CN104378098A - Electrifying buffer circuit and electrombile motor control system - Google Patents
Electrifying buffer circuit and electrombile motor control system Download PDFInfo
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- CN104378098A CN104378098A CN201410682267.3A CN201410682267A CN104378098A CN 104378098 A CN104378098 A CN 104378098A CN 201410682267 A CN201410682267 A CN 201410682267A CN 104378098 A CN104378098 A CN 104378098A
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Abstract
The invention provides an electrifying buffer circuit and an electrombile motor control system. The electrifying buffer circuit comprises a digital signal processor, an MOSFET drive circuit, a voltage sampling circuit and a buffer power loop. The buffer power loop comprises a power resistor and an MOSFET. The voltage sampling circuit is used for sampling the voltage across the two ends of a main contactor. The digital signal processer is used for sending drive signals to the MOSFET drive circuit to drive the MOSFET to be connected when a buffer electrifying instruction is received and the sampled voltage meets the buffer start starting conditions; when the sampled voltage meets the buffer start finishing conditions, the digital signal processer stops sending the drive signals to the MOSFET drive circuit, and after a Cgs of the MOSFET finishes discharging, signals enabling the main contactor to be closed are output. According to the electrifying buffer circuit and the electrombile motor control system, through the strong overload capacity of the MOSFET, a buffer contactor can be effectively replaced to achieve fast electrifying of capacitive load of a main loop of an electrombile power system.
Description
Technical field
The present invention relates to Motor Control Field, more particularly, relate to one and to power on buffer circuit and electric vehicle motor control system.
Background technology
Through the development in more than ten years, from small to large, formed an industrial colony in large scale, after especially entering 21st century, whole industry presents high speed development situation to Chinese electric motor car industry.
In the electric machine control system of current most domestic electric motor car, all need at dynamical system major loop series connection main contactor to ensure system safety, meanwhile, Electric Machine Control also needs at dynamical system major loop large bulk capacitance in parallel to provide enough ripple currents.In order to overcome the impulse current that capacitive load produces when High Pressure Difference, usually the snubber contact device that powers on is adopted to be connected in parallel on main contactor two ends, to avoid main contactor adhesion.
Such scheme structure is simple, but there is the high problem of design cost.And compared with other variable frequency control system of motors former, there is the features such as start and stop are frequent in electric motor car, and snubber contact device belongs to rapid wear device, makes system reliability greatly reduce.Volume is increasing along with the rising of dynamical system major loop busbar voltage for simultaneous buffering contactor, and this will cause product power density lower.
Summary of the invention
The technical problem to be solved in the present invention is, to power on the problem that buffer structure reliability is low, power density is lower for above-mentioned electric machine control system, provides one to power on buffer circuit and electric vehicle motor control system.
The technical scheme that the present invention solves the problems of the technologies described above is, provides one to power on buffer circuit, comprises digital signal processor, MOSFET drive circuit, voltage sample circuit and buffered power loop, wherein:
Described buffered power loop comprises power resistor and MOSFET, and the other end that the drain electrode of described MOSFET is connected to one end of the main contactor of high pressure major loop via power resistor, source electrode is connected to described main contactor, grid are connected to the output of described MOSFET drive circuit;
Described voltage sample circuit, for described main contactor two ends of sampling voltage and the voltage of described sampling is outputted to digital signal processor;
Described digital signal processor, for receive buffering power on instruction and the voltage of described sampling meet slow breakdown beginning condition time, send drive singal driven MOS FET conducting to MOSFET drive circuit; The voltage of described sampling meet slow opened condition time, stop sending drive singal to MOSFET drive circuit, and after the Cgs of described MOSFET discharge, export the signal that main contactor is closed.
Power in buffer circuit of the present invention, the voltage of described voltage sample circuit sampling comprises two terminal voltages of main contactor and the pressure reduction at main contactor two ends; Described slow breakdown beginning condition be two terminal voltages of sampling all lower than the first set point, and the pressure reduction of described sampling is higher than the second set point; Described slow opened condition be two terminal voltages of sampling in setting-up time all lower than the first set point, and the pressure reduction of described sampling is equal to or less than the second set point.
Power in buffer circuit of the present invention, described buffered power loop also comprises the power diode be serially connected between power resistor and MOSFET, and the anode of this power diode is via the drain electrode that power resistor is connected to one end of main contactor, negative electrode is connected to MOSFET.
Power in buffer circuit of the present invention, described digital signal processor is the high frequency square wave of constant frequency to the drive singal that MOSFET drive circuit sends, described MOSFET drive circuit comprises driving chip, capacitance, booster type transformer and rectification circuit, wherein: described driving chip is connected to the former limit of booster type transformer via capacitance, and for the high frequency square wave from digital signal processor is amplified; The secondary of described booster type transformer is connected to the input of rectification circuit, and the output of described rectification circuit is connected to the grid of MOSFET.
Power in buffer circuit of the present invention, described digital signal processor stops when the voltage of sampling meets and delays and open end condition sending drive singal to MOSFET, described slow open end condition be two terminal voltages of sampling more than the first set point, or the pressure reduction of sampling in setting-up time is more than the second set point.
The present invention also provides a kind of electric vehicle motor control system, and comprise digital signal processor, be connected to the main contactor of power system of electric automobile major loop, described control system also comprises MOSFET drive circuit, voltage sample circuit and buffered power loop, wherein:
Described buffered power loop comprises power resistor and MOSFET, and the drain electrode of described MOSFET is connected to the output of MOSFET drive circuit via the other end that power resistor is connected to one end of main contactor, source electrode is connected to described main contactor, grid;
Described voltage sample circuit, for described main contactor two ends of sampling voltage and the voltage of described sampling is outputted to digital signal processor;
Described digital signal processor, for receive buffering power on instruction and the voltage of described sampling meet slow breakdown beginning condition time, send drive singal driven MOS FET conducting to MOSFET drive circuit; The voltage of described sampling meet slow opened condition time, stop sending drive singal to MOSFET drive circuit, and after the Cgs of described MOSFET discharge, export the signal that main contactor is closed.
In electric vehicle motor control system of the present invention, the voltage of described voltage sample circuit sampling comprises two terminal voltages of main contactor and the pressure reduction at main contactor two ends; Described slow breakdown beginning condition be two terminal voltages of sampling all lower than the first set point, and the pressure reduction of described sampling is higher than the second set point; Described slow opened condition be two terminal voltages of sampling in setting-up time all lower than the first set point, and the pressure reduction of described sampling is equal to or less than the second set point.
In electric vehicle motor control system of the present invention, described buffered power loop also comprises the power diode be serially connected between power resistor and MOSFET, and the anode of this power diode is via the drain electrode that power resistor is connected to one end of main contactor, negative electrode is connected to MOSFET.
In electric vehicle motor control system of the present invention, described digital signal processor is the high frequency square wave of constant frequency to the drive singal that MOSFET drive circuit sends, described MOSFET drive circuit comprises driving chip, capacitance, booster type transformer and rectification circuit, wherein: described driving chip is connected to the former limit of booster type transformer via capacitance, with and in the high frequency square wave from digital signal processor is amplified; The secondary of described booster type transformer is connected to the input of rectification circuit, and the output of described rectification circuit is connected to the grid of MOSFET.
In electric vehicle motor control system of the present invention, described digital signal processor stops when the voltage of sampling meets and delays and open end condition sending drive singal to MOSFET, described slow open end condition be two terminal voltages of sampling more than the first set point, or the pressure reduction of sampling in setting-up time is more than the second set point.
Buffer circuit and the electric vehicle motor control system of powering on of the present invention, utilizes the strong overload capacity of MOSFET, can effectively replace snubber contact device to realize the capacitive load fast powering-up of power system of electric automobile major loop.Further, because MOSFET has, volume is little, overcurrent capability strong, and the present invention significantly can improve the power density of electric machine control system.
Accompanying drawing explanation
Fig. 1 is that the present invention powers on the schematic diagram of buffer circuit embodiment.
Fig. 2 is that the present invention powers on the schematic diagram of another embodiment of buffer circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, be that the present invention powers on the schematic diagram of buffer circuit embodiment, it can realize the fast powering-up of the capacitive load of electric vehicle control system etc.The buffer circuit that powers in the present embodiment comprises digital signal processor 11, MOSFET drive circuit 12, voltage sample circuit 13 and buffered power loop 14, and digital signal processor 11, MOSFET drive circuit 12 and buffered power loop 14 connect successively, the input of voltage sample circuit 13 is connected to high-pressure system major loop, the DC bus of such as power system of electric automobile.The main contactor of the fail safe for ensureing system is serially connected with in above-mentioned high-pressure system major loop; Also be parallel with the large bulk capacitance for providing enough ripple current in this high-pressure system major loop simultaneously.
Buffered power loop 14 comprises power resistor R1 and MOSFET, and the other end (i.e. DC bus BUS2+) that the drain electrode of this MOSFET is connected to one end (i.e. DC bus BUS1+) of the main contactor of high pressure major loop via power resistor R1, source electrode is connected to main contactor, grid are connected to the output of MOSFET drive circuit 12.Above-mentioned power resistor R1 can play the effect of restriction buffer current, avoids large impulse current to damage MOSFET.
Voltage sample circuit 13 for main contactor two ends of sampling voltage and the voltage of sampling is outputted to digital signal processor 11.Optocoupler, amplifier modulate circuit etc. can be adopted to carry out voltage sample for this voltage sample circuit 13 and sampled signal exports.
Digital signal processor 11 for receive buffering power on instruction (such as from outside input) and the voltage of sampling meet slow breakdown beginning condition time, send drive singal with driven MOS FET conducting to MOSFET drive circuit 12; Continue to send in drive singal process to MOSFET drive circuit 12 at digital signal processor 11, if the voltage of sampling meets to delay opened condition, then digital signal processor 11 stops sending drive singal to MOSFET drive circuit 12, and after the Cgs of MOSFET has discharged, export the signal making main contactor closed.
The above-mentioned buffer circuit that powers on utilizes the strong overload capacity of MOSFET, can effectively replace snubber contact device to realize the capacitive load fast powering-up of power system of electric automobile major loop.Further, because MOSFET has, volume is little, overcurrent capability strong, significantly can improve the power density of electric machine control system.
Especially, the voltage that above-mentioned voltage sample circuit 13 is sampled comprises two terminal voltages of main contactor and the pressure reduction at main contactor two ends; Slow breakdown beginning condition be two terminal voltages of sampling all lower than the first set point (i.e. overvoltage protection voltage), and the pressure reduction of sampling is higher than the second set point; Slow opened condition be two terminal voltages of sampling in setting-up time all lower than the first set point (i.e. overvoltage protection voltage), and the pressure reduction of sampling is equal to or less than the second set point.
Pour in down a chimney to BUS1+ for avoiding main contactor BUS2+ terminal voltage in high pressure major loop and hold, above-mentioned buffered power loop 14 also can comprise the power diode D be serially connected between power resistor R1 and MOSFET, and the anode of this power diode D is connected to via power resistor R1 the drain electrode that main contactor BUS1+ holds, negative electrode is connected to MOSFET.
As shown in Figure 2, power in another embodiment of buffer circuit in electric vehicle motor control system of the present invention, the drive singal that digital signal processor 11 sends to MOSFET drive circuit 12 is the high frequency square wave of constant frequency, and MOSFET drive circuit 12 specifically comprises driving chip 121, capacitance C1, booster type transformer T and rectification circuit 122.
The drive singal output of the input linking number word signal processor 11 of above-mentioned driving chip 121, and for the high frequency square wave from digital signal processor 11 is amplified.The output of this driving chip 121 is connected to the former limit of booster type transformer T through capacitance C1.The secondary of booster type transformer T is connected to the input of rectification circuit 122, and the output of rectification circuit 122 is connected to the grid of MOSFET.
When high-pressure system control circuit completes power-on self-test, digital signal processor 11 is after confirming that voltage that voltage sample circuit 13 is sampled meets buffering beginning condition, and response buffering powers on instruction, sends the high frequency square wave of constant frequency.This high frequency square wave amplifies through driving chip 121, then forms positive and negative square wave via capacitance C1, is passed to booster type transformer T1 secondary, then forms galvanic current pressure to drive the MOSFET conducting in buffered power loop 14 through rectification circuit 122.Digital signal processor 11 judges the value of main contactor two ends pressure reduction and two terminal voltages according to the voltage that voltage sample circuit 13 is sampled, and above-mentioned pressure reduction lower than the second set point and two terminal voltages are all less than the first set point time, stop sending the high ripple that takes place frequently to driving chip 121, and have no progeny in the Cgs of MOSFET pass of having discharged, send closure signal to main contactor.
Power between phase buffer whole, digital signal processor 11 monitors main circuit voltage value whether within expection always, once voltage exceedes expection (two terminal voltages of namely sampling are more than the first set point) or the buffer time that powers on, long (pressure reduction of sampling in setting-up time is more than the second set point, namely after digital signal processor 11 output drive signal, the voltage of sampling in Preset Time does not reach slow all the time and has opened condition), stopping is sent drive singal to stop cushioning charging process to driving chip 121 by digital signal processor 11.By which, the overload problem of the buffer circuit that powers under can finding out various emergency case in time, thus turn off buffer circuit rapidly, ensure fail safe.
In above-mentioned MOSFET drive circuit 12, also can comprise RC filter unit, and this RC filter unit is connected to the output of rectification circuit 122.
The above-mentioned buffer circuit that powers on can directly apply to electric vehicle motor control system, can effectively avoid causing because of motor frequent start-stop the problem that snubber contact device damages in existing electric vehicle motor control system.Particularly, this electric vehicle motor control system comprises digital signal processor, is connected to the main contactor of power system of electric automobile major loop, MOSFET drive circuit, voltage sample circuit and buffered power loop.
Above-mentioned buffered power loop comprises power resistor and MOSFET, and the drain electrode of MOSFET is connected to the output of MOSFET drive circuit via the other end that power resistor is connected to one end of main contactor, source electrode is connected to described main contactor, grid.Voltage sample circuit for described main contactor two ends of sampling voltage and the voltage of described sampling is outputted to digital signal processor.Digital signal processor be used for receive buffering power on instruction and the voltage of described sampling meet slow breakdown beginning condition time, send drive singal driven MOS FET conducting to MOSFET drive circuit; The voltage of described sampling meet slow opened condition time, stop sending drive singal to MOSFET drive circuit, and after the Cgs of MOSFET discharge, export the signal that main contactor is closed.
The voltage of above-mentioned voltage sample circuit sampling comprises two terminal voltages of main contactor and the pressure reduction at main contactor two ends; Slow breakdown beginning condition be two terminal voltages of sampling all lower than the first set point, and the pressure reduction of sampling is higher than the second set point; Slow opened condition be two terminal voltages of sampling in setting-up time all lower than the first set point, and the pressure reduction of sampling is equal to or less than the second set point.
Above-mentioned buffered power loop also can comprise the power diode be serially connected between power resistor and MOSFET, pours in down a chimney to avoid master controller terminal voltage.The anode of this power diode is via the drain electrode that power resistor is connected to one end of main contactor, negative electrode is connected to MOSFET.
Above-mentioned digital signal processor is the high frequency square wave of constant frequency to the drive singal that MOSFET drive circuit sends, MOSFET drive circuit comprises driving chip, capacitance, booster type transformer and rectification circuit, wherein: driving chip is used for the high frequency square wave from digital signal processor to amplify, and is connected to the former limit of booster type transformer via capacitance; The secondary of booster type transformer is connected to the input of rectification circuit, and the output of rectification circuit is connected to the grid of MOSFET.For improving Output Voltage in Rectified Circuits quality, RC filter unit can be increased at the output of the rectification circuit of MOSFET drive circuit.
In above-mentioned electric vehicle motor control system, digital signal processor stops when the voltage of sampling meets and delays and open end condition sending drive singal to MOSFET, the above-mentioned slow end condition that opens is that two terminal voltages of sampling are more than the first set point, or the pressure reduction of sampling in setting-up time is more than the second set point, to prevent the buffering overload that powers on, ensure system safety.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. power on a buffer circuit, it is characterized in that: comprise digital signal processor, MOSFET drive circuit, voltage sample circuit and buffered power loop, wherein:
Described buffered power loop comprises power resistor and MOSFET, and the other end that the drain electrode of described MOSFET is connected to one end of the main contactor of high-pressure system major loop via power resistor, source electrode is connected to described main contactor, grid are connected to the output of described MOSFET drive circuit;
Described voltage sample circuit, for described main contactor two ends of sampling voltage and the voltage of described sampling is outputted to digital signal processor;
Described digital signal processor, for receive buffering power on instruction and the voltage of described sampling meet slow breakdown beginning condition time, send drive singal driven MOS FET conducting to MOSFET drive circuit; The voltage of described sampling meet slow opened condition time, stop sending drive singal to MOSFET drive circuit, and after the Cgs of described MOSFET discharge, export the signal that main contactor is closed.
2. the buffer circuit that powers on according to claim 1, is characterized in that: the voltage of described voltage sample circuit sampling comprises two terminal voltages of main contactor and the pressure reduction at main contactor two ends; Described slow breakdown beginning condition be two terminal voltages of sampling all lower than the first set point, and the pressure reduction of described sampling is higher than the second set point; Described slow opened condition be two terminal voltages of sampling in setting-up time all lower than the first set point, and the pressure reduction of described sampling is equal to or less than the second set point.
3. the buffer circuit that powers on according to claim 1 and 2, it is characterized in that: described buffered power loop also comprises the power diode be serially connected between power resistor and MOSFET, and the anode of this power diode is via the drain electrode that power resistor is connected to one end of main contactor, negative electrode is connected to MOSFET.
4. the buffer circuit that powers on according to claim 1 and 2, it is characterized in that: described digital signal processor is the high frequency square wave of constant frequency to the drive singal that MOSFET drive circuit sends, described MOSFET drive circuit comprises driving chip, capacitance, booster type transformer and rectification circuit, wherein: described driving chip is connected to the former limit of booster type transformer via capacitance, and for the high frequency square wave from digital signal processor is amplified; The secondary of described booster type transformer is connected to the input of rectification circuit, and the output of described rectification circuit is connected to the grid of MOSFET.
5. the buffer circuit that powers on according to claim 2, it is characterized in that: described digital signal processor stops when the voltage of sampling meets and delays and open end condition sending drive singal to MOSFET, described slow open end condition be two terminal voltages of sampling more than the first set point, or the pressure reduction of sampling in setting-up time is more than the second set point.
6. an electric vehicle motor control system, comprise digital signal processor, be connected to the main contactor of power system of electric automobile major loop, it is characterized in that: described control system also comprises MOSFET drive circuit, voltage sample circuit and buffered power loop, wherein:
Described buffered power loop comprises power resistor and MOSFET, and the drain electrode of described MOSFET is connected to the output of MOSFET drive circuit via the other end that power resistor is connected to one end of main contactor, source electrode is connected to described main contactor, grid;
Described voltage sample circuit, for described main contactor two ends of sampling voltage and the voltage of described sampling is outputted to digital signal processor;
Described digital signal processor, for receive buffering power on instruction and the voltage of described sampling meet slow breakdown beginning condition time, send drive singal driven MOS FET conducting to MOSFET drive circuit; The voltage of described sampling meet slow opened condition time, stop sending drive singal to MOSFET drive circuit, and after the Cgs of described MOSFET discharge, export the signal that main contactor is closed.
7. electric vehicle motor control system according to claim 6, is characterized in that: the voltage of described voltage sample circuit sampling comprises two terminal voltages of main contactor and the pressure reduction at main contactor two ends; Described slow breakdown beginning condition be two terminal voltages of sampling all lower than the first set point, and the pressure reduction of described sampling is higher than the second set point; Described slow opened condition be two terminal voltages of sampling in setting-up time all lower than the first set point, and the pressure reduction of described sampling is equal to or less than the second set point.
8. the electric vehicle motor control system according to claim 6 or 7, it is characterized in that: described buffered power loop also comprises the power diode be serially connected between power resistor and MOSFET, and the anode of this power diode is via the drain electrode that power resistor is connected to one end of main contactor, negative electrode is connected to MOSFET.
9. the electric vehicle motor control system according to claim 6 or 7, it is characterized in that: described digital signal processor is the high frequency square wave of constant frequency to the drive singal that MOSFET drive circuit sends, described MOSFET drive circuit comprises driving chip, capacitance, booster type transformer and rectification circuit, wherein: described driving chip is connected to the former limit of booster type transformer via capacitance, and for the high frequency square wave from digital signal processor is amplified; The secondary of described booster type transformer is connected to the input of rectification circuit, and the output of described rectification circuit is connected to the grid of MOSFET.
10. electric vehicle motor control system according to claim 7, it is characterized in that: described digital signal processor stops when the voltage of sampling meets and delays and open end condition sending drive singal to MOSFET, described slow open end condition be two terminal voltages of sampling more than the first set point, or the pressure reduction of sampling in setting-up time is more than the second set point.
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| CN110676806A (en) * | 2018-10-25 | 2020-01-10 | 长沙理工大学 | Overcurrent protection circuit of direct current electronic contactor |
| CN111200355A (en) * | 2018-11-19 | 2020-05-26 | 上海微电子装备（集团）股份有限公司 | Power-on buffer circuit |
| CN111817590A (en) * | 2020-07-23 | 2020-10-23 | 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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| CN104378098B (en) | 2018-05-22 |
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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. |
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