JP2007151254A - Power supply control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply control device high in usability that can restart the operation of a drive part of an electric product or the like when a voltage to be applied is returned to a normal state even if the voltage is erroneously applied to a power supply device of the electric product such as a heat pump hot-water feeding machine, in the work of the exchange or the like of a meter. <P>SOLUTION: The power supply control device comprises: a voltage conversion circuit 2 that converts an AC voltage to a DC voltage, a power supply measuring circuit 3 that measures the DC voltage after being converted by the voltage conversion circuit 2, and the drive part 8 that is driven by the DC voltage. The power supply control device is also characterized in that: when a DC voltage value measured by the power supply measuring circuit 3 differs from a rated voltage value of the drive part 8, the drive part 8 is stopped and the DC voltage value is continuously detected by the power supply measuring circuit 3, and when the DC voltage value is returned to the rated voltage value, the restart of the operation of the drive part 8 is continued. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply control device for protecting electrical appliances.

Conventionally, power supply control devices such as heat pump water heaters and air conditioners detect erroneous application of input AC voltage by measuring DC voltage (see, for example, Patent Document 1).
JP 2000-76993 A

  However, in construction such as meter replacement for all-electric construction that has been increasing in recent years, different voltages may be applied to products only during construction. In the above-mentioned conventional method, when erroneous application is detected, it is assumed that the product is abnormally installed, and the product is completely stopped, or normal operation is performed with erroneous application, and normal operation is performed. It may become impossible.

  The present invention solves the above-mentioned conventional problems, and when applied to a power supply device of an electrical appliance such as a heat pump water heater during construction such as meter replacement, when the applied voltage returns to normal, It is an object of the present invention to provide a highly usable power supply control device capable of resuming the operation of a drive unit such as an electric appliance.

  In order to solve the conventional problem, the power supply control device of the present invention includes a voltage conversion circuit that converts an AC voltage into a DC voltage, a power supply measurement circuit that measures a DC voltage after being converted by the voltage conversion circuit, A drive unit driven by the DC voltage, and when the DC voltage value measured by the power supply measurement circuit is different from the rated voltage value of the drive unit, the drive unit is stopped and the power supply measurement circuit The detection of the DC voltage value is continued, and when the DC voltage value returns to the rated voltage value, the operation of the drive unit is resumed.

  As a result, even if a power supply voltage is erroneously applied, the power supply control device does not stop. can do.

  Even if a voltage is mistakenly applied to a power supply controller for an electrical appliance such as a heat pump water heater during construction work such as a meter replacement, the operation of the drive unit such as the electrical appliance may be resumed when the applied voltage returns to normal. A power supply control device with high usability can be provided.

A first invention includes a voltage conversion circuit that converts an AC voltage into a DC voltage, a power supply measurement circuit that measures a DC voltage after conversion by the voltage conversion circuit, and a drive unit that is driven by the DC voltage, When the DC voltage value measured by the power supply measurement circuit is different from the rated voltage value of the drive unit, the drive unit is stopped and the DC voltage value is continuously detected by the power supply measurement circuit. When the DC voltage value returns to the rated voltage value, the operation of the drive unit is resumed, so that the power supply control device is applied without stopping even if an erroneous application of the power supply voltage occurs. Measurement of the power supply voltage is continuously performed, and when the applied power supply voltage value becomes the power supply voltage value at which the drive section normally operates, the operation of the drive section can be resumed. The normal operation of the part becomes impossible It can be a prevented, also in spite of the erroneous application of a supply voltage, to prevent a situation that stopped while the product to be installed abnormality recognized.

  The second invention is provided with an operation status display unit for guiding the operation status, particularly in the first invention, and is applied when the DC voltage value is different from the rated voltage value of the drive unit for a predetermined time. By displaying an abnormal guidance that indicates that the AC voltage value is abnormal on the operation status display unit, the current state of the driving unit can be indicated to the user, and the DC current is maintained for a predetermined time. Since it does not return to the normal value, the user can confirm that the drive unit is stopped due to an abnormality caused by installation.

  According to a third aspect of the present invention, in particular, in the second aspect, when the DC voltage value returns to the rated voltage value after a predetermined time elapses and the operation of the drive unit resumes, the abnormality guidance display is turned off. Thus, even after a predetermined time has elapsed, when the operation of the drive unit resumes and returns to normal operation, it is determined that the drive unit is operating normally, so the user can operate the drive unit normally. Can be confirmed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a control circuit block diagram of a power supply control device according to the first embodiment of the present invention. In the present embodiment, the drive unit is shown by taking the drive unit of the heat pump water heater as an example, but the power supply control device of the present invention is not limited to the power control device of the heat pump water heater, and is an air conditioner or other power source. It is applicable also to the apparatus which has this.

  In FIG. 1, a power supply control device 1 includes a voltage conversion circuit 2 that converts a power supply voltage from AC to DC, a power supply measurement circuit 3 that measures an input voltage, and a relay switch 5 that is a protection circuit that cuts off the circuit current. The driving unit 8 is supplied with power to the heat pump water heater, and the power control unit 10 performs calculations in the power control device 1. In the present embodiment, the power supply control unit 10 is constituted by a microcomputer. In addition, when the voltage value measured by the power supply measuring circuit 3 is abnormal, an operating state display unit 7 for displaying to the user that the voltage value is abnormal and an AC power source 6 for supplying power to the drive unit 8 are provided. Yes.

  About the power supply control apparatus of the heat pump water heater configured as described above, its operation and action will be described below.

  FIG. 2 is a control chart in the present embodiment. Hereinafter, the control in the present embodiment will be described with reference to FIG.

  First, when the operation of the heat pump water heater is started, the voltage of the AC power supply 6 is converted into a DC voltage by the voltage conversion circuit 2, the value of the converted DC voltage is measured by the power supply measurement circuit 3, and the drive unit 8 is turned on. Power is supplied. At this time, using the value measured by the power supply measuring circuit 3, the value of the AC power supply 6 input by the microcomputer as the power supply control unit 10 is calculated. If the value of the AC power source 6 is an applied voltage value equal to or lower than a predetermined target value (voltage threshold shown in FIG. 2), that is, a voltage value outside the range in which the drive unit 8 normally operates, the power source control unit 10 It judges that it is abnormal and stops the driving | operation of the drive part 8 of a heat pump water heater. At this time, the relay switch 5 remains closed.

Next, when the time during which it is determined that the applied voltage is abnormal passes for a predetermined time, the operation status display unit 7 provides guidance indicating that it is abnormal. However, when the applied voltage returns to a voltage within the normal range, the operation of the heat pump water heater is started and the guidance shown in the operation status display unit 7 is turned off.

  In addition, after a predetermined time has elapsed after measuring an abnormal voltage value, the operation status display unit 7 is informed of the abnormality, and then the relay switch 5 that is a protection circuit is opened to stop the voltage measurement. Control may be performed. By performing such control, the time during which the voltage is continuously measured is limited to a predetermined time, so that power consumption can be reduced compared to a configuration in which the voltage is constantly measured. .

  In the present embodiment, after starting the operation of the heat pump water heater, the control of detecting that the applied voltage is abnormal and stopping the operation of the heat pump water heater has been described in detail. As shown, the voltage may always be measured without operating the heat pump water heater. 3 and 4 are control chart diagrams in another embodiment. In FIGS. 3 and 4, since the voltage can always be measured, the control of starting the operation of the heat pump water heater is performed as soon as the voltage value returns to the normal value. In FIG. 3, an abnormal voltage is detected. After a predetermined time has elapsed, the abnormality guidance is displayed on the driving condition display unit 7 whereas in FIG. 4, the abnormality guidance is displayed on the driving condition display unit 7 immediately after the voltage abnormality is detected. it's shown. By performing such control, the user can recognize that the applied voltage is abnormal before starting the operation of the heat pump water heater. It is possible to prevent the start of the operation, and it is possible to reduce the failure factor of the heat pump water heater due to the erroneously applied voltage. In particular, in the embodiment shown in FIG. 4, the abnormality guidance is displayed immediately after the abnormality detection, so that the abnormality is promptly guided to the user and the operation of the heat pump water heater is started under the abnormal voltage. It is preventing.

  As described above, in the present embodiment, a voltage conversion circuit that converts AC voltage to DC voltage, a power supply measurement circuit that measures the DC voltage after conversion by the voltage conversion circuit, and the DC voltage drive. A drive unit, and when the DC voltage value measured by the power supply measurement circuit is different from the rated voltage value of the drive unit, the drive unit is stopped and the DC voltage value is detected by the power supply measurement circuit. When the DC voltage value returns to the rated voltage value, the power supply control device is stopped even if an erroneous application of the power supply voltage occurs by restarting the operation of the drive unit. Measurement of the applied power supply voltage is continuously performed, and when the applied power supply voltage value becomes a power supply voltage value at which the drive section normally operates, the operation of the drive section is resumed. Because of the drive part To prevent a state in which normal that operation becomes impossible, and in spite of the erroneous application of a power supply voltage, it is possible to prevent a situation that stops to be placed abnormal while the product is recognized.

  As described above, the power supply control device according to the present invention does not stop the power supply device even when the power supply voltage is improperly applied, and resumes the operation of the drive unit when the voltage returns to the normal applied voltage. Therefore, it can be applied not only to heat pump water heaters but also to applications such as air conditioners and electric water heaters.

Control circuit block diagram of power supply control device in Embodiment 1 of the present invention Control chart in the same embodiment Control chart in other embodiments Control chart in other embodiments

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply control apparatus 2 Voltage conversion circuit 3 Power supply measurement circuit 5 Relay switch 6 AC power supply 7 Operation condition display part 8 Drive part 10 Power supply control part

Claims (3)

A voltage conversion circuit that converts AC voltage to DC voltage, a power supply measurement circuit that measures the DC voltage after conversion by the voltage conversion circuit, and a drive unit that is driven by the DC voltage, and that is measured by the power supply measurement circuit If the DC voltage value is different from the rated voltage value of the drive unit, the drive unit is stopped and the DC voltage value is continuously detected by a power supply measurement circuit. A power supply control device that resumes operation of the drive unit when the rated voltage value is restored. Provided with an operating status display unit for guiding the operating status, when the DC voltage value is different from the rated voltage value for a predetermined time, abnormal guidance for guiding that the applied AC voltage value is abnormal, The power supply control device according to claim 1, wherein the power supply control device is displayed on the operation status display unit. 3. The power supply control according to claim 2, wherein when the DC voltage value returns to the rated voltage value after a predetermined time elapses and the operation of the drive unit is resumed, the abnormality guidance display is turned off. apparatus.

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