JPH09313675A - Solenoid driving circuit for motor-driven type game machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a circuit at a low price and to stably drive a solenoid by providing a fuse resistor so as to be electrically serial to a smoothing capacitor and the solenoid. SOLUTION: For this solenoid driving circuit, the fuse resistor R1 is provided so as to be electrically serial to the smoothing capacitor C1 and the solenoid SL. The fuse resistor R1 is provided with a current limiting function in the case of applying an excessive voltage and fuses itself and prevents a fire accident by the burning of the solenoid SL, a solenoid driving transistor Q1 and rectification diodes D1 -D4 , etc., in the case that impressed pulse time becomes abnormally long for some causes. Also, in the case of controlling the pulse time and adjusting ball hitting force, a driving signal voltage inputted to the transistor Q1 is a fixed value at all times since it is generated by a control circuit 3 and the transistor Q2 for solenoid driving connected to a constant voltage power source by a constant voltage circuit 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid drive circuit, in particular, a solenoid (including a plunger solenoid, a rotary solenoid, etc.) is intermittently supplied with a pulsed current, and the electromagnetic force thereof is used to drive a mover. Then, for example,
The present invention relates to a solenoid drive circuit suitable for an electric game machine that shoots balls such as a pachinko machine, a smart ball machine, and a pinball machine.

[0002]

2. Description of the Related Art In a solenoid drive circuit for an electric game machine, an excessive peak charging current of an AC power source is limited, and a pulse time applied to the solenoid (excitation applied to the solenoid due to failure of the solenoid drive circuit or parts). It is necessary to provide a power supply protection circuit in order to prevent a fire accident due to burning of the solenoid, the solenoid drive transistor, the rectifying diode, etc. when the current-carrying time is abnormally long.

Therefore, as a conventional solenoid driving circuit for an electric game machine, as shown in FIG. 2, a charging current limiting resistor R ₀ and a smoothing capacitor C ₁ and a solenoid SL are arranged so as to be electrically in series. Some fuses F are provided to limit the charging current and protect the AC power supply from overcurrent. This solenoid drive circuit is AC24
The AC power source 1 of V is rectified via the fuse F and the current limiting resistor R ₀ to the rectifying circuit 2 including the diodes D ₁ , ..., D ₄ , and the smoothing capacitor C ₁ is charged with the rectified voltage. The charged DC voltage is applied to the transistor Q ₁ ,
It is used as a power source for Q ₂ and control circuit 3. When a pulse signal (ball hitting signal) is output from the control circuit 3, the transistor Q ₂ is turned on, and accordingly, the base of the transistor Q ₁ becomes high due to the divided voltage of the resistors R ₂ and R ₃ .
The transistor Q ₂ also turns on, and a drive current flows through the solenoid SL.

[0004]

In the above-mentioned conventional solenoid drive circuit, a resistor having a large rated power is required as the charging current limiting resistor, which is expensive in itself and further has a fuse. It is expensive as a whole. In a solenoid drive circuit for an electric game machine, a large amount of current is consumed for the movement of the moving element. This is a big problem especially in pachinko halls where dozens to hundreds of game machines are used. In particular, when the AC voltage rises, the current flowing through the solenoid also increases, which increases the current consumption as a whole.

Further, when the AC voltage changes, the current flowing through the solenoid changes accordingly, and the hitting force also changes. It is not preferable for a game machine that the hitting force changes according to the voltage change. There are problems such as. The present invention has been made in view of the above problems, and an object thereof is to provide a solenoid drive circuit which can realize circuit protection at a low cost and can stably drive a solenoid.

[0006]

A solenoid drive circuit of an electric game machine according to claim 1 of the present application receives a rectification circuit for rectifying an AC voltage and a rectification voltage of the rectification circuit. A smoothing capacitor that is charged to obtain a DC voltage, and a drive circuit that drives a solenoid by using the DC voltage charged in the smoothing capacitor as a main power source, so that the smoothing capacitor and the solenoid are electrically connected in series. A fuse resistor is installed in the fuse to limit the excessive peak charging current of the AC power supply, and when the pulse time applied to the solenoid is abnormally long, this fuse resistor is automatically blown, and the solenoid, solenoid drive transistor, and rectifier Prevent accidents such as burning of diodes.

A solenoid drive circuit for an electric game machine according to a second aspect of the present invention includes a rectifier circuit for rectifying an AC voltage, a smoothing capacitor for receiving a rectified voltage of the rectifier circuit to charge a rectified voltage, and a DC voltage. A drive circuit that drives the solenoid using the DC voltage charged in the capacitor as the main power source,
In order to protect against excessive current and to prevent hitting force from depending on the AC voltage, set the solenoid so that only a specified current flows through the solenoid and AC power supply even if the AC voltage increases significantly. Driven by a current circuit.

[0008]

1 is a circuit diagram showing a circuit configuration of a solenoid drive circuit for an electric game machine according to an embodiment of the present invention. In this solenoid drive circuit for an electric game machine, an AC power supply 1 is connected via a fuse resistor R ₁ to a rectifier circuit 2 composed of diodes D ₁ , D ₂ , D ₃ and D ₄ . The fuse resistor R ₁ has a resistance value of about 10Ω and functions as a current limiter for the application of an excessive AC voltage or the charging current limit of the capacitor, protecting the AC power supply unit and the circuit unit, and If the current flows for a long period of time, it blows itself to protect other circuits.

A smoothing capacitor C ₁ is connected between the output terminals a and b of the rectifier circuit 2. The collector of the driving transistor Q ₁ is connected to the point a of the rectifier circuit 2, and the emitter is connected to one end of the parallel circuit of the diode D ₅ and the solenoid SL. The other end of the parallel circuit is grounded (rectifier circuit 2
Point b)). Further, a point of the rectifier circuit 2 is connected to the anode of the diode D _6, the cathode of the diode D ₆ is connected to a constant voltage circuit 4. The voltage across the smoothing capacitor C ₁ is converted to a constant voltage by the constant voltage circuit 4, the capacitors C ₂ and C ₃ , and supplied as the power supply voltage for the transistor Q ₂ and the control circuit 3. A series circuit of a transistor Q ₂ and a resistor R ₂ is connected between the output terminal of the constant voltage circuit 4 and the ground potential, and the connection point is connected to the base of the transistor Q ₂ .

In the solenoid drive circuit of this embodiment, the AC voltage is rectified by a rectifier circuit 2 including diodes D ₁ , ..., D _4.
The rectified voltage is charged by the smoothing capacitor C ₁ and converted into a DC voltage. Since the fuse resistor R ₁ is provided so as to be electrically in series with the smoothing capacitor C ₁ and the solenoid SL, when an excessive current flows through the solenoid SL, an excessive current also flows through the fuse resistor R ₁ . Further, in the transistor Q1, the collector is connected to this rectified power source, the emitter is connected to the solenoid SL,
The solenoid SL is driven according to a signal that is included in the emitter follower circuit (constant current circuit) and is input to the base from the control circuit 3 connected to the constant voltage circuit 4.

In the solenoid drive circuit of this embodiment,
At this time, the AC voltage from AC24V AC power supply 1 is
Resistance R₁Is added to the rectifier circuit 2 via
And the rectified voltage is the smoothing capacitor C₁Is charged to
You. The current at this time is the fuse resistor R₁Fusing
Does not reach. A pulse signal from the control circuit 3, that is, a hit ball
When a signal is applied, the transistor Q _TwoTurns on and responds
Transistor Q₁Also turned on, smoothing capacitor C₁No electricity
Transistor Q due to pressure₁, Pulse to solenoid SL
An instantaneous current flows by the solenoid, and the solenoid repels the mover.
By this, the ball is fired.

The fuse resistor R ₁ has a current limiting function when an excessive voltage is applied, and when the pulse time applied for some reason becomes abnormally long, the fuse resistor R ₁ is blown by itself and the solenoid SL , solenoid driver transistor Q _1, the rectifier diode D _1, ..., to prevent fire accident caused by burning, such as D _4. When adjusting the hitting force by controlling the pulse time, the drive signal voltage (current) input to the transistor Q ₁ is the control circuit 3 for driving the solenoid connected to the constant voltage power source by the constant voltage circuit 4 and the transistor. It is always constant because it is generated by Q ₂ .
Further, since the transistor Q ₁ constitutes an emitter follower circuit, the current flowing through the solenoid SL becomes constant regardless of the voltage change of the smoothing capacitor C ₁ (voltage of the AC power supply). Therefore, even if the AC voltage changes, only a predetermined current flows through the solenoid SL and the AC power supply. Also, the hitting force is not affected by the change in the AC voltage.

Although the above embodiment is an example in which the pulse time is controlled to adjust the hitting force, a method of adjusting the hitting force by controlling the driving pulse value with a constant pulse width is also possible. Similar to the above, the emitter follower circuit can be used for driving without depending on the change in the power supply voltage.

[0014]

According to the invention of claim 1 of the present application, since the fuse resistor is provided so as to be electrically connected in series with the smoothing capacitor and the solenoid,
Since it is not necessary to provide the charging current limiting resistor and the fuse, it is possible to reduce the cost and size. Further, according to the invention of claim 2, since the solenoid is driven by the constant current circuit, only a predetermined current flows through the solenoid and the AC power supply even if the AC voltage greatly rises, and protection from an excessive current is provided. The current consumption does not increase. Further, since the hitting force does not depend on the AC voltage, a constant hitting force can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit configuration of a solenoid drive circuit for an electric game machine according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit configuration of a conventional solenoid drive circuit for an electric game machine.

[Explanation of symbols]

1 AC power supply 2 Rectifier circuit 3 Control circuit SL solenoid C ₁ Smoothing capacitor Q ₁ Drive transistor Q ₂ Constant current source transistor R ₁ Fuse resistor

Claims (2)

[Claims] 1. A rectifier circuit for rectifying an AC voltage, a smoothing capacitor for receiving a rectified voltage of the rectifier circuit to charge and obtaining a DC voltage, and a solenoid using a DC voltage charged in the smoothing capacitor as a main power source. A solenoid drive circuit for an electric game machine, comprising a drive circuit for driving, wherein a fuse resistor is provided so as to be electrically in series with the smoothing capacitor and the solenoid. . 2. A rectifier circuit for rectifying an AC voltage, a smoothing capacitor for receiving a rectified voltage of the rectifier circuit to charge it to obtain a DC voltage, and a solenoid whose main power source is the DC voltage charged in the smoothing capacitor. A solenoid drive circuit for an electric game machine, comprising: a drive circuit for driving; a solenoid drive circuit for the electric game machine, wherein the drive circuit for the solenoid is driven by a constant current circuit.