Hall current sensor device with isolated power supply

Abstract

The utility model relates to a Hall current sensor device with an isolated power supply, which comprises an outer shell consisting of an upper shell and a lower shell, a first circuit board and a second circuit board are arranged in the outer shell, and the second circuit board is electrically connected with the first circuit board through a contact pin; the left and right sides of the top end of the first circuit board are respectively provided with a first Hall chip and a second Hall chip. A power supply module is arranged on the second circuit board; a power signal output terminal is arranged at the lower part of the first circuit board, and a plug is inserted into the power signal output terminal; the first circuit board is provided with a Hall chip power supply circuit, a signal conditioning circuit and a signal output circuit, and the second circuit board is provided with a positive power supply input circuit and an isolation power supply circuit. According to the utility model, signal output is isolated from a power supply, so that a post-stage receiving device of a user is protected; and only a positive power supply is needed, positive and negative power supplies are not needed, and the use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor circuit technical field especially relates to a hall current sensor device with isolated power supply. BACKGROUND

[0002] Hall sensor is the current sensor of commonly used, and the hall current sensor is made according to the principle of hall effect, and the ampere law is applied, that is, a magnetic field that is proportional to the current is generated around the current-carrying conductor, and the hall device is used to measure the magnetic field. Therefore, non-contact measurement of current is possible. At present, most hall current sensors have the following defects:

[0003] (1) the signal output of most hall current sensors is not isolated from the power supply, so that interference can be from the power supply, and the user's receiving device in the rear stage is damaged through the signal output circuit.

[0004] (2) most hall current sensors need positive and negative power supply, and additional switching power supply conversion is needed, which increases the cost. SUMMARY

[0005] The utility model discloses a kind of hall current sensor devices with isolated power supply, to overcome the above-mentioned problems.

[0006] The utility model discloses a kind of hall current sensor devices with isolated power supply, to overcome the above-mentioned problems.

[0007] A kind of hall current sensor device with isolated power supply, it includes the outer shell body of upper shell body and lower shell body, the recess of one semicircle ring is equipped in the upper shell body, the recess in the upper shell body is provided with upper magnetic core, the upper part of the lower shell body is provided with a semicircle ring recess of inversion, and the lower part is provided with a square recess, the semicircle ring recess and square recess are communicated, the semicircle ring recess in the lower shell body is provided with lower magnetic core, the square recess in the lower shell body is provided with first circuit board and second circuit board, the first circuit board and second circuit board are oppositely arranged, and the side of second circuit board is provided with a row of insertion pins, and second circuit board is electrically connected with first circuit board by insertion pin;The first hall chip and second hall chip are respectively arranged in the top end left and right sides of the first circuit board;Power module is equipped on the second circuit board;The lower part of the first circuit board is provided with power signal output terminal, and plug is inserted in the power signal output terminal;

[0008] The first circuit board is provided with a Hall chip power supply circuit, a signal conditioning circuit and a signal output circuit, the second circuit board is provided with a positive power input circuit and an isolation power supply circuit; the current signal is transmitted to the Hall chip through the magnetic core, the positive power input circuit is connected to the isolation power supply circuit, the isolation power supply circuit is connected to the Hall chip, the Hall chip is connected to the signal conditioning circuit, and the signal conditioning circuit is connected to the signal output circuit.

[0009] Further, the positive power input circuit includes a power chip IC2, the power chip IC2 is connected with a parallel-connected pressure-sensitive resistor RV1, a TVS tube D11, a capacitor C16 and a capacitor C17, an inductor L1 is arranged between one end of the pressure-sensitive resistor RV1 and the TVS tube D11, an inductor L3 is arranged between the other end, the inductor L1 is further connected with a diode D10 and a fuse F1 in series.

[0010] Further, a capacitor C15 is connected in series between a pin 1 and a pin 6 of the power chip IC2, an inductor L2 is further connected to the pin 6 of the power chip IC2, the inductor L2 is connected with a parallel-connected resistor R11, a capacitor C18 and a capacitor C19, and the resistor R11 and a resistor R12 are connected in series and then connected in parallel with the capacitor C18.

[0011] Further, the isolation power supply circuit includes a chip IC1 and a transformer T1, the chip IC1 is connected to an input pin of one side of the transformer T1, an output pin 5 of the other side of the transformer T1 is respectively connected to a diode D5 and a diode D9, an output pin 8 of one side of the transformer T1 is respectively connected to a diode D3 and a diode D7, the diode D3 and the diode D5 are connected, the diode D7 and the diode D9 are connected, and an output pin 7 of one side of the transformer T1 is respectively connected to a capacitor C13 and a capacitor C14.

[0012] Further, the capacitor C13 is respectively connected to the diode D3 and a TVS tube D4, the capacitor C14 is respectively connected to the diode D9 and a TVS tube D8, and the TVS tube D4 and the TVS tube D8 are respectively connected to two ends of a TVS tube D6.

[0013] Further, the Hall chip power supply circuit includes a chip U2, one side of the chip U2 is connected with a parallel-connected capacitor C8 and a capacitor C9, and the other side of the chip U2 is connected with a parallel-connected capacitor C10 and a capacitor C11.

[0014] Further, the signal output circuit comprises Hall chips H1 and H2 and an operational amplifier U1A, the Hall chip H1 is connected with a resistor R2, and the Hall chip H2 is connected with a resistor R6; the resistor R2 is connected with a resistor R3 and a capacitor C1 in parallel, and the resistor R2 is also connected with an inverting terminal of the operational amplifier U1A; the resistor R6 is connected with a resistor R7 and a capacitor C5 in parallel, and the resistor R6 is also connected with a non-inverting terminal of the operational amplifier U1A; an output terminal of the operational amplifier U1A is connected with a resistor R5, and the resistor R5 is connected with a capacitor C6 and a TVS tube D1 in parallel.

[0015] Further, the programming interface of the Hall chips H1 and H2 is an interface J1.

[0016] Compared with the prior art, the Hall current sensor device has the advantages that:

[0017] The Hall current sensor device provided by the utility model has the advantages that signal output is isolated from the power supply, interference from the power supply is prevented, a user's subsequent receiving device is protected, and the safety performance is higher.

[0018] The Hall current sensor device provided by the utility model has the advantages that only a positive power supply is needed, a positive and negative power supply is not needed, and a user does not need to use a switching power supply for conversion, so that the use cost is reduced, the use is more convenient, and the Hall current sensor is more conducive to wide application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a principle block diagram of the utility model.

[0021] Figure 3 It is a circuit principle diagram of the positive power supply input circuit of the utility model.

[0022] Figure 4 It is a circuit principle diagram of the isolated power supply circuit of the utility model.

[0023] Figure 5 It is a circuit principle diagram of the Hall chip power supply circuit of the utility model.

[0024] Figure 6 It is a circuit principle diagram of the signal output circuit of the utility model.

[0025] Among them:

[0026] The upper shell 1, the lower shell 2, the upper magnetic core 4, the lower magnetic core 5, the first circuit board 6, the second circuit board 7, the first Hall chip 8, the second Hall chip 9, the power supply module 10, the pin 11, the power supply signal output terminal 12 and the plug 13. DETAILED DESCRIPTION

[0027] For better understanding of the technical scheme of the utility model, the following will be combined with relevant drawing to make detailed description. It should be understood that the following specific embodiments are not used to limit the specific implementation of the technical scheme of the utility model, and it is only the implementation of the technical scheme of the utility model that can be used. It should be pointed out that the expression about the position relationship of each component in this paper, such as A component is located above B component, is based on the expression of the relative position of each component in the drawing, and is not used to limit the actual position relationship of each component. Embodiment 1

[0028] Referring to Figures 1-6 , Figure 1 The structure schematic diagram of the utility model is drawn. As shown in the figure, the utility model relates to a kind of hall current sensor device with isolated power supply, it includes the outer shell body of upper shell 1 and lower shell 2, the upper shell 1 and lower shell 2 are fixedly connected by screw and screw, the upper shell 1 is equipped with a semicircular annular groove, the recess of the upper shell 1 is provided with upper magnetic core 4, the upper part of the lower shell 2 is equipped with a inverted semicircular annular groove, and the lower part is equipped with a square recess, the semicircular annular groove and square recess are communicated, the semicircular annular groove of the lower shell 2 is provided with lower magnetic core 5, the square recess of the lower shell 2 is provided with first circuit board 6 and second circuit board 7, the first circuit board 6 and second circuit board 7 are oppositely arranged, and the side of second circuit board 7 is provided with a row of insertion pins 11, and the second circuit board 7 is electrically connected with first circuit board 6 by insertion pin 11.

[0029] The top end of the first circuit board 6 is provided with first hall chip 8 and second hall chip 9 respectively on the left and right sides.

[0030] The second circuit board 7 is provided with power module 10.

[0031] The lower part of the first circuit board 6 is provided with power signal output terminal 12, and plug 13 is inserted on the power signal output terminal 12.

[0032] Participate Figure 2 , Figure 2 It is the principle diagram of the utility model. As shown in the figure, the first circuit board 6 is provided with hall chip power supply circuit, signal conditioning circuit and signal output circuit, and the second circuit board 7 is provided with positive power input circuit and isolated power circuit.

[0033] Current signal is transmitted to hall chip by magnetic core magnetic aggregation, positive power input circuit is connected to isolated power circuit, isolated power circuit is connected to hall chip, hall chip is connected to signal conditioning circuit, and signal conditioning circuit is connected to signal output circuit.

[0034] Participate Figure 3 ,Figure 3 The utility model discloses a positive power input circuit's circuit principle diagram. As shown in the figure, the positive power input circuit includes power supply chip IC2, the power supply chip IC2 is connected and is in parallel pressure -sensitive resistance RV1, TVS pipe D11, electric capacity C16 and electric capacity C17, and the one end between pressure -sensitive resistance RV1 and TVS pipe D11 is arranged inductive L1 connection, and the other end is arranged inductive L3 connection, and inductive L1 still connects diode D10 and fuse F1 in series;Capacitor C15 is connected in series between the pin 1 and the pin 6 of the power supply chip IC2, and the pin 6 of the power supply chip IC2 is also connected inductive L2, and the inductive L2 is connected and is in parallel resistance R11, electric capacity C18 and C19, and the resistance R11 and resistance R12 are connected in series and then are connected in parallel with electric capacity C18.

[0035] Fuse F1, pressure -sensitive resistance RV1, TVS pipe D11, inductive L1, inductive L3 constitute the protection of power input EMC, and diode D10 prevents reverse connection for power input, and electric capacity C16, C17 filter for power input, and power supply chip IC2, resistance R11, R12, inductive L2 and capacitor C15 realize isolated voltage -stabilized output 5V power supply, and capacitor C18 and C19 are filter capacitors for 5V power output.

[0036] Participate Figure 4 , Figure 4 The utility model discloses an isolation power circuit's circuit principle diagram. As shown in the figure, the isolation power circuit includes chip IC1 and transformer T1, the chip IC1 connects the one side input pin of transformer T1, and the other side output pin 5 of transformer T1 is connected diode D5 and D9 respectively, and the one side output pin 8 of transformer T1 is connected diode D3 and D7 respectively, and diode D3 and D5 are connected, and diode D7 and D9 are connected, and the one side output pin 7 of transformer T1 is connected capacitor C13 and capacitor C14 respectively, and capacitor C13 is connected diode D3 and TVS pipe D4 respectively, and capacitor C14 is connected diode D9 and TVS pipe D8 respectively, and TVS pipe D4 and TVS pipe D8 are connected to the both ends of TVS pipe D6.

[0037] Chip IC1 inverts 5V power supply, converts into alternating current, and transformer T1 transmits the voltage after the inversion of 5V, and diode D3, D5, D7 and D9 rectify, and capacitor C13 is the filter capacitor of positive power supply, and capacitor C14 is the filter capacitor of negative power supply, and TVS pipe D4 clamps the positive power supply, and TVS pipe D8 clamps the negative power supply, and TVS pipe D6 clamps the voltage difference between the positive power supply and the negative power supply.

[0038] Participate Figure 5 , Figure 5The utility model relates to a circuit principle diagram of hall chip power supply circuit, as shown in the drawing, the hall chip power supply circuit includes chip U2, one side of chip U2 is connected with parallel capacitor C8 and C9, the other side is connected with parallel capacitor C10 and C11.

[0039] Capacitor C8 and C9 are filter capacitors of positive power supply, chip U2 converts the positive power supply into 5V power supply required by the hall chip power supply, and capacitor C10 and C11 are filter capacitors of 5V power supply output.

[0040] participate Figure 6 , Figure 6 The utility model relates to a circuit principle diagram of signal output circuit, as shown in the drawing, the signal output circuit includes hall chip H1 and H2 and operational amplifier U1A, and the programming interface of hall chip H1 and H2 is interface J1;Hall chip H1 is connected with resistance R2, and hall chip H2 is connected with resistance R6;Resistance R2 is connected with parallel resistance R3 and capacitor C1, and resistance R2 is also connected with the inverting terminal of operational amplifier U1A, and resistance R6 is connected with parallel resistance R7 and capacitor C5, and resistance R6 is also connected with the noninverting terminal of operational amplifier U1A;The output end of operational amplifier U1A is connected with resistance R5, and resistance R5 is connected with parallel capacitor C6 and TVS pipe D1.

[0041] Resistance R2, R3, R5, R6, R7 and operational amplifier U1A constitute differential amplification circuit and be responsible for converting the output signal of hall chip H1 and H2 into voltage output signal proportional to the measured current;Capacitor C6 is the filter capacitor of voltage output signal;TVS pipe D1 clamps voltage output signal and protects the later stage acquisition device.

[0042] Working principle:

[0043] The utility model relates to a kind of hall current sensor device with isolated power supply, power signal output terminal 12, first hall chip 8 and second hall chip 9 are welded on first circuit board 6, plug 13 is inserted into power signal output terminal 12, power module 10 and pin 11 are welded on second circuit board 7, second circuit board 7 is welded on first circuit board 6 by pin 11;Lower magnetic core 5, first circuit board 6 and second circuit board 7 are loaded into lower shell 2, then upper magnetic core 4 is loaded into upper shell 1, screw is inserted into the perforation of upper shell 1 and lower shell 2 connection, so that upper shell 1 and lower shell 2 are combined together, then screw is tightened and fixed to the opening of upper shell 1 and lower shell 2;Finally, glue is poured into upper shell 1 and lower shell 2, and components are fixed.

[0044] The power signal output terminal 12 is a power supply and signal output terminal of the sensor, the power module 10 converts the positive power supply into a positive and negative power supply and transmits to the first circuit board 6 through the pin 11 to supply power to the first Hall chip 8, the second Hall chip 9 and the signal conditioning circuit.

[0045] The upper magnetic core 4 and the lower magnetic core 5 concentrate the magnetic field generated by the current, the first Hall chip 8 and the second Hall chip 9 output corresponding voltage signals by inducting the current magnetic field in the air gap of the upper magnetic core 4 and the lower magnetic core 5 and transmit to the signal conditioning circuit on the first circuit board 6, finally complete the output of the signal.

[0046] The above is only a specific application example of the utility model, and does not constitute any limitation on the protection scope of the utility model. Any technical scheme formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A Hall current sensor device equipped with an isolated power supply, characterized in that: The housing comprises an upper housing (1) and a lower housing (2). The upper housing (1) has a semi-circular annular groove, and an upper magnetic core (4) is disposed in the groove. The lower housing (2) has an inverted semi-circular annular groove at the top and a square groove at the bottom. The semi-circular annular groove and the square groove are connected. A lower magnetic core (5) is disposed in the semi-circular annular groove of the lower housing (2). A first circuit board (6) and a second circuit board (7) are disposed in the square groove of the lower housing (2). The first circuit board (6) The second circuit board (7) is arranged opposite to the first circuit board (6), and a row of pins (11) is provided on the side of the second circuit board (7). The second circuit board (7) is electrically connected to the first circuit board (6) through the pins (11). The first circuit board (6) has a first Hall chip (8) and a second Hall chip (9) respectively on the top left and right sides. The second circuit board (7) is provided with a power module (10). The lower part of the first circuit board (6) is provided with a power signal output terminal (12), and a plug (13) is inserted into the power signal output terminal (12). The first circuit board (6) is provided with a Hall chip power supply circuit, a signal conditioning circuit and a signal output circuit, and the second circuit board (7) is provided with a positive power input circuit and an isolation power supply circuit. The current signal is transmitted to the Hall chip through the magnetic core. The positive power input circuit is connected to the isolation power supply circuit, the isolation power supply circuit is connected to the Hall chip, the Hall chip is connected to the signal conditioning circuit, and the signal conditioning circuit is connected to the signal output circuit.

2. The Hall current sensor device with isolated power supply according to claim 1, characterized in that: The positive power input circuit includes a power chip IC2. The power chip IC2 is connected in parallel with a varistor RV1, a TVS diode D11, a capacitor C16, and a capacitor C17. An inductor L1 is provided between one end of the varistor RV1 and the TVS diode D11, and an inductor L3 is provided between the other ends. The inductor L1 is also connected in series with a diode D10 and a fuse F1.

3. A Hall current sensor device with isolated power supply according to claim 2, characterized in that: A capacitor C15 is connected in series between pin 1 and pin 6 of the power chip IC2. An inductor L2 is also connected to pin 6 of the power chip IC2. The inductor L2 is connected in parallel with a resistor R11, a capacitor C18, and a capacitor C19. The resistor R11 and the resistor R12 are connected in series and then in parallel with the capacitor C18.

4. A Hall current sensor device with isolated power supply according to claim 1, characterized in that: The isolated power supply circuit includes a chip IC1 and a transformer T1. The chip IC1 is connected to one input pin of the transformer T1. The output pin 5 on the other side of the transformer T1 is connected to diodes D5 and D9 respectively. The output pin 8 on one side of the transformer T1 is connected to diodes D3 and D7 respectively. Diodes D3 and D5 are connected together, and diodes D7 and D9 are connected together. The output pin 7 on one side of the transformer T1 is connected to capacitors C13 and C14 respectively.

5. A Hall current sensor device with isolated power supply according to claim 4, characterized in that: Capacitor C13 is connected to diode D3 and TVS diode D4 respectively, capacitor C14 is connected to diode D9 and TVS diode D8 respectively, and TVS diodes D4 and D8 are connected to the two ends of TVS diode D6 respectively.

6. A Hall current sensor device with isolated power supply according to claim 1, characterized in that: The Hall chip power supply circuit includes a chip U2, with capacitors C8 and C9 connected in parallel on one side and capacitors C10 and C11 connected in parallel on the other side.

7. A Hall current sensor device with isolated power supply according to claim 1, characterized in that: The signal output circuit includes Hall effect chips H1 and H2 and operational amplifier U1A. Hall effect chip H1 is connected to resistor R2, and Hall effect chip H2 is connected to resistor R6. Resistor R2 is connected to resistor R3 and capacitor C1 in parallel, and resistor R2 is also connected to the inverting input of operational amplifier U1A. Resistor R6 is connected to resistor R7 and capacitor C5 in parallel, and resistor R6 is also connected to the non-inverting input of operational amplifier U1A. The output terminal of operational amplifier U1A is connected to resistor R5, and resistor R5 is connected to capacitor C6 in parallel and TVS diode D1.

8. A Hall current sensor device with isolated power supply according to claim 7, characterized in that: The programming interface for the Hall chips H1 and H2 is interface J1.

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