Switching oscillator controlled by a moving metal piece专利检索-温度补偿晶体振荡器晶体振荡器电子零件及设备专利检索查询-专利查询网

Switching oscillator controlled by a moving metal piece

阅读：512发布：2021-08-24

专利汇可以提供Switching oscillator controlled by a moving metal piece专利检索，专利查询，专利分析的服务。并且A proximity switch using an oscillator with a divided oscillation winding into which a metal control piece is moved to start and stop oscillations for changing the level of current in the circuit. The center tap of the two parts of the winding is connected to a DC source, a first parallel circuit comprising an oscillation transistor, and a bias circuit; and the opposite ends of the coils are connected across the oscillation transistor and DC source so that the degree of inductive coupling between the coils as controlled by the penetration distance of the metal piece between the coils produces abrupt start and cessation of oscillations in the circuit and corresponding changes in circuit current. Temperature induced hysteresis fluctuations are compensated by use of a temperature responsive bias resistor, an oscillation winding core with a temperature-responsive permeability characteristic, or bimetal flux-shunting strips adjacent to the oscillation windings.，下面是Switching oscillator controlled by a moving metal piece专利的具体信息内容。

权利要求

1. A switching oscillator, comprising: an oscillation winding having a middle tap; a metal piece employed for being inserted into the oscillation winding to change the degree of coupling between first and second parts of the oscillation winding divided thereinto at the middle tap; a first parallel circuit formed by the first part of the oscillation winding and a first resistor; a DC source; an oscillation transistor having its emitter-collector path connected between the first and second terminals of the DC source through the first parallel circuit, the middle tap being connected to the first terminal of the DC source connected to the first parallel circuit; a first capacitor connected between the other end of the second part of the oscillation winding and the base of the transistor; bias means connected between the first terminal of the DC source and the base of the oscillation transistor; and a second parallel circuit formed by a second capacitor and a diode and connected between the base of the oscillation transistor and the second terminal of the DC source; and in which when a predetermined amount of change in the degree of coupling is caused by the movement of the metal piece, switching to an abrupt generation or stop of an alternating current superimposed on the dc current between the terminals of the DC source is performed.

2. A switching oscillator according to claim 1, further comprising: a pair of connection lines inserted for connecting the first and second terminals of the DC source to the collector-emitter path of the oscillating transistor through at least one detection resistor and the first parallel circuit; a smoothing capacitor connected across the connection lines; and amplification means connected to the detection resistor for amplifying a change of a DC current flowing in the detection resistor to apply an amplyfied output to a load.

3. A switch oscillator according to claim 2, in which said bias means comprises at least one resistor having a positive temperature coefficient.

4. A switching oscillator according to claim 2, in which said bias means comprises at least one resistor having a negative temperature coefficient.

5. A switching oscillator according to claim 2, in which said oscillation winding comprises two coils each having a core of a negative temperature coefficient.

6. A switching oscillator according to claim 2, in which said oscillation winding comprises two coils associated with means for controlling the degree of coupling between the coils in the opposite polarity to that caused by a temperature change.

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Switching oscillator controlled by a moving metal piece

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