the remote control display is not repeatedly turned on / off, and an easy-to-understand abnormality display can be provided.

  In the remote control device for the hot water heater of the fourth invention, since the display means of the remote control is set longer than the time for displaying the abnormality, the power supply is stopped after the transmission / reception abnormality is displayed. Can be determined.

  In the remote control device for the hot water heater of the fifth aspect of the invention, the display means of the remote control is set to be shorter than the time for performing the abnormality display. Therefore, when the number of times the power supply means is restored due to transmission / reception abnormality is within a predetermined number of times, Is not displayed abnormally. Therefore, in the case of latch-up, there is no anxiety to the user because it returns to normal with no abnormality display at the time of re-energization. Further, if the circuit does not return to normal, such as when a circuit failure occurs, the power supply is not stopped after a predetermined number of times, so that the remote controller can notify the user when transmission / reception is abnormal.

(Embodiment 1)
FIG. 1 is a circuit block diagram of a remote control device for a water heater in the present embodiment.
Reference numeral 1 denotes a remote controller connected by two lines. Reference numeral 2 denotes a display means for displaying transmission / reception abnormality of the remote controller. 3 is a remote control connection terminal for connecting the remote control 1 with two wires, 4 is a power supply means for supplying power to the remote control 1, 5 is a transmission / reception means for bidirectional transmission and reception of serial signals with the remote control 1, and 6 is a power supply means 4 A DC power source for supplying power to the remote controller 1 via the power supply 7, a power supply control means 7 for receiving a signal from the transmission / reception means 5 and sending a power supply stop and power supply return signal to the power supply means 4, and the power supply means 4 is a power supply control means In response to the signal 7, power supply to the remote controller 1 is stopped and power supply is stopped. Moreover, the part shown with a dashed line in FIG. 1 shows a water heater main body.

  Next, the operation of the power supply control means 7 will be described. FIG. 2 is an operation flowchart of the remote controller for the hot water heater according to the embodiment of the present invention.

(Step 1) It is determined whether or not the power supply means 4 is ON. If it is ON, the process proceeds to Step 2;
(Step 2) The transmission / reception means 5 determines whether or not there is a transmission / reception abnormality.
(Step 3) Count up the abnormal time and proceed to Step 4.
(Step 4) It is determined whether or not the abnormal time exceeds a predetermined value. If the abnormal time exceeds the predetermined value, the process proceeds to Step 5;
(Step 5) It is determined whether the number of return times exceeds a predetermined value. If it exceeds the predetermined value, the process proceeds to Step 7, and if it is less than the predetermined value, the process proceeds to Step 6.
(Step 6) The power supply means 4 is stopped, and the process proceeds to Step 7.
(Step 7) The stop time is initialized, and the process returns to Step 1.
(Step 8) The abnormal time initialization and the return time initialization are performed, and the process proceeds to Step 7.
(Step 9) The stop time is counted up and the process proceeds to Step 10.
(Step 10) It is determined whether or not the stop time exceeds a predetermined value. If the stop time exceeds the predetermined value, the process proceeds to Step 11;
(Step 11) The power supply means 4 is set to the power supply side, the return count is incremented, and the abnormal time is initialized, and the process returns to Step 1.

When normal, the flow is step 1 → step 2 → step 8 → step 7, and the power supply means 4 is turned on. When the remote control microcomputer or the like latches up due to a malfunction such as a lightning surge, the transmission / reception means 5 causes a transmission / reception error, and the flow goes from step 1 → step 2 → step 3 → step 4 → step 7 and the transmission / reception abnormality time is counted up. If the transmission / reception abnormal time exceeds a predetermined value, the flow proceeds from step 1 to step 2 to step 3 to step 4 to step 5. In step 5, the number of return times is determined. The power is turned off and the process proceeds to step 7 where the power supply to the remote control is stopped.

  When the power supply means 4 is turned OFF, the process proceeds from step 1 to step 9 to step 10 and the stop time is counted and the process returns to step 1. If the stop time exceeds the predetermined value in step 10, the process proceeds to step 11 to turn on the power supply means 4, initializes the return count and initializes the abnormal time, returns to step 1, and starts power supply to the remote control again. Here, since the power supply has been stopped for a predetermined time on the remote control side, the electric charge is discharged and the latch-up of the microcomputer or the like is released. After that, since the transmission / reception means 5 can normally transmit / receive, the flow is normal.

  If the transmission / reception abnormality continues even after recovery due to a circuit failure or the like, the power supply means 4 is repeatedly turned off / on, and if the number of times of recovery exceeds a predetermined value, Step 1 → Step 2 → Step 3 → Step 4 → Step 5 → After the flow of step 7, the power supply means 4 continues to be turned on thereafter.

  As described above, in the case of latch-up or the like due to a temporary malfunction of the remote control circuit, the remote control power supply is automatically shut off, the power supply is restored again after a predetermined time, and the abnormality can be automatically canceled. Further, when the abnormality continues due to a failure of the remote control circuit or the like, it is possible to display and notify that the abnormality is present.

  If the predetermined value of the abnormal time in step 4 is shorter than the time until display when remote control transmission / reception is abnormal, power feeding is stopped before the remote control abnormal display, so that the user is not worried. Further, when the number of times of return is not limited, it can be understood that the power supply is stopped due to an abnormality by making the time longer than the display time at the time of remote control transmission / reception abnormality.

  As described above, the remote control device for a water heater according to the present invention can automatically return to normal even if the microcomputer or peripheral parts of the remote control circuit are latched up. It can be used for a remote control device to perform.

DESCRIPTION OF SYMBOLS 1 Remote control 2 Display means 3 Remote control connection terminal 4 Power supply means 5 Transmission / reception means 7 Power supply control means

Claims (5)

A remote control connected by two lines, a remote control connection terminal for connecting the remote control by two lines, power supply means for supplying power to the remote control via the remote control connection terminal, the remote control connection terminal and the power supply A transmission / reception means for transmitting a serial signal to the remote controller interposed between the means, and a power supply control means for stopping the power supply means for a predetermined time 2 when a period during which the transmission / reception means cannot transmit / receive has elapsed for a predetermined time 1 Remote control device for water heater. The remote controller for a hot water heater according to claim 1, wherein the remote controller includes display means for displaying an abnormality when transmission / reception cannot be performed. The remote controller for a hot water heater according to claim 1 or 2, wherein the power supply control means does not stop power supply after the number of times the power supply means has been restored reaches a predetermined number. The remote control device for a hot water heater according to claim 2 or 3, wherein the predetermined time 1 is set longer than a time during which the display means of the remote controller performs an abnormal display. The remote control device for a hot water heater according to claim 3, wherein the predetermined time 1 is set shorter than a time during which the display means of the remote controller performs an abnormal display.

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