CN112688674A - Overcurrent protection circuit of power switch tube - Google Patents
Overcurrent protection circuit of power switch tube Download PDFInfo
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- CN112688674A CN112688674A CN202011499115.1A CN202011499115A CN112688674A CN 112688674 A CN112688674 A CN 112688674A CN 202011499115 A CN202011499115 A CN 202011499115A CN 112688674 A CN112688674 A CN 112688674A
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- 101150090280 MOS1 gene Proteins 0.000 claims description 13
- 101100401568 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MIC10 gene Proteins 0.000 claims description 13
- 102100030393 G-patch domain and KOW motifs-containing protein Human genes 0.000 claims description 11
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 11
- 238000005070 sampling Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The invention discloses an overcurrent protection circuit of a power switch tube. The protection circuit collects the current of the power switch tube when the driving signal of the power switch tube reaches the Miller platform voltage of the power switch tube, converts the current into collected voltage, compares the collected voltage with a voltage risk threshold value, and generates a trigger signal to trigger and implement overcurrent protection when the collected voltage is greater than the voltage risk threshold value. Compared with the prior art that the filter capacitor is used at the input end of the comparator to relieve the sampling voltage fluctuation caused by the voltage pulse jump when the power switch tube is switched, the overcurrent protection scheme of the power switch tube provided by the invention can not only avoid the error protection in the switching process, but also realize the rapid protection after the power switch tube is completely switched on.
Description
Technical Field
The invention relates to the field of overcurrent protection of power devices, in particular to an overcurrent protection circuit of a power switch tube.
Background
Power devices such as MOSFETs and IGBTs are used in devices such as switching power supplies and motor controllers, and these devices generate high and low level pulse transitions (the high level may reach an input voltage value, and the low level is a zero voltage value) during actual operation. Compared with a signal switch tube, when the high and low levels of the power switch tube jump, the current flowing through the power device can generate overshoot, which brings trouble for designing an overcurrent protection circuit for the power devices.
The existing overcurrent protection scheme of the power device is characterized in that the current of the power device is collected and converted into voltage, the voltage is compared with a preset risk voltage value, and when the collected voltage is greater than the risk voltage value, a corresponding overcurrent protection action is triggered and implemented. The sampling voltage is inaccurate due to the current overshoot of the power switch tube when the high and low levels jump, and therefore error protection is caused. In order to solve the above technical problem, as shown in fig. 1, in the overcurrent protection trigger signal circuit of the prior art power transistor, the source of the power switch MOS1 collects the current flowing through the power switch MOS1 through the sampling resistor R1 and converts the current into a voltage signal, and the voltage signal is input to the comparator comp2 for comparison with the risk voltage value formed by the voltage division of the resistors R4 and R5. The fluctuation of the sampled voltage caused by the pulse jump of the voltage is usually alleviated by adding filter capacitors C1 and C2 at the voltage sampling terminal or the input terminal of the comparator comp 2. But due to the existence of the filter capacitor, the acquired voltage is delayed relative to the current signal actually flowing through the power device, and further delay protection is caused.
Disclosure of Invention
The over-current protection circuit aims to overcome the defect that the existing over-current protection circuit of the power device is easy to cause error protection or delay protection. The invention provides an overcurrent protection circuit of a power switch tube. When a power switch tube driving signal reaches the Miller platform voltage of the power switch tube, the protection circuit compares the current of the power switch tube with a voltage risk threshold value after converting the current into a collected voltage through a voltage collecting circuit, and when the collected voltage is larger than the voltage risk threshold value, a trigger signal is generated to trigger timely implementation of overcurrent protection.
Further, the voltage acquisition circuit includes: the comparator Comp1, the comparator Comp2, the power switch MOS1, the signal switch MOS2 and the resistors R1-R6; the drain of the power switch MOS1 is connected with the input voltage Vbus of the pulse circuit, the gate is connected with the drive signal driver1, the source is connected with the inverting input end of the comparator Comp2 through a resistor R2, and the source is grounded through a resistor R1; the inverting input end of the comparator Comp1 is connected with the miller platform voltage Vref1 of the power switch MOS1, the non-inverting input end is connected with the driving signal driver1, the output end is connected with the gate of the signal switch MOS2, and the output end is connected with the supply voltage Vdd1 through the pull-up resistor R3; the source of the signal switching tube MOS2 is grounded, and the drain is connected with the non-inverting input end of the comparator Comp2 through a resistor R5; the non-inverting input of the comparator Comp2 is connected to the constant voltage Vdd2 through a resistor R4, the output thereof outputs the trigger signal, and the output thereof is connected to the supply voltage Vdd3 through a pull-up resistor R6.
Drawings
FIG. 1 is a prior art overcurrent protection trigger signal circuit for a power switching tube;
fig. 2 is a schematic circuit diagram of a voltage acquisition circuit in the overcurrent protection circuit of the power switching tube according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages solved by the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an overcurrent protection circuit of a power switch tube. When a power switch tube driving signal reaches the Miller platform voltage of the power switch tube, the protection circuit converts the current of the power switch tube into a collected voltage through a voltage collecting circuit, compares the collected voltage with a voltage risk threshold value, and generates a trigger signal to trigger in time to implement overcurrent protection when the collected voltage is greater than the voltage risk threshold value.
As shown in fig. 2, the voltage acquisition circuit in the overcurrent protection circuit provided by the present invention includes: the comparator Comp1, the comparator Comp2, the power switch MOS1, the signal switch MOS2 and the resistors R1-R6; the drain of the power transistor MOS1 is connected with the input voltage Vbus of the pulse circuit, the gate is connected with the driving signal driver1, the source is connected with the inverting input end of the comparator Comp2 through a resistor R2, and the source is grounded through a resistor R1; the inverting input end of the comparator Comp1 is connected with the miller platform voltage Vref1 of the power switch MOS1, the non-inverting input end is connected with the driving signal driver1, the output end is connected with the gate of the signal switch MOS2, and the output end is connected with the supply voltage Vdd1 through the pull-up resistor R3; the source of the signal tube MOS2 is grounded, and the drain is connected with the non-inverting input end of the comparator Comp2 through a resistor R5; the non-inverting input of the comparator Comp2 is connected to the constant voltage Vdd2 through a resistor R4, the output thereof outputs the trigger signal, and the output thereof is connected to the supply voltage Vdd3 through a pull-up resistor R6.
When the voltage amplitude of the driving signal Driver1 is lower than the miller platform voltage Vref1 of the power transistor MOS1, the signal switching transistor MOS2 is not turned on, the resistor R5 is not grounded, the positive input voltage of the comparator Comp2 is higher than the negative input voltage, and the output of the output terminal is at a high level. When the voltage amplitude of the driving signal Driver1 is higher than the miller platform voltage Vref1 of the power switch MOS1, the signal switch MOS2 is turned on, the resistor R5 is grounded, the positive input voltage of the comparator Comp2 is lower than the negative input voltage, and the output of the output terminal output is low.
The overcurrent protection circuit of the power switch tube provided by the invention utilizes the voltage of the Miller platform of the power switch tube to control the moment of collecting the current of the power switch tube so as to generate a trigger signal to trigger and implement overcurrent protection. Compared with the prior art, the power switch tube overcurrent protection circuit can be prevented from generating error protection and delay protection.
Claims (3)
1. The overcurrent protection circuit is characterized in that when a power switch tube driving signal reaches the Miller platform voltage of the power switch tube, the protection circuit compares the current of the power switch tube with a voltage risk threshold value after converting the current into a collected voltage through a voltage collection current, and when the collected voltage is larger than the voltage risk threshold value, a trigger signal is generated to trigger in time to implement overcurrent protection.
2. The overcurrent protection circuit of claim 1, wherein said voltage acquisition circuit employs a comparator to effect a comparison of said acquired voltage to a voltage risk threshold; wherein the voltage risk threshold is connected to an input terminal of the comparator when the driving signal reaches the miller platform voltage of the power switch tube.
3. The over-current protection circuit of claim 2, wherein the voltage acquisition circuit comprises: the comparator Comp1, the comparator Comp2, the power switch MOS1, the signal switch MOS2 and the resistors R1-R6; the drain of the power transistor MOS1 is connected with the input voltage Vbus of the pulse circuit, the gate is connected with the driving signal driver1, the source is connected with the inverting input end of the comparator Comp2 through a resistor R2, and the source is grounded through a resistor R1; the inverting input end of the comparator Comp1 is connected with the miller platform voltage Vref1 of the power switch MOS1, the non-inverting input end is connected with the driving signal driver1, the output end is connected with the gate of the signal switch MOS2, and the output end is connected with the supply voltage Vdd1 through the pull-up resistor R3; the source of the signal tube MOS2 is grounded, and the drain is connected with the non-inverting input end of the comparator Comp2 through a resistor R5; the non-inverting input of the comparator Comp2 is connected to the constant voltage Vdd2 through a resistor R4, the output thereof outputs the trigger signal, and the output thereof is connected to the supply voltage Vdd3 through a pull-up resistor R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011499115.1A CN112688674A (en) | 2020-12-15 | 2020-12-15 | Overcurrent protection circuit of power switch tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011499115.1A CN112688674A (en) | 2020-12-15 | 2020-12-15 | Overcurrent protection circuit of power switch tube |
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| CN112688674A true CN112688674A (en) | 2021-04-20 |
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| CN202011499115.1A Pending CN112688674A (en) | 2020-12-15 | 2020-12-15 | Overcurrent protection circuit of power switch tube |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030180997A1 (en) * | 2002-01-17 | 2003-09-25 | Mitsubishi Denki Kabushiki Kaisha | Drive circuit for a power semiconductor device |
| JP2009225506A (en) * | 2008-03-13 | 2009-10-01 | Toshiba Corp | Power converter |
| CN204559983U (en) * | 2015-05-08 | 2015-08-12 | 杭州宽福科技有限公司 | A kind of LED drive chip |
| CN105142091A (en) * | 2010-11-22 | 2015-12-09 | 快捷半导体(苏州)有限公司 | Accessory detection system and method |
| CN108508342A (en) * | 2018-05-28 | 2018-09-07 | 中国科学院上海微系统与信息技术研究所 | A kind of IGBT short circuit overcurrents detection circuit |
| CN109756012A (en) * | 2017-11-06 | 2019-05-14 | 株式会社电装 | Over-current judging device and the driving unit for using the over-current judging device |
| CN111244883A (en) * | 2020-02-20 | 2020-06-05 | 南京航空航天大学 | SiC MOSFET short-circuit protection circuit and protection method for comprehensively comparing grid charge and voltage |
-
2020
- 2020-12-15 CN CN202011499115.1A patent/CN112688674A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030180997A1 (en) * | 2002-01-17 | 2003-09-25 | Mitsubishi Denki Kabushiki Kaisha | Drive circuit for a power semiconductor device |
| JP2009225506A (en) * | 2008-03-13 | 2009-10-01 | Toshiba Corp | Power converter |
| CN105142091A (en) * | 2010-11-22 | 2015-12-09 | 快捷半导体(苏州)有限公司 | Accessory detection system and method |
| CN204559983U (en) * | 2015-05-08 | 2015-08-12 | 杭州宽福科技有限公司 | A kind of LED drive chip |
| CN109756012A (en) * | 2017-11-06 | 2019-05-14 | 株式会社电装 | Over-current judging device and the driving unit for using the over-current judging device |
| CN108508342A (en) * | 2018-05-28 | 2018-09-07 | 中国科学院上海微系统与信息技术研究所 | A kind of IGBT short circuit overcurrents detection circuit |
| CN111244883A (en) * | 2020-02-20 | 2020-06-05 | 南京航空航天大学 | SiC MOSFET short-circuit protection circuit and protection method for comprehensively comparing grid charge and voltage |
Non-Patent Citations (6)
| Title |
|---|
| Z. WANG, X. SHI, L. M. TOLBERT, F. WANG AND B. J. BLALOCK: "A di/dt Feedback-Based Active Gate Driver for Smart Switching and Fast Overcurrent Protection of IGBT Modules", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
| Z. WANG, X. SHI, L. M. TOLBERT, F. WANG AND B. J. BLALOCK: "A di/dt Feedback-Based Active Gate Driver for Smart Switching and Fast Overcurrent Protection of IGBT Modules", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》, 15 August 2013 (2013-08-15) * |
| 李新昌等: "基于IGBT栅极米勒平台的新型电流过载检测技术", 《仪器仪表学报》 * |
| 李新昌等: "基于IGBT栅极米勒平台的新型电流过载检测技术", 《仪器仪表学报》, no. 09, 15 September 2018 (2018-09-15), pages 156 - 162 * |
| 贺长龙: "大功率IGBT通用驱动器设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 贺长龙: "大功率IGBT通用驱动器设计", 《中国优秀硕士学位论文全文数据库 信息科技辑》, 15 April 2016 (2016-04-15), pages 135 - 109 * |
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Application publication date: 20210420 |