TWI247479B - Motor control circuit for supplying a controllable driving voltage - Google Patents

Abstract

For applying a driving voltage to a motor, an H-bridge circuit is constructed by a first and a second linear unit and a first and a second switching unit. An error amplifier generates an error signal representative of a difference between the driving voltage detected by a voltage detecting circuit and a command voltage signal. A state control circuit synchronously controls the first and second switching units and a feedback circuit. Through the feedback circuit, the error signal is selectively applied to the first or second linear unit such that one is operated in a linear mode and the other is operated in a nonconductive mode, thereby controlling the driving voltage to become proportional to the command voltage signal. The state control circuit further controls a brake circuit for transforming the error signal into a brake signal to operate the first and second linear units simultaneously in a conductive mode.

Description

1247479 发明, INSTRUCTION DESCRIPTION: TECHNICAL FIELD OF THE INVENTION The present invention relates to a motor control circuit that can control a driving voltage to a control circuit of a motor. [Prior Art] = In other words, a bridge circuit composed of four switching transistors provides driving dust to the motor, such as a DC motor (DC 〇 =, stepping motor, and vocal ring) The motor (testing 'to control the direction of rotation of the motor, the speed of rotation, and other features. Figure 1 shows a conventional bridge circuit for driving the motor 〇1, road map. 翏照H1 'motor PCT The via circuit W is lightly coupled between the supply L and the ground potential. Although the motor is internally composed of a plurality of (four) systems composed of a singularity of circuit and circuit, the drive power is applied to the motor M. The coil is used to generate a magnetic field. Therefore, the word "motor" mainly refers to the coil of the motor, 1 simplifies the view - an inductive load, and the figure also specifically points the coil to describe the motor Μ. The % bridge circuit 1〇 includes four Ν channel MOSFETs (gold oxide NMOS NM0S) transistors q 〗 〖 to Q4. The NM 〇 s transistor Qi. is not transferred to the supply voltage source Vm, and its source is coupled to End point of motor A A. The drain of transistor Q2 is coupled to the supply voltage source Vm, and its source is transferred to the end of the motor ^ ^. ^ ^ ^ ^ ^ transistor (^ 汲 耦合 coupling, a Ma Jian μ 1247479 end A, and its source is coupled to the ground potential. The drain of the NM〇s transistor is coupled to the terminal B of the motor, and its source is coupled to the ground potential. 4 Since the NMOS transistors (^ to I have parasitic diodes to Ε>4, respectively, the bridge The circuit 1 does not need to additionally provide a flywheel (Flywh^) diode. If the four switch cell systems of the bridge circuit 10 are implemented by a bipolar junction transistor (Bipolar Juncti〇n Trransist〇r, BJT) , the diodes D! to D4 shown in Figure 1 must be additionally set. The gates of the NMOS transistors h to I are controlled by the control signals h to G4, respectively. When the control signals 〇1 and & are at a logic high level And when the control signals G2 and G3 are at a logic low level, the nm〇S transistors Qi and q4 are turned on and the NMOS transistors Q1 and A are not turned on, so that the terminal VIII is coupled to the supply voltage source via the NMOS transistor Q1. And the NMOS transistor Q4 whose terminal b is turned on = is coupled to the ground potential. As a result, the supply voltage source vm applies a driving voltage to the motor. M, so that the drive current flows from the female point A to the end point b through the motor μ. When the control signal & and g are at a logic low level and the control signals A and Gs are at a logic high level, 4 NM0S transistor Q1 And Q4 is non-conducting and the ship S transistor I is conducting, such that the end point B is coupled to the voltage source Vm via the turned-on NMOS transistor h, and the terminal end A. is lighter via the turned-on nm〇S transistor q3: Ground potential. As a result, the supply voltage source Vm applies another drive voltage up to Μ 'to drive the current l2 from the end point b to the end point... motor M. , ,, A direction flows through

In a wide range of applications where motor Μ is used, the drive voltages applied to terminals VIII and B determine the actual operating characteristics of the motor ,, because 247 J, type 1247479 is required to meet several application requirements. First, the polarity and absolute value of the driving voltage must be a controllable physical quantity, because the polarity of the driving voltage determines the direction of the magnetic field generated by the coil of the motor and the absolute value of the driving voltage is determined by the coil of the motor. The strength of the magnetic field. Especially when the motor is operated in a constant voltage drive, the absolute value of the drive voltage must be kept constant. In the know, the pulse width Lu Zhou change (pulse Widtli (10), the technology 用于 $ is used to control the absolute value of the driving voltage applied to the motor, the body is LV, the NMOS transistor Q4 is turned on and the NM 〇s transistor Q2 two In the case where Q3 is not 'passed, the control signal Gi is derived from a target of a pWM signal, so that the on-time of the NM〇s transistor Qi is determined by the control signal & Duty Cycle, thereby controlling the driving power. • The average value of the voltage. However, the 'PWM technology causes the supply voltage source % and the voltage applied to the motor's (4) voltage. The PW technology that is known to require precise control of the motor may have several adverse effects. Therefore, a control circuit capable of providing a low noise driving voltage to the horse itM is desired. SUMMARY OF THE INVENTION The present invention is directed to providing a motor control circuit for controlling the polarity and absolute value of a driving voltage for a motor. Another object of the present invention is to provide a horse far control circuit that can maintain the absolute value of the driving voltage for the motor to be fixed. The motor control circuit can suppress another object of the present invention. It is to provide a noise for driving voltage of a motor. 1247479 According to the present invention, a motor control circuit is provided for supplying a drive voltage to a motor. The drive voltage is applied to the first end of the motor. The motor control circuit includes: - a bridge circuit, a voltage circuit: an error amplifier, a feedback circuit, and a state control bridge circuit having a first and a second linear unit And first and second: off early. The 'linear unit and the first switch unit are coupled together to the first two points. The second linear unit is combined with the first switch & single face to the second end. The circuit generates at least a voltage detection signal representing a motor voltage. The error amplifier generates at least an error signal representing a difference between the voltage detection signal and a command voltage signal. At least one of the error signals is electrically separated from First and second switch _. The feedback circuit is lightly coupled to receive at least an error signal to selectively apply at least a number to the second or second linear unit. The state control circuit synchronizes _1l first and second open Unit and feedback circuit. During the red period, the first switch unit operates in a non-conducting mode. ★ The first unit is in a conduction mode, and the feedback circuit allows at least one of the errors to be applied. To the first linear unit, resulting in the first linear order

= operating in a linear mode, and the feedback circuit prevents at least one error signal from being applied to the second slower S. Thus, the drive voltage is controlled to be substantially proportional to the 〒7 voltage signal. At this time, the driving voltage causes a current to flow through the motor in a direction from the first end point to the second end point.第In the first: operation period, the first switching unit operates in the conduction mode, the first switching unit operates in the non-conduction mode, the feedback circuit prevents at least one error 10 1247479 difference signal is applied to the first linear unit, and the feedback circuit Allowing at least one error "the other one is applied to the linear unit, causing the second linear unit to operate in the linear mode. Thus, the driving voltage is controlled to be substantially proportional to the command voltage signal. At this time, the driving voltage causes a current to The motor flows from the second end to the first end. The voltage detecting circuit includes first and second voltage dividers. The first voltage divider is connected in series between the first end point and the ground potential for rotation The first end dividing signal is used as one of the at least one voltage detecting signal. The second voltage divider is connected in series between the second end point and the ground potential for outputting the second end point dividing signal as at least one The other of the voltage detection signals. The error amplifier includes first to third NMOS transistors and first to third current mirrors. The gate of the first NMOS transistor is controlled by the first terminal voltage division nickname and The pole is coupled to a fixed current source. The gate of the second NM〇s transistor is controlled by the second terminal voltage dividing signal and its source is coupled to the port source. The second N Μ 0 S transistor gate The pole is controlled by the command electric grind signal and its source is coupled to the fixed current source. The original current of the first current mirror is singular to the first NMOS transistor; and the pole is connected to the second nm 电s transistor. The primary current branch of the second current mirror is coupled to the drain of the third NM〇s transistor. The original current branch of the third current mirror is coupled to the mirror current branch of the first current mirror. The first output is coupled to the second The mirror current branch of the current mirror and the mirror current branch of the third current mirror are used to supply at least one of the error signals. The second current mirror further has a parallel mirror current branch coupled in parallel to the mirror current branch of the second current mirror. The third current mirror has a parallel mirror 11 1247479 image electric > 7 丨 L for the branch 'parallel narrator # Chu — shy aunt crying the current mirror mirror current branch. Error amplification port 0 contains a first - Giving the mirror current branch with the second The parallel of the two current mirrors should be at least - error signal I:: parallel mirror current branch for the feedback circuit including the first first step and the first linear unit, the switching device is light and controlled by the state control circuit During the first operation period, the _ _ _ only 4 虞 setting allows at least one of the error signals: a linear 70. During the second operation, the first switching device is coupled to the signal applied to the first linear unit. The second switching device - is a period of time and is controlled by the state control circuit. In the second green 柹1, the second switching means prevents at least one error signal from being applied to, i. In the second operation period, the second switching device allows the application of the other of the ^h~ signals to the second linear unit. The state control circuit Sun n Feng ^ ^ , , step output first to fourth state control signals two Lei: respectively control the feedback circuit of the first and second switching device and Η ^ . ^ ^ 苐 - switching unit. The first to fourth state control signals are low IS one-bit digital logic signals having a logic high level and a logic low level. Α筮一· is in the logic low level ^ 'the first and third shape 1 control signal level - the first and fourth state control signals are at the logic high side ^: ^ during the second operation period 'first and third state The control signal is in the horizontal direction and the fishing knot, and the fourth state control signal is at the logic low level. The > 2 control circuit further includes a brake circuit, and the state control circuit is ^ Lu ^ Yan. During the third operation period, the braking circuit converts at least one error signal: ', to / - braking signal, and simultaneously applies at least 12 1247479 #, ", a signal to the first and second linear unit units via the feedback circuit When the circuit control number signal input number becomes four-state logic high, the operation is turned on.纟¥—and the second linear system first and second open “two-plane period, the state control state control circuit is more: conduction mode. , with a logic high level of gold - a system - digital logic :: car circuit, the brake circuit conversion: to 煞: at least one brake signal. During the third operation period, the ::: system nickname is at the lower level of the waterfall and = level. The following description and the accompanying drawings will make the advantages, features, and advantages of the present invention more obvious. —, ‘处,八八目 The preferred embodiment of the invention. And, FIG. 2 shows a circuit diagram of a motor circuit according to the present invention. Referring to FIG. 2, the 91 φ r motor control circuit 20 of an example of the twin 峪 20 includes a 式 bridge type, a circuit 22, an error amplifier 23, two: 24, and a state control. The circuit is. Port circuit The bridge circuit 2 1 consists of two lines, the switch unit and SQ2. Line Qb, ton and two electric (4) vm and motor M s : _Qb, .LQ2 for the integration of the motor Μ and ground power:: 7 ° early SQl and % are used to couple linear mode, conduction mode: LQI and The operating state package of LQ2 and the operational state of SQ2 include, and the switching mode %~, includes the conduction mode and the non-conduction mode. "Linear 13 1247479: R system / 曰 equivalent resistance value with the control signal substantially linearly variable material ρ, road (four) state. "non-conduction mode" - word means that the resistance is very high and is considered f quality open circuit operation.

The voltage detecting circuit 22 is used for (4) the driving voltage of the motor M, and is also applied to the voltage of the terminal A and the terminal ^ of the motor, and the output of the crying represents the motor driving voltage (four) measuring signal % to error amplification: Inverted wheel end (1). The non-inverting input terminal of the error amplifier 23 receives a command electromigration (c〇mmand v〇hage) signal for indicating that the motor control material 2G not according to the present invention generates a desired motor, the dynamic voltage ° command electric M signal U is returned by the user according to the application, or is returned to the jt error amplifier 23 according to the operating characteristics of the motor by other circuits, and at least one voltage detection signal Vd is compared with the command voltage signal ve()m. At least - an error signal Ve representing the difference between the two is generated.

Based on the state control signal generated by the state control circuit 25 and S2, the feedback circuit 24 selectively applies at least one error signal Ve generated by the error amplifier 23 to the linear unit % or LQ2. Specifically, when the state control signals ~ and S2 indicate the feedback circuit 24: the linear unit [仏 operates in the linear mode and the linear unit LQ2 operates in the non-conduction mode, the feedback circuit 24 allows at least one error signal Ve to be applied to the linear unit Lq 1 but prevents at least one error signal Ve from being applied to the linear unit. In this case, the equivalent resistance value of the linear unit LQ1 varies substantially linearly with at least one error signal Ve. When the state control signal heart and h indicate that the feedback circuit 24·· 14 1247479 operates in the non-conduction mode and the linear unit LQ2 operates in the line=式, the feedback circuit 24 prevents at least the error signal I from being applied to the line lQi but allows at least An error signal Ve is applied to the linear unit - in this case the equivalent resistance value of the linear single A Lq2 varies substantially linearly with at least the error k number Ve. The state control circuit 25 further generates two other state control signals: for controlling the switching unit of the bridge circuit 21 to be called 2, such that: operating in a conduction mode or a non-conduction mode. The state control circuit & the same control signal Si to & cooperate with each other to achieve control according to the operation state of the motor control circuit 20. In other words, when the state control signal & enables the feedback circuit to selectively apply at least - an error occurs. When Ve reaches the linear unit LQi, the state control #5虎S4 causes the switch unit to be called the signal τ¥. At this time, the state control ',, early 70 LQ2 and the switching unit SQi operate in the non-conducting % mode. The society wants, the people, the Λ, the end point of the motor 八 eight through the operation of the linear mode ^ 1 side in the supply of electricity Vm, and the end of the motor Β is short-circuited to the ground. * The potential is essentially zero due to the voltage at the end point. Therefore, if the voltage is Α, it is the motor drive voltage. In this case, the direction of the drive power L to the end point ^ flows through the motor. As described above, the motor lw is changed by the 23, and the feedback circuit 22 constructed by the feedback circuit 24 and the error amplifier _ ^ kg are looped back to the linear unit LQ!, and the linear unit LQi is used. The Lele compacts and controls the motor drive to change the resistance value. The other command the electric house signal V. The W-shaped sad control signal S2 causes the feedback circuit 24 to selectively apply at least one signal 1 to the switch circuit 24 to make the switch When the difference is linear to the unit ton, the state control signal S4 s is eight early and Ql# is in the conduction mode. At this time, the state control is not conducting mode. The L Q1 and the switching unit s Q 2 operate in the linear unit L0. The end point b of the second is coupled to the supply voltage source Vm via the linear mode Q2, and the end $A of the motor M is short-circuited to the heart point of the cell. Since the voltage of the bat point A is substantially zero, "', t pressure This is the motor drive voltage. In this case: the horse (10) flows in the direction from the end point B to the end point A. As before:: The fluctuation of the driving voltage is fed back to the linear single it LQ2 via the circuit formed by the electric (four) measuring circuit 22, the error amplifier 23, and the feedback circuit 24, whereby the equivalent resistance value of the sex unit Lq2 is The control is controlled to be proportional to the command voltage signal. Therefore, the motor control circuit 2 according to the present invention can control the polarity and absolute value of the driving voltage for the motor. If the command voltage signal Vc〇m is set For a fixed value, the motor control circuit according to the present invention can maintain the absolute value of the driving voltage for the motor constant. Since the motor control circuit 20 according to the present invention utilizes the linear mode of the linear units LQi and LQ2 to obtain the desired The motor drives the voltage, so the noise of the driving voltage is effectively suppressed. It should be noted that in the motor control circuit 2 according to the present invention, the switching units SQ! and SQ2 are controlled by the state control circuit 25 to control the signal S3. And S4 control, rather than at least one error signal Ve. In particular, at least one error signal Ve is electrically separated from the switching unit and Sq2. To w, one, ^ an error " Ve mainly linear feedback control membered mono 161247479 LQ via a feedback circuit 24 selectively! Or LQ2, so that it operates in linear mode. In the embodiment shown in Fig. 2, Li, Shousheng, L Q1 > NM〇S transistor were implemented. Lines Vb and LQ2 are coupled by r, early 70 LQi's drain is coupled to the bud source vm, and its source is coupled to the motor's end point A. Linear single pole is coupled to supply voltage source V and Q2

m and its source is lightly coupled to the motor M ‘point Β. Switch unit sQi and SO f mountain \Τ1ν> ΓΑ

Wh, the switch unit S of the NM〇S transistor is connected (the drain of the ^ is coupled to the motor M, δ to the ground potential. The switch unit SQ2 is not lightly coupled to the motor...: B ' and its source is lightly coupled to the ground Potential. ... It should be noted that since the NMOS transistor has a parasitic diode ... to d, the bridge circuit 21 shown in Fig. 2 does not need to additionally provide the flywheel 4, and the linear unit of the bridge circuit 21 is called LQ2 and SQ. ^ SQ2 is implemented by a bipolar junction transistor, and the diodes D! to D4 shown in Fig. 2 must be additionally provided. The voltage detection circuit 22 is composed of two voltage dividers 22 and 222. The knives detect the voltage at the end point A of the motor 与 and the voltage at the end point B. The squeezing state 22 实施 is implemented by a series connection between the end point a and the ground potential. The measured signal Vdl is taken out from the coupling point of the resistance core and h, and the voltage division ratio between the voltage and the voltage at the terminal A is R3/(Ri + R3). The voltage regulator 222 is connected in series to the terminal B and the ground potential. The resistors R2 and ^ are implemented. The voltage detection signal Vu is taken from the coupling point of the resistors h and I. The voltage division ratio between the voltage and the voltage at the terminal B. is r4/(R2 + R4). The core to R4 is designed such that R3/(R1 + R3) is equal to R4/(R2 + R4). In the embodiment shown in Fig. 2, the voltage detection signals Vd1 and Vu constitute the former 17 1247479 The at least one voltage detecting signal Vd is used to represent the motor driving voltage. - It should be noted that although in the embodiment shown in FIG. 2, the voltage detecting circuit 22 rotates two electric (four) measuring (four) Vdi Xiao Vd2, the present invention The second application to the voltage detecting circuit 22 further includes an analog comparator for obtaining the difference between the voltages at the terminal A and the terminal B to generate a single-voltage debt signal vd representing the motor drive. The error amplifier 23 has two inverting input terminals for respectively receiving the voltage detection signals Vdl and Vd2. As described above, when the motor M operates in the driving flow, the end point Α flows to the end point β. When the motor driving voltage is substantially equal to the voltage of the terminal A and the terminal B is short-circuited to the ground potential, the voltage detection signal vdl represents the motor driving voltage and the voltage detecting signal v

It = zero two, the error amplifier 23 Μ only compares the electric (four) measured the difference between the heart and the command voltage signal meaning (four). On the other hand, when the motor is operated to drive the current from the end point 3 to the end point A, the motor drive voltage is substantially equal to the voltage of the end point B and the end point A is short-circuited to the ground potential, so the voltage is her Vd2 represents the motor drive voltage and the pressure measurement "Vdl is substantially zero. As a result, the error amplifier ^ substantially only compares the difference between the voltage detection signal VU and the command voltage signal Ye. The error amplifier 23 has two wheels which are identical to each other to generate the same error signal as each other 'bird as the former; jin: 2 to > an error signal Ve. The wheel terminal 〇1 is coupled to the linear unit LQ ==2 to be combined with the linear unit LQ2. The feedback circuit 24 is provided with two: the OFF-wave SW1 and the SW" switching device SWi are controlled by the shape h. When the switching device SW1 is turned on, the wheel-out terminal 01 is short-circuited = 18 1247479 surface potential, so that the error signal Vel cannot be applied to The linear unit % and the linear unit LQ1 operate in the non-conduction mode. When the switching device is not turned on, the error signal vel is applied to the linear unit to operate in the linear mode. The switching device sw2 is controlled by the state control signal S2. When sw2 is turned on, 'transmission (4) 〇 2 is short-circuited to the ground potential, causing the error signal Ve2 to be applied to the linear single A LQ2 and the linear unit is called to operate in the non-conduction mode. When the switching device SW2 is not conducting, the error signal Ve2 is applied to the linear unit LQ2. Let it operate in linear mode. / It should be noted that although in the embodiment shown in Fig. 2, the feedback circuit 24 is independent of the state control road 25, the error signal Vel is independently determined to be added to the linear early. Where LQi and independently determines whether the error signal L is applied to the linear unit LO, #士& _ Q2 仁 The present invention is not limited thereto and is applied to the error amplifier 23 with only a single wheel + σ ^ round-out, used to generate the early error signal Ve. In this case, the feedback circuit 24 is under the state control circuit, so that the error amplifier ^ ^ 0 a " early output cake selectively Coupling linear early LQ!. or LQ. To perform a single to linear unit ton or lq2.,...optically apply linear == bridge unit 21 linear unit LQl and call system operation, work. The technology is switched in a high-frequency manner by the PWM method, and the M-gate is switched between the two doors. Therefore, the motor control circuit «k according to the present invention disturbs the supply voltage source Vm and effectively chokes the entanglement. The city's horse violates the drive ^V right expects to suppress the motor drive electric sensation to a greater extent. Then the feedback circuit 24 has a capacitance c. It is known that the linear unit Tn 2 冤谷Ci coupling is between the gate and the ground potential. To make the error signal 19 1247479

Vel is applied relatively gently to the linear person's gate of the LQi. Electric pet know

5 in the linear unit LQ2 idle pole and the ground, the difference: ve2 is relatively gently applied to the linear unit kiss _ ❹ W 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据 依据v, and the same as in the conduction mode.罝 Body and Lu, when the motor control circuit 2 〇 uranium / a slave earth, circuit 仃 、, car control, the state control circuit 25 outputs a brake control sound by w 彳.唬BRK to brake circuit 26. Returning to the brake control signal BRK, the brakes are defeated by the gamma, and the soap circuit 26 converts the error-to-parent error signal Ve generated by the error amplifier 23 into virtual $W, ^.T^W to J. Brake signal. Under the control of the bear-bearing circuit 25, the _~工H# switch is called the % operation and the non-conduction type, and the feedback circuit 24 is the same as the 睥^ 一一U plus at least one brake signal to the linear 7G Q4LQ2, the material is operated in the conduction mode. ^ In the embodiment shown in Fig. 2, in response to the brake control number BRK, the brake circuit 26 makes the error and the difference is amplified. The two inverting inputs are known to be short-circuited to the ground potential or false. The field is at a lower level than the command voltage signal vcom. As a result, the error is poorly identified λ, Λτ ” " el /, Ve2 is transformed into logic The high-level brake signal, instead of the summer arrow M m >, Tanjong describes the linear signal used for feedback control. In this case, the state control circuit 25

The electric tower 25 is finely controlled by the control signal & and the L switching devices SWi and SW. III r士 π it β non-conducting.' Makes the brakes with logic high level 4 Lu 5 Tiger V e 1 and V 丨 丨 于 于 于 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 The squid with a high logic level lacks v. Tr dry, ", saponin Vel and Yd make the linear unit lq and LQ2 operate in conduction mode; check the 、, supply to achieve the desired brake control. In the brake control, the rabbit / by i & In order to make the differentials Vel and Ve2 more quickly into a logically high drought ..., the car said that the brake circuit 26 can be equipped with a direct control error amplifier 23 The output stage device forcing the two output terminals 〇1 and 〇2 to rapidly output the brake signal with the logic high level and Ve2 0. Figure 3 shows a detailed circuit diagram of an example of the error amplifier 23 and the brake circuit % according to the present invention. A detailed circuit of an example of the error amplifier 23 according to the present invention is shown. The gate of the NMOS transistor N1 is used to receive the voltage detection signal Vdl, and the gate of the NMOS transistor n2 is used to receive the voltage detection signal Vu, and the NMOS is The gate of the crystal % is used to receive the command voltage signal Vcom. The source of the NMOS transistor to N3 is lightly coupled to a solid current source Iea. When the voltage detection signal Vd2 is zero, the NMOS transistor N2 is not turned on. here In the case, the voltage detection signal vdl and the command electric tk number VC()m determine the current ratio of the fixed current source iea to the NMOS transistors Νι and A. When the voltage measurement signal vd2 is zero, the nm〇S transistor In this case, the voltage detection signal Vd2. and the command voltage ^VQm determine the ratio of the current of the fixed current source Iea to the STMOS transistor and N3. The PMOS transistors ?1 and P3 form a current mirror, The pjy^os electric body Pi is used as the original current branch and the PMOS transistor P3 is used as the mirror electrode. The PMOS transistor Pi is lightly coupled to the NMOS transistor team, so that the current flowing through the PMOS transistor P3 Corresponding to the current flowing through the NMOS transistor N! (or NO for representing the voltage spreading signal Vdl (or Vd2) by the mirror effect. The PMOS transistors P2 and P4 constitute another current mirror, wherein the PMOS transistor P2 As the original current branch and the PMOS transistor P4 as a mirror current branch. The PMOS transistor P2 is coupled to the NMOS transistor 21 1247479 body N3 such that the current flowing through the PMOS transistor P4 corresponds to the flow through the NMOS transistor N3 via the mirror effect. Current to represent the command voltage signal V Ec)m 〇 NMOS transistors N4 and N5 form a current mirror, wherein NMOS transistor N4 acts as a raw current branch and NMOS transistor N5 acts as a mirror current branch. NMOS transistor N4 is coupled to PMOS transistor P3 so that it flows through NMOS The current of the crystal N5 corresponds to the current flowing through the NMOS transistor Ni (or N2) by the mirror effect to represent the voltage detection signal Vd1 (or Vd2). The output terminal h of the error amplifier 23 is coupled to the PMOS transistor P4 and the NMOS transistor N5. When the voltage detection signal Vdl (or Vd2) is smaller than the command voltage signal VCQm, the current flowing through the PMOS transistor P4 is greater than the current of the NMOS transistor N5, causing a differential current to flow out from the output terminal. When the voltage detection signal Vdl (or Vd2) is greater than the command voltage signal VCC)m, the current flowing through the PMOS transistor P4 is smaller than the current of the NMOS transistor N5, causing a differential current to flow into the wheel terminal 〇i. Therefore, the error signal Iel is implemented by this differential current. The PMOS transistor P5 is coupled in parallel to the PMOS transistor P4 as a parallel mirror current branch such that the current flowing through the PMOS transistor P5 also represents the command voltage signal V. ·. The NMOS transistor N6 is coupled in parallel to the NMOS transistor N5 as a parallel mirror current branch such that the current flowing through the NMOS transistor N6 also represents the voltage detection signal Vd1 (or Vd2). The output terminal 02 of the error amplifier 23 is coupled to the PMOS transistor P5 and the NMOS transistor N6. When the voltage detection signal Vdl (or Vd2) is less than the voltage signal vCC)m, the current flowing through the PM〇s transistor is greater than the current of the NMOS transistor N6, resulting in a differential current flowing from the output terminal. When the voltage detection signal Vdl (or yd is greater than the command voltage signal, the current flowing through the PMOS transistor I is less than the NM〇s transistor N6: current, causing a differential current to flow into the output terminal 〇2. Therefore, the error signal 込2 The braking circuit 26 includes an NMOS transistor small and Νδ, the drain of which is coupled to the gates of the NMOS transistors % and Ν2, respectively, and the sources of which are coupled to the ground potential. NMOS transistor % The gates of the Ns are controlled by the brake control signal BRK. When the brake control signal BRK is at the logic high level, the NMOS transistors N? and Ns are turned on, respectively, and the gates of the NM〇s transistors Νι and N2 are short-circuited to the ground potential, respectively. As a result, the error signals 乂^ and Ve generated by the error amplifier 23 are converted into a braking signal having a logic high level. In order to make the error signals Vel and Vd transition more rapidly into a braking signal having a logical return level, the braking circuit 26 Further, an NM〇s transistor N9 is provided, the drain of which is coupled to the gate of the NMOS transistor Ns of the first output stage and the gate of the NMOS transistor of the second stage and whose source is coupled to the ground potential. Gate of transistor A The brake control signal brk is controlled. When the brake control signal BRK is at the logic high level, NM〇s = -V, the day body N9 is turned on, so that the NM〇s transistor ratio and the gate of the team are short-circuited to the ground potential and immediately do not conduct. As a result, the error amplifiers 23, the generated error signals Vel and Vel are rapidly converted into the brakes having the logic high level. For a clearer understanding of the motor control circuit 2 Q according to the present invention, reference will be made to FIG. By way of example, the motor control circuit according to the present invention (23-247479) (the ice current flows from the end point A to the end point 3 through the motor M, the drive operation state = (2) the brake operation state, and (3) the current From the end point B to the end point A, the constant pressure driving operation state of the motor M flows through. As shown in Fig. 4, in the operation period 1, the state control signal, and 3 are logic low level, state control signals, and § 4 The logic high level, sw * "t control 仏虎 BRK is logic low level. Therefore, the switch device off unit SQl is not turned on, the switch device sw_M unit Q2 is white, and the brake circuit 26 is not energized (9) can (4) state The end of M Point B is short-circuited to the ground potential, so its voltage is measured to zero. Error signal... Area; linear error between logic high level 11 and logic low level M v. (4) The unit LQl is operated in linear Mode 2. Bit 2 Γ· is pulled down to ground power H due to the conduction of the switching device SW2; ' : The voltage detection signal V d 1 is maintained to be substantially equal to the command voltage:: ratio Γ:, the end of the motor M The power of point A (4) is held in a substantial system - fixed signal pull D#u Vcom. Thus, when the command voltage signal Vcom is made to you ^ according to the motor control circuit 2 of the present invention, the current flows from the end point A to ... The constant pressure drive operation of the motor M is in the state control signal level during the red period T2, and the brake control device S4 white is the logic low level device SW1 disk ^ is the logic high level. Therefore, the driving circuit 26 causes an erroneous braking signal. The braking signals vel and ve2 having the logical position H make 24 1247479 yuan tons and lq2 enter the conduction mode 1 at the same time. According to the present invention, the control circuit 20 effectively achieves the braking operation state. With a library, the voltage at terminal A and terminal B of motor M is substantially equal to

Vm' therefore voltage detection signals ~ and Vd2 are 3 (l+R3)*Vm and R4/(R2 + R4)*Vm, respectively. During the period of T3, the state control signal and s3 are logic high, the second control signal 82 and % are logic low, and the brake control is logic low. Therefore, the switching device ^ and the switch unit Q 2: the switch, the switch device SW2 and the switch unit SQ2 are not turned on, and the brake circuit 26 is in the ^ ^ state. Since the end of the motor port is short-circuited to the ground potential, the signal is also zero. The error is zero on the 'below' power (four) measurement. The pull w el is due to the conduction of the switching device SW1 and the ancient potential s w surface potential. The error (4) Ve2 is a linear signal, which is in the linear region between the logical parity η and the logic 绐 "a τ position drought L", and the feedback control linearity is 7G LQ2 to operate in the line V % i# ^ ^ ... U mode. Result, voltage detection signal

Vu is maintained to be consistently equal to the voltage of terminal B of the command voltage 维持. "Two", the motor (four), when the command voltage is made to two... Compared to the command motor, the invention of the motor control circuit system - (four) value, according to the point eight flow through the motor Μ constant pressure to achieve the current from the end point B The state of the drive is driven by the pressure. It should be noted that although in the example of Fig. 2, the linear unit LQ!盥LQ2_5 is applied to the supply voltage source ν /, SQ2 to the motor Μ and the ground potential 2 and the switch is early - It is applied to the linear unit LQ1MQ^', but the invention is not limited thereto, and Q2 is coupled between the motor Μ and the ground potential and the 25 1247479 switch single tg SQi and SQ2 _ are combined between the supply voltage source % and the motor μ. In this case, 'the conduction of the switching units SQi and Sq2 respectively determines whether the motor Μ knows the point Β疋 and Β疋 whether it is short-circuited to the supply voltage source ～ and the linear unit 叫 and LQ 』 respectively provides the equivalent 纟 resistance value of the feedback control to the motor Between the endpoints A and B and the ground potential. Various modifications and similar arrangements. μ . ^ The scope of this patent application should be based on the broadest interpretation of all such modifications and similar configurations. The present invention has been described by way of illustration of preferred embodiments. It is understood that the invention is not limited to the disclosed embodiments. On the contrary, the present invention is intended to cover a person skilled in the art. [Simplified illustration of the drawings] Fig. 1 is a circuit diagram of a bridge circuit for brewing a private motor. Fig. 2 is a circuit diagram showing an example of a motor control circuit according to the present invention. Fig. 3 is a view showing a fine circuit diagram of the & differential amplification state and the brake circuit of the port 73 according to the present invention. Figure 4 shows the three operation modes of the motor control circuit according to the timing diagram of the present invention! Symbol description of the components: 1 〇 Η Η bridge circuit 2 〇 motor control circuit 26 1247479 21 H bridge circuit 22 voltage detection circuit 2219 222 partial pressure 23 Error amplifier 24 Feedback circuit 25 State control circuit 26 Vehicle circuit A, B Motor terminal BRK Brake control signal Ci? c2 Capacitance D! ~ D 4 Diode 〇! ~ g4 Conventional control signal Ii, 12 drive Current lea Fixed current source LQi? LQ2 Linear unit M Horse side N! ~Ν 9 NMOS transistor 〇1, 〇2 Output terminal Pi~Ρ5 PMOS transistor Qi~q4 NMOS transistor Ri~R4 Resistance Si~S 4 State control Signal SQi? SQ2 Switch unit swl5 sw: 1 Switching device 1247479 h~τ3 During operation vcom command voltage signal vd, vdl, vd2 voltage detection signal

Vea fixed voltage source ve, vel, ve2 error signal vm supply voltage source

28

Claims (1)

1247479 Pickup, patent application scope: 1 · A motor control circuit for a driving voltage to - motor, the number has a first end point and a first - _ ^ Le 鳊 point the driving voltage is applied to the "di Between the end point and the second end point, the motor control circuit comprises: - a bridge type circuit having - a - linear unit, a second linear unit, a first switching unit, and a one-and-one brother Switching early, the first linear unit is coupled with the first switching unit to w Λ — the brown mouth to the one end of the brother and the second line The second switching unit is coupled to the second terminal; a voltage detecting circuit is configured to generate at least one φ generating main voltage detecting signal, which represents the driving voltage of the motor; An error amplifier for generating at least one Henggan L Shi Shi Wang Shao W difference, which represents a difference between the voltage detection signal and a command voltage signal, wherein the at least-error signal is electrically separated And the feedback circuit is coupled to the error amplifier to receive the at least one error signal to selectively apply the at least one error signal to the first or second linearity Unit; a first state control circuit for synchronously controlling the first and second switching units and the feedback circuit, such that in a first operation period, the first, off unit operates in a non-conduction mode, the second The switching unit (4) is in a conducting mode, the feedback circuit allowing one of the at least one error signal to be applied to the first linear unit, causing the first linear unit to operate in a linear mode, and the feedback circuit prevents the at least An error signal is applied to the second linear unit, whereby the drive voltage is controlled to be substantially proportional to the command voltage signal. 29 1247479 2 - The motor control circuit of claim 2, wherein: the first phase of the motor flows through the first end of the motor to the second end point: the driving voltage is such that the current is from 3. The motor control circuit of the first and second linear items of the patent application, wherein: the unit is further coupled to a supply voltage source, and the first and the first switch unit are further coupled to a ground potential 4 · For example, in the motor control circuit of claim 1 ', the voltage detection circuit includes a voltage detection circuit for outputting two of the first-end and the ground potential measurement signals. No. as the at least one second terminal and the ground potential-second voltage divider, the serial point voltage dividing signal is used as the at least one voltage detector to output another one of the first measured signals. The motor control circuit of claim 4, wherein: the error amplifier comprises: - a source-first NM 〇S transistor, having a closed-pole, - immersed, Pan Wei light person / gate system The first end point partial pressure Controlled by a source and coupled to a fixed current source; 30 1247479 a second NMOS transistor having a gate, a drain, and a source, the gate being terminated by the second terminal a voltage dividing signal is controlled and the source is coupled to the fixed current source; a third NMOS transistor having a gate, a gate, and a source, the gate being controlled by the command voltage signal and The source is coupled to the fixed current source; a first current mirror having an original current branch and a mirror current branch coupled to the drain of the first NMQS transistor and the second NMOS a second current mirror having a raw current branch and a mirror current branch, the original current branch being coupled to the drain of the third NMOS transistor; a third current mirror having An original current branch and a mirror current branch coupled to the mirror current branch of the first current mirror; and a first output coupled to the mirror current branch of the second current mirror Three current The mirror current branch of the mirror is used to supply the one of the at least one error signal. 6. The motor control circuit of claim 5, wherein: the first current branch of the current mirror is implemented by a first PMOS transistor having a gate and a gate a drain and a source, the gate is coupled to the drain, the drain is coupled to the drain of the first NMOS transistor and the gate of the second NMOS transistor 31 1247479 The source is coupled to a fixed voltage source; the original current branch of the second current mirror is implemented by a second PMOS transistor having a gate, a drain, and a source The gate is coupled to the drain, the drain is coupled to the drain of the third NMOS transistor, and the source is coupled to the fixed voltage source; the mirror current branch of the first current mirror Passing through a third PMOS transistor, the third PMOS transistor has a gate, a gate, and a source, and the gate is coupled to the original current branch of the first current mirror. a gate, the drain is coupled to the original current branch of the third current mirror And the source is coupled to the fixed voltage source; and the mirror current branch of the second current mirror is implemented by a fourth PMOS transistor having a gate and a drain. And a gate coupled to the gate of the original current branch of the second current mirror, the gate is coupled to the first output of the error amplifier, and the source is coupled to the gate Fixed voltage source. 7. The motor control circuit of claim 5, wherein: the original current branch of the third current mirror is implemented by a fourth NMOS transistor having a gate and a 汲a pole, a source, the gate is coupled to the gate, the gate current is coupled to the mirror current branch of the first current mirror, and the source is coupled to a ground potential, and the gate The mirror current branch of the three current mirror is implemented by a fifth NMOS 32 1247479 transistor. The fifth NMQS I crystal has a gate, a drain, and a source, and the gate is coupled to the fourth The gate of the NM〇s transistor is coupled to the mirror current branch of the second current mirror, and the source is coupled to the ground potential. 8. The motor control circuit of claim i, wherein: the feedback circuit comprises: a first switching device coupled to the first linear unit and controlled by the state control circuit for The first operation period allows the one of the at least one error signal to be applied to the first linear unit, and a second switching device coupled to the second linear unit and controlled by the state control circuit for The at least one error signal is prevented from being applied to the second linear unit during the first operation. 9. If you apply for a patent range 帛! a motor control circuit, wherein: the feedback circuit comprises: - a 帛-capacitor coupled to the first linear unit for causing the at least one of the at least - error signals to be relative during the first operation period Apply to the first linear unit gently. 10. The motor control circuit of claim i, wherein: the state control circuit synchronously outputs the first to fourth state control codes for respectively controlling the first and second of the feedback circuit a switch device; and the first and the second unit of the bridge circuit, wherein each of the 33 1247479 to the fourth state control signal has a logic high level and a logic low level, and the digital logic signal, At the logic low level during the first operation period and the first logic high level. The third state control signal 2 and the fourth state control signal are at η. As claimed in the patent scope! The motor control circuit of the item, in the basin: the:: state circuit controls the first-and the second switch more synchronously:: in a second operation period, the first-on-two disease is made in the material pass mode The feedback circuit prevents the at least-error from being applied to the first linear early 兀, and the feedback circuit allows the other of the at least one error signal to be applied to the second linear unit, Causing the second linear unit to operate in the linear mode to thereby control the driving voltage to be proportional to the command voltage signal. 12. The motor control circuit of claim n, wherein: during the second operation The driving voltage causes a current to flow through the motor in a direction from the second end to the first end point. 13. The motor control circuit of claim 11, wherein: the second current mirror is further Having a parallel mirror current branch coupled in parallel to the mirror current branch of the second current mirror; the third current mirror further having a parallel mirror current branch coupled in parallel with the first current mirror 34 1247479 And the error amplifier further includes a second output end coupled to the parallel mirror current branch of the second current mirror and the parallel mirror current branch of the third current mirror to supply the at least one error signal The other is the motor control circuit of claim 11 , wherein the feedback circuit comprises: a first switching device coupled to the first linear unit, and the state control circuit is Controlling to allow the one of the at least one error signal to be applied to the first linear unit during the first operation period, and preventing the at least one error signal, a linear unit during the second operation period, and The younger brother, X is not hail, and is controlled by the state control circuit for applying the at least one error signal to the second linear unit during the first operation period, and allowing the younger brother during the operation period. The second linear unit, the other of the difference u is applied to. 15. The motor control circuit of claim 5, wherein the feedback circuit comprises: Applying the one of the at least one error signal to the first linear unit during the first operation of the first linear unit during the first operation of the first and second capacitors, and a second capacitor coupled to the second linear unit 35 1247479 during the second operation period to cause the at least one to be slowly applied to the second linear unit. The other relative of the error signal and 16. The scope of claim 11 a motor control circuit 'in the basin. The state control circuit synchronously outputs the first to fourth state control signals: and controls the first of the feedback circuit and the first of the second switching device and the bridge circuit The second switch unit, wherein the one to the fourth shape is different from the first one, the control unit is a digital logic signal, and has a logic high level and a logic low level, so that: In the (four) period, the 'the first-lower level with the third state control signal and the second and the fourth state control signal are at the logic south level, and during the operation period, the first and the third state Ϊ́ two quasi control signal and the second control signal is the fourth state of the logic low level. For example, the motor control circuit of claim 1 of the patent scope further includes: a 'one brake circuit, which is controlled by the state control circuit, so that the brake circuit converts the at least one in one, one: The error signal becomes to = a ',, a vehicle signal, and the at least one signal is simultaneously applied to the first and the second linear unit via the feedback circuit, causing the first and second linear units to operate simultaneously The conduction mode, and 1 during the third operation period, the state control circuit controls the second switch unit to operate in the non-conduction mode. /, 36 1247479 18. The motor control circuit of claim 17, wherein: the error amplifier has a right 5/b to an inverting input for receiving the at least-voltage debt signal respectively a non-inverting input terminal for receiving the command voltage signal, and during the third operation period, the braking circuit short-circuits the second and the phase inputs of the error amplifier to the ground potential, such that the at least one The error signal is converted into the at least one vehicle fee. 19. The motor control circuit of claim 18, wherein: the error amplifier f has at least one error signal, and the output terminal is configured to respectively output the φ at the third operation period. Xunyi: The spine trailer circuit makes this error amplifier at least the brake signal. Converting the at least-error signal to 20. For example, the motor control circuit of claim 17 of the patent scope, wherein: the evil control circuit is a wheel and a brake control signal, and the fourth _4 g control signal is different Controlling the feedback circuit of the ^^(four) four-state control signal for the first portion of the fractional circuit; and the second switching device and the bridge into the braking circuit, the enabling and closing unit, the braking control signal The system converts the at least-error signal into the at least-error signal and the brake control signal for each H-the fourth state control signal is a digital logic signal having a 37 1247479 The high level and the low level of logic make: in the period of ^Γ &, the first - and the third state control signal have a low logic level, 兮 - logic words you, 隹 _ dx brother - and the fourth The state control signal is at the 冋, '2 and the brake control signal is at the logic low level, and during the third operation period, the first to the fourth state control signals are at the logic low level and the 煞The control signal is at a logic high level. 38