CN103491666B - A kind of flasher of power valve protective circuit - Google Patents
A kind of flasher of power valve protective circuit Download PDFInfo
- Publication number
- CN103491666B CN103491666B CN201210555414.1A CN201210555414A CN103491666B CN 103491666 B CN103491666 B CN 103491666B CN 201210555414 A CN201210555414 A CN 201210555414A CN 103491666 B CN103491666 B CN 103491666B
- Authority
- CN
- China
- Prior art keywords
- unit
- power tube
- power
- trigger
- halogen lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
A kind of flasher of power valve protective circuit, it comprises power subsystem, load Halogen lamp LED and controller, wherein: this power subsystem comprises 12V DC power supply storage battery, this load Halogen lamp LED accesses this power subsystem after connecting with described controller, and this controller comprises power tube, sampling unit and control unit, described controller, its positive terminal connects one end of described load Halogen lamp LED, negative pole end connects described power subsystem, can the drain-source current of remote monitoring power tube by controller of the present invention, the conducting of voltage control power tube and cut-off, thus it is high to overcome the integrated difficulty of technique temperature detecting unit and power tube done on the same chip, realize remote protecting power tube, thus ensure that flasher can normally work.
Description
Technical field
The present invention relates to electronic applications, espespecially a kind of flasher of power valve protective circuit.
Background technology
Flasher is made up of controller and power tube two parts, the drain-source On current (such as 20 amperes) of controller power limitation pipe, opening the moment of power tube drain-source conducting, the drain-source current of power tube can close to cut-off current, big current can maintain a hundreds of microsecond, therefore power tube internal temperature can raise rapidly, and particularly in load short circuits situation, this situation is particularly evident.Will power tube be burnt out when power tube internal temperature exceedes its rated value, therefore need to protect power tube not to be burned by number of ways (as temperature protection technology).Power tube is protected at present mainly through the drain-source current of power limitation pipe and the temperature of detection power pipe.
And the working temperature of current detection power pipe mainly contains following two kinds of methods: one is that temperature detecting unit and power tube are done on the same chip; Another kind is that temperature sensor is tried one's best close to power tube with probe power pipe temperature.Due to second method, temperature sensor, close to power tube, with probe power pipe temperature, only when power tube temperature rise speed, comparatively time slack is just effective as far as possible; therefore; when power tube temperature raises rapidly; chip temperature and package temperature inconsistent; even chip conductive raceway groove and chip substrate temperature inconsistent time, this way can not be protected power tube.Therefore, the first temperature detecting unit and power tube do is power tube temperature checking method comparatively conventional at present on the same chip.
But, because this difficulty temperature detecting unit and power tube being done technique on the same chip integrated is high, and the domestic processing line not having power tube (VDMOS) that performance is good and plane process compatible, only select the processing line of the power tube (LDMOS) of poor performance, this reduces properties of product.
In order to the integrated difficulty of technique overcoming VDMOS power tube device for monitoring temperature is high; improve the reliability of power valve protective circuit simultaneously, provide a kind of and the drain-source current of remote monitoring power tube and drain-source voltage can control the flasher of the conducting of power tube and the power valve protective circuit of cut-off.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of can the drain-source current of monitor power pipe, the conducting of voltage control power tube and cut-off, thus the flasher of power valve protective circuit that protection flasher can normally work.
For achieving the above object; the flasher of a kind of power valve protective circuit of the present invention; it comprises power subsystem, load Halogen lamp LED and controller; wherein: this power subsystem comprises 12V DC power supply storage battery; this load Halogen lamp LED accesses this power subsystem after connecting with described controller, and this controller comprises power tube, sampling unit and control unit, described controller; its positive terminal connects one end of described load Halogen lamp LED, and negative pole end connects described power subsystem.
In the preferred version of the present invention, described power tube connects described sampling unit, and in parallel with described control unit, and wherein the drain electrode of this power tube is connected with this power subsystem negative pole, and source electrode is connected with described sampling unit.
In the preferred version of the present invention, described sampling unit comprises current-limiting resistance and two series resistances, and wherein: one end of this current-limiting resistance is connected with power tube, the other end is connected with described power subsystem negative pole end; This two series resistance comprises the second resistance of the first resistance and series connection thereof, described first resistance is connected with the source electrode of this power tube, described second resistance is connected with the drain electrode of described power tube, is connected with described control unit at the intermediate contact place of this first, second resistant series.
In the preferred version of the present invention, described control unit connects described load Halogen lamp LED, is also connected with the grid of described power tube.
In the preferred version of the present invention, described control unit comprises security check unit, oscillator signal unit and signal driving unit.
In the preferred version of the present invention, described control unit, comprises voltage stabilizing reference cell further, and described voltage stabilizing reference cell connects described load Halogen lamp LED and is connected with described safety detection unit, described oscillator signal unit and described signal driving unit.
In the preferred version of the present invention, described security check unit one end connects described current-limiting resistance, and the other end connects this oscillator signal unit.
In the preferred version of the present invention, described security check unit at least comprises a voltage comparator, this voltage comparator output and this oscillator signal unit, also be connected with described signal driving unit, and negative input end is connected with the intermediate contact place of this first, second resistant series described, positive input terminal is connected with described power tube.
In the preferred version of the present invention, described oscillator signal unit determines flicker frequency, clocking function, and the signal processed from described security check unit exports, and this oscillator signal unit comprises the first trigger, the second trigger and the 3rd trigger.
In the preferred version of the present invention, described first trigger, second trigger and the 3rd trigger are series connection mutually, wherein: this first trigger, second trigger is all connected with clock pulse signal with (C) port of the 3rd trigger, (D) end of this first trigger is connected with the output of described voltage comparator, (Q) end of this first trigger is held with (D) of described second trigger and is connected, (Q) end of this second trigger is held with (D) of the 3rd trigger and is connected, and this second trigger is all connected with described signal driving unit with (Q) end of the 3rd trigger.
In the preferred version of the present invention, described signal driving unit output is connected with the grid of described power tube.
Compared with prior art, its beneficial effect is in the present invention:
The present invention is by the drain-source current of remote monitoring power tube, the conducting of voltage control power tube and cut-off; thus the power tube overcome in temperature checking method and temperature detecting module must in the limitations of same chip and same position; realize remote protecting power tube, thus ensure that flasher can normally work.
Accompanying drawing explanation
Fig. 1 is the circuit flow process block schematic diagram of the preferred version of the present invention.
Fig. 2 is the circuit flow process block schematic diagram of another preferred version of the present invention.
Fig. 3 is the circuit diagram of the preferred version of the present invention.
Fig. 4 is the schematic diagram that the power tube in Fig. 3 middle controller is communicated with control unit.
Fig. 5 is the circuit diagram that two series resistances in Fig. 3 middle controller are communicated with control unit.
Fig. 6 is power tube safe voltage time plot in Fig. 4.
Fig. 7 is the volt-time curve figure of power tube load 50 watts in Fig. 4.
Fig. 8 is the volt-time curve figure of power tube short-circuit condition in Fig. 4.
Fig. 9 is the volt-time curve figure of power tube overload in Fig. 4.
Embodiment
By describe in detail the present invention technology contents, structural feature, reached object and effect, hereby exemplify embodiment below and coordinate accompanying drawing to be explained in detail.
Refer to shown in Fig. 1, and combination is consulted shown in Fig. 2 to 5, the invention provides a kind of flasher of power valve protective circuit, it comprises power subsystem 10, load Halogen lamp LED 20 and controller 30, wherein:
This power subsystem 10, comprises storage battery (not shown), adopts 12V DC power supply;
Please combining consults shown in Fig. 3 again, and this load Halogen lamp LED 20 is 50 tile loads, accesses this power subsystem 10 with described controller 30 after connecting;
Please continue to refer to Fig. 1, and combination is consulted shown in Fig. 4, and the positive terminal of this controller 30 connects one end of described load Halogen lamp LED 20, and negative pole end connects described power subsystem 10, and described controller 30 comprises power tube 31, sampling unit 32 and control unit 33, wherein:
Refer to shown in Fig. 1, this power tube 31 connects described sampling unit 32, and in parallel with described control unit 33; In this preferred version, this power tube 31 is controllable switch of described Halogen lamp LED 20, and its drain electrode is connected with the negative pole of this power subsystem 10, and source electrode is connected with described sampling unit 32;
Referring again to Fig. 1, and combination is consulted shown in Fig. 5, described sampling unit 32 can carry out identification sampling to current/voltage, this sampling unit 32 comprises current-limiting resistance 321 and two series resistances 322, wherein: one end of this current-limiting resistance 321 is connected with power tube 31, the other end is connected with described power subsystem 10 negative pole end, thus the effect played restriction and detect by this power tube 31 electric current; This two series resistance 322 comprises the second resistance 3222 of the first resistance 3221 and series connection thereof, described first resistance 3221 is connected with the source electrode of this power tube 31, described second resistance 3222 is connected with the drain electrode of described power tube 31, detect safe voltage value when described power tube works and sampling voltage value by this, be connected with described control unit 33 at the intermediate contact place of first, second resistance 3221,3222 series connection, magnitude of voltage when this detected power tube 31 sampled out by this works is delivered to described control unit 33;
Shown in Fig. 1 and Fig. 5, this control unit 33 is also connected with the grid of described power tube 31 when connecting described load Halogen lamp LED 20, first preferred version of described control unit 33, comprising: security check unit 332, oscillator signal unit 333 and signal driving unit 334, wherein:
Described security check unit 332 comprises voltage comparator 3321, this voltage comparator 3321 in order to detect described power tube 31 normally work time safe current and magnitude of voltage, thus ensure not occur that overload is damaged, in this preferred version, this security check unit 332 one end connects described current-limiting resistance 321, the other end connects this oscillator signal unit 333, this current-limiting resistance 312 can be described security check unit 332 provide by described power tube 31 normally work time safe current magnitude of voltage, equally, this security check unit 332 is under the effect of two series resistances 322, the reference voltage that (-) reverse input end delivering to this security check unit 332 is connected with (+) in-phase input end compares, its comparative result delivers to oscillator signal unit 333 data input pin, such as: the reference voltage that (-) reverse input end delivering to the voltage comparator 3321 in this security check unit 332 when load and (+) in-phase input end connect compares, its comparative result delivers to (D) data input pin of the first trigger 3331 of described oscillator signal unit 333, when load Halogen lamp LED 20 load is 200 watt-hours, this power tube 31 is under the state of conducting current limliting, to described security check unit 332 transmission of signal, its security check unit 332 can detect the leakage of this power tube 31 in real time, source voltage, if the leakage of this power tube 31 of a certain moment, source voltage terminal has exceeded when being stored in power tube 31 internal security voltage described in this, the grid that described security check unit 332 meeting controls described power tube 31 at synchronization ends by it, thus protect this power tube 31.
Shown in Fig. 1 and Fig. 5, described oscillator signal unit 333 has decision flicker frequency, the function of clocking, the signal simultaneously processed from described security check unit 332 exports, this oscillator signal unit 333 comprises the first trigger 3331, second trigger 3332 and the 3rd trigger 3333, in this preferred version, described first trigger 3331, second trigger 3332 and the 3rd trigger 3333 are series connection mutually, and (C) port of this three trigger is all connected with clock pulse signal, wherein: (D) end of described first trigger 3331 is connected with the output of described voltage comparator 3321, (Q) end of described first trigger 3331 is held with (D) of described second trigger 3332 and is connected, (Q) end of described second trigger 3332 is held with (D) of the 3rd trigger 3333 and is connected, and described second trigger 3332 is all connected with described signal driving unit 334 with (Q) end of the 3rd trigger 3333, in this preferred version, described voltage comparator 3321 output is connected with oscillator signal unit 332, also be connected with described signal driving unit 334 with 332, the intermediate contact place that negative input end and this first, second resistance 3221,3222 described of described voltage comparator 3321 are connected is connected, and the positive input terminal of this voltage comparator 3321 is connected with described power tube 31,
The output of described signal driving unit 334 is connected with the grid of described power tube 31, wherein: this power tube 31 safe voltage changes with time during work, temperature, load abnormal, changes as changes such as short circuits.In fact, this signal driving unit 334 receives described oscillator signal unit 333 signal, and its oscillator signal unit 333 receives described security check unit 332 signal, and is finally delivered to described power tube 31 by the signal that each function produces and obtains there is control;
In summary; by the virtual voltage of power tube 31 described in voltage comparator 3321 Real-time Collection in described security check unit 332; and by the virtual voltage in this power tube 31 compared with safe voltage; described oscillator signal unit 333 and described signal driving unit 334 is exported to by comparing gained signal; after described oscillator signal unit 333 and described signal driving unit 334 computing; the operation result utilizing it to obtain, to control the conducting/closedown of described power tube 31, protects this power tube 31.
Referring again to Fig. 2, wherein present the second preferred version of this control unit 33, as this preferred version, this control unit 33 comprises voltage stabilizing reference cell 331 further, this voltage stabilizing reference cell 331 can be described safety check control unit 332 and provides stable operating voltage and reference voltage, described voltage stabilizing reference cell 331 connect described load Halogen lamp LED 20 and with described safety detection unit 332, described oscillator signal unit 333 is connected with described signal driving unit 334, because it is more stable in order to allow power supply supply, the reference power supply with stability that just relative front end is set up in described control unit 33, other electrical principle and circuit access state substantially identical with aforementioned first preferred version, for saving word length, also be convenient to read fast, no longer repeat for this reason.
As preferred version of the present invention, described oscillator signal unit 333 of the present invention at least comprises a trigger, and in order to ensure that operation result is more accurate, described oscillator signal unit 333 is three triggers preferably.
As preferred version of the present invention, described security check unit 332 of the present invention can comprise two and above voltage comparator 3321.
The to sum up flasher of this power valve protective circuit, through experiment: the maximum ON time curve of its power tube under various supply voltage, is called for short the safe voltage time graph of power tube, as power tube V-t curve in Fig. 6; Under light load conditions, referring to shown in Fig. 7, is the voltage time history plot at the drain-source two ends of this power tube, and this curve is always in the below of the safe voltage time graph of power tube, so controller controls power tube conducting always; Under short circuit condition, refer to Fig. 8, the voltage time history plot at the drain-source two ends of this power tube, exceeded the safe voltage of power tube in the voltage U 1 at the drain-source two ends of t1 moment power tube, so controller controls power tube cut-off in the t1 moment; Refer to Fig. 9, it is the voltage time history plot at the drain-source two ends of this power tube under the condition of load overload, the safe voltage of power tube has been exceeded, so controller controls power tube cut-off in the t2 moment in the voltage U 2 at the drain-source two ends of t2 moment power tube;
Power tube V-t curve synoptic diagram under the various states of above in experimentation is known: when load is the Halogen lamp LED of 50 watts, in power tube turn on process, the filament resistance of Halogen lamp LED increases gradually along with the heating of filament, therefore the voltage of filament also increases gradually, and drain-source voltage on power tube reduces gradually along with the heating of filament, as shown in Fig. 7 curve 2, because the drain-source voltage of this power tube is in the below of safe voltage time graph, so the grid controlling power tube in official hour internal controller is high level always, allow power tube conducting; For another example, as Fig. 7, when load is short circuit, the drain-source voltage of power tube has just exceeded safe voltage time graph U1 in the t1 moment, so controller exports the grid of a low level to power tube in the t1 moment, i.e. and switch-off power pipe; And for example in Fig. 9, when load is the Halogen lamp LED of 200 watts, the drain-source voltage of power tube has just exceeded safe voltage time graph U2 in the t2 moment, so controller exports the grid of a low level to power tube in the t2 moment, i.e. and switch-off power pipe.
In sum, be only the preferred embodiment of the present invention, do not limit protection scope of the present invention with this, all equivalence changes done according to the scope of the claims of the present invention and description with modify, be all within scope that patent of the present invention contains.
Claims (4)
1. a flasher for power valve protective circuit, comprises power subsystem, load Halogen lamp LED and controller, wherein: power subsystem comprises 12V DC power supply storage battery; Controller positive terminal connects load Halogen lamp LED one end, and negative pole end connects power subsystem; Controller comprises power tube, sampling unit and control unit, it is characterized in that: power tube drain electrode is connected with load Halogen lamp LED, and source electrode is connected with sampling unit, and grid is connected with control unit; Sampling unit comprises current-limiting resistance and two series resistances, and current-limiting resistance one end is connected with power tube source electrode, and the other end is connected with power subsystem negative pole; Two series resistances comprise the first resistance and the second resistance, and one end of the first resistance is connected with power tube source electrode, and the other end of the first resistance is connected with one end of the second resistance, and the other end of the second resistance drains with power tube and is connected; Control unit comprises security check unit, oscillator signal unit and signal driving unit, security check unit at least comprises a voltage comparator, voltage comparator in-phase input end is connected to the contact place between current-limiting resistance and power tube source electrode, and the intermediate contact place that first, second resistant series is formed then is connected with voltage comparator inverting input; Oscillator signal unit determines flicker frequency and clocking, the signal also processed from security check unit exports, oscillator signal unit comprises first, second and third trigger being d type flip flop, wherein the C end of three d type flip flops is the clock signal input terminal be connected with clock signal, first trigger D end is connected with the output of voltage comparator, first trigger Q end is held with the second trigger D and is connected, and the second trigger Q end is held with the 3rd trigger D and is connected; Second, third trigger Q end is all connected with the input of signal driving unit, and the output of synchronous signal driver element is connected with power tube grid.
2. the flasher of power valve protective circuit as claimed in claim 1, is characterized in that: the positive terminal of voltage comparator, oscillator signal unit input and signal driving unit input are all connected with load Halogen lamp LED.
3. the flasher of power valve protective circuit as claimed in claim 1; it is characterized in that: control unit also comprises voltage stabilizing reference cell; voltage stabilizing reference cell connects load Halogen lamp LED, and voltage stabilizing reference cell is connected with safety detection unit, oscillator signal unit and signal driving unit respectively.
4. the flasher of power valve protective circuit as claimed in claim 2 or claim 3, is characterized in that: security check unit output connects oscillator signal unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210555414.1A CN103491666B (en) | 2012-12-19 | 2012-12-19 | A kind of flasher of power valve protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210555414.1A CN103491666B (en) | 2012-12-19 | 2012-12-19 | A kind of flasher of power valve protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103491666A CN103491666A (en) | 2014-01-01 |
| CN103491666B true CN103491666B (en) | 2015-07-29 |
Family
ID=49831530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210555414.1A Active CN103491666B (en) | 2012-12-19 | 2012-12-19 | A kind of flasher of power valve protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103491666B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143640A (en) * | 2011-04-20 | 2011-08-03 | 杭州士兰微电子股份有限公司 | LED (light-emitting diode) drive control circuit |
| CN102684166A (en) * | 2011-03-17 | 2012-09-19 | 登丰微电子股份有限公司 | Transistor circuit with protection function |
| CN102711321A (en) * | 2012-05-04 | 2012-10-03 | 福建捷联电子有限公司 | Light emitting diode driving circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201479422U (en) * | 2009-08-07 | 2010-05-19 | 数能科技股份有限公司 | Light emitting diode constant current driving element structure |
| TWI523568B (en) * | 2011-02-15 | 2016-02-21 | 力林科技股份有限公司 | Light emitting diode driving apparatus |
| TWI547197B (en) * | 2011-03-22 | 2016-08-21 | 登豐微電子股份有限公司 | Controller and led driving circuit with current limiting function |
-
2012
- 2012-12-19 CN CN201210555414.1A patent/CN103491666B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684166A (en) * | 2011-03-17 | 2012-09-19 | 登丰微电子股份有限公司 | Transistor circuit with protection function |
| CN102143640A (en) * | 2011-04-20 | 2011-08-03 | 杭州士兰微电子股份有限公司 | LED (light-emitting diode) drive control circuit |
| CN102711321A (en) * | 2012-05-04 | 2012-10-03 | 福建捷联电子有限公司 | Light emitting diode driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103491666A (en) | 2014-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105244850B (en) | Battery protecting circuit and its control method | |
| CN201549882U (en) | Insulated gate dipole transistor protection device | |
| CN204216632U (en) | Battery discharge prevention circuit | |
| CN204666703U (en) | The current detection circuit of quick charging battery fender | |
| CN109659905A (en) | A kind of IPM overcurrent and thermal-shutdown circuit | |
| CN103491666B (en) | A kind of flasher of power valve protective circuit | |
| CN103107520B (en) | Lithium ion battery overheat protector system and method | |
| CN202840563U (en) | Rechargeable battery protective circuit | |
| CN103094932B (en) | A kind of electric power system and power protecting circuit thereof | |
| CN209562148U (en) | A kind of IPM overcurrent and thermal-shutdown circuit | |
| CN102088248B (en) | Intrinsically safe power supply with high output power | |
| CN203352914U (en) | LED protection device | |
| CN202998598U (en) | Power tube protection circuit flasher | |
| CN102957133A (en) | IGBT (Insulated Gate Bipolar Translator) over-current withdraw protection circuit of frequency converter | |
| CN203387165U (en) | High-speed half-bridge MOSFET short circuit protection circuit | |
| CN111697540B (en) | Frequency converter inversion IGBT short circuit detection protection system based on differential circuit | |
| CN202111886U (en) | Induction cooker with IGBT (insulated gate bipolar transistor) overvoltage protection function | |
| CN203274949U (en) | Over-temperature detection and protection circuit of current transformer | |
| CN204205547U (en) | A kind of current foldback circuit for large power supply input | |
| CN204497715U (en) | A kind of microcomputer protecting controller with heat sinking function | |
| JP5491666B1 (en) | Solar cell characteristic measuring device | |
| CN201699599U (en) | Intrinsic-intrinsic-safety power supply with high output power | |
| CN203324355U (en) | Microwave-system diverse self-checking circuit | |
| CN202050228U (en) | Short circuit protective circuit of motor controller | |
| CN110837020A (en) | Three-level topology inverter circuit power device detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200422 Address after: 610000 no.12-18, floor 9, building 2, no.1366, middle section of Tianfu Avenue, Chengdu high tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu Patentee after: Chengdu Lixin Semiconductor Co., Ltd Address before: 518000, three floor, Jin 318, design Industrial Park, 3838 Nanshan Road, Shenzhen, Guangdong, Nanshan District Patentee before: SHENZHEN AMPLIFY ELECTRONICS Co.,Ltd. |