JP5987722B2 - Power supply - Google Patents

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JP5987722B2
JP5987722B2 JP2013028309A JP2013028309A JP5987722B2 JP 5987722 B2 JP5987722 B2 JP 5987722B2 JP 2013028309 A JP2013028309 A JP 2013028309A JP 2013028309 A JP2013028309 A JP 2013028309A JP 5987722 B2 JP5987722 B2 JP 5987722B2
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transformer
winding
switching
power supply
voltage
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JP2014158374A (en
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悟朗 中尾
悟朗 中尾
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オムロン株式会社
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  The present invention relates to a power supply device used in a gaming machine.

  In a ball game machine, a touch sensor that detects whether or not a player is touching a firing handle may be provided in order to determine whether or not to fire a game ball (see, for example, Patent Document 1). ). In such a touch sensor, an electrode may be exposed in order to detect stray capacitance generated between the touch sensor and the human body. Therefore, in order to prevent the player who touched the electrode from receiving an electric shock due to the power supplied from the commercial power source to the gaming machine, the power source device provided in the gaming machine includes a commercial power source and each circuit provided in the gaming machine. It is required to be insulated.

  In addition, the game machine requires a circuit for driving a voltage required by an integrated circuit for controlling or controlling, and a game ball launching device or a movable accessory for production, such as a main control board. The voltage is different. Further, each circuit of the gaming machine generally operates with a DC voltage. Therefore, the commercial power supply voltage is input to the primary side of the step-down transformer, the power is converted from the secondary side to be lower than the commercial power supply voltage, and the secondary side AC voltage is converted into a DC voltage by the rectifier circuit and the smoothing circuit. There has been proposed a power supply device that outputs and converts the DC voltage into a plurality of different voltages by a DC / DC converter (see, for example, Patent Document 2).

  Further, it has been proposed to provide a plurality of AC / DC converters that convert an AC 24V input voltage into a DC voltage on the power supply board (see, for example, Patent Document 3).

JP 2005-118221 A Japanese Patent Laid-Open No. 11-98685 JP 2011-139930 A

In the technology disclosed in Patent Document 2, in order to reduce the size of the step-down transformer, the power factor is improved by adding a boost chopper circuit between the step-down transformer and the rectifier circuit and the smoothing circuit. A voltage higher than the 24V AC voltage output from the step-down transformer is supplied to the rectifier circuit and the smoothing circuit.
However, in recent gaming machines, the number of light sources has increased or the number of movable accessories has increased in order to enhance the interest of the player, and as a result, the power load tends to increase. The transformer must be enlarged. And the larger the step-down transformer, the higher the cost. Furthermore, as the types of driving voltages of the plurality of circuits provided in the gaming machine increase, the number of necessary DC / DC converters also increases, and the cost also increases. In the technique described in Patent Document 3, AC / DC converters are required as many as the number of drive voltages used by the gaming machine, so the cost increases as the types of driving voltages of a plurality of circuits included in the gaming machine increase. Become.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive power supply apparatus that can handle a high load while maintaining insulation between a commercial power supply and each circuit of a gaming machine.

  As one embodiment of the present invention, a power supply device that supplies power to a circuit provided in a gaming machine is provided. This power supply device includes a rectifier circuit that converts an input AC voltage into a DC voltage, two switching elements connected in series between a positive output terminal and a negative output terminal of the rectifier circuit, and two switching elements A transformer provided so that one of the two terminals is connected to one end of the primary winding and the other of the two terminals is connected to the other end of the primary winding; A voltage detection circuit for detecting an output voltage output from the secondary winding of the transformer and supplied to the circuit of the gaming machine and determining whether or not the output voltage is higher than a predetermined reference voltage; Is lower than the reference voltage, the switching element that is turned on of the two switching elements is turned off, while the switching element that is turned off of the two switching elements is turned on. One And a control circuit for turning on the switching element alternately. The degree of coupling between the primary winding and the secondary winding is such that when the two switching elements are alternately turned on, the primary winding resonates and current flows through the secondary winding. Is set.

  In this power supply device, the degree of coupling is preferably included in the range of 0.8 to 0.95.

  In this power supply device, the transformer preferably has a double insulation structure.

  Furthermore, in this power supply apparatus, it is preferable that the secondary winding of the transformer outputs different voltages from a plurality of different positions of the secondary winding.

  The power supply device according to the present invention has an effect that it can cope with a high load and can be inexpensive while maintaining insulation between the commercial power supply and each circuit of the gaming machine.

It is a schematic block diagram of the power supply device which concerns on one Embodiment of this invention. It is an equivalent circuit diagram of a transformer. FIG. 3 is an equivalent circuit diagram of the power supply device in consideration of an equivalent circuit of the transformer 6 shown in FIG. 2. The relationship of the waveform of the electric current which flows into the switching element connected to the positive electrode side of a rectifier circuit, and the waveform of the electric current which flows into the secondary side coil | winding of a transformer is represented. FIG. 5 is a diagram showing a current flowing through the power supply device between time T0 and time T1 in FIG. FIG. 5 is a diagram showing a current flowing in the power supply device between time T1 and time T2 in FIG. FIG. 5 is a diagram showing a current flowing in the power supply device between time T2 and time T ′ in FIG. 4. FIG. 5 is a diagram showing a current flowing through the power supply device between time T ′ and time T3 in FIG. 4. FIG. 5 is a diagram showing a current flowing through the power supply device between time T3 and time T4 in FIG. The relationship between the waveform of the electric current which flows into the switching element connected to the negative electrode side of a rectifier circuit, and the waveform of the electric current which flows into the secondary side coil | winding of a transformer is represented. It is a figure which shows the electric current which flows into a power supply device between the time T4 and the time T5 in FIG. It is a figure which shows the electric current which flows into a power supply device between the time T5 and the time T6 in FIG. It is a figure which shows the electric current which flows into a power supply device between the time T6 and the time T '' in FIG. It is a figure which shows the electric current which flows into a power supply device between the time T "and the time T7 in FIG. It is a schematic block diagram of the power supply device by a modification. It is a schematic perspective view of the bullet ball game machine provided with the power supply device by embodiment or the modification of this invention. It is a schematic rear view of the ball game machine provided with the power supply device by embodiment or the modification of this invention.

  Hereinafter, a power supply device according to an embodiment of the present invention will be described with reference to the drawings. In this power supply device, an AC voltage supplied from a commercial power source is converted into a DC voltage by a rectifier circuit, and then the DC voltage is connected in series between a positive electrode side output terminal and a negative electrode side output terminal of the rectifier circuit. The voltage is supplied to the primary winding of the transformer connected in series with the capacitor via two switching elements. This power supply device resonates the primary winding by alternately switching on and off the two switching elements in accordance with the leakage inductance of the primary winding of the capacitor and the transformer, thereby revolving the secondary winding of the transformer. Electric power is transmitted to the secondary side of the transformer by passing a current through the wire. Thereby, this power supply device can use a double insulated transformer, and improves insulation between the commercial power supply and each circuit connected to the secondary side of the transformer. Furthermore, this power supply device eliminates the need for a large step-down transformer, thereby reducing costs and making it possible to cope with high loads on connected circuits.

  FIG. 1 is a schematic configuration diagram of a power supply device according to one embodiment of the present invention. As shown in FIG. 1, the power supply device 1 includes rectifier circuits 2 and 7, two switching elements 3-1 and 3-2, a control circuit 4, a capacitor 5, a transformer 6, and a voltage detection circuit 8. And have.

  The rectifier circuit 2 converts an AC 100V voltage input from a commercial power source into a DC voltage. Therefore, for example, as shown in FIG. 1, the rectifier circuit 2 can be a full-wave rectifier circuit having four diodes connected in a bridge form and a smoothing capacitor.

The two switching elements 3-1 and 3-2 are connected in series between the positive output terminal and the negative output terminal of the rectifier circuit 2. Each switching terminal 3-1, 3-2 can be a MOSFET, for example. In the present embodiment, among the source / drain terminals of the switching element 3-2 connected to the lower voltage, the positive output terminal side terminal is connected to the primary winding 61 of the transformer 6 via the capacitor 5. The terminal on the negative output terminal side of the source / drain terminals of the switching element 3-2 is directly connected to the other end of the primary side winding 61 of the transformer 6. Of the source / drain terminals of the switching element 3-2, the terminal on the negative output terminal side is connected to one end of the primary winding 61 of the transformer 6 via a capacitor, and the source of the switching element 3-2. The terminal on the positive output side of the / drain terminal may be directly connected to the other end of the primary winding 61 of the transformer 6. Alternatively, either of the two source / drain terminals of the switching element 3-2 may be connected to one end of the primary winding 61 of the transformer 6 without a capacitor.
The gate terminals of the switching elements 3-1 and 3-2 are connected to the control circuit 4. Each switching element 3-1, 3-2 is switched on / off by a control signal from the control circuit 4. As a result, the primary side winding 61 of the transformer 6 resonates, and as a result, a current flows through the secondary side winding 62 of the transformer 6, so that electric power is transmitted to the secondary side of the transformer 6. The details of the on / off of each of the switching elements 3-1 and 3-2 and the current flowing in the primary side winding 61 and the secondary side winding 62 of the transformer 6 will be described later.

  The transformer 6 is preferably a transformer having a double insulation structure in order to improve insulation between the commercial power supply and a circuit connected to the output side of the transformer 6. For this purpose, the transformer 6 has, for example, a separate bobbin, and has a structure in which a primary winding 61 and a secondary winding 62 are wound separately from each other. The transformer 6 may have another structure that can achieve double insulation.

The ratio between the number of turns of the secondary winding 62 and the number of turns of the primary winding 61 of the transformer 6 is that the first voltage output from both ends of the secondary winding 62 is the power supply circuit 1. The voltage of the circuit that requires the highest voltage among the circuits connected to is set to be, for example, 24V.
Further, a center tap 62 a is attached to the secondary winding 62 of the transformer 6. In the present embodiment, the number of turns from one end of the secondary winding 62 to the center tap 62a is equal to the number of turns from the other end of the winding 62 to the center tap 62a. The output second voltage is ½ of the voltage output from both ends of the secondary winding 62, for example, 12V.

  Furthermore, in the present embodiment, both ends of the secondary winding 62 are connected to the rectifier circuit 7. The rectifier circuit 7 includes two diodes provided between both ends of the winding 62 and the positive output terminal that outputs the first voltage. The two diodes are arranged such that the anode is connected to one end of the winding 62 and power is taken out from the cathode side. Further, the rectifier circuit 7 includes two diodes provided between both ends of the winding 62 and the grounded negative terminal. The two diodes are arranged such that the cathode is connected to one end of the winding 62 and the anode is grounded. Thereby, even if the direction of the current flowing through the winding 62 changes, the first voltage is output from the positive output terminal. The rectifier circuit 7 may include a smoothing capacitor connected to the positive output terminal as shown in FIG. 1 in order to suppress fluctuations in the output voltage.

The voltage detection circuit 8 detects a second voltage output from the center tap 62 a of the secondary winding 62 of the transformer 6. The voltage detection circuit 8 outputs a voltage detection signal having different voltages to the control circuit 4 when the second voltage is equal to or higher than a predetermined reference value (for example, 12 V) and when it is lower than the reference value. Therefore, the voltage detection circuit 8 can be any of various known voltage detection circuits that can output the voltage detection signal as described above, for example.
According to the modification, the voltage detection circuit 8 detects the first voltage output from the positive output terminal, and the first voltage is equal to or higher than a predetermined reference value (for example, 24 V). You may output the voltage detection signal which has a different voltage to the control circuit 4 when it is less than a reference value.

  The control circuit 4 switches on / off the switching elements 3-1 and 3-2 according to the voltage detection signal. Specifically, when the voltage detection signal changes to a value indicating that the second voltage has fallen below the reference value, the control circuit 4 turns off the switching element that is currently turned on and then turns off until then. Turn on the switching element. As a result, the control circuit 4 resonates the primary side winding 61 of the transformer 6, causes a current to flow through the secondary side winding 62 of the transformer 6, and transmits power to the secondary side of the transformer 6.

  Hereinafter, details of the operation of the power supply device 1 will be described.

FIG. 2 is an equivalent circuit diagram of the transformer 6. Here, L 1 and L 2 are a primary side self-inductance and a secondary side self-inductance of the transformer 6, respectively, and k is a degree of coupling. (1-k) L 1 corresponds to the leakage inductance on the primary side. KL 1 corresponds to the excitation inductance. The degree of coupling is represented by the following formula.
Here, k is the degree of coupling, and L open and L s are the inductances on the secondary side when the primary winding 61 of the transformer is released and short-circuited, respectively.

FIG. 3 is an equivalent circuit diagram of the power supply device 1 in consideration of the equivalent circuit of the transformer 6 shown in FIG. In FIG. 3, for simplification, the output from the center tap 62a of the secondary winding 62 of the transformer 6, the control circuit 4 and the voltage detection circuit 8 are omitted. In FIG. 3, L 1 , L 2 , and L 3 represent apparent capacities of the primary side winding 61 of the transformer 6, and primary side leakage inductance, excitation inductance, and secondary side leakage inductance, respectively. Represents.

  FIG. 4 shows the relationship between the waveform of the current flowing through the switching element 3-1 connected to the positive electrode side of the rectifier circuit 2 and the waveform of the current flowing through the secondary winding of the transformer 6. In FIG. 4, the horizontal axis represents time, and the left vertical axis represents current. The graph 401 represents the waveform of the current flowing through the switching element 3-1, and the graph 402 represents the waveform of the current flowing through the secondary winding of the transformer 6. Further, a graph 403 represents a period during which the switching element 3-2 is on (see the right vertical axis), and a graph 404 represents a period during which the switching element 3-1 is on. Note that one cycle is from time T0 shown in FIG. 4 to time T0 in FIG. 10 described later, and the power supply device 1 repeats the operation of the cycle while power is supplied from the commercial power supply to the power supply device 1. .

Immediately before time T0, it is assumed that the switching element 3-1 is turned off and the switching element 3-2 is turned on. At time T0, to the switching element 3-2 is switched from ON to OFF, the primary side, as indicated by arrow 301 in FIG. 3, the exciting inductance L2,1 primary leakage inductance L 1 and the switching element 3-2 and current flows through the, toward the secondary-side leakage inductance L 3, the current is not flowing. Therefore, no current flows on the secondary side of the transformer 6.

Thereafter, at time T1, the switching element 3-1 is turned on. In the control circuit 4, as shown in T0 to T1 shown in FIG. 4, both the switching elements 3-1, 3-2 are turned on, and the positive output terminal and the negative output terminal of the rectifier circuit 2 are short-circuited. In order to prevent this, a dead time is provided between turning off one switching element and turning on the other switching element. FIG. 5 is a diagram showing a current flowing through power supply device 1 between time T0 and time T1 in FIG. Between the time T0 and the time T1, any switching element is off. At this time, the current flows so as to maintain a current in the same direction as the original current according to Lenz's law. That is, the current flows through the exciting inductance L 2 , the primary side leakage inductance L 1 and the body diode of the switching element 3-1 as indicated by an arrow 501, and at the same time as indicated by an arrow 502. also it flows through the secondary-side leakage inductance L 3 side. Therefore, a current also flows through the secondary winding 62 of the transformer 6 as indicated by an arrow 503. Thereby, electric power is transmitted to the secondary side of the transformer 6. Note that the current indicated by the arrow 501 gradually approaches 0 as time elapses. At time T2, the current becomes zero.

FIG. 6 is a diagram showing a current flowing through power supply device 1 between time T1 and time T2 in FIG. Also during this period, as indicated by the arrow 601, the current flows through the excitation inductance L 2 , the primary side leakage inductance L 1, and the switching element 3-1 as in the period from time T 0 to time T 1 . However, in this case, current flows via the source and drain of the switching element 3-1. At the same time, as indicated by arrow 602, flows through the secondary-side leakage inductance L 3 side. Therefore, a current also flows through the secondary winding 62 of the transformer 6 as indicated by an arrow 603, and power is transmitted to the secondary side of the transformer 6.

Thereafter, electric power is transmitted to the secondary winding 62 by the current flowing through the primary winding 61 of the transformer 6 until time T3.
7 flows to the power supply apparatus 1 during a period from time T2 in FIG. 4 to time T ′ (where T2 <T ′ <T3) when the primary winding 61 of the transformer 6 releases all excited energy. It is a figure which shows an electric current. In this period, as indicated by an arrow 701, from the positive electrode side output terminal of the rectifier circuit 2 via the switching elements 3-1, current flows in the secondary side leakage inductance L 3. Further, during this period, as indicated by an arrow 702, a current also flows in the direction in which the excitation energy of the primary winding 61 of the transformer 6 is released. Therefore, a current also flows through the secondary winding 62 of the transformer 6 as indicated by an arrow 703, and power is transmitted to the secondary side of the transformer 6.

FIG. 8 is a diagram showing a current flowing through the power supply device 1 in the period from time T ′ to time T3 in FIG. In this period, as indicated by arrow 801, rectified from the positive electrode side output terminal of the circuit 2 via the switching element 3-1, a current to the exciting inductance L 2 flows again the primary winding 61 is energized together with the, current also flows through the secondary side leakage inductance L 3. Therefore, a current flows also in the secondary winding 62 of the transformer 6 as indicated by an arrow 802, and power is transmitted to the secondary side of the transformer 6.

When the time T3 is reached, no current flows through the secondary winding 62. Thereafter, until time T4 when the voltage output from the secondary winding 62 of the transformer 6 falls below the reference value, the current is supplied from the positive output terminal of the rectifier circuit 2 as indicated by an arrow 901 in FIG. through the switching element 3-1, a current to the exciting inductance L 2 flows, the primary winding 61 is energized.

  FIG. 10 shows the relationship between the waveform of the current flowing through the switching element 3-2 and the waveform of the current flowing through the secondary winding of the transformer 6. In FIG. 10, the horizontal axis represents time, and the left vertical axis represents current. A graph 1001 represents a waveform of a current flowing through the switching element 3-2, and a graph 1002 represents a waveform of a current flowing through the secondary winding 62 of the transformer 6. Further, a graph 1003 represents a period during which the switching element 3-1 is on (see the right vertical axis), and a graph 1004 represents a period during which the switching element 3-2 is on.

  At time T4, the power detection circuit 8 detects that the output voltage on the secondary side of the transformer 6 has fallen below the reference value, and the control circuit 4 turns off the switching element 3-1. At subsequent time T5, switching element 3-2 is turned on.

FIG. 11 is a diagram showing a current flowing through power supply device 1 between time T4 and time T5 in FIG. As described above, between the time T4 and the time T5, all the switching elements are off. At this time, the current flows so as to maintain a current in the same direction as the original current according to Lenz's law. That is, the current, as indicated by an arrow 1101, the body diode of the switching element 3-2, flows through the primary-side leakage inductance L 1 and the exciting inductance L 2 at the same time, as indicated by an arrow 1102, also it flows towards from the secondary side leakage inductance L 3 to the exciting inductance L 2. Therefore, a current also flows through the secondary winding 62 of the transformer 6 as indicated by an arrow 1103. Thereby, electric power is transmitted to the secondary side of the transformer 6. Note that the current indicated by the arrow 1101 gradually approaches 0 as time elapses. At time T6, the current becomes zero.

FIG. 12 is a diagram showing a current flowing through the power supply device 1 between time T5 and time T6 in FIG. Also during this period, the current flows through the switching element 3-2, the primary side leakage inductance L 1, and the exciting inductance L 2 as indicated by an arrow 1201 as in the period from the time T 4 to the time T 5. However, in this case, current flows via the source and drain of the switching element 3-2. At the same time, as indicated by arrow 1202, flowing in the secondary leakage inductance L 3 side. Therefore, a current also flows through the secondary winding 62 of the transformer 6 as indicated by an arrow 1203, and power is transmitted to the secondary side of the transformer 6.

Thereafter, electric power is transmitted to the secondary winding 62 by the current flowing through the primary winding 61 of the transformer 6 until time T7.
13 flows to the power supply device 1 in a period from time T6 in FIG. 10 to time T ″ (where T6 <T ″ <T7) when the primary winding 61 of the transformer 6 releases all excited energy. It is a figure which shows an electric current. In this period, as indicated by an arrow 1301, a current flows through the inductance secondary leakage from the capacitor 5 L 3, 1 primary leakage inductance L 1 and the switching element 3-2. Further, during this period, as indicated by an arrow 1302, a current also flows in a direction in which the excitation energy of the primary winding 61 of the transformer 6 is released. Therefore, a current also flows through the secondary winding 62 of the transformer 6 as indicated by an arrow 1303, and power is transmitted to the secondary side of the transformer 6.

FIG. 14 is a diagram showing a current flowing through the power supply device 1 during a period from time T ″ to time T7 in FIG. 10. In this period, as indicated by an arrow 1401, the excitation inductances L 2 and 2 from the capacitor 5 are shown. next leakage inductance L 3, through the switching elements 3-2, a current flows, is excited is the primary winding 61 again. Therefore, even in the secondary winding 62 of the transformer 6, arrows A current flows as indicated by 1402, and power is transmitted to the secondary side of the transformer 6.

When the time T7 is reached, no current flows through the secondary winding 62. Thereafter, until time T0 when the voltage output from the secondary winding 62 of the transformer 6 falls below the reference value, as shown by the arrow 301 in FIG. 3, the excitation inductance L 2 and the primary leakage inductance L 1 Current flows through the switching element 3-2 and the primary winding 61 is excited. At time T0, it is detected by the voltage detection circuit 8 that the output voltage has fallen below the reference value, and the control circuit 4 turns off the switching element 3-2 according to the detection result, and switches the switching element 3-1. turn on.

As described above, power is not transmitted to the secondary side of the transformer 6 in the period from time T3 to T4 and in the period from time T7 to T0. Therefore, it is preferable that the period from time T3 to T4 and the period from time T7 to T0 be as short as possible. Moreover, the cross regulation characteristic on the secondary side of the transformer 6 depends on the forward voltage drop of the diode of the rectifier circuit 7, and the forward voltage drop depends on the current peak. Therefore, it is preferable to suppress the peak of the current flowing on the secondary side of the transformer 6 as much as possible.
Therefore, in the present embodiment, by adjusting the interval between the ferrite core inserted in the center of the primary winding 61 of the transformer 6 and the ferrite core inserted in the center of the secondary winding 62, The degree of coupling between the primary winding 61 and the secondary winding 62 is set to about 0.8 to 0.95. By setting the degree of coupling to about 0.8 to 0.95, the period during which power is not transmitted from the primary side to the secondary side of the transformer 6 (the above T3 to T4 and T7 to T0) can be made substantially zero. In addition, the shorter the period during which power is not transmitted from the primary side to the secondary side of the transformer 6, the smaller the change width of the current flowing through the secondary side of the transformer 6, resulting in a lower current peak. Regulation characteristics are also improved. If the degree of coupling is less than 0.8, the excitation current on the primary side of the transformer 6 only increases as the degree of coupling decreases, which is not preferable because the transmission efficiency of power from the primary side to the secondary side decreases. .
Further, by improving the cross regulation characteristics, the power supply device 1 can stably supply power to each output even when a plurality of outputs having different voltages are taken out from the secondary winding of the transformer 6. As a result, there is no need to use a DC / DC converter to obtain multiple outputs.

  As described above, in this power supply device, power from the commercial power supply is supplied to the circuit side connected to the power supply device using a transformer having a double insulation structure, so that the power supply device is connected to the commercial power supply and the power supply device. It is possible to improve insulation from the circuit. Moreover, since this power supply device does not use a large step-down transformer that reduces the voltage from the commercial power supply, it can stably supply power even when a high load is applied. Furthermore, since this power supply device can output a plurality of different voltages with a single transformer, the circuit configuration is simple, and as a result, the cost can be reduced.

  A power supply device according to another modification is shown in FIG. In the power supply device 1 ′ shown in FIG. 15, the positive terminal side terminal of the source / drain terminals of the switching element 3-1 connected to the higher voltage is connected to the transformer 6 via the capacitor 5. The terminal on the negative electrode side of the source / drain terminals of the switching element 3-1 is directly connected to the other end of the primary winding 61 of the transformer 6. Note that a terminal on the negative side of the source / drain terminals of the switching element 3-1 is connected to one end of the primary side winding 61 of the transformer 6 via the capacitor 5, and the source of the switching element 3-1. The terminal on the positive terminal side of the / drain terminal may be directly connected to the other end of the primary winding 61 of the transformer 6.

  According to another modification example, a boost chopper circuit disclosed in, for example, Japanese Patent Application Laid-Open No. 11-98685 is provided between the rectifier circuit 2 and the switching elements 3-1, 3-2 of the power supply device. A circuit for improving the power factor may be inserted.

According to another modification, the center tap 62a of the secondary winding 62 of the transformer 6 may be grounded. Furthermore, a rectifier circuit similar to the rectifier circuit 7 may be connected to any intermediate point between the center tap 62a and the end point of the secondary winding 62 to extract a DC voltage. In this case, the voltage extracted from the intermediate point is the ratio of the number of turns from the center tap 62a to the intermediate point with respect to the number of turns from the center tap 62a to the end point of the secondary winding 62. A value obtained by multiplying the voltage between the end points of the secondary winding 62 is obtained. Accordingly, by adjusting the position of the intermediate point, the ratio of the voltage extracted from the end point of the secondary winding 62 and the voltage extracted from the intermediate point can be arbitrarily adjusted. Further, in order to obtain three or more types of output voltages, a rectifier circuit similar to the rectifier circuit 7 is connected to each other from a plurality of intermediate points between the center tap 62a and the end point of the secondary winding 62 to generate a DC voltage. You may take it out.
Alternatively, for at least one of the output terminals of the power supply device, a DC / DC converter may be connected in parallel with a path for outputting the voltage of the terminal as it is, so that three or more types of output voltages can be obtained.

The power supply device 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. 16 is a schematic perspective view of the ball game machine 100 including the power supply device according to the above-described embodiment or modification. FIG. 17 is a schematic rear view of the ball game machine 100. As shown in FIG. 16, the ball game machine 100 is provided in a large area from the upper part to the center part, and 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 displays various images on the display device 104 via the effect CPU 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 prize winning device 107 has a movable body that makes the size of the opening variable, the movable body is also It may be driven by the movable body driving device 112.

  The power supply device 113 according to the above-described embodiment or its modification operates using the supplied power such as the main control circuit 110, the rendering CPU 111, the movable pair drive device 112, the display device 104, the launching device, and the ball dispensing device. Power is supplied to each circuit of the gaming machine. For example, the power supply device 113 supplies the lower (second) output voltage to the main control circuit 110 and the rendering CPU 111, and the higher (first) to the movable pair drive device 112, the launching device, the ball dispensing device, and the like. ) Output voltage.

  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.

DESCRIPTION OF SYMBOLS 1, 1 'Power supply device 2, 7 Rectifier circuit 3-1, 3-2 Switching element 4 Control circuit 5 Capacitor 6 Transformer 8 Voltage detection circuit 61 Primary side winding 62 Secondary side winding 100 Ball game machine 101 Game Panel 102 Ball receiving unit 103 Operation unit 104 Display device 105 Fixed accessory unit 106 Movable accessory unit 107 Rail 108 Prize winning device 110 Main control circuit 111 CPU for production
112 Movable body drive device 113 Power supply device

Claims (4)

  1. A power supply device for supplying power to a circuit provided in a gaming machine,
    A rectifier circuit that converts the input AC voltage into a DC voltage;
    Two switching elements connected in series between the positive output terminal and the negative output terminal of the rectifier circuit;
    One of the two terminals of the two switching elements is connected to one end of the primary winding, and the other of the two terminals is connected to the other end of the primary winding. A transformer provided as
    A voltage detection circuit for detecting an output voltage output from the secondary winding of the transformer and supplied to the circuit of the gaming machine and determining whether the output voltage is higher than a predetermined reference voltage;
    When the output voltage becomes lower than the reference voltage, the switching element that is turned on of the two switching elements is turned off, while the switching element that is turned off of the two switching elements is turned on. A control circuit for alternately turning on the two switching elements,
    Have
    The primary winding and the secondary winding are configured such that when the two switching elements are alternately turned on, the primary winding is resonated so that a current flows through the secondary winding. A power supply device in which a degree of coupling between the two is set.
  2.   The power supply device according to claim 1, wherein the degree of coupling is included in a range of 0.8 to 0.95.
  3.   The power supply device according to claim 1, wherein the transformer has a double insulation structure.
  4.   4. The power supply device according to claim 1, wherein the secondary winding of the transformer outputs different voltages from a plurality of different positions of the secondary winding. 5.
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JPS6099891U (en) * 1984-11-05 1985-07-08
JP4980588B2 (en) * 2005-06-21 2012-07-18 ローム株式会社 Step-down switching regulator, its control circuit, and electronic equipment using the same
JP2007174793A (en) * 2005-12-21 2007-07-05 Sanken Electric Co Ltd Multiple output switching power supply
JP4747849B2 (en) * 2006-01-20 2011-08-17 オムロン株式会社 Switching power supply
JP2007336770A (en) * 2006-06-19 2007-12-27 Sony Corp Switching power-supply circuit

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