CN105811756B - A kind of BUCK type power adapter of mixing control - Google Patents

A kind of BUCK type power adapter of mixing control Download PDF

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Publication number
CN105811756B
CN105811756B CN201410844542.7A CN201410844542A CN105811756B CN 105811756 B CN105811756 B CN 105811756B CN 201410844542 A CN201410844542 A CN 201410844542A CN 105811756 B CN105811756 B CN 105811756B
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signal
pfm
pwm
resistance
current
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CN201410844542.7A
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CN105811756A (en
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樊茂
史军梁
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展讯通信(上海)有限公司
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Abstract

A kind of a kind of BUCK type power adapter of mixing control, and in particular to power adapter.Operating circuit including being provided with energy-storage travelling wave tube;Switching device group acts on lower control operating circuit in PWM modulation signal or PFM modulated signal and alternately switches between charge mode and discharge mode;Control unit, to generate PWM modulation signal or PFM modulated signal according to reference voltage, voltage feedback signal and current detection signal;Current detection signal is generated by current sampling circuit, and current sampling circuit changes the oversampling ratio of electric current under the action of PWM/PFM switching signal.The present invention can be when entering PFM mode, reduce the oversampling ratio of electric current, so that encountering the case where load increases suddenly, electric current is still in small oversampling ratio state, so that output electric current increases, after the short time restores, the oversampling ratio of current sampling circuit returns to normal value, the transient response of circuit can be improved, to ensure that system is stablized.

Description

A kind of BUCK type power adapter of mixing control

Technical field

The present invention relates to electronic technology fields, and in particular to a kind of power adapter.

Background technique

With the fast development of microelectric technique, voltage-dropping type (BUCK) power adapter is since circuit structure is simple, adjustment Convenient, high reliability, in buck occasion extensive application;According to controlling mechanism difference, buck DC-DC transformation Device is divided into PWM (Pulse Width Modulation) control mode, PFM (Pulse Frequency Modulation) control Mode and three kinds of mixed-control mode, mixed-control mode is in heavy duty, using PWM working method, in gently load feelings Under condition, it is switched to PFM working method, with the advantage using PWM working method and PFM working method respectively, improves converter Transfer efficiency is applied to more and more in the control circuit of Switching Power Supply, however, buck DC-DC as described in Figure 1 becomes In application process, the unexpected increase of controlled load is so that output voltage fluctuates larger, the electricity of the prior art as shown in Figure 2 to parallel operation The waveform diagram of pressure-time or current-vs-time show under existing control mode load suddenly increase when circuit transient response compared with Difference is unfavorable for the stabilization of system.

Summary of the invention

The object of the present invention is to provide a kind of BUCK type power adapters of mixing control, solve the above technical problem;

Technical problem solved by the invention can be realized using following technical scheme:

A kind of BUCK type power adapter of mixing control, wherein including,

One is provided with the operating circuit of energy-storage travelling wave tube;

One switching device group, in a PWM modulation signal or the lower control operating circuit of PFM modulated signal effect in filling Alternately switch between power mode and discharge mode;

One control unit, to be adopted according to a reference voltage, a sampling from the voltage feedback signal of output voltage terminal and one Sample generates the PWM modulation signal or the PFM modulated signal from the current detection signal of the operating circuit;

The current detection signal is generated by a current sampling circuit, and the current sampling circuit is cut in a PWM/PFM It changes under the action of signal and changes the oversampling ratio of electric current.

The BUCK type power adapter of mixing control of the invention, the current sampling circuit include,

One current detecting anode and a current detecting negative terminal;

One differential amplification unit, is equipped with first input end and the second input terminal, and the first input end and the electric current are examined It surveys between anode and connects the first input resistance branch, second input terminal connect the second input electricity with the current detecting negative terminal Hinder branch, one first switch of the first input resistance branch road connection, the second input resistance branch road connection one second Switch, the first switch and the second switch under the action of the PWM/PFM switching signal on or off to change Input resistance size;

One arithmetic element is connect with the output end of the differential amplification unit, for the defeated of the differential amplification unit Signal is handled out, to export the current detection signal.

The BUCK type power adapter of mixing control of the invention, the first input resistance branch include predetermined number and The resistance being connected in series with each other between the first input end and the current detecting anode, the first switch are parallel to The both ends of at least one resistance on or off under the action of the PWM/PFM switching signal.

The BUCK type power adapter of mixing control of the invention, the second input resistance branch include predetermined number and The resistance being connected in series with each other between second input terminal and the current detecting negative terminal, the second switch are parallel to The both ends of at least one resistance on or off under the action of the PWM/PFM switching signal.

The BUCK type power adapter of mixing control of the invention, the first switch and the second switch are all made of biography Defeated door, the control terminal of the transmission gate are connect with the PWM/PFM switching signal.

The BUCK type power adapter of mixing control of the invention, the differential amplification unit include,

First metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor and drain electrode connect, and source electrode connects the first input end;

Second metal-oxide-semiconductor, the source electrode ground connection of second metal-oxide-semiconductor, drain electrode are connect with the drain electrode of first metal-oxide-semiconductor;Grid Connect an offset signal;

Third metal-oxide-semiconductor, the grid of the third metal-oxide-semiconductor are connect with the grid of first metal-oxide-semiconductor, source electrode connection described the Two input terminals;

The source electrode of 4th metal-oxide-semiconductor, the 4th metal-oxide-semiconductor is connect with the source electrode of second metal-oxide-semiconductor, grid and described second The grid of metal-oxide-semiconductor connects, and drain electrode is connect with the drain electrode of the third metal-oxide-semiconductor.

The BUCK type power adapter of mixing control of the invention, further includes a current detecting branch, the current detecting Branch includes,

One detection resistance, the current sampling circuit are parallel to the detection resistance both ends, flow through the inspection to detect The electric current of measuring resistance;

One is controlled the detection control switch of on-off by the PWM modulation signal or the PFM modulated signal.

The BUCK type power adapter of mixing control of the invention, described control unit include,

One error amplifier obtains an error for being compared to the reference voltage with the voltage feedback signal Amplified signal;

One comparator generates one and compares for being compared to the error amplification signal with the current detection signal Signal;

One clock unit, for generating clock signal;

One PWM/PFM modulator, the PWM/PFM modulator connect the clock signal, for relatively believing according to described Number and the clock signal generate the PWM modulation signal or the PFM modulated signal.

The BUCK type power adapter of mixing control of the invention, the PWM/PFM switching signal pass through a logic control Unit generates, and the input terminal of the logic control element connects the error amplification signal, to the error amplification signal It is compared with one second reference voltage, to generate the PWM/PFM switching signal under setting condition.

The utility model has the advantages that due to using the technology described above, when BUCK circuit of the present invention enters PFM mode, reducing electricity The oversampling ratio of stream, so that encountering the case where load increases suddenly, electric current is still in small oversampling ratio state, so that defeated Electric current increases out, and after the short time restores, the oversampling ratio of current sampling circuit returns to normal value, and the transient state of circuit can be improved Response, to ensure that system is stablized.

Detailed description of the invention

Fig. 1 is the internal structure chart of the BUCK type power adapter of the prior art;

Fig. 2 is the current detection circuit figure of the prior art;

Fig. 3 is the waveform diagram of the output end voltage Vout and load current Iload of the prior art;

Fig. 4 is electrical block diagram of the invention;

Fig. 5 is current sampling circuit schematic diagram of the invention;

Fig. 6 is the waveform diagram of output end voltage Vout and load current Iload 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. 4, Fig. 5, Fig. 6, a kind of BUCK type power adapter of mixing control, wherein

Including,

One is provided with the operating circuit of energy-storage travelling wave tube;

One switching device group acts on lower control operating circuit in charging mould in a PWM modulation signal or a PFM modulated signal Alternately switch between formula and discharge mode;

One control unit, to sample the voltage feedback signal Vfb from output voltage terminal according to a reference voltage Vref, one And one sampling from the current detection signal of the operating circuit generate PWM modulation signal or PFM modulated signal;

Current detection signal is generated by a current sampling circuit 3, and current sampling circuit 3 is in a PWM/PFM switching signal Under the action of change electric current oversampling ratio.

The BUCK type power adapter of mixing control of the invention, current sampling circuit include,

An one current detecting anode CSP and current detecting negative terminal CSN;

One differential amplification unit 31 is equipped with first input end and the second input terminal, first input end and current detecting anode The first input resistance branch is connected between CSP, the second input terminal connect the second input resistance branch with current detecting negative terminal CSN, First input resistance branch one first switch 15 of road connection, the second input resistance branch one second switch 16 of road connection, first opens Close 15 and second switch 16 under the action of PWM/PFM switching signal on or off to change input resistance size;

One arithmetic element 32, connect with the output end of differential amplification unit 31, for the output to differential amplification unit 31 Signal is handled, with output electric current measure signal.

The BUCK type power adapter of mixing control of the invention, the first input resistance branch include predetermined number and mutually The resistance being connected in series between first input end and current detecting anode, first switch are parallel to the two of at least one resistance Hold the on or off under the action of PWM/PFM switching signal.

The BUCK type power adapter of mixing control of the invention, the second input resistance branch include predetermined number and mutually The resistance being connected in series between the second input terminal and current detecting negative terminal, second switch are parallel to the two of at least one resistance Hold the on or off under the action of PWM/PFM switching signal.

A kind of specific embodiment, the first input resistance branch series connection first resistor R11 and 3rd resistor R13,3rd resistor The both ends parallel connection first switch 15 of R13, the second input resistance branch series connection second resistance R12 and the 4th resistance R14, the 4th resistance The both ends parallel connection second switch 16 of R14, first switch 15 and second switch 16 can be all made of transmission gate, the control terminal of transmission gate It is connect with PWM/PFM switching signal.

When BUCK circuit enters PFM mode, PWM/PFM switching signal controls first switch 15 and second switch 16 Conducting, 3rd resistor R13 and the 4th resistance R14 are short-circuited respectively, and the gain of circuit reduces, so that current sampling circuit Oversampling ratio reduces, and when so that encountering load increase suddenly, current sample is still in small oversampling ratio state, so that defeated Electric current increases out, and after the short time restores, BUCK circuit restores to PWM mode, and the oversampling ratio of current sampling circuit returns to just Constant value.

The BUCK type power adapter of mixing control of the invention, differential amplification unit include,

The grid of first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 and drain electrode connect, and source electrode connects first input end;

The source electrode of second metal-oxide-semiconductor M2, the second metal-oxide-semiconductor M2 is grounded, and drain electrode is connect with the drain electrode of the first metal-oxide-semiconductor M1;Grid connects Connect an offset signal;

Third metal-oxide-semiconductor M3, the grid of third metal-oxide-semiconductor M3 are connect with the grid of the first metal-oxide-semiconductor M1, the second input of source electrode connection End;

4th metal-oxide-semiconductor M4, the source electrode of the 4th metal-oxide-semiconductor M4 are connect with the source electrode of the second metal-oxide-semiconductor M2, grid and the second metal-oxide-semiconductor The grid of M2 connects, and drain electrode is connect with the drain electrode of third metal-oxide-semiconductor M3.

The BUCK type power adapter of mixing control of the invention, further includes a current detecting branch, current detecting branch Including,

One detection resistance Rb, current sampling circuit 3 are parallel to the both ends detection resistance Rb, flow through detection resistance Rb to detect Electric current;

One is controlled the detection control switch Msen of on-off by PWM modulation signal or PFM modulated signal.

The BUCK type power adapter of mixing control of the invention, operating circuit include,

Charge control branch is connected to input terminal VDD between the node Lx that crosses;

Charge and discharge branch is connected to and crosses between node Lx and output voltage terminal Vout;

Control of discharge branch is connected to and crosses between node Lx and ground terminal GND;

Energy-storage travelling wave tube L is series at charge and discharge branch road;

For operating circuit when charge mode, switching device group controls charge control branch and the conducting of charge and discharge branch, and controls Control of discharge branch processed disconnects, and the electric current for inputting input terminal charges to energy-storage travelling wave tube L;

For operating circuit when discharge mode, switching device group controls control of discharge branch and the conducting of charge and discharge branch, and controls Charge control branch processed disconnects, and makes energy-storage travelling wave tube to output voltage terminal Vout.

A kind of specific embodiment, charge control branch one P-channel metal-oxide-semiconductor Mp of road series connection, one N of control of discharge branch road series connection Channel MOS tube Mn, a capacitor C are connected between output voltage terminal Vout and ground terminal GND, output voltage terminal Vout and ground terminal The resistance R1 and resistance R2 being serially connected are also connected between GND, for the dot being connected between divider resistance at divider node, voltage is anti- Feedback signal is drawn from scheduled divider node.

The BUCK type power adapter of mixing control of the invention, control unit include,

One error amplifier 6 obtains an error for being compared to reference voltage Vref with voltage feedback signal Vfb Amplified signal;

One comparator 2 generates a comparison signal for being compared to error amplification signal with current detection signal;

One clock unit 5, for generating clock signal;

One PWM/PFM modulator 1, PWM/PFM modulator 1 connect clock signal, for believing according to comparison signal and clock Number generate PWM modulation signal or PFM modulated signal.

Control unit further includes a zero cross detection circuit 7, and PWM/PFM modulator 1 is connect with zero cross detection circuit 7.

The BUCK type power adapter of mixing control of the invention, PWM/PFM switching signal pass through a logic control element 9 It generates, the input terminal of logic control element 9 connects error amplification signal, to error amplification signal and one second reference voltage It is compared, to generate PWM/PFM switching signal under setting condition.PWM/PFM modulator 1 is also in logic control element 9 Under the action of switch between PWM modulation signal or PFM modulated signal.Logic control element 9 is by comparing error amplification signal With one second reference voltage, when less than the second reference voltage, when such as 0.4V reference voltage, into PFM mode, when being greater than the second base When quasi- voltage, into PWM mode.PFM also referred to as " economizes on electricity " mode.The converter of work in a power saving mode is in light load electricity PFM mode is used under the conditions of stream, and PWM mode is used under heavier load current conditions.This operating mode makes converter can be with High efficiency is kept in wide in range range of current output.

When BUCK circuit of the present invention enters PFM mode, reduce the oversampling ratio of electric current, increases suddenly so that encountering load The case where adding, electric current is still in small oversampling ratio state, so that output electric current increases, after the short time restores, electric current The oversampling ratio of sample circuit returns to normal value, referring to shown in Fig. 6, the transient response of circuit can be improved, to ensure that system is steady It is fixed.

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 (8)

1. a kind of BUCK type power adapter of mixing control, which is characterized in that including,
One is provided with the operating circuit of energy-storage travelling wave tube;
One switching device group, in a PWM modulation signal or the PFM modulated signal effect lower control operating circuit in charging mould Alternately switch between formula and discharge mode;
One control unit, to be sampled certainly according to a reference voltage, a sampling from the voltage feedback signal of output voltage terminal and one The current detection signal of the operating circuit generates the PWM modulation signal or the PFM modulated signal;
The current detection signal is generated by a current sampling circuit, and the current sampling circuit switches in a PWM/PFM to be believed Change the oversampling ratio of electric current under the action of number;
The current sampling circuit includes,
One current detecting anode and a current detecting negative terminal;
One differential amplification unit is equipped with first input end and the second input terminal, and the first input end and the current detecting are just The first input resistance branch is connected between end, second input terminal connect the second input resistance branch with the current detecting negative terminal Road, one first switch of the first input resistance branch road connection, one second switch of the second input resistance branch road connection, The first switch and second switch on or off under the action of the PWM/PFM switching signal are electric to change input Hinder size;
One arithmetic element is connect with the output end of the differential amplification unit, for the output letter to the differential amplification unit It number is handled, to export the current detection signal;
The first input resistance branch series connection first resistor and 3rd resistor, the both ends parallel connection first switch of 3rd resistor, the Two input resistance branches are connected second resistance and the 4th resistance, the both ends parallel connection second switch of the 4th resistance, first switch and the The control terminal of two switches is connect with the PWM/PFM switching signal;
When the BUCK type power adapter enters PFM mode, the PWM/PFM switching signal control described first is opened Pass is connected with the second switch, and the 3rd resistor and the 4th resistance are short-circuited respectively, and the gain of circuit reduces, thus So that the oversampling ratio of current sampling circuit reduces, when so that encountering load increase suddenly, current sample is still in small sampling Ratio state, so that output electric current increases, after the short time restores, the BUCK type power adapter restores to PWM mould The oversampling ratio of formula, current sampling circuit returns to normal value.
2. a kind of BUCK type power adapter of mixing control according to claim 1, which is characterized in that described first is defeated Enter resistance branch to include predetermined number and be connected in series with each other between the first input end and the current detecting anode Resistance, the first switch is parallel to the both ends of at least one resistance under the action of the PWM/PFM switching signal On or off.
3. a kind of BUCK type power adapter of mixing control according to claim 1, which is characterized in that described second is defeated Enter resistance branch to include predetermined number and be connected in series with each other between second input terminal and the current detecting negative terminal Resistance, the second switch is parallel to the both ends of at least one resistance under the action of the PWM/PFM switching signal On or off.
4. a kind of BUCK type power adapter of mixing control according to claim 1, which is characterized in that described first opens It closes and the second switch is all made of transmission gate, the control terminal of the transmission gate is connect with the PWM/PFM switching signal.
5. a kind of BUCK type power adapter of mixing control according to claim 1, which is characterized in that the difference is put Big unit includes,
First metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor and drain electrode connect, and source electrode connects the first input end;
Second metal-oxide-semiconductor, the source electrode ground connection of second metal-oxide-semiconductor, drain electrode are connect with the drain electrode of first metal-oxide-semiconductor;Grid connection One offset signal;
Third metal-oxide-semiconductor, the grid of the third metal-oxide-semiconductor are connect with the grid of first metal-oxide-semiconductor, and source electrode connection described second is defeated Enter end;
The source electrode of 4th metal-oxide-semiconductor, the 4th metal-oxide-semiconductor is connect with the source electrode of second metal-oxide-semiconductor, grid and the 2nd MOS The grid of pipe connects, and drain electrode is connect with the drain electrode of the third metal-oxide-semiconductor.
6. a kind of BUCK type power adapter of mixing control according to claim 1, which is characterized in that further include an electricity Detection branch is flowed, the current detecting branch includes,
One detection resistance, the current sampling circuit are parallel to the detection resistance both ends, flow through the detection electricity to detect The electric current of resistance;
One is controlled the detection control switch of on-off by the PWM modulation signal or the PFM modulated signal.
7. a kind of BUCK type power adapter of mixing control according to claim 1, which is characterized in that the control is single Member includes,
One error amplifier obtains error amplification for being compared to the reference voltage with the voltage feedback signal Signal;
One comparator generates a comparison signal for being compared to the error amplification signal with the current detection signal;
One clock unit, for generating clock signal;
One PWM/PFM modulator, the PWM/PFM modulator connect the clock signal, for according to the comparison signal and The clock signal generates the PWM modulation signal or the PFM modulated signal.
8. a kind of BUCK type power adapter of mixing control according to claim 7, which is characterized in that the PWM/ PFM switching signal is generated by a logic control element, and the input terminal of the logic control element connects the error amplification letter Number, to be compared to the error amplification signal with one second reference voltage, described in being generated under setting condition PWM/PFM switching signal.
CN201410844542.7A 2014-12-30 2014-12-30 A kind of BUCK type power adapter of mixing control CN105811756B (en)

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CN109856445B (en) * 2019-03-21 2020-11-24 黄河科技学院 Current sampling circuit for BUCK converter capable of eliminating direct current error

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CN102025266A (en) * 2009-06-18 2011-04-20 力博特公司 Numeric control method for liquid level control (LLC) resonant conversion circuit
CN103412168A (en) * 2013-09-09 2013-11-27 扬州市万泰电器厂有限公司 High-precision current sampling circuit of intelligent electric meter

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JP5481926B2 (en) * 2009-05-18 2014-04-23 富士通セミコンダクター株式会社 Power supply control device, power supply device, and power supply control method
JP6207871B2 (en) * 2013-04-17 2017-10-04 ルネサスエレクトロニクス株式会社 Semiconductor device and inverter system

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Publication number Priority date Publication date Assignee Title
CN102025266A (en) * 2009-06-18 2011-04-20 力博特公司 Numeric control method for liquid level control (LLC) resonant conversion circuit
CN103412168A (en) * 2013-09-09 2013-11-27 扬州市万泰电器厂有限公司 High-precision current sampling circuit of intelligent electric meter

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