CN103795376B - A kind of wide duty ratio modulation circuit of wideband - Google Patents
A kind of wide duty ratio modulation circuit of wideband Download PDFInfo
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- CN103795376B CN103795376B CN201410072863.XA CN201410072863A CN103795376B CN 103795376 B CN103795376 B CN 103795376B CN 201410072863 A CN201410072863 A CN 201410072863A CN 103795376 B CN103795376 B CN 103795376B
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Abstract
The invention discloses a kind of wide duty ratio modulation circuit of wideband, including regulated power supply system, base control pulse-generating circuit, light source control and modulate and control impulse generation circuit, modulation circuit and signal processing circuitry；The present invention the wide duty ratio modulation circuit of wideband, the limitation for impulse modulation dutycycle numerical value of having determined, in theory dutycycle size do not influence data acquisition, dutycycle can reach 1：1500 even more highs, the life-span of light source can be greatly prolonged；2nd, for tiny signal, the present invention can be very good to gather, and can eliminate frequency interferences well, and 3, zero point error and temperature drift are minimum, can be widely applied to the processing of precision instrument modulated-analog signal.
Description
Technical field
The present invention relates to analogue signal processing field, more particularly to a kind of modulation electricity for instrument analog signal processing
Road.
Background technology
Modulation system can be divided into analog-modulated and digital modulation according to the property of modulated signal, according to carrier waveform modulation methods
Formula can be divided into continuous wave modulation and the class of pulse wave modulation two；
In deep ultraviolet LED using upper, existing deep ultraviolet LED light source circuit uses analog signal modulation circuit, present day analog
Signal modulation circuit has following limitation：
Fixed signal dutycycle is about 1：1, it is very micro- for the signal collected if duty cycle signals are too small
It is weak, it is unfavorable for the enhanced processing of later stage signal；
Bad signal or switch initial signal are easily superimposed in signal acquisition process, the accuracy of signal can be influenceed；
Analog signal is gathering and is using RC filtering in processing procedure, can influence to gather the response time of signal, and
The intensity of collection valid data can be reduced, due to that using RC network, there can be frequency resonance problems, and RC network can influence to gather
Signal it is linear, null offset, temperature drift are big.
These influence, for deep ultraviolet LED, it is impossible to ensure deep ultraviolet LED service lifes, and toggle speed enough
Slowly, generally in 10us levels.
And in precision instrument manufacturing process, many enterprises are in order to improve the stability of instrumented data, reference signal
It is big as transmission signal is done as far as possible, even so, there is the problem of expanding with heat and contract with cold because instrument varies with temperature machinery, institute
It is still unstable with instrumented data；
And this modulation circuit can solves this problem very well, Machine Design can be not only greatly simplified, and can be with
Make data more stable.
The content of the invention
(1) technical problems to be solved
In order to solve the above problems, the present invention proposes a kind of wide duty ratio modulation circuit of wideband, solves impulse modulation and accounts for
The empty limitation than numerical value, for tiny signal, the present invention can be very good to gather, and frequency interferences can be eliminated well, in zero point
Error performance is minimum in terms of drift and temperature drift, can be widely applied to the processing of precision instrument modulated-analog signal.
(2) technical scheme
A kind of wide duty ratio modulation circuit of wideband of the present invention, including regulated power supply system, base control pulses generation electricity
Road, light source control and modulate and control impulse generation circuit, modulation circuit and signal processing circuitry；
The regulated power supply system is 3 power-supply systems, and voltage-stabilized power supply is made up of transformer, rectistack and regulator block, output
Voltage is+5V and ± 12V；
The base control pulse-generating circuit connects with light source control and modulate and control impulse generation circuit；
CP+ the and CP- ends of light source control and the modulate and control impulse generation circuit and modulation circuit and signal transacting electricity
9 pin of the CD4052BC chips in the system of road and the connection of 10 pin；
The modulation circuit and signal processing circuitry are made up of modulation circuit and difference amplifier；Modulation circuit and letter
Number process circuit system voltage output end is connected with A/D change-over circuits.
Further, the base control pulse-generating circuit dutycycle can reach 1：1500.
Further, the transformer of the regulated power supply system is bilateral transformer, and transformer output connects with rectistack,
The output end of rectistack connects with regulator block, and regulator block includes MC7805, MC7812 and MC7912.
Further, the base control pulse-generating circuit core is made up of NE555 triggers.
Further, light source control and modulate and control impulse the generation circuit core is made up of SN74132N.
Further, the modulation circuit and signal processing circuitry are made up of CD4052BC and difference amplifier,
CD4052BC receives the LED ends detectable signal from light source control and modulate and control impulse generation circuit, passes through electric capacity C3 and electricity
Hold C7 charge and discharge electro ultrafiltration, the CD4052BC low and high levels exported are stored, C3 and C7 low and high level signal is distinguished
Positive-negative input end of differential amplifier circuit is sent to, after amplification and filtering process, obtains stable modulated signal.
(3) beneficial effect
Compared with prior art, it has the advantages that the present invention：A kind of wide dutycycle of wideband of the present invention is adjusted
Circuit processed, solves the limitation of impulse modulation dutycycle numerical value, dutycycle size does not influence data acquisition in theory, and dutycycle can
To reach 1：1500 even more highs, the life-span of light source can be greatly prolonged；2nd, for tiny signal, the present invention can be very good to adopt
Collection, can eliminate frequency interferences well, and 3, zero point error and temperature drift are minimum, can be widely applied to precision instrument simulation and adjust
Signal processing.
Using this modulation circuit system, the design of detection circuit can be greatly simplified, the dark current of detector can be supported
Disappear, without considering influence of the dark current to measurement data；And the temperature drift of detectable signal amplifying circuit is eliminated,
Without the ratio problems for considering transmission signal and reference signal.
Brief description of the drawings
Fig. 1 is the system connection figure of the present invention；
Fig. 2 is the regulated power supply system circuit theory diagrams of the present invention；
Fig. 3 is the base control pulse-generating circuit schematic diagram of the present invention；
Fig. 4 is the light source control and modulate and control impulse generation circuit schematic diagram of the present invention；
Fig. 5 is the modulation circuit and signal processing circuitry circuit theory diagrams of the present invention；
Embodiment
As shown in figure 1, a kind of wide duty ratio modulation circuit of wideband of the present invention, including regulated power supply system, base control
Pulse-generating circuit, light source control and modulate and control impulse generation circuit, modulation circuit and signal processing circuitry；
The regulated power supply system is 3 power-supply systems, and voltage-stabilized power supply is made up of transformer, rectistack and regulator block, output
Voltage is+5V and ± 12V；
The base control pulse-generating circuit connects with light source control and modulate and control impulse generation circuit；
CP+ the and CP- ends of light source control and the modulate and control impulse generation circuit and modulation circuit and signal transacting electricity
9 pin of the CD4052BC chips in the system of road and the connection of 10 pin；
The modulation circuit and signal processing circuitry are made up of modulation circuit and difference amplifier；Modulation circuit and letter
Number process circuit system voltage output end is connected with A/D change-over circuits.
Further, the base control pulse-generating circuit dutycycle can reach 1：1500.
As shown in Fig. 2 the transformer of the regulated power supply system is bilateral transformer, transformer output and rectistack connect
Connect, the output end of rectistack connects with regulator block, and regulator block includes MC7805, MC7812 and MC7912.
As shown in figure 3, the base control pulse-generating circuit core is made up of NE555 triggers, concussion frequency by R1,
R2 and C1 determines that dutycycle is approximately equal to R2/R1, NE555 3 pin output base control pulse signal, makes for circuit below
With.
As shown in figure 4, the light source control and modulate and control impulse generation circuit core are made up of SN74132N, VK_GY
For light source control signal end, when the terminal is hanging or increases level (5V), light source is in normal burst working condition, and the terminal connects
During ground, light source LD/LED by CP Pulse Width Controls, is not closed, in the operating condition, CP control signals through twice with it is non-
After door X1A and X1C conversions, for as light source control signal, it and the same phase of CP pulses, i.e., light source when CP is high level
Open, it is in running order,
When CP signals are low level, light source is closed, in off working state.
The acquisition of CP+ pulse signals：CP pulse signals carry out 2 reversions, obtained letter by 2 NAND gates X1B and X2B
Number actually with the same phases of CP, then by 1 RC charge-discharge circuit delay a period of time, then by 2 NAND gates X2C and X2D
Corresponding waveform is converted to, main function is to filter the CP positive pulses unstable part high level letter of detectable signal for the previous period
Number；
The acquisition of CP- pulse signals：CP pulses are inverted by 1 NAND gate X1B, then pass through 1 RC discharge and recharge
Circuit delay for a period of time, is then converted to corresponding waveform, main function is to filter CP by 2 NAND gates X1D and X2A
The low level unstable part low level signal of detectable signal for the previous period.
As shown in figure 5, the modulation circuit and signal processing circuitry are made up of CD4052BC and difference amplifier,
CD4052BC receives the LED ends detectable signal from light source control and modulate and control impulse generation circuit, passes through electric capacity C3 and electricity
Hold C7 charge and discharge electro ultrafiltration, the CD4052BC low and high levels exported are stored, C3 and C7 low and high level signal is distinguished
Positive-negative input end of differential amplifier circuit is sent to, after amplification and filtering process, obtains stable modulated signal；
Specifically, the pin of the 4 of Y-signal, 5 and 1 is hanging, 11,15 and 12 pin of X signal are hanging, when X connects with Y-signal, vacantly
Pin will not be had a huge impact to signal, and the LD/LED in light source control and modulate and control impulse generation circuit is detected into letter
Electronic switch CD4052BC 3 and 13 pin number are directly sent to, because CD4052BC has leakage current small (good insulation preformance) and opens
Small characteristic is hindered inside the Pass, according to CD4053 logic feature, when 9 pin CP+ send positive pulse, 3 pin and 2 pin turn on,
High level current potential is saved in small capacitances C3, because CD4052BC has small characteristic of leaking electricity, so when 9 pin CP+ send low electricity
When flat, 3 pin and 2 pin disconnect, and C3 still remains substantially original high level signal, similarly, when 10 pin CP- send positive pulse
When, 13 pin and 14 pin are turned on, and low-potential signal is stored in small capacitances C7, are also due to small, 10 pin of CD4052BC electric leakages
When CP- sends low level, 13 pin and 14 pin disconnect, and C7 remains to keep substantially original low level signal；
C3 plays a part of high level memory, and C7 plays a part of low level memory, then C3 and C7 height
Level signal is sent to positive-negative input end of differential amplifier circuit respectively, after amplification and filtering process, can obtain
Stable modulated signal.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the structure of the present invention
Think and scope is defined.On the premise of design concept of the present invention is not departed from, technology of the ordinary people in the field to the present invention
The all variations and modifications that scheme is made, all should drop into protection scope of the present invention, the claimed technology contents of the present invention,
All record in detail in the claims.
Claims (6)
- A kind of 1. wide duty ratio modulation circuit of wideband, it is characterised in that：Including regulated power supply system, base control pulses generation electricity Road, light source control and modulate and control impulse generation circuit, modulation circuit and signal processing circuitry；The regulated power supply system is 3 power-supply systems, and voltage-stabilized power supply is made up of transformer, rectistack and regulator block, output voltage For+5V and ± 12V；The base control pulse-generating circuit connects with light source control and modulate and control impulse generation circuit；CP+ the and CP- ends of light source control and the modulate and control impulse generation circuit and modulation circuit and signal processing circuit system 9 pin of the CD4052BC chips in system and the connection of 10 pin；The modulation circuit and signal processing circuitry are made up of modulation circuit and difference amplifier；At modulation circuit and signal Reason circuit system voltage output end is connected with A/D change-over circuits.
- A kind of 2. wide duty ratio modulation circuit of wideband according to claim 1, it is characterised in that：The base control pulse Generation circuit dutycycle can reach 1：1500.
- A kind of 3. wide duty ratio modulation circuit of wideband according to claim 1, it is characterised in that：The regulated power supply system Transformer be bilateral transformer, transformer output connects with rectistack, and the output end of rectistack connects with regulator block, regulator block Including MC7805, MC7812 and MC7912.
- A kind of 4. wide duty ratio modulation circuit of wideband according to claim 1, it is characterised in that：The base control pulse Generation circuit core is made up of NE555 triggers.
- A kind of 5. wide duty ratio modulation circuit of wideband according to claim 1, it is characterised in that：The light source control and tune System control pulse-generating circuit core is made up of SN74132N.
- A kind of 6. wide duty ratio modulation circuit of wideband according to claim 1, it is characterised in that：The modulation circuit and letter Number process circuit system is made up of CD4052BC and difference amplifier, and CD4052BC is received and come from light source control and modulation control arteries and veins The LED ends detectable signal of generation circuit is rushed, by electric capacity C3 and electric capacity C7 charge and discharge electro ultrafiltration, the height that CD4052BC is exported Level storage is got up, and C3 and C7 low and high level signal is sent to positive-negative input end of differential amplifier circuit respectively, by putting After big effect and filtering process, stable modulated signal is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410072863.XA CN103795376B (en) | 2014-03-03 | 2014-03-03 | A kind of wide duty ratio modulation circuit of wideband |
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| CN201410072863.XA CN103795376B (en) | 2014-03-03 | 2014-03-03 | A kind of wide duty ratio modulation circuit of wideband |
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| CN103795376B true CN103795376B (en) | 2018-04-03 |
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| CN109120247A (en) * | 2018-08-31 | 2019-01-01 | 天津大学 | A kind of burst pulse method for generation of low cost miniaturization |
| CN111768585A (en) * | 2020-06-30 | 2020-10-13 | 亳州职业技术学院 | Convenient access control alarm system of hotel guest room |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009123677A (en) * | 2007-10-24 | 2009-06-04 | Toshiba Lighting & Technology Corp | Lighting device and lighting fixture |
| CN102307044A (en) * | 2011-09-14 | 2012-01-04 | 深圳航天科技创新研究院 | Switching power supply PWM (pulse width modulation) controller with variable frequencies |
| CN102624368A (en) * | 2012-03-27 | 2012-08-01 | 湖南南车时代电动汽车股份有限公司 | Pulse width modulation implementation method for random switching frequency of power electronic device |
| CN102638246A (en) * | 2012-04-25 | 2012-08-15 | 上海宏力半导体制造有限公司 | Duty ratio regulating circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8169205B2 (en) * | 2009-05-26 | 2012-05-01 | Silergy Technology | Control for regulator fast transient response and low EMI noise |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009123677A (en) * | 2007-10-24 | 2009-06-04 | Toshiba Lighting & Technology Corp | Lighting device and lighting fixture |
| CN102307044A (en) * | 2011-09-14 | 2012-01-04 | 深圳航天科技创新研究院 | Switching power supply PWM (pulse width modulation) controller with variable frequencies |
| CN102624368A (en) * | 2012-03-27 | 2012-08-01 | 湖南南车时代电动汽车股份有限公司 | Pulse width modulation implementation method for random switching frequency of power electronic device |
| CN102638246A (en) * | 2012-04-25 | 2012-08-15 | 上海宏力半导体制造有限公司 | Duty ratio regulating circuit |
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