CN205408260U - Short -circuit protection circuit based on low frequency square wave electronic ballast - Google Patents
Short -circuit protection circuit based on low frequency square wave electronic ballast Download PDFInfo
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- CN205408260U CN205408260U CN201620131378.XU CN201620131378U CN205408260U CN 205408260 U CN205408260 U CN 205408260U CN 201620131378 U CN201620131378 U CN 201620131378U CN 205408260 U CN205408260 U CN 205408260U
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Abstract
The utility model discloses a short -circuit protection circuit based on low frequency square wave electronic ballast, it includes rectification filter circuit, PFC circuit, BUCK circuit, full -bridge circuit, ignition output circuit, MCU control circuit and metal halogen lamp, wherein rectification filter circuit inserts the power, its output with PFC circuit connection exports first DC voltage, this first DC voltage process produce the second DC voltage after the BUCK circuit steps down, this second DC voltage under MCU control circuit's control, through the full -bridge circuit produces two way square wave voltage, the full -bridge circuit with ignition output circuit connects, ignition output circuit with the metal halogen lamp is connected. The circuit adopts the segmentation starting mode, protects in the time of can be to its short circuit to effectively avoid starting the production that the phenomenon was protected to the mistake.
Description
Technical field
This utility model belongs to electrical lighting and learns a skill field, particularly relates to a kind of short-circuit protection circuit based on low-frequency electronic rectifier with squre wave.
Background technology
Metal halogen lamp (MetalHalideLamp) is alternating current power supply work, producing the discharge lamp that arc discharge is luminous in the halogenide mixed vapour of hydrargyrum and rare metal, metal halide lamp is to add the third generation light source that various metal halide is made on high voltage mercury lamp basis.Illumination adopts scandium sodium form metal halide lamp, this light fixture has the features such as luminous efficiency height, good, the life-span length of color developing, it is a kind of energy-conservation new light sources close to color of sunshine, is widely used in the room lighting in the places such as stadiums, exhibition center, megastore, industrial premises, square, street, station, harbour.The negative resistance charactertistic intrinsic due to Metal halogen lamp and special startup requirement, must be used in conjunction with matched ballast, electric ballast has lot of advantages compared with traditional inductance type ballast, electric ballast efficiency is high, self energy consumption only several watts, belongs to energy-conserving product, secondly, having significantly high power factor, electric ballast power factor is easily done more than 0.95, is effectively improved the utilization rate of electric power system and electrical network.But electronic product wiring harness insulation be damaged, load short circuits, wiring error time, all will produce short trouble.The transient fault electric current produced during short circuit is tens to tens times of rated current.Electronic product is likely to damage, produce electric arc because of the powerful electric power that short circuit current produces, and even causes fire, and electric ballast is no exception.But when output loading is Metal halogen lamp, the input voltage of its full load is generally about 110V.Needing high-tension ignition when starting, input voltage is at 3～5KV, and this is accomplished by very big moment input current.And the short-circuit protection mode of routine, when electric current reaches the short-circuit protection point of circuit, circuit will start short-circuit protection, makes Metal halogen lamp be protected in ignition process by mistake, it is impossible to starts, and also just cannot be carried out short-circuit protection.
Therefore, utility model people of the present utility model needs a kind of new technique of design badly to improve its problem.
Utility model content
This utility model aims to provide a kind of short-circuit protection circuit based on low-frequency electronic rectifier with squre wave, it is possible to protects during to its short circuit, and is prevented effectively from the generation starting protection phenomenon by mistake.
For solving above-mentioned technical problem, the technical solution of the utility model is:
A kind of short-circuit protection circuit based on low-frequency electronic rectifier with squre wave, including: current rectifying and wave filtering circuit, pfc circuit, BUCK circuit, full-bridge circuit, igniting output circuit, MCU control circuit and Metal halogen lamp；Wherein said current rectifying and wave filtering circuit accesses power supply, and its outfan is connected with described pfc circuit, exports the first DC voltage；This first DC voltage produces the second DC voltage after described BUCK circuit blood pressure lowering, and this second DC voltage, under the control of MCU control circuit, produces two-way square-wave voltage by described full-bridge circuit；Described full-bridge circuit is connected with described igniting output circuit, and described igniting output circuit is connected with described Metal halogen lamp.
Preferably, described BUCK circuit includes the 3rd chip, electric capacity C20, electric capacity C17, electric capacity C18, electric capacity C25, transformator T2, diode D12, diode D13, resistance R9, resistance R18, resistance R26, resistance R69, resistance R45, resistance R25, resistance R1, resistance R49；Wherein said electric capacity C20, electric capacity C17, electric capacity C18 three parallel connection, its one end is connected with described pfc circuit, the other end is connected with the 3rd foot of described transformator T2, and the 4th foot of described transformator T2 is connected with the positive pole of described diode D12 by after described electric capacity C25；The negative pole of described diode D12 is connected with the first pin of described 3rd chip, and the positive pole of described diode D12 is connected with described MCU control circuit and described full-bridge circuit after passing sequentially through described resistance R26, resistance R18, resistance R9；The positive pole of described diode D12 is connected with described MCU control circuit after passing sequentially through described resistance R45, resistance R25, resistance R1；The negative pole of described diode D13 is connected with the first pin of described 3rd chip, and its positive pole is connected with described MCU control circuit after being connected with described resistance R69；8th pin of described 3rd chip is by being connected with described MCU control circuit after resistance R49.
Preferably, described MCU control circuit includes fifth chip, and the second pin of described fifth chip is connected with described resistance R69, and the 18th pin of described fifth chip is connected with described resistance R1；13rd pin of described fifth chip is connected with described resistance R9 by after resistance R75, resistance R71, resistance R70, resistance R60；The colelctor electrode of audion Q1 is connected with described resistance R49, and its emitter stage is connected with the first pin of described fifth chip after being connected with resistance R64；16th pin of described fifth chip is connected with described full-bridge circuit.
Preferably, described igniting output circuit includes electric capacity C13, electric capacity C51, electric capacity C62, diode D8, inductance L6, transformator T1, inductance L2, inductance LR, wherein said electric capacity C51 is in parallel with described electric capacity C62, the two one end exports square wave with the first via of described full-bridge circuit and is connected, and the other end is connected with the second tunnel output square wave of described full-bridge circuit；Described electric capacity C13 one end is connected with the second tunnel output square wave of described full-bridge circuit, connect with described inductance L6 in one end, described inductance L6 is connected with described diode D8, and the tenth foot of described diode D8 and described transformator T1 is connected, and the 3rd foot of described transformator T1 is connected with described inductance L2；5th foot of described transformator T1 is connected with described inductance LR.
Preferably, described first DC voltage is 10V.
Preferably, described second DC voltage is 410V.
Preferably, described Metal halogen lamp is ceramic gold-halogen lamp.
Adopting technique scheme, this utility model at least includes following beneficial effect:
Short-circuit protection circuit based on low-frequency electronic rectifier with squre wave described in the utility model, circuit adopts segmentation Starting mode, namely first passes through MUC and allows BUCK output voltage be about 100V, and at this moment lower than the breakdown voltage of bilateral diode, load will not produce high-tension ignition.MCU detects BUCK voltage simultaneously, if short circuit, BUCK circuit voltage can lower than 10V, it is judged that short circuit, starts short-circuit protection.If voltage is about 100V, circuit is working properly, BUCK circuit output more than 300V after 1 second, higher than the breakdown voltage of bilateral diode, circuit ignition trigger, so can be avoided startup protection by mistake.
Accompanying drawing explanation
Fig. 1 is the structural representation of the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave described in the utility model；
Fig. 2 is the circuit diagram of pfc circuit described in the utility model；
Fig. 3 is the circuit diagram of BUCK circuit described in the utility model；
Fig. 4 is the circuit diagram of full-bridge circuit described in the utility model；
Fig. 5 is the circuit diagram of MCU control circuit described in the utility model；
Fig. 6 is the circuit diagram of igniting output circuit described in the utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
As shown in Figures 1 to 6, for meeting a kind of short-circuit protection circuit based on low-frequency electronic rectifier with squre wave of the present utility model, including: current rectifying and wave filtering circuit, pfc circuit, BUCK circuit, full-bridge circuit, igniting output circuit, MCU control circuit and Metal halogen lamp；Wherein said current rectifying and wave filtering circuit accesses power supply, and its outfan is connected with described pfc circuit, exports the first DC voltage；This first DC voltage produces the second DC voltage after described BUCK circuit blood pressure lowering, and this second DC voltage, under the control of MCU control circuit, produces two-way square-wave voltage by described full-bridge circuit；Described full-bridge circuit is connected with described igniting output circuit, and described igniting output circuit is connected with described Metal halogen lamp.
Preferably, described BUCK circuit includes the 3rd chip, electric capacity C20, electric capacity C17, electric capacity C18, electric capacity C25, transformator T2, diode D12, diode D13, resistance R9, resistance R18, resistance R26, resistance R69, resistance R45, resistance R25, resistance R1, resistance R49；Wherein said electric capacity C20, electric capacity C17, electric capacity C18 three parallel connection, its one end is connected with described pfc circuit, the other end is connected with the 3rd foot of described transformator T2, and the 4th foot of described transformator T2 is connected with the positive pole of described diode D12 by after described electric capacity C25；The negative pole of described diode D12 is connected with the first pin of described 3rd chip, and the positive pole of described diode D12 is connected with described MCU control circuit and described full-bridge circuit after passing sequentially through described resistance R26, resistance R18, resistance R9；The positive pole of described diode D12 is connected with described MCU control circuit after passing sequentially through described resistance R45, resistance R25, resistance R1；The negative pole of described diode D13 is connected with the first pin of described 3rd chip, and its positive pole is connected with described MCU control circuit after being connected with described resistance R69；8th pin of described 3rd chip is by being connected with described MCU control circuit after resistance R49.
Preferably, described MCU control circuit includes fifth chip, and the second pin of described fifth chip is connected with described resistance R69, and the 18th pin of described fifth chip is connected with described resistance R1；13rd pin of described fifth chip is connected with described resistance R9 by after resistance R75, resistance R71, resistance R70, resistance R60；The colelctor electrode of audion Q1 is connected with described resistance R49, and its emitter stage is connected with the first pin of described fifth chip after being connected with resistance R64；16th pin of described fifth chip is connected with described full-bridge circuit.
Preferably, described igniting output circuit includes electric capacity C13, electric capacity C51, electric capacity C62, diode D8, inductance L6, transformator T1, inductance L2, inductance LR, wherein said electric capacity C51 is in parallel with described electric capacity C62, the two one end exports square wave with the first via of described full-bridge circuit and is connected, and the other end is connected with the second tunnel output square wave of described full-bridge circuit；Described electric capacity C13 one end is connected with the second tunnel output square wave of described full-bridge circuit, connect with described inductance L6 in one end, described inductance L6 is connected with described diode D8, and the tenth foot of described diode D8 and described transformator T1 is connected, and the 3rd foot of described transformator T1 is connected with described inductance L2；5th foot of described transformator T1 is connected with described inductance LR.Described diode D8 is bilateral diode HK3100.
Preferably, described first DC voltage is 10V.
Preferably, described second DC voltage is 410V.
Preferably, described Metal halogen lamp is ceramic gold-halogen lamp.
The operation principle of the present embodiment is in that: civil power input produces the DC voltage of about 410V through current rectifying and wave filtering circuit then through pfc circuit (Fig. 2).410V DC voltage, again by BUCK circuit (Fig. 3) blood pressure lowering, produces DC voltage.This DC voltage then through full-bridge circuit (Fig. 4) under the control of MCU control circuit (Fig. 5) grid of full-bridge MOS (MCU control circuit drive) produce square-wave voltage and export from OUT1 and OUT2 two ends.Square-wave voltage is exported by output unit of lighting a fire (Fig. 6), and when its both end voltage reaches the breakdown voltage of bilateral diode, 10 feet of transformator turn on to 12 feet.Again through the transformer coupled high pressure producing 3KV to 5KV to OUTA+ and OUTA-end.The size of the output DC voltage of BUCK circuit is by self feedback and MCU co-controlling.Full-bridge circuit makes BUCK output waveform become the square wave of same amplitude.
The work process of circuit has been adjusted by the present embodiment, and circuit adopts segmentation Starting mode, namely first passes through MUC and allows BUCK output voltage be about 100V, and at this moment lower than the breakdown voltage of bilateral diode, load will not produce high-tension ignition.MCU detects BUCK voltage simultaneously, if short circuit, BUCK circuit voltage can lower than 10V, it is judged that short circuit, starts short-circuit protection.If voltage is about 100V, circuit is working properly, BUCK circuit output more than 300V after 1 second, higher than the breakdown voltage of bilateral diode, circuit ignition trigger, so can be avoided startup protection by mistake.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses this utility model.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein when without departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (7)
1. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave, it is characterised in that including: current rectifying and wave filtering circuit, pfc circuit, BUCK circuit, full-bridge circuit, igniting output circuit, MCU control circuit and Metal halogen lamp；Wherein said current rectifying and wave filtering circuit accesses power supply, and its outfan is connected with described pfc circuit, exports the first DC voltage；This first DC voltage produces the second DC voltage after described BUCK circuit blood pressure lowering, and this second DC voltage, under the control of MCU control circuit, produces two-way square-wave voltage by described full-bridge circuit；Described full-bridge circuit is connected with described igniting output circuit, and described igniting output circuit is connected with described Metal halogen lamp.
2. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave as claimed in claim 1, it is characterised in that: described BUCK circuit includes the 3rd chip, electric capacity C20, electric capacity C17, electric capacity C18, electric capacity C25, transformator T2, diode D12, diode D13, resistance R9, resistance R18, resistance R26, resistance R69, resistance R45, resistance R25, resistance R1, resistance R49；Wherein said electric capacity C20, electric capacity C17, electric capacity C18 three parallel connection, its one end is connected with described pfc circuit, the other end is connected with the 3rd foot of described transformator T2, and the 4th foot of described transformator T2 is connected with the positive pole of described diode D12 by after described electric capacity C25；The negative pole of described diode D12 is connected with the first pin of described 3rd chip, and the positive pole of described diode D12 is connected with described MCU control circuit and described full-bridge circuit after passing sequentially through described resistance R26, resistance R18, resistance R9；The positive pole of described diode D12 is connected with described MCU control circuit after passing sequentially through described resistance R45, resistance R25, resistance R1；The negative pole of described diode D13 is connected with the first pin of described 3rd chip, and its positive pole is connected with described MCU control circuit after being connected with described resistance R69；8th pin of described 3rd chip is by being connected with described MCU control circuit after resistance R49.
3. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave as claimed in claim 2; it is characterized in that: described MCU control circuit includes fifth chip; second pin of described fifth chip is connected with described resistance R69, and the 18th pin of described fifth chip is connected with described resistance R1；13rd pin of described fifth chip is connected with described resistance R9 by after resistance R75, resistance R71, resistance R70, resistance R60；The colelctor electrode of audion Q1 is connected with described resistance R49, and its emitter stage is connected with the first pin of described fifth chip after being connected with resistance R64；16th pin of described fifth chip is connected with described full-bridge circuit.
4. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave as claimed in claim 3; it is characterized in that: described igniting output circuit includes electric capacity C13, electric capacity C51, electric capacity C62, diode D8, inductance L6, transformator T1, inductance L2, inductance LR; wherein said electric capacity C51 is in parallel with described electric capacity C62; the two one end exports square wave with the first via of described full-bridge circuit and is connected, and the other end is connected with the second tunnel output square wave of described full-bridge circuit；Described electric capacity C13 one end is connected with the second tunnel output square wave of described full-bridge circuit, connect with described inductance L6 in one end, described inductance L6 is connected with described diode D8, and the tenth foot of described diode D8 and described transformator T1 is connected, and the 3rd foot of described transformator T1 is connected with described inductance L2；5th foot of described transformator T1 is connected with described inductance LR.
5. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave as claimed in claim 4, it is characterised in that: described first DC voltage is 10V.
6. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave as claimed in claim 5, it is characterised in that: described second DC voltage is 410V.
7. the short-circuit protection circuit based on low-frequency electronic rectifier with squre wave as described in as arbitrary in claim 1-6, it is characterised in that: described Metal halogen lamp is ceramic gold-halogen lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620131378.XU CN205408260U (en) | 2016-02-22 | 2016-02-22 | Short -circuit protection circuit based on low frequency square wave electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620131378.XU CN205408260U (en) | 2016-02-22 | 2016-02-22 | Short -circuit protection circuit based on low frequency square wave electronic ballast |
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| Publication Number | Publication Date |
|---|---|
| CN205408260U true CN205408260U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620131378.XU Withdrawn - After Issue CN205408260U (en) | 2016-02-22 | 2016-02-22 | Short -circuit protection circuit based on low frequency square wave electronic ballast |
Country Status (1)
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| CN (1) | CN205408260U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578694A (en) * | 2016-02-22 | 2016-05-11 | 苏州市纽克斯照明有限公司 | Short-circuit protection circuit based on low-frequency square wave electronic ballast |
| CN107683006A (en) * | 2017-08-23 | 2018-02-09 | 广路智能科技有限公司 | A kind of more staggeredly direct current HID Switching Power Supplies |
-
2016
- 2016-02-22 CN CN201620131378.XU patent/CN205408260U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578694A (en) * | 2016-02-22 | 2016-05-11 | 苏州市纽克斯照明有限公司 | Short-circuit protection circuit based on low-frequency square wave electronic ballast |
| CN105578694B (en) * | 2016-02-22 | 2019-02-22 | 苏州纽克斯电源技术股份有限公司 | A kind of short-circuit protection circuit based on low-frequency electronic rectifier with squre wave |
| CN107683006A (en) * | 2017-08-23 | 2018-02-09 | 广路智能科技有限公司 | A kind of more staggeredly direct current HID Switching Power Supplies |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215000 No. 16, Chunqiu Road, Suzhou, Jiangsu, Xiangcheng District Patentee after: At Suzhou power technology Limited by Share Ltd Address before: 215000 No. 16, Chunqiu Road, Suzhou, Jiangsu, Xiangcheng District Patentee before: Lumlux Lighting (Suzhou) Inc. |
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| CP01 | Change in the name or title of a patent holder | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160727 Effective date of abandoning: 20191126 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160727 Effective date of abandoning: 20191126 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |