CN1681194A - Motor controlling circuit with controllable driven voltage supply - Google Patents
Motor controlling circuit with controllable driven voltage supply Download PDFInfo
- Publication number
- CN1681194A CN1681194A CNA2004100334846A CN200410033484A CN1681194A CN 1681194 A CN1681194 A CN 1681194A CN A2004100334846 A CNA2004100334846 A CN A2004100334846A CN 200410033484 A CN200410033484 A CN 200410033484A CN 1681194 A CN1681194 A CN 1681194A
- Authority
- CN
- China
- Prior art keywords
- signal
- coupled
- circuit
- voltage
- linear unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000010977 unit operation Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006066 Comins reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000006681 Combes synthesis reaction Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
The H-bridge circuit consists of first and second switch unit, and first and second linear unit, and is used to impress driving current on motor. The error amplifier generates error signal that presents the difference between command current signal and driving current detected by current detection circuit. The status control circuit simultaneously controls first and second switch unit and feed back circuit. The error signal is selectively impressed on first and second linear unit to make one of them operate at linear mode and other one operate at off state in order to control driving current being in direct proportion to command current signal. The status circuit also controls braking circuit to make error signal convert to braking signal, and first and second linear unit operate at on state mode.
Description
[technical field]
The present invention is about a kind of motor control circuit, especially about a kind of control circuit of may command driving voltage to motor that provide.
[background technology]
Generally speaking, can be applicable to provide driving voltage to motor by four H bridge circuits that switching transistor was construed as, for example d.c. motor, stepper motor and voice coil motor or the like, thereby rotation direction, rotating speed and other operating characteristicses of control motor.
Fig. 1 shows the circuit diagram of the H bridge circuit 10 that is used for CD-ROM drive motor M of prior art.With reference to Fig. 1, motor M is coupled in supply-voltage source V via H bridge circuit 10
mAnd between ground potential.Though in fact by the complication system that element constituted of numerous mechanicalnesses and circuit, driving voltage is applied to the coil among the motor M to motor M basically, thereby produce magnetic field.Therefore, " motor " speech mainly is meant the coil of motor hereinafter, can be considered as an inductive load simplifiedly, and also this point of lay special stress on and describe motor M with coil of accompanying drawing.
Because nmos pass transistor Q
1To Q
4Has parasitic diode D respectively
1To D
4So H bridge circuit 10 need not additionally be provided with flywheel (Flywheel) diode.If four switching transistors of H bridge circuit 10 are implemented by bipolar junction transistor (BJT), then diode D as shown in Figure 1
1To D
4Must additionally be provided with.
Nmos pass transistor Q
1To Q
4Gate pole respectively by control signal G
1To G
4Control.As control signal G
1With G
4Be in logic high and control signal G
2With G
3When being in logic low, nmos pass transistor Q
1With Q
4Conducting and nmos pass transistor Q
2With Q
3Not conducting makes the nmos pass transistor Q of terminal A via conducting
1Be coupled in supply-voltage source V
m, and terminal B is via the nmos pass transistor Q of conducting
4Be coupled in ground potential.As a result, supply-voltage source V
mApply a driving voltage to motor M, make drive current I
1With the motor M that flows through of the direction from terminal A to terminal B.As control signal G
1With G
4Be in logic low and control signal G
2With G
3When being in logic high, nmos pass transistor Q
1With Q
4Not conducting and nmos pass transistor Q
2With Q
3Conducting makes the nmos pass transistor Q of terminal B via conducting
2Be coupled in supply-voltage source V
m, and terminal A is via the nmos pass transistor Q of conducting
3Be coupled in ground potential.As a result, supply-voltage source V
mApply another driving voltage to motor M, make drive current I
2With the motor M that flows through of the direction from terminal B to terminal A.
In the extensive use of using motor M, put on the practical operation feature of the driving voltage decision motor M between terminal A and B, thereby need to satisfy some application requirements on the typical case.At first, the polarity of driving voltage and order of magnitude are necessary for controllable physical quantity, because the polarity of driving voltage decision is by the order of magnitude decision of the direction in the magnetic field that coil produced of motor M and the driving voltage intensity by the magnetic field that coil produced of motor M.Especially need operate in the following time of situation of level pressure driving as motor M, the order of magnitude of driving voltage must be kept fixing.
On the prior art, pulse-width modulation (PWM) technology is through being usually used in controlling the order of magnitude of the driving voltage that is applied to motor.Particularly, at nmos pass transistor Q
4Conducting and nmos pass transistor Q
2With Q
3Under the situation of not conducting, control signal G
1Must be implemented by a pwm signal, be made nmos pass transistor Q
1ON time by control signal G
1Duty cycle determine and then the mean value of controlling and driving voltage.Yet the PWM technology causes supply-voltage source V
mAnd the excessive turbulence that is applied to the driving voltage of motor M.For the application that needs are accurately controlled motor, the PWM technology of prior art may cause some harmful effects.Thereby, a kind of control circuit of the driving voltage of low noise to motor M that provide is provided.
[summary of the invention]
A purpose of the present invention is to provide a kind of motor control circuit, and may command is used for the polarity and the order of magnitude of the driving voltage of motor.
Another object of the present invention is to provide a kind of motor control circuit, the absolute value that can be used in the driving voltage of motor is kept fixing.
Another purpose of the present invention is to provide a kind of motor control circuit, can suppress to be used for the noise of the driving voltage of motor.
According to the present invention, a kind of motor control circuit is provided, be used to supply driving voltage to a motor.Driving voltage is applied between first end points and second end points of motor.This motor control circuit comprises: a H bridge circuit, a voltage detecting circuit, an error amplifier, a feedback circuit and a state control circuit.
The H bridge circuit has first and second linear unit and first and second switch element.First linear unit and first switch element coupled in common to the first end points.Second linear unit and second switch unit coupled in common to the second end points.Voltage detecting circuit produces at least one voltage detection signal, and it represents the driving voltage of motor.Error amplifier produces at least one error signal, and it represents the difference between an at least one voltage detection signal and a command voltage signal.At least one error signal electrically is located away from first and second switch element.Feedback circuit is coupled in error amplifier to receive at least one error signal, applies at least one error signal to the first or second linear unit with selectivity.First and second switch element of state control circuit Synchronization Control and feedback circuit.
In first operating period, first switch element operate in one not conduction mode, second switch unit operations allow one at least one error signal to be applied to first linear unit in a conduction mode, feedback circuit, cause first linear unit to operate in a linear model and feedback circuit prevents that at least one error signal is applied to second linear unit.Thereby driving voltage is controlled so as to and is proportional to the command voltage signal in fact.At this moment, driving voltage makes an electric current with the motor of flowing through from the direction of first end points to the second end points.
In second operating period, first switch element operate in that conduction mode, second switch unit operations prevent that at least one error signal is applied to that first linear unit and feedback circuit allow at least one error signal in not conduction mode, feedback circuit another be applied to second linear unit, cause second linear unit to operate in linear model.Thereby driving voltage is controlled so as to and is proportional to the command voltage signal in fact.At this moment, driving voltage makes an electric current with the motor of flowing through from the direction of second end points to the first end points.
Voltage detecting circuit comprises first and second voltage divider.First voltage divider is series between first end points and ground potential, in order to export the first end points voltage division signal, as one at least one voltage detection signal.Second voltage divider is series between second end points and ground potential, in order to exporting the second end points voltage division signal, as at least one voltage detection signal another.
Error amplifier comprises first to the 3rd nmos pass transistor and first to the 3rd current mirror.The gate pole of first nmos pass transistor controlled by the first end points voltage division signal and its source-coupled in a fixed current source.The gate pole of second nmos pass transistor controlled by the second end points voltage division signal and its source-coupled in the fixed current source.The gate pole of the 3rd nmos pass transistor controlled by the command voltage signal and its source-coupled in the fixed current source.The primary current branch of first current mirror is coupled in the drain electrode of first nmos pass transistor and the drain electrode of second nmos pass transistor.The primary current branch of second current mirror is coupled in the drain electrode of the 3rd nmos pass transistor.The primary current branch of the 3rd current mirror is coupled in the image current branch of first current mirror.First output is coupled in the image current branch of second current mirror and the image current branch of the 3rd current mirror, in order to supply at least one error signal.
Second current mirror also has a paralleloscope image current branch, and parallel coupled is in the image current branch of second current mirror.The 3rd current mirror also has a paralleloscope image current branch, and parallel coupled is in the image current branch of the 3rd current mirror.Error amplifier more comprises one second output, is coupled in the paralleloscope image current branch of second current mirror and the paralleloscope image current branch of the 3rd current mirror, in order to supply another of at least one error signal.
Feedback circuit comprises first and second switching device.First switching device is coupled in this first linear unit, and is controlled by state control circuit.In first operating period, first switching device allows at least one error signal to be applied to first linear unit.In second operating period, first switching device prevents that at least one error signal is applied to first linear unit.The second switch device is coupled in second linear unit, and is controlled by state control circuit.In first operating period, the second switch device prevents that at least one error signal is applied to second linear unit.In second operating period, the second switch device allow at least one error signal another be applied to second linear unit.
State control circuit is output first to fourth state control signal synchronously, in order to first and second switching device of difference Control and Feedback circuit and first and second switch element of H bridge circuit.Each of first to fourth state control signal is a digital logic signal, has a logic high and a logic low.In first operating period, first with third state control signal be in logic low and second and the four condition control signal be in logic high.In second operating period, first with third state control signal be in logic high and second and the four condition control signal be in logic low.
Motor control circuit also comprises a braking circuit, is controlled by this state control circuit.In the 3rd operating period, braking circuit is changed at least one error signal becomes at least one brake signal, and apply at least one brake signal simultaneously to first and second linear unit via feedback circuit, cause first and second linear unit to operate in conduction mode simultaneously.In the 3rd operating period, state control circuit is controlled first and second switch element and is operated in not conduction mode.
State control circuit is also exported a brake control signal, and it is a digital logic signal, has a logic high and a logic low.Brake control signal is imported this braking circuit, makes this this at least one error signal of braking circuit conversion become this at least one brake signal.In the 3rd operating period, first to fourth state control signal is in logic low and brake control signal is in logic high.
[description of drawings]
Explanation hereinafter and accompanying drawing will make aforementioned and other purposes of the present invention, feature, more obvious with advantage.Now describe in detail according to preferred embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 shows the circuit diagram of the H bridge circuit that is used for CD-ROM drive motor of prior art.
Fig. 2 shows the circuit diagram according to an example of motor control circuit of the present invention.
Fig. 3 shows the detailed circuit diagram according to an example of error amplifier of the present invention and braking circuit.
Fig. 4 shows the sequential chart according to three kinds of modes of operation of motor control circuit of the present invention.
[embodiment]
Fig. 2 shows the circuit diagram according to an example of motor control circuit 20 of the present invention.With reference to Fig. 2, motor control circuit 20 comprises a H bridge circuit 21, a voltage detecting circuit 22, an error amplifier 23, a feedback circuit 24 and a state control circuit 25.
H bridge circuit 21 comprises two linear unit LQ
1With LQ
2And two switch element SQ
1With SQ
2Linear unit LQ
1With LQ
2In order to coupling supply-voltage source V
mWith motor M, and switch element SQ
1With SQ
2Then in order to coupling motor M and ground potential.Linear unit LQ
1With LQ
2Mode of operation comprise linear model, conduction mode, with conduction mode not, and switch element SQ
1With SQ
2Mode of operation then comprise conduction mode and conduction mode not." linear model " speech is meant the mode of operation that equivalent resistance changes in fact linearly along with control signal." conduction mode " speech is meant that equivalent resistance can ignore and be considered as the mode of operation of short circuit in fact." not conduction mode " speech is meant the mode of operation that equivalent resistance is very high and be considered as opening a way in fact.
Voltage detecting circuit 22 is in order to detect the driving voltage of motor M, promptly to put on the terminal A of motor M and the voltage between terminal B, and export the voltage detection signal V of generation table motor driving voltage at least
dInverting input (-) to error amplifier 23.The non-inverting input (+) of error amplifier 23 receives a command voltage (Command Voltage) signal V
Com, produce desired motor driving voltage according to motor control circuit 20 of the present invention in order to indication.Command voltage signal V
ComBy user decision, adjust according to application demand or feed back decision according to the operating characteristics of motor by other circuit.In error amplifier 23, at least one voltage detection signal V
dWith command voltage signal V
ComCompare mutually, thereby produce the error signal V of both differences of at least one representative
e
The state control signal S that is produced based on state control circuit 25
1With S
2, feedback circuit 24 makes at least one error signal V that is produced by error amplifier 23
eSelectivity is applied to linear unit LQ
1Or LQ
2Particularly, as state control signal S
1With S
2Indication feedback circuit 24: linear unit LQ
1Operate in linear model and linear unit LQ
2When operating in not conduction mode, feedback circuit 24 allows at least one error signal V
ePut on linear unit LQ
1But prevent at least one error signal V
ePut on linear unit LQ
2In the case, linear unit LQ
1Equivalent resistance along with at least one error signal V
eChange in fact linearly.As state control signal S
1With S
2Indication feedback circuit 24: linear unit LQ
1Operate in not conduction mode and linear unit LQ
2When operating in linear model, feedback circuit 24 prevents at least one error signal V
cPut on linear unit LQ
1But allow at least one error signal V
ePut on linear unit LQ
2In the case, linear unit LQ
2Equivalent resistance along with at least one error signal V
eChange in fact linearly.
State control circuit 25 also produces two other state control signal S
3With S
4, in order to the switch element SQ of control H bridge circuit 21
1With SQ
2, make it operate in conduction mode or conduction mode not.25 state control signal S that produce synchronously of state control circuit
1To S
4Cooperatively interact, to realize mode of operation control according to motor control circuit 20 of the present invention.
Particularly, as state control signal S
1Make feedback circuit 24 optionally apply at least one error signal V
eTo linear unit LQ
1The time, state control signal S
4Make switch element SQ
2Operate in conduction mode.At this moment, state control signal S
2With S
3Make linear unit LQ respectively
2With switch element SQ
1Operate in not conduction mode.As a result, the terminal A of motor M is via the linear unit LQ that operates in linear model
1Be coupled in supply-voltage source V
m, the terminal B of motor M then short circuit in ground potential.Because the voltage of terminal B is essentially zero, so the voltage of terminal A is motor driving voltage.In the case, drive current is with the motor M that flows through of the direction from terminal A to terminal B.As previously mentioned, the circuit feedback that constituted via voltage detecting circuit 22, error amplifier 23 and feedback circuit 24 of the change of motor driving voltage is to linear unit LQ
1Thereby, utilize linear unit LQ
1Equivalent resistance variation and control motor driving voltage and be proportional to command voltage signal V in fact
Com
On the other hand, as state control signal S
2Make feedback circuit 24 optionally apply at least one error signal V
eTo linear unit LQ
2The time, state control signal S
3Make switch element SQ
1Operate in conduction mode.At this moment, state control signal S
1With S
4Make linear unit LQ respectively
1With switch element SQ
2Operate in not conduction mode.As a result, the terminal B of motor M is via the linear unit LQ that operates in linear model
2Be coupled in supply-voltage source V
mThe terminal A of motor M then short circuit in ground potential.Because the voltage of terminal A is essentially zero, so the voltage of terminal B is motor driving voltage.In the case, drive current is with the motor M that flows through of the direction from terminal B to terminal A.As previously mentioned, the circuit feedback that constituted via voltage detecting circuit 22, error amplifier 23 and feedback circuit 24 of the change of motor driving voltage is to linear unit LQ
2Thereby, utilize linear unit LQ
2Equivalent resistance variation and control motor driving voltage and be proportional to command voltage signal V in fact
Com
Therefore, the polarity and the order of magnitude that are used for the driving voltage of motor according to motor control circuit 20 may command of the present invention.If command voltage signal V
ComBe set at a fixed value, then the absolute value that can be used in the driving voltage of motor according to motor control circuit 20 of the present invention is kept fixing.Because according to motor control circuit 20 of the present invention is to utilize linear unit LQ
1With LQ
2Linear model and obtain desired motor driving voltage, so suppress the noise of driving voltage effectively.
Should note in foundation motor control circuit 20 of the present invention switch element SQ
1With SQ
2The state control signal S that is produced by state control circuit 25
3With S
4Control, but not at least one error signal V
eEspecially, at least one error signal V
eElectrically be located away from switch element SQ
1With SQ
2At least one error signal V
eMainly via feedback circuit 24 selectivity FEEDBACK CONTROL linear unit LQ
1Or LQ
2, make it operate in linear model.
In the embodiment shown in Figure 2, linear unit LQ
1With LQ
2Must be implemented by nmos pass transistor.Linear unit LQ
1Drain coupled in supply-voltage source V
m, and its source-coupled is in the terminal A of motor M.Linear unit LQ
2Drain coupled in supply-voltage source V
m, and its source-coupled is in the terminal B of motor M.Switch element SQ
1With SQ
2Must be implemented by nmos pass transistor.Switch element SQ
1Drain coupled in the terminal A of motor M, and its source-coupled is in ground potential.Switch element SQ
2Drain coupled in the terminal B of motor M, and its source-coupled is in ground potential.
Should note because nmos pass transistor has parasitic diode D
1To D
4So H bridge circuit 21 shown in Figure 2 need not additionally be provided with free-wheel diode.If the linear unit LQ of H bridge circuit 21
1With LQ
2And switch element SQ
1With SQ
2Implemented by bipolar junction transistor, then diode D as shown in Figure 2
1To D
4Must additionally be provided with.
Voltage detecting circuit 22 is by two voltage dividers 22
1With 22
2Constitute, detect the voltage at terminal A place of motor M and the voltage at terminal B place respectively.Voltage divider 22
1By the resistance R that is series between terminal A and ground potential
1With R
3Implement.Voltage detection signal V
D1From resistance R
1With R
3Coupling point take out, the voltage ratio between the voltage at itself and terminal A place is R
3/ (R
1+ R
3).Voltage divider 22
2By the resistance R that is series between terminal B and ground potential
2With R
4Implement.Voltage detection signal V
D2From resistance R
2With R
4Coupling point take out, the voltage ratio between the voltage at itself and terminal B place is R
4/ (R
2+ R
4).Resistance R
1To R
4Be designed such that R
3/ (R
1+ R
3) equal R
4/ (R
2+ R
4).In the embodiment shown in Figure 2, voltage detection signal V
D1With V
D2Constitute previously described at least one voltage detection signal V
d, in order to represent motor driving voltage.
Though should note in the embodiment shown in Figure 2 two voltage detection signal V of voltage detecting circuit 22 outputs
D1With V
D2, but the invention is not restricted to this and must be applied to voltage detecting circuit 22 and also comprise an analog comparator, produce single voltage detection signal V in order to the difference between the voltage that obtains terminal A and terminal B place
d, represent motor driving voltage.
Though should note in the embodiment shown in Figure 2, feedback circuit 24 is under the control of state control circuit 25, determines error signal V independently
E1Whether be applied to linear unit LQ
1And determine error signal V independently
E2Whether be applied to linear unit LQ
2, but the invention is not restricted to this and must be applied to error amplifier 23 and only be provided with single output, in order to produce single error signal V
eIn the case, feedback circuit 24 is under the control of state control circuit 25, makes the single output of error amplifier 23 optionally be coupled in linear unit LQ
1Or LQ
2Thereby, carry out single error signal V
eOptionally be applied to linear unit LQ
1Or LQ
2
Because the linear unit LQ of H bridge circuit 21
1With LQ
2Operate in the linear model but not as in the prior art with PWM mode high-frequency switch between conducting and not on-state, therefore can excessive turbulence supply-voltage source V according to motor control circuit 20 of the present invention
mAnd the noise that suppresses motor driving voltage effectively.If expectation suppresses the noise of motor driving voltage to a greater degree, then feedback circuit 24 need also be provided with capacitor C
1With C
2Capacitor C
1Be coupled in linear unit LQ
1Gate pole and ground potential between, make error signal V
E1Be applied to linear unit LQ relatively lenitively
1Gate pole.Capacitor C
2Be coupled in linear unit LQ
2Gate pole and ground potential between, make error signal V
E2Be applied to linear unit LQ relatively lenitively
2Gate pole.
Also be provided with a braking circuit 26 according to motor control circuit 20 of the present invention, use so that linear unit LQ
1With LQ
2Operate in conduction mode simultaneously.Particularly, when motor control circuit 20 was carried out braking control, one brake control signal BRK was to braking circuit 26 in state control circuit 25 outputs.In response to brake control signal BRK, at least one error signal V that braking circuit 26 is produced error amplifier 23
eConvert at least one brake signal to.Under the control of state control circuit 25, switch element SQ
1With SQ
2Operate in not conduction mode, and feedback circuit 24 applies at least one brake signal simultaneously to linear unit LQ
1With LQ
2, make it operate in conduction mode simultaneously.
Particularly, in the embodiment shown in Figure 2, in response to brake control signal BRK, two inverting input short circuits that braking circuit 26 makes error amplifier 23 are in ground potential or be in and be lower than command voltage signal V
ComState.As a result, error signal V
E1With V
E2Be transformed into brake signal, and no longer be the aforesaid linear signal that is used for FEEDBACK CONTROL with logic high.In the case, state control circuit 25 is by state control signal S
1With S
2Make switching device SW
1With SW
2Not conducting simultaneously, feasible brake signal V with logic high
E1With V
E2Import linear unit LQ respectively
1With LQ
2Gate pole.Brake signal V with logic high
E1With V
E2Make linear unit LQ
1With LQ
2Operate in conduction mode, reach desired braking control.
In braking control, in order to make error signal V
E1With V
E2More promptly be transformed into the brake signal with logic high, braking circuit 26 can additionally be provided with the device of the output stage of direct departure amplifier 23, forces two output O
1With O
2Output has the brake signal V of logic high rapidly
E1With V
E2
Fig. 3 shows according to the detailed circuit diagram of error amplifier 23 of the present invention with an example of braking circuit 26.At first explanation is according to the detailed circuit of an example of error amplifier 23 of the present invention.Nmos pass transistor N
1Gate pole in order to receive voltage detection signal V
D1, nmos pass transistor N
2Gate pole in order to receive voltage detection signal V
D2, and nmos pass transistor N
3Gate pole in order to receive command voltage signal V
ComNmos pass transistor N
1To N
3Source electrode all be coupled in a fixed current source I
EaAs voltage detection signal V
D2When being zero, nmos pass transistor N
2Not conducting.In the case, voltage detection signal V
D1With command voltage signal V
ComDecision fixed current source I
EaBe allocated in nmos pass transistor N
1With N
3Current ratio.As voltage detection signal V
D2When being zero, nmos pass transistor N
2Not conducting.In the case, voltage detection signal V
D2With command voltage signal V
ComDecision fixed current source I
EaBe allocated in nmos pass transistor N
2With N
3Current ratio.
PMOS transistor P
1With P
3Constitute a current mirror, wherein PMOS transistor P
1As primary current branch and PMOS transistor P
3As image current branch.PMOS transistor P
1Be coupled in nmos pass transistor N
1With N
2, the feasible PMOS transistor P that flows through
3Electric current by mirror effect corresponding to the nmos pass transistor N that flows through
1(or N
2) electric current, in order to representative voltage detection signal V
D1(or V
D2).PMOS transistor P
2With P
4Constitute another current mirror, wherein PMOS transistor P
2As primary current branch and PMOS transistor P
4As image current branch.PMOS transistor P
2Be coupled in nmos pass transistor N
3, the feasible PMOS transistor P that flows through
4Electric current via mirror effect corresponding to the nmos pass transistor N that flows through
3Electric current, in order to represent command voltage signal V
Com
Nmos pass transistor N
4With N
5Constitute a current mirror, wherein nmos pass transistor N
4As primary current branch and nmos pass transistor N
5As image current branch.Nmos pass transistor N
4Be coupled in PMOS transistor P
3, the feasible nmos pass transistor N that flows through
5Electric current by mirror effect corresponding to the nmos pass transistor N that flows through
1(or N
2) electric current, in order to representative voltage detection signal V
D1(or V
D2).
The output O of error amplifier 23
1Be coupled in PMOS transistor P
4With nmos pass transistor N
5As voltage detection signal V
D1(or V
D2) less than command voltage signal V
ComThe time, PMOS transistor P flows through
4Electric current greater than nmos pass transistor N
5Electric current, cause a differential current from output O
1Flow out.As voltage detection signal V
D1(or V
D2) greater than command voltage signal V
ComThe time, PMOS transistor P flows through
4Electric current less than nmos pass transistor N
5Electric current, cause a differential current to flow into output O
1Therefore, error signal V
E1Differential current is implemented thus.
PMOS transistor P
5Parallel coupled is in PMOS transistor P
4, as paralleloscope image current branch, the feasible PMOS transistor P that flows through
5Electric current represent command voltage signal V
ComNmos pass transistor N
6Parallel coupled is in nmos pass transistor N
5, as paralleloscope image current branch, the feasible nmos pass transistor N that flows through
6Electric current representative voltage detection signal V
D1(or V
D2).
The output O of error amplifier 23
2Be coupled in PMOS transistor P
5With nmos pass transistor N
6As voltage detection signal V
D1(or V
D2) less than command voltage signal V
ComThe time, PMOS transistor P flows through
5Electric current greater than nmos pass transistor N
6Electric current, cause a differential current from output O
2Flow out.As voltage detection signal V
D1(or V
D2) greater than command voltage signal V
ComThe time, PMOS transistor P flows through
5Electric current less than nmos pass transistor N
6Electric current, cause a differential current to flow into output O
2Therefore, error signal V
E1Differential current is implemented thus.
For the clearer operation of understanding according to motor control circuit 20 of the present invention, now illustrate (1) according to motor control circuit 20 of the present invention with reference to Fig. 4 and make electric current drive mode of operation, (2) braking operation state and (3) and make electric current drive mode of operation from the flow through level pressure of motor M of terminal B to terminal A from the flow through level pressure of motor M of terminal A to terminal B.
As shown in Figure 4, T during operation
1In, state control signal S
1With S
3Be logic low, state control signal S
2With S
4For logic high and brake control signal BRK are logic low.Therefore, switching device SW
1With switch element SQ
1Neither conducting, switching device SW
2With switch element SQ
2All conducting and braking circuit 26 are in by (Disable) state.So because the terminal B of motor M is because short circuit is essentially zero in its voltage of ground potential, so voltage detection signal V
D2Also be zero.Error signal V
E1Be a linear signal, be in the range of linearity between logic high H and logic low L, and FEEDBACK CONTROL linear unit LQ
1Make it to operate in linear model.Error signal V
E2Because of switching device SW
2Conducting and be pulled low to ground potential.As a result, voltage detection signal V
D1Be maintained in and equal command voltage signal V in fact
ComIn other words, the voltage of the terminal A of motor M is maintained in and is proportional to command voltage signal V in fact
ComThereby, as command voltage signal V
ComWhen being a fixed value, realize making electric current from the flow through level pressure driving mode of operation of motor M of terminal A to terminal B effectively according to motor control circuit 20 of the present invention.
T during operation
2In, state control signal S
1To S
4Be all logic low, and brake control signal BRK is a logic high.Therefore, switching device SW
1With SW
2And switch element SQ
1With SQ
2Neither conducting.Braking circuit 26 makes error signal V
E1With V
E2Convert brake signal to logic high H.Brake signal V with logic high H
E1With V
E2Make linear unit LQ
1With LQ
2Enter conduction mode simultaneously.Thereby, realize braking operation state effectively according to motor control circuit 20 of the present invention.Subsidiary one carries, and the terminal A of motor M and the voltage of terminal B equal supply-voltage source V in fact at this moment
m, so voltage detection signal V
D1With V
D2Be respectively R
3/ (R
1+ R
3) * V
mWith R
4/ (R
2+ R
4) * V
m
T during operation
3In, state control signal S
1With S
3Be logic high, state control signal S
2With S
4For logic low and brake control signal BRK are logic low.Therefore, switching device SW
1With switch element SQ
1All conductings, switching device SW
2With switch element SQ
2Neither conducting and braking circuit 26 are in cut-off state.So because the terminal A of motor M is because short circuit is essentially zero in its voltage of ground potential, so voltage detection signal V
D1Also be zero.Error signal V
E1Because of switching device SW
1Conducting and be pulled low to ground potential.Error signal V
E2Be a linear signal, be in the range of linearity between logic high H and logic low L, and FEEDBACK CONTROL linear unit LQ
2Make it to operate in linear model.As a result, voltage detection signal V
D2Be maintained in and equal command voltage signal V in fact
ComIn other words, the voltage of the terminal B of motor M is maintained in and is proportional to command voltage signal V in fact
ComThereby, as command voltage signal V
ComWhen being a fixed value, realize making electric current from the flow through level pressure driving mode of operation of motor M of terminal B to terminal A effectively according to motor control circuit 20 of the present invention.
Though should note in the embodiment shown in Figure 2 linear unit LQ
1With LQ
2Be coupled in supply-voltage source V
mAnd between motor M and switch element SQ
1With SQ
2Be coupled between motor M and ground potential, but the invention is not restricted to this and must be applied to linear unit LQ
1With LQ
2Be coupled between motor M and ground potential and switch element SQ
1With SQ
2Be coupled in supply-voltage source V
mAnd between motor M.In the case, switch element SQ
1With SQ
2Conducting determine the terminal A of motor M and B respectively whether short circuit be in supply-voltage source V
m, and linear unit LQ
1With LQ
2Then provide the equivalent resistance that is subjected to FEEDBACK CONTROL respectively between the terminal A and B and ground potential of motor M.
Though disclose the present invention by preferred embodiment; right its is not in order to limit the present invention; the any technical staff in this area can do to change and revise without departing from the spirit and scope of the present invention the present invention, so protection scope of the present invention should be as the criterion with claims.
Claims (13)
1, a kind of motor control circuit is used to supply driving voltage to a motor, and this motor has one first end points and one second end points, and this driving voltage is applied between this first end points and this second end points, and this motor control circuit comprises:
One H bridge circuit, have one first linear unit, one second linear unit, one first switch element, with a second switch unit, this first linear unit and this first switch element coupled in common to this first end points and this second linear unit and this second switch unit coupled in common to this second end points;
One voltage detecting circuit, in order to produce at least one voltage detection signal, it represents this driving voltage of this motor;
One error amplifier, in order to produce at least one error signal, it represents the difference between this an at least one voltage detection signal and a command voltage signal, wherein this at least one error signal electrically be located away from this first with this second switch unit;
One feedback circuit is coupled in this error amplifier receiving this at least one error signal, with selectivity apply this at least one error signal to this first or this second linear unit; And
One state control circuit, in order to Synchronization Control this first with this second switch unit and this feedback circuit, make in one first operating period, this first switch element operates in a conduction mode not, this second switch unit operations is in a conduction mode, this feedback circuit allows in this at least one error signal to be applied to this first linear unit, cause this first linear unit to operate in a linear model, and this feedback circuit prevents that this at least one error signal is applied to this second linear unit, is proportional to this command voltage signal in fact thereby control this driving voltage.
2, according to the motor control circuit of claim 1, wherein:
This voltage detecting circuit comprises:
One first voltage divider is series between this first end points and a ground potential, in order to export one first end points voltage division signal, and as one in this at least one voltage detection signal, and
One second voltage divider is series between this second end points and this ground potential, in order to exporting one second end points voltage division signal, as in this at least one voltage detection signal another.
3, according to the motor control circuit of claim 2, wherein:
This error amplifier comprises:
One first nmos pass transistor, have a gate pole, one the drain electrode and one source pole, this gate pole controlled by this first end points voltage division signal and this source-coupled in a fixed current source;
One second nmos pass transistor, have a gate pole, one the drain electrode and one source pole, this gate pole controlled by this second end points voltage division signal and this source-coupled in this fixed current source;
One the 3rd nmos pass transistor, have a gate pole, one the drain electrode and one source pole, this gate pole controlled by this command voltage signal and this source-coupled in this fixed current source;
One first current mirror has a primary current branch and an image current branch, and this primary current branch is coupled in this drain electrode of this first nmos pass transistor and this drain electrode of this second nmos pass transistor;
One second current mirror has a primary current branch and an image current branch, and this primary current branch is coupled in this drain electrode of the 3rd nmos pass transistor;
One the 3rd current mirror has a primary current branch and an image current branch, and this primary current branch is coupled in this image current branch of this first current mirror; And
One first output is coupled in this image current branch of this second current mirror and this image current branch of the 3rd current mirror, in order to this in this at least one error signal to be provided.
4, according to the motor control circuit of claim 3, wherein:
This primary current branch of this first current mirror is implemented by one the one PMOS transistor, the one PMOS transistor has a gate pole, a drain electrode and an one source pole, and it is to be coupled in this drain electrode of this drain electrode of this first nmos pass transistor and this second nmos pass transistor and this source-coupled in a fixed voltage source that this gate pole is coupled in this drain electrode, this leakage;
This primary current branch of this second current mirror is implemented by one the 2nd PMOS transistor, the 2nd PMOS transistor has a gate pole, a drain electrode and an one source pole, this gate pole be coupled in this drain electrode, this drain coupled in this drain electrode of the 3rd nmos pass transistor and this source-coupled in this fixed voltage source;
This image current branch of this first current mirror is implemented by one the 3rd PMOS transistor, the 3rd PMOS transistor has a gate pole, a drain electrode and an one source pole, this gate pole, this drain coupled that this gate pole is coupled in this primary current branch of this first current mirror in this primary current branch of the 3rd current mirror and this source-coupled in this fixed voltage source; And
This image current branch of this second current mirror is implemented by one the 4th PMOS transistor, the 4th PMOS transistor has a gate pole, a drain electrode and an one source pole, this gate pole, this drain coupled that this gate pole is coupled in this primary current branch of this second current mirror in this first output of this error amplifier and this source-coupled in this fixed voltage source.
5, according to the motor control circuit of claim 3, wherein:
This primary current branch of the 3rd current mirror is implemented by one the 4th nmos pass transistor, the 4th nmos pass transistor has a gate pole, a drain electrode and an one source pole, this gate pole be coupled in this drain electrode, this drain coupled in this image current branch of this first current mirror and this source-coupled in a ground potential, and
This image current branch of the 3rd current mirror is implemented by one the 5th nmos pass transistor, the 5th nmos pass transistor has a gate pole, a drain electrode and an one source pole, this gate pole, this drain coupled that this gate pole is coupled in the 4th nmos pass transistor in this image current branch of this second current mirror and this source-coupled in this ground potential.
6, according to the motor control circuit of claim 1, wherein:
This state control circuit also Synchronization Control this first with this second switch unit and this feedback circuit, make in one second operating period, this first switch element operate in this conduction mode, this second switch unit operations in this not conduction mode, this feedback circuit prevent that this at least one error signal is applied to that this first linear unit and this feedback circuit allow this at least one error signal another be applied to this second linear unit, cause this second linear unit to operate in this linear model, be proportional to this command voltage signal in fact thereby control this driving voltage.
7, according to the motor control circuit of claim 6, wherein:
This second current mirror also has a paralleloscope image current branch, and parallel coupled is in this image current branch of this second current mirror;
The 3rd current mirror also has a paralleloscope image current branch, and parallel coupled is in this image current branch of the 3rd current mirror; And
This error amplifier more comprises one second output, is coupled in this paralleloscope image current branch of this second current mirror and this paralleloscope image current branch of the 3rd current mirror, in order to supply this at least one error signal this another.
8, according to the motor control circuit of claim 6, wherein:
This feedback circuit comprises:
One first switching device, be coupled in this first linear unit, and controlled by this state control circuit, in order in this first operating period, to allow this of this at least one error signal to be applied to this first linear unit, and prevent that in this second operating period this at least one error signal is applied to this first linear unit, and
One second switch device, be coupled in this second linear unit, and controlled by this state control circuit, in order to preventing that in this first operating period this at least one error signal is applied to this second linear unit, and in this second operating period, allow this at least one error signal this another be applied to this second linear unit.
9, according to the motor control circuit of claim 6, wherein:
This feedback circuit comprises:
One first electric capacity is coupled in this first linear unit, in order in this first operating period, makes this of this at least one error signal to be applied to this first linear unit relatively gentlely, and
One second electric capacity is coupled in this second linear unit, in order in this second operating period, make this at least one error signal this another be applied to this second linear unit relatively gentlely.
10, according to the motor control circuit of claim 6, wherein:
This state control circuit is output first to fourth state control signal synchronously, in order to control respectively this feedback circuit and this H bridge circuit this first with this second switch unit, wherein this first to each of this four condition control signal be a digital logic signal, have a logic high and a logic low, make:
In this first operating period, this first with this third state control signal be in this logic low and this second with this four condition control signal be in this logic high, and
In this second operating period, this first with this third state control signal be in this logic high and this second with this four condition control signal be in this logic low.
11, according to the motor control circuit of claim 1, also comprise:
One braking circuit, controlled by this state control circuit, make in one the 3rd operating period, this this at least one error signal of braking circuit conversion becomes at least one brake signal, and via this feedback circuit apply simultaneously this at least one brake signal to this first with this second linear unit, cause this first with this second linear unit operate in this conduction mode simultaneously, and
In the 3rd operating period, this state control circuit control this first with this second switch unit operations in this conduction mode not.
12, according to the motor control circuit of claim 11, wherein:
This error amplifier has at least one inverting input, in order to receiving this at least one voltage detection signal respectively, and a non-inverting input, and in order to receiving this command voltage signal, and
In the 3rd operating period, this braking circuit makes this at least one inverting input short circuit of this error amplifier in this ground potential, makes that this at least one error signal is converted into this at least one brake signal.
13, according to the motor control circuit of claim 11, wherein:
This state control circuit is exported first to fourth state control signal and a brake control signal, this first to this four condition control signal in order to control respectively this feedback circuit and this H bridge circuit this first with this second switch unit, this brake control signal is imported this braking circuit, make this this at least one error signal of braking circuit conversion become this at least one brake signal, wherein this first to each of this four condition control signal and this brake control signal be a digital logic signal, have a logic high and a logic low, make:
In this first operating period, this first is in this logic low with this third state control signal, this second is in this logic high and this brake control signal is in this logic low with this four condition control signal, and
In the 3rd operating period, this first is in this logic low and this brake control signal is in this logic high to this four condition control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100334846A CN1322664C (en) | 2004-04-09 | 2004-04-09 | Motor controlling circuit with controllable driven voltage supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100334846A CN1322664C (en) | 2004-04-09 | 2004-04-09 | Motor controlling circuit with controllable driven voltage supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1681194A true CN1681194A (en) | 2005-10-12 |
| CN1322664C CN1322664C (en) | 2007-06-20 |
Family
ID=35067657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100334846A Expired - Fee Related CN1322664C (en) | 2004-04-09 | 2004-04-09 | Motor controlling circuit with controllable driven voltage supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1322664C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237850A (en) * | 2010-05-05 | 2011-11-09 | 普诚科技股份有限公司 | Motor control circuit applied to multiple control modes |
| CN103326635A (en) * | 2012-03-23 | 2013-09-25 | 海洋王照明科技股份有限公司 | Direct current motor braking circuit |
| CN106124840A (en) * | 2016-06-27 | 2016-11-16 | 成都芯源系统有限公司 | Current detection circuit |
| CN108696212A (en) * | 2017-03-31 | 2018-10-23 | 三星电机株式会社 | Equipment for driving actuator |
| CN113314518A (en) * | 2020-02-26 | 2021-08-27 | 圣邦微电子（北京）股份有限公司 | Layout of motor H-bridge drive circuit chip |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4066945A (en) * | 1976-03-31 | 1978-01-03 | The Bendix Corporation | Linear driving circuit for a d.c. motor with current feedback |
| JP3271478B2 (en) * | 1995-07-19 | 2002-04-02 | 松下電器産業株式会社 | Current command type PWM inverter |
-
2004
- 2004-04-09 CN CNB2004100334846A patent/CN1322664C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237850A (en) * | 2010-05-05 | 2011-11-09 | 普诚科技股份有限公司 | Motor control circuit applied to multiple control modes |
| CN102237850B (en) * | 2010-05-05 | 2013-07-31 | 普诚科技股份有限公司 | Motor control circuit applied to multiple control modes |
| CN103326635A (en) * | 2012-03-23 | 2013-09-25 | 海洋王照明科技股份有限公司 | Direct current motor braking circuit |
| CN103326635B (en) * | 2012-03-23 | 2016-12-21 | 海洋王照明科技股份有限公司 | Direct current generator braking circuit |
| CN106124840A (en) * | 2016-06-27 | 2016-11-16 | 成都芯源系统有限公司 | Current detection circuit |
| CN106124840B (en) * | 2016-06-27 | 2019-01-15 | 成都芯源系统有限公司 | Current detection circuit |
| CN108696212A (en) * | 2017-03-31 | 2018-10-23 | 三星电机株式会社 | Equipment for driving actuator |
| CN113314518A (en) * | 2020-02-26 | 2021-08-27 | 圣邦微电子（北京）股份有限公司 | Layout of motor H-bridge drive circuit chip |
| CN113314518B (en) * | 2020-02-26 | 2023-10-13 | 圣邦微电子（北京）股份有限公司 | Motor H bridge driving circuit chip layout |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1322664C (en) | 2007-06-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1320298A (en) | Methods and apparatus for reducing mosfet body diode conduction in a half-bridge configuration | |
| CN1238960C (en) | Frequency converter device | |
| CN1129969C (en) | Reference voltage semiconductor device | |
| CN1674423A (en) | DC-DC converter and control method thereof | |
| CN1780124A (en) | Semiconductor device | |
| CN1574577A (en) | Switching regulator | |
| CN1805259A (en) | Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit | |
| US7586276B2 (en) | Electronically commutated motor and method for controlling the same | |
| JP2006314154A (en) | Power converter | |
| CN1578084A (en) | Semiconductor device including dc-dc converter control circuit | |
| CN86106600A (en) | Brushless motor drive circuit | |
| CN1567690A (en) | Synchronous rectification supply converter controlled by current transformer | |
| CN1320740C (en) | Motor controlling circuit with controllable driven current supply | |
| US20130009675A1 (en) | Gate driver | |
| JP2011019358A (en) | Controller of power conversion circuit | |
| CN1881786A (en) | A power multiplier system and method | |
| AU2012220887A1 (en) | Driver circuit for a semiconductor power switch | |
| CN1681194A (en) | Motor controlling circuit with controllable driven voltage supply | |
| CN1405970A (en) | Drive circuit of actuating device | |
| DE102017126587A1 (en) | Motor and motor driver circuit | |
| CN1065689C (en) | Inverter driving circuit for brushless D. C. motor | |
| CN1941589A (en) | Electric power converter circuit | |
| US5491392A (en) | Power source regenerative apparatus | |
| US20050226018A1 (en) | Motor control circuit for supplying a controllable driving voltage | |
| JP6469332B1 (en) | Electric motor drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: Hsinchu City, Taiwan, China Patentee after: Global Mixed-mode Technology Inc. Address before: Hsinchu, Taiwan Province Patentee before: Yuanchuang Science and Technology Co., Ltd. |
|
| C56 | Change in the name or address of the patentee |
Owner name: ZHIXIN TECHNOLOGY CO., LTD. Free format text: FORMER NAME: YUANCHUANG TECHNOLOGY CO., LTD. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070620 |