CN105099183B - Adaptive boost charge circuit for switch power converter - Google Patents
Adaptive boost charge circuit for switch power converter Download PDFInfo
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- CN105099183B CN105099183B CN201410153346.5A CN201410153346A CN105099183B CN 105099183 B CN105099183 B CN 105099183B CN 201410153346 A CN201410153346 A CN 201410153346A CN 105099183 B CN105099183 B CN 105099183B
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- power converter
- switch power
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- charge circuit
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Abstract
The present invention relates to electronic technology fields, and in particular to a kind of boost charge circuit.Adaptive boost charge circuit for switch power converter, including a subtrator, subtrator includes, one first input end, connect the switching node end of a switch power converter, one second input terminal, as feedback input end, subtrator is supplied to Bootstrap end after carrying out subtraction to the voltage to switching node end and Bootstrap end at the Bootstrap end of connection switch power adapter；One power stage is connected between subtrator and Bootstrap end, and the output end of power stage connects Bootstrap end.The configuration of the present invention is simple can be measured in real time the difference between the first drive circuitry voltage end of switch power converter, and with the conducting of driving switch pipe M1, realization is effectively controlled and protected to Switching Power Supply.
Description
Technical field
The present invention relates to electronic technology fields, and in particular to a kind of boost charge circuit.
Background technique
For the Switching Power Supply conversion chip of high pressure or high current, since the conducting resistance of N-channel MOS pipe is smaller,
The usually one third or so of P-channel metal-oxide-semiconductor, can be than being occupied more using the chip of N-channel MOS pipe using P-channel metal-oxide-semiconductor
Small area has smaller conduction loss, thus generallys use derailing switch of the N-channel MOS pipe as switch power converter
Part.
When N-channel MOS pipe needs voltage drop Vgs to be between gate and source greater than a threshold voltage, can just it be connected, threshold
The presence of threshold voltage can generate biggish power consumption；As shown in Figure 1, being usually arranged certainly for the topology that upper down tube is all N pipe
Lifting volt circuit does not interfere with the pressure drop of power end VDD to switching node SW to allow the threshold voltage of upper tube；Especially by
One capacitor C2 is set between the end BS and switching node SW, and a 5V supply voltage is charged by diode D1 to capacitor C2, the end BS
High-end voltage needed for driving circuit is provided.Ideally, when down tube M2 is connected, switching node SW is in no-voltage, 5V
Supply voltage gives capacitor C2 quick charge by diode D1, so that the voltage at the both ends capacitor C2 is+5V, the end BS voltage is at this time
+5V；When upper tube M2 conducting, the end SW voltage can be increased to input voltage VDD by no-voltage, since the voltage at capacitor both ends cannot
Mutation, at this moment BS voltage is 5V+VDD, however when upper tube M1 and down tube M2 turn off under light-load mode, switching node SW is to suspend
State, switching node SW is approximately equal to output end voltage Vout at this time, so that not having between the grid and source electrode of upper tube M1 at light load
There is pressure drop, booster circuit does not work；Or when down tube M2 conducting, if switching node SW is negative value, and if the voltage of the end BS
May be higher, meeting under above-mentioned circuit environment influences the normal work of circuit so that uncontrolled state is presented in circuit.
Summary of the invention
The object of the present invention is to provide a kind of adaptive boost charge circuits for switch power converter, solve
The above technical problem.
Technical problem solved by the invention can be realized using following technical scheme：
Adaptive boost charge circuit for switch power converter, which is characterized in that including,
One subtrator, the subtrator include,
One first input end connects the switching node end of a switch power converter,
One second input terminal, connects the Bootstrap end of the switch power converter as feedback input end,
After the subtrator carries out subtraction to the voltage to the switching node end and the Bootstrap end
It is supplied to the Bootstrap end；
One power stage is connected between the subtrator and the Bootstrap end, and the output end of the power stage connects
Connect the Bootstrap end.
Preferably, the subtrator includes an operational amplifier, and the first input end is connected by one the 4th resistance
The inverting input terminal of the operational amplifier.
Preferably, the inverting input terminal of the operational amplifier connects a reference voltage by a 3rd resistor.
Preferably, one is connected on the circuit between the non-inverting input terminal of the operational amplifier and second input terminal
Two resistance.
Preferably, the non-inverting input terminal of the operational amplifier connects ground terminal by a first resistor.
Preferably, it connects between second input terminal and the Bootstrap end one the 5th resistance.
Preferably, the first resistor is equal with the resistance value of the 3rd resistor, the second resistance and the 4th electricity
The resistance value of resistance is equal.
Preferably, the resistance value of the second resistance is m times of the first resistor resistance value, wherein the value range of m be 1 to
10 times.
Preferably, the power stage includes a field-effect tube, and the source electrode of the field-effect tube connects an input supply voltage
The cathode at end, the anode of one diode of drain series of the field-effect tube, the diode connects second input terminal.
Preferably, the reference that the input terminal of the error amplifier of the reference voltage and the switch power converter provides
Voltage is equal.
Beneficial effect：Due to using the technology described above, the configuration of the present invention is simple, can be to the of switch power converter
Difference between one drive circuit supply voltage is measured in real time, and with the conducting of driving switch pipe M1, is realized to Switching Power Supply
Effectively control and protection.
Detailed description of the invention
Fig. 1 is the circuit diagram of the prior art；
Fig. 2 is electrical block diagram of the invention；
Fig. 3 is a kind of realization circuit diagram of operational amplification circuit of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
Referring to Fig. 2, Fig. 3, the adaptive boost charge circuit for switch power converter, wherein including,
One subtrator 21, subtrator 21 include,
One first input end, the switching node end of connection switch power adapter, switching node end are logical
The common end SW indicates；
One second input terminal, the Bootstrap end of connection switch power adapter is as feedback input end, certainly
Lifting pressure side is usually indicated with the end BOOT or the end BS；
Subtrator 21 is supplied to the end BOOT after carrying out subtraction to the voltage to the end SW and the end BOOT；
One power stage 22；It is connected between subtrator 21 and the end BOOT, the output end of power stage 22 connects the end BOOT.
As a kind of preferred embodiment of the invention, subtrator 21 includes an operational amplifier 211, first input end
Pass through the inverting input terminal of one the 4th resistance R4 connection operational amplifier 211（-）.
As a kind of preferred embodiment of the invention, the inverting input terminal of operational amplifier 211（-）Pass through third electricity
Hinder one reference voltage Vref of R3 connection.
As a kind of preferred embodiment of the invention, the non-inverting input terminal of operational amplifier 211（+）With the second input terminal
Between circuit on connect second resistance R2.
As a kind of preferred embodiment of the invention, the non-inverting input terminal of operational amplifier（+）Pass through a first resistor
R1 connection ground terminal PGND.
As a kind of preferred embodiment of the invention, connect one the 5th resistance R5 between the second input terminal and the end BOOT.
As a kind of preferred embodiment of the invention, first resistor R1 is equal with the resistance value of 3rd resistor R3, the second electricity
It is equal with the resistance value of the 4th resistance R4 to hinder R2.
As a kind of preferred embodiment of the invention, the resistance value of second resistance R2 is m times of first resistor R1 resistance value,
The value range of middle 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 invention, power stage 22 includes a field-effect tube 221, field-effect tube 221
Source electrode connects Input voltage terminal IN, and the cathode of the anode of one diode 222 of drain series of field-effect tube 221, diode 222 connects
Connect the second input terminal.
As a kind of preferred embodiment of the invention, the error amplifier of reference voltage Vref and switch power converter
Input terminal provide reference voltage it is equal.
A kind of specific embodiment, switch power converter are BUCK chip, as shown in Fig. 2,
Including,
One Input voltage terminal IN,
One end SW,
One ground terminal GND,
One first switch device M1 is set on the circuit between the end Input voltage terminal IN and SW；
One second switch device M2, is set on the circuit between the end SW and ground terminal GND；
One first driving circuit 1 connects the end BOOT and the end SW, and the end BOOT is provided under the action of a pulse-width signal
Voltage to first switch device M1 control terminal or the end SW voltage to first switch device M1 control terminal；
The element circuit 2 that one subtrator 21 and power stage 22 form mentions after carrying out operation to the voltage at the end BOOT, the end SW
The end BOOT is supplied, a charging capacitor is connected between the chip exterior of switch power converter, Bootstrap end SW and the end SW.
The configuration of the present invention is simple can be measured in real time the difference between the first drive circuitry voltage, to drive
The conducting of dynamic switching tube M1, realization are effectively controlled and are protected to Switching Power Supply.
As a kind of preferred embodiment of the invention, first switch device M1 and second switch device M2 use N ditch
Logical metal-oxide-semiconductor, the drain electrode of first switch device M1 connect Input voltage terminal IN, and the source electrode of first switch device M1 connects the end SW, the
The grid of one switching device M1 connects the signal output end of the first driving circuit 1；The drain electrode of second switch device M2 connects the end SW,
The source electrode of second switch device M2 connects ground terminal GND.
As a kind of preferred embodiment of the invention, pulse-width signal is generated by a control circuit, control circuit
Including,
One error amplifier 3 obtains error amplification to be compared to a voltage feedback signal FB with reference voltage
Signal；
One comparator 4 generates a comparison signal to be compared to a current detection signal and error amplification signal；
One oscillator 5, for generating clock signal；
One rest-set flip-flop 6, for generating pulse-width signal according to comparison signal and clock signal.The end Q of rest-set flip-flop 6
The first driving circuit 1 is connected, the Q negative terminal of rest-set flip-flop 6 connects a buffer 7, and the signal output end connection second of buffer 7 is opened
Close the control terminal of device M2.
Since finally control that signal to be controlled is high-power switch tube, and the general W/L of power tube is bigger, parasitic electricity
Appearance is also relatively large, in the higher situation of switching frequency, biggish driving current is needed to carry out driving power pipe, therefore, switch
Control signal needs certain driving circuit to reinforce the driving capability of signal.
As a kind of preferred embodiment of the invention, oscillator 5 is also used to export a slope compensation signal, for electricity
Stream detection signal carries out slope compensation.Specifically, setting accumulator 11 carries out slope compensation signal with current detection signal tired
Add.Signal input comparator 4 after cumulative is to be compared generation comparison signal with error amplification signal.
As a kind of preferred embodiment of the invention, voltage feedback signal FB passes through the feedback network that an output end is drawn
It realizes.Feedback network is connected between the end SW and ground terminal GND.
As a kind of preferred embodiment of the invention, current detection signal is realized by a current detecting branch, electric current
Detection branch include a detection resistance, series connection and the circuit between Input voltage terminal and first switch device M1 on, detection resistance
Both ends be separately connected a difference amplifier 8, for generating current detection signal.
As a kind of preferred embodiment of the invention, control circuit further includes an oscillator 5, for generating pulse letter
Number, and high-frequency output mode or low frequency output mode are selectively worked according to voltage feedback signal.Especially by general
Voltage feedback signal FB is compared with the reference voltage of a 0.3V, when voltage feedback signal FB is lower than 0.3V, 5 work of oscillator
Make in low frequency output mode, 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 invention, the invention also includes soft starting circuit 9, soft starting circuit 9 it is defeated
Outlet connects error amplifier 3, for being lifted the output voltage of error amplifier 3 slowly when the input terminal of circuit powers on,
System is allowed to progress into stable working condition, once system starts, soft starting circuit will no longer have an effect.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (10)
1. being used for the adaptive boost charge circuit of switch power converter, which is characterized in that including,
One subtrator (21), the subtrator (21) include,
One first input end connects the switching node end (SW) of a switch power converter,
One second input terminal, the Bootstrap end (BOOT) for connecting the switch power converter are used as feedback input end,
The subtrator (21) carries out to the voltage to the switching node end (SW) and the Bootstrap end (BOOT)
The Bootstrap end (BOOT) is supplied to after subtraction；
One power stage (22) is connected between the subtrator (21) and the Bootstrap end (BOOT), the power stage
(22) output end connects the Bootstrap end (BOOT)；
A first switch is connected between the switching node end (SW) and the Input voltage terminal (IN) of the switch power converter
Device (M1)；One second switch device (M2) is set between the switching node end (SW) and ground terminal GND；The first switch
Device (M1) and the second switch device (M2) all link up metal-oxide-semiconductor using N；
Further include one first driving circuit (1), the switching node end (SW) and the Bootstrap end (BOOT) is connected, one
The voltage of the Bootstrap end (BOOT) is provided under the action of pulse-width signal to the control of the first switch device (M1)
The voltage at end processed or the switching node end (SW) to the first switch device (M1) control terminal；
The switch power converter is BUCK chip, and the drain electrode of the first switch device (M1) connects the Input voltage terminal
(IN), the source electrode of the first switch device (M1) connects the switching node end (SW), the first switch device (M1)
Grid connects the signal output end of first driving circuit (1)；It is opened described in the drain electrode connection of the second switch device (M2)
The source electrode at artis end (SW), second switch device (M2) connects the ground terminal GND.
2. the adaptive boost charge circuit according to claim 1 for switch power converter, which is characterized in that institute
Stating subtrator (21) includes an operational amplifier (211), and the first input end passes through described in the connection of one the 4th resistance (R4)
The inverting input terminal (-) of operational amplifier (211).
3. the adaptive boost charge circuit according to claim 2 for switch power converter, which is characterized in that institute
The inverting input terminal (-) for stating operational amplifier (211) passes through a 3rd resistor (R3) connection one reference voltage (Vref).
4. the adaptive boost charge circuit according to claim 3 for switch power converter, which is characterized in that institute
State a second resistance of connecting on the circuit between the non-inverting input terminal (+) of operational amplifier (211) and second input terminal
(R2)。
5. the adaptive boost charge circuit according to claim 4 for switch power converter, which is characterized in that institute
The non-inverting input terminal (+) for stating operational amplifier (211) connects ground terminal PGND by a first resistor (R1).
6. the adaptive boost charge circuit according to claim 2 for switch power converter, which is characterized in that institute
State one the 5th resistance (R5) of connecting between the second input terminal and the Bootstrap end (BOOT).
7. the adaptive boost charge circuit according to claim 5 for switch power converter, which is characterized in that institute
It is equal with the resistance value of the 3rd resistor (R3) to state first resistor (R1), the second resistance (R2) and the 4th resistance (R4)
Resistance value it is equal.
8. the adaptive boost charge circuit according to claim 5 for switch power converter, which is characterized in that institute
The resistance value for stating second resistance (R2) is m times of the first resistor (R1) resistance value, and wherein the value range of m is 1 to 10 times.
9. the adaptive boost charge circuit according to claim 5 for switch power converter, which is characterized in that institute
Stating power stage (22) includes a field-effect tube (211), and the source electrode of the field-effect tube (211) connects an Input voltage terminal (IN),
The cathode of the anode of one diode of drain series of the field-effect tube (211), the diode connects second input terminal.
10. the adaptive boost charge circuit according to claim 3 for switch power converter, which is characterized in that
The reference voltage phase that the input terminal of the reference voltage (Vref) and the error amplifier (3) of the switch power converter provides
Deng.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410153346.5A CN105099183B (en) | 2014-04-16 | 2014-04-16 | Adaptive boost charge circuit for switch power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410153346.5A CN105099183B (en) | 2014-04-16 | 2014-04-16 | Adaptive boost charge circuit for switch power converter |
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| CN105099183A CN105099183A (en) | 2015-11-25 |
| CN105099183B true CN105099183B (en) | 2018-11-23 |
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Citations (6)
| 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 |
| 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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4938425B2 (en) * | 2006-11-30 | 2012-05-23 | オンセミコンダクター・トレーディング・リミテッド | Switching control circuit |
| JP5169170B2 (en) * | 2007-11-26 | 2013-03-27 | 株式会社リコー | Step-down switching regulator |
-
2014
- 2014-04-16 CN CN201410153346.5A patent/CN105099183B/en active Active
Patent Citations (6)
| 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 |
| 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 |
| 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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| CN105099183A (en) | 2015-11-25 |
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