CN109347303A - The monitoring device and method of DCM buck-boost converter output capacitance - Google Patents
The monitoring device and method of DCM buck-boost converter output capacitance Download PDFInfo
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- CN109347303A CN109347303A CN201710631104.6A CN201710631104A CN109347303A CN 109347303 A CN109347303 A CN 109347303A CN 201710631104 A CN201710631104 A CN 201710631104A CN 109347303 A CN109347303 A CN 109347303A
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Classifications
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
Abstract
The invention discloses the monitoring devices and method of a kind of DCM buck-boost converter output capacitance.The device includes One Buck-Boost converter body main power circuit, driving circuit, display unit and signal processing module, and wherein signal processing module includes power circuit control unit, switching frequency fsComputing unit, duty ratio DyComputing unit, output voltage trigger sampling unit, capacitor ESR and C computing unit；Method are as follows: by the PWM driving pulse signal of detection switch pipe, through duty ratio DyComputing unit obtains duty ratio, through switching frequency fsComputing unit obtains the switching frequency of converter, output voltage triggers sampling unit on the one hand detection output voltage average value, on the other hand triggering sampling obtains the instantaneous value of output voltage, above-mentioned data are sent into capacitor ESR and C computing unit, obtain the value of the current ESR and C of output filter capacitor in One Buck-Boost converter body.The present invention is not necessarily to current sensor, does not influence the normal work of converter, the life prediction for capacitor and power supply provides foundation.
Description
Technical field
The invention belongs to the monitoring technical field in electrical energy changer, especially a kind of DCM buck-boost converter output
The monitoring device and method of capacitor ESR and C.
Background technique
Switching Power Supply is applied very extensive in daily production and life.Relatively stable output voltage in order to obtain, needs
High-frequency noise is effectively filtered out using capacitor.Converter worked after a period of time, the capacitance (Capacitance, C) of capacitor and waited
Effect series resistance (Equivalent Series Resistance, ESR) can change, and when the variable quantity is larger, then should
Condenser failure, the failure of capacitor will will cause the operation troubles of power supply and system.It is depressured (Buck), boosting (Boost), buck
(Buck-Boost) converter is three kinds of most basic switching power converters, and other converters can be by these three transformation
Device development.Wherein, DCM (Discontinuous Conduction Mode, discontinuous conduct mode) Buck-Boost is converted
Device is widely used in fields such as computer power supply, communication power supply, aerospaces, therefore monitors DCM One Buck-Boost converter body
The ESR and C of output filter capacitor predict that its service life is extremely important.
Domestic and foreign scholars have made certain research to the parameter monitoring of electrolytic capacitor in Switching Power Supply in recent years, can mainly divide
For two classes, respectively off-line type and online.Arrestment is needed to run when monitoring electrolytic capacitor using off-line type, and it is online
Although monitoring is run without arrestment, its existing switching tube current detecting letter in addition to Controlled in Current Mode and Based can use
Extra, it is also necessary to increase current sensor to detect the electric currents such as capacitor, inductance.
Summary of the invention
The purpose of the present invention is to provide the monitoring device of a kind of DCM buck-boost converter output capacitance ESR and C and sides
Method, so that the variation of the capacitance C of real-time monitoring equivalent series resistance ESR and capacitor, carries out the service life of electrolytic capacitor and power supply
Accurate Prediction.
The technical solution for realizing the aim of the invention is as follows: a kind of monitoring device of DCM buck-boost converter output capacitance,
Including One Buck-Boost converter body main power circuit, driving circuit, display unit and signal processing module；
The signal processing module includes power circuit control unit, switching frequency fsComputing unit, duty ratio DyIt calculates single
Member, output voltage trigger sampling unit, capacitor ESR and C computing unit；
The One Buck-Boost converter body main power circuit includes input voltage source Vin, switching tube Qb, sustained diodeb、
Filter inductance L, output filter capacitor and load RL, the output filter capacitor includes equivalent series resistance ESR and capacitor C, institute
State switching tube QbDrain electrode and voltage source VinAnode connection, the one end filter inductance L respectively with switching tube QbSource electrode, afterflow two
Pole pipe DbCathode connection, the filter inductance L other end and voltage source VinCathode connection, sustained diodebAnode respectively with
One end of equivalent series resistance ESR, load RLOne end connection, one end of the other end of equivalent series resistance ESR and capacitor C connect
It connects, the other end and load R of capacitor CLThe other end with voltage source VinCathode connection, load RLBoth ends are output voltage vo；
The input terminal of the power circuit control unit voltage source with One Buck-Boost converter body main power circuit respectively
VinWith output voltage voConnection, the pwm signal of power circuit control unit output end are respectively connected to switching frequency fsComputing unit
With duty ratio DyComputing unit, the output voltage v of One Buck-Boost converter body main power circuitoIt is defeated with power circuit control unit
The pwm signal of outlet accesses output voltage triggering sampling unit, switching frequency fsComputing unit, duty ratio DyIt is computing unit, defeated
The output end of voltage triggered sampling unit accesses capacitor ESR and C computing unit, the output end of capacitor ESR and C computing unit out
Access display unit；
The input terminal of the driving circuit is connect with the pwm signal of power circuit control unit output end, driving circuit
Output end accesses switching tube QbGate pole.
Further, the signal processing module is dsp chip TMS320F28335.
Further, the display unit is 1602 liquid crystal displays.
A kind of monitoring method of DCM buck-boost converter output capacitance, comprising the following steps:
Step 1, power circuit control unit, switching frequency f are created in signal processing modulesComputing unit, duty ratio Dy
Computing unit, output voltage trigger sampling unit, capacitor ESR and C computing unit；
Step 2, the power circuit control unit of signal processing module acquires One Buck-Boost converter body main power circuit
Output voltage voWith input voltage source Vin, obtain pwm signal and through driving circuit driving switch pipe Qb；
Step 3, the pwm signal that power circuit control unit exports is respectively fed to switching frequency fsComputing unit and duty
Compare DyComputing unit, through switching frequency fsComputing unit processing obtains the current switching frequency f of converters, through duty ratio DyIt calculates
Cell processing obtains the current duty ratio D of convertery；
Step 4, the output of the pwm signal and One Buck-Boost converter body main power circuit of the output of power circuit control unit
Voltage voIt is sent into output voltage triggering sampling unit simultaneously, handles to obtain the wink of output voltage through output voltage triggering sampling unit
Duration vo(0)、vo(DyTs/ 2) and the average value V of output voltageo；TsFor converter switches period, DyFor the duty ratio of converter,
voIt (0) is the corresponding instantaneous output voltage of pwm signal rising edge time, vo(DyTs/ 2) for pwm signal rising edge and failing edge it
Between the corresponding instantaneous output voltage of middle point moment；
Step 5, the switching frequency f that will be obtaineds, duty ratio DyAnd the instantaneous value v of output voltageo(0)、vo(DyTs/2)
With the average value V of output voltageoIt is sent into capacitor ESR and C computing unit and carries out integrated treatment, obtain in One Buck-Boost converter body
The value of output filter capacitor current equivalent series resistance ESR and capacitor C；
Step 6, the value of resulting equivalent series resistance ESR and capacitor C is sent by capacitor ESR and C computing unit shows list
First real-time display.
Further, the formula of ESR and C computing unit described in step 5 (7) integrated treatment is as follows:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, and L is inductance value, fsFor converter switches frequency
Rate, TsFor converter switches period, VoFor output voltage average value, DyFor the duty ratio of converter, vo(0) rise for pwm signal
Along moment corresponding instantaneous output voltage, vo(DyTs/ 2) the middle point moment between pwm signal rising edge and failing edge is corresponding
Instantaneous output voltage.
Compared with prior art, the present invention its remarkable advantage are as follows: (1) do not influence the normal work of converter；(2) online prison
ESR the and C value of capacitor is surveyed, the life prediction for capacitor and power supply provides foundation；(3) current sensor and its auxiliary circuit are not necessarily to
Capacitance current is detected, the difficulty of parameter monitoring is reduced.
Detailed description of the invention
Fig. 1 is the working waveform figure in DCM One Buck-Boost converter body switch periods.
Fig. 2 is the structural schematic diagram of the monitoring device of DCM buck-boost converter output capacitance ESR and C of the present invention.
Wherein: VinInput voltage, IinInput current, iLInductive current, iCCapacitance current, IoExport electric current, voIt is defeated
Voltage out, VoOutput voltage average value, QbSwitching tube, DbDiode, L- inductance, C- output filter capacitor value, ESR- are equivalent
Series impedance, RLLoad, VgsSwitching tube QbDriving voltage, DyDuty ratio, DRInductive current is from peak-fall to 0th area
Interior duty ratio corresponding, t- time, TsConverter switches period, fsConverter switches frequency, Δ ILInductive current ripple peak
Peak value, vESRVoltage on equivalent series resistance, vCVoltage on capacitor.
Specific embodiment
With reference to the accompanying drawing and specific embodiment makes further description to the present invention.
The present invention design one kind work in discontinuous mode (Discontinuous Conduction Mode,
DCM the monitoring device and method of buck (Buck-Boost) converter output capacitance ESR and C).
1, theory deduction:
Fig. 1 is the work wave in DCM One Buck-Boost converter body switch periods.As switching tube QbWhen conducting, diode
DbCut-off, the voltage at the both ends inductance L are Vin, inductive current iLWith VinThe slope linear rise of/L；As diode DbWhen shutdown,
Inductive current iLPass through diode DbAfterflow, the voltage at the both ends inductance L is-V at this timeo, inductive current iLWith VoThe slope of/L declines；
In (Dy+DR)TsMoment, inductive current fall to 0, until the switch periods terminate.
Inductive current iLExpression formula in one cycle is as follows:
Wherein VinFor input voltage, VoFor output voltage average value, L is inductance value, fsFor One Buck-Boost converter body
Switching frequency, DyFor the duty ratio of switching tube, DRFor inductive current duty ratio corresponding, T in from peak-fall to 0 sectionsFor
The switch periods of One Buck-Boost converter body, t are the time.
In switch periods, equation can be obtained according to inductance voltage-second balance:
DyVinTs=DRVoTs (2)
Ignore transducer loose, then input power is equal to output power:
Current average I is exported as available from the above equationoExpression formula:
Capacitance current iCExpression formula are as follows:
Capacitance current iCPressure drop on capacitor C and equivalent series resistance ESR is respectively vC(t) and vESR(t), waveform is such as
Voltage v on Fig. 1, equivalent series resistance ESRESR(t) waveform and capacitance current iC(t) waveform shape is consistent, expression formula are as follows:
Capacitance voltage vC(t) with capacitance current iC(t) relationship such as following formula:
Wherein VCIt (0) is the corresponding capacitance voltage of zero moment.
In a switch periods, output voltage average value are as follows:
V is obtained by formula (4) and formula (8)c(0) expression formula::
From attached drawing 1 as can be seen that the voltage on capacitor C is capacitance voltage vC(t) with ESR voltage vESR(t) synthesis electricity
Pressure, the voltage and capacitance current iC, capacitor C, equivalent series resistance ESR it is related, in actual circuit, according to detecting resulting ripple
Electric current iC(t) and resultant voltage vC(t)+vESR(t) information counter can release capacitor C and equivalent series resistance ESR value.For this purpose,
Investigate 0 moment and DyTs/ 2 two moment points.
Capacitance voltage vC(t) with equivalent series resistance ESR voltage vESR(t) resultant voltage is output voltage instantaneous value vo
(t), it according to formula (6), formula (7) and formula (9), can obtain:
Formula is expressed according to the output voltage of formula (10), removes direct current average value VoOutput voltage AC compounent v can be obtained
It is as follows:
0 moment and DyTs/ 2 moment, the AC compounent of output voltageIt is respectively as follows:
DCM One Buck-Boost converter body output filter capacitor ESR can be obtained according to formula (2), formula (4), formula (12) and formula (13)
With the monitoring method of C:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, and L is inductance value, fsFor converter switches frequency
Rate, TsFor converter switches period, VoFor output voltage average value, DyFor the duty ratio of converter, DRIt is inductive current from peak value
Drop to duty ratio corresponding in 0 section.voIt (0) is the corresponding instantaneous output voltage of pwm signal rising edge time, vo(DyTs/2)
The corresponding instantaneous output voltage of middle point moment between pwm signal rising edge and failing edge.
2, the monitoring device and method of DCM buck-boost converter output capacitance ESR and C of the present invention
In conjunction with Fig. 2, the monitoring device of DCM buck-boost converter output capacitance ESR and C of the present invention, including Buck-Boost
Converter main power circuit 1, driving circuit 3, display unit 8 and signal processing module；
The signal processing module includes power circuit control unit 2, switching frequency fsComputing unit 4, duty ratio DyIt calculates
Unit 5, output voltage trigger sampling unit 6, capacitor ESR and C computing unit 7；
The One Buck-Boost converter body main power circuit 1 includes input voltage source Vin, switching tube Qb, freewheeling diode
Db, filter inductance L, output filter capacitor and load RL, the output filter capacitor includes equivalent series resistance ESR and capacitor C,
The switching tube QbDrain electrode and voltage source VinAnode connection, the one end filter inductance L respectively with switching tube QbSource electrode, afterflow
Diode DbCathode connection, the filter inductance L other end and voltage source VinCathode connection, sustained diodebAnode difference
One end, load R with equivalent series resistance ESRLOne end connection, one end of the other end of equivalent series resistance ESR and capacitor C
Connection, the other end and load R of capacitor CLThe other end with voltage source VinCathode connection, load RLBoth ends are output voltage
vo；
The input terminal of the power circuit control unit 2 voltage with One Buck-Boost converter body main power circuit 1 respectively
Source VinWith output voltage voConnection, the pwm signal of 2 output end of power circuit control unit are respectively connected to switching frequency fsIt calculates single
4 and duty ratio D of memberyComputing unit 5, the output voltage v of One Buck-Boost converter body main power circuit 1oIt is controlled with power circuit single
The pwm signal of first 2 output ends accesses output voltage triggering sampling unit 6, switching frequency fsComputing unit 4, duty ratio DyIt calculates
The output end that unit 5, output voltage trigger sampling unit 6 accesses capacitor ESR and C computing unit 7, and capacitor ESR and C calculate single
The output end of member 7 accesses display unit 8；
The input terminal of the driving circuit 3 is connect with the pwm signal of 2 output end of power circuit control unit, driving circuit 3
Output end access switching tube QbGate pole.
The signal processing module is dsp chip TMS320F28335.The display unit 8 is 1602 liquid crystal displays.
A kind of monitoring method of DCM buck-boost converter output capacitance, comprising the following steps:
Step 1, power circuit control unit 2, switching frequency f are created in signal processing modulesComputing unit 4, duty
Compare DyComputing unit 5, output voltage trigger sampling unit 6, capacitor ESR and C computing unit 7；
Step 2, the power circuit control unit 2 of signal processing module acquires One Buck-Boost converter body main power circuit 1
Output voltage voWith input voltage source Vin, obtain pwm signal and through 3 driving switch pipe Q of driving circuitb；
Step 3, the pwm signal that power circuit control unit 2 exports is respectively fed to switching frequency fsIt computing unit 4 and accounts for
Sky ratio DyComputing unit 5, through switching frequency fsThe processing of computing unit 4 obtains the current switching frequency f of converters, through duty ratio Dy
The processing of computing unit 5 obtains the current duty ratio D of convertery；
Step 4, the pwm signal and One Buck-Boost converter body main power circuit 1 of the output of power circuit control unit 2 is defeated
Voltage v outoIt is sent into output voltage triggering sampling unit 6 simultaneously, obtains output voltage through the output voltage triggering processing of sampling unit 6
Instantaneous value vo0、voDyTs/ 2 and output voltage average value Vo；TsFor converter switches period, DyFor the duty ratio of converter,
vo0 is the corresponding instantaneous output voltage of pwm signal rising edge time, voDyTs/ 2 between pwm signal rising edge and failing edge
The corresponding instantaneous output voltage of middle point moment；
Step 5, the switching frequency f that will be obtaineds, duty ratio DyAnd the instantaneous value v of output voltageo0、voDyTs/ 2 and defeated
The average value V of voltage outoIt is sent into capacitor ESR and C computing unit 7 and carries out integrated treatment, obtain defeated in One Buck-Boost converter body
The value of filter capacitor current equivalent series resistance ESR and capacitor C out；
Step 6, the value of resulting equivalent series resistance ESR and capacitor C is sent by capacitor ESR and C computing unit 7 shows list
First 8 real-time displays.
The formula of 7 integrated treatment of ESR and C computing unit described in step 5 is as follows:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, and L is inductance value, fsFor converter switches frequency
Rate, TsFor converter switches period, VoFor output voltage average value, DyFor the duty ratio of converter, vo(0) rise for pwm signal
Along moment corresponding instantaneous output voltage, vo(DyTs/ 2) the middle point moment between pwm signal rising edge and failing edge is corresponding
Instantaneous output voltage.
The present invention is directed to the output filter capacitor of DCM One Buck-Boost converter body, the output filter for the efficient stable designed
The on-Line Monitor Device and method of wave capacitor equivalent series resistance ESR and capacitor C, this method can not influence the normal work of circuit
The parameter ESR and C of capacitor are monitored in the case where work, provide foundation for the life prediction of capacitor and power supply, and be not necessarily to
Capacitance current detection part facilitates realization, has important practical application value.
Claims (5)
1. a kind of monitoring device of DCM buck-boost converter output capacitance, which is characterized in that including One Buck-Boost converter body master
Power circuit (1), driving circuit (3), display unit (8) and signal processing module；
The signal processing module includes power circuit control unit (2), switching frequency fsComputing unit (4), duty ratio DyIt calculates
Unit (5), output voltage trigger sampling unit (6), capacitor ESR and C computing unit (7)；
The One Buck-Boost converter body main power circuit (1) includes input voltage source Vin, switching tube Qb, sustained diodeb, filter
Wave inductance L, output filter capacitor and load RL, the output filter capacitor includes equivalent series resistance ESR and capacitor C, described
Switching tube QbDrain electrode and voltage source VinAnode connection, the one end filter inductance L respectively with switching tube QbSource electrode, two pole of afterflow
Pipe DbCathode connection, the filter inductance L other end and voltage source VinCathode connection, sustained diodebAnode respectively with etc.
Imitate one end, the load R of series resistance ESRLOne end connection, one end of the other end of equivalent series resistance ESR and capacitor C connect
It connects, the other end and load R of capacitor CLThe other end with voltage source VinCathode connection, load RLBoth ends are output voltage vo；
The input terminal of the power circuit control unit (2) voltage with One Buck-Boost converter body main power circuit (1) respectively
Source VinWith output voltage voConnection, the pwm signal of power circuit control unit (2) output end are respectively connected to switching frequency fsIt calculates
Unit (4) and duty ratio DyComputing unit (5), the output voltage v of One Buck-Boost converter body main power circuit (1)oWith power electricity
The pwm signal of road control unit (2) output end accesses output voltage triggering sampling unit (6), switching frequency fsComputing unit
(4), duty ratio DyThe output end that computing unit (5), output voltage trigger sampling unit (6) accesses capacitor ESR and C and calculates list
The output end of first (7), capacitor ESR and C computing unit (7) accesses display unit (8)；
The input terminal of the driving circuit (3) is connect with the pwm signal of power circuit control unit (2) output end, driving circuit
(3) output end accesses switching tube QbGate pole.
2. the monitoring device of DCM buck-boost converter output capacitance according to claim 1, which is characterized in that the letter
Number processing module is dsp chip TMS320F28335.
3. the monitoring device of DCM buck-boost converter output capacitance according to claim 1, which is characterized in that described aobvious
Show that unit (8) are 1602 liquid crystal displays.
4. a kind of monitoring method of DCM buck-boost converter output capacitance, which comprises the following steps:
Step 1, power circuit control unit (2), switching frequency f are created in signal processing modulesComputing unit (4), duty ratio
DyComputing unit (5), output voltage trigger sampling unit (6), capacitor ESR and C computing unit (7)；
Step 2, the power circuit control unit (2) of signal processing module acquires One Buck-Boost converter body main power circuit (1)
Output voltage voWith input voltage source Vin, obtain pwm signal and through driving circuit (3) driving switch pipe Qb；
Step 3, the pwm signal that power circuit control unit (2) export is respectively fed to switching frequency fsIt computing unit (4) and accounts for
Sky ratio DyComputing unit (5), through switching frequency fsComputing unit (4) processing obtains the current switching frequency f of converters, through duty
Compare DyComputing unit (5) processing obtains the current duty ratio D of convertery；
Step 4, the pwm signal and One Buck-Boost converter body main power circuit (1) of power circuit control unit (2) output is defeated
Voltage v outoIt is sent into output voltage triggering sampling unit (6) simultaneously, is exported through output voltage triggering sampling unit (6) processing
The instantaneous value v of voltageo(0)、vo(DyTs/ 2) and the average value V of output voltageo；TsFor converter switches period, DyFor converter
Duty ratio, voIt (0) is the corresponding instantaneous output voltage of pwm signal rising edge time, vo(DyTsIt/2) is pwm signal rising edge
The corresponding instantaneous output voltage of middle point moment between failing edge；
Step 5, the switching frequency f that will be obtaineds, duty ratio DyAnd the instantaneous value v of output voltageo(0)、vo(DyTs/ 2) and it is defeated
The average value V of voltage outoIt is sent into capacitor ESR and C computing unit (7) and carries out integrated treatment, obtain in One Buck-Boost converter body
The value of output filter capacitor current equivalent series resistance ESR and capacitor C；
Step 6, the value of resulting equivalent series resistance ESR and capacitor C is sent into display unit by capacitor ESR and C computing unit (7)
(8) real-time display.
5. the monitoring method of DCM buck-boost converter output capacitance according to claim 4, which is characterized in that in step 5
The formula of ESR and C computing unit (7) integrated treatment is as follows:
In formula, ESR is the resistance value of equivalent series resistance, and C is the capacitance of capacitor, and L is inductance value, fsFor converter switches frequency, Ts
For converter switches period, VoFor output voltage average value, DyFor the duty ratio of converter, vo(0) be pwm signal rising edge when
Carve corresponding instantaneous output voltage, vo(DyTs/ 2) the middle point moment between pwm signal rising edge and failing edge is corresponding instantaneous
Output voltage.
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| CN111007327A (en) * | 2018-10-08 | 2020-04-14 | 株洲中车时代电气股份有限公司 | Current transformer and capacitor state monitoring method and device thereof |
| CN111398692A (en) * | 2020-04-25 | 2020-07-10 | 南通大学 | Method for monitoring C value of output filter capacitor of Buck-type direct-current-direct-current converter |
| CN111796196A (en) * | 2020-07-01 | 2020-10-20 | 哈尔滨工业大学（深圳） | Buck converter fault detection method |
| CN112098880A (en) * | 2020-03-26 | 2020-12-18 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Linear power supply fault detection method |
| CN112710963A (en) * | 2020-12-28 | 2021-04-27 | 哈尔滨工业大学（深圳） | Switching power supply fault detection method based on pulse response |
| CN114035119A (en) * | 2021-10-14 | 2022-02-11 | 上海电力大学 | Three-level Buck-Boost converter direct current capacitor and power device open circuit fault detection method |
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