CN103414349A - Servo driver power module and servo driver - Google Patents

Abstract

The invention provides a servo driver power module which comprises an input module used for inputting the direct-current voltage; a main winding, an MOS, a power supply winding located at the same side with the main winding, a plurality of output windings located at the different sides with the main winding, a PWM control chip and a triode. One end of the power supply winding is grounded and the other end of the power supply winding is connected to the main winding, a drain electrode of the MOS, a collector electrode of the triode and a voltage input end of the PWM control chip. An output end of the PWM control chip is connected to a base electrode of the MOS and the voltage input end of the PWM control chip is further connected with an emitting electrode of the triode. A source electrode of the triode is connected to the input module. According to the servo driver power module, the mode of two-circuit power supply is adopted by a control module composed of the PWM control chip and the MOS so that the control module still can control a circuit even though the input voltage is reduced or cut off.

Description

A kind of servo-driver power module and servo-driver

Technical field

The invention belongs to technical field of electricity, relate to a kind of servo-driver, particularly relate to a kind of servo-driver power module and servo-driver.

Background technology

Along with the development of power electronic technology, Control of AC Servo Drives reaches application widely.The future development that existing servo controller is little towards volume, function is many, densely arranged at the inner various circuit of servo controller, the anti-electromagnetic interference capability of servo controller types of functionality module has been proposed to new requirement.

The servo-driver power module is the important module that guarantees the servo-driver normal operation, if servo-driver power module output current generation disturbance makes other functional modules of whole servo-drive that disturbance all occurs, the servo-drive power module also can produce a large amount of electromagnetic interference simultaneously, affects the work of other functional modules.Therefore, to the servo-driver power module, need accomplish the requirement that electric current stable output and electromagnetic interference output reduce as far as possible.

Summary of the invention

The objective of the invention is to have the problems referred to above for existing technology, proposed a kind of electric current stable output, the less servo-driver power module of output electromagnetic interference.

Purpose of the present invention can realize by following technical proposal: a kind of servo-driver power module, and it comprises: for the input module of input direct voltage; Main winding, metal-oxide-semiconductor, with main winding be in the same side the power supply winding, with main winding, be in not a plurality of output windings, pwm chip, the triode of homonymy; The power supply winding one end ground connection other end is connected to main winding, metal-oxide-semiconductor drain electrode, transistor collector and pwm chip voltage input end; The pwm chip output is connected to the metal-oxide-semiconductor base stage, and voltage input end also is connected with transistor emitter; Triode source class access input module; During the direct voltage input, the increase of main winding magnetic flux makes output winding output dc voltage with to other module for power supply of servo-driver, thereby triode base emitter-base bandgap grading conducting simultaneously makes pwm chip with the ON time of regulating metal-oxide-semiconductor, to maintain the output voltage stabilization of output winding by regulating duty ratio; When DC input voitage reduced or disconnect, inferior winding magnetic flux made greatly the power supply winding produce induced current than power supply winding magnetic flux and supplies with pwm chip and metal-oxide-semiconductor, maintain pwm chip and metal-oxide-semiconductor in working order.

Further, also comprise metal-oxide-semiconductor drain voltage protection module, described metal-oxide-semiconductor drain voltage protection module and main winding are in parallel and connect with metal-oxide-semiconductor; Described metal-oxide-semiconductor drain voltage protection module comprises the first electric capacity, the first voltage stabilizing didoe, a plurality of the first resistance be connected in series, the first diode; After being connected in parallel, described the first electric capacity, the first voltage stabilizing didoe, the first resistance is connected in series with the first diode; The first voltage stabilizing didoe and the first diode cathode equipotential arrange, and the metal-oxide-semiconductor drain electrode is connected with the first diode cathode.

Further, also comprise filtration module, described filtration module is arranged between input module and main winding, described filtration module comprises three parallel branches, the first parallel branch consists of the second electric capacity, the second parallel branch consists of the first inductance and the second inductance, and the 3rd parallel branch consists of the 3rd resistance and the 4th resistance; Wire one end is arranged between the first inductance and the second inductance, and the other end is arranged between the 3rd resistance and the 4th resistance.

Further, the inductance value Lp of described main winding, peakflux density Bp, magnetic core air gap length L g, umber of turn Tp determine by following formula:

$\mathrm{Lp}=\frac{U^2{A}^2}{\mathrm{fP}}$

$\mathrm{Bp}=\frac{135\×\mathrm{Lp}}{I}$

$\mathrm{Tp}=\frac{U\×A}{f\×\mathrm{Bp}}$

$\mathrm{Lg}=\frac{3\mathrm{\π}\×T{p}^2\×\mathrm{Bp}}{\mathrm{Lp}}$

Wherein, U explains input voltage value, and A means the maximum duty cycle value of pwm chip, and P means input power, the switching frequency of f statement metal-oxide-semiconductor, and I explains input current.

Further, in described main winding, the width of single winding wire is 0.3 to 1.5 millimeter, and the gap between winding wire is the 0.2-0.5 millimeter.

Further, described the first resistance value is 20-70 ohm, and the first capacitance is 0.2 to 0.7 microfarad, the second capacitance is the 5-10 pico farad, and the 3rd resistance value is 100-200 ohm, and the 4th resistance value is 50-70 ohm, the first inductance value is the 0.5-1.5 milihenry, and the second inductance value is the 10-25 milihenry.

The present invention also provides a kind of servo-driver, and it comprises above-mentioned power module.

Compared with prior art, the present invention has following beneficial effect:

1, control module and the main winding of pwm chip and metal-oxide-semiconductor formation separate by triode, make main winding reduce the electromagnetic interference of control module;

2, the control module of pwm chip and metal-oxide-semiconductor formation adopts the pattern of duplex feeding, even make control module still can keep the control to circuit after input voltage reduces or disconnects;

3, paralleling MOS pipe drain voltage protection module on main winding, when the output winding produced the reverse induction electric current to main winding, this reverse induction electric current can be absorbed by metal-oxide-semiconductor drain voltage protection module, thus this reverse induction current affects metal-oxide-semiconductor anyway;

4, adopt the parameters of concrete formula design main winding, make that main winding operating efficiency possibility higher, that produce electromagnetic interference is less, power output is higher;

5, the parameters value in the specific design circuit, make that the circuit overall operation efficiency is higher, output voltage is more stable, Electro Magnetic Compatibility is better.

The accompanying drawing explanation

Fig. 1 is circuit theory schematic diagram of the present invention.

Fig. 2 is physical circuit schematic diagram of the present invention.

Embodiment

Be below specific embodiments of the invention by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiment.

As shown in Figure 1, servo-driver power module of the present invention, comprise input module 10 for input direct voltage, main winding 20, metal-oxide-semiconductor 30, with main winding be in the same side power supply winding 40, with main winding, be in not a plurality of output windings 50, pwm chip 60, the triode 70 of homonymy.

Main winding 20 access input modules 10, a plurality of output windings 50 and main winding 20 form transformer, for will after the input direct voltage transformation, exporting other modules of servo-driver to.

Power supply winding 40 is in the same side with main winding 20, power supply winding 40 1 end ground connection, and the other end is connected to main winding 20, metal-oxide-semiconductor 30 drain electrodes, triode 70 collector electrodes and pwm chip 60 voltage input ends.

Triode 70 source class access input modules 10, emitter access pwm chip 60 voltage input ends.

Pwm chip 60 outputs are connected to metal-oxide-semiconductor 30 base stages.

After the direct voltage input, the transformer work that main winding 20 and output winding 50 form, thus triode base emitter-base bandgap grading conducting simultaneously makes pwm chip with the ON time of regulating metal-oxide-semiconductor, to maintain the output voltage stabilization of output winding by regulating duty ratio; After the direct voltage input reduced or disconnects, output winding 50 and power supply winding 40 formed transformer, and electric current feeds back to pwm chip and metal-oxide-semiconductor again, and, because triode no longer is in conducting state, makes electric current can not be sent to main winding.The voltage of pwm chip still can keep after DC input voitage disconnects, when next DC input voitage input, pwm chip starts again by the input voltage power supply, the energy storage of power supply winding.

In the present invention, when circuit is in normal operating conditions, the control module that pwm chip and metal-oxide-semiconductor form can be regulated the voltage of output winding output normally, when circuit is not in normal operating conditions, because the control module that pwm chip and metal-oxide-semiconductor form that is arranged so that of triode and power supply winding still can work, triode also plays the effect of circuit isolation simultaneously, make main winding and pwm chip separate, reduce the electromagnetic interference of main winding to pwm chip.

Please refer to Fig. 2, preferably, the present invention also comprises filtration module 80, described filtration module 80 is arranged between input module 10 and main winding 20, described filtration module 80 comprises three parallel branches, the first parallel branch consists of the second capacitor C 2, and the second parallel branch consists of the first inductance L 1 and the second inductance L 2, and the 3rd parallel branch consists of the 3rd resistance R 3 and the 4th resistance R 4; Wire 801 1 ends are arranged between the first inductance L 1 and the second inductance L 2, and the other end is arranged between the 3rd resistance R 3 and the 4th resistance R 4.

The filtration module that adopts foregoing circuit to connect is better to the DC input voitage filter effect.

Preferably, the present invention also comprises metal-oxide-semiconductor drain voltage protection module 90, and described metal-oxide-semiconductor drain voltage protection module 90 and main winding 20 is in parallel and connect with metal-oxide-semiconductor 30; Described metal-oxide-semiconductor drain voltage protection module 90 comprises the first capacitor C 1, the first voltage stabilizing didoe W1, a plurality of the first resistance R 1, the first diode D1 be connected in series; After being connected in parallel, described the first capacitor C 1, the first voltage stabilizing didoe W1, the first resistance R 1 be connected in series with the first diode D1; The first voltage stabilizing didoe W1 and the first diode D1 negative pole equipotential arrange, and metal-oxide-semiconductor 30 drain electrodes are connected with the first diode D1 is anodal.

After DC input voitage reduced or disconnects, output winding 50 not only formed transformer with power supply winding 40, made power supply winding 40 can continue, to pwm chip and metal-oxide-semiconductor power supply, also to make on main winding 20 and also produce flyback converter.In order to make flyback converter not affect metal-oxide-semiconductor voltage, metal-oxide-semiconductor drain voltage protection module 90 absorbs this flyback converter to consume.

In power module of the present invention, the performance parameter of main winding 20 has larger impact to operational efficiency, the Electro Magnetic Compatibility of whole circuit.The inductance value Lp of main winding 20, peakflux density Bp, magnetic core air gap length L g, umber of turn Tp directly affect the performance of main winding 20.In the application, by following empirical equation, determine inductance value Lp, peakflux density Bp, magnetic core air gap length L g and the umber of turn Tp of main winding 20, make main winding 20 have good performance:

$\mathrm{Lp}=\frac{U^2{A}^2}{\mathrm{fP}}$

$\mathrm{Bp}=\frac{135\×\mathrm{Lp}}{I}$

$\mathrm{Tp}=\frac{U\×A}{f\×\mathrm{Bp}}$

$\mathrm{Lg}=\frac{3\mathrm{\π}\×T{p}^2\×\mathrm{Bp}}{\mathrm{Lp}}$

Wherein, U explains input voltage value, and A means the maximum duty cycle value of pwm chip, and P means input power, the switching frequency of f statement metal-oxide-semiconductor, and I explains input current.

More preferably, the width, the spacing between winding wire that form the winding wire of main winding 20 are also the important parameters that affects main winding performance and Electro Magnetic Compatibility, in the application, the width of the single winding wire of main winding 20 is preferably 0.3 to 1.5 millimeter, and the gap between winding wire is preferably the 0.2-0.5 millimeter.

For the operating efficiency that makes power module integral body is higher, Electro Magnetic Compatibility is better, the application also specifically defines the following design parameter span of other components and parts in circuit, cooperation by those components and parts makes the power module performance better: described the first resistance value is 20-70 ohm, the first capacitance is 0.2 to 0.7 microfarad, the second capacitance is the 5-10 pico farad, the 3rd resistance value is 100-200 ohm, the 4th resistance value is 50-70 ohm, the first inductance value is the 0.5-1.5 milihenry, and the second inductance value is the 10-25 milihenry.

The present invention also provides a kind of servo-driver, and it comprises above-mentioned power module.By above-mentioned power module other module for power supply to servo-driver, the output voltage stabilization of power module, output electromagnetic interference are little, make the servo-driver can steady and high-precision operation.

Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Claims (7)

1. a servo-driver power module, is characterized in that: comprising: for the input module of input direct voltage; Main winding, metal-oxide-semiconductor, with main winding be in the same side the power supply winding, with main winding, be in not a plurality of output windings, pwm chip, the triode of homonymy; The power supply winding one end ground connection other end is connected to main winding, metal-oxide-semiconductor drain electrode, transistor collector and pwm chip voltage input end; The pwm chip output is connected to the metal-oxide-semiconductor base stage, and voltage input end also is connected with transistor emitter; Triode source class access input module; During the direct voltage input, the increase of main winding magnetic flux makes output winding output dc voltage with to other module for power supply of servo-driver, thereby triode base emitter-base bandgap grading conducting simultaneously makes pwm chip with the ON time of regulating metal-oxide-semiconductor, to maintain the output voltage stabilization of output winding by regulating duty ratio; When DC input voitage reduced or disconnect, inferior winding magnetic flux made greatly the power supply winding produce induced current than power supply winding magnetic flux and supplies with pwm chip and metal-oxide-semiconductor, maintain pwm chip and metal-oxide-semiconductor in working order.

2. servo-driver power module according to claim 1 is characterized in that: also comprise metal-oxide-semiconductor drain voltage protection module, described metal-oxide-semiconductor drain voltage protection module is in parallel with main winding and connect with metal-oxide-semiconductor; Described metal-oxide-semiconductor drain voltage protection module comprises the first electric capacity, the first voltage stabilizing didoe, a plurality of the first resistance be connected in series, the first diode; After being connected in parallel, described the first electric capacity, the first voltage stabilizing didoe, the first resistance is connected in series with the first diode; The first voltage stabilizing didoe and the first diode cathode equipotential arrange, and the metal-oxide-semiconductor drain electrode is connected with the first diode cathode.

3. servo-driver power module according to claim 1 and 2, it is characterized in that: also comprise filtration module, described filtration module is arranged between input module and main winding, described filtration module comprises three parallel branches, the first parallel branch consists of the second electric capacity, the second parallel branch consists of the first inductance and the second inductance, and the 3rd parallel branch consists of the 3rd resistance and the 4th resistance; Wire one end is arranged between the first inductance and the second inductance, and the other end is arranged between the 3rd resistance and the 4th resistance.

4. servo-driver power module according to claim 1 and 2 is characterized in that: the inductance value Lp of described main winding, peakflux density Bp, magnetic core air gap length L g, umber of turn Tp determine by following formula:

$\mathrm{Lp}=\frac{U^2{A}^2}{\mathrm{fP}}$

$\mathrm{Bp}=\frac{135\×\mathrm{Lp}}{I}$

$\mathrm{Tp}=\frac{U\×A}{f\×\mathrm{Bp}}$

$\mathrm{Lg}=\frac{3\mathrm{\π}\×T{p}^2\×\mathrm{Bp}}{\mathrm{Lp}}$

Wherein, U explains input voltage value, and A means the maximum duty cycle value of pwm chip, and P means input power, the switching frequency of f statement metal-oxide-semiconductor, and I explains input current.

5. servo-driver power module according to claim 4, it is characterized in that: in described main winding, the width of single winding wire is 0.3 to 1.5 millimeter, and the gap between winding wire is the 0.2-0.5 millimeter.

6. servo-driver power module according to claim 5, it is characterized in that: described the first resistance value is 20-70 ohm, the first capacitance is 0.2 to 0.7 microfarad, the second capacitance is the 5-10 pico farad, the 3rd resistance value is 100-200 ohm, the 4th resistance value is 50-70 ohm, and the first inductance value is the 0.5-1.5 milihenry, and the second inductance value is the 10-25 milihenry.

7. a servo-driver, is characterized in that: comprise the described servo-driver power module of claim 1-6 any one.

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