A. c. control circuit专利检索-正弦波滤波器变压器和转换设备专利检索查询-专利查询网

A. c. control circuit

阅读：576发布：2023-04-04

专利汇可以提供A. c. control circuit专利检索，专利查询，专利分析的服务。并且An a.c. control circuit comprising circuitry connected to receive a d. c. program reference control voltage, as from a speed, tension, or torque voltage-responsive source, and which may include a suitable d.c. amplifier connected to provide the d.c. input to a suitable chopper having a chopping drive signal circuit connected to a main a.c. power source to provide a square wave chopper output having a peak-to-peak amplitude responive to the programmed d.c. input voltage and a frequency equal to and 180* out of phase with the main a.c. power source frequency. This programmed square wave control signal is coupled to an active filter which may comprise an operational amplifier having a negative feedback with a sharply tuned filter therein, such as a sharp twin-T notch filter tuned sharply to the frequency of the main a.c. power source, whereby a stable and drift-free sine wave output control voltage is provided having a frequency synchronous and in phase with the main a.c. power source frequency and a peak-to-peak amplitude directly responsive to the chopper square wave output amplifier. The controlled a.c. power is supplied through a full-wave rectifier such as an unfiltered full-wave bridge rectifier, having inputs connected across the main a.c. power source and outputs connected to emitter-follower power inputs of an emitter-follower amplifier. The programmed control is provided by coupling the active filter output through a suitable transformer to a base drive circuit of the emitterfollower amplifier, whereby the latter has a power output voltage having a wave form corresponding substantially to the programmed drive control voltage from the active filter, free from line voltage fluctuations or variable circuit-component effects.，下面是A. c. control circuit专利的具体信息内容。

权利要求

1. An a.c. control circuit including means for producing sine wave programming drive signals insensitive to electrical variables other than predetermined program reference variables comprising means for connecting said sine wave drive signal producing means to a d.c. program reference source having a program reference control voltage for programming the voltage of said a.c. control circuit, a d.c. operational amplifier having an input energized by connection through said connecting means to said d.c. program reference source and an output to provide an amplified program reference control voltaGe and also connected to provide a large negative feedback to said operational amplifier, an a.c. frequency-reference transformer having a primary with an input connection for energization by a main a.c. power source and a secondary output, a chopper having a d.c. input connected to said operational amplifier output and a chopping drive signal circuit connected to said a.c. frequency-reference transformer output, said chopper having an output providing a square wave signal with a peak-to-peak amplitude in accordance with said d.c. operational amplifier output program-reference control voltage and a frequency equal to and 180* out of phase with the main a.c. power source frequency, a sharp twin-T notch filter tuned sharply to the frequency of the main a.c. power source, means including an operational amplifier active filter having a negative feedback connection and an input drive circuit coupled to said chopper output through said sharp notch filter connected in said negative feedback connection and having an output providing a stable and drift-free sine wave output control voltage having a frequency synchronous with and in phase with the main a.c. power source frequency and a peak-topeak amplitude directly responsive to the peak-to-peak amplitude of said chopper square wave output; and a program controlled power supply comprising an unfiltered full-wave bridge rectifier having inputs connected across the main a.c. power source and having output terminals, a quasi-complementary emitter-follower amplifier having emitterfollower power inputs connected to said bridge rectifier output terminals, a drive control transformer having a primary and a secondary with said primary connected for energization by said operational amplifier active filter output whereby said secondary provides a drive control voltage programmed by said drive signal producing means, and said emitter follower amplifier having a amplifier drive input connected to said drive control transformer secondary and having a power output for connection to a load whereby said power output voltage has an a.c. voltage wave form corresponding substantially to the programmed drive control voltage from said control transformer secondary.

2. In an a.c. control circuit for producing sine wave programming drive signals insensitive to electrical variables other than predetermined program reference variables including an a.c. power source, a d.c. reference signal source having an amplitude responsive to a predetermined characteristic, means to program said a.c. power source by said d.c. reference signal source to develop a sine wave control signal having a frequency synchronous with and in phase with the a.c. power source frequency and an amplitude directly response to the amplitude of said d.c. reference signal source; the improvement comprising an unfiltered power supply having a full-wave bridge rectifier with inputs connected to said a.c. power source and having output terminals, an emitter-follower amplifier having power inputs connected to the output terminals of said bridge rectifier, transformer means having a primary winding energized by said sine wave control signal and a secondary winding connected to said a.c. power supply and said emitter-follower amplifier for providing a drive control voltage to said emitter-follower amplifier, and said emitter-follower amplifier having a power output for connection to a load, whereby the output voltage from said emitter-follower amplifier has an a.c. voltage corresponding substantially to the drive control voltage supplied by said transformer means.

3. The structure of claim 2 including transient protector means connected across the output terminals of said bridge rectifier.

4. An a.c. control circuit comprising a d.c. program reference source having a control voltage, an a.c. power source, a chopper having a d.c. input for wave amplitude response to the reference voltage of said d.c. program reference source And a chopping drive signal circuit and a chopper output, a first means for connecting said d.c. program reference source to said chopper d.c. input and a second means for connecting said a.c. power source to said chopping drive signal circuit, whereby said chopper output provides a square wave signal having a peak-to-peak amplitude in accordance with the d.c. program reference voltage and a frequency equal to the main a.c. power source frequency, an operational amplifier having an active filter means connected to said chopper output and tuned to the frequency of the a.c. power source so that said amplifier has an output providing a programmed sine wave control voltage with an amplitude directly responsive to the peak-to-peak amplitude of said chopper output and a frequency synchronous and in phase with the a.c. power source frequency, a full-wave bridge rectifier having inputs connected to said a.c. power source and having output terminals, an emitter-follower amplifier having power inputs connected to the output terminals of said bridge rectifier, transformer means having a primary winding energized by said sine wave control voltage and a secondary winding connected to said a.c. power source and an amplifier drive input of said emitter-follower amplifier for providing a drive control voltage to said emitter-follower amplifier, and said emitter-follower amplifier having a power output which is insensitive to electrical variables other than the predetermined program reference variables, whereby the output voltage from said emitter-follower amplifier has an a.c. voltage corresponding substantially to the driving control voltage supplied by said transformer means.

5. The a.c. control circuit of claim 4 in which said first means connecting said d.c. program reference signal source to said chopper d.c. input comprises a d.c. operational amplifier having an input energized by connection to said d.c. program reference signal source and an output connected to said chopper d.c. input for supplying an amplified program reference control voltage thereto.

6. An a.c. control circuit as defined in claim 5 in which said d.c. operational amplifier output is connected to provide a large negative feedback to said d.c. operational amplifier.

7. The a.c. control circuit of claim 4 in which said second means for connecting said main a.c. power source to said chopping drive signal circuit comprises a transformer having a primary energized by said a.c. power source and a secondary connected to said chopping drive signal circuit.

8. An a.c. control circuit as defined in claim 4 in which said active filter means includes a negative feedback connection for said operational amplifier having a band pass filter sharply tuned to the frequency of the main a.c. power source and an input drive circuit coupled to said chopper output and an active filter output connected to the output of said operational amplifier.

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A. c. control circuit

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