CN103036429A - Synchronous boost converter - Google Patents
Synchronous boost converter Download PDFInfo
- Publication number
- CN103036429A CN103036429A CN 201210568373 CN201210568373A CN103036429A CN 103036429 A CN103036429 A CN 103036429A CN 201210568373 CN201210568373 CN 201210568373 CN 201210568373 A CN201210568373 A CN 201210568373A CN 103036429 A CN103036429 A CN 103036429A
- Authority
- CN
- China
- Prior art keywords
- terminal
- current
- coupled
- voltage
- lead
- 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.)
- Pending
Links
Images
Abstract
The invention provides a synchronous boost converter which solves the problem that ripples of currents flowing through an input inductor are large under a light-load state of an existing synchronous boost converter. The synchronous boost converter comprises an input port, an output port, a middle node, an input inductor, a first switch, a second switch, an output capacitor, a sampling resistor, an operational amplifier, a feedback assembly, a voltage comparator, a selective switch, a current comparator and a control and drive circuit. The synchronous boost converter can reduce the ripples of the currents flowing through the input inductor under the light-load state.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of synchronous pressure-boosting converter.
Background technology
Synchronous pressure-boosting converter is applied to usually when the required voltage occasion higher than the voltage of power supply.This synchronous pressure-boosting converter comprises input inductor L, the first switch S 1, second switch S2 and the output capacitor Co that couples as shown in Figure 1.Existing synchronous pressure-boosting converter 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 pressure-boosting converter 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 synchronous pressure-boosting 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 pressure-boosting converter, has solved existing synchronous pressure-boosting converter large problem of ripple under light condition.
Technical scheme of the present invention is achieved in that
A kind of synchronous pressure-boosting converter 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 switch is coupled in intermediate node and with reference between the ground; Second 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, and its lead-out terminal produces the inductive 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 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 voltage comparison signal; Selector switch, have the first terminal, the second terminal, the 3rd terminal and control terminal, its the first terminal couples the first current peak, and its second terminal couples the second current peak, 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 receiving inductance current sampling signal of operational amplifier, and its inverting input is coupled to the 3rd terminal of selector 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 double switch and drive signal, to control the break-make of the first switch and second 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, and wherein feedback voltage produces at the coupled in series Nodes of the first resistance and the second resistance.
Alternatively, when voltage comparison signal was high level, the 3rd terminal of selector switch was connected to its first terminal, so that the inverting input of current comparator receives the first current peak; When voltage comparison signal was low level, the 3rd terminal of selector switch was connected to its second terminal, so that the inverting input of current comparator receives the second current peak.
Alternatively, described the first current peak is greater than the second current peak.
Alternatively, described synchronous pressure-boosting converter further comprises: compensation condenser is coupled in the lead-out terminal of operational amplifier and with reference between the ground.
The invention has the beneficial effects as follows: can reduce the current ripples that flow through input inductor of synchronous pressure-boosting converter 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 pressure-boosting converter;
Fig. 2 is the electrical block diagram of a kind of synchronous pressure-boosting converter 100 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, synchronous pressure-boosting converter 100 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 switch 106 is coupled in intermediate node 103 and with reference between the ground; Second 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, and its lead-out terminal produces inductive 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 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 voltage comparison signal; Selector switch 112, have the first terminal, the second terminal, the 3rd terminal and control terminal, its the first terminal couples the first current peak Ilim1, and its second terminal couples the second current peak Ilim2, and its control terminal is coupled to the lead-out terminal receiver voltage comparison signal of voltage comparator 111; Current comparator 113, have in-phase input end, inverting input and lead-out terminal, its in-phase input end is coupled to the lead-out terminal receiving inductance current sampling signal Isen of operational amplifier 109, its inverting input is coupled to the 3rd terminal of selector switch 112, its lead-out terminal generation current comparison signal; Control and drive circuit 114 are coupled to the lead-out terminal received current comparison signal of current comparator 113, and based on the electric current comparison signal, produce double switch and drive signal, to control the break-make of the first switch 106 and second switch 107.
Preferably, described synchronous pressure-boosting converter 100 also comprises: compensation condenser 115 is coupled in the lead-out terminal of operational amplifier 109 and with reference between the ground.
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, and wherein feedback voltage Vfb produces at the series connection node place of the first resistance and the second resistance.
Preferably, when voltage comparison signal was high level, the 3rd terminal of selector switch 112 was connected to its first terminal, so that the inverting input of current comparator 113 receives the first current peak Ilim1; When voltage comparison signal was low level, the 3rd terminal of selector switch 112 was connected to its second terminal, so that the inverting input of current comparator 113 receives the second current peak Ilim2.
Preferably, the first current peak Ilim1 is greater than the second current peak Ilim2.
When the normal operation of synchronous pressure-boosting converter 100, when the first switch 106 is switched on, second switch 107 is disconnected, input voltage vin via input inductor 104, sampling resistor 105 and the first 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 inductive current sampled signal Isen of operational amplifier 109 outputs also begins to increase.When it increases to the signal of current comparator 113 inverting inputs, the electric current comparison signal trigging signal of current comparator 113 outputs.Accordingly, the two-way of control and drive circuit 114 outputs drives the signal trigging signal, so that the first switch 106 is disconnected, second switch 107 is switched on.Input voltage vin, input inductor 104, sampling resistor 105, second 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 synchronous pressure-boosting converter 100 is relatively heavier, output voltage V o less, then also less of feedback voltage Vfb.Feedback voltage Vfb is less than reference voltage Vref at this moment, and the voltage comparison signal of voltage comparator 111 outputs is high level.Then the 3rd terminal of selector switch 112 is connected to its first terminal, so that the inverting input of current comparator 113 receives the first current peak Ilim1.Namely under heavy condition, when the inductive current sampled signal reaches the first current peak Ilim1, the electric current comparison signal trigging signal of current comparator 113 output, so via behind control and the drive circuit 114 the first switch 106 is disconnected, with second switch 107 conductings.
When the load of synchronous pressure-boosting converter 100 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 reference voltage Vref at this moment, and the voltage comparison signal of voltage comparator 111 outputs is low level.Then the 3rd terminal of selector switch 112 is connected to its second terminal, so that the inverting input of current comparator 113 receives the second current peak Ilim2.Namely under light condition, when the inductive current sampled signal reaches the second current peak Ilim2, the electric current comparison signal trigging signal of current comparator 113 output, so via behind control and the drive circuit 114 the first switch 106 is disconnected, with second switch 107 conductings.
As previously mentioned, the first current peak Ilim1 is greater than the second current peak Ilim2, so that synchronous pressure-boosting converter 100 flows through input inductor under light condition current peak is less than flowing through the current peak of input inductor under its heavy condition, thereby reduced to flow through under its light condition the current ripples of input inductor.
Synchronous pressure-boosting converter 100 of the present invention has reduced synchronous pressure-boosting converter 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 (5)
1. a synchronous pressure-boosting converter 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 switch is coupled in intermediate node and with reference between the ground;
Second 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, and its lead-out terminal produces the inductive 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 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 voltage comparison signal;
Selector switch, have the first terminal, the second terminal, the 3rd terminal and control terminal, its the first terminal couples the first current peak, and its second terminal couples the second current peak, 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 receiving inductance current sampling signal of operational amplifier, and its inverting input is coupled to the 3rd terminal of selector 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 double switch and drive signal, to control the break-make of the first switch and second switch.
2. the synchronous pressure-boosting converter of peak current saltus step as claimed in claim 1 is characterized in that, wherein
When voltage comparison signal was high level, the 3rd terminal of selector switch was connected to its first terminal, so that the inverting input of current comparator receives the first current peak;
When voltage comparison signal was low level, the 3rd terminal of selector switch was connected to its second terminal, so that the inverting input of current comparator receives the second current peak.
3. the synchronous pressure-boosting converter of peak current saltus step as claimed in claim 1 is characterized in that, described the first current peak is greater than the second current peak.
4. the synchronous pressure-boosting converter of peak current saltus step 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, and wherein feedback voltage produces at the coupled in series Nodes of the first resistance and the second resistance.
5. the synchronous pressure-boosting converter of peak current saltus step as claimed in claim 1 is characterized in that, described synchronous pressure-boosting converter further comprises:
Compensation condenser is coupled in the lead-out terminal of operational amplifier and with reference between the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210568373 CN103036429A (en) | 2012-12-12 | 2012-12-12 | Synchronous boost converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210568373 CN103036429A (en) | 2012-12-12 | 2012-12-12 | Synchronous boost converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103036429A true CN103036429A (en) | 2013-04-10 |
Family
ID=48022998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210568373 Pending CN103036429A (en) | 2012-12-12 | 2012-12-12 | Synchronous boost converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103036429A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578772A (en) * | 2014-12-26 | 2015-04-29 | 福建联迪商用设备有限公司 | Boosting circuit |
| 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 |
| CN105529805A (en) * | 2015-12-25 | 2016-04-27 | 青岛海特新蓝生物科技有限公司 | Diversified power generation system |
| CN105606190A (en) * | 2015-12-25 | 2016-05-25 | 青岛讯达捷电子科技有限公司 | Measuring instrument |
| CN105790405A (en) * | 2015-12-26 | 2016-07-20 | 青岛讯达捷电子科技有限公司 | Various new energy sources combined power generation device |
| CN106602851A (en) * | 2017-01-11 | 2017-04-26 | 哈尔滨工业大学深圳研究生院 | Low frequency pulse current ripple inhibition circuit suitable for pulse load |
| CN111262435A (en) * | 2020-03-11 | 2020-06-09 | 昌芯(西安)集成电路科技有限责任公司 | Control circuit and control method of four-switch buck-boost converter |
| CN111432523A (en) * | 2020-03-19 | 2020-07-17 | 深圳市崧盛电子股份有限公司 | BUCK constant current control circuit with input voltage changing along with output voltage and power supply |
| WO2023134343A1 (en) * | 2022-01-14 | 2023-07-20 | Goodix Technology (Hk) Company Limited | Current limit control circuit for boost converter in ccm |
-
2012
- 2012-12-12 CN CN 201210568373 patent/CN103036429A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578772A (en) * | 2014-12-26 | 2015-04-29 | 福建联迪商用设备有限公司 | Boosting circuit |
| CN105529805A (en) * | 2015-12-25 | 2016-04-27 | 青岛海特新蓝生物科技有限公司 | Diversified power generation system |
| CN105606190A (en) * | 2015-12-25 | 2016-05-25 | 青岛讯达捷电子科技有限公司 | Measuring instrument |
| CN105790405A (en) * | 2015-12-26 | 2016-07-20 | 青岛讯达捷电子科技有限公司 | Various new energy sources combined power generation device |
| 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 |
| CN106602851A (en) * | 2017-01-11 | 2017-04-26 | 哈尔滨工业大学深圳研究生院 | Low frequency pulse current ripple inhibition circuit suitable for pulse load |
| CN106602851B (en) * | 2017-01-11 | 2019-09-27 | 哈尔滨工业大学深圳研究生院 | A kind of low frequency pulse current ripple suppression circuit suitable for pulse load |
| CN111262435A (en) * | 2020-03-11 | 2020-06-09 | 昌芯(西安)集成电路科技有限责任公司 | Control circuit and control method of four-switch buck-boost converter |
| CN111262435B (en) * | 2020-03-11 | 2023-06-23 | 昌芯(西安)集成电路科技有限责任公司 | Control circuit and control method of four-switch buck-boost converter |
| CN111432523A (en) * | 2020-03-19 | 2020-07-17 | 深圳市崧盛电子股份有限公司 | BUCK constant current control circuit with input voltage changing along with output voltage and power supply |
| CN111432523B (en) * | 2020-03-19 | 2021-09-28 | 深圳市崧盛电子股份有限公司 | BUCK constant current control circuit with input voltage changing along with output voltage and power supply |
| WO2023134343A1 (en) * | 2022-01-14 | 2023-07-20 | Goodix Technology (Hk) Company Limited | Current limit control circuit for boost converter in ccm |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103036426A (en) | Peak current gradient synchronous booster circuit | |
| CN103036429A (en) | Synchronous boost converter | |
| CN103036428A (en) | Peak current gradient synchronous step-down circuit | |
| CN103036427A (en) | Synchronous buck converter | |
| CN101728954B (en) | Control circuit for DC-DC converter and method thereof | |
| KR101845337B1 (en) | Single-inductor positive and negative voltage output device | |
| CN103051217A (en) | Flyback converter with gradually changing peak current | |
| CN103051218A (en) | Flyback converter | |
| CN104980024A (en) | Current equalizing circuit and control method thereof | |
| CN107026568B (en) | Control circuit, control method and switching power supply | |
| CN103095129A (en) | Switch frequency hopping synchronous voltage reduction circuit | |
| CN105811761B (en) | A kind of BOOST circuit of current sampling circuit and integrated current sample circuit | |
| CN103051178A (en) | Buck converter for detecting and stopping reverse current | |
| CN102810984A (en) | Switching power circuit | |
| CN104991597A (en) | Peak current control circuit | |
| CN103078496A (en) | Voltage reduction circuit | |
| CN103051216A (en) | Flyback-type switch circuit | |
| CN103647448B (en) | Integrated step-down-flyback type high power factor constant current circuit and device | |
| CN105024545A (en) | Switch control method, ON-OFF control circuit and modulator | |
| CN105244970A (en) | Charging circuit | |
| CN103078512A (en) | Flyback switch circuit of switch frequency hopping | |
| CN104716836A (en) | Control circuit and method for switching power converter | |
| CN104601015B (en) | Inverse-excitation type AC DC converters | |
| CN105099179A (en) | System for improving transient response of power supply circuit | |
| CN203617902U (en) | Integrated buck-flyback type high power factor constant current circuit and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Lianmeng Electronic Instrument Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130410 |