CN211349292U - Power supply circuit of electronic equipment and electronic equipment - Google Patents
Power supply circuit of electronic equipment and electronic equipment Download PDFInfo
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- CN211349292U CN211349292U CN201922412150.4U CN201922412150U CN211349292U CN 211349292 U CN211349292 U CN 211349292U CN 201922412150 U CN201922412150 U CN 201922412150U CN 211349292 U CN211349292 U CN 211349292U
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Abstract
The utility model provides a power supply circuit of electronic equipment, which comprises a voltage conversion chip, a first diode, a second diode, a third diode, a fourth diode, a first resistor and a second resistor; the voltage conversion chip comprises a power supply pin, an enabling pin and a voltage output pin, wherein the voltage output pin is used for being connected with a PD control module to be powered. The utility model also provides an electronic equipment. The utility model provides an electronic equipment's supply circuit and electronic equipment can save a voltage conversion chip and select the switching circuit, and supply circuit's simple structure just practices thrift the cost.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a technical field of the power supply of electronic equipment especially relates to a power supply circuit and electronic equipment of electronic equipment.
[ background of the invention ]
At present, the Type-C interface tends to be unified, the protocol of the Type-C interface is bidirectional power supply, in an electronic Device (such as a notebook computer) of which the Type-C interface supports the PD power supply protocol, when the Type-C interface is connected with a power Adapter (AC Adapter), the notebook computer is used as a Device, and the power Adapter supplies power to the notebook computer through the interface, which is in a Sink mode; when the Type-C interface is connected with the device (such as a HUB/U disk and the like), the notebook computer is used as a Host to supply power to the external device through the interface, and the mode is a Source mode; generally, a bidirectional power supply Control module (PD Control) is disposed in an electronic device to Control the selection of the power supply path Sink/Source, and in the circuit design for PD Control power supply, a group of selection switching lines is required to select the power supply path Sink/Source, and each of the two power supply paths needs to be separately provided with a voltage conversion chip, so that the structure of the power supply circuit is complex and the cost is high.
In view of the above, it is desirable to provide a power supply circuit for an electronic device and an electronic device to overcome the above-mentioned drawbacks.
[ Utility model ] content
The utility model aims at providing a can save a voltage conversion chip and select switching circuit, supply circuit's simple structure and the electronic equipment's of saving cost supply circuit and electronic equipment.
In order to achieve the above object, the present invention provides a power supply circuit for an electronic device, including a voltage conversion chip, a first diode, a second diode, a third diode, a fourth diode, a first resistor and a second resistor; the voltage conversion chip comprises a power supply pin, an enabling pin and a voltage output pin, and the voltage output pin is used for connecting a PD control module to be powered; the anode of the first diode is used for being connected with the anode of a power adapter of electronic equipment, the cathode of the first diode is connected with the power pin, the anode of the second diode is used for being connected with the anode of the power adapter, and the cathode of the second diode is connected with the enable pin; the anode of the third diode is used for being connected with the anode of a battery of the electronic device, the cathode of the third diode is connected with the power pin, the first end of the first resistor is connected with the cathode of the third diode, the second end of the first resistor is connected with the anode of the fourth diode, the cathode of the fourth diode is connected with the enable pin, the first end of the second resistor is connected with the anode of the fourth diode, and the second end of the second resistor is grounded.
In a preferred embodiment, the battery power supply control module comprises a power supply terminal and a control terminal, the power supply terminal is used for being connected with the anode of the battery, and the control terminal is connected with the anode of the fourth diode; the battery power supply control module is used for closing the voltage conversion chip to prohibit the voltage output pin from outputting voltage when the electronic equipment is not accessed to the power adapter and is accessed to the battery and the electronic equipment is in a shutdown state.
In a preferred embodiment, the battery power supply control module comprises a control unit, a first MOS transistor, a second MOS transistor, a third resistor and a fourth resistor; the control unit is used for outputting a low level signal when the electronic equipment is not connected with the power adapter and is connected with the battery and the electronic equipment is in a power-off state, the control unit is connected with a G pole of the first MOS tube, an S pole of the first MOS tube is grounded, a D pole of the first MOS tube is connected with a G pole of the second MOS tube, an S pole of the second MOS tube is grounded, and the D pole of the second MOS tube is the control leading-out end; the first end of the third resistor is the power supply leading-out end, the second end of the third resistor is connected with the G pole of the second MOS tube, the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is grounded.
In a preferred embodiment, the device further comprises a key switch, a fifth diode and a sixth diode; one end of the key switch is grounded, the other end of the key switch is connected with the cathode of the fifth diode, the anode of the fifth diode is connected with the control unit, the cathode of the sixth diode is connected with the cathode of the fifth diode, and the anode of the sixth diode is connected with the G pole of the second MOS tube.
In a preferred embodiment, a fifth resistor and a first capacitor are further connected to the enable pin.
In a preferred embodiment, the power supply pin is further connected with a second capacitor, and the voltage output pin is further connected with a third capacitor.
In a preferred embodiment, the voltage conversion chip is a BUCK or LDO that converts a high voltage to a low voltage.
In a preferred embodiment, the control unit is an MCU.
In a preferred embodiment, a ratio of magnitudes of the first resistor and the second resistor is 2:1, and a ratio of magnitudes of the third resistor and the fourth resistor is 2: 1.
The utility model also provides an electronic equipment, including above-mentioned arbitrary one electronic equipment's supply circuit.
Compared with the prior art, the power supply circuit of the electronic equipment and the electronic equipment provided by the utility model are optimized on the line, one voltage conversion chip and a selection switching line are saved, the structure of the power supply circuit is simple, the layout of the circuit board is reduced, the space of the circuit board is saved, and the cost is saved; in addition, the battery power supply can be further turned off in the battery-only mode and the shutdown scene, so that the power consumption is saved, and the utilization rate of the battery is improved.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic block diagram of a power supply circuit of an electronic device according to the present invention;
fig. 2 is a circuit diagram of a power supply circuit of an electronic device according to the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and fig. 2, the power supply circuit 100 of the electronic device of the present invention includes a voltage conversion chip U1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first resistor R1, and a second resistor R2.
The voltage conversion chip U1 comprises a power supply pin VCC, an enable pin EN and a voltage output pin VOUT, wherein the voltage output pin VOUT is used for connecting a PD control module to be powered; the anode of the first diode D1 is used for connecting the anode of a power adapter Vac of the electronic device, the cathode of the first diode D1 is connected to a power pin VCC, the anode of the second diode D2 is used for connecting the anode of the power adapter Vac, and the cathode of the second diode D2 is connected to an enable pin EN; the anode of the third diode D3 is used for being connected to the anode of the battery Vdc of the electronic device, the cathode of the third diode D3 is connected to the power supply pin VCC, the first end of the first resistor R1 is connected to the cathode of the third diode D3, the second end of the first resistor R1 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the enable pin EN, the first end of the second resistor R2 is connected to the anode of the fourth diode D4, and the second end of the second resistor R2 is grounded.
The utility model provides a power supply circuit 100 of electronic equipment, during the application, including following three kinds of circumstances:
(1) when the electronic device is connected to the power adapter Vac but not connected to the battery Vdc, the power adapter Vac supplies power to the voltage conversion chip U1 through the first diode D1, and turns on the enable terminal EN of the voltage conversion chip U1 through the second diode D2, so that the voltage conversion chip U1 operates to output voltage to the PD control module to be powered, and the PD control module is powered by the power adapter Vac. At this time, the third diode D3 and the fourth diode D4 perform an isolation function, thereby preventing the power adapter Vac from leaking to the battery Vdc.
(2) When the electronic device is connected to the battery Vdc but not connected to the power adapter Vac, the battery Vdc supplies power to the voltage conversion chip U1 through the third diode D3, and turns on the enable terminal EN of the voltage conversion chip U1 through the fourth diode D4, so that the voltage conversion chip U1 works to output voltage to the PD control module to be powered, and the battery Vdc supplies power to the PD control module. At this time, the first diode D1 and the second diode D2 play a role of isolation, so as to prevent the battery Vdc from leaking to the power adapter Vac.
(3) When the electronic device is connected to both the battery Vdc and the power adapter Vac, if the voltage of the power adapter Vac is greater than the voltage of the battery Vdc, the first diode D1 and the second diode D2 are turned on, the third diode D3 and the fourth diode D4 are turned off, and at this time, the PD control module is powered by the power adapter Vac with a higher voltage, and the third diode D3 and the fourth diode D4 prevent the power adapter Vac from leaking electricity to the battery Vdc; if the voltage of the power adapter Vac is less than the voltage of the battery Vdc, the first diode D1 and the second diode D2 are cut off, the third diode D3 and the fourth diode D4 are turned on, at this time, the battery Vdc with a larger voltage supplies power to the PD control module, and the first diode D1 and the second diode D2 prevent the battery Vdc from leaking to the power adapter Vac; that is, when the electronic device is connected to the power adapter Vac and the battery Vdc at the same time, the PD control module is powered by the voltage conversion chip U1 with higher voltage. It can be understood that when the voltages of the power adapter Vac and the battery Vdc that are simultaneously connected are the same, both can simultaneously supply power to the PD control module.
Therefore, the utility model provides a power supply circuit 100 of electronic equipment optimizes on the circuit, saves a voltage conversion chip and selects the switching circuitry, and power supply circuit's simple structure has reduced the circuit board overall arrangement, practices thrift the circuit board space and practices thrift the cost. It can be understood that the voltage conversion chip U1 is a BUCK converter or LDO (low dropout regulator) for converting a high voltage into a low voltage to output an operating voltage required by the PD control module, and generally, the voltage range of the power adapter Vac is 5-20V, while the voltage of the battery Vdc varies according to the number of series connections, and the voltage range of the currently commonly used electronic device is 4.2-13.6V.
Further, the power supply circuit 100 further includes a battery power supply control module 10, the battery power supply control module 10 includes a power supply terminal 11 and a control terminal 12, the power supply terminal 11 is used for connecting to the positive electrode of the battery Vdc, and the control terminal 12 is connected to the anode of the fourth diode D4; the battery power supply control module 10 is used for turning off the voltage conversion chip U1 to disable the voltage output pin Vout from outputting the voltage when the electronic device is not connected to the power adapter Vac but connected to the battery Vdc and the electronic device is in the power-off state. Namely, the battery power supply control module 10 further turns off the battery power supply in the battery-only mode and in the shutdown scene, thereby saving power consumption and improving the utilization rate of the battery.
Specifically, the battery power supply control module 10 includes a control unit U2, a first MOS transistor Q1, a second MOS transistor Q2, a third resistor R3, and a fourth resistor R4; the control unit U2 is configured to output a low level signal when the electronic device is not connected to the power adapter Vac and is connected to the battery Vdc and the electronic device is in a power-off state, the control unit U2 is connected to the G pole of the first MOS transistor Q1, the S pole of the first MOS transistor is grounded, the D pole of the first MOS transistor Q1 is connected to the G pole of the second MOS transistor Q2, the S pole of the second MOS transistor Q2 is grounded, and the D pole of the second MOS transistor Q2 is connected to the control lead-out terminal 12; the first end of the third resistor R3 is a power supply terminal 11, the second end of the third resistor R3 is connected to the G-pole of the second MOS transistor Q2, the first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is grounded.
When the electronic device is not connected with the power adapter Vac and is connected with the battery Vdc and the electronic device is in a shutdown state, the control unit U2 outputs a low level signal, the first MOS transistor Q1 is turned off, the battery Vdc pulls the G pole of the second MOS transistor Q2 to a high level through the third resistor R3, the second MOS transistor Q2 is turned on, the voltage conversion chip U1 is not powered on and does not work, the voltage output pin Vout does not output voltage, and the purpose of saving power consumption is achieved. Specifically, the control Unit U2 is an MCU (micro controller Unit).
Further, the power supply circuit 100 further includes a key switch K1, a fifth diode D5, and a sixth diode D6; one end of the key switch K1 is grounded, the other end of the key switch K1 is connected to the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected to the control unit U2, the cathode of the sixth diode D6 is connected to the cathode of the fifth diode D5, and the anode of the sixth diode D6 is connected to the G-pole of the second MOS transistor Q2.
When the electronic device is not connected with the power adapter Vac and is connected with the battery Vdc and the electronic device is in a shutdown state, the voltage conversion chip U1 is not powered on and does not work, but when the key switch K1 is pressed, that is, the key switch K1 is closed, on one hand, the G pole of the second MOS transistor Q2 is pulled to the ground through the sixth diode D6, the second MOS transistor Q2 is cut off, and at this time, after the voltage Vdc of the battery Vdc is divided into the fourth diode D4 through the third diode D3, the first resistor R1 and the second resistor R2, the enable pin EN of the voltage conversion chip U1 is enabled, so that the voltage conversion chip U1 starts to work; on the other hand, the fifth diode D5 wakes up the control unit U2 to start working and outputs a high level, the first MOS transistor Q1 is turned on, the G pole of the second MOS transistor Q2 is grounded to a low level after the first MOS transistor Q1 is turned on, and the second MOS transistor Q2 is also in a cut-off state, so that even if the key switch K1 is released, that is, after the key switch K1 is turned off, the G pole of the second MOS transistor Q2 is always kept at the low level and kept in the cut-off state, the voltage conversion chip U1 continues working, and the voltage conversion chip U1 is woken up to work by closing the key switch K1, so as to provide a working voltage for the PD control module, and further facilitate the operation of a user.
In this embodiment, the enable pin EN is further connected to a fifth resistor R5 and a first capacitor C1, and the fifth resistor R5 and the first capacitor C1 function to smooth the start of the enable pin EN, and at the same time, to ensure timely discharge when the enable pin EN is turned off, and to quickly turn off the voltage output pin Vout to prohibit the output voltage. The power supply pin VCC is further connected with a second capacitor C2, the voltage output pin Vout is further connected with a third capacitor C3, and the second capacitor C2 and the third capacitor C3 are used for filtering noise of the circuit, so as to stabilize the voltage of the power supply pin VCC and the voltage output pin Vout. The size of the first capacitor C1 is 0-0.1uF, the size of the second capacitor C2 and the size of the third capacitor C3 are 1-10uF, and the withstand voltage of the first capacitor C1 and the withstand voltage of the second capacitor C2 are higher than 120% of the maximum value of the battery Vdc/the power adapter Vac so as to ensure the margin; the withstand voltage of the third capacitor C3 is higher than 120% of the voltage output pin Vout to ensure a margin.
The ratio of the sizes of the first resistor R1 and the second resistor R2 is 2:1, the ratio of the sizes of the third resistor R3 and the fourth resistor R4 is 2:1, specifically, the sizes of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are 10k-100k Ω, and the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are used for voltage division.
It is understood that the reverse withstand voltage of the first diode D1, the second diode D2, the third diode D3, the fourth diode D4 and the fifth diode D5 should be higher than 120% of the maximum value of the voltage source connected to the anode terminal thereof to ensure a margin, the forward conduction current Ir should be as small as possible, and the forward conduction voltage drop should be preferably small. The forward conduction current Ir of the first diode D1 and the third diode D3 is required to satisfy 150% higher than Io (the maximum operating current of the PD control module) to ensure a margin. The VDS of the first MOS switch Q1 and the second MOS transistor Q2 is required to be higher than 120% of the maximum voltage of the battery Vdc to ensure a margin, and the VGS is also selected to be higher than the application value thereof, and can be adjusted by dividing the voltage by resistors (the third resistor R3 and the fourth resistor R4) to meet the VGS requirement. The withstand voltage of the power supply pin VCC and the enable pin EN of the voltage conversion chip U1 is higher than 120% of the maximum value of the battery Vdc/the power adapter Vac, so as to ensure a margin.
The utility model also provides an electronic equipment, including the power supply circuit 100 of the electronic equipment of any one of the above-mentioned embodiments. It is understood that the electronic device may be a notebook computer, a tablet computer, etc. having a Type-C interface required for bidirectional power supply (Sink/Source). It should be noted that all embodiments of the power supply circuit 100 of the electronic device provided by the present invention are applicable to the electronic device provided by the present invention, and all the embodiments can achieve the same or similar beneficial effects.
To sum up, the power supply circuit 100 of the electronic device and the electronic device provided by the present invention are optimized on the line, save one voltage conversion chip and select the switching line, the structure of the power supply circuit is simple, the layout of the circuit board is reduced, the space of the circuit board is saved, and the cost is saved; in addition, the battery power supply can be further turned off in the battery-only mode and the shutdown scene, so that the power consumption is saved, and the utilization rate of the battery is improved.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A power supply circuit of electronic equipment is characterized by comprising a voltage conversion chip, a first diode, a second diode, a third diode, a fourth diode, a first resistor and a second resistor; the voltage conversion chip comprises a power supply pin, an enabling pin and a voltage output pin, and the voltage output pin is used for connecting a PD control module to be powered;
the anode of the first diode is used for being connected with the anode of a power adapter of electronic equipment, the cathode of the first diode is connected with the power pin, the anode of the second diode is used for being connected with the anode of the power adapter, and the cathode of the second diode is connected with the enable pin;
the anode of the third diode is used for being connected with the anode of a battery of the electronic device, the cathode of the third diode is connected with the power pin, the first end of the first resistor is connected with the cathode of the third diode, the second end of the first resistor is connected with the anode of the fourth diode, the cathode of the fourth diode is connected with the enable pin, the first end of the second resistor is connected with the anode of the fourth diode, and the second end of the second resistor is grounded.
2. The power supply circuit of the electronic device according to claim 1, further comprising a battery power control module, wherein the battery power control module comprises a power terminal and a control terminal, the power terminal is used for connecting with the positive electrode of the battery, and the control terminal is connected with the anode of the fourth diode; the battery power supply control module is used for closing the voltage conversion chip to prohibit the voltage output pin from outputting voltage when the electronic equipment is not accessed to the power adapter and is accessed to the battery and the electronic equipment is in a shutdown state.
3. The power supply circuit of the electronic device according to claim 2, wherein the battery power supply control module comprises a control unit, a first MOS transistor, a second MOS transistor, a third resistor, and a fourth resistor; the control unit is used for outputting a low level signal when the electronic equipment is not connected with the power adapter and is connected with the battery and the electronic equipment is in a power-off state, the control unit is connected with a G pole of the first MOS tube, an S pole of the first MOS tube is grounded, a D pole of the first MOS tube is connected with a G pole of the second MOS tube, an S pole of the second MOS tube is grounded, and the D pole of the second MOS tube is the control leading-out end; the first end of the third resistor is the power supply leading-out end, the second end of the third resistor is connected with the G pole of the second MOS tube, the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is grounded.
4. The power supply circuit of the electronic device according to claim 3, further comprising a key switch, a fifth diode, and a sixth diode; one end of the key switch is grounded, the other end of the key switch is connected with the cathode of the fifth diode, the anode of the fifth diode is connected with the control unit, the cathode of the sixth diode is connected with the cathode of the fifth diode, and the anode of the sixth diode is connected with the G pole of the second MOS tube.
5. The power supply circuit of claim 4, wherein a fifth resistor and a first capacitor are further connected to the enable pin.
6. The power supply circuit of claim 5, wherein a second capacitor is further connected to the power supply pin, and a third capacitor is further connected to the voltage output pin.
7. The power supply circuit of the electronic device according to claim 6, wherein the voltage conversion chip is a BUCK or LDO that converts a high voltage to a low voltage.
8. The power supply circuit of the electronic device according to claim 7, wherein the control unit is an MCU.
9. The power supply circuit of the electronic device according to claim 8, wherein a ratio of sizes of the first resistor to the second resistor is 2:1, and a ratio of sizes of the third resistor to the fourth resistor is 2: 1.
10. An electronic device, characterized in that it comprises a power supply circuit of an electronic device according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922412150.4U CN211349292U (en) | 2019-12-28 | 2019-12-28 | Power supply circuit of electronic equipment and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922412150.4U CN211349292U (en) | 2019-12-28 | 2019-12-28 | Power supply circuit of electronic equipment and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211349292U true CN211349292U (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922412150.4U Active CN211349292U (en) | 2019-12-28 | 2019-12-28 | Power supply circuit of electronic equipment and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211349292U (en) |
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- 2019-12-28 CN CN201922412150.4U patent/CN211349292U/en active Active
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