CN103036426A - Peak current gradient synchronous booster circuit - Google Patents
Peak current gradient synchronous booster circuit Download PDFInfo
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- CN103036426A CN103036426A CN 201210564338 CN201210564338A CN103036426A CN 103036426 A CN103036426 A CN 103036426A CN 201210564338 CN201210564338 CN 201210564338 CN 201210564338 A CN201210564338 A CN 201210564338A CN 103036426 A CN103036426 A CN 103036426A
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Abstract
The invention provides a peak current gradient synchronous booster circuit and solves the problem that a synchronous booster circuit in the prior art is large in current ripple flowing into an input inductor under the state of light load. The peak current gradient synchronous booster circuit comprises an input port, an output port, a first power switch, a second power switch, an output inductor, an input capacitor, a sampling resistor, a operational amplifier, a feedback unit, a voltage comparator, a error amplifier, a clamper, a first logic switch, a second logic switch, a current comparator and a control/drive circuit. The peak current gradient synchronous booster circuit can reduce the current ripple flowing into the input inductor under the state of light load.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of synchronous voltage booster circuit of peak current gradual change.
Background technology
Synchronous voltage booster circuit is applied to usually when the required voltage occasion higher than the voltage of power supply.This synchronous voltage booster circuit comprises input inductor L, the first power switch S1, the second power switch S2 and the output capacitor Co that couples as shown in the figure.Existing synchronous voltage booster circuit adopts peak-current mode control usually, makes the current peak that flows through input inductor be adjusted to a constant peak.Yet use this control mode, no matter synchronous voltage booster circuit is in heavy condition or light condition, and the current peak that flows through input inductor all is adjusted to same peak value.So that converter flows through the current ripples of input inductor under light condition very large.
Summary of the invention
The present invention proposes a kind of synchronous voltage booster circuit of peak current gradual change, has solved existing synchronous voltage booster circuit large problem of ripple under light condition.
Technical scheme of the present invention is achieved in that
A kind of synchronous voltage booster circuit of peak current gradual change comprises: input port receives input voltage; Output port provides output voltage; Intermediate node; Input inductor and sampling resistor are coupled in series between input port and the intermediate node; The first power switch is coupled in intermediate node and with reference between the ground; The second power switch is coupled between intermediate node and the output port; Output capacitor is coupled in output port and with reference between the ground; Operational amplifier has first input end, the second input terminal and lead-out terminal, and its first input end and the second input terminal are connected across the sampling resistor two ends, its lead-out terminal generation current sampled signal; Feedback component is coupled to output port and receives output voltage, and produces the feedback voltage of reflection output voltage; Voltage comparator has in-phase input end, inverting input and lead-out terminal, and its inverting input threshold level voltage, its in-phase input end are coupled to feedback component and receive feedback voltage, and its lead-out terminal produces voltage comparison signal; Error comparator has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives reference voltage, and its inverting input is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces error amplification signal; Clamper is coupled in the lead-out terminal of error amplifier and with reference between the ground; The first logic switch has the first terminal, the second terminal and control terminal, and the lead-out terminal that its first terminal is coupled to error amplifier receives error amplification signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator; The second logic switch has the first terminal, the second terminal and control terminal, and its first terminal couples current peak signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator; Current comparator, have in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal received current sampled signal of operational amplifier, its inverting input is coupled to the second terminal of the first logic switch and the second terminal of the second logic switch, its lead-out terminal generation current comparison signal; Control and drive circuit are coupled to the lead-out terminal received current comparison signal of current comparator, and based on the electric current comparison signal, produce the two-way power switch and drive signal, to control the break-make of the first power switch and the second power switch.
Alternatively, described feedback component comprises and is coupled in series in output port and with reference to the first resistance between the ground and the second resistance that wherein feedback voltage produces at the coupled in series Nodes of the first resistance and the second resistance.
Alternatively, described the first logic switch is the high level conducting, and the second logic switch is the low level conducting.
Alternatively, described clamper comprises Zener diode.
Alternatively, described synchronous voltage booster circuit further comprises: the first compensation condenser is coupled in the lead-out terminal of operational amplifier and with reference between the ground.
Alternatively, described synchronous voltage booster circuit further comprises: the second compensation condenser is coupled between the lead-out terminal and inverting input of error amplifier.
The invention has the beneficial effects as follows: can reduce the current ripples that flow through input inductor of synchronous voltage booster circuit under light condition.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the typical circuit structural representation of existing synchronous voltage booster circuit;
Fig. 2 is the electrical block diagram of the synchronous voltage booster circuit 100 of a kind of peak current gradual change of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not paying the every other embodiment that obtains under the creative work prerequisite.
As shown in Figure 2, the synchronous voltage booster circuit 100 of peak current gradual change of the present invention comprises: input port 101 receives input voltage vin; Output port 102 provides output voltage V o; Intermediate node 103; Input inductor 104 and sampling resistor 105 are coupled in series between input port 101 and the intermediate node 103; The first power switch 106 is coupled in intermediate node 103 and with reference between the ground; The second power switch 107 is coupled between intermediate node 103 and the output port 102; Output capacitor 108 is coupled in output port 102 and with reference between the ground; Operational amplifier 109 has first input end, the second input terminal and lead-out terminal, and its first input end and the second input terminal are connected across sampling resistor 105 two ends, its lead-out terminal generation current sampled signal Isen; Feedback component 110 is coupled to output port 102 and receives output voltage V o, and produces the feedback voltage Vfb of reflection output voltage V o; Voltage comparator 111 has in-phase input end, inverting input and lead-out terminal, and its inverting input threshold level voltage Vth, its in-phase input end are coupled to feedback component 110 and receive feedback voltage Vfb, and its lead-out terminal produces voltage comparison signal; Error comparator 119 has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives reference voltage Vref, and its inverting input is coupled to feedback component 110 and receives feedback voltage Vfb, and its lead-out terminal produces error amplification signal Vc; Clamper 112 is coupled in the lead-out terminal of error amplifier 119 and with reference between the ground; The first logic switch 113, have the first terminal, the second terminal and control terminal, the lead-out terminal that its first terminal is coupled to error amplifier 119 receives error amplification signal Vc, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator 111; The second logic switch 114 has the first terminal, the second terminal and control terminal, and its first terminal couples current peak signal Ilim, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator 111; Current comparator 115, have in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal received current sampled signal Isen of operational amplifier 109, its inverting input is coupled to the second terminal of the first logic switch 113 and the second terminal of the second logic switch 114, its lead-out terminal generation current comparison signal; Control and drive circuit 116 are coupled to the lead-out terminal received current comparison signal of current comparator 115, and based on the electric current comparison signal, produce the two-way power switch and drive signal, to control the break-make of the first power switch 106 and the second power switch 107.
Preferably, the synchronous voltage booster circuit 100 of described peak current gradual change also comprises: the first compensation condenser 117 is coupled in the lead-out terminal of operational amplifier 109 and with reference between the ground.
Preferably, the synchronous voltage booster circuit 100 of described peak current gradual change also comprises: the second compensation condenser 118 is coupled between the lead-out terminal and inverting input of error amplifier 119.
Preferably, feedback component 110 comprises and is coupled in series in output port 102 and with reference to the first resistance between the ground and the second resistance that wherein feedback voltage Vfb produces at the series connection node place of the first resistance and the second resistance.
Preferably, clamper 112 comprises Zener diode, and has clamping voltage Vz.
Preferably, the first logic switch 113 is the high level conducting, and the second logic switch 114 is the low level conducting.That is to say, when feedback voltage Vfb during greater than threshold voltage Vth, voltage comparison signal is high level, this moment the first logic switch 113 be switched on, the second logic switch 114 is disconnected, and receives error amplification signal Vc so that the inverting input of current comparator 115 receives the lead-out terminal that is coupled to error comparator 119; When feedback voltage Vfb during less than threshold voltage Vth, voltage comparison signal is low level, this moment the first logic switch 113 be disconnected, the second logic switch 114 is switched on, so that the inverting input received current peak signal Ilim of current comparator 115.
When the normal operation of synchronous voltage booster circuit 100 of peak current gradual change, when the first power switch 106 is switched on, the second power switch 107 is disconnected, input voltage vin via input inductor 104, sampling resistor 105 and the first power switch 106 to reference to ground.Input inductor 104 begins storage power at this moment, and the electric current that flows through input inductor 104 is the electric current that flows through sampling resistor 105.This electric current begins to increase.Then the current sampling signal Isen of operational amplifier 109 outputs also begins to increase.When it increases to the signal of current comparator 115 inverting inputs, the electric current comparison signal trigging signal of current comparator 115 outputs.Accordingly, the two-way of control and drive circuit 116 outputs drives the signal trigging signal, so that the first power switch 106 is disconnected, the second power switch 107 is switched on.Input voltage vin, input inductor 104, sampling resistor 105, the second power switch 107 and output capacitor 108 form current path subsequently.The energy of input voltage vin and input inductor 104 storages is transmitted and is converted into output voltage V o.
When the load of the synchronous voltage booster circuit 100 of peak current gradual change is relatively heavier, output voltage V o less, then also less of feedback voltage Vfb.Feedback voltage Vfb is less than threshold voltage Vth at this moment, and the voltage comparison signal of voltage comparator 111 outputs is high level.Then the first logic switch 113 is disconnected, the second logic switch 114 is switched on, so that the inverting input received current peak signal Ilim of current comparator 115.Namely under heavy condition, when current sampling signal reaches current peak signal Ilim, the electric current comparison signal trigging signal of current comparator 115 output, so via behind control and the drive circuit 116 the first power switch 106 is disconnected, with 107 conductings of the second power switch.
When the load of the synchronous voltage booster circuit 100 of peak current gradual change was relatively light, output voltage V o was relatively large, and then feedback voltage Vfb is also relatively large.Feedback voltage Vfb is greater than threshold voltage Vth at this moment, and the voltage comparison signal of voltage comparator 111 outputs is low level.Then the first logic switch 113 is switched on, the second logic switch 114 is disconnected, so that the inverting input of current comparator 115 receives error amplification signal Vc.Namely under light condition, when current sampling signal Isen reaches error amplification signal Vc, the electric current comparison signal trigging signal of current comparator 115 output, so via behind control and the drive circuit 116 the first power switch 106 is disconnected, with 107 conductings of the second power switch.And error amplification signal Vc is the integration of feedback voltage Vfb and reference voltage Vref difference.This error amplification signal Vc slowly changes along with the variation of feedback voltage Vfb.When feedback voltage Vfb slowly increases, it is large that error amplification signal Vc also slowly becomes.When it increased to the clamping voltage Vz of clamper 112, error amplification signal Vc was clamped at clamping voltage Vz place.
Therefore, the synchronous voltage booster circuit 100 of peak current gradual change is under light condition, and its inductive current peak slowly changes, and its maximum is clamped at clamping voltage Vz place, thereby has reduced the inductive current ripple under its light condition.
The synchronous voltage booster circuit 100 of peak current gradual change of the present invention has reduced synchronous voltage booster circuit flows through input inductor under light condition current ripples.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the synchronous voltage booster circuit of a peak current gradual change is characterized in that, comprising:
Input port receives input voltage;
Output port provides output voltage;
Intermediate node;
Input inductor and sampling resistor are coupled in series between input port and the intermediate node;
The first power switch is coupled in intermediate node and with reference between the ground;
The second power switch is coupled between intermediate node and the output port;
Output capacitor is coupled in output port and with reference between the ground;
Operational amplifier has first input end, the second input terminal and lead-out terminal, and its first input end and the second input terminal are connected across the sampling resistor two ends, its lead-out terminal generation current sampled signal;
Feedback component is coupled to output port and receives output voltage, and produces the feedback voltage of reflection output voltage;
Voltage comparator has in-phase input end, inverting input and lead-out terminal, and its inverting input threshold level voltage, its in-phase input end are coupled to feedback component and receive feedback voltage, and its lead-out terminal produces voltage comparison signal;
Error comparator has in-phase input end, inverting input and lead-out terminal, and its in-phase input end receives reference voltage, and its inverting input is coupled to feedback component and receives feedback voltage, and its lead-out terminal produces error amplification signal;
Clamper is coupled in the lead-out terminal of error amplifier and with reference between the ground;
The first logic switch has the first terminal, the second terminal and control terminal, and the lead-out terminal that its first terminal is coupled to error amplifier receives error amplification signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator;
The second logic switch has the first terminal, the second terminal and control terminal, and its first terminal couples current peak signal, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator;
Current comparator, have in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal received current sampled signal of operational amplifier, its inverting input is coupled to the second terminal of the first logic switch and the second terminal of the second logic switch, its lead-out terminal generation current comparison signal;
Control and drive circuit are coupled to the lead-out terminal received current comparison signal of current comparator, and based on the electric current comparison signal, produce the two-way power switch and drive signal, to control the break-make of the first power switch and the second power switch.
2. the synchronous voltage booster circuit of peak current gradual change as claimed in claim 1 is characterized in that, also comprises:
The first compensation condenser is coupled in the lead-out terminal of operational amplifier and with reference between the ground.
3. the synchronous voltage booster circuit of peak current gradual change as claimed in claim 1 is characterized in that, also comprises: the second compensation condenser is coupled between the lead-out terminal and inverting input of error amplifier.
4. the synchronous voltage booster circuit of peak current gradual change as claimed in claim 1, it is characterized in that, described feedback component comprises and is coupled in series in output port and with reference to the first resistance between the ground and the second resistance that wherein feedback voltage produces at the coupled in series Nodes of the first resistance and the second resistance.
5. the synchronous voltage booster circuit of peak current gradual change as claimed in claim 1 is characterized in that, described clamper comprises Zener diode.
6. the synchronous buck circuit of peak current gradual change as claimed in claim 1 is characterized in that, wherein said the first logic switch is the high level conducting, and the second logic switch is the low level conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210564338 CN103036426A (en) | 2012-12-11 | 2012-12-11 | Peak current gradient synchronous booster circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210564338 CN103036426A (en) | 2012-12-11 | 2012-12-11 | Peak current gradient synchronous booster circuit |
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| CN103036426A true CN103036426A (en) | 2013-04-10 |
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| CN 201210564338 Pending CN103036426A (en) | 2012-12-11 | 2012-12-11 | Peak current gradient synchronous booster circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944386A (en) * | 2014-04-30 | 2014-07-23 | 常州信息职业技术学院 | DC-DC boost conversion device and boost conversion working method thereof |
| CN105429455A (en) * | 2015-11-12 | 2016-03-23 | 成都芯源系统有限公司 | DC converter and control circuit and method thereof |
| CN105433795A (en) * | 2015-12-25 | 2016-03-30 | 青岛朝阳华泰管理咨询服务有限公司 | Milk powder preparing machine |
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2012
- 2012-12-11 CN CN 201210564338 patent/CN103036426A/en active Pending
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| CN103944386A (en) * | 2014-04-30 | 2014-07-23 | 常州信息职业技术学院 | DC-DC boost conversion device and boost conversion working method thereof |
| CN105429455A (en) * | 2015-11-12 | 2016-03-23 | 成都芯源系统有限公司 | DC converter and control circuit and method thereof |
| CN105429455B (en) * | 2015-11-12 | 2018-12-11 | 成都芯源系统有限公司 | DC converter and control circuit and method thereof |
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| CN105433795A (en) * | 2015-12-25 | 2016-03-30 | 青岛朝阳华泰管理咨询服务有限公司 | Milk powder preparing machine |
| CN105449817A (en) * | 2015-12-25 | 2016-03-30 | 青岛朝阳华泰管理咨询服务有限公司 | Power generation equipment |
| CN105554668A (en) * | 2015-12-25 | 2016-05-04 | 青岛北斗星云通信科技有限公司 | Hearing impairment assist device |
| CN105509859A (en) * | 2015-12-25 | 2016-04-20 | 青岛北斗星云通信科技有限公司 | Electronic scale for supermarket |
| CN105527000A (en) * | 2015-12-25 | 2016-04-27 | 青岛北斗星云通信科技有限公司 | Electronic scale for supermarkets |
| CN105790410A (en) * | 2015-12-26 | 2016-07-20 | 青岛讯达捷电子科技有限公司 | Island power generation station |
| CN105491498A (en) * | 2015-12-28 | 2016-04-13 | 青岛玻莱莫斯新材料技术有限公司 | Hearing assistance instrument |
| CN105491499A (en) * | 2015-12-28 | 2016-04-13 | 青岛玻莱莫斯新材料技术有限公司 | Elderly hearing aid |
| CN105491501A (en) * | 2015-12-30 | 2016-04-13 | 青岛玻莱莫斯新材料技术有限公司 | Portable electronic hearing aid |
| CN105790580A (en) * | 2016-05-11 | 2016-07-20 | 深圳市华星光电技术有限公司 | Power source system and inductive current peak control method |
| CN105790580B (en) * | 2016-05-11 | 2018-05-01 | 深圳市华星光电技术有限公司 | The control method of power-supply system and inductive current peak |
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Addressee: Lianmeng Electronic Instrument Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130410 |