CN107565824A - A kind of electrical energy conversion circuit suitable for wide input voltage - Google Patents
A kind of electrical energy conversion circuit suitable for wide input voltage Download PDFInfo
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Abstract
The invention discloses a kind of electrical energy conversion circuit suitable for wide input voltage, it is related to power circuit design field.The circuit being made up of L1, Q1, C2, S1 and D1, under different input Vin_1 voltage conditions, form different circuits, realization can rise to output voltage under low pressure input condition required voltage, avoid the electric current under lower pressure excessive, efficiency when the problem of conversion efficiency is too low, improving the conversion efficiency of change-over circuit, while not influenceing high input voltage.Solve the design bottleneck of power supply changeover device under wide input condition, enormously simplify design difficulty, the conversion efficiency under balanced high-low pressure input condition, the thermal losses of product in itself is reduced, so as to reduce the pollution of environment；Also solve in the prior art, using two-stage change-over circuit whole efficiency improve it is limited, and it is more complex and expensive the problem of.
Description
Technical Field
The invention relates to the technical field of power supply circuit design, in particular to an electric energy conversion circuit suitable for wide input voltage.
Background
For an AC/DC (alternating current to direct current) circuit, because the power grid voltage is different between different countries or regions, in order to give consideration to the application of different countries or regions, the input voltage range needs to be designed to be wider; similarly, in a DC/DC (direct current to direct current) circuit, it is necessary to consider a case where a fluctuation range of an input voltage is relatively wide in different applications or a fixed application, and therefore, it is necessary to design a relatively wide input voltage range. In other words, in an AC/DC or DC/DC switching power supply or converter circuit, a phenomenon that an input voltage is relatively wide in a designed circuit generally occurs.
In the case of a wide range of input voltages, when the input voltage is relatively low, the current flowing through each device in the subsequent circuit is much larger than that in the case of a high input voltage, and the larger current causes a larger circuit loss, thereby reducing the conversion efficiency of the power supply circuit. Therefore, when designing the optimal design of the power conversion circuit, the design of compromise under high and low voltages is generally considered comprehensively, so that redundancy exists in the design.
At present, in order to solve the problem of low conversion efficiency at low voltage input, a two-stage circuit is generally adopted, that is, a one-stage boosting circuit is firstly adopted, the voltage of an input voltage in a wider range is boosted by the boosting circuit, and the boosted voltage is maintained at a constant value or in a range narrower than the range of the input voltage; then the voltage is converted into the voltage which is actually needed by the second-stage circuit, so that for the second-stage circuit, the input voltage is the output voltage of the first-stage circuit, the voltage is higher than the original input voltage, and the range of the voltage is relatively stable or relatively smaller, so that the conversion efficiency is higher; however, this circuit has two disadvantages: firstly, because all energy is converted twice, the overall efficiency of the two-stage circuit is improved limitedly; and secondly, compared with a first-stage circuit, the two-stage circuit is more complex and higher in cost.
Disclosure of Invention
It is an object of the present invention to provide a power conversion circuit suitable for wide input voltage, thereby solving the aforementioned problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a power conversion circuit adapted for wide input voltage comprising: c1, L1, Q1, C2, S1 and D1, wherein input voltage is connected to two ends of C1, output voltage is connected to two ends of Q1, C1 is connected with Q1 in series and then connected with L1 in parallel, C2 and S1 are connected with D1 in parallel and then connected with L1 in parallel;
when the input voltage is low voltage, the S1 is normally open, and the Q1, the L1, the C2 and the D1 form a power conversion circuit;
when the input voltage is high voltage, Q1 is normally open, and S1 is closed;
wherein,
c1 and C2 are electrolytic or other material type energy storage media;
l1 is a medium of inductance or other inductive material;
q1 is a metal oxide semiconductor field effect transistor or other power switching device;
s1 is any switching device;
d1 is a metal oxide semiconductor field effect transistor or other power switching device.
The invention has the beneficial effects that: according to the electric energy conversion circuit suitable for wide input voltage, different circuits are formed through the circuit composed of the L1, the Q1, the C2, the S1 and the D1 under different input Vin _1 voltage conditions, output voltage can be increased to required voltage under the low-voltage input condition, the problems that current is too large and conversion efficiency is too low under the low-voltage condition are solved, conversion efficiency of the conversion circuit is improved, and meanwhile efficiency of high-voltage input is not affected. The design bottleneck of the power converter under the wide input condition is solved, the design difficulty is greatly simplified, the conversion efficiency under the high-low voltage input condition is balanced, and the heat loss of the product is reduced, so that the environmental pollution is reduced; the problems that in the prior art, the overall efficiency improvement by adopting a two-stage conversion circuit is limited, and the two-stage conversion circuit is more complex and higher in cost are solved.
Drawings
FIG. 1 is a diagram of a power conversion circuit suitable for wide input voltages;
fig. 2 is a prior art flyback circuit diagram;
fig. 3 is a power conversion circuit employed in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a power conversion circuit suitable for a wide input voltage, including: c1, L1, Q1, C2, S1 and D1, wherein input voltage is connected to two ends of C1, output voltage is connected to two ends of Q1, C1 is connected with Q1 in series and then connected with L1 in parallel, C2 and S1 are connected with D1 in parallel and then connected with L1 in parallel;
when the input voltage is low voltage, the S1 is normally open, and the Q1, the L1, the C2 and the D1 form a power conversion circuit;
when the input voltage is high voltage, Q1 is normally open, and S1 is closed;
wherein,
c1 and C2 are electrolytic or other material type energy storage media;
l1 is a medium of inductance or other inductive material;
q1 is a metal oxide semiconductor field effect transistor or other power switching device;
s1 is any switching device;
d1 is a metal oxide semiconductor field effect transistor or other power switching device.
The electric energy conversion circuit with the structure has the working principle that:
under the condition that Vin _1 is input at low voltage, the electric energy conversion circuit provided by the embodiment is as follows: s1 is normally open, Q1, L1, C2 and D1 form a power conversion circuit, voltage is generated on C2 to generate V2, and output voltage Vin _2 is equal to Vin _1+ V2, so that the purpose of improving input voltage is achieved.
Under the condition that Vin _1 is input at high voltage, the electric energy conversion circuit provided by the embodiment is as follows: q1 is normally open, S1 is closed, and the output voltage Vin _2 is equal to Vin _ 1.
It can be seen that, in the above circuit, no matter under low-voltage input condition or high-voltage input condition, the output voltage is higher, and then the input voltage is higher for the back-end circuit, so that, under high-voltage input, the current flowing through each device in the circuit is not too large, and therefore, the circuit loss is not too large, and the problems that under wide-range voltage input condition, after passing through the conversion circuit, the loss is large, and during the design of the conversion circuit, the current needs to be considered in compromise, that is, the design bottleneck of the power converter under wide-input condition is solved, the design difficulty is greatly simplified, the conversion efficiency under high-low voltage input condition is equalized, the heat loss of the product is reduced, and the environmental pollution is reduced; the conversion circuit provided by the invention can boost the voltage to the necessary voltage under low-voltage input, thereby improving the conversion efficiency of the conversion circuit without influencing the efficiency of high-voltage input.
The specific embodiment is as follows:
as shown in fig. 2, in a conventional flyback circuit, under low-voltage input, the loss of the circuit is large, the voltage at C1 is small, and the current is large under the same power, which results in low power efficiency, so that a first-stage circuit is generally added at present, for example, a power conversion circuit in fig. 3 raises the C2 capacitor to a high voltage, at this time, the current flowing through a Q2 transistor is reduced, the loss of the flyback circuit is reduced, but the added L1, Q1 and D1 are connected in series to the flyback circuit, so that the cost is increased, and the efficiency improvement is also affected by the power conversion circuit.
According to the invention, the voltage of Vin _2 is controlled by the conversion circuit shown in FIG. 1, and different circuits are formed by performing different action behaviors through the circuit composed of L1, Q1, C2, S1 and D1 under different input Vin _1 voltage conditions, so that the output voltage can be increased to the required voltage under the low-voltage input condition, and the problems of overlarge current and overlow conversion efficiency under the low-voltage condition are avoided.
Specifically, under the condition that the Vin _1 input is at a low-voltage input, S1 is kept normally open in the circuit, then Q1, L1, C2 and D1 form a power conversion circuit, a V2 voltage is generated on C2, and at the moment, the DC/DC input voltage Vin _2 is equal to Vin _1+ V2, so that the purpose of improving the input voltage is achieved. Under the condition that Vin _1 inputs high voltage, Q1 is kept normally open, S1 is kept closed, and the DC/DC input voltage Vin _2 is equal to Vin _ 1.
In addition, as shown in fig. 2, in the case of a conventional flyback circuit (composed of Q2, T1, D2 and C2) with the same Vo load, and with Vin _1 at a low input voltage, the current flowing through T1 and Q2 is much larger than that flowing through Vin _1 at a high input voltage, so that the design of the power conversion circuit is designed to be optimal, and the design is redundant due to the fact that the design is compromised under the high and low voltages.
When the power switching circuit provided by the invention is used, the optimal point can be designed under the high-voltage input condition when the rear circuit is designed, so that the simplified design is realized, and the efficiency of the rear circuit under the wide input condition is improved.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained: according to the electric energy conversion circuit suitable for wide input voltage, different circuits are formed through the circuit composed of the L1, the Q1, the C2, the S1 and the D1 under different input Vin _1 voltage conditions, output voltage can be increased to required voltage under the low-voltage input condition, the problems that current is too large and conversion efficiency is too low under the low-voltage condition are solved, conversion efficiency of the conversion circuit is improved, and meanwhile efficiency of high-voltage input is not affected. The design bottleneck of the power converter under the wide input condition is solved, the design difficulty is greatly simplified, the conversion efficiency under the high-low voltage input condition is balanced, and the heat loss of the product is reduced, so that the environmental pollution is reduced; the problems that in the prior art, the overall efficiency improvement by adopting a two-stage conversion circuit is limited, and the two-stage conversion circuit is more complex and higher in cost are solved.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It should be understood by those skilled in the art that the timing sequence of the method steps provided in the above embodiments may be adaptively adjusted according to actual situations, or may be concurrently performed according to actual situations.
All or part of the steps in the methods according to the above embodiments may be implemented by a program instructing related hardware, where the program may be stored in a storage medium readable by a computer device and used to execute all or part of the steps in the methods according to the above embodiments. The computer device, for example: personal computer, server, network equipment, intelligent mobile terminal, intelligent home equipment, wearable intelligent equipment, vehicle-mounted intelligent equipment and the like; the storage medium, for example: RAM, ROM, magnetic disk, magnetic tape, optical disk, flash memory, U disk, removable hard disk, memory card, memory stick, network server storage, network cloud storage, etc.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (1)
1. A power conversion circuit adapted for wide input voltage, comprising: c1, L1, Q1, C2, S1 and D1, wherein input voltage is connected to two ends of C1, output voltage is connected to two ends of Q1, C1 is connected with Q1 in series and then connected with L1 in parallel, C2 and S1 are connected with D1 in parallel and then connected with L1 in parallel;
when the input voltage is low voltage, the S1 is normally open, and the Q1, the L1, the C2 and the D1 form a power conversion circuit;
when the input voltage is high voltage, Q1 is normally open, and S1 is closed;
wherein,
c1 and C2 are electrolytic or other material type energy storage media;
l1 is a medium of inductance or other inductive material;
q1 is a metal oxide semiconductor field effect transistor or other power switching device;
s1 is any switching device;
d1 is a metal oxide semiconductor field effect transistor or other power switching device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710792534.6A CN107565824A (en) | 2017-09-05 | 2017-09-05 | A kind of electrical energy conversion circuit suitable for wide input voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710792534.6A CN107565824A (en) | 2017-09-05 | 2017-09-05 | A kind of electrical energy conversion circuit suitable for wide input voltage |
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| CN107565824A true CN107565824A (en) | 2018-01-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022241625A1 (en) * | 2021-05-17 | 2022-11-24 | 华为技术有限公司 | Power supply circuit and terminal device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538906B1 (en) * | 2002-02-11 | 2003-03-25 | Delta Electronics, Inc. | Energy storage circuit for DC-DC converter |
| US20040156217A1 (en) * | 2003-02-10 | 2004-08-12 | Phadke Vijay Gangadhar | Single conversion power converter with hold-up time |
| US20040164557A1 (en) * | 2003-02-21 | 2004-08-26 | Richard West | Monopolar dc to bipolar to ac converter |
| JP2007267581A (en) * | 2006-03-29 | 2007-10-11 | Tetsukichi Kuroda | Power-factor improved type dc stabilization switching power supply |
| EP1971019A2 (en) * | 2007-03-13 | 2008-09-17 | SMA Solar Technology AG | Switching device for transformerless conversion of an electric direct current into an AC voltage with two DC/DC converters and an DC/AC converter |
| CN106300982A (en) * | 2015-06-05 | 2017-01-04 | 台达电子工业股份有限公司 | Power supply device with function of prolonging maintenance time |
-
2017
- 2017-09-05 CN CN201710792534.6A patent/CN107565824A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6538906B1 (en) * | 2002-02-11 | 2003-03-25 | Delta Electronics, Inc. | Energy storage circuit for DC-DC converter |
| US20040156217A1 (en) * | 2003-02-10 | 2004-08-12 | Phadke Vijay Gangadhar | Single conversion power converter with hold-up time |
| US20040164557A1 (en) * | 2003-02-21 | 2004-08-26 | Richard West | Monopolar dc to bipolar to ac converter |
| JP2007267581A (en) * | 2006-03-29 | 2007-10-11 | Tetsukichi Kuroda | Power-factor improved type dc stabilization switching power supply |
| EP1971019A2 (en) * | 2007-03-13 | 2008-09-17 | SMA Solar Technology AG | Switching device for transformerless conversion of an electric direct current into an AC voltage with two DC/DC converters and an DC/AC converter |
| CN106300982A (en) * | 2015-06-05 | 2017-01-04 | 台达电子工业股份有限公司 | Power supply device with function of prolonging maintenance time |
Non-Patent Citations (1)
| Title |
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| 陈丹江等: "一种超宽输入范围的开关电源的设计" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022241625A1 (en) * | 2021-05-17 | 2022-11-24 | 华为技术有限公司 | Power supply circuit and terminal device |
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Application publication date: 20180109 |