CN202535264U - Second-stage power supply circuit used for MOA resistive current detection system - Google Patents
Second-stage power supply circuit used for MOA resistive current detection system Download PDFInfo
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- CN202535264U CN202535264U CN2012201135197U CN201220113519U CN202535264U CN 202535264 U CN202535264 U CN 202535264U CN 2012201135197 U CN2012201135197 U CN 2012201135197U CN 201220113519 U CN201220113519 U CN 201220113519U CN 202535264 U CN202535264 U CN 202535264U
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Abstract
The utility model discloses a second-stage power supply circuit used for an MOA resistive current detection system, wherein the MOA resistive current detection system comprises a CVT monitoring casing and an MOA monitoring casing, the CVT monitoring casing comprises a first protection circuit, a first microprocessor, a first amplification circuit, a first GPS module, a first wireless communication module and a first Flash memory, the MOA monitoring casing comprises a second protection circuit, a second microprocessor, a second amplification circuit, a second GPS module, a second wireless communication module, a second Flash memory, a keyboard and a display screen, the second-stage power supply circuit is connected with a first-stage power supply circuit, the first-stage power supply circuit converts a 220V AC voltage in the power grid into a 12V DC voltage and outputs the 12V DC voltage to the second-stage power supply circuit, the second-stage power supply circuit comprises a DC/DC conversion chip, a load circuit and an anti-electromagnetic interference filter, and also comprises a switch voltage stabilizer and a transient state inhibiting diode, the DC/DC conversion chip receives the 12V DC voltage and outputs a +/-5V DC voltage, the +/-5V DC voltage orderly passes through the load circuit and the anti-electromagnetic interference filter, the switch voltage stabilizer receives the 12V DC voltage and outputs a 5V DC voltage, and the negative electrode of the transient state inhibiting diode is connected with the input end of the switch voltage stabilizer, and the positive electrode of the transient state inhibiting diode is grounded.
Description
Technical field
The utility model relates to a kind of power circuit, relates in particular to the second level power circuit that is used for a kind of MOA (zinc oxide arrester) current in resistance property detection system.
Background technology
Traditional zinc oxide arrester detection system is introduced required voltage signal and current signal in the same equipment; Voltage signal is that the secondary side of the capacitance type potential transformer (CVT) from transformer station takes out; Current signal can take out through current transformer from the earth connection of zinc oxide arrester (MOA); The perhaps lightning stroke counter through the zinc oxide arrester lower end is clipped in the two ends of lightning stroke counter with current clamp, gets method of current through small resistor resistive total current is taken out.So just need be in whole measuring process in the secondary side wiring of CVT.In order to save the CVT secondary side wiring in the measuring process, the applicant in submitting on the same day of the application the patent application of " a kind of MOA current in resistance property detection system " by name, like Fig. 1.Again for to system power supply, change the 220V alternating voltage of electrical network into the 12V direct voltage, the applicant has submitted the patent application of " first order power circuit that is used for a kind of MOA current in resistance property detection system " by name on the same day, like Fig. 2.But, how particularly various piece to be supplied power, be still the problem that needs solve.
Summary of the invention
The purpose of the utility model is to overcome the defective of prior art and the second level power circuit that is provided for a kind of MOA current in resistance property detection system; Basis at " first order power circuit that is used for a kind of MOA current in resistance property detection system "; The 12V direct voltage is converted into respectively ± 5V direct voltage and 5V direct voltage; Wherein ± and the 5V direct voltage is amplifying circuit and the display screen power supply in " a kind of MOA current in resistance property detection system ", power supply provides the basis to the 5V direct voltage to miscellaneous part for next step.
The technical scheme that realizes above-mentioned purpose is:
The second level power circuit that is used for a kind of MOA current in resistance property detection system; Said MOA current in resistance property detection system comprises CVT monitor cartridge and MOA monitor cartridge; Said CVT monitor cartridge comprises first protective circuit; First microprocessor; First amplifying circuit; The one GPS (global positioning system) module; First wireless communication module and a Flash (Flash Memory) memory; Said MOA monitor cartridge comprises second protective circuit; Second microprocessor; Second amplifying circuit; The 2nd GPS module; Second wireless communication module; The 2nd Flash memory; Keyboard and display screen
Said second level power circuit connects a first order power circuit, and this first order power circuit changes the 220V alternating voltage of electrical network the 12V direct voltage into and flows to said second level power circuit,
Said second level power circuit comprises DC/DC conversion chip, load circuit and the anti-emi filter that connects successively, also comprises switching regulator and Transient Suppression Diode, wherein:
Said DC/DC conversion chip receives said 12V direct voltage and output ± 5V direct voltage, this ± the 5V direct voltage passes through said load circuit and anti-emi filter successively;
Said switching regulator receives said 12V direct voltage and exports the 5V direct voltage;
The negative pole of said Transient Suppression Diode connects the input of said switching regulator, plus earth.
The above-mentioned second level power circuit that is used for a kind of MOA current in resistance property detection system, wherein, said load circuit comprises electrochemical capacitor E10 parallel with one another and resistance R 3, and electrochemical capacitor E13 parallel with one another and resistance R 36, wherein:
The two ends of the said electrochemical capacitor E10 branch road that 3 parallel connections form with resistance R are connected the positive output and output ground of said DC/DC conversion chip respectively;
The two ends of the said electrochemical capacitor E13 branch road that 36 parallel connections form with resistance R are connected the negative output and output ground of said DC/DC conversion chip respectively.
The above-mentioned second level power circuit that is used for a kind of MOA current in resistance property detection system; Wherein, Said anti-emi filter comprises the common mode inductance L3 that connects said DC/DC conversion chip two outputs, and the electrochemical capacitor E11 and the electrochemical capacitor E14 that connect common mode inductance L3 respectively.
The above-mentioned second level power circuit that is used for a kind of MOA current in resistance property detection system, wherein, the input of said DC/DC conversion chip connects electrochemical capacitor E12, the other end ground connection of this electrochemical capacitor E12.
The above-mentioned second level power circuit that is used for a kind of MOA current in resistance property detection system, wherein, said Transient Suppression Diode parallel connection electrochemical capacitor E15 and capacitor C 39.
The above-mentioned second level power circuit that is used for a kind of MOA current in resistance property detection system, wherein, said switching regulator output connects a fly-wheel diode and an inductance respectively, wherein:
The negative pole of said fly-wheel diode connects the output of said switching regulator, plus earth;
Said inductance is through electrochemical capacitor E16 parallel with one another and capacitor C 40 ground connection.
The beneficial effect of the utility model is: the utility model is on the basis of " first order power circuit that is used for a kind of MOA current in resistance property detection system "; The 12V direct voltage is converted into respectively ± 5V direct voltage and 5V direct voltage; Wherein ± and the 5V direct voltage is amplifying circuit and the display screen power supply in " a kind of MOA current in resistance property detection system ", power supply provides the basis to the 5V direct voltage to miscellaneous part for next step.Simultaneously, the utility model is simple in structure, is easy to realization and with low cost.
Description of drawings
Fig. 1 is the structural representation of MOA current in resistance property detection system;
Fig. 2 is the circuit diagram that is used for a kind of first order power circuit of MOA current in resistance property detection system;
Fig. 3 is the circuit diagram of the second level power circuit that is used for a kind of MOA current in resistance property detection system of the utility model.
Embodiment
To combine accompanying drawing that the utility model is described further below.
See also Fig. 1, the MOA monitor cartridge 2 that MOA current in resistance property detection system comprises the CVT monitor cartridge 1 that connects CVT and is connected the lightning stroke counter two ends that the MOA lower end is connected in series, CVT monitor cartridge 1 and 2 wireless connections of MOA monitor cartridge, wherein:
CVT monitor cartridge 1 comprises first microprocessor 11; And first amplifying circuit 12 that is connected respectively with this first microprocessor 11, a GPS module 13, first wireless communication module 14 and a Flash memory 15; And first protective circuit 16 that connects first amplifying circuit 12, this first protective circuit 16 connects the secondary output of CVT.
See also Fig. 2; The first order power circuit that is used for MOA current in resistance property detection system comprises successively the transformer J8, rectifier bridge U15 and the power supply chip U17 that connect, the first electrochemical capacitor E9 parallel with one another, the second electrochemical capacitor E8 and first capacitor C 30, diode D7 and second capacitor C 31.
See also Fig. 3; The second level power circuit that is used for a kind of MOA current in resistance property detection system of the utility model; Second level power circuit connects said first order power circuit; This first order power circuit changes the 220V alternating voltage of electrical network the 12V direct voltage into and flows to said second level power circuit
Said second level power circuit comprises DC/DC conversion chip U19, load circuit 100 and the anti-emi filter 200 that connects successively, also comprises switching regulator U20, Transient Suppression Diode D9, sustained diode 10 and inductance L 6, wherein:
DC/DC conversion chip U19 receives 12V direct voltage and output ± 5V direct voltage, should ± the 5V direct voltage passes through load circuit 100 and anti-emi filter 200 successively; Load circuit 100 is false unloaded, be connected on DC/DC conversion chip U19 output (± VO) preventing zero load or low carrying, thereby the instability of avoiding burning out element and chip or causing output, in the present embodiment, the resistance of load circuit 100 is 300 Ω.Anti-emi filter 200 eliminate DC/DC conversion chip U19 outputs identical from being grounding to the spiking of output;
The input of the end connection DC/DC conversion chip U19 of electrochemical capacitor E12 (+VI), other end ground connection; Earth terminal (GND) ground connection of DC/DC conversion chip U19;
Switching regulator U20 receives the 12V direct voltage and exports the 5V direct voltage; The ON/OFF port ground connection of switching regulator U20.
The negative pole of Transient Suppression Diode D9 connects the input (Vin) of switching regulator, plus earth; Transient Suppression Diode D9 parallel connection electrochemical capacitor E15 and capacitor C 39;
The negative pole of sustained diode 10 connects the output (Vout) of switching regulator U20, plus earth;
One end of inductance L 6 connects the output (Vout) of switching regulator U20, and the other end is through electrochemical capacitor E16 parallel with one another and capacitor C 40 ground connection.
In the present embodiment, specifically, load circuit 100 comprises electrochemical capacitor E10 parallel with one another and resistance R 3, and electrochemical capacitor E13 parallel with one another and resistance R 36, wherein:
The two ends of the branch roads that 3 parallel connections of electrochemical capacitor E10 and resistance R form be connected respectively DC/DC conversion chip U19 positive output (+VO) with output ground (GNDO);
The two ends of the said electrochemical capacitor E13 branch road that 36 parallel connections form with resistance R are connected the negative output of said DC/DC conversion chip respectively (VO) with output ground (GNDO).
In the present embodiment; Specifically; Anti-emi filter 200 comprises and connects DC/DC conversion chip U19 two outputs (± VO) common mode inductance L3; And the electrochemical capacitor E11 and the electrochemical capacitor E14 that connect common mode inductance L 3 respectively, electrochemical capacitor E11 all is connected simulation ground (AGND) with the electrochemical capacitor E14 other end separately.
In the present embodiment; The model that DC/DC conversion chip U19 selects for use is I A1205, and input voltage is 12V, can tolerate ± variation of 10% input voltage; Output voltage is ± 5V; Voltage stability is ± 5%, and output current is 150mA to the maximum, and each can export the rated power of 0.75W to that is to say 5V and-5V.Switching regulator U20 selects step down switching voltage regulator LM2576 for use, and the allowed band of the input voltage of LM2576 is very big, can change between the 40V at 7V.Output voltage is 5V, and maximum can be exported the 3A electric current, and promptly LM2576 can provide the power of 5V * 3A=15W.
In sum; The utility model converts the 12V direct voltage respectively into ± 5V direct voltage and 5V direct voltage; Wherein ± and the 5V direct voltage is first, second amplifying circuit 12,22 and display screen 27 power supplies in " a kind of MOA current in resistance property detection system ", power supply provides the basis to the 5V direct voltage to miscellaneous part for next step.
Above embodiment only supplies to explain the usefulness of the utility model; But not to the restriction of the utility model; The technical staff in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, should be limited each claim.
Claims (6)
1. the second level power circuit that is used for a kind of MOA current in resistance property detection system; Said MOA current in resistance property detection system comprises CVT monitor cartridge and MOA monitor cartridge; Said CVT monitor cartridge comprises first protective circuit; First microprocessor; First amplifying circuit; The one GPS module; First wireless communication module and a Flash memory; Said MOA monitor cartridge comprises second protective circuit; Second microprocessor; Second amplifying circuit; The 2nd GPS module; Second wireless communication module; The 2nd Flash memory; Keyboard and display screen
Said second level power circuit connects a first order power circuit, and this first order power circuit changes the 220V alternating voltage of electrical network the 12V direct voltage into and flows to said second level power circuit,
It is characterized in that said second level power circuit comprises DC/DC conversion chip, load circuit and the anti-emi filter that connects successively, also comprises switching regulator and Transient Suppression Diode, wherein:
Said DC/DC conversion chip receives said 12V direct voltage and output ± 5V direct voltage, this ± the 5V direct voltage passes through said load circuit and anti-emi filter successively;
Said switching regulator receives said 12V direct voltage and exports the 5V direct voltage;
The negative pole of said Transient Suppression Diode connects the input of said switching regulator, plus earth.
2. the second level power circuit that is used for a kind of MOA current in resistance property detection system according to claim 1; It is characterized in that; Said load circuit comprises electrochemical capacitor E10 parallel with one another and resistance R 3, and electrochemical capacitor E13 parallel with one another and resistance R 36, wherein:
The two ends of the said electrochemical capacitor E10 branch road that 3 parallel connections form with resistance R are connected the positive output and output ground of said DC/DC conversion chip respectively;
The two ends of the said electrochemical capacitor E13 branch road that 36 parallel connections form with resistance R are connected the negative output and output ground of said DC/DC conversion chip respectively.
3. the second level power circuit that is used for a kind of MOA current in resistance property detection system according to claim 1 and 2; It is characterized in that; Said anti-emi filter comprises the common mode inductance L3 that connects said DC/DC conversion chip two outputs, and the electrochemical capacitor E11 and the electrochemical capacitor E14 that connect common mode inductance L3 respectively.
4. the second level power circuit that is used for a kind of MOA current in resistance property detection system according to claim 1 is characterized in that, the input of said DC/DC conversion chip connects electrochemical capacitor E12, the other end ground connection of this electrochemical capacitor E12.
5. the second level power circuit that is used for a kind of MOA current in resistance property detection system according to claim 1 is characterized in that, said Transient Suppression Diode parallel connection electrochemical capacitor E15 and capacitor C 39.
6. according to claim 1 or the 5 described second level power circuits that are used for a kind of MOA current in resistance property detection system, it is characterized in that said switching regulator output connects a fly-wheel diode and an inductance respectively, wherein:
The negative pole of said fly-wheel diode connects the output of said switching regulator, plus earth;
Said inductance is through electrochemical capacitor E16 parallel with one another and capacitor C 40 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201135197U CN202535264U (en) | 2012-03-22 | 2012-03-22 | Second-stage power supply circuit used for MOA resistive current detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201135197U CN202535264U (en) | 2012-03-22 | 2012-03-22 | Second-stage power supply circuit used for MOA resistive current detection system |
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| CN202535264U true CN202535264U (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201135197U Expired - Fee Related CN202535264U (en) | 2012-03-22 | 2012-03-22 | Second-stage power supply circuit used for MOA resistive current detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594125A (en) * | 2012-03-22 | 2012-07-18 | 上海市电力公司 | Secondary power supply circuit for MOA resistive current detecting system |
| CN108063540A (en) * | 2018-01-02 | 2018-05-22 | 清华大学 | Separate excitation starts the cascade submodule power-supply system of self-excitation power supply |
| CN108259306A (en) * | 2018-02-02 | 2018-07-06 | 浙江海康科技有限公司 | 2.4G wireless bridge devices and its in bad electromagnetic field environment moderate resistance electromagnetic interference system |
-
2012
- 2012-03-22 CN CN2012201135197U patent/CN202535264U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594125A (en) * | 2012-03-22 | 2012-07-18 | 上海市电力公司 | Secondary power supply circuit for MOA resistive current detecting system |
| CN108063540A (en) * | 2018-01-02 | 2018-05-22 | 清华大学 | Separate excitation starts the cascade submodule power-supply system of self-excitation power supply |
| CN108063540B (en) * | 2018-01-02 | 2024-02-02 | 清华大学 | Separately excited starting self-excited power supply cascading submodule power supply system |
| CN108259306A (en) * | 2018-02-02 | 2018-07-06 | 浙江海康科技有限公司 | 2.4G wireless bridge devices and its in bad electromagnetic field environment moderate resistance electromagnetic interference system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20200322 |
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| CF01 | Termination of patent right due to non-payment of annual fee |