CN103956901A - Buck circuit - Google Patents
Buck circuit Download PDFInfo
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- CN103956901A CN103956901A CN201410171808.6A CN201410171808A CN103956901A CN 103956901 A CN103956901 A CN 103956901A CN 201410171808 A CN201410171808 A CN 201410171808A CN 103956901 A CN103956901 A CN 103956901A
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- resistance
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- driver module
- chip microcomputer
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Abstract
The invention discloses an improved buck circuit and relates to the technical field of switching power supplies and controllers. The improved buck circuit comprises a master control circuit, a single-chip microcomputer and an MOS driving module, wherein the master control circuit comprises an inductor L3, a diode D1, an MOS tube Q2, an MOS tube Q3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a capacitor C3, a capacitor C4, an electrolytic capacitor EC3 and an electrolytic capacitor EC6. The improved buck circuit is simple, reliable and easy to implement. By means of the single-chip microcomputer, two PWM waveforms can be generated, a phase of one PWM waveform is 180 degree larger than that of the other PWM waveform, and the work frequency of a main circuit is increased by one time or more times. When applied to a buck power supply, the improved buck circuit has the advantages of increasing the work frequency of buck by two times, reducing capacity of input capacitors and output capacitors, decreasing inductance values and volumes and reducing volumes and cost of products within a certain range.
Description
Technical field
The present invention relates to Switching Power Supply and controller technology field, more specifically, relate to a kind of modified model buck(buck conversion) circuit.
Background technology
Along with social development, electronic product constantly updates, and power technology obtains unprecedented development especially, and switching speed is more and more faster, power is increasing, utilization scope is also more and more extensive, our air-conditioner controller for example, washing machine controller, refrigerator controller, controller for solar, led drive circuit etc. all needs to use power circuit, wherein mostly adopts buck circuit.In order to accomplish that intellectuality much all adopts Single-chip Controlling, yet the traditional single phase circuit of the many employings of present buck is subject to using the impact of components and parts and circuit framework, and traditional buck circuit exists following shortcoming:
1, common single-chip microcomputer pwm output frequency is low;
2, prime filter capacitor capacity is larger;
3, rear class filter capacitor capacity is larger;
4, the inductance value of energy storage inductor is large and volume is large;
The difficult choosing of inductance magnetic material when 5, high-power.
Comprehensive what time above, the very difficult miniaturization of product, the product cost greatly increasing.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention proposes a kind of buck circuit,
A buck circuit, comprises governor circuit, single-chip microcomputer and MOS driver module; Described governor circuit comprises inductance L 3, diode D1, mos pipe Q2-Q3, resistance R 1-R6, capacitor C 2-C4, electrochemical capacitor EC3, EC6;
Described diode D1 negative electrode with one end of inductance L 3, one end of one end of capacitor C 2, capacitor C 3, one end of one end of resistance R 2, resistance R 5, mos pipe Q2 source electrode, mos pipe Q3 source electrode and MOS driver module be connected; One end of the other end connecting resistance R1 of capacitor C 2, another termination mos pipe grid of Q2 and one end of resistance R 3 of resistance R 2; One end of the other end connecting resistance R3 of capacitor C 3, another termination mos pipe grid of Q3 and one end of resistance R 6 of resistance R 5; Another termination MOS driver module of the other end of resistance R 3 and resistance R 6;
The positive pole of electrochemical capacitor EC3 with the other end of resistance R 1, the Q2 drain electrode of the other end of resistance R 4, mos pipe and mos pipe Q3 drain electrode be connected;
The positive pole of electrochemical capacitor EC6 is connected with one end of capacitor C 4 and the other end of inductance L 3, and as the output of governor circuit; The other end ground connection of the negative pole of the anode of the negative pole of electrochemical capacitor EC3 and diode D1, electrochemical capacitor EC6 and capacitor C 4;
Described single-chip microcomputer is connected with MOS driver module.
Described mos pipe Q2 and mos pipe Q3 are N-type mos pipe.
Described single-chip microcomputer is the single-chip microcomputer that can produce the two-way PWM waveform of phase phasic difference 180 degree.
The negative electrode of described diode D1 connects 2 pin and 4 pin of MOS driver module; The other end of 1 pin connecting resistance R3 of MOS driver module, the other end of 3 pin connecting resistance R6 of MOS driver module, 3 pin of single-chip microcomputer are connected with MOS driver module 6 pin; 5 pin of single-chip microcomputer are connected with MOS driver module 5 pin.
Compared with prior art, beneficial effect of the present invention is: provide a kind of simple and reliable, the buck circuit of easily realizing, utilizes single-chip microcomputer to produce the pwm waveform of two-way phase phasic difference 180 degree, and the operating frequency of main circuit is improved to 1 times or many times.
The present invention applies in Buck power supply, has following useful effect:
1. improve the operating frequency of buck twice.
2. reduced the capacity of input capacitance.
3. reduced the capacity of output capacitance.
4. inductance value and inductance volume have been reduced.
5. volume and the cost of product in certain limit, have been reduced.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of buck circuit of invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but embodiments of the present invention are not limited to this.
Embodiment:
Modified model buck circuit is as a Fig. 1, governor circuit, single-chip microcomputer and MOS driver module; Described governor circuit comprises inductance L 3, diode D1, mos pipe Q2-Q3, resistance R 1-R6, capacitor C 2-C4, electrochemical capacitor EC3, EC6;
Described diode D1 negative electrode with one end of inductance L 3, one end of one end of capacitor C 2, capacitor C 3, one end of one end of resistance R 2, resistance R 5, mos pipe Q2 source electrode, mos pipe Q3 source electrode and MOS driver module are connected, above-mentioned diode D1 negative electrode connects 2 pin and 4 pin of MOS driver module; One end of the other end connecting resistance R1 of capacitor C 2, another termination mos pipe grid of Q2 and one end of resistance R 3 of resistance R 2; One end of the other end connecting resistance R3 of capacitor C 3, another termination mos pipe grid of Q3 and one end of resistance R 6 of resistance R 5; 1 pin of another termination MOS driver module of resistance R 3,3 pin of another termination MOS driver module of resistance R 6;
The positive pole of electrochemical capacitor EC3 with the other end of resistance R 1, the Q2 drain electrode of the other end of resistance R 4, mos pipe and mos pipe Q3 drain electrode be connected;
The positive pole of electrochemical capacitor EC6 is connected with one end of capacitor C 4 and the other end of inductance L 3, and as the output of governor circuit; The other end ground connection of the negative pole of the anode of the negative pole of electrochemical capacitor EC3 and diode D1, electrochemical capacitor EC6 and capacitor C 4;
Described single-chip microcomputer is connected with MOS driver module, and wherein 3 pin of single-chip microcomputer are connected with MOS driver module 6 pin; 5 pin of single-chip microcomputer are connected with MOS driver module 5 pin.。
In the present embodiment, described mos pipe Q2 and mos pipe Q3 are N-type mos pipe.Its single-chip microcomputer is the single-chip microcomputer that can produce the two-way PWM waveform of phase phasic difference 180 degree.
A kind of modified model buck circuit that the present invention proposes, its operation principle 1 is: the two-way 180 degree pwm signals that single-chip microcomputer produces two-way are superimposed by optocoupler driver module, thus the pwm signal of output doubled frequency.
Its operation principle 2 is: because frequency has improved twice, and input capacitance, output capacitance, and inductance is by corresponding reducing.
By above principle, can solve traditional buck circuit work frequency low, the shortcoming that electric capacity is large, inductance is large.And electric circuit characteristic is: simple and reliable, easily realize.
Other embodiments of the present invention are: described circuit not only comprises the inductance of same function, and the mos pipe of same function, also comprises that other have the electronic devices and components of same function and function.
The above; only for the present invention is compared with specific embodiment; but the protection range of invention does not limit to therewith; anyly be familiar with those skilled in the art in the scope that the present invention discloses; according to technical scheme of the present invention and inventive concept, be equal to replacement or changed, all being belonged to protection scope of the present invention.
Claims (4)
1. a buck circuit, is characterized in that, comprises governor circuit, single-chip microcomputer and MOS driver module; Described governor circuit comprises inductance L 3, diode D1, mos pipe Q2-Q3, resistance R 1-R6, capacitor C 2-C4, electrochemical capacitor EC3, EC6;
Described diode D1 negative electrode with one end of inductance L 3, one end of one end of capacitor C 2, capacitor C 3, one end of one end of resistance R 2, resistance R 5, mos pipe Q2 source electrode, mos pipe Q3 source electrode and MOS driver module be connected; One end of the other end connecting resistance R1 of capacitor C 2, another termination mos pipe grid of Q2 and one end of resistance R 3 of resistance R 2; One end of the other end connecting resistance R3 of capacitor C 3, another termination mos pipe grid of Q3 and one end of resistance R 6 of resistance R 5; Another termination MOS driver module of the other end of resistance R 3 and resistance R 6;
The positive pole of electrochemical capacitor EC3 with the other end of resistance R 1, the Q2 drain electrode of the other end of resistance R 4, mos pipe and mos pipe Q3 drain electrode be connected;
The positive pole of electrochemical capacitor EC6 is connected with one end of capacitor C 4 and the other end of inductance L 3, and as the output of governor circuit; The other end ground connection of the negative pole of the anode of the negative pole of electrochemical capacitor EC3 and diode D1, electrochemical capacitor EC6 and capacitor C 4;
Described single-chip microcomputer is connected with MOS driver module.
2. buck circuit according to claim 1, is characterized in that, described mos pipe Q2 and mos pipe Q3 are N-type mos pipe.
3. buck circuit according to claim 2, is characterized in that, described single-chip microcomputer is the single-chip microcomputer that can produce the two-way PWM waveform of phase phasic difference 180 degree.
4. buck circuit according to claim 1 and 2, is characterized in that, the negative electrode of described diode D1 connects 2 pin and 4 pin of MOS driver module; The other end of 1 pin connecting resistance R3 of MOS driver module, the other end of 3 pin connecting resistance R6 of MOS driver module, 3 pin of single-chip microcomputer are connected with MOS driver module 6 pin; 5 pin of single-chip microcomputer are connected with MOS driver module 5 pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410171808.6A CN103956901A (en) | 2014-04-25 | 2014-04-25 | Buck circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410171808.6A CN103956901A (en) | 2014-04-25 | 2014-04-25 | Buck circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103956901A true CN103956901A (en) | 2014-07-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410171808.6A Pending CN103956901A (en) | 2014-04-25 | 2014-04-25 | Buck circuit |
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| Country | Link |
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| CN (1) | CN103956901A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578086A (en) * | 2003-07-10 | 2005-02-09 | 精工电子有限公司 | Switching regulator control circuit |
| CN1967991A (en) * | 2005-11-14 | 2007-05-23 | 广达电脑股份有限公司 | DC-DC convertor |
| CN102664523A (en) * | 2012-05-28 | 2012-09-12 | 深圳华意隆电气股份有限公司 | Storage battery energy-storing chopping-type welding-cutting power source |
| US20130063119A1 (en) * | 2011-09-12 | 2013-03-14 | Solaredge Technologies Ltd. | Direct current link circuit |
| CN203883675U (en) * | 2014-04-25 | 2014-10-15 | 广东瑞德智能科技股份有限公司 | Buck circuit |
-
2014
- 2014-04-25 CN CN201410171808.6A patent/CN103956901A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1578086A (en) * | 2003-07-10 | 2005-02-09 | 精工电子有限公司 | Switching regulator control circuit |
| CN1967991A (en) * | 2005-11-14 | 2007-05-23 | 广达电脑股份有限公司 | DC-DC convertor |
| US20130063119A1 (en) * | 2011-09-12 | 2013-03-14 | Solaredge Technologies Ltd. | Direct current link circuit |
| CN102664523A (en) * | 2012-05-28 | 2012-09-12 | 深圳华意隆电气股份有限公司 | Storage battery energy-storing chopping-type welding-cutting power source |
| CN203883675U (en) * | 2014-04-25 | 2014-10-15 | 广东瑞德智能科技股份有限公司 | Buck circuit |
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Application publication date: 20140730 |