CN202435252U - IGBT (Insulate Gate Bipolar Transistor) driving and protection circuit - Google Patents
IGBT (Insulate Gate Bipolar Transistor) driving and protection circuit Download PDFInfo
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- CN202435252U CN202435252U CN 201220020689 CN201220020689U CN202435252U CN 202435252 U CN202435252 U CN 202435252U CN 201220020689 CN201220020689 CN 201220020689 CN 201220020689 U CN201220020689 U CN 201220020689U CN 202435252 U CN202435252 U CN 202435252U
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Abstract
The utility model discloses an IGBT (Insulate Gate Bipolar Transistor) driving and protection circuit, which comprises a controlled power supply, a reactor, a switch control module, an over-current sampling module, an over-current soft shut-off protection module, an over-current hard shut-off protection module, an IGBT and a micro-control unit. According to the IGBT driving and protection circuit, control steps are reduced as much as possible on the premise of guaranteeing high reliability of a PFC (Power Factor Correction) circuit to save cost, and meanwhile, free dv/dt regulation margin is reserved, so that an ideal inhibition effect is obtained in EMI (Electro-Magnetic Interference) aspect.
Description
Technical field
The utility model relates to a kind of IGBT and drives and protective circuit, belongs to the controller field of air-conditioning.
Background technology
At present, along with the deep implementation of national energy-saving and emission-reduction policy, energy-saving and environmental protection, comfortable transducer air conditioning are applied in family life and the operational environment more and more.Market up-conversion air-conditioning accounting is constantly soaring in recent years, and convertible frequency air-conditioner will become the market mainstream and the traditional fixed frequency air conditioner device of final replacement.
But meanwhile; Because the main flow frequency convertor uses the power rectifier inverter mode of AC-DC-AC at present; Its power factor is generally on the low side, and higher harmonic content is high, if do not carry out PFC (power factor correction) technical finesse; The air conditioner that is scattered in every family is very serious to the accumulation pollution meeting of electrical network, and country also puts into effect the power pollution of the strict control of conversion air conditioner of correlation technique standard to electrical network for this reason.
Be active PFC (power factor correction) technology of core thereby be used widely with IGBT (insulated gate bipolar transistor); But for air conditioner with keen competition market; Cost just becomes a key point of not walking around; How to guarantee the high reliability of pfc circuit, cost is optimum simultaneously, becomes the problem that the air-conditioner controller developer must solve.
The utility model content
The utility model be under the prerequisite of guaranteeing PFC (power factor correction) circuit high reliability, to reduce controlling unit as far as possible; Practice thrift cost; Leave the leeway of dv/dt (voltage change ratio) adjustment more freely simultaneously, so that EMI (electromagnetic interference) aspect obtains desirable inhibition effect.
For this reason, the utility model provides a kind of IGBT to drive and protective circuit.As shown in Figure 1, this IGBT drives and protective circuit comprises charged power, reactor, switch control module, overcurrent sample module, the soft turn-off protection module of overcurrent, the hard turn-off protection module of overcurrent, IGBT, micro-control unit; One port of switch control module links to each other with the PWM delivery outlet of micro-control unit, and the another port links to each other with the grid (G) of IGBT; The source electrode of IGBT (C) links to each other with reactor, and the drain electrode of IGBT (E) connects a port of overcurrent sample module; The another port of overcurrent sample module connects a port of the soft turn-off protection module of overcurrent; The another port of the soft turn-off protection module of overcurrent links to each other with the overcurrent warning port of hard turn-off protection module of overcurrent and micro-control unit; The another port of the hard turn-off protection module of overcurrent and the input port of switch control module link to each other; Positive pole of charged power (DC+) and negative pole (DC-) are connected respectively on reactor and the overcurrent sample module.
The utility model IGBT drives and protective circuit is verified and the complete machine experimental verification through a large amount of veneers, and reliability is high, and defencive function is sensitive and accurate, has the fault-signal feedback function, and the soft or hard overcurrent turn-offs double protection.
Through the adjusting of resistance in the switch control module, can regulate IGBT flexibly and open the turn-off time, control to provide with switching loss to EMI debugging and regulate the space easily
Through the adjusting of resistance in the soft turn-off protection module of overcurrent, can control the time delay of hard turn-off protection easily, for the Different control scheme that possibly occur has stayed the adjusting space.
Description of drawings
Further specify the utility model below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the schematic diagram of the utility model IGBT driving and protective circuit;
Fig. 2 is the circuit diagram of the switch control module in the utility model IGBT driving and the protective circuit;
Fig. 3 is the circuit diagram of the overcurrent sample module in the utility model IGBT driving and the protective circuit;
Fig. 4 is the circuit diagram of the soft turn-off protection module of overcurrent in the utility model IGBT driving and the protective circuit;
Fig. 5 is the circuit diagram of the hard turn-off protection module of overcurrent in the utility model IGBT driving and the protective circuit.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with concrete diagram, further set forth the utility model.
As shown in Figure 2, the switch control module in the utility model mainly is made up of triode Q1, triode Q2, triode Q3, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, diode D1, capacitor C 1.The port L2 of switch control module is connected to micro-control unit, accepts to drive from the positive logic pwm signal of micro-control unit.The port L1 of switch control module is connected to the hard turn-off protection module of overcurrent and to its control.Switch control module adopts the DC power supply of 15V.Triode Q3 conducting drags down triode Q1 base voltage when port output high level, triode Q1 conducting, and triode Q2 ends simultaneously.The port L3 of switch control module is connected to IGBT.15V voltage is imported IGBT gate pole (the G utmost point), IGBT conducting with diode D1 after capacitor C 1 is decoupled through resistance R 5.When the port output low level, triode Q3 turn-offs, so triode Q1 turn-offs; Triode Q2 base stage is dragged down the back conducting, has quickened releasing the time of electric current on the IGBT gate pole, has accelerated the time of voltage from 15V to 0V; Turn-off speed and reliability have been improved; When IGBT opened, the size of resistance R 6 can be regulated the time that the IGBT gate pole is opened, and the size of resistance R 5 can be controlled the time that IGBT turn-offs when IGBT turn-offs.
As shown in Figure 3, the overcurrent sample module in the utility model mainly is formed in parallel by resistance R 14 and resistance R 15.The resistance sizes of resistance R 14 and resistance R 15 can be used according to reality and adjust.The port L4 of overcurrent sample module connects the soft turn-off protection module of overcurrent, and port L5 connects IGBT.The operation principle of overcurrent sample module is that the existence by milliohm level resistance causes different electric currents to produce pressure drop at the resistance two ends passing to the soft turn-off protection module of overcurrent.
As shown in Figure 4, the soft turn-off protection module of the overcurrent in the utility model mainly is made up of resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, resistance R 13, capacitor C 2, capacitor C 3, voltage comparator ic 1 etc.The port L6 of the soft turn-off protection module of this overcurrent is connected to the overcurrent sample module, and port L7 is connected to the hard turn-off protection module of overcurrent.The soft turn-off protection module of this overcurrent is to use suitable voltage comparator IC1, takes out the reference level value that real-time level value and B order from the A point and compares.When A level point value during less than the B point, C point output low level guard signal, the C point is a high level at ordinary times.B point reference level is to be obtained by resistance R 10 and resistance R 12 dividing potential drops, and this reference level also is hard breaking circuit reference level simultaneously.
As shown in Figure 5, the hard turn-off protection module of the overcurrent in the utility model mainly is made up of resistance R 16, capacitor C 4, capacitor C 5, voltage comparator ic 1 etc.The port L8 of the hard turn-off protection module of this overcurrent is connected to the B point of Fig. 4, and port L9 is connected to the C point of Fig. 4, and port L20 is connected to switch control module.Because micro-control unit to taking safeguard measure that long time-delay is arranged, possibly live in IGBT from receiving the overcurrent protection signal in first protection constantly of overcurrent, therefore needs the reaction speed hard cut-off protection circuit of PFC overcurrent faster.Voltage comparator ic 1 is the C level point among Fig. 4, compares C under the normal condition through voltage comparator with B level point among Fig. 4>B; The hard shutoff is high level; Do not influence PWM control IGBT, when over current fault occurring, C point output hard cut-off protection circuit of low level while of soft shutoff is output low level also; Directly the input with switch control module drags down, and IGBT can't be received from thorough shutoff of the pwm signal of micro-control unit quit work.
Hard reaction of turn-offing is the microsecond level, and speed is exceedingly fast, but can only continue a period of time, the soft shutoff of micro-control unit work stop PWM output after, hard shutoff will be withdrawed from.That disengaging time is turn-offed in control firmly is resistance R 13 and the C6 among Fig. 4.
The utility model IGBT drives and protective circuit, has only used a voltage comparator ic 1 cheaply, and the circuit simple Devices has well reached less to control cost and improved the purpose of reliability.
By the introduction of above-mentioned functions implementation method, can know that this IGBT drive circuit defencive function is succinctly reliable, adjustment is not limited to convertible frequency air-conditioner flexibly in the application, applicable to multiple occasion.
More than be one of execution mode of the utility model,, do not spend performing creative labour, on the basis of the foregoing description, can do multiple variation, can realize the purpose of the utility model equally for those skilled in the art.But this variation obviously should be in the protection range of claims of the utility model.
Claims (2)
1. an IGBT drives and protective circuit, it is characterized in that: comprise charged power, reactor, switch control module, overcurrent sample module, the soft turn-off protection module of overcurrent, the hard turn-off protection module of overcurrent, IGBT, micro-control unit;
One port of switch control module links to each other with the PWM delivery outlet of micro-control unit, and the another port links to each other with the grid (G) of IGBT; The source electrode of IGBT (C) links to each other with reactor, and the drain electrode of IGBT (E) connects a port of overcurrent sample module; The another port of overcurrent sample module connects a port of the soft turn-off protection module of overcurrent; The another port of the soft turn-off protection module of overcurrent links to each other with the overcurrent warning port of hard turn-off protection module of overcurrent and micro-control unit; The another port of the hard turn-off protection module of overcurrent and the input port of switch control module link to each other; Positive pole of charged power (DC+) and negative pole (DC-) are connected respectively on reactor and the overcurrent sample module.
2. the IGBT shown in claim 1 drives and protective circuit, and it is characterized in that: above-mentioned overcurrent sample module mainly is formed in parallel by resistance one (R14) and resistance two (R15), and is adjustable resistance; Soft turn-off protection module of overcurrent and the shared voltage comparator of the hard turn-off protection module of overcurrent (IC1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220020689 CN202435252U (en) | 2012-01-18 | 2012-01-18 | IGBT (Insulate Gate Bipolar Transistor) driving and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220020689 CN202435252U (en) | 2012-01-18 | 2012-01-18 | IGBT (Insulate Gate Bipolar Transistor) driving and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202435252U true CN202435252U (en) | 2012-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220020689 Expired - Lifetime CN202435252U (en) | 2012-01-18 | 2012-01-18 | IGBT (Insulate Gate Bipolar Transistor) driving and protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202435252U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106803754A (en) * | 2017-02-17 | 2017-06-06 | 广东明阳龙源电力电子有限公司 | A kind of gate protection plate for gate pole protection |
| CN111224650A (en) * | 2018-11-27 | 2020-06-02 | 奥克斯空调股份有限公司 | IGBT drive circuit and air conditioner based on triode |
| CN112491012A (en) * | 2021-02-03 | 2021-03-12 | 四川蕊源集成电路科技有限公司 | Current-limiting double-protection circuit and current-limiting double-protection method of circuit |
-
2012
- 2012-01-18 CN CN 201220020689 patent/CN202435252U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106803754A (en) * | 2017-02-17 | 2017-06-06 | 广东明阳龙源电力电子有限公司 | A kind of gate protection plate for gate pole protection |
| CN106803754B (en) * | 2017-02-17 | 2023-05-23 | 广东明阳龙源电力电子有限公司 | Grid protection plate for gate protection |
| CN111224650A (en) * | 2018-11-27 | 2020-06-02 | 奥克斯空调股份有限公司 | IGBT drive circuit and air conditioner based on triode |
| CN112491012A (en) * | 2021-02-03 | 2021-03-12 | 四川蕊源集成电路科技有限公司 | Current-limiting double-protection circuit and current-limiting double-protection method of circuit |
| CN112491012B (en) * | 2021-02-03 | 2021-04-16 | 四川蕊源集成电路科技有限公司 | Current-limiting double-protection circuit and current-limiting double-protection method of circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170527 Address after: 315191 Yinzhou District Province, Ningbo City, Jiang Shan town on the village of summer ho Patentee after: AUX air conditioning Limited by Share Ltd Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Group. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |