TW521287B - Transformer circuit - Google Patents

Abstract

There is provided a transformer circuit suitable for an external circuit having a first level and a second level, which includes: a first winding having one end coupled to the first level for generating a first sensitive electromotive force; a demagnetization control circuit switch coupled between the other end of the first winding and the second level for switching the current passing through the first winding based on switch signals provided by the external circuit; a demagnetization circuit coupled between the other end of the first winding and the first level for consuming the energy remained on the first winding when the demagnetization control circuit switch is off; and a second winding having one end coupled to the second level for generating a signal having a second sensitive electromotive force based on the first sensitive electromotive force.

Description

521287 V. Description of the invention (1) The present invention relates to a transformer circuit, in particular, it can improve the electromagnetic wave interference (EMI) & response should there be a kind of double-state circuit.

The flyback transformer is a guide in a computer monitor or TV set. I: τ Apple: an important component-a band that can be used to strengthen the horizontal deflection loop required by the image tube = BA ,. The voltage. Most i-visions now have an external power supply. When the voltage is 110 volts! After entering the thin age ’, the voltage is separated by the transformer, the basic voltage is used for I p switching action, and the other part is sent to the flyback transformer 3 | upper system. I hate a A π > and Wenfa 35. The voltage transmitted to the flyback converter is low, and the horizontal scanning frequency of the end-view monitor — after the transformer has combined the horizontal input voltage and the DC voltage, the voltage can be increased by 250,000 to 2800 volts. = = Heating, so that the internal phosphor powder emits light, the horizontal scanning book THJ 〇4 — The circuit structure of the traditional flyback transformer will be described below. Spring diagram, Figure 1 shows the circuit structure of the traditional flyback transformer / shows the AC power supplied by the external power supply through the port: (not shown) after 4 treatments, it is converted into a straight q% t, and consider the wave power j WMHU -Winding 1 () (also called the main winding) and the first winding 10 of the transformer. Another _ 媳 鳊 ΙϋΛ circuit switch 15 (here N-type metal-oxygen semi-electrical perch M ^ Electric sun and sun body Li os is Example) the source.萁 In addition, the demagnetization control circuit switch 15 is closed! ρ Λ γ and w < 15 1 Α series receive external south frequency signals shaken by other circuits (such as the age of crying from the horizontal scanning data signal, the 7 # wish state, and the work # 极 1 5B series is coupled to the ground potential. Therefore, it can be used to change the dry level of the high-frequency signal from the external high-frequency signal, which can quickly demagnetize the multi-conductor ii t ^ control circuit switch 15 to switch on and on. Non-conducting state. Please turn on and off the magnetic control circuit:

521287 V. Description of the invention (2) 31 causes the current flowing in the first winding 10 of the transformer to produce s ^ ^. With the change of the above current, the magnetic flux I of the first winding resistance of 10 is generated. The magnetic energy is generated, and this magnetic energy will be transferred to the first of the transformer, so as to be trapped in the second winding. 1 2 A high-frequency pulse wave t is obtained due to induction. A two-frequency pulse wave voltage is rectified by an output diode 14 and an output voltage 2 ^ After the power source is low-wave, it can be converted into a DC power supply as other electrical power. In the design of transformers, it is necessary to avoid the generation of unnecessary electromagnetic waves. The so-called electromagnetic interference refers to a kind of electromagnetic wave noise containing electronic motor parts, which is generated during operation, or a signal that is not needed by the device, through radiation or conduction. This affects the operation of the direct device, causing abnormal operation or distortion of other devices. ^ Yes, he, however, the design of the traditional flyback transformer will cause electromagnetic interference ^ The reason is that in the traditional flyback transformer circuit, the magnetic energy generated by the first-winding resistance 〇 cannot be completely transferred to the second winding of the transformer 12. When the switch is not turned on, the remaining magnetism of the first winding 10 is left in the first winding 10 because there is no other path to leave. This residual remains in the transformer, which will cause the problem of EMI. In view of this, in order to solve the above problem, the present invention provides a transformer circuit capable of consuming less than 2 when the magnetic control loop switch is not conductive when the first winding has ^. Although the residual energy is eliminated, the purpose of demagnetization is achieved, And effectively suppress the first remaining resistance. Effectively solve the problem of electromagnetic interference caused by transformer interference when the switch is not conducting in the traditional technology; it is in the degaussing control circuit.

0506-6215TWf; MTC90-013; ROBERT.ptd Page 5

Graphic description l Figure 1 shows the circuit structure of a traditional flyback transformer. Fig. 2 shows a circuit structure of a flyback transformer according to an embodiment of the present invention. σ < Symbol description: 1 0, 2 0 ~ ^^ th winding

0506-6215TWf; MTC90-013; ROBERT.ptd page 6 521287 Description of the invention (4) 10A, 10B, 20A, Ichigo > ~ 14 ends of the first winding 15 ~ output pole 15A, 25B gate 1 6 ~ Output capacitor 21A ~ No.--Positive terminal 22 ~ 'Degaussing coil 25 ~' Degaussing control circuit open 24 ~ / Rectification crossing circuit 27A ~ Second positive terminal 28 ~ Output capacitor Ssw ~ Switching signal 1 2, 2 6 ~ Second winding 1 5 ~ Degaussing control circuit switch 1 5 B, 2 5 C ~ Drain 21 ~ First diode 21B ~ First negative terminal 2 3 ~ Degaussing circuit 2 5 A ~ Source 26A 27 ~ Second Diode 27B ~ The second negative electrode terminal DC ~ the positive potential terminal 26B ~ the two ends of the second winding Example: The electrical structure of the transformer according to the embodiment of the present invention will be described below. The transformer circuit according to the present invention is a flyback transformer circuit. Referring to the factory diagram, FIG. 2 shows the structure of the flyback transformer circuit according to the embodiment of the present invention. < As shown in FIG. 2, the flyback circuit according to the embodiment of the present invention includes a first winding 20, and one terminal 20A of the first winding is coupled to a positive potential terminal. (DC). This positive potential terminal receives DC power from an external power source. This DC power supply is generally obtained by converting the AC power supply through a general rectification and filtering circuit (not shown). Degaussing control circuit switch 25 (here N-type metal-oxide semiconductor NMOS is used as

521287 V. Description of the invention (5) Example) The source terminal 25A of the above NMOS transistor is coupled to the other end 20B of the first winding 20; the drain terminal 25C is coupled to the ground potential, and the degaussing control circuit switch 2 5 gate extreme 2 5 B is coupled to the switching wide number Ssw provided by the external circuit. The above-mentioned switching signal Ssw is a high-frequency signal, such as a monitor% horizontal scanning signal. The switch of the degaussing control circuit switch 25 can be controlled by the switching signal Ssw. For example, when the switching signal Ssw is high, the magnetic control circuit switch 25 is turned on, and when the switching signal Ssw is changed to a low level / month, the degaussing control circuit switch 25 is not turned on. The Guang / Xiao magnetic circuit 23 is connected between the other end 200b of the first winding 20 and the first level, and includes the first diode 21 and the degaussing coil 22. ^ The first unipolar body 21 has a first positive terminal 2 and a first 21B. The first positive terminal 21A is coupled to the other end 2 of the first winding 20. The element characteristic of the H diode is such that current can only be input through its first positive terminal Z 1 A. One end of the degaussing coil 22 ′ is coupled to -_A of the first negative terminal m to the first winding resistance 20. This degaussing coil 22 is capable of outputting a current output from the first negative terminal 21B of a pole body 21. The second winding 26, one end 26A of the second winding 26 is set to 1 so that it can output an AC / signal with a specific voltage value to the ground electric rectification filter circuit 24 including the second diode 27 and the output power plant 6 The output signal is filtered and rectified to output a DC signal with a special voltage value. The second diode 27 has a second positive electrode 27B, and the second positive electrode 27B is coupled to the second positive winding 27A of the second positive electrode terminal 27A of the single electrode 27

0506-6215W * C90-013; ROBERT.ptd page 8 521287 5. The other end of the invention description (6) 26B. The output capacitor 28 is coupled to the second negative terminal 27B and the second winding terminal 26A. The circuit operation of the flyback transformer according to the embodiment of the present invention will be described below. As shown in FIG. 2, when the degaussing control circuit switch 25 is turned on, the current provided by the direct current power source DC will start to flow through the first winding 20 through the terminal 20A of the first winding 20. Since the current flowing through the first winding 20 is gradually increased at this time, an induced electromotive force will be generated at both ends of the first winding 20, and the voltage level of 20A at one end of the first winding 20 is higher than that at the other end 20. b. ^ At the same time, because the second winding 26 is coupled to the first winding 20, the energy stored in the first winding 20 is transferred to the second winding 26. Therefore, an induced electromotive force is generated at both ends of the second winding 26, in which the voltage level at one end 268 of the second winding 26 is higher than the other end 26B. At the same time, due to the current-limiting characteristics of the diode 21, the direct-current power supply DC does not flow through the degaussing coil 22 and causes unnecessary energy loss. When the degaussing control circuit switch 25 is not turned on, the DC power supply no longer supplies current to the first winding 20. At this time, the current flows from one end 26A of the second winding 26 to the other end 26B, and the output capacitor 28 is charged through the second diode 27 ', so that the energy stored in the output capacitor 28 is gradually increased. As described above, the first winding 20 is the winding 20. Therefore, when the energy of the demagnetization control winding 20 is input from the first diode to the first diode 21, the energy of the electromagnetic wave interference generated by the above-mentioned remaining in the first winding 2 will be consumed. I cannot be completely transferred to When the second switch 25 is not conductive, it is left at the positive terminal 21A input of the first body 21 and passes through the magnetic coil 22. At this time, the amount of the degaussing coil 22 is large. Make it the first winding 20. In this embodiment, by degaussing 521287

Coil 22 can be demagnetized or its impedance is very small. Noise can be mentioned without noise. purpose. The reason is that the high resistance value of the flyback transformer will be reduced, and the low-frequency signal efficiency of the magnetic coil 22 will be effectively eliminated. At high frequencies, electromagnetic wave interference will be caused by the remaining energy of the transformer winding resistance to achieve demagnetization. instrument. It also solves the problem that the electromagnetic wave circuit generated when the circuit switch is not conductive in the conventional technology is enough to consume the remaining purpose of the first ’to effectively suppress radiated interference and change the circuit of the converter to eliminate interference in the demagnetization control. Although the present invention is disclosed in the preferred embodiment as above, the scope of the present invention, any person skilled in the art, is used to limit the spirit and scope, and can be done a little ^ from the scope of the present invention as attached The application of this application is subject to the definition of the profit-seeking target range of the present invention.

Claims (1)

521287 Leap years _! / Year f month—Amendment No. 901 coffee 6. Application for patent scope 1. A transformer circuit, suitable for and standard external power supply, including ··, /, first level and second level, used to Product 1-Description 3: One end of the winding is connected to the above-mentioned first eldest brother-induced electromotive force; and above: ί: =] = ON :, connected to the other-end of the above-winding resistance and , The switching is provided through the switching signal and degaussing circuit provided by the first road, coupled between the first planting level, when the degaussing is controlled back; and the first energy remaining in the first winding; and When the switch is non-conducting, a second winding resistance is consumed. The second level is used to signal from the first terminal i to the second electromotive force according to the first terminal i. ~ M potential to have a second induction 2 · A rectifier filter circuit as described in item j of the scope of the patent application, which is used to block the circuit as a circuit, and also includes a signal. ^ And 遽 3 of the second induced electromotive force described above. The degaussing circuit described in item 丨 of the patent application scope includes: a steal circuit, wherein the first first diode has one end, and the first -positive The extreme end is coupled to ::: = and -th-negative-degaussing coil, the above-mentioned degaussing coil ::: the other-end; the negative end, and the other cake of the degaussing coil is coupled to the first one, It is used to dissipate the energy coupled to the first winding by the first- 糸 coupling. The first page of the above received by a polar body 0506-6215TWFl; MTC90-013; ROBERT.ptc 521287 _Case No. 90118741_ Year Month and Amendment _ 6. Scope of patent application 4. As described in item 3 A transformer circuit, wherein the above-mentioned rectifying and filtering circuit includes: a second diode having a second positive terminal and a second negative terminal, and the second positive terminal is coupled to the other end of the second winding. ; And an output capacitor, coupled to the second negative terminal and one of the second windings. v 5. The transformer circuit according to item 1 of the scope of patent application, wherein the transformer circuit is a flyback transformer circuit. 6. The transformer circuit according to item 1 of the scope of patent application, wherein the external power source is DC power. _ 7. The transformer circuit according to item 1 of the scope of patent application, wherein the degaussing control loop switch is an NMOS transistor. 8. The transformer circuit according to item 1 of the scope of patent application, wherein the switching signal is a high-frequency signal. 9. The transformer circuit according to item 7 of the scope of patent application, wherein the switching signal is a horizontal scanning signal of a monitor. 10. The transformer circuit according to item 1 of the scope of patent application, wherein the first level of the external power source is a positive potential. 11. The transformer circuit according to item 1 of the scope of patent application, wherein the second level of the external power source mentioned above is the ground potential. 0506-6215TWFl; MTC90-013; ROBERT.ptc Page 12