CN106953515B - A kind of underloading detection circuit of automatic adjusument driving voltage - Google Patents

A kind of underloading detection circuit of automatic adjusument driving voltage Download PDF

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Publication number
CN106953515B
CN106953515B CN201710176717.5A CN201710176717A CN106953515B CN 106953515 B CN106953515 B CN 106953515B CN 201710176717 A CN201710176717 A CN 201710176717A CN 106953515 B CN106953515 B CN 106953515B
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voltage
lld
clamp
driving
load
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CN201710176717.5A
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CN106953515A (en
Inventor
宁宁
梁孝亿
段开锋
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The present invention relates to the regulation technology field of driving voltage in Switching Power Supply, specially a kind of underloading detection circuit of automatic adjusument driving voltage.Including clamp voltage generation module, level switch module and invalid control module is enabled.Clamp voltage generation module exports clamp voltage signal CLAMP and controls driving circuit, the output voltage of clamper driving circuit；It enables invalid control module and exports enabled invalid signals, driving circuit output is drawn as minimum level, and turning off chip interior can breaking circuit；Level switch module generates the signal for being lower than supply voltage, the high pressure ground potential as clamp voltage generation module.The present invention exports adjustable driving voltage and enabled invalid control signal, is optimization system efficiency under underloading or no-load condition to load by load detecting；Simultaneously when power switch tube state switches, driving voltage regulation technology can improve the performance and stability of system.

Description

A kind of underloading detection circuit of automatic adjusument driving voltage
Technical field
The present invention relates to the regulation technology field of driving voltage in Switching Power Supply, in particular to a kind of automatic adjusument driving The underloading detection circuit of voltage.
Background technique
Recently as continuously improving for microelectric technique, people are continuous for micro energy lose, the demand of energy-saving product Increase, therefore DC-DC dc-dc converter is promoted to develop to high efficient and power-saving direction.
Under conditions of medium load is with being fully loaded with, synchronous rectification can improve the conversion effect of switch power supply system significantly Rate；However under conditions of load becomes underloading or zero load, the drive loss of driving switch pipe becomes main source of power loss, The transfer efficiency of switch power supply system can be reduced significantly at this time.
Although some of schemes propose underloading crossing detector circuit, but it realizes that circuit is too complicated, while negative It carries as driving voltage cannot be adjusted at light load.
Summary of the invention
In view of the above problems, being reduced the present invention provides a kind of underloading detection circuit of automatic adjusument driving voltage Drive loss under underloading or no-load condition, improves the transfer efficiency of switch power supply system.
The underloading detection circuit of the automatic adjusument driving voltage, as shown in Figure 1, including clamp voltage generation module, electricity Flat conversion module and enable invalid control module.
The input port of the clamp voltage generation module connects peak detection circuit, and output clamp voltage signal CLAMP is extremely Enable invalid control module and driving circuit；When loading for zero load, work at this time in the normal mode, the clamp voltage of output Signal control drive circuit, the output voltage of clamper driving circuit；
The level switch module generates the signal for being lower than supply voltage, the high pressure as clamp voltage generation module it is electric Position；
It is described to enable invalid control module, it is zero load when loading, is worked at this time in invalid mode, exports and enable to believe in vain Number, driving circuit output is drawn as minimum level, and will turn off chip interior can breaking circuit, power consumption is reduced to minimum.
When load is not zero load, according to the condition of output loading, driving circuit output voltage can be followed and is adjusted, i.e., defeated Out when load reduction, driving circuit output voltage is decreased.Under fully loaded transportation condition, power switch tube is carried out by high driving voltage Driving carrys out optimization system performance and reduces conducting power consumption；Under the conditions of underloading, power switch tube does not need high driving voltage to reach To so low channel conducting resistance.This automatic adjusument driving voltage technology can optimize under conditions of load is is lightly loaded System effectiveness reduces power consumption, and especially when using the power switch tube for having very big input parasitic capacitance, effect is more significant.
When load is zero load, the enabled invalid control signal of underloading detection circuit output draws the output voltage of driving circuit For potential minimum, while reducing the power loss in piece.The stability of system and avoid the influence of noise to increase, into The threshold voltage for exiting enabled invalid mode should have certain sluggishness.
In load sudden change, the soft conducting of the moment of the parasitic body diode between power switch tube and drop are in power switch pipe trench The ohmically pressure drop in road can improve the stability of system.I.e. when the state of power switch tube enters and exit normal mode or enables Invalid mode, the present invention can also improve system performance.
When the clamp voltage generation module input is by the port LLD and VCC port controlling；Peak detection circuit will load electricity Pressure is input to the port VCC, and sampling partial pressure is input to the port LLD, as shown in Figure 2.Wherein solid line is driving circuit output voltage wave Shape, dotted line are current drain waveform.Work as VCCAnd VLLDDifference restore voltage threshold V enabledLLD_RECVoltage threshold is detected with underloading Value VLLD_MAXBetween when, driving circuit output voltage and VCCAnd VLLDDifference it is in a linear relationship.Work as VCCAnd VLLDDifference be lower than Enabled dead voltage threshold value VLLD_DIS, chip will be into invalid mode, and the power loss of chip can be reduced rapidly at this time.Work as VCC And VLLDDifference be higher than VLLD_REC, invalid mode can terminate, and enter normal mode of operation.
In conclusion the present invention exports adjustable driving voltage and enabled invalid control signal, to negative by load detecting Carrying is optimization system efficiency under underloading or no-load condition；Simultaneously when the switching of power switch tube state, driving voltage regulation technology energy The performance and stability of raising system.
Detailed description of the invention
Fig. 1 is the underloading detection circuit schematic diagram of automatic adjusument driving voltage；
Fig. 2 is driving circuit output voltage with LLD variation waveform and current drain performance plot；
Fig. 3 is the system block diagram of automatic adjusument driving voltage of the present invention；
Fig. 4 is peak detection circuit schematic diagram；
Fig. 5 is level switch module schematic diagram of the present invention；
Fig. 6 is clamp voltage generation module schematic diagram of the present invention；
Fig. 7 is that the present invention enables invalid control module schematic diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Peak detection circuit is detected to load voltage and is input to the port VCC, while being divided to load voltage Sampling is input to the port LLD, using underloading detection circuit output clamp voltage signal control upper end driving circuit and enabled nothing It imitates signal and controls lower end driving circuit, respectively drive upper end NMOS tube and lower end NMOS tube, output driving modulation voltage, control sheet The grid end of external power switching tube.Wherein underloading detection circuit includes that clamp voltage generates and enable invalid control function.Clamper electricity Pressure generates function by resistance R4、R5、R6、R7, capacitor C4And C5, difference amplifier OP and level translator are realized.VCCAnd VLLD Difference by difference amplifier OP generate driving upper end driving circuit adjustable clamp voltage.Simultaneously as VCCAnd VLLDFor High voltage, and common process gate source voltage pressure resistance is 5V, it is therefore necessary to height is provided using level translator for difference amplifier OP Press ground potential.Invalid control function is enabled to be realized by comparator COMP and alternative circuit.The clamp voltage of generation is passed through COMP is compared with a reference voltage, is generated enabled invalid control signal, is drawn driving voltage by lower end driving circuit For minimum level, and turn off the partial circuit of chip.
As shown in figure 4, using diode D1, resistance R1、R2、R3, capacitor C2And C3Constitute simple and effective peak detection electricity The grade of load is detected on road.As power switch tube M1When conducting, C2It will do it charging, cause VCCAnd VLLDBetween difference Increase.When the load decreases, the turn-on time of switching tube M1 can be smaller and smaller, i.e. time for flowing through of electric current is smaller and smaller.To C2 The time of charging is shorter and shorter, C2On voltage will reduce and (pass through R2And R3It discharges).In C2On the voltage that becomes smaller can make LLD port voltage is towards VCCVariation, and lead to VCCAnd VLLDDifference become zero, at this time be lightly loaded detection circuit output voltage meeting Directly affect driving output voltage DRV reduces since maximum value.Resistance R2And R3As voltage value adjustment circuit, cooperate simultaneously Capacitor C3Low-pass filter is constituted, C is filtered2On high frequency ripple, low-pass filter slowed down switching tube M simultaneously1State transformation Speed.In addition to this, the time constant of switch state is higher than the time constant of feedback control loop.As shown in figure 5, level turns Change the mold block, including PMOS tube M1、M2、M3、M4、M5、M6, NMOS tube M7、M8, resistance R1、R2、R3.The level switch module principle are as follows: BIAS is the current offset that external circuit provides, and passes through M7And M8The current mirror of current mirror is M8Branch provides electricity where pipe Stream.Supply voltage VCCThe PMOS tube M connected by chain of diodes1、M2、M3, it is power tube PMOS M6Grid end provide VCC- 5-VthVoltage, due to M6Breadth length ratio be 20/1, pipe sizing is very big, so M6Gate source voltage be essentially Vth, thus VCC_5Output end voltage is VCC-5.With M6The pipe M of two diodes connection of pipe parallel connection4、M5Effect is: working normally shape When state, two pipes be it is idle, only work as VCC_5Super-high-current pulse is flowed into, M can be made6The source overtension of pipe, due to M6Grid end has little time to change, and gate source voltage may be made excessive, and M at this time4And M5Pipe conducting can make M6Grid end improves, and keeps grid source electric It forces down in maximum breakdown voltage, to M6Pipe shields.In VCC_5When there is no electric current inflow, resistance R2And R3There is provided one Small electric current makes M6Conducting, and it is not VCC_5Output is too low, does not have the effect of level conversion.
As shown in fig. 6, clamp voltage generation module, including PMOS tube M1、M2、M3、M4、M5、M6, NMOS tube M7、M8、M9、 M10, resistance R1、R2、R3, diode D1, capacitor C1, difference amplifier OP1、OP2And level translator.Operational amplifier OP1 Output is connected to M1Grid end, M1Leakage connection M3Source constitute cascode structure, M3Drain terminal be connected to current mirror M8Grid end And drain terminal, then pass through M7Current mirror in resistance R2Upper generation voltage is to OP1Inverting input terminal, this loop constitute negative-feedback. When feedback reaches stable state, OP1Inverting input terminal voltage be equal to LLD port voltage, flow through M7Size of current be (VCC- VLLD)/R2, size of current is equal to M1And M3The electric current of branch road, and M2And M4The current mirror M of branch1And M3Branch current, Therefore in VCLAMPEnd generates (VCC-VLLD)·R3/R2Voltage, which will be with VCCAnd VLLDDifference become larger and become larger.Difference Amplifier OP2And M6Effect be: work as M2And M4Current flowing resistance R on branch3Generated voltage is greater than OP2Non-inverting input terminal Reference voltage VREFWhen, pass through OP2And M6The negative-feedback regu- lation of composition, VCLAMPFinally it is stabilized in reference voltage VREF, on the contrary If M2And M4Current flowing resistance R on branch3Generated voltage is inherently less than reference voltage VREF, then M6Shutdown, OP2With M6The negative-feedback of composition does not act on, VCLAMPExport (VCC-VLLD)·R3/R2.BIAS is foreign current biasing, passes through current mirror M9 And M10For M5Electric current, M are provided3And M5Negative-feedback is constituted, respectively respective grid end provides bias voltage.Level translator is poor Divide amplifier OP1High pressure ground potential is provided.Resistance R1With capacitor C1Constitute filter network, filter out the pulse inputted by the port LLD and Burr.Capacitor D1Effect is: playing ESD protection to the port LLD.
As shown in fig. 7, enabling invalid control module, comparator COMP output end passes through phase inverter INV1And INV2Control passes Defeated door TG1And TG1, by different reference voltage VREF1And VREF2The non-inverting input terminal of COMP is accessed, wherein VREF1Higher than VREF2.When VCLAMPWhen becoming low-voltage from high voltage, output DIS maintains low level, and (comparator COMP homophase input terminates V at this timeREF2), directly It is lower than V to inputREF2When, DIS just becomes high level；Work as VCLAMPWhen becoming high voltage from low-voltage, output DIS maintains high level (comparator COMP homophase input terminates V at this timeREF1), until input is higher than VREF1When, DIS just becomes low level.This band is sluggish Comparator, can effectively avoid noise influence and increase system stability.
As shown in the above, the present invention checks using peak detection circuit load voltage and divides sampling, warp Underloading detection circuit output clamp voltage signal and enabled invalid signals are crossed, the output voltage of driving circuit is controlled with this.This The circuit of invention is not only simple, but also the size in load to be adjustable driving circuit output voltage at light load.

Claims (3)

1. a kind of underloading detection circuit of automatic adjusument driving voltage, including clamp voltage generation module, level switch module, Enable invalid control module, it is characterised in that:
The input port of the clamp voltage generation module connects peak detection circuit, and output clamp voltage signal CLAMP is to enabled Invalid control module and driving circuit；When loading for zero load, work at this time in the normal mode, the clamp voltage signal of output Control driving circuit, the output voltage of clamper driving circuit；
The level switch module generates the signal for being lower than supply voltage, the high pressure ground potential as clamp voltage generation module；
It is described to enable invalid control module, it is zero load when loading, is worked at this time in invalid mode, exports enabled invalid signals DIS, Driving circuit output is drawn as minimum level, and will turn off chip interior can breaking circuit, power consumption is reduced to minimum；
The clamp voltage generation module, when load is not unloaded, driving circuit output voltage can be followed and is adjusted, i.e., defeated Out when load reduction, driving circuit output voltage is decreased.
2. the underloading detection circuit of automatic adjusument driving voltage as described in claim 1, it is characterised in that: described enabled invalid The entrance of control module and exit threshold voltage exist it is sluggish.
3. the underloading detection circuit of automatic adjusument driving voltage as described in claim 1, it is characterised in that: the clamp voltage Generation module includes the port LLD and the port VCC；Load voltage is input to the port VCC, sampling partial pressure input by peak detection circuit To the port LLD；Load voltage Vcc and sampling partial pressure VLLDDifference restore voltage threshold V enabledLLD-RECWith underloading detection electricity Press threshold value VLLD-MAXBetween when, driving circuit output voltage and Vcc and VLLDDifference it is in a linear relationship；As Vcc and VLLDDifference Value is lower than enabled dead voltage threshold value VLLD-DIS, chip enters invalid mode, and the power loss of chip can be reduced rapidly at this time；When Vcc and VLLDDifference be higher than VLLD-REC, invalid mode terminates, and enters normal mode of operation.
CN201710176717.5A 2017-03-23 2017-03-23 A kind of underloading detection circuit of automatic adjusument driving voltage Expired - Fee Related CN106953515B (en)

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CN109496018A (en) * 2018-12-27 2019-03-19 无锡奥利杰科技有限公司 A kind of loop current control circuit and controllable silicon dimmer application circuit
CN111416505B (en) * 2020-04-14 2021-05-11 上海顺久电子科技有限公司 Switching power supply converter
CN114337272B (en) * 2022-01-04 2024-02-23 上海南芯半导体科技股份有限公司 Light load mode maintaining circuit for DC-DC converter and control method thereof

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CN102468740A (en) * 2010-11-19 2012-05-23 无锡芯朋微电子有限公司 Method for modulating high-efficiency and self-adaptive oscillation frequency of switching power supply
CN103605035A (en) * 2013-12-02 2014-02-26 绍兴光大芯业微电子有限公司 No-load detection circuit structure of self-adaptive switching power supply
CN104242644A (en) * 2014-10-11 2014-12-24 成都芯源系统有限公司 Control circuit and control method for switching converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102158080A (en) * 2010-03-02 2011-08-17 成都芯源系统有限公司 Voltage converter and control method thereof
CN102468740A (en) * 2010-11-19 2012-05-23 无锡芯朋微电子有限公司 Method for modulating high-efficiency and self-adaptive oscillation frequency of switching power supply
CN103605035A (en) * 2013-12-02 2014-02-26 绍兴光大芯业微电子有限公司 No-load detection circuit structure of self-adaptive switching power supply
CN104242644A (en) * 2014-10-11 2014-12-24 成都芯源系统有限公司 Control circuit and control method for switching converter

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Granted publication date: 20190510