CN102175913B - Electricity-getting device of power transformer - Google Patents
Electricity-getting device of power transformer Download PDFInfo
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- CN102175913B CN102175913B CN 201010622432 CN201010622432A CN102175913B CN 102175913 B CN102175913 B CN 102175913B CN 201010622432 CN201010622432 CN 201010622432 CN 201010622432 A CN201010622432 A CN 201010622432A CN 102175913 B CN102175913 B CN 102175913B
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Abstract
The invention relates to an electricity-getting device of a power transformer, which comprises a circuit input end P, a rectifier T1, a direct current power supply VCT, a first capacitor C1, a second capacitor C2, a first diode D1, a voltage-stabilizing diode D2 and a voltage regulator U1 and also comprises a third diode D3, a triode Q1 and a resistor R1, wherein an anode of the third diode D3 is connected with an anode of the direct current power supply VCT while a cathode of the third diode D3 is connected with an anode output end of the rectifier T1; an emitter of the triode Q1 is connected with the anode of the direct current power supply VCT, a collector of the triode Q1 is connected with the anode output end of the rectifier T1 and a base of the triode Q1 is connected with a cathode of the voltage-stabilizing diode D2; an anode of the voltage-stabilizing diode D2 is grounded; and one end of the resistor R1 is connected with the collector of the triode Q1 while the other end of the resistor R1 is connected with the base of the triode Q1. By using the electricity-getting device of the power transformer, the heat generated by a circuit board can be reduced, the product quality is improved and higher safety coefficient is obtained.
Description
Technical field:
The present invention relates to power domain, specifically is a kind of electricity-getting device of power transformer for two zero line electric energy meters.
Background technology:
For electricity theft prevention, a kind of pair of zero line electric energy meter appears at present, and it adopts power transformer to obtain energy to the power supply of table meter from the current circuit induction, like this, even electric energy meter is under the state of disconnected zero line (namely table is counted not making alive, but electric current is arranged), still can work normally and measure.This electric energy meter, power transformer carry out the rectification sampling and export to computation chip by electricity-getting device of power transformer after obtaining energy.Present electricity-getting device of power transformer as shown in Figure 1, it comprises circuit input end P, rectifier T1, direct supply VCT, the first capacitor C 1, the second capacitor C 2, the first diode D1, voltage stabilizing diode D2 and voltage regulator, described circuit input end P connects the input end of rectifier T1, the positive pole of the output terminal of rectifier T1 connects the positive pole of direct supply VCT, the positive pole of one termination direct supply VCT of the first capacitor C 1, other end ground connection, the second capacitor C 2 and the first Capacitance parallel connection, the plus earth of voltage stabilizing diode D2, negative pole connects the positive pole of direct supply VCT, the positive pole of the first diode D1 connects the positive pole of direct supply VCT, negative pole connects the input end of voltage regulator U1, the output terminal connection circuit output terminal VCC of voltage regulator U1, VCC can be connected with computation chip.
Because, electric energy meter is in the lower time of state of disconnected zero line, electric current is very large, like this, the energy of the secondary output of power transformer increases along with the increase of electric current, the energy that is power input mutual inductor power-supply circuit is very large, adopt above-mentioned electricity-getting device of power transformer, most energy consumption is on voltage stabilizing diode D2, and the junction temperature coefficient of diode is higher, and the energy of loss on voltage stabilizing diode D2 can make the temperature of voltage stabilizing diode D2 sharply rise, thereby cause wiring board seriously to generate heat, affect product quality, have larger potential safety hazard, safety coefficient is lower.
Summary of the invention:
The technical problem to be solved in the present invention is, overcomes the defective of prior art, and a kind of reduction wiring board heating is provided, and improves the quality of products the electricity-getting device of power transformer that safety coefficient is higher.
Technical solution of the present invention is, a kind of electricity-getting device of power transformer is provided, it comprises circuit input end P, rectifier T1, direct supply VCT, the first capacitor C 1, the second capacitor C 2, the first diode D1, voltage stabilizing diode D2 and voltage regulator U1, described circuit input end P connects the input end of rectifier T1, the positive pole of one termination direct supply VCT of the first capacitor C 1, other end ground connection, the second capacitor C 2 is in parallel with the first capacitor C 1, the positive pole of the first diode D1 connects the positive pole of direct supply VCT, negative pole connects the input end of voltage regulator U1, the output terminal connection circuit output terminal VCC of voltage regulator U1, it also comprises the 3rd diode D3, triode Q1 and resistance R 1, the positive pole of described the 3rd diode D3 connects the positive pole of direct supply VCT, negative pole connects the cathode output end of rectifier T1, the emitter of described triode Q1 connects the positive pole of direct supply VCT, collector connects the cathode output end of rectifier T1, base stage connects the negative pole of voltage stabilizing diode D2, the plus earth of voltage stabilizing diode D2, the collector of one termination triode Q1 of described resistance R 1, the base stage of another termination triode Q1 of resistance R 1.
After adopting said structure, the present invention has the following advantages:
Electricity-getting device of power transformer of the present invention has increased node temperature coefficient lower triode and has shared energy on the voltage stabilizing diode, and can pass through the parameter of the peripheral circuit of the triodes such as adjusting resistance, the 3rd diode, make most of the consumption on triode of energy of power-supply circuit, and because the junction temperature coefficient of triode is much lower, therefore can reach the purpose of cooling, thereby improved product quality, increased safety coefficient.
Description of drawings:
Accompanying drawing 1 is the circuit theory diagrams of electricity-getting device of power transformer in the prior art;
Accompanying drawing 2 is circuit theory diagrams of electricity-getting device of power transformer of the present invention;
Embodiment:
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
As shown in Figure 2, the invention provides a kind of electricity-getting device of power transformer, it comprises circuit input end P, rectifier T1, direct supply VCT, the first capacitor C 1, the second capacitor C 2, the first diode D1, voltage stabilizing diode D2 and voltage regulator U1, described circuit input end P connects the input end of rectifier T1, the positive pole of one termination direct supply VCT of the first capacitor C 1, other end ground connection, the second capacitor C 2 is in parallel with the first capacitor C 1, the positive pole of the first diode D1 connects the positive pole of direct supply VCT, negative pole connects the input end of voltage regulator U1, the output terminal connection circuit output terminal VCC of voltage regulator U1, it also comprises the 3rd diode D3, triode Q1 and resistance R 1, the positive pole of described the 3rd diode D3 connects the positive pole of direct supply VCT, negative pole connects the cathode output end of rectifier T1, the emitter of described triode Q1 connects the positive pole of direct supply VCT, collector connects the cathode output end of rectifier T1, base stage connects the negative pole of voltage stabilizing diode D2, the plus earth of voltage stabilizing diode D2, the collector of one termination triode Q1 of described resistance R 1, the base stage of another termination triode Q1 of resistance R 1.The model that described voltage regulator U1 adopts is the chip of RH5RL30AA, and described circuit input end P namely is connected with the secondary output end of power transformer, and circuit output end VCC namely is connected with the computation chip of electric energy meter.
Principle of work of the present invention is: can find out from circuit, the main voltage stabilizing element of power-supply circuit changes to triode Q1, after electric current flows out from rectifier T1, major part flows to triode Q1, only has very that fraction flows to voltage stabilizing diode D2, because the junction temperature coefficient of triode Q1 is lower, the model of triode is ST8050D in the present embodiment, its junction temperature coefficient is 40 ℃/W, and namely triode consumes 1W power, and self temperature rises 40 ℃.And the model that voltage stabilizing diode D2 adopts is 1N4742, and its junction temperature coefficient is asked 170 ℃/W because most of current direction triode Q1, therefore, with respect to before, heating effect is improved greatly, has played the effect of cooling.
Certainly; above-mentioned explanation is not to be limit value to essential scope of the present invention; the present invention also is not limited in above-mentioned giving an example, and the variation that those skilled in the art person has done in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (1)
1. electricity-getting device of power transformer, it comprises circuit input end P, rectifier T1, direct supply VCT, the first capacitor C 1, the second capacitor C 2, the first diode D1, voltage stabilizing diode D2 and voltage regulator U1, described circuit input end P connects the input end of rectifier T1, the positive pole of one termination direct supply VCT of the first capacitor C 1, other end ground connection, the second capacitor C 2 is in parallel with the first capacitor C 1, the positive pole of the first diode D1 connects the positive pole of direct supply VCT, negative pole connects the input end of voltage regulator U1, the output terminal connection circuit output terminal VCC of voltage regulator U1, it is characterized in that: it also comprises the 3rd diode D3, triode Q1 and resistance R 1, the positive pole of described the 3rd diode D3 connects the positive pole of direct supply VCT, negative pole connects the cathode output end of rectifier T1, the emitter of described triode Q1 connects the positive pole of direct supply VCT, collector connects the cathode output end of rectifier T1, base stage connects the negative pole of voltage stabilizing diode D2, the plus earth of voltage stabilizing diode D2, the collector of one termination triode Q1 of described resistance R 1, the base stage of another termination triode Q1 of resistance R 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010622432 CN102175913B (en) | 2010-12-30 | 2010-12-30 | Electricity-getting device of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010622432 CN102175913B (en) | 2010-12-30 | 2010-12-30 | Electricity-getting device of power transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102175913A CN102175913A (en) | 2011-09-07 |
| CN102175913B true CN102175913B (en) | 2013-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010622432 Active CN102175913B (en) | 2010-12-30 | 2010-12-30 | Electricity-getting device of power transformer |
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| CN (1) | CN102175913B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201549U (en) * | 1987-05-23 | 1988-11-16 | 乔新明 | Electricity-saving safety type kilowatt-hour meter |
| DE69218647T2 (en) * | 1991-01-30 | 1997-07-10 | Circuit Breaker Ind | Stabilized voltage source circuit |
| CN2445331Y (en) * | 2000-08-08 | 2001-08-29 | 张洪羿 | Actual effect kilo-watt-hour meter box for avoiding electric burglar |
| CN201904731U (en) * | 2010-12-30 | 2011-07-20 | 宁波三星电气股份有限公司 | Power-supply circuit for power transformer |
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2010
- 2010-12-30 CN CN 201010622432 patent/CN102175913B/en active Active
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| CN102175913A (en) | 2011-09-07 |
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Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo Sanxing Electric Co., Ltd. |
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Effective date of registration: 20210809 Address after: No.16 Fengwan Road, Cicheng Town, Jiangbei District, Ningbo City, Zhejiang Province Patentee after: NINGBO SANXING SMART ELECTRIC Co.,Ltd. Address before: 315191 Yinzhou Industrial Park, Ningbo City, Zhejiang Province (Jiangshan Town, Yinzhou District, Ningbo City) Patentee before: NINGBO SANXING ELECTRIC Co.,Ltd. |
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