JP2782511B2 - Overcurrent protection circuit for pachinko machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A pachinko machine is provided with a large number of lamps on a panel surface, and a solenoid valve for operating an accessory is provided inside. The game must be interrupted if other parts are affected due to an abnormal state or breakage of a specific load such as these lamps and solenoid valves. The present invention relates to an overcurrent protection circuit of a pachinko machine for preventing so-called secondary damage.

[0002]

2. Description of the Related Art Lamps (incandescent light bulbs) used in pachinko machines are excellent display means in terms of high brightness and economical efficiency, and are indispensable for enhancing their playability. An indicator with a lamp is attached to the camera, and its advantages are fully demonstrated. For example, there are a lamp that lights up when the ball is fired by gripping the grip, a lamp that lights up when the accessory is in operation, and the like, which are installed in a translucent colored plastic cover on the board surface.
In order to improve the effects of these lamps and to arrange them in a narrow space, various measures have been taken to prevent physical damage due to interference with peripheral components.

[0005] Electrically, circuit designs as shown in FIGS. 7 and 8 have been made. In FIG. 7, a resistor R1 is connected in parallel with the transistor TR1 in the output stage, and a lamp L1 is connected in series to one end of the resistor. When the light is turned off, a slight current determined by the resistor R1 flows to weakly heat the filament. In this case, the resistance value of the filament is suppressed from being lowered, and the instantaneous current when the switch is turned on is suppressed. As shown in FIG. 8, a method of limiting the instantaneous current by connecting a transistor Tr2, a resistor R2, and a lamp L2 in series is used.

[0004]

However, in the electric circuit shown in FIG. 7, a current always flows through the lamp L1, so that when the number of lamps and the number of pachinko machines are large, the power consumption is enormous. Become. Also, this resistor R1
It is necessary to select a resistance value of high resistance,
We need experiments and data to determine this resistance,
Effort and time are spent for this. And the lamp L
Even when 1 is short-circuited, almost no current flows through the resistor R1, and an overcurrent flows through the transistor Tr1, thereby destroying the transistor Tr1.
In the case of the electric circuit shown in FIG. 8, the resistance value of the resistor R2 needs to be small so as not to affect the brightness of the lamp L2. In this case, too, an experiment for determining this resistance value,
It requires data and effort and time is spent on this. Further, the efficiency of the lamp control circuit is poor due to the resistance R2, which is not preferable.

[0005] As described above, the conventional driving method has a problem in that the surrounding environment and the number and characteristics of the driven lamps each time,
In the worst case, if an overcurrent flows and the fuse of the power supply blows, the settings must be readjusted even if the pachinko machine is restarted. And the adjustment of the protection circuit against the load short circuit was very complicated.

An object of the present invention is to provide an overcurrent protection circuit of a pachinko machine for facilitating maintenance and preventing interruption of a game when a specific load described as an example of the lamp fails. With the goal.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an output control circuit comprising a drive section for supplying a current to a specific load of a pachinko machine and a control section for operating the drive section by a drive signal. A current detection circuit for detecting an overcurrent of the specific load and outputting a predetermined detection signal, connecting an input terminal of an output stop circuit to an output terminal of the current detection circuit, A flip-flop circuit for receiving an output and a signal for canceling the stop state of the control unit; providing an output terminal of the flip-flop circuit to the control unit; When a stop signal is output to the circuit, the control unit is caused to stop by the flip-flop circuit.

In the above configuration, a lamp will be described as an example of a specific load. In general, a control unit and a driving unit operate by a signal for operating the lamp, and current is supplied to the lamp. At this time, if the filament breaks due to external force such as vibration or life, etc., depending on the mounting direction of the lamp, the broken filament portion becomes entangled with the root of the filament support wire, resulting in a short circuit state. As a result, an overcurrent flows through the driving unit and the lamp.

Therefore, in order to detect the overcurrent and stop the output control circuit, the overcurrent is detected by the current detection circuit, whereby a stop signal is output from the output stop circuit and input to the flip-flop circuit. The flip-flop circuit sends a stop signal to the control unit of the output control circuit and keeps the state. Therefore, since the drive unit does not operate, no current flows and the overload of the power unit is prevented. After that, even if the lamp is replaced and the lamp becomes normal, the driving unit does not operate. However, by inputting a signal to the flip-flop circuit, the control unit returns, the output control circuit operates, and the lamp is turned on again.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 6, indicators 2 and 3 are mounted on the board of the pachinko machine 1, and a lamp (specific load) driving device for lighting these is provided with an overcurrent protection circuit.

A first embodiment will be described with reference to FIGS. In FIG. 1, a lamp driving device includes an output control circuit 5.
Are provided, and the output control circuit 5 includes a control unit 6 and a drive unit 7. The control unit 6 and the drive unit 7 include a current detection circuit 8 for detecting a current of the drive unit 7 and an output for stopping the function of the control unit 6 based on a detection signal output from the current detection circuit 8. The stop circuit 9 is connected, and a clock input circuit (flip-flop circuit) 10 for activating the control unit 6 is connected to the output stop circuit 9. Further, an overvoltage protection circuit 11 for preventing overvoltage from being applied to the driving unit 7 is added. Further, a voltage detection circuit 12 for detecting a lamp voltage may be provided.

The overcurrent prevention circuit shown in FIG. 2 uses a general-purpose IC. In this circuit, an output control circuit 5 includes a control IC (Z1) and a transistor Tr8, and a detection IC (Z2) for detecting a potential is connected to a resistor R6 connected to the transistor Tr8. Obtained from R7 and R8. Also, the transistor Tr8
Is connected to a diode D1 and a lamp L4 so that current is supplied through the lamp L4. The output of the detection IC (Z2) is input to one end of the protection IC (Z3) of the flip-flop and wired so as to be input to the control IC (Z1). A positive pulse is input to the clock input terminal at the other end of the protection IC (Z3) to operate.

In this circuit, the lamp L4 is normally turned off when the lamp input is at the L potential. At this time, the potential of the resistor R6 is within the specified range, the detection signal becomes the L potential, and the control IC
(Z1) is a standby state. Next, when the lamp input goes to the H potential, the output of the control IC (Z1) goes to the H potential, turning on the transistor Tr8 to turn on the lamp L4.

In this circuit, when the lamp L4 fails and an overcurrent flows, the detection signal becomes the H potential due to the change in the potential of the resistors R6 and R7, and the output of the protection IC (Z3) becomes the L potential, forcibly. The output of the control IC (Z1) to L
Potential. Then, when the lamp L4 is replaced, the detection signal becomes the L potential again. However, the control IC (Z1) remains stopped unless a pulse is input to the other end of the protection IC (Z3). Control IC (Z
1) enters a standby state.

In such a circuit, the operation is stopped until the cause of the failure is eliminated, so that there is sufficient time and workability is improved. When the lamp L4 as a specific load is replaced, power supply from the output control circuit Tr8 to the lamp L4 is stopped, but power supply to the entire pachinko machine 1 is not stopped.

FIGS. 4 and 5 (a) and 5 (b) show elements which are effective in mounting. Since this circuit is equivalent to that of the first embodiment, the same reference numerals are given to those having the same functions. The size is _{about, l 1 = 51mm, h 1} = 29mm, d
₁ = 7.5 mm, which is effective in narrow places.

FIG. 3 is a circuit diagram in the case of being mounted on a pachinko machine. This circuit uses a D flip-flop circuit, and the control unit is provided with this composite element (control IC (Z4)). Similarly, a plurality of transistors Tr9, a resistor R9, a lamp L5, and a diode D2 are arranged in the drive unit. A plurality of diodes D3 are connected in a wired OR manner from the output portions of the plurality of resistors R9, and are connected to the base of the transistor Tr10. The detection signal of the transistor Tr10 is wired so as to be input to the R terminal (reset end) of the control IC (Z4). In this embodiment, any one of the plurality of lamps L5 is used.
If any short circuit occurs, or when an overcurrent flows, the drive units of all circuits stop.

As described above, in the embodiment, the overcurrent is prevented in the lamp drive circuit. However, the addition of the overvoltage prevention circuit such as the diode D1 enables the inductive load such as a motor or a solenoid as a specific load. Can respond.

[0019]

As described above, the present invention is configured as described above. Therefore, when an overcurrent occurs at the output terminal, the stop signal to the control unit is stably supported by the flip-flop circuit, and the switching loss is minimized. While suppressing, the output control circuit is shut off for a certain period in a stable form without chattering,
It can prevent overheating and prevent overheating. Also, taking a lamp as an example of a specific load, the design here is easy if the sum of the ratings of the lamp is within the rating of the output control circuit.
Further, since the overcurrent due to the short-circuit state is eliminated, generation of unnecessary heat can be suppressed. Furthermore, it can be mounted at low cost by using a general-purpose IC and maintenance is easy. Furthermore, when an overcurrent flows to a specific load, the power supply is stopped only at this point, and there is no effect on other parts of the pachinko machine, so that the game of the pachinko machine is not interrupted.

[Brief description of the drawings]

FIG. 1 is a block diagram of an overcurrent protection circuit of a pachinko machine according to the present invention.

FIG. 2 is a circuit diagram of the configuration shown in FIG.

FIG. 3 is a circuit diagram of a mounting example of the configuration shown in FIG. 1;

FIG. 4 is a circuit diagram of an element including the circuit configuration of FIG. 1;

FIG. 5 is a schematic view of a front (a) and a side (b) of an element including the circuit shown in FIG.

FIG. 6 is a front view of the pachinko machine according to the present invention.

FIG. 7 is a circuit diagram of a conventional pachinko machine lamp overcurrent prevention.

FIG. 8 is an overcurrent prevention circuit diagram of another lamp of the conventional pachinko machine.

[Explanation of symbols]

 Reference Signs List 5 output control circuit 8 current detection circuit 9 output stop circuit 10 clock input circuit L4 lamp

Claims (1)

(57) [Claims] 1. An output control circuit comprising: a drive unit for supplying a current to a specific load of a pachinko machine; and a control unit for operating the drive unit in accordance with a drive signal. A current detection circuit for outputting the detection signal of the current detection circuit, an input terminal of the output stop circuit being connected to an output terminal of the current detection circuit, and a flip-flop receiving an output of the output stop circuit and a signal for releasing a stop state of the control unit. A circuit is provided, and an output terminal of the flip-flop circuit is connected to the control unit. When a stop signal is output to the output stop circuit by an output of the current detection circuit that detects an overcurrent, the flip-flop circuit An overcurrent protection circuit for a pachinko machine, wherein the control unit is stopped.