CN115441738B - Power converter, power adapter and electronic equipment - Google Patents

Power converter, power adapter and electronic equipment Download PDF

Info

Publication number
CN115441738B
CN115441738B CN202210955410.6A CN202210955410A CN115441738B CN 115441738 B CN115441738 B CN 115441738B CN 202210955410 A CN202210955410 A CN 202210955410A CN 115441738 B CN115441738 B CN 115441738B
Authority
CN
China
Prior art keywords
control circuit
side control
branch
power converter
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210955410.6A
Other languages
Chinese (zh)
Other versions
CN115441738A (en
Inventor
郭春明
张程龙
郑俊杰
滕谋艳
崔轸皓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huayuan Zhixin Semiconductor Shenzhen Co ltd
Original Assignee
Huayuan Zhixin Semiconductor Shenzhen Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huayuan Zhixin Semiconductor Shenzhen Co ltd filed Critical Huayuan Zhixin Semiconductor Shenzhen Co ltd
Publication of CN115441738A publication Critical patent/CN115441738A/en
Application granted granted Critical
Publication of CN115441738B publication Critical patent/CN115441738B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a power converter, a power adapter and an electronic device, wherein the power converter comprises a transformer, a first switching tube, an output capacitor, a primary side control circuit, a load detection circuit, a secondary side control circuit and a feedback circuit; and detecting a load signal of the output end of the power converter in real time by using a load detection circuit, judging whether the output end of the power converter is normally connected with portable equipment according to the load signal, and turning off the primary side control circuit and the secondary side control circuit to enter a zero power consumption mode under the condition that the output end of the power converter is not normally connected with the portable equipment. Thereby greatly reducing the internal power consumption of the output end of the power converter under no-load condition.

Description

Power converter, power adapter and electronic equipment
Technical Field
The present invention relates to the field of power supplies, and in particular, to a power converter, a power adapter, and an electronic device.
Background
Isolated power converters are commonly used in power adapters to provide power to battery powered portable devices.
The isolated power converter provides a regulated output for normal operation and battery charging when the portable device is coupled to the power adapter. However, in most use cases, the portable device is connected to the power adapter for only a short period of time during the day.
While the power adapter must maintain a regulated output even though the portable device is not coupled to the power adapter. Many times millions of idle power adapters are connected to the ac grid, rather than to the portable device. Power adapters generate internal power consumption by maintaining output regulation and waiting for coupling of portable devices, millions of idle power adapters result in significant energy waste.
To reduce internal power consumption, prior art power adapters operate in a skip mode. The skip mode operation uses a well known technique, pulse Frequency Modulation (PFM). In the case of a jump run, the power switches of the power converter circulate at a frequency that maintains a power balance of the power consumption inside the power adapter, so that the power adapter maintains proper output regulation. However, this approach still has a large internal power consumption since all primary and secondary side control functions must remain active to ensure output regulation even in the case of a portable device that is not coupled to a power adapter.
Disclosure of Invention
The invention provides a power converter, a power adapter and electronic equipment, which are used for solving the problem of high internal power consumption of the existing power converter.
According to a first aspect of the present invention, there is provided a power converter comprising: the device comprises a transformer, a first switching tube, an output capacitor, a primary side control circuit, a load detection circuit, a secondary side control circuit and a feedback circuit; wherein:
The transformer comprises a primary side winding and a secondary side winding, wherein a first end of the primary side winding is directly or indirectly connected with an input voltage to be converted, a second end of the primary side winding is connected to an input end of the first switching tube, and an output end of the first switching tube is grounded through a first resistor;
One end of the output capacitor is connected to the output end of the power converter, and the other end of the output capacitor is grounded;
The input end of the primary side control circuit receives a feedback signal output by the feedback circuit, and the output end of the primary side control circuit is connected with the control end of the first switching tube;
The load detection circuit is used for detecting a load signal of the output end of the power converter in real time and sending the detected load signal to the secondary side control circuit;
the secondary side control circuit is configured to: judging the load state of the output end of the power converter based on the load signal, and controlling the feedback circuit to send the feedback signal to the primary side control circuit based on the load state; wherein the load state at least comprises a normal connection state and an abnormal connection state; the normal connection state is used for representing that the output end of the power converter is normally connected with portable equipment, and the abnormal connection state is used for representing that the output end of the power converter is not normally connected with portable equipment; the feedback signals at least comprise a first feedback signal and a second feedback signal, wherein the first feedback signal is matched with the normal connection state, and the second feedback signal is matched with the abnormal connection state; the portable equipment is not normally connected to the output end of the power converter, and the portable equipment is not connected to the output end of the power converter or the output end of the power converter is in a light load state;
In the case that the load state is a normal connection state, the primary side control circuit and the secondary side control circuit normally operate;
and when the load state is an abnormal connection state, the primary side control circuit and the secondary side control circuit are closed, and a zero power consumption mode is entered.
In one embodiment of the present invention, the second feedback signal includes an enter zero power consumption signal and an exit zero power consumption signal, wherein the enter zero power consumption signal matches a transition of an output end of the power converter from a normal connection with a portable device to a disconnection from the portable device; the exit zero power consumption signal matches a transition from not having a normal connection with the portable device to a normal connection with the portable device at the output of the power converter.
In one embodiment of the present invention, after the primary side control circuit receives the enter zero power signal, the primary side control circuit enters a zero power mode after sending an acknowledge enter zero power signal to the secondary side control circuit; the secondary side control circuit enters a zero power consumption mode after receiving the confirmation to enter a zero power consumption signal.
In one embodiment of the present invention, after the primary side control circuit receives the exit zero power consumption signal, the primary side control circuit exits the zero power consumption mode after sending a confirmation exit zero power consumption signal to the secondary side control circuit, and enters normal operation; and the secondary side control circuit exits the zero power consumption mode after receiving the confirmation exit zero power consumption signal, and enters normal operation.
In one embodiment of the present invention, the load state further includes a low voltage state, in a case where the primary side control circuit and the secondary side control circuit are in a zero power consumption mode, the low voltage state being used to characterize that an output voltage of an output terminal of the power converter is lower than a preset voltage threshold;
the second feedback signal further comprises a low voltage feedback signal, the low voltage feedback signal being matched to the low voltage state;
when the load state is a low-voltage state, the secondary side control circuit controls the feedback circuit to send the low-voltage feedback signal to the primary side control circuit;
After receiving the low-voltage feedback signal, the primary side control circuit enters a switching mode from a zero-power consumption mode so as to enable the output voltage of the output end of the power converter to be recovered to a normal voltage value, and then enters the zero-power consumption mode again.
In one embodiment of the invention, the feedback circuit comprises a first branch, a second branch, a branch selection circuit and an optical isolation circuit; wherein:
the first branch and the second branch are connected in parallel between the output end of the power converter and the input end of the branch selection circuit;
The output end of the branch selection circuit is connected with the optical isolation circuit; the control end of the branch selection circuit is connected with the secondary side control circuit;
the secondary side control circuit controls the branch selection circuit to select the first branch or the second branch to be communicated with the optical isolation circuit based on the state signal;
Wherein the types of signals output to the optical isolation circuit by the first branch and the second branch are different; the optical isolation circuit sends the first feedback signal to the primary side control circuit under the condition that the first branch is communicated with the optical isolation circuit; the optical isolation circuit sends the second feedback signal to the primary side control circuit in the case where the second branch is in communication with the optical isolation circuit.
In one embodiment of the present invention, the first branch is an analog signal transmission branch, and the second branch is a digital signal transmission branch.
In one embodiment of the present invention, the first branch is a constant current source branch, and the second branch is a switching branch.
In one embodiment of the present invention, the branch selection circuit is a data selector, the first end of the first branch and the first end of the second branch are both connected to the output end of the power converter, and the second end of the first branch and the second end of the second branch are respectively connected to different data input ends of the data selector;
the output end of the data selector is connected with the optical isolation circuit; the control end of the data selector is connected with the secondary side control circuit.
In one embodiment of the present invention, the branch selection circuit includes a third switching device and a fourth switching device, wherein a first end of the first branch and a first end of the second branch are both connected to an output end of the power converter, a second end of the first branch is connected to an input end of the third switching device, and a second end of the second branch is connected to an input end of the fourth switching device;
The output end of the third switching device and the output end of the fourth switching device are both connected with the optical isolation circuit; and the control end of the third switching device and the control end of the fourth switching device are both connected with the secondary side control circuit.
In one embodiment of the invention, the feedback circuit includes a first branch and an optical isolation circuit; wherein:
A first end of the first branch is connected with the output end of the power converter, and a second end of the first branch is connected with the optical isolation circuit;
A switching device is arranged on the first branch, and the control end of the switching device is connected with the secondary side control circuit;
The secondary side control circuit controls the on-off of the switching device based on the state signal so that the first branch circuit generates different output signals to the optical isolation circuit, and the optical isolation circuit sends corresponding feedback signals to the primary side control circuit based on the output signals.
In one embodiment of the present invention, the optical isolation circuit includes: the light-emitting diode, the voltage stabilizing unit, the photosensitive element, the second resistor and the third resistor; wherein:
the positive electrode of the light-emitting diode is connected with the output end of the branch selection circuit, and the negative electrode of the light-emitting diode is connected with the first end of the voltage stabilizing unit;
the first end of the second resistor is connected with the output end of the power converter, the second end of the second resistor is connected with the first end of the third resistor, and the second end of the third resistor is grounded;
The control end of the voltage stabilizing unit is connected to the first end of the second resistor, and the second end of the voltage stabilizing unit is grounded;
The first end of the photosensitive element is grounded, and the second end of the photosensitive element is connected with the input end of the primary side control circuit;
The luminous intensity of the light emitting diode is proportional to the magnitude of the signal output by the output end of the branch selection circuit; the photosensitive element is used for receiving the light signals of the light emitting diode and converting the received light signals into electric signals, and the electric signals are fed back to the primary side control circuit.
In one embodiment of the present invention, the voltage stabilizing unit is a zener diode.
According to a second aspect of the present invention there is provided a power adapter comprising a power converter according to the first aspect of the present invention and optionally a power converter.
According to a third aspect of the present invention there is provided an electronic device comprising the power adapter of the second aspect of the present invention.
According to the power converter, the power adapter and the electronic equipment provided by the invention, the load signal of the output end of the power converter is detected in real time by the load detection circuit, whether the output end of the power converter is normally connected with the portable equipment is judged according to the load signal, and under the condition that the output end of the power converter is not normally connected with the portable equipment, the primary side control circuit and the secondary side control circuit are both closed to enter a zero-power consumption mode. Thereby greatly reducing the internal power consumption of the output end of the power converter under no-load condition.
In some preferred embodiments, the primary side control circuit receives the enter zero power consumption signal and/or the exit zero power consumption signal, and then performs switching of the working state after confirming the corresponding signals, so that synchronization of control of the primary side and the secondary side is ensured.
In some preferred embodiments, the feedback circuit includes two branches of different signal types, and the transmission of different types of feedback signals is controlled by the branches of the two different signal types, so that the load state of the output end of the power converter can be conveniently fed back, and the control is simplified.
In some preferred embodiments, in consideration of minor losses in the circuit, such as leakage of the output capacitor, the load state further includes a low voltage state indicating that the output voltage at the output of the power converter is below a preset voltage threshold when the primary side control circuit and the secondary side control circuit are in a zero power consumption mode; when the load state is a low-voltage state, the primary side control circuit is controlled to enter a switching mode from a zero-power consumption mode, so that the output voltage of the output end of the power converter is restored to a normal voltage value, and then the power converter enters the zero-power consumption mode again. Thereby maintaining regulation of the voltage at the output while reducing internal power consumption in an idle condition.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic topology of a power adapter;
FIG. 2 is a schematic diagram of a power converter according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a power converter according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a third configuration of a power converter according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a power converter according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a power converter according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a control flow of a power converter according to an embodiment of the invention;
FIG. 8 is a second control flow diagram of a power converter according to an embodiment of the invention;
fig. 9 is a control waveform diagram of a power converter according to an embodiment of the invention.
Reference numerals illustrate:
1-a primary side control circuit;
2-a load detection circuit;
3-a secondary side control circuit;
A 4-feedback circuit;
41-a first branch;
42-a second branch;
43-branch selection circuit;
44-light emitting diodes;
45-voltage stabilizing unit;
46-a photosensitive element;
5-a portable device;
6-an alternating current power supply;
7-rectifying unit;
cin-input side capacitance;
vin-input voltage;
np-primary side winding;
Ns primary side winding;
S1-a first switching tube;
R1-a first resistor;
V_FB-feedback voltage;
cout-output side capacitance;
a MUX-data selector;
SA-third switching device;
An SD-fourth switching device;
SAC-third switching device control signal;
SDC-fourth switching device control signal;
R F1 -a second resistor;
R F2 -fourth resistor;
Vout-output voltage.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present specification, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower surface", "upper surface", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present specification, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the description of the present invention, the meaning of "plurality" means a plurality, for example, two, three, four, etc., unless explicitly specified otherwise.
In the description of the present invention, unless explicitly stated and limited otherwise, the term "coupled" and the like should be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
With the development of technology, various types of electronic products are layered endlessly, and penetrate into the living aspects of people, and when the electronic products are used, the electronic products are required to be connected with the mains supply or to be pre-charged, and because the voltage of many electronic products is not matched with the mains supply, the terminal devices are required to be connected with the mains supply through a power adapter for charging.
As shown in fig. 1, one end of the power adapter is connected to a power grid, which is typically a power supply network of commercial power used by residents, and the other end is connected to a load, which may be various types of portable devices (terminal devices). Such as: cell phones, tablet computers, notebook computers, electronic wearable devices, electronic glasses, electric toothbrushes, dust collectors, electric bicycles and the like.
The internal components of the power adapter typically include an ac-dc conversion circuit, a power converter, and a filter circuit. The filter circuit is respectively connected with the power converter and the alternating current-direct current conversion circuit; the power converter is used for converting the direct current into a voltage range required by a load, and providing direct current voltage for the load; the filter circuit is used for filtering noise in the alternating current-direct current conversion circuit and the power converter.
The ac-dc conversion circuit and the filter circuit are not described in detail in the present application. The present application is only described with particular emphasis on power converters therein.
Many times, the power adapter is connected to the ac power grid, but not to the portable device; at this time, the power adapter waits for coupling of the portable device in order to maintain output adjustment, thereby generating a large amount of internal power consumption.
For this situation, the applicant has studied and analyzed the prior art, and found that the problem of internal power consumption cannot be solved in the prior art, because the existing power converter does not actively monitor the connection condition of the load at the output end of the power adapter, and even in the idle state (i.e. the power adapter is not connected with a portable device), the control functions of the primary side and the secondary side need to be kept active to ensure output regulation, thereby causing a large internal power consumption.
In view of the above, the embodiment of the invention provides a power converter to solve the problem that the internal power consumption of the power adapter is large in an idle state.
Referring to fig. 2-5, an embodiment of the present invention provides a power converter, including: a transformer, a first switching tube S1, an output capacitor Cout, a primary side control circuit 1, a load detection circuit 2, a secondary side control circuit 3, and a feedback circuit 4; wherein:
The transformer comprises a primary side winding Np and a secondary side winding Ns, wherein a first end of the primary side winding Np is directly or indirectly connected to an input voltage Vin to be converted, a second end of the primary side winding Np is connected to an input end of the first switching tube S1, and an output end of the first switching tube S1 is grounded through a first resistor R1;
one end of the output capacitor Cout is connected to the output end of the power converter, and the other end of the output capacitor Cout is grounded;
An input end of the primary side control circuit 1 receives a feedback signal from the feedback circuit 4; the output end of the primary side control circuit 1 is connected with the control end of the first switching tube S1 to control the first switching tube S1;
the load detection circuit 2 is configured to detect a load signal at an output end of the power converter in real time, and send the detected load signal to the secondary side control circuit 3; wherein the output voltage of the output of the power converter is denoted Vout, to which the portable device 5 is typically connected; the load signal generally includes a voltage across the portable device 5 and a current flowing through the portable device 5, and the magnitude of the load can be calculated according to the detected voltage and current;
The secondary side control circuit 3 is configured to: judging a load state of an output end of the power converter based on the load signal, and controlling the feedback circuit 4 to send the feedback signal to the primary side control circuit 1 based on the load state; wherein the load state at least comprises a normal connection state and an abnormal connection state; the normal connection state is used for representing that the output end of the power converter is normally connected with the portable equipment 5, and the abnormal connection state is used for representing that the output end of the power converter is not normally connected with the portable equipment 5; the feedback signals at least comprise a first feedback signal and a second feedback signal, wherein the first feedback signal is matched with the normal connection state, and the second feedback signal is matched with the abnormal connection state; wherein the output end of the power converter is not normally connected with the portable device 5, and the output end of the power converter is not connected with the portable device 5 or is in a light load state, wherein the light load state means that although the output end of the power converter is connected with the portable device 5, the current is small;
In the case where the load state is a normal connection state, the primary side control circuit 1 and the secondary side control circuit 3 normally operate; wherein normal operation means that the control functions of the primary side control circuit 1 and the secondary side control circuit 3 remain normal;
In the case that the load state is an abnormal connection state, the primary side control circuit 1 and the secondary side control circuit 3 are turned off, and enter a zero power consumption mode; in the zero power consumption mode, the control functions of the primary side control circuit 1 and the secondary side control circuit 3 are turned off, so that the circuit has no internal power consumption.
According to the power converter provided by the embodiment of the invention, the load detection circuit 2 is utilized to detect the load signal of the output end of the power converter in real time, whether the output end of the power converter is normally connected with the portable equipment 5 is judged according to the load signal, and under the condition that the output end of the power converter is not normally connected with the portable equipment 5, the primary side control circuit 1 and the secondary side control circuit 3 are closed, and a zero power consumption mode is entered. Thereby greatly reducing the internal power consumption of the output end of the power converter under no-load condition. The zero power consumption mode refers to that the control function is closed, and the circuit does not work any more.
In one embodiment of the invention, the second feedback signal comprises an enter zero power consumption signal and an exit zero power consumption signal, wherein the enter zero power consumption signal matches a transition of an output of the power converter from a connected portable device 5 to a disconnected portable device 5; the exit zero power consumption signal matches the transition of the output of the power converter from not having a normal connection with the portable device 5 to a normal connection with the portable device 5.
As a preferred embodiment, the communication between the primary side control circuit 1 and the secondary side control circuit 3 needs to be confirmed, which is embodied in: when the primary side control circuit 1 receives the zero power consumption entering signal, the primary side control circuit 1 needs to send a zero power consumption entering signal to the secondary side control circuit 3, and then enters a zero power consumption mode; the secondary side control circuit 3 enters a zero power consumption mode after receiving the acknowledge enter zero power consumption signal.
Specifically, as shown in fig. 7, if the portable device is normally connected to the output terminal of the current power converter, the secondary side control circuit 3 determines whether the output terminal of the power converter is separated from the portable device according to the load signal detected by the load detection circuit 2, and if not, the primary side control circuit 1 and the secondary side control circuit 3 both operate normally. If the separation occurs, the secondary side control circuit 3 controls the feedback circuit to send a zero power consumption entering signal to the primary side control circuit 1, the primary side control circuit 1 needs to confirm after receiving the zero power consumption entering signal, and if the primary side control circuit 1 is not confirmed, the secondary side control circuit 3 continues to control the feedback circuit to send the zero power consumption entering signal to the primary side control circuit 1; if the confirmation of the primary side control circuit 1 is received, the secondary side control circuit 3 enters the zero power consumption mode, and the primary side control circuit 1 also enters the zero power consumption mode after the confirmation.
Further, the confirmation of the need for communication between the primary side control circuit 1 and the secondary side control circuit 3 is also embodied in: when the primary side control circuit 1 receives the zero power consumption exit signal, the primary side control circuit 1 needs to send a zero power consumption exit confirmation signal to the secondary side control circuit 3, then exits from a zero power consumption mode and enters into normal operation; the secondary side control circuit 3 exits the zero power consumption mode after receiving the confirmation exit zero power consumption signal, and enters normal operation.
Specifically, as shown in fig. 8, if the portable device is not normally connected to the output terminal of the current power converter, the secondary side control circuit 3 determines whether the output terminal of the power converter is connected to the portable device according to the load signal detected by the load detection circuit 2, and if not, both the primary side control circuit 1 and the secondary side control circuit 3 maintain the zero power consumption mode. If the connection occurs, the secondary side control circuit 3 controls the feedback circuit to send a zero power consumption quitting signal to the primary side control circuit 1, the primary side control circuit 1 needs to confirm after receiving the zero power consumption quitting signal, and if the primary side control circuit 1 does not receive the confirmation, the secondary side control circuit 3 continues to control the feedback circuit to send the zero power consumption quitting signal to the primary side control circuit 1; if the confirmation of the primary side control circuit 1 is received, the secondary side control circuit 3 exits the zero power consumption mode, and the primary side control circuit 1 also exits the zero power consumption mode after the confirmation.
This way of communication of the primary side control circuit with the secondary side control circuit ensures synchronization of the control of the primary side and the secondary side.
In view of minor losses in the circuit, such as leakage of the output capacitor Cout, the load state also includes a low voltage state, which characterizes the output voltage Vout at the output of the power converter being below a preset voltage threshold, in the case of zero power consumption mode of the primary side control circuit 1 and of the secondary side control circuit 3; the second feedback signal further includes a low voltage feedback signal that matches the low voltage condition. When the load state is a low-voltage state, the secondary side control circuit 3 controls the feedback circuit 4 to send the low-voltage feedback signal to the primary side control circuit 1, controls the primary side control circuit 1 to enter a switch mode from a zero power consumption mode, so that the output voltage Vout of the output end of the power converter is restored to a normal voltage value, and then enters the zero power consumption mode again. Thereby maintaining regulation of the voltage at the output while reducing internal power consumption in an idle condition.
As an embodiment, the feedback circuit 4 includes a first branch 41, a second branch 42, a branch selection circuit 43, and an optical isolation circuit. Wherein the first branch 41 and the second branch 42 are connected in parallel between the output of the power converter and the input of the branch selection circuit 43; the output end of the branch selection circuit 43 is connected with the optical isolation circuit; the control end of the branch selection circuit 43 is connected with the secondary side control circuit 3; the secondary side control circuit 3 controls the branch selection circuit 43 to select the first branch 41 or the second branch 42 to communicate with the optical isolation circuit based on the status signal. Wherein the types of signals output by the first branch 41 and the second branch 42 to the optical isolation circuit are different; in the case where the first branch 41 communicates with the optical isolation circuit, the optical isolation circuit sends the first feedback signal to the primary-side control circuit 1; in case the second branch is in communication with the optical isolation circuit, the optical isolation circuit sends the second feedback signal to the primary side control circuit 1.
In one embodiment, as shown in fig. 2, the branch selection circuit 43 is a data selector MUX; the first end of the first branch 41 and the first end of the second branch 42 are both connected with the output end of the power converter, and the second end of the first branch 41 and the second end of the second branch 42 are respectively connected with different data input ends of the data selector MUX; different data inputs represent different channels of the data selector MUX; the output end of the data selector MUX is connected with the optical isolation circuit; the control terminal of the data selector MUX is connected to the secondary side control circuit 3. Specifically, the secondary side control circuit 3 controls the data selector MUX to control the different channel conduction of the data selector MUX, for example, the channel conduction to which the first branch 41 is connected or the channel conduction to which the second branch 42 is connected; thereby controlling the connection of the first branch 41 or the second branch 42 to the optical isolation circuit.
In another embodiment, as shown in fig. 3, the branch selection circuit 43 includes a third switching device SA and a fourth switching device SD, wherein the first end of the first branch 41 and the first end of the second branch 42 are both connected to the output end of the power converter, the second end of the first branch 41 is connected to the input end of the third switching device SA, and the second end of the second branch 42 is connected to the input end of the fourth switching device SD; the output end of the third switching device SA and the output end of the fourth switching device SD are both connected with the optical isolation circuit; the control end of the third switching device SA and the control end of the fourth switching device SD are both connected to the secondary side control circuit 3. The secondary side control circuit 3 controls the control signal SAC sent to the control terminal of the third switching device SA and the control signal SDC sent to the control terminal of the third switching device SA based on the status signal, so that the third switching device SA or the fourth switching device SD is turned on, thereby controlling the first branch 41 or the second branch 42 to be connected to the optical isolation circuit.
Of course, it should be appreciated that the branch selection circuit 43 is not limited to the data selector MUX or the switching tube, but may take other forms, and is within the scope of the present invention as long as the gating function for different branches can be implemented.
The first branch 41 may be, for example, an analog signal transmission branch, and the second branch 42 may be, for example, a digital signal transmission branch. As shown in fig. 4 and 5, as a specific embodiment, the first branch 41 is a constant current source branch, and specifically includes a constant current source. The second branch 42 is a switching branch, and specifically includes a switching tube.
When the second branch 42 switches the switching tube, the control terminal of the switching tube receives a control signal, which is preferably a control signal generated by the secondary side control circuit 3, to simplify the circuit structure. In this case, the secondary side control circuit 3 controls the branch selection circuit 43 to select whether the first branch 41 or the second branch 42 is connected to the optical isolation circuit according to the load state, and controls the on and off of the second branch 42 to form different types of digital signals to be transmitted to the optical isolation circuit.
Of course, the control signal of the control terminal of the switching tube constituting the second branch 42 may also be a control signal generated by an additional PWM control circuit. Various implementations of the control signal are within the scope of the invention.
Of course, it should be appreciated that the analog signal transmission branch of the present invention is not limited to a constant current source, and any circuit form for transmitting an analog signal is within the scope of the present invention, for example, the first branch 41 may also be formed of or include a resistor. Meanwhile, the digital signal transmission branch of the present invention is not limited to a switch, and any circuit form for transmitting a digital signal is within the scope of the present invention, for example, the second branch 42 may also be formed of a resistor or may also include a resistor.
In the prior art, the feedback signal is generally only an analog signal, so that the state represented by the feedback signal is very limited. The invention controls the transmission of different types of feedback signals through the branches of two different signal types, thereby conveniently feeding back the load state of the output end of the power converter and simplifying the control. And, since the digital signal can realize various different changes, various different state information feedback can be performed, such as a transition state from a normal connection of the portable device to a disconnection of the portable device at the output end of the power converter, a transition state from an abnormal connection of the portable device to a normal connection of the portable device at the output end of the power converter, a low voltage state, and the like. And the implementation types of the digital signals have diversified choices, for example, different pulse widths, pulse amplitudes, pulse numbers and the like can represent different digital signals.
Of course, the above feedback circuit is only an example, and the feedback circuit in the present invention may also take other forms, as long as different load states of the output end of the power converter can be fed back. Specifically, as another example, the feedback circuit may further include a first branch and an optical isolation circuit; wherein:
A first end of the first branch is connected with the output end of the power converter, and a second end of the first branch is connected with the optical isolation circuit;
A switching device is arranged on the first branch, and the control end of the switching device is connected with the secondary side control circuit;
The secondary side control circuit controls the on-off of the switching device based on the state signal so that the first branch circuit generates different output signals to the optical isolation circuit, and the optical isolation circuit sends corresponding feedback signals to the primary side control circuit based on the output signals. For example, the secondary side control circuit controls the on-off of the switching device based on the state signal, so that the first branch circuit generates output signals with different pulse widths, pulse amplitudes, pulse numbers and the like, and the output signals are fed back to the primary side control circuit through the optical isolation circuit.
As a specific embodiment, the optical isolation circuit includes: the light emitting diode 44, the voltage stabilizing unit 45, the photosensitive element 46, the second resistor R F1 and the third resistor R F2; wherein:
The positive electrode of the light emitting diode 44 is connected with the output end of the branch selection circuit 43, and the negative electrode thereof is connected with the first end of the voltage stabilizing unit 45;
The first end of the second resistor R F1 is connected with the output end of the power converter, the second end of the second resistor R F1 is connected with the first end of the third resistor R F2, and the second end of the third resistor R F2 is grounded;
The control end of the voltage stabilizing unit 45 is connected to the first end of the second resistor R F2, and the second end of the voltage stabilizing unit 45 is grounded; the second resistor R F1 and the third resistor R F2 form a voltage dividing network to control the control end of the voltage stabilizing unit 45;
The first end of the photosensitive element 46 is grounded, and the second end of the photosensitive element is connected with the input end of the primary side control circuit 1;
the luminous intensity of the light emitting diode 44 is proportional to the magnitude of the signal output from the output terminal of the branch selection circuit 43; the photosensitive element 46 is configured to receive the light signal of the light emitting diode 44 and convert the received light signal into an electrical signal, and feed back the electrical signal to the primary side control circuit 1.
As a specific embodiment, the voltage stabilizing unit 45 may be, for example, a zener diode; of course, the invention is not limited thereto, and other types of voltage stabilizing units are also within the scope of the invention.
Specifically, for example, the light emitting diode 44 receives a signal, such as a voltage signal, output by the first branch 41 or the second branch 42; and emits light under the action of the received signal, the intensity of the emitted light being proportional to the magnitude of the received signal. The photosensor 46 converts the light signal from the led 44 into an electrical signal and processes the electrical signal to send a feedback signal to the primary side control circuit 1, for example, a voltage signal v_fb to the primary side control circuit 1.
Referring to fig. 9, referring to the control waveforms of the power converter provided by the embodiment of the present invention, in fig. 9, the connection situation of the portable device refers to the connection situation of the output end of the power converter and the portable device, where the connection situation includes: connection, disconnection, transition to connect to disconnect, transition to disconnect. Vout represents the detected output voltage at the output of the power converter, v_opto represents the signal output by the output of the branch selection circuit 43 received by the light emitting diode 44, which may be, for example, an output voltage, specifically, v_opto and v_fb in a connected state are analog voltages and in a non-connected state are digital voltages, wherein the emphasis is given to the case of digital signals in fig. 9, that is, the case of separation of the portable device from the output of the power converter, transition from connection to separation, and transition from separation to connection. V_fb represents a feedback signal transmitted from the photosensor 46 to the primary-side control circuit 1.
In the case where the portable device is stably connected to the output of the power converter, the analog signal received by the led 44 and output for the first branch 41 is a common feedback mode, which is not specifically shown in fig. 9. Fig. 9 focuses on illustrating the control manner of the digital signal. As shown in fig. 9, in the case where the output terminal of the power converter is separated from the portable device, the secondary side control circuit 3 controls the second branch 42 to be connected to the light emitting diode 44, specifically:
When the output of the power converter and the portable device are transitioned from being connected to a separate, the second branch 42 sends two narrow pulse wave signals to the light emitting diode 44, which are representative of the incoming zero power consumption signal; the photosensitive element 46 analyzes a corresponding electrical signal according to the light emitting condition of the light emitting diode 44, and sends a feedback signal v_fb to the primary side control circuit 1, and the primary side control circuit 1 confirms after receiving the enter zero power consumption signal, for example, also feeds back confirmation that two narrow pulse waves represent enter the zero power consumption mode, the primary side control circuit 1 enters the zero power consumption mode after sending out the confirmation signal, and the secondary side control circuit 3 also enters the zero power consumption mode after receiving the confirmation signal of the primary side control circuit 1.
In the zero power consumption mode state, if the load detection circuit 2 detects that the output voltage Vout at the output terminal of the power converter is lower than a threshold v_t, as shown in part a of fig. 9; the second branch 42 sends a broad pulse wave signal to the led 44, the two narrow pulse wave signals representing the low voltage condition; the photosensitive element 46 analyzes a corresponding electric signal according to the light emitting condition of the light emitting diode 44, and sends a feedback signal v_fb to the primary side control circuit 1, and the primary side control circuit 1 enters a switching mode after receiving the wide pulse wave signal, so as to restore Vout to a normal value. Based on this regulation function for the output voltage Vout, the output voltage Vout is thereby always kept within a normal range, and thus output regulation is always maintained.
When the output of the power converter and the portable device are transitioned from split to connected, the second leg 42 sends three narrow pulse wave signals to the light emitting diode 44, which represent the exit zero power consumption signal; the photosensitive element 46 analyzes a corresponding electrical signal according to the light emitting condition of the light emitting diode 44, and sends a feedback signal v_fb to the primary side control circuit 1, and the primary side control circuit 1 confirms after receiving the zero power consumption exit signal, for example, also feeds back three narrow pulse waves representing zero power consumption exit mode confirmation, the primary side control circuit 1 exits the zero power consumption mode after sending out the confirmation signal, and the secondary side control circuit 3 also exits the zero power consumption mode after receiving the confirmation signal of the primary side control circuit 1.
Of course, fig. 9 is only an example, and the digital signal interaction between the primary side control circuit 1 and the secondary side control circuit 3 may also take other signal forms, such as other pulse widths, pulse amplitudes, pulse numbers, etc. to represent different digital signals.
In addition, the embodiment of the invention also provides a power adapter, as shown in fig. 6, which comprises an alternating current-direct current conversion circuit 7 and a filter circuit besides the power converter shown in fig. 5. The ac/dc conversion circuit 7 is a rectifier circuit formed of, for example, a diode, and the filter circuit is, for example, an input capacitor Cin. The ac-dc conversion circuit 7 is connected to the power grid 6 for converting ac power in the power grid 6 into dc power, and the input capacitor Cin is used for filtering noise in the ac-dc conversion circuit 7 and the power converter. And the secondary side of the power converter further comprises an output diode Dout.
In addition, the embodiment of the invention provides electronic equipment, which comprises the power adapter in the previous embodiment of the invention and corresponding portable equipment. The power adapter and the portable device can form a complete set of electronic equipment, and of course, the power adapter can also be independent of the corresponding portable device and become an independent product.
In the description of the present specification, the descriptions of the terms "one embodiment," "an embodiment," "a particular implementation," "an example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (14)

1. A power converter, comprising: the device comprises a transformer, a first switching tube, an output capacitor, a primary side control circuit, a load detection circuit, a secondary side control circuit and a feedback circuit; wherein:
The transformer comprises a primary side winding and a secondary side winding, wherein a first end of the primary side winding is directly or indirectly connected with an input voltage to be converted, a second end of the primary side winding is connected to an input end of the first switching tube, and an output end of the first switching tube is grounded through a first resistor;
One end of the output capacitor is connected to the output end of the power converter, and the other end of the output capacitor is grounded;
The input end of the primary side control circuit receives a feedback signal output by the feedback circuit, and the output end of the primary side control circuit is connected with the control end of the first switching tube;
The load detection circuit is used for detecting a load signal of the output end of the power converter in real time and sending the detected load signal to the secondary side control circuit;
the secondary side control circuit is configured to: judging the load state of the output end of the power converter based on the load signal, and controlling the feedback circuit to send the feedback signal to the primary side control circuit based on the load state; wherein the load state at least comprises a normal connection state and an abnormal connection state; the normal connection state is used for representing that the output end of the power converter is normally connected with portable equipment, and the abnormal connection state is used for representing that the output end of the power converter is not normally connected with portable equipment; the feedback signals at least comprise a first feedback signal and a second feedback signal, wherein the first feedback signal is matched with the normal connection state, and the second feedback signal is matched with the abnormal connection state; the portable equipment is not normally connected to the output end of the power converter, and the portable equipment is not connected to the output end of the power converter or the output end of the power converter is in a light load state;
In the case that the load state is a normal connection state, the primary side control circuit and the secondary side control circuit normally operate;
when the load state is an abnormal connection state, the primary side control circuit and the secondary side control circuit are closed, and a zero power consumption mode is entered;
The second feedback signal comprises an entering zero power consumption signal and an exiting zero power consumption signal, wherein the entering zero power consumption signal is matched with the transition from normal connection of the portable equipment to separation from the portable equipment at the output end of the power converter; the exit zero power consumption signal matches a transition from not having a normal connection with the portable device to a normal connection with the portable device at the output of the power converter.
2. The power converter of claim 1, wherein said primary side control circuit enters a zero power mode after sending an acknowledge enter zero power signal to said secondary side control circuit after said primary side control circuit receives said enter zero power signal; the secondary side control circuit enters a zero power consumption mode after receiving the confirmation to enter a zero power consumption signal.
3. The power converter of claim 1, wherein said primary side control circuit exits zero power consumption mode after sending an acknowledge exit zero power consumption signal to said secondary side control circuit to enter normal operation after said primary side control circuit receives said exit zero power consumption signal; and the secondary side control circuit exits the zero power consumption mode after receiving the confirmation exit zero power consumption signal, and enters normal operation.
4. The power converter of claim 1, wherein the load state further comprises a low voltage state, with the primary side control circuit and the secondary side control circuit in a zero power consumption mode, for characterizing an output voltage at an output of the power converter as being below a preset voltage threshold;
the second feedback signal further comprises a low voltage feedback signal, the low voltage feedback signal being matched to the low voltage state;
when the load state is a low-voltage state, the secondary side control circuit controls the feedback circuit to send the low-voltage feedback signal to the primary side control circuit;
After receiving the low-voltage feedback signal, the primary side control circuit enters a switching mode from a zero-power consumption mode so as to enable the output voltage of the output end of the power converter to be recovered to a normal voltage value, and then enters the zero-power consumption mode again.
5. The power converter of claim 4, wherein the feedback circuit comprises a first leg, a second leg, a leg selection circuit, and an optical isolation circuit; wherein:
the first branch and the second branch are connected in parallel between the output end of the power converter and the input end of the branch selection circuit;
The output end of the branch selection circuit is connected with the optical isolation circuit; the control end of the branch selection circuit is connected with the secondary side control circuit;
The secondary side control circuit controls the branch selection circuit to select the first branch or the second branch to be communicated with the optical isolation circuit based on a state signal;
Wherein the types of signals output to the optical isolation circuit by the first branch and the second branch are different; the optical isolation circuit sends the first feedback signal to the primary side control circuit under the condition that the first branch is communicated with the optical isolation circuit; the optical isolation circuit sends the second feedback signal to the primary side control circuit in the case where the second branch is in communication with the optical isolation circuit.
6. The power converter of claim 5, wherein the first branch is an analog signal transmission branch and the second branch is a digital signal transmission branch.
7. The power converter of claim 6, wherein the first leg is a constant current source leg and the second leg is a switching leg.
8. The power converter of claim 5, wherein the branch selection circuit is a data selector, a first end of the first branch and a first end of the second branch are both connected to an output end of the power converter, and a second end of the first branch and a second end of the second branch are respectively connected to different data input ends of the data selector;
the output end of the data selector is connected with the optical isolation circuit; the control end of the data selector is connected with the secondary side control circuit.
9. The power converter of claim 5, wherein the branch selection circuit comprises a third switching device and a fourth switching device, wherein a first end of the first branch and a first end of the second branch are both connected to the output of the power converter, a second end of the first branch is connected to the input of the third switching device, and a second end of the second branch is connected to the input of the fourth switching device;
The output end of the third switching device and the output end of the fourth switching device are both connected with the optical isolation circuit; and the control end of the third switching device and the control end of the fourth switching device are both connected with the secondary side control circuit.
10. The power converter of claim 4, wherein the feedback circuit comprises a first branch and an optical isolation circuit; wherein:
A first end of the first branch is connected with the output end of the power converter, and a second end of the first branch is connected with the optical isolation circuit;
A switching device is arranged on the first branch, and the control end of the switching device is connected with the secondary side control circuit;
The secondary side control circuit controls the on-off of the switching device based on a state signal so that the first branch circuit generates different output signals to the optical isolation circuit, and the optical isolation circuit sends corresponding feedback signals to the primary side control circuit based on the output signals.
11. The power converter of any of claims 5-9, wherein the optical isolation circuit comprises: the light-emitting diode, the voltage stabilizing unit, the photosensitive element, the second resistor and the third resistor; wherein:
the positive electrode of the light-emitting diode is connected with the output end of the branch selection circuit, and the negative electrode of the light-emitting diode is connected with the first end of the voltage stabilizing unit;
the first end of the second resistor is connected with the output end of the power converter, the second end of the second resistor is connected with the first end of the third resistor, and the second end of the third resistor is grounded;
The control end of the voltage stabilizing unit is connected to the first end of the second resistor, and the second end of the voltage stabilizing unit is grounded;
The first end of the photosensitive element is grounded, and the second end of the photosensitive element is connected with the input end of the primary side control circuit;
The luminous intensity of the light emitting diode is proportional to the magnitude of the signal output by the output end of the branch selection circuit; the photosensitive element is used for receiving the light signals of the light emitting diode and converting the received light signals into electric signals, and the electric signals are fed back to the primary side control circuit.
12. The power converter of claim 11, wherein the voltage stabilizing unit is a zener diode.
13. A power adapter comprising the power converter of any one of claims 1 to 12.
14. An electronic device comprising the power adapter of claim 13.
CN202210955410.6A 2022-04-08 2022-08-10 Power converter, power adapter and electronic equipment Active CN115441738B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210368394 2022-04-08
CN2022103683940 2022-04-08

Publications (2)

Publication Number Publication Date
CN115441738A CN115441738A (en) 2022-12-06
CN115441738B true CN115441738B (en) 2024-05-28

Family

ID=84242019

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210955410.6A Active CN115441738B (en) 2022-04-08 2022-08-10 Power converter, power adapter and electronic equipment

Country Status (1)

Country Link
CN (1) CN115441738B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002300779A (en) * 2001-03-29 2002-10-11 Sharp Corp Switching power supply device
JP2006158042A (en) * 2004-11-26 2006-06-15 Tdk Corp Switching power supply
DE202010002361U1 (en) * 2010-02-15 2010-05-20 Shenzhen LVSUN Electronic Technology Co., Ltd., Baoan Power saving smart power adapter
KR101188041B1 (en) * 2011-04-11 2012-10-05 삼성전기주식회사 Switching mode power supply
CN105244981A (en) * 2015-11-20 2016-01-13 深圳市祝你快乐科技有限公司 Energy saving charger capable of automatic power cutoff
CN105576766A (en) * 2016-02-18 2016-05-11 矽力杰半导体技术(杭州)有限公司 Automatic load detection circuit and mobile power supply applying the circuit
CN211656009U (en) * 2019-09-27 2020-10-09 深圳市芯茂微电子有限公司 Control device and chip of switching power supply and switching power supply
CN212677084U (en) * 2020-04-10 2021-03-09 杭州士兰微电子股份有限公司 Flyback converter and control circuit thereof
CN113054854A (en) * 2021-03-31 2021-06-29 华为技术有限公司 Power conversion circuit and adapter
CN113708635A (en) * 2021-03-16 2021-11-26 广州金升阳科技有限公司 Switching method and control device of flyback converter

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002300779A (en) * 2001-03-29 2002-10-11 Sharp Corp Switching power supply device
JP2006158042A (en) * 2004-11-26 2006-06-15 Tdk Corp Switching power supply
DE202010002361U1 (en) * 2010-02-15 2010-05-20 Shenzhen LVSUN Electronic Technology Co., Ltd., Baoan Power saving smart power adapter
KR101188041B1 (en) * 2011-04-11 2012-10-05 삼성전기주식회사 Switching mode power supply
CN105244981A (en) * 2015-11-20 2016-01-13 深圳市祝你快乐科技有限公司 Energy saving charger capable of automatic power cutoff
CN105576766A (en) * 2016-02-18 2016-05-11 矽力杰半导体技术(杭州)有限公司 Automatic load detection circuit and mobile power supply applying the circuit
CN211656009U (en) * 2019-09-27 2020-10-09 深圳市芯茂微电子有限公司 Control device and chip of switching power supply and switching power supply
CN212677084U (en) * 2020-04-10 2021-03-09 杭州士兰微电子股份有限公司 Flyback converter and control circuit thereof
CN113708635A (en) * 2021-03-16 2021-11-26 广州金升阳科技有限公司 Switching method and control device of flyback converter
CN113054854A (en) * 2021-03-31 2021-06-29 华为技术有限公司 Power conversion circuit and adapter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
一种低功耗反激变换器的设计;程红丽，等;《电力电子技术》;20180520;第52卷(第5期);第1-4页 *

Also Published As

Publication number Publication date
CN115441738A (en) 2022-12-06

Similar Documents

Publication Publication Date Title
US5781422A (en) Uninterruptible power supply with AC and DC power inputs
KR101822067B1 (en) Led emitting device
US5414610A (en) Universal power converter with single, shared power transformation circuit
US20050168189A1 (en) Power supply unit
CN102130608B (en) Power supply device and method for adjusting power supply device
JP2917871B2 (en) Uninterruptible switching regulator
WO2015119382A1 (en) Standby power saving circuit
US8502420B1 (en) Power supply architecture for controlling and monitoring isolated output modules
CN105515418A (en) PFC shutdown circuit for light load
EP0792007A3 (en) Universal power module
CN109904913B (en) Charging equipment and quick charging circuit thereof
KR20150083039A (en) Cable compensation by zero-crossing compensation current and resistor
US20090009153A1 (en) Multiple output ac/dc power adapter
CN115441738B (en) Power converter, power adapter and electronic equipment
US11527962B2 (en) Power adapter having ultra low standby power
CN111525676B (en) DC output uninterrupted power supply
CN217486369U (en) Control circuit and power supply circuit
KR100661470B1 (en) Un-interrupted Switching Mode Power Supply
TWI739064B (en) Uninterruptible power supply with dc output
CN221305762U (en) Isolation type switch power supply and switch power supply system
CN114172377B (en) Power converter with voltage output modulation
CN220915154U (en) Power supply converter
CN218514279U (en) Switching power supply and alternating current-direct current conversion circuit
CN110460450B (en) Switch supporting low-voltage wired networking
CN117996928B (en) Multi-port output charger and control method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant