CN115395938A - Soft starter voltage sampling and synchronous signal extraction integrated circuit system - Google Patents
Soft starter voltage sampling and synchronous signal extraction integrated circuit system Download PDFInfo
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- CN115395938A CN115395938A CN202210999073.0A CN202210999073A CN115395938A CN 115395938 A CN115395938 A CN 115395938A CN 202210999073 A CN202210999073 A CN 202210999073A CN 115395938 A CN115395938 A CN 115395938A
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- 238000005070 sampling Methods 0.000 title claims abstract description 66
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 34
- 239000007858 starting material Substances 0.000 title claims abstract description 27
- 238000000605 extraction Methods 0.000 title claims abstract description 25
- 230000003750 conditioning effect Effects 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 238000005457 optimization Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/13—Modifications for switching at zero crossing
- H03K17/136—Modifications for switching at zero crossing in thyristor switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/129—Means for adapting the input signal to the range the converter can handle, e.g. limiting, pre-scaling ; Out-of-range indication
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention relates to the technical field of power electronics, in particular to a soft starter voltage sampling and synchronous signal extraction integrated circuit system, which comprises: the voltage sampling circuit is used for sampling the voltage output by the CT; the signal conditioning circuit is used for amplifying and biasing the sampling voltage to obtain a sine wave which can be completely read by the control chip ADC; and the control chip ADC is used for receiving the sine wave output by the signal conditioning circuit, and obtaining the actually sampled voltage value and the synchronous signal for triggering the PWM signal output at the same time through software algorithm calculation. The invention provides a soft starter voltage sampling and synchronous signal extraction integrated circuit system, which is characterized in that a soft start voltage sampling circuit and a synchronous signal extraction circuit are unified by using the system, so that the circuit is simplified, the voltage sampling precision is improved, the problem of false triggering caused by voltage zero crossing synchronization is solved, synchronous triggering is stable and reliable, and soft start equipment can stably run under the working condition of a complex electromagnetic environment.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a soft starter voltage sampling and synchronous signal extraction integrated circuit system.
Background
The existing thyristor series connection type high-voltage solid state or low-voltage control high-voltage magnetic control type soft start needs to use thyristor phase control triggering, and the necessary condition of the phase control triggering is that a stable and accurate synchronous signal is needed. The existing soft start equipment uses a zero-crossing trigger mode for synchronization, and a synchronization circuit and a voltage sampling circuit adopt separate circuits due to the use of the zero-crossing trigger.
Under the conditions of very large harmonic waves of a power grid and extremely light load of a transformer, a zero-crossing trigger circuit can cause false triggering due to zero crossing of ripples in the waveform of the power grid, so that synchronization abnormity is caused, and the adaptability of soft start equipment under the working condition of a complex electromagnetic environment is deteriorated. In addition, the synchronous circuit and the voltage sampling circuit are separated, so that the circuit is complex.
The circuit and the method have the advantages that the circuit is simplified, accuracy and reliability of synchronous signal extraction are greatly improved, soft starting equipment can be applied to complex electromagnetic environment working conditions, and accuracy of voltage sampling is improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a soft starter voltage sampling and synchronous signal extraction integrated circuit system integrating voltage sampling and synchronization.
The invention solves the technical problems through the following technical means:
soft starter voltage sampling and synchronizing signal draw integrated circuit system includes:
the voltage sampling circuit is used for receiving the voltage output by the CT, sampling the voltage output by the CT and outputting a sampling voltage;
the signal conditioning circuit is electrically connected with the voltage sampling circuit and is used for receiving the sampling voltage output by the voltage sampling circuit and amplifying and biasing the sampling voltage to obtain a sine wave which can be completely read by the control chip ADC;
and the control chip ADC is electrically connected with the signal conditioning circuit, receives the sine wave output by the signal conditioning circuit, and obtains the actually sampled voltage value and the synchronous signal for triggering the PWM signal output through the calculation of a software algorithm.
As an optimization of the above technical solution, the soft starter voltage sampling and synchronous signal extraction integrated circuit system includes a voltage sampling circuit including three resistance voltage-dividing circuits.
As an optimization of the above technical solution, in the integrated circuit system for soft starter voltage sampling and synchronous signal extraction, a sampling ratio of the voltage sampling circuit is 100.
As an optimization of the above technical solution, the soft starter voltage sampling and synchronous signal extraction integrated circuit system includes a signal conditioning circuit including a two-stage amplification circuit.
As an optimization of the above technical solution, in the integrated circuit system for voltage sampling and synchronous signal extraction of the soft starter, when the signal conditioning circuit amplifies and biases the sampling voltage, the amplification factor is 0.866, and the bias is 1.5V.
As an optimization of the above technical solution, in the integrated circuit system for soft starter voltage sampling and synchronous signal extraction, the software algorithm calculation of the control chip ADC on the input sine wave includes:
a, controlling a chip ADC to trigger through clock interruption, and converting an input analog value into an ADC digital value;
b, converting the read ADC digital value into an actual input value before ADC conversion through calculation;
c, the obtained value is sent to a phase-locked loop program, the phase-locked loop program outputs an actual value of the ADC after filtering through calculation, a conversion point of the sine wave sin value from positive to negative is detected, and a zero-crossing state signal is output when the conversion point is captured;
d, the zero crossing point state output by the phase-locked loop program is sent to the PWM output module to be used as a synchronous signal.
The invention has the advantages that: the invention provides a soft starter voltage sampling and synchronous signal extraction integrated circuit system, which is characterized in that a soft starter voltage sampling circuit and a synchronous signal extraction circuit are unified by using the system, so that the circuit is simplified, the voltage sampling precision is improved, the problem of false triggering caused by voltage zero crossing synchronization is solved, synchronous triggering is stable and reliable, and soft starter equipment can stably run under the working condition of a complex electromagnetic environment.
Drawings
Fig. 1 is a block diagram of the voltage sampling and synchronous signal extraction integrated circuit system of the soft starter.
FIG. 2 is a diagram of a voltage sampling circuit according to the present invention.
FIG. 3 is a circuit diagram of a signal conditioning circuit according to the present invention.
Fig. 4 is a block diagram of the structure of the soft starter voltage sampling and synchronous signal extraction integrated circuit system in embodiment 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A soft starter voltage sampling and synchronous signal extraction integrated circuit system comprises a hardware part and a software part, wherein 100V (typical value, other values) voltage output by a CT is sampled and conditioned by the hardware part to obtain a sine wave which can be completely read by a control chip, and the sine wave is sent to the control chip and is calculated by a software algorithm to simultaneously obtain an actually sampled voltage value and a synchronous signal for triggering PWM signal output;
the hardware part consists of a voltage sampling circuit and a signal conditioning circuit, wherein the sampling circuit consists of 3 resistance voltage dividing circuits shown in figure 2 and outputs 1 small voltage to a subsequent signal conditioning circuit. The signal conditioning circuit is composed of a two-stage method circuit shown in fig. 4, and amplifies and biases the small voltage to control the peak-to-peak value of the sine wave within the allowable range of the ADC input of the control chip.
In the software part, the digital value obtained by ADC sampling is not directly subjected to effective value calculation, but is calculated by a phase-locked loop and then an effective value is obtained; the zero-crossing state of the output is calculated by using a phase-locked loop and used as a synchronous signal.
Referring to fig. 4, embodiment 1, the voltage sampling circuit shown in fig. 2, reduces the input value UIN to UIN/100 by resistance division (sampling ratio 100; the signal is sent to the signal conditioning circuit shown in fig. 3, typically with 100V, 50Hz input and 1V output.
The signal conditioning circuit shown in fig. 3 is composed of two stages of operational amplifiers, and amplifies and biases an input 1V sine wave to an amplitude range of 0-3V, so as to achieve a DSP sampling allowable range; typically, the amplification factor is 0.866, and the offset is 1.5V, i.e. the output value is (UIN/100 × 0.866+ 1.5) V.
And after the output value is sent to the control chip ADC, software algorithm calculation is carried out:
1) Setting the clock interrupt as 0.01ms interrupt, triggering the ADC module through the clock interrupt, and converting an input analog value into an ADC digital value (hereinafter referred to as "ADC value");
2) The read ADC value is converted into an actual input value before ADC conversion through calculation;
3) Sending the obtained value to a phase-locked loop program (general software phase-locked loop logic, which is not described in detail herein), calculating the phase-locked loop program, outputting a filtered actual value of the ADC, detecting a positive-to-negative conversion point of the sine wave sin value, and outputting a zero-crossing state signal when capturing the conversion point;
4) Solving 1 time of root mean square of the filtered ADC actual value output by the phase-locked loop program every 20ms/0.01ms =2000 values to obtain an effective value Ui;
5) The effective value is inversely calculated according to the hardware part to obtain a sampling actual value: (Ui-1.5)/0.866 × 100;
6) And the zero-crossing point state output by the phase-locked loop program is sent to the PWM output module to be used as a synchronous signal.
The invention provides a soft starter voltage sampling and synchronous signal extraction integrated circuit system, which is characterized in that a soft starter voltage sampling circuit and a synchronous signal extraction circuit are unified by using the system, so that the circuit is simplified, the voltage sampling precision is improved, the problem of false triggering caused by voltage zero crossing synchronization is solved, synchronous triggering is stable and reliable, and soft starter equipment can stably run under the working condition of a complex electromagnetic environment.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. Soft starter voltage sampling and synchronizing signal draw integrated circuit system, its characterized in that includes:
the voltage sampling circuit is used for receiving the voltage output by the CT, sampling the voltage output by the CT and outputting a sampling voltage;
the signal conditioning circuit is electrically connected with the voltage sampling circuit and is used for receiving the sampling voltage output by the voltage sampling circuit and amplifying and biasing the sampling voltage to obtain a sine wave which can be completely read by the control chip ADC;
and the control chip ADC is electrically connected with the signal conditioning circuit, receives the sine wave output by the signal conditioning circuit, and obtains the actually sampled voltage value and the synchronous signal for triggering the PWM signal output through the calculation of a software algorithm.
2. The soft-starter voltage sampling and synchronization signal extraction integrated circuit system of claim 1, wherein: the voltage sampling circuit comprises three resistance voltage division circuits.
3. The soft-starter voltage sampling and synchronization signal extraction integrated circuit system of claim 2, wherein: the sampling ratio of the voltage sampling circuit is 100.
4. The soft-starter voltage sampling and synchronization signal extraction integrated circuit system of claim 1, wherein: the signal conditioning circuit comprises a two-stage amplifying circuit.
5. The soft-starter voltage sampling and synchronization signal extraction integrated circuit system of claim 1, wherein: when the signal conditioning circuit amplifies and biases the sampling voltage, the amplification factor is 0.866, and the bias is 1.5V.
6. The integrated soft-starter voltage sampling and synchronous signal extraction circuit system of claim 1, wherein the software algorithm calculation of the control chip ADC on the input sine wave comprises:
a, controlling a chip ADC to trigger through clock interruption, and converting an input analog value into an ADC digital value;
b, converting the read ADC digital value into an actual input value before ADC conversion through calculation;
c, the obtained value is sent to a phase-locked loop program, the phase-locked loop program outputs an ADC actual value after filtering through calculation, a conversion point of the sine wave sin value from positive to negative is detected, and a zero-crossing state signal is output when the conversion point is captured;
d, the zero crossing point state output by the phase-locked loop program is sent to the PWM output module to be used as a synchronous signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210999073.0A CN115395938A (en) | 2022-08-19 | 2022-08-19 | Soft starter voltage sampling and synchronous signal extraction integrated circuit system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210999073.0A CN115395938A (en) | 2022-08-19 | 2022-08-19 | Soft starter voltage sampling and synchronous signal extraction integrated circuit system |
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| CN115395938A true CN115395938A (en) | 2022-11-25 |
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| CN202210999073.0A Pending CN115395938A (en) | 2022-08-19 | 2022-08-19 | Soft starter voltage sampling and synchronous signal extraction integrated circuit system |
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- 2022-08-19 CN CN202210999073.0A patent/CN115395938A/en active Pending
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