CN104038061A - Input adaptive auto-excitation type Buck converter - Google Patents
Input adaptive auto-excitation type Buck converter Download PDFInfo
- Publication number
- CN104038061A CN104038061A CN201410256645.1A CN201410256645A CN104038061A CN 104038061 A CN104038061 A CN 104038061A CN 201410256645 A CN201410256645 A CN 201410256645A CN 104038061 A CN104038061 A CN 104038061A
- Authority
- CN
- China
- Prior art keywords
- positive
- resistance
- negative
- bjt pipe
- input adaptive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention relates to an input adaptive auto-excitation type Buck converter. The input adaptive auto-excitation type Buck converter comprises a main loop and an input adaptive control circuit which is used for adaptive current limit protection; the main loop comprises an input capacitor Ci, an inductor L, a PNP type BJT tube Q3, an output capacitor Co, a drive circuit used for driving the PNP type BJT tube Q3 and a flywheel sub-circuit used for lowering the follow current conduction loss; the drive circuit comprises an NPN type BJT tube Q2, a resistor R2, a resistor R4, a resistor R6 and a diode D1, and the input adaptive control circuit comprises an NPN type BJT tube Q1, a diode D2, a resistor R1, a resistor R3 and a resistor R5. According to the input adaptive auto-excitation type Buck converter, the input adaptive control circuit controls the current of the inductor L or the collecting electrode current of the PNP type BJT tube Q3 and has a current limit function with the input adaptive characteristic, and moreover, the input adaptive control circuit also realizes smaller current detection loss; the flywheel sub-circuit enables the follow current conduction loss of the Buck converter to be lowered and the input adaptive auto-excitation type Buck converter is very suitable for auxiliary switching power supplies, LED drive, energy collection and the like.
Description
Technical field
The present invention relates to autonomous DC-DC converter technical field, relate in particular to a kind of input adaptive auto-excitation type Buck converter.
Background technology
Chinese patent ZL201210154711.5 discloses a kind of " main switch drives the little BJT type auto-excitation type Buck converter of loss ", as shown in Figure 1, it comprises by input capacitance Ci, positive-negative-positive BJT manages Q1, diode D, the major loop that inductance L and capacitor C o form and by resistance R 1, resistance R 2, resistance R 3, capacitor C 1, the driver element of the main switch Q1 that NPN type BJT pipe (bipolar junction transistor) Q2 and positive-negative-positive BJT pipe Q3 form, also comprise by resistance R 4, resistance R 5, resistance R 6, capacitor C 2, the current feedback branch road that diode D1 and NPN type BJT pipe Q4 form.This kind of Buck converter has the voltage transformation function of step-down, and circuit structure is simple, components and parts number is few, do not need coupling inductance to participate in the self-excitation work of circuit.But the current feedback branch road of above-mentioned Buck converter adopts the electric current of resistance R 6 direct-detection inductance L, loss is larger; Meanwhile, major loop adopts diode D for afterflow, and afterflow conduction loss is larger, thereby the total losses of converter are high.
Summary of the invention
Technical problem to be solved by this invention is the deficiency at aspects such as current detecting loss, important devices current-limiting protection ability, afterflow conduction losses for existing auto-excitation type Buck converter, and a kind of have the current-limiting protection ability of input adaptive, the input adaptive auto-excitation type Buck converter that current detecting loss is less and afterflow conduction loss is less are provided.
For addressing the above problem, technical scheme of the present invention is:
A kind of input adaptive auto-excitation type Buck converter, described Buck converter comprises major loop and the input adaptive control circuit of protecting for adaptive throttling, described major loop comprises input capacitance Ci, inductance L, positive-negative-positive BJT manages Q3, output capacitance Co, for driving the drive circuit of positive-negative-positive BJT pipe Q3 and for reducing the afterflow electronic circuit of afterflow conduction loss, described drive circuit comprises NPN type BJT pipe Q2, resistance R 2, resistance R 4, resistance R 6 and diode D1, described input adaptive control circuit comprises NPN type BJT pipe Q1, diode D2, resistance R 1, resistance R 3 and resistance R 5,
Described input capacitance Ci is connected in parallel on the two ends of direct voltage source Vi, output capacitance Co both end voltage is VD Vo, the anode of direct voltage source Vi is connected with the positive-negative-positive BJT pipe emitter of Q3 and one end of resistance R 1, the positive-negative-positive BJT pipe collector electrode of Q3 and one end of inductance L, one end of the negative electrode of diode D1 and resistance R 2 is connected, the other end of inductance L is connected with one end of resistance R 6 and the anode of VD Vo, the negative terminal of VD Vo is connected with one end of resistance R 3 with one end of resistance R 5, one end of the other end of resistance R 5 and resistance R 4, the NPN type BJT pipe emitter of Q1 and the negative terminal of direct voltage source Vi are connected, the NPN type BJT pipe base stage of Q1 and the other end of resistance R 1 are connected with the other end of resistance R 3, the collector electrode of NPN type BJT pipe Q1 is connected with the negative electrode of diode D2, the anode of the anode of diode D2 and diode D1, the base stage of the other end of resistance R 2 and NPN type BJT pipe Q2 is connected, the emitter of NPN type BJT pipe Q2 is connected with the other end of resistance R 4, the collector electrode of NPN type BJT pipe Q2 is connected with the positive-negative-positive BJT pipe base stage of Q3 and the other end of resistance R 6, afterflow electronic circuit is connected between the positive-negative-positive BJT pipe collector electrode of Q3 and the negative terminal of VD Vo.
Preferably, when the DC current gain β 1 of the resistance of the resistance of described resistance R 1, resistance R 2 and NPN type BJT pipe Q1 meets following condition, the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 carries out self adaptation adjusting according to the size of direct voltage source Vi; When (R1-β 1R2) <0, described Buck converter has the negative characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 becomes negative linear relationship with direct voltage source Vi; When (R1-β 1R2) >0, described Buck converter has the positive characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 becomes linear positive relation with direct voltage source Vi; When (R1-β 1R2)=0, described Buck converter has the null character of input adaptive, and collector current maximum ic3m and the direct voltage source Vi of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 are irrelevant.
Preferably, described afterflow electronic circuit comprises positive-negative-positive BJT pipe Q5, NPN type BJT pipe Q4, resistance R 7 and resistance R 9, the collector electrode of positive-negative-positive BJT pipe Q3 is connected with one end of resistance R 9 with the emitter of NPN type BJT pipe Q4, the other end of inductance L is connected with the emitter of positive-negative-positive BJT pipe Q5, the negative terminal of VD Vo is connected with the collector electrode of NPN type BJT pipe Q4, the base stage of NPN type BJT pipe Q4 is connected with one end of resistance R 7, the other end of resistance R 7 is connected with the collector electrode of positive-negative-positive BJT pipe Q5, and the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R 9.
Preferably, described afterflow electronic circuit also comprises resistance R 8, resistance R 10, capacitor C 3 and capacitor C 4, one end of resistance R 8 is connected with the negative terminal of VD Vo, the other end of resistance R 8 is connected with the base stage of NPN type BJT pipe Q4, resistance R 10 is connected in parallel between the emitter and base stage of positive-negative-positive BJT pipe Q5, capacitor C 3 is connected in parallel on the two ends of resistance R 7, and capacitor C 4 is connected in parallel on the two ends of resistance R 9.
Preferably, described input adaptive control circuit also comprises capacitor C 2, and one end of capacitor C 2 is connected with the negative terminal of VD Vo, and the other end of capacitor C 2 is connected with the base stage of NPN type BJT pipe Q1.
Preferably, described drive circuit also comprises capacitor C 1, and one end of capacitor C 1 is connected with the collector electrode of positive-negative-positive BJT pipe Q3, and the other end of capacitor C 1 is connected with the anode of diode D2.
Preferably, described drive circuit also comprises diode D3, and the negative electrode of diode D3 is connected with the anode of direct voltage source Vi, and the anode of diode D3 is connected with the collector electrode of positive-negative-positive BJT pipe Q3.
Preferably, described drive circuit also comprises voltage-stabiliser tube Z, and the negative electrode of voltage-stabiliser tube Z is connected with the base stage of NPN type BJT pipe Q2, and the anode of voltage-stabiliser tube Z is connected with the negative terminal of direct voltage source Vi.
Be compared to prior art, input adaptive auto-excitation type Buck converter of the present invention is controlled the electric current of inductance L or the collector current of positive-negative-positive BJT pipe Q3 by input adaptive control circuit, the current-limiting function with input adaptive feature, and, by input adaptive control circuit, also realized less current detecting loss; Afterflow electronic circuit has reduced the afterflow conduction loss of Buck converter, is applicable to very much the application of the aspects such as auxiliary switching power supply, LED driving, collection of energy.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of Buck converter in prior art.
Fig. 2 is the circuit diagram of input adaptive auto-excitation type Buck converter of the present invention.
Fig. 3 is the circuit diagram of input adaptive auto-excitation type Buck converter embodiment 1 of the present invention.
Simulation work oscillogram when Fig. 4 is input adaptive auto-excitation type Buck converter embodiment of the present invention 1 stable state under inductive current iL critical continuous conduction mode.
Fig. 5 is the circuit diagram of input adaptive auto-excitation type Buck converter embodiment 2 of the present invention.
Simulation work oscillogram when Fig. 6 is input adaptive auto-excitation type Buck converter embodiment of the present invention 2 stable state under inductive current iL critical continuous conduction mode.
Embodiment
Below in conjunction with drawings and Examples, further describe the present invention, but protection scope of the present invention is not limited to this.
With reference to Fig. 2, input adaptive auto-excitation type Buck converter of the present invention comprises major loop and the input adaptive control circuit of protecting for adaptive throttling, described major loop comprises input capacitance Ci, inductance L, positive-negative-positive BJT manages Q3, output capacitance Co, for driving the drive circuit of positive-negative-positive BJT pipe Q3 and for reducing the afterflow electronic circuit of afterflow conduction loss, described drive circuit comprises NPN type BJT pipe Q2, resistance R 2, resistance R 4, resistance R 6 and diode D1, described input adaptive control circuit comprises NPN type BJT pipe Q1, diode D2, resistance R 1, resistance R 3 and resistance R 5.
Described input capacitance Ci is connected in parallel on the two ends of direct voltage source Vi, output capacitance Co both end voltage is VD Vo, load R is connected in parallel on the two ends of output capacitance Co, the anode of direct voltage source Vi is connected with the positive-negative-positive BJT pipe emitter of Q3 and one end of resistance R 1, the positive-negative-positive BJT pipe collector electrode of Q3 and one end of inductance L, one end of the negative electrode of diode D1 and resistance R 2 is connected, the other end of inductance L is connected with one end of resistance R 6 and the anode of VD Vo, the negative terminal of VD Vo is connected with one end of resistance R 3 with one end of resistance R 5, one end of the other end of resistance R 5 and resistance R 4, the NPN type BJT pipe emitter of Q1 and the negative terminal of direct voltage source Vi are connected, the NPN type BJT pipe base stage of Q1 and the other end of resistance R 1 are connected with the other end of resistance R 3, the collector electrode of NPN type BJT pipe Q1 is connected with the negative electrode of diode D2, the anode of the anode of diode D2 and diode D1, the base stage of the other end of resistance R 2 and NPN type BJT pipe Q2 is connected, the emitter of NPN type BJT pipe Q2 is connected with the other end of resistance R 4, the collector electrode of NPN type BJT pipe Q2 is connected with the positive-negative-positive BJT pipe base stage of Q3 and the other end of resistance R 6, afterflow electronic circuit is connected between the positive-negative-positive BJT pipe collector electrode of Q3 and the negative terminal of VD Vo.
The present invention has current-limiting function, and at Buck converter, during in stable state under inductive current iL critical continuous conduction mode, the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 meets following formula:
Wherein, ic3m is the collector current maximum of positive-negative-positive BJT pipe Q3, ib3 is the base current of positive-negative-positive BJT pipe Q3, β 3 is the DC current gain of positive-negative-positive BJT pipe Q3, ic1 is the collector current of NPN type BJT pipe Q1, β 1 is the DC current gain of NPN type BJT pipe Q1, ic2 is the collector current of NPN type BJT pipe Q2, ib2 is the base current of NPN type BJT pipe Q2, β 2 is the DC current gain of NPN type BJT pipe Q2, VBE1 is the base-emitter conduction voltage drop of NPN type BJT pipe Q1, VBE2 is the base-emitter conduction voltage drop of NPN type BJT pipe Q2, VEC3 is emitter-collector saturation voltage and the conducting voltage of positive-negative-positive BJT pipe Q3.
Simplify above-mentioned expression formula, can be as shown in the formula (1):
Wherein, β 1 is the DC current gain of NPN type BJT pipe Q1, β 2 is DC current gain of NPN type BJT pipe Q2, β 3 is DC current gain of positive-negative-positive BJT pipe Q3, VBE1 is the base-emitter conduction voltage drop of NPN type BJT pipe Q1, VBE2 is the base-emitter conduction voltage drop of NPN type BJT pipe Q2, and VEC3 is emitter-collector saturation voltage and the conduction voltage drop of positive-negative-positive BJT pipe Q3.
When the DC current gain β 1 of the resistance of the resistance of described resistance R 1, resistance R 2 and NPN type BJT pipe Q1 meets following condition, the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 carries out self adaptation adjusting according to the size of direct voltage source Vi; When (R1-β 1R2) <0, described Buck converter has the negative characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 becomes negative linear relationship with direct voltage source Vi; When (R1-β 1R2) >0, described Buck converter has the positive characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 becomes linear positive relation with direct voltage source Vi; When (R1-β 1R2)=0, described Buck converter has the null character of input adaptive, and collector current maximum ic3m and the direct voltage source Vi of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 are irrelevant.
Embodiment 1:
With reference to Fig. 3, embodiment 1 comprises major loop and for the input adaptive control circuit of adaptive throttling protection, and described major loop comprises input capacitance Ci, inductance L, positive-negative-positive BJT pipe Q3, output capacitance Co, for driving the drive circuit of positive-negative-positive BJT pipe Q3 and for reducing the afterflow electronic circuit of afterflow conduction loss; Described drive circuit comprises NPN type BJT pipe Q2, resistance R 2, resistance R 4, resistance R 6, diode D1, capacitor C 1 and diode D3; Described input adaptive control circuit comprises NPN type BJT pipe Q1, diode D2, resistance R 1, capacitor C 2, resistance R 3 and resistance R 5; Described afterflow electronic circuit comprises positive-negative-positive BJT pipe Q5, NPN type BJT pipe Q4, resistance R 7, resistance R 9, resistance R 8, resistance R 10, capacitor C 3 and capacitor C 4.The effect of diode D3 is to direct voltage source Vi by unnecessary parasitic oscillation energy feedback, the effect of capacitor C 1 is the switching speed of improving NPN type BJT pipe Q2, the effect of capacitor C 3 is switching speeds of improving NPN type BJT pipe Q4, the effect of capacitor C 4 is switching speeds of improving positive-negative-positive BJT pipe Q5, the effect of capacitor C 2 is dynamic properties of improving input adaptive control circuit, the effect of R8 is to prevent NPN type BJT pipe Q4 reverse-conducting, and the effect of resistance R 10 is somes switching time of optimizing positive-negative-positive BJT pipe Q5.
Described input capacitance Ci is in parallel with direct voltage source Vi, described output capacitance Co both end voltage is VD Vo, load R is in parallel with described output capacitance Co, the negative electrode of the anode of direct voltage source Vi and diode D3, the positive-negative-positive BJT pipe emitter of Q3 and one end of resistance R 1 are connected, the positive-negative-positive BJT pipe collector electrode of Q3 and one end of inductance L, the emitter of NPN type BJT pipe Q4, the anode of diode D3, the negative electrode of diode D1, one end of resistance R 2, one end of capacitor C 1, one end of one end of capacitor C 4 and resistance R 9 is connected, one end of the other end of inductance L and resistance R 6, the emitter of positive-negative-positive BJT pipe Q5, the anode of one end of resistance R 10 and VD Vo is connected, one end of the negative terminal of VD Vo and resistance R 8, the collector electrode of NPN type BJT pipe Q4, one end of resistance R 5, one end of one end of resistance R 3 and capacitor C 2 is connected, one end of the other end of resistance R 5 and resistance R 4, the NPN type BJT pipe emitter of Q1 and the negative terminal of direct voltage source Vi are connected, the NPN type BJT pipe base stage of Q4 and the other end of resistance R 8, one end of one end of resistance R 7 and capacitor C 3 is connected, the other end of resistance R 7 is connected with the other end of capacitor C 3 and the collector electrode of positive-negative-positive BJT pipe Q5, the positive-negative-positive BJT pipe base stage of Q5 and the other end of resistance R 10, the other end of the other end of resistance R 9 and capacitor C 4 is connected, the NPN type BJT pipe base stage of Q1 and the other end of resistance R 1, the other end of the other end of resistance R 3 and capacitor C 2 is connected, the collector electrode of NPN type BJT pipe Q1 is connected with the negative electrode of diode D2, the anode of the anode of diode D2 and diode D1, the other end of resistance R 2, the base stage of the other end of capacitor C 1 and NPN type BJT pipe Q2 is connected, the emitter of NPN type BJT pipe Q2 is connected with the other end of resistance R 4, the collector electrode of NPN type BJT pipe Q2 is connected with the positive-negative-positive BJT pipe base stage of Q3 and the other end of resistance R 6.
Technical conceive of the present invention is: the input adaptive control unit that the auto-excitation type Buck converter using of input adaptive is comprised of NPN type BJT pipe Q1, diode D2, resistance R 1, resistance R 3, capacitor C 2, resistance R 5, can obtain and have the current-limiting function of input adaptive feature and less current detecting loss; The afterflow electronic circuit that employing is comprised of positive-negative-positive BJT pipe Q5, NPN type BJT pipe Q4, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 3, capacitor C 4, can obtain less afterflow conduction loss.
With reference to Fig. 4, the operation principle of embodiment 1 is as follows:
In the steady operation cycle (t11 to t13), the operating state of embodiment 1 under inductive current iL critical continuous conduction mode roughly can be divided into 2 stages: t11 to t12 stage and t12 to t13 stage.Convenient for setting forth below, in omission the present embodiment, the Chinese of each components and parts, only represents with symbol.
When embodiment 1 is in t11 to t12 during the stage, Q3, Q2 saturation conduction, the linear amplification of Q1 conducting, D2 conducting, D1, Q4, Q5 cut-off, Vi, Q3, L, Co, R and R5 form a loop, L charging, the collector current ic3 of the current i L of L and Q3 is all since 0 increase, and the collector voltage vc3 of Q3 also starts to reduce from Vi thereupon, and the base current ib3 of Q3 reduces gradually simultaneously.
When embodiment 1 is in t12 to t13 during the stage, D1 conducting, Q4, Q5 saturation conduction, Q3, Q2, D2 cut-off, the base-emitter conducting situation of Q1 is depending on Vi, Q4, L, Co and R form a loop, L electric discharge, the collector current ic4 of inductive current iL and Q4 all reduces until the collector voltage vc3 of 0, Q3 approximates 0, the base voltage vb2 of Q2 approximates 0, and the base current ib3 of Q3 is 0 simultaneously.
Embodiment 1 has current-limiting function, if do not consider the impact of capacitor C 2, the collector current maximum ic3m of the current maxima iLm of L or Q3 meets formula (1),
When (R1-β 1R2) <0, embodiment 1 has the negative characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of L or Q3 becomes negative linear relationship with direct voltage source Vi.When (R1-β 1R2) >0, embodiment 1 has the positive characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of L or Q3 becomes linear positive relation with direct voltage source Vi.When (R1-β 1R2)=0, embodiment 1 has the null character of input adaptive, and the collector current maximum ic3m of the current maxima iLm of L or Q3 and direct voltage source Vi are irrelevant.
Embodiment 2:
With reference to Fig. 5, embodiment 2 also comprises voltage-stabiliser tube Z on the basis of embodiment 1, and the negative electrode of voltage-stabiliser tube Z is connected with the base stage of NPN type BJT pipe Q2, and the anode of voltage-stabiliser tube Z is connected with the negative terminal of direct voltage source Vi, and voltage-stabiliser tube Z has the effect of widening circuit working scope.
With reference to Fig. 6, the circuit working principle of embodiment 2 is similar to embodiment 1, also has the current-limiting function of input adaptive.In the steady operation cycle (t21 to t23), the operating state of embodiment 2 under inductive current iL critical continuous conduction mode roughly can be divided into 2 stages: t21 to t22 stage and t22 to t23 stage.Difference is mainly: when embodiment 2 is in t21 to t22 during the stage, the base voltage vb2 of Q2 equals the reverse-conducting pressure drop VZ of voltage-stabiliser tube Z.
In above-mentioned explanation, all special instructions that do not add, all adopt routine techniques means of the prior art.
Claims (8)
1. an input adaptive auto-excitation type Buck converter, it is characterized in that, described Buck converter comprises major loop and the input adaptive control circuit of protecting for adaptive throttling, described major loop comprises input capacitance Ci, inductance L, positive-negative-positive BJT manages Q3, output capacitance Co, for driving the drive circuit of positive-negative-positive BJT pipe Q3 and for reducing the afterflow electronic circuit of afterflow conduction loss, described drive circuit comprises NPN type BJT pipe Q2, resistance R 2, resistance R 4, resistance R 6 and diode D1, described input adaptive control circuit comprises NPN type BJT pipe Q1, diode D2, resistance R 1, resistance R 3 and resistance R 5,
Described input capacitance Ci is connected in parallel on the two ends of direct voltage source Vi, output capacitance Co both end voltage is VD Vo, the anode of direct voltage source Vi is connected with the positive-negative-positive BJT pipe emitter of Q3 and one end of resistance R 1, the positive-negative-positive BJT pipe collector electrode of Q3 and one end of inductance L, one end of the negative electrode of diode D1 and resistance R 2 is connected, the other end of inductance L is connected with one end of resistance R 6 and the anode of VD Vo, the negative terminal of VD Vo is connected with one end of resistance R 3 with one end of resistance R 5, one end of the other end of resistance R 5 and resistance R 4, the NPN type BJT pipe emitter of Q1 and the negative terminal of direct voltage source Vi are connected, the NPN type BJT pipe base stage of Q1 and the other end of resistance R 1 are connected with the other end of resistance R 3, the collector electrode of NPN type BJT pipe Q1 is connected with the negative electrode of diode D2, the anode of the anode of diode D2 and diode D1, the base stage of the other end of resistance R 2 and NPN type BJT pipe Q2 is connected, the emitter of NPN type BJT pipe Q2 is connected with the other end of resistance R 4, the collector electrode of NPN type BJT pipe Q2 is connected with the positive-negative-positive BJT pipe base stage of Q3 and the other end of resistance R 6, afterflow electronic circuit is connected between the positive-negative-positive BJT pipe collector electrode of Q3 and the negative terminal of VD Vo.
2. input adaptive auto-excitation type Buck converter according to claim 1, it is characterized in that, when the DC current gain β 1 of the resistance of the resistance of described resistance R 1, resistance R 2 and NPN type BJT pipe Q1 meets following condition, the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 carries out self adaptation adjusting according to the size of direct voltage source Vi; When (R1-β 1R2) <0, described Buck converter has the negative characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 becomes negative linear relationship with direct voltage source Vi; When (R1-β 1R2) >0, described Buck converter has the positive characteristic of input adaptive, and the collector current maximum ic3m of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 becomes linear positive relation with direct voltage source Vi; When (R1-β 1R2)=0, described Buck converter has the null character of input adaptive, and collector current maximum ic3m and the direct voltage source Vi of the current maxima iLm of inductance L or positive-negative-positive BJT pipe Q3 are irrelevant.
3. input adaptive auto-excitation type Buck converter according to claim 1, it is characterized in that, described afterflow electronic circuit comprises positive-negative-positive BJT pipe Q5, NPN type BJT manages Q4, resistance R 7 and resistance R 9, the collector electrode of positive-negative-positive BJT pipe Q3 is connected with one end of resistance R 9 with the emitter of NPN type BJT pipe Q4, the other end of inductance L is connected with the emitter of positive-negative-positive BJT pipe Q5, the negative terminal of VD Vo is connected with the collector electrode of NPN type BJT pipe Q4, the base stage of NPN type BJT pipe Q4 is connected with one end of resistance R 7, the other end of resistance R 7 is connected with the collector electrode of positive-negative-positive BJT pipe Q5, the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R 9.
4. input adaptive auto-excitation type Buck converter according to claim 3, it is characterized in that, described afterflow electronic circuit also comprises resistance R 8, resistance R 10, capacitor C 3 and capacitor C 4, one end of resistance R 8 is connected with the negative terminal of VD Vo, the other end of resistance R 8 is connected with the base stage of NPN type BJT pipe Q4, resistance R 10 is connected in parallel between the emitter and base stage of positive-negative-positive BJT pipe Q5, and capacitor C 3 is connected in parallel on the two ends of resistance R 7, and capacitor C 4 is connected in parallel on the two ends of resistance R 9.
5. input adaptive auto-excitation type Buck converter according to claim 1, it is characterized in that, described input adaptive control circuit also comprises capacitor C 2, and one end of capacitor C 2 is connected with the negative terminal of VD Vo, and the other end of capacitor C 2 is connected with the base stage of NPN type BJT pipe Q1.
6. input adaptive auto-excitation type Buck converter according to claim 1, is characterized in that, described drive circuit also comprises capacitor C 1, and one end of capacitor C 1 is connected with the collector electrode of positive-negative-positive BJT pipe Q3, and the other end of capacitor C 1 is connected with the anode of diode D2.
7. according to the input adaptive auto-excitation type Buck converter described in any one in claim 1-6, it is characterized in that, described drive circuit also comprises diode D3, and the negative electrode of diode D3 is connected with the anode of direct voltage source Vi, and the anode of diode D3 is connected with the collector electrode of positive-negative-positive BJT pipe Q3.
8. according to the input adaptive auto-excitation type Buck converter described in any one in claim 7, it is characterized in that, described drive circuit also comprises voltage-stabiliser tube Z, and the negative electrode of voltage-stabiliser tube Z is connected with the base stage of NPN type BJT pipe Q2, and the anode of voltage-stabiliser tube Z is connected with the negative terminal of direct voltage source Vi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256645.1A CN104038061B (en) | 2014-06-10 | 2014-06-10 | Input adaptive auto-excitation type Buck converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256645.1A CN104038061B (en) | 2014-06-10 | 2014-06-10 | Input adaptive auto-excitation type Buck converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104038061A true CN104038061A (en) | 2014-09-10 |
| CN104038061B CN104038061B (en) | 2016-05-04 |
Family
ID=51468701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410256645.1A Active CN104038061B (en) | 2014-06-10 | 2014-06-10 | Input adaptive auto-excitation type Buck converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104038061B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114157147A (en) * | 2021-11-30 | 2022-03-08 | 东南大学 | High-power-density auxiliary power supply based on self-excited buck converter |
| CN114400897A (en) * | 2022-02-17 | 2022-04-26 | 深圳信息职业技术学院 | Self-excitation type Buck converter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337773A (en) * | 2000-08-16 | 2002-02-27 | 伊博电源（杭州）有限公司 | Autonomous DC-DC converter |
| CN101877532A (en) * | 2010-06-28 | 2010-11-03 | 浙江工业大学 | Bipolar transistor auto-excitation type Buck convertor |
| CN102522892A (en) * | 2011-11-22 | 2012-06-27 | 浙江工业大学 | Auto-excitation-type Buck converter based on metal oxide semiconductor field effect transistor (MOSFET) |
| CN102820784A (en) * | 2012-05-17 | 2012-12-12 | 浙江工业大学 | BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss |
| US20140111113A1 (en) * | 2012-10-18 | 2014-04-24 | Power Integrations, Inc. | Simplified current sense for buck led driver |
-
2014
- 2014-06-10 CN CN201410256645.1A patent/CN104038061B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337773A (en) * | 2000-08-16 | 2002-02-27 | 伊博电源（杭州）有限公司 | Autonomous DC-DC converter |
| CN101877532A (en) * | 2010-06-28 | 2010-11-03 | 浙江工业大学 | Bipolar transistor auto-excitation type Buck convertor |
| CN102522892A (en) * | 2011-11-22 | 2012-06-27 | 浙江工业大学 | Auto-excitation-type Buck converter based on metal oxide semiconductor field effect transistor (MOSFET) |
| CN102820784A (en) * | 2012-05-17 | 2012-12-12 | 浙江工业大学 | BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss |
| US20140111113A1 (en) * | 2012-10-18 | 2014-04-24 | Power Integrations, Inc. | Simplified current sense for buck led driver |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114157147A (en) * | 2021-11-30 | 2022-03-08 | 东南大学 | High-power-density auxiliary power supply based on self-excited buck converter |
| WO2023098199A1 (en) * | 2021-11-30 | 2023-06-08 | 东南大学 | High-power-density auxiliary power supply based on self-excited buck converter |
| CN114157147B (en) * | 2021-11-30 | 2023-08-15 | 东南大学 | High power density auxiliary power supply based on self-excited buck converter |
| CN114400897A (en) * | 2022-02-17 | 2022-04-26 | 深圳信息职业技术学院 | Self-excitation type Buck converter |
| CN114400897B (en) * | 2022-02-17 | 2022-12-20 | 深圳信息职业技术学院 | Self-excitation type Buck converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104038061B (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100438296C (en) | DC-DC converter | |
| CN101272098B (en) | Twin-triode current control type self-oscillation flyback converter | |
| CN102545662A (en) | Switch control circuit, converter using the same, and switch control method | |
| CN107659160B (en) | A kind of DC-DC constant-current circuit | |
| CN102497101B (en) | Self-excited Buck circuit | |
| CN103762851B (en) | Be applicable to the DC-DC conversion circuit that IGBT drive module high-pressure side powers | |
| CN104023455A (en) | LED (light emitting diode) constant-current drive circuit based on BJT (bipolar junction transistor) switch tube | |
| CN104038061B (en) | Input adaptive auto-excitation type Buck converter | |
| CN102820780B (en) | Bipolar junction transistor (BJT) auto-excitation type Zeta convertor with low main switch tube drive loss | |
| CN107710577A (en) | Power converter and the LED illumination circuit for including it | |
| CN103997212B (en) | The self-excitation Sepic converter of input adaptive | |
| CN102820784B (en) | BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss | |
| CN103986329B (en) | The self-excited type Cuk umformer of input self-adaptation | |
| CN209930165U (en) | Synchronous rectifying device using driving winding | |
| CN103501114A (en) | Flyback converter with critical connection mode | |
| CN104038057B (en) | Input adaptive auto-excitation type Zeta converter | |
| WO2023098199A1 (en) | High-power-density auxiliary power supply based on self-excited buck converter | |
| CN203445602U (en) | Flyback overvoltage protection circuit | |
| CN104038058A (en) | Input adaptive auto-excitation type Buck-boost converter | |
| CN102684493B (en) | BJT type self-excited Boost converter equipped with main switching tube with low drive loss | |
| CN112187045B (en) | Boock converter bootstrap drive circuit without negative current | |
| CN201733223U (en) | Bipolar transistor self-excitation type Buck converter | |
| CN203691246U (en) | DC-DC conversion circuit suitable for power supply to high-voltage side of IGBT (insulated gate bipolar transistor) drive module | |
| CN211701851U (en) | Switch power supply | |
| CN104038062A (en) | Input adaptive auto-excitation type Boost converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 311121, 1, 2, 26 Longtan Road, Hangzhou front street, Yuhang District, Zhejiang, China Applicant after: ZHEJIANG HRV ELECTRIC CO., LTD. Address before: 311121, 1, 2, 26 Longtan Road, Hangzhou front street, Yuhang District, Zhejiang, China Applicant before: Zhejiang Rifeng Electrical Co., Ltd. |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |