TWI271607B - Power-supply circuit for adjusting output voltage - Google Patents

Abstract

A power-supply circuit for adjusting output voltage is disclosed. The power-supply circuit includes a regulating circuit and a voltage sampling control circuit. The regulating circuit has a regulating terminal, an input terminal and an output terminal. The input terminal is provided to receive a voltage from a source supply. The output terminal is connected to a load for providing output voltage. The voltage sampling control circuit includes a first resistor and a second resistor connected in series between the output terminal and ground. The output voltage is through the voltage sampling control circuit and in feedback relationship with the regulating terminal, thus resulting in a regulating voltage generated at the output terminal. The voltage sampling control circuit also includes a third resistor, a forth resistor, a first switch and a second switch. A common terminal of the third resistor and forth resistor is connected to a node between the first resistor and the second resistor; the other terminals of the third resistor and the forth resistor are respectively connected to first terminals of the first switch and the second switch, second terminals of the first switch and the second switch are respectively connected to ground, third terminals of the first switch and the second switch are for respectively receiving controlling signals which control the third resistor and the forth resistor connected to ground for participating in voltage sampling control or not.

Description

1271607 IX. INSTRUCTIONS: [Technical Field] The present invention relates to a wheel-out adjustable power supply circuit on a computer motherboard. [Prior Art] In the motherboard design, the design of the power supply circuit is critical, and it will go straight to the quality of the entire motherboard. In order to accommodate more demand, it is necessary to optimize the power supply circuit or develop a new power supply circuit. Xiong Wei Wang Yin Cang Kao Di - Figure 'for a known kind of a regulated power supply circuit, including a ii ii10, it has an adjustment terminal 11, the input terminal 12 friend output terminal 13, the input terminal ί ft voltage Vm'; the output! Is the domain connected to a load γ 'the load heart' of the two ends of the f? Ground; there is electricity connected in parallel with the load R1· between the output terminal 13 and the ground; t ^ ' the node voltage is used as the reference voltage of the load & Wherein 'the voltage can be adjusted by adjusting the resistance of the electric energy, R2, or any of the two resistors 112, to provide a suitable reference voltage Vref, to the load R, the resistance R1', R2' partial pressure provides Give the negative D, the voltage v〇 the relationship of the Vref丨 as shown in the formula: ~, deficit

Vout'=Vref,*(1+ Ri,/ 幻幻) When the input terminal 12 receives the input voltage vin, which is 3.3v, the voltage regulation is stabilized at some output to the output terminal 13' to make the output terminal 13 1 input electric wrist range adjustment, the above, 咐 job search voltage [invention] ϋ ϋ ϋ ϋ 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 杂 可 可 可 可 可 可The voltage divider circuit includes an adjustment circuit and a sampling gate positive and negative circuit having an adjustment end, an input end and a wheel output end. The input 1271607 end receives an input voltage, and the load of the load is the wheel output power. Output ^^ "load, and the output is provided to a second resistor, the voltage divider circuit includes - a first-resistance and a gap, and the output of the round-out terminal is connected in series with the output terminal and the ground After the voltage divider circuit is divided, the voltage is fed back to the μ-switch transistor and the -n$$日-,:: phase resistor, a first end is connected to the first -^ ^^ 日日体's phase three resistance, the resistance of the fourth resistor, and the series connection between the other resistors of the fourth resistor, the third and second ends are respectively grounded, 苴第_媸你^关^4Ba limb, brother two The third resistor and the fine transistor of the switch transistor are used to control the output voltage of the foot circuit to be different. [Embodiment] Power supply ^ Invention The output of the preferred embodiment is adjustable, 91, 2, and An adjustment circuit 20 having an adjustment terminal 22 and an output 23, the input terminal 22 receiving - input voltage Vin Connecting the load R1' and the output terminal 23 is supplied to the output & output voltage Vout'. The output adjustable power supply circuit further includes a sampling circuit 30, and the sampling voltage dividing circuit 3 is the output The voltage v〇ut provides a reference =^Vref 'the output voltage of the output terminal 乂〇 is transmitted back to the adjustment terminal 21 through the sampling voltage dividing circuit #. #苍照第二图,本发8 In the middle of the month, the adjustment circuit 2 is composed of a field effect transistor and a double-f-type junction transistor. In the embodiment, the field effect transistor is a ^3 channel, a type MOS (Metal-Oxide Semiconductor)屯 crystal Q1, the bipolar junction transistor is an NPN type transistor q2. The drain of the Helium 3 transistor Q1 serves as an input terminal 22, which is connected to an input voltage vin, the input voltage Vin is 3.3V, the MOS The source of the transistor Q1 serves as the output terminal 23, and the other end of the load is connected to the other end of the pfRL of the 1271607 MOS transistor. The connection, the gate and the bipolar junction are electrically connected. The collector phase of the crystal Q2 - "the pressure of the emperor is V ', the node is connected to the pressure through a current limiting resistor, the adjustment The whole circuit 2G positive correction 2 collector working electric power circuit provides stability; S (2) can make the output adjustable - including 矸 丨 德 #德二, output voltage 乂 0 plus, make the input voltage Vin 调 adjust the transistor Q2 The emitter is grounded, and the base as the -voltage circuit 30 includes a first electric thin, a second resistor 汜, a fourth resistor R4, a first switching transistor Q3, and a -, ground-to-ground The third electric _, the fourth electric resistance is connected to the series node of the second electric _, and the other end of the third electric ϋ ί 2_ is respectively connected with the first switching transistor Q3 The first end of the first switch is connected to the first switch transistor Q3 and the second switch; the third end is used as a group control device. The second switching transistor—Q4 is a Ν channel depletion M〇s transistor, and the first switch=iiQ3, the first end of the second switching transistor ^the second end and the third end respectively correspond to the MOS transistor; : and extreme, secret and gate. a series node between the first resistor and the second resistor R2 is connected to a base of the bipolar junction transistor Q2. The series node voltage is used as a reference voltage Vref of the output adjustable power supply. The circuit 30 provides the reference voltage Vref for the output voltage v〇ut, and the adjustment circuit 20 stabilizes the output voltage of the output terminal 23 according to the reference voltage Vref provided by the sampling voltage dividing circuit 3〇. Say. The two control apostrophes input terminals 31 and 32 of the present invention pass through the four groups of "11,," "1", "plus," issued by the brain 03R control chip (not shown) on the receiving computer motherboard. "(10)", can generate four sets of fixed voltage l27l6〇7 "1" stands for high level signal, "〇,, 匕2, transistor Q4. Knife V" low level, :]: 曰? Resisting, the (four) just t electric system, the resistance and the second resistance ^ string, ^; = _ is the parallel circuit off the voltage V 〇 ut is: _ output adjustable power supply R2 Λΐ | | Λ3||Λ4

Vout = Vref*(i + 曰 曰 ^ 晶片 晶片 晶片 发出 发出 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片 晶片With the second electric power, the sampling is divided into piezoelectric partial pressure, and the output voltage v〇m of the first-resistor R1 and the Θ output adjustable regulated power supply circuit is:

Vout = Vref*(i + — and 2, quarter) When the IP8203R control chip sends a control signal “〇1, the switching transistor Q3 is turned off” and its drain and source are in a high-impedance state, the third Λ=R3 The second open circuit transistor Q4 is turned on, and the second switch transistor Q4 is turned on, and the second resistor R1, the second resistor R2, and the fourth power participate in the sampling point. The pressure circuit 3 is divided into dust, 10 1271607 ρ resistance R,

Vout = Vref*(l + —

Rl\\R4} When the IP8203R control chip sends a control signal "〇〇", the off transistor Q3 and the second switch transistor (9) are respectively turned off, the first - ^ body (^3, the second switch transistor q4 are In the high-resistance state, the ^4 and the fourth resistor R4 are open-circuited at both ends, and the first=R2 participates in the voltage division of the sampling voltage dividing circuit 3, and the first resistance touches ϋΙΪ2:4 (four) riding-touch Touchable power supply Wei's output power V〇ut = Vref*(i + ^ points / electricity ^ group Pu gift, the sampling Hong Road 曰 k release ° mourning brother two resistors R3, brother four resistors R4 participate in the partial pressure, to the number When the state is determined, the resistance of the third resistor R3 and the «four-resistance-like i is also determined. The output of the touch-control power supply circuit of the present invention is J·L-loaded 1^ instantaneously becomes large, so that the wheel is stable and stable. The output voltage of the voltage source is between Γ〇2 and 敎'. After the voltage divider of the voltage divider is divided, the reference voltage Vref is also greatly enhanced. The magnetic polarity junction transistor Q2 conductance is enhanced, the leg 29 and the bipolar The node voltage ν between the junction transistors Q2 is reduced to cause the voltage of the gate (the gate and the source of 51) to decrease, and the Hall 5 transistor H-pass capability is reduced. As its surface rises, it causes the QS transistor to drop 5', thus adjusting the previously larger output VGut to the electric divergence when =rl is stable. Conversely, when the load is instantaneously small, then The output power of the output adjustable dust power circuit is vout, and the reference electric (four) ef mixed double-connected crystal is sucked after being divided by the resistance of the participating power.

II 1271607 The node voltage v between the MOS transistor Q1 and the bipolar junction transistor q2 is increased, so that the conduction capability of the MOS transistor Q1 is enhanced, causing the tube voltage drop to fall, thereby causing the MOS transistor Q1. The voltage of the source rises, thereby stabilizing the output voltage Vout〇~. In the embodiment, the input voltage Vin is 3.3V, and when the driving voltage Vd is 12v, it is known that several calculation formulas of the circuit of the present invention are used. Each of the two control signal input terminals 31, 32 of the circuit of the present invention generates an output voltage Vout for each group of control signals. In the embodiment, the sampling voltage dividing circuit 30 receives four sets of control signals by selecting appropriate resistance parameters. When the four output voltages Vout are generated, as shown in the figure, if the voltage needs to be adjusted and the size of the cross is 1 , the appropriate resistance parameters can be selected.

J^__ _? sy to the signal input I receive the control signal ^ comparison table control signal input 31 control number input 32~~1 ^~ 0 suitable to send 0 complete circuit 2 0 can be a different number of fields The effect of the transistor is square; = for each = two can be field effect electric crystal difficult Wei Wei contact two: ^: ^ t way, also cover the equivalent modification or change in the two, should be culvert, simple Description] Ϊ—The system of the regulated power supply in the conventional technology. The second figure is the output of the preferred embodiment of the present invention, which can be used to touch the power supply circuit 12 1271607. [Main component symbol description] [Practical] Regulated power supply circuit 1 Adjusting wafer 10 Adjusting terminal 11 Input terminal 12 Output terminal 13 Voltage dividing resistor Rl, R2, Load Rl [Invention] Adjustment circuit 20 Adjustment terminal 21 Input terminal 22 Output ' 23 MOS transistor Ql bipolar junction transistor Q2 sampling divider circuit 30 first resistor R1 second resistor R2 third resistor R3 fourth resistor R4 current limiting resistor R load Rl first switching transistor Q3 control signal Input terminal 3 32 second switching transistor Q4

13

Claims (1)

1271607 t, the scope of application for patents: ι· two kinds of output stabilized _ source circuit, which includes - adjustment circuit and i receive two 2 Γΐ ί 3 adjustment end, input end and wheel end 'the wheel and 1 pair # t忒The wheel end is connected to a load, and the output terminal is ^ 、, ί, A is output о, the sampling voltage dividing circuit includes - - t 该 该 该 该 该 该 该 该I: The output voltage of the B ^ output is transmitted through the sample by the piezoelectric π ”. The adjustment end, the text is: the sampling circuit (10) is back, the series node is connected, the second and second electricity =:=, body, second The first end of the switching transistor is connected to the fourth end of the second circuit, and the second end of the second switching transistor is grounded respectively, and the f control signal input terminal controls the third resistor and the fourth resistor i Hi patent supplement The output can be touched by the power supply circuit, in the basin > the effect transistor and the - bipolar junction transistor, the: the output is connected to one end of the load, the negative two! Connected to the collector of the bipolar junction transistor, connected to a driving voltage by a current limiting resistor, the driving The voltage is supplied, the operating voltage of the -3⁄4 crystal gate and the bipolar junction are electrically charged;:!; 'The double-fir; the emitter of the surface transistor is grounded, and the base i is connected to the second day I: resistance With the series connection between the first and the first, the base of the bipolar junction is used as the adjustment end of the adjustment circuit. The application of the wheel according to the second item is applied to adjust the power supply circuit, % effect transistor It is an N-channel depleted MOS transistor. ', ^ 4 = Please select the output adjustable stable (four) source circuit as described in item 3 of the patent, and the bipolar junction transistor is a ΝΡΝ-type transistor. Τ ° °χ 14 • 1271607 5. The output adjustable regulated power supply circuit of claim 1, wherein the first switching transistor and the second switching transistor are respectively N-channel depletion MOS ^ ^ transistors, and the a switching transistor, a first end of the second switching transistor, a second terminal and a third terminal respectively corresponding to a drain, a source and a gate of the MOS transistor. 6. According to the first aspect of the patent application The output adjustable power supply circuit, wherein the control signal is sent by a control chip on a motherboard. The output adjustable power supply circuit of claim 1 is characterized in that the output adjustable power supply circuit can generate four fixed voltage output voltages according to the received control signal. 15