CN105099183A - Self-adaptive boost charging circuit used for switching power supply converter - Google Patents
Self-adaptive boost charging circuit used for switching power supply converter Download PDFInfo
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- CN105099183A CN105099183A CN201410153346.5A CN201410153346A CN105099183A CN 105099183 A CN105099183 A CN 105099183A CN 201410153346 A CN201410153346 A CN 201410153346A CN 105099183 A CN105099183 A CN 105099183A
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Abstract
The invention relates to the field of electronic technologies, and particularly relates to a boost charging circuit. The self-adaptive boost charging circuit used for a switching power supply converter comprises a subtraction unit and a power stage. The subtraction unit comprises a first input end and a second input end, wherein the first input end is connected with a switching node end of the switching power supply converter, and the second input end is connected to a bootstrap end of the switching power supply converter so as to act as a feedback input end. The subtraction unit is used for carrying out a subtraction operation on voltage of the switching node end and the bootstrap end and then provides the voltage for the bootstrap end. The power stage is connected between the subtraction unit and the bootstrap end, and the output end of the power stage is connected with the bootstrap end. The self-adaptive boost charging circuit provided by the invention is simple in structure, can carry out real-time detection on difference of power supply voltage ends of a first driving circuit of the switching power supply converter so as to drive conduction of a switching tube M1 and realize effective control and protection for a switching power supply.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of boost charge circuit.
Background technology
For the Switching Power Supply conversion chip of high pressure or big current, because the conducting resistance of N-channel MOS pipe is less, generally about 1/3rd of P channel MOS tube, adopt the chip of N-channel MOS pipe can take less area than employing P channel MOS tube, there is less conduction loss, thus usually adopt N-channel MOS pipe as the switching device of switch power converter.
When N-channel MOS pipe needs the voltage drop Vgs between grid and source electrode to be greater than a threshold voltage, just meeting conducting, the existence of threshold voltage can produce larger power consumption; As shown in Figure 1, for the topology of upper and lower Guan Doushi N pipe, bootstrap circuit boost is set usually to allow the threshold voltage of pipe, the pressure drop of power end VDD to switching node SW can not be had influence on; Arrange an electric capacity C2 especially by between BS end and switching node SW, a 5V supply voltage is charged to electric capacity C2 by diode D1, and BS end provides the high terminal voltage needed for drive circuit.Ideally, instantly during pipe M2 conducting, switching node SW is in no-voltage, and 5V supply voltage is by diode D1 to electric capacity C2 quick charge, and the voltage making electric capacity C2 two ends is+5V, and now BS terminal voltage is+5V; When upper pipe M2 conducting, SW terminal voltage can be increased to input voltage VDD by no-voltage, because the voltage at electric capacity two ends can not suddenly change, at this moment BS voltage is 5V+VDD, but when under light-load mode, upper pipe M1 and lower pipe M2 turns off, switching node SW is suspended state, and now switching node SW is approximately equal to output end voltage Vout, make do not have pressure drop between the grid of upper pipe M1 during underloading and source electrode, booster circuit is inoperative; Or instantly during pipe M2 conducting, if switching node SW is negative value, BS terminal voltage then may be higher, circuit can be made to present not controlled state under above-mentioned circuit environment, affects the normal work of circuit.
Summary of the invention
The object of the invention is to, a kind of self adaptation boost charge circuit for switch power converter is provided, solves above technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
For the self adaptation boost charge circuit of switch power converter, it is characterized in that, comprise,
One subtrator, described subtrator comprises,
One first input end, connects the switching node end of a switch power converter,
One second input, connects the Bootstrap end of described switch power converter as feedback input end,
Described subtrator is supplied to described Bootstrap end after carrying out subtraction to the voltage of described switching node end and described Bootstrap end;
One power stage, is connected between described subtrator and described Bootstrap end, and the output of described power stage connects described Bootstrap end.
Preferably, described subtrator comprises an operational amplifier, and described first input end connects the inverting input of described operational amplifier by one the 4th resistance.
Preferably, the inverting input of described operational amplifier connects a reference voltage by one the 3rd resistance.
Preferably, the in-phase input end of described operational amplifier and one second resistance that the circuit between described second input is connected.
Preferably, the in-phase input end of described operational amplifier connects earth terminal by one first resistance.
Preferably, to connect between described second input with described Bootstrap end one the 5th resistance.
Preferably, described first resistance is equal with the resistance of described 3rd resistance, and described second resistance is equal with the resistance of described 4th resistance.
Preferably, the resistance of described second resistance is m times of described first resistance, and wherein the span of m is 1 to 10 times.
Preferably, described power stage comprises a field effect transistor, and the source electrode of described field effect transistor connects an input supply voltage end, the anode of drain series one diode of described field effect transistor, and the negative electrode of described diode connects described second input.
Preferably, described reference voltage is equal with the reference voltage that the input of the error amplifier of described switch power converter provides.
Beneficial effect: owing to adopting above technical scheme; structure of the present invention is simple; difference between first drive circuitry voltage of switch power converter can be detected in real time, with the conducting of driving switch pipe M1, realize the effective control and protection of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art;
Fig. 2 is electrical block diagram of the present invention;
Fig. 3 is a kind of realizing circuit figure of operational amplification circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 2, Fig. 3, for the self adaptation boost charge circuit of switch power converter, wherein, comprise,
One subtrator 21, subtrator 21 comprises,
One first input end, the switching node end of connecting valve power supply changeover device, switching node end leads to
Conventional SW end represents;
One second input, the Bootstrap end of connecting valve power supply changeover device as feedback input end, from
Lifting pressure side represents with BOOT end or BS end usually;
Subtrator 21 is supplied to BOOT end after carrying out subtraction to the voltage of SW end and BOOT end;
One power stage 22; Be connected between subtrator 21 and BOOT hold, the output of power stage 22 connects BOOT end.
As one of the present invention preferably embodiment, subtrator 21 comprises an operational amplifier 211, and first input end is by the inverting input (-) of one the 4th resistance R4 concatenation operation amplifier 211.。
As one of the present invention preferably embodiment, the inverting input (-) of operational amplifier 211 connects a reference voltage Vref by one the 3rd resistance R3.
As one of the present invention preferably embodiment, in-phase input end (+) and the second resistance R2 that the circuit between the second input is connected of operational amplifier 211.
As one of the present invention preferably embodiment, the in-phase input end (+) of operational amplifier connects earth terminal PGND by one first resistance R1.
As one of the present invention preferably embodiment, the second input is connected between holding with BOOT one the 5th resistance R5.
As one of the present invention preferably embodiment, the first resistance R1 is equal with the resistance of the 3rd resistance R3, and the second resistance R2 is equal with the resistance of the 4th resistance R4.
As one of the present invention preferably embodiment, the resistance of the second resistance R2 is m times of the first resistance R1 resistance, and wherein the span of m is 1 to 10 times.When the value of reference voltage is 0.923V, the value of m is 5 to 6 times.
As a kind of preferred embodiment of the present invention, power stage 22 comprises a field effect transistor 221, and the source electrode of field effect transistor 221 connects Input voltage terminal IN, and the anode of drain series one diode 222 of field effect transistor 221, the negative electrode of diode 222 connects the second input.
As one of the present invention preferably embodiment, reference voltage Vref is equal with the reference voltage that the input of the error amplifier of switch power converter provides.
A kind of specific embodiment, switch power converter is BUCK chip, as shown in Figure 2,
Comprise,
One Input voltage terminal IN,
One SW end,
One earth terminal GND,
One first switching device M1, is arranged on the circuit between Input voltage terminal IN and SW end;
One second switch device M2, is arranged on the circuit between SW end and earth terminal GND;
One first drive circuit 1, connects BOOT end and SW end, the control end of voltage to the first switching device M1 providing BOOT to hold under the effect of a pulse-width signal or the control end of SW terminal voltage to the first switching device M1;
The element circuit 2 that one subtrator 21 and power stage 22 form, be supplied to BOOT end after carrying out computing to the voltage of BOOT end, SW end, in the chip exterior of switch power converter, Bootstrap end SW and SW connects a charging capacitor between holding.
Structure of the present invention is simple, can detect in real time, with the conducting of driving switch pipe M1, realize the effective control and protection of Switching Power Supply the difference between the first drive circuitry voltage.
As a kind of preferred embodiment of the present invention, first switching device M1 and second switch device M2 adopts N to link up metal-oxide-semiconductor, the drain electrode of the first switching device M1 connects Input voltage terminal IN, the source electrode of the first switching device M1 connects SW end, and the grid of the first switching device M1 connects the signal output part of the first drive circuit 1; The drain electrode of second switch device M2 connects SW end, and the source electrode of second switch device M2 connects earth terminal GND.
As a kind of preferred embodiment of the present invention, pulse-width signal is produced by a control circuit, and control circuit comprises,
One error amplifier 3, in order to compare a voltage feedback signal FB and reference voltage, obtains an error amplification signal;
One comparator 4, in order to compare a current detection signal and error amplification signal, produces a comparison signal;
One oscillator 5, for generation of clock signal;
One rest-set flip-flop 6, for producing pulse-width signal according to comparison signal and clock signal.The Q of rest-set flip-flop 6 holds connection first drive circuit 1, and the Q negative terminal of rest-set flip-flop 6 connects a buffer 7, and the signal output part of buffer 7 connects the control end of second switch device M2.
What will control due to final control signal is high-power switch tube, and the general W/L of power tube is larger, its parasitic capacitance is also relatively large, when switching frequency is higher, larger drive current is needed to carry out driving power pipe, therefore, switch controlling signal needs certain drive circuit to strengthen the driving force of signal.
As a kind of preferred embodiment of the present invention, oscillator 5 also for exporting a slope compensation signal, for carrying out slope compensation to current detection signal.Particularly, arrange accumulator 11 slope compensation signal and current detection signal are added up.Signal input comparator 4 after cumulative is to compare generation comparison signal with error amplification signal.
As a kind of preferred embodiment of the present invention, the feedback network that voltage feedback signal FB is drawn by an output realizes.Feedback network is connected between SW end and earth terminal GND.
As a kind of preferred embodiment of the present invention, current detection signal is realized by a current detecting branch road, current detecting branch road comprises a detection resistance, on series connection and circuit between Input voltage terminal and the first switching device M1, the two ends detecting resistance connect a differential amplifier 8, respectively for generation of current detection signal.
As a kind of preferred embodiment of the present invention, control circuit also comprises an oscillator 5, for generation of pulse signal, and selectively works in high-frequency output mode or low frequency output mode according to voltage feedback signal.Compare especially by by the reference voltage of voltage feedback signal FB and a 0.3V, when voltage feedback signal FB is lower than 0.3V, oscillator 5 works in low frequency output mode, and when voltage feedback signal FB is higher than 0.3V, oscillator 5 works in high-frequency output mode.
As a kind of preferred embodiment of the present invention, the present invention also comprises soft starting circuit 9, the output of soft starting circuit 9 connects error amplifier 3, for when the input of circuit powers on, make the slow lifting of the output voltage of error amplifier 3, allow system progress into stable operating state, once system starts, soft starting circuit will no longer be had an effect.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilizations specification of the present invention and diagramatic content and apparent change obtain in protection scope of the present invention.
Claims (10)
1., for the self adaptation boost charge circuit of switch power converter, it is characterized in that, comprise,
One subtrator, described subtrator comprises,
One first input end, connects the switching node end of a switch power converter,
One second input, connects the Bootstrap end of described switch power converter as feedback input end,
Described subtrator is supplied to described Bootstrap end after carrying out subtraction to the voltage of described switching node end and described Bootstrap end;
One power stage, is connected between described subtrator and described Bootstrap end, and the output of described power stage connects described Bootstrap end.
2. the self adaptation boost charge circuit for switch power converter according to claim 1, it is characterized in that, described subtrator comprises an operational amplifier, and described first input end connects the inverting input of described operational amplifier by one the 4th resistance.
3. the self adaptation boost charge circuit for switch power converter according to claim 2, is characterized in that, the inverting input of described operational amplifier connects a reference voltage by one the 3rd resistance.
4. the self adaptation boost charge circuit for switch power converter according to claim 3, is characterized in that, in-phase input end and one second resistance that the circuit between described second input is connected of described operational amplifier.
5. the self adaptation boost charge circuit for switch power converter according to claim 4, is characterized in that, the in-phase input end of described operational amplifier connects earth terminal by one first resistance.
6. the self adaptation boost charge circuit for switch power converter according to claim 2, is characterized in that, one the 5th resistance of connecting between described second input with described Bootstrap end.
7. the self adaptation boost charge circuit for switch power converter according to claim 5, is characterized in that, described first resistance is equal with the resistance of described 3rd resistance, and described second resistance is equal with the resistance of described 4th resistance.
8. the self adaptation boost charge circuit for switch power converter according to claim 5, is characterized in that, the resistance of described second resistance is m times of described first resistance, and wherein the span of m is 1 to 10 times.
9. the self adaptation boost charge circuit for switch power converter according to claim 5, it is characterized in that, described power stage comprises a field effect transistor, the source electrode of described field effect transistor connects an input supply voltage end, the anode of drain series one diode of described field effect transistor, the negative electrode of described diode connects described second input.
10. the self adaptation boost charge circuit for switch power converter according to claim 3, it is characterized in that, described reference voltage is equal with the reference voltage that the input of the error amplifier of described switch power converter provides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410153346.5A CN105099183B (en) | 2014-04-16 | 2014-04-16 | Adaptive boost charge circuit for switch power converter |
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| CN201410153346.5A CN105099183B (en) | 2014-04-16 | 2014-04-16 | Adaptive boost charge circuit for switch power converter |
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| CN105099183A true CN105099183A (en) | 2015-11-25 |
| CN105099183B CN105099183B (en) | 2018-11-23 |
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Citations (8)
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| CN1914787A (en) * | 2004-01-28 | 2007-02-14 | 株式会社瑞萨科技 | Switching power supply and semiconductor integrated circuit |
| JP2008141832A (en) * | 2006-11-30 | 2008-06-19 | Sanyo Electric Co Ltd | Switching control circuit |
| CN101247080A (en) * | 2007-02-16 | 2008-08-20 | 立锜科技股份有限公司 | Circuit for charging bootstrap capacitor of voltage converter |
| US20090135632A1 (en) * | 2007-11-26 | 2009-05-28 | Ricoh Company, Ltd. | Step-down switching regulator capable of providing high-speed response with compact structure |
| JP4830507B2 (en) * | 2006-01-20 | 2011-12-07 | 富士電機株式会社 | Bootstrap circuit |
| CN102577062A (en) * | 2010-07-08 | 2012-07-11 | 株式会社理光 | Driving circuit, semiconductor device having driving circuit, and switching regulator and electronic equipment using driving circuit and semiconductor device |
| CN103004071A (en) * | 2010-07-30 | 2013-03-27 | 奥的斯电梯公司 | Regulated bootstrap power supply |
| CN203813663U (en) * | 2014-04-16 | 2014-09-03 | 钰太芯微电子科技（上海）有限公司 | Self-adaptive boost charging circuit used for switch power supply converter |
-
2014
- 2014-04-16 CN CN201410153346.5A patent/CN105099183B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914787A (en) * | 2004-01-28 | 2007-02-14 | 株式会社瑞萨科技 | Switching power supply and semiconductor integrated circuit |
| JP4830507B2 (en) * | 2006-01-20 | 2011-12-07 | 富士電機株式会社 | Bootstrap circuit |
| JP2008141832A (en) * | 2006-11-30 | 2008-06-19 | Sanyo Electric Co Ltd | Switching control circuit |
| CN101247080A (en) * | 2007-02-16 | 2008-08-20 | 立锜科技股份有限公司 | Circuit for charging bootstrap capacitor of voltage converter |
| US20090135632A1 (en) * | 2007-11-26 | 2009-05-28 | Ricoh Company, Ltd. | Step-down switching regulator capable of providing high-speed response with compact structure |
| CN102577062A (en) * | 2010-07-08 | 2012-07-11 | 株式会社理光 | Driving circuit, semiconductor device having driving circuit, and switching regulator and electronic equipment using driving circuit and semiconductor device |
| CN103004071A (en) * | 2010-07-30 | 2013-03-27 | 奥的斯电梯公司 | Regulated bootstrap power supply |
| CN203813663U (en) * | 2014-04-16 | 2014-09-03 | 钰太芯微电子科技（上海）有限公司 | Self-adaptive boost charging circuit used for switch power supply converter |
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| CN105099183B (en) | 2018-11-23 |
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