CN100536302C - BUCK driving circuit - Google Patents
BUCK driving circuit Download PDFInfo
- Publication number
- CN100536302C CN100536302C CNB2006100645473A CN200610064547A CN100536302C CN 100536302 C CN100536302 C CN 100536302C CN B2006100645473 A CNB2006100645473 A CN B2006100645473A CN 200610064547 A CN200610064547 A CN 200610064547A CN 100536302 C CN100536302 C CN 100536302C
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- driving tube
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Abstract
This invention discloses one BUCK drive circuit, which comprises the following parts: commuter tube to output switch power voltage from input end to voltage output end; commuter charge circuit to charge the commuter tube in control of PWM switch signals to make the BUCK drive circuit in commuter work status; the commuter discharge circuit is to make the drive circuit at back flow work status in discharge in control of PWM switch signals.
Description
[technical field]
The present invention relates to a kind of drive circuit, relate in particular to a kind of BUCK drive circuit of practicality.
[background technology]
Along with the development in power supply market, increasing to the demand of Switching Power Supply, in various Switching Power Supplies, adopt BUCK, BOOST circuit to design usually for the power supply of non-isolation type.Wherein, the BUCK circuit refers to buck circuit, and the BOOST circuit refers to boost chopper.And in the design of BUCK circuit topology, the driving of rectifying tube is a design difficulty.Rectifying tube drives forms such as mainly containing isolation drive and bootstrapping driving, and existing a lot of integrated chips in bootstrapping drives be divided into two kinds of low pressure and high pressure, but most of price are higher.
[summary of the invention]
The present invention is exactly in order to overcome above deficiency, to have proposed a kind of cheap practical BUCK drive circuit.
For achieving the above object, BUCK drive circuit of the present invention, rectifying tube is included in the BUCK circuit, be used for the voltage of Switching Power Supply is outputed to voltage output end by the voltage input end rectification, comprise: the rectifying tube charging circuit, being used for when PWM opens signal controlling described rectifying tube charged makes described BUCK circuit be in the rectification operating state; The rectifying tube discharge circuit, being used for when the PWM cut-off signals is controlled described rectifying tube discharged makes described BUCK circuit be in the afterflow operating state.
Wherein, described rectifying tube charging circuit comprises first driving tube and second driving tube; The described first driving tube base stage is electrically connected grounded emitter with pwm signal; The described second driving tube base stage is electrically connected with the described first driving tube collector electrode, and collector electrode is electrically connected with the gate pole of described rectifying tube through the 3rd diode, and emitter is electrically connected with power supply.
Wherein, described rectifying tube discharge circuit comprises the 3rd driving tube; Described the 3rd driving tube base stage and the described second driving tube collector electrode are connected to first node, and the source electrode of collector electrode and described rectifying tube is electrically connected on Section Point, and emitter is electrically connected with the gate pole of described rectifying tube.
As a kind of improvement of the present invention, be serially connected with the parallel driver circuit of forming by first resistance and first diode between described first driving tube base stage and the pwm signal, the negative electrode of described first diode links to each other with pwm signal, and anode links to each other with the first driving tube base stage.
As another kind of improvement the of the present invention, be serially connected with electric capacity between described first driving tube collector electrode and the described second driving tube base stage; The described second driving tube base stage links to each other with second diode anode, and emitter links to each other with described second diode cathode; Also be connected with second resistance between described first driving tube collector electrode and the described second driving tube emitter, described electric capacity two ends also are connected to the 3rd resistance, and the described second diode two ends also are connected to the 4th resistance.
BUCK drive circuit of the present invention, the described second driving tube emitter links to each other with described Section Point through second electric capacity; Also be serially connected with the 4th diode between described the 3rd driving tube collector electrode and the described rectifying tube source electrode, described the 4th diode anode links to each other with described the 3rd driving tube collector electrode, and negative electrode and described rectifying tube source electrode are connected in described Section Point; The emitter of described the 3rd driving tube links to each other with the negative electrode of the 3rd diode, and the collector electrode of base stage and described second driving tube, the anode of the 3rd diode are connected to described first node altogether; Go back cross-over connection between the anode of described the 4th diode and the described first node the 5th resistance is arranged.
First driving tube of the present invention can also substitute with metal-oxide-semiconductor.
The present invention utilizes triode commonly used to realize that the bootstrapping of rectifying tube drives, and cost is lower, by regulating the withstand voltage specification of triode, can satisfy the requirement that the bootstrapping of high pressure and low pressure drives.
Especially be serially connected with the parallel driver circuit of first resistance and first diode between the first driving tube base stage and the pwm signal, when pwm signal during by high step-down, the existence of first diode can make first driving tube that is in saturation conduction or magnifying state turn-off rapidly, helps the quick transmission of signal.
Be connected in series speed-up capacitor between the first driving tube collector electrode and the second driving tube base stage and can accelerate the speed that second driving tube turns on and off, thus the operate as normal of holding circuit.And second diode can protect the BE utmost point of second driving tube to be unlikely to bear back-pressure.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the embodiment of the invention one circuit structure diagram;
Fig. 2 is the embodiment of the invention two circuit structure diagrams;
Fig. 3 is the embodiment of the invention one given driving PWM, the Vgs oscillogram of Vgs rectification metal-oxide-semiconductor;
Fig. 4 is the BE waveform (CH2) of the embodiment of the invention one Q1, CE waveform (CH1) figure;
Vgs waveform (CH1) figure when Fig. 5 is the embodiment of the invention one big space rate;
Vgs waveform (CH1) figure when Fig. 6 is the little duty ratio of the embodiment of the invention one.
[embodiment]
Specific embodiments of the invention one are referring to shown in Figure 1, and wherein the first driving tube Q1, the second driving tube Q2 and both peripheral circuits constitute rectifying tube charging circuit 1.The 3rd driving tube Q3 and peripheral circuit thereof constitute rectifying tube discharge circuit 2.The drain electrode of rectification metal-oxide-semiconductor links to each other with Input voltage terminal VIN, gate pole links to each other with the 3rd driving tube Q3 emitter by the 6th resistance R 6, source electrode links to each other with Section Point B, Section Point B links to each other with the second driving tube Q2 emitter through second capacitor C 2, links to each other with the 3rd driving tube Q3 collector electrode through the 4th diode D4.Wherein, the 4th diode anode links to each other with the 3rd driving tube Q3 collector electrode, and negative electrode links to each other with Section Point B.Section Point B links to each other with output voltage terminal VOUT by the network of being made up of inductance L 1, the 3rd capacitor C 3 and the 6th diode D6.Inductance L 1 is serially connected between Section Point B and the voltage output end VOUT, and Section Point B is through the 6th diode D6 ground connection, and the 6th diode D6 negative electrode links to each other with Section Point B; Voltage output end VOUT is by the 3rd capacitor C 3 ground connection.The pwm signal of power supply control chip is by being linked to each other with the first driving tube Q1 base stage with the parallel driver circuit that the first diode D1 forms by first resistance R 1.Wherein, the anode of the first diode D1 links to each other with the base stage of first driving tube, and negative electrode links to each other with the pwm signal end.The first driving tube Q1 grounded emitter, collector electrode links to each other with the second driving tube Q2 base stage by speed-up capacitor C1.The second driving tube Q2 guarantees that by means of the second diode D2 that is connected between base stage and the emitter it does not bear back-pressure, and the anode of this second diode D2 links to each other with the base stage of the second driving tube Q2, and negative electrode links to each other with the emitter of the second driving tube Q2.Second resistance R 2 is connected between the second driving tube emitter and the first driving tube collector electrode.The 3rd resistance R 3 is connected to speed-up capacitor C1 two ends, and the 4th resistance R 4 is connected to the second driving tube D2 two ends.R2, C1, the network of D2 has constituted the discharge loop of C1.Power supply VCC powers to the second driving tube Q2 emitter through the 5th diode D5.Wherein, the 5th diode D5 anode links to each other with power end, and negative electrode links to each other with the second driving tube D2 emitter.The 3rd driving tube Q3 base stage and the second driving tube Q2 collector electrode are connected to first node A altogether, first node A links to each other with the 3rd driving tube Q3 collector electrode through the 5th resistance R 5, link to each other with the 6th resistance R 6 through the 3rd diode D3, the anode of the 3rd diode D3 links to each other with first node A, and negative electrode links to each other with resistance R 6.
In the embodiment of the invention one, the course of work concrete when the pwm signal of power supply control chip is added to drive circuit is as described below:
1. opening process:
Open signal when effective, pwm signal is a high level, can make first to drive the quick saturation conduction of pass Q1 by resistance R 1, by the effect of speed-up capacitor C1, the base stage of Q2 is drawn rapidly to be low level, the Q2 saturation conduction, bootstrap capacitor voltage is added to by Q2, D3 on the G-S of rectification metal-oxide-semiconductor, junction capacitance charging, the conducting of rectification metal-oxide-semiconductor, this moment, Q3 was because the clamped effect of D3 is in by state, and the BUCK circuit is in the rectification operating state.
2. turn off process:
When cut-off signals was effective, pwm signal was a low level, by the repid discharge of D1, can make Q1 withdraw from the saturation conduction state fast, Q1 turn-offs, and be filled with electric charge on the speed-up capacitor C1 this moment, because the shutoff of Q1 can make the BE utmost point of Q2 form back-pressure, Q2 turn-offs, and C1 discharges by R2 simultaneously.D2 can protect the BE utmost point back-pressure amplitude of Q2, is unlikely to exceed the back-pressure derate of Q2.Have no progeny when Q2 closes, because the Vgs of the rectification metal-oxide-semiconductor of BUCK circuit is filled with electric charge, Vgs is a high level, this moment R5, the existence of D4 can make the Q3 conducting, and the speed of conducting is by the resistance decision of R3, after the Q3 conducting, GS between capacitance voltage bleed off, make shutoff, BUCK circuit rectification state finishes, enter the afterflow state, the D6 conducting.When pwm signal when being high, repetitive process 1.
At pwm signal during by high step-down, R1, in the parallel driver circuit of D1, the existence of D1 can make the Q1 that is in saturation conduction or magnifying state turn-off rapidly, helps the quick transmission of signal.Speed-up capacitor C1 can accelerate the switching speed of Q2, thus the operate as normal of holding circuit.
Speed-up capacitor C1, its effect can make the second driving tube Q2 switch, the speed that quickening turns on and off, thereby the operate as normal of holding circuit.R2, R3, R4, C1, the network that D2 forms, D2 can protect the BE utmost point of Q2 to be unlikely to bear back-pressure, R2 and C1, D2 forms the discharge loop of speed-up capacitor C1.
In the rectifying tube discharge circuit 2 that is made of D3, R5, Q3, D4, R5 has determined the speed of opening of Q3, and D4 then mainly plays the effect that main loop of power circuit disturbs of stopping.
In the embodiment of the invention two, the also available metal-oxide-semiconductor of the first driving tube Q1 substitutes.
The present invention utilizes elements such as triode commonly used to realize the BUCK driving, and is with low cost, simultaneously by adjusting the withstand voltage specification of triode, can satisfy the requirement that the bootstrapping of high pressure and low pressure drives.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. BUCK drive circuit, rectifying tube is included in the BUCK circuit, be used for the voltage of Switching Power Supply is outputed to voltage output end (VOUT) by voltage input end (VIN) rectification, it is characterized in that, comprise: rectifying tube charging circuit (1), being used for when PWM opens signal controlling described rectifying tube charged makes described BUCK circuit be in the rectification operating state; Rectifying tube discharge circuit (2), being used for when the PWM cut-off signals is controlled described rectifying tube discharged makes described BUCK circuit be in the afterflow operating state; Described rectifying tube charging circuit (1) comprises first driving tube (Q1) and second driving tube (Q2); Described first driving tube (Q1) base stage is electrically connected grounded emitter with pwm signal; Described second driving tube (Q2) base stage is electrically connected with described first driving tube (Q1) collector electrode, and collector electrode is electrically connected with the gate pole of described rectifying tube through the 3rd diode (D3), and emitter is electrically connected with power supply (VCC).
2. BUCK drive circuit as claimed in claim 1 is characterized in that: described rectifying tube discharge circuit (2) comprises the 3rd driving tube (Q3); Described the 3rd driving tube (Q3) base stage and described second driving tube (Q2) collector electrode are connected to first node (A), and the source electrode of collector electrode and described rectifying tube is electrically connected on Section Point (B), and emitter is electrically connected with the gate pole of described rectifying tube.
3. BUCK drive circuit as claimed in claim 1 or 2, it is characterized in that, be serially connected with the parallel driver circuit of forming by first resistance (R1) and first diode (D1) between described first driving tube (Q1) base stage and the pwm signal, the negative electrode of described first diode (D1) links to each other with pwm signal, and anode links to each other with first driving tube (Q1) base stage.
4. BUCK drive circuit as claimed in claim 1 or 2 is characterized in that, is serially connected with electric capacity (C1) between described first driving tube (Q1) collector electrode and described second driving tube (Q2) base stage; Described second driving tube (Q2) base stage links to each other with second diode (D2) anode, and emitter links to each other with described second diode (D2) negative electrode; Also be connected with second resistance (R2) between described first driving tube (Q1) collector electrode and described second driving tube (Q2) emitter, described electric capacity (C1) two ends also are connected to the 3rd resistance (R3), and described second diode (D2) two ends also are connected to the 4th resistance (R4).
5. BUCK drive circuit as claimed in claim 2 is characterized in that, described second driving tube (Q2) emitter links to each other with described Section Point (B) through second electric capacity (C2); Also be serially connected with the 4th diode (D4) between described the 3rd driving tube (Q3) collector electrode and the described rectifying tube source electrode, described the 4th diode (D4) anode links to each other with described the 3rd driving tube (Q3) collector electrode, and negative electrode and described rectifying tube source electrode are connected in described Section Point (B); The emitter of described the 3rd driving tube (Q3) links to each other with the negative electrode of the 3rd diode (D3), and the collector electrode of base stage and described second driving tube (Q2), the anode of the 3rd diode (D3) are connected to described first node (A) altogether; Go back cross-over connection between the anode of described the 4th diode (D4) and the described first node (A) the 5th resistance (R5) is arranged.
6. BUCK drive circuit as claimed in claim 1 is characterized in that, described rectifying tube charging circuit (1) comprises first driving tube (Q1) and second driving tube (Q2); Described first driving tube (Q1) is a metal-oxide-semiconductor, and gate pole is electrically connected with pwm signal, source ground; Described second driving tube (Q2) base stage is electrically connected with described first driving tube (Q1) drain electrode, and collector electrode is electrically connected with the gate pole of described rectifying tube through the 3rd diode (D3), and emitter is electrically connected with power supply (VCC).
7. BUCK drive circuit as claimed in claim 6, it is characterized in that, be serially connected with the parallel driver circuit of first resistance (R1) and first diode (D1) between described first driving tube (Q1) gate pole and the pwm signal, the negative electrode of described first diode (D1) links to each other with pwm signal, and anode links to each other with first driving tube (Q1) gate pole.
8. as claim 6 or 7 described BUCK drive circuits, it is characterized in that, be serially connected with electric capacity (C1) between described first driving tube (Q1) drain electrode and described second driving tube (Q2) base stage, described second driving tube (Q2) base stage links to each other with second diode (D2) anode, emitter links to each other with described second diode (D2) negative electrode, and collector electrode is electrically connected with the gate pole of described rectifying tube by the 3rd diode (D3); Also be connected with second resistance (R2) between described first driving tube (Q1) drain electrode and described second driving tube (Q2) emitter, described electric capacity (C1) two ends also are connected to the 3rd resistance (R3), and described second diode (D2) two ends also are connected to the 4th resistance (R4).
9. BUCK drive circuit as claimed in claim 8, it is characterized in that, described second driving tube (Q2) emitter is through the negative electrode of second electric capacity (C2) with the 4th diode (D4), the source electrode of described rectifying tube is connected to Section Point (B) altogether, described the 4th diode (D4) anode links to each other with described the 3rd driving tube (Q3) collector electrode, the emitter of described the 3rd driving tube (Q3) links to each other with the negative electrode of the 3rd diode (D3), the base stage of the anode of described the 3rd diode (D3) and the 3rd driving tube (Q3), the collector electrode of described second driving tube (Q2) is connected to first node (A) altogether; Cross-over connection has the 5th resistance (R5) between the anode of described the 4th diode (D4) and the described first node (A).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100645473A CN100536302C (en) | 2006-12-27 | 2006-12-27 | BUCK driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100645473A CN100536302C (en) | 2006-12-27 | 2006-12-27 | BUCK driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1996731A CN1996731A (en) | 2007-07-11 |
| CN100536302C true CN100536302C (en) | 2009-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100645473A Expired - Fee Related CN100536302C (en) | 2006-12-27 | 2006-12-27 | BUCK driving circuit |
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| Country | Link |
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| CN (1) | CN100536302C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944847B (en) * | 2010-09-07 | 2013-03-20 | 思瑞浦微电子科技（苏州）有限公司 | Bootstrap switch circuit |
| CN108448886B (en) * | 2018-04-17 | 2020-08-18 | 华南理工大学 | Boock converter bootstrap drive circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5745352A (en) * | 1994-10-27 | 1998-04-28 | Sgs-Thomson Microelectronics S.R.L. | DC-to-DC converter functioning in a pulse-skipping mode with low power consumption and PWM inhibit |
| CN1387305A (en) * | 2002-06-15 | 2002-12-25 | 艾默生网络能源有限公司 | Circuit of switching power supply with secondary power supply and its drive method |
-
2006
- 2006-12-27 CN CNB2006100645473A patent/CN100536302C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5745352A (en) * | 1994-10-27 | 1998-04-28 | Sgs-Thomson Microelectronics S.R.L. | DC-to-DC converter functioning in a pulse-skipping mode with low power consumption and PWM inhibit |
| CN1387305A (en) * | 2002-06-15 | 2002-12-25 | 艾默生网络能源有限公司 | Circuit of switching power supply with secondary power supply and its drive method |
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| Publication number | Publication date |
|---|---|
| CN1996731A (en) | 2007-07-11 |
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Owner name: POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20140903 |
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Free format text: CORRECT: ADDRESS; FROM: 518057 SHENZHEN, GUANGDONG PROVINCE TO: 518101 SHENZHEN, GUANGDONG PROVINCE |
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Effective date of registration: 20140903 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Yada Power Products (Shenzhen) Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: EMERSON NETWORK POWER Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090902 Termination date: 20211227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |