JPH1198685A - Game machine power supply circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a game machine power supply circuit the DC output of which does not decline, the power factor is improved, the conversion efficiency is satisfactory, and the stability is high. SOLUTION: A commercial power supply voltage is inputted to the primary side of a step-down transformer 11 of a game machine power supply circuit. An AC voltage which is lower than the commercial power supply voltage is outputted from the secondary side of the step-down transformer 11, and the secondary AC voltage is converted into a DC voltage by a rectifying circuit 12 and a smoothing circuit 13. Since a 1st output voltage higher than the input voltage can be obtained by inserting a step-up type chopper circuit 15 between the rectifying circuit 12 and the smoothing circuit 13, even if the input voltage changes slightly, a standard output voltage, particularly a DC 30 V system stable output voltage, can be obtained. An input power factor can be improved, the electrical continuity angle of the input current waveform is widened and the size of the step-down transformer 11 which transforms an AC100 V into an AC24 V can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for a torsion type gaming machine which is required to output a relatively large output power at a low AC input voltage, and more particularly to a commercial input voltage. Step down to AC24V,
This AC24V to DC30V system, DC24V system, DC
The present invention relates to an improvement of a multi-output power supply circuit for a drum-rotating game machine which converts a voltage into a 12V system, a DC5V system or the like to obtain an output power of about 200W.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional power supply circuit for a drum-rotating game machine converts a 100 V AC of a commercial power supply 10 into a 24 V AC by a step-down transformer 11, and then a rectifier circuit 12 and a smoothing circuit 13. Is rectified and smoothed.
This rectified and smoothed voltage, that is, AC24V × √
2 ≒ DC32V is DC32V terminal 17 and ground terminal 2
It is obtained as a first output DC 30 V system while being unstable during one period.

[0003] The first output DC 30 V system is provided with DC / DC converters 22, 23 and 24 of non-insulated type.
/ DC conversion and smoothing by the capacitors 25, 26, 27, and voltages of 24 V DC system, 12 V DC system, 5 V DC system, etc. are obtained at the terminals 18, 19, 20, respectively. A DC30V system is supplied to a lamp, a DC24V system is supplied to a motor and a solenoid of each part, a DC12V system is supplied to an acoustic circuit, and a DC5V system is supplied to a microcomputer, etc., and a total of 200 W
This was a configuration to obtain about output power.

[0004]

However, in a conventional circuit configuration, a switchboard 2 is used in a gaming machine store as shown in FIG.
8 commercial AC100V, through outlet 29, AC plug 30 and step-down transformer 11 to AC24V
, The input current of the power supply circuit that outputs the same power becomes about four times. Also, the condition of the load current of the spinning-type gaming machine changes greatly between a steady operation and a big hit of the gaming machine. Therefore, the voltage drop of the step-down transformer 11 causes a large change in the AC 24 V voltage to the power supply circuit, the stability of the unstable DC 30 V system output is further deteriorated, and the brightness of the lamp used in the spinning-type gaming machine is reduced. , Or the output of DC24V decreases, and the rotational speed of the motor decreases.

Further, since the power supply circuit has a capacitor input, the input power factor is poor, and the input current waveform is
Since V is converted to 24 V AC by the step-down transformer 11, the input current of the power supply circuit that outputs the same power becomes about four times, and as shown in FIG. Although the input current has a narrow conduction angle and the same effective current, the apparent current increases, and the output voltage of the step-down transformer 11 decreases. That is, the input voltage to the capacitor 13 is a sine wave, which is smoothed to have a ripple voltage waveform immediately after the capacitor 13. However, the input current to the capacitor 13 flows only when the input voltage is higher than the voltage of the capacitor 13, and although the input voltage is a sine wave, the current waveform has a narrow conduction angle and a large peak. , The crest value increases.
Therefore, the power factor is extremely bad, about 0.5. For this reason, the step-down transformer 11 has to use a large apparent power.

Further, in order to convert the output power of about 200 W from the first output, that is, an unstable 30 V DC system, the DC / DC converters 22, 23, and 24 at the subsequent stage are non-insulated.
Regardless of the configuration of the insulation, the input voltage range must be widened, and the conversion current is large and the conversion efficiency is deteriorated.

Further, when the rectified and smoothed AC 24 V is input to, for example, a forward converter, the output power is 200 W depending on the size of the smoothing capacitor.
Even when the capacitor has a capacity of 10,000 μF or more, since charging / discharging is performed at a low frequency by a commercial power supply, the ripple voltage valley becomes DC 25 V or less, and the current of the switch element increases. Specifically, a switching current of 25 A or more flows in a pulse, and a switching element of a large current is required. In addition to the switching element, a large loss is caused by a diode, an inductance element, a resistance of a printed wiring board, etc. Was as low as 60% or less.

Furthermore, the first output, that is, the unstable D
The C30V system has a capacitor 1 as a smoothing circuit after rectification.
No.3, a ripple voltage twice as high as the commercial input frequency appears, and if DC24V is configured by a step-down chopper, the commercial ripple will also occur in the DC24V output if the input voltage decreases or the output current increases. Appeared, and the stability became worse.

SUMMARY OF THE INVENTION The present invention provides a power supply circuit for a revolving-type gaming machine which is required to output a relatively large output power at a low AC input voltage, in which the DC output is not reduced, the power factor is improved, and the conversion efficiency is improved. It is an object of the present invention to obtain a highly stable power supply circuit.

[0010]

According to the present invention, a commercial power supply voltage is input to the primary side of a
The power is converted from the secondary side to a voltage lower than the commercial power supply voltage.
In a power supply circuit configured to convert a secondary-side AC voltage into a DC voltage by a rectifier circuit 12 and a smoothing circuit 13 and output the DC voltage, a step-up chopper having a power factor improving function between the rectifier circuit 12 and the smoothing circuit 13 A power supply circuit for a gaming machine, comprising a circuit 15.

To convert and obtain a first output higher than the input voltage by adding a step-up chopper circuit 15 after rectifying the power supply circuit provided on the output side converted from AC 100 V to AC 24 V by the step-down transformer 11. , Even if the input voltage changes slightly, the specified output voltage, especially D
The output of the C30V system can be stably obtained. Also,
By adding the step-up chopper circuit 15 to the input of the power supply circuit, the input power factor can be improved and the conduction angle of the input current waveform can be widened, and the step-down transformer 11 for converting from 100 V AC to 24 V AC can be downsized. be able to.

Conventionally, the power factor is poor because of the capacitor input, and only two or three units can be connected. However, in the case of a spinning-type game machine in which the apparent power is reduced by the improvement of the power factor by the step-up chopper circuit 15, 3 units are used. Up to 5 units can be connected.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an example of power supply wiring in a gaming machine store. In FIG. 3, in a gaming machine store, 10 to 20 gaming machines 33 are collected into islands (groups) in order to facilitate replacement and re-installation of the spinning-type gaming machines 33. Is converted from AC 100 V to AC 24 V by a step-down transformer 11 of a power supply circuit, and various stabilized DC voltages are obtained and supplied to two to three gaming machines 33.

FIG. 1 is a block diagram showing a basic configuration of a power supply circuit for a game machine according to the present invention. In FIG.
The voltage is converted into AC 24 V by the transformer 11 and rectified by the rectifier circuit 12 including a full-wave rectifier. The present invention relates to this rectifier circuit 1
A boosting chopper circuit 15 is added between the smoothing circuit 13 and the capacitor 2. By adding this step-up chopper circuit 15, the first output higher than the input voltage from the rectifier circuit 12 is converted and obtained by the step-up chopper circuit 15, so that even if the input voltage slightly changes, the specified output voltage In particular, an output of a DC 30 V system can be stably obtained.

The boost chopper circuit 15 improves the input power factor as shown in FIG. 2 by adopting the circuit in Japanese Patent No. 2515650, which has already been proposed by the present applicant, as shown in FIG. A step-down transformer 11 that can widen the conduction angle of the input current waveform (b) with respect to the input voltage and converts AC100V to AC24V
Can be reduced in size. In FIG. 1, the capacitor 16 is for a small-capacity bypass for flowing a high-frequency current of the step-up chopper circuit 15, and has almost no smoothing action.

A first specific embodiment of the present invention is shown in FIG. 4 and will be described in detail below. AC100 of commercial power supply 10
The voltage is transformed from V to AC 24 V by the step-down transformer 11 and rectified by the rectifier circuit 12. A step-up chopper circuit 15 is inserted between the rectifier circuit 12 and the capacitor 16 as a smoothing circuit to convert the voltage as a first converted voltage to a voltage not exceeding DC 40 V (for example, DC 35 V), and to convert the voltage into a non-insulated step-down voltage. Type DC / DC converters 34, 22,
DC30V, DC24V, DC1 at 23 and 24 respectively
It controls and outputs 2V and 5V DC.

The step-up chopper circuit 15 includes a reactor 35, a rectifying element 36, a switching element 37, a PWM
It comprises a control IC 38 and an output current detection resistor 56. The inside of the PWM control IC 38 is described in detail in
No. 515650, a first non-inverting error amplifier, a second non-inverting error amplifier, a comparator,
It comprises an AND circuit, an inverter circuit, a flip-flop circuit, an oscillator, a reference voltage regulator, a NAND circuit, a transistor and the like. The DC / DC converters 34, 22, 23, and 24 include a capacitor 13, a switching element 40, a PWM control IC 41, a rectifying element 42, and a filter circuit 45. This filter circuit 4
Reference numeral 5 includes a reactor 43 and a capacitor 44.

The operation of the above configuration will be described. The commercial power supply 10 is full-wave rectified by the rectifier circuit 12,
At the point (a), a full-wave rectified voltage as shown in FIG. 5A is obtained. This is the inductor 3 of the boost chopper circuit 15.
5, a ripple voltage delayed by an input current at twice the commercial frequency as shown in FIG. 5B is generated at both ends of the capacitor 13 as a smoothing circuit after being boosted by the rectifying element 36 and the switching element 37. I do. This first
As a conversion voltage (for example, D
C35V) and convert this voltage to non-insulated step-down DC
/ DC converters 34, 22, 23, 24
C30V, DC24V, DC12V and DC5V are controlled and output.

Next, the power factor improving operation of the boost chopper circuit 15 will be described. The output voltage signal detected by the resistor 56 as shown in FIG. 3C is applied to the positive side of the non-inverting error amplifier in the PWM control IC 38. Further, a minute signal inverted with respect to the input voltage as shown in FIG. 3D is injected as a reference voltage waveform into the non-inversion error amplifier on the negative side.

Specifically, when a voltage generated by a current as shown in FIG. 3 (h) flowing through the output current detecting resistor 56 is injected, the negative input voltage V of the non-inverting error amplifier is input.
(-) Indicates the reference voltage Vref as shown in FIG.
And a small signal inverted with respect to the input voltage.

In the signal as it is, the voltage phase on the + side of the non-inverting error amplifier is out of phase with the input current, and the voltage on the − side is, as shown in FIG. It must be phase matched because it is twice as late as the input current and out of phase. Therefore, the voltage change is delayed as shown in FIG. 3C by the resistance and the charging time constant of the capacitor in the PWM control IC 38, and this is used as the + input voltage of the non-inverting error amplifier.
Error amplification is performed with the same phase as the negative input voltage. Specifically, the capacitance of the capacitor for the charging time constant is adjusted so that the + input voltage of the non-inverting error amplifier is delayed by 3 × π / 4 from the − input voltage.

A signal as shown in FIG. 3E in which the error amplification is adjusted by the non-inverting error amplifier is converted to a PWM control IC 3
8 is input to the minus side of the comparator. The triangular wave signal of the oscillator in the PWM control IC 38 is compared with the triangular wave signal shown in FIG. 3F by a comparator, and in the trough of the input voltage as shown in FIG. Large boost ratio),
At the peak portion of the input voltage, a pulse signal with a short ON time (small boosting ratio) can be obtained. The signal as shown in FIG.
The signal becomes the gate signal of the switching element 37 as it is, and the boost chopper circuit 15 operates.

With the above configuration, the boost chopper circuit 15
Has a power factor improving effect at the same time, can reduce the apparent current of the power supply circuit, and can reduce the size of the step-down transformer 11 for transforming from AC 100 V to AC 24 V, or use the same step-down transformer 11 The number of spinning-type gaming machines 33 to be connected can be increased.

The first converted voltage at point (b) in FIG.
Set to C40V or less is a general-purpose step-down DC / DC
Since the upper limit of the input voltage of the converter is DC40V, DC30V, DC24V, DC12V, DC5V from this voltage
Conversion can be easily performed, and general-purpose DC / D
A C converter module can be used.

Also, DC30V and DC24V have relatively large power (for example, DC30V.3A, DC24V).
V.4A), when power cannot be converted by a general-purpose DC / DC converter, it can be realized, for example, by configuring the power components of the DC / DC converter with discrete components corresponding to each output.

FIG. 6 shows a second specific embodiment of the present invention.
This will be described in detail below. In the second embodiment, AC10
After the voltage is changed from 0V to 24V AC by the step-down transformer 11, the step-up chopper 15 is added to the input side of the power supply circuit of the gaming machine 33, and the first conversion voltage is 40V DC.
As described above, the voltage is raised to, for example, about 50 V DC, and from this voltage, 30 V DC is stabilized and output by the insulated switching power supply circuit 57, and further, the 24 V DC is converted from the 30 V DC by the non-insulated step-down DC / DC converters 22, 23, and 24.
V, DC12V and DC5V are controlled and output.

The insulated switching power supply circuit 57 comprises:
Transformer 46, switching element 53 composed of MOS-FET, resistor 54, capacitor 55, PWM control IC
52, rectifier 47, commutation rectifier 48, reactor 49,
Capacitor 39, feedback circuit 5 for error detection
0, an insulating means 83 such as a photocoupler.

The power supply circuit configured as described above is suitable for obtaining an insulated power supply circuit as a multi-output power supply for a game machine, and stably obtains a specified output voltage even if the input voltage AC24V changes. be able to. The step-up chopper 15 has a power factor improving effect at the same time, can reduce the apparent current of the power supply circuit, can reduce the size of the step-down transformer 11 for converting AC100V to AC24V, or can use the same step-down transformer. The operation and effect that the number of the spinning-type gaming machines 33 connected to the eleventh embodiment can be increased is the same as that of the first embodiment.

In the second embodiment, the first conversion voltage is set to about 50 V DC because a general-purpose rectifier, electrolytic capacitor, and switch element are used. This is because the applied voltage is about twice as large as the input voltage, so that a relatively wide variety of 100 V products can be used as the breakdown voltage of the switch element.

Also in the second embodiment, the forward
Converter output DC30V to DC24V, D
For conversion of C12V, DC5V, etc., a general-purpose DC / DC converter module can be used. Also, D
The C24V system has relatively large power (for example, DC24
V.4A), when power cannot be converted by a general-purpose DC / DC converter, it can be realized, for example, by configuring the power components of the DC / DC converter with discrete components corresponding to each output.

The second converted voltage is not limited to DC 50 V. If the current of the boosting type chopper circuit 15 can be tolerated, it is better to convert the voltage to a higher voltage so that the current of the subsequent isolated switching power supply circuit 57 is higher. Less and efficiency is improved. However, if the step-up ratio is too high, the loss of the step-up chopper circuit 15 increases. Therefore, it is practical to use about 45 V to 80 V in consideration of both losses.

From the unstable DC 30 V of the first embodiment to DC 2
Conversion from 4V, 12V DC, 5V DC and stabilized DC30V of the second embodiment to 24V DC, 12V DC,
Conversion to DC 5 V is performed by the applicant of the present application, Japanese Patent Application No. 5-3387.
No. 94 (Japanese Unexamined Patent Publication No. 7-163140) can be easily realized by using a DC / DC converter module.

The 24 VDC of the first embodiment and the 30 VDC and 24 VDC of the second embodiment have relatively large electric power (for example, 30 VDC / 3 A or 24 VDC / 4 A), and cannot be converted in terms of power with a general-purpose DC / DC converter. In such a case, for example, a high-efficiency DC / DC converter circuit as disclosed in Japanese Patent Application No. 4-224574 (Japanese Patent Application Laid-Open No. 5-304768) of the applicant of the present invention can be realized by a discrete circuit.

[0034]

As described above, according to the present invention, the booster chopper circuit 15
Is added, a specified output voltage can be stably output even with a low input voltage, and each output voltage can be stably supplied even if the input voltage changes.

Since the input power factor can be improved and the input current waveform can be made proportional to the input voltage waveform by the step-up chopper circuit 15, the input effective current is reduced and the step-down
The transformer 11 can be reduced in size.

By improving the input power factor, the number of game machines that can be connected to one step-down transformer 11 can be increased from two to three to three to five.

By inserting the step-up chopper circuit 15 between the rectifier circuit 12 and the smoothing circuit 13, the frequency of the conventional commercial power supply is changed from 5 to 60 Hz to several hundred KHz to several MH.
A high frequency of z, and a capacitor constituting the smoothing circuit 13 can be a capacitor having a small capacity.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a gaming machine power supply circuit according to the present invention.

FIG. 2 is a waveform diagram of an input current with respect to an input voltage in the gaming machine power supply circuit of the present invention.

FIG. 3 is a block diagram illustrating an example of power supply wiring of a gaming machine store.

FIG. 4 is a first specific example of a power supply circuit for a game machine according to the present invention;
It is an electric circuit diagram showing an example.

FIG. 5 is a waveform diagram of each section for explaining power factor improvement by the boost chopper circuit 15.

FIG. 6 is a second specific example of the power supply circuit for a game machine according to the present invention.
It is an electric circuit diagram showing an example.

FIG. 7 is a block diagram showing a configuration of a conventional power supply circuit for a spinning-type gaming machine.

FIG. 8 is a waveform diagram of an input current with respect to an input voltage in a conventional power supply circuit for a torsion machine.

[Explanation of symbols]

10: commercial power supply, 11: step town transformer, 1
2 rectifier circuit, 13 smoothing circuit, 15 step-up chopper circuit, 16 capacitor, 17 DC 30 V terminal, 18
... DC24V terminal, 19 ... DC12V terminal, 20 ... DC
5V terminal, 21 earth terminal, 22, 23, 24 non-insulated DC / DC converter, 25, 26, 27 capacitor, 28 distribution board, 29 outlet, 30 AC plug, 31 output connector, 32 Input connector, 33
··· Rotating-type gaming machine, ······························································································································· Control I
C, 42: rectifier, 43: reactor, 44: capacitor, 45: filter circuit, 46: transformer, 47, 4
8 rectifier element, 49 reactor, 50 feedback circuit, 51 insulating means, 52 PWM control IC,
53: switching element, 54: resistor, 55: capacitor, 56: resistor, 57: insulating switching power supply circuit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02M 7/217 H02M 7/217

Claims (4)

[Claims] 1. A commercial power supply voltage is input to a primary side of a step-down transformer 11, power is converted from the secondary side to a voltage lower than the commercial power supply voltage, and this secondary side AC voltage is converted into a rectifier circuit 1.
A booster chopper circuit 15 having a power factor improving function is provided between the rectifier circuit 12 and the smoothing circuit 13 in a power supply circuit that converts the DC voltage into a DC voltage and outputs the DC voltage. Power supply circuit for gaming machines. 2. A commercial power supply voltage of 100 VAC is input to a primary side of a step-down transformer 11, and power is converted from a secondary side to 24 VAC lower than the commercial power supply voltage.
In a power supply circuit configured to convert a secondary-side AC voltage into a DC voltage by a rectifier circuit 12 and a smoothing circuit 13 and output the DC voltage, a step-up chopper having a power factor improving function between the rectifier circuit 12 and the smoothing circuit 13 A power supply circuit for a gaming machine, comprising: a circuit 15 provided with a voltage of DC 40 V or less as a first converted voltage, and an output of the voltage converted by a non-insulated DC / DC converter. 3. A commercial power supply voltage of 100 V AC is input to the primary side of the step-down transformer 11, and power is converted from the secondary side to 24 V AC lower than the commercial power supply voltage.
In a power supply circuit configured to convert a secondary-side AC voltage into a DC voltage by a rectifier circuit 12 and a smoothing circuit 13 and output the DC voltage, a step-up chopper having a power factor improving function between the rectifier circuit 12 and the smoothing circuit 13 A circuit 15 is provided to obtain a voltage of about 50 V DC as a first converted voltage, and its output is converted to power by an insulated switching power supply circuit 57, and the converted output is converted to power by a non-insulated DC / DC converter. Power supply circuit for gaming machine 4. The step-up chopper circuit 15 includes a reactor 3
5, a rectifying element 36, a switching element 37, a PWM control IC 38, and an output current detecting resistor 56.
The WM control IC 38 amplifies the error by matching the phases of the output voltage signal detected by the output current detecting resistor 56 and the reference voltage signal, compares the error amplified signal with the triangular wave signal, and determines whether the boosting ratio is large or small. 4. The power supply circuit for a gaming machine according to claim 1, wherein the power supply circuit has a function of improving a power factor by obtaining a pulse signal and controlling opening and closing of the switching element 37 by the pulse signal. .