CN114257095A - A flyback buck circuit that can output voltage of standard amplitude - Google Patents
A flyback buck circuit that can output voltage of standard amplitude Download PDFInfo
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- CN114257095A CN114257095A CN202111164069.4A CN202111164069A CN114257095A CN 114257095 A CN114257095 A CN 114257095A CN 202111164069 A CN202111164069 A CN 202111164069A CN 114257095 A CN114257095 A CN 114257095A
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 36
- 238000004804 winding Methods 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a flyback BUCK circuit capable of outputting voltage with standard amplitude, which comprises a flyback high-frequency transformer (1), wherein the flyback high-frequency transformer (1) is provided with at least two outputs; two of the at least two outputs are provided with center taps by secondary windings of the transformer to form a first output (A) and a second output (B); the output end of the first output (A) is provided with a first voltage stabilizing module (21) which can enable the output end to maintain stable positive standard amplitude voltage, and the output end of the second output (B) is provided with a second voltage stabilizing module (22) which can enable the output end to maintain stable negative standard amplitude voltage. The circuit has stable output and simple structure.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a flyback BUCK circuit capable of outputting a voltage with a standard amplitude.
Background
Currently, when charging an electric vehicle, a vehicle control device determines the maximum supply current of the current power supply equipment by measuring the duty ratio of a PWM signal. According to the national standard GB/T18487.1-2015 of the people's republic of China, the amplitude of a PWM signal for measurement must be a voltage signal of +/-12V, and a common flyback power supply is a positive voltage, cannot provide a-12V amplitude and cannot meet the national standard.
And the output amplitude that present circuit provided leads to output voltage not up to standard very easily because the load is undulant, influences and fills electric pile performance.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a flyback BUCK circuit capable of outputting a voltage with a standard amplitude, which can stably and effectively output a voltage with a standard amplitude, meet the national standard requirements, and have a simple and reliable structure.
In order to achieve the purpose, the technical scheme of the invention is as follows: a flyback BUCK circuit capable of outputting a voltage with a standard amplitude is characterized in that:
the flyback BUCK circuit comprises a flyback high-frequency transformer, and the flyback high-frequency transformer is provided with at least two outputs;
two of the at least two outputs are provided with center taps by a secondary winding of the transformer to form a first output and a second output;
the output end of the first output is provided with a first voltage stabilizing module which can enable the output end to maintain stable positive standard amplitude voltage, and the output end of the second output is provided with a second voltage stabilizing module which can enable the output end to maintain stable negative standard amplitude voltage.
Furthermore, the first voltage stabilizing module comprises a control chip connected with the primary winding of the flyback high-frequency transformer and a feedback component which is positioned at the output end of the first output and used for collecting the output voltage and feeding the output voltage back to the control chip so that the control chip can control the on-off of the primary winding according to the feedback information.
Further, the feedback assembly comprises a first voltage stabilizing component for maintaining the output voltage of the first output to be a positive standard amplitude voltage, and a conducting component connected between the first voltage stabilizing component and the output end of the first output;
the conducting component is also connected with the control chip to feed back the output voltage of the first output to the control chip.
Further, the conducting part is an optical coupler, a light emitting diode side of the optical coupler is connected between an output end of the first output and the first voltage stabilizing part, and a light receiver side is connected with a feedback end of the control chip.
Furthermore, the control chip is a power chip with an MOS tube inside, and the power chip is connected with the primary winding through the MOS tube and controls the on-off of the primary winding by controlling the on-off of the MOS tube.
Furthermore, the second voltage stabilizing module comprises a second voltage stabilizing part connected with the output end of the second output, and a voltage dividing network connected with the reference voltage end of the second voltage stabilizing part and maintaining the output voltage of the second output to be negative standard amplitude in a voltage dividing mode.
Further, the voltage dividing network comprises a first resistor and a second resistor which are connected in series with an output end of the second output, and a reference voltage end of the second voltage stabilizing component is connected between the first resistor and the second resistor.
Further, the first voltage stabilizing part and the second voltage stabilizing part are both 431 voltage stabilizers.
Further, the circuit also includes a third output isolated and independent from the first and second outputs.
Further, the normalized amplitude is ± 12V.
Compared with the prior art, the invention has the advantages that:
a center tap is arranged on a secondary winding of the circuit, so that a reference ground is generated, and the problem that the conventional charging pile cannot output negative voltage is solved; the voltage of output standard amplitude can effectively be guaranteed in voltage stabilization module's setting to the messenger fills electric pile and accords with the national standard requirement, and the design of third output makes this electric pile that fills have more functions, thereby improves the suitability that fills electric pile, and this structure sets up simply, easily realizes, and stability is high, has improved the performance of filling electric pile.
Drawings
FIG. 1 shows a schematic diagram of a display device capable of outputtingStandard of meritA circuit schematic of a flyback BUCK circuit for voltages of magnitude.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
FIG. 1 shows that the present application can outputStandard of meritPreferred embodiments of flyback BUCK circuits for voltages of magnitude. The flyback BUCK circuit capable of outputting the voltage with the standard amplitude comprises a flyback high-frequency transformer 1, wherein the flyback high-frequency transformer 1 is provided with at least two outputs, and two of the at least two outputs form a first output A and a second output B by arranging a center tap on a secondary winding of the transformer. The output end of the first output A is provided with a first voltage stabilizing module 21 which can enable the output end to maintain stable positive standard amplitude voltage, and the output end of the second output B is provided with a second voltage stabilizing module 22 which can enable the output end to maintain stable negative standard amplitude voltage.
As shown in fig. 1, the first voltage stabilizing module 21 includes a control chip 211 connected to the primary winding (pin 1/3) of the flyback high-frequency transformer 1, and a feedback component 212 located at the output end of the first output a to collect the output voltage and feed it back to the control chip 211, so that the control chip 211 controls the on/off of the primary winding according to the feedback information.
The feedback component 212 includes a first voltage stabilizing part 2121 for maintaining the output voltage of the first output a as a positive standard amplitude voltage, a conducting part 2122 connected between the first voltage stabilizing part 2121 and the output terminal of the first output a, and the conducting part 2122 is further connected to the control chip 211 for feeding back the output voltage of the first output a to the control chip 211.
In the present embodiment, the conducting part 2122 is an optical coupler E7, the light emitting diode side of the optical coupler E7 is connected between the output end of the first output a and the first voltage stabilizing part 2121, and the light receiver side is connected to the feedback end FB of the control chip 211.
The control chip 211 is a power chip N17 with a built-in MOS transistor, and the power chip N17 is connected with the primary winding (1/3 pin) through the MOS transistor and controls the on/off of the primary winding (1/3 pin) by controlling the on/off of the MOS transistor.
When the voltage of the output end of the first output A changes, the current flowing through E7 changes, the current value fed back to the FB end also changes, the input power chip N17 controls the on-off of the D, S, GND three pins of the MOS tube according to the change of the current value so as to control the on-off of the primary winding (1/3 pin), and therefore the output is adjusted to be maintained at the standard amplitude.
The second voltage regulation module 22 includes a second voltage regulation component 221 connected to the output terminal of the second output B, and a voltage division network 222 connected to the reference voltage terminal 1 pin of the second voltage regulation component 221 and maintaining the output voltage of the second output B to be a negative standard amplitude value by voltage division.
The voltage divider network 222 includes a first resistor and a second resistor connected in series at the output terminal of the second output B, and the reference voltage terminal of the second voltage stabilizer is connected between the first resistor R215 and the second resistor R216. The reference voltage of the voltage stabilizing part is not changed, and the resistance values of R215 and R216 can be determined according to the magnitude of the required amplitude, so that the output voltage is kept near the standard amplitude.
In this embodiment, the first and second voltage stabilization parts 2121 and 221 are both 431 voltage regulators. Meanwhile, the circuit also comprises a third output C which is isolated and independent from the first output A/B and the second output A/B, and the insulation withstand voltage can be ensured to be more than 3KV, so that the whole controller is not influenced in case of damage of the communication circuit. Meanwhile, the voltage output by the third output C CAN be used for circuits such as a CAN (controller area network), a card swiping module and a 485 circuit, and external static electricity and interference are prevented.
The first output A regulates output voltage through the optocoupler 431 and a loop, and ensures positive 12V voltage output for use of parts such as an MCU (microprogrammed control unit), a relay and the like, and the second output B directly realizes stable output of negative 12V voltage through the 431 part and a voltage division network so as to meet standard requirements and be used for being physically connected with an electric vehicle.
The circuit is briefly described below:
1. the input alternating current passes through a wire-wound safety resistor (used for preventing surge), passes through pi-type filtering (the pi-type filtering is mainly used for meeting EMC), and then is rectified and filtered into direct current voltage, and electrolytic capacitors are connected in series to ensure that the input voltage reaches 380V without damage.
2. The direct current voltage is divided by R119, R122, R125, R129 and R130, a voltage value is collected and fed back to the power chip N17, and whether the output voltage exceeds a limit value is controlled.
3. An MOS tube is arranged in a power chip N17, a primary side loop is formed by a primary side winding of the flyback high-frequency transformer, an MOS tube arranged in the power chip and current-limiting resistors R139 and R140, and three groups of load outputs are output according to the flyback principle of the transformer.
4. The 7/8/9 pins of the transformer winding are referenced to ground by an 8-pin center tap, which can meet the standard requirement of plus or minus 12V (the voltage between 7 pins and 9 pins is 24V, but when the voltage is locally changed to 8 pins, the 7 pins and 8 pins are plus 12V, and the 9 pins and 8 pins are minus 12V).
5. Because the error range of the output voltage is within 0.6V, the positive 12V forms a loop through the optocoupler and the 431, and the positive 12V voltage is ensured to be unchanged by feeding back to the primary side loop when the load changes. Since the load of the negative 12V is small, the output of the negative 12V is ensured to be stable by 431 partial pressure.
6. According to the scheme, a common flyback BUCK chip is adopted, the transformer outputs three windings, and the error of outputting positive and negative 12V is smaller than 0.6V through loop design and voltage stabilizing circuit design.
The working circuit is as follows:
(1) the positive 12V positive half cycle is conducted through a 7 pin → VD14 Schottky diode at the same name end (R127 and C97 form an RC circuit to reduce RE harassment) → CE6 electrolytic capacitor stores energy and synchronously provides energy for a load (the parallel connection of C98 is used for reducing ESR) → load resistor R336 is conducted (when an external load is disconnected, the resistor can play a role in stabilizing the cross regulation rate of the output of the other two windings);
(2) the CE6 electrolytic capacitor supplies energy to the load (parallel C98 is to reduce ESR) → the load resistor R336 is turned on (when the external load is disconnected, the resistor can play a role in stabilizing the cross regulation rate of the outputs of the other two windings);
(3) the negative 12V positive half cycle stores energy through a homonymous terminal 8 pin → CE4 electrolytic capacitor and synchronously provides energy for a load (parallel connection C90 is used for reducing ESR) → 431 conduction, and outputs-12V [ 12K Ω/3.1K Ω) +1 ] 2.5 ═ 12.17V → VD11 schottky diode conduction through a voltage dividing resistor (R123 and C91 form an RC circuit to reduce RE disturbance) → resistor R217 is a current limiting resistor, so that 431 is prevented from directly breaking through;
(4) the negative half period of 12V and the negative half period of CE4 is that the electrolytic capacitor supplies energy to the load (parallel connection of C90 is used for reducing ESR) → 431 conduction, and the output of-12V (12K omega/3.1K omega) + 1) is that 2.5 is 12.17V → VD11 Schottky diodes are conducted through a voltage dividing resistor (R123 and C91 form an RC circuit to reduce RE disturbance);
the output amplitude can be within the 5% error range of the standard amplitude, namely 12V +/-0.6V, when the 12V voltage is changed, the 12V voltage is compared with the reference voltage 2.5V of 431 and fed back to the optocoupler to correct the duty ratio of the primary side loop so as to achieve the purpose of adjusting the output voltage; the reference voltage error of 431 is 0.8%, which can meet the standard requirement.
Therefore, a center tap is arranged on a secondary winding of the circuit, so that a reference ground is generated, and the problem that the conventional charging pile cannot output negative voltage is solved; the voltage of output standard amplitude can effectively be guaranteed in voltage stabilization module's setting to the messenger fills electric pile and accords with the national standard requirement, and the design of third output makes this electric pile that fills have more functions, thereby improves the suitability that fills electric pile, and this structure sets up simply, easily realizes, and stability is high, has improved the performance of filling electric pile. .
While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A flyback BUCK circuit capable of outputting a voltage with a standard amplitude is characterized in that:
the flyback BUCK circuit comprises a flyback high-frequency transformer (1), wherein the flyback high-frequency transformer (1) is provided with at least two outputs;
two of the at least two outputs are provided with center taps by secondary windings of the transformer to form a first output (A) and a second output (B);
the output end of the first output (A) is provided with a first voltage stabilizing module (21) which can enable the output end to maintain stable positive standard amplitude voltage, and the output end of the second output (B) is provided with a second voltage stabilizing module (22) which can enable the output end to maintain stable negative standard amplitude voltage.
2. The flyback BUCK circuit of claim 1, wherein the flyback BUCK circuit is capable of outputting a standard magnitude voltage, and further comprises:
the first voltage stabilizing module (21) comprises a control chip (211) connected with a primary winding of the flyback high-frequency transformer (1) and a feedback component (212) which is positioned at the output end of the first output (A) and used for collecting output voltage and feeding the output voltage back to the control chip (211) so that the control chip (211) can control the on-off of the primary winding according to feedback information.
3. The flyback BUCK circuit of claim 2, wherein the flyback BUCK circuit is capable of outputting a standard magnitude voltage, and further comprises:
the feedback assembly (212) comprises a first voltage stabilizing part (2121) for maintaining the output voltage of the first output (A) to be a positive standard amplitude voltage, and a conducting part (2122) connected between the first voltage stabilizing part (2121) and the output end of the first output (A);
the conducting part (2122) is also connected with the control chip (211) to feed back the output voltage of the first output (A) to the control chip (211).
4. The flyback BUCK circuit of claim 3, wherein the flyback BUCK circuit is capable of outputting a standard magnitude voltage, and further comprises:
the conducting part (2122) is an optical coupler (E7), the light emitting diode side of the optical coupler (E7) is connected between the output end of the first output (A) and the first voltage stabilizing part (2121), and the light receiver side is connected with the feedback end of the control chip (211).
5. The flyback BUCK circuit capable of outputting a voltage with a standard amplitude as claimed in claim 4, wherein:
the control chip (211) is a power chip (N17) with a built-in MOS tube, and the power chip (N17) is connected with the primary winding through the MOS tube and controls the on-off of the primary winding by controlling the on-off of the MOS tube.
6. The flyback BUCK circuit of claim 3, wherein the flyback BUCK circuit is capable of outputting a standard magnitude voltage, and further comprises:
the second voltage stabilizing module (22) comprises a second voltage stabilizing part (221) connected with the output end of the second output (B), and a voltage dividing network (222) which is connected with the reference voltage end of the second voltage stabilizing part (221) and maintains the output voltage of the second output (B) to be negative standard amplitude in a voltage dividing mode.
7. The flyback BUCK circuit capable of outputting a voltage with a standard amplitude as claimed in claim 6, wherein:
the voltage dividing network (222) includes a first resistor (R215) and a second resistor (R216) connected in series to an output terminal of the second output (B), and a reference voltage terminal of the second voltage stabilizing part (221) is connected between the first resistor (R215) and the second resistor (R216).
8. The flyback BUCK circuit capable of outputting a voltage with a standard amplitude as claimed in claim 6, wherein:
the first voltage stabilizing part (2121) and the second voltage stabilizing part (221) are both 431 voltage stabilizers.
9. The flyback BUCK circuit capable of outputting a voltage with a standard amplitude as claimed in claim 6, wherein:
the circuit further comprises a third output (C) isolated and independent from the first and second outputs.
10. The flyback BUCK circuit capable of outputting a voltage with a standard amplitude as claimed in claim 6, wherein:
the normalized amplitude is ± 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111164069.4A CN114257095A (en) | 2021-09-30 | 2021-09-30 | A flyback buck circuit that can output voltage of standard amplitude |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111164069.4A CN114257095A (en) | 2021-09-30 | 2021-09-30 | A flyback buck circuit that can output voltage of standard amplitude |
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| CN114257095A true CN114257095A (en) | 2022-03-29 |
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| CN202111164069.4A Pending CN114257095A (en) | 2021-09-30 | 2021-09-30 | A flyback buck circuit that can output voltage of standard amplitude |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008061371A (en) * | 2006-08-31 | 2008-03-13 | Toko Inc | Self-excited resonant switching power supply |
| CN204794705U (en) * | 2015-07-17 | 2015-11-18 | 西安科技大学 | Multiplexed output flyback converter of uninterrupted power supply |
| CN204906189U (en) * | 2015-09-14 | 2015-12-23 | 上海追日电气有限公司 | Low pressure high frequency switching power supply circuit |
| CN216390809U (en) * | 2021-09-30 | 2022-04-26 | 宁波三星智能电气有限公司 | Flyback BUCK circuit capable of outputting voltage with standard amplitude |
-
2021
- 2021-09-30 CN CN202111164069.4A patent/CN114257095A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008061371A (en) * | 2006-08-31 | 2008-03-13 | Toko Inc | Self-excited resonant switching power supply |
| CN204794705U (en) * | 2015-07-17 | 2015-11-18 | 西安科技大学 | Multiplexed output flyback converter of uninterrupted power supply |
| CN204906189U (en) * | 2015-09-14 | 2015-12-23 | 上海追日电气有限公司 | Low pressure high frequency switching power supply circuit |
| CN216390809U (en) * | 2021-09-30 | 2022-04-26 | 宁波三星智能电气有限公司 | Flyback BUCK circuit capable of outputting voltage with standard amplitude |
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