CN113691021A - Isolated load switching circuit based on HPLC communication control - Google Patents
Isolated load switching circuit based on HPLC communication control Download PDFInfo
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- CN113691021A CN113691021A CN202111050108.8A CN202111050108A CN113691021A CN 113691021 A CN113691021 A CN 113691021A CN 202111050108 A CN202111050108 A CN 202111050108A CN 113691021 A CN113691021 A CN 113691021A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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Abstract
The invention discloses an isolated load switching circuit based on HPLC communication control, which belongs to the field of low-voltage power line carrier communication and characteristic current transmission and mainly comprises an isolated driving power supply circuit and a load switching circuit. The isolation driving power supply circuit realizes the suppression of the rear residual voltage of the electric energy meter by utilizing the characteristics of three-terminal composite heat-sensitive on the basis of providing a stable driving power supply for the rear-stage power switch tube; the load switching circuit fully utilizes totem pole drive and high-voltage power MOS characteristics to realize isolation negative feedback control, a power MOS grid drive voltage and a source power resistor are designed, and the load impedance change of the circuit is controlled through an HPLC _ PWM carrier switching signal, so that a current signal with a constant set rule is generated in a power grid; the circuit is easy to realize as a whole, can be highly integrated in an HPLC communication unit, is controllable in cost, is matched with identification equipment, does not need manual intervention, and can accurately divide the affiliation relationship between the transformer and the intelligent electric meter.
Description
Technical Field
The invention relates to the field of low-voltage power line carrier communication and characteristic current transmission, in particular to an isolated load switching circuit based on HPLC communication control, which is a key technology for building a smart grid fine-quality platform area, and particularly relates to a characteristic current transmission technology in a power system topology identification process.
Background
At present, the current topological relation of a transformer area is changed frequently due to frequent change of power grid user information, fault replacement of an electric energy meter, upgrading and transformation of a fine transformer area and the like, the cross-transformer-area meter reading function can be realized through the existing communication modes such as mainstream HPLC (high performance liquid chromatography) carrier waves and micropower wireless communication, the greater difficulty is brought to the combing of the topological relation of the transformer area undoubtedly, even the existing rural power grid, the overhead line and the ground cable of the urban network transformer area are shared, the circuit of the transformer area is complex, the membership relation between the power utilization phase of a user and the transformer area is difficult to accurately distinguish without adopting a mode of manually patrolling the line and matching with the power failure of the transformer area, and the refined line loss calculation cannot be realized.
The characteristic current sending is a precondition for realizing a platform area topology identification technology, a traditional characteristic current sending circuit adopts a power frequency voltage zero-crossing time control switch to realize short circuit of a zero line and a live line in a short time, so that large-amplitude short-circuit current is generated on a power line instantly, and the characteristic current sending circuit has the defects of influencing power supply reliability and being incapable of being miniaturized. Therefore, the technical problem that a characteristic current sending circuit is integrated in the existing HPLC communication unit of the national network based on the HPLC carrier communication technology becomes a topology identification technology to be overcome urgently.
Therefore, an isolation load switching circuit based on HPLC communication control is developed to solve the technical problem.
Disclosure of Invention
The invention aims to solve the problems that: the utility model provides an isolation load switching circuit based on HPLC communication control to realize the integrated characteristic current transmission circuit in the current HPLC communication unit of national grid.
The invention provides an isolated load switching circuit based on HPLC communication control, which comprises an isolated driving power circuit and a power switch tube load switching circuit. The isolation driving power supply circuit realizes the suppression of the rear residual voltage of the electric energy meter by utilizing the characteristics of three-terminal composite heat-sensitive on the basis of providing a stable driving power supply for the rear-stage power switch tube; the power switch tube load switching circuit fully utilizes totem pole drive and high-voltage power MOS characteristics to realize isolation negative feedback control, a power MOS grid drive voltage and a source power resistor are designed, and load impedance change of the circuit is isolated and controlled by utilizing an optical coupler working condition through an HPLC-PWM carrier switching signal, so that a current signal with a constant set rule is generated in a power grid;
compared with the prior art, the invention has the advantages that the high integration is realized on the basis of the existing HPLC communication technology, the working conditions of the optical coupler and the characteristics of the totem circuit are fully utilized by the whole functional circuit, and the working state of the power switch tube is matched with the HPLC _ PWM control signal to generate the characteristic current with configurable frequency, code elements and constant amplitude. The circuit is easy to realize, easy to integrate and miniaturize, has no influence on power supply reliability and is low in cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts, and the drawings are as follows:
fig. 1 is a circuit diagram of an embodiment of an isolated load switching circuit based on HPLC communication control according to the present invention;
FIG. 2 is a time domain waveform diagram of characteristic current fed to a power line during load switching of an isolated load switching circuit based on HPLC communication control according to the present invention;
FIG. 3 is a time domain waveform diagram of the theoretical simulation of the characteristic current fed to the power line during the load switching of the isolated load switching circuit based on HPLC communication control according to the present invention;
fig. 4 is a characteristic current spectrum diagram fed to a power line when an isolated load switching circuit based on HPLC communication control switches a load according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly and completely understood, the following description of the embodiments of the present invention with reference to the accompanying drawings of the embodiments of the present invention makes clear that the described embodiments are one, but not all embodiments of the present invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without any inventive step are within the scope of the present invention.
Fig. 1 is a circuit diagram of an embodiment of an isolation load switching circuit based on HPLC communication control according to the present invention, where the circuit includes an isolation driving power circuit and a power switching tube load switching circuit. The isolation driving power supply circuit can not only protect abnormal scenes such as pulse or lightning surge and the like, but also provide a stable driving power supply for the rear-stage power switching tube; the load switching circuit mainly realizes the isolation control of an HPLC-PWM signal and the generation of constant current in a load switching period. Specifically, the isolation driving power supply circuit plays a role in rectification and provides the drain voltage of a rear-stage power switch tube on the one hand, and on the other hand, the three-terminal composite thermosensitive characteristic is comprehensively utilized, so that the isolation driving power supply circuit can play a role in protecting abnormal heavy current of a switching circuit and can prevent the whole circuit from being damaged by impulse interference such as pulse or surge. The isolation driving power supply circuit utilizes the characteristics of the high-voltage power switch tube to design a linear voltage stabilizing circuit to output a post-stage switch power tube driving power supply. On one hand, the load switching circuit realizes strong and weak current isolation through the optical coupler, and meanwhile, the HPLC-PWM control signal can effectively prevent the phenomenon that the software acts abnormally to cause the failure of a rear-stage circuit by utilizing the high-pass filtering characteristic. The totem pole driving output pole adopts an upper resistor connected with the collector of an NPN transistor, the emitter of the tube is connected with the collector of the PNP transistor below the tube for output at the same time, the emitter of the lower tube is grounded, and the bases of the two tubes are respectively connected with the control of the front stage. Namely an upper output pipe and a lower output pipe which are connected in series from the direct current perspective, and the connection position of the two output pipes is an output end. The upper tube is conducted, the lower tube is conducted, the upper tube is cut off and outputs a high level, the lower tube is conducted, the upper tube is cut off and outputs a low level, and if the circuit logic can cut off the upper tube and the lower tube, the output is in a high-resistance state. The current driving capability is improved through totem-pole driving, and the process of charging or discharging the gate electrode charge of the rear-stage power switch tube is rapidly completed.
Fig. 2 is a time domain waveform diagram of characteristic current fed to a power line during load switching of an isolation load switching circuit based on HPLC communication control according to the present invention. The HPLC main chip controls an HPLC _ PWM pin to enable and output code element information containing specific frequency components through an OOK modulation mode, the figure shows that the code element information on a power line captured by an oscilloscope in the primary characteristic current sending process is an AAE9 time development figure, the amplitude of the characteristic current is 400mA, the frequency is 833.33Hz, and the duty ratio is 1/3.
Fig. 3 is a time domain waveform diagram of the theoretical simulation of the characteristic current fed to the power line during the load switching of the isolated load switching circuit based on the HPLC communication control. According to a certain coding rule, simulation data with the amplitude of 400mA, the frequency of 833.33Hz and the duty ratio of 1/3 are generated in an OOK modulation mode, the graph is consistent with a time domain waveform captured by an actual oscilloscope in the figure 2, and feasibility of the scheme is verified.
Fig. 4 is a characteristic current spectrum diagram fed to the power line during load switching of the isolated load switching circuit based on HPLC communication control according to the present invention. The graph is a spectrum diagram of data collected by one-time transmitting of the AAE9 symbol shown in fig. 2 after DFT data operation.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. The scope of the invention is indicated by the appended claims.
Claims (11)
1. An isolated load switching circuit based on HPLC communication control, comprising: and the isolation driving power supply circuit and the power switch tube load switching circuit.
2. The isolated load switching circuit based on HPLC communication control as claimed in claim 1, wherein the isolated driving power circuit comprises RT1 three-terminal composite thermal sensitive, D1 glass passivation standard patch rectifier and C1 filter capacitor.
3. The isolated load switching circuit based on HPLC communication control of claim 1, wherein the isolated driving power supply circuit comprises: the power supply comprises R1, R2, R3 and R4 voltage dividing resistors, a VT1 high-voltage power switch tube, a VD1 Zener diode, C2, C3, C4 and C5 filtering energy storage capacitors and an R5 current-limiting resistor.
4. The isolated load switching circuit based on HPLC communication control as claimed in claim 1, wherein the isolated driving power supply circuit D1 rectifier bridge V + is connected in series with the gate of the switch tube VT1 through the R1 and R2 resistors and connected in series with the drain of the switch tube VT1 through the R3 and R4 resistors, the VT1 source is connected in series with the R5 resistors and then connected in parallel with the C3, C4 and C5 capacitors to output the power VCC, one end of each of the C2, C3, C4 and C5 capacitors is connected to the power ground VSS, wherein the anode of the VD1 Zener diode is connected to the power ground VSS, and the cathode of the VD1 Zener diode is connected to the gate of the switch tube VT 1.
5. An isolated load switching circuit based on HPLC communication control as claimed in claim 1, wherein the load switching circuit comprises: the device comprises an HPLC-PWM control circuit, a totem-pole drive circuit and a power switch tube load switching circuit.
6. The isolated load switching circuit based on HPLC communication control of claim 5, wherein the HPLC _ PWM control circuit comprises: the software abnormity protection circuit comprises a current-limiting resistor R7, an O1 isolation optocoupler, a capacitor C6, a diode VD2, a resistor R6 and a transistor VT 5.
7. The isolated load switching circuit based on HPLC communication control of claim 5, wherein in the HPLC _ PWM control circuit, one end of the R7 resistor is connected with a 3.3V power supply, and the other end is connected with an O11 pin of the optical coupler; the HPLC _ PWM signal is connected with the grid electrode of a transistor VT2 through a capacitor C6, the drain electrode of the transistor VT2 is connected with a pin 2 of the optical coupler, and the source electrode is connected with GND; the cathode of the diode VD2 is connected with the grid of the transistor VT2, and the anode is connected with GND; one end of the resistor R6 is connected to the gate of the transistor VT2, and the other end is connected to GND.
8. An isolated load switching circuit based on HPLC communication control as claimed in claim 5, wherein the totem-pole drive circuit comprises: the circuit comprises a resistor R8, an NPN triode VT3, a PNP triode VT4 and a resistor R9; one end of the resistor R8 is connected with an O14 pin of the optocoupler and the base electrode of the triode VT4, and the other end is connected with the base electrode of the triode VT 3; the collector of the triode VT3 and the optocoupler O13 are connected with VCC, the emitter of the triode VT3 is connected with the collector output of the triode VT4, and the emitter of the VT4 is grounded VSS; one end of the resistor R9 is connected to the base of the transistor VT4, and the other end is connected to the power ground VSS.
9. The isolated load switching circuit based on HPLC communication control of claim 5, wherein the power switch tube load switching circuit comprises a resistor R10, a diode VD3, a resistor R11, a resistor R12, a Zener diode VD4, a power switch tube VT5, a capacitor C7, a resistor R13 and a resistor R14.
10. The isolated load switching circuit based on HPLC communication control as claimed in claim 5, wherein the power switch tube load switching circuit, resistors R10, R11 are connected in parallel with totem pole drive output, wherein another end of R11 is connected with grid of power switch tube VT5, another end of R10 is connected with cathode of diode VD3, anode of diode VD3 is connected with grid of switch tube VT 5; one end of the resistor R12 is connected with a power ground VSS, and the other end is connected with the grid electrode of the switch tube VT 5; the cathode of the Zener diode VD4 is connected with the grid of the switch tube VT5, and the anode is connected with a power ground VSS; the capacitor C7 is connected in parallel between the grid and the source of the switch tube VT 5; the drain of the switching tube VT5 is connected to the rectified output VIN, and the source is connected in parallel to the power ground VSS through the resistors R13 and R14.
11. The isolated load switching circuit based on HPLC communication control as claimed in claim 1, wherein the implementation mechanism is to make the communication unit chip IO send modulated specific information code element by HPLC control signal, wherein the modulation mode is OOK; the amplitude of the characteristic current which carries code element information and is fed to the power line is constant within a certain time, the load can dynamically follow the change of power frequency voltage on the assumption that the switching circuit impedance is R, and the amplitude of the current of the whole switching circuit is constant during the high level period of an HPLC-PWM control pin and is externally shown as a strong robustness characteristic; if the power frequency grid voltage is shown as the formula (1) and the designed switching current is 400mA, the circuit load R (t) is shown as the formula (2),
U(t)＝311×sin(2πf0t+θ), (1)
R(t)＝777.5×sin(2πf0t+θ), (2)
where t represents time and θ is the initial phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111050108.8A CN113691021A (en) | 2021-09-08 | 2021-09-08 | Isolated load switching circuit based on HPLC communication control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111050108.8A CN113691021A (en) | 2021-09-08 | 2021-09-08 | Isolated load switching circuit based on HPLC communication control |
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| Publication Number | Publication Date |
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| CN113691021A true CN113691021A (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111050108.8A Withdrawn CN113691021A (en) | 2021-09-08 | 2021-09-08 | Isolated load switching circuit based on HPLC communication control |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1722600A2 (en) * | 2005-05-10 | 2006-11-15 | Siemens airfield solutions, inc. | Dedicated LED airfield system architectures |
| CN203056571U (en) * | 2012-12-27 | 2013-07-10 | 徐大鹏 | Low residual voltage lightning protection device for power supply |
| CN110572019A (en) * | 2018-06-06 | 2019-12-13 | 青岛鼎信通讯股份有限公司 | wide-range, high-reliability and low-EMI flyback switching power supply |
| CN111600380A (en) * | 2020-03-28 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Variable load and constant current detection-based household variable relation identification method |
| CN212183122U (en) * | 2020-04-02 | 2020-12-18 | 青岛鼎信通讯股份有限公司 | Lightning protection voltage-resistant overcurrent protection circuit applied to products in power industry |
| CN112234592A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | Lightning surge protection circuit |
| CN112803411A (en) * | 2021-04-02 | 2021-05-14 | 国网浙江省电力有限公司营销服务中心 | Signal sending circuit for station area topology identification and identification method |
-
2021
- 2021-09-08 CN CN202111050108.8A patent/CN113691021A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1722600A2 (en) * | 2005-05-10 | 2006-11-15 | Siemens airfield solutions, inc. | Dedicated LED airfield system architectures |
| CN203056571U (en) * | 2012-12-27 | 2013-07-10 | 徐大鹏 | Low residual voltage lightning protection device for power supply |
| CN110572019A (en) * | 2018-06-06 | 2019-12-13 | 青岛鼎信通讯股份有限公司 | wide-range, high-reliability and low-EMI flyback switching power supply |
| CN112234592A (en) * | 2019-12-20 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | Lightning surge protection circuit |
| CN111600380A (en) * | 2020-03-28 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Variable load and constant current detection-based household variable relation identification method |
| CN212183122U (en) * | 2020-04-02 | 2020-12-18 | 青岛鼎信通讯股份有限公司 | Lightning protection voltage-resistant overcurrent protection circuit applied to products in power industry |
| CN112803411A (en) * | 2021-04-02 | 2021-05-14 | 国网浙江省电力有限公司营销服务中心 | Signal sending circuit for station area topology identification and identification method |
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Application publication date: 20211123 |
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