CN210015156U - Current detection circuit, device and electric product - Google Patents
Current detection circuit, device and electric product Download PDFInfo
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- CN210015156U CN210015156U CN201920239218.0U CN201920239218U CN210015156U CN 210015156 U CN210015156 U CN 210015156U CN 201920239218 U CN201920239218 U CN 201920239218U CN 210015156 U CN210015156 U CN 210015156U
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Abstract
The utility model discloses a current detection circuit, device and electric product. The device comprises a current divider, a surge absorption circuit, a low-pass filter circuit, an anti-aliasing filter circuit and an analog-to-digital converter, wherein the current divider is used for acquiring current to be detected and converting the current to be detected into a voltage signal, filtering the acquired voltage signal, converting the voltage signal into a digital signal and sampling the digital signal to obtain the current value of the current to be detected, the temperature detection circuit is arranged to acquire environment temperature information, and the sampling result is compensated according to the acquired environment temperature information to improve the detection precision; the detection condition that makes it accord with float current has solved the storage battery's that exists among the prior art float current difficult detection, and there is current transformer zero return and need have a power failure to reform transform the scheduling problem after the heavy current strikes in the scheme that uses shunt and little current transformer to detect float current, has reached the technological effect that directly utilizes original shunt can detect float current.
Description
Technical Field
The utility model relates to a current detection technical field, in particular to current detection circuit, device and electric product.
Background
At present, a direct current power supply is used as a standby power supply in places such as a transformer substation, a communication base station and a power plant, and as the requirement of a working environment, a storage battery which is a core component of the direct current power supply is continuously connected with a circuit, and the storage battery is always in a floating charge state for a long time, the capacity of the storage battery in the state is gradually reduced along with the increase of time, the leakage current is increased along with the increase of the capacity, and further the floating charge current is increased, so that the battery is heated and overcharged, the aging and overcharging of the storage battery is accelerated, and even more, the thermal runaway of the battery can be caused, so that the.
Most power stations, basic station are unmanned on duty station now, and the storage battery meter that is equipped with can't measure float current, and the technique of current measurement float current mainly uses the shunt to add little current transformer, however this scheme exists that the transformation cost is high, current transformer can return to zero after the heavy current strikes and can't realize transforming the problem of upgrading under the circumstances of not shutting down again.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a current detection circuit, aim at providing a low cost and need not to shut down and utilize original shunt can carry out the current detection circuit that detects to float current.
In order to achieve the above object, the present invention provides a current detection circuit, which includes a current divider, a surge absorption circuit, a low pass filter circuit, an anti-aliasing filter circuit, and an analog-to-digital converter; the current shunt is connected with the surge absorption circuit, the surge absorption circuit is connected with the low-pass filter circuit, the low-pass filter circuit is connected with the anti-aliasing filter circuit, and the anti-aliasing filter circuit is connected with the analog-to-digital converter; wherein the content of the first and second substances,
the current divider is used for converting a current signal to be measured into a first voltage signal;
the surge absorption circuit is used for receiving the first voltage signal converted by the current divider, absorbing surge voltage in the first voltage signal and obtaining a second voltage signal;
the low-pass filter circuit is used for receiving the second voltage signal, filtering the second voltage signal, and filtering a high-frequency signal in the second voltage signal to obtain a low-frequency voltage signal;
the anti-aliasing filter circuit is used for receiving the low-frequency voltage signal and reducing aliasing frequency in the low-frequency voltage signal to obtain a filter voltage signal;
the analog-to-digital converter is used for receiving the filtering voltage signal, performing analog-to-digital conversion on the filtering voltage signal to obtain a digital signal, and obtaining a current value to be measured according to the digital signal and parameters of the current divider.
Preferably, the current detection circuit further comprises a temperature detection circuit and a single chip microcomputer; the single chip microcomputer is connected with the analog-to-digital converter, and the temperature detection circuit is connected with the single chip microcomputer; wherein the content of the first and second substances,
the temperature detection circuit is used for detecting the ambient temperature and generating a temperature signal;
the single chip microcomputer is used for receiving the temperature signal and the current value to be measured sent by the analog-to-digital converter, and compensating the current value to be measured according to the temperature signal to obtain a high-precision current value.
Preferably, the surge absorption circuit comprises a first resistor, a second resistor, a third resistor and a gas discharge tube; wherein the content of the first and second substances,
the first end of the first resistor is connected with the first end of the current divider, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the second end of the current divider, the first end of the gas discharge tube is connected with the first end of the second resistor, the second end of the gas discharge tube is connected with the same potential, the first end of the third resistor is connected with the first end of the first resistor, and the second end of the third resistor is connected with the second end of the second resistor; the first end of the third resistor is connected with the first end of the low-pass filter circuit, and the second end of the third resistor is connected with the second end of the low-pass filter circuit.
Preferably, the low-pass filter circuit includes a first capacitor and a fourth resistor; wherein the content of the first and second substances,
the first end of the first capacitor and the first end of the fourth resistor are connected with the first end of the surge absorption circuit, and the second end of the first capacitor and the second end of the fourth resistor are connected with the second end of the surge absorption circuit; the first end of the fourth resistor is further connected with the first end of the anti-aliasing filter circuit, and the second end of the fourth resistor is further connected with the second end of the anti-aliasing filter circuit.
Preferably, the anti-aliasing filter circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor and a third capacitor; wherein the content of the first and second substances,
the first end of the fifth resistor is connected with the first end of the low-pass filter circuit, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the second end of the low-pass filter circuit, the second end of the sixth resistor is also connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the second end of the third capacitor, the first end of the third capacitor is connected with the second end of the second capacitor, the first end of the second capacitor is connected with the second end of the eighth resistor, the first end of the eighth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is also connected with the second end of the second capacitor, and the second end of the second capacitor is grounded; the first end of the second capacitor is connected with the non-inverting input end of the analog-to-digital converter, and the second end of the third capacitor is connected with the inverting input end of the analog-to-digital converter.
Preferably, the temperature detection circuit comprises a current source circuit, a temperature sensor, a conversion circuit and a filter circuit; the current source circuit is connected with the temperature sensor, the temperature sensor is connected with the conversion circuit, the conversion circuit is connected with the single chip microcomputer, and the filter circuit is connected with the conversion circuit; wherein the content of the first and second substances,
the current source circuit is used for supplying power to the temperature sensor;
the temperature sensor is used for collecting the ambient temperature and outputting a corresponding analog signal;
the filter circuit is used for filtering the analog signal;
the conversion circuit is used for converting the analog signals collected by the temperature sensor into digital signals.
Preferably, the current source circuit includes a ninth resistor, a tenth resistor, a fourth capacitor, a zener diode, and an operational amplifier; wherein the content of the first and second substances,
the first end of the ninth resistor is connected with the input end of a circuit to be detected, the second end of the ninth resistor is connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the output end of the circuit to be detected, the anode of the voltage stabilizing diode is also connected with the second end of the first capacitor, the cathode of the voltage stabilizing diode is also connected with the first end of the fourth capacitor, the second end of the fourth capacitor is also connected with the first end of the tenth resistor, the first end of the fourth capacitor is also connected with the reverse input end of the operational amplifier, the second end of the tenth resistor is also connected with the in-phase input end of the operational amplifier, the second end of the tenth resistor is also connected with the temperature detection circuit, and the output end of the operational amplifier is connected with the temperature detection circuit.
Preferably, the conversion circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a sixth capacitor and a second operational amplifier; wherein the content of the first and second substances,
the first end of the twelfth resistor is connected with the temperature detection circuit, the second end of the twelfth resistor is connected with the reverse input end of the second operational amplifier, the first end of the eleventh resistor is connected with the temperature detection circuit, the second end of the eleventh resistor is connected with the in-phase input end of the second operational amplifier, the output end of the second operational amplifier is connected with the single chip microcomputer, the first end of the thirteenth resistor is connected with the in-phase input end of the second operational amplifier, the second end of the thirteenth resistor is connected with the output end of the second operational amplifier, the second end of the thirteenth resistor is further connected with an analog ground terminal, the first end of the sixth capacitor is connected with the first end of the thirteenth resistor, and the second end of the sixth capacitor is connected with the second end of the thirteenth resistor.
The utility model discloses still provide a current detection device, current detection device includes the current detection circuit.
The utility model discloses still provide an electric product, electric product includes as above current detection device.
The utility model discloses technical scheme forms a current detection circuit through adopting current shunt, surge absorption circuit, low pass filter circuit, anti-aliasing filter circuit and adc. Wherein, the electric current that awaits measuring is gathered to the current shunt, through surge absorption circuit, low pass filter circuit and anti-aliasing filter circuit's filtration, has analog-to-digital converter again and converts and sample it, obtains the sampling result, and be provided with temperature detection circuit, according to the current ambient temperature that temperature detection circuit detected, compensate the sampling result, further improve current detection circuit's detection precision, make it accord with the detection condition of float current, the utility model discloses technical scheme can install under the condition that need not to shut down, has improved the detection precision with lower cost for the float current of battery can detect, has effectively alleviated the ageing and the overcharge phenomenon of battery, has further strengthened the security and the stability of battery, has prolonged the working life when the battery is as stand-by power supply, has reduced use cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of the current detection circuit of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the current detection circuit of the present invention;
fig. 3 is a functional block diagram of another embodiment of the current detection circuit of the present invention;
fig. 4 is a schematic circuit diagram of another embodiment of the current detection circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 100 | Surge absorbing circuit | R1～R14 | First to |
|
| 200 | Low-pass filter circuit | C1～C6 | First to |
|
| 300 | Anti-aliasing filter circuit | | Temperature sensor | |
| 400 | Current source circuit | D1 | |
|
| 500 | Temperature detection circuit | U1、U2 | Operational amplifier, second |
|
| 600 | Filter circuit | GDT | Gas discharge tube GDT | |
| 700 | Switching circuit |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a current detection circuit, which includes a current divider, a surge absorption circuit 100, a low pass filter circuit 200, an anti-aliasing filter circuit 300 and an analog-to-digital converter; the current shunt is connected with the surge absorption circuit 100, the surge absorption circuit 100 is connected with the low-pass filter circuit 200, the low-pass filter circuit 200 is connected with the anti-aliasing filter circuit 300, and the anti-aliasing filter circuit 300 is connected with the analog-to-digital converter; wherein the content of the first and second substances,
the current divider is used for converting a current signal to be measured into a first voltage signal;
the surge absorption circuit 100 is configured to receive the first voltage signal converted by the current splitter, and absorb a surge voltage in the first voltage signal to obtain a second voltage signal;
the low-pass filter circuit 200 is configured to receive the second voltage signal, filter the second voltage signal, and filter a high-frequency signal in the second voltage signal to obtain a low-frequency voltage signal;
the anti-aliasing filter circuit 300 is configured to receive the low-frequency voltage signal, and reduce an aliasing frequency in the low-frequency voltage signal to obtain a filtered voltage signal;
the analog-to-digital converter is used for receiving the filtering voltage signal, performing analog-to-digital conversion on the filtering voltage signal to obtain a digital signal, and obtaining a current value to be measured according to the digital signal and parameters of the current divider.
It should be noted that, in this embodiment, the current divider uses a high-precision resistor with a very small resistance value, and the current value to be measured can be obtained by measuring the voltage at the two ends of the resistor, that is, the current signal to be measured is converted into the voltage to be measured.
It is worth emphasizing that the surge absorption circuit 100, the low pass filter circuit 200 and the anti-aliasing filter circuit 300 are all used for filtering voltage signals, wherein the surge absorption circuit 100 is mainly used for absorbing surge voltage, which is caused by a switching circuit and cannot reflect the magnitude of float current, so that the surge voltage needs to be filtered; the low-pass filter circuit 200 is mainly used for filtering high-frequency signals exceeding a threshold value, and because the scheme is mainly used for detecting floating charge current and the high-frequency signals exceeding the threshold value are caused by interference to a great extent, signals exceeding the range of the floating charge current are filtered; finally, the anti-aliasing filter circuit 300 further filters the aliasing components, and is mainly used for reducing the aliasing frequency components to the extent that the final detection result is not influenced, so that the detection precision is improved.
It is easy to understand that, the analog signal after the filtering step is finally converted into a digital signal by an analog-to-digital converter, and the signal is sampled by the analog-to-digital converter, so as to obtain the current value of the line on which the current divider is installed.
In the present embodiment, a current divider, a surge absorption circuit 100, a low-pass filter circuit 200, an anti-aliasing filter circuit 300, and an analog-to-digital converter are adopted to form a current detection circuit. Wherein, the electric current that awaits measuring is gathered to the current shunt, through surge absorption circuit 100, low pass filter circuit 200 and anti-aliasing filter circuit 300's filtration, has analog to digital converter again and converts and sample it, obtains the sampling result, the utility model discloses technical scheme can install under the condition that need not to shut down, has improved the detection precision with lower cost for the float current of battery can detect, has effectively alleviated ageing and the overcharge phenomenon of battery, has further strengthened the security and the stability of battery, has prolonged the battery and has regarded as the working life when stand-by power supply, has reduced use cost.
As shown in fig. 3, the current detection circuit further includes a temperature detection circuit 500 and a single chip microcomputer; the single chip microcomputer is connected with the analog-to-digital converter, and the temperature detection circuit 500 is connected with the single chip microcomputer; wherein the content of the first and second substances,
the temperature detection circuit 500 is configured to detect an ambient temperature and generate a temperature signal;
the single chip microcomputer is used for receiving the temperature signal and the current value to be measured sent by the analog-to-digital converter, and compensating the current value to be measured according to the temperature signal to obtain a high-precision current value.
It is easy to understand that, since the ambient temperature changes the performance of part of the electronic components, so that the measurement result changes slightly, which reduces the measurement accuracy, the temperature detection circuit 500 is added to detect the ambient temperature to compensate the measurement result, so as to further improve the detection accuracy of the current detection circuit.
The utility model discloses technical scheme forms a current detection circuit through adopting current shunt, abrupt wave absorption circuit 100, low pass filter circuit 200, anti-aliasing filter circuit 300 and adc. Wherein, the current diverter collects the current to be measured, the current is filtered by the surge absorption circuit 100, the low-pass filter circuit 200 and the anti-aliasing filter circuit 300, and is converted and sampled by the analog-to-digital converter to obtain a sampling result, and is provided with a temperature detection circuit 500, according to the current ambient temperature detected by the temperature detection circuit 500, the sampling result is compensated, the detection precision of the current detection circuit is further improved, and the current detection circuit meets the detection condition of the floating charging current, the technical proposal of the utility model can be installed without stopping the machine, the detection precision is improved with lower cost, the floating charging current of the storage battery can be detected, the aging and overcharging phenomena of the storage battery are effectively relieved, the safety and stability of the storage battery are further enhanced, the service life of the storage battery as a standby power supply is prolonged, and the use cost is reduced.
As shown in fig. 2, the surge absorption circuit 100 includes a first resistor R1, a second resistor R2, a third resistor R3, and a gas discharge tube GDT; wherein the content of the first and second substances,
a first end of the first resistor R1 is connected to a first end of the current divider, a second end of the first resistor R1 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is connected to a second end of the current divider, a first end of the gas discharge tube GDT is connected to a first end of the second resistor R2, a second end of the gas discharge tube GDT is connected to an equal potential, a first end of the third resistor R3 is connected to a first end of the first resistor R1, and a second end of the third resistor R3 is connected to a second end of the second resistor R2; the first end of the third resistor R3 is connected to the first end of the low pass filter circuit 200, and the second end of the third resistor R3 is connected to the second end of the low pass filter circuit 200.
It should be noted that, in order to meet the requirement of high-precision measurement, the surge absorption circuit 100 is connected to the current divider by using the above connection method, and a gas discharge tube GDT is installed inside the circuit and connected to an equipotential to protect the surge absorption circuit 100 and prevent the detection result of the product from being influenced and causing erroneous judgment due to the damage of the surge absorption circuit 100 by a high-energy voltage signal.
Specifically, the low pass filter circuit 200 includes a first capacitor C1 and a fourth resistor R4; wherein the content of the first and second substances,
a first end of the first capacitor C1 and a first end of the fourth resistor R4 are connected to a first end of the surge absorption circuit 100, and a second end of the first capacitor C1 and a second end of the fourth resistor R4 are connected to a second end of the surge absorption circuit 100; the first terminal of the fourth resistor R4 is further connected to the first terminal of the anti-aliasing filter circuit 300, and the second terminal of the fourth resistor R4 is further connected to the second terminal of the anti-aliasing filter circuit 300.
It is easy to understand that the low-pass filter circuit 200 is composed of a capacitor and a resistor connected in parallel, and is a simple filter circuit, two ends of which are respectively connected to the surge absorption circuit 100 and the anti-aliasing filter circuit 300, and also plays a role in isolating the surge absorption circuit 100 and the anti-aliasing filter circuit 300, so as to prevent the surge absorption circuit 100 from affecting the anti-aliasing filter circuit 300 during the filtering process.
Specifically, the anti-aliasing filter circuit 300 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2 and a third capacitor C3; wherein the content of the first and second substances,
a first end of the fifth resistor R5 is connected to the first end of the low-pass filter circuit 200, a second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected to the second end of the low-pass filter circuit 200, a second end of the sixth resistor R6 is further connected to the first end of the seventh resistor R7, a second end of the seventh resistor R7 is connected to the second end of the third capacitor C3, a first end of the third capacitor C3 is connected to the second end of the second capacitor C2, a first end of the second capacitor C2 is connected to the second end of the eighth resistor R8, a first end of the eighth resistor R8 is connected to the first end of the fifth resistor R5, a second end of the fifth resistor R5 is further connected to the second end of the second capacitor C2, and a second end of the second capacitor C2 is grounded; the first end of the second capacitor C2 is connected with the non-inverting input end of the analog-to-digital converter, and the second end of the third capacitor C3 is connected with the inverting input end of the analog-to-digital converter.
It should be noted that, because the influence of the ambient temperature on the anti-aliasing filter circuit 300 is relatively large, the accuracy of the anti-aliasing filter circuit is difficult to improve under the conventional circumstances, and the above connection manner is a design made by improving the accuracy of the anti-aliasing filter circuit 300 on the premise of not considering the influence of the temperature change on the anti-aliasing filter circuit 300, and is suitable for the special working environment.
In the present embodiment, a current divider, a surge absorption circuit 100, a low-pass filter circuit 200, an anti-aliasing filter circuit 300, and an analog-to-digital converter are adopted to form a current detection circuit. Wherein, the electric current that awaits measuring is gathered to the current shunt, through surge absorption circuit 100, low pass filter circuit 200 and anti-aliasing filter circuit 300's filtration, has analog to digital converter again and converts and sample it, obtains the sampling result, the utility model discloses technical scheme can install under the condition that need not to shut down, has improved the detection precision with lower cost for the float current of battery can detect, has effectively alleviated ageing and the overcharge phenomenon of battery, has further strengthened the security and the stability of battery, has prolonged the battery and has regarded as the working life when stand-by power supply, has reduced use cost.
As shown in fig. 4, the temperature detection circuit 500 includes a current source circuit 400, a temperature sensor R15, a conversion circuit 700, and a filter circuit; the current source circuit 400 is connected with the temperature sensor R15, the temperature sensor R15 is connected with the conversion circuit 700, the conversion circuit 700 is connected with the single chip microcomputer, and the filter circuit 600 is connected with the conversion circuit 700; wherein the content of the first and second substances,
the current source circuit 400 is used for supplying power to the temperature sensor R15;
the temperature sensor R15 is used for collecting the ambient temperature and outputting a corresponding analog signal;
the filter circuit 600 is configured to filter the analog signal;
the conversion circuit 700 is configured to convert an analog signal collected by the temperature sensor R15 into a digital signal.
It should be noted that, in this embodiment, since the temperature sensor R15 measures the ambient temperature by measuring the resistance of the temperature sensitive resistor, the current source circuit 400 needs to be used to supply power to the temperature sensor R15, and only by ensuring a stable supply current, accurate temperature information can be obtained only by measuring the voltage.
It is easy to understand that, because the required precision is higher, the voltage signal to be measured is filtered by adding the filter circuit, and considering that the temperature does not fluctuate sharply in a very short time, the voltage signal filtered by the filter circuit is an interference voltage to a great extent, and the voltage signal is converted into a digital signal by the conversion circuit 700 after the filtering is finished, so that the subsequent calculation using the temperature data is facilitated.
Specifically, the current source circuit 400 includes a ninth resistor R9, a tenth resistor R10, a fourth capacitor C4, a zener diode D1, and an operational amplifier U1; wherein the content of the first and second substances,
the first end of the ninth resistor R9 is connected with the input end of a circuit to be detected, the second end of the ninth resistor R9 is connected with the negative electrode of the zener diode D1, the positive electrode of the zener diode D1 is connected with the output end of the circuit to be detected, the positive electrode of the zener diode D1 is also connected with the second end of the first capacitor, the negative electrode of the zener diode D1 is also connected with the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is also connected with the first end of the tenth resistor R10, the first end of the fourth capacitor C4 is also connected with the reverse input end of the operational amplifier U1, the second end of the tenth resistor R10 is also connected with the non-inverting input end of the operational amplifier U1, the second end of the tenth resistor R10 is also connected with the temperature detection circuit 500, and the output end of the operational amplifier U1 is connected with the temperature detection circuit 500.
It should be noted that the zener diode D1 functions as a current reference in the present circuit, and the circuit is connected to form a simple reference current source, so that the current magnitude is kept unchanged when the voltage fluctuates, so that the current magnitude is easy to measure.
Specifically, the conversion circuit 700 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a sixth capacitor C6, and a second operational amplifier U2; wherein the content of the first and second substances,
a first end of the twelfth resistor R12 is connected to the temperature detection circuit 500, a second end of the twelfth resistor R12 is connected to the inverting input terminal of the second operational amplifier U2, a first end of the eleventh resistor R11 is connected to the temperature detection circuit 500, a second end of the eleventh resistor R11 is connected to a non-inverting input terminal of the second operational amplifier U2, the output end of the second operational amplifier U2 is connected with the singlechip, the first end of the thirteenth resistor R13 is connected with the non-inverting input end of the second operational amplifier U2, a second end of the thirteenth resistor R13 is connected to the output end of the second operational amplifier U2, the second end of the thirteenth resistor R13 is further connected to an analog ground, the first end of the sixth capacitor C6 is connected to the first end of the thirteenth resistor R13, and the second end of the sixth capacitor C6 is connected to the second end of the thirteenth resistor R13.
It is easy to understand that, because the operational amplifier U1 cannot amplify the current, the current signal needs to be converted into a voltage signal and then the voltage signal needs to be amplified, because of the characteristics of the current source circuit 400, if there is no interference, the converted voltage signal should have a corresponding relationship with the current signal output by the current source, and if the current signal is stable, the voltage signal should be a fixed value, i.e., the voltage signal here is convenient to measure.
In the present embodiment, a current divider, a surge absorption circuit 100, a low-pass filter circuit 200, an anti-aliasing filter circuit 300, and an analog-to-digital converter are adopted to form a current detection circuit. Wherein, the current diverter collects the current to be measured, the current is filtered by the surge absorption circuit 100, the low-pass filter circuit 200 and the anti-aliasing filter circuit 300, and is converted and sampled by the analog-to-digital converter to obtain a sampling result, and is provided with a temperature detection circuit 500, according to the current ambient temperature detected by the temperature detection circuit 500, the sampling result is compensated, the detection precision of the current detection circuit is further improved, and the current detection circuit meets the detection condition of the floating charging current, the technical proposal of the utility model can be installed without stopping the machine, the detection precision is improved with lower cost, the floating charging current of the storage battery can be detected, the aging and overcharging phenomena of the storage battery are effectively relieved, the safety and stability of the storage battery are further enhanced, the service life of the storage battery as a standby power supply is prolonged, and the use cost is reduced.
The utility model discloses still provide a current detection device, this current detection device include as above current detection circuit and the electric current that awaits measuring, this current detection circuit's concrete structure refers to above-mentioned embodiment, because this current detection device has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, no longer gives unnecessary details one by one here. The current to be measured can be the float current of the storage battery pack.
The utility model discloses still provide an electric product, this electric product include as above current detection device, this current detection device's specific structure refers to above-mentioned embodiment, because this electric product has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and no longer the repeated description is given here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A current detection circuit is characterized by comprising a current shunt, a surge absorption circuit, a low-pass filter circuit, an anti-aliasing filter circuit and an analog-to-digital converter; the current shunt is connected with the surge absorption circuit, the surge absorption circuit is connected with the low-pass filter circuit, the low-pass filter circuit is connected with the anti-aliasing filter circuit, and the anti-aliasing filter circuit is connected with the analog-to-digital converter; wherein the content of the first and second substances,
the current divider is used for converting a current signal to be measured into a first voltage signal;
the surge absorption circuit is used for receiving the first voltage signal converted by the current divider, absorbing surge voltage in the first voltage signal and obtaining a second voltage signal;
the low-pass filter circuit is used for receiving the second voltage signal, filtering the second voltage signal, and filtering a high-frequency signal in the second voltage signal to obtain a low-frequency voltage signal;
the anti-aliasing filter circuit is used for receiving the low-frequency voltage signal and reducing aliasing frequency in the low-frequency voltage signal to obtain a filter voltage signal;
the analog-to-digital converter is used for receiving the filtering voltage signal, performing analog-to-digital conversion on the filtering voltage signal to obtain a digital signal, and obtaining a current value to be measured according to the digital signal and parameters of the current divider.
2. The current detection circuit of claim 1, wherein the current detection circuit further comprises a temperature detection circuit and a single chip; the single chip microcomputer is connected with the analog-to-digital converter, and the temperature detection circuit is connected with the single chip microcomputer; wherein the content of the first and second substances,
the temperature detection circuit is used for detecting the ambient temperature and generating a temperature signal;
the single chip microcomputer is used for receiving the temperature signal and the current value to be measured sent by the analog-to-digital converter, and compensating the current value to be measured according to the temperature signal to obtain a high-precision current value.
3. The current sensing circuit of claim 1, wherein the surge absorption circuit comprises a first resistor, a second resistor, a third resistor, and a gas discharge tube; wherein the content of the first and second substances,
the first end of the first resistor is connected with the first end of the current divider, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the second end of the current divider, the first end of the gas discharge tube is connected with the first end of the second resistor, the second end of the gas discharge tube is connected with the same potential, the first end of the third resistor is connected with the first end of the first resistor, and the second end of the third resistor is connected with the second end of the second resistor; the first end of the third resistor is connected with the first end of the low-pass filter circuit, and the second end of the third resistor is connected with the second end of the low-pass filter circuit.
4. The current sensing circuit of claim 1, wherein the low pass filter circuit comprises a first capacitor and a fourth resistor; wherein the content of the first and second substances,
the first end of the first capacitor and the first end of the fourth resistor are connected with the first end of the surge absorption circuit, and the second end of the first capacitor and the second end of the fourth resistor are connected with the second end of the surge absorption circuit; the first end of the fourth resistor is further connected with the first end of the anti-aliasing filter circuit, and the second end of the fourth resistor is further connected with the second end of the anti-aliasing filter circuit.
5. The current sensing circuit of claim 1, wherein the anti-aliasing filter circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, and a third capacitor; wherein the content of the first and second substances,
the first end of the fifth resistor is connected with the first end of the low-pass filter circuit, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the second end of the low-pass filter circuit, the second end of the sixth resistor is also connected with the first end of the seventh resistor, the second end of the seventh resistor is connected with the second end of the third capacitor, the first end of the third capacitor is connected with the second end of the second capacitor, the first end of the second capacitor is connected with the second end of the eighth resistor, the first end of the eighth resistor is connected with the first end of the fifth resistor, the second end of the fifth resistor is also connected with the second end of the second capacitor, and the second end of the second capacitor is grounded; the first end of the second capacitor is connected with the non-inverting input end of the analog-to-digital converter, and the second end of the third capacitor is connected with the inverting input end of the analog-to-digital converter.
6. The current sensing circuit of claim 2, wherein the temperature sensing circuit comprises a current source circuit, a temperature sensor, a conversion circuit, and a filter circuit; the current source circuit is connected with the temperature sensor, the temperature sensor is connected with the conversion circuit, the conversion circuit is connected with the single chip microcomputer, and the filter circuit is connected with the conversion circuit; wherein the content of the first and second substances,
the current source circuit is used for supplying power to the temperature sensor;
the temperature sensor is used for collecting the ambient temperature and outputting a corresponding analog signal;
the filter circuit is used for filtering the analog signal;
the conversion circuit is used for converting the analog signals collected by the temperature sensor into digital signals.
7. The current sense circuit of claim 6, wherein the current source circuit comprises a ninth resistor, a tenth resistor, a fourth capacitor, a zener diode, and an operational amplifier; wherein the content of the first and second substances,
the first end of the ninth resistor is connected with the input end of a circuit to be detected, the second end of the ninth resistor is connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the output end of the circuit to be detected, the anode of the voltage stabilizing diode is also connected with the second end of the first capacitor, the cathode of the voltage stabilizing diode is also connected with the first end of the fourth capacitor, the second end of the fourth capacitor is also connected with the first end of the tenth resistor, the first end of the fourth capacitor is also connected with the reverse input end of the operational amplifier, the second end of the tenth resistor is also connected with the in-phase input end of the operational amplifier, the second end of the tenth resistor is also connected with the temperature detection circuit, and the output end of the operational amplifier is connected with the temperature detection circuit.
8. The current sensing circuit of claim 6, wherein the converting circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a sixth capacitor, and a second operational amplifier; wherein the content of the first and second substances,
the first end of the twelfth resistor is connected with the temperature detection circuit, the second end of the twelfth resistor is connected with the reverse input end of the second operational amplifier, the first end of the eleventh resistor is connected with the temperature detection circuit, the second end of the eleventh resistor is connected with the in-phase input end of the second operational amplifier, the output end of the second operational amplifier is connected with the single chip microcomputer, the first end of the thirteenth resistor is connected with the in-phase input end of the second operational amplifier, the second end of the thirteenth resistor is connected with the output end of the second operational amplifier, the second end of the thirteenth resistor is further connected with an analog ground terminal, the first end of the sixth capacitor is connected with the first end of the thirteenth resistor, and the second end of the sixth capacitor is connected with the second end of the thirteenth resistor.
9. A current sensing device, characterized in that it comprises a current sensing circuit according to any one of claims 1-8.
10. An electric product characterized by comprising the current detection device according to claim 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111721988A (en) * | 2020-06-28 | 2020-09-29 | 珠海普斯雷电子科技有限公司 | Measuring instrument and method for electric quantity compensation of metering device |
| CN112858768A (en) * | 2021-01-07 | 2021-05-28 | 力高(山东)新能源技术有限公司 | Circuit and method for improving current detection precision of current divider |
| CN113447693A (en) * | 2021-05-27 | 2021-09-28 | 蚌埠市双环电子集团股份有限公司 | Current detection splitter for new energy automobile battery management system |
| CN116165420A (en) * | 2023-04-20 | 2023-05-26 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111721988A (en) * | 2020-06-28 | 2020-09-29 | 珠海普斯雷电子科技有限公司 | Measuring instrument and method for electric quantity compensation of metering device |
| CN111721988B (en) * | 2020-06-28 | 2024-05-14 | 珠海普斯雷电子科技有限公司 | Measuring device electricity quantity compensation measuring and calculating instrument and method |
| CN112858768A (en) * | 2021-01-07 | 2021-05-28 | 力高(山东)新能源技术有限公司 | Circuit and method for improving current detection precision of current divider |
| CN112858768B (en) * | 2021-01-07 | 2022-12-16 | 力高(山东)新能源技术股份有限公司 | Circuit and method for improving current detection precision of current divider |
| CN113447693A (en) * | 2021-05-27 | 2021-09-28 | 蚌埠市双环电子集团股份有限公司 | Current detection splitter for new energy automobile battery management system |
| CN113447693B (en) * | 2021-05-27 | 2022-03-29 | 蚌埠市双环电子集团股份有限公司 | Current detection splitter for new energy automobile battery management system |
| CN116165420A (en) * | 2023-04-20 | 2023-05-26 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
| CN116165420B (en) * | 2023-04-20 | 2023-10-03 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
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