CN108241129A - Switching power supply output filter capacitor monitoring device and method - Google Patents
Switching power supply output filter capacitor monitoring device and method Download PDFInfo
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- CN108241129A CN108241129A CN201810018732.1A CN201810018732A CN108241129A CN 108241129 A CN108241129 A CN 108241129A CN 201810018732 A CN201810018732 A CN 201810018732A CN 108241129 A CN108241129 A CN 108241129A
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- 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
- G01R31/42—AC power supplies
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- 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
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- 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
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Abstract
Switching Power Supply output filter capacitor device and method of the present invention, wherein, Switching Power Supply output filter capacitor device, it may include trigger circuit, tension measuring circuit and processing module；The control signal end of the input terminal connection measured switch power module of trigger circuit, output terminal connect the signal input part of tension measuring circuit；The output terminal of the filter capacitor for measuring input terminal connection measured switch power module of tension measuring circuit, measures output terminal connection processing module.So as to when trigger circuit receives the first hopping edge signal and the second hopping edge signal, generate the first trigger signal and the second trigger signal；Tension measuring circuit can carry out sampled measurements to the output voltage of filter capacitor respectively, obtain the first output voltage signal and the second output voltage signal when receiving the first trigger signal and the second trigger signal；And pass through the processing of processing module, it can obtain the capacity and ESR of filter capacitor.And then observation circuit is significantly simplified, reduce monitoring cost.
Description
Technical field
The present invention relates to Switching Power Supply monitoring technical fields, are monitored more particularly to a kind of Switching Power Supply output filter capacitor
Device and method.
Background technology
With the development of switch power technology, obtained in the scenes such as household electrical appliance, instrument and meter, consumer electronics extensively
Application.Since power module is the basis of entire circuit work, reliability is directly related to the normal work of entire circuit.
For switch power module, the filter capacitor of filtering is the highest part of probability of breaking down in entire module.It is more than
The failure of 60% switch power module is all due to caused by the failure of filter capacitor.Filter capacitor is by prolonged old
Change, wherein electrolyte can be reduced, and the capacitance so as to cause filter capacitor reduces and equivalent series resistance (Equivalent
Series Resistance, ESR) increase.Usual Switching Power Supply output filter capacitor monitoring passes through an electricity of connecting on inductance
Flow sensor in an output terminal voltage sensor in parallel, measures the electric current and output voltage for flowing through inductance, but increase two
Sensor, so as to increase the cost of implementation of hardware circuit.Simultaneously as current sensor needs are connected in circuit, it can change
Become the structure of circuit, cause monitoring use not convenient enough.
At present, the monitoring of traditional Switching Power Supply output filter capacitor can be carried out by the output voltage signal in specific node
Sampling, by output filter capacitor capacity and ESR is calculated.But during realization, inventor is had found in traditional technology extremely
It is few that there are the following problems：The observation circuit of traditional Switching Power Supply output filter capacitor monitoring is complicated, increases monitoring cost.
Invention content
Based on this, it is necessary to which the observation circuit monitored for traditional technical solution to Switching Power Supply output filter capacitor is answered
The problem of miscellaneous, provides a kind of Switching Power Supply output filter capacitor device and method.
To achieve these goals, on the one hand, an embodiment of the present invention provides a kind of Switching Power Supply output filter capacitor dresses
It puts, including trigger circuit, tension measuring circuit and processing module；The input terminal connection measured switch power module of trigger circuit
Control signal end, output terminal connect the signal input part of tension measuring circuit；The measurement input terminal connection of tension measuring circuit is treated
The output terminal of the filter capacitor of slowdown monitoring switch power module measures output terminal connection processing module；
Trigger circuit by the first hopping edge signal inputted according to measured switch power module, generation the first trigger signal
It is transferred to tension measuring circuit；Tension measuring circuit when receiving the first trigger signal, to the output voltage of filter capacitor into
The first obtained output voltage signal is transferred to processing module by row sampled measurements；
Trigger circuit by according to measured switch power module the second hopping edge signal, generation the second trigger signal transmit
To tension measuring circuit；Tension measuring circuit adopts the output voltage of filter capacitor when receiving the second trigger signal
Sample measures, and the second obtained output voltage signal is transferred to processing module；
Processing module handles the first output voltage signal and the second output voltage signal, obtain filter capacitor capacity and
ESR。
The first hopping edge signal is rising edge signal in one of the embodiments,；Second hopping edge signal is failing edge
Signal.
Trigger circuit includes trigger, exclusive or device and delayer in one of the embodiments,；
The signal output end of the first input end connection exclusive or device of trigger, the first output terminal connect one end of delayer,
Second output terminal connects the second input terminal of trigger；The first signal input part connection measured switch power module of exclusive or device
Control signal end, second signal input terminal connect the other end of delayer；The signal output end connection voltage measurement electricity of exclusive or device
The signal input part on road.
Trigger is d type flip flop, JK flip-flop or rest-set flip-flop in one of the embodiments,.
Tension measuring circuit includes acquisition module in one of the embodiments,；
The signal output end of the control terminal connection trigger circuit of acquisition module, input terminal connect the output terminal of filter capacitor,
Output terminal connection processing module.
Tension measuring circuit further includes amplifier in one of the embodiments,；
The output terminal of the input terminal connection filter capacitor of amplifier, output terminal connect the input terminal of acquisition module.
Amplifier is Isolation Amplifier Module or non-isolated amplification module in one of the embodiments,.
Isolation Amplifier Module amplifies mould for transformer isolation amplification module or light-coupled isolation in one of the embodiments,
Block.
On the other hand, the embodiment of the present invention additionally provides a kind of Switching Power Supply output filter capacitor monitoring method, including with
Lower step：
The first output voltage signal and the second output voltage signal of receiving voltage measuring circuit transmission；First output voltage
Signal is receiving what trigger circuit was generated according to the first hopping edge signal of measured switch power module for tension measuring circuit
During the first trigger signal, it is obtained that sampled measurements are carried out to the output voltage of filter capacitor；Second output voltage signal is electricity
Pressure measuring circuit is receiving second triggering of the trigger circuit according to the second hopping edge signal generation of measured switch power module
During signal, it is obtained that sampled measurements are carried out to the output voltage of filter capacitor；
The first output voltage signal and the second output voltage signal are handled, obtains the capacity and ESR of filter capacitor.
The first hopping edge signal is rising edge signal in one of the embodiments,；Second hopping edge signal is failing edge
Signal.
A technical solution in above-mentioned technical proposal has the following advantages that and advantageous effect：
The control signal end of measured switch power module is connected by the input terminal of trigger circuit, output terminal connection voltage is surveyed
The signal input part of circuit is measured, so as to receive the first hopping edge signal and second of measured switch power module in trigger circuit
During the signal of hopping edge, the first trigger signal generated respectively and the second trigger signal can be transferred to tension measuring circuit；Pass through
The output terminal of the filter capacitor for measuring input terminal connection measured switch power module of tension measuring circuit, so as to voltage measurement electricity
When road can receive the first trigger signal and the second trigger signal, sampled measurements are carried out to the output voltage of filter capacitor respectively,
The first obtained output voltage signal and the second output voltage signal are transferred to processing module；Pass through the survey of tension measuring circuit
Output terminal connection processing module is measured, so as to by handling the first output voltage signal and the second output voltage signal, be filtered
The capacity and ESR of wave capacitance, and then significantly simplify what the output filter capacitor of measured switch power module was monitored
Observation circuit reduces monitoring cost.
Description of the drawings
By being more particularly described for attached the preferred embodiment of the present invention shown in figure, above and other mesh of the invention
, feature and advantage will become more fully apparent.Identical reference numeral indicates identical part in whole attached drawings, and does not carve
Meaning draws attached drawing by actual size equal proportion scaling, it is preferred that emphasis is shows the purport of the present invention.
The ESR process flow schematic diagrames of filter capacitor in Switching Power Supply traditional Fig. 1；
Fig. 2 is the structure diagram of Switching Power Supply output filter capacitor monitoring device embodiment 1 of the present invention；
Fig. 3 is the concrete structure schematic diagram of Switching Power Supply output filter capacitor monitoring device embodiment of the present invention；
Fig. 4 is the trigger circuit structure schematic diagram of Switching Power Supply output filter capacitor monitoring device embodiment of the present invention；
Fig. 5 is that the trigger circuit concrete structure of Switching Power Supply output filter capacitor monitoring device embodiment of the present invention is illustrated
Figure；
Fig. 6 is the tension measuring circuit structural representation of Switching Power Supply output filter capacitor monitoring device embodiment of the present invention
Figure；
Fig. 7 is that the tension measuring circuit concrete structure of Switching Power Supply output filter capacitor monitoring device embodiment of the present invention shows
It is intended to；
Fig. 8 is the flow diagram of Switching Power Supply output filter capacitor monitoring method embodiment 1 of the present invention.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In attached drawing
Give the preferred embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is made to the disclosure more thorough and comprehensive.
It should be noted that when an element is considered as " connection " another element, it can be directly to separately
One element simultaneously in combination is integrated or may be simultaneously present centering elements.Term as used herein " installation ", " one
End ", " other end " and similar statement are for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The normally understood meaning of technical staff is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " including one or more phases
The arbitrary and all combination of the Listed Items of pass.
Switching Power Supply output filter capacitor monitoring device and embodiment of the method a wherein application scenarios of the present invention：
The ESR process flow schematic diagrames of filter capacitor in Switching Power Supply traditional Fig. 1, as shown in Figure 1, traditional to be measured
The ESR monitorings of filter capacitor are typically by connecting one on the inductance in measured switch power module in switch power module
Current sensor in the output terminal of a measured switch power module voltage sensor in parallel, measures the inductance electricity for flowing through inductance
The output voltage of stream and measured switch power module outlet, since the ratio of output ripple voltage and inductance ripple current is
The assessed value of ESR, therefore using empirical mode decomposition (EMD) and Hilbert transform (HHT) by inductive current and output ripple
Calculate ESR.
By taking Buck types circuit is measured switch power module as an example, at traditional ESR to filter capacitor in Switching Power Supply
Managing flow is：Can Saber emulation first be carried out to Buck types circuit, such as artificial circuit design, parameter setting and feature signal extraction；
Then filter capacitor information of voltage is measured by current sensor measurement inductor current signal, voltage sensor.By to electric current
Signal and voltage signal carry out empirical mode decomposition, obtain IMFs (intrinsic mode functions)；It converts to obtain by carrying out HHT to IMFs
H (ω, t) (HHT transforming function transformation functions) obtains α (t) (transient state amplitude), and then obtain ESR by H (ω, t).Traditional opens to be measured
The filter capacitor monitoring needs of powered-down source module measure two signals of inductive current and filter capacitor output ripple, thus need to be to electricity
Road increases by two sensors, increases the realization cost of hardware circuit, and then increase the complexity of hardware circuit.Meanwhile by
In current sensor needs connect circuit, the structure of circuit can be changed, be unfavorable for applying.
And the embodiment of the present invention can receive the first hopping edge signal and the of measured switch power module by trigger circuit
Two hopping edge signals, so as to generate the first trigger signal and the second trigger signal；It can received by tension measuring circuit
When the first trigger signal and the second trigger signal, sampled measurements are carried out to the output voltage of filter capacitor respectively, it is defeated to obtain first
Go out voltage signal and the second output voltage signal；Can the first output voltage signal and the second output voltage be handled by processing module
Signal obtains the capacity and ESR of filter capacitor, and then significantly simplifies the output filter capacitor to measured switch power module
The observation circuit being monitored, reduces monitoring cost.
In order to solve the problems, such as that the observation circuit that traditional technical solution monitors Switching Power Supply output filter capacitor is complicated,
The present invention provides a kind of Switching Power Supply output filter capacitor device embodiments 1.Fig. 2 exports filtered electrical for Switching Power Supply of the present invention
The structure diagram of capacitance device embodiment 1, as shown in Figure 2, it may include trigger circuit 210, tension measuring circuit 220 and processing mould
Block 230；The control signal end of the input terminal connection measured switch power module of trigger circuit 210, output terminal connection voltage measurement
The signal input part of circuit 220；The filter capacitor for measuring input terminal connection measured switch power module of tension measuring circuit 220
Output terminal, measure output terminal connection processing module 230.
Trigger circuit 210 by the first hopping edge signal inputted according to measured switch power module, generation first triggering
Signal transmission is to tension measuring circuit 220；Tension measuring circuit 220 is when receiving the first trigger signal, to filter capacitor
Output voltage carries out sampled measurements, and the first obtained output voltage signal is transferred to processing module 230；Trigger circuit 210 will
Tension measuring circuit 220 is transferred to according to the second trigger signal of the second hopping edge signal of measured switch power module, generation；
Tension measuring circuit 220 carries out sampled measurements when receiving the second trigger signal, to the output voltage of filter capacitor, will obtain
The second output voltage signal be transferred to processing module 230；Processing module 230 handles the first output voltage signal and the second output
Voltage signal obtains the capacity and ESR of filter capacitor.
Wherein, trigger circuit 210 can refer to the circuit with stable state, such as when applying an appropriate pulse to trigger circuit,
Required transformation output can be started；Trigger circuit 210 can also refer to the circuit of unstable state.Measured switch power module may include
Control signal end, control signal end can be the control signal ends of the switching tube of measured switch power module, such as measured switch
The switching tube of power module for MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-
Oxide semiconductor field effect) pipe, then control signal end is the gate terminal of metal-oxide-semiconductor.Measured switch power module may include filtering
Capacitance, the output terminal of filter capacitor can connect load.
Inputting the control signal of the control signal end of measured switch power module may include the first hopping edge signal and second
Hopping edge signal, such as the control signal of input control signal for PWM (Pulse Width Modulation, pulsewidth modulation)
When, the first hopping edge signal can be pwm control signal from high level switch to low level when hopping edge signal or
Pwm control signal from low level switch to high level when hopping edge signal；Second hopping edge signal can be pwm control signal from
Hopping edge signal or pwm control signal when high level switchs to low level from low level switch to high level when saltus step
Along signal.
Preferably, the hopping edge signal when the first hopping edge signal switchs to low level for pwm control signal from high level
When, the second hopping edge signal for pwm control signal from low level switch to high level when hopping edge signal；Believe in the first hopping edge
Number for pwm control signal from low level switch to high level when hopping edge signal when, the second hopping edge signal be pwm control signal
Hopping edge signal when switching to low level from high level.
Specifically, the input terminal by trigger circuit 210 connects the control signal end of measured switch power module, output terminal
The signal input part of tension measuring circuit 220 is connected, so as to receive the first of measured switch power module in trigger circuit 210
When hopping edge signal and the second hopping edge signal, the first trigger signal generated respectively and the second trigger signal can be transferred to electricity
Press measuring circuit 220；The filter capacitor of measured switch power module is connected by the measurement input terminal of tension measuring circuit 220
Output terminal, when can receive the first trigger signal and the second trigger signal so as to tension measuring circuit 220, respectively to filter capacitor
Output voltage carry out sampled measurements, the first obtained output voltage signal and the second output voltage signal are transferred to processing mould
Block 230；By the measurement output terminal connection processing module 230 of tension measuring circuit 220, so as to pass through processing the first output electricity
Signal and the second output voltage signal are pressed, obtains the capacity and ESR of filter capacitor, and then is significantly simplified to measured switch electricity
The observation circuit that the output filter capacitor of source module is monitored.
Above-mentioned Switching Power Supply output filter capacitor monitoring device embodiment connects to be measured open by the input terminal of trigger circuit
The control signal end of powered-down source module, output terminal connect the signal input part of tension measuring circuit；The measurement of tension measuring circuit
The output terminal of the filter capacitor of input terminal connection measured switch power module, measures output terminal connection processing module.So as to touch
When Power Generation Road receives the first hopping edge signal and the second hopping edge signal of measured switch power module, generation the first triggering letter
Number and the second trigger signal；Tension measuring circuit can be when receiving the first trigger signal and the second trigger signal, respectively to filter
The output voltage of wave capacitance carries out sampled measurements, obtains the first output voltage signal and the second output voltage signal；Place can be passed through
The first output voltage signal of resume module and the second output voltage signal are managed, obtains the capacity and ESR of filter capacitor.And then substantially
Degree simplifies the observation circuit being monitored to the output filter capacitor of measured switch power module, reduces monitoring cost.
In a specific embodiment, the first hopping edge signal is rising edge signal；Second hopping edge signal is declines
Along signal.
Specifically, rising edge signal refers to signal of the control signal in rising edge time of control signal end.Failing edge
Signal refers to signal of the control signal at the failing edge moment of control signal end.It is rising edge signal in the first hopping edge signal
When, the first trigger signal is generated by trigger circuit and is transferred to voltage measurement signal, first is obtained by tension measuring circuit
Output voltage signal.When the second hopping edge signal is failing edge signal, the second trigger signal is generated by trigger circuit and is passed
Voltage measurement signal is defeated by, the second output voltage signal is obtained by tension measuring circuit.It is defeated by processing module processing first
Go out voltage signal and the second output voltage signal, obtain the capacity and ESR of filter capacitor, need to only obtain the rising edge of control signal
Signal and failing edge signal, so that it may obtain output voltage signal twice, so as to quickly monitor the capacity of filter capacitor and
ESR improves monitoring efficiency.
In a specific example, the first hopping edge signal can be failing edge signal, and the second hopping edge signal can be upper
It rises along signal.Likewise, it need to only obtain the control rising edge signal of signal and failing edge signal, so that it may obtain output electricity twice
Signal is pressed, so as to quickly monitor the capacity of filter capacitor and ESR, improves monitoring efficiency.
In a specific embodiment, it is as shown in figure 3, real for Switching Power Supply output filter capacitor monitoring device of the present invention
Apply the concrete structure schematic diagram of example.The device includes trigger circuit 310, measuring circuit (i.e. tension measuring circuit) 320 and processing
Module 330.Wherein：
Trigger circuit：It is mainly used for the generation to the output voltage sampling trigger signal of measured switch power module, so as to
It realizes and acquires output voltage in particular moment (the first hopping edge signal and the second hopping edge signal).
Measuring circuit：The AC compounent of the output voltage of measured switch power module is sampled, obtains output voltage
Ripple signal.
Processing module：The collected voltage data of measuring circuit is handled, calculates the filtered electrical of measured switch power module
Hold capacity C and ESR.
Specifically, measured switch power module (Buck (buck) types power module) passes through switch tube (triode) electricity
The control to output voltage is realized in the adjusting for being switched on and off time accounting of road M1.Since M1 is being switched on and off state
Under, current path can change, and can generate ripple on the output voltage, and subsequent conditioning circuit can be had an impact to ripple.For
Fixed load R2, power supply output ripple are related to the capacity C and ESR of filter capacitor C1.Therefore ripple signal is sampled, it can
To calculate the capacity C of filter capacitor C1 and ESR, so as to detect the state of the filter capacitor of measured switch power module.It is logical
It crosses and is turned to the trigger signal measured using the switching signal change of the switching tube of measured switch power module, triggering is greatly reduced
The complexity of circuit improves the application convenience of measurement.
It should be noted that measured switch power module can also be Boost other than Buck type power modules can be used
(boost type) type power module, Buck/Boost (buck/boost formula) type power module, Cuk types power module, Sepic types electricity
Source module or Zeta type power modules etc..
For the difference that the more specific description embodiment of the present invention is monitored with traditional Switching Power Supply output filter capacitor, such as
The specific work process of Switching Power Supply output filter capacitor monitoring device embodiment shown in Fig. 3 is：
1st, after power module normal work, output voltage mean value is maintained at stable state.Control signal CP is square wave at this time
Signal, duty ratio are determined by the ratio of input voltage and output voltage.
2nd, in CP rising edges, after being input to trigger circuit, trigger circuit can generate trigger signal (Trigger).
3rd, Trigger signals control ADC module is sampled, and is obtained and is measured output signal.
4th, measurement output signal is passed to processing module and is stored, data record A, corresponds to ripple voltage at this time as U
(0), i.e.,：U (0)=A/S-Uc, wherein S are the method multiple of measuring circuit transformer module, and Uc is left for measuring circuit transformer
Right two potential differences.
5th, on the lower falling-rising edge of CP, after being input to trigger circuit, trigger circuit can generate trigger signal Trigger.
6th, Trigger signals control ADC (Analog-to-Digital Converter, analog-digital converter) module carries out
Sampling obtains and measures output signal.
7th, measurement output signal is passed to processing module and is stored, data record B, corresponds to ripple voltage at this time as U
(D), i.e.,：U (D)=B/S-Uc.
8th, by data U (0) and U (D), the capacity C of filter capacitor C1 and ESR resistance values R can be calculatedesr。
In a specific embodiment, it is as shown in figure 4, real for Switching Power Supply output filter capacitor monitoring device of the present invention
Apply the trigger circuit structure schematic diagram of example.Trigger circuit includes trigger 410, exclusive or device 420 and delayer 430；
The signal output end of the first input end connection exclusive or device of trigger 410, the first output terminal connection delayer 430
One end, second output terminal connect the second input terminal of trigger 410；The first signal input part connection of exclusive or device 420 is to be measured to open
The control signal end of powered-down source module, second signal input terminal connect the other end of delayer 430；The signal of exclusive or device 420 is defeated
Outlet connects the signal input part of tension measuring circuit.
Specifically, the signal output end of exclusive or device, the connection of the first output terminal are connected by the first input end of trigger 410
One end of delayer 430, second output terminal connect the second input terminal of trigger 410；First signal input part of exclusive or device 420
The control signal end of measured switch power module is connected, second signal input terminal connects the other end of delayer 430；Exclusive or device
The signal input part of 420 signal output end connection tension measuring circuit.So as to which the first signal input part in exclusive or device 420 is defeated
Enter the control signal of measured switch power module, trigger signal can be exported from the signal output end of exclusive or device 420.
For example, the first signal input part of exclusive or device 420 is when receiving the first hopping edge signal, the first hopping edge signal
By the transformation of trigger 410 and delayer 430, the first trigger signal is exported in the signal output end of exclusive or device 420；Exclusive or device
For 420 the first signal input part when receiving the second hopping edge signal, the second hopping edge signal passes through trigger 410 and delay
The transformation of device 430 exports the second trigger signal in the signal output end of exclusive or device 420.By using measured switch power module
Switch controlled signal as trigger source, so as to significantly simplify the complexity of trigger circuit.
In a specific embodiment, trigger is d type flip flop, JK flip-flop or rest-set flip-flop.
Specifically, when trigger is d type flip flop, the signal of CP ends (triggering input terminal) connection exclusive or device of trigger is defeated
Outlet, Q ends (signal output end) connect one end of delayer, and Q ends (reverse signal output terminal) connects the D ends (signal of trigger
Input terminal)；The control signal end of the first signal input part connection measured switch power module of exclusive or device, second signal input terminal
Connect the other end of delayer；The signal input part of the signal output end connection tension measuring circuit of exclusive or device.It is in trigger
When JK flip-flop or rest-set flip-flop, JK flip-flop or rest-set flip-flop can be converted into d type flip flop, so as to fulfill corresponding function.
It should be noted that conventional trigger conversion method can be used, JK flip-flop or rest-set flip-flop are converted into D touches
Device is sent out, the connection relation of description JK flip-flop or rest-set flip-flop and other module devices is not repeated herein.
In a specific embodiment, it is as shown in figure 5, real for Switching Power Supply output filter capacitor monitoring device of the present invention
Apply the trigger circuit concrete structure schematic diagram of example.The trigger circuit may include an XOR gate, a d type flip flop, a delay
Unit is formed.The input signal CP of trigger circuit comes from control signal (the control signal control of measured switch power module
The switching tube of measured switch power module is switched on and off).The amount of delay of CP and d type flip flop output Q, which carries out exclusive or, to be obtained
To trigger signal Trigger.Preferably, delay unit can be used several buffers and form, and the amount of delay of delay unit can be by electricity
Pressure measuring circuit enable signal timing requirements are determined.So as to be made using the control signal saltus step of measured switch power module
For the trigger signal of measurement, the complexity of trigger circuit is greatly reduced, reduces monitoring cost, improve the convenient of measurement
Property.
The filter capacitor of traditional measurement measured switch power module, using the output voltage signal for special joint into
Row sampling.It is stringent for the triggering clock signal requirement of sample circuit, it is surveyed especially for the time at duty cycle of switching half
It measures more demanding, it is easy to cause time of measuring inaccurate, influence to calculate measurement accuracy, and then design trigger circuit more multiple
It is miscellaneous.
And the trigger circuit of the embodiment of the present invention can by the use of measured switch power module the saltus step of control signal as survey
The complexity of trigger circuit is greatly reduced in the trigger signal of amount, improves the application convenience of measurement.
In a specific embodiment, it is as shown in fig. 6, real for Switching Power Supply output filter capacitor monitoring device of the present invention
Apply the tension measuring circuit structure diagram of example.Tension measuring circuit may include acquisition module 610.
The signal output end of the control terminal connection trigger circuit of acquisition module 610, input terminal connect the output of filter capacitor
End, output terminal connection processing module.
Specifically, connecting the signal output end of trigger circuit by the control terminal of acquisition module 610, input terminal connection is to be measured
The output terminal of the filter capacitor of switch power module, output terminal connection processing module.So as to input triggering letter in acquisition module 610
When number (the first trigger signal or the second trigger signal), voltage sample is carried out to the filter capacitor of measured switch power module, it can
Export sampled signal (the first output voltage signal or the second output voltage signal).Preferably, acquisition module 610 can be ADC
Acquisition module.Measured switch power module filter capacitor is acquired so as to which one group of acquisition module 610 only be needed to achieve that, into
And simplify observation circuit.
In a specific embodiment, as shown in fig. 6, tension measuring circuit can further include amplifier 620.
The output terminal of the input terminal connection filter capacitor of amplifier 620, output terminal connect the input terminal of acquisition module.
Specifically, the output terminal of the filter capacitor of measured switch power module is connected by the input terminal of amplifier 620, it is defeated
Outlet connects the input terminal of acquisition module.So as to realize the holding to signal, the driving force of output signal is improved.
In a specific embodiment, amplifier is Isolation Amplifier Module or non-isolated amplification module.
Specifically, amplifier can be Isolation Amplifier Module, so as to isolated DC and the noise of reduction input signal
Interference；Amplifier can also be non-Isolation Amplifier Module, directly measure the filter capacitor output voltage of measured switch power module
Signal, so as to further simplify observation circuit.
In a specific embodiment, Isolation Amplifier Module amplifies mould for transformer isolation amplification module or light-coupled isolation
Block.
Specifically, transformer isolation amplification module can be made of transformer and basic amplifier, by transformer to be measured
The filter capacitor output voltage signal of switch power module carries out noise isolation and DC isolation, by basic amplifier to signal
It is followed, improves the driving force of output signal.Light-coupled isolation amplification module can be by light-coupled isolation chip and basic amplifier
It forms, carries out noise isolation and straight to the filter capacitor output voltage signal of measured switch power module by light-coupled isolation chip
Stream isolation, follows signal by basic amplifier, improves the driving force of output signal.
In a specific embodiment, it is as shown in fig. 7, real for Switching Power Supply output filter capacitor monitoring device of the present invention
Apply the tension measuring circuit concrete structure schematic diagram of example.Tension measuring circuit may include transformer, amplifier Ap and ADC acquisition mould
Block.Wherein the input terminal of transformer receives the output voltage of measured switch power module.The output voltage passes through the reality of transformer
Existing isolated DC, and AC signal is amplified.Amplified AC signal carries out equimultiple amplification output by amplifier Ap.
Output signal is sampled by ADC acquisition modules.The sampling instant of ADC acquisition modules can by Trigger (the first trigger signal and
Second trigger signal) signal deciding.In digital data transmission to processing module below after sampling.
In a specific embodiment, it is as shown in figure 8, real for Switching Power Supply output filter capacitor monitoring method of the present invention
Apply the flow diagram of example 1.Include the following steps：
Step S810, the first output voltage signal and the second output voltage signal of the transmission of receiving voltage measuring circuit；The
One output voltage signal is receiving first hopping edge of the trigger circuit according to measured switch power module for tension measuring circuit
During the first trigger signal of signal generation, it is obtained that sampled measurements are carried out to the output voltage of filter capacitor；Second output electricity
Pressure signal is receiving second hopping edge signal generation of the trigger circuit according to measured switch power module for tension measuring circuit
The second trigger signal when, it is obtained that sampled measurements are carried out to the output voltage of filter capacitor.
Step S820 handles the first output voltage signal and the second output voltage signal, obtain filter capacitor capacity and
ESR。
Specifically, processing module can receiving voltage measuring circuit transmission the first output voltage signal and the second output voltage
Signal；And pass through the first output voltage signal of processing and the second output voltage signal, so as to quickly obtain the appearance of filter capacitor
Amount and ESR.And then effectively improve monitoring capacity to measured switch power module state.
In a specific embodiment, the first hopping edge signal is rising edge signal；Second hopping edge signal is declines
Along signal.
In a specific embodiment, by Fig. 3 to Buck types power module monitor for, processing module it is specific
Processing procedure is：
Output ripple can be expressed as at two moment of rising edge and failing edge：
Wherein U (0) is the ripple voltage of rising edge, and U (D) is the ripple voltage of failing edge, the duty ratio of D signals in order to control
(the switching tube M1 opening times account for the ratio of whole cycle), UoFor output voltage mean value, fsThe frequency of signal in order to control, L are to be measured
The inductance value of switch power module, capacity of the C for filter capacitor C1, ResrESR resistance values for filter capacitor C1.
The capacity C of filter capacitor C1 and the R of ESR can be obtained by above formulaesrFor：
Preferably, in order to improve computational accuracy, the data record value U (0) of multiple rising edge times can be measured1, U (0)2,
U(0)3....U(0)n；And the data record value U (D) at multiple failing edge moment1, U (D)2, U (D)3....U(D)n.Wherein n tables
Show several rising edges or failing edge moment, calculate its average value：
Wherein, what i was represented is 1 to n rising edge or one of them moment in the failing edge moment.And it is substituted using mean value
Instantaneous value (U (0) and U (D)), i.e., computational methods are as follows：
Above-mentioned each embodiment of Switching Power Supply output filter capacitor monitoring method, by believing the first output voltage received
Number and the second output voltage signal handled, so as to quickly obtain the capacity of filter capacitor and ESR.Reduce monitoring into
This, can effectively promote the monitoring capacity of measured switch power module state.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.One of ordinary skill in the art will appreciate that realize above-mentioned implementation
All or part of step in example method is relevant hardware can be instructed to complete by program, and the program can deposit
Be stored in a computer read/write memory medium, the program when being executed, including the step described in above method, the storage
Medium, such as：ROM/RAM, magnetic disc, CD etc..
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of Switching Power Supply output filter capacitor monitoring device, which is characterized in that including trigger circuit, tension measuring circuit and
Processing module；The trigger circuit input terminal connection measured switch power module control signal end, output terminal connection described in
The signal input part of tension measuring circuit；The measurement input terminal of the tension measuring circuit connects the measured switch power module
Filter capacitor output terminal, measure output terminal and connect the processing module；
The trigger circuit by the first hopping edge signal inputted according to the measured switch power module, generation first triggering
Signal transmission gives the tension measuring circuit；The tension measuring circuit is when receiving first trigger signal, to described
The output voltage of filter capacitor carries out sampled measurements, and the first obtained output voltage signal is transferred to the processing module；
The trigger circuit by according to the measured switch power module the second hopping edge signal, generation the second trigger signal
It is transferred to the tension measuring circuit；The tension measuring circuit is when receiving second trigger signal, to the filtering
The output voltage of capacitance carries out sampled measurements, and the second obtained output voltage signal is transferred to the processing module；
The processing module handles first output voltage signal and second output voltage signal, obtains the filtered electrical
The capacity and ESR of appearance.
2. Switching Power Supply output filter capacitor monitoring device according to claim 1, which is characterized in that first saltus step
It is rising edge signal along signal；Second hopping edge signal is failing edge signal.
3. Switching Power Supply output filter capacitor monitoring device according to claim 1 or 2, which is characterized in that the triggering
Circuit includes trigger, exclusive or device and delayer；
The first input end of the trigger connects the signal output end of the exclusive or device, and the first output terminal connects the delayer
One end, second output terminal connects the second input terminal of the trigger；The first signal input part connection institute of the exclusive or device
The control signal end of measured switch power module is stated, second signal input terminal connects the other end of the delayer；The exclusive or
The signal output end of device connects the signal input part of the tension measuring circuit.
4. Switching Power Supply output filter capacitor monitoring device according to claim 3, which is characterized in that the trigger is
D type flip flop, JK flip-flop or rest-set flip-flop.
5. Switching Power Supply output filter capacitor monitoring device according to claim 1 or 2, which is characterized in that the voltage
Measuring circuit includes acquisition module；
The control terminal of the acquisition module connects the signal output end of the trigger circuit, and input terminal connects the filter capacitor
Output terminal, output terminal connect the processing module.
6. Switching Power Supply output filter capacitor monitoring device according to claim 5, which is characterized in that the voltage measurement
Circuit further includes amplifier；
The input terminal of the amplifier connects the output terminal of the filter capacitor, and output terminal connects the input of the acquisition module
End.
7. Switching Power Supply output filter capacitor monitoring device according to claim 6, which is characterized in that the amplifier is
Isolation Amplifier Module or non-isolated amplification module.
8. Switching Power Supply output filter capacitor monitoring device according to claim 7, which is characterized in that the isolation amplification
Module is transformer isolation amplification module or light-coupled isolation amplification module.
9. a kind of Switching Power Supply output filtered electrical based on Switching Power Supply output filter capacitor monitoring device described in claim 1
Hold monitoring method, which is characterized in that include the following steps：
The first output voltage signal and the second output voltage signal of receiving voltage measuring circuit transmission；First output voltage
Signal is receiving first hopping edge signal life of the trigger circuit according to measured switch power module for the tension measuring circuit
Into the first trigger signal when, it is obtained that sampled measurements are carried out to the output voltage of filter capacitor；Second output voltage
Signal is receiving second saltus step of the trigger circuit according to the measured switch power module for the tension measuring circuit
During the second trigger signal generated along signal, it is obtained that sampled measurements are carried out to the output voltage of the filter capacitor；
Handle first output voltage signal and second output voltage signal, obtain the filter capacitor capacity and
ESR。
10. Switching Power Supply output filter capacitor monitoring method according to claim 9, which is characterized in that described first jumps
Become along signal as rising edge signal；Second hopping edge signal is failing edge signal.
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Cited By (3)
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| 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 |
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