CN106160467B - Enhance the booster type DC-DC converter of transient response - Google Patents
Enhance the booster type DC-DC converter of transient response Download PDFInfo
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- CN106160467B CN106160467B CN201510134263.6A CN201510134263A CN106160467B CN 106160467 B CN106160467 B CN 106160467B CN 201510134263 A CN201510134263 A CN 201510134263A CN 106160467 B CN106160467 B CN 106160467B
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Abstract
The present invention relates to electronic technology fields, and in particular to a kind of DC DC converters.Enhance the booster type DC-DC converter of transient response, including, one is provided with the operating circuit of energy-storage travelling wave tube, it is changeable to be connected to an input terminal, an output end, one cross between node and a ground terminal, alternately switch between charge mode and discharge mode in PWM modulation signal or the lower control operating circuit of PFM modulated signals effect；One control unit, to generate PWM modulation signal or PFM modulated signals under the current detection signal effect of operating circuit by the input signal of selecting switch selection, a sampling according to one.The present invention can switch over the input signal of comparator by a selecting switch when increasing load current moment, to improve the transient response of circuit, to ensure that system is stablized.
Description
Technical field
The present invention relates to electronic technology fields, and in particular to a kind of DC-DC converter.
Background technology
Booster type DC-DC converter is with its low suppling voltage, low-power consumption, high efficiency, high output voltage and big output current
The features such as be widely used in the mobile devices such as smart mobile phone, tablet computer, according to controlling mechanism difference, step-up DC-DC turns
Parallel operation is divided into PWM (Pulse Width Modulation) control mode, PFM (Pulse Frequency Modulation) controls
Three kinds of mode processed and mixed-control mode, mixed-control mode are gently being loaded in heavy duty using PWM working methods
In the case of, PFM working methods are switched to, to ensure that all there is higher transfer efficiency in entire loading range Internal Translator, so
And booster type DC-DC converter as shown in Figure 1 is in application process, in load jump, the output voltage of converter exists
Larger overshoot or decline influence chip performance and system stability.
Invention content
The object of the present invention is to provide a kind of booster type DC-DC converters of enhancing transient response, solve the above technology
Problem；
Following technical scheme may be used to realize in technical problem solved by the invention：
Enhance the booster type DC-DC converter of transient response, wherein including,
One is provided with the operating circuit of energy-storage travelling wave tube, for generating the output for being higher than input voltage
Voltage；
One switching device group is connected in the operating circuit, is acted in a PWM modulation signal or a PFM modulated signals
The lower control operating circuit alternately switches between charge mode and discharge mode；
One control unit, to according to one by the input signal of selecting switch selection, a sampling from the energy-storage travelling wave tube
The current detection signal effect of charging current is lower to generate the PWM modulation signal or PFM modulated signals.
The booster type DC-DC converter of the enhancing transient response of the present invention, described control unit includes,
One comparator generates comparison signal for being compared with the current detection signal to the input signal；
One clock unit, for generating clock signal；
One PWM/PFM modulators, the PWM/PFM modulators connect the clock signal, for relatively believing according to described
Number and the clock signal generate the PWM modulation signal or the PFM modulated signals.
The booster type DC-DC converter of the enhancing transient response of the present invention, the selecting switch is in a first control signal
Under the action of select wherein to export all the way between one first signal and one second reference signal as the input signal.
The booster type DC-DC converter of the enhancing transient response of the present invention, first signal are carried by an error amplifier
For the error amplifier is by sampling a reference voltage and one Voltage Feedback from the output end of the DC-DC converter
Signal is compared to obtain an error amplification signal, using the error amplification signal as first signal.
The booster type DC-DC converter of the enhancing transient response of the present invention, the first control signal pass through a logic control
Unit processed generates, and the input terminal of the logic control element connects the error amplification signal, believes to amplify to the error
It number is compared with a third reference voltage, the first control signal is generated according to comparison result.
The booster type DC-DC converter of the enhancing transient response of the present invention, the operating circuit includes,
Charge control branch is connected to a ground terminal and one and crosses between node；
Charge and discharge branch is connected between an input terminal and the node that crosses；
Control of discharge branch is connected to described cross between node and the output end；
The energy-storage travelling wave tube is series at the charge and discharge branch road；
The operating circuit is when charge mode, and the charge control branch and charge and discharge branch conducting are described to put
Electric control branch disconnects, and the electric current of the input terminal input charges to the energy-storage travelling wave tube；
The operating circuit is when discharge mode, and the control of discharge branch and charge and discharge branch conducting are described to fill
Electric control branch disconnects, and the energy-storage travelling wave tube discharges to the output end.
The booster type DC-DC converter of the enhancing transient response of the present invention, the voltage feedback signal pass through a feedback net
Network generates, and the feedback network is mainly formed by a resistor voltage divider circuit, and the resistor voltage divider circuit includes predetermined number and phase
The divider resistance being mutually connected in series between the output end and the ground terminal, the dot being connected between the divider resistance
At divider node, the voltage feedback signal is drawn from the divider node.
The booster type DC-DC converter of the enhancing transient response of the present invention, the current detection signal pass through an electricity
Current detection circuit generates, and the current detection circuit includes：
One detection resistance is series on the current detection circuit；
One current sampling unit connects the both ends of the detection resistance, to detect the electric current for flowing through the detection resistance；
One detection that break-make is controlled by the PWM modulation signal or PFM modulated signals controls switch, is connected to the electric current
In detection circuit.
The booster type DC-DC converter of the enhancing transient response of the present invention, the detection control switch use the gold of N-channel
Belong to oxide semiconductor field effect transistor.
Advantageous effect：Due to using the technology described above, the present invention can be led to when increaseing or decreasing load current moment
It crosses a selecting switch to switch the input signal of comparator in time, the transient response of circuit can be improved, to ensure that system is stablized.
Description of the drawings
Fig. 1 is the step-up DC-DC converter circuit structure figures of the prior art；
Fig. 2 is the oscillogram of the coherent signal of the prior art；
Fig. 3 is the step-up DC-DC converter circuit structure schematic diagrames of the present invention；
Fig. 4 is the oscillogram of the coherent signal of the present invention.
Specific implementation mode
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 describes, 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 obtained under the premise of not making creative work 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 invention will be further described in the following with reference to the drawings and specific embodiments, but not as limiting to the invention.
In conjunction with the prior art circuit structure such as Fig. 1 and coherent signal oscillogram as shown in Fig. 2, load current increases suddenly
Added-time cannot track the variation of load current, the output end signal of error amplifier in time since circuit transient response is poor
Vea_out slowly rises, and current sampling signal CS is caused slowly to rise, and system response speed is excessively slow.
The present invention provides a kind of booster type DC-DC converter of enhancing transient response, with reference to Fig. 3, Fig. 4, including,
One is provided with the operating circuit of energy-storage travelling wave tube；Changeable is connected to an input terminal VDD, an output end vo ut, one
It crosses between node Lx and a ground terminal GND, in PWM modulation signal or the lower control operating circuit of PFM modulated signals effect in filling
Alternately switch between power mode and discharge mode；
One control unit, to electric from energy-storage travelling wave tube charging by the input signal of selecting switch selection, a sampling according to one
The current detection signal CS effects of stream are lower to generate modulated signal.
The booster type DC-DC converter of the enhancing transient response of the present invention, control unit may include,
One comparator 2 generates comparison signal for being compared with current detection signal CS to input signal；
One clock unit 5, for generating clock signal；
One PWM/PFM modulators 1, PWM/PFM modulators 1 connect clock signal, for believing according to comparison signal and clock
Number generate PWM modulation signal or PFM modulated signals.
The booster type DC-DC converter of the enhancing transient response of the present invention, selecting switch 9 can be in a first control signal
It selects wherein to be exported all the way as input signal between one first signal and one second reference signal Vref2 under the action of SEL.
By the switching of selecting switch 9, when load current moment can be made to become larger, the second reference signal Vref2 is accessed into comparator
2 so that the reaction of current sampling signal CS is unlikely to that too slowly, the transient response of circuit can be improved, to ensure that system is steady
It is fixed.
The booster type DC-DC converter of the enhancing transient response of the present invention, the first signal are provided by an error amplifier 6,
Error amplifier 6 passes through the voltage feedback signal Vfb to the samplings of a reference voltage V ref and one from the output end of DC-DC converter
It is compared, using obtained error amplification signal Vea_out as the first signal.
The booster type DC-DC converter of the enhancing transient response of the present invention, first control signal SEL pass through a logic control
Unit 8 generates, the input terminal VDD connection error amplification signal Vea_out of logic control element 8, to error amplification signal
Vea_out is compared with a third reference voltage, and first control signal SEL is generated according to comparison result.Logic control element 8
When load current increases suddenly, first control signal SEL is generated.
The booster type DC-DC converter of the enhancing transient response of the present invention, operating circuit includes,
Charge control branch is connected to ground terminal GND between the node Lx that crosses；
Charge and discharge branch is connected to input terminal VDD between the node Lx that crosses；
Control of discharge branch is connected to and crosses between node Lx and output end vo ut；
Energy-storage travelling wave tube L is series at charge and discharge branch road；
When charge mode, charge control branch and the conducting of charge and discharge branch, control of discharge branch disconnect, make operating circuit
The electric current of input terminal VDD inputs charges to energy-storage travelling wave tube L；
Operating circuit is when discharge mode, control of discharge branch and the conducting of charge and discharge branch, and controls charge control branch
It disconnects, energy-storage travelling wave tube L is made to discharge output end vo ut.
The booster type DC-DC converter of the enhancing transient response of the present invention, current detection signal CS pass through a current detecting
Circuit generates, and current detection circuit includes：
One detection resistance Rb, is series on current detection circuit；
One current sampling unit 3, the both ends of connecting detection resistance Rb, to detect the electric current for flowing through detection resistance Rb；
One detection that break-make is controlled by PWM modulation signal or PFM modulated signals controls switch Msen, is connected to current detecting
On circuit.Current detection circuit may be used other circuit structures in the prior art and realize that this will not be repeated here.
The booster type DC-DC converter of the enhancing transient response of the present invention, voltage feedback signal Vfb pass through a feedback network
It generates, feedback network is mainly formed by a resistor voltage divider circuit, and resistor voltage divider circuit includes predetermined number and connects with being serially connected
The divider resistance being connected between output end vo ut and ground terminal GND, the dot being connected between divider resistance is at divider node, voltage
Feedback signal Vfb is drawn from divider node.
A kind of specific embodiment, charge control branch one N-channel MOS pipe Mn of road series connection, one P of control of discharge branch road series connection
Channel MOS tube Mp；Wherein the substrate of N-channel MOS pipe Mn is controlled by a control signal Body SEL.One capacitance C is connected to defeated
Between outlet Vout and ground terminal GND；The resistance R1 and resistance being serially connected are also connected between output end vo ut and ground terminal GND
It is drawn at the point that R2, voltage feedback signal self-resistance R1 and resistance R2 are connected.
The booster type DC-DC converter of the enhancing transient response of the present invention can also include a zero cross detection circuit 7, with
PWM/PFM modulators 1 connect.The zero cross detection circuit of the prior art may be used to realize, therefore not to repeat here.
The present invention can select the second reference signal Vref2 to connect when changing load current moment by a selecting switch
Enter comparator, the input letter realized to generate corresponding modulated signal to comparator is compared with current detection signal CS
Number in time switching, the transient response of circuit can be improved, with ensure system stablize.
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 (7)
1. enhancing the booster type DC-DC converter of transient response, which is characterized in that including,
One is provided with the operating circuit of energy-storage travelling wave tube, for generating an output voltage for being higher than input voltage；
One switching device group is connected in the operating circuit, in a PWM modulation signal or the lower control of PFM modulated signals effect
The operating circuit is made between charge mode and discharge mode alternately to switch；
One control unit, to according to one by the input signal of selecting switch selection, a sampling from the charging of the energy-storage travelling wave tube
The current detection signal effect of electric current is lower to generate the PWM modulation signal or PFM modulated signals；
The selecting switch selects under the action of a first control signal between one first signal and one second reference signal
Wherein output is used as the input signal all the way；
First signal is provided by an error amplifier, and the error amplifier is by sampling from institute one reference voltage and one
The voltage feedback signal for stating the output end of DC-DC converter is compared to obtain an error amplification signal, is amplified with the error
Signal is as first signal.
2. the booster type DC-DC converter of enhancing transient response according to claim 1, which is characterized in that the control
Unit includes,
One comparator generates comparison signal for being compared with the current detection signal to the input signal；
One clock unit, for generating clock signal；
One PWM/PFM modulators, the PWM/PFM modulators connect the clock signal, for according to the comparison signal and
The clock signal generates the PWM modulation signal or the PFM modulated signals.
3. the booster type DC-DC converter of enhancing transient response according to claim 1, which is characterized in that described first
Control signal is generated by a logic control element, and the input terminal of the logic control element connects the error amplification signal,
To be compared with a third reference voltage to the error amplification signal, the first control letter is generated according to comparison result
Number.
4. the booster type DC-DC converter of enhancing transient response according to claim 1, which is characterized in that the work
Circuit includes,
Charge control branch is connected to a ground terminal and one and crosses between node；
Charge and discharge branch is connected between an input terminal and the node that crosses；
Control of discharge branch is connected to described cross between node and the output end；
The energy-storage travelling wave tube is series at the charge and discharge branch road；
The operating circuit is when charge mode, the charge control branch and charge and discharge branch conducting, the electric discharge control
Branch processed disconnects, and the electric current of the input terminal input charges to the energy-storage travelling wave tube；
The operating circuit is when discharge mode, the control of discharge branch and charge and discharge branch conducting, the charging control
Branch processed disconnects, and the energy-storage travelling wave tube discharges to the output end.
5. the booster type DC-DC converter of enhancing transient response according to claim 4, which is characterized in that the voltage
Feedback signal is generated by a feedback network, and the feedback network is mainly formed by a resistor voltage divider circuit, the electric resistance partial pressure
Circuit includes predetermined number and is connected in series with each other the divider resistance between the output end and the ground terminal, described point
The dot being connected between piezoresistance is drawn at divider node, the voltage feedback signal from the divider node.
6. the booster type DC-DC converter of enhancing transient response according to claim 1, which is characterized in that the electric current
It detects signal to generate by a current detection circuit, the current detection circuit includes：
One detection resistance is series on the current detection circuit；
One current sampling unit connects the both ends of the detection resistance, to detect the electric current for flowing through the detection resistance；
One detection that break-make is controlled by the PWM modulation signal or PFM modulated signals controls switch, is connected to the current detecting
On circuit.
7. the booster type DC-DC converter of enhancing transient response according to claim 1, which is characterized in that the detection
Control switch uses the mos field effect transistor of N-channel.
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| CN201510134263.6A CN106160467B (en) | 2015-03-25 | 2015-03-25 | Enhance the booster type DC-DC converter of transient response |
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| CN201510134263.6A CN106160467B (en) | 2015-03-25 | 2015-03-25 | Enhance the booster type DC-DC converter of transient response |
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| CN109002077B (en) * | 2018-08-17 | 2020-07-10 | 电子科技大学 | Transient enhancement circuit |
| TWI784279B (en) * | 2020-05-29 | 2022-11-21 | 大陸商北京集創北方科技股份有限公司 | DC-DC conversion circuit and information processing device |
| CN117941236A (en) * | 2021-11-18 | 2024-04-26 | 华为技术有限公司 | Power supply circuit and electronic device |
| CN117879348B (en) * | 2023-04-26 | 2024-06-11 | 杭州顺元微电子有限公司 | Step-down DCDC converter |
| CN119315835A (en) * | 2024-12-16 | 2025-01-14 | 湖南恩智测控技术有限公司 | A power supply output voltage down-regulation control circuit |
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| JP3717492B2 (en) * | 2003-04-16 | 2005-11-16 | ローム株式会社 | Power supply |
| JP2005130616A (en) * | 2003-10-23 | 2005-05-19 | Matsushita Electric Ind Co Ltd | Power system |
| JP2011061989A (en) * | 2009-09-10 | 2011-03-24 | Renesas Electronics Corp | Switching regulator |
| JP2012191821A (en) * | 2011-03-14 | 2012-10-04 | Toshiba Corp | Current direction detection circuit and dc-dc converter |
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