CN104198781A - Method and device for controlling AC (alternating current) signal output - Google Patents
Method and device for controlling AC (alternating current) signal output Download PDFInfo
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- CN104198781A CN104198781A CN201410453882.7A CN201410453882A CN104198781A CN 104198781 A CN104198781 A CN 104198781A CN 201410453882 A CN201410453882 A CN 201410453882A CN 104198781 A CN104198781 A CN 104198781A
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Abstract
The invention discloses a method and a device for controlling AC (alternating current) signal output to acquire a pulse signal. The pulse signal and the AC signal have the same period, and the time of the pulse signal changing from a first amplitude to a second amplitude corresponds to a first phase angle value of the AC signal. According to the first phase angle value and the period of the AC signal, the time interval of a phase angle of the AC signal changing from the first phase angle value to a preset phase angle value is calculated. Timing starts when the pulse signal is detected changing from the first amplitude to the second amplitude, and after the time interval, the AC signal output is controlled. By the aid of the method and the device, shortages of a traditional test method are overcome, a starting phase angle of an output voltage of the AC signal can be controlled, and test efficiency and accuracy of a test result are improved.
Description
Technical field
The present invention relates to electricity field, particularly relate to a kind of method and device of controlling AC signal output.
Background technology
The R&D process of Switching Power Supply relates to the project of a lot of tests, as on time, retention time and surge current.And the test value of on time, retention time and surge current not only depends on the size of AC signal output voltage effective value, also depend on the starting phase angle of output voltage.
On time is 0 or 180 the longest while spending at the starting phase angle of AC signal output voltage, the shortest when 90 or 270 spend.The test on time need to be 0 or 180 just can measure the maximum duration of start while spending at starting phase angle.And the retention time of Switching Power Supply at the starting phase angle of output voltage, be 0 or 180 the shortest while spending, the longest when 90 or 270 spend.The test retention time need to be 0 or 180 just can measure the shortest retention time while spending at starting phase angle.Most Switching Power Supply is owing to there being the input filter capacitor that capacity is larger, and booting moment produces very large peak point current, i.e. surge current.Surge current is 90 or 270 to reach maximum while spending at the starting phase angle of AC signal output voltage, need to be therefore 90 or 270 to measure while spending at the starting phase angle to switch power source output voltage, otherwise will affect the accuracy of measurement.
But traditional method of testing has no idea to control the starting phase angle of AC signal output voltage, can only be ceaselessly switching on and shutting down, play at some game of chance to realize, reduced the efficiency of test.Meanwhile, owing to can not controlling comparatively accurately the starting phase angle of AC signal output voltage, when measuring each project, can not guarantee that AC signal exports when the needed phasing degree of correspondence, thereby cause test result to have larger error.
Summary of the invention
The object of this invention is to provide a kind of method and device of controlling AC signal output, object is to solve in traditional test the problem that causes the low and larger error of test result existence of testing efficiency because not controlling the starting phase angle of AC signal output voltage.
For solving the problems of the technologies described above, the invention provides a kind of method of controlling AC signal output, comprising:
Obtain pulse signal, the cycle of described pulse signal is identical with the cycle of described AC signal, and described pulse signal by the first amplitude, is changed to the moment of the second amplitude and the first-phase parallactic angle value of described AC signal is corresponding;
According to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value;
From the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, start timing, after described interval time, control described AC signal output.
Wherein, described in, obtaining pulse signal comprises: described AC signal is converted to pulse signal.
Wherein, described pulse signal is square-wave signal.
Wherein, the moment that described pulse signal changes to the second amplitude by the first amplitude is the moment that square-wave signal negative edge is corresponding.
Wherein, before the phasing degree of the described AC signal of described calculating changes to the interval time of preset phase angle value by described first-phase parallactic angle value, also comprise:
Calculate the cycle of described square-wave signal, the cycle that the cycle of described square-wave signal is described AC signal.
Wherein, before the phasing degree of the described AC signal of described calculating changes to the interval time of preset phase angle value by described first-phase parallactic angle value, also comprise: receive described preset phase angle value.
Wherein, also comprise: show described preset phase angle value.
The present invention also provides a kind of device of controlling AC signal output, comprising: acquisition module, processing computing module and output control module, wherein:
Described acquisition module, for obtaining pulse signal, the cycle of described pulse signal is identical with the cycle of described AC signal, and described pulse signal by the first amplitude, is changed to the moment of the second amplitude and the first-phase parallactic angle value of described AC signal is corresponding;
Described processing computing module, for the cycle according to described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value;
Described control output module, for starting timing from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, after described interval time, controls described AC signal output.
Wherein, described acquisition module comprises:
Described AC signal is converted to the waveform changing circuit of square-wave signal, in described waveform changing circuit, the annexation of components and parts comprises:
Resistance R 1, resistance R 2 are connected with resistance R 3, diode D1 connects with light emitting diode afterwards and resistance R 2 is in parallel, the negative electrode of described diode D1 is connected with the anode of described light emitting diode, light emitting diode and phototriode form buffer circuit U1, the collector of described phototriode is connected with power supply, emitter connect with resistance R 4 and resistance R 5 after ground connection, the base stage of triode Q1 is connected in the centre of described resistance R 4 and resistance R 5, the collector of described triode Q1 is connected with power supply with after resistance R 6 series connection, the grounded emitter of described triode Q1.
Wherein, described control output module is for starting timing and comprise from moment that described pulse signal changes to the second amplitude by the first amplitude being detected:
Described control output module is specifically for starting timing from the described moment corresponding to square-wave signal negative edge being detected.
Wherein, also comprise: receiver module, for receiving described preset phase angle value.
Wherein, also comprise: display module, for showing described preset phase angle value.
A kind of method and device of controlling AC signal output provided by the present invention, obtain the pulse signal identical with the cycle of described AC signal, because described pulse signal is changed to the moment of the second amplitude by the first amplitude and the first-phase parallactic angle value of described AC signal is corresponding, so according to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree that can calculate described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value, so just the angle difference of preset phase angle value and first-phase parallactic angle value is converted to the spacing value on output time, therefore from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, start timing, after described interval time, the phasing degree of AC signal is just preset phase angle, now control AC signal output, the starting phase angle value of the AC signal of output is preset phase angle value.This shows, the invention solves the defect of traditional method of testing, can control the starting phase angle of AC signal output voltage, improved the efficiency of test and the accuracy of test result.
Accompanying drawing explanation
Fig. 1 is the disclosed a kind of process flow diagram of controlling AC signal output intent of the embodiment of the present invention;
Fig. 2 is the process flow diagram of the disclosed another control AC signal output intent of the embodiment of the present invention;
Fig. 3 is the circuit diagram of the disclosed another control AC signal output intent of the embodiment of the present invention;
Fig. 4 is the partial circuit figure of the disclosed another control AC signal output intent of the embodiment of the present invention;
Fig. 5 waveform schematic diagram that to be the disclosed another control AC signal output intent of the embodiment of the present invention order at A point and B;
Fig. 6 is the structural representation of the disclosed control AC signal of embodiment of the present invention output unit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
The invention provides a kind of embodiment that controls AC signal output intent, as shown in Figure 1, this embodiment comprises the following steps:
S101: obtain pulse signal.
The cycle of the pulse signal acquiring is identical with the cycle of described AC signal, and described pulse signal is changed to the moment of the second amplitude by the first amplitude and the first-phase parallactic angle value of described AC signal is corresponding.
S102: the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by first-phase parallactic angle value.
According to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value;
S103: start timing from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, after described interval time, control described AC signal output.
The present embodiment provides a kind of method of controlling AC signal output, obtain the pulse signal identical with the cycle of described AC signal, because described pulse signal is changed to the moment of the second amplitude by the first amplitude and the first-phase parallactic angle value of described AC signal is corresponding, so according to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree that can calculate described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value, so just the angle difference of preset phase angle value and first-phase parallactic angle value is converted to the spacing value on output time, therefore from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, start timing, after described interval time, the phasing degree of AC signal is just preset phase angle, now control AC signal output, the starting phase angle value of the AC signal of output is preset phase angle value.This shows, the invention solves the defect of traditional method of testing, can control the starting phase angle of AC signal output voltage, improved the efficiency of test and the accuracy of test result.
The invention provides a kind of another embodiment that controls AC signal output intent, please refer to Fig. 2 and Fig. 3, Fig. 2 is the process flow diagram of the another embodiment of the application, and Fig. 3 is the circuit diagram of the another embodiment of the application, and this embodiment comprises the following steps:
S201: AC sine signal is converted to square-wave signal.
Please refer to Fig. 4, AC sine signal is by R1, R2 and R3 dividing potential drop, and by lower voltage, D1 is for one-way conduction, and U1 is for isolation.When R1 end is for just, R3 end is for negative, the diode current flow of U1 inside, and the transistor emitter output high level of U1 inside, Q1 conducting, the collector of Q1 is exported low.When R1 end is for negative, R3 end is being for just, D1 cut-off, and the diode reverse cut-off of U1 inside, the triode cut-off of U1 inside, the transistor emitter output of U1 inside is low, Q1 cut-off, Q1 collector is exported high.Utilize the one-way conduction characteristic of D1, AC sine signal (A point waveform) can be converted to square-wave signal (B point waveform), as shown in Figure 5.Described AC sine signal is identical with the cycle of described square-wave signal, and the rising edge of described square-wave signal and the corresponding described AC sine signal 0 degree phasing degree value of negative edge difference and 180 degree phasing degree values.Take negative edge as example, and the negative edge of described square-wave signal is corresponding with described AC signal 180 degree phasing degree values.
Existing that AC signal is converted to the method for square-wave signal is a lot, is not limited to this kind of method, if the method that can realize this function all can, this does not affect realization of the present invention.
In addition, the pulse signal that the present embodiment acquires is specially square-wave signal, it should be noted that, other pulse signals that can satisfy condition can be realized the present invention too, should be not limited to this kind of square-wave signal.
S202: calculate the frequency of alternating current, calculate the cycle by frequency.
The square-wave signal obtaining by step S201 calculates its frequency, and then obtains the frequency of described AC signal.
In this step, can also, by gathering the voltage of AC signal, calculate the frequency of AC signal.If adopt this kind of method, the order of step S202 and step S201 can exchange, and does not affect realization of the present invention.But the method by square wave calculated rate can be simpler.
S203: the phasing degree of calculating described AC sine signal is changed to the interval time of preset phase angle value by 180 degree phasing degree values.
According to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC sine signal is changed to the interval time of preset phase angle value by 180 degree phasing degree values.For example, a complete sine wave is 360 degree, if the frequency calculating is 1Hz.Cycle is 1s so.When preset phase angle value is 270 while spending, in conjunction with Fig. 5, can obtain, the phasing degree of described AC signal changes to 270 by 180 degree need to be through 1/4th cycles, i.e. 0.25s while spending.
S204: when CPU detects the negative edge of described square wave, start timer and start timing, after described interval time, control described AC signal output.
As shown in Figure 5, in phasing degree value, be 180 while spending, there is negative edge in square wave.Now the CPU in single-chip microcomputer detects negative edge, starts to start timer timing, when the time of CPU timing is 0.25s, outputs signal to Q2, and Q2 drives relay closes, makes output terminal output AC signal.Now the starting phase angle of the AC signal of output is preset phase angle value 270 degree.
Alternatively, before step S203, also comprise the reception to described preset phase angle value.
In addition, the present embodiment also comprises described preset phase angle value shown, the preset phase angle numerical value that can avoid like this user to forget setting, affects next step work.Certainly, do not show that described preset phase angle value is also fine, and can not affect realization of the present invention.
The embodiment of the present application can be used for the test on time, retention time and surge current in Switching Power Supply R&D process.During as on time at Test Switchboard power supply, need to test its longest on time, and be that 0 or 180 on times while spending are the longest at output voltage starting phase angle, this just need to control AC signal is 0 or 180 outputs while spending at phasing degree.The method of utilizing the embodiment of the present application to provide, can control the output of the AC signal at respective phase angle, has avoided multiple switching machine to test, and has improved the efficiency of test.Meanwhile, the method can be controlled the starting phase angle of AC signal output voltage comparatively accurately, can guarantee that AC signal, in correspondence needed phasing degree output, has improved the accuracy rate of test result when test.
As shown in Figure 6, the present invention also provides a kind of embodiment that controls AC signal output unit, comprising:
Acquisition module 100, for obtaining pulse signal, the cycle of described pulse signal is identical with the cycle of described AC signal, and described pulse signal by the first amplitude, is changed to the moment of the second amplitude and the first-phase parallactic angle value of described AC signal is corresponding;
Process computing module 200, for the cycle according to described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value;
Control output module 300, for starting timing from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, after described interval time, control described AC signal output.
A kind of device of controlling AC signal output provided by the present invention, this device obtains the pulse signal identical with the cycle of described AC signal, because described pulse signal is changed to the moment of the second amplitude by the first amplitude and the first-phase parallactic angle value of described AC signal is corresponding, so according to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree that can calculate described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value, so just the angle difference of preset phase angle value and first-phase parallactic angle value is converted to the spacing value on output time, therefore from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, start timing, after described interval time, the phasing degree of AC signal is just preset phase angle, now control AC signal output, the starting phase angle value of the AC signal of output is preset phase angle value.This shows, the invention solves the defect of traditional method of testing, can control the starting phase angle of AC signal output voltage, improved the efficiency of test and the accuracy of test result.
A kind of another embodiment that controls AC signal output unit provided by the present invention as shown in Figure 4.In an embodiment, described acquisition module comprises the waveform changing circuit that AC sine signal is converted to square-wave signal, and in described waveform changing circuit, the annexation of components and parts comprises:
Resistance R 1, resistance R 2 are connected with resistance R 3, diode D1 connects with light emitting diode afterwards and resistance R 2 is in parallel, the negative electrode of described diode D1 is connected with the anode of described light emitting diode, light emitting diode and phototriode form buffer circuit U1, the collector of described phototriode is connected with power supply, emitter connect with resistance R 4 and resistance R 5 after ground connection, the base stage of triode Q1 is connected in the centre of described resistance R 4 and resistance R 5, the collector of described triode Q1 is connected with power supply with after resistance R 6 series connection, the grounded emitter of described triode Q1.
Described processing computing module is specifically as follows single-chip microcomputer (MCU), and described single-chip microcomputer comprises CPU, for detection of the negative edge of square wave.It is pointed out that negative edge can be also rising edge herein, only take negative edge herein as example.
Described output control module comprises timer, relay and Q2, and described timer is for start timing when CPU detects negative edge, and described relay and Q2 are for controlling the output of AC signal.
This device also comprises receiver module and display module (not shown in FIG.), for described preset phase angle value being received and showing.
Described in the present embodiment, the principle of work of circuit is: the AC sine signal of input is divided into two-way synchronizing signal, path one is as treating output AC signal, path two is converted to square-wave signal through acquisition module and delivers to single-chip microcomputer (MCU), MCU calculates the frequency of AC sine signal by square wave, by frequency, calculate its cycle, according to the cycle, obtain again the interval time of the described preset phase angle value phasing degree value corresponding with described negative edge, timer starts timing when CPU detects negative edge, after the described time interval, by Q2, drive relay closes, the output AC signal for the treatment of in control path one is exported.
Above method and the device of control AC signal output provided by the present invention are described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (12)
1. a method of controlling AC signal output, is characterized in that, comprising:
Obtain pulse signal, the cycle of described pulse signal is identical with the cycle of described AC signal, and described pulse signal by the first amplitude, is changed to the moment of the second amplitude and the first-phase parallactic angle value of described AC signal is corresponding;
According to the cycle of described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value;
From the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, start timing, after described interval time, control described AC signal output.
2. the method for control AC signal as claimed in claim 1 output, is characterized in that, described in obtain pulse signal and comprise: described AC signal is converted to pulse signal.
3. the method for control AC signal output as claimed in claim 1 or 2, is characterized in that, described pulse signal is square-wave signal.
4. the method for control AC signal output as claimed in claim 3, is characterized in that, the moment that described pulse signal changes to the second amplitude by the first amplitude is the moment that square-wave signal negative edge is corresponding.
5. the method for control AC signal output as claimed in claim 3, is characterized in that, before the phasing degree of the described AC signal of described calculating changes to the interval time of preset phase angle value by described first-phase parallactic angle value, also comprises:
Calculate the cycle of described square-wave signal, the cycle that the cycle of described square-wave signal is described AC signal.
6. the method for control AC signal output as claimed in claim 1, is characterized in that, before the phasing degree of the described AC signal of described calculating changes to the interval time of preset phase angle value by described first-phase parallactic angle value, also comprises:
Receive described preset phase angle value.
7. the method for control AC signal output as claimed in claim 1, is characterized in that, also comprises:
Show described preset phase angle value.
8. a device of controlling AC signal output, is characterized in that, comprising: acquisition module, processing computing module and output control module, wherein:
Described acquisition module, for obtaining pulse signal, the cycle of described pulse signal is identical with the cycle of described AC signal, and described pulse signal by the first amplitude, is changed to the moment of the second amplitude and the first-phase parallactic angle value of described AC signal is corresponding;
Described processing computing module, for the cycle according to described first-phase parallactic angle value and described AC signal, the phasing degree of calculating described AC signal is changed to the interval time of preset phase angle value by described first-phase parallactic angle value;
Described control output module, for starting timing from the moment that described pulse signal changes to the second amplitude by the first amplitude being detected, after described interval time, controls described AC signal output.
9. the device of control AC signal output as claimed in claim 8, is characterized in that, described acquisition module comprises:
Described AC signal is converted to the waveform changing circuit of square-wave signal, in described waveform changing circuit, the annexation of components and parts comprises:
Resistance R 1, resistance R 2 are connected with resistance R 3, diode D1 connects with light emitting diode afterwards and resistance R 2 is in parallel, the negative electrode of described diode D1 is connected with the anode of described light emitting diode, described light emitting diode and phototriode form buffer circuit U1, the collector of described phototriode is connected with power supply, emitter connect with resistance R 4 and resistance R 5 after ground connection, the base stage of triode Q1 is connected in the centre of described resistance R 4 and resistance R 5, the collector of described triode Q1 is connected with power supply with after resistance R 6 series connection, the grounded emitter of described triode Q1.
10. the device of control AC signal as claimed in claim 8 output, is characterized in that, described control output module is for starting timing and comprise from moment that described pulse signal changes to the second amplitude by the first amplitude being detected:
Described control output module is specifically for starting timing from the described moment corresponding to square-wave signal negative edge being detected.
The device of 11. control AC signal outputs as claimed in claim 8, is characterized in that, also comprises:
Receiver module, for receiving described preset phase angle value.
The device of 12. control AC signal outputs as claimed in claim 8, is characterized in that, also comprises:
Display module, for showing described preset phase angle value.
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| CN201410453882.7A CN104198781B (en) | 2014-09-05 | 2014-09-05 | A kind of method and device for controlling AC signal to export |
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| CN201410453882.7A CN104198781B (en) | 2014-09-05 | 2014-09-05 | A kind of method and device for controlling AC signal to export |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10983149B2 (en) | 2019-09-06 | 2021-04-20 | Chicony Power Technology Co., Ltd. | Inrush current test device |
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