JP2018133923A - Power supply device and game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device that can stably apply a power supply voltage at the start-up while preventing from being broken when applied with a high voltage.SOLUTION: A power supply device 1 comprises a relay 10, a capacitor 13, a switch 14, an overvoltage detection circuit 16, and a switch control circuit 17. The relay 10 includes contacts 20a and 20b that open between a power supply terminal 18 and a load terminal 19 when the power supply device is turned off, and coils 21a and 21b that turn off the contacts 20a and 20b when an excitation current is not supplied and turn on the contacts 20a and 20b when the excitation current is supplied. The capacitor 13 is connected to the power supply terminal 18 at one end and connected in parallel to the coils 21a and 21b; the switch 14 is connected in series to the capacitor 13. The switch control circuit 17 is turned off when a power supply voltage is detected to be higher than a threshold voltage, and stops supply of the excitation current to the coils 21a and 21b to turn off the contacts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply device and a gaming machine having such a power supply device.

  In a game machine equipped with various boards having different operating voltages, a desired voltage is generated on each board with a single power supply board in order to reduce the size of the board by omitting the mounting of the transformer circuit. It is known to apply a measured voltage from a power supply substrate to each substrate. For example, in the gaming machine described in Patent Document 1, a single power supply board transforms an applied 24 V AC power supply voltage to a desired voltage, and applies the transformed voltage from the power supply board to each board.

  In addition, in a gaming facility where a gaming machine is installed, in addition to a 24V AC power source applied to the gaming machine, a 100V AC power source applied to an air conditioning facility, a cleaning facility, or the like coexists. Patent Document 2 includes a relay for overvoltage protection in order to prevent destruction when a 100 V AC voltage is applied to a gaming machine from a 100 V AC power source due to an erroneous connection of a power plug or the like. A power supply is described. The power supply device described in Patent Document 2 disposes a relay between a power supply input terminal and a diode bridge, and stops supplying excitation current to the relay coil when a 100 V AC voltage is applied to the gaming machine. By turning off the relay, the power supply device is prevented from being destroyed.

  Furthermore, in the power supply device described in Patent Document 2, the relay coil for overvoltage protection is not an electrolytic capacitor with a short lifetime of 100 V breakdown voltage, but a large smoothing coil disposed between the diode bridge and the DCDC converter circuit. An exciting current is supplied from the electrolytic capacitor having a capacity. The power supply device described in Patent Document 2 supplies excitation current to a relay coil from a smoothing electrolytic capacitor disposed between a diode bridge and a DCDC converter circuit. It is not necessary to arrange a capacitor. The power supply device described in Patent Document 2 can have a long life because a high withstand voltage electrolytic capacitor having a short life is not arranged for supplying an exciting current.

JP 2001-187191 A Japanese Patent No. 5505144

  However, in the power supply device described in Patent Document 2, the electrolytic capacitor that charges the voltage applied to the coil of the relay has a large capacity and is charged from the power source via the diode bridge. Become. The power supply device described in Patent Document 2 supplies an exciting current to the relay coil from an electrolytic capacitor having a long charging time, so that the operation of the relay becomes unstable at the start-up, and the power supply voltage is not stably applied to the load. There is a problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a power supply apparatus that can stably apply a power supply voltage at startup while preventing breakdown when a high voltage due to misconnection or the like is applied. .

  As one form of this invention, a power supply device has a relay, a capacitor | condenser, a switch, an overvoltage detection circuit, and a switch control circuit. The relay is arranged between the power terminal connected to the power source and the load terminal connected to the load, and opens between the power terminal and the load terminal when turned off, and the power terminal and the load terminal when turned on. And a coil that turns off the contact when the excitation current is not supplied and turns the contact on when the excitation current is supplied. The capacitor has one end connected to the power supply terminal and connected in parallel to the coil, and the switch is connected in series to the capacitor. The overvoltage detection circuit detects that the power supply voltage applied to the power supply terminal is higher than a predetermined threshold voltage. The switch control circuit turns on the switch when the overvoltage detection circuit does not detect that the power supply voltage is higher than the threshold voltage, applies the power supply voltage to the capacitor, supplies the exciting current to the relay coil, and contacts Is turned off when the overvoltage detection circuit detects that the power supply voltage is higher than the threshold voltage, and the application of the power supply voltage to the capacitor is stopped and the application of the power supply voltage to the capacitor is stopped. Then stop supplying the exciting current to the relay coil and turn the contact off.

  In this power supply device, the switch is connected in series to the coil together with the capacitor, and the coil is applied with the power supply voltage together with the capacitor when the switch is turned on, and the power supply voltage is stopped together with the capacitor when the switch is turned off. It is preferable.

  As one embodiment of the present invention, a gaming machine includes a load circuit and a power supply device that supplies power to the load circuit. The power supply device includes a relay, a capacitor, a switch, an overvoltage detection circuit, and a switch control circuit. The relay is arranged between the power terminal connected to the power source and the load terminal connected to the load, and opens between the power terminal and the load terminal when turned off, and the power terminal and the load terminal when turned on. And a coil that turns off the contact when the excitation current is not supplied and turns the contact on when the excitation current is supplied. The capacitor has one end connected to the power supply terminal and connected in parallel to the coil, and the switch is connected in series to the capacitor. The overvoltage detection circuit detects that the power supply voltage applied to the power supply terminal is higher than a predetermined threshold voltage. The switch control circuit turns on the switch when the overvoltage detection circuit does not detect that the power supply voltage is higher than the threshold voltage, applies the power supply voltage to the capacitor, supplies the exciting current to the relay coil, and contacts Is turned off when the overvoltage detection circuit detects that the power supply voltage is higher than the threshold voltage, and the application of the power supply voltage to the capacitor is stopped and the application of the power supply voltage to the capacitor is stopped. Then stop supplying the exciting current to the relay coil and turn the contact off.

  The power supply apparatus according to the present invention can stably apply the power supply voltage at the start-up while preventing the power supply apparatus from being broken when a high voltage due to misconnection or the like is applied.

1 is a circuit block diagram of a power supply device according to a first embodiment. It is a more detailed circuit block diagram of the power supply device according to the first embodiment. It is a timing chart for demonstrating operation | movement of the power supply device which concerns on 1st Embodiment. It is a circuit block diagram of the power supply device which concerns on 2nd Embodiment. It is a circuit block diagram of the power supply device which concerns on 3rd Embodiment. It is a more detailed circuit block diagram which shows the example of application of the power supply device which concerns on 3rd Embodiment. It is an arrangement plan of a ball game machine in a game facility. It is a schematic perspective view of the ball game machine provided with the power supply device which concerns on embodiment or a modification. It is a schematic rear view of the ball game machine shown in FIG.

  Hereinafter, a power supply device and a gaming machine equipped with the power supply device according to one embodiment of the present invention will be described with reference to the drawings. As described above, the power supply device according to the embodiment includes the capacitor connected in parallel to the relay coil and applying the power supply voltage to the relay coil, and the switch connected in series to the capacitor. The switch is turned on when the power supply voltage is equal to or lower than a threshold voltage higher than the rated voltage of the power supply device, and applies the power supply voltage to the capacitor. On the other hand, the switch is turned off when the power supply voltage is higher than the threshold voltage, and the application of the power supply voltage to the capacitor is stopped to prevent the high voltage from being applied to the power supply device. In this power supply device, when the power supply voltage is higher than the threshold voltage, the power supply voltage is not applied to the capacitor that supplies the exciting current to the relay coil, so a high voltage is applied to the capacitor that supplies the exciting current to the coil. There is no fear of being done. Therefore, in this power supply device, the exciting current supply capacitor does not have to use a high withstand voltage electrolytic capacitor. Also, in this power supply device, the exciting current supply capacitor is not used together with the smoothing capacitor, so a small-capacitance electrolytic capacitor connected in parallel to the relay coil is used for quick charging at startup, and power is supplied at startup. Voltage can be applied stably.

  FIG. 1 is a circuit block diagram of the power supply device according to the first embodiment.

  The power supply device 1 includes a relay 10, a first rectifier circuit 11, a DCDC converter circuit 12, a capacitor 13, a switch 14, a second rectifier circuit 15, an overvoltage detection circuit 16, a switch control circuit 17, a power supply It has a terminal 18 and a load terminal 19. When a 24V AC voltage is applied from the power supply 100 to the power supply terminal 18 via the fuse 101 and the power switch 102, the power supply device 1 converts the 24V AC voltage into a desired voltage by DC-DC conversion and loads the load terminal 19 to the load 105. Apply to. When a voltage higher than a threshold voltage such as a 100 V AC voltage is applied from the power supply 100, the power supply device 1 opens the relay 10 and stops applying the power supply voltage to the load 105.

  The relay 10 includes a pair of contacts 20 a and 20 b and a pair of coils 21 a and 21 b, and is disposed between a power terminal 18 connected to the power source 100 and a load terminal 19 connected to a load 105. The pair of contacts 20a and 20b of the relay 10 open between the power terminal 18 and the load terminal 19 when turned off, and connect between the power terminal 18 and the load terminal 19 when turned on. The pair of coils 21a and 21b of the relay 10 turn off the pair of contacts 20a and 20b of the relay 10 when the excitation current is not supplied, and the pair of contacts 20a and 20b of the relay 10 when the excitation current is supplied. Turn on each of the.

  The first rectifier circuit 11 includes a bridge diode circuit (not shown), and outputs a rectified voltage obtained by full-wave rectifying the 24 V AC voltage input from the power supply 100 to the DCDC converter circuit 12. The DCDC converter circuit 12 includes any one of a step-up circuit, a step-down circuit, and a step-up / step-down circuit. The DCDC converter circuit 12 smoothes the rectified voltage input from the first rectifier circuit 11 and boosts or steps down the voltage to a desired voltage. Output to. Since the circuit configurations of the booster circuit, the step-down circuit, and the step-up / step-down circuit are well known, detailed description thereof is omitted here.

  The capacitor 13 is, for example, an electrolytic capacitor to which a 24V AC voltage, which is the rated voltage of the power supply device 1, can be applied. One end of the capacitor 13 is connected to the power supply terminal 18 and the other end is grounded via the switch 14. The capacitor 13 is not likely to be destroyed even when a 24V AC voltage that is the rated voltage of the power supply device 1 is applied, but may be destroyed when a 100V AC voltage is applied due to misconnection or the like. There is. The capacitor 13 is connected in parallel to the pair of contacts 20 a and 20 b of the relay 10. The capacitor 13 is charged by a 24V AC voltage applied from the power supply 100 when the switch 14 is turned on, and supplies an exciting current to each of the pair of contacts 20a and 20b of the relay 10. Further, the capacitor 13 is discharged through the switch control circuit 17 while the current path charged by the voltage applied from the power supply 100 is cut off when the switch 14 is turned off. Since the capacitor 13 is discharged via the switch control circuit 17 when the switch 14 is turned off, the supply of the excitation current to the pair of contacts 20a and 20b of the relay 10 is stopped.

  The switch 14 is an nMOSFET, for example, and is connected in series to the pair of contacts 20 a and 20 b of the relay 10 and the capacitor 13. The gate of the switch 14 is connected to the switch control circuit 17, the source of the switch 14 is grounded, and the drain of the switch 14 is connected to the pair of contacts 20 a and 20 b of the relay 10 and the capacitor 13.

  The second rectifier circuit 15 includes a bridge diode circuit (not shown), and outputs a rectified voltage obtained by full-wave rectifying the 24V AC voltage input from the power supply 100 to the overvoltage detection circuit 16. The overvoltage detection circuit 16 outputs an overvoltage detection signal to the switch control circuit 17 when detecting that the power supply voltage applied to the power supply terminal 18 is higher than a predetermined threshold voltage. On the other hand, the overvoltage detection circuit 16 does not output an overvoltage detection signal to the switch control circuit 17 when it does not detect that the power supply voltage applied to the power supply terminal 18 is higher than the threshold voltage. The threshold voltage is higher than 24V and lower than 100V.

  The switch control circuit 17 turns on the switch 14 when the overvoltage detection circuit 16 does not detect that the power supply voltage is higher than the threshold voltage and the overvoltage detection signal is not input. When the switch 14 is turned on, the capacitor 13 is charged with a 24V AC voltage applied from the power supply 100, and supplies an exciting current to each of the pair of contacts 20a and 20b of the relay 10.

  The switch control circuit 17 turns off the switch 14 when the overvoltage detection circuit 16 detects that the power supply voltage is higher than the threshold voltage and receives an overvoltage detection signal. When the switch 14 is turned off, the capacitor 13 is discharged, and the supply of the excitation current to the pair of contacts 20a and 20b of the relay 10 is stopped.

  FIG. 2 is a more detailed circuit block diagram of the power supply device 1. The power supply device 1 converts the input power supply voltage Vin, which is an AC voltage, into a DC voltage having a desired voltage value, and outputs it as a load voltage Vout.

  The overvoltage detection circuit 16 includes an overvoltage detection element 31, a first overvoltage resistance element 32, a second overvoltage resistance element 33, a third overvoltage resistance element 34, and an overvoltage capacitor 35. The overvoltage detection element 31 is, for example, a Zener diode.

  The switch control circuit 17 includes a control diode 40, a first control resistance element 41 to a fourth control resistance element 44, a control switch 45, a switch protection element 46, and a control capacitor 47. The control switch 45 is, for example, an npn transistor, and the switch protection element 46 is, for example, a Zener diode.

  The cathode of the overvoltage detection element 31 is connected to the output terminal of the second rectifier circuit 15, and the anode of the overvoltage detection element 31 is connected to one end of the first overvoltage resistance element 32.

  The other end of the first overvoltage resistance element 32 is connected to one end of the second overvoltage resistance element 33 and the overvoltage capacitor 35, and the other end of the second overvoltage resistance element 33 is one end of the third overvoltage resistance element 34 and the base of the control switch 45. Connected to. The other ends of the third overvoltage resistance element 34 and the overvoltage capacitor 35 are grounded.

  The anode of the control diode 40 is connected to the power supply terminal 18, and the cathode of the control diode 40 is connected to one end of the first control resistance element 41, the capacitor 13, and the pair of coils 21 a and 21 b of the relay 10. The other end of the first control resistance element 41 is connected to one end of the second control resistance element 42, the third control resistance element 43 and the control capacitor 47, and the cathode of the switch protection element 46. The other end of the second control resistance element 42 is connected to the collector of the control switch 45, and the other end of the third control resistance element 43 is connected to one end of the fourth control resistance element 44 and the gate of the switch 14. The other end of the fourth control resistance element 44, the emitter of the control switch 45, the anode of the switch protection element 46, and the other end of the control capacitor 47 are grounded.

  When the power supply voltage Vin is equal to or lower than the threshold voltage, the overvoltage detection element 31 is turned off to cut off the current. The threshold voltage is defined by the breakdown voltage of the overvoltage detection element 31. For example, when the breakdown voltage of the overvoltage detection element 31 is 34V, the threshold voltage is 34V, which is the same as the breakdown voltage of the overvoltage detection element 31. When the power supply voltage Vin is equal to or lower than the threshold voltage, the overvoltage detecting element 31 cuts off the current, so that the base current does not flow through the control switch 45 and the control switch 45 is turned off. When the power supply voltage Vin is equal to or lower than the threshold voltage, the control switch 45 is turned off. Therefore, a voltage corresponding to the maximum amplitude of the power supply voltage Vin applied from the power supply 100 is applied to the gate of the switch 14, and the switch 14 is turned on. .

  When the power supply voltage Vin becomes higher than the threshold voltage, the overvoltage detection element 31 is turned on, and a current flows from the output terminal of the second rectifier circuit 15 toward the ground. When the power supply voltage Vin becomes higher than the threshold voltage, a current flows from the output terminal of the second rectifier circuit 15 toward the ground, so that a base current flows in the control switch 45 and the control switch 45 is turned on. . When the power supply voltage Vin becomes higher than the threshold voltage, the control switch 45 is turned on, so that the gate voltage of the switch 14 becomes substantially equal to the source voltage of the switch 14 and the switch 14 is turned off.

  FIG. 3 is a timing chart for explaining the operation of the power supply device 1. In FIG. 3, a waveform 301 indicates the power supply voltage Vin input from the power supply 100, a waveform 302 indicates the gate voltage Vg of the switch 14, and a waveform 303 indicates the power supply side voltage Vc of the capacitor 13. A waveform 304 indicates the base voltage Vb of the control switch 45, and a waveform 305 indicates the input voltage Vr of the first rectifier circuit 11.

  Since the overvoltage detection element 31 is normally turned off when a 24V AC voltage is input from the power supply 100, the base switch does not flow and the control switch 45 is turned off. Since the control switch 45 is turned off, the gate voltage Vg of the switch 14 is increased according to the charging of the control capacitor 47, and the switch 14 is turned on. When the switch 14 is turned on, the capacitor 13 is charged, an exciting current flows through the pair of coils 21a and 21b of the relay 10, and the relay 10 is turned on, whereby the input voltage Vr to the first rectifier circuit 11 is turned on. Is started.

  At the time of an overvoltage input in which a 100 V AC voltage is input from the power supply 100, the overvoltage detection element 31 is turned on, a base voltage flows, and the control switch 45 is turned on. Since the control switch 45 is turned on, the control capacitor 47 is not charged, the gate voltage Vg of the switch 14 does not increase, and the switch 14 remains off. Since the switch 14 remains in the off state, the capacitor 13 is not charged, the exciting current does not flow through the pair of coils 21a and 21b of the relay 10, and the relay 10 maintains the off state. The voltage Vr is not applied.

  When the voltage changes from the normal time when the 24V AC voltage is input to the overvoltage input when the 100V AC voltage is input, each of the overvoltage detection elements 31 is turned on, the base voltage flows, and the control switch 45 is turned on. Since the control switch 45 is turned on, the control capacitor 47 is discharged, the gate voltage Vg of the switch 14 is lowered, and the switch 14 is turned off. Since the switch 14 is turned off, the capacitor 13 is not charged, the supply of the excitation current to the pair of coils 21a and 21b of the relay 10 is stopped, the relay 10 is turned off, and the input voltage to the first rectifier circuit 11 The application of Vr is stopped.

  In the power supply device according to the first embodiment, the capacitor that supplies the exciting current to the coil of the relay for preventing high voltage application is not charged when overvoltage is applied, and there is no possibility that a high voltage higher than the rated voltage is applied. It is not necessary to use a withstand voltage electrolytic capacitor. Since the power supply device according to the first embodiment can employ a capacitor having a capacity suitable for supplying the excitation current to the relay coil as the excitation current supply capacitor, the excitation current supply capacitor determines the life of the power supply device. There is little risk of being a factor.

  Further, in the power supply device according to the first embodiment, the exciting current supply capacitor is not used together with the smoothing capacitor, so that a small-capacitance electrolytic capacitor is connected in parallel to the relay coil and used for quick charging at startup. Thus, the power supply voltage can be stably applied at the time of startup.

  In the power supply device according to the first embodiment, since the switch is connected in series to the relay coil together with the capacitor, the relay is turned off when the overvoltage is applied, and the overvoltage is applied to the rectifier circuit and the DCDC converter circuit. Can be prevented. In the power supply device according to the first embodiment, it is possible to prevent an overvoltage from being applied to the rectifier circuit and the DCDC converter circuit, so that the components of the rectifier circuit and the DCDC converter circuit are destroyed by the application of the overvoltage. Can be prevented.

  In the power supply device according to the first embodiment, since the switch is an nMOSFET and the control switch is an npn transistor, a capacitor charge / discharge circuit can be realized with a simple configuration.

  In the power supply device according to the first embodiment, since one end of the capacitor is connected to the control switch connected to the gate of the switch, the capacitor is detected to have a power supply voltage higher than the threshold voltage. The battery can be discharged quickly through the control switch.

  FIG. 4 is a circuit block diagram of the power supply device according to the second embodiment.

  The power supply device 2 is different from the power supply device 1 in the connection relationship between the capacitor 13 and the switch 14. The configuration and function of the constituent elements of the power supply device 2 other than the connection relationship between the capacitor 13 and the switch 14 are the same as the configuration and functions of the constituent elements of the power supply device 1 denoted by the same reference numerals. Is omitted.

  One end of the switch 14 is connected to the power supply terminal 18, and the other end of the switch 14 is connected to one end of the capacitor 13 and the pair of coils 21 a and 21 b of the relay 10. The other end of the capacitor 13 is grounded.

  FIG. 5 is a circuit block diagram of the power supply device according to the third embodiment.

  The power supply device 3 is different from the power supply device 1 in that it has an overvoltage alarm terminal 51. Since the configuration and function of the power supply device 3 other than the overvoltage alarm terminal 51 are the same as the configuration and function of the power supply device 1 with the same reference numerals, detailed description thereof is omitted here.

  FIG. 6 is a more detailed circuit block diagram showing an application example of the power supply device 3.

  The overvoltage alarm terminal 51 is connected to the other end of the first overvoltage resistance element 32, the second overvoltage resistance element 33, and one end of the overvoltage capacitor 35, and is connected to the anode of the LED 52. The cathode of the LED 52 is grounded.

  When the power supply voltage Vin becomes higher than the threshold voltage, the overvoltage detection element 31 is turned on, a current flows to the LED 52 via the overvoltage alarm terminal 51, and the LED 52 emits light. The LED 52 emits light when the power supply voltage Vin becomes higher than the threshold voltage, so that the operator who applied the power supply voltage to the power supply device 3 receives 100V AC voltage instead of 24V AC voltage. It can be perceived as being applied.

  The power supply device according to the above embodiment or modification may be mounted on a gaming machine such as a ball game machine or a spinning game machine.

  FIG. 7 is an arrangement view of the ball game machine 6 in the game facility, FIG. 8 is a schematic perspective view of the ball game machine 6 provided with the power supply device according to the above-described embodiment or modification, and FIG. It is a schematic rear view of the gaming machine 6. As shown in FIG. 7, a plurality of ball game machines 6 are arranged with a ball supply device 7 that supplies the ball to the ball game machine 6. As shown in FIG. 8, the ball game machine 6 is provided in a large area from the upper part to the center part, and a game board 61 that is a game machine main body and a ball that is arranged below the game board 61. It has a receiving portion 62, an operating portion 63 having a handle, and a display device 64 provided in the approximate center of the game board 61. The ball receiving unit 62 is supplied with a ball from the adjacent ball supply device 7.

  The ball game machine 6 also has a fixed accessory part 65 disposed below the game board 61 on the front surface of the game board 61 for the purpose of playing the game. A rail 67 is provided on the side of the game board 61. On the game board 61, a number of obstacle nails (not shown) and at least one winning device 68 are provided.

  The operation unit 63 launches a game ball with a predetermined force from a launching device (not shown) according to the turning amount of the handle by the player's operation. The launched game ball moves upward along the rail 67 and falls between a number of obstacle nails. When it is detected by a sensor (not shown) that a game ball has entered any winning device 68, the main control circuit 70 provided on the back of the game board 61 determines a predetermined value corresponding to the winning device 68 containing the game ball. The game balls are paid out to the ball receiving portion 62 via a ball payout device (not shown). Further, the main control circuit 70 displays various images on the display device 64 via the effect control circuit 71 provided on the back of the game board 61.

  The power supply device 73 according to the above-described embodiment or its modification is a gaming machine that operates using supplied power, such as the main control circuit 70, the production control circuit 71, the display device 64, the launching device, and the ball dispensing device. Power is supplied to each load circuit.

  As described above, those skilled in the art can make various modifications in accordance with the embodiment to be implemented within the scope of the present invention. For example, in the power supply apparatus described, the relay 10 includes a pair of contacts 20a and 20b and a pair of coils 21a and 21b. However, in the power supply apparatus according to the embodiment, the relay includes a single contact and an excitation current. A single coil that turns on a single contact when the current flows may be transferred.

1-3, 73 Power supply device 6 Ball game machine (game machine)
DESCRIPTION OF SYMBOLS 10 Relay 13 Capacitor 14 Switch 16 Overvoltage detection circuit 17 Switch control circuit 20a, 20b Contact 21a, 21b Coil

Claims (3)

It is arranged between a power supply terminal connected to a power supply and a load terminal connected to a load, opens between the power supply terminal and the load terminal when turned off, and turns on the power supply terminal and the load when turned on. A relay having a contact connecting between the terminal and a coil that turns off the contact when excitation current is not supplied and turns on the contact when excitation current is supplied;
A capacitor having one end connected to the power supply terminal and connected in parallel to the coil;
A switch connected in series to the capacitor;
An overvoltage detection circuit for detecting that a power supply voltage applied to the power supply terminal is higher than a predetermined threshold voltage;
When the overvoltage detection circuit does not detect that the power supply voltage is higher than the threshold voltage, the switch is turned on, the power supply voltage is applied to the capacitor, and the exciting current is supplied to the coil of the relay. The contact is turned on and turned off when the overvoltage detection circuit detects that the power supply voltage is higher than the threshold voltage, and the application of the power supply voltage to the capacitor is stopped to A switch control circuit that stops supplying the exciting current to the coil and turns off the contact;
A power supply device comprising: The switch is connected in series to the coil along with the capacitor,
2. The power supply device according to claim 1, wherein a power supply voltage is applied to the coil of the relay together with the capacitor when the switch is turned on, and application of a power supply voltage is stopped together with the capacitor when the switch is turned off. . A load circuit;
A power supply device for supplying power to the load circuit,
It is arranged between a power supply terminal connected to a power supply and a load terminal connected to a load, and when turned off, opens between the power supply terminal and the load terminal, and when turned on, A relay having a contact for connecting between the load terminal and a coil for turning off the contact when excitation current is not supplied and turning on the contact when excitation current is supplied;
A capacitor having one end connected to the power supply terminal and connected in parallel to the coil;
A switch connected in series to the capacitor;
An overvoltage detection circuit for detecting that a power supply voltage applied to the power supply terminal is higher than a predetermined threshold voltage;
When the overvoltage detection circuit does not detect that the power supply voltage is higher than the threshold voltage, the switch is turned on, the power supply voltage is applied to the capacitor, and the exciting current is supplied to the coil of the relay. The contact is turned on and turned off when the overvoltage detection circuit detects that the power supply voltage is higher than the threshold voltage, and the application of the power supply voltage to the capacitor is stopped to A switch control circuit that stops supplying the exciting current of the coil and turns off the contact, and a power supply device,
A gaming machine characterized by comprising:

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