CN101010867A - Electric motor driving device, and air conditioner using the same - Google Patents
Electric motor driving device, and air conditioner using the same Download PDFInfo
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- CN101010867A CN101010867A CN 200580029403 CN200580029403A CN101010867A CN 101010867 A CN101010867 A CN 101010867A CN 200580029403 CN200580029403 CN 200580029403 CN 200580029403 A CN200580029403 A CN 200580029403A CN 101010867 A CN101010867 A CN 101010867A
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Abstract
In an electric motor driving device, an electric current to flow through an inverter (6) is detected. When a reference voltage value (Vref1) preset in a first current protection unit (8) is exceeded, first abnormal information is outputted simultaneously as the output of a driver (7) is interrupted, so that a drive signal generation unit (5) interrupts a drive signal instantly to prevent the breakage of the inverter (6). In case a reference voltage (Vref2) of a second current protection unit (9), as set to a lower value than the reference voltage value (Vref1), is exceeded, second abnormal information is outputted so that the drive signal generation unit (5) interrupts the drive signal instantly. When the second abnormal information is not inputted after that, the drive signal is outputted again to prevent the breakage of the inverter (6) without stopping a brushless motor (3) frequently.
Description
Technical field
The present invention relates generally to any rotating speed and drives the motor drive that is loaded in the motor such as brushless DC motor in the air regulator etc.
Background technology
In recent years, in the device of the motor such as fan motor in driving air regulator, from the viewpoint of the environment of preserving our planet, reducing the necessity that consumes electric power increases greatly.Wherein, as one of technology of power saving, be extensive use of with the converter of this high-efficiency electric motor of frequency drives brushless DC motor (inverter) arbitrarily usually etc.In addition, as drive unit,, use converter, drive signal to transmit the driver (driver) of usefulness and the IC of overcurrent protective device one in order to make its miniaturization.
Fig. 5 represents to be used to drive the prior art system structure of the motor that uses this IC.In Fig. 5, the motor drive of prior art comprises IC52, fixed resistor 54, drive signal generating unit 55, converter 56, driver 57 and the first current protection portion 58.Brushless motor 53 is controlled by IC52.IC52 is made of converter 56, driver 57 and the first current protection portion 58.Converter 56 has 3 series circuits, and this series circuit is connected in series the pair of switches element according to the upstream side of electric current and the relation in downstream.And, put on these series circuits via fixed resistor 54 from the dc voltage of DC power supply 51 outputs.
Drive signal generating unit 55 generates the PWM of the target velocity that is used to realize brushless motor 53, and (Pulse Width Modulation: pulse width modulation) signal, this brushless motor has the three-phase coil at center that neutral point Y is connected.And, amplify this pwm signal, control change device 56 with driver 57.
In addition, destroyed in order to prevent flow through converter 56, converter 56 of overcurrent, detect the voltage that is connected in fixed resistor 54 two ends between DC power supply 51 minus sides and the converter 56 by the first current protection portion 58.When the magnitude of voltage at two ends surpassed the standard voltage value Vref1 that is pre-set in the first current protection portion 58, the first current protection portion 58 cut off the output of driver 57.Simultaneously, output abnormality information.In addition, drive signal generating unit 55 when the input abnormal information, is cut off drive signal immediately.And,, also continue to cut off drive signal even no longer import abnormal information.
Carry out the drive controlling of brushless motor 53 with above-mentioned circuit structure.This technology contents for example is disclosed in the Japanese kokai publication hei 9-294392 communique.
But; in this existing driving; if imagination flows through an overcurrent only and sets the current value that carries out the overcurrent protection action; the electric current of converter 56 is below the current value of overcurrent protection action even then flow through; when continuing to flow through continuously or repeatedly, converter 56 also can be owing to overheated and destroyed.Therefore, be necessary to use hot very abundant converter, large-scale radiator perhaps is installed in converter, exist to cause the problem that device maximizes or cost improves.
Otherwise; do not produce the value of heat damage if the current value of overcurrent protection action is set at by the electric current that continues continuously or repeatedly to flow through; even then flow through one or many when motor starting or quicken the medium overcurrent that heat damage can not take place in short-term; also can keep the output of drive signal generating unit to cut off, have problems such as motor stops.
Summary of the invention
The objective of the invention is to address the above problem, provide a kind of motor that makes not stop continually, can protect the small-sized and cheap motor drive of converter reliably.
The motor drive of the present invention that is used to address the above problem is characterized in that, comprising: the converter that drives threephase motor; Amplify drive signal and send it to the driver of described converter; The first current protection portion, the external resistance of the bus by being connected in described converter detects the electric current of the described converter of flowing through, and when detected value surpasses predefined first standard value, cuts off the output of described driver, exports first abnormal information simultaneously; The second current protection portion, the electric current of the described converter of flowing through surpass set less than second standard value of first standard value time, export second abnormal information; With the drive signal generating unit that generates drive signal.Described drive signal generating unit when input first abnormal information, is cut off drive signal immediately, even no longer import first abnormal information, also continues to cut off drive signal; During second abnormal information, cut off drive signal in input immediately, if no longer import second abnormal information, output drive signal once more then.
In addition, motor drive of the present invention is characterized in that, comprising: the converter that drives threephase motor; Amplify drive signal and send it to the driver of described converter;
The first current protection portion, the external resistance of the bus by being connected in described converter detects the electric current of the described converter of flowing through, and when detected value surpasses predefined first standard value, cuts off the output of described driver, exports first abnormal information simultaneously; The second current protection portion, the electric current of the described converter of flowing through surpass set greater than second standard value of first standard value time, export second abnormal information; With the drive signal generating unit that generates drive signal.Described drive signal generating unit during first abnormal information, is cut off drive signal in input immediately, if no longer import first abnormal information, and output drive signal once more then; When input second abnormal information, cut off drive signal immediately, even no longer import second abnormal information, also continue to cut off drive signal.
According to motor drive of the present invention, motor is not stopped continually, realization can be protected the small-sized and cheap motor drive of converter reliably.
Description of drawings
Fig. 1 is the block diagram of the structure of expression first execution mode of motor drive of the present invention and second execution mode.
Fig. 2 is the figure of converter protection of first execution mode of expression motor drive of the present invention.
Fig. 3 is the figure of converter protection of second execution mode of expression motor drive of the present invention.
Fig. 4 is the block diagram with air regulator of motor drive of the present invention.
Fig. 5 is the block diagram of the existing motor drive structure of expression.
Symbol description
1: DC power supply; 2:IC; 3: brushless motor; 4: fixed resistor; 5: the drive signal generating unit; 6: converter; 7: driver; 8: the first current protection portions; 9: the second current protection portions.
Embodiment
Below, with reference to the accompanying drawings first execution mode of the present invention is described.Fig. 1 is the block diagram of this first execution mode structure of expression.The motor drive of first embodiment of the invention comprises: IC2, fixed resistor 4, drive signal generating unit 5, converter 6, driver 7, the first current protection portion 8 and the second current protection portion 9.By IC2 control brushless motor 3.Constitute IC2 by converter 6, driver 7 and the first current protection portion 8.Converter 6 has three series circuits, and this series circuit is connected in series the pair of switches element according to the upstream side of electric current and the relation in downstream.And, put on these series circuits via fixed resistor 4 from the dc voltage of DC power supply 1 output.
Drive signal generating unit 5 generates the pwm signal of the target velocity that is used to realize brushless motor 3, and this brushless motor has the three-phase coil at center that neutral point Y is connected in.And, amplify control change device 6 by driver 7.
Below, with Fig. 2 the protection of converter is described.The current value of the converter 6 of flowing through is transformed to the minus side that is connected in DC power supply 1 and the magnitude of voltage at fixed resistor 4 two ends between the converter 6, detects.Surpass when being pre-set in the standard voltage value Vref1 of the first current protection portion 8 at this magnitude of voltage, the first current protection portion 8 cuts off the output of drivers 7, exports first abnormal information simultaneously.Drive signal generating unit 5 when input first abnormal information, is cut off drive signal immediately.Even no longer import first abnormal information afterwards, also continue to cut off drive signal, prevent that converter 6 is destroyed.
In addition, when the magnitude of voltage at fixed resistor 4 two ends surpasses the standard voltage value Vref2 of the second current protection portion 9 that sets the value littler than standard voltage value Vref1 for, the second current protection portion, 9 outputs, second abnormal information.Drive signal generating unit 5 when input second abnormal information, is cut off drive signal immediately.If no longer import second abnormal information afterwards, input drive signal once more then.
By these actions, brushless motor is not stopped continually, prevent to destroy converter 6.
Second execution mode
Below, with Fig. 1 and Fig. 3 the protection of the converter of second embodiment of the invention is described.Motor drive shown in Figure 1 is identical with first execution mode, the Therefore, omited explanation.The current value of the converter 6 of flowing through is transformed to the minus side that is connected in DC power supply 1 and the magnitude of voltage at fixed resistor 4 two ends between the converter 6, detects.Surpass when being pre-set in the standard voltage value Vref1 of the first current protection portion 8 at this magnitude of voltage, the first current protection portion 8 cuts off the output of drivers 7, exports first abnormal information simultaneously.Drive signal generating unit 5 when input first abnormal information, is cut off drive signal immediately.If no longer import first abnormal information afterwards, then output drive signal once more thus, does not stop brushless motor continually, prevents to destroy converter 6.
In addition, when the magnitude of voltage at fixed resistor 4 two ends surpasses the standard voltage value Vref2 of the second current protection portion 9 that sets the value bigger than standard voltage value Vref1 for, the second current protection portion, 9 outputs, second abnormal information.Drive signal generating unit 5 when input second abnormal information, is cut off drive signal immediately.Even no longer import second abnormal information afterwards, also continue to cut off drive signal, prevent to destroy converter 6.
By above structure, motor is not stopped continually, realization can be protected the small-sized and cheap motor drive of converter reliably.
The 3rd execution mode
Fig. 4 is the block diagram with air regulator of motor drive of the present invention.In Fig. 4, air regulator 41 comprises DC power supply 44, motor drive 42, brushless motor 43 and fan 45.DC power supply 44 is to motor drive 42 supply capabilities.Motor drive 42 is by the air output of brushless motor 43 control fans 45.
By the overcurrent of control protection motor drive 42 of the present invention, even because the load of the fan 45 in the air regulators such as variation 41 of environment temperature becomes big, fan can not stop continually yet, can keep stable action.
Utilizability on the industry
Motor drive of the present invention needn't use the very abundant converter of heat, perhaps Large-scale radiator is installed in converter, therefore, can be consisted of small-sized and cheap system. In addition, motor is not stopped continually, can protect reliably converter, therefore, for The motor drive etc. that drives the motor such as brushless DC motor with any rotating speed is very useful.
Claims (3)
1. motor drive is characterized in that:
Comprise: the converter that drives threephase motor;
Amplify drive signal and send it to the driver of described converter;
The first current protection portion, the external resistance of the bus by being connected in described converter detects the electric current of the described converter of flowing through, and when detected value surpasses predefined first standard value, cuts off the output of described driver, exports first abnormal information simultaneously;
The second current protection portion, the electric current of the described converter of flowing through surpass set less than second standard value of described first standard value time, export second abnormal information; With
Generate the drive signal generating unit of drive signal,
Described drive signal generating unit, when input first abnormal information, cut off drive signal immediately, even no longer import first abnormal information, also continue to cut off drive signal, when input second abnormal information, cut off drive signal immediately, if no longer import second abnormal information, output drive signal once more then.
2. motor drive is characterized in that:
Comprise: the converter that drives threephase motor;
Amplify drive signal and send it to the driver of described converter;
The first current protection portion, the external resistance of the bus by being connected in described converter detects the electric current of the described converter of flowing through, and when detected value surpasses predefined first standard value, cuts off the output of described driver, exports first abnormal information simultaneously;
The second current protection portion, the electric current of the described converter of flowing through surpass set greater than second standard value of described first standard value time, export second abnormal information; With
Generate the drive signal generating unit of drive signal,
Described drive signal generating unit, when input first abnormal information, cut off drive signal immediately, if no longer import first abnormal information, then output drive signal once more when input second abnormal information, cuts off drive signal immediately, even no longer import second abnormal information, also continue to cut off drive signal.
3. an air regulator is characterized in that: use claim 1 or 2 described motor drives.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP255227/2004 | 2004-09-02 | ||
| JP2004255227 | 2004-09-02 | ||
| JP052827/2005 | 2005-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101010867A true CN101010867A (en) | 2007-08-01 |
Family
ID=38698152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580029403 Pending CN101010867A (en) | 2004-09-02 | 2005-08-24 | Electric motor driving device, and air conditioner using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101010867A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025317A (en) * | 2009-09-18 | 2011-04-20 | 欧姆龙汽车电子株式会社 | Motor drive device |
| CN102684162A (en) * | 2011-03-16 | 2012-09-19 | 现代摩比斯株式会社 | High pressure protection circuit of low voltage DC converter and method thereof |
| CN102763319A (en) * | 2010-02-10 | 2012-10-31 | 松下电器产业株式会社 | Brushless motor drive device, brushless motor, and air conditioner |
| CN107294067A (en) * | 2016-03-30 | 2017-10-24 | 比亚迪股份有限公司 | Guard method, device and the electric automobile of inverter |
-
2005
- 2005-08-24 CN CN 200580029403 patent/CN101010867A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025317A (en) * | 2009-09-18 | 2011-04-20 | 欧姆龙汽车电子株式会社 | Motor drive device |
| CN102763319A (en) * | 2010-02-10 | 2012-10-31 | 松下电器产业株式会社 | Brushless motor drive device, brushless motor, and air conditioner |
| CN102763319B (en) * | 2010-02-10 | 2015-07-01 | 松下电器产业株式会社 | Brushless motor drive device, brushless motor, and air conditioner |
| CN102684162A (en) * | 2011-03-16 | 2012-09-19 | 现代摩比斯株式会社 | High pressure protection circuit of low voltage DC converter and method thereof |
| CN107294067A (en) * | 2016-03-30 | 2017-10-24 | 比亚迪股份有限公司 | Guard method, device and the electric automobile of inverter |
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