CN112148101A - Power supply protection circuit and mainboard applying same - Google Patents
Power supply protection circuit and mainboard applying same Download PDFInfo
- Publication number
- CN112148101A CN112148101A CN201910580487.8A CN201910580487A CN112148101A CN 112148101 A CN112148101 A CN 112148101A CN 201910580487 A CN201910580487 A CN 201910580487A CN 112148101 A CN112148101 A CN 112148101A
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- power supply
- resistor
- electronic switch
- protection circuit
- terminal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a mainboard which comprises a south bridge chip, a power supply module and a power protection circuit. The power supply protection circuit is electrically connected between the south bridge chip and the power supply module; the south bridge chip is used for outputting a corresponding state signal according to the state of the mainboard; the power supply module is used for supplying power to the mainboard; the power supply protection circuit comprises a control module and a discharging module, wherein the control module is used for receiving a state signal output by the south bridge chip; the discharging module is electrically connected between the control module and the power supply module. When the mainboard is in a non-working state, the south bridge chip outputs a state signal of a first level to the control module, and the control module controls the discharging module to discharge the power supply module according to the state signal of the first level. Therefore, when the mainboard is switched from the working state to the non-working state, the electronic elements of the mainboard can be prevented from being burnt.
Description
Technical Field
The invention relates to a power supply protection circuit and a mainboard applying the same.
Background
Generally, a computer motherboard provides various power supplies to power the electronic components on the motherboard, such as 12V, 5V, and 3.3V. These power supplies are typically grounded through capacitors to filter out noise in the power supplies.
When the computer mainboard is switched from the working state to the non-working state, the electric energy stored by the capacitor can be released to the electronic elements of the mainboard, thereby burning the electronic elements of the mainboard.
Disclosure of Invention
In view of the above, it is desirable to provide a power protection circuit and a motherboard using the same, which can discharge power to the motherboard when the motherboard is switched from an operating state to a non-operating state, so as to prevent electronic components of the motherboard from being burned.
A kind of power protection circuit, apply to the mother board, the said mother board includes south bridge chip and power supply module, the said south bridge chip is used for detecting the state of the said mother board, and output the corresponding status signal according to the state of the said mother board, the said power supply module is used for supplying power for the said mother board, the said power protection circuit includes:
the control module is electrically connected to the south bridge chip to receive the state signal output by the south bridge chip; and
the discharging module is electrically connected between the control module and the power supply module;
when the mainboard is in a non-working state, the south bridge chip outputs a state signal of a first level to the control module, and the control module controls the discharging module to discharge the power supply module according to the state signal of the first level.
Further, when the motherboard is in a working state, the south bridge chip outputs a state signal of a second level to the control module, and the control module controls the discharging module not to discharge the power supply module according to the state signal of the second level.
Furthermore, the power supply module includes a first power supply, a second power supply, a third power supply, a first capacitor, a second capacitor, and a third capacitor, where the first power supply, the second power supply, and the third power supply are all used to supply power to the motherboard, the first power supply is grounded through the first capacitor, the second power supply is grounded through the second capacitor, and the third power supply is grounded through the third capacitor.
Further, the discharging module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor, the first resistor, the second resistor, the third resistor and the fourth resistor are connected in parallel to discharge the first capacitor, the fifth resistor and the sixth resistor are connected in parallel to discharge the second capacitor, and the seventh resistor and the eighth resistor are connected in parallel to discharge the third capacitor.
Further, the control module includes a first electronic switch, a second electronic switch, a third electronic switch and a first resistor, a first end of the first electronic switch is electrically connected to a first end of the second electronic switch and a first end of the third electronic switch, the first end of the first electronic switch is electrically connected to the south bridge chip through the first resistor and is configured to receive the status signal output by the south bridge chip, second ends of the first electronic switch, the second electronic switch and the third electronic switch are all grounded, a third end of the first electronic switch is electrically connected to one end of the fourth resistor, a third end of the second electronic switch is electrically connected to one end of the sixth resistor, and a third end of the third electronic switch is electrically connected to one end of the eighth resistor.
Further, the control module further comprises a tenth resistor, and the first end of the first electronic switch is grounded through the tenth resistor.
Further, the first electronic switch, the second electronic switch and the third electronic switch are all N-channel enhancement type field effect transistors.
Furthermore, the first terminal, the second terminal, and the third terminal of the first electronic switch correspond to the gate, the source, and the drain of the N-channel enhancement type fet, respectively, the first terminal, the second terminal, and the third terminal of the second electronic switch correspond to the gate, the source, and the drain of the N-channel enhancement type fet, respectively, and the first terminal, the second terminal, and the third terminal of the third electronic switch correspond to the gate, the source, and the drain of the N-channel enhancement type fet, respectively.
Further, the first power supply is configured to output a voltage of 12 volts, the second power supply is configured to output a voltage of 3.3 volts, and the third power supply is configured to output a voltage of 5 volts.
A mainboard comprises a south bridge chip, a power supply module and the power supply protection circuit, wherein the power supply protection circuit is electrically connected between the south bridge chip and the power supply module, the south bridge chip is used for detecting the state of the mainboard, and the power supply protection circuit is used for discharging the power supply module when the mainboard is in a non-working state.
The mainboard detects the working state of the mainboard through the south bridge chip and controls the discharging module in the power supply protection circuit to discharge the power supply module when the mainboard is in an abnormal working state through the control module in the power supply protection circuit. Therefore, when the mainboard is switched from the working state to the non-working state, the electronic elements of the mainboard can be prevented from being burnt.
Drawings
Fig. 1 is a block diagram of a motherboard according to a preferred embodiment of the present invention.
Fig. 2 is a block diagram of a preferred embodiment of the power protection circuit of fig. 1.
Fig. 3 is a circuit diagram of a preferred embodiment of the power protection circuit of fig. 1.
Description of the main elements
South bridge chip 10
Resistors R1, R2, R3, R4, R5, and,
R6、R7、R8、R9、R10
Capacitors C1, C2 and C3
Electronic switches Q1, Q2, Q3
Power supplies V1, V2, V3
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the power protection circuit and the motherboard using the power protection circuit of the present invention will be described in detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1, a motherboard 100 according to a preferred embodiment of the present invention includes a south bridge chip 10, a power protection circuit 20, and a power supply module 30.
The power protection circuit 20 is electrically connected between the south bridge chip 10 and the power supply module 30. The south bridge chip 10 is configured to detect a state of the motherboard 100, and output a corresponding state signal to the power protection circuit 20 according to the state of the motherboard 100. The power supply module 30 is configured to supply power to the motherboard 100 when the motherboard 100 is in a working state. The power protection circuit 20 is configured to discharge the power supply module 30 when the motherboard 100 is in a non-operating state.
Referring to fig. 2, the power protection circuit 20 includes a control module 22 and a discharging module 24. The control module 22 is electrically connected to the discharge module 24. The control module 22 is electrically connected to the south bridge chip 10. The discharging module 24 is electrically connected to the power supply module 30.
The south bridge chip 10 outputs a status signal to the control module 22 according to the status of the motherboard 100. The control module 22 is configured to control the discharging module 24 to discharge the power supply module 30 according to the status signal.
For example, when the motherboard 100 is in an operating state (e.g., S0 state), the power supply module 30 supplies power to the motherboard 100, the south bridge chip 10 outputs a low-level status signal to the control module 22, and the control module 22 controls the discharging module 24 not to discharge the power supply module 30 according to the low-level status signal. When the motherboard 100 is in a non-operating state (e.g., S3 state, S4 state, or S5 state), the south bridge chip 10 outputs a high-level status signal to the control module 22, and the control module 22 controls the discharging module 24 to discharge the power supply module 30 according to the high-level status signal.
Referring to FIG. 3, in a preferred embodiment, the discharge module 24 may include eight resistors R1-R8. The resistor R1, the resistor R2, the resistor R3 and the resistor R4 are connected in parallel. The resistor R5 is connected in parallel with the resistor R6. The resistor R7 is connected in parallel with the resistor R8.
In a preferred embodiment, the control module 22 may include three electronic switches Q1-Q3 and two resistors R9-R10. A first terminal of the electronic switch Q1 is electrically connected with a first terminal of the electronic switch Q2 and a first terminal of the electronic switch Q3. The first terminal of the electronic switch Q1 is also electrically connected to the south bridge chip 10 through the resistor R9. The first terminal of the electronic switch Q1 is also connected to ground through the resistor R10. The second terminals of the electronic switch Q1, the electronic switch Q2 and the electronic switch Q3 are all grounded. The third terminal of the electronic switch Q1 is electrically connected with one terminal of the resistor R4. The third terminal of the electronic switch Q2 is electrically connected with one terminal of the resistor R6. The third terminal of the electronic switch Q3 is electrically connected with one terminal of the resistor R8.
In a preferred embodiment, the power supply module 30 may include three power sources V1-V3 and three capacitors C1-C3. The power supply V1 is grounded through a capacitor C1, and the power supply V1 is electrically connected with the other end of the resistor R4. The power supply V2 is grounded through a capacitor C2, and the power supply V2 is electrically connected with the other end of the resistor R6. The power supply V3 is grounded through a capacitor C3, and the power supply V3 is electrically connected with the other end of the resistor R8.
In a preferred embodiment, the electronic switches Q1-Q3 are all N-channel enhancement mode fets. The first terminal, the second terminal and the third terminal of the electronic switch Q1 correspond to the gate, the source and the drain of the N-channel enhancement mode fet, respectively. The first terminal, the second terminal and the third terminal of the electronic switch Q2 correspond to the gate, the source and the drain of the N-channel enhancement mode fet, respectively. The first terminal, the second terminal and the third terminal of the electronic switch Q3 correspond to the gate, the source and the drain of the N-channel enhancement mode fet, respectively.
In a preferred embodiment, the power supply V1 can output a voltage of 12 volts, the power supply V2 can output a voltage of 3.3 volts, and the power supply V3 can output a voltage of 5 volts.
In operation, when the motherboard 100 is in an operating state (e.g., S0 state), the capacitors C1-C3 respectively filter the power supplies V1-V3 to filter out noise in the corresponding power supplies, and the power supplies V1-V3 respectively charge the capacitors C1-C3. At this time, the south bridge chip 10 will send a low status signal to the first end of the electronic switches Q1-Q3, and the electronic switches Q1-Q3 will be turned off, so as to disconnect the resistors R1-R8 from the ground, and the discharging module 24 will not discharge the power supply module 30.
When the motherboard 100 is in a non-operating state (e.g., S3 state, S4 state, or S5 state), the south bridge chip 10 will send a high level status signal to the first end of the electronic switches Q1-Q3, the electronic switches Q1-Q3 will be turned on, so as to turn on the connection between the resistors R1-R8 and the ground, at this time, the power stored in the capacitor C1 will be discharged to the ground through the resistors R1-R4, the power stored in the capacitor C2 will be discharged to the ground through the resistors R5-R6, and the power stored in the capacitor C3 will be discharged to the ground through the resistors R7-R8.
The motherboard 100 detects the state of the motherboard 100 through the south bridge chip 10, and controls the discharging module 24 to discharge the power supply module 30 through the control module 22 when the motherboard 100 is in the non-operating state. Thus, the risk of burning out the electronic components of the motherboard 100 can be avoided.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited, although the present invention is described in detail with reference to the preferred embodiments.
It will be understood by those skilled in the art that various modifications and equivalent arrangements can be made without departing from the spirit and scope of the present invention.
Moreover, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort will fall within the protection scope of the present invention.
Claims (10)
1. A kind of power protection circuit, apply to the mother board, the said mother board includes south bridge chip and power supply module, the said south bridge chip is used for detecting the state of the said mother board, and output the corresponding status signal according to the state of the said mother board, the said power supply module is used for supplying power for the said mother board, characterized by, the said power protection circuit includes:
the control module is electrically connected to the south bridge chip to receive the state signal output by the south bridge chip; and
the discharging module is electrically connected between the control module and the power supply module;
when the mainboard is in a non-working state, the south bridge chip outputs a state signal of a first level to the control module, and the control module controls the discharging module to discharge the power supply module according to the state signal of the first level.
2. The power protection circuit of claim 1, wherein when the motherboard is in an operating state, the south bridge chip outputs a second level status signal to the control module, and the control module controls the discharging module not to discharge the power supply module according to the second level status signal.
3. The power protection circuit of claim 1, wherein the power supply module comprises a first power supply, a second power supply, a third power supply, a first capacitor, a second capacitor, and a third capacitor, the first power supply, the second power supply, and the third power supply are all configured to supply power to the motherboard, the first power supply is grounded through the first capacitor, the second power supply is grounded through the second capacitor, and the third power supply is grounded through the third capacitor.
4. The power protection circuit of claim 3, wherein the discharge module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor, the first resistor, the second resistor, the third resistor, and the fourth resistor are connected in parallel to discharge the first capacitor, the fifth resistor is connected in parallel with the sixth resistor to discharge the second capacitor, and the seventh resistor is connected in parallel with the eighth resistor to discharge the third capacitor.
5. The power protection circuit of claim 4, wherein the control module comprises a first electronic switch, a second electronic switch, a third electronic switch, and a first resistor, the first end of the first electronic switch is electrically connected with the first end of the second electronic switch and the first end of the third electronic switch, the first end of the first electronic switch is electrically connected with the south bridge chip through the first resistor, and is used for receiving the status signal outputted by the south bridge chip, the second ends of the first electronic switch, the second electronic switch and the third electronic switch are all grounded, the third terminal of the first electronic switch is electrically connected with one end of the fourth resistor, the third terminal of the second electronic switch is electrically connected with one end of the sixth resistor, and the third terminal of the third electronic switch is electrically connected with one end of the eighth resistor.
6. The power protection circuit of claim 5, wherein the control module further comprises a tenth resistor, the first terminal of the first electronic switch being coupled to ground through the tenth resistor.
7. The power protection circuit of claim 5, wherein the first electronic switch, the second electronic switch, and the third electronic switch are N-channel enhancement mode fets.
8. The power protection circuit of claim 7, wherein the first terminal, the second terminal and the third terminal of the first electronic switch correspond to a gate, a source and a drain of an N-channel enhancement mode fet, respectively, the first terminal, the second terminal and the third terminal of the second electronic switch correspond to a gate, a source and a drain of an N-channel enhancement mode fet, respectively, and the first terminal, the second terminal and the third terminal of the third electronic switch correspond to a gate, a source and a drain of an N-channel enhancement mode fet, respectively.
9. The power protection circuit of claim 3, wherein the first power supply is configured to output a voltage of 12 volts, the second power supply is configured to output a voltage of 3.3 volts, and the third power supply is configured to output a voltage of 5 volts.
10. A motherboard comprising a south bridge chip, a power supply module and the power protection circuit as claimed in any one of claims 1 to 9, wherein the power protection circuit is electrically connected between the south bridge chip and the power supply module, the south bridge chip is configured to detect a status of the motherboard, and the power protection circuit is configured to discharge the power supply module when the motherboard is in a non-operating status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910580487.8A CN112148101A (en) | 2019-06-28 | 2019-06-28 | Power supply protection circuit and mainboard applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910580487.8A CN112148101A (en) | 2019-06-28 | 2019-06-28 | Power supply protection circuit and mainboard applying same |
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| Publication Number | Publication Date |
|---|---|
| CN112148101A true CN112148101A (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910580487.8A Pending CN112148101A (en) | 2019-06-28 | 2019-06-28 | Power supply protection circuit and mainboard applying same |
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| CN (1) | CN112148101A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022188736A1 (en) * | 2021-03-12 | 2022-09-15 | 维沃移动通信有限公司 | Chip power supply circuit and method |
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| TW200602847A (en) * | 2004-07-09 | 2006-01-16 | Hon Hai Prec Ind Co Ltd | Switch control circuit for motherboard USB power |
| CN101349938A (en) * | 2008-08-15 | 2009-01-21 | 深圳市神舟电脑股份有限公司 | System for isolating notebook computer battery and mainboard power supply |
| CN102098463A (en) * | 2009-12-15 | 2011-06-15 | 康佳集团股份有限公司 | Low-power consumption television |
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| WO2022188736A1 (en) * | 2021-03-12 | 2022-09-15 | 维沃移动通信有限公司 | Chip power supply circuit and method |
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