JP2506970Y2 - Ton ringer power supply circuit - Google Patents

Description

[Detailed description of the device]

[0001]

The present invention is connected to a telephone line,
The present invention relates to a tone ringer power supply circuit that can store electric power in a capacitor when a telephone is on standby and generate a large acoustic output when an incoming bell signal is generated.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, the power supplied to a tone ringer sound generating IC is divided by a capacitor C4 into an AC component of an incoming bell signal superimposed on a direct current of a telephone line, and via a resistor R4. It is obtained by rectifying with the diode bridge DB2 and smoothing with the capacitor C5 and the Zener diode ZD3.

[0003]

In the above conventional example, electric power is obtained only from the incoming bell signal, and when the tone ringer sound generating IC is driven with such limited electric power, a large acoustic output can be obtained. It was difficult.

Further, in this type of circuit, in order to generate a large tone ringer sound, an external power supply must be provided separately, and there is a problem that handling in use becomes complicated. In addition, an external power source is mainly obtained from a power line, and in this type of circuit that requires constant power supply, it is necessary to take measures against a power failure or the like.

The present invention has been made in view of the above problems, and its purpose is to supply electric power only by a station power supply of a telephone line and a call incoming call bell signal from the station without receiving power supply from an external power supply. To provide a tone ringer power supply circuit.

[0006]

SUMMARY OF THE INVENTION The tone ringer power supply circuit of the present invention uses a tone ringing signal to generate a tone ringer.
The tone ringer sound is generated by supplying power to the gar sound generation circuit.
In the tone ringer power supply circuit to generate
The incoming bell signal connected to the line terminal and superimposed on the DC voltage
Signal output that aligns the polarity of the AC voltage of the signal
And the output of the diode bridge,
A capacitor that is charged to the telephone line voltage during talk standby,
The diode bridge and the capacitor and the tone
An electronic switch provided between the singer sound generation circuit and
Connected to the diode bridge, the incoming bell signal
If the occurrence of the incoming call bell signal is detected,
The diode bridge is turned on by turning on the electronic switch.
And connect the capacitor to the tone ringer sound generation circuit.
Control the detection circuit that supplies power and the electronic switch.
The tone ringer sound generation circuit by converting the voltage to be performed into a constant voltage
Voltage applied to the tone ringer sound generation circuit
Constant voltage circuit, which prevents
Things.

[0007]

In the tone ringer power supply circuit of the present invention, the detection circuit detects when an incoming bell signal is generated.
The electronic switch to the on state and the diode bridge
And power is supplied from the capacitor to the tone ringer sound generation circuit . The capacitor is charged to the same voltage as the line voltage when the telephone is on standby, and is charged so as to supplement the power consumed when the incoming bell signal is generated. Therefore, instead of driving the tone ringer sound generation circuit using only the limited power that uses the incoming bell signal as the power, it is driven by the abundant power stored in the capacitor and the shortage is controlled when the incoming bell signal is generated.
Since it is replenished even if it is present, it is possible to generate a loud sound. In addition, the tone ringer sound generation circuit has
It is possible to apply the previous voltage, but at that time,
A constant voltage circuit is installed so that a voltage exceeding the pressure is not applied.
The control voltage of the electronic switch is made constant and the electronic switch
The voltage applied to the tone ringer sound generation circuit via
Configure it so that it has a stable voltage that does not exceed its withstand voltage.
I have. Therefore, the line voltage, the voltage of the incoming bell signal and the
Fully utilize the output voltage of the capacitor
Voltage can be supplied to the tone ringer sound generation circuit.
Wear.

[0008]

1 is a circuit diagram showing a circuit configuration of a tone ringer power supply circuit according to an embodiment of the present invention.

L1 and L2 are telephone lines of station line terminals,
48V DC voltage is supplied during normal telephone standby,
When a ringing bell signal is generated, an AC voltage of 75 V is superimposed on the standby voltage.

The diode bridge DB1 is connected to the line terminal L.
1, L2, and outputs a voltage signal of a constant polarity from its output end.

The current limiting resistor R1 is connected to the output end of the diode bridge DB1. The current limiting resistor R1 is provided to prevent the charging current of the capacitor, which will be described later, from operating the relay of the telephone office at the peak value of the incoming bell signal.

The capacitor C1 is a diode bridge D
It is connected to the output terminal of B1 via a resistor R1 and is charged to the telephone line voltage when waiting for a call.

The electronic switch Q is composed of a transistor, the collector of which is a capacitor C1 in this embodiment.
The emitter is connected to the tone ringer sound generation IC. The threshold of the transistor is set above the line voltage and the diode bridge DB
A detection circuit that conducts when an incoming bell signal is generated at the output end of 1.
Protects Zener diode ZD1 and base as a path
Current limiting resistor R2, a capacitor C2 for smoothing the pulsating current of the incoming bell signal, and a threshold value for suppressing the base voltage from gradually rising due to the incoming bell signal .
Constant voltage set to the breakdown voltage of the Ringinger sound generation IC
Zener diode ZD2 as a circuit and resistor R that discharges capacitor C2 at the same time when the incoming bell signal is generated
3 are connected to stabilize the current and voltage applied to the base.

In the tone ringer power supply circuit having the above configuration, when the telephone is on standby, the capacitor C1 is charged to the line voltage, and when the incoming bell signal is generated, the Zener diode ZD1 is turned on and the electronic switch Q is turned on, and the tone is turned on. Power is supplied to the ringer sound generation IC from the incoming bell signal and the capacitor C1. At this time, the voltage applied to the base of the electronic switch Q becomes as shown in FIG.
become.

Further, the base voltage when the incoming bell signal is generated is the tone ringer sound by the Zener diode ZD2.
The voltage is made constant so as not to exceed the withstand voltage of the generated IC, and the pulsating current generated near the maximum value of the voltage waveform is smoothed by the capacitor C2.

The capacitor C1 is charged by the consumed amount even while the incoming bell signal is generated, and is repeatedly discharged and charged.

Further, the capacitance of the large-capacity capacitor C1 is set in consideration of the insulation resistance at the time of waiting for a telephone, which is defined by law.

[0018]

According to the present invention, a higher voltage can be supplied to the tone ringer sound generating IC as compared with the conventional example by using the electric power of the capacitor C1 which has been charged when the telephone is on standby. Furthermore, it is possible to set it so that the withstand voltage of the tone ringer sound generation IC is not exceeded .
Thus, it is possible to generate a stable output voltage close to the breakdown voltage by fully utilizing the line voltage and the like . In particular, even if the same tone ringer sound generation IC as the conventional one is used, it is possible to generate several times the sound, and by using the tone ringer sound generation IC having high withstand voltage, it is possible to generate a larger sound. You can

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit configuration of a tone ringer power supply circuit according to an embodiment of the present invention.

FIG. 2 is a diagram showing a waveform of a base voltage of the electronic switch shown in FIG.

FIG. 3 is a circuit diagram showing a circuit configuration of a conventional tone ringer power supply circuit.

[Explanation of symbols]

 DB1 Diode bridge R1, R2, R3 Resistance Q Electronic switch C1, C2 Capacitor ZD1, ZD2 Zener diode

Claims (1)

(57) [Scope of utility model registration request] 1. A tone ringer upon generation of an incoming bell signal.
-Power is supplied to the sound generation circuit to generate a tone ringer sound.
In the tone ringer power supply circuit, the incoming call is connected to the telephone line terminal and superimposed on the DC voltage.
A diode that outputs with the polarity of the AC voltage of the bell signal aligned.
Connected to the output end of the diode bridge and the diode bridge and waiting for a call
To the telephone line voltage, the diode bridge and the capacitor and the tone
An electronic switch provided between the singer sound generating circuit and the diode bridge,
If the occurrence of the incoming call bell signal is detected,
The diode bridge is turned on by turning on the electronic switch.
And connect the capacitor to the tone ringer sound generation circuit.
The detection circuit for supplying electric power and the voltage for controlling the electronic switch are made constant voltage
The voltage applied to the tone ringer sound generation circuit is
Do not exceed the breakdown voltage of the ringer sound generation circuit.
A tone ringer power supply circuit comprising a constant voltage circuit and a constant voltage circuit.