CN209542689U - Hall current sensor with current-limiting protection function - Google Patents
Hall current sensor with current-limiting protection function Download PDFInfo
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- CN209542689U CN209542689U CN201920120445.1U CN201920120445U CN209542689U CN 209542689 U CN209542689 U CN 209542689U CN 201920120445 U CN201920120445 U CN 201920120445U CN 209542689 U CN209542689 U CN 209542689U
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Abstract
The utility model discloses a kind of Hall current sensors with current-limiting protection function; including closed loop Hall current sensor; the output end of the closed-loop Hall current sensor is in series with for limiting the excessive current-limiting protection circuit of secondary winding current in closed-loop Hall current sensor; the current-limiting protection circuit is connected with external power supply power supply, and the current-limiting protection circuit includes current-limiting resistance and three terminal regulator.The utility model limits the electric current of external power supply power supply by using simple circuit structure; and then limit Hall current sensor secondary output current; to protect secondary winding coil; it avoids it from damaging because power consumption is excessive, and avoids power supply from being pulled low because exporting high current and then influence other circuits normal work.
Description
Technical field
The utility model relates to sensor technical fields, are a kind of Hall electricity with current-limiting protection function specifically
Flow sensor.
Background technique
In recent years, Hall current sensor product is because of its good precision and the linearity, detection voltage and output signal height
The advantages that spending isolation, high reliability, low-power consumption, convenient maintenance and replacement, is widely used in Aeronautics and Astronautics, communication, instrument, metallurgy
And the military products such as railway, civilian goods field.
The working principle of closed loop Hall current sensor is as shown in Fig. 1, and according to Ampere's law, primary side is tested electric current
I1*N1The magnetic field B directly proportional to electric current will be generated1, the magnetosensitive chip in Open magnetic ring air gap directly measures the power of B1, output
A compensation electric current I is generated after the linear amplification of Hall voltage VH, VH2, I2Magnetic field, the magnetic are generated by secondary multicircuit winding again
Field and the magnetic field that primary tested electric current generates are exactly the opposite, to compensate to former magnetic field, after magnetic compensation in poly- magnetic coil
Magnetic field keeps equilibrium state, I1N1=I2N2, so having: I2=I1N1/N2, therefore work as N1/N2After determination, I2It is proportional to I1.Work as primary
When electric current overrate even overloads, secondary compensation electric current is even overloaded because linear relationship will increase in proportion, excessive benefit
It repays electric current and flows through secondary windings, so that secondary windings power loss increases, fever is serious, or even can blow winding；In addition it crosses
Big electric current can also drag down sensor supply voltage, and then influence the normal work of other circuits.In many applications, it is desirable that
When Hall current sensor has overload protection function, i.e. primary current overrate, output electric current may be limited to certain
One fixed value no longer increases with the increase of primary current, and then protects poly- magnetic coil winding not to be burned, while will not will pass
Sensor supply voltage drags down and then influences other circuits normal work.
Utility model content
The purpose of this utility model is to provide a kind of Hall current sensors with current-limiting protection function, in existing skill
Increase a current-limiting protection circuit on the basis of the closed-loop Hall current sensor circuit of art, to the electric current of external power supply into
Row limitation, when primary current overrate or overload, by limiting the electric current of power supply, so that Hall current senses
The output electric current of device is limited in a setting value.
The utility model is solved the above problems by following technical proposals:
A kind of Hall current sensor with current-limiting protection function, including closed-loop Hall current sensor, the closed loop
The output end of Hall current sensor is in series with for limiting the excessive limit of secondary winding current in closed-loop Hall current sensor
Stream protection circuit, the current-limiting protection circuit are connected with external power supply power supply.
Further, the current-limiting protection circuit includes current-limiting resistance and three terminal regulator, and the first of the current-limiting resistance
End is connect with the output end of the closed-loop Hall current sensor, the voltage of the second end of current-limiting resistance and the three terminal regulator
Output end connection, the first end connection of the adjustment end connection current-limiting resistance of three terminal regulator, the voltage input end of three terminal regulator
Connect the external power supply power supply.
Further, the current-limiting resistance uses multiple resistor coupled in parallel, and the resistance is fixed resistance or adjustable resistance.
Further, the current-limiting resistance is adjustable resistance.
The utility model compared with prior art, have the following advantages that and the utility model has the advantages that
The utility model limits the electric current of external power supply power supply by using simple circuit structure, and then limits Hall electricity
Flow sensor secondary output current avoids it from damaging because power consumption is excessive to protect secondary winding coil, and avoids power supply electricity
Source is pulled low because exporting high current and then influences other circuits normal work.
Detailed description of the invention
Fig. 1 is Hall current sensor schematic diagram in the prior art；
Fig. 2 is the principles of the present invention block diagram；
Fig. 3 is the schematic diagram of the current-limiting protection circuit of the utility model；
Wherein, U1- three terminal regulator.
Specific embodiment
The utility model is described in further detail below with reference to embodiment, but the embodiments of the present invention is not
It is limited to this.
Embodiment 1:
In conjunction with shown in attached drawing 2, a kind of Hall current sensor with current-limiting protection function, including closed loop Hall current are passed
Sensor, the output end of the closed-loop Hall current sensor are in series with for limiting secondary windings in closed-loop Hall current sensor
The excessive current-limiting protection circuit of electric current, the current-limiting protection circuit are connected with external power supply power supply.
Increase a current-limiting circuit on the basis of former Hall current sensor circuit, make its to the electric current of power supply into
Row limitation.When primary current overrate or overload, the electric current of power supply be will increase, and pass through limitation power supply
Electric current limits secondary winding current, protection time so that the output electric current of Hall current sensor is limited in a setting value
Grade winding avoids burning out because of overheat.
Embodiment 2:
On the basis of embodiment 1, in conjunction with shown in attached drawing 3, the current-limiting protection circuit includes current-limiting resistance R1 and three ends
Voltage-stablizer U1, the first end of the current-limiting resistance R1 are connect with the output end of the closed-loop Hall current sensor, current-limiting resistance
The second end of R1 is connect with the voltage output end of the three terminal regulator U1, and the adjustment end of three terminal regulator U1 connects current-limiting resistance
The first end of R1 connects, and the voltage input end of three terminal regulator U1 connects the external power supply power supply.Vcc is external power supply electricity
Pressure, generally+15V；Three terminal regulator U1 is the adjustable output positive voltage voltage-stablizer in three ends, uses chip LM317 in the present invention,
But be not limited only to this chip, three terminal regulator U1 output voltage is adjustable, maximum output current reach 1.5A, inside have current limit and
Thermal overload protection function；Vcc1 is the output voltage by three terminal regulator U1, for being that former Hall current passes to late-class circuit
Sensor power supply；Current-limiting resistance R1 is limitation current regulating resistance, can be used for adjusting current limit.Current limit can be expressed as:
ILIMIT=1.25V/R1 (1)
When the primary current of Hall current sensor is gradually increased, by formula (1) it is found that the electric current I2 of secondary coil is also same
Proportional linearity increases.When the electric current I2 for flowing through current-limiting resistance R1 increases to certain value, so that the voltage at the both ends R1 is more than 1.25V
When, i.e. when voltage difference between 1 foot and 2 feet of LM317 is more than 1.25V, LM317 will adjust the working condition of internal switch pipe,
The electric current flowed through is clamped firmly, to limit secondary winding current I2, protection secondary windings avoids burning out because of overheat.
It should be noted that the choosing value and encapsulation of R1, are considered as its power consumption.The maximum current of R1 is ILIMIT, maximum work
Consumption are as follows:
It should ensure that its maximum power dissipation is no more than its permissible value, and reserved margin, multiple resistor coupled in parallel may be selected, resistance can be adopted
With fixed resistance or adjustable resistance.
It is interior the following are the test data that the DC300A designed based on the present invention turns DC100mA direct current Hall current sensor
Portion's setting secondary current is limited to 250mA (R1 is that five 20 Ohmic resistances are in parallel), can satisfy 4 times of even more high power overloads and protects
Shield, test data are as shown in the table:
Table 1: test data table
It can be seen from the results that the Hall current sensor, in three times and four times of overloads, current-limiting protection function is overloaded just
Often, secondary output current is clamped.
Although reference be made herein to the utility model is described in the explanatory embodiment of the utility model, above-described embodiment
The only preferable embodiment of the utility model, the embodiments of the present invention are simultaneously not restricted to the described embodiments, it should
Understand, those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will be fallen
Within scope and spirit disclosed in the present application.
Claims (4)
1. a kind of Hall current sensor with current-limiting protection function, including closed-loop Hall current sensor, which is characterized in that
The output end of the closed-loop Hall current sensor is in series with for limiting secondary winding current in closed-loop Hall current sensor
Excessive current-limiting protection circuit, the current-limiting protection circuit are connected with external power supply power supply.
2. the Hall current sensor according to claim 1 with current-limiting protection function, which is characterized in that the current limliting
Protection circuit includes current-limiting resistance and three terminal regulator, the first end of the current-limiting resistance and the closed-loop Hall current sensor
Output end connection, the second end of current-limiting resistance connect with the voltage output end of the three terminal regulator, the tune of three terminal regulator
The first end connection of whole end connection current-limiting resistance, the voltage input end of three terminal regulator connect the external power supply power supply.
3. the Hall current sensor according to claim 2 with current-limiting protection function, which is characterized in that the current limliting
Resistance uses multiple resistor coupled in parallel, and the resistance is fixed resistance or adjustable resistance.
4. the Hall current sensor according to claim 2 with current-limiting protection function, which is characterized in that the current limliting
Resistance is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120445.1U CN209542689U (en) | 2019-01-24 | 2019-01-24 | Hall current sensor with current-limiting protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920120445.1U CN209542689U (en) | 2019-01-24 | 2019-01-24 | Hall current sensor with current-limiting protection function |
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| Publication Number | Publication Date |
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| CN209542689U true CN209542689U (en) | 2019-10-25 |
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| CN201920120445.1U Active CN209542689U (en) | 2019-01-24 | 2019-01-24 | Hall current sensor with current-limiting protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264864A (en) * | 2022-03-01 | 2022-04-01 | 北京智芯微电子科技有限公司 | Current detector and circuit |
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2019
- 2019-01-24 CN CN201920120445.1U patent/CN209542689U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264864A (en) * | 2022-03-01 | 2022-04-01 | 北京智芯微电子科技有限公司 | Current detector and circuit |
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