CN112134460A - Low-power-consumption standby linear power circuit, control method and electric appliance - Google Patents
Low-power-consumption standby linear power circuit, control method and electric appliance Download PDFInfo
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- CN112134460A CN112134460A CN202010998005.3A CN202010998005A CN112134460A CN 112134460 A CN112134460 A CN 112134460A CN 202010998005 A CN202010998005 A CN 202010998005A CN 112134460 A CN112134460 A CN 112134460A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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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
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Abstract
The invention provides a low-power-consumption standby linear power supply circuit, a control method and an electric appliance. The voltage detection circuit detects the voltage value of the output voltage of the linear transformer, and the PWM signal is output through the second I/O port of the control chip to dynamically control the conduction/cut-off of the bidirectional thyristor module KC1 according to the voltage value of the output voltage, so that the live wire L at the input end of the linear transformer is in an interrupted conduction state, the no-load loss of an electric appliance is effectively reduced, and the standby power consumption of the linear power supply is less than 0.5W.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a low-power-consumption standby linear power supply circuit, a control method and an electric appliance.
Background
The standby power consumption refers to the energy consumption generated when the electric appliance is in a non-working state but is powered on. European Union regulations have clear requirements on standby power consumption of electric appliances, and some countries forcibly require that the standby power consumption is less than or equal to 0.5W.
The existing power supply of the electric appliance mostly adopts a switch power supply or a linear power supply, and the principles and the advantages and the disadvantages of the two power supplies are as follows:
1. the switching power supply is a power supply which maintains a stable output voltage by controlling the on/off time ratio of a power supply IC and a power MOSFET transistor through Pulse Width Modulation (PWM). The standby power consumption can be 0.5W under specific conditions, but the standby power consumption comprises a power supply IC, a high-frequency transformer, an RCD absorption loop, a feedback loop and the like, and the standby power consumption is complex in circuit, large in element number and high in cost.
2. The linear power supply reduces the voltage amplitude of alternating current through a linear transformer, and obtains direct current voltage through rectification, filtering and voltage stabilization. The circuit is simple, the number of elements is small, and the cost is lower than that of a switching power supply. But the structural characteristic of the silicon steel sheet is limited, and the no-load loss of the inner silicon steel sheet is more than 0.5W when 220V alternating current is input.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a low-power-consumption standby linear power supply circuit and a control method thereof, which can effectively reduce the no-load loss of an electric appliance and enable the standby power consumption of the linear power supply to be less than 0.5W.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a low power consumption standby linear power supply circuit, including a linear transformer, an input circuit and an output circuit connected to two ends of the linear transformer, where the input circuit includes a first connection circuit and a second connection circuit, the output circuit includes a voltage detection circuit, an input end of the first connection circuit is connected to a live line L, and a common end of the first connection circuit is connected to an input end of the second connection circuit, an output end of the first connection circuit is connected to an input end of the linear transformer, and a common end of the first connection circuit is connected to an output end of the second connection circuit, an input end of the voltage detection circuit is connected to an output end of the linear transformer, a first output end of the voltage detection circuit is connected to a three-terminal regulator V1, a control end of the first connection circuit is connected to a first I/O port of a control chip, a control end of the second connection circuit is connected to a second I/O port of, and the second output end of the voltage detection circuit is connected with the AD port of the control chip.
Further, the first connection circuit comprises a relay K1, one end of a coil of the relay K1 is connected with a +5V power supply, the other end of the coil of the relay K1 is connected with a first I/O port of a control chip, one end of a normally closed electric contact of the relay K1 is connected with a live wire L, and the other end of the normally closed electric contact of the relay K1 is connected with an input end of the linear transformer.
Further, the second connection circuit comprises a triac module KC1, a resistor R3, a resistor R4 and a conduction switch Q1, the input end of the triac module KC1 is connected with the live wire L, the output end of the triac module KC1 is connected with the input end of the linear transformer, one end of the control end of the triac module KC1 is connected with the +5V power supply, the other end of the control end of the triac module KC1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the input end of the conduction switch Q1, the output end of the conduction switch Q1 is grounded, and the control end of the conduction switch Q1 is connected with the second I/O port of the control chip.
Further, the voltage detection circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with one end of the output end of the linear transformer, the other end of the resistor R1 is connected with one end of the resistor R2, the common end of the resistor R2 is connected with the AD port of the control chip, and the other end of the resistor R2 is connected with the other end of the output end of the linear transformer.
Further, the output circuit further includes a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C2, a capacitor C3, a three-terminal regulator V1, a capacitor C4, and a capacitor C5, wherein the diode D1, the diode D2, the diode D3, and the diode D4 constitute a rectifier bridge, an input end of the rectifier bridge is connected to an output end of the linear transformer, an output end of the rectifier bridge is simultaneously connected to one end of the capacitor C2, one end of the capacitor C3, and a first port of the three-terminal regulator V1, the other end of the capacitor C2, the other end of the capacitor C3, and a second port of the three-terminal regulator V1 are all grounded, a third terminal of the three-terminal regulator V1 is connected to one end of the capacitor C4 and one end of the capacitor C5, and the other end of the capacitor C4 and the other end of the capacitor C5 are grounded.
Further, the three-terminal regulator V1 is specifically a 7805 voltage regulation module, and the on-switch Q1 is specifically a triode.
In a second aspect, the present invention further provides a control method for a low power consumption standby linear power supply circuit, where the control method is applied to the low power consumption standby linear power supply circuit of the first aspect, and the control method for the low power consumption standby linear power supply circuit includes a control method for a non-standby mode and a control method for a standby mode.
Further, the control method of the non-standby mode specifically includes: the relay K1 is closed to enable the linear transformer to be conducted, the output voltage of the linear transformer is rectified and filtered to obtain the output voltage VOUT, the VOUT is converted by the three-terminal voltage regulator V1 to obtain +5V direct-current voltage, the +5V direct-current voltage supplies power to the control chip, and the second I/O port outputs PWM signals to control whether the second communication circuit is conducted or not after the control chip is electrified.
Further, the control method of the standby mode specifically includes: the control chip outputs an electric signal through the first I/O port to enable the relay coil to be electrified, the linear transformer is disconnected, the capacitor C2 discharges slowly, the +5V direct-current voltage is obtained through conversion of the three-terminal voltage regulator V1 and is supplied to the main control chip, the main control chip obtains the voltage value of the output voltage VOUT, and the bidirectional thyristor module KC1 is dynamically controlled to be switched on/off according to the voltage value of the output voltage VOUT.
In a third aspect, the present invention further provides an electrical appliance, which includes a linear power supply, and further includes a low power consumption standby circuit of the linear power supply described in the first aspect.
The invention has the beneficial effects that: the invention provides a low-power-consumption standby linear power supply circuit, a control method and an electric appliance, wherein the low-power-consumption standby linear power supply circuit detects the voltage value of the output voltage of a linear transformer through a voltage detection circuit in a standby mode, and dynamically controls a bidirectional thyristor module KC1 to be switched on/off through a PWM signal output by a second I/O port of a control chip according to the voltage value of the output voltage, so that a live wire L at the input end of the linear transformer is in an intermittent conduction state, the no-load loss of the electric appliance is effectively reduced, and the standby power consumption of the linear power supply is smaller than 0.5W.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a first connection circuit of a low power consumption standby linear power supply circuit in an input circuit.
Fig. 2 is a schematic structural diagram of a second pass circuit of the low power consumption standby linear power supply circuit in an input circuit.
Fig. 3 is a schematic diagram of the voltage detection circuit of the low power consumption standby linear power supply circuit of the present invention in the output circuit.
Fig. 4 is a control flowchart of the control method of the low power consumption standby linear power supply circuit of the present invention in the standby mode.
Fig. 5 is a control flowchart of the control method of the low power consumption standby linear power supply circuit of the present invention in the non-standby mode.
Wherein the reference numbers are as follows: 10. the first connecting circuit, 20 the second connecting circuit, 30 the voltage detection circuit.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, the low power consumption standby linear power supply circuit of this embodiment includes a linear transformer, an input circuit and an output circuit connected to two ends of the linear transformer, the input circuit includes a first connection circuit 10 and a second connection circuit 20, the output circuit includes a voltage detection circuit 30, an input end of the first connection circuit 10 is connected to a live line L and a common end is connected to an input end of the second connection circuit 20, an output end of the first connection circuit 10 is connected to an input end of the linear transformer and a common end is connected to an output end of the second connection circuit 20, an input end of the voltage detection circuit 30 is connected to an output end of the linear transformer, a first output end of the voltage detection circuit 30 is connected to a three-terminal regulator V1, a control end of the first connection circuit 10 is connected to a first I/O port of a control chip, the control end of the second communication circuit 20 is connected to the second I/O port of the control chip, and the second output end of the voltage detection circuit 30 is connected to the AD port of the control chip.
The control chip may be any control chip having a logic control function and an I/O output port, for example: the CONTROL chip of this embodiment takes the MCU as an example for description, the RELAY-CONTROL terminal in this embodiment is connected to a first I/O port of the MCU, the PWM-CONTROL terminal is connected to a second I/O port of the MCU, and the AD-TEST is connected to an AD port of the MCU.
The three-terminal regulator V1 in this embodiment is specifically a 7805 voltage regulation module, and the minimum input voltage of the 7805 voltage regulation module in this embodiment is 7.5V.
The first communication circuit 10 and the second communication circuit 20 are both connected to enable the live wire L to be connected, so that the linear transformer is powered on, a first I/O port of the MCU controls the first communication circuit 10 to be connected/disconnected, a second I/O port of the MCU controls the second communication circuit 20 to be connected/disconnected, an AD port of the MCU acquires a voltage value of the output voltage of the linear transformer, and the first I/O port of the MCU controls the voltage output of the linear transformer in a non-standby mode; in the standby mode, the second I/O port of the MCU regulates the conduction time of the live wire according to the voltage value of the output voltage of the linear transformer acquired by the AD port, so that the live wire L at the input end of the linear transformer is in an interrupted conduction state, the no-load loss of an electric appliance is effectively reduced, and the standby power consumption of the linear power supply is smaller than 0.5W.
Specifically, in the present embodiment, the first connection circuit 10 includes a relay K1, one end of a coil of the relay K1 is connected to a +5V power supply, the other end of the coil of the relay K1 is connected to a first I/O port of the MCU, one end of a normally closed contact of the relay K1 is connected to the live line L, and the other end of the normally closed contact of the relay K1 is connected to the input terminal of the linear transformer.
The coil of the relay K1 of the first connection circuit 10 is controlled by the first I/O port of the MCU, when the first I/O port of the MCU outputs a high level, the coil of the relay K1 is not conducted, the normally closed contact of the coil of the relay K1 is closed, the live wire L normally supplies power for the linear transformer, when the first I/O port of the MCU outputs a low level, the coil of the relay K1 is conducted, the normally closed contact of the coil of the relay K1 is disconnected, the live wire L no longer supplies power for the linear transformer, the first I/O port of the MCU can control the conduction/cut-off of the first connection circuit 10 through the normally closed contact, and then the control line transformer is conducted/cut-off.
Specifically, the second communication circuit 20 includes a triac module KC1, a resistor R3, a resistor R4 and a conducting switch Q1, the input terminal of the triac module KC1 is connected to the live line L, the output terminal of the triac module KC1 is connected to the input terminal of the linear transformer, one end of the control terminal of the triac module KC1 is connected to the +5V power supply, the other end of the control terminal of the triac module KC1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the input terminal of the conducting switch Q1, the output terminal of the conducting switch Q1 is grounded, and the control terminal of the conducting switch Q1 is connected to the second I/O port of the MCU.
The conducting switch Q1 may be a transistor, a MOS transistor, an IGBT, etc., in this embodiment, an NPN transistor is taken as an example for description, and a control end of the transistor is connected to the second I/O port of the MCU through a current limiting resistor R5.
Whether the input end and the output end of the bidirectional thyristor module KC1 are conducted or not is determined by whether sufficient voltage difference exists between the two ends of the control end of the bidirectional thyristor module KC1 or not, when the triode is conducted, the control end of the bidirectional thyristor module KC1 is conducted, so that the input end and the output end of the bidirectional thyristor module KC1 are conducted, and the live wire L supplies power to the linear transformer; when the triode is cut off, the control end of the bidirectional thyristor module KC1 is conducted, and no voltage difference exists between the two ends of the control end of the bidirectional thyristor module KC1, so that the input end and the output end of the bidirectional thyristor module KC1 are cut off, and the live wire L does not supply power to the linear transformer; the base electrode of the triode is connected with the second I/O port of the MCU, and the emitting electrode of the triode is grounded, so that when the second I/O port of the MCU outputs a high level, the triode is conducted, the bidirectional thyristor module KC1 is conducted, and the live wire L supplies power for the linear transformer; when the second I/O port of the MCU outputs a low level, the triode is cut off, the bidirectional thyristor module KC1 is cut off, and the live wire L does not supply power to the linear transformer any more.
Specifically, the output circuit further includes a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C2, a capacitor C3, a 7805 voltage regulator module, a capacitor C4, and a capacitor C5, where the diode D1, the diode D2, the diode D3, and the diode D4 form a rectifier bridge, an input end of the rectifier bridge is connected to an output end of the linear transformer, an output end of the rectifier bridge is simultaneously connected to one end of the capacitor C2, one end of the capacitor C3, and a first port of the 7805 voltage regulator module, the other end of the capacitor C2, the other end of the capacitor C3, and a second port of the 7805 voltage regulator module are all grounded, a third end of the 7805 voltage regulator module is connected to one end of the capacitor C4 and one end of the capacitor C5, and the other end of the capacitor C4 and the other end of the capacitor C5 are grounded.
The rectifier bridge is used for converting alternating current of output of the linear transformer into direct current, the capacitor C2 is a large electricity storage capacitor and is used for discharging when the linear transformer is powered off, the capacitor C3, the capacitor C4 and the capacitor C5 are filter capacitors, and the output voltage VOUT of the linear transformer is converted into the direct current of +5V by the 7805 voltage stabilizing module and is used for supplying power to the MCU.
Specifically, the voltage detection circuit 30 includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to one end of the output end of the linear transformer, the other end of the resistor R1 is connected to one end of the resistor R2 and the common end is connected to the AD port of the MCU, and the other end of the resistor R2 is connected to the other end of the output end of the linear transformer.
The output voltage VOU of the linear transformer is rectified, filtered and then added to the two ends of the resistor R1 and the resistor R2, the AD port of the MCU collects the voltage value V-TEST of the resistor R2, and the voltage value of the output voltage VOU can be obtained according to the voltage division principle.
When the MCU collects the output voltage VOUT, a reference voltage Ua is set in the MCU and corresponds to a reference AD value a, a real-time AD value b of the V-TEST voltage is obtained by detecting an AD-TEST detection port of the MCU, and the real-time AD value b is compared with the reference AD value a and is calculated to obtain the corresponding V-TEST real-time voltage Ub; and then, calculating to obtain the real-time voltage Uv of VOUT according to the voltage division principle of the resistors R1 and R2, thereby realizing the dynamic monitoring of the VOUT voltage value and the voltage change amplitude.
The working principle of the embodiment is as follows: in a non-standby mode, the relay K1 is closed to enable the linear transformer to be conducted, the output voltage of the linear transformer is rectified and filtered to obtain the output voltage VOUT, meanwhile, the electricity storage capacitor C2 is fully charged, the VOUT is converted by the 7805 voltage stabilizing module to obtain +5V direct current voltage, the +5V direct current voltage supplies power to the MCU, and the MCU is powered on and outputs a PWM signal through the second I/O port to control whether the bidirectional thyristor module KC1 is conducted or not.
When the standby mode is entered, the first I/O port RELAY-CONTROL of the main CONTROL MCU outputs a low level signal, the coil of the RELAY K1 is energized, the normally closed contact of the RELAY K1 is opened, at this time, the first connecting circuit 10 and the second connecting circuit 20 of the live wire L are both opened, the linear transformer does not supply power, then the large storage capacitor C2 discharges slowly, the +5V dc voltage is obtained by conversion through the 7805 voltage stabilizing module, the MCU is supplied with the power, the MCU is energized and returns to normal operation, the real-time output voltage Uv of the linear transformer is obtained, because of different ac input voltages, the output voltage VOUT of the linear transformer has different values, in order to ensure more accurate CONTROL, the reduced amount of 10% (i.e. 0.9 Uv) is used for comparison with the pre-stored 9V reference judgment voltage, it should be noted that, because the minimum input voltage of the 7805 voltage stabilizing module is 7.5V, the 9V is selected as the reference judgment voltage after the margin is, the 7805 voltage stabilizing module V1 can be ensured to be always in a normal working state, the input voltage cannot be too low and fail, the conduction of the bidirectional thyristor module KC1 is dynamically controlled according to a comparison result, and the specific control mode is as follows:
(1) when 0.9Uv is larger than 9V, controlling the IO port PWM-CONTROL to send a PWM wave low level signal, the triode Q1 is not conducted, the bidirectional thyristor module KC1 is not conducted, the live wire L is not conducted, and the linear transformer is not powered;
(2) when 0.9Uv is less than 9V, the CONTROL IO port PWM-CONTROL sends a PWM wave high level signal, the triode Q1 is conducted, the triac KC1 is conducted, the live wire L is conducted through the second communication circuit 20, and the linear transformer recovers power supply.
According to the embodiment, the conduction state of the bidirectional thyristor module is dynamically controlled through pulse width modulation according to the real-time output voltage value of the linear transformer, so that a live wire L at the input end of the linear transformer is in an intermittent conduction state, intermittent power supply of the linear transformer is realized during standby, the no-load loss of the linear transformer during standby of an electric appliance is finally effectively reduced, and the standby power consumption of the linear power supply is less than 0.5W.
Embodiment 2, a method for controlling a low power consumption standby linear power circuit
As shown in fig. 4 to 5, the present embodiment provides a control method of a low power consumption standby linear power supply circuit, which is applied to the low power consumption standby circuit of the linear power supply described in embodiment 1, and the control method of the low power consumption standby linear power supply circuit includes a control method of a non-standby mode and a control method of a standby mode.
Specifically, the control method of the non-standby mode specifically includes: the relay K1 is closed to enable the linear transformer to be conducted, the output voltage of the linear transformer is rectified and filtered to obtain the output voltage VOUT, the VOUT is converted by the 7805 voltage stabilizing module to obtain +5V direct current voltage, the +5V direct current voltage supplies power to the MCU, and the MCU is powered on and outputs a PWM signal through the second I/O port to control whether the second communication circuit 20 is conducted or not.
Specifically, the control method of the standby mode specifically includes: the first I/O port of the MCU outputs an electric signal to enable the coil of the relay to be electrified, the linear transformer is disconnected, the capacitor C2 discharges slowly, the +5V direct-current voltage is obtained through conversion of the 7805 voltage stabilizing module and is supplied to the main control chip, the main control chip obtains the voltage value of the output voltage VOUT, and the bidirectional thyristor module KC1 is controlled to be switched on/off dynamically according to the voltage value of the output voltage VOUT.
Embodiment 3, an electrical appliance.
The embodiment also provides an electric appliance, which comprises a linear power supply and the low-power consumption standby circuit of the linear power supply described in the embodiment 1, wherein the standby power consumption of the electric appliance of the embodiment is less than 0.5W.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A low-power consumption standby linear power supply circuit comprises a linear transformer, an input circuit and an output circuit, wherein the input circuit and the output circuit are connected with two ends of the linear transformer, the input circuit comprises a first communicating circuit and a second communicating circuit, the output circuit comprises a voltage detection circuit, the input end of the first communicating circuit is connected with a live wire L, the common end of the first communicating circuit is connected with the input end of the second communicating circuit, the output end of the first communicating circuit is connected with the input end of the linear transformer, the common end of the first communicating circuit is connected with the output end of the second communicating circuit, the input end of the voltage detection circuit is connected with the output end of the linear transformer, the first output end of the voltage detection circuit is connected with a three-terminal regulator V1, the control end of the first communicating circuit is connected with a first I/O port of a control chip, the control end of the second communicating circuit is connected with a second I/O port, and the second output end of the voltage detection circuit is connected with the AD port of the control chip.
2. The linear power supply circuit with low power consumption and standby as claimed in claim 1, wherein the first connection circuit comprises a relay K1, one end of the coil of the relay K1 is connected to a +5V power supply, the other end of the coil of the relay K1 is connected to the first I/O port of the control chip, one end of the normally closed contact of the relay K1 is connected to the live wire L, and the other end of the normally closed contact of the relay K1 is connected to the input end of the linear transformer.
3. The linear power supply circuit with low power consumption and standby as claimed in claim 1, wherein the second connection circuit comprises a triac KC1, a resistor R3, a resistor R4 and a conducting switch Q1, an input terminal of the triac KC1 is connected to the live line L, an output terminal of the triac KC1 is connected to the input terminal of the linear transformer, one terminal of a control terminal of the triac KC1 is connected to the +5V power supply, the other terminal of the control terminal of the triac KC1 is connected to one terminal of the resistor R3, the other terminal of the resistor R3 is connected to one terminal of the resistor R4, the other terminal of the resistor R4 is connected to the input terminal of the conducting switch Q1, the output terminal of the conducting switch Q1 is grounded, and the control terminal of the conducting switch Q1 is connected to the second I/O port of the control chip.
4. The linear power supply circuit with low power consumption and standby as claimed in claim 1, wherein the voltage detection circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected to one end of the output terminal of the linear transformer, the other end of the resistor R1 is connected to one end of the resistor R2 and the common terminal is connected to the AD port of the control chip, and the other end of the resistor R2 is connected to the other end of the output terminal of the linear transformer.
5. The linear power supply circuit with low power consumption and standby as claimed in claim 1, the output circuit also comprises a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C2, a capacitor C3, a three-terminal regulator V1, a capacitor C4 and a capacitor C5, the diode D1, the diode D2, the diode D3 and the diode D4 form a rectifier bridge, the input end of the rectifier bridge is connected with the output end of the linear transformer, the output end of the rectifier bridge is simultaneously connected with one end of the capacitor C2, one end of the capacitor C3 and the first port of the three-terminal regulator V1, the other end of the capacitor C2, the other end of the capacitor C3 and the second port of the three-terminal regulator V1 are all grounded, the third end of the three-terminal voltage regulator V1 is connected with one end of the capacitor C4 and one end of the capacitor C5, and the other end of the capacitor C4 and the other end of the capacitor C5 are grounded.
6. The linear power supply circuit with low power consumption and standby as claimed in claim 1, wherein the three-terminal regulator V1 is a 7805 voltage regulation module, and the conducting switch Q1 is a triode.
7. A control method of a low power consumption standby linear power supply circuit is characterized in that the control method is applied to the low power consumption standby circuit of the linear power supply of any one of claims 1 to 6, and the control method of the low power consumption standby linear power supply circuit comprises a control method of a non-standby mode and a control method of a standby mode.
8. The method as claimed in claim 7, wherein the method for controlling the non-standby mode specifically comprises: the relay K1 is closed to enable the linear transformer to be conducted, the output voltage of the linear transformer is rectified and filtered to obtain the output voltage VOUT, the VOUT is converted by the three-terminal voltage regulator V1 to obtain +5V direct-current voltage, the +5V direct-current voltage supplies power to the control chip, and the second I/O port outputs PWM signals to control whether the second communication circuit is conducted or not after the control chip is electrified.
9. The method for controlling the low-power-consumption standby linear power supply circuit according to claim 7, wherein the method for controlling the standby mode specifically comprises: the control chip outputs an electric signal through the first I/O port to enable the relay coil to be electrified, the linear transformer is disconnected, the capacitor C2 discharges slowly, the +5V direct-current voltage is obtained through conversion of the three-terminal voltage regulator V1 and is supplied to the main control chip, the main control chip obtains the voltage value of the output voltage VOUT, and the bidirectional thyristor module KC1 is dynamically controlled to be switched on/off according to the voltage value of the output voltage VOUT.
10. An electrical appliance comprising a linear power supply, characterized in that it further comprises a low power consumption standby circuit of the linear power supply of any one of claims 1 to 8.
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| CN202010998005.3A CN112134460A (en) | 2020-09-21 | 2020-09-21 | Low-power-consumption standby linear power circuit, control method and electric appliance |
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| US20180254657A1 (en) * | 2017-03-05 | 2018-09-06 | Oather A McClung, Jr. | Zero energy loss efficient power supply responsive to connection state and utilization device control |
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| JP2001037079A (en) * | 1999-07-22 | 2001-02-09 | Hitachi Ltd | Power source circuit |
| CN103592869A (en) * | 2012-08-17 | 2014-02-19 | 美的集团股份有限公司 | Electronic device power supply control system and method |
| CN203014665U (en) * | 2012-11-30 | 2013-06-19 | 厦门华联电子有限公司 | A control circuit achieving zero stand-by power consumption |
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Application publication date: 20201225 |
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