CN106953519B - A circuit and method for optimizing the loss of a permanent magnet DC brushless motor driver - Google Patents
A circuit and method for optimizing the loss of a permanent magnet DC brushless motor driver Download PDFInfo
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- CN106953519B CN106953519B CN201710195460.8A CN201710195460A CN106953519B CN 106953519 B CN106953519 B CN 106953519B CN 201710195460 A CN201710195460 A CN 201710195460A CN 106953519 B CN106953519 B CN 106953519B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/02—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for optimising the efficiency at low load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of circuits and method for optimizing non-brush permanent-magnet DC motor driver losses, applied in permanent magnetic brushless direct-current motor driver, the driver includes first branch bridge arm, second branch bridge arm and third branch bridge arm, one end of first branch bridge arm, second branch bridge arm and third branch bridge arm is connected with the anode of power supply respectively, and the other end is connected with the cathode of power supply；First resistor is set on first branch bridge arm, and one end of first resistor is connected with first branch bridge arm, and the other end is connected with the cathode of power supply；And/or second resistance is set on second branch bridge arm, one end of second resistance is connected with second branch bridge arm, and the cathode of other end power supply is connected；And/or 3rd resistor is set on third branch bridge arm, one end of 3rd resistor is connected with third branch bridge arm, and the cathode of other end power supply is connected.The embodiment of the present invention can accomplish that non-brush permanent-magnet DC motor driver losses are minimum in full-load range.
Description
Technical field
The present invention relates to electronic circuit technology field more particularly to a kind of optimization non-brush permanent-magnet DC motor driver losses
Circuit and method.
Background technique
Currently, as new-energy automobile continues to develop, non-brush permanent-magnet DC motor is widely applied in electric car, such as electricity
The main driving of electrical automobile, Air Condition Compressor for Electric Vehicle driving.For the various drivers of electric car, one side degree of protection is needed
Want high, at least up to IP65 (Ingress Protection), degree of protection height means that heat dissipation is difficult, it is necessary to design low-loss
Driver；Another aspect motor power comes from battery, in order to extend stand-by time, it is desirable that drive efficiency is high, it is also desirable to set
Count low-loss driver.
However, existing non-brush permanent-magnet DC motor driver in the market, some is the chopping method (reference using optimization
Document: influence of five kinds of PWM modes to DC brushless motor system Commutation Torque Ripple；Electric Machines and Control 2013 7
Month), the switching loss of power tube is reduced, but there is no reduce power tube conduction loss for this method；Some is for conducting
Loss optimizes, and does synchronous rectification scheme (bibliography: PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR
DRIVES USING ST7MC, STMicw Electronics profile AN2009), and this optimization is just for being supported on middle load, again
Optimization when load, be lost at light load instead can be than not doing synchronous rectification when it is big.
That is, how to find it is a kind of in the underloading of load current, it is middle carry, heavy duty in the case where, can reduce forever
The loss of magnetic driver for brushless DC motor, becomes urgent problem to be solved.
Summary of the invention
Aiming at the shortcomings existing in the above problems, the application provides a kind of optimization non-brush permanent-magnet DC motor driver
The circuit and method of loss, and then it is straight can to reduce permanent magnetism in the case where the underloading of load current, middle load, heavy duty
Flow the loss of brushless motor driver.
The application first aspect provides a kind of circuit for optimizing non-brush permanent-magnet DC motor driver losses, is applied to permanent magnetism
In brushless direct current motor driver, the permanent magnetic brushless direct-current motor driver includes first branch bridge arm, second branch bridge arm
And third branch bridge arm, one end of the first branch bridge arm, the second branch bridge arm and the third branch bridge arm
It is connected respectively with the anode of power supply, the other end is connected with the cathode of power supply；First resistor is set on the first branch bridge arm, institute
The one end for stating first resistor is connected with the first branch bridge arm, and the other end is connected with the cathode of the power supply；And/or
Second resistance, one end of the second resistance and the second branch bridge arm phase are set on the second branch bridge arm
Even, the cathode of power supply described in the other end is connected；And/or
3rd resistor, one end of the 3rd resistor and the third branch bridge arm phase are set on the third branch bridge arm
Even, the cathode of power supply described in the other end is connected.
In a kind of possible embodiment, the branch of the first resistor or the second resistance or 3rd resistor is detected
Electric current；When the branch current is greater than or equal to default first current value, the permanent magnetic brushless direct-current motor driver is used
Synchronous rectification mode reduces power consumption；When the branch current is less than or equal to default second current value, the brushless, permanently
DC motor driver reduces power consumption using chopping way；Wherein, first current value is greater than second current value.
In a kind of possible embodiment, first current value or second current value are according to the specified electricity of branch
Flow valuve setting.
In a kind of possible embodiment, the circuit further includes the 4th resistance, and the 4th resistance is arranged described
On the cathode main road of power supply；Wherein, one end of the 4th resistance is connected with the cathode of the power supply, the other end respectively with it is described
First resistor, the second resistance and the 3rd resistor are connected.
In a kind of possible embodiment, the main road electric current of the 4th resistance is detected；When the main road electric current is greater than
Or when being equal to default third current value, the permanent magnetic brushless direct-current motor driver reduces power consumption using synchronous rectification mode；
When the main road electric current is less than or equal to default four current value, the permanent magnetic brushless direct-current motor driver uses copped wave side
Formula reduces power consumption；Wherein, the third current value is greater than the 4th current value.
In a kind of possible embodiment, the third current value or the 4th current value are according to the volume of cathode main road
The setting of constant current value.
In a kind of possible embodiment, the circuit includes temperature detection device, and the temperature detection device is used for
The temperature of the first branch bridge arm or the second branch bridge arm or the power tube in the third branch bridge arm is detected, and
The environment temperature when power tube does not work；
When the load stabilization of the circuit, the first branch bridge arm or the second branch bridge arm or described are obtained
The temperature rise value of power tube in three branch bridge arms；Wherein, the temperature rise value of the power tube is that the temperature of the power tube subtracts ring
The temperature in border, and be the first temperature rise value under chopping way, it is the second temperature rise value under synchronous rectification mode；
When the circuit load is stablized, first temperature rise value and second temperature rise value, using lesser temperature
Corresponding mode appreciate to reduce power consumption.
The application second aspect provides a kind of method for optimizing non-brush permanent-magnet DC motor driver losses, is applied to as above
In the circuit, which comprises when the branch current is greater than or equal to default first current value or main road electricity
When stream is greater than or equal to default third current value, the permanent magnetic brushless direct-current motor driver is reduced using synchronous rectification mode
Power consumption；When the branch current is less than or equal to default second current value or the main road electric current less than or equal to default 4th electricity
When flow valuve, the permanent magnetic brushless direct-current motor driver reduces power consumption using chopping way；Wherein, first current value is big
In second current value, the third current value is greater than the 4th current value.
In one possible implementation, when the load stabilization of the circuit, obtain the first branch bridge arm or
The temperature rise value of the second branch bridge arm or the power tube in the third branch bridge arm；Wherein, the temperature rise value of the power tube
The temperature of environment is subtracted for the temperature of the power tube, and is the first temperature rise value under chopping way, under synchronous rectification mode
For the second temperature rise value；When the circuit load is stablized, first temperature rise value and second temperature rise value, use are smaller
Temperature rise value corresponding mode reduce power consumption.
In one possible implementation, first current value or second current value are according to the specified electricity of branch
Stream setting；The third current value or the 4th current value are set according to the load current value of cathode main road.
The application judges to load weight by checking main road electric current or branch current；At light load, it is switched to copped wave side
Formula；It is carried, when overloaded middle, is switched to synchronous rectification mode；And then accomplish that non-brush permanent-magnet DC motor drives in full-load range
Device loss is minimum.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram for non-brush permanent-magnet DC motor driver that the prior art provides；
Fig. 2 is five kinds of optimal way schematic diagrames of the copped wave that the prior art provides；
Fig. 3 is a kind of circuit signal for optimizing non-brush permanent-magnet DC motor driver losses provided in an embodiment of the present invention
Figure；
Fig. 4 is that a kind of method flow for optimizing non-brush permanent-magnet DC motor driver losses provided in an embodiment of the present invention shows
It is intended to.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, the appearance of " first ", " second ", it is only for make to distinguish and description is convenient, should not manage
Solution is the restriction done to the embodiment of the present invention.
Fig. 1 is a kind of circuit diagram for non-brush permanent-magnet DC motor driver that the prior art provides.As shown in Figure 1,
The permanent magnetic brushless direct-current motor driver includes first branch bridge arm, second branch bridge arm and third branch bridge arm, described
One end of first branch bridge arm, the second branch bridge arm and the third branch bridge arm is connected with the anode of power supply respectively,
The other end is connected with the cathode of power supply.First branch bridge arm includes power tube PWM1H and power tube PWM1L, they simultaneously with nothing
The U of brushless motor is extremely connected；Second branch bridge arm includes power tube PWM2H and power tube PWM2L, they simultaneously with it is brushless straight
The V of galvanic electricity machine is extremely connected；Third branch bridge arm power tube PWM3H and PWM3L, their pole W phases with brshless DC motor simultaneously
Even.Power tube is generally metal-oxide-semiconductor.
Fig. 2 is five kinds of optimal way schematic diagrames of the copped wave that the prior art provides.As shown in Fig. 2, the method for copped wave is general
It is H_ON-L_PWM (a), H_PWM-L_ON (b), ON_PWM (c), PWM_ON (d), H_PWM-L_PWM respectively by 5 kinds of modes
(e).(bibliography: influence of five kinds of PWM modes to DC brushless motor system Commutation Torque Ripple；Electric Machines and Control；
In July, 2013).Figure it is seen that preceding four kinds of chopping ways, i.e. a, b, c and d are to pipe other than fifth procedure e
A moment, only one pipe does the on-off of switching frequency, and which reduces on-off times, reduces switching loss.
But although this mode reduces switching loss, due to being still the diode walked when current stream, and the pressure drop of diode is remote
Bigger than the pressure drop of metal-oxide-semiconductor, conduction loss is big.
It should be noted that the loss of power device mainly has switching loss and conduction loss.Others loss, for example drive
The specific gravity very little that dynamic loss etc. accounts for, generally cloth does not consider in loss optimizing.Low-loss direction is dropped also generally all to open from reduction
It closes loss or conduction loss is started with.
That is, switching loss is reduced, the general chopping method with optimization；Conduction loss is reduced, it is general whole with synchronizing
The method of stream.Conduction loss can be reduced by using the technology of synchronous rectification, efficiency is substantially improved.
Synchronous rectification has been widely applied in low pressure, the Switching Power Supply of high current, also there is application in the drive.It uses
Synchronous rectification can reduce conduction loss, but increase switching loss.In the case where middle load and heavy duty, reduce
Conduction loss it is more than increased switching loss, loss whole is to reduce；In the case where underloading, conduction loss reduces unknown
It is aobvious, but switching loss, which increases, does not have significant changes really, it is increased that loss is whole；That is the mode of synchronous rectification, at light load
Overall losses are increased.
The embodiment of the present invention is for the switching between synchronous rectification mode and chopping way, to reduce permanent-magnet DC brushless
The loss of motor driver.It should be noted that being the public affairs of those skilled in the art for synchronous rectification mode and chopping way
Know common sense, the embodiment of the present invention is to this without being described in detail.
Fig. 3 is a kind of circuit signal for optimizing non-brush permanent-magnet DC motor driver losses provided in an embodiment of the present invention
Figure.As shown in figure 3, first resistor 301 is set on the first branch bridge arm, one end of the first resistor 301 and described the
One branch bridge arm is connected, and the other end is connected with the cathode of the power supply；And/or second resistance is set on the second branch bridge arm
302, one end of the second resistance 302 is connected with the second branch bridge arm, and the cathode of power supply described in the other end is connected；With/
Or 3rd resistor 303, one end of the 3rd resistor 303 and the third branch bridge arm phase are set on the third branch bridge arm
Even, the cathode of power supply described in the other end is connected.
At this point, detecting the branch current of the first resistor or the second resistance or 3rd resistor.The weight of load can
To be judged with branch current size.
The current sensing devices such as Hall can be used in the embodiment of the present invention, the current value that will test is sent to controller
(not shown), controller are compared after receiving current value with preset current value, and then are switched and dropped low-loss mode；
The embodiment of the present invention is not construed as limiting the mode of current detecting, the control mode of controller, to this without being described in detail.
When the branch current is greater than or equal to default first current value, the permanent magnetic brushless direct-current motor driver is adopted
Power consumption is reduced with synchronous rectification mode；When the branch current is less than or equal to default second current value, the permanent magnetism without
Brushless motor driver reduces power consumption using chopping way；Wherein, first current value is greater than second current value.
In practice, the fluctuation of electric current has a range, therefore in order to avoid the minor fluctuations of electric current, so as to cause DC permanent-magnetic brushless
The problem of motor driver is beated back and forth between synchronous rectification mode and chopping way, in the first current value and the second current value
Between have a return difference, return difference guarantees that permanent magnetic brushless direct-current motor driver being capable of even running.Such as: the driver is with synchronization
The mode of rectification reduces loss, and branch current value fluctuates near the first current value, even lower than the first current value, at this time will not
Low-loss mode drops in switching, guarantees the driver even running；Until branch current value be less than or equal to the second current value,
When being exactly that branch current value is declined to a certain extent, low-loss mode drops in switching, lowers loss in a manner of copped wave.Instead
It, which is lowered with chopping way is lost, and branch current fluctuates near the second current value, will not switch reduction damage at this time
The mode of consumption；When DC current rises, and is greater than or equal to the first current value, that is, when rising to a certain extent, switching reduces damage
The mode of consumption reduces loss in a manner of synchronous rectification.
In one example, first current value or second current value are set according to the load current value of the branch
It is fixed.Such as: chopping way or synchronous rectification mode can be used in driver for brushless DC motor on startup；It presses upon start up
Chopping way, driver once work together, detection branch electric current, once detect that the first current value is the 30% of rated value
PWM will be sent out wave mode and transform to synchronous rectification mode from chopping way by (user can be set as needed), controller.Together
Reason, if driver works, initial start is in synchronous rectification mode, once detect that current value is the 30%-10%=of rated value
When 20% (30% is setting value, and 10% is return difference, and user can be set as needed), controller will PWM send out wave mode from
Synchronous rectification mode conversion is to chopping way.In this way once having set load point and return difference value, driver is just
It can switch between chopping way and synchronous rectification mode under the control of the controller；Realize underloading work in chopping mode, in
It carries, heavy duty work is in synchronous rectification mode.
In the embodiment of the present invention, the circuit can also include the 4th resistance 304, and the 4th resistance 304 is arranged in institute
It states on the cathode main road of power supply；Wherein, one end of the 4th resistance 304 is connected with the cathode of the power supply, other end difference
It is connected with the first resistor 301, the second resistance 302 and the 3rd resistor 303.
In one example, the circuit can also only have the 4th resistance 304, without first resistor 301, second resistance
302 and 3rd resistor 303.
At this point, the main road electric current of detection the 4th resistance.
When the main road electric current is greater than or equal to default third current value, the permanent magnetic brushless direct-current motor driver is adopted
Power consumption is reduced with synchronous rectification mode；When the main road electric current is less than or equal to default four current value, the permanent magnetism without
Brushless motor driver reduces power consumption using chopping way；Wherein, the third current value is greater than the 4th current value.
It should be noted that the return difference value between third current value and the 4th current value, is set as needed by user.
In one example, the third current value or the 4th current value are set according to the load current value of the main road
It is fixed.
In above-mentioned circuit, the circuit can also include temperature detection device, and the temperature detection device is for detecting
The temperature of the first branch bridge arm or the second branch bridge arm or the power tube in the third branch bridge arm and described
Environment temperature when power tube does not work.
When the load stabilization of the circuit, the first branch bridge arm or the second branch bridge arm or described are obtained
The temperature rise value of power tube in three branch bridge arms.The temperature rise value of the power tube is that the temperature of the power tube subtracts the temperature of environment
Degree；It is the first temperature rise value under chopping way, is the second temperature rise value under synchronous rectification mode；When the circuit load is stablized
When, first temperature rise value and second temperature rise value reduce power consumption using the corresponding mode of lesser temperature rise value.
In other words, when circuit load is stablized, i.e., branch current or main road electric current are stablized in a certain range, when the
When one temperature rise value is greater than the second temperature rise value, the power consumption of power tube is reduced using the corresponding chopping way of the first temperature rise value；When
When one temperature rise value is less than the second temperature rise value, power consumption is reduced using the corresponding synchronous rectification mode of the second temperature rise value.
Fig. 4 is that a kind of method flow for optimizing non-brush permanent-magnet DC motor driver losses provided in an embodiment of the present invention shows
It is intended to.As shown in figure 4, this method is applied in circuit as described above, including step S401-S402.
S401, when the branch current is greater than or equal to default first current value or the main road electric current more than or equal to pre-
If when third current value, the permanent magnetic brushless direct-current motor driver reduces power consumption using synchronous rectification mode.
S402, when the branch current is less than or equal to default second current value or the main road electric current less than or equal to pre-
If when four current values, the permanent magnetic brushless direct-current motor driver reduces power consumption using chopping way；Wherein, described first
Current value is greater than second current value, and the third current value is greater than the 4th current value.
In the above-mentioned methods, when the load stabilization of the circuit, the first branch bridge arm or second described is obtained
The temperature rise value of road and bridge arm or the power tube in the third branch bridge arm.The temperature rise value of the power tube is the temperature of the power tube
Degree subtracts the temperature of environment, and is the first temperature rise value under chopping way, is the second temperature rise value under synchronous rectification mode.
When the circuit load is stablized, first temperature rise value and second temperature rise value, using lesser temperature
Corresponding mode appreciate to reduce power consumption.
Unaccomplished matter in the embodiment of the present invention is detailed in shown in Fig. 3 and word segment, is not repeating herein.
The embodiment of the present invention judges to load weight by checking bus current or bridge arm current；At light load, it is switched to
Chopping way；It is carried, when overloaded middle, is switched to synchronous rectification mode；And then accomplish permanent-magnet DC brushless electricity in full-load range
Machine driver losses are minimum.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of circuit for optimizing non-brush permanent-magnet DC motor driver losses, is applied to permanent magnetic brushless direct-current motor driver
In, the permanent magnetic brushless direct-current motor driver includes first branch bridge arm, second branch bridge arm and third branch bridge arm, institute
State one end of first branch bridge arm, the second branch bridge arm and the third branch bridge arm respectively with the positive phase of power supply
Even, the other end is connected with the cathode of power supply；It is characterized in that,
First resistor is set on the first branch bridge arm, one end of the first resistor is connected with the first branch bridge arm,
The other end is connected with the cathode of the power supply；And/or
Second resistance is set on the second branch bridge arm, one end of the second resistance is connected with the second branch bridge arm,
The other end is connected with the cathode of the power supply；And/or
3rd resistor is set on the third branch bridge arm, one end of the 3rd resistor is connected with the third branch bridge arm,
The other end is connected with the cathode of the power supply；And/or
The circuit further includes the 4th resistance, and the 4th resistance is arranged on the cathode main road of the power supply；Wherein, described
One end of four resistance is connected with the cathode of the power supply, the other end respectively with the first resistor, the second resistance and institute
3rd resistor is stated to be connected；
Detect the branch current of the first resistor or the second resistance or 3rd resistor；Or, detection the 4th resistance
Main road electric current；
When the branch current is greater than or equal to default first current value or the main road electric current more than or equal to default third electricity
When flow valuve, the permanent magnetic brushless direct-current motor driver reduces power consumption using synchronous rectification mode；
When the branch current is less than or equal to default second current value or the main road electric current less than or equal to default 4th electricity
When flow valuve, the permanent magnetic brushless direct-current motor driver reduces power consumption using chopping way；Wherein, first current value is big
In second current value, the third current value is greater than the 4th current value；
The circuit includes temperature detection device, and the temperature detection device is for detecting the first branch bridge arm or described the
Environment temperature when the temperature and the power tube of two branch bridge arms or the power tube in the third branch bridge arm do not work
Degree；
When the load stabilization of the circuit, the first branch bridge arm or the second branch bridge arm or the third branch are obtained
The temperature rise value of power tube in road and bridge arm；Wherein, the temperature rise value of the power tube is that the temperature of the power tube subtracts environment
Temperature, and be the first temperature rise value under chopping way, it is the second temperature rise value under synchronous rectification mode；
When the circuit load is stablized, first temperature rise value and second temperature rise value, using lesser temperature rise value
Corresponding mode reduces power consumption.
2. circuit according to claim 1, which is characterized in that first current value or second current value are according to branch
The load current value on road is set.
3. circuit according to claim 1, which is characterized in that the third current value or the 4th current value are according to negative
The load current value of pole main road is set.
4. a kind of method for optimizing non-brush permanent-magnet DC motor driver losses, which is characterized in that be applied to such as claim 1-3
In circuit described in any one, which comprises
When the branch current is greater than or equal to default first current value or the main road electric current more than or equal to default third electricity
When flow valuve, the permanent magnetic brushless direct-current motor driver reduces power consumption using synchronous rectification mode；
When the branch current is less than or equal to default second current value or the main road electric current less than or equal to default 4th electricity
When flow valuve, the permanent magnetic brushless direct-current motor driver reduces power consumption using chopping way；Wherein, first current value is big
In second current value, the third current value is greater than the 4th current value.
5. according to the method described in claim 4, it is characterized in that,
When the load stabilization of the circuit, the first branch bridge arm or the second branch bridge arm or the third branch are obtained
The temperature rise value of power tube in road and bridge arm；Wherein, the temperature rise value of the power tube is that the temperature of the power tube subtracts environment
Temperature, and be the first temperature rise value under chopping way, it is the second temperature rise value under synchronous rectification mode；
When the circuit load is stablized, first temperature rise value and second temperature rise value, using lesser temperature rise value
Corresponding mode reduces power consumption.
6. according to the method described in claim 4, it is characterized in that, first current value or second current value are according to branch
The load current value on road is set；The third current value or the 4th current value are set according to the load current value of cathode main road
It is fixed.
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