CN206313435U - Current foldback circuit - Google Patents
Current foldback circuit Download PDFInfo
- Publication number
- CN206313435U CN206313435U CN201620804785.2U CN201620804785U CN206313435U CN 206313435 U CN206313435 U CN 206313435U CN 201620804785 U CN201620804785 U CN 201620804785U CN 206313435 U CN206313435 U CN 206313435U
- Authority
- CN
- China
- Prior art keywords
- circuit
- circuits
- input
- 74act245
- pim
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model provides a kind of current foldback circuit, and it solves the technical problem such as prior art complex circuit, relatively costly.This current foldback circuit, it is connected with PIM circuits or IGBT circuits, this current foldback circuit includes the first pull-up circuit being sequentially connected, comparison circuit and control circuit, the input of the first described pull-up circuit is connected with the three-phase current sampled signal for passing through signal condition, described control circuit includes 74ACT245 modules, and the described Enable Pin of 74ACT245 modules is connected with the output end of comparison circuit, the input of described 74ACT245 modules with for driving PIM circuits or the drive signal of IGBT circuits to be connected, output end is connected with the input of PIM circuits or IGBT circuits.The utility model has reasonable in design, circuit simple, the advantages of with low cost.
Description
Technical field
The utility model belongs to field of circuit technology, more particularly, to a kind of current foldback circuit.
Background technology
At present, inverter circuit is often with PIM, IGBT as power component, and PIM, IGBT of in the market do not have integrated mistake
Stream protection circuit, engineer often realizes the excessively stream of PIM, IGBT in deisgn product using the driving optocoupler with protection
Defencive function, such as using the ACPL-331J-500E of AVAGO companies.But it is past to be analogous to this optocoupler price with defencive function
It is high toward comparing, and circuit is also more complicated, materially increases the cost of product, reduces the competitiveness of product.
In order to solve the problems, such as prior art, people have carried out long-term exploration, it is proposed that solution miscellaneous
Scheme.For example, Chinese patent literature discloses a kind of IGBT protection circuit [application number：, including IGBT 201420639362.0]
Major loop signal deteching circuit, drive signal detect circuit, driving control signal drags down circuit and drive signal drags down circuit two
Person's at least one.
Although such scheme solves the problems, such as prior art complex circuit to a certain extent, the program is still deposited
：The overcurrent protection function for driving optocoupler to realize PIM, IGBT is used, the problems such as relatively costly.
The content of the invention
The purpose of this utility model is directed to above mentioned problem, there is provided a kind of simple, the with low cost mistake of reasonable in design, circuit
Stream protection circuit.
To reach above-mentioned purpose, the utility model employs following technical proposal：This current foldback circuit, with PIM circuits
Or IGBT circuits are connected, this current foldback circuit includes the first pull-up circuit, comparison circuit and the control circuit that are sequentially connected, institute
The input of the first pull-up circuit stated is connected with the three-phase current sampled signal for passing through signal condition, described control electricity
Road includes 74ACT245 modules, and the described Enable Pin of 74ACT245 modules is connected with the output end of comparison circuit, described
The input of 74ACT245 modules with for driving PIM circuits or the drive signal of IGBT circuits to be connected, output end and PIM circuits
Or the input of IGBT circuits is connected.
In above-mentioned current foldback circuit, protection circuit is provided between described comparison circuit and control circuit.
In above-mentioned current foldback circuit, described protection circuit includes diode, the output of described comparison circuit
End is connected with diode cathode, and the Enable Pin of described control circuit is connected with diode cathode.
In above-mentioned current foldback circuit, the output end of described comparison circuit and the excessively stream for recording overcurrent condition
The input of writing circuit is connected.
In above-mentioned current foldback circuit, described excessively stream writing circuit includes DSP module, described comparison circuit
Output signal is input into DSP module after sequentially passing through the second pull-up circuit and filter circuit.
Compared with prior art, the advantage of this current foldback circuit is：Reasonable in design, circuit is simple, in circuit not
The overcurrent protection function of PIM, IGBT is realized using relatively costly driving optocoupler, it is with low cost.
Brief description of the drawings
Fig. 1 provides the structural representation of the utility model embodiment.
Fig. 2 provides the structural representation that the utility model controls circuit.
In figure, the first pull-up circuit 1, comparison circuit 2, control circuit 3,74ACT245 modules 31, protection circuit 4, two poles
Pipe 41, the second pull-up circuit 52, filter circuit 53.
Specific embodiment
As shown in Figure 1 to Figure 2, this current foldback circuit, is connected with PIM circuits or IGBT circuits, this current foldback circuit
Including be sequentially connected the first pull-up circuit 1, comparison circuit 2 and control circuit 3, the input of the first pull-up circuit 1 with
Three-phase current sampled signal by signal condition is connected, and control circuit 3 includes 74ACT245 modules 31, and 74ACT245 modules
31 Enable Pin is connected with the output end of comparison circuit 2, the input of 74ACT245 modules 31 with for drive PIM circuits or
The drive signal of IGBT circuits is connected, and output end is connected with the input of PIM circuits or IGBT circuits.Comparison circuit 2 is by first
The output signal of pull-up circuit 1 is compared with alarming threshold value, if the output signal of the first pull-up circuit 1 is more than alarming threshold value
Output low level, now controls the control PIM circuits of circuit 3 or IGBT circuits to be stopped；If the output letter of the first pull-up circuit 1
Number be not more than alarming threshold value then export high level, now control circuit 3 control PIM circuits or IGBT circuit normal works.
Specifically, protection circuit 4 is provided between comparison circuit 2 and control circuit 3, protection circuit 4 includes diode 41, than
Output end compared with circuit 2 is connected with the positive pole of diode 41, controls the Enable Pin of circuit 3 to be connected with the negative pole of diode 41；Compare electric
The output end on road 2 is connected with the input of the excessively stream writing circuit for recording overcurrent condition, and excessively stream writing circuit includes DSP moulds
Block, the output signal of comparison circuit 2 is input into DSP module after sequentially passing through the second pull-up circuit 52 and filter circuit 53.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Although more used herein the first pull-up circuit 1, comparison circuit 2, control circuit 3,74ACT245 modules 31,
The terms such as protection circuit 4, diode 41, the second pull-up circuit 52, filter circuit 53, but be not precluded from use other terms can
Can property.It is used for the purpose of more easily describing and explaining essence of the present utility model using these terms；It is construed as appointing
A kind of what additional limitation is all disagreed with the utility model spirit.
Claims (1)
1. a kind of current foldback circuit, is connected, it is characterised in that this current foldback circuit includes with PIM circuits or IGBT circuits
The first pull-up circuit (1) for being sequentially connected, comparison circuit (2) and control circuit (3), described the first pull-up circuit (1) it is defeated
Enter end to be connected with the three-phase current sampled signal for passing through signal condition, described control circuit (3) includes 74ACT245 moulds
Block (31), and the Enable Pin of described 74ACT245 modules (31) is connected with the output end of comparison circuit (2), it is described
The input of 74ACT245 modules (31) with for driving PIM circuits or the drive signal of IGBT circuits to be connected, output end and PIM
The input of circuit or IGBT circuits is connected；Protection circuit (4) is provided between described comparison circuit (2) and control circuit (3),
Described protection circuit (4) includes diode (41)；The output end of described comparison circuit (2) with for recording overcurrent condition
The input of excessively stream writing circuit is connected, and described excessively stream writing circuit includes DSP module, described comparison circuit (2) it is defeated
Go out that signal sequentially passes through the second pull-up circuit (52) and filter circuit (53) is input into DSP module afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620804785.2U CN206313435U (en) | 2016-07-26 | 2016-07-26 | Current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620804785.2U CN206313435U (en) | 2016-07-26 | 2016-07-26 | Current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206313435U true CN206313435U (en) | 2017-07-07 |
Family
ID=59242752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620804785.2U Expired - Fee Related CN206313435U (en) | 2016-07-26 | 2016-07-26 | Current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206313435U (en) |
-
2016
- 2016-07-26 CN CN201620804785.2U patent/CN206313435U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104242249B (en) | A kind of protection circuit of Switching Power Supply | |
| CN105372552B (en) | A kind of load open-circuit detection circuit and method for high side switches | |
| CN204758699U (en) | A insulating impedance detection circuitry for photovoltaic inverter | |
| CN103336165B (en) | A kind of alternating current-direct current over-current detection circuit | |
| CN206401236U (en) | A kind of relay zero-crossing closes disconnecting circuit | |
| CN204190483U (en) | Power supply switch circuit | |
| CN202679686U (en) | Voltage sampling and surge protection circuit of electromagnetic stove | |
| CN203705598U (en) | Thyristor fault detection device | |
| CN102255302B (en) | Overvoltage protection circuit and IC (integrated circuit) | |
| CN204044232U (en) | A kind of high voltage display device by monitoring leakage current of an arrester | |
| CN104483579A (en) | Switching value acquisition circuit | |
| CN206313435U (en) | Current foldback circuit | |
| CN209562148U (en) | A kind of IPM overcurrent and thermal-shutdown circuit | |
| CN208781779U (en) | A kind of voltage dip protection equipment | |
| CN106602856B (en) | A kind of hardware protection circuit and its method of the over-voltage of driver busbar voltage | |
| CN204302420U (en) | A kind of switch quantity acquisition circuit | |
| CN204046570U (en) | One-chip machine port level input protection circuit | |
| CN207150418U (en) | Current foldback circuit and motor driver | |
| CN209608334U (en) | A kind of polycyclic nested protection circuit of inverter | |
| CN203660518U (en) | Insulated gate bipolar transistor overcurrent protection circuit | |
| CN203502529U (en) | Switching on/of judging circuit of electric leakage reclosure breaker | |
| CN203296562U (en) | Circuit structure used for controlling forward rotation and reverse rotation of car window direct-current motor | |
| CN202363868U (en) | Intelligent low-voltage circuit breaker selective in grounding protection and electricity leakage protection functions | |
| CN206076169U (en) | A kind of energy-saving relay | |
| CN204993054U (en) | Level device behind generator commutation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20170707 Termination date: 20210726 |