CN208060661U - Elevator frequency converter IGBT junction temperature on-line measuring devices - Google Patents
Elevator frequency converter IGBT junction temperature on-line measuring devices Download PDFInfo
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Abstract
This application involves a kind of elevator frequency converter IGBT junction temperature on-line measuring devices.Described device includes：Circuit occurs for the micro-current being connect with IGBT circuits, for applying constant current to IGBT circuits before elevator starts operation；The detection circuit being connect with the IGBT circuits, for measuring the saturation voltage drop after the IGBT circuits apply the constant current；The controller being connect with the detection circuit, for determining that elevator starts preceding junction temperature according to the saturation voltage drop.The device can directly measure the saturation voltage drop of IGBT by detection circuit, and the junction temperature of determining elevator IGBT is removed further according to saturation pressure, the method for going estimation junction temperature by measuring the shell temperature of IGBT instead of tradition.Realize the junction temperature value that accurate on-line measurement goes out IGBT.
Description
Technical field
This application involves frequency converter temperature detection technical fields, online more particularly to a kind of elevator frequency converter IGBT junction temperatures
Detection device.
Background technology
With the development of ac-dc conversion technology, frequency converter is widely applied.Also, skyscraper such as rain in recent years
Occur as spring bamboo afterwards in people's lives so that elevator is also applied more and more extensive.Due in order to ensure the comfort of elevator, electricity
Ladder is mostly used frequency converter regulation and control speed and is run and loaded with non-constant velocities and is not fixed, so the power module IGBT of frequency converter
The power of (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) can ceaselessly change, and
Power module IGBT can have loss in use, cause the junction temperature of IGBT can be higher and higher, when junction temperature is more than limit value
IGBT will be damaged.
The method of the common detection elevator frequency converter IGBT junction temperatures of tradition is that temperature sensing is placed between IGBT and radiator
Device detects the shell temperature of IGBT, by the junction temperature value of the situation of change of IGBT shell temperature estimation IGBT, that is, traditional detection method without
Method direct-on-line measures the junction temperature value of IGBT, causes to detect IGBT junction temperature value inaccuracy.
Invention content
Based on this, it is necessary in view of the above technical problems, provide a kind of elevator that can accurately measure IGBT junction temperatures online
Frequency converter IGBT detection devices.
A kind of elevator frequency converter IGBT junction temperature on-line measuring devices, including：
It is connect with IGBT circuits, circuit occurs to the micro-current of IGBT output constant currents；
The detection for the saturation voltage drop that the IGBT circuits input after the constant current is connect, measured with the IGBT circuits
Circuit；
The controller being connect with the detection circuit, for determining junction temperature value according to the saturation voltage drop；
The IGBT circuits are isolated and the isolation circuit of circuit occurs for the detection circuit, micro-current.
In one of the embodiments, the micro-current occur circuit include input terminal connect with power supply, output end and institute
State the constant-current source of IGBT circuits connection.
The detection circuit includes the first subtracter and the second subtracter in one of the embodiments,；
Output end, the reverse input end of the noninverting input connection constant-current source of first subtracter connect the IGBT electricity
Road, output end connect the reverse input end of second subtracter；Described in the noninverting input connection of second subtracter
IGBT circuits, output end connect the controller.
The detection circuit further includes the first follower and the second follower in one of the embodiments,；
The in-phase input end of first follower connects the output end of the constant-current source；The reverse phase of first follower
Input terminal connects the output end of first follower；The output end of first follower connects the same of first subtracter
To input terminal；The inverting input of second follower connects the output end of second follower；Second follower
Output end connect the noninverting input and reverse input end of the reversed input terminal of first subtracter, the second subtracter.
The isolation circuit includes the first diode and the second diode in one of the embodiments,；
The anode of first diode connects the output end of the constant-current source；The cathode of first diode connects institute
State the in-phase input end of the second follower；The anode of second diode connects the in-phase input end of second follower；
The anode of second diode connects the IGBT circuits.
Described device further includes the contactor being connect with IGBT circuits in one of the embodiments,.
First subtracter includes the first operational amplifier, first resistor, the second electricity in one of the embodiments,
Resistance, 3rd resistor and the 4th resistance；
The first end of the first resistor connects the output end of the first follower, and second end connects the first operational amplifier
In-phase input end；The in-phase input end of the second end and the first operational amplifier of the first end connection first resistor of second resistance,
Second end is grounded；3rd resistor first end connects the output end of the second follower, and second end connects the anti-of the first operational amplifier
Phase input terminal；The inverting input of the second end and the first operational amplifier of the first end connection 3rd resistor of 4th resistance, the
Two ends connect the output end of the first operational amplifier.
Second subtracter includes second operational amplifier, the 5th resistance, the 6th electricity in one of the embodiments,
Resistance, the 7th resistance and the 8th resistance；
The first end of 5th resistance connects the first end of the output end and 3rd resistor of the second follower, and second end connects
Connect the in-phase input end of second operational amplifier；The first end of 6th resistance connects second end and the second operation of the 5th resistance R5
The in-phase input end of amplifier, second end ground connection；The first end of 7th resistance connects second end and the first operation of the 4th resistance
The output end of amplifier, second end connect the inverting input of second operational amplifier；The first end connection the 7th of 8th resistance
The second end of resistance and the inverting input of second operational amplifier, second end connect the output end of second operational amplifier.
The detection circuit further includes linear optical coupling in one of the embodiments,.
The IGBT circuits include driving circuit in one of the embodiments,.
Above-mentioned elevator frequency converter IGBT detection devices occur circuit by micro-current and apply constant current, detection to IGBT
Saturation voltage drop after circuit measuring IGBT circuits application constant current is sent to controller, and controller determines electricity according to saturation voltage drop
The junction temperature of ladder before activation.Above-mentioned apparatus and method can directly measure the saturation voltage drop of IGBT by detection circuit, further according to
Saturation pressure removes the junction temperature of determining elevator, and the method for going estimation junction temperature by measuring the shell temperature of IGBT instead of tradition realizes
Can accurate on-line checking go out the junction temperature value of IGBT.
Description of the drawings
Fig. 1 is the structural schematic diagram of elevator frequency converter IGBT junction temperature on-line measuring devices in one embodiment；
Fig. 2 is the circuit diagram of elevator frequency converter IGBT junction temperature on-line measuring devices in one embodiment；
Fig. 3 is the circuit diagram of elevator frequency converter IGBT junction temperature on-line measuring devices in another embodiment.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the object, technical solution and advantage of the application be more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
In one embodiment, as shown in Figure 1, providing a kind of elevator frequency converter IGBT (Insulated Gate
Bipolar Transistor, insulated gate bipolar transistor) junction temperature on-line measuring device 100, which includes and IGBT is electric
The micro-current of road connection occurs circuit 200, the detection circuit 300 that is connect with IGBT circuits and is connect with detection circuit 300
Controller 400.IGBT junction temperatures on-line measuring device 100 further includes isolation circuit 500, and IGBT circuits are connected by isolation circuit 500
It connects detection circuit 300 and circuit 200 occurs for micro-current.Specifically, circuit 200 occurs for micro-current, for applying to IGBT circuits
Constant current.Detection circuit 300 is used to measure IGBT circuits and applies the saturation voltage drop after constant current.Controller 400 is used for root
Junction temperature value is determined according to the saturation voltage drop that detection circuit measures.
Isolation circuit 500 is used to occur micro-current the height of circuit 200 and detection circuit 300 and the IGBT circuits of frequency converter
Pressure and high current are environmentally isolated out.Due to the presence of isolation circuit 500, which can transport always
Row ensures the normal operation of frequency converter without shutdown.
The compound full-control type voltage that IGBT is made of BJT (double pole triode) and MOS (insulating gate type field effect tube)
Drive-type power semiconductor has advantage of both the high input impedance of MOSFET and the low conduction voltage drop of GTR concurrently.Due to
IGBT combines the advantages of both the above device, and driving power is small and saturation pressure reduces.Therefore being highly suitable for DC voltage is
Converter system of 600v or more, such as alternating current generator, frequency converter etc..
Existing elevator mostly uses frequency converter and carries out speed regulating control, but since elevator operation is with non-constant velocities and electricity
Terraced load weight is not fixed, and power converter output is caused constantly to change.IGBT is being connected as the power module of frequency converter
State or open-off state can all have certain consume so that the junction temperature of IGBT can be higher and higher.But IGBT junction temperatures
There is the limitation of maximum temperature, if junction temperature is more than limitation, IGBT will be damaged easily.Therefore in order to ensure frequency converter long-term safety
Reliable operation, needs the junction temperature to frequency converter IGBT to be detected.Tradition places temperature usually between IGBT and radiator
Sensor estimates junction temperature value by the shell temperature of temperature sensor measurement IGBT, can not directly and accurately measure junction temperature.
However, above-mentioned elevator frequency converter IGBT junction temperature measurement devices, for increasing micro-current on the basis of IGBT circuits
Circuit 200 and detection circuit 300 occurs.Circuit 200 occurs by micro-current and applies constant electric current to IGBT circuits, then by examining
The detection of slowdown monitoring circuit 300 applies the saturation voltage drop of the IGBT after constant current, is closed according to the function between saturation voltage drop and junction temperature value
System obtains the junction temperature value of elevator.Above-mentioned apparatus has banned the method that tradition estimates junction temperature by measuring IGBT shell temperature, and realizing can
With the accurate junction temperature for measuring acquisition IGBT online.
In one embodiment, as shown in Fig. 2, being the circuit diagram of elevator frequency converter IGBT junction temperature on-line measuring devices.Its
In, it includes that input terminal connects with power supply VCC that circuit 200, which occurs, for the micro-current in elevator frequency converter IGBT junction temperature on-line measuring devices
It connects, the constant-current source I of output end and IGBT circuits connection.Power supply VCC is the driving power in IGBT circuits, for being supplied for constant-current source
Electricity provides Current Voltage, and constant-current source I is used to ensure that the electric current that power supply VCC is provided to be in steady state.
In one embodiment, the detection circuit 300 in elevator frequency converter IGBT junction temperatures on-line measuring device includes first
Subtracter 310 and the second subtracter 320.
Specifically, output end, the reverse input end of the noninverting input connection constant-current source of the first subtracter 310 connect IGBT
Circuit, output end connect the reverse input end of the second subtracter 320；The noninverting input connection IGBT electricity of second subtracter 320
Road, output end connect controller 400.
In another embodiment, detection circuit 300 further includes the first follower U3 and the second follower U4.Wherein, with
It is used for increasing impedance with device, plays buffering isolation in circuit.
Specifically, the output end of the in-phase input end connection constant-current source I of the first follower U3；The reverse phase of first follower U3
Input terminal connects the output end of the first follower U3；The output end of first follower U3 connects the in the same direction defeated of the first subtracter 310
Enter end；The inverting input of second follower U4 connects the output end of the second follower U4；The output end of second follower U4 connects
Connect the reverse input end of the first subtracter 310, the noninverting input and reverse input end of the second subtracter 320.
In one embodiment, as shown in figure 3, being the circuit of another elevator frequency converter IGBT junction temperature on-line measuring devices
Figure.Wherein, 310 and second subtracter 320 of the first subtracter shown in Fig. 2 is built by operational amplifier and resistance,
The quantity of operational amplifier and resistance can be set according to practical situations when building subtracter using operational amplifier and resistance.
In the present embodiment, a preferably operational amplifier and four resistance.
Specifically, the first subtracter 310 includes the first operational amplifier U1, first resistor R1, second resistance R2, third electricity
Hinder R3 and the 4th resistance R4.Second subtracter 320 includes second operational amplifier U2, the 5th resistance R5, the 6th resistance R6, the 7th
Resistance R7 and the 8th resistance R8.The reverse phase of the inverting input connection second operational amplifier U2 of first operational amplifier U1 is defeated
Enter end.
The first end of first resistor R1 connects the output end of the first follower U3, and second end connects the first operational amplifier U1
In-phase input end.The same phase of the second end and the first operational amplifier U1 of the first end connection first resistor R1 of second resistance R2
Input terminal, second end ground connection.3rd resistor R3 first ends connect the output end of the second follower U4, and second end connects the first operation
The inverting input of amplifier U1.The second end and the first operational amplifier U1 of the first end connection 3rd resistor of 4th resistance
Inverting input, second end connect the inverting input of the output end and second operational amplifier U2 of the first operational amplifier U1.
The first end of 5th resistance R5 connects the first end of the output end and 3rd resistor R3 of the second follower U4, second end connection second
The in-phase input end of operational amplifier U2.The first end of 6th resistance R6 connects the second end of the 5th resistance R5 and the second operation is put
The in-phase input end of big device U2, second end ground connection.The first end of 7th resistance R7 connects the second end and first of the 4th resistance R4
The output end of operational amplifier U1, second end connect the inverting input of second operational amplifier U2.The first of 8th resistance R8
The inverting input of the second end and second operational amplifier U2 of the 7th resistance R7 of end connection, second end connect the second operation amplifier
The output end of device U2.
In one embodiment, detection circuit 300 further includes linear optical coupling U5.Wherein, linear optical coupling is a kind of for mould
The optocoupler of quasi- signal isolation, can be isolated electric current, protect and be tested object and test circuit, reduce environmental disturbances to test
The influence of circuit.
Specifically, the output end of the input terminal connection second operational amplifier U2 of linear optical coupling U5, linear optical coupling U5's is defeated
Outlet connects controller 400.In the present embodiment, the saturation voltage drop measured cannot be directly output to controller, in order to reduce
Interfere and play buffer action.The saturation voltage drop measured is passed through linear optical coupling U5 by the second operational amplifier U2 of detection circuit
It exports to controller.
In one embodiment, isolation circuit 500 includes the first diode D1 and the second diode D2.First diode D1
Anode connection constant-current source I output end；The cathode of first diode D1 connects the in-phase input end of the second follower U4；Second
The in-phase input end of the second follower U4 of anode connection of diode D2；The anode connection IGBT circuits of second diode D2.
Specifically, when saturation voltage drop due to measuring IGBT circuits in detection circuit 300, while isolation circuit can also be measured
The pressure drop of diode in 500.Also, because the pressure drop of different temperatures and the diode under different electric currents can be different, in order to
Diode drop is avoided to the influence of detection circuit 300, improves the accuracy of detection circuit, it is identical using two in the present embodiment
The Diode series of model constitute isolation circuit 500.If of less demanding to the accuracy of detection circuit 300 according to actual conditions
It can also be only with a diode.If also, isolation circuit 500 is only with a diode, the subtraction in detection circuit 300
Device can remove, and only use a follower.
In one embodiment, described device further includes the 10T contactors 600 being connect with IGBT circuits.
Specifically, in the present embodiment, the motor that frequency converter is driven belongs to inductive load, therefore in emergent stopping frequency conversion
When device, flowing through the electric current of IGBT will not stop immediately.Therefore increase 10T contactors to may be implemented quickly to break the electricity for flowing through IGBT
Stream.
In one embodiment, before elevator starts operation, I pairs of power supply VCC and constant-current source in circuit 200 occur for micro-current
After IGBT circuits apply constant electric current, the first subtracter 310 in detection circuit 300 passes through the first follower U3 outputs first
The pressure drop V of diode D1D1.The saturation voltage drop V that the output valve of second subtracter 320 is the IGBT detectedCEWith the second diode
The pressure drop V of D2D2Sum subtracts the pressure drop V of the first diode D1 againD1, i.e. the output valve of the second subtracter U2 is VCE+VD2-
VD1。
Since the first diode D1 and the second diode D2 are identical two diodes of model, and residing temperature and institute
The electric current of conducting is essentially identical, therefore, VD2≈VD1.So the output valve of the second subtracter 320 is VCE+VD2-VD1≈VCE, VCE?
It is exactly the saturation voltage drop that detection circuit 300 measures.
In one embodiment, controller 400 is additionally operable to obtain the load value of elevator and elevator starts preceding junction temperature.According to negative
Load value determines the variations injunction temperature value of tested point.The junction temperature of tested point is obtained according to junction temperature before startup and the variations injunction temperature value of tested point
Value.
In one embodiment, IGBT circuits include driving circuit and IGBT.Driving circuit connects IGBT.
In one embodiment, driving circuit includes power supply, capacitance and resistance.
Above-mentioned elevator frequency converter IGBT detection devices occur circuit by micro-current and apply constant current, detection to IGBT
Saturation voltage drop after circuit measuring IGBT circuits application constant current is sent to controller, and controller determines electricity according to saturation voltage drop
The junction temperature of ladder.Above-mentioned apparatus can measure the saturation voltage drop of IGBT by detection circuit direct-on-line, be removed further according to saturation pressure
The junction temperature for determining elevator, the method for going estimation junction temperature by measuring the shell temperature of IGBT instead of tradition, realizing can be online accurate
Really measure the junction temperature value of IGBT.
Above-mentioned elevator frequency converter IGBT detection devices occur circuit by micro-current and apply constant current, detection to IGBT
Saturation voltage drop after circuit measuring IGBT circuits application constant current is sent to controller, and controller determines electricity according to saturation voltage drop
The junction temperature of ladder.Above-mentioned apparatus can measure the saturation voltage drop of IGBT by detection circuit direct-on-line, be removed further according to saturation pressure
The junction temperature for determining elevator, the method for going estimation junction temperature by measuring the shell temperature of IGBT instead of tradition, realizing can be online accurate
Really measure the junction temperature value of IGBT.
Each technical characteristic of above example can be combined arbitrarily, to keep description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield is all considered to be the range of this specification record.
The several embodiments of the application above described embodiment only expresses, the description thereof 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 coming for those of ordinary skill in the art
It says, under the premise of not departing from the application design, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the protection domain of the application patent should be determined by the appended claims.
Claims (10)
1. a kind of elevator frequency converter IGBT junction temperature on-line measuring devices, including：
It is connect with IGBT circuits, circuit occurs to the micro-current of the IGBT circuit outputs constant current；
It connect with the IGBT circuits, measure the detection electricity that the IGBT circuits input the saturation voltage drop after the constant current
Road；
The controller being connect with the detection circuit, for determining junction temperature value according to the saturation voltage drop；
The IGBT circuits are isolated and the isolation circuit of circuit occurs for the detection circuit, micro-current.
2. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 1, which is characterized in that the micro-current
It includes the constant-current source that input terminal is connect with power supply, output end is connect with the IGBT circuits that circuit, which occurs,.
3. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 1, which is characterized in that the detection electricity
Road includes the first subtracter and the second subtracter；
The noninverting input of first subtracter connects the output end of constant-current source, reverse input end connects the IGBT circuits,
Output end connects the reverse input end of second subtracter；
The noninverting input of second subtracter connects the IGBT circuits, output end connects the controller.
4. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 3, which is characterized in that the detection electricity
Road further includes the first follower and the second follower；
The in-phase input end of first follower connects the output end of the constant-current source；The anti-phase input of first follower
End connects the output end of first follower；The output end of first follower connects the in the same direction defeated of first subtracter
Enter end；The inverting input of second follower connects the output end of second follower；Second follower it is defeated
Outlet connects the noninverting input and reverse input end of the reverse input end of first subtracter, the second subtracter.
5. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 4, which is characterized in that the isolation electricity
Road includes the first diode and the second diode；
The anode of first diode connects the output end of the constant-current source；The cathode connection described the of first diode
The in-phase input end of two followers；The anode of second diode connects the in-phase input end of second follower；It is described
The anode of second diode connects the IGBT circuits.
6. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 1, which is characterized in that described device is also
It include the contactor being connect with IGBT circuits.
7. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 1, which is characterized in that the detection electricity
Road further includes linear optical coupling.
8. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 3, which is characterized in that described first subtracts
Musical instruments used in a Buddhist or Taoist mass includes the first operational amplifier, first resistor, second resistance, 3rd resistor and the 4th resistance；
The first end of the first resistor connects the output end of the first follower, and second end connects the same phase of the first operational amplifier
Input terminal；The in-phase input end of the second end and the first operational amplifier of the first end connection first resistor of second resistance, second
End ground connection；3rd resistor first end connects the output end of the second follower, and the reverse phase that second end connects the first operational amplifier is defeated
Enter end；The inverting input of the second end and the first operational amplifier of the first end connection 3rd resistor of 4th resistance, second end
Connect the output end of the first operational amplifier.
9. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 3, which is characterized in that described second subtracts
Musical instruments used in a Buddhist or Taoist mass includes second operational amplifier, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance；
The first end of 5th resistance connects the first end of the output end and 3rd resistor of the second follower, second end connection the
The in-phase input end of two operational amplifiers；The first end of 6th resistance connects the second end and the second operation amplifier of the 5th resistance R5
The in-phase input end of device, second end ground connection；The first end of 7th resistance connects the second end and the first operation amplifier of the 4th resistance
The output end of device, second end connect the inverting input of second operational amplifier；The first end of 8th resistance connects the 7th resistance
Second end and second operational amplifier inverting input, second end connect second operational amplifier output end.
10. elevator frequency converter IGBT junction temperature on-line measuring devices according to claim 1, which is characterized in that the IGBT
Circuit includes driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820443367.4U CN208060661U (en) | 2018-03-29 | 2018-03-29 | Elevator frequency converter IGBT junction temperature on-line measuring devices |
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| CN201820443367.4U CN208060661U (en) | 2018-03-29 | 2018-03-29 | Elevator frequency converter IGBT junction temperature on-line measuring devices |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375723A (en) * | 2018-03-29 | 2018-08-07 | 日立电梯（中国）有限公司 | Elevator frequency converter IGBT junction temperatures on-line measuring device and method |
| CN109633405A (en) * | 2019-01-28 | 2019-04-16 | 山西大学 | A kind of junction temperature calibration and radiating subassembly capability evaluating device based on bias current precompensation |
| CN116008768A (en) * | 2023-03-24 | 2023-04-25 | 杭州飞仕得科技股份有限公司 | Conduction voltage drop test circuit and junction temperature tester |
-
2018
- 2018-03-29 CN CN201820443367.4U patent/CN208060661U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375723A (en) * | 2018-03-29 | 2018-08-07 | 日立电梯（中国）有限公司 | Elevator frequency converter IGBT junction temperatures on-line measuring device and method |
| CN108375723B (en) * | 2018-03-29 | 2024-07-09 | 日立电梯（中国）有限公司 | On-line detection device and method for IGBT junction temperature of elevator frequency converter |
| CN109633405A (en) * | 2019-01-28 | 2019-04-16 | 山西大学 | A kind of junction temperature calibration and radiating subassembly capability evaluating device based on bias current precompensation |
| CN109633405B (en) * | 2019-01-28 | 2020-11-10 | 山西大学 | Junction temperature calibration and heat dissipation assembly performance evaluation device based on bias current precompensation |
| CN116008768A (en) * | 2023-03-24 | 2023-04-25 | 杭州飞仕得科技股份有限公司 | Conduction voltage drop test circuit and junction temperature tester |
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