CN103259468B - Motor drive circuit and there is the motor unit of this motor drive circuit - Google Patents
Motor drive circuit and there is the motor unit of this motor drive circuit Download PDFInfo
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- CN103259468B CN103259468B CN201310011504.9A CN201310011504A CN103259468B CN 103259468 B CN103259468 B CN 103259468B CN 201310011504 A CN201310011504 A CN 201310011504A CN 103259468 B CN103259468 B CN 103259468B
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- 239000003990 capacitor Substances 0.000 claims abstract description 79
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- 238000012163 sequencing technique Methods 0.000 claims description 46
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 15
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Abstract
This application discloses a kind of motor drive circuit and have the motor unit of this motor drive circuit, wherein said motor drive circuit has inverter circuit and control circuit.Inverter circuit coil in motor provides electric power.Inverter circuit has upper arm side switch element and underarm side switch element.Upper arm side switch element is connected to be applied with between the terminal of motor voltage and coil.Underarm side switch element is connected between upper arm side switch element and ground wire.Control circuit has switching controlling part and boottrap capacitor.Switching controlling part makes the switch element included by inverter circuit switch to connect or disconnect with reference to from speed instruction voltage and the detection signal of outside input.Boottrap capacitor can store the electric power for driving upper arm side switch element.When speed instruction voltage reaches more than predetermined voltage, switching controlling part performs the charging of the boottrap capacitor of the scheduled time.
Description
Technical field
The present invention relates to a kind of motor drive circuit and there is the motor unit of this motor drive circuit.
Background technology
Brushless DC motor can be by being provided driving voltage and action from inverter circuit.Japanese Kokai
2003-158887 publication discloses a kind of inverter circuit providing driving voltage to brushless DC motor.Inverter circuit
There is multiple switch element for providing voltage to each coil of brushless DC motor.The type of drive of switch element has
ROM BOOT mode.ROM BOOT mode connects at multiple switch elements respectively capacitor, thus by being stored in electricity
The electric charge of container makes switching elements ON.
Summary of the invention
In general ROM BOOT mode, the structure as the countermeasure of reply interference is less.Such as, it is being arranged on sky
In the motor of the off-premises station adjusted, when not to inverter circuit input speed command signal, when the output with motor
When the impeller that axle connects rotates due to wind etc., motor carries out generating action.The produced regenerative voltage of motor generating carries
Supply inverter circuit, thus likely the voltage of inverter circuit rises.
Motor drive circuit disclosed in the present application has inverter circuit and control circuit.Inverter circuit is to being arranged on motor
In coil provide electric power.Inverter circuit has upper arm side switch element and underarm side switch element.Upper arm side switch unit
Part is connected to be applied with between the terminal of motor voltage and coil.Underarm side switch element is connected to upper arm side switch element
And between ground wire.Control circuit has switching controlling part and boottrap capacitor.Switching controlling part is with reference to from outside input
Speed instruction voltage and detection signal make the switch element included by inverter circuit switch to connect or disconnect.Bootstrapping electricity
Container can store the electric power for driving upper arm side switch element.When speed instruction voltage reaches more than predetermined voltage
Time, switching controlling part carries out the charging of the boottrap capacitor of the scheduled time.
Motor drive circuit disclosed in the present application, its switching controlling part calculates the speed of motor, and compares rotary frequency
Rate and predetermined speed.When speed is not up to predetermined speed, carry out the charging of boottrap capacitor.
Motor drive circuit disclosed in the present application, its switching controlling part calculates speed with reference to the induced voltage of motor,
And compare speed and predetermined speed.When speed is not up to predetermined speed, carry out bootstrap capacitor
The charging of device.
Motor drive circuit disclosed in the present application, its switching controlling part have PWM signal generation section, sequencing contro portion,
Power on signal forming portion and drive circuit.PWM signal generation section generates pwm signal from speed command signal.Time
Sequence control portion adjusts the sequential of pwm signal.Power on signal forming portion is with reference to from the PWM letter of sequencing contro portion output
Number generate power on signal.Drive circuit uses the power on signal and makes upper arm side switch element and the switching of underarm side switch element
One-tenth connects or disconnects.
Motor drive circuit disclosed in the present application, its drive circuit has upper arm side ON-OFF control circuit, underarm side switch
Control circuit and boottrap capacitor.Upper arm side ON-OFF control circuit makes upper arm side switch element switch to connect or disconnected
Open.Underarm side ON-OFF control circuit makes underarm side switch element switch to connect or disconnect.
Motor unit disclosed in the present application has motor, inverter circuit and control circuit.Motor includes having the quiet of coil
Stop and be supported for the rotating part that can rotate by stationary part.Inverter circuit has upper arm side switch element and underarm side is opened
Close element.Upper arm side switch element is connected to be applied with between the terminal of motor voltage and coil.Underarm side switch element
It is connected between upper arm side switch element and ground wire.Control circuit has switching controlling part and boottrap capacitor.Switch control
Portion processed makes the switch element included by inverter circuit switch with reference to from speed instruction voltage and the detection signal of outside input
One-tenth connects or disconnects.Boottrap capacitor can store the electric power for driving upper arm side switch element.Work as speed command
When voltage reaches more than predetermined voltage, switching controlling part carries out the charging of the boottrap capacitor of the scheduled time.
Motor unit disclosed in the present application, its motor has position detection part.The rotation of position detection part detection rotating part
Position output detections signal.Switching controlling part utilizes detection signal to calculate speed, and compares speed with pre-
Determine speed.When speed is not up to predetermined speed, carry out the charging of boottrap capacitor.
Motor unit disclosed in the present application also has induced voltage test section.The detection of induced voltage test section is produced in stationary part
Raw induced voltage.Switching controlling part utilizes the induced voltage detected by induced voltage test section to calculate rotary frequency
Rate, and compare speed and predetermined speed.When speed is not up to predetermined speed, boot
The charging of capacitor.
Motor unit disclosed in the present application, its switching controlling part has PWM signal generation section, sequencing contro portion, leads to
Signal of telecommunication forming portion and drive circuit.PWM signal generation section generates pwm signal from speed command signal.Sequential
Control portion adjusts the sequential of pwm signal.Power on signal forming portion is with reference to the pwm signal from the output of sequencing contro portion
Generate power on signal.Drive circuit uses the power on signal makes upper arm side switch element and underarm side switch element switch to
Connect or disconnect.
Motor unit disclosed in the present application, its drive circuit includes upper arm side ON-OFF control circuit, underarm side on-off control
Circuit and boottrap capacitor.Upper arm side ON-OFF control circuit makes upper arm side switch element switch to connect or disconnect.Under
Arm side ON-OFF control circuit makes underarm side switch element switch to connect or disconnect.
The embodiment illustrated according to the application, even if motor has carried out generating action due to interference, it is also possible to anti-
Only inverter circuit is applied high voltage.
Accompanying drawing explanation
Fig. 1 is the block diagram of the motor unit involved by present embodiment.
Fig. 2 is the circuit diagram of the inverter circuit involved by present embodiment and drive circuit.
Fig. 3 is the flow chart of the motor unit involved by present embodiment.
Fig. 4 is the sequential chart of the motor unit involved by present embodiment.
Fig. 5 is the variation of the motor unit involved by present embodiment.
Detailed description of the invention
<embodiment 1>
1. the structure of motor drive circuit
Fig. 1 is the block diagram of the motor unit involved by an embodiment of this enforcement.Motor unit have motor 1,
Inverter circuit 2 and control circuit 3.Control circuit 3 makes inverter circuit 2 action.Inverter circuit 2 carries to motor 1
For driving voltage.Motor unit has shunt resistance R1.
Motor 1 for example, brushless DC motor.Motor 1 has stationary part and rotating part.Stationary part includes stator core
With coil etc..Rotating part includes rotor core, Magnet and axle etc..Motor 1 has the rotation position for detecting rotating part
The sensor 4 put.
Inverter circuit 2 has switch element.Inverter circuit 2 also can have such as transistor, field-effect transistor (FET)
With insulated gate bipolar transistor (IGBT) as switch element.In the present embodiment, as switch element one
Individual example, inverter circuit 2 has field-effect transistor.The quantity of switch element is preferably the number of phases with motor 1 and becomes ratio
The number of example.Such as when motor 1 is three-phase motor, inverter circuit 2 preferably has six switch elements.In this reality
Executing in mode, owing to motor 1 is the brushless DC motor of three-phase, therefore inverter circuit 2 has six switch elements.
Control circuit 3 has triangular wave oscillating circuit 31, comparator 32, PWM signal generation section 33, sequential control
Portion 34 processed, power on signal forming portion 35, drive circuit 36, comparator 37, position detection part 38 and charging control
Portion 39 processed.Control circuit 3 can be constituted by controlling IC.Control circuit 3 can be by being provided with from controlling power supply
The control voltage vcc of direct current that theres is provided and drive.Control circuit 3 is applied with the speed being externally controlled the transmissions such as device
Command voltage Vsp.Control circuit 3 makes motor 1 action with the speed following speed instruction voltage Vsp.
Triangular wave oscillating circuit 31 exports triangular wave (sawtooth waveforms) signal.
Comparator 32 compares the triangular signal sent from triangular wave oscillating circuit 31 and the speed command from outside input
Voltage Vsp.
PWM signal generation section 33 generates pwm signal from the comparative result exported by comparator 32.Specifically,
PWM signal generation section 33 generates pulse signal with reference to the comparative result that exports from comparator 32, this pulse signal with
During period bigger than triangular wave for speed instruction voltage Vsp is for connecting, less than triangular wave with speed instruction voltage Vsp
Period for disconnect during.
Sequencing contro portion 34 adjusts with reference to the rotating position signal exported from position detection part 38 and generates from pwm signal
The sequential (such as rising edge sequential) of the pwm signal of portion 33 output.Shunting electricity can detect in sequencing contro portion 34
The terminal voltage of resistance R1, thus calculate the value of the electric current flowing through inverter circuit 2.
Power on signal forming portion 35 generates for driving switch unit based on the pwm signal adjusted by sequencing contro portion 34
The power on signal of part 6.The power on signal of generation is exported drive circuit 36 by power on signal forming portion 35.
Drive circuit 36, with reference to the power on signal exported from power on signal forming portion 35, can control inverter circuit 2
The signal of switching elements ON/disconnection be sent to inverter circuit 2.Specifically, drive circuit 36 is with reference to from logical
The power on signal of signal of telecommunication forming portion 35 output generates control signal, and this control signal is applied respectively to inverter circuit 2
Six included switch elements.The control signal of generation is sent to included by inverter circuit 2 by drive circuit 36
Six switch elements.
Position detection part 38 is with reference to the rotation of the rotating part included by the detection signal detection motor 1 exported from sensor 4
Indexing is put.The information of the position of rotation of the rotating part detected is sent by position detection part 38 as rotating position signal
To sequencing contro portion 34.
Charging control section 39 controls the charging action carrying out boottrap capacitor C1～C3 included by drive circuit 36.
Specifically, the positional information detected by charging control section 36 reference position test section 38, generate with scheduled timing
The charging control signal that boottrap capacitor C1～C3 is charged.
Sensor 4 is included in motor 1, and is arranged in the vicinity of rotating part.Sensor 4 preferably includes multiple sensing
Device element, includes three sensor elements in the present embodiment.Sensor element included by sensor 4 according to
The interval configuration of the electric angle of 120 degree centered by the rotary shaft of rotating part.Sensor 4 can detect the rotation of rotating part
Position.Sensor 4 such as can be realized by the Magnetic Sensor of the magnetic flux of the Magnet included by detection rotating part.Example
As, use Hall element as Magnetic Sensor.It addition, the number of sensor 4 is three in the present embodiment, but
It is not limited to this.The position of sensor 4 is the interval configuration of the electric angle according to 120 degree in the present embodiment, but
It is not limited to this.
Fig. 2 is inverter circuit 2 and the circuit diagram of drive circuit 36.As in figure 2 it is shown, inverter circuit 2 has six
Individual switch element Q1～Q6.It addition, in this manual, switch element Q1, Q3, Q5 are referred to as " upper arm ",
Switch element Q2, Q4, Q6 are referred to as " underarm ".Drive circuit 36 have the first upper arm drive circuit 36a,
One underarm drive circuit 36b, the second upper arm drive circuit 36c, the second underarm drive circuit 36d, the 3rd upper arm drive
Galvanic electricity road 36e, the 3rd underarm drive circuit 36f, diode D1～D3, current-limiting resistance R11～R13 and bootstrapping
Capacitor C1～C3.Drain electrode at switch element Q1, Q3, Q5 is applied with motor voltage Vm.At switch element
In Q1, grid and the first upper arm drive circuit 36a connect, source electrode and the U phase coil of motor 1 and switch element
The drain electrode of Q2 connects.In switch element Q2, grid and the first underarm drive circuit 36b connect, source ground.
In switch element Q3, grid and the second upper arm drive circuit 36c connect, the V phase coil of source electrode and motor 1 with
And the drain electrode of switch element Q4 connects.In switch element Q4, grid and the second underarm drive circuit 36d connect,
Source ground.In switch element Q5, grid and the 3rd upper arm drive circuit 36e connect, source electrode and motor 1
The drain electrode of W phase coil and switch element Q6 connects.In switch element Q6, grid and the 3rd underarm drive electricity
Road 36f connects, source ground.
Terminal UH and the first upper arm drive circuit 36a connects.Terminal UL and the first underarm drive circuit 36b connects.
Terminal VH and the second upper arm drive circuit 36c connects.Terminal VL and the second underarm drive circuit 36d connects.End
Sub-WH and the 3rd upper arm drive circuit 36e connects.Terminal WL and the 3rd underarm drive circuit 36f connects.Opposite end
Sub-UH～WL input is from the power on signal of power on signal forming portion 35 output.
Current-limiting resistance R11 is connected with the anode of diode D1.Current-limiting resistance R12 is connected with the anode of diode D2.
Current-limiting resistance R13 is connected with the anode of diode D3.Current-limiting resistance R11～R13 by boottrap capacitor C1～
The initial stage charging current of C3 prevented the generation that ductility limit system operates.
Boottrap capacitor C1 is connected between the source electrode of diode D1 and switch element Q1.Boottrap capacitor C2 is even
It is connected between the source electrode of diode D2 and switch element Q3.Boottrap capacitor C3 is connected to diode D3 and switch
Between the source electrode of element Q5.Diode D1～D3 is connected with control voltage input-terminal.Therefore, when switch unit
Part Q1 disconnects, and when switch element Q2 connects, boottrap capacitor C1 charges.Further, when switch element Q3 disconnects,
When switch element Q4 connects, boottrap capacitor C2 charges.Further, when switch element Q5 disconnects, switch element
When Q6 connects, boottrap capacitor C3 charges.
2. the action of motor unit
The run action of 2-1. motor unit
Fig. 3 is the flow chart of the action illustrating motor unit.Hereinafter, with reference to Fig. 3, the action of motor unit is said
Bright.It addition, the flow process shown in Fig. 3 is Vsp input terminal 40 not to be applied with speed instruction voltage Vsp and horse
Premised on reaching 1 stopping, and the charging action stopping of boottrap capacitor.Further, as an example, this embodiment party
The motor unit of formula is the motor of the fan rotation of the off-premises station making to be equipped on air-conditioning.Therefore, the axle at motor 1 connects
There is impeller as load.It addition, off-premises station order based on the indoor set from air-conditioning and action.
The indoor set of air-conditioning receive from remote controller etc. include making power supply after disconnecting the signal of order switching to connect,
To peripheral control unit sending action order.After peripheral control unit receives action command, by speed instruction voltage Vsp
It is applied to the Vsp input terminal 40(S1 of motor unit).
It follows that sequencing contro portion 34 compares speed instruction voltage Vsp and reference voltage V th.Sequencing contro portion 34
Continue executing with comparison (S2).
Charging control section 39 is with reference to the rotating position signal sent from position detection part 38, thus calculates the rotation of motor 1
Speed f of transfer part.Charging control section 39 compares speed f and reference frequency fth calculated.Charging controls
The comparative result of frequency is sent to sequencing contro portion 34 as charging control signal by portion 39.It addition, reference voltage
As long as Vth is the value being capable of detecting when to be applied with speed instruction voltage Vsp, the most as an example
It is 2.1 volts (S3).
Sequencing contro portion 34 with reference to charging control signal judge speed f when being not up to reference frequency fth (at S3
In be judged as "Yes"), make the charging of boottrap capacitor C1～C3 included by drive circuit 36 start.It addition, base
As long as the value that the spinning movement that quasi-frequency fth is the rotating part being capable of detecting when motor 1 stops, this embodiment party
Formula it is 1 hertz as an example.Further, the speed of not up to reference frequency fth includes the rotation of motor 1
Speed (0 hertz) when transfer part stops.Further, sequencing contro portion 34 has timer, from starting bootstrapping electricity
The sequential of the charging of container C1～C3 starts timing (S4).
Specifically, the order that the upper arm made in inverter circuit 2 disconnection is made underarm connect by sequencing contro portion 34 is sent out
Give power on signal forming portion 35.Power on signal forming portion 35 generates based on the order from sequencing contro portion 34
Make UH signal, VH signal and WH signal that the upper arm of inverter circuit 2 disconnects, and generation makes inverter circuit 2
Underarm connect UL signal, VL signal and WL signal.The signal of generation is sent out by power on signal forming portion 35
Give drive circuit 36.
First upper arm drive circuit 36a makes the grid voltage of switch element Q1 decline, so that switch element Q1 breaks
Open.Second upper arm drive circuit 36c makes the grid voltage of switch element Q3 decline, so that switch element Q3 breaks
Open.3rd upper arm drive circuit 36e makes the grid voltage of switch element Q5 decline, so that switch element Q5 breaks
Open.First underarm drive circuit 36b makes the grid voltage of switch element Q2 rise, so that switch element Q2 connects
Logical.Second underarm drive circuit 36d makes the grid voltage of switch element Q4 rise, so that switch element Q4 connects
Logical.3rd underarm drive circuit 36f makes the grid voltage of switch element Q6 rise, so that switch element Q6 connects
Logical.
By switch element Q1 and Q2 action as described above, owing to the drain electrode of switch element Q2 becomes low electricity
Position, therefore electric current based on control voltage vcc flows through diode D1, boottrap capacitor C1 and switch element Q2,
Thus boottrap capacitor C1 is electrically charged.Further, by switch element Q3 and Q4 action as described above, due to
The drain electrode of switch element Q4 becomes electronegative potential, therefore electric current based on control voltage vcc flow through diode D2,
Boottrap capacitor C2 and switch element Q4, thus boottrap capacitor C2 is electrically charged.Further, switch element is passed through
Q5 and Q6 action as described above, owing to the drain electrode of switch element Q6 becomes electronegative potential, therefore based on controlling to use
The electric current of voltage vcc flows through diode D3, boottrap capacitor C3 and switch element Q6, thus boottrap capacitor
C3 is electrically charged.
Sequencing contro portion 34 judges whether the charging interval of boottrap capacitor C1～C3 have passed through the predetermined charging interval.
It addition, the predetermined charging interval is preferably the shortest of the charging complete (reaching fully charged) of bootstrapping charger C1～C3
Time.The capacity of boottrap capacitor C1～C3 is the biggest, and the predetermined charging interval is the longest, and capacity is the least, and predetermined fills
The electricity time is the shortest.In an example of present embodiment, the predetermined charging interval is 1.5 milliseconds (S5).
If sequencing contro portion 34 judge the charging interval of boottrap capacitor C1～C3 have passed through predetermined charging interval (
S5 is judged as "Yes"), then make the charging of boottrap capacitor C1～C3 stop.Specifically, sequencing contro portion 34
Release the state (S6) making the upper arm in inverter circuit 2 disconnect and to make underarm connect.
Sequencing contro portion 34 makes switch element Q1～Q6 of inverter circuit 2 connect or disconnect successively, carries out inversion
Control.Inverter circuit 2 performs inversion control, so that motor 1 continues to run with (S7).
Hereinafter, the concrete run action of motor unit is illustrated.
Comparator 32 compares speed instruction voltage Vsp and the triangular wave oscillating circuit being applied to Vsp input terminal 40
31 triangular waves sent, and comparative result is sent to PWM signal generation section 33.PWM signal generation section 33
Pwm signal is generated based on the comparative result sent by comparator 32.Specifically, only send at speed command
The period of the value that voltage Vsp exceedes triangular wave becomes the pulse signal of high level.That is, comparator 32 and PWM
Signal generating unit 33 carries out PWM control, and the level of generation and speed instruction voltage Vsp correspondingly carries out pulse
The pulse signal that width (dutycycle) is modulated.Pwm signal (pulse signal) is sent out by PWM signal generation section 33
Give sequencing contro portion 34.
Sequencing contro portion 34 with reference to pwm signal and the position signalling that sent by position detection part 38 to control PWM
The rising edge sequential of signal.Pwm signal is sent to power on signal forming portion 35 by sequencing contro portion 34.
Power on signal forming portion 35 generates the power on signal corresponding with the three-phase coil of motor 1 with reference to pwm signal.
Specifically, power on signal forming portion 35 generates UH signal and UL signal, the VH signal of V phase of U phase
And the WH signal of VL signal, W phase and WL signal.The signal of generation is sent out by power on signal forming portion 35
Give drive circuit 36.It addition, UH signal, VH signal and WH signal are for making inverter circuit 2
The signal of arm action.UL signal, VL signal and WL signal are the underarm action for making inverter circuit 2
Signal.UH signal, VH signal and WH signal mutually have the phase contrast of such as 120 degree.UL signal,
VL signal and WL signal mutually have the phase contrast of such as 120 degree.
UH signal is input to the first upper arm drive circuit 36a of drive circuit 36.First upper arm drive circuit 36a base
Gate turn-on or the disconnection of switch element Q1 is made in UH signal.UL signal is input to the of drive circuit 36
One underarm drive circuit 36b.First underarm drive circuit 36b makes the grid of switch element Q2 connect based on UL signal
Lead to or disconnect.VH signal is input to the second upper arm drive circuit 36c of drive circuit 36.Second upper arm drives electricity
Road 36c makes gate turn-on or the disconnection of switch element Q3 based on VH signal.VL signal is input to drive circuit
The second underarm drive circuit 36d of 36.Second underarm drive circuit 36d makes switch element Q4's based on VL signal
Gate turn-on or disconnection.WH signal is input to the 3rd upper arm drive circuit 36e of drive circuit 36.3rd upper arm
Drive circuit 36e makes gate turn-on or the disconnection of switch element Q5 based on WH signal.WL signal is input to drive
The 3rd underarm drive circuit 36f on galvanic electricity road 36.3rd underarm drive circuit 36f makes switch element based on WL signal
The gate turn-on of Q6 or disconnection.
Inverter circuit 2 can pass through optionally to make switch element Q1～Q6 switch on and off, and three to motor 1
Phase coil is energized, so that the rotating part of motor 1 rotates.Such as, by making switch element Q1 and Q4 connect,
Electric current based on motor voltage Vm flows through switch element Q1, U phase coil, switch element Q4 successively.Further, logical
Crossing and be energized switch element Q3 and Q6, electric current based on motor voltage Vm flows through switch element Q3, V successively
Phase coil, switch element Q6.Further, by switch element Q5 and Q2 is energized, based on motor voltage Vm
Electric current flow through switch element Q5, W phase coil, switch element Q2 successively.
The sequential electric discharge that boottrap capacitor C1 connects at switch element Q1.Boottrap capacitor C2 is at switch element Q3
The sequential electric discharge connected.The sequential electric discharge that boottrap capacitor C3 connects at switch element Q5.
And the sequential charging that boottrap capacitor C1 connects at switch element Q2.Boottrap capacitor C2 is at switch element
The sequential charging that Q4 connects.The sequential charging that boottrap capacitor C3 connects at switch element Q5.Further, since open
Close the sequential that element Q2, Q4, Q6 connect and there is the phase contrast of 120 degree, therefore boottrap capacitor C1～C3 with
120 degree of cycle chargings.
By inverter circuit 2 action as described above, the rotating part of motor 1 is with corresponding to speed instruction voltage Vsp
Rotary speed rotate.
Fig. 4 is to illustrate the run action of motor 1 involved by present embodiment and filling of boottrap capacitor C1～C3
The sequential chart of electronic work.Fig. 4 (a) is expression during the rotating position signal from position detection part 38 output, a high position
Sensor 4 detects the period of the magnetic flux of Magnet.Fig. 4 (b) is the charging control signal of charging control section 39 output,
It it is the period of the charging carrying out boottrap capacitor C1～C3 during a high position.Fig. 4 (c) illustrates speed instruction voltage Vsp.
In the diagram, the indoor set of air-conditioning receives from remote controller etc. and includes making power supply from disconnecting the order that is switched on
After signal, action command is sent to peripheral control unit.After peripheral control unit receives action command, by speed command
Voltage Vsp is applied to Vsp input terminal 40(sequential t1 of motor unit).
Sequencing contro portion 34 compares speed instruction voltage Vsp and reference voltage V th, if judging speed instruction voltage Vsp
Exceed reference voltage V th, then make underarm (switch element Q2, Q4, the Q6 shown in Fig. 2) connect, thus boot
Capacitor C1～C3 starts to charge up.(sequential t2)
Sequential t2 that sequencing contro portion 34 starts to charge up from boottrap capacitor C1～C3 starts timing.When from sequential t2
After having begun to pass through scheduled time T set in advance, sequencing contro portion 34 makes the charging of boottrap capacitor C1～C3
Stop (sequential t3).
Sequencing contro portion 34, after sequential t3, carries out inversion control to inverter circuit 2.Inverter circuit 2 is in sequential
After t3, carry out inversion control, so that motor 1 brings into operation.
The action when load rotates because of external factor of the 2-2. motor unit
The off-premises station of air-conditioning is arranged without mostly.In such off-premises station, when motor off-duty, if wind etc. blow
If impeller (load), then impeller can rotate.Under the off-duty state of motor 1, if impeller due to outside because of
Element (wind etc.) and rotate if, then the rotating part of the motor 1 being connected with impeller also rotates.If rotating part rotates,
Then the stationary part at motor 1 produces regenerative voltage.
In the present embodiment, one of its feature is, as it is shown on figure 3, include the step of monitoring velocity command voltage Vsp
Suddenly the step (S3) of speed f of (S2) and monitoring motor 1.I.e., in the present embodiment, refer to when speed
Voltage Vsp is made to reach more than reference voltage V th, when speed f of motor 1 is higher than reference frequency fth, bootstrapping
Capacitor C1～C3 does not charges.It is to say, when impeller rotates due to external factor, apply speed
During command voltage Vsp, boottrap capacitor C1～C3 does not charges.By such structure, impeller due to outside because of
Element (wind etc.) and when making motor 1 run under the state that rotates, owing to boottrap capacitor C1～C3 does not charges, therefore
The voltage being prevented from inverter circuit 2 is substantially increased.
Such as, in there is no the flow process of step of monitoring velocity command voltage Vsp, when impeller due to outer thus when rotating,
Motor unit is applied with speed instruction voltage Vsp, if speed instruction voltage Vsp exceedes reference voltage V th, then certainly
Act capacitor charges.During boottrap capacitor charging, underarm (switch element Q2, Q4, the Q6 shown in Fig. 2) is connected.
After underarm is connected, the node of switch element Q1 and Q2, the node of switch element Q3 and Q4, switch element
Voltage at the node of Q5 and Q6 rises, thus the rotating part in rotating is applied braking.Now, when due to
When outer thus that the rotate rotary speed of rotating part is fast, the stationary part at motor 1 is applied with the regenerative voltage that value is high, from
And the motor voltage Vm of inverter circuit 2 raises.If motor voltage Vm exceedes the pressure of inverter circuit 2, then switch
Element is the most damaged.
The action after motor stops because of external factor of the 2-3. motor unit
When motor unit runs, when cutting off the power supply to motor unit, then speed instruction voltage Vsp, control electricity consumption
Pressure Vcc and motor voltage Vm dramatic decrease.
In the present embodiment, one of its feature is, as it is shown on figure 3, include the step of monitoring velocity command voltage Vsp
Suddenly the step (S3) of speed f of (S2) and monitoring motor 1.I.e., in the present embodiment, refer to when speed
Voltage Vsp is made to reach more than reference voltage V th, when speed f of motor 1 is higher than reference frequency fth, bootstrapping
Capacitor C1～C3 does not charges.By such structure, when being applied with speed control signal Vsp, if to horse
The power supply reaching unit is cut-off and time the rotating part of motor 1 rotates due to inertia etc., boottrap capacitor C1～C3 is not
Charging.Therefore, it is possible to prevent the voltage of inverter circuit 2 to be substantially increased.
Such as, in the step of speed f of the step and monitoring motor 1 not having monitoring velocity command voltage Vsp
Flow process in, when motor 1 runs, power supply is cut-off, and speed instruction voltage Vsp drops to charging keying level,
Thus carry out the charging of boottrap capacitor.When boottrap capacitor charges, underarm (the switch element Q2 shown in Fig. 2,
Q4, Q6) connect.Underarm is connected, then the node of switch element Q1 and Q2, switch element Q3 and Q4
Node, switch element Q5 and Q6 node at voltage raise, thus the rotating part of motor 1 is applied with
Braking.Now, when rotating part rotary speed will apply braking time height in the case of, in the stationary part of motor 1
The regenerative voltage produced raises.If regenerative voltage raises, then the motor voltage Vm of inverter circuit 2 raises.If motor
Voltage Vm exceedes the pressure of inverter circuit 2, then switch element is the most damaged.
3. the effect of embodiment and other
Motor unit involved by present embodiment is in the step driving flow process to include monitoring velocity command voltage Vsp
And the step (S3) of speed f of rotating part of monitoring motor 1 (S2).Motor unit is at speed instruction voltage
Vsp reaches more than reference voltage V th, when speed f is not up to reference frequency fth, and boottrap capacitor C1～C3
Charging.By such structure, when the loads such as the impeller being connected with motor 1 rotate due to external factor such as wind,
Even if being applied with speed instruction voltage Vsp, also due to boottrap capacitor C1～C3 does not charges, and it is prevented from horse
Reach the 1 high regenerative voltage of generation.Therefore, it is possible to prevent the voltage in inverter circuit 2 from rising, thus prevent inverter circuit
Switch element included by 2 is damaged.
Further, even if motor 1 is in operation it is de-energized, speed instruction voltage Vsp thus dramatic decrease, it is also possible to by
It is electrically charged in boottrap capacitor C1～C3 and prevents from producing high regenerative voltage at motor 1.Therefore, it is possible to prevent inversion
Voltage in circuit 2 rises such that it is able to prevent the switch element included by inverter circuit 2 damaged.
Further, in the present embodiment, when sequencing contro portion 34 has the charging monitoring boottrap capacitor C1～C3
Between timer.Thus, sequencing contro portion 34 is owing to will be construed as limiting the charging electric of boottrap capacitor C1～C3
Power consumption can be reduced in the scheduled time.
It addition, in the present embodiment, the charging interval of boottrap capacitor C1～C3 is 1.5 milliseconds, this value be
The shortest in order to ensure needed for necessary charge volume when the capacity of boottrap capacitor C1～C3 is 1 microfarad (example)
Time.Necessary charge volume is not limited to fully charged, it is possible to shorten the charging interval (such as 0.5 millisecond etc.) wittingly.
Further, in the present embodiment, sensor 4 is employed in order to detect the speed of the rotating part of motor 1,
But it is alternatively detection and at the induced voltage of motor 1 generation thus detects the structure of the speed of rotating part.Fig. 5 illustrates
The variation of the motor unit involved by present embodiment.Motor unit shown in Fig. 5 is at the motor list shown in Fig. 1
Unit also has testing circuit 41.Testing circuit 41 can detect the induced voltage produced at motor 1.Testing circuit
The value of the induced voltage detected is sent to position detection part 38 by 41.Position detection part 38 is from by testing circuit 41
The frequency of the value detection induced voltage of the induced voltage sent.The frequency of induced voltage is sent to by position detection part 38
Sequencing contro portion 34.Sequencing contro portion 34 compares frequency and the reference voltage frequency of induced voltage.When induced voltage
When frequency ratio reference voltage frequency is low, sequencing contro portion 34 judges that the rotating part of motor 1 stops.Sequencing contro portion 34
Will determine that the judgment standard of judgement step S3 that result is used as in Fig. 3.
Further, control circuit 3 is alternatively when the charge volume of boottrap capacitor C1～C3 is not up to predetermined value, to
The structure of the coil power supply that each boottrap capacitor C1～C3 connects.Such structure can be by having under-voltage protection
Circuit and realize.
Further, motor drive circuit can be formed as including having the encapsulation IC of control circuit 3 and having inverter circuit
The structure of the encapsulation IC of 2.Further, motor drive circuit can have and includes inverter circuit 2 and control circuit 3
Encapsulation IC.Further, motor drive circuit can be formed as having include triangular wave oscillating circuit 31, comparator 32,
PWM signal generation section 33, sequencing contro portion 34, power on signal forming portion 35, comparator 37, position detection part
38 and the encapsulation IC of charging control section 39 and include the knot of encapsulation IC of inverter circuit 2 and drive circuit 36
Structure.That is, inverter circuit 2 can be encapsulated in IC in any combination with the structure included by control circuit 3.
Further, the substrate being equipped with motor drive circuit device had both been configured in the inside of motor 1, it is possible to be supported on horse
Reach the outer surface of 1, it is possible to independent from motor 1.
The present invention is applicable to motor drive circuit device and has the motor unit of this motor drive circuit.
Claims (8)
1. a motor drive circuit, it has:
Inverter circuit, its coil being had to motor provides electric power；And
Inverter control circuit,
Described inverter circuit has:
Upper arm side switch element, between its terminal being connected to be applied with motor voltage and described coil；And
Underarm side switch element, it is connected between described upper arm side switch element and ground wire,
Described inverter control circuit has position detection part, sequencing contro portion, boottrap capacitor and charging control section,
The position of rotation of the rotating part of described position detection part detection motor, exports rotating position signal,
Described sequencing contro portion, with reference to the speed instruction voltage inputted from outside and described rotating position signal, makes on described
Arm side switch element and described underarm side switch element switch to connect or disconnect,
The storage of described boottrap capacitor is used for driving the electric power of described upper arm side switch element,
It is characterized in that:
Described charging control section calculates the speed of the rotating part of motor with reference to described rotating position signal, when described
Sequence control portion output charging control signal,
When described speed instruction voltage reaches more than reference voltage and described speed is not up to benchmark speed,
Described sequencing contro portion makes described underarm side switching elements ON, filling of the described boottrap capacitor of the execution scheduled time
Electricity, after described boottrap capacitor has been carried out the charging of the scheduled time, make successively described upper arm side switch element and
Described underarm side switching elements ON or disconnection, make motor bring into operation,
When described speed reaches more than benchmark speed, described sequencing contro portion does not carry out described bootstrap capacitor
The charging of device, makes described upper arm side switch element and described underarm side switching elements ON or disconnection successively, makes motor
Bring into operation.
Motor drive circuit the most according to claim 1, it is characterised in that:
Described sequencing contro portion calculates speed with reference to the induced voltage of described motor.
Motor drive circuit the most according to claim 1, it is characterised in that:
Described inverter control circuit includes PWM signal generation section, power on signal forming portion and drive circuit,
Described PWM signal generation section generates pwm signal from described speed command signal,
Described sequencing contro portion adjusts the sequential of described pwm signal,
Pwm signal that described power on signal forming portion is exported with reference to described sequencing contro portion and generate power on signal,
Described drive circuit utilizes described power on signal to make described upper arm side switch element and described underarm side switch unit
Part switches to connect or disconnect.
Motor drive circuit the most according to claim 3, it is characterised in that:
Described drive circuit has:
Upper arm side ON-OFF control circuit, described upper arm side switch element is switched to connect or disconnect by it；
Underarm side ON-OFF control circuit, described underarm side switch element is switched to connect or disconnect by it；And
Described boottrap capacitor.
5. a motor unit, it has:
Motor；
Inverter circuit；And
Inverter control circuit,
Described motor has:
Stationary part, it has coil；And
Rotating part, it is supported for rotating by described stationary part,
Described inverter circuit has:
Upper arm side switch element, between its terminal being connected to be applied with motor voltage and described coil；And
Underarm side switch element, it is connected between described upper arm side switch element and ground wire,
Described inverter control circuit has position detection part, sequencing contro portion, boottrap capacitor and charging control section,
The position of rotation of the rotating part of described position detection part detection motor, exports rotating position signal,
Described sequencing contro portion makes described with reference to from speed instruction voltage and the described rotating position signal of outside input
Arm side switch element and described underarm side switch element switch to connect or disconnect,
The storage of described boottrap capacitor is used for driving the electric power of described upper arm side switch element,
It is characterized in that:
Described charging control section calculates the speed of the rotating part of motor with reference to described rotating position signal, when described
Sequence control portion output charging control signal,
When described speed instruction voltage reaches more than reference voltage and described speed is not up to benchmark speed,
Described sequencing contro portion makes described underarm side switching elements ON, filling of the described boottrap capacitor of the execution scheduled time
Electricity, after described boottrap capacitor has been carried out the charging of the scheduled time, make successively described upper arm side switch element and
Described underarm side switching elements ON or disconnection, make motor bring into operation,
When described speed reaches more than benchmark speed, described sequencing contro portion does not carry out described bootstrap capacitor
The charging of device, makes described upper arm side switch element and described underarm side switching elements ON or disconnection successively, makes motor
Bring into operation.
Motor unit the most according to claim 5, it is characterised in that:
Described motor unit also has the induced voltage test section of the induced voltage that detection produces in described stationary part.
Motor unit the most according to claim 5, it is characterised in that:
Described inverter control circuit has PWM signal generation section, power on signal forming portion and drive circuit,
Described PWM signal generation section generates pwm signal from described speed command signal,
Described sequencing contro portion adjusts the sequential of described pwm signal,
Described power on signal forming portion generates power on signal with reference to the pwm signal from the output of described sequencing contro portion,
Described drive circuit utilizes described power on signal to make described upper arm side switch element and described underarm side switch unit
Part switches to connect or disconnect.
Motor unit the most according to claim 7, it is characterised in that:
Described drive circuit has:
Upper arm side ON-OFF control circuit, it makes described upper arm side switch element switch to connect or disconnect；
Underarm side ON-OFF control circuit, it makes described underarm side switch element switch to connect or disconnect；And
Described boottrap capacitor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-033456 | 2012-02-18 | ||
| JP2012033456A JP5817021B2 (en) | 2012-02-18 | 2012-02-18 | Motor drive circuit and motor unit including the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103259468A CN103259468A (en) | 2013-08-21 |
| CN103259468B true CN103259468B (en) | 2016-09-21 |
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ID=48963214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310011504.9A Expired - Fee Related CN103259468B (en) | 2012-02-18 | 2013-01-11 | Motor drive circuit and there is the motor unit of this motor drive circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5817021B2 (en) |
| CN (1) | CN103259468B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6337211B2 (en) * | 2014-08-19 | 2018-06-06 | グアンドン ウェリング モーター マニュファクチュアリング カンパニー リミテッド | Start control method and system of air conditioner and outdoor fan thereof |
| CN105391349A (en) * | 2015-10-29 | 2016-03-09 | 四川长虹电器股份有限公司 | Variable frequency controller precharging control method |
| CN105305790B (en) * | 2015-11-25 | 2018-06-12 | 珠海格力电器股份有限公司 | Bootstrap circuit control method and control system |
| JP2018042349A (en) * | 2016-09-06 | 2018-03-15 | アイシン精機株式会社 | Motor control device |
| JP7197969B2 (en) * | 2017-05-25 | 2022-12-28 | 東芝ライフスタイル株式会社 | Inverter device |
| WO2019107156A1 (en) * | 2017-11-29 | 2019-06-06 | 日本電産株式会社 | Identification method for identifying type of brushless dc motor, identification device, and brushless dc motor |
| JP2019140804A (en) * | 2018-02-09 | 2019-08-22 | オムロン株式会社 | Motor controller |
| CN110190799B (en) * | 2018-02-23 | 2022-09-20 | 松下知识产权经营株式会社 | Motor control device and vehicle drive device |
| CN108667332A (en) * | 2018-05-18 | 2018-10-16 | 海信（山东）空调有限公司 | A kind of variable frequency inverter and its precharge control method and device |
| JP7392570B2 (en) | 2020-05-21 | 2023-12-06 | 富士電機株式会社 | inverter device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001211654A (en) * | 2000-01-20 | 2001-08-03 | Toshiba Corp | Inverter unit |
| JP2010200468A (en) * | 2009-02-25 | 2010-09-09 | Hitachi Ltd | Induced voltage detector circuit, motor drive semiconductor device having the same, motor and air conditioner |
| CN102158153A (en) * | 2009-12-01 | 2011-08-17 | 日本电产芝浦株式会社 | Motor having circuit for decreasing standby current |
-
2012
- 2012-02-18 JP JP2012033456A patent/JP5817021B2/en not_active Expired - Fee Related
-
2013
- 2013-01-11 CN CN201310011504.9A patent/CN103259468B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001211654A (en) * | 2000-01-20 | 2001-08-03 | Toshiba Corp | Inverter unit |
| JP2010200468A (en) * | 2009-02-25 | 2010-09-09 | Hitachi Ltd | Induced voltage detector circuit, motor drive semiconductor device having the same, motor and air conditioner |
| CN102158153A (en) * | 2009-12-01 | 2011-08-17 | 日本电产芝浦株式会社 | Motor having circuit for decreasing standby current |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013172492A (en) | 2013-09-02 |
| JP5817021B2 (en) | 2015-11-18 |
| CN103259468A (en) | 2013-08-21 |
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