CN104378098B - Power on buffer circuit and electric vehicle motor control system - Google Patents
Power on buffer circuit and electric vehicle motor control system Download PDFInfo
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- CN104378098B CN104378098B CN201410682267.3A CN201410682267A CN104378098B CN 104378098 B CN104378098 B CN 104378098B CN 201410682267 A CN201410682267 A CN 201410682267A CN 104378098 B CN104378098 B CN 104378098B
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Abstract
The present invention provides one kind to power on buffer circuit and electric vehicle motor control system, and the buffer circuit that powers on includes digital signal processor, MOSFET driving circuits, voltage sample circuit and buffered power circuit, wherein：The buffered power circuit includes power resistor and MOSFET；The voltage sample circuit, for sampling the voltage at main contactor both ends；During for meeting slow breakdown beginning condition in the voltage for receiving buffering and powering on instruction and the sampling, drive signal driving MOSFET conductings are sent to MOSFET driving circuits for the digital signal processor；When the voltage satisfaction of the sampling is delayed and opens completion condition, stop sending drive signal to MOSFET driving circuits, and after the completion of the Cgs electric discharges of the MOSFET, output makes the signal of main contactor closure.The present invention utilizes the strong overload capacity of MOSFET, and snubber contact device can effectively be replaced to realize the capacitive load fast powering-up of power system of electric automobile major loop.
Description
Technical field
The present invention relates to Motor Control Fields, and buffer circuit and electric vehicle motor control are powered on more specifically to one kind
System processed.
Background technology
By the development in more than ten years, Chinese electric car industry from small to large, has formed an industrial colony in large scale,
After 21st century, high speed development situation is presented in entire industry.
At present in the electric machine control system of most domestic electric car, it is required in the main contact of dynamical system major loop series connection
Device with ensure system safety, meanwhile, motor control also needs to dynamical system major loop parallel connection large bulk capacitance with provide enough
Ripple current.In order to overcome the dash current that capacitive load is generated in High Pressure Difference, generally use powers on snubber contact device simultaneously
Main contactor both ends are associated in, to avoid main contactor adhesion.
Said program is simple in structure, but there are design cost it is high the problem of.And it is with former other motor frequency conversions control
System is compared, electric car there are start and stop it is frequent the features such as, and snubber contact device belongs to rapid wear device so that system reliability drops significantly
It is low.Simultaneous buffering contactor with dynamical system major loop busbar voltage raise and volume is increasing, this will cause product work(
Rate density is relatively low.
The content of the invention
The technical problem to be solved in the present invention is, for above-mentioned electric machine control system power on buffer structure reliability it is low,
The problem of power density is relatively low provides one kind and powers on buffer circuit and electric vehicle motor control system.
The technical solution of present invention solution above-mentioned technical problem is to provide one kind and powers on buffer circuit, including digital signal
Processor, MOSFET driving circuits, voltage sample circuit and buffered power circuit, wherein：
The buffered power circuit includes power resistor and MOSFET, and the drain electrode of the MOSFET connects via power resistor
Be connected to one end of the main contactor of high pressure major loop, source electrode is connected to the other end of the main contactor, grid be connected to it is described
The output terminal of MOSFET driving circuits；
The voltage sample circuit, for the voltage that samples the main contactor both ends and by the voltage output of the sampling
To digital signal processor；
The digital signal processor, for meeting slow breakdown in the voltage for receiving buffering and powering on instruction and the sampling
During beginning condition, drive signal driving MOSFET conductings are sent to MOSFET driving circuits；Meet slow open in the voltage of the sampling
During completion condition, stop sending drive signal to MOSFET driving circuits, and after the completion of the Cgs electric discharges of the MOSFET, it is defeated
The signal that main contactor of sening as an envoy to is closed；
Two terminal voltages and main contactor both ends of the voltage including main contactor of the voltage sample circuit sampling
Pressure difference；The slow breakdown beginning condition is below the first setting value for two terminal voltages of sampling, and the pressure difference of the sampling is higher than
Second setting value；The slow completion condition that opens is that two terminal voltages sampled in setting time are below the first setting value, and
The pressure difference of the sampling is equal to or less than the second setting value.
Power on buffer circuit of the present invention, the buffered power circuit further include be serially connected in power resistor with
Power diode between MOSFET, and the anode of the power diode be connected to via power resistor main contactor one end,
Cathode is connected to the drain electrode of MOSFET.
Buffer circuit is powered on of the present invention, the digital signal processor sends to MOSFET driving circuits
Drive signal is the high frequency square wave of constant frequency, and the MOSFET driving circuits include driving chip, capacitance, booster type and become
Depressor and rectification circuit, wherein：The driving chip is connected to the primary side of booster type transformer via capacitance, and for inciting somebody to action
High frequency square wave from digital signal processor is amplified；The secondary of the booster type transformer is connected to the defeated of rectification circuit
Enter end, and the output terminal of the rectification circuit is connected to the grid of MOSFET.
Buffer circuit is powered on of the present invention, the digital signal processor meets in the voltage of sampling slow opens end
Only stop sending drive signal to MOSFET during condition, the slow end condition that opens sets for two terminal voltages of sampling more than first
Definite value or the pressure difference sampled in setting time are more than the second setting value.
The present invention also provides a kind of electric vehicle motor control systems, including digital signal processor, are connected to electrical vehicular power
The main contactor of main loop, the control system further include MOSFET driving circuits, voltage sample circuit and buffering work(
Rate circuit, wherein：
The buffered power circuit includes power resistor and MOSFET, and the drain electrode of the MOSFET connects via power resistor
It is connected to one end of main contactor, source electrode is connected to the other end of the main contactor, grid is connected to MOSFET driving circuits
Output terminal；
The voltage sample circuit, for the voltage that samples the main contactor both ends and by the voltage output of the sampling
To digital signal processor；
The digital signal processor, for meeting slow breakdown in the voltage for receiving buffering and powering on instruction and the sampling
During beginning condition, drive signal driving MOSFET conductings are sent to MOSFET driving circuits；Meet slow open in the voltage of the sampling
During completion condition, stop sending drive signal to MOSFET driving circuits, and after the completion of the Cgs electric discharges of the MOSFET, it is defeated
The signal that main contactor of sening as an envoy to is closed；
Two terminal voltages and main contactor both ends of the voltage including main contactor of the voltage sample circuit sampling
Pressure difference；The slow breakdown beginning condition is below the first setting value for two terminal voltages of sampling, and the pressure difference of the sampling is higher than
Second setting value；The slow completion condition that opens is that two terminal voltages sampled in setting time are below the first setting value, and
The pressure difference of the sampling is equal to or less than the second setting value.
In electric vehicle motor control system of the present invention, the buffered power circuit, which further includes, is serially connected in power electricity
Power diode between resistance and MOSFET, and the anode of the power diode is connected to the one of main contactor via power resistor
End, cathode are connected to the drain electrode of MOSFET.
In electric vehicle motor control system of the present invention, the digital signal processor is to MOSFET driving circuits
The drive signal of transmission is the high frequency square wave of constant frequency, and the MOSFET driving circuits include driving chip, capacitance, liter
Die mould transformer and rectification circuit, wherein：The driving chip is connected to the primary side of booster type transformer via capacitance, uses
And it is amplified in by the high frequency square wave from digital signal processor；The secondary of the booster type transformer is connected to rectified current
The input terminal on road, and the output terminal of the rectification circuit is connected to the grid of MOSFET.
In electric vehicle motor control system of the present invention, the digital signal processor meets in the voltage of sampling
Delay and stop sending drive signal to MOSFET when opening end condition, the slow end condition that opens is more than for two terminal voltages of sampling
First setting value or the pressure difference sampled in setting time are more than the second setting value.
The present invention's powers on buffer circuit and electric vehicle motor control system, using the strong overload capacity of MOSFET, can have
Effect replaces the capacitive load fast powering-up of snubber contact device realization power system of electric automobile major loop.Also, since MOSFET has
There is the characteristics of small, overcurrent capability is strong, the present invention can greatly improve the power density of electric machine control system.
Description of the drawings
Fig. 1 is the schematic diagram that the present invention powers on buffer circuit embodiment.
Fig. 2 is the schematic diagram that the present invention powers on another embodiment of buffer circuit.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, being the schematic diagram that the present invention powers on buffer circuit embodiment, electric vehicle control system etc. can be realized
Capacitive load fast powering-up.Buffer circuit includes digital signal processor 11 to powering in the present embodiment, MOSFET drives
Circuit 12, voltage sample circuit 13 and buffered power circuit 14, and digital signal processor 11, MOSFET driving circuits 12 with
And buffered power circuit 14 is sequentially connected, the input terminal of voltage sample circuit 13 is connected to high-pressure system major loop, such as electronic
The dc bus of vehicle dynamical system.It is serially connected with to ensure the main contact of the security of system in above-mentioned high-pressure system major loop
Device；It is also parallel with to provide the large bulk capacitance of enough ripple currents in the high-pressure system major loop simultaneously.
Buffered power circuit 14 includes power resistor R1 and MOSFET, and the drain electrode of the MOSFET connects via power resistor R1
It is connected to one end (i.e. dc bus BUS1+) of the main contactor of high pressure major loop, source electrode is connected to the other end of main contactor (i.e.
Dc bus BUS2+), grid be connected to the output terminals of MOSFET driving circuits 12.It is slow that above-mentioned power resistor R1 can play limitation
The effect of electric current is rushed, big dash current is avoided to damage MOSFET.
Voltage sample circuit 13 is used to sample the voltage at main contactor both ends and by the voltage output of sampling to digital signal
Processor 11.The voltage sample circuit 13 can be used optocoupler, amplifier modulate circuit etc. and carry out voltage sample and sampled signal output.
Digital signal processor 11 be used for receive buffering power on instruction (such as from external input) and sample electricity
When pressure meets slow breakdown beginning condition, drive signal is sent to MOSFET driving circuits 12 so that MOSFET to be driven to turn on；Believe in number
Number processor 11 continues during MOSFET driving circuits 12 send drive signal, if the voltage of sampling meets slow open and completes item
Part, then digital signal processor 11 stops sending drive signal to MOSFET driving circuits 12, and has discharged in the Cgs of MOSFET
Cheng Hou, output make the signal that main contactor is closed.
The above-mentioned strong overload capacity for powering on buffer circuit and utilizing MOSFET, effectively can replace snubber contact device to realize electric car
The capacitive load fast powering-up of dynamical system major loop.Also, since MOSFET has the spy small, overcurrent capability is strong
Point can greatly improve the power density of electric machine control system.
Particularly, the voltage that above-mentioned voltage sample circuit 13 samples includes two terminal voltages of main contactor and main contact
The pressure difference at device both ends；Slow breakdown beginning condition is below the first setting value (i.e. overvoltage protection voltage) for two terminal voltages of sampling,
And the pressure difference of sampling is higher than the second setting value；The slow completion condition that opens is that two terminal voltages sampled in setting time are below the
One setting value (i.e. overvoltage protection voltage), and the pressure difference sampled is equal to or less than the second setting value.
For main contactor BUS2+ terminal voltages in high pressure major loop is avoided to pour in down a chimney to BUS1+ ends, above-mentioned buffered power circuit 14
The power diode D being serially connected between power resistor R1 and MOSFET is may also include, and the anode of power diode D is via work(
Rate resistance R1 is connected to main contactor BUS1+ ends, cathode is connected to the drain electrode of MOSFET.
As shown in Fig. 2, in the electric vehicle motor control system of the present invention powers on another embodiment of buffer circuit, number
Signal processor 11 is to the high frequency square wave that the drive signal that MOSFET driving circuits 12 are sent is constant frequency, and MOSFET drives
Circuit 12 specifically includes driving chip 121, capacitance C1, booster type transformer T and rectification circuit 122.
The driving signal output end of the input terminal connection digital signal processor 11 of above-mentioned driving chip 121, and for inciting somebody to action
High frequency square wave from digital signal processor 11 is amplified.The output terminal of the driving chip 121 is through capacitance C1 connections
To the primary side of booster type transformer T.The secondary of booster type transformer T is connected to the input terminal of rectification circuit 122, and rectification circuit
122 output terminal is connected to the grid of MOSFET.
When high-pressure system control circuit completes power-on self-test, digital signal processor 11 is adopted in confirmation voltage sample circuit 13
After the voltage of sample meets buffering beginning condition, response buffering powers on instruction, sends the high frequency square wave of constant frequency.The high frequency square wave
Amplify by driving chip 121, then positive and negative square wave is formed via capacitance C1, be transferred to booster type transformer T1 secondary, then
Rectified circuit 122 forms steady dc voltage so that the MOSFET in buffered power circuit 14 to be driven to turn on.Digital Signal Processing
Device 11 judges the value of main contactor both ends pressure difference and two terminal voltages according to the voltage that voltage sample circuit 13 samples, and above-mentioned
When pressure difference is respectively less than the first setting value less than the second setting value and two terminal voltages, stop sending height to driving chip 121 taking place frequently
Ripple, and after shut-off is completed in the Cgs electric discharges of MOSFET, closure signal is sent to main contactor.
During entirely buffering is powered on, whether digital signal processor 11 monitors main circuit voltage value in expection always
It is interior, once voltage be more than expected (two terminal voltages sampled are more than the first setting value) or power on buffer time it is long (
The pressure difference of sampling is more than the second setting value in setting time, i.e., after 11 output drive signal of digital signal processor, default
The voltage of sampling is not up to slow always in time opens the condition of completion), digital signal processor 11 will stop sending out to driving chip 121
Go out drive signal to stop buffering charging process.By this way, it can find out in time and buffering electricity is powered under various emergency cases
The overload problem on road so as to turn off buffer circuit rapidly, ensures security.
It may also include RC filter units in above-mentioned MOSFET driving circuits 12, and the RC filter units are connected to rectification circuit
122 output terminal.
The above-mentioned buffer circuit that powers on may be directly applied to electric vehicle motor control system, can effectively avoid existing electric car electricity
The problem of due to motor frequent start-stop snubber contact device being caused to damage in machine control system.Specifically, which controls
System includes digital signal processor, the main contactor for being connected to power system of electric automobile major loop, MOSFET driving circuits, voltage
Sample circuit and buffered power circuit.
Above-mentioned buffered power circuit includes power resistor and MOSFET, and the drain electrode of MOSFET is connected to via power resistor
One end of main contactor, source electrode are connected to the other end of the main contactor, grid is connected to the output of MOSFET driving circuits
End.Voltage sample circuit is used to sample the voltage at the main contactor both ends and by the voltage output of the sampling to digital signal
Processor.Digital signal processor is used to meet slow breakdown beginning condition in the voltage for receiving buffering and powering on instruction and the sampling
When, send drive signal driving MOSFET conductings to MOSFET driving circuits；Meet slow open in the voltage of the sampling and complete item
During part, stop sending drive signal to MOSFET driving circuits, and after the completion of the Cgs electric discharges of MOSFET, output makes main contact
The signal that device is closed.
Two terminal voltages and main contactor both ends of the voltage including main contactor of above-mentioned voltage sample circuit sampling
Pressure difference；Slow breakdown beginning condition is below the first setting value for two terminal voltages of sampling, and the pressure difference sampled is higher than the second setting
Value；The slow completion condition that opens is that two terminal voltages sampled in setting time are below the first setting value, and pressure difference sampled etc.
In or less than the second setting value.
Above-mentioned buffered power circuit may also include the power diode being serially connected between power resistor and MOSFET, to avoid
Master controller terminal voltage is poured in down a chimney.The anode of the power diode is connected to one end of main contactor via power resistor, cathode connects
It is connected to the drain electrode of MOSFET.
The drive signal that above-mentioned digital signal processor is sent to MOSFET driving circuits is the high frequency square wave of constant frequency,
MOSFET driving circuits include driving chip, capacitance, booster type transformer and rectification circuit, wherein：Driving chip is used for
High frequency square wave from digital signal processor is amplified, and the original of booster type transformer is connected to via capacitance
Side；The secondary of booster type transformer is connected to the input terminal of rectification circuit, and the output terminal of rectification circuit is connected to MOSFET's
Grid.To improve Output Voltage in Rectified Circuits quality, RC filters can be increased in the output terminal of the rectification circuit of MOSFET driving circuits
Ripple unit.
In above-mentioned electric vehicle motor control system, digital signal processor meets to delay in the voltage of sampling opens termination item
Stop sending drive signal to MOSFET during part, above-mentioned slow two terminal voltages for opening end condition as sampling are more than the first setting
Value or the pressure difference sampled in setting time are more than the second setting value, to prevent from powering on buffering overload, ensure system safety.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (8)
1. one kind powers on buffer circuit, it is characterised in that：Including digital signal processor, MOSFET driving circuits, voltage sampling
Circuit and buffered power circuit, wherein：
The buffered power circuit includes power resistor and MOSFET, and the drain electrode of the MOSFET is connected to via power resistor
Described in one end of the main contactor of high-pressure system major loop, source electrode are connected to the other end of the main contactor, grid is connected to
The output terminal of MOSFET driving circuits；
The voltage sample circuit, for the voltage that samples the main contactor both ends and by the voltage output of the sampling to number
Word signal processor；
The digital signal processor, for meeting slow breakdown beginning item in the voltage for receiving buffering and powering on instruction and the sampling
During part, drive signal driving MOSFET conductings are sent to MOSFET driving circuits；Meet to delay in the voltage of the sampling and open completion
During condition, stop sending drive signal to MOSFET driving circuits, and after the completion of the Cgs electric discharges of the MOSFET, output makes
The signal that main contactor is closed；
The voltage of the voltage sample circuit sampling includes two terminal voltages of main contactor and the pressure difference at main contactor both ends；
The slow breakdown beginning condition is below the first setting value for two terminal voltages of sampling, and the pressure difference of the sampling is set higher than second
Definite value；The slow completion condition that opens is that two terminal voltages sampled in setting time are below the first setting value, and described is adopted
The pressure difference of sample is equal to or less than the second setting value.
2. according to claim 1 power on buffer circuit, it is characterised in that：The buffered power circuit, which further includes, to be serially connected in
Power diode between power resistor and MOSFET, and the anode of the power diode is connected to main contact via power resistor
One end of device, cathode are connected to the drain electrode of MOSFET.
3. according to claim 1 power on buffer circuit, it is characterised in that：The digital signal processor drives to MOSFET
The drive signal that dynamic circuit is sent is the high frequency square wave of constant frequency, and the MOSFET driving circuits include driving chip, blocking
Capacitance, booster type transformer and rectification circuit, wherein：The driving chip is connected to booster type transformer via capacitance
Primary side, and for the high frequency square wave from digital signal processor to be amplified；The secondary connection of the booster type transformer
Output terminal to the input terminal of rectification circuit, and the rectification circuit is connected to the grid of MOSFET.
4. according to claim 1 power on buffer circuit, it is characterised in that：The digital signal processor is in the electricity of sampling
Pressure satisfaction, which is delayed, to be stopped sending drive signal to MOSFET when opening end condition, and slow open end condition to sample two hold electricity
It is more than the second setting value to press the pressure difference sampled more than the first setting value or in setting time.
5. a kind of electric vehicle motor control system, including digital signal processor, the master of power system of electric automobile major loop is connected to
Contactor, it is characterised in that：The control system further includes MOSFET driving circuits, voltage sample circuit and buffered power and returns
Road, wherein：
The buffered power circuit includes power resistor and MOSFET, and the drain electrode of the MOSFET is connected to via power resistor
One end of main contactor, source electrode are connected to the other end of the main contactor, grid is connected to the output of MOSFET driving circuits
End；
The voltage sample circuit, for the voltage that samples the main contactor both ends and by the voltage output of the sampling to number
Word signal processor；
The digital signal processor, for meeting slow breakdown beginning item in the voltage for receiving buffering and powering on instruction and the sampling
During part, drive signal driving MOSFET conductings are sent to MOSFET driving circuits；Meet to delay in the voltage of the sampling and open completion
During condition, stop sending drive signal to MOSFET driving circuits, and after the completion of the Cgs electric discharges of the MOSFET, output makes
The signal that main contactor is closed；
The voltage of the voltage sample circuit sampling includes two terminal voltages of main contactor and the pressure difference at main contactor both ends；
The slow breakdown beginning condition is below the first setting value for two terminal voltages of sampling, and the pressure difference of the sampling is set higher than second
Definite value；The slow completion condition that opens is that two terminal voltages sampled in setting time are below the first setting value, and described is adopted
The pressure difference of sample is equal to or less than the second setting value.
6. electric vehicle motor control system according to claim 5, it is characterised in that：The buffered power circuit further includes
The power diode being serially connected between power resistor and MOSFET, and the anode of the power diode is connected to via power resistor
One end of main contactor, cathode are connected to the drain electrode of MOSFET.
7. electric vehicle motor control system according to claim 5, it is characterised in that：The digital signal processor to
The drive signal that MOSFET driving circuits are sent is the high frequency square wave of constant frequency, and the MOSFET driving circuits include driving core
Piece, capacitance, booster type transformer and rectification circuit, wherein：The driving chip is connected to booster type via capacitance
The primary side of transformer, and for the high frequency square wave from digital signal processor to be amplified；The booster type transformer
Secondary is connected to the input terminal of rectification circuit, and the output terminal of the rectification circuit is connected to the grid of MOSFET.
8. electric vehicle motor control system according to claim 5, it is characterised in that：The digital signal processor is being adopted
The voltage of sample, which meets to delay, to be stopped sending drive signal to MOSFET when opening end condition, and the slow end condition that opens is the two of sampling
A terminal voltage is more than the first setting value or the pressure difference sampled in setting time is more than the second setting value.
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| CN201410682267.3A CN104378098B (en) | 2014-11-24 | 2014-11-24 | Power on buffer circuit and electric vehicle motor control system |
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| CN201410682267.3A CN104378098B (en) | 2014-11-24 | 2014-11-24 | Power on buffer circuit and electric vehicle motor control system |
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| CN110676806B (en) * | 2018-10-25 | 2021-09-17 | 长沙理工大学 | Overcurrent protection circuit of direct current electronic contactor |
| CN111200355B (en) * | 2018-11-19 | 2021-04-09 | 上海微电子装备（集团）股份有限公司 | Power-on buffer circuit |
| CN111817590B (en) * | 2020-07-23 | 2021-12-10 | 阳光电源股份有限公司 | Energy storage converter and method for detecting adhesion of slow-start switch of energy storage converter |
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| CN102170103A (en) * | 2011-03-24 | 2011-08-31 | 华为技术有限公司 | Electronic circuit breaker and processing method thereof |
| CN103199677A (en) * | 2013-04-08 | 2013-07-10 | 乐金电子研发中心(上海)有限公司 | One-way isolated type metal-oxide-semiconductor filed-effect transistor (MOSFET) drive circuit |
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| JP4482631B2 (en) * | 2004-02-20 | 2010-06-16 | 株式会社Ｅｍ研究機構 | Detergent applying fermentation technology and method for producing the same |
| CN103904620B (en) * | 2012-12-28 | 2018-09-14 | 南京中兴软件有限责任公司 | A kind of DC supply input counnter attack fills circuit and method |
| CN104035538B (en) * | 2013-03-05 | 2016-12-28 | 深圳市祈飞科技有限公司 | Mainboard protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170103A (en) * | 2011-03-24 | 2011-08-31 | 华为技术有限公司 | Electronic circuit breaker and processing method thereof |
| CN103199677A (en) * | 2013-04-08 | 2013-07-10 | 乐金电子研发中心(上海)有限公司 | One-way isolated type metal-oxide-semiconductor filed-effect transistor (MOSFET) drive circuit |
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Effective date of registration: 20220815 Address after: Room 1801, 1901, Unit 1, Huichuan Technology Headquarters Building, No. 6 Lanqing 2nd Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen, Guangdong 518000 Patentee after: Huichuan New Energy Vehicle Technology (Shenzhen) Co., Ltd. Address before: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |