CN111628551B - Power supply circuit, power supply system and power supply method - Google Patents

Power supply circuit, power supply system and power supply method Download PDF

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Publication number
CN111628551B
CN111628551B CN202010539805.9A CN202010539805A CN111628551B CN 111628551 B CN111628551 B CN 111628551B CN 202010539805 A CN202010539805 A CN 202010539805A CN 111628551 B CN111628551 B CN 111628551B
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Prior art keywords
power supply
voltage
output
communication
resistor
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CN202010539805.9A
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CN111628551A (en
Inventor
张建志
贾佩红
黄李
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Shenzhen Transsion Holdings Co Ltd
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Shenzhen Transsion Holdings Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/30—Charge provided using DC bus or data bus of a computer
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses power supply circuit, power supply system and power supply method, power supply circuit includes: the voltage conversion module comprises a power supply positive output end and a power supply negative output end, and is connected with electric equipment through the power supply positive output end and the power supply negative output end; the detection module is connected with the voltage conversion module and comprises a first communication end and a second communication end, and the first communication end and the second communication end are used as input ends of the detection module and are in communication connection with the electric equipment; a first resistor coupled between the first communication terminal and the second communication terminal; the detection module is used for detecting voltages at two ends of the first resistor, or the detection module is used for detecting currents on the first communication end and the second communication end, so that the voltage conversion module is controlled to output corresponding power supply voltage to the electric equipment according to the voltages or the currents. The charger has the advantage of simplifying the circuit structure of the quick charger.

Description

Power supply circuit, power supply system and power supply method
Technical Field
The present disclosure relates to power supply technologies, and in particular, to a power supply circuit, a power supply system, and a power supply method.
Background
With the rapid development of electronic consumer products, handheld terminal products such as mobile phones, cameras, tablet computers and the like are rapidly popularized. In order to improve portability and convenience of use of the handheld terminal product, a battery has become an essential component of the handheld terminal product, and provides power support for operation of each functional circuit inside the handheld terminal. In order to improve the charging efficiency of the mobile phone, various fast charging protocols and chargers adaptive to the fast charging protocols exist currently, and in order to adapt to the charging protocols, charger circuits are generally complex.
The above description is only for illustrating the technical problems to be solved by the present application, and does not represent that the above description is the prior art.
Disclosure of Invention
The main purpose of this application is to provide a supply circuit, aim at solving the comparatively complicated problem of charger circuit with the agreement adaptation that fills soon among the prior art.
To achieve the above object, the present application proposes a power supply circuit, which includes: the voltage conversion module comprises a power supply positive output end and a power supply negative output end, and is connected with the electric equipment through the power supply positive output end and the power supply negative output end; the detection module is connected with the voltage conversion module and comprises a first communication end and a second communication end, and the first communication end and the second communication end are used as input ends of the detection module and are in communication connection with the electric equipment; a first resistor coupled between the first communication terminal and the second communication terminal; the detection module is used for detecting voltages at two ends of the first resistor, or the detection module is used for detecting currents on the first communication end and the second communication end, so that the voltage conversion module is controlled to output corresponding power supply voltage to the electric equipment according to the voltages or the currents.
Furthermore, the detection module is a four-port device, the detection module further comprises a first output end and a second output end, the first output end is connected to the voltage conversion module, and the second output end is connected to an original edge ground; the first output end and the second output end have a first connection state of mutual disconnection and a second connection state of mutual connection according to voltage at two ends of the first resistor or current on the first communication end and the second communication end.
Further, the four-port device is a photoelectric coupler.
Further, the voltage conversion module is a primary side feedback type switching power supply.
Further, the primary side feedback type switching power supply comprises a control chip, a transformer and a voltage feedback network; the transformer comprises an output winding, an input winding and an auxiliary winding, wherein the input winding and the auxiliary winding are coupled with the output winding; the voltage feedback network comprises a second resistor, a third resistor and a fourth resistor; the feedback end of the control chip is connected with the first end of the auxiliary winding through the second resistor, and the second end of the auxiliary winding is connected with a primary side ground; the feedback end of the control chip is also connected with a primary side ground through the third resistor; and the feedback end of the control chip is also connected with the first output end of the photoelectric coupler through the fourth resistor.
Furthermore, the primary side feedback type switching power supply also comprises a rectifying circuit and an electronic switch; the rectifier circuit is provided with a positive power output end and a negative power output end, the negative power output end is connected with a primary side ground, the positive power output end is connected with the primary side ground through the input winding and the electronic switch, and the control end of the electronic switch is connected with the output end of the control chip.
Furthermore, the power supply interface type of the power supply circuit is a USB power supply interface, the positive output end of the power supply is VBUS of the USB charging interface, the negative output end of the power supply is GND of the USB charging interface, the first communication end is D + of the USB power supply interface, and the first communication end is D-of the USB power supply interface.
To achieve the above object, the present application further provides a power adapter including the power supply circuit as described in any one of the above.
In order to achieve the above object, the present application further provides a power supply system, where the power supply system includes a power adapter and a power consumption device, the power adapter includes a power supply circuit, and the power supply circuit includes a voltage conversion module, a detection module, and a first resistor; the voltage conversion module comprises a power supply positive output end and a power supply negative output end, and the electric equipment is connected with the power supply positive output end and the power supply negative output end of the power supply circuit so as to supply power to the electric equipment through the power supply circuit; the detection module is connected with the voltage conversion module and comprises a first communication end and a second communication end, and the first resistor is coupled between the first communication end and the second communication end; the electric equipment comprises a regulation and control circuit, the electric equipment comprises a third communication end and a fourth communication end which are used as output ends, the third communication end is connected with the first communication end, and the fourth communication end is connected with the second communication end.
Further, the power supply positive output end and the power supply negative output end of the power supply circuit have a first output state and a second output state, wherein the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the third communication terminal to output a first voltage and controls the fourth communication terminal to output a second voltage; when the difference value of the first voltage and the second voltage is smaller than or equal to a preset voltage, the power supply circuit is switched to a first output state; and/or when the difference value of the first voltage and the second voltage is greater than a preset voltage, the power supply circuit is switched to a second output state.
Further, the third communication terminal is grounded, and the regulation and control circuit further includes: the first electronic switch is connected with the fourth communication end and the power supply, and the electric equipment controls the difference value of the first voltage and the second voltage by controlling the on-off state of the first electronic switch.
Further, the fourth communication terminal is grounded, and the regulation and control circuit further includes: and the second electronic switch is connected with the third communication end and the power supply, and the electric equipment controls the difference value of the first voltage and the second voltage by controlling the on-off state of the second electronic switch.
Furthermore, the regulation and control circuit further comprises a fifth resistor and a sixth resistor, wherein one end of the fifth resistor is connected with a power supply, the other end of the fifth resistor is connected with the third communication end, one end of the sixth resistor is connected with the fourth communication end, and the other end of the sixth resistor is grounded; an on-off control switch is connected between the fifth resistor and the power supply in series, and/or an on-off control switch is connected between the sixth resistor and the ground in series, and the electric equipment controls the difference value between the first voltage and the second voltage by controlling the on-off of the on-off control switch.
Further, the power supply positive output end and the power supply negative output end of the power supply circuit have a first output state and a second output state, wherein the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the third communication end and the fourth communication end to be in short circuit, and current is input to the third communication end and the fourth communication end; when the current is smaller than or equal to a preset current, the power supply circuit is switched to a first output state, and/or when the current is larger than the preset current, the power supply circuit is switched to a second output state.
In order to achieve the above object, the present application further provides a power supply method applied to the power supply circuit as described above, the power supply method including the steps of:
the detection module acquires a measured value of the first resistance;
when the measured value is smaller than or equal to a preset value, the detection module controls the voltage conversion module to output a corresponding power supply voltage in a first output state; and/or the presence of a gas in the gas,
when the measured value is larger than a preset value, the detection module controls the voltage conversion module to output a corresponding power supply voltage in a second output state;
and the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state.
Further, the measured value is a voltage value and/or a current value, when the measured value is a voltage value at two ends of the first resistor, the preset value is a preset voltage, and when the measured value is a current value flowing through the first resistor, the preset value is a preset current.
In the technical scheme of this application, through first communication end with couple between the second communication end first resistance supply circuit with consumer connects the back, consumer can change the voltage at first resistance both ends or flow through the electric current on first communication end and the second communication end, afterwards, detection module obtains according to the detection the voltage at first resistance both ends or flow through the electric current on first communication end and the second communication end compares with the default, control voltage conversion module output corresponding supply voltage, and pass through voltage conversion module's the positive output of power supply and the negative output of power supply give consumer supplies power. After the power consumption equipment is connected with the power supply circuit, the voltage at two ends of the first resistor or the current flowing through the first communication end and the second communication end can be regulated and controlled, so that the detection circuit controls the voltage conversion module to output high-voltage power supply voltage, and high-voltage rapid power supply of the power supply equipment is realized. Through improving current supply circuit, supply voltage only includes first resistance, detection module and voltage conversion module and can realize the high pressure quick power supply to consumer, has simplified the circuit structure who fills the charger soon.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings 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 application, 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 a power supply circuit and a power-consuming device according to an embodiment of the present disclosure.
Fig. 2 is a circuit diagram of an embodiment of a power supply circuit of the present application.
Fig. 3 is a schematic circuit diagram of an embodiment of the power supply system of the present application.
Fig. 4 is a schematic circuit diagram of another embodiment of the power supply system of the present application.
Fig. 5 is a schematic circuit diagram of another embodiment of the power supply system of the present application.
Fig. 6 is a schematic circuit diagram of another embodiment of the power supply system of the present application.
Fig. 7 is a schematic flowchart of an embodiment of a power supply method according to the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like 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 of "first", "second", etc. in the embodiments of the present application, 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, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
In one embodiment of the present application, referring to fig. 1, the power supply circuit includes: the voltage conversion module comprises a power supply positive output end VBUS and a power supply negative output end GND, and is connected with electric equipment through the power supply positive output end VBUS and the power supply negative output end GND; the detection module is connected with the voltage conversion module and comprises a first communication end D + and a second communication end D-, and the first communication end D + and the second communication end D-serve as input ends of the detection module and are in communication connection with the electric equipment; a first resistor R1, the first resistor R1 being coupled between the first communication terminal D + and a second communication terminal D-; the detection module is configured to detect a voltage across the first resistor R1, or the detection module is configured to detect currents at the first communication terminal D + and the second communication terminal D-, so as to control the voltage conversion module to output a corresponding supply voltage to the electrical device according to the voltage or the current.
In this embodiment, the power supply circuit may be applied to a portable mobile power source such as a charger for supplying power to a mobile terminal such as a mobile phone, and the power supply circuit may also be applied to a power adapter for supplying power to a mobile terminal, or for supplying power to a mobile terminal or a battery in a mobile terminal, the power supply circuit is particularly suitable for a Dedicated power adapter supporting a Dedicated power supply Port (DCP), the Dedicated power supply Port (DCP) is one of three power supply ports specified by USB Charging specification-BC 1.2 fast Charging protocol, the other two power supply ports specified by BC1.2 fast Charging protocol are a Standard downlink Port (Standard downlink Port) and a SDP (CDP), the Dedicated power adapter communicates with a power consumption device to be supplied with power through the power supply circuit, and under the control of the power consumption device, the power supply circuit can supply high-voltage power to the electric equipment so as to realize the quick charging of a battery in the electric equipment, namely, based on the power supply circuit and the preset power supply rule, the rapid charging protocol meeting the related regulation of the BC1.2 rapid charging protocol is provided.
In this embodiment, the positive power supply output terminal VBUS and the negative power supply output terminal GND may be the charging terminal VBUS and the ground terminal GND of the USB power supply interface specified by the BC1.2 fast charging protocol, the first communication end D + of the detection module can be a communication end D + of a USB power supply interface specified by a BC1.2 quick charging protocol, the second communication end D-of the power supply circuit can be a communication end D-of a USB power supply interface specified by BC1.2 quick charging protocol, the power supply circuit realizes communication with the electric equipment and/or data transmission through the first communication terminal D + and the second communication terminal D-, when the power supply circuit is used for a power adapter, the first communication end D + and the second communication end D-are short-circuited (short-circuited), the electric equipment can identify that the power adapter connected with the electric equipment is a special charger, and at the moment, the currents flowing through the first communication terminal D + and the second communication terminal D-are the same.
In this embodiment, a first resistor R1 is connected across the first communication terminal D + and the second communication terminal D-, that is, one end of the first resistor R1 is connected to the first communication terminal D +, and the other end of the first resistor R1 is connected to the second communication terminal D-. The detection module is used for detecting the voltage across the first resistor R1 or the current flowing through the first communication terminal D + and the second communication terminal D-, wherein, after the power supply circuit is connected to the electric device, the electric device can change the current flowing across the first resistor R1 and/or the current flowing through the first communication terminal D + and the second communication terminal D-, and thereafter, the detection module compares the voltage at two ends of the first resistor R1 and/or the current flowing through the first communication end D + and the second communication end D-with a preset value according to the detected voltage and/or current, and controlling the voltage conversion module to output corresponding power supply voltage according to the comparison result, and supplying power to the electric equipment through a power supply positive output end VBUS and a power supply negative output end GND of the voltage conversion module. Particularly, after the electric equipment is connected with the power supply circuit, the detection circuit can control the voltage conversion module to output high-voltage power supply voltage by regulating and controlling the current at the two ends of the first resistor R1 and/or the current flowing through the first communication terminal D + and the second communication terminal D-, so as to realize high-voltage rapid power supply of the power supply equipment. It is understood that the first resistor R1 may be other components, such as a capacitor, a transistor, etc., capable of representing the required supply voltage of the powered device.
Specifically, the resistance of the first resistor R1 is less than 500 Ω, and after the power supply circuit is connected to the electrical device, because the resistance of the first resistor R1 is small, the electrical device can determine that the first communication terminal D + and the second communication terminal D-correspond to a short circuit according to the resistance of the first resistor R1, and thus can determine that the power supply port of the power supply circuit is a dedicated power supply port, that is, the electrical device can detect that the power adapter having the power supply circuit is a dedicated power adapter (DCP). In particular, the BC1.2 fast charging protocol specifies that the first communication terminal D + and the second communication terminal D-must be short-circuited, and the electric device can detect that the charging port is the dedicated charging port, in this embodiment, by setting the first resistor R1 and making the resistance value of the first resistor R1 smaller than 500 Ω, not only can the detection of the dedicated charging port be realized, but also the voltage value at the two ends of the first resistor R1 and the current flowing through the first resistor R1 can be sensitively and accurately detected, thereby providing a more accurate control basis for the voltage output by the voltage conversion module in the following; and the power supply voltage requirement of the electric equipment can be obtained only by arranging the first resistor R1 and detecting the current and/or voltage of the first resistor R1, and the circuit is simple in structure, easy to realize and low in cost.
In summary, in this embodiment, by coupling the first resistor R1 between the first communication terminal D + and the second communication terminal D ", after the power supply circuit is connected to the electric device, the electric device can change the voltage across the first resistor R1 or the current flowing through the first communication terminal D + and the second communication terminal D", and then the detection module compares the detected voltage across the first resistor R1 or the current flowing through the first communication terminal D + and the second communication terminal D-with a preset value, controls the voltage conversion module to output the corresponding power supply voltage, and supplies power to the electric device through the power supply positive output terminal VBUS and the power supply negative output terminal GND of the voltage conversion module. After the electric equipment is connected with the power supply circuit, the voltage at two ends of the first resistor R1 or the current flowing through the first communication end D + and the second communication end D-can be regulated and controlled, so that the detection circuit controls the voltage conversion module to output high-voltage power supply voltage, and high-voltage rapid power supply of the power supply equipment is realized. Through improving current supply circuit, supply voltage only includes first resistance R1, detection module and voltage conversion module and can realize the high pressure quick power supply to consumer, has simplified the circuit structure who fills the charger soon.
Referring to fig. 2, the detection module is a four-port device, the detection module further includes a first output terminal 4 and a second output terminal 3, the first output terminal 4 is connected to the voltage conversion module, and the second output terminal 3 is connected to the original edge ground; wherein the first output terminal 4 and the second output terminal 3 have a first connection state disconnected from each other and a second connection state connected to each other according to a voltage across the first resistor R1 or according to currents on the first communication terminal D + and the second communication terminal D-. In the following description, the four-port device is taken as an example of a photocoupler, and it is understood that the four-port device may be other circuits or devices capable of achieving the same circuit function.
In this embodiment, a first input terminal 1 and a second input terminal 2 of the photoelectric coupler are respectively connected to the first communication terminal D + and the second input terminal D-, the first output terminal 4 is connected to the voltage conversion module, and the second output terminal 3 is connected to the original ground; after the first communication terminal D + and the second input terminal D-are connected to the electric device, the electric device may change a voltage across the first resistor R1 or a current flowing through the first communication terminal D + and the second communication terminal D-, when the voltage across the first resistor R1 is less than a preset voltage, the photoelectric coupler is turned off, the first output terminal and the second output terminal of the photoelectric coupler are in a first connection state of being disconnected, when the voltage across the first resistor R1 is greater than the preset voltage, the photoelectric coupler is turned on, the first output terminal and the second output terminal of the photoelectric coupler are in a first connection state of being connected to each other, at this time, since the second output terminal 3 of the photoelectric coupler is grounded, the first output terminal 4 of the photoelectric coupler is also grounded; similarly, when the current flowing through the first communication terminal D + and the second communication terminal D-is less than or equal to the preset current, the photoelectric coupler is turned off, the first output terminal 4 and the second output terminal 3 of the photoelectric coupler are in the first connection state of disconnection, and when the current flowing through the first communication terminal D + and the second communication terminal D-is greater than the preset current, the photoelectric coupler is turned on, the first output terminal 4 and the second output terminal 3 of the photoelectric coupler are in the first connection state of mutual communication, at this time, because the second output terminal of the photoelectric coupler is grounded, the first output terminal 4 of the photoelectric coupler is grounded.
Referring to fig. 2, in one embodiment, the voltage conversion module is a primary side feedback type switching power supply. In one embodiment, the primary feedback type switching power supply includes a control chip U1, a transformer T, and a voltage feedback network; the transformer comprises an output winding NS, an input winding NP and an auxiliary winding NA, wherein the input winding NP and the auxiliary winding NA are coupled with the output winding NS; the voltage feedback network comprises a second resistor R2, a third resistor R3 and a fourth resistor R4; a feedback end FB of the control chip U1 is connected to a first end of the auxiliary winding NA through the second resistor R2, and a second end of the auxiliary winding NA is connected to a primary side ground; the feedback end FB of the control chip U1 is also connected with the primary side ground through the third resistor R3; the feedback terminal FB of the control chip U1 is further connected to the first output terminal 4 of the photocoupler through the fourth resistor R4. The primary side feedback type switching power supply also comprises a rectifying circuit and an electronic switch Q; the rectifier circuit is provided with a power supply positive output end and a power supply negative output end, the power supply negative output end is connected with a primary side ground, the power supply positive output end is connected with the primary side ground through the input winding NP and the electronic switch Q, and the control end of the electronic switch is connected with the output end OUT of the control chip. It is understood that the primary feedback type switching power supply can be in other circuit forms which can achieve the same circuit function.
In this embodiment, the rectified current D is preferably a bridge full-wave rectification circuit for rectifying Alternating Current (AC) supplied by mains into direct current and supplying the direct current to an input end of an input winding NP of the transformer T, the input winding NP and an auxiliary winding NA are both coupled to the output winding NS, a voltage across the output winding NS can be changed by changing the voltage across the input winding NP, and two ends of the output winding NS are respectively connected to the positive power supply output terminal VBUS and the negative power supply output terminal GND, that is, a power supply voltage across the positive power supply output terminal VBUS can be changed by changing the voltage across the input winding NP, since two ends of the input winding NP are respectively connected to the rectification circuit and the electronic switch Q, and a control end of the electronic switch D is connected to the control chip U1, and the control chip U1 outputs a duty cycle of a pulse signal for controlling on/off of the electronic switch D to the electronic switch D The control chip U1 controls the on/off time ratio of the electronic switch D to adjust the voltage supplied by the rectified current to the input winding NP.
The control chip U1 adjusts the voltage of the input winding NP according to the voltage of the auxiliary winding NA, and the control chip U1 finally makes the equivalent voltage of the input winding NP equal to the voltage of the auxiliary winding NA. Therefore, in this embodiment, by changing the voltage across the auxiliary winding NA, the control chip U1 controls the on/off duration of the electronic switch Q, so that the equivalent voltage of the input winding NP is equal to the voltage of the auxiliary winding NA, and the output winding NS is coupled to the auxiliary winding NA, thereby changing the supply voltages of the positive power supply output terminal VBUS and the negative power supply output terminal GND, and since the input terminal of the auxiliary winding NA is connected to the detection module and the control chip U1 through the voltage feedback network, the detection module can change the voltage across the auxiliary winding NA according to the detected voltage across the first resistor R1 or the current flowing through the first communication terminal D + and the second communication terminal D-.
Specifically, after the electric equipment is connected to the power supply circuit, one of the situations is as follows: the electric device regulates and controls the voltage across the first resistor R1 to be less than a preset voltage, if the preset voltage is 1V, the electric device regulates and controls the voltage across the first resistor R1 to be 0V, as can be seen from fig. 2, at this time, the photocoupler is not turned on, the fourth resistor R4 does not participate in voltage division, the supply voltage VBUS = VFB (1+ R2/R3) × (NS/NA) at the positive supply output terminal VBUS, wherein VFB is a reference voltage of the feedback terminal FB of the control chip U1, NS represents a coil number of the output winding NS, NA represents a coil number of the auxiliary winding NA, and the supply voltage VBUS obtainable by setting the resistance values of the second resistor R2, the third resistor R3 and the reference voltage VFB of the feedback terminal FB can be, for example, 5V; another case is: the electric device regulates the voltage across the first resistor R1 to be greater than a preset voltage, and if the preset voltage is 1V, the electric device regulates the voltage across the first resistor R1 to be 1.2V, as can be seen from fig. 2, at this time, the photocoupler is turned on, the fourth resistor R4 participates in voltage division, the supply voltage VBUS = VFB (1+ R2/Rd) (NS/NA) of the supply positive output terminal VBUS, wherein Rd = R3 × R4(R3+ R4), the available VBUS may be 7.5V, for example, by setting the resistance values of the second resistor R2, the third resistor R3 and the fourth resistor R4 and the reference voltage VFB of the feedback terminal FB, and at this time, the electric device is rapidly supplied with a high voltage at 7.5V, it can be understood that the preset voltage 1V, VBUS is 5V to be 7.5V, which is only used for illustration and is not necessarily limited to these values, other values are possible, for example, the supply voltage VBUS of the supply positive output terminal VBUS may be 9V, 15V, 20V, etc.
It can be understood that, since the resistance of the first resistor R1 is limited to be less than 500 Ω, when a preset voltage is set, according to ohm's law, a preset current of the first resistor R1 is also limited, and after the voltage across the first resistor R1 is known, according to ohm's law, a sampling current of the first resistor R1 can be known, so that the supply voltage of the voltage conversion module can be controlled according to the current flowing through the first communication terminal D + and the second communication terminal D-and the preset current, and the control method refers to the above-mentioned method of controlling the supply voltage according to the voltage across the first resistor R1 and the preset voltage.
To achieve the above object, the present application further provides a power adapter, which includes the power supply circuit as described above. In this embodiment, since the power adapter includes the power supply circuit as described above, the power adapter at least has the beneficial effects of the power supply circuit, which are not described herein again.
Referring to fig. 3, to achieve the above object, the present application provides a power supply system, where the power supply system includes the power adapter and a power consumption device, where the power adapter includes the power supply circuit, and the power supply circuit includes a voltage conversion module, a detection module, and a first resistor R1; the voltage conversion module comprises a power supply positive output end VBUS and a power supply negative output end GND, and the electric equipment is connected with the power supply positive output end VBUS and the power supply negative output end of the power supply circuit and is used for supplying power to the electric equipment through the power supply circuit; the detection module is connected with the voltage conversion module and comprises a first communication end D + and a second communication end D-, and the first resistor R1 is coupled to the first communication end D + and the second communication end D-; the electric equipment comprises a regulation and control circuit, the electric equipment comprises a third communication end D + and a fourth communication end D-which are used as output ends, the third communication end D + is connected with the first communication end D +, and the fourth communication end D-is connected with the second communication end D-.
In this embodiment, a rechargeable battery for supplying power to the electric device is disposed in the electric device. The electric equipment is connected with a positive power supply output end VBUS and a negative power supply output end GND of the power supply circuit, so that high-voltage rapid power supply is realized for the electric equipment through the power supply circuit. The regulation and control circuit comprises a third communication end D + and a fourth communication end D-, the third communication end D + is connected with the first communication end D +, the fourth communication end D-is connected with the second communication end D-, a power supply positive output end VBUS and a power supply negative output end GND of the power supply circuit have a first output state and a second output state, and the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the third communication terminal D + to output a first voltage and controls the fourth communication terminal D-to output a second voltage; when the difference value of the first voltage and the second voltage is smaller than or equal to a preset voltage, the power supply circuit is switched to a first output state; and/or when the difference value of the first voltage and the second voltage is greater than a preset voltage, the power supply circuit is switched to a second output state.
For example, the first voltage applied to the third communication terminal D + by the electric device is 0.6V, the second voltage applied to the fourth communication terminal D-is 3.3V, at this time, a voltage difference between the first communication terminal D + and the second communication terminal D-i.e., a voltage across the first resistor R1 is-2.7V, and is smaller than the preset voltage, e.g., 1V, and at this time, the positive supply output terminal VBUS outputs a supply voltage of 5V, i.e., a first output state; for another example, the first voltage applied to the third communication terminal D + by the electrical equipment is 4.5V, the second voltage applied to the fourth communication terminal D-is 3.3V, the voltage difference between the first communication terminal D + and the second communication terminal D-i.e. the voltage across the first resistor R1 is 1.2V, which is greater than the preset voltage 1V, and the power supply positive output terminal VBUS outputs a power supply voltage of 7.5V, i.e. a second output state, at this time, the power adapter can perform high-voltage fast power supply for the electrical equipment.
Referring to fig. 4, in another embodiment, the third communication terminal D + is grounded, and the regulation circuit further includes: the first electronic switch Q1, the first electronic switch Q1 is connected with the fourth communication end D-and a power supply, and the electric equipment controls the difference value between the first voltage and the second voltage by controlling the on-off of the first electronic switch Q1.
In this embodiment, when the electric device is connected to the power adapter, the third communication terminal D + is grounded, that is, the first communication terminal D + is grounded, and the first electronic switch Q1 connects the fourth communication terminal D-to a power supply, that is, the second communication terminal D-is connected to the power supply through the first electronic switch Q1, and the power supply may have a voltage of-1.2V, for example. The electric device may control on/off of the first electronic switch Q1, and the first electronic switch Q1 may be a resistor switch, a transistor, or the like, which is not limited in this embodiment. When the electric equipment can control the first electronic switch Q1 to be turned off, the voltage difference between the first communication terminal D + and the second communication terminal D-, that is, the voltage across the first resistor R1, is 0V, which is smaller than the preset voltage 1V, and the positive power supply output terminal VBUS outputs a 5V power supply voltage, that is, a first output state; when the electric equipment can control the first electronic switch Q1 to be turned on, the voltage difference between the first communication end D + and the second communication end D-, that is, the voltage across the first resistor R1, is 1.2V, which is greater than the preset voltage 1V, the power supply positive output end VBUS outputs a power supply voltage of 7.5V, that is, a second output state, and at this time, the power adapter can rapidly supply power to the electric equipment at a high voltage.
Referring to fig. 5, in another embodiment, the fourth communication terminal is grounded, and the regulation circuit further includes: the second electronic switch Q2, the second electronic switch Q2 is connected to the third communication terminal D + and the power supply, and the electric device controls the difference between the first voltage and the second voltage by controlling the on/off of the second electronic switch Q2.
In this embodiment, when the electrical device is connected to the power adapter, the fourth communication terminal D-is grounded, that is, the second communication terminal D-is grounded, and the second electronic switch Q2 connects the third communication terminal D + to a power supply, that is, the first communication terminal D + is connected to the power supply through the second electronic switch Q2, and the power supply may have a voltage of 1.2V, for example. The electric device may control on/off of the second electronic switch Q2, and the first electronic switch Q1 may be a resistor switch, a transistor, or the like, which is not limited in this embodiment. When the electric equipment can control the second electronic switch Q2 to be turned off, a voltage difference between a first communication terminal D + and a second communication terminal D-, that is, a voltage across the first resistor R1, is 0V and is smaller than the preset voltage 1V, and the power supply positive output terminal VBUS outputs a 5V power supply voltage, that is, a first output state; when the electric equipment can control the second electronic switch Q1 to be turned on, the voltage difference between the first communication end D + and the second communication end D-, that is, the voltage across the first resistor R1, is 1.2V, which is greater than the preset voltage 1V, the power supply positive output end VBUS outputs a power supply voltage of 7.5V, that is, a first output state, and at this time, the power adapter can rapidly supply power to the electric equipment at a high voltage.
Referring to fig. 6, in another embodiment, the regulation and control circuit further includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the power supply, the other end of the fifth resistor R5 is connected to the third communication terminal D +, one end of the sixth resistor R6 is connected to the fourth communication terminal D-, and the other end of the sixth resistor R6 is grounded; an on-off control switch Q3 is connected between the fifth resistor R5 and the power supply in series, and/or an on-off control switch Q4 is connected between the sixth resistor R6 and the ground in series, and the electric equipment controls the difference value between the first voltage and the second voltage by controlling the on-off of the on-off control switch.
In this embodiment, when the electric device is connected to the power adapter, the first communication terminal D + is connected to a power supply through the fifth resistor R5 and the on-off control switch Q3, and the power supply may have a voltage of 1.2V, for example; the second communication terminal D-is grounded through the sixth resistor R6 and the on-off control switch Q4, the electric device can control on and off of the on-off control switch Q3 and the on-off control switch Q4, and the on-off control switch Q3 and the on-off control switch Q4 are resistance switches, transistors, and the like, which is not limited in this embodiment. When the electric equipment controls the on-off control switch Q3 and the on-off control switch Q4 to be switched off, the voltage difference between the first communication end D + and the second communication end D-namely the voltage at two ends of the first resistor R1 is 0V and is smaller than the preset voltage 1V, and the power supply positive output end VBUS outputs 5V power supply voltage namely a first output state; when the electric equipment can control the on-off control switch Q3 and the on-off control switch Q4 to be turned on, the voltage difference between the first communication end D + and the second communication end D-, that is, the voltage across the first resistor R1, is 1.2V, which is greater than the preset voltage 1V, the power supply positive output end VBUS outputs a power supply voltage of 7.5V, that is, a first output state, and at this time, the power adapter can rapidly supply power to the electric equipment at a high voltage. It is understood that only one of the on-off control switch Q3 and the on-off control switch Q4 may be used, and the above functions may be achieved.
In another embodiment, the power supply positive output terminal and the power supply negative output terminal of the power supply circuit have a first output state and a second output state, wherein the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the third communication end to be in short circuit with the fourth communication end, and inputs current to the third communication end and the fourth communication end; when the current is smaller than or equal to a preset current, the power supply circuit is switched to a first output state, and/or when the current is larger than the preset current, the power supply circuit is switched to a second output state.
In this embodiment, a rechargeable battery for supplying power to the electric device is disposed in the electric device. The electric equipment is connected with a positive power supply output end VBUS and a negative power supply output end GND of the power supply circuit, so that high-voltage rapid power supply is realized for the electric equipment through the power supply circuit. The regulation and control circuit comprises a third communication end D + and a fourth communication end D-, the third communication end D + is connected with the first communication end D +, the fourth communication end D-is connected with the second communication end D-, a power supply positive output end VBUS and a power supply negative output end GND of the power supply circuit have a first output state and a second output state, and the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the current flowing through the third communication end D + and controls the current on the fourth communication end D-; when the current flowing through the third communication terminal D + and controlling the current on the fourth communication terminal D-is smaller than or equal to the preset current, the power supply circuit is switched to a first output state; and/or when the current flowing through the third communication terminal D + and controlling the current on the fourth communication terminal D-is larger than the preset current, the power supply circuit is switched to a second output state. For example, the electric device controls a current flowing through the third communication terminal D + and a current flowing through the fourth communication terminal D-to be 0mA, which is smaller than the preset current, for example, 3mA, and at this time, the power supply positive output terminal VBUS outputs a power supply voltage of 5V, that is, a first output state; for another example, the electric device controls the current flowing through the third communication terminal D + and the current flowing through the fourth communication terminal D-to be 4mA, which is greater than the preset voltage 3mA, and the power supply positive output terminal VBUS outputs a power supply voltage of 7.5V, i.e., a first output state, at this time, the power adapter can rapidly supply power to the electric device at a high voltage.
Specifically, the fourth communication terminal D-is grounded, and the regulation and control circuit further includes: and the third electronic switch is connected with the third communication end D + and the current source, the current source outputs a fixed current such as 4mA, and the electric equipment controls the current flowing through the third communication end D + and the current on the fourth communication end D-by controlling the on-off state of the third electronic switch. The third electronic switch may be a resistor switch, a transistor, etc., which is not limited in this embodiment. When the electric equipment can control the third electronic switch to be switched off, the current flowing through the third communication terminal D + and the fourth communication terminal D-is controlled to be 0mA, which is less than the preset current 3mA, and the power supply positive output terminal VBUS outputs a 5V power supply voltage, i.e., a first output state; when the electric equipment can control the third electronic switch to be turned on, the current flowing through the third communication end D + and the fourth communication end D-is controlled to be 4mA which is larger than the preset voltage of 3mA, the power supply positive output end VBUS outputs the power supply voltage of 7.5V, and at the moment, the power adapter can rapidly supply power to the electric equipment at high voltage.
Referring to fig. 7, based on the above power supply circuit or power adapter, the present application further provides a power supply method, where the power supply method includes the following steps:
step S10, the detection module obtains a measured value of the first resistance;
step S20, when the measured value is less than or equal to a preset value, the detection module controls the voltage conversion module to output a corresponding power supply voltage in a first output state; and/or the presence of a gas in the gas,
step S30, when the measured value is greater than the preset value, the detection module controls the voltage conversion module to output the corresponding power supply voltage in a second output state;
and the power supply voltage output in the second output state is greater than the power supply voltage output in the first output state.
In this embodiment, the measured value is a voltage value and/or a current value, the preset value is a preset voltage when the measured value is a voltage value across the first resistor, and the preset value is a preset current when the measured value is a current value flowing through the first resistor.
In a specific embodiment, when the measured value is a voltage value across the first resistor, the preset value is a preset voltage, and a rechargeable battery for supplying power to an electric device is disposed in the electric device. The electric equipment is connected with a positive power supply output end VBUS and a negative power supply output end GND of the power supply circuit, so that high-voltage rapid power supply is realized for the electric equipment through the power supply circuit. The regulation and control circuit comprises a third communication end D + and a fourth communication end D-, the third communication end D + is connected with the first communication end D +, the fourth communication end D-is connected with the second communication end D-, a power supply positive output end VBUS and a power supply negative output end GND of the power supply circuit have a first output state and a second output state, and the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the third communication terminal D + to output a first voltage and controls the fourth communication terminal D-to output a second voltage; when the difference value of the first voltage and the second voltage is smaller than or equal to a preset voltage, the power supply circuit is switched to a first output state; and/or when the difference value of the first voltage and the second voltage is greater than a preset voltage, the power supply circuit is switched to a second output state. For example, the first voltage applied to the third communication terminal D + by the electric device is 0.6V, the second voltage applied to the fourth communication terminal D-is 3.3V, at this time, a voltage difference between the first communication terminal D + and the second communication terminal D-i.e., a voltage across the first resistor R1 is-2.7V, and is smaller than the preset voltage, e.g., 1V, and at this time, the positive supply output terminal VBUS outputs a supply voltage of 5V, i.e., a first output state; for another example, the first voltage applied to the third communication terminal D + by the electrical equipment is 4.5V, the second voltage applied to the fourth communication terminal D-is 3.3V, the voltage difference between the first communication terminal D + and the second communication terminal D-i.e. the voltage across the first resistor R1 is 1.2V, which is greater than the preset voltage 1V, and the power supply positive output terminal VBUS outputs a power supply voltage of 7.5V, i.e. a second output state, at this time, the power adapter can perform high-voltage fast power supply for the electrical equipment.
In another embodiment, when the measured value is a current value flowing through the first resistor, and the preset value is a preset current, it can be understood that the current flowing through the third communication terminal D + and the current controlling the fourth communication terminal D-are also the current value flowing through the first resistor. And a rechargeable battery for supplying power to the electric equipment is arranged in the electric equipment. The electric equipment is connected with a positive power supply output end VBUS and a negative power supply output end GND of the power supply circuit, so that high-voltage rapid power supply is realized for the electric equipment through the power supply circuit. The regulation and control circuit comprises a third communication terminal D + and a fourth communication terminal D-, the third communication terminal D + is connected with the first communication terminal D +, the fourth communication terminal D-is connected with the second communication terminal D-, a power supply positive output terminal VBUS and a power supply negative output terminal GND of the power supply circuit have a first output state and a second output state, and the power supply voltage output by the second output state is greater than the power supply voltage output by the first output state; the electric equipment controls the current flowing through the third communication end D + and controls the current on the fourth communication end D-; when the current flowing through the third communication terminal D + and controlling the current on the fourth communication terminal D-is smaller than or equal to the preset current, the power supply circuit is switched to a first output state; and/or when the current flowing through the third communication terminal D + and controlling the current on the fourth communication terminal D-is larger than the preset current, the power supply circuit is switched to a second output state. For example, the electric device controls a current flowing through the third communication terminal D + and a current flowing through the fourth communication terminal D-to be 0mA, which is smaller than the preset current, for example, 3mA, and at this time, the power supply positive output terminal VBUS outputs a power supply voltage of 5V, that is, a first output state; for another example, the electric device controls the current flowing through the third communication terminal D + and the current flowing through the fourth communication terminal D-to be 4mA, which is greater than the preset voltage 3mA, and the power supply positive output terminal VBUS outputs a power supply voltage of 7.5V, which is a first output state, at this time, the power adapter can rapidly supply power to the electric device at a high voltage.
Embodiments of the present application also provide a computer program product, which includes computer program code, when the computer program code runs on a computer, the computer is caused to execute the method as described in the above various possible embodiments.
An embodiment of the present application further provides a chip, which includes a memory and a processor, where the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device installed with the chip executes the method described in the foregoing various possible embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element, and further, where similarly-named elements, features, or elements in different embodiments of the disclosure may have the same meaning, or may have different meanings, that particular meaning should be determined by their interpretation in the embodiment or further by context with the embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if," as used herein, may be interpreted as "at … …" or "when … …" or "in response to a determination," depending on the context. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the technical solutions that can be directly or indirectly applied to other related fields without departing from the spirit of the present application are intended to be included in the scope of the present application.

Claims (13)

1. A power supply circuit, characterized in that the power supply circuit comprises:
the voltage conversion module comprises a power supply positive output end and a power supply negative output end, and is connected with electric equipment through the power supply positive output end and the power supply negative output end;
the detection module is connected with the voltage conversion module and comprises a first communication end and a second communication end, the first communication end and the second communication end serve as input ends of the detection module and are in communication connection with the electric equipment, the electric equipment comprises a third communication end and a fourth communication end, the third communication end and the fourth communication end serve as output ends, the third communication end is connected with the first communication end, the fourth communication end is connected with the second communication end, the electric equipment controls the third communication end to output a first voltage and controls the fourth communication end to output a second voltage, and when the difference value between the first voltage and the second voltage is smaller than or equal to a preset voltage, the power supply circuit is switched to a first output state; and/or when the difference value between the first voltage and the second voltage is greater than a preset voltage, the power supply circuit is switched to a second output state, and a power supply positive output end and a power supply negative output end of the power supply circuit have a first output state and a second output state, wherein the power supply voltage output in the second output state is greater than the power supply voltage output in the first output state;
a first resistor coupled between the first communication terminal and the second communication terminal;
the detection module is used for detecting voltages at two ends of the first resistor, or the detection module is used for detecting currents on the first communication end and the second communication end, so that the voltage conversion module is controlled to output corresponding power supply voltage to the electric equipment according to the voltages or the currents.
2. The power supply circuit of claim 1,
the detection module is a four-port device, and further comprises a first output end and a second output end, wherein the first output end is connected to the voltage conversion module, and the second output end is connected to an original edge ground;
the first output end and the second output end have a first connection state of mutual disconnection and a second connection state of mutual connection according to voltage at two ends of the first resistor or current on the first communication end and the second communication end.
3. The power supply circuit of claim 2 wherein the four-port device is a photocoupler and the voltage conversion module is a primary side feedback switching power supply.
4. The power supply circuit of claim 3 wherein said primary side feedback switching power supply comprises a control chip, a transformer and a voltage feedback network;
the transformer comprises an output winding, an input winding and an auxiliary winding, wherein the input winding and the auxiliary winding are coupled with the output winding;
the voltage feedback network comprises a second resistor, a third resistor and a fourth resistor;
the feedback end of the control chip is connected with the first end of the auxiliary winding through the second resistor, and the second end of the auxiliary winding is connected with a primary side ground;
the feedback end of the control chip is also connected with a primary side ground through the third resistor;
and the feedback end of the control chip is also connected with the first output end of the photoelectric coupler through the fourth resistor.
5. The power supply circuit of claim 4 wherein said primary side feedback switching power supply further comprises a rectifier circuit and an electronic switch;
the rectifier circuit is provided with a positive power output end and a negative power output end, the negative power output end is connected with a primary side ground, the positive power output end is connected with the primary side ground through the input winding and the electronic switch, and the control end of the electronic switch is connected with the output end of the control chip.
6. The power supply circuit according to any one of claims 1-5, wherein the power supply interface type of the power supply circuit is a USB power supply interface, the power supply positive output terminal is VBUS of the USB charging interface, the power supply negative output terminal is GND of the USB charging interface, the first communication terminal is D + of the USB power supply interface, and the first communication terminal is D-of the USB power supply interface.
7. A power supply system is characterized by comprising a power adapter and a power utilization device, wherein the power adapter comprises a power supply circuit, and the power supply circuit comprises a voltage conversion module, a detection module and a first resistor;
the voltage conversion module comprises a power supply positive output end and a power supply negative output end, and the electric equipment is connected with the power supply positive output end and the power supply negative output end of the power supply circuit so as to supply power to the electric equipment through the power supply circuit;
the detection module is connected with the voltage conversion module and comprises a first communication end and a second communication end, and the first resistor is coupled between the first communication end and the second communication end;
the electric equipment comprises a regulating circuit, the electric equipment comprises a third communication end and a fourth communication end which are used as output ends, the third communication end is connected with the first communication end, the fourth communication end is connected with the second communication end, and the electric equipment controls the third communication end to output a first voltage and controls the fourth communication end to output a second voltage; when the difference value of the first voltage and the second voltage is smaller than or equal to a preset voltage, the power supply circuit is switched to a first output state; and/or when the difference value between the first voltage and the second voltage is greater than a preset voltage, the power supply circuit is switched to a second output state, and a power supply positive output end and a power supply negative output end of the power supply circuit have a first output state and a second output state, wherein the power supply voltage output in the second output state is greater than the power supply voltage output in the first output state; or the electric equipment controls the current, so that the power supply circuit controls the voltage conversion module to output the corresponding power supply voltage to the electric equipment according to the current.
8. The power supply system of claim 7 wherein said third communication terminal is connected to ground, said regulation circuit further comprising: the first electronic switch is connected with the fourth communication end and the power supply, and the electric equipment controls the difference value between the first voltage and the second voltage by controlling the on-off of the first electronic switch.
9. The power supply system of claim 7 wherein the fourth communication terminal is connected to ground, the regulation circuit further comprising: and the second electronic switch is connected with the third communication end and the power supply, and the electric equipment controls the difference value between the first voltage and the second voltage by controlling the on-off state of the second electronic switch.
10. The power supply system according to claim 7, wherein the regulation and control circuit further comprises a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the power supply, the other end of the fifth resistor is connected to the third communication terminal, one end of the sixth resistor is connected to the fourth communication terminal, and the other end of the sixth resistor is grounded; an on-off control switch is connected between the fifth resistor and the power supply in series, and/or an on-off control switch is connected between the sixth resistor and the ground in series, and the electric equipment controls the difference value between the first voltage and the second voltage by controlling the on-off of the on-off control switch.
11. The power supply system of claim 7 wherein the power supply positive output and the power supply negative output of the power supply circuit have a first output state and a second output state, wherein the second output state outputs a supply voltage that is greater than the supply voltage output by the first output state;
the electric equipment controls the third communication end to be in short circuit with the fourth communication end, and inputs current to the third communication end and the fourth communication end; when the current is smaller than or equal to a preset current, the power supply circuit is switched to a first output state, and/or when the current is larger than the preset current, the power supply circuit is switched to a second output state.
12. A power supply method applied to the power supply circuit according to any one of claims 1 to 6, the power supply method comprising the steps of:
the detection module acquires a measured value of the first resistance;
when the measured value is smaller than or equal to a preset value, the detection module controls the voltage conversion module to output a corresponding power supply voltage in a first output state; and/or the presence of a gas in the gas,
when the measured value is larger than a preset value, the detection module controls the voltage conversion module to output a corresponding power supply voltage in a second output state;
and the power supply voltage output in the second output state is greater than the power supply voltage output in the first output state.
13. The power supply method according to claim 12, wherein the measured value is a voltage value and/or a current value, the preset value is a preset voltage when the measured value is a voltage value across the first resistor, and the preset value is a preset current when the measured value is a current value flowing through the first resistor.
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