CN213398704U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN213398704U CN213398704U CN202022267552.2U CN202022267552U CN213398704U CN 213398704 U CN213398704 U CN 213398704U CN 202022267552 U CN202022267552 U CN 202022267552U CN 213398704 U CN213398704 U CN 213398704U
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Abstract
The utility model relates to a current detection circuit, which comprises a triode Q1, a resistor R9770, a resistor R9771, a resistor R9772 and a resistor R9773; one end of the resistor R9770 is connected with the base electrode of the triode Q1, and the other end of the resistor R9770 is connected with a voltage VDD; one end of the resistor R9771 is connected with the base electrode of the triode Q1, and the other end of the resistor R9771 is connected with the detection current input end B; one end of the resistor R9772 is connected with the detection current input end B, and the other end of the resistor R9772 is connected with an emitting electrode of the triode Q1; the emitter of the triode Q1 is grounded; one end of the resistor R9773 is connected to a voltage VDD, and the other end of the resistor R9773 is connected to a collector of the triode Q1. Compared with the prior art, the utility model discloses realize current detection, simple structure, it is with low costs, the current detection precision is high.
Description
Technical Field
The utility model relates to a current detection technical field, particularly, in particular to current detection circuit.
Background
Current detection or feedback is usually required in equipment such as a power supply, and the voltage of a series sampling resistor on an amplifying resistor through an amplifier is usually used for current detection; if the detection precision is to be improved, an expensive instrument amplifier is often used, and the offset voltage of the common operational amplifier is large, so that the cost is greatly increased. It is necessary to solve these problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. Therefore, an object of the utility model is to provide a current detection, simple structure, it is with low costs, current detection circuit that the current detection precision is high.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the current detection circuit comprises a triode Q1, a resistor R9770, a resistor R9771, a resistor R9772 and a resistor R9773;
one end of the resistor R9770 is connected with the base electrode of the triode Q1, and the other end of the resistor R9770 is connected with a voltage VDD;
one end of the resistor R9771 is connected with the base electrode of the triode Q1, and the other end of the resistor R9771 is connected with the detection current input end B;
one end of the resistor R9772 is connected with the detection current input end B, and the other end of the resistor R9772 is connected with an emitting electrode of the triode Q1; the emitter of the triode Q1 is grounded;
one end of the resistor R9773 is connected to a voltage VDD, and the other end of the resistor R9773 is connected to a collector of the triode Q1.
The utility model has the advantages that: the current detection is realized through the coordination operation of the triode Q1, the resistor R9770, the resistor R9771, the resistor R9772 and the resistor R9773, and the current detection device is simple in structure, low in cost and high in current detection precision.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the triode Q1 further comprises a diode D9302, the diode D9302 is connected in series between the resistor R9773 and the collector of the triode Q1, the anode of the diode D9302 is connected with the resistor R9773, and the cathode of the diode D9302 is connected with the collector of the triode Q1.
The beneficial effect of adopting the further scheme is that: diode D9302 is a light emitting diode, which acts as an indicator LED light.
Further, the resistance value of the resistor R9772 is 0.51 ohm.
The beneficial effect of adopting the further scheme is that: the resistance value of the resistor R9772 is 0.51 ohm, the resistance value is small, the consumed voltage is small, the current I can be detected, and the detection sensitivity is high.
Drawings
Fig. 1 is a schematic circuit diagram of the current detection circuit of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the current detection circuit includes a transistor Q1, a resistor R9770, a resistor R9771, a resistor R9772, and a resistor R9773;
one end of the resistor R9770 is connected with the base electrode of the triode Q1, and the other end of the resistor R9770 is connected with a voltage VDD;
one end of the resistor R9771 is connected with the base electrode of the triode Q1, and the other end of the resistor R9771 is connected with the detection current input end B;
one end of the resistor R9772 is connected with the detection current input end B, and the other end of the resistor R9772 is connected with an emitting electrode of the triode Q1; the emitter of the triode Q1 is grounded;
one end of the resistor R9773 is connected to a voltage VDD, and the other end of the resistor R9773 is connected to a collector of the triode Q1.
The detected current I is led in through a detection current input end B and flows back to the ground through a resistor R9772; the voltage generated on the resistor R9772 is superposed on the base of the triode Q1, so that the base voltage of the triode Q1 is changed along with the detected current I, and the base voltage of the triode Q1 is changed, so that the base current of the triode Q1 is changed; the change of the base current of the triode Q1 is amplified and output by the triode Q1, thereby achieving the purpose of current detection;
the resistance value of the resistor R9772 is small, the detected current I can be detected by consuming very small voltage, and the detection sensitivity is high; the detection sensitivity is adjusted by modifying the resistance values of the resistor R9770 and the resistor R9771; the voltage-dividing resistor is also sampled to stabilize the static working point of the triode Q1, so that the triode Q1 is in an amplification working area;
the current detection is realized through the coordination operation of the triode Q1, the resistor R9770, the resistor R9771, the resistor R9772 and the resistor R9773, and the current detection device is simple in structure, low in cost and high in current detection precision.
In the above embodiment, the transistor Q9302 further includes a diode D9302, the diode D9302 is connected in series between the resistor R9773 and the collector of the transistor Q1, the anode of the diode D9302 is connected to the resistor R9773, and the cathode of the diode D9302 is connected to the collector of the transistor Q1.
Diode D9302 is a light emitting diode, which acts as an indicator LED light.
In the above embodiment, the resistance of the resistor R9772 is 0.51 ohm.
The resistance value of the resistor R9772 is 0.51 ohm, the resistance value is small, the consumed voltage is small, the current I can be detected, and the detection sensitivity is high.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (3)
1. A current sensing circuit, characterized by: the circuit comprises a triode Q1, a resistor R9770, a resistor R9771, a resistor R9772 and a resistor R9773;
one end of the resistor R9770 is connected with the base electrode of the triode Q1, and the other end of the resistor R9770 is connected with a voltage VDD;
one end of the resistor R9771 is connected with the base electrode of the triode Q1, and the other end of the resistor R9771 is connected with the detection current input end B;
one end of the resistor R9772 is connected with the detection current input end B, and the other end of the resistor R9772 is connected with an emitting electrode of the triode Q1; the emitter of the triode Q1 is grounded;
one end of the resistor R9773 is connected to a voltage VDD, and the other end of the resistor R9773 is connected to a collector of the triode Q1.
2. The current sensing circuit of claim 1, wherein: the LED driving circuit further comprises a diode D9302, wherein the diode D9302 is connected between the resistor R9773 and the collector of the triode Q1 in series, the anode of the diode D9302 is connected with the resistor R9773, and the cathode of the diode D9302 is connected with the collector of the triode Q1.
3. The current sensing circuit of claim 1, wherein: the resistance of the resistor R9772 is 0.51 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022267552.2U CN213398704U (en) | 2020-10-13 | 2020-10-13 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022267552.2U CN213398704U (en) | 2020-10-13 | 2020-10-13 | Current detection circuit |
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|---|---|
| CN213398704U true CN213398704U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022267552.2U Active CN213398704U (en) | 2020-10-13 | 2020-10-13 | Current detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452155A (en) * | 2021-07-16 | 2021-09-28 | 黄石邦柯科技股份有限公司 | Self-adaptive starting optimal frequency wireless energy transfer device |
| CN113555970A (en) * | 2021-07-27 | 2021-10-26 | 黄石邦柯科技股份有限公司 | Wireless energy transfer device with stable output voltage |
-
2020
- 2020-10-13 CN CN202022267552.2U patent/CN213398704U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452155A (en) * | 2021-07-16 | 2021-09-28 | 黄石邦柯科技股份有限公司 | Self-adaptive starting optimal frequency wireless energy transfer device |
| CN113555970A (en) * | 2021-07-27 | 2021-10-26 | 黄石邦柯科技股份有限公司 | Wireless energy transfer device with stable output voltage |
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