CN106411169A - High-frequency inversion circuit based on digital-to-analog conversion - Google Patents
High-frequency inversion circuit based on digital-to-analog conversion Download PDFInfo
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- CN106411169A CN106411169A CN201510460316.3A CN201510460316A CN106411169A CN 106411169 A CN106411169 A CN 106411169A CN 201510460316 A CN201510460316 A CN 201510460316A CN 106411169 A CN106411169 A CN 106411169A
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Abstract
The invention relates to a high-frequency inversion circuit based on digital-to-analog conversion. The circuit comprises a microprocessor with a digital-to-analog conversion function, the microprocessor with the digital-to-analog conversion function is connected with a voltage following circuit, a PWM pulse generation and driving circuit, and a high-frequency transformer in sequence, the microprocessor with the digital-to-analog conversion function is also connected with a voltage sampling circuit, and the voltage sampling circuit is connected with an input direct current power supply. According to the circuit, processed signals are acquired by employing the microprocessor, a specific analog voltage is generated through a D/A (digital-to-analog circuit) in a chip in order to control a switch chip for generating PWM pulses, the duty ratio of the PWM pulses is adjusted, the condition of magnetic saturation of the high-frequency transformer is controlled, and the no-load current of the high-frequency inverter is reduced.
Description
Technical field
The present invention relates to a kind of high-frequency inverter circuit based on digital-to-analogue conversion.
Background technology
In high-frequency inversion scheme, there are open loop mode and closed loop mode.In closed loop mode, by becoming to high frequency
Output DC voltage after changing samples, feeds back in the PWM control of primary, dynamically adjusts pwm pulse.This
Scheme can reduce the no-load current of input direct-current, reduces open circuit loss.But the disadvantage of this scheme is band
Convert less efficient during load, typically maximum conversion efficiency is 80% about.
In open loop mode, current general scheme is the dead band producing fixing PWM drive cycle, not to change
Output voltage sampling after changing.This scheme can produce compared with high conversion efficiency, and normal conversion efficiency is in 92-95%.
But the shortcoming of this scheme is that no-load current drastically raises in the case that input direct voltage is higher, unloaded damage
Consumption increases.And, under High Level DC Voltage input condition, impact heavy load, high frequency transformer is particularly easy to
Saturation, and then burn the power tube in DC converting loop
How on the premise of ensureing high conversion efficiency, reduce the open circuit loss of high-frequency inversion, it is to avoid transformer
Magnetic saturation, is the difficult problem that all producers all suffer from present.
Content of the invention
The technical problem to be solved in the present invention is：For overcoming the problems referred to above, provide a kind of based on digital-to-analogue conversion
High-frequency inverter circuit.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of high-frequency inverter circuit based on digital-to-analogue conversion, including the microprocessor with analog conversion function,
The described microprocessor with analog conversion function is connected with voltage follower circuit in turn, pwm pulse produces and drives
Dynamic circuit, high frequency transformer, the described microprocessor with analog conversion function is also associated with voltage sample electricity
Road, described voltage sampling circuit is connected with input DC power.
Preferably, the described microprocessor with analog conversion function can be replaced D/A converting circuit and monolithic
Machine.
Preferably, described voltage sampling circuit includes resistance R2, resistance R3 and electric capacity C1.
Preferably, described voltage follower circuit includes electric capacity C2 and operational amplifier U3.
Preferably, described pwm pulse produce and drive circuit include SPWM control chip U2, resistance R4,
Resistance R1, resistance R5, electric capacity C3, insulated gate bipolar transistor Q1, insulated gate bipolar transistor Q2.
The invention has the beneficial effects as follows：The present invention utilizes the signal after microprocessor acquisition process, by chip
Internal D/A (D/A converting circuit) produces specific analog voltage, goes to control opening of generation pwm pulse
Close chip, thus adjusting the dutycycle of pwm pulse, controlling the magnetic saturation situation of high frequency transformer, reducing
The no-load current of high-frequency inverter.
Brief description
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structured flowchart of one embodiment of the invention；
Fig. 2 is the circuit diagram of one embodiment of the invention.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification,
The basic structure of the present invention is only described in a schematic way, therefore it only shows the composition relevant with the present invention.
Embodiment 1
Of the present invention a kind of high-frequency inverter circuit based on digital-to-analogue conversion as shown in Figure 1, including having number
The microprocessor of mould translation function, its according to input d. c. voltage signal, by internal logical algorithm,
Calculate certain numerical value, then pass through internal D/A converting circuit (D/A), produce certain simulation
Amount, preferably can adopt 51 series monolithics in a specific embodiment, or other are integrated with analog-to-digital conversion
The single-chip microcomputer of function, the described microprocessor with analog conversion function be connected with turn voltage follower circuit,
Pwm pulse produces and drive circuit, high frequency transformer, and the described microprocessor with analog conversion function also connects
It is connected to voltage sampling circuit, described voltage sampling circuit is connected with input DC power.
The analog voltage that described voltage follower circuit is used for producing microprocessor unit carries out power amplification,
For driving late-class circuit；
Described pwm pulse produces and drive circuit, according to the analog voltage of voltage follower output, to adjust
The dead band value that whole output arteries and veins fills；
Pwm pulse is produced described high frequency transformer and drive circuit carries out voltage high frequency conversion process, conversion
One-tenth system required voltage value, this new D/A (D/A converting circuit) by chip internal produces specific
Analog voltage, go control produce pwm pulse switch chip, thus adjusting the dutycycle of pwm pulse,
Control the magnetic saturation situation of high frequency transformer, reduce the no-load current of high-frequency inverter.
In a preferred embodiment, the described microprocessor with analog conversion function can be replaced digital-to-analogue and turns
Change circuit and single-chip microcomputer, that is, with the single-chip microcomputer of not integrated analog conversion function and single D/A change-over circuit Lai
Replace.
In a preferred embodiment, as shown in Fig. 2 described voltage sampling circuit includes resistance R2, resistance
R3 and electric capacity C1.
In a preferred embodiment, described voltage follower circuit includes electric capacity C2 and operational amplifier U3.
In a preferred embodiment, described pwm pulse produce and drive circuit include SPWM control chip U2,
Resistance R4, resistance R1, resistance R5, electric capacity C3, insulated gate bipolar transistor Q1, insulated gate bipolar
Transistor Q2.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, related work
Personnel can carry out various change and modification completely in the range of without departing from this invention technological thought.
The technical scope of this invention is not limited to content on specification it is necessary to according to right
To determine its technical scope.
Claims (5)
1. a kind of high-frequency inverter circuit based on digital-to-analogue conversion is it is characterised in that include thering is digital-to-analogue conversion work(
Can microprocessor, the described microprocessor with analog conversion function be connected with turn voltage follower circuit,
Pwm pulse produces and drive circuit, high frequency transformer, and the described microprocessor with analog conversion function also connects
It is connected to voltage sampling circuit, described voltage sampling circuit is connected with input DC power.
2. the high-frequency inverter circuit based on digital-to-analogue conversion as claimed in claim 1 is it is characterised in that described
The microprocessor with analog conversion function can be replaced D/A converting circuit and single-chip microcomputer.
3. the high-frequency inverter circuit based on digital-to-analogue conversion as claimed in claim 1 is it is characterised in that described
Voltage sampling circuit includes resistance R2, resistance R3 and electric capacity C1.
4. the high-frequency inverter circuit based on digital-to-analogue conversion as claimed in claim 1 is it is characterised in that described
Voltage follower circuit includes electric capacity C2 and operational amplifier U3.
5. the high-frequency inverter circuit based on digital-to-analogue conversion as claimed in claim 1 is it is characterised in that described
Pwm pulse produce and drive circuit include SPWM control chip U2, resistance R4, resistance R1, resistance R5,
Electric capacity C3, insulated gate bipolar transistor Q1, insulated gate bipolar transistor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460316.3A CN106411169A (en) | 2015-07-30 | 2015-07-30 | High-frequency inversion circuit based on digital-to-analog conversion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460316.3A CN106411169A (en) | 2015-07-30 | 2015-07-30 | High-frequency inversion circuit based on digital-to-analog conversion |
Publications (1)
| Publication Number | Publication Date |
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| CN106411169A true CN106411169A (en) | 2017-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510460316.3A Pending CN106411169A (en) | 2015-07-30 | 2015-07-30 | High-frequency inversion circuit based on digital-to-analog conversion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217693A (en) * | 2017-06-30 | 2019-01-15 | 江苏国瑞科技有限公司 | High-field electrode foil laboratory power source special |
| CN113271004A (en) * | 2021-05-21 | 2021-08-17 | 中国人民解放军战略支援部队航天工程大学 | Adjustable boost power supply of high accuracy software |
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| US5510974A (en) * | 1993-12-28 | 1996-04-23 | Philips Electronics North America Corporation | High frequency push-pull converter with input power factor correction |
| CN101986545A (en) * | 2010-05-13 | 2011-03-16 | 江苏大学 | Inverter driving device based on digital signal processor (DSP) and complex programmable logic device (CPLD) |
| CN102281011A (en) * | 2011-08-30 | 2011-12-14 | 江苏物联网研究发展中心 | Single-phase inversion frequency conversion power supply based on sine modulation wave |
| CN102299683A (en) * | 2011-08-30 | 2011-12-28 | 江苏物联网研究发展中心 | Unipolar sinusoidal modulation wave generating circuit |
| CN103683967A (en) * | 2013-12-10 | 2014-03-26 | 华南农业大学 | Macro-micro driving power supply of linear driver and control method thereof |
| CN203982188U (en) * | 2014-08-14 | 2014-12-03 | 南京国电南自城乡电网自动化工程有限公司 | Circuit control device pick-up unit |
| CN204928609U (en) * | 2015-07-30 | 2015-12-30 | 苏州大禾能源技术有限公司 | High frequency inverter circuit based on digital analog conversion |
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2015
- 2015-07-30 CN CN201510460316.3A patent/CN106411169A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| US5510974A (en) * | 1993-12-28 | 1996-04-23 | Philips Electronics North America Corporation | High frequency push-pull converter with input power factor correction |
| CN101986545A (en) * | 2010-05-13 | 2011-03-16 | 江苏大学 | Inverter driving device based on digital signal processor (DSP) and complex programmable logic device (CPLD) |
| CN102281011A (en) * | 2011-08-30 | 2011-12-14 | 江苏物联网研究发展中心 | Single-phase inversion frequency conversion power supply based on sine modulation wave |
| CN102299683A (en) * | 2011-08-30 | 2011-12-28 | 江苏物联网研究发展中心 | Unipolar sinusoidal modulation wave generating circuit |
| CN103683967A (en) * | 2013-12-10 | 2014-03-26 | 华南农业大学 | Macro-micro driving power supply of linear driver and control method thereof |
| CN203982188U (en) * | 2014-08-14 | 2014-12-03 | 南京国电南自城乡电网自动化工程有限公司 | Circuit control device pick-up unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217693A (en) * | 2017-06-30 | 2019-01-15 | 江苏国瑞科技有限公司 | High-field electrode foil laboratory power source special |
| CN113271004A (en) * | 2021-05-21 | 2021-08-17 | 中国人民解放军战略支援部队航天工程大学 | Adjustable boost power supply of high accuracy software |
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Application publication date: 20170215 |