CN203813663U - Self-adaptive boost charging circuit used for switch power supply converter - Google Patents
Self-adaptive boost charging circuit used for switch power supply converter Download PDFInfo
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- CN203813663U CN203813663U CN201420185329.5U CN201420185329U CN203813663U CN 203813663 U CN203813663 U CN 203813663U CN 201420185329 U CN201420185329 U CN 201420185329U CN 203813663 U CN203813663 U CN 203813663U
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Abstract
The utility model relates to the electronic technology field, and concretely relates to a boost charging circuit. The self-adaptive boost charging circuit comprises a subtractor. The subtractor comprises a first input end which is connected with a switch node end of a switch power supply converter, and a second input end which is connected with a bootstrap end of the switch power supply converter as a feedback input end. The subtractor is used for subtraction of the voltage of the switch node end and the bootstrap end and then provides the voltage to the bootstrap end. The self-adaptive boost charging circuit also comprises a power stage which is connected between the subtractor and the bootstrap end. The output end of the power stage is connected with the bootstrap end. The self-adaptive boost charging circuit is simple in structure, can carry out real-time detection of difference of power supply voltage ends of the first driving circuit of the switch power supply converter to drive connection of a switch tube M1 and achieves effective control and protection of a switch power supply.
Description
Technical field
The utility model relates to electronic technology field, is specifically related to a kind of boost charge circuit.
Background technology
For the Switching Power Supply conversion chip of high pressure or large electric current, because the conducting resistance of N-channel MOS pipe is less, generally 1/3rd left and right of P channel MOS tube, adopt the chip of N-channel MOS pipe to take less area than employing P channel MOS tube, there is less conduction loss, thereby conventionally adopt the switching device of N-channel MOS pipe as switch power converter.
When N-channel MOS pipe need to the voltage drop Vgs between grid and source electrode be greater than a threshold voltage, just can 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, conventionally bootstrap circuit boost is set to allow the threshold voltage of pipe, can have influence on the pressure drop of power end VDD to switching node SW; Specifically charge to capacitor C 2 by diode D1 by capacitor C 2, one 5V supply voltages being set between BS end and switching node SW, BS end provides drive circuit required high terminal voltage.Ideally, while instantly managing M2 conducting, switching node SW is in no-voltage, and 5V supply voltage is by diode D1 to capacitor C 2 quick charges, and making the voltage at capacitor C 2 two ends is+5V that now BS terminal voltage is+5V; In the time of 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 underloading pattern, upper pipe M1 and lower pipe M2 turn off, switching node SW is suspended state, now switching node SW is approximately equal to output end voltage Vout, while making underloading, between the grid of upper pipe M1 and source electrode, there is no pressure drop, booster circuit is inoperative; Or while instantly managing M2 conducting, if switching node SW is negative value, BS terminal voltage may be higher, under above-mentioned circuit environment, can make circuit present not controlled state, affects the normal work of circuit.
Utility model content
The purpose of this utility model is, a kind of self adaptation boost charge circuit for switch power converter is provided, and solves above technical problem.
The technical problem that the utility model solves 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, the switching node end of connection one switch power converter,
One second input, connects the Bootstrap end of described switch power converter as feedback input end,
Described subtrator is in order to carry out offering described Bootstrap end after 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, one second resistance of connecting on the circuit between the in-phase input end of described operational amplifier and described the second input.
Preferably, the in-phase input end of described operational amplifier connects earth terminal by one first resistance.
Preferably, one the 5th resistance of connecting between described the second input and described Bootstrap end.
Preferably, described the first resistance equates with the resistance of described the 3rd resistance, and described the second resistance equates with the resistance of described the 4th resistance.
Preferably, the resistance of described the second resistance is m times of described the 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 connect anode of a diode of the drain electrode of described field effect transistor, and the negative electrode of described diode connects described the second input.
Preferably, described reference voltage equates 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; the utility model is simple in structure; can detect in real time the difference between the first drive circuitry voltage of switch power converter, with the conducting of driving switch pipe M1, realize the effective control and protection of Switching Power Supply.
Brief description of the drawings
Fig. 1 is the circuit diagram of prior art;
Fig. 2 is electrical block diagram of the present utility model;
Fig. 3 is that the one of operational amplification circuit of the present utility model realizes circuit diagram.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the utility model can combine mutually.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
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 represents with SW end conventionally;
One second input, the Bootstrap end of connecting valve power supply changeover device is as feedback input end, and Bootstrap end represents with BOOT end or BS end conventionally;
Subtrator 21 is in order to carry out offering BOOT end after subtraction to the voltage of SW end and BOOT end;
One power stage 22; Be connected between subtrator 21 and BOOT end, the output of power stage 22 connects BOOT end.
As preferably embodiment of one of the present utility model, subtrator 21 comprises an operational amplifier 211, and first input end is by the inverting input (-) of one the 4th resistance R 4 concatenation operation amplifiers 211.。
As preferably embodiment of one of the present utility model, the inverting input (-) of operational amplifier 211 connects a reference voltage Vref by one the 3rd resistance R 3.
As preferably embodiment of one of the present utility model, second resistance R 2 of connecting on the circuit between in-phase input end (+) and second input of operational amplifier 211.
As preferably embodiment of one of the present utility model, the in-phase input end (+) of operational amplifier connects earth terminal PGND by one first resistance R 1.
As preferably embodiment of one of the present utility model, one the 5th resistance R 5 of connecting between the second input and BOOT end.
As preferably embodiment of one of the present utility model, the first resistance R 1 equates with the resistance of the 3rd resistance R 3, and the second resistance R 2 equates with the resistance of the 4th resistance R 4.
As preferably embodiment of one of the present utility model, the resistance of the second resistance R 2 is m times of the first resistance R 1 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 utility model, power stage 22 comprises a field effect transistor 221, the source electrode of field effect transistor 221 connects Input voltage terminal IN, the connect anode of a diode 222 of the drain electrode of field effect transistor 221, and the negative electrode of diode 222 connects the second input.
As preferably embodiment of one of the present utility model, reference voltage Vref equates 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, and the BOOT control end of voltage to the first switching device M1 or the control end of SW terminal voltage to the first switching device M1 of end are provided under the effect of a pulse-width signal;
The element circuit 2 that one subtrator 21 and power stage 22 form, carries out offering BOOT end after computing to the voltage of BOOT end, SW end, in the chip exterior of switch power converter, between Bootstrap end SW and SW end, is connected a charging capacitor.
The utility model is simple in structure, can detect in real time the difference between the first drive circuitry voltage, with the conducting of driving switch pipe M1, realizes the effective control and protection of Switching Power Supply.
As a kind of preferred embodiment of the present utility model, the first switching device M1 and second switch device M2 adopt 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 utility model, pulse-width signal produces by a control circuit, and control circuit comprises,
One error amplifier 3, in order to a voltage feedback signal FB and reference voltage are compared, obtains an error amplification signal;
One comparator 4, in order to a current detection signal and error amplification signal are compared, 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 end of rest-set flip-flop 6 connects the 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, in the situation that switching frequency is higher, need larger drive current 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 utility model, oscillator 5 is also for exporting a slope compensation signal, for current detection signal is carried out to slope compensation.Particularly, accumulator 11 being set adds up slope compensation signal and current detection signal.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 utility model, the feedback network that voltage feedback signal FB draws by an output is realized.Feedback network is connected between SW end and earth terminal GND.
As a kind of preferred embodiment of the present utility model, current detection signal is realized by a current detecting branch road, current detecting branch road comprises a detection resistance, on circuit between series connection and Input voltage terminal and the first switching device M1, the two ends of detecting resistance connect respectively a differential amplifier 8, for generation of current detection signal.
As a kind of preferred embodiment of the present utility model, 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.Specifically by the reference voltage of voltage feedback signal FB and a 0.3V is compared, when voltage feedback signal FB is during lower than 0.3V, oscillator 5 works in low frequency output mode, and when voltage feedback signal FB is during higher than 0.3V, oscillator 5 works in high-frequency output mode.
As a kind of preferred embodiment of the present utility model, the utility model also comprises soft starting circuit 9, the output of soft starting circuit 9 connects error amplifier 3, for in the time that the input of circuit powers on, make the slow lifting of 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 the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; the scheme that being equal to of should recognizing that all utilization the utility model specifications and diagramatic content done replaces and apparent variation obtains, all should be included in protection range of the present utility model.
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, the switching node end of connection one switch power converter,
One second input, connects the Bootstrap end of described switch power converter as feedback input end,
Described subtrator is in order to carry out offering described Bootstrap end after 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, one second resistance of connecting on the circuit between the in-phase input end of described operational amplifier and described the second input.
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 the second input and described Bootstrap end.
7. the self adaptation boost charge circuit for switch power converter according to claim 5, is characterized in that, described the first resistance equates with the resistance of described the 3rd resistance, and described the second resistance equates with the resistance of described the 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 the second resistance is m times of described the 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 connect anode of a diode of the drain electrode of described field effect transistor, the negative electrode of described diode connects described the second input.
10. the self adaptation boost charge circuit for switch power converter according to claim 3, is characterized in that, described reference voltage equates 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 |
|---|---|---|---|
| CN201420185329.5U CN203813663U (en) | 2014-04-16 | 2014-04-16 | Self-adaptive boost charging circuit used for switch power supply converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420185329.5U CN203813663U (en) | 2014-04-16 | 2014-04-16 | Self-adaptive boost charging circuit used for switch power supply converter |
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| CN203813663U true CN203813663U (en) | 2014-09-03 |
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| CN201420185329.5U Expired - Fee Related CN203813663U (en) | 2014-04-16 | 2014-04-16 | Self-adaptive boost charging circuit used for switch power supply converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099183A (en) * | 2014-04-16 | 2015-11-25 | 钰太芯微电子科技（上海）有限公司 | Self-adaptive boost charging circuit used for switching power supply converter |
| CN106911251A (en) * | 2015-12-22 | 2017-06-30 | 上海贝岭股份有限公司 | Boost power converter |
-
2014
- 2014-04-16 CN CN201420185329.5U patent/CN203813663U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099183A (en) * | 2014-04-16 | 2015-11-25 | 钰太芯微电子科技（上海）有限公司 | Self-adaptive boost charging circuit used for switching power supply converter |
| CN105099183B (en) * | 2014-04-16 | 2018-11-23 | 钰太芯微电子科技（上海）有限公司 | Adaptive boost charge circuit for switch power converter |
| CN106911251A (en) * | 2015-12-22 | 2017-06-30 | 上海贝岭股份有限公司 | Boost power converter |
| CN106911251B (en) * | 2015-12-22 | 2020-05-22 | 上海贝岭股份有限公司 | Step-down power converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ye Jinghua Inventor after: Chen Jia Inventor before: Ye Jinghua |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YE JINGHUA TO: YE JINGHUA CHEN JIA |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20200416 |