CN217692664U - Integrated circuit with detection function - Google Patents

Integrated circuit with detection function Download PDF

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CN217692664U
CN217692664U CN202220955915.8U CN202220955915U CN217692664U CN 217692664 U CN217692664 U CN 217692664U CN 202220955915 U CN202220955915 U CN 202220955915U CN 217692664 U CN217692664 U CN 217692664U
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common
circuit
mode
differential
voltage
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朱远
郑刚
孙赫然
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Beijing Wangda Shijia Technology Development Co ltd
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Beijing Wangda Shijia Technology Development Co ltd
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Abstract

The utility model discloses an integrated circuit with detect function, including elementary protection circuit, secondary protection circuit and detection circuitry, elementary protection circuit is connected with secondary protection circuit, secondary protection circuit is connected with detection circuitry. The utility model discloses a primary protection circuit and secondary protection circuit's duplicate protection mode realizes effectively resisting surge voltage, reduces surge voltage to integrated circuit's harm, and guarantee circuit safety effectively monitors and resists through the coupling effect of detection circuitry in to the circuit, reduces the influence of circuit secondary coupling effect to integrated circuit.

Description

Integrated circuit with detection function
Technical Field
The utility model relates to an integrated electronic circuit technical field, concretely relates to integrated circuit with detect function.
Background
The influence and harm of surge voltage to electronic equipment are inevitable in the working and use process of the electronic equipment, and the surge voltage can cause interference and damage to the equipment through a main power supply line, a signal line, an antenna feeder line and the like. In general, the surge voltage can be divided into the following two types in terms of form:
first, internally induced low energy transient voltage surges. Such as surge voltages caused by switching operations and externally induced voltage surges that are typically coupled into systems and equipment in extremely powerful, high-energy forms.
Second, the discharge of electrostatically charged system components, contact with high voltage lines, and electromagnetic pulses (EMP or NEMP) that occur during nuclear explosions, the largest loads typically being caused by voltage surges caused by lightning strikes that produce peak currents in excess of 10 kA.
In more accurate electronic equipment, when operating equipment is controlled or wiring of a line is adjusted, operation interruption or damage of connecting equipment is often caused, and once the equipment is damaged, the maintenance difficulty is high and the maintenance cost is huge.
At present, design planning on a protection circuit is lacked in various integrated circuits, even if the integrated circuits are mainly connected with outdoor measurement cables, the most basic protection measures are always lacked, and the devices are difficult to resist the influence of surge voltage in application. In addition, when the protection circuit works in practice, even though the impact of various surge currents is effectively resisted, the circuit still may be influenced by external coupling action, such as mutual inductance coupling, capacitive coupling, ground wire coupling and the like (as shown in fig. 1), and secondary influence action is exerted on the circuit. Therefore, the effect of resisting surge voltage can be effectively achieved only by correctly planning the circuit and reasonably designing the circuit.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides an integrated circuit with detect function to reduce surge voltage to integrated circuit's harm.
An integrated circuit with a detection function comprises a primary protection circuit, a secondary protection circuit and a detection circuit, wherein the primary protection circuit is connected with the secondary protection circuit, and the secondary protection circuit is connected with the detection circuit.
Preferably, the primary protection circuit comprises a surge voltage release unit and an interference filtering unit, wherein one side of the surge voltage release unit is connected with a voltage input end of the integrated circuit, and the other side of the surge voltage release unit is connected with the interference filtering unit.
Preferably, the surge voltage release unit comprises a first voltage dependent resistor, a second voltage dependent resistor, a third voltage dependent resistor and a gas discharge tube, wherein the first end of the first voltage dependent resistor is connected with the voltage negative input end of the integrated circuit, the first end of the second voltage dependent resistor, the first end of the third voltage dependent resistor and the interference filtering unit, the second end of the first voltage dependent resistor is connected with the second end of the second voltage dependent resistor and one end of the gas discharge tube, the other end of the gas discharge tube is grounded, and the second end of the third voltage dependent resistor is connected with the voltage positive input end of the integrated circuit and the interference filtering unit.
Preferably, the interference filtering unit includes a harmonic filtering circuit, a differential mode current filtering circuit and a first differential mode voltage filtering circuit, the harmonic filtering circuit is connected to the differential mode current filtering circuit, and the differential mode current filtering circuit is connected to the first differential mode voltage filtering circuit.
Preferably, the harmonic filter circuit includes a first common mode capacitor, the first common mode capacitor is connected in parallel between the third voltage dependent resistor and the differential mode current filter circuit, and the first common mode capacitor is further connected to ground.
Preferably, the differential mode current filtering circuit includes a first differential mode inductor and a second differential mode inductor, the first differential mode inductor is connected in series to a positive voltage input terminal line of the integrated circuit, and the second differential mode inductor is connected in series to a negative voltage input terminal line of the integrated circuit.
Preferably, the first differential mode voltage filtering circuit includes a first differential mode capacitor, a second common mode capacitor and a third common mode capacitor, one end of the first differential mode capacitor is connected to the first differential mode inductor, the other end of the first differential mode capacitor is connected to the second differential mode inductor, the second common mode capacitor is connected in series with the third common mode capacitor and then connected in parallel to the first differential mode capacitor, and the second common mode capacitor and the third common mode capacitor are both grounded.
Preferably, the secondary protection circuit includes a first common-mode inductor and a second differential-mode voltage filter circuit, the second differential-mode voltage filter circuit includes a second differential-mode capacitor, a fourth common-mode capacitor and a fifth common-mode capacitor, a 1 st pin of the first common-mode inductor is connected to one end of the second common-mode capacitor, a 2 nd pin of the first common-mode inductor is connected to one end of the second differential-mode capacitor, a 3 rd pin of the first common-mode inductor is connected to one end of the third common-mode capacitor, a 4 th pin of the first common-mode inductor is connected to the other end of the second differential-mode capacitor, the fourth common-mode capacitor is connected in parallel to the second differential-mode capacitor after being connected in series to the fifth common-mode capacitor, and the fourth common-mode capacitor and the fifth common-mode capacitor are both grounded.
Preferably, the detection circuit includes a detection current limiting circuit, the detection current limiting circuit includes a third differential mode inductor, a fourth differential mode inductor, a sixth common mode capacitor, a seventh common mode capacitor, and a third differential mode capacitor, one end of the third differential mode inductor is connected to a 2 nd pin of the first common mode inductor, the other end of the third differential mode inductor is connected to one end of the sixth common mode capacitor, one end of the fourth differential mode inductor is connected to a 4 th pin of the first common mode inductor, the other end of the fourth differential mode inductor is connected to one end of the seventh common mode capacitor, the other end of the sixth common mode capacitor is connected to the other end of the seventh common mode capacitor and one end of the third differential mode capacitor, and the other end of the third differential mode capacitor is grounded.
Preferably, the detection circuit further comprises a first contactless switch potentiometer, a second contactless switch potentiometer and a signal processor, wherein one end of the first contactless switch potentiometer is connected with the other end of the third differential mode inductor, the other end of the first contactless switch potentiometer is connected with the signal processor, one end of the second contactless switch potentiometer is connected with the other end of the fourth differential mode inductor, and the other end of the second contactless switch potentiometer is connected with the signal processor.
The beneficial effects of the utility model are embodied in: the dual protection mode of the primary protection circuit and the secondary protection circuit is adopted, so that the surge voltage is effectively resisted, the damage of the surge voltage to the integrated circuit is reduced, the circuit safety is guaranteed, the coupling effect in the circuit is effectively monitored and resisted through the detection circuit, and the influence of the secondary coupling effect of the circuit on the integrated circuit is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of the external coupling effect of the circuit provided in the background of the present invention;
fig. 2 is a block diagram of an integrated circuit with a detection function according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an integrated circuit with a detection function according to an embodiment of the present invention.
In the figure, 1-a primary protection circuit, 2-a secondary protection circuit, 3-a detection circuit, 11-a surge voltage release unit, 12-an interference filtering unit, 21-a second differential mode voltage filtering circuit and 31-a detection current limiting circuit.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only used as examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
As shown in fig. 2, an integrated circuit with a detection function includes a primary protection circuit, a secondary protection circuit, and a detection circuit, wherein the primary protection circuit is connected to the secondary protection circuit, and the secondary protection circuit is connected to the detection circuit.
Further, as shown in fig. 3, the primary protection circuit 1 includes a surge voltage release unit 11 and an interference filtering unit 12, one side of the surge voltage release unit 11 is connected to a voltage input terminal of the integrated circuit, the other side of the surge voltage release unit 11 is connected to the interference filtering unit 12, and the voltage input terminal of the integrated circuit includes a voltage positive input terminal VP and a voltage negative input terminal VN.
Wherein, surge voltage release unit 11 includes first piezo-resistor R1, second piezo-resistor R2, third piezo-resistor R3 and gas discharge tube GDT, first end and integrated circuit's voltage negative direction input VN of first piezo-resistor R1, second piezo-resistor R2's first end, third piezo-resistor R3's first end and interference filter unit 12 are connected, first piezo-resistor R1's second end and second piezo-resistor R2's second end and gas discharge tube GDT's one end are connected, gas discharge tube GDT's other end ground connection, third piezo-resistor R3's second end and integrated circuit's voltage positive direction input VP and interference filter unit 12 are connected.
Specifically, when the integrated circuit is at a normal working voltage, the piezoresistors are in a high-resistance state, when surge voltage applied to a voltage input end of the integrated circuit exceeds a preset threshold, the first piezoresistor R1, the second piezoresistor R2 and the third piezoresistor R3 are strongly influenced by voltage, current flowing through the first piezoresistor R1, the second piezoresistor R2 and the third piezoresistor R3 can rapidly rise along with rise of the voltage, a rising curve is a nonlinear index, the current can be connected with the gas discharge tube GDT through the three piezoresistors to release the surge voltage, the gas discharge tube GDT can rapidly respond and release energy, and accordingly the rapid rising surge voltage can be resisted.
Further, the interference filtering unit 12 includes a harmonic filtering circuit, a differential mode current filtering circuit, and a first differential mode voltage filtering circuit, where the harmonic filtering circuit is connected to the differential mode current filtering circuit, and the differential mode current filtering circuit is connected to the first differential mode voltage filtering circuit. The harmonic filter circuit comprises a first common-mode capacitor Cy1, the first common-mode capacitor Cy1 is bridged between a positive voltage input end VP and a negative voltage input end VN of the integrated circuit and is connected between a third voltage dependent resistor R3 and the differential mode current filter circuit in parallel, and meanwhile, the first common-mode capacitor Cy1 is grounded. Preferably, in practical applications, the capacitance value of the first common-mode capacitor Cy1 is selected to match the leakage current limit value of the circuit. The first common mode capacitor Cy1 can filter out higher harmonics of the integrated circuit, so that the higher harmonics are prevented from interfering, and the quality of output voltage is improved.
Furthermore, the differential mode current filter circuit is used for filtering the interference of differential mode current, and comprises a first differential mode inductor L1 and a second differential mode inductor L2, wherein the first differential mode inductor L1 is connected in series on a voltage positive input end VP end line of the integrated circuit, one end of the L1 is connected with a first common mode capacitor Cy1, the other end of the L1 is connected with the first differential mode voltage filter circuit, the second differential mode inductor L2 is connected in series on a voltage negative input end VN end line of the integrated circuit, one end of the L2 is connected with the first common mode capacitor Cy1, and the other end of the L2 is connected with the first differential mode voltage filter circuit.
Further, the first differential mode voltage filter circuit comprises a first differential mode capacitor Cx1, a second common mode capacitor Cy2 and a third common mode capacitor Cy3, the first differential mode capacitor Cx1 is bridged between a voltage positive input end VP and a voltage negative input end VN of the integrated circuit, one end of the first differential mode capacitor Cx1 is connected with the first differential mode inductor L1, the other end of the first differential mode capacitor Cx1 is connected with the second differential mode inductor L2, the second common mode capacitor Cy2 is connected in series with the third common mode capacitor Cy3 and then connected in parallel with the first differential mode capacitor Cx1, and the second common mode capacitor Cy2 and the third common mode capacitor Cy3 are both grounded. The first differential mode capacitor Cx1 is used for filtering interference caused by differential mode voltage, the second common mode capacitor Cy2 and the third common mode capacitor Cy3 are common mode capacitors with different capacitance values from the first common mode capacitor Cy1 and are used for being suitable for surge voltage with different frequency waveforms, differential mode voltage interference is filtered, and damage caused by surge voltage possibly generated by an integrated circuit under a complex electromagnetic environment can be reduced.
When the voltage and current applied to the input end line of the integrated circuit exceed the preset values, the primary protection circuit 1 can isolate the overvoltage and the overcurrent and guide the overvoltage and the overcurrent to be grounded, and the boosted current and voltage are quickly responded, so that the surge voltage is quickly released, and the primary protection of the surge current and voltage is realized.
Further, the secondary protection circuit 2 includes a first common mode inductor Lm1 and a second differential mode voltage filter circuit 21, the structure of the second differential mode voltage filter circuit 21 is the same as that of the first differential mode voltage filter circuit, and the second differential mode voltage filter circuit includes a second differential mode capacitor Cx2, a fourth common mode capacitor Cy4 and a fifth common mode capacitor Cy5, the 1 st pin of the first common mode inductor Lm1 is connected with one end of the second common mode capacitor Cy2, the 2 nd pin of the first common mode inductor Lm1 is connected with one end of the second differential mode capacitor Cx2 and one end of the fourth common mode capacitor Cy4, the 3 rd pin of the first common mode inductor Lm1 is connected with one end of the third common mode capacitor Cy3, the 4 th pin of the first common mode inductor Lm1 is connected with the other end of the second differential mode capacitor Cx2 and one end of the fifth common mode capacitor Cy5, the fourth common mode capacitor Cy4 and the fifth common mode capacitor Cy5 are connected in series and then connected in parallel with the second differential mode capacitor Cx2, and the common mode capacitor Cy4 and the fifth common mode capacitor Cy5 are both grounded.
The secondary protection circuit 2 filters interference caused by common-mode current through the first common-mode inductor Lm1, the second differential-mode capacitor Cx2 is bridged between the positive voltage input end VP and the negative voltage input end VN of the integrated circuit to achieve the function of filtering differential-mode voltage interference, and the fourth common-mode capacitor Cy4 and the fifth common-mode capacitor Cy5 are connected in series and bridged between the positive voltage input end VP and the negative voltage input end VN of the integrated circuit to achieve the function of filtering differential-mode voltage interference of the integrated circuit. The secondary protection circuit 2 further releases surge energy, and voltage and current waveforms of the integrated circuit are maintained in a bearable normal range, so that fine protection of surge current and voltage of the integrated circuit is achieved.
Further, the detection circuit 3 includes a detection current limiting circuit 31, the detection current limiting circuit 31 includes a third differential mode inductor L3, a fourth differential mode inductor L4, a sixth common mode capacitor Cy6, a seventh common mode capacitor Cy7 and a third differential mode capacitor Cx3, the third differential mode inductor L3 is connected in series to a voltage positive input terminal VP terminal line of the integrated circuit, one end of the L3 is connected to a 2 nd pin of the first common mode inductor Lm1, the other end of the L3 is connected to one end of the sixth common mode capacitor Cy6, the fourth differential mode inductor L4 is connected in series to a voltage negative input terminal VN terminal line of the integrated circuit, one end of the L4 is connected to a 4 th pin of the first common mode inductor Lm1, the other end of the L4 is connected to one end of the seventh common mode capacitor Cy7, the other end of the sixth common mode capacitor Cy6 is connected to the other end of the seventh common mode capacitor Cy7 and one end of the third differential mode capacitor Cx3, and the other end of the third differential mode capacitor Cx3 is grounded.
The detection circuit 3 further comprises a first contactless switch potentiometer K1, a second contactless switch potentiometer K2 and a signal processor Q1, the first contactless switch potentiometer K1 is connected in series with a voltage positive input end VP end line of the integrated circuit, one end of the K1 is connected with the other end of a third differential mode inductor L3, the other end of the K1 is connected with the signal processor Q1, the second contactless switch potentiometer K2 is connected in series with a voltage negative input end line VN end line of the integrated circuit, one end of the K2 is connected with the other end of a fourth differential mode inductor L4, and the other end of the K2 is connected with the signal processor Q1.
The detection current limiting circuit 31 is used for limiting the current in the detection circuit, ensuring that the first contactless switch K1, the second contactless switch K2 and the signal processor Q1 can work stably, and meanwhile, limiting the influence of the ground wire coupling effect on the integrated circuit, and realizing the functions of detecting the coupling effect in the integrated circuit and resisting. The first contactless switch potentiometer K1 and the second contactless switch potentiometer K2 are both in a closed state under normal conditions, when the voltage passing through a line is not within a preset voltage range, contacts of the first contactless switch potentiometer K1 and the second contactless switch potentiometer K2 are both disconnected, the effect of cutting off a circuit of the first contactless switch potentiometer K1 to protect a primary protection circuit and a secondary protection circuit is achieved, meanwhile, an error signal is transmitted to the signal processor Q1, when the signal processor Q1 receives the error signal, the fact that the primary protection circuit and the secondary protection circuit fail or the integrated circuit cannot be completely protected is shown, and at the moment, the signal processor Q1 sends a prompt signal.
The utility model discloses a primary protection circuit and secondary protection circuit's duplicate protection mode realizes effectively resisting surge voltage, reduces surge voltage to integrated circuit's harm, and guarantee circuit safety effectively monitors and resists through the coupling effect of detection circuitry in to the circuit, reduces the influence of circuit secondary coupling effect to integrated circuit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims (7)

1. An integrated circuit with a detection function is characterized by comprising a primary protection circuit, a secondary protection circuit and a detection circuit, wherein the primary protection circuit is connected with the secondary protection circuit, and the secondary protection circuit is connected with the detection circuit; the primary protection circuit comprises a surge voltage release unit and an interference filtering unit, wherein one side of the surge voltage release unit is connected with a voltage input end of the integrated circuit, and the other side of the surge voltage release unit is connected with the interference filtering unit;
the secondary protection circuit comprises a first common-mode inductor and a second differential-mode voltage filter circuit, the second differential-mode voltage filter circuit comprises a second differential-mode capacitor, a fourth common-mode capacitor and a fifth common-mode capacitor, a 1 st pin of the first common-mode inductor is connected with one end of the second common-mode capacitor, a 2 nd pin of the first common-mode inductor is connected with one end of the second differential-mode capacitor, a 3 rd pin of the first common-mode inductor is connected with one end of the third common-mode capacitor, a 4 th pin of the first common-mode inductor is connected with the other end of the second differential-mode capacitor, the fourth common-mode capacitor is connected with the fifth common-mode capacitor in series and then connected with the second differential-mode capacitor in parallel, and the fourth common-mode capacitor and the fifth common-mode capacitor are both grounded;
the detection circuit comprises a detection current limiting circuit, the detection current limiting circuit comprises a third differential mode inductor, a fourth differential mode inductor, a sixth common mode capacitor, a seventh common mode capacitor and a third differential mode capacitor, one end of the third differential mode inductor is connected with a 2 nd pin of the first common mode inductor, the other end of the third differential mode inductor is connected with one end of the sixth common mode capacitor, one end of the fourth differential mode inductor is connected with a 4 th pin of the first common mode inductor, the other end of the fourth differential mode inductor is connected with one end of the seventh common mode capacitor, the other end of the sixth common mode capacitor is connected with the other end of the seventh common mode capacitor and one end of the third differential mode capacitor, and the other end of the third differential mode capacitor is grounded.
2. The integrated circuit with the detection function according to claim 1, wherein the inrush voltage release unit comprises a first voltage dependent resistor, a second voltage dependent resistor, a third voltage dependent resistor and a gas discharge tube, a first end of the first voltage dependent resistor is connected to a negative voltage input end of the integrated circuit, a first end of the second voltage dependent resistor, a first end of the third voltage dependent resistor and the interference filtering unit, a second end of the first voltage dependent resistor is connected to a second end of the second voltage dependent resistor and one end of the gas discharge tube, the other end of the gas discharge tube is grounded, and a second end of the third voltage dependent resistor is connected to a positive voltage input end of the integrated circuit and the interference filtering unit.
3. The integrated circuit with detection function according to claim 1, wherein the interference filtering unit comprises a harmonic filtering circuit, a differential mode current filtering circuit and a first differential mode voltage filtering circuit, the harmonic filtering circuit is connected with the differential mode current filtering circuit, and the differential mode current filtering circuit is connected with the first differential mode voltage filtering circuit.
4. The integrated circuit with detection function of claim 3, wherein the harmonic filtering circuit comprises a first common mode capacitor, the first common mode capacitor is connected in parallel between the third voltage dependent resistor and the differential mode current filtering circuit, and the first common mode capacitor is further connected to ground.
5. The integrated circuit with detection function of claim 3, wherein the differential mode current filtering circuit comprises a first differential mode inductor and a second differential mode inductor, the first differential mode inductor is connected in series with the voltage positive input line of the integrated circuit, and the second differential mode inductor is connected in series with the voltage negative input line of the integrated circuit.
6. The integrated circuit with detection function of claim 5, wherein the first differential mode voltage filtering circuit comprises a first differential mode capacitor, a second common mode capacitor and a third common mode capacitor, one end of the first differential mode capacitor is connected to the first differential mode inductor, the other end of the first differential mode capacitor is connected to the second differential mode inductor, the second common mode capacitor is connected in series with the third common mode capacitor and then connected in parallel with the first differential mode capacitor, and the second common mode capacitor and the third common mode capacitor are both grounded.
7. The integrated circuit with detection function as claimed in claim 1, wherein the detection circuit further comprises a first contactless switch potentiometer, a second contactless switch potentiometer and a signal processor, one end of the first contactless switch potentiometer is connected with the other end of the third differential mode inductor, the other end of the first contactless switch potentiometer is connected with the signal processor, one end of the second contactless switch potentiometer is connected with the other end of the fourth differential mode inductor, and the other end of the second contactless switch potentiometer is connected with the signal processor.
CN202220955915.8U 2022-04-24 2022-04-24 Integrated circuit with detection function Active CN217692664U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220955915.8U CN217692664U (en) 2022-04-24 2022-04-24 Integrated circuit with detection function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220955915.8U CN217692664U (en) 2022-04-24 2022-04-24 Integrated circuit with detection function

Publications (1)

Publication Number Publication Date
CN217692664U true CN217692664U (en) 2022-10-28

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