CN107769529B - Soft-off circuit of power device - Google Patents
Soft-off circuit of power device Download PDFInfo
- Publication number
- CN107769529B CN107769529B CN201711147168.5A CN201711147168A CN107769529B CN 107769529 B CN107769529 B CN 107769529B CN 201711147168 A CN201711147168 A CN 201711147168A CN 107769529 B CN107769529 B CN 107769529B
- Authority
- CN
- China
- Prior art keywords
- power device
- resistor
- voltage
- turn
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Power Conversion In General (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a soft-off circuit of a power device, which comprises a Load electronic element Load, input voltage and lead wire inductance which are in the same series circuit with the power device, wherein the power device is respectively connected with the bearing voltage, the driving voltage and the gate electrode capacitance of the power device; the power device is connected with a circuit of the driving voltage in series and is provided with a driving circuit. According to the invention, the turn-off process is processed in a segmented manner, the turn-off speed is increased at the stages of t 1-t 2 and t 2-t 3, and the turn-off speed is reduced at the stages of t 3-t 4. Accelerating the period from t2 to t3 and reducing the loss in the turn-off period; and slowing down the period from t3 to t4, and reducing the induced voltage caused by turn-off. The total turn-off time and the total turn-off loss are balanced, so that the voltage borne by the power device is reduced, and the loss and the heat generation of the power device are reduced.
Description
Technical Field
The invention relates to the field of electrical circuits, in particular to a soft-off circuit of a power device.
Background
With the rapid development of society, especially the continuous progress of science and technology, the popularization of electric power makes people's life inseparable with the electric energy. The popularization of electricity, the design of clothes, eating, living and working of people; with the increasing expansion of power generating sets, various large electric machines are increasing, wherein a power device is a very common large power device in many electric machines and circuits.
The power devices are connected in the circuit through leads, and inductors Lk exist in the leads; in the turn-off process of the power device, the current can generate sudden change, and the sudden change current can excite an induction voltage on the lead inductor LkExcited induced voltage
Will be added to the input voltage Vin to form a voltage out of the design range
Damaging the power device, as shown in fig. 1; in order to overcome the defects limited in the technology, in the prior art, the turn-off time of a power device is prolonged by increasing the driving resistance of the power device, so that the amplitude of the induction voltage is reduced; the specific principle is that the turn-off speed of the power device is in direct proportion to the driving current, and the driving current is in inverse proportion to the driving resistance, which shows that the turn-off speed of the power device is in inverse proportion to the driving resistance, so that the increase of the driving resistance can slow down the turn-off speed of the power device and prolong the turn-off time; according to the expression of the induced voltage
It is known that dt increases at constant di
And the amplitude of the induction voltage is reduced.
As shown in fig. 2, by subdividing the turn-off of the power devices, three phases can be divided: t 1-t 2, t 2-t 3 and t 3-t 4, the prior art can prolong the three stages at the same time, so that the loss of the whole turn-off process is increased, the temperature of a power device is increased, and the performance and safety of the power device are influenced.
Therefore, it is a problem worth studying if the existing circuit is improved so as to prolong the turn-off time and reduce the amplitude of the induced voltage without increasing the loss of the turn-off process of the power device.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the power device soft-off circuit which can keep the time of the stages t 1-t 2 and t 2-t 3 unchanged, prolong the time of t 3-t 4, prolong the turn-off time, reduce the amplitude of induced voltage and avoid increasing the loss of the power device in the turn-off process.
The purpose of the invention is realized as follows:
the soft-switching circuit of the power device comprises a Load, an input voltage Vin and a lead inductor L which are in the same series circuit with the power device S1kThe power device S1 is respectively connected with the power device bearing voltage U1, the driving voltage U2 and the gate capacitance Cgs of the power device; a driving circuit is arranged on a circuit of the power device S1 in series connection with the driving voltage U2;
the driving circuit comprises an on driving circuit when the power device is switched on and an off driving circuit when the power device is switched off, which are arranged in parallel;
the turn-on driving circuit comprises a first diode D1 and a first resistor R1 which are connected in series; the turn-off driving circuit comprises a second diode D2 and a second resistor R2 which are connected in series;
a power device in the first soft-off circuit is connected with a comparator COM1 through a sampling voltage b of a bearing voltage U1, and the comparator COM1 is simultaneously connected with a reference voltage a; a first control switch Q1 and a third resistor R3 are connected in series in a circuit of the comparator COM1 and the power device S1;
a third resistor R3, a first control switch Q1, a sixth resistor R6, a fifth resistor R5, a fourth resistor R4 and a first voltage regulator tube Z1 are sequentially connected in series with a circuit of a power device S1 in the second soft switching circuit;
a second control switch Q2 is arranged between the fifth resistor R5 and the sixth electronic resistor R6;
and a second voltage regulator tube Z2 is arranged between the fifth resistor R5 and the second control switch Q2.
Has the positive and beneficial effects that: according to the invention, the turn-off process is processed in a segmented manner, the turn-off speed is increased at the stages of t 1-t 2 and t 2-t 3, and the turn-off speed is reduced at the stages of t 3-t 4. Accelerating the period from t2 to t3 and reducing the loss in the turn-off period; and slowing down the period from t3 to t4, and reducing the induced voltage caused by turn-off. The total turn-off time and the total turn-off loss are balanced, so that the voltage borne by the power device is reduced, and the loss and the heat generation of the power device are reduced.
Drawings
FIG. 1 is a schematic diagram of a circuit in which a power device is located;
FIG. 2 is a prior art voltage-current waveform illustrating a turn-off process;
FIG. 3 is a first soft-off circuit of the power device according to the present invention;
FIG. 4 is a voltage current waveform diagram for the turn-off process of FIG. 3;
FIG. 5 is a second soft-off circuit of the power device according to the present invention;
fig. 6 is a voltage current waveform diagram for the turn-off process of fig. 5.
Detailed Description
The invention is further described with reference to the following drawings and specific embodiments:
the soft-switching circuit of the power device comprises a Load, an input voltage Vin and a lead inductor L which are in the same series circuit with the power device S1kThe power device S1 is respectively connected with the power device to bear the voltage U1,The drive voltage U2 and the gate capacitance Cgs of the power device; a driving circuit is arranged on a circuit of the power device S1 in series connection with the driving voltage U2;
the driving circuit comprises an on driving circuit when the power device is switched on and an off driving circuit when the power device is switched off, which are arranged in parallel;
the turn-on driving circuit comprises a first diode D1 and a first resistor R1 which are connected in series; the turn-off driving circuit comprises a second diode D2 and a second resistor R2 which are connected in series;
a power device in the first soft-off circuit is connected with a comparator COM1 through a sampling voltage b of a bearing voltage U1, and the comparator COM1 is simultaneously connected with a reference voltage a; a first control switch Q1 and a third resistor R3 are connected in series in a circuit of the comparator COM1 and the power device S1;
a third resistor R3, a first control switch Q1, a sixth resistor R6, a fifth resistor R5, a fourth resistor R4 and a first voltage regulator tube Z1 are sequentially connected in series with a circuit of a power device S1 in the second soft switching circuit;
a second control switch Q2 is arranged between the fifth resistor R5 and the sixth electronic resistor R6;
and a second voltage regulator tube Z2 is arranged between the fifth resistor R5 and the second control switch Q2.
Example 1
As shown in fig. 3 and 4, the circuit description: vin is the circuit input voltage, Lk is the line inductance, S1 is the power device, Cgs is the gate capacitance of the power device, the gate capacitance voltage determines the on and off of the power device, the first diode D1 and the second resistor R1 are the driving circuits when the power device is on, the second diode D2 and the second resistor R2 are the driving circuits when the power device is off, the third resistor R3 is the parallel resistor when the power device is off, and the first control switch Q1 is the switch for controlling the parallel connection of the resistors.
Stage t 1-t 2: because the reference voltage a is larger than the sampling voltage b, the first control switch Q1 is in an on state, and at this time, the second resistor R2 and the third resistor R3 are in a parallel state, and because the value of the third resistor R3 is smaller, the driving resistance after the second resistor R2 and the third resistor R3 are connected in parallel is small, the driving current is large, the discharge to the gate electrode capacitor Cgs of the power device is fast, and at this time, the turn-off speed of the power device is fast.
Stage t 2-t 3: in the stage, the sampling voltage rises along with the rise of the voltage borne by the power device, but the reference voltage a is larger than the sampling voltage b, so that the first control switch Q1 is kept in an on state, the second resistor R2 and the third resistor R3 are kept in parallel, and the turn-off speed of the power device is high.
Stage t 3-t 4: at the time of t3, the sampling voltage rises to exceed the reference voltage, at this time, the sampling voltage b is greater than the reference voltage a, the first control switch Q1 is in an off state, the third resistor R3 is no longer connected in parallel with the second resistor R2, the off driving resistor is only the second resistor R2, and since the value of the second resistor R2 is large, the driving current is reduced, the discharge to the gate electrode capacitor Cgs of the power device is slow, and the turn-off speed of the power device is slow. During this phase the load current Ia starts to decrease, and an induced voltage is generated in the line
Because the turn-off speed of the power device is slowed, the turn-off time is prolonged, the amplitude of induced voltage is reduced, and the voltage born by the power device is also reduced, thereby realizing the soft turn-off of the device.
Example 2
As shown in fig. 5 and 6, a second control switch Q2, a first voltage regulator tube Z1 and a second voltage regulator tube Z2 are added on the basis of the embodiment.
Stage t 1-t 2: the power device bears a voltage U1 which is less than the nominal voltage of a first voltage regulator tube Z1, a second control switch Q2 is not switched on, a first control switch Q1 is switched on under the action of Vcc, and a second resistor R2 and a third resistor R3 are connected in parallel.
Stage t 2-t 3: the voltage of the power device S1 begins to rise, but the voltage born by the power device is more than U1 and less than the nominal voltage of the first voltage regulator tube Z1, the second control switch Q2 is not switched on, the first control switch Q1 keeps a switching-on state, and the second resistor R2 and the third resistor R3 keep a parallel connection state.
Stage t 3-t 4: at the time of t3, the power device bears a voltage U1 which is larger than the nominal voltage of the first voltage regulator tube Z1, the second control switch Q2 is switched on, the first control switch Q1 is switched off, the third resistor R3 is not connected with the second resistor R2 in parallel, and the driving resistor is only the second resistor R2.
According to the invention, the turn-off process is processed in a segmented manner, the turn-off speed is increased at the stages of t 1-t 2 and t 2-t 3, and the turn-off speed is reduced at the stages of t 3-t 4. Accelerating the period from t2 to t3 and reducing the loss in the turn-off period; and slowing down the period from t3 to t4, and reducing the induced voltage caused by turn-off. The total turn-off time and the total turn-off loss are balanced, so that the voltage borne by the power device is reduced, and the loss and the heat generation of the power device are reduced.
The above examples are only for illustrating the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention within the knowledge of those skilled in the art should be covered within the technical scope of the present invention as claimed.
Claims (2)
1. Power device soft-off circuit, including load, input voltage and the lead wire inductance that is in same series circuit with power device, its characterized in that: the power device is respectively connected with the voltage applied to the power device, the driving voltage and the gate electrode capacitance of the power device; a driving circuit is arranged on a circuit of the power device which is connected with the driving voltage in series; stage t 3-t 4: at the moment of t3, the sampling voltage rises to exceed the reference voltage, at the moment, the sampling voltage (b) > the reference voltage (a), the first control switch (Q1) is in a turn-off state, the third resistor (R3) is not connected with the second resistor (R2) in parallel, the turn-off driving resistor is only the second resistor (R2), and as the value of the second resistor (R2) is larger, the driving current is reduced, the discharge to the gate electrode capacitor (Cgs) of the power device is slow, and the turn-off speed of the power device is slow; stage t 3-t 4: at the time of t3, the power device bears voltage (U1) > the nominal voltage of a first voltage regulator tube (Z1), a second control switch (Q2) is switched on, a first control switch (Q1) is switched off, a third resistor (R3) is not connected with a second resistor (R2) in parallel, and a driving resistor is only the second resistor (R2); the driving circuit comprises an on driving circuit when the power device is switched on and an off driving circuit when the power device is switched off, which are arranged in parallel; the switching-on driving circuit comprises a first diode and a first resistor which are connected in series; the turn-off driving circuit comprises a second diode and a second resistor which are connected in series; the power device bears the sampling voltage of the voltage and is connected with a comparator, and the comparator is simultaneously connected with a reference voltage; a first control switch and a third resistor are connected in series in a circuit of the comparator connected with the power device; a third resistor, a first control switch, a sixth resistor, a fifth resistor, a fourth resistor and a first voltage-regulator tube are sequentially connected in series on a circuit of the power device; and a second control switch is arranged between the fifth resistor and the sixth resistor.
2. The power device soft-off circuit of claim 1, wherein: and a second voltage-regulator tube is arranged between the fifth resistor and the second control switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711147168.5A CN107769529B (en) | 2017-11-17 | 2017-11-17 | Soft-off circuit of power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711147168.5A CN107769529B (en) | 2017-11-17 | 2017-11-17 | Soft-off circuit of power device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107769529A CN107769529A (en) | 2018-03-06 |
| CN107769529B true CN107769529B (en) | 2020-02-07 |
Family
ID=61279842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711147168.5A Active CN107769529B (en) | 2017-11-17 | 2017-11-17 | Soft-off circuit of power device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107769529B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110958001A (en) * | 2018-12-04 | 2020-04-03 | 郑州嘉晨电器有限公司 | Switching-on circuit of field effect power tube |
| CN110957916B (en) * | 2019-01-15 | 2022-05-03 | 河南嘉晨智能控制股份有限公司 | Digital synchronous rectification method of half-bridge LLC converter |
| CN110957897A (en) * | 2019-08-07 | 2020-04-03 | 郑州嘉晨电器有限公司 | Drive circuit of a plurality of parallelly connected MOSFET switch tubes |
| CN111464007B (en) * | 2020-05-13 | 2022-05-24 | 阳光电源股份有限公司 | Method and system for restraining peak voltage at turn-off instant of full-control power switch device |
| CN111884491B (en) * | 2020-06-23 | 2022-04-08 | 华为技术有限公司 | Drive circuit with energy recovery function and switching power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231595A (en) * | 2011-07-06 | 2011-11-02 | 深圳市英威腾电气股份有限公司 | Drive circuit of insulated gate bipolar transistor |
| CN205249038U (en) * | 2015-12-30 | 2016-05-18 | 杭州士兰微电子股份有限公司 | Drive and control circuit and switching power supply |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405738C (en) * | 2004-07-09 | 2008-07-23 | 清华大学 | Driving protective circuit for inverse resistance type insulated gate bipolar transistor |
| DE102006027826B4 (en) * | 2006-06-16 | 2012-10-11 | Continental Automotive Gmbh | circuitry |
| CN201417403Y (en) * | 2009-04-01 | 2010-03-03 | 西南交通大学 | Constant power control device of switch power supply |
| CN204190374U (en) * | 2014-06-19 | 2015-03-04 | 安徽华东光电技术研究所 | A kind of DC power supply anti-surge protection circuit |
| CN105406846B (en) * | 2015-12-10 | 2018-04-27 | 北京卫星制造厂 | A kind of power tube drive control circuit suitable for solid-state power controller |
| CN107204760A (en) * | 2016-03-17 | 2017-09-26 | 中车株洲电力机车研究所有限公司 | A kind of IGBT drive devices and system |
| CN106329916B (en) * | 2016-08-29 | 2018-09-21 | 杰华特微电子（杭州）有限公司 | The driving method and circuit and power-supply system of switching tube |
| CN106655772A (en) * | 2016-09-26 | 2017-05-10 | 西安应用光学研究所 | Booster circuit having over-voltage surge function |
| CN106788367B (en) * | 2017-01-06 | 2023-06-13 | 四川埃姆克伺服科技有限公司 | IGBT driving circuit |
-
2017
- 2017-11-17 CN CN201711147168.5A patent/CN107769529B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231595A (en) * | 2011-07-06 | 2011-11-02 | 深圳市英威腾电气股份有限公司 | Drive circuit of insulated gate bipolar transistor |
| CN205249038U (en) * | 2015-12-30 | 2016-05-18 | 杭州士兰微电子股份有限公司 | Drive and control circuit and switching power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107769529A (en) | 2018-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107769529B (en) | Soft-off circuit of power device | |
| JP2008109775A (en) | Dc-dc converter and control method therefor | |
| CN103051184A (en) | Boosted circuit | |
| JP4437685B2 (en) | Gate drive circuit in power converter | |
| JP2021013259A (en) | Gate drive device and power conversion device | |
| CN101631410A (en) | AC-DC LED drive circuit with high power factor | |
| JP2009011013A (en) | Power conversion equipment | |
| JP2017511115A (en) | Gate driver for controlling fluctuation of collector-emitter voltage of electronic switch and circuit including the gate driver | |
| WO2016103328A1 (en) | Switching device, motor drive device, power conversion device, and switching method | |
| JP2021078309A (en) | Gate drive device and electric power conversion device | |
| JP6234131B2 (en) | Power module | |
| JP2008067593A (en) | Gate drive circuit for insulated gate semiconductor switching elements | |
| Schirone et al. | Loss analysis of low-voltage TLNPC step-up converters | |
| JP2006345666A (en) | Power converter | |
| Gorodny et al. | Transistor Switches Quasi-Control in Quasi-Resonant Pulse Converters | |
| JP4754866B2 (en) | Inverter power supply | |
| KR20150047648A (en) | ZVZCS Switching Converter Using Auto-Transformer | |
| RU2307441C1 (en) | Method for reducing dynamic losses in electric energy transformers | |
| CN114337219A (en) | Method for reducing starting-up peak reversal of transistor in push-pull circuit and mobile power supply | |
| CN201928186U (en) | Sliding frequency soft startup circuit applied to electromagnetic induction heating power supply | |
| CN111953209B (en) | Switch type converter and control circuit and control method thereof | |
| Li et al. | Optimal algorithm design based on a digitalized active voltage gate driver for IGBT turn-on transition | |
| CN210111852U (en) | Switching power supply voltage-reducing and voltage-boosting conversion circuit | |
| EP2637305B1 (en) | Control circuitry for controlling a semiconductor switch | |
| CN102594099A (en) | Grid drive circuit of intelligent power module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No.99, Jingbei 6th Road, Zhengzhou area (Jingkai), Henan pilot Free Trade Zone, Zhengzhou, Henan Province, 450000 Patentee after: Henan Jiachen Intelligent Control Co.,Ltd. Address before: 450016 No. 99, Jingbei 6th Road, Zhengzhou Economic and Technological Development Zone, Henan Province Patentee before: ZHENGZHOU JIACHEN ELECTRIC Co.,Ltd. |
|
| CP03 | Change of name, title or address |