TWI239159B - Ethernet interface card and fast power switch circuit thereof - Google Patents

Abstract

An ETHERNET interface card and a fast power switch circuit thereof are provided. A voltage level divider is used to generate a control signal by dividing the voltage level of a control power source. The control signal is used to control a power switch and a transistor to switch power between the first power source and the second power source. Therefore, the wake-on-LAN function of the ETHERNET interface card is achieved.

Description

1239159 V. Description of the invention (1) The technical field to which the invention belongs The present invention relates to an interface card > and more particularly to an Ethernet interface card and a fast power switching control circuit therein. Developed computers and the digitization of various information δ are also widely used. In order to achieve the sharing of resources, the network has become a necessary configuration for information exchange. In various different network architectures, 5 Ethernet has Obtain the characteristics of easy installation and fast transmission speed, which make the Ethernet related 5 ready to flourish and its transmission rate also evolved from 10Mbps to 10 OMbp S ft to 1 Gbps; 〇Ethernet—η »a Including hub switches and Ethernet interface cards. In the interface card, in order to be able to wake up even when the computer with the Ethernet interface card enters the power-saving sleep mode or shuts down, it can be woken up by a remote computer connected to the Ethernet network, which is also called wake-on-network (Wake on LAN) work ^ 1 because of j ratio, will be J 会 j book--fast 'power switching control circuit y to quickly switch to auxiliary power when normal power is lost, so that auxiliary power can continue to supply Ethernet The power required by the network interface card allows the Ethernet interface card to wait to receive a wake-up command from a remote computer. When the Ethernet interface card receives a wake-up command from a remote computer and quickly wakes up the computer The switching control circuit can quickly switch back to normal power to fully supply the power required for the full function of the Ethernet interface card. Please refer to Figure 1, which is a diagram of the conventional fast power switching control circuit. This known fast power switching control circuit 100 is used for

11782twf.ptd Page 7 1239159 V. Description of the invention (2) Ethernet interface card with PCI (Peripheral Component Interconnection) interface to support the wake-up function of the Ethernet interface card. The figure shows that the conventional fast power switching control circuit 100 includes: a power conditioner switching switch 110 and a P-type metal-oxide semiconductor transistor 120. Among them, the V c C pin of the power conditioner switch 110 is usually connected to the input power of the PCI 5 V, so as to adjust the input power of the PCI 5 V to 3 · 3 V and output it through the V 0ut pin, and According to the presence or absence of the input power of PCI 5V, a driving signal is output through the DRIVE * pin to control the conduction of the P-type metal-oxide semiconductor transistor 1 2 0, so as to achieve a fast speed between PCI 5 V and PCIV au X power. Switching function. However, in addition to the instability caused by this type of circuit due to heat generation, the component cost of an Ethernet interface card with a reduced price also appears to be too high. SUMMARY OF THE INVENTION In view of this, the present invention provides an Ethernet interface card and a fast power switching control circuit therein. Its component selection is highly flexible, and it meets the requirements of low cost. To achieve the above and other objectives, the present invention provides an Ethernet interface card and a fast power switching control circuit therein. The Ethernet interface card in addition to the Ethernet controller required to support the operation of the Ethernet function, also includes a fast power switching control circuit to support the wake-up function of the Ethernet interface card, The fast power switching control circuit will switch power between the first power source and the second power source to the Ethernet controller according to a control power source. According to this, the fast power switching control circuit includes: a voltage dividing unit, a power supply

11782twf.ptd Page 8 1239159_ V. Description of the invention (3) Switch and transistor. Among them, the voltage dividing unit is used for dividing the aforementioned control power to generate a control signal. The power switch is coupled to the voltage dividing unit to control the level according to one of the control signals to select the first power source to supply power. The transistor is also coupled to the voltage dividing unit, and is selected to be powered by the second power source according to the level of the control signal opposite to the aforementioned control level. That is, the switching power supply between the first power source and the second power source is selected by controlling the presence or absence of the power source. In one embodiment, the voltage dividing unit includes a first resistor and a second resistor connected in series. In another embodiment, the voltage dividing unit further includes a capacitor in parallel with the first resistor to accelerate its switching. In one embodiment, the transistor used is a P-type metal-oxide semiconductor. As can be seen from the above description, an Ethernet interface card provided by the present invention and the fast power switching control circuit therein do not need to use an expensive power conditioner switching switch, and replace it with a voltage dividing unit and a general Power switch, so its component selection is highly flexible, and it meets the requirements of low cost. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a detailed description is given below with preferred embodiments and the accompanying drawings as follows: Implementation: Please refer to FIG. 2 It is a fast power switching control circuit diagram according to a preferred embodiment of the present invention. As shown, this fast power switch

11782twf.ptd Page 9 1239159 V. Description of the invention (4) The control circuit 2 0 0 is used to switch between the first power supply PCI 3.3V and the second power supply PCI Vaux according to the presence or absence of the control power supply PC I 1 2 V. Power is supplied to the Ethernet controller (not shown), and the wake on LAN function of the Ethernet interface card is supported. As shown in the figure, this fast power switching control circuit 2 includes: Voltage unit 2 1 0, power switch 2 2 0 and transistor 2 3 0. The voltage dividing unit 2 1 0 includes a first resistor 2 1 1, a second resistor 2 1 2, and a capacitor 2 1 3 connected in parallel with the first resistor 2 1 1. The capacitor 2 1 3 can be used in the control power supply PCI. When the 12 V changes, it accelerates the switching of the fast power switching control circuit 2000, and can make the control of the shutdown operation of the power switching switch 220 and the transistor 230 more complete. As shown in the figure, the first resistor 2 1 1 and the second resistor 2 12 divide the control power PCI 12V and generate a control signal Scontrol. Therefore, the power switch 2 2 0 'used in the embodiment whose control pin c E will turn on its input power & source pin V i η and output power when the control level of the control signal Scontrol is high. Pin V 0ut, that is, the selection at this time is powered by the first power supply PCI 3. 3V. Therefore, this fast power switching control circuit 2000 should cooperate with the selected transistor 230. It is a P-type metal-oxide semiconductor, which can receive the control signal S c ο ntr ο 1 at a high level. At this time, the power transmission path of the second power supply PCI Vaux is closed to match the selection of the first power supply pci 3 3V for power supply. ', · In addition' When the control power supply PCI 1 2 V disappears, the control signal S c ο ntr ο 1 received by the control pin CE of the power switch 2 2 〇 will be a low level and will be turned off Its input power pin V i η and output power pin

Page 10 1239159_ V. Description of the invention (5)

V 〇 u t power transmission path. At this time, the transistor 230 will turn on the power transmission path of the second power supply PCI V au X because the control level of the received control signal S control is low, that is, the selection at this time is determined by the second Powered by PCI Vaux.

It is known that the fast power switching control circuit 2000 can quickly switch the power supply between the first power supply PCI 3.3V and the second power supply PCI V a u X according to the presence or absence of the control power supply PCI 12V. In the foregoing description, it is assumed that the fast power switching control circuit 200 is applied to an Ethernet interface card of a PCI interface, so as to achieve a power-saving sleep mode or shutdown when a computer with the Ethernet interface card is inserted, and When the main power supply PC I 3.3 V of the PCI slot disappears, it can be switched by this fast power switching control circuit 2000, and the computer is powered by the 3.3 V auxiliary power supply PCIV au X of the PCI slot. So that the Ethernet controller on the Ethernet interface card can still receive the wake-up command from the remote computer. When the computer with this Ethernet interface card receives the wake-up command from the remote computer, it can wake it up and switch the power supply back to the main power of P C I 3. 3 V to achieve the so-called network wake-up function. Therefore, in the embodiment, the control power PC I 12 V can actually be controlled by a power source synchronized with PCI 3.3V, such as PCI 5V, or PCI 3.3V itself. In summary, the present invention has at least the following advantages: 1. The voltage of the control power supply can be adjusted at will, which is convenient for cooperating with different circuits and selecting appropriate components. 2. Because there is no need to use the expensive power conditioner switch, its component selection is highly flexible, and it is very suitable for low cost requirements.

11782twf.ptd Page 11 1239159_ V. Description of the Invention (6) Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art will not depart from the spirit and scope of the present invention In addition, various modifications and retouching can be made, so the protection scope of the present invention shall be determined by the scope of the appended patent application.

11782twf.ptd Page 12 1239159_ Brief Description of Drawings Figure 1 shows a conventional fast power switching control circuit diagram; and Figure 2 shows a fast power switching control circuit diagram according to a preferred embodiment of the present invention. Description of the graphic symbols: 10 0 The conventional fast power switching control circuit 110 The power regulator switching switch 120 P type metal oxide semiconductor transistor 2 ◦ 0 The fast power switching control circuit 2 1 0 The voltage dividing unit 2 11 The first resistor 2 1 2 2nd resistor 2 1 3 capacitor 2 2 0 power switch 2 3 0 transistor

11782twf.ptd Page 13

Claims (1)

1239159_ VI. Scope of patent application 1. An Ethernet interface card, comprising: an Ethernet controller; and a fast power switching control circuit, which is suitable for controlling a power source based on a first power source and a first power source The power supply is switched between two power sources to the Ethernet controller. The fast power switching control circuit includes: a voltage dividing unit for dividing the control power to generate a control signal; a power switching switch coupled to the voltage dividing A unit for controlling the level according to one of the control signals to select to be powered by the first power source; and a transistor coupled to the voltage dividing unit for controlling the level of the control signal opposite to the control level Level to select to be powered by the second power source. 2. The Ethernet interface card according to item 1 of the scope of patent application, wherein the voltage dividing unit comprises a first resistor and a second resistor connected in series. 3. The Ethernet interface card according to item 2 of the scope of patent application, wherein the voltage dividing unit further includes a capacitor in parallel with the first resistor. 4. The Ethernet interface card as described in item 1 of the scope of patent application, wherein the transistor is a P-type metal-oxide semiconductor transistor. 5. A fast power switching control circuit suitable for switching power supply between a first power source and a second power source according to a control power source, including: a voltage dividing unit for generating a control by dividing the control power source A signal; a power switch that is coupled to the voltage division unit to control the level according to one of the control signals to select power from the first power source; and a transistor that is coupled to the voltage division unit to Basis and the control level 11782twf.ptd Page 14 1239159_ VI. Scope of patent application Contrary to the level of the control signal, in order to choose to be powered by the second power supply. 6. The fast power switching control circuit according to item 5 of the scope of patent application, wherein the voltage dividing unit includes a first resistor and a second resistor connected in series. 7. The fast power switching control circuit according to item 6 of the patent application scope, wherein the voltage dividing unit further comprises a capacitor in parallel with the first resistor. 8. The fast power switching control circuit according to item 5 of the scope of patent application, wherein the transistor is a p-type metal-oxide semiconductor. 11782twf.ptd Page 15