TW201310046A - Electric leakage detecting circuit and motherboard having the same - Google Patents

Abstract

An electric-leakage detecting circuit and a motherboard having the same are provided in the present disclosure. In power-on mode, the electric-leakage detecting circuit may turn on the power light. In power-off mode, the electric-leakage detecting circuit may also turn on the power light if an operation voltage source received by the motherboard is greater than a predetermined voltage value and may turn off the power light if the operation voltage source is less than the predetermined voltage value. In other words, the power light is able to indicate whether the electric leakage occurs on the motherboard.

Description

Leakage detection circuit and motherboard having the same

The present invention relates to a power supply detecting circuit for a motherboard, and more particularly to a leakage detecting circuit for a motherboard.

The Advanced Configuration and Power Interface (ACPI) is a computer power management specification developed by Intel, Microsoft, Phoenix, HP and Toshiba to allow the operating system to directly manage the power state of various devices. Through ACPI's power management, you can control the computer's power switch through an operating system such as Windows, or you can use a hardware signal to wake up or shut down the system.

The ACPI includes the following operation modes. In short, S0 is in a normal working state; S1, S2, S3, and S4 are in a sleep mode; and S5 is in a shutdown mode. The operating power of the motherboard, including the standby power supply (SB3.3V or SB5V) and the working power supply (3.3V or 5V), will have different power supply modes depending on the operating mode. For example, in S0 mode, all working power and working power are output normally; in S1, S2, S3, and S4 modes, there will be corresponding standby power output; in S5 mode, work on the motherboard. The power and standby power should stop outputting.

Generally, the motherboard may generate leakage in the S5 state, and the standby power supply (SB 5V or SB 3.3V) is recharged to the main power supply (VCC 5V or VCC 3.3V) to damage the power supply or circuit, causing the system to fail to boot or function. abnormal. This may be caused by a bad design of the motherboard or a poorly designed design card. The average user cannot easily find the leakage problem.

The invention provides a leakage detecting circuit, which can be used for detecting whether a power leakage occurs on a motherboard, and uses a power light of a computer to display a power state during power-on and whether there is leakage during shutdown. Allows the user to directly determine whether the motherboard is leaking or not via the power light.

The invention provides a leakage detecting circuit, which is suitable for detecting a power state of a motherboard, and displaying the power state via a power light signal, wherein the power leakage detecting circuit turns on the power supply in a power supply mode. a light source; in a shutdown mode, if a working power source on the motherboard is greater than a predetermined voltage value, the leakage detecting circuit turns on the power light signal, and if the working power source is less than the preset voltage value, The leakage detection circuit turns off the power light number.

The invention further provides a motherboard, which is characterized in that it comprises a leakage detecting circuit, which is suitable for detecting a power state of the motherboard, and displaying the power state via a power light signal. In a power supply mode, the leakage detecting The measuring circuit turns on the power light signal; in a shutdown mode, if a working power source on the motherboard is greater than a predetermined voltage value, the leakage detecting circuit turns on the power light signal, if the working power source is smaller than the preset The voltage value is used to turn off the power signal.

In summary, the present invention utilizes a leakage detection circuit to allow the power supply lamp to display information on whether the motherboard is leaking, so that the user can conveniently check the power state of the motherboard and find out the cause of the failure.

The above described features and advantages of the present invention will be more apparent from the following description.

In the following, the invention will be described in detail by the embodiments of the invention, and the same reference numerals are used in the drawings.

FIG. 1 is a schematic diagram of a motherboard according to an embodiment of the present invention. The motherboard 100 includes a leakage detecting circuit 110, which can be used to detect whether the motherboard 100 has a leakage problem. The motherboard 100 can receive power via a power outlet for powering internal circuitry. The leakage detecting circuit 110 is connected to the power light number 120, and adjusts the light number display of the power light number 120 according to the detected power state. In the normal power supply mode, the leakage detecting circuit 110 turns on the power light number 120 to indicate that the power supply is normally powered. In the shutdown mode, if the working power supply on the motherboard 100 has abnormal power supply, for example, the working power is greater than the preset voltage value, the leakage detecting circuit 110 turns on the power light 120 to notify the user of the motherboard 100. There may be abnormal leakage conditions. If the operating power is less than the preset voltage value, the leakage detecting circuit 110 turns off the power light 120, as in the normal shutdown mode. In other words, the user can know whether there is a leakage problem in the shutdown mode via the power light of the computer, so as to facilitate the maintenance of the computer and the leakage of the power supply to the normal power source to cause damage.

The specifications of the motherboard 100 are, for example, AT (Advanced Technology), Baby-AT, ATX (Advanced Technology Extended), microATX, FlexATX, Mini-ITX, Nano-ITX, Pico-ITX, mobile-ITX, BTX (Balanced Technology Extended). MicroBTX, PicoBTX, DTX, Mini-DTX, ETX, Extended ATX, LPX, Mini-LPX, PC/104, PC/104plus, NLX, WTX, XTX, etc., but the invention is not limited thereto.

The power socket on the motherboard 100 is, for example, an ATX power socket or an AT power socket. The motherboard 100 of different specifications has different power sockets for different power plugs, and the present invention is not limited thereto. Take the ATX power socket as an example, including ATX 20-pin power socket, ATX12V 20-pin main power socket and 4-pin auxiliary socket, ATX12V 2.0 24-pin main power socket and 4-pin auxiliary power socket, ATX12V 2.2 20/24-pin main power socket and The 8-pin to 4-pin auxiliary power socket and the like do not limit the power socket specification of the motherboard 100. The power source lamp 120 is, for example, a light emitting diode, but the present invention is not limited thereto. Power management of the motherboard 100 can also support Advanced Configuration and Power Interface (ACPI) for software and hardware power management.

In computer applications, such as desktop computers, notebook computers, tablets, or smart phones, there are two main types of power management modes, one is APM and the other is ACPI. ACPI is a higher-order power management mode than APM, which saves more power by using ACPI mode.

Take ACPI's power mode as an example, which includes modes such as S0, S1, S2, S3, S4, and S5. The power configuration will be set according to different power modes to reduce power saving. In the shutdown mode, such as S5 mode, the general working power supply and the standby power supply are turned off to reduce the power consumption. If the power supply on the motherboard 100 is detected to be abnormally powered in the S5 mode, the power supply is indicated. There may be a leakage condition. The leakage detecting circuit 110 turns on the power light number 120 to notify the user that an abnormal condition has occurred. Detailed ACPI power mode description can refer to ACPI specifications, and will not be described here.

The power supply received by the leakage detecting circuit 110 includes the operating power sources VCC3 (3.3V), VCC5 (5V), 5V_DUAL and standby power SB3V (3.3V standby), and SB5V (5V standby). The working power supply 5V_DUAL is a so-called dual voltage design. When the power is not supplied, it is powered by the standby power supply SB5V. After being energized, it is powered by the working power supply VCC5. In other words, as long as the standby power supply SB5V or the operating power supply VCC5 has power, the operating power supply 5V_DUAL will be powered. The working power supply 5V_DUAL is mainly powered to devices such as USB (Universal Serial Bus) or PS/2. In addition, the operation of 3V_DUAL (not shown) is also supplied in the same manner. The voltage specifications of the working power supply VCC3 (3.3V), VCC5 (5V), 5V_DUAL and standby power SB3V (3.3V standby), SB5V (5V standby) can refer to the ATX power supply specifications, and will not be described here.

Please refer to FIG. 2 at the same time, which illustrates a circuit diagram of the leakage detecting circuit 110 of the embodiment of the present invention. The working power supply 5V_DUAL has power only in the S0 and S3 modes (also called the power-on mode). In the S5 mode, the working power supply 5V_DUAL is turned off. In the S5 mode, if the sense signal SS is detected to be a logic high (High), it indicates that the motherboard 100 has a leakage state. In the present embodiment, the operating power supply 5V_DUAL is regarded as the normal operating power supply in the S0 mode, and the LED (the power supply lamp number 120) can be illuminated, and in the shutdown mode, the LED should not be illuminated. In the shutdown mode, if the sensing signal SS is logic high (High), indicating that VCC3 and VCC5 are greater than the preset voltage, the leakage detecting circuit 110 turns on the power light 120 to inform the user that a potential leakage may occur. When it is detected that the sensing signal SS is logic low (Low), it indicates that VCC3 and VCC5 are less than the preset voltage, the leakage detecting circuit 110 does not turn on the power signal in the S5 mode.

The leakage detecting circuit 110 includes a power comparison unit 112 and a signal driving unit 114. The power comparison unit 112 includes resistors R1 to R4, comparators CP1, CP2, and OR gate 210. The resistors R1 and R2 are coupled in series between the standby power source SB3V and the ground GND to generate a voltage divider. The resistors R3 and R4 are coupled in series between the standby power source SB3V and the ground GND to generate a voltage division. The comparator CP1 is configured to compare the divided voltage of the standby power supply SB3V with the operating power supply VCC3, and the output end thereof is coupled to the input end of the OR gate 210. The comparator CP2 is configured to compare the divided voltage of the standby power supply SB3V with the operating power supply VCC5, and the output end thereof is coupled to the input end of the OR gate 210. The output end of the OR gate 210 is coupled to the signal driving unit 114.

The signal driving unit 114 includes two diodes D1 and D2. The anode of the diode D1 is coupled to the output of the OR gate 210, and the anode of the diode D2 is coupled to the operating power supply 5V_DUAL. The cathode ends of the diodes D1 and D2 are coupled to each other and can be connected to the power source lamp 120 and the resistor R5 via a jumper JP (jumper). The lamp driving unit 114 can control whether to switch the power source lamp 120 according to the sensing signal SS and the operating power source 5V_DUAL. When the working power source VCC3, VCC5 or 5V_DUAL is found to be high, the lamp driving unit 114 turns on the power lamp number 120. The user can judge whether the power of the system is operating normally or leaking by the state of the power light number 120.

The power supply comparison unit 112 compares the operational power sources VCC3, VCC5 with the standby power source SB3V, and outputs the sensing signal SS accordingly. In the power supply mode, as long as one of the operating power supplies VCC3, VCC5 is powered, the power comparison unit 112 outputs a positive potential sensing signal SS. The diode D1 in the lamp driving unit 114 is turned on by the sensing signal SS to turn on the power lamp number 120. In the shutdown mode, the working power supply VCC3, VCC5, 5V_DUAL should be no power supply. If the working power supply VCC3, VCC5 is leaking or the working power supply 5V_DUAL is greater than the turn-on voltage of the diode D2 (about 0.7V), the power supply signal 120 will also be turned on. The user can know the problem of leakage of the operating power sources VCC3, VCC5, and 5V_DUAL of the motherboard 100 via the power source lamp 120. It is worth noting that the leakage detection of the working power supply VCC3 and VCC5 needs to be performed under the condition that the standby power supply SB5V (power supply to the comparators CP1 and CP2) is powered, and the working power supply 5V_DUAL is independent of other power supplies. The light 120 will be turned on.

In addition, the power supply comparison unit 112 may directly use the standby power source SB5V to generate a divided voltage to be compared with the operating power sources VCC3, VCC5. In other words, the resistors R1 and R2 can be coupled in series between the standby power source SB5V and the ground GND to generate a voltage divider. The resistors R3 and R4 can be coupled in series between the standby power source SB5V and the ground GND. A partial pressure is generated. The comparators CP1 and CP2 are used to compare the divided voltages of the standby power supply SB5V with the operating power supplies VCC3 and VCC5, respectively. The resistance values of the resistors R1 R R4 can be adjusted according to the design requirements to generate the required partial pressure. After the description of the above embodiments, those skilled in the art should be able to infer the implementation manner, and no further description is provided herein. .

In this embodiment, the turn-on voltages of the diodes D1 and D2 are regarded as preset voltage values, and the operating power sources VCC3 and VCC5 are the operating power sources to be sensed. As long as the voltage of the working power sources VCC3 and VCC5 is excessively detected in the shutdown mode, the power source number 120 is turned on. The diodes D1, D2 are, for example, Schottky diodes, which can be realized by using a specially packaged wafer, such as FAIRCHILD SEMCONDUCTOR, model BAT54C, but the invention is not limited thereto.

It should be noted that in another embodiment of the present invention, the diodes D1 and D2 in the lamp driving unit 114 can also be replaced by a transistor, for example, an abbreviation of an NPN bipolar junction transistor or an NMOS transistor. (N channel metal-oxide-semiconductor field-effect transistor). Taking an NMOS transistor as an example, the gate and the drain can be connected to the output of the OR gate 210, and the source is connected to the power supply lamp 120. Similarly, the diode D2 can also be replaced by an NMOS transistor.

The leakage detecting circuit 110 can be used to detect different working power sources, such as 3V_DUAL, 5V or 12V, and the present invention does not limit the type of operating power. With the leakage detecting circuit 110 of the present invention, the motherboard 100 can detect whether a plurality of working power sources and standby power sources received through the power connector are normal, and display the power state via the power light number 120 of the computer. In other words, the power lamp number 120 can have two functions. In the normal power supply mode, the display power supply is normal; in the power off mode, it can be used to display whether the motherboard 100 has leakage. The above-mentioned working power supply VCC3, VCC5 or 5V_DUAL is represented by its voltage level. The leakage detecting circuit 110 also determines whether or not there is leakage by comparing the voltage levels of the individual operating power sources. After the description of the above embodiments, those skilled in the art should be able to deduce the embodiments thereof, and no further details are provided herein.

The leakage detecting circuit 110 can adjust the coupling mode of different power sources according to design requirements, for example, swapping the working power source VCC3 and the working power source 5V_DUAL, or swapping the working power source VCC5 and the working power source 5V_DUAL, which is not limited in this embodiment. After the description of the above embodiments, those skilled in the art should be able to deduce the embodiments thereof, and no further details are provided herein.

In addition, it is to be noted that the coupling relationship between the above elements includes a direct or indirect electrical connection as long as the desired electrical signal transfer function can be achieved, and the invention is not limited. The technical means in the above embodiments may be combined or used alone, and the components may be added, removed, adjusted or replaced according to their functions and design requirements, and the invention is not limited. After the description of the above embodiments, those skilled in the art should be able to deduce the embodiments thereof, and no further details are provided herein.

In summary, the leakage detecting circuit of the present invention can display the power state of the motherboard under the power-off state, so that the user can conveniently determine whether the motherboard has leakage.

Although the preferred embodiments of the present invention have been disclosed as above, the present invention is not limited to the above-described embodiments, and any one of ordinary skill in the art can make some modifications without departing from the scope of the present invention. The scope of protection of the present invention should be determined by the scope of the appended claims.

100. . . motherboard

110. . . Leakage detection circuit

112. . . Power comparison unit

114. . . Light drive unit

120. . . Power light

210. . . Gate

VCC3, VCC5, 5V_DUAL. . . Working power

SB3V, SB5V. . . Standby power

R1~R5. . . resistance

CP1, CP2. . . Comparators

GND. . . Ground terminal

D1, D2. . . Dipole

SS. . . Sense signal

FIG. 1 is a schematic diagram of a motherboard according to an embodiment of the present invention.

FIG. 2 is a schematic circuit diagram of a leakage detecting circuit 110 according to an embodiment of the present invention.

110. . . Leakage detection circuit

112. . . Power comparison unit

114. . . Light drive unit

120. . . Power light

210. . . Gate

VCC3, VCC5, 5V_DUAL. . . Working power

SB3V, SB5V. . . Standby power

R1~R5. . . resistance

CP1, CP2. . . Comparators

GND. . . Ground terminal

D1, D2. . . Dipole

SS. . . Sense signal

Claims (10)

A leakage detecting circuit is configured to detect a power state of a motherboard, and display the power state via a power light signal, wherein the power leakage detecting circuit turns on the power light signal in a power supply mode; In a shutdown mode, if a working power source on the motherboard is greater than a predetermined voltage value, the leakage detecting circuit turns on the power light signal, and if the working power source is less than the preset voltage value, the leakage detecting The circuit turns off the power light. The leakage detecting circuit of claim 1, wherein the leakage detecting circuit comprises: a power comparing unit for comparing a standby power source with a first working power source, and comparing the standby power source with a second Working a power supply, and outputting a sensing signal according to the signal; and a light driving unit coupled to the power comparing unit and the working power source, and controlling the power light signal according to the sensing signal; wherein, In the power supply mode, the light source driving unit turns on the power light signal; in the power off mode, if the working power source is greater than the preset voltage value, the light source driving unit turns on the power light signal, if the working power source is less than When the preset voltage value is reached, the light source driving unit turns off the power light signal. The leakage detecting circuit of claim 2, wherein the power comparison unit comprises: a first comparator for comparing a voltage division of the standby power source with the first operating power source; and a second comparator, Comparing a partial voltage of the standby power supply with the second working power supply; and an OR gate having two inputs coupled to the output of the first comparator and the output of the second comparator, respectively, and an output thereof The sensing signal is output. The leakage detecting circuit of claim 3, wherein the signal driving unit comprises: a first diode having an anode connected to the output end of the gate; a second diode having an anode Connected to the working power source, the cathode is coupled to the cathode of the first diode and a first end of the power lamp; and a resistor coupled to a second end and a ground of the power lamp Wherein, the power light is a light emitting diode. The leakage detecting circuit of claim 3, wherein the standby power source is a 3.3V standby power supply or a 5V standby power supply; the first working power supply is a 3.3V working power supply; and the second working power supply is a 5V working power supply; The working power supply is a 5V_DUAL working power supply. The leakage detection circuit of claim 1, wherein the shutdown mode comprises a mode S5 in the advanced configuration and the power interface; and a boot mode includes modes S0 and S3 in the advanced configuration and power interface, The working power supply is a 5V_DUAL working power supply. The leakage detecting circuit of claim 4, wherein the first diode and the second diode are Schottky diodes. A motherboard includes a leakage detecting circuit configured to detect a power state of the motherboard and display the power state via a power light signal. In a power supply mode, the leakage detecting circuit turns on the power board. a power light signal; in a shutdown mode, if a working power source on the motherboard is greater than a predetermined voltage value, the leakage detecting circuit turns on the power light signal, and if the working power source is less than the preset voltage value, The leakage detecting circuit turns off the power light number. The motherboard of claim 8, wherein the leakage detecting circuit comprises: a power comparison unit for comparing a standby power supply with a first working power supply, and comparing the standby power supply with a second working power supply And outputting a sensing signal according to the same; and a light driving unit coupled to the power comparing unit and a working power source, and controlling the power light according to the sensing signal and the working power; wherein, in a boot mode The light source driving unit turns on the power light signal; in the power off mode, if the working power source is greater than the preset voltage value, the light source driving unit turns on the power light signal, if the working power source is less than the preset When the voltage value is set, the signal driving unit turns off the power light number. The motherboard of claim 9, wherein the power comparison unit comprises: a first comparator for comparing a partial voltage of the standby power source with the first working power source; and a second comparator for Comparing the divided voltage of the standby power supply with the second working power supply; and an OR gate having two inputs coupled to the output of the first comparator and the output of the second comparator, respectively, the output terminal outputs the output Sensing signal.