A voltage-controlled energy supply circuit with adaptive dimming

Abstract

The present invention relates to the field of load driving technology, and discloses a voltage-controlled energy supply circuit for adaptive dimming, comprising a voltage control module, a load, a current regulation module and a signal sampling processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port, and the signal sampling processing feedback dynamic adjustment module is used to perform signal processing on a sampling signal from a negative terminal of the load according to a dimming signal from the current regulation module, so as to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and to superimpose the mixed signal together with the sampling signal from the positive terminal of the load and feed it into the feedback port, so that the voltage control module dynamically adjusts the output voltage according to the fed-in signal, so that during the entire dimming process, the difference between the output voltage of the voltage control module and the voltage at both ends of the load is always in a constant state preset by the circuit, thereby effectively improving the dimming performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of load driving, and in particular, relates to a voltage-controlled energy supply circuit with adaptive dimming. Background Art

[0002] At present, for constant current applications that require high PFC (Power Factor Correction, which refers to the relationship between effective power and total power consumption, that is, the ratio of effective power divided by total power consumption) and no flicker, most of them adopt the method of first converting AC to DC and then converting DC to DC to meet the certification requirements, especially for constant current applications with power greater than 20W. The advantage of this method is that the front-stage circuit solution and the back-stage circuit solution are relatively mature, the performance is stable, and there are many reference solutions to choose from, but its disadvantages are also very obvious, such as EMC (Electromagnetic Compatibility, Electromagnetic Compatibility, refers to the ability of a device or system to meet the requirements in its electromagnetic environment and not cause unbearable electromagnetic interference to any device in its environment) problems are difficult to deal with, the cost of solving EMC problems is high, the volume is not easy to miniaturize, and the dimming performance improvement space is limited, etc. If the project requires some additional indicators, the cost of the driver will easily increase exponentially. For example, if high PFC, THD (Total Harmonic Distortion) less than 10%, no flicker, high efficiency, dimming depth less than 1%, small size, DIP-operated current adjustment and independent isolated power supply interface are required at the same time, it will be difficult to achieve a suitable balance between performance and cost in the design of the driver circuit.

[0003] There is also an increasingly prominent contradiction, that is, the contradiction between the current market demand for integrated intelligent power supply and the stagnation of drive topology technology. The biggest driving force of the current market is the Internet of Things, which requires lamps to have remote networked intelligent control capabilities. Therefore, it is necessary to attach networked control devices or sensors to the drive power supply, which will increase the power supply requirements. For example, at some outdoor monitoring points, lamps and sensors, cameras, and communication devices are integrated structures, requiring the power supply to power lamps and other equipment at the same time. In addition, in commercial or indoor lighting scenes, each lamp is equipped with a sensor and a communication connection module, so that each lamp has both remote networked intelligent control capabilities and can become an independently operated lighting point. This demand trend will only become stronger in the future. From this perspective, let's look at the driver power supply alone. For example, in common lighting projects with WIFI (Wireless Fidelity) dimming and color adjustment functions, the driver power supply includes an AC-to-DC constant voltage part, two DC-to-DC constant current parts, and a DC-to-DC auxiliary constant voltage power supply part. Four switching power supplies are required. The lighting project has the defects of large device size and a large number of switching power supplies. If this lighting project is to add an independent isolated power supply, then an AC-to-DC power supply must be added. For a lamp of dozens of watts, all these things have to be stuffed into a shell. Needless to say, the volume is naturally large. What's more troublesome is that there are so many internal switching power supplies, so EMC and interference will become very bad. Even if it can pass the certification, it is only after a lot of cost increases. Moreover, there is no suitable technology on the market to solve this problem, which has become a common pain point in the industry. Summary of the invention

[0004] In order to solve the problem that the existing driving circuit is difficult to meet the requirements of stable and non-fluctuating output voltage of the front-stage circuit and the output current of the rear-stage circuit and high efficiency of the rear-stage circuit at low cost during the dimming process, the purpose of the present invention is to provide an adaptive dimming voltage-controlled power supply circuit, which can ensure that the output voltage of the front-stage circuit and the output current of the rear-stage circuit are stable and non-fluctuating during the entire dimming process, and the rear-stage circuit is always in a high-efficiency working state, thereby effectively improving the dimming performance and facilitating practical application and promotion.

[0005] The technical solution adopted by the present invention is: an adaptive dimming voltage-controlled energy supply circuit, comprising a voltage control module, a load, a current regulation module and a signal sampling processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port, and the load is a light-emitting lamp;

[0006] The voltage control module is used to convert the input voltage into a DC voltage and output it;

[0007] The positive terminal of the load is connected to the voltage output terminal of the voltage control module, the negative terminal of the load is connected to one end of the current regulating module, and the other end of the current regulating module is grounded;

[0008] The current regulating module is used to regulate the magnitude of the current flowing through the load according to the external dimming signal so as to make the voltage across the load match the voltage at the voltage output end;

[0009] The first signal sampling terminal of the signal sampling processing feedback dynamic adjustment module is connected to the voltage output terminal, the second signal sampling terminal of the signal sampling processing feedback dynamic adjustment module is connected to the negative terminal, the communication terminal of the signal sampling processing feedback dynamic adjustment module is connected to the current regulation module, and the signal output terminal of the signal sampling processing feedback dynamic adjustment module is connected to the output voltage adjustment feedback port;

[0010] The signal sampling processing feedback dynamic adjustment module is used to perform signal processing on the second sampling signal from the negative terminal according to the dimming signal from the current regulation module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and superimpose the mixed signal with the first sampling signal from the voltage output terminal and feed it into the output voltage adjustment feedback port, so that the voltage control module can dynamically adjust the output voltage according to the fed-in signal, so that during the entire dimming process, the difference between the output voltage of the voltage control module and the voltage at both ends is always in a constant state preset by the circuit.

[0011] Based on the above invention content, a load driving scheme for feedback-controlling the output voltage based on a dimming signal and sampling signals at both ends of a load is provided, that is, it includes a voltage control module, a load, a current regulation module and a signal sampling processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port, and the signal sampling processing feedback dynamic adjustment module is used to perform signal processing on a second sampling signal from the negative end of the load according to the dimming signal from the current regulation module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and superimpose the mixed signal with the first sampling signal from the positive end of the load and feed it into the output voltage adjustment feedback port, so that the voltage control module dynamically adjusts the output voltage according to the fed-in signal, so that during the entire dimming process, the difference between the output voltage of the voltage control module and the voltage at both ends of the load is always in a constant state preset by the circuit, thereby achieving the purpose that the output voltage of the front-stage circuit and the output current of the rear-stage circuit are both stable and without fluctuation, and the rear-stage circuit is always in a high-efficiency working state, effectively improving the dimming performance, and facilitating practical application and promotion.

[0012] In one possible design, the voltage control module adopts a switching power supply including an inductive element circuit unit and a switch control circuit unit, wherein the inductive element circuit unit includes an inductor and / or a transformer, and the controlled end of the switch control circuit unit serves as the output voltage adjustment feedback port.

[0013] In a possible design, when the inductive element circuit unit includes a transformer, the voltage-controlled energy supply circuit further includes at least one auxiliary winding module;

[0014] The auxiliary winding module includes a crystal diode, an electrolytic capacitor and an auxiliary winding, wherein the auxiliary winding and the main winding of the transformer are in the same magnetic circuit, the anode of the crystal diode is connected to one end of the auxiliary winding, the cathode of the crystal diode is connected to the positive electrode of the electrolytic capacitor, the negative electrode of the electrolytic capacitor is grounded, and the positive electrode of the electrolytic capacitor serves as the power supply output end of the auxiliary winding module;

[0015] The third signal sampling terminal of the signal sampling processing feedback dynamic adjustment module is connected to the power supply output terminal of an auxiliary winding module among the at least one auxiliary winding module;

[0016] The signal sampling processing feedback dynamic adjustment module is further used to superimpose the third sampling signal from the power supply output end of the auxiliary winding module together with the mixed signal and the first sampling signal and feed them into the output voltage adjustment feedback port, so that when the voltage control module finds that the dimming depth is lower than the preset depth threshold during the process of dynamically adjusting the output voltage according to the fed-in signal, the switch control circuit unit enters the following intermittent energy supply mode: if the voltage value of the third sampling signal is lower than the preset voltage threshold and is in a downward trend, the energy supply is increased by shortening the interval time between two adjacent energy supply pulses; if the voltage value of the third sampling signal is in an upward trend and is close to the preset voltage threshold, the energy supply is reduced by extending the interval time between two adjacent energy supply pulses, so that each of the auxiliary winding modules can continuously and stably supply energy to the outside with the cooperation of the corresponding electrolytic capacitor.

[0017] In a possible design, the switching power supply adopts an isolated flyback power supply topology, a boost power supply topology or a buck power supply topology.

[0018] In one possible design, the current regulation module includes an integrated current stabilization circuit unit and a logic judgment unit, wherein the current stabilization circuit unit is used to lead the current flowing through the load to ground, and the logic judgment unit is used to adjust the current flowing through the load according to an external dimming signal.

[0019] In a possible design, the signal sampling processing feedback dynamic adjustment module is also used to trigger the sending of an alarm signal to the logic judgment unit when the second sampling signal is found to be abnormal, so that the logic judgment unit adjusts the current flowing through the load to zero when receiving the alarm signal, thereby achieving the purpose of protecting the load by shutting off the current.

[0020] In a possible design, the signal sampling processing feedback dynamic adjustment module includes a signal sampling and trimming circuit unit, a signal processing circuit unit and a feedback circuit unit, wherein the signal input end of the signal sampling and trimming circuit unit is connected to the negative terminal as the second signal sampling end of the signal sampling and trimming circuit unit, the signal output end of the signal sampling and trimming circuit unit is connected to the signal input end of the signal processing circuit unit, the signal output end of the signal processing circuit unit is connected to the second signal input end of the feedback circuit unit, the communication end of the signal processing circuit unit is connected to the current regulation module as the communication end of the signal sampling and processing feedback dynamic adjustment module, the first signal input end of the feedback circuit unit is connected to the voltage output end as the first signal sampling end of the signal sampling and processing feedback dynamic adjustment module, and the signal output end of the feedback circuit unit is connected to the output voltage adjustment feedback port as the signal output end of the signal sampling and processing feedback dynamic adjustment module;

[0021] The signal sampling and trimming circuit unit is used to perform trimming processing on the second sampling signal from the negative terminal, and send the trimmed signal obtained by processing to the signal processing circuit unit, wherein the trimming processing includes filtering processing, voltage division and voltage limiting processing and integration processing performed in sequence;

[0022] The signal processing circuit unit is used to perform signal processing on the trimmed signal according to the dimming signal from the current regulating module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and send the mixed signal to the feedback circuit unit;

[0023] The feedback circuit unit is used to superimpose the mixed signal and the first sampling signal from the voltage output terminal and feed them into the output voltage adjustment feedback port.

[0024] In a possible design, the trimmed signal is processed according to the dimming signal from the current regulating module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, including:

[0025] According to the dimming signal from the current regulating module, some frequency components in the trimmed signal are attenuated to a degree that is nonlinearly negatively correlated with the magnitude of the load current after dimming, so as to obtain a mixed signal in which the frequency components are nonlinearly negatively correlated with the magnitude of the load current after dimming, and when the magnitude of the load current after dimming is in a dimmed-off state, all frequency components in the trimmed signal are completely attenuated so that no signal is output to the feedback circuit unit.

[0026] In a possible design, sending the mixed signal into the feedback circuit unit includes:

[0027] After performing at least one integration process on the mixed signal, the mixed signal is amplified and sent to the feedback circuit unit.

[0028] In a possible design, the signal sampling method of the signal sampling and trimming circuit unit is a direct sampling method or an indirect sampling method, wherein the direct sampling method includes a resistor voltage division and current shunt sampling method, a transistor current shunt sampling method, an operational amplifier lossless sampling method, an optocoupler isolation sampling method and / or a digital sampling method based on a microprocessor MCU chip, and the indirect sampling method refers to a sampling method that increases the voltage through voltage superposition processing technology.

[0029] The beneficial effects of the present invention are:

[0030] (1) The present invention provides a load driving scheme for feedback-controlling the output voltage based on a dimming signal and sampling signals at both ends of a load, namely, comprising a voltage control module, a load, a current regulation module and a signal sampling processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port, and the signal sampling processing feedback dynamic adjustment module is used to perform signal processing on a second sampling signal from the negative end of the load according to the dimming signal from the current regulation module, to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and to superimpose the mixed signal with the first sampling signal from the positive end of the load and feed it into the output voltage adjustment feedback port, so that the voltage control module dynamically adjusts the output voltage according to the fed-in signal, so that during the entire dimming process, the difference between the output voltage of the voltage control module and the voltage at both ends of the load is always in a constant state preset by the circuit, thereby achieving the purpose that the output voltage of the front-stage circuit and the output current of the rear-stage circuit are both stable and non-fluctuating, and the rear-stage circuit is always in a high-efficiency working state, effectively improving the dimming performance, and facilitating practical application and promotion;

[0031] (2) It can achieve precise dimming, that is, it is compatible with a wider dimming frequency range and can achieve ultra-low depth brightness, reaching the industry's highest depth of less than one thousandth, which greatly improves the dimming experience compared to commonly used solutions;

[0032] (3) It can have a wider power application range, that is, compared with the solution of using DC to DC, the output power range can be increased by 2-3 times without increasing the cost;

[0033] (4) It can have a smaller volume. That is, since the subsequent circuit adopts inductor-free technology, it has obvious advantages in volume. Compared with the same solutions on the market, the volume can be reduced by more than 20%;

[0034] (5) It can have excellent EMC characteristics. That is, because the subsequent circuit adopts inductor-free technology, when PFC and THD are met and only a single-stage power supply structure is used, the EMC performance is excellent. Whether it is internal interference or external radiation interference, it is significantly better than the solutions on the market.

[0035] (6) When the voltage-controlled power supply circuit is in deep dimming or even standby mode, each auxiliary winding can still maintain a good output capacity, so that other control logic circuits can continue to operate. This can greatly reduce costs and simplify circuit design for projects with integrated functions, and also make the power density of the drive larger, the efficiency higher, and the application more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of the voltage-controlled energy supply circuit provided by the present invention.

[0038] Figure 2 It is a structural schematic diagram of a voltage-controlled energy supply circuit using an indirect sampling method provided by the present invention.

[0039] Figure 3 It is a structural schematic diagram of a voltage-controlled energy supply circuit of a switching power supply provided by the present invention that adopts a flyback power supply topology structure.

[0040] Figure 4 It is a structural schematic diagram of a voltage-controlled energy supply circuit of a switching power supply provided by the present invention that adopts a boost power supply topology structure.

[0041] Figure 5It is a structural schematic diagram of a voltage-controlled energy supply circuit of a switching power supply provided by the present invention that adopts a step-down power supply topology structure.

[0042] Figure 6 It is a structural schematic diagram of a voltage-controlled energy supply circuit with an auxiliary winding module provided by the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that although the description of these embodiments is used to help understand the present invention, it does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0044] It should be understood that although the terms first and second, etc. may be used herein to describe various objects, these objects should not be limited by these terms. These terms are only used to distinguish one object from another object. For example, a first object can be referred to as a second object, and similarly, a second object can be referred to as a first object without departing from the scope of the exemplary embodiments of the present invention.

[0045] It should be understood that the term "and / or" that may appear in this article is merely a description of the association relationship between associated objects, indicating that there may be three relationships. For example, A and / or B can represent three situations: A exists alone, B exists alone, or A and B exist at the same time; the term " / and" that may appear in this article describes another type of association object relationship, indicating that there may be two relationships. For example, A / and B can represent two situations: A exists alone or A and B exist at the same time; in addition, the character " / " that may appear in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0046] Embodiment 1

[0047] like Figure 1As shown, the voltage-controlled energy supply circuit with adaptive dimming provided in this embodiment includes but is not limited to a voltage control module, a load, a current regulation module and a signal sampling and processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port FB, and the load is a light-emitting lamp; the voltage control module is used to convert the input voltage into a DC voltage and output it; the positive terminal of the load is connected to the voltage output terminal V0 of the voltage control module, the negative terminal V1 of the load is connected to one end of the current regulation module, and the other end of the current regulation module is grounded; the current regulation module is used to adjust the current flowing through the load according to an external dimming signal so that the voltage at both ends of the load matches the voltage of the voltage output terminal V0; the first signal sampling terminal of the signal sampling and processing feedback dynamic adjustment module is connected to the voltage output terminal V0, and the second signal sampling terminal of the signal sampling and processing feedback dynamic adjustment module is connected to the voltage output terminal V0. The sampling end is connected to the negative terminal V1, the communication end of the signal sampling processing feedback dynamic adjustment module is connected to the current regulation module, and the signal output end of the signal sampling processing feedback dynamic adjustment module is connected to the output voltage adjustment feedback port FB; the signal sampling processing feedback dynamic adjustment module is used to perform signal processing on the second sampling signal from the negative terminal V1 according to the dimming signal from the current regulation module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and superimpose the mixed signal together with the first sampling signal from the voltage output terminal V0 and feed it into the output voltage adjustment feedback port FB, so that the voltage control module dynamically adjusts the output voltage according to the fed-in signal, so that in the entire dimming process (i.e., the dimming depth is from 0% to 100%), the difference between the output voltage of the voltage control module and the voltage at both ends is always in a constant state preset by the circuit.

[0048] like Figure 1As shown, in the specific structure of the voltage-controlled energy supply circuit, the voltage control module may be, but is not limited to, a switching power supply including an inductive element circuit unit (represented by HP in the figure) and a switch control circuit unit, wherein the inductive element circuit unit includes, but is not limited to, an inductor and / or a transformer, etc., and the controlled end of the switch control circuit unit serves as the output voltage adjustment feedback port FB. The switching power supply may be, but is not limited to, various existing buck, boost, or buck-boost circuits that implement flyback / forward and have the output voltage adjustment feedback port FB, regardless of whether it is a high PFC application or a low PFC application, an isolated application or a non-isolated application, and whether the power range is high power or low power, as long as it has the output voltage adjustment feedback port FB, it can be linked with the current regulation module of the subsequent stage to realize the corresponding voltage control application. The input voltage is represented by VIN in the figure, which can be an AC voltage or a DC voltage. The switch control circuit unit may be, but is not limited to, an existing circuit structure based on a control chip, a switch tube, and a drive circuit to realize the function of dynamically adjusting the output voltage according to the feed-in signal. In addition, the voltage output terminal V0 of the voltage control module can be connected to the positive terminal of the load through a bus; and during the entire dimming process, the difference between the output voltage of the voltage control module and the voltage at both ends is always in a constant state preset by the circuit. The specific manifestation is: during the entire dimming process, the output voltage of the voltage control module is stable and has no fluctuations (that is, including stable rise, stable fall and stable maintenance), the output current of the current regulation module is stable and has no fluctuations (that is, including stable rise, stable fall and stable maintenance), and the current regulation module is in a high-efficiency working state (that is, the negative terminal V1 will always be in a low-voltage state, the internal power dissipation is low, and thus it can work with high efficiency).

[0049] The load may specifically include various types of linear loads or nonlinear loads that require constant current operation, such as LED (Light-Emitting Diode) lamps and other light-emitting lamps. The voltage across the load is the voltage difference between the voltage output terminal V0 and the negative terminal V1. The voltage across the load may range from a low voltage of a few volts to a high voltage of several hundred volts. The current flowing through the load may range from a few milliamperes to several amperes, and the operating power of the load may range from a few watts to several hundred watts. In addition, if the light-emitting lamp is replaced with a battery, a heating wire, a pure resistor, etc., other voltage-controlled energy supply circuits with adaptive current regulation may also be obtained.

[0050] The current regulating module specifically includes but is not limited to an integrated current stabilizing circuit unit and a logic judgment unit, wherein the current stabilizing circuit unit is used to lead the current flowing through the load to the ground, and the logic judgment unit is used to adjust the current flowing through the load according to the external dimming signal, thereby taking into account the various protections required for dimming and load constant current operation. Since the negative terminal V1 is a node of voltage to ground, and its voltage value is the difference between the voltage of the voltage output terminal V0 and the voltage of the load, it can directly reflect the matching of the current voltage at both ends of the load and the voltage of the voltage output terminal V0. For example, when the voltage of the voltage output terminal V0 is greater than the voltage at both ends of the load, the voltage of the negative terminal V1 is also greater, and when the voltage of the voltage output terminal V0 is equal to the voltage at both ends of the load, the voltage of the negative terminal V1 is approximately equal to 0V (at this time, the voltage at both ends of the load matches the voltage of the voltage output terminal V0, that is, load matching is achieved). In addition, the dimming signal may be, but is not limited to, an analog signal, a digital signal or a PWM signal, and the current stabilization circuit unit may be implemented using an existing adjustable constant current circuit.

[0051] The signal sampling processing feedback dynamic adjustment module specifically includes but is not limited to a signal sampling and trimming circuit unit, a signal processing circuit unit and a feedback circuit unit, wherein the signal input end of the signal sampling and trimming circuit unit is connected to the negative terminal V1 as the second signal sampling end of the signal sampling and trimming circuit unit, the signal output end of the signal sampling and trimming circuit unit is connected to the signal input end of the signal processing circuit unit, the signal output end of the signal processing circuit unit is connected to the second signal input end of the feedback circuit unit, the communication end of the signal processing circuit unit is connected to the current regulation module as the communication end of the signal sampling and processing feedback dynamic adjustment module, the first signal input end of the feedback circuit unit is connected to the voltage output end V0 as the first signal sampling end of the signal sampling and processing feedback dynamic adjustment module, and the signal output end of the feedback circuit unit is connected to the negative terminal V1 as the negative terminal V1. The signal output end of the signal sampling processing feedback dynamic adjustment module is connected to the output voltage adjustment feedback port FB; the signal sampling trimming circuit unit is used to perform trimming processing on the second sampling signal from the negative terminal V1, and send the trimmed signal obtained by processing to the signal processing circuit unit, wherein the trimming processing includes but is not limited to filtering processing, voltage division and limiting processing and integration processing performed in sequence; the signal processing circuit unit is used to perform signal processing on the trimmed signal according to the dimming signal from the current regulation module, obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and send the mixed signal to the feedback circuit unit; the feedback circuit unit is used to superimpose the mixed signal and the first sampling signal from the voltage output terminal V0 and feed them into the output voltage adjustment feedback port FB.

[0052] The signal sampling method of the signal sampling and trimming circuit unit is a direct sampling method or an indirect sampling method. The direct sampling method includes but is not limited to a resistor voltage division and current shunting sampling method, a transistor current shunting sampling method, an operational amplifier lossless sampling method, an optocoupler isolation sampling method and / or a digital sampling method based on an MCU (Microcontroller Unit) chip, etc., which can be applied to the case where the voltage of the negative terminal V1 is relatively high, so that even after the voltage division and current shunting process, there is still a relatively high voltage component to meet the subsequent trimming process. The indirect sampling method refers to a sampling method that uses a voltage superposition processing technology to increase the voltage, that is, for the scenario where the voltage of the negative terminal V1 is relatively low, considering that its voltage component after direct sampling cannot meet the trimming process of the subsequent circuit, it is necessary to superimpose a fixed voltage Vg on the voltage of the negative terminal V1. The voltage Vg can be set according to the actual application, and can be obtained by various circuits that can achieve constant voltage output, such as a voltage regulator diode, a transistor, or even an LDO (Low Dropout Regulator, linear voltage regulator circuit) regulator, combined with the voltage of the voltage output terminal V0; such as Figure 2 As shown, the final output voltage signal Vx of the voltage superposition circuit unit is equal to the sum of the voltage of the negative terminal V1 and the voltage Vg. Therefore, whether it is a direct sampling method or an indirect sampling method, the voltage signal of the negative terminal V1 can be accurately collected in the end.

[0053] Since the load works in a stable constant current state when not dimming, that is, the voltage across the load is also in a constant state. If it is described in detail as the load of an LED lamp, the LED lamp is constant current and has no flicker. Therefore, it can be inferred that: when the entire voltage-controlled energy supply circuit is stable, the voltage at the negative terminal V1 is also a relatively stable value, that is, the waveform should be the result of subtracting the voltage across the load from the ripple voltage at the voltage output terminal V0. For a single-stage high PFC project, the ripple in the ripple voltage is an industrial frequency ripple, and if it is a two-stage topology or a low PFC structure, the ripple is a DC voltage. At the same time, during the dimming process, the voltage of the negative terminal V1 will superimpose a high-frequency component on the waveform when not dimming, and this high-frequency component is consistent with the PWM pulse frequency of the dimming signal (generally several kHz to tens of kHz). At this time, the voltage of the negative terminal V1 consists of three components: the ripple waveform voltage of the voltage output terminal V0, the voltage at both ends of the load, and the high-frequency component; and as the dimming depth is different, the ripple in the ripple waveform voltage will change accordingly, and the voltage at both ends of the load will also be affected by this. In order to ensure the continuity and consistency of the ripple waveform voltage of the voltage output terminal V0 and the voltage at both ends of the load at different dimming depths, it is necessary to perform a series of trimming processes on the sampled signal waveform, first of all, filtering processing (i.e., removing interference signals and some high-frequency components); secondly, voltage division and voltage limiting processing (i.e., its voltage division is for the convenience of circuit processing, and voltage limiting is to deal with the damage to the circuit caused by the excessive voltage of the negative terminal V1, such as when the load is abnormal, the voltage of the negative terminal V1 will become very high); finally, integration processing (i.e., removing the influence of power frequency ripple).

[0054] Considering that the voltage signal of the negative terminal V1 will become extremely complex and changeable during dimming, and is directly related to the dimming signal, in order to make the voltage at both ends of the load accurately match the voltage of the voltage output terminal V0, it is necessary to perform a part of the frequency component attenuation processing on the current trimmed signal according to the dimming signal to ensure that the mixed signal given to the feedback circuit unit will not be distorted and overshot, that is, according to the dimming signal from the current regulation module, the trimmed signal is processed to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, including but not limited to: according to the dimming signal from the current regulation module, attenuation processing is performed on some frequency components in the trimmed signal whose attenuation degree is nonlinearly negatively correlated with the load current after dimming, to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and when the load current after dimming is in the off state, all frequency components in the trimmed signal are completely attenuated so that no signal is output to the feedback circuit unit. In addition, the mixed signal is sent to the feedback circuit unit, including but not limited to: after the mixed signal is integrated at least once, it is amplified (i.e., the signal obtained by the integration processing is amplified again) and sent to the feedback circuit unit, wherein the purpose of the at least one integration processing is to ensure the integrity and dynamics of the mixed signal, and it can also prevent signal distortion and overshoot, which is the key point for the stability of the entire voltage control power supply circuit. In addition, before the signal processing circuit unit performs signal processing on the trimmed signal, it can also first perform current limiting and integration processing on the trimmed signal, that is, due to the complexity of the voltage and current of the negative terminal V1 in the change amplitude and waveform, it is necessary to further thoroughly eliminate interference clutter and abnormal waveforms to prepare for the next signal processing.

[0055] In summary, the working process of the voltage-controlled energy supply circuit includes but is not limited to the following two logics:

[0056] (A) The matching logic between the voltage at the voltage output terminal V0 and the voltage at both ends of the load, that is, this logic is based on non-dimming, and its action path is to first sample the voltage signal of the negative terminal V1 and complete the corresponding trimming and other processing to obtain a positively correlated and amplified mixed signal. From the above, it can be seen that when the voltage at the negative terminal V1 increases, it means that the voltage at both ends of the load decreases. If it is not adjusted at this time, the power consumption generated by the voltage at the negative terminal V1 multiplied by the current will be dissipated by the current regulation module, causing the temperature of the current regulation module to rise or even burn out; at this time, the feedback circuit unit will The mixed signal is superimposed with the first sampling signal from the voltage output terminal V0 and fed into the output voltage adjustment feedback port FB. The voltage control module can be used to reduce the voltage of the voltage output terminal V0, so that the voltage of the negative terminal V1 will also be reduced to a preset value accordingly. Conversely, the voltage of the voltage output terminal V0 is increased to increase the voltage of the negative terminal V1, so that the current regulation module works normally and does not enter a non-constant current state. In this way, the current regulation module can be dynamically and continuously kept in the best working state at all times, and the stability and good working efficiency of the entire voltage control function circuit are also guaranteed.

[0057] (B) The logic of dynamically adjusting the voltage of the voltage output terminal V0 during the dimming process, that is, adding a dimming state on the basis of non-dimming. Although only the dimming state is added, the complexity of the entire voltage control power supply circuit has increased a lot. It can be divided into two states for explanation. The first is the dimming state, and the second is the dimming off state. The dimming off is the extreme case of dimming (that is, the dimming depth is 0%), so the influence of the dimming off state on the entire voltage control power supply circuit is also extreme. In the dimming state, since the voltage waveform of the negative terminal V1 will be superimposed with high-frequency ripples, this high-frequency ripple can be regarded as a high-frequency square wave superimposed with low-frequency ripples after sampling and trimming processing, and when the load current size / dimming brightness after dimming becomes lower and lower, the amplitude of this waveform will increase accordingly. In this way, after sampling and trimming processing, the signal will show an upward trend as the load current after dimming becomes lower, and finally the voltage of the voltage output terminal V0 will decrease as the load current after dimming becomes smaller, which has a significant adverse effect on the dimming effect. At this time, it is necessary to adjust the voltage waveform from the negative terminal V1 according to the dimming signal. The second sampling signal of the negative terminal V1 is processed to obtain a mixed signal whose frequency component (i.e., the vibration amplitude of the frequency point signal) is nonlinearly negatively correlated with the load current after dimming, so as to offset the influence of a part of the rising trend; and as the load current after dimming becomes smaller, the mixed signal will have more frequency components extracted by the low level, so that it will remain unchanged or even show a downward trend (here, this adjustment can be achieved by setting a suitable attenuation parameter), and finally the voltage of the voltage output terminal V0 will remain unchanged or show an upward trend, so that the dimming effect is fully guaranteed. In the dimming-off state, since the load current after dimming is zero at this time, the frequency component extracted in the mixed signal is also the largest. In order to ensure that the frequency component extracted by the mixed signal can be arbitrarily set, it is necessary to add a corresponding circuit to make a logical judgment, so that it can be ensured that the signal given to the feedback circuit unit in the dimming-off state is lower than the threshold, that is, at this time, the feedback circuit unit only receives the first sampling signal from the voltage output terminal V0, which makes the voltage control module output the highest voltage and the no-load voltage. In addition, if the current is increased from 0 after dimming, the logic processing process is opposite to the above description, which will not be repeated here.

[0058] Preferably, the signal sampling processing feedback dynamic adjustment module is also used to trigger sending an alarm signal to the logic judgment unit when the second sampling signal or the mixed signal is found to be abnormal, so that the logic judgment unit adjusts the current flowing through the load to zero when receiving the alarm signal, thereby protecting the load by shutting off the current. Figure 1 and 2As shown, the aforementioned abnormality detection and alarm triggering action can be executed by the signal processing module. For example, when it is found that the voltage at both ends of the load is smaller than the set range or is short-circuited, the aforementioned alarm triggering action can be used to achieve the purpose of load abnormality protection.

[0059] In summary, the voltage-controlled power supply circuit with adaptive dimming provided by this embodiment has the following technical effects:

[0060] (1) This embodiment provides a load driving scheme for feedback-controlling the output voltage based on a dimming signal and sampling signals at both ends of a load, that is, it includes a voltage control module, a load, a current regulation module and a signal sampling processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port, and the signal sampling processing feedback dynamic adjustment module is used to perform signal processing on a second sampling signal from the negative end of the load according to the dimming signal from the current regulation module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and superimpose the mixed signal with the first sampling signal from the positive end of the load and feed it into the output voltage adjustment feedback port, so that the voltage control module dynamically adjusts the output voltage according to the fed-in signal, so that during the entire dimming process, the difference between the output voltage of the voltage control module and the voltage at both ends of the load is always in a constant state preset by the circuit, thereby achieving the purpose that the output voltage of the front-stage circuit and the output current of the rear-stage circuit are both stable and non-fluctuating, and the rear-stage circuit is always in a high-efficiency working state, effectively improving the dimming performance, and facilitating practical application and promotion;

[0061] (2) It can achieve precise dimming, that is, it is compatible with a wider dimming frequency range and can achieve ultra-low depth brightness, reaching the industry's highest depth of less than one thousandth, which greatly improves the dimming experience compared to commonly used solutions;

[0062] (3) It can have a wider power application range, that is, compared with the solution of using DC to DC, the output power range can be increased by 2-3 times without increasing the cost;

[0063] (4) It can have a smaller volume. That is, since the subsequent circuit adopts inductor-free technology, it has obvious advantages in volume. Compared with the same solutions on the market, the volume can be reduced by more than 20%;

[0064] (5) It can have excellent EMC characteristics. That is, because the subsequent circuit adopts inductor-free technology, when PFC and THD are met and only a single-stage power supply structure is used, the EMC performance is excellent. Whether it is internal interference or external radiation interference, it is significantly better than the solutions on the market.

[0065] Embodiment 2

[0066] like Figure 3 As shown, based on the technical solution of the first embodiment, this embodiment further provides a voltage-controlled power supply circuit of a switch power supply adopting an isolated flyback power supply topology structure, wherein the inductive element circuit unit includes a flyback isolation transformer, and can output voltage through crystal diodes and capacitor filtering; the input voltage VIN is various DC voltages; the switch control circuit unit adopts a circuit structure based on a controller and various switch tubes K1. The aforementioned voltage-controlled power supply circuit can be applied to low-power drive, covering various types of LED drive power supplies.

[0067] The technical effects of this embodiment can be derived by referring to the technical effects of the aforementioned embodiment 1, and will not be described in detail here.

[0068] Embodiment 3

[0069] like Figure 4 As shown, based on the technical solution of the first embodiment, this embodiment further provides a voltage-controlled energy supply circuit of a switching power supply adopting a boost power supply topology structure, wherein the inductive element circuit unit includes a power inductor, and the output voltage can also be filtered by a crystal diode and a capacitor; the input voltage VIN is various DC voltages; the switch control circuit unit adopts a circuit structure based on a controller and various switch tubes K2. The aforementioned voltage-controlled energy supply circuit can be applied to high-power driving, such as various outdoor lamps.

[0070] The technical effects of this embodiment can be derived by referring to the technical effects of the aforementioned embodiment 1, and will not be described in detail here.

[0071] Embodiment 4

[0072] like Figure 5 As shown, based on the technical solution of the first embodiment, this embodiment further provides a voltage-controlled energy supply circuit of a switching power supply adopting a step-down power supply topology structure, wherein the inductive element circuit unit includes a power inductor, and the output voltage can also be filtered by a crystal diode and a capacitor; the input voltage VIN is various DC voltages; the switch control circuit unit adopts a circuit structure based on a controller and various switch tubes K3. The aforementioned voltage-controlled energy supply circuit can be applied to low-power drive.

[0073] The technical effects of this embodiment can be derived by referring to the technical effects of the aforementioned embodiment 1, and will not be described in detail here.

[0074] Embodiment 5

[0075] like Figure 6As shown, based on the technical solution of embodiment 1, this embodiment further provides a voltage-controlled energy supply circuit that can meet other requirements such as power supply, safety regulations and feedback detection, that is, when the inductive element circuit unit includes a transformer, the voltage-controlled energy supply circuit also includes at least one auxiliary winding module; the auxiliary winding module includes a crystal diode, an electrolytic capacitor and an auxiliary winding, wherein the auxiliary winding and the main winding of the transformer are in the same magnetic circuit, the anode of the crystal diode is connected to one end of the auxiliary winding, the cathode of the crystal diode is connected to the positive electrode of the electrolytic capacitor, the negative electrode of the electrolytic capacitor is grounded, and the positive electrode of the electrolytic capacitor serves as the power supply output end of the auxiliary winding module to which it belongs; the third signal sampling end of the signal sampling processing feedback dynamic adjustment module is connected to the power supply output end of a certain auxiliary winding module in the at least one auxiliary winding module; the signal sampling processing feedback dynamic adjustment module is also used to The third sampling signal from the power supply output end of the auxiliary winding module is superimposed with the mixed signal and the first sampling signal and fed into the output voltage adjustment feedback port FB, so that when the voltage control module finds that the dimming depth is lower than the preset depth threshold during the process of dynamically adjusting the output voltage according to the fed-in signal, the switch control circuit unit enters the following intermittent energy supply mode: if the voltage value of the third sampling signal is lower than the preset voltage threshold and is in a downward trend, the energy supply is increased by shortening the interval time between two adjacent energy supply pulses; if the voltage value of the third sampling signal is in an upward trend and is close to the preset voltage threshold, the energy supply is reduced by extending the interval time between two adjacent energy supply pulses, so that each of the auxiliary winding modules can continuously and stably supply energy to the outside with the cooperation of the corresponding electrolytic capacitor (that is, the energy output interval will not become larger, and the output ripple will not become larger to affect the use).

[0076] like Figure 6As shown, the at least one auxiliary winding module is represented by HA, HB, HC and HN, so as to meet other requirements such as power supply, safety regulations and feedback detection, wherein the auxiliary winding module is represented by HA, so as to be used as a feedback detection winding to feedback the load size, voltage level and power failure of the main winding, so that the signal sampling processing feedback dynamic adjustment module can combine the output voltage, load condition and dimming signal to achieve the extreme application of each auxiliary winding continuously supplying power when the main winding output is lightly loaded or unloaded. This extreme application has obvious cost and technical advantages in dimming applications. For example, when the dimming depth is less than 10% (which can be used as the preset depth threshold) or is dimmed off, the main winding output is lightly loaded or unloaded (that is, when the dimming depth is less than 10% or is dimmed off, the signal processing circuit unit will have almost no mixed signal input into the feedback circuit unit. At this time, although the output voltage of the voltage control module will be close to / at the highest voltage, the current flowing through the load is small, so the output power of the main winding will be very low), and the auxiliary winding modules HA, HB and HC also need to provide the required energy or detection signals for different circuits; under normal circumstances, the voltage and current output by the auxiliary winding module will become very small and cannot meet normal needs. This is also a pain point in the market. Their approach is to directly add an independent AC-to-DC power supply to meet the continuous power supply of the control logic circuit, which increases the cost a lot.

[0077] This embodiment considers that the energy supply output demand of the auxiliary winding module is constant and needs to be continuous, so in the corresponding electrolytic capacitor energy supply and discharge process, the positive electrode voltage of the electrolytic capacitor (that is, the voltage value of the third sampling signal) will become lower, so that after feedback through the feedback circuit unit, when it is found that the dimming depth is lower than the preset depth threshold, the switch control circuit unit can enter the intermittent energy supply mode to make the increased energy output from the auxiliary winding (that is, when the energy supply increases, due to the strict volt-turn ratio principle, although the voltage control module will have difficulty in outputting energy due to the output voltage exceeding the preset value, the auxiliary winding module will output the increased energy due to the output voltage being lower than the preset voltage threshold), and then the electrolytic capacitor can be charged to suppress the decrease of the positive electrode voltage and maintain it at the level of the preset voltage threshold. Therefore, in this embodiment, there is no need to add a power supply circuit for AC to DC conversion, which can not only meet the normal power supply, but also greatly reduce the cost and simplify the circuit design. In addition, intermittent energy supply by emitting energy supply pulses is a prior art means.

[0078] The technical effects of this embodiment, in addition to the technical effects of the aforementioned embodiment 1, also have the following technical effects: (1) the auxiliary windings of the voltage-controlled power supply circuit can still maintain good output capacity when the voltage-controlled power supply circuit is in deep dimming or even standby mode, so that other control logic circuits can continue to operate. This can greatly reduce costs and simplify circuit design for projects with integrated functions, and also make the power density of the drive larger, the efficiency higher, and the application more flexible.

[0079] Finally, it should be noted that the present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. An adaptive dimming voltage-controlled power supply circuit, characterized in that: It includes a voltage control module, a load, a current regulation module and a signal sampling processing feedback dynamic adjustment module, wherein the voltage control module has an output voltage adjustment feedback port (FB), and the load is a light-emitting lamp; The voltage control module is used to convert the input voltage into a DC voltage and output it; The positive terminal of the load is connected to the voltage output terminal (V0) of the voltage control module, the negative terminal (V1) of the load is connected to one end of the current regulation module, and the other end of the current regulation module is grounded; The current regulating module is used to regulate the magnitude of the current flowing through the load according to the external dimming signal so as to make the voltage across the load match the voltage of the voltage output terminal (V0); The first signal sampling terminal of the signal sampling processing feedback dynamic adjustment module is connected to the voltage output terminal (V0), the second signal sampling terminal of the signal sampling processing feedback dynamic adjustment module is connected to the negative terminal (V1), the communication terminal of the signal sampling processing feedback dynamic adjustment module is connected to the current regulation module, and the signal output terminal of the signal sampling processing feedback dynamic adjustment module is connected to the output voltage adjustment feedback port (FB); The signal sampling processing feedback dynamic adjustment module is used to perform signal processing on the second sampling signal from the negative terminal (V1) according to the dimming signal from the current regulation module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and superimpose the mixed signal with the first sampling signal from the voltage output terminal (V0) and feed it into the output voltage adjustment feedback port (FB), so that the voltage control module can dynamically adjust the output voltage according to the fed-in signal, so that the difference between the output voltage of the voltage control module and the voltage at both ends is always in a constant state preset by the circuit during the entire dimming process, wherein, according to the dimming signal from the current regulation module, the difference between the output voltage of the voltage control module and the voltage at both ends is always in a constant state preset by the circuit ... ) to obtain a mixed signal with a frequency component that is nonlinearly negatively correlated with the load current after dimming, specifically comprising: according to the dimming signal from the current regulation module, performing attenuation processing on part of the frequency components in the trimmed signal obtained by trimming the second sampling signal from the negative terminal (V1) so that the attenuation degree is nonlinearly negatively correlated with the load current after dimming, to obtain a mixed signal with a frequency component that is nonlinearly negatively correlated with the load current after dimming, and when the load current after dimming is in a dimming-off state, performing complete attenuation processing on all frequency components in the trimmed signal so that no signal is output to the feedback circuit unit, and the trimming processing includes filtering processing, voltage division and voltage limiting processing, and integration processing performed in sequence.

2. The voltage-controlled energy supply circuit according to claim 1, characterized in that: The voltage control module adopts a switching power supply including an inductive element circuit unit and a switch control circuit unit, wherein the inductive element circuit unit includes an inductor and / or a transformer, and the controlled end of the switch control circuit unit serves as the output voltage adjustment feedback port (FB).

3. The voltage-controlled energy supply circuit according to claim 2, characterized in that: When the inductive element circuit unit includes a transformer, the voltage-controlled energy supply circuit also includes at least one auxiliary winding module; The auxiliary winding module includes a crystal diode, an electrolytic capacitor and an auxiliary winding, wherein the auxiliary winding and the main winding of the transformer are in the same magnetic circuit, the anode of the crystal diode is connected to one end of the auxiliary winding, the cathode of the crystal diode is connected to the positive electrode of the electrolytic capacitor, the negative electrode of the electrolytic capacitor is grounded, and the positive electrode of the electrolytic capacitor serves as the power supply output end of the auxiliary winding module; The third signal sampling terminal of the signal sampling processing feedback dynamic adjustment module is connected to the power supply output terminal of an auxiliary winding module among the at least one auxiliary winding module; The signal sampling processing feedback dynamic adjustment module is further used to superimpose the third sampling signal from the power supply output end of the auxiliary winding module together with the mixed signal and the first sampling signal and feed them into the output voltage adjustment feedback port (FB), so that when the voltage control module finds that the dimming depth is lower than the preset depth threshold during the process of dynamically adjusting the output voltage according to the fed-in signal, the switch control circuit unit enters the following intermittent energy supply mode: if the voltage value of the third sampling signal is lower than the preset voltage threshold and is in a downward trend, the energy supply is increased by shortening the interval time between two adjacent energy supply pulses; if the voltage value of the third sampling signal is in an upward trend and is close to the preset voltage threshold, the energy supply is reduced by extending the interval time between two adjacent energy supply pulses, so that each of the auxiliary winding modules can continuously and stably supply energy to the outside with the cooperation of the corresponding electrolytic capacitor.

4. The voltage-controlled energy supply circuit according to claim 2, characterized in that: The switching power supply adopts an isolated flyback power supply topology structure, a boost power supply topology structure or a buck power supply topology structure.

5. The voltage-controlled energy supply circuit according to claim 1, characterized in that: The current regulation module includes an integrated current stabilization circuit unit and a logic judgment unit, wherein the current stabilization circuit unit is used to lead the current flowing through the load to the ground, and the logic judgment unit is used to adjust the current flowing through the load according to an external dimming signal.

6. The voltage-controlled energy supply circuit according to claim 5, characterized in that: The signal sampling processing feedback dynamic adjustment module is also used to trigger the sending of an alarm signal to the logic judgment unit when the second sampling signal is found to be abnormal, so that the logic judgment unit adjusts the current flowing through the load to zero when receiving the alarm signal, thereby achieving the purpose of protecting the load by shutting off the current.

7. The voltage-controlled energy supply circuit according to claim 1, characterized in that: The signal sampling processing feedback dynamic adjustment module includes a signal sampling and trimming circuit unit, a signal processing circuit unit and a feedback circuit unit, wherein the signal input end of the signal sampling and trimming circuit unit is connected to the negative terminal (V1) as the second signal sampling end of the signal sampling and trimming circuit unit, the signal output end of the signal sampling and trimming circuit unit is connected to the signal input end of the signal processing circuit unit, the signal output end of the signal processing circuit unit is connected to the second signal input end of the feedback circuit unit, the communication end of the signal processing circuit unit is connected to the current regulation module as the communication end of the signal sampling and processing feedback dynamic adjustment module, the first signal input end of the feedback circuit unit is connected to the voltage output end (V0) as the first signal sampling end of the signal sampling and processing feedback dynamic adjustment module, and the signal output end of the feedback circuit unit is connected to the output voltage adjustment feedback port (FB) as the signal output end of the signal sampling and processing feedback dynamic adjustment module; The signal sampling and trimming circuit unit is used to perform trimming processing on the second sampling signal from the negative terminal (V1), and send the trimmed signal obtained by processing to the signal processing circuit unit, wherein the trimming processing includes filtering processing, voltage division and limiting processing, and integration processing performed in sequence; The signal processing circuit unit is used to perform signal processing on the trimmed signal according to the dimming signal from the current regulating module to obtain a mixed signal whose frequency component is nonlinearly negatively correlated with the load current after dimming, and send the mixed signal to the feedback circuit unit; The feedback circuit unit is used to superimpose the mixed signal and the first sampling signal from the voltage output terminal (V0) and feed them into the output voltage adjustment feedback port (FB).

8. The voltage-controlled energy supply circuit according to claim 7, characterized in that: Sending the mixed signal to the feedback circuit unit comprises: After performing at least one integration process on the mixed signal, the mixed signal is amplified and sent to the feedback circuit unit.

9. The voltage-controlled energy supply circuit according to claim 7, characterized in that: The signal sampling method of the signal sampling and trimming circuit unit is a direct sampling method or an indirect sampling method, wherein the direct sampling method includes a resistor voltage division and current shunt sampling method, a transistor current shunt sampling method, an operational amplifier lossless sampling method, an optocoupler isolation sampling method and / or a digital sampling method based on a microprocessor MCU chip, and the indirect sampling method refers to a sampling method that increases the voltage through voltage superposition processing technology.

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