CN109309473B - Circuit for preventing common-mode conduction of brush motor - Google Patents
Circuit for preventing common-mode conduction of brush motor Download PDFInfo
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- CN109309473B CN109309473B CN201811389199.6A CN201811389199A CN109309473B CN 109309473 B CN109309473 B CN 109309473B CN 201811389199 A CN201811389199 A CN 201811389199A CN 109309473 B CN109309473 B CN 109309473B
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- 230000000295 complement effect Effects 0.000 claims abstract description 32
- 238000012545 processing Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000002265 prevention Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention provides a circuit for preventing common-mode conduction of a brush motor, and relates to the technical field of motor control. The first logic chip, the second logic chip, the third logic chip and the driving circuit for preventing the brush motor are electrically connected in sequence, the first logic chip is used for being electrically connected with a signal source so as to receive two pairs of complementary signals input by the signal source, the first logic chip is used for processing the signal source so as to generate reverse signals when the complementary signals are common-mode conduction signals, the second logic chip is used for carrying out reverse processing on the signals output by the signal source and transmitting the processed signals to the third logic chip, the driving circuit is also used for being electrically connected with the brush motor, and the driving circuit is used for controlling the brush motor to work when the third logic chip is in an enabling state. The common-mode conduction circuit for preventing the brush motor has the advantage of preventing the power tube from being burnt out under the common-mode conduction phenomenon.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a circuit for preventing common-mode conduction of a brush motor.
Background
With the development and application of intelligent equipment, a brush motor is used as a common electric execution unit and is increasingly and widely used. In daily hardware debugging, the phenomenon of common-mode conduction sometimes occurs due to improper circuit design or disordered software in the early stage, the quality of the device and the like, so that the power tube is burnt out.
In view of this, how to solve the above problems is an important point of attention of those skilled in the art.
Disclosure of Invention
The invention aims to provide a common-mode conduction circuit for preventing a brush motor from being burnt out, which solves the problem that a power tube is burnt out due to the common-mode conduction phenomenon of the brush motor in the use process in the prior art.
The invention also aims to provide an electronic device applying the circuit for preventing the common-mode conduction of the brush motor.
The invention is realized in the following way:
The embodiment of the utility model provides a prevent that there is a brush motor common-mode on circuit, prevent that there is a brush motor common-mode on circuit includes first logic chip, second logic chip, third logic chip and drive circuit, first logic chip, second logic chip, third logic chip and drive circuit are electric connection in proper order, first logic chip is used for being connected with a signal source electricity to receive two pairs of complementary signals that the signal source input, first logic chip is used for handling the signal source, in order to when complementary signal is common-mode on signal, generates reverse signal, second logic chip is used for carrying out reverse processing to the signal that the signal source output to with the signal transmission after handling to third logic chip, drive circuit is used for still being connected with a brush motor electricity, drive circuit is used for controlling when the third logic chip is in enabling state the work of brush motor;
Further, the circuit for preventing common-mode conduction of the brush motor further comprises a schottky diode assembly, and the first logic chip, the schottky diode assembly and the second logic chip are electrically connected in sequence.
Further, the first logic chip includes a first nand gate, a second nand gate, a third nand gate and a fourth nand gate, the input end of the first nand gate is connected with a first pair of complementary signals of the signal source, the input end of the second nand gate is connected with a second pair of complementary signals of the signal source, the input end of the third nand gate is grounded, the input end of the fourth nand gate is idle, and the output ends of the first nand gate, the second nand gate, the third nand gate and the fourth nand gate are all electrically connected with the schottky diode assembly.
Further, the schottky diode assembly includes a first diode, a second diode, a third diode and a fourth diode, the output end of the first nand gate is electrically connected with the cathode of the first diode, the output end of the second nand gate is electrically connected with the fourth diode, the output end of the third nand gate is electrically connected with the cathode of the third diode, the output end of the fourth nand gate is electrically connected with the cathode of the second diode, and the anodes of the first diode, the second diode, the third diode and the fourth diode are electrically connected with a power supply and the second logic chip respectively.
Further, the second logic chip includes a first not gate, an input end of the first not gate is electrically connected to anodes of the first diode, the second diode, the third diode and the fourth diode, and an output end of the first not gate is electrically connected to an enable end of the third logic chip.
Further, the circuit for preventing common-mode conduction of the brushed motor further comprises a warning unit, wherein the warning unit is electrically connected with the first logic chip and is used for warning when common-mode conduction signals appear in the two pairs of complementary signals.
Further, the warning unit comprises a second NOT gate, a resistor and a light emitting diode, wherein the input end of the second NOT gate is electrically connected with the output end of the first logic chip, and the output end of the second NOT gate is connected with the resistor and the light emitting diode in series and then grounded.
Further, the warning unit further comprises a capacitor, one end of the capacitor is electrically connected with the output end of the second NOT gate, and the other end of the capacitor is grounded.
Further, the model of the first logic chip comprises SN74HCT00PW, the model of the second logic chip comprises SN74LVC2G04DBVR, and the model of the third logic chip comprises SN74HCT245PWR.
Further, the third logic chip is configured to be in an enabled state when the enable terminal receives the low level signal, and is configured to be in a disabled state when the enable terminal receives the high level signal.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a common-mode conduction circuit for preventing a brushed motor, which comprises a first logic chip, a second logic chip, a third logic chip and a driving circuit, wherein the first logic chip, the second logic chip, the third logic chip and the driving circuit are sequentially and electrically connected, the first logic chip is used for being electrically connected with a signal source so as to receive two pairs of complementary signals input by the signal source, the first logic chip is used for processing the signal source so as to generate reverse signals when the complementary signals are common-mode conduction signals, the second logic chip is used for carrying out reverse processing on signals output by the signal source and transmitting the processed signals to the third logic chip, and the driving circuit is further used for being electrically connected with a brushed motor and controlling the brushed motor to work when the third logic chip is in an enabling state. When any pair of complementary signals in the signal source appear in the common-mode conduction signal, the first logic chip of the brush motor is subjected to reverse processing, and the second logic chip is subjected to reverse processing again when the brush motor is used, so that the enabling end of the third logic chip receives a forbidden signal, and the third logic chip is in an inactive state, and therefore the phenomenon that the common-mode conduction phenomenon is caused by the fact that two pairs of complementary signals directly pass through the third logic chip is avoided, and the power tube in the driving circuit is burnt out due to the fact that large current is output.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a schematic block diagram of a circuit for preventing common-mode conduction of a brushed motor according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram of a circuit for preventing common-mode conduction of a brushed motor according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a first logic chip and a second logic chip for preventing a common-mode conduction circuit of a brushed motor according to an embodiment of the present invention.
Fig. 4 shows a circuit diagram of a third logic chip according to an embodiment of the present invention.
Icon: 100-preventing a brush motor from common-mode conduction circuit; 110-a first logic chip; 120-a second logic chip; 130-a third logic chip; 140-a driving circuit; a 150-schottky diode assembly; 160-warning unit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
First embodiment
Referring to fig. 1, an embodiment of the present invention provides a circuit 100 for preventing common-mode conduction of a brushed motor, wherein the circuit 100 includes a first logic chip 110, a schottky diode assembly 150, a second logic chip 120, a third logic chip 130, and a driving circuit 140, and the first logic chip 110, the schottky diode assembly 150, the second logic chip 120, the third logic chip 130, and the driving circuit 140 are electrically connected in sequence.
In the present embodiment, the first logic chip 110 is of the type SN74HCT00PW, the second logic chip 120 is of the type SN74LVC2G04DBVR, and the third logic chip 130 is of the type SN74HCT245PWR. Of course, in other embodiments, logic chips of other signals may be used, and the present embodiment is not limited in any way. And, the first logic chip 110 is electrically connected to a signal source to receive two pairs of complementary signals input by the signal source, the first logic chip 110 is used for processing the signal source to generate a reverse signal when the complementary signals are common-mode conduction signals, the second logic chip 120 is used for performing reverse processing on signals output by the signal source and transmitting the processed signals to the third logic chip 130, meanwhile, the driving circuit 140 is also used for electrically connecting with a brush motor, the driving circuit 140 is used for controlling the brush motor to work when the third logic chip 130 is in an enabled state, and when the third logic chip 130 is in a disabled state, the driving circuit 140 does not work, so that the condition that the third logic chip 130 does not output large current to burn out a power tube in the driving circuit 140 when the common-mode conduction phenomenon occurs is avoided, and the power tube in the driving circuit 140 is further protected.
Specifically, in the present embodiment, for the same pair of complementary signals of the signal source, when both complementary signals are high-level signals, the common-state is the common-state, and when the third logic chip 130 works according to the common-state signal, a large current is generated, which may cause burning of the MOS transistor in the driving circuit 140. The first logic chip 110 provided in this embodiment includes a first nand gate, a second nand gate, a third nand gate, and a fourth nand gate, where an input end of the first nand gate is connected to a first pair of complementary signals of the signal source, an input end of the second nand gate is connected to a second pair of complementary signals of the signal source, an input end of the third nand gate is connected to a second pair of complementary signals of the signal source, and an input end of the fourth nand gate is idle, and output ends of the first nand gate, the second nand gate, the third nand gate, and the fourth nand gate are all electrically connected to the schottky diode assembly 150. Meanwhile, the complementary signals in this embodiment are complementary PWM signals.
When two signals in the pair of complementary signals are both high, the output end of the NAND gate outputs low level according to the principle of the NAND gate, and when any one of the two signals in the pair of complementary signals is a place, the two signals are processed by the NAND gate and then are not processed, and the output end of the NAND gate outputs high level.
Meanwhile, the low-level signal is still in a low-level state after passing through the Schottky diode assembly, and the high-level signal is still in a high-level state after passing through the Schottky diode assembly. The schottky diode assembly of the present embodiment is of the type BAS70-06, although other types may be used in other embodiments, and the present embodiment is not limited thereto.
Specifically, the schottky diode assembly 150 includes a first diode, a second diode, a third diode, and a fourth diode, the output terminal of the first nand gate is electrically connected to the cathode of the first diode, the output terminal of the second nand gate is electrically connected to the fourth diode, the output terminal of the third nand gate is electrically connected to the cathode of the third diode, the output terminal of the fourth nand gate is electrically connected to the cathode of the second diode, and the anodes of the first diode, the second diode, the third diode, and the fourth diode are electrically connected to a power source and the second logic chip 120, respectively.
Meanwhile, the second logic chip 120 includes a first not gate, the input end of the first not gate is electrically connected to the anodes of the first diode, the second diode, the third diode and the fourth diode, and the output end of the first not gate is electrically connected to the enable end of the third logic chip 130.
According to the working principle of the NOT gate, when the input end is a low-level signal, the output end is a high-level signal, and when the input end is a high-level signal, the output end is a low-level signal. In the present embodiment, the enable terminal of the third logic chip 130 is disabled at a high level and enabled at a low level. When the enable end receives the low level signal, the third logic chip 130 works normally and outputs current to make the driving circuit 140 work to drive the brush motor to work, and when the enable end receives the high level signal, the third logic chip 130 is in a non-working state, and at the moment, the third logic chip 130 does not output current to the driving circuit 140, so that the MOS tube of the driving circuit 140 is protected.
Further, in this embodiment, in order to enable a worker to know in time that the common-mode conduction occurs in the circuit, in this embodiment, the circuit 100 for preventing the brushed motor from being conducted in a common mode further includes a warning unit 160, where the warning unit 160 is electrically connected to the first logic chip 110, and the warning unit 160 is configured to warn when the common-mode conduction signal occurs in two pairs of complementary signals.
Specifically, the warning unit 160 includes a second not gate, a resistor, and a light emitting diode, the input end of the second not gate is electrically connected to the output end of the first logic chip 110, and the output end of the second not gate is connected to the resistor and the light emitting diode in series and then grounded. When the circuit is in a common-mode conduction state, current flows through the light-emitting diode, and the light-emitting diode is lightened at the moment, so that a worker can know the condition of the circuit and take corresponding measures.
Further, the warning unit 160 further includes a capacitor, one end of which is electrically connected to the output end of the second not gate, and the other end of which is grounded. The capacitor can play a role in filtering, and meanwhile, one end of the capacitor is connected with the fault port, so that fault information can be uploaded.
In summary, the present invention provides a common-mode on-state prevention circuit for a brushed motor, where the common-mode on-state prevention circuit includes a first logic chip, a second logic chip, a third logic chip, and a driving circuit, the first logic chip, the second logic chip, the third logic chip, and the driving circuit are electrically connected in sequence, the first logic chip is configured to be electrically connected to a signal source to receive two pairs of complementary signals input by the signal source, the first logic chip is configured to process the signal source, so as to generate a reverse signal when the complementary signals are common-mode on signals, the second logic chip is configured to perform a reverse process on a signal output by the signal source, and transmit the processed signal to the third logic chip, and the driving circuit is further configured to be electrically connected to a brushed motor, and the driving circuit is configured to control the brushed motor to operate when the third logic chip is in an enabled state. When any pair of complementary signals in the signal source appear in the common-mode conduction signal, the first logic chip of the brush motor is subjected to reverse processing, and the second logic chip is subjected to reverse processing again when the brush motor is used, so that the enabling end of the third logic chip receives a forbidden signal, and the third logic chip is in an inactive state, and therefore the phenomenon that the common-mode conduction phenomenon is caused by the fact that two pairs of complementary signals directly pass through the third logic chip is avoided, and the power tube in the driving circuit is burnt out due to the fact that large current is output.
In the description of the present invention, it should be noted that the terms "first," "second," "third," "fourth," and the like are used merely for distinguishing between descriptions and should not be construed as indicating or implying relative importance. The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The common-mode conduction preventing circuit for the brushed motor is characterized by comprising a first logic chip, a second logic chip, a third logic chip and a driving circuit, wherein the first logic chip, the second logic chip, the third logic chip and the driving circuit are sequentially and electrically connected, the first logic chip is used for being electrically connected with a signal source so as to receive two pairs of complementary signals input by the signal source, the first logic chip is used for processing the signal source so as to generate a reverse signal when the complementary signals are common-mode conduction signals, the second logic chip is used for carrying out reverse processing on signals output by the signal source and transmitting the processed signals to the third logic chip, and the driving circuit is also used for being electrically connected with the brushed motor and controlling the brushed motor to work when the third logic chip is in an enabling state; the third logic chip is a low-level enabling chip;
The circuit for preventing the brush motor from being in common-mode conduction further comprises a Schottky diode assembly, and the first logic chip, the Schottky diode assembly and the second logic chip are electrically connected in sequence;
The first logic chip comprises a first NAND gate, a second NAND gate, a third NAND gate and a fourth NAND gate, wherein the input end of the first NAND gate is connected with a first pair of complementary signals of a signal source, the input end of the second NAND gate is connected with a second pair of complementary signals of the signal source, the input end of the third NAND gate is grounded, the input end of the fourth NAND gate is unloaded, and the output ends of the first NAND gate, the second NAND gate, the third NAND gate and the fourth NAND gate are electrically connected with the Schottky diode component;
The Schottky diode assembly comprises a first diode, a second diode, a third diode and a fourth diode, wherein the output end of a first NAND gate is electrically connected with the cathode of the first diode, the output end of a second NAND gate is electrically connected with the cathode of the fourth diode, the output end of the third NAND gate is electrically connected with the cathode of the third diode, the output end of the fourth NAND gate is electrically connected with the cathode of the second diode, and the anodes of the first diode, the second diode, the third diode and the fourth diode are respectively electrically connected with a power supply and a second logic chip.
2. The circuit of claim 1, wherein the second logic chip comprises a first not gate, an input terminal of the first not gate is electrically connected to anodes of the first diode, the second diode, the third diode, and the fourth diode, and an output terminal of the first not gate is electrically connected to an enable terminal of the third logic chip.
3. The brush motor common mode conduction prevention circuit according to claim 1, further comprising a warning unit electrically connected to the first logic chip, the warning unit being configured to warn when a common mode conduction signal occurs in the two pairs of complementary signals.
4. The circuit of claim 3, wherein the warning unit comprises a second NOT gate, a resistor and a light emitting diode, the input end of the second NOT gate is electrically connected with the output end of the first logic chip, and the output end of the second NOT gate is connected with the resistor and the light emitting diode in series and then grounded.
5. The circuit of claim 4, wherein the warning unit further comprises a capacitor, one end of the capacitor is electrically connected to the output end of the second NOT gate, and the other end of the capacitor is grounded.
6. The brush motor common mode turn-on prevention circuit of claim 1, wherein the model of the first logic chip comprises SN74HCT00PW, the model of the second logic chip comprises SN74LVC2G04DBVR, and the model of the third logic chip comprises SN74HCT245PWR.
7. The brush motor common mode prevention on circuit of claim 1, wherein the third logic chip is configured to be in an enabled state when the enable terminal receives the low level signal and to be in a disabled state when the enable terminal receives the high level signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389199.6A CN109309473B (en) | 2018-11-21 | 2018-11-21 | Circuit for preventing common-mode conduction of brush motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389199.6A CN109309473B (en) | 2018-11-21 | 2018-11-21 | Circuit for preventing common-mode conduction of brush motor |
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| CN109309473A CN109309473A (en) | 2019-02-05 |
| CN109309473B true CN109309473B (en) | 2024-06-21 |
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| CN201811389199.6A Active CN109309473B (en) | 2018-11-21 | 2018-11-21 | Circuit for preventing common-mode conduction of brush motor |
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| KR980011760A (en) * | 1996-07-30 | 1998-04-30 | 김광호 | Recipe input key control device of dispensing device |
| JPH10135807A (en) * | 1996-10-30 | 1998-05-22 | Nippon Inter Electronics Corp | Predriver circuit |
| CN105048794A (en) * | 2015-01-28 | 2015-11-11 | 南通昱品通信科技有限公司 | Insulated Gate Bipolar Transistor (IGBT) driver interlock circuit with power-on time delay function |
| CN208986864U (en) * | 2018-11-21 | 2019-06-14 | 广东嘉腾机器人自动化有限公司 | One kind preventing brush motor common conduct circuit |
Family Cites Families (4)
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| KR19990086881A (en) * | 1998-05-30 | 1999-12-15 | 이형도 | Arm short prevention circuit of inverter for motor |
| CN201160258Y (en) * | 2008-02-03 | 2008-12-03 | 天津电气传动设计研究所 | 3-power level integrated gate commutate thyristor frequency converter bridge arm straight-through protector |
| US8386980B2 (en) * | 2009-11-19 | 2013-02-26 | Duolog Research Limited | Integrated circuits design |
| CN106130436B (en) * | 2016-07-25 | 2018-07-27 | 合肥美的电冰箱有限公司 | Motor driver and refrigerator |
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2018
- 2018-11-21 CN CN201811389199.6A patent/CN109309473B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR980011760A (en) * | 1996-07-30 | 1998-04-30 | 김광호 | Recipe input key control device of dispensing device |
| JPH10135807A (en) * | 1996-10-30 | 1998-05-22 | Nippon Inter Electronics Corp | Predriver circuit |
| CN105048794A (en) * | 2015-01-28 | 2015-11-11 | 南通昱品通信科技有限公司 | Insulated Gate Bipolar Transistor (IGBT) driver interlock circuit with power-on time delay function |
| CN208986864U (en) * | 2018-11-21 | 2019-06-14 | 广东嘉腾机器人自动化有限公司 | One kind preventing brush motor common conduct circuit |
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