CN103529307B - Measuring signal device - Google Patents
Measuring signal device Download PDFInfo
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- CN103529307B CN103529307B CN201210233698.2A CN201210233698A CN103529307B CN 103529307 B CN103529307 B CN 103529307B CN 201210233698 A CN201210233698 A CN 201210233698A CN 103529307 B CN103529307 B CN 103529307B
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- voltage division
- impact damper
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Abstract
The invention discloses a kind of measuring signal device that can be used to measure high voltage control signal, it comprises bleeder circuit, low distortion impact damper and counter.Bleeder circuit can be used to receive high voltage control signal and carry out dividing potential drop to it, to obtain voltage division signal further.Low distortion impact damper connects bleeder circuit, is used for receiving voltage division signal and keeping rising waveform and the falling waveform of voltage division signal, makes the waveform of its corresponding high voltage control signal.Counter connects low distortion impact damper, is used for the rising waveform of calculating partial pressure signal and the switching time of falling waveform.By this, can measure accurately high voltage control signal.
Description
Technical field
The present invention about a kind of measuring signal device, and especially, about a kind of can the measuring signal device of high voltage control signal that exports of accurate measurement drive unit or control device.
Background technology
Electronic installation needs input control signal usually, can be performed various function by driving or control.Such as, light-emitting diode assembly, after passing into control signal, can be started luminescence or stop luminous by controlling.Generally speaking, control device input pulse width modulation (PWM) signal can be utilized to control the luminescent behavior of light-emitting diode assembly, when pulse width modulation signal waveform rises, light-emitting diode assembly starts to enter luminance, and light-emitting diode assembly stops luminous when pulse width modulation signal waveform declines.
In order to ensure the accuracy of light-emitting diode assembly switching time, the rising waveform of pulse width modulation signal and the width of falling waveform must be enough narrow, and in other words, the time of signal transition or switching must be enough short.In prior art, the mode being used for measuring pulse width modulation signal is with the signal output pin position of a measuring signal device connection control device, use received pulse width modulation signal and inspect its waveform, then calculating the switching time of rising waveform and falling waveform further.Be used for the measuring signal device of pulse width modulation signal of test control device and output thereof, its measuring time value degree of accuracy also requires whether just accurately can test out control device to nS grade can control light-emitting diode assembly exactly and open or close.
Due to the control signal that the pin position of the control device palpus measurement of light emitting diode exports, the magnitude of voltage that its voltage can bear higher than general signal measuring equipment 24 volts, therefore, control signal first just must can input to measuring equipment after dividing potential drop makes its voltage lower than 24 volts.But when control signal is after dividing potential drop, its rising waveform and falling waveform can be out of shape and distortion, and then the degree of accuracy that impact measures.Refer to Fig. 1, the waveform schematic diagram of the control signal before Fig. 1 illustrates the dividing potential drop of prior art and after dividing potential drop.As shown in Figure 1, the longitudinal axis is voltage and transverse axis is the time, and the control signal (waveform below Fig. 1) after dividing potential drop is compared to control signal (waveform above Fig. 1) serious distortion before dividing potential drop.
As shown in Figure 1, the width of its rising waveform of the control signal after dividing potential drop and falling waveform broadens and affects the degree of accuracy of measurement, therefore, is necessary that design is a kind of and has new-type measuring signal device, to reduce the degree of the control signal distortion after dividing potential drop.
Summary of the invention
An object of the present invention is to provide a kind of measuring signal device, to solve the problem of prior art.
According to a specific embodiment, measuring signal device of the present invention can be used to measure high voltage control signal, and it comprises a bleeder circuit, a low distortion impact damper and a counter.Bleeder circuit is used for receiving high voltage control signal, and carries out dividing potential drop to obtain voltage division signal to high voltage control signal.Low distortion impact damper connects bleeder circuit to receive voltage division signal, and wherein, low distortion impact damper can be used to the rising waveform and the falling waveform that keep voltage division signal, makes its corresponding high voltage control signal.Counter is connected to low distortion impact damper, can be used to the rising waveform of calculating partial pressure signal and the switching time of falling waveform.
In this specific embodiment, low distortion impact damper comprises impedance module and push-and-pull module further, and wherein, impedance module is connected to bleeder circuit, and push-and-pull model calling is to impedance module.Impedance module can provide input impedance, makes voltage division signal that rising waveform can be kept to make it correspond to the rising waveform of high voltage control signal, and push-and-pull module then can make voltage division signal keep falling waveform to make it correspond to the falling waveform of high voltage control signal.By low distortion impact damper, can keep the overall waveform of voltage division signal, make its corresponding high voltage control signal, therefore measuring signal device can measure the switching time of the high voltage control signal that light emitting diode control device exports exactly.
Can be further understood by following detailed Description Of The Invention and institute's accompanying drawings about the advantages and spirit of the present invention.
Accompanying drawing explanation
The waveform schematic diagram of the control signal before Fig. 1 illustrates the dividing potential drop of prior art and after dividing potential drop;
Fig. 2 illustrates the functional block diagram of the measuring signal device according to a specific embodiment of the present invention;
Fig. 3 illustrates the schematic diagram of the measuring signal device according to another specific embodiment of the present invention;
Fig. 4 illustrates high voltage control signal and the waveform schematic diagram of voltage division signal after low distortion impact damper of Fig. 3.
Wherein, description of reference numerals is as follows:
1,2: measuring signal device; 10,20: bleeder circuit;
12,22: low distortion impact damper; 14,24: counter;
200: input point; 202: output point;
220: impedance module; 222: push-and-pull module;
240: counting unit; 242: timing unit;
2200: junction field effect transistor; 2202: current mirror;
2220: the first bipolar junction transistors;
2222: the second bipolar junction transistors;
2400: comparer; 2402: the first amplifiers;
2404: the second amplifiers; 2406: processor;
R1, R2: resistance; C1, C2: electric capacity;
S1: high voltage control signal; S2: voltage division signal.
Embodiment
Refer to Fig. 2, Fig. 2 illustrates the functional block diagram of the measuring signal device 1 according to a specific embodiment of the present invention.As shown in Figure 2, measuring signal device 1 comprises bleeder circuit 10, low distortion impact damper 12 and counter 14, and wherein, low distortion impact damper 12 is connected to bleeder circuit 10, and counter 14 is connected to low distortion impact damper 12.In practice, bleeder circuit 10 can be connected to the output pin position of light emitting diode control device (not being illustrated in figure), be used for receiving control device export high voltage control signal, in this, high voltage control signal pulse width modulation signal.
When high voltage control signal is through bleeder circuit 10, its voltage is exported a voltage division signal to low distortion impact damper 12 by dividing potential drop.The voltage of voltage division signal is less than a preset value, and this preset value is the voltage that can bear according to the integrated circuit of measuring signal device 1 sets, and such as, is 24 volts according to the voltage sets preset value that can bear.Then, the waveform that low distortion impact damper 12 can make voltage division signal remain corresponding with high voltage control signal, in detail, the rising waveform of voltage division signal is identical substantially with falling waveform with the rising waveform of the switching time of falling waveform and high voltage control signal.Counter 14 can the rising waveform of calculating partial pressure signal and the switching time of falling waveform, and due to the rising waveform of voltage division signal and the switching time of falling waveform identical substantially with the switching time of falling waveform with the rising waveform of high voltage control signal, therefore counter 14 calculate obtain the switching time that namely can be considered high voltage control signal switching time.
Refer to Fig. 3, Fig. 3 illustrates the schematic diagram of the measuring signal device 2 according to another specific embodiment of the present invention.As shown in Figure 3, measuring signal device 2 comprises bleeder circuit 20 equally, is connected to the low distortion impact damper 22 of bleeder circuit 20 and is connected to the counter 24 of low distortion impact damper 22.
In this specific embodiment, bleeder circuit 20 is formed by resistance R1, resistance R2, electric capacity C1 and electric capacity C2, as shown in Figure 3, wherein, the resistance value of the capacitance difference build-out resistor R2 and resistance R1 of electric capacity C1 and electric capacity C2, for example, if the resistance value of resistance R1 is 9M Ω and the resistance value of resistance R2 is 1M Ω, the capacitance of electric capacity C1 and C2 is then set as 1F and 9F accordingly.The input point 200 of bleeder circuit 20 can be connected to light emitting diode control device (not being illustrated in figure) to receive high voltage control signal S1, and through the arrangement of above-mentioned resistance value, high voltage control signal S1 can be carried out dividing potential drop by bleeder circuit 20, and is the voltage division signal S2 of 1/10th of high voltage control signal S1 in output point 202 output voltage.Note that the voltage of the voltage that above-mentioned resistance value can bear according to measuring signal device 2 integrated circuit in practice and high voltage control signal designs, be not limited to the numerical value that this specific embodiment proposes.
If namely high voltage control signal S1 measures merely through bleeder circuit 20 dividing potential drop, due to the existence of stray capacitance on the circuit board of measuring equipment, the rising waveform of voltage division signal S2 and the width of falling waveform can broaden and distortion.In this specific embodiment, low distortion impact damper 22 can keep the rising waveform of voltage division signal S2 and falling waveform to make it undistorted.Low distortion impact damper 22 comprises impedance module 220 and push-and-pull module 222 further, and wherein, impedance module 220 is connected to the output point 202 of bleeder circuit 20 to receive voltage division signal S2, and push-and-pull module 222 is connected to impedance module 220.
Impedance module 220 comprises junction field effect transistor (junctionfieldeffecttransistor, JFET) 2200 and current mirror 2202, and its connected mode as shown in Figure 3.When the output point 202 of bleeder circuit 20 exports voltage division signal S2 to impedance module 220, impedance module 220 couples of voltage division signal S2 provide high impedance, such as, 109 Ω, by this, impedance module 220 can maintain the rising waveform of voltage division signal S2, makes the rising waveform of its corresponding high voltage control signal S1 and can not distortion, in other words, the width of the rising waveform of voltage division signal S2 is approximately identical with the width of the rising waveform of high voltage control signal S1.
Push-and-pull module 222 is connected to impedance module 220, and it comprises the first bipolar junction transistor (bipolarjunctiontransistor, BJT) 2220 and the second bipolar junction transistor 2222, and both connected modes as shown in Figure 3.Push-and-pull module 222 self-impedance module 220 can receive voltage division signal S2, and is exported to counter 24.By this, push-and-pull module 222 can maintain the falling waveform of voltage division signal S2, make the falling waveform of its corresponding high voltage control signal S1 and can not distortion, in other words, the width of the falling waveform of voltage division signal S2 is approximately identical with the width of the falling waveform of high voltage control signal S1.
See also Fig. 3 and Fig. 4, Fig. 4 illustrates high voltage control signal S1 and the waveform schematic diagram of voltage division signal S2 after low distortion impact damper 22 of Fig. 3.As shown in Figure 4, high voltage control signal S1 is different from the voltage swing of voltage division signal S2, but the width of both rising waveform and falling waveform is suitable.Therefore, the switching time of the rise and fall waveform of counter 24 calculating partial pressure signal S2, namely can be derived from the switching time of the rise and fall waveform of high voltage control signal S1.
In this specific embodiment, counter 24 includes counting unit 240 and timing unit 242 further, and wherein timing unit 242 connection count unit 240 is to provide time signal to timing unit 242, and this time signal can be used to computing time.In practice, timing unit 242 can be, but is not limited to, field programmable logic gate array (Field-ProgrammableGateArray, FPGA), and its time signal can meet the temporal analytical density of pS.
Counting unit 240 can comprise the comparer 2400 being connected to low distortion impact damper 22, and it receives the voltage division signal S2 that exported by low distortion impact damper 22, and the rising waveform of voltage division signal S2 and falling waveform and reference voltage level is compared.Comparer 2400 comprises the first amplifier 2402 and the second amplifier 2404, wherein, the first amplifier 2402 can receive first and presets switched voltage (reference voltage level) and the second amplifier 2404 and can receive second and preset switched voltage (reference voltage level).When comparer 2400 receives voltage division signal S2, its rising waveform and first can be preset switched voltage and continue to compare, once the voltage of rising waveform is greater than first preset switched voltage, is about to output signal and switches to High by Low.On the other hand, the falling waveform of voltage division signal S2 and second also can be preset switched voltage and continue to compare by comparer 2400, and the voltage once falling waveform is less than second and presets switched voltage, is about to output signal and switches to High by Low.
In practice, the first predeterminated voltage and the second predeterminated voltage can set according to the voltage of voltage division signal.For example, if the voltage of the voltage division signal after low distortion impact damper is 10 volts, then can set the first predeterminated voltage and the second predeterminated voltage is 5 volts, that is, the mid point of rising waveform and falling waveform.
In this specific embodiment, counting unit 240 comprises processor 2406 further, and it is connected with comparer 2400 and timing unit 242.Processor 2406 receives the output signal of comparer 2400, judges the rising waveform of voltage division signal S1 and the switching of falling waveform by this.For example, when comparer 2400 compare rising waveform and first preset output signal is switched to High by Low after switched voltage time, processor 2406 judges that this rising waveform switches.In addition, processor 2406 can self clock unit 242 continuous reception time signal, after it judges that rising waveform switches, namely calculates the switching time of rising waveform according to rising waveform and time signal.On the other hand, processor 2406 also can calculate the switching time of falling waveform after judging that falling waveform switches according to falling waveform and time signal.
In another specific embodiment, the low distortion impact damper of measuring signal device can be connected wave filter with between counter, in order to filter the noise in voltage division signal.By this, noise effect counter can be avoided rising waveform or the judgement of falling waveform switching time.
In sum, measuring signal device of the present invention can be used to the high voltage control signal that measurement light emitting diode control device exports, and it comprises bleeder circuit, low distortion impact damper and counter.The output pin position of bleeder circuit autoluminescence diode control device receives high voltage control signal, and carries out dividing potential drop to high voltage control signal and produce the voltage division signal that measuring signal device integrated circuit can bear.Voltage division signal is through low distortion impact damper, and its rising waveform and falling waveform maintain the rising waveform corresponding with high voltage control signal and falling waveform.Counter from low distortion buffer inputs voltage division signal, and judges whether to switch to its rising waveform and falling waveform and calculates switching time.Compared to prior art, high voltage control signal can be divided the voltage range being depressed into and can bearing by measuring signal device of the present invention, and the rise and fall waveform utilizing low distortion impact damper to maintain voltage division signal makes it undistorted, by this, measuring signal device accurately can measure high voltage control signal, to guarantee the accuracy of light-emitting diode assembly switching time.
By the above detailed description of preferred embodiments, be wish clearly to describe feature of the present invention and spirit, and not with above-mentioned disclosed preferred embodiment, category of the present invention limited.On the contrary, its objective is wish to contain various change and tool equality be arranged in the present invention institute in the category of Patent right requirement scope applied for.Therefore, the category of the Patent right requirement scope that the present invention applies for should do the broadest explanation, with the arrangement causing it to contain all possible change and tool equality according to above-mentioned explanation.
Claims (9)
1. a measuring signal device, in order to measure a high voltage control signal, this measuring signal device comprises:
One bleeder circuit, in order to carry out dividing potential drop to this high voltage control signal, to obtain a voltage division signal;
One low distortion impact damper, connects this bleeder circuit, and this low distortion impact damper, in order to keep a rising waveform and a falling waveform of this voltage division signal, makes it to should the waveform of high voltage control signal; And
One counter, connects this low distortion impact damper, this counter in order to the switching time of this rising waveform and this falling waveform of calculating this voltage division signal,
Wherein this low distortion impact damper comprises an impedance module and connects a push-and-pull module of this impedance module, this impedance module connects this bleeder circuit and provides an input impedance to keep this rising waveform of this voltage division signal, and this push-and-pull module is in order to keep this falling waveform of this voltage division signal.
2. measuring signal device according to claim 1, wherein this impedance module comprises a junction field effect transistor and a current mirror.
3. measuring signal device according to claim 1, wherein this push-and-pull module comprises two bipolar junction transistors.
4. measuring signal device according to claim 1, wherein the magnitude of voltage of this high voltage control signal is greater than 24 volts.
5. measuring signal device according to claim 1, wherein this counter comprises a timing unit and connects a counting unit of this timing unit, this timing unit is in order to provide a time signal, and this counting unit calculates switching time in order to coordinate this time signal respectively to this rising waveform of this voltage division signal and this falling waveform.
6. measuring signal device according to claim 5, wherein this counting unit comprises the comparer connecting this low distortion impact damper, this comparer presets switched voltage in order to this rising waveform and one first continuing to compare this voltage division signal, when the voltage that this comparer compares this rising waveform is greater than this first default switched voltage, this counting unit judges that this voltage division signal switches, and this comparer presets switched voltage in order to this falling waveform and one second continuing to compare this voltage division signal, when the voltage that this comparer compares this falling waveform is less than this second default switched voltage, this counting unit judges that this voltage division signal switches.
7. measuring signal device according to claim 6, wherein this counting unit according to judge this rising waveform of carrying out switching and this time signal, obtain the switching time of this rising waveform.
8. measuring signal device according to claim 6, wherein this counting unit according to judge this falling waveform of carrying out switching and this time signal, obtain the switching time of this falling waveform.
9. measuring signal device according to claim 1, comprises the wave filter be connected between this low distortion impact damper and this counter further, and this wave filter is in order to filter the noise in this voltage division signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210233698.2A CN103529307B (en) | 2012-07-06 | 2012-07-06 | Measuring signal device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210233698.2A CN103529307B (en) | 2012-07-06 | 2012-07-06 | Measuring signal device |
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| CN103529307A CN103529307A (en) | 2014-01-22 |
| CN103529307B true CN103529307B (en) | 2015-11-18 |
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| CN201210233698.2A Expired - Fee Related CN103529307B (en) | 2012-07-06 | 2012-07-06 | Measuring signal device |
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| CN106324346B (en) * | 2015-06-25 | 2019-03-22 | 台湾类比科技股份有限公司 | Waveform drop point detection circuit |
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| EP0456482A1 (en) * | 1990-05-11 | 1991-11-13 | Idec Izumi Corporation | Photoelectrical switching circuit |
| CN101349717A (en) * | 2007-07-16 | 2009-01-21 | 奇景光电股份有限公司 | Jitter measuring device and method |
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| CN202111690U (en) * | 2011-06-03 | 2012-01-11 | 高博 | Digital analog converter |
| CN102737718A (en) * | 2011-03-30 | 2012-10-17 | 联发科技股份有限公司 | Apparatus and method to adjust clock duty cycle of memory |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS63293475A (en) * | 1987-05-27 | 1988-11-30 | Hitachi Ltd | Measurement system for duty ratio |
| TWM346801U (en) * | 2008-05-09 | 2008-12-11 | Princeton Technology Corp | Testing device |
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2012
- 2012-07-06 CN CN201210233698.2A patent/CN103529307B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0456482A1 (en) * | 1990-05-11 | 1991-11-13 | Idec Izumi Corporation | Photoelectrical switching circuit |
| CN101473403A (en) * | 2006-03-17 | 2009-07-01 | 施耐德自动化公司 | Current-based method and apparatus for detecting and classifying arcs |
| CN101349717A (en) * | 2007-07-16 | 2009-01-21 | 奇景光电股份有限公司 | Jitter measuring device and method |
| CN102737718A (en) * | 2011-03-30 | 2012-10-17 | 联发科技股份有限公司 | Apparatus and method to adjust clock duty cycle of memory |
| CN202111690U (en) * | 2011-06-03 | 2012-01-11 | 高博 | Digital analog converter |
Non-Patent Citations (1)
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| VXI总线高速高精度数据采集模块的设计与实现;孙阳等;《电测与仪表》;20021031;第39卷(第442期);第31-34、44页 * |
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