CN101295919A - Large-current high-resolution driving circuit - Google Patents
Large-current high-resolution driving circuit Download PDFInfo
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- CN101295919A CN101295919A CNA2007100976837A CN200710097683A CN101295919A CN 101295919 A CN101295919 A CN 101295919A CN A2007100976837 A CNA2007100976837 A CN A2007100976837A CN 200710097683 A CN200710097683 A CN 200710097683A CN 101295919 A CN101295919 A CN 101295919A
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Abstract
The invention discloses a driving circuit with big current and high resolution, which comprises a control unit, a digital-to-analog converter and a voltage-to-current converting unit; the control unit receives a control signal used for operating a load and outputs a digital signal corresponding to the control signal; the digital-to-analog converter generates an analog voltage signal corresponding to the digital signal; while the voltage-to-current converting unit generates a current signal corresponding to the analog voltage signal and sends the current signals to the load for carrying out driving.
Description
Technical field
The invention relates to a kind of drive circuit of large-current high-resolution, particularly relevant for a kind of drive circuit of integrating the numerical digit analogy converter.
Background technology
See also Fig. 1, it is the schematic diagram that illustrates the big current driving circuit of prior art.Among the figure, drive circuit is to comprise an operational amplifier (OP) 11 and an electric current and voltage converting unit 12.One input of operational amplifier 11 is to receive a control voltage signal Vc, and the output of another input concatenation operation amplifier 11, to form a back coupling framework.The output of electric current and voltage converting unit 12 concatenation operation amplifiers 11, and produce a current signal 121 according to the output voltage of operational amplifier 11, be used for driving load 13, for example motor, loudspeaker or CD-ROM device.Because the drive circuit of prior art is to use OP to amplify signal, and OP is an analogy element, therefore be subjected to the interference of noise easily, cause the proportionate relationship between its output voltage and the control voltage signal to be not easy accurate control, just can't drive load and carry out trickle action, as rotating speed control or mobile.
Because every problem of prior art, in order to take into account solutions, the inventor proposes a kind of drive circuit of large-current high-resolution, with implementation and the foundation as the above-mentioned shortcoming of improvement based on research and development and many practical experience for many years.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of drive circuit of large-current high-resolution is being provided, to improve the control efficiency to load.
According to purpose of the present invention, the drive circuit that proposes a kind of large-current high-resolution drives a load to produce a current signal, and this drive circuit comprises a control unit, a numerical digit analogy unit and an electric current and voltage converting unit.Control unit is to receive one in order to operating the controlling signal of this load, and exports the digital signals of a corresponding controlling signal, and the numerical digit analogy converter is in order to produce the analog voltage signal of corresponding this digital signals.The electric current and voltage converting unit is to produce the current signal of a corresponding analog voltage signal and be sent to load.
In addition, the present invention more proposes a kind of drive circuit that is applicable to motor, and it comprises a control unit, a numerical digit analogy converting unit and a driver element.Control unit is to receive a controlling signal in order to the operation motor, and exports the digital signals of corresponding this controlling signal.Numerical digit analogy converting unit is the analog voltage signal that produces a corresponding digital signals, and driver element is to produce the driving signal of a corresponding analog voltage signal and be sent to motor.
Wherein, if this motor is a stepper motor, and driver element comprises a PWM signal generating circuit, to produce the PWM signal of the approximate equal proportion of a work period width (or pulse duration) and analog voltage signal.If this motor is a linear DC motor, and driver element is to comprise an electric current and voltage converting unit, with produce one with the current signal of the approximate equal proportion of analog voltage signal.
The invention has the beneficial effects as follows: the drive circuit according to large-current high-resolution of the present invention has the following advantages:
(1) drive circuit of this large-current high-resolution can produce the current signal of high-res, and therefore can drive load carries out trimming movement.
(2) drive circuit of this large-current high-resolution is to use the numerical digit analogous circuit, therefore can reduce the interference of noise.
Description of drawings
Fig. 1 is the schematic diagram of the big current driving circuit of prior art;
Fig. 2 is the calcspar of the drive circuit of large-current high-resolution of the present invention;
Fig. 3 is the schematic diagram of embodiment of the drive circuit of large-current high-resolution of the present invention; And
Fig. 4 is the schematic diagram of the embodiment of the drive circuit of the large-current high-resolution that is applicable to stepper motor of the present invention.
The figure number explanation
11: operational amplifier; 12: the electric current and voltage converting unit;
121: current signal; 13: load;
2: drive circuit; 21: load;
22: control unit; 222: digital signals;
22: control unit; 23: numerical digit analogy converting unit;
231: the analog voltage signal; 24: the electric current and voltage converting unit;
241: current signal; 3: drive circuit;
311: voice coil motor; 312: the camera lens module;
32: microcontroller; 321: control command;
322: digital signals; 323:I
2The C interface;
33: numerical digit analogy change-over circuit; 331: the analog voltage signal;
34: voltage-current converter circuit; 341: current signal;
35: compensating circuit; 4: drive circuit;
41: stepper motor; 42: microprocessor;
421: control command; 422: digital signals;
The 423:SPI interface; 43: numerical digit analogy change-over circuit;
431: the analog voltage signal; The 44:PWM signal generating circuit;
The 441:PWM signal; 45: compensating circuit.
Embodiment
Hereinafter with reference to relevant indicators, the drive circuit according to the large-current high-resolution of preferred embodiment of the present invention is described.
See also Fig. 2, it is the calcspar of the drive circuit of large-current high-resolution of the present invention.Among the figure, drive circuit 2 is in order to produce a current signal to drive a load 21, for example loudspeaker, a CD-ROM device, a stepper motor or a linear DC motor (Linear Direct Current Motor, LDM), as voice coil motor (Voice-Coil Motor, VCM) or the like.Drive circuit 2 comprises a control unit 22, a numerical digit analogy converting unit 23 and an electric current and voltage converting unit 24 at least.
Control unit 22 is to receive a controlling signal 221 in order to service load 21, and exports the digital signals 222 of a corresponding controlling signal 221.Wherein, control unit 22 can a microprocessor or a microcontroller realize.Controlling signal 221 is the instruction of service load 21, and for example, if load 21 is a voice coil motor, then control unit 22 can receive an instruction signal that moves voice coil motor to an ad-hoc location.Digital signals 222 comprises a plurality of two bit signals, and these a little two bit signals can be expressed as a numerical value.In addition, control unit 22 can be provided with multiple interface and receive instruction, for example (Inter-Integrated Circuit, I between integrated circuit
2C) interface, serial peripheral interface (Serial Peripheral Interface, SPI) interface or general asynchronous receiver transmitter (Universal AsynchronousReceiver-Transmitter, UART) interface.
(Digital-to-Analog Converter, DAC) 13 is to receive digital signals 222 to the numerical digit analogy converter, to produce the analog voltage signal 231 of a corresponding digital signals 222.Wherein, the magnitude of voltage of analog voltage signal 231 is that geometric ratio is in digital signals 222, for example, if numerical digit analogy converter 23 can receive 4 two bit signals, and the maximum voltage of its output is 3.2 volts (V), minimum voltage is 0 volt, numerical digit analogy converter 13 exportable 16 kinds of magnitudes of voltage (0V, 0.2V, 0.4V, 0.6V-2.8V, 3.0V, 3.2V) then, approximate 0.2 volt of the difference of adjacent magnitude of voltage.Wherein, numerical digit analogy converter 23 is a numerical digit analogy change-over circuit, for example a condenser type numerical digit analogy change-over circuit, a resistance-type numerical digit analogy change-over circuit or a current type numerical digit analogy change-over circuit.In addition, drive circuit optionally can comprise a compensating circuit, and it connects numerical digit analogy change-over circuit, to improve the matching degree between the element (as electric capacity, resistance or electric crystal) in the numerical digit analogy change-over circuit, to improve the precision of numerical digit analogy change-over circuit.For example if numerical digit analogy converter 23 is a condenser type numerical digit analogy change-over circuit, then compensating circuit can improve the degree accurate in scale between the different electric capacity.
Electric current and voltage converting unit 24 is to receive analog voltage signal 231, and produces the current signal 241 of a corresponding analog voltage signal 231, and is sent to load 21.Wherein, current signal 241 is the big electric current greater than 1 milliampere, and current signal 241 has high linearity relation with digital signals 222, is current signal 241 approximate equal proportions (approximately proportional) in the numerical value of digital signals 222.Electric current and voltage converting unit 24 can realize by at least one electric crystal, for example is suitable for the power electric crystal of big electric current output.
One principal character of drive circuit of the present invention is that the current signal of exportable high-res gives load 21, to reach the effect that load is accurately controlled.With the voice coil motor is example, voice coil motor is a kind of linear DC motor, the thrust of its generation is directly proportional with the electric current of the magnet coiling of flowing through, if the drive circuit with use 10 bit DAC of the present invention is used for driving a voice coil motor, then drive circuit can produce 1024 kinds of different current signals and drive voice coil motor to produce 1024 kinds of different thrusts.Therefore as if the condenser lens that promotes video camera with this voice coil motor, then fine-tuning condenser lens is to reach better focusing effect.In addition, numerical digit analogy converter 23 is compared with analogy running amplifier, more is not vulnerable to the interference of noise, and therefore the analog signal accuracy of being exported is higher.
In addition, if load is a stepper motor, then drive circuit 2 can comprise a pulse width modulation (Pulse Width Modulation, PWM) circuit, it produces a pair of P WM signal that should current signal and gives stepper motor, and promptly the approximate equal proportion of the work period width (or pulse duration) of PWM signal is in the size of current signal.
See also Fig. 3, it is the schematic diagram of embodiment of the drive circuit of large-current high-resolution of the present invention.Among the figure, drive circuit 3 is in order to the voice coil motor in the drives camera 311, and it can promote camera lens module 312 to focus.Drive circuit 3 comprises a microcontroller 32, a numerical digit analogy change-over circuit 33, a compensating circuit 35 and a voltage-current converter circuit 34.Microcontroller 32 is to see through an I
2C interface 323 receives an operational order 321, and exports a digital signals 322 to numerical digit analogy change-over circuit 33 according to operational order 321.Numerical digit analogy change-over circuit 33 is exported an analog voltage signal 331 to voltage-current converter circuit 34 according to digital signals 322 two included bit signals, with produce one with the current signal 341 of the approximate equal proportions of analog voltage signal 331.Current signal 341 is to promote camera lens module 312 in order to drive voice coil motor 311.Compensating circuit 35 can improve the element matching degree of numerical digit analogy change-over circuit 33, with the accuracy of further raising analog voltage signal 331.
In this embodiment, suppose that numerical digit analogy change-over circuit 33 exportable maximum kinds are V H and exportable infima species is VL than voltage signal than voltage signal, it can drive voice coil motor 311 respectively camera lens module 312 is pushed into highest distance position P1 and proximal most position P2.When numerical digit analogy change-over circuit 33 is one 5 bit numerical digit analogy change-over circuits, represent its exportable 32 different analog voltage signals between VH and VL, therefore voice coil motor 311 can be pushed into camera lens module 312 32 diverse locations between position P1 and the position P2, similarly, if numerical digit analogy change-over circuit 33 is one 12 bit numerical digit analogy change-over circuits, then camera lens module 312 can be pushed to 4096 diverse locations between position P1 and the position P2, cause camera lens module 312 adjustable amplitudes meticulousr, then the camera lens focusing just can be more accurate.
See also Fig. 4, it is the schematic diagram of the embodiment of the drive circuit of the large-current high-resolution that is applicable to stepper motor of the present invention.Among the figure, drive circuit 4 is in order to driving a stepper motor 41, and drive circuit 4 comprises a microprocessor 42, a numerical digit analogy change-over circuit 43, a compensating circuit 45 and a PWM signal generating circuit 44.Microprocessor 42 sees through a SPI interface 423 and receives an operational order 421, and exports a digital signals 422 to numerical digit analogy change-over circuit 43 according to the content of operational order 421.Numerical digit analogy change-over circuit 43 is exported an analog voltage signal 431 to PWM signal generating circuits 44 according to digital signals 422 two included bit signals, to produce the PWM signal 441 of a work period (duty cycle) width (or pulse duration) and analog voltage signal 331 approximate equal proportions, it is in order to drive stepper motor 41.Because the rotating speed of stepper motor 41 is that the width with work period of PWM signal 441 is relevant, so the user can instruction mode accurately sets the speed revolution value of stepper motor 41, carries out trickle control.Compensating circuit 45 can improve the element matching degree of numerical digit analogy change-over circuit 43, with the accuracy of further raising analog voltage signal 431.
The above only is an illustrative, but not is restricted person.Press, allly be familiar with this technology personage,, do not break away from spirit of the present invention and category any, and, all should be contained in the claim scope of the present invention its equivalent modifications of carrying out or change according to the disclosed technology contents of the present invention.
Claims (9)
1, a kind of drive circuit of large-current high-resolution in order to produce a current signal to drive a load, is characterized in that it comprises:
One control unit is to receive one in order to operating the controlling signal of this load, and exports a pair of digital signals that should controlling signal;
One numerical digit analogy converter is to produce a pair of analog voltage signal that should digital signals; And
One electric current and voltage converting unit, be produce a pair of should the analog voltage signal current signal and be sent to this load.
2, drive circuit as claimed in claim 1 is characterized in that, this load is a motor, a CD-ROM device or loudspeaker.
3, drive circuit as claimed in claim 1 is characterized in that, this digital signals and this current signal have high linearity relation.
4, drive circuit as claimed in claim 1 is characterized in that, this current signal is to be higher than 1 milliampere.
5, drive circuit as claimed in claim 1 is characterized in that, more comprises a pulse width modulation signal generating circuit, is to produce a pair of PWM signal that should current signal to give this load.
6, a kind of drive circuit of large-current high-resolution is applicable to a motor, it is characterized in that, this drive circuit comprises:
One control unit is to receive one in order to operating the controlling signal of this motor, and exports a pair of digital signals that should controlling signal;
One numerical digit analogy converting unit is to produce a pair of analog voltage signal that should digital signals; And
One driver element, be produce a pair of should the analog voltage signal the driving signal and be sent to this motor.
7, drive circuit as claimed in claim 6 is characterized in that, this motor is a stepper motor, and this driver element comprises a PWM signal generating circuit, to produce the PWM signal of the approximate equal proportion of a work period width and this analogy voltage signal.
8, drive circuit as claimed in claim 6 is characterized in that, this motor is a linear DC motor, and this driver element comprises an electric current and voltage converting unit, with produce one with the current signal of the approximate equal proportion of this analogy voltage signal.
9, drive circuit as claimed in claim 8 is characterized in that, this current signal is to be higher than 1 milliampere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100976837A CN101295919A (en) | 2007-04-28 | 2007-04-28 | Large-current high-resolution driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100976837A CN101295919A (en) | 2007-04-28 | 2007-04-28 | Large-current high-resolution driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101295919A true CN101295919A (en) | 2008-10-29 |
Family
ID=40066002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100976837A Pending CN101295919A (en) | 2007-04-28 | 2007-04-28 | Large-current high-resolution driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101295919A (en) |
-
2007
- 2007-04-28 CN CNA2007100976837A patent/CN101295919A/en active Pending
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Open date: 20081029 |