CN106712471B - PWM power control device - Google Patents
PWM power control device Download PDFInfo
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- CN106712471B CN106712471B CN201710112942.2A CN201710112942A CN106712471B CN 106712471 B CN106712471 B CN 106712471B CN 201710112942 A CN201710112942 A CN 201710112942A CN 106712471 B CN106712471 B CN 106712471B
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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
Abstract
The present invention provides a PWM power control device, comprising: the conditioning unit is suitable for converting the pulse width modulation source signal into a direct current signal; the driving signal parameter adjusting unit is connected with the output end of the conditioning unit and is suitable for comparing the triangular wave signal and the direct current signal to generate a reference pulse signal which accords with a preset working frequency; and the power driving unit is connected with the output end of the driving signal parameter adjusting unit and is suitable for driving the switching tube according to the reference pulse signal to output a power signal. Compared with the same power control device, the input frequency of the PWM signal is reduced on the premise of unchanged system performance, and meanwhile, the control precision of the duty ratio of the PWM signal is improved; the size of the energy storage element is reduced, the cost is saved, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of electronic control, and particularly relates to a PWM power control device.
Background
The existing PWM (Pulse Width Modulation ) signal power control circuit comprises the following two modes, wherein the first mode is to directly drive a switching tube by adopting a PWM signal to control output power; second, a PWM driver is used to drive the power switch to control the output power. However, in the above method, a PWM signal with a fixed frequency is output, and the input frequency and the output frequency are often matched, so that the duty ratio accuracy of the PWM signal cannot be controlled.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a PWM power control apparatus, which is used for solving the problem that the signal power control apparatus in the prior art cannot control the duty cycle accuracy of the PWM signal.
To achieve the above and other related objects, the present invention provides a PWM power control apparatus comprising:
the conditioning unit is suitable for converting the pulse width modulation source signal into a direct current signal;
the driving signal parameter adjusting unit is connected with the output end of the conditioning unit and is suitable for comparing the triangular wave signal and the direct current signal to generate a reference pulse signal which accords with a preset working frequency;
and the power driving unit is connected with the output end of the driving signal parameter adjusting unit and is suitable for driving the switching tube to output a power signal according to the reference pulse signal.
As described above, the PWM power control apparatus of the present invention has the following advantageous effects:
compared with the same power control device, the input frequency of the PWM signal is reduced on the premise of unchanged system performance, and meanwhile, the control precision of the duty ratio of the PWM signal is improved; the size of the energy storage element is reduced, the cost is saved, and the working efficiency is improved.
Drawings
Fig. 1 shows a block diagram of a PWM power control apparatus according to the present invention;
fig. 2 shows a block diagram of a conditioning unit of a PWM power control apparatus according to the present invention;
fig. 3 is a block diagram showing a driving signal parameter adjusting unit of a PWM power control apparatus according to the present invention;
fig. 4 shows a block diagram of a power driving unit of a PWM power control apparatus according to the present invention;
fig. 5 shows a circuit configuration diagram of a PWM power control apparatus according to the present invention.
Description of element numbers:
1. conditioning unit
2. Drive signal parameter adjusting unit
3. Power drive unit
11. First switch circuit
12. Second switching circuit
13. First filter circuit
21. Vibrator unit
22. Drive signal generation subunit
31. Drive subunit
32. Switch tube unit
33. Second filter circuit
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Referring to fig. 1, the present invention provides a block diagram of a PWM power control apparatus, including:
a conditioning unit 1 adapted to convert the pwm source signal into a dc signal;
the driving signal parameter adjusting unit 2 is connected with the output end of the conditioning unit and is suitable for comparing the triangular wave signal and the direct current signal to generate a reference pulse signal which accords with a preset working frequency;
and the power driving unit 3 is connected with the output end of the driving signal parameter adjusting unit and is suitable for driving the switching tube to output a power signal according to the reference pulse signal.
In this embodiment, the conditioning unit 1 inputs a low-frequency pulse width modulation source signal (i.e., an initially input PWM signal), for example, 1KHZ, so as to reduce the hardware requirement of the input system, and meanwhile, since the duty cycle precision of the direct current signal input to the driving signal parameter adjusting unit 2 is stable, the driving signal parameter adjusting unit 2 can modulate the low-frequency pulse width modulation source signal into a reference pulse signal (i.e., a modulated PWM signal) with a preset working frequency, that is, convert the low frequency into a high frequency, so that the duty cycle of the output reference pulse signal is large and the precision is higher, and the power driving unit 3 adopts the reference pulse signal to drive the on-off of the switching tube, thereby improving the power output.
Referring to fig. 2, a block diagram of a conditioning unit of a PWM power control apparatus according to the present invention includes:
the first switch circuit 11 is adapted to receive the pwm source signal and turn on a transistor, and output a first pulse signal, where the transistor is in a turned-on or turned-off state according to the high and low levels of the pwm source signal.
The second switching circuit 12 is formed by two symmetrical triodes with the same load, is connected with the output end of the first switching circuit, and is suitable for conducting the two triodes according to a first pulse modulation signal to output a second pulse signal with balanced duty ratio; the second switching circuit 12 is formed by symmetrical switching transistors Q2 and Q3 and the loads of them are the same, so that the duty ratio signal precision of the output PWM can be stabilized.
The first filter circuit 13 is connected to the output end of the second switch circuit 12, and is suitable for filtering the second pulse signal to obtain a direct current signal, and the first filter circuit is preferably a resistor-capacitor filter, filters the alternating current signal in the second pulse signal to obtain the direct current signal, and has the advantages of higher filtering efficiency, voltage reduction and current limiting, and is widely applied to scenes with larger load, smaller current and smaller ripple coefficient.
Specifically, the conditioning unit is developed according to the above circuit, and the connection relationship is as shown in fig. 5, which is described in detail as follows:
the first switch circuit 11 includes a first triode, a first resistor, a second resistor, a third resistor and a first capacitor, one end of the first resistor is connected with the pwm source signal, the other end of the first resistor is connected with the base of the first triode, the second resistor is connected between the emitter and the base of the triode, the first capacitor is connected between the collector and the emitter of the triode, the third resistor is connected with the collector of the first triode, wherein, when the first triode is turned on, the emitter of the first triode is grounded, the first resistor and the second resistor are divided, the second resistor is in a cut-off state in order to ensure that the first triode is not input, and the first capacitor is used for stabilizing the waveform of the output first pulse signal.
The second switch circuit 12 includes a second triode, a third triode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor, the base of the second triode is connected with one end of the fourth resistor and one end of the fifth resistor respectively, the base of the third triode is connected with one end of the sixth resistor and one end of the seventh resistor respectively, the other ends of the fourth resistor and the sixth resistor are connected with the collector of the first triode, the other ends of the fifth resistor and the seventh resistor are correspondingly connected with the emitter of the second triode and the emitter of the third triode respectively, the emitters of the second triode and the third triode are mutually connected to form a corresponding symmetrical switch tube between the second triode and the third triode, the eighth resistor is a pull-down resistor of the third triode and is used for stabilizing impedance, the duty ratio precision of the second pulse signal output by the output end is ensured to be stable, the fifth resistor and the seventh resistor have the same effect with the second resistor, which is not described here.
The first filter circuit 13 includes a ninth resistor, a tenth resistor, a second capacitor and a third capacitor, where the ninth resistor and the tenth resistor are sequentially connected in series to the output end of the second switch circuit, one end of the second capacitor is connected between the ninth resistor and the tenth resistor, one end of the third capacitor is connected to the other end of the tenth resistor as the output end, and the other ends of the second capacitor and the third capacitor are grounded.
In this embodiment, by turning on the first switch circuit 11 to output a first pulse signal with the amplitude VREF, turning on the second switch circuit 12 according to the first pulse signal to output a second pulse signal with a stable duty ratio and a low frequency, filtering the second pulse signal by using an RC filter circuit, and filtering out an interference signal to output a dc signal.
Referring to fig. 3, a block diagram of a driving signal parameter adjusting unit of a PWM power control apparatus according to the present invention includes:
an oscillator subunit 21 adapted to configure the working frequency of the triangular wave signal according to the oscillating circuit;
the driving signal generating subunit 22 is connected to the output end of the oscillator subunit, and is adapted to generate a reference pulse signal with a preset working frequency according to the direct current signal and the triangular wave signal with a fixed working frequency.
As shown in fig. 5, the oscillator unit 21 includes an eleventh resistor and a sixth capacitor, the working frequency of the triangular wave signal can be configured through the eleventh resistor and the sixth capacitor, the frequency of the output reference pulse signal can be adjusted through adjusting the working frequency of the triangular wave signal, the driving signal generating subunit U1 is a fixed frequency pulse width modulation circuit, wherein the model of the fixed frequency pulse width modulation circuit can be TL494, and an error comparator is arranged in the fixed frequency pulse width modulation circuit, and since the voltage of the triangular wave and the voltage of the direct current signal are compared to generate the reference pulse signal with the preset working frequency, the reference pulse signal can be output only when the voltage of the triangular wave is greater than the voltage of the direct current signal, and the pulse width of the output reference pulse signal is reduced as the direct current signal increases. The fixed frequency pulse width modulation circuit comprises all functions required by the control of the switching power supply and is widely applied to single-end forward double-tube type, half-bridge type and full-bridge type switching power supplies.
Referring to fig. 4, a block diagram of a power driving unit of a PWM power control apparatus according to the present invention includes:
a driving subunit 31 adapted to output a switching tube driving signal according to the reference pulse signal as an input;
specifically, the driving subunit 31 is a switch driving chip, such as U2 in fig. 5, and the model of the driving subunit is preferably IR2110, which has the advantages of optical coupling isolation and electromagnetic isolation, and is widely used as a driver in a medium-and-small power conversion device.
And the switching tube unit 32 is connected with the output end of the driving subunit and is suitable for driving the switching tube to work according to the driving signal of the switching tube and outputting a power signal.
Specifically, as shown in fig. 5, the output end of the switching tube Q4 of the switching tube driving chip U2 is connected with a filter circuit (C9, R18) which has the function of isolating the through-crossing, wherein the switching tube Q4 is preferably a field effect tube.
The second filter circuit 33 is adapted to filter the output power signal to obtain a power signal at a specific frequency.
Specifically, the power supply device comprises an inductor, a fourth capacitor and a fifth capacitor, wherein one end of the inductor is connected with the output end of the driving subunit, the other end of the inductor is sequentially connected with one ends of the fourth capacitor and the fifth capacitor in parallel to output power signals, the other ends of the fourth capacitor and the fifth capacitor are grounded, interference signals are filtered, and the power signals with specific frequencies are output.
In this embodiment, the voltage of the switching tube Q4 is stabilized by the filter capacitor (C7 and C8) at the power supply voltage of 48V, which is advantageous for voltage stabilization, and the anti-parallel diode D2 has the protection switching tube Q4 to prevent the same from being damaged. In addition, when the driving signal parameter adjusting unit outputs a driving signal with a specific frequency, the switching tube chip is driven to send out a switching tube to be conducted, a power signal is output, and the power signal is filtered and stabilized to be converted into a stable power control signal.
In summary, compared with the same power control device, the invention reduces the input frequency of the PWM signal on the premise of unchanged system performance, and improves the control precision of the duty ratio of the PWM signal; the size of the energy storage element is reduced, the cost is saved, and the working efficiency is improved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. A PWM power control apparatus, comprising:
the conditioning unit is suitable for converting the pulse width modulation source signal into a direct current signal; wherein the conditioning unit comprises:
the first switch circuit is suitable for receiving the pulse width modulation source signal to conduct a triode and output a first pulse signal; the second switching circuit is composed of two symmetrical triodes with the same load, is connected with the output end of the first switching circuit and is suitable for conducting the two triodes according to a first pulse modulation signal to output a second pulse signal with balanced duty ratio; the first filter circuit is connected with the output end of the second switch circuit and is suitable for filtering the second pulse signal to obtain a direct current signal;
the driving signal parameter adjusting unit is connected with the output end of the conditioning unit and is suitable for comparing the triangular wave signal and the direct current signal to generate a reference pulse signal which accords with a preset working frequency;
and the power driving unit is connected with the output end of the driving signal parameter adjusting unit and is suitable for driving the switching tube to output a power signal according to the reference pulse signal.
2. The PWM power control apparatus according to claim 1, wherein the first switching circuit comprises a first transistor, a first resistor, a second resistor, a third resistor and a first capacitor, one end of the first resistor is connected to the PWM source signal, the other end of the first resistor is connected to the base of the first transistor, the second resistor is connected between the emitter and the base of the transistor, the first capacitor is connected between the collector and the emitter of the transistor, and the third resistor is connected to the collector of the first transistor.
3. The PWM power control apparatus according to claim 1, wherein the second switching circuit includes a second triode, a third triode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor, bases of the second triode are respectively connected to one ends of the fourth resistor and the fifth resistor, bases of the third triode are respectively connected to one ends of the sixth resistor and the seventh resistor, the other ends of the fourth resistor and the sixth resistor are connected to a collector of the first triode, the other ends of the fifth resistor and the seventh resistor are respectively and correspondingly connected to emitters of the second triode and the third triode, and emitters of the second triode and the third triode are mutually connected as output ends.
4. The PWM power control apparatus according to claim 1, wherein the first filter circuit includes a ninth resistor, a tenth resistor, a second capacitor and a third capacitor, the ninth resistor and the tenth resistor are sequentially connected in series to the output terminal of the second switch circuit, one end of the second capacitor is connected between the ninth resistor and the tenth resistor, one end of the third capacitor is connected to the other end of the tenth resistor as the output terminal, and the other ends of the second capacitor and the third capacitor are both grounded.
5. The PWM power control apparatus according to claim 1, wherein the driving signal parameter adjusting unit includes:
the oscillator unit is suitable for configuring the working frequency of the triangular wave signal according to the oscillating circuit;
the driving signal generating subunit is connected with the output end of the oscillator subunit and is suitable for generating a reference pulse signal with a preset working frequency according to the direct current signal and the triangular wave signal with a fixed working frequency.
6. The PWM power control apparatus according to claim 5, wherein the driving signal parameter adjusting unit is a fixed frequency pulse width modulation circuit including an oscillating subunit and a driving signal generating subunit.
7. The PWM power control apparatus according to claim 1, wherein the power driving unit includes:
a driving subunit, adapted to output a switching tube driving signal according to the reference pulse signal;
the switching tube unit is connected with the output end of the driving subunit and is suitable for driving the switching tube to work according to the switching tube driving signal and outputting a power signal;
and the second filter circuit is suitable for filtering the output power signal to obtain a power signal under a specific frequency.
8. The PWM power control apparatus of claim 7, wherein the drive subunit is a switching tube drive chip and the switching tube subunit is a switching tube outputting a power signal.
9. The PWM power control apparatus according to claim 7, wherein the second filter circuit comprises an inductor, a fourth capacitor and a fifth capacitor, one end of the inductor is connected to the output end of the driving subunit, the other end of the inductor is sequentially connected to one ends of the fourth capacitor and the fifth capacitor and outputs the power signal, and the other ends of the fourth capacitor and the fifth capacitor are grounded.
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| CN201710112942.2A CN106712471B (en) | 2017-02-28 | 2017-02-28 | PWM power control device |
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