CN202084277U - Novel protective circuit for switching tube of flyback power source - Google Patents
Novel protective circuit for switching tube of flyback power source Download PDFInfo
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- CN202084277U CN202084277U CN2011200287446U CN201120028744U CN202084277U CN 202084277 U CN202084277 U CN 202084277U CN 2011200287446 U CN2011200287446 U CN 2011200287446U CN 201120028744 U CN201120028744 U CN 201120028744U CN 202084277 U CN202084277 U CN 202084277U
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- supply control
- switching tube
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Abstract
The utility model relates to a novel protective circuit for a switching tube of a flyback power source. A filtering capacitor is connected to a power supply end of a power control IC (integrated circuit), an input end of a switch driving circuit is connected with the anode of a first diode, the cathode of a second diode and a first end of a first resistor, the cathode of the first diode is connected with the power supply end of the power control IC, the anode of the second diode is grounded, and a second end of the first resistor is connected with a grid driving output end of the power control IC.
Description
Technical field
The utility model relates to a kind of switching tube holding circuit of novel flyback power supply.
Background technology
At present a lot of small-power powers are all used the circuit of Flyback pattern work, and it resists design of thunderbolt, adopt more and optimize the Copper Foil cabling, big current signal path and little current signal path are separated, and thunder-strike current cabling and small-signal path are separated.But adopt the method for optimizing the Copper Foil cabling, when the thunderbolt energy is big, still do not have effect.Also have plenty of at power supply AC line input end and append MOV, in order to the thunderbolt energy of restriction from AC network input power supply.But its cost is higher, and this countermeasure can only reduce the thunderbolt energy and enter power supply, if back level design is not good, or the anti-thunderbolt ability of power-supply controller of electric itself is relatively poor, still can cause inefficacy.
In addition, existing a lot of power-supply controller of electric IC, in order to reduce cost, with the area of wafer do very little, the totem-pote circuit area of its driving switch pipe is also very little, also corresponding decline of ability of its anti-thunderbolt.
Summary of the invention
In view of this, the purpose of this utility model provides a kind of switching tube holding circuit of novel flyback power supply, can when thunderbolt takes place the effective grid of protection power supply control IC and switching tube, prolong service life of equipment.
One scheme of employing of the present utility model is: a kind of switching tube holding circuit of novel flyback power supply; comprise power supply control IC; transformer and the switch driving circuit that is connected with this primary end; it is characterized in that: the feeder ear of described power supply control IC is connected with filter capacitor; the positive pole of the input end of described switch driving circuit and one first diode; first end of the negative pole of one second diode and first resistance connects; the negative pole of described first diode connects the feeder ear of power supply control IC; the plus earth of second diode, second end of described first resistance is connected with the gate driving output terminal of described power supply control IC.
In the utility model one embodiment, described power supply control IC is FAN6752MY, and described switch driving circuit comprises: a switching tube, and its drain electrode is connected with the primary side of described transformer, source electrode is connected with first end of an inductance, and second end of described inductance is through one the 4th resistance eutral grounding; One the 3rd diode, its positive pole is connected with the grid of described switching tube, first end of second resistance, first end of the 3rd resistance; Second end of described second resistance is connected with the positive pole of the negative pole of described the 3rd diode and first diode, the negative pole of second diode, the second end ground connection of described the 3rd resistance.
Another program that the utility model adopts is: a kind of switching tube holding circuit of novel flyback power supply, comprise power supply control IC, transformer and the switch driving circuit that is connected with this primary end, it is characterized in that: the filter capacitor that the feeder ear of described power supply control IC connects, first end of the positive pole of the input end of described switch driving circuit and one first diode, the negative pole of one second diode, one the 3rd diode cathode, one first resistance and be connected with first end of second resistance; The negative pole of described the 3rd diode is connected with the gate driving output terminal of described power supply control IC and second end of first resistance; The negative pole of described first diode connects power supply control IC feeder ear; Second end of described second resistance and the plus earth of second diode.
In the utility model one embodiment, described power supply control IC is FAN6752MY, described switch driving circuit comprises: a switching tube, its drain electrode is connected with the primary side of described transformer, source electrode is connected with first end of an inductance, second end of described inductance is through one the 4th resistance eutral grounding, and grid is connected with the positive pole of described first diode.
The utility model is simple in structure, can effectively protect the switching tube of flyback power supply, has good practical values.
Description of drawings
Fig. 1 is the circuit connection diagram of the utility model embodiment one.
Fig. 2 is the circuit diagram that the concrete switch driving circuit of the utility model connects.
Fig. 3 is the power circuit synoptic diagram of application drawing 1 circuit.
Fig. 4 is the circuit connection diagram of chip FAN6752MY internal drive MOSFET.
Fig. 5 is the circuit connection diagram of the utility model embodiment two.
Fig. 6 is the circuit diagram that the concrete switch driving circuit of the utility model connects.
Fig. 7 is the power circuit synoptic diagram of application drawing 5 circuit.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
As shown in Figure 1; a kind of switching tube holding circuit of novel flyback power supply is provided in the utility model embodiment one; comprise power supply control IC; transformer T901 and the switch driving circuit that is connected with this primary end; it is characterized in that: the feeder ear of described power supply control IC is connected with filter capacitor C1; the positive pole of the input end of described switch driving circuit and one first diode D903; first end of the negative pole of one second diode D904 and first resistance R 1 connects; the negative pole of the described first diode D903 meets power supply control IC feeder ear GATE; the plus earth of the second diode D904, second end of described first resistance R 1 is connected with the gate driving output terminal of described power supply control IC.
Please refer to Fig. 2, described power supply control IC is FAN6752MY, and described switch driving circuit comprises: a switching tube Q901, and its drain electrode is connected with the primary side of described transformer, source electrode is connected with first end of an inductance FB901, and second end of described inductance is through one the 4th resistance R, 4 ground connection; One the 3rd diode D906, its positive pole is connected with the grid of described switching tube Q901, first end of second resistance R 2, first end of the 3rd resistance R 3 and the positive pole of the described first diode D903; Second end of described second resistance is connected with the negative pole of described the 3rd diode D906, the second end ground connection of described the 3rd resistance R 3.
See also Fig. 3, Fig. 4, Fig. 3 is a power circuit synoptic diagram of using above-mentioned Fig. 1 circuit, and Fig. 4 is the circuit connection diagram of chip FAN6752MY internal drive MOSFET.
As shown in Figure 5, among the utility model embodiment two, a kind of switching tube holding circuit of novel flyback power supply is provided, comprise power supply control IC, transformer T901 and the switch driving circuit that is connected with this primary end, it is characterized in that: the filter capacitor C1 that the feeder ear of described power supply control IC connects, first end of the positive pole of the input end of described switch driving circuit and one first diode D903, the negative pole of one second diode D904, one the 3rd diode D906 positive pole, one first resistance R 2 and be connected with first end of second resistance R 3; The negative pole of described the 3rd diode D906 is connected with the gate driving output terminal GATE of described power supply control IC and second end of first resistance R 2; The negative pole of described first diode connects the anode of the filter capacitor of power supply control IC feeder ear; Second end of described second resistance and the plus earth of the second diode D904.
Please refer to Fig. 6 and Fig. 7, in present embodiment, described power supply control IC is FAN6752MY, described switch driving circuit comprises: a switching tube Q901, its drain electrode is connected with the primary side of described transformer, source electrode is connected with first end of an inductance FB901, and second end of described inductance is through one the 4th resistance R, 4 ground connection, and grid is connected with the positive pole of the described first diode D903.The circuit working principle of present embodiment is stated with regard to not tiring out at this with above-mentioned the same.
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (4)
1. the switching tube holding circuit of a novel flyback power supply; comprise power supply control IC; transformer and the switch driving circuit that is connected with this primary end; it is characterized in that: the feeder ear of described power supply control IC is connected with filter capacitor; the positive pole of the input end of described switch driving circuit and one first diode; first end of the negative pole of one second diode and first resistance connects; the negative pole of described first diode connects the feeder ear of power supply control IC; the plus earth of second diode, second end of described first resistance is connected with the gate driving output terminal of described power supply control IC.
2. the switching tube holding circuit of novel flyback power supply according to claim 1 is characterized in that: described power supply control IC is FAN6752MY, and described switch driving circuit comprises:
One switching tube, its drain electrode is connected with the primary side of described transformer, and source electrode is connected with first end of an inductance, and second end of described inductance is through one the 4th resistance eutral grounding;
One the 3rd diode, its positive pole is connected with the grid of described switching tube, first end of second resistance, first end of the 3rd resistance; Second end of described second resistance is connected with the positive pole of the negative pole of described the 3rd diode and first diode, the negative pole of second diode, the second end ground connection of described the 3rd resistance.
3. the switching tube holding circuit of a novel flyback power supply, comprise power supply control IC, transformer and the switch driving circuit that is connected with this primary end, it is characterized in that: the filter capacitor that the feeder ear of described power supply control IC connects, first end of the positive pole of the input end of described switch driving circuit and one first diode, the negative pole of one second diode, one the 3rd diode cathode, one first resistance and be connected with first end of second resistance; The negative pole of described the 3rd diode is connected with the gate driving output terminal of described power supply control IC and second end of first resistance; The negative pole of described first diode connects power supply control IC feeder ear; Second end of described second resistance and the plus earth of second diode.
4. the switching tube holding circuit of novel flyback power supply according to claim 1 is characterized in that: described power supply control IC is FAN6752MY, and described switch driving circuit comprises:
One switching tube, its drain electrode is connected with the primary side of described transformer, and source electrode is connected with first end of an inductance, and second end of described inductance is through one the 4th resistance eutral grounding, and grid is connected with the positive pole of described first diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200287446U CN202084277U (en) | 2011-01-28 | 2011-01-28 | Novel protective circuit for switching tube of flyback power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200287446U CN202084277U (en) | 2011-01-28 | 2011-01-28 | Novel protective circuit for switching tube of flyback power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202084277U true CN202084277U (en) | 2011-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200287446U Expired - Fee Related CN202084277U (en) | 2011-01-28 | 2011-01-28 | Novel protective circuit for switching tube of flyback power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202084277U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426333A (en) * | 2013-08-27 | 2015-03-18 | 三菱电机株式会社 | Driving circuit and semiconductor device |
| CN109327018A (en) * | 2017-08-01 | 2019-02-12 | 深圳市暗能量电源有限公司 | LED street lamp driving power lightning protection circuit |
-
2011
- 2011-01-28 CN CN2011200287446U patent/CN202084277U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426333A (en) * | 2013-08-27 | 2015-03-18 | 三菱电机株式会社 | Driving circuit and semiconductor device |
| CN104426333B (en) * | 2013-08-27 | 2017-05-03 | 三菱电机株式会社 | Driving circuit and semiconductor device |
| CN109327018A (en) * | 2017-08-01 | 2019-02-12 | 深圳市暗能量电源有限公司 | LED street lamp driving power lightning protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20150128 |
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| EXPY | Termination of patent right or utility model |