CN201355571Y - Flyback transformer - Google Patents
Flyback transformer Download PDFInfo
- Publication number
- CN201355571Y CN201355571Y CNU200820184170XU CN200820184170U CN201355571Y CN 201355571 Y CN201355571 Y CN 201355571Y CN U200820184170X U CNU200820184170X U CN U200820184170XU CN 200820184170 U CN200820184170 U CN 200820184170U CN 201355571 Y CN201355571 Y CN 201355571Y
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- Prior art keywords
- inductance coil
- secondary inductance
- former limit
- inverse
- diode
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Abstract
The utility model relates to a flyback transformer which comprises a switch tube Q1, a primary side inductance coil L3 and secondary side inductance coils L4 and L5; one end of the primary side inductance coil is connected with direct current, and the other end is grounded by the switch tube Q1; the secondary side inductance coils comprise a first secondary side inductance coil L4 and a second secondary side inductance coil L5; a third diode D3 and a fourth capacitor C4 are subsequently connected between one end of the first secondary side inductance coil L4 and the ground; a voltage output end is connected between the third diode D3 and the fourth capacitor C4; the other end of the first secondary side inductance coil L4 is grounded; one end of the second secondary side inductance coil L5 is connected with the other voltage output end; a loader R1 and a first capacitor C1 are parallelly connected between the other voltage output end and the ground; a second diode D2 is positively connected between the other end of the second secondary side inductance coil L5 and the ground; and consequently, the utility model provides a flyback transformer capable of over-voltage protection and generating positive voltage and negative voltage at the same time.
Description
Technical field
The utility model relates to a kind of transformer, particularly a kind of inverse-excitation type transformer that overvoltage protection is arranged and can produce positive voltage and negative voltage simultaneously.
Background technology
Referring to Fig. 1, the circuit structure and the operation principle of existing inverse-excitation type transformer are: by the alternating current that power supply provided of outside after over commutation and filtering, converting direct current to is the electrical appliance power supply, make direct current be added in the upper end of the former limit of inverse-excitation type transformer inductance coil L1, the lower end of the former limit of inverse-excitation type transformer inductance coil L1 links to each other with switch mosfet pipe Q, the high-frequency pulse signal that control switch mosfet pipe Q cut-offs for the outside, when high-frequency pulse signal is high level, make switch mosfet pipe Q conducting, above-mentioned direct voltage is added in the two ends of former limit inductance coil L1, make in the former limit inductance coil L1 current flowing is arranged, electric current in former limit inductance coil L1 is changed, the magnetic flux of former limit inductance coil L1 changes and produces magnetic energy, when the high-frequency pulse signal of outside is low level, switch mosfet pipe Q ends, the interior no current circulation of former limit inductance coil L1 this moment, magnetic energy will be transferred among the secondary inductance coil L2 among the described former limit inductance coil L1, reach when switch mosfet pipe Q conducting, former limit inductance coil L1 stores magnetic energy, when switch mosfet pipe Q ends, the magnetic energy that former limit inductance coil L1 stores is discharged among the secondary inductance coil L2, and produces positive voltage at the different name end.When the transformer ratio was 1: 1, the two ends of secondary inductance coil L2 produced correspondent voltage, and described voltage reduces ripple through diode D rectification and output capacitance C, becomes DC power supply, uses as power supply, for each electrical appliance is powered.
Yet the shortcoming of prior art is, owing to there is not overvoltage protection, damages transformer easily, and positive direct current can only be provided, and when needs use when utilizing the electrical appliance that negative voltage powers, reduced the life-span of electrical appliance.For example when using ceramic gold-halogen lamp,, during the lamp operate as normal, power, repel reflection with the ion generation of positively charged in the lamp by positive voltage though lamp can be lighted, very big for the life-span influence of lamp.Therefore, demand is a kind of can to produce positive voltage and negative voltage, is that positive voltage and negative voltage can use simultaneously, and the electrical appliance that uses negative voltage work is carried out the inverse-excitation type transformer of negative voltage power supply.
The utility model content
At the defective of above-mentioned prior art, the purpose of this utility model provide a kind of can overvoltage protection and can produce the inverse-excitation type transformer of positive voltage and negative voltage simultaneously.
A kind of inverse-excitation type transformer, comprise switching tube Q1, former limit inductance coil L3 and secondary inductance coil L4, L5, described former limit inductance coil L3 and described secondary inductance coil are coupled, described former limit inductance coil one termination has direct current, the other end is by described switching tube Q1 ground connection, described secondary inductance coil is the first secondary inductance coil L4 and the second secondary inductance coil L5, be connected to the 3rd diode D3 and the 4th capacitor C 4 between the end of the described first secondary inductance coil L4 and the ground successively, be connected with voltage output end between described the 3rd diode D3 and the 4th capacitor C 4, the other end of the described first secondary inductance coil L4 connects ground; The described second secondary inductance coil L5, one end connects another voltage output end, is parallel with the load R1 and first capacitor C 1 between described another voltage output end and the ground, and forward is connected with the second diode D2 between the other end of the described second secondary inductance coil L5 and the ground.
Be parallel with the voltage stabilizing didoe WD first diode D1 relative of series connection successively between the inverse-excitation type transformer of the present utility model, wherein said former limit inductance coil L3 and described switching tube Q1 with negative pole.
Inverse-excitation type transformer of the present utility model, the wherein said first secondary inductance coil L4 is relative with second secondary inductance coil L5 end of the same name.
Inverse-excitation type transformer of the present utility model is parallel with the 3rd capacitor C 3 between the drain electrode of wherein said switching tube Q1 and source electrode.
Inverse-excitation type transformer of the present utility model, the wherein said second diode D2 are parallel with second capacitor C 2 and the resistance R of series connection successively.
Inverse-excitation type transformer of the present utility model, the transformer ratio of wherein said first secondary inductance coil L4 and described former limit inductance coil L3 is 1: 1; The transformer ratio of described second secondary inductance coil L5 and described former limit inductance coil L3 is 1: 1.
Inverse-excitation type transformer of the present utility model, wherein said switching tube Q1 is the switch mosfet pipe.
Inverse-excitation type transformer of the present utility model is added with the direct voltage of 300V on the wherein said former limit inductance coil L3.
Owing to added relative voltage stabilizing didoe and diode at the two ends of former limit inductance coil, thereby played the effect of overvoltage protection, again owing to make the secondary inductance coil have two, can produce positive voltage and negative voltage simultaneously, make the first secondary inductance coil produce the positive voltage of 300V, make the second secondary inductance coil produce the negative voltage of 300V, thereby produce the pressure reduction of 600V, when for example using ceramic gold-halogen lamp, lamp can be lighted; When the lamp operate as normal, adopt negative voltage to power.
Description of drawings
Fig. 1 is the circuit theory diagrams of prior art inverse-excitation type transformer;
Fig. 2 is the circuit theory diagrams of the utility model inverse-excitation type transformer.
Embodiment
Below in conjunction with accompanying drawing execution mode of the present utility model is elaborated.
Referring to Fig. 2; embodiment of the present utility model by the alternating current that power supply provided of outside after over commutation and filtering; the former limit inductance coil L3 upper end that converts direct current to and be transformer powers up; increased the relative voltage stabilizing didoe WD and the first diode D1 of negative pole that link to each other successively at the two ends of former limit inductance coil L3; be used for system is carried out overvoltage protection; owing on former limit inductance coil L3, store magnetic energy; when switch mosfet pipe Q1 ends; lower end at former limit inductance coil L3 can produce high pressure; well do not protect if having well this moment; can export very high voltage; damage load, therefore, after the lower end of former limit inductance coil L3 produces too high high pressure; voltage stabilizing didoe WD can be firmly stable with voltage; thereby guarantee the normal output of transformer, the effect of the first diode D1 is, when not having high pressure to produce in inductance coil L3 lower end, former limit; make the voltage of former limit inductance coil L3 upper end end, make it by former limit inductance coil L3 at the first diode D1 place.Between the drain electrode of switch mosfet pipe Q1 and source electrode, connect the 3rd high capacitor C 3 of withstand voltage; in the moment that switch mosfet pipe Q1 ends; the high pressure that the lower end of former limit inductance coil L3 produces is charged in the 3rd capacitor C 3 simultaneously; electric energy in the capacitor C 3 discharges when switch mosfet pipe Q1 conducting, plays the effect of protection switch mosfet pipe Q1.
The lower end of the former limit of inverse-excitation type transformer inductance coil L3 links to each other with switch mosfet pipe Q1, the high-frequency pulse signal that control switch mosfet pipe Q1 cut-offs for the outside, when high-frequency pulse signal is high level, make switch mosfet pipe Q1 conducting, the 300V direct voltage of former limit inductance coil L3 upper end is added in the two ends of former limit inductance coil L3, make inductance coil L3 inside, former limit that current flowing be arranged, thereby on former limit inductance coil L3, store magnetic energy, because the effect of the second diode D2 and the 3rd diode D3, at this moment, can not cause that in the secondary inductance coil electric current flows because of producing induced voltage.When the high-frequency pulse signal of outside is low level, switch mosfet pipe Q1 ends, the magnetic energy that store among the former limit inductance coil L3 this moment discharges in the secondary inductance coil, and magnetic energy is transferred to the secondary inductance coil, and the different name end of described secondary inductance coil produces corresponding high voltage.Described secondary inductance coil has two, the first secondary inductance coil L4 and the second secondary inductance coil L5, the first secondary inductance coil (L4) is relative with the second secondary inductance coil (L5) end of the same name, upper end at the first secondary inductance coil L4 produces high voltage, be 300V, carry out rectification and the 4th capacitor C 4 is carried out filtering by the 3rd diode D3, export the voltage of positive 300V; Lower end ground connection at the first secondary inductance coil L4 is 0V; Lower end at the second secondary inductance coil L5 produces high voltage 300V, owing to the second diode D2 ground connection of using by rectification, reduce to 0 through voltage behind the second diode D2, again owing to link to each other with load R1 by earth terminal, and be connected to the upper end of the second secondary inductance coil L5, be filtered into the negative 300V output of direct current by first capacitor C 1.Wherein the effect of second capacitor C 2 and resistance R is when producing high-tension pulse moment, is 2 chargings of second capacitor C, protects the second diode D2.When the upper end L5 at the upper end of the first secondary inductance coil L4 and the second secondary inductance coil is connected to ceramic gold-halogen lamp, can utilize the pressure reduction of positive 300V and negative 300V to come to charge to electric capacity, lamp is started light thereupon, can power for lamp by negative voltage afterwards.
Owing to increased the relative voltage stabilizing didoe WD and the first diode D1 of negative pole that link to each other successively at the two ends of former limit inductance coil, thereby played the effect of overvoltage protection, again owing to make the secondary inductance coil have two, can produce positive voltage and negative voltage simultaneously, make the first secondary inductance coil produce the positive voltage of 300V, make the second secondary inductance coil produce the negative voltage of 300V, thereby produce the pressure reduction of 600V, when for example using ceramic gold-halogen lamp, lamp can be lighted; When the lamp operate as normal, adopt negative voltage to power.
Above embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection range of claims of the present utility model.
Claims (8)
1. inverse-excitation type transformer, comprise switching tube (Q1), former limit inductance coil (L3) and secondary inductance coil (L4, L5), described former limit inductance coil (L3) is coupled with described secondary inductance coil, described former limit inductance coil one termination has direct current, the other end is by described switching tube (Q1) ground connection, it is characterized in that, described secondary inductance coil is the first secondary inductance coil (L4) and the second secondary inductance coil (L5), be connected to the 3rd diode (D3) and the 4th electric capacity (C4) between one end of the described first secondary inductance coil (L4) and the ground successively, be connected with voltage output end between described the 3rd diode (D3) and the 4th electric capacity (C4), the other end of the described first secondary inductance coil (L4) connects ground; The described second secondary inductance coil (L5) end connects another voltage output end, be parallel with load (R1) and first electric capacity (C1) between described another voltage output end and the ground, forward is connected with second diode (D2) between the other end of the described second secondary inductance coil (L5) and the ground.
2. inverse-excitation type transformer according to claim 1 is characterized in that, is parallel with voltage stabilizing didoe (WD) first diode (D1) relative with negative pole of series connection successively between described former limit inductance coil (L3) and the described switching tube (Q1).
3. inverse-excitation type transformer according to claim 2 is characterized in that, the described first secondary inductance coil (L4) is relative with the second secondary inductance coil (L5) end of the same name.
4. inverse-excitation type transformer according to claim 3 is characterized in that, is parallel with the 3rd electric capacity (C3) between the drain electrode of described switching tube (Q1) and source electrode.
5. inverse-excitation type transformer according to claim 4 is characterized in that, described second diode (D2) is parallel with second electric capacity (C2) and the resistance (R) of series connection successively.
6. inverse-excitation type transformer according to claim 5 is characterized in that, the described first secondary inductance coil (L4) is 1: 1 with the transformer ratio of described former limit inductance coil (L3); The described second secondary inductance coil (L5) is 1: 1 with the transformer ratio of described former limit inductance coil (L3).
7. inverse-excitation type transformer according to claim 6 is characterized in that, described switching tube (Q1) is the switch mosfet pipe.
8. inverse-excitation type transformer according to claim 7 is characterized in that, is added with the direct voltage of 300V on the described former limit inductance coil (L3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820184170XU CN201355571Y (en) | 2008-12-30 | 2008-12-30 | Flyback transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820184170XU CN201355571Y (en) | 2008-12-30 | 2008-12-30 | Flyback transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201355571Y true CN201355571Y (en) | 2009-12-02 |
Family
ID=41411914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820184170XU Expired - Fee Related CN201355571Y (en) | 2008-12-30 | 2008-12-30 | Flyback transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201355571Y (en) |
-
2008
- 2008-12-30 CN CNU200820184170XU patent/CN201355571Y/en not_active Expired - Fee Related
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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: 20091202 Termination date: 20141230 |
|
| EXPY | Termination of patent right or utility model |