CN110726868A - Isolated direct current electric quantity acquisition and switching value control circuit - Google Patents
Isolated direct current electric quantity acquisition and switching value control circuit Download PDFInfo
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- CN110726868A CN110726868A CN201911087443.8A CN201911087443A CN110726868A CN 110726868 A CN110726868 A CN 110726868A CN 201911087443 A CN201911087443 A CN 201911087443A CN 110726868 A CN110726868 A CN 110726868A
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- 238000002955 isolation Methods 0.000 claims abstract description 147
- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000003306 harvesting Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005192 partition Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000007488 abnormal function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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Abstract
The invention discloses an isolated direct current electric quantity acquisition and switching value control circuit. The circuit comprises a high-voltage electric area, a weak-current electric area, a middle electric area and a power supply electric area, wherein every two areas are electrically isolated (a voltage difference of more than 1000V may exist between the ground levels). The middle electric area is used as a 'buffer area', and after the isolation effect of the first-stage acquisition and isolation module is reduced or lost, the existence of the second-stage acquisition and isolation module enables the weak-current electric area to be still isolated from the strong-current electric area, so that the personal safety is fully ensured. By means of the switch value and the partition area of analog signal acquisition, noise is isolated when the digital value jumps, interference on analog acquisition is reduced, and accuracy of analog acquisition is improved. Through the electrical isolation of the power supply and the weak current communication part, the anti-interference capability of the communication module is enhanced, and the safety of a weak current electrical area is further ensured.
Description
Technical Field
The invention relates to the technical field of direct current electric quantity acquisition, in particular to an isolated direct current voltage and current acquisition and switching value input and output control circuit.
Background
The voltage of a direct current bus of a power system is usually over 1000V, and the current is over hundreds of amperes or even thousands of amperes, which far exceeds the safe voltage that a human body can bear. The circuit breaker is an indispensable device in a power system, and often needs to have voltage and current acquisition capability and switching value input and output control capability in addition to a conventional switching-on and switching-off function. For the collection of such strong voltage and current, the isolation of strong and weak digital signals must be handled. Traditional electric quantity collection often uses one-level isolation module, in case isolation effect reduces or loses isolation effect, can make the weak current part electrified, and this seriously threatens personnel's personal safety. The switching value input of the circuit breaker is generally an instruction on whether to close a switch, an instruction on whether to break a fault, and the like; the switching value output is generally a command for switching on or off the release. The switching value is located inside the circuit breaker, and the device is not led out, so that the switching value cannot be touched by people under normal conditions.
Disclosure of Invention
The invention aims to provide an isolated direct current electric quantity acquisition and switching value control circuit.
Specifically, the present invention provides an isolated dc power acquisition and switching value control circuit, which is characterized by comprising: the high-voltage electric area, the weak-current electric area, the middle electric area and the power supply electric area are electrically isolated from each other two by two.
Preferably, the system also comprises a first-stage isolation power supply module, a second-stage isolation power supply module, a first-stage acquisition isolation module, a second-stage acquisition isolation module with an isolation power supply, a switching value input isolation module, a switching value output isolation module, a data processing module, a switching value input module, a switching value output module and a communication module, wherein the first-stage isolation power supply module is positioned between the power supply electrical area and the middle electrical area, one side of the first-stage isolation power supply module is positioned in the power supply electrical area and is powered by an external power supply, and the other side of the first-stage isolation power supply module is positioned in the middle electrical area and is used for powering the middle electrical area and the second-stage isolation power supply module; the second-stage isolation power supply module is positioned between the middle electric area and the strong electric area and used for supplying power to the modules of the strong electric area; the first-stage acquisition and isolation module is positioned between the strong electric area and the middle electric area, and the data processing module receives the digital signals obtained by the analog-to-digital conversion module and outputs the digital signals to the middle electric area through the first-stage acquisition and isolation module; the second-stage acquisition and isolation module with the isolation power supply is positioned between the middle electric area and the weak-current electric area, receives the isolation digital signal output by the first-stage acquisition and isolation module and forwards the isolation digital signal to the weak-current electric area; the switching value input isolation module and the switching value output isolation module are positioned between a strong electric area and a middle electric area, one side of the switching value input isolation module and one side of the switching value output isolation module are positioned in the middle electric area, and one side of the switching value input isolation module and one side of the switching value output isolation module are positioned in the strong electric area.
Preferably, the first-stage isolation power supply module and the second-stage isolation power supply module are isolation power supply chips with the capability of electrically isolating voltage of more than 1000V between a source side and a secondary side; the first-stage acquisition isolation module, the switching value input isolation module and the switching value output isolation module are signal isolation devices which are isolated through optical isolation or magnetic isolation technical means.
Preferably, the system further comprises a resistance voltage division sensor module, a shunt current sensor module and an analog-to-digital conversion module, wherein the resistance voltage division sensor module is used for measuring the voltage of the target equipment in the high-current electric area, the shunt current sensor module is used for measuring the current of the target equipment in the high-current electric area, and the analog-to-digital conversion module receives the voltage and the current and converts the voltage and the current into digital signals.
Preferably, the high-voltage electrical area, the weak-current electrical area, the intermediate electrical area and the power supply electrical area are respectively grounded and are not commonly grounded.
Preferably, the first-stage acquisition isolation module and the switching value input isolation module are optical couplers or magnetic isolation chips. The switching value output isolation module is an optical coupler or a relay.
Preferably, the second-stage acquisition isolation module with the isolation power supply is an isolation communication chip for integrated power supply.
Preferably, the second-stage acquisition isolation module with the isolation power supply is a CAN isolation transceiver or a 485 isolation transceiver, and the switching value output isolation module is an optical coupler or a relay.
The invention has the beneficial effects that: the middle electric area is used as a 'buffer area', after the isolation effect is reduced or lost by the first-stage acquisition and isolation module, the existence of the second-stage acquisition and isolation module enables the weak-current electric area to be still isolated from the strong-current electric area, and personal safety is fully guaranteed. By means of the switch value and the partition area of analog signal acquisition, noise is isolated when the digital value jumps, interference on analog acquisition is reduced, and accuracy of analog acquisition is improved. Through the electrical isolation of the power supply and the weak current communication part, the anti-interference capability of the communication module is enhanced through the noise of the decoupling power supply, and the safety of a weak current electrical area is further ensured.
Drawings
Fig. 1 is a schematic block diagram of an isolated dc power acquisition and switching value control circuit according to the present invention.
FIG. 2 is a graph showing the relationship between the operating voltage of an isolation device of a certain type and the lifetime of the device.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The electric area of the power supply is an auxiliary power supply 24V of the power system, which is from an auxiliary power grid of the power system, and although the auxiliary power supply belongs to a weak power grid, the quality of the power supply 24V is poor due to the complex diversity of loads, and even in an extreme case, strong electricity is introduced, for example, in the case of a failure of a ship power supply system. The acquisition control circuit is applied to acquisition control under the condition of the complex power supply.
As shown in fig. 1, the isolated dc power acquisition and switching value control circuit of the present embodiment includes: the high-voltage electric area, the weak-current electric area, the middle electric area and the power supply electric area are electrically isolated from each other two by two, are respectively grounded and are not grounded together.
Specifically, the isolated direct current electric quantity acquisition and switching value control circuit comprises a first-stage isolation power supply module, a second-stage isolation power supply module, a first-stage acquisition isolation module, a second-stage acquisition isolation module with an isolation power supply, a switching value input isolation module, a switching value output isolation module, a data processing module, a switching value input module, a switching value output module and a communication module, wherein the first-stage isolation power supply module is positioned between an electric area of the power supply and a middle electric area, one side of the first-stage isolation power supply module is positioned in the electric area of the power supply and is powered by an external power supply, and the other side of the first-stage isolation power supply module is positioned in the middle electric area and is used for supplying power to the middle electric area and the second-stage isolation power; the second-stage isolation power supply module is positioned between the middle electric area and the strong electric area and used for supplying power to the modules of the strong electric area; the first-stage acquisition and isolation module is positioned between the strong electric area and the middle electric area, and the data processing module receives the digital signals obtained by the analog-to-digital conversion module and outputs the digital signals to the middle electric area through the first-stage acquisition and isolation module; the second-stage acquisition and isolation module with the isolation power supply is positioned between the middle electric area and the weak-current electric area, receives the isolation digital signal output by the first-stage acquisition and isolation module and forwards the isolation digital signal to the weak-current electric area; the switching value input isolation module and the switching value output isolation module are positioned between a strong electric area and a middle electric area, one side of the switching value input isolation module and one side of the switching value output isolation module are positioned in the middle electric area, and one side of the switching value input isolation module and one side of the switching value output isolation module are positioned in the strong electric area.
The isolated direct current electric quantity acquisition and switching value control circuit further comprises a resistance voltage division sensor module, a shunt current sensor module and an analog-to-digital conversion module, wherein the resistance voltage division sensor module is used for measuring the voltage of the target equipment in the strong current electric area, the shunt current sensor module is used for measuring the current of the target equipment in the strong current electric area, and the analog-to-digital conversion module receives the voltage and the current and converts the voltage and the current into digital signals.
For example, the first-stage isolation power supply module is composed of a TMR3-2411HI isolation power supply chip (of course, peripheral circuits such as a diode, a capacitor, a resistor and the like can be added as appropriate), and the TMR3-2411HI has the capability of isolating 3000V.
The second-stage isolation power supply module is composed of a THB 3-0511 isolation power supply chip, and the THB 3-0511 has the capability of isolating 6000V voltage.
The first-stage acquisition isolation module is composed of an ADUM262 magnetic isolation chip, and the ADUM262 has the capacity of isolating 5000V voltage.
The second-stage acquisition isolation module with the isolation power supply is composed of a CTM1051M, the CTM1051M has the capability of isolating 2500V voltage, and meanwhile, the isolation power supply is arranged in the chip and can supply power to weak current areas.
The communication module is composed of a common mode inductor, a CAN communication terminal resistor, a TVS chip and the like which are matched with the CTM1051M for use.
The switching value input isolation module is composed of an optocoupler TLP 293.
The switching value input module is composed of a resistor, a capacitor, and a switch contact which are engaged with the TLP293, and is used only for providing a switching value input command (0 or 1).
The switching value output isolation module is composed of a relay J65/KJZC and has the isolation capacity of more than 1000V.
The switching value output module is composed of a resistor, a diode, a triode and the like which are matched with the relay.
The data processing module is composed of a DSP chip TMS320F28335 and peripheral circuits.
The analog-to-digital converter module is composed of an ADC built in TMS320F 28335.
The resistance-divided voltage sensor is composed of a series of voltage dividing circuits.
The current divider current sensor is composed of a current divider and a filter circuit.
Under the normal condition, the circuit continuously collects the voltage and current waveforms of a strong current region in real time through a voltage division sensor, and reads whether the current switch is in a switching-off state, a switching-on state or a fault state through a switching value input module and a switching value isolation input module; when a power system has a fault (for example, when a short circuit occurs, the current is increased sharply), the circuit can send a switching-off instruction to the outside through the switching value isolation output module and the switching value output module at the first time, and the influence of an accident is avoided or reduced. And meanwhile, stopping the acquisition of the analog quantity, and sending the acquired current and voltage waveforms before and after the fault moment to an upper computer or a console for analyzing the reason of the fault.
The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the claims of the present invention, therefore, various changes, modifications and equivalents of the embodiments of the present invention may be made within the scope of the claims of the present invention.
Simulation (Emulation)
The isolation voltage of the isolation device is generally designated as XXV @1min (e.g., TMR3-2411HI isolation voltage is 3000V @1min), which is an evaluation of the transient voltage endurance of the device, and the experimental basis is derived from the US national laboratory UL1577 standard. In actual operation, the lifetime of the isolation device is inversely proportional to the value of the isolation voltage across the isolation device (i.e., the voltage difference between the high-voltage electrical region, the weak-current electrical region, the intermediate electrical region, and the power supply region). That is, as the isolation voltage loading increases, the device lifetime decreases, as shown in fig. 2.
If the middle electric area in fig. 1 is not available, if the isolation voltage between the strong electric area and the weak electric area exceeds the standard due to the failure of the power system, the isolation device reaches the service life of the device in N years, and if hidden dangers are found and the circuit board is replaced through circuit maintenance before N years, the isolation between the strong electric area and the weak electric area of the circuit fails, and safety accidents are easy to happen.
If the isolated direct current electric quantity acquisition and switching value control circuit is adopted, after N years, the service life of an isolation device between the middle electric area and the weak current electric area cannot be reduced (the service life is more than 80 years in fig. 2) due to the existence of the second-stage isolation and the normal condition, so that the weak current electric area of the working circuit board is still safe. The isolation life of the whole circuit is improved to at least 2N years. And when the first-stage isolation device reaches the service life of N years, other faults (such as abnormal functions of the communication module) often occur, and therefore workers can be reminded to replace the circuit board. In an ideal situation, the circuit of the invention can reduce the potential safety hazard to the minimum.
When the switching value jumps between 0 and 1, the corresponding edges can generate spike interference, and the ground level of the middle electric area can also jump. The power supply electrical area is isolated from the weak current electrical area, and if the noise of power supply is too large, the influence of the power supply electrical area on the communication module can be isolated; if the power supply introduces strong electricity under extreme conditions, the safety of the weak electricity electric area can be ensured.
Claims (7)
1. An isolated DC power acquisition and switching value control circuit, comprising: the high-voltage electric area, the weak-current electric area, the middle electric area and the power supply electric area are electrically isolated from each other two by two.
2. An isolated direct current electric quantity acquisition and switching value control circuit is characterized by comprising a first-stage isolation power supply module, a second-stage isolation power supply module, a first-stage acquisition isolation module, a second-stage acquisition isolation module with an isolation power supply, a switching value input isolation module, a switching value output isolation module, a data processing module, a switching value input module, a switching value output module and a communication module, wherein the first-stage isolation power supply module is positioned between an electric area of a power supply and a middle electric area, one side of the first-stage isolation power supply module is positioned in the electric area of the power supply and is powered by an external power supply, and the other side of the first-stage isolation power supply module is positioned in the middle electric area and is used for powering the middle electric area and the second-stage isolation power supply module; the second-stage isolation power supply module is positioned between the middle electric area and the strong electric area and used for supplying power to the modules of the strong electric area; the first-stage acquisition and isolation module is positioned between the strong electric area and the middle electric area, and the data processing module receives the digital signals obtained by the analog-to-digital conversion module and outputs the digital signals to the middle electric area through the first-stage acquisition and isolation module; the second-stage acquisition and isolation module with the isolation power supply is positioned between the middle electric area and the weak-current electric area, receives the isolation digital signal output by the first-stage acquisition and isolation module and forwards the isolation digital signal to the weak-current electric area; the switching value input isolation module and the switching value output isolation module are positioned between a strong electric area and a middle electric area, one side of the switching value input isolation module and one side of the switching value output isolation module are positioned in the middle electric area, and one side of the switching value input isolation module and one side of the switching value output isolation module are positioned in the strong electric area.
3. The isolated direct current electric quantity acquisition and switching value control circuit according to claim 2, wherein the first stage isolated power supply module and the second stage isolated power supply module are isolated power supply chips having a capability of electrically isolating a voltage of more than 1000V between a source side and a secondary side; the first-stage acquisition isolation module, the switching value input isolation module and the switching value output isolation module are signal isolation devices which are isolated through optical isolation or magnetic isolation technical means.
4. The isolated dc power acquisition and switching value control circuit according to claim 2, further comprising a resistive voltage division sensor module for measuring the voltage of the target device in the high power electrical area, a shunt current sensor module for measuring the current of the target device in the high power electrical area, and an analog-to-digital conversion module for receiving the voltage and current and converting them into digital signals.
5. An isolated dc power harvesting and switching volume control circuit according to claim 2, wherein the high voltage, low current, intermediate and power supply electrical regions are grounded, respectively, and are not commonly grounded.
6. The isolated direct current power acquisition and switching value control circuit according to claim 2, wherein the second stage acquisition and isolation module with the isolated power supply is an isolated communication chip for integrated power supply.
7. The isolated DC power acquisition and switching value control circuit of claim 2, wherein the second stage acquisition and isolation module with isolated power supply is a CAN isolation transceiver or a 485 isolation transceiver.
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| CN201911087443.8A CN110726868B (en) | 2019-11-08 | 2019-11-08 | Isolated direct-current electric quantity acquisition and switching value control circuit |
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| CN201911087443.8A CN110726868B (en) | 2019-11-08 | 2019-11-08 | Isolated direct-current electric quantity acquisition and switching value control circuit |
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| CN110726868B CN110726868B (en) | 2024-06-11 |
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2019
- 2019-11-08 CN CN201911087443.8A patent/CN110726868B/en active Active
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| CN102230945A (en) * | 2011-04-15 | 2011-11-02 | 奇瑞汽车股份有限公司 | High-voltage isolation direct-current voltage acquisition circuit |
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| CN206348377U (en) * | 2016-12-28 | 2017-07-21 | 深圳圣斯尔电子技术有限公司 | A kind of high direct voltage isolating transmitter |
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