CN108075673B - Multi-path common-ground rectification circuit and switching power supply - Google Patents
Multi-path common-ground rectification circuit and switching power supply Download PDFInfo
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- CN108075673B CN108075673B CN201710850058.9A CN201710850058A CN108075673B CN 108075673 B CN108075673 B CN 108075673B CN 201710850058 A CN201710850058 A CN 201710850058A CN 108075673 B CN108075673 B CN 108075673B
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- 239000003990 capacitor Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/064—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode with several outputs
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention provides a multi-path common-ground rectification circuit and a switching power supply, wherein the rectification circuit comprises a plurality of paths of full-wave rectification paths which are connected in parallel with the same alternating current power supply; and the switch module is arranged on any one or any one end of any one of the multiple paths of full-wave rectification paths and used for disconnecting the path where the switch module is located when the switch module is opened. Because the plurality of direct current output ends are grounded in common, the switch module is arranged at any one of the input end or the output end of the full-wave rectification passage, when the switch module is disconnected, because the full-wave rectification passage is connected in parallel with the same alternating current power supply, no current passes through the passage where the switch module is positioned when any one of two poles of the alternating current power supply is high potential, and the direct current module which is output by multiple paths in common ground can effectively control one or more paths to be powered off. The full power output of other paths can be ensured, so that the load can work more reliably, and the reliability of the circuit is ensured.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a multi-path common-ground rectification circuit and a switching power supply.
Background
A conventional multi-output rectifier circuit is generally a multi-output non-common-ground rectifier circuit as shown in fig. 1 (two-way rectifier circuit is taken as an example for explanation). In a multi-output rectification circuit, one or more circuits of the multi-output rectification circuit usually need to be powered off, for example, when a load device is in a standby state, the power supply of the device needs to be cut off, and the power supply of a standby controller needs to be continuously powered on.
In the prior art, as shown in fig. 1, a switch module 40 is usually added to an input terminal of one or more paths of rectifier modules that need to be powered off for powering off one or more paths of outputs, and when power is needed to be powered off, the power off of the path can be realized only by turning off a switch.
However, a multi-path rectifier circuit scheme sometimes requires multiple common grounds, for example, when the VCC winding of the dc brushless motor and the auxiliary winding of the switching power supply are the same winding, and the VDC uses another rectifier circuit, the rectifier circuit reference ground of the switching power supply and the rectifier circuit reference ground of the VDC are common. (two paths are taken as an example for explanation), the switch module 40 is added to the input end of one path of the rectifier module, when the switch module 40 is disconnected, the capacitor C1 and the capacitor C2 are charged, and the two paths have outputs and cannot play a role in disconnecting one path of the two paths.
Therefore, how to control one or more power failures in the multi-path common-ground output rectifying circuit becomes an urgent problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is to control one or more paths of power failure in a rectifying circuit with multi-path common ground output.
To this end, according to a first aspect, an embodiment of the present invention provides a multi-path common ground rectification circuit, including: the multi-path full-wave rectification circuit is connected in parallel with the same alternating current power supply; and the switch module is arranged on any one end of any one or any one of the alternating current sides of the multiple paths of full-wave rectification paths and used for disconnecting the path where the switch module is located when the switch module is opened.
Optionally, for being arranged between the ac power source and the dc output of the full-wave rectification path; the switch module is arranged at any end of the alternating current side of the full-bridge rectifier or the full-wave bridge stack and used for disconnecting the path at one end of the alternating current side where the switch module is located when the switch module is opened.
Optionally, the switch module comprises: any one of a relay circuit, a semiconductor switch, or a mechanical switch.
Optionally, the multi-path common ground rectification circuit further comprises: and the filter circuits are respectively connected in parallel to the direct current output ends of the full-wave rectification paths.
Optionally, the filter circuit comprises at least one capacitor.
Optionally, the multi-path common ground rectification circuit further comprises: and the diode is arranged between the direct current output end of the full-wave rectification path and the switch module, the anode of the diode is connected with the switch module, and the cathode of the diode is connected with the direct current output end.
Optionally, the multi-path common ground rectification circuit further comprises: and the resistors are respectively arranged in the multiple paths of full-wave rectification paths.
Optionally, the resistor comprises: thermistors, cement resistors, wire wound resistors and/or metal encapsulated resistors.
According to a second aspect, an embodiment of the present invention provides a switching power supply, including:
a switching power supply main circuit and a multi-path common ground rectifier circuit as described in any one of the above first aspects.
The rectifying circuit and the switching power supply provided by the embodiment of the invention comprise a plurality of paths of full-wave rectifying paths which are connected in parallel with the same alternating current power supply; and the switch module is arranged on any one or any one end of any one of the multiple paths of full-wave rectification paths and used for disconnecting the path where the switch module is located when the switch module is opened. Because the plurality of direct current output ends are grounded in common, the switch module is arranged at any one of the input end or the output end of the full-wave rectification passage, when the switch module is disconnected, because the full-wave rectification passage is connected in parallel with the same alternating current power supply, no current passes through the passage where the switch module is positioned when any one of two poles of the alternating current power supply is high potential, and the direct current module which is output by multiple paths in common ground can effectively control one or more paths to be powered off. The full power output of other paths can be ensured, so that the load can work more reliably, and the reliability of the circuit is ensured.
Drawings
FIG. 1 is a diagram of an off-ground two-way output rectification circuit capable of disconnecting one way in the prior art;
FIG. 2 is a diagram of a common-ground two-way output rectification circuit capable of disconnecting one way in the prior art;
FIG. 3 shows a diagram of a two-way common-ground rectification circuit in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
An embodiment of the present invention provides a rectifier circuit, as shown in fig. 3, the rectifier circuit includes: a multi-path full-wave rectification path 30 connected in parallel to the same alternating current power supply; and the switch module 40 is arranged on the direct current side, namely the output end, of any one or more of the multiple paths of the full-wave rectification paths 30 and used for disconnecting the path where the switch module 40 is located when the switch module 40 is opened. In a specific embodiment, the AC power source 10 may be a domestic power source, may be an industrial power source, and the AC power source 10 may include a first electrode AC-L1 and a second electrode AC-N1, wherein the electrical signal of the first electrode AC-L1 is a live electrical signal and the filtered electrical signal of the second electrode AC-N1 is a neutral electrical signal. In the present embodiment, the plurality of common-ground dc output terminals 20 includes at least two dc output terminals, each of which corresponds to one of the plurality of full-wave rectification paths 30. In this embodiment, the switch module 40 may be disposed at any end of the direct current side of the full-wave rectification path 30, and specifically, the switch module 40 may be disposed at an end of the direct current side of the full-wave rectification path 30 of one path that needs to be disconnected. The switching module 40 may be provided on the dc side of each full-wave rectification path 30. In the present embodiment, in order to save cost, it is provided only at one end of the direct current side on the path that needs to be disconnected, and the switch module 40 is turned off when the output of the path needs to be disconnected. In this embodiment, when the switch module 40 is in the off state, no current is output from the dc output terminal corresponding to the currently-off switch module 40. In the present embodiment, since the plurality of dc output terminals 20 are connected to the ground, the plurality of full-wave rectification paths 30 can ensure that the output terminals are full-wave output.
The operation principle of the multi-path common ground output rectifying circuit is shown in fig. 3, as shown in fig. 3, the potential of the first electrode AC-L1 is higher than that of the second electrode AC-N1, the first path through which the current flows is the first electrode AC-L1, the first diode D1, the first resistor RC1, the first capacitor C1, the fourth diode D4 (or the eighth diode D8) to the second electrode AC-N1, and the first load R1 is electrically operated. The second path is from the first electrode AC-L1, the fifth diode D5, the second resistor RC2, the second capacitor C2, the fourth diode D4 (or the eighth diode D8) to the second electrode AC-N1, and the second load R2 is powered on. The potential of the second electrode AC-N1 is higher than that of the first electrode AC-L1, the third path for the current to flow is that the second electrode AC-N1, a second diode D2, a first resistor RC1, a first capacitor C1, a third diode D3 (or a seventh diode D7) reach the first electrode AC-L1, the first load R1 is electrified to work, and the first load R1 is electrified to work. The fourth path is that the second electrode AC-N1, the sixth diode D6, the second resistor R2, the second capacitor C2, the third diode D3 (or the seventh diode D7) to the first electrode AC-L1, and the second load R2 are powered on. Thereby, two-way full-wave output can be realized.
Taking fig. 3 as an example, the filter circuit is a common ground dc output terminal, and when the switch module 40 is at the output end of the full-wave rectification path, and when the switch module 40 is turned off and the potential of the first electrode AC-L1 is higher than that of the second electrode AC-N1, the current path is from the first electrode AC-L1, the first diode D1, the first resistor RC1, the first capacitor C1, the fourth diode D4 (or the eighth diode D8) to the second electrode AC-N1. The second capacitor C2 has no charging current flowing through it, and the second load R2 has no current flowing through it. The potential of the second electrode AC-N1 is higher than that of the first electrode AC-L1, the current path is, the second electrode AC-N1, the second diode and D2, the first resistor RC1, the first capacitor C1, the third diode D3 and the first electrode AC-L1, not only can the full-wave output of a path without the switch module 40 be ensured, but also one or more paths in a rectifying circuit with multi-path common-ground output can be effectively controlled to be disconnected. Specifically, table 1 can be seen to exemplarily show the output conditions of different paths in different switching states of the switch module on the path of C1:
| path of C1 | Path of C2 | |
| Switch module path | Full power output | Full power output |
| Switch module open circuit | Not working | Full power output |
TABLE 1
In this embodiment, the first resistor RC1 and the second resistor RC2 are used to limit the impact current, the first resistor RC1 and the second resistor RC2 may be thermistors, cement resistors, wire-wound resistors, and metal-clad resistors, and in this embodiment, the first resistor RC1 and the second resistor RC2 may also be other high-power resistors. The ptc (positive Temperature coefficient) resistor or the ntc (negative Temperature coefficient) resistor may be selected according to actual conditions, and in this embodiment, the positions of the first resistor RC1 and the second resistor RC2 are not limited to the positions shown in fig. 3, and may be set at any position between the power supply and the dc output terminal. In the present embodiment, the first capacitor C1 and the second capacitor C2 are filter capacitors for stabilizing the output dc power.
In this embodiment, the switch circuit module 40 may be a relay, a semiconductor switch (e.g., a thyristor), or a mechanical switch. Because the withstand voltage of the relay is usually 250V ac voltage, the current is 10A, and the dc withstand voltage is about 30V, when the relay is arranged on the dc side, the voltage on the dc side may reach about 310V, therefore, a relay with a larger withstand voltage needs to be selected to meet the withstand voltage requirement, which increases the cost.
The multi-path full-wave rectification circuit is connected in parallel with the same alternating current power supply; and the switch module is arranged on any one or any one end of any one of the multiple paths of full-wave rectification paths and used for disconnecting the path where the switch module is located when the switch module is opened. Because the plurality of direct current output ends are grounded in common, the switch module is arranged at any one of the input end or the output end of the full-wave rectification passage, when the switch module is disconnected, because the full-wave rectification passage is connected in parallel with the same alternating current power supply, no current passes through the passage where the switch module is positioned when any one of two poles of the alternating current power supply is high potential, and the direct current module which is output by multiple paths in common ground can effectively control one or more paths to be powered off. The full power output of other paths can be ensured, so that the load can work more reliably, and the reliability of the circuit is ensured.
The embodiment of the invention also provides a switching power supply, which comprises a main circuit of the switching power supply and the multi-path common-ground rectification circuit described in the embodiment.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A multi-path common ground rectifier circuit, comprising:
the multi-path full-wave rectification circuit is connected in parallel with the same alternating current power supply;
the switch module is arranged on any one or any DC side of the multiple paths of full-wave rectification paths and used for disconnecting the path where the switch module is located when the switch module is opened;
the diode is arranged between the direct current output end of the full-wave rectification path and the switch module, the anode of the diode is connected with the switch module, the cathode of the diode is connected with the direct current output end, and the direct current output end is used for being connected with an output load of one path of the full-wave rectification path.
2. The multi-path common ground rectification circuit according to claim 1, wherein the full-wave rectification path comprises:
a full-wave rectifier bridge or a full-wave bridge stack arranged between the AC power supply and the DC output end of the full-wave rectification circuit;
the switch module is arranged on any one path or any multiple paths of direct current sides of the full-wave rectifier bridge or the full-wave bridge stack and used for disconnecting a path where the switch module is located when the switch module is disconnected.
3. The multi-way common ground rectifier circuit of claim 1, wherein said switching module comprises:
any one of a relay circuit, a semiconductor switch, or a mechanical switch.
4. The multi-way common ground rectifier circuit of claim 1, further comprising:
and the filter circuits are respectively connected in parallel to the direct current output ends of the full-wave rectification paths.
5. The multi-way common ground rectifier circuit of claim 4 wherein said filter circuit comprises at least one capacitor.
6. The multi-way common ground rectifier circuit according to any one of claims 1-5, further comprising: and the resistors are respectively arranged in the multiple paths of full-wave rectification paths.
7. The multi-path common ground rectification circuit according to claim 6, wherein the resistor comprises a thermistor, a cement resistor, a wire wound resistor and/or a metal case encapsulated resistor.
8. A switching power supply, comprising:
switching power supply main circuit and
the multi-path common ground rectification circuit according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710850058.9A CN108075673B (en) | 2017-09-19 | 2017-09-19 | Multi-path common-ground rectification circuit and switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710850058.9A CN108075673B (en) | 2017-09-19 | 2017-09-19 | Multi-path common-ground rectification circuit and switching power supply |
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| CN108075673A CN108075673A (en) | 2018-05-25 |
| CN108075673B true CN108075673B (en) | 2020-02-28 |
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| CN207530719U (en) * | 2017-09-19 | 2018-06-22 | 珠海格力电器股份有限公司 | Multi-path common-ground rectification circuit and switching power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014050987A1 (en) * | 2012-09-27 | 2014-04-03 | ダイキン工業株式会社 | Direct ac power conversion device |
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2017
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| CN2114916U (en) * | 1992-01-11 | 1992-09-02 | 江西教育学院 | Dc ups power source |
| CN2131248Y (en) * | 1992-06-17 | 1993-04-28 | 李金良 | Adjustable multi-output ac-dc converter |
| CN1525632A (en) * | 2002-12-18 | 2004-09-01 | 因芬尼昂技术股份公司 | Method for generating direct voltage, circuit device and switch-mode adjusting monitoring module |
| CN101577484A (en) * | 2008-05-08 | 2009-11-11 | 海尔集团公司 | Power supply device of switch power supply of external convertible frequency air conditioner |
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