CN102820842A - Motor driving device and lockout protection and standby control circuit for same - Google Patents
Motor driving device and lockout protection and standby control circuit for same Download PDFInfo
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- CN102820842A CN102820842A CN2011101555140A CN201110155514A CN102820842A CN 102820842 A CN102820842 A CN 102820842A CN 2011101555140 A CN2011101555140 A CN 2011101555140A CN 201110155514 A CN201110155514 A CN 201110155514A CN 102820842 A CN102820842 A CN 102820842A
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Abstract
A motor driving device comprises a lockout protection unit, a standby mode judging unit and a motor control circuit, wherein the lockout protection unit receives a hall signal and generates a lockout signal according to the hall signal; the standby mode judging unit receives a pulse width modulation signal and the lockout signal from the lockout protection unit and generates a standby mode control signal according to the pulse width modulation signal and the lockout signal; the lockout protection unit determines whether to stop generating the lockout signal according to the standby mode control signal; and the motor control circuit receives the pulse width modulation signal and the standby mode control signal to control a motor to rotate and determines the operation mode of the motor according to the standby mode control signal and the lockout signal. According to the lockout protection unit and the lockout protection and standby control circuit for the same, operations of motor lockout protection and standby modes are coordinated, and a driving circuit can automatically enter or exit out of a standby mode.
Description
Technical field
The present invention relates to a kind of motor drive, particularly a kind of motor drive that utilizes pulse width modulation signal controlling motor rotary speed.
Background technology
Utilize the technology of pulse width modulation signal controlling motor rotary speed to be widely used in the d.c. motor drive circuit.This techniques make use frequency is far above the pulse width modulation signal of motor rate of phase change; Through the work period (duty cycle) of adjustment pulse width modulation signal; Can adjust the charging interval of charging current for motor coil, and then the size of control coil electric current and motor rotary speed.
For the d.c. motor drive circuit, there are two important motor operation states need include consideration in.At first, under the situation that motor need not operate for a long time, drive circuit must get into standby mode (standby mode) to save power consumption in good time, gets ready for motor startup demand suddenly simultaneously.In addition, receive that external force stops and under the situation about can't rotate smoothly, drive circuit must correctly be judged the phenomenon of this motor locking at motor, and change the charging behavior of charging current, to prevent overheated damage for motor coil.
With regard to the former, typical method is to be the duration of electronegative potential through calculating the pulse width modulation signal, judges whether the d.c. motor drive circuit need get into standby mode.When the pulse width modulation signal is time of electronegative potential to surpass a Preset Time length, the d.c. motor drive circuit promptly gets into standby mode, to save power consumption.
With regard to the latter, typical method is when motor stops operating because of external force, imposes special drive controlling.For instance; Detecting motor locking back (being that motor stopped operating above a scheduled time); Promptly stop pulse width modulation signal originally, and change with the pulse signal replacement of a fixed cycle, so that after the revolution removal of obstacle, can recover the motor normal rotation.
As aforementioned, the locking defencive function judges through the hall signal (hall signal) of detecting from motor whether the rotary state of motor locks protection with decision.Standby mode then is to be the duration of electronegative potential through detecting pulse width modulation signal, judges whether to get into standby mode.Under the locking guard mode, the pulse width modulation signal the when pulse signal that drive circuit produced is different from standby mode and normal rotation.Therefore, how suitably to coordinate the operation of motor locking protection and standby mode, be this area one major issue.
Summary of the invention
In view of this; Main purpose of the present invention is to propose a kind of motor drive and the locking protection and the readiness control circuit that are used for this motor drive; Lock the operation of protecting with standby mode to coordinate motor, and get into automatically in due course or the disengaging standby mode.
For achieving the above object, the present invention provides a kind of motor drive.This motor drive comprises locking protected location, a standby mode judging unit and a motor control circuit.Wherein, the locking protected location receives a hall signal, and produces a locking signal according to this.The standby mode judging unit receives a pulse width modulation signal and locking signal from the locking protected location, and produces a standby mode control signal according to this pulse width modulation signal and locking signal.The locking protected location then is according to this standby mode control signal, and whether decision stops to produce locking signal.Motor control circuit received pulse width modulation signal and standby mode control signal are with the control revolution, and the aforementioned standby mode control signal of foundation and its operating mode of locking signal decision.
In other words, a kind of motor drive, to control the rotation of a motor, this motor drive comprises: a locking protected location, according to a motor rotation signal, to produce a locking signal; One standby mode judging unit; Receive a pulse width modulation signal and this locking signal; And produce a standby mode control signal according to this pulse width modulation signal and this locking signal, and this locking protected location is according to this standby mode control signal, and whether decision stops this locking signal; And a motor control circuit, according to the rotation of this pulse width modulation signal and this motor of this standby mode control signal control.
The present invention also provides a kind of locking protection and readiness control circuit that is used for motor drive.This locking protection comprises a locking protected location and a standby mode judging unit with readiness control circuit.The locking protected location produces a locking signal according to a motor rotation signal.The standby mode judging unit receives pulse width modulation signal and the aforementioned locking signal in order to the control revolution, and produces a standby mode control signal according to pulse width modulation signal and locking signal.In addition, the locking protected location is according to the standby mode control signal from the standby mode judging unit, and whether decision stops locking signal.
In other words; A kind of locking protection and readiness control circuit that is used for motor drive; This motor drive is according to a pulse width modulation signal controlling one revolution; This locking protection comprises with readiness control circuit: a locking protected location, according to a motor rotation signal, to produce a locking signal; An and standby mode judging unit; Receive this pulse width modulation signal and this locking signal; And produce a standby mode control signal according to this pulse width modulation signal and this locking signal, and this locking protected location is according to this standby mode control signal, and whether decision stops this locking signal.
A kind of motor drive that the present invention proposes and the locking protection and the readiness control circuit that are used for this motor drive lock the operation of protecting with standby mode to coordinate motor, and get into automatically in due course or the disengaging standby mode.
Can further be understood according to following detailed description and appended accompanying drawing about advantage of the present invention and spirit.
Description of drawings
Fig. 1 is the sketch map of motor drive one preferred embodiment of the present invention;
Figure 1A locks the sketch map of protection and readiness control circuit one preferred embodiment for the present invention;
Figure 1B locks the sketch map of the logical circuit embodiment one of protection and readiness control circuit for the present invention;
Fig. 1 C locks the sketch map of the logical circuit embodiment two of protection and readiness control circuit for the present invention;
Fig. 2 is the sequential chart of locking protection and readiness control circuit one preferred embodiment of Figure 1A;
Fig. 3 locks the sketch map of protected location one preferred embodiment for the present invention;
Fig. 4 is the sequential chart of locking protected location one preferred embodiment of Fig. 3;
Fig. 5 is the sequential chart of backward current preventing circuit of the present invention and motor drive one preferred embodiment;
Fig. 6 controls the commutation flow process that motor control circuit carries out commutation for the present invention through the end-point voltage of detecting motor coil.
[main element description of reference numerals]
Locking protection and readiness control circuit 120
Revolution circuit for detecting 140
Square-wave signal FG
Hall signal H+, H-
Locking protected location 121
Standby mode judging unit 123
Locking signal LOCK
Pulse width modulation signal PWM
Standby mode control signal STB
Reverser 128
Oscillator signal OSC
Delay circuit 125
Reverser 126
Reverse impulse width modulation signal PWMB
Control signal EN
First counter 1222
Second counter 1224
The 3rd counter 1226
Output signal C1, C2, C3
Single-phase motor drive circuit 180
Switch element M1, M2, M3, M4
Backward current preventing circuit 190
Contact VA, VB
Gate control signal A, B, C, D
Power end Vm
Discharge control signal Discharge
Standby mode judging unit 223
NOR gate 2242,2244,2246
Locking protected location 221
Locking protection circuit 222
Standby mode judging unit 323
Locking protected location 321
Locking protection circuit 322
Embodiment
Fig. 1 is the sketch map of DC motor drive device one preferred embodiment of the present invention.As shown in fig. 1, this DC motor drive device has a locking protection and readiness control circuit 120, a revolution circuit for detecting 140 and a motor control circuit 160.
The rotary state of revolution circuit for detecting 140 detecting motors is to produce a square-wave signal FG (that is motor rotation signal).The revolution circuit for detecting 140 of present embodiment has the rotary state of a Hall detector 142 in order to the detecting motor.When revolution, Hall detector 142 can be exported a pair of frequency hall signal H+ identical with motor rotary speed, H-.Hall signal H+, H-promptly can produce the interdependent square-wave signal FG of frequency and motor rotary speed after changing through hysteresis comparator 144.The locking protection can judge whether revolution exists obstruction according to this square-wave signal FG with readiness control circuit 120.
The locking protection has a locking protected location 121 and a standby mode judging unit 123 with readiness control circuit 120.Wherein, the square-wave signal FG that locking protected location 121 receives from revolution circuit for detecting 140 is to produce a locking signal LOCK.In order to prevent to produce erroneous judgement, has a counter (figure does not show) in the locking protected location 121, to calculate the time span that motor stops operating.Detect motor at locking protected location 121 and stop operating above after one first scheduled time length, promptly produce locking signal LOCK, notice motor control circuit 160 starts locking protection (lock protection) functions.For instance, motor control circuit 160 is after receiving locking signal LOCK, and the pulse signal of a fixed cycle capable of using replaces pulse width modulation signal PWM originally and comes CD-ROM drive motor to rotate, and burns circuit to prevent long-time charging, reduces power consumption simultaneously.In addition, after the rotation removal of obstacle of motor, the pulse signal of fixed cycle also can make motor recover normal rotation automatically.
Standby mode judging unit 123 receives pulse width modulation signal PWM and locking signal LOCK from the locking protected location; And producing a standby mode control signal STB according to this pulse width modulation signal PWM and locking signal LOCK, notice motor control circuit 160 gets into standby modes.In addition, locking protected location 121 is also according to the standby mode control signal STB from standby mode judging unit 123, and whether decision stops to produce locking signal LOCK.For instance; When standby mode control signal STB is shown as standby mode; Locking protected location 121 stops to produce locking signal LOCK immediately; And after standby mode control signal STB display system returned back to normal mode from standby mode, locking protected location 121 began to calculate first scheduled time length once again.
Figure 1A locks the circuit diagram of protection and readiness control circuit 120 1 preferred embodiments for the present invention.Shown in Figure 1A, locking protected location 121 has a locking protection circuit 122, an oscillator 127 and a reverser 128.The square-wave signal FG that locking protection circuit 122 receives from revolution circuit for detecting 140, its inside also has a counter.Oscillator 127 is in order to produce counter required oscillator signal OSC computing time.Locking protection circuit 122 detects motor and stops operating above after one first scheduled time length, produces locking signal LOCK immediately.
Standby mode judging unit 123 has a delay circuit (De-glitch) 125, a reverser 126, a logical circuit 124.Delay circuit 125 is in order to prevent the influence of noise for pulse width modulation signal PWM.Reverser 126 is to convert reverse impulse width modulation signal PWMB in order to the pulse width modulation signal PWM with delay circuit 125 outputs.Logical circuit 124 (a for example flip-flop circuit (flip-flop)) receives this reverse impulse width modulation signal PWMB and from the locking signal LOCK that locks protected location 121, produces standby mode control signal STB according to this.
The locking protection circuits 122 that lock in the protected location 121 receive this standby mode control signal STB through a reverser 128, and whether stop to produce the calculating that locking signal LOCK also locks guard time (being aforementioned first scheduled time length) again according to this standby mode control signal STB decision.For instance; When standby mode control signal STB is shown as standby mode; Locking protected location 121 stops to produce locking signal LOCK immediately; And after standby mode control signal STB display system returned back to normal mode from standby mode, locking protected location 121 began to calculate first scheduled time length once again.
Figure 1B and Fig. 1 C show two various embodiment of logical circuit of the present invention.Shown in Figure 1B, in embodiment one, standby mode judging unit 223 has a logical circuit 224 and a delay circuit 225.This logical circuit 224 is by 2248 formations of 2242,2244,2246 and reversers of three NOR gates (NOR).Locking signal LOCK from locking protected location 221 inputs to NOR gate 2242 through reverser 2248; This NOR gate 2242 receives the pulse width modulation signal PWM from delay circuit 225 simultaneously; And when the reverse signal of pulse width modulation signal PWM and locking signal LOCK is electronegative potential, the output high potential signal.
NOR gate 2244 and 2246 constitutes a NOR gate latch circuit (RS latch).Its end of resetting is the pulse width modulation signal PWM that receives from delay circuit 225, and setting end then is the output signal that receives from NOR gate 2242.When pulse width modulation signal PWM is an electronegative potential; And the signal of setting end is that high potential is to show that locking signal LOCK is a high potential; The output of this NOR gate latch circuit promptly can be exported the standby mode control signal STB of high potential, and reporting system gets into holding state.
The locking protection circuits 222 that lock in the protected location 221 receive standby mode control signal STB through reverser 228, and whether stop to produce the calculating that locking signal LOCK also locks guard time again according to this standby mode control signal STB decision.
Shown in Fig. 1 C, in embodiment two, standby mode judging unit 323 has a logical circuit 324 and a delay circuit 325.This logical circuit 324 is by 3248 formations of 3242,3244,3246 and reversers of three NAND gates (NAND).Pulse width modulation signal PWM from delay circuit 325 converts reverse impulse width modulation signal PWMB into via reverser 3248.Locking signal LOCK from locking protected location 321 inputs to NAND gate 3242.This NAND gate 3242 receives the reverse impulse width modulation signal PWMB from reverser 3248 simultaneously, and when reverse impulse width modulation signal PWMB and locking signal LOCK are high potential, the output low-potential signal.
The embodiment that is different from Figure 1A and Figure 1B; In the present embodiment; Locking protection circuit 322 in the locking protected location 321 does not pass through reverser; Directly receive standby mode control signal STB, and whether stop to produce the calculating that locking signal LOCK also locks guard time again according to this standby mode control signal STB decision.
Fig. 2 is the sequential chart of locking protection and readiness control circuit 120 1 preferred embodiments of Figure 1A.As shown in Figure 2, not during CD-ROM drive motor, be electronegative potential (correspondence so far stops driving condition) behind the pulse width modulation signal PWM of extraneous input for a long time, reverse impulse width modulation signal PWMB then is a high potential.Simultaneously, because motor control circuit 160 does not receive the pulse width modulation signal PWM of high potential, the rotation of motor also can stop.
The high potential standby mode control signal STB that logical circuit 124 is exported also is used for controlling the running of locking protected location 121 except getting into the standby mode in order to control motor control circuit 160.The standby mode control signal STB of high potential converts the control signal EN of electronegative potential into through a reverser 128.After locking protection circuit 122 receives the control signal EN of this electronegative potential, stop immediately producing locking signal LOCK, and remove its inner enumeration data.Therefore, under standby mode, logical circuit 124 continues the standby mode control signal STB of output high potential, and locking protected location 121 just can not produce locking signal LOCK yet.
When pulse width modulation signal PWM changes high potential into to restart motor (promptly recovering the driven state); Logical circuit 124 is according to the reverse impulse width modulation signal PWMB that changes electronegative potential into; Stop to export the standby mode control signal STB of high potential, make motor control circuit 160 recover normal operation.At the same time, control signal EN also can convert high potential into, makes locking protection circuit 122 recover normal operation.
As shown in Figure 2, the pulse width modulation signal PWM of input is a high potential in the external world, but under the situation that square-wave signal FG demonstration motor rotates not yet, representes that promptly motor is hindered.Locking protected location 121 detect motor stop operating reach first scheduled time length T 1 after, produce the locking signal LOCK of high potential immediately.At this moment; Because the extraneous pulse width modulation signal PWM that continues the input high potential; Therefore, logical circuit 124 can't produce the standby mode control signal STB of high potential, but the standby mode control signal STB display system of output electronegative potential is in normal mode.Motor control circuit 160 receives this locking signal LOCK, changes its motor driven mode immediately.For instance, the pulse signal of a fixed cycle capable of using replaces pulse width modulation signal PWM originally, burns circuit to prevent long-time charging, and reduces power consumption.
Fig. 3 is the sketch map of locking protection circuit 122 1 preferred embodiments of the present invention.As shown in Figure 3, this locking protection circuit 122 has one first counter 1222, one second counter 1224 and one the 3rd counter 1226.As shown in Figure 3, when square-wave signal FG was high potential, first counter 1222 was reset, and after accomplishing counting, produced the output signal C1 of high potential.When square-wave signal FG was electronegative potential, second counter 1224 was reset, and after accomplishing counting, produced the output signal C2 of high potential.Therefore, no matter square-wave signal FG rests on high potential or electronegative potential, have at least a counter after counting is accomplished, can produce the output signal C1 of high potential, C2 is to produce the locking signal LOCK of high potential.
When locking signal LOCK changed high potential into, the 3rd counter 1226 began counting, and after accomplishing counting, produced high potential output signal C3, and reset first counter 1222 and second counter 1224 change electronegative potential into to force locking signal LOCK.After locking signal LOCK changed electronegative potential into, the 3rd counter 1226 of can resetting again made output signal C3 change electronegative potential into.
Fig. 4 is the sequential chart of locking protection circuit 122 1 preferred embodiments of the present invention.When square-wave signal FG switched to high potential, first counter 1222 was reset; When square-wave signal FG switched to electronegative potential, second counter 1224 was reset.Suppose between the count block of first counter 1222 and second counter 1224 to be Ton, promptly can begin counting after first counter 1222 and second counter 1224 are reset, after accomplishing counting, just can produce high potential output signal.Among Fig. 4, square-wave signal FG stops at electronegative potential, and therefore, first counter 1222 can preferentially be accomplished counting, and the output signal C1 of output high potential, produces the locking signal LOCK of high potential simultaneously, and notice motor control circuit 160 stops motor coil 170 power supplies.
Suppose the interval Toff of being of timing of the 3rd counter 1226.When locking signal LOCK changed high potential into, the 3rd counter 1226 began counting.After the 3rd counter 1226 was accomplished counting, the 3rd counter 1226 produced high potential output signal C3, reset first counter 1222 and second counter 1224 immediately.After first counter 1222 and second counter 1224 receive high potential output signal C3, stop to produce the output signal C1 of high potential immediately, C2, and the calculating of the interval Ton that picks up counting again.Because output signal C1 and C2 are electronegative potential, locking signal LOCK can change electronegative potential into.The locking signal LOCK of this electronegative potential makes output signal C3 change electronegative potential into again in order to the 3rd counter 1226 of resetting.
In the interval Ton of timing, no matter be first counter 1222 or second counter 1224, all do not export the output signal C1 of high potential, C2, locking signal LOCK can maintain electronegative potential.Behind first counter 1222 and second counter, 1224 completion countings, if motor still is in the lock state, promptly can produces the output signal C1 of high potential again, and make locking signal LOCK change high potential into, repeat the calculating of the interval Toff of aforementioned timing.Otherwise if the revolution obstacle is got rid of, first counter 1222 and second counter 1224 are constantly reset by square-wave signal FG, and can not produce the output signal C1 of high potential, C2.At this moment, motor control circuit 160 rotates according to pulse width modulation signal pwm motor.
According to this, under the blocked situation of motor, the locking signal LOCK of 122 output fixed cycles of locking protection circuit of the present invention.160 of motor control circuits are to utilize this locking signal to change motor driven mode originally.When locking signal LOCK was in high potential, motor control circuit 160 stopped motor coil 170 chargings.When locking signal LOCK was in electronegative potential, motor control circuit then was 160 to keep its normal operation.Like this alternate run can avoid motor coil 170 to overcharge and the possibility of burning.
As shown in Figure 1, motor control circuit 160 is through a single-phase motor drive circuit 180 control revolution.This single-phase motor drive circuit 180 has four switch element M1, M2, and M3, M4 constitutes bridge circuit (H-bridge) with CD-ROM drive motor.Its running can be divided into two different conducting phase places (phase), is the first conducting phase place (phase I) when switch element M1 and M4 conducting, is the second conducting phase place (phase II) when switch element M2 and M3 conducting.
But; When the first conducting phase place switches to the second conducting phase place, since the inductive of motor coil 170, switch element M2; The electric current of M3 conducting moment still remains on the saturation current value; And right-hand the flowing in Fig. 1, thereby can produce backward current and recharge to power end Vm, and power end Vm voltage is risen surpass withstand voltage and cause circuit burnout.For head it off, DC motor drive device of the present invention has a backward current preventing circuit 190.The magnitude of voltage Va at this backward current preventing circuit 190 detecting motor coils 170 two ends, Vb, and, judge switch element M1, M2, M3, the conducting time point of M4 according to the difference of these two magnitude of voltage Va and Vb.
Fig. 5 is the sequential mode chart of each signal of backward current preventing circuit 190 of the present invention and motor drive circuit 180.Voltage signal A among Fig. 5, B, C, D represent each switch element M1, M2 respectively; M3, the gate control signal of M4, the coil current of current i (motor) expression motor, current i (M1), i (M2); I (M3), i (M4) represent each switch element M1 that flows through, M2, M3, the electric current of M4 respectively.Va representes the voltage of the contact VA of switch element M1 and M3, and Vb representes the voltage of the contact VB of switch element M2 and M4, and Va and Vb also represent the voltage at motor two ends.
Fig. 6 then is through this backward current preventing circuit 190 control switch element M1, M2, and M3, the ON time of M4 is to carry out the schematic flow sheet of commutation.Please with reference to shown in Figure 5, when the first conducting phase place, gate control signal A is an electronegative potential simultaneously, and D is a high potential, respectively control switch element M1 and M4 conducting.At this moment, coil current i (motor) is by the left side among Fig. 5 flow to the right (this sense of current just is defined as).
At the end, gate control signal A switches to high potential off switch element M1 during the first conducting phase place, and gate control signal C switches to high potential turn-on switch component M3, and gets into interdischarge interval.At this moment, power end Vm stops coil power supply, and but, because the inductance characteristic of motor coil 170, coil current i (motor) continues and can flow to switch element M4, and the voltage Va of left end point VA that makes motor coil 170 is for negative, and the voltage Vb of right endpoint VB is for just.Therefore, the voltage difference (Va-Vb) at motor coil 170 two ends is for negative, and the voltage difference (Va-Vb) at motor coil 170 two ends can along with the discharging action of motor coil 170 toward zero near.
During less than one first default reference voltage, backward current preventing circuit 190 produces a discharge control signal Discharge at the absolute value of voltage difference (Va-Vb).After motor control circuit 160 receives this discharge control signal Discharge, gate control signal B is switched to electronegative potential with turn-on switch component M2, and gate control signal D is switched to electronegative potential with off switch element M4, to switch to the second conducting phase place.
At the end, gate control signal B switches to high potential off switch element M2 during the second conducting phase place, and gate control signal D switches to high potential turn-on switch component M4, and gets into interdischarge interval.At this moment, power end Vm stops coil power supply, and but, because the inductance characteristic of motor coil 170, coil current i (motor) continues and can flow to switch element M3, and the voltage Va of left end point VA that makes motor coil 170 is being for just, and the voltage Vb of right endpoint VB is for bearing.Therefore, the voltage difference (Va-Vb) at motor coil 170 two ends is being for just, and the voltage difference (Va-Vb) at motor coil 170 two ends can along with the discharging action of motor coil 170 toward zero near.
During less than one second default reference voltage, backward current preventing circuit 190 produces a discharge control signal Discharge at the absolute value of voltage difference (Va-Vb).After motor control circuit 160 receives this discharge control signal Discharge, gate control signal A is switched to electronegative potential with turn-on switch component M1, and gate control signal C is switched to electronegative potential with off switch element M3, to switch to the first conducting phase place.
In the aforementioned embodiment, by switching in the process of interdischarge interval during the first conducting phase place, switch element M1 closes conducting with switch element M3 for carrying out simultaneously.But, produce short circuit for fear of switch element M1 and switch element M3 conducting simultaneously, as shown in Figure 6, with regard to a preferred embodiment, during can inserting a dead band during the first conducting phase place and between the interdischarge interval (dead time).That is before turn-on switch component M3, first off switch element M1.Likewise, produce short circuit for fear of switch element M4 and switch element M2 conducting simultaneously, can insert a dead band between during the interdischarge interval and the second conducting phase place during (dead time).That is before turn-on switch component M2, first off switch element M4.
Secondly, with regard to a preferred embodiment, backward current preventing circuit 190 of the present invention can for one have two default reference voltages comparator.The voltage Va of this comparator detecting motor coil 170 two-end-point VA and VB; Vb; And in the absolute value of voltage difference (Va-Vb) when negative (voltage difference (Va-Vb) for) during less than one first default reference voltage or voltage difference (Va-Vb) (voltage difference (Va-Vb) is correct time) during less than one second default reference voltage; Produce discharge control signal Discharge, notice motor control circuit 160 carries out the commutation action.But, the present invention is not limited to this, and this comparator also can only have a default reference voltage.During less than a default reference voltage, promptly produce discharge control signal at the absolute value of voltage difference (Va-Vb) (no matter voltage difference (Va-Vb) for just or for negative).
The present invention mainly proposes a kind of motor drive and the locking protection and the readiness control circuit that are used for this motor drive, locks the operation of protecting with standby mode to coordinate motor, and gets into automatically in due course or the disengaging standby mode.
But the above; Be merely preferred embodiment of the present invention, do not limit protection scope of the present invention with this, promptly all simple equivalent of doing according to claim of the present invention and description change and revise; All still belong in the scope that claim of the present invention contains explanation hereby.
Claims (15)
1. a motor drive to control the rotation of a motor, is characterized in that, this motor drive comprises:
One locking protected location is according to a motor rotation signal, to produce a locking signal;
One standby mode judging unit; Receive a pulse width modulation signal and this locking signal; And produce a standby mode control signal according to this pulse width modulation signal and this locking signal, and this locking protected location is according to this standby mode control signal, and whether decision stops this locking signal; And
One motor control circuit is according to the rotation of this pulse width modulation signal and this motor of this standby mode control signal control.
2. motor drive as claimed in claim 1 is characterized in that, this locking protected location detects this motor and stops operating above after one first scheduled time length, produces this locking signal.
3. motor drive as claimed in claim 1 is characterized in that whether this motor control circuit switches to a standby mode according to this standby mode control signal decision.
4. motor drive as claimed in claim 3 is characterized in that, when this standby mode control signal is during corresponding to a standby mode, this locking protected location stops to produce this locking signal.
5. motor drive as claimed in claim 4; It is characterized in that; When this pulse width modulation signal is to stop driving condition corresponding to one, after this standby mode judging unit receives this locking signal, produce this standby mode control signal corresponding to this standby mode.
6. motor drive as claimed in claim 5; It is characterized in that; When this pulse width modulation signal is to stop driving condition by this to return back to a driven state, this standby mode judging unit makes this locking protected location recovery normal operation according to this standby mode control signal that this pulse width modulation signal produces corresponding to a normal mode.
7. motor drive as claimed in claim 1; It is characterized in that; This standby mode judging unit has a logical circuit, produces this standby mode control signal according to this pulse width modulation signal and this locking signal, and this logical circuit comprises a latch circuit or a flip-flop.
8. a locking protection and a readiness control circuit that is used for motor drive is characterized in that, this motor drive is according to a pulse width modulation signal controlling one revolution, and this locking protection comprises with readiness control circuit:
One locking protected location is according to a motor rotation signal, to produce a locking signal; And
One standby mode judging unit; Receive this pulse width modulation signal and this locking signal; And produce a standby mode control signal according to this pulse width modulation signal and this locking signal, and this locking protected location is according to this standby mode control signal, and whether decision stops this locking signal.
9. locking protection as claimed in claim 8 and readiness control circuit is characterized in that, this locking protected location detects this motor and stops operating above after one first scheduled time length, produces this locking signal.
10. locking protection as claimed in claim 8 and readiness control circuit, it is characterized in that when this standby mode control signal be during corresponding to a standby mode, this locking protected location stops to produce this locking signal.
11. locking protection as claimed in claim 10 and readiness control circuit; It is characterized in that; When this pulse width modulation signal is to stop driving condition corresponding to one, after this standby mode judging unit receives this locking signal, produce this standby mode control signal corresponding to this standby mode.
12. locking protection as claimed in claim 11 and readiness control circuit is characterized in that, when this pulse width modulation signal is to stop driving condition corresponding to this, this locking signal of this locking protected location output is a pulse signal.
13. locking protection as claimed in claim 11 and readiness control circuit; It is characterized in that; When this pulse width modulation signal is to stop driving condition by this to return back to a driven state, this standby mode judging unit makes this locking protected location recovery normal operation according to this standby mode control signal that this pulse width modulation signal produces corresponding to a normal mode.
14. locking protection as claimed in claim 9 and readiness control circuit; It is characterized in that; This locking protected location has a locking protection circuit and an oscillator; This locking protection circuit has at least one counter, and calculates this first default time length according to the oscillator signal that this oscillator produced.
15. locking protection as claimed in claim 8 and readiness control circuit; It is characterized in that; This standby mode judging unit has a logical circuit; Produce this standby mode control signal according to this pulse width modulation signal and this locking signal, this logical circuit comprises a latch circuit or a flip-flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110155514.0A CN102820842B (en) | 2011-06-10 | 2011-06-10 | Motor driving device and lockout protection and standby control circuit for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110155514.0A CN102820842B (en) | 2011-06-10 | 2011-06-10 | Motor driving device and lockout protection and standby control circuit for same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102820842A true CN102820842A (en) | 2012-12-12 |
| CN102820842B CN102820842B (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110155514.0A Active CN102820842B (en) | 2011-06-10 | 2011-06-10 | Motor driving device and lockout protection and standby control circuit for same |
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| CN (1) | CN102820842B (en) |
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| CN105846755A (en) * | 2015-01-14 | 2016-08-10 | 南京德朔实业有限公司 | Electric tool and motor control method |
| CN106385249A (en) * | 2016-08-26 | 2017-02-08 | 王文杰 | PWM control signal self-locking protection circuit of electric automobile motor controller |
| CN106580364A (en) * | 2016-11-16 | 2017-04-26 | Tcl医疗放射技术（北京）有限公司 | X-ray machine limiting protection device and method thereof |
| CN110545064A (en) * | 2018-05-28 | 2019-12-06 | 杭州三花研究院有限公司 | Control method and control system |
| CN112803871A (en) * | 2021-04-13 | 2021-05-14 | 深圳市拓尔微电子有限责任公司 | Motor driving circuit and method for controlling the same |
| US20210227720A1 (en) * | 2018-05-28 | 2021-07-22 | Zhejiang Sanhua Intelligent Controls Co., Ltd | Mode Control Method and System, and Electronic Apparatus and Storage Medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105846755A (en) * | 2015-01-14 | 2016-08-10 | 南京德朔实业有限公司 | Electric tool and motor control method |
| CN105846755B (en) * | 2015-01-14 | 2019-04-19 | 南京德朔实业有限公司 | The control method of electric tool and motor |
| CN106385249A (en) * | 2016-08-26 | 2017-02-08 | 王文杰 | PWM control signal self-locking protection circuit of electric automobile motor controller |
| CN106580364A (en) * | 2016-11-16 | 2017-04-26 | Tcl医疗放射技术（北京）有限公司 | X-ray machine limiting protection device and method thereof |
| CN106580364B (en) * | 2016-11-16 | 2020-06-09 | 上海惠影医疗科技有限公司 | X-ray machine limiting protection device and method thereof |
| CN110545064A (en) * | 2018-05-28 | 2019-12-06 | 杭州三花研究院有限公司 | Control method and control system |
| US20210227720A1 (en) * | 2018-05-28 | 2021-07-22 | Zhejiang Sanhua Intelligent Controls Co., Ltd | Mode Control Method and System, and Electronic Apparatus and Storage Medium |
| EP3806321A4 (en) * | 2018-05-28 | 2022-03-23 | Zhejiang Sanhua Intelligent Controls Co., Ltd. | Mode control method and system, and electronic apparatus and storage medium |
| CN110545064B (en) * | 2018-05-28 | 2023-03-07 | 浙江三花智能控制股份有限公司 | Control method and control system |
| CN112803871A (en) * | 2021-04-13 | 2021-05-14 | 深圳市拓尔微电子有限责任公司 | Motor driving circuit and method for controlling the same |
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