CN204928609U - High frequency inverter circuit based on digital analog conversion - Google Patents
High frequency inverter circuit based on digital analog conversion Download PDFInfo
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- CN204928609U CN204928609U CN201520565831.3U CN201520565831U CN204928609U CN 204928609 U CN204928609 U CN 204928609U CN 201520565831 U CN201520565831 U CN 201520565831U CN 204928609 U CN204928609 U CN 204928609U
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- analog conversion
- microprocessor
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- frequency inverter
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Abstract
The utility model relates to a high frequency inverter circuit based on digital analog conversion, including the microprocessor who has the digital analog conversion function, the microprocessor who has the digital analog conversion function has connected gradually voltage follower circuit, PWM pulse generation and drive circuit, high -frequency transformer, the microprocessor who has the digital analog conversion function still is connected with voltage sampling circuit, voltage sampling circuit and input DC power supply are connected, the utility model discloses signal after utilizing microprocessor gather to handle, the DA ( digital analog conversion circuit) through chip produces specific analog voltage, goes control to produce the switcher chip of PWM pulse to the duty cycle of adjustment PWM pulse, control high -frequency transformer's the magnetic saturation condition has reduced the no -load current of high frequency dc -to -ac converter.
Description
Technical field
The utility model 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 sampling the output dc voltage after high frequency conversion, feeding back in elementary PWM control, dynamic conditioning pwm pulse.This scheme can reduce the no-load current of input direct-current, reduces no-load loss.But conversion efficiency is lower when the disadvantage of this scheme is bringing onto load, general maximum conversion efficiency is about 80%.
In open loop mode, current general scheme is the dead band producing fixing PWM drive cycle, not to the output voltage sampling after conversion.This scheme can produce comparatively high conversion efficiency, and normal conversion efficiency is at 92-95%.But the shortcoming of this scheme is that no-load current sharply raises when input direct voltage is higher, no-load loss increases.Further, under High Level DC Voltage input condition, impact heavy load, high frequency transformer is especially easily saturated, and then burns the power tube in DC converting loop
How under the prerequisite ensureing high conversion efficiency, reduce the no-load loss of high-frequency inversion, avoiding transformer magnetic saturation, is the difficult problem that current all producers all face.
Utility model content
The technical problems to be solved in the utility model is: for overcoming the problems referred to above, provides a kind of high-frequency inverter circuit based on digital-to-analogue conversion.
The utility model solves the technical scheme that its technical problem adopts:
A kind of high-frequency inverter circuit based on digital-to-analogue conversion, comprise 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 drive circuit, high frequency transformer, the described microprocessor with analog conversion function is also connected with voltage sampling circuit, and described voltage sampling circuit is connected with input DC power.
Preferably, the microprocessor described in analog conversion function can be replaced D/A converting circuit and single-chip microcomputer.
Preferably, described voltage sampling circuit comprises resistance R2, resistance R3 and electric capacity C1.
Preferably, described voltage follower circuit comprises electric capacity C2 and operational amplifier U3.
Preferably, described pwm pulse generation and drive circuit comprise SPWM control chip U2, resistance R4, resistance R1, resistance R5, electric capacity C3, insulated gate bipolar transistor Q1, insulated gate bipolar transistor Q2.
The beneficial effects of the utility model are: the utility model utilizes the signal after microcontroller acquires process, specific analog voltage is produced by the D/A (D/A converting circuit) of chip internal, remove the switch chip controlling to produce pwm pulse, thus the duty ratio of adjustment pwm pulse, control the magnetic saturation situation of high frequency transformer, reduce the no-load current of high-frequency inverter.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the structured flowchart of the utility model embodiment;
Fig. 2 is the circuit diagram of the utility model embodiment.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
Embodiment 1
Described in the utility model a kind of high-frequency inverter circuit based on digital-to-analogue conversion as shown in Figure 1, comprise the microprocessor with analog conversion function, it is according to the d. c. voltage signal of input, by the logical algorithm of inside, calculate certain numerical value, then by inner D/A converting circuit (D/A), produce certain analog quantity, preferably can adopt 51 series monolithics in a specific embodiment, or other are integrated with the single-chip microcomputer of analog-digital conversion function, the described microprocessor with analog conversion function is connected with voltage follower circuit in turn, pwm pulse produces and drive circuit, high frequency transformer, the described microprocessor with analog conversion function is also connected with voltage sampling circuit, described voltage sampling circuit is connected with input DC power.
Described voltage follower circuit is used for the analog voltage that microprocessor unit produces to carry out power amplification, for driving late-class circuit;
Described pwm pulse produces and drive circuit, according to the analog voltage that voltage follower exports, adjusts the dead band value exporting arteries and veins and fill;
Described high frequency transformer produces pwm pulse and drive circuit carries out voltage high frequency conversion process, be transformed into system required voltage value, this novel D/A by chip internal (D/A converting circuit) produces specific analog voltage, remove the switch chip controlling to produce pwm pulse, thus the duty ratio of adjustment pwm pulse, control the magnetic saturation situation of high frequency transformer, reduce the no-load current of high-frequency inverter.
In a preferred embodiment, described in there is analog conversion function microprocessor can be replaced D/A converting circuit and single-chip microcomputer, namely replace with the single-chip microcomputer of not integrated analog conversion function and independent D/A change-over circuit.
In a preferred embodiment, as shown in Figure 2, described voltage sampling circuit comprises resistance R2, resistance R3 and electric capacity C1.
In a preferred embodiment, described voltage follower circuit comprises electric capacity C2 and operational amplifier U3.
In a preferred embodiment, described pwm pulse generation and drive circuit comprise SPWM control chip U2, resistance R4, resistance R1, resistance R5, electric capacity C3, insulated gate bipolar transistor Q1, insulated gate bipolar transistor Q2.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.
Claims (5)
1. the high-frequency inverter circuit based on digital-to-analogue conversion, it is characterized in that, comprise 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 drive circuit, high frequency transformer, the described microprocessor with analog conversion function is also connected with voltage sampling circuit, and described voltage sampling circuit is connected with input DC power.
2., as claimed in claim 1 based on the high-frequency inverter circuit of digital-to-analogue conversion, it is characterized in that, described in there is analog conversion function microprocessor can be replaced D/A converting circuit and single-chip microcomputer.
3., as claimed in claim 1 based on the high-frequency inverter circuit of digital-to-analogue conversion, it is characterized in that, described voltage sampling circuit comprises resistance R2, resistance R3 and electric capacity C1.
4., as claimed in claim 1 based on the high-frequency inverter circuit of digital-to-analogue conversion, it is characterized in that, described voltage follower circuit comprises electric capacity C2 and operational amplifier U3.
5. as claimed in claim 1 based on the high-frequency inverter circuit of digital-to-analogue conversion, it is characterized in that, described pwm pulse produces and drive circuit comprises 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 |
|---|---|---|---|
| CN201520565831.3U CN204928609U (en) | 2015-07-30 | 2015-07-30 | High frequency inverter circuit based on digital analog conversion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520565831.3U CN204928609U (en) | 2015-07-30 | 2015-07-30 | High frequency inverter circuit based on digital analog conversion |
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| Publication Number | Publication Date |
|---|---|
| CN204928609U true CN204928609U (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520565831.3U Expired - Fee Related CN204928609U (en) | 2015-07-30 | 2015-07-30 | High frequency inverter circuit based on digital analog conversion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411169A (en) * | 2015-07-30 | 2017-02-15 | 苏州大禾能源技术有限公司 | High-frequency inversion circuit based on digital-to-analog conversion |
-
2015
- 2015-07-30 CN CN201520565831.3U patent/CN204928609U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411169A (en) * | 2015-07-30 | 2017-02-15 | 苏州大禾能源技术有限公司 | High-frequency inversion circuit based on digital-to-analog conversion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20210730 |