Dimming circuit and driving method thereof, dimming lamp and dimming equipment

Abstract

The invention discloses a dimming circuit and a driving method thereof, a dimming lamp and dimming equipment, and relates to the technical field of illumination control, and the circuit comprises an input module which is set to obtain a power supply modulation signal; a voltage access end of the voltage division module is electrically connected with the input module through a power supply input line, and the voltage division module is set to receive a power supply voltage corresponding to a power supply modulation signal transmitted by the input module through the power supply input line and perform voltage division processing according to the power supply voltage to obtain a dimming voltage; and the brightness control end of the dimming control module is electrically connected with the voltage output end of the voltage division module, the load end of the dimming control module is electrically connected with the lamp, and the dimming control module is set to carry out dimming control on the lamp according to the dimming voltage transmitted by the voltage division module. According to the invention, the PWM dimming function is realized on the premise of not adding extra dimming wires.

Description

Technical Field

[0001] The present application relates to the field of lighting control technology, and in particular to a dimming circuit and a driving method thereof, a dimming lamp, and a dimming device. Background Art

[0002] In the field of lighting control technology, PWM (Pulse Width Modulation) dimming is a commonly used method. This method adjusts the brightness of LEDs (Light Emitting Diodes) by varying the pulse width of their light. However, to implement PWM dimming, almost all dimming circuits require an additional dimming wire to transmit the control signal. This not only increases circuit complexity and wiring difficulty, but also increases overall circuit design costs.

[0003] Therefore, how to realize the PWM dimming function without adding additional dimming line is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The main purpose of the present application is to provide a dimming circuit and a driving method thereof, a dimming lamp and a dimming device, aiming to realize PWM dimming function without adding additional dimming line.

[0005] To achieve the above objectives, the present application provides a dimming circuit, which includes:

[0006] An input module, wherein the input module is configured to obtain a power supply modulation signal;

[0007] a voltage divider module, wherein a voltage access terminal of the voltage divider module is electrically connected to the input module via a power input line, and the voltage divider module is configured to receive a supply voltage corresponding to the power modulation signal transmitted by the input module via the power input line, and perform voltage division processing according to the supply voltage to obtain a dimming voltage;

[0008] A dimming control module, wherein the brightness control end of the dimming control module is electrically connected to the voltage output end of the voltage divider module, the load end of the dimming control module is electrically connected to the lamp, and the dimming control module is configured to perform dimming control on the lamp based on the dimming voltage transmitted by the voltage divider module.

[0009] In one embodiment, the dimming control module includes a voltage reduction unit, a resistance sampling unit, an overvoltage protection unit, and an output unit;

[0010] The first connection end of the resistance sampling unit is electrically connected to the freewheeling end of the step-down unit and the power supply end of the step-down unit, respectively; the second connection end of the resistance sampling unit is electrically connected to the chip selection end of the step-down unit and the positive output end of the output unit, respectively; the freewheeling end of the step-down unit is electrically connected to the voltage access end of the voltage divider module;

[0011] The inductor end of the step-down unit is electrically connected to the negative output end of the output unit, and the overvoltage protection unit is electrically connected to the analog dimming end of the step-down unit and the voltage output end of the voltage divider module respectively, wherein the analog dimming end of the step-down unit constitutes the brightness control end of the dimming control module.

[0012] In one embodiment, the step-down unit includes a control chip, a freewheeling diode, an inductor, and a first capacitor;

[0013] The first end of the control chip is electrically connected to the anode of the freewheeling diode and the second end of the inductor, respectively. The first end of the inductor constitutes the inductor end of the step-down unit and is electrically connected to the negative output end. The negative output end is electrically connected to the positive output end through the first capacitor.

[0014] The cathode of the freewheeling diode constitutes the freewheeling end of the step-down unit, and is electrically connected to the voltage access end of the voltage divider module and the first connection end of the resistance sampling unit, respectively. The fifth end of the control chip constitutes the power supply end of the step-down unit and is electrically connected to the first connection end of the resistance sampling unit. The fourth end of the control chip constitutes the chip select end of the step-down unit and is electrically connected to the second connection end of the resistance sampling unit. The second end of the control chip is grounded. The third end of the control chip constitutes the analog dimming end of the step-down unit and is electrically connected to the overvoltage protection unit.

[0015] In one embodiment, the resistance sampling unit includes a first resistor and a second resistor.

[0016] The first end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the first resistor is electrically connected to the second end of the second resistor;

[0017] A connection node where the first end of the first resistor is electrically connected to the first end of the second resistor constitutes a first connection end of the resistance sampling unit, and is electrically connected to the freewheeling end of the step-down unit and the power supply end of the step-down unit;

[0018] The second end of the first resistor is electrically connected to the second end of the second resistor, and the connection node constitutes the second connection end of the resistance sampling unit, which is respectively electrically connected to the chip selection end and the positive output end of the step-down unit.

[0019] In one embodiment, the overvoltage protection unit includes a first voltage regulator tube and a second capacitor;

[0020] The first end of the second capacitor is electrically connected to the analog dimming end of the step-down unit and the cathode of the first voltage-stabilizing diode, respectively. The cathode of the first voltage-stabilizing diode is electrically connected to the voltage output end of the voltage divider module. The second end of the second capacitor and the anode of the first voltage-stabilizing diode are grounded, respectively.

[0021] In one embodiment, the input module includes a third capacitor, a positive input terminal, and a negative input terminal;

[0022] The first end of the third capacitor is electrically connected to the positive input end, and the connection node where the first end of the third capacitor is electrically connected to the positive input end constitutes the voltage access end of the voltage divider module. The first end of the third capacitor and the negative input end are grounded.

[0023] In one embodiment, the voltage divider module includes a third resistor, a fourth resistor and a second voltage regulator tube;

[0024] A first end of the third resistor is electrically connected to the power input line, a second end of the third resistor is electrically connected to the cathode of the second voltage regulator tube, and an anode of the second voltage regulator tube is electrically connected to the first end of the fourth resistor;

[0025] The connection node where the anode of the second voltage-stabilizing diode is electrically connected to the first end of the fourth resistor constitutes the voltage output end of the voltage divider module, and is electrically connected to the brightness control end of the dimming control module;

[0026] A second end of the fourth resistor is grounded.

[0027] In addition, to achieve the above-mentioned purpose, the present application further provides a driving method of a dimming circuit, which is applied to any of the above-mentioned dimming circuits, and the driving method includes:

[0028] Obtain power supply modulation signal through input module;

[0029] After the voltage dividing module receives the power supply voltage corresponding to the power supply modulation signal transmitted by the input module via the power supply input line, the voltage dividing module divides the power supply voltage to obtain a dimming voltage;

[0030] After the dimming control module receives the dimming voltage transmitted by the voltage divider module, the dimming control is performed on the lamp according to the dimming voltage.

[0031] In addition, to achieve the above objectives, the present application also provides a dimming lamp, which includes the dimming circuit described in any one of the above items.

[0032] In addition, to achieve the above-mentioned purpose, the present application further provides a dimming device, which includes the above-mentioned dimming lamp; or,

[0033] The dimming device includes a processor, a memory, and a driver program stored in the memory and executable by the processor, wherein the driver program implements the steps of the above-mentioned driving method when executed by the processor.

[0034] Without adding additional dimming lines, the dimming circuit provided in the present application, which integrates an input module, a voltage divider module, and a dimming control module, realizes an efficient PWM dimming function. Specifically, the input module can promptly obtain a power supply modulation signal containing dimming information; next, the power supply modulation signal is directly transmitted to the voltage divider module through the existing power supply input line, thereby eliminating the need to add additional dimming lines, which not only significantly reduces the wiring complexity but also effectively controls the design cost of the overall circuit; next, the voltage divider module divides the power supply voltage corresponding to the received power supply modulation signal to generate a dimming voltage for dimming; then, the dimming voltage is transmitted to the brightness control end of the dimming control module through the voltage output end of the voltage divider module, so that the dimming control module uses the dimming voltage as a basis for brightness control to directly adjust the brightness of the lamp connected to its load end, thereby realizing efficient and economical PWM dimming control. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 This is a structural block diagram of the first embodiment of the dimming circuit of the present application;

[0038] Figure 2 Schematic diagram of a dimming circuit according to an embodiment of the present application;

[0039] Figure 3 1 is a flow chart of a second embodiment of a driving method for a dimming circuit of the present application;

[0040] Figure 4 It is a structural diagram of a dimming lamp involved in an embodiment of the present application;

[0041] Figure 5This is a structural diagram of the dimming device involved in the embodiment of the present application.

[0042] Explanation of reference numerals: 100, dimming circuit; 10, input module; 20, voltage divider module; 30, dimming control module; 40, power input line; 200, lamp; 31, step-down unit; 32, resistor sampling unit; 33, overvoltage protection unit; 34, output unit; U1, control chip; D1, freewheeling diode;

[0043] L1, inductor; C1, first capacitor; R1, first resistor; R2, second resistor; R3, third resistor;

[0044] R4, the fourth resistor; Z1, the first voltage-stabilizing diode; Z2, the second voltage-stabilizing diode; C2, the second capacitor; C3, the third capacitor; P101, the positive input terminal; P102, the negative input terminal; P103, the positive output terminal; P104, the negative output terminal.

[0045] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0049] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different drawings represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with this application.

[0050] In the field of lighting control technology, PWM (Pulse Width Modulation) dimming is a commonly used method. This method adjusts the brightness of LEDs (Light Emitting Diodes) by varying the pulse width of their light. However, to implement PWM dimming, almost all dimming circuits require an additional dimming wire to transmit the control signal. This not only increases circuit complexity and wiring difficulty, but also increases overall circuit design costs.

[0051] In view of this situation, the present application provides a dimming circuit and its driving method, a dimming lamp and a dimming device, aiming to achieve efficient and economical PWM dimming function without adding additional dimming line, thereby simplifying the circuit structure and reducing costs.

[0052] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art.

[0053] In order to solve the technical defects existing in the above content, the present application provides a dimming circuit and its driving method, a dimming lamp and a dimming device.

[0054] The embodiment of the present application provides a dimming circuit 100, referring to Figure 1 As shown, Figure 1 1 is a block diagram of the structure of the first embodiment of the dimming circuit 100 of the present application. The dimming circuit 100 includes:

[0055] The input module 10 is configured to obtain a power supply modulation signal.

[0056] In this embodiment, the input module 10 provided in this application is electrically connected to the external input device. Through the input module 10, the power supply modulation signal output by the external input device can be obtained in a timely manner to provide a stable and reliable signal source for subsequent voltage division processing and dimming control.

[0057] It should be noted that the power supply modulation signal can be understood as an input power supply PWM (Pulse Width Modulation) signal, which includes the power supply voltage corresponding to the dimming information. The external input device can be a digital IC (Integrated Circuit) or a PWM chip.

[0058] The voltage divider module 20 has a voltage access end electrically connected to the input module 10 via a power input line 40. The voltage divider module 20 is configured to receive the power supply voltage corresponding to the power supply modulation signal transmitted by the input module 10 via the power input line 40, and perform voltage division processing based on the power supply voltage to obtain a dimming voltage.

[0059] In this embodiment, based on the electrical connection between the input module 10 and the voltage access end of the voltage divider module 20 through the power supply input line 40, the power supply modulation signal collected by the input module 10 is directly transmitted to the voltage access end of the voltage divider module 20 via the existing power supply input line 40, thereby realizing the unification of the power supply input line 40 and the dimming line, that is, there is no need to add additional dimming lines, thereby significantly reducing the wiring complexity and effectively controlling the design cost of the overall circuit; next, after the voltage divider module 20 set in the present application accesses the power supply voltage corresponding to the power supply modulation signal through its voltage access end, the power supply voltage is divided by the voltage divider module 20, and the dimming voltage used for dimming can be accurately obtained, thereby providing accurate and reliable dimming voltage for subsequent dimming control.

[0060] The dimming control module 30 has a brightness control end electrically connected to the voltage output end of the voltage divider module 20, and a load end electrically connected to the lamp 200. The dimming control module 30 is configured to perform dimming control on the lamp 200 based on the dimming voltage transmitted by the voltage divider module 20.

[0061] In this embodiment, based on the electrical connection between the voltage output end of the voltage divider module 20 and the brightness control end of the dimming control module 30, the dimming voltage is directly transmitted to the brightness control end of the dimming control module 30 via the voltage output end of the voltage divider module 20, and the dimming control module 30 uses the dimming voltage as the basis for brightness control to directly adjust the brightness of the lamp 200 connected to its load end, thereby realizing efficient and economical PWM dimming control.

[0062] In summary, without adding an additional dimming line, the dimming circuit 100 provided in the present application, which integrates an input module 10, a voltage divider module 20, and a dimming control module 30, realizes an efficient PWM dimming function. Specifically, the input module 10 can promptly obtain a power supply modulation signal containing dimming information; next, the power supply modulation signal is directly transmitted to the voltage divider module 20 via the existing power supply input line 40, thereby eliminating the need to add an additional dimming line, which not only significantly reduces the wiring complexity but also effectively controls the design cost of the overall circuit; next, the voltage divider module 20 divides the power supply voltage corresponding to the received power supply modulation signal to generate a dimming voltage for dimming; then, the dimming voltage is transmitted to the brightness control terminal of the dimming control module 30 via the voltage output terminal of the voltage divider module 20, thereby enabling the dimming control module 30 to use the dimming voltage as a basis for brightness control and directly adjust the brightness of the lamp 200 connected to its load terminal, thereby realizing efficient and economical PWM dimming control.

[0063] Further, in some feasible embodiments, referring to Figure 2 , Figure 2 Schematic diagram of a dimming circuit 100 according to an embodiment of the present application. The dimming control module 30 includes a step-down unit 31, a resistor sampling unit 32, an overvoltage protection unit 33, and an output unit 34. The first connection end of the resistor sampling unit 32 is electrically connected to the freewheeling end of the step-down unit 31 and the power supply end of the step-down unit 31, respectively. The second connection end of the resistor sampling unit 32 is electrically connected to the chip select end of the step-down unit 31 and the positive output end P103 of the output unit 34, respectively. The freewheeling end of the step-down unit 31 is electrically connected to the voltage access end of the voltage divider module 20. The inductor L1 end of the step-down unit 31 is electrically connected to the negative output end P104 of the output unit 34, and the overvoltage protection unit 33 is electrically connected to the analog dimming end of the step-down unit 31 and the voltage output end of the voltage divider module 20, respectively. The analog dimming end of the step-down unit 31 constitutes the brightness control end of the dimming control module 30.

[0064] In this embodiment, based on the electrical connection between the voltage output end of the voltage divider module 20 and the brightness control end of the dimming control module 30, the dimming voltage is directly transmitted to the brightness control end of the dimming control module 30 via the voltage output end of the voltage divider module 20. The dimming control module 30 then determines whether the dimming voltage is greater than or equal to the dimming threshold voltage. If the dimming voltage is greater than or equal to the dimming threshold voltage, a high-level signal is output to trigger the step-down unit 31 to switch from the off state to the on state, thereby powering the lamp 200 electrically connected to the output unit 34 through the power supply circuit corresponding to the step-down unit 31 in the on state; if the dimming voltage is less than the dimming threshold voltage, a low-level signal is output to trigger the step-down unit 31 to switch from the on state to the off state, thereby powering the lamp 200 electrically connected to the output unit 34 through the power supply circuit corresponding to the step-down unit 31 in the off state.

[0065] It should be noted that the time that the buck unit 31 is in the on state is determined by the duty cycle of the power supply modulation signal (i.e., the input power supply PWM signal); illustratively, each pulse in the input power supply PWM signal is composed of a high level and a low level, and the ratio of the pulse width (i.e., the duration of the high level) to the entire cycle is the duty cycle, and the duty cycle ratio can be customized according to user needs. This application does not impose any restrictions here, and the higher the duty cycle ratio (i.e., the longer the buck unit 31 is in the on state), the higher the brightness of the lamp 200.

[0066] In addition, it should be noted that the overvoltage protection unit 33 is arranged between the analog dimming end of the step-down unit 31 and the voltage output end of the voltage divider module 20, and the overvoltage protection unit 33 is electrically connected to the analog dimming end of the step-down unit 31 and the voltage output end of the voltage divider module 20 respectively to prevent the dimming voltage output through the voltage output end of the voltage divider module 20 from being too high and damaging the analog dimming end of the step-down unit 31, thereby ensuring that the analog dimming end of the step-down unit 31 is not damaged.

[0067] The first connection end of the resistance sampling unit 32 is electrically connected to the freewheeling end of the step-down unit 31 and the power supply end of the step-down unit 31, and the second connection end of the resistance sampling unit 32 is electrically connected to the chip selection end of the step-down unit 31 and the positive output end P103 of the output unit 34, respectively. The power supply voltage output from the voltage access end of the voltage divider module 20 connected to the freewheeling end of the step-down unit 31 (i.e., Figure 2 Vin shown) to ensure that the control chip U1 in the buck unit 31 is not damaged. For example, when the voltage drop across the two ends of the resistor sampling unit 32 (equivalent to the power supply voltage) is abnormal, a preset protection mechanism is triggered (for example, power off) to ensure that the control chip U1 in the buck unit 31 is not damaged.

[0068] Furthermore, in some other feasible embodiments, the step-down unit 31 includes a control chip U1, a freewheeling diode D1, an inductor L1 and a first capacitor C1; the first end of the control chip U1 is electrically connected to the anode of the freewheeling diode D1 and the second end of the inductor L1 respectively, the first end of the inductor L1 constitutes the inductor L1 end of the step-down unit 31 and is electrically connected to the negative output terminal P104, and the negative output terminal P104 is electrically connected to the positive output terminal P103 through the first capacitor C1; the cathode of the freewheeling diode D1 constitutes the step-down unit 3 1, and are electrically connected to the voltage access terminal of the voltage divider module 20 and the first connection terminal of the resistance sampling unit 32, respectively. The fifth terminal of the control chip U1 constitutes the power supply terminal of the step-down unit 31 and is electrically connected to the first connection terminal of the resistance sampling unit 32. The fourth terminal of the control chip U1 constitutes the chip selection terminal of the step-down unit 31 and is electrically connected to the second connection terminal of the resistance sampling unit 32. The second terminal of the control chip U1 is grounded. The third terminal of the control chip U1 constitutes the analog dimming terminal of the step-down unit 31 and is electrically connected to the overvoltage protection unit 33.

[0069] In this embodiment, after determining that the third terminal of the control chip U1 is connected to the dimming voltage input by the voltage divider module 20, the control chip U1 determines whether the dimming voltage is greater than or equal to the dimming threshold voltage. If the dimming voltage is greater than or equal to the dimming threshold voltage, the control chip U1 outputs a high-level signal to trigger the switch tube (i.e., the first terminal of the control chip U1) Figure 2 SW) is switched from the cut-off state to the on state, and when the switch tube indicated by the first end of the control chip U1 is turned on, the freewheeling diode D1 is in the cut-off state. At this time, the power supply current connected by the positive input terminal P101 supplies power to the lamp 200 electrically connected to the first capacitor C1 via the inductor L1; at this time, the inductor current in the inductor L1 will generate self-inductance while linearly increasing, and the self-inductance will hinder the rise of the inductor current (that is, a self-inductance potential with a positive upper end and a negative lower end is generated at both ends of the inductor L1 to hinder the rise of the inductor current), thereby causing the inductor L1 to convert electrical energy into magnetic energy and store it; after the high-level duration corresponding to the duty cycle of the power supply modulation signal, since the dimming voltage connected to the third end of the control chip U1 is less than the dimming threshold voltage, the switch tube indicated by the first end of the control chip U1 (that is, Figure 2The SW shown in FIG. 1 switches from the on state to the off state, and an induced electromotive force (with a negative upper end and a positive lower end) is generated across the inductor L1, hindering the current from decreasing, thereby causing the freewheeling diode D1 to be forward-biased and conducting. The inductor current in the inductor L1 then forms a loop through the freewheeling diode D1, causing the current value of the inductor current to gradually decrease. At the same time, the magnetic energy stored in the inductor L1 is converted into electrical energy and released to power the lamp 200 electrically connected to the first capacitor C1. After the low-level duration corresponding to the duty cycle of the power modulation signal, when the dimming voltage connected to the third terminal of the control chip U1 is greater than or equal to the dimming threshold voltage, the process returns to executing the above-mentioned step of outputting a high-level signal to trigger the switch tube represented by the first terminal of the control chip U1 to switch from the off state to the on state, and subsequent steps, until the PWM dimming corresponding to the entire cycle of the power modulation signal is completed.

[0070] It should be noted that the first capacitor C1 provided in this application is used to reduce the ripple of the output voltage, that is, Figure 2 The voltage drop between the positive output terminal P103 and the negative output terminal P104 shown can be understood as the power supply voltage for powering the lamp 200 .

[0071] In a specific embodiment, referring to Figure 2 Assuming the supply voltage is 24V and the voltage of the second voltage regulator Z2 is 18V, the voltage of the supply voltage Vin after passing through the third resistor R3, the second voltage regulator Z2 and the fourth resistor R4 reaches the DIM pin of the control chip U1, which is 5V or above. Then the high-level signal is output to trigger the switch tube (i.e. Figure 2 Assuming that the power supply voltage Vin is lower than 18V, the second voltage regulator Z2 is turned off, and the voltage of the DIM pin of the control chip U1 is about 0V, the control chip U1 outputs a low-level signal to trigger the switch tube (i.e. Figure 2 SW) is switched from the on state to the off state.

[0072] Further, in some feasible embodiments, referring to Figure 2The resistance sampling unit 32 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the first end of the second resistor R2, and the second end of the first resistor R1 is electrically connected to the second end of the second resistor R2. A connection node where the first end of the first resistor R1 is electrically connected to the first end of the second resistor R2 constitutes a first connection end of the resistance sampling unit 32, which is respectively electrically connected to the freewheeling end of the step-down unit 31 and the power supply end of the step-down unit 31. A connection node where the second end of the first resistor R1 is electrically connected to the second end of the second resistor R2 constitutes a second connection end of the resistance sampling unit 32, which is respectively electrically connected to the chip select end of the step-down unit 31 and the positive output end P103.

[0073] In this embodiment, Figure 2 The resistance sampling unit 32 composed of the first resistor R1 and the second resistor R2 connected in parallel realizes real-time monitoring of the supply voltage output from the voltage access terminal of the voltage divider module 20 connected to the freewheeling terminal of the voltage step-down unit 31 (ie Figure 2 Vin shown) to ensure that the control chip U1 in the buck unit 31 is not damaged. For example, when the voltage drop across the two ends of the resistor sampling unit 32 (equivalent to the power supply voltage) is abnormal, a preset protection mechanism is triggered (for example, power off) to ensure that the control chip U1 in the buck unit 31 is not damaged.

[0074] Furthermore, in some other feasible embodiments, referring to Figure 2 The overvoltage protection unit 33 includes a first voltage-stabilizing diode Z1 and a second capacitor C2; the first end of the second capacitor C2 is electrically connected to the analog dimming end of the step-down unit 31 and the cathode of the first voltage-stabilizing diode Z1, respectively; the cathode of the first voltage-stabilizing diode Z1 is electrically connected to the voltage output end of the voltage divider module 20, and the second end of the second capacitor C2 and the anode of the first voltage-stabilizing diode Z1 are grounded, respectively.

[0075] In this embodiment, the overvoltage protection unit 33 is composed of Figure 2 The circuit shown consists of a first voltage-stabilizing diode Z1 and a second capacitor C2. When the dimming voltage output by the voltage divider module 20 rises abnormally, the first voltage-stabilizing diode Z1 quickly turns on, clamping the excessive voltage near its regulated value, thereby protecting the third terminal (i.e., the DIM pin) of the control chip U1 from damage. Simultaneously, the second capacitor C2 acts as a filter element, smoothing voltage fluctuations and reducing the impact of transient overvoltages on the circuit. This not only improves the reliability and safety of the dimming circuit 100, but also effectively extends the service life of the dimming control chip U1.

[0076] Further, in some feasible embodiments, referring to Figure 2The input module 10 includes a third capacitor C3, a positive input terminal P101 and a negative input terminal P102; the first end of the third capacitor C3 is electrically connected to the positive input terminal P101, and the connection node where the first end of the third capacitor C3 is electrically connected to the positive input terminal P101 constitutes the voltage access terminal of the voltage divider module 20, and the first end of the third capacitor C3 and the negative input terminal P102 are grounded.

[0077] In this embodiment, the third capacitor C3 acts as a filter capacitor, effectively filtering out high-frequency noise and ripple in the supply voltage and providing a stable DC voltage to the voltage divider module 20. Furthermore, the first end of the third capacitor C3 and the negative input terminal P102 are grounded, ensuring a common ground connection for the dimming circuit 100 and enhancing the anti-interference capability and stability of the dimming circuit 100.

[0078] Furthermore, in some other feasible embodiments, referring to Figure 2 The voltage divider module 20 includes a third resistor R3, a fourth resistor R4, and a second voltage-stabilizing diode Z2; a first end of the third resistor R3 is electrically connected to the power input line 40, a second end of the third resistor R3 is electrically connected to the cathode of the second voltage-stabilizing diode Z2, and an anode of the second voltage-stabilizing diode Z2 is electrically connected to the first end of the fourth resistor R4; a connection node where the anode of the second voltage-stabilizing diode Z2 is electrically connected to the first end of the fourth resistor R4 constitutes a voltage output end of the voltage divider module 20, and is electrically connected to the brightness control end of the dimming control module 30; a second end of the fourth resistor R4 is grounded.

[0079] In this embodiment, by properly setting the resistance values ​​of the third resistor R3 and the fourth resistor R4, the supply voltage received by the power input line 40 can be accurately divided down to a low voltage range suitable for operation of the dimming control module 30. The second voltage regulator diode Z2 acts as a voltage stabilizing element to further stabilize the output voltage and prevent damage to the brightness control terminal of the dimming control module 30 due to voltage fluctuations.

[0080] Furthermore, based on the first embodiment of the dimming circuit of the present application, a second embodiment of the driving method of the present application is proposed, referring to Figure 3 , Figure 3 2 is a flow chart of a second embodiment of a driving method for a dimming circuit of the present application.

[0081] The driving method of the present application is applied to any of the above-mentioned dimming circuits. The driving method of the present application is executed by a terminal device that drives and controls the dimming circuit. The driving method of the present application includes the following implementation steps S10 to S30.

[0082] Step S10: Obtaining a power supply modulation signal through an input module.

[0083] In this embodiment, the input module provided in this application is electrically connected to the external input device, through which the power supply modulation signal output by the external input device can be obtained in a timely manner to provide a stable and reliable signal source for subsequent voltage division processing and dimming control.

[0084] Step S20: After the voltage dividing module receives the power supply voltage corresponding to the power supply modulation signal transmitted by the input module via the power supply input line, the voltage dividing module performs voltage division processing on the power supply voltage to obtain a dimming voltage.

[0085] In this embodiment, based on the electrical connection between the input module and the voltage access end of the voltage divider module through the power supply input line, the power supply modulation signal collected by the input module is directly transmitted to the voltage access end of the voltage divider module via the existing power supply input line, thereby realizing the unification of the power supply input line and the dimming line, that is, there is no need to add additional dimming lines, which significantly reduces the wiring complexity and effectively controls the design cost of the overall circuit; next, the voltage divider module set in the present application accesses the power supply voltage corresponding to the power supply modulation signal through its voltage access end, and then divides the power supply voltage through the voltage divider module, so that the dimming voltage used for dimming can be accurately obtained, thereby providing accurate and reliable dimming voltage for subsequent dimming control.

[0086] Step S30: After the dimming control module receives the dimming voltage transmitted by the voltage divider module, the dimming control module performs dimming control on the lamp according to the dimming voltage.

[0087] In this embodiment, based on the electrical connection between the voltage output end of the voltage divider module and the brightness control end of the dimming control module, the dimming voltage is directly transmitted to the brightness control end of the dimming control module via the voltage output end of the voltage divider module, and the dimming control module uses the dimming voltage as the basis for brightness control to directly adjust the brightness of the lamp connected to its load end, thereby realizing efficient and economical PWM dimming control.

[0088] In addition, to achieve the above purpose, refer to Figure 4 , Figure 4 This application also provides a dimming lamp, which includes any one of the dimming circuits described above.

[0089] In addition, this application also provides a dimming device. Figure 5 , Figure 5 Schematic diagram of the structure of the dimming device involved in the embodiment of the present application. The dimming device in the embodiment of the present application can be a device for locally running the driving method.

[0090] like Figure 5As shown, the dimming device of the embodiment of the present application may include: the above-mentioned dimming circuit; or, a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wi-Fi interface).

[0091] Memory 1005 is provided on the dimming device. Memory 1005 stores a program that, when executed by processor 1001, implements the corresponding operation. Memory 1005 is also used to store parameters used by the dimming device. Memory 1005 can be high-speed RAM or non-volatile memory, such as disk storage. Memory 1005 can also optionally be a storage device independent of processor 1001.

[0092] Those skilled in the art will understand that Figure 5 The dimming device structure shown in the figure does not constitute a limitation to the dimming device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0093] like Figure 5 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a driver for a dimming circuit.

[0094] exist Figure 5 In the dimming device shown, the processor 1001 can be used to call the driver program of the dimming circuit stored in the memory 1005 and execute the steps of the driving method as described above.

[0095] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0096] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0097] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium such as ROM / RAM, magnetic disk, or optical disk as mentioned above, and includes several instructions for enabling a dimming device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0098] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A dimming circuit, characterized in that: The dimming circuit includes: An input module, wherein the input module is configured to obtain a power supply modulation signal; a voltage divider module, wherein a voltage access terminal of the voltage divider module is electrically connected to the input module via a power input line, and the voltage divider module is configured to receive a supply voltage corresponding to the power modulation signal transmitted by the input module via the power input line, and perform voltage division processing according to the supply voltage to obtain a dimming voltage; A dimming control module, wherein the brightness control end of the dimming control module is electrically connected to the voltage output end of the voltage divider module, the load end of the dimming control module is electrically connected to the lamp, and the dimming control module is configured to perform dimming control on the lamp based on the dimming voltage transmitted by the voltage divider module.

2. The dimming circuit according to claim 1, wherein: The dimming control module includes a step-down unit, a resistance sampling unit, an overvoltage protection unit and an output unit; The first connection end of the resistance sampling unit is electrically connected to the freewheeling end of the step-down unit and the power supply end of the step-down unit, respectively; the second connection end of the resistance sampling unit is electrically connected to the chip selection end of the step-down unit and the positive output end of the output unit, respectively; the freewheeling end of the step-down unit is electrically connected to the voltage access end of the voltage divider module; The inductor end of the step-down unit is electrically connected to the negative output end of the output unit, and the overvoltage protection unit is electrically connected to the analog dimming end of the step-down unit and the voltage output end of the voltage divider module respectively, wherein the analog dimming end of the step-down unit constitutes the brightness control end of the dimming control module.

3. The dimming circuit according to claim 2, wherein: The step-down unit includes a control chip, a freewheeling diode, an inductor and a first capacitor; The first end of the control chip is electrically connected to the anode of the freewheeling diode and the second end of the inductor, respectively. The first end of the inductor constitutes the inductor end of the step-down unit and is electrically connected to the negative output end. The negative output end is electrically connected to the positive output end through the first capacitor. The cathode of the freewheeling diode constitutes the freewheeling end of the step-down unit, and is electrically connected to the voltage access end of the voltage divider module and the first connection end of the resistance sampling unit, respectively. The fifth end of the control chip constitutes the power supply end of the step-down unit and is electrically connected to the first connection end of the resistance sampling unit. The fourth end of the control chip constitutes the chip select end of the step-down unit and is electrically connected to the second connection end of the resistance sampling unit. The second end of the control chip is grounded. The third end of the control chip constitutes the analog dimming end of the step-down unit and is electrically connected to the overvoltage protection unit.

4. The dimming circuit according to claim 2, wherein: The resistance sampling unit includes a first resistor and a second resistor. The first end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the first resistor is electrically connected to the second end of the second resistor; A connection node where the first end of the first resistor is electrically connected to the first end of the second resistor constitutes a first connection end of the resistance sampling unit, and is electrically connected to the freewheeling end of the step-down unit and the power supply end of the step-down unit; The second end of the first resistor is electrically connected to the second end of the second resistor, and the connection node constitutes the second connection end of the resistance sampling unit, which is respectively electrically connected to the chip selection end and the positive output end of the step-down unit.

5. The dimming circuit according to claim 2, wherein: The overvoltage protection unit includes a first voltage regulator tube and a second capacitor; The first end of the second capacitor is electrically connected to the analog dimming end of the step-down unit and the cathode of the first voltage-stabilizing diode, respectively. The cathode of the first voltage-stabilizing diode is electrically connected to the voltage output end of the voltage divider module. The second end of the second capacitor and the anode of the first voltage-stabilizing diode are grounded, respectively.

6. The dimming circuit according to claim 1, wherein: The input module includes a third capacitor, a positive input terminal and a negative input terminal; The first end of the third capacitor is electrically connected to the positive input end, and the connection node where the first end of the third capacitor is electrically connected to the positive input end constitutes the voltage access end of the voltage divider module. The first end of the third capacitor and the negative input end are grounded.

7. The dimming circuit according to claim 1, wherein: The voltage dividing module includes a third resistor, a fourth resistor and a second voltage regulator tube; A first end of the third resistor is electrically connected to the power input line, a second end of the third resistor is electrically connected to the cathode of the second voltage regulator tube, and an anode of the second voltage regulator tube is electrically connected to the first end of the fourth resistor; The anode of the second voltage-stabilizing diode is electrically connected to the first end of the fourth resistor, forming a voltage output end of the voltage divider module, and is electrically connected to the brightness control end of the dimming control module; A second end of the fourth resistor is grounded.

8. A driving method for a dimming circuit, characterized in that: The driving method is applied to the dimming circuit according to any one of claims 1 to 7, and the driving method includes: Obtain power supply modulation signal through input module; After the voltage dividing module receives the power supply voltage corresponding to the power supply modulation signal transmitted by the input module via the power supply input line, the voltage dividing module divides the power supply voltage to obtain a dimming voltage; After the dimming control module receives the dimming voltage transmitted by the voltage divider module, the dimming control is performed on the lamp according to the dimming voltage.

9. A dimming lamp, comprising the dimming circuit according to any one of claims 1 to 7.

10. A dimming device, characterized in that: The dimming device includes the dimming lamp according to claim 9; or, The dimming device includes a processor, a memory, and a driver program stored in the memory and executable by the processor, wherein the driver program, when executed by the processor, implements the steps of the driving method according to claim 8.

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