JPS5824514Y2 - signal supply device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a signal supply device that applies a signal from a mechanical switch and a switching signal from a transistor to a controlled device as a control signal. This is intended to avoid adverse effects on the pulse signal coming from the transistor.

When selecting a channel on a television receiver, for example, one method is to send channels one by one by turning a mechanical switch on and off, and the other is to select a predetermined channel by applying pulses that are repeated at regular intervals using a remote control device. Both methods may be used.

In this case, the signal from the mechanical switch and the above pulse signal are applied from the same terminal, so if an integrating circuit is provided in the mechanical switch circuit to remove the signal due to chattering, the above pulse signal is integrated by this integrating circuit. There are drawbacks to this.

Therefore, the present invention aims to provide a signal supply device that eliminates this drawback, and embodiments of the present invention will be described below with reference to the drawings.

As shown in the figure, one end of the mechanical switch 1 is grounded via a resistor 2, the other end is grounded via a capacitor 3, and further connected to one end of a resistor 4, and the other end of this resistor 4 is connected to a capacitor 5 and a resistor 6. It is connected to the DC power supply terminal 7 through a parallel circuit with.

The capacitor 3.5 and the resistor 2.4.6 constitute a first integrating circuit, which integrates and removes the signals a and b caused by chattering when the mechanical switch 1 is turned on and off.

On the other hand, the emitter of the switching transistor 8 is grounded, and an input terminal 9 is provided at the base.

A pulse signal having a repetition frequency high enough to be integrated by the first integrating circuit is applied to this input terminal 9.

The collector of the transistor 8 is connected to one end of a resistor 10, and the other end of the resistor 10 is connected to the DC power supply terminal 7 through a parallel circuit of a resistor 11 and a capacitor 12.

This resistor 10°11 and the capacitor constitute a second integrating circuit, and this integrating circuit is used to remove the noise of the pulse obtained at the collector of the transistor 8. No impact.

An output terminal 13 is provided to this second integrating circuit.

The output obtained at this output terminal 13 is applied to the controlled device.

A diode 1, which is a feature of the present invention, is placed between the above two integrating circuits.
4 is connected.

Now, when the mechanical switch 1 is turned on and then turned off again, a signal having a waveform as shown in the figure will be generated at the switch 1.

a and b are signals due to the above-mentioned chattering.

The signal due to this chattering is removed by the first integrating circuit.

At this time, the cathode of the diode 14 is at a low potential, and the anode is at a high potential since the transistor 8 is cut off, so the diode 14 is conductive.

Therefore, the signal integrated by the first integrating circuit passes through the diode 14 and is output to the output terminal 13.

C is the obtained signal.

When mechanical switch 1 is off and the pulse shown is applied to transistor 80, this pulse appears at the collector of transistor 8.

At this time, the diode 14 is cut off, so the first integrating circuit does not affect the circuit operation at all.

Therefore, the illustrated pulse a is obtained at the output terminal 13.

Examples of capacitor and resistor values are as follows.

Resistor 2...5.6Ω, capacitor 3...
...0.1μF.

Resistor 4...5.6Ω, capacitor 5...
...0.1 μF.

Resistor 6...22 Ω, resistance 10...
...IOKΩ.

Resistor 11...68Ω, capacitor...0.
According to the present invention, the pulses passing through the switching transistor are not integrated by the first integrating circuit, so that an accurate signal can be obtained at the output terminal.

[Brief explanation of drawings]

The figure is a circuit diagram of a signal supply device in an embodiment of the present invention. 1... Mechanical switch, 2.3.4.5.6...
...Resistor and capacitor for the first integration circuit, 10.
11゜12...Resistor for second integration circuit, capacitor, 8...Switching transistor, 7
...DC power supply terminal, 13...Output terminal, 9...Input terminal, 14...Diode.

Claims (1)

[Scope of utility model registration request] a mechanical switch; a first integrating circuit that integrates level changes due to on/off of the mechanical switch and removes high-frequency signals caused by chattering of the mechanical switch;
a switching transistor that receives a pulse signal having a repetition frequency high enough to be integrated by the first integrating circuit; a second integrating circuit that removes noise from the output of this transistor; and the first integrating circuit. and the second integrating circuit, and when the mechanical switch is turned on and no pulse signal is applied to the pace of the transistor, it is in a conductive state, and the mechanical switch is open and the pace of the transistor is connected. and a diode that is in a cutoff state when a pulse signal is applied, and the second integrating circuit is provided with an output terminal.