JP2007014691A - Power supply for pachinko machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect the internal circuit of a Pachinko machine from overvoltage of a power supply voltage possibly occurring due to erroneous connection to an external power supply irrelevant to the timing of a power application. <P>SOLUTION: When applying a power, if a state where the power supply voltage in the feed side is a reference voltage for determining the overvoltage or less is continued for a prescribed time, a transistor Q2 is turned on. The power application is validated after the continuation to protect the internal circuit from the overvoltage of the power supply voltage, irrelevant to the timing of the power application. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is capable of reliably protecting the internal circuit of a pachinko machine with a comparatively simple configuration from an overvoltage of the power supply voltage that may occur due to an incorrect connection to an external power supply, regardless of the timing of turning on the power. The present invention relates to a power supply for a machine.

  Usually, the pachinko machine is supplied with 24 V AC (Alternating Current) (hereinafter referred to as AC) power from an external facility. On the other hand, a rental ball machine installed together with a pachinko machine is supplied with AC 100V power from an external facility. If the AC100V power supply is mistakenly connected to a pachinko machine, there is a risk of damage to the internal circuit of the pachinko machine due to overvoltage.

  For this reason, in Patent Document 1, an overvoltage protection device is provided. Moreover, in patent document 2, such an overvoltage protection apparatus is provided in the middle of the power cord of the pachinko machine.

  For example, FIG. 1 is a circuit diagram of a conventional power supply device for a pachinko machine provided with an overvoltage protection function. FIG. 2 is a time chart showing the operation of the overvoltage protection function during overvoltage.

  In the power supply device for a pachinko machine shown in this figure, power is supplied from an external facility from the left end of the power switch SW1. When the power switch SW1 is turned on, the power supply is rectified into direct current by the diode bridge DB2 in the power supply circuit 20 (first stage from the top of the time chart) and smoothed by the capacitor C. Are supplied to each part inside the pachinko machine.

  The contact of the relay RY1 in FIG. 1 is a so-called A contact that is turned off when the coil is in a non-excited state, and is turned off immediately after the power switch SW1 is turned on. In FIG. 2 and FIGS. 3 and 5 to be described later, the voltage V0 of the alternate long and short dash line is a reference voltage for determining that the power supply voltage of the external equipment is an overvoltage, and the voltage V1 of the two-dotted line is It is a voltage that is higher than the voltage and is likely to damage the internal circuit of the pachinko machine due to overvoltage. The dashed-dotted line voltage V2 is a threshold base voltage at which the transistor Q2 is turned on. The transistor Q2 is turned on at the voltage V2 or higher.

  This pachinko machine power supply device is provided with an overvoltage protection function for determining whether or not the power supply voltage of the external equipment is overvoltage, and only after the power switch SW1 is turned on is not overvoltage, the relay RY1. Will be turned on, and power will be supplied to each part in the pachinko machine. Reference numeral 10 denotes a circuit that realizes an overvoltage protection function, that is, an overvoltage protection circuit, and reference numeral 16 denotes a power supply circuit of the overvoltage protection circuit 10. In the overvoltage protection circuit 10, in particular, reference numeral 12 is an overvoltage determination circuit that determines whether or not the voltage of the power supply of the external equipment is an overvoltage.

  The operation of the overvoltage protection function will be described. The voltage used as the reference for the overvoltage determination is set according to the voltage dividing ratio of the resistor R1 and the resistor R2 and the magnitude of the Zener voltage of the Zener diode ZD1.

  In the power supply circuit 16, when the voltage rectified by the diode bridge DB1 and smoothed by the capacitor Cx is smaller than the overvoltage determination reference voltage, that is, when the voltage of the power supply of the external equipment is not overvoltage, the transistor Q1 The collector and emitter are turned off, the transistor Q2 is turned on, and the current of the coil of the relay RY1 flows to the collector and emitter of the transistor Q2. When the current of the coil flows, the contact of the relay RY1 is turned on, and power is supplied to each part in the pachinko machine.

  On the other hand, when the voltage of the rectification is larger than the overvoltage determination reference voltage, that is, an overvoltage, for example, as shown in the time chart of FIG. For this reason (first and second stages from the top of the time chart), a current flows through the Zener diode ZD1 (third stage from the top of the time chart). Further, the current flows from the base of the transistor Q1 to the emitter, the collector and emitter of the transistor Q1 are turned on, and the collector current of the transistor Q1 also flows (same fourth stage from the top). Then, the base voltage of the transistor Q2 is suppressed by the ON and remains zero (same as the fifth stage from the top), and the collector and the emitter of the transistor Q2 remain OFF, so that the coil of the relay RY1 The current remains interrupted. If the current of the coil remains cut off, the contact of the relay RY1 is off regardless of the power switch SW1 being on, and no power is supplied to each part in the pachinko machine (also from the top 6). Stage). That is, because of the overvoltage, the supply is blocked by the overvoltage protection function.

JP-A-9-285598 Japanese Patent Laid-Open No. 10-112927

  Here, when the operation of the overvoltage protection function is analyzed in detail, the overvoltage protection function does not operate properly depending on the turn-on timing of the power switch. It was found that power was temporarily supplied to each part in the pachinko machine despite the overvoltage. Needless to say, damage to the internal circuit due to overvoltage must be prevented even at a limited timing.

  For example, in the pachinko machine power supply device of FIG. 1, in the time chart of FIG. 3, the voltage of the power supplied from the left end of the power switch SW1 is the same as the time chart of FIG. However, in FIG. 3, the power switch SW1 is turned on at a timing later than that in FIG. 2, specifically, at a time t1 when the AC voltage is low.

  Therefore, a voltage is applied to the base of the transistor Q2 until the voltage of the power source supplied from the left end rises to a voltage determined to be an overvoltage at time t3 (from the top of the time chart of FIG. 3). Stage), the collector and emitter of the transistor Q2 are turned on, the contact of the relay RY1 is turned on, and power is supplied to the interior of the pachinko machine.

  Once the power supply is started, even if an overvoltage occurs from time t3, it is determined as an overvoltage, and therefore, the contact of relay RY1 is turned off again until time t5. Therefore, the discharge of the voltage supplied to the pachinko machine charged in the capacitor C of the power supply circuit 20 is delayed until time t6.

  Therefore, in the case of FIG. 3, power is supplied to the pachinko machine from time t3 to time t5, regardless of overvoltage. In FIG. 3, during the period from time t4 to time t6, the power supply voltage is higher than the voltage indicated by the two-dot chain line, that is, the voltage that increases the risk of damage to the internal circuit of the pachinko machine due to overvoltage. .

  The present invention has been made to solve the above-mentioned conventional problems, and compares the internal circuit of the pachinko machine from the overvoltage of the power supply voltage that may occur due to incorrect connection to an external power supply regardless of the timing of power-on. It is an object of the present invention to provide a power supply device for a pachinko machine that can be reliably protected with a simple configuration.

  The present invention provides a power supply device for a pachinko machine that is provided in a path of an AC power supply supplied from an external facility to the inside of the pachinko machine and supplies the power to each part inside the pachinko machine. The above-described problem is solved by enabling the power-on after the state where the voltage of the power source is equal to or lower than the reference voltage for determining the overvoltage continues for a specified time.

  Furthermore, in the power supply device for the pachinko machine, the reference voltage is changed again after the power supply voltage that changes at an alternating cycle of the power supply that may be supplied as an overvoltage for the specified time becomes equal to or lower than the reference voltage. The problem is solved by setting the time longer than the period up to the above.

  The operation of the present invention will be briefly described below.

  In an AC power supply, the voltage changes at a predetermined cycle of 50 Hz or 60 Hz. Therefore, even if the power supply voltage becomes an overvoltage, or in the case of alternating current, the execution value or the peak value is an overvoltage, there is a timing of a voltage that periodically falls below the reference voltage of the overvoltage.

  For this reason, in the present invention, at the time of power-on, the power-on is validated after a state in which the voltage of the power supply on the supply side is equal to or lower than the reference voltage for determining overvoltage continues for a specified time. Therefore, the internal circuit of the pachinko machine can be reliably protected with a comparatively simple configuration from an overvoltage of the power supply voltage that may occur due to an erroneous connection to an external power supply, regardless of the timing of power-on.

  Here, the specified time may be equal to or longer than the time during which the overvoltage protection function operates appropriately regardless of the timing when the power switch is turned on.

  For example, in a power supply device for a pachinko machine, an AC 24V power supply is originally supplied from an external facility power supply, whereas an AC 100V power supply such as a rental machine installed together with the pachinko machine may be erroneously connected. . Therefore, in the case of the erroneous connection of the AC 100V power source, this should be detected reliably so that the power is not supplied to the internal circuit of the pachinko machine. Accordingly, until the power supply voltage that may be supplied as an overvoltage for the specified time is changed below the reference voltage of the present invention from the time when the power supply voltage that changes in the AC cycle becomes equal to or higher than the reference voltage. It may be longer than this period.

  For example, specifically, when the power supply voltage is an overvoltage that is slightly higher than the reference voltage for determining the overvoltage, the overvoltage is only in the vicinity of the peak timing. Further, the period in which the overvoltage is not more than the reference voltage is close to the longest (1/2) period of the alternating current. Therefore, it is considered sufficient that the specified time is at least (1/2) period.

  If the voltage difference between the overvoltage and the reference voltage for determining the overvoltage is thus small, the period during which the overvoltage is determined to be equal to or less than the reference voltage is lengthened. Or if this voltage difference is large, the period of the state which is below the reference voltage which determines overvoltage will become short.

  Specifically, in the case of a power supply device for a pachinko machine, the overvoltage is originally AC100V at AC24V. Therefore, when AC100V is supplied by mistake and the reference voltage is set to 24V, the power supply that changes in this AC cycle The specified time of the present invention may be made longer than the period in which the voltage is continuously 24 V or less.

  Here, the voltage of the AC 100V power supply is expressed by the following equation (1). The reference voltage of the present invention is 24V. Then, θd at the timing when it becomes equal to the reference voltage is expressed by equation (2). This θd is, for example, −13.89 ° or + 13.89 °.

  Accordingly, when full-wave rectification is assumed as in the embodiment described later, the period when the reference voltage is lower than the reference voltage is, for example, continuously 24V or lower (θ = −13.89 °) to (θ = + 13.89 °). The length of the period is about 77 mS for 50 Hz alternating current, about 64 mS for 60 Hz alternating current, and is about (1/6) period in that period. Therefore, the specified time of the present invention may be designed to be longer than the length of such a period.

Power supply voltage = 100 × sin θ (unit: V) (1)
θd = sin ⁻¹ (24/100) (2)

  Therefore, if the specified time is shorter than the time determined as described above, the overvoltage protection function operates appropriately regardless of the timing of turning on the power switch.

  Therefore, the pachinko machine can reliably protect the internal circuit of the pachinko machine with a comparatively simple configuration from the overvoltage of the power supply voltage that may occur due to incorrect connection to the external power supply, etc., regardless of the power-on timing. A power supply device can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 4 is a circuit diagram of the periphery of a portion to which the present invention is applied of the power supply device for a pachinko machine according to the first embodiment to which the present invention is applied.

  In the present embodiment, a timer circuit (timer circuit) 14 configured by resistors R5 and R6 and a capacitor C1 is configured at the output of the overvoltage determination circuit 12. The set time T or delay time T of the timer circuit is as follows.

      T = −C1 × (R3 + R5) × LN (1-VBE / VCC)

  Here, VBE is a base-emitter voltage of the transistor Q2, VCC is a voltage of a power source supplied from the power supply circuit 16 after being rectified and smoothed, and LN () is a logarithmic function.

  FIG. 5 is a time chart showing the operation of the present embodiment.

  In this time chart, the power switch SW1 is turned on at the same timing as in FIG. 3 described above, which malfunctions in the conventional example of FIG. 1, that is, at time t1 when the AC voltage is low.

  Even in such a case, the base voltage of the transistor Q2 does not rise immediately by the timer circuit 14 (fifth stage from the top of the time chart of FIG. 5). Accordingly, since the collector and the emitter of the transistor Q2 remain off, the coil current of the relay RY1 remains cut off. If the current of the coil remains cut off, the contact of the relay RY1 is off regardless of the power switch SW1 being on, and no power is supplied to each part in the pachinko machine (also from the top 6). Stage). That is, the overvoltage protection function works properly, and the supply is blocked due to the overvoltage.

  FIG. 6 is a circuit diagram around a portion to which the present invention is applied of the power supply device for a pachinko machine according to the second embodiment to which the present invention is applied.

  In the present embodiment, a Zener diode ZD3 is added to the timer circuit 14 of the first embodiment. As a result, the operation of the timer circuit 14 becomes strict.

  FIG. 7 is a circuit diagram around a portion to which the present invention of the power supply device for a pachinko machine of the third embodiment to which the present invention is applied is applied.

  In the present embodiment, the overvoltage determination circuit 12 and the timer circuit 14 are configured using an IC (Integrated Circuit).

  That is, first, the overvoltage determination circuit 12 uses a so-called reset IC 1 as a comparator for determining overvoltage. If it is an overvoltage, the reset IC 1 outputs an L state. Next, the timer circuit 14 uses the timer IC 2 in which the specified time of the present invention is set. The timer IC 2 outputs an H state after the specified time from when the power supply circuit 16 starts to supply power. When the output of the reset IC1 is in the H state and the output of the timer IC2 is in the H state, the resistors R8 to R10 constitute an AND circuit, so that the collector and emitter of the transistor Q2 are connected to the base of the transistor Q2. A voltage sufficient to turn on the relay RY1 is applied, and the contact of the relay RY1 is turned on by the application.

  As described above, according to the first to third embodiments, the present invention can be applied effectively.

  As described above, according to the present invention, the internal circuit of the pachinko machine can be reliably and comparatively configured from the overvoltage of the power supply voltage that may be caused by incorrect connection to the external power supply regardless of the power-on timing. A power supply device for a pachinko machine can be provided.

The circuit diagram of the conventional power supply device for pachinko machines provided with an overvoltage protection function. The time chart which shows operation | movement of this overvoltage protection function at the time of an overvoltage. The time chart at the time of malfunction of this overvoltage protection function at the time of overvoltage. The circuit diagram of the periphery of the part to which this invention was applied of the power supply device for pachinko machines of 1st Embodiment to which this invention was applied. The time chart corresponding to FIG. 4 which shows operation | movement of the said embodiment. The circuit diagram of the periphery of the part to which this invention was applied of the power supply device for pachinko machines of 2nd Embodiment to which this invention was applied. The circuit diagram of the periphery of the part to which this invention was applied of the power supply device for pachinko machines of 3rd Embodiment to which this invention was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Overvoltage protection circuit 12 ... Overvoltage determination circuit 14 ... Timer circuit 16, 20 ... Power supply circuit Q1, Q2 ... Transistor ZD1-ZD3 ... Zener diode DB1, DB2 ... Diode bridge Cx, C, C1 ... Capacitor R1-R10 ... Resistance IC1 ... Reset IC
IC2 ... Timer IC

Claims (2)

In a power supply device for a pachinko machine provided in an AC power supply path that is supplied from an external facility to the inside of the pachinko machine, rectifies the power, and supplies it to each part inside the pachinko machine.
A power supply device for a pachinko machine, wherein the power-on is made valid after a state in which the voltage of the power source is equal to or lower than a reference voltage for determining an overvoltage continues for a specified time when the power is turned on. In the power supply device for pachinko machines according to claim 1,
The specified time is longer than the period from when the power supply voltage, which is likely to be supplied as an overvoltage, that changes in the AC cycle becomes equal to or higher than the reference voltage after being lower than the reference voltage. A power supply device for a pachinko machine characterized by the above.

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