CN204349796U - A kind of BUCK circuit - Google Patents
A kind of BUCK circuit Download PDFInfo
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- CN204349796U CN204349796U CN201520003229.0U CN201520003229U CN204349796U CN 204349796 U CN204349796 U CN 204349796U CN 201520003229 U CN201520003229 U CN 201520003229U CN 204349796 U CN204349796 U CN 204349796U
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Abstract
The utility model discloses a kind of BUCK circuit.Comprise solar panel and storage battery, also comprise between solar panel with storage battery: an input filter unit, a main control unit, a synchronous rectification unit, one drive circuit unit, an output filtering unit, a current sampling unit, a backflow protection unit and an over-current protecting unit.BUCK circuit of the present utility model also comprises the lower brachium pontis that synchronous rectification is done in Q2 and Q3 parallel connection, plays the effect of beginning fast, effectively can improve the drive characteristic of synchronous BUCK, reduces EMI interference.
Description
Technical field
The utility model relates to field of solar energy conversion, particularly relates to a kind of BUCK circuit.
Background technology
The amount of radiation that earth surface accepts the sun every year reaches 5.4 × 10
24j, item is worked as in 1.8 × 10
14t standard coal.If 0.1% is wherein converted to electric energy by transfer ratio 5%, every annual energy output can reach 5 600TWh, and item is worked as in 40 times of current whole world energy consumption.Therefore, solar power generation has the meaning of particular importance to energy development from now on.At present, solar power generation mainly refers to photovoltaic generation.
Due to the special power stage curve of photovoltaic battery panel, algorithm conventional at present has:
1. constant voltage method is a kind of MPPT(maximum power point tracking the earliest) control method, under different illumination intensity, the voltage of the MPP (peak power output point) of photovoltaic battery array is similar to item etc.Utilize this characteristic, photovoltaic cell output voltage is fixed on this voltage, realize the maximum power output of photovoltaic cell.The method cannot realize MPPT more exactly and control.
2. disturbance observation, i.e. climbing method, be a kind of practical MPPT control algolithm, this algorithm has increased the weight of the burden of CPU to a certain extent, and due to periodicity optimizing, can cause periodic fluctuation to the output voltage of system.
3. conductance increment method follows the tracks of MPP one of algorithm fast and accurately at present, but its shortcoming is: very high to the requirement of hardware, particularly require the digitlization conversion of analog signal accurately and fast, and high-quality filtering process must be done to signal, otherwise the function finding MPP cannot be realized.In addition also have and equally take CPU time too many shortcoming with disturbance observation.
These technology are all generally regulate using voltage as with reference to value, and above algorithm is when occurring shade or blocking at solar panel, the dual waves of appearance or many crests have no idea to cross completely, therefore exist a lot of not enough in application.
Utility model content
The utility model proposes a kind of BUCK circuit for deficiency of the prior art.
The technical solution of the utility model is as follows:
A kind of BUCK circuit, comprises solar panel and storage battery, it is characterized in that: also comprise between solar panel and storage battery:
One input filter unit: be made up of electric capacity C1;
One main control unit: mainly for generation of control signal;
One synchronous rectification unit: be made up of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and Schottky diode D1;
One drive circuit unit: for driving synchronous rectification unit, and export three PWM;
One output filtering unit: be made up of, for storage power inductance L 1 and electric capacity C2;
One current sampling unit: be made up of resistance R1,
One backflow protection unit: be made up of R1 and DSP,
One over-current protecting unit: be made up of R1 and DSP.
Further, also comprise for anti-reverse connection of accumulator metal-oxide-semiconductor Q4.
Further, also comprise metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3, Q2 and the Q3 lower brachium pontis doing synchronous rectification in parallel, play the effect of beginning fast, effectively can improve the drive characteristic of synchronous BUCK, reduce EMI interference.
The beneficial effects of the utility model: comprise the lower brachium pontis that synchronous rectification is done in Q2 and Q3 parallel connection, play the effect of beginning fast, effectively can improve the drive characteristic of synchronous BUCK, reduce EMI interference.
Accompanying drawing explanation
Fig. 1 is the utility model BUCK circuit diagram.
Embodiment
In order to better the utility model is described, existing in conjunction with the embodiments and accompanying drawing be further described.
Embodiment 1:BUCK circuit
A kind of BUCK circuit, comprises solar panel and storage battery, it is characterized in that: also comprise between solar panel and storage battery: an input filter unit: be made up of electric capacity C1; One main control unit: mainly for generation of control signal; One synchronous rectification unit: be made up of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and Schottky diode D1; One drive circuit unit: for driving synchronous rectification unit, and export three PWM; One output filtering unit: be made up of, for storage power inductance L 1 and electric capacity C2; One current sampling unit: be made up of resistance R1, a backflow protection unit: be made up of R1 and DSP, an over-current protecting unit: be made up of R1 and DSP.
Further, also comprise for anti-reverse connection of accumulator metal-oxide-semiconductor Q4;
Further, also comprise metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3, Q2 and the Q3 lower brachium pontis doing synchronous rectification in parallel, play the effect of beginning fast, effectively can improve the drive characteristic of synchronous BUCK, reduce EMI interference.
Claims (3)
1. a BUCK circuit, comprises solar panel and storage battery, it is characterized in that: also comprise between solar panel and storage battery:
One input filter unit: be made up of electric capacity C1;
One main control unit: mainly for generation of control signal;
One synchronous rectification unit: be made up of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and Schottky diode D1;
One drive circuit unit: for driving synchronous rectification unit, and export three PWM;
One output filtering unit: be made up of, for storage power inductance L 1 and electric capacity C2;
One current sampling unit: be made up of resistance R1,
One backflow protection unit: be made up of R1 and DSP,
One over-current protecting unit: be made up of R1 and DSP.
2. BUCK circuit according to claim 1, is characterized in that: also comprise for anti-reverse connection of accumulator metal-oxide-semiconductor Q4.
3. BUCK circuit according to claim 1, is characterized in that: also comprise the lower brachium pontis that synchronous rectification is done in metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3, Q2 and Q3 parallel connection, play the effect of beginning fast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520003229.0U CN204349796U (en) | 2015-01-05 | 2015-01-05 | A kind of BUCK circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520003229.0U CN204349796U (en) | 2015-01-05 | 2015-01-05 | A kind of BUCK circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349796U true CN204349796U (en) | 2015-05-20 |
Family
ID=53233035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520003229.0U Expired - Fee Related CN204349796U (en) | 2015-01-05 | 2015-01-05 | A kind of BUCK circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349796U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578775A (en) * | 2015-01-05 | 2015-04-29 | 深圳硕日新能源科技有限公司 | BUCK circuit and maximum power point tracking method based on same |
-
2015
- 2015-01-05 CN CN201520003229.0U patent/CN204349796U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578775A (en) * | 2015-01-05 | 2015-04-29 | 深圳硕日新能源科技有限公司 | BUCK circuit and maximum power point tracking method based on same |
| CN104578775B (en) * | 2015-01-05 | 2017-11-10 | 深圳硕日新能源科技有限公司 | A kind of method of BUCK circuits and the maximum power point tracking based on BUCK circuits |
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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 |
Granted publication date: 20150520 Termination date: 20160105 |