CN113608016A - AC115V current conditioning and collecting circuit based on effective value chip - Google Patents
AC115V current conditioning and collecting circuit based on effective value chip Download PDFInfo
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Abstract
The invention relates to an AC115V current conditioning and collecting circuit based on an effective value chip, and belongs to the technical field of aeronautics and electrics. The invention adopts three main devices of a double operational amplifier chip, an effective value chip and an operational amplifier comparator to respectively realize three functions of alternating voltage signal conversion, alternating voltage to direct voltage conversion and voltage threshold judgment. The corresponding relation of alternating current acquisition and calculation is simple, the sampling precision is high, and meanwhile, the voltage threshold value realizes faster overcurrent protection response through hardware; the circuit has strong adaptability and can quickly realize design conversion according to the characteristics of the detected signal. The design process of the circuit meets the forward design requirement of aviation products, the component parameter calculation is simple, the application range is wide, and the circuit is an AC115V current conditioning and collecting circuit with good use value.
Description
Technical Field
The invention belongs to the technical field of aeronautics and electrics, and particularly relates to an AC115V current conditioning and collecting circuit based on an effective value chip.
Background
The airborne equipment has a large number of products (aviation distribution devices) which use AC115V as a working power supply, and an AC115V power driving circuit of the power supply and distribution equipment needs to acquire the working current value of a load channel in real time to realize the health management of the system and can realize quick protection when the load has fault conditions such as overcurrent, short circuit and the like; the current value sampling is realized quickly and accurately, and the basic conditions for realizing the functions are met. The precision and effectiveness of the current conditioning acquisition circuit have important significance for realizing power supply and distribution functions and system safety and reliability. The common alternating current signal acquisition mode comprises a Hall sensor, a power sampling resistor and the like, and the working principle of the alternating current signal acquisition mode is to convert a high-power current signal into a voltage signal with the same frequency.
For an alternating-current voltage signal, the AD sampling needs to firstly convert the alternating-current voltage signal into a direct-current voltage signal, and in order to improve the signal acquisition precision and maximize the signal resolution, the rear-end conditioning acquisition circuit needs to be designed according to the characteristics of the converted voltage signal and convert the voltage signal into a signal in the voltage sampling range of an AD chip.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to realize AC115V current conditioning acquisition circuit that alternating current changes direct current, voltage signal range is tempered and hardware realizes short circuit quick protection function.
(II) technical scheme
In order to solve the technical problem, the invention provides an AC115V current conditioning and collecting circuit based on an effective value chip, which comprises a signal conditioning circuit, an effective value conversion circuit and a load short circuit comparator circuit;
the signal conditioning circuit is used for converting the 0 to +5V alternating voltage signal into a-5V to +5V alternating voltage signal, and the effective value conversion circuit is used for converting the-5V to +5V alternating voltage signal
An effective value of dc voltage; one path of the output effective value direct current voltage enters an external AD chip for analog-to-digital conversion and collection, and the other path of the output effective value direct current voltage enters a load short circuit comparator circuit for threshold calculation and then serves as a reference signal for load short circuit instant protection.
Preferably, the signal conditioning circuit comprises a double operational amplifier chip consisting of a first-stage operational amplifier N1A and a second-stage operational amplifier N1B, a current-limiting resistor R1, a current-limiting resistor R2, a current-limiting resistor R4, a pull-down resistor R3, a pull-down resistor R5 and a filter capacitor C1-C3, wherein the first-stage operational amplifier N1A is used for converting a 0- +5V alternating voltage signal into a-5V- +5V alternating voltage signal, and the second-stage operational amplifier N1B is an emitter follower circuit and is used for increasing the load carrying capacity of an output signal without changing the characteristics of the voltage signal;
in the signal conditioning circuit: a pin 2 of the first-stage operational amplifier N1A is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with 5V reference voltage; a pin 2 of the first-stage operational amplifier N1A is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a pin 1 of the first-stage operational amplifier N1A; a pin 3 of the first-stage operational amplifier N1A is connected with one end of a resistor R3, the pin 3 is an input pin of the output voltage of the Hall sensor, the other end of the R3 is connected with an analog ground, the pin 3 of the first-stage operational amplifier N1A is also connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the analog ground; the first-stage operational amplifier N1A supplies power for +/-15V, 4 pins of the first-stage operational amplifier N1A are connected with-15V, and 8 pins of the first-stage operational amplifier N1A are connected with + 15V;
a pin 1 of the first-stage operational amplifier N1A is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with a pin 5 of the second-stage operational amplifier N1B; the pin 1 of the first-stage operational amplifier N1A is also connected with one end of a resistor R5, and the other end of the resistor R5 is connected with the analog ground; a pin 5 of the second-stage operational amplifier N1B is connected with one end of a capacitor C2, and the other end of the capacitor C2 is connected with the analog ground; the pin 6 of the second-stage operational amplifier N1B is connected with the pin 7 of the second-stage operational amplifier N1B, the pin 7 of the second-stage operational amplifier N1B is connected with one end of the C3, and the other end of the C3 is connected with an analog ground.
Preferably, the effective value conversion circuit comprises an effective value chip N2, resistors R6, R7 and R8, and filter capacitors C4, C5 and C6;
the effective value chip N2 is used for converting-5V- +5V alternating voltage signals
D.c. output voltage U of effective valueADI；
A pin 1 of the effective value chip N2 is connected with one end of the resistor R6, and the other end of the effective value chip N2 is connected with a pin 7 of the second-stage operational amplifier N1B; the 4 feet of the effective value chip N2 are connected with one end of a capacitor C4, and the other end of the capacitor C4 is connected with a +15V power supply; the pin 7 of the effective value chip N2 is in short circuit with the pin 8, the pin 14 of the effective value chip N2 is connected with a +15V power supply, the pin 3 of the effective value chip N2 is connected with a-15V power supply, the pin 9 of the effective value chip N2 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with 15V GND, and the pin 10 of the effective value chip N2 is connected with 15V GND; one end of the capacitor C5 is connected with the other end of the +15V power supply and is connected with 15VGND, and one end of the capacitor C6 is connected with the other end of the-15V power supply and is connected with 15V GND; the pin 6 of the effective value chip N2 is connected with one end of the resistor R8, which is an effective value output pin, and the other end of the resistor R8 is connected with the pin 6 of the operational amplifier comparator N3.
Preferably, the load short-circuit comparator circuit comprises an operational amplifier comparator N3, a resistor R9, a pull-up resistor R10, a current-limiting resistor R11, and voltage-dividing resistors R12 and R13;
a pin 1 of the operational amplifier comparator N3 is connected with one end of a resistor R10, which is an output pin of the operational amplifier comparator N3, and the other end of the resistor R10 is connected with a 3.3V working power supply; the pin 1 of the operational amplifier comparator N3 is also connected with one end of a resistor R11, and the other end of the resistor R11 is connected with the pin 7 of the operational amplifier comparator N3; the pin 7 of the operational amplifier comparator N3 is also connected with one end of a resistor R9, the other end of the resistor R9 is connected with one end of a resistor R13, the other end of the resistor R13 is connected with an analog ground, the connecting end of the resistors R13 and R9 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with a 5V reference voltage source.
Preferably, the short-circuit protection threshold voltage of the operational amplifier comparator N3 is determined by the voltage division value of the resistors R12 and R13.
Preferably, the output signal of the load short-circuit comparator circuit enters an external FPGA logic circuit, and can be logically combined with a control signal output by a CPU to serve as a control signal of an external driving module.
The invention also provides a using method of the circuit.
The invention also provides an application of the circuit in current sampling.
The invention also provides an application of the circuit in realizing short-circuit rapid protection.
The invention also provides an application of the circuit in the technical field of aeronautics and electrics.
(III) advantageous effects
The invention adopts three main devices of a double operational amplifier chip, an effective value chip and an operational amplifier comparator to respectively realize three functions of alternating voltage signal conversion, alternating voltage to direct voltage conversion and voltage threshold judgment. The corresponding relation of alternating current acquisition and calculation is simple, the sampling precision is high, and meanwhile, the voltage threshold value realizes faster overcurrent protection response through hardware; the circuit has strong adaptability and can quickly realize design conversion according to the characteristics of the detected signal. The design process of the circuit meets the forward design requirement of aviation products, the component parameter calculation is simple, the application range is wide, and the circuit is an AC115V current conditioning and collecting circuit with good use value.
Drawings
FIG. 1 is a circuit diagram of a current Hall sensor;
FIG. 2 is a schematic diagram of a signal conditioning circuit in an AC115V current conditioning acquisition circuit applied to a weapon power supply unit in the present invention;
fig. 3 is a schematic diagram of the active value conversion and load short circuit comparator in the AC115V current conditioning acquisition circuit applied to the power supply unit of the weapon.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The invention provides an AC115V current conditioning and collecting circuit based on an effective value chip, which is designed aiming at the sine wave (the median value is 2.5V) of 0- +5V of the output signal of a current Hall sensor in figure 1.
The AC115V current conditioning acquisition circuit mainly comprises a signal conditioning circuit, an effective value conversion circuit and a load short-circuit comparator circuit. The circuit is designed aiming at a 400Hz voltage signal with the same frequency of 0 to +5V output by a current Hall sensor with the sampling range of-100A to 100A, the output voltage value of the sensor linearly corresponds to the sampling current value in real time, and when the sampling current value is 0, the output voltage of the sensor is + 2.5V. The signal conditioning circuit firstly converts the 0 to +5V alternating voltage signal into a-5V to +5V alternating voltage signal through the operational amplifier and then is switched onConversion of signals into over-significant value chips
An effective value of direct current voltage. One path of the effective value chip output enters an AD chip for analog-to-digital conversion and acquisition, and the other path enters an operational amplifier comparator as a load short circuit rapid protection signal. When the load channel has instantaneous heavy current, the control signal of the drive module can be shielded through the logic of the hardware circuit, and the quick protection of the load short circuit is realized.
1) Current Hall sensor circuit
Fig. 1 shows a current hall sensor, the working voltage is 5V, pins 4 and 5 of the chip are respectively a power current input terminal and an output terminal, pin 3 of the chip is an output voltage signal terminal, and the output voltage range is 0 to + 5V.
2) Signal conditioning circuit
Fig. 2 is a schematic design of a signal conditioning circuit in the AC115V current conditioning acquisition circuit;
the signal conditioning circuit comprises a double operational amplifier chip consisting of a first-stage operational amplifier N1A and a second-stage operational amplifier N1B, current-limiting resistors R1, R2 and R4, pull-down resistors R3 and R5 and filter capacitors C1-C3, wherein the first-stage operational amplifier N1A is used for converting 0- +5V alternating-current voltage signals into-5V- +5V alternating-current voltage signals, and the second-stage operational amplifier N1B is an emitter follower circuit and used for increasing the load carrying capacity of output signals without changing the characteristics of the voltage signals.
In the signal conditioning circuit: a pin 2 of the first-stage operational amplifier N1A is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with 5V reference voltage; a pin 2 of the first-stage operational amplifier N1A is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a pin 1 of the first-stage operational amplifier N1A; a pin 3 of the first-stage operational amplifier N1A is connected with one end of a resistor R3, the pin 3 is an input pin of the output voltage of the Hall sensor, the other end of the R3 is connected with an analog ground, the pin 3 of the first-stage operational amplifier N1A is also connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the analog ground; the first-stage operational amplifier N1A supplies power for +/-15V, 4 pins of the first-stage operational amplifier N1A are connected with-15V, and 8 pins of the first-stage operational amplifier N1A are connected with + 15V;
a pin 1 of the first-stage operational amplifier N1A is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with a pin 5 of the second-stage operational amplifier N1B; the pin 1 of the first-stage operational amplifier N1A is also connected with one end of a resistor R5, and the other end of the resistor R5 is connected with the analog ground; a pin 5 of the second-stage operational amplifier N1B is connected with one end of a capacitor C2, and the other end of the capacitor C2 is connected with the analog ground; a pin 6 of the second-stage operational amplifier N1B is connected with a pin 7 of the second-stage operational amplifier N1B, a pin 7 of the second-stage operational amplifier N1B is connected with one end of the C3, and the other end of the C3 is connected with an analog ground;
the voltage conversion relationship is as follows:
(U5V-U2)/R1＝(U2-U1)/R2………(1)；
U2＝UAIC………………………(2)；
wherein U is5VIs a 5V reference voltage, U1 is the voltage value of the pin 1 of the first-stage operational amplifier N1A, U2 is the voltage value of the pin 2 of the first-stage operational amplifier N1A, UAICIs the detected voltage signal output by the Hall sensor.
After calculation, U1＝2UAIC-5; successfully converts the 0 to +5V alternating voltage signal into a-5V to +5V alternating voltage signal.
Fig. 3 is a schematic diagram of the active value conversion and load short circuit comparator design in the AC115V current conditioning acquisition circuit.
3) Effective value conversion circuit
In fig. 2, N2 is the valid value chip, and N3 is the operational amplifier comparator; resistors R6-R9 and R11 are current-limiting resistors, R10 is a pull-up resistor, R12 and R13 are voltage-dividing resistors, and C4-C6 are filter capacitors;
the effective value conversion circuit comprises an effective value chip N2, resistors R6, R7 and R8, and filter capacitors C4, C5 and C6; the effective value chip N2 is used for converting AC voltage signals of-5V- +5V into
D.c. output voltage U of effective valueADIThe output voltage UADICan be collected by an AD chip. One path of the output of the effective value chip N2 enters an AD chip for analog-to-digital conversion and acquisition, and the other path enters an operational amplifier comparator N3 as a load short-circuit rapid protection signal.
A pin 1 of the effective value chip N2 is connected with one end of the resistor R6, and the other end of the effective value chip N2 is connected with a pin 7 of the second-stage operational amplifier N1B in the figure 2; the 4 feet of the effective value chip N2 are connected with one end of a capacitor C4, and the other end of the capacitor C4 is connected with a +15V power supply; the pin 7 of the effective value chip N2 is in short circuit with the pin 8, the pin 14 of the effective value chip N2 is connected with a +15V power supply, the pin 3 of the effective value chip N2 is connected with a-15V power supply, the pin 9 of the effective value chip N2 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with 15V GND, and the pin 10 of the effective value chip N2 is connected with 15V GND; one end of the capacitor C5 is connected with the other end of the +15V power supply and is connected with 15VGND, and one end of the capacitor C6 is connected with the other end of the-15V power supply and is connected with 15V GND; the pin 6 of the effective value chip N2 is connected with one end of the resistor R8, which is an effective value output pin, and the other end of the resistor R8 is connected with the pin 6 of the operational amplifier comparator N3.
4) Load short circuit comparator circuit
The load short-circuit comparator circuit comprises an operational amplifier comparator N3, a resistor R9, a pull-up resistor R10, a current-limiting resistor R11, a voltage-dividing resistor R12 and a voltage-dividing resistor R13;
a pin 1 of the operational amplifier comparator N3 is connected with one end of a resistor R10, which is an output pin of the operational amplifier comparator N3, and the other end of the resistor R10 is connected with a 3.3V working power supply; the pin 1 of the operational amplifier comparator N3 is also connected with one end of a resistor R11, and the other end of the resistor R11 is connected with the pin 7 of the operational amplifier comparator N3; the pin 7 of the operational amplifier comparator N3 is also connected with one end of a resistor R9, the other end of the resistor R9 is connected with one end of a resistor R13, the other end of the resistor R13 is connected with an analog ground, the connecting end of the resistors R13 and R9 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with a 5V reference voltage source; the short-circuit protection threshold voltage of the operational amplifier comparator N3 is determined by the voltage division value of the precision resistors R12 and R13, the output signal of the operational amplifier comparator N3 enters an FPGA logic circuit, and the output signal of the operational amplifier comparator and the output control signal of the CPU are used as the control signal of the driving module after passing through AND logic.
Effective value chip N2 outputs direct current voltage
Proportional ratio and
effective value of current, R13And R12The resistor is based on the overcurrent protection current value IPT62.3A, pressRatio to R12/R13And (3) calculating:
U5VR13/(R12+R13)＝UPT………………………(4)；
the invention converts the 0- +5V alternating voltage signal output by the current Hall sensor into a-5V- +5V alternating voltage signal through a double operational amplifier chip; the converted standard alternating voltage is converted into a direct current voltage signal and a direct current voltage through an effective value chip
Is proportional to
The current value (the effective value of the current corresponds to the peak current sampling range of-100A- +100A of the sensor); one path of the voltage value output by the effective value chip is provided for an AD conversion circuit to carry out digital quantity acquisition, and the other path of the voltage value is input into an operational amplifier comparator to carry out threshold calculation and is used as a reference signal for load short circuit instant heavy current protection. It can be seen that the voltage signal conversion logic of the AC115V current conditioning acquisition circuit is clear, the calculation process of the corresponding relation between the measured physical quantity and the converted voltage is simple, the chip integration level is high, and the required circuit scale is small; the circuit has strong anti-interference capability and high acquisition result precision. The circuit universality is strong, for different signal sources to be collected, only the operational amplifier conditioning circuit needs to be adjusted, and different types of alternating voltages are converted into positive and negative amplitude alternating voltages with the median value of 0V; the short-circuit protection response point can be realized by precise resistor voltage division according to the corresponding relation of the load rapid protection current value.
The acquisition and conditioning of the load current need to be designed according to the characteristics of a measured signal, and the load current acquisition and conditioning circuit relates to an analog signal conversion circuit, an alternating current signal-to-direct current effective value circuit and an operational amplifier comparator circuit, and can realize the functions of converting alternating current into direct current, conditioning the voltage signal range and realizing the short-circuit quick protection of hardware. The current sensor/sampling resistor can be adjusted according to the characteristics of output signals of the current sensor/sampling resistor in specific application.
The circuit is applied to an AC115 driving control circuit of a weapon management unit, and has good acquisition control effect and high reliability. The whole circuit design and calculation process accords with the forward design idea of airborne products, and the method has great popularization value.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An AC115V current conditioning and collecting circuit based on an effective value chip is characterized by comprising a signal conditioning circuit, an effective value conversion circuit and a load short-circuit comparator circuit; the signal conditioning circuit is used for converting the 0 to +5V alternating voltage signal into a-5V to +5V alternating voltage signal, and the effective value conversion circuit is used for converting the-5V to +5V alternating voltage signal
An effective value of dc voltage; one path of the output effective value direct current voltage enters an external AD chip for analog-to-digital conversion and collection, and the other path of the output effective value direct current voltage enters a load short circuit comparator circuit for threshold calculation and then serves as a reference signal for load short circuit instant protection.
2. The circuit as claimed in claim 1, wherein the signal conditioning circuit includes a dual operational amplifier chip composed of a first stage operational amplifier N1A and a second stage operational amplifier N1B, current limiting resistors R1, R2, R4, pull-down resistors R3, R5, and filter capacitors C1-C3, the first stage operational amplifier N1A is used to convert an ac voltage signal of 0V- +5V into an ac voltage signal of-5V- +5V, the second stage operational amplifier N1B is a radio-follower circuit, and is used to increase the loading capacity of the output signal without changing the characteristics of the voltage signal;
in the signal conditioning circuit: a pin 2 of the first-stage operational amplifier N1A is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with 5V reference voltage; a pin 2 of the first-stage operational amplifier N1A is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with a pin 1 of the first-stage operational amplifier N1A; a pin 3 of the first-stage operational amplifier N1A is connected with one end of a resistor R3, the pin 3 is an input pin of the output voltage of the Hall sensor, the other end of the R3 is connected with an analog ground, the pin 3 of the first-stage operational amplifier N1A is also connected with one end of a capacitor C1, and the other end of the capacitor C1 is connected with the analog ground; the first-stage operational amplifier N1A supplies power for +/-15V, 4 pins of the first-stage operational amplifier N1A are connected with-15V, and 8 pins of the first-stage operational amplifier N1A are connected with + 15V;
a pin 1 of the first-stage operational amplifier N1A is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with a pin 5 of the second-stage operational amplifier N1B; the pin 1 of the first-stage operational amplifier N1A is also connected with one end of a resistor R5, and the other end of the resistor R5 is connected with the analog ground; a pin 5 of the second-stage operational amplifier N1B is connected with one end of a capacitor C2, and the other end of the capacitor C2 is connected with the analog ground; the pin 6 of the second-stage operational amplifier N1B is connected with the pin 7 of the second-stage operational amplifier N1B, the pin 7 of the second-stage operational amplifier N1B is connected with one end of the C3, and the other end of the C3 is connected with an analog ground.
3. The circuit of claim 2, wherein the effective value conversion circuit comprises an effective value chip N2, resistors R6, R7, R8, filter capacitors C4, C5, C6;
the effective value chip N2 is used for converting-5V- +5V AC voltage signal into 0E
D.c. output voltage U of effective valueADI；
A pin 1 of the effective value chip N2 is connected with one end of the resistor R6, and the other end of the effective value chip N2 is connected with a pin 7 of the second-stage operational amplifier N1B; the 4 feet of the effective value chip N2 are connected with one end of a capacitor C4, and the other end of the capacitor C4 is connected with a +15V power supply; the pin 7 of the effective value chip N2 is in short circuit with the pin 8, the pin 14 of the effective value chip N2 is connected with a +15V power supply, the pin 3 of the effective value chip N2 is connected with a-15V power supply, the pin 9 of the effective value chip N2 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with 15V GND, and the pin 10 of the effective value chip N2 is connected with 15V GND; one end of the capacitor C5 is connected with the other end of the +15V power supply and is connected with 15VGND, and one end of the capacitor C6 is connected with the other end of the-15V power supply and is connected with 15V GND; the pin 6 of the effective value chip N2 is connected with one end of the resistor R8, which is an effective value output pin, and the other end of the resistor R8 is connected with the pin 6 of the operational amplifier comparator N3.
4. The circuit of claim 3, wherein the load short circuit comparator circuit comprises an operational amplifier comparator N3, a resistor R9, a pull-up resistor R10, a current limiting resistor R11, a voltage dividing resistor R12, R13;
a pin 1 of the operational amplifier comparator N3 is connected with one end of a resistor R10, which is an output pin of the operational amplifier comparator N3, and the other end of the resistor R10 is connected with a 3.3V working power supply; the pin 1 of the operational amplifier comparator N3 is also connected with one end of a resistor R11, and the other end of the resistor R11 is connected with the pin 7 of the operational amplifier comparator N3; the pin 7 of the operational amplifier comparator N3 is also connected with one end of a resistor R9, the other end of the resistor R9 is connected with one end of a resistor R13, the other end of the resistor R13 is connected with an analog ground, the connecting end of the resistors R13 and R9 is connected with one end of a resistor R12, and the other end of the resistor R12 is connected with a 5V reference voltage source.
5. The circuit as claimed in claim 4, wherein the short-circuit protection threshold voltage of the operational amplifier comparator N3 is determined by the voltage division value of the resistors R12, R13.
6. The circuit of claim 4, wherein the output signal of the load short circuit comparator circuit enters an external FPGA logic circuit, and can be logically AND-ed with the control signal output by the CPU to serve as the control signal of the external driving module.
7. Use of a circuit according to any of claims 1 to 6.
8. Use of a circuit according to any of claims 1 to 6 in current sampling.
9. Use of a circuit according to any of claims 1 to 6 for achieving fast short-circuit protection.
10. Use of an electric circuit according to any of claims 1 to 6 in the field of aeronautics and electrics.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023245917A1 (en) * | 2022-06-23 | 2023-12-28 | 宁波中车时代传感技术有限公司 | Overcurrent detection circuit and method suitable for alternating currents |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101692044A (en) * | 2009-10-12 | 2010-04-07 | 浙江大学 | Detection circuit of on-site underwater fluorescent probe |
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| CN209461008U (en) * | 2018-10-17 | 2019-10-01 | 湖南汽车工程职业学院 | A kind of automobile Hall sensor training platform circuit |
| CN110794328A (en) * | 2019-10-30 | 2020-02-14 | 汉中一零一航空电子设备有限公司 | Detection circuit and detection method for detecting overload or short-circuit fault |
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| CN101692044A (en) * | 2009-10-12 | 2010-04-07 | 浙江大学 | Detection circuit of on-site underwater fluorescent probe |
| CN102259233A (en) * | 2011-07-29 | 2011-11-30 | 广州市精源电子设备有限公司 | Intermediate-frequency inverter-resistance spot welding power-supply system |
| CN202737484U (en) * | 2012-08-29 | 2013-02-13 | 华南理工大学 | DSP-based energy-feedback electronic load grid-connected inversion system |
| CN209461008U (en) * | 2018-10-17 | 2019-10-01 | 湖南汽车工程职业学院 | A kind of automobile Hall sensor training platform circuit |
| CN110794328A (en) * | 2019-10-30 | 2020-02-14 | 汉中一零一航空电子设备有限公司 | Detection circuit and detection method for detecting overload or short-circuit fault |
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| WO2023245917A1 (en) * | 2022-06-23 | 2023-12-28 | 宁波中车时代传感技术有限公司 | Overcurrent detection circuit and method suitable for alternating currents |
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