Power conversion circuit compatible with 9-36V direct current power input television

Abstract

The utility model discloses a power conversion circuit compatible with a 9-36V direct current power input television, which relates to the field of power conversion boards and comprises a chip IC1, a plurality of input ends, a plurality of output ends, a plurality of resistors, a plurality of capacitors, an MOS (metal oxide semiconductor) tube Q3, a diode D1, a diode ZD3, a triode Q4, a triode Q5, an MOS tube Q2, a diode ZD1, a triode Q1, a diode D2, a diode D3, a diode D4, an inductor L1 and a diode ZD2. According to the utility model, the liquid crystal display television can be compatible with 9-36V direct current power supply input, the direct current wide voltage requirement of the liquid crystal display television is met, the product lines are enriched, the product competitiveness is improved, and the mainboard is prevented from being damaged due to overhigh output voltage.

Description

Technical Field

[0001] This utility model relates to the field of power conversion boards, specifically, to a power conversion circuit that is compatible with 9-36V DC power input to a television. Background Technology

[0002] Televisions and monitors are both electronic devices used to display images and videos. In the mobile market, when a television or monitor itself does not have wide voltage input adaptability and needs to be connected to a power supply with different voltages, an external power adapter is required. Power adapters typically protect the device from unexpected power fluctuations.

[0003] Most televisions and monitors on the market generally support DC 12V voltage by default. To meet the needs of the mobile market, such as when customers use them with external batteries in vehicles or boats, the television can still operate normally even when the battery voltage fluctuates. Therefore, how to expand the voltage input range of the television by connecting an external power board through ports and cables without changing the PCB board of the general motherboard is a problem that urgently needs to be solved. Utility Model Content

[0004] In view of the problems in the related technologies, this utility model proposes a power conversion circuit that is compatible with 9-36V DC power input to televisions, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows:

[0006] A power conversion circuit compatible with 9-36V DC power input for televisions includes a chip IC1, input terminals CN2 and CN3, output terminals CN4 and CN5, a MOSFET Q3, resistors R6, R7, and R9, a fuse FS1, a diode D1, capacitors C1, C2, and C3, a diode ZD3, a resistor R13, transistors Q4 and Q5, resistors R12, C14, C4, R2, C5, R4, R15, and R16, a MOSFET Q2, a diode ZD1, resistors R3 and R5, resistors R1, a capacitor C6, a transistor Q1, and diodes D2, D3, and D4. The following components are connected in series: inductor L1, resistor R8, capacitors C7, C8, C9, resistors R10, R11, C10, C11, C15, C13, and diode ZD2. The eighth terminal of chip IC1 is connected sequentially to one end of capacitor C3, one end of capacitor C2, one end of capacitor C1, the cathode of diode D1, one end of fuse FS1, one end of resistor R7, one end of resistor R12, the cathode of diode ZD3, one end of capacitor C4, one end of resistor R2, one end of capacitor C5, one end of resistor R4, one end of resistor R15, the cathode of diode ZD1, and one end of resistor R1. The other end of fuse FS1 is connected to the third and fourth terminals of input terminal CN2. The input terminals CN2 and CN3 are connected as follows: the first and second terminals of CN2 are connected to the first and second terminals of CN3; the third and fourth terminals of CN3 are connected to one end of resistor R6 and the first terminal of MOSFET Q3; the other end of resistor R6 is connected sequentially to the third terminal of MOSFET Q3, the other end of resistor R7, and one end of resistor R9; the other end of resistor R9 is connected to the second terminal of MOSFET Q3; the anode of diode ZD3 is connected sequentially to one end of resistor R14 and one end of resistor R13; the other end of resistor R13 is connected to the third terminal of transistor Q4; the first terminal of transistor Q4 is connected sequentially to the other end of resistor R12, one end of capacitor C14, and the third terminal of transistor Q5; the transistor Q5... The first terminal is connected in sequence to the second terminal of chip IC1, the other end of resistor R1, and the first terminal of transistor Q1. The third terminal of transistor Q1 is connected in sequence to one end of capacitor C6 and one end of resistor R3. The other end of resistor R3 is connected in sequence to the positive terminal of diode ZD1 and one end of resistor R5. The other end of capacitor C4 is connected to the seventh terminal of chip IC1. The other end of resistor R2 is connected in sequence to the other end of capacitor C5 and the first terminal of chip IC1. The other end of resistor R15 is connected in sequence to the other end of resistor R4, the fifth terminal of chip IC1, and the first terminal of MOSFET Q2. The third terminal of MOSFET Q2 is connected to one end of resistor R16. The other end of resistor R16 is connected to the sixth terminal of chip IC1.The second terminal of MOSFET Q2 is connected in sequence to the cathodes of diodes D2, D3, and D4, one end of inductor L1, and one end of resistor R8. The other end of inductor L1 is connected in sequence to one end of capacitor C7, one end of capacitor C8, one end of resistor R10, one end of capacitor C10, one end of capacitor C11, one end of capacitor C15, one end of capacitor C13, the cathode of diode ZD2, and output terminals CN4 and CN5. The other end of resistor R8 is connected in sequence to the other end of capacitor C7 and one end of capacitor C9. The other end of capacitor C9 is connected in sequence to the third terminal of chip IC1, the other end of capacitor C8, the other end of resistor R10, and one end of resistor R11.

[0007] Furthermore, the first and second terminals of output terminal CN4 are connected to the first and second terminals of output terminal CN5, and are also connected to the negative terminal of diode ZD2.

[0008] Furthermore, the third terminal of output terminal CN4 is connected to the third terminal of output terminal CN5, and the fourth terminal of output terminal CN4 is connected to the fourth terminal of output terminal CN5.

[0009] Furthermore, the first terminal of MOSFET Q3 is the drain, the second terminal of MOSFET Q3 is the source, and the third terminal of MOSFET Q3 is the gate.

[0010] Furthermore, the first terminal of MOSFET Q2 is the source, the second terminal of MOSFET Q2 is the drain, and the third terminal of MOSFET Q2 is the gate.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention, through a power chip and auxiliary circuitry, enables LCD TVs to be compatible with 9-36V DC power input, solving the wide DC voltage requirement of LCD TVs, enriching the product line, and enhancing product competitiveness. Within the 9V-36V voltage range, this invention can stably output 12V to power the TV normally; when the front-end voltage (9V) is lower or higher than 36V, the output is cut off to protect chip IC1; a 15V protection diode is provided at the output port to prevent damage to chip IC1 and to avoid damage to the mainboard due to excessively high output voltage. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1This is one of the circuit diagrams of a power conversion circuit compatible with 9-36V DC power input to a television, according to an embodiment of the present utility model.

[0015] Figure 2 This is a second circuit diagram of a power conversion circuit compatible with 9-36V DC power input to a television, according to an embodiment of the present utility model.

[0016] Figure 3 This is the third circuit diagram of a power conversion circuit compatible with 9-36V DC power input to a television, according to an embodiment of the present utility model.

[0017] Figure 4 This is the fourth circuit diagram of a power conversion circuit compatible with 9-36V DC power input to a television, according to an embodiment of the present utility model.

[0018] Figure 5 This is a PCB layout of a power conversion circuit for a television compatible with 9-36V DC power input, according to an embodiment of the present invention.

[0019] Figure 6 This is a connection block diagram according to an embodiment of the present utility model. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0021] According to an embodiment of this utility model, a power conversion circuit compatible with 9-36V DC power input for televisions is provided. A small power conversion board compatible with 9-36V is added to a traditional DC 12V television to achieve a wide voltage input range.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-6 As shown, Figure 1 Line segments ①, ②, ③, and ④ in the diagram are respectively connected to... Figure 2 Connect line segments ①, ②, ③, and ④ in the diagram. Figure 2 Line segment ⑤ and Figure 3The line segment ⑤ in the diagram represents a power conversion circuit compatible with 9-36V DC power input for televisions, according to an embodiment of this utility model. It includes a chip IC1, input terminals CN2 and CN3, output terminals CN4 and CN5, a MOSFET Q3, resistors R6, R7, and R9, a fuse FS1, a diode D1, capacitors C1, C2, and C3, a diode ZD3, a resistor R13, transistors Q4 and Q5, resistors R12, C14, C4, R2, C5, R4, R15, and R16, a MOSFET Q2, a diode ZD1, resistors R3 and R5, resistors R1, a capacitor C6, a transistor Q1, and a diode D1. 2. Diodes D3 and D4, inductor L1, resistor R8, capacitors C7, C8, and C9, resistors R10 and R11, capacitors C10, C11, C15, and C13, and diode ZD2; wherein, the eighth terminal of chip IC1 is connected sequentially to one end of capacitor C3, one end of capacitor C2, one end of capacitor C1, the cathode of diode D1, one end of fuse FS1, one end of resistor R7, one end of resistor R12, the cathode of diode ZD3, one end of capacitor C4, one end of resistor R2, one end of capacitor C5, one end of resistor R4, one end of resistor R15, the cathode of diode ZD1, and one end of resistor R1. The other end of fuse FS1 is connected to the input terminal C. The third and fourth terminals of N2 are connected. The first and second terminals of input CN2 are connected to the first and second terminals of input CN3. The third and fourth terminals of input CN3 are connected to one end of resistor R6 and the first terminal of MOSFET Q3. The other end of resistor R6 is connected sequentially to the third terminal of MOSFET Q3, the other end of resistor R7, and one end of resistor R9. The other end of resistor R9 is connected to the second terminal of MOSFET Q3. The anode of diode ZD3 is connected sequentially to one end of resistor R14 and one end of resistor R13. The other end of resistor R13 is connected to the third terminal of transistor Q4. The first terminal of transistor Q4 is connected sequentially to the other end of resistor R12, one end of capacitor C14, and the third terminal of transistor Q5. The first terminal of transistor Q5 is connected in sequence to the second terminal of chip IC1, the other terminal of resistor R1, and the first terminal of transistor Q1. The third terminal of transistor Q1 is connected in sequence to one terminal of capacitor C6 and one terminal of resistor R3. The other terminal of resistor R3 is connected in sequence to the positive terminal of diode ZD1 and one terminal of resistor R5. The other terminal of capacitor C4 is connected to the seventh terminal of chip IC1. The other terminal of resistor R2 is connected in sequence to the other terminal of capacitor C5 and the first terminal of chip IC1. The other terminal of resistor R15 is connected in sequence to the other terminal of resistor R4, the fifth terminal of chip IC1, and the first terminal of MOSFET Q2. The third terminal of MOSFET Q2 is connected to one terminal of resistor R16. The other terminal of resistor R16 is connected to the sixth terminal of chip IC1.The second terminal of MOSFET Q2 is connected in sequence to the cathodes of diodes D2, D3, and D4, one end of inductor L1, and one end of resistor R8. The other end of inductor L1 is connected in sequence to one end of capacitor C7, one end of capacitor C8, one end of resistor R10, one end of capacitor C10, one end of capacitor C11, one end of capacitor C15, one end of capacitor C13, the cathode of diode ZD2, and output terminals CN4 and CN5. The other end of resistor R8 is connected in sequence to the other end of capacitor C7 and one end of capacitor C9. The other end of capacitor C9 is connected in sequence to the third terminal of chip IC1, the other end of capacitor C8, the other end of resistor R10, and one end of resistor R11.

[0023] In one embodiment, the first and second terminals of output terminal CN4 are connected to the first and second terminals of output terminal CN5, and are also connected to the negative terminal of diode ZD2.

[0024] In one embodiment, the third terminal of output terminal CN4 is connected to the third terminal of output terminal CN5, and the fourth terminal of output terminal CN4 is connected to the fourth terminal of output terminal CN5.

[0025] In one embodiment, the first terminal of MOSFET Q3 is the drain, the second terminal of MOSFET Q3 is the source, and the third terminal of MOSFET Q3 is the gate.

[0026] In one embodiment, the first terminal of MOSFET Q2 is the source, the second terminal of MOSFET Q2 is the drain, and the third terminal of MOSFET Q2 is the gate.

[0027] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0028] In practical applications, within a voltage range of 9V-36V, the IC1 chip stabilizes the output voltage to 12V, with a maximum current load of 3A, to power the television. At the front end, there is a protection transistor Q3 (i.e., MOSFET Q3) to prevent reverse polarity of the power input; and a protection diode for input voltages exceeding 45V. Specifically, the combination of diode ZD3 and transistor Q4 controls the RT pin of the IC1 control pin to cut off the output when the voltage is below 9V; similarly, the combination of diode ZD1 and transistor Q1 cuts off the output when the voltage is above 36V, protecting the IC1 chip. The output port has a 15V protection diode to prevent damage to the IC1 chip and avoid damage to the motherboard due to excessively high output voltage.

[0029] In the power conversion circuit of this utility model that is compatible with 9-36V DC power input to a television, the function of input terminal CN2 includes:

[0030] (1) Connect to an external switch to control the power input; (2) Short circuit directly, without connecting a switch, directly conduct.

[0031] In addition, such as Figure 4 As shown, the power conversion circuit of the present invention also includes connector J1, connector J2, and connector CP1. (As indicated...) Figure 6 The diagram shown is a connection block diagram according to an embodiment of the present utility model. The connection process includes: inputting 9-36V DC to the TV decoding motherboard, and finally to the LCD screen and backlight.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power conversion circuit compatible with 9-36V DC power input for televisions, characterized in that, Includes chip IC1, input terminals CN2 and CN3, output terminals CN4 and CN5, MOSFET Q3, resistors R6, R7, and R9, fuse FS1, diode D1, capacitors C1, C2, and C3, diode ZD3, resistor R13, transistors Q4 and Q5, resistors R12, capacitors C14 and C4, resistors R2 and C5, resistors R4, R15, and R16, MOSFET Q2, diode ZD1, resistors R3, R5, and R1, capacitor C6, transistor Q1, diodes D2, D3, and D4, inductor L1, resistor R8, capacitors C7, C8, and C9, resistors R10 and R11, capacitors C10, C11, C15, C13, and diode ZD2; Specifically, the eighth terminal of chip IC1 is sequentially connected to one end of capacitor C3, one end of capacitor C2, one end of capacitor C1, the cathode of diode D1, one end of fuse FS1, one end of resistor R7, one end of resistor R12, the cathode of diode ZD3, one end of capacitor C4, one end of resistor R2, one end of capacitor C5, one end of resistor R4, one end of resistor R15, the cathode of diode ZD1, and one end of resistor R1. The other end of fuse FS1 is connected to the third and fourth terminals of input terminal CN2. The first and second terminals of input terminal CN2 are connected to the first segment of input terminal CN3. The input terminal CN3 is connected to the second terminal. The third and fourth terminals of CN3 are connected to one end of resistor R6 and the first terminal of MOSFET Q3. The other end of resistor R6 is connected to the third terminal of MOSFET Q3, the other end of resistor R7, and one end of resistor R9 in sequence. The other end of resistor R9 is connected to the second terminal of MOSFET Q3. The anode of diode ZD3 is connected to one end of resistor R14 and one end of resistor R13 in sequence. The other end of resistor R13 is connected to the third terminal of transistor Q4. The first terminal of transistor Q4 is connected to the other end of resistor R12, one end of capacitor C14, and the third terminal of transistor Q5 in sequence. The first terminal of transistor Q5 is connected in sequence to the second terminal of chip IC1, the other terminal of resistor R1, and the first terminal of transistor Q1. The third terminal of transistor Q1 is connected in sequence to one terminal of capacitor C6 and one terminal of resistor R3. The other terminal of resistor R3 is connected in sequence to the positive terminal of diode ZD1 and one terminal of resistor R5. The other terminal of capacitor C4 is connected to the seventh terminal of chip IC1. The other terminal of resistor R2 is connected in sequence to the other terminal of capacitor C5 and the first terminal of chip IC1. The other terminal of resistor R15 is connected in sequence to the other terminal of resistor R4, the fifth terminal of chip IC1, and the first terminal of MOSFET Q2. The third terminal of MOSFET Q2 is connected to one terminal of resistor R16. The other terminal of resistor R16 is connected to the sixth terminal of chip IC1. The second terminal of the MOSFET Q2 is sequentially connected to the cathode of diode D2, the cathode of diode D3, the cathode of diode D4, one end of inductor L1, and one end of resistor R8. The other end of inductor L1 is sequentially connected to one end of capacitor C7, one end of capacitor C8, one end of resistor R10, one end of capacitor C10, one end of capacitor C11, one end of capacitor C15, one end of capacitor C13, the cathode of diode ZD2, the output terminal CN4, and the output terminal CN5. The other end of resistor R8 is sequentially connected to the other end of capacitor C7 and one end of capacitor C9. The other end of capacitor C9 is sequentially connected to the third terminal of chip IC1, the other end of capacitor C8, the other end of resistor R10, and one end of resistor R11.

2. The power conversion circuit for a television compatible with 9-36V DC power input according to claim 1, characterized in that, The first and second terminals of the output terminal CN4 are connected to the first and second terminals of the output terminal CN5, and are also connected to the negative terminal of the diode ZD2.

3. The power conversion circuit for a television compatible with 9-36V DC power input according to claim 1, characterized in that, The third terminal of output terminal CN4 is connected to the third terminal of output terminal CN5, and the fourth terminal of output terminal CN4 is connected to the fourth terminal of output terminal CN5.

4. The power conversion circuit for a television compatible with 9-36V DC power input according to claim 1, characterized in that, The first terminal of the MOS transistor Q3 is the drain, the second terminal of the MOS transistor Q3 is the source, and the third terminal of the MOS transistor Q3 is the gate.

5. A power conversion circuit compatible with 9-36V DC power input for televisions according to claim 1, characterized in that, The first terminal of the MOS transistor Q2 is the source, the second terminal of the MOS transistor Q2 is the drain, and the third terminal of the MOS transistor Q2 is the gate.

Images