CN105429098A - Vehicle-mounted direct current motor driving chip overcurrent protection system - Google Patents
Vehicle-mounted direct current motor driving chip overcurrent protection system Download PDFInfo
- Publication number
- CN105429098A CN105429098A CN201510965372.2A CN201510965372A CN105429098A CN 105429098 A CN105429098 A CN 105429098A CN 201510965372 A CN201510965372 A CN 201510965372A CN 105429098 A CN105429098 A CN 105429098A
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- China
- Prior art keywords
- current
- motor drive
- signal
- driving chip
- sampling resistor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- Control Of Electric Motors In General (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention discloses a vehicle-mounted direct current motor driving chip overcurrent protection system. A motor driving chip and a microcontroller are powered by a power supply; the microcontroller outputs a control signal to the motor driving chip to control the operation of the motor; an operation loop of the motor is connected with a sampling resistor in series; the sampling resistor converts a current signal in the loop into a voltage signal; the current signal is amplified through an amplifier and then the amplified current signal is output to an overcurrent response circuit; and the overcurrent response circuit controls the on-off of the signal transmitted to the motor driving chip from the microcontroller. The vehicle-mounted direct current motor driving chip overcurrent protection system has the advantage of quite high instantaneity; the response time of the whole system is within 10uS from the moment that the sampling resistor samples the overcurrent signal to the moment that the overcurrent response circuit stably outputs; and therefore, the protection mechanism of the motor driving chip is perfected to a large extent, and the reliability of the motor driving chip in use is improved.
Description
Technical field
The present invention relates to vehicle electric field, particularly relate to Vehicular direct-current motor drive ic Over Current Protection System.
Background technology
At present along with the continuous expansion of the automobile industry of China and perfect, the direct current machine that automobile uses is also along with the driving chip turning to integration degree high by traditional Control controls, although use driving chip control mode to have many-sided advantage perhaps than use traditional relay control mode, but shortcoming also comes out gradually, for example, when damaging appears in the drive system of vehicle-mounted motor, as long as it is just passable that perhaps traditional relay control mode changes the relay damaged, but for driving chip control mode, the whole control module at driving chip place will be changed, this just means and considerably increases maintenance cost, therefore generally the drive system of vehicle-mounted motor can need very high reliability, self-protection function is very perfect.
Summary of the invention
Technical problem to be solved by this invention realizes a kind of Vehicular direct-current motor drive ic that makes when overcurrent, and teaching display stand protection fast, avoids driving chip to occur overcurrent damage, improves reliability, the durability of motor drive ic.
To achieve these goals; the technical solution used in the present invention is: Vehicular direct-current motor drive ic Over Current Protection System; power supply is that motor drive ic and microcontroller are powered; microcontroller outputs control signals to motor drive ic and controls machine operation; sampling resistor is in series with in the performance loop of described motor; described sampling resistor converts the current signal in loop to voltage signal; after current signal amplifies by amplifier, exported to current responsive circuit again, described current responsive circuit of crossing controls the break-make that microcontroller is delivered to motor drive ic signal.
The voltage signal of described sampling resistor is delivered to operational amplifier B after operational amplifier A is amplified, and described operational amplifier B outputs voltage signal to the negative pole of comparator B, and the positive pole of described comparator B meets reference voltage V
refsignal, described comparator B exports the base stage of termination NPN type triode Q5 and triode Q6, and the grounded emitter of described triode Q5 and triode Q6, collector electrode connects on the circuit of motor drive ic signal input part.
The sampling resistor of the other ground connection of described motor drive ic power output end, described sampling resistor is made up of 3 2512 encapsulation 30 milliohm resistance parallel with one another.
The invention has the advantages that there is very high instantaneity; collect over-current signal from sampling resistor and be the stable output of current responsive circuit; the response time of whole system, the protection mechanism that this makes it possible to motor drive ic perfect to a great extent, improved dependability within 10uS.
Accompanying drawing explanation
Below the content that width accompanying drawing every in specification of the present invention is expressed is briefly described:
Fig. 1 is Vehicular direct-current motor drive ic Over Current Protection System structured flowchart;
Fig. 2 is Vehicular direct-current motor drive ic Over Current Protection System circuit theory diagrams.
Embodiment
In actual use; the load current exceeding tolerance range is the one of the main reasons damaged of motor drive ic often; although driving chip generally also has the overcurrent protection mechanism of oneself; but be mostly that the heat that the metal-oxide-semiconductor flowing through driving chip inside according to big current produces is implemented to protect; such protection mechanism needs metal-oxide-semiconductor by the time to save bit by bit enough heats could start; lack instantaneity, and the protection mechanism of this " overheated " also can affect useful life.For this kind of situation; native system adopts at the peripheral another increase current monitoring circuit of driving chip and crosses current responsive circuit; the size of current of motor drive ic is flow through in monitoring constantly; when electric current exceeds the scope of setting; cross current responsive circuit to start; cut off motor drive ic input immediately, cut off electric current, realize defencive function.
As shown in Figure 1, the working mechanism of native system mainly converts the current signal in loop to voltage signal by the sampling resistor be connected in machine operation loop, current responsive circuit was exported to again after current signal amplifies by certain multiple by amplifier, cross current responsive circuit and judge whether current input signal exceeds the fixed threshold values of this circuit presets, as exceeded, cut off the input signal of motor drive ic, if do not exceeded, then keep current state constant.
Fig. 2 is that the main devices related to has microcontroller, vehicle-mounted motor drive ic BTS7810K, Milliohm resistance, two-way amplifier LM2904, NPN triode BC846B, diode BAS21.
Operation principle is when BTS7810K works, operating current flows through and is connected on Milliohm resistance in performance loop (herein for the consideration of power, use 3 the 2512 30 milliohm resistance encapsulated, so 10 milliohm impedances can be shown as on the whole), these resistance two ends can produce a voltage V1 like this, this voltage V1, after operational amplifier A is amplified (multiplication factor is about 10 times) herein, obtains voltage V2, exports to another road operational amplifier B and microcontroller.When operational amplifier B obtains voltage V2, the reference voltage Vref that can and self preset compares, if when V2 is less than Vref, operational amplifier input low level, the not conducting of rear class NPN triode, when V2 is greater than Vref, operational amplifier can export high level, this high level one side feeds back to input through electric capacity and diode and is drawn high by voltage V2, and one side drives rear class NPN triode ON; The V2 drawn high makes again amplifier B continue to export high level; thus make amplifier B form similar " self-locking " state; can export high level (high level of note: V2 drags down by microcontroller always; thus remove " self-locking " state of amplifier B); ensure that rear class NPN triode is in conducting state always; and the input of BTS7810K can be cut off by the triode of conducting, thus realize defencive function.
This protection system circuit is simple, with low cost, is easy to realize, can when overcurrent appears in electric motor loop, and the input of very first time cut-out driving chip, can avoid driving chip to damage because of overcurrent to a great extent.In addition, native system is portable strong, can be used as the protection system of other drive circuits, is not limited to vehicle-mounted motor driven systems.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (3)
1. Vehicular direct-current motor drive ic Over Current Protection System; power supply is that motor drive ic and microcontroller are powered; microcontroller outputs control signals to motor drive ic and controls machine operation; it is characterized in that: in the performance loop of described motor, be in series with sampling resistor; described sampling resistor converts the current signal in loop to voltage signal; after current signal amplifies by amplifier, exported to current responsive circuit again, described current responsive circuit of crossing controls the break-make that microcontroller is delivered to motor drive ic signal.
2. Vehicular direct-current motor drive ic Over Current Protection System according to claim 1; it is characterized in that: the voltage signal of described sampling resistor is delivered to operational amplifier B after operational amplifier A is amplified; described operational amplifier B outputs voltage signal to the negative pole of comparator B, and the positive pole of described comparator B meets reference voltage V
refsignal, described comparator B exports the base stage of termination NPN type triode Q5 and triode Q6, and the grounded emitter of described triode Q5 and triode Q6, collector electrode connects on the circuit of motor drive ic signal input part.
3. Vehicular direct-current motor drive ic Over Current Protection System according to claim 1 and 2; it is characterized in that: the sampling resistor of the other ground connection of described motor drive ic power output end, described sampling resistor is made up of 3 2512 encapsulation 30 milliohm resistance parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510965372.2A CN105429098A (en) | 2015-12-18 | 2015-12-18 | Vehicle-mounted direct current motor driving chip overcurrent protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510965372.2A CN105429098A (en) | 2015-12-18 | 2015-12-18 | Vehicle-mounted direct current motor driving chip overcurrent protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105429098A true CN105429098A (en) | 2016-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510965372.2A Pending CN105429098A (en) | 2015-12-18 | 2015-12-18 | Vehicle-mounted direct current motor driving chip overcurrent protection system |
Country Status (1)
| Country | Link |
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| CN (1) | CN105429098A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732868A (en) * | 2017-09-21 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of overcurrent protection control method and overcurrent protective device |
| CN108092235A (en) * | 2017-12-08 | 2018-05-29 | 九牧智能厨卫（安徽）有限公司 | The pure hardware protection device of a kind of over current of motor or stall, method and its application |
| CN111257732A (en) * | 2020-02-17 | 2020-06-09 | 上海艾为电子技术股份有限公司 | Linear motor driving chip testing method and system |
| CN112350268A (en) * | 2020-09-25 | 2021-02-09 | 北京智科车联科技有限公司 | Vehicle power supply control device and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130154597A1 (en) * | 2011-12-19 | 2013-06-20 | Tyco Safety Products Canada Ltd. | Latching over-current protection circuit and method |
| CN103187908A (en) * | 2011-12-29 | 2013-07-03 | 中山大洋电机股份有限公司 | Brushless direct current motor controller with function of automatically adjusting phase advance angle |
| CN104047881A (en) * | 2014-06-13 | 2014-09-17 | 佛山市顺德万和电气配件有限公司 | Integration control device for direct current fan |
| CN104734630A (en) * | 2013-12-19 | 2015-06-24 | 湖北歌润新能源有限责任公司 | Over-current protection and startup recovery circuit for solar photovoltaic controller |
| CN205178471U (en) * | 2015-12-18 | 2016-04-20 | 埃泰克汽车电子(芜湖)有限公司 | On -vehicle direct current motor driver chip overcurrent protection system |
-
2015
- 2015-12-18 CN CN201510965372.2A patent/CN105429098A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130154597A1 (en) * | 2011-12-19 | 2013-06-20 | Tyco Safety Products Canada Ltd. | Latching over-current protection circuit and method |
| CN103187908A (en) * | 2011-12-29 | 2013-07-03 | 中山大洋电机股份有限公司 | Brushless direct current motor controller with function of automatically adjusting phase advance angle |
| CN104734630A (en) * | 2013-12-19 | 2015-06-24 | 湖北歌润新能源有限责任公司 | Over-current protection and startup recovery circuit for solar photovoltaic controller |
| CN104047881A (en) * | 2014-06-13 | 2014-09-17 | 佛山市顺德万和电气配件有限公司 | Integration control device for direct current fan |
| CN205178471U (en) * | 2015-12-18 | 2016-04-20 | 埃泰克汽车电子(芜湖)有限公司 | On -vehicle direct current motor driver chip overcurrent protection system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732868A (en) * | 2017-09-21 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of overcurrent protection control method and overcurrent protective device |
| CN108092235A (en) * | 2017-12-08 | 2018-05-29 | 九牧智能厨卫（安徽）有限公司 | The pure hardware protection device of a kind of over current of motor or stall, method and its application |
| CN108092235B (en) * | 2017-12-08 | 2024-04-26 | 南安九牧智能晾晒科技有限公司 | Pure hardware protection device and method for motor overcurrent or stalling and application thereof |
| CN111257732A (en) * | 2020-02-17 | 2020-06-09 | 上海艾为电子技术股份有限公司 | Linear motor driving chip testing method and system |
| CN112350268A (en) * | 2020-09-25 | 2021-02-09 | 北京智科车联科技有限公司 | Vehicle power supply control device and vehicle |
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Application publication date: 20160323 |