CN201523373U - Multi-channel power MOSFET driving output short-circuit protection circuit - Google Patents
Multi-channel power MOSFET driving output short-circuit protection circuit Download PDFInfo
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- CN201523373U CN201523373U CN2009201904667U CN200920190466U CN201523373U CN 201523373 U CN201523373 U CN 201523373U CN 2009201904667 U CN2009201904667 U CN 2009201904667U CN 200920190466 U CN200920190466 U CN 200920190466U CN 201523373 U CN201523373 U CN 201523373U
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- circuit
- power mosfet
- output
- short
- supply voltage
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Abstract
The utility model discloses a multi-channel power MOSFET driving output short-circuit protection circuit. The protection circuit comprises a power supply voltage detection circuit, a register latched driving circuit with a reset-input pin and a power MOSFET output circuit and is characterized in that the power supply voltage caused by the driving output load short circuit of the power MOSFET descends is detected by monitoring a total load power supply voltage; and the detected load short-circuit signal is connected with reset pin of the register, and the register is fast reset so as to close the output of all the power MOSFET and realize the multi-channel power MOSFET driving output short-circuit protection. The protection circuit has the benefits that the protection circuit can reliably protect the multi-channel power MOSFET, is protected from being damaged by load short circuit and is characterized by simple circuit, low cost and reliable protection.
Description
[affiliated technical field]
The utility model relates to a kind of short-circuit protection circuit, especially is applied to the short-circuit protection that the multichannel power MOSFET drives output circuit.
[background technology]
Can use the multichannel power MOSFET at a lot of control appliances and drive output circuit, because the load short circuits that power MOSFET can only bear Millisecond usually, so the short-circuit protection of power MOSFET driving output is extremely important.At present, the power MOSFET driving output short circuit protection scheme of using always has selects for use power MOSFET, every road power MOSFET of band short-circuit protection to add resettable fuse etc.Last scheme major defect is the power MOSFET cost height of band short-circuit protection, and the device model specification of this class power MOSFET is few, and type selecting is difficulty relatively; The shortcoming of back one scheme is that the short circuit cut-off velocity of resettable fuse discreteness slow, that cut off electric current is bigger, and it is unreliable to protect, and every road all will add resettable fuse, and the cost height, to account for the wiring board area big.
[summary of the invention]
Drive problems such as cost height, parts selection difficulty, short circuit cut-off velocity that output short circuit protection circuit exists are slow, protection is unreliable in order to solve conventional multichannel power MOSFET; the utility model provides a kind of multichannel power MOSFET to drive the scheme that short-circuit protection is concentrated in output, has that circuit is simple, cost is low, the protection reliable characteristics.
The technical scheme that its technical problem that solves the utility model adopts is: being resetted by voltage detection circuit, band, the register of input pin latchs drive circuit, the power MOSFET output circuit is formed.Wherein, voltage detection circuit is made of electric resistance partial pressure, voltage inspection detection chip.In voltage detection circuit, the load general supply is via electric resistance partial pressure, be input to voltage checking chip then, the output of voltage checking chip is connected to the register resetting pin through the level matching circuit that is made of small-signal MOSFET pipe, register latchs output and is connected to multichannel power MOSFET, the driving output loading common source of this multichannel power MOSFET.When power MOSFET drives the output loading short circuit, to cause the quick decline of load general supply voltage, this voltage descends and is sent to voltage checking chip through bleeder circuit, voltage checking chip changes output state rapidly, produce the short circuit reset signal through level matching circuit, all power MOSFETs are promptly closed in each road output of reseting register rapidly.From load short circuits to the process of closing power MOSFET less than 1ms because power MOSFET has the big pulse current ability of bearing Millisecond, therefore can the reliable protection power MOSFET.
The beneficial effects of the utility model are, can reliable protection multichannel power MOSFETs, and exempt from load short circuits and damage, and have that circuit is simple, cost is low, the protection reliable characteristics.
[description of drawings]
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the circuit theory diagrams that the utility model multichannel power MOSFET drives a kind of embodiment of output short circuit protection circuit.
[embodiment]
In Fig. 1, U1 is a voltage checking chip, and U2 is the register die with resetting pin, can be a plurality of register die according to the output way, and Q2～Q2n is a plurality of power MOSFETs, drives RL0～RLn multichannel loading, these load sharing power supplys VCC1.Resistance R 1, R2 series connection are carried out dividing potential drop to load general supply VCC1, dividing potential drop output is connected to voltage checking chip U1, the short circuit reset output signal of voltage checking chip U1 is connected to the level matching circuit that is made of small-signal MOSFET pipe Q1 and resistance R 3, level matching circuit output is connected to the resetting pin of register die U2, the output of latching of register die U2 is connected to power MOSFET Q2～Q2n through resistance R 4～R4n, power MOSFET drives load RL0～RLn, and load RL0～RLn is connected to power supply VCC1.
Claims (3)
1. a multichannel power MOSFET drives output short circuit protection circuit; it is characterized in that: this protective circuit is resetted by voltage detection circuit, band, and the register of input pin latchs drive circuit, the power MOSFET output circuit is formed; by monitoring to load general supply voltage; the caused supply voltage of driving output loading short circuit that detects power MOSFET descends; the load short circuits signal that detects is connected to the register resetting pin; reseting register is closed the output of all power MOSFETs fast, realizes that the multichannel power MOSFET drives output short circuit protection.
2. multichannel power MOSFET according to claim 1 drives output short circuit protection circuit; it is characterized in that: voltage detection circuit is made of electric resistance partial pressure, voltage checking chip; supply voltage is input to voltage checking chip behind electric resistance partial pressure, output short-circuit signal when supply voltage causes that because of power MOSFET drives output short-circuit supply voltage descends.
3. multichannel power MOSFET according to claim 1 drives output short circuit protection circuit, it is characterized in that: the multichannel loading common source that the power MOSFET output circuit is driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201904667U CN201523373U (en) | 2009-07-29 | 2009-07-29 | Multi-channel power MOSFET driving output short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201904667U CN201523373U (en) | 2009-07-29 | 2009-07-29 | Multi-channel power MOSFET driving output short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201523373U true CN201523373U (en) | 2010-07-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201904667U Expired - Lifetime CN201523373U (en) | 2009-07-29 | 2009-07-29 | Multi-channel power MOSFET driving output short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201523373U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217615A (en) * | 2013-03-27 | 2013-07-24 | 上海贝岭股份有限公司 | Output short-circuit detection circuit |
-
2009
- 2009-07-29 CN CN2009201904667U patent/CN201523373U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217615A (en) * | 2013-03-27 | 2013-07-24 | 上海贝岭股份有限公司 | Output short-circuit detection circuit |
| CN103217615B (en) * | 2013-03-27 | 2015-03-25 | 上海贝岭股份有限公司 | Output short-circuit detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG KEQIANG INTELLIGENT CONTROL SYSTEM CO., L Free format text: FORMER NAME: |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Xihu District Macheng road 310012 Hangzhou City, Zhejiang province No. 36 Patentee after: Zhejiang Keqiang Intelligent Control System Co., Ltd. Address before: Xihu District Macheng road 310012 Hangzhou City, Zhejiang province No. 36 Patentee before: Hangzhou Keqiang Intelligent Control System Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100707 |