CN211557184U - Brushless motor control mechanism - Google Patents
Brushless motor control mechanism Download PDFInfo
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- CN211557184U CN211557184U CN201922320039.2U CN201922320039U CN211557184U CN 211557184 U CN211557184 U CN 211557184U CN 201922320039 U CN201922320039 U CN 201922320039U CN 211557184 U CN211557184 U CN 211557184U
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Abstract
The utility model discloses a brushless motor control mechanism. The control mechanism comprises an inverter circuit and a control circuit, wherein the inverter circuit comprises at least two bridge arms, the bridge arms are a first bridge arm and a second bridge arm, the control circuit controls upper switch tubes and lower switch tubes of the first bridge arm and the second bridge arm to be conducted in at least one state, different bus current values are adopted, the initial position of a rotor is determined according to the current values, the upper switch tubes of the first bridge arm and the lower switch tubes of the second bridge arm are controlled to be conducted for a first preset time at the same time, the first current values can be collected, the upper switch tubes of the first bridge arm are turned off, the lower switch tubes of the second bridge arm are continuously conducted at the same time, the lower switch tubes of the second bridge arm are turned off after the upper switch tubes of the first bridge arm and the lower switch tubes. The utility model discloses a realize the location of current sampling and motor with simple form, reduce peak voltage to the voltage that adds at the switch tube both ends reduces, can reduce the requirement of switch tube, reduce cost.
Description
[ technical field ]
The utility model relates to a brushless noninductive motor control technical field especially relates to a brushless motor control mechanism.
[ background art ]
In order to achieve the start-up of the brushless motor, it is necessary to determine the initial position of the rotor. The permanent magnet motor detects the position of the rotor through the Hall sensor, but the position sensor has high cost, so the brushless sensorless motor is widely applied, the sensorless control mode does not adopt the position sensor, the mode of detecting the bus current can be adopted, different combination switching is carried out on the switch tube of the inverter circuit, positive and negative voltages are led into any two phase windings, the bus current is respectively adopted, the initial position of the rotor is determined according to the relation between the currents, when the switch tube is disconnected for switching, the current cannot suddenly change because the motor winding is inductive, a follow current process can be generated, as shown in a known follow current flow schematic diagram shown in figure 6, if the UV phase is firstly conducted (Q1Q5 is conducted), when the UV phase is switched, the current flowing through the UV phase winding cannot suddenly change because the motor is inductive load, and the current passes through the diode D4 and the U-phase winding, The V-phase winding and the diode D2 freewheel, at this time, the voltage to ground of the V-phase is Vcc + Vds (reverse voltage drop of the switching tube), the winding generates a peak voltage, as shown in fig. 7, the peak voltage value of the V-phase is represented at the line a, and reaches 31V at this time, so that the voltage applied to both ends of the switching tube is too high, and therefore, the peak voltage easily causes insulation damage of the motor winding, and meanwhile, the requirement for the switching tube needs to be increased for normal operation of the circuit, and at this time, the switching tube with a withstand voltage of 40V needs to be adopted, which is high in cost.
Please refer to chinese patent application publication No. CN103618485B, published on 2016, 01, 13, which discloses a method for detecting an initial position of a brushless dc motor without a position sensor, wherein switching tubes are turned on two by two in six three phases, six times of bus current are collected, primary positioning is realized according to a relationship between currents, a critical position of a rotor is determined, and then switching tubes are turned on three by three, secondary positioning is realized, and an accurate position of the rotor is determined.
Therefore, it is necessary to design a new brushless motor positioning system to solve the technical problems in the prior art.
[ contents of utility model ]
To the deficiency of the prior art, an object of the utility model is to provide a can restrain peak voltage's brushless motor control mechanism.
The utility model provides a prior art problem can adopt following technical scheme: the method comprises the following steps: the inverter circuit comprises a positive direct current bus, a negative direct current bus and at least two bridge arms, the bridge arms are a first bridge arm and a second bridge arm, the first bridge arm and the second bridge arm are connected between the positive direct current bus and the negative direct current bus, the first bridge arm and the second bridge arm are respectively provided with an upper switch tube and a lower switch tube, the upper switch tube is connected with the positive direct current bus, the lower switch tube is connected with the negative direct current bus, each lower switch tube is respectively connected with a diode in parallel in a reverse direction, the control circuit controls the upper switch tube and the lower switch tube of the first bridge arm to be conducted in at least one conducting state, the direct current bus current values in different states are adopted, the initial position of the rotor is determined according to the current values, the control circuit controls the upper switch tube of the first bridge arm and the lower switch tube of the second bridge arm to be conducted simultaneously for a first preset time, a first current value can be collected, and the upper switch tube of the first bridge arm is turned, and meanwhile, continuously conducting the lower switching tube of the second bridge arm, forming a follow current loop by the lower switching tube of the second bridge arm and the diode connected in parallel with the lower switching tube of the first bridge arm, and switching off the lower switching tube of the second bridge arm after conducting for a second preset time.
The further improvement scheme is as follows: the control circuit comprises a microprocessor MCU, an MOS drive module and a current sampling circuit.
The further improvement scheme is as follows: the current sampling circuit comprises a sampling resistor and a current detection circuit, and the sampling resistor is arranged on a negative direct current bus of the inverter circuit.
The further improvement scheme is as follows: the microprocessor MCU is connected with an MOS driving module, and the MOS driving module respectively controls the conduction of the switch tubes according to the information of the microprocessor MCU.
The further improvement scheme is as follows: the microprocessor MCU is provided with a storage unit, the current detection circuit is used for detecting the voltage at two ends of the sampling resistor so as to obtain the bus current value, the bus current value is amplified and transmitted to the microprocessor MCU, and the microprocessor stores the bus current values in different conduction states.
The further improvement scheme is as follows: the first predetermined time range is 40us to 200 us.
The further improvement scheme is as follows: the second predetermined time is not less than 160 us.
The further improvement scheme is as follows: the control circuit controls the upper switch tube of the second bridge arm and the lower switch tube of the first bridge arm to be simultaneously conducted for a first preset time, then a second current value can be acquired, the upper switch tube of the second bridge arm is turned off, the lower switch tube of the first bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switch tube of the second bridge arm and the lower switch tube of the first bridge arm form a follow current loop, and the lower switch tube of the first bridge arm is turned off after the second preset time is conducted.
The further improvement scheme is as follows: the bridge arms comprise a third bridge arm, an upper switch tube and a lower switch tube are arranged on the third bridge arm, the upper switch tube is connected with a positive direct-current bus, the lower switch tube is connected with a negative direct-current bus, a control circuit controls the upper switch tube of the first bridge arm and the lower switch tube of the third bridge arm to be simultaneously conducted for a first preset time, a third current value can be collected, the upper switch tube of the first bridge arm is turned off, the lower switch tube of the third bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switch tube of the first bridge arm and the lower switch tube of the third bridge arm form a follow current loop, and the lower switch tube of the third bridge arm is turned off after the second preset time is conducted; and the control circuit controls the upper switching tube of the third bridge arm and the lower switching tube of the first bridge arm to be simultaneously conducted for a first preset time, then a fourth current value can be acquired, the upper switching tube of the third bridge arm is turned off, the lower switching tube of the first bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switching tube of the third bridge arm and the lower switching tube of the first bridge arm form a follow current loop, and the lower switching tube of the first bridge arm is turned off after the upper switching tube of the third bridge arm and the lower switching tube of the first bridge arm are conducted for a second.
The further improvement scheme is as follows: the control circuit controls the upper switching tube of the second bridge arm and the lower switching tube of the third bridge arm to be simultaneously conducted for first preset time, then a fifth current value can be acquired, the upper switching tube of the second bridge arm is turned off, the lower switching tube of the third bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switching tube of the second bridge arm and the lower switching tube of the third bridge arm form a follow current loop, and the lower switching tube of the third bridge arm is turned off after the second preset time is conducted; and the control circuit controls the upper switching tube of the third bridge arm and the lower switching tube of the second bridge arm to be simultaneously conducted for a first preset time, then a sixth current value can be acquired, the upper switching tube of the third bridge arm is turned off, the lower switching tube of the second bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switching tube of the third bridge arm and the lower switching tube of the second bridge arm form a follow current loop, and the lower switching tube of the second bridge arm is turned off after the second preset time is conducted.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model comprises an inverter circuit and a control circuit, wherein the inverter circuit comprises a positive and a negative direct current bus and at least two bridge arms, the bridge arms are a first bridge arm and a second bridge arm, the control circuit controls the upper and the lower switch tubes of the first bridge arm and the second bridge arm to be conducted in at least one conduction state and adopt direct current bus current values in different states, and determines the initial position of a rotor according to the current values, the control circuit controls the upper switch tube of the first bridge arm and the lower switch tube of the second bridge arm to be conducted simultaneously for a first preset time, can collect the first current value and turn off the upper switch tube of the first bridge arm and continue to be conducted simultaneously for the lower switch tube of the second bridge arm, the lower switch tube of the second bridge arm and the diode connected in parallel with the lower switch tube of the first bridge arm form a follow current loop, the lower switch tube of the second bridge arm is turned off after the second preset time is conducted, and the follow current, the peak voltage can be reduced, so that the voltage applied to the two ends of the switching tube is reduced, the selection requirement of the switching tube can be reduced, and the cost is reduced.
[ description of the drawings ]
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:
fig. 1 is a schematic view of the brushless motor control mechanism of the present invention;
fig. 2 is a schematic diagram of the positions of the stator winding and the rotor of the brushless motor according to the present invention;
fig. 3 is a schematic view of the current flow when the UV phase of the brushless motor of the present invention is turned on;
fig. 4 is a schematic current flow diagram of the brushless motor of the present invention;
FIG. 5 is a voltage waveform of the follow current of the present invention;
FIG. 6 is a current flow diagram of a prior art freewheel;
fig. 7 is a voltage waveform of a prior art freewheel.
[ detailed description of the invention ]
The present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Please refer to fig. 1, which is a schematic diagram of a control mechanism of a three-phase brushless motor according to the present invention, the control mechanism of the brushless motor includes a dc power supply, a brushless motor, a three-phase full-bridge inverter circuit, and a control circuit. The brushless motors are in star connection, and can be in triangular connection; the three-phase full-bridge inverter circuit inverts direct current provided by the direct current power supply into alternating current to supply power to a three-phase winding of the brushless motor; the control circuit comprises a microprocessor MCU, an MOS drive module and a current sampling circuit, wherein the MOS drive module responds to a control signal received from the microprocessor MCU to drive the switching tube of the three-phase full-bridge inverter circuit to be switched on and off.
The inverter circuit control of the two arms is explained as follows: the control mechanism of the brushless motor comprises an inverter circuit and a control circuit, wherein the inverter circuit comprises a positive direct current bus, a negative direct current bus, a first bridge arm and a second bridge arm, the first bridge arm and the second bridge arm are connected between the positive direct current bus and the negative direct current bus, an upper switching tube and a lower switching tube are respectively arranged on the first bridge arm and the second bridge arm, the upper switching tube is connected with the positive direct current bus, the lower switching tube is connected with the negative direct current bus, each upper switching tube and each lower switching tube are respectively connected with a diode in parallel in a reverse direction, in some structures, the diodes are parasitic diodes of MOS (metal oxide semiconductor) tubes or other transistors, in other structures, the diodes can be connected with other switching tubes in parallel, the control circuit controls the upper switching tube and the lower switching tube to be conducted in at least one conducting state, the direct current bus current values in different states are adopted, the initial position of a rotor is determined according to the current values, the control circuit controls the upper switching tube of the first bridge arm and the lower, the first current value can be collected, the upper switch tube of the first bridge arm is turned off, the lower switch tube of the second bridge arm is continuously conducted, the lower switch tube of the second bridge arm and the diode connected in parallel with the lower switch tube of the first bridge arm form a follow current loop, and the lower switch tube of the second bridge arm is turned off after the second preset time is conducted.
In the present embodiment, the three-phase full-bridge inverter circuit includes a positive-negative dc bus, a first bridge arm, a second bridge arm, and a third bridge arm, each bridge arm is connected between the positive-negative dc bus, and the first bridge arm is composed of a first switching tube Q1 (also called an upper switch) and a fourth switching tube Q4 (also called a lower switch) connected in series; the second bridge arm consists of a second switching tube Q2 (also called an upper switch) and a fifth switching tube Q5 (also called a lower switch) which are connected in series; the third bridge arm consists of a third switch tube Q3 (also called an upper switch) and a sixth switch tube Q6 (also called a lower switch) which are connected in series, and each upper switch tube and each lower switch tube are respectively connected with diodes D1-D6 in parallel in the reverse direction; the brushless motor comprises a first phase U, a second phase V and a third phase W, wherein one end of the three-phase winding is connected with one point, the other end of the first phase U is connected with the midpoint of the first bridge arm, the other end of the second phase V is connected with the midpoint of the second bridge arm, and the other end of the third phase W is connected with the midpoint of the third bridge arm.
The control circuit comprises a microprocessor MCU, an MOS drive module and a current sampling circuit, wherein the sampling circuit comprises a sampling resistor R1 arranged on a negative direct current bus and a current detection circuit connected to two ends of a sampling resistor R1, and the voltage at two ends of the sampling resistor R1 is detected, so that the current flowing through the bus is obtained, and the bus current is amplified and transmitted to the microprocessor MCU. The microprocessor MCU adopts a three-phase six-state two-to-two conduction mode, each state is that an upper switch tube of one bridge arm and a lower switch tube of any other bridge arm are two-to-two conducted, and an upper switch tube and a lower switch tube of the same bridge arm can not be conducted simultaneously, so that the inverter circuit can control the switch tubes to be conducted in the following six states respectively: the phase-change method of the motor comprises the following steps that Q1Q5 is conducted, Q1Q6 is conducted, Q2Q4 is conducted, Q2Q6 is conducted, Q3Q4 is conducted, and Q3Q5 is conducted, phase change of the motor is achieved through switching of six states, as shown in fig. 2, the motor is a schematic diagram of a stator winding structure and a rotor position of the motor, the stator winding structure forms 6 sectors, each sector corresponds to a position area where the rotor is located, and each position area corresponds to conduction of every two switching tubes. In the initial positioning, the microprocessor MCU controls the MOS driving module to conduct two UV phases (Q1 and Q5), samples a bus current once, sequentially conducts two VU phases (Q2 and Q4 are conducted), two UW phases (Q1 and Q6 are conducted), two WU phases (Q3 and Q4 are conducted), two VW phases (Q2 and Q6 are conducted), and two WV phases (Q3 and Q5 are conducted), samples bus current values Iuv, Ivu, Iuw, Iwu, Ivw and Iwu, respectively, calculates positive and negative current differences I1 | (Iuv-Ivu |, I2 | -Iuw-Iwu |, and I3 | -Ivw-Iwv |, compares the six bus current values and the three positive and negative current differences with a relationship between a current stored in a memory inside the microprocessor MCU and an initial position of the rotor (refer to a table), after the position is obtained, referring to a working switching tube (refer to table two) which is stored in the initial position of the rotor of the microprocessor MCU and needs to be opened, as shown in fig. 2, if the initial position of the rotor is position 1, the microprocessor MCU controls the MOS driving module to open the switching tube Q1Q5 first, and then to be circularly conducted in the sequence of Q1Q5, Q1Q6, Q2Q4, Q3Q4, and Q3Q5, so that the rotor rotates counterclockwise, and if the rotor needs to rotate clockwise, the switching tubes are circularly conducted in the reverse sequence; if the initial position of the rotor is position 2, the microprocessor MCU controls the MOS drive module to open the switching tube Q1Q6, and then the switching tube Q1Q6 is circularly switched on in the sequence of Q1Q6, Q2Q4, Q3Q5 and Q1Q5, so that the rotor rotates anticlockwise, and if the rotor rotates clockwise, the switching tube is circularly switched on in the reverse sequence; and (3) detecting different initial positions of the rotor, firstly opening the switching tubes corresponding to the positions of the rotor according to the second meter, conducting according to the circulation sequence, detecting the zero crossing point of the back electromotive force through a back electromotive force detection circuit in the rotation process, determining the position of the rotor, and controlling the phase change of the rotor.
And the first table shows the position relation between each bus current and the rotor.
And the second table is a working switching tube which is corresponding to the position of each rotor and needs to be opened.
When sampling current, need to switch on switch tube Q1Q5, Q2Q4, Q1Q6, Q3Q4, Q2Q6, Q3Q5 in proper order, as shown in FIG. 3, for the utility model discloses current flow direction sketch map when brushless motor UV switches on mutually, switch tube Q1Q5 switches on, and the electric current passes through the anodal BAT +, switch tube Q1, U phase winding, V phase winding, switch tube Q5 inflow ground wire, microprocessor MCU sampling bus current Iuv, after switch tube Q1Q5 switches on a period, switch tube Q1Q5 need break off, and switch tube Q2Q4 switches on, sampling bus current Ivu. As shown in fig. 4, for the current flow direction of the follow current in this embodiment, after the microprocessor MCU controls Q1Q5 to be turned on for 180us for the first predetermined time, the bus current Iuv is sampled, after the current Iuv is sampled, the upper switch tube Q1 is turned off first, and the lower switch tube Q5 is kept turned on for 180us in a delayed manner, at this time, since the current of the UV phase winding cannot suddenly change, the current forms a loop through the diode D4, the U phase winding, the V phase winding, and the switch tube Q5, so as to implement the follow current, and after the current is consumed, the switch tube Q5 is turned off, at this time, the peak voltage value of the V phase is shown as a line in fig. 5, and the peak voltage value is reduced to 26. The microprocessor controls the switch tube Q2Q4 to be conducted, when the switch tube Q2Q4 is conducted for 180us within the first preset time, the bus current Ivu is sampled, after the current Ivu is sampled, the upper switch tube Q2 is turned off firstly, the lower switch tube Q4 is kept to be conducted for 180us in a delayed mode, at the moment, the current forms a loop through the diode D5, the V-phase winding, the U-phase winding and the switch tube Q4, follow current is achieved, and after the current is consumed, the switch tube Q4 is turned off; the microprocessor controls the switch tube Q1Q6 to be conducted, when the switch tube Q1Q6 is conducted for 180us within the first preset time, the bus current Iuw is sampled, after the current Iuw is sampled, the upper switch tube Q1 is turned off firstly, the lower switch tube Q6 is kept to be conducted for 180us in a delayed mode, at the moment, the current forms a loop through the diode D4, the U-phase winding, the W-phase winding and the switch tube Q6, follow current is achieved, and after the current is consumed, the switch tube Q6 is turned off; the microprocessor controls the switch tube Q3Q4 to be conducted, when the switch tube Q3Q4 is conducted for 180us within the first preset time, the bus current Iwu is sampled, after the current Iwu is sampled, the upper switch tube Q3 is turned off firstly, the lower switch tube Q4 is kept to be conducted for 180us in a delayed mode, at the moment, the current forms a loop through a diode D6, a W-phase winding, a U-phase winding and the switch tube Q4, follow current is achieved, and after the current is consumed, the switch tube Q4 is turned off; the microprocessor controls the switch tube Q2Q6 to be conducted, when the switch tube Q2Q6 is conducted for 180us within the first preset time, the bus current Ivw is sampled, after the current Ivw is sampled, the upper switch tube Q2 is turned off firstly, the lower switch tube Q6 is kept to be conducted for 180us in a delayed mode, at the moment, the current forms a loop through the diode D5, the V-phase winding, the W-phase winding and the switch tube Q6, follow current is achieved, and after the current is consumed, the switch tube Q6 is turned off; the microprocessor controls the switch tube Q3Q5 to be conducted, when the switch tube Q3Q5 is conducted for 180us in first preset time, the bus current Iwv is sampled, after the current Iwv is sampled, the upper switch tube Q3 is turned off firstly, the lower switch tube Q5 is kept to be conducted for 180us in a delayed mode, at the moment, the current forms a loop through the diode D6, the W-phase winding, the V-phase winding and the switch tube Q5, follow current is achieved, after the current is consumed, the switch tube Q5 is turned off, namely, when six bus currents are sampled, peak voltage is reduced, meanwhile, voltage applied to two ends of the switch tube is reduced to 26.6V, the switch tube with the withstand voltage of 30V can be selected, normal operation of the circuit can be guaranteed, and cost is saved.
The utility model discloses control mechanism is when two switch tube conductions of every state switch, switch tube on the earlier disconnection, switch tube under the time delay conductions simultaneously, make the parallelly connected diode of the lower switch tube that the last switch tube of this state corresponds the bridge arm, the lower switch tube that corresponds winding and this state forms the afterflow return circuit, reduce peak voltage, draw down the terminal voltage of switch tube, according to the difference of circuit, this structure can make peak voltage reduce more, therefore, can reduce the requirement of switch tube, select withstand voltage lower switch tube, and the cost is saved.
The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many other alternatives to the brushless motor control mechanism may be devised without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.
Claims (10)
1. A brushless motor control mechanism comprising: the control circuit controls the upper and lower switch tubes to be conducted in at least one conduction state, adopts direct current bus current values in different states, and determines the initial position of the rotor according to the current values; the method is characterized in that: the control circuit controls the upper switch tube of the first bridge arm and the lower switch tube of the second bridge arm to be simultaneously conducted for a first preset time, then a first current value can be acquired, the upper switch tube of the first bridge arm is turned off, the lower switch tube of the second bridge arm is continuously conducted at the same time, the lower switch tube of the second bridge arm and the diode connected in parallel with the lower switch tube of the first bridge arm form a follow current loop, and the lower switch tube of the second bridge arm is turned off after the second preset time is conducted.
2. The brushless motor control mechanism of claim 1, wherein: the control circuit comprises a microprocessor MCU, an MOS drive module and a current sampling circuit.
3. The brushless motor control mechanism of claim 2, wherein: the current sampling circuit comprises a sampling resistor and a current detection circuit, and the sampling resistor is arranged on a negative direct current bus of the inverter circuit.
4. The brushless motor control mechanism of claim 2, wherein: the microprocessor MCU is connected with an MOS driving module, and the MOS driving module respectively controls the conduction of the switch tubes according to the information of the microprocessor MCU.
5. The brushless motor control mechanism of claim 3, wherein: the microprocessor MCU is provided with a storage unit, the current detection circuit is used for detecting the voltage at two ends of the sampling resistor so as to obtain the bus current value, the bus current value is amplified and transmitted to the microprocessor MCU, and the microprocessor stores the bus current values in different conduction states.
6. The brushless motor control mechanism of claim 1, wherein: the first predetermined time range is 40us to 200 us.
7. The brushless motor control mechanism of claim 1, wherein: the second predetermined time is not less than 160 us.
8. The brushless motor control mechanism of claim 1, wherein: the control circuit controls the upper switch tube of the second bridge arm and the lower switch tube of the first bridge arm to be simultaneously conducted for a first preset time, then a second current value can be acquired, the upper switch tube of the second bridge arm is turned off, the lower switch tube of the first bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switch tube of the second bridge arm and the lower switch tube of the first bridge arm form a follow current loop, and the lower switch tube of the first bridge arm is turned off after the second preset time is conducted.
9. The brushless motor control mechanism of claim 1, wherein: the bridge arms comprise a third bridge arm, an upper switch tube and a lower switch tube are arranged on the third bridge arm, the upper switch tube is connected with a positive direct-current bus, the lower switch tube is connected with a negative direct-current bus, a control circuit controls the upper switch tube of the first bridge arm and the lower switch tube of the third bridge arm to be simultaneously conducted for a first preset time, a third current value can be collected, the upper switch tube of the first bridge arm is turned off, the lower switch tube of the third bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switch tube of the first bridge arm and the lower switch tube of the third bridge arm form a follow current loop, and the lower switch tube of the third bridge arm is turned off after the second preset time is conducted; and the control circuit controls the upper switching tube of the third bridge arm and the lower switching tube of the first bridge arm to be simultaneously conducted for a first preset time, then a fourth current value can be acquired, the upper switching tube of the third bridge arm is turned off, the lower switching tube of the first bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switching tube of the third bridge arm and the lower switching tube of the first bridge arm form a follow current loop, and the lower switching tube of the first bridge arm is turned off after the upper switching tube of the third bridge arm and the lower switching tube of the first bridge arm are conducted for a second.
10. The brushless motor control mechanism of claim 1 or 9, wherein: the control circuit controls the upper switching tube of the second bridge arm and the lower switching tube of the third bridge arm to be simultaneously conducted for first preset time, then a fifth current value can be acquired, the upper switching tube of the second bridge arm is turned off, the lower switching tube of the third bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switching tube of the second bridge arm and the lower switching tube of the third bridge arm form a follow current loop, and the lower switching tube of the third bridge arm is turned off after the second preset time is conducted; and the control circuit controls the upper switching tube of the third bridge arm and the lower switching tube of the second bridge arm to be simultaneously conducted for a first preset time, then a sixth current value can be acquired, the upper switching tube of the third bridge arm is turned off, the lower switching tube of the second bridge arm is continuously conducted at the same time, a diode connected in parallel with the lower switching tube of the third bridge arm and the lower switching tube of the second bridge arm form a follow current loop, and the lower switching tube of the second bridge arm is turned off after the second preset time is conducted.
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| CN201922320039.2U CN211557184U (en) | 2019-12-20 | 2019-12-20 | Brushless motor control mechanism |
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| CN201922320039.2U CN211557184U (en) | 2019-12-20 | 2019-12-20 | Brushless motor control mechanism |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117938A (en) * | 2019-12-20 | 2020-12-22 | 江苏东成工具科技有限公司 | Brushless motor current sampling method and brushless motor control mechanism |
| CN112202369A (en) * | 2020-09-27 | 2021-01-08 | 湖南大学 | Single-direct-current bus current sampling high-inertia permanent magnet synchronous motor speed-increasing and re-throwing method |
| CN112532219A (en) * | 2020-11-27 | 2021-03-19 | 广州极飞科技有限公司 | Bidirectional current control method and circuit |
| CN113193795A (en) * | 2021-05-26 | 2021-07-30 | 深圳市好盈科技有限公司 | Intelligent synchronous rectification system of electronic speed regulator and control method thereof |
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2019
- 2019-12-20 CN CN201922320039.2U patent/CN211557184U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117938A (en) * | 2019-12-20 | 2020-12-22 | 江苏东成工具科技有限公司 | Brushless motor current sampling method and brushless motor control mechanism |
| CN112202369A (en) * | 2020-09-27 | 2021-01-08 | 湖南大学 | Single-direct-current bus current sampling high-inertia permanent magnet synchronous motor speed-increasing and re-throwing method |
| CN112202369B (en) * | 2020-09-27 | 2021-12-03 | 湖南大学 | Single-direct-current bus current sampling high-inertia permanent magnet synchronous motor speed-increasing and re-throwing method |
| CN112532219A (en) * | 2020-11-27 | 2021-03-19 | 广州极飞科技有限公司 | Bidirectional current control method and circuit |
| CN113193795A (en) * | 2021-05-26 | 2021-07-30 | 深圳市好盈科技有限公司 | Intelligent synchronous rectification system of electronic speed regulator and control method thereof |
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