CN203225729U - IGBT (Insulated Gate Bipolar Transistor) driving circuit with switch protection - Google Patents
IGBT (Insulated Gate Bipolar Transistor) driving circuit with switch protection Download PDFInfo
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- CN203225729U CN203225729U CN 201320232738 CN201320232738U CN203225729U CN 203225729 U CN203225729 U CN 203225729U CN 201320232738 CN201320232738 CN 201320232738 CN 201320232738 U CN201320232738 U CN 201320232738U CN 203225729 U CN203225729 U CN 203225729U
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- igbt
- driver element
- pwm driver
- driving
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Abstract
The utility model discloses an IGBT (Insulated Gate Bipolar Transistor) driving circuit with switch protection. The IGBT driving circuit comprises a PWM driving unit, wherein a driving signal control terminal of the PWM driving unit is connected with a single-chip microcomputer and an output terminal of a voltage comparison circuit, a positive input terminal of the voltage comparison circuit is configured to be a preset threshold voltage, a negative input terminal of the voltage comparison circuit is connected with a working voltage terminal VCC of the PWM driving unit, and the preset threshold voltage is lower than a normal working voltage of the PWM driving unit. According to the IGBT driving circuit provided by the utility model, a timer in the single-chip microcomputer is used for controlling the delayed start of an IGBT driving wave, so that the timing is accurate, and interference caused by frequent startup and shutdown is prevented; and when a welding machine is power off, if the IGBT driving voltage is lower than the preset threshold voltage, the IGBT driving wave is stopped intermediately by the voltage comparison circuit, thereby effectively preventing shoot-through damages of IGBTs as the driving voltage is too low.
Description
Technical field
The utility model relates to a kind of IGBT drive circuit, relates in particular to a kind of IGBT drive circuit with switch protection.
Background technology
Driving clutter when there is start in welding machine and cause IGBT((Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) the driving voltage deficiency causes the straight-through problem of damaging of IGBT when leading directly to damage and shutdown.Need rely on electric capacity to charge the delay that realizes that the IGBT drive waveforms enables when existing welding machine powers on, and when the repeat switch machine, if the electricity in the electric capacity has not been put fast, will lose this protective effect; And when welding machine cuts off the power supply, needing to rely on overvoltage/undervoltage to protect to close the IGBT drive waveforms, reaction speed is slower; Therefore, be necessary to provide a kind of IGBT drive circuit with switch protection.
The utility model content
Technical problem to be solved in the utility model provides a kind of IGBT drive circuit with switch protection, and the driving voltage deficiency caused the problem of the straight-through damage of IGBT when the driving clutter caused the straight-through damage of IGBT and shutdown in the time of can effectively solving start.
The utility model is to solve the problems of the technologies described above the technical scheme that adopts to provide a kind of IGBT drive circuit with switch protection; comprise the PWM driver element; wherein; the driving signal controlling end of described PWM driver element and the output of single-chip microcomputer and voltage comparator circuit link to each other; the electrode input end of described voltage comparator circuit is set to pre-set threshold value voltage; the operating voltage end VCC of negative input and PWM driver element links to each other, and described pre-set threshold value voltage is less than the normal working voltage of PWM driver element.
The above-mentioned IGBT drive circuit with switch protection wherein, is provided with timer in the described single-chip microcomputer, and described PWM driver element receives the unlatching of the time delayed signal control PWM driver element of self-timer.
The above-mentioned IGBT drive circuit with switch protection; wherein; the normal working voltage of described PWM driver element is 18V, and described pre-set threshold value voltage is 15V, and described PWM driver element receives closing from the output signal control PWM driver element of voltage comparator circuit.
The above-mentioned IGBT drive circuit with switch protection, wherein, described PWM driver element is the UC3846 chip.
The utility model contrast prior art has following beneficial effect: the IGBT drive circuit with switch protection that the utility model provides, control the delayed start-up of IGBT drive waveforms by the timer in the use single-chip microcomputer, not only the time goes up accurately, and is not subjected to the interference of frequent switching on and shutting down; When closing welding machine electric power, when the IGBT driving voltage is lower than pre-set threshold value voltage, then use voltage comparator circuit to close the IGBT drive waveforms immediately, thereby effectively avoid straight-through damage the because of the low excessively IGBT that causes of driving voltage.
Description of drawings
Fig. 1 is the IGBT driving circuit structure schematic diagram that the utlity model has switch protection.
Among the figure:
1 PWM driver element, 2 single-chip microcomputers, 3 voltage comparator circuits
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
Fig. 1 is the IGBT driving circuit structure schematic diagram that the utlity model has switch protection.
See also Fig. 1; the IGBT drive circuit with switch protection that the utility model provides comprises PWM driver element 1; wherein; the driving signal controlling end of described PWM driver element 1 links to each other with the output of single-chip microcomputer 2 and voltage comparator circuit 3; the electrode input end of described voltage comparator circuit 3 is set to pre-set threshold value voltage; the operating voltage end VCC of negative input and PWM driver element 1 links to each other, and described pre-set threshold value voltage is less than the normal working voltage of PWM driver element 1.
The IGBT drive circuit with switch protection that the utility model provides, IGBT driving signal was closed when welding machine powered on, and needed enable IGBT driving signal by single-chip microcomputer 2 behind the time-delay certain hour.Be provided with timer in the described single-chip microcomputer 2, after welding machine powers on, the internal counter of single-chip microcomputer 2 is started working, and reaches certain time-delay and exports IGBT after the time and enable to drive signal, and described PWM driver element 1 receives the unlatching of the time delayed signal control PWM driver element 1 of self-timer.
The above-mentioned IGBT drive circuit with switch protection, wherein, described PWM driver element 1 can be selected the UC3846 chip of FAIRCHILD company design for use, and output is DRIVERA and DRIVERB.The normal working voltage of described PWM driver element 1 is 18V, and described pre-set threshold value voltage preferably is made as 15V.After the welding machine outage, the operating voltage of UC3846 (+18V) begin to descend, when drop to+when 15V was following, described PWM driver element 1 receives closed PWM driver element 1 immediately from the output signal of voltage comparator circuit 3.
In sum, the IGBT drive circuit with switch protection that the utility model provides is controlled the delayed start-up of IGBT drive waveforms by using single-chip microcomputer 2 interior timers, and not only the time goes up accurately, and is not subjected to the interference of frequent switching on and shutting down.When closing welding machine electric power, then use voltage comparator circuit 3, when IGBT driving voltage (UC3846 operating voltage) when being lower than pre-set threshold value voltage, close the IGBT drive waveforms immediately, thereby effectively avoid straight-through damage the because of the low excessively IGBT that causes of driving voltage.
Though the utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection range of the present utility model is worked as with being as the criterion that claims were defined.
Claims (4)
1. IGBT drive circuit with switch protection; comprise PWM driver element (1); it is characterized in that; the driving signal controlling end of described PWM driver element (1) links to each other with the output of single-chip microcomputer (2) and voltage comparator circuit (3); the electrode input end of described voltage comparator circuit (3) is set to pre-set threshold value voltage; the operating voltage end VCC of negative input and PWM driver element (1) links to each other, and described pre-set threshold value voltage is less than the normal working voltage of PWM driver element (1).
2. the IGBT drive circuit with switch protection as claimed in claim 1 is characterized in that, described single-chip microcomputer is provided with timer in (2), and described PWM driver element (1) receives the unlatching of the time delayed signal control PWM driver element (1) of self-timer.
3. the IGBT drive circuit with switch protection as claimed in claim 1; it is characterized in that; the normal working voltage of described PWM driver element (1) is 18V; described pre-set threshold value voltage is 15V, and described PWM driver element (1) receives closing from output signal control PWM driver element (1) of voltage comparator circuit (3).
4. as each described IGBT drive circuit with switch protection of claim 1～3, it is characterized in that described PWM driver element (1) is the UC3846 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320232738 CN203225729U (en) | 2013-04-28 | 2013-04-28 | IGBT (Insulated Gate Bipolar Transistor) driving circuit with switch protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320232738 CN203225729U (en) | 2013-04-28 | 2013-04-28 | IGBT (Insulated Gate Bipolar Transistor) driving circuit with switch protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203225729U true CN203225729U (en) | 2013-10-02 |
Family
ID=49252719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320232738 Expired - Fee Related CN203225729U (en) | 2013-04-28 | 2013-04-28 | IGBT (Insulated Gate Bipolar Transistor) driving circuit with switch protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203225729U (en) |
-
2013
- 2013-04-28 CN CN 201320232738 patent/CN203225729U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131002 Termination date: 20200428 |