JP2009207330A - Device and method for controlling relay for inrush current limiting circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for controlling a relay which connects current limiting elements in series to reduce an inrush current flowing through an electric path between a power switch and a power-supply rectifying device and which short-circuits the current limiting elements by a relay contact after the inrush current passes. <P>SOLUTION: In the standby state, a device for controlling an inrush current suppression circuit controls a first relay coil and a second relay coil, and turns off first and second relay contacts. When a load power supply is closed, the device for controlling the inrush current suppression circuit controls the first relay coil and the second relay coil, turns on the first relay contact first, and turns on the second relay contact after the inrush current passes. The device for controlling the relay for an inrush current limiting circuit not only reduces consumption power but also disables a current to flow through the relay coils because the current is not required to flow through the relay coils in the standby state. Consequently, the relay is not deteriorated, and the lifetime of relay itself can be lengthened. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, when an AC voltage is turned on or off by a power switch, a current limiting element is connected in series with the electric circuit in order to reduce an inrush current flowing through the electric circuit between the power switch and the power rectifying element. The present invention relates to a relay control device for an inrush current limiting circuit and a relay control method for an inrush current limiting circuit, which are connected and short-circuit the current limiting element by a relay contact after passage of the inrush current.

  The present invention also provides a relay coil for controlling the relay contact when used in a power storage device using an electrolytic capacitor in a power rectifier circuit or a hot water storage hot water supply device or a motor for a compressor, such as an air conditioner. The inrush current limit circuit relay control device and the inrush current limit can be turned off to reduce power consumption, suppress heat generation of the relay coil, save standby power, and improve the life of the relay coil The present invention relates to a circuit relay control method.

  FIG. 2 is a diagram for explaining a conventional example in a relay control device for an inrush current limiting circuit. In FIG. 2, the inrush current limiting circuit relay control device includes an AC power source 21, a power switch 22, a fuse 23, a current limiting element 24, and a relay contact 311 provided in parallel to the current limiting element 24. A power rectifier circuit including a bridge diode 25 and a smoothing electrolytic capacitor 26, a motor control circuit 27, a load control power supply circuit 28, a motor (load) 29 driven by the motor control circuit 27, and a load control circuit ( (Microcomputer) 30. The load control circuit 30 controls the motor control circuit 27 and also controls the relay coil 31 to turn the relay contact 311 on and off.

In the inrush current limiting circuit relay control device, for example, when the power switch 22 is turned on, an inrush current flows in the current limiting element 24. However, as the current increases, the resistance value of the current limiting element 24 increases rapidly. Therefore, the inrush current can be reduced. The inrush current limiting circuit relay control device causes the load control circuit 30 to cause a current to flow through the relay coil 31 after a predetermined time and to short-circuit the relay contact 311 connected in parallel to the current limiting element 24, Since the load current flows to the relay contact 311 side, power loss can be eliminated. The inrush current limiting circuit relay control device generates heat because current flows through the relay contact 311 and the relay coil 31. Such an inrush current limiting circuit relay control device is described in, for example, Japanese Patent Application Laid-Open No. 11-225432.
JP 11-225432 A

  However, the inrush current suppression circuit control device as described above continues to supply current to the relay coil 31 for connecting the relay contact 311 while the power switch 22 is turned on, regardless of the increase or decrease of the load current. Will be. The current that continues to flow through the relay coil 31 is accompanied by heat generation, and the copper wire coating or the like deteriorates due to aging, thereby shortening the life of the relay itself. Further, the relay contact 311 not only flows a relatively large current, but also deteriorates due to repeated ON-OFF, and the resistance increases. In order to prevent the deterioration of the relay, the reliability of the power supply device is maintained by using an expensive relay. In particular, hot water storage water heaters or air conditioners that use midnight power require long standby times and long product life depending on the mode of use, so highly reliable products are required, so expensive relays are used. It had been.

  In order to solve the above-described problems, the present invention achieves energy saving by preventing current from flowing through the relay coil in a standby state, like the hot water storage type hot water supply apparatus or the air conditioner, and also achieves the life of the relay. An object of the present invention is to provide a relay control device for an inrush current limiting circuit and a relay control method for an inrush current limiting circuit of a power device having a longer length.

(First invention)
The relay control device for an inrush current limiting circuit according to the first aspect of the invention controls the current in series with respect to the electric circuit between the power switch and the power supply rectifier circuit in order to suppress the inrush current generated when the AC voltage is turned on or off to the power equipment. After connecting an element and passing an inrush current, the current limiting element is short-circuited by a relay contact, and a load is generated by power from the control circuit power supply rectifier circuit for rectifying the AC voltage and power from the control circuit power supply rectifier circuit. A control circuit for controlling the power device being driven and on standby; a DC circuit including a first relay contact and a current limiting element provided after the power supply rectifier circuit for the control circuit; and the first contact and current A second relay contact provided in parallel with a DC circuit with the limiting element; and a smoothing electrolytic capacitor provided after the current limiting element and rectifying the AC voltage The load drive power supply rectifier circuit, the power device operated by the power supply of the load drive power supply rectifier circuit, and the control circuit turn off the first and second relay contacts during standby, It comprises at least a first relay coil and a second relay coil that turn on the first relay contact when turning on and turn on the second relay contact after passing the inrush current. .

(Second invention)
The relay control method for an inrush current limiting circuit according to the second aspect of the present invention limits the current in series with respect to the electric circuit between the power switch and the power supply rectifier circuit in order to suppress the inrush current that occurs when the AC voltage is turned on or off to the power equipment. A power supply rectifier circuit for a control circuit that controls elements during standby and during driving, and a power supply for load drive that drives electric power equipment. By providing a rectifier circuit separately, providing a parallel circuit of a current limiting element and a relay contact in front of the load drive power supply rectifier circuit, and controlling a relay contact provided in front of the load drive power supply rectifier circuit After turning on the load, the relay contact provided in front of the power supply rectifier circuit is turned ON, and the current is passed through the current limiting element, and then the power device without passing through the current limiting element And controlling so that power is supplied.

  According to the present invention, the load drive power supply rectifier circuit and the control circuit power supply rectifier circuit are separated separately and connected in series with the current limiting element by the load control power supply circuit driven by the control circuit power supply rectifier circuit during standby. Since the first relay contact and the second relay contact that short-circuits the current limiting element and the first relay contact are turned OFF, no current flows through the relay coil, so that energy saving and life of the relay are improved. I was able to.

  According to the present invention, in a power device that has a long standby time depending on the use mode and uses a large current, current is not passed through the relay during standby, so that not only energy saving can be achieved, but also the relay itself. The lifetime can be extended.

(First invention)
The relay control device for an inrush current limiting circuit according to the first aspect of the present invention is connected in series to an electric circuit between a power switch and a load driving power rectifier circuit in order to limit an inrush current generated when an AC voltage is applied to or cut off from an electric power device. A current limiting element is connected to the circuit, and after the inrush current has passed, the current limiting element is short-circuited by a relay contact. The control circuit power supply rectifier circuit is configured by, for example, a diode and a smoothing electrolytic capacitor provided to drive the control circuit.

  The control circuit controls the power device during load driving and standby by the power from the control circuit power supply rectifier circuit. A DC circuit with a first relay contact and a current limiting element is provided after the control circuit power supply rectifier circuit. The second relay contact is provided in parallel to the DC circuit with the first contact and the current limiting element. The load driving power supply rectifier circuit is provided after the current limiting element, and includes, for example, a bridge diode and a smoothing electrolytic capacitor in order to obtain electric power that can drive the main load of the power device. .

  The control circuit controls the first relay coil and the second relay coil to turn off the first and second relay contacts during standby. When the load power supply is turned on, the control circuit controls the first relay coil and the second relay coil to first turn on the first relay contact, and after passing the inrush current, Turn on the relay contact. The relay control device for the inrush current limiting circuit does not flow current to the relay coil during standby, so that not only power consumption can be reduced but also current does not flow to the relay coil, so that there is no deterioration of the relay. The life of the relay itself can be extended.

(Second invention)
The relay control method for an inrush current limiting circuit according to a second aspect of the present invention is configured in series with an electric circuit between a power switch and a load driving power supply rectifier circuit in order to limit an inrush current generated when an AC voltage is applied to or cut off from an electric power device. A current limiting element is connected to the circuit, and after the inrush current has passed, the current limiting element is short-circuited by a relay contact. A control circuit power supply rectifier circuit that performs control during standby and driving and a load drive power supply rectifier circuit that drives a load are provided separately. The current limiting element is provided in parallel with the relay contact in front of the load driving power supply rectifier circuit.

  The inrush current limiting circuit relay control method supplies power only to the control circuit during standby. When power is supplied to the load, power is supplied to the load from the load driving power supply rectifier circuit. When the load is applied, the relay contact provided in front of the power supply rectifier circuit is turned on, and after passing a current through the current limiting element, power is supplied to the load without passing through the current limiting element after passing an inrush current. As such, the relay contacts are controlled. In the inrush current limiting circuit relay control device, the power consumption during standby is only the control circuit, and no current flows through the relay coil. Therefore, energy saving and the life of the relay can be extended.

  FIG. 1 is a schematic diagram for explaining an inrush current limiting circuit relay control apparatus according to an embodiment of the present invention. In FIG. 1, the inrush current limiting circuit relay control device includes an AC power supply 11, a power switch 12, a fuse 13, a bridge diode 151, a power supply rectifier circuit for a control circuit including a diode 152 and an electrolytic capacitor 153, a current A first relay contact 202 connected in series with the limiting element 14, a second relay contact 204 connected in parallel with a series circuit of the current limiting element 14 and the first relay contact 202, and the AC power supply 11 A load driving power supply rectifier circuit comprising a smoothing electrolytic capacitor 16 that rectifies the voltage of the load, a load control circuit 17, a load control power supply circuit 18, a load control circuit 20, the first relay contact 202 and the second The first relay coil 201 and the second relay coil 203 are used to turn on and off the relay contact 204. That.

  In the inrush current limiting circuit relay control device, when the power switch 12 is turned on, the load control power circuit 18 and the load control circuit 20 are driven by the DC voltage smoothed by the bridge diode 151, the diode 152 and the electrolytic capacitor 153. To do. The load control circuit 20 causes a current to flow through the first relay coil 201 and turns on the first relay contact 202. The current flowing through the first relay contact 202 is limited by the current limiting element 14, smoothed by the smoothing electrolytic capacitor 16, and flows to the load control circuit 17.

  Thereafter, when the inrush current passes, the load control circuit 20 causes the second relay contact 204 to be turned ON by causing a current to flow through the second relay coil 203. The current that has passed through the second relay contact 204 is smoothed by the smoothing electrolytic capacitor 16 and supplied to the load control circuit 17 to drive the motor 19, for example. The load control power circuit 18 serves as a power source for the load control circuit 20 during standby, but also serves as a power source for the load control circuit 17 when the motor 19 is driven. The load control circuit 20 is controlled by the load control circuit 17 while the motor 19 is being driven.

  As described above, since no current flows through the first relay coil 201 and the second relay coil 203 by the load control circuit 20 during standby, not only is energy saving, but the life of each relay coil is extended. can do.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example. The present invention can be modified in various ways without departing from the scope of the claims. For example, the block in this embodiment can be achieved by known or well-known technical means. Moreover, the power supply in a present Example is applicable to a well-known or well-known electric power apparatus. Further, the current limiting element includes a PTC element or a thermistor whose resistance increases due to a sudden increase in current.

It is the schematic for demonstrating the relay control apparatus for inrush current limiting circuits which is an Example of this invention. Example 1 It is a figure for demonstrating the prior art example in the relay control apparatus for inrush current limiting circuits.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... AC power supply 12 ... Power switch 13 ... Fuse 14 ... Current limiting element 151 ... Bridge diode 152 ... Diode 153 ... Electrolytic capacitor 16 ... Smoothing electrolytic capacitor 17 ... Load control circuit 18 ... Load control power supply circuit 19 ... Motor 20 ... Load control circuit 201 ... First relay coil 202 ... First relay contact 203 ... First 2 relay coils 204... Second relay contact

Claims (2)

In order to suppress an inrush current generated when an AC voltage is applied to or cut off from an electric power device, a current limiting element is connected in series to the electric circuit between the power switch and the power supply rectifier circuit, and after passing the inrush current, the current limiting element In the inrush current limiting circuit relay control device that short-circuits the relay contact,
A power supply rectifier circuit for a control circuit that rectifies the AC voltage;
A control circuit for controlling the power device that is driving and waiting for load by power from the power rectifier circuit for the control circuit;
A DC circuit with a first relay contact and a current limiting element provided after the power rectifier circuit for the control circuit;
A second relay contact provided in parallel with a direct current circuit with the first contact and the current limiting element;
A power drive rectifier circuit for driving a load comprising a smoothing electrolytic capacitor provided after the current limiting element and rectifying the AC voltage;
The power device operated by the power source of the load driving power source rectifier circuit;
The control circuit turns off the first and second relay contacts during standby, turns on the first relay contact when the load power is turned on, and turns on the second relay contact after the inrush current has passed. A first relay coil and a second relay coil;
A relay control device for an inrush current limiting circuit, comprising: In order to suppress an inrush current generated when an AC voltage is applied to or cut off from an electric power device, a current limiting element is connected in series to the electric circuit between the power switch and the power supply rectifier circuit, and after passing the inrush current, the current limiting element In the inrush current limiting circuit relay control method for short-circuiting by the relay contact,
A control circuit power supply rectifier circuit that performs control during standby and driving, and a load drive power supply rectifier circuit that drives power equipment are provided separately.
A parallel circuit of a current limiting element and a relay contact is provided before the load driving power supply rectifier circuit,
By controlling the relay contact provided in front of the load driving power supply rectifier circuit, after turning on the load, the relay contact provided in front of the power supply rectifier circuit is turned on, and a current is passed through the current limiting element. And a relay control method for an inrush current limiting circuit, wherein control is performed so that power is supplied to a power device without passing through the current limiting element.

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