CN211785744U - High-side current detection device and system - Google Patents
High-side current detection device and system Download PDFInfo
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- CN211785744U CN211785744U CN201922375397.3U CN201922375397U CN211785744U CN 211785744 U CN211785744 U CN 211785744U CN 201922375397 U CN201922375397 U CN 201922375397U CN 211785744 U CN211785744 U CN 211785744U
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Abstract
The application provides a high limit current detection device and system includes: the device comprises a sampling circuit, an isolation amplifier, a filtering and amplifying circuit and an analog-to-digital conversion circuit. The first end of the sampling circuit is used for electrically connecting with a power supply. And the second end of the sampling circuit is used for electrically connecting a load. The isolation amplifier is connected in parallel with two ends of the sampling circuit. The isolation amplifier is used for detecting voltage drops at two ends of the sampling circuit to obtain a first detection voltage. The input end of the filtering amplification circuit is electrically connected with the output end of the isolation amplifier. The filter amplifying circuit is used for acquiring a first detection voltage and carrying out filter amplification processing on the first detection voltage to obtain a second detection voltage. The input end of the analog-to-digital conversion circuit is electrically connected with the output end of the filtering amplification circuit. The output end of the analog-to-digital conversion circuit is used for being electrically connected with an upper computer. The analog-to-digital conversion circuit is used for converting the second detection voltage from an analog signal to a digital signal and sending the digital signal to the upper computer so as to determine the current value of the load.
Description
Technical Field
The present application relates to the field of load current detection technologies, and in particular, to a high-side current detection apparatus and system.
Background
At present, a small current is detected in a high-voltage environment, a sampling resistor is connected in series on a high-voltage detected line, and two voltage dividing resistors are respectively added between two ends of the sampling resistor and the ground and used for detecting voltages at two ends of the sampling resistor. Meanwhile, a differential amplifier is connected to obtain the voltage on the sampling resistor so as to calculate the current on the sampling resistor.
However, in actual measurement, since the voltage on the line to be measured is 5000V, the voltage dividing ratio of the two voltage dividing resistors is large, and the voltage dividing resistors cannot achieve the required accuracy. Meanwhile, the current on the line to be measured is very small, so that the voltage on the sampling resistor cannot be accurately measured, and the problem of poor measurement reliability exists.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a high-side current detection device and system for solving the problem that the existing detection device cannot accurately measure the voltage on the sampling resistor and has poor measurement reliability.
A high side current detection device comprising:
the first end of the sampling circuit is electrically connected with a power supply, and the second end of the sampling circuit is electrically connected with a load;
the first input end of the isolation amplifier is electrically connected with the first end of the sampling circuit, and the second input end of the isolation amplifier is electrically connected with the second end of the sampling circuit, so that voltage drops at two ends of the sampling circuit are detected, and a first detection voltage is obtained;
the input end of the filtering amplification circuit is electrically connected with the output end of the isolation amplifier and is used for filtering and amplifying the first detection voltage to obtain a second detection voltage; and
the input end of the analog-to-digital conversion circuit is electrically connected with the output end of the filtering amplification circuit, and the output end of the analog-to-digital conversion circuit is used for being electrically connected with an upper computer and used for converting the second detection voltage from an analog signal into a digital signal and sending the digital signal to the upper computer so as to determine the current value of the load.
In one embodiment, the common terminal of the isolation amplifier is electrically connected to the second terminal of the sampling circuit.
In one embodiment, the sampling circuit comprises:
the first end of the sampling resistor is electrically connected with the power supply, the second end of the sampling resistor is electrically connected with the load, and the isolation amplifier is connected in parallel with the two ends of the sampling resistor.
In one embodiment, the filter amplifier circuit includes:
the input end of the low-pass filter circuit is electrically connected with the output end of the isolation amplifier and is used for filtering the first detection voltage to obtain a filtering voltage; and
and the input end of the amplification processing circuit is electrically connected with the output end of the low-pass filter circuit, and the output end of the amplification processing circuit is electrically connected with the analog-to-digital conversion circuit and used for amplifying the filter voltage to obtain the second detection voltage and sending the second detection voltage to the analog-to-digital conversion circuit.
In one embodiment, the low pass filter circuit includes:
a first end of the first resistor is electrically connected with the output end of the isolation amplifier, and a second end of the first resistor is electrically connected with the input end of the amplification processing circuit; and
and the first end of the first capacitor is respectively and electrically connected with the second end of the first resistor and the input end of the amplification processing circuit, and the second end of the first capacitor is grounded.
In one embodiment, the amplification processing circuit includes:
a first operational amplifier, a first input end of which is electrically connected with an output end of the low-pass filter circuit, and an output end of which is electrically connected with the analog-to-digital conversion circuit;
a first end of the second resistor is electrically connected with the second input end of the first operational amplifier, and a second end of the second resistor is grounded;
a first end of the third resistor is electrically connected with the first end of the second resistor, and a second end of the third resistor is electrically connected with the output end of the first operational amplifier; and
and the second capacitor is connected in parallel with two ends of the third resistor.
In one embodiment, the high-side current detection device further includes:
and the voltage follower circuit is connected between the filtering amplification circuit and the analog-to-digital conversion circuit in series and used for outputting the second detection voltage to the analog-to-digital conversion circuit after performing phase compensation on the second detection voltage.
In one embodiment, the voltage follower circuit comprises:
a first input end of the second operational amplifier is electrically connected with an output end of the filtering amplification circuit, and an output end of the second operational amplifier is electrically connected with the analog-to-digital conversion circuit;
a first end of the fourth resistor is electrically connected with the second input end of the second operational amplifier, and a second end of the fourth resistor is electrically connected with the output end of the second operational amplifier; and
and the third capacitor is connected in parallel with two ends of the fourth resistor.
In one embodiment, the power supply provides a supply voltage greater than 1000V.
A high-side current detection system is applied to a plurality of paths of loads and comprises the high-side current detection device in any embodiment, first ends of a plurality of sampling circuits are used for being electrically connected with a power supply, and a second end of each sampling circuit is electrically connected with one load; and
and the upper computer is electrically connected with the output ends of the analog-to-digital conversion circuits and is used for acquiring a plurality of digital voltage values corresponding to the second detection voltages so as to determine the current value of each load.
In one embodiment, the power supply provides a supply voltage greater than 1000V.
Compared with the prior art, the high-side current detection device and the high-side current detection system detect the voltage drop at two ends of the sampling circuit through the isolation amplifier, are matched with the filtering amplification circuit and the analog-to-digital conversion circuit, sequentially filter, amplify and convert the acquired first detection voltage to obtain a corresponding digital voltage signal, and send the digital voltage signal to the upper computer, so that the current value of the load is determined; meanwhile, the isolation amplifier isolates the power supply voltage provided by the power supply at the input side of the isolation amplifier, so that the interference of the power supply voltage on the filtering amplification circuit and the analog-to-digital conversion circuit can be effectively reduced, the performance index of a detection link is improved, and the reliability and the stability of the detection link can be effectively improved.
Drawings
Fig. 1 is a schematic circuit diagram of a high-side current detection apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a high-side current detection device according to an embodiment of the present disclosure;
FIG. 3 is a circuit diagram of a filter amplifier circuit and a voltage follower circuit according to an embodiment of the present disclosure;
fig. 4 is a circuit diagram of a high-side current detection system according to an embodiment of the present disclosure.
10 high-side current detection device
100 sampling circuit
101 power supply
102 load
110 sampling resistor
20 high-side current detection system
21 upper computer
200 isolation amplifier
300 filtering amplifying circuit
310 low-pass filter circuit
311 first resistance
312 first capacitance
320 amplifying processing circuit
321 first operational amplifier
322 second resistance
323 third resistor
324 second capacitance
400 analog-to-digital conversion circuit
500 voltage follower circuit
510 second operational amplifier
520 fourth resistor
530 third capacitor
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a high-side current detection apparatus 10, including: the circuit comprises a sampling circuit 100, an isolation amplifier 200, a filtering and amplifying circuit 300 and an analog-to-digital conversion circuit 400. The first end of the sampling circuit 100 is electrically connected to a power source 101, and the second end of the sampling circuit 100 is electrically connected to a load 102. A first input terminal of the isolation amplifier 200 is electrically connected to a first terminal of the sampling circuit 100. A second input terminal of the isolation amplifier 200 is electrically connected to a second terminal of the sampling circuit 100. The isolation amplifier 200 is used to detect a voltage drop across the sampling circuit 100 to obtain a first detection voltage. The input end of the filtering and amplifying circuit 300 is electrically connected with the output end of the isolation amplifier 200.
The filtering and amplifying circuit 300 is configured to perform filtering and amplifying processing on the first detection voltage to obtain a second detection voltage. The analog-to-digital conversion circuit 400 is electrically connected to the output terminal of the filtering and amplifying circuit 300. The output end of the analog-to-digital conversion circuit 400 is used for being electrically connected with an upper computer 21. The analog-to-digital conversion circuit 400 is configured to convert the second detection voltage from an analog signal to a digital signal and send the digital signal to the upper computer 21, so as to determine a current value of the load 102.
In one embodiment, the specific structure of the sampling circuit 100 is not limited as long as the sampling circuit has the function of collecting the current of the load 102 during operation. In one embodiment, the sampling circuit 100 may be comprised of a low temperature drift resistor. Specifically, the low temperature drift resistance can be selected to be a precise low temperature drift resistance of 10K Ω. In one embodiment, the power supply 101 provides a high voltage supply. I.e. the supply voltage is a voltage larger than 1000V.
In one embodiment, the load 102 may be a load on a medical device. For example, the load 102 is an ion pump that evacuates an acceleration tube in a radiotherapy apparatus. The rated working voltage of the ion pump can be 3.3KV, the maximum working voltage can be as high as 5KV, and the working current is as small as microampere. At this time, the sampling circuit 100 is formed by selecting a precise low-temperature drift resistor, so that the sampling voltage can be precisely detected, and the current of the load 102 during operation can be determined.
In one embodiment, the load 102 may be a multi-path load (as shown in fig. 2), and the current of a plurality of the loads 102 operating simultaneously may be detected by a plurality of the high-side current detection devices 10. I.e. one of the high side current detection means 10 detects the current when one of the loads 102 is operating. That is, there is a one-to-one correspondence between the high-side current detection device 10 and the load 102. Meanwhile, it is required to ensure that the first end of each sampling circuit 100 is electrically connected to the power supply 101, and the second end of each sampling circuit 100 is electrically connected to the high-voltage end of each load 102. By means of the high-side detection mode, the current of multiple paths of the loads 102 can be respectively collected.
In one embodiment, the isolation amplifier 200 is used to detect a voltage drop across the sampling circuit 100 and obtain the first detection voltage. The first detection voltage is the sampling voltage. In one embodiment, the isolation amplifier 200 is further configured to isolate the supply voltage provided by the power supply 101 from the filtering and amplifying circuit 300. That is, the isolation amplifier 200 can isolate the supply voltage (high voltage) at the high voltage side of the isolation amplifier 200 (i.e., the input side of the isolation amplifier 200), and can effectively reduce the interference of the high voltage (i.e., the supply voltage) on the filtering and amplifying circuit and the analog-to-digital conversion circuit, thereby improving the performance index of the detection link (i.e., the filtering and amplifying circuit and the analog-to-digital conversion circuit).
In one embodiment, the isolation amplifier 200 may employ an isolation amplifier with an isolation voltage of 5KV, an isolation voltage peak of 7KV, a temperature drift as low as 15 μ V/deg.c, a suitable gain of 1, and a bandwidth of 275 KHz. The isolation amplifier can quickly respond to the change of the current, namely, the voltage drop at two ends of the sampling circuit 100 can be quickly detected, and a first detection voltage is obtained.
In one embodiment, the high voltage side of the isolation amplifier 200 may be powered by an isolation power supply (HVSS +, HVSS-) and the low voltage side (i.e., the output side of the isolation amplifier 200) may be powered by a common low voltage power supply (VCC). The isolation power supply is a high-voltage power supply (namely, the output power supply voltage is greater than 1000V). In one embodiment, the input terminal of the isolation power supply is a common low-voltage power supply, and the output terminal of the isolation power supply is HVSS +, HVSS-. In one embodiment, the isolated power supply is optionalThe high-voltage isolation power supply with the insulation voltage of 6KV has the efficiency of 82 percent and the energy density of up to 0.44W/cm3And 5V, 9V, 12V and 15V output are supported.
In one embodiment, the common terminal of the isolation amplifier 200 is electrically connected to the second terminal of the sampling circuit 100 (i.e., the low voltage side of the sampling circuit 100), such that the common terminal of the isolation amplifier 200 is at the same level as the low voltage side of the sampling circuit 100, and the HVSS + and HVSS "are correspondingly pulled up, such that the output voltage of the high voltage isolation power supply (i.e., HVSS +, HVSS-) reaches the level of the ion pump power supply voltage. The isolation amplifier 200 can prevent the high-voltage side and the low-voltage side from interfering with each other, and can effectively reduce the interference of high voltage on the filtering amplification circuit and the analog-to-digital conversion circuit, thereby improving the performance index of the detection link and further improving the reliability and stability of the detection link.
It is understood that the specific structure of the filtering and amplifying circuit 300 is not particularly limited as long as the filtering and amplifying circuit has the function of acquiring the first detection voltage and performing filtering and amplifying processing on the first detection voltage. In one embodiment, the filter amplifier circuit 300 may include a passive filter and a non-inverting amplifier. And filtering the first detection voltage by using a passive filter, and amplifying the filtered first detection voltage by using the in-phase amplifier, so that the second detection voltage can be obtained.
It is to be understood that the specific circuit structure of the analog-to-digital conversion circuit 400 is not limited as long as the function of acquiring the second detection voltage and converting the second detection voltage from an analog signal to a digital signal is provided. In one embodiment, the analog-to-digital conversion circuit 400 may be formed of a conventional chip with analog-to-digital conversion. In one embodiment, the analog-to-digital conversion circuit 400 may also be formed of a high-precision analog-to-digital converter.
In one embodiment, the isolation amplifier 200 and the filtering and amplifying circuit 300 process analog voltage signals. After the analog-to-digital conversion circuit 400 converts the second detection voltage from an analog signal to a digital signal, the upper computer 21 receives the digital signal. Namely, the upper computer 21 processes the digital signal. The analog-to-digital conversion circuit 400 converts the second detection voltage from an analog signal to a digital signal, and sends the converted second detection voltage to the upper computer 21, so that the upper computer 21 determines a digital value (i.e., a current value) of the weak current of the load 102 based on the second detection voltage and the resistance value of the sampling circuit 100, and further, the current detection of the load 102 is realized.
In this embodiment, the voltage drop across the sampling circuit 100 is detected by the isolation amplifier 200, and the voltage drop is matched with the filtering and amplifying circuit 300 and the analog-to-digital conversion circuit 400, so that the acquired first detection voltage is sequentially filtered, amplified and analog-to-digital converted to obtain a corresponding digital voltage signal, and the digital voltage signal is sent to the upper computer 21, thereby determining the current value of the load 102. Meanwhile, the isolation amplifier 200 isolates the power supply voltage provided by the power supply 101 at the input side of the isolation amplifier 200, so that the interference of the power supply voltage on the filtering amplification circuit 300 and the analog-to-digital conversion circuit 400 can be effectively reduced, the performance index of a detection link is improved, and the reliability and the stability of the detection link can be effectively improved.
In one embodiment, the sampling circuit 100 includes: the resistor 110 is sampled. A first terminal of the sampling resistor 110 is electrically connected to the power supply 101. A second terminal of the sampling resistor 110 is electrically connected to the load 102. The isolation amplifier 200 is connected in parallel to both ends of the sampling resistor 110. In one embodiment, the isolation amplifier 200 is connected in parallel across the sampling resistor 110, which means: a first input terminal of the isolation amplifier 200 is electrically connected to a first terminal of the sampling resistor 110, and a second input terminal of the isolation amplifier 200 is electrically connected to a second terminal of the sampling resistor 110. In one embodiment, the sampling resistor 110 may be a precision low temperature drift resistor of 10K Ω.
In one embodiment, the filtering and amplifying circuit 300 includes: a low-pass filter circuit 310 and an amplification processing circuit 320. The input terminal of the low pass filter circuit 310 is electrically connected to the output terminal of the isolation amplifier 200. The low-pass filter circuit 310 is configured to filter the first detection voltage to obtain a filtered voltage. The input terminal of the amplification processing circuit 320 is electrically connected to the output terminal of the low-pass filter circuit 310. The output end of the amplification processing circuit 320 is electrically connected to the analog-to-digital conversion circuit 400. The amplification processing circuit 320 is configured to amplify the filtered voltage to obtain the second detection voltage, and send the second detection voltage to the analog-to-digital conversion circuit 400.
Referring to fig. 3, in an embodiment, a specific circuit structure of the low-pass filter circuit 310 is not limited as long as it has a filtering function. In one embodiment, the low pass filter circuit 310 may be comprised of a low pass filter. In one embodiment, the low pass filter circuit 310 may also be formed by an RC circuit. Specifically, the RC circuit may include a first resistor 311 and a first capacitor 312. A first terminal of the first resistor 311 is electrically connected to the output terminal of the isolation amplifier 200.
A second end of the first resistor 311 is electrically connected to an input end of the amplification processing circuit 320. A first end of the first capacitor 312 is electrically connected to a second end of the first resistor 311 and an input end of the amplification processing circuit 320, respectively. A second terminal of the first capacitor 312 is connected to ground. The low-pass filter circuit 310 formed by the first resistor 311 and the first capacitor 312 is used to filter the first detection voltage to obtain a filtered voltage, so as to eliminate high-frequency interference.
It is understood that the specific circuit structure of the amplification processing circuit 320 is not limited as long as the function of acquiring the filtered voltage and performing amplification processing on the filtered voltage is provided. In one embodiment, the amplifying circuit 320 may be composed of an operational amplifier with a capacitor, a resistor, and the like. Specifically, the amplification processing circuit 320 may include: a first operational amplifier 321, a second resistor 322, a third resistor 323 and a second capacitor 324. A first input terminal of the first operational amplifier 321 is electrically connected to an output terminal of the low pass filter circuit 310.
The output terminal of the first operational amplifier 321 is electrically connected to the analog-to-digital conversion circuit 400. A first end of the second resistor 322 is electrically connected to a second input end of the first operational amplifier 321. A second terminal of the second resistor 322 is connected to ground. A first terminal of the third resistor 323 is electrically connected to a first terminal of the second resistor 322. A second terminal of the third resistor 323 is electrically connected to the output terminal of the first operational amplifier 321. The second capacitor 324 is connected in parallel to two ends of the third resistor 323.
In one embodiment, the first operational amplifier 321 may be a high-precision, low-noise operational amplifier. In one embodiment, the third resistor 323 and the second capacitor 324 form a negative feedback loop of the first operational amplifier 321. The phase of the second detection voltage signal output from the output terminal of the first operational amplifier 321 can be adjusted by the second capacitor 324, so as to increase the stability margin.
In one embodiment, the high-side current detection apparatus 10 further includes: the voltage follower circuit 500. The voltage follower circuit 500 is connected in series between the filter amplifier circuit 300 and the analog-to-digital conversion circuit 400. The voltage follower circuit 500 is configured to obtain the second detection voltage, perform phase compensation on the second detection voltage, and output the second detection voltage to the analog-to-digital conversion circuit 400.
In an embodiment, the specific circuit structure of the voltage follower circuit 500 is not limited as long as the voltage follower circuit has the functions of acquiring the second detection voltage, performing phase compensation on the second detection voltage, and outputting the second detection voltage to the analog-to-digital conversion circuit 400. In one embodiment, the voltage follower circuit 500 may include a second operational amplifier 510, a fourth resistor 520, and a third capacitor 530. A first input terminal of the second operational amplifier 510 is electrically connected to an output terminal of the filtering and amplifying circuit 300.
The output terminal of the second operational amplifier 510 is electrically connected to the analog-to-digital conversion circuit 400. A first terminal of the fourth resistor 520 is electrically connected to a second input terminal of the second operational amplifier 510. A second terminal of the fourth resistor 520 is electrically connected to an output terminal of the second operational amplifier 510. The third capacitor 530 is connected in parallel to two ends of the fourth resistor 520.
In one embodiment, the second operational amplifier 510 may be a high-precision, low-noise operational amplifier. In one embodiment, the acquired second detection voltage is phase compensated by the fourth resistor 520 and the third capacitor 530, so as to improve the stability of the signal.
Referring to fig. 4, an embodiment of the present application provides a high-side current detection system 20 applied to a multi-path load 102. The high-side current detection system 20 includes a plurality of high-side current detection devices 10 according to any one of the above embodiments and an upper computer 21. The first terminals of the plurality of sampling circuits 100 are all used for electrically connecting the power supply 101. The second terminal of each of the sampling circuits 100 is electrically connected to one of the loads 102. The upper computer 21 is electrically connected with the output ends of the analog-to-digital conversion circuits 400. The upper computer 21 is configured to obtain a plurality of digital voltage values corresponding to the second detection voltages, so as to determine a current value of each path of the load 102. In one embodiment, the power supply 101 provides a supply voltage greater than 1000V.
In one embodiment, when the load 102 is an ion pump, multiple ion pumps can be simultaneously detected by the high side current detection system 20. That is, the plurality of high-side current detection devices 10 detect the plurality of ion pumps, respectively. That is, one of the high-side current detection devices 10 detects one of the ion pumps. The detection of multiple paths of the load 102 can be realized by matching a plurality of high-side current detection devices 10.
In one embodiment, after the detection of the plurality of high-side current detection devices 10 is completed, a plurality of digital voltage values obtained by performing analog-to-digital conversion on the obtained plurality of second detection voltages are sent to the upper computer 21. The current value of each load 102 is further determined by the upper computer 21. Multiple paths of the load 102 can be simultaneously current sensed by the high-side current sensing system 20.
To sum up, this application passes through isolation amplifier 200 detects the voltage drop at sampling circuit 100 both ends, and with filtering amplification circuit 300 with analog-to-digital conversion circuit 400 cooperation will gather first detection voltage obtains corresponding digital voltage signal after filtering, enlarging, analog-to-digital conversion in proper order, and send to host computer 21, thereby confirm load 102's current value realizes right on the high limit load 102 carries out current detection. Meanwhile, the isolation amplifier 200 isolates the power supply voltage provided by the power supply 101 at the input side of the isolation amplifier 200, so that the interference of the power supply voltage on the filtering amplification circuit 300 and the analog-to-digital conversion circuit 400 can be effectively reduced, the performance index of a detection link is improved, and the reliability and the stability of the detection link can be effectively improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A high side current detection device, comprising:
a sampling circuit (100), wherein a first end of the sampling circuit (100) is electrically connected with a power supply (101), and a second end of the sampling circuit (100) is electrically connected with a load (102);
the first input end of the isolation amplifier (200) is electrically connected with the first end of the sampling circuit (100), and the second input end of the isolation amplifier (200) is electrically connected with the second end of the sampling circuit (100) and used for detecting the voltage drop at the two ends of the sampling circuit (100) to obtain a first detection voltage;
the input end of the filtering and amplifying circuit (300) is electrically connected with the output end of the isolation amplifier (200) and is used for filtering and amplifying the first detection voltage to obtain a second detection voltage; and
the input end of the analog-to-digital conversion circuit (400) is electrically connected with the output end of the filtering amplification circuit (300), and the output end of the analog-to-digital conversion circuit (400) is electrically connected with an upper computer (21) and used for converting the second detection voltage into a digital signal from an analog signal and sending the digital signal to the upper computer (21) so as to determine the current value of the load (102).
2. The high side current detection device according to claim 1, wherein the common terminal of the isolation amplifier (200) is electrically connected to the second terminal of the sampling circuit (100).
3. The high-side current detection apparatus according to claim 1, wherein the sampling circuit (100) comprises:
the first end of the sampling resistor (110) is electrically connected with the power supply (101), the second end of the sampling resistor (110) is electrically connected with the load (102), and the isolation amplifier (200) is connected in parallel with two ends of the sampling resistor (110).
4. The high-side current detection apparatus according to claim 1, wherein the filter amplification circuit (300) comprises:
the input end of the low-pass filter circuit (310) is electrically connected with the output end of the isolation amplifier (200) and is used for filtering the first detection voltage to obtain a filtered voltage; and
the input end of the amplification processing circuit (320) is electrically connected with the output end of the low-pass filter circuit (310), the output end of the amplification processing circuit (320) is electrically connected with the analog-to-digital conversion circuit (400) and used for amplifying the filter voltage to obtain the second detection voltage and sending the second detection voltage to the analog-to-digital conversion circuit (400).
5. The high-side current detection device according to claim 4, wherein the low-pass filter circuit (310) comprises:
a first resistor (311), wherein a first end of the first resistor (311) is electrically connected with the output end of the isolation amplifier (200), and a second end of the first resistor (311) is electrically connected with the input end of the amplification processing circuit (320); and
a first capacitor (312), wherein a first end of the first capacitor (312) is electrically connected to the second end of the first resistor (311) and the input end of the amplification processing circuit (320), respectively, and a second end of the first capacitor (312) is grounded.
6. The high-side current detection device according to claim 4, wherein the amplification processing circuit (320) includes:
a first operational amplifier (321), a first input end of the first operational amplifier (321) is electrically connected with an output end of the low-pass filter circuit (310), and an output end of the first operational amplifier (321) is electrically connected with the analog-to-digital conversion circuit (400);
a second resistor (322), a first end of the second resistor (322) is electrically connected with a second input end of the first operational amplifier (321), and a second end of the second resistor (322) is grounded;
a third resistor (323), a first end of the third resistor (323) being electrically connected to a first end of the second resistor (322), a second end of the third resistor (323) being electrically connected to an output of the first operational amplifier (321); and
and the second capacitor (324) is connected in parallel with two ends of the third resistor (323).
7. The high-side current detection device according to claim 1, further comprising:
the voltage follower circuit (500), the voltage follower circuit (500) is connected in series between the filtering and amplifying circuit (300) and the analog-to-digital conversion circuit (400), and is used for outputting the second detection voltage to the analog-to-digital conversion circuit (400) after performing phase compensation.
8. The high-side current detection device according to claim 7, wherein the voltage follower circuit (500) comprises:
a second operational amplifier (510), wherein a first input end of the second operational amplifier (510) is electrically connected with an output end of the filtering amplification circuit (300), and an output end of the second operational amplifier (510) is electrically connected with the analog-to-digital conversion circuit (400);
a fourth resistor (520), a first end of the fourth resistor (520) being electrically connected to the second input terminal of the second operational amplifier (510), a second end of the fourth resistor (520) being electrically connected to the output terminal of the second operational amplifier (510); and
and the third capacitor (530) is connected in parallel with two ends of the fourth resistor (520).
9. The high side current detection device according to any of claims 1-8, wherein the power supply (101) provides a supply voltage of more than 1000V.
10. A high side current detection system applied to multiple loads (102), comprising a plurality of high side current detection devices (10) according to any one of claims 1 to 8, wherein a first end of each of the plurality of sampling circuits (100) is electrically connected to the power supply (101), and a second end of each of the plurality of sampling circuits (100) is electrically connected to one of the loads (102); and
and the upper computer (21) is electrically connected with the output ends of the analog-to-digital conversion circuits (400) and is used for acquiring a plurality of digital voltage values corresponding to the second detection voltages so as to determine the current value of each path of the load (102).
11. The high side current detection system of claim 10, wherein the power supply (101) provides a supply voltage greater than 1000V.
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| CN201922375397.3U CN211785744U (en) | 2019-12-26 | 2019-12-26 | High-side current detection device and system |
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| CN201922375397.3U CN211785744U (en) | 2019-12-26 | 2019-12-26 | High-side current detection device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899941A (en) * | 2021-09-27 | 2022-01-07 | 湖北航天技术研究院总体设计所 | Current acquisition circuit and acquisition method |
| CN115541983A (en) * | 2022-11-24 | 2022-12-30 | 南京中旭电子科技有限公司 | Hall current sensor with digital signal output |
-
2019
- 2019-12-26 CN CN201922375397.3U patent/CN211785744U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899941A (en) * | 2021-09-27 | 2022-01-07 | 湖北航天技术研究院总体设计所 | Current acquisition circuit and acquisition method |
| CN113899941B (en) * | 2021-09-27 | 2023-08-18 | 湖北航天技术研究院总体设计所 | Current acquisition circuit and acquisition method |
| CN115541983A (en) * | 2022-11-24 | 2022-12-30 | 南京中旭电子科技有限公司 | Hall current sensor with digital signal output |
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Address after: 201807 Shanghai City, north of the city of Jiading District Road No. 2258 Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 Shanghai City, north of the city of Jiading District Road No. 2258 Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |