CN204271917U - Constant current Buck converter and constant-current control circuit thereof - Google Patents
Constant current Buck converter and constant-current control circuit thereof Download PDFInfo
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- CN204271917U CN204271917U CN201420823700.6U CN201420823700U CN204271917U CN 204271917 U CN204271917 U CN 204271917U CN 201420823700 U CN201420823700 U CN 201420823700U CN 204271917 U CN204271917 U CN 204271917U
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Abstract
This application discloses constant current Buck converter and constant-current control circuit thereof, this circuit comprises switch triggering and turns off latching circuit, sample circuit, reference circuit and compare drive circuit, wherein: switch triggering and shutoff latching circuit, for detecting inductance or diode both end voltage, when the voltage detected with it in MOS conducting time voltage direction contrary time, to comparing drive circuit output from lock control signal, otherwise export conductivity control signal; Sample circuit, for the current signal of the MOS that samples, and output current sampled signal is to comparing drive circuit; Reference circuit, for comparing drive circuit output current reference signal; Relatively drive circuit, turns off for the driven MOS when current sampling signal is not less than current reference signal; MOS closes and has no progeny, after receiving self-locking control signal, carry out shutoff self-locking to MOS; And receiving conductivity control signal rear drive MOS conducting, to avoid problem in degree of depth continuous mode, the problem includes: various problem.
Description
Technical field
The utility model relates to electric and electronic technical field, more particularly, relates to constant current Buck converter and constant-current control circuit thereof.
Background technology
Constant current Buck converter comprises main circuit and constant-current control circuit.Existing constant current Buck converter divides two large classes: a class is that main circuit adopts the floating ground of metal-oxide-semiconductor source class, diode anode ground connection, but constant-current control circuit needs high drive metal-oxide-semiconductor, and cost is higher, and circuit is more complicated; Another kind of is that main circuit adopts metal-oxide-semiconductor source class ground connection, although drive simple, constant-current control circuit cannot the inductive current of direct-detection metal-oxide-semiconductor blocking interval, can only realize indirect detection at present by the following two kinds of degree of depth continuous modes provided:
One determines frequency pattern, and current sample is done average treatment, does calculating to adjust duty ratio in inside, and prerequisite is that inductive current must be continuous, otherwise very large with regard to deviation.When output voltage changes, the ripple rate of inductance can change, if want in very large range to keep continuous state to need larger sensibility reciprocal.
Another kind determines ripple rate pattern, obtains the lowest point current value, then control the turn-off time in next cycle by opening detection sampling resistor voltage instantaneously at metal-oxide-semiconductor.Although this control mode ripple rate is controlled, be very easy to affect by diode reverse electric current, need to arrange sampling Dead Time, and different reverse recovery time of diodes is different.In addition, in these two kinds of degree of depth continuous modes, diode reverse recovery current can cause very strong electromagnetic interference.
Utility model content
In view of this, the utility model provides constant current Buck converter and constant-current control circuit thereof, to avoid problem in degree of depth continuous mode, the problem includes: various problem.
A kind of constant-current control circuit, is applied to the constant current Buck converter that main circuit adopts metal-oxide-semiconductor source ground, and this constant-current control circuit comprises switch triggering and turns off latching circuit, sample circuit, reference circuit and compare drive circuit, wherein:
Described switch triggering and shutoff latching circuit, for detecting inductance in described main circuit or diode both end voltage, when the voltage detected with it in described metal-oxide-semiconductor conducting time voltage direction contrary time, to the described drive circuit that compares output from lock control signal, otherwise, export conductivity control signal to the described drive circuit that compares;
Described sample circuit, the current signal on described metal-oxide-semiconductor of sampling, and output current sampled signal compares drive circuit to described;
Described reference circuit, for comparing drive circuit output current reference signal to described;
Describedly comparing drive circuit, for when judging that obtaining described current sampling signal is not less than described current reference signal, driving described metal-oxide-semiconductor to turn off; After receiving described self-locking control signal, shutoff self-locking is carried out to described metal-oxide-semiconductor; And after receiving described conductivity control signal, drive described metal-oxide-semiconductor conducting.
Wherein, the described drive circuit that compares is the first comparator; The in-phase input end of described first comparator connects described reference circuit, sample circuit described in its anti-phase input termination, and it exports the grid of metal-oxide-semiconductor described in termination.
Wherein, described switch triggering and shutoff latching circuit comprise diode and the second comparator, wherein:
The in-phase input end of described second comparator connects the anode of the diode in described main circuit, the negative electrode of the diode in main circuit described in its anti-phase input termination;
Described switch triggering and the anode of diode turned off in latching circuit connect the output of described second comparator, and its negative electrode connects the inverting input of described first comparator.
Wherein, described switch triggering and shutoff latching circuit comprise diode and the second comparator, wherein:
The first end of the inductance in main circuit described in the anti-phase input termination of described second comparator, its in-phase input end connects the second end of the inductance in described main circuit; When described metal-oxide-semiconductor conducting, the first end current potential of the inductance in described main circuit is higher than its second terminal potential;
Described switch triggering and the anode of diode turned off in latching circuit connect the output of described second comparator, and its negative electrode connects the inverting input of described first comparator.
Wherein, described sample circuit is sampling resistor; The negative pole of the input voltage of main circuit described in one termination of described sampling resistor, the source electrode of metal-oxide-semiconductor described in its another termination.
Alternatively, described reference circuit also comprises diode; The anode of the diode in described reference circuit connects the output of described reference circuit, and its negative electrode connects pwm signal source, realizes PWM dimming function to make described pwm signal source by described constant-current control circuit.
Alternatively, described sample circuit also comprises diode; The negative electrode of the diode in described sample circuit connects the output of described sample circuit, and its anode connects pwm signal source, realizes PWM dimming function to make described pwm signal source by described constant-current control circuit.
Alternatively, described reference circuit also comprises resistance; Resistance one end in described reference circuit connects the output of described reference circuit, and the other end connects 0 ~ 10V signal source, realizes 0 ~ 10V dimming function to make described 0 ~ 10V signal source by described constant-current control circuit.
Alternatively, described sample circuit also comprises resistance; Resistance one end in described sample circuit connects the output of described sample circuit, and the other end connects 0 ~ 10V signal source, realizes 0 ~ 10V dimming function to make described 0 ~ 10V signal source by described constant-current control circuit.
A kind of constant current Buck converter, comprises main circuit and any one constant-current control circuit above-mentioned.
As can be seen from above-mentioned technical scheme, the utility model utilizes switch triggering and turns off latching circuit and detects inductance or diode both end voltage signal, in order to judge inductance energy release start/stop time, thus at inductance energy deenergized period (i.e. metal-oxide-semiconductor blocking interval) output from lock control signal to comparing drive circuit, control metal-oxide-semiconductor and turn off self-locking, complete rear to comparing drive circuit output conductivity control signal in inductance energy release, control metal-oxide-semiconductor conducting; Compared to prior art, the constant current output that the utility model achieves the critical conduction mode of Buck converter controls, and avoids in degree of depth continuous mode the various problems existed.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 a is a kind of constant-current control circuit structural representation disclosed in the utility model embodiment;
Fig. 1 b is the utility model embodiment another constant-current control circuit structural representation disclosed;
Fig. 2 a is the utility model embodiment another constant-current control circuit structural representation disclosed;
Fig. 2 b is the utility model embodiment another constant-current control circuit structural representation disclosed;
Fig. 3 a is the utility model embodiment another constant-current control circuit structural representation disclosed;
Fig. 3 b is the utility model embodiment another constant-current control circuit structural representation disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
See Fig. 1 a-Fig. 1 b, the utility model embodiment discloses a kind of constant-current control circuit, be applied to the constant current Buck converter that main circuit adopts metal-oxide-semiconductor Q1 source ground, to avoid problem in degree of depth continuous mode, the problem includes: various problem, comprise switch triggering and turn off latching circuit 100, sample circuit 200, reference circuit 300 and compare drive circuit 400, wherein:
Switch triggering and shutoff latching circuit 100, for detecting inductance L 1 (as shown in Figure 1a) in described main circuit or diode D1 (as shown in Figure 1 b) both end voltage, when the voltage detected with it in metal-oxide-semiconductor Q1 conducting time voltage direction contrary time, to comparing drive circuit 400 output from lock control signal, otherwise, export conductivity control signal to comparing drive circuit 400;
Sample circuit 200, the current signal on the metal-oxide-semiconductor Q1 that samples, and output current sampled signal Vs is to comparing drive circuit 400;
Reference circuit 300, for comparing drive circuit 400 output current reference signal Vref;
Relatively drive circuit 400, for when judging that obtaining current sampling signal Vs is not less than current reference signal Vref, driven MOS pipe Q1 turns off; After receiving described self-locking control signal, shutoff self-locking is carried out to metal-oxide-semiconductor Q1; And after receiving described conductivity control signal, driven MOS pipe Q1 conducting.
Below, in conjunction with main circuit topological structure and the operation principle thereof of constant current Buck converter, the technical scheme described in the present embodiment is described in detail.
The main circuit of constant current Buck converter comprises metal-oxide-semiconductor Q1, diode D1, inductance L 1 and electric capacity C1, the wherein source ground of metal-oxide-semiconductor Q1.Herein " " with referring to the reference of constant current Buck converter input voltage.
The operation principle of described main circuit is following (for ease of describing, first remembers inductance L 1 and load end V
othis one end of being connected of negative pole be the first end of inductance L 1, its this one end be connected with the drain electrode of metal-oxide-semiconductor Q1 is the second end of inductance L 1):
When metal-oxide-semiconductor Q1 conducting, electric current is from power end V
inpositive pole export, flow back to power end V through the first end of electric capacity C1, inductance L 1, the second end of inductance L 1, the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1
innegative pole.In this process, inductance L 1 energy storage, its first end current potential is higher than the second terminal potential; Diode D1 ends, and its cathode potential is higher than anode potential.
When metal-oxide-semiconductor Q1 turns off, inductance L 1 starts afterflow, releases energy, and electric current flows out from the second end of inductance L 1, flows back to the first end of inductance L 1 through the anode of diode D1, the negative electrode of diode D1, electric capacity C1.Release energy period in inductance L 1, the first end current potential of inductance L 1 is lower than the second terminal potential; Diode D1 conducting, its cathode potential is lower than anode potential; In the inductance L 1 fault offset complete moment, on diode D1, electric current is zero, and inductance L 1 both end voltage declines until zero instantaneously, and the state of diode D1 becomes cathode potential higher than anode potential thereupon.
As can be seen here, in the moment of metal-oxide-semiconductor Q1 break-make, inductance L 1, diode D1 both end voltage are at once reverse, and when the inductance L 1 fault offset complete moment, diode D1 both end voltage is again reverse, and inductance L 1 both end voltage declines instantaneously until zero.The present embodiment, just based on this characteristic of inductance L 1 and diode D1, utilizes switch triggering and turns off latching circuit 100 and detect inductance L 1 or diode D1 both end voltage signal V
d, thus according to V
dthe change in direction judges the exergonic initial time of inductance L 1; During inductance L 1 fault offset, (i.e. metal-oxide-semiconductor Q1 blocking interval) is output from lock control signal to comparing drive circuit 400, controls metal-oxide-semiconductor Q1 and turns off self-locking; After inductance L 1 fault offset, exporting conductivity control signal to comparing drive circuit 400, controlling metal-oxide-semiconductor Q1 conducting.Compared to prior art, the present embodiment can detect the Parameters variation of the inductance L 1 of metal-oxide-semiconductor Q1 blocking interval in real time, and the constant current output achieving the critical conduction mode of Buck converter controls, thus avoids in degree of depth continuous mode the various problems existed.
Concrete, still see Fig. 1 a-Fig. 1 b, each comprising modules of described constant-current control circuit can adopt following topological structure to realize, but does not limit to.
1) sample circuit 200 can adopt sampling resistor Rs, a termination power end V of sampling resistor Rs
innegative pole, the source electrode of its another termination metal-oxide-semiconductor Q1.
2) compare drive circuit 400 and can adopt the first comparator U1; The in-phase input end of the first comparator U1 connects reference circuit 300, its anti-phase input termination sample circuit 200, and it exports the grid of termination metal-oxide-semiconductor Q1.
3) switch triggering and shutoff latching circuit 100 comprise diode D2 and the second comparator U2, wherein:
As shown in Figure 1a, the in-phase input end of the second comparator U2 connects the anode of diode D1, the negative electrode of its anti-phase input termination diode D1; The anode of diode D2 connects the output of the second comparator U2, and its negative electrode connects the inverting input of the first comparator U1.
Or, as shown in Figure 1 b, the first end of the anti-phase input termination inductance L 1 of the second comparator U2, its in-phase input end connects the second end of inductance L 1; The anode of diode D2 connects the output of the second comparator U2, and its negative electrode connects the inverting input of the first comparator U1.
First comparator U1 is in metal-oxide-semiconductor Q1 conduction period, and the reference signal Vref that the sampled signal Vs export sampling resistor Rs and reference circuit 300 export makes comparisons, and as Vs >=Vref, the first comparator U1 output low level or zero level, controls metal-oxide-semiconductor Q1 and turn off.Metal-oxide-semiconductor Q1 closes and has no progeny, inductance L 1 and diode D1 start afterflow, its both end voltage moment oppositely, no matter be now in fig 1 a or in Figure 1b, all meet the reverse input voltage of the second comparator U2 lower than homophase input voltage, therefore the second comparator U2 exports high level, and is exported to the inverting input of the first comparator U1 by diode D2, make the first comparator U1 maintain output low level or zero level state, achieve the shutoff self-locking of metal-oxide-semiconductor Q1.
When afterflow finish time, in inductance L 1 and diode D1, electric current is zero, inductance L 1 both end voltage starts to decline, along with the decline diode D1 both end voltage of inductance L 1 both end voltage is reverse, inductance L 1 both end voltage declines until zero, like this, in Fig. 1 a-Fig. 1 b, the normal phase input end voltage of the second comparator U2 is not higher than anti-phase input terminal voltage, make the second comparator U2 output low level or zero level, and then, the anti-phase input terminal voltage of the first comparator U1 is lower than normal phase input end voltage, the first comparator U1 is made to export high level, control metal-oxide-semiconductor Q1 conducting, thus the constant current output achieving the critical conduction mode of Buck converter controls, avoid in degree of depth continuous mode the various problems existed, and this programme drives simple, it is convenient, with low cost to control, and is applicable to high drive occasion.
Preferably, described constant current Buck converter also accepts PWM brightness adjustment control, in order to regulate and control the output current value of described constant current Buck converter.Two kinds of corresponding embodiments are respectively:
1) as shown in Figure 2 a, reference circuit 300 also comprises diode D3, wherein:
The anode of diode D3 connects the output of reference circuit 300, and its negative electrode connects pwm signal source, realizes PWM dimming function to make described pwm signal source by described constant-current control circuit.
2) as shown in Figure 2 b, sample circuit 200 also comprises diode D4, wherein:
The negative electrode of diode D4 connects the output of sample circuit 200, and its anode connects pwm signal source, realizes PWM dimming function to make described pwm signal source by described constant-current control circuit.
Or described constant current Buck converter also can accept 0 ~ 10V brightness adjustment control, in order to regulate and control the output current value of described constant current Buck converter.Two kinds of corresponding embodiments are respectively:
1) as shown in Figure 3 a, reference circuit 300 also comprises resistance R1, wherein:
Resistance R1 one end connects the output of reference circuit 300, and the other end connects 0 ~ 10V signal source, realizes 0 ~ 10V dimming function to make described 0 ~ 10V signal source by described constant-current control circuit.
2) as shown in Figure 3 b, sample circuit 200 also comprises resistance R2, wherein:
Resistance R2 one end connects the output of sample circuit 200, and the other end connects 0 ~ 10V signal source, realizes 0 ~ 10V dimming function to make described 0 ~ 10V signal source by described constant-current control circuit.
It should be noted that, above-mentioned preferred version can realize based on circuit topological structure shown in Fig. 1 a equally, and its principle is identical with the principle realized based on circuit topological structure shown in Fig. 1 b, repeats no more herein.
In addition, the utility model embodiment also discloses a kind of constant current Buck converter, comprises main circuit and any one constant-current control circuit above-mentioned.
In sum, the utility model utilizes switch triggering and turns off latching circuit and detects inductance or diode both end voltage signal, in order to judge inductance energy release start/stop time, thus at inductance energy deenergized period (i.e. metal-oxide-semiconductor blocking interval) output from lock control signal to comparing drive circuit, control metal-oxide-semiconductor and turn off self-locking, complete rear to comparing drive circuit output conductivity control signal in inductance energy release, control metal-oxide-semiconductor conducting; Compared to prior art, the constant current output that the utility model achieves the critical conduction mode of Buck converter controls, and avoids in degree of depth continuous mode the various problems existed.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a constant-current control circuit, is applied to the constant current Buck converter that main circuit adopts metal-oxide-semiconductor source ground, it is characterized in that, described constant-current control circuit comprises switch triggering and turns off latching circuit, sample circuit, reference circuit and compare drive circuit, wherein:
Described switch triggering and shutoff latching circuit, for detecting inductance in described main circuit or diode both end voltage, when the voltage detected with it in described metal-oxide-semiconductor conducting time voltage direction contrary time, to the described drive circuit that compares output from lock control signal, otherwise, export conductivity control signal to the described drive circuit that compares;
Described sample circuit, the current signal on described metal-oxide-semiconductor of sampling, and output current sampled signal compares drive circuit to described;
Described reference circuit, for comparing drive circuit output current reference signal to described;
Describedly comparing drive circuit, for when judging that obtaining described current sampling signal is not less than described current reference signal, driving described metal-oxide-semiconductor to turn off; Described metal-oxide-semiconductor closes has no progeny, and after receiving described self-locking control signal, carries out shutoff self-locking to described metal-oxide-semiconductor; And after receiving described conductivity control signal, drive described metal-oxide-semiconductor conducting.
2. constant-current control circuit according to claim 1, is characterized in that, the described drive circuit that compares is the first comparator; The in-phase input end of described first comparator connects described reference circuit, sample circuit described in its anti-phase input termination, and it exports the grid of metal-oxide-semiconductor described in termination.
3. constant-current control circuit according to claim 2, is characterized in that, described switch triggering and shutoff latching circuit comprise diode and the second comparator, wherein:
The in-phase input end of described second comparator connects the anode of the diode in described main circuit, the negative electrode of the diode in main circuit described in its anti-phase input termination;
Described switch triggering and the anode of diode turned off in latching circuit connect the output of described second comparator, and its negative electrode connects the inverting input of described first comparator.
4. constant-current control circuit according to claim 2, is characterized in that, described switch triggering and shutoff latching circuit comprise diode and the second comparator, wherein:
The first end of the inductance in main circuit described in the anti-phase input termination of described second comparator, its in-phase input end connects the second end of the inductance in described main circuit; When described metal-oxide-semiconductor conducting, the first end current potential of the inductance in described main circuit is higher than its second terminal potential;
Described switch triggering and the anode of diode turned off in latching circuit connect the output of described second comparator, and its negative electrode connects the inverting input of described first comparator.
5. constant-current control circuit according to claim 1, is characterized in that, described sample circuit is sampling resistor; The negative pole of the input voltage of main circuit described in one termination of described sampling resistor, the source electrode of metal-oxide-semiconductor described in its another termination.
6. the constant-current control circuit according to any one of claim 1-5, is characterized in that, described reference circuit also comprises diode; The anode of the diode in described reference circuit connects the output of described reference circuit, and its negative electrode connects pwm signal source, realizes PWM dimming function to make described pwm signal source by described constant-current control circuit.
7. the constant-current control circuit according to any one of claim 1-5, is characterized in that, described sample circuit also comprises diode; The negative electrode of the diode in described sample circuit connects the output of described sample circuit, and its anode connects pwm signal source, realizes PWM dimming function to make described pwm signal source by described constant-current control circuit.
8. the constant-current control circuit according to any one of claim 1-5, is characterized in that, described reference circuit also comprises resistance; Resistance one end in described reference circuit connects the output of described reference circuit, and the other end connects 0 ~ 10V signal source, realizes 0 ~ 10V dimming function to make described 0 ~ 10V signal source by described constant-current control circuit.
9. the constant-current control circuit according to any one of claim 1-5, is characterized in that, described sample circuit also comprises resistance; Resistance one end in described sample circuit connects the output of described sample circuit, and the other end connects 0 ~ 10V signal source, realizes 0 ~ 10V dimming function to make described 0 ~ 10V signal source by described constant-current control circuit.
10. a constant current Buck converter, is characterized in that, comprises the constant-current control circuit according to any one of main circuit and claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420823700.6U CN204271917U (en) | 2014-12-22 | 2014-12-22 | Constant current Buck converter and constant-current control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420823700.6U CN204271917U (en) | 2014-12-22 | 2014-12-22 | Constant current Buck converter and constant-current control circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN204271917U true CN204271917U (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420823700.6U Withdrawn - After Issue CN204271917U (en) | 2014-12-22 | 2014-12-22 | Constant current Buck converter and constant-current control circuit thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467422A (en) * | 2014-12-22 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Constant-current Buck converter and constant-current control circuit thereof |
| CN106327640A (en) * | 2016-08-26 | 2017-01-11 | 内蒙古晶新科技有限责任公司 | Electronic lock and the control circuit thereof |
| CN109149925A (en) * | 2018-09-21 | 2019-01-04 | 广东工业大学 | A kind of buck circuit |
-
2014
- 2014-12-22 CN CN201420823700.6U patent/CN204271917U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467422A (en) * | 2014-12-22 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Constant-current Buck converter and constant-current control circuit thereof |
| CN106327640A (en) * | 2016-08-26 | 2017-01-11 | 内蒙古晶新科技有限责任公司 | Electronic lock and the control circuit thereof |
| CN109149925A (en) * | 2018-09-21 | 2019-01-04 | 广东工业大学 | A kind of buck circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150415 Effective date of abandoning: 20170426 |
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| AV01 | Patent right actively abandoned |