CN205123638U - DC motor controlling circuit - Google Patents
DC motor controlling circuit Download PDFInfo
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- CN205123638U CN205123638U CN201520827996.3U CN201520827996U CN205123638U CN 205123638 U CN205123638 U CN 205123638U CN 201520827996 U CN201520827996 U CN 201520827996U CN 205123638 U CN205123638 U CN 205123638U
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Abstract
The utility model discloses a DC motor controlling circuit, including the control unit, drive unit, overvoltage protection unit and overcurrent protection unit, wherein, the control unit is used for output control motor rotation's DIR signal to and control motor rotation number's PWM signal, drive unit is coupled in the motor, receives this DIR signal and this PWM signal to control respectively according to this DIR signal and this PWM signal turning to and the rotational speed of motor, the overcurrent protection unit is coupled in drive unit to this operating current detects drive unit's operating current, and overflow the signal to the control unit output no. 1 when being greater than a reference value, the overvoltage protection unit is coupled in drive unit to detect drive unit's operating voltage, and export the pressure measurement signal about this operating voltage to the control unit. The utility model discloses can solve the problem that the chip burnt out because of the excessive pressure.
Description
Technical field
The utility model relates to automation field, especially relates to a kind of DC motor control circuit.
Background technology
DC motor control circuit, for controlling the rotating speed of direct current machine and turning to.
In the control system of reality, need to control motor positive and inverse, to be with dynamic load to realize positive movement or counter motion, wherein, can realize controlling motor positive and inverse by the mode of Switching power polarity.
Along with the development of power electronic technology, high power switch is promoted, the control mode being controlled motor positive and inverse by high-power switch device can improve switching rate, and progressively instead of the control mode of original Switching power.After this, engender with single-chip microcomputer to be core, export 4 road PWM to drive the control mode of H bridge, but this control mode needs the switch Delayed conducting on the single brachium pontis of Single-chip Controlling H bridge, and the resource taking single-chip microcomputer is larger.
As improvement, existing notification number is that the one that patent discloses of CN104065315A has brushless motor many close-loop driven controller, comprise host computer, communication interface modules, MCU control module, motor drive module, information acquisition module and power module, host computer is connected with MCU control module input by communication interface modules, MCU control module output is connected with motor drive module input, motor drive module output is connected with direct current machine, information acquisition module input is connected with motor drive module and direct current machine, information acquisition module output is connected with MCU control module, communication interface modules, MCU control module is all connected with power module with motor drive module, described motor drive module comprises two and half bridge control chips and H-bridge drive circuit.
In the accompanying drawing 6 of above-mentioned patent, two outputs (being respectively used to output pwm signal and DIR signal) connecting microcontroller are connected to half bridge control chip by logic gates (being made up of components and parts U3, U4 and U6 in figure), by exporting turning to of DIR signal control motor, controlled the rotating speed of motor by output pwm signal, solve and take the large problem of mcu resource.
But, when the circuit working of above-mentioned controller, unavoidably along with the intensification of components and parts, the parameter of some of them components and parts is subject to temperature rise impact and occurs change, also or by the impact of electrostatic, finally occurs overvoltage phenomenon, burn out chip, cause circuit normally to work.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of DC motor control circuit, can solve the problem that chip burns out because of overvoltage.
For achieving the above object, the invention provides following technical scheme: a kind of DC motor control circuit, comprises,
Control unit, for exporting the DIR signal controlling motor steering, and controls the pwm signal of motor speed;
Driver element, is coupled to motor, receives this DIR signal and this pwm signal, and controls turning to of described motor and rotating speed respectively according to this DIR signal and this pwm signal;
Overvoltage protecting unit, is coupled to driver element, to detect the operating voltage of driver element, and exports the pressure measurement signal being relevant to this operating voltage to control unit.
The utility model is set to further: described DIR signal comprises a DIR signal and the 2nd DIR signal with a DIR signals reverse, the second pwm signal that described pwm signal comprises the first pwm signal and interlocks with this first pwm signal;
Described control unit comprises MCU unit and is coupled to the signal conversion unit of MCU unit, and described signal conversion unit comprises,
First output, for exporting a DIR signal;
Second output, for exporting the 2nd DIR signal;
3rd output, for exporting this first pwm signal;
4th output, for exporting this second pwm signal.
The utility model is set to further: described signal conversion unit comprises,
Not circuit, comprises the input that is coupled to the first output of MCU unit, and an output;
First AND circuit, comprises the input that is coupled to the second output of MCU unit, an input being coupled to not circuit output, and one for exporting the output of this first pwm signal;
Second AND circuit, comprises the input that two are respectively coupled to first and second output of MCU unit, and one for exporting the output of this second pwm signal.
The utility model is set to further: described driver element comprises,
H-bridge drive circuit, is coupled to motor;
First control part, has one and receives the input of a DIR signal, and an output being coupled to one of them switching device of brachium pontis on described H bridge;
Second control part, has one and receives the input of the 2nd DIR signal, and an output being coupled to wherein another switching device of brachium pontis on described H bridge;
Under described H bridge, two switching devices of brachium pontis are respectively used to receive this first pwm signal and this second pwm signal.
The utility model is set to further: described Overvoltage protecting unit comprises,
Partial pressure unit, has the input that two are respectively coupled to VCC end and GND end, and foundation VCC voltage exports this pressure measurement signal that an amplitude is less than this VCC voltage;
Voltage regulation unit, is coupled to described partial pressure unit, makes this pressure measurement signal keep stablizing and exporting described MCU unit to.
The utility model is set to further: on described H bridge, the common port of brachium pontis and VCC are coupled with insurance resistance between holding.
The utility model is set to further: an input of described partial pressure unit is held by described insurance resistance and VCC and coupled.
The utility model is set to further: also comprise,
Over-current protecting unit, is coupled to driver element, to detect the operating current of driver element, and exports an over-current signal when this operating current is greater than a reference value to control unit.
The utility model is set to further: under described H bridge, the common port of brachium pontis and GND are coupled with sampling resistor between holding,
Described over-current protecting unit detects the operating current of driver element by described sampling resistor.
By adopting technique scheme, the utility model control unit only exports the first pwm signal or the second pwm signal, and export two reverse DIR signals and the 2nd DIR signal, thus control drive unit drives motor positive and inverse, decrease taking mcu resource, take gate to first, second pwm signal simultaneously, and the control of first, second DIR signal, can avoid because of first, second pwm signal, or first, second DIR signal is identical, causes the short circuit of H bridge and burn the switching device of H bridge.In addition, feed back over-current signal and pressure measurement signal by over-current protecting unit and Overvoltage protecting unit respectively to MCU unit, one conveniently avoids over current of motor to run, and avoids motor overvoltages to run on the other hand, and prevents chip overvoltage from burning out.
Accompanying drawing explanation
Fig. 1 is functional block diagram of the present utility model;
Fig. 2 is the schematic diagram of control unit in Fig. 1;
Fig. 3 is the schematic diagram of driver element in Fig. 1;
Fig. 4 is the schematic diagram of Overvoltage protecting unit in Fig. 1;
Fig. 5 is the schematic diagram of over-current protecting unit in Fig. 1.
Reference numeral: 100, control unit; 110, MCU unit; 120, signal conversion unit; 200, driver element; 210, H-bridge drive circuit; 220, the first control part; 230, the second control part; 300, Overvoltage protecting unit; 310, partial pressure unit; 320, voltage regulation unit; 400, over-current protecting unit; 410, reference voltage output unit; PWM-1-A, the first pwm signal; PWM-1-B, the second pwm signal; DIR-I-1, a DIR signal; DIR-I-2, the 2nd DIR signal; ADC-L, over-current signal; SEN1, pressure measurement signal.
Embodiment
Referring to figs. 1 through Fig. 5, the embodiment of this DC motor control circuit is described further.
A DIR signal in claims, the 2nd DIR signal, the first pwm signal and the second pwm signal are expressed as signal DIR-I-1, signal DIR-I-2, signal PWM-1-A and signal PWM-1-B in the present embodiment.
The first pwm signal in claims and the second pwm signal interlock and mean: when output the first pwm signal, the second pwm signal does not export; When output the second pwm signal, the first pwm signal does not export.
A DIR signal in claims and the 2nd DIR signal are digital signal, and a DIR signal and the 2nd DIR signals reverse mean: when a DIR signal is 1, the 2nd DIR signal is 0; When the 2nd DIR signal is 1, a DIR signal is 0.
Describe based on above-mentioned, below further disclosed embodiment:
With reference to Fig. 1, the DC motor control circuit in the present embodiment can be divided into control unit 100, driver element 200, Overvoltage protecting unit 300 and over-current protecting unit 400 four module; Wherein, control unit 100 is for exporting DIR signal (DIR signal herein comprises signal DIR-I-1 and signal DIR-I-2) and pwm signal (pwm signal herein comprises signal PWM-1-A and signal PWM-1-B) to driver element 200; Driver element 200 receives this DIR signal and this pwm signal controls turning to and rotating speed with motor; Over-current protecting unit 400 is coupled to driver element 200 to detect the operating current of driver element 200, and exports an over-current signal ADC-L when this operating current is greater than a reference value to control unit 100; Overvoltage protecting unit 300 is coupled to driver element 200 to detect the operating voltage of driver element 200, and exports the pressure measurement signal SEN1 being relevant to this operating voltage to control unit 100.
Based on describing in Fig. 1, open to control unit 100, driver element 200, over-current protecting unit 400 and Overvoltage protecting unit 300 respectively below.
With reference to Fig. 2, the control unit 100 in the present embodiment comprises MCU unit 110 and signal conversion unit 120.
Wherein, the first output of MCU unit 110 and the second output are respectively used to export DIR signal and pwm signal, and the first input end of MCU unit 110 and the second input receive over-current signal ADC-L and pressure measurement signal SEN1 respectively.
Wherein, signal conversion unit 120 comprises not circuit U3A, AND circuit U4A and AND circuit U4B.
The input of not circuit U3A is coupled to the first output of MCU unit 110, and output is coupled to an input of AND circuit U4A, produces signal DIR-I-1 and signal DIR-I-2 respectively at the input of not circuit U3A and output; Another input of AND circuit U4A is coupled to the second output of MCU unit 110, and the output of AND circuit U4A is for outputing signal PWM-1-A; An input of AND circuit U4B is coupled to the first output of MCU unit 110, and another input is coupled to the second output of MCU unit 110, and output is for outputing signal PWM-1-B.
Control unit 100 in Fig. 2 works as follows:
Signal DIR-I-1 outputs signal PWM-1-A after not circuit U3A is reverse with after signal PWM and computing, synchronous signal DIR-I-1 and signal PWM directly and after computing outputs signal PWM-1-B, due to not circuit U3A acting in opposition, it is 0 that signal PWM-1-A and signal PWM-1-B Zong You mono-tunnel are exported, wherein signal DIR-I-1(signal DIR) for MCU unit 110 export motor steering control signal.
With reference to Fig. 3, the driver element 200 in the present embodiment comprises H-bridge drive circuit 210H, the first control part 220 and the second control part 230.
Wherein, the concrete introduction of H-bridge drive circuit 210H can chapter 2 in Master's thesis " design studies of H bridge power driving circuit ", and the present embodiment regards it as the known technology of those skilled in the art, therefore repeats no more.It should be noted that on H bridge, brachium pontis is made up of switching device Q3 and switching device Q7, under H bridge, brachium pontis is made up of switching device Q4 and switching device Q8, closes the control pole Received signal strength PWM-1-A of device Q4, closes the control pole Received signal strength PWM-1-B of device Q8.
Wherein, the first control part 220 comprises triode Q1, and the base stage of triode Q1 is used for Received signal strength DIR-I-1, and its collector electrode is coupled to the control pole of one of them switching device Q3 of brachium pontis on H bridge, its grounded emitter.
Wherein, the second control part 230 comprises triode Q11, and the base stage of triode Q11 is used for Received signal strength DIR-I-2, and its collector electrode is coupled to the control pole of wherein another switching device Q7 of brachium pontis on H bridge, its grounded emitter.
Control unit 100 in Fig. 3 works as follows:
Signal DIR-I-1 is opened and shutoff by triode Q1 control switch device Q3's, the switching device Q3 conducting when DIR-I-1 is 1, state due to signal DIR-I-1 makes signal PWM-1-A be 0, signal PWM-1-B is effective, signal DIR-I-2 and signal DIR-I-1 is reverse, signal DIR-I-2 is 0, and now switching device Q7 turns off.Only need control signal PWM-1-B can carry out speed governing to realization to motor.If define now, motor is for rotating forward, and when signal DIR-IO-1 is 0, switching device Q3 turns off, switching device Q7 conducting, and signal PWM-1-A is effective, and signal PWM-1-B is 0, now motor reversal.
With reference to Fig. 4, the Overvoltage protecting unit 300 in the present embodiment comprises partial pressure unit 310 and voltage regulation unit 320.
Wherein, partial pressure unit 310 comprises resistance R52 and the resistance R53 of series connection, the other end of resistance R52 is coupled to VCC end by insurance resistance, the other end ground connection of resistance R53, and the common node of resistance R52 and resistance R53 produces pressure measurement signal SEN1 and exports to voltage regulation unit 320.
Wherein, voltage regulation unit 320 comprises electric capacity C40 and voltage-stabiliser tube D8, and electric capacity C40 and voltage-stabiliser tube D8 is all parallel to the two ends of resistance R53, and voltage regulation unit 320 makes this pressure measurement signal keep stablizing and exporting MCU unit 110 to.
With reference to Fig. 5; over-current protecting unit 400 in the present embodiment comprises comparator U7; with the reference voltage output unit 410 be made up of resistance R36, resistance R37 and resistance R38; the in-phase input end of comparator U7 is coupled to the tie point of brachium pontis and sampling resistor R34 under H bridge; inverting input is coupled to the common node of resistance R37 and resistance R38, and output is used for MCU unit 110 output overcurrent signal ADC-L.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (9)
1. a DC motor control circuit, is characterized in that: comprise,
Control unit, for exporting the DIR signal controlling motor steering, and controls the pwm signal of motor speed;
Driver element, is coupled to motor, receives this DIR signal and this pwm signal, and controls turning to of described motor and rotating speed respectively according to this DIR signal and this pwm signal;
Overvoltage protecting unit, is coupled to driver element, to detect the operating voltage of driver element, and exports the pressure measurement signal being relevant to this operating voltage to control unit.
2. DC motor control circuit according to claim 1, it is characterized in that: described DIR signal comprises a DIR signal and the 2nd DIR signal with a DIR signals reverse, the second pwm signal that described pwm signal comprises the first pwm signal and interlocks with this first pwm signal;
Described control unit comprises MCU unit and is coupled to the signal conversion unit of MCU unit, and described signal conversion unit comprises,
First output, for exporting a DIR signal;
Second output, for exporting the 2nd DIR signal;
3rd output, for exporting this first pwm signal;
4th output, for exporting this second pwm signal.
3. DC motor control circuit according to claim 2, is characterized in that: described signal conversion unit comprises,
Not circuit, comprises the input that is coupled to the first output of MCU unit, and an output;
First AND circuit, comprises the input that is coupled to the second output of MCU unit, an input being coupled to not circuit output, and one for exporting the output of this first pwm signal;
Second AND circuit, comprises the input that two are respectively coupled to first and second output of MCU unit, and one for exporting the output of this second pwm signal.
4. the DC motor control circuit according to Claims 2 or 3, is characterized in that: described driver element comprises,
H-bridge drive circuit, is coupled to motor;
First control part, has one and receives the input of a DIR signal, and an output being coupled to one of them switching device of brachium pontis on described H bridge;
Second control part, has one and receives the input of the 2nd DIR signal, and an output being coupled to wherein another switching device of brachium pontis on described H bridge;
Under described H bridge, two switching devices of brachium pontis are respectively used to receive this first pwm signal and this second pwm signal.
5. DC motor control circuit according to claim 4, is characterized in that: described Overvoltage protecting unit comprises,
Partial pressure unit, has the input that two are respectively coupled to VCC end and GND end, and foundation VCC voltage exports this pressure measurement signal that an amplitude is less than this VCC voltage;
Voltage regulation unit, is coupled to described partial pressure unit, makes this pressure measurement signal keep stablizing and exporting described MCU unit to.
6. DC motor control circuit according to claim 5, is characterized in that: on described H bridge, the common port of brachium pontis and VCC are coupled with insurance resistance between holding.
7. DC motor control circuit according to claim 6, is characterized in that: an input of described partial pressure unit is held by described insurance resistance and VCC and coupled.
8. DC motor control circuit according to claim 4, is characterized in that: also comprise,
Over-current protecting unit, is coupled to driver element, to detect the operating current of driver element, and exports an over-current signal when this operating current is greater than a reference value to control unit.
9. DC motor control circuit according to claim 8, is characterized in that: under described H bridge, the common port of brachium pontis and GND are coupled with sampling resistor between holding,
Described over-current protecting unit detects the operating current of driver element by described sampling resistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520827996.3U CN205123638U (en) | 2015-10-24 | 2015-10-24 | DC motor controlling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520827996.3U CN205123638U (en) | 2015-10-24 | 2015-10-24 | DC motor controlling circuit |
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| CN205123638U true CN205123638U (en) | 2016-03-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508260A (en) * | 2017-09-01 | 2017-12-22 | 北京机械设备研究所 | A kind of DC motor control circuit based on excessively stream automatic shutoff |
| CN107544527A (en) * | 2017-10-23 | 2018-01-05 | 西北工业大学 | A kind of propeller rotating speed steering control device for small-scale underwater vehicle device |
| CN108092303A (en) * | 2017-12-05 | 2018-05-29 | 东南大学 | A kind of fault tolerant control method and system of wind generator system back-to-back converter |
| CN109639212A (en) * | 2018-11-22 | 2019-04-16 | 深圳市优必选科技有限公司 | Steering engine governor circuit and helm gear |
| TWI719930B (en) * | 2020-09-10 | 2021-02-21 | 致新科技股份有限公司 | Overvoltage protection circuit |
| CN113630048A (en) * | 2021-09-03 | 2021-11-09 | 青岛鼎信通讯股份有限公司 | Direct current motor control circuit based on super capacitor drive |
-
2015
- 2015-10-24 CN CN201520827996.3U patent/CN205123638U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508260A (en) * | 2017-09-01 | 2017-12-22 | 北京机械设备研究所 | A kind of DC motor control circuit based on excessively stream automatic shutoff |
| CN107544527A (en) * | 2017-10-23 | 2018-01-05 | 西北工业大学 | A kind of propeller rotating speed steering control device for small-scale underwater vehicle device |
| CN107544527B (en) * | 2017-10-23 | 2020-07-14 | 西北工业大学 | Propeller rotating speed steering control device for small underwater vehicle |
| CN108092303A (en) * | 2017-12-05 | 2018-05-29 | 东南大学 | A kind of fault tolerant control method and system of wind generator system back-to-back converter |
| CN108092303B (en) * | 2017-12-05 | 2019-10-11 | 东南大学 | A kind of fault tolerant control method and system of wind generator system back-to-back converter |
| CN109639212A (en) * | 2018-11-22 | 2019-04-16 | 深圳市优必选科技有限公司 | Steering engine governor circuit and helm gear |
| TWI719930B (en) * | 2020-09-10 | 2021-02-21 | 致新科技股份有限公司 | Overvoltage protection circuit |
| CN113630048A (en) * | 2021-09-03 | 2021-11-09 | 青岛鼎信通讯股份有限公司 | Direct current motor control circuit based on super capacitor drive |
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