CN115575687A - Isolated voltage measuring device and measuring method - Google Patents
Isolated voltage measuring device and measuring method Download PDFInfo
- Publication number
- CN115575687A CN115575687A CN202211167309.0A CN202211167309A CN115575687A CN 115575687 A CN115575687 A CN 115575687A CN 202211167309 A CN202211167309 A CN 202211167309A CN 115575687 A CN115575687 A CN 115575687A
- Authority
- CN
- China
- Prior art keywords
- voltage
- processor
- isolated
- signal isolator
- voltage comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 238000000691 measurement method Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims 1
- 238000013459 approach Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses an isolated voltage measuring device, which belongs to the technical field of voltage measurement and comprises a processor, a first signal isolator, a second signal isolator, a filter circuit, a voltage comparator and a power supply, wherein the processor can generate PWM waves with adjustable duty ratio and is electrically connected with the first signal isolator, the first signal isolator is also electrically connected with the input end of the filter circuit, the output end of the filter circuit is electrically connected with one input end of the voltage comparator, the other input end of the voltage comparator is electrically connected with a voltage to be measured, the output end of the voltage comparator is electrically connected with the first signal isolator, the power supply supplies power to the first signal isolator, the second signal isolator and the voltage comparator, the PWM waves generated by the processor are output to one input end of the voltage comparator, and the processor can acquire level signals output by the voltage comparator from the first signal isolator. The isolation type voltage measuring device is compact in structure and high in measuring precision.
Description
Technical Field
The invention belongs to the technical field of voltage measurement, and particularly relates to an isolated voltage measurement device and a measurement method.
Background
Voltage measurement is an important component in the fields of industry, consumer electronics and medical electronics. In general, voltage measurement systems may be damaged due to unstable conditions such as dangerous voltages, transient signals, common mode voltages and oscillating potentials, and even the whole electronic system may be seriously damaged during measurement, resulting in serious consequences. To overcome these disadvantages, the measurement system needs to be electrically isolated from the network under test.
The existing voltage measurement method mainly includes that voltage signal acquisition is carried out through an integrated circuit directly or after voltage division, and a measured system is isolated by a voltage sensor, wherein the measured system and the measured system cannot be electrically isolated, and the measured system are electrically isolated by the voltage sensor, but the voltage sensor is expensive and large in size, and cannot be widely applied to small-sized circuit design, so that an isolated voltage measurement device with proper price, high reliability and small size is urgently needed at present.
Disclosure of Invention
In view of this, the present invention provides an isolated voltage measurement apparatus, which uses a signal isolator to electrically isolate a measurement system from a system to be measured, and uses a processor, a filter circuit, a voltage comparator, etc. to form the isolated voltage measurement apparatus, thereby realizing reliable and safe isolated voltage measurement.
The isolated voltage measuring device adopts the following technical scheme:
an isolated voltage measuring device comprises a processor, a first signal isolator, a second signal isolator, a filter circuit, a voltage comparator and a power supply;
the processor can generate PWM waves with adjustable duty ratios and is electrically connected with the first signal isolator;
the first signal isolator is also electrically connected with the input end of the filter circuit;
the output end of the filter circuit is electrically connected with one input end of the voltage comparator;
the other input end of the voltage comparator is electrically connected with the voltage to be measured, and the output end of the voltage comparator is electrically connected with the first signal isolator, and the power supply supplies power to the first signal isolator, the second signal isolator and the voltage comparator;
the PWM wave generated by the processor is output to one input end of the voltage comparator after passing through the first signal isolator and the filter circuit, and the processor can collect a level signal output by the voltage comparator from the first signal isolator.
Further, the voltage measuring device further comprises a voltage dividing circuit;
the voltage to be measured is electrically connected with the voltage comparator after being divided by the voltage dividing circuit.
Further, the filter circuit is an RC filter circuit.
Further, the first signal isolator is a dual-channel digital isolator.
Further, the second signal isolation is an isolated DC/DC power supply module.
Further, the power supply comprises a first power supply and a second power supply;
the first power supply supplies power to the reverse channel of the dual-channel digital isolator and the voltage comparator after passing through the isolated DC/DC power supply module;
the second power supply supplies power to the forward channel of the dual-channel digital isolator and the processor.
Further, the processor is an ARM processor.
In addition, the invention also provides an isolated voltage measuring method, which utilizes the isolated voltage measuring device, and the processor enables the equivalent voltage of the PWM wave to continuously approach the measured voltage by adjusting the duty ratio of the PWM wave according to the high-low level signal output by the voltage comparator, thereby realizing isolated voltage measurement.
The isolated voltage measuring method adopts the following technical scheme:
an isolated voltage measuring method, the isolated voltage measuring device comprises the following steps:
the method comprises the following steps: the processor outputs PWM waves, voltage is input to the positive input end of the voltage comparator after the PWM waves sequentially pass through the first signal isolator and the filter circuit, and voltage is input to the negative input end of the voltage comparator when the voltage to be detected is detected;
step two: the processor acquires a level signal output by the output end of the voltage comparator from the first signal isolator;
step three: if the processor acquires a high level, the processor reduces the duty ratio of the output PWM wave, otherwise, the processor increases the duty ratio of the output PWM wave;
step four: and the processor judges whether the set time length is reached, if the set time length is reached, the product of the current duty ratio of the PWM wave and the amplitude of the PWM wave is used as the voltage value of the voltage to be measured after voltage division, and if not, the step one is returned to.
Further, in the third step, the processor determines the degree of decrease and increase of the duty ratio of the PWM wave according to the dichotomy.
Further, a range of the duty ratio of the PWM wave from 0 to 1 is set as an initial interval range of the bisection.
Has the advantages that:
(1) In the isolated voltage measuring device, a processor can generate PWM waves with adjustable duty ratio and is electrically connected with a first signal isolator, the first signal isolator is also electrically connected with an input end of a filter circuit, an output end of the filter circuit is electrically connected with one input end of a voltage comparator, the other input end of the voltage comparator is electrically connected with a measured voltage, an output end of the voltage comparator is electrically connected with the first signal isolator, a power supply supplies power to the first signal isolator, a second signal isolator and the voltage comparator, the PWM waves generated by the processor are output to one input end of the voltage comparator after passing through the first signal isolator and the filter circuit, and the processor can acquire level signals output by the voltage comparator from the first signal isolator.
(2) The voltage to be measured is electrically connected with the other input end of the voltage comparator after being divided by the voltage dividing circuit, so that the voltage to be measured is connected to the voltage comparator in a voltage-reducing mode, and safety is guaranteed; moreover, because the amplitude voltage (generally about 5V) of the PWM wave output by the processor is generally smaller than the measured voltage, after the voltage is divided by the voltage dividing circuit, the voltage input into the voltage comparator by the measured voltage can be smaller than the amplitude voltage of the PWM wave, so that the equivalent voltage of the PWM wave can continuously approach the voltage divided by the measured voltage by changing the duty ratio of the PWM wave, and the measured voltage can be obtained according to the equivalent voltage of the PWM wave.
(3) The filter circuit is an RC filter circuit, so that the processor can input stable constant voltage to the input end of the voltage comparator on the basis of simpler circuit structure, and the accuracy of measured voltage measurement is ensured.
(4) The second signal isolator is an isolated DC/DC power supply module and can generate a group of voltages isolated from an input power supply, so that the system voltage (power supply voltage) is isolated from the voltage close to the measured voltage, and the safety is ensured.
(5) The first signal isolator is a double-channel digital isolator, so that the electrical isolation between the processor and the voltage to be measured can be realized, and the safety is ensured; and the processor can acquire the level signal output by the voltage comparator from the first signal isolator, and further adjust the duty ratio of the output PWM wave according to the level signal, so that the equivalent voltage of the PWM wave continuously approaches to the measured voltage, and the measured voltage is obtained according to the equivalent voltage of the PWM wave.
(6) The processor is an ARM processor, and can efficiently and automatically adjust the duty ratio of the PWM wave according to a program, so that the circuit structure of the measuring device is simpler, and the measured voltage measuring result is more accurate.
(7) In the isolated voltage measuring method, when the processor acquires a high level, the processor reduces the duty ratio of the output PWM wave, otherwise, the processor increases the duty ratio of the output PWM wave, and the equivalent voltage of the PWM wave can be continuously close to the measured voltage by circulating for multiple times in a set time period.
(8) In the isolated voltage measurement method, the processor adjusts the duty ratio of the PWM wave by using a dichotomy method, namely if the output of the voltage comparator is a high level (if the voltage of the PWM wave after being filtered is input into the positive input end of the voltage comparator), the dichotomy method is used for reducing the duty ratio of the PWM wave, so that the voltage (namely the equivalent voltage of the PWM wave) input into the positive input end of the voltage comparator after being filtered is closer to the voltage to be measured, if the output of the voltage comparator is a low level, the dichotomy method is used for increasing the duty ratio of the PWM wave, so that the voltage of the PWM wave input into the positive input end of the voltage comparator after being filtered is closer to the voltage to be measured, the steps are repeated within a set time length, the voltage of the PWM wave input into the positive input end of the voltage comparator after being filtered is closer to the voltage to be measured, and the voltage value to be measured is obtained rapidly.
Drawings
Fig. 1 is a schematic diagram illustrating a hardware connection principle of an isolated voltage measuring device according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an isolated voltage measuring device according to an embodiment of the present invention;
fig. 3 is a flowchart of an isolated voltage measuring method according to a second embodiment of the present invention;
the circuit comprises a 1-ARM processor, a 2-first signal isolator, a 3-filter circuit, a 4-voltage comparator, a 5-second signal isolator, a 6-second power supply and a 7-voltage division circuit.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The first embodiment is as follows:
the isolated voltage measuring device is described in the present embodiment by taking the voltage of the sprung thermal battery (the voltage is generally 28 ± 8V) as the measured voltage.
Referring to fig. 1 to 2, the isolated voltage measuring apparatus includes a processor, a first signal isolator 2, a second signal isolator 5, a filter circuit 3, a voltage comparator 4, and a power supply, wherein:
the processor can generate PWM waves with adjustable duty ratio and is electrically connected with the first signal isolator 2, the first signal isolator 2 is also electrically connected with the input end of the filter circuit 3, the output end of the filter circuit 3 is electrically connected with one input end of the voltage comparator 4, the other input end of the voltage comparator 4 is electrically connected with the voltage to be measured, the output end of the voltage comparator 4 is electrically connected with the first signal isolator 2, the power supply supplies power to the first signal isolator 2, the second signal isolator 2 and the voltage comparator 4, the PWM waves generated by the processor are output to one input end of the voltage comparator 4 after passing through the first signal isolator 2 and the filter circuit 3, and the processor can acquire level signals output by the voltage comparator 4 from the first signal isolator 2.
The isolation type voltage measuring device has the advantages of compact structure, small volume, low price of each component hardware, and, the measuring device realizes the electrical isolation of a power supply and a processor in a measuring system from a measured voltage through the first signal isolator 2 and the second signal isolator 5, and in addition, on the basis of electrical isolation, the processor can continuously adjust the duty ratio of the PWM wave output by the processor according to the high-low level signal output by the voltage comparator 4 collected from the first signal isolator 2, taking the example that the PWM wave is filtered by the first signal isolator 2 and the filter circuit 3 to form a stable voltage (i.e. the equivalent voltage of the PWM wave) and then is connected to the positive input terminal of the voltage comparator 4, if the output of the voltage comparator 4 is high level, it means that after the PWM wave is level-converted by the first signal isolator 2 and filtered by the filter circuit 3, the steady voltage (i.e. the equivalent voltage of the PWM wave) formed at V1 is greater than the voltage at the negative input terminal of the voltage comparator 4 (i.e. the voltage to be measured or the voltage at V2 after voltage division of the voltage to be measured), at this time, the duty ratio of the PWM wave is reduced (the amplitude voltage of the PWM wave is unchanged), the equivalent voltage of the PWM wave at V1 can be closer to the voltage to be measured, if the output of the voltage comparator 4 is low level, it means that the stable voltage formed by the level conversion of the PWM wave through the first signal isolator 2 and the filtering of the filter circuit 3 is less than the voltage at the negative input terminal of the voltage comparator 4, and at this time, the duty ratio of the PWM wave is increased (the amplitude voltage of the PWM wave is unchanged), the equivalent voltage of the PWM wave can be closer to the voltage to be measured, therefore, the equivalent voltage of the PWM wave continuously approaches to the measured voltage, and the aim of isolated voltage measurement can be fulfilled.
In addition, if the voltage of the measured voltage directly connected to the voltage comparator 4 is greater than the amplitude voltage of the PWM wave, only the duty ratio of the PWM wave is adjusted, and the equivalent voltage of the PWM wave is still always less than the measured voltage, and the voltage comparator 4 can always output only one level signal. As shown in fig. 2, a voltage divider circuit 7 is arranged in a circuit structure diagram of the isolated voltage measuring device, and the voltage divider circuit 7 connects a resistor R2 with a resistance value of 8K and a resistor R3 with a resistance value of 1K in series with the measured voltage and then grounds the two in series, so that the measured voltage can be reduced to be connected to the input end of the voltage comparator 4, and the safety of measurement can be ensured; moreover, because the amplitude voltage (generally 3V or 5V) of the PWM wave generated by the processor is generally smaller than the measured voltage, after the voltage is divided by the voltage dividing circuit 7, the voltage at the V2 position where the measured voltage is input into the voltage comparator 4 can be ensured to be smaller than the amplitude voltage of the PWM wave, so that the equivalent voltage of the PWM wave can be ensured to continuously approach the voltage at the V2 position after the voltage division of the measured voltage by changing the duty ratio of the PWM wave, and the measured voltage can be obtained according to the equivalent voltage of the PWM wave.
As shown in fig. 2, the filter circuit 3 in this embodiment is an RC filter circuit formed by a resistor R1 with a resistance of 4.7K and a capacitor C5 with a capacitance of 0.1 μ F, and the filter circuit 3 can enable the processor 1 to input a stable constant voltage (i.e., a voltage at V1) to the input end of the voltage comparator on the basis of a relatively simple circuit structure, thereby ensuring the accuracy of the subsequent measurement of the measured voltage.
More specifically, in the present embodiment, as shown in fig. 1 and 2, the power supply includes a first power supply of 5V and a second power supply 6 of 3.3V; the second signal isolator 5 is an isolated DC/DC power supply module with the model number of FB0505T-1WR4, and the isolated DC/DC power supply module can generate a group of voltages isolated from the second power supply 6, so that a 5V input power supply is isolated from the voltage to be measured, and the safety is ensured; in addition, the first signal isolator 2 is a dual-channel digital isolator (belonging to an electromagnetic isolator) of the type admm 1201 CRZ. As can be seen from fig. 2, the 5V first power supply supplies 5V working voltage to the reverse channel of the dual-channel digital isolator and the voltage comparator 4 after passing through the isolated DC/DC power supply module. At this time, the 3.3V second power supply 6 is used to supply power to the processor and the forward channel of the dual-channel digital isolator. Moreover, it can be seen that a capacitor C1 and a capacitor C2, both of which have a capacitance of 10 μ F, are connected in parallel between the 5V first power supply and the second signal isolator 5, so as to perform an input filtering function on the first power supply; the output end of the second signal isolator 2 is provided with a capacitor C3 and a capacitor C4 which both have 10 muF capacitance in parallel, and the output filtering effect on the first power supply is achieved.
Furthermore, the processor of this embodiment selects the ARM processor 1 of the model STM32F411CEU6 to complete the functions of outputting PWM waves and adjusting the duty ratio of the PWM waves, and the ARM processor 1 has high integration level, so that the circuit structure of the measuring device is simpler, and the measured voltage measurement result is more accurate.
Specifically, as shown in fig. 2, the 3.3V second power supply 6 provides 3.3V working voltage for the forward channel of the dual-channel digital isolator and the ARM processor 1. And the ARM processor 1 outputs a PWM wave with the amplitude voltage of 3.3V to a forward channel of the dual-channel digital isolator, the PWM wave with the amplitude voltage of 5V is converted and output in a reverse channel after passing through the dual-channel digital isolator, a stable voltage value is formed at a position V1 after the PWM wave with the amplitude voltage of 5V is subjected to RC filtering, and the stable voltage value is the product of the 5V and the duty ratio of the PWM wave, namely the equivalent voltage of the PWM wave. After voltage of a measured voltage is divided by a resistor R2 and a resistor R3, a negative input end of a voltage comparator is connected to a V2 position (the voltage of the V2 position is one ninth of the measured voltage), when the voltage of the V1 position is larger than the voltage of the V2 position, the voltage comparator 4 outputs a high level of about 5V and processes the high level to be output to a VIA port of the double-channel digital isolator, the ARM processor 1 acquires a high level signal of 3.3V converted by the double-channel digital isolator at the VOA port of the double-channel digital isolator, if the voltage of the V1 position is smaller than the voltage of the V2 position, the voltage comparator 4 outputs a low level (which can be regarded as 0V), and the voltage acquired by the ARM processor 1 is also the low level (which can be regarded as 0V). Because the voltage at the V1 position can be changed by adjusting the duty ratio of the PWM wave through the ARM processor 1, when the voltage comparator 4 outputs a high level, it indicates that the voltage at the V1 position is greater than the voltage at the V2 position (which is a characteristic of the voltage comparator 4 itself), at this time, the duty ratio of the PWM wave is adjusted through the ARM processor 1, the voltage at the V1 position is reduced, when the voltage comparator 4 outputs a low level, it indicates that the voltage at the V1 position is lower than the voltage at the V2 position, at this time, the duty ratio of the PWM wave is increased through the ARM processor 1, and the operation is repeated, so that the voltage at the V1 position can approach the voltage at the V2 position. Because the amplitude voltage of the PWM wave is 5V and is a fixed value, and the latest duty ratio of the PWM wave (which refers to the duty ratio determined finally after the duty ratio of the PWM wave is adjusted to be large and small in a series) can be known by the ARM processor 1, the voltage at the V1 position can be solved, and the voltage at the V1 position is infinitely close to the voltage at the V2 position, so that the voltage at the V2 position is regarded as being equal to the voltage at the V1 position, and the solved measured voltage is nine times of the voltage at the V1 position.
Example two:
the present embodiment provides an isolated voltage measuring method based on the first embodiment.
Referring to fig. 3, the method includes the steps of:
the method comprises the following steps: the processor outputs PWM waves, voltage is input to the positive input end of the voltage comparator 4 after passing through the first signal isolator 2 and the filter circuit 3 in sequence, and the voltage to be measured is input to the negative input end of the voltage comparator 4;
step two: the processor collects the level signal output by the voltage comparator 4 from the first signal isolator 2;
step three: if the processor acquires a high level (3.3V), the processor 1 reduces the duty ratio of the output PWM wave, otherwise, the processor increases the duty ratio of the output PWM wave;
step four: and the processor judges whether the set time length is reached, if the set time length is reached, the product of the current duty ratio of the PWM wave and the amplitude of the PWM wave is used as the voltage value of the voltage to be measured after voltage division, and if not, the step one is returned to.
More specifically, the degree of decrease and increase in the duty ratio of the PWM wave is determined by dichotomy in the present embodiment. As shown in fig. 3, pwmd [0] is defined as the current duty ratio, two intermediate variables pwmd [1] and pwmd [2] are defined, and an initial value pwmd [1] =0 (representing that the duty ratio of the PWM wave is 0) and pwmd [2] =1 (representing that the duty ratio of the PWM wave is 1) are assigned. Within a set 10ms (the duration can be flexibly designed according to specific working conditions), the ARM processor determines the latest current duty ratio pwmd [0] of the PWM wave by using a dichotomy by judging the level of the VOA port of the dual-channel digital isolator (3.3V is high level, and 0V is low level), and by using a formula: measured voltage = pwmd [0] V45V, and the value of the measured voltage is obtained.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An isolated voltage measuring device is characterized by comprising a processor, a first signal isolator, a second signal isolator, a filter circuit, a voltage comparator and a power supply;
the processor can generate PWM waves with adjustable duty ratio and is electrically connected with the first signal isolator;
the first signal isolator is also electrically connected with the input end of the filter circuit;
the output end of the filter circuit is electrically connected with one input end of the voltage comparator;
the other input end of the voltage comparator is electrically connected with the voltage to be measured, and the output end of the voltage comparator is electrically connected with the first signal isolator, and the power supply supplies power to the first signal isolator, the second signal isolator and the voltage comparator;
the PWM wave generated by the processor passes through the first signal isolator and the filter circuit and then is output to one input end of the voltage comparator, and the processor can collect a level signal output by the voltage comparator from the first signal isolator.
2. An isolated voltage measurement device according to claim 1, further comprising a voltage divider circuit;
the voltage to be measured is electrically connected with the voltage comparator after being divided by the voltage dividing circuit.
3. An isolated voltage measurement device according to claim 1 or 2, wherein the filter circuit is an RC filter circuit.
4. An isolated voltage measurement device according to claim 3, wherein the first signal isolator is a dual channel digital isolator.
5. An isolated voltage measurement device according to claim 4, wherein the second signal isolation is an isolated DC/DC power supply module.
6. An isolated voltage measurement device according to claim 5, wherein said power source comprises a first power source and a second power source;
the first power supply supplies power to the reverse channel of the dual-channel digital isolator and the voltage comparator after passing through the isolated DC/DC power supply module;
the second power supply supplies power to the forward channel of the dual-channel digital isolator and the processor.
7. An isolated voltage measurement device as claimed in any one of claims 1, 2 and 4 to 6 wherein said processor is an ARM processor.
8. An isolated voltage measuring method using the isolated voltage measuring apparatus according to any one of claims 1 to 7, comprising the steps of:
the method comprises the following steps: the processor outputs PWM waves, voltage is input to the positive input end of the voltage comparator after the PWM waves sequentially pass through the first signal isolator and the filter circuit, and the voltage to be measured inputs voltage to the negative input end of the voltage comparator;
step two: the processor collects a level signal output by the output end of the voltage comparator from the first signal isolator;
step three: if the processor acquires a high level, the processor reduces the duty ratio of the output PWM wave, otherwise, the processor increases the duty ratio of the output PWM wave;
step four: and the processor judges whether a set time length is reached, if the set time length is reached, the product of the current duty ratio of the PWM wave and the amplitude of the PWM wave is used as the voltage value of the voltage to be measured after voltage division, and if not, the step I is returned.
9. An isolated voltage measurement method according to claim 8, wherein in step three, the processor determines the degree of decrease and increase of the duty cycle of the PWM wave according to a dichotomy.
10. The isolated voltage measuring method according to claim 9, wherein a range of a duty ratio of the PWM wave from 0 to 1 is set as an initial interval range of the dichotomy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211167309.0A CN115575687A (en) | 2022-09-23 | 2022-09-23 | Isolated voltage measuring device and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211167309.0A CN115575687A (en) | 2022-09-23 | 2022-09-23 | Isolated voltage measuring device and measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115575687A true CN115575687A (en) | 2023-01-06 |
Family
ID=84581478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211167309.0A Pending CN115575687A (en) | 2022-09-23 | 2022-09-23 | Isolated voltage measuring device and measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115575687A (en) |
-
2022
- 2022-09-23 CN CN202211167309.0A patent/CN115575687A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102156019B (en) | Pressure sensor | |
| CN200996992Y (en) | Corrugating fast inspecter of micro-radar medical low-voltage power supply | |
| CN104237831A (en) | Set for calibrating tester of arrester counter | |
| CN109951925A (en) | Adjustable resistance and its current ripples of application eliminate circuit and line voltage compensation circuit | |
| CN107037255B (en) | Voltage ripple detection circuit | |
| CN204101715U (en) | A kind of counter of lightning arrester tester calibration device | |
| CN105652099B (en) | A kind of micro- capacitance difference detection method based on switching circuit | |
| CN110289656A (en) | Battery management circuit and battery module | |
| CN104678861A (en) | Circuit with adjustable threshold voltage for collecting digital signals | |
| CN115575687A (en) | Isolated voltage measuring device and measuring method | |
| CN108304023A (en) | A kind of Switching Power Supply high load stability compensation circuit | |
| CN115656638B (en) | MLCC capacitance test positive and negative signal acquisition circuit and method | |
| CN107782462A (en) | Voltage comparator circuit, temperature detection circuit and voltage comparative approach | |
| CN102697500A (en) | Current source application system applied to multi-frequency electrical impedance tomography and implementing method for system | |
| CN210401605U (en) | Equipment for detecting stability of direct-current power supply | |
| CN211123004U (en) | Quick detection device of high-low voltage cabinet | |
| CN212066740U (en) | Ultrasonic bone mineral density detection circuit | |
| CN106124865A (en) | The measuring method of the capacitance of differential capacitance and device | |
| CN112325979B (en) | Dynamic closed-loop control multichannel capacitive oil mass sensor signal conditioning system and method | |
| CN220525896U (en) | Open-short circuit test circuit based on hardware short-term test | |
| CN210572495U (en) | Self-measuring circuit | |
| CN115951116B (en) | Peak current detection system and test method | |
| CN111417859A (en) | Load impedance tester and measuring method | |
| CN204515414U (en) | A kind of for gathering the adjustable circuit of digital signal threshold voltage | |
| CN212909348U (en) | Feedback circuit used in power supply voltage reduction chip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |