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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a switching circuit diagram of a car stereo
including a conventional switching circuit, and FIG. 2 is a switching circuit diagram of the present
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of switching circuits. For example, as shown in FIG. 1, in the case where one pair of speakers L,
SP and R @ SP are shared by% two car stereoms and B, a switch 71i formula ≦ soching circuit
for switching the speakers In the prior art, what is indicated by the symbol C is conventionally
used. In this circuit, when the relay Y is in the non-moving state, the contact Y '+ 12 is in the state
of the solid line shown, thereby making the speakers L-8P and R-8P into the car stereo B Ma. If
the switch 8W2 of the car stereo B is turned on, the high power of the car stereo B is reproduced
by the speakers L @ SP and R-8P, but if the switch 811h of another car stereo is turned on, the
contact 7 '+ 72 switches to the broken side, and the output of the car stereom is automatically
reproduced by the speaker L-8 P, R and Sh if it is one] ○ Switching of the contact 71172 at this
time is the next It is done in the same way. That is, when the switch SWj of the car stereome is
turned on, the current flowing therethrough is switched to the diode D1. The transistor Q is
shunted via the emitter-base of the transistor Q and the resistors R1 and R2 to turn on the
transistor q, the relay current excites the relay Y, and the contact 71172 switches. However, in
this conventional example, when the power supply + V is like a battery and the voltage includes a
ripple component, when the input voltage to the switching circuit C falls due to the ripple, the car
stereo Since the input electrons of the diode are unable to quickly follow the Linogle voltage
because the charge is stored in the internal power supply filter capacitor Qo, the diode D1 is
reverse-biased and turned off, and at the same time the transistor Q is also turned off, and as a
result, the contacts 71 and 72 of the relay I repeat on and off according to the -ripple frequency,
resulting in an extremely abnormal state. Also, even when the switch 8W2 is turned on and the
car stereom is not operating and the other car stereo B is in operation, the conduction / stop Qo
of the car stereom is rapid via the diode D1 at the peak of the ripple. When charging is
performed, the charge of the capacitor cO is discharged through the resistors Fl + and R2 when
de- charge of the pull-down. Therefore, the transistor Q is turned on at the next charging of the
ripple at the peak of the ripple that will come next. Return to off when charging is complete 9.
Likewise, the transistor q repeatedly turns on and off according to the ripple frequency, resulting
in an abnormal state.
As described above, in the conventional circuit configuration, the switching malfunction occurs
due to the ripple component of the power supply at any time when the switch of any car stereo is
turned on. In addition, when the car's ignition key is turned off, especially when the car stereom
is inoperative, the capacitor Qo of the car stereom applies a voltage higher than the withstand
voltage to the pace emitter of the transistor q and destroys the transistor Q There was also a fear.
Therefore, in the present expert, it is an object of the present invention to provide a switching
circuit which solves the above-mentioned problems by adding some circuit elements. Hereinafter,
with reference to FIG. In the embodiment, the resistor R2 of the switch / dog circuit C in FIG. 1 is
replaced with a diode D2, and a capacitor G1 is inserted between the pace and the collector of
the transistor Q. In this state, when the switch 8W + of the car stereo is turned on / off, the
current there is shunted to the emitter pace of the diode D1 ° transistor Q and the diode D2,
and the transistor q is turned on (however, For example, the diode DjK is a silicon diode, a
germanium diode is used for D2, and a germanium transistor is used for the transistor Q, and the
on condition of the transistor q is satisfied. Then, due to the on state of the transistor Q, the
capacitor C1 connected between the pace and the collector is almost discharged. Here, when the
input voltage drops due to the ripple of the power supply, the input terminal of the car stereom
can quickly follow the ripple voltage because the charge is stored in the capacitor CO for the
internal power supply filter. Also, the diode D1 is reverse biased and is turned off, but at this time
the transistor Q is not turned off simultaneously due to the charging current of the capacitor C1,
and the relay is for the time constant of time off! When the pace current sufficient to excite the
motor is given sufficiently and the switch 8W2 of the car stereo B is turned on to return the
contact F'1F2 to the side of the solid line, the transistor Q is off. If, at this time, a ripple
component appears in the power supply. Due to the presence of the diode p +, D2, the discharge
path of the car stereometic power supply circuit is eliminated, and its capacitor COK keeps the
peak value of the power supply K, and the transistor q does not turn on O Furthermore, the
ignition key Even when turned off, the transistor q is sealed by the diodes p + and D2, and there
is no risk of destruction.
From the above, according to the present invention, the ripple component of the power supply is
not adversely affected, and it has no influence even when the power supply is instantaneously
disconnected by the ignition switch or the like.
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