CN109752598A - A kind of on-line monitoring method of Switching Power Supply output capacitance, device and system - Google Patents
A kind of on-line monitoring method of Switching Power Supply output capacitance, device and system Download PDFInfo
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Abstract
The invention discloses a kind of on-line monitoring methods of Switching Power Supply output capacitance, device and system, the described method comprises the following steps: obtaining the sampled signal of the output voltage of Switching Power Supply；According to the sampled signal, voltage minimum and voltage max of the output voltage AC compounent of Switching Power Supply within any period are obtained；The voltage minimum and voltage max are substituted into output capacitance model, obtain the equivalent series resistance and equivalent capacity of output capacitance.Voltage minimum and voltage max of the present invention according to switch power source output voltage AC compounent within any period, the equivalent series resistance and equivalent capacity of output capacitance are calculated by output capacitance model, it only needs to sample switch power source output voltage, it is not necessary to modify circuit configurations for it, be conducive to monitor on-line, reduce monitoring cost.The present invention can be widely applied to Switching Power Supply monitoring technical field.
Description
Technical field
The present invention relates to Switching Power Supply monitoring technical field, especially a kind of on-line monitoring side of Switching Power Supply output capacitance
Method, device and system.
Background technique
Switching Power Supply in industrial and agricultural production, is handed over due to having many advantages, such as that output is steady, power density is big and fast response time
Logical transport, aerospace and national defence etc. application are very extensive, at the same time, propose higher want to Switching Power Supply reliability
It asks.Output capacitance is failure rate highest in Switching Power Supply, link the weakest.Usually to the monitoring of Switching Power Supply output capacitance
Method, is broadly divided into two classes: one kind is off-line type, by obtaining capacitance voltage and electric current, obtains equivalent series resistance and equivalent
Capacitor；Another kind of usual on-line monitoring method is insertion inductive current sensor in circuit to be online, passes through and obtains capacitor
Branch voltage and inductive branch electric current calculate output capacitance equivalent series resistance and equivalent capacity.But above two method,
Circuit configuration need to be modified, real time on-line monitoring is unfavorable for.Its monitoring device is complicated, increases monitoring cost.
Summary of the invention
In order to solve the above technical problems, it is an object of the invention to: a kind of switch electricity that can reduce monitoring cost is provided
The on-line monitoring method of source output capacitance, device and system.
The first technical solution adopted by the present invention is:
A kind of on-line monitoring method of Switching Power Supply output capacitance, comprising the following steps:
Obtain the sampled signal of the output voltage of Switching Power Supply；
According to the sampled signal, it is minimum to obtain voltage of the output voltage AC compounent of Switching Power Supply within any period
Value and voltage max；
The voltage minimum and voltage max are substituted into output capacitance model, obtain the equivalent series electricity of output capacitance
Resistance and equivalent capacity.
Further, the output capacitance model obtains by the following method:
Establish the expression formula of the inductive current of a switch periods；
The expression formula of the inductive current is subtracted into output current average, obtains the expression formula of capacitance current；
By the expression formula of the capacitance current multiplied by equivalent series resistance, the voltage expression on equivalent series resistance is obtained
Formula is obtained the voltage expression on capacitor by the expression formula of capacitance current；
By the voltage on equivalent series resistance and capacitor, output voltage average value is obtained, and solves the capacitance voltage at 0 moment
Expression formula；
By the sum of the voltage on equivalent series resistance and capacitor, the expression formula of output voltage instantaneous value is obtained；
The expression formula of output voltage instantaneous value subtracts output voltage direct current average value, obtains the expression of output voltage AC compounent
Formula；
By output voltage AC compounent expression formula, when obtaining 0 moment and switch pipe and switching to close short by being connected
The output voltage AC compounent value at quarter, to obtain the linear equation in two unknowns group about equivalent series electricity class value and equivalent capacity；
It solves the linear equation in two unknowns group, obtains the expression formula and output capacitance of the equivalent series resistance of output capacitance
The expression formula of equivalent capacity.
Second of technical solution adopted by the present invention is:
A kind of on-Line Monitor Device of Switching Power Supply output capacitance, comprising:
Memory, for storing program；
Processor executes a kind of on-line monitoring side of Switching Power Supply output capacitance for loading described program
Method.
The third technical solution adopted by the present invention is:
A kind of on-line monitoring system of Switching Power Supply output capacitance, comprising:
Observation circuit is sampled for the output voltage to Switching Power Supply, exports sampled signal；
Processing module, for executing a kind of on-line monitoring method of Switching Power Supply output capacitance.
Further, the observation circuit includes:
Isolation circuit carries out isolation sampling for the output voltage signal to Switching Power Supply, exports sampled voltage；
Amplifying circuit, the sampled voltage for exporting isolation circuit amplify, and obtain amplified signal；
Analog to digital conversion circuit for the amplified signal to be converted from analog into digital signal, and is exported to processing
Module.
Further, the isolation circuit is transformer and the Mutual Inductance Coupling series resonant circuit that first capacitor forms.
Further, the amplifying circuit includes two-stage calculation amplifier.
Further, further includes:
Display module, for showing the equivalent series resistance and equivalent capacity of the output capacitance.
Further, further includes:
Communication module is set for the equivalent series resistance of the output capacitance and equivalent capacity to be sent to specified reception
It is standby.
The beneficial effects of the present invention are: electricity of the present invention according to switch power source output voltage AC compounent within any period
Minimum value and voltage max are pressed, the equivalent series resistance and equivalent capacity of output capacitance are calculated by output capacitance model,
It only needs to sample switch power source output voltage, it is not necessary to modify circuit configuration, is conducive to monitor on-line, reduces prison
Survey cost.
Detailed description of the invention
Fig. 1 is the schematic diagram of traditional Off-line SMPS output capacitance monitoring method；
Fig. 2 is the equivalent circuit diagram of Buck Switching Power Supply；
Fig. 3 works in inductive current, capacitance current, equivalent series resistance and the equivalent electricity when DCM mode for circuit in Fig. 2
Voltage and output voltage waveforms in appearance；
Fig. 4 is the flow chart of the modeling method of the output capacitance model in a kind of specific embodiment of the present invention；
Fig. 5 is the module frame of the on-line monitoring system of the Switching Power Supply output capacitance in a kind of specific embodiment of the present invention
Figure；
Fig. 6 is the module frame chart of the observation circuit in a kind of specific embodiment of the present invention；
Fig. 7 is the schematic diagram of the observation circuit in a kind of specific embodiment of the present invention；
Fig. 8 is the flow chart of the on-line monitoring method of the Switching Power Supply output capacitance in a kind of specific embodiment of the present invention.
Specific embodiment
The present invention is further detailed with specific embodiment with reference to the accompanying drawings of the specification.
Fig. 1 shows traditional Off-line SMPS output capacitance monitoring method, by electrolytic capacitor and simple alternating current
Power supply series connection, obtains capacitance voltage and electric current, by filtering, discrete Fourier transform (i.e. FFT), respectively obtain capacitance voltage and
The amplitude of electric current, then calculates equivalent series resistance.Traditional online Switching Power Supply output capacitance monitoring method is, in circuit
Middle insertion inductive current sensor, by the inductive current and capacitance voltage of acquisition, using least square method (LMS) scheduling algorithm,
Analyze the variation of equivalent series resistance and equivalent capacity.Both methods is required to the circuit structure of modification power module, unfavorable
In without invasion ground real time on-line monitoring.
Fig. 2 shows the equivalent circuit diagrams of Buck Switching Power Supply, wherein output capacitance uses series equivalent model, uses
Equivalent series resistance RESRIt connects with equivalent capacity C and states output capacitance.In Buck power switch signal UgControl under, switch
Pipe S is on and ends two states, and circuit has different topological structures under both states, to form two kinds of electricity
Road is flowed back to, therefore output voltage generates ripple, the i.e. AC compounent of output voltage, the equivalent series electricity of the ripple and output capacitance
Hinder RESRIt is related with equivalent capacity C.Using output voltage AC compounent value, establish DCM Buck Switching Power Supply output capacitance etc.
Imitate series resistance RESRWith equivalent capacity C model, may be implemented without intrusively real time on-line monitoring output capacitance.
Fig. 3 gives circuit work and inductive current i when DCM modeL, capacitance current ic, equivalent series resistance RESROn
Voltage VESRWith the voltage V on equivalent capacity CcAnd output voltage VoWaveform.
Present embodiment discloses a kind of modeling methods of the output capacitance model of DCM Buck Switching Power Supply, as shown in Figure 4.
Itself specifically includes the following steps:
Step S401, the expression formula of the inductive current of a switch periods is established.
From Fig. 2 circuit, analysis can obtain inductive current in the expression formula of a switch periods are as follows:
In formula: UinFor input voltage；UoFor output voltage average value；L is inductance value；TSFor switch periods；D1For switching tube
Duty ratio；0~D1TSThe conducting of moment switching tube, freewheeling diode shutdown；D1TS~(D1+D2)TSThe shutdown of moment switching tube, afterflow
Diode current flow；(D1+D2)TS~TSMoment inductive current is 0, into on-off state.
S402, the expression formula of the inductive current is subtracted into output current average, obtains the expression formula of capacitance current.
Export current average are as follows:
Capacitance current is that inductive current subtracts output current average, expression formula are as follows:
S403, by the expression formula of the capacitance current multiplied by equivalent series resistance, obtain the voltage on equivalent series resistance
Expression formula is obtained the voltage expression on capacitor by the expression formula of capacitance current.
Equivalent series resistance RESROn voltage uESR(t) expression formula is
Voltage u on equivalent capacity Cc(t) with electric current ic(t) relationship are as follows:
In formula: D=D1+D2；UC(0)、UC(D1TS) and UC(DTS) it is respectively zero moment, D1TSWith DTSMoment equivalent capacity C
On voltage.Wherein:
S404, by the voltage on equivalent series resistance and capacitor, obtain output voltage average value, and solve the electricity at 0 moment
Hold the expression formula of voltage.
Output voltage average value UoAre as follows:
Obviously, above formula Section 2 is 0, so
It is obtained by above formula:
S450, by the sum of voltage on equivalent series resistance and capacitor, obtain the expression formula of output voltage instantaneous value.
Output voltage instantaneous value uOIt (t) is uc(t) and uESRThe sum of (t), so
S406, output voltage instantaneous value expression formula subtract output voltage direct current average value, obtain output voltage exchange point
Expression formula is measured, this formula is piecewise function.
S407, by output voltage AC compounent expression formula, obtain 0 moment and switch pipe by be connected switch to close it is short
At the time of output voltage AC compounent value, to obtain the linear equation in two unknowns about equivalent series electricity class value and equivalent capacity
Group.
0 moment and D1TSThe AC compounent at moment, output voltage is respectively as follows:
S408, R is solvedESRCalculation formula with C is
For DCM Buck Switching Power Supply, it is apparent from Uin、UoAnd TS, and because
In any cycle T of output voltage AC compounentSIt is interior,For the minimum of the voltage alternating component in the period
Value,For the maximum value of the voltage alternating component in the period, it may be assumed that
Therefore, the DCM Buck output capacitance monitoring model that the present embodiment proposes need to only measure duty cycle of switching D1, it is any
Output voltage AC compounent minimum value in periodAnd maximum valueR can be calculated to obtainESRAnd C.
Preferably, in order to improve computational accuracy, the output voltage AC compounent minimum value in multiple periods can be measured And maximum valueCalculate its average value:
Wherein, what i was indicated is a cycle in the 1st to n period.It is substituted with mean valueWithIt calculates
Method is as follows:
Above-mentioned DCM Buck Switching Power Supply output capacitance monitoring model, it is only necessary to output voltage AC compounent is handled,
Equivalent series resistance R can be obtainedESRWith equivalent capacity C, it is not necessarily to trigger circuit, reduces monitoring cost.
Buck artificial circuit is built in MATLAB, is changed load resistance value, is made its work in DCM mode.Buck circuit is defeated
Entering voltage is 30V, output voltage 10V, inductance 1mH, and capacitor is set as 220uF, 168m Ω, and table 1 is to supervise according to the present invention
The emulation data obtained with modeling method are surveyed, emulate the data verification correctness of the model, it was demonstrated that side proposed by the present invention
Method is a kind of reliable DCM Buck Switching Power Supply output capacitance on-line monitoring and modeling method.
Table 1
Referring to Fig. 5, a kind of on-line monitoring system of Switching Power Supply output capacitance is present embodiments provided comprising monitoring electricity
Road and processing module.
Wherein, the input terminal of observation circuit connects the output end of DCM Buck switch power module output capacitance to be measured, prison
The input terminal of the output end connection processing module of slowdown monitoring circuit.
The output end of DCM Buck switch power module output capacitance to be measured is connected by the input terminal of observation circuit, is exported
The input terminal of end connection processing module, after observation circuit receives output voltage signal, to the signal isolation, filtering, amplification
And analog-to-digital conversion, the digital signal of amplified output voltage AC compounent is generated, processing module is sent into, is pressed in processing module
According to the model that the present invention establishes, the equivalent series resistance R of output capacitance is calculatedESRWith equivalent capacity C.One kind as shown in Figure 5
The specific work process of the on-line monitoring system of Switching Power Supply output capacitance are as follows:
1, after DCM Buck switch power module is working properly, output voltage DC component is maintained at stable state.
2, power module output voltage signal is passed to observation circuit, and observation circuit is completed Isolation, amplification and modulus and turned
It changes, generates digital signal.
3, observation circuit generate digital signal be passed to processing module stored, find out any period minimum M and
Maximum value N, corresponding output voltage ripple signalAnd maximum valueWherein A is monitoring electricity
The amplification factor on road.
4, processing module utilizesWithAccording to model proposed by the present invention, calculate output capacitance etc.
Imitate series resistance RESRWith equivalent capacity C.
The observation circuit of the present embodiment is as shown in Figure 6.Observation circuit includes isolation circuit, amplifying circuit and analog-to-digital conversion electricity
Road.
The output end of the input terminal connection filter capacitor of isolation circuit, output end connect amplifying circuit.
Specifically, connecting the output end of filter capacitor by the input terminal of isolation circuit, output end connects amplifying circuit, from
And realize the isolation of Switching Power Supply and amplifying circuit, analog to digital conversion circuit, the noise of input signal is reduced, while filtering out switch electricity
DC component in the output voltage signal of source.
The output end of the input terminal connection isolation circuit of amplifying circuit, output end connect analog to digital conversion circuit.
Specifically, connecting the output end of isolation circuit by the input terminal of amplifying circuit, output end connects analog-to-digital conversion electricity
The amplification of ripple is realized on road, improves measurement accuracy.Amplifying circuit need to have low input offset voltage, low input bias current,
The performances such as low input offset current, low noise and high gain-bandwidth product.Amplifying circuit is to meet above-mentioned requirements, generally uses two-stage
Enlarged structure, first order amplifier have low input offset voltage, low input bias current, low input offset current and low noise
Performance；Second level amplifier is with high gain-bandwidth product.
The output end of the input termination amplifying circuit of analog to digital conversion circuit, output termination processing module.
Specifically, the output end of the input termination amplifying circuit by analog to digital conversion circuit, output termination processing module will
Amplified ripple is converted into digital signal, and module for processing is handled.Analog-to-digital conversion module, can be using 8bit's
ADC chip.Optimization, the ADC chip of 12bit or 16bit can be used, to obtain higher measurement accuracy.
In a specific embodiment, as shown in fig. 7, being the concrete structure schematic diagram of observation circuit of the present invention, including
Isolation circuit, two-stage amplifying circuit and analog to digital conversion circuit.Wherein isolation circuit is made of transformer and capacitor, and input connects power supply
On the one hand output capacitance output end passes through the transformer isolation less noise of input signal, another aspect transformer and capacitor
Mutual Inductance Coupling series resonant tank is constituted, DC component is filtered out, only retaining, there is the ripple signal of switching frequency to enter amplification electricity
Road.In amplifying circuit, the first operational amplifier op1 has low input offset voltage, low input bias current, low input imbalance electricity
Stream and low-noise performance, to avoid direct current biasing and noise jamming, second operational amplifier op2 is introduced in ripple signal to be measured
With high gain-bandwidth product, to keep high-gain under switching frequency.Amplified signal is converted into number through ADC module sampling
After signal, it is sent into subsequent processing module.
Referring to Fig. 8, processing module executes following steps:
S801, obtain Switching Power Supply output voltage sampled signal；The digital signal that observation circuit is sent is received, it should
Signal is that observation circuit obtains electric power output voltage isolation, amplification and analog-to-digital conversion.
S802, according to the sampled signal, obtain electricity of the output voltage AC compounent of Switching Power Supply within any period
Press minimum value and voltage max；From received digital signal, the voltage minimum and maximum value in any one period are retrieved.
Preferably, the minimum value and maximum value in available multiple periods, then acquires average value.
S803, the voltage minimum and voltage max are substituted into output capacitance model, obtains the equivalent of output capacitance
Series resistance and equivalent capacity.
Voltage minimum and maximum value are handled, the minimum M and maximum value N in any period, corresponding output voltage
Ripple signalAnd maximum valueWherein A is the amplification factor of observation circuit.To multiple
Data amount check between the minimum value and maximum value data in period is counted, respectively N1,N2,…,Nn, then
Wherein, f is ADC sample frequency, TSFor the switch period, i is a cycle in 1 to n period, D1
For duty cycle of switching.
It willD1And D2Substitute into the model that the present invention establishes:
As preferred embodiment, average value can be usedWithInstead of above formulaWithJust
To the equivalent capacity C and equivalent series resistance R of DCM Buck Switching Power Supply output capacitanceESR。
It further include display module and/or communication module as preferred embodiment.
Display module, for showing the equivalent series resistance and equivalent capacity of the output capacitance.The display module is
Display screen etc. is used for real-time display monitoring result.
Communication module is set for the equivalent series resistance of the output capacitance and equivalent capacity to be sent to specified reception
It is standby.For monitoring result to be sent to external reception equipment, such as server etc..
In conclusion the present invention is by analyzing each node voltage of circuit from DCM Buck switch power supply line structure
Current expression, to establish the equivalent capacity C and equivalent series resistance R of output capacitanceESR, which only needs input switch electric
Voltage minimum and maximum value in source output voltage AC compounent any period, model are easy to be reliable.It is defeated by isolation circuit
Enter the output end of end connection filter capacitor, isolated DC component and switching power supply noise, to obtain the output of low noise acoustic jamming
Voltage ripple；By using the output end of the input amplifier connection isolation circuit of two-stage enlarged structure, reduce amplification electricity
Itself biasing and the influence of noise to measured signal on road, improve measurement accuracy, to obtain the output voltage of plus and blowup
Ripple；The output end of amplifying circuit is connected by the input terminal of analog to digital conversion circuit, output end connects processing module, to obtain
The digital signal of the output voltage ripple of amplification obtains the equivalent capacity C of output capacitance using model in processing module and waits
Imitate series resistance RESR, significantly simplified the on-Line Monitor Device of DCM Buck Switching Power Supply output capacitance, save monitoring at
This.
For the step number in above method embodiment, it is arranged only for the purposes of illustrating explanation, between step
Sequence do not do any restriction, the execution of each step in embodiment sequence can according to the understanding of those skilled in the art come into
Row is adaptively adjusted.
It is to be illustrated to preferable implementation of the invention, but the present invention is not limited to the embodiment above, it is ripe
Various equivalent deformation or replacement can also be made on the premise of without prejudice to spirit of the invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all included in the scope defined by the claims of the present application a bit.
Claims (9)
1. a kind of on-line monitoring method of Switching Power Supply output capacitance, it is characterised in that: the following steps are included:
Obtain the sampled signal of the output voltage of Switching Power Supply；
According to the sampled signal, obtain voltage minimum of the output voltage AC compounent of Switching Power Supply within any period and
Voltage max；
The voltage minimum and voltage max are substituted into output capacitance model, obtain output capacitance equivalent series resistance and
Equivalent capacity.
2. a kind of on-line monitoring method of Switching Power Supply output capacitance according to claim 1, it is characterised in that: described defeated
Capacitor model obtains by the following method out:
Establish the expression formula of the inductive current of a switch periods；
The expression formula of the inductive current is subtracted into output current average, obtains the expression formula of capacitance current；
By the expression formula of the capacitance current multiplied by equivalent series resistance, the voltage expression on equivalent series resistance is obtained, by
The expression formula of capacitance current obtains the voltage expression on capacitor；
By the voltage on equivalent series resistance and capacitor, output voltage average value is obtained, and solves the table of the capacitance voltage at 0 moment
Up to formula；
By the sum of the voltage on equivalent series resistance and capacitor, the expression formula of output voltage instantaneous value is obtained；
The expression formula of output voltage instantaneous value subtracts output voltage direct current average value, obtains output voltage AC compounent expression formula；
By output voltage AC compounent expression formula, obtained for 0 moment and at the time of switch pipe switchs to close short by being connected
Output voltage AC compounent value, to obtain the linear equation in two unknowns group about equivalent series electricity class value and equivalent capacity；
Solve the linear equation in two unknowns group, obtain the equivalent series resistance of output capacitance expression formula and output capacitance it is equivalent
The expression formula of capacitor.
3. a kind of on-Line Monitor Device of Switching Power Supply output capacitance, it is characterised in that: include:
Memory, for storing program；
Processor executes method according to claim 1 or 2 for loading described program.
4. a kind of on-line monitoring system of Switching Power Supply output capacitance, it is characterised in that: include:
Observation circuit is sampled for the output voltage to Switching Power Supply, exports sampled signal；
Processing module, it is method according to claim 1 or 2 for executing.
5. a kind of on-line monitoring system of Switching Power Supply output capacitance according to claim 4, it is characterised in that: the prison
Slowdown monitoring circuit includes:
Isolation circuit carries out isolation sampling for the output voltage signal to Switching Power Supply, exports sampled voltage；
Amplifying circuit, the sampled voltage for exporting isolation circuit amplify, and obtain amplified signal；
Analog to digital conversion circuit for the amplified signal to be converted from analog into digital signal, and is exported to processing module.
6. a kind of on-line monitoring system of Switching Power Supply output capacitance according to claim 5, it is characterised in that: it is described every
It is transformer and the Mutual Inductance Coupling series resonant circuit that first capacitor forms from circuit.
7. a kind of on-line monitoring system of Switching Power Supply output capacitance according to claim 5, it is characterised in that: described to put
Big circuit includes two-stage calculation amplifier.
8. a kind of on-line monitoring system of Switching Power Supply output capacitance according to claim 4, it is characterised in that: also wrap
It includes: display module, for showing the equivalent series resistance and equivalent capacity of the output capacitance.
9. a kind of on-line monitoring system of Switching Power Supply output capacitance according to claim 4, it is characterised in that: also wrap
It includes: communication module, for the equivalent series resistance of the output capacitance and equivalent capacity to be sent to specified receiving device.
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| CN111781531B (en) * | 2020-07-01 | 2022-11-29 | 哈尔滨工业大学（深圳） | Switching power supply fault detection method |
| CN112731023A (en) * | 2020-12-22 | 2021-04-30 | 山特电子（深圳）有限公司 | Capacitance fault protection circuit and protection method for alternating current circuit |
| CN113156219A (en) * | 2021-05-10 | 2021-07-23 | 郑州大学 | Method and device for monitoring capacitance value and degradation state of output capacitor of Boost PFC converter |
| CN113156219B (en) * | 2021-05-10 | 2024-03-29 | 郑州大学 | Method and device for monitoring capacitance value and degradation state of output capacitor of Boost PFC converter |
| CN113960359A (en) * | 2021-12-22 | 2022-01-21 | 江苏由甲申田新能源科技有限公司 | Current sampling circuit, method, system, device and storage medium |
| CN113960359B (en) * | 2021-12-22 | 2022-03-11 | 江苏由甲申田新能源科技有限公司 | Current sampling circuit, method, system, device and storage medium |
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Application publication date: 20190514 |