CN101232171A - Television power supply protective circuit - Google Patents
Television power supply protective circuit Download PDFInfo
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- CN101232171A CN101232171A CNA200710013097XA CN200710013097A CN101232171A CN 101232171 A CN101232171 A CN 101232171A CN A200710013097X A CNA200710013097X A CN A200710013097XA CN 200710013097 A CN200710013097 A CN 200710013097A CN 101232171 A CN101232171 A CN 101232171A
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- 230000001681 protective effect Effects 0.000 title claims description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 24
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
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Abstract
The invention provides a technical proposal of a TV power protection circuit, which comprises a power input voltage Vac transmitted to a first diode D1 and rectified thereby, a filter capacitor C1 for filtering the power input voltage, and a power first chip N1 and a power second chip N2. The proposal is characterized in that an input detection control circuit is serially connected between the negative terminal of the first diode D1 and the power first chip N1, the input detection control shares a power supply voltage Vin with the power first chip N1 and outputs a power supply voltage Vcc under the control of the power first chip N1, the power second chip N2 is supplied with the power supply voltage Vcc and outputs a feedback voltage Vpfc through a control power circuit, the power second chip N2 is connected with a feedback detection circuit, and the feedback detection circuit is connected with the input detection control circuit and the feedback voltage Vpfc.
Description
Technical field:
What the present invention relates to is a kind of used as television protective circuit, especially a kind of television power supply protective circuit.
Background technology:
In the prior art; technique known is that disclosed No. 97214321.1 patents are authorized by State Intellectual Property Office; this patent disclosure a kind of TV set power protector, this power supply protector can prevent to cause when TV set circuit is short-circuited that television set burns the generation with fire.Under-voltage and overvoltage crowbar for the LCD TV power supply is not still found so far; because liquid crystal television power supply does not have under-voltage and overvoltage protection; when reducing, input voltage to guarantee that power output will strengthen operating current; this just very easily burns the device of circuit front-end; and when AC dump, power management chip is within a certain period of time still in work; cause the bounce-back of liquid crystal display screen supply power voltage, make liquid crystal display screen screen flicker occur.When feedback circuit goes wrong, can make the output voltage of feedback surpass its set point, then can cause rear end part to work or to damage, this is the existing in prior technology weak point.
Summary of the invention:
Purpose of the present invention is exactly at the existing in prior technology deficiency, and provide a kind of television power supply protective circuit technical scheme, this scheme is to adopt power input voltage Vac after rectification to the under-voltage protection of power supply input, enter input and detect control circuit, after input detection control circuit detects power input voltage, removing to control power supply control chip is power supply chip N1, when detecting control circuit detection power input voltage, input is higher than set point, input detects control circuit control power supply chip operate as normal, and the control input detects control circuit out-put supply supply power voltage Vcc; When detecting control circuit detection power input voltage, input is lower than set point, input detection control circuit control power supply chip is closed immediately and is quit work, and the control input detects not out-put supply supply power voltage Vcc of control circuit, this just can be avoided burning the device of circuit front-end, and, power management chip is no longer worked, and the liquid crystal display screen supply power voltage can not rebound, and screen flicker occurs thereby eliminated liquid crystal display screen.The power supply output over-voltage protection employing of this scheme is stablized feedback voltage V pfc and is realized; feedback voltage V pfc removes to control the power supply chip N2 that generates feedback voltage by feedback sense circuit; when feedback voltage is higher than set point; feedback sense circuit work; and be defeated by chip N2 signal and make chip N2 realize overcurrent protection; prevent that feedback voltage from continuing to raise, reach the purpose of overvoltage protection.
This programme is realized by following technical measures: include power input voltage Vac be defeated by the first diode D1 after rectification by filter capacitor C1 filtering, and power supply first chip N1 and the power supply second chip N2, the characteristics of this programme are to be serially connected with input to detect control circuit 1 between the negative terminal of the first diode D1 and the power supply first chip N1, described input detects control circuit 1 has common supply power voltage Vin with the power supply first chip N1, input simultaneously detects control circuit 1 under the control of the power supply first chip N1, out-put supply supply power voltage Vcc, supply power voltage Vcc gives power supply second chip N2 power supply again, the power supply second chip N2 is by control power circuit output feedback voltage V pfc, the power supply second chip N2 connects feedback sense circuit 2 again, and feedback sense circuit 2 connects input again and detects control circuit 1 and feedback voltage V pfc.The concrete characteristics of this programme also have, described input detects control circuit 1, negative terminal at the first diode D1 connects first voltage stabilizing didoe ZD1 of series opposing and 8 pin that first resistance R 1 meets the power supply first chip N1, second resistance R 2 that series connection is arranged at the contact of the first voltage stabilizing didoe ZD1 anode and first resistance R 1, the 3rd resistance R 3 and the 8th resistance R 8 ground connection, be connected with the reverse second diode D2 of series connection and the base stage that the 4th resistance R 4 meets the first triode Q1 at the contact place of second resistance R 2 and the 3rd resistance R 3, the base stage of the first triode Q1 meets supply power voltage Vin through the 5th resistance R 5, the emitter of the first triode Q1 also meets supply power voltage Vin, supply power voltage Vin connects 6 pin of the power supply first chip N1 simultaneously, be connected with reverse the 3rd diode D3 of series connection at the contact place of the 3rd resistance R 3 and the 8th resistance R 8, the 7th resistance R 7 and the 13 resistance R 13 connect the base stage of the 3rd triode Q3, the base stage of the 3rd triode Q3 meets supply power voltage Vin through the 14 resistance R 14 again, the collector electrode of the 3rd triode Q3 also meets supply power voltage Vin through the 15 resistance R 15, the emitter of the 3rd triode Q3 is out-put supply supply power voltage Vcc then, the base stage of the 3rd triode Q3 is again through reverse the 3rd voltage stabilizing didoe ZD3 ground connection, the base stage of the 3rd triode Q3 connects the emitter of the second triode Q2 again simultaneously, the grounded collector of the second triode Q2, the base stage of the second triode Q2 then connect the contact of the 7th resistance R 7 and the 13 resistance R 13.Described feedback sense circuit 2 is, detect the 8th resistance R 8 of control circuit 1 in input, the contact place of the 3rd resistance R 3 and the 3rd diode D3 negative terminal connects the collector electrode of the 4th triode Q4, the emitter of the 4th triode Q4 connects 4 pin of second source chip N2 through the 9th resistance R 9, the emitter of the 4th triode Q4 connects the base stage of self simultaneously through the tenth resistance R 10, the base stage of the 4th triode Q4 meets feedback voltage V pfc through the forward second voltage stabilizing didoe ZD2 and the 11 resistance R 11 of series connection again, and the contact of the second voltage stabilizing didoe ZD2 negative terminal and the 11 resistance R 11 is again through the 12 resistance R 12 ground connection.
The beneficial effect of this programme can be learnt according to the narration to such scheme, detect control circuit owing in this scheme, be serially connected with input between the negative terminal of diode D1 and the power supply chip N1, described input detects control circuit and power supply chip N1 has common supply power voltage Vin, input simultaneously detects control circuit under the control of power supply chip N1, out-put supply supply power voltage Vcc, supply power voltage Vcc gives power supply chip N2 power supply again, power supply chip N2 is by control power circuit output feedback voltage V pfc, power supply chip N2 connects feedback sense circuit again, and feedback sense circuit connects input again and detects control circuit and feedback voltage V pfc.This structure, to the under-voltage protection of power supply input is to adopt power input voltage Vac after rectification, enter input and detect control circuit, after input detection control circuit detects power input voltage, removing to control power supply control chip is power supply chip N1, be higher than set point when input detects control circuit detection power input voltage, input detects control circuit control power supply chip operate as normal, and control input is detected control circuit out-put supply supply power voltage Vcc; When detecting control circuit detection power input voltage, input is lower than set point, input detection control circuit control power supply chip is closed immediately and is quit work, and the control input detects not out-put supply supply power voltage Vcc of control circuit, this just can be avoided burning the device of circuit front-end, and, power management chip is no longer worked, and the liquid crystal display screen supply power voltage can not rebound, and screen flicker occurs thereby eliminated liquid crystal display screen.The power supply output over-voltage protection employing of this scheme is stablized feedback voltage V pfc and is realized; feedback voltage V pfc removes to control the power supply chip N2 that generates feedback voltage by feedback sense circuit; when feedback voltage V pfc is higher than set point; feedback sense circuit work; and be defeated by chip N2 signal and make chip N2 realize overcurrent protection; prevent that feedback voltage from continuing to raise, reach the purpose of overvoltage protection.This shows that the present invention compared with prior art has outstanding substantive distinguishing features and obvious improvement, the beneficial effect of its enforcement also is conspicuous.
Description of drawings:
Fig. 1 is the structural representation of the specific embodiment of the invention.
Fig. 2 is the circuit diagram of the specific embodiment of the invention.
Among the figure, 1 for input detects control circuit, and 2 is feedback sense circuit.
Embodiment:
For clearly demonstrating the technical characterstic of this programme,, and, this programme is set forth in conjunction with its accompanying drawing below by an embodiment.
By accompanying drawing Fig. 1 as can be seen; the television power supply protective circuit of this programme; have power input voltage Vac be defeated by the first diode D1 after rectification by filter capacitor C1 filtering; and power supply first chip N1 and the power supply second chip N2; this programme is to be serially connected with input to detect control circuit 1 between the negative terminal of the first diode D1 and the power supply first chip N1; described input detects control circuit 1 has common supply power voltage Vin with the power supply first chip N1; input simultaneously detects control circuit 1 under the control of the power supply first chip N1; out-put supply supply power voltage Vcc; supply power voltage Vcc gives power supply second chip N2 power supply again; the power supply second chip N2 is by control power circuit output feedback voltage V pfc; the power supply second chip N2 connects feedback sense circuit 2 again, and feedback sense circuit 2 connects input again and detects control circuit 1 and feedback voltage V pfc.
By accompanying drawing Fig. 2 as can be seen, described input detects control circuit 1, the first voltage stabilizing didoe ZD1 model that connects series opposing at the negative terminal of the first diode D1 is that to connect the power supply first chip N1 model be 8 pin of NCP1207ADR2G for the 05W33B and first resistance R 1, second resistance R 2 that series connection is arranged at the contact of the first voltage stabilizing didoe ZD1 anode and first resistance R 1, the 3rd resistance R 3 and the 8th resistance R 8 ground connection, be connected with the reverse second diode D2 of series connection and the 4th resistance R 4 to connect the first triode Q1 model be the base stage of MMBT2907ALT1G at the contact place of second resistance R 2 and the 3rd resistance R 3, the base stage of the first triode Q1 meets supply power voltage Vin through the 5th resistance R 5, the emitter of the first triode Q1 also meets supply power voltage Vin, supply power voltage Vin connects 6 pin of the power supply first chip N1 simultaneously, be connected with reverse the 3rd diode D3 of series connection at the contact place of the 3rd resistance R 3 and the 8th resistance R 8, it is the base stage of BCP56-10T1G that the 7th resistance R 7 and the 13 resistance R 13 connect the 3rd triode Q3 model, the base stage of the 3rd triode Q3 meets supply power voltage Vin through the 14 resistance R 14 again, the collector electrode of the 3rd triode Q3 also meets supply power voltage Vin through the 15 resistance R 15, the emitter of the 3rd triode Q3 is out-put supply supply power voltage Vcc then, the base stage of the 3rd triode Q3 is a MMSZ15T1G ground connection through reverse the 3rd voltage stabilizing didoe ZD3 model again, it is the emitter of MMBT2907ALT1G that the base stage of while the 3rd triode Q3 connects the second triode Q2 model again, the grounded collector of the second triode Q2, the base stage of the second triode Q2 then connect the contact of the 7th resistance R 7 and the 13 resistance R 13.The course of work of this circuit is when power input voltage Vic is higher than set point, voltage stabilizing didoe ZD1 conducting, make power supply chip N1 operate as normal, power supply chip N1 control power circuit generates supply power voltage Vin, the current potential that is higher than supply power voltage Vin simultaneously in resistance R 2 and the contact place generation one of R3, this current potential ends diode D2 and triode Q1, at the junctional potential of resistance R 3 and R8 diode D3 and triode Q2 is ended, and supply power voltage Vin is through triode D3 out-put supply supply power voltage Vcc; When power input voltage Vic is lower than set point, voltage stabilizing didoe ZD1 ends, make power supply chip N1 lose starting current, N1 is locked for the power supply chip of diode D2 and triode Q1 conducting supply power voltage Vin control simultaneously, power supply chip N1 is quit work, at this moment, diode D3 and triode Q2 conducting, triode Q3 is cut off, and power supply power supply Vcc is disconnected.So when input when under-voltage, even also have electric weight on former limit, also can't be transported to secondary, thereby realized under-voltage protection, also eliminated the appearance of screen flicker.
By accompanying drawing Fig. 2 as can be seen, described feedback sense circuit 2 is, detect the 8th resistance R 8 of control circuit 1 in input, it is the collector electrode of MMBT2222ALT1G that the contact place of the 3rd resistance R 3 and the 3rd diode D3 negative terminal connects the 4th triode Q4 model, it is 4 pin of NCP1653ADR2G that the emitter of the 4th triode Q4 connects second source chip N2 model through the 9th resistance R 9, the emitter of the 4th triode Q4 connects the base stage of self simultaneously through the tenth resistance R 10, the base stage of the 4th triode Q4 is that MMSZ15T1G and the 11 resistance R 11 meet feedback voltage V pfc through the forward second voltage stabilizing didoe ZD2 model of series connection again, and the contact of the second voltage stabilizing didoe ZD2 negative terminal and the 11 resistance R 11 is again through the 12 resistance R 12 ground connection.The course of work of this circuit is at feedback voltage V pfc just often; voltage stabilizing didoe ZD2 and triode Q4 end; power supply chip N2 operate as normal; and the control power circuit generates feedback voltage V pfc; but when feedback circuit goes wrong; feedback voltage V pfc exceeds normal range (NR); then voltage stabilizing didoe ZD2 and triode Q4 conducting; a voltage is provided just for the CS end of power supply chip N2; make power supply chip N2 produce overcurrent protection and quit work; this continuation of just having controlled feedback voltage V pfc raises, and starts the purpose of overvoltage protection.
The present invention is not limited in above-mentioned embodiment, and the variation that those of ordinary skills make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (10)
1. television power supply protective circuit; include power input voltage Vac be defeated by the first diode D1 after rectification by filter capacitor C1 filtering; and power supply first chip N1 and the power supply second chip N2; it is characterized in that: between the negative terminal of the first diode D1 and the power supply first chip N1, be serially connected with input and detect control circuit 1; described input detects control circuit 1 has common supply power voltage Vin with the power supply first chip N1; input simultaneously detects control circuit 1 under the control of the power supply first chip N1; out-put supply supply power voltage Vcc; supply power voltage Vcc gives power supply second chip N2 power supply again; the power supply second chip N2 is by control power circuit output feedback voltage V pfc; the power supply second chip N2 connects feedback sense circuit 2 again, and feedback sense circuit 2 connects input again and detects control circuit 1 and feedback voltage V pfc.
2. television power supply protective circuit according to claim 1; it is characterized in that: described input detects control circuit 1 and is; negative terminal at the first diode D1 connects first voltage stabilizing didoe ZD1 of series opposing and 8 pin that first resistance R 1 meets the power supply first chip N1; second resistance R 2 that series connection is arranged at the contact of the first voltage stabilizing didoe ZD1 anode and first resistance R 1; the 3rd resistance R 3 and the 8th resistance R 8 ground connection; be connected with the reverse second diode D2 of series connection and the base stage that the 4th resistance R 4 meets the first triode Q1 at the contact place of second resistance R 2 and the 3rd resistance R 3; the base stage of the first triode Q1 meets supply power voltage Vin through the 5th resistance R 5; the emitter of the first triode Q1 also meets supply power voltage Vin; supply power voltage Vin connects 6 pin of the power supply first chip N1 simultaneously; be connected with reverse the 3rd diode D3 of series connection at the contact place of the 3rd resistance R 3 and the 8th resistance R 8; the 7th resistance R 7 and the 13 resistance R 13 connect the base stage of the 3rd triode Q3; the base stage of the 3rd triode Q3 meets supply power voltage Vin through the 14 resistance R 14 again; the collector electrode of the 3rd triode Q3 also meets supply power voltage Vin through the 15 resistance R 15; the emitter of the 3rd triode Q3 is out-put supply supply power voltage Vcc then; the base stage of the 3rd triode Q3 is again through reverse the 3rd voltage stabilizing didoe ZD3 ground connection; the base stage of the 3rd triode Q3 connects the emitter of the second triode Q2 again simultaneously; the grounded collector of the second triode Q2, the base stage of the second triode Q2 then connect the contact of the 7th resistance R 7 and the 13 resistance R 13.
3. television power supply protective circuit according to claim 1 and 2; it is characterized in that: described feedback sense circuit 2 is; detect the 8th resistance R 8 of control circuit 1 in input; the contact place of the 3rd resistance R 3 and the 3rd diode D3 negative terminal connects the collector electrode of the 4th triode Q4; the emitter of the 4th triode Q4 connects 4 pin of second source chip N2 through the 9th resistance R 9; the emitter of the 4th triode Q4 connects the base stage of self simultaneously through the tenth resistance R 10; the base stage of the 4th triode Q4 meets feedback voltage V pfc through the forward second voltage stabilizing didoe ZD2 and the 11 resistance R 11 of series connection again, and the contact of the second voltage stabilizing didoe ZD2 negative terminal and the 11 resistance R 11 is again through the 12 resistance R 12 ground connection.
4. television power supply protective circuit according to claim 2 is characterized in that: what the described power supply first chip N1 adopted is that model is the chip of NCP1207ADR2G.
5. television power supply protective circuit according to claim 2 is characterized in that: the described first triode Q1 and the second triode Q2 are that the employing model is the triode of MMBT2907ALT1G.
6. television power supply protective circuit according to claim 2 is characterized in that: described the 3rd triode Q3 is that the employing model is the triode of BCP56-10T1G.
7. television power supply protective circuit according to claim 2 is characterized in that: the described first voltage stabilizing didoe ZD1 is that the employing model is the voltage stabilizing didoe of 05W33B.
8. television power supply protective circuit according to claim 3 is characterized in that: described second voltage stabilizing didoe ZD2 and the 3rd voltage stabilizing didoe ZD3 are that the employing model is the voltage stabilizing didoe of MMSZ15T1G.
9. television power supply protective circuit according to claim 3 is characterized in that: the described power supply second chip N2 is that the employing model is the chip of NCP1653ADR2G.
10. television power supply protective circuit according to claim 3 is characterized in that: described the 4th triode Q4 is that the employing model is the triode of MMBT2222ALT1G.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710013097XA CN101232171B (en) | 2007-01-24 | 2007-01-24 | Television power supply protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710013097XA CN101232171B (en) | 2007-01-24 | 2007-01-24 | Television power supply protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101232171A true CN101232171A (en) | 2008-07-30 |
| CN101232171B CN101232171B (en) | 2011-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710013097XA Active CN101232171B (en) | 2007-01-24 | 2007-01-24 | Television power supply protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101232171B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101964511A (en) * | 2010-09-02 | 2011-02-02 | 青岛海信电器股份有限公司 | Overcurrent protection circuit and television |
| CN102355124A (en) * | 2011-09-14 | 2012-02-15 | 华为技术有限公司 | Device for avoiding frequent start stop of photovoltaic inverter and photovoltaic inverter |
| CN101931317B (en) * | 2009-06-24 | 2012-08-15 | 海洋王照明科技股份有限公司 | Power supply start control circuit and power supply |
| CN102709870A (en) * | 2012-06-13 | 2012-10-03 | 青岛海信电器股份有限公司 | Power supply protection circuit and electronic product |
| CN102761104A (en) * | 2011-04-28 | 2012-10-31 | 肖磊 | Power supply protection device of electronic circuit |
| CN104836419A (en) * | 2015-05-25 | 2015-08-12 | 无锡安邦电气有限公司 | Switching power supply driver chip supply circuit with undervoltage detection function |
| CN104961950A (en) * | 2015-06-10 | 2015-10-07 | 南通御丰塑钢包装有限公司 | Packaging material for cotton, and preparation technology thereof |
| CN113991601A (en) * | 2021-11-03 | 2022-01-28 | 西安热工研究院有限公司 | Output voltage short circuit protection circuit structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2041456U (en) * | 1988-08-15 | 1989-07-19 | 陈策沾 | Protector for electric appliances |
| US4999730A (en) * | 1989-05-10 | 1991-03-12 | Pickard Harold W | Line voltage monitor and controller |
| CN2073179U (en) * | 1990-08-09 | 1991-03-13 | 裴作宏 | Multifunction protector for tv and refrigerator |
| KR100828923B1 (en) * | 2001-10-10 | 2008-05-13 | 엘지디스플레이 주식회사 | Prevention Circuit of Over Voltage and Surge Voltage |
| CN2694668Y (en) * | 2004-04-01 | 2005-04-20 | 深圳创维－Rgb电子有限公司 | Power network overvoltage detection and control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101931317B (en) * | 2009-06-24 | 2012-08-15 | 海洋王照明科技股份有限公司 | Power supply start control circuit and power supply |
| CN101964511A (en) * | 2010-09-02 | 2011-02-02 | 青岛海信电器股份有限公司 | Overcurrent protection circuit and television |
| CN101964511B (en) * | 2010-09-02 | 2013-07-24 | 青岛海信电器股份有限公司 | Overcurrent protection circuit and television |
| CN102761104A (en) * | 2011-04-28 | 2012-10-31 | 肖磊 | Power supply protection device of electronic circuit |
| CN102355124A (en) * | 2011-09-14 | 2012-02-15 | 华为技术有限公司 | Device for avoiding frequent start stop of photovoltaic inverter and photovoltaic inverter |
| CN102355124B (en) * | 2011-09-14 | 2014-01-08 | 华为技术有限公司 | Device for avoiding frequent start stop of photovoltaic inverter and photovoltaic inverter |
| CN102709870A (en) * | 2012-06-13 | 2012-10-03 | 青岛海信电器股份有限公司 | Power supply protection circuit and electronic product |
| CN104836419A (en) * | 2015-05-25 | 2015-08-12 | 无锡安邦电气有限公司 | Switching power supply driver chip supply circuit with undervoltage detection function |
| CN104836419B (en) * | 2015-05-25 | 2017-05-31 | 无锡安邦电气有限公司 | Switching Power Supply driving chip power supply circuit with under-voltage detection function |
| CN104961950A (en) * | 2015-06-10 | 2015-10-07 | 南通御丰塑钢包装有限公司 | Packaging material for cotton, and preparation technology thereof |
| CN113991601A (en) * | 2021-11-03 | 2022-01-28 | 西安热工研究院有限公司 | Output voltage short circuit protection circuit structure |
| CN113991601B (en) * | 2021-11-03 | 2024-07-09 | 西安热工研究院有限公司 | Output voltage short circuit protection circuit structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101232171B (en) | 2011-04-20 |
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Address after: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |