CN106357248A - Induction cooker power-on IGBT (insulated gate bipolar transistor) protection method - Google Patents
Induction cooker power-on IGBT (insulated gate bipolar transistor) protection method Download PDFInfo
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- CN106357248A CN106357248A CN201510442481.6A CN201510442481A CN106357248A CN 106357248 A CN106357248 A CN 106357248A CN 201510442481 A CN201510442481 A CN 201510442481A CN 106357248 A CN106357248 A CN 106357248A
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- igbt
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- reset signal
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Abstract
The invention relates to an induction cooker power-on IGBT (insulated gate bipolar transistor) protection method, solves the problem that a prior induction cooker requires IGBT protection by an additional circuit upon power-on, and provides a simpler and more reliable induction cooker control circuit. The method is characterized mainly in that a power-on reset signal is added to an IGBT drive circuit, low level of certain period (it is ensured that an IGBT is turned off during the low level) is generated during power-on of an induction cooker, and the low level turns into a high level signal over a certain period; in the IGBT drive circuit, the reset signal is subjected to NAND with a MCU (microcontroller unit) control signal and is processed via the circuit such that the IGBT drive circuit outputs a low level signal to turn off the IGBT during resetting (the reset signal is of low level), and after the reset signal is finished (the reset signal is of high level), an output signal of an IGBT drive chip changes with the MCU control signal to control the IGBT.
Description
Technical field
The present invention relates to igbt drives protection field, particularly to electromagnetic oven igbt power-on protection.
Background technology
With the development of technology, to household appliances reliability requirement more and more higher, the today becoming increasingly popular in electromagnetic oven, various igbt power-on protection circuits also emerge in an endless stream for consumer, make the reliability more and more higher of electromagnetic oven.
In existing technology, a lot of igbt power-on protection circuits are realized by external add-in circuit, and not only reliability is inadequate for these circuit, and brings fringe cost.
The present invention is referred from problem above, the design in conjunction with association area and professional experiences, proposes, for electromagnetic oven igbt device, the method protecting ibgt based on driving chip, makes the control of electromagnetic oven igbt simpler, reliable.
Content of the invention
The invention aims to solving electromagnetic stove control system during upper electricity, mcu must have one section of power-on reset time, during this power-on reset time, if not providing protection it would be possible to making igbt turn on excessively stream for a long time and damaging to igbt.For this reason, system must be protected by igbt during upper electricity.
To achieve the above object, a kind of method that the present invention protects igbt during providing and providing electrification reset in driving chip in igbt, comprises the steps:
1st, during upper electricity, produce a low level reset signal, after certain time, reset signal is changed into high level signal, during low level resets, chip will close igbt, to reach the purpose of power-on protection igbt；
2nd, low level reset signal and mcu are controlled the signal phase of igbt with non-and produce new control signal；
3rd, new control signal is processed and level shift so as to directly control igbt, in a processing circuit simultaneously, make output signal when reset signal is for low level " 0 ", it is output as low level, when reset signal is for high level " 1 ", only follow the change of mcu control signal.
Brief description
Fig. 1 is embodiment theory diagram.
In figure in-phase end a, end of oppisite phase b are from mcu control signal, during different driving mode, access signal difference, concrete cut-in method describes in a specific embodiment.
Specific embodiment
The following is embodiment of the present invention, due to opening igbt two ways when opening igbt and mcu output low level when in electromagnetic stove control system, having mcu output high level；Therefore, in this description, mcu high level and low level are opened igbt two ways and concentrate in together description explanation, if driving chip is opened igbt and mcu low level as mcu high level open two kinds of independent chips of igbt, also in the row of this patent protection.The inventive point of this invention is the generation of f signal in Fig. 1.
First, mcu high level output signal unlatching igbt mode:
001st, open under igbt mode in mcu high level output signal, signal is accessed by in-phase end a, and end of oppisite phase b does not vacantly connect；
002nd, during upper electricity, reset signal c is a low level, and after certain time (about 200 milliseconds), reset signal c is changed into high level signal；
003rd, by reset signal c and control signal d and e phase with non-and produce new control signal f；
004th, new control signal f level shift is produced new control signal g, control signal f is in vcc (ordinary circumstance is 5v) level, control signal g is output as vdd (ordinary circumstance is 15v), control signal f is in 0 level, control signal g is output as 0 level, to control igbt.
2nd, mcu low-level output signal unlatching igbt mode:
005th, open under igbt mode in mcu low-level output signal, signal is accessed by end of oppisite phase b, and in-phase end a does not vacantly connect；
006th, during upper electricity, reset signal c is a low level, and after certain time (about 200 milliseconds), reset signal c is changed into high level signal；
007th, by reset signal c and control signal d and e phase with non-and produce new control signal f；
008th, new control signal f level shift is produced new control signal g, control signal f is in vcc (ordinary circumstance is 5v) level, control signal g is output as vdd (ordinary circumstance is 15v), control signal f is in 0 level, control signal g is output as 0 level, to control igbt.
Claims (3)
1. a kind of method of electromagnetic oven power-on protection igbt is it is characterised in that the mcu working as in electromagnetic stove control system is starting shooting
Shi Youyi section power-on reset time, mcu is introduced into program and runs, and the on off state now of the igbt in system does not know, this
When open for preventing igbt from opening by mistake, this invention introduces power-on reset signal in igbt driving chip it is ensured that igbt is in the upper electric phase
Between be closed.
2. a kind of method of electromagnetic oven power-on protection igbt according to claim 1, is characterized in that, igbt drives core
Piece circuit, in system boot, produces the low level reset signal of certain time, is maintained high level (5v after certain time
Voltage) signal.
3. a kind of a kind of as claimed in claim 1 method of electromagnetic oven power-on protection igbt is it is characterised in that utilize igbt
The control signal phase NAND Logic computing that the reset signal that driving chip produces is produced with mcu, obtains new control signal, should
Signal is through processing of circuit to control igbt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510442481.6A CN106357248A (en) | 2015-07-17 | 2015-07-17 | Induction cooker power-on IGBT (insulated gate bipolar transistor) protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510442481.6A CN106357248A (en) | 2015-07-17 | 2015-07-17 | Induction cooker power-on IGBT (insulated gate bipolar transistor) protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106357248A true CN106357248A (en) | 2017-01-25 |
Family
ID=57842778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510442481.6A Pending CN106357248A (en) | 2015-07-17 | 2015-07-17 | Induction cooker power-on IGBT (insulated gate bipolar transistor) protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106357248A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201663720U (en) * | 2009-12-31 | 2010-12-01 | 深圳和而泰智能控制股份有限公司 | Induction cooker controller with IGBT protective circuit and induction cooler |
| CN103297009A (en) * | 2013-06-24 | 2013-09-11 | 成都鸿芯纪元科技有限公司 | Field programmable gate array (FPGA) power-on reset system |
| CN104467773A (en) * | 2014-12-09 | 2015-03-25 | 常熟开关制造有限公司(原常熟开关厂） | IGBT driving device and IGBT power module |
-
2015
- 2015-07-17 CN CN201510442481.6A patent/CN106357248A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201663720U (en) * | 2009-12-31 | 2010-12-01 | 深圳和而泰智能控制股份有限公司 | Induction cooker controller with IGBT protective circuit and induction cooler |
| CN103297009A (en) * | 2013-06-24 | 2013-09-11 | 成都鸿芯纪元科技有限公司 | Field programmable gate array (FPGA) power-on reset system |
| CN104467773A (en) * | 2014-12-09 | 2015-03-25 | 常熟开关制造有限公司(原常熟开关厂） | IGBT driving device and IGBT power module |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170125 |