Power supply circuit and power supply method

Abstract

When one or more of the multiple power supply circuits stops supplying power to a load, this contributes to stabilizing the voltage of the power supply line connecting the load and the power supply circuit that has stopped supplying power. [Solution] The power supply circuit disclosed herein comprises a first power supply circuit that starts or stops supplying power to one or more loads, a second power supply circuit that supplies power to one or more loads, including at least one of the one or more loads that are supplied with power by the first power supply circuit, independently of the first power supply circuit, and a relay. The relay is configured so that, when the first power supply circuit supplies power to the one or more loads, a power supply line between the first power supply circuit and the one or more loads and a contact connecting between one end of a resistor whose other end is connected to ground and the power line are opened, and when the first power supply circuit stops supplying power to the one or more loads, the contact is closed, and the relay is configured so that, when the first power supply circuit supplies power to the one or more loads, a power supply line between the first power supply circuit and the one or more loads and a contact connecting between the other end of a resistor whose other end is connected to ground and the power line are opened, and when the first power supply circuit stops supplying power to the one or more loads, the contact is closed, and the relay is configured so that, when the first power supply circuit supplies power to the one or more loads, a contact is opened, and the contact is closed.

Description

[Technical Field]

[0001] The present disclosure relates to a power supply circuit and a power supply method. [Background technology]

[0002] Multiple power supply circuits may be connected to one or more electronic circuits to prevent interruptions in power supply by providing redundancy. The multiple power supply circuits are connected to one or more electronic circuits so that even if power supply from one of the power supply circuits stops, power can be supplied from the other power supply circuits. Patent Document 1 discloses an electronic circuit and a power supply device connected in this manner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-148773 Summary of the Invention [Problem to be solved by the invention]

[0004] The disclosures of the above prior art documents are incorporated herein by reference.The following analysis was conducted by the inventors.

[0005] When one of multiple power supply circuits stops supplying power to an electronic circuit, the voltage of the power line connecting the stopped power supply circuit to the electronic circuit should be ground voltage, e.g., 0V. However, even in the power supply line connecting the stopped power supply circuit to the electronic circuit, a voltage may be generated due to power leaking from other power supply circuits that continue to supply power via the electronic circuit. Such a voltage may cause the operation of other power supply circuits and electronic circuits to become unstable. Therefore, it is not recommended to leave power lines that are not used for power supplying unconnected to ground or some other component with a stable power supply.

[0006] In view of the above-mentioned problems, an object of the present disclosure is to contribute to stabilizing the voltage of a power supply line connecting a power supply circuit that has stopped supplying power to one or more electronic circuits in a configuration in which multiple power supply circuits are connected to one or more electronic circuits, when one or more of the multiple power supply circuits stops supplying power to the electronic circuit. [Means for solving the problem]

[0007] In a first aspect of the present disclosure, there is provided a power supply circuit including: a first power supply circuit that starts or stops supplying power to one or more loads; a second power supply circuit that supplies power to one or more loads, including at least one of the one or more loads supplied with power by the first power supply circuit, independently of the first power supply circuit; and a relay. In this power supply circuit, the relay is configured so that, when the first power supply circuit supplies power to the one or more loads, a power supply line between the first power supply circuit and the one or more loads and a contact connecting one end of a resistor, one end of which is connected to ground, and the power supply line are opened, and when the first power supply circuit stops supplying power to the one or more loads, the relay is configured so that the contact is closed, and

[0008] In a second aspect of the present disclosure, there is provided a power supply method using a power supply circuit including: a first power supply circuit that starts or stops supplying power to one or more loads; a second power supply circuit that supplies power to one or more loads, including at least one of the one or more loads that is powered by the first power supply circuit, independently of the first power supply circuit; and a relay. In this power supply method, when the first power supply circuit supplies power to the one or more loads, the contacts of the relay that connects a power line between the first power supply circuit and the one or more loads and one end of a resistor whose other end is connected to ground and the power line are opened, and when the first power supply circuit stops supplying power to the one or more loads, the contacts of the relay are closed, [Effects of the Invention]

[0009] According to each aspect of the present disclosure, in a configuration in which multiple power supply circuits are connected to one or more electronic circuits, when one or more of the multiple power supply circuits stops supplying power to the electronic circuit, it is possible to contribute to stabilizing the voltage of the power supply line connecting the power supply circuit that has stopped supplying power to the electronic circuit. [Brief explanation of the drawings]

[0010] [Figure 1A] FIG. 1A is a diagram illustrating a schematic configuration of a power supply device according to the present disclosure. [Figure 1B] FIG. 1B is a diagram illustrating one operation of the relay shown in FIG. 1A. [Figure 2A] FIG. 2A is a diagram illustrating an example configuration of a power supply system according to the present disclosure. [Figure 2B] FIG. 2B is a diagram illustrating an example configuration of a power supply system according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, the present disclosure is not limited to the embodiments described below. Furthermore, in each drawing, the same or corresponding elements are appropriately designated by the same reference numerals. Furthermore, it should be noted that the drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. Furthermore, the dimensional relationships and ratios between the drawings may differ. Furthermore, connecting lines between blocks of the drawings, etc. referred to in the following description include both bidirectional and unidirectional lines. Unidirectional arrows schematically indicate the direction of current, etc., and do not exclude bidirectionality.

[0012] Fig. 1A is a diagram illustrating a schematic configuration of a power supply device 10 according to the present disclosure. Fig. 1B is a diagram illustrating a configuration and operation of a relay 2 shown in Fig. 1A. Figs. 2A and 2B are diagrams illustrating an example configuration of a power supply system 1 according to the present disclosure. As shown in Fig. 1A, the power supply device 10 includes two power supply circuits 100-1 and 100-2, a relay 2, and a power line 104-1 connecting the power supply circuit 100-1 and the relay 2.

[0013] As shown in FIG. 1B, the relay 2 shown in FIG. 1A includes terminals A to F and an input terminal for a control signal S. Inside the relay 2, terminals A, C, D, and F are connected to fixed contacts, and terminals B and E are connected to movable contacts. As indicated by the symbol a in FIG. 1B, when the voltage value of the control signal S indicates that power is being supplied from the power supply circuit 100-1 (ON), the movable contact connected to terminal B and the fixed contact connected to terminal C come into contact with each other and are in a closed state, and the movable contact connected to terminal E and the fixed contact connected to terminal D come into contact with each other and are in a closed state. Meanwhile, at this time, as indicated by the dotted lines in FIG. 1B, the movable contact connected to terminal B and the fixed contact connected to terminal A are disconnected and released to be in an open state, and the movable contact connected to terminal E and the fixed contact connected to terminal F are disconnected and released to be in an open state.

[0014] 1B, when the voltage value of the control signal S indicates that power is not being supplied by the power supply circuit 100-1 (OFF), the movable contact connected to terminal B and the fixed contact connected to terminal A come into contact with each other and are in a closed state, and the movable contact connected to terminal E and the fixed contact connected to terminal F come into contact with each other and are in a closed state. Meanwhile, at this time, as shown by the dotted lines in FIG. 1B, the connection between the movable contact connected to terminal B and the fixed contact connected to terminal C is cut off and released to be in an open state, and the connection between the movable contact connected to terminal E and the fixed contact connected to terminal D is cut off and released to be in an open state.

[0015] As shown in Figures 2A and 2B, the power supply system 1 includes the power supply device 10 shown in Figure 1A, a power supply line 104-2 connecting the power supply circuit 100-1 of the power supply device 10 and electronic circuits 102-1 and 102-2 (loads), a power supply line 104-3 connecting the relay 2 of the power supply device 10 and electronic circuits 102-2 and 102-3 (loads), signal lines 106-1 to 106-3 used for bidirectional input and output of signals between the electronic circuits 102-1 to 102-3 and electronic circuits (not shown) external to the power supply system 1, and a signal line 106-4 used for bidirectional input and output of signals between the electronic circuits 102-2 and 102-3.

[0016] That is, in the power supply system 1, the electronic circuit 102-1 receives power only from the power supply circuit 100-2, and the electronic circuit 102-2 can receive power from both the power supply circuits 100-1 and 100-2. The electronic circuit 102-3 receives power only from the power supply circuit 100-1. The power supply system 1 also includes a diode (Di; Diode) 108 and a resistor (R; Resistor) 110 connected to the relay 2. Hereinafter, when referring to one of multiple possible components without specifying it, such as "electronic circuits 102-1 to 102-3," the subscript "-1" or the like may be omitted, and the component may simply be referred to as "electronic circuit 102," etc.

[0017] 2A and 2B, the numbers 1 to 8 attached near relay 2 indicate the numbers of terminals 1 to 8 of relay 2. Terminals A to F of relay 2 shown in FIG. 1B correspond to terminals 2 to 7 of relay 2 in FIGS. 2A and 2B, respectively, and the input terminal of control signal S shown in FIG. 1B corresponds to terminals 1 and 8 of relay 2 in FIGS. 2A and 2B. Terminals 1 and 3 of relay 2 are connected to a power output terminal (not shown) of power supply circuit 100-1 via power supply line 104-1, and terminal 8 is connected to ground. Nothing is connected to terminals 2 and 5 of relay 2, terminals 4 and 7 are connected to electronic circuits 102-2 and 102-3 via power supply line 104-3, and terminal 6 is connected to ground via resistor 110.

[0018] However, the numbers of terminals 1 to 8 of relay 2 and the variable contacts and fixed contacts connected to these terminals shown in Figures 1B, 2A, and 2B are merely examples and do not limit the configuration or type of relay 2. Furthermore, the number of electronic circuits 102 is not limited to three and can be any number equal to or greater than one by appropriate modifications to power supply system 1. Similarly, the number of power supply circuits 100 is not limited to two and can be any number equal to or greater than two. Furthermore, between the one or more electronic circuits 102 to which power is supplied by power supply circuit 100-1 and the one or more electronic circuits 102 to which power is supplied by power supply circuit 100-2, there are always one or more electronic circuits 102 to which power is supplied by both power supply circuits 100-1 and 100-2 (electronic circuit 102-2 in Figures 2A and 2B).

[0019] First, we will explain the outline of the operation of the power supply system 1. With these components, the power supply system 1 supplies power from a power supply circuit 100-1 (first power supply circuit) to electronic circuits 102-2 and 102-3 via a power supply line 104-1, a relay 2, and a power supply line 104-3. The power supply system 1 also supplies power from a power supply circuit 100-2 (second power supply circuit) to electronic circuits 102-1 and 102-2 via a power supply line 104-2. The positive power supply voltage (Vcc) supplied from the power supply circuits 100-1 and 100-2 to the electronic circuits 102-1 to 102-3 is, for example, +3.3 V, and the maximum current value is approximately 2 A. Also, for example, when the resistance value of resistor 110 is 500Ω and the maximum voltage value expected to occur on power supply line 104-3 after power supply circuit 100-1 stops supplying power is 0.5V (500mV), the power consumed by resistor 110 is 0.0005W (0.5mW) or less.

[0020] In the following description, the power supply ground and negative power supply have the same meaning, and a specific example will be given in which the voltage value (Vss) of the power supply ground is 0 V. When the power supply circuit 100-1 stops supplying power to the electronic circuits 102-2 and 102-3, the power supply system 1 connects the power supply line 104-3 connecting the relay 2 and the electronic circuits 102-2 and 102-3 to the power supply ground via the resistor 110. However, depending on the configuration of each of the electronic circuits 102-1 to 102-3, the ground voltage value does not need to be 0 V, and in such cases, the configuration of each of the power supply circuits 100-1 and 100-2 is also changed according to the ground voltage value.

[0021] Next, each component of the power supply system 1 will be described. The power supply circuits 100-1 and 100-2 include, for example, a rectifier circuit and a series regulator, or a switching power supply device. The power supply circuits 100-1 and 100-2 convert power supplied from a battery or a commercial AC power supply into power of a positive power supply voltage (Vcc) suitable for operation of the electronic circuits 102-1 to 102-3. The power supply circuit 100-1 outputs the power converted to the positive power supply voltage from a positive voltage power supply output terminal via a power supply line 104-1, a relay 2, and a power supply line 104-3 to power supply input terminals (not shown) of the electronic circuits 102-2 and 102-3, thereby supplying power to the electronic circuits 102-2 and 102-3. The power supply circuit 100-2 also outputs the power converted to the positive power supply voltage from a power supply output terminal via a power supply line 104-2 to the electronic circuits 102-1 and 102-2, thereby supplying power to the electronic circuits 102-1 and 102-2.

[0022] In the following description, as described above, a specific example will be taken of a case in which relay 2 is connected to power supply circuit 100-1 via power supply line 104-1, and electronic circuits 102-2 and 102-3 are connected to relay 2 via power supply line 104-3. Power supply circuit 100-1 supplies power to electronic circuits 102-2 and 102-3 via power supply lines 104-1 and 104-3 and relay 2, but the power supply to electronic circuits 102-2 and 102-3 may be stopped due to human error or a malfunction, etc. In the following description, as described above, a specific example will be taken of a case in which electronic circuits 102-1 and 102-2 are connected to power supply circuit 100-2 via power supply line 104-2 without via relay 2, and are constantly supplied with power.

[0023] For example, power supply circuit 100-1 is a so-called DC power supply device that receives power from a commercial power source (AC power source), starts supplying power to electronic circuits 102-2 and 102-3 when an operator of power supply system 1 operates a power switch (not shown) provided on power supply circuit 100-1 to start power supply, and stops power supply when an operation to stop power supply is performed. Receiving power from a commercial power source means, for example, inserting the plug of the power cable of power supply circuit 100-1 into a commercial power outlet. Also, for example, power supply circuit 100-2 is a so-called AC-linked power supply device that automatically starts supplying power without operating the power switch when it receives power from the commercial power source.

[0024] In the power supply system 1, when the power supply circuit 100-2 stops supplying power to the electronic circuits 102-1 and 102-2, the operation of the electronic circuit 102-1 is sure to stop. On the other hand, when the power supply circuit 100-1 stops supplying power to the electronic circuits 102-2 and 102-3, the operation of the electronic circuit 102-3 is sure to stop, but the occurrence of abnormal voltage on the power supply line 104-3 is prevented. Furthermore, when there is a possibility that the power supply circuit 100-2 will stop supplying power, a relay (FIGS. 1A, 2A, and 2B) to which a diode and a resistor are connected and a power supply line connecting the power supply circuit 100-2, the relay, and the electronic circuit 102 may be connected to the power supply circuit 100-2.

[0025] 2A and 2B illustrate an example in which the electronic circuits 102-1 to 102-3 are all powered by a single positive voltage, e.g., +3.3 V (Vcc = +3.3 V). However, this voltage is merely an example. That is, the electronic circuits 102-1 to 102-3 may be powered by the same or different positive voltages other than +3.3 V, the same or different negative voltages, or multiple voltages, regardless of whether they are positive or negative. In such cases, the power supply circuits 100-1 and 100-2 must be configured to output power of two or more voltages suitable for the electronic circuits 102-1 to 102-3 to supply power to the electronic circuits 102-1 to 102-3. Furthermore, in such cases, the number of power supply lines 104 and relays 2, and the connections between the relays 2, the power supply circuit 100, and the electronic circuits 102 via the power supply lines 104 must also be appropriately changed.

[0026] The electronic circuits 102-1 to 102-3 are composed of a printed circuit board on which the electronic circuit is arranged, a housing that houses the printed circuit board, and connectors used for power supply and signal input / output. The electronic circuit is a digital circuit that includes, for example, a processor such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), and a DSP (Digital Signal Processor), a logic circuit such as an FPGA (Field Programmable Gate Array), and peripheral circuits thereof. Alternatively, the electronic circuit is an analog circuit that is composed of an analog integrated circuit such as an OP amplifier (OPerational Amplifier), semiconductor elements such as transistors, FETs (Field Effect Transistors), and diodes, and passive elements such as diodes, resistors, capacitors, and coils.

[0027] Note that, since only electronic circuit 102-2 receives power supply from both power supply circuits 100-1 and 100-2, for example, electronic circuits 102-1 and 102-3 may be considered to be circuits of low importance that are allowed to stop operating, and electronic circuit 102-2 may be considered to be a circuit of high importance that is not allowed to stop operating. Also, electronic circuit 102-2 may include components that automatically start operating when power is supplied without operating a power switch, and components that start operating when power is supplied and the power switch is operated to start operation, and stop operating when the power switch is operated to stop operation.

[0028] Alternatively, the electronic circuit may be a combination of a digital circuit and an analog circuit. One or more of the electronic circuits 102-1 to 102-3 may be replaced with an electric motor such as a motor, a light-emitting device such as an LED, or an electric circuit composed only of passive elements without active elements. In such cases, in this disclosure, the electric motor, the light-emitting device, and the electric circuit are considered to be equivalent to the electronic circuit.

[0029] The power supply lines 104-1 to 104-3 are composed of wiring members including conductors, such as electric wires or conductive patterns on printed circuit boards, that enable power supply from the power supply circuits 100-1 and 100-2 to the electronic circuits 102-1 to 102-3 and the relay 2. The power supply line 104-1 connects the power supply output terminal of the power supply circuit 100-2 to terminals 1 and 3 of the relay 2. The power supply line 104-2 connects the power supply output terminal of the power supply circuit 100-2 to the power supply input terminals of the electronic circuits 102-1 and 102-2 without passing through the relay 2. The power supply line 104-3 connects terminals 4 and 7 of the relay 2 to the power supply input terminals of the electronic circuits 102-2 and 102-3.

[0030] The signal lines 106-1 to 106-4 are composed of wiring members such as optical fibers, electric wires, and connectors connected to the wiring patterns of the electronic circuits 102-1 to 102-3, which are capable of transmitting and receiving signals between the electronic circuits 102-1 to 102-3 and electronic circuits external to the power supply system 1, and between the electronic circuits 102-2 and 102-3. The signal lines 106-1 to 106-3 connect the electronic circuits 102-1 to 102-3 and electronic circuits external to the power supply system 1 so that signals can be transmitted and received in both directions. The signal line 106-4 connects the electronic circuits 102-2 and 102-3 so that signals can be transmitted and received in both directions using wiring members including conductors and the connectors. The electronic circuits 102-1 and 102-2 and / or the electronic circuits 102-1 and 102-3 may be further connected to each other so that signals can be transmitted and received bidirectionally via a signal line 106. The electronic circuits 102-1 to 102-3 may also be connected to each other by a wiring pattern (not shown) provided on a back panel to which they are fixed by the connectors or the like.

[0031] Relay 2 may be a mechanical relay for power control in which power supply circuit 100-1 turns on / off (ON / OFF) a current flowing through an electromagnet coil to drive and move a movable contact, causing the movable contact and fixed contact, each made of a conductor, to come into contact and connect to a closed state, or to disconnect and open to an open state. In this case, part of the power supplied by power supply circuit 100-1 to electronic circuits 102-2 and 102-3 corresponds to control signal S shown in FIG. 1B. However, as described above, when the value of the current flowing through resistor 110 is small, about 1 mA (=0.5 V / 500 Ω), a signal relay may be used as relay 2 instead of a power control relay.

[0032] Inside relay 2, terminals 1 and 8 are connected to a coil that drives the movable terminal of the relay, terminal 1 is connected to power supply circuit 100-1 via power supply line 104-1, and terminal 8 is connected to ground. In other words, while power supply circuit 100-1 supplies power to electronic circuits 102-2 and 102-3 via power supply lines 104-1 and 104-3, power is also supplied to the coil inside relay 2, and current flows through the coil, which drives the movable contact inside relay 2. On the other hand, while power supply circuit 100-1 stops supplying power to electronic circuits 102-2 and 102-3, power supply to the coil inside relay 2 is also stopped, no current flows through the coil, and the coil does not drive the movable contact inside relay 2.

[0033] The anode of diode 108 is connected to terminal 1 of relay 2, and the cathode of diode 108 is connected to terminal 8 and the ground. Diode 108 absorbs the counter electromotive force that occurs across its two ends when power supply to the coil is turned on or off (ON / OFF). However, if the coil of relay 2 has a built-in diode that absorbs counter electromotive force, there is no need to attach diode 108 externally to relay 2. When power supply circuit 100-1 supplies negative voltage power to electronic circuits 102-2 and 102-3, the polarity of diode 108 is reversed.

[0034] Terminals 2 and 5 of relay 2 are connected to fixed contacts inside relay 2, but are not connected to any components outside relay 2. Terminals 3 and 6 are each connected to separate variable contacts inside relay 2, terminal 3 is connected to power supply line 104-1 outside relay 2, and terminal 6 is connected to one end of resistor 110 outside relay 2 and is connected to ground via resistor 110. Terminals 4 and 7 are each connected to separate fixed contacts inside relay 2, and terminals 4 and 7 are connected to power supply line 104-3 outside relay 2.

[0035] When current flows through the coil, the movable contact connected to terminals 3 and 6 of relay 2 is driven, causing the movable contact connected to terminal 3 and the fixed contact connected to terminal 4 to come together and close, connecting power lines 104-1 and 104-3. Meanwhile, the movable contact connected to terminal 6 and the fixed contact connected to terminal 5 come together and close, but since terminal 5 is in an open state with nothing connected, terminal 6 is also in an open state with nothing connected. Note that terminals 2 and 3 and terminals 6 and 7 of relay 2 are open, as shown by the dotted lines.

[0036] When current stops flowing through the coil, the movable contact connected to terminals 3 and 6 of relay 2 is no longer driven, and the movable contact connected to terminal 3 and the fixed contact connected to terminal 2 come together and enter a closed state, but because nothing is connected to terminal 2, terminal 3 also enters a state where nothing is connected. Meanwhile, the movable contact connected to terminal 6 comes together and enters a closed state, and terminals 6 and 7 connect power supply line 104-3 to ground via resistor 110.

[0037] Below, the details of the operation of the power supply system 1 will be explained separately for the case where the power supply circuit 100-1 is supplying power to the electronic circuits 102-2 and 102-3 and the case where the power supply is stopped. First, the operation of the power supply system 1 when the power supply circuit 100-1 is supplying power to the electronic circuits 102-2 and 102-3 (ON) will be explained. As shown in Fig. 2A, when the power supply circuit 100-1 is supplying power to the electronic circuits 102-2 and 102-3 (ON), power is supplied to the coil of the relay 2 connected between the terminals 1 and 8 of the relay 2, and current flows through the coil.

[0038] As a result, the movable contact connected to terminals 3 and 6 is driven, connecting terminals 3 and 4 and terminals 5 and 6 to a closed state, thereby establishing electrical continuity between terminals 3 and 4 and between terminals 5 and 6. Meanwhile, as indicated by the dotted lines, terminals 2 and 3 and terminals 6 and 7 are opened to an open state, resulting in no electrical continuity between terminals 2 and 3 and between terminals 6 and 7. As a result, power lines 104-1 and 104-3 are connected. Power is supplied from both power supply circuits 100-1 and 100-2 to electronic circuit 102-2, power is supplied from power supply circuit 100-1 to electronic circuit 102-3, and power is supplied from power supply circuit 100-2 to electronic circuit 102-2. Therefore, all of electronic circuits 102-1 to 102-3 operate normally.

[0039] Next, we will explain the operation of the power supply system 1 when the power supply circuit 100-1 stops supplying power to the electronic circuits 102-2 and 102-3. As shown in FIG. 2B , when the power supply circuit 100-1 stops (turns off) the power supply to the electronic circuits 102-2 and 102-3, power is no longer supplied to the coil of the relay 2 connected between terminals 1 and 8 of the relay 2, and no current flows through the coil. In this case, as indicated by the dotted arrow in FIG. 2B , for example, power may leak into the power supply line 104-3 from a component of the electronic circuit 102-1 to which power is supplied by the power supply circuit 100-2. Alternatively, power leaking from the electronic circuit 102-1 to the electronic circuit 102-2 may further leak into the signal line 106-3 via the signal line 106-4 and the components of the electronic circuit 102-2. As a result, if no countermeasures are taken, the voltage value of the power supply line 104-3 may rise, potentially causing instability.

[0040] As a result, the movable contact connected to terminals 3 and 6 is no longer driven, and as shown by the dotted lines, terminals 3 and 4 and terminals 5 and 6 are disconnected and placed in an open state, resulting in no electrical continuity between terminals 3 and 4 and between terminals 5 and 6. Meanwhile, terminals 2 and 3 and terminals 6 and 7 are abutted and connected and placed in a closed state, resulting in electrical continuity between terminals 2 and 3 and between terminals 6 and 7. As a result, the connection between power supply lines 104-1 and 104-3 is cut and placed in an open state, and power is supplied from power supply circuit 100-2 only to electronic circuits 102-1 and 102-2 via power supply line 104-2. Furthermore, power supply line 104-3 is connected to ground via resistor 110, and the voltage value of power supply line 104-3 becomes 0 V or a voltage slightly higher than 0 V on the positive side, and becomes stable. Even if the power supply from the power supply circuit 100-1 to the electronic circuits 102-2 and 102-3 is stopped, the power supply circuit 100-2 continues to supply power to the electronic circuits 102-1 and 102-2. Therefore, although the operation of the electronic circuit 102-3 stops, the electronic circuits 102-1 and 102-2 continue to operate normally.

[0041] The power supply system 1 is configured and operates as described above. Therefore, while the power supply circuit 100-1 is supplying power, the power supply lines 104-1 and 104-3 are connected, and power is supplied from the power supply circuit 100-1 to the electronic circuits 102-2 and 102-3 via the power supply lines 104-1 and 104-3. In this case, the power supplied from the power supply circuit 100-1 to the electronic circuits 102-2 and 102-3 passes through a conductor contact that does not create a potential difference. Therefore, in the power supply system 1, there is no voltage drop, which occurs when a PN connection or a semiconductor channel occurs when a current passes through a semiconductor channel, as occurs when a transistor, FET, diode, or the like is inserted into the power supply lines 104-1 and 104-3 for control. Furthermore, while the power supply circuit 100-1 is supplying power, the resistor 110 is disconnected from the power supply lines 104-1 and 104-3, so no current flows through the resistor 110, and no power loss occurs due to the resistor 110.

[0042] When the power supply drops due to active elements such as diodes or transistors can be ignored in the power supplied by power supply circuits 100-1 and 100-2, a solid-state relay that uses a semiconductor element to close or open the terminals in response to the value of an external control signal can be used instead of a mechanical relay as relay 2. When a solid-state relay is used as relay 2, relay 2 receives an input of a control signal indicating whether power supply circuit 100-1 is supplying power, and performs the operation described with reference to FIG.

[0043] Furthermore, because no active elements such as transistors and FETs are used for power control in power supply device 10, when the power supply circuit 100-1 stops supplying power, power supply line 104-3 is connected to ground via resistor 110 and its voltage is stabilized without controlling these active elements. Furthermore, because no diodes or active elements are inserted between power supply lines 104-1 and 104-3 connecting power supply circuit 100-1 and electronic circuits 102-2 and 102-3, or inside relay 2, no drop in power supply voltage occurs in the diodes or active elements.

[0044] Furthermore, according to the power supply system 1, the charge stored in the power supply line 104-3 flows to the ground via the resistor 110. Therefore, in the power supply system 1, a large current caused by the charge released from the power supply line 104-3 and the electronic circuits 102-2 and 102-3 connected thereto is not generated, and no problems caused by such a large current occur. Furthermore, according to the power supply system 1, as shown by the dotted line in FIG. 2B, it is possible to suppress instability of the voltage of the power supply line 104-3 caused by leakage of the power supplied by the power supply circuit 100-2 to the electronic circuits 102-1 and 102-2.

[0045] Some or all of the above embodiments can be described as, but are not limited to, the following supplementary notes. [Appendix 1] (See the first point above) [Appendix 2] 2. The power supply circuit of claim 1, wherein the resistor brings a voltage generated on the power supply line from the second power supply circuit through the one or more loads closer to a voltage of the ground when the first power supply circuit stops supplying power to the one or more loads. [Appendix 3] 3. The power supply circuit according to claim 1, wherein there are a plurality of the loads, and the voltage generated on the power supply line through one or more of the loads is generated on the power supply line via a conductor connecting the plurality of loads independently of the power supply line. [Appendix 4] The power supply circuit according to any one of appendices 1 to 3, wherein the relay closes a plurality of contacts and opens a plurality of contacts in response to the supply of current to a coil or the stop of the supply of current to the coil, the coil being connected between the power supply line and the ground, and when power is being supplied from the first power supply circuit to the one or more loads, the first power supply circuit supplies current to the coil of the relay, and when power supply from the first power supply circuit to the one or more loads is stopped, the first power supply circuit stops supplying current to the coil of the relay. [Appendix 5] 5. The power supply circuit according to claim 4, wherein the relay sets the contacts to an open state when current is supplied from the first power supply circuit to the coil, and sets the contacts to a closed state when current supply from the first power supply circuit to the coil is stopped. [Appendix 6] (See second viewpoint above) [Appendix 7] 7. The power supply method according to claim 6, wherein the resistor brings the voltage generated on the power supply line from the second power supply circuit through the one or more loads closer to the voltage of the ground when the first power supply circuit stops supplying power to the one or more loads. [Appendix 8] 8. The power supply method according to claim 6, wherein there are a plurality of the loads, and the voltage generated on the power supply line through the one or more loads is generated on the power supply line via a conductor connecting the plurality of loads independently of the power supply line. [Appendix 9] The power supply method according to any one of appendices 6 to 8, wherein the relay closes a plurality of contacts and opens a plurality of contacts in response to the supply or cessation of current supply to a coil, the coil being connected between the power supply line and the ground, and when power is being supplied from the first power supply circuit to the one or more loads, the first power supply circuit supplies current to the coil of the relay, and when power supply from the first power supply circuit to the one or more loads is halted, the first power supply circuit halts the supply of current to the coil of the relay. [Appendix 10] 10. The power supply method according to claim 9, wherein the contacts are opened when supplying current from the first power supply circuit to the coil, and are closed when stopping the supply of current from the first power supply circuit to the coil. It goes without saying that combinations of the various forms described in the appendix of this disclosure, or any combination of the elements described in each aspect and embodiment (including the non-selection of some elements), can be made at any time by those skilled in the art in accordance with the basic concept of this disclosure.

[0046] The disclosures of the above-cited patent documents and other documents are incorporated herein by reference. Modifications and adjustments of the embodiments and examples are possible within the scope of this disclosure (including the claims), and further based on its basic technical concept. Furthermore, various combinations and selections (including partial deletions) of various disclosed elements (including elements of each claim, each element of each embodiment or example, each element of each drawing, etc.) are possible within the scope of this disclosure. In other words, this disclosure naturally includes various modifications and alterations that would be possible by those skilled in the art in accordance with the entire disclosure and technical concept, including the claims. In particular, the numerical ranges described herein should be construed as specifically describing any numerical value or subrange within that range, even if not otherwise specified. Furthermore, the disclosures of the above-cited documents are deemed to be included in the disclosure of this application, in part or in whole, which may be used in combination with the disclosures herein, as part of the spirit of this disclosure, as necessary. [Explanation of symbols]

[0047] 1 Power Supply System 10 Power supply 100 Power circuit 102 Electronic circuits 104 Power Line 106 Signal Line 108 Diode 110 resistor 2 relays

Claims

1. a first power supply circuit for turning on or off power to one or more loads; a second power supply circuit that supplies power to one or more loads including at least one of the one or more loads that are supplied with power by the first power supply circuit, independently of the first power supply circuit; Relay and A power supply circuit comprising: The relay is a power supply line between the first power supply circuit and the one or more loads, and a contact connecting one end of a resistor having the other end connected to ground and the power supply line, are in an open state when the first power supply circuit supplies power to the one or more loads, and when the first power supply circuit stops supplying power to the one or more loads, the contact is in a closed state when the first power supply circuit stops supplying power to the one or more loads, The resistor causes a voltage generated on the power supply line from the second power supply circuit through the one or more loads to approach a voltage of the ground when the first power supply circuit stops supplying power to the one or more loads. power circuit.

2. The load is plural, The voltage generated on the power supply line via the one or more loads is generated on the power supply line via a conductor connecting the plurality of loads independently of the power supply line.

2. The power supply circuit according to claim 1.

3. the relay switches each of a plurality of contacts to a closed state or an open state in response to supplying or stopping current to a coil; the coil is connected between the power supply line and the ground; When power is being supplied from the first power supply circuit to the one or more loads, a current is supplied from the first power supply circuit to the coil of the relay, and when power supply from the first power supply circuit to the one or more loads is stopped, the current supply from the first power supply circuit to the coil of the relay is stopped.

2. The power supply circuit according to claim 1.

4. The relay sets the contacts to an open state when current is supplied from the first power supply circuit to the coil, and sets the contacts to a closed state when current supply from the first power supply circuit to the coil is stopped.

4. The power supply circuit according to claim 3.

5. A power supply method using a power supply circuit including: a first power supply circuit that starts or stops supplying power to one or more loads; a second power supply circuit that supplies power to one or more loads including at least one of the one or more loads that are supplied with power by the first power supply circuit, independently of the first power supply circuit; and a relay, when the first power supply circuit supplies power to the one or more loads, a contact of the relay connecting a power supply line between the first power supply circuit and the one or more loads and one end of a resistor having the other end grounded and the power supply line is set to an open state; and when the first power supply circuit stops supplying power to the one or more loads, a contact of the relay is set to a closed state. The resistor causes a voltage generated on the power supply line from the second power supply circuit through the one or more loads to approach the voltage of the ground when the first power supply circuit stops supplying power to the one or more loads. Power supply method.

6. The load is plural, The voltage generated on the power supply line via the one or more loads is generated on the power supply line via a conductor connecting the plurality of loads independently of the power supply line. The power supply method according to claim 5.

7. the relay switches each of a plurality of contacts to a closed state or an open state in response to supplying or stopping current supply to a coil, the coil being connected between the power supply line and the ground; When power is being supplied from the first power supply circuit to the one or more loads, a current is supplied from the first power supply circuit to the coil of the relay, and when power supply from the first power supply circuit to the one or more loads is stopped, the current supply from the first power supply circuit to the coil of the relay is stopped. The power supply method according to claim 5.

8. When a current is supplied from the first power supply circuit to the coil, the contact is in an open state, and When the supply of current from the first power supply circuit to the coil is stopped, the contact is brought into a closed state. The power supply method according to claim 7.

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