JP2016135017A - Power supply control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply control system which reduces adverse influences upon a power supply device side by preventing an excessive excitation inrush current from being generated when starting power supply even in the case where an insulation transformer is disposed between a power supply device and a load in the house or the like.SOLUTION: The power supply control system comprises a power supply device 1 including an external power supply function and a load device 2 that becomes a power supply object, and supplies power from the power supply device 1 to the load device 2 via an insulation transformer 4. The power supply control system also comprises: a power supply side switching part 5 which is provided between the power supply device 1 and the insulation transformer 4 and switches a cable run; a load side switching part 6 which is provided between the insulation transformer 4 and the load device 2 and switches a cable run; and a control device 7 which closes the load side switching part 6 after closing of the power supply side switching part 5 is detected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply control system used to supply power to a load from a power supply apparatus having an external power supply function.

  A system for supplying power to a load on the house side at the time of a power failure from a power supply device having an external power supply function such as a storage battery or a fuel cell has been conventionally used, and an example thereof is described in Patent Document 1.

  When power is supplied to the house from a power supply device with such an external power supply function, insulation between the power supply device and the load is avoided so that noise and surge voltage generated on the power supply device side are not transmitted to the load side. It is preferable to arrange a transformer. However, at the moment when voltage is applied to the insulation transformer that has not been used until the start of power supply, a large inrush current flows to excite the transformer core, and the current value is several times the rated current of the insulation transformer. May reach.

  In the conventional system, the occurrence of an excessive magnetizing inrush current is prevented by turning on the switches in order from the power supply source (power supply device side). However, when used at home, this charging procedure is not always followed. For example, it is conceivable that the charging plug is inserted into the power feeding device with all the switches turned on. In this case, an excessive superimposition of the magnetizing inrush current and the inrush current of the load device flows to the power supply device side, causing a failure of the power supply circuit of the power supply device. In addition, in order to prevent this failure, power supply may be stopped.

JP 2014-7918 A

  The object of the present invention is to solve the above-mentioned conventional problems, and even when an insulating transformer is arranged between a power supply device having an external power supply function and a load such as a house, an excessive excitation inrush current at the start of power supply It is an object of the present invention to provide a power supply control system for the purpose of reducing an adverse effect on a power supply device side due to superimposition of an inrush current of a load device and preventing an unnecessary trip of a circuit breaker for wiring.

  The present invention made in order to solve the above-described problems is a power supply control that includes a power supply device having an external power supply function and a load device to be supplied with power, and supplies power from the power supply device to the load device via an insulating transformer. A power supply side opening / closing unit that opens and closes an electric circuit provided between a power supply device and an insulating transformer, a load side opening / closing unit that is provided between an insulating transformer and a load device, and that opens and closes a power supply side And a control device for closing the load side opening / closing part after detecting the closing of the part.

  In a preferred embodiment, the control device performs control to close the power supply side opening / closing part when a voltage on the primary side of the power supply side opening / closing part is detected. The control device performs control to close the power supply side opening / closing part after opening the load side opening / closing part or after confirming the opening of the load side opening / closing part. The power supply side switching unit or the load side switching unit includes a switch that opens and closes an electric circuit and a circuit breaker that cuts off a circuit when an overcurrent or leakage is detected, and the control device performs an opening and closing operation of the switch Take control.

  If the power supply control system of the present invention is used, the control device sequentially opens and closes the power supply side opening and closing unit and the load side opening and closing unit, so that an excessive excitation inrush current and a load device inrush current are superimposed and flow to the power supply device side. It can be prevented and power can be supplied safely. For this reason, it is not necessary to limit a user's operation method.

  If control is performed to close the power supply side opening / closing section when the primary side voltage of the power supply side opening / closing section is detected, the user does not need to consider the connection procedure, and the user need only operate the power supply apparatus.

  If the control device performs control to close the power supply side opening / closing part after opening the load side opening / closing part or after confirming the opening of the load side opening / closing part, the safety of the power supply system is improved. Can do.

  The power supply side switch or load side switch is composed of a switch that opens and closes the circuit, and a circuit breaker that shuts off the circuit when an overcurrent or leakage is detected. If control is performed, the frequently performed switching operation is performed by the switch, and the circuit breaker for wiring can be operated at the time of short circuit or electric leakage. In particular, the electromagnetic contactor / relay is a mechanism that opens and closes an electric circuit with an electromagnet, so that it is less worn and has the advantage that no failure occurs even if the opening and closing operation is repeated.

It is circuit explanatory drawing which shows embodiment of this invention. It is explanatory drawing of the operation | movement step of this invention. It is explanatory drawing of the operation | movement step of this invention. It is explanatory drawing of the operation | movement step of this invention. It is a front view which shows the housing | casing of other embodiment.

Embodiments of the present invention will be described below.
FIG. 1 is an explanatory diagram of a circuit showing an embodiment of the present invention, in which 1 is a power supply device having an external power supply function, 2 is a load device to be supplied with power, and 3 is a casing in which control equipment is housed.

  Examples of the power supply device 1 having an external power supply function include a fuel cell, a solar cell, a storage battery charged by a commercial power source, and the like. In the present embodiment, the power feeding device 1 is a storage battery. The load device 2 can exemplify a load that is desired to continue its operation even in the event of a power failure, such as a residential emergency light or a refrigerator.

  An insulating transformer 4, a power supply side opening / closing part 5, a load side opening / closing part 6, and a control device 7 are housed inside the housing 3. The insulating transformer 4 is a device that is installed between the power supply device 1 and the load device 2 and has a function of preventing the generated noise and surge voltage from being transmitted to the other.

  The power supply side opening / closing part 5 is disposed between the power supply device 1 and the insulation transformer 4, and is a circuit breaker for interrupting the circuit when an overcurrent or a leakage is detected, and a switch 8 such as an electromagnetic contactor or a relay. It consists of a container 9. The load-side switch 6 is disposed between the insulating transformer 4 and the load device 2, and a switch 10 such as an electromagnetic contactor or a relay, and a wiring breaker that cuts off the circuit when an overcurrent or leakage is detected. The container 11 is comprised. However, the switch and the circuit breaker are not necessarily required, and either one can be used. The control device 7 is a device that performs opening / closing control of the power supply side opening / closing section 5 and the load side opening / closing section 6, and details thereof will be described later.

  As shown in FIG. 1, in this embodiment, the housing 3 houses an insulating transformer 4, a power supply side opening / closing part 5, a load side opening / closing part 6, a control device 7, and the like. It is also possible to store the winding portion 13 of the cable 12 and make a space for storing the extra length of the cable 12. However, the power supply side opening / closing part 5 and the load side opening / closing part 6 may be provided outside the housing 3, or only one of the opening / closing parts may be disposed in the housing 3.

  As described above, when power supply from the power supply apparatus 1 to the load apparatus 2 is started in a state where the insulating transformer 4 is not used and the power supply side opening / closing section 5 and the load side opening / closing section 6 are closed, excessive excitation is caused. There is a problem that the inrush current and the inrush current of the load device 2 are superimposed to cause a failure of the power supply circuit of the power feeding device 1. In order to avoid this, in the present invention, the control device 7 performs control to close the load side opening / closing part 6 after detecting the closing of the power supply side opening / closing part 5. That is, first, only the power supply side opening / closing part 5 is closed to excite the insulation transformer 4. After that, the load side opening / closing part 6 is closed to start power supply to the load device 2. In this manner, since the control device 7 sequentially opens and closes the power supply side opening / closing unit 5 and the load side opening / closing unit 6, it is possible to prevent an excessive excitation inrush current and an inrush current of the load device 2 from being superimposed. Prevent adverse effects. Since the control device 7 performs opening / closing control of the power supply side opening / closing part 5 and the load side opening / closing part 6, there is no need to limit the user's operation method.

Detailed operation steps are as follows.
(1) The user pulls out the cable 12 from the housing 3 and connects the plug 14 at the end of the cable to the power supply apparatus 1.
(2) The control device 7 detects the voltage on the primary side of the power supply side opening / closing part 5 and confirms the connection to the power supply device 1. (Figure 2)
(3) After detecting the voltage on the primary side, only the power supply side opening / closing part 5 is closed.
(4) The insulating transformer 4 is excited. (Figure 3)
(5) After detecting the decay of the magnetizing inrush current, the control device 7 closes the load side opening / closing part 6.
(6) Power supply to the load device 2 is started. (Fig. 4)
(7) After the end of power supply, the load side opening / closing part 6 is opened, the power supply side opening / closing part 5 is opened, and the power supply is terminated.

  In the step (2), the voltage on the primary side of the power supply side switching unit 5 is detected by the primary side operation detection unit of the control device 7 or the voltage of the primary side terminal of the circuit breaker 9 or the plug 14. What is necessary is just to detect a voltage.

  The closing of the power supply side opening / closing part 5 in (3) is detected by the secondary side motion detection part of the control device 7 or the load side opening / closing part 6 is opened. It is desirable to increase the safety of the power feeding system. Alternatively, when the power supply side opening / closing part 5 is opened, the control device 7 may control the load side opening / closing part 6 to open. In some cases, the power supply side opening / closing unit 5 is always closed. In this case, the plug 14 is connected to the power supply device 1 or the ON operation of the power supply device 1 is the start of excitation of the insulation transformer 4. When the power supply side opening / closing part 5 is always closed, the control device 7 opens the load side opening / closing part 6 when the power supply apparatus 1 is not operating or when the voltage of the power supply side opening / closing part 5 is not detected. Control to keep.

  After the voltage of the insulation transformer 4 is established in (4), the control device 7 closes the load side opening / closing part 6 in (5). However, since the exciting current of the insulation transformer 4 is attenuated in several hundred milliseconds, control is performed. The device 7 can also perform control to close the load side opening / closing part 6 after a predetermined time has elapsed after closing the power supply side opening / closing part 5.

  In this embodiment, the load side switch 6 is composed of the switch 10 and the wiring breaker 11, but as shown in FIG. 5, only the wiring breaker 11 can be used. However, as described above, since the load-side switching unit 6 performs the switching operation many times, it is preferable to incorporate the switch 10 serving as an electromagnetic contactor / relay having an excellent circuit switching operation. In particular, when a mechanism that opens and closes an electric circuit by attracting an electromagnet is used as an electromagnetic contactor / relay, there is an advantage that mechanical wear is less than a structure that mechanically opens and closes an electric circuit like the circuit breaker 11 for wiring. However, since the magnetic contactor / relay does not have a protection function such as a short-circuit current, it is preferable to connect a circuit breaker 11 for detecting a leakage or overcurrent to cut off the electric circuit and take measures against a short-circuit accident. This circuit breaker 11 should always be closed.

  The power supply side switch 5 may be the wiring breaker 9 alone, but it is preferable that the switch 8 and the wiring breaker 9 are combined in the same manner as the load switch 6. The circuit breaker 9 for the load-side switching unit 6 can protect the power feeding device 1 when a short-circuit current or a leakage occurs for some reason.

  As described above, according to the present invention, it is possible to reduce the adverse effects on the power feeding device side due to the excessive magnetizing inrush current and the inrush current of the load device 2 at the start of power feeding.

DESCRIPTION OF SYMBOLS 1 Power supply apparatus 2 Load apparatus 3 Housing | casing 4 Insulation transformer 5 Power supply side switch part 6 Load side switch part 7 Control apparatus 8 Switch 9 Circuit breaker 10 Switch 11 Switch circuit breaker 12 Cable 13 Winding part 14 Plug

Claims (4)

A power supply control system including a power supply device having an external power supply function and a load device to be supplied with power, and supplying power from the power supply device to the load device via an insulation transformer,
A power supply side opening / closing part provided between the power supply device and the insulation transformer for opening and closing the electric circuit, a load side opening / closing part provided between the insulation transformer and the load device for opening and closing the electric circuit, and a closing of the power supply side opening / closing part are detected. And a control device that closes the load side opening / closing section after the operation.   The power supply control according to claim 1, wherein the control device performs control to close the load side opening / closing part and the power supply side opening / closing part when a voltage on a primary side of the power supply side opening / closing part is detected. system.   2. The control device according to claim 1, wherein the control device performs control for closing the power supply side opening / closing part after opening the load side opening / closing part or after confirming the opening of the load side opening / closing part. The power supply control system according to claim 2.   The power supply side switching unit or the load side switching unit includes a switch that opens and closes an electric circuit and a circuit breaker that cuts off a circuit when an overcurrent or leakage is detected, and the control device performs an opening and closing operation of the switch The power supply control system according to claim 1, wherein the power supply control system performs control.

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