CN114244077A - Power supply circuit and power supply method suitable for wide voltage output - Google Patents
Power supply circuit and power supply method suitable for wide voltage output Download PDFInfo
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- CN114244077A CN114244077A CN202210171897.9A CN202210171897A CN114244077A CN 114244077 A CN114244077 A CN 114244077A CN 202210171897 A CN202210171897 A CN 202210171897A CN 114244077 A CN114244077 A CN 114244077A
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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
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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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Abstract
The invention provides a power supply circuit and a power supply method suitable for wide voltage output. The power supply circuit comprises a pulse width modulation integrated circuit chip PWM IC, a voltage stabilizing circuit, a first rectification half-bridge circuit, a second rectification half-bridge circuit and a transformer. Through constructing the rectification voltage stabilizing circuit comprising a voltage stabilizing circuit, a first rectification half-bridge circuit and a second rectification half-bridge circuit, and presetting the coil turn ratio of different secondary windings respectively connected with the first rectification half-bridge circuit and the second rectification half-bridge circuit, the automatic regulation of the output voltage of the PD charger is realized, stable power input is provided for a PWM IC, the product stability is improved, and the energy consumption is reduced.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a power supply circuit and a power supply method suitable for wide voltage output.
Background
The PD charger (USB Power Delivery), which is a fast dc charger based on a fast charging specification established by the USB-IF organization, can provide a large voltage output range. The PD charger generally uses a PWM IC to provide a control signal to a main power device of the PD charger, and a power supply of the PWM IC is derived from an output voltage of the PD charger.
The power supply voltage of the PD charger to the PWM IC is unstable due to the large voltage output range of the PD charger, and when the output voltage of the PD charger is low, the condition that the starting voltage of the PWM IC cannot be reached is often generated; when the output voltage of the PD charger is low, in the prior art, an additional rectifying and voltage stabilizing circuit is used for voltage reduction, so that the technical scheme needs to increase additional cost on the one hand, and reduces the stability of the power supply, and on the other hand, the rectifying and voltage stabilizing circuit has large loss, which leads to the increase of the power consumption of the PD charger and the reduction of the product efficiency.
Accordingly, there is a need for one or more methods to address the above-mentioned problems.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
An object of the present invention is to provide a power supply circuit and a power supply method that are adaptive to a wide voltage output, thereby overcoming, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
According to one aspect of the present invention, a power supply circuit adapted to wide voltage output is provided, which includes a PWM IC, a voltage stabilizing circuit, a first rectifying half-bridge circuit, a second rectifying half-bridge circuit, and a transformer, wherein:
the transformer comprises a secondary first winding and a secondary second winding, wherein a second port of the secondary first winding is connected with a first port of the secondary second winding so as to realize the series connection of the secondary first winding and the secondary second winding;
the input end of the first rectification half-bridge circuit is connected with the first port of the secondary first winding, the first output end of the first rectification half-bridge circuit is connected with the first input end of the voltage stabilizing circuit, the second output end of the first rectification half-bridge circuit is connected with the second port of the secondary second winding, and the first rectification half-bridge circuit is used for reducing the output voltage of the secondary first winding and the secondary second winding and supplying power to the PWM IC after passing through the voltage stabilizing circuit;
the input end of the second rectification half-bridge circuit is connected with the second port of the secondary first winding, the first output end of the second rectification half-bridge circuit is connected with the output end of the third diode, the second output end of the second rectification half-bridge circuit is connected with the second port of the secondary second winding, and the second rectification half-bridge circuit is used for supplying power to the PWM IC after the output voltage of the secondary second winding is reduced;
a second input end of the voltage stabilizing circuit is connected with a second port of the secondary second winding, and an output end of the voltage stabilizing circuit is connected with an input end of the third diode;
and a power supply pin VCC of the PWM IC is connected with the output end of the third diode.
In an exemplary embodiment of the invention, the first rectifying half-bridge circuit further comprises a first resistor, a first diode, a second capacitor and a fourth capacitor, wherein:
the input end of the first resistor is the input end of the first rectifying half-bridge circuit and is connected with the first port of the secondary first winding;
the input end of the first diode is connected with the output end of the first resistor, and the output end of the first diode is the first output end of the first rectification half-bridge circuit;
and a first port of the second capacitor connected with the fourth capacitor in parallel is connected with the output end of the first diode, and a second port of the second capacitor connected with the fourth capacitor in parallel is a second output end of the first rectification half-bridge circuit and is connected with a second port of the secondary second winding.
In an exemplary embodiment of the invention, the second rectifying half-bridge circuit further comprises a second resistor, a second diode, a first capacitor and a third capacitor, wherein:
the input end of the second resistor is the input end of the second rectifying half-bridge circuit and is connected with the second port of the secondary first winding;
the input end of the second diode is connected with the output end of the second resistor, and the output end of the second diode is the first output end of the second rectifying half-bridge circuit;
and a first port of the first capacitor connected with the third capacitor in parallel is connected with the output end of the second diode, and a second port of the first capacitor connected with the third capacitor in parallel is a second output end of the second rectification half-bridge circuit and is connected with a second port of the secondary second winding.
In an exemplary embodiment of the present invention, the voltage regulator circuit further includes a first triode, a fourth resistor, and a first voltage regulator, wherein:
the collector of the first triode is a first input end of the voltage stabilizing circuit and is connected with a first output end of the first rectifying half-bridge circuit;
the emitter of the first triode is the output end of the voltage stabilizing circuit and is connected with the input end of the third diode;
the input end of the first voltage-stabilizing tube is a second input end of the voltage stabilizing circuit and is connected with a second port of the secondary second winding;
the output end of the first voltage-regulator tube is connected with the base electrode of the first triode;
and a first port of the fourth resistor is connected with the collector of the first triode, and a second port of the fourth resistor is connected with the base of the first triode.
In an exemplary embodiment of the invention, the power supply circuit adapted to wide voltage output further includes a fifth capacitor for filtering, a sixth capacitor:
a first port of the fifth capacitor is connected with an output end of a third diode, and a second port of the fifth capacitor is connected with a second port of the secondary second winding;
and the first port of the sixth capacitor is connected with the first port of the secondary first winding, and the second port of the sixth capacitor is connected with the second port of the secondary second winding.
In an exemplary embodiment of the invention, the PWM IC further includes:
a PWM signal output pin of the PWM IC is connected with a grid electrode of the second MOS tube;
and the grounding pin of the PWM IC is connected with the second port of the secondary second winding.
In an exemplary embodiment of the invention, the transformer further comprises a secondary third winding:
through presetting the coil turn ratio of the secondary first winding, the secondary second winding and the secondary third winding, after the output voltage of the secondary second winding is reduced by the second rectification half-bridge circuit, the preset intensity voltage is added to the output end of the third diode, so that the voltage of the output end of the third diode is higher than the voltage of the input end of the third diode, and the effect of reducing the power consumption of the first triode is achieved.
In one aspect of the present invention, there is provided a power supply method adapted to wide voltage output, the method being implemented based on the power supply circuit adapted to wide voltage output as described above, the method comprising:
through presetting the coil turn ratio of a secondary first winding, a secondary second winding and a secondary third winding, when the voltage at two ends is lower than the preset voltage after the secondary first winding and the secondary second winding are connected in series, the PWM IC reduces the voltage of the output voltages of the secondary first winding and the secondary second winding through a first rectification half-bridge circuit, and supplies power after passing through a voltage stabilizing circuit;
when the voltage at two ends of the secondary first winding and the secondary second winding after being connected in series is higher than the preset voltage, the PWM IC of the pulse width modulation integrated circuit chip is powered by a second rectification half-bridge circuit after the output voltage of the secondary second winding is reduced;
through presetting the coil turn ratio of the secondary first winding, the secondary second winding and the secondary third winding, after the output voltage of the secondary second winding is reduced by the second rectification half-bridge circuit, the preset intensity voltage is added to the output end of the third diode, so that the voltage of the output end of the third diode is higher than the voltage of the input end of the third diode, and the effect of reducing the power consumption of the first triode is achieved.
The power supply circuit adapting to the wide voltage output in the exemplary embodiment of the invention comprises a pulse width modulation integrated circuit chip PWM IC, a voltage stabilizing circuit, a first rectification half-bridge circuit, a second rectification half-bridge circuit and a transformer. According to the invention, the automatic regulation of the output voltage of the PD charger is realized by constructing the voltage stabilizing circuit, the first rectifying half-bridge circuit and the second rectifying half-bridge circuit and presetting the coil turn ratio of different secondary windings respectively connected with the first rectifying half-bridge circuit and the second rectifying half-bridge circuit, so that stable power input is provided for a PWM IC, the product stability is improved and the energy consumption is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a circuit diagram of a power supply circuit accommodating a wide voltage output according to an exemplary embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
In the present exemplary embodiment, a power supply circuit that accommodates a wide voltage output is first provided. Referring to fig. 1, the power supply circuit adapted to wide voltage output includes a PWM IC 100, a voltage regulator circuit, a first rectifying half-bridge circuit, a second rectifying half-bridge circuit, and a transformer, wherein:
the transformer comprises a secondary first winding 501 and a secondary second winding 502, wherein a second port of the secondary first winding 501 is connected with a first port of the secondary second winding 502 to realize the series connection of the secondary first winding 501 and the secondary second winding 502;
the input end of the first rectifying half-bridge circuit is connected with the first port of the secondary first winding 501, the first output end of the first rectifying half-bridge circuit is connected with the first input end of the voltage stabilizing circuit, the second output end of the first rectifying half-bridge circuit is connected with the second port of the secondary second winding 502, the first rectifying half-bridge circuit is used for reducing the output voltage of the secondary first winding 501 and the secondary second winding 502, and after passing through the voltage stabilizing circuit, the first rectifying half-bridge circuit supplies power to the pulse width modulation integrated circuit chip PWM IC 100;
the input end of the second rectifying half-bridge circuit is connected with the second port of the secondary first winding 501, the first output end of the second rectifying half-bridge circuit is connected with the output end of the third diode 201, the second output end of the second rectifying half-bridge circuit is connected with the second port of the secondary second winding 502, and the second rectifying half-bridge circuit is used for supplying power to the PWM IC 100 after the output voltage of the secondary second winding 502 is reduced;
a second input end of the voltage stabilizing circuit is connected with a second port of the secondary second winding 502, and an output end of the voltage stabilizing circuit is connected with an input end of the third diode 201;
the power supply pin VCC of the PWM IC 100 is connected to the output terminal of the third diode 201.
The power supply circuit adapting to the wide voltage output in the exemplary embodiment of the invention comprises a pulse width modulation integrated circuit chip PWM IC, a voltage stabilizing circuit, a first rectification half-bridge circuit, a second rectification half-bridge circuit and a transformer. According to the invention, the automatic regulation of the output voltage of the PD charger is realized by constructing the voltage stabilizing circuit, the first rectifying half-bridge circuit and the second rectifying half-bridge circuit and presetting the coil turn ratio of different secondary windings respectively connected with the first rectifying half-bridge circuit and the second rectifying half-bridge circuit, so that stable power input is provided for a PWM IC, the product stability is improved and the energy consumption is reduced.
Next, a power supply circuit that accommodates wide voltage output in the present exemplary embodiment will be further described.
The transformer comprises a secondary first winding 501 and a secondary second winding 502, wherein a second port of the secondary first winding 501 is connected with a first port of the secondary second winding 502 to realize the series connection of the secondary first winding 501 and the secondary second winding 502.
In the embodiment of the present example, in order to solve the problem of power supply of the PWM IC 100 in the PD charger and reduce the loss, the secondary first winding 501, the secondary second winding 502, and the secondary third winding 503 of the transformer need to have a reasonable winding turn number design, and the first voltage regulator 204 needs to select a reasonable voltage regulation parameter.
The input end of the first rectification half-bridge circuit is connected with the first port of the secondary first winding 501, the first output end of the first rectification half-bridge circuit is connected with the first input end of the voltage stabilizing circuit, the second output end of the first rectification half-bridge circuit is connected with the second port of the secondary second winding 502, and the first rectification half-bridge circuit is used for reducing the output voltage of the secondary first winding 501 and the secondary second winding 502 and supplying power to the PWM IC 100 after passing through the voltage stabilizing circuit.
In the embodiment of the present example, the first rectifying half-bridge circuit comprises a first resistor 301, a first diode 302, a second capacitor 303 and a fourth capacitor 304, wherein:
the input end of the first resistor 301 is the input end of the first rectifying half-bridge circuit, and is connected to the first port of the secondary first winding 501;
the input end of the first diode 302 is connected with the output end of the first resistor 301, and the output end of the first diode 302 is the first output end of the first rectifying half-bridge circuit;
a first port of the second capacitor 303 connected in parallel with the fourth capacitor 304 is connected to the output end of the first diode 302, and a second port of the second capacitor 303 connected in parallel with the fourth capacitor 304 is a second output end of the first rectifying half-bridge circuit and is connected to a second port of the secondary second winding 502.
The input end of the second rectification half-bridge circuit is connected with the second port of the secondary first winding 501, the first output end is connected with the output end of the third diode 201, the second output end is connected with the second port of the secondary second winding 502, and the second rectification half-bridge circuit is used for supplying power to the PWM IC 100 after the output voltage of the secondary second winding 502 is reduced.
In the embodiment of the present example, the second rectifying half-bridge circuit includes a second resistor 401, a second diode 402, a first capacitor 403, and a third capacitor 404, wherein:
the input end of the second resistor 401 is the input end of the second rectifying half-bridge circuit, and is connected to the second port of the secondary first winding 501;
an input end of the second diode 402 is connected to an output end of the second resistor 401, and an output end of the second diode 402 is a first output end of the second rectifying half-bridge circuit;
a first port of the first capacitor 403 connected in parallel with the third capacitor 404 is connected to an output terminal of the second diode 402, and a second port of the first capacitor 403 connected in parallel with the third capacitor 404 is a second output terminal of the second rectifying half-bridge circuit and is connected to a second port of the secondary second winding 502.
The second input end of the voltage stabilizing circuit is connected with the second port of the secondary second winding 502, and the output end of the voltage stabilizing circuit is connected with the input end of the third diode 201.
In the embodiment of the present example, the voltage stabilizing circuit includes a first transistor 202, a fourth resistor 203, and a first regulator 204, wherein:
the collector of the first triode 202 is a first input end of the voltage stabilizing circuit and is connected with a first output end of the first rectifying half-bridge circuit;
the emitter of the first triode 202 is the output end of the voltage stabilizing circuit and is connected with the input end of the third diode 201;
the input end of the first voltage regulator tube 204 is a second input end of the voltage regulator circuit, and is connected with a second port of the secondary second winding 502;
the output end of the first voltage regulator tube 204 is connected with the base electrode of the first triode 202;
a first port of the fourth resistor 203 is connected to a collector of the first transistor 202, and a second port of the fourth resistor 203 is connected to a base of the first transistor 202.
The power supply pin VCC of the PWM IC 100 is connected to the output terminal of the third diode 201.
In the embodiment of the present example, the power supply circuit adapted to wide voltage output further includes a fifth capacitor 601 and a sixth capacitor 602 for filtering:
a first port of the fifth capacitor 601 is connected to an output end of the third diode 201, and a second port of the fifth capacitor 601 is connected to a second port of the secondary second winding 502;
a first port of the sixth capacitor 602 is connected to a first port of the secondary first winding 501, and a second port of the sixth capacitor 602 is connected to a second port of the secondary second winding 502.
Further, a PWM signal output pin of the PWM IC 100 is connected to a gate of the second MOS transistor 603;
the ground pin of the PWM IC 100 is connected to the second port of the secondary winding 502.
In the present exemplary embodiment, the transformer further comprises a secondary third winding 503.
By presetting the turns ratio of the secondary first winding 501, the secondary second winding 502 and the secondary third winding 503, after the second rectification half-bridge circuit reduces the output voltage of the secondary second winding 502, a preset intensity voltage is added to the output end of the third diode 201, so that the voltage of the output end of the third diode 201 is higher than the voltage of the input end of the third diode 201, and the effect of reducing the power consumption of the first triode 202 is achieved.
It should be noted that although in the above detailed description several modules or units of the supply circuit are mentioned that accommodate a wide voltage output, this division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Furthermore, in the present exemplary embodiment, there is also provided a power supply method that accommodates wide voltage output, the method being implemented based on the power supply circuit that accommodates wide voltage output as described above, the method including:
by presetting the coil turn ratio of the secondary first winding 501, the secondary second winding 502 and the secondary third winding 503, when the voltages at two ends are lower than a preset voltage after the secondary first winding 501 and the secondary second winding 502 are connected in series, the first rectification half-bridge circuit reduces the voltage of the output voltages of the secondary first winding 501 and the secondary second winding 502, and supplies power to the PWM IC 100 through a voltage stabilizing circuit;
when the voltage at two ends of the secondary first winding 501 and the secondary second winding 502 are connected in series and then is higher than the preset voltage, the second rectification half-bridge circuit reduces the output voltage of the secondary second winding 502 and then supplies power to the PWM IC 100;
by presetting the turns ratio of the secondary first winding 501, the secondary second winding 502 and the secondary third winding 503, after the second rectification half-bridge circuit reduces the output voltage of the secondary second winding 502, the preset intensity voltage of 29.3V (when the output of the flyback system is 20V) is added to the output end of the third diode 201, so that the voltage of the output end of the third diode 201 is higher than that of the input end of the third diode 201, and the purpose of reducing the power consumption of the first triode 202 is achieved
As an example, the number of turns of the secondary first winding 501 is 7TS, the number of turns of the secondary second winding 502 is 6TS, and the number of turns of the secondary third winding 503 is 4TS, based on the above-mentioned coil turns ratio of the secondary first winding 501, the secondary second winding 502, and the secondary third winding 503, the automatic adjustment of the output voltage of the PD charger can be realized, and a stable power input can be provided for the PWM IC 100.
In the embodiment of the present example, when the output voltage of the power supply product is low, the voltage fed back to the first secondary winding 501 and the second secondary winding 502 is reduced by the first resistor 301 and rectified by the first diode 302, and is stabilized by the voltage stabilizing circuit formed by the first triode 202, the first voltage regulator 204, and the fourth resistor 203 to supply power to the PWM IC 100, and the output voltage is low, so that the voltage stabilizing circuit formed by the first triode 202, the first voltage regulator 204, and the fourth resistor 203 is also low in loss due to the low output voltage, and simultaneously, a good VCC supply voltage can be provided to the PWM IC 100. When the output voltage of the power supply product is higher, the starting voltage VCC of the PWM IC 100 comes from: the voltage of the secondary first winding 501 and the secondary second winding 502 is reduced through the first resistor 301, after the first diode 302 is rectified, the voltage of the first triode 202, the first voltage regulator tube 204 and the fourth resistor 203 reaches the anode of the third diode 201 after being stabilized, meanwhile, the voltage of the secondary second winding 502 is reduced through the second resistor 401, the second diode 402 is rectified, the voltage filtered by the first capacitor 403 and the third capacitor 404 reaches the cathode of the third diode 201, the voltage reaches the anode of the third diode 201 through reasonable design of the turns of the secondary first winding 501, the secondary second winding 502 and the value of the first voltage regulator tube 204, at the moment, the voltage of the cathode of the third diode 201 is higher than that of the anode, so that the first triode 202 only has very small current flowing through, even basically cut off, and is isolated by the potential of the third diode 201, therefore, the power consumption of the first triode 202 is extremely low and can be ignored, and the power supply is reduced by the secondary second winding 502 through the second resistor 401, the voltage of the secondary second winding 502 is reduced, The second diode 402 rectifies and the fifth capacitor 601 filters the voltage to the PWM IC 100, thereby providing a stable and reasonable voltage to the PWM IC 100.
It is noted that although the steps of the methods of the present invention are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is only limited by the appended claims.
Claims (8)
1. A power supply circuit adapted for wide voltage output, the power supply circuit adapted for wide voltage output comprising a PWM IC (100), a voltage regulator circuit, a first rectifying half-bridge circuit, a second rectifying half-bridge circuit, and a transformer, wherein:
the transformer comprises a secondary first winding (501) and a secondary second winding (502), wherein a second port of the secondary first winding (501) is connected with a first port of the secondary second winding (502) to realize the series connection of the secondary first winding (501) and the secondary second winding (502);
the input end of the first rectification half-bridge circuit is connected with the first port of the secondary first winding (501), the first output end of the first rectification half-bridge circuit is connected with the first input end of the voltage stabilizing circuit, the second output end of the first rectification half-bridge circuit is connected with the second port of the secondary second winding (502), and the first rectification half-bridge circuit is used for supplying power to the PWM IC (100) after the output voltages of the secondary first winding (501) and the secondary second winding (502) are reduced;
the input end of the second rectification half-bridge circuit is connected with the second port of the secondary first winding (501), the first output end of the second rectification half-bridge circuit is connected with the output end of the third diode (201), the second output end of the second rectification half-bridge circuit is connected with the second port of the secondary second winding (502), and the second rectification half-bridge circuit is used for supplying power to the PWM IC (100) after the output voltage of the secondary second winding (502) is reduced;
the second input end of the voltage stabilizing circuit is connected with the second port of the secondary second winding (502), and the output end of the voltage stabilizing circuit is connected with the input end of the third diode (201);
and a power supply pin of the PWM IC (100) is connected with the output end of the third diode (201).
2. A supply circuit for accommodating wide voltage outputs as claimed in claim 1, wherein the first rectifying half-bridge circuit comprises a first resistor (301), a first diode (302), a second capacitor (303) and a fourth capacitor (304), wherein:
the input end of the first resistor (301) is the input end of the first rectifying half-bridge circuit and is connected with the first port of the secondary first winding (501);
the input end of the first diode (302) is connected with the output end of the first resistor (301), and the output end of the first diode (302) is the first output end of the first rectification half-bridge circuit;
and a first port of the second capacitor (303) connected with the fourth capacitor (304) in parallel is connected with the output end of the first diode (302), and a second port of the second capacitor (303) connected with the fourth capacitor (304) in parallel is a second output end of the first rectifying half-bridge circuit and is connected with a second port of the secondary second winding (502).
3. A supply circuit for accommodating wide voltage outputs as claimed in claim 2, wherein the second rectifying half-bridge circuit comprises a second resistor (401), a second diode (402), a first capacitor (403) and a third capacitor (404), wherein:
the input end of the second resistor (401) is the input end of the second rectifying half-bridge circuit and is connected with the second port of the secondary first winding (501);
the input end of the second diode (402) is connected with the output end of the second resistor (401), and the output end of the second diode (402) is the first output end of the second rectifying half-bridge circuit;
and a first port of the first capacitor (403) connected with the third capacitor (404) in parallel is connected with an output end of the second diode (402), and a second port of the first capacitor (403) connected with the third capacitor (404) in parallel is a second output end of the second rectifying half-bridge circuit and is connected with a second port of the secondary second winding (502).
4. The power supply circuit of claim 3, wherein the regulator circuit comprises a first transistor (202), a fourth resistor (203), and a first regulator tube (204), wherein:
the collector of the first triode (202) is a first input end of the voltage stabilizing circuit and is connected with a first output end of the first rectifying half-bridge circuit;
the emitter electrode of the first triode (202) is the output end of the voltage stabilizing circuit and is connected with the input end of the third diode (201);
the input end of the first voltage regulator tube (204) is a second input end of the voltage stabilizing circuit and is connected with a second port of the secondary second winding (502);
the output end of the first voltage regulator tube (204) is connected with the base electrode of the first triode (202);
the first port of the fourth resistor (203) is connected with the collector of the first triode (202), and the second port of the fourth resistor (203) is connected with the base of the first triode (202).
5. The wide voltage output adaptive supply circuit according to claim 4, wherein the wide voltage output adaptive supply circuit further comprises a fifth capacitor (601) and a sixth capacitor (602) for filtering:
a first port of the fifth capacitor (601) is connected with an output end of a third diode (201), and a second port of the fifth capacitor (601) is connected with a second port of the secondary second winding (502);
a first port of the sixth capacitor (602) is connected to a first port of the secondary first winding (501), and a second port of the sixth capacitor (602) is connected to a second port of the secondary second winding (502).
6. The power supply circuit adapted to wide voltage output according to claim 5, wherein the PWM signal output pin of the PWM IC (100) is connected to the gate of the second MOS transistor (603);
the ground pin of the pulse width modulation integrated circuit chip PWM IC (100) is connected with the second port of the secondary second winding (502).
7. The supply circuit of claim 6 wherein said transformer further comprises a secondary tertiary winding (503):
through presetting the coil turn ratio of the secondary first winding (501), the secondary second winding (502) and the secondary third winding (503), after the second rectification half-bridge circuit reduces the output voltage of the secondary second winding (502), a preset intensity voltage is added to the output end of the third diode (201), so that the voltage of the output end of the third diode (201) is higher than the voltage of the input end of the third diode (201).
8. A power supply method adapted to a wide voltage output, the method being implemented based on the power supply circuit adapted to a wide voltage output of claim 7, the method comprising:
by presetting the coil turn ratio of a secondary first winding (501), a secondary second winding (502) and a secondary third winding (503), when the voltage at two ends of the secondary first winding (501) and the secondary second winding (502) after being connected in series is lower than the preset voltage, a first rectification half-bridge circuit reduces the voltage of the output voltages of the secondary first winding (501) and the secondary second winding (502), and a voltage stabilizing circuit supplies power to the PWM IC (100) after stabilizing the voltage;
when the voltages at the two ends of the secondary first winding (501) and the secondary second winding (502) are connected in series and then are higher than the preset voltage, the second rectification half-bridge circuit reduces the output voltage of the secondary second winding (502) and then supplies power to the PWM IC (100);
through presetting the coil turn ratio of the secondary first winding (501), the secondary second winding (502) and the secondary third winding (503), after the second rectification half-bridge circuit reduces the output voltage of the secondary second winding (502), the preset intensity voltage is added to the output end of the third diode (201), so that the voltage of the output end of the third diode (201) is higher than the voltage of the input end of the third diode (201).
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| CN202210171897.9A CN114244077A (en) | 2022-02-24 | 2022-02-24 | Power supply circuit and power supply method suitable for wide voltage output |
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| CN104010406A (en) * | 2013-02-27 | 2014-08-27 | 台达电子工业股份有限公司 | Led driver |
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| CN206628981U (en) * | 2017-03-01 | 2017-11-10 | 东莞市优琥电子科技有限公司 | Width funtion exports flyback power supply PWM IC power supply circuits |
| CN111082640A (en) * | 2019-12-13 | 2020-04-28 | 广州金升阳科技有限公司 | Positive and negative excitation auxiliary power supply circuit and positive and negative excitation power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104010406A (en) * | 2013-02-27 | 2014-08-27 | 台达电子工业股份有限公司 | Led driver |
| CN106655824A (en) * | 2016-11-07 | 2017-05-10 | 深圳欧陆通电子有限公司 | Switching power source control circuit and switching power source |
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