CN101091304A - Motor control unit and vehicle equipped therewith - Google Patents
Motor control unit and vehicle equipped therewith Download PDFInfo
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- CN101091304A CN101091304A CNA2005800451842A CN200580045184A CN101091304A CN 101091304 A CN101091304 A CN 101091304A CN A2005800451842 A CNA2005800451842 A CN A2005800451842A CN 200580045184 A CN200580045184 A CN 200580045184A CN 101091304 A CN101091304 A CN 101091304A
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Abstract
A motor control unit and a vehicle equipped with the unit according to the invention includes a control unit that selects a switching frequency, that is, a carrier frequency, in accordance with a rotation speed of the motor and a torque required from a motor. When an inverter temperature becomes high, the control unit limits the torque of the motor to suppress further increase in the inverter temperature. A limit value used in restricted operation is determined in accordance with the temperature and the carrier frequency of the inverter.
Description
Technical field
The present invention relates to a kind of motor control unit and the vehicle that has assembled described motor control unit.
Background technology
Driving control system for electric machine has all been used in each field, therein, drives motor by inverter.In such system, the inverter circuit of drive motors comprises the switching device such as IGBT device, power MOS (Metal Oxide Semiconductor) device etc.Because these switching devices may be damaged by high temperature, when the temperature of described inverter raises, common torque-limiting.
Japanese Patent Application JP-A-9-121595 has described a kind of temperature barrier that is used for power converter, and is very high even the temperature of the switching device of inverter circuit becomes, and it also can carry out the heat protection to this switching device, and does not reduce torque.
When the detected temperature of described switching device raises, in the thermal protection that described device is controlled, at first, high carrier frequency is switched to low carrier frequency, and torque-limiting not.Then, if temperature still continues to raise, described device is less value with torque limit.
Another kind of correlation technique has been described among the Japanese Patent Application JP-A-7-322401.
Recently, be subjected to extensive concern such as environment-friendly type vehicles such as electric motor car, hybrid vehicle, fuel-cell vehicles.The vehicle of these types has assembled the motor that is driven by DC power supply and inverter.Described motor is that vehicle produces driving torque.
Yet for the needs of the installing space of the inverter that reduces cost and drive motors, trend is the littler inverter of low heat capacity more.If use such inverter, because heat is concentrated, will the unexpected rising of temperature appear probably.In the high carrier frequency of frequently carrying out switch, this temperature raises especially obvious.
Notice based on rotating speed of motor and needed torque carrier frequency fc is set, this carrier frequency fc determines described switching frequency.
Fig. 5 A and 5B are conceptual illustration, and it has illustrated described carrier frequency.
Fig. 5 A shows the situation that carrier frequency fc is 1.25kHz.This carrier frequency is used as the basis of the PWM control of ON/OFF waveform, thereby causes electric current I COIL to flow.
On the other hand, Fig. 5 B shows the higher situation of frequency ratio Fig. 5 A of electric current I COIL.In this case, carrier frequency fc need be increased to 2.5kHz, so that electric current I COIL smooth flow.On this carrier frequency, carry out PWM control, thereby open or close described switching device.
By reducing described carrier frequency rather than torque-limiting, can reduce the number of times of handover operation.Therefore, can reduce switching loss, raise thereby suppress temperature, the amount of this inhibition is corresponding to the minimizing of switching loss.Yet, must not make that like this motor steadily rotates, thereby may increase the vibration of motor.
The temperature that Fig. 6 has illustrated described carrier frequency and switching device raises.
It is 65 ℃ situation that Fig. 6 shows initial temperature.In this case, when carrier frequency fc is 1.25kHz or fc when being 2.5kHz, even prolong the machine operation time, the temperature of described switching device also can't be elevated to 110 ℃, and this temperature is that switching device can impaired temperature.
On the other hand, when carrier frequency was 5kHz, described switching loss became greater to the higher degree of switching frequency, and described switching loss produces heat.Therefore, if be that 1.25kHz or fc are that temperature may be above 110 ℃ after the moment t1 when initial temperature was 65 ℃ under the situation of 2.5kHz at carrier frequency fc.So, when carrier frequency is higher, unless take some countermeasures, device will be damaged.
Summary of the invention
The object of the present invention is to provide a kind of motor control unit and the vehicle that has assembled described unit, this element can farthest produce needed torque, and suppresses the temperature rising of switching device simultaneously.
Motor control unit according to aspects of the present invention comprises: the drive circuit of drive motors, this motor produce torque to obtain the actuating force of vehicle; And the control section of controlling described drive circuit.Described control section utilizes limits value to control described drive circuit, thereby makes described motor carry out limited operation.Determine described limits value according to the switching frequency of the switching device that in described drive circuit, comprises and the temperature of this switching device.
In according to the motor control unit aspect of the present invention, described control section can be by selecting described switching frequency to control described drive circuit according to described rotating speed of motor with from the torque that described motor obtains.
In according to the motor control unit aspect of the present invention, can determine described limits value based on torque limit value.Can pre-determine described torque limit value according to the switching frequency and the temperature of described switching device.
Further, in according to the motor control unit aspect of the present invention, although, determine described limits value based on switching frequency and the predetermined described torque limit value of temperature according to described switching device when described rotating speed of motor increase when scheduled volume but described switching frequency do not increase at least.And,, when described switching frequency also increases, can determine described limits value based on switching frequency that has increased and the predetermined torque limit value of temperature according to described switching device when along with the described at least scheduled volume of described rotating speed of motor increase.
The vehicle of aspect according to the present invention comprises: motor, and it produces torque to obtain the actuating force of described vehicle; And motor control unit, it controls described motor.Described motor control unit comprises the drive circuit that is used to drive described motor, and the control section that is used to control described drive circuit.Described control section utilizes limits value to control described drive circuit, thereby makes described motor carry out limited operation.Determine described limits value according to the switching frequency of the switching device that in described drive circuit, comprises and the temperature of described switching device.
In according to the vehicle aspect of the present invention, described control section can be by selecting described switching frequency to control described drive circuit according to described rotating speed of motor with from the torque that this motor obtains.
In according to the vehicle aspect of the present invention, can determine described limits value based on torque limit value, and can pre-determine described torque limit value according to the switching frequency and the temperature of described switching device.
In according to the vehicle aspect of the present invention, although, determine described limits value based on switching frequency and the predetermined described torque limit value of temperature according to described switching device when described rotating speed of motor increase when scheduled volume but described switching frequency do not increase at least.And, when along with the described at least scheduled volume of described rotating speed of motor increase, when described switching frequency also increases, can determine described limits value based on switching frequency and the predetermined torque limit value of temperature according to the higher prediction of the current switching frequency of the ratio of described switching device.
Aspect according to the present invention at described motor control unit and having assembled in the vehicle of this unit, can farthest produce needed torque, and simultaneously can the protection switch device.
Description of drawings
From below with reference to the accompanying drawing description of preferred embodiments, aforementioned and/or further purpose of the present invention, feature and advantage will become more obvious, in described accompanying drawing, represent identical or corresponding part with identical reference number, wherein:
Fig. 1 is a circuit diagram, and it illustrates the structure that has assembled according to the vehicle 100 of motor control unit of the present invention;
Fig. 2 is a flow chart, and it has illustrated the control flow of the control unit 30 among Fig. 1;
Fig. 3 is a diagrammatic sketch, and it has illustrated carrier frequency fc;
Fig. 4 is a diagrammatic sketch, the torque limit map of using among step S4, S6 that it has been illustrated at Fig. 2 and the S8;
Fig. 5 A and 5B are conceptual diagram, and it has illustrated described carrier frequency; And
Fig. 6 is a diagrammatic sketch, and it has illustrated described carrier frequency and temperature raises.
Embodiment
After this, will be described in detail with reference to the attached drawings embodiments of the invention.Notice, utilize identical reference number to represent identical or corresponding part, and the descriptions thereof are omitted.
Fig. 1 is a circuit diagram, and it illustrates the structure of the vehicle 100 that has assembled motor control unit of the present invention.
Battery B is the secondary cell such as Ni-MH battery, lithium ion battery etc.Voltage sensor 10 detects from direct current (DC) the voltage VB of battery B output, and reflects the signal of the dc voltage that is detected to control unit 30 outputs.Open or shutdown system main relay SR1, SR2 by signal SE from control unit 30.More specifically, when signal SE is high level (logic high), open system main relay SR1, SR2, and when signal SE is low level (logic low), it is closed.When system main relay SR1, SR2 open, the voltage between the terminal of the level and smooth battery B of capacitor C1.
The other end of reactor L1 is connected to the emitter of IGBT device Q1 and the collector electrode of IGBT device Q2.The negative electrode of diode D1 is connected to the collector electrode of IGBT device Q1, and the anode of diode D1 is connected to the emitter of IGBT device Q1 simultaneously.The negative electrode of diode D2 is connected to the collector electrode of IGBT device Q2, and the anode of diode D2 is connected to the emitter of IGBT device Q2 simultaneously.
AC motor M 1 is the motor of torque that is used for producing the driving wheel (not shown) of powered vehicle 100.For example, this motor is applicable to hybrid vehicle.More specifically, this motor can be used as the generator that is driven by the engine (not shown), and also can be used as the motor that is used for described engine, and it can start described engine.
The intermediate point of each phase arm 15,16,17 is connected to the end separately of U phase, V phase and the W phase coil of AC motor M 1.AC motor M 1 is a three-phase motor with permanent magnets, and wherein, the mid point of an end between them of each in three coils is connected to other coil.The other end of U phase coil is connected to the link node of IGBT device Q3, Q4.The other end of V phase coil is connected to the link node of IGBT device Q5, Q6.The other end of W phase coil is connected to the link node of IGBT device Q7, Q8.
Next, with the operation of brief explanation electric pressure converter 20.Boost converter 12 in the electric pressure converter 20 when powered operation, carries out work as booster circuit, and it will offer inverter 14 from the electric power of battery B as forward conversion circuit.On the contrary, in regenerative operation, boost converter 12 is as reduction voltage circuit work, and it is as the reverse conversion circuit, and the electric power that generates with motor M1 charges to battery B.
When IGBT device Q1 closed, by switch I GBT device Q2, boost converter 12 was as booster circuit work.More specifically, when IGBT device Q2 opened, electric current was along via reactor L1 and the IGBT device Q2 path flow from the positive pole of battery B to the negative pole of battery B.When electric current flowed, energy was stored among the reactor L1.
When IGBT device Q2 closed, the energy that is stored among the reactor L1 flowed to inverter 14 via diode D1.As a result, the voltage between the electrode of capacitor C2 increases.So the output voltage that affacts the boost converter 12 of inverter 14 is raised.
On the other hand, when IGBT device Q2 closed, by switch I GBT device Q1, boost converter 12 was as reduction voltage circuit work.More specifically, when IGBT device Q1 opened, the regenerative current that returns via inverter 14 passed through IGBT device Q1 and reactor L1, flows to battery B.
Further, when IGBT device Q1 closes, form the loop that comprises reactor L1, battery B and diode D2, and charge to battery B with the energy of storing among the reactor L1.In this inverse conversion, the time that inverter 14 provides the time ratio battery B of electric power to receive electric power is longer.Therefore, the voltage of inverter 14 reduces, and charges to battery B.Suitably control the operation of electric pressure converter 20 by the switching between powered operation and regenerative operation.
Should be noted that, when the driver when stepping on the foot brake abrupt deceleration vehicle, described regeneration control comprises the regenerative electric power in hybrid vehicle or the electric motor car.Described regeneration control also comprises when release the accelerator pedal vehicle deceleration or the regenerative electric power when stopping to quicken, even do not step on foot brake at this moment.
If the inverter temperature T uprises, the torque of control unit 30 restriction motor M 1, thus make the temperature of inverter 14 no longer raise.Determine the limits value of described torque based on inverter temperature T and carrier frequency fc.
Fig. 2 is a flow chart, and it has illustrated the control flow of the control unit 30 among Fig. 1.
At first, at step S1, control unit 30 reads by temperature sensor 35 detected inverter temperature T.
Then, control unit 30 reads current carrier frequency fc at step S2.
Below with reference to Fig. 3 carrier frequency fc is described.
In Fig. 3, the rotational speed N of trunnion axis indication motor M1, and the torque that vertical axis indication motor M1 needs.Rotational speed N equal or zone within the W1 of boundary line in, that is, comprise the zone of an A, carrier frequency fc is set to 1.25kHz.
Zone between boundary line W1 and W2 promptly, comprises the zone of a B, and carrier frequency fc is set to 2.5kHz.Zone between boundary line W2 and W3 promptly, comprises the zone of a C, and described carrier frequency is set to 5kHz.
At step S3, determine whether carrier frequency fc is 1.25kHz.If carrier frequency fc is 1.25kHz, then handles and proceed to step S4.If not, then handle and proceed to step S5.
At step S4, control unit 30 reads the torque limit map of the carrier frequency fc of 1.25kHz.Then, processing proceeds to step S9.
At step S5, determine whether carrier frequency fc is 2.5kHz.If carrier frequency fc is 2.5kHz, then handles and proceed to step S6.If not, then handle and proceed to step S7.
At step S6, control unit 30 reads the torque limit map of the carrier frequency fc of 2.5kHz.After completing steps S6, handle proceeding to step S9.
At step S7, determine whether carrier frequency fc is 5kHz.If carrier frequency fc is 5kHz, then handle and proceed to step S8, in this step, control unit 30 reads the torque limit map of the carrier frequency fc of 5kHz.
Notice that even carrier frequency fc is not 5kHz, processing will proceed to step S8.Why carrying out processing by this way is because the torque limit map of the carrier frequency of 5kHz is the strictest map.Can change described flow process, thereby make described processing be directly to step S8, and not carry out determining of step S7.
At step S8, control unit 30 reads the torque limit map of the carrier frequency of 5kHz.Then, processing proceeds to step S9.At step S9, control unit 30 usefulness are come control inverter 14 by the torque of determined torque limit value restriction, with electric rotating machine.
Then, described processing proceeds to step S10 from step S9, finishes in this step process.
The torque limit map of using among step S4, S6 that Fig. 4 has illustrated at Fig. 2 and the S8.
In Fig. 4, trunnion axis is indicated by the 35 detected inverter temperature T of the temperature sensor among Fig. 1.Vertical axis command torque limits value, it is the condition of the driving of control motor M 1.
As shown in Figure 4, pre-determine described torque limit value according to carrier frequency fc with the inverter temperature T that is equal to the switching device temperature.
When carrier frequency fc is 1.25kHz, torque-limiting not during reality drives.The pre-determined torque of selection 100% is as the torque limit value in each temperature range.
When carrier frequency fc is 2.5KHz,,, described torque is applied bigger restriction along with temperature uprises if the inverter temperature T is equal to or higher than T2.In other words, described torque limit value becomes littler.
When carrier frequency fc is 5kHz, if being lower than T2, the inverter temperature T but is not less than T1, along with temperature uprises, described torque limit value is set to littler.
As shown in Figure 6, for example, when initial temperature is that 65 ℃ and described carrier frequency fc are 1.25kHz or fc when being 2.5kHz, even prolong the motor operation time, temperature can not be elevated to 110 ℃ yet, and this temperature is that switching device is with impaired temperature.
On the other hand, when carrier frequency was 5kHz, switching loss became greater to the degree that makes that switching frequency is higher, and switching loss produces heat.Therefore, if be that 1.25kHz or fc are the situations of 2.5kHz as carrier frequency fc, initial temperature is 65 ℃, and then after moment t1, described temperature may be above 110 ℃.For avoiding this situation, when the inverter temperature T was 65 ℃, only when carrier frequency was 5kHz, torque limit value was set to little.Yet, when the inverter temperature T is 65 ℃ and when low carrier frequency was operated, desired torque was not limited to described torque limit value.
Utilize above structure, can at utmost produce desired torque, simultaneously, can protect described switching device.
Should be noted that, can further suppress the rising of inverter temperature T by the application process that changes torque limit value according to following description.
Although at rotating speed of motor increase scheduled volume and in the operating area that carrier frequency fc does not also increase, motor carries out limited operation based on described torque limit value at least.Pre-determine described torque limit value according to current carrier frequency fc and corresponding to the inverter temperature T of described switching device temperature.The aforesaid operations zone is the zone by boundary line W1 among Fig. 3 for example and W2A definition.In this zone, select the torque limit value of Fig. 4 based on the carrier frequency fc of current 2.5kHz, and motor carries out limited operation.
In the rotating speed of motor increase operating area that carrier frequency fc increases during scheduled volume at least, motor can carry out limited operation based on torque limit value, wherein, pre-determine described torque limit value according to the carrier frequency fc that increases and corresponding to the inverter temperature T of the temperature of described switching device.This zone is the zone by boundary line W2A among Fig. 3 for example and W2 definition.In this zone, select torque limit value among Fig. 4 based on the current carrier frequency fc of the carrier frequency fc of the 5kHz after the described increase rather than 2.5kHz, and motor carries out limited operation.
That is, in the operating area that carrier frequency is tended to increase afterwards, use and the corresponding limits value of carrier frequency that is higher than the prediction of current carrier frequency at the fixed time.And, can predict described carrier frequency based on monitoring to the increase/reduction of motor speed.To increase if predict described carrier frequency, and utilize with the corresponding limits value of predicted carrier frequency that is higher than current carrier frequency and before this changes, carry out described limited operation.In addition, can hysteresis be set for the use of described limits value.To reduce if predict described carrier frequency, and then need not to change, use and the corresponding limits value of current carrier frequency.
In this embodiment, based on rotating speed of motor carrier frequency is set.Alternatively, can carrier frequency be set based on car speed.
Though reference example embodiment has described the present invention,, need know, the invention is not restricted to described example embodiment or structure.On the contrary, the invention is intended to the arrangement that covers various modifications and be equal to.In addition, though show the various elements of example embodiment by various combinations and structure,, this is exemplary, other combination and structure comprise increase, reduce or only use discrete component, all fall within the spirit and scope of the present invention.
Claims (8)
1. a motor control unit is characterized in that, comprising:
The drive circuit of drive motors, this motor produce torque to obtain the actuating force of vehicle; And
Control the control section of described drive circuit, wherein,
Described control section utilizes limits value to control described drive circuit, thereby makes described motor carry out limited operation, determines described limits value according to the switching frequency of the switching device that comprises in described drive circuit and the temperature of described switching device.
2. motor control unit according to claim 1, wherein,
Described control section is by selecting described switching frequency to control described drive circuit according to described rotating speed of motor with from the torque that described motor obtains.
3. motor control unit according to claim 1, wherein,
Determine described limits value based on torque limit value, and pre-determine described torque limit value according to the switching frequency and the temperature of described switching device.
4. motor control unit according to claim 1, wherein,
Although, determine described limits value based on current switching frequency and the predetermined torque limit value of temperature according to described switching device when described rotating speed of motor increase when scheduled volume but described switching frequency do not increase at least, and,
When along with the described at least scheduled volume of described rotating speed of motor increase, when described switching frequency also increases, based on determining described limits value according to the switching frequency of the prediction higher and the predetermined described torque limit value of temperature of described switching device than described current switching frequency.
5. a vehicle is characterized in that, comprising:
Motor, it produces torque obtaining the actuating force of described vehicle, and,
Motor control unit, it controls described motor, wherein,
Described motor control unit comprises the drive circuit that is used to drive described motor, and the control section that is used to control described drive circuit, and
Described control section utilizes limits value to control described drive circuit, thereby makes described motor carry out limited operation, determines described limits value according to the switching frequency of the switching device that comprises in described drive circuit and the temperature of described switching device.
6. vehicle according to claim 5, wherein,
Described control section is by selecting described switching frequency to control described drive circuit according to described rotating speed of motor with from the torque that this motor obtains.
7. vehicle according to claim 5, wherein,
Determine described limits value based on torque limit value, and pre-determine described torque limit value according to the switching frequency and the temperature of described switching device.
8. vehicle according to claim 5, wherein,
Although, determine described limits value based on switching frequency and the predetermined torque limit value of temperature according to described switching device when described rotating speed of motor increase when scheduled volume but described switching frequency do not increase at least, and,
When along with the described at least scheduled volume of described rotating speed of motor increase, when described switching frequency also increases, based on determining described limits value according to the switching frequency of the prediction higher and the predetermined described torque limit value of temperature of described switching device than current switching frequency.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004380953 | 2004-12-28 | ||
| JP380953/2004 | 2004-12-28 | ||
| JP321238/2005 | 2005-11-04 |
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| Publication Number | Publication Date |
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| CN101091304A true CN101091304A (en) | 2007-12-19 |
| CN100544179C CN100544179C (en) | 2009-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800451842A Expired - Fee Related CN100544179C (en) | 2004-12-28 | 2005-12-27 | Motor control unit and be equipped with its vehicle |
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| CN (1) | CN100544179C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102458913A (en) * | 2009-06-09 | 2012-05-16 | 雷诺股份公司 | Electric motor assembly rechargeable from an electrical mains system, and dedicated connection housing |
| CN102947158A (en) * | 2010-06-24 | 2013-02-27 | 三菱电机株式会社 | Diesel hybrid vehicle system |
| CN102449891B (en) * | 2009-05-27 | 2014-07-16 | 丰田自动车株式会社 | Converter control device and electric vehicle using the same |
| CN105340163A (en) * | 2013-07-23 | 2016-02-17 | 爱信艾达株式会社 | Inverter device |
| CN106394262A (en) * | 2015-07-28 | 2017-02-15 | 通用汽车环球科技运作有限责任公司 | Method and apparatus to control an inverter |
| CN109318723A (en) * | 2018-10-19 | 2019-02-12 | 平湖宏远汽车座椅有限公司 | Electric children vehicle control system |
| CN111049100A (en) * | 2019-12-10 | 2020-04-21 | 中国电子科技集团公司第五十八研究所 | Bootstrap circuit with clamping function |
| CN111884531A (en) * | 2020-06-24 | 2020-11-03 | 华为技术有限公司 | Inverter switching frequency adjusting method, power assembly system and electric vehicle |
| CN112172527A (en) * | 2020-09-28 | 2021-01-05 | 重庆长安新能源汽车科技有限公司 | IGBT temperature protection frequency conversion control method for electric automobile |
| CN112912269A (en) * | 2018-10-10 | 2021-06-04 | 纬湃科技有限责任公司 | Multi-phase inverter for multiple sources in a vehicle and related high voltage topology |
| EP3412500B1 (en) * | 2011-12-21 | 2022-01-05 | Valeo Siemens eAutomotive France SAS | Method of exchanging electrical energy between an electrical network conveying a dc or ac electrical quantity and an electrical energy storage unit for hybrid or electric vehicle |
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- 2005-12-27 CN CNB2005800451842A patent/CN100544179C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102449891B (en) * | 2009-05-27 | 2014-07-16 | 丰田自动车株式会社 | Converter control device and electric vehicle using the same |
| CN102458913A (en) * | 2009-06-09 | 2012-05-16 | 雷诺股份公司 | Electric motor assembly rechargeable from an electrical mains system, and dedicated connection housing |
| CN102947158A (en) * | 2010-06-24 | 2013-02-27 | 三菱电机株式会社 | Diesel hybrid vehicle system |
| EP3412500B1 (en) * | 2011-12-21 | 2022-01-05 | Valeo Siemens eAutomotive France SAS | Method of exchanging electrical energy between an electrical network conveying a dc or ac electrical quantity and an electrical energy storage unit for hybrid or electric vehicle |
| CN105340163A (en) * | 2013-07-23 | 2016-02-17 | 爱信艾达株式会社 | Inverter device |
| CN105340163B (en) * | 2013-07-23 | 2017-12-08 | 爱信艾达株式会社 | DC-to-AC converter |
| CN106394262A (en) * | 2015-07-28 | 2017-02-15 | 通用汽车环球科技运作有限责任公司 | Method and apparatus to control an inverter |
| CN106394262B (en) * | 2015-07-28 | 2019-10-08 | 通用汽车环球科技运作有限责任公司 | The method and apparatus for controlling inverter |
| US11932115B2 (en) | 2018-10-10 | 2024-03-19 | Vitesco Technologies GmbH | Multi-phase inverter and related high voltage topology |
| CN112912269A (en) * | 2018-10-10 | 2021-06-04 | 纬湃科技有限责任公司 | Multi-phase inverter for multiple sources in a vehicle and related high voltage topology |
| CN109318723A (en) * | 2018-10-19 | 2019-02-12 | 平湖宏远汽车座椅有限公司 | Electric children vehicle control system |
| CN109318723B (en) * | 2018-10-19 | 2024-03-26 | 嘉兴宏远汽车座椅股份有限公司 | Electric baby carriage control system |
| CN111049100A (en) * | 2019-12-10 | 2020-04-21 | 中国电子科技集团公司第五十八研究所 | Bootstrap circuit with clamping function |
| CN111049100B (en) * | 2019-12-10 | 2021-09-03 | 中国电子科技集团公司第五十八研究所 | Bootstrap circuit with clamping function |
| CN111884531B (en) * | 2020-06-24 | 2022-07-19 | 华为数字能源技术有限公司 | Inverter switching frequency adjusting method, power assembly system and electric vehicle |
| CN111884531A (en) * | 2020-06-24 | 2020-11-03 | 华为技术有限公司 | Inverter switching frequency adjusting method, power assembly system and electric vehicle |
| CN112172527B (en) * | 2020-09-28 | 2022-05-03 | 重庆长安新能源汽车科技有限公司 | IGBT temperature protection frequency conversion control method for electric automobile |
| CN112172527A (en) * | 2020-09-28 | 2021-01-05 | 重庆长安新能源汽车科技有限公司 | IGBT temperature protection frequency conversion control method for electric automobile |
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