CN207994925U - The USB power supply circuits and electronic equipment to supply power with double circuit - Google Patents

The USB power supply circuits and electronic equipment to supply power with double circuit Download PDF

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Publication number
CN207994925U
CN207994925U CN201820269697.6U CN201820269697U CN207994925U CN 207994925 U CN207994925 U CN 207994925U CN 201820269697 U CN201820269697 U CN 201820269697U CN 207994925 U CN207994925 U CN 207994925U
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China
Prior art keywords
power supply
resistor
capacitor
terminal
circuit
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Expired - Fee Related
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CN201820269697.6U
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Chinese (zh)
Inventor
石勤
陶攀
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TCL Tongli Electronics Huizhou Co Ltd
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TCL Tongli Electronics Huizhou Co Ltd
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Priority to CN201820269697.6U priority Critical patent/CN207994925U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Direct Current Feeding And Distribution (AREA)

Abstract

The utility model discloses a kind of USB power supply circuits and electronic equipment to supply power with double circuit, the circuit includes comparison control circuit, power switching circuit, power-switching circuit, the power input for accessing the power supply and the power output end for exporting supply voltage, wherein, power-switching circuit is used to after the supply voltage of power supply is converted into supply voltage export to power output end；Comparison control circuit is used for the control power switching circuit shutdown when the supply voltage for detecting power supply is greater than or equal to reference voltage, and when the supply voltage for detecting power supply is less than reference voltage, control power switching circuit is opened；The supply voltage that power switching circuit is used for when opening by standby power input is exported to power output end.It also can be that portable electronic product charges that the utility model, which realizes electronic equipment in the standby state, solve the problem of the case where portable electronic product is charged by electronic equipment is few, causes waste largely.

Description

USB power supply circuit with double-circuit power supply and electronic equipment
Technical Field
The utility model relates to an electronic circuit technical field, in particular to USB supply circuit and electronic equipment of double-circuit power supply.
Background
Most of the existing portable electronic products such as mobile phones, bluetooth speakers, tablet computers (ipads) and the like are charged through USB, so that more and more products which are directly plugged in to work, such as electronic devices such as computers, televisions and the like, are required to support USB charging of external devices. The system power SYS _ VCC is now generally used by electronic devices as a power supply for supplying power to portable electronic products. The current of the portable electronic product is large during charging (iPad requires 2.4A), which inevitably increases the workload of the system power supply of the electronic device, so that the system power supply also supports the large current design.
However, the portable electronic product is not charged by the electronic device, which causes a great waste. In addition, the portable electronic product is also required to be charged in a standby state of the electronic device, and the current electronic device cannot realize the function.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a USB supply circuit and electronic equipment of double-circuit power supply, aim at realizing that electronic equipment also can charge for portable electronic product under standby state, solve the system power and accomplish to support the heavy current design, portable electronic product is not many through the circumstances that electronic equipment charges, causes the extravagant problem of to a great extent.
In order to achieve the above object, the present invention provides a dual-power supply USB power supply circuit, which is applied to an electronic device having a power supply and a standby power supply, wherein the dual-power supply USB power supply circuit includes a comparison control circuit, a power supply switching circuit, a power conversion circuit, a power input terminal for connecting to the power supply and a power output terminal for outputting a power supply voltage, the power input terminal is respectively connected to a power detection terminal of the comparison control circuit and an input terminal of the power conversion circuit, and a control terminal of the comparison control circuit is connected to a controlled terminal of the power supply switching circuit; the input end of the power supply switching circuit is connected with the standby power supply, and the output end of the power supply switching circuit are respectively connected with the power supply output end; wherein,
the power supply conversion circuit is used for converting the power supply voltage of the power supply into the power supply voltage and then outputting the power supply voltage to the power supply output end;
the comparison control circuit is used for controlling the power supply switching circuit to be switched off when detecting that the power supply voltage of the power supply is greater than or equal to the reference voltage, and controlling the power supply switching circuit to be switched on when detecting that the power supply voltage of the power supply is less than the reference voltage;
and the power supply switching circuit is used for outputting the power supply voltage input by the standby power supply to the power supply output end when the power supply switching circuit is started.
Preferably, the comparison control circuit comprises a detection comparison unit and a switch control unit, an input end of the detection comparison unit is a detection end of the comparison control circuit, and an output end of the detection comparison unit and an output end of the switch control unit are connected with a controlled end of the switch control unit; the output end of the switch control unit is the controlled end of the comparison control circuit.
Preferably, the detection comparing unit includes a zener diode, a first resistor, a second resistor, a third resistor, and a first electronic switch, a cathode of the zener diode is an input terminal of the detection comparing unit, an anode of the zener diode is interconnected with a first terminal of the first resistor and a first terminal of the second resistor, and a second terminal of the first resistor is interconnected with a first terminal of the third resistor and a controlled terminal of the first electronic switch; the second end of the second resistor, the second end of the third resistor and the input end of the first electronic switch are all grounded; the output end of the first electronic switch is the output end of the detection comparison unit.
Preferably, the switch control unit includes a first capacitor, a fourth resistor, a fifth resistor, a sixth resistor, and a second electronic switch, a controlled end of the second electronic switch is a controlled end of the switch control unit and is connected to a first end of the fourth resistor, an input end of the second electronic switch is grounded, and an output end of the second electronic switch is an output end of the switch control unit and is interconnected with a first end of the fifth resistor, a first end of the sixth resistor, and a first end of the first capacitor; the second end of the fourth resistor is connected with the second end of the fifth resistor and the standby power supply; the second end of the sixth resistor is connected with the second end of the first resistor; the second end of the first capacitor is grounded.
Preferably, the power supply switching circuit includes a third electronic switch, a second capacitor and a third capacitor, a controlled end of the third electronic switch is a controlled end of the power supply switching circuit, an input end of the third electronic switch is an input end of the power supply switching circuit, and an output end of the third electronic switch is an output end of the power supply switching circuit and is interconnected with the first end of the second capacitor and the first end of the third capacitor; and the second end of the second capacitor and the second end of the third capacitor are both grounded.
Preferably, the power conversion circuit includes a voltage reduction chip, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a voltage feedback unit, and a filtering unit, where an input end of the voltage reduction chip is an input end of the power conversion circuit and is interconnected with a first end of the fourth capacitor, a first end of the fifth capacitor, a first end of the seventh resistor, and a first end of the ninth resistor, an output end of the voltage reduction chip is interconnected with an input end of the filtering unit and a first end of the ninth capacitor, and an enable end of the voltage reduction chip is interconnected with a second end of the seventh resistor, a first end of the sixth capacitor, and a first end of the eighth resistor; a second end of the fourth capacitor, a second end of the eighth resistor, a second end of the fifth capacitor and a second end of the sixth capacitor are all grounded; the second end of the ninth resistor is connected with the clock signal input end of the voltage reduction chip and the first end of the seventh capacitor; the second end of the seventh capacitor and the first end of the eighth capacitor are both grounded, and the second end of the eighth capacitor is connected with the power supply end of the voltage reduction chip; the output end of the filtering unit is the output end of the power conversion circuit and is connected with the detection end of the voltage feedback unit, the output end of the voltage feedback unit is connected with the signal feedback end of the voltage reduction chip, and the second end of the ninth capacitor is connected with the bootstrap end of the voltage reduction chip.
Preferably, the filtering unit includes a tenth capacitor, an eleventh capacitor and a first inductor, a first end of the first inductor is an input end of the filtering unit, a second end of the first inductor is an output end of the filtering unit, and is interconnected with a first end of the tenth capacitor and one end of the eleventh capacitor; a second terminal of the tenth capacitor and a second terminal of the eleventh capacitor are both grounded.
Preferably, the voltage feedback unit includes a tenth resistor, an eleventh resistor, and an eleventh capacitor, a first end of the tenth resistor is a detection end of the voltage feedback unit, a second end of the tenth resistor is grounded via the eleventh resistor, a common end of the tenth resistor and the eleventh resistor is an output end of the voltage feedback unit, and the eleventh capacitor is disposed in parallel at two ends of the tenth resistor.
The utility model also provides an electronic device, which comprises a USB interface, a power supply, a standby power supply and the USB power supply circuit with double power supplies;
the power input end of the USB power supply circuit with double power supply is connected with the power supply, the power output end of the USB power supply circuit with double power supply is connected with the USB interface, and the power supply switching circuit of the USB power supply circuit with double power supply is connected with the standby power supply.
Preferably, the electronic device further includes a main controller, a control end of the main controller is connected to the power supply, the main controller is configured to control the power supply to operate when receiving a power-on signal of the electronic device, and control the power supply to stop operating when receiving a standby signal of the electronic device.
The utility model discloses double-circuit power supply's USB supply circuit is through setting up power conversion circuit to be connected with power supply through the power input end, thereby output to power output end after converting power supply's mains voltage into power supply voltage and supply power through the USB interface for portable electronic product at power supply normal during operation. Or when the power supply stops working, the power supply conversion and output are stopped. The utility model discloses still through setting up comparison control circuit to when detecting power supply's mains voltage be greater than or equal to reference voltage, control power supply switching circuit turn-offs, thereby control stand-by power supply stops exporting supply voltage, perhaps when detecting power supply's mains voltage be less than reference voltage, and control power supply switching circuit opens, export supply voltage to power output end through power supply switching circuit with control stand-by power supply, thereby supply power through the USB interface for portable electronic product. So set up for when electronic equipment normally worked, power supply provided power supply voltage for portable electronic product through the conversion circuit that changes, when electronic equipment was in standby state, standby power supply passed through the work of comparison control circuit drive power supply switching circuit, thereby for portable electronic product supplies power through the USB interface and provides power supply voltage for portable electronic product, realizes power supply circuit's double-circuit output. The utility model discloses an electronic equipment also can charge for portable electronic product under standby state, has solved the system power and has accomplished to support the heavy current design, and portable electronic product passes through the condition that electronic equipment charges not much, causes the extravagant problem of to a great extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of a dual-path power supply USB power supply circuit of the present invention;
fig. 2 is a schematic circuit structure diagram of a comparison control circuit in the dual-path power supply USB power supply circuit of fig. 1;
fig. 3 is a schematic circuit structure diagram of a power supply switching circuit in the dual-path power supply USB power supply circuit of fig. 1;
FIG. 4 is a schematic circuit diagram of a power conversion circuit in the dual-path USB power supply circuit of FIG. 1;
fig. 5 is a schematic diagram of a functional module of an embodiment of the electronic device according to the present invention, in which the USB power supply circuit for dual power supply is applied.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
100 USB power supply circuit with double power supplies U1 Step-down chip
10 Comparison control circuit L1 First inductor
11 Detection comparison unit R1～R11 First to eleventh resistors
12 Switch control unit C1～C13 First to thirteenth capacitors
20 Power supply switching circuit Q1 First electronic switch
30 Power supply conversion circuit Q2 Second electronic switch
31 Voltage feedback unit Q3 Third electronic switch
32 Filter unit MCU Main controller
Vin Power input terminal J1 USB interface
Vout Power supply output terminal VCC1 Standby power supply
ZD1 Voltage stabilizing diode VCC2 Power supply
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a USB supply circuit of double-circuit power supply is applied to in the electronic equipment that has power supply and stand-by power supply.
The electronic equipment can be an electronic equipment which has a USB interface and supports the USB interface to supply power, such as a computer, a television, a notebook computer and the like, and supplies power to portable electronic products such as a mobile phone, a Bluetooth sound box, a tablet personal computer (iPad) and the like through the USB. The system power SYS-VCC is now generally used by electronic devices as a power supply for powering portable electronic products. When the portable electronic product is charged, the current is large (iPad requires 2.4A), and the system power supply also needs to provide large current output, which inevitably increases the workload of the system power supply of the electronic device, so that the system power supply also correspondingly supports the large current design, and the current of the system power supply can reach 5A.
Moreover, the portable electronic product is not charged by the electronic device, which causes waste to a great extent. In addition, the portable electronic product is also required to be charged in a standby state of the electronic device, and the current electronic device cannot realize the function.
Referring to fig. 1 to 4, in an embodiment of the present invention, the dual-path power supply USB power supply circuit 100 includes a comparison control circuit 10, a power supply switching circuit 20, a power conversion circuit 30, a power input terminal Vin for accessing the power supply VCC2, and a power output terminal Vout for outputting a power supply voltage, where the power input terminal Vin is connected to a power detection terminal of the comparison control circuit 10 and an input terminal of the power conversion circuit 30, respectively, and a control terminal SW of the comparison control circuit 10 is connected to a controlled terminal of the power supply switching circuit 20; the input end of the power supply switching circuit 20 is connected to the standby power VCC1, and the output end of the power supply switching circuit 20 and the output end of the power conversion circuit 30 are respectively connected to the power output end Vout; wherein,
the power conversion circuit 30 is configured to convert a power voltage of the power supply VCC2 into the power voltage and output the power voltage to the power output terminal Vout;
the comparison control circuit 10 is configured to control the power supply switching circuit 20 to turn off when detecting that the power supply voltage of the power supply VCC2 is greater than or equal to a reference voltage, and control the power supply switching circuit 20 to turn on when detecting that the power supply voltage of the power supply VCC2 is less than the reference voltage;
the power supply switching circuit 20 is configured to output the power supply voltage input by the standby power VCC1 to the power output terminal Vout when being turned on.
It is understood that the power supply VCC2 can be a 12V/24V/36V DC power supply, and the power supply VCC2 of the present embodiment is preferably a 12V power output. The power supply VCC2 provides operating voltage for devices and circuits in the electronic device when the electronic device is operating normally, and stops power output when the electronic device is in a standby state. The standby power VCC1 is preferably a system power supply, which is typically 5V, and can provide operating voltage for the system of the electronic device when the electronic device is operating. Or when the electronic equipment is in a standby state, a standby voltage is provided for a system of the electronic equipment.
In this embodiment, the power conversion circuit 30 is preferably a DC-DC conversion circuit, which is connected to the power supply VCC2 through the power input terminal Vin, and when the power supply VCC2 works, converts the 12V power voltage output by the power supply VCC2 into a 5V power voltage and outputs the 5V power voltage to the USB interface J1 connected to the power output terminal Vout, so as to supply power to portable electronic products such as a mobile phone, a bluetooth sound box, and a tablet computer (iPad) through USB. Or when the power supply VCC2 stops operating, the power conversion and output are stopped.
In this embodiment, the reference voltage of the comparison control circuit 10 may be set according to the power voltage output by the power supply VCC2, for example, when the output power of the power supply VCC2 is 12V, the reference voltage may be set to 9-10V, preferably 9.6V. Of course, in other embodiments, the output power of the power supply VCC2 has other voltage values, and the reference voltage is set to the corresponding voltage value accordingly, which is not limited herein. When the comparison control circuit 10 detects that the output voltage of the power supply VCC2 is greater than or equal to 9.6V of the reference point voltage, it is determined that the power supply VCC2 normally operates, and controls the power supply switching circuit 20 to turn off to control the standby power VCC1 to stop outputting the power supply voltage. When the comparison control circuit 10 detects that the output voltage of the power supply VCC2 is less than 9.6V of the reference voltage, it is determined that the power supply VCC2 normally works, and controls the power supply switching circuit 20 to be turned on, so as to control the standby power VCC1 to output 5V of power supply voltage to the power output terminal Vout through the power supply switching circuit 20, thereby supplying power to portable electronic products such as mobile phones, bluetooth sound boxes, tablet computers (ipads) through the USB interface J1.
The utility model discloses a set up power conversion circuit 30 to be connected with power supply VCC2 through power input terminal Vin, with at power supply VCC2 normal during operation, thereby output power output terminal Vout for portable electronic product supplies power through USB interface J1 after converting power supply VCC 2's mains voltage to supply voltage. Or when the power supply VCC2 stops operating, the power conversion and output are stopped. The utility model discloses still through setting up comparison control circuit 10, in order when detecting power supply VCC 2's mains voltage be greater than or equal to reference voltage, control power supply switching circuit 20 turns off, thereby control stand-by power supply VCC1 stops exporting supply voltage, perhaps when detecting power supply VCC 2's mains voltage be less than reference voltage, and control power supply switching circuit 20 opens, in order to control stand-by power supply VCC1 export supply voltage to power output end Vout through power supply switching circuit 20, thereby supply power through USB interface J1 for portable electronic product. So set up for when electronic equipment normally worked, power supply VCC2 provided power supply voltage for portable electronic product through the conversion circuit of transversing, when electronic equipment was in standby state, standby power VCC1 passed through comparison control circuit 10 drive power supply switching circuit 20 work, thereby for portable electronic product supplies power through USB interface J1 and provides power supply voltage for portable electronic product, realize power supply circuit's double-circuit output. The utility model discloses an electronic equipment also can charge for portable electronic product under standby state, has solved the system power and has accomplished to support the heavy current design, and portable electronic product passes through the condition that electronic equipment charges not much, causes the extravagant problem of to a great extent.
Referring to fig. 1 to 4, in a preferred embodiment, the comparison control circuit 10 includes a detection comparison unit 11 and a switch control unit 12, an input end of the detection comparison unit 11 is a detection end of the comparison control circuit 10, and an output end of the detection comparison unit 11 and an output end of the switch control unit 12 are connected to a controlled end of the switch control unit 12; the output end of the switch control unit 12 is the controlled end SW of the comparison control circuit 10.
In this embodiment, the detection comparing unit 11 is configured to trigger the switch control unit 12 to output a high-level control signal to the power supply switching circuit 20 when detecting that the power voltage of the power supply VCC2 is greater than or equal to the reference voltage, so as to control the power supply switching circuit 20 to turn off, thereby controlling the standby power VCC1 to stop outputting the power voltage. Or when detecting that the power voltage of the power supply VCC2 is less than the reference voltage, the trigger switch control unit 12 outputs a low-level control signal to the power supply switching circuit 20 to control the power supply switching circuit 20 to be turned on, and controls the standby power VCC1 to output the power supply voltage to the power output terminal Vout through the power supply switching circuit 20, so as to supply power to the portable electronic product through the USB interface J1.
Referring to fig. 1 to 4, in the above embodiment, the detection comparing unit 11 includes a zener diode ZD1, a first resistor R1, a second resistor R2, a third resistor R3, and a first electronic switch Q1, a cathode of the zener diode ZD1 is an input terminal of the detection comparing unit 11, an anode of the zener diode ZD1 is interconnected with a first end of the first resistor R1 and a first end of the second resistor R2, and a second end of the first resistor R1 is interconnected with a first end of the third resistor R3 and a controlled end of the first electronic switch Q1; the second end of the second resistor R2, the second end of the third resistor R3 and the input end of the first electronic switch Q1 are all grounded; the output terminal of the first electronic switch Q1 is the output terminal of the detection and comparison unit 11.
In this embodiment, the conduction power of the zener diode ZD1 is preferably 7.5V, that is, when the voltage of the power supply VCC2 rises to 7.5V, the zener diode ZD1 is turned on. It can be understood that the resistance of the second resistor R2 is much larger than the dynamic internal resistance of the zener diode ZD1 when it is turned on, that is, the current output by the power supply VCC2 is equivalent to completely flowing out through the first resistor R1. The first electronic switch Q1 is preferably an NPN-type transistor, but in other embodiments, the first electronic switch Q1 may also be implemented by an electronic switch such as a MOS transistor, an IGBT, or the like, which is not limited herein. The on-voltage Vb of the first electronic switch Q1 is about 0.7V. When the current flowing through the third resistor R3 can be calculated to be 0.014mA, the voltage across the first resistor R1 is 1.4V. Therefore, it can be calculated that when the voltage of the power supply VCC2 rises to 0.7V +1.4V +7.5V, i.e. 9.6V, the first electronic switch Q1 is turned on. That is, the voltage value of the reference voltage may be set to 9.6V.
When the power supply VCC2 rises to 9.6V, which is greater than or equal to the reference voltage, the NPN transistor Q1 is turned on and outputs a low-level trigger signal to the switch control unit 12.
When the power supply VCC2 drops to 9.6V, which is less than the reference voltage, the NPN transistor Q1 turns off, and the fifth resistor R5 outputs the trigger signal of high level of 5V voltage of the standby power VCC1 to the switch control unit 12.
Referring to fig. 1 to 4, in the above embodiment, the switch control unit 12 includes a first capacitor C1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second electronic switch Q2, a controlled terminal of the second electronic switch Q2 is a controlled terminal of the switch control unit 12 and is connected to a first terminal of the fourth resistor R4, an input terminal of the second electronic switch Q2 is grounded, and an output terminal of the second electronic switch Q2 is an output terminal of the switch control unit 12 and is interconnected with a first terminal of the fifth resistor R5, a first terminal of the sixth resistor R6, and a first terminal of the first capacitor C1; a second end of the fourth resistor R4 is connected to a second end of the fifth resistor R5 and the standby power VCC 1; a second end of the sixth resistor R6 is connected with a second end of the first resistor R1; the second terminal of the first capacitor C1 is grounded.
In this embodiment, the second electronic switch Q2 is preferably an NPN type triode, but in other embodiments, the second electronic switch Q2 may also be implemented by an electronic switch such as a MOS transistor and an IGBT, which is not limited herein.
The second electronic switch Q2 is turned on when receiving the trigger signal of the detection comparing unit 11 outputting a high level, and outputs a control signal of a low level to the power supply switching circuit 20 to control the power supply switching circuit 20 to be turned on, so as to control the standby power VCC1 to output a power supply voltage to the power output terminal Vout through the power supply switching circuit 20, thereby supplying power to the portable electronic product through the USB interface J1. And is cut off when receiving the trigger signal of detecting the output low level of the comparing unit 11, at this time, the sixth resistor R6 outputs the control signal of the high level of the standby power VCC15V to the power supply switching circuit 20 to control the power supply switching circuit 20 to be turned off, so as to control the standby power VCC1 to stop outputting the power supply voltage.
The first capacitor C1 and the sixth resistor R6 form a delay circuit, the first capacitor C1 charges through the sixth resistor R6 when the second electronic switch Q2 is turned off, the first capacitor C1 starts to charge at the moment when the second electronic switch Q2 is turned off, the first capacitor C1 is equivalent to a short circuit, at this time, the high-level control signal output by the sixth resistor R6 is pulled low by the second capacitor C2, and then, along with the completion of charging of the first capacitor C1, both ends of the first capacitor C1 are equivalent to an open circuit. By such arrangement, the high-level control signal can be controlled to be output in a delayed manner, so that the power supply switching circuit 20 is controlled to be switched off in a delayed manner until the voltage value of the high-level control signal reaches the voltage value of the switching-off signal of the power supply switching circuit 20. Therefore, when the power conversion circuit 30 does not start to operate yet in the process of switching the electronic device from the standby state to the operating state, the power supply switching circuit 20 controls the standby power VCC1 to maintain the output of the power supply voltage until the power conversion circuit 30 operates normally. Therefore, the problem of charging interruption is avoided, the charging quality of the portable electronic product is influenced, and the portable electronic product is prevented from being damaged.
When the second electronic switch Q2 is turned on, the first capacitor C1 discharges through the second electronic switch Q2, and thus the output speed of the low-level control signal is increased, so as to control the power supply switching circuit 20 to be turned off quickly until the voltage value of the low-level control signal reaches the voltage value of the on signal of the power supply switching circuit 20. Therefore, when the power conversion circuit 30 stops operating during the process of switching the electronic device from the operating state to the switching state, the power supply switching circuit 20 controls the standby power VCC1 to output the power supply voltage quickly. Therefore, the problem of charging interruption is avoided, the charging quality of the portable electronic product is influenced, and the portable electronic product is prevented from being damaged.
Referring to fig. 1 to 4, in a preferred embodiment, the power supply switching circuit 20 includes a third electronic switch Q3, a second capacitor C2 and a third capacitor C3, the controlled terminal of the third electronic switch Q3 is the controlled terminal of the power supply switching circuit 20, the input terminal of the third electronic switch Q3 is the input terminal of the power supply switching circuit 20, and the output terminal of the third electronic switch Q3 is the output terminal of the power supply switching circuit 20 and is interconnected with the first terminal of the second capacitor C2 and the first terminal of the third capacitor C3; a second terminal of the second capacitor C2 and a second terminal of the third capacitor C3 are both grounded.
In this embodiment, the third electronic switch Q3 is preferably implemented by a P-MOS transistor, but in other embodiments, the third electronic switch Q3 may also be implemented by an electronic switch such as a triode, an IGBT, or the like, which is not limited herein. The source of the P-MOS transistor is connected to the power supply of the motor, the drain of the P-MOS transistor is connected to the power output terminal Vout, and the P-MOS transistor is turned on when the gate of the P-MOS transistor receives a low-level control signal output by the comparison control circuit 10, so as to control the standby power VCC1 to output a power supply voltage to the power output terminal Vout through the power switching circuit 20, thereby supplying power to the portable electronic product through the USB interface J1. And is turned off when receiving a trigger signal of a high level output by the comparison control circuit 10, thereby controlling the standby power VCC1 to stop outputting the power supply voltage. The arrangement is such that when the power supply VCC2 works normally, the charging voltage can be provided for the portable electronic device through the power conversion circuit 30, and when the power supply VCC2 is standby, the charging voltage is provided for the portable electronic device through the standby power VCC1, so as to realize dual-path power output.
Referring to fig. 1 to 4, in a preferred embodiment, the power conversion circuit 30 includes a voltage-reducing chip U1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a voltage feedback unit 31, and a filtering unit 32, an input terminal of the voltage-reducing chip U1 is an input terminal of the power conversion circuit 30, and interconnected with a first terminal of the fourth capacitor C4, a first terminal of the fifth capacitor C5, a first terminal of the seventh resistor R7, and a first terminal of the ninth resistor R9, an output terminal of the buck chip U1 is interconnected with an input terminal of the filtering unit 32 and a first terminal of the ninth capacitor C9, an enable terminal of the buck chip U1 is interconnected with the second terminal of the seventh resistor R7, the first terminal of the sixth capacitor C6 and the first terminal of the eighth resistor R8; a second terminal of the fourth capacitor C4, a second terminal of the eighth resistor R8, a second terminal of the fifth capacitor C5, and a second terminal of the sixth capacitor C6 are all grounded; a second end of the ninth resistor R9 is connected with a clock signal input end of the buck chip U1 and a first end of the seventh capacitor C7; a second end of the seventh capacitor C7 and a first end of the eighth capacitor C8 are both grounded, and a second end of the eighth capacitor C8 is connected to a power supply terminal of the buck chip U1; the output end of the filtering unit 32 is the output end of the power conversion circuit 30, and is connected to the detection end of the voltage feedback unit 31, the output end of the voltage feedback unit 31 is connected to the signal feedback end of the buck chip U1, and the second end of the ninth capacitor C9 is connected to the bootstrap end of the buck chip U1.
In this embodiment, the buck chip U1 is a DC-DC conversion chip, and is preferably implemented by a SY8213 type buck chip U1. The output current can reach 3A, the enabling end of the voltage reduction chip U1 is charged through the seventh resistor R7 in the first capacitor C1C1, and is pulled high to high level to start working when charging is completed, and the voltage of the 12V power supply VCC2 is reduced to 5V and then is filtered by the filtering unit 32 and then is output to the power output end Vout, so that the charging voltage is provided for the portable electronic equipment. The seventh resistor R7 and the eighth resistor R8 are connected in series to divide voltage, so that the voltage division ratio of the output to the enabling end can be adjusted by adjusting the seventh resistor R7 and the eighth resistor R8, and the working starting voltage of the buck chip U1 is set.
Referring to fig. 1 to 4, in the above embodiment, the filter unit 32 includes a tenth capacitor C10, an eleventh capacitor C11 and a first inductor L1, a first end of the first inductor L1 is an input end of the filter unit 32, a second end of the first inductor L1 is an output end of the filter unit 32, and is interconnected with a first end of the tenth capacitor C10 and an end of the eleventh capacitor C11; a second terminal of the tenth capacitor C10 and a second terminal of the eleventh capacitor C11 are both grounded.
In this embodiment, the filtering unit 32 composed of the tenth capacitor C10, the eleventh capacitor C11 and the first inductor L1 filters the power supply voltage output by the buck chip U1 to filter out high-frequency noise of the power supply voltage, thereby achieving stable output of the power supply voltage.
Further, in the above embodiment, the voltage feedback unit 31 includes a tenth resistor R10, an eleventh resistor R11 and an eleventh capacitor C11, the first end of the tenth resistor R10 is the detection end of the voltage feedback unit 31, the second end of the tenth resistor R10 is grounded via the eleventh resistor R11, the common end of the tenth resistor R10 and the eleventh resistor R11 is the output end of the voltage feedback unit 31, and the eleventh capacitor C11 is disposed in parallel at two ends of the tenth resistor R10.
In this embodiment, the tenth resistor R10 and the eleventh resistor R11 are connected in series to divide the voltage to detect the supply voltage, and output the voltage detection signal to the signal feedback terminal of the buck chip U1, so as to ensure that the buck chip U1 outputs a stable voltage. The voltage VOUT output by the output terminal of the buck chip U1 can be calculated according to equation (1):
VOUT＝Vref1*(R10+R11)/R11 (1)
wherein, Vref1 is the reference voltage value of the feedback end of the signal of the buck chip U1, and is generally set to 0.6V. The voltage division ratio of the tenth resistor R10 and the eleventh resistor R11 controls the voltage of the output end of the buck chip U1 to be maintained at about 5V for output.
The utility model discloses still provide an electronic equipment.
Referring to fig. 5, the electronic device includes a USB interface J1, a power supply VCC2, a standby power VCC1, and the dual-powered USB power supply circuit 100 as described above; the detailed structure of the dual-path power supply USB power supply circuit 100 can refer to the above embodiments, and is not described herein again; it can be understood that, because the utility model discloses the USB supply circuit 100 of above-mentioned double-circuit power supply has been used in the USB supply circuit 100 of double-circuit power supply, consequently, the utility model discloses the embodiment of USB supply circuit 100 of double-circuit power supply includes all technical scheme of the whole embodiments of USB supply circuit 100 of above-mentioned double-circuit power supply, and the technical effect that reaches is also identical, no longer explains herein.
The power supply input end Vin of the dual-path power supply USB power supply circuit 100 is connected with the power supply VCC2, the power output end Vout of the dual-path power supply USB power supply circuit 100 is connected with the USB interface J1, and the power supply switching circuit 20 of the dual-path power supply USB power supply circuit 100 is connected with the standby power supply VCC 1.
Referring to fig. 5, in the embodiment, the dual-powered USB power supply circuit 100 is arranged such that when the electronic device is in the standby state, the dual-powered USB power supply circuit 100 controls the standby power VCC1 to output the power supply voltage to the USB interface J1, thereby supplying power to the portable electronic device, and when the electronic device normally works, the dual-powered USB power supply circuit 100 controls the power supply VCC2 to output the converted power supply voltage to the USB interface J1, thereby enabling the electronic device to output the power supply voltage in the working state and the standby state. And the dual-path power supply USB power supply circuit 100 can convert the power supply VCC2 into power supply voltage output, thereby reducing the workload of the system power supply, namely the standby power supply VCC 1.
Further, in the above embodiment, the electronic device further includes a main controller MCU, a control end of the main controller MCU is connected to the power supply VCC2, the main controller MCU is configured to control the power supply VCC2 to operate when receiving a power-on signal of the electronic device, and control the power supply VCC2 to stop operating when receiving a standby signal of the electronic device.
In this embodiment, it can be understood that the operating state or the standby state of the power supply VCC2 is controlled by the main controller MCU. With the above arrangement, when the power supply VCC2 is in an operating state, the power conversion circuit 30 in the dual-path power supply USB power supply circuit 100 converts the power supply voltage output by the power supply VCC2 into the power supply voltage and outputs the power supply voltage. And stops the power conversion and output when the power supply VCC2 is in the standby state.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims (10)

1. A dual-power supply USB power supply circuit is applied to electronic equipment with a power supply and a standby power supply, and is characterized in that the dual-power supply USB power supply circuit comprises a comparison control circuit, a power supply switching circuit, a power supply conversion circuit, a power supply input end for accessing the power supply and a power supply output end for outputting power supply voltage, wherein the power supply input end is respectively connected with a power supply detection end of the comparison control circuit and an input end of the power supply conversion circuit, and a control end of the comparison control circuit is connected with a controlled end of the power supply switching circuit; the input end of the power supply switching circuit is connected with the standby power supply, and the output end of the power supply switching circuit are respectively connected with the power supply output end; wherein,
the power supply conversion circuit is used for converting the power supply voltage of the power supply into the power supply voltage and then outputting the power supply voltage to the power supply output end;
the comparison control circuit is used for controlling the power supply switching circuit to be switched off when detecting that the power supply voltage of the power supply is greater than or equal to the reference voltage, and controlling the power supply switching circuit to be switched on when detecting that the power supply voltage of the power supply is less than the reference voltage;
and the power supply switching circuit is used for outputting the power supply voltage input by the standby power supply to the power supply output end when the power supply switching circuit is started.
2. The dual-power supply USB power supply circuit according to claim 1, wherein the comparison control circuit comprises a detection comparison unit and a switch control unit, an input end of the detection comparison unit is a detection end of the comparison control circuit, and an output end of the detection comparison unit and an output end of the switch control unit are connected with a controlled end of the switch control unit; the output end of the switch control unit is the controlled end of the comparison control circuit.
3. The dual-power supply USB power supply circuit according to claim 2, wherein the detection comparison unit comprises a zener diode, a first resistor, a second resistor, a third resistor and a first electronic switch, wherein a cathode of the zener diode is an input terminal of the detection comparison unit, an anode of the zener diode is interconnected with a first terminal of the first resistor and a first terminal of the second resistor, and a second terminal of the first resistor is interconnected with a first terminal of the third resistor and a controlled terminal of the first electronic switch; the second end of the second resistor, the second end of the third resistor and the input end of the first electronic switch are all grounded; the output end of the first electronic switch is the output end of the detection comparison unit.
4. A dual-power-supply USB power supply circuit according to claim 3, wherein the switch control unit includes a first capacitor, a fourth resistor, a fifth resistor, a sixth resistor, and a second electronic switch, the controlled terminal of the second electronic switch is the controlled terminal of the switch control unit and is connected to the first terminal of the fourth resistor, the input terminal of the second electronic switch is grounded, and the output terminal of the second electronic switch is the output terminal of the switch control unit and is interconnected to the first terminal of the fifth resistor, the first terminal of the sixth resistor, and the first terminal of the first capacitor; the second end of the fourth resistor is connected with the second end of the fifth resistor and the standby power supply; the second end of the sixth resistor is connected with the second end of the first resistor; the second end of the first capacitor is grounded.
5. The dual-power supply USB power supply circuit according to claim 1, wherein the power supply switching circuit comprises a third electronic switch, a second capacitor and a third capacitor, the controlled terminal of the third electronic switch is the controlled terminal of the power supply switching circuit, the input terminal of the third electronic switch is the input terminal of the power supply switching circuit, and the output terminal of the third electronic switch is the output terminal of the power supply switching circuit and is interconnected with the first terminal of the second capacitor and the first terminal of the third capacitor; and the second end of the second capacitor and the second end of the third capacitor are both grounded.
6. A dual-supply USB supply circuit as in any one of claims 1 to 5, the power conversion circuit comprises a voltage reduction chip, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a voltage feedback unit and a filtering unit, wherein the input end of the voltage reduction chip is the input end of the power conversion circuit, and is interconnected with a first terminal of the fourth capacitor, a first terminal of the fifth capacitor, a first terminal of the seventh resistor, and a first terminal of the ninth resistor, the output end of the voltage reduction chip is interconnected with the input end of the filtering unit and the first end of the ninth capacitor, the enabling end of the voltage reduction chip is interconnected with the second end of the seventh resistor, the first end of the sixth capacitor and the first end of the eighth resistor; a second end of the fourth capacitor, a second end of the eighth resistor, a second end of the fifth capacitor and a second end of the sixth capacitor are all grounded; the second end of the ninth resistor is connected with the clock signal input end of the voltage reduction chip and the first end of the seventh capacitor; the second end of the seventh capacitor and the first end of the eighth capacitor are both grounded, and the second end of the eighth capacitor is connected with the power supply end of the voltage reduction chip; the output end of the filtering unit is the output end of the power conversion circuit and is connected with the detection end of the voltage feedback unit, the output end of the voltage feedback unit is connected with the signal feedback end of the voltage reduction chip, and the second end of the ninth capacitor is connected with the bootstrap end of the voltage reduction chip.
7. The dual-power supply USB power supply circuit according to claim 6, wherein the filter unit comprises a tenth capacitor, an eleventh capacitor and a first inductor, a first end of the first inductor is an input end of the filter unit, a second end of the first inductor is an output end of the filter unit, and is interconnected with a first end of the tenth capacitor and one end of the eleventh capacitor; a second terminal of the tenth capacitor and a second terminal of the eleventh capacitor are both grounded.
8. The dual-power-supply USB power supply circuit according to claim 7, wherein the voltage feedback unit includes a tenth resistor, an eleventh resistor, and an eleventh capacitor, a first end of the tenth resistor is a detection end of the voltage feedback unit, a second end of the tenth resistor is grounded via the eleventh resistor, a common end of the tenth resistor and the eleventh resistor is an output end of the voltage feedback unit, and the eleventh capacitor is disposed in parallel at two ends of the tenth resistor.
9. An electronic device, characterized by comprising a USB interface, a power supply, a standby power supply and a dual-power supply USB power supply circuit according to any one of claims 1 to 8;
the power input end of the USB power supply circuit with double power supply is connected with the power supply, the power output end of the USB power supply circuit with double power supply is connected with the USB interface, and the power supply switching circuit of the USB power supply circuit with double power supply is connected with the standby power supply.
10. The electronic device of claim 9, further comprising a main controller, wherein a control terminal of the main controller is connected to the power supply, and the main controller is configured to control the power supply to operate when receiving a power-on signal of the electronic device, and control the power supply to stop operating when receiving a standby signal of the electronic device.
CN201820269697.6U 2018-02-24 2018-02-24 The USB power supply circuits and electronic equipment to supply power with double circuit Expired - Fee Related CN207994925U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109781186A (en) * 2019-02-28 2019-05-21 电子科技大学中山学院 Low-power-consumption temperature and humidity detection system and detection method thereof
CN112130655A (en) * 2020-08-28 2020-12-25 浪潮电子信息产业股份有限公司 Power supply circuit of equipment to be refreshed and server
CN113608606A (en) * 2021-07-23 2021-11-05 深圳海翼智新科技有限公司 Interface circuit and network camera
CN115756133A (en) * 2022-11-03 2023-03-07 南京微智新科技有限公司 Output power supply circuit and electronic equipment that intelligence switches

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109781186A (en) * 2019-02-28 2019-05-21 电子科技大学中山学院 Low-power-consumption temperature and humidity detection system and detection method thereof
CN112130655A (en) * 2020-08-28 2020-12-25 浪潮电子信息产业股份有限公司 Power supply circuit of equipment to be refreshed and server
CN112130655B (en) * 2020-08-28 2022-06-10 浪潮电子信息产业股份有限公司 Power supply circuit of equipment to be refreshed and server
CN113608606A (en) * 2021-07-23 2021-11-05 深圳海翼智新科技有限公司 Interface circuit and network camera
CN115756133A (en) * 2022-11-03 2023-03-07 南京微智新科技有限公司 Output power supply circuit and electronic equipment that intelligence switches

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