Pure sine wave output circuit and device and power supply system

Abstract

The invention relates to a pure sine wave output circuit and device and a power supply system, the pure sine wave output circuit is applied to an LED lamp, and the pure sine wave output circuit comprises a power supply module, an energy storage module, a first controller, an LED driving module, an isolation boost module, a power regulation module and a second controller; wherein one end of the power supply module is used for being connected with commercial power, and the other end of the power supply module is connected with the LED lamp through the energy storage module, the isolation boosting module and the power adjusting module in sequence; the first controller is respectively connected with the power supply module and the energy storage module, and the first controller is also connected with the LED lamp through the LED driving module; the second controller is respectively connected with the isolation boosting module and the power adjusting module; the first controller is used for controlling the LED driving module to drive the LED lamp to work under the condition that the mains supply is disconnected; the second controller is used for adjusting the output power of the power adjusting module. The pure sine wave output circuit can adapt to an inductive load, a capacitive load or a resistive load, and circuit interference can be better avoided.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a pure sine wave output circuit, device and power supply system. Background Art

[0002] In the field of emergency power supply, in the traditional pure sine wave output emergency power supply design, a single microcontroller (MCU) is responsible for the operation of the emergency conversion control circuit and the SPWM modulation circuit at the same time, resulting in the emergency conversion control circuit and the SPWM modulation circuit sharing the same ground and not being effectively isolated from the emergency battery, leading to serious circuit interference. Especially when the battery voltage fluctuates, the constant power control becomes extremely unstable and the power output deviation increases significantly.

[0003] Based on this, it is necessary to provide an emergency power supply design that can avoid circuit interference. Summary of the invention

[0004] Based on this, it is necessary to provide a pure sine wave output circuit, device and power supply system that can avoid circuit interference.

[0005] In a first aspect, the present application provides a pure sine wave output circuit, which is applied to LED lamps. The pure sine wave output circuit includes a power supply module, an energy storage module, a first controller, an LED driving module, an isolation boost module, a power regulation module, and a second controller;

[0006] Among them, one end of the power supply module is used to connect to the mains, and the other end of the power supply module is connected to the LED lamp via the energy storage module, the isolation boost module and the power regulation module in sequence; the first controller is connected to the power supply module and the energy storage module respectively, and the first controller is also connected to the LED lamp via the LED driving module; the second controller is connected to the isolation boost module and the power regulation module respectively;

[0007] The first controller is used to control the LED driving module to drive the LED lamp to work when the mains power is disconnected; the second controller is used to adjust the output power of the power adjustment module.

[0008] In one of the embodiments, the isolated boost module includes a switching power supply control circuit, a boost circuit, an isolation transformer, a photoelectric coupling circuit and a full-wave rectifier filter circuit;

[0009] The energy storage module is connected to the power regulation module via the switching power supply control circuit, the boost circuit, the isolation transformer and the full-wave rectifier filter circuit in sequence; the photoelectric coupling circuit is connected between the switching power supply control circuit and the boost circuit.

[0010] In one of the embodiments, the power regulation module includes a bridge rectifier circuit, a filter circuit and a drive circuit;

[0011] The isolated boost module is connected to the LED lamp via a bridge rectifier circuit and a filter circuit in sequence; and the drive circuit is connected between the second controller and the bridge rectifier circuit.

[0012] In one of the embodiments, the pure sine wave output circuit further includes a first sampling module;

[0013] The first sampling module is connected between the filter circuit and the first controller, and is used to collect the output current of the filter circuit.

[0014] In one embodiment, the first sampling module includes a Hall current sensor and an operational amplifier circuit;

[0015] The filter circuit is connected to the first controller via the Hall current sensor and the operational amplifier circuit in sequence.

[0016] In one of the embodiments, the pure sine wave output circuit further includes a second sampling module and a third sampling module;

[0017] Among them, the second sampling module is connected between the second controller and the filter circuit, and the second sampling module is used to collect the output voltage of the filter circuit; the third sampling module is connected between the second controller and the rectifier circuit, and the third sampling module is used to collect the output current of the rectifier circuit.

[0018] In one of the embodiments, the pure sine wave output circuit further includes an energy storage module voltage monitoring module;

[0019] Among them, the energy storage module voltage monitoring module is connected between the energy storage module and the first controller.

[0020] In one of the embodiments, the pure sine wave output circuit further includes a first voltage stabilizing circuit and a second voltage stabilizing circuit;

[0021] The first voltage stabilizing circuit is connected between the power supply module and the first controller; the second voltage stabilizing circuit is connected between the isolation boost module and the second controller.

[0022] In a second aspect, the present application further provides a pure sine wave output device, which includes a housing and the pure sine wave output circuit in the above embodiment, and the pure sine wave output circuit is arranged in the housing.

[0023] In a third aspect, the present application further provides a power supply system, which includes a mains power supply device and the pure sine wave output device in the above embodiment, wherein the mains power supply device is used to transmit mains power to the pure sine wave output device.

[0024] The above pure sine wave output circuit, device and power supply system have at least the following beneficial effects:

[0025] By introducing a dual-controller architecture and modular design, the problems of signal distortion and unstable power control caused by battery voltage fluctuations and current changes are solved. Specifically, the independent operation of the first controller and the second controller avoids the signal interference caused by the shared reference level between the emergency conversion control and the SPWM modulation circuit in the traditional single MCU solution. The second controller is based on an isolated boost module. Through precise control of the power regulation module, it effectively isolates the direct impact of transient battery voltage changes and current spikes on sensitive control circuits, significantly reduces electromagnetic interference, and ensures the high quality and stability of the output AC sine wave. At the same time, the electrical isolation characteristics of the isolated boost module further enhance the signal purity, avoid mutual interference between different control links, and realize precise adjustment of the power output of LED lamps. Whether in normal power supply or power outage emergency, the signal can be kept clear and stable, thereby greatly improving the working reliability and energy efficiency of LED lamps in complex environments, and opening up a new path for the design of high-performance, low-interference LED lighting systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 Schematic diagram of the structure of a pure sine wave output circuit in one embodiment;

[0028] Figure 2 is a schematic diagram of the structure of a first controller in an embodiment;

[0029] Figure 3 is a schematic diagram of the structure of a second controller in one embodiment;

[0030] Figure 4 is a schematic diagram of the structure of a power supply module in an embodiment;

[0031] Figure 5 is a schematic structural diagram of a discharge switch circuit in one embodiment;

[0032] Figure 6 is a structural schematic diagram of a constant power output circuit and an output current calculation circuit in one embodiment;

[0033] Figure 7 is a schematic structural diagram of a first voltage stabilizing circuit in an embodiment;

[0034] Figure 8is a schematic structural diagram of a second voltage stabilizing circuit in one embodiment;

[0035] Fig. 9 It is a structural schematic diagram of an isolation boost module in one embodiment;

[0036] Fig.10a Schematic diagram of the structure of a bridge rectifier filter circuit in one embodiment;

[0037] Fig.10b is a schematic structural diagram of a driving circuit in one embodiment;

[0038] Fig.11 is a schematic diagram of the structure of a first sampling module and a second sampling module in an embodiment;

[0039] Fig.12 is a schematic structural diagram of a third sampling module in an embodiment;

[0040] Fig.13 is a schematic diagram of the structure of a voltage monitoring circuit for an energy storage module in one embodiment;

[0041] Fig.14 FIG. 1 is a schematic diagram of the structure of a burn-in recovery circuit in an embodiment. DETAILED DESCRIPTION

[0042] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0045] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0046] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0047] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0048] In an exemplary embodiment, Figure 1 As shown, the present application provides a pure sine wave output circuit, which is applied to an LED lamp 900. The pure sine wave output circuit includes a power supply module 2, an energy storage module 4, a first controller 6, an LED driver module 8, an isolation boost module 10, a power regulation module 12 and a second controller 14; wherein, one end of the power supply module 2 is used to access the mains, and the other end of the power supply module 2 is connected to the LED lamp 900 via the energy storage module 4, the isolation boost module 10 and the power regulation module 12 in sequence; the first controller 6 is connected to the power supply module 2 and the energy storage module 4 respectively, and the first controller 6 is also connected to the LED lamp 900 via the LED driver module 8; the second controller 14 is connected to the isolation boost module 10 and the power regulation module 12 respectively; the first controller 6 is used to control the LED driver module 8 to drive the LED lamp 900 to work when the mains is disconnected; the second controller 14 is used to adjust the output power of the power regulation module 12.

[0049] In a specific embodiment, the first controller 6 can be selected as follows: Figure 2 The MCU (SM8F570212S) shown in FIG. 1 and the second controller 14 can be selected as follows: Figure 3 The MCU (MM32F0010A1T) shown in FIG. 1 is a power supply module 2. Based on this, the power supply module 2 may be a power supply module 2 composed of Figure 4The AC-DC charging circuit 22, the transformer 24, the mains voltage detection circuit 26 and the charging switch circuit 28 shown are composed. The output end (VDC_V) of the mains voltage detection circuit 26 is connected to the first controller 6 to transmit the detection result (whether the mains is disconnected) to the first controller 6; the controlled end (BAT_ON2) of the charging switch circuit 28 is also connected to the first controller 6 to control whether the power supply module 2 charges the energy storage module 4. On this basis, a discharge switch circuit 300 can be further provided between the energy storage module 4 and the isolation boost module 10 to control the discharge of the energy storage module 4. In a specific embodiment, the discharge switch circuit 300 can be as follows Figure 5 In the circuit shown in FIG. 1 , the controlled end (BAT_ON1) of the discharge switch circuit 300 is connected to the first controller 6. The LED driving module 8 may refer to a circuit module for driving the LED lamp 900 in an emergency when the mains is disconnected. For example, in a specific embodiment, when the first controller 6 is an MCU (SM8F570212S), the LED driving module 8 may refer to a circuit module composed of Figure 6 The output current calculation circuit 82 and the constant power output circuit 84 shown in FIG. Figures 2 to 6 The various circuit structures and device selections shown in the figure are only for illustration and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known by those skilled in the art from the figure and will not be repeated here. The energy storage module 4 may refer to a battery. The isolation boost module 10 may refer to a circuit module that uses an electrically isolated structure for boosting, and is used to boost the low-voltage direct current output by the energy storage module 4 to high-voltage direct current. The power regulation module 12 may refer to a circuit module that adjusts the output voltage and output current based on the above-mentioned high-voltage direct current through electronic components such as power switching tubes to output appropriate power to the LED lamp 900, so that the LED lamp 900 operates at rated power.

[0050] Exemplarily, in the original pure AC sine wave output emergency power supply design, only a single microcontroller (MCU) is used as the core control unit, and the MCU is responsible for the operation of the emergency conversion control and the SPWM modulation circuit at the same time. The inventor has found through research that this design causes the emergency output and the SPWM modulation circuit to share the same ground, which means that the two share the same reference level, which lacks proper electrical isolation when powered by a battery. During the emergency conversion and modulation process, the voltage fluctuation and current change of the battery will directly affect the operation of the SPWM modulation circuit, causing signal distortion and instability, thereby affecting the quality of the output AC sine wave and increasing interference. In addition, since the MCU is directly connected to the battery and there is no effective isolation, the transient voltage change and current spike of the battery can be easily transmitted directly to the sensitive control circuit, causing serious electromagnetic interference (EMI), affecting the stability and accuracy of the constant power circuit, resulting in a large deviation in the power output and the inability to accurately control the power output. Based on the above reasons, the above-mentioned pure sine wave output circuit is provided to solve the above problems. The power supply module 2 is connected to and preliminarily processes the mains power, and the fluctuations and noise of the power grid are isolated. The power supply module 2, under the control of the first controller 6, realizes the charging control of the energy storage module 4, for example, the charging can be stopped when the energy storage module 4 is full. Among them, the first controller 6 can draw power from the energy storage module 4 through the power supply module 2 to ensure that the first controller 6 is always in working state when the mains power is disconnected. The first controller 6 can detect whether the mains power is disconnected through the power supply module 2. When it is detected that the mains power is suddenly disconnected, the first controller 6 can quickly start the LED drive module 8 by outputting a PWM signal, so that the LED lamp 900 is first lit in an environment where the mains power is missing. On this basis, the first controller 6 controls the energy storage module 4 to discharge based on the connection with the energy storage module 4, and outputs the electric energy stored in the energy storage module 4 to the isolation boost module 10. The second controller 14 draws power from the isolation boost module 10, and then, under the control of the second controller 14, converts the electric energy stored in the energy storage module 4 into an output voltage and output current that matches the rated working current and working voltage of the LED lamp 900 through the isolation boost module 10 and the power regulation module 12, ensuring that the lamp is properly supplied with electric energy regardless of the low-brightness energy-saving mode or the high-brightness fully-on state. In the above process, based on the electrical isolation of the isolation boost module 10, the direct connection between the second controller 14 and the battery is avoided, and the fluctuation of power output caused by the voltage fluctuation and current change of the battery is avoided. At the same time, the second controller 14 is avoided from being connected to the battery together with the first controller 6, and the signal interference between the two controllers is avoided, further avoiding the fluctuation of power output caused by the voltage fluctuation and current change of the battery.It should be noted that when the AC power is not disconnected, the second controller 14 is also used to adjust the output power of the power regulation module 12 so that the output voltage and output current corresponding to the output power of the power regulation module 12 match the rated operating current and operating voltage of the LED lamp 900.

[0051] The above-mentioned pure sine wave output circuit solves the problems of signal distortion and unstable power control caused by battery voltage fluctuation and current change by introducing dual controller architecture and modular design. Specifically, the independent operation of the first controller and the second controller avoids the signal interference caused by the shared reference level of the emergency conversion control and SPWM modulation circuit in the traditional single MCU solution. The second controller is based on the isolated boost module. Through the precise control of the power regulation module, it effectively isolates the direct impact of the transient voltage change and current spike of the battery on the sensitive control circuit, significantly reduces electromagnetic interference, and ensures the high quality and stability of the output AC sine wave; at the same time, the electrical isolation characteristics of the isolated boost module further enhance the signal purity, avoid mutual interference between different control links, and realize precise adjustment of the power output of the LED lamp. Whether in normal power supply or power outage emergency, the signal can be kept clear and stable, thereby greatly improving the working reliability and energy efficiency performance of the LED lamp in complex environments, and opening up a new path for the design of high-performance, low-interference LED lighting systems.

[0052] In an exemplary embodiment, the pure sinusoidal wave output circuit further includes a first voltage stabilizing circuit 16 and a second voltage stabilizing circuit 18 ; wherein the first voltage stabilizing circuit 16 is connected between the power supply module 2 and the first controller 6 ; and the second voltage stabilizing circuit 18 is connected between the isolation boost module 10 and the second controller 14 .

[0053] The first voltage stabilizing circuit 16 can draw power from the energy storage module 4 through the power supply module 2 to provide regulated power to the first controller 6 ; the second voltage stabilizing circuit 18 can draw power from the isolation boost module 10 to provide regulated power to the second controller 14 .

[0054] For example, in a specific embodiment, the first controller 6 is selected as follows Figure 2 When the MCU (SM8F570212S) shown in FIG. 1 is used, the corresponding first voltage stabilizing circuit 16 may be as follows: Figure 7 The circuit shown; the selection of the second controller 14 is as follows Figure 3 When the MCU (MM32F0010A1T) shown in FIG. 1 is used, the corresponding second voltage stabilizing circuit 18 may be as follows: Figure 8 The circuit shown in the figure needs to be explained. Figure 7 and Figure 8The circuit structures and device selections shown in the figure are only for illustration and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known by those skilled in the art from the figure and will not be repeated here.

[0055] In this embodiment, the introduction of the first voltage stabilizing circuit and the second voltage stabilizing circuit provides a stable and reliable power supply for the first controller and the second controller respectively, effectively eliminates the signal interference caused by power supply voltage fluctuation or transient, and ensures the purity and accuracy of the control signal; specifically, the first voltage stabilizing circuit obtains electric energy from the energy storage module and performs voltage stabilization processing, thereby providing the first controller with a stable working voltage that is not affected by changes in the external power supply. Even under extreme conditions where the mains is disconnected or fluctuates, the normal operation of the first controller can be guaranteed, ensuring the timely response and stable lighting of the LED lamp in an emergency state; similarly, the second voltage stabilizing circuit is connected between the isolation boost module and the second controller, which not only isolates the influence of battery voltage fluctuation on the second controller, but also further purifies the power supplied to the second controller, so that the second controller can accurately adjust the output power of the power regulation module. Regardless of the working mode, the LED lamp can obtain a stable and matching power supply, avoiding power output deviation and signal distortion caused by unstable power supply, greatly improving the anti-interference ability of the entire circuit and the lighting quality and efficiency of the LED lamp.

[0056] In an exemplary embodiment, Fig. 9 As shown, the isolation boost module 10 includes a switching power supply control circuit 102, a boost circuit 104, an isolation transformer 106, a photoelectric coupling circuit 108 and a full-wave rectifier filter circuit 110; wherein the energy storage module 4 is connected to the power regulation module 12 via the switching power supply control circuit 102, the boost circuit 104, the isolation transformer 106 and the full-wave rectifier filter circuit 110 in sequence; the photoelectric coupling circuit 108 is connected between the switching power supply control circuit 102 and the boost circuit 104.

[0057] In a specific embodiment, the second controller 14 is selected as follows: Figure 3 When the MCU (MM32F0010A1T) shown in FIG. 1 is used, the isolation boost module 10 can be as follows: Fig. 9 The circuit shown in the figure needs to be explained. Fig. 9 The circuit structures and device selections shown are for illustration only and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known to those skilled in the art from the figures and will not be repeated here.

[0058] For example, the 12.8V DC voltage output by the energy storage module 4 is Fig. 9 The isolated boost module 10 shown boosts the DC power to about 400V as the bus voltage.

[0059] In this embodiment, the optoelectronic coupling circuit is located between the switching power supply control circuit and the boost circuit. Through the conversion of the photoelectric signal, the contactless transmission of the control signal is realized, the electrical isolation between the circuits is further strengthened, the electromagnetic interference on the signal line is avoided, and the accuracy of the control signal is ensured; the full-wave rectifier and filter circuit is connected after the isolation transformer, and the AC power output by the transformer is converted into smooth DC power to provide stable and reliable power for the power regulation module. The whole process is carried out through the close cooperation of various circuit modules, which not only improves the efficiency of power conversion, but also significantly enhances the anti-interference ability of the circuit, ensuring the stable operation of the LED lamp in complex environments. At the same time, the dual isolation mechanism of the isolation transformer and the optoelectronic coupling circuit effectively protects the control circuit from the influence of interference on the power supply side, greatly improving the stability and reliability of the entire circuit.

[0060] In an exemplary embodiment, Fig.10a and Fig.10b As shown, the power regulation module 12 includes a bridge rectifier circuit 122, a filter circuit 124 and a drive circuit 126; wherein the isolation boost module 10 is connected to the LED lamp 900 via the bridge rectifier circuit 122 and the filter circuit 124 in sequence; the drive circuit 126 is connected between the second controller 14 and the bridge rectifier circuit 122.

[0061] In a specific embodiment, the second controller 14 is selected as follows: Figure 3 When the MCU (MM32F0010A1T) shown in FIG. 1 is used, the bridge rectifier circuit 122 and the filter circuit 124 may be as follows: Fig.10a The circuit shown in FIG. 1 may be a driving circuit 126. Fig.10b The circuit shown in the figure needs to be explained. Fig.10a and Fig.10b The circuit structures and device selections shown are for illustration only and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known to those skilled in the art from the figures and will not be repeated here.

[0062] For example, based on the SPWM modulation wave generated by the second controller 14, Fig.10b The driving circuit 126 shown in the figure implements SPWM driving and outputs to Fig.10a The bridge rectifier circuit 122 shown in FIG. Fig.10a The filter circuit 124 shown obtains an AC sine wave and outputs it to the LED lamp 900 .

[0063] In this embodiment, the isolated boost module first increases the power supply voltage and further purifies it through the bridge rectifier circuit and the filter circuit to eliminate ripples, thereby ensuring that the current input to the LED lamp is stable and pure; the drive circuit receives the SPWM (Sinusoidal Pulse Width Modulation) signal from the second controller and converts it into the drive signal required by the LED lamp. In this process, the application of SPWM technology enables the output current to accurately track the desired sinusoidal waveform, which not only improves the power conversion efficiency, but also significantly reduces harmonic distortion, ensuring that the light output of the LED lamp is stable and soft, and avoiding visual flickering; in addition, through the regulation of the drive circuit, the system can flexibly adapt to different brightness requirements and realize intelligent dimming, thereby meeting the lighting requirements while maximizing energy savings and extending the service life of the LED lamp.

[0064] In an exemplary embodiment, Fig.11 As shown, the pure sinusoidal wave output circuit further includes a first sampling module 20 ; wherein the first sampling module 20 is connected between the filter circuit 124 and the first controller 6 , and the first sampling module 20 is used to collect the output current of the filter circuit 124 .

[0065] Exemplarily, the first sampling module 20 transmits the collected output current of the filter circuit 124 to the first controller 6, so that the first controller 6 adjusts the output of the first controller 6 to the following based on the collected output current of the filter circuit 124: Figure 6 The PWM control signal of the output current calculation circuit 82 shown in FIG. Figure 6 The output power of the constant power output circuit 84 shown in the figure increases until a preset power is reached.

[0066] In this embodiment, continuous monitoring by the first sampling module effectively ensures that when the mains power is disconnected, the power output to the LED lamp is relatively stable under the emergency drive of the first controller.

[0067] In an exemplary embodiment, Fig.11 As shown, the first sampling module 20 includes a Hall current sensor 202 and an operational amplifier circuit 204 ; wherein the filter circuit 124 is connected to the first controller 6 via the Hall current sensor 202 and the operational amplifier circuit 204 in sequence.

[0068] In a specific embodiment, the first controller 6 is selected as follows: Figure 2 When the MCU (SM8F570212S) shown in FIG. 1 is used, the first sampling module 20 may include: Fig.11 The Hall current sensor 202 and its peripheral circuits shown in FIG. Fig.11The operational amplifier circuit 204 shown in FIG. 1 is a schematic diagram of a filter circuit 124, wherein the filter circuit 124 is connected to the first controller 6 via the Hall current sensor 202 and the operational amplifier circuit 204 in sequence. Fig.11 The circuit structures and device selections shown are for illustration only and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known to those skilled in the art from the figures and will not be repeated here.

[0069] Exemplarily, the output current of the filter circuit 124 is collected by the Hall current sensor 202 , amplified by the operational amplifier circuit 204 , and then output to the AD interface of the first controller 6 for reading.

[0070] In this embodiment, a specific and feasible implementation method is provided for the implementation of the first sampling module, wherein the Hall current sensor can be used to accurately measure the output current of the filter circuit without being directly connected in series with the main circuit, which not only significantly reduces the energy loss in the circuit, but also effectively avoids the additional voltage drop introduced by the sampling resistor, thereby ensuring the efficiency and reliability of the circuit as a whole; in addition, the non-contact measurement method of the Hall effect naturally isolates the main circuit and the control circuit, greatly reduces electromagnetic interference, and ensures the purity and stability of the current sampling signal; and the subsequent operational amplifier circuit further amplifies the weak signal output by the Hall sensor, which is convenient for the first controller to accurately read and analyze through its AD interface, thereby realizing real-time monitoring and intelligent feedback of the circuit working status.

[0071] In an exemplary embodiment, Fig.11 and Fig.12 As shown, the pure sine wave output circuit also includes a second sampling module 22 and a third sampling module 24; wherein the second sampling module 22 is connected between the second controller 14 and the filter circuit 124, and the second sampling module 22 is used to collect the output voltage of the filter circuit 124; the third sampling module 24 is connected between the second controller 14 and the rectifier circuit, and the third sampling module 24 is used to collect the output current of the rectifier circuit.

[0072] In a specific embodiment, the second controller 14 is selected as follows: Figure 3 When the MCU (MM32F0010A1T) shown in FIG. 1 is used, the second sampling module 22 may be as follows: Fig.11 The circuit corresponding to the second sampling module 22 shown in FIG. 1 and the third sampling module 24 may be as follows: Fig.12 The circuit corresponding to the third sampling module 24 shown in FIG. Fig.11 and Fig.12 The circuit structures and device selections shown are for illustration only and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known to those skilled in the art from the figures and will not be repeated here.

[0073] Exemplarily, the output voltage of the filter circuit 124 is collected by the second sampling module 22, and the output current of the rectifier circuit is collected by the third sampling module 24, and output to the second controller 14. The second controller 14 adjusts the duty cycle of the SPWM signal of the drive circuit 126 based on the output voltage of the filter circuit 124 and the output current of the rectifier circuit, so that the voltage output to the LED lamp 900 changes from small to large to achieve power regulation of the DOB linear LED drive until the preset power is reached.

[0074] In this embodiment, the second sampling module accurately captures the real-time changes in the output voltage of the filter circuit, while the third sampling module tracks the dynamics of the output current of the rectifier circuit. The real-time feedback of these two sets of key parameters provides the second controller with comprehensive circuit status information; based on these precise sampling data, the second controller can intelligently adjust the SPWM signal duty cycle of the drive circuit, thereby finely adjusting the voltage output to the LED lamp until the preset target power is reached. Secondly, compared with the existing DOB linear lamps that increase the thyristor control circuit to adjust the power to achieve dimming, this embodiment can directly adjust the power to achieve dimming based on the output voltage of the filter circuit collected by the second sampling module and the output current of the rectifier circuit collected by the third sampling module, which reduces the cost and can match most DOB linear lamps and thyristor lamps, avoiding the occurrence of flicker.

[0075] In an exemplary embodiment, Fig.13 As shown, the pure sinusoidal wave output circuit further includes an energy storage module voltage monitoring module 26 ; wherein the energy storage module voltage monitoring module 26 is connected between the energy storage module 4 and the first controller 6 .

[0076] Among them, the selection of the first controller 6 is as follows Figure 2 When the MCU (SM8F570212S) shown in FIG. 1 is used, the energy storage module voltage monitoring module 26 may be as follows: Fig.13 The circuit shown in Figure 1 is shown in Figure 1. It should be noted that if Fig.13 The circuit structures and device selections shown are for illustration only and are not specifically limited. The specific connection relationship and selection of each device in each circuit can be directly known to those skilled in the art from the figures and will not be repeated here.

[0077] Exemplarily, the voltage of the energy storage module 4 is monitored by the energy storage module voltage monitoring module 26 to implement energy storage module 4 management, such as triggering a low battery warning when the voltage of the energy storage module 4 is lower than a certain threshold, or automatically reducing the output power to extend the usage time when the power of the energy storage module 4 is close to being exhausted.

[0078] In this embodiment, the energy storage module voltage monitoring module can accurately monitor the voltage status of the energy storage module and provide real-time feedback to the first controller. When it is detected that the voltage of the energy storage module drops below a preset threshold, the first controller can promptly trigger a low-battery warning to remind the user to pay attention to the battery status and avoid sudden power outages. At the same time, when the battery is close to being exhausted, the system automatically reduces the output power and takes power-saving measures to extend the continuous use time of the lamp and avoid sudden extinction due to exhaustion of power.

[0079] In an exemplary embodiment, Fig.14 As shown, the pure sine wave output circuit further includes a burn-in recovery circuit 28 .

[0080] In an exemplary embodiment, the present application further provides a pure sine wave output device, which includes a housing and the pure sine wave output circuit in the above embodiment, wherein the pure sine wave output circuit is disposed in the housing.

[0081] In an exemplary embodiment, the present application also provides a power supply system, which includes a mains power supply device and the pure sine wave output device in the above embodiment, and the mains power supply device is used to transmit mains power to the pure sine wave output device.

[0082] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A pure sine wave output circuit, characterized in that: Applied to LED lamps, the pure sine wave output circuit includes a power supply module, an energy storage module, a first controller, an LED drive module, an isolation boost module, a power regulation module and a second controller; Among them, one end of the power supply module is used to access the mains, and the other end of the power supply module is connected to the LED lamp via the energy storage module, the isolation boost module and the power regulation module in sequence; the first controller is connected to the power supply module and the energy storage module respectively, and the first controller is also connected to the LED lamp via the LED driving module; the second controller is connected to the isolation boost module and the power regulation module respectively; The first controller is used to control the LED driving module to drive the LED lamp to work when the mains power is disconnected; the second controller is used to adjust the output power of the power adjustment module.

2. The pure sine wave output circuit according to claim 1, characterized in that: The isolated boost module includes a switching power supply control circuit, a boost circuit, an isolation transformer, a photoelectric coupling circuit and a full-wave rectification and filtering circuit; Among them, the energy storage module is connected to the power regulation module via the switching power supply control circuit, the boost circuit, the isolation transformer and the full-wave rectification and filtering circuit in sequence; the photoelectric coupling circuit is connected between the switching power supply control circuit and the boost circuit.

3. The pure sine wave output circuit according to claim 1, characterized in that: The power regulation module includes a bridge rectifier circuit, a filter circuit and a drive circuit; Wherein, the isolation boost module is connected to the LED lamp via the bridge rectifier circuit and the filter circuit in sequence; and the drive circuit is connected between the second controller and the bridge rectifier circuit.

4. The pure sine wave output circuit according to claim 3, characterized in that: The pure sine wave output circuit also includes a first sampling module; The first sampling module is connected between the filter circuit and the first controller, and is used to collect the output current of the filter circuit.

5. The pure sine wave output circuit according to claim 4, characterized in that: The first sampling module includes a Hall current sensor and an operational amplifier circuit; Wherein, the filtering circuit is connected to the first controller via the Hall current sensor and the operational amplifier circuit in sequence.

6. The pure sine wave output circuit according to claim 3, characterized in that: The pure sine wave output circuit also includes a second sampling module and a third sampling module; Among them, the second sampling module is connected between the second controller and the filtering circuit, and the second sampling module is used to collect the output voltage of the filtering circuit; the third sampling module is connected between the second controller and the rectifier circuit, and the third sampling module is used to collect the output current of the rectifier circuit.

7. The pure sine wave output circuit according to claim 1, characterized in that: The pure sine wave output circuit also includes an energy storage module voltage monitoring module; Wherein, the energy storage module voltage monitoring module is connected between the energy storage module and the first controller.

8. The pure sine wave output circuit according to claim 1, characterized in that: The pure sine wave output circuit also includes a first voltage stabilizing circuit and a second voltage stabilizing circuit; Wherein, the first voltage stabilizing circuit is connected between the power supply module and the first controller; the second voltage stabilizing circuit is connected between the isolation boost module and the second controller.

9. A pure sine wave output device, characterized in that: The pure sine wave output device comprises a housing and a pure sine wave output circuit as claimed in any one of claims 1 to 8, wherein the pure sine wave output circuit is arranged in the housing.

10. A power supply system, characterized in that: The power supply system comprises a mains power supply device and the pure sine wave output device as claimed in claim 9, wherein the mains power supply device is used to transmit mains power to the pure sine wave output device.

Images