CN219535902U - AC/DC dual-input isolation power supply and power supply system - Google Patents
AC/DC dual-input isolation power supply and power supply system Download PDFInfo
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- CN219535902U CN219535902U CN202320498247.5U CN202320498247U CN219535902U CN 219535902 U CN219535902 U CN 219535902U CN 202320498247 U CN202320498247 U CN 202320498247U CN 219535902 U CN219535902 U CN 219535902U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses an alternating current-direct current dual-input isolation power supply and a power supply system, and relates to the technical field of power conversion; the utility model breaks through the conventional design thought, and in a novel circuit form, in an isolated power supply, the AC power supply is connected with a bridge PFC circuit and a half-bridge LLC circuit, the DC power supply is connected with a half-bridge LLC circuit, so as to achieve the required output voltage, and the utility model has the function of electric isolation, and outputs the first diode and the second diode which are respectively connected in series to supply power to a load; the bridge PFC circuit ensures that the power supply circuit of the power supply is not cut off, improves the working efficiency of the alternating current-direct current dual-input isolation power supply, and reduces the heating value.
Description
Technical Field
The utility model relates to the technical field of power conversion, in particular to an alternating current-direct current dual-input isolation power supply and a power supply system.
Background
The uninterrupted direct current power supply system under the AC/DC dual input is realized, and is widely applied to uninterrupted direct current power supply of control equipment in the field of power conversion; at present, the input form of the PLC power supply in the market is as follows: an ac input or a dc input, the output being a fixed voltage to power the load. The single input voltage form cannot meet the increasingly updated technical requirements, and the input form of the PLC power supply is utilized: an ac input, a dc input, and a diode in series with the output. The method has mature technology, but has low efficiency, large heating value and serious energy consumption waste in the using process; and the time consumed in the mounting or dismounting process is long and maintenance is inconvenient.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the traditional isolation power supply has low efficiency, large heating value and serious energy consumption in the use process; and the time consumed in the mounting or dismounting process is long and maintenance is inconvenient. The utility model aims to provide an alternating current-direct current dual-input isolation power supply and a power supply system, wherein in the isolation power supply, the alternating current power supply is connected with a topology of a bridged PFC circuit and a half-bridge LLC circuit, and the direct current power supply is connected with the half-bridge LLC circuit, so that the required output voltage is achieved, and the technical problems are effectively solved.
The utility model is realized by the following technical scheme:
the scheme provides an alternating current-direct current dual input isolation power supply, includes: the power supply comprises a load, a first diode, a second diode, an alternating current power supply and a direct current power supply; the alternating current power supply and the direct current power supply are respectively connected in series with a first diode and a second diode and then connected into a load to supply power to the load; the Power Factor Correction (PFC) circuit comprises a bridge PFC circuit and a half-bridge LLC circuit;
the alternating current power supply is firstly sequentially input with the bridge PFC circuit and the half-bridge LLC circuit and then connected with the first diode in series, and the direct current power supply is firstly input with the half-bridge LLC circuit and then connected with the second diode in series.
The working principle of the scheme is as follows: the traditional isolation power supply has low efficiency, large heating value and serious energy consumption in the use process; and the time consumed in the mounting or dismounting process is long and maintenance is inconvenient. The utility model aims to provide an alternating current-direct current dual-input isolation power supply and a power supply system, wherein in the isolation power supply, the alternating current power supply is connected with a topology of a bridged PFC circuit and a half-bridge LLC circuit, and the direct current power supply is connected with the half-bridge LLC circuit, so that the required output voltage is achieved, and the technical problems are effectively solved. The scheme breaks through the conventional design thought, and in a novel circuit form, in an isolated power supply, the AC power supply is connected with a topology of a bridged PFC circuit and a half-bridge LLC circuit, the DC power supply is connected with a topology of the half-bridge LLC circuit so as to achieve the required output voltage, the effect of electric isolation is achieved, and the output is respectively connected with a first diode and a second diode in series to supply power to a load. The bridge PFC circuit ensures that the power supply circuit of the power supply is not cut off, improves the working efficiency of the alternating current-direct current dual-input isolation power supply, and reduces the heating value.
The further optimization scheme is that the bridged PFC circuit comprises:
the third diode, the fourth diode, the fifth diode, the sixth diode, the inductor L, the first MOS transistor, the seventh diode and the first capacitor;
the third diode and the fourth diode are connected in series end to form a branch L1, the fifth diode and the sixth diode are connected in series end to form a branch L2, and the branch L1 and the branch L2 are connected in parallel to form a branch L3; one end of the branch circuit L3 is connected with the inductor L in series and then connected to the drain electrode of the first MOS tube, and the other end of the branch circuit L3 is connected to the source electrode of the first MOS tube; the anode of the sixth diode is connected with the drain electrode of the first MOS tube, and the cathode of the sixth diode is connected with the source electrode of the first MOS tube after being connected with the first capacitor in series.
In a further optimized scheme, a first output end of the alternating current power supply is connected between the third diode and the fourth diode, and a second output end of the alternating current power supply is connected between the fifth diode and the sixth diode.
The full-bridge rectifying circuit is formed by a third diode, a fourth diode, a fifth diode and a sixth diode by inputting an alternating current power supply, wherein an inductor L is an energy storage inductor, and a first MOS tube is a main power MOS switch tube. The seventh diode is an output diode, and the first capacitor is an energy storage capacitor.
When the first MOS tube is turned on, the current of the alternating current power supply only passes through the inductor L, and the current of the inductor L rises.
When the first MOS transistor is turned off, the current stored in the inductor L supplies power to the first capacitor and the load through the diode. The inductor L and the first MOS tube can ensure that current is always present in an inductor branch circuit, and the condition that current is cut off in a full-bridge rectifying circuit cannot occur, so that the working efficiency of an alternating current/direct current dual-input isolation power supply is improved, and the heating value is reduced.
The further optimization scheme is that the half-bridge LLC circuit comprises: the second capacitor, the second MOS transistor, the third capacitor, the inductor Lr, the transformer T, the seventh diode, the eighth diode and the fourth capacitor;
one end of the second capacitor is connected with the drain electrode of the second MOS tube, and the other end of the second capacitor is connected with the source electrode of the third MOS tube; the source electrode of the second MOS tube is connected with the drain electrode of the third MOS tube; one end of the third capacitor is connected with the drain electrode of the third MOS tube, the other end of the third capacitor is connected with the first input end of the transformer T in series with the inductor Lr, and the source electrode of the third MOS tube is connected with the first end of the primary winding of the transformer T;
preferably, the transformer further comprises an inductor Lm, one end of the inductor Lm is connected with the second end of the primary winding of the transformer T, and the other end of the inductor Lm is connected with the first end of the primary winding of the transformer T;
the first end of the first secondary winding of the transformer T is connected with the positive electrode of the seventh diode, the second end of the first secondary winding of the transformer T is connected with the first end of the second secondary winding of the transformer T, the second end of the second secondary winding of the transformer T is connected with the positive electrode of the eighth diode, and the negative electrode of the seventh diode and the negative electrode of the eighth diode; one end of the fourth capacitor is connected with the cathode of the seventh diode, and the other end of the fourth capacitor is connected with the second end of the first secondary winding of the transformer T.
The further optimization scheme is that the first end of the primary winding of the transformer T, the first end of the first secondary winding of the transformer T and the first end of the second secondary winding of the transformer T are the same-name ends.
In a further optimization scheme, the fourth capacitor is an electrolytic capacitor.
The further optimization scheme is that a first output end and a second output end of the direct current power supply are respectively connected to two ends of the second capacitor.
The further optimization scheme is that the positive electrode of the first diode or the second diode is connected with the negative electrode of the eighth diode, the negative electrode of the first diode or the second diode is connected with one end of a load, and the other end of the load is connected with the negative electrode of the seventh diode.
The two ends of the second capacitor can be used as the input end of a direct current power supply and can be used as the input end of direct current voltage output by PFC; or may be a dc voltage of the battery. The second capacitor Cr is a resonant capacitor, the inductor Lr is a resonant inductor, T is a main transformer, the seventh diode and the eighth diode are rectifier diodes, and the direct current characteristics of the output filter capacitor LLC resonant conversion at the two ends of the second capacitor are divided into a zero voltage working area and a zero current working area. This transformation has two resonant frequencies: one is the resonance point of Lr and Cr, and the other is determined by Lm, cr and the load conditions. The load is increased and the resonant frequency will rise.
The further optimization scheme is that the alternating current power supply and the direct current power supply are 110V at the same time or 220V at the same time.
The scheme also comprises a power supply system which comprises the alternating current-direct current dual-input isolation power supply.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
the utility model provides an alternating current-direct current dual-input isolation power supply and a power supply system, which break through the conventional design thought, and in the isolation power supply, the alternating current power supply is connected with a bridge PFC circuit and a half bridge LLC circuit, the direct current power supply is connected with the half bridge LLC circuit, so as to achieve the required output voltage, and the power supply system has the function of electric isolation, and outputs a first diode and a second diode which are respectively connected in series to supply power to a load; the bridge PFC circuit ensures that the power supply circuit of the power supply is not cut off, improves the working efficiency of the alternating current-direct current dual-input isolation power supply, and reduces the heating value.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
FIG. 1 is a schematic diagram of an AC/DC dual input isolated power supply;
FIG. 2 is a schematic diagram of a bridged PFC circuit;
fig. 3 is a schematic diagram of a half-bridge LLC circuit configuration.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
Example 1
Embodiment 1 provides an ac/dc dual-input isolated power supply, as shown in fig. 1, comprising: the power supply comprises a load, a first diode D1, a second diode, an alternating current power supply and a direct current power supply; the alternating current power supply and the direct current power supply are respectively connected in series with a first diode D1 and a second diode D2 and then connected into a load to supply power to the load; further comprises: a bridged PFC circuit and a half-bridge LLC circuit;
the alternating current power supply is firstly sequentially input with the bridge PFC circuit and the half-bridge LLC circuit and then connected with the first diode D1 in series, and the direct current power supply is firstly input with the half-bridge LLC circuit and then connected with the second diode D2 in series.
As shown in fig. 2, the bridged PFC circuit includes:
the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the inductor L, the first MOS transistor Q1, the seventh diode D7 and the first capacitor C1;
the third diode D3 and the fourth diode D4 are connected in series end to form a branch L1, the fifth diode D5 and the sixth diode D6 are connected in series end to form a branch L2, and the branch L1 and the branch L2 are connected in parallel to form a branch L3; one end of the branch circuit L3 is connected with the inductor L in series and then connected to the drain electrode of the first MOS tube Q1, and the other end of the branch circuit L3 is connected to the source electrode of the first MOS tube Q1; the positive pole of the sixth diode is connected with the drain electrode of the first MOS tube Q1, and the negative pole of the sixth diode is connected with the source electrode of the first MOS tube Q1 after being connected with the first capacitor C1 in series.
The first output end of the alternating current power supply is connected between the third diode D3 and the fourth diode D4, and the second output end of the alternating current power supply is connected between the fifth diode D5 and the sixth diode D6.
The full-bridge rectifying circuit is formed by a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, an inductor L is an energy storage inductor, and a first MOS tube Q1 is a main power MOS switch tube. The seventh diode D7 is an output diode, and the first capacitor C1 is an energy storage capacitor.
When the first MOS transistor Q1 is turned on, the current of the AC power supply only passes through the inductor L, and the current of the inductor L rises.
When the first MOS transistor Q2 is turned off, the current stored in the inductor L supplies power to the first capacitor and the load through the diode. The inductor L and the first MOS tube can ensure that current is always present in an inductor branch circuit, and the condition that current is cut off in a full-bridge rectifying circuit cannot occur, so that the working efficiency of an alternating current/direct current dual-input isolation power supply is improved, and the heating value is reduced.
As shown in fig. 3, the half-bridge LLC circuit includes: the second capacitor C2, the second MOS transistor Q2, the third MOS transistor Q3, the third capacitor Cr, the inductor Lr, the inductor Lm, the transformer T, the seventh diode D7, the eighth diode D8 and the fourth capacitor;
one end of the second capacitor C2 is connected with the drain electrode of the second MOS tube Q2, and the other end of the second capacitor C is connected with the source electrode of the third MOS tube Q3; the source electrode of the second MOS tube Q2 is connected with the drain electrode of the third MOS tube; one end of the third capacitor Cr is connected with the drain electrode of the third MOS tube Q3, the other end of the third capacitor Cr is connected with the first input end of the transformer T in series with the inductor Lr, and the source electrode of the third MOS tube Q3 is connected with the first end of the primary winding of the transformer T; one end of the inductor Lm is connected with the second end of the primary winding of the transformer T, and the other end is connected with the first end of the primary winding of the transformer T;
the first end of the first secondary winding of the transformer T is connected with the positive electrode of the seventh diode D7, the second end of the first secondary winding of the transformer T is connected with the first end of the second secondary winding of the transformer T, the second end of the second secondary winding of the transformer T is connected with the positive electrode of the eighth diode D8, and the negative electrode of the seventh diode D7 and the negative electrode of the eighth diode D8; one end of the fourth capacitor is connected with the cathode of the seventh diode D7, and the other end of the fourth capacitor is connected with the second end of the first secondary winding of the transformer T.
The first end of the primary winding of the transformer T, the first end of the first secondary winding of the transformer T and the first end of the second secondary winding of the transformer T are the same-name ends.
The fourth capacitor is an electrolytic capacitor.
The first output end and the second output end of the direct current power supply are respectively connected to two ends of the second capacitor.
The positive pole of first diode D1 or second diode D2 connects the negative pole of eighth diode D8, and the negative pole of first diode D1 or second diode D2 connects one end of load, and the negative pole of seventh diode D7 is connected to the other end of load.
The alternating current power supply and the direct current power supply are 110V at the same time or 220V at the same time.
The two ends of the second capacitor C2 can be used as the input end of a direct current power supply and can be used as the input end of a direct current voltage output by PFC; or may be a dc voltage of the battery. The second capacitor Cr is a resonant capacitor, the inductor Lr is a resonant inductor, T is a main transformer, the seventh diode and the eighth diode are rectifier diodes, and the direct current characteristics of the output filter capacitor LLC resonant conversion at the two ends of the second capacitor are divided into a zero voltage working area and a zero current working area. This transformation has two resonant frequencies: one is the resonance point of Lr and Cr, and the other is determined by Lm, cr and the load conditions. The load is increased and the resonant frequency will rise.
Example 2
The embodiment provides a power supply system, which comprises the alternating current-direct current dual-input isolation power supply described in embodiment 1. The alternating current-direct current dual-input isolation power supply and the power supply system break through the conventional design thought, in the isolation power supply, the alternating current power supply is connected into a topology of a bridged PFC circuit and a half-bridge LLC circuit, the direct current power supply is connected into a half-bridge LLC circuit so as to achieve the required output voltage, the effect of electrical isolation is achieved, and the output is respectively connected with a first diode and a second diode in series to supply power to a load; the bridge PFC circuit ensures that the power supply circuit of the power supply is not cut off, improves the working efficiency of the alternating current-direct current dual-input isolation power supply, and reduces the heating value.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. An ac/dc dual input isolated power supply comprising: the power supply comprises a load, a first diode, a second diode, an alternating current power supply and a direct current power supply; the alternating current power supply and the direct current power supply are respectively connected in series with a first diode and a second diode and then connected into a load to supply power to the load; characterized by further comprising: a bridged PFC circuit and a half-bridge LLC circuit;
the alternating current power supply is firstly sequentially input with the bridge PFC circuit and the half-bridge LLC circuit and then connected with the first diode in series, and the direct current power supply is firstly input with the half-bridge LLC circuit and then connected with the second diode in series.
2. The ac/dc dual input isolated power supply of claim 1, wherein said bridged PFC circuit comprises:
the third diode, the fourth diode, the fifth diode, the sixth diode, the inductor L, the first MOS transistor, the seventh sixth diode and the first capacitor;
the third diode and the fourth diode are connected in series end to form a branch L1, the fifth diode and the sixth diode are connected in series end to form a branch L2, and the branch L1 and the branch L2 are connected in parallel to form a branch L3; one end of the branch circuit L3 is connected with the inductor L in series and then connected to the drain electrode of the first MOS tube, and the other end of the branch circuit L3 is connected to the source electrode of the first MOS tube; the anode of the sixth diode is connected with the drain electrode of the first MOS tube, and the cathode of the sixth diode is connected with the source electrode of the first MOS tube after being connected with the first capacitor in series.
3. An ac/dc dual input isolated power supply as claimed in claim 2, wherein the first output of the ac power supply is connected between the third diode and the fourth diode, and the second output of the ac power supply is connected between the fifth diode and the sixth diode.
4. An ac/dc dual input isolated power supply as claimed in claim 1, wherein the half-bridge LLC circuit comprises: the second capacitor, the second MOS transistor, the third capacitor, the inductor Lr, the transformer T, the seventh diode, the eighth diode and the fourth capacitor;
one end of the second capacitor is connected with the drain electrode of the second MOS tube, and the other end of the second capacitor is connected with the source electrode of the third MOS tube; the source electrode of the second MOS tube is connected with the drain electrode of the third MOS tube; one end of the third capacitor is connected with the drain electrode of the third MOS tube, the other end of the third capacitor is connected with the first input end of the transformer T in series with the inductor Lr, and the source electrode of the third MOS tube is connected with the first end of the primary winding of the transformer T;
the first end of the first secondary winding of the transformer T is connected with the positive electrode of the seventh diode, the second end of the first secondary winding of the transformer T is connected with the first end of the second secondary winding of the transformer T, the second end of the second secondary winding of the transformer T is connected with the positive electrode of the eighth diode, and the negative electrode of the seventh diode and the negative electrode of the eighth diode; one end of the fourth capacitor is connected with the cathode of the seventh diode, and the other end of the fourth capacitor is connected with the second end of the first secondary winding of the transformer T.
5. An ac/dc dual input isolated power supply as claimed in claim 4, wherein the first end of the primary winding of the transformer T, the first end of the first secondary winding of the transformer T, and the first end of the second secondary winding of the transformer T are synonymous ends.
6. An ac/dc dual input isolated power supply as claimed in claim 4, wherein said fourth capacitor is an electrolytic capacitor.
7. An ac/dc dual input isolated power supply as claimed in claim 4, wherein the first output terminal and the second output terminal of the dc power supply are connected to two ends of the second capacitor, respectively.
8. An ac/dc dual input isolated power supply as claimed in claim 5, wherein the anode of the first diode or the second diode is connected to the cathode of the eighth diode, the cathode of the first diode or the second diode is connected to one end of the load, and the other end of the load is connected to the cathode of the seventh diode.
9. An ac/dc dual input isolated power supply according to claim 1, wherein the ac power supply and the dc power supply are 110V at the same time or 220V at the same time.
10. A power supply system comprising an ac/dc dual input isolated power supply as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320498247.5U CN219535902U (en) | 2023-03-15 | 2023-03-15 | AC/DC dual-input isolation power supply and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320498247.5U CN219535902U (en) | 2023-03-15 | 2023-03-15 | AC/DC dual-input isolation power supply and power supply system |
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| CN219535902U true CN219535902U (en) | 2023-08-15 |
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| CN202320498247.5U Active CN219535902U (en) | 2023-03-15 | 2023-03-15 | AC/DC dual-input isolation power supply and power supply system |
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| CN (1) | CN219535902U (en) |
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- 2023-03-15 CN CN202320498247.5U patent/CN219535902U/en active Active
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