CN103023426A - Motor driver and motor driving method - Google Patents
Motor driver and motor driving method Download PDFInfo
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- CN103023426A CN103023426A CN2011103013175A CN201110301317A CN103023426A CN 103023426 A CN103023426 A CN 103023426A CN 2011103013175 A CN2011103013175 A CN 2011103013175A CN 201110301317 A CN201110301317 A CN 201110301317A CN 103023426 A CN103023426 A CN 103023426A
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- booster
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Abstract
The invention discloses a motor driver and a motor driving method which are used for realizing drive of a motor when a direct current booster fails. The motor driver comprises a direct current booster (12) used for boosting the voltage of a direct current power supply (201), a filter capacitor (C1), an inverter (14) connected with the direct current booster (12) and used for converting the voltage boosted by the direct current booster (12) into an alternating current voltage and transmitting the alternating current voltage to the motor (M), and a first control switch (S2) connected in parallel with the direct current booster (12), wherein when the direct current booster (12) fails, the first control switch (S2) is switched on to ensure that the direct current booster (12) bypasses, and thus the motor driver is prevented from failing due to the failure of the direct current booster, and the safety, stability and fault-tolerant capability of the whole motor driver are improved.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of motor driver and driving method.
Background technology
In the prior art, motor driver is used for the output voltage of DC power supply is offered motor with drive motors work, such motor driver mainly comprises DC booster and inverter, be delivered to inverter (Inverter) after will DC power supply voltage raising, offer motor after then by inverter the direct voltage of battery being converted to alternating voltage.
US Patent No. 7164253B2 discloses a kind of like this motor driver, and wherein, motor driver comprises DC booster (Boost Converter) 12 and inverter 14, referring to shown in Figure 1.DC booster 12 offers inverter 14 after changing for the output voltage with DC power supply, and inverter 14 offers motor after changing alternating voltage into for the direct voltage with DC booster 12 outputs.But, in the scheme that patent US7164253B2 provides, had when DC booster 12 lost efficacy the problem that can cause motor driver to lose efficacy.
Summary of the invention
One aspect of the present invention provides a kind of motor driver and driving method, to realize the driving to motor when stepup transformer lost efficacy.
The invention provides a kind of motor driver, this motor driver comprises: DC booster, for the voltage of rising DC power supply; Filter capacitor; The inverter that is connected with described DC booster, the voltage transitions after being used for described DC booster raise is to be transferred to motor behind the alternating voltage; First control switch in parallel with described DC booster, described the first control switch are closed when described DC booster lost efficacy, thereby make the described DC booster bypass of inefficacy.Owing to be provided with first control switch in parallel with DC booster, therefore closure the first control switch when DC booster lost efficacy, make DC power supply directly provide input voltage for inverter, can effectively avoid whole motor driver to lose efficacy, thereby improve the fail safe of whole motor driver, stability and fault-tolerant ability have guaranteed the driving of motor.
Preferably, this motor driver also comprises: the second control switch and resistance, branch road after described the second control switch and the series connection of described resistance is in parallel with described DC booster, and described the second control switch is closed when motor driver starts, and described electric capacity is charged.Make the electric current of the second control switch place branch road less by resistance, the second control switch closure is capacitor charging when motor driver starts, and realizes the soft start of electric capacity, can effectively protect electric capacity, prevents that electric capacity from being burnt by large electric current.
Preferably, this motor driver further comprises a control assembly, be connected to described the first control switch and described DC booster, be used for monitoring the operating state of described DC booster and controlling described the first control switch, when described DC booster lost efficacy, it is closed that described control assembly is controlled described the first control switch, and then make described DC booster bypass.Utilize control assembly the operating state of DC booster to be monitored and the first control switch is controlled, can improve better the Performance And Reliability of motor driver.
Preferably, this motor driver further comprises a control assembly, be connected to described the first control switch, described DC booster and the second control switch, be used for monitoring the operating state of described DC booster and controlling described the first control switch and described the second control switch, when described DC booster lost efficacy, it is closed that described control assembly is controlled described the first control switch, and then make described DC booster bypass, and when described the second control switch closure of motor driver startup control system, described electric capacity is charged.Utilize control assembly the operating state of DC booster to be monitored and the first control switch and the second control switch are controlled, can improve better the Performance And Reliability of motor driver.
Preferably, resistance is thousand grades of Ohmic resistances.Can make like this electric current of the second control switch place branch road less, be capacitor charging when the second control switch is closed, realizes the soft start of electric capacity, can effectively protect electric capacity, prevents that electric capacity from being burnt by large electric current.
Preferably, in motor driver of the present invention, described control assembly is also connected to described motor, be used for monitoring the load of described motor, when described load was lower than a thresholding, described the first control switch closure of often opening of described control assembly control made described DC booster bypass.Because under the operating mode of low load, only have input voltage when inverter to equal even during less than cell voltage, motor just can be operated in optimum efficiency, therefore above-mentioned design operation can more fast and effeciently make motor move with optimum efficiency.
Preferably, motor driver of the present invention also comprises the 3rd control switch, and it is connected with described control assembly.By the 3rd control switch, can carry out the open and close operation to motor driver more easily.
Preferably, described the first control switch and the second control switch are two contacts of a contactor, and wherein said the first control switch is main contacts, and the second control switch is auxiliary contact.
The present invention also provides a kind of method of motor driver drive motors, may further comprise the steps: the operating state of monitoring DC booster; When monitoring described DC booster inefficacy, described control assembly is controlled the first control switch closure in parallel with described DC booster and is made described DC booster bypass, DC power supply directly provides direct current for inverter, and voltage inverter is transferred to motor after changing direct voltage into alternating voltage thereafter.
Further preferably, described method also comprises step: further monitor the load of motor, when the load that monitors the working properly and motor of described DC booster during less than or equal to default thresholding, it is closed to control described the first control switch.
Utilize said motor driver of the present invention and method, can greatly improve global reliability and the fault-tolerant ability of motor driver.
Description of drawings
Hereinafter will also come by reference to the accompanying drawings the above-mentioned characteristic of the present invention, technical characterictic, advantage and execution mode thereof are further described by the explanation to preferred implementation in clear and definite understandable mode, wherein:
Fig. 1 is the structure chart of motor driver in the prior art;
Fig. 2 is according to embodiment of the present invention, the basic block diagram of motor driver;
Fig. 3 is according to embodiment of the present invention, the preferred structure figure of motor driver;
Fig. 4 is according to embodiment of the present invention, the method flow diagram of motor driver drive motors; With
Fig. 5 is according to embodiment of the present invention, the method for optimizing flow chart of motor driver drive motors.
The reference symbol table
12 DC booster, 14 inverters, 201 DC power supply, 202 control assemblies
S2 the first control switch S1 the second control switch S3 the 3rd control switch
M motor R resistance C1 electric capacity
Step 401 step 402 step 403 step 501 step 502 step 503 step 504 step 505 step 506
Embodiment
For to technical characterictic of the present invention, purpose and effect have more clearly to be understood, and now contrasts description of drawings the specific embodiment of the present invention, and identical label represents identical part in each figure.Be structure and the correlation thereof of clear each parts of expression, the proportionate relationship of each parts only is schematically in the accompanying drawing, does not represent the proportionate relationship of practical structures.
Fig. 2 shows a kind of motor driver that present embodiment provides, and comprising: DC booster 12 is used for being transferred to inverter 14 after the voltage rising with DC power supply 201; The inverter 14 that is connected with DC booster 12 is used for being transferred to motor M after direct voltage with DC booster 12 outputs is converted to alternating voltage; The first control switch S2 that often opens in parallel with DC booster 12 was used for when DC booster 12 lost efficacy closedly, made DC booster 12 bypasses.Owing to be provided with the first control switch S2 in parallel with DC booster 12, it is closed therefore to control the first control switch S2 when DC booster 12 lost efficacy, and makes DC power supply 201 directly for inverter 14 provides input voltage, has guaranteed the driving of motor M.
In a preferred embodiment of the invention, motor driver also further includes control assembly 202, connect the first control switch S2 and DC booster 12, be used for monitoring DC booster 12 operating state, be whether DC booster 12 lost efficacy, and according to the opening and closing of the working state control first control switch S2 of DC booster 12, and then whether control DC booster 12 is bypassed.Under the monitoring and control of control assembly 202, overall performance and the reliability of motor driver get a promotion.
Preferably, described motor driver also comprises the second control switch S1, referring to shown in Figure 3.Often open the second control switch S1 and connect with a resistance R, its place branch road is in parallel with DC booster 12, and the second control switch S1 closure is capacitor C 1 charging when motor driver starts, and in normal operation, this second control switch S1 opens.Further preferably, resistance R is thousand grades of Ohmic resistances.Make the electric current of the second control switch S1 place branch road less by resistance R, realize the soft start of electric capacity, can effectively protect electric capacity, prevent that electric capacity from being burnt by large electric current.Similarly, control assembly 202 also can be connected to described the first control switch S2, described DC booster 12 and the second control switch S1 simultaneously, be used for monitoring the operating state of described DC booster 12 and controlling described the first control switch S2 and described the second control switch S1, when described DC booster 12 lost efficacy, described the first control switch S2 is closed in described control assembly 202 controls, and then make described DC booster 12 bypasses, and when described the second control switch S1 closure of motor driver startup control system, described capacitor C 1 is charged.
In another embodiment, control assembly 202 can be arranged to, and when DC booster 12 did not lose efficacy, controls the open and close of the first control switch S2 according to the load of motor M.Because when the motor M load is low, the operating efficiency of motor M was better when the input voltage of inverter 14 was equal to or less than DC power supply 201 voltage, therefore when the motor M load is low, also make DC booster 12 bypasses, so that DC power supply 201 directly provides input voltage for inverter 14.Wherein, the load of motor M can be embodied by the rotating speed of motor M, if rotating speed is not higher than default thresholding, confirms that then the load of motor M is lower, otherwise confirms that load is higher.
Preferably, the first control switch S2 and the second control switch S1 are two contacts of contactor in the present embodiment, the ability that the first control switch S2 bears electric current is far above the second control switch S1, and therefore the first control switch S2 is main contacts, and the second control switch S1 is auxiliary contact.
For the ease of the switch of control motor driver, motor driver also comprises the 3rd control switch S3 in the present embodiment, connects with DC power supply 201.
More than introduced the structure of motor driver, the below is introduced the process of motor driver drive motors.
Referring to Fig. 4, the method for motor driver drive motors may further comprise the steps in the present embodiment:
Step 401: the operating state of control assembly 202 monitoring DC booster 12;
Step 402: when monitoring DC booster 12 inefficacy, the first control switch S2 is closed in control assembly 202 controls, make DC booster 12 bypasses, thereby DC power supply directly provides direct voltage for inverter 14.
Step 403: inverter 14 is transferred to motor M after changing direct voltage into alternating voltage.
In a preferred embodiment of the invention, motor driver also comprises: the second control switch S1 and resistance R, the branch road after the second control switch S1 and the resistance R series connection is in parallel with DC booster 12.Referring to shown in Figure 5, the operation of motor driver drive motors may further comprise the steps:
Step 501: when motor driver started, control assembly 202 controls the first control switch S2 disconnected, and it is closed to control the second control switch S1, and making DC power supply 201 is capacitor C 1 charging by the second control switch S1.Making the electric current of the second control switch S1 place branch road less by resistance R, is capacitor C 1 charging when the second control switch S1 is closed, realizes the soft start of capacitor C 1, can effectively protect capacitor C 1, prevents that the large electric current of capacitor C 1 quilt from burning.When motor driver need to be safeguarded, can make capacitor C 1 discharge by disconnecting the second control switch S1 and DC booster 12.
Step 502: after capacitor C 1 charging, the DC booster 12 that control assembly 202 controls can work is communicated with, and controls the second control switch S1 disconnection.Realized that motor driver was to the driving of motor when DC booster was normal.
Step 503: when the load that control assembly 202 detects motor M is not higher than default thresholding, control that the first control switch S2 disconnects and the second control switch S1 closure.Because when motor load was low, the operating efficiency of motor was better when the input voltage of inverter was equal to or less than DC power supply voltage, therefore when motor load is low, also make DC booster 12 bypasses, so that DC power supply directly provides input voltage for inverter 14.
In the situation, present embodiment adopted closed the first control switch S2 and disconnects the scheme of the second control switch S1 the operating efficiency of motor preferably when the input voltage of inverter was lower than DC power supply voltage.Certainly, also can disconnect the first control switch S2 in this case and closed the second control switch S1 is lower than the voltage of DC power supply so that inverter 14 to be provided.Motor M is operated under the suitable voltage.But the power of newly-increased resistance consumption may be operated under the voltage that DC power supply 201 provides than the power that is operated in additive decrementation under the suitable voltage greater than motor M, therefore closed the first control switch S2 and disconnect the second control switch S1 DC power supply 201 is directly powered is a kind of better scheme when the motor M load is low.
Step 504: the load that control assembly 202 detects motor M is higher than default thresholding and DC booster 12 when working properly, controls the first control switch S2 and the second control switch S1 and disconnects.By disconnecting the first control switch S2 and the second control switch S1, make DC booster 12 provide suitable input voltage for inverter 14.
Step 505: control assembly 202 is when sensing DC booster 12 inefficacy, and lower the first control switch S2 is closed in control, and DC power supply directly provides direct voltage for inverter 14.
Step 506: inverter 14 offers motor M after direct voltage is converted to alternating voltage.
The embodiment of the invention is by the first control switch S2 in parallel with DC booster 12, seasonal the first control switch S2 is closed in DC booster 12 inefficacies, make DC booster 12 bypasses, inverter 14 is to work under DC power supply 201 voltages at input power, effectively avoid because DC booster 12 loses efficacy motor driver being lost efficacy, thereby improve fail safe, stability and the fault-tolerant ability of whole motor driver.And also can closed the first control switch S2 in the lower situation of motor M load and make DC booster 12 bypasses, it is quicker effectively to make the output voltage of DC booster 12 equal the scheme of DC power supply 201 voltages by control DC booster 12 in Fig. 1.The embodiment of the invention also is provided with resistance R and the second control switch S1 of series connection, and the branch road after the series connection is in parallel with DC booster 12.When motor driver starts, be capacitor C 1 charging by closed the second control switch S1, realize the soft start of capacitor C 1, can effectively protect capacitor C 1.After being capacitor C 1 charging, disconnect the second control switch S1, and determine whether to make DC booster 12 to be communicated with according to the load condition of motor M, for inverter 14 provides input voltage.
Above by accompanying drawing and preferred implementation the present invention has been carried out detail display and explanation, yet the invention is not restricted to the execution mode that these have disclosed, other scheme that ability and technical staff therefrom derive out is also within protection scope of the present invention.
Claims (10)
1. a motor driver is characterized in that, comprising:
DC booster (12) is for the voltage of rising DC power supply (201);
Filter capacitor (C1);
The inverter (14) that is connected with described DC booster (12), the voltage transitions after being used for described DC booster (12) raise is to be transferred to motor (M) behind the alternating voltage;
First control switch (S2) in parallel with described DC booster (12), described the first control switch (S2) are closed when described DC booster (12) lost efficacy, thereby make described DC booster (12) bypass of inefficacy.
2. motor driver as claimed in claim 1, it is characterized in that, this motor driver also comprises: the second control switch (S1) and resistance (R), the branch road after described the second control switch (S1) and described resistance (R) series connection is in parallel with described DC booster (12).
3. motor driver as claimed in claim 1, it is characterized in that, this motor driver further comprises a control assembly (202), be connected to described the first control switch (S2) and described DC booster (12), be used for monitoring the operating state of described DC booster (12) and controlling described the first control switch (S2), when described DC booster (12) lost efficacy, described control assembly (202) control described the first control switch (S2) closure, and then make described DC booster (12) bypass.
4. motor driver as claimed in claim 2, it is characterized in that, this motor driver further comprises a control assembly (202), be connected to described the first control switch (S2), described DC booster (12) and the second control switch (S1), be used for monitoring the operating state of described DC booster (12) and controlling described the first control switch (S2) and described the second control switch (S1), described control assembly (202) is designed to: when described DC booster (12) lost efficacy, described control assembly (202) control described the first control switch (S2) closure, and then make described DC booster (12) bypass, and when described the second control switch of motor driver startup control system (S1) closure, (C1) charges to described electric capacity.
5. motor driver as claimed in claim 2 is characterized in that, described resistance (R) is thousand grades of Ohmic resistances.
6. such as claim 3 or 4 described motor drivers, it is characterized in that, described control assembly (202) is also connected to described motor (M), be used for monitoring the load of described motor (M), when described load is lower than a thresholding, described the first control switch (S2) closure of often opening of described control assembly (202) control makes described DC booster (12) bypass.
7. such as claim 3 or 4 described motor drivers, it is characterized in that this motor driver also comprises the 3rd control switch (S3), it is connected with described control assembly (202).
8. motor driver as claimed in claim 2, it is characterized in that, described the first control switch (S2) and the second control switch (S1) are two contacts of a contactor, wherein said the first control switch (S2) is main contacts, and described the second control switch (S1) is auxiliary contact.
9. the method for a motor driver drive motors is characterized in that, may further comprise the steps:
Step (401): the operating state of monitoring DC booster (12);
Step (402): when monitoring described DC booster (12) inefficacy, first control switch (S2) in parallel with described DC booster (12) is closed and make described DC booster (12) bypass, DC power supply (201) directly provide direct voltage for inverter (14);
Step (403): inverter (14) is transferred to motor (M) after changing direct voltage into alternating voltage.
10. method as claimed in claim 9 is characterized in that,
Described method also comprises step (503): the load of further monitoring motor (M), when the load that monitors the working properly and motor (M) of described DC booster (12) during less than or equal to default thresholding, control described the first control switch (S2) closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103013175A CN103023426A (en) | 2011-09-28 | 2011-09-28 | Motor driver and motor driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103013175A CN103023426A (en) | 2011-09-28 | 2011-09-28 | Motor driver and motor driving method |
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|---|---|
| CN103023426A true CN103023426A (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103013175A Pending CN103023426A (en) | 2011-09-28 | 2011-09-28 | Motor driver and motor driving method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105324934A (en) * | 2013-06-21 | 2016-02-10 | 丹佛斯电力电子有限公司 | Dual power mode drive |
| WO2018053693A1 (en) * | 2016-09-20 | 2018-03-29 | 深圳市大疆创新科技有限公司 | Motor control system and unmanned aircraft |
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| JPH02308935A (en) * | 1989-05-23 | 1990-12-21 | Mazda Motor Corp | Engine control device |
| CN101336173A (en) * | 2006-01-26 | 2008-12-31 | 丰田自动车株式会社 | Power source apparatus for vehicle, vehicle and method of controlling power source apparatus |
| CN201422073Y (en) * | 2009-01-19 | 2010-03-10 | 上海大郡自动化系统工程有限公司 | Voltage boosting-reducing DC/DC converter |
| CN101978592A (en) * | 2008-03-18 | 2011-02-16 | 丰田自动车株式会社 | Motor drive control apparatus, vehicle with motor drive control apparatus, and motor drive control method |
| CN102158100A (en) * | 2011-03-01 | 2011-08-17 | 山东沃森电源设备有限公司 | Triphase variable-frequency power supply with high power and operating method thereof |
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2011
- 2011-09-28 CN CN2011103013175A patent/CN103023426A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02308935A (en) * | 1989-05-23 | 1990-12-21 | Mazda Motor Corp | Engine control device |
| CN101336173A (en) * | 2006-01-26 | 2008-12-31 | 丰田自动车株式会社 | Power source apparatus for vehicle, vehicle and method of controlling power source apparatus |
| CN101978592A (en) * | 2008-03-18 | 2011-02-16 | 丰田自动车株式会社 | Motor drive control apparatus, vehicle with motor drive control apparatus, and motor drive control method |
| CN201422073Y (en) * | 2009-01-19 | 2010-03-10 | 上海大郡自动化系统工程有限公司 | Voltage boosting-reducing DC/DC converter |
| CN102158100A (en) * | 2011-03-01 | 2011-08-17 | 山东沃森电源设备有限公司 | Triphase variable-frequency power supply with high power and operating method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105324934A (en) * | 2013-06-21 | 2016-02-10 | 丹佛斯电力电子有限公司 | Dual power mode drive |
| US9742338B2 (en) | 2013-06-21 | 2017-08-22 | Danfoss Power Electronics A/S | Dual power mode drive |
| WO2018053693A1 (en) * | 2016-09-20 | 2018-03-29 | 深圳市大疆创新科技有限公司 | Motor control system and unmanned aircraft |
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Application publication date: 20130403 |