CN104868889A - Pulse-width modulation (PWM) power supply for performance test of automobile magnetic valve - Google Patents
Pulse-width modulation (PWM) power supply for performance test of automobile magnetic valve Download PDFInfo
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- CN104868889A CN104868889A CN201510226769.XA CN201510226769A CN104868889A CN 104868889 A CN104868889 A CN 104868889A CN 201510226769 A CN201510226769 A CN 201510226769A CN 104868889 A CN104868889 A CN 104868889A
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Abstract
The invention discloses a pulse-width modulation (PWM) power supply for a performance test of an automobile magnetic valve. The PWM power supply is characterized by comprising a singlechip, a liquid crystal display (LCD), a keyboard, a digital/analog (D/A) switching circuit, a data storage chip, a PWM generation chip, a drive circuit, and an opto-isolator circuit. The singlechip is connected with the LCD, the keyboard, the data storage chip and the D/A switching circuit. The D/A switching circuit is connected with the PWM generation chip and the drive circuit. The PWM generation chip is connected with the opto-isolator circuit. The opto-isolator circuit is connected with the drive circuit. The drive circuit is externally connected with a magnetic valve so as to output. A high-precision function generation chip MAX038 and a pulse width modulation SG3525 chip jointly form a PWM generator, and the PWM square wave generated by the PWM generator is very stable, so that the duty ratio, frequency and amplitude can change continuously according to a preset value, and the working performance of the magnetic valve can be tested.
Description
Technical field
The present invention relates to a kind of PWM power supply for vehicle electromagnetic valve performance test, belong to technical field.
Background technology
Along with the development of auto industry, the application of vehicle electromagnetic valve is more extensive, also more and more higher to the requirement of electromagnetic valve quality, detection before dispatching from the factory to electromagnetically operated valve like this just seems particularly important, except needing the quality detecting its mechanical part, also need the index that its energy long-time steady operation is provided, be therefore extremely necessary to provide simple, that vehicle electromagnetic valve performance test can the be used for PWM power supply of a kind of structure to carry out Performance Detection to vehicle electromagnetic valve.
Summary of the invention
For overcoming the deficiency that prior art exists, solve the problems of the technologies described above, the present invention proposes a kind of PWM power supply for vehicle electromagnetic valve performance test.
The present invention adopts following technical scheme: a kind of PWM power supply for vehicle electromagnetic valve performance test, it is characterized in that, comprise single-chip microcomputer, LCD, keyboard, D/A change-over circuit, pin-saving chip, there is chip in PWM, drive circuit, optical coupling isolation circuit, described single-chip microcomputer respectively with described LCD, described keyboard, described pin-saving chip, described D/A change-over circuit is connected, chip is there is respectively in described D/A change-over circuit with described PWM, described drive circuit is connected, there is chip and be connected with described optical coupling isolation circuit in described PWM, described optical coupling isolation circuit is connected with described drive circuit, the external electromagnetically operated valve of described drive circuit exports.
Preferably, keyboard is used for arranging system running state and system parameters, and LCD is used for running status, the controling parameters of display system.
Preferably, the external protective circuit of drive circuit, is used for protecting drive circuit, prevents the situation of overvoltage, overcurrent.
Preferably, optical coupling isolation circuit is used for pwm control signal and voltage amplitude amplifying signal to keep apart, the noise signal in elimination input circuit, the common land clutter signal in output loop.
Preferably, optical coupling isolation circuit adopts photoisolator 6N137.
Preferably, single-chip microcomputer adopts AT89C55 single-chip microcomputer.
Preferably, there is chip employing MAX038 chip and SG3525 chip in PWM.
Preferably, pin-saving chip adopts AT24C02EEPROM chip.
The beneficial effect that the present invention reaches: adopt high accuracy function generation chip MAX038 and pulse-width modulation SG3525 chip to combine formation PWM generator, controlled through D/A by single-chip microcomputer, the PWM square wave produced is highly stable, achieve duty ratio, frequency and amplitude and according to set point consecutive variations, the difficult problem that electromagnetic valve work performance cannot be tested can be solved.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Fig. 1 is structured flowchart of the present invention, the present invention proposes a kind of PWM power supply for vehicle electromagnetic valve performance test, it is characterized in that, comprise single-chip microcomputer, LCD, keyboard, D/A change-over circuit, pin-saving chip, there is chip in PWM, drive circuit, optical coupling isolation circuit, single-chip microcomputer respectively with LCD, keyboard, pin-saving chip, D/A change-over circuit is connected, chip is there is respectively in D/A change-over circuit with PWM, drive circuit is connected, there is chip and be connected with optical coupling isolation circuit in PWM, optical coupling isolation circuit is connected with drive circuit, the external electromagnetically operated valve of drive circuit exports, keyboard is used for arranging system running state and system parameters, and LCD is used for running status, the controling parameters of display system, the external protective circuit of drive circuit, is used for protecting drive circuit, prevents the situation of overvoltage, overcurrent.
Optical coupling isolation circuit is used for pwm control signal and voltage amplitude amplifying signal to keep apart, the noise signal in elimination input circuit, the common land clutter signal in output loop; Optical coupling isolation circuit adopts photoisolator 6N137; Single-chip microcomputer adopts AT89C55 single-chip microcomputer; There is chip and adopt MAX038 chip and SG3525 chip in PWM; Pin-saving chip adopts AT24C02EEPROM chip.
The course of work of the present invention is as follows: first on LCD, set each parameter by keyboard and (comprise frequency, duty ratio, amplitude and transformation period), after pressing operation key, single-chip microcomputer reads in the parameter set, through controlling calculation, then check and use after convenient in the data information memory obtained to EEPROM, after completing, control signal is divided into two-way, one tunnel is responsible for the relevant information (mainly comprising the data message of frequency and duty ratio) of the PWM ripple of setting to give D/A, there is chip and send pwm pulse in the analog voltage control PWM exported after D/A conversion, the pwm signal produced is separated by through optical coupling isolation circuit and voltage amplitude control signal and is left, pwm control signal after isolation outputs to and drives in main circuit, another road amplitude control signal is directly provided through D/A by single-chip microcomputer, and main circuit is responsible for integrating two paths of signals, and through power amplification, the PWM square wave needed for final output is to electromagnetically operated valve.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (8)
1. the PWM power supply for vehicle electromagnetic valve performance test, it is characterized in that, comprise single-chip microcomputer, LCD, keyboard, D/A change-over circuit, pin-saving chip, there is chip in PWM, drive circuit, optical coupling isolation circuit, described single-chip microcomputer respectively with described LCD, described keyboard, described pin-saving chip, described D/A change-over circuit is connected, chip is there is respectively in described D/A change-over circuit with described PWM, described drive circuit is connected, there is chip and be connected with described optical coupling isolation circuit in described PWM, described optical coupling isolation circuit is connected with described drive circuit, the external electromagnetically operated valve of described drive circuit exports.
2. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 1, it is characterized in that, described keyboard is used for arranging system running state and system parameters, and described LCD is used for running status, the controling parameters of display system.
3. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 1, is characterized in that, the external protective circuit of described drive circuit, is used for protecting drive circuit, prevents the situation of overvoltage, overcurrent.
4. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 1, it is characterized in that, described optical coupling isolation circuit is used for pwm control signal and voltage amplitude amplifying signal to keep apart, the noise signal in elimination input circuit, the common land clutter signal in output loop.
5. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 4, is characterized in that, described optical coupling isolation circuit adopts photoisolator 6N137.
6. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 1, is characterized in that, described single-chip microcomputer adopts AT89C55 single-chip microcomputer.
7. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 1, is characterized in that, described PWM chip occurs and adopts MAX038 chip and SG3525 chip.
8. a kind of PWM power supply for vehicle electromagnetic valve performance test according to claim 1, is characterized in that, described pin-saving chip adopts AT24C02EEPROM chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510226769.XA CN104868889A (en) | 2015-05-07 | 2015-05-07 | Pulse-width modulation (PWM) power supply for performance test of automobile magnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510226769.XA CN104868889A (en) | 2015-05-07 | 2015-05-07 | Pulse-width modulation (PWM) power supply for performance test of automobile magnetic valve |
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| CN104868889A true CN104868889A (en) | 2015-08-26 |
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| CN201510226769.XA Pending CN104868889A (en) | 2015-05-07 | 2015-05-07 | Pulse-width modulation (PWM) power supply for performance test of automobile magnetic valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111045414A (en) * | 2019-11-28 | 2020-04-21 | 北汽福田汽车股份有限公司 | Control circuit and control device |
| CN111610813A (en) * | 2020-05-06 | 2020-09-01 | 湖南工程学院 | Constant-current driving circuit of electromagnetic valve for automobile |
| CN112113762A (en) * | 2020-09-22 | 2020-12-22 | 芜湖乐佳电器有限公司 | Intelligent closestool pulse valve testing method |
| CN113431947A (en) * | 2021-06-10 | 2021-09-24 | 西北机电工程研究所 | Energy-saving drive circuit of electromagnetic directional valve based on MOSFET |
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| CN101551410A (en) * | 2009-05-19 | 2009-10-07 | 武汉科技大学 | Electrical source for detecting electromagnetic valve quality of automobile |
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| JP2013115672A (en) * | 2011-11-30 | 2013-06-10 | Onkyo Corp | Pulse width modulation circuit and switching amplifier |
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2015
- 2015-05-07 CN CN201510226769.XA patent/CN104868889A/en active Pending
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| CN101551410A (en) * | 2009-05-19 | 2009-10-07 | 武汉科技大学 | Electrical source for detecting electromagnetic valve quality of automobile |
| JP2013115672A (en) * | 2011-11-30 | 2013-06-10 | Onkyo Corp | Pulse width modulation circuit and switching amplifier |
| CN103117662A (en) * | 2013-03-08 | 2013-05-22 | 滁州学院 | PWM (pulse width modulation) chopping NC (numerical control) AC (Alternating Current) power supply |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111045414A (en) * | 2019-11-28 | 2020-04-21 | 北汽福田汽车股份有限公司 | Control circuit and control device |
| CN111610813A (en) * | 2020-05-06 | 2020-09-01 | 湖南工程学院 | Constant-current driving circuit of electromagnetic valve for automobile |
| CN111610813B (en) * | 2020-05-06 | 2021-11-09 | 湖南工程学院 | Constant-current driving circuit of electromagnetic valve for automobile |
| CN112113762A (en) * | 2020-09-22 | 2020-12-22 | 芜湖乐佳电器有限公司 | Intelligent closestool pulse valve testing method |
| CN113431947A (en) * | 2021-06-10 | 2021-09-24 | 西北机电工程研究所 | Energy-saving drive circuit of electromagnetic directional valve based on MOSFET |
| CN113431947B (en) * | 2021-06-10 | 2023-08-04 | 西北机电工程研究所 | MOSFET-based energy-saving drive circuit for electromagnetic reversing valve |
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Application publication date: 20150826 |