CN212483676U - Bidirectional current detection circuit - Google Patents
Bidirectional current detection circuit Download PDFInfo
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- CN212483676U CN212483676U CN202021778371.XU CN202021778371U CN212483676U CN 212483676 U CN212483676 U CN 212483676U CN 202021778371 U CN202021778371 U CN 202021778371U CN 212483676 U CN212483676 U CN 212483676U
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Abstract
The utility model provides a two-way current detection circuit, 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, the beneficial effects of the utility model reside in 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 utility model relates to a current detection technique especially relates to a two-way current detection circuit.
[ 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.
[ Utility model ] content
The present invention is directed to solving the above problems of the current detection circuit, and to providing a bidirectional current detection circuit.
The utility model discloses a realize through 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 beneficial effects of the utility model reside in 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 the structure of the bidirectional current detection circuit of the present invention;
fig. 2 is a schematic structural diagram of the bidirectional current detection circuit of the present invention, in which two switching devices of one bridge arm of the full-bridge rectifier are replaced with two bidirectional switches and the detection switch tube is cancelled;
fig. 3 is a schematic structural diagram of the bidirectional current detection circuit of the present invention, in which two switching devices of two upper bridge arms of a full-bridge rectifier are replaced with two bidirectional switches and a detection switching tube is omitted;
fig. 4 is a schematic structural diagram of the bidirectional current detection circuit of the present invention, in which two switching devices of two lower bridge arms of a full-bridge rectifier are replaced with two bidirectional switches and a detection switch tube is omitted;
fig. 5 is a schematic structural diagram of the bidirectional current detection circuit of the present invention in which four switching devices of a full-bridge rectifier are replaced with four diodes;
fig. 6 is a schematic structural diagram of the bidirectional current detection circuit of the present invention, in which a full-bridge rectifier is replaced by a center-tapped full-wave rectifier composed of two switching devices;
fig. 7 is a schematic structural diagram of the bidirectional current detection circuit of the present invention, in which a full-bridge rectifier is replaced by a center-tapped full-wave rectifier composed of two diodes;
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 will be further described with reference to the accompanying drawings and specific embodiments:
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 changes to the present invention should fall within the protection 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 (3)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021778371.XU CN212483676U (en) | 2020-08-24 | 2020-08-24 | Bidirectional current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021778371.XU CN212483676U (en) | 2020-08-24 | 2020-08-24 | Bidirectional current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212483676U true CN212483676U (en) | 2021-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021778371.XU Active CN212483676U (en) | 2020-08-24 | 2020-08-24 | Bidirectional current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212483676U (en) |
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2020
- 2020-08-24 CN CN202021778371.XU patent/CN212483676U/en active Active
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