CN202906863U - Device for adjusting pulse width - Google Patents
Device for adjusting pulse width Download PDFInfo
- Publication number
- CN202906863U CN202906863U CN 201220543994 CN201220543994U CN202906863U CN 202906863 U CN202906863 U CN 202906863U CN 201220543994 CN201220543994 CN 201220543994 CN 201220543994 U CN201220543994 U CN 201220543994U CN 202906863 U CN202906863 U CN 202906863U
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage comparator
- voltage
- timers
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses a device for adjusting pulse width, comprising a simulation oscillation circuit capable of generating a sawtooth wave, a voltage adjusting module and a voltage comparator. The simulation oscillation circuit is connected with a power supply and the reverse-phase end of the voltage comparator separately, the voltage adjusting module is connected with the power supply and the in-phase end of the voltage comparator separately, the power supply end of the voltage comparator is connected with the power supply, and the output end of the voltage comparator is connected with a load. The device for adjusting the pulse width of the utility model does not need programming and debugging, and is simple in circuit, lower in cost and reliable in performance.
Description
Technical field
The utility model relates to the signal modulation technique field, relates in particular to a kind of device of realizing pulse width modulation.
Background technology
In the general application circuit, when need to use pulse width modulation, adopt possesses the single-chip microcomputer of PWM output port and cooperates software to realize more.Yet single-chip microcomputer need to carry out detail programming, complicated operation, and cost is higher.
China Patent Publication No. CN201898491U, open day July 13 in 2011, the name of utility model is called pwm generator, this application case discloses a kind of pwm generator, it comprises interconnective Field Programmable Gate Array and single-chip microcomputer, the internal circuit of Field Programmable Gate Array is set to N and catches the comparator parallel connection, and each seizure comparator is connected with address decoder, counter respectively, and address decoder is connected with counter.Its weak point is, this pwm generator adopts Field Programmable Gate Array and single-chip microcomputer to cooperate and realizes pulse width modulation, need to carry out detail programming, complicated operation, and cost is higher.
The utility model content
The purpose of this utility model is to overcome existing pulse width modulation device employing to possess the single-chip microcomputer of PWM output port and cooperate software to realize, need to carry out detail programming, complicated operation, and the technical problem that cost is higher, a kind of device of realizing pulse width modulation is provided, and it need not to carry out detail programming, and circuit is simple, cost is lower, dependable performance.
In order to address the above problem, the utility model is achieved by the following technical solutions:
A kind of device of realizing pulse width modulation of the present utility model, comprise simulation oscillating circuit, Voltage Regulator Module and the voltage comparator that can produce sawtooth waveforms, described simulation oscillating circuit links to each other with the end of oppisite phase of power supply and voltage comparator respectively, described Voltage Regulator Module links to each other with the in-phase end of power supply and voltage comparator respectively, the power end of described voltage comparator links to each other with power supply, and the output of voltage comparator links to each other with load.
In the technical program, the simulation oscillating circuit produces the end of oppisite phase that sawtooth waveforms is input to voltage comparator, the input voltage of Voltage Regulator Module regulation voltage comparator in-phase end.Voltage comparator compares the input voltage of in-phase end and end of oppisite phase.When in-phase end voltage is higher than end of oppisite phase voltage, voltage comparator output output high level; When in-phase end voltage is lower than end of oppisite phase voltage, voltage comparator output output low level.
The user can be by the input voltage of Voltage Regulator Module regulation voltage comparator in-phase end, when the input voltage of voltage comparator in-phase end changes between the crest of the sawtooth waveforms that the simulation oscillating circuit produces and trough, the output of voltage comparator is exported the voltage signal of different pulse durations, thereby realizes the adjusting of pulse duration.
As preferably, described simulation oscillating circuit comprises 555 timers, resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and capacitor C 2,1 pin ground connection of 555 timers, 2 pin of 555 timers respectively with resistance R 2 one ends, resistance R 3 one ends, 6 pin of capacitor C 1 one ends and 555 timers link to each other, resistance R 3 other ends link to each other with the end of oppisite phase of voltage comparator, capacitor C 1 other end ground connection, resistance R 2 other ends link to each other with 7 pin of resistance R 1 one ends and 555 timers respectively, resistance R 1 other end respectively with positive source, 4 pin of 555 timers link to each other with 8 pin of 555 timers, 5 pin of 555 timers link to each other with capacitor C 2 one ends, capacitor C 2 other end ground connection.
When the voltage of capacitor C 1 upper end was lower than 1/3 supply voltage (namely 2 pin voltages of 555 timers are lower than 1/3 supply voltage), 7 pin of 555 timers output high level charged to capacitor C 1.Voltage when capacitor C 1 upper end is higher than 2/3 supply voltage when (namely 6 pin voltages of 555 timers are higher than 2/3 supply voltage) after charging, 7 pin output low levels of 555 timers, voltage on the capacitor C 1 is by resistance R 2 discharges, until the voltage on the capacitor C 1 is lower than 1/3 supply voltage at this moment.Capacitor C 1 constantly discharges and recharges, and produces the end of oppisite phase that sawtooth waveforms sends to voltage comparator, and the crest of sawtooth waveforms is 2/3 supply voltage, and trough is 1/3 supply voltage.
As preferably, described Voltage Regulator Module comprises resistance R 4 and adjustable resistance VR, and described resistance R 4 one ends link to each other with positive source, and resistance R 4 other ends link to each other with the in-phase end of adjustable resistance VR one end and voltage comparator respectively, adjustable resistance VR other end ground connection.The user can change by the resistance of regulating adjustable resistance VR the input voltage of voltage comparator in-phase end.
The beneficial effects of the utility model are: need not to carry out detail programming, circuit is simple, and cost is lower, dependable performance.
Description of drawings
Fig. 1 is that a kind of circuit theory of the present utility model connects block diagram;
Fig. 2 is a kind of circuit theory diagrams of the present utility model.
Among the figure: 1, simulation oscillating circuit, 2, Voltage Regulator Module, 3, voltage comparator, 4, power supply, 5, load, 6,555 timers.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of device of realizing pulse width modulation of present embodiment, as shown in Figure 1, comprise simulation oscillating circuit 1, Voltage Regulator Module 2 and the voltage comparator 3 that can produce sawtooth waveforms, simulation oscillating circuit 1 links to each other with the end of oppisite phase of power supply 4 with voltage comparator 3 respectively, Voltage Regulator Module 2 links to each other with the in-phase end of power supply 4 with voltage comparator 3 respectively, the power end of voltage comparator 3 links to each other with power supply 4, and the output of voltage comparator 3 links to each other with load 5.
As shown in Figure 2, described simulation oscillating circuit 1 comprises 555 timers 6, resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and capacitor C 2,1 pin ground connection of 555 timers 6,2 pin of 555 timers 6 and resistance R 2 one ends, resistance R 3 one ends, capacitor C 1 one ends link to each other with 6 pin of 555 timers 6, resistance R 3 other ends link to each other with the end of oppisite phase of voltage comparator 3, capacitor C 1 other end ground connection, resistance R 2 other ends link to each other with 7 pin of resistance R 1 one ends with 555 timers 6, resistance R 1 other end and power supply 4 positive poles, 4 pin of 555 timers 6 link to each other with 8 pin of 555 timers 6,5 pin of 555 timers 6 link to each other with capacitor C 2 one ends, capacitor C 2 other end ground connection.Voltage Regulator Module 2 comprises resistance R 4 and adjustable resistance VR, resistance R 4 one ends and 4 anodal linking to each other of power supply, and resistance R 4 other ends link to each other with the in-phase end of adjustable resistance VR one end and voltage comparator 3, adjustable resistance VR other end ground connection.The power end of voltage comparator 3 links to each other with power supply 4, the earth terminal ground connection of voltage comparator 3, and the output of voltage comparator 3 links to each other with load 5 one ends, load 5 other end ground connection.
When the voltage of capacitor C 1 upper end was lower than 1/3 power supply, 4 voltages (namely 2 pin voltages of 555 timers 6 are lower than 1/3 power supply, 4 voltages), 7 pin of 555 timers 6 output high level charged to capacitor C 1.Voltage when capacitor C 1 upper end is higher than 2/3 power supply, 4 voltages when (namely 6 pin voltages of 555 timers 6 are higher than 2/3 power supply, 4 voltages) after charging, 7 pin output low levels of 555 timers 6, voltage on the capacitor C 1 is by resistance R 2 discharges, until the voltage on the capacitor C 1 is lower than 1/3 power supply, 4 voltages at this moment.Capacitor C 1 constantly discharges and recharges, and produces the end of oppisite phase that sawtooth waveforms sends to voltage comparator 3, and the crest of sawtooth waveforms is 2/3 power supply, 4 voltages, and trough is 1/3 power supply, 4 voltages.
The user can change by the resistance of regulating adjustable resistance VR the input voltage of voltage comparator 3 in-phase ends.Voltage comparator 3 compares the input voltage of in-phase end and end of oppisite phase.When in-phase end voltage is higher than end of oppisite phase voltage, voltage comparator 3 outputs output high level; When in-phase end voltage is lower than end of oppisite phase voltage, voltage comparator 3 output output low levels.
When the input voltage of voltage comparator 3 in-phase ends changed between the crest of the sawtooth waveforms that simulation oscillating circuit 1 produces and trough, the output of voltage comparator 3 was exported the voltage signal of different pulse durations, thereby realizes the adjusting of pulse duration.
Claims (3)
1. device of realizing pulse width modulation, it is characterized in that: comprise simulation oscillating circuit (1), Voltage Regulator Module (2) and the voltage comparator (3) that can produce sawtooth waveforms, described simulation oscillating circuit (1) links to each other with the end of oppisite phase of power supply (4) with voltage comparator (3) respectively, described Voltage Regulator Module (2) links to each other with the in-phase end of power supply (4) with voltage comparator (3) respectively, the power end of described voltage comparator (3) links to each other with power supply (4), and the output of voltage comparator (3) links to each other with load (5).
2. a kind of device of realizing pulse width modulation according to claim 1, it is characterized in that: described simulation oscillating circuit (1) comprises 555 timers (6), resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and capacitor C 2,1 pin ground connection of 555 timers (6), 2 pin of 555 timers (6) respectively with resistance R 2 one ends, resistance R 3 one ends, capacitor C 1 one ends link to each other with 6 pin of 555 timers (6), resistance R 3 other ends link to each other with the end of oppisite phase of voltage comparator (3), capacitor C 1 other end ground connection, resistance R 2 other ends link to each other with 7 pin of resistance R 1 one ends with 555 timers (6) respectively, resistance R 1 other end respectively with power supply (4) positive pole, 4 pin of 555 timers (6) link to each other with 8 pin of 555 timers (6), 5 pin of 555 timers (6) link to each other with capacitor C 2 one ends, capacitor C 2 other end ground connection.
3. a kind of device of realizing pulse width modulation according to claim 1 and 2, it is characterized in that: described Voltage Regulator Module (2) comprises resistance R 4 and adjustable resistance VR, described resistance R 4 one ends link to each other with power supply (4) is anodal, resistance R 4 other ends link to each other with the in-phase end of adjustable resistance VR one end with voltage comparator (3) respectively, adjustable resistance VR other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543994 CN202906863U (en) | 2012-10-23 | 2012-10-23 | Device for adjusting pulse width |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220543994 CN202906863U (en) | 2012-10-23 | 2012-10-23 | Device for adjusting pulse width |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202906863U true CN202906863U (en) | 2013-04-24 |
Family
ID=48127481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220543994 Expired - Lifetime CN202906863U (en) | 2012-10-23 | 2012-10-23 | Device for adjusting pulse width |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202906863U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499470A (en) * | 2022-04-06 | 2022-05-13 | 之江实验室 | Nanosecond programmable pulse signal generator |
-
2012
- 2012-10-23 CN CN 201220543994 patent/CN202906863U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499470A (en) * | 2022-04-06 | 2022-05-13 | 之江实验室 | Nanosecond programmable pulse signal generator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102769981B (en) | Intelligent constant-current driver realized by embedded chip and control method of intelligent constant-current driver | |
| CN103580000A (en) | Overvoltage protection method and circuit for switching power supply output and switching power supply provided with the circuit | |
| CN109066847A (en) | A kind of photovoltaic power generation charge-discharge control circuit | |
| CN203552117U (en) | MPPT (maximum power point tracking) solar controller | |
| CN204615628U (en) | A kind of multi-stage negative pressure produces circuit | |
| CN104378059B (en) | A kind of MPPT algorithm and hardware configuration thereof | |
| CN202906863U (en) | Device for adjusting pulse width | |
| CN203467020U (en) | Non-isolated-type LED driving circuit | |
| CN104242812A (en) | Single-chip microcomputer based solar power controller | |
| CN202721869U (en) | Embedded realization-based intelligent constant-current driver | |
| CN102014564B (en) | Practical and efficient LED drive circuit | |
| CN104955251A (en) | Voltage detecting circuit and lamp | |
| CN204482133U (en) | A kind of LED constant pressure and flow drive circuit | |
| CN203660879U (en) | Constant current/constant voltage converter based on PWM modulation | |
| CN208971166U (en) | A kind of switched charge chip and electronic equipment | |
| CN103347348B (en) | Solar LED streetlight controller | |
| CN203219580U (en) | Constant current LED driving circuit and controller thereof | |
| CN204349902U (en) | A kind of novel MPPT hardware configuration | |
| CN214175275U (en) | Novel wireless DTU | |
| CN204084253U (en) | A kind of boosting lamp string | |
| CN204652206U (en) | A kind of power-switching circuit | |
| CN203574911U (en) | Primary-side-control flyback topology circuit | |
| CN204633731U (en) | Signal generator | |
| CN203691037U (en) | Solar energy charging controller based on ATmega128 single-chip microcomputer | |
| CN203435190U (en) | Solar energy led road lamp controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
|
| CX01 | Expiry of patent term |