CN208172117U - Frequency-converter ageing tester and system - Google Patents
Frequency-converter ageing tester and system Download PDFInfo
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- CN208172117U CN208172117U CN201820415779.7U CN201820415779U CN208172117U CN 208172117 U CN208172117 U CN 208172117U CN 201820415779 U CN201820415779 U CN 201820415779U CN 208172117 U CN208172117 U CN 208172117U
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Abstract
The utility model discloses a kind of frequency-converter ageing tester and system, the frequency-converter ageing tester includes：Reactance module, ADC sampling module and PWM control module；The reactance module includes the inductance of multiple parallel connections, and the first end of the inductance of the multiple parallel connection is connected with each other, and the second end of each inductance is separately connected the load input terminal connecting one by one with the voltage output end of the bridge arm of the inverter circuit of frequency converter；The ADC sampling module is used to sample the electric current of the lower bridge arm of each bridge arm of the inverter circuit and the form that the electric current sampled is converted into voltage is exported sampled voltage signal to the PWM control module；The PWM control module is for receiving the sampled voltage signal, the duty ratio for controlling the pwm signal of each switching tube of the inverter circuit is calculated according to the sampled voltage signal, and the pwm signal after output adjustment duty ratio gives the switching tube of the corresponding inverter circuit of the pwm signal.The utility model realizes that frequency converter low-power is simple, inexpensive aging.
Description
Technical field
The utility model belongs to frequency converter aging field, and in particular to a kind of frequency-converter ageing tester and system.
Background technique
Air-conditioning frequency conversion drive plate needs to be tested for the property frequency converter before factory, and burn-in test is exactly analog inverter
Actual operation process with the inverter of test frequency converter and driving circuit whether stable operation, burn-in test is frequency converter reliability
A very important link in test.
But in the prior art, when carrying out aging to air conditioning frequency converter, it is necessary to run air conditioner and carry out aging, make
It is complicated to obtain the installation process when carrying out frequency converter burn-in test, and due to driving in air-conditioning during complete machine carries out aging
Portion's motor operates together so that aging power up to kilowatt, cause aging at high cost.
Utility model content
The purpose of this utility model is to provide a kind of frequency-converter ageing tester and system, realizes frequency converter low-power
Simply, inexpensive aging.
In order to solve the above technical problems, the utility model embodiment provides a kind of frequency-converter ageing tester, including：Electricity
Anti- module, ADC sampling module and PWM control module；
The reactance module has negative for connecting one by one with the voltage output end of the bridge arm of the inverter circuit of frequency converter
Carry input terminal；The reactance module includes the inductance of multiple parallel connections, and the first end of the inductance of the multiple parallel connection is connected with each other, and
The second end of each inductance is separately connected a load input terminal；
The ADC sampling module is used to sample the electric current of the lower bridge arm of each bridge arm of the inverter circuit and will sample
Electric current be converted into the form of voltage and export sampled voltage signal to the PWM control module；
The PWM control module is used for for receiving the sampled voltage signal according to sampling point sample signal calculating
The duty ratio of the pwm signal of each switching tube of the inverter circuit is controlled, and the pwm signal after output adjustment duty ratio is given
The switching tube of the inverter circuit corresponding with the pwm signal.
Preferably, the inverter circuit is three-phase inverter；Wherein, the three-phase inverter includes the first bridge arm, second
Bridge arm and third bridge arm,
The upper bridge arm of first bridge arm is provided with first switch tube, and lower bridge arm is provided with second switch；Described first
The output end of switching tube is connect with the first voltage output end；The upper bridge arm of second bridge arm is provided with third switching tube,
Lower bridge arm is provided with the 4th switching tube；The output end of the third switching tube is connect with the second voltage output end；Described
The upper bridge arm of three bridge arms is provided with the 5th switching tube, and lower bridge arm is provided with the 6th switching tube；The output end of 5th switching tube
It is connect with the tertiary voltage output end.
Further, the PWM control module has six road pwm signal of output adjustment duty ratio Hou to the inversion electricity
Six pwm signal output ends of corresponding six switching tubes in road；Wherein,
Six controlled ends of six pwm signal output ends and the inverter circuit connect one to one；It is each described
The corresponding switching tube for controlling the inverter circuit of controlled end.
Further, the inverter circuit includes N number of bridge arm, and the ADC sampling module includes at least N-1 sampling electricity
Road；Each sample circuit includes：First resistor, second resistance, 3rd resistor, the 4th resistance and operational amplifier；The sampling
Circuit has power input, sampling end and current signal output end；
The sampling end is used to sample the electric current of the lower bridge arm of the inverter circuit bridge arm；The current signal output end is used
In by the electric current sampled be sent to the ADC sampling module be converted into voltage form export；
The first end of the first resistor is connect with the sampling end, and the second end of the first resistor is put with the operation
The inverting input terminal connection of big device；The non-inverting input terminal of the operational amplifier is connect with the first end of the first resistor, institute
The positive power source terminal for stating operational amplifier is connect with the first end of the second resistance, the negative supply termination of the operational amplifier
Ground, the output end of the operational amplifier are connect with the current signal output end；The first end of the second resistance with it is described
Power input connection；The second end of the second resistance is connect with the non-inverting input terminal of the operational amplifier；The third
The first end of resistance is connect with the non-inverting input terminal of the operational amplifier, the second end ground connection of the 3rd resistor；Described
The first end of four resistance is connect with the inverting input terminal of first operational amplifier, the second end of the 4th resistance with it is described
The output end of first operational amplifier connects.
Further, the sample circuit further includes：5th resistance, the 6th resistance, first capacitor and the second capacitor；
5th resistance be connected to the first resistor first end and the operational amplifier non-inverting input terminal it
Between；6th resistance is connected between the second end of the first resistor and the inverting input terminal of the operational amplifier；Institute
The first end for stating first capacitor is connect with the first end of the 5th resistance, the second end of the first capacitor and the 6th electricity
The first end of resistance connects；The first end of second capacitor is connect with the first end of the 4th resistance, second capacitor
Second end is connect with the second end of the 4th resistance.
Further, the frequency converter further includes rectification filtering module and third capacitor；
The rectification filtering module has power input, the first output end and second output terminal；The rectifying and wave-filtering mould
First output end of block is connect with the first end of the third capacitor, the second output terminal ground connection of the rectification filtering module；Institute
State the second end ground connection of third capacitor；The rectification filtering module is used for inverter circuit described in the power input after rectifying and wave-filtering
Power input；The third capacitor is used to fill the reactance module by the power input for connecting the inverter circuit
Energy feedback is realized in electric discharge.
Further, the frequency-converter ageing tester further includes connecting with the output end of the PWM control module
Drive module；
The pwm signal for the PWM control module output that the drive module is used to receive amplifies, and will put
Pwm signal output after big gives the switching tube of the corresponding inverter circuit of the pwm signal.
The utility model embodiment also provides a kind of frequency converter aging testing system, including frequency converter and for the change
The frequency-converter ageing tester of frequency device progress burn-in test；The frequency converter includes inverter circuit.
Compared with the prior art, a kind of frequency-converter ageing tester of the utility model and the beneficial effect of system exist
In：The frequency-converter ageing tester includes the reactance module, the ADC sampling module and the PWM control module；Institute
State multiple shunt inductances in reactance module connect one to one frequency converter inverter circuit each bridge arm voltage output end；
The electric current of the lower bridge arm of each bridge arm of the inverter circuit of the ADC sampling module sampling frequency converter and the electricity for obtaining sampling
The form that circulation changes voltage into exports sampled voltage signal to the PWM control module；The PWM control module is adopted according to
The error signal that sample voltage signal obtains compared with weathering criteria voltage reference value opens each for controlling the inverter circuit
The pwm signal for closing pipe is adjusted, and calculates the duty ratio for controlling the pwm signal of each switching tube of the inverter circuit, and
Pwm signal after output adjustment duty ratio gives the switching tube of the corresponding inverter circuit of the pwm signal；Pass through the PWM
What the pwm signal of control module output controlled each switching tube in the inverter circuit opens closing and service time, low
The realization of aging high current is generated to the big electricity of the frequency converter to inductance excitations multiple in the reactance module in the case where voltage
High temperature ageing is flowed, solves the problems, such as the complicated installation of complete machine access circuit operation progress aging and high power when frequency converter aging, it is real
Existing frequency converter low-power is simple, inexpensive aging.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of frequency-converter ageing tester provided by the utility model；
Fig. 2 is the structural schematic diagram of another embodiment of frequency-converter ageing tester provided by the utility model；
Fig. 3 is the ADC sampling module of another embodiment of frequency-converter ageing tester provided by the utility model
Physical circuit schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
It is the structural schematic diagram of frequency-converter ageing tester provided by the utility model referring to Fig. 1, the frequency converter aging
Test device includes：Reactance module 10, ADC sampling module 20 and PWM control module 30；
The reactance module 10 has for connecting one by one with the voltage output end of the bridge arm of the inverter circuit 40 of frequency converter
Load input terminal；The reactance module 10 includes the inductance of multiple parallel connections, and the first end of the inductance of the multiple parallel connection is mutual
Connection, and the second end of each inductance is separately connected a load input terminal；
The ADC sampling module 20 is used to sample the electric current of the lower bridge arm of each bridge arm of the inverter circuit 40 and will adopt
Sample to electric current be converted into the form of voltage and export sampled voltage signal to the PWM control module 30；
The PWM control module 30 is calculated according to the sampling point sample signal and is used for receiving the sampled voltage signal
In the duty ratio of the pwm signal for each switching tube for controlling the inverter circuit, and the pwm signal after output adjustment duty ratio
Give the switching tube of the corresponding inverter circuit 40 of the pwm signal.
It should be noted that a kind of frequency-converter ageing tester provided by the utility model, including the reactance module,
The ADC sampling module and the PWM control module；Multiple shunt inductances in the reactance module connect one to one frequency conversion
The voltage output end of each bridge arm of the inverter circuit of device；The inverter circuit of the ADC sampling module sampling frequency converter it is each
The form that the electric current that sampling obtains is converted into voltage is simultaneously exported sampled voltage signal to described by the electric current of the lower bridge arm of a bridge arm
PWM control module；The PWM control module obtains compared with weathering criteria voltage reference value according to the sampled voltage signal
Error signal is adjusted the pwm signal for each switching tube for controlling the inverter circuit, calculates and controls the inversion electricity
The duty ratio of the pwm signal of each switching tube on road, and the pwm signal after output adjustment duty ratio gives the pwm signal pair
The switching tube for the inverter circuit answered；It is controlled in the inverter circuit by the pwm signal that the PWM control module exports
Each switching tube opens closing and service time, raw to inductance excitations multiple in the reactance module in the case where low-voltage
The high current high temperature ageing to the frequency converter is realized at aging high current, solves complete machine access circuit operation when frequency converter aging
The complicated installation and high power problem for carrying out aging realize that frequency converter low-power is simple, inexpensive aging.
As shown in Fig. 2, being that the structure of another embodiment of frequency-converter ageing tester provided by the utility model is shown
It is intended to.
Frequency-converter ageing tester provided in this embodiment on the basis of the above embodiments, has advanced optimized part
The structure of functional circuit, it is specific as follows：
Preferably, the inverter circuit is three-phase inverter；Wherein, the three-phase inverter includes the first bridge arm, second
Bridge arm and third bridge arm,
The upper bridge arm of first bridge arm is provided with first switch tube Q1, and lower bridge arm is provided with second switch Q2；It is described
The output end of first switch tube Q1 is connect with the first voltage output end；The upper bridge arm of second bridge arm is provided with third and opens
Pipe Q3 is closed, lower bridge arm is provided with the 4th switching tube Q4；The output end and the second voltage output end of the third switching tube Q3
Connection；The upper bridge arm of the third bridge arm is provided with the 5th switching tube Q5, and lower bridge arm is provided with the 6th switching tube Q6；Described 5th
The output end of switching tube Q5 is connect with the tertiary voltage output end.
Further, the PWM control module 30 has six road pwm signal of output adjustment duty ratio Hou to the inversion
Six pwm signal output ends of 40 corresponding six switching tubes of circuit；Wherein,
Six controlled ends of six pwm signal output ends and the inverter circuit 40 connect one to one；Each institute
State the corresponding switching tube for controlling the inverter circuit 40 of controlled end.
In another embodiment of the utility model, the inverter circuit 40 of the frequency converter is three-phase inverter, then institute
Stating corresponding three bridge arms of inverter circuit 40, there are three voltage output ends.There are three inductance in parallel, institutes for the tool of reactance module 10
The second end of the first inductance U for stating reactance module is connect with the first load input terminal of the reactance module, the reactance module
The second end of the second inductance V connect with the second load input terminal of the reactance module, the third inductance W of the reactance module
Second end connect with the third load input terminal of the reactance module；The first end of the first inductance U and second electricity
Feel the first end connection of V, the first end of the third inductance W is connect with the first end of the second inductance V；The reactance module
The voltage output end of 10 load input terminal and each bridge arm of the inverter circuit 40 connects one to one.The inverter circuit
40 each controlled end is connected with the control terminal of the switching tube of corresponding control, and the switching tube of the inverter circuit 40 is IGBT switch
Pipe, the control terminal of the switching tube of the inverter circuit 40 are the grid of IGBT switching tube, and the input terminal of the switching tube is IGBT
The drain electrode of switching tube, the output end of the switching tube are the source electrode of IGBT switching tube.
Further, the inverter circuit 40 includes N number of bridge arm, and the ADC sampling module 20 includes at least N-1 and adopts
Sample circuit；Each sample circuit includes：First resistor, second resistance, 3rd resistor, the 4th resistance and operational amplifier；It is described
Sample circuit has power input, sampling end and current signal output end；
The sampling end is used to sample the electric current of the lower bridge arm of the inverter circuit bridge arm；The current signal output end is used
In by the electric current sampled be sent to the ADC sampling module be converted into voltage form export；
The first end of the first resistor is connect with the sampling end, and the second end of the first resistor is put with the operation
The inverting input terminal connection of big device；The non-inverting input terminal of the operational amplifier is connect with the first end of the first resistor, institute
The positive power source terminal for stating operational amplifier is connect with the first end of the second resistance, the negative supply termination of the operational amplifier
Ground, the output end of the operational amplifier are connect with the current signal output end；The first end of the second resistance with it is described
Power input connection；The second end of the second resistance is connect with the non-inverting input terminal of the operational amplifier；The third
The first end of resistance is connect with the non-inverting input terminal of the operational amplifier, the second end ground connection of the 3rd resistor；Described
The first end of four resistance is connect with the inverting input terminal of first operational amplifier, the second end of the 4th resistance with it is described
The output end of first operational amplifier connects.
Further, the sample circuit further includes：5th resistance, the 6th resistance, first capacitor and the second capacitor；
5th resistance be connected to the first resistor first end and the operational amplifier non-inverting input terminal it
Between；6th resistance is connected between the second end of the first resistor and the inverting input terminal of the operational amplifier；Institute
The first end for stating first capacitor is connect with the first end of the 5th resistance, the second end of the first capacitor and the 6th electricity
The first end of resistance connects；The first end of second capacitor is connect with the first end of the 4th resistance, second capacitor
Second end is connect with the second end of the 4th resistance.
It is the ADC sampling of another embodiment of frequency-converter ageing tester provided by the utility model as shown in Figure 3
The physical circuit schematic diagram of module.In another embodiment of the utility model, the inverter circuit 40 of the frequency converter is three
Phase inverter, then the ADC sampling module 20 includes 2 sample circuits, in the first sample circuit of the ADC sampling module 20
In the first end of the first resistor R1 connect with first sampling end, first sampling end and the inverter module 40
In second switch output end connection；The first resistor in the second sample circuit of the ADC sampling module 20
The first end of R10 is connect with second sampling end, the 4th switching tube in second sampling end and the inverter module 40
Output end connection.The power input of first sample circuit and second sample circuit accesses 3.3V DC voltage.
By taking first sample circuit as an example, the first end of the first resistor R1 is connect with the sampling end, and described
The second end of one resistance R1 is connect with the inverting input terminal of the operational amplifier U1；The homophase input of the operational amplifier U1
End is connect with the first end of the first resistor R1, and the of the positive power source terminal of the operational amplifier U1 and the second resistance R3
One end connection, the negative power end ground connection of the operational amplifier U1, the output end and the electric current of the operational amplifier U1 are believed
The connection of number output end；The first end of the second resistance R3 is connect with the power input；The second of the second resistance R3
End is connect with the non-inverting input terminal of the operational amplifier U1；The first end of the 3rd resistor R4 and the operational amplifier U1
Non-inverting input terminal connection, the 3rd resistor R4 second end ground connection；The first end and described first of the 4th resistance R5
The inverting input terminal of operational amplifier connects, the second end of the 4th resistance R5 and the output end of first operational amplifier
Connection.The 5th resistance R6 is connected to the first end of the first resistor R1 and the non-inverting input terminal of the operational amplifier U1
Between；The 6th resistance R7 is connected to the second end of the first resistor R1 and the inverting input terminal of the operational amplifier U1
Between；The first end of the first capacitor C4 is connect with the first end of the 5th resistance R6, and the second of the first capacitor C4
End is connect with the first end of the 6th resistance R7；The first end of the second capacitor C1 and the first end of the 4th resistance R5
Connection, the second end of the second capacitor C1 are connect with the second end of the 4th resistance R5.
Further, the frequency converter further includes rectification filtering module 60 and third capacitor E1；
The rectification filtering module 60 has power input, the first output end and second output terminal；The rectifying and wave-filtering
First output end of module 60 is connect with the first end of the third capacitor E1, the second output terminal of the rectification filtering module 60
Ground connection；The second end of the third capacitor E1 is grounded；The rectification filtering module 60 is used for the power input after rectifying and wave-filtering
The power input of the inverter circuit 40；The third capacitor E1 is used for the power input by connecting the inverter circuit 40
Are realized to 10 charge and discharge of reactance module by energy feedback for end.
In another embodiment of the utility model, the inverter circuit 40 of the frequency converter is three-phase inverter, described
The second switch Q2 of the first sample circuit in ADC sampling module 20 to the lower bridge arm of the first bridge arm of the inverter circuit 40
Current sample is carried out, the second sample circuit in the ADC sampling module 20 is under the second bridge arm of the inverter circuit 40
4th switching tube Q4 of bridge arm carries out current sample；Especially by the voltage of the first resistor sampling bridge arm in the sample circuit
Value, the voltage value sampled are sent to digital signal processing module after the operational amplifier in over-sampling circuit amplifies
DSP is handled, and the DSP digital signal processing module is according to the first sample voltage value and the second sample voltage value pro rata
It calculates and obtains the real-time current I that the first bridge arm lower bridge arm of the inverter circuit 40 flows throughaThe reality flowed through with the second bridge arm lower bridge arm
When electric current Ib, according to three bridge arm lower bridge arm electric current rule I of three-phase invertera+b+c=0, it can get the inverter circuit 40
The real-time current I that third bridge arm lower bridge arm flows throughc；The first bridge arm lower bridge arm electric current I that real-time sampling is obtaineda, under the second bridge arm
Bridge arm current IbWith third bridge arm lower bridge arm electric current IcCurrent amplitude and phase be compared with frequency converter weathering criteria reference value
Error signal is obtained, and estimates that the switch change-over of the switching tube of the inverter circuit 40 next time should reach according to the error signal
The current transformation value arrived, finally by the current transformation value carry out conversion export the 40 first bridge arm lower bridge arm of inverter circuit,
Next given voltage V of second bridge arm lower bridge arm and third bridge arm lower bridge arma、VbAnd VcTo the PWM control module；The PWM
Each of control module 30 according to the sample voltage value received by the SVPWM algorithm calculating control inverter circuit 40 is opened
The duty ratio of the pwm signal of pipe is closed, and the pwm signal after output adjustment duty ratio gives the corresponding inversion of the pwm signal
Six switching tubes of circuit 40.
In another embodiment of the utility model, six switching tubes of the inverter circuit 40 are controlled by the PWM
Pwm signal after the adjustment duty ratio that control module 30 exports, when PWM drive signal controls first in the inverter circuit 40
Switching tube Q1, the 4th switching tube Q4 and the 6th switching tube Q6 are open-minded, second switch Q2, third switching tube Q3 and the 5th switching tube
When Q5 is turned off, the voltage on the third capacitor E1 connecting at this time with the power input of the inverter circuit 40 passes through described
First switch tube Q1 inputs after the first inductance U, the second inductance V and third inductance W of the reactance module 10 output to described the
Four switching tube Q4 and the 6th switching tube Q6, form the energized circuit of three inductance in the reactance module 10, by third electricity
The voltage held in E1 is converted to inductance magnetic energy, so that the first inductance U of the reactance module 10, the second inductance V and third inductance W
Excitation generates exciting current；When PWM drive signal controls the shutdown of six switching tubes in the inverter circuit 40, due to Lenz
Law, the first inductance U, the second inductance V of the reactance module 10 and the electromotive force of third inductance W are reversed, pass through described second
The internal diode of switching tube Q2, third switching tube Q3 and the 5th switching tube Q5 formed current loop to the third capacitor E1 into
Row reverse charging, the reactance module 10 and third capacitor E1 form LC oscillation, realize energy feedback.
In another embodiment of the utility model, by V*Ton=L* Δ i, (wherein V is bridge arm lower bridge arm voltage；Ton
For service time；L is inductance；Δ i is bridge arm lower bridge arm electric current) it is found that PWM drive signal controls in the inverter circuit 40
The size of switching tube service time adjustable current, when to control the switching tube in the inverter circuit 40 open-minded for PWM drive signal
Time is longer, and the long obtained exciting current of the excitation time of inductance is bigger in the reactance module 10, and realization is mentioned to frequency converter
For aging high current, without driving the compressor of the air conditioner where the frequency converter that can reach identical aging current value.
And the switching tube of the inverter circuit 40 has high current logical when the reactance module 10 carries out charge and discharge to third capacitor E1
It crosses, since 10 load impedance of reactance module is small, major power loss is that 10 internal resistance of reactance module is lost, so that only needing
Aging high current can be obtained by providing low-voltage, and the frequency-converter ageing tester low-power carries out the frequency converter old
Change.
Further, the frequency-converter ageing tester further includes connecting with the output end of the PWM control module
Drive module 50；
The drive module 50 is used to amplify the pwm signal that the PWM control module 30 received exports, and
The output of amplified pwm signal is given to the switching tube of the corresponding inverter circuit 40 of the pwm signal.In the utility model reality
It applies in example, the low-voltage PWM drive signal that the PWM control module 30 exports is amplified to suitable driving by the drive module 50
The PWM drive signal of the 15V voltage of IGBT switching tube in the inverter circuit 40.
The utility model embodiment also provides a kind of frequency converter aging testing system, including frequency converter and for the change
The frequency-converter ageing tester of frequency device progress burn-in test；The frequency converter includes inverter circuit 40.
In conclusion a kind of frequency-converter ageing tester of the utility model and the beneficial effect of system are：It is described
Frequency-converter ageing tester includes the reactance module, the ADC sampling module and the PWM control module；The reactance
Multiple shunt inductances in module connect one to one frequency converter inverter circuit each bridge arm voltage output end；It is described
The electric current of the lower bridge arm of each bridge arm of the inverter circuit of ADC sampling module sampling frequency converter and the electric current for obtaining sampling turn
The form for changing voltage into exports sampled voltage signal to the PWM control module；The PWM control module is according to the sampling electricity
The error signal that pressure signal obtains compared with weathering criteria voltage reference value is to each switching tube for controlling the inverter circuit
Pwm signal be adjusted, calculate the duty ratio for controlling the pwm signal of each switching tube of the inverter circuit, and export
Pwm signal after adjustment duty ratio gives the switching tube of the corresponding inverter circuit of the pwm signal；It is controlled by the PWM
What the pwm signal of module output controlled each switching tube in the inverter circuit opens closing and service time, in low-voltage
In the case where to inductance excitations multiple in the reactance module generate aging high current realize it is high to the high current of the frequency converter
Warm aging solves the problems, such as the complicated installation of complete machine access circuit operation progress aging and high power when frequency converter aging, realizes and become
Frequency device low-power is simple, inexpensive aging.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (8)
1. a kind of frequency-converter ageing tester, which is characterized in that including：Reactance module, ADC sampling module and PWM control mould
Block；
The reactance module has the load for connecting one by one with the voltage output end of the bridge arm of the inverter circuit of frequency converter defeated
Enter end；The reactance module includes the inductance of multiple parallel connections, and the first end of the inductance of the multiple parallel connection is connected with each other, and each
The second end of a inductance is separately connected a load input terminal；
The electricity that the ADC sampling module is used to sample the electric current of the lower bridge arm of each bridge arm of the inverter circuit and will sample
The form that circulation changes voltage into exports sampled voltage signal to the PWM control module；
The PWM control module is calculated according to the sampled voltage signal for controlling for receiving the sampled voltage signal
The duty ratio of the pwm signal of each switching tube of the inverter circuit, and the pwm signal after output adjustment duty ratio gives this
The switching tube of the corresponding inverter circuit of pwm signal.
2. frequency-converter ageing tester as described in claim 1, which is characterized in that the inverter circuit is three-phase inversion
Device；Wherein, the three-phase inverter includes the first bridge arm, the second bridge arm and third bridge arm,
The upper bridge arm of first bridge arm is provided with first switch tube, and lower bridge arm is provided with second switch；The first switch
The output end of pipe is connect with first voltage output end；The upper bridge arm of second bridge arm is provided with third switching tube, and lower bridge arm is set
It is equipped with the 4th switching tube；The output end of the third switching tube is connect with second voltage output end；The upper bridge of the third bridge arm
Arm is provided with the 5th switching tube, and lower bridge arm is provided with the 6th switching tube；The output end and tertiary voltage of 5th switching tube are defeated
Outlet connection.
3. frequency-converter ageing tester as claimed in claim 2, which is characterized in that the PWM control module has output
Six road pwm signal of duty ratio Hou is adjusted to six pwm signal output ends of corresponding six switching tubes of the inverter circuit；Its
In,
Six controlled ends of six pwm signal output ends and the inverter circuit connect one to one；It is each described controlled
The corresponding switching tube for controlling the inverter circuit in end.
4. frequency-converter ageing tester as described in claim 1, which is characterized in that the inverter circuit includes N number of bridge arm,
The ADC sampling module includes at least N-1 sample circuit；Each sample circuit includes：First resistor, second resistance, third
Resistance, the 4th resistance and operational amplifier；The sample circuit has power input, sampling end and current signal output end；
The sampling end is used to sample the electric current of the lower bridge arm of the inverter circuit bridge arm；The current signal output end is used for will
The electric current sampled is sent to the form output that the ADC sampling module is converted into voltage；
The first end of the first resistor is connect with the sampling end, the second end of the first resistor and the operational amplifier
Inverting input terminal connection；The non-inverting input terminal of the operational amplifier is connect with the first end of the first resistor, the fortune
The positive power source terminal for calculating amplifier is connect with the first end of the second resistance, the negative power end ground connection of the operational amplifier, institute
The output end for stating operational amplifier is connect with the current signal output end；The first end of the second resistance and the power supply are defeated
Enter end connection；The second end of the second resistance is connect with the non-inverting input terminal of the operational amplifier；The 3rd resistor
First end is connect with the non-inverting input terminal of the operational amplifier, the second end ground connection of the 3rd resistor；4th resistance
First end connect with the inverting input terminal of the operational amplifier, the second end of the 4th resistance and the operational amplifier
Output end connection.
5. frequency-converter ageing tester as claimed in claim 4, which is characterized in that the sample circuit further includes：5th
Resistance, the 6th resistance, first capacitor and the second capacitor；
5th resistance is connected between the first end of the first resistor and the non-inverting input terminal of the operational amplifier；Institute
The 6th resistance is stated to be connected between the second end of the first resistor and the inverting input terminal of the operational amplifier；Described first
The first end of capacitor is connect with the first end of the 5th resistance, and the of the second end of the first capacitor and the 6th resistance
One end connection；The first end of second capacitor is connect with the first end of the 4th resistance, the second end of second capacitor
It is connect with the second end of the 4th resistance.
6. frequency-converter ageing tester as described in claim 1, which is characterized in that the frequency converter further includes rectifying and wave-filtering
Module and third capacitor；
The rectification filtering module has power input, the first output end and second output terminal；The rectification filtering module
First output end is connect with the first end of the third capacitor, the second output terminal ground connection of the rectification filtering module；Described
The second end of three capacitors is grounded；The rectification filtering module is used for the electricity of inverter circuit described in the power input after rectifying and wave-filtering
Source input terminal；The third capacitor is used for the power input by connecting the inverter circuit to the reactance module charge and discharge
Realize energy feedback.
7. frequency-converter ageing tester as described in claim 1, which is characterized in that the frequency-converter ageing tester is also
Including the drive module being connect with the output end of the PWM control module；
The pwm signal for the PWM control module output that the drive module is used to receive amplifies, and will be after amplification
Pwm signal output give the switching tube of the corresponding inverter circuit of the pwm signal.
8. a kind of frequency converter aging testing system, which is characterized in that including frequency converter and for carrying out aging to the frequency converter
The frequency-converter ageing tester of test；The frequency converter includes inverter circuit；
The frequency-converter ageing tester is the described in any item frequency-converter ageing testers of claim 1 to 7.
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| CN201820415779.7U CN208172117U (en) | 2018-03-26 | 2018-03-26 | Frequency-converter ageing tester and system |
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| CN201820415779.7U CN208172117U (en) | 2018-03-26 | 2018-03-26 | Frequency-converter ageing tester and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596923A (en) * | 2018-12-24 | 2019-04-09 | 日立电梯（中国）有限公司 | Frequency converter bus capacitor on-line measuring device, method and frequency converter |
| CN112526333A (en) * | 2020-11-05 | 2021-03-19 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Current type aging test system and switch device aging test method |
| CN113219318A (en) * | 2020-01-17 | 2021-08-06 | 圣邦微电子（北京）股份有限公司 | Power supply circuit aging device and aging test method |
-
2018
- 2018-03-26 CN CN201820415779.7U patent/CN208172117U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596923A (en) * | 2018-12-24 | 2019-04-09 | 日立电梯（中国）有限公司 | Frequency converter bus capacitor on-line measuring device, method and frequency converter |
| CN113219318A (en) * | 2020-01-17 | 2021-08-06 | 圣邦微电子（北京）股份有限公司 | Power supply circuit aging device and aging test method |
| CN113219318B (en) * | 2020-01-17 | 2023-12-29 | 圣邦微电子（北京）股份有限公司 | Power supply circuit aging device and aging test method |
| CN112526333A (en) * | 2020-11-05 | 2021-03-19 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Current type aging test system and switch device aging test method |
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