CN203039659U - Hall direct current overcurrent inductive switch - Google Patents
Hall direct current overcurrent inductive switch Download PDFInfo
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- CN203039659U CN203039659U CN 201320016717 CN201320016717U CN203039659U CN 203039659 U CN203039659 U CN 203039659U CN 201320016717 CN201320016717 CN 201320016717 CN 201320016717 U CN201320016717 U CN 201320016717U CN 203039659 U CN203039659 U CN 203039659U
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- inductive switch
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Abstract
The utility model discloses a Hall direct current overcurrent inductive switch. The inductive switch comprises a direct current induction module, a voltage comparison and follow circuit, and a signal output circuit, wherein the direct current induction module comprises a magnetism gathering ring with an opening and a linear Hall circuit fixed on the opening of the magnetism gathering ring with an opening, and the linear Hall circuit, the voltage comparison and follow circuit and the signal output circuit are connected in sequence. The Hall direct current overcurrent inductive switch is simple in circuit, low in cost, small in temperature excursion, small in return difference, high in precision, and stable and reliable in work, has an LED status indicator light, and a current action threshold is adjustable.
Description
Technical field
The utility model relates to the current transformation field, particularly a kind of Hall direct current overcurrent inductive switch as the monitoring of industrial field device running status length of run or Based Intelligent Control.
Background technology
In electric equipment, use under the situation of DC power supply as power supply; in order to use safety; usually come DC power supply output to carry out overcurrent protection to serial connection DC over current protector in the DC loop of electric equipment power supply, as adopting DC over current protector such as air switch, magnetic circuit breaker, fuse.Surpass design current when big (as greater than a certain predetermined threshold value) at certain road electric current, this DC over current protector can this loop of automatic disconnection.Recent years, along with the appearance of all kinds of direct current transmitters, transmitter constitutes the new DC overcurrent protector in conjunction with microprocessor and D.C. contactor etc.Use the direct current transmitter to monitor certain road circuit, export to microprocessor through current conversion, whether microprocessor judges greater than predefined current threshold, if greater than, then send signal and drive the D.C. contactor action or send other warning signals.Like this, to reach the purpose of protection electrical network, DC power system.
Therefore, require DC over current protector can detect, report the operating state of DC over current protector to give the Local or Remote user in real time, with convenient administering and maintaining protected electric equipment.Yet all there are some problems in this two classes DC over current protector, mainly shows:
1) directly is connected on DC over current protector in the DC loop, is the circuit protection unit that rapid wear or state easily switch.As irrecoverable fuse, DC loop one overcurrent, fuse failure need be changed fuse again, and DC loop is worked on.In addition, the easy misoperation of air switch and magnetic circuit breaker.
2) the direct current overcurrent protective device that is constituted by direct current transmitter, microprocessor, D.C. contactor etc., though functional, practicality is stronger, and its cost is higher, and current threshold is unadjustable, and this has just limited the popularization of this scheme.
More than two kinds of DC over current protector owing to there are these problems, limited the application in DC loop (as the direct current machine overcurrent protection).
Summary of the invention
Technical problem to be solved in the utility model is; at the prior art deficiency; a kind of Hall direct current overcurrent inductive switch is provided; size according to electric current in the DC loop; change the output state of solid-state switch; under realization and other direct current overcurrent protective device same functions and the adjustable prerequisite of current threshold, reduce cost.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of Hall direct current overcurrent inductive switch, comprise direct current induction module, voltage ratio and follow circuit, signal output apparatus, described direct current induction module comprises an opening magnetism gathering rings and is fixed on linear Hall circuit on the described opening magnetism gathering rings opening; Described linear Hall circuit, voltage ratio are connected successively with follow circuit, signal output apparatus.
As preferred version, described voltage ratio and the follow circuit employing be integrated with the amplifier chip of two operational amplifiers, described two operational amplifiers are used separately as voltage comparator and voltage follower.
As preferred version, described signal output apparatus comprises power supply, two indicator lights that are connected with described power supply, the metal-oxide-semiconductor of two series connection, first indicator light is connected with power supply ground by a triode, second indicator light is connected with power supply ground by a diode, described voltage comparator output is received the grid of two metal-oxide-semiconductors, the output of described voltage follower is received the base stage of described triode, and the drain electrode of described two metal-oxide-semiconductors respectively is connected with an output port.
The size of linear Hall circuit induction punching direct current, its output voltage changes and linear change with the punching electric current, compares with predefined electric current action threshold value, changes the output state of a solid-state switch, and solid-state switch is made up of two metal-oxide-semiconductors.
In concrete product is implemented, only need two operational amplifier integrated circuits, Hall circuit, opening magnetism gathering rings, and two metal-oxide-semiconductors etc. and a small amount of peripheral cell get final product, be convenient to realization.
Compared with prior art, the beneficial effect that the utility model has is: the utility model circuit structure is simple, cost is low, temperature float little, return difference is little, accuracy is high, working stability is reliable, and the led state indicator light is arranged, electric current action threshold value is adjustable.
Description of drawings
Fig. 1 is the utility model one embodiment direct current induction module schematic diagram;
Fig. 2 be the utility model one embodiment voltage ratio and follow circuit, signal output apparatus schematic diagram;
Fig. 3 uses schematic diagram for the utility model one embodiment.
Embodiment
As depicted in figs. 1 and 2, the utility model one embodiment comprises direct current induction module, voltage ratio and follow circuit, signal output apparatus, and described direct current induction module comprises an opening magnetism gathering rings 1 and is fixed on linear Hall circuit 2 on described opening magnetism gathering rings 1 opening; Described linear Hall circuit 2, voltage ratio are connected successively with follow circuit, signal output apparatus, and wherein to receive the middle label of Fig. 2 be on the IN circuit in the output of Fig. 1 neutral line Hall circuit 2.
As shown in Figure 1, when a lead flows through electric current, around lead, can produce magnetic field.When electric current was direct current, the magnetic field of generation was to stablize constant magnetic field.The effect of opening magnetism gathering rings is exactly, and the magnetic field of certain scope around the lead is gathered together, and concentrates the linear Hall that acts among the figure, improves the sensitivity to electric current.Magnetism gathering rings is that the silicon steel sheet of thinner thickness is formed by stacking.What adopt here is the tripod linear Hall circuit, three pins wherein, and one is positive supply, and one is negative supply, and one is voltage output, and its quiescent output voltage is: (positive voltage+negative voltage)/2.
Referring to Fig. 2, this part is the circuit theory diagrams of Hall direct current overcurrent inductive switch (often be output as and open).To the supply power voltage voltage stabilizing, give the power supply of amplifier and linear Hall earlier.The amplifier of two amplifier chip U1 is used as the voltage comparator use, and an amplifier is used as voltage follower and is used.Such circuit design can be saved a metal-oxide-semiconductor, and isolates pilot lamp loop and solid-state switch loop.
At first by the voltage on 2 pin of adjustable potentiometer VR1 adjusting amplifier U1,3 pin of amplifier U1 are received in linear Hall output through R3.When the voltage of 2 pin during greater than the voltage of 3 pin, when namely the punching electric current did not reach electric current action threshold value, because of the 1 pin output low level of U1, triode Q1 did not have conducting.This moment, LED light D5 was bright, and D6 goes out, and metal-oxide-semiconductor Q2, Q3 also turn-off, output port L1, not conducting of L2.When the punching electric current increases the corresponding increase of linear Hall output voltage.When the voltage on 3 pin during greater than the voltage on 2 pin, 1 pin of U1 changes high level into by low level, triode Q1 conducting, and LED light D5 goes out, and D6 is bright, also conducting of metal-oxide-semiconductor Q2, Q3, output port L1, L2 conducting.
With checking feasibility of the present invention, existing parameter to the various elements in the circuit designs, and makes finished product to simplify the analysis.
The concrete specification of opening magnetism gathering rings is external diameter R:35mm, internal diameter r:25mm, highly: 10mm, A/F h:2mm, material: thickness is the silicon steel sheet of 0.23mm.
Linear Hall adopts the 49E linear Hall circuit here, and 49E Hall low price, volume is little, accuracy is high, highly sensitive, good linearity, temperature stability is good, reliability is high, and maximum working voltage can be 9V.Here for improving the sensitivity of 49E, giving the voltage of 49E is 8V, and then its static state is output as about 4V.Cooperate the opening magnetism gathering rings, just every variations of punching electric current 50A, then the output voltage of 49E changes 1V, because 49E is under the 8V electric power thus supplied, maximum voltage is exported and can be reached about 7V, the maximum punching electric current that just can measure is 150A.
In order to increase the scope to the supply power voltage of inductive switch, here adopt linear voltage stabilization chip LM317, work as R1=220, during R2=1.2k, output voltage is: 1.25*(1+R2/R1)=and 8.07V, then input voltage can be 10V to the direct voltage of 30V, and wherein Shu Chu 8V power voltage supply is given amplifier and 49E Hall circuit.
Two amplifier chips adopt LM358, LM358 inside include two independently, the dual operational amplifier of high-gain, internal frequency compensation, be suitable as voltage comparator and use.
Provided the parameter of other main elements below and briefly introduced.
R4=100k, the range of VR1 are 100k, R8=10k, and R3, R4, R8 get these resistances, are in order to obtain about the minimum 4V of the inverting input of voltage comparator, to be up to about 7.5V, and this also meets the output characteristic of 49E linear Hall electric wire.R3=10k, R5=100k, R6=10k, R7=200k, wherein the power of each resistance is 0.25W, error is 0.5% 5 loop resistances.Triode Q1 is 2N3904, and metal-oxide-semiconductor Q2, Q3 are BSP297, and the BSP297 on state current can reach 0.65A, and under the blocking-up situation, the voltage of drain-to-source can reach 200V, and on state resistance has only 2
According to these parameters, make product, according to Fig. 3 wiring, and actual measurement.Major loop among Fig. 3 is the DC loop that will monitor, comprises direct voltage source, major loop load etc., and the major loop circuit passes product (direction that attention is passed), and direct voltage source is given the power supply of Hall direct current overcurrent inductive switch.Load circuit comprises load power source and load equally, and load can be buzzer, relay coil etc.; Load circuit also can be to insert microprocessor, a termination microprocessor internal power supply, the I/O mouth of another termination microprocessor.When the electric current in the major loop increased to predefined electric current action threshold value, the output state of two binding posts (dry contact) of load circuit changed.If solid-state switch is for often leaving node, then load is started working or the I/O mouth of microprocessor is high level; If solid-state switch is normally closed node, then load I/O mouth out of service or microprocessor is low level.The direct current punching electric current that Hall direct current overcurrent inductive switch can be sensed can be as small as 0.3A, and maximum continuous operation electric current can reach 150A.Maximum load can arrive 0.35A/130V AC/DC, the electric current return difference less than the 3%(actual measurement to a class value: the punching electric current that solid-state switch is just in time opened is 3A, and when reducing the punching electric current to 2.95A again, solid-state switch cuts out; Then return difference is:
).The temperature characterisitic of sample is good, and temperature is floated and is no more than 3%.
Claims (4)
1. Hall direct current overcurrent inductive switch, comprise direct current induction module, voltage ratio and follow circuit, signal output apparatus, it is characterized in that described direct current induction module comprises an opening magnetism gathering rings and the linear Hall circuit that is fixed on the described opening magnetism gathering rings opening; Described linear Hall circuit, voltage ratio are connected successively with follow circuit, signal output apparatus.
2. Hall direct current overcurrent inductive switch according to claim 1 is characterized in that described linear Hall circuit is the tripod linear Hall circuit.
3. Hall direct current overcurrent inductive switch according to claim 1, it is characterized in that, described voltage ratio and the follow circuit employing be integrated with the amplifier chip of two operational amplifiers, described two operational amplifiers are used separately as voltage comparator and voltage follower.
4. Hall direct current overcurrent inductive switch according to claim 3, it is characterized in that, described signal output apparatus comprises power supply, two indicator lights that are connected with described power supply, the metal-oxide-semiconductor of two series connection, first indicator light is connected with power supply ground by a triode, second indicator light is connected with power supply ground by a diode, described voltage comparator output is received the grid of two metal-oxide-semiconductors, the output of described voltage follower is received the base stage of described triode, and the drain electrode of described two metal-oxide-semiconductors respectively is connected with an output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320016717 CN203039659U (en) | 2013-01-14 | 2013-01-14 | Hall direct current overcurrent inductive switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320016717 CN203039659U (en) | 2013-01-14 | 2013-01-14 | Hall direct current overcurrent inductive switch |
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| Publication Number | Publication Date |
|---|---|
| CN203039659U true CN203039659U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320016717 Expired - Lifetime CN203039659U (en) | 2013-01-14 | 2013-01-14 | Hall direct current overcurrent inductive switch |
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| CN (1) | CN203039659U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266299A (en) * | 2019-06-18 | 2019-09-20 | 麦歌恩电子(上海)有限公司 | Magnetic switch chip |
| CN111556409A (en) * | 2020-05-22 | 2020-08-18 | 上海创功通讯技术有限公司 | Microphone control circuit and electronic equipment |
-
2013
- 2013-01-14 CN CN 201320016717 patent/CN203039659U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266299A (en) * | 2019-06-18 | 2019-09-20 | 麦歌恩电子(上海)有限公司 | Magnetic switch chip |
| CN110266299B (en) * | 2019-06-18 | 2023-05-16 | 麦歌恩电子(上海)有限公司 | Magnetic switch chip |
| CN111556409A (en) * | 2020-05-22 | 2020-08-18 | 上海创功通讯技术有限公司 | Microphone control circuit and electronic equipment |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |
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| CX01 | Expiry of patent term |