CN103259468A - Motor driving circuit and motor unit equipped with the same - Google Patents
Motor driving circuit and motor unit equipped with the same Download PDFInfo
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- CN103259468A CN103259468A CN2013100115049A CN201310011504A CN103259468A CN 103259468 A CN103259468 A CN 103259468A CN 2013100115049 A CN2013100115049 A CN 2013100115049A CN 201310011504 A CN201310011504 A CN 201310011504A CN 103259468 A CN103259468 A CN 103259468A
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Abstract
The invention discloses a motor driving circuit and a motor unit equipped with the same. The motor driving circuit has an inversion circuit and a control circuit. The inversion circuit provides power for a coil in the motor. The inversion circuit has an upper arm switch element and a lower arm switch element. The upper arm switch element is connected between a terminal with application of motor voltage and the coil. The lower arm switch elemen is connected between the upper arm switch elemen and a ground wire. The control circuit has a switch control portion and a bootstrap capacitor. The switch control enables the switch elements of the inverion circuit to be switched to be on or off based on externally input speed instruction voltage and detection signals. The bootstrap capacitor can store power used for driving the upper arm switch element. When the speed instruction voltage reaches above preset voltage, the switch control portion charges the bootstrap capacitor within preset time.
Description
Technical field
The motor unit that the present invention relates to a kind of motor drive circuit and have this motor drive circuit.
Background technology
Brushless DC motor can move by being provided driving voltage from inverter circuit.Day disclosure communique 2003-158887 communique discloses a kind of inverter circuit that driving voltage is provided to brushless DC motor.Inverter circuit has a plurality of for the switch element that voltage is provided to each coil of brushless DC motor.The type of drive of switch element has the bootstrapping guidance mode.The bootstrapping guidance mode is connected with capacitor at a plurality of switch elements respectively, thereby by the electric charge that is stored in capacitor switch element is connected.
Summary of the invention
In general bootstrapping guidance mode, less as the structure of tackling the countermeasure of disturbing.For example, in the motor of the off-premises station that is installed in air-conditioning, not under the state of inverter circuit input speed command signal, when the impeller that is connected with the output shaft of motor rotates owing to wind etc., the motor action of generating electricity.The regenerative voltage that the motor generating produces offers inverter circuit, thereby the voltage of possible inverter circuit rises.
The disclosed motor drive circuit of the application has inverter circuit and control circuit.Inverter circuit provides electric power to the coil that is installed in the motor.Inverter circuit has upper arm side switch element and underarm side switch element.Upper arm side switch element is connected between the terminal and coil that is applied with motor voltage.Underarm side switch element is connected between upper arm side switch element and the ground wire.Control circuit has switch control part and bootstrap capacitor.The speed instruction voltage that the reference of switch control part is imported from the outside and detection signal switch to the included switch element of inverter circuit and connect or disconnect.Bootstrap capacitor can be stored for the electric power that drives upper arm side switch element.When speed instruction voltage reaches predetermined voltage when above, the switch control part carries out the charging of the bootstrap capacitor of the scheduled time.
The disclosed motor drive circuit of the application, its switch control part is calculated the speed of motor, and compares speed and predetermined speed.When speed does not reach predetermined speed, carry out the charging of bootstrap capacitor.
The disclosed motor drive circuit of the application, its switch control part is calculated speed with reference to the induced voltage of motor, and compares speed and predetermined speed.When speed does not reach predetermined speed, carry out the charging of bootstrap capacitor.
The disclosed motor drive circuit of the application, its switch control part has pwm signal generating unit, sequencing control portion, power on signal forming portion and drive circuit.The pwm signal generating unit generates pwm signal from speed command signal.Sequencing control portion adjusts the sequential of pwm signal.The power on signal forming portion generates power on signal with reference to the pwm signal from the output of sequencing control portion.Drive circuit utilizes power on signal that upper arm side switch element and underarm side switch element are switched to and connects or disconnects.
The disclosed motor drive circuit of the application, its drive circuit have upper arm side ON-OFF control circuit, underarm side ON-OFF control circuit and bootstrap capacitor.Upper arm side ON-OFF control circuit switches to upper arm side switch element and connects or disconnects.Underarm side ON-OFF control circuit switches to underarm side switch element and connects or disconnects.
The disclosed motor unit of the application has motor, inverter circuit and control circuit.Motor comprises stationary part with coil and is supported for the rotating part that can rotate by stationary part.Inverter circuit has upper arm side switch element and underarm side switch element.Upper arm side switch element is connected between the terminal and coil that is applied with motor voltage.Underarm side switch element is connected between upper arm side switch element and the ground wire.Control circuit has switch control part and bootstrap capacitor.The speed instruction voltage that the reference of switch control part is imported from the outside and detection signal switch to the included switch element of inverter circuit and connect or disconnect.Bootstrap capacitor can be stored for the electric power that drives upper arm side switch element.When speed instruction voltage reaches predetermined voltage when above, the switch control part carries out the charging of the bootstrap capacitor of the scheduled time.
The disclosed motor unit of the application, its motor has position detection part.Position detection part detects position of rotation and the output detection signal of rotating part.The switch control part utilizes detection signal to calculate speed, and compares speed and predetermined speed.When speed does not reach predetermined speed, carry out the charging of bootstrap capacitor.
The disclosed motor unit of the application also has the induced voltage test section.The induced voltage test section detects the induced voltage that produces in stationary part.The utilization of switch control part is calculated speed by the detected induced voltage of induced voltage test section, and compares speed and predetermined speed.When speed does not reach predetermined speed, carry out the charging of bootstrap capacitor.
The disclosed motor unit of the application, its switch control part has pwm signal generating unit, sequencing control portion, power on signal forming portion and drive circuit.The pwm signal generating unit generates pwm signal from speed command signal.Sequencing control portion adjusts the sequential of pwm signal.The power on signal forming portion generates power on signal with reference to the pwm signal from the output of sequencing control portion.Drive circuit utilizes power on signal that upper arm side switch element and underarm side switch element are switched to and connects or disconnects.
The disclosed motor unit of the application, its drive circuit comprise upper arm side ON-OFF control circuit, underarm side ON-OFF control circuit and bootstrap capacitor.Upper arm side ON-OFF control circuit switches to upper arm side switch element and connects or disconnects.Underarm side ON-OFF control circuit switches to underarm side switch element and connects or disconnects.
According to the illustrative execution mode of the application, even motor has carried out the generating action owing to disturbing, also can prevent from inverter circuit is applied high voltage.
Description of drawings
Fig. 1 is the block diagram of the related motor unit of present embodiment.
Fig. 2 is the circuit diagram of the related inverter circuit of present embodiment and drive circuit.
Fig. 3 is the flow chart of the related motor unit of present embodiment.
Fig. 4 is the sequential chart of the related motor unit of present embodiment.
Fig. 5 is the variation of the related motor unit of present embodiment.
Embodiment
＜execution mode 1 〉
1. the structure of motor drive circuit
Fig. 1 is the block diagram of the related motor unit of an execution mode of this enforcement.Motor unit has motor 1, inverter circuit 2 and control circuit 3.Control circuit 3 makes inverter circuit 2 actions.Inverter circuit 2 provides driving voltage to motor 1.Motor unit has shunt resistance R1.
Triangular wave oscillating circuit 31 output triangular wave (sawtooth waveforms) signals.
The triangular signal that comparator 32 relatively sends from triangular wave oscillating circuit 31 and from the speed instruction voltage Vsp of outside input.
Pwm signal generating unit 33 generates pwm signal from the comparative result by comparator 32 outputs.Specifically, pwm signal generating unit 33 is with reference to the comparative result production burst signal from comparator 32 outputs, this pulse signal with speed instruction voltage Vsp than triangular wave big during serve as connect during, with speed instruction voltage Vsp than triangular wave little during be off period.
Power on signal forming portion 35 generates the power on signal that is used for driving switch element 6 based on the pwm signal of being adjusted by sequencing control portion 34.Power on signal forming portion 35 outputs to drive circuit 36 with the power on signal that generates.
The charging action that charging control section 39 controls are carried out drive circuit 36 included bootstrap capacitor C1～C3.Specifically, charging control section 36 reference position test sections 38 detected positional informations generate the charging control signal that bootstrap capacitor C1～C3 is charged with scheduled timing.
Transducer 4 is included in the motor 1, and be configured in rotating part near.Transducer 4 preferably includes a plurality of sensor elements, comprises three sensor elements in the present embodiment.The included sensor element of transducer 4 is according to the arranged spaced of the electric angles of 120 degree centered by the rotating shaft of rotating part.Transducer 4 can detect the position of rotation of rotating part.Transducer 4 for example can be by detecting the included magnet of rotating part the Magnetic Sensor of magnetic flux realize.For example, use Hall element as Magnetic Sensor.In addition, the number of transducer 4 is three in the present embodiment, but is not limited to this.The position of transducer 4 is the arranged spaced according to the electric angles of 120 degree in the present embodiment, but is not limited to this.
Fig. 2 is the circuit diagram of inverter circuit 2 and drive circuit 36.As shown in Figure 2, inverter circuit 2 has six switch element Q1～Q6.In addition, in this manual, switch element Q1, Q3, Q5 are called " upper arm ", switch element Q2, Q4, Q6 are called " underarm ".Drive circuit 36 has the first upper arm drive circuit 36a, the first underarm drive circuit 36b, the second upper arm drive circuit 36c, the second underarm drive circuit 36d, the 3rd upper arm drive circuit 36e, the 3rd underarm drive circuit 36f, diode D1～D3, current-limiting resistance R11～R13 and bootstrap capacitor C1～C3.Drain electrode at switch element Q1, Q3, Q5 is applied with motor voltage Vm.In switch element Q1, grid is connected with the first upper arm drive circuit 36a, and source electrode is connected with the U phase coil of motor 1 and the drain electrode of switch element Q2.In switch element Q2, grid is connected source ground with the first underarm drive circuit 36b.In switch element Q3, grid is connected with the second upper arm drive circuit 36c, and source electrode is connected with the V phase coil of motor 1 and the drain electrode of switch element Q4.In switch element Q4, grid is connected source ground with the second underarm drive circuit 36d.In switch element Q5, grid is connected with the 3rd upper arm drive circuit 36e, and source electrode is connected with the W phase coil of motor 1 and the drain electrode of switch element Q6.In switch element Q6, grid is connected source ground with the 3rd underarm drive circuit 36f.
Terminal UH is connected with the first upper arm drive circuit 36a.Terminal UL is connected with the first underarm drive circuit 36b.Terminal VH is connected with the second upper arm drive circuit 36c.Terminal VL is connected with the second underarm drive circuit 36d.Terminal WH is connected with the 3rd upper arm drive circuit 36e.Terminal WL is connected with the 3rd underarm drive circuit 36f.To the power on signal of terminal UH～WL input from 35 outputs of power on signal forming portion.
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 prevented the generation of flow restriction operation by the initial stage charging current of bootstrap capacitor C1～C3.
Bootstrap capacitor C1 is connected between the source electrode of diode D1 and switch element Q1.Bootstrap capacitor C2 is connected between the source electrode of diode D2 and switch element Q3.Bootstrap capacitor C3 is connected between the source electrode of diode D3 and switch element Q5.Diode D1～D3 is connected with the voltage input terminal with control.Therefore, when switch element Q1 disconnection, when switch element Q2 connects, bootstrap capacitor C1 charging.And, when switch element Q3 disconnection, when switch element Q4 connects, bootstrap capacitor C2 charging.And, when switch element Q5 disconnection, when switch element Q6 connects, bootstrap capacitor C3 charging.
2. the action of motor unit
2-1. the run action of motor unit
Fig. 3 is the flow chart that the action of motor unit is shown.Below, describe with reference to the action of the motor unit of Fig. 3.In addition, flow process shown in Figure 3 is that motor 1 stops Vsp input terminal 40 is not applied with speed instruction voltage Vsp, and the charging of bootstrap capacitor action stops to prerequisite.And as an example, the motor unit of present embodiment is the motor that makes the fan rotation of the off-premises station that is equipped on air-conditioning.Therefore, the axle at motor 1 is connected with impeller as load.In addition, off-premises station is based on from the order of the indoor set of air-conditioning and move.
The indoor set of air-conditioning from remote controller etc. receive comprise make power supply switch to the signal of order of connection from disconnection after, send action command to peripheral control unit.After peripheral control unit receives action command, speed instruction voltage Vsp is imposed on the Vsp input terminal 40(S1 of motor unit).
Next, sequencing control portion 34 compares speed instruction voltage Vsp and reference voltage V th.Sequencing control portion 34 continues to carry out comparison (S2).
When sequencing control portion 34 judges that with reference to charging control signal speed f does not reach reference frequency fth (in S3, being judged as "Yes"), the charging of the included bootstrap capacitor C1～C3 of drive circuit 36 is begun.In addition, reference frequency fth is as long as the value that stops for the spinning movement of rotating part that can detect motor 1 is 1 hertz as an example in the present embodiment.And the speed that does not reach reference frequency fth comprises the speed (0 hertz) the when rotating part of motor 1 stops.And sequencing control portion 34 has timer, from the sequential of the charging of beginning bootstrap capacitor C1～C3 pick up counting (S4).
Specifically, sequencing control portion 34 will make the upper arm disconnection in the inverter circuit 2 and the order that underarm is connected send to power on signal forming portion 35.Power on signal forming portion 35 is based on generating UH signal, VH signal and the WH signal that the upper arm that makes inverter circuit 2 disconnects from the order of sequencing control portion 34, and generates UL signal, VL signal and WL signal that the underarm that makes inverter circuit 2 is connected.Power on signal forming portion 35 sends to drive circuit 36 with the signal that generates.
The first upper arm drive circuit 36a descends the grid voltage of switch element Q1, thereby switch element Q1 is disconnected.The second upper arm drive circuit 36c descends the grid voltage of switch element Q3, thereby switch element Q3 is disconnected.The 3rd upper arm drive circuit 36e descends the grid voltage of switch element Q5, thereby switch element Q5 is disconnected.The first underarm drive circuit 36b rises the grid voltage of switch element Q2, thereby switch element Q2 is connected.The second underarm drive circuit 36d rises the grid voltage of switch element Q4, thereby switch element Q4 is connected.The 3rd underarm drive circuit 36f rises the grid voltage of switch element Q6, thereby switch element Q6 is connected.
Move as described above by switch element Q1 and Q2 because the drain electrode of switch element Q2 becomes electronegative potential, therefore based on control with the electric current of voltage vcc flow through diode D1, bootstrap capacitor C1 and switch element Q2, thereby bootstrap capacitor C1 is recharged.And, move as described above by switch element Q3 and Q4, because the drain electrode of switch element Q4 becomes electronegative potential, therefore based on control with the electric current of voltage vcc flow through diode D2, bootstrap capacitor C2 and switch element Q4, thereby bootstrap capacitor C2 is recharged.And, move as described above by switch element Q5 and Q6, because the drain electrode of switch element Q6 becomes electronegative potential, therefore based on control with the electric current of voltage vcc flow through diode D3, bootstrap capacitor C3 and switch element Q6, thereby bootstrap capacitor C3 is recharged.
If sequencing control portion 34 judges the charging interval of bootstrap capacitor C1～C3 and has passed through the predetermined charging interval (being judged as "Yes" in S5), the charging of bootstrap capacitor C1～C3 is stopped.Specifically, sequencing control portion 34 removes the upper arm disconnection that makes in the inverter circuit 2 and the state (S6) that underarm is connected.
Below, the concrete run action of motor unit is described.
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, WH signal and the WL signal of the VH signal of the UH signal of power on signal forming portion 35 generation U phases and UL signal, V phase and VL signal, W phase.Power on signal forming portion 35 sends to drive circuit 36 with the signal that generates.In addition, UH signal, VH signal and WH signal are the signal for the upper arm action that makes inverter circuit 2.UL signal, VL signal and WL signal are the signal for the underarm action that makes inverter circuit 2.UH signal, VH signal and WH signal have for example phase difference of 120 degree mutually.UL signal, VL signal and WL signal have for example phase difference of 120 degree mutually.
The UH signal is input to the first upper arm drive circuit 36a of drive circuit 36.The first upper arm drive circuit 36a makes gate turn-on or the disconnection of switch element Q1 based on the UH signal.The UL signal is input to the first underarm drive circuit 36b of drive circuit 36.The first underarm drive circuit 36b makes gate turn-on or the disconnection of switch element Q2 based on the UL signal.The VH signal is input to the second upper arm drive circuit 36c of drive circuit 36.The second upper arm drive circuit 36c makes gate turn-on or the disconnection of switch element Q3 based on the VH signal.The VL signal is input to the second underarm drive circuit 36d of drive circuit 36.The second underarm drive circuit 36d makes gate turn-on or the disconnection of switch element Q4 based on the VL signal.The WH signal is input to the 3rd upper arm drive circuit 36e of drive circuit 36.The 3rd upper arm drive circuit 36e makes gate turn-on or the disconnection of switch element Q5 based on the WH signal.The WL signal is input to the 3rd underarm drive circuit 36f of drive circuit 36.The 3rd underarm drive circuit 36f makes gate turn-on or the disconnection of switch element Q6 based on the WL signal.
The sequential discharge that bootstrap capacitor C1 connects at switch element Q1.The sequential discharge that bootstrap capacitor C2 connects at switch element Q3.The sequential discharge that bootstrap capacitor C3 connects at switch element Q5.
And the sequential charging that bootstrap capacitor C1 connects at switch element Q2.The sequential charging that bootstrap capacitor C2 connects at switch element Q4.The sequential charging that bootstrap capacitor C3 connects at switch element Q5.In addition, because the sequential of switch element Q2, Q4, Q6 connection has the phase differences of 120 degree, so bootstrap capacitor C1～C3 spends the cycle charging with 120.
Move as described above by inverter circuit 2, the rotating part of motor 1 is rotated with the rotary speed corresponding to speed instruction voltage Vsp.
Fig. 4 is the sequential chart that the charging action of the run action of the related motor of present embodiment 1 and bootstrap capacitor C1～C3 is shown.Fig. 4 (a) is the rotating position signal from position detection part 38 output, during the high position expression transducer 4 detect magnet magnetic flux during.Fig. 4 (b) is the charging control signal of charging control section 39 output, during the high position for during the charging of carrying out bootstrap capacitor C1～C3.Fig. 4 (c) illustrates speed instruction voltage Vsp.
In Fig. 4, the indoor set of air-conditioning sends to peripheral control unit with action command after comprising the signal of the order that makes power supply switch to connection from disconnection from receptions such as remote controllers.After peripheral control unit receives action command, speed instruction voltage Vsp is imposed on the Vsp input terminal 40(sequential t1 of motor unit).
2-2. the action of motor unit when load rotates because of external factor
The off-premises station of air-conditioning arranges without mostly.In such off-premises station, when the motor off-duty, if wind etc. blow to impeller (load), then impeller can rotate.Under motor 1 off-duty state, if impeller is owing to external factor (wind etc.) is rotated, the rotating part of the motor 1 that then is connected with impeller also rotates.The rotating part rotation, then the stationary part at motor 1 produces regenerative voltage.
In the present embodiment, one of its feature is, as shown in Figure 3, comprises the step (S3) of the speed f of the step (S2) of monitoring velocity command voltage Vsp and monitoring motor 1.That is, in the present embodiment, when speed instruction voltage Vsp reaches more than the reference voltage V th, when the speed f of motor 1 was higher than reference frequency fth, bootstrap capacitor C1～C3 did not charge.That is to say that under the state that impeller rotates owing to external factor, when applying speed instruction voltage Vsp, bootstrap capacitor C1～C3 does not charge.By such structure, when under the state that impeller rotates owing to external factor (wind etc.), making motor 1 operation, because bootstrap capacitor C1～C3 does not charge, therefore can prevent that the voltage of inverter circuit 2 from significantly rising.
For example, in the flow process of the step that does not have monitoring velocity command voltage Vsp, owing to when outer thereby rotation, motor unit is applied with speed instruction voltage Vsp, if speed instruction voltage Vsp surpasses reference voltage V th, then bootstrap capacitor charges when impeller.During the bootstrap capacitor charging, underarm (switch element Q2, Q4, Q6 shown in Figure 2) is connected.After underarm was connected, the voltages at nodes of the node of the node of switch element Q1 and Q2, switch element Q3 and Q4, switch element Q5 and Q6 rose, thereby the rotating part in the rotation is applied braking.At this moment, when because the rotary speed of the rotating part of outer thereby rotation when fast, in the high regenerative voltage of stationary part value of being applied with of motor 1, thus the motor voltage Vm of inverter circuit 2 rising.If motor voltage Vm surpasses the withstand voltage of inverter circuit 2, then switch element might be damaged.
2-3. the action of motor unit after motor stops because of external factor
When motor unit moved, when the power supply of cutting off motor unit, then speed instruction voltage Vsp, control descended rapidly with voltage vcc and motor voltage Vm.
In the present embodiment, one of its feature is, as shown in Figure 3, comprises the step (S3) of the speed f of the step (S2) of monitoring velocity command voltage Vsp and monitoring motor 1.That is, in the present embodiment, when speed instruction voltage Vsp reaches more than the reference voltage V th, when the speed f of motor 1 was higher than reference frequency fth, bootstrap capacitor C1～C3 did not charge.By such structure, when being applied with speed control signal Vsp, if the power supply of motor unit is cut off and the rotating part of motor 1 when rotating owing to inertia etc., bootstrap capacitor C1～C3 does not charge.Therefore, the voltage that can prevent inverter circuit 2 significantly rises.
For example, in the flow process of the step of the speed f of the step that does not have monitoring velocity command voltage Vsp and monitoring motor 1, when motor 1 operation, power supply is cut off, speed instruction voltage Vsp drops to the charging keying level, thereby carries out the charging of bootstrap capacitor.When bootstrap capacitor charged, underarm (switch element Q2, Q4, Q6 shown in Figure 2) was connected.Underarm is connected, and then the voltages at nodes of the node of the node of switch element Q1 and Q2, switch element Q3 and Q4, switch element Q5 and Q6 raises, thereby the rotating part of motor 1 is applied with braking.At this moment, when the rotary speed of rotating part is being about to apply braking under the high situation, the regenerative voltage that produces in the stationary part of motor 1 raises.If regenerative voltage raises, then the motor voltage Vm of inverter circuit 2 raises.If motor voltage Vm surpasses the withstand voltage of inverter circuit 2, then switch element might be damaged.
3. the effect of execution mode and other
The related motor unit of present embodiment comprises the step (S3) of speed f of the rotating part of the step (S2) of monitoring velocity command voltage Vsp and monitoring motor 1 in driving flow process.Motor unit reaches more than the reference voltage V th at speed instruction voltage Vsp, when speed f does not reach reference frequency fth, and bootstrap capacitor C1～C3 charging.By such structure, when the loads such as impeller that are connected with motor 1 rotate owing to external factor such as wind, even be applied with speed instruction voltage Vsp, do not charge owing to bootstrap capacitor C1～C3 yet, and can prevent from producing high regenerative voltage at motor 1.Therefore, can prevent that the voltage in the inverter circuit 2 from rising, thereby prevent the switch element breakage that inverter circuit 2 is included.
And, even being in operation, motor 1 is de-energized, speed instruction voltage Vsp thereby decline rapidly also can prevent from producing high regenerative voltage at motor 1 owing to bootstrap capacitor C1～C3 is recharged.Therefore, can prevent that the voltage in the inverter circuit 2 from rising, thereby can prevent the switch element breakage that inverter circuit 2 is included.
And in the present embodiment, sequencing control portion 34 has the timer in the charging interval of monitoring bootstrap capacitor C1～C3.Thus, sequencing control portion 34 will be owing to will can reduce power consumption in the given time to the charging action restriction of bootstrap capacitor C1～C3.
In addition, in the present embodiment, the charging interval of bootstrap capacitor C1～C3 is 1.5 milliseconds, and this value is in order to ensure the required shortest time of necessary charge volume when the capacity of bootstrap capacitor C1～C3 is 1 microfarad (example).Necessary charge volume is not limited to be full of electricity, also can shorten the charging interval wittingly (for example 0.5 millisecond etc.).
And, in the present embodiment, used transducer 4 for the speed of the rotating part that detects motor 1, thereby but also can be the structure that induced voltage that detection produces at motor 1 detects the speed of rotating part.Fig. 5 illustrates the variation of the related motor unit of present embodiment.Motor unit shown in Figure 5 also has testing circuit 41 in motor unit shown in Figure 1.Testing circuit 41 can detect the induced voltage that produces at motor 1.Testing circuit 41 sends to position detection part 38 with the value of detected induced voltage.Position detection part 38 detects the frequency of induced voltage from the value of the induced voltage that sent by testing circuit 41.Position detection part 38 sends to sequencing control portion 34 with the frequency of induced voltage.Sequencing control portion 34 is frequency and the reference voltage frequency of induced voltage relatively.When the frequency ratio reference voltage frequency of induced voltage was hanged down, sequencing control portion 34 judged that the rotating part of motors 1 stops.Sequencing control portion 34 is with the judgment standard of judged result as the determining step S3 among Fig. 3.
And control circuit 3 also can be when the charge volume of bootstrap capacitor C1～C3 does not reach predetermined value, to the structure of the coil power supply that is connected with each bootstrap capacitor C1～C3.Such structure can realize by having the under-voltage protection circuit.
And motor drive circuit can form and comprise the encapsulation IC with control circuit 3 and have the structure of the encapsulation IC of inverter circuit 2.And motor drive circuit can have the encapsulation IC that comprises inverter circuit 2 and control circuit 3.And motor drive circuit can form to have the encapsulation IC that comprises triangular wave oscillating circuit 31, comparator 32, pwm signal generating unit 33, sequencing control portion 34, power on signal forming portion 35, comparator 37, position detection part 38 and charging control section 39 and comprises inverter circuit 2 and the structure of the encapsulation IC of drive circuit 36.That is, the included structure of inverter circuit 2 and control circuit 3 can be gone among the IC with assembled package arbitrarily.
And the substrate that is equipped with the motor drive circuit device is both configurable in the inside of motor 1, also can be supported on the outer surface of motor 1, also can be independent from motor 1.
The present invention is applicable to motor drive circuit device and the motor unit with this motor drive circuit.
Claims (10)
1. motor drive circuit, it has:
Inverter circuit, it provides electric power to the coil that motor has; And
Control circuit,
Described inverter circuit has:
Upper arm side switch element, it is connected between the terminal and described coil that is applied with motor voltage; And
Underarm side switch element, it is connected between described upper arm side switch element and the ground wire,
Described control circuit has:
The switch control part, it switches to the included switch element of described inverter circuit and connects or disconnects with reference to speed instruction voltage and detection signal from the outside input; And
Bootstrap capacitor, it can be stored for the electric power that drives described upper arm side switch element,
It is characterized in that:
When described speed instruction voltage reaches predetermined voltage when above, described switch control part is carried out the charging of the described bootstrap capacitor of the scheduled time.
2. motor drive circuit according to claim 1 is characterized in that:
Described switch control part is calculated the speed of described motor, and more described speed and predetermined speed, and carries out the charging of described bootstrap capacitor when described speed does not reach described predetermined speed.
3. motor drive circuit according to claim 1 is characterized in that:
Described switch control part is calculated speed with reference to the induced voltage of described motor, and more described speed and predetermined speed, and carries out the charging of described bootstrap capacitor when described speed does not reach described predetermined speed.
4. motor drive circuit according to claim 1 is characterized in that:
Described switch control part comprises:
The pwm signal generating unit, it generates pwm signal from described speed command signal;
Sequencing control portion, it adjusts the sequential of described pwm signal;
The power on signal forming portion, the pwm signal that it is exported with reference to described sequencing control portion and generate power on signal; And
Drive circuit, it utilizes described power on signal that described upper arm side switch element and described underarm side switch element are switched to and connects or disconnects.
5. motor drive circuit according to claim 4 is characterized in that:
Described drive circuit has:
Upper arm side ON-OFF control circuit, it switches to described upper arm side switch element and connects or disconnects;
Underarm side ON-OFF control circuit, it switches to described underarm side switch element and connects or disconnects; And
Described bootstrap capacitor.
6. motor unit, it has:
Motor;
Inverter circuit; And
Control circuit,
Described motor has:
Stationary part, it has coil; And
Rotating part, it is supported for and can rotates by described stationary part,
Described inverter circuit has:
Upper arm side switch element, it is connected between the terminal and described coil that is applied with motor voltage; And
Underarm side switch element, it is connected between described upper arm side switch element and the ground wire,
Described control circuit has:
The switch control part, the speed instruction voltage that its reference is imported from the outside and detection signal switch to the included switch element of described inverter circuit and connect or disconnect; And
Bootstrap capacitor, it can be stored for the electric power that drives described upper arm side switch element,
It is characterized in that:
When described speed instruction voltage reaches predetermined voltage when above, described switch control part is carried out the charging of the described bootstrap capacitor of the scheduled time.
7. motor unit according to claim 6 is characterized in that:
Described motor has position detection part, and described position detection part detects position of rotation and the output detection signal of described rotating part,
Described switch control part utilizes described detection signal to calculate speed, and more described speed and predetermined speed, when described speed does not reach described predetermined speed, carries out the charging of described bootstrap capacitor.
8. motor unit according to claim 6 is characterized in that:
Described motor unit also has detection at the induced voltage test section of the induced voltage of described stationary part generation,
The induced voltage that described switch control part utilizes described induced voltage test section to detect is calculated speed, and more described speed and predetermined speed, when described speed does not reach described predetermined speed, carry out the charging of described bootstrap capacitor.
9. motor unit according to claim 6 is characterized in that:
Described switch control part has:
The pwm signal generating unit, it generates pwm signal from described speed command signal;
Sequencing control portion, it adjusts the sequential of described pwm signal;
The power on signal forming portion, it generates power on signal with reference to the pwm signal from the output of described sequencing control portion; And
Drive circuit, it utilizes described power on signal that described upper arm side switch element and described underarm side switch element are switched to and connects or disconnects.
10. motor unit according to claim 9 is characterized in that:
Described drive circuit has:
Upper arm side ON-OFF control circuit, it switches to described upper arm side switch element and connects or disconnects;
Underarm side ON-OFF control circuit, it switches to described underarm side switch element and connects or disconnects; And
Described bootstrap 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 true CN103259468A (en) | 2013-08-21 |
| CN103259468B CN103259468B (en) | 2016-09-21 |
Family
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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) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305790A (en) * | 2015-11-25 | 2016-02-03 | 珠海格力电器股份有限公司 | Control method and control system of bootstrap circuit |
| 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 |
| 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 |
| CN110190799A (en) * | 2018-02-23 | 2019-08-30 | 松下知识产权经营株式会社 | Control device of electric motor and vehicle drive unit |
| CN111066238A (en) * | 2018-02-09 | 2020-04-24 | 欧姆龙株式会社 | Motor control device |
| CN111406363A (en) * | 2017-11-29 | 2020-07-10 | 日本电产株式会社 | Identification method and identification device for identifying type of brushless DC motor, and brushless DC motor |
| CN113727812A (en) * | 2019-04-26 | 2021-11-30 | 工机控股株式会社 | Electrical machine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101869665B1 (en) * | 2014-08-19 | 2018-07-20 | 광동 웰링 모터 매뉴팩처링 컴퍼니, 리미티드 | Air conditioner and startup control method and system for outdoor fan of the air conditioner |
| 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 |
| JP7392570B2 (en) | 2020-05-21 | 2023-12-06 | 富士電機株式会社 | inverter device |
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| 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
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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 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105305790A (en) * | 2015-11-25 | 2016-02-03 | 珠海格力电器股份有限公司 | Control method and control system of bootstrap circuit |
| CN105305790B (en) * | 2015-11-25 | 2018-06-12 | 珠海格力电器股份有限公司 | Boostrap circuit control method and control system |
| CN111406363A (en) * | 2017-11-29 | 2020-07-10 | 日本电产株式会社 | Identification method and identification device for identifying type of brushless DC motor, and brushless DC motor |
| CN111066238A (en) * | 2018-02-09 | 2020-04-24 | 欧姆龙株式会社 | Motor control device |
| CN110190799A (en) * | 2018-02-23 | 2019-08-30 | 松下知识产权经营株式会社 | Control device of electric motor and vehicle drive unit |
| 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 |
| CN113727812A (en) * | 2019-04-26 | 2021-11-30 | 工机控股株式会社 | Electrical machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5817021B2 (en) | 2015-11-18 |
| JP2013172492A (en) | 2013-09-02 |
| CN103259468B (en) | 2016-09-21 |
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