CN2586192Y - Sinusoidal phase angle closed loop controller - Google Patents

Abstract

The utility model relates to a sinusoidal phase angle closed loop controller which belongs to electrotechnical instrument circuits, particularly a closed loop controller for a phase angle between an output voltage and a current of a standard power source. The phase angle closed loop controller comprises seven units of a program-controlled serial pulse generator, a serial-parallel counter, a data comparator, a phase angle level converter, a phase angle reference level generator, a differential value sampler, etc., wherein, two pulses CLR1 and CLR2 of the data comparator and 36000 CLOCK pulses of the program-controlled serial pulse generator are output to a controlled object, and the 36000 CLOCK pulses are relative to one complete sine wave; the phase angle level converter converts the sine waves which are output by the controlled object into DC levels which are compared with the DC levels which are generated by the phase angle reference level generator in the differential value sampler, and a CPU is utilized to change the phase angle. The utility model utilizes the simple, cheap and feasible circuits to achieve the high-precision phase angle closed loop and solves the difficult problem that the development of the standard power source of the phase angle closed loop obsesses the electrotechnical instrument industry for a long time.

Description

Sinusoidal wave phase angle closed loop controller

One, technical field:

The utility model relates to a kind of electric instrument circuit, relates in particular to the closed loop controller of phase angle between the output voltage in calibration power source and electric current.

Two, background technology:

At present, the domestic digital multiplier that generally adopts is realized the phase angle closed loop.Know COS θ=P/ (V*I) according to electrical power P=V*I*COS θ, if V, I disperses on time shaft and is numerous data, realizes that with the combinational circuit of special IC or design voluntarily the also successive integration of product of each moment V and I obtains DC level and is power P.If V, I is all determined value, can obtain angle values φ according to the P value so, according to P value size control phase angle φ, thereby realizes closed loop.CL301 type electrical measurement transmitter calibrating installation as land Electronics Co., Ltd. of Shenzhen section.The disadvantage of this scheme is to be difficult to realize High Accuracy Control on technology, because the integrator long-term accuracy is difficult to assurance, so control accuracy 0.02% is to be difficult to realize.

Three, summary of the invention:

Technical problem to be solved in the utility model is: provide a kind of range of control at-179.99 °-+179.99 °, 0.03 ° of control accuracy, 0.01 ° of phase angular resolution, the sine wave freuqency scope is 45.00～65.00Hz, frequency resolution 0.01Hz, the closed-loop control of phase angle between the calibration power source output voltage of control accuracy 0.02% and electric current.

The utility model is achieved like this: this phase angle closed loop controller comprises program control serial pulses generator, string and counter, data comparator, phase angle level translator, phase angle reference level generator, difference sampling thief and CPU;

The phase angle level translator, the sine wave that controlled device is exported is converted to corresponding DC level, and exports this DC level, and its input end is connected with the output terminal of controlled device;

The phase angle reference level generator is corresponding benchmark DC level with CPU according to the conversion of signals that phase angle is provided with data output, and exports this benchmark DC level that its input end links to each other with CPU by microcomputer bus;

The difference sampling thief, the DC level of phase angle level translator output and the benchmark DC level of phase angle reference level generator output are compared, and difference outputed to CPU, its input end is connected with the output terminal of phase angle level translator with the phase angle reference level generator respectively, and its output terminal links to each other with CPU by microcomputer bus;

CPU, 1) sine wave freuqency of needs is converted into the frequency of serial pulses CLOCK, and this frequency values is outputed to the input end of program control serial pulses generator by microcomputer bus;

2) change the phase angle initialize data of input data comparator according to the difference of difference sampling thief output, and the phase angle initialize data after will changing by microcomputer bus outputs to the input end of data comparator;

3) angle values is set, and is phase angle reference level data and phase angle initialize data and the input end that outputs to phase angle reference level generator and data comparator respectively by microcomputer bus this conversion of signals;

Program control serial pulses generator, 1) according to the CLOCK frequency values of CPU output, produce and export corresponding serial pulses;

2), produce and export the CLOCK pulse to controlled device according to the CLOCK frequency values of CPU output; The output terminal of program control serial pulses generator connects the input end of input end, string and the counter of controlled device respectively;

String and counter, the serial pulses that program control serial pulses generator is produced converts parallel data signal to, and the output parallel data signal, and its output terminal connects the input end of data comparator;

Data comparator compares the parallel data signal of string and counter generation and the phase angle initialize data of CPU output, and output signal is to controlled device, and its output terminal connects the input end of controlled device.

The utility model is realized high precision phase angle closed loop with simple, cheap, feasible circuit, especially keeps phase longer-term degree of accuracy, has solved to perplex the development difficult problem of electrical instrument industry realization to the calibration power source of phase angle closed loop for a long time.

Four, description of drawings:

Accompanying drawing 1 phase angle closed loop controller schematic diagram

The program-controlled multi-functional calibration power of accompanying drawing 2 YS118 source theory diagram

Five, embodiment:

With reference to the accompanying drawings 1, a kind of sinusoidal wave phase angle closed loop controller of novelty comprises program control serial pulses generator, string and seven unit such as counter, data comparator, phase angle level translator, phase angle reference level generator, difference sampling thief and CPU.CPU calculates the frequency of serial pulses CLOCK according to required sine wave freuqency value, each only complete sinusoidal wave 36000 CLOCK pulse that need, CPU is sent to program control serial pulses generator with the data value that is calculated, and program control serial pulses generator produces the serial pulses of respective frequencies.Serial pulses produces a parallel data and is sent to data comparator after entering string and counter.The phase angle that data comparator is sent CPU here is provided with data and compares with the data of going here and there and counter is sent here, exports a negative pulse CLR2 when both are equal, and string and counter output data are complete 0 o'clock, export a negative pulse CLR1.Pulse CLOCK, CLR1, CLR2 are sent to controlled device together.The sine wave 1 of controlled device output and sinusoidal wave 2 is sent to the phase angle level translator, is converted to corresponding DC level 1 through the phase angle level translator.CPU produces a corresponding DC level 2 according to being provided with after angle values send data to give the phase angle reference level generator.The difference sampling thief is gathered DC level 1, DC level 2, and difference data is sent to CPU, and CPU changes the data value that is sent to data comparator, changes the relative position of CLR1 to CLR2, thereby changes its phase angle, reaches the purpose of closed-loop control.With reference to the accompanying drawings 2, in the program-controlled multi-functional calibration power of YS118 source, the output of phase angle part two negative pulse CLR1, CLR2.CLR1 is sent to the digital waveform part of voltage, and CLR2 is sent to the current digital waveform portion, they respectively behind prime amplifier, power amplifier, the sinusoidal wave and current sinusoidal ripple of output voltage.Phase angle is measured, after the computing, is changed CLR2 with respect to the CLR1 position through the phase angle closed loop controller between this voltage, electric current, up to output voltage, when the electric current phase angle equates with the value of setting till, CLR2 no longer changes with respect to the CLR1 position, thereby has finished closed loop one time.

Claims (1)

1, a kind of sinusoidal wave phase angle closed loop controller is characterized in that: it comprises program control serial pulses generator, string and counter, data comparator, phase angle level translator, phase angle reference level generator, difference sampling thief and CPU;

The phase angle level translator, the sine wave that controlled device is exported is converted to corresponding DC level, and exports this DC level, and its input end is connected with the output terminal of controlled device;

The phase angle reference level generator is corresponding benchmark DC level with CPU according to the conversion of signals that phase angle is provided with data output, and exports this benchmark DC level that its input end links to each other with CPU by microcomputer bus;

The difference sampling thief, the DC level of phase angle level translator output and the benchmark DC level of phase angle reference level generator output are compared, and difference outputed to CPU, its input end is connected with the output terminal of phase angle level translator with the phase angle reference level generator respectively, and its output terminal links to each other with CPU by microcomputer bus;

CPU, 1) sine wave freuqency of needs is converted into the frequency of serial pulses CLOCK, and this frequency values is outputed to the input end of program control serial pulses generator by microcomputer bus;

2) change the phase angle initialize data of input data comparator according to the difference of difference sampling thief output, and the phase angle initialize data after will changing by microcomputer bus outputs to the input end of data comparator;

3) angle values is set, and is phase angle reference level data and phase angle initialize data and the input end that outputs to phase angle reference level generator and data comparator respectively by microcomputer bus this conversion of signals;

Program control serial pulses generator, 1) according to the CLOCK frequency values of CPU output, produce and export corresponding serial pulses;

2), produce and export the CLOCK pulse to controlled device according to the CLOCK frequency values of CPU output; The output terminal of program control serial pulses generator connects the input end of input end, string and the counter of controlled device respectively;

String and counter, the serial pulses that program control serial pulses generator is produced converts parallel data signal to, and the output parallel data signal, and its output terminal connects the input end of data comparator;

Data comparator compares the parallel data signal of string and counter generation and the phase angle initialize data of CPU output, and output signal is to controlled device, and its output terminal connects the input end of controlled device.

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