CN106712471A - PWM (Pulse-Width Modulation) power control device - Google Patents
PWM (Pulse-Width Modulation) power control device Download PDFInfo
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- CN106712471A CN106712471A CN201710112942.2A CN201710112942A CN106712471A CN 106712471 A CN106712471 A CN 106712471A CN 201710112942 A CN201710112942 A CN 201710112942A CN 106712471 A CN106712471 A CN 106712471A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a PWM (Pulse-Width Modulation) power control device. The PWM power control device comprises a conditioning unit, a driving signal parameter adjusting unit and a power driving unit, wherein the conditioning unit is used for converting a pulse wide modulation source signal into a direct-current signal; the driving signal parameter adjusting unit is connected with an output end of the conditioning unit and is used for comparing a triangular wave signal with a direct-current signal to generate a reference pulse signal meeting pre-set working frequency; and the power driving unit is connected with the output end of the driving signal parameter adjusting unit and is used for driving a switching tube according to the reference pulse signal and outputting a power signal. Compared with the same power control device, the input frequency of a PWM signal is reduced under the condition that system performances are not changed; meanwhile, the duty ratio control precision of the PWM signal is improved; and the size of an energy storage element is reduced, the cost is saved, and the working efficiency is improved.
Description
Technical field
The invention belongs to technical field of electronic control, more particularly to a kind of pwm power control device.
Background technology
Existing PWM (Pulse Width Modulation, pulse width modulation) signal power control circuit is comprising following
Two ways, the first, switching tube, controlled output power are directly driven using pwm signal；Second, driven using pwm driver
Dynamic power switch, controlled output power.However, aforesaid way wants the pwm signal that output frequency is fixed, often input and output
Frequency will be matched, it is impossible to control the dutycycle precision of pwm signal.
The content of the invention
The shortcoming of prior art, it is an object of the invention to provide a kind of pwm power control device, uses in view of the above
In solve the problems, such as in the prior art signal power control the uncontrollable pwm signal dutycycle precision of electric installation.
In order to achieve the above objects and other related objects, the present invention provides a kind of pwm power control device, including：
Conditioning unit, is suitable to for pulse width modulation source signal to be converted into direct current signal；
Drive signal parameters adjustment unit, the output end with the conditioning unit is connected, be suitable to compare triangular signal with
Direct current signal generation meets the reference burst signal of default working frequency；
Power drive unit, the output end with the drive signal parameters adjustment unit is connected, and is suitable to according to the reference
Pulse signal driving switch pipe power output signal.
As described above, pwm power control device of the invention, has the advantages that：
Compared to same output control device, on the premise of systematic function is constant, the input of pwm signal is reduced frequently
Rate, meanwhile, improve the Duty ratio control precision of pwm signal；Energy-storage travelling wave tube size is reduced, it is cost-effective, improve its work
Make efficiency.
Brief description of the drawings
Fig. 1 is shown as a kind of pwm power control device structured flowchart of present invention offer；
Fig. 2 is shown as a kind of structured flowchart of the conditioning unit of pwm power control device of present invention offer；
Fig. 3 is shown as a kind of structure of the drive signal parameters adjustment unit of pwm power control device of present invention offer
Block diagram；
Fig. 4 is shown as a kind of structured flowchart of the power drive unit of pwm power control device of present invention offer；
Fig. 5 is shown as a kind of circuit structure diagram of pwm power control device of present invention offer.
Component label instructions：
1 conditioning unit
2 drive signal parameters adjustment units
3 power drive units
11 first switch circuits
12 second switch circuits
13 first filter circuits
21 concussion subelements
22 drive signal generating subunits
31 drive subelement
32 switch unit of pipe
33 second filter circuits
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages of the invention and effect easily.The present invention can also be by specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that, in the case where not conflicting, following examples and implementation
Feature in example can be mutually combined.
It should be noted that the diagram provided in following examples only illustrates basic structure of the invention in a schematic way
Think, component count, shape and size when only display is with relevant component in the present invention rather than according to actual implementation in schema then
Draw, it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout kenel
It is likely more complexity.
Fig. 1 is referred to, the present invention provides a kind of pwm power control device structured flowchart, including：
Conditioning unit 1, is suitable to for pulse width modulation source signal to be converted into direct current signal；
Drive signal parameters adjustment unit 2, the output end with the conditioning unit is connected, be suitable to compare triangular signal with
Direct current signal generation meets the reference burst signal of default working frequency；
Power drive unit 3, the output end with the drive signal parameters adjustment unit is connected, and is suitable to according to the reference
Pulse signal driving switch pipe power output signal.
In the present embodiment, pulse width modulation source signal (the i.e. initial input of the input of the conditioning unit 1 low frequency
Pwm signal), such as 1KHZ reduces the hardware requirement of the system of input, simultaneously as input drive signal parameter adjustment unit 2
Direct current signal dutycycle stable accuracy, drive signal parameters adjustment unit 2 can be modulated to the reference of default working frequency
Low frequency, i.e., be converted into high frequency so that the reference burst signal dutycycle of output by pulse signal (pwm signal after modulating)
Greatly, precision is higher, and power drive unit 3 improves power output using the break-make of reference burst signal driving switch pipe.
Fig. 2 is referred to, is a kind of structured flowchart of the conditioning unit of the pwm power control device for providing of the invention, including：
First switch circuit 11, is suitable to receive one triode of the pulse width modulation source signal conducting, exports the first arteries and veins
Signal is rushed, triode is on or by state according to the low and high level of pulse width modulation source signal.
Second switch circuit 12, is that two symmetrical and load identical triode is constituted, with the first switch circuit
Output end is connected, and is suitable to turn on two triode output duty cycles the second pulse signal in a balanced way according to the first pulse-modulated signal；
Second switch circuit 12 is constituted by symmetrical switching tube Q2 and Q3, and their loads are identical so that the dutycycle letter of output PWM
Number precision can be stablized.
First filter circuit 13, the output end with the second switch circuit 12 is connected, and is suitable to believe the second arteries and veins system
Number filtering obtains direct current signal, and first filter circuit is preferably capacitance-resistance filter, filters the exchange letter in the second pulse signal
Number direct current signal is obtained, the circuit filtering efficiency is higher, the effect with step-down current limliting, it is larger to be widely used in load, electricity
The stream less scene of smaller and ripple coefficient.
Specifically, conditioning unit is launched according to foregoing circuit, and its annexation is as shown in figure 5, details are as follows：
The first switch circuit 11 includes the first triode, first resistor, second resistance, 3rd resistor with the first electricity
Hold, one end of the first resistor connects the pulse width modulation source signal, and its other end connects first triode
Base stage, the second resistance is connected between the emitter stage of the triode and base stage, and first capacitance connection is in the triode
Colelctor electrode and emitter stage between, the 3rd resistor connects the colelctor electrode of first triode, wherein, load resistance (the
One resistance, second resistance, 3rd resistor), when the first triode ON, its grounded emitter, when it is in cut-off, first and
Two electric resistance partial pressures, and second resistance in order to ensure when the first triode is not input into its be in the state of cutting, first electric capacity is
The waveform of the first pulse signal of stable output.
The second switch circuit 12 includes the second triode, the 3rd triode, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, the 7th resistance and the 8th resistance, the base stage of second triode connect the 4th resistance, one end of the 5th resistance, institute respectively
The base stage for stating the 3rd triode connects the 6th resistance, one end of the 7th resistance respectively, and the 4th resistance is another with the 6th resistance
One end connects the colelctor electrode of the first triode, and the 5th resistance, the other end of the 7th resistance are connected respectively the two or three pole
The emitter stage of pipe, the emitter stage of the 3rd triode, second triode and the 3rd triode is connected with each other as output end, the
Two triodes form corresponding symmetrical switch pipe between the two with the 3rd triode, and the 8th resistance is the drop-down of the 3rd triode
Resistance, for stablizing impedance, it is ensured that the second pulse signal dutycycle stable accuracy of output end output, the 5th resistance and the 7th electricity
Resistance is identical with second resistance effect, does not repeat one by one herein.
First filter circuit 13 includes the 9th resistance, the tenth resistance, the second electric capacity and the 3rd electric capacity, the 9th electricity
Resistance is sequentially connected in series in the output end of second switch circuit with the tenth resistance, and described second electric capacity one end is connected to the 9th resistance and the
Between ten resistance, one end of the 3rd electric capacity is connected to the other end of the tenth resistance as output end, second electric capacity with
The other end of the 3rd electric capacity is grounded.
In the present embodiment, by turning on the first pulse signal that the output amplitude of first switch circuit 11 is VREF, according to
The output duty cycle stabilization of first pulse signal conducting second switch circuit 12 and the second relatively low pulse signal of frequency, are filtered using RC
Wave circuit is filtered to second pulse signal, filters out interference signal output direct current signal.
Fig. 3 is referred to, is a kind of knot of the drive signal parameters adjustment unit of the pwm power control device for providing of the invention
Structure block diagram includes：
Concussion subelement 21, is suitable to be configured according to oscillating circuit the working frequency of triangular signal；
Drive signal generating subunit 22, the output end with the concussion subelement is connected, be suitable to according to direct current signal and
The reference burst signal of the default working frequency of triangular signal generation of fixed working frequency.
As shown in figure 5, concussion subelement 21 includes the 11st resistance and the 6th electric capacity, by the 11st resistance and the 6th electricity
Hold the working frequency of i.e. configurable triangular signal, can adjust output by the working frequency for adjusting triangular signal refers to arteries and veins
The frequency of signal is rushed, the drive signal generating subunit U1 is fixed frequency pulse-width modulation circuit, wherein, the fixed frequency arteries and veins
The model of modulation circuit wide can be TL494, be internally provided with error comparator, due to because the voltage of triangular wave and direct current signal
The reference burst signal for producing default working frequency is compared, only when the voltage of the voltage more than direct current signal of triangular wave
When, reference burst signal could be exported, and as direct current signal increases, the pulsewidth of the reference burst signal of output reduces.Due to
Fixed frequency pulse-width modulation circuit contains the required repertoire of Switching Power Supply control, is widely used in single-end ortho-exciting two-tube
Formula, semibridge system, full-bridge type Switching Power Supply.
Fig. 4 is referred to, is a kind of structured flowchart of the power drive unit of the pwm power control device for providing of the invention,
Including：
Subelement 31 is driven, it is input, output switch pipe drive signal to be suitable to according to reference burst signal；
Specifically, it is switch drive chip to drive the U2 in such as Fig. 5 of subelement 31, and its model is preferably IR2110, has concurrently
Light-coupled isolation and the advantage of electromagnetic isolation, are widely used in driver in middle low power converting means.
Switch unit of pipe 32, the output end with the driving subelement is connected, and is suitable to be driven according to the switching tube and believes
The work of number driving switch pipe, power output signal.
Specifically, such as the breaker in middle pipe Q4 of accompanying drawing 5, switch pipe driving chip U2 output ends be connected with filter circuit (C9,
R18), it has the effect of separated by direct communication, wherein, switching tube Q4 is preferably FET.
Second filter circuit 33, is suitable to be filtered the power signal obtained under CF to the power signal for exporting.
Specifically, including inductance, the 4th electric capacity and the 5th electric capacity, inductance one end connection is described drives the defeated of subelement
Go out end to be connected, one end power output signal of the other end of the inductance the 4th electric capacity in parallel and the 5th electric capacity successively, described the
Four electric capacity are grounded with the other end of the 5th electric capacity, filtering interference signals so that the power signal of its output CF, compare
In other power output signals, using inductance and electric capacity, not only the function with energy storage, reduces the size of energy storage device, also
It is cost-effective, improve the efficiency of work.
In the present embodiment, the supply voltage of 48V may be such that the electricity of connecting valve pipe Q4 by filter capacitor (C7 and C8)
Pressure stabilization, favourable to voltage stabilizing, the diode D2 of reverse parallel connection has protection switch pipe Q4, prevents it to be damaged.In addition, when driving
When signal parameter adjustment unit exports the drive signal of CF, it is set to send conducting switch by driving switch die
Pipe, power output signal is filtered voltage stabilizing to the power signal, the power control signal for making it be transformed to stabilization.
In sum, the present invention compares same output control device, on the premise of systematic function is constant, reduces
The incoming frequency of pwm signal, meanwhile, improve the Duty ratio control precision of pwm signal；Energy-storage travelling wave tube size is reduced, is saved
Cost, improves its operating efficiency.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial profit
With value.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (10)
1. a kind of pwm power control device, it is characterised in that including：
Conditioning unit, is suitable to for pulse width modulation source signal to be converted into direct current signal；
Drive signal parameters adjustment unit, the output end with the conditioning unit is connected, and is suitable to compare triangular signal and direct current
Signal generation meets the reference burst signal of default working frequency；
Power drive unit, the output end with the drive signal parameters adjustment unit is connected, and is suitable to according to the reference pulse
Signal driving switch pipe power output signal.
2. pwm power control device according to claim 1, it is characterised in that the conditioning unit includes：
First switch circuit, is suitable to receive one triode of the pulse width modulation source signal conducting, exports the first pulse signal；
Second switch circuit, is that two symmetrical and load identical triode is constituted, the output end with the first switch circuit
It is connected, is suitable to turn on two triode output duty cycles the second pulse signal in a balanced way according to the first pulse-modulated signal；
First filter circuit, the output end with the second switch circuit is connected, and is suitable to obtain the second arteries and veins signal filtering
To direct current signal.
3. pwm power control device according to claim 2, it is characterised in that the first switch circuit includes first
Triode, first resistor, second resistance, 3rd resistor and the first electric capacity, one end connection pulse of the first resistor are wide
Degree modulation source signal, its other end connects the base stage of first triode, and the second resistance is connected to the hair of the triode
Between emitter-base bandgap grading and base stage, between the colelctor electrode and emitter stage of the triode, the 3rd resistor connects first capacitance connection
Connect the colelctor electrode of first triode.
4. pwm power control device according to claim 2, it is characterised in that the second switch circuit includes second
Triode, the 3rd triode, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, the two or three pole
The base stage of pipe connects the 4th resistance, one end of the 5th resistance respectively, the base stage of the 3rd triode connect respectively the 6th resistance,
One end of 7th resistance, the 4th resistance is connected the colelctor electrode of the first triode, the described 5th with the other end of the 6th resistance
Resistance, the other end of the 7th resistance are connected respectively the second triode, the emitter stage of the 3rd triode, second triode
Emitter stage with the 3rd triode is connected with each other as output end.
5. pwm power control device according to claim 2, it is characterised in that first filter circuit includes the 9th
Resistance, the tenth resistance, the second electric capacity and the 3rd electric capacity, the 9th resistance and the tenth resistance are sequentially connected in series in second switch circuit
Output end, described second electric capacity one end is connected between the 9th resistance and the tenth resistance, one end connection of the 3rd electric capacity
In the tenth resistance the other end as output end, second electric capacity is grounded with the other end of the 3rd electric capacity.
6. pwm power control device according to claim 1, it is characterised in that the drive signal parameters adjustment unit
Including：
Concussion subelement, is suitable to be configured according to oscillating circuit the working frequency of triangular signal；
Drive signal generating subunit, the output end with the concussion subelement is connected, and is suitable to according to direct current signal and regular worker
The reference burst signal of the default working frequency of triangular signal generation of working frequency.
7. pwm power control device according to claim 6, it is characterised in that the drive signal parameters adjustment unit
It is the fixed frequency pulse-width modulation circuit comprising concussion subelement with drive signal generating subunit.
8. pwm power control device according to claim 1, it is characterised in that the power drive unit includes：
Subelement is driven, it is input, output switch pipe drive signal to be suitable to according to reference burst signal；
Switch unit of pipe, the output end with the driving subelement is connected, and is suitable to be driven according to the switching tube drive signal
Switching tube works, power output signal.
Second filter circuit, is suitable to be filtered the power signal obtained under CF to the power signal for exporting.
9. pwm power control device according to claim 8, it is characterised in that the driving subelement is that switching tube drives
Dynamic chip, the switch unit of pipe is the switching tube of power output signal.
10. pwm power control device according to claim 8, it is characterised in that second filter circuit includes electricity
Sense, the 4th electric capacity and the 5th electric capacity, inductance one end connection output end for driving subelement are connected, the inductance it is another
One end power output signal of one end 4th electric capacity in parallel and the 5th electric capacity successively, the 4th electric capacity is another with the 5th electric capacity
End is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710112942.2A CN106712471B (en) | 2017-02-28 | 2017-02-28 | PWM power control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710112942.2A CN106712471B (en) | 2017-02-28 | 2017-02-28 | PWM power control device |
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| CN106712471A true CN106712471A (en) | 2017-05-24 |
| CN106712471B CN106712471B (en) | 2023-05-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995192A (en) * | 2019-11-16 | 2020-04-10 | 东风电驱动系统有限公司 | PWM signal processing method and system |
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| Publication number | Publication date |
|---|---|
| CN106712471B (en) | 2023-05-23 |
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