Circuit for reducing standby power consumption and switching power supply
By introducing a combination of a power module, a voltage divider module, a switch module and a control unit into a flyback switching power supply, and using a host computer control signal to quickly power off the switching power supply, the problem of high energy consumption in the standby state of the flyback switching power supply is solved, and a significant reduction in energy loss is achieved.
Patent Information
- Application Number
- CN202422893787.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing flyback switching power supplies cannot effectively reduce energy consumption in standby mode, resulting in continuous energy consumption.
By introducing a combination of a power supply module, a voltage divider module, a switch module, a second control unit and a first control unit, the second control unit receives the shutdown signal of the host computer, controls the switch module to turn on and quickly pulls down the AC power at the input end of the first control unit to achieve disconnection from the external load.
It effectively reduces the energy loss of the switching power supply in standby mode, achieving energy saving.
Smart Images
Figure CN223462923U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power electronics, in particular to a circuit for reducing standby power consumption and a switching power supply. BACKGROUND
[0002] With the rapid development of global economy, energy saving and emission reduction has been widely concerned by the public. As an important high-efficiency light-emitting material, light-emitting diode is widely used in the field of lighting. In normal operation, a single light-emitting diode generally withstands a voltage of 2-3 volts. When a plurality of light-emitting diodes are connected in parallel to form a lamp, the lamp is usually driven by a special switching power supply. However, with the intelligentization of household appliances, lamps also tend to be intelligent, which requires the switching power supply to realize lamp-off without cutting off the mains input. The switching power supply in the standby mode or sleep mode is still in the state of energy consumption, because the single-chip microcomputer and other power supply components in the switching power supply are in working state. Therefore, it is urgent to improve the internal circuit of the switching power supply to reduce the energy consumption of the switching power supply in standby state.
[0003] In related technologies, the switching power supply of the intelligent lamp is usually realized by a flyback switching power supply. In the flyback switching power supply, the gate voltage of a metal oxide semiconductor field effect transistor (MOS tube) is directly controlled by a control chip, and then the output of the transformer is controlled to realize intelligent control of the lamp.
[0004] However, when the lamp is controlled based on the related technology, the flyback switching power supply can only realize intelligent control of the lamp, and cannot reduce the energy consumption of the flyback switching power supply in standby state. UTILITY MODEL CONTENT
[0005] The purpose of the present application is to provide a circuit for reducing standby power consumption and a switching power supply, which can reduce the energy loss of the switching power supply in standby state.
[0006] Embodiments of the present application are implemented as follows:
[0007] In a first aspect, the present application provides a circuit for reducing standby power consumption, which comprises a power supply module, a voltage dividing module, a switching module, a first control unit and a second control unit.
[0008] The power supply module is connected with the first end of the voltage dividing module. The second end of the voltage dividing module is connected with the input end of the switching module and the input end of the first control unit respectively. The output end of the first control unit is used for connecting an external load. The output end of the switching module is grounded.
[0009] The output end of the second control unit is connected with the control end of the switch module, and the second control unit is also in communication connection with the upper computer;
[0010] The second control unit is used for sending a high-level signal to the control end of the switch module in response to a shutdown signal sent by the upper computer, so that the switch module pulls down the alternating current of the input end of the first control unit under the action of the high-level signal, and the first control unit is used for disconnecting the external load under the action of the pulled-down alternating current.
[0011] As an optional implementation manner, the switch module comprises a metal oxide semiconductor field effect transistor.
[0012] The gate of the metal oxide semiconductor field effect transistor is connected with the output end of the second control unit, the drain of the metal oxide semiconductor field effect transistor is connected with the second end of the voltage dividing module and the input end of the first control unit respectively, and the source of the metal oxide semiconductor field effect transistor is grounded.
[0013] As an optional implementation manner, the second control unit comprises a single-chip microcomputer.
[0014] The output end of the single-chip microcomputer is connected with the gate of the metal oxide semiconductor field effect transistor, and the single-chip microcomputer is also in communication connection with the upper computer.
[0015] As an optional implementation manner, the first control unit comprises a control chip.
[0016] The input end of the control chip is connected with the drain of the metal oxide semiconductor field effect transistor and the second end of the voltage dividing module respectively, and the output end of the control chip is used for connecting the external load.
[0017] As an optional implementation manner, the power module comprises an alternating current source and a rectifier bridge.
[0018] The positive pole of the alternating current source is connected with the first end of the rectifier bridge, the negative pole of the alternating current source is connected with the second end of the rectifier bridge, the third end of the rectifier bridge is connected with the first end of the voltage dividing module, and the fourth end of the rectifier bridge is grounded.
[0019] As an optional implementation manner, the rectifier bridge comprises a first diode, a second diode, a third diode and a fourth diode.
[0020] The input end of the first diode is connected with the output end of the fourth diode and the positive pole of the alternating current source respectively, and the output end of the first diode is connected with the first end of the voltage dividing module and the output end of the second diode respectively.
[0021] The input end of the second diode is connected with the output end of the third diode and the negative pole of the alternating current source, and the input end of the third diode and the input end of the fourth diode are grounded.
[0022] As an optional implementation, the voltage dividing module comprises a resistor.
[0023] One end of the resistor is connected to the third end of the rectifier bridge, and the other end of the resistor is connected to the drain of the metal oxide semiconductor field effect transistor and the input end of the control chip.
[0024] As an optional implementation, the circuit for reducing standby power consumption further comprises an absorption module.
[0025] One end of the absorption module is connected to the drain of the metal oxide semiconductor field effect transistor, and the other end of the absorption module is connected to the source of the metal oxide semiconductor field effect transistor and grounded.
[0026] As an optional implementation, the absorption module comprises a capacitor.
[0027] One end of the capacitor is connected to the drain of the metal oxide semiconductor field effect transistor, and the other end of the capacitor is connected to the source of the metal oxide semiconductor field effect transistor and grounded.
[0028] In a second aspect, the application provides a switching power supply comprising the circuit for reducing standby power consumption.
[0029] The application has the following beneficial effects:
[0030] The circuit for reducing standby power consumption provides stable voltage for each electronic device in the circuit for reducing standby power consumption through the power supply module, the voltage dividing module divides the power supply voltage provided by the power supply module and transmits the divided voltage signal to the switching module and the first control unit; the second control unit is used to receive the instruction issued by the upper computer in real time, and when the upper computer issues the shutdown signal to the second control unit, the second control unit applies the high-level signal to the control end of the switching module in response to the shutdown signal issued by the upper computer, and the switching module is turned on under the action of the high-level signal sent by the second control unit, and the switching module rapidly pulls down the alternating current at the input end of the first control unit after being turned on; the first control unit disconnects the connection with the external load when the alternating current at the input end is continuously low, so that the output of the switching power supply can be disconnected. In this way, the energy loss of the switching power supply in the standby state can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0031] In order to more clearly illustrate the technical solutions of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor.
[0032] Figure 1 A structure diagram of an existing flyback LED switching power supply;
[0033] Figure 2 A structure diagram of a circuit for reducing standby power consumption provided by the embodiment of the application;
[0034] Figure 3 A structure diagram of a switching module provided by the embodiment of the application;
[0035] Figure 4 A structure diagram of a second control unit provided by the embodiment of the application;
[0036] Figure 5 A structure diagram of a first control unit provided by the embodiment of the application;
[0037] Figure 6 A structure diagram of a power module provided by the embodiment of the application;
[0038] Figure 7 A structure diagram of a voltage dividing module provided by the embodiment of the application;
[0039] Figure 8 A structure diagram of another circuit for reducing standby power consumption provided by the embodiment of the application;
[0040] Figure 9 A voltage waveform diagram provided by the embodiment of the application;
[0041] Figure 10 A structure diagram of a flyback LED switching power supply provided by the embodiment of the application;
[0042] Figure 11 A structure diagram of a switching power supply provided by the embodiment of the application.
[0043] BRIEF DESCRIPTION OF DRAWINGS: 10: a circuit for reducing standby power consumption; 101: a power module; 1011: an AC source; 1012: a rectifier bridge; 121: a first diode; 122: a second diode; 123: a third diode; 124: a fourth diode; 102: a voltage dividing module; 1021: a resistor; 103: a switching module; 1031: a metal oxide semiconductor field effect transistor; 104: a second control unit; 1041: a single-chip microcomputer; 105: a first control unit; 1051: a control chip; 106: an absorbing module; 1061: a capacitor; 20: a switching power supply. DETAILED DESCRIPTION
[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be clearly and completely described the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.
[0045] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.
[0046] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0047] In the description of the present application, it should be noted that the terms "first", "second", "third", "fourth" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance. It should also be noted that, unless otherwise specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0048] At present, the switching power supply of intelligent lamp is often realized by flyback switching power supply. The flyback switching power supply directly controls the gate voltage of MOS tube through control chip, and then controls the output of transformer, to realize intelligent control of lamp. However, this scheme can only realize intelligent control of lamp, and cannot reduce the energy loss of flyback switching power supply in standby state.
[0049] To this end, the embodiment of the present application provides a circuit for reducing standby power consumption, which is composed of a power supply module, a voltage division module, a switch module, a second control unit and a first control unit, wherein the output end of the second control unit is connected with the control end of the switch module, the input end of the first control unit is connected with the input end of the switch module, the output end of the first control unit is used for connecting an external load, and the second control unit controls the conduction of the switch module under the action of a shutdown signal issued by an upper computer. After the switch module is turned on, the alternating current at the input end of the first control unit is rapidly pulled down. When the alternating current received at the input end of the first control unit is continuously low, the first control unit is disconnected with the external load. In this way, the effect of reducing the energy loss of the switching power supply in the standby state can be achieved.
[0050] Figure 1 It is a structural schematic diagram of an existing flyback LED switching power supply, referring to Figure 1 The traditional flyback LED switching power supply includes an alternating current source V1, a rectifier bridge BD1, a control chip XP3359 and an external load. The external load includes a switch Q1, a transformer T1, a diode D1, a capacitor C1, a switch Q2, a BUCK chip, a diode D2, an inductor L1, a capacitor C2 and a light emitting diode LED. The positive output end of the alternating current source V1 is connected with the first end of the rectifier bridge BD1, the second end of the rectifier bridge BD1 is connected with the first input end of the transformer T1, the negative output end of the alternating current source V1 is connected with the third end of the rectifier bridge BD1, the fourth end of the rectifier bridge BD1 is grounded, the output end of the control chip XP3359 is connected with the gate of the switch Q1, the source of the switch Q1 is grounded, the drain of the switch Q1 is connected with the second input end of the transformer T1, the first output end of the transformer T1 is connected with the input end of the diode D1, the second output end of the transformer T1 is grounded, the output end of the diode D1 is connected with one end of the capacitor C1 and the drain of the switch Q2, the gate of the switch Q2 is connected with the BUCK chip, the BUCK chip is connected with a single-chip microcomputer, the source of the switch Q2 is connected with the output end of the diode D2 and one end of the inductor L1, the other end of the inductor L1 is connected with one end of the capacitor C2 and the positive input end of the light emitting diode LED, the negative input end of the light emitting diode LED, the other end of the capacitor C2, the input end of the diode D2 and the other end of the capacitor C1 are all grounded.
[0051] Optionally, the traditional flyback LED switching power supply is often arranged in the secondary side of the transformer T1. Based on the electrical isolation of the transformer T1, the single-chip microcomputer cannot control the control chip XP3359. Even if the single-chip microcomputer receives the shutdown signal issued by the upper computer, the single-chip microcomputer can only control the shutdown of the BUCK chip in the subsequent circuit. The control chip XP3359 and the transformer T1 in the previous circuit are always in the working state. Although the current generated at this time is small, there is still 1W standby power consumption.
[0052] The circuit for reducing standby power consumption provided by the embodiment of the application is explained in detail below in combination with the drawings.
[0053] Figure 2 The structural schematic diagram of the circuit for reducing standby power consumption provided by the application can be applied to the switching power supply of the intelligent lamp, as shown in Figure 1 The circuit for reducing standby power consumption 10 provided by the embodiment of the application comprises a power module 101, a voltage dividing module 102, a switching module 103, a second control unit 104 and a first control unit 105.
[0054] Optionally, the power module 101 in the circuit for reducing standby power consumption 10 is mainly used for providing stable voltage for each electronic component in the circuit for reducing standby power consumption 10, the voltage dividing module 102 is used for dividing the voltage provided by the power module 101, the second control unit 104 communicates with the upper computer, and the second control unit 104 is used for sending high level to the switching module in response to the shutdown signal issued by the upper computer, the switching module 103 is used for entering the conduction state in response to the high level sent by the second control unit 104, the second control unit 104 controls the on-off of the switching module 103 to control the alternating current at the input end of the first control unit 105, the switching module 103 is turned on under the action of the high level sent by the second control unit 104 to rapidly pull down the alternating current at the input end of the first control unit 105, and the first control unit 105 disconnects the external load when the alternating current at the input end of the first control unit 105 is continuously low.
[0055] The power module 101 is connected with the first end of the voltage dividing module 102, the second end of the voltage dividing module 102 is connected with the input end of the switching module 103 and the input end of the first control unit 105 respectively, the output end of the first control unit 105 is used for connecting the external load, and the output end of the switching module 103 is grounded.
[0056] Optionally, the power module 101 provides stable and reliable power supply voltage to the circuit for reducing standby power consumption 10 through the first end of the voltage dividing module 102, the second end of the voltage dividing module 102 is connected with the input end of the switching module 103 and the input end of the first control unit 105, the voltage provided by the power module 101 is used for supplying power to the switching module 103 after being divided by the voltage dividing module 102, at the same time, the first control unit 105 samples the alternating current after being divided by the voltage dividing module 102 through the input end, and the output end of the switching module 103 is grounded to discharge the excess charge, thereby ensuring the safety and stability of the operation of the circuit for reducing standby power consumption 10.
[0057] Optionally, the input end of the first control unit 105 is also connected with the input end of the switch module 103, and the first control unit 105 detects the alternating current at the input end of the switch module 103 in real time via the input end, and turns on or off the connection with the external load based on the level change of the input end of the switch module 103. Wherein, the external load can be a smart lamp, or other electronic devices, which are not limited in the present application.
[0058] The output end of the second control unit 104 is connected with the control end of the switch module 103, and the second control unit 104 is also in communication connection with the host computer.
[0059] Optionally, the output end of the second control unit 104 is connected with the control end of the switch module 103, and the second control unit 104 applies a control signal to the control end of the switch module 103 via the output end, and the switch module 103 is turned on or off under the action of the control signal output by the output end of the second control unit 104.
[0060] Optionally, the second control unit 104 is also in communication connection with the host computer, and the second control unit 104 controls the on-off of the switch module 103 based on the instruction issued by the host computer, thereby controlling the alternating current at the input end of the first control unit 105.
[0061] The second control unit 104 is used to send a high-level signal to the control end of the switch module 103 in response to the shutdown signal sent by the host computer, so as to make the switch module 103 pull down the alternating current at the input end of the first control unit 105 under the action of the high-level signal, and the first control unit 105 is used to disconnect the connection with the external load under the action of the pulled-down alternating current.
[0062] Optionally, the shutdown signal is a signal for indicating that the switching power supply stops running, i.e. the state that the smart lamp is not used and the switching power supply does not need to supply power to the smart lamp. When the smart lamp is not used, the host computer sends a shutdown signal to the second control unit 104 based on the use state of the smart lamp, and the second control unit 104 sends a high-level signal to the switch module 103 in response to the shutdown signal issued by the host computer, and the switch module 103 is turned on under the control of the high-level signal. When the switch module 103 is turned on, the alternating current at the input end of the switch module 103 is quickly pulled down, the alternating current at the input end of the first control unit 105 is quickly pulled down to 0V, and the alternating current at the input end of the first control unit 105 is reduced to 0V. After the alternating current at the input end of the first control unit 105 is reduced to 0V, the first control unit 105 is disconnected with the load, and the switching power supply stops outputting electric energy.
[0063] In an embodiment of the present application, a power supply module provides a stable voltage for each electronic device in a circuit for reducing standby power consumption, a voltage divider module divides the supply voltage provided by the power supply module, and transmits the divided AC power to the switch module and the input end of the first control unit; the second control unit is used to receive an instruction issued by a host computer in real time, and when the host computer sends a shutdown signal to the second control unit, the second control unit responds to the shutdown signal issued by the host computer and applies a high-level signal to the control end of the switch module. The switch module is turned on under the action of the high-level signal sent by the second control unit. After the switch module is turned on, it quickly pulls down the AC power at the input end of the first control unit; when the AC power at the input end of the first control unit is continuously at a low level, the first control unit disconnects from the external load, thereby disconnecting the output of the switching power supply. In this way, the energy loss of the switching power supply in the standby state can be reduced.
[0064] Figure 3 This is a schematic diagram of the structure of a switch module provided in this application, see Figure 3 In a circuit 10 for reducing standby power consumption provided in an embodiment of the present application, a switch module 103 includes: a metal oxide semiconductor field effect transistor 1031.
[0065] As an optional implementation, see Figure 3 In the circuit 10 for reducing standby power consumption provided in an embodiment of the present application, the switch module 103 is implemented by a metal oxide semiconductor field effect transistor 1031, i.e., a MOS transistor. The switch module 103 can be implemented by either a PMOS transistor or an NMOS transistor. This application takes the switch module 103 as an NMOS transistor as an example, but this does not mean that the switch module 103 can only be implemented by an NMOS transistor. This application does not make any specific limitation on this.
[0066] The gate of the MOSFET 1031 is connected to the output terminal of the second control unit 104, the drain of the MOSFET 1031 is connected to the second terminal of the voltage divider module 102 and the input terminal of the first control unit 105, and the source of the MOSFET 1031 is grounded.
[0067] Optionally, the gate of the metal oxide semiconductor field effect transistor 1031 serves as the control end of the switch module 103, and the gate of the metal oxide semiconductor field effect transistor 1031 is connected to the output end of the second control unit 104, and the second control unit 104 controls the on and off of the metal oxide semiconductor field effect transistor 1031 via the output end.
[0068] Optionally, the drain of the metal oxide semiconductor field effect transistor 1031 is connected with the second end of the voltage division module 102 and the input end of the first control unit 105 respectively, that is, the drain of the metal oxide semiconductor field effect transistor 1031 serves as the input end of the switch module 103, and the input end of the first control unit 105 is used to acquire the drain voltage of the metal oxide semiconductor field effect transistor 1031 and judge whether the drain voltage of the metal oxide semiconductor field effect transistor 1031 continuously stays at a low level in real time, and when the drain voltage of the metal oxide semiconductor field effect transistor 1031 continuously stays at a low level, the first control unit 105 is disconnected with the external load.
[0069] Optionally, the source of the metal oxide semiconductor field effect transistor 1031 serves as the output end of the switch module 103, and the source of the metal oxide semiconductor field effect transistor 1031 is grounded.
[0070] It is worth noting that the metal oxide semiconductor field effect transistor 1031 contains a parasitic diode, which can effectively prevent the switch module 103 from being burned out by overvoltage, and the parasitic diode is mainly used to reverse breakdown before the metal oxide semiconductor field effect transistor 1031 is damaged by overvoltage, and directly guide the large current to the ground end, so as to achieve the purpose of protecting the operation safety of the switch module 103.
[0071] Figure 4 A structure schematic diagram of a second control unit provided in the application is shown in FIG. 4. Figure 4 The second control unit 104 in the circuit 10 for reducing standby power consumption provided in the embodiment of the application comprises a single-chip microcomputer 1041.
[0072] As an optional implementation, the second control unit 104 in the circuit 10 for reducing standby power consumption provided in the embodiment of the application can be realized by the single-chip microcomputer 1041. Figure 4 The single-chip microcomputer 1041 is used to control the gate-source voltage of the metal oxide semiconductor field effect transistor 1031 under the action of the shutdown signal issued by the host computer, so that the metal oxide semiconductor field effect transistor 1031 is turned on or turned off under the action of the single-chip microcomputer 1041. It is worth noting that the single-chip microcomputer 1041 can be regarded as a jump signal source in the circuit 10 for reducing standby power consumption, which is used to control the on-off of the metal oxide semiconductor field effect transistor 1031.
[0073] The output end of the single-chip microcomputer 1041 is connected with the gate of the metal oxide semiconductor field effect transistor 1031, and the single-chip microcomputer 1041 is also in communication connection with the host computer.
[0074] Optionally, an output end of the single-chip microcomputer 1041 is connected with a gate of the metal oxide semiconductor field effect transistor 1031, and the single-chip microcomputer 1041 is also in communication connection with the upper computer; after receiving a shutdown signal issued by the upper computer, the single-chip microcomputer 1041 sends a high-level signal to the gate of the metal oxide semiconductor field effect transistor 1031, and the metal oxide semiconductor field effect transistor 1031 is turned on under the action of the high-level signal; when the metal oxide semiconductor field effect transistor 1031 is turned on, the drain voltage of the metal oxide semiconductor field effect transistor 1031 is rapidly lowered, and the alternating current at the input end of the first control unit 105 is also rapidly lowered; after the alternating current at the input end of the first control unit 105 continuously becomes low, that is, after the alternating current at the input end of the first control unit 105 is lowered to 0V, the first control unit 105 is disconnected with the external load, the first control unit 105 stops running, and the first control unit 105 is in a standby state, so as to achieve the purpose of energy saving.
[0075] Figure 5 A structural schematic diagram of a first control unit provided in the application is shown in FIG. 1. Figure 5 The first control unit 105 in the circuit 10 for reducing standby power consumption provided in the embodiment of the application comprises a control chip 1051.
[0076] As an optional implementation, the first control unit 105 in the circuit 10 for reducing standby power consumption provided in the embodiment of the application can be realized by an XP3359 chip. Figure 5 The XP3359 chip is used as the control chip 1051, and the XP3359 chip has six pins. Among them, the Vin pin of the XP3359 chip is mainly used to obtain the drain voltage of the metal oxide semiconductor field effect transistor 1031, and the Vin pin of the XP3359 chip is always connected with the second port of the voltage dividing module 102, and the Vin pin of the XP3359 is used to obtain the alternating current after voltage division of the voltage dividing module 102.
[0077] Optionally, the six pins of the XP3359 chip are respectively a Vcc pin, a Vsns pin, a Vin pin, an Isns pin, a GND pin and an Out pin. Among them, the Vin pin is used to access the drain voltage of the metal oxide semiconductor field effect transistor 1031, monitor the change of the drain voltage of the metal oxide semiconductor field effect transistor 1031, and then quickly start or disconnect the connection between the external load.
[0078] The input end of the control chip 1051 is connected with the drain of the metal oxide semiconductor field effect transistor 1031 and the second port of the voltage dividing module 102 respectively, and the output end of the control chip 1051 is used to connect the external load.
[0079] Optionally, an input end of the control chip 1051 is connected with the drain of the metal oxide semiconductor field effect transistor 1031 and the second end of the voltage dividing module 102, wherein the second end of the voltage dividing module 102 is also used to indicate the output end of the voltage dividing module 102, and the first end of the voltage dividing module 102 is used to indicate the input end of the voltage dividing module 102. When the metal oxide semiconductor field effect transistor 1031 is turned on, the voltage dividing module 102 outputted voltage-divided alternating current is rapidly pulled down through the drain, and the control chip 1051 obtains the voltage-divided alternating current of the voltage dividing module 102 through the input end. When the alternating current sampled by the control chip 1051 through the input end is continuously low, the control chip 1051 is disconnected with the external load. The external load can be a smart lamp or other electronic components, which are not limited in the application.
[0080] Figure 6 A structural schematic diagram of a power module provided by the application is shown in Figure 6 The power module 101 in the circuit 10 for reducing standby power consumption provided by the embodiment of the application comprises an alternating current source 1011 and a rectifier bridge 1012.
[0081] The positive pole of the alternating current source 1011 is connected with the first end of the rectifier bridge 1012, the negative pole of the alternating current source 1011 is connected with the second end of the rectifier bridge 1012, the third end of the rectifier bridge 1012 is connected with the first end of the voltage dividing module 102, and the fourth end of the rectifier bridge 1012 is grounded.
[0082] Optionally, the power module 101 is used to provide an electric signal for the circuit 10 for reducing standby power consumption, and the power module 101 is realized by the alternating current source 1011 and the rectifier bridge 1012, wherein the alternating current source 1011 is used to generate alternating current, the positive pole of the alternating current source 1011 is connected with the first end of the rectifier bridge 1012, the negative pole of the alternating current source 1011 is connected with the second end of the rectifier bridge 1012, and the rectifier bridge 1012 is used to rectify and filter the alternating current generated by the alternating current source 1011 to provide a stable electric signal.
[0083] It is worth noting that the first end and the second end of the rectifier bridge 1012 are both used as the input end of the rectifier bridge 1012, the first end of the rectifier bridge 1012 is used to receive the positive pole alternating current outputted by the alternating current source 1011, the second end of the rectifier bridge 1012 is used to receive the negative pole alternating current outputted by the alternating current source 1011, the third end of the rectifier bridge 1012 is used as the output end of the rectifier bridge 1012, the rectifier bridge 1012 outputs the rectified and filtered power signal through the third end, and the fourth end of the rectifier bridge 1012 is used as the grounding end of the rectifier bridge 1012, and the rectifier bridge 1012 discharges the excess charge of the power module 101 through the fourth end.
[0084] Optionally, the output end of the rectifier bridge 1012 is connected with the voltage division module 102, and the voltage division module 102 divides the rectified alternating current output by the power supply module 101, so that the input end of the first control unit 105 obtains the voltage of the divided alternating current, which is maintained at a small level, thereby effectively preventing damage to the control chip 1051.
[0085] As an optional implementation, referring to Figure 6 The rectifier bridge 1012 in the circuit 10 for reducing standby power consumption provided by the embodiment of the application comprises a first diode 121, a second diode 122, a third diode 123 and a fourth diode 124.
[0086] The input end of the first diode 121 is connected with the output end of the fourth diode 124 and the positive pole of the alternating current source 1011 respectively, and the output end of the first diode 121 is connected with the first end of the voltage division module 102 and the output end of the second diode 122 respectively.
[0087] The input end of the second diode 122 is connected with the output end of the third diode 123 and the negative pole of the alternating current source 1011, and the input end of the third diode 123 and the input end of the fourth diode 124 are grounded.
[0088] Optionally, the rectifier bridge 1012 is a rectifier unit formed by connecting the first diode 121, the second diode 122, the third diode 123 and the fourth diode 124 in sequence, wherein the input end of the first diode 121 is connected with the positive pole of the alternating current source 1011, that is, the input end of the first diode 121 serves as the first end of the rectifier bridge 1012, and is used for receiving the positive alternating current generated by the alternating current source 1011; the output end of the first diode 121 and the output end of the second diode 122 are both connected with the first end of the voltage division module 102, that is, the output end of the first diode 121 and the output end of the second diode 122 both serve as the output end of the rectifier bridge 1012, the output end of the first diode 121 is used for outputting the positive rectified and filtered signal, and the output end of the second diode 122 is used for outputting the negative rectified and filtered signal; the input end of the second diode 122 is connected with the negative pole of the alternating current source 1011, that is, the input end of the second diode 122 serves as the second end of the rectifier bridge 1012, and is used for receiving the negative alternating current generated by the alternating current source 1011; the output end of the third diode 123 is connected with the negative pole of the alternating current source 1011, the output end of the fourth diode 124 is connected with the positive pole of the alternating current source 1011, the input end of the third diode 123 and the input end of the fourth diode 124 are grounded, and the input end of the third diode 123 and the input end of the fourth diode 124 both serve as the ground end of the rectifier bridge 1012, which can ensure the charge balance of the power supply module 101.
[0089] Figure 7A structure diagram of a voltage division module provided by the present application is shown in FIG. 1. Figure 7 The voltage division module 102 of the circuit 10 for reducing standby power consumption provided by the embodiment of the present application comprises a resistor 1021.
[0090] One end of the resistor 1021 is connected to the third end of the rectifier bridge 1012, and the other end of the resistor 1021 is connected to the drain of the metal oxide semiconductor field effect transistor 1031 and the input end of the control chip 1051 respectively.
[0091] Optionally, one end of the resistor 1021 is connected to the third end of the rectifier bridge 1012, and the resistor 1021 collects the alternating current signal rectified and filtered by the power module 101 via the third end of the rectifier bridge 1012. The resistor 1021 is usually implemented by a resistor with a large resistance value, and the resistance value of the resistor 1021 can be 6.0MΩ, 9.0MΩ, etc., which is not limited in the present application.
[0092] Optionally, the other end of the resistor 1021 is connected to the drain of the metal oxide semiconductor field effect transistor 1031 and the input end of the control chip 1051 respectively. The resistor 1021 and the pull-down resistor of the input end of the control chip 1051 together constitute a voltage division circuit. The resistor 1021 is used for dividing the voltage of the alternating current signal rectified by the rectifier bridge 1012 and transmitting the divided alternating current to the input end of the control chip 1051 and the drain of the metal oxide semiconductor field effect transistor 1031. When the metal oxide semiconductor transistor 1031 is turned on, the pull-down resistor of the input end of the control chip 1051 rapidly pulls down the alternating current of the input end of the control chip 1051. The pull-down resistor of the input end of the control chip 1051 is usually implemented by a resistor with a large resistance value, and the resistance value of the pull-down resistor of the input end of the control chip 1051 can be 25.7kΩ, 27kΩ, etc., which is not limited in the present application.
[0093] Optionally, the voltage rectified and output by the power module 101 is loaded to the input end of the control chip 1051 after passing through the resistor 1021 and the pull-down resistor of the input end of the control chip 1051, and the voltage at the input end of the control chip 1051 is a small value. When the resistance value R1 of the resistor 1021 is 6.0MΩ and the resistance value R2 of the pull-down resistor of the input end of the control chip 1051 is 25.7kΩ, the peak voltage of the alternating current obtained by the input end of the control chip 1051 during normal operation of the circuit for reducing standby power consumption is only 1.3V. In this way, the safety and stability of the operation of the control chip 1051 can be effectively protected.
[0094] Figure 8 Another structure diagram of a circuit for reducing standby power consumption provided by the present application is shown in FIG. 2. Figure 8 The circuit 10 for reducing standby power consumption provided by the embodiment of the present application further comprises an absorption module 106.
[0095] One end of the absorption module 106 is connected to the drain of the MOSFET 1031, and the other end of the absorption module 106 is connected to the source of the MOSFET 1031 and grounded.
[0096] Optionally, one end of the absorption module 106 is connected to the drain of the MOSFET 1031, and the other end of the absorption module 106 is connected to the source of the MOSFET 1031 and grounded. The absorption module 106 is used to absorb the spike voltage generated by the MOSFET 1031 at the on time or off time, which can effectively protect the safety and reliability of the operation of the control chip 1051.
[0097] As an optional embodiment, referring to Figure 8 The absorption module 106 in the circuit 10 for reducing standby power consumption provided by the embodiment of the present application comprises a capacitor 1061.
[0098] One end of the capacitor 1061 is connected to the drain of the MOSFET 1031, and the other end of the capacitor 1061 is connected to the source of the MOSFET 1031 and grounded.
[0099] Optionally, the absorption module 106 is realized by a non-polarity-distinguished capacitive component. The capacitor 1061 is used to absorb the spike voltage generated by the MOSFET 1031 at the on time or off time, thereby protecting the safety and reliability of the control chip 1051.
[0100] As an optional embodiment, Figure 9 A voltage waveform diagram provided by the embodiment of the present application is shown in Figure 9 After the circuit simulation of the circuit for reducing standby power consumption, it can be determined that the input end of the control chip 1051 is pulled low at the time of 50 milliseconds. At this time, the control chip 1051 turns off the output of the switching power supply, and only a small part of the power supply elements in the switching power supply are in working state. The overall standby power consumption of the switching power supply in the standby state is as low as about 0.25 W, which realizes the energy-saving purpose of reducing the standby power consumption of the switching power supply.
[0101] Figure 10 A structure schematic diagram of a flyback LED switching power supply provided by the embodiment of the present application is shown in Figure 10The application provides a flyback LED switching power supply composed of the above-mentioned circuit 10 for reducing standby power consumption and a rear-stage circuit.
[0102] Optionally, the flyback LED switching power supply provided by the application adopts two single-chip microcomputers 1 and 2, the single-chip microcomputer 1 is in communication connection with an upper computer through a DALI line, the single-chip microcomputer 1 is used for receiving a shutdown signal issued by the upper computer, after receiving the shutdown signal, the single-chip microcomputer 1 controls the metal oxide semiconductor field effect transistor 1031 to be turned on, the metal oxide semiconductor field effect transistor 1031 rapidly pulls down alternating current of a Vin pin of a control chip XP3359, the XP3359 outputs a low level to the switch Q1, the switch Q1 is controlled to be turned off, and the rear-stage circuit of the flyback LED switching power supply is turned off.
[0103] Optionally, the single-chip microcomputers 1 and 2 are arranged on two sides of the transformer T1 due to electrical isolation, the single-chip microcomputers 1 and 2 realize isolated communication through an isolation chip, the transformer T1, the switch Q1, the diode D1 and the capacitor C1 belong to a flyback topology in the flyback LED switching power supply, voltage on the capacitor C1 is about 70 V; the switch Q2, the diode D2, the inductor L1 and the capacitor C2 belong to a BUCK topology, and the single-chip microcomputer 2 is used for controlling on-off of the BUCK chip.
[0104] Optionally, the single-chip microcomputer 1 is supplied with power through a chip after the rectifier bridge 1012, even if the circuit of the flyback topology part is turned off, the normal operation of the single-chip microcomputer 1 is not affected. The single-chip microcomputer 2 is supplied with power from the capacitor C1 through a chip, when the circuit of the flyback topology part is turned off, the capacitor C1 loses voltage, and the single-chip microcomputer 2 also loses power supply, and thus the energy-saving purpose is achieved.
[0105] As an optional implementation manner, Figure 11 The switching power supply 20 provided by the application is shown in Figure 11 The switching power supply 20 provided by the application applies the above-mentioned circuit 10 for reducing standby power consumption, and the specific working principle of reducing standby power consumption is the same as that of the above-mentioned circuit, and the application does not make a redundant description here.
[0106] The above merely is a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
[0107] The above merely is a preferred embodiment of the present application, and is not used to limit the present application, and for those skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A circuit for reducing standby power consumption, characterized in that: The circuit for reducing standby power consumption comprises a power module, a voltage division module, a switch module, a first control unit and a second control unit; The power module is connected with the first end of the voltage division module, the second end of the voltage division module is connected with the input end of the switch module and the input end of the first control unit respectively, the output end of the first control unit is used for connecting an external load, and the output end of the switch module is grounded; The output end of the second control unit is connected with the control end of the switch module, and the second control unit is further connected with an upper computer in communication; The second control unit is used for sending a high-level signal to the control end of the switch module in response to a shutdown signal sent by the upper computer, so that the switch module pulls down the alternating current of the input end of the first control unit under the action of the high-level signal, and the first control unit is used for disconnecting the connection with the external load under the action of the pulled-down alternating current.
2. The circuit for reducing stand-by power consumption according to claim 1, wherein, The switch module comprises a metal oxide semiconductor field effect transistor; The gate of the metal oxide semiconductor field effect transistor is connected with the output end of the second control unit, the drain of the metal oxide semiconductor field effect transistor is connected with the second end of the voltage division module and the input end of the first control unit respectively, and the source of the metal oxide semiconductor field effect transistor is grounded.
3. The circuit for reducing standby power consumption according to claim 2, wherein, The second control unit comprises a single-chip microcomputer; The output end of the single-chip microcomputer is connected with the gate of the metal oxide semiconductor field effect transistor, and the single-chip microcomputer is further connected with the upper computer in communication.
4. The circuit for reducing stand-by power consumption according to claim 2, wherein The first control unit comprises a control chip; The input end of the control chip is connected with the drain of the metal oxide semiconductor field effect transistor and the second end of the voltage division module respectively, and the output end of the control chip is used for connecting an external load.
5. The circuit for reducing standby power consumption according to claim 1, wherein, The power module comprises an alternating current source and a rectifier bridge; The positive pole of the alternating current source is connected with the first end of the rectifier bridge, the negative pole of the alternating current source is connected with the second end of the rectifier bridge, the third end of the rectifier bridge is connected with the first end of the voltage division module, and the fourth end of the rectifier bridge is grounded.
6. The circuit for reducing standby power consumption according to claim 5, wherein, The rectifier bridge comprises a first diode, a second diode, a third diode and a fourth diode; The input end of the first diode is connected with the output end of the fourth diode and the positive pole of the alternating current source respectively, and the output end of the first diode is connected with the first end of the voltage division module and the output end of the second diode respectively; The input end of the second diode is connected with the output end of the third diode and the negative pole of the alternating current source, and the input end of the third diode and the input end of the fourth diode are both grounded.
7. The circuit for reducing standby power consumption according to claim 5, wherein The voltage division module comprises a resistor; One end of the resistor is connected with the third end of the rectifier bridge, and the other end of the resistor is connected with the drain of the metal oxide semiconductor field effect transistor and the input end of the control chip respectively.
8. The circuit for reducing standby power consumption according to claim 2, wherein, The circuit for reducing standby power consumption further comprises an absorption module; One end of the absorption module is connected with the drain of the metal oxide semiconductor field effect transistor, and the other end of the absorption module is connected with the source of the metal oxide semiconductor field effect transistor and grounded.
9. The circuit for reducing standby power consumption according to claim 8, wherein, The absorption module comprises a capacitor; One end of the capacitor is connected with the drain of the MOSFET, and the other end of the capacitor is connected with the source of the MOSFET and grounded.
10. A switching power supply, characterized by comprising: The switching power supply comprises the circuit for reducing standby power consumption according to any one of claims 1-9.