CN219760883U - Motor drive device and electric power steering system - Google Patents

Motor drive device and electric power steering system Download PDF

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Publication number
CN219760883U
CN219760883U CN202320983577.3U CN202320983577U CN219760883U CN 219760883 U CN219760883 U CN 219760883U CN 202320983577 U CN202320983577 U CN 202320983577U CN 219760883 U CN219760883 U CN 219760883U
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power supply
motor
control loop
phase
drive
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李茂隆
周勇
张红娟
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Zeifu Automotive Technology Shanghai Co ltd
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Zeifu Automotive Technology Shanghai Co ltd
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Abstract

The utility model relates to the technical field of motors, and provides a motor driving device and an electric power steering system. The motor driving device includes: the transformer comprises a primary coil and at least one secondary coil; the drive control loop comprises a first optical coupler module connected with the drive signal input end, an operational amplifier connected with the first optical coupler module, a second optical coupler module connected with the operational amplifier and a drive signal output end connected with the second optical coupler module, and the drive signal output end and the primary coil are connected in series with the drive power supply end; and at least one phase of power supply control loop, wherein each phase of power supply control loop comprises a field effect tube, a source electrode and a drain electrode of the field effect tube are connected between a corresponding phase winding of the motor and a winding power supply end, and a grid electrode and a source electrode of the field effect tube are respectively connected with two ends of a corresponding secondary side coil. The utility model utilizes the isolation characteristic of the transformer to realize the complete isolation of the drive control loop and the power supply control loop, avoids the crosstalk between the drive control loop and the power supply control loop, and further realizes the stable and reliable drive control of the motor.

Description

Motor drive device and electric power steering system
Technical Field
The utility model relates to the technical field of motors, in particular to a motor driving device and an electric power steering system.
Background
Motors, particularly three-phase motors in systems such as electric power steering, require isolated driving. At present, an isolator chip or a solid state relay is generally adopted to realize isolation, and the following problems exist:
the drive control loop and the power supply control loop of the motor designed based on the isolator chip are partially and commonly connected, so that complete isolation cannot be realized, and an interference signal generated by the power supply control loop easily enters the drive control loop through a ground wire when the motor runs, so that the accuracy of the drive control signal is affected;
the solid state relay has higher cost and overlarge common volume, so that the circuit layout difficulty is high and the electromagnetic interference risk among components is high.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the utility model and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present utility model provides a motor driving device and an electric power steering system, which utilize the isolation characteristic of a transformer to realize complete isolation of a driving control loop and a power supply control loop of a motor, and avoid crosstalk between the two, so as to realize stable and reliable driving control of the motor.
One aspect of the present utility model provides a motor driving apparatus including: the transformer comprises a primary coil and at least one secondary coil; the drive control loop comprises a first optical coupler module connected with a drive signal input end, an operational amplifier connected with the first optical coupler module, a second optical coupler module connected with the operational amplifier and a drive signal output end connected with the second optical coupler module, and the drive signal output end and the primary coil are connected in series with a drive power supply end; and the grid electrode and the source electrode of the field effect tube are respectively connected with two ends of the corresponding secondary side coil.
According to the motor driving device, the isolation characteristic of the transformer is utilized to realize complete isolation of the driving control loop and the power supply control loop of the motor, so that crosstalk between the driving control loop and the power supply control loop is avoided, interference signals of the power supply control loop can not influence driving signals of the driving control loop when the motor normally operates, and protection triggering signals can be output through the driving control loop under abnormal working conditions to control the power supply control loop to realize power-off protection of the motor; the driving control loop can output accurate driving signals based on control signals through the two-stage optocoupler module and the operational amplifier; thus, the motor driving device realizes stable and reliable driving control of the motor;
in addition, the motor driving device adopts common electronic elements with proper volume, and can realize low-cost and simple and compact circuit layout.
In some embodiments, the first optocoupler module comprises: the control end of the first variable resistor is connected with the driving signal input end; the first photosensitive element and the first light emitting element are packaged in a first optocoupler chip, and two input ends of the operational amplifier are respectively connected with two output ends of the first photosensitive element.
The resistance value of the first variable resistor changes along with the change of the driving signal, the luminous brightness of the first light-emitting element connected in series with the first variable resistor changes along with the change of the resistance value of the first variable resistor, and the electric signal flowing through the first photosensitive element is adjusted along with the change of the luminous brightness of the first light-emitting element, so that the operational amplifier sensitively captures the change of the driving signal.
In some embodiments, the motor driving device further includes a first protection resistor connected between the driving signal input terminal and a control terminal of the first variable resistor.
The first variable resistor is subjected to current limiting protection through the first protection resistor.
In some embodiments, the drive control loop further comprises: and the AND gate chip is provided with at least two control signal input ends, and the output end of the AND gate chip is connected with the driving signal input end.
The AND gate chip is used for accurately outputting driving signals according to a plurality of control signals through at least two control signal input ends, and driving control accuracy is improved.
In some embodiments, the second optocoupler module comprises: the control end of the second variable resistor is connected with the output end of the operational amplifier; the driving signal output end is connected with a series node of the second photosensitive element and the second protection resistor.
The resistance value of the second variable resistor changes along with the change of the electric signal output by the operational amplifier, the luminous brightness of the second light-emitting element connected in series with the second variable resistor changes along with the change of the resistance value of the second variable resistor, and the electric signal flowing through the serial connection node of the second photosensitive element and the second protection resistor is adjusted along with the change of the luminous brightness of the second light-emitting element, so that the driving signal output end receives the electric signal which is transmitted by the two-stage optocoupler module and the operational amplifier and accurately represents the change of the driving signal.
In some embodiments, the motor drive apparatus further comprises: a third protection resistor connected between the second light emitting element and the second variable resistor; and/or a pull-up resistor connected between the driving power supply end and the output end of the operational amplifier.
The third protection resistor plays a role in current limiting protection on the second light-emitting element; the output of the operational amplifier is stabilized by the pull-up resistor, and oscillation is avoided.
In some embodiments, the drive control loop further comprises: the control end of the third variable resistor is connected with the output end of the second optocoupler module, and the driving signal output end is led out from a serial node of the third light-emitting element and the third variable resistor.
The resistance value of the third variable resistor changes along with the change of the electric signal of the output end of the second optocoupler module (namely, the serial connection node of the second photosensitive element and the second protection resistor), the third light-emitting element can be used as a driving signal indicator lamp which is lightened/extinguished along with the change of the resistance value of the third variable resistor so as to indicate the working condition states corresponding to different driving signals, and the driving signal output end outputs corresponding driving signals.
In some embodiments, the motor drive apparatus further comprises: the fourth protection resistor is connected between the driving power supply end and the third light-emitting element; and/or a fifth protection resistor is connected between the output end of the second optocoupler module and the control end of the third variable resistor; and/or a pull-down resistor connected between the control terminal of the third variable resistor and the ground terminal.
The fourth protection resistor plays a role in current limiting protection on the third light-emitting element; the fifth protection resistor plays a role in current limiting protection on the third variable resistor; and through the pull-down resistor, the third variable resistor is kept to be cut off when the output end of the second optical coupler module has no high level, so that the driving signal output end outputs a driving signal with high level.
In some embodiments, the power control loop for each phase further comprises: the capacitor element is connected in parallel with two ends of the secondary side coil, and the positive electrode end and the negative electrode end of the secondary side coil are respectively connected with the grid electrode and the source electrode of the field effect tube through a positive electrode output node and a negative electrode output node; and the inductance element is connected in series between the positive electrode end of the capacitance element and the positive electrode output node.
The pulse signal from the secondary coil is shaped and freewheeled into a direct current signal through the capacitive element and the inductive element so as to drive the field effect transistor to work.
In some embodiments, the power control loop for each phase further comprises: a conduction diode connected in series between the positive electrode end of the secondary coil and the positive electrode end of the capacitive element; and/or a load resistor connected in parallel between the positive output node and the negative output node; and/or a zener diode antiparallel between the positive output node and the negative output node; and/or, a freewheeling diode is antiparallel between the drain electrode and the source electrode of the field effect transistor.
The conducting diode ensures the forward conduction of the secondary coil; the load resistor is used as a dummy load of the secondary coil, so that the stability of the driving voltage of the field effect transistor is ensured; the zener diode is used as a voltage limiting protection diode of the field effect transistor; the freewheeling diode realizes freewheeling protection for the field effect transistor.
In some embodiments, the motor is a three-phase motor, and the power supply control loop includes a U-phase power supply control loop connected to a U-phase winding of the three-phase motor, a V-phase power supply control loop connected to a V-phase winding of the three-phase motor, and a W-phase power supply control loop connected to a W-phase winding of the three-phase motor.
In this way, the motor drive device is used to control the drive of the three-phase motor in the electric power steering system.
A further aspect of the utility model provides an electric power steering system in which a power assist motor is provided with the motor drive apparatus described above.
The electric power steering system can realize stable and reliable driving control of the power motor through the motor driving device, so that the interference signal of the power supply control loop can not influence the driving signal of the driving control loop when the power motor normally operates, and the power-off protection of the power motor can be realized through the driving control loop to output a protection triggering signal and control the power supply control loop under abnormal working conditions.
Compared with the prior art, the utility model has the beneficial effects that at least:
according to the motor driving device, the isolation characteristic of the transformer is utilized to realize complete isolation of the driving control loop and the power supply control loop of the motor, so that crosstalk between the driving control loop and the power supply control loop is avoided, interference signals of the power supply control loop can not influence driving signals of the driving control loop when the motor normally operates, and protection triggering signals can be output through the driving control loop under abnormal working conditions to control the power supply control loop to realize power-off protection of the motor; the driving control loop can output accurate driving signals based on control signals through the two-stage optocoupler module and the operational amplifier; thus, the motor driving device realizes stable and reliable driving control of the motor;
in addition, the motor driving device adopts common electronic elements with proper volume, and can realize low-cost and simple and compact circuit layout.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 shows a schematic block diagram of a motor drive apparatus in an embodiment of the utility model;
FIG. 2 is a schematic diagram of the electrical principle of a two-stage optocoupler module and an operational amplifier of a drive control loop according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of the electrical principle of an AND gate chip of a drive control loop in an embodiment of the utility model;
FIG. 4 is a schematic diagram of the electrical principle of a driving signal indicator lamp of a driving control circuit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of the electrical principle of a transformer and a power supply control loop in an embodiment of the utility model;
fig. 6 to 8 are schematic electrical schematic diagrams of field effect transistors of a power supply control loop according to an embodiment of the present utility model;
fig. 9 is a schematic diagram showing voltage signals at signal terminals of a motor driving device according to an embodiment of the present utility model.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
The use of the terms "first," "second," and the like in the description herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
It should be noted that, without conflict, the embodiments of the present utility model and features in different embodiments may be combined with each other.
Fig. 1 shows the main modules of a motor driving apparatus in an embodiment of the present utility model; referring to fig. 1, a motor driving device according to an embodiment of the present utility model includes:
a transformer 10 comprising a primary winding 11 and at least one secondary winding 12;
the driving control loop 20 comprises a first optocoupler module 21 connected with a driving signal input end S1, an operational amplifier 22 connected with the first optocoupler module 21, a second optocoupler module 23 connected with the operational amplifier 22 and a driving signal output end S2 connected with the second optocoupler module 23, wherein the driving signal output end S2 and the primary coil 11 are connected in series with a driving power supply end VCC;
at least one phase of power supply control loop 30, each phase of power supply control loop 30 comprises a field effect tube 33, and a source S and a drain D of the field effect tube 33 are connected with a corresponding phase winding 40 and a winding power supply end V of the motor PHASE The gate G and the source S of the fet 33 are connected to the two ends of the corresponding secondary coil 12, respectively.
In the motor driving device, the isolation characteristic of the transformer 10 is utilized to realize complete isolation of the driving control loop 20 and the power supply control loop 30 of the motor, so that crosstalk between the driving control loop 20 and the power supply control loop 30 is avoided, interference signals of the power supply control loop 30 can not influence driving signals of the driving control loop 20 when the motor normally operates, and protection triggering signals can be output through the driving control loop 20 under abnormal working conditions to control the power supply control loop 30 to realize power-off protection of the motor; the driving control loop 20 can output accurate driving signals based on control signals through the two-stage optocoupler module and the operational amplifier 22; thus, the motor driving device realizes stable and reliable driving control of the motor;
in addition, the motor driving device adopts common electronic elements with proper volume, and can realize low-cost and simple and compact circuit layout.
FIG. 2 illustrates the electrical principle of a two-stage optocoupler module and an operational amplifier driving a control loop in an embodiment of the utility model; as shown in conjunction with fig. 1 and 2, in some embodiments, the first optocoupler module 21 includes:
a first light emitting element 21a and a first variable resistor Q1 connected in series between the driving power supply terminal VCC and the ground terminal, a control terminal of the first variable resistor Q1 being connected to the driving signal input terminal S1;
the first photosensitive element 21b and the first light emitting element 21a are packaged in the first optocoupler chip 21c, and two input ends of the operational amplifier 22 are respectively connected to two output ends of the first photosensitive element 21 b.
The voltage provided by the drive supply terminal VCC is, for example, 5V, or other suitable voltage value. The first light emitting element 21a may be a light emitting diode, or other suitable light emitting element. The first variable resistor Q1 may be a transistor, or other suitable variable resistor device. The first photosensitive element 21b may be a photodiode, or other suitable photosensitive element.
The resistance value of the first variable resistor Q1 changes with the change of the driving signal, the light emission luminance of the first light emitting element 21a connected in series with the first variable resistor Q1 changes with the change of the resistance value of the first variable resistor Q1, and the electric signal flowing through the first photosensitive element 21b is adjusted with the change of the light emission luminance of the first light emitting element 21a, so that the operational amplifier 22 sensitively captures the change of the driving signal.
Further, as shown in fig. 2, in some embodiments, the motor driving apparatus further includes a first protection resistor R1 connected between the driving signal input terminal S1 and the control terminal of the first variable resistor Q1.
The first variable resistor Q1 is subjected to current limiting protection by the first protection resistor R1.
FIG. 3 shows the electrical principle of an AND gate chip driving a control loop in an embodiment of the utility model; as shown in connection with fig. 1-3, in some embodiments, the drive control circuit 20 further includes:
and gate chip 200, and gate chip 200 has at least two control signal inputs (first control signal input IN1 and second control signal input IN2 are shown IN fig. 3), and an output of and gate chip 200 is connected to drive signal input S1.
The first control signal input terminal IN1 and the second control signal input terminal IN2 may be connected to a controller of the motor to receive the control signal. The control signal input terminal of the and gate chip 200 is not limited to two, and may include three or more. The and gate chip 200 can precisely output a driving signal according to a plurality of control signals through at least two control signal input ends, thereby improving driving control accuracy.
As further shown in connection with fig. 1 and 2, in some embodiments, the second optocoupler module 23 includes:
a second light emitting element 23a and a second variable resistor Q2 connected in series between the driving power supply terminal VCC and the ground terminal, the control terminal of the second variable resistor Q2 being connected to the output terminal of the operational amplifier 22;
the second photosensitive element 23b and the second protection resistor R2 are connected in series between the driving power supply end VCC and the ground end, the second photosensitive element 23b and the second light emitting element 23a are packaged in the second optocoupler chip 23c, and the driving signal output end S2 is connected with the series node N1 of the second photosensitive element 23b and the second protection resistor R2.
The second light emitting element 23a may be a light emitting diode, or other suitable light emitting element. The second variable resistor Q2 may be a triode, or other suitable variable resistor device. The second photosensor 23b may be a phototransistor or other suitable photosensor.
The resistance value of the second variable resistor Q2 changes with the change of the electric signal output by the operational amplifier 22, the light emitting brightness of the second light emitting element 23a connected in series with the second variable resistor Q2 changes with the change of the resistance value of the second variable resistor Q2, and the electric signal flowing through the series node N1 of the second photosensitive element 23b and the second protection resistor R2 is adjusted with the change of the light emitting brightness of the second light emitting element 23a, so that the driving signal output terminal S2 receives the electric signal which is transmitted through the two-stage optocoupler module and the operational amplifier 22 and accurately represents the change of the driving signal.
Further, referring to fig. 2, in some embodiments, the motor driving apparatus further includes:
a third protection resistor R3 connected between the second light emitting element 23a and the second variable resistor Q2;
the pull-up resistor R4 is connected between the driving power supply terminal VCC and the output terminal of the operational amplifier 22.
The second light-emitting element 23a is subjected to current limiting protection through the third protection resistor R3; the output of the operational amplifier 22 is stabilized by the pull-up resistor R4, and oscillation is avoided.
FIG. 4 illustrates the electrical principle of a drive signal indicator light driving a control loop in an embodiment of the present utility model; as shown in connection with fig. 1-4, in some embodiments, the drive control circuit 20 further includes:
the control end of the third variable resistor Q3 is connected with the output end of the second optocoupler module 23 (namely, the serial node N1 of the second photosensitive element 23b and the second protection resistor R2), and the serial node of the third light emitting element LED and the third variable resistor Q3 leads out a driving signal output end S2.
The third light emitting element LED may be a light emitting diode or other suitable light emitting element. The third variable resistor Q3 may be a triode, or other suitable variable resistor device.
The resistance value of the third variable resistor Q3 changes along with the change of the electrical signal at the output end of the second optocoupler module 23, and the third light emitting element LED can be used as a driving signal indicator lamp, which is turned on/off along with the change of the resistance value of the third variable resistor Q3 to indicate the working condition states corresponding to different driving signals, and the driving signal output end S2 outputs corresponding driving signals accordingly.
Further, as further shown with continued reference to fig. 2 and 4, in some embodiments, the motor drive apparatus further includes:
the fourth protection resistor R5 is connected between the driving power supply end VCC and the third light-emitting element LED;
the fifth protection resistor R6 is connected between the output end (i.e. the series node N1) of the second optocoupler module 23 and the control end of the third variable resistor Q3;
the pull-down resistor R7 is connected between the control terminal of the third variable resistor Q3 and the ground terminal.
The fourth protection resistor R5 plays a role in current limiting protection on the third light-emitting element LED; the fifth protection resistor R6 plays a role in current limiting protection on the third variable resistor Q3; the third variable resistor Q3 is kept off when the series node N1 is not at a high level by the pull-down resistor R7, and the driving signal output terminal S2 outputs a driving signal at a high level.
Fig. 5 shows the electrical principle of the transformer and the power supply control circuit in the embodiment of the present utility model, and fig. 6 to 8 show the electrical principle of the field effect transistor of the power supply control circuit in the embodiment of the present utility model; the signal transmitted by the drive control loop 20 is isolated through the transformer 10 and the power supply control loop 30, and then the field effect transistor of the motor winding is driven to work, so that the conduction and the closing of the field effect transistor are realized.
In the embodiment shown in fig. 5 to 8, the motor is a three-phase motor, and the power supply control circuit includes a U-phase power supply control circuit 30a connected to a U-phase winding of the three-phase motor, a V-phase power supply control circuit 30b connected to a V-phase winding of the three-phase motor, and a W-phase power supply control circuit 30c connected to a W-phase winding of the three-phase motor. In other embodiments, the motor drive may also be used to effect drive control of a single phase motor, a two phase motor, or other multi-phase motor.
As shown in connection with fig. 1-8, in some embodiments, the U-phase power control loop 30a includes:
a first capacitor element C1 connected in parallel to both ends of the first secondary coil 12a, the positive and negative ends of the first secondary coil 12a passing through the first positive output node U 11 And a first negative output node U 22 A gate G and a source S connected to the first FET 33 a; a first inductance element L1 connected in series between the positive terminal of the first capacitance element C1 and the first positive output node U 11 Between them.
Similarly, the V-phase power supply control loop 30b includes:
a second capacitor element C2 connected in parallel to both ends of the second secondary winding 12b, the positive and negative ends of the second secondary winding 12b passing through the second positive output node V 11 And a second negative output node V 22 A gate G and a source S of the second FET 33b are connected; a second inductance element L2 connected in series with the positive terminal of the second capacitance element C2 and the second positive output node V 11 Between them.
Similarly, the W-phase power supply control circuit 30c includes:
a third capacitor element C3 connected in parallel to both ends of the third secondary coil 12C, the positive and negative ends of the third secondary coil 12C passing through a third positive output node W 11 And a third negative output node W 22 A gate G and a source S of the third FET 33c are connected; third inductance element L3 connected in seriesAt the positive electrode terminal of the third capacitor element C3 and the third positive electrode output node W 11 Between them.
And shaping and freewheeling pulse signals from the corresponding secondary coil into direct current signals through the corresponding capacitive elements and the corresponding inductive elements so as to drive the corresponding field effect transistor to work.
As further shown in connection with fig. 5-8, in some embodiments, the U-phase power control loop 30a further includes:
the first conducting diode D11 is connected in series between the positive terminal of the first secondary winding 12a and the positive terminal of the first capacitive element C1, so as to ensure the forward conduction of the first secondary winding 12 a;
a first load resistor R11 connected in parallel with the first positive output node U 11 And a first negative output node U 22 The dummy load of the first secondary coil 12a ensures the stability of the driving voltage of the first field effect transistor 33 a;
a first zener diode D12 connected in anti-parallel with the first positive output node U 11 And a first negative output node U 22 Between, protect the diode with the voltage limit used as the first field effect transistor 33 a;
the first freewheeling diode D13 is antiparallel between the drain D and the source S of the first fet 33a to realize freewheeling protection for the first fet 33 a. Further, the source S and drain D of the first fet 33a are connected between the U-PHASE winding motor_u and the U-PHASE winding power supply terminal phase_u.
Similarly, the V-phase power supply control loop 30b further includes:
the second conducting diode D21 is connected in series between the positive terminal of the second secondary winding 12b and the positive terminal of the second capacitive element C2, so as to ensure the forward conduction of the second secondary winding 12 b;
a second load resistor R22 connected in parallel with the second positive output node V 11 And a second negative output node V 22 The dummy load of the second secondary winding 12b is used to ensure the stability of the driving voltage of the second field effect transistor 33 b;
a second zener diode D22 connected in anti-parallel with the second positive output node V 11 And a second negative output node V 22 A voltage limiting protection diode serving as a second field effect transistor 33 b;
the second freewheeling diode D23 is antiparallel between the drain D and the source S of the second fet 33b to realize freewheeling protection for the second fet 33 b. Further, the source S and drain D of the second fet 33b are connected between the V-PHASE winding motor_v and the V-PHASE winding supply terminal phase_v.
Similarly, the W-phase power supply control loop 30c further includes:
a third conducting diode D31 connected in series between the positive terminal of the third secondary winding 12C and the positive terminal of the third capacitive element C3 to ensure the forward conduction of the third secondary winding 12C;
a third load resistor R33 connected in parallel with the third positive output node W 11 And a third negative electrode output node W 22 The dummy load of the third secondary coil 12c ensures the stability of the driving voltage of the third fet 33 c;
a third zener diode D32 connected in anti-parallel with the third positive output node W 11 And a third negative electrode output node W 22 A voltage limiting protection diode serving as a third field effect transistor 33 c;
the third freewheeling diode D33 is antiparallel between the drain D and the source S of the third fet 33c to realize freewheeling protection for the third fet 33 c. Further, the source S and drain D of the third fet 33c are connected between the W-PHASE winding motor_w and the W-PHASE winding power supply terminal phase_w.
FIG. 9 shows voltage signals at various signal terminals of a motor drive apparatus in accordance with an embodiment of the present utility model; the normal driving operation phase and the protection triggering operation phase of the motor driving apparatus are illustrated below with reference to fig. 2 to 9.
In the normal drive operation phase 910:
when the controller connected to the and gate chip 200 inputs the continuous high level control signal and the other high level pulse control signal to one of the first control signal input terminal IN1 and the second control signal input terminal IN 2. The and gate chip 200 transmits a high-level pulse signal to the first optocoupler module 21 through the driving signal input terminal S1 after operation.
When the driving signal input terminal S1 is at a high level, the first light emitting element 21a in the first optocoupler chip 21c is turned on, the first photosensitive element 21b is turned on, the two input terminals of the operational amplifier 22 generate a potential difference, and the operational amplifier 22 outputs a high level; accordingly, the second variable resistor Q2 is turned on, the second light emitting element 23a in the second optocoupler chip 23c emits light, and the second photosensor 23b is turned on, so that the series node N1 outputs a high level.
When the serial node N1 outputs high level, the third variable resistor Q3 is conducted, so that the third light-emitting element LED emits light; at this time, the driving signal output terminal S2 outputs a low level signal.
When the driving signal input terminal S1 is at a low level, the first light emitting element 21a does not operate, the first photosensitive element 21b is in an off state, no potential difference exists between the two input terminals of the operational amplifier 22, and the operational amplifier 22 outputs a low level; at this time, the second variable resistor Q2 is turned off, the second light emitting element 23a does not emit light, the second photosensor 23b is turned off, and the series node N1 outputs a low level.
When the series node N1 outputs a low level, the third variable resistor Q3 is turned off, the third light emitting element LED does not emit light, and the driving signal output terminal S2 outputs a high level signal.
Further, when the driving signal output terminal S2 outputs a low level, the primary winding 11 of the transformer 10 has a current passing therethrough; when the driving signal output terminal S2 outputs a high level, no current passes through the primary coil 10. IN this way, by inputting the continuous high level control signal and the high level pulse control signal to the first control signal input terminal IN1 and the second control signal input terminal IN2, respectively, a pulse change signal is formed IN the primary coil 11. The pulse change signal is preferably a high-frequency pulse signal to facilitate miniaturization of the transformer 10 and to improve control accuracy.
The pulse change signal in the primary winding 11 can be sensed by the secondary winding 12, shaped and freewheeled by the capacitive elements C1, C2, C3 and the inductive elements L1, L2, L3 to become the corresponding DC signal U GS The corresponding field effect transistors 33a, 33b are driven respectivelyAnd 33 c.
The turns ratio of the primary winding 11 and the secondary winding 12 can be adjusted according to practical situations to realize the rising and falling of the driving voltage of the field effect transistor.
In the protection trigger working phase 920:
when the controller connected to the and gate chip 200 senses abnormal conditions such as abnormal fault information and the like and needs to perform power-off protection on the motor, the driving signal input end S1 of the driving control loop 20 can continuously input a low-level signal only by inputting a continuous low-level signal (trigger protection signal) to at least one of the first control signal input end IN1 and the second control signal input end IN2, so that the driving signal output end S2 continuously outputs a high-level signal, at this time, the secondary coil 12 cannot generate induced current, and the field effect transistors 33a, 33b and 33c are IN a cut-off state, thereby realizing power-off protection on the motor.
The embodiment of the utility model also provides an electric power steering system, and a power-assisted motor of the electric power steering system is provided with the motor driving device described in any embodiment.
The electric power steering system can realize stable and reliable driving control of the power motor through the motor driving device, so that the driving signal of the driving control loop 20 is not influenced by the interference signal of the power supply control loop 30 during normal operation of the power motor, and the power-off protection of the power motor can be realized through the driving control loop 20 to output a protection triggering signal and controlling the power supply control loop 30 under abnormal working conditions.
In summary, the motor driving device of the utility model utilizes the isolation characteristic of the transformer 10 to realize the complete isolation of the driving control loop 20 and the power supply control loop 30 of the motor, avoid the crosstalk between the driving control loop and the power supply control loop, and realize the stable and reliable driving control of the motor; the motor driving device adopts common electronic elements with proper volume, and can realize low-cost and simple and compact circuit layout.
The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (12)

1. A motor drive apparatus, comprising:
the transformer comprises a primary coil and at least one secondary coil;
the drive control loop comprises a first optical coupler module connected with a drive signal input end, an operational amplifier connected with the first optical coupler module, a second optical coupler module connected with the operational amplifier and a drive signal output end connected with the second optical coupler module, and the drive signal output end and the primary coil are connected in series with a drive power supply end;
and the grid electrode and the source electrode of the field effect tube are respectively connected with two ends of the corresponding secondary side coil.
2. The motor drive of claim 1, wherein the first optocoupler module comprises:
the control end of the first variable resistor is connected with the driving signal input end;
the first photosensitive element and the first light emitting element are packaged in a first optocoupler chip, and two input ends of the operational amplifier are respectively connected with two output ends of the first photosensitive element.
3. The motor drive of claim 2, further comprising a first protection resistor connected between the drive signal input terminal and a control terminal of the first variable resistor.
4. The motor drive of claim 1, wherein the drive control circuit further comprises:
and the AND gate chip is provided with at least two control signal input ends, and the output end of the AND gate chip is connected with the driving signal input end.
5. The motor drive of claim 1, wherein the second optocoupler module comprises:
the control end of the second variable resistor is connected with the output end of the operational amplifier;
the driving signal output end is connected with a series node of the second photosensitive element and the second protection resistor.
6. The motor drive of claim 5, further comprising:
a third protection resistor connected between the second light emitting element and the second variable resistor; and/or
And the pull-up resistor is connected between the driving power supply end and the output end of the operational amplifier.
7. The motor drive of claim 1, wherein the drive control circuit further comprises:
the control end of the third variable resistor is connected with the output end of the second optocoupler module, and the driving signal output end is led out from a serial node of the third light-emitting element and the third variable resistor.
8. The motor drive of claim 7, further comprising:
the fourth protection resistor is connected between the driving power supply end and the third light-emitting element; and/or
The fifth protection resistor is connected between the output end of the second optocoupler module and the control end of the third variable resistor; and/or
And the pull-down resistor is connected between the control end of the third variable resistor and the grounding end.
9. The motor drive of claim 1, wherein the power supply control circuit for each phase further comprises:
the capacitor element is connected in parallel with two ends of the secondary side coil, and the positive electrode end and the negative electrode end of the secondary side coil are respectively connected with the grid electrode and the source electrode of the field effect tube through a positive electrode output node and a negative electrode output node;
and the inductance element is connected in series between the positive electrode end of the capacitance element and the positive electrode output node.
10. The motor drive of claim 9, wherein the power supply control loop for each phase further comprises:
a conduction diode connected in series between the positive electrode end of the secondary coil and the positive electrode end of the capacitive element; and/or
The load resistor is connected in parallel between the positive output node and the negative output node; and/or
The voltage stabilizing diode is in antiparallel connection between the positive electrode output node and the negative electrode output node; and/or
And the freewheeling diode is in antiparallel connection between the drain electrode and the source electrode of the field effect transistor.
11. Motor drive according to any of claims 1-10, wherein the motor is a three-phase motor, the power supply control loop comprising a U-phase power supply control loop connecting the U-phase windings of the three-phase motor, a V-phase power supply control loop connecting the V-phase windings of the three-phase motor and a W-phase power supply control loop connecting the W-phase windings of the three-phase motor.
12. An electric power steering system, characterized in that a power-assisted motor of the electric power steering system is provided with a motor drive apparatus as claimed in any one of claims 1-11.
CN202320983577.3U 2023-04-26 2023-04-26 Motor drive device and electric power steering system Active CN219760883U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320983577.3U CN219760883U (en) 2023-04-26 2023-04-26 Motor drive device and electric power steering system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320983577.3U CN219760883U (en) 2023-04-26 2023-04-26 Motor drive device and electric power steering system

Publications (1)

Publication Number Publication Date
CN219760883U true CN219760883U (en) 2023-09-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320983577.3U Active CN219760883U (en) 2023-04-26 2023-04-26 Motor drive device and electric power steering system

Country Status (1)

Country Link
CN (1) CN219760883U (en)

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