power supply

Abstract

To provide a power supply device that can satisfy the power supply requirements of a USB device connected to a computer device and can avoid the possibility that the power supply voltage of the USB connection terminal of the computer device is too low. [Solution] The power supply device includes a rectifier circuit, a power supply circuit, a feedback control circuit, and a switch. The rectifier circuit converts AC power into DC power. When the switch is in a first mode, the feedback control circuit provides a first feedback voltage to the power supply circuit. The power supply circuit regulates the DC power to a first voltage based on the first feedback voltage. When the switch is in a second mode, the feedback control circuit provides a second feedback voltage to the power supply circuit, and the power supply circuit regulates the DC power to a second voltage based on the second feedback voltage. The second voltage has a voltage value lower than the voltage value of the DC power supply and is higher than the voltage value of the first voltage by a predetermined boost value.

Description

[Technical Field]

[0001] The present invention relates to power supply technology for computer devices, and more particularly to power supplies. [Background technology]

[0002] A computer device typically has multiple Universal Serial Bus (USB) connectors that can supply power to USB devices at a voltage of approximately 5V, typically supplied by a power supply within the computer device.

[0003] However, although a power supply device can supply 5V of power, the power supply voltage sent to the USB device may be less than 5V, or even only 4.7V to 4.8V, because the power supply passes through many elements within the computer device between the power supply device and the USB device. If multiple USB connection terminals within the computer device are connected to different USB devices each requiring power, the power supply voltage may drop further, potentially causing the USB device to operate abnormally. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a power supply device that can meet the power supply requirements of USB devices connected to a computer device and avoid the problem that the power supply voltage of the USB connection terminal of the computer device may be too low. [Means for solving the problem]

[0005] The power supply device of the present invention includes a rectifier circuit, a power supply circuit, a feedback control circuit, and a switch. The rectifier circuit converts AC power into DC power. The power supply circuit is coupled to the feedback control circuit. The switch is coupled to the feedback control circuit. When the switch is in a first mode, the feedback control circuit provides a first feedback voltage to the power supply circuit. The power supply circuit regulates the DC power to a first voltage based on the first feedback voltage, where the first voltage is lower than the DC power supply. When the switch is in a second mode, the feedback control circuit provides a second feedback voltage to the power supply circuit. The power supply circuit regulates the DC power to a second voltage based on the second feedback voltage, where the second voltage is lower than the DC power supply and the second voltage is higher than the first voltage by a predetermined boost value. [Effects of the Invention]

[0006] Based on the above, in an embodiment of the present invention, a switch and a feedback control circuit are arranged at the feedback terminal of the power supply circuit, and the feedback voltage at the feedback terminal of the power supply circuit is adjusted by switching between two modes of the switch, so that the power supply device can provide two voltage levels (e.g., 5V and 5.2V) to the USB connection terminal of the computer device, which can meet the power supply requirements of the USB devices connected to the computer device and avoid the problem that the power supply voltage at the USB connection terminal of the computer device may be too low. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram of a computer device 10 according to the present invention. [Figure 2] 1 is a schematic diagram of a power supply device 200 in accordance with the present invention. [Figure 3] 2 is a detailed schematic diagram of a power supply device 200-1 in accordance with the present invention. [Figure 4] 1 is a schematic view showing the appearance of a power supply device 200-2 according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0008] FIG. 1 is a schematic diagram of a computer system 10 according to the present invention. The computer system 10 includes a power supply 100, a motherboard 102, and one or more universal serial bus (USB) connectors 105. A USB device 110 may be coupled to the USB connector 105. The USB connector 105 in the computer system 10 can supply a 5V voltage Va to the USB device as power. The USB connector 105 may be a USB Type-A connector. The power supply 100 may be an ATX-compliant power supply to provide stable DC power to each component in the computer system 10.

[0009] The voltage Va provided by the power supply device 100 must be transmitted via a power cable (e.g., impedance RR1), a fuse, and a copper foil circuit (e.g., impedance RR2). Furthermore, because an external connection line (e.g., impedance RR3) exists between the USB connection terminal 105 and the USB device 110, a voltage drop occurs across these impedances RR1 to RR3. Therefore, the voltage Vb transmitted to the USB device 110 may experience a voltage drop greater than that of the voltage Va. Furthermore, when multiple USB devices 110 are connected to different USB connection terminals 105, the voltage value of the voltage Vb may decrease. Examples of the USB device 110 include a mouse, a keyboard, a wireless network card, various external hard disks, an optical disk drive, and a smartphone.

[0010] When a USB device 110 performs a high-power operation (e.g., heavy computing load, high-speed data transfer, etc.), a momentary low voltage may occur, which may cause the USB device 110 to malfunction. If the USB connection terminal 105 of the computer device 10 is used as a charging source for the USB device 110, the insufficient voltage Vb may cause the USB device 110 to take a long time to charge.

[0011] In an embodiment of the present invention, a switch and feedback control circuit are disposed within the power supply 100. By switching between two modes of the switch, the feedback voltage of the feedback terminal of the power supply circuit can be correspondingly adjusted, allowing the power supply 100 to provide two voltage levels (e.g., 5V and 5.2V) to the USB connector of a computer device. These two voltage levels are still within the output voltage range compliant with the ATX standard. A user can selectively switch as needed, and the power supply 100 can provide a higher voltage Va to compensate for voltage drops along the power supply path, satisfying the power supply requirements of the USB device 110 connected to the computer device 10 and avoiding the problem of the power supply voltage at the USB connector 105 in the computer device 10 being too low.

[0012] 2 is a schematic diagram of a power supply device 200 in accordance with the present invention. The power supply device 200 may be the power supply device 100 of FIG. 1. The power supply device 200 includes a rectifier circuit 210, a power supply circuit 220, a feedback control circuit 230, and a switch 240.

[0013] The rectifier circuit 210 converts the AC power supply ACIN into a DC power supply (e.g., a voltage having a voltage value of +12 V). The power supply circuit 220 and the switch 240 are coupled to a feedback control circuit 230. When the switch 240 is in a first mode (e.g., an OFF mode), the feedback control circuit 230 provides a first feedback voltage to the power supply circuit 220. The power supply circuit 220 adjusts the DC power supply to a first voltage (e.g., +5 V) based on the first feedback voltage. The voltage value of the first voltage (+5 V) is lower than the voltage value (+12 V) of the DC power supply.

[0014] On the other hand, when the switch 240 is in a second mode (e.g., an ON mode), the feedback control circuit 230 provides a second feedback voltage to the power supply circuit 220. The power supply circuit 220 adjusts the DC power supply to a second voltage (e.g., +5.2V) based on the second feedback voltage. The voltage value of the second voltage (+5.2V) is lower than the voltage value of the DC power supply (+12V), and the voltage value of the second voltage (+5.2V) is higher than the voltage value of the first voltage (+5V) by a predetermined boost value (e.g., 0.2V).

[0015] FIG. 3 is a detailed schematic diagram of a power supply 200-1 in accordance with the present invention. The power supply 200-1 of FIG. 3 is one implementation of the power supply 200 of FIG. 2. The rectifier circuit 210 of FIG. 3 includes a transformer 310, a rectifier 320, and a voltage stabilization circuit 330. The rectifier 320 may be a bridge rectifier. The transformer 310 and the rectifier 320 convert the AC power supply ACIN into DC power and rectify the DC power. The voltage stabilization circuit 330 stabilizes the DC power supply to a predetermined voltage value (+12V).

[0016] The power supply circuit 220 is used, for example, in a power rail controller of 12 V. The power rail controller includes an output terminal vout and a feedback terminal fb.

[0017] 3 further includes a resistor-capacitor circuit 350. The resistor-capacitor circuit 350 is coupled between the output terminal VOUT of the power supply 200-1 and the feedback control circuit 230. In particular, the resistor-capacitor circuit 350 includes a resistor R2 and a capacitor C1. The capacitors C1 and R2 are respectively coupled between the output terminal VOUT and the feedback terminal fb of the power supply 200-1.

[0018] 3 includes a control transistor MN1, a first feedback resistor RFB1, a second feedback resistor REB2, and a resistor R1. A first terminal (e.g., a source terminal) of the control transistor MN1 is coupled to a ground terminal. A control terminal (e.g., a gate terminal) of the control transistor MN1 is coupled to one terminal of a switch 240. The other terminal of the switch 240 is coupled to a ground terminal. A first feedback resistor RR1 is coupled between a second terminal (e.g., a drain terminal) of the control transistor MN1 and a feedback terminal fb of the power supply circuit 220. A second feedback resistor RR2 is coupled between the ground terminal and the feedback terminal fb of the power supply circuit 220.

[0019] When the switch 240 is in a first mode (e.g., an OFF mode), the first and second terminals of the switch 240 are conductive with each other, and the ground voltage of the ground terminal is induced to the control terminal of the control transistor MN1, so that the first and second terminals of the control transistor MN1 are disconnected from each other. Therefore, the load of the feedback terminal fb becomes the second feedback resistor REB2. At this time, the feedback voltage of the feedback terminal fb becomes the first feedback voltage. The power supply circuit 220 adjusts the DC power supply to a first voltage (e.g., +5V) based on the first feedback voltage.

[0020] On the other hand, when the switch 240 is in a second mode (e.g., an on mode), the first and second terminals of the switch 240 are disconnected from each other, and the conduction voltage Vh is induced to the control terminal of the control transistor MN1 via the resistor R1, causing the first and second terminals of the control transistor MN1 to conduct to each other. Therefore, the load on the feedback terminal fb becomes the impedance value obtained when the second feedback resistor REB2 and the first feedback resistor REB1 are connected in parallel. That is, when the switch 240 is in the second mode (e.g., an on mode), the load on the feedback terminal fb decreases, and the voltage value of the feedback voltage at the feedback terminal fb increases to the second feedback voltage. The power supply circuit 220 adjusts the DC power supply to a second voltage (e.g., +5.2 V) based on the second feedback voltage. The voltage value at the feedback terminal fb when the switch 240 is in the first mode is higher than the voltage value at the feedback terminal fb when the switch 240 is in the second mode.

[0021] FIG. 4 is a schematic diagram of the external appearance of a power supply 200-2 in accordance with the present invention. FIG. 4 shows the external appearance of the power supply 200-2 and one implementation method of the power supply 200 of FIG. 2. Referring to FIG. 4, the switch 240-1 can be disposed on the housing of the power supply 200-2. The housing of the power supply 200-2 can include various power terminals, such as a motherboard power terminal, a CPU power terminal, and a hard disk protocol power terminal.

[0022] In summary, in an embodiment of the present invention, a switch and a feedback control circuit are arranged at the feedback terminal of the power supply circuit, and the two modes of the switch can be switched to correspondingly adjust the feedback voltage at the feedback terminal of the power supply circuit, so that the power supply device can provide two voltage levels (e.g., 5V and 5.2V) to the USB connection terminal of a computer device, which can meet the power supply requirements of the USB devices connected to the computer device and avoid the problem that the power supply voltage at the USB connection terminal of the computer device may be too low. [Industrial Applicability]

[0023] The power supply device of the present invention can be applied to computer devices equipped with a USB connection terminal. [Explanation of symbols]

[0024] 10 Computer equipment 100, 200, 200-1, 200-2 power supplies 102 Motherboard 105 USB connection terminal 110 USB device 210 Rectifier circuit 220 Power supply circuit 230 Feedback control circuit 240, 240-1 switches 310 Transformer 320 rectifier 330 Voltage Stabilizer Circuit 340 Power Rail Controller 350 Resistor-Capacitor Circuit ACIN AC power supply VOUT Output terminal of the power supply circuit RR1~RR3 impedance Va, Vb voltage C1 capacitor R1, R2 resistor RFB1 First feedback resistor RFB2 Second feedback resistor Vh Conduction voltage Vout Power rail controller output terminal fb Feedback pin for power rail controller MN1 control transistor

Claims

1. a rectifier circuit that converts AC power into DC power; A power supply circuit; a feedback control circuit coupled to the power supply circuit; a switch coupled to the feedback control circuit; Equipped with When the switch is in a first mode, the feedback control circuit provides a first feedback voltage to the power supply circuit, and the power supply circuit adjusts the DC power supply to a first voltage, the voltage value of which is lower than a voltage value of the DC power supply, based on the first feedback voltage; When the switch is in the second mode, the feedback control circuit provides a second feedback voltage to the power supply circuit, and the power supply circuit adjusts the DC power supply to a second voltage based on the second feedback voltage, the second voltage having a voltage value lower than the voltage value of the DC power supply and higher than the voltage value of the first voltage by a predetermined boost value. power supply.

2. the first mode of the switch is an off mode of the switch; the second mode of the switch is an on mode of the switch. The power supply device of claim 1 .

3. The rectifier circuit includes: A transformer and a rectifier that converts the AC power source into the DC power source together with the transformer; a voltage stabilization circuit that stabilizes the DC power supply to a predetermined voltage value; 10. The power supply of claim 1, comprising:

4. The feedback control circuit includes: a control transistor having a first terminal coupled to a ground terminal and a control terminal coupled to one end of the switch; a first feedback resistor coupled between the second end of the control transistor and a feedback terminal of the power supply circuit; a second feedback resistor coupled between the ground terminal and the feedback terminal of the power supply circuit; Including, the other terminal of the switch is coupled to the ground terminal; a voltage value at the feedback terminal of the power supply circuit when the switch is in the first mode is higher than a voltage value at the feedback terminal when the switch is in the second mode; The power supply device of claim 1 .

5. The voltage value of the DC power supply is 12 V, and the voltage value of the first voltage is 5 V. The power supply device of claim 1 .

6. The voltage value of the second voltage is 5.2V, and the predetermined boost value is 0.2V.

6. The power supply device according to claim 5.

7. the rectifier in the rectifier circuit is a bridge rectifier; The power supply device of claim 1 .

8. the power supply is located within a computer device; the computer device includes a motherboard; the motherboard includes a plurality of universal serial bus (USB) connection terminals; The power supply device of claim 1 .

9. The universal serial bus (USB) connection terminal is USB Type-A.

9. The power supply device of claim 8.

10. The switch is disposed on a housing of the power supply. The power supply device of claim 1 .

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