CN109672334B - Power supply capable of adjusting output voltage and operating system - Google Patents

Power supply capable of adjusting output voltage and operating system Download PDF

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Publication number
CN109672334B
CN109672334B CN201710966350.7A CN201710966350A CN109672334B CN 109672334 B CN109672334 B CN 109672334B CN 201710966350 A CN201710966350 A CN 201710966350A CN 109672334 B CN109672334 B CN 109672334B
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China
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voltage
pin
detection signal
power path
transmitting
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CN109672334A (en
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张燕雲
孙培华
简源利
陈凱勋
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Giga Byte Technology Co Ltd
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Giga Byte Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

Abstract

A power supply capable of adjusting output voltage is used for supplying power to a port of a mainboard and comprises a voltage generator, a first power path, a second power path, a detection circuit and a switch circuit. The voltage generator is used for generating a first voltage, a second voltage, a third voltage and a fourth voltage. The first power path is used for transmitting a first voltage to a first pin of the port. The second power path is used for transmitting a second voltage to a second pin of the port. The detection circuit detects the voltage of a third pin of the port to generate a detection signal. The switch circuit provides a third power path or a fourth power path according to the detection signal. The third power path is used for transmitting a third voltage to the third pin. The fourth power path is used for transmitting a fourth voltage to the third pin.

Description

Power supply capable of adjusting output voltage and operating system
Technical Field
The present invention relates to a power supply, and more particularly, to a power supply with adjustable output voltage.
Background
The conventional power supply converts an ac voltage into a dc voltage, and provides the dc voltage to an external device, such as a motherboard. However, the number of output voltages of the power supply is fixed, and cannot satisfy all the motherboards. For example, assume that a power supply constantly outputs 4 sets of 3.3V, 5 sets of 5V, and 2 sets of 12V. If a motherboard needs 7 sets of 3.3V, the power supply cannot meet the requirements of the motherboard.
Disclosure of Invention
The invention provides a power supply capable of adjusting output voltage, which is used for supplying power to a port of a mainboard and comprises a voltage generator, a first power supply path, a second power supply path, a first detection circuit and a first switch circuit. The voltage generator is used for generating a first voltage, a second voltage, a third voltage and a fourth voltage. The first power path is used for transmitting a first voltage to a first pin of the port. The second power path is used for transmitting a second voltage to a second pin of the port. The first detection circuit detects the voltage of a third pin of the port to generate a first detection signal. The first switch circuit provides a third power path or a fourth power path according to the first detection signal. The third power path is used for transmitting a third voltage to the third pin. The fourth power path is used for transmitting a fourth voltage to the third pin.
The first voltage is different from the second voltage, the third voltage is the same as the first voltage, and the fourth voltage is the same as the second voltage.
Wherein, the power supply capable of adjusting the output voltage further comprises:
the second detection circuit detects the voltage of a fourth pin of the port and is used for generating a second detection signal;
a second switch circuit, providing a fifth power path or a sixth power path according to the second detection signal, wherein the fifth power path is used for transmitting a fifth voltage to the fourth pin, and the sixth power path is used for transmitting a sixth voltage to the fourth pin.
Wherein the fifth voltage is the same as or different from the sixth voltage.
The power supply capable of adjusting the output voltage further comprises:
a signal generator for generating a second detection signal according to the first detection signal, wherein the first switch circuit provides the third power path for transmitting the third voltage to the third pin according to the first detection signal, and provides the fourth power path for transmitting the fourth voltage to the third pin according to the second detection signal.
Wherein the third voltage is different from the fourth voltage.
Wherein the first detection signal is opposite in phase to the second detection signal.
Wherein, this signal generator includes:
a pull-up element, receiving an operating voltage and coupled to an output node;
a transistor coupled to the output node and receiving the first detection signal; and
an energy storage element coupled to the output node.
Wherein, this first detection circuitry includes:
a first voltage divider for generating a first divided voltage according to the voltage of the third pin;
a second voltage divider for generating a second divided voltage according to a fifth voltage;
a comparator for comparing the first and second divided voltages to generate the first detection signal, wherein the fifth voltage is generated by the voltage generator and is equal to the first voltage or the second voltage.
When the first divided voltage is greater than the second divided voltage, the level of the first detection signal is equal to a specific voltage, and the specific voltage is greater than the first voltage and the second voltage.
The invention further provides an operating system, which comprises a main board and a power supply capable of adjusting output voltage. The motherboard includes a port. The port has a first pin, a second pin and a third pin. The power supply capable of adjusting the output voltage is used for supplying power to the mainboard and comprises a voltage generator, a first power path, a second power path, a first detection circuit and a first switch circuit. The voltage generator is used for generating a first voltage, a second voltage, a third voltage and a fourth voltage. The first power path is used for transmitting a first voltage to the first pin. The second power path is used for transmitting a second voltage to the second pin. The first detection circuit detects the voltage of the third pin to generate a first detection signal. The first switch circuit provides a third power path or a fourth power path according to the first detection signal. The third power path is used for transmitting a third voltage to the third pin. The fourth power path is used for transmitting a fourth voltage to the third pin.
Wherein, the third pin is electrically connected with the first pin or the second pin.
Drawings
FIG. 1 is a schematic diagram of an operating system of the present invention.
FIG. 2 is another schematic diagram of the operating system of the present invention.
Fig. 3A is a schematic diagram of a detection circuit of fig. 1.
FIG. 3B is a schematic diagram of another exemplary embodiment of a detection circuit.
Fig. 4A is a schematic diagram of a switch circuit of fig. 1.
Fig. 4B is another possible embodiment of the switch circuit of the present invention.
Wherein, the reference numbers:
100. 200: an operating system;
110. 210: a power supply;
120. 220, and (2) a step of: a main board;
121. 221: a port;
OP 1-OP 5: an operating voltage;
111. 211: a voltage generator;
112. 212, 214, 112A, 112B: a switching circuit;
113. 213, 215, 113A, 113B: a detection circuit;
114 to 117, 216 to 222: a power supply path;
V1-V7, VP13, PS 1-PS 3: a voltage;
P11-P13, P21-P25: a pin;
SD 1-SD 4: detecting a signal;
SW1, SW2, 411 to 414, 421 to 424: a switch;
118. 340, and (3): signal generator
310. 320, and (3) respectively: a voltage divider;
330: a comparator;
VD1, VD 2: partial pressure;
R1-R5: a resistance;
GND: a ground voltage;
341: a pull-up element;
T1-T9: a transistor;
ND: an output node;
c1, C2 energy storage element.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. The present description provides various examples to illustrate the technical features of various embodiments of the present invention. The configuration of the elements in the embodiments is for illustration and not for limitation. In addition, the reference numerals in the embodiments are repeated to simplify the description, and do not indicate any relationship between the different embodiments.
FIG. 1 is a schematic diagram of an operating system of the present invention. As shown, the operating system 100 includes a power supply 110 and a motherboard 120. The motherboard 120 receives and operates according to the voltage generated by the power supply 110. In one embodiment, the motherboard 120 has a port 121. The port 121 is coupled to the power supply 110 for receiving the voltage generated by the power supply 110, and providing the received voltage as the operating voltages OP1 and OP2 to other components (not shown) of the motherboard 120. The internal components of the motherboard 120 operate according to the operating voltages OP1 and OP 2. In the embodiment, fig. 1 only lists the elements related to the present invention, and is not intended to limit the present invention. The motherboard 120 still has other hardware components, which are not described herein in detail.
The power supply 110 supplies power to the port 121 of the motherboard 120 and can adjust the amount of output voltage. As shown, the power supply 110 includes a voltage generator 111, a switch circuit 112, a detection circuit 113, and power paths 114-117. In the present embodiment, the voltage generator 111 is used for generating the voltages V1-V4. The present invention does not limit the number of voltages generated by the voltage generator 111. In other embodiments, the voltage generator 111 may generate fewer or more voltages. In the present embodiment, the voltage V1 is different from the voltage V2, and in a possible embodiment, the voltage V1 is 3.3V and the voltage V2 is 5V. In another possible embodiment, voltages V3 and V4 are not equal to voltages V1 and V2. In other embodiments, voltage V3 is equal to voltage V1 and voltage V4 is equal to voltage V2.
The power path 114 is used for transmitting the voltage V1 to a pin P11 of the port 121. The pin P11 receives the voltage V1 and provides the voltage V1 as the operating voltage OP1 to other components of the motherboard 120. The power path 115 is used for transmitting the voltage V2 to a pin P12 of the port 121. The pin P12 receives the voltage V2 and provides the voltage V2 as the operating voltage OP2 to other components of the motherboard 120. In the embodiment, when the power supply 110 is coupled to the motherboard 120, the power supply 110 continuously provides the voltages V1 and V2 to the motherboard 120.
The detection circuit 113 detects a voltage at a pin P13 of the port 121 to generate a detection signal SD1. The designer of the motherboard 120 may electrically connect the pin P13 to the pin P11 or P12 according to the power requirement of the motherboard. For example, assume that the voltage V1 received at the pin P11 is 3.3V and the voltage V2 received at the pin P12 is 5V. In this example, if the motherboard 120 requires more 3.3V, the designer may electrically connect the pin P13 to the pin P11. Conversely, if the motherboard 120 requires more 5V, the designer may electrically connect the pin P13 to the pin P12. The detection circuit 113 can obtain the voltage required by the motherboard 120 according to the voltage at the pin P13, so the detection signal S can be utilizedD1The control switch circuit 112 outputs the appropriate voltage to the pin P13. In other embodiments, if the motherboard 120 requires more than 3.3V, the designer may electrically connect the pin P13 to the pin P12. Similarly, if the motherboard 120 requires more 5V, the designer may electrically connect the pin P13 to the pin P11.
The switch circuit 112 is based on the detection signal SD1A power path 116 or 117 is provided. In one embodiment, the switch circuit 112 includes switches SW1 and SW 2. When detecting the signal SD1When the switch SW1 is turned on, the power path 116 between the voltage generator 111 and the pin P13 is turned on, and the voltage V3 is transmitted to the pin P13 through the power path 116. When detecting the signal SD1When the switch SW2 is turned on, the power path 117 between the voltage generator 111 and the pin P13 is turned on, and the voltage V4 is transmitted to the pin P13 through the power path 117. In the present embodiment, the switches SW1 and SW2 are not turned on simultaneously. In other embodiments, the switch circuit 112 has more switches, each for transmitting an appropriate voltage to the motherboard 120.
In the above embodiment, switches SW1 and SW2 are driven by the same signal (e.g., S)D1) Controlled but not limiting the invention. In other embodiments, switches SW1 and SW2 may be controlled by two signals. In this embodiment, the power supply 110 further includes a signal generator 118. The signal generator 118 is based on the detection signal SD1Generating a detection signal SD2. Detecting signal SD1To turn on or off switch SW 1. Detecting signal SD2To turn on or off switch SW 2.
Detecting signal SD1Opposite to the detection signal SD2. For example, when detecting the signal SD1When the level is high, the signal S is detectedD2Is low. However, when the signal S is detectedD1When the level is low, the signal S is detectedD2Is high. Thus, when switch SW1 is conductive, switch SW2 is non-conductive. Likewise, when switch SW1 is non-conductive, switch SW2 is conductive.
FIG. 2 is a diagram of another exemplary embodiment of an operating system. Fig. 2 is similar to fig. 1, except that the power supply 210 of fig. 2 provides more voltage to the main board 220. In the embodiment, the port 221 of the motherboard 220 has pins P21-P25, but the invention is not limited thereto. In other embodiments, port 221 has fewer or more pins. As shown, pin P22 is electrically connected to pin P25. The pin P23 is electrically connected to the pin P24.
The power supply 210 includes a voltage generator 211, switch circuits 212, 214, detection circuits 213, 215, and power paths 216-222. The voltage generator 211 generates voltages V1-V7. In one possible embodiment, the voltages V1-V3 are different. In another possible embodiment, both voltages V1-V3 are the same. In other embodiments, the voltage V4 may be the same as one of the voltages V1-V3. In this example, the voltage V5 may be the same as the other of the voltages V1-V3. In some embodiments, the voltage V6 may be the same as one of the voltages V1-V3. In this example, the voltage V7 may be the same as the other of the voltages V1-V3.
The power path 216 delivers the voltage V1 to the pin P21. The pin P21 uses the voltage V1 as the operating voltage OP3 for other devices of the motherboard 220. Power path 217 provides voltage V2 to pin P22. The pin P22 uses the voltage V2 as the operating voltage OP4 for other devices of the motherboard 220. Power path 218 delivers voltage V3 to pin P23. The pin P23 uses the voltage V3 as the operating voltage OP5 for other devices of the motherboard 220. In the present embodiment, the power paths 216-218 continuously transmit voltages V1-V3. Therefore, when the power supply 210 is coupled to the port 221, the pins P21-P23 can immediately receive the voltages V1-V3.
The detection circuit 213 generates a detection signal S according to the voltage at the pin P24D3. The switch circuit 212 is based on the detection signal SD3Turning on the power path 219 or 220. Power path 219 delivers voltage V4 to pin P24. The power path 220 is used to transmit the voltage V5 to the pin P24. Since the characteristics of the detection circuit 213 are the same as those of the switch circuit 112 in fig. 1, the description thereof is omitted.
The detecting circuit 215 detects the voltage at the pin P25 of the port 221 to generate a detecting signal SD4. The switch circuit 214 is based on the detection signal SD4The power supply path 221 or 222 is turned on. Power path 221 is used to transmit voltage V6 to pin P25. The power path 222 is used to transmit the voltage V7 to the pin P25. In one possible embodiment, the voltage V6 is the same as one of the voltages V4 and V5. In this case, the voltage V7 may be the same as the other of the voltages V4 and V5.
In other embodiments, the signal generator 118 of fig. 1 can also be applied in fig. 2. In this case, the power supply 210 may have a first signal generator (not shown) and a second signal generator. The first signal generator is based on the detection signal SD3A first inverted signal is generated. The switch circuit 212 is based on the detection signal SD3And the first inverted signal output voltage V4 or V5 to the pin P24. In addition, the second signal generator is based on the detection signal SD4Generating a second inverted signal. The switch circuit 214 is based on the detection signal SD4And the second inverted signal output voltage V6 or V7 to the pin P25.
Fig. 3A is a schematic diagram of a detection circuit of fig. 1. The detection circuit of FIG. 3A can also be applied to FIG. 2. The detection circuit 113A includes voltage dividers 310 and 320 and a comparator 330. The voltage divider 310 is based on the voltage V at the pin P13 of the port 121 on the motherboard 120P13Generating a partial pressure VD1. In the present embodiment, the voltage divider 310 includes resistors R1 andand R2. A resistor R1 connected in series with a resistor R2 at a voltage VP13And the ground voltage GND.
The voltage divider 320 generates a divided voltage V according to a voltage PS1D2. In one possible embodiment, the voltage PS1 is generated by the voltage generator 111 of fig. 1. The voltage PS1 may be the same as one of the voltages V1-V2 or different from the voltages V1 and V2. In the present embodiment, the voltage divider 320 includes resistors R3 and R4. The resistor R3 is connected in series with the resistor R4 between the voltage PS1 and the ground voltage GND.
The comparator 330 compares the divided voltage VD1And VD2For generating a detection signal SD1. In the present embodiment, the non-inverting input terminal of the comparator 330 receives the divided voltage VD1The inverting input terminal of the comparator 330 receives the divided voltage VD2. When the partial pressure V isD1Greater than partial pressure VD2While detecting the signal SD1Is approximately equal to the voltage PS 2. In one embodiment, the voltage PS2 is generated by the voltage generator 111. In this example, the voltage PS2 may be greater than the voltages V1 and V2, but is not intended to limit the present invention. In other embodiments, the voltage PS2 is approximately equal to the voltage V1 or V2. When the partial pressure V isD1Less than partial pressure VD2While detecting the signal SD1Is approximately equal to the ground voltage GND.
In another possible embodiment, the voltage divider 310 further includes a power storage element C1. The energy storage element C1 is connected in parallel with the resistor R2 for controlling the divided voltage VD1The delay time of (c). In this case, the energy storage element C1 can prevent the comparator 330 from generating an incorrect detection signal SD1. In one embodiment, the energy storage element C1 is a capacitor.
FIG. 3B is a schematic diagram of another exemplary embodiment of a detection circuit. Fig. 3B is similar to fig. 3A, except that fig. 3B includes a signal generator 340. In other embodiments, the signal generator 340 is independent from the detection circuit 113B. The signal generator 340 generates a detection signal S according to the detected signalD1Generating a detection signal SD2. Detecting signal SD1Opposite to the detection signal SD2。
The signal generator 340 includes a pull-up element 341 and a transistor T1. The pull-up device 341 receives a voltage PS3 and is coupled to an output node ND for pulling up the voltage at the output node ND to a voltage PS 3. In the present embodiment, the pull-up element 341 is a resistor R5.
The transistor T1 is coupled to the output node ND and receives the detection signal SD1. The transistor T1 is used as a pull-down device for pulling down the voltage at the output node ND to the ground voltage GND. For example, when detecting the signal SD1When high, the transistor T1 is turned on. Therefore, the voltage of the output node ND is equal to the ground voltage GND, i.e., the detection signal SD2Is low. When detecting the signal SD1At low, the transistor T1 is not turned on. Therefore, the voltage at the output node ND is equal to the voltage PS3, i.e., the detection signal SD2Is high. In one possible embodiment, the voltage PS3 is equal to the voltage PS 2. For example, the voltages PS2 and PS3 are both + 12V. In other embodiments, voltage PS3 is not equal to voltage PS 2. In this case, the voltage PS3 may be the same as the voltages V1 or V2, or different from the voltages V1 and V2.
In another embodiment, the signal generator 340 further includes an energy storage element C2. The energy storage element C2 is coupled to the output node ND for avoiding the detection signal SD2Is the same as the detection signal SD1. In one embodiment, the energy storage element C2 is a capacitor. In this example, the capacitance of the capacitor is about 560 u.
Fig. 4A is a schematic diagram of a switch circuit of fig. 1. The switch circuit of fig. 4A can also be applied to fig. 2. The switch circuit 112A includes switches 411 to 414. As shown, power path 116 has switches 411 and 412. Switch 411 is coupled to switch 412 and receives voltage V3. The switch 412 is coupled between the switch 411 and the pin P13. Power path 117 has switches 413 and 414. Switch 413 is coupled to switch 414 and receives voltage V4. The switch 414 is coupled between the switch 413 and the pin P13.
When detecting the signal SD1At a first level (e.g., low level), the switches 411 and 412 are conductive, and the switches 413 and 414 are non-conductive. Thus, the power path 116 delivers the voltage V3 to the pin P13. When detecting the signal SD1At a second level (e.g., high level), the switches 411 and 412 are not conductive, and the switches 413 and 414 are conductive. Thus, it is possible to provideThe power path 117 delivers the voltage V4 to the pin P13.
The present invention does not limit the types of the switches 411 to 414. In the embodiment, the switches 411 and 412 are P-type transistors T2 and T3, respectively, and the switches 413 and 414 are N-type transistors T4 and T5, respectively, but the invention is not limited thereto. In other embodiments, the switches 411 and 412 are N-type transistors, and the switches 413 and 414 are P-type transistors.
In some embodiments, the power supply path 116 may have more or fewer switches. Likewise, the power path 117 may have more or fewer switches. The number of switches of power path 116 may be the same or different than the number of switches of power path 117. In addition, switches 412 and 414 may be omitted. In this example, power path 116 has only a single switch 411, and power path 117 also has only a single switch 413.
Fig. 4B is another possible embodiment of the switch circuit of fig. 1. FIG. 4B is similar to FIG. 4A, except that the switches 421-424 are all transistors of the same type, such as N-type transistors T6-T9, but not limiting the invention. In other embodiments, the switches 421-424 may be all P-type transistors. The switch circuit 112B also detects the signal SD1And SD2The voltage V3 or V4 is sent to the pin P13.
In the present embodiment, when the signal S is detectedD1Is at a first level (e.g., low level) and detects the signal SD2At a second level (e.g., high level), the switches 421 and 422 are turned on and the switches 423 and 424 are turned off. Thus, the power path 116 delivers the voltage V3 to the pin P13. However, when the signal S is detectedD1Is at a second level (e.g., high level) and detects the signal SD2At a first level (e.g., low), switches 421 and 422 are non-conductive and switches 423 and 424 are conductive. Thus, the power path 117 delivers the voltage V3 to the pin P13.
The power supply of the invention can provide additional voltage (such as at least one 3.3V, at least one 5V or one 3.3V and one 5V) to the mainboard according to the level of the pins on the mainboard besides providing basic voltage (such as one 3.3V and one 5V) to the mainboard, thereby meeting the power supply requirement of the mainboard. Therefore, the designer can command the external power supply to provide the required power by simply setting the level of a specific pin (e.g., the pin P13 in FIG. 1) according to the characteristics of the components on the motherboard.
Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be understood as commonly understood by one of ordinary skill in the art. Moreover, unless expressly stated otherwise, the definition of a term in a general dictionary shall be construed as being consistent with its meaning in the context of the relevant art and shall not be construed as an idealized or overly formal definition.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. A power supply capable of adjusting output voltage is used for supplying power to a port of a mainboard, and is characterized by comprising:
a voltage generator for generating a first voltage, a second voltage, a third voltage and a fourth voltage;
a first power path for transmitting the first voltage to a first pin of the port;
a second power path for transmitting the second voltage to a second pin of the port;
the first detection circuit detects the voltage of a third pin of the port and is used for generating a first detection signal; and
a first switch circuit, providing a third power path or a fourth power path according to the first detection signal, wherein the third power path is used for transmitting the third voltage to the third pin, and the fourth power path is used for transmitting the fourth voltage to the third pin;
a signal generator for generating a second detection signal according to the first detection signal, wherein the first switch circuit provides the third power path for transmitting the third voltage to the third pin according to the first detection signal, and provides the fourth power path for transmitting the fourth voltage to the third pin according to the second detection signal.
2. The power supply of claim 1, wherein the first voltage is different from the second voltage, the third voltage is the same as the first voltage, and the fourth voltage is the same as the second voltage.
3. The power supply of claim 1, further comprising:
the second detection circuit detects the voltage of a fourth pin of the port and is used for generating a second detection signal;
a second switch circuit, providing a fifth power path or a sixth power path according to the second detection signal, wherein the fifth power path is used for transmitting a fifth voltage to the fourth pin, and the sixth power path is used for transmitting a sixth voltage to the fourth pin.
4. The power supply of claim 3, wherein the fifth voltage is the same as or different from the sixth voltage.
5. The power supply of claim 1, wherein the third voltage is different from the fourth voltage.
6. The power supply of claim 1, wherein the first detection signal is inverted with respect to the second detection signal.
7. The power supply of claim 1, wherein the signal generator comprises:
a pull-up element, receiving an operating voltage and coupled to an output node;
a transistor coupled to the output node and receiving the first detection signal; and
an energy storage element coupled to the output node.
8. The power supply of claim 1, wherein the first detection circuit comprises:
a first voltage divider for generating a first divided voltage according to the voltage of the third pin;
a second voltage divider for generating a second divided voltage according to a fifth voltage;
a comparator for comparing the first and second divided voltages to generate the first detection signal, wherein the fifth voltage is generated by the voltage generator and is equal to the first voltage or the second voltage.
9. The power supply of claim 8, wherein the level of the first detection signal is equal to a specific voltage when the first divided voltage is greater than the second divided voltage, the specific voltage being greater than the first voltage and the second voltage.
10. An operating system, comprising:
a mainboard, which comprises a port, wherein the port is provided with a first pin, a second pin and a third pin; and
a power supply capable of adjusting output voltage, supplying power to the motherboard, and comprising:
a voltage generator for generating a first voltage, a second voltage, a third voltage and a fourth voltage;
a first power path for transmitting the first voltage to the first pin;
a second power path for transmitting the second voltage to the second pin;
a first detection circuit for detecting the voltage of the third pin to generate a first detection signal; and
a first switch circuit, providing a third power path or a fourth power path according to the first detection signal, wherein the third power path is used for transmitting the third voltage to the third pin, and the fourth power path is used for transmitting the fourth voltage to the third pin;
a signal generator for generating a second detection signal according to the first detection signal, wherein the first switch circuit provides the third power path for transmitting the third voltage to the third pin according to the first detection signal, and provides the fourth power path for transmitting the fourth voltage to the third pin according to the second detection signal.
11. The operating system of claim 10, wherein the third pin is electrically connected to the first pin or the second pin.
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CN101639669A (en) * 2008-07-30 2010-02-03 鸿富锦精密工业（深圳）有限公司 Power switching circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080032829A (en) * 2006-10-11 2008-04-16 엘지전자 주식회사 Apparatus and method for power supply
CN201146381Y (en) * 2008-01-22 2008-11-05 高效电子股份有限公司 Power supplier capable of hoisting efficiency
CN101639669A (en) * 2008-07-30 2010-02-03 鸿富锦精密工业（深圳）有限公司 Power switching circuit

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