CN111130327A - Low-ripple direct-current voltage reduction circuit and voltage reduction method - Google Patents
Low-ripple direct-current voltage reduction circuit and voltage reduction method Download PDFInfo
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- CN111130327A CN111130327A CN201911405888.6A CN201911405888A CN111130327A CN 111130327 A CN111130327 A CN 111130327A CN 201911405888 A CN201911405888 A CN 201911405888A CN 111130327 A CN111130327 A CN 111130327A
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to the technical field of voltage reduction circuits, and discloses a low-ripple direct-current voltage reduction circuit and a voltage reduction method, wherein the low-ripple direct-current voltage reduction circuit adopted by the method comprises the following steps: two energy storage inductors L1 and L2, two MOS tubes V1 and V2 and a control chip; a pin 1 of the first MOS transistor V1 is connected with an input terminal, a pin 2 is connected with a pin 1 of the energy storage inductor L1, a pin 3 is connected with a PWM1 output pin of the control chip, a pin 2 of the energy storage inductor L1 is connected with an output terminal, a pin 1 of the diode D1 is connected with a pin 1 of the inductor L1, a pin 2 is connected with negative terminals of the input and the output, and a pin 1 and a pin 2 of the output filter capacitor C1 are connected with +, -terminals of the output; the connection mode of the second MOS tube V2, the energy storage inductor L2 and the diode D2 is consistent with that of the first MOS tube and is connected in parallel. The invention solves the problem that the BUCK voltage reduction circuit has larger ripple voltage, and meanwhile, the circuit has the advantages of simple debugging, convenient testing, high reliability and strong practicability; has wide application prospect in the aspect of voltage reduction circuits.
Description
Technical Field
The invention relates to the technical field of voltage reduction circuits, in particular to a low-ripple direct-current voltage reduction circuit and a voltage reduction method.
Background
The voltage reduction circuit is a common circuit of the switching power supply. A general non-isolated direct current voltage reduction circuit adopts a BUCK circuit, the circuit is simple and easy to debug, devices are few, the efficiency is high, and the problem of large output voltage ripples exists.
Disclosure of Invention
The invention aims to provide a low-ripple direct-current voltage reduction circuit and a voltage reduction method, and particularly provides a direct-current voltage reduction circuit which is not isolated, is simple in design, easy to debug and high in reliability.
In order to achieve the purpose, the invention adopts the following scheme:
a low-ripple dc buck circuit, comprising: the power supply comprises two energy storage inductors L1 and L2, two MOS tubes V1 and V2, two diodes D1 and D2, an output filter capacitor C1 and a control chip; a pin 1 of the first MOS transistor V1 is connected with an input terminal, a pin 2 is connected with a pin 1 of the energy storage inductor L1, a pin 3 is connected with a PWM1 output pin of the control chip, a pin 2 of the energy storage inductor L1 is connected with an output terminal, a pin 1 of the diode D1 is connected with a pin 1 of the inductor L1, a pin 2 is connected with negative terminals of the input and the output, and a pin 1 and a pin 2 of the output filter capacitor C1 are connected with +, -terminals of the output;
the connection mode of the second MOS tube V2, the energy storage inductor L2 and the diode D2 is the same as that of the first MOS tube V1, the energy storage inductor L1 and the diode D1, and the second MOS tube V1, the energy storage inductor L1 and the diode D1 are connected in parallel; and the pin V23 of the second MOS transistor is connected with the output pin of the PWM2 of the control chip.
A DC step-down circuit with low ripple and a step-down method thereof comprise the following steps:
when the input and output are direct-current voltages and the voltage reduction circuit is not isolated, external control signals PWM1 and PWM2 are respectively input to MOS transistors V1 and V2, the control signal PWM1 and the control signal PWM2 are opposite-phase signals, two power MOS transistors V1 and V2 are respectively conducted, and the output filter capacitor C1 is charged through energy storage inductors L1 and L2;
when the two MOS tubes V1 and V2 are not conducted, the output end freewheels through diodes D1 and D2; in this way, the on-time of the MOS transistors V1 and V2 is greatly increased, i.e. the sum of the on-time of V1 and V2, the output current is in a "gentle" state, so that the output current ripple is greatly reduced.
By adopting the technical scheme, the invention has the following advantages:
a low-ripple direct-current voltage reduction circuit and a voltage reduction method form a simple low-ripple voltage reduction circuit through two energy storage inductors, two diodes, two MOS (metal oxide semiconductor) tubes, a capacitor and a chip. Namely a simple and reliable low ripple voltage reduction circuit, in particular a non-isolated direct current voltage reduction circuit.
The invention solves the problem that the BUCK voltage reduction circuit has larger ripple voltage, and meanwhile, the circuit has the advantages of simple debugging, convenient testing, high reliability and strong practicability; has wide application prospect in the aspect of voltage reduction circuits.
Drawings
Fig. 1 is a schematic diagram of a low ripple dc buck circuit.
Detailed Description
This patent is further described below with reference to figure 1.
The scheme of the invention is shown in fig. 1, and the low-ripple direct-current voltage reduction circuit comprises: the power supply comprises two energy storage inductors L1 and L2, two MOS tubes V1 and V2, two diodes D1 and D2, an output filter capacitor C1 and a control chip; a pin 1 of the first MOS transistor V1 is connected with an input terminal, a pin 2 is connected with a pin 1 of the energy storage inductor L1, a pin 3 is connected with a PWM1 output pin of the control chip, a pin 2 of the energy storage inductor L1 is connected with an output terminal, a pin 1 of the diode D1 is connected with a pin 1 of the inductor L1, a pin 2 is connected with negative terminals of the input and the output, and a pin 1 and a pin 2 of the output filter capacitor C1 are connected with +, -terminals of the output;
the connection mode of the second MOS tube V2, the energy storage inductor L2 and the diode D2 is the same as that of the first MOS tube V1, the energy storage inductor L1 and the diode D1, and the second MOS tube V1, the energy storage inductor L1 and the diode D1 are connected in parallel; and the pin V23 of the second MOS transistor is connected with the output pin of the PWM2 of the control chip. The model of the control chip is SG 3525A.
A DC step-down circuit with low ripple and a step-down method thereof comprise the following steps:
when the input and output are direct-current voltages and the voltage reduction circuit is not isolated, external control signals PWM1 and PWM2 are respectively input to MOS transistors V1 and V2, the control signal PWM1 and the control signal PWM2 are opposite-phase signals, two power MOS transistors V1 and V2 are respectively conducted, and the output filter capacitor C1 is charged through energy storage inductors L1 and L2;
when the two MOS tubes V1 and V2 are not conducted, the output end freewheels through diodes D1 and D2; in this way, the on-time of the MOS transistors V1 and V2 is greatly increased, i.e. the sum of the on-time of V1 and V2, the output current is in a "gentle" state, so that the output current ripple is greatly reduced.
The low-ripple voltage reduction circuit is characterized in that L1 and L2 are energy storage inductors, V1 and V2 are two MOS (metal oxide semiconductor) tubes, D1 and D2 are two diodes, and C1 is an output filter capacitor; a pin 1 of the MOS transistor V1 is connected with an input +, a pin 2 is connected with a pin 1 of the inductor L1, a pin 3 is connected with output pins of PWM1 and PWM2 of the control chip, a pin 2 of the inductor L1 is connected with an output +, a pin 1 of the diode D1 is connected with a pin 1 of the inductor L1, a pin 2 is connected with negative terminals of the input and the output, and a pin 1 and a pin 2 of the capacitor C1 are connected with + and-terminals of the output; the MOS tube V2, the inductor L2 and the diode D2 are connected in the same way and are connected in parallel with V1, L1 and D1.
Claims (2)
1. A DC step-down circuit with low ripple is characterized in that: the method comprises the following steps: the power supply comprises two energy storage inductors L1 and L2, two MOS tubes V1 and V2, two diodes D1 and D2, an output filter capacitor C1 and a control chip; a pin 1 of the first MOS transistor V1 is connected with an input terminal, a pin 2 is connected with a pin 1 of the energy storage inductor L1, a pin 3 is connected with a PWM1 output pin of the control chip, a pin 2 of the energy storage inductor L1 is connected with an output terminal, a pin 1 of the diode D1 is connected with a pin 1 of the inductor L1, a pin 2 is connected with negative terminals of the input and the output, and a pin 1 and a pin 2 of the output filter capacitor C1 are connected with +, -terminals of the output;
the connection mode of the second MOS tube V2, the energy storage inductor L2 and the diode D2 is the same as that of the first MOS tube V1, the energy storage inductor L1 and the diode D1, and the second MOS tube V1, the energy storage inductor L1 and the diode D1 are connected in parallel; and the pin V23 of the second MOS transistor is connected with the output pin of the PWM2 of the control chip.
2. The dc voltage reduction circuit with low ripple and the voltage reduction method according to claim 1, wherein: the method comprises the following steps:
when the input and output are direct-current voltages and the voltage reduction circuit is not isolated, external control signals PWM1 and PWM2 are respectively input to MOS transistors V1 and V2, the control signal PWM1 and the control signal PWM2 are opposite-phase signals, two power MOS transistors V1 and V2 are respectively conducted, and the output filter capacitor C1 is charged through energy storage inductors L1 and L2;
when the two MOS tubes V1 and V2 are not conducted, the output end freewheels through diodes D1 and D2; in this way, the on-time of the MOS transistors V1 and V2 is greatly increased, i.e. the sum of the on-time of V1 and V2, the output current is in a "gentle" state, so that the output current ripple is greatly reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911405888.6A CN111130327A (en) | 2019-12-31 | 2019-12-31 | Low-ripple direct-current voltage reduction circuit and voltage reduction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911405888.6A CN111130327A (en) | 2019-12-31 | 2019-12-31 | Low-ripple direct-current voltage reduction circuit and voltage reduction method |
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| CN111130327A true CN111130327A (en) | 2020-05-08 |
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| CN201911405888.6A Pending CN111130327A (en) | 2019-12-31 | 2019-12-31 | Low-ripple direct-current voltage reduction circuit and voltage reduction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000358363A (en) * | 1999-05-17 | 2000-12-26 | Multipower Inc | Apparatus and method for multi-phase voltage conversion |
| CN203289128U (en) * | 2013-04-10 | 2013-11-13 | 北京科诺伟业科技有限公司 | Photovoltaic charging controller |
| CN203645383U (en) * | 2013-10-28 | 2014-06-11 | 江苏英伟特新能源技术有限公司 | Low current ripple solar energy charging device base on interlace topology |
| US20160329811A1 (en) * | 2014-01-15 | 2016-11-10 | Abb Inc. | Interleaved multi-channel, multi-level, multi-quadrant dc-dc converters |
| CN107863882A (en) * | 2017-11-30 | 2018-03-30 | 安徽维新能源技术有限公司 | Buck converter BUCK circuits |
-
2019
- 2019-12-31 CN CN201911405888.6A patent/CN111130327A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000358363A (en) * | 1999-05-17 | 2000-12-26 | Multipower Inc | Apparatus and method for multi-phase voltage conversion |
| CN203289128U (en) * | 2013-04-10 | 2013-11-13 | 北京科诺伟业科技有限公司 | Photovoltaic charging controller |
| CN203645383U (en) * | 2013-10-28 | 2014-06-11 | 江苏英伟特新能源技术有限公司 | Low current ripple solar energy charging device base on interlace topology |
| US20160329811A1 (en) * | 2014-01-15 | 2016-11-10 | Abb Inc. | Interleaved multi-channel, multi-level, multi-quadrant dc-dc converters |
| CN107863882A (en) * | 2017-11-30 | 2018-03-30 | 安徽维新能源技术有限公司 | Buck converter BUCK circuits |
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Application publication date: 20200508 |