CN105321258A - Commutator driving circuit and commutator driving method - Google Patents
Commutator driving circuit and commutator driving method Download PDFInfo
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- CN105321258A CN105321258A CN201510742574.0A CN201510742574A CN105321258A CN 105321258 A CN105321258 A CN 105321258A CN 201510742574 A CN201510742574 A CN 201510742574A CN 105321258 A CN105321258 A CN 105321258A
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Abstract
The invention discloses a commutator driving circuit and a commutator driving method. The method comprises: an MCU controller receiving a control command, and generating a periodic square wave control signal having a high level time width of T1; a protection circuit employing the periodic square wave control signal as the control input signal of a monostable multivibrator, the monostable multivibrator outputting a square wave pulse signal having a high level time width of T2, and performing AND gate logic operation on the periodic square wave control signal and the square wave pulse signal to output a pulse control signal; and a driving circuit employing the pulse control signal as a logic starting input signal to drive a commutator to work. When an outputted periodic square wave control signal is changed into a high level signal caused by abnormality of the MCU controller, the protection circuit outputs the pulse control signal, allowing the commutator to work at most for the high level time length of the pulse control signal, and thereby ensuring safe and reliable work of the commutator.
Description
Technical field
The present invention relates to commutator field, particularly relate to commutator driving circuit and commutator driving method.
Background technology
Automated teller machine has usually with lower unit: and carry out unit of handling up that bank note gives and accepts between client, currency examine unit that Currency Type and the true and false of the bank note dropped into are differentiated, temporarily retain input by bank note temporary storage location and preserve the paper money case of bank note by Currency Type.Unit is connected by paper money transmission channel, and realizes the switching in paper currency transmission direction by commutator.Such as, after currency examine unit is differentiated the bank note that unit transmission of handling up comes, genuine note then transfers to temporary storage location, unrecognizable bank note then returns unit of handling up, therefore the paper money transmission channel between currency examine unit, paper-money take-in send-out unit and temporary storage location is provided with commutator, this commutator switches by the transmission direction of bank note, makes the bank note of discharging from currency examine unit switch to temporary storage location or unit of handling up.The concrete structure of this commutator can refer to prior art, does not elaborate at this.
Commutator is not suitable for long-time energising, because after long-time energising, Inside coil can generate heat and causes coil short and blow, thus causes unforeseen peril to occur, and needs a kind of commutator driver module that commutator can be protected not to be burned.
Summary of the invention
The invention provides commutator driving circuit and commutator driving method, the work that energy available energy protection commutator is safe and reliable.
The invention provides a kind of commutator driving circuit, comprising: protection circuit, driving circuit, MCU controller;
Described MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1;
Described protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that described one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal;
Described driving circuit starts input signal using described pulse control signal as logic, drives commutator work.
Wherein, also comprise and connect the crystal oscillator of MCU controller for control system clock, described MCU controller is the single-chip microcomputer of STM32 series.
Wherein, described protection circuit comprises described one shot multivibrator, described and door, resistance R1, resistance R2, electric capacity C1, electric capacity C3;
Described one shot multivibrator adopts the integrated chip U1 of SN74AHCT123 series, the described chip U2 adopting SN74HCT08 type with door;
1st pin of described integrated chip U1 and the equal ground connection of the 14th pin, 2nd pin of integrated chip U1 connects the output terminal of output periodic square wave control signal and the first input end of chip U2 of MCU controller respectively, the 15th pin one end of contact resistance R1 and one end of electric capacity C1 respectively of integrated chip U1, another termination+3.3V voltage end of resistance R1, the other end ground connection of electric capacity C1, one end of the 3rd pin contact resistance R2 of integrated chip U1, another termination+3.3V voltage end of resistance R2, 13rd pin of integrated chip U1 connects second input end of chip U2, 16th pin of integrated chip U1 connects one end and the+3.3V voltage end of electric capacity C3 respectively, 8th pin of integrated chip U1 connects the other end and the ground of electric capacity C3 respectively.
Wherein, described driving circuit comprises the driving chip U5 of DRV8800 type;
3rd pin of described driving chip U5 connects the output terminal of the output periodic square wave control signal of MCU controller, 6th pin of driving chip U5 connects the output terminal of chip U2,9th pin of driving chip U5 connects power power-supply, and the 7th pin of driving chip U5 is all connected commutator with the 10th pin.
Wherein, also comprise communication interface, described communication interface is serial ports, and the level transferring chip of described serial ports adopts MAX3232 chip.
Wherein, also comprise communication interface, described communication interface is CAN mouth, and described CAN mouth comprises: the filtering circuit of transformer, transformer inputs, the filtering circuit of transformer output terminal, signal transceiver;
Described transformer adopts the chip U3 of LDO-05R05LS type, and described signal transceiver adopts the chip U4 of ISO1050 type;
1st pin of described chip U3 connects the high level output end of the filtering circuit of chip U3 input end, 2nd pin of chip U3 connects the ground connection output terminal of the filtering circuit of chip U3 input end, the high level input end of the filtering circuit of described input end connects+5V power supply, the ground connection input end grounding of the filtering circuit of described input end, 6th pin of described chip U3 connects the high level input end of the filtering circuit of chip U3 output terminal, 4th pin of described chip U3 connects the ground connection input end of the filtering circuit of chip U3 output terminal, the high level output end of the filtering circuit of described output terminal connects the 8th pin of chip U4, the ground connection output terminal of the filtering circuit of described output terminal connects the 5th pin of chip U4,
1st pin of described chip U4 connects+3.3V power supply, and the 2nd pin of chip U4 is connected the input end of MCU controller with the 3rd pin, the 4th pin of chip U4 and the equal ground connection of the 5th pin, the 6th pin of chip U4 is all connected CAN interface with the 7th pin.
Wherein, also comprise and carry out the logic power of powering to described commutator driving circuit, the voltage range of described logic power is+5V ~+25V.
Wherein, described logic power adopts LM22676 type switching power source chip to change power supply before powering to described commutator driving circuit, exports and is used for+3.3V the power supply of power logic circuitry each in commutator driving circuit with for+5V power supply of powering to CAN communication circuit.
Wherein, also comprise for the power power-supply of drive circuitry, the voltage range of described power power-supply is+18V ~+25V.
The invention provides a kind of commutator driving method, comprising:
MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1;
Protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal;
Driving circuit starts input signal using described pulse control signal as logic, drives commutator work.
Beneficial effect of the present invention is: commutator driving circuit of the present invention, comprising: protection circuit, driving circuit, MCU controller; Described MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1; Described protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal; Described driving circuit starts input signal using described pulse control signal as logic, drives commutator work.Compared with prior art; the periodic square wave control signal that MCU controller exports by protection circuit is as input signal; export pulse control signal; when the work of MCU controller is abnormal cause export periodic square wave control signal become high level signal time; it is the square-wave pulse signal of T2 that protection circuit only exports a high level time width; making the working time of commutator the longest is T2, thus the work that protection commutator is safe and reliable.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing the embodiment of the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the content of the embodiment of the present invention and these accompanying drawings.
Fig. 1 is the structural drawing of commutator driving circuit of the present invention.
Fig. 2 is the circuit diagram of the protection circuit of commutator driving circuit of the present invention.
Fig. 3 is the circuit diagram of the driving circuit of commutator driving circuit of the present invention.
Fig. 4 is the CAN mouth circuit diagram of commutator driving circuit of the present invention.
Fig. 5 is the method flow diagram of commutator driving method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 is the structural drawing of commutator driving circuit of the present invention.Described commutator driving circuit, comprising: protection circuit, driving circuit, MCU controller; Also comprise: communication interface, crystal oscillator, logic power, power power-supply, commutator interface.
Concrete, described MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1; Preferably, MCU controller is the single-chip microcomputer of STM32 series, and the single-chip microcomputer energy consumption of STM series is low, startup is rapid.
Concrete, described protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal; Protection circuit comprises described one shot multivibrator, described and door, resistance R1, resistance R2, electric capacity C1, electric capacity C3; Preferably, one shot multivibrator adopts the integrated chip U1 of SN74AHCT123 series, the described chip U2 adopting SN74HCT08 type with door.
The circuit diagram of protection circuit as shown in Figure 2, 1st pin of described integrated chip U1 and the equal ground connection of the 14th pin, 2nd pin of integrated chip U1 connects the output terminal of the output periodic square wave control signal of MCU controller respectively, the first input end of chip U2, one end of the 15th pin difference contact resistance R1 of integrated chip U1, one end of electric capacity C1, another termination+3.3V voltage end of resistance R1, the other end ground connection of electric capacity C1, one end of the 3rd pin contact resistance R2 of integrated chip U1, another termination+3.3V voltage end of resistance R2, 13rd pin of integrated chip U1 connects second input end of chip U2, 16th pin of integrated chip U1 connects one end of electric capacity C3 respectively, + 3.3V voltage end, 8th pin of integrated chip U1 connects the other end of electric capacity C3 respectively, ground.
Wherein, the periodic square wave control signal that MCU controller exports is as the input signal of U1 in protection circuit; U1 exports pulse control signal, and the pulse control signal that U1 exports is relevant with the periodic square wave control signal that resistance R1, electric capacity C1 and MCU controller export.According to the characteristic with reference to one shot multivibrator in regular book, the square-wave pulse signal that high level time width T2 is different can be obtained as required; Preferably, when MCU controller normally works, T2 is adjusted to identical with T1, and when the work of MCU controller is abnormal cause export periodic square wave control signal become high level signal time, it is the square-wave pulse signal of T2 that protection circuit only exports a high level time width, making the working time of commutator the longest is T2, thus the work that protection commutator is safe and reliable, prevent commutator to be energized for a long time and burnt; And guard time T2 sets by resistance R1 and electric capacity C1, can accomplish to control conduction time accurately.
Described driving circuit starts input signal using described pulse control signal as logic, drives commutator work.
Concrete, as shown in Figure 3, described driving circuit adopts special driving chip: the driving chip of DRV8800 type, 3rd pin of described driving chip U5 connects the output terminal of the output periodic square wave control signal of MCU controller, 6th pin of driving chip U5 connects the output terminal of chip U2,9th pin of driving chip U5 connects power power-supply, and the 7th pin of driving chip U5 is all connected commutator with the 10th pin.The driving chip of DRV8800 type is special driving chip, adopts the driving chip of DRV8800 type to simplify driving circuit, effectively raises work efficiency.
Also comprise crystal oscillator in commutator driver module, as shown in Figure 1, described crystal oscillator is connected with MCU controller, the clock of the good control system of energy.
Commutator driving circuit also comprises communication interface, and the single-chip microcomputer of STM32 series carries serial ports and CAN mouth.The level transferring chip of described serial ports adopts MAX3232 chip; Described CAN mouth comprises: the filtering circuit of transformer, transformer inputs, the filtering circuit of transformer output terminal, signal transceiver.
Preferably, as shown in Figure 4, described transformer adopts the chip U3 of LDO-05R05LS type, and described signal transceiver adopts the chip U4 of ISO1050 type, 1st pin of described chip U3 connects the high level output end of the filtering circuit of chip U3 input end, 2nd pin of chip U3 connects the ground connection output terminal of the filtering circuit of chip U3 input end, the high level input end of the filtering circuit of described input end connects+5V power supply, the ground connection input end grounding of the filtering circuit of described input end, 6th pin of described chip U3 connects the high level input end of the filtering circuit of chip U3 output terminal, 4th pin of described chip U3 connects the ground connection input end of the filtering circuit of chip U3 output terminal, the high level output end of the filtering circuit of described output terminal connects the 8th pin of chip U4, the ground connection output terminal of the filtering circuit of described output terminal connects the 5th pin of chip U4, 1st pin of described chip U4 connects+3.3V power supply, and the 2nd pin of chip U4 is connected the input end of MCU controller with the 3rd pin, the 4th pin of chip U4 and the equal ground connection of the 5th pin, the 6th pin of chip U4 is all connected CAN mouth with the 7th pin.
Concrete, serial ports and CAN mouth belong to conventional communication interface, make this commutator driving circuit have good versatility, should use more flexible.
In addition, commutator driving circuit also comprises and carries out the logic power of powering to described commutator driving circuit and for the power power-supply of drive circuitry, the voltage range of described logic power is+5V ~+25V; Described logic power adopts LM22676 type switching power source chip to change power supply before powering to described commutator driving circuit, exports and is used for+3.3V the power supply of power logic circuitry each in commutator driving circuit with for+5V power supply of powering to CAN communication circuit; The voltage range of described power power-supply is+18V ~+25V.The scope of power supply input is comparatively large, the versatility that the system that increases uses and dirigibility.
In sum, the commutator driver module of the present invention's design independently can realize the control of commutator, commutator can be prevented to be energized for a long time burnt, guard time by hardware setting, and can also be accomplished accurately to control conduction time, and due to power supply input range large, communication interface--CAN communication agreement or serial communication protocol, realization is with more high-rise communication and communication interface meets working standard, has good versatility, should use also more flexible; In addition, major part adopts hardware controls, uses safe and reliable.
Fig. 5 is the method flow diagram of commutator driving method of the present invention.
Step S101, MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1.
In the present embodiment, MCU controller adopts the single-chip microcomputer of STM32 series, the CAN interface that MCU controller is carried by the single-chip microcomputer of STM32 series or serial ports receive the order of other more higher layer processor, produce the periodic square wave control signal that high level time width is T1, exported by the I/O mouth of STM32 chip.
Step S102; protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator; it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width; described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal.
In the present embodiment, protection circuit is primarily of one shot multivibrator and AND circuit composition, one shot multivibrator can select the integrated chip of SN74AHC123 series, SN74AHC123 and the protection circuit that forms with door SN74HCT08 are as shown in Figure 2, MCU controller generation high level time width is that the periodic square wave control signal of T1 is exported by the I/O mouth of STM32 chip, be introduced into the one shot multivibrator in protection circuit, it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width, and then by carrying out and gate logic computing with periodic square wave control signal described in goalkeeper and described square-wave pulse signal in protection circuit, export pulse control signal, and described pulse control signal is transferred to driving circuit.
Concrete, the one shot multivibrator in protection circuit often receives the periodic square wave control signal that a high level time width is T1, exports a square-wave pulse signal.Preferably, T1 in described periodic square wave control signal under normally being worked by MCU and the T2 in described square-wave pulse signal is adjusted to equal, thus under the normal duty of MCU, the periodic square wave control signal of the pulse control signal exported with door to be high level be T1/T2.When the work of MCU controller is abnormal cause export periodic square wave control signal become high level signal time; it is the square-wave pulse signal of T2 that one shot multivibrator only produces a high level time width; described periodic square wave control signal and described square-wave pulse signal being carried out obtaining a high level time width with gate logic computing is that the square-wave pulse signal of T2 is as pulse control signal; making the working time of commutator the longest is T2, thus the work that protection commutator is safe and reliable.
Step S103, driving circuit starts input signal using described pulse control signal as logic, drives commutator work.
Concrete, driving circuit starts input signal using described pulse control signal as logic, and driving circuit receives the direction controlling input signal that MCU controller exports simultaneously, thus drives commutator work.
In sum, the present invention receives control command by MCU controller, produces the periodic square wave control signal that high level time width is T1; Protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal; Driving circuit starts input signal using described pulse control signal as logic, drives commutator work.When the work of MCU controller is abnormal cause export periodic square wave control signal become high level signal time; protection circuit exports pulse control signal; make the time span of the high level of the maximum working pulse control signal of commutator, thus the work that protection commutator is safe and reliable.
Below know-why of the present invention is described in conjunction with specific embodiments.These describe just in order to explain principle of the present invention, and can not be interpreted as limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (10)
1. a commutator driving circuit, is characterized in that, comprising: protection circuit, driving circuit, MCU controller;
Described MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1;
Described protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that described one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal;
Described driving circuit starts input signal using described pulse control signal as logic, drives commutator work.
2. commutator driving circuit according to claim 1, is characterized in that, also comprise and connect the crystal oscillator of MCU controller for control system clock, described MCU controller is the single-chip microcomputer of STM32 series.
3. commutator driving circuit according to claim 2, is characterized in that, described protection circuit comprises described one shot multivibrator, described and door, resistance R1, resistance R2, electric capacity C1, electric capacity C3;
Described one shot multivibrator adopts the integrated chip U1 of SN74AHCT123 series, the described chip U2 adopting SN74HCT08 type with door;
1st pin of described integrated chip U1 and the equal ground connection of the 14th pin, 2nd pin of integrated chip U1 connects the output terminal of output periodic square wave control signal and the first input end of chip U2 of MCU controller respectively, the 15th pin one end of contact resistance R1 and one end of electric capacity C1 respectively of integrated chip U1, another termination+3.3V voltage end of resistance R1, the other end ground connection of electric capacity C1, one end of the 3rd pin contact resistance R2 of integrated chip U1, another termination+3.3V voltage end of resistance R2, 13rd pin of integrated chip U1 connects second input end of chip U2, 16th pin of integrated chip U1 connects one end and the+3.3V voltage end of electric capacity C3 respectively, 8th pin of integrated chip U1 connects the other end and the ground of electric capacity C3 respectively.
4. commutator driving circuit according to claim 2, is characterized in that, described driving circuit comprises the driving chip U5 of DRV8800 type;
3rd pin of described driving chip U5 connects the output terminal of the output periodic square wave control signal of MCU controller, 6th pin of driving chip U5 connects the output terminal of chip U2,9th pin of driving chip U5 connects power power-supply, and the 7th pin of driving chip U5 is all connected commutator with the 10th pin.
5. commutator driving circuit according to claim 2, is characterized in that, also comprise communication interface, and described communication interface is serial ports, and the level transferring chip of described serial ports adopts MAX3232 chip.
6. commutator driving circuit according to claim 2, it is characterized in that, also comprise communication interface, described communication interface is CAN mouth, and described CAN mouth comprises: the filtering circuit of transformer, transformer inputs, the filtering circuit of transformer output terminal, signal transceiver;
Described transformer adopts the chip U3 of LDO-05R05LS type, and described signal transceiver adopts the chip U4 of ISO1050 type;
1st pin of described chip U3 connects the high level output end of the filtering circuit of chip U3 input end, 2nd pin of chip U3 connects the ground connection output terminal of the filtering circuit of chip U3 input end, the high level input end of the filtering circuit of described input end connects+5V power supply, the ground connection input end grounding of the filtering circuit of described input end, 6th pin of described chip U3 connects the high level input end of the filtering circuit of chip U3 output terminal, 4th pin of described chip U3 connects the ground connection input end of the filtering circuit of chip U3 output terminal, the high level output end of the filtering circuit of described output terminal connects the 8th pin of chip U4, the ground connection output terminal of the filtering circuit of described output terminal connects the 5th pin of chip U4,
1st pin of described chip U4 connects+3.3V power supply, and the 2nd pin of chip U4 is connected the input end of MCU controller with the 3rd pin, the 4th pin of chip U4 and the equal ground connection of the 5th pin, the 6th pin of chip U4 is all connected CAN interface with the 7th pin.
7. commutator driving circuit according to claim 1, is characterized in that, also comprise and carry out the logic power of powering to described commutator driving circuit, the voltage range of described logic power is+5V ~+25V.
8. commutator driving circuit according to claim 7, it is characterized in that, described logic power adopts LM22676 type switching power source chip to change power supply before powering to described commutator driving circuit, exports and is used for+3.3V the power supply of power logic circuitry each in commutator driving circuit with for+5V power supply of powering to CAN communication circuit.
9. commutator driving circuit according to claim 1, is characterized in that, also comprise for the power power-supply of drive circuitry, the voltage range of described power power-supply is+18V ~+25V.
10. a commutator driving method, is characterized in that, comprising:
MCU controller receives control command, produces the periodic square wave control signal that high level time width is T1;
Protection circuit is using the control inputs signal of described periodic square wave control signal as one shot multivibrator, it is the square-wave pulse signal of T2 that one shot multivibrator exports high level time width, described periodic square wave control signal and described square-wave pulse signal are carried out and gate logic computing, exports pulse control signal;
Driving circuit starts input signal using described pulse control signal as logic, drives commutator work.
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| CN201510742574.0A CN105321258A (en) | 2015-11-04 | 2015-11-04 | Commutator driving circuit and commutator driving method |
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| CN201510742574.0A CN105321258A (en) | 2015-11-04 | 2015-11-04 | Commutator driving circuit and commutator driving method |
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Application publication date: 20160210 |
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| RJ01 | Rejection of invention patent application after publication |