CN113791281A - Full resistance detection system of multichannel electric detonator control circuit - Google Patents
Full resistance detection system of multichannel electric detonator control circuit Download PDFInfo
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Abstract
The invention belongs to the technical field of ground test control of liquid rocket engines, and particularly relates to a full resistance detection system of a multi-channel electric detonator control loop. The method solves the problem that the detection precision is difficult to guarantee in the existing full-resistance measurement method. The circuit comprises a constant current output circuit unit, an overcurrent detection circuit unit, a resistance measurement circuit unit, a switch driving circuit and an ARM main control unit. The constant current output circuit unit outputs a high-precision constant current on a control line of the ARM main control unit, and the overcurrent detection circuit unit turns off a constant current output channel after the output current exceeds a protection current threshold; the resistance measuring circuit unit adopts a four-wire resistance testing circuit. The resistance test of the electric detonator is carried out by adopting a constant current source method and a four-wire system resistance test method, and two lines excited by constant current and two lines tested by the voltage at two ends of the resistance are independently connected to two ends of the tested resistance, so that the impedance of wiring and contact resistance can be effectively eliminated, and the test precision is improved.
Description
Technical Field
The invention belongs to the technical field of ground test control of liquid rocket engines, and particularly relates to a full resistance detection system of a multi-channel electric detonator control loop.
Background
The full resistance value of an electric detonator control loop (the electric detonator control loop comprises an electric detonator power supply, a control microcomputer, a driving relay, a current-limiting resistor and an engine electric detonator) needs to be measured in a ground test of the liquid rocket engine. The full resistor comprises an electric detonator resistor, a control circuit resistor and a current-limiting resistor. The common methods for measuring the total resistance of an electric detonator control loop in the ground test of the liquid rocket engine mainly comprise a multimeter measurement method, a comparison circuit method and a constant current source method. The method generally requires to adopt electrostatic protection measures during the test of the multimeter measurement method, and tests are manually carried out, so that the operation is inconvenient, the interpretation error is large, and the measurement precision is low. The comparison circuit method adopts a standard precision resistor and a measured resistor to sample through the same constant current circuit to obtain voltage, and judges the resistance value of the measured resistor through the ratio of the voltage, so that the problem of the precision of the constant current source can be avoided, because the current ratio in the comparison circuit does not participate in operation, but how to ensure the consistency of the two sampling circuits of the comparison circuit is a great problem, if the two sampling circuits have difference, the detection precision of the resistor is influenced; the constant current source method mainly provides a high-precision constant current source for a detected resistor to excite, and calculates the resistance value of the electric detonator by using the ohm law by collecting the voltages at two ends of the detected resistor.
Disclosure of Invention
The invention provides a full-resistance detection system for a ground test electric detonator control loop of a liquid rocket engine, aiming at solving the problem that the detection precision is difficult to guarantee in the existing full-resistance measurement method.
In order to ensure the safety of the resistance test of the electric detonator, no matter which method is used, the current passing through the electric detonator must be ensured to be limited to a safe current (such as 10 mA). The invention adopts the constant current source method and carries out the resistance test of the electric detonator by a four-wire system resistance test method (Kelvin four-wire resistance test method), and connects two lines excited by constant current and two lines for testing the voltage at two ends of the resistance to be tested independently, thereby effectively eliminating the impedance of wiring and contact resistance and improving the test precision. Meanwhile, in order to ensure the safety of the electric detonator testing process, an overcurrent protection circuit and a self-locking circuit are adopted to carry out high-precision reliability testing on the electric detonator resistance in the testing process.
The technical scheme of the invention is to provide a full resistance detection system of a multi-channel electric detonator control loop, which is characterized in that: the device comprises a constant current output circuit unit, an overcurrent detection circuit unit, a resistance measurement circuit unit, a switch driving circuit and an ARM main control unit;
the constant current output circuit unit comprises a DAC (digital-to-analog converter), a V/I (voltage/input) circuit, a current monitoring circuit, a filtering and amplifying circuit and a 24-bit ADC (analog-to-digital converter) sampling circuit; the input end of the DAC is connected with the output end of the ARM main control unit, and the output end of the DAC is connected with the output end of the 24-bit ADC sampling circuit and then connected with the input end of the V/I circuit; the output end of the V/I circuit is connected with the input end of the current monitoring circuit through the current detection circuit unit, the output end of the current monitoring circuit is connected with the input end of the 24-bit ADC sampling circuit through the filtering and amplifying circuit, and the other output end of the 24-bit ADC sampling circuit is connected with the ARM main control unit; the DAC is used for outputting an analog voltage signal according to the command of the ARM main control unit; the V/I circuit is used for converting the voltage signal into a set current output which is used as constant current output excitation of resistance test; the current monitoring circuit is used for carrying out I/V conversion on the output current and converting the current into voltage; the filtering and amplifying circuit is used for carrying out noise reduction and voltage amplification on the current monitoring circuit; the 24-bit ADC sampling circuit is used for sampling the voltage value after filtering and amplifying;
the over-current detection circuit unit comprises a jitter-free high-speed switch, a self-locking circuit and an over-current protection circuit; the input end of the over-current protection circuit is connected with the output end of a V/I circuit in the constant current output circuit unit through a jitter-free high-speed switch, and the output end of the over-current protection circuit is respectively connected with the self-locking circuit and a current monitoring circuit in the constant current output circuit unit; the input end of the self-locking circuit is connected with the ARM main control unit, and the output end of the self-locking circuit is connected with the jitter-free high-speed switch; the overcurrent protection circuit is used for generating a pulse signal after the output current exceeds a protection current threshold value, triggering the self-locking circuit and controlling the jitter-free high-speed switch to turn off the loop; after overcurrent protection, the self-locking circuit is in a self-locking state, and the constant-current output channel is ensured to be in a turn-off state; when the overcurrent restart test is released, the ARM main control unit controls the self-locking circuit to close the jitter-free high-speed switch to ensure that the constant-current output loop is smooth, so that overcurrent protection is released;
the resistance measuring circuit unit comprises a matrix switch, a four-wire resistance testing circuit, a resistance measuring circuit, a filtering amplifying circuit and a 24-bit ADC sampling circuit; the input end of the matrix switch is connected with the output of a current monitoring circuit in the constant current output circuit unit; the output end of the matrix switch is connected with the four-wire system resistance test circuit; two lines excited by constant current and two lines tested by the voltage at two ends of the resistor are independently connected to two ends of the resistor to be tested through a four-wire system resistor test circuit; the resistance measuring circuit, the filtering amplifying circuit and the 24-bit ADC sampling circuit are sequentially and electrically connected, the input end of the resistance measuring circuit is connected with the output end of the matrix switch, and the output end of the 24-bit ADC sampling circuit is connected with the ARM main control unit; the output current of the constant current output circuit unit is output to each path of tested resistor through the matrix switch and the four-wire system resistor test circuit in sequence; the filtering and amplifying circuit is used for carrying out signal filtering and amplifying on the voltage signal subjected to voltage drop of each path of tested resistor, and the voltage signal is sampled and input to the ARM main control unit through the 24-bit ADC;
the input end of the switch driving circuit is connected with the output end of the ARM main control unit, and the output end of the switch driving circuit is connected with the input end of the matrix switch;
the ARM main control unit stores a computer program, and when the computer program is executed by a processor, the following processes are realized:
step 1, setting an output constant current value, and controlling DAC constant voltage output in a constant current output circuit unit; then, receiving a current value output by a 24-bit ADC sampling circuit in the constant current output circuit unit, comparing the current value with a set output constant current value, and if the difference value of the current value and the set output constant current value is not within a set error range, adjusting the output of the DAC until the constant current output meets the set output current value range;
step 2, setting a protection current threshold, comparing a current value output by the 24-bit ADC sampling circuit with the protection current threshold, if the output current value of the 24-bit ADC sampling circuit is larger than the protection current threshold, triggering a jitter-free high-speed switch through a self-locking circuit to cut off a current loop, wherein the self-locking circuit is in a self-locking state; when the overcurrent restart test is released, the self-locking circuit is controlled to close the jitter-free high-speed switch;
step 3, controlling the switching of the matrix switch through a switch driving circuit, and accessing different tested resistors;
and 4, receiving the output of a 24-bit ADC sampling circuit in the resistance measuring circuit, and calculating the resistance value of each path of measured resistance according to the formula that R is V/I.
Furthermore, the resistance measurement circuit unit also comprises an aerial plug interface connected with the matrix switch and used for connecting an external resistor to be measured.
Furthermore, the resistance measurement circuit unit also comprises a precision resistor connected with the matrix switch and used for metering the constant current value output by the constant current output circuit unit before testing. The method comprises the steps of carrying out constant current excitation on an onboard precision resistor by setting 10mA constant current excitation, measuring the voltage of the onboard precision resistor in a four-wire system, and calculating an actual constant current value according to the voltage and the resistance value of the precision resistor.
Furthermore, the resistance measurement circuit unit also comprises an external metering interface connected with the matrix switch, and the external metering interface is used for connecting external metering equipment to perform constant current output and resistance measurement precision metering.
Furthermore, the detection system also comprises an EMC filtering module which is used for carrying out EMC filtering on the power supply and removing the interference caused by the power supply module.
The invention has the beneficial effects that:
1. the resistance test of the electric detonator is carried out by adopting a constant current source method and a four-wire system resistance test method, and two lines excited by constant current and two lines tested by the voltage at two ends of the resistance are independently connected to two ends of the resistance to be tested, so that the impedance of wiring and contact resistance can be effectively eliminated, and the test precision is improved; meanwhile, in order to ensure the safety of the electric detonator testing process, an overcurrent protection circuit and a self-locking circuit are adopted to carry out high-precision reliability testing on the electric detonator resistance in the testing process.
2. The invention has an external metering interface, and is connected with external metering equipment through the interface to carry out constant current output and resistance measurement precision metering; and by setting a precision resistor, the constant current output current value is sampled by a 24-bit ADC sampling circuit, and the constant current output precision is calibrated.
3. The invention realizes closed-loop compensation through the constant current output circuit unit and the over-current detection unit and can provide high-precision constant current source excitation for the resistance to be detected.
4. The invention is provided with an overcurrent protection mechanism, and controls a non-jitter high-speed switch turn-off loop by triggering a self-locking circuit through an overcurrent protection circuit; the response time through the overcurrent protection circuit can be less than 1 ms.
5. The invention can diagnose the constant current value before measurement through the built-in precision resistor, and display the constant current value on the upper monitoring host through Ethernet communication.
Drawings
FIG. 1 is a schematic block diagram of a multi-channel electric detonator resistance test circuit of the present invention;
FIG. 2 is a schematic block diagram of a constant current output circuit unit according to the present invention;
FIG. 3 is a schematic block diagram of an over-current detection circuit unit according to the present invention;
FIG. 4 is a schematic block diagram of a resistance measurement circuit unit according to the present invention; wherein a is a functional block diagram of a four-wire resistance test circuit; b is a functional block diagram of a resistance measuring circuit, a filtering amplifying circuit and a 24-bit ADC sampling circuit;
fig. 5 is a schematic block diagram of the connection between the switch driving circuit and the matrix switch according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected: they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the multi-channel electric detonator control loop full-resistance detection system of the present embodiment includes an ARM main control unit, a constant current output circuit unit, an overcurrent detection circuit unit, a switch driving circuit, and a resistance measurement circuit unit.
The ARM main control unit is a main control center of the whole resistance testing system and is responsible for controlling other circuit functions and the communication function with the upper monitoring host. The method comprises the steps of controlling a constant current output circuit unit to output high-precision constant current, controlling an overcurrent detection circuit unit to turn off a constant current loop, controlling a matrix switch switching function, controlling a resistance measurement circuit to realize high-precision recovery to complete resistance value measurement and the like.
As shown in fig. 2, the constant current output circuit unit of this embodiment includes a DAC, a V/I circuit, a current monitoring circuit, a filtering and amplifying circuit, and a 24-bit ADC sampling circuit. The input end of the DAC is connected with the output end of the ARM main control unit, and the output end of the DAC is connected with one output end of the 24-bit ADC sampling circuit and then connected with the input end of the V/I circuit; the output end of the V/I circuit is connected with the input end of the current monitoring circuit through the overcurrent detection circuit unit, the output end of the current monitoring circuit is connected with the input end of the filtering amplification circuit, and the output end of the filtering amplification circuit is connected with the input end of the 24-bit ADC sampling circuit; the other output end of the 24-bit ADC sampling circuit is connected with the ARM main control unit;
the DAC is used for outputting an analog voltage signal; the V/I circuit is used for converting the analog voltage signal output by the DAC into current output; the current monitoring circuit is used for carrying out I/V (current-to-voltage) conversion on the output current and converting the current into voltage; the filtering and amplifying circuit is used for carrying out noise reduction and voltage amplification on the current monitoring circuit; and the 24-bit ADC sampling circuit is used for sampling the filtered and amplified voltage value.
In order to obtain a high-precision 10mA constant current source, the embodiment adopts a 24-bit ADC sampling circuit to acquire the current value of the constant current loop in real time, and adjusts the DAC in real time according to the current sampling to control the constant current output of the V-I circuit, thereby ensuring the high-precision output characteristic of the constant current source.
As shown in fig. 3, the over-current detection circuit unit of the present embodiment includes a jitter-free high-speed switch, a self-locking circuit and an over-current protection circuit; the overcurrent protection circuit is connected with the output end of the V/I circuit in the constant current output circuit unit through the jitter-free high-speed switch; the input end of the self-locking circuit is connected with the ARM main control unit, and the output end of the self-locking circuit is connected with the jitter-free high-speed switch.
When the loop has overcurrent of more than 20mA, the overcurrent protection circuit generates a pulse signal, triggers the self-locking circuit and controls the high-speed switch to immediately turn off the loop, and informs the ARM control unit; after the overcurrent is relieved, the ARM control unit can reset the self-locking circuit. In addition, the loop can be turned off directly through the ARM control unit, if the output current value of the 24-bit ADC sampling circuit is larger than the protection current threshold value, the self-locking circuit triggers the jitter-free high-speed switch to cut off a current loop, and the self-locking circuit is in a self-locking state.
With reference to fig. 1 and 4, the resistance measurement circuit unit of the present embodiment includes a matrix switch, a four-wire resistance test circuit, a resistance measurement circuit, a filtering and amplifying circuit, and a 24-bit ADC sampling circuit. The input end of the matrix switch is connected with a current monitoring circuit in the constant current output circuit unit; the output end of the matrix switch is connected with the four-wire system resistance test circuit; two lines excited by constant current and two lines tested by the voltage at two ends of the resistor are independently connected to two ends of the resistor to be tested through a four-wire system resistor test circuit; when the 10mA current of constant current source circuit is exported for every way resistance to be measured through the matrix switch, the resistance can produce the pressure drop, and this pressure drop is carried for 24 bit ADC sampling circuits through resistance measurement circuit difference analog signal conversion, and ARM main control unit can calculate every way resistance according to R ═ V/I formula, and embedded ARM control is sampled many times and is calculated average resistance.
The matrix switch can be connected with an aerial plug interface for connecting with external equipment to be tested; and the sampling circuit can also be connected with a precision resistor, and the constant current output current value is sampled through a 24-bit ADC sampling circuit to calibrate the constant current output precision. And the device can also be connected with an external metering interface and used for connecting external metering equipment to perform constant current output and resistance measurement precision metering.
As shown in fig. 5, in order to implement simultaneous measurement of multiple electrical squib resistances, the ARM main control unit controls the matrix switch by controlling the switch driving circuit to implement measurement of multiple electrical squib resistances. The matrix switch unit is connected with the electric detonator to be tested.
The testing device can also comprise an EMC filtering module which is used for carrying out EMC filtering on the power supply and removing interference caused by the power supply module.
The ARM main control unit stores a computer program, and when the computer program is executed by a processor, the following processes can be realized:
step 1, setting an output constant current value, and controlling DAC constant voltage output in a constant current output circuit unit; then, receiving a current value output by a 24-bit ADC sampling circuit in the constant current output circuit unit, comparing the current value with a set output constant current value, and if the difference value of the current value and the set output constant current value is not within a set error range, adjusting the output of the DAC until the constant current output meets the set output current value range;
step 2, setting a protection current threshold, comparing a current value output by the 24-bit ADC sampling circuit with the protection current threshold, if the output current value of the 24-bit ADC sampling circuit is larger than the protection current threshold, triggering a jitter-free high-speed switch through a self-locking circuit to cut off a current loop, wherein the self-locking circuit is in a self-locking state; when the overcurrent restart test is released, the self-locking circuit is controlled to close the jitter-free high-speed switch;
step 3, controlling the switching of a matrix switch through a switch driving circuit, and accessing different to-be-detected resistors;
and 4, receiving the output of a 24-bit ADC sampling circuit in the resistance measuring circuit, and calculating the resistance value of each path of measured resistance according to the formula that R is V/I.
Claims (5)
1. The utility model provides a full resistance detecting system of multichannel electric detonator control circuit which characterized in that: the device comprises a constant current output circuit unit, an overcurrent detection circuit unit, a resistance measurement circuit unit, a switch driving circuit and an ARM main control unit;
the constant current output circuit unit comprises a DAC (digital-to-analog converter), a V/I (voltage/input) circuit, a current monitoring circuit, a filtering and amplifying circuit and a 24-bit ADC (analog-to-digital converter) sampling circuit; the input end of the DAC is connected with the output end of the ARM main control unit, and the output end of the DAC is connected with the output end of the 24-bit ADC sampling circuit and then connected with the input end of the V/I circuit; the output end of the V/I circuit is connected with the input end of the current monitoring circuit through the current detection circuit unit, the output end of the current monitoring circuit is connected with the input end of the 24-bit ADC sampling circuit through the filtering and amplifying circuit, and the other output end of the 24-bit ADC sampling circuit is connected with the ARM main control unit; the DAC is used for outputting an analog voltage signal according to the command of the ARM main control unit; the V/I circuit is used for converting the voltage signal into a set current output which is used as constant current output excitation of resistance test; the current monitoring circuit is used for carrying out I/V conversion on the output current and converting the current into voltage; the filtering and amplifying circuit is used for carrying out noise reduction and voltage amplification on the current monitoring circuit; the 24-bit ADC sampling circuit is used for sampling the voltage value after filtering and amplifying;
the over-current detection circuit unit comprises a jitter-free high-speed switch, a self-locking circuit and an over-current protection circuit; the input end of the over-current protection circuit is connected with the output end of a V/I circuit in the constant current output circuit unit through a jitter-free high-speed switch, and the output end of the over-current protection circuit is respectively connected with the self-locking circuit and a current monitoring circuit in the constant current output circuit unit; the input end of the self-locking circuit is connected with the ARM main control unit, and the output end of the self-locking circuit is connected with the jitter-free high-speed switch; the overcurrent protection circuit is used for generating a pulse signal after the output current exceeds a protection current threshold value, triggering the self-locking circuit and controlling the jitter-free high-speed switch to turn off the loop; after overcurrent protection, the self-locking circuit is in a self-locking state, and the constant-current output channel is ensured to be in a turn-off state; when the overcurrent restart test is released, the ARM main control unit controls the self-locking circuit to close the jitter-free high-speed switch to ensure that the constant-current output loop is smooth, so that overcurrent protection is released;
the resistance measuring circuit unit comprises a matrix switch, a four-wire resistance testing circuit, a resistance measuring circuit, a filtering amplifying circuit and a 24-bit ADC sampling circuit; the input end of the matrix switch is connected with the output of a current monitoring circuit in the constant current output circuit unit; the output end of the matrix switch is connected with the four-wire system resistance test circuit; two lines excited by constant current and two lines tested by the voltage at two ends of the resistor are independently connected to two ends of the resistor to be tested through a four-wire system resistor test circuit; the resistance measuring circuit, the filtering amplifying circuit and the 24-bit ADC sampling circuit are sequentially and electrically connected, the input end of the resistance measuring circuit is connected with the output end of the matrix switch, and the output end of the 24-bit ADC sampling circuit is connected with the ARM main control unit; the output current of the constant current output circuit unit is output to each path of tested resistor through the matrix switch and the four-wire system resistor test circuit in sequence; the filtering and amplifying circuit is used for carrying out signal filtering and amplifying on the voltage signal subjected to voltage drop of each path of tested resistor, and the voltage signal is sampled and input to the ARM main control unit through the 24-bit ADC;
the input end of the switch driving circuit is connected with the output end of the ARM main control unit, and the output end of the switch driving circuit is connected with the input end of the matrix switch;
the ARM main control unit stores a computer program, and when the computer program is executed by a processor, the following processes are realized:
step 1, setting an output constant current value, and controlling DAC constant voltage output in a constant current output circuit unit; then, receiving a current value output by a 24-bit ADC sampling circuit in the constant current output circuit unit, comparing the current value with a set output constant current value, and if the difference value of the current value and the set output constant current value is not within a set error range, adjusting the output of the DAC until the constant current output meets the set output current value range;
step 2, setting a protection current threshold, comparing a current value output by the 24-bit ADC sampling circuit with the protection current threshold, if the output current value of the 24-bit ADC sampling circuit is larger than the protection current threshold, triggering a jitter-free high-speed switch through a self-locking circuit to cut off a current loop, wherein the self-locking circuit is in a self-locking state; when the overcurrent restart test is released, the self-locking circuit is controlled to close the jitter-free high-speed switch;
step 3, controlling the switching of the matrix switch through a switch driving circuit, and accessing different tested resistors;
and 4, receiving the output of a 24-bit ADC sampling circuit in the resistance measuring circuit, and calculating the resistance value of each path of measured resistance according to the formula that R is V/I.
2. The multi-channel electric detonator control loop full resistance detection system according to claim 1, characterized in that: the resistance measuring circuit unit also comprises an aerial plug interface connected with the matrix switch and used for connecting an external resistor to be measured.
3. The multi-channel electric detonator control loop full resistance detection system according to claim 2, characterized in that: the resistance measuring circuit unit also comprises a precision resistor connected with the matrix switch and used for metering the constant current value output by the constant current output circuit unit before testing.
4. The multi-channel electric detonator control loop full resistance detection system according to claim 3, characterized in that: the resistance measuring circuit unit also comprises an external metering interface connected with the matrix switch and used for connecting external metering equipment to perform constant current output and resistance measurement precision metering.
5. The multi-channel electric detonator control loop full resistance detection system according to claim 3, characterized in that: the power supply module is used for supplying power to the power supply module, and the power supply module is used for supplying power to the power supply module.
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| CN115047934A (en) * | 2022-07-04 | 2022-09-13 | 无锡新纺欧迪诺电梯有限公司 | Constant current source safety door lock detection circuit |
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| KR101111108B1 (en) * | 2011-05-30 | 2012-02-13 | 유양산전 주식회사 | apparatus protecting, detecting a constant current regulator for air field lighting |
| JP2015033054A (en) * | 2013-08-05 | 2015-02-16 | 日置電機株式会社 | Constant current generation circuit and method of protecting constant current generation circuit, constant current generation device and method of protecting constant current generation device, and resistance measurement device and resistance measurement method |
| CN105983178A (en) * | 2015-02-02 | 2016-10-05 | 深圳市科曼医疗设备有限公司 | Pace-making generation device |
| CN107132408A (en) * | 2017-06-28 | 2017-09-05 | 同济大学 | Commercial electric detonator tube resistor safety instrumentation and method |
| CN206960551U (en) * | 2017-06-28 | 2018-02-02 | 同济大学 | Commercial electric detonator tube resistor safety instrumentation |
| CN207742258U (en) * | 2018-01-03 | 2018-08-17 | 广西电网有限责任公司电力科学研究院 | A kind of loop resistance detection device for high-voltage circuitbreaker |
| CN208477016U (en) * | 2018-07-27 | 2019-02-05 | 深圳市迅科达智能科技有限公司 | A kind of circuit of multichannel resistance measurement |
| CN110940909A (en) * | 2019-10-18 | 2020-03-31 | 天津大学 | Measuring unit circuit for testing direct current parameter of integrated circuit |
| CN211859660U (en) * | 2020-04-28 | 2020-11-03 | 歌尔科技有限公司 | Charging overcurrent protection circuit and electronic equipment |
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| CN115047934A (en) * | 2022-07-04 | 2022-09-13 | 无锡新纺欧迪诺电梯有限公司 | Constant current source safety door lock detection circuit |
| CN115047934B (en) * | 2022-07-04 | 2024-03-12 | 无锡新纺欧迪诺电梯有限公司 | Constant current source safety door lock detection circuit |
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