Adaptive current ripple rejection circuit, system, and lighting product

Abstract

The application is suitable for the field of power electronics, and provides a self-adaptive current ripple suppression circuit, system and lighting product. The current ripple suppression module in the self-adaptive current ripple suppression circuit is connected in series between a dimming power supply and a load, the first end of a signal acquisition module is used for electrical connection with the dimming power supply, and the second end of the signal acquisition module is electrically connected with the current ripple suppression module. The signal acquisition module is used for acquiring a current signal output by the dimming power supply, and outputs a voltage signal to the current ripple suppression module according to the current signal. When the voltage signal is less than or equal to a preset voltage signal, the current ripple suppression module filters out the ripple of the current signal, and transmits the current signal after the ripple filtering to the load, and when the voltage signal is greater than the preset voltage signal, the current ripple suppression module transmits the current signal to the load. The application solves the problem of reduced power supply efficiency caused by the light jitter problem of the lighting product when the silicon-controlled rectifier dimmer is adjusted to the low end.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power electronics, and particularly relates to an adaptive current ripple suppression circuit, system and lighting product. BACKGROUND

[0002] Currently, the light-adjustable lighting product such as the LED (Light-Emitting Diode) lighting product is usually matched with the silicon-controlled dimmer to adjust the light output effect, but the current output by the silicon-controlled dimmer may have ripple when the silicon-controlled dimmer is adjusted to the low end (small phase angle) due to the power supply distortion, which may cause the light jitter of the lighting product and further cause the discomfort of the human eye. The current ripple suppression circuit is usually added at the output end of the silicon-controlled dimmer to filter the ripple in the current, so as to improve the light-emitting quality of the lighting product, but the power efficiency is reduced. SUMMARY

[0003] The embodiments of the present application provide an adaptive current ripple suppression circuit, system and lighting product, which can solve the problem of reduced power efficiency caused by the light jitter of the lighting product when the silicon-controlled dimmer is adjusted to the low end.

[0004] In a first aspect, the embodiments of the present application provide an adaptive current ripple suppression circuit, comprising a signal acquisition module and a current ripple suppression module, the current ripple suppression module is connected in series between a dimmer and a load, a first end of the signal acquisition module is used to be electrically connected with the dimmer, and a second end of the signal acquisition module is electrically connected with the current ripple suppression module.

[0005] The signal acquisition module is used to acquire a current signal output by the dimmer, and output a voltage signal to the current ripple suppression module according to the current signal; when the voltage signal is less than or equal to a preset voltage signal, the current ripple suppression module filters the ripple of the current signal, and transmits the current signal after the ripple filtering to the load; and when the voltage signal is greater than the preset voltage signal, the current ripple suppression module transmits the current signal to the load.

[0006] In a possible implementation manner of the first aspect, the current ripple suppression module comprises a switching unit and a current ripple suppression unit; the switching unit is electrically connected with the second end of the signal acquisition module and the current ripple suppression unit respectively, the switching unit and the current ripple suppression unit are both used to be electrically connected with the dimmer, and the current ripple suppression unit is further used to be electrically connected with the load.

[0007] The switch unit is configured to receive the voltage signal, when the voltage signal is less than or equal to the preset voltage signal, the switch unit is turned off, the current ripple suppression unit performs ripple filtering on the current signal, and transmits the ripple-filtered current signal to the load, when the voltage signal is greater than the preset voltage signal, the switch unit is turned on, and outputs a first voltage signal to the current ripple suppression unit, and the current ripple suppression unit transmits the current signal to the load according to the first voltage signal.

[0008] In a possible implementation manner of the first aspect, when the first end of the signal acquisition module is configured to be electrically connected to the negative electrode of the dimming power supply, the switch unit comprises a first resistor, a first switch tube and a second switch tube; the first resistor is electrically connected to the first conduction end of the second switch tube, the current ripple suppression unit and the positive electrode of the dimming power supply respectively, the second end of the first resistor is electrically connected to the control end of the second switch tube and the first conduction end of the first switch tube respectively, the second conduction end of the second switch tube is electrically connected to the current ripple suppression unit, the second conduction end of the first switch tube is electrically connected to the first end of the signal acquisition module and the negative electrode of the dimming power supply respectively, and the control end of the first switch tube is electrically connected to the second end of the signal acquisition module and the current ripple suppression unit respectively.

[0009] In a possible implementation manner of the first aspect, when the first end of the signal acquisition module is configured to be electrically connected to the positive electrode of the dimming power supply, the switch unit comprises a comparator and a third switch tube; the first input end of the comparator is electrically connected to the first end of the signal acquisition module and the positive electrode of the dimming power supply respectively, the second input end of the comparator is electrically connected to the second end of the signal acquisition module, the first conduction end of the third switch tube and the current ripple suppression unit respectively, the output end of the comparator is electrically connected to the control end of the third switch tube, and the second conduction end of the third switch tube is electrically connected to the current ripple suppression unit.

[0010] In a possible implementation manner of the first aspect, the current ripple suppression unit comprises a second resistor, a third resistor, a first diode, a first voltage stabilizing tube, a second voltage stabilizing tube, a fourth switch tube and a first capacitor; the cathode of the first diode is electrically connected to the first end of the third resistor and the cathode of the second voltage stabilizing tube respectively, the anode of the second voltage stabilizing tube is electrically connected to the switch unit, the first end of the first capacitor and the first end of the second resistor respectively, the second end of the second resistor is electrically connected to the control end of the fourth switch tube and the cathode of the first voltage stabilizing tube respectively, and the second conduction end of the fourth switch tube and the anode of the first voltage stabilizing tube are configured to be electrically connected to the positive electrode of the load.

[0011] When the first end of the signal acquisition module is used for electrical connection with the negative pole of the dimmable power supply, the anode of the first diode is electrically connected with the switch unit, the second end of the third resistor, the first conduction end of the fourth switch tube and the positive pole of the dimmable power supply respectively, and the second end of the first capacitor is electrically connected with the negative pole of the load, the switch unit and the second end of the signal acquisition module respectively.

[0012] When the first end of the signal acquisition module is used for electrical connection with the positive pole of the dimmable power supply, the anode of the first diode is electrically connected with the switch unit, the second end of the signal acquisition module, the second end of the third resistor and the first conduction end of the fourth switch tube respectively, and the second end of the first capacitor is electrically connected with the negative pole of the dimmable power supply and the negative pole of the load.

[0013] In a possible implementation manner of the first aspect, when the first end of the signal acquisition module is used for electrical connection with the negative pole of the dimmable power supply, the current ripple suppression module comprises a first current ripple suppression chip and a second capacitor;

[0014] The power supply pin of the first current ripple suppression chip is used for electrical connection with the positive pole of the dimmable power supply, the control pin of the first current ripple suppression chip is electrically connected with the first end of the signal acquisition module and the negative pole of the dimmable power supply respectively, the load pin of the first current ripple suppression chip is used for electrical connection with the positive pole of the load, the capacitor pin of the first current ripple suppression chip is electrically connected with the first end of the second capacitor, and the ground pin of the first current ripple suppression chip is electrically connected with the second end of the second capacitor, the negative pole of the load and the second end of the signal acquisition module respectively.

[0015] In a possible implementation manner of the first aspect, when the first end of the signal acquisition module is used for electrical connection with the positive pole of the dimmable power supply, the current ripple suppression module comprises a second current ripple suppression chip and a third capacitor; the power supply pin of the second current ripple suppression chip is electrically connected with the positive pole of the dimmable power supply and the first end of the signal acquisition module respectively, the control pin of the second current ripple suppression chip is electrically connected with the second end of the signal acquisition module, the load pin of the second current ripple suppression chip is electrically connected with the positive pole of the load, the capacitor pin of the second current ripple suppression chip is electrically connected with the first end of the third capacitor, and the second end of the third capacitor is electrically connected with the negative pole of the dimmable power supply and the negative pole of the load respectively.

[0016] In a possible implementation manner of the first aspect, the signal acquisition module comprises a sampling resistor, the first end of the sampling resistor is used for electrical connection with the dimmable power supply, and the second end of the sampling resistor is electrically connected with the current ripple suppression module.

[0017] In a second aspect, the embodiments of the present application provide a self-adaptive current ripple suppression system, comprising a dimmer power supply and the self-adaptive current ripple suppression circuit according to any one of the first aspect, the self-adaptive current ripple suppression circuit being connected in series between the dimmer power supply and a load.

[0018] In a third aspect, the embodiments of the present application provide a lighting product, comprising a load and the self-adaptive current ripple suppression system according to the second aspect, the self-adaptive current ripple suppression system being connected in series between a triac dimmer and the load.

[0019] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0020] The embodiments of the present application provide a self-adaptive current ripple suppression circuit, comprising a signal acquisition module and a current ripple suppression module. The current ripple suppression module is connected in series between a dimmer power supply and a load, a first end of the signal acquisition module is configured to be electrically connected to the dimmer power supply, and a second end of the signal acquisition module is electrically connected to the current ripple suppression module.

[0021] The signal acquisition module is configured to acquire a current signal output by the dimmer power supply and output a voltage signal to the current ripple suppression module according to the current signal. When the voltage signal is less than or equal to a preset voltage signal, the current ripple suppression module filters out ripples of the current signal and transmits the current signal after the ripple filtering to the load. When the voltage signal is greater than the preset voltage signal, the current ripple suppression module transmits the current signal to the load.

[0022] When the voltage signal is less than or equal to the preset voltage signal, the triac dimmer is adjusted to a low end, the current ripple suppression module filters out ripples of the current signal and transmits the current signal after the ripple filtering to the load, so that the current signal flowing through the load is more stable, and the light jitter problem existing when the triac dimmer is adjusted to the low end is effectively solved.

[0023] When the voltage signal is greater than the preset voltage signal, the triac dimmer is adjusted to a medium-high end, the current ripple suppression module directly transmits the current signal output by the dimmer power supply to the load, effectively solving the problem that the power supply efficiency is reduced due to the current ripple suppression module being in a current ripple suppression mode when the triac dimmer is adjusted to the medium-high end.

[0024] The current ripple suppression module determines whether to filter out ripples of the current signal according to the acquired current signal, which not only solves the light jitter problem existing when the triac dimmer is adjusted to the low end, but also solves the problem that the power supply efficiency is reduced due to the current ripple suppression module being in the current ripple suppression mode when the triac dimmer is adjusted to the medium-high end.

[0025] In conclusion, the adaptive current ripple suppression circuit provided by the embodiments of the present application solves the problem of power efficiency reduction caused by the light jitter problem of the lighting product when the triac dimmer is adjusted to the low end.

[0026] It can be understood that the beneficial effects of the second aspect to the third aspect can be referred to the related description in the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a principle block diagram of the adaptive current ripple suppression circuit provided by an embodiment of the present application;

[0029] Figure 2 is a flowchart of the working of the adaptive current ripple suppression circuit provided by an embodiment of the present application;

[0030] Figure 3 is a principle block diagram of the adaptive current ripple suppression circuit provided by another embodiment of the present application;

[0031] Figure 4 is a circuit connection diagram of the adaptive current ripple suppression circuit provided by an embodiment of the present application;

[0032] Figure 5 is a circuit connection diagram of the adaptive current ripple suppression circuit provided by another embodiment of the present application;

[0033] Figure 6 is a circuit connection diagram of the adaptive current ripple suppression circuit provided by another embodiment of the present application;

[0034] Figure 7 is a circuit connection diagram of the adaptive current ripple suppression circuit provided by another embodiment of the present application;

[0035] Figure 8 is a principle block diagram of the adaptive current ripple suppression system provided by an embodiment of the present application;

[0036] Figure 9 is a principle block diagram of the lighting product provided by an embodiment of the present application.

[0037] In the figure: 10, adaptive current ripple suppression circuit; 101, signal acquisition module; 102, current ripple suppression module; 1021, switch unit; 1022, current ripple suppression unit; 20, dimming power supply; 30, load; 40, silicon controlled dimmer; 80, adaptive current ripple suppression system; 90, lighting product. DETAILED DESCRIPTION

[0038] In the following description, for the purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments described. However, it will be apparent to those skilled in the art that the application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the application with unnecessary detail.

[0039] It should be understood that the term "comprises" when used in this specification and the appended claims, specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0040] It should also be understood that the term "and / or" when used in this specification and the appended claims, means any one or more of the associated listed items can be present, and includes multiples of any associated listed item.

[0041] As used in this specification and the appended claims, the term "if" can be interpreted as meaning "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]", depending on the context.

[0042] In addition, in the description and the appended claims of this specification, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0043] Reference to "one embodiment" or "some embodiments" or "one implementation" or "some implementations" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in one embodiment" or "in some embodiments" or "in other embodiments" or "in still other embodiments" or other similar phrases in the specification are not necessarily all referring to the same embodiment.

[0044] Currently, the dimmable lighting products generally include a triac dimming power supply and an LED load, and the light output effect thereof is usually adjusted by a triac dimmer matched with the triac dimming power supply. The triac dimmer is connected in series between an AC (Alternating Current) power supply and the lighting product, and the voltage of the AC power supply is controlled by phase-cutting to achieve the adjustment of the light output effect of the lighting product. The AC power supply is an AC stabilized power supply device or is directly powered by a municipal power grid. The triac dimming power supply is an AC-DC (Alternating Current-Direct Current) constant current power supply compatible with the triac dimmer, and is used to provide a stable current for the LED load. However, the lighting product will often be disturbed by power supply distortion, which causes the current output by the triac dimming power supply to have a ripple when the triac dimmer is adjusted to a low end (a small phase angle), thereby causing light flicker of the lighting product and further causing discomfort to the human eye. In order to solve the above problem, a current ripple suppression circuit is usually added at the output end of the triac dimming power supply to filter out the ripple in the current, thereby improving the light emitting quality of the lighting product. However, when the triac dimmer is adjusted to a medium-high end (a large phase angle), the current ripple suppression circuit is still in a current ripple suppression mode, which causes the power supply efficiency to be reduced.

[0045] It should be noted that by adjusting the chopping phase of the triac dimmer, the conduction phase angle size can be changed to achieve dimming. When the triac dimmer is adjusted to a small phase angle, that is, the triac dimmer is adjusted to a low end, the current output by the triac dimming power supply is relatively small at this time. When the triac dimmer is adjusted to a large phase angle, that is, the triac dimmer is adjusted to a medium-high end, the current output by the triac dimming power supply is relatively large at this time.

[0046] In view of the above problems, the embodiment of the present application provides a self-adaptive current ripple suppression circuit 10, as shown in Figure 1As shown in the figure, the adaptive current ripple suppression circuit 10 comprises a signal acquisition module 101 and a current ripple suppression module 102. The current ripple suppression module 102 is connected in series between the dimming power supply 20 and the load 30. The first end of the signal acquisition module 101 is used for electrical connection with the dimming power supply 20, and the second end of the signal acquisition module 101 is electrically connected with the current ripple suppression module 102.

[0047] Specifically, as shown in the figure, Figure 2 The signal acquisition module 101 is used for acquiring the current signal output by the dimming power supply 20 and outputting a voltage signal to the current ripple suppression module 102 according to the current signal. When the voltage signal is less than or equal to a preset voltage signal, the current ripple suppression module 102 performs ripple filtering on the current signal and transmits the ripple-filtered current signal to the load 30. When the voltage signal is greater than the preset voltage signal, the current ripple suppression module 102 transmits the current signal to the load 30.

[0048] As shown in the figure, Figure 4 , Figure 5 , Figure 6 and Figure 7 The signal acquisition module 101 comprises a sampling resistor RCS. The first end of the sampling resistor RCS is used for electrical connection with the dimming power supply 20, and the second end of the sampling resistor RCS is electrically connected with the current ripple suppression module 102. The sampling resistor RCS is used for acquiring the current signal output by the dimming power supply 20 and outputting a voltage signal to the current ripple suppression module 102 according to the current signal. The resistance value of the sampling resistor RCS is R. Assuming that the voltage signal is represented by Vcs, then Vcs = Iout.t·R, wherein Iout.t represents the current signal output by the dimming power supply 20 when matched with the silicon-controlled dimmer, and R represents the resistance value of the sampling resistor RCS. Assuming that the preset voltage signal is represented by Vref, then Vref = Iout.MAX·A·R, wherein Iout.MAX represents the maximum current signal output by the dimming power supply 20 when not matched with the silicon-controlled dimmer, A represents the angle coefficient corresponding to the low end when the silicon-controlled dimmer is adjusted, and the value range is 0% to 100%, which is determined by the type of the silicon-controlled dimmer, and R represents the resistance value of the sampling resistor RCS.

[0049] Therefore, when the voltage signal Vcs is less than or equal to the preset voltage signal Vref, corresponding to the silicon-controlled dimmer being adjusted to the low end, the current ripple suppression module 102 performs ripple filtering on the current signal Iout.t and transmits the ripple-filtered current signal to the load 30, so that the current signal flowing through the load 30 is more stable, effectively solving the light jitter problem existing when the silicon-controlled dimmer is adjusted to the low end.

[0050] When the voltage signal Vcs is greater than the preset voltage signal Vref, the corresponding triac dimmer is adjusted to the medium-high end, and the current ripple suppression module 102 directly transmits the current signal Iout.t output by the dimming power supply 20 to the load 30, effectively solving the problem of reduced power supply efficiency caused by the current ripple suppression module 102 being in the current ripple suppression mode when the triac dimmer is adjusted to the medium-high end.

[0051] The current ripple suppression module 102 determines whether to perform ripple filtering on the current signal Iout.t according to the collected current signal Iout.t, thereby solving the light jitter problem existing when the triac dimmer is adjusted to the low end, and also solving the problem of reduced power supply efficiency caused by the current ripple suppression module 102 being in the current ripple suppression mode when the triac dimmer is adjusted to the medium-high end.

[0052] In summary, the adaptive current ripple suppression circuit 10 provided by the embodiment of the present application solves the problem of reduced power supply efficiency caused by solving the light jitter problem existing when the triac dimmer is adjusted to the low end.

[0053] Exemplarily, the load 30 is an LED load.

[0054] Exemplarily, the dimming power supply 20 is an AC-DC constant current power supply compatible with the triac dimmer, and the AC-DC constant current power supply can be a constant current power supply of linear, non-isolated or isolated architecture.

[0055] As shown in Figure 3 The current ripple suppression module 102 includes a switching unit 1021 and a current ripple suppression unit 1022, the current ripple suppression unit 1022 is connected in series between the dimming power supply 20 and the load 30, the switching unit 1021 is electrically connected with the second end of the signal acquisition module 101 and the current ripple suppression unit 1022 respectively, and the switching unit 1021 is also used for being electrically connected with the dimming power supply 20.

[0056] Specifically, the switching unit 1021 is used for receiving the voltage signal Vcs, when the voltage signal Vcs is less than or equal to the preset voltage signal Vref, the corresponding triac dimmer is adjusted to the low end, the switching unit 1021 is disconnected, the current ripple suppression unit 1022 performs ripple filtering on the current signal Iout.t, and transmits the ripple filtered current signal to the load 30, so that the current signal flowing through the load 30 is more stable, effectively solving the light jitter problem existing when the triac dimmer is adjusted to the low end.

[0057] When the voltage signal Vcs is greater than the preset voltage signal Vref, the corresponding thyristor dimmer is adjusted to the middle-high end, the switch unit 1021 is turned on, and a first level signal is output to the current ripple suppression unit 1022, and the current ripple suppression unit 1022 directly transmits the current signal Iout.t to the load 30 according to the first level signal, effectively solving the problem of reduced power efficiency caused by the current ripple suppression unit 1022 being in the current ripple suppression mode all the time when the thyristor dimmer is adjusted to the middle-high end. It should be noted that the first level signal is a high level signal.

[0058] The switch unit 1021 is turned off or turned on according to the collected current signal Iout.t, thereby causing the current ripple suppression unit 1022 to filter the current signal Iout.t and transmit the filtered current signal to the load 30 or transmit the current signal Iout.t to the load 30, that is, the current ripple suppression module 102 can work adaptively, solving the light jitter problem existing when the thyristor dimmer is adjusted to the low end, and also solving the problem of reduced power efficiency caused by the current ripple suppression unit 1022 being in the current ripple suppression mode when the thyristor dimmer is adjusted to the middle-high end.

[0059] As shown in Figure 4 When the first end of the signal acquisition module 101 is used for electrical connection with the negative electrode of the dimming power supply 20, that is, the first end of the sampling resistor RCS is used for electrical connection with the negative electrode of the dimming power supply 20, the switch unit 1021 includes a first resistor R1, a first switch tube Q1, and a second switch tube Q2. The first resistor R1 is electrically connected with the first conduction end of the second switch tube Q2, the current ripple suppression unit 1022, and the positive electrode of the dimming power supply 20, respectively. The second end of the first resistor R1 is electrically connected with the control end of the second switch tube Q2 and the first conduction end of the first switch tube Q1, respectively. The second conduction end of the second switch tube Q2 is electrically connected with the current ripple suppression unit 1022. The second conduction end of the first switch tube Q1 is electrically connected with the first end of the signal acquisition module 101 and the negative electrode of the dimming power supply 20, respectively. The control end of the first switch tube Q1 is electrically connected with the second end of the signal acquisition module 101 and the current ripple suppression unit 1022, respectively. According to Figure 4 It can be known that the second conduction end of the first switch tube Q1 is electrically connected with the first end of the sampling resistor RCS and the negative electrode of the dimming power supply 20, respectively. The control end of the first switch tube Q1 is electrically connected with the second end of the sampling resistor RCS and the current ripple suppression unit 1022, respectively.

[0060] Specifically, when the current signal Iout.t output by the dimming power supply 20 is small, the voltage signal Vcs is also small, which is less than the preset voltage signal Vref, corresponding to the low end of the TRIAC dimmer adjustment. Since the voltage signal Vcs is small, the voltage difference between the voltage at the control end of the first switch tube Q1 and the voltage at the second conduction end of the first switch tube Q1 is small, which does not meet the conduction condition of the first switch tube Q1, so the first switch tube Q1 is off. The voltage at the control end of the second switch tube Q2 is pulled up by the first resistor R1, which does not meet the conduction condition of the second switch tube Q2, so the second switch tube Q2 is off, i.e. the switching unit 1021 is off. When the switching unit 1021 is in the off state, the current ripple suppression unit 1022 filters the current signal Iout.t and transmits the ripple-filtered current signal to the load 30, so that the current signal flowing through the load 30 is more stable, effectively solving the light jitter problem existing when the TRIAC dimmer is adjusted to the low end.

[0061] When the current signal Iout.t output by the dimming power supply 20 is large, the voltage signal Vcs is also large, which is greater than the preset voltage signal Vref, corresponding to the middle-high end of the TRIAC dimmer adjustment. Since the voltage signal Vcs is large, the voltage difference between the voltage at the control end of the first switch tube Q1 and the voltage at the second conduction end of the first switch tube Q1 is large, which meets the conduction condition of the first switch tube Q1, so the first switch tube Q1 is on. After the first switch tube Q1 is on, the voltage at the control end of the second switch tube Q2 is pulled down, which meets the conduction condition of the second switch tube Q2, so the second switch tube Q2 is on, i.e. the switching unit 1021 is on, and outputs a first level signal to the current ripple suppression unit 1022, the first level signal being a high level signal. The current ripple suppression unit 1022 directly transmits the current signal Iout.t to the load 30 according to the first level signal, effectively solving the problem of reduced power efficiency caused by the current ripple suppression unit 1022 always being in the current ripple suppression mode when the TRIAC dimmer is adjusted to the middle-high end.

[0062] For example, the first switch tube Q1 is an NMOS (N-Metal-Oxide-Semiconductor) tube, the control end of the first switch tube Q1 is the gate of the NMOS tube, the first conduction end of the first switch tube Q1 is the drain of the NMOS tube, and the second conduction end of the first switch tube Q1 is the source of the NMOS tube. The second switch tube Q2 is a PMOS (positive channel Metal Oxide Semiconductor) tube, the control end of the second switch tube Q2 is the gate of the PMOS tube, the first conduction end of the second switch tube Q2 is the drain of the PMOS tube, and the second conduction end of the second switch tube Q2 is the source of the PMOS tube.

[0063] As Figure 4 shown, the current ripple suppression unit 1022 includes a second resistor R2, a third resistor R3, a first diode D1, a first Zener ZD1, a second Zener ZD2, a fourth switch Q4 and a first capacitor C1. The cathode of the first diode D1 is electrically connected to the first end of the third resistor R3 and the cathode of the second Zener ZD2 respectively, the anode of the second Zener ZD2 is electrically connected to the switch unit 1021, the first end of the first capacitor C1 and the first end of the second resistor R2 respectively, the second end of the second resistor R2 is electrically connected to the control end of the fourth switch Q4 and the cathode of the first Zener ZD1 respectively, and the second conduction end of the fourth switch Q4 and the anode of the first Zener ZD1 are both used for electrically connecting to the positive pole of the load 30. According to Figure 4 It can be known that the anode of the second Zener ZD2 is electrically connected to the second conduction end of the second switch Q2, the first end of the first capacitor C1 and the first end of the second resistor R2 respectively.

[0064] When the first end of the signal acquisition module 101 is used for electrically connecting to the negative pole of the dimmer power supply 20, that is, the first end of the sampling resistor RCS is used for electrically connecting to the negative pole of the dimmer power supply 20, as Figure 4 shown, the anode of the first diode D1 is electrically connected to the switch unit 1021, the second end of the third resistor R3, the first conduction end of the fourth switch Q4 and the positive pole of the dimmer power supply 20 respectively, and the second end of the first capacitor C1 is electrically connected to the negative pole of the load 30, the switch unit 1021 and the second end of the signal acquisition module 101 respectively. According to Figure 4 It can be known that the anode of the first diode D1 is electrically connected to the first end of the first resistor R1, the first conduction end of the second switch Q2, the second end of the third resistor R3, the first conduction end of the fourth switch Q4 and the positive pole of the dimmer power supply 20 respectively. The second end of the first capacitor C1 is electrically connected to the negative pole of the load 30, the control end of the first switch Q1 and the second end of the sampling resistor RCS respectively.

[0065] Specifically, when the switch unit 1021 is off, the current ripple suppression unit 1022 performs ripple filtering on the current signal Iout.t and transmits the ripple filtered current signal to the load 30. The specific working principle is that the voltage output by the dimming power supply 20 makes the fourth switch tube Q4 in a saturated conduction state after passing through the first diode D1 and the second voltage stabilizing tube ZD2. By using the characteristic that the output current of the fourth switch tube Q4 in the saturation region is constant current, the ripple filtering of the current signal Iout.t is realized, and the ripple filtered current signal is transmitted to the load 30. The first capacitor C1 is used to charge or discharge according to the voltage output by the dimming power supply 20, so as to maintain the stability of the output voltage of the dimming power supply 20, and at the same time, the first capacitor C1 also filters part of the ripple, ensuring that the current ripple suppression unit 1022 can achieve better ripple filtering effect. The second resistor R2 functions as a current limiter. The third resistor R3 is used to provide a discharge circuit when the first capacitor C1 is discharging. The first voltage stabilizing tube ZD1 is used to protect the fourth switch tube Q4 so that it will not be broken down. The function of the second voltage stabilizing tube ZD2 is to adjust the degree of current ripple suppression. The higher the voltage of the voltage stabilizing tube, the deeper the ripple suppression, and the better the effect, but it will cause the fourth switch tube Q4 to generate more loss, thereby causing the power supply efficiency to be lower. Therefore, the type of the second voltage stabilizing tube ZD2 can be determined according to the actual situation.

[0066] When the switch unit 1021 is on, the current ripple suppression unit 1022 directly transmits the current signal Iout.t to the load 30 according to the first level signal. The specific working principle is that after the switch unit 1021 is turned on, the first level signal is output to the current ripple suppression unit 1022, that is, the first level signal is output to the connection between the second voltage stabilizing tube ZD2, the second resistor R2 and the first capacitor C1. The first level signal is a high level signal, which makes the fourth switch tube Q4 fully conductive, and then the current signal Iout.t output by the dimming power supply 20 is directly transmitted to the load 30, effectively solving the problem of low power supply efficiency caused by the current ripple suppression unit 1022 being in the current ripple suppression mode all the time when the silicon-controlled dimmer is adjusted to the middle and high end.

[0067] For example, the first capacitor C1 is an electrolytic capacitor, the first end of the first capacitor C1 is the positive electrode of the electrolytic capacitor, and the second end of the first capacitor C1 is the negative electrode of the electrolytic capacitor.

[0068] For example, the fourth switch tube Q4 is an NMOS tube, the control end of the fourth switch tube Q4 is the gate of the NMOS tube, the first conduction end of the fourth switch tube Q4 is the drain of the NMOS tube, and the second conduction end of the fourth switch tube Q4 is the source of the NMOS tube.

[0069] As Figure 5As shown, when the first end of the signal acquisition module 101 is used for electrical connection with the positive pole of the dimming power supply 20, that is, the first end of the sampling resistor RCS is used for electrical connection with the positive pole of the dimming power supply 20, the switch unit 1021 includes a comparator COM and a third switch tube Q3. The first input end of the comparator COM is respectively electrically connected with the first end of the signal acquisition module 101 and the positive pole of the dimming power supply 20, the second input end of the comparator COM is respectively electrically connected with the second end of the signal acquisition module 101, the first conduction end of the third switch tube Q3 and the current ripple suppression unit 1022, the output end of the comparator COM is electrically connected with the control end of the third switch tube Q3, and the second conduction end of the third switch tube Q3 is electrically connected with the current ripple suppression unit 1022. According to the Figure 5 It can be known that the first input end of the comparator COM is respectively electrically connected with the first end of the sampling resistor RCS and the positive pole of the dimming power supply 20. The second input end of the comparator COM is respectively electrically connected with the second end of the sampling resistor RCS, the first conduction end of the third switch tube Q3, the anode of the first diode D1, the second end of the third resistor R3 and the first conduction end of the fourth switch tube Q4. The second conduction end of the third switch tube Q3 is respectively electrically connected with the anode of the second zener ZD2, the first end of the first capacitor C1 and the first end of the second resistor R2.

[0070] It should be noted that, as Figure 5 As shown, when the first end of the signal acquisition module 101 is used for electrical connection with the positive pole of the dimming power supply 20, that is, the first end of the sampling resistor RCS is used for electrical connection with the positive pole of the dimming power supply 20, the second end of the first capacitor C1 in the current ripple suppression unit 1022 is respectively electrically connected with the negative pole of the dimming power supply 20 and the negative pole of the load 30.

[0071] Specifically, when the current signal Iout.t output by the dimming power supply 20 is small, the voltage signal Vcs is also small, which is less than the preset voltage signal Vref, and the silicon-controlled dimmer is adjusted to the low end. Since the voltage signal Vcs is small, the voltage difference at the two input ends of the comparator COM is small, which does not satisfy the conduction condition of the comparator COM, the comparator COM is disconnected, and the third switch tube Q3 is also disconnected, that is, the switch unit 1021 is disconnected. By using the characteristic that the output current of the fourth switch tube Q4 in the saturation region is constant current, the current signal Iout.t is filtered, and the filtered current signal is transmitted to the load 30, so that the current signal flowing through the load 30 is more stable, and the light jitter problem existing when the silicon-controlled dimmer is adjusted to the low end is effectively solved.

[0072] When the current signal Iout.t output by the dimming power supply 20 is large, the voltage signal Vcs is also large, which is greater than the preset voltage signal Vref, corresponding to the middle-high end of the thyristor dimmer adjustment. Because the voltage signal Vcs is large, the voltage difference at the two input ends of the comparator COM is large, which satisfies the conduction condition of the comparator COM, the comparator COM is turned on, the voltage at the control end of the third switch tube Q3 is pulled up, which satisfies the conduction condition of the third switch tube Q3, so the third switch tube Q3 is turned on, that is, the switching unit 1021 is turned on, and the first level signal is output to the current ripple suppression unit 1022, and the first level signal is a high level signal. The fourth switch tube Q4 is fully turned on under the action of the first level signal, and the current signal Iout.t output by the dimming power supply 20 is directly transmitted to the load 30, effectively solving the problem of low power efficiency caused by the current ripple suppression unit 1022 being in the current ripple suppression mode all the time when the thyristor dimmer is adjusted to the middle-high end.

[0073] For example, the comparator COM is a comparator with a reference.

[0074] For example, the third switch tube Q3 is an NMOS tube, the control end of the third switch tube Q3 is the gate of the NMOS tube, the first conduction end of the third switch tube Q3 is the drain of the NMOS tube, and the second conduction end of the third switch tube Q3 is the source of the NMOS tube.

[0075] As shown in Figure 6 When the first end of the signal acquisition module 101 is used for electrical connection with the negative electrode of the dimming power supply 20, that is, the first end of the sampling resistor RCS is used for electrical connection with the negative electrode of the dimming power supply 20, the current ripple suppression module 102 includes a first current ripple suppression chip U1 and a second capacitor C2.

[0076] The power supply pin VIN of the first current ripple suppression chip U1 is used for electrical connection with the positive electrode of the dimming power supply 20, the control pins R of the first current ripple suppression chip U1 are respectively electrically connected with the first end of the signal acquisition module 101 and the negative electrode of the dimming power supply 20, the load pin LED+ of the first current ripple suppression chip U1 is used for electrical connection with the positive electrode of the load 30, the capacitor pin C+ of the first current ripple suppression chip U1 is electrically connected with the first end of the second capacitor C2, and the ground pin GND of the first current ripple suppression chip U1 is respectively electrically connected with the second end of the second capacitor C2, the negative electrode of the load 30 and the second end of the signal acquisition module 101. According to Figure 6It can be known that the control pin R of the first current ripple suppression chip U1 is electrically connected with the first end of the sampling resistor RCS and the negative electrode of the dimming power supply 20 respectively. The ground pin GND of the first current ripple suppression chip U1 is electrically connected with the second end of the second capacitor C2, the negative electrode of the load 30 and the second end of the sampling resistor RCS respectively. The second capacitor C2 functions to maintain the output voltage of the dimming power supply 20 stable and filter out part of the ripple, so as to ensure that the first current ripple suppression chip U1 can achieve better ripple filtering effect. It should be noted that the sampling resistor RCS can be flexibly set to the preset voltage signal Vref according to the actual application scene.

[0077] Specifically, when the voltage signal Vcs is less than or equal to the preset voltage signal Vref, the corresponding silicon-controlled dimmer is adjusted to the low end, the first current ripple suppression chip U1 filters the current signal Iout.t and transmits the current signal after ripple filtering to the load 30, so that the current signal flowing through the load 30 is more stable, and the light jitter problem existing when the silicon-controlled dimmer is adjusted to the low end is effectively solved.

[0078] When the voltage signal Vcs is greater than the preset voltage signal Vref, the corresponding silicon-controlled dimmer is adjusted to the medium-high end, and the first current ripple suppression chip U1 directly transmits the current signal Iout.t output by the dimming power supply 20 to the load 30, effectively solving the problem that the first current ripple suppression chip U1 is always in the current ripple suppression mode when the silicon-controlled dimmer is adjusted to the medium-high end, resulting in a decrease in power supply efficiency.

[0079] For example, the first current ripple suppression chip U1 is designed by a semiconductor field effect transistor, and can be integrated with protection functions such as overvoltage protection (OVP), overcurrent protection (OCP) and over-temperature protection (OTP) according to actual needs, so that the design is more convenient and stable.

[0080] For example, the second capacitor C2 is an electrolytic capacitor, the first end of the second capacitor C2 is the positive electrode of the electrolytic capacitor, and the second end of the second capacitor C2 is the negative electrode of the electrolytic capacitor.

[0081] For example, the second capacitor C2 is an electrolytic capacitor, the first end of the second capacitor C2 is the positive electrode of the electrolytic capacitor, and the second end of the second capacitor C2 is the negative electrode of the electrolytic capacitor. Figure 7As shown, when the first end of the signal acquisition module 101 is used for electrical connection with the positive pole of the dimming power supply 20, that is, the first end of the sampling resistor RCS is used for electrical connection with the positive pole of the dimming power supply 20, the current ripple suppression module 102 comprises a second current ripple suppression chip U2 and a third capacitor C3. The power supply pin VIN of the second current ripple suppression chip U2 is respectively electrically connected with the positive pole of the dimming power supply 20 and the first end of the signal acquisition module 101, the control pin R of the second current ripple suppression chip U2 is electrically connected with the second end of the signal acquisition module 101, the load pin LED+ of the second current ripple suppression chip U2 is electrically connected with the positive pole of the load 30, the capacitor pin C+ of the second current ripple suppression chip U2 is electrically connected with the first end of the third capacitor C3, and the second end of the third capacitor C3 is respectively electrically connected with the negative pole of the dimming power supply 20 and the negative pole of the load 30. The third capacitor C3 functions to maintain the output voltage of the dimming power supply 20 stable and filter out part of the ripple, so as to ensure that the second current ripple suppression chip U2 can achieve a better ripple filtering effect. It should be noted that the sampling resistor RCS can be flexibly set to the preset voltage signal Vref according to the actual application scenario.

[0082] Specifically, when the voltage signal Vcs is less than or equal to the preset voltage signal Vref, the triac is adjusted to the low end, the second current ripple suppression chip U2 filters the current signal Iout.t, and transmits the current signal after ripple filtering to the load 30, so that the current signal flowing through the load 30 is more stable, effectively solving the light jitter problem existing when the triac is adjusted to the low end.

[0083] When the voltage signal Vcs is greater than the preset voltage signal Vref, the triac is adjusted to the medium-high end, and the second current ripple suppression chip U2 directly transmits the current signal Iout.t output by the dimming power supply 20 to the load 30, effectively solving the problem of reduced power supply efficiency caused by the second current ripple suppression chip U2 being in the current ripple suppression mode all the time when the triac is adjusted to the medium-high end.

[0084] For example, the second current ripple suppression chip U2 is designed by a semiconductor field effect transistor, and can be integrated with protection functions such as overvoltage protection, overcurrent protection and overtemperature protection according to actual needs, and the design is more convenient and stable.

[0085] For example, the third capacitor C3 is an electrolytic capacitor, the first end of the third capacitor C3 is the positive pole of the electrolytic capacitor, and the second end of the third capacitor C3 is the negative pole of the electrolytic capacitor.

[0086] For example, the third capacitor C3 is an electrolytic capacitor, the first end of the third capacitor C3 is the positive pole of the electrolytic capacitor, and the second end of the third capacitor C3 is the negative pole of the electrolytic capacitor. Figure 8As shown, this application embodiment also provides an adaptive current ripple suppression system 80, including a dimming power supply 20 and an adaptive current ripple suppression circuit 10, wherein the adaptive current ripple suppression circuit 10 is connected in series between the dimming power supply 20 and the load 30. According to Figure 1 It can be seen that the current ripple suppression module in the adaptive current ripple suppression circuit 10 is connected in series between the dimming power supply 20 and the load 30, and the first end of the signal acquisition module in the adaptive current ripple suppression circuit 10 is electrically connected to the dimming power supply 20.

[0087] Specifically, the signal acquisition module in the adaptive current ripple suppression circuit 10 is used to acquire the current signal output by the dimming power supply 20, and outputs a voltage signal to the current ripple suppression module in the adaptive current ripple suppression circuit 10 according to the current signal. When the voltage signal is less than or equal to the preset voltage signal, the corresponding SCR dimmer is adjusted to the low end. The current ripple suppression module in the adaptive current ripple suppression circuit 10 filters out the ripple of the current signal and transmits the ripple-filtered current signal to the load 30, making the current signal flowing through the load 30 more stable and effectively solving the optical jitter problem that exists when the SCR dimmer is adjusted to the low end.

[0088] When the voltage signal is greater than the preset voltage signal, the corresponding thyristor dimmer is adjusted to the middle to high end. The current ripple suppression module in the adaptive current ripple suppression circuit 10 directly transmits the current signal output by the dimming power supply 20 to the load 30, which effectively solves the problem of reduced power efficiency caused by the adaptive current ripple suppression circuit 10 being in the current ripple suppression mode when the thyristor dimmer is adjusted to the middle to high end.

[0089] Therefore, the adaptive current ripple suppression system 80 provided in this application embodiment solves the problem of reduced power efficiency caused by lighting products when dealing with light jitter issues that occur when the SCR dimmer is adjusted to the low end.

[0090] For example, load 30 is an LED load.

[0091] like Figure 9 As shown, this application embodiment also provides a lighting product 90, including a load 30 and an adaptive current ripple suppression system 80. The adaptive current ripple suppression system 80 is connected in series between the silicon controlled rectifier dimmer 40 and the load 30. According to Figure 8 It is known that the dimming power supply in the adaptive current ripple suppression system 80 is electrically connected to the silicon controlled rectifier dimmer 40, and the adaptive current ripple suppression circuit in the adaptive current ripple suppression system 80 is electrically connected to the load 30.

[0092] Specifically, the adaptive current ripple suppression circuit in the adaptive current ripple suppression system 80 collects the current signal output by the dimming power supply, generates a voltage signal according to the current signal, and adjusts the triac dimmer 40 to the low end when the voltage signal is less than or equal to a preset voltage signal. The adaptive current ripple suppression circuit in the adaptive current ripple suppression system 80 filters the current signal and transmits the filtered current signal to the load 30, so that the current signal flowing through the load 30 is more stable, effectively solving the light jitter problem when the triac dimmer 40 is adjusted to the low end.

[0093] When the voltage signal is greater than the preset voltage signal, the triac dimmer 40 is adjusted to the medium-high end, and the adaptive current ripple suppression circuit in the adaptive current ripple suppression system 80 directly transmits the current signal to the load 30, effectively solving the problem of reduced power efficiency when the adaptive current ripple suppression system 80 is always in the current ripple suppression mode when the triac dimmer 40 is adjusted to the medium-high end.

[0094] In summary, the lighting product 90 provided by the embodiments of the present application also takes into account the power efficiency when solving the light jitter problem when the triac dimmer 40 is adjusted to the low end.

[0095] For example, the load 30 is an LED load.

[0096] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0097] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An adaptive current ripple rejection circuit, characterized by, The current ripple suppression module is connected in series between the dimmer power supply and the load, the first end of the signal acquisition module is used for being electrically connected with the dimmer power supply, and the second end of the signal acquisition module is electrically connected with the current ripple suppression module. The signal acquisition module is used for acquiring a current signal output by the dimmer power supply, and outputting a voltage signal to the current ripple suppression module according to the current signal; when the voltage signal is less than or equal to a preset voltage signal, the current ripple suppression module performs ripple filtering on the current signal, and transmits the ripple-filtered current signal to the load; when the voltage signal is greater than the preset voltage signal, the current ripple suppression module transmits the current signal to the load. The current ripple suppression module comprises a switching unit and a current ripple suppression unit, When the first end of the signal acquisition module is used for being electrically connected with the positive electrode of the dimmer power supply, the switching unit comprises a comparator and a third switch tube; the first input end of the comparator is electrically connected with the first end of the signal acquisition module and the positive electrode of the dimmer power supply respectively, the second input end of the comparator is electrically connected with the second end of the signal acquisition module, the first conduction end of the third switch tube and the current ripple suppression unit respectively, the output end of the comparator is electrically connected with the control end of the third switch tube, and the second conduction end of the third switch tube is electrically connected with the current ripple suppression unit.

2. The adaptive current ripple rejection circuit of claim 1, wherein, The current ripple suppression unit is connected in series between the dimmer power supply and the load, the switching unit is electrically connected with the second end of the signal acquisition module and the current ripple suppression unit respectively, and the switching unit is also used for being electrically connected with the dimmer power supply. The switching unit is used for receiving the voltage signal; when the voltage signal is less than or equal to the preset voltage signal, the switching unit is turned off, the current ripple suppression unit performs ripple filtering on the current signal, and transmits the ripple-filtered current signal to the load; when the voltage signal is greater than the preset voltage signal, the switching unit is turned on, and a first level signal is output to the current ripple suppression unit, and the current ripple suppression unit transmits the current signal to the load according to the first level signal.

3. The adaptive current ripple rejection circuit of claim 2, wherein, When the first end of the signal acquisition module is used for being electrically connected with the negative electrode of the dimmer power supply, the switching unit comprises a first resistor, a first switch tube and a second switch tube; the first resistor is electrically connected with the first conduction end of the second switch tube, the current ripple suppression unit and the positive electrode of the dimmer power supply respectively, the second end of the first resistor is electrically connected with the control end of the second switch tube and the first conduction end of the first switch tube respectively, the second conduction end of the second switch tube is electrically connected with the current ripple suppression unit, the second conduction end of the first switch tube is electrically connected with the first end of the signal acquisition module and the negative electrode of the dimmer power supply respectively, and the control end of the first switch tube is electrically connected with the second end of the signal acquisition module and the current ripple suppression unit respectively.

4. The adaptive current ripple rejection circuit of claim 1, wherein, The current ripple suppression unit comprises a second resistor, a third resistor, a first diode, a first voltage stabilizing tube, a second voltage stabilizing tube, a fourth switch tube and a first capacitor; the cathode of the first diode is electrically connected with the first end of the third resistor and the cathode of the second voltage stabilizing tube respectively, the anode of the second voltage stabilizing tube is electrically connected with the switch unit, the first end of the first capacitor and the first end of the second resistor respectively, the second end of the second resistor is electrically connected with the control end of the fourth switch tube and the cathode of the first voltage stabilizing tube respectively, the second conduction end of the fourth switch tube and the anode of the first voltage stabilizing tube are both used for being electrically connected with the positive pole of the load; When the first end of the signal acquisition module is used for being electrically connected with the negative pole of the dimming power supply, the anode of the first diode is electrically connected with the switch unit, the second end of the third resistor, the first conduction end of the fourth switch tube and the positive pole of the dimming power supply respectively, and the second end of the first capacitor is electrically connected with the negative pole of the load, the switch unit and the second end of the signal acquisition module respectively. When the first end of the signal acquisition module is used for being electrically connected with the positive pole of the dimming power supply, the anode of the first diode is electrically connected with the switch unit, the second end of the signal acquisition module, the second end of the third resistor and the first conduction end of the fourth switch tube respectively, and the second end of the first capacitor is electrically connected with the negative pole of the dimming power supply and the negative pole of the load respectively.

5. The adaptive current ripple rejection circuit of claim 1, wherein, When the first end of the signal acquisition module is used for being electrically connected with the negative pole of the dimming power supply, the current ripple suppression module comprises a first current ripple suppression chip and a second capacitor; The power supply pin of the first current ripple suppression chip is used for being electrically connected with the positive pole of the dimming power supply, the control pin of the first current ripple suppression chip is electrically connected with the first end of the signal acquisition module and the negative pole of the dimming power supply respectively, the load pin of the first current ripple suppression chip is used for being electrically connected with the positive pole of the load, the capacitor pin of the first current ripple suppression chip is electrically connected with the first end of the second capacitor, and the ground pin of the first current ripple suppression chip is electrically connected with the second end of the second capacitor, the negative pole of the load and the second end of the signal acquisition module respectively.

6. The adaptive current ripple rejection circuit of claim 1, wherein, When the first end of the signal acquisition module is used for being electrically connected with the positive pole of the dimming power supply, the current ripple suppression module comprises a second current ripple suppression chip and a third capacitor; the power supply pin of the second current ripple suppression chip is electrically connected with the positive pole of the dimming power supply and the first end of the signal acquisition module respectively, the control pin of the second current ripple suppression chip is electrically connected with the second end of the signal acquisition module, the load pin of the second current ripple suppression chip is electrically connected with the positive pole of the load, the capacitor pin of the second current ripple suppression chip is electrically connected with the first end of the third capacitor, and the second end of the third capacitor is electrically connected with the negative pole of the dimming power supply and the negative pole of the load respectively.

7. The adaptive current ripple rejection circuit of any of claims 1-6, wherein, The signal acquisition module comprises a sampling resistor, a first end of the sampling resistor is used for electrically connecting with the dimming power supply, and a second end of the sampling resistor is electrically connected with the current ripple suppression module.

8. An adaptive current ripple rejection system, comprising: The adaptive current ripple suppression circuit comprises a dimming power supply and the adaptive current ripple suppression circuit of any one of claims 1-7, and the adaptive current ripple suppression circuit is connected in series between the dimming power supply and a load.

9. An illumination product characterized in that, The adaptive current ripple suppression system comprises a load and the adaptive current ripple suppression system of claim 8, and the adaptive current ripple suppression system is connected in series between a silicon-controlled dimmer and the load.

Images