CN215897322U - Transformer charging circuit and terminal - Google Patents
Transformer charging circuit and terminal Download PDFInfo
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- CN215897322U CN215897322U CN202121382377.XU CN202121382377U CN215897322U CN 215897322 U CN215897322 U CN 215897322U CN 202121382377 U CN202121382377 U CN 202121382377U CN 215897322 U CN215897322 U CN 215897322U
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Abstract
The embodiment of the application discloses transformer charging circuit and terminal, transformer charging circuit includes power, chip circuit, transformer circuit, charging circuit, still includes load circuit, load circuit includes first diode, first load resistance and second load resistance, wherein: the chip circuit is connected with the power supply and is also connected with the transformer circuit and one end of the second load resistor, the first output end of the transformer circuit is connected with one end of the first load resistor, one end of the second load resistor and one end of the charging circuit, the second output end of the transformer circuit is connected with the other end of the second load resistor of the load circuit and is grounded, the anode of the first diode is connected with the power supply, and the other end of the charging circuit is connected with the power supply. By adopting the embodiment of the application, the transformer winding can be prevented from being blown when the transformer winding is tested by safety short circuit.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a transformer charging circuit and a terminal.
Background
At present, in the safety certification of products, open circuit and short circuit tests need to be performed on all devices of the products, wherein transformer windings are also included. When a transformer winding is tested in a safety short circuit, all energy of a constant current starting circuit carried by a chip is loaded on the short-circuited winding, but the transformer winding is limited by space and generally adopts thinner wires, so that the normal working current ratio of the transformer winding is smaller, and therefore, if the transformer winding is not protected in time, the current flowing through the transformer winding is larger than the normal working current of the transformer winding, the temperature of the transformer winding is continuously increased, and the transformer winding is blown.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a transformer charging circuit and a terminal, which can avoid that when a transformer winding is tested by safety short circuit, the current flowing through the winding is too large, so that the winding is blown. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a transformer charging circuit, the transformer charging circuit includes a power supply, a chip circuit, a transformer circuit, and a charging circuit, and is characterized in that, the transformer charging circuit further includes a load circuit, the load circuit further includes a first diode, a first load resistor, and a second load resistor, where:
the power supply is connected with the input end of the chip circuit, the output end of the chip circuit is respectively connected with the first input end, the second input end and one end of the second load resistor of the transformer circuit, the first output end of the transformer circuit is connected with one end of the first load resistor, one end of the second load resistor and one end of the charging circuit, the second output end of the transformer circuit is connected with the other end of the second load resistor and grounded, the other end of the first load resistor is connected with the negative electrode of the first diode, the positive electrode of the first diode is connected with the power supply and the chip circuit, and the other end of the charging circuit is connected with the power supply and the chip circuit.
In a second aspect, the present application provides a terminal, where the terminal includes the above-mentioned transformer charging circuit.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
the embodiment of the application provides a transformer charging circuit includes power, chip circuit, transformer circuit, charging circuit, transformer charging circuit still includes load circuit, load circuit still includes first diode, first load resistance and second load resistance, wherein: the power supply is connected with the input end of the chip circuit, the output end of the chip circuit is respectively connected with the first input end, the second input end and one end of the second load resistor of the transformer circuit, the first output end of the transformer circuit is connected with one end of the first load resistor, one end of the second load resistor and one end of the charging circuit, the second output end of the transformer circuit is connected with the other end of the second load resistor and grounded, the other end of the first load resistor is connected with the negative electrode of the first diode, the positive electrode of the first diode is connected with the power supply and the chip circuit, and the other end of the charging circuit is connected with the power supply and the chip circuit. The added first load resistor RX1 and the second load resistor RX2 in the load circuit share part of the voltage of the power supply served by the constant current starting circuit carried by the chip, so that the voltage distributed by the chip is smaller than the minimum working voltage of the chip, the chip stops outputting the voltage to the transformer, the transformer stops working, the temperature of the transformer winding cannot rise, and the transformer winding is prevented from being blown.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a transformer charging circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a chip circuit provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a transformer circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a charging circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a transformer charging circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present application, it is noted that, unless explicitly stated or limited otherwise, "including" and "having" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Embodiments of the present application provide that the transformer charging circuit may be applied in terminals including, but not limited to: televisions, tablets, wearable devices, and other processing devices connected to a liquid crystal display, and the like. The added load resistor in the load circuit of the transformer charging circuit shares a part of voltage of the power supply acted by the chip self-provided constant current starting circuit, so that the voltage distributed by the chip is smaller than the minimum working voltage of the chip, the chip stops outputting the voltage to the transformer, and the transformer stops working, so that the temperature of the transformer winding cannot rise, and the transformer winding is prevented from being burnt out.
The present application will be described in detail with reference to specific examples.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a transformer charging circuit 1 proposed in the present application, the transformer charging circuit includes a power supply 10, a chip circuit 20, a transformer circuit 30, and a charging circuit 40, the transformer charging circuit further includes a load circuit 50, the load circuit 50 further includes a first diode D1, a first load resistor RX1, and a second load resistor RX2, wherein:
the input end of the chip circuit 20 is connected to the power supply 10, the output end of the chip circuit 20 is respectively connected to the first input end, the second input end of the transformer circuit 30 and one end of the second load resistor RX2, the first output end of the transformer circuit 30 is connected to one end of the first load resistor RX1, one end of the second load resistor RX2 and one end of the charging circuit 40, the second output end of the transformer circuit 30 is connected to the other end of the second load resistor RX2 and grounded, the other end of the first load resistor RX1 is connected to the negative electrode of the first diode D1, the positive electrode of the first diode D1 is connected to the power supply 10, the power management pin of the chip and one end of the third capacitor D3, and the other end of the charging circuit 40 is connected to the power supply 10, VCC, and one end of the charging circuit D3, And a power management pin VCC of the chip is connected with one end of the third capacitor D3.
When the transformer circuit 30 is subjected to an ampere short circuit test, the transformer circuit 30 is short-circuited, based on the characteristics of the chip circuit 20, a constant current starting circuit carried by the chip circuit is used as the power supply 10, the power supply 10 distributes the voltage of the power supply 10 to the chip circuit 20 and a first load resistor RX1 and a second load resistor RX2 in the load circuit 50, so that the voltage distributed by the chip circuit 20 is smaller than the minimum working voltage of the chip circuit 20, and the chip circuit 20 stops outputting the voltage to the transformer circuit 30, so that the transformer circuit 30 stops working.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a chip circuit provided in the present application, where the chip circuit 20 includes a chip U, a second diode D, a third diode D, a fourth diode D, a fifth diode D, a sixth diode D, a first resistor R, a second resistor R, a third resistor R, a fourth resistor R, a fifth resistor R, a sixth resistor R, a seventh resistor R, an eighth resistor R, a ninth resistor R, a tenth resistor R, an eleventh resistor R, a twelfth resistor R, a thirteenth resistor R, a fourteenth resistor R, a fifteenth resistor R, a sixteenth resistor R, a seventeenth resistor R, an eighteenth resistor R, a nineteenth resistor R, a twentieth resistor R, a twenty-first resistor R, a first capacitor C, a second capacitor C, a third capacitor C, a fourth capacitor C, a fifth capacitor C, a sixth capacitor C, a seventh capacitor C, a fifth capacitor C, a sixth capacitor C, a fifth capacitor R, a sixth resistor R, a seventh resistor R, a tenth resistor R, a twelfth resistor R, a tenth resistor R, a twelfth resistor R, a thirteenth resistor R, a tenth resistor R, a thirteenth resistor R, a tenth capacitor C, a sixth capacitor C, a fourth capacitor C, a sixth capacitor C, a fourth capacitor C, a fourth capacitor C, a fourth capacitor C, a capacitor C, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a first photocoupler PC1, and a second photocoupler PC2, wherein a voltage detection pin VSEN of the chip is connected to one end of the first capacitor C1, one end of the fifth resistor R5, one end of the fourth resistor R4, and a negative electrode of the second photocoupler PC2, the other end of the first capacitor C1 is connected to the other end of the fifth resistor R5 and grounded, the other end of the fourth resistor R4 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to a negative electrode of the second diode 2, the positive electrode of the second photocoupler PC2 is connected to one end of the twenty-first resistor R21.
The power management pin VCC of the chip U1 is connected to one end of the third capacitor C3, the power supply 10, and the anode of the first diode D1 in the load circuit 50, respectively.
The other end of the third capacitor C3 is connected to a negative electrode of the first photocoupler PC1, one end of the sixth resistor R6, one end of the fourth capacitor C4, one end of the seventh resistor R7, one end of the eighth resistor R8, one end of the fifth capacitor C5, one end of the sixth capacitor C6, one end of the eighth capacitor C8, one end of the seventh capacitor C7, one end of the eleventh resistor R11, one end of the twelfth resistor R12, one end of the fourteenth resistor R14, and one end of the ninth capacitor C9, and is grounded, respectively, the positive electrode of the first photocoupler PC1 is connected to one end of the second capacitor C3 and the feedback pin FB of the chip U1, and the other end of the sixth resistor R6 is connected to the other end of the second capacitor C2.
The other end of the fourth capacitor C4 is connected to the other end of the seventh resistor R7 and the adjustment pin ADJ of the chip U1, respectively.
The other end of the fifth capacitor C5 is connected to the other end of the eighth resistor R8 and the fifth pin CSS of the chip U1, respectively.
The other end of the sixth capacitor C6 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to the clock input pin CL of the chip U1.
The other end of the seventh capacitor C7 is connected to the other end of the eleventh resistor R11, the other end of the twelfth resistor R12, one end of the tenth resistor R10, and the oscillation pin RC of the chip U1.
The other end of the eighth capacitor C8 is connected to the eighth pin PL of the chip U1.
The other end of the ninth capacitor C9 is connected to one end of the thirteenth resistor R13 and the standby pin SB of the chip U1, the other end of the thirteenth resistor R13 is connected to the cathode of the sixth diode D6, and the anode of the sixth diode D6 is connected to the other end of the fourteenth resistor R14 and one end of the fifteenth resistor R15.
The other end of the fifteenth resistor R15 is connected to one end of the first load resistor RX1 in the load circuit 50, one end of the second load resistor RX2, and the first output terminal in the transformer circuit 30.
One end of the C10 of the tenth capacitor is connected to the ground pin GND of the chip U1 and grounded.
The other end of the tenth capacitor C10 is connected to the anode of the fifth diode D5, the other end of the twenty-first resistor R21, and the reference voltage input pin REG of the chip U1, respectively, and the cathode of the fifth diode D5 is connected to one end of the sixteenth resistor R16.
The other end of the sixteenth resistor R16 is respectively connected to the fourteenth pin VB of the chip U1, one end of the eleventh capacitor C11, and the cathode of the fourth diode D4.
The other end of the eleventh capacitor C11 is connected to the anode of the fourth diode D4 and the fifteenth pin VS of the chip U1, respectively.
A positive power input pin VGH of a Thin Film Transistor (TFT) panel of the chip U1 is connected to a first input terminal of the transformer circuit 30.
The negative power input pin VGL of the TFT panel of the chip U1 is connected to the second input terminal of the transformer circuit 30.
One end of the nineteenth resistor R19 is connected to one end of the seventeenth resistor R17, one end of the twelfth capacitor C12 and the eighteenth pin ST of the chip U1, the other end of the nineteenth resistor R19 is connected to one end of the twentieth resistor R20, the other end of the seventeenth resistor R17 is connected to one end of the eighteenth resistor R18, the other end of the twentieth resistor R20 is connected to the cathode of the third diode D3, the other end of the eighteenth resistor R18 is connected to the other end of the first resistor R1 and the cathode of the second diode D2, the other end of the twelfth capacitor C12 is connected to one end of the thirteenth capacitor C13, and the other end of the thirteenth capacitor C13 is grounded.
As shown in fig. 3, fig. 3 is a schematic structural diagram of a transformer circuit proposed in the present application, where the transformer circuit 30 includes a transformer T1 composed of a primary winding, a first secondary winding, and a second secondary winding, a first fet Q1, a second fet Q2, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a seventh diode D7, an eighth diode D8, and a ninth diode D9, where one end of the fifteenth capacitor C15, a head end of the primary winding, a head end 1 of the first resistor C24, a second resistor R1, and a fourteenth end of the first fet Q24 are connected to the first capacitor C15, One end of the sixteenth capacitor C16, the D-terminal of the second fet Q2, the other end of the eleventh capacitor C11, the anode of the third diode D3 and the fifteenth pin VS of the chip are connected, the other end of the fifteenth capacitor C15 is connected to one end of the fourteenth capacitor C14, and the other end of the fourteenth capacitor C14 is connected to the D-terminal of the first fet Q1.
One end of the twenty-second resistor R22 is connected to one end of the twenty-third resistor R23, the other end of the twenty-fourth resistor R24, and the G end of the first field-effect transistor Q1, the other end of the twenty-third resistor R23 is connected to the anode of the seventh diode D7, the other end of the twenty-second resistor R22 is connected to the cathode of the seventh diode D7 as the first input terminal AHO1 of the transformer, and the first input terminal AHO1 is connected to the positive power input pin VGH of the TFT panel of the chip.
The other end of the sixteenth capacitor C16 is connected to one end of a seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is connected to one end of the twenty-seventh resistor R20, one end of the eighteenth capacitor C18, one end of the nineteenth capacitor C19, and the S-terminal of the second fet Q2, and is grounded, and the other end of the eighteenth capacitor C18 is connected to the other end of the nineteenth capacitor C19 and the terminal 4 of the primary winding.
One end of the twenty-fifth resistor R25 is connected to one end of the twenty-sixth resistor R26, the other end of the twenty-seventh resistor R27, and the G end of the second field effect transistor Q2, the other end of the twenty-sixth resistor R26 is connected to the anode of the eighth diode D8, the other end of the twenty-fifth resistor R25 is connected to the cathode of the eighth diode D8 to serve as the second input LO of the transformer, and the second input LO of the transformer is connected to the negative power input pin VGL of the TFT panel of the chip.
One end of the twenty-eighth resistor R28 is connected to one end of the twenty-ninth resistor R29 and the anode of the twentieth capacitor C20 respectively as the first output end 303 of the transformer circuit 30, the first output end 303 of the transformer circuit 30 is connected to one end of the first load resistor RX1, one end of the second load resistor RX2 and the other end of the fifteenth resistor R15 in the chip circuit 20 in the load circuit 50, the other end of the twenty-eighth resistor R28 is connected to the other end of the twenty-ninth resistor R29 and the cathode of the ninth diode D9 respectively, the anode of the ninth diode D9 is connected to the dotted terminal 5 of the head end of the primary winding in the first secondary winding, the cathode of the twentieth capacitor C20 is connected to the dotted terminal 6 of the tail end of the primary winding in the first secondary winding as the second output end 304 of the transformer circuit 30, the second output terminal 304 of the transformer circuit 30 is connected to the other end of the second load resistor RX2 in the load circuit 50 and grounded.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a charging circuit provided in the present application, where the charging circuit 40 includes a twenty-first capacitor C21, a twenty-second capacitor C22, and a twelfth diode D10, where an anode of the twelfth diode D10 is used as one end 401 of the charging circuit 40, and one end 401 of the charging circuit 40 is respectively connected to the other end of the fifteenth resistor R15, one end of the first load resistor RX1, one end of the second load resistor RX2, one end of the twenty-eighth resistor R28, one end of the twenty-ninth resistor R29, and an anode of the twentieth capacitor C20.
One end of the twenty-first capacitor C21 is connected to the anode of the twenty-second C22 capacitor and the cathode of the twelfth diode D10 as the other end 402 of the charging circuit 40, and the other end of the charging circuit 402 is connected to the power supply 10, the power management pin VCC of the chip, and one end of the third capacitor D3.
The other end of the twenty-first capacitor C21 is connected to the negative electrode of the twenty-second capacitor C22 and grounded.
The above circuits are connected to form a transformer charging circuit, as shown in fig. 5, the power management pin VCC of the chip circuit 20 is connected to the power supply 10, the positive power input pin VGH of the TFT panel of the chip circuit 20 is connected to the first input terminal AHO1 of the transformer circuit 30, the negative power input pin VGL of the TFT panel is connected to the second input terminal LO of the transformer circuit 30, the other end of the fifteenth resistor is connected to one end of the second load resistor RX2 of the load circuit 50, the first output terminal 303 of the transformer circuit 30 is connected to one end of the first load resistor RX1, one end of the second load resistor RX2, and one end 401 of the charging circuit 40 of the load circuit 50, the second output terminal 304 of the transformer circuit 30 is connected to the other end of the second load resistor RX2 of the load circuit 50 and grounded, the positive electrode of the first diode D1 of the load circuit 50 is connected to the power supply 10, the power management pin VCC of the chip and one end of the third capacitor D3, and the other end 402 of the charging circuit 40 is connected to the power supply 10, the power management pin VCC of the chip and one end of the third capacitor D3.
Specifically, when the transformer winding is subjected to an safety short-circuit test, the dotted terminal 5 at the head end of the primary winding in the first secondary winding is connected with the dotted terminal 6 at the tail end of the primary winding in the first secondary winding, a voltage V11 generated in a constant current starting circuit carried by the chip U1 serves as a voltage of the power supply 10, the chip U1 starts to work after being distributed to all the voltages V11, the voltage is distributed to the primary winding of the transformer T1, the generated voltage is distributed to the first secondary winding of the transformer T1 by the primary winding of the transformer T1, and the temperature of the first secondary winding of the transformer T1 rises due to the fact that the distributed voltage is too high and the current flowing through the first secondary winding of the transformer T1 is too high. The transformer charging circuit adds the load circuit 50, the load circuit 50 includes a first diode D1, a first load resistor RX1 and a second load resistor RX2, the first load resistor RX1 and the second load resistor RX2 in the load circuit 50 can distribute a part of the voltage of the power supply 10, so that the chip stops starting operation because the distributed voltage cannot reach the minimum operating voltage.
Specifically, when the transformer winding is subjected to an safety short-circuit test, the dotted terminal 5 at the head end of the primary winding in the first secondary winding is connected to the dotted terminal 6 at the tail end of the primary winding in the first secondary winding, because the chip is provided with a constant current starting circuit, the chip enables the constant current starting circuit provided by the chip U1 to serve as the power supply 10 through a power supply management pin VCC of the chip U1, the power supply 10 distributes a part of the voltage V21 of the voltage V11 generated in the constant current starting circuit provided by the chip U1 to the chip U1, and distributes the other part of the voltage V31 to the first load resistor RX1 and the second load resistor RX2 in the load circuit 50.
The power supply 10 is connected with the anode of the first diode D1 as the load circuit 50 and the cathode of the first diode D1 is connected with the first load resistor RX1, and another part of the voltage V31 is distributed to the other end of the fifteenth resistor R15 in the chip circuit 20, i.e., the VCC1 node, so that the voltage at the VCC1 node is V (VCC 23-1) at this time, a part of the voltage V31 is finally distributed to the first load resistor RX1 and the second load resistor RX2, when the first load resistor RX1 and the second load resistor RX2 are distributed to one part of the voltage V31, the voltage V21 distributed to the chip U1 through the power management pin VCC of the chip U1 is reduced, and by presetting the resistances of the first load resistor RX1 and the second load resistor RX2, the voltage V21 distributed to the chip U375 is smaller than the minimum working voltage of the chip U1, when the voltage V21 distributed by the chip U1 is less than the minimum operating voltage of the chip U1, that is, the voltage V21 distributed by the chip U1 is reduced to the critical voltage of the chip U1, since the undervoltage protection mechanism of the protection circuit is adopted, the connection line between the power supply 10 and the chip circuit 20 is cut off through a relay protection device or a device with similar function, so that the chip U1 stops starting operation, and further the chip U1 stops outputting voltage, that is, the chip U1 stops outputting the voltage to the transformer T1, which indicates that the chip U1 no longer outputs the voltage V21 to the first input terminal AHO1 of the transformer circuit 30 through the positive power supply input pin VGH of the TFT panel of the chip and outputs the voltage V2 to the second input terminal LO of the transformer circuit 30 through the negative power supply input pin VGL of the TFT panel of the chip U1, so that the transformer T1 stops working because there is no voltage input and no current flows through the transformer T1, and neither the head end 1 nor the tail end 4 of the primary winding is distributed to voltage nor current flows through the first secondary winding.
It can be understood that, when the transformer winding is short-circuited in an ampere rule, the voltage V1 of the power supply 10 is not distributed to the first load resistor RX1 and the second load resistor RX2 because the power supply 10 is connected to the negative electrode of the twelfth diode D10 in the charging circuit 40, the positive electrode of the twelfth diode D10 is connected to one end of the first load resistor RX1 and one end 2 of the second load resistor RX in the load circuit 50, and the diodes have unidirectional conductivity.
When the safety short-circuit testing transformer winding is finished, the dotted terminal 5 at the head end of the primary winding in the first secondary winding is disconnected from the dotted terminal 6 at the tail end of the primary winding in the first secondary winding, the chip circuit 20 in the transformer charging circuit is used as the power supply 10 due to the constant current starting circuit carried by the chip U1, the power supply 10 distributes a part of the voltage V21 of the voltage V11 generated in the constant current starting circuit carried by the chip U1 to the chip U1, the other part of the voltage V31 is distributed to the first load resistor RX1 and the second load resistor RX2 in the load circuit 50, after the power supply is turned on, when the voltage V22 distributed by the chip U1 is greater than the minimum working voltage of the chip, the chip U1 starts to work, and the chip U1 outputs a part of the voltage V22 to the first input terminal AHO1 of the transformer circuit 30 through the positive power supply input pin VGH of the TFT screen of the chip U1, and outputs a portion of the voltage V22 to the second input LO of the transformer circuit 30 through the negative power input pin VGL of the TFT panel of the chip U1, so that the head end 1 and the tail end 4 of the primary winding of the transformer T1 are distributed to the voltage V41, when the transformer T1 starts to operate, and the normal output voltage V51 of the first secondary winding of the transformer T1 is higher than the voltage V41 obtained from the head end 1 and the tail end 4 of the primary winding after the transformer T1 starts to operate, because the first output terminal 303 of the transformer circuit 30 is connected to one end of the first load resistor RX1 and one end of the second load resistor RX2 in the load circuit 50, the second output terminal 304 of the transformer circuit 30 is connected to the second load resistor RX2 of the load circuit 50 and to ground, so that the voltage V at the node VCC1 (VCC1-2) is higher than the voltage V12 of the power supply 10.
Because the node of VCC1 is connected to the anode of the diode D10 in the charging circuit 40, the cathode of the diode D10 is connected to the power supply 10, and because of the unidirectional conductivity of the diode, a part of the voltage V (VCC1-2) at the node of VCC1 is distributed to the power supply 10 through the diode D10 in the charging circuit 40 by the diode D10, so that the voltage of the power supply 10 at this time is changed to V13, and because the power supply 10 is connected to the power management pin VCC of the chip U1, the voltage of the chip U1 at this time is smaller than the voltage V13 of the power supply 10, so that the power supply 10 distributes a part of the voltage V13 of the power supply 10 to the chip circuit 20 through the power management pin VCC of the chip U1.
Since the other end of the fifteenth resistor in the chip circuit 20 is connected to one end of the first load resistor RX1 and one end of the second load resistor RX2 in the load circuit 50, a part of the voltage V (VCC1-2) at the VCC1 node is also distributed to the chip circuit 20 through the fifteenth resistor.
And finally, the transformer charging circuit forms a normal working loop.
In the embodiment of the application, a part of the voltage of the power supply, which is served by the chip self-provided constant-current starting circuit, is shared by the first load resistor RX1 and the second load resistor RX2 in the load circuit, so that the voltage distributed by the chip is smaller than the minimum working voltage of the chip, the chip stops outputting the voltage to the transformer, and the transformer stops working, so that the temperature of the transformer winding does not rise, and the transformer winding is prevented from being blown.
Embodiments of the present application further provide a terminal, which includes the above-mentioned transformer charging circuit. The terminal can be a television, a tablet computer, a wearable device, other processing device connected to a liquid crystal display screen, and the like. The terminal with the transformer charging circuit can share a part of voltage of the power supply which is used by the chip with the constant-current starting circuit through the added load resistor in the load circuit, so that the voltage distributed by the chip is smaller than the minimum working voltage of the chip, the chip stops outputting the voltage to the transformer, and the transformer stops working, so that the temperature of the transformer winding cannot rise, and the transformer winding is prevented from being burnt out.
The serial numbers of the embodiments in this application are for description only and do not represent the merits of the embodiments.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.
Claims (5)
1. The utility model provides a transformer charging circuit, transformer charging circuit includes power, chip circuit, transformer circuit, charging circuit, its characterized in that, transformer charging circuit still includes load circuit, load circuit still includes first diode, first load resistance and second load resistance, wherein:
the power supply is connected with the input end of the chip circuit, the output end of the chip circuit is respectively connected with the first input end, the second input end and one end of the second load resistor of the transformer circuit, the first output end of the transformer circuit is connected with one end of the first load resistor, one end of the second load resistor and one end of the charging circuit, the second output end of the transformer circuit is connected with the other end of the second load resistor and grounded, the other end of the first load resistor is connected with the negative electrode of the first diode, the positive electrode of the first diode is connected with the power supply, and the other end of the charging circuit is connected with the power supply.
2. The transformer charging circuit of claim 1, wherein the chip circuit comprises a chip, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a first photocoupler, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a eighth capacitor, a ninth capacitor, a tenth capacitor, a eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a first photocoupler, a second diode, a third diode, a fifth diode, a sixth diode, a fourth diode, a fifth resistor, a sixth resistor, a fifteenth resistor, a seventeenth resistor, a tenth resistor, a fifth resistor, a seventh resistor, a fifth resistor, a sixth resistor, a fifth resistor, a sixth resistor, a fifth capacitor, a fifth resistor, a fifth capacitor, a sixth resistor, a fifth capacitor, a fifth, A second photo-coupler, wherein:
a voltage detection pin of the chip is respectively connected with one end of the first capacitor, one end of the fifth resistor, one end of the fourth resistor and a cathode of the second photoelectric coupler, the other end of the first capacitor is connected with the other end of the fifth resistor and grounded, the other end of the fourth resistor is connected with one end of the third resistor, the other end of the third resistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the first resistor, the other end of the first resistor is connected with the cathode of the second diode, and the anode of the second photoelectric coupler is connected with one end of the twenty-first resistor;
a power management pin of the chip is respectively connected with one end of the third capacitor, the power supply and the anode of a first diode in the load circuit;
the other end of the third capacitor is respectively connected with a negative electrode of the first photoelectric coupler, one end of the sixth resistor, one end of the fourth capacitor, one end of the seventh resistor, one end of the eighth resistor, one end of the fifth capacitor, one end of the sixth capacitor, one end of the eighth capacitor, one end of the seventh capacitor, one end of the eleventh resistor, one end of the twelfth resistor, one end of the fourteenth resistor and one end of the ninth capacitor, and is grounded, the positive electrode of the first photoelectric coupler is respectively connected with one end of the second capacitor and the feedback pin of the chip, and the other end of the sixth resistor is connected with the other end of the second capacitor;
the other end of the fourth capacitor is connected with the other end of the seventh resistor and an adjusting pin of the chip respectively;
the other end of the fifth capacitor is connected with the other end of the eighth resistor and a fifth pin of the chip respectively;
the other end of the sixth capacitor is connected with one end of the ninth resistor, and the other end of the ninth resistor is connected with a clock input pin of the chip;
the other end of the seventh capacitor is connected with the other end of the eleventh resistor, the other end of the twelfth resistor, one end of the tenth resistor and the oscillation pin of the chip respectively;
the other end of the eighth capacitor is connected with an eighth pin of the chip;
the other end of the ninth capacitor is connected with one end of the thirteenth resistor and the standby pin of the chip respectively, the other end of the thirteenth resistor is connected with the cathode of the sixth diode, and the anode of the sixth diode is connected with the other end of the fourteenth resistor and one end of the fifteenth resistor respectively;
the other end of the fifteenth resistor is connected with one end of the first load resistor, one end of the second load resistor and a first output end of the transformer circuit in the load circuit;
one end of the tenth capacitor is connected with the grounding pin of the chip and is grounded;
the other end of the tenth capacitor is connected with the anode of the fifth diode, the other end of the twenty-first resistor and a reference voltage input pin of the chip respectively, and the cathode of the fifth diode is connected with one end of the sixteenth resistor;
the other end of the sixteenth resistor is connected with a fourteenth pin of the chip, one end of the eleventh capacitor and the negative electrode of the fourth diode respectively;
the other end of the eleventh capacitor is connected with the anode of the fourth diode and the fifteenth pin of the chip respectively;
a positive power supply input pin of a TFT screen of the chip is connected with a first input end of the transformer circuit;
a negative power supply input pin of a TFT screen of the chip is connected with a second input end of the transformer circuit;
one end of the nineteenth resistor is connected with one end of the seventeenth resistor, one end of the twelfth capacitor and the eighteenth pin of the chip respectively, the other end of the nineteenth resistor is connected with one end of the twentieth resistor, the other end of the seventeenth resistor is connected with one end of the eighteenth resistor, the other end of the twentieth resistor is connected with the negative electrode of the third diode, the other end of the eighteenth resistor is connected with the other end of the first resistor and the negative electrode of the second diode respectively, the other end of the twelfth capacitor is connected with one end of the thirteenth capacitor, and the other end of the thirteenth capacitor is grounded.
3. The transformer charging circuit of claim 2, wherein the transformer circuit comprises a primary winding, a first secondary winding, a second secondary winding, a first fet, a second fet, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a seventh diode, an eighth diode, and a ninth diode, wherein:
one end of the fifteenth capacitor, the head end of the primary winding, one end of the twenty-fourth resistor, the S end of the first field effect transistor, one end of the sixteenth capacitor, the D end of the second field effect transistor, the other end of the eleventh capacitor, the anode of the third diode, and the fifteenth pin of the chip are connected, the other end of the fifteenth capacitor is connected with one end of the fourteenth capacitor, and the other end of the fourteenth capacitor is connected with the D end of the first field effect transistor;
one end of the twenty-second resistor is connected with one end of the twenty-third resistor, the other end of the twenty-fourth resistor and the G end of the first field effect transistor respectively, the other end of the twenty-third resistor is connected with the anode of the seventh diode, the other end of the twenty-second resistor is connected with the cathode of the seventh diode to serve as a first input end of the transformer, and the first input end is connected with a positive power supply input pin of a TFT screen of the chip;
the other end of the sixteenth capacitor is connected with one end of a seventeenth capacitor, the other end of the seventeenth capacitor is respectively connected with one end of a twenty-seventh resistor, one end of an eighteenth capacitor, one end of a nineteenth capacitor and the S end of the second field effect transistor and is grounded, and the other end of the eighteenth capacitor is respectively connected with the other end of the nineteenth capacitor and the tail end of the primary winding;
one end of the twenty-fifth resistor is connected with one end of the twenty-sixth resistor, the other end of the twenty-seventh resistor and the G end of the second field effect transistor respectively, the other end of the twenty-sixth resistor is connected with the anode of the eighth diode, the other end of the twenty-fifth resistor is connected with the cathode of the eighth diode to serve as a second input end of the transformer, and the second input end is connected with a negative power supply input pin of the TFT screen of the chip;
one end of the twenty-eighth resistor is connected with one end of the twenty-ninth resistor and the positive electrode of the twentieth capacitor respectively to serve as a first output end of the transformer circuit, the first output end of the transformer circuit is connected with one end of the first load resistor, one end of the second load resistor and the other end of the fifteenth resistor in the chip circuit, the other end of the twenty-eighth resistor is connected with the other end of the twenty-ninth resistor and the negative electrode of the ninth diode respectively, the positive electrode of the ninth diode is connected with the end of the first end of the primary winding in the first secondary winding, the negative electrode of the twentieth capacitor is connected with the end of the first secondary winding in the same name end to serve as a second output end of the transformer circuit, and the second output end of the transformer circuit is connected with the other end of the second load resistor in the load circuit and grounded.
4. The transformer charging circuit of claim 3, wherein the charging circuit comprises a twenty-first capacitor, a twenty-second capacitor, and a twelfth diode, wherein:
an anode of the twelfth pole tube, which is taken as one end of the charging circuit, is connected to the other end of the fifteenth resistor, one end of the first load resistor, one end of the second load resistor, one end of the twenty-eighth resistor, one end of the twenty-ninth resistor, and an anode of the twentieth capacitor, respectively;
one end of the twenty-first capacitor is connected with the anode of the twenty-second capacitor and the cathode of the twelfth pole tube to serve as the other end of the charging circuit, and the other end of the charging circuit is connected with the power supply and the chip circuit;
the other end of the twenty-first capacitor is connected with the negative electrode of the twenty-second capacitor and grounded.
5. A terminal, characterized in that it comprises a transformer charging circuit according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121382377.XU CN215897322U (en) | 2021-06-21 | 2021-06-21 | Transformer charging circuit and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121382377.XU CN215897322U (en) | 2021-06-21 | 2021-06-21 | Transformer charging circuit and terminal |
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| Publication Number | Publication Date |
|---|---|
| CN215897322U true CN215897322U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121382377.XU Active CN215897322U (en) | 2021-06-21 | 2021-06-21 | Transformer charging circuit and terminal |
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| Country | Link |
|---|---|
| CN (1) | CN215897322U (en) |
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2021
- 2021-06-21 CN CN202121382377.XU patent/CN215897322U/en active Active
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