JP2017005949A - Power supply circuit and game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a relatively small overcurrent caused by a layer short etc.SOLUTION: A power supply circuit 1 includes: a rectifier circuit 12; a switching circuit 15 which, at an ON state, connects between the rectifier circuit 12 and a load circuit 91, whereas at an OFF state, at the time of OFF state cuts off the connection between the rectifier circuit 12 and the load circuit 91; a load current detection circuit 14 which detects a load current; a first comparison circuit 16 which outputs a first overcurrent signal when a load current is a first threshold or greater; a second comparison circuit 17 which, outputs a second overcurrent signal if the load current is equal to or greater than a second threshold which is smaller than the first threshold, before the lapse of an activation time after an AC is input to the rectifier circuit 12; and an overcurrent control circuit 18 connected to the first comparison circuit 16 and the second comparison circuit 17, and according to the input of the first overcurrent signal and the continuous input of the second overcurrent signal for a duration time, switching a switching circuit to an OFF state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply circuit and a gaming machine using such a power supply circuit.

  In the gaming machine, a power supply circuit that monitors the load current supplied to the load circuit, determines that an overcurrent has flowed when the load current is equal to or greater than a predetermined detection value, and stops supplying the current to the load circuit. It is known (see, for example, Patent Document 1).

  Patent Document 1 describes a power supply circuit capable of setting two stages of overcurrent detection values, a first overcurrent detection value and a second overcurrent detection value larger than the first overcurrent detection value. The power supply circuit described in Patent Document 1 detects an overcurrent based on a first overcurrent detection value when an elapsed time after power-on exceeds a predetermined time and an output voltage supplied to a load is equal to or higher than a predetermined voltage. I do. In addition, the power supply circuit described in Patent Document 1 is equal to or greater than the maximum value of the inrush current (also referred to as a rush current) at the time of power-on at the time of start-up before the elapsed time after power-on exceeds a predetermined time. Overcurrent detection is performed using the second overcurrent detection value, which is a relatively large detection value. In the power supply circuit described in Patent Document 1, it is possible to prevent the overcurrent detection function from malfunctioning due to the inrush current by setting the second overcurrent detection value to be equal to or greater than the maximum value of the inrush current at the time of starting the power supply. .

JP 2005-323413 A

  However, in the power supply circuit described in Patent Document 1, a relatively small overcurrent such as an overcurrent caused by a short circuit (hereinafter also referred to as a rare short) caused by dust or the like entering the game machine and adhering to the electrical wiring. It is not easy to detect. In the power supply circuit described in Patent Document 1, the overcurrent detection value at the time of startup is relatively large, which is greater than or equal to the maximum value of the inrush current at the time of power supply startup. Can not. Further, if the overcurrent detection value during normal operation is made small in order to make it possible to detect overcurrent due to a rare short, the overcurrent detection function may malfunction due to current fluctuation due to steady operation of the gaming machine. For this reason, the power supply circuit described in Patent Document 1 cannot detect an overcurrent caused by a rare short even during steady operation of the gaming machine.

  Accordingly, an object of the present invention is to provide a power supply circuit capable of detecting a relatively small overcurrent caused by a rare short or the like.

  In order to achieve the above object, a power supply circuit according to one aspect of the present invention is a power supply circuit that supplies power to a load circuit provided in a gaming machine, and rectifies the input alternating current into direct current. A switching circuit that connects between the rectifier circuit and the load circuit when the circuit is on, and disconnects the connection between the rectifier circuit and the load circuit when the circuit is off, and when the switching circuit is on A load current detection circuit that detects a load current flowing from the rectifier circuit to the load circuit, and a first comparison circuit that is connected to the load current detection circuit and outputs a first overcurrent signal when the load current is equal to or greater than a first threshold value. And when the load current is greater than or equal to a second threshold value smaller than the first threshold value after the predetermined start-up time elapses after AC is input to the rectifier circuit. Output overcurrent signal Connected to the second comparison circuit, the first comparison circuit, and the second comparison circuit, the first overcurrent signal is input, or the second overcurrent signal is continuously input for a predetermined duration. And an overcurrent control circuit that turns off the switching circuit.

  Further, in this power supply circuit, the overcurrent control circuit is connected to the first comparison circuit and the second comparison circuit, and the duration measuring circuit counts the time during which the input of the first overcurrent signal or the second overcurrent signal continues. And a switch control circuit that is connected to the duration time counting circuit and outputs an off instruction signal to the switching circuit indicating that the duration time is reached when the time counted by the duration time counting circuit reaches the duration time. It is preferable.

  Further, in the power supply circuit, the first comparison circuit changes a first threshold voltage corresponding to the first threshold in response to input of a load prediction signal for predicting a change in load current; It is preferable to have a first comparator that compares the detection voltage corresponding to the load current with the first threshold voltage and outputs a first overcurrent signal when the load current is equal to or higher than the first threshold voltage.

  Further, in this power supply circuit, the second comparison circuit compares the detection voltage corresponding to the load current with the second threshold voltage corresponding to the second threshold, and when the detection voltage is equal to or higher than the second threshold voltage, the second comparison circuit. A second comparator for outputting a current signal, a time for measuring the time since AC is input to the rectifier circuit, and a start-up time counting circuit for outputting a start-up time lapse signal when the measured time has passed the start-up time; The second overcurrent signal is output when the second overcurrent signal is input before the startup time elapsed signal is input, and the second overcurrent signal is output and the startup time elapsed signal is input. And a disabling circuit that does not output the second overcurrent signal when the second overcurrent signal is input.

  Furthermore, according to another embodiment of the present invention, the gaming machine is a load circuit, a power supply circuit that supplies power to the load circuit, a rectifier circuit that converts input alternating current into direct current, an on-state A switching circuit that sometimes connects between the rectifier circuit and the load circuit, and disconnects the connection between the rectifier circuit and the load circuit when in the off state, and from the rectifier circuit to the load circuit when the switching circuit is in the on state. A load current detection circuit for detecting a flowing load current; a first comparison circuit that is connected to the load current detection circuit and outputs a first overcurrent signal when the load current is equal to or greater than a first threshold; and a load current detection circuit The second overcurrent signal is output when the load current is equal to or greater than a second threshold value that is smaller than the first threshold value after a predetermined start-up time elapses after AC is input to the rectifier circuit. Second comparison circuit and first ratio The switching circuit is turned off in response to the input of the first overcurrent signal or the continuous input of the second overcurrent signal for a predetermined duration. And an overcurrent control circuit for bringing the power supply circuit into a state.

  The gaming machine further includes an effect control circuit that outputs a load prediction signal for predicting a change in load current according to the effect, and the first comparison circuit responds to the input of the load prediction signal. The threshold value changing circuit for changing the first threshold voltage corresponding to the first threshold value is compared with the detection voltage corresponding to the load current and the first threshold voltage. When the load current is equal to or higher than the first threshold voltage, And a first comparator that outputs a current signal.

  The power supply circuit according to the present invention has an effect that it is possible to detect a relatively small overcurrent due to a rare short circuit or the like.

1 is a circuit block diagram of a power supply circuit according to a first embodiment. 2 is a timing chart showing the operation of the power supply circuit shown in FIG. 1, (a) is a diagram showing a state where an overcurrent due to a rare short does not flow, and (b) is an overcurrent caused by a rare short at startup. It is a figure which shows the state which flows, (c) is a figure which shows the state through which the overcurrent resulting from a rare short circuit flows at the time of steady operation of a game machine. It is a circuit block diagram of the power supply circuit which concerns on 2nd Embodiment. It is an internal circuit block diagram of the threshold value changing circuit 51 shown in FIG. 4 is a timing chart showing the operation of the power supply circuit shown in FIG. 3. It is a schematic perspective view of the ball game machine provided with the power supply circuit which concerns on embodiment or a modification. FIG. 7 is a schematic rear view of the ball game machine shown in FIG. 6.

(Outline of power supply circuit according to the present invention)
Hereinafter, a power supply circuit according to an embodiment of the present invention will be described with reference to the drawings. The power supply circuit compares a load current flowing through the load circuit with a first threshold and a second threshold that is smaller than the first threshold used only at the time of start-up. When the state of two thresholds or more continues for a predetermined duration, the load current is cut off. Although this power supply circuit uses a relatively small second threshold value for overcurrent detection at startup, the power supply circuit cuts off the load current when a state where the load current is equal to or greater than the second threshold value continues for a predetermined duration. Therefore, there is no possibility of malfunction due to an inrush current at the time of startup that flows instantaneously. In this power supply circuit, it is possible to determine whether or not the load current includes an overcurrent by using the second threshold value at the time of start-up when the magnitude and fluctuation of the load current are small. Can be detected.

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

  The power supply circuit 1 includes a switch 11, a rectifier circuit 12, a smoothing capacitor 13, a load current detection circuit 14, a switching circuit 15, a first comparison circuit 16, a second comparison circuit 17, and an overcurrent control circuit. 18. The power supply circuit 1 converts alternating current input from the commercial power supply 90 into direct current, and supplies the converted direct current to the load circuit 91. The load circuit 91 is provided in the gaming machine, and various electric circuits and electronic devices including an effect control circuit 92 that performs various effects by controlling a display device (not shown) by the power supplied from the power supply circuit 1. Etc.

The switch 11 is an electromagnetic switch in one example, and turns on and off the electrical connection between the commercial power supply 90 connected at one end and the rectifier circuit 12 connected at the other end. When the switch 11 is turned on, it supplies alternating current from the commercial power supply 90 to the rectifier circuit 12 and the like. When the switch 11 is opened, it stops supplying AC from the commercial power supply 90 to the rectifier circuit 12 and the like. The rectifier circuit 12 rectifies the alternating current input from the commercial power supply 90 and outputs it to the smoothing circuit 4. The rectifier circuit 12 is a bridge rectifier circuit in one example, and a full-wave synchronous rectifier circuit in another example. The smoothing capacitor 13 smoothes the current input from the rectifier circuit 12 and supplies the load current _IL to the load circuit 91.

The load current detection circuit 14 includes a detection resistance element 19 and an amplification circuit 20 and is disposed between the smoothing capacitor 13 and the load circuit 91. The detection resistance element 19 is connected between the smoothing capacitor 13 and the load circuit 91, and outputs a voltage corresponding to the load current I _L flowing from the rectifier circuit 12 to the load circuit 91 through the smoothing capacitor 13 to the amplifier circuit 20. . The amplifier circuit 20 is also referred to as a current detection amplifier or a current sense amplifier, and outputs a detection voltage V _D obtained by amplifying the voltage input from the detection resistance element 19 to the first comparison circuit 16 and the second comparison circuit 17. For example, the amplifier circuit 20 is a differential amplification type operational amplifier.

In one example, the load current detection circuit 14 outputs a detection voltage V _{D of} 1 V when the load current I _L is 1 A. Therefore, when the load current I _L is 2 A, the detection voltage V _D is 2 V, and when the load current I _L is 10 A, the detection voltage V _D is 10 V.

  The switching circuit 15 is arranged between the rectifier circuit 12 and the load circuit 91, connects between the rectifier circuit 12 and the load circuit 91 when in the on state, and rectifies circuit 12 and the load circuit 91 when in the off state. Block the connection between In one example, the switching circuit 15 has a source connected to the rectifier circuit 12, a drain connected to the load circuit 91, and a gate connected to the overcurrent control circuit 18, and is turned on in response to a signal from the overcurrent control circuit 18. It includes an nMOSFET that switches between off states. In another example, the switching circuit 15 includes a relay that switches between an on state and an off state in response to a signal from the overcurrent control circuit 18. The switching circuit 15 is turned on when an ON instruction signal that is a “Hi” signal is input from the overcurrent control circuit 18, and an OFF instruction signal that is a “Low” signal is input from the overcurrent control circuit 18. Then it turns off.

The first comparison circuit 16 includes a first comparator 21 and a first diode 22, and compares the detection voltage V _D corresponding to the load current I _L with the first threshold voltage V _TH1 to detect the detection voltage V _D. Is over the first threshold voltage V _TH1 , the first overcurrent signal is output. The first comparator 21 receives the detection voltage V _D corresponding to the load current I _L from the amplifier circuit 20 at one input terminal and the first threshold voltage V _TH1 at the other input terminal. In one example, the first threshold voltage V _TH1 is generated by a constant voltage source such as an emitter follower circuit. When the detection voltage V _D is lower than the first threshold voltage V _TH1 , a “Low” signal is output from the output terminal of the first comparator 21, and when the detection voltage V _D is equal to or higher than the first threshold voltage V _TH1. The first overcurrent signal which is a “Hi” signal is output. The first diode 22 has an anode connected to the output terminal of the first comparator 21 and outputs a signal output from the output terminal of the first comparator 21 from the cathode.

The second comparison circuit 17 includes a second comparator 31, a start timing circuit 32, an output invalid circuit 33, and a second diode 34. The second comparison circuit 17 compares the detection voltage V _D corresponding to the load current I _L with the second threshold voltage V _TH2 lower than the first threshold voltage V _TH1 and starts the power supply circuit 1 for a predetermined activation. When the detection voltage V _D is equal to or higher than the second threshold voltage V _TH2 during the elapse of time, the second overcurrent signal is output.

In the second comparator 31, the detection voltage V _D corresponding to the load current I _L is input from the amplifier circuit 20 to one input terminal, and the second threshold voltage V _TH2 is input to the other input terminal. The second threshold voltage V _TH2, a voltage lower than the first threshold voltage V _TH1, in one example generated by the constant voltage source of the emitter follower circuit and the like similarly to the first threshold voltage V _TH1. When the detection voltage V _D is lower than the second threshold voltage V _TH2 , a “Low” signal is output from the output terminal of the second comparator 31, and when the detection voltage V _D is equal to or higher than the second threshold voltage V _TH2. A second overcurrent signal that is a “Hi” signal is output.

  The start timing circuit 32 has a time constant circuit such as an RC circuit, for example, and is connected to the switch 11. When the switch 11 is turned on and AC is input from the commercial power supply 90 via the switch 11, the start-up timing circuit 32 starts a timing operation. The start-up timing circuit 32 measures the time from when the commercial power supply 90 and the rectifier circuit 12 are connected by starting a timing operation in response to an AC input. The start timing circuit 32 is a start time elapse signal indicating that a predetermined start time has elapsed when a predetermined start time has elapsed since the commercial power supply 90 and the rectifier circuit 12 are connected. Is output to the output invalid circuit 33. The start-up time is 2 seconds in one example. The output invalid circuit 33 outputs a signal output from the output terminal of the second comparator 31 to the anode of the second diode 34 when the start time lapse signal is not input from the start timing circuit 32. The output invalid circuit 33 outputs a “Low” signal to the second diode 34 regardless of the signal output from the output terminal of the second comparator 31 when the activation time lapse signal is input from the activation timing circuit 32. Output to the anode. In one example, the output invalid circuit 33 is an FET whose gate is connected to the output terminal of the start timing circuit 32, whose source is grounded, and whose drain is connected to the output terminal of the second comparator 31 and the anode of the second diode 34. The second diode 34 has an anode connected to the output terminals of the second comparator 31 and the output invalid circuit 33, and outputs a signal output from the output terminal of the first comparator 21 from the cathode.

The output terminal of the first comparator 21 and the output terminal of the second comparator 31 are connected together to the input terminal of the overcurrent control circuit 18 via the first diode 22 and the second diode 34, respectively. When the detection voltage V _D is lower than the first threshold voltage V _{TH1 and} higher than the second threshold voltage V _TH2 , the first comparator 21 outputs a “Low” signal, and the second comparator 31 outputs a “Hi” signal. Is output. Since the first diode 22 is reverse-biased and the forward current is cut off, the potential on the anode side of the first diode 22 becomes “Low” and the potential on the cathode side becomes “Hi”. Therefore, the overcurrent control circuit 18 The “Hi” signal is input to the input terminal of. Similarly, when the potential on the anode side of the second diode 34 becomes “Low” and the first comparator 21 outputs a signal “Hi” that is the first overcurrent signal, the second diode 34 becomes reverse biased and becomes excessive. A signal “Hi” is input to the input terminal of the current control circuit 18.

The overcurrent control circuit 18 includes a duration measuring circuit 41, a latch circuit 42, a switch control circuit 43, and a light emitting circuit 44. The duration time counting circuit 41 has a time constant circuit such as an RC circuit in one example, and calculates the time from when either the first overcurrent signal or the second overcurrent signal, which is a “Hi” signal, is input. Time is counted and a trigger signal is output to the latch circuit 42 when a predetermined duration has elapsed. The predetermined duration is, for example, 100 milliseconds, but may be longer than the time during which the detection voltage V _D corresponding to the load current I _L is equal to or higher than the second threshold voltage V _TH2 when an inrush current flows during startup. That is, the predetermined duration may be longer than the load current I size is not smaller than the second threshold value corresponding to the second threshold voltage V _TH2 time _L when rush current flows.

  For example, the latch circuit 42 is a flip-flop in which a “Hi” signal is input to the D terminal and a trigger signal is input to the CK terminal. The latch circuit 42 outputs a “Low” signal to the switch control circuit 43 and the light emitting circuit 44 when AC is input to the rectifier circuit 12, and continues to output the “Low” signal until a trigger signal is input. . Further, the latch circuit 42 changes the output signal from “Low” to “Hi” when the trigger signal is input, and then continues to output the “Hi” signal until no AC is input to the rectifier circuit 12. .

  The switch control circuit 43 is connected to the switch 11 and the latch circuit 42. When the AC is input from the commercial power supply 90 via the switch 11 and the “Low” signal is input from the latch circuit 42, the switch control circuit 43 outputs an ON instruction signal that is a “Hi” signal to the switching circuit 15. Output to. Further, the switch control circuit 43 outputs an OFF instruction signal, which is a “Low” signal, to the switching circuit 15 when an alternating current is input from the commercial power supply 90 and a “Hi” signal is input from the latch circuit 42.

Emitting circuit 44 includes an LED element in one example, by emitting a signal of "Hi" is input from the latch circuit 42, that the load current I _L is likely to include over-current caused by the short circuit not Display to the operator shown.

(Operation of the power supply circuit according to the first embodiment)
FIG. 2 is a timing chart showing the operation of the power supply circuit 1. FIG. 2A is a diagram showing a state where an overcurrent caused by a rare short does not flow, and FIG. 2B is a diagram showing a state where an overcurrent caused by a rare short flows during startup, and FIG. c) is a diagram showing a state in which an overcurrent caused by a short-circuit flows during a steady operation of the gaming machine. In FIG. 2 (a) ~2 (c) , the horizontal axis represents an elapsed time, the vertical axis represents the load current I _L. Further, in FIG. 2 (a) ~2 (c) , each of the one-dot chain line and two-dot chain line, the switching circuit 15 power supply circuit 1 is determined to include an overcurrent load current I _L caused by the short circuit Indicates the threshold value for turning off. Dashed line represents the first threshold value when the detection voltage V _D corresponding to the load current I _L exceeds the first threshold voltage V _TH1, the two-dot chain line detection voltage V _D is a second threshold value corresponding to the load current I _L The second threshold value when the voltage V _TH2 is exceeded is shown. Waveform 201 to 203, shows an example of the load current I _L of each state.

  First, with reference to FIG. 2A, a state in which an overcurrent caused by a rare short or the like does not flow will be described. In the state shown in FIG. 2A, a rare short circuit does not occur in the load circuit 91 during the steady operation of the gaming machine after the power supply circuit 1 is activated.

When the switch 11 is turned on, a relatively a large current inrush current flows from the rectifier circuit 12 of the power supply circuit 1 over a time t ₁₁ to the load circuit 91. When the switch 11 is turned on, the start-up timing circuit 32 starts a timing operation. When the detection voltage V _D indicated by the two-dot chain line exceeds the threshold value indicating that the load current I _L exceeds the second threshold voltage V _TH2 due to the inrush current, the second comparator 31 outputs a second signal that is a “Hi” signal. The overcurrent signal is output to the duration measuring circuit 41 via the second diode 34. When the second overcurrent signal is input, the duration time counting circuit 41 starts a time counting operation. However, the time when the inrush current indicated by t ₁₂ exceeds the threshold is sufficiently shorter than the time measured by the time counting circuit 41, which is 100 milliseconds as an example, so that the time counting circuit 41 counts the time until the time elapses. Before the detection, the detection voltage V _D becomes lower than the second threshold voltage V _TH2 . When the detection voltage V _D becomes lower than the second threshold voltage V _TH2 , the second comparator 31 stops outputting the second overcurrent signal, so the duration time counting circuit 41 ends the time counting.

When the activation time switch 11 are shown in t ₁₃ after being turned elapses, start counting circuit 32 outputs a start time signal to output disable circuit 33, the output disable circuit 33 a signal "Low" second Output to the anode of the diode 34. When the output invalid circuit 33 outputs a “Low” signal to the anode of the second diode 34, the second comparison circuit 17 causes the anode of the second diode 34 to be independent of the detection voltage V _D corresponding to the load current I _L. Is fixed at “Low”. Even when the detection voltage V _D corresponding to the load current I _L becomes equal to or higher than the second threshold voltage V _TH2 by fixing the anode voltage of the second diode 34 to “Low”, the second comparison circuit 17 The second overcurrent signal is not output. Therefore, the threshold value of the load current I _L increases to a current corresponding to the first threshold value indicated by the alternate long and short dash line.

to the load circuit 91 with time represented by t ₁₄ starts operation control of the gaming machine, the load circuit 91 consumes little power, the load current I _L is relatively as indicated by arrow A The load current I _{L is} small and the fluctuation is small. When the load circuit 91 with time represented by t ₁₄ starts operation control of the gaming machine, the load current I _L, it becomes larger than the consumption current during start indicated by the arrow A, the load current I _L Fluctuations also increase.

  Next, with reference to FIG. 2 (b), a state in which an overcurrent caused by a rare short flows at the time of startup will be described. In the state shown in FIG. 2B, a rare short has occurred in any of the load circuits 91 before the switch 11 is turned on.

When the switch 11 is turned on, an inrush current flows from the rectifier circuit 12 of the power supply circuit 1 to the load circuit 91. Since the inrush current at this time includes an overcurrent caused by a rare short, it becomes larger than the inrush current in the state shown in FIG. When the switch 11 is turned on, the start-up timing circuit 32 starts a timing operation. Next, when the detection voltage V _D indicated by the two-dot chain line becomes equal to or higher than the threshold value indicating that the load current I _L is the second threshold voltage V _TH2 due to the inrush current, the second comparator 31 is a “Hi” signal. The second overcurrent signal is output to the duration measuring circuit 41 via the second diode 34. When the second overcurrent signal is input, the duration time counting circuit 41 starts a time counting operation.

From switch 11 is turned on, even when no inrush current flows are passed the time represented by t _21, the load current I _L, to include an overcurrent due to short circuit, indicated by the two-dot chain line Be over threshold. Because the load current I _L is equal to or greater than the threshold indicated by the two-dot chain line, the second comparator 31 continues to output to the continuation time measuring circuit 41 of the second over-current signal, the duration time counting circuit 41 continues the time measurement .

The continuation time counting circuit 41 outputs a trigger signal to the latch circuit 42 when measuring the duration of time indicated by t ₂₂ . When the trigger signal is input, the latch circuit 42 transitions the signal output to the switch control circuit 43 and the light emitting circuit 44 from “Low” to “Hi”. When an AC is input from the commercial power supply 90 and a “Hi” signal is input from the latch circuit 42, the switch control circuit 43 outputs an OFF instruction signal that is a “Low” signal to the switching circuit 15. The switching circuit 15 is turned off when the off instruction signal is input, and disconnects the connection between the rectifier circuit 12 and the load circuit 91. When the switching circuit 15 disconnects the connection between the rectifier circuit 12 and the load circuit 91, the load current _IL does not flow.

  Next, with reference to FIG. 2 (c), a state in which an overcurrent caused by a rare short flows during a steady operation of the gaming machine will be described. In the state shown in FIG. 2C, a rare short occurs in any of the load circuits 91 during the steady operation of the gaming machine.

The operation from when the switch 11 is turned on until the gaming machine starts a steady operation is the same as the operation described with reference to FIG. That is, t ₃₁ to t ₃₄ in FIG. 2C correspond to t ₁₁ to t ₁₄ in FIG. Since the operation from when the switch 11 is turned on until the gaming machine starts a steady operation has been described with reference to FIG. 2 (a), detailed description is omitted here.

When a rare short occurs at the time indicated by the arrow B, the detection voltage V _D indicated by the one-dot chain line indicates that the load current I _L is the first threshold voltage V _TH1 by including an overcurrent caused by the rare short. It becomes more than the 1st threshold shown. When the detection voltage V _D becomes equal to or higher than the first threshold voltage V _TH1 , the first comparator 21 outputs a first overcurrent signal, which is a “Hi” signal, to the duration timer circuit 41 via the first diode 22. . When the second overcurrent signal is input, the duration time counting circuit 41 starts a time counting operation.

Continuation time measuring circuit 41, the counts over the duration represented by t _35, and outputs a trigger signal to the latch circuit 42. When the trigger signal is input, the latch circuit 42 transitions the signal output to the switch control circuit 43 and the light emitting circuit 44 from “Low” to “Hi”. When an AC is input from the commercial power supply 90 and a “Hi” signal is input from the latch circuit 42, the switch control circuit 43 outputs an OFF instruction signal that is a “Low” signal to the switching circuit 15. The switching circuit 15 is turned off when the off instruction signal is input, and disconnects the connection between the rectifier circuit 12 and the load circuit 91. When the switching circuit 15 disconnects the connection between the rectifier circuit 12 and the load circuit 91, the load current _IL does not flow.

(Operational effect of the power supply circuit according to the first embodiment)
The power supply circuit according to the first embodiment stops the supply of the load current to the load circuit when it is detected that the input is continuously input for a duration longer than the time during which the inrush current flows during startup. There is no risk of stopping the supply of load current due to the inrush current. Since the power supply circuit according to the first embodiment has no fear of stopping the supply of the load current due to the inrush current, it is determined whether or not the load current is normal at start-up when the magnitude and fluctuation of the load current are relatively small. be able to. Since the power supply circuit according to the first embodiment can determine whether or not the load current is normal at the start-up when the magnitude and fluctuation of the load current are relatively small, comparison of overcurrent caused by a rare short-circuit is performed. A small abnormal current can be detected.

  For example, in the power supply circuit according to the first embodiment, when the load current at start-up is less than 1 A and the load current at steady operation is about 10 A, the second threshold voltage at start-up is a load current of 1 A or more. It can be set to a detectable value. As a result, when the load current flows at 1 A or more at startup, it can be determined that the current is abnormal and the supply of the load current to the load circuit can be stopped. Can prevent ignition.

(Configuration of Power Supply Circuit According to Second Embodiment)
FIG. 3 is a circuit block diagram of a power supply circuit according to the second embodiment.

  The power supply circuit 2 according to the second embodiment is different from the power supply circuit 1 according to the first embodiment in that a first comparison circuit 50 including a threshold value changing circuit 51 is arranged instead of the first comparison circuit 16. The constituent elements of the power supply circuit 2 other than the first comparison circuit 50 have the same configuration and function as the constituent elements of the power supply circuit 1 according to the first embodiment given the same reference numerals, and thus detailed description thereof is omitted here. To do.

  FIG. 4 is an internal circuit block diagram of the threshold value changing circuit 51.

The threshold value changing circuit 51 includes an input terminal 52, an output terminal 53, a switching transistor 54, a first resistance element 55, a second resistance element 56, and a third resistance element 57. The threshold change circuit 51 changes the value of the first threshold voltage V _TH1 output from the output terminal 53 to the first comparator 21 in accordance with the state determination signal input from the production control circuit 92 to the input terminal 52. Can do.

The effect control circuit 92 outputs two state determination signals, a first state determination signal and a second state determination signal, to the threshold value changing circuit 51. The effect control circuit 92 outputs a first state determination signal when the game ball is not in the winning opening and is in a non-winning state, and the game ball wins the winning opening and wins a lottery. A second state determination signal is output in a winning state in which different special effects are executed. Load current I _L of the winning status, since the various special effect is executed by controlling the display device or the like (not shown), is expected to be greater than the load current I _L of the non-winning status. Each of the first state discrimination signal and the second state determination signal, a load prediction signal for predicting the variation of the load current I _L.

The switching transistor 54 is a bipolar transistor, and has a base connected to the input terminal 52, an emitter connected to the power supply voltage, and a collector connected to one end of the first resistance element 55. When the first state determination signal is input to the input terminal from the effect control circuit 92, the switching transistor 54 is turned off without passing the base current and the emitter current. Further, when the second state determination signal is input from the effect control circuit 92 to the input terminal, the switching transistor 54 is turned on by passing a base current and an emitter current. The other end of the first resistance element 55 is connected to the output terminal 53 together with one end of the second resistance element 56 and the third resistance element 57. The other end of the second resistance element 56 is connected to the power supply voltage, and the other end of the third resistance element 57 is grounded. In the threshold value changing circuit 51, the first threshold voltage when the switching transistor 54 is turned on is the first threshold voltage when the switching transistor 54 is turned off by connecting the first resistance element 55 and the second resistance element 56 in parallel. It becomes higher than the threshold voltage V _TH1 .

(Operation of the power supply circuit according to the second embodiment)
FIG. 5 is a timing chart showing the operation of the power supply circuit 2 in a state in which an overcurrent caused by a short circuit or the like does not flow. Since the operation in a state where an overcurrent caused by a rare short circuit flows is the same as the operation of the power supply circuit 1 described with reference to FIGS. 2B and 2C, detailed description thereof is omitted here. 5, the horizontal axis represents the elapsed time, the vertical axis represents the load current I _L. Further, in FIG. 5, each of the alternate long and short dash line indicates a threshold value that causes the overcurrent control circuit 18 to determine that the load current I _L includes an overcurrent caused by a rare short-circuit and to turn the switching circuit 15 in the off state. Show. Dashed line represents the first threshold value when the detection voltage V _D corresponding to the load current I _L exceeds the first threshold voltage V _TH1, the two-dot chain line detection voltage V _D is a second threshold value corresponding to the load current I _L The second threshold value when the voltage V _TH2 is exceeded is shown. Waveform 501 shows an example of the load current I _L.

The operation from when the switch 11 is turned on until the gaming machine starts a steady operation is the same as the operation described with reference to FIG. That is, t ₄₁ to t ₄₄ in FIG. 5 correspond to t ₁₁ to t ₁₄ in FIG. Since the operation from when the switch 11 is turned on until the gaming machine starts a steady operation has been described with reference to FIG. 2 (a), detailed description is omitted here.

At the time indicated by the arrow C when the activation time indicated by t ₄₃ has elapsed since the switch 11 was turned on, the activation timing circuit 32 outputs an activation time elapsed signal to the output invalid circuit 33, and the output invalid circuit 33 indicates “ A “Low” signal is output to the anode of the second diode 34. Thus, as described with reference to FIG. 2 (a), the threshold value of the load current I _L increases to a current corresponding to the first threshold value indicated by the one-dot chain line. Here, since the game ball has not won the winning opening, the production control circuit 92 outputs a first state determination signal to the threshold value changing circuit 51.

When it is detected that the game ball has won the winning opening at the time indicated by the arrow D, the effect control circuit 92 outputs a second state determination signal to the threshold value changing circuit 51. The switching transistor 54 of the threshold value changing circuit 51 is turned on when the second state determination signal is input. When the switching transistor 54 is turned on in response to the winning of the game ball in the winning opening, the first threshold voltage V _TH1 rises according to the load current I _L increased by the execution of the special effect accompanying the winning.

(Operational effect of the power supply circuit according to the second embodiment)
The power supply circuit according to the second embodiment receives a state determination signal corresponding to the operating state of the gaming machine from a control circuit that controls the operation of the gaming machine. The power supply circuit according to the second embodiment can change the first threshold voltage used for overcurrent detection during steady operation according to the input state determination signal. The power supply circuit according to the second embodiment changes the first threshold voltage according to the input state determination signal, thereby detecting sensitivity during steady operation of a relatively small abnormal current such as an overcurrent caused by a rare short. Can be improved.

  For example, in the power supply circuit according to the second embodiment, when the non-winning state load current is about 2 to 3 A and the winning state load current is about 10 A, the non-winning state first threshold voltage corresponds to 5 A. The first threshold voltage in the winning state can be set to a voltage corresponding to 13A. This makes it possible to determine that the current is abnormal and stop supplying the load current to the load circuit when the load current flows 5A or more in the winning state, so that the gaming machine with a relatively small overcurrent caused by a rare short or the like Can prevent ignition.

(Modification of Detection Device According to Embodiment)
In the power supply circuits 1 and 2, both the first overcurrent signal and the second overcurrent signal are output to the latch circuit 42 via the duration time counting circuit 41, but the first overcurrent signal is output from the duration time counting circuit 41. The output may be directly output to the latch circuit 42 without intervention.

  In the power supply circuit 2 according to the second embodiment, the threshold change circuit 51 switches the first threshold voltage between two voltage levels according to the state determination signal input from the effect control circuit 92. In such a power supply circuit, the first threshold voltage may be switched between three or more voltage levels.

(Example of mounting the power supply circuit according to the embodiment on a gaming machine)
The power supply circuit according to the above-described embodiment or modification may be mounted on a gaming machine such as a ball game machine or a spinning game machine.

  FIG. 6 is a schematic perspective view of the ball game machine 100 including the power supply circuit according to the above-described embodiment or modification. FIG. 7 is a schematic rear view of the ball game machine 100. As shown in FIG. 6, the ball game machine 100 is provided in a large area from the upper part to the center part, and includes a game board 101 that is a main body of the game machine, and a ball receiving part that is disposed below the game board 101. 102, an operation unit 103 having a handle, and a display device 104 provided in the approximate center of the game board 101.

  Further, the ball game machine 100 is provided between the fixed board part 105 disposed below the game board 101 on the front surface of the game board 101 and the game board 101 and the fixed game part 105 for the production of the game. And a movable accessory part 106 arranged. A rail 107 is disposed on the side of the game board 101. On the game board 101, a number of obstacle nails (not shown) and at least one winning device 108 are provided.

  The operation unit 103 launches a game ball with a predetermined force from a launching device (not shown) according to the amount of rotation of the handle by the player's operation. The launched game ball moves upward along the rail 107 and falls between a number of obstacle nails. When it is detected by a sensor (not shown) that a game ball has entered any of the winning devices 108, the main control circuit 110 provided on the back surface of the game board 101 determines a predetermined value corresponding to the winning device 108 containing the game balls. The game balls are paid out to the ball receiving unit 102 via a ball payout device (not shown). Further, the main control circuit 110 causes the display device 104 to display various images via an effect control circuit 111 provided on the back of the game board 101.

  The movable accessory part 106 is an example of a movable body that moves according to the state of the game, and is driven by a movable body driving device 112 provided on the back surface of the game board 101. In addition, when the gaming machine 100 has a movable body other than the movable accessory part 106, for example, when the opening part of the winning device 108 has a movable body whose size of the opening is variable, the movable body is also It may be driven by the movable body driving device 112.

  The power supply circuit 113 according to the above-described embodiment or its modification uses the supplied power such as the main control circuit 110, the production control circuit 111, the movable body driving device 112, the display device 104, the launching device, and the ball dispensing device. Electric power is supplied to each load circuit of the gaming machine that operates as described above.

  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.

1, 2, 113 Power supply circuit 11 Switch 12 Rectifier circuit 13 Smoothing capacitor 14 Load current detection circuit 15 Switching circuit 16 First comparison circuit 17 Second comparison circuit 18 Overcurrent control circuit 90 Commercial power supply 91 Load circuit 92, 111 For production Control circuit 100 Ball game machine (game machine)

Claims (6)

A power supply circuit for supplying power to a load circuit provided in a gaming machine,
A rectifier circuit that converts input alternating current into direct current;
A switching circuit that connects between the rectifier circuit and the load circuit when in an on state, and that interrupts a connection between the rectifier circuit and the load circuit when in an off state;
A load current detection circuit for detecting a load current flowing from the rectifier circuit to the load circuit when the switching circuit is in an on state;
A first comparison circuit connected to the load current detection circuit and outputting a first overcurrent signal when the load current is equal to or greater than the first threshold;
When the load current is greater than or equal to a second threshold value that is smaller than the first threshold value and is connected to the load current detection circuit and before a predetermined start-up time elapses after the alternating current is input to the rectifier circuit A second comparison circuit for outputting a second overcurrent signal;
The first overcurrent signal is connected to the first comparison circuit and the second comparison circuit, or the second overcurrent signal is continuously input for a predetermined duration. In response, an overcurrent control circuit that turns off the switching circuit;
A power supply circuit comprising: The overcurrent control circuit includes:
A duration measuring circuit that is connected to the first comparison circuit and the second comparison circuit and counts a time during which the input of the first overcurrent signal or the second overcurrent signal continues;
A switch control circuit that is connected to the duration time counting circuit and outputs an off instruction signal to the switching circuit indicating that the state is to be turned off when the time counted by the duration time counting circuit reaches the duration time; ,
The power supply circuit according to claim 1, comprising: The first comparison circuit includes:
A threshold value changing circuit for changing a first threshold voltage corresponding to the first threshold value in response to an input of a load prediction signal for predicting fluctuations in the load current;
A first comparator that compares a detection voltage corresponding to the load current with the first threshold voltage and outputs a first overcurrent signal when the detection voltage is equal to or higher than the first threshold voltage;
The power supply circuit according to claim 1, comprising: The second comparison circuit includes:
A second comparator that compares a detection voltage corresponding to the load current with a second threshold voltage corresponding to the second threshold and outputs a second overcurrent signal when the detection voltage is equal to or higher than the second threshold voltage; ,
A start-up time counting circuit that outputs a start-up time elapsed signal when the time elapsed since the alternating current is input to the rectifier circuit, and when the measured time has passed the start-up time;
The second overcurrent signal is output when the second overcurrent signal is input before the start time elapse signal is input, and is connected to the second comparator and the start time measuring circuit. An invalidation circuit that does not output the second overcurrent signal when the second overcurrent signal is input after the start time elapsed signal is input;
The power supply circuit according to claim 1, comprising: A load circuit;
A power supply circuit for supplying power to the load circuit,
A rectifier circuit that converts input alternating current into direct current;
A switching circuit that connects between the rectifier circuit and the load circuit when in an on state, and that interrupts a connection between the rectifier circuit and the load circuit when in an off state;
A load current detection circuit for detecting a load current flowing from the rectifier circuit to the load circuit when the switching circuit is in an on state;
A first comparison circuit connected to the load current detection circuit and outputting a first overcurrent signal when the load current is equal to or greater than the first threshold;
When the load current is greater than or equal to a second threshold value that is smaller than the first threshold value and is connected to the load current detection circuit and before a predetermined start-up time elapses after the alternating current is input to the rectifier circuit A second comparison circuit for outputting a second overcurrent signal;
The first overcurrent signal is connected to the first comparison circuit and the second comparison circuit, or the second overcurrent signal is continuously input for a predetermined duration. In response, an overcurrent control circuit that turns off the switching circuit, and a power supply circuit,
A gaming machine characterized by comprising: It further includes an effect control circuit that outputs a load prediction signal that predicts a change in the load current according to the effect,
The first comparison circuit includes:
A threshold value changing circuit for changing a first threshold voltage corresponding to the first threshold value in response to the input of the load prediction signal from the effect control circuit;
A first comparator that compares a detection voltage corresponding to the load current with the first threshold voltage and outputs a first overcurrent signal when the detection voltage is equal to or higher than the first threshold voltage;
The gaming machine according to claim 5, comprising:

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