TW201209536A - Adjusting circuit and motherboard including the same - Google Patents

Abstract

An adjusting circuit is configured to receive power from a motherboard for supplying power to a liquid crystal display (LCD). The adjusting circuit includes an adjusting module, a controlling chip, a plurality of switches, and a plurality of resistors. An input of the adjusting module receives a first power of the motherboard. An output of the adjusting module connects to the LCD. A plurality of sensing terminal of the controlling chip connects to the LCD to sense current of a backlight module of the LCD. A driving terminal of the sensing module connects to a controlling terminal of the adjusting module to output corresponding driving signals for controlling the adjusting module to output different voltage according to the current sensed. A terminal of each resistor connects to a sensing terminal of the controlling chip via a switch. Another terminal of each resistor grounds. The invention further provides a motherboard including the adjusting circuit.

Description

201209536 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a motherboard, and more particularly to a motherboard having a power conditioning circuit. [Previous sputum surgery] [0002] In the all-in-one machine, the operating voltage of the LCD monitor is obtained by converting the + 19V voltage on the main board from an adapter board. Since different liquid crystal monitors have different voltage ratings, it is necessary to design different adapter boards for each type of liquid crystal monitor, which makes it costly when mass producing an all-in-one machine with different monitors. SUMMARY OF THE INVENTION [0003] In view of the above, it is necessary to provide a power supply adjusting circuit that can be applied to the rated operating voltage of various liquid crystal monitors, and a motherboard having the power regulating circuit. [0004] A power conditioning circuit for receiving a voltage of a motherboard to provide an operating voltage for a liquid crystal monitor, the power conditioning circuit comprising: [0005] a power conditioning module, the input end of which is configured to receive the motherboard a voltage, the output end is connected to the liquid crystal monitor; [0006] a control chip, the plurality of sensing ends connected to the liquid crystal monitor for sensing current of the backlight module in the liquid crystal monitor, the driving end of the control chip and the power source The control terminal of the adjustment module is connected, and is configured to output a corresponding driving signal according to the current value sensed by the sensing terminal to control the power regulating module to output different working voltages to the monitor; [0007] a connecting device; and 099128176 Form No. A0101 4 pages/total 15 pages 0992049536-0 201209536 [0008] a plurality of first resistors, wherein one end of each first resistor is connected to a sensing end of the control chip through a connecting device, and the other ends of the first resistors are grounded, The connecting device is configured to control the first resistor to be connected or disconnected from the corresponding sensing end. [0009] A motherboard includes a power conditioning circuit, the power conditioning circuit includes: [0010] a power conditioning module, the input end is for receiving the first voltage of the motherboard, the output is connected to a liquid crystal monitor; [0011] a control chip, the plurality of sensing ends connected to the liquid crystal monitor for sensing the current of the backlight block in the liquid crystal monitoring Is * the driving end of the control chip is connected to the control end of the power regulating module for The current value sensed by the sensing end outputs a corresponding driving signal to control the power regulating module to output different operating voltages to the liquid crystal monitor; [0012] a connecting device; and [0013] a plurality of first resistors, wherein each first One end of the resistor is connected to an inductive end of the control chip through the connecting device, and the other end of the first resistor is grounded. The connecting device is configured to control the first resistor to be connected or disconnected from the corresponding sensing end. [0014] The power conditioning circuit and the motherboard control the connection or disconnection between the resistor and the sensing terminal through the connecting device, thereby changing the current sensed by the sensing terminal of the control chip, so that the power regulating module outputs different voltage values to Different LCD monitors. [Embodiment] Referring to FIG. 1, a first preferred embodiment of the power conditioning circuit of the present invention includes 099128176. Form No. A0101 Page 5 of 15 0992049536-0 201209536 includes a power conditioning module (VRM) 10. A control chip 12, a plurality of switches, and a plurality of first and second resistors. [0016] The input terminal Vin of the power conditioning module 10 is connected to a +19V power supply on a motherboard, and the output terminal Vout is connected to a liquid crystal display (LCD) 22. The power conditioning module 10 is operative to convert the received + 19 volts to a suitable voltage value to provide an operating voltage to the liquid crystal monitor 22. The control terminal C of the power conditioning module 10 is connected to the driving terminal DRV of the control chip 12, and the sensing terminal of the control chip 12 (the control chip 12 includes four sensing terminals ISEN ISEN4 in this embodiment) and the The liquid crystal monitor 22 is connected. The control chip 12 is configured to control the operating state of the power conditioning module 10 according to the current of the backlight module in the liquid crystal monitor 22 induced by the sensing terminals ISEN1-ISEN4, and output the corresponding driving signal through the driving terminal DRV to enable the power supply. The adjustment module 10 outputs a corresponding voltage value to the liquid crystal monitor 22. The input terminal of the control chip 12 is for receiving a pulse width modulation (PWM) signal, which can be used to adjust the brightness of the liquid crystal monitor 22 and the like. [0018] One end of each of the first resistors is connected to an inductive end of the control wafer 12 through a switch, and the other end is grounded; and each of the second resistors is connected in parallel with a first resistor. In this embodiment, four first resistors R1, R3, R5, and R7 and four second resistors R2, R4, R6, and R8 are included, wherein one end of the first resistor R1 passes through the switch S1 and the sensing terminal IS of the control wafer 12 - EN1 is connected and the other end is grounded; one end of the first resistor R3 is connected to the sensing terminal ISEN2 of the control chip 12 through the switch S2, and the other end is grounded; one end of the first resistor R5 passes through the switch S3 and the sensing terminal ISEN3 of the control wafer 12 Connected, the other end is grounded; one end of the first resistor R4 is connected to the sensing terminal ISEN4 of the control chip 12 through the switch S4 and the 099128176 form number A0101 page 6 / 15 page 0992049536-0 201209536, and the other end is grounded. The second resistors R2, R4, R6 and R8 are connected in parallel with the first resistors R1, R3, R5 and R7. [0019] In the present embodiment, the control wafer 12 is a control wafer of the 02 OZ9967 model. According to the specification sheet of the 02 0Z9967 wafer, the control wafer 12 and the power supply adjustment module 10 satisfy the following formula:

[0020] V where v is power regulation

OUT

The output voltage of the module 10, L is the sum of the output inductance of the control wafer 12 for the current of the backlight module in the liquid crystal monitor 22 sensed by the sensing terminals ISEN1-ISEN4 of the control wafer 12, and D is the received by the control wafer 12. The duty cycle of the PWM signal, T is the operating period of the control wafer 12.

[0021] It can be seen from the above formula that the output voltage V ❹ of the power conditioning module 10 and the current received by the control chip 12 are positive.

OUT ^ED

The ratio, that is, the output voltage of the power conditioning module 10 can be changed by changing the current received by the control chip 12.

iLED

OUT

[0022] Thus, the designer can adjust the closing or opening of the switch Sb S4 according to the specifications of different liquid crystal monitors, so that the control wafer 12 can be correspondingly changed. 099128176 Form No. A0101 Page 7 / Total 15 Page 0992049536- 0 201209536 Received current. For example, when it is known that the rated voltage of the first liquid crystal monitor to be used is V1 and the current output by the backlight module is π, the output voltage V of the power regulating module 1 is controlled according to the power supply.

OUT

The proportional relationship between the currents received by the wafer 12 can be seen as the current of the backlight module in the first liquid crystal monitor sensed by the sensing terminal IS-EIH-ISEN4 of the control wafer when the switches S4 are all turned off. The sum may be such that the output voltage V of the power conditioning module 10 is equal to the rated voltage value of the first liquid crystal monitor. When you need it

OUT The second LCD monitor to be used has a rated voltage of V2 (where V2 is less than VI) and its backlight module outputs 12 (12 is less than Π), according to the output voltage V of the power conditioning module 1〇 control

The proportional relationship between the currents received by the OUT chip 12 shows that the backlight module in the second liquid crystal monitor 22 sensed by the sensing terminals ISEN1-ISEN4 of the control chip when the switch S1 is closed and the switches S2-S4 are turned off. The sum of the currents is such that the output voltage V of the power conditioning module 1 等于 is equal to the rated voltage of the second liquid crystal monitor.

OUT In the above description, closing the switch si causes the resistors R1 and R3 to shunt the current sensed by the sensing terminal I SEN 1 of the control wafer 12, thereby making 099128176 Form No. A0101 Page 8 / Total 15 Page 0992049536-0 [0023] 201209536 The sum of the currents of the backlight modules in the second liquid crystal monitor sensed by the sensing terminals ISEN1-ISEN4 of the control wafer 12 is relatively small, so

^LBD

Further, when the voltage V output by the voltage adjustment module 10 is opposite to that of the first liquid crystal monitor, the voltage adjustment module 10 is used.

The voltage v output by the UUT is small.

OUT

2 is a second preferred embodiment of the power conditioning circuit of the present invention. In the second embodiment, the 'one connector 15' replaces the four switches S1-S4 in the first embodiment. The connector 15 includes four sets of pins, each set of pins includes a first pin and a second pin, wherein the four pins of the set of pins correspond to the sensing end ISE of the control chip 12 The _ISEN4 is connected to the 'second pin' through the first resistor (Rl, R3, R5 and R7) grounded. The sensing terminals ISEN1-ISEN4 of the control wafer 12 are also connected to the liquid crystal monitor 22. The first of each set of pins is connected to the second pin via a jump-cap. The upper resistors R2, R4, R6, and (10) are connected in parallel to the first-electrons mR1, R3, R5, and R7, respectively. Just like the first embodiment, the designer can connect or disconnect the corresponding first and second pins through the jump cap according to the specifications of the liquid crystal monitor, so that the control chip 12 can be correspondingly changed. The current & part ° such as 'when f is to use the m-th view, the first pin and the second pin of the four sets of pins are disconnected, so that the output voltage of the power regulating module 10 V 笪 寺The amount of the first LCD monitor is 099128176 Form No. 1010101 Page 9 / Total 15 Page 0992049536-0 201209536 Constant voltage value. When the second liquid crystal monitor is needed, the first pin of the first group of pins is connected to the second pin, and the first pin and the second pin of the other group of pins are disconnected, so that the power source is The output voltage V of the regulating module 1 〇 is equal to the rated voltage value of the second liquid crystal monitor. of course

OUT, in other embodiments, the switch and the connector may be other connecting devices as long as they can control the connection or disconnection between the resistor and the corresponding sensing terminal. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0027] FIG. 1 is a schematic diagram of a first preferred embodiment of a power conditioning circuit of the present invention [0028] FIG. 2 is a schematic diagram of a second preferred embodiment of a power conditioning circuit of the present invention 099128176 Form No. A0101 Page 10 of 15 0992049536-0 [Description of main component symbols] [0029] Power conditioning module: 10 [0030] Input: Vin [0031] Output: Vout [0032] Console: C [0033 Control chip: 12 201209536

[0034] Driver: DRV

[0035] Inductive terminals: ISEN1, ISEN2, ISEN3, ISEN4 [0036] Switch: SI, S2, S3, S4 [0037] Resistor: R1, R2, R3, R4, R5, R6, R7, R8 [0038] Connector :15 [0039] LCD monitor: 22

099128176 Form No. A0101 Page 11 of 15 0992049536-0

Claims (1)

201209536 VII. Patent application scope: 1. A power supply adjusting circuit for receiving a voltage of a motherboard to provide a working voltage for a liquid crystal monitor, the power regulating circuit comprising: a power regulating module, wherein an input end is used for receiving the host a first voltage of the board, the output end is connected to the liquid crystal monitor; a control chip, the plurality of sensing ends are connected to the liquid crystal monitor, and is used for sensing the current of the liquid crystal monitoring the inner backlight core block of the control unit The control end of the power conditioning module is connected to output a corresponding driving signal according to the current value sensed by the sensing terminal, and the power regulating module outputs different working voltages to the liquid crystal monitor; a connecting device; and a plurality of first resistors One end of each of the first resistors is connected to an inductive end of the control chip through the connecting device, and the other end of the first resistors is grounded, and the connecting device is configured to control the first resistor to be connected to the corresponding sensing end. Or disconnected. 2. The power conditioning circuit of claim 1, further comprising a plurality of second resistors, wherein each of the second resistors is connected in parallel with a first resistor 〇3. As claimed in claim 1 or 2 The power conditioning circuit of the item, wherein the connecting device comprises a plurality of switches. 4. The power conditioning circuit of claim 1 or 2, wherein the connecting device comprises a connector comprising a plurality of pairs of pins, wherein the first of each pair of pins is A sensing end of the control chip is connected, and the second pin is connected to a first resistor, and each pair of pins of the connector is connected or disconnected through a jump cap. 099128176 Form No. A0101 Page 12 of 15 0992049536-0 201209536 5 . A motherboard, comprising a power conditioning circuit, the power conditioning circuit comprising a power conditioning module, the input of which is used to receive the first of the motherboard a voltage, the output end is connected to a liquid crystal monitor; a control chip, wherein the plurality of sensing ends are connected to the liquid crystal monitor for sensing current of the backlight module in the liquid crystal monitor, the driving end of the control chip and the power regulating module The control end is connected to output a corresponding driving signal according to the current value sensed by the sensing end, and the power regulating module outputs different working voltages to the liquid crystal monitor; ^ a connecting device; and a plurality of first resistors, each of which One end of the first resistor is connected to an inductive end of the control chip through the connecting device, and the other end of the first resistor is grounded. The connecting device is configured to control the first resistor to be connected or disconnected from the corresponding sensing end. 6. The motherboard of claim 5, further comprising a plurality of second resistors, wherein each of the second resistors is coupled to a first resistor ii. 7. The motherboard of claim 5, wherein the connection device comprises a plurality of switches. 8. The motherboard of claim 5, wherein the connecting device comprises a connector, the connector comprising a plurality of pairs of pins, wherein the first pin of each pair of pins A sensing end of the control chip is connected, and the second pin is connected to a first resistor, and each pair of pins of the connector is connected or disconnected through a jump cap. 099128176 Form No. A0101 Page 13 of 15 0992049536-0