CN111585457B - Power adapter and electronic equipment - Google Patents

Power adapter and electronic equipment Download PDF

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Publication number
CN111585457B
CN111585457B CN202010393363.1A CN202010393363A CN111585457B CN 111585457 B CN111585457 B CN 111585457B CN 202010393363 A CN202010393363 A CN 202010393363A CN 111585457 B CN111585457 B CN 111585457B
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circuit
output
voltage
output end
transistor
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CN202010393363.1A
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CN111585457A (en
Inventor
朱朝军
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Xi'an New Moore Semiconductor Co ltd
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Xi'an New Moore Semiconductor Co ltd
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    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H02M1/0035—Control circuits allowing low power mode operation, e.g. in standby mode using burst mode control
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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

Abstract

The application discloses power adapter and electronic equipment, including rectifier bridge circuit, discharge control circuit, vary voltage circuit and output control circuit. The output control circuit comprises a shaping filter circuit and a dummy load circuit, and the dummy load circuit comprises a switch circuit and a current detection circuit. The current detection circuit controls the switch circuit connected between the two output ends of the power adapter to be switched off or switched on according to the detected current or no current at the output end of the voltage transformation circuit, so that the voltage is maintained by the switched-on switch circuit when the power adapter is in no-load, and the electric energy loss of the power adapter during loading is further reduced.

Description

Power adapter and electronic equipment
Technical Field
The application relates to the technical field of electronics, in particular to a power adapter and electronic equipment.
Background
With the rapid development of electronic information technology, the types of electronic devices, such as mobile phones, palm computers, and notebook computers, are increasing, and generally, the voltage of an ac power supply is converted into a dc voltage by a power adapter to directly supply power to or charge the electronic devices. The power adapter generally comprises an outer shell, a rectifying circuit, a transformer, a voltage stabilizer and other electronic elements. Generally, in the daily use of a power adapter, even if a load (for example, a mobile communication device or the like) is not connected to the power adapter, the power adapter is plugged into an ac power supply for a long time so as to be used whenever plugged, and therefore, how to reduce the power consumption of the power adapter is a technical problem that people are always considering and solving.
Disclosure of Invention
The invention provides a power adapter and electronic equipment, which aim to solve the problem of electric energy loss of the power adapter in the prior art.
According to a first aspect, a power adapter comprises:
the rectifier bridge circuit is used for converting alternating current output by the power supply into direct current;
the discharge control circuit is used for converting the direct current output by the rectifier bridge circuit into high-voltage high-frequency alternating current;
the voltage transformation circuit comprises a positive input end, a negative input end, a positive output end and a negative output end, wherein the positive input end and the negative input end are connected with the discharge control circuit; the voltage transformation circuit is used for converting the high-voltage high-frequency alternating current into low-voltage high-frequency alternating current;
the output control circuit comprises a first connecting end, a second connecting end, a positive voltage output end and a negative voltage output end, wherein the first connecting end and the second connecting end are respectively connected with the positive output end and the negative output end of the voltage transformation circuit, and the positive voltage output end and the negative voltage output end are respectively used as the positive power supply output end and the negative power supply output end of the power adapter; the output control circuit is used for converting the low-voltage high-frequency alternating current into direct current to be used as the output of the power adapter;
the output control circuit comprises a shaping filter circuit and a dummy load circuit; the shaping filter circuit is used for converting the low-voltage high-frequency alternating current into direct current; the dummy load circuit is used for maintaining the voltage of the direct current output by the output control circuit when the power adapter is in no-load;
the dummy load circuit comprises a current detection circuit and a switch circuit, wherein the current detection circuit is connected with the positive output end or the negative output end of the transformation circuit and is used for detecting the current of the positive output end or the negative output end of the transformation circuit so as to control the switch circuit to be switched off or switched on according to the existence or nonexistence of the current of the positive output end or the negative output end of the transformation circuit; the switch circuit is connected between the positive voltage output end and the negative voltage output end of the output control circuit, and the switch circuit is used for conducting when the power adapter is in no-load so as to maintain the voltage of the direct current output by the output control circuit.
Further, the switching circuit includes a first switching transistor Q0; a first pole of the first switching transistor Q0 is connected to the positive voltage output terminal, a control pole of the first switching transistor Q0 is connected to the current detection circuit, and a second pole of the first switching transistor Q0 is connected to the negative voltage output terminal.
Further, the switching circuit further comprises a load resistor R0;
the load resistor R0 is connected between the first pole of the first switching transistor Q0 and the positive voltage output terminal;
or, the load resistor R0 is connected between the second pole of the first switching transistor Q0 and the negative voltage output terminal.
Further, the shaping filter circuit comprises a power chip, a resistor R1 and a capacitor C1; the power supply chip comprises a power supply output end VCC, a power supply grounding end GND and a power supply control end D, and is used for converting the low-voltage high-frequency alternating current output by the voltage transformation circuit into direct current; the power supply output end VCC is connected with the first connecting end and the positive voltage output end, the power supply control end D is connected with the second connecting end, and the power supply ground end GND is connected with the negative voltage output end; after the resistor R1 and the capacitor C1 are connected in series, one end of the resistor R is connected with the power supply control end D, and the other end of the resistor R is connected with the power supply grounding end GND.
Further, the shaping filter circuit further comprises a capacitor C2, one end of the capacitor C2 is connected with the power ground GND, and the other end of the capacitor C2 is connected with the power output terminal VCC.
Further, the power supply chip comprises a control unit, a driving unit, a control diode D1 and a second transistor Q1; the control unit is configured to output an enable control signal to the driving unit, the driving unit outputs a driving control signal to the second transistor Q1 in response to the enable control signal, and the second transistor Q1 is turned on or off in response to the driving control signal; the control end of the second transistor Q1 is connected with the driving unit, and the first pole and the second pole of the transistor Q1 are connected between the power supply control end D and the power supply ground end GND; the control diode D1 is connected in series between the power control terminal D and the power ground terminal GND.
Further, the current detection circuit is connected with the power supply control end D; the current detection circuit judges whether the positive output end or the negative output end of the transformation circuit has or does not have current by detecting the current between the first pole and the second pole of the second transistor Q1, and/or the current detection circuit judges whether the positive output end or the negative output end of the transformation circuit has or does not have current according to the switching period of the second transistor Q1.
Further, the discharge control circuit comprises a first diode D21, a second diode D22, a third transistor Q21, a resistor R21, a capacitor C21 and a pulse modulation controller; a control electrode of the third transistor Q21 is connected to the pulse modulation controller, a second electrode of the third transistor Q21 is connected to the rectifier bridge circuit, and a first electrode of the third transistor Q21 is connected to the negative input terminal of the transformer circuit; an anode of the first diode D21 is connected to a first electrode of the third transistor Q21 and grounded, and a cathode of the first diode D21 is connected to a second electrode of the third transistor Q21; an anode of the second diode D22 is connected to a second pole of the third transistor Q21; after the resistor R21 and the capacitor C21 are connected in parallel, one end of the resistor R is connected with the positive input end of the voltage transformation circuit, and the other end of the resistor R is connected with the negative electrode of the second diode D22.
Further, the discharge control circuit further includes a capacitor C22 connected in series between the positive input terminal of the transformer circuit and ground.
According to a second aspect, an electronic device comprises the power adapter of the first aspect.
According to the embodiment, the power adapter and the electronic device comprise the rectifier bridge circuit, the discharge control circuit, the transformation circuit and the output control circuit. The output control circuit comprises a shaping filter circuit and a dummy load circuit, and the dummy load circuit comprises a switch circuit and a current detection circuit. The current detection circuit controls the switch circuit connected between the two output ends of the power adapter to be switched off or switched on according to the detected presence or absence of the current at the output end of the voltage transformation circuit, so that the voltage is maintained through the switched-on switch circuit when the power adapter is in no-load, and the electric energy loss of the power adapter during loading is further reduced.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a power adapter;
FIG. 2 is a schematic diagram of the electrical connections of the power adapter in one embodiment;
FIG. 3 is a schematic diagram of a power chip circuit connection of the output control circuit in one embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments have been given like element numbers associated therewith. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the described features, operations, or characteristics may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the description of the methods may be transposed or transposed in order, as will be apparent to a person skilled in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified.
As shown in fig. 1, a schematic circuit structure of a power adapter includes a rectifying circuit 10, a discharge control circuit 20, a voltage transformation output circuit 30, and an output control circuit 40. The rectification circuit 10 is used for being connected with an alternating current power supply to convert alternating current output by the alternating current power supply into direct current to be output, the discharge control circuit 20 is used for controlling the direct current output by the rectification circuit 10 to be output to the transformation circuit 30 through the pulse modulation controller, the transformation circuit 30 is used for reducing the voltage of the direct current output by the rectification circuit 10, and the output control circuit 40 is used for shaping, filtering and outputting the reduced direct current. The output control circuit 40 includes a rectifying circuit 42 and a dummy load circuit 41, the dummy load circuit 41 is used for stabilizing the dc voltage output by the output control circuit 40, and the rectifying circuit 42 is used for shaping, filtering and outputting the dc voltage after voltage reduction. In one example, the dummy load circuit 41 employs a load resistor R0 connected in series between two output terminals of the power adapter, so that the load resistor R0 always consumes power regardless of whether the power adapter is connected to a load, which in turn increases power consumption of the power adapter under load.
In one embodiment of the present application, a power adapter is provided, which includes a rectifier bridge circuit, a discharge control circuit, a voltage transformation circuit, and an output control circuit. The output control circuit comprises a shaping filter circuit and a dummy load circuit, and the dummy load circuit comprises a switch circuit and a current detection circuit. The current detection circuit controls the switch circuit connected between the two output ends of the power adapter to be switched off or switched on according to the detected current or no current at the output end of the voltage transformation circuit, so that the voltage is maintained by the switched-on switch circuit when the power adapter is in no-load, and the electric energy loss of the power adapter during loading is further reduced.
Example one
Referring to fig. 2, a schematic circuit connection diagram of a power adapter in an embodiment includes a rectifier bridge circuit 10, a discharge control circuit 20, a transformer circuit 30, and an output control circuit 40. The rectifier bridge circuit 10 is used for converting alternating current output by a power supply into direct current, the discharge control circuit 20 is used for converting the direct current output by the rectifier bridge circuit 10 into high-voltage high-frequency alternating current, the voltage transformation circuit 30 comprises a positive input end, a negative input end, a positive output end and a negative output end, the positive input end and the negative input end are connected with the discharge control circuit 20, the voltage transformation circuit 30 is used for converting the high-voltage high-frequency alternating current into low-voltage high-frequency alternating current, the output control circuit 40 comprises a first connecting end, a second connecting end, a positive voltage output end and a negative voltage output end, the first connecting end and the second connecting end are respectively connected with the positive output end and the negative output end of the voltage transformation circuit 30, the positive voltage output end and the negative voltage output end are respectively used as a positive power supply output end and a negative power supply output end of a power supply adapter, and the output control circuit 40 is used for converting the low-voltage high-frequency alternating current into direct current to be used as output of the power supply adapter. The output control circuit 40 includes a shaping filter circuit 42 and a dummy load circuit 41, the shaping filter circuit 42 is used for converting low-voltage high-frequency alternating current into direct current, and the dummy load circuit 41 is used for maintaining the voltage of the direct current output by the output control circuit 40 when the power adapter is idle. The dummy load circuit 41 includes a current detection circuit 512 and a switch circuit 511, wherein the current detection circuit 512 is connected to the positive output terminal or the negative output terminal of the transformer circuit 30, and is used for detecting the current at the positive output terminal or the negative output terminal of the transformer circuit 30, so as to control the switch circuit 511 to be turned off or turned on according to the presence or absence of the current at the positive output terminal or the negative output terminal of the transformer circuit 30. The switch circuit 511 is connected between the positive voltage output terminal and the negative voltage output terminal of the output control circuit 40, and the switch circuit 511 is used for turning on the power adapter during no-load to maintain the voltage of the direct current output by the output control circuit.
In one embodiment, the transformer circuit 30 includes a transformer including a primary positive input terminal, a primary negative input terminal, a secondary positive output terminal, and a secondary negative output terminal, the primary positive input terminal and the primary negative input terminal are connected to the positive input terminal and the negative input terminal of the transformer circuit 30, and the secondary positive output terminal and the secondary negative output terminal are connected to the positive output terminal and the negative output terminal of the transformer circuit 30.
In one embodiment, the switch circuit 511 includes a first switch transistor Q0, a first pole of the first switch transistor Q0 is connected to the positive voltage output terminal of the output control circuit 40, a control pole of the first switch transistor Q0 is connected to the current detection circuit 512, and a second pole of the first switch transistor Q0 is connected to the negative voltage output terminal of the output control circuit 40. The first switching transistor Q0 includes a triode or a MOS transistor. When the transistor is turned on, there is an on-resistance, and in one embodiment, the on-resistance of the transistor may be used as the load resistance of the dummy load circuit. In one embodiment, the switch circuit 511 further includes a load resistor R0, and the load resistor R0 is connected between the first pole of the first switch transistor Q0 and the positive voltage output terminal of the output control circuit 40, or the load resistor R0 is connected between the second pole of the first switch transistor Q0 and the negative voltage output terminal of the output control circuit 40.
In an embodiment, the shaping filter circuit 42 includes a power chip 421, a resistor R1, and a capacitor C1, and the power chip 421 is configured to convert the low-voltage high-frequency alternating current output by the transformer circuit 30 into a direct current. The power chip 421 includes a power output terminal VCC, a power ground terminal GND, and a power control terminal D. The power output terminal VCC is connected to the first connection terminal and the positive voltage output terminal of the output control circuit 40, the power control terminal D is connected to the second connection terminal of the output control circuit 40, and the power ground terminal GND is connected to the negative voltage output terminal of the output control circuit 40. After the resistor R1 and the capacitor C1 are connected in series, one end of the resistor R is connected with the power supply control end D, and the other end of the resistor R is connected with a power supply grounding end GND. In one embodiment, the shaping filter circuit 42 further includes a capacitor C2, one end of which is connected to the power output terminal VCC, and the other end of which is connected to the power ground terminal GND. In one embodiment, the power chip 421 has a chip model number M6142.
Referring to fig. 3, a circuit connection diagram of a power chip of the output control circuit in an embodiment is shown, in which the power chip 421 includes a control unit 4211, a driving unit 4212, a control diode D1, and a second transistor Q1. The control unit 4211 is configured to output an enable control signal to the driving unit 4212, the driving unit 4212 outputs a driving control signal to the second transistor Q1 in response to the enable control signal, and the second transistor Q1 is turned on or off in response to the driving control signal. A control terminal of the second transistor Q1 is connected to the driving unit 4212, and a first pole and a second pole of the transistor Q1 are connected between the power supply control terminal D and the power supply ground terminal GND. The control diode D1 is connected in series between the power control terminal D and the power ground terminal GND.
In one embodiment, the current detection circuit 512 is connected to the power control terminal D, the current detection circuit 512 determines whether the current is present or absent at the positive output terminal or the negative output terminal of the transformer circuit 30 by detecting the current between the first pole and the second pole of the second transistor Q1, and/or the current detection circuit 512 determines whether the current is present or absent at the positive output terminal or the negative output terminal of the transformer circuit according to the switching period of the second transistor Q1.
As shown in fig. 2, the discharge control circuit 20 includes a first diode D21, a second diode D22, a third transistor Q21, a resistor R21, a capacitor C21, and a pulse modulation controller. A control electrode of the third transistor Q21 is connected to the pulse modulation controller, a second electrode of the third transistor Q21 is connected to the rectifier bridge circuit 10, and a first electrode of the third transistor Q21 is connected to the negative input terminal of the voltage transformation circuit 30. An anode of the first diode D21 is connected to a first electrode of the third transistor Q21 and grounded, a cathode of the first diode D21 is connected to a second electrode of the third transistor Q21, and an anode of the second diode D22 is connected to the second electrode of the third transistor Q21. After the resistor R21 and the capacitor C21 are connected in parallel, one end of the resistor R is connected to the positive input end of the transformer circuit 30, and the other end of the resistor R is connected to the negative electrode of the second diode D22. In one embodiment, the discharge control circuit 20 further includes a capacitor C22 connected in series between the positive input terminal of the transformer 30 and ground.
The rectifier bridge circuit 10 includes a first ac input terminal, a second ac input terminal, a first dc output terminal and a second dc output terminal, wherein the first ac input terminal and the second ac input terminal are respectively connected to two output terminals of an ac power source, the first dc output terminal and the second dc output terminal are respectively used as two dc output terminals of the rectifier bridge circuit 10, wherein the first dc output terminal is connected to a positive input terminal of the transformer circuit 30, and the second dc output terminal is grounded. The rectifier bridge circuit 10 includes a third diode D11, a fourth diode D12, a fifth diode D13, and a sixth diode D14. Anodes of the third diode D11 and the fifth diode D13 are connected to the first dc output terminal, cathodes of the fourth diode D12 and the sixth diode D14 are connected to the second dc output terminal, a cathode of the third diode D11 and an anode of the fourth diode D12 are connected to the first ac input terminal, and a cathode of the fifth diode D13 and an anode of the sixth diode D14 are connected to the second ac input terminal.
In one embodiment, the application further discloses an electronic device comprising the power adapter.
In an embodiment of the application, a power adapter and an electronic device are disclosed, which comprise a rectifier bridge circuit, a discharge control circuit, a transformation circuit and an output control circuit. The output control circuit comprises a shaping filter circuit and a dummy load circuit, and the dummy load circuit comprises a switch circuit and a current detection circuit. The current detection circuit controls the switch circuit connected between the two output ends of the power adapter to be switched off or switched on according to the detected presence or absence of the current at the output end of the voltage transformation circuit, so that the voltage is maintained through the switched-on switch circuit when the power adapter is in no-load, and the electric energy loss of the power adapter during loading is further reduced.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims (8)

1. A power adapter, comprising:
the rectifier bridge circuit is used for converting alternating current output by the power supply into direct current;
the discharge control circuit is used for converting the direct current output by the rectifier bridge circuit into high-voltage high-frequency alternating current;
the voltage transformation circuit comprises a positive input end, a negative input end, a positive output end and a negative output end, wherein the positive input end and the negative input end are connected with the discharge control circuit; the voltage transformation circuit is used for converting the high-voltage high-frequency alternating current into low-voltage high-frequency alternating current;
the output control circuit comprises a first connecting end, a second connecting end, a positive voltage output end and a negative voltage output end, wherein the first connecting end and the second connecting end are respectively connected with the positive output end and the negative output end of the voltage transformation circuit, and the positive voltage output end and the negative voltage output end are respectively used as the positive power supply output end and the negative power supply output end of the power adapter; the output control circuit is used for converting the low-voltage high-frequency alternating current into direct current to serve as the output of the power adapter;
the output control circuit comprises a shaping filter circuit and a dummy load circuit; the shaping filter circuit is used for converting the low-voltage high-frequency alternating current into direct current; the dummy load circuit is used for maintaining the voltage of the direct current output by the output control circuit when the power adapter is in no-load;
the dummy load circuit comprises a current detection circuit and a switch circuit, wherein the current detection circuit is connected with the positive output end or the negative output end of the transformation circuit and is used for detecting the current of the positive output end or the negative output end of the transformation circuit so as to control the switch circuit to be switched off or switched on according to the existence or nonexistence of the current of the positive output end or the negative output end of the transformation circuit; the switch circuit is connected between the positive voltage output end and the negative voltage output end of the output control circuit, and the switch circuit is used for conducting when the power adapter is in no-load so as to maintain the voltage of the direct current output by the output control circuit.
2. The power adapter as claimed in claim 1, wherein the shaping filter circuit comprises a power chip, a resistor R1 and a capacitor C1; the power supply chip comprises a power supply output end VCC, a power supply ground end GND and a power supply control end D, and is used for converting the low-voltage high-frequency alternating current output by the voltage transformation circuit into direct current; the power supply output end VCC is connected with the first connecting end and the positive voltage output end, the power supply control end D is connected with the second connecting end, and the power supply ground end GND is connected with the negative voltage output end; after the resistor R1 and the capacitor C1 are connected in series, one end of the resistor R is connected with the power supply control end D, and the other end of the resistor R is connected with the power supply grounding end GND.
3. The power adapter as claimed in claim 2, wherein the shaping filter circuit further comprises a capacitor C2, one end of which is connected to the power ground GND and the other end of which is connected to the power output terminal VCC.
4. The power adapter as claimed in claim 2, wherein the power chip includes a control unit, a driving unit, a control diode D1, and a second transistor Q1; the control unit is used for outputting an enable control signal to the driving unit, the driving unit outputs a driving control signal to the second transistor Q1 in response to the enable control signal, and the second transistor Q1 is turned on or off in response to the driving control signal; the control end of the second transistor Q1 is connected with the driving unit, and the first pole and the second pole of the transistor Q1 are connected between the power supply control end D and the power supply ground end GND; the control diode D1 is connected in series between the power control terminal D and the power ground terminal GND.
5. The power adapter as claimed in claim 4, wherein the current detection circuit is connected to the power control terminal D; the current detection circuit judges whether the positive output end or the negative output end of the transformation circuit has or does not have current by detecting the current between the first pole and the second pole of the second transistor Q1, and/or the current detection circuit judges whether the positive output end or the negative output end of the transformation circuit has or does not have current according to the switching period of the second transistor Q1.
6. The power adapter as claimed in claim 1, wherein the discharge control circuit comprises a first diode D21, a second diode D22, a third transistor Q21, a resistor R21, a capacitor C21, and a pulse modulation controller; a control electrode of the third transistor Q21 is connected to the pulse modulation controller, a second electrode of the third transistor Q21 is connected to the rectifier bridge circuit, and a first electrode of the third transistor Q21 is connected to a negative input terminal of the transformer circuit; an anode of the first diode D21 is connected to a first pole of the third transistor Q21 and grounded, and a cathode of the first diode D21 is connected to a second pole of the third transistor Q21; the anode of the second diode D22 is connected to the second pole of the third transistor Q21; after the resistor R21 and the capacitor C21 are connected in parallel, one end of the resistor R is connected with the positive input end of the voltage transformation circuit, and the other end of the resistor R is connected with the negative electrode of the second diode D22.
7. The power adapter as claimed in claim 6, wherein the discharge control circuit further comprises a capacitor C22 connected in series between the positive input terminal of the transformer circuit and ground.
8. An electronic device comprising a power adapter according to any one of claims 1 to 7.
CN202010393363.1A 2020-05-11 2020-05-11 Power adapter and electronic equipment Active CN111585457B (en)

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CN111585457B true CN111585457B (en) 2023-03-10

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CN112087044B (en) * 2020-09-10 2021-11-19 西安新摩尔半导体有限公司 Charging and discharging control circuit for charging lamp and LED emergency lamp

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