CN1093841A - Pulse-modulation step-by-step TV set driving power-supply - Google Patents
Pulse-modulation step-by-step TV set driving power-supply Download PDFInfo
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- CN1093841A CN1093841A CN 93110762 CN93110762A CN1093841A CN 1093841 A CN1093841 A CN 1093841A CN 93110762 CN93110762 CN 93110762 CN 93110762 A CN93110762 A CN 93110762A CN 1093841 A CN1093841 A CN 1093841A
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Abstract
A kind of pulse-modulation step-by-step TV set driving power-supply, it comprises that a stepping motor comprises a modulating pulse formation network with several motor drive modules identical with the stepping motor number of phases, in each group motor drive module, switching tube, a phase step motor coil and a continuous current circuit that constitutes by fly-wheel diode and continued flow resistance by modulating pulse control.It not only has the high characteristic of efficient, and has the output characteristic that is better than constant current chopper formula driving source for step motor and have the simple of series resistance formula driving power.
Description
The present invention relates to electronic circuit and relate more specifically to the driving power of pulse-modulation step-by-step TV set.
Main purpose of the present invention is for the step ground motor that is widely used in fields such as numerical control provides a kind of volume little, and is in light weight, efficient height, the simple high performance driving power of circuit.After stepping motor adopts driving power of the present invention, the transmission system performance of motor will greatly be improved.
At first, although the series resistance formula driving source for step motor that people adopt has the simple advantage of circuit, because the efficient of driving power is too low, high frequency performance difference and use day by day and reduce.Although height pressure type driving source for step motor upper limit operating frequency increases, efficient is also than series resistance formula driving power height; But, its control circuit complexity, and need the power supply of two kinds of different voltages to offer motor coil, thus influenced its development.Constant current chopper formula driving source for step motor is a kind of driving power of better performances, and its output current wave is better, and efficient is also very high., its peripheral control circuit is very complicated, and needs a plurality of power tubes around motor coil, has strengthened the driving difficulty of power switch pipe, and can't drive the stepping motor of common contact, thereby limited its range of application; In addition, in constant current chopper formula driving source for step motor, the magnitude of voltage that is charged to appointment when the electric current in the motor coil arrives up to cut-off signals near remaining on designated value later on always.Therefore, from the best effort loss of motor, the output characteristic of constant current chopper formula driving source for step motor does not reach optimum Working.
According to pulse-modulation step-by-step TV set driving power-supply provided by the present invention, it not only has the output characteristic that is better than constant current chopper formula driving source for step motor, and has the simple of series resistance formula driving power.
According to pulse-modulation step-by-step TV set driving power-supply provided by the present invention, it comprises: a stepping motor, several motor drive modules identical with the stepping motor number of phases, no matter stepping motor is a three-phase, still four phases or five phases, as long as be equipped with the motor drive module of phase equal number with it, just can make machine operation in optimum state, and irrelevant with the umber of beats of machine operation.
In each group motor drive module, comprising: a modulating pulse forms network, the switching tube by modulating pulse control, a phase step motor coil, a continuous current circuit that is made of fly-wheel diode and continued flow resistance.
In order to illustrate in greater detail the present invention and relevant advantage of the present invention, now get in touch the following accompanying drawing of appended description references.
Accompanying drawing 2. is the electrical schematic diagram of a certain group of driver module of pulse-modulation step-by-step TV set driving power-supply provided by the present invention.
Accompanying drawing 3. is the voltage waveform of the part of nodes in accompanying drawing 2 electrical schematic diagrams and the current waveform of motor coil.
A kind of embodiment of the present invention is that each phase input signal of control step motor coil break-make (is seen the A in the accompanying drawing 1, B, C, D and accompanying drawing 3-1) carry out logical conversion and processing, form one group of specific modulating pulse (seeing accompanying drawing 3-5), remove to trigger the power switch pipe that the control coil break-make uses with the specific modulating pulse of this group and just can make the current waveform that flows through motor coil reach required operating state.Pulse forming network is mainly by a multivibrator, a monostable circuit, and one two input NAND gate and one two input and door and some resistance and capacitor constitute.By C1, C2, R1, its output pulse width of multivibrator that R2 and U1 constitute can be realized by adjusting variable potentiometer R2.By C3, the output pulse width of the monostable circuit that R3 and U2A constitute can be realized by changing variable resistor R3.The output signal (seeing accompanying drawing 3-3) of the output pulse signal (seeing accompanying drawing 3-2) of multivibrator and monostable circuit is delivered to two inputs of NAND gate U3A respectively, just can obtain the set of pulses shown in accompanying drawing 3-4 at the output of U3A, with the signal of input pulse mutually of this group pulse and control step motor coil break-make deliver to respectively with the door U4 two inputs just can obtain required modulating pulse triggering signal (seeing accompanying drawing 3-5).
The another kind of embodiment of the present invention is to adopt the MOSFET pipe to make the switching tube Q1 of drive motors coil break-make, because it is high that the MOSFET pipe has gain, switching speed is fast, high-frequency loss is little, drive advantages such as simple and no secondary-breakdown phenomenon, make very high that the operating frequency of switching tube can do, thereby make milder that the electric current that flows through motor coil changes.Certainly, under situations such as stepping motor power is too big, adopt the switching tube of other type also passable, as long as mix suitable switching tube drive circuit.
The another kind of embodiment of the present invention is to have inherited series resistance formula driving source for step motor simple circuit configuration, promptly used single power switch pipe Q1 and coil power supply voltage V0.Different is the damping resistance of having cancelled highly energy-consuming; changed the very little measuring resistance R5 of impedance, therefore, its energy loss at work is minimum; and can under the situation that unexpected fault takes place, at first be smashed, thereby motor coil and switching tube all there is the certain protection effect.Met a pull down resistor R4 that impedance is higher between the grid of MOSFET pipe and power supply ground, it also has the certain protection effect to the MOSFET pipe.
The important embodiment of another kind of the present invention is continuous current circuit that is made of continued flow resistance R6 and sustained diode 1 all in parallel at the two ends of each phase motor coil.Wherein, the effect of fly-wheel diode is to have guaranteed to have only switching tube Q1 to turn-off the subsequent flows circuit just to work, and continued flow resistance then is to be used for limiting the size of freewheel current and the size of current value after the charge and discharge process balance in the control motor coil L 1.
Can know from accompanying drawing 3-5, first pulse that is applied on the switch controlled grid is produced by monostable circuit, it has long time of delay, and the power supply of motor charges to motor coil L 1 with regard to long time is arranged like this, up to first end-of-pulsing.Therefore,, promptly change the size of variable potentiometer R3 value, just can obtain a suitable coil current initial communication value as long as change the output pulse width of monostable circuit.If the upper limit operating frequency of stepping motor is higher, output pulse width that just can proper extension singlet circuit makes coil current initial communication value higher.Certainly, under the condition of the withstand voltage permission of motor coil, suitably improve the supply power voltage of motor, just can make the charging current rise time of motor coil shorter, faster, otherwise, then can suitably reduce the voltage supplied of motor, or dwindle the output pulse width of monostable circuit, make the electric current of motor coil rise milder.
After first modulating pulse finishes, the pulse signal that is produced by multi-harmonic-oscillations will constantly trigger and on-off switching tube Q1, and what kind of influence will it produce to the electric current in the stepping motor coil? experiment and theoretical all the proof along with the current value in the continuous increase motor coil that discharges and recharges pulse will tend to a stable current balance type value.If under the constant situation of motor supply power voltage value, the equilibrium valve size of electric current is only relevant by the pulse duration of continued flow resistance in the discharge loop and multivibrator output in the stepping motor coil.
Electrical theory points out that the speed that discharges and recharges of inductance is relevant with the time constant of its charging and discharging circuit, and the time constant of inductor loop equals L/R; And time constant is big more, and the speed that discharges and recharges is slow more, and vice versa.Therefore, under the constant situation of other condition, increase the resistance of continued flow resistance, promptly reduced time constant L/R, at this moment, the velocity of discharge of inductance is accelerated, and the current balance type value in the stepping motor coil is descended, and vice versa.If we guarantee under the constant situation of other condition, increase the width of all trigger impulses after second and second, even the charging interval is greater than discharge time, in essence, this just is equivalent to the time constant L/R that has increased inductor loop, charging interval is accelerated, thereby the current balance type value in the stepping motor coil is risen, vice versa, thus, after the stepping motor supply power voltage is decided,, just can make the current waveform that flows through in the stepping motor coil reach optimum state as long as suitably adjust multivibrator and the pulse duration of monostable circuit output and the size of continued flow resistance value.
Claims (14)
1, a kind of driving power of pulse-modulation step-by-step TV set, it comprises:
A stepping motor, several motor drive modules identical with the stepping motor number of phases, it is characterized in that no matter stepping motor is a three-phase, still four phases or five phases, as long as be equipped with the motor drive module of phase similar number with it, just can make the motor operate as normal, and irrelevant with the umber of beats of machine operation.
2, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1.It is characterized in that in each group motor drive module, comprising that a modulating pulse forms network, a switching tube, a phase step motor coil, a continuous current circuit that constitutes by fly-wheel diode and continued flow resistance by modulating pulse control.
3, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 or 2.It is characterized in that pulse forming network mainly by a multivibrator, a monostable circuit, one two input NAND gate and one two input and door and some resistance and capacitor constitute.
4, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1,2 or 3.The output pulse width that it is characterized in that multivibrator can be realized by changing variable potentiometer R2 value.
5, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 to 4.The output pulse width that it is characterized in that monostable circuit can be realized by changing variable resistor R3 value.
6, according to the pulse-modulation step-by-step TV set driving power-supply of claim 2 to 4.It is characterized in that the output signal of the output pulse signal of multivibrator and monostable circuit is delivered to respectively two inputs of NAND gate U3A, just can obtain a set of pulses at the output of U3A, with the signal of input pulse mutually of this group pulse and control step motor coil break-make deliver to respectively with the door U4A two inputs just can obtain required modulating pulse triggering signal at the output of U4A.
7, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 to 6.It is characterized in that only having adopted the switching tube Q1 of a unique MOSFET pipe as drive motors coil break-make.Because the MOSFET pipe has characteristics such as gain is high, and switching speed is fast, and high-frequency loss is little, make very high that the operating frequency of switching tube can do, thereby make very mild that the electric current that flows through motor coil changes.
8, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1,2 or 7.It is characterized in that using single stepping motor coil power supply voltage V0.Under the condition of the withstand voltage permission of motor coil, suitably improve the supply power voltage of motor, just can increase the upper limit operating frequency of motor.
9, according to claim 1,2,7 or 8 pulse-modulation step-by-step TV set driving power-supply.It is characterized in that cancelling the highly energy-consuming damping resistance of string in the motor coil loop, changed a measuring resistance R5 that impedance is very little, its energy loss at work is minimum.Met a pull down resistor R4 that impedance is higher between the grid of MOSFET pipe and power supply ground, it has the certain protection effect to the MOSFET pipe.
10, according to the pulse-modulation step-by-step TV set driving power-supply of claim 7,8 or 9.It is characterized in that in the equal parallel connection in the two ends of each phase motor coil a continuous current circuit that constitutes by continued flow resistance R5 and sustained diode 1.Wherein, fly-wheel diode has guaranteed to have only switching tube Q1 to turn-off the subsequent flows circuit and has just worked, and continued flow resistance then is to be used for limiting the size of freewheel current and the size of the current balance type value after the charge and discharge process balance in the control motor coil L 1.
11, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 to 10.Its feature also is after stepping motor supply power voltage V0 decides, as long as suitably adjust the output pulse width of multivibrator and the size of continued flow resistance value, just can make the current balance type value that flows through in the stepping motor coil reach designated state.
12, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 to 11.It is characterized in that as long as suitably adjust the output pulse width of monostable circuit, just can improve motor coil charging current speed, cooperate motor supply power voltage V0, suitably adjust the size of multivibrator output pulse width and continued flow resistance value, just can make the current waveform that flows through in the stepping motor coil reach optimum state.
13, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 to 12, the modulating pulse waveform that it is characterized in that the driving switch pipe is one group of specific pulse (as Fig. 3-5), wherein, first pulse broad, remaining is narrower, but frequency is higher.
14, according to the pulse-modulation step-by-step TV set driving power-supply of claim 1 to 13.It is characterized in that switching tube Q1 as drive motors coil break-make.Can adopt the switching tube of other type, as long as mix suitable switching tube drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110762 CN1093841A (en) | 1993-04-14 | 1993-04-14 | Pulse-modulation step-by-step TV set driving power-supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110762 CN1093841A (en) | 1993-04-14 | 1993-04-14 | Pulse-modulation step-by-step TV set driving power-supply |
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| Publication Number | Publication Date |
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| CN1093841A true CN1093841A (en) | 1994-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 93110762 Pending CN1093841A (en) | 1993-04-14 | 1993-04-14 | Pulse-modulation step-by-step TV set driving power-supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380414C (en) * | 2003-09-17 | 2008-04-09 | 阿鲁策株式会社 | Motor stop control device utilizable for gaming machine and gaming machine using the same |
| CN102739144A (en) * | 2012-06-29 | 2012-10-17 | 深圳市航盛电子股份有限公司 | Belt-starter generator (BSG) motor control system for micro hybrid vehicle |
| CN111682676A (en) * | 2020-06-01 | 2020-09-18 | 胡家华 | Motor and pulse motor system using same |
-
1993
- 1993-04-14 CN CN 93110762 patent/CN1093841A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380414C (en) * | 2003-09-17 | 2008-04-09 | 阿鲁策株式会社 | Motor stop control device utilizable for gaming machine and gaming machine using the same |
| CN102739144A (en) * | 2012-06-29 | 2012-10-17 | 深圳市航盛电子股份有限公司 | Belt-starter generator (BSG) motor control system for micro hybrid vehicle |
| CN111682676A (en) * | 2020-06-01 | 2020-09-18 | 胡家华 | Motor and pulse motor system using same |
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