CN204304532U - A kind of computer and the feed circuit based on its USB interface - Google Patents

Abstract

The utility model is suitable for the field of charging circuit design and provides a computer and a power supply circuit based on its USB interface. The circuit of the power supply circuit is built in the computer and connected to the computer USB interface. The circuit integrates the power supply signal and the level state of the setting signal through the OR gate to make the switching signal generation circuit drive the switching circuit to act, and it can be shut down and dormant in the computer. And in the sleep state, switch to the +5V signal voltage 5VSB of the ATX power supply of the computer to supply power to the USB interface. Since the +5V signal voltage 5VSB of the ATX power supply always exists and has nothing to do with the operating state of the computer, it ensures that the computer can still supply power to the battery of the handheld terminal connected to it through the USB interface when the computer is in shutdown, hibernation and sleep states. Since the computer USB interface is used to supply power to the battery, there is no need to use an existing charger or charging treasure, so it does not need to occupy space or a socket, and is not limited by the remaining power, so it can be used in a wide range of occasions.

Description

A computer and its power supply circuit based on its USB interface

technical field

The utility model belongs to the field of charging circuit design, in particular to a computer and a power supply circuit based on its USB interface.

Background technique

It is known that all kinds of battery-powered handheld terminals, such as mobile phones and tablet computers, have limited battery power, and when the power is insufficient, a charger or power bank is required to charge the battery.

However, there are certain disadvantages in charging with a charger or power bank, which are manifested in: 1. The charging head of the charger or power bank takes up a lot of space, especially when many batteries are charged together, it takes up a lot of space and takes up more sockets 2. Due to the limited power stored in the power bank, the application occasions are limited. For example, when the user goes out, the power bank may not be able to meet the charging requirements due to insufficient power.

Utility model content

The purpose of the utility model is to provide a power supply circuit based on a computer USB interface, aiming to solve the existing problem of large space occupation and limited application when using a charger or power bank to charge the battery of a handheld terminal.

The utility model is achieved in this way, a power supply circuit based on the computer USB interface, the power supply circuit is built in the computer, including:

An OR gate, the first input end of the OR gate is connected to the power signal, and the second input end of the OR gate is connected to the setting signal;

A switching signal generating circuit, the first input of the switching signal generating circuit is connected to the output of the OR gate, the second input of the switching signal generating circuit is connected to the +12V signal voltage of the ATX power supply, and the switching signal generating The circuit outputs a low level through the output terminal when the computer is turned off, dormant and sleeping;

A switching circuit, the first input end of the switching circuit is connected to the output end of the switching signal generation circuit, the second input end of the switching circuit is connected to the +5V signal voltage 5VSB of the ATX power supply, the first input end of the switching circuit The three input ends are connected to the voltage signal output by the ATX power supply, the output end of the switching circuit is connected to the power supply pin of the computer USB interface, and the switching circuit is switched to the ATX power supply according to the low level output by the switching signal generation circuit The +5V signal voltage supplies power to the power pin of the USB interface of the computer.

Wherein, the switching signal generation circuit may include: a first resistor R1, a second resistor R2, a third resistor R3, a first switch tube Q1, a second switch tube Q2, and a first capacitor C1; the first switch tube Q1 The high end of the first switching tube Q1 is connected to the +5V signal voltage of the ATX power supply through the first resistor R1, the low end of the first switching tube Q1 is grounded, and the driving end of the first switching tube Q1 is used as the switching signal generating circuit. The first input end, the high end of the second switching transistor Q2 is connected to the first end of the second resistor R2, the low end of the second switching transistor Q2 is grounded, and the driving end of the second switching transistor Q2 is connected to the The high end of the first switching transistor Q1, the third resistor R3 and the first capacitor C1 are respectively connected between the high end of the second switching transistor Q2 and ground, and the second end of the second resistor R2 serves as The second input end of the switching signal generating circuit, and the high end of the second switching transistor Q2 is used as the output end of the switching signal generating circuit.

At this time, the first switching tube Q1 and/or the second switching tube Q2 may be an N-type MOS tube, and the collector of the MOS tube serves as the first switching tube Q1 and/or the second switching tube Q1. The high end of the switch tube Q2, the source of the MOS tube is used as the low end of the first switch tube Q1 and/or the second switch tube Q2, and the gate of the MOS tube is used as the first switch tube Q1 And/or the drive end of the second switching tube Q2.

Wherein, the switching circuit may include: at least one third switching tube. When two or more third switching tubes are included, the two or more third switching tubes are connected in parallel with each other, and the third switching tubes The high end is used as the second input end of the switching circuit, the low end of the third switching tube is used as the output end of the switching circuit, and the driving end of the third switching tube is used as the first input end of the switching circuit; At least one fourth switch tube, when two or more fourth switch tubes are included, the two or more fourth switch tubes are connected in parallel, and the high end of the fourth switch tube is used as the third switch circuit of the switching circuit The input terminal, the low end of the fourth switching tube is used as the output terminal of the switching circuit, and the driving terminal of the fourth switching tube is used as the first input terminal of the switching circuit.

At this time, the third switch tube may be a P-type MOS tube, the collector of the MOS tube is used as the low end of the third switch tube, and the source of the MOS tube is used as the The high end, the gate of the MOS transistor serves as the driving end of the third switch transistor.

At this time, the fourth switch tube can be an N-type MOS tube, the collector of the MOS tube is used as the high end of the fourth switch tube, and the source of the MOS tube is used as the low end of the fourth switch tube. end, the gate of the MOS transistor serves as the drive end of the fourth switch transistor.

At this time, the switching circuit may include two third switch transistors and three fourth switch transistors.

Further, the power supply circuit may further include: an output filter circuit connected between the output terminal of the switching circuit and ground.

Wherein, the output filtering circuit may include: a second capacitor C2 and a third capacitor C3 respectively connected between the output terminal of the switching circuit and the ground.

Another object of the present utility model is to provide a computer, including a USB interface, the computer also includes a power supply circuit based on the computer USB interface connected to the USB interface, and the power supply circuit based on the computer USB interface is as described above The power supply circuit based on the computer USB interface.

The circuit of the power supply circuit based on the computer USB interface proposed by the utility model is built in the computer and connected with the computer USB interface. The circuit is driven by the level state of the integrated power signal ATXPOWER_OK_BMC and the setting signal 5VDUAL_SW by OR gate. The switching circuit operates, and can switch to the +5V signal voltage 5VSB of the computer ATX power supply to supply power to the USB interface when the computer is turned off, dormant and sleepy. Since the +5V signal voltage 5VSB of the ATX power supply always exists and has nothing to do with the operating state of the computer, it ensures that the computer can still supply power to the battery of the handheld terminal connected to it through the USB interface when the computer is in shutdown, hibernation and sleep states. Since the computer USB interface is used to supply power to the battery, there is no need to use an existing charger or charging treasure, so it does not need to occupy space or a socket, and is not limited by the remaining power, so it can be used in a wide range of occasions.

Description of drawings

Fig. 1 is the circuit principle diagram of the power supply circuit based on the computer USB interface that the utility model embodiment provides;

FIG. 2 is a circuit diagram of FIG. 1 .

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Aiming at the problems existing in the prior art, the utility model provides a circuit of a power supply circuit based on a computer USB interface, the circuit is built in the computer and connected to the computer USB interface, and the circuit is composed of an OR gate integrated power supply signal ATXPOWER_OK_BMC and a setting signal The level state of 5VDUAL_SW enables the switching signal generation circuit to drive the switching circuit to act, and can switch to the +5V signal voltage 5VSB of the computer ATX power supply to supply power to the USB interface when the computer is turned off, dormant and sleeping.

Fig. 1 shows the circuit principle of the power supply circuit based on the computer USB interface provided by the embodiment of the present invention. For the convenience of description, only the parts related to the present invention are shown.

The power supply circuit based on the computer USB interface provided by the embodiment of the utility model is built in the computer, including: OR gate U1, the first input end of the OR gate U1 is connected to the power supply signal ATXPOWER_OK_BMC, and the second input end of the OR gate U1 is connected to the setting signal 5VDUAL_SW Switching signal generating circuit 11, the first input end of switching signal generating circuit 11 is connected to the output end of OR gate U1, the second input end of switching signal generating circuit 11 is connected to +12V signal voltage ATX12V of ATX power supply, switching signal generating circuit 11 When the computer is turned off, dormant and sleeping, the output terminal outputs a low level, and when the computer is turned on, the +12V signal voltage ATX12V of the ATX power supply is output through the output terminal; the switch circuit 12, the first input terminal of the switch circuit 12 is connected to switch The output terminal of the signal generation circuit 11, the second input terminal of the switching circuit 12 is connected to the +5V signal voltage 5VSB of the ATX power supply, the third input terminal of the switching circuit 12 is connected to the voltage signal VDD5 output by the ATX power supply, and the output terminal of the switching circuit 12 Connect the power supply pin of the USB interface of the computer, and the switching circuit 12 switches to the +5V signal voltage 5VSB of the ATX power supply according to the low level output by the switching signal generating circuit 11 to supply power to the power supply pin of the USB interface, and according to the switching signal generating circuit 11 The +12V signal voltage ATX12V of the output ATX power supply is switched to the voltage signal VDD5 to supply power to the power supply pin of the USB interface.

Among them, the computer power-off state is the state S5 in which all devices in the computer are completely closed, the computer sleep state is the computer suspend to hard disk (Suspend To Disk, STD) state S4, and the computer sleep state is the computer suspend to memory (Suspend To RAM, STR) ) state S3, the power-on state of the computer is the normal working state S0 of the computer.

Wherein, the power signal ATXPOWER_OK_BMC is a computer power-on signal. The voltage signal VDD5 is a voltage signal directly output by the ATX power supply. The setting signal 5VDUAL_SW is connected to the GPIO interface of the south bridge chip on the computer motherboard, and the setting signal 5VDUAL_SW is controlled by the GPIO interface to be high or low, and the GPIO interface is powered by the Standby (standby) power supply. The +12V signal voltage ATX12V of the ATX power supply only exists in the S0 state of the computer. The +5V signal voltage 5VSB of the ATX power supply is the standby (Stand-by) voltage of the computer, that is to say, it exists as long as the ATX power supply of the computer is plugged into the power cord, regardless of whether the computer is on or off.

In addition, in order to realize the output filtering function, the power supply circuit based on the computer USB interface further includes: an output filtering circuit 13 connected between the output terminal of the switching circuit 12 and the ground.

Further, as shown in FIG. 2 , the switching signal generating circuit 11 may include: a first resistor R1 , a second resistor R2 , a third resistor R3 , a first switch Q1 , a second switch Q2 , and a first capacitor C1 . Wherein, the high end of the first switching tube Q1 is connected to the +5V signal voltage 5VSB of the ATX power supply through the first resistor R1, the low end of the first switching tube Q1 is grounded, and the driving end of the first switching tube Q1 is used as the first switching signal generating circuit 11. One input end is connected to the output end of the OR gate U1; the high end of the second switching tube Q2 is connected to the first end of the second resistor R2, the low end of the second switching tube Q2 is grounded, and the driving end of the second switching tube Q2 is connected to the first The high end of the switch tube Q1; the third resistor R3 and the first capacitor C1 are respectively connected between the high end of the second switch tube Q2 and the ground; the second end of the second resistor R2 is used as the second input end of the switching signal generating circuit 11 The +12V signal voltage ATX12V of the ATX power supply is connected, and the high end of the second switching transistor Q2 is connected to the first input terminal of the switching circuit 12 as the output terminal of the switching signal generating circuit 11 .

Preferably, the first switching tube Q1 and/or the second switching tube Q2 are N-type MOS tubes, the collector of the MOS tube is used as the high end of the first switching tube Q1 and/or the second switching tube Q2, and the source of the MOS tube is As the low end of the first switching transistor Q1 and/or the second switching transistor Q2, the gate of the MOS transistor serves as the driving end of the first switching transistor Q1 and/or the second switching transistor Q2.

Further, as shown in FIG. 2, the switch circuit 12 may include: at least one third switch tube Q41 to Q4n, and when two or more third switch tubes are included, the two or more third switch tubes are connected in parallel , that is, the driving ends of the two or more third switching tubes are connected to each other, the high ends are connected to each other, and the low ends are connected to each other, and the high end of the third switching tube is used as the second input terminal of the switching circuit 12 to connect to the +5V signal of the ATX power supply Voltage 5VSB, the low end of the third switching tube is used as the output end of the switching circuit 12 and connected to the power supply pin of the computer USB interface, and the driving end of the third switching tube is connected to the switching signal generating circuit 11 as the first input end of the switching circuit 12 at least one fourth switch tube Q31 to Q3n, when two or more fourth switch tubes are included, the two or more fourth switch tubes are connected in parallel with each other, that is, the two or more fourth switch tubes The driving ends of the tubes are connected to each other, the high ends are connected to each other, and the low ends are connected to each other. The high end of the fourth switching tube is used as the third input terminal of the switching circuit 12 and connected to the voltage signal VDD5, and the low end of the fourth switching tube is used as the output of the switching circuit 12. The terminal is connected to the power supply pin of the USB interface of the computer, and the driving terminal of the fourth switching tube is used as the first input terminal of the switching circuit 12 and connected to the output terminal of the switching signal generating circuit 11.

Preferably, the third switch tube is a P-type MOS tube, the collector of the MOS tube is used as the low end of the third switch tube, the source of the MOS tube is used as the high end of the third switch tube, and the gate of the MOS tube is used as the third switch tube. the drive end of the tube.

Preferably, the fourth switch tube is an N-type MOS tube, the collector of the MOS tube is used as the high end of the fourth switch tube, the source of the MOS tube is used as the low end of the fourth switch tube, and the gate of the MOS tube is used as the fourth switch tube. the drive end of the tube.

Preferably, the switch circuit 12 includes two third switch transistors and three fourth switch transistors. The purpose of setting multiple third switch tubes and/or fourth switch tubes is to ensure that sufficient current can be provided in the case of a large load.

Further, as shown in FIG. 2 , the output filter circuit 13 may include: a second capacitor C2 and a third capacitor C3 respectively connected between the output terminal of the switching circuit 12 and the ground.

The working principle of the circuit shown in Figure 2 is explained in detail below:

First of all, in the power-on state, the user can select on the setting interface whether the USB interface connected to the power supply circuit based on the computer USB interface provides a power supply switch. , pull the setting signal 5VDUAL_SW low; otherwise, select off, and then pull the setting signal 5VDUAL_SW high when the computer switches to shutdown, hibernation and sleep states.

Afterwards, if the computer is turned on and enters the S0 state, any one of the power supply signal ATXPOWER_OK_BMC and the setting signal 5VDUAL_SW is at a high level, and the output is at a high level after passing through the OR gate U1, and the high level makes the first switch tube Q1 turn on, thereby The driving end of the second switching tube Q2 is pulled down, the second switching tube Q2 is turned off, and the switching signal generating circuit 11 outputs the +12V signal voltage ATX12V of the ATX power supply to the switching circuit 12 . The +12V signal voltage ATX12V makes the third switching tube cut off and the fourth switching tube is turned on. At this time, the voltage provided by the output terminal of the switching circuit 12 to the computer USB interface comes from the voltage signal VDD5. Therefore, the USB interface has power and can be used. Supply power to the battery of the handheld terminal connected to it.

If the computer enters the S5, S4 or S3 state, and the USB interface connected to the power supply circuit based on the USB interface of the computer is selected on the setting interface to provide power, the power signal ATXPOWER_OK_BMC is low level, and the setting signal 5VDUAL_SW is low level. After passing through the OR gate U1, the output is low level, which makes the first switching tube Q1 cut off, and the driving terminal voltage of the second switching tube Q2 is determined by the +5V signal voltage 5VSB of the ATX power supply, so that the second switching tube Q2 conducts On, the switching signal generating circuit 11 outputs a low level to the switching circuit 12 . This low level makes the third switching tube conduction and the fourth switching tube is off. At this time, the voltage provided by the output terminal of the switching circuit 12 to the computer USB interface comes from the +5V signal voltage 5VSB of the ATX power supply. The 5V signal voltage 5VSB always exists regardless of the current state of the computer, so the USB interface has power and can supply power to the battery of the handheld terminal connected to it.

If the computer enters the S5, S4 or S3 state, and the USB interface connected to the power supply circuit based on the computer USB interface is selected not to provide power supply on the setting interface, the power signal ATXPOWER_OK_BMC is low level, and the setting signal 5VDUAL_SW is high level . After passing through the OR gate U1, the output is a high level, which makes the first switching tube Q1 turn on, thereby pulling down the driving end of the second switching tube Q2, and the second switching tube Q2 is turned off, switching the signal generating circuit 11 to The switching circuit 12 outputs the +12V signal voltage ATX12V of the ATX power supply. The +12V signal voltage ATX12V makes the third switching tube cut off and the fourth switching tube is turned on. At this time, the voltage provided by the output terminal of the switching circuit 12 to the computer USB interface comes from the voltage signal VDD5, and because the voltage signal VDD5 is Zero, therefore, the USB interface has no electricity and cannot supply power to the battery of the handheld terminal connected to it.

The embodiment of the utility model also provides a computer, which includes a USB interface, and also includes a power supply circuit based on the computer USB interface connected to the USB interface. The power supply circuit based on the computer USB interface is as described above and will not be described in detail.

In summary, the circuit of the power supply circuit based on the computer USB interface proposed by the utility model is built in the computer and connected to the computer USB interface. The switching signal generation circuit drives the switching circuit to act, and can switch to the +5V signal voltage 5VSB of the ATX power supply of the computer to supply power to the USB interface when the computer is in shutdown, sleep and sleep states. Since the +5V signal voltage 5VSB of the ATX power supply always exists and has nothing to do with the operating state of the computer, it ensures that the computer can still supply power to the battery of the handheld terminal connected to it through the USB interface when the computer is in shutdown, hibernation and sleep states. Since the computer USB interface is used to supply power to the battery, there is no need to use an existing charger or charging treasure, so it does not need to occupy space or a socket, and is not limited by the remaining power, so it can be used in a wide range of occasions.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A kind of power supply circuit based on computer USB interface, it is characterized in that, described power supply circuit is built in the computer, comprises: An OR gate, the first input end of the OR gate is connected to the power signal, and the second input end of the OR gate is connected to the setting signal; A switching signal generating circuit, the first input of the switching signal generating circuit is connected to the output of the OR gate, the second input of the switching signal generating circuit is connected to the +12V signal voltage of the ATX power supply, and the switching signal generating The circuit outputs a low level through the output terminal when the computer is turned off, dormant and sleeping; A switching circuit, the first input end of the switching circuit is connected to the output end of the switching signal generation circuit, the second input end of the switching circuit is connected to the +5V signal voltage 5VSB of the ATX power supply, the first input end of the switching circuit The three input ends are connected to the voltage signal output by the ATX power supply, the output end of the switching circuit is connected to the power supply pin of the computer USB interface, and the switching circuit is switched to the ATX power supply according to the low level output by the switching signal generation circuit The +5V signal voltage supplies power to the power pin of the USB interface of the computer. 2. The power supply circuit based on the computer USB interface as claimed in claim 1, wherein the switching signal generating circuit comprises: a first resistor R1, a second resistor R2, a third resistor R3, a first switch tube Q1, the second switching tube Q2, the first capacitor C1; The high end of the first switching tube Q1 is connected to the +5V signal voltage of the ATX power supply through the first resistor R1, the low end of the first switching tube Q1 is grounded, and the driving end of the first switching tube Q1 serves as The first input end of the switching signal generating circuit, the high end of the second switch tube Q2 is connected to the first end of the second resistor R2, the low end of the second switch tube Q2 is grounded, and the second switch tube Q2 The driving end of the transistor Q2 is connected to the high end of the first switching transistor Q1, the third resistor R3 and the first capacitor C1 are respectively connected between the high end of the second switching transistor Q2 and ground, and the second The second end of the resistor R2 is used as the second input end of the switching signal generating circuit, and the high end of the second switching transistor Q2 is used as the output end of the switching signal generating circuit. 3. The power supply circuit based on the computer USB interface as claimed in claim 2, wherein the first switch tube Q1 and/or the second switch tube Q2 are N-type MOS tubes, and the MOS tubes The collector is used as the high end of the first switching tube Q1 and/or the second switching tube Q2, and the source of the MOS tube is used as the low side of the first switching tube Q1 and/or the second switching tube Q2. end, the gate of the MOS transistor is used as the driving end of the first switching transistor Q1 and/or the second switching transistor Q2. 4. The power supply circuit based on the computer USB interface as claimed in claim 1, wherein the switching circuit comprises: At least one third switch tube, when two or more third switch tubes are included, the two or more third switch tubes are connected in parallel, and the high end of the third switch tube is used as the second switch circuit of the switching circuit The input terminal, the low end of the third switching tube is used as the output terminal of the switching circuit, and the driving terminal of the third switching tube is used as the first input terminal of the switching circuit; At least one fourth switch tube, when two or more fourth switch tubes are included, the two or more fourth switch tubes are connected in parallel, and the high end of the fourth switch tube is used as the third switch circuit of the switching circuit The input terminal, the low end of the fourth switching tube is used as the output terminal of the switching circuit, and the driving terminal of the fourth switching tube is used as the first input terminal of the switching circuit. 5. The power supply circuit based on the computer USB interface as claimed in claim 4, wherein the third switch tube is a P-type MOS tube, and the collector of the MOS tube is used as the low voltage of the third switch tube. end, the source of the MOS transistor serves as the high end of the third switch transistor, and the gate of the MOS transistor serves as the drive end of the third switch transistor. 6. The power supply circuit based on the computer USB interface as claimed in claim 4, wherein the fourth switch tube is an N-type MOS tube, and the collector of the MOS tube is used as the high end of the fourth switch tube , the source of the MOS transistor is used as the low end of the fourth switch transistor, and the gate of the MOS transistor is used as the driving end of the fourth switch transistor. 7. The power supply circuit based on the computer USB interface according to claim 4, wherein the switching circuit comprises two third switch tubes and three fourth switch tubes. 8. The power supply circuit based on the computer USB interface as claimed in claim 1, wherein the power supply circuit further comprises: An output filter circuit connected between the output terminal of the switching circuit and ground. 9. The power supply circuit based on the computer USB interface as claimed in claim 8, wherein the output filter circuit comprises: The second capacitor C2 and the third capacitor C3 are respectively connected between the output terminal of the switching circuit and the ground. 10. A computer, comprising a USB interface, characterized in that the computer also includes a power supply circuit based on the computer USB interface connected to the USB interface, and the power supply circuit based on the computer USB interface is as claimed in claims 1 to 9 The power supply circuit based on the computer USB interface described in any one.