CN111879994A - Bidirectional current detection circuit and detection method thereof - Google Patents
Bidirectional current detection circuit and detection method thereof Download PDFInfo
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- CN111879994A CN111879994A CN202010855963.5A CN202010855963A CN111879994A CN 111879994 A CN111879994 A CN 111879994A CN 202010855963 A CN202010855963 A CN 202010855963A CN 111879994 A CN111879994 A CN 111879994A
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- 238000001514 detection method Methods 0.000 title claims abstract description 51
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a bidirectional current detection circuit, which comprises a switch to be detected, a detection switch tube, a current transformer, a full-bridge rectifier and a sampling resistor, wherein the switch to be detected is connected with the primary side of the current transformer, two input ends of the full-bridge rectifier are respectively connected with two output ends of the current transformer, one output end of the full-bridge rectifier is connected with a drain electrode of the detection switch tube, the other output end of the full-bridge rectifier is connected with one end of the sampling resistor, and the other end of the sampling resistor is connected with a source electrode of the detection switch tube, and the bidirectional current detection circuit has the beneficial effects that: this application detection circuitry can realize that single current transformer carries out two-way detection to the electric current, detects the switch tube and can make current transformer effective magnetism reset, and this circuit can be to the current that awaits measuring sampling in real time, simple structure, small in size, and is with low costs.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to current detection technologies, and in particular, to a bidirectional current detection circuit and a detection method thereof.
[ background of the invention ]
The current of a switching tube is usually required to be detected in a switching power supply to carry out current control or prevent the current from exceeding a limit value, and the current directions required to be detected are different for accurately detecting the current of the switching tube to be detected due to different working states of circuits, so that the required current detection circuit can detect both positive current and negative current; the current transformers are used for detecting current in a common mode, but most of the current detection modes adopting a single current transformer do not have the capability of detecting currents with positive and negative polarities, and the current can be detected in a bidirectional mode only by adopting 2 current transformers, so that the cost and the complexity of a circuit are increased, and the size is increased.
[ summary of the invention ]
The present invention is directed to solving the above-mentioned problems of the current detection methods, and provides a bidirectional current detection circuit and a detection method thereof.
The invention is realized by the following technical scheme: the utility model provides a two-way current detection circuit, is including waiting to detect switch, detection switch tube, current transformer, full-bridge rectifier, sampling resistor, it links to each other with the current transformer primary side to wait to detect the switch, two inputs of full-bridge rectifier are connected with two outputs of current transformer respectively, an output and the drain electrode that detects the switch tube of full-bridge rectifier are connected, another output and the one end of sampling resistor of full-bridge rectifier are connected, the other end and the source electrode that detects the switch tube of sampling resistor are connected.
Further, the full-bridge rectifier is a full-bridge rectifier formed by four switching devices.
Furthermore, the switch to be detected and the detection switch tube are in high-frequency switch working state structures, and the switch working states of the switch to be detected and the detection switch tube are consistent.
A current sampling circuit samples the current to be detected, the sampled current is transmitted to a current value detection circuit for detection, a full-wave rectifier is adopted to rectify the current transmitted by the current sampling circuit, and the current to be detected is converted according to the voltage at two ends of a sampling resistor or is directly input as the current quantity of other circuits.
The invention has the beneficial effects that: this application detection circuitry can realize that single current transformer carries out two-way detection to the electric current, detects the switch tube and can make current transformer effective magnetism reset, and this circuit can be to the current that awaits measuring sampling in real time, simple structure, small in size, and is with low costs.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a bidirectional current detection circuit according to the present invention;
FIG. 2 is a schematic structural diagram of a full bridge rectifier of the bidirectional current detection circuit in which two switching devices of one bridge arm are replaced with two bidirectional switches and a detection switching tube is omitted;
FIG. 3 is a schematic structural diagram of a full bridge rectifier with two upper bridge arms of two switching devices replaced by two bidirectional switches and a detection switch tube eliminated according to the bidirectional current detection circuit of the present invention;
FIG. 4 is a schematic structural diagram of a full bridge rectifier with two switching devices of two lower bridge arms replaced by two bidirectional switches and a detection switch tube eliminated according to the bidirectional current detection circuit of the present invention;
FIG. 5 is a schematic diagram of a full bridge rectifier with four switching devices replaced by four diodes according to the bidirectional current detection circuit of the present invention;
fig. 6 is a schematic structural diagram of a center-tapped full-wave rectifier formed by replacing a full-bridge rectifier of the bidirectional current detection circuit with two switching devices according to the present invention;
FIG. 7 is a schematic structural diagram of a center-tapped full-wave rectifier formed by replacing a full-bridge rectifier of the bidirectional current detection circuit with two diodes according to the present invention;
reference numerals: 1. a switch to be detected; 2. detecting a switch tube; 3. a current transformer; 4. a full bridge rectifier; 41. a switching device; 42. a bi-directional switch; 43. a diode; 5. sampling a resistor; 6. center tapped full wave rectification.
[ detailed description ] embodiments
The invention is further described with reference to the accompanying drawings and the detailed description:
the first embodiment is as follows:
as shown in fig. 1, a two-way current detection circuit, including waiting to detect switch 1, detection switch tube 2, current transformer 3, full-bridge rectifier 4, sampling resistor 5, it links to each other with current transformer 3 primary to wait to detect switch 1, two inputs of full-bridge rectifier 4 are connected with two outputs of current transformer 3 respectively, an output and the drain electrode that detects switch tube 2 of full-bridge rectifier 4 are connected, another output and the one end of sampling resistor 5 of full-bridge rectifier 4 are connected, the other end and the source electrode that detects switch tube 2 of sampling resistor 5 are connected.
Preferably, the full-bridge rectifier 4 is a full-bridge rectifier composed of four switching devices 41.
Preferably, the switch 1 to be detected and the detection switch tube 2 are high-frequency switch working state structures, and the switch working states of the switch 1 to be detected and the detection switch tube 2 are consistent.
Example two:
as shown in fig. 2, the two switching devices 41 of one arm of the full-bridge rectifier 4 can be replaced by two bidirectional switches 42, and the detection switch tube 2 is eliminated.
Example three:
as shown in fig. 3, the switching devices 41 of the two upper arms of the full-bridge rectifier 4 can be replaced by two bidirectional switches 42, and the detection switch tube 2 is eliminated.
Example four:
as shown in fig. 4, the two switching devices 41 of the two lower arms of the full-bridge rectifier 4 can be replaced by two bidirectional switches 42, and the detection switch tube 2 is eliminated.
Example five:
as shown in fig. 5, the four switching devices 41 of the full-bridge rectifier 4 may be replaced by four diodes 43.
Example six:
as shown in fig. 6, the secondary side of the current transformer may be two windings, and the full-bridge rectifier 4 is replaced by a center-tapped full-wave rectifier 6, and the center-tapped full-wave rectifier 6 is composed of two switching devices 41.
Example seven:
as shown in fig. 7, the secondary side of the current transformer may be two windings, the full-bridge rectifier 4 is replaced by a center-tapped full-wave rectifier 6, and the two switching devices 41 of the center-tapped full-wave rectifier 6 are replaced by two diodes 43.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (4)
1. A bi-directional current sense circuit, characterized by: including waiting to detect switch, detection switch tube, current transformer, full-bridge rectifier, sampling resistor, it links to each other with the current transformer primary side to wait to detect the switch, two inputs of full-bridge rectifier are connected with two outputs of current transformer respectively, an output of full-bridge rectifier is connected with the drain electrode that detects the switch tube, another output of full-bridge rectifier is connected with sampling resistor's one end, sampling resistor's the other end is connected with the source electrode that detects the switch tube.
2. The bi-directional current sense circuit of claim 1, wherein: the full-bridge rectifier is formed by four switching devices.
3. The bi-directional current sense circuit of claim 1, wherein: the switch to be detected and the detection switch tube are high-frequency switch working state structures, and the switch working states of the switch to be detected and the detection switch tube are consistent.
4. A detection method of a bidirectional current detection circuit is characterized in that: the current sampling circuit samples the current to be detected, transmits the sampled current to the current value detection circuit for detection, rectifies the current transmitted by the current sampling circuit by adopting a full-wave rectifier, converts the current to be detected according to the voltage at two ends of the sampling resistor or directly inputs the current as the current quantity of other circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855963.5A CN111879994A (en) | 2020-08-24 | 2020-08-24 | Bidirectional current detection circuit and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855963.5A CN111879994A (en) | 2020-08-24 | 2020-08-24 | Bidirectional current detection circuit and detection method thereof |
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| CN111879994A true CN111879994A (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010855963.5A Pending CN111879994A (en) | 2020-08-24 | 2020-08-24 | Bidirectional current detection circuit and detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640565A (en) * | 2021-07-26 | 2021-11-12 | 台达电子企业管理（上海）有限公司 | Current detection circuit, current detection method and converter |
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|---|---|---|---|---|
| JPH08103080A (en) * | 1994-09-29 | 1996-04-16 | Yutaka Denki Seisakusho:Kk | High input power factor power supply circuit and overvoltage protection circuit for said power supply |
| CN101738531A (en) * | 2009-12-31 | 2010-06-16 | 杭州凯尔达电焊机有限公司 | Method for detecting output current of inverting welding machine |
| CN102636676A (en) * | 2011-02-12 | 2012-08-15 | 中兴通讯股份有限公司 | Bridge-type current detecting circuit |
| CN204832315U (en) * | 2015-08-04 | 2015-12-02 | 广东爱迪贝克软件科技有限公司 | Two -way current detection circuit |
| CN206671401U (en) * | 2017-03-21 | 2017-11-24 | 中国长城科技集团股份有限公司 | A kind of current sampling circuit and without bridge commutation system |
| CN207601159U (en) * | 2017-12-14 | 2018-07-10 | 杰华特微电子（杭州）有限公司 | A kind of current detection circuit and switching circuit |
| CN110365216A (en) * | 2019-07-31 | 2019-10-22 | 上海军陶电源设备有限公司 | Current sampling circuit and full-bridge switching power supply circuit |
| CN111431423A (en) * | 2020-04-26 | 2020-07-17 | 深圳麦格米特电气股份有限公司 | Current sampling circuit and totem-pole bridgeless circuit system |
| CN212483676U (en) * | 2020-08-24 | 2021-02-05 | 长沙智汇芯智能科技有限公司 | Bidirectional current detection circuit |
-
2020
- 2020-08-24 CN CN202010855963.5A patent/CN111879994A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08103080A (en) * | 1994-09-29 | 1996-04-16 | Yutaka Denki Seisakusho:Kk | High input power factor power supply circuit and overvoltage protection circuit for said power supply |
| CN101738531A (en) * | 2009-12-31 | 2010-06-16 | 杭州凯尔达电焊机有限公司 | Method for detecting output current of inverting welding machine |
| CN102636676A (en) * | 2011-02-12 | 2012-08-15 | 中兴通讯股份有限公司 | Bridge-type current detecting circuit |
| CN204832315U (en) * | 2015-08-04 | 2015-12-02 | 广东爱迪贝克软件科技有限公司 | Two -way current detection circuit |
| CN206671401U (en) * | 2017-03-21 | 2017-11-24 | 中国长城科技集团股份有限公司 | A kind of current sampling circuit and without bridge commutation system |
| CN207601159U (en) * | 2017-12-14 | 2018-07-10 | 杰华特微电子（杭州）有限公司 | A kind of current detection circuit and switching circuit |
| CN110365216A (en) * | 2019-07-31 | 2019-10-22 | 上海军陶电源设备有限公司 | Current sampling circuit and full-bridge switching power supply circuit |
| CN111431423A (en) * | 2020-04-26 | 2020-07-17 | 深圳麦格米特电气股份有限公司 | Current sampling circuit and totem-pole bridgeless circuit system |
| CN212483676U (en) * | 2020-08-24 | 2021-02-05 | 长沙智汇芯智能科技有限公司 | Bidirectional current detection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640565A (en) * | 2021-07-26 | 2021-11-12 | 台达电子企业管理（上海）有限公司 | Current detection circuit, current detection method and converter |
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