CN106911255B - Power adapter - Google Patents
Power adapter Download PDFInfo
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- CN106911255B CN106911255B CN201510967730.3A CN201510967730A CN106911255B CN 106911255 B CN106911255 B CN 106911255B CN 201510967730 A CN201510967730 A CN 201510967730A CN 106911255 B CN106911255 B CN 106911255B
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a power adapter, comprising: the alternating current input circuit is connected with an external alternating current power supply; the electromagnetic interference filter circuit is used for filtering electromagnetic interference from alternating-current voltage output by the alternating-current input circuit, and the rectification smoothing circuit is connected with the electromagnetic interference filter circuit; the relay switch control circuit is arranged between the alternating current input circuit and the electromagnetic interference filter circuit; the pulse width modulation circuit is connected with the rectifying flat wave circuit; the voltage transformation rectification filter circuit is connected with the pulse width modulation circuit; the direct-current voltage output circuit is respectively connected with the voltage transformation rectification filter circuit and the standby detection control circuit; and the standby detection control circuit is connected with the relay switch control circuit. The power adapter disclosed by the invention can obviously reduce the standby power consumption of the power adapter, has higher stability and reliability, is beneficial to providing stable power supply for various loads such as a display and the like, and ensures the normal operation of various loads such as the display and the like.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a power adapter.
Background
In recent years, with the increasing living standard of people, household electrical appliances such as televisions, video cameras, cameras and the like are more and more popular in daily life and life, and various electrical appliances become indispensable components of life of people.
At present, for electrical equipment such as a display, it is generally necessary to connect to an external power supply through a power adapter. For the displays on the market at present, the standby power is generally about 0.5W in the standby state, so that each display consumes 4.35kW every year. When thousands of displays are in standby state, not only energy is greatly wasted, but also the environment is seriously polluted.
For a display, its overall standby power consumption mainly includes two parts: the first part is the consumption of the display itself; the second part is the consumption of the power adapter. The current display generally only needs about 14V of direct current driving voltage, and is supplied by a power adapter, the self load of the excellent display in a standby state is about 30uA, and in the standby state, the standby power of the power adapter is about 70mW, and the self standby power of the display is 14V 30uA (420 uW). Therefore, for the display, the power adapter connected to the display is the main part of power consumption during standby, and the reason is mainly that the current power adapter generally adopts a flyback topology, and in the standby state, each part of the universal topology is still in an operating state, and standby power consumption is difficult to reduce in a common way.
Therefore, there is an urgent need to develop a power adapter which can significantly reduce the standby power consumption of the power adapter and has high stability and reliability.
Disclosure of Invention
In view of this, an object of the present invention is to provide a power adapter, which can significantly reduce the standby power consumption of the power adapter, and has high stability and reliability, low production cost, good electromagnetic compatibility, and is beneficial to providing stable power supply for various loads such as a display, and ensuring the normal operation of various loads such as the display, and has great practical significance in production.
To this end, the present invention provides a power adapter comprising:
the alternating current input circuit is connected with an external alternating current power supply and is used for receiving alternating current voltage output by the external alternating current power supply and then outputting the alternating current voltage to the electromagnetic interference filter circuit and the rectification flat wave circuit;
the electromagnetic interference filter circuit is used for filtering electromagnetic interference from the alternating current voltage output by the alternating current input circuit;
the rectification smoothing circuit is connected with the electromagnetic interference filter circuit and is used for rectifying the alternating-current voltage output by the alternating-current input circuit and the alternating-current voltage output by the electromagnetic interference filter circuit to form direct-current voltage, and then the direct-current voltage is output to the pulse width modulation circuit after being filtered;
the relay switch control circuit is arranged between the alternating current input circuit and the electromagnetic interference filter circuit and is used for correspondingly controlling connection or disconnection between the alternating current input circuit and the electromagnetic interference filter circuit according to a high-level or low-level relay switch control signal output by the standby detection control circuit;
the pulse width modulation circuit is connected with the rectifying and smoothing circuit and is used for performing pulse width modulation on the direct-current voltage output by the rectifying and smoothing circuit to form direct-current voltage in a preset frequency range and then outputting the direct-current voltage to the voltage transformation rectifying and filtering circuit;
the voltage transformation rectification filter circuit is connected with the pulse width modulation circuit and is used for carrying out voltage reduction treatment on the direct current voltage output by the pulse width modulation circuit, carrying out synchronous rectification filtering and then outputting the direct current voltage to the direct current voltage output circuit;
the direct current voltage output circuit is respectively connected with the voltage transformation rectification filter circuit and the standby detection control circuit and is used for receiving the direct current voltage sent by the voltage transformation rectification filter circuit, correspondingly increasing or decreasing the output direct current voltage according to a high-level or low-level control signal sent by the standby detection control circuit and then outputting the direct current voltage to external electrical equipment;
and the standby detection control circuit is connected with the relay switch control circuit and is used for detecting the output voltage value of the direct-current voltage output circuit, comparing the output voltage value with a preset standby voltage threshold value, correspondingly outputting a high-level or low-level relay control signal to the relay switch control circuit according to a comparison result, and outputting a high-level or low-level voltage control signal to the direct-current voltage output circuit.
Wherein the standby detection control circuit comprises the following sub-circuits:
the voltage detection comparison sub-circuit is connected with the voltage detection comparison sub-circuit and is used for detecting the output voltage value of the direct-current voltage output circuit, comparing the output voltage value with a preset standby voltage threshold value and outputting a comparison result to the voltage output control sub-circuit;
the standby state control sub-circuit is connected with the voltage detection comparison sub-circuit and is used for judging that external electric equipment is in a standby state when the output voltage value is greater than or equal to a preset standby voltage threshold value, outputting a low-level relay switch control signal to the relay switch control circuit and outputting a low-level voltage control signal to the direct-current voltage output circuit;
and the normal state control sub-circuit is used for judging that the external electrical equipment is in a normal working state when the output voltage value is lower than a preset standby voltage threshold value, outputting a high-level relay switch control signal to the relay switch control circuit and outputting a high-level voltage control signal to the direct-current voltage output circuit.
Wherein the standby detection control circuit further comprises:
and the closing control sub-circuit is connected with the voltage detection comparison sub-circuit and is used for comparing the output voltage value of the direct-current voltage output circuit with a preset detection closing voltage threshold value, and controlling the standby detection control circuit to stop working when the output voltage value is smaller than or equal to the preset detection closing voltage threshold value.
The alternating current input circuit comprises a first voltage input end Vin1, the first voltage input end Vin1 is connected in parallel with a voltage dependent resistor V1, and an overcurrent protection device is arranged on a connecting line between the first voltage input end Vin1 and the voltage dependent resistor V1.
Wherein the overcurrent protection device is a fuse.
The electromagnetic interference filter circuit comprises a common-mode inductor LX1, wherein an input end A1 of the common-mode inductor LX1 is respectively connected in parallel with a series branch consisting of a resistor RX1, a resistor RX2 and a resistor RX 3;
the input end A1 of the common mode inductor LX1 comprises a pin 4 and a pin 3, wherein the pin 4 is connected with a zero line input end N of a first voltage input end Vin1 in the alternating current input circuit through a relay RL1 in the relay switch control circuit, and the pin 3 is connected with a live line input end L of the first voltage input end Vin 1;
the output terminal B1 of the common mode inductor LX1 includes a pin 1 and a pin 2.
The rectifying flat-wave circuit comprises a rectifying bridge DB1, a diode D1, a diode D2 and an electrolytic capacitor C;
the rectifier bridge DB1 comprises pins 1-4, in the rectifier bridge DB1, the pin 2 and the pin 3 are respectively connected with the pin 1 and the pin 2 of the output end B1 of the common mode inductor LX1 in the electromagnetic interference filter circuit, and the pin 4 of the rectifier bridge DB1 is grounded;
the anode of the diode D1 is connected to the zero line input end N of the first voltage input end Vin1, the cathode of the diode D1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the pin 1 of the rectifier bridge DB1 and the first voltage output end V out1, the first voltage output end V out1 is connected to the anode of the electrolytic capacitor C, and the cathode of the electrolytic capacitor C is grounded.
The relay switch control circuit comprises a control signal input end SS, a switching tube Q1, a switching tube Q2 and a relay RL 1;
the switch part A2 of the relay RL1 is arranged between a pin 4 of a common mode inductor LX1 in the electromagnetic interference filter circuit and a zero line input end N of a first voltage input end Vin1 in the alternating current input circuit;
the control signal input end SS is used for receiving a high-level or low-level relay switch control signal output by the standby detection control circuit;
the control signal input end SS is sequentially connected with a resistor R4 and a grid G of a switching tube Q2, a source S of the switching tube Q2 is respectively connected with a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are grounded;
the drain D of the switching tube Q2 is respectively connected with a resistor R2, a resistor R3, a capacitor C2 and a grid G of a diode Q1, the resistor R3 and the resistor C2 are grounded, and the source S of the diode Q1 is grounded;
the resistor R2 is connected with the total voltage output end Vout of the power adapter;
the drain D of the diode Q1 is connected with a resistor R1 and a section of an inductance part B2 in a relay RL1 in sequence, and the other end of the inductance part B2 in the relay RL1 is connected with the total voltage output end Vout of the power adapter.
The Pulse Width Modulation (PWM) circuit comprises a pulse width modulation chip IC1, and the pulse width modulation chip IC1 comprises pins 1-8;
in the pulse width modulation chip IC1, the pin 1 is grounded, the pin 2 is respectively connected to the anode of an electrolytic capacitor C5 and the cathode of a diode D4, the cathode of the electrolytic capacitor C5 is grounded, and the anode of the diode D4 is connected to the voltage input terminal 1 of a transformer T1 in the transformer rectifier filter circuit;
the pin 3 is respectively connected with a capacitor C6 and a pin 1 of an optical coupler OP1 in the voltage transformation rectifying and filtering circuit;
the pin 4 is a hollow pin, the pin 5, the pin 6, the pin 7 and the pin 8 are connected, the pin 5 is respectively connected with the anode of the diode D3 and the voltage input terminal 3 of the transformer T1 in the transformer rectifier filter circuit, the cathode of the diode D3 is respectively connected with the capacitor C4 and the resistor R6, the capacitor C4 and the resistor R6 are connected with the voltage input terminal 4 of the transformer T1 in the transformer rectifier filter circuit, and the capacitor C4 and the resistor R6 are connected with the first voltage output terminal V out 1.
The transformer rectification filter circuit comprises a transformer T1 and an optical coupler OP1, wherein a voltage input terminal 2 of the transformer T1 is grounded, and a voltage output terminal 6 of the transformer T1 is grounded;
the voltage output terminal 5 of the transformer T1 is respectively connected with the anode of a diode D5 and a capacitor C7, and the capacitor C7 is respectively connected with the cathode of a diode D5 and a total voltage output terminal Vout;
the total voltage output end Vout is connected with the anode of an electrolytic capacitor C8, and the cathode of the electrolytic capacitor C8 is grounded;
a pin 2 of the optical coupler OP1 is grounded, and a pin 4 of the optical coupler OP1 is sequentially connected with a resistor R8 and a total voltage output end Vout;
a pin 3 of the optical coupler OP1 is respectively connected with a pin 2 of an error amplifier IC2, a resistor R9 and a capacitor C9, the resistor R9 is connected with the total voltage output end Vout, and the capacitor C9 is sequentially connected with a resistor R10 and a pin 1 of the error amplifier IC 2;
the pin 3 of the error amplifier IC2 is grounded, and the pin 3 of the error amplifier IC2 is connected with the pin 2 of the optical coupler OP1 through a capacitor CY 1.
The standby detection control circuit comprises a standby detection control chip IC3, a voltage detection terminal sense and an access voltage terminal VCC of the standby detection control chip IC3 are respectively connected with the total voltage output end Vout, and a grounding terminal GND of the standby detection control chip IC3 is grounded;
the first voltage control signal output terminal out1 of the standby detection control chip IC3 is connected to the control signal input terminal SS of the relay switch control circuit.
The direct-current voltage output circuit comprises a triode Q3, an emitter E of the triode Q3 is grounded, a base B of the triode Q3 is respectively connected with a resistor R16, a resistor R15 and a capacitor C10, and the resistor R15 and the capacitor C10 are grounded;
the resistor R16 is connected to the second voltage control signal output terminal out2 of the standby detection control chip IC 3;
a collector C of the triode Q3 is respectively connected with a resistor R12 and a resistor R13, the resistor R13 is grounded, and the resistor R12 is sequentially connected with a resistor R11 and the total voltage output end Vout;
the connection node between the resistor R12 and the resistor R11 is also connected to pin 1 of the error amplifier IC 2.
Compared with the prior art, the power adapter provided by the invention has the advantages that the standby power consumption of the power adapter can be obviously reduced, the stability and the reliability are high, stable power supply can be provided for various loads such as a display and the like, the normal operation of the various loads such as the display and the like can be ensured, and the power adapter has great production practice significance.
In addition, the power adapter provided by the invention only needs to adopt fewer electronic components, so that the power adapter is lower in production cost and good in electromagnetic compatibility, and is beneficial to wide production and popularization.
Drawings
FIG. 1 is a block diagram of a power adapter according to the present invention;
FIG. 2 is a connection circuit diagram of an AC input circuit, an electromagnetic interference filter circuit, a rectification smoothing circuit, and a relay switch control circuit in the power adapter according to the present invention;
FIG. 3 is a circuit diagram illustrating a connection between a PWM circuit and a transformer rectifier filter circuit in a power adapter according to the present invention;
fig. 4 is a circuit diagram illustrating a connection between a dc voltage output circuit and a standby detection control circuit in a power adapter according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1, the present invention provides a power adapter, comprising an ac input circuit 101, an electromagnetic interference filter circuit 102, a smoothing rectifier circuit 103, a relay switch control circuit 104, a Pulse Width Modulation (PWM) circuit 105, a transformer rectifier filter circuit 106, a dc voltage output circuit 107, and a standby detection control circuit 108, wherein:
the alternating current input circuit 101 is connected with an external alternating current power supply, and is used for receiving alternating current voltage output by the external alternating current power supply and then outputting the alternating current voltage to the electromagnetic interference filter circuit 102 and the rectification flat wave circuit 103;
the electromagnetic interference filter circuit 102 is configured to filter electromagnetic interference, specifically, conducted interference and radiated interference of the electromagnetic interference, from the ac voltage output by the ac input circuit 101, and then output the electromagnetic interference to the rectifier smoothing circuit 103;
a rectifying and smoothing circuit 103, connected to the electromagnetic interference filter circuit 102, for rectifying the ac voltage output by the ac input circuit 101 and the ac voltage output by the electromagnetic interference filter circuit 102 to form a dc voltage, and outputting the dc voltage to a Pulse Width Modulation (PWM) circuit 105 after filtering;
a relay switch control circuit 104, disposed between the ac input circuit 101 and the emi filter circuit 102, for controlling to turn on or off the connection between the ac input circuit 101 and the emi filter circuit 102 according to a high-level or low-level relay switch control SIGNAL (STANDBY SIGNAL) output by the STANDBY detection control circuit 108;
a Pulse Width Modulation (PWM) circuit 105, connected to the smoothing circuit 103, for performing pulse width modulation on the dc voltage output by the smoothing circuit 103 to form a dc voltage within a preset frequency range, and outputting the dc voltage to the transformer rectification filter circuit 106;
a voltage transformation rectification filter circuit 106 connected to the Pulse Width Modulation (PWM) circuit 105, for performing voltage reduction processing on the dc voltage output by the Pulse Width Modulation (PWM) circuit 105, performing synchronous rectification filtering, and outputting the dc voltage to the dc voltage output circuit 107;
a dc voltage output circuit 107, respectively connected to the transformer rectifier filter circuit 106 and the standby detection control circuit 108, for receiving the dc voltage from the transformer rectifier filter circuit 106, and increasing or decreasing the output dc voltage according to a high-level or low-level control signal from the standby detection control circuit 108, and then outputting the dc voltage to an external electrical device (i.e., a load);
and a standby detection control circuit 108, connected to the relay switch control circuit 104, for detecting an output voltage value of the dc voltage output circuit 107, comparing the output voltage value with a preset standby voltage threshold, and according to a comparison result, correspondingly outputting a high-level or low-level relay control signal to the relay switch control circuit 104, and outputting a high-level or low-level voltage control signal to the dc voltage output circuit 107.
In the present invention, the external electrical device may be any electrical device, such as a display, a television, a notebook computer, and the like.
In a specific implementation of the present invention, the standby detection control circuit may specifically be a standby detection control chip, and the circuit may specifically include the following sub-circuits:
the voltage detection comparison sub-circuit is connected with the voltage detection comparison sub-circuit and is used for detecting the output voltage value of the direct current voltage output circuit 107, comparing the output voltage value with a preset standby voltage threshold value and outputting a comparison result to the voltage output control sub-circuit;
a standby state control sub-circuit, connected to the voltage detection and comparison sub-circuit, for determining that the external electrical equipment is in a standby state when the output voltage value is greater than or equal to a preset standby voltage threshold, outputting a relay switch control signal of a low level (e.g., 0 volt level) to the relay switch control circuit 104, and outputting a voltage control signal of a low level (e.g., 0 volt level) to the dc voltage output circuit 107;
and a normal state control sub-circuit, configured to determine that the external electrical device is in a normal operating state when the output voltage value is lower than a preset standby voltage threshold, output a relay switch control signal with a high level (e.g., 1 volt level) to the relay switch control circuit 104, and output a voltage control signal with a high level (e.g., 1 volt level) to the dc voltage output circuit 107.
In addition, in order to further save power and reduce the standby power consumption of the standby detection control circuit itself, the standby detection control circuit 108 may further include:
and a shutdown control sub-circuit, connected to the voltage detection comparison sub-circuit, for comparing the output voltage value of the dc voltage output circuit 107 with a preset detection shutdown voltage threshold, and controlling the standby detection control circuit to stop working (i.e. stop the operation voltage detection comparison sub-circuit, the standby state control sub-circuit, and the normal state control sub-circuit) when the output voltage value is less than or equal to the preset detection shutdown voltage threshold.
In order to clearly understand the above-described circuits of the present invention, specific structures of the circuits are described below.
Referring to fig. 2, in the present invention, the ac input circuit 101 includes a first voltage input terminal Vin1 (specifically, a live input terminal L and a neutral input terminal N may be included), the first voltage input terminal Vin1 is connected in parallel with a voltage dependent resistor V1, and a fuse F1 is connected between the first voltage input terminal Vin1 and the voltage dependent resistor V1.
It should be noted that the Varistor V1 is a lightning strike discharge protection device, and the british name Varistor is composed of two butt-jointed diodes, and is used for instantly conducting and discharging when a lightning strike is applied to the first voltage input terminal Vin1, so as to achieve the purpose of protecting loads such as external electrical equipment connected to the rear end.
In the present invention, the first voltage input terminal Vin1 is used for inputting an external ac voltage.
In the present invention, the fuse F1 plays a role in circuit overcurrent protection, and in particular, the fuse may be replaced by another overcurrent protection device.
Referring to fig. 2, in the present invention, for the emi filter circuit 102, it is used to filter out the conducted interference and radiated interference of emi, and the circuit has a significant effect on suppressing the conducted interference and the radiated emi in the power adapter provided by the present invention.
Referring to fig. 2, in the present invention, the emi filter circuit 102 includes a common mode inductor LX1, and an input terminal a1 of the common mode inductor LX1 is connected in parallel to a series branch consisting of a resistor RX1, a resistor RX2 and a resistor RX3, respectively;
the input end A1 of the common mode inductor LX1 comprises a pin 4 and a pin 3, wherein the pin 4 is connected with a zero line input end N of a first voltage input end Vin1 in the alternating current input circuit 101 through a relay RL1 in the relay switch control circuit 104, and the pin 3 is connected with a live line input end L of the first voltage input end Vin 1;
the output terminal B1 of the common mode inductor LX1 includes a pin 1 and a pin 2.
It should be noted that the common mode inductor LX1 has a significant suppression effect on common mode interference and electromagnetic radiation.
Referring to fig. 2, in the present invention, the smoothing rectifier circuit 103 includes a rectifier bridge DB1, a diode D1, a diode D2, and an electrolytic capacitor C;
the rectifier bridge DB1 comprises pins 1-4, in the rectifier bridge DB1, the pin 2 and the pin 3 are respectively connected with the pin 1 and the pin 2 which are arranged at the output end B1 of the common mode inductor LX1 in the electromagnetic interference filter circuit 102, and the pin 4 of the rectifier bridge DB1 is grounded;
the anode of the diode D1 is connected to the zero line input end N of the first voltage input end Vin1, the cathode of the diode D1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the pin 1 of the rectifier bridge DB1 and the first voltage output end V out1, the first voltage output end V out1 is connected to the anode of the electrolytic capacitor C, and the cathode of the electrolytic capacitor C is grounded.
Referring to fig. 2, in the present invention, the relay switch control circuit 104 includes a control signal input terminal SS, a switching tube Q1, a switching tube Q2 and a relay RL 1;
the switch part A2 of the relay RL1 is arranged between the pin 4 of the common mode inductor LX1 in the electromagnetic interference filter circuit 102 and the zero line input end N of the first voltage input end Vin1 in the alternating current input circuit 101;
the control signal input terminal SS is used for receiving a high-level or low-level relay switch control signal output by the standby detection control circuit 108;
the control signal input end SS is sequentially connected with a resistor R4 and a grid G of a switching tube Q2, a source S of the switching tube Q2 is respectively connected with a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are grounded;
the drain D of the switching tube Q2 is respectively connected with a resistor R2, a resistor R3, a capacitor C2 and a grid G of a diode Q1, the resistor R3 and the resistor C2 are grounded, and the source S of the diode Q1 is grounded;
the resistor R2 is connected with the total voltage output end Vout of the power adapter;
the drain D of the diode Q1 is connected with a resistor R1 and a section of an inductance part B2 in a relay RL1 in sequence, and the other end of the inductance part B2 in the relay RL1 is connected with the total voltage output end Vout of the power adapter.
In the invention, the switching tube Q1 and the switching tube Q2 are power field effect transistors MOSFET.
The relay switch control circuit 104 is capable of controlling to turn on or off the connection between the ac input circuit 101 and the emi filter circuit 102 in response to a high-level or low-level relay switch control SIGNAL (STANDBY SIGNAL) output from the STANDBY detection control circuit 108. .
The operation of the relay switch control circuit 104 will be briefly described.
When the power adapter provided by the present invention is in a normal operation state, that is, the power adapter is connected to an external electrical device (that is, a load) such as a display, and the output voltage of the total voltage output terminal Vout is 14V, if the standby detection control circuit 108 inputs a relay switch control signal (that is, a standby control signal) of a high level of 1V to the control signal input terminal SS of the relay switch control circuit 104, so that both the diode Q1 and the diode Q2 in the relay switch control circuit 104 shown in fig. 2 are turned on, the inductor portion B2 of the relay RL1 passes a current, and the switch portion a2 of the relay RL1 is closed. Therefore, the differential-mode capacitor CX1 and the common-mode inductor LX1 can be connected to the power adapter provided by the present invention to work normally.
When the power adapter provided by the present invention is in a standby operation state, i.e., when the load is small, if the standby detection control circuit 108 inputs a low-level relay switch control signal (i.e., standby control signal) of 0V to the control signal input terminal SS of the relay switch control circuit 104, at this time, the diode Q1 and the diode Q2 cannot be turned on, no current flows through the inductance portion B2 of the relay RL1, and the switch portion a2 of the relay RL1 is turned off. Therefore, at this time, the differential mode capacitor CX1 and the common mode inductor LX1 are disconnected, and the input external ac voltage is half-wave rectified by the diode D1 and the diode D2 in the smoothing rectifier circuit 103 shown in fig. 2, so that the power adapter provided by the present invention can still operate after the differential mode capacitor CX1 and the common mode inductor LX1 are disconnected in a standby state.
In the present invention, it should be noted that the Pulse Width Modulation (PWM) circuit 105 is a pulse width modulation PWM, which is a ratio (duty ratio) of a high level time to a whole period in one period of a control pulse signal.
Referring to FIG. 3, the Pulse Width Modulation (PWM) circuit 105 includes a pulse width modulation chip IC1, the pulse width modulation chip IC1 including pins 1-8;
in the pulse width modulation chip IC1, the pin 1 is grounded, the pin 2 is respectively connected to the anode of an electrolytic capacitor C5 and the cathode of a diode D4, the cathode of the electrolytic capacitor C5 is grounded, and the anode of the diode D4 is connected to the voltage input terminal 1 of the transformer T1 in the transformer rectifier filter circuit 106;
the pin 3 is respectively connected with the capacitor C6 and a pin 1 of the optocoupler OP1 in the transformer rectification filter circuit 106;
the pin 4 is a hollow pin, the pin 5, the pin 6, the pin 7 and the pin 8 are connected, the pin 5 is respectively connected with the anode of the diode D3 and the voltage input terminal 3 of the transformer T1 in the transformer rectifier filter circuit 106, the cathode of the diode D3 is respectively connected with the capacitor C4 and the resistor R6, the capacitor C4 and the resistor R6 are connected with the voltage input terminal 4 of the transformer T1 in the transformer rectifier filter circuit 106, and the capacitor C4 and the resistor R6 are connected with the first voltage output terminal V out 1.
It should be noted that, in the pwm chip IC1, the pin 1 is a ground terminal GND, the pin 2 is a power supply terminal VCC, the pin 3 is a feedback terminal FB, the pin 4 is a null pin, the pin 6, the pin 7, and the pin 8 are voltage input terminals DRAIN, and the pin 5 is a power start terminal VSTR.
Referring to fig. 3, the transformer rectifier filter circuit 106 includes a transformer T1 and an optical coupler OP1, wherein a voltage input terminal 2 of the transformer T1 is grounded and a voltage output terminal 6 is grounded;
the voltage output terminal 5 of the transformer T1 is respectively connected with the anode of a diode D5 and a capacitor C7, and the capacitor C7 is respectively connected with the cathode of a diode D5 and a total voltage output terminal Vout;
the total voltage output end Vout is connected with the anode of an electrolytic capacitor C8, and the cathode of the electrolytic capacitor C8 is grounded;
a pin 2 of the optical coupler OP1 is grounded, and a pin 4 of the OP1 is sequentially connected with a resistor R8 and a total voltage output end Vout;
a pin 3 of the optical coupler OP1 is respectively connected with a pin 2 of an error amplifier IC2, a resistor R9 and a capacitor C9, the resistor R9 is connected with the total voltage output end Vout, and the capacitor C9 is sequentially connected with a resistor R10 and a pin 1 of the error amplifier IC 2;
the pin 3 of the error amplifier IC2 is grounded, and the pin 3 of the error amplifier IC2 is connected with the pin 2 of the optical coupler OP1 through a capacitor CY 1.
It should be noted that, in the optical coupler OP1, the pin 1 is an anode of a light emitting diode, the pin 2 is a cathode of the light emitting diode, the pin 3 is an emitter of a photosensitive semiconductor tube, and the pin 4 is a collector of the photosensitive semiconductor tube.
Referring to fig. 4, in the present invention, in a specific implementation, the standby detection control circuit 108 includes a standby detection control chip IC3, a voltage detection terminal sense and an access voltage terminal VCC of the standby detection control chip IC3 are respectively connected to the total voltage output terminal Vout, and a ground terminal GND of the standby detection control chip IC3 is grounded;
the first voltage control signal output terminal out1 of the standby detection control chip IC3 is connected to the control signal input terminal SS of the relay switch control circuit 104.
Referring to fig. 4, in the present invention, in a specific implementation, the dc voltage output circuit 107 includes a transistor Q3, an emitter E of the transistor Q3 is grounded, a base B of the transistor Q3 is respectively connected to a resistor R16, a resistor R15 and a capacitor C10, and the resistor R15 and the capacitor C10 are grounded;
the resistor R16 is connected to the second voltage control signal output terminal out2 of the standby detection control chip IC 3.
A collector C of the triode Q3 is respectively connected with a resistor R12 and a resistor R13, the resistor R13 is grounded, and the resistor R12 is sequentially connected with a resistor R11 and the total voltage output end Vout;
in the present invention, in a specific implementation, the connection node between the resistor R12 and the resistor R11 is further connected to pin 1 of the error amplifier IC 2.
In the present invention, the standby detection control circuit 108 can detect the size of a load such as a display by the standby detection control chip IC3, and output a high-level or low-level voltage control signal.
In the present invention, the high-level voltage is 1V, and the low-level voltage is 0V. Therefore, when the power adapter provided by the present invention is connected to a load such as a display, and the load is large, that is, when it normally operates, the first voltage control signal output terminal out1 and the second voltage control signal output terminal out2 of the standby detection control chip IC3 output voltage control signals of high level (1V voltage);
when a load such as a power adapter connection display is in a standby state and the load is small, the first voltage control signal output terminal out1 and the second voltage control signal output terminal out2 of the standby detection control chip IC3 output a voltage control signal of a low level (0V voltage).
The following describes a mode in which the standby detection control circuit 108 according to the present invention detects a load of the dc voltage output circuit 107 (i.e., an output voltage to an external load such as a display), and outputs a high-level or low-level voltage control signal to the relay switch control circuit 104 and the dc voltage output circuit 107, respectively.
It should be noted that, for a power adapter, the output voltage will decrease under a large load condition, and the output voltage will increase under a small load condition. Taking advantage of this feature of the power supply, the present invention is directed to implementing the load detection function of the standby detection control chip IC 3.
As shown in fig. 4. When the power adapter provided by the invention is connected with a load such as a display and the like, and the load is large, namely when the power adapter works normally, after the voltage detection terminal (SENSE terminal) of the standby detection control chip IC3 detects that the output voltage of the total voltage output end Vout is lower than a preset standby voltage threshold (such as 14.30V voltage), the first voltage control signal output terminal out1 and the second voltage control signal output terminal out2 of the standby detection control chip IC3 output high-level (1V voltage) voltage control signals;
when the load such as a power adapter connection display is in a standby state and the load is small, the voltage detection terminal (SENSE terminal) of the standby detection control chip IC3 detects that the output voltage of the total voltage output terminal Vout reaches a preset standby voltage threshold (e.g., 14.30V voltage), and then the first voltage control signal output terminal out1 and the second voltage control signal output terminal out2 of the standby detection control chip IC3 output low-level (0V voltage) voltage control signals.
When the voltage detection terminal (SENSE terminal) of the standby detection control chip IC3 detects that the output voltage of the total voltage output terminal Vout reaches a preset detection off voltage threshold (e.g., 3.0V), the standby detection control chip IC3 stops working, and the first voltage control signal output terminal out1 and the second voltage control signal output terminal out2 of the standby detection control chip IC3 do not output any voltage level.
With the present invention, the standby detection control circuit 108 can reduce the output voltage to the load such as the display by controlling the dc voltage output circuit 107, thereby reducing the standby power consumption of the display itself.
The operation principle of the standby detection control circuit 108 for reducing the output voltage of the dc voltage output circuit 107 and thus reducing the standby power consumption of the display itself when the external electrical device is in the standby state will be briefly described.
In particular, the power adapter provided by the invention can reduce the output voltage of the direct-current voltage output circuit 107 from 14V to 3V.
Because the output voltage of the power adapter is determined by the resistance of the voltage dividing resistor of the comparator, the output voltage is 2.5V (1+ upper/lower voltage dividing resistors). Referring to fig. 4, the resistor R11 is an upper voltage dividing resistor, and the resistors R12 and R1 are lower voltage dividing resistors.
Therefore, when the power adapter provided by the present invention is connected to a load such as a display, that is, during normal operation, the second voltage control signal output terminal out2 of the standby detection control chip IC3 outputs a voltage of 1V, so that the switching tube Q3 is driven and closed to short the resistor R13 to ground, at this time, the output voltage is 2.5V (1+ R11/R12);
when the load such as the power adapter connection display provided by the invention is in a standby state, the second voltage control signal output terminal out2 of the standby detection control chip IC3 has no output voltage, the switching tube Q3 cannot be driven and is in an off state, the comparison voltage forms a current loop through the resistor R13, and the output voltage is 2.5V [1+ R11/(R12+13) ].
Therefore, for the existing power adapter, if the power adapter is in standby, the current value of the external load such as a display is 30uA, and at this time, if the output voltage is 14V, the energy consumed by the load is 14V × 30uA, which is 420 uW; by applying the power adapter provided by the invention, if the output voltage of the power adapter can be reduced from 14V to 3V in a standby state, the energy consumed by the external load such as a display is 3V 30uA and 90uW at this time, so that compared with the prior art, the standby power consumption of the power adapter provided by the invention is reduced by nearly 5 times, and the standby energy consumption of the power adapter is remarkably saved.
In the present invention, it should be noted that, according to the specification of the international power consumption test standard IEC62301, the standby efficiency of the household electronic device is below 5mW, which may be referred to as 0.00W, and therefore, the power adapter provided in the present invention may be said to be a power adapter with zero standby consumption.
Based on the above technical solution, the present invention provides a power adapter, which can detect a change in a voltage value output to a load such as a display, and in a standby state, control a relay switch control circuit 104 through a standby detection control circuit, and further control disconnection between an electromagnetic interference filter circuit 102 (i.e., an electromagnetic radiation suppression circuit) and an ac input circuit 101, so as to reduce standby power consumption of the power adapter;
meanwhile, the power consumption of the standby detection control circuit 108 can be reduced by making the standby detection control circuit 108 enter a specific standby burst mode, so that the overall standby power consumption of the power adapter is reduced.
In addition, the invention also reduces the output voltage to the load such as the display through controlling the direct current voltage output circuit 107 by the standby detection control circuit 108, thereby reducing the standby power consumption of the display.
In summary, compared with the prior art, the power adapter provided by the invention can significantly reduce the standby power consumption of the power adapter, has high stability and reliability, is beneficial to providing stable power supply for various loads such as a display and the like, ensures the normal operation of various loads such as the display and the like, and has great production practice significance.
In addition, the power adapter provided by the invention only needs to adopt fewer electronic components, so that the power adapter is lower in production cost and good in electromagnetic compatibility, and is beneficial to wide production and popularization.
In addition, the power adapter provided by the invention only needs to adopt fewer electronic components, so that the power adapter is lower in production cost and good in electromagnetic compatibility, and is beneficial to wide production and popularization.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A power adapter, comprising:
the alternating current input circuit is connected with an external alternating current power supply and is used for receiving alternating current voltage output by the external alternating current power supply and then outputting the alternating current voltage to the electromagnetic interference filter circuit and the rectification flat wave circuit;
the electromagnetic interference filter circuit is used for filtering electromagnetic interference from the alternating current voltage output by the alternating current input circuit;
the rectification smoothing circuit is connected with the electromagnetic interference filter circuit and is used for rectifying the alternating-current voltage output by the alternating-current input circuit and the alternating-current voltage output by the electromagnetic interference filter circuit to form direct-current voltage, and then the direct-current voltage is output to the pulse width modulation circuit after being filtered;
the relay switch control circuit is arranged between the alternating current input circuit and the electromagnetic interference filter circuit and is used for correspondingly controlling connection or disconnection between the alternating current input circuit and the electromagnetic interference filter circuit according to a high-level or low-level relay switch control signal output by the standby detection control circuit;
the pulse width modulation circuit is connected with the rectifying and smoothing circuit and is used for performing pulse width modulation on the direct-current voltage output by the rectifying and smoothing circuit to form direct-current voltage in a preset frequency range and then outputting the direct-current voltage to the voltage transformation rectifying and filtering circuit;
the voltage transformation rectification filter circuit is connected with the pulse width modulation circuit and is used for carrying out voltage reduction treatment on the direct current voltage output by the pulse width modulation circuit, carrying out synchronous rectification filtering and then outputting the direct current voltage to the direct current voltage output circuit;
the direct current voltage output circuit is respectively connected with the voltage transformation rectification filter circuit and the standby detection control circuit and is used for receiving the direct current voltage sent by the voltage transformation rectification filter circuit, correspondingly increasing or decreasing the output direct current voltage according to a high-level or low-level control signal sent by the standby detection control circuit and then outputting the direct current voltage to external electrical equipment;
and the standby detection control circuit is connected with the relay switch control circuit and is used for detecting the output voltage value of the direct-current voltage output circuit, comparing the output voltage value with a preset standby voltage threshold value, correspondingly outputting a high-level or low-level relay control signal to the relay switch control circuit according to a comparison result, and outputting a high-level or low-level voltage control signal to the direct-current voltage output circuit.
2. The power adapter as described in claim 1, wherein said standby detection control circuit comprises the following sub-circuits:
the voltage detection comparison sub-circuit is connected with the voltage detection comparison sub-circuit and is used for detecting the output voltage value of the direct-current voltage output circuit, comparing the output voltage value with a preset standby voltage threshold value and outputting a comparison result to the voltage output control sub-circuit;
the standby state control sub-circuit is connected with the voltage detection comparison sub-circuit and is used for judging that external electric equipment is in a standby state when the output voltage value is greater than or equal to a preset standby voltage threshold value, outputting a low-level relay switch control signal to the relay switch control circuit and outputting a low-level voltage control signal to the direct-current voltage output circuit;
and the normal state control sub-circuit is used for judging that the external electrical equipment is in a normal working state when the output voltage value is lower than a preset standby voltage threshold value, outputting a high-level relay switch control signal to the relay switch control circuit and outputting a high-level voltage control signal to the direct-current voltage output circuit.
3. The power adapter as described in claim 2, wherein said standby detection control circuit further comprises:
and the closing control sub-circuit is connected with the voltage detection comparison sub-circuit and is used for comparing the output voltage value of the direct-current voltage output circuit with a preset detection closing voltage threshold value, and controlling the standby detection control circuit to stop working when the output voltage value is smaller than or equal to the preset detection closing voltage threshold value.
4. The power adapter as claimed in claim 1, wherein the ac input circuit comprises a first voltage input terminal Vin1, the first voltage input terminal Vin1 is connected in parallel with a voltage dependent resistor V1, and a line between the first voltage input terminal Vin1 and the voltage dependent resistor V1 is provided with an overcurrent protection device.
5. The power adapter as claimed in claim 4, wherein the overcurrent protection device is a fuse.
6. The power adapter as claimed in claim 4 or 5, wherein the EMI filter circuit comprises a common mode inductor LX1, and the input terminal A1 of the common mode inductor LX1 is connected in parallel with a series branch consisting of a resistor RX1, a resistor RX2 and a resistor RX 3;
the input end A1 of the common mode inductor LX1 comprises a pin 4 and a pin 3, wherein the pin 4 is connected with a zero line input end N of a first voltage input end Vin1 in the alternating current input circuit through a relay RL1 in the relay switch control circuit, and the pin 3 is connected with a live line input end L of the first voltage input end Vin 1;
the output terminal B1 of the common mode inductor LX1 includes a pin 1 and a pin 2.
7. The power adapter as claimed in claim 6, wherein the rectifying smoothing circuit comprises a rectifying bridge DB1, a diode D1, a diode D2 and an electrolytic capacitor C;
the rectifier bridge DB1 comprises pins 1-4, in the rectifier bridge DB1, the pin 2 and the pin 3 are respectively connected with the pin 1 and the pin 2 of the output end B1 of the common mode inductor LX1 in the electromagnetic interference filter circuit, and the pin 4 of the rectifier bridge DB1 is grounded;
the anode of the diode D1 is connected to the zero line input end N of the first voltage input end Vin1, the cathode of the diode D1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the pin 1 of the rectifier bridge DB1 and the first voltage output end V out1, the first voltage output end V out1 is connected to the anode of the electrolytic capacitor C, and the cathode of the electrolytic capacitor C is grounded.
8. The power adapter as claimed in claim 7, wherein the relay switch control circuit includes a control signal input terminal SS, a switching tube Q1, a switching tube Q2 and a relay RL 1;
the switch part A2 of the relay RL1 is arranged between a pin 4 of a common mode inductor LX1 in the electromagnetic interference filter circuit and a zero line input end N of a first voltage input end Vin1 in the alternating current input circuit;
the control signal input end SS is used for receiving a high-level or low-level relay switch control signal output by the standby detection control circuit;
the control signal input end SS is sequentially connected with a resistor R4 and a grid G of a switching tube Q2, a source S of the switching tube Q2 is respectively connected with a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are grounded;
the drain D of the switching tube Q2 is respectively connected with a resistor R2, a resistor R3, a capacitor C2 and a grid G of a diode Q1, the resistor R3 and the resistor C2 are grounded, and the source S of the diode Q1 is grounded;
the resistor R2 is connected with the total voltage output end Vout of the power adapter;
the drain D of the diode Q1 is connected with a resistor R1 and a section of an inductance part B2 in a relay RL1 in sequence, and the other end of the inductance part B2 in the relay RL1 is connected with the total voltage output end Vout of the power adapter.
9. The power adapter as claimed in claim 8, wherein the pulse width modulation circuit comprises a pulse width modulation chip IC1, the pulse width modulation chip IC1 comprising pins 1-8;
in the pulse width modulation chip IC1, the pin 1 is grounded, the pin 2 is respectively connected to the anode of an electrolytic capacitor C5 and the cathode of a diode D4, the cathode of the electrolytic capacitor C5 is grounded, and the anode of the diode D4 is connected to the voltage input terminal 1 of a transformer T1 in the transformer rectifier filter circuit;
the pin 3 is respectively connected with a capacitor C6 and a pin 1 of an optical coupler OP1 in the voltage transformation rectifying and filtering circuit;
the pin 4 is a hollow pin, the pin 5, the pin 6, the pin 7 and the pin 8 are connected, the pin 5 is respectively connected with the anode of the diode D3 and the voltage input terminal 3 of the transformer T1 in the transformer rectifier filter circuit, the cathode of the diode D3 is respectively connected with the capacitor C4 and the resistor R6, the capacitor C4 and the resistor R6 are connected with the voltage input terminal 4 of the transformer T1 in the transformer rectifier filter circuit, and the capacitor C4 and the resistor R6 are connected with the first voltage output terminal V out 1.
10. The power adapter as claimed in claim 9, wherein the transformer rectifier filter circuit comprises a transformer T1 and an optical coupler OP1, the voltage input terminal 2 of the transformer T1 is grounded and the voltage output terminal 6 is grounded;
the voltage output terminal 5 of the transformer T1 is respectively connected with the anode of a diode D5 and a capacitor C7, and the capacitor C7 is respectively connected with the cathode of a diode D5 and a total voltage output terminal Vout;
the total voltage output end Vout is connected with the anode of an electrolytic capacitor C8, and the cathode of the electrolytic capacitor C8 is grounded;
a pin 2 of the optical coupler OP1 is grounded, and a pin 4 of the optical coupler OP1 is sequentially connected with a resistor R8 and a total voltage output end Vout;
a pin 3 of the optical coupler OP1 is respectively connected with a pin 2 of an error amplifier IC2, a resistor R9 and a capacitor C9, the resistor R9 is connected with the total voltage output end Vout, and the capacitor C9 is sequentially connected with a resistor R10 and a pin 1 of the error amplifier IC 2;
the pin 3 of the error amplifier IC2 is grounded, and the pin 3 of the error amplifier IC2 is connected with the pin 2 of the optical coupler OP1 through a capacitor CY 1.
11. The power adapter as claimed in claim 10, wherein the standby detection control circuit includes a standby detection control chip IC3, the voltage detection terminal sense and the access voltage terminal VCC of the standby detection control chip IC3 are respectively connected to the total voltage output terminal Vout, and the ground terminal GND of the standby detection control chip IC3 is grounded;
the first voltage control signal output terminal out1 of the standby detection control chip IC3 is connected to the control signal input terminal SS of the relay switch control circuit.
12. The power adapter as claimed in claim 11, wherein the dc voltage output circuit comprises a transistor Q3, the emitter E of the transistor Q3 is grounded, the base B of the transistor Q3 is connected to a resistor R16, a resistor R15 and a capacitor C10, respectively, and the resistor R15 and the capacitor C10 are grounded;
the resistor R16 is connected to the second voltage control signal output terminal out2 of the standby detection control chip IC 3;
a collector C of the triode Q3 is respectively connected with a resistor R12 and a resistor R13, the resistor R13 is grounded, and the resistor R12 is sequentially connected with a resistor R11 and the total voltage output end Vout;
the connection node between the resistor R12 and the resistor R11 is also connected to pin 1 of the error amplifier IC 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510967730.3A CN106911255B (en) | 2015-12-22 | 2015-12-22 | Power adapter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510967730.3A CN106911255B (en) | 2015-12-22 | 2015-12-22 | Power adapter |
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| CN106911255A CN106911255A (en) | 2017-06-30 |
| CN106911255B true CN106911255B (en) | 2020-02-14 |
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| CN201510967730.3A Expired - Fee Related CN106911255B (en) | 2015-12-22 | 2015-12-22 | Power adapter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107294165A (en) * | 2017-07-10 | 2017-10-24 | 成都壹启科技有限公司 | Pressure swing type power supply unit protects system |
| CN110098604B (en) * | 2019-05-08 | 2021-06-29 | 上海松下微波炉有限公司 | Discharge circuit, power filter circuit, power supply circuit and household appliance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202353484U (en) * | 2011-11-29 | 2012-07-25 | 深圳市赛其创新科技有限公司 | Zero-power standby power source |
| CN102843051A (en) * | 2012-08-24 | 2012-12-26 | 天津三星电子有限公司 | Power adapter |
| CN102983762A (en) * | 2012-12-18 | 2013-03-20 | 天津三星电子有限公司 | Power supply of electrical equipment |
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2015
- 2015-12-22 CN CN201510967730.3A patent/CN106911255B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202353484U (en) * | 2011-11-29 | 2012-07-25 | 深圳市赛其创新科技有限公司 | Zero-power standby power source |
| CN102843051A (en) * | 2012-08-24 | 2012-12-26 | 天津三星电子有限公司 | Power adapter |
| CN102983762A (en) * | 2012-12-18 | 2013-03-20 | 天津三星电子有限公司 | Power supply of electrical equipment |
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