A power supply circuit and apparatus

Abstract

This application relates to the field of power supply technology, and in particular to a power supply circuit and device. The circuit includes: a neutral-live wire power supply module, a single live wire power supply module, and a load output port. The neutral-live wire power supply module and the single live wire power supply module are interconnected and respectively connected to the load output port. The neutral-live wire power supply module includes a first live wire port, a neutral wire port, and a voltage regulator chip. The voltage regulator chip is connected to the first live wire port and the neutral wire port. After power is connected to the first live wire port and the neutral wire port, the voltage regulator chip performs voltage regulation to supply power to the load through the load output port. The single live wire power supply module includes a second live wire port and a management chip. The second live wire port is connected to the management chip. After power is connected to the second live wire port, the management chip extracts DC voltage to supply power to the load through the load output port. The aim is to provide a power supply circuit that adapts to both neutral-live wire and single live wire configurations.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply circuit and device. Background Technology

[0002] In the fields of smart homes and electrical electronics, a stable power supply to switching devices is a core prerequisite for realizing their control functions. However, due to the differences in building wiring environments, the wiring configurations of existing switch boxes vary significantly: some boxes introduce both live and neutral wires, forming a stable power supply circuit through the live and neutral dual circuits; but in the renovation of old buildings or in certain simplified wiring scenarios, a large number of boxes only connect to the live wire, lacking an independent neutral wire circuit.

[0003] This difference in circuit configuration directly leads to compatibility issues with switching equipment: equipment suitable for live and neutral wire scenarios relies on both live and neutral circuits for power. If connected to a single live wire junction box, it will not work because it lacks a neutral wire and cannot form a complete power supply circuit. While traditional single live wire equipment can "borrow" power from the load circuit to maintain operation in single live wire scenarios, it often suffers from low power supply efficiency and poor load compatibility in live and neutral wire scenarios. Utility Model Content

[0004] The main objective of this application is to provide a power supply circuit and device that is adaptive to both live and neutral wire configurations, enabling it to stably draw power and drive the load to work normally in different wiring environments.

[0005] To achieve the above objectives, a first aspect of this application provides a power supply circuit, the circuit comprising: The system includes a neutral-live wire power supply module, a single live wire power supply module, and a load output port. The neutral-live wire power supply module and the single live wire power supply module are interconnected and connected to the load output port respectively. The live-neutral power supply module includes a first live wire port, a neutral wire port, and a voltage regulator chip. The voltage regulator chip is connected to the first live wire port and the neutral wire port. The live-neutral power supply module is used to regulate the voltage after the first live wire port and the neutral wire port are connected to the power supply, so as to supply power to the load through the load output port. The single live wire power supply module includes a second live wire port and a management chip. The second live wire port is connected to the management chip. After power is connected to the second live wire port, the management chip extracts DC voltage to supply power to the load through the load output port.

[0006] The circuit provided in the first aspect is compatible with various switch boxes that contain only a live wire or both a neutral and a live wire, ensuring that the switch can be installed smoothly. This feature not only significantly expands the applicability and promotion potential of smart switches, but also fundamentally eliminates the need for users to modify existing wiring during installation, effectively solving many inconveniences and additional costs caused by rewiring.

[0007] In one possible implementation, the neutral-live wire power supply module further includes a rectifier bridge unit. The first end of the rectifier bridge unit is connected to the voltage regulator chip, the third end of the rectifier bridge unit is connected to the first live wire port, and the fourth end of the rectifier bridge unit is connected to the neutral wire port. The rectifier bridge unit is used to convert the input bidirectional AC power into unidirectional DC power for the voltage regulator chip to perform voltage regulation.

[0008] In one possible implementation, the single live wire power supply module further includes a first diode, a first end of which is connected to the second live wire port, and a second end of which is connected to the management chip. The first diode is used to convert the input AC power into DC power, so that the management chip can extract DC voltage from the DC power.

[0009] In one possible implementation, the single live wire power supply module further includes an electrolytic capacitor connected between the first diode and the management chip, the electrolytic capacitor being used to filter out high-frequency ripple in the DC power output from the first diode.

[0010] In one possible implementation, the single live wire power supply module further includes a load detection unit. One end of the load detection unit is connected to the management chip, and the other end of the load detection unit is connected to the load output port. The load detection unit is used to detect the on / off state of the load and determine the power supply mode for powering the load based on the on / off state of the load.

[0011] In one possible implementation, the load detection unit includes a transistor, a first resistor, and a second resistor, wherein the transistor and the second resistor are connected in parallel between the management chip and the load output port, and the first resistor is connected between the transistor and the second resistor; The load detection unit is used to detect the on / off state of the load, and determines the power supply method for supplying power to the load based on the on / off state of the load, including: The transistor is used to detect the on / off state of the load, and turns on when the load is on, so that the DC voltage output by the management chip supplies power to the load, and turns off when the load is off; The first resistor and the second resistor are used to provide leakage current to keep the load in standby mode when the transistor is turned off.

[0012] In one possible implementation, the load detection unit further includes a second diode and a third diode, which are connected in parallel with the transistor. The second diode is used to prevent current from flowing back into the transistor when the transistor is turned on, and the third diode is used to prevent leakage current from flowing back into the load when the transistor is turned off.

[0013] In one possible implementation, the single live wire power supply module further includes a third resistor, a fourth resistor, and a first capacitor. The fourth resistor and the first capacitor are connected in parallel between the third resistor and the voltage regulator chip. The third resistor is also connected to the load detection unit.

[0014] In one possible implementation, the live and neutral power supply module further includes a varistor connected between the first live port and the neutral port to limit the voltage peak in the circuit within a preset safety range.

[0015] In a second aspect, an apparatus is provided that, when executed, implements a power supply circuit as described in any possible implementation of the first aspect.

[0016] The equipment provided in the second aspect is compatible with various switch boxes that contain only a live wire or both a neutral and a live wire, ensuring that the switch devices can be installed smoothly. This feature not only significantly expands the applicability and promotion potential of smart switches, but also fundamentally eliminates the need for users to modify the original wiring during installation, effectively solving many inconveniences and additional costs caused by rewiring.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in one or more embodiments or prior art of this specification, the accompanying drawings used in the description of one or more embodiments or prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a power supply circuit provided in an embodiment of this application; Figure 2This is a schematic diagram of a power supply circuit provided in an embodiment of this application. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described one or more embodiments are merely some embodiments of this specification, and not all embodiments. All other embodiments obtained by those skilled in the art based on one or more embodiments of this specification without creative effort should fall within the protection scope of this document.

[0021] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of a power supply circuit provided in an embodiment of this application. Figure 2This is a schematic diagram of a power supply circuit provided in an embodiment of this application. The circuit includes: a neutral-live wire power supply module 100, a single live wire power supply module 200, and a load output port. The neutral-live wire power supply module 100 and the single live wire power supply module 200 are interconnected and respectively connected to the load output port. The neutral-live wire power supply module 100 includes a first live wire port, a neutral wire port, and a voltage regulator chip U5. The voltage regulator chip U5 is connected to the first live wire port and the neutral wire port. After power is connected to the first live wire port and the neutral wire port, the voltage regulator chip U5 performs voltage regulation to supply power to the load through the load output port. The single live wire power supply module 200 includes a second live wire port and a management chip U3. The second live wire port is connected to the management chip U3. After power is connected to the second live wire port, the management chip U3 extracts DC voltage to supply power to the load through the load output port.

[0026] It should be noted that the power supply circuit includes a neutral-live wire power supply module 100, a single live wire power supply module 200, and a load output port. The neutral-live wire power supply module 100 and the single live wire power supply module 200 are interconnected and connected to the load output port respectively. The neutral-live wire power supply module 100 includes a first live wire port, a neutral wire port, and a voltage regulator chip U5. The voltage regulator chip U5 is connected to the first live wire port and the neutral wire port. The neutral-live wire power supply module 100 is used to regulate the voltage after the first live wire port and the neutral wire port are connected to the power supply. The voltage regulator chip U5 performs voltage regulation to supply power to the load through the load output port. That is, when the circuit is connected to the first live wire port and the neutral wire port, the neutral-live wire power supply module 100 starts. The voltage regulator chip U5 receives the AC voltage between the live wire and the neutral wire, and outputs a stable DC voltage through rectification, filtering, and voltage regulation. The DC voltage is then supplied to the load through the load output port. In this mode, the power supply current comes directly from the complete circuit formed by the live wire and the neutral wire. The power is sufficient and stable, which can support the continuous operation of high-power devices.

[0027] It should also be noted that the single-live-wire power supply module 200 includes a second live-wire port and a management chip U3. The second live-wire port is connected to the management chip U3. After power is connected to the second live-wire port, the management chip U3 extracts DC voltage to power the load through the load output port. That is, when the circuit is only connected to the second live-wire port and no neutral wire is connected, the single-live-wire power supply module 200 starts, and the management chip U3 extracts energy through the loop formed by the live wire and the load, processes it, and then powers the load through the load output port.

[0028] Furthermore, the neutral-live wire power supply module 100 and the single live wire power supply module 200 are interconnected, enabling automatic identification of wiring scenarios. When neutral wire voltage is detected, the neutral-live wire power supply module 100 is activated first; when no neutral wire is detected, it automatically switches to the single live wire power supply module 200. Both share the load output port, ensuring stable power supply to the load in different scenarios. This power supply circuit can be installed directly without rewiring, avoiding wall excavation and wiring modifications, and solving the problem of traditional power supply circuits being unusable due to wiring limitations.

[0029] The circuit provided in the first aspect is compatible with various switch boxes that contain only a live wire or both a neutral and a live wire, ensuring that the switch can be installed smoothly. This feature not only significantly expands the applicability and promotion potential of smart switches, but also fundamentally eliminates the need for users to modify existing wiring during installation, effectively solving many inconveniences and additional costs caused by rewiring.

[0030] In one possible implementation, such as Figure 2 As shown, the neutral and live wire power supply module 100 also includes a rectifier bridge unit BD1. The first end of the rectifier bridge unit BD1 is connected to the voltage regulator chip U5, the third end of the rectifier bridge unit BD1 is connected to the first live wire port, and the fourth end of the rectifier bridge unit BD1 is connected to the neutral wire port. The rectifier bridge unit BD1 is used to convert the input bidirectional AC power into unidirectional DC power for voltage regulation by the voltage regulator chip U5.

[0031] It should be noted that the neutral and live wire power supply module 100 also includes a rectifier bridge unit BD1. The first terminal of the rectifier bridge unit BD1 is connected to the voltage regulator chip U5, the third terminal of the rectifier bridge unit BD1 is connected to the first live wire port, and the fourth terminal of the rectifier bridge unit BD1 is connected to the neutral wire port. The rectifier bridge unit BD1 is used to convert the input bidirectional AC power into unidirectional DC power for voltage regulation by the voltage regulator chip U5. The specific rectification process is as follows: when the AC power is in the positive half-cycle, the current is turned on through a specific diode inside the rectifier bridge, flowing from the third terminal to the first terminal, and then returning to the fourth terminal through the load. When the AC power is in the negative half-cycle, the current is turned on through another set of diodes inside the rectifier bridge, still flowing from the third terminal to the first terminal, forming a unidirectional current. Through this full-wave rectification method, the rectifier bridge unit BD1 converts the alternating positive and negative AC power into a pulsating DC power with a constant direction, providing the basis for subsequent processing by the voltage regulator chip U5.

[0032] In one possible implementation, such as Figure 2As shown, the single live wire power supply module 200 also includes a first diode D1. The first end of the first diode D1 is connected to the second live wire port, and the second end of the first diode D1 is connected to the management chip U3. The first diode D1 is used to convert the input AC power into DC power, so that the management chip U3 can extract DC voltage from the DC power.

[0033] In some embodiments, it should be noted that the single live wire power supply module 200 also includes a first diode D1. The first end of the first diode D1 is connected to the second live wire port, and the second end of the first diode D1 is connected to the management chip U3. The first diode D1 is used to convert the input AC power into DC power, so that the management chip U3 can extract DC voltage from the DC power. Specifically, when the AC power is in the positive half-cycle, the current flows in from the second live wire port, the first diode D1 is forward-biased, and the current flows through the diode to the management chip U3. When the AC power is in the negative half-cycle, the first diode D1 is reverse-biased to block the current from flowing through. The unidirectional conductivity of the diode is used to filter out the effective half-cycle current, avoiding the ineffective consumption of the negative half-cycle current, and ensuring the limited power input of the live wire. The first diode D1 converts the alternating positive and negative AC power into unidirectional pulsating DC power containing only the positive half-cycle, providing a processable power source for the management chip U3. In addition, the first diode D1 can also prevent the negative half-cycle current from flowing back through its reverse cutoff characteristic, protecting the management chip U3 and other downstream components from reverse voltage surges, and improving the operational reliability of the single live wire power supply module 200.

[0034] In one possible implementation, the single live wire power supply module 200 further includes an electrolytic capacitor EC1, which is connected between the first diode D1 and the management chip U3. The electrolytic capacitor EC1 is used to filter out high-frequency ripple in the DC power output by the first diode D1.

[0035] It should be noted that the single-wire power supply module 200 also includes an electrolytic capacitor EC1. EC1 is connected between the first diode D1 and the management chip U3. EC1 is used to filter out high-frequency ripple in the DC output of the first diode D1. Since the first diode D1 converts AC to unidirectional pulsating DC through half-wave rectification, this DC is not smooth and stable, but contains a large amount of high-frequency ripple caused by residual AC waveforms. Therefore, the electrolytic capacitor EC1 is needed to filter out the high-frequency ripple. The specific filtering process is as follows: when the voltage of the pulsating DC increases, the electrolytic capacitor EC1 is charged and stores electrical energy; when the voltage decreases, the electrolytic capacitor EC1 discharges, releasing the stored electrical energy to compensate for the voltage drop. Through the dynamic balance of charging and discharging, the high-frequency ripple is smoothly filtered out, resulting in a more stable DC output, providing a clean input voltage for the management chip U3. By setting the electrolytic capacitor EC1 between the first diode D1 and the management chip U3, the high-frequency ripple after half-wave rectification is effectively filtered out, and the pulsating DC is converted into smooth DC, providing a stable input to the management chip U3 and ensuring that it can reliably extract voltage in a single-wire scenario, thus ensuring the normal operation of the load.

[0036] In one possible implementation, such as Figure 2 As shown, the single live wire power supply module 200 also includes a load detection unit 210. One end of the load detection unit 210 is connected to the management chip U3, and the other end of the load detection unit 210 is connected to the load output port. The load detection unit 210 is used to detect the on / off state of the load and determine the power supply mode for the load based on the on / off state of the load.

[0037] The live wire power supply module also includes a load detection unit 210. One end of the load detection unit 210 is connected to the management chip U3, and the other end is connected to the load output port. The load detection unit 210 is used to detect the on / off state of the load and determine the power supply mode for the load based on the on / off state of the load. The power supply mode is dynamically adjusted according to the on / off state of the load. When the load is on, it provides full power to ensure performance. When the load is off, it performs low-power standby to save energy. In scenarios where the power supply energy from a single live wire is limited, it maximizes the use of scarce power and extends the standby and working time of devices such as smart switches.

[0038] In one possible implementation, such as Figure 2As shown, the load detection unit 210 includes a transistor Q3, a first resistor R17, and a second resistor R18. The transistor Q3 and the second resistor R18 are connected in parallel between the management chip U3 and the load output port. The first resistor R17 is connected between the transistor Q3 and the second resistor R18. The load detection unit 210 is used to detect the on / off state of the load and determine the power supply mode for powering the load based on the on / off state of the load, including: the transistor Q3 is used to detect the on / off state of the load and conducts when the load is on, so that the DC voltage output by the management chip U3 supplies power to the load, and turns off when the load is off; the first resistor R17 and the second resistor R18 are used to provide leakage current to put the load in standby state when the transistor Q3 is off.

[0039] It should be noted that the load detection unit 210 includes a transistor Q3, a first resistor R17, and a second resistor R18. The transistor Q3 and the second resistor R18 are connected in parallel between the management chip U3 and the load output port. The first resistor R17 is connected between the transistor Q3 and the second resistor R18. The transistor Q3 is used to detect the on / off state of the load. It conducts when the load is on, so that the DC voltage output by the management chip U3 supplies power to the load. It is turned off when the load is off. The first resistor R17 and the second resistor R18 form a voltage divider network. On the one hand, it provides a suitable driving voltage range for the transistor Q3. On the other hand, it converts the working state of the transistor Q3 into an electrical signal that the management chip U3 can recognize. It is mainly used to provide leakage current to keep the load in standby state when the transistor Q3 is off. When the load output port forms a path with the load, transistor Q3 senses changes in current or voltage in the circuit. Its operating status is fed back to the management chip U3 through the first resistor R17 and the second resistor R18. After the management chip U3 recognizes the load connection signal, it can adjust the power supply parameters to ensure the load works normally. When the load circuit is disconnected, the operating status of transistor Q3 changes. The first resistor R17 and the second resistor R18 transmit this change to the management chip U3. After the management chip U3 recognizes the load disconnection, it switches to a low-power power supply mode, maintaining only the necessary detection circuit operation to avoid energy waste from single-wire power supply.

[0040] In one possible implementation, such as Figure 2 As shown, the load detection unit 210 further includes a second diode D3 and a third diode D4. The second diode D3 and the third diode D4 are connected in parallel with the transistor Q3. The second diode D3 is used to prevent current from flowing back into the transistor Q3 when the transistor Q3 is turned on, and the third diode D4 is used to prevent leakage current from flowing back into the load when the transistor Q3 is turned off.

[0041] It should be noted that the load detection unit 210 also includes a second diode D3 and a third diode D4. The second diode D3 and the third diode D4 are connected in parallel with transistor Q3. The second diode D3 prevents reverse current from flowing into transistor Q3 when Q3 is turned on, and the third diode D4 prevents leakage current from flowing into the load when Q3 is turned off. Specifically, the second diode D3 and the third diode D4 clamp and protect transistor Q3, limiting voltage fluctuations at the gate of transistor Q3, protecting it from voltage spikes, and simultaneously assisting in detecting voltage changes in the load circuit.

[0042] In one possible implementation, such as Figure 2 As shown, the single live wire power supply module 200 also includes a third resistor R15, a fourth resistor R16 and a first capacitor C21. The fourth resistor R16 and the first capacitor C21 are connected in parallel between the third resistor R15 and the voltage regulator chip U5. The third resistor R15 is also connected to the load detection unit 210.

[0043] It should be noted that the single-wire power supply module 200 also includes a third resistor R15, a fourth resistor R16, and a first capacitor C21. The fourth resistor R16 and the first capacitor C21 are connected in parallel between the third resistor R15 and the voltage regulator chip U5. The third resistor R15 is also connected to the load detection unit 210. Since the voltage after rectification by the first diode D1 may be too high, exceeding the voltage range that the pins of the management chip U3 can withstand, the voltage after rectification by the first diode D1 will pass through the voltage divider network composed of the third resistor R15 and the fourth resistor R16. This can adjust the voltage input to the pins of the management chip U3 to a suitable level, ensuring that the management chip U3 will not be damaged due to excessive voltage, while meeting the chip's input voltage requirements. In addition to voltage division, the third resistor R15 and the fourth resistor R16 can also limit the current, limiting the current flowing to the pins of the management chip U3, avoiding excessive current damage to the chip, and protecting the normal operation of the chip. In addition, current limiting also helps to reduce energy loss in the circuit and improve circuit stability. The first capacitor C21 primarily functions as a filter. In a single-wire power supply scenario, the DC current obtained after rectification by the first diode D1 is not completely smooth and contains high-frequency ripple and interference signals. The first capacitor C21 can filter out these high-frequency ripples and interference, making the voltage input to the management chip U3 smoother and more stable. This avoids the impact of high-frequency interference on the internal circuitry of the management chip U3, preventing the chip from malfunctioning or operating unstablely. In addition, the first capacitor C21 also has the characteristic of "blocking DC and passing AC". It has good conductivity for high-frequency AC signals, while acting as an open circuit for DC signals. The first capacitor C21 can bypass the high-frequency noise components in the input signal to ground, allowing the DC signal to pass smoothly, thereby stabilizing the input signal of the management chip U3 and enabling the management chip U3 to reliably perform signal conditioning, drive control, and other operations.

[0044] In one possible implementation, the live and neutral power supply module 100 further includes a varistor RV1 connected between the first live wire port and the neutral wire port to limit the voltage peak in the circuit within a preset safety range.

[0045] It should be noted that the live and neutral wire power supply module 100 also includes a varistor RV1, connected between the first live wire port and the neutral wire port, used to limit the voltage peak in the circuit within a preset safe range. The varistor RV1 is a voltage-sensitive resistor whose resistance changes significantly with the voltage across it. Under normal operating conditions, the voltage in the circuit is at its rated value, and the resistance of the varistor RV1 is very high, essentially an open circuit, having almost no impact on the normal power supply. The current mainly flows through other normal circuit components. When an overvoltage occurs in the circuit, such as a surge voltage caused by lightning strikes or the start-up or shutdown of large equipment in the power grid, the voltage between the live and neutral wires will rise instantaneously. When this voltage reaches the varistor RV1's varistor voltage, the resistance of the varistor RV1 will decrease sharply, rapidly changing from a high-resistance state to a low-resistance state. This makes the branch containing the varistor RV1 approximately a short circuit, allowing a large current to be discharged through the varistor RV1, thereby limiting the voltage peak in the circuit to a relatively low, preset safe range and preventing excessively high voltage from being applied to subsequent chips or other components. The voltage regulator chip U5 and rectifier bridge unit BD1 in the neutral-live wire power supply module 100 are highly sensitive to voltage. Excessively high voltage peaks may break down these components, leading to circuit damage. The varistor RV1 can effectively absorb and dissipate overvoltage energy, protecting these critical components from high-voltage surges, extending the lifespan of circuit components, and improving the reliability of the entire power supply module and intelligent switching circuit. Furthermore, by limiting voltage peaks, the varistor RV1 can reduce the impact of these unstable factors on the circuit, ensuring stable operation under various complex power grid environments and guaranteeing the circuit's proper functioning.

[0046] In a second aspect, an apparatus is provided that, when executed, implements a power supply circuit as described in any possible implementation of the first aspect.

[0047] The equipment provided in the second aspect is compatible with various switch boxes that contain only a live wire or both a neutral and a live wire, ensuring that the switch devices can be installed smoothly. This feature not only significantly expands the applicability and promotion potential of smart switches, but also fundamentally eliminates the need for users to modify the original wiring during installation, effectively solving many inconveniences and additional costs caused by rewiring.

[0048] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0049] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0050] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized by comprising: The circuit includes: The system includes a neutral-live wire power supply module, a single live wire power supply module, and a load output port. The neutral-live wire power supply module and the single live wire power supply module are interconnected and connected to the load output port respectively. The live-neutral power supply module includes a first live wire port, a neutral wire port, and a voltage regulator chip. The voltage regulator chip is connected to the first live wire port and the neutral wire port. The live-neutral power supply module is used to regulate the voltage after the first live wire port and the neutral wire port are connected to the power supply, so as to supply power to the load through the load output port. The single live wire power supply module includes a second live wire port and a management chip. The second live wire port is connected to the management chip. After power is connected to the second live wire port, the management chip extracts DC voltage to supply power to the load through the load output port.

2. The circuit of claim 1, wherein, The neutral and live wire power supply module also includes a rectifier bridge unit. The first end of the rectifier bridge unit is connected to the voltage regulator chip, the third end of the rectifier bridge unit is connected to the first live wire port, and the fourth end of the rectifier bridge unit is connected to the neutral wire port. The rectifier bridge unit is used to convert the input bidirectional AC power into unidirectional DC power for the voltage regulator chip to perform voltage regulation.

3. The circuit of claim 1, wherein, The single live wire power supply module also includes a first diode, the first end of which is connected to the second live wire port, and the second end of which is connected to the management chip. The first diode is used to convert the input AC power into DC power, so that the management chip can extract DC voltage from the DC power.

4. The circuit of claim 3, wherein, The single live wire power supply module also includes an electrolytic capacitor connected between the first diode and the management chip. The electrolytic capacitor is used to filter out high-frequency ripple in the DC power output by the first diode.

5. The circuit of claim 1, wherein, The single live wire power supply module also includes a load detection unit. One end of the load detection unit is connected to the management chip, and the other end of the load detection unit is connected to the load output port. The load detection unit is used to detect the on / off state of the load and determine the power supply mode for the load based on the on / off state of the load.

6. The circuit of claim 5, wherein, The load detection unit includes a transistor, a first resistor, and a second resistor. The transistor and the second resistor are connected in parallel between the management chip and the load output port, and the first resistor is connected between the transistor and the second resistor. The load detection unit is used to detect the on / off state of the load, and determines the power supply method for supplying power to the load based on the on / off state of the load, including: The transistor is used to detect the on / off state of the load, and turns on when the load is on, so that the DC voltage output by the management chip supplies power to the load, and turns off when the load is off; The first resistor and the second resistor are used to provide leakage current to keep the load in standby mode when the transistor is turned off.

7. The circuit of claim 6, wherein, The load detection unit further includes a second diode and a third diode, which are connected in parallel with the transistor. The second diode is used to prevent current from flowing back into the transistor when the transistor is turned on, and the third diode is used to prevent leakage current from flowing back into the load when the transistor is turned off.

8. The circuit of claim 6, wherein, The single live wire power supply module also includes a third resistor, a fourth resistor, and a first capacitor. The fourth resistor and the first capacitor are connected in parallel between the third resistor and the voltage regulator chip. The third resistor is also connected to the load detection unit.

9. The circuit according to claim 1, characterized in that, The live and neutral power supply module also includes a varistor connected between the first live wire port and the neutral wire port to limit the voltage peak in the circuit to a preset safe range.

10. An apparatus, comprising: The device includes the power supply circuit according to any one of claims 1-9.

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