CN203251084U - Bi-directional current limiter based on bi-directional BUCK converter - Google Patents
Bi-directional current limiter based on bi-directional BUCK converter Download PDFInfo
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- CN203251084U CN203251084U CN 201320296435 CN201320296435U CN203251084U CN 203251084 U CN203251084 U CN 203251084U CN 201320296435 CN201320296435 CN 201320296435 CN 201320296435 U CN201320296435 U CN 201320296435U CN 203251084 U CN203251084 U CN 203251084U
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Abstract
The utility model provides a bi-directional current limiter based on a bi-directional BUCK converter. The bi-directional current limiter comprises the bi-directional BUCK converter, a current detection circuit and a control circuit. The bi-directional BUCK converter comprises a forward-directional BUCK converter and a backward-directional BUCK converter; the forward-directional BUCK converter is in opposite series connection with the backward-directional BUCK converter; the forward-directional BUCK converter and the backward-directional BUCK converter share the same inductor L; an input port of the current detection circuit is connected with a current input port of the bi-directional BUCK converter; an output port of the current detection circuit is connected with an input port of the control circuit; and a control output port of the control circuit is connected with the bi-directional BUCK converter. The bi-directional current limiter based on the bi-directional BUCK converter is advantaged by simple structure and low cost.
Description
Technical field
The utility model belongs to the design of electronic circuits technical field, is specifically related to a kind of bidirectional current limiter based on two-way BUCK converter.
Background technology
Along with the extensive use of power electronic equipment, in the delivery of electrical energy process, have the application scenario of a large amount of energy in bidirectional flows, such as: solar photovoltaic generation system, electric vehicle energy management system, communication with standby power system etc.In the prior art, need independent two flow restricters of installing, thereby realize the function of bidirectional current limiting, so, the high deficiency of complex structure and cost had.
Extensive use along with power electronic equipment; the application scenario that in the delivery of electrical energy process, has the two-way flow of large energy possibility; the utility model discloses a kind of bidirectional current limiter based on two-way BUCK; utilize technology and the control mode of power electronics can effectively limit bidirectional current, effectively protection system.This flow restricter can be applicable to but is not limited only to the power-supply system of charged pool and load, can effectively limit charging current and the discharging current of battery, makes system can keep transmitting energy with cut-off current.
The utility model content
For the defective that prior art exists, the utility model provides a kind of bidirectional current limiter based on two-way BUCK converter, has advantages of simple in structure low with cost.
The technical solution adopted in the utility model is as follows:
The utility model provides a kind of two-way BUCK converter, current detection circuit and control circuit of comprising; Described two-way BUCK converter comprises forward BUCK converter and negative sense BUCK converter; Described forward BUCK converter and described negative sense BUCK converter differential concatenation; Described forward BUCK converter and described negative sense BUCK converter share identical inductances L; The input of described current detection circuit is connected with the current input terminal of described two-way BUCK converter, and the output of described current detection circuit is connected with the input of described control circuit; The control output end mouth of described control circuit is connected with described two-way BUCK converter.
Preferably, described current detection circuit comprises the first current detection circuit and/or the second current detection circuit; Described control circuit comprises the first control output end mouth and the second control output end mouth; Described two-way BUCK converter comprises the first power end and second source end; Anodal being connected with the proper utmost point of described second source of described the first power end forms anodal circuit, and described the first power end negative pole is connected with described second source end negative pole and forms the negative pole circuit; Described inductance L is connected on described anodal circuit; Or described inductance L is connected on described negative pole circuit; Or described inductance L is split as the first inductance L 1 and the second inductance L 2, and described the first inductance L 1 is connected on described anodal circuit, and described the second inductance L 2 is connected on described negative pole circuit.
Preferably, described forward BUCK converter is comprised of the first capacitor C 1, the first power tube Q1, the first sustained diode 1 and described inductance L; Described the first capacitor C 1 is connected in parallel on the two ends of described the first power end; Be connected in parallel on the two ends of described the first capacitor C 1 after described the first power tube Q1 and 1 series connection of described the first sustained diode; Wherein, the negative electrode of described the first sustained diode 1 and described anodal connection, tie point is P1; The anode of described the first sustained diode 1 and described negative pole connection, tie point is P2;
Described negative sense BUCK converter is comprised of the second capacitor C 2, the second power tube Q2, the second sustained diode 2 and described inductance L; Described the second capacitor C 2 is connected in parallel on the two ends of described second source end; Be connected in parallel on the two ends of described the second capacitor C 2 after described the second power tube Q2 and 2 series connection of described the second sustained diode; Wherein, the negative electrode of described the second sustained diode 2 and described anodal connection, tie point is P3; The anode of described the second sustained diode 2 and described negative pole connection, tie point is P4;
Described inductance L is connected on the circuit P1P3; Perhaps, described inductance L is connected on the circuit P2P4; Perhaps described the first inductance L 1 is connected on the circuit P1P3, and described the second inductance L 2 is connected on the circuit P2P4.
Preferably, described the first power tube Q1 and described the first sustained diode 1 series system are: the negative electrode series connection of the anode of described the first power tube Q1 and described the first sustained diode 1.
Preferably, described the first power tube Q1 and described the first sustained diode 1 series system are: the anode series connection of the negative electrode of described the first power tube Q1 and described the first sustained diode 1.
Preferably, described the second power tube Q2 and described the second sustained diode 2 series systems are: the negative electrode series connection of the anode of described the second power tube Q2 and described the second sustained diode 2.
Preferably, described the second power tube Q2 and described the second sustained diode 2 series systems are: the anode series connection of the negative electrode of described the second power tube Q2 and described the second sustained diode 2.
Preferably, described the first control output end mouth is connected with the first power tube Q1 gate pole of described forward BUCK converter, and described the second control output end mouth is connected with the second power tube Q2 gate pole of described negative sense BUCK converter.
The utility model also provides a kind of bidirectional current limiting method of using above-mentioned bidirectional current limiter based on two-way BUCK converter, may further comprise the steps:
When electric current flows to described second source end from described the first power end, described the first current detection circuit detects described the first power end in real time to the current value of supply line between the described forward BUCK converter, and the current value that detects is sent to described control circuit; Whether described control circuit judges described current value less than the setting current-limiting points, if less than, then control described the first power tube Q1 normal open, make described electric current flow to described second source end from described the first power end; If be not less than, then take electric current as control object, described control circuit is controlled described the first power tube Q1 switch-on and-off, obtains then making described cut-off current flow to described second source end from described the first power end less than the cut-off current of setting current-limiting points;
When electric current flows to described the first power end from described second source end, described the second current detection circuit detects described second source end in real time to the current value of supply line between the described negative sense BUCK converter, and the current value that detects is sent to described control circuit; Whether described control circuit judges described current value less than the setting current-limiting points, if less than, then control described the second power tube Q2 normal open, make described electric current flow to described the first power end from described second source end; If be not less than, then take electric current as control object, described control circuit is controlled described the second power tube Q2 switch-on and-off, obtains then making described cut-off current flow to described the first power end from described second source end less than the cut-off current of setting current-limiting points.
Preferably, described the first power tube Q1 switch-on and-off controlled by described control circuit or described control circuit is controlled described the second power tube Q2 switch-on and-off, and concrete control method is: PWM control mode or PFM control mode.
The beneficial effects of the utility model are as follows:
The utility model provides a kind of bidirectional current limiter based on two-way BUCK converter and bidirectional current limiting method, by current detector and control circuit in conjunction with control bidirectional current value, make the bidirectional current value be no more than the situation current downflow of setting current-limiting points, have advantages of simple in structure low with cost.
Description of drawings
The first circuit theory diagrams of the Bi-directional Buck converter that Fig. 1 provides for the utility model;
The second circuit theory diagrams of the Bi-directional Buck converter that Fig. 2 provides for the utility model;
The third circuit theory diagrams of the Bi-directional Buck converter that Fig. 3 provides for the utility model;
The 4th kind of circuit theory diagrams of the Bi-directional Buck converter that Fig. 4 provides for the utility model;
The 5th kind of circuit theory diagrams of the Bi-directional Buck converter that Fig. 5 provides for the utility model;
The 6th kind of circuit theory diagrams of the Bi-directional Buck converter that Fig. 6 provides for the utility model;
The 7th kind of circuit theory diagrams of the Bi-directional Buck converter that Fig. 7 provides for the utility model;
The 8th kind of circuit theory diagrams of the Bi-directional Buck converter that Fig. 8 provides for the utility model;
The 9th kind of circuit theory diagrams of the Bi-directional Buck converter that Fig. 9 provides for the utility model;
A kind of physical circuit figure of the bidirectional current limiter that Figure 10 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated:
(1) Bi-directional Buck converter
Because the bidirectional current limiter that the utility model provides is based on Bi-directional Buck converter, so, the circuit theory of paper Bi-directional Buck converter:
The utility model provides a kind of two-way BUCK converter, comprises forward BUCK converter and negative sense BUCK converter; Forward BUCK converter and negative sense BUCK converter differential concatenation; And forward BUCK converter and negative sense BUCK converter share identical inductances L.
Concrete, two-way BUCK converter comprises the first power end and second source end; Anodal being connected with the proper utmost point of second source of the first power end forms anodal circuit, and the first power end negative pole is connected with second source end negative pole and forms the negative pole circuit; Inductance L can have following three kinds of connected modes: (1) inductance L is connected on anodal circuit; (2) inductance L is connected on the negative pole circuit; (3) inductance L is split as the first inductance L 1 and the second inductance L 2, the first inductance L 1 are connected on anodal circuit, and the second inductance L 2 is connected on the negative pole circuit.As shown in Figure 2, be at positive polar road and the negative pole circuit circuit diagram of series inductance respectively.
Below forward BUCK converter and negative sense BUCK converter are introduced respectively in detail:
(1) forward BUCK converter
Forward BUCK converter is comprised of the first capacitor C 1, the first power tube Q1, the first sustained diode 1 and inductance L; The first capacitor C 1 is connected in parallel on the two ends of the first power end; Be connected in parallel on the two ends of the first capacitor C 1 after the first power tube Q1 and 1 series connection of the first sustained diode; Wherein, the negative electrode of the first sustained diode 1 and anodal connection, tie point are P1; The anode of the first sustained diode 1 and negative pole connection, tie point are P2; Wherein, the first power tube Q1 and the first sustained diode 1 series system comprise following two kinds: (1) series connection A mode---the anode of the first power tube Q1 and the series connection of the negative electrode of the first sustained diode 1.(2) series connection B mode---the negative electrode of the first power tube Q1 and the series connection of the anode of the first sustained diode 1.
(2) negative sense BUCK converter
Negative sense BUCK converter is comprised of the second capacitor C 2, the second power tube Q2, the second sustained diode 2 and inductance L; The second capacitor C 2 is connected in parallel on the two ends of second source end; Be connected in parallel on the two ends of the second capacitor C 2 after the second power tube Q2 and 2 series connection of the second sustained diode; Wherein, the negative electrode of the second sustained diode 2 and anodal connection, tie point are P3; The anode of the second sustained diode 2 and negative pole connection, tie point are P4; Wherein, the second power tube Q2 and the second sustained diode 2 series systems comprise following two kinds: (1) series connection C mode---the anode of the second power tube Q2 and the series connection of the negative electrode of the second sustained diode 2.(2) series connection D mode---the negative electrode of the second power tube Q2 and the series connection of the anode of the second sustained diode 2.
Three kinds of types of attachment of inductance L are: (1) connection A form---inductance L can be connected on the circuit P1P3; (2) connection B form---inductance L is connected on the circuit P2P4; (3) connection C form--inductance L is split as the first inductance L 1 and the second inductance L 2, and wherein, the first inductance L 1 is connected on the circuit P1P3, and the second inductance L 2 is connected on the circuit P2P4.
In the utility model, two kinds of series systems of the first power tube Q1 and the first sustained diode 1: series connection A mode, series connection B mode; Two kinds of series system series connection C modes of the second power tube Q2 and the second sustained diode 2, series connection D mode; And, three kinds of types of attachment of inductance L: connect the A form, connect the B form and be connected the C form; The following formula variety of way can combination in any, and for example: Fig. 1 is: series connection A mode+connection A form+series connection C mode; Fig. 2 is: series connection A mode+connection C form+series connection C mode; Fig. 3 is: series connection B mode+connection B form+series connection D mode; Fig. 4 is: series connection B mode+connection A form+series connection D mode; Fig. 5 is: series connection A mode+connection B form+series connection C mode; Fig. 6 is: series connection A mode+connection A form+series connection D mode; Fig. 7 is: series connection A mode+connection B form+series connection D mode; Fig. 8 is: series connection B mode+connection B form+series connection C mode; Fig. 9 is: series connection B mode+connection A form+series connection C mode.
The Bi-directional Buck converter that the utility model provides; can be used for controlling simultaneously positive terminal voltage, negative terminal voltage; forward current and negative current; effectively system is carried out the voltage and current protection, and, forward BUCK converter and negative sense BUCK converter are merged; and; forward BUCK converter and negative sense BUCK converter share same inductance, therefore, have advantages of simple in structure low with cost.
(2) bidirectional current limiter
Based on above-mentioned Bi-directional Buck converter, the utility model provides a kind of bidirectional current limiter, comprises two-way BUCK converter, current detection circuit and control circuit; Described two-way BUCK converter comprises forward BUCK converter and negative sense BUCK converter; Described forward BUCK converter and described negative sense BUCK converter differential concatenation; Described forward BUCK converter and described negative sense BUCK converter share identical inductances L; The input of described current detection circuit is connected with the current input terminal of described two-way BUCK converter, and the output of described current detection circuit is connected with the input of described control circuit; The control output end mouth of described control circuit is connected with described two-way BUCK converter.
Need to prove, in the utility model, current detection circuit can arrange 1 or 2 or other quantity, in the bidirectional current limiter shown in Figure 10, so that being set, 2 current detection circuits are introduced as example, thus the electric current that flows to from left to right of restriction respectively, and, the electric current that flows to from right to left.But one of ordinary skill in the art will appreciate that, also 1 current detection circuit can only be set, for example, current detection circuit 1 only is set, the electric current that restriction flows to from left to right; Perhaps, current detection circuit 2 only is set, the electric current that restriction flows to from right to left.The utility model does not limit the quantity of the current detection circuit of setting, can arrange flexibly according to actual needs.
Concrete, current detection circuit comprises the first current detection circuit and/or the second current detection circuit; Described control circuit comprises the first control output end mouth and the second control output end mouth; Described the first control output end mouth is connected with the first power tube Q1 gate pole of described forward BUCK converter, and described the second control output end mouth is connected with the second power tube Q2 gate pole of described negative sense BUCK converter.In the utility model, controller can be single-chip microcomputer, dsp controller or cpu controller etc.
Use above-mentioned bidirectional current limiter, the utility model also provides a kind of bidirectional current limiting method, may further comprise the steps:
When electric current flows to described second source end from described the first power end, described the first current detection circuit detects described the first power end in real time to the current value of supply line between the described forward BUCK converter, and the current value that detects is sent to described control circuit; Whether described control circuit judges described current value less than the setting current-limiting points, if less than, then control described the first power tube Q1 normal open, make described electric current flow to described second source end from described the first power end; If be not less than, then take electric current as control object, described control circuit is controlled described the first power tube Q1 switch-on and-off, obtains then making described cut-off current flow to described second source end from described the first power end less than the cut-off current of setting current-limiting points;
When electric current flows to described the first power end from described second source end, described the second current detection circuit detects described second source end in real time to the current value of supply line between the described negative sense BUCK converter, and the current value that detects is sent to described control circuit; Whether described control circuit judges described current value less than the setting current-limiting points, if less than, then control described the second power tube Q2 normal open, make described electric current flow to described the first power end from described second source end; If be not less than, then take electric current as control object, described control circuit is controlled described the second power tube Q2 switch-on and-off, obtains then making described cut-off current flow to described the first power end from described second source end less than the cut-off current of setting current-limiting points.Wherein, described the first power tube Q1 switch-on and-off controlled by control circuit or described control circuit is controlled described the second power tube Q2 switch-on and-off, and concrete control method is: PWM control mode or PFM control mode.
The utility model provides a kind of bidirectional current limiter based on two-way BUCK converter and bidirectional current limiting method, by current detector and control circuit in conjunction with control bidirectional current value, make the bidirectional current value be no more than the situation current downflow of setting current-limiting points, have advantages of simple in structure low with cost.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be looked protection range of the present utility model.
Claims (8)
1. the bidirectional current limiter based on two-way BUCK converter is characterized in that, comprises two-way BUCK converter, current detection circuit and control circuit; Described two-way BUCK converter comprises forward BUCK converter and negative sense BUCK converter; Described forward BUCK converter and described negative sense BUCK converter differential concatenation; Described forward BUCK converter and described negative sense BUCK converter share identical inductances L; The input of described current detection circuit is connected with the current input terminal of described two-way BUCK converter, and the output of described current detection circuit is connected with the input of described control circuit; The control output end mouth of described control circuit is connected with described two-way BUCK converter.
2. the bidirectional current limiter based on two-way BUCK converter according to claim 1 is characterized in that, described current detection circuit comprises the first current detection circuit and/or the second current detection circuit; Described control circuit comprises the first control output end mouth and the second control output end mouth; Described two-way BUCK converter comprises the first power end and second source end; Anodal being connected with the proper utmost point of described second source of described the first power end forms anodal circuit, and described the first power end negative pole is connected with described second source end negative pole and forms the negative pole circuit; Described inductance L is connected on described anodal circuit; Or described inductance L is connected on described negative pole circuit; Or described inductance L is split as the first inductance L 1 and the second inductance L 2, and described the first inductance L 1 is connected on described anodal circuit, and described the second inductance L 2 is connected on described negative pole circuit.
3. the bidirectional current limiter based on two-way BUCK converter according to claim 2 is characterized in that, described forward BUCK converter is comprised of the first capacitor C 1, the first power tube Q1, the first sustained diode 1 and described inductance L; Described the first capacitor C 1 is connected in parallel on the two ends of described the first power end; Be connected in parallel on the two ends of described the first capacitor C 1 after described the first power tube Q1 and 1 series connection of described the first sustained diode; Wherein, the negative electrode of described the first sustained diode 1 and described anodal connection, tie point is P1; The anode of described the first sustained diode 1 and described negative pole connection, tie point is P2;
Described negative sense BUCK converter is comprised of the second capacitor C 2, the second power tube Q2, the second sustained diode 2 and described inductance L; Described the second capacitor C 2 is connected in parallel on the two ends of described second source end; Be connected in parallel on the two ends of described the second capacitor C 2 after described the second power tube Q2 and 2 series connection of described the second sustained diode; Wherein, the negative electrode of described the second sustained diode 2 and described anodal connection, tie point is P3; The anode of described the second sustained diode 2 and described negative pole connection, tie point is P4;
Described inductance L is connected on the circuit P1P3; Perhaps, described inductance L is connected on the circuit P2P4; Perhaps described the first inductance L 1 is connected on the circuit P1P3, and described the second inductance L 2 is connected on the circuit P2P4.
4. the bidirectional current limiter based on two-way BUCK converter according to claim 3, it is characterized in that, described the first power tube Q1 and described the first sustained diode 1 series system are: the negative electrode series connection of the anode of described the first power tube Q1 and described the first sustained diode 1.
5. the bidirectional current limiter based on two-way BUCK converter according to claim 3, it is characterized in that, described the first power tube Q1 and described the first sustained diode 1 series system are: the anode series connection of the negative electrode of described the first power tube Q1 and described the first sustained diode 1.
6. the bidirectional current limiter based on two-way BUCK converter according to claim 3, it is characterized in that, described the second power tube Q2 and described the second sustained diode 2 series systems are: the negative electrode series connection of the anode of described the second power tube Q2 and described the second sustained diode 2.
7. the bidirectional current limiter based on two-way BUCK converter according to claim 3, it is characterized in that, described the second power tube Q2 and described the second sustained diode 2 series systems are: the anode series connection of the negative electrode of described the second power tube Q2 and described the second sustained diode 2.
8. each described bidirectional current limiter based on two-way BUCK converter according to claim 3-7, it is characterized in that, described the first control output end mouth is connected with the first power tube Q1 gate pole of described forward BUCK converter, and described the second control output end mouth is connected with the second power tube Q2 gate pole of described negative sense BUCK converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320296435 CN203251084U (en) | 2013-05-28 | 2013-05-28 | Bi-directional current limiter based on bi-directional BUCK converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320296435 CN203251084U (en) | 2013-05-28 | 2013-05-28 | Bi-directional current limiter based on bi-directional BUCK converter |
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| CN203251084U true CN203251084U (en) | 2013-10-23 |
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| CN 201320296435 Expired - Lifetime CN203251084U (en) | 2013-05-28 | 2013-05-28 | Bi-directional current limiter based on bi-directional BUCK converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337841A (en) * | 2013-05-28 | 2013-10-02 | 北京联动天翼科技有限公司 | Bidirectional current limiter based on bidirectional BUCK converter and bidirectional current limiting method thereof |
| CN105917540A (en) * | 2014-02-18 | 2016-08-31 | 矢崎总业株式会社 | Inrush current suppression circuit |
-
2013
- 2013-05-28 CN CN 201320296435 patent/CN203251084U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337841A (en) * | 2013-05-28 | 2013-10-02 | 北京联动天翼科技有限公司 | Bidirectional current limiter based on bidirectional BUCK converter and bidirectional current limiting method thereof |
| CN103337841B (en) * | 2013-05-28 | 2016-05-11 | 北京联动天翼科技有限公司 | Bidirectional current limiter based on two-way BUCK converter and bidirectional current limiting method |
| CN105917540A (en) * | 2014-02-18 | 2016-08-31 | 矢崎总业株式会社 | Inrush current suppression circuit |
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Address after: 100095 floor No. 1, courtyard No. 33, purple Bird Road, Haidian District, Beijing City, -1 to 5 floor 101 Patentee after: BEIJING LINKDATA TECHNOLOGIES CO.,LTD. Address before: 100044 Beijing city Haidian District Road No. 5 Building 2 401 P.Tricuspidata Patentee before: BEIJING LIANDONG TIANYI TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20131023 |
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