CN202998598U - Power tube protection circuit flasher - Google Patents
Power tube protection circuit flasher Download PDFInfo
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- CN202998598U CN202998598U CN 201220708068 CN201220708068U CN202998598U CN 202998598 U CN202998598 U CN 202998598U CN 201220708068 CN201220708068 CN 201220708068 CN 201220708068 U CN201220708068 U CN 201220708068U CN 202998598 U CN202998598 U CN 202998598U
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- power tube
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- flasher
- resistance
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Abstract
Provided is a power tube protection circuit flasher, comprising a power supply unit, a load halogen lamp and a controller, wherein the load halogen lamp is in series connection with the controller and is in connection with two ends of the power supply unit. The controller can remotely monitor drain-source current of a power tube and conduction and cut-off of a voltage control power tube, thereby overcoming the process integration difficulty of placing a temperature detection unit and a power tube on a same chip, realizing remotely protecting the power tube and thereby guaranteeing normal operation of a flasher.
Description
Technical field
The utility model provides a kind of flasher of power valve protective circuit.
Technical background
Flasher is comprised of controller and power tube two parts, the drain-source On current of controller power limitation pipe (for example 20 amperes), in the moment of opening the conducting of power tube drain-source, the drain-source current of power tube can be near cut-off current, large electric current can be kept a hundreds of microsecond, therefore the power tube internal temperature can raise rapidly, and particularly in the load short circuits situation, this situation is particularly evident.Will burn out power tube when the power tube internal temperature surpasses its rated value, therefore need to protect power tube not to be burned by number of ways (as the temperature protection technology).At present mainly protect power tube by the drain-source current of power limitation pipe and the temperature of detection power pipe.
And the working temperature of detection power pipe mainly contains following two kinds of methods at present: a kind of is that temperature detecting unit and power tube are made on same chip; Another kind be temperature sensor as far as possible near power tube with probe power pipe temperature.Because second method is only worked as the power tube temperature rise speed to temperature sensor than time slack just effectively near power tube with probe power pipe temperature as far as possible; therefore; when the power tube temperature raises rapidly; chip temperature and package temperature are inconsistent; when even chip conducting channel and chip substrate temperature were inconsistent, this way can not be protected power tube.Therefore, temperature detecting unit and power tube are made on same chip is power tube temperature checking method comparatively commonly used at present to the first.
But, that temperature detecting unit and power tube are made in the integrated difficulty of technique on same chip is high due to this, and the domestic processing line that there is no the good power tube of performance (VDMOS) and plane process compatible, only select the processing line of the power tube (LDMOS) of poor performance, this has just reduced properties of product.
For the integrated difficulty of technique that overcomes VDMOS power tube device for monitoring temperature high; improve simultaneously the reliability of power valve protective circuit, but the flasher of the power valve protective circuit of the conducting of a kind of drain-source current of remote monitoring power tube and drain-source voltage power ratio control pipe and cut-off is provided.
The utility model content
For solving the problems of the technologies described above, but the purpose of this utility model is to provide a kind of drain-source current of remote monitoring power tube, conducting and the cut-off of voltage control power tube, thus the flasher of the power valve protective circuit that the protection flasher can work.
For achieving the above object, the flasher of a kind of power valve protective circuit of the utility model, it comprises power subsystem, load Halogen lamp LED and controller, it is characterized in that: described load Halogen lamp LED is connected with described controller, and accesses the two ends of described power subsystem.
On the basis of above-mentioned preferred version, described controller comprises power tube, the sampling unit and the control unit that are connected with described power tube, described power tube and described control unit also connect, and the drain electrode of described power tube is connected with the negative pole of described power subsystem, and its source electrode connects described sampling unit.
On the basis of above-mentioned preferred version; described sampling unit protection current-limiting resistance and two series resistances; one end of described current-limiting resistance is connected with described power tube; its other end connects the negative pole of described power subsystem; described two series resistance one ends are connected with the source electrode of described this power tube, and its other end connects the drain electrode of described power tube.
On the basis of above-mentioned preferred version, described two series resistances comprise the first resistance and second resistance of connecting with described the first resistance, described the first resistance is connected with the source electrode of this power tube, described the second resistance is connected with the drain electrode of described power tube, and described control unit is connected with the intermediate contact of described the first resistance with the second resistance series connection.
On the basis of above-mentioned preferred version, described control unit comprises safety verification unit, signal oscillating unit and signal driving unit, described safety verification unit one end connects described current-limiting resistance, its other end is connected with described signal oscillating unit, described signal driving unit connects the output of described signal oscillating unit, and the output of described signal driving unit is connected with the grid of described power tube.
On the basis of above-mentioned preferred version, described control unit also comprises a voltage stabilizing reference cell, and described voltage stabilizing reference cell is connected with described load Halogen lamp LED, and with described safety detection unit, described signal oscillating unit be connected signal driving unit and be connected.
On the basis of above-mentioned preferred version, described signal oscillating unit comprises a trigger at least.
On the basis of above-mentioned preferred version, described signal oscillating unit comprises three triggers, and described three triggers are connected mutually, and the C port of three triggers all is connected with a clock pulse signal.
On the basis of above-mentioned preferred version, described safety verification unit comprises a voltage comparator at least.
The utility model compared with prior art; its beneficial effect is: the utility model is by the drain-source current of remote monitoring power tube, conducting and the cut-off of voltage control power tube; must be in the limitation of same chip and same position thereby overcome power tube and the temperature detecting module in the temperature checking method; realize the remote protecting power tube, thereby guarantee that flasher can work.
Description of drawings
Fig. 1 is the circuit flow process block schematic diagram of the preferred version of the utility model.
Fig. 2 is the circuit flow process block schematic diagram of another preferred version of the utility model.
Fig. 3 is the circuit diagram of the preferred version of the utility model.
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 50 watts of power tube loads 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 the technology contents, the structural feature that describe the utility model in detail, reached purpose and effect, below hereby exemplify embodiment and coordinate accompanying drawing to be explained in detail.
See also shown in Figure 1ly, and in conjunction with consulting shown in Fig. 2 to 5, the utility model provides a kind of flasher of power valve protective circuit, and it comprises power subsystem 10, load Halogen lamp LED 20 and controller 30, wherein:
This power subsystem 10 comprises storage battery (not shown), adopts the 12V DC power supply;
Please shown in Figure 3 in conjunction with consulting again, this load Halogen lamp LED 20 is 50 tile loads, this power subsystem 10 of access after connecting with described controller 30;
Please continue to consult Fig. 1, and shown in Figure 4 in conjunction with consulting, the positive terminal of this controller 30 connects an 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:
See also shown in Figure 1ly, this power tube 31 connects described sampling units 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;
Please consult again Fig. 1, and shown in Figure 5 in conjunction with consulting, described sampling unit 32 can be identified sampling to current/voltage, this sampling unit 32 comprises current-limiting resistance 321 and two series resistances 322, wherein: an 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 ends, thereby plays restriction and detect the effect of passing through these power tube 31 electric currents; This two series resistance 322 comprises the second resistance 3222 of the first resistance 3221 and series connection thereof, described the first resistance 3221 is connected with the source electrode of this power tube 31, described the second resistance 3222 is connected with the drain electrode of described power tube 31, safe voltage value and sampling voltage value when detecting by this described power tube work, intermediate contact place in first, second resistance 3221,3222 series connection is connected with described control unit 33, and the magnitude of voltage when this power tube 31 that is detected of taking a sample out is by this worked is delivered to described control unit 33;
Please consult again Fig. 1 and shown in Figure 5, this control unit 33 also is connected with the grid of described power tube 31 when connecting described load Halogen lamp LED 20, the first preferred version of described control unit 33 comprises: safety verification unit 332, signal oscillating unit 333 and signal driving unit 334, wherein:
described safety verification unit 332 comprises voltage comparator 3321, safe current and magnitude of voltage when this voltage comparator 3321 works in order to detect described power tube 31, thereby guaranteeing not occur overload damages, in this preferred version, this safety verification unit 332 1 ends connect described current-limiting resistances 321, the other end connects this signal oscillating unit 333, safe current magnitude of voltage when this current-limiting resistance 312 can be described safety verification unit 332 and provides by described power tube 31 normal operation, equally, this safety verification unit 332 is under the effect of two series resistances 322, make (-) reverse input end of delivering to this safety verification unit 332 compare with the reference voltage that (+) in-phase input end is connected, its comparative result is delivered to signal oscillating unit 333 data input pins, for example: (-) reverse input end of delivering to the voltage comparator 3321 in this safety verification unit 332 when load compares with the reference voltage that (+) in-phase input end connects, comparative result is delivered to (D) data input pin of the first trigger 3331 of described signal oscillating unit 333, when 20 loads of load Halogen lamp LED are 200 watt-hours, this power tube 31 is under the state of conducting current limliting, to described safety verification unit 332 transmission of signals, its safety verification unit 332 leakages of this power tube 31 of detection in real time, source voltage, if the leakage of this power tube 31 of a certain moment, source voltage terminal has surpassed when being stored in this described power tube 31 internal security voltage, the grid of described power tube 31 is understood immediately and controlled at synchronization in described safety verification unit 332, allow its cut-off, thereby protect this power tube 31.
please continue to consult Fig. 1 and shown in Figure 5, described signal oscillating unit 333 has the decision flicker frequency, the function of clocking, process simultaneously the signal output from described safety verification unit 332, this signal oscillating unit 333 comprises the first trigger 3331, the second trigger 3332 and the 3rd trigger 3333, in this preferred version, described the first trigger 3331, the second trigger 3332 and the 3rd trigger 3333 are series connection mutually, and (C) port of this three trigger all is connected with clock pulse signal, wherein: (D) end of described the first trigger 3331 is connected with the output of described voltage comparator 3321, (Q) end of described the first trigger 3331 is connected with (D) end of described the second trigger 3332, (Q) end of described the second trigger 3332 is connected with (D) end of the 3rd trigger 3333, and (Q) of described the second trigger 3332 and the 3rd trigger 3333 end all is connected with described signal driving unit 334, in this preferred version, described voltage comparator 3321 outputs are connected with safety verification unit 332, described safety verification unit 332 is connected with described signal driving unit 334, the intermediate contact place of the negative input end of described voltage comparator 3321 and described this first, second resistance 3221,3222 series connection 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, and wherein: these power tube 31 safe voltages are that time, temperature, the load abnormal with when work changes, and changes as the variation such as short circuit.In fact, this signal driving unit 334 receives described signal oscillating unit 333 signals, and its signal oscillating unit 333 receives described safety verification unit 332 signals, and finally is delivered to described power tube 31 by the signal that each function produces and obtains that control should be arranged; Above-mentionedly know; the virtual voltage of the voltage comparator 3321 described power tubes 31 of Real-time Collection in this safety verification unit 332; and the virtual voltage in this power tube 31 is compared with safe voltage; the gained signal be will compare and described signal oscillating unit 333 and described signal driving unit 334 exported to; after described signal oscillating unit 333 and 334 computings of described signal driving unit; utilize the operation result of its acquisition to control the conducting of described power tube 31/close, protect by this described power tube 31.
please consult again Fig. 2, the second preferred version that has wherein represented this control unit 33, as this preferred version, this control unit 33 further comprises voltage stabilizing reference cell 331, this voltage stabilizing reference cell 331 can be described safety check control unit 332 stable operating voltage and reference voltage is provided, described voltage stabilizing reference cell 331 connect described load Halogen lamp LEDs 20 and with described safety detection unit 332, described signal oscillating unit 333 be connected signal driving unit 334 and connect, more stable in order to allow power supply supply with because of it, 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 and aforementioned the first preferred version are basic identical, for saving the word length, also be convenient to read quick, do not remake for this reason and repeat to give unnecessary details.
As preferred version of the present utility model, described signal oscillating of the present utility model unit 333 comprises a trigger at least, and is more accurate in order to guarantee operation result, and described signal oscillating unit 333 is three triggers preferably.
As preferred version of the present utility model, described safety verification of the present utility model unit 332 can comprise two and above voltage comparator 3321.
To sum up, through testing: the flasher of this a kind of power valve protective circuit, its power tube maximum ON time curve under various supply voltages, the safe voltage time graph of abbreviation power tube is as power tube V-t curve in Fig. 6; Under light-load conditions, see also shown in Figure 7ly, be the voltage time history plot at the drain-source two ends of this power tube, this curve is always below the safe voltage time graph of power tube, so the conducting always of controller power ratio control pipe; Under short circuit condition, see also Fig. 8, the voltage time history plot at the drain-source two ends of this power tube, t1 constantly the voltage U 1 at the drain-source two ends of power tube surpassed the safe voltage of power tube, so controller is in t1 power ratio control pipe cut-off constantly; See also 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, t2 constantly the voltage U 2 at the drain-source two ends of power tube surpassed the safe voltage of power tube, so controller is in t2 power ratio control pipe cut-off constantly;
By the power tube V-t curve synoptic diagram under above-mentioned various states in experimentation as can be known: when load is the Halogen lamp LED of 50 watts, in the 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 the drain-source voltage on power tube reduces gradually along with the heating of filament, as shown in Fig. 7 curve 2, due to the drain-source voltage of this power tube below the safe voltage time graph, so the official hour internal controller always the grid of power ratio control pipe be high level, allow the power tube conducting; As Fig. 7, when load was short circuit, the drain-source voltage of power tube had constantly just surpassed safe voltage time graph U1 at t1 for another example, so controller is exported a low level to the grid of power tube, i.e. switch-off power pipe constantly at t1; And for example in Fig. 9, when load was the Halogen lamp LED of 200 watts, the drain-source voltage of power tube had constantly just surpassed safe voltage time graph U2 at t2, so controller is exported a low level to the grid of power tube, i.e. switch-off power pipe constantly at t2.
In sum, be only the preferred embodiment of the utility model, do not limit protection range of the present utility model with this, all equivalences of doing according to the utility model the scope of the claims and description change and modify, within being all the scope that the utility model patent contains.
Claims (9)
1. the flasher of a power valve protective circuit, it comprises power subsystem, load Halogen lamp LED and controller, it is characterized in that: described load Halogen lamp LED is connected with described controller, and accesses the two ends of described power subsystem.
2. the flasher of power valve protective circuit according to claim 1; it is characterized in that: described controller comprises power tube, the sampling unit and the control unit that are connected with described power tube; described power tube and described control unit also connect; and the drain electrode of described power tube is connected with the negative pole of described power subsystem, and its source electrode is connected with described sampling unit.
3. the flasher of power valve protective circuit according to claim 2; it is characterized in that: described sampling unit comprises current-limiting resistance and two series resistances; one end of described current-limiting resistance is connected with described power tube; its other end connects the negative pole of described power subsystem; described two series resistance one ends are connected with the source electrode of described this power tube, and its other end connects the drain electrode of described power tube.
4. the flasher of power valve protective circuit according to claim 3; it is characterized in that: described two series resistances comprise the first resistance and second resistance of connecting with described the first resistance; described the first resistance is connected with the source electrode of this power tube; described the second resistance is connected with the drain electrode of described power tube, and described control unit is connected with the intermediate contact of described the first resistance with the second resistance series connection.
5. the flasher of power valve protective circuit according to claim 2; it is characterized in that: described control unit comprises safety verification unit, signal oscillating unit and signal driving unit; described safety verification unit one end connects described current-limiting resistance; its other end is connected with described signal oscillating unit; described signal driving unit connects the output of described signal oscillating unit, and the output of described signal driving unit is connected with the grid of described power tube.
6. the flasher of power valve protective circuit according to claim 5; it is characterized in that: described control unit also comprises the voltage stabilizing reference cell; described voltage stabilizing reference cell is connected with described load Halogen lamp LED, and with described safety detection unit, described signal oscillating unit be connected signal driving unit and be connected.
7. the flasher of power valve protective circuit according to claim 5 is characterized in that: described signal oscillating unit comprises a trigger at least.
8. the flasher of power valve protective circuit according to claim 7 is characterized in that: described signal oscillating unit comprises three triggers, and described three triggers are connected mutually, and the C port of three triggers all is connected with clock pulse signal.
9. the flasher of power valve protective circuit according to claim 5 is characterized in that: described safety verification unit comprises a voltage comparator at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220708068 CN202998598U (en) | 2012-12-19 | 2012-12-19 | Power tube protection circuit flasher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220708068 CN202998598U (en) | 2012-12-19 | 2012-12-19 | Power tube protection circuit flasher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202998598U true CN202998598U (en) | 2013-06-12 |
Family
ID=48569719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220708068 Expired - Lifetime CN202998598U (en) | 2012-12-19 | 2012-12-19 | Power tube protection circuit flasher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202998598U (en) |
-
2012
- 2012-12-19 CN CN 201220708068 patent/CN202998598U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200506 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. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |
|
| CX01 | Expiry of patent term |