JP6004997B2 - Power supply - Google Patents

Description

  The present invention relates to a power supply apparatus.

  A power conditioner for photovoltaic power generation installed in a general household or a power conversion device that converts commercial AC power into DC power and supplies it to an electric vehicle (hereinafter referred to as “EV”) includes a switching element. A load control unit that controls the load device such as an operation / display panel that receives an indication of power supply and a user operation and a gun stand for EV charging, and supplies to the load control unit and the load device. A control power generation unit that generates a direct current power supply. The switching elements that constitute the inverter and the converter are sources of high-frequency noise called switching noise during switching. Since this switching noise causes malfunctions such as runaway of a microcomputer constituting the load control unit and transmission of an abnormal signal, for example, a power supply board mounted with a power conversion unit such as an inverter or a converter, a control power generation unit, etc. It can be considered that the load control unit is divided into a control board and the power supply board and the control board are separated from each other by a mounting distance. In addition, as a technique for preventing malfunction of other electronic devices due to unnecessary electromagnetic waves generated from the electronic device, for example, the neutral side of the ground potential in the single-phase power source of the commercial power source and the hot side of the live part are automatically distinguished. By connecting the neutral side of the single-phase power supply and the ground side of the electronic device, there is a device that effectively suppresses unnecessary electromagnetic interference without requiring a new ground wire or the like (for example, Patent Documents). 1).

JP 2002-262455 A

  When installing a power conditioner or power converter, load devices such as operation / display panels and EV charging gun stands are installed at various locations in the house that are separate from the power conditioner and power converter. . For power supply from the power supply board to each load device when the power supply board mounting the power conversion unit such as an inverter and converter, the control power generation unit, etc. and the control board mounting the load control unit are set apart from each other The signal line connection harness from the control board to each load device is connected to the load device, but at this time, via the power supply harness and the signal line connection harness, There is a problem that a large ground loop is formed, current flows due to a potential difference generated in the ground loop, and so-called ground loop noise may occur.

  The present invention has been made in view of the above, and a load control unit that transmits a control signal to a load device and a control power generation unit that supplies DC power to the load device and the load control unit are installed separately. It is an object of the present invention to provide a power supply apparatus that can prevent the occurrence of ground loop noise without forming a ground loop.

  In order to solve the above-described problems and achieve the object, a power supply device according to the present invention is a power supply device that converts DC or AC power supplied from an external power source into DC power and supplies the DC power to a load device. A load control unit that controls the load device, one first DC power source that supplies power to the load control unit using the external power source, and one or more second DC sources that supply the load device A control power generation unit that generates a power source, wherein the control power generation unit generates a first DC power source circuit that generates the first DC power source and a second DC source that generates the second DC power source. Operated by a power supply circuit, normally open switching means provided between the output reference potential point of the first DC power supply circuit and the output reference potential point of the second DC power supply circuit, and the external power supply After starting up the external power supply Then, it is determined whether the output reference potential point of the first DC power supply circuit and the output reference potential point of the second DC power supply circuit are conductive. And an energization control unit that performs the closing control.

  According to the present invention, a ground loop is formed even in a configuration in which a load control unit that transmits a control signal to a load device and a control power generation unit that supplies DC power to the load device and the load control unit are installed apart from each other. Thus, there is an effect that the generation of the ground loop noise can be prevented in advance.

FIG. 1 is a diagram illustrating a configuration example of the power supply apparatus according to the embodiment. FIG. 2 is a diagram illustrating a specific operation example of the power supply device according to the embodiment. FIG. 3 is an example of a control flowchart of the power supply apparatus according to the embodiment.

  Hereinafter, a power supply apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

Embodiment.
FIG. 1 is a diagram illustrating a configuration example of the power supply apparatus according to the embodiment. The power supply apparatus 100 according to the embodiment includes a control power generation unit 1 configured on a power supply board (not shown) and a load control unit 2 configured on a control board (not shown). For example, it is assumed to be installed in a power conditioner for solar power generation or a power conversion device that converts commercial AC power into DC power and supplies it to the EV.

  In the present embodiment, it is assumed that a large power conversion unit such as an inverter or a converter constituting a power conditioner or a power conversion device is mounted on the power supply board in addition to the control power generation unit 1. In order to prevent malfunction such as runaway of the microcomputer 6 constituting the load control unit 2 or transmission of an abnormal signal due to high frequency noise such as switching noise generated from the switching elements constituting the inverter or converter, The control board is installed at a mounting distance away from the power supply board, and the control power supply generation unit 1 and the load control unit 2 are connected via a harness 10 as shown in FIG.

  Moreover, in this Embodiment, as each load 7a, 7b, 7c which comprises each load apparatus 3a, 3b, 3c, the circuit load which comprises the power supply system centering on a power conditioner and a power converter device, for example, An operation / display panel for receiving a power supply amount and a user operation, a gun stand for EV charging, or an LED device associated therewith are assumed. In the example shown in FIG. 1, each load device 3a, 3b is assumed. 3c and the control power generation unit 1 are connected via power supply harnesses 11a, 11b and 11c, respectively, and signal lines are connected between the load devices 3a, 3b and 3c and the load control unit 2, respectively. It shows an example of being connected via the harnesses 12a, 12b, 12c. Note that the load devices 3a, 3b, and 3c are determined as to whether or not the load devices 3a, 3b, and 3c are necessary, and the configuration differs depending on the environment in which the power conditioner and the power converter are installed. For example, in an environment where the EV is not possessed or is not planned to be possessed, the EV charging gun stand is not required.

  The control power supply generation unit 1 generates a first DC power supply circuit 4 that generates the first DC power supply Vcc-M supplied to the load control unit 2 and a second DC power supply Vcc-A that supplies the load device 3a. Second DC power supply circuit 5a, second DC power supply circuit 5b for generating second DC power supply Vcc-B to be supplied to load device 3b, and second DC power supply Vcc-C to be supplied to load device 3c are generated. The normally open circuit between the output reference potential point GND-M of the second DC power supply circuit 5c and the first DC power supply circuit 4 and the output reference potential point GND-A of the second DC power supply circuit 5a. The opening / closing means 8a, the energization control section 9a for controlling the opening / closing means 8a and the second DC power supply circuit 5a, the output reference potential point GND-M of the first DC power supply circuit 4, and the output of the second DC power supply circuit 5b Provided between reference potential point GND-B The normally open switching means 8b, the energization control section 9b for controlling the switching means 8b and the second DC power supply circuit 5b, the output reference potential point GND-M of the first DC power supply circuit 4 and the second DC A normally open switching means 8c provided between the output reference potential point GND-C of the power supply circuit 5c and an energization control section 9c for controlling the switching means 8c and the second DC power supply circuit 5c are provided. .

  The energization control unit 9a, the energization control unit 9b, and the energization control unit 9c are operated by an external power source Vd that is a DC or AC power supply source input from the outside, and the first DC power circuit 4 and the second DC The power supply circuit 5a, the second DC power supply circuit 5b, and the second DC power supply circuit 5c use the external power supply Vd to supply the load control unit 2, the load device 3a, the load device 3b, and the load device 3c, respectively. A first DC power supply Vcc-M, a second DC power supply Vcc-A, a second DC power supply Vcc-B, and a second DC power supply Vcc-C are generated. The external power source Vd may be, for example, a commercial AC power source that is supplied after installation of the power conditioner or the power conversion device, or a direct current supplied from a battery installed in the power conditioner or the power conversion device. It may be a power source.

  Next, the operation of the power supply apparatus 100 according to the present embodiment will be described with reference to FIG. 1 and FIG. FIG. 2 is a diagram illustrating a specific operation example of the power supply device according to the embodiment.

  The example shown in FIG. 2 shows a specific example in the system configuration example provided with only the load device 3a. In this case, since the load devices 3b and 3c are not provided, the output reference potential point GND-B of the second DC power supply circuit 5b and the output reference potential of the second DC power supply circuit 5c when the open / close means 8b and 8c are opened. The point GND-C is in a floating state, which is not preferable. For this reason, it is necessary to close the opening / closing means 8b and 8c.

  On the other hand, when the opening / closing means 8a is closed, a ground loop indicated by a broken-line arrow in FIG. 2 is generated via the harnesses 10, 11a, and 12a. In this state, a current flows due to a potential difference generated in the ground loop, and so-called ground loop noise may occur. For this reason, it is necessary to keep the opening / closing means 8a open so as not to form a ground loop.

  Therefore, in the present embodiment, each energization control unit 9a, 9b, 9c is connected between both ends of each opening / closing means 8a, 8b, 8c, that is, the output reference potential point GND-M of the first DC power supply circuit 4 and the first. Between the output reference potential point GND-A of the second DC power supply circuit 5a, the output reference potential point GND-M of the first DC power supply circuit 4, and the output reference potential point GND-B of the second DC power supply circuit 5b. Between the output reference potential point GND-M of the first DC power supply circuit 4 and the output reference potential point GND-C of the second DC power supply circuit 5c. In the state, the opening / closing means 8a, 8b, and 8c are closed.

  Thereby, in the power supply board (not shown) in which the control power supply generation unit 1 is configured, the second DC power supply circuit (in FIG. 2) to which the load device (3b, 3c in the example shown in FIG. 2) is not connected. In the example shown, the output reference potential point (GND-B, GND-C in the example shown in FIG. 2) is connected to the output reference potential point GND-M of the first DC power supply circuit 4 in the example shown in FIG. In the second DC power supply circuit (5a in the example shown in FIG. 2) connected to (3a in the example shown in FIG. 2), the output reference potential point (GND-A in the example shown in FIG. 2) is the first Since it is disconnected from the output reference potential point GND-M of the DC power supply circuit 4, the generation of ground loop noise can be prevented without forming a ground loop (broken arrow shown in FIG. 2).

  It should be noted that the conduction state detection technique by each of the conduction control units 9a, 9b, 9c can be realized using a known technique, and the present invention is realized by the conduction state detection technique by each of the conduction control parts 9a, 9b, 9c. Is not limited.

  Next, the control operation of the power supply apparatus 100 according to the present embodiment will be described with reference to FIGS. FIG. 3 is an example of a control flowchart of the power supply apparatus according to the embodiment.

  When the power supply of the power conditioner or power conversion device on which the power supply device 100 according to the embodiment is mounted is turned on and the external power supply Vd is input to the control power generation unit 1 (step ST101), each energization control unit 9a. , 9b, 9c are activated (step ST102), and continuity determination between both ends of each of the opening / closing means 8a, 8b, 8c is performed (step ST103).

  For example, as shown in FIG. 2, when the load device 3a is connected, since both ends of the opening / closing means 8a are in a conductive state (step ST103; Yes), the energization control unit 9a performs the second direct current. The power supply circuit 5a is activated (step ST104), and the supply of the second DC power supply Vcc-A to the load device 3a is started.

  Further, as shown in FIG. 2, when the load devices 3b, 3c are not connected, both ends of the opening / closing means 8b, 8c are in a non-conducting state (step ST103; No), so that the energization control unit 9b, 9c closes and controls the opening / closing means 8b and 8c (step ST105), and sets the output reference potential point GND-B of the second DC power supply circuit 5b and the output reference potential point GND-C of the second DC power supply circuit 5c. The output reference potential point GND-M of the first DC power supply circuit 4 is connected.

  Thereafter, the load control unit 2 starts control of the load device 3a (step ST106), and ends this control flow.

  As described above, according to the power supply apparatus of the embodiment, the output reference potential point of the first DC power supply circuit that generates the first DC power supply supplied to the load control unit, and the first output supplied to the load apparatus. A normally open switching means is provided between the output reference potential point of the second DC power supply circuit that generates the second DC power supply, and the output reference potential of the first DC power supply circuit is provided between both ends of the switching means. Since the open / close means is controlled to be closed when the point and the output reference potential point of the second DC power supply circuit are in a non-conductive state, the load is included in the power supply board in which the control power supply generation unit is configured. In the second DC power supply circuit to which no device is connected, the output reference potential point is connected to the output reference potential point of the first DC power supply circuit, and in the second DC power supply circuit to which the load device is connected, the output The reference potential point is the output of the first DC power supply circuit Even when the load control unit that transmits the control signal to the load device and the control power generation unit that supplies the direct current power to the load device and the load control unit are separated from the quasi-potential point, The formation of ground loop noise can be prevented without being formed.

  In the above-described embodiment, the configuration in which three load devices can be connected has been described. However, the present invention is not limited by the number of connectable load devices, and one, two, or four or more loads can be connected. It goes without saying that the same effect can be obtained even if the apparatus can be connected.

  In the above-described embodiment, an example in which different second DC power supplies are supplied to connectable load devices has been described. However, the same first DC power supply circuit can be connected to a plurality of load devices from one second DC power supply circuit. The power supply control unit for controlling each switching means and each second DC power supply circuit may be a single component, and a plurality of switching means and second DC power supplies may be provided. The power supply circuit may be controlled.

  Note that the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.

  As described above, the power supply device according to the present invention is useful for a power supply device that performs power supply and control to each load device that constitutes a power supply system centered on a power conditioner and a power conversion device, In particular, in a configuration in which a load control unit that transmits a control signal to the load device and a control power generation unit that supplies DC power to the load device and the load control unit are installed apart from each other, generation of ground loop noise is prevented in advance. Suitable as a technology that can.

  DESCRIPTION OF SYMBOLS 1 Control power supply part, 2 Load control part, 3a, 3b, 3c Load apparatus, 4 1st DC power supply circuit, 5a, 5b, 5c 2nd DC power supply circuit, 6 Microcomputer, 7a, 7b, 7c Load, 8a , 8b, 8c Opening / closing means, 9a, 9b, 9c energization control unit, 10, 11a, 11b, 11c, 12a, 12b, 12c harness, 100 power supply device.

Claims (3)

A power supply device that converts DC or AC power supplied from an external power source into DC power and supplies the load device,
A load control unit for controlling the load device;
A control power generation unit that generates one first DC power source that supplies power to the load control unit using the external power source and one or more second DC power sources that supply the load device;
With
The control power generator is
A first DC power supply circuit for generating the first DC power supply;
A second DC power supply circuit for generating the second DC power supply;
A normally open switching means provided between an output reference potential point of the first DC power supply circuit and an output reference potential point of the second DC power supply circuit;
It is operated by the external power supply, and after the start of the external power supply, the conduction / non-conduction between the output reference potential point of the first DC power supply circuit and the output reference potential point of the second DC power supply circuit is determined. And an energization control unit that controls to close the opening and closing means when in a non-conductive state;
A power supply device comprising:   The energization control unit is configured to enable the second DC power supply circuit when the output reference potential point of the first DC power supply circuit and the output reference potential point of the second DC power supply circuit are in a conductive state. The power supply device according to claim 1, wherein the power supply device is activated.   The connection between the output reference potential point of the first DC power supply circuit and the output reference potential point of the second DC power supply circuit is established by connecting the load device. The power supply apparatus according to 1 or 2.

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