CN220629623U

CN220629623U - Multipath dimming control circuit and LED lamp

Info

Publication number: CN220629623U
Application number: CN202320297924.7U
Authority: CN
Inventors: 张祥俊; 朱奕光; 李家健; 谢姜
Original assignee: Foshan Electrical and Lighting Co Ltd
Current assignee: Foshan Electrical and Lighting Co Ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2024-03-19
Anticipated expiration: 2033-02-21

Abstract

The utility model relates to the technical field of illumination, and discloses a multipath dimming control circuit and an LED lamp. The multipath dimming control circuit comprises a main control module, a switch module and a current setting module; the main control module is used for accessing high-voltage direct current and converting the high-voltage direct current into a load power supply suitable for the LED load to output; the switch module is provided with a public end, a first switch end and a second switch end; the public end is connected with the starting power supply VCC and is connected with the first switch end or the second switch end; the current setting module is connected with the first switch end and the main control module and is used for adjusting an output current sampling signal of the main control module when the public end is connected with the first switch end or the second switch end, so that the main control module adjusts the current of the output load power supply according to the output current sampling signal, and the brightness of the LED load is adjusted. The embodiment of the utility model can realize the dimming of the LED load, has low requirements on the performance of a chip, does not need to be externally connected with a silicon controlled rectifier dimmer, and does not influence the driving energy consumption of the whole circuit.

Description

Multipath dimming control circuit and LED lamp

Technical Field

The utility model relates to the technical field of illumination, in particular to a multipath dimming control circuit and an LED lamp.

Background

With the rapid development of intelligent illumination technology, LED intelligent illumination gradually becomes the main stream of green illumination. At present, most of the LED lamps on the market belong to conventional series, are mainly used for illumination, have single functions, however, along with the enhancement of energy conservation and environmental protection consciousness, the LED lamps with the dimming function are the main demands of people.

Currently, the dimming modes of the LED lamp in the market comprise PWM dimming and external dimmer dimming. However, PWM dimming has a high functional requirement on the chip and high cost, the external dimmer (the silicon controlled rectifier or the 0-10V dimmer) cannot achieve 100% compatibility, flickering may occur, and the dimming scheme of the external dimmer may be limited by the existing wiring of the client.

Therefore, how to be compatible with most power chips and installation scenes and realize stable dimming becomes a technical problem in the art.

Disclosure of Invention

The utility model aims to provide a multipath dimming control circuit and an LED lamp, which aim to solve the technical problems of how to be compatible with most power chips and installation scenes and realize stable dimming.

In a first aspect, there is provided a multi-path dimming control circuit comprising:

the main control module is used for accessing high-voltage direct current and converting the high-voltage direct current into a load power supply suitable for the LED load to output;

the switch module is provided with a public end, a first switch end and a second switch end; the public end is connected with a starting power supply and is connected with the first switch end or the second switch end;

the current setting module is connected with the first switch end and the main control module and is used for adjusting an output current sampling signal of the main control module when the public end is connected with the first switch end or the second switch end, so that the main control module adjusts the current of the output load power supply according to the output current sampling signal, and the brightness of the LED load is adjusted.

Further, the main control module comprises a power chip, a chip starting unit, an output current sampling unit, a driving unit and an output unit;

the power chip is respectively connected with the output current sampling unit, the chip starting unit, the driving unit and the output unit, the driving unit is connected with the driving unit, the output current sampling unit is connected with the driving unit, the input end of the driving unit is the input end of the main control module, and the output end of the output unit is the output end of the main control module.

Further, the power supply chip is a BOOST driving chip, and is provided with a chip power supply pin, a driving pin and an output current sampling pin;

the chip power supply pin is connected with the driving unit through the chip starting unit, and electricity is taken from the rectifying module through the driving unit; the driving pin is connected with the driving unit; the output current sampling pin is connected with the current setting module and the output unit.

The main control module further comprises an overvoltage detection unit, a driving current sampling unit, a loop compensation unit and a temperature monitoring unit, and the power supply chip is further provided with an overvoltage protection pin, a driving current sampling pin, a loop compensation pin and a temperature monitoring pin;

the overvoltage protection pin is connected with the output unit through the overvoltage detection unit, the driving current sampling pin is connected with the driving unit through the driving current sampling unit, the loop compensation pin is connected with the driving unit through the loop compensation unit, and the temperature monitoring pin is connected with the driving unit through the temperature monitoring unit.

Further, the current setting module comprises a current setting unit and a switching unit;

one end of the current setting unit is connected with the power chip, and the other end of the current setting unit is grounded through the switch unit; the switch unit is connected with the first switch end, is conducted when the public end is connected with the first switch end or the second switch end, and enables the current setting unit to be connected with the output current sampling unit in parallel when the switch unit is conducted.

Further, the number of the current setting modules is at least two groups, and the current setting modules are mutually connected in parallel;

the switch module is provided with at least two groups of first switch ends, and each first switch end is respectively and correspondingly connected with each current setting module in pairs.

one end of the current setting unit is connected with the power chip, and the other end of the current setting unit is grounded; the switch unit is connected with the current setting unit in parallel and is connected with the first switch end, and is conducted when the common end is connected with the first switch end or the second switch end, and the current setting unit is short-circuited when the common end is conducted.

Further, the multi-path dimming control circuit further includes:

and the rectification module is connected with the main control module and used for accessing external alternating current and converting the external alternating current into high-voltage direct current suitable for the main control module to output.

Further, the rectification module comprises an input filtering unit, a rectification unit and an output filtering unit;

the input filter unit, the rectifying unit and the output filter unit are sequentially connected, the input filter unit is used for accessing external alternating current, and the output end of the output filter unit is connected with the main control module.

In a second aspect, an LED lamp is provided, comprising the multi-path dimming control circuit of the first aspect.

The utility model has the beneficial effects that: the LED load dimming circuit is characterized in that a switch module and a current setting module are arranged on the basis of an original power supply structure, the switching-in state of the current setting module is set through the switch module, and when the current setting module is connected with a main control module, an output current sampling signal obtained by sampling current flowing through an LED load by the main control module is regulated, so that the main control module outputs a load power supply to the LED load according to different output current sampling signals before and after the current setting module is connected with the main control module, dimming of the LED load is realized, the requirement on the performance of a chip is low, an external silicon controlled dimmer is not needed, and the overall driving consumption of the circuit is not influenced.

Drawings

Fig. 1 is a schematic diagram of a multi-path dimming control circuit according to a first embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a multi-path dimming control circuit according to a second embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a multi-path dimming control circuit according to a third embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a multi-path dimming control circuit according to a fourth embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the present utility model will be further described with reference to the embodiments and the accompanying drawings.

In the description of the present utility model, the meaning of a number is not quantitative, and the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that elements are listed and may include other elements not expressly listed.

Dimming has been a focus of attention in the field of LED lighting, i.e. dimming, i.e. adjusting the brightness of a light source. For LED dimming, two main solutions are to linearly adjust the current of the LED (analog dimming) or to switch the driving current back and forth from 0 to the target current value at high frequencies (digital dimming). Setting the input current using thyristor dimming is the simplest method to implement analog dimming, and the principle of thyristor dimming is: when the input voltage reaches or exceeds the positive trigger voltage of the silicon controlled G electrode, the silicon controlled rectifier is conducted at the front edge of each AC voltage, when the current of the silicon controlled rectifier is reduced below the maintaining current of the silicon controlled rectifier, the silicon controlled rectifier is turned off, and the silicon controlled rectifier is turned off and can be turned on again after the input voltage reaches or exceeds the positive trigger voltage of the silicon controlled rectifier G electrode again, the capacitor is set to charge and discharge to regulate the change of the input voltage and the charging speed of the capacitor is regulated through the resistor, and the phase angle of the conduction of the silicon controlled rectifier can be changed, so that dimming is realized.

However, PWM dimming has a high functional requirement on the chip and high cost, the external dimmer (the silicon controlled rectifier or the 0-10V dimmer) cannot achieve 100% compatibility, flickering may occur, and the dimming scheme of the external dimmer may be limited by the existing wiring of the client.

Based on the above, the utility model provides the LED dimming circuit and the LED lamp, wherein alternating current commercial power is introduced through different input ends, and the output current sampling signal of the dimming circuit is changed, so that the dimming circuit regulates the current flowing through an LED load according to the output current sampling signal, thereby realizing dimming, and having high compatibility and low overall energy consumption.

According to a first aspect of the present utility model, there is provided a multi-path dimming control circuit.

As shown in fig. 1, in an embodiment, the multi-path dimming control circuit includes a main control module 1, a switch module 2, and a current setting module 3. The switch module 2 is provided with a public end, a first switch end S1 and a second switch end S2, the current setting module 3 is connected with the first switch end S1 and the main control module 1, and the public end is connected with the first switch end S1 or the second switch end S2.

When the LED load control device works, the input end of the main control module 1 is connected with high-voltage direct current, the output end of the main control module 1 is connected with an LED load, the main control module 1 converts the high-voltage direct current into load power supply suitable for the LED load to output, the LED load is driven to emit light, the current of the load power supply flowing through the LED load is sampled, an output current sampling signal is obtained, the public end is connected with a starting power supply VCC, the current setting module 3 regulates the output current sampling signal of the main control module 1 when the public end is connected with the first switch end S1 or the second switch end S2, and the main control module 1 regulates the current of the output load power supply according to the output current sampling signal, so that the brightness of the LED load is regulated.

In some embodiments, the current setting module 3 is started when the start-up power VCC is accessed. When the public end is connected with the second switch end S2, the current setting module 3 is not started, the main control module 1 samples the current of the load power supply flowing through the LED load and obtains an output current sampling signal, and outputs the load power supply to the LED load according to the output current sampling signal obtained by actual sampling, and the LED load is electrified to emit light; when the public terminal is connected with the first switch terminal S1, the current setting module 3 is connected with the starting power supply VCC through the first switch terminal S1 and is started, the started current setting module 3 regulates output current sampling signals, the main control module 1 receives the regulated output current sampling signals, the main control module 1 outputs a load power supply according to the regulated output current sampling signals, and the current of the load power supply is related to the output current sampling signals, so that the current of the load power supply flowing through the LED load is regulated, and the LED load dimming is realized.

In other embodiments, the current setting module 3 is activated when the activation power VCC is not connected. When the public end is connected with the first switch end S1, the current setting module 3 is connected with a starting power supply VCC through the first switch end S1, the current setting module 3 is not started, the main control module 1 samples the current of the load power supply flowing through the LED load and obtains an output current sampling signal, and outputs the load power supply to the LED load according to the output current sampling signal obtained by actual sampling, and the LED load is electrified to emit light; when the public terminal is connected with the second switch terminal S2, the current setting module 3 is not connected with the starting power supply VCC and is started, the started current setting module 3 regulates the output current sampling signal, the main control module 1 receives the regulated output current sampling signal, the main control module 1 outputs a load power supply according to the regulated output current sampling signal, and the current of the load power supply is related to the output current sampling signal, so that the current of the load power supply flowing through the LED load is regulated, and the LED load dimming is realized.

It should be noted that, the switch module 2 may be a dial switch or a key switch, but is not limited thereto, and a suitable model may be selected according to practical situations.

Therefore, the multipath dimming control circuit is provided with the switch module 2 and the current setting module 3 on the basis of the original power supply structure, the switch module 2 is used for setting the access state of the current setting module 3, the current setting module 3 is connected with the main control module 1, and the main control module 1 is regulated to sample the output current sampling signals obtained by the current flowing through the LED load, so that the main control module 1 outputs a load power supply to the LED load according to different output current sampling signals before and after the current setting module 3 is connected, the dimming of the LED load is realized, the requirement on the performance of a chip is low, an external silicon controlled rectifier dimmer is not needed, and the whole driving energy consumption of the circuit is not influenced.

The present utility model will be described in further detail with reference to specific examples.

As shown in fig. 2, in an embodiment, the main control module 1 includes a power chip U1, a chip start unit, an output current sampling unit, a driving unit, and an output unit. The power chip U1 is respectively connected with the output current sampling unit, the chip starting unit, the driving unit and the output unit, the driving unit is connected with the driving unit, the output current sampling unit is connected with the driving unit, the input end of the driving unit is the input end of the main control module 1, and the output end of the output unit is the output end of the main control module 1.

In this embodiment, the power chip U1 is a BOOST driving chip, and the power chip U1 is provided with a chip power supply pin VDD, a driving pin SW and an output current sampling pin FB. Preferably, the power chip U1 may be a chip with a model number BP2605, but not limited thereto, and a suitable model number may be selected according to practical situations.

The chip power supply pin VDD is connected with the driving unit through the chip starting unit, and electricity is taken from the rectifying module through the driving unit; the driving pin SW is connected with the driving unit; the output current sampling pin FB connects the current setting module 3 and the output unit.

The chip starting unit comprises a first resistor R1 and a first electrolytic capacitor CE1. The first resistor R1 is connected between the driving unit and the chip power supply pin VDD, the first resistor R1 is used for dividing and limiting current when the high-voltage direct current is supplied to the chip power supply pin VDD, the first resistor R1 charges the first electrolytic capacitor CE1 after being connected with the high-voltage direct current, and when the voltage of the chip power supply pin VDD reaches the starting threshold value of the power chip U1, the power chip U1 is started.

The output current sampling unit comprises a first current sampling resistor RS1, a second resistor R2, a first diode D1 and a first capacitor C1. The output current sampling pin FB, the second resistor R2 and the first current sampling resistor RS1 are serially connected in sequence, one end, far away from the second resistor R2, of the first current sampling resistor RS1 is grounded, the anode of the first diode D1 is connected with one end, close to the second resistor R2, of the first current sampling resistor RS1, the cathode of the first diode D1 is grounded, the first capacitor C1 is connected with the first current sampling resistor RS1 in parallel, the second resistor R2 is used for outputting partial pressure and current limiting when the current sampling pin FB samples a load power supply, the first current sampling resistor RS1 is used for setting an output current sampling signal obtained by sampling LED load current by the power supply chip U1, the first diode D1 is used for clamping the first current sampling resistor RS1 at 0.7V so as to prevent the first current sampling resistor RS1 from being damaged due to overcurrent, and the first capacitor C1 is used for filtering alternating current interference signals of the output current sampling pin FB.

The driving unit includes an energy storage inductor T1, a first inductor L1, a first MOS transistor Q1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a second electrolytic capacitor CE2. The energy storage inductor T1 is connected with high-voltage direct current, the grid electrode of the first MOS tube Q1 is connected with the chip power supply pin VDD through the fourth resistor R4, the source electrode of the first MOS tube Q1 is connected with the driving pin SW, the drain electrode of the first MOS tube Q1 is connected with the energy storage inductor T1, and the eighth capacitor C8 is the grid parasitic capacitor of the first MOS tube Q1. The power chip U1 drives the first MOS tube Q1 in a source driving mode, after the power chip U1 is started, the switch MOS tube is arranged in the driving pin SW, the drain electrode of the switch MOS tube is connected with the source electrode of the first MOS tube Q1, when the switch MOS tube is turned on, the source electrode of the first MOS tube Q1 is grounded through the drain electrode of the switch MOS tube, the chip power supply pin VDD supplies power to the grid electrode of the first MOS tube Q1 and charges the eighth capacitor C8, the grid electrode voltage of the first MOS tube Q1 is gradually increased until the on threshold voltage is reached, the first MOS tube Q1 is turned on when the switch MOS tube is turned on, the inductance current of the energy storage inductor T1 is increased from zero when the first MOS tube Q1 is turned off, the inductance current of the energy storage inductor T1 is reduced from a peak value, and when the inductance current of the energy storage inductor T1 is reduced to zero, the power chip U1 is turned on the first MOS tube Q1 again. In the process that the inductance current of the energy storage inductor T1 is reduced from the peak value, the energy storage inductor T1 supplies power to the output unit through the first inductor L1 and the third diode D3, and in the process that the inductance current of the energy storage inductor T1 is increased from zero, the second diode D2 supplies power to the output unit so as to accelerate the electric quantity storage of the first energy storage inductor T1 and the second electrolytic capacitor CE2. The fourth resistor R4 is used for limiting current of the gate of the first MOS transistor Q1, the fourth diode D4 is used for increasing the switching speed of the first MOS transistor Q1, the fourth capacitor C4, the fifth capacitor C5 and the third resistor R3 are used for filtering spike pulses when the first MOS transistor Q1 is switched, the second capacitor C2, the third capacitor C3, the sixth capacitor C6 and the seventh capacitor C7 are all used for filtering, the fifth resistor R5 is used as a dummy load, the anode of the fifth diode D5 is connected with the driving pin SW, and the cathode of the fifth diode D5 is connected with the chip power supply pin VDD and is used for providing voltage stabilizing protection for the chip power supply pin VDD.

The output unit comprises a second inductance L2. The second inductor L2 is used as a common mode inductor and is respectively connected with the driving unit, the output current sampling unit and the LED load.

In this embodiment, the main control module 1 further includes an overvoltage detection unit, a driving current sampling unit, a loop compensation unit, and a temperature monitoring unit, and the power chip U1 is further provided with an overvoltage protection pin OVP, a driving current sampling pin CS, a loop compensation pin COMP, and a temperature monitoring pin RTH.

The overvoltage protection pin OVP is connected with the output unit through the overvoltage detection unit, the driving current sampling pin CS is connected with the driving unit through the driving current sampling unit, the loop compensation pin COMP is connected with the driving unit through the loop compensation unit, and the temperature monitoring pin RTH is connected with the driving unit through the temperature monitoring unit.

The overvoltage detection unit includes a sixth resistor R6, a seventh resistor R7, and a ninth capacitor C9. The sixth resistor R6 and the seventh resistor R7 are used for detecting the voltage of the load power supply output by the output unit, and the ninth capacitor C9 is used for filtering the ac interference signal of the overvoltage protection pin OVP.

The driving current sampling unit includes a second current sampling resistor RS2 and a tenth capacitor C10. One end of the second current sampling resistor RS2 is connected with the driving current sampling pin CS, the other end of the second current sampling resistor RS2 is connected with the driving unit, the tenth capacitor C10 is connected with the second current sampling resistor RS2 in parallel, the second current sampling resistor RS2 is used for setting a driving current sampling signal obtained by the driving unit (the first MOS tube Q1) sampled by the power chip U1, and the tenth capacitor C10 is used for filtering alternating current interference signals of the driving current sampling pin CS.

The loop compensation unit includes an eleventh capacitor C11. One end of the eleventh capacitor C11 is connected to the loop compensation pin COMP, the other end of the eleventh capacitor C11 is grounded, and the eleventh capacitor C11 is used for loop compensation of the output voltage of the main control module 1.

The temperature monitoring unit includes an eighth resistor R8. One end of the eighth resistor R8 is connected with the temperature monitoring pin RTH, the other end of the eighth resistor R8 is grounded, and the eighth resistor R8 is used for setting a overheat regulation temperature node of the power chip U1.

As shown in fig. 2, in an embodiment, the current setting module 3 includes a current setting unit and a switching unit.

One end of the current setting unit is connected with the power chip U1, and the other end of the current setting unit is grounded through the switch unit; the switch unit is connected with the first switch end S1, is conducted when the common end is connected with the first switch end S1 or the second switch end S2, and enables the current setting unit to be connected with the output current sampling unit in parallel when the switch unit is conducted.

In this embodiment, the current setting unit includes a second MOS transistor Q2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The second MOS tube Q2 is an N-type MOS tube, the grid electrode of the second MOS tube Q2 is connected with the first switch end S1 through an eleventh resistor R11, the drain electrode of the second MOS tube Q2 is connected with the output current collection pin through a ninth resistor R9, the source electrode of the second MOS tube Q2 is grounded, and a tenth resistor R10 is connected between the grid electrode and the source electrode of the second MOS tube Q2. The ninth resistor R9 is used for adjusting an output current sampling signal obtained when the main control module 1 samples the current of the load power supply flowing through the LED load, the tenth resistor R10 is used as a bias resistor of the second MOS transistor Q2, and the eleventh resistor R11 is used for voltage division and current limitation when the gate of the second MOS transistor Q2 is connected to the starting power supply VCC.

When the LED load is in operation, when the public end is connected with the second switch end S2, the grid voltage of the second MOS tube Q2 is lower than the on voltage of the second MOS tube Q2, the second MOS tube Q2 is turned off, the power chip U1 samples the current of the load power supply flowing through the LED load through the first current sampling resistor RS1 and obtains an actual output current sampling signal, and outputs the load power supply to the LED load according to the output current sampling signal obtained by actual sampling, and the LED load is electrified to emit light; when the public end is connected with the first switch end S1, the grid electrode of the second MOS tube Q2 is connected with the starting power supply VCC, the second MOS tube Q2 is turned on, the ninth resistor R9 is connected with the first current sampling resistor RS1 in parallel, the equivalent resistor of the power supply chip U1 connected with the first current sampling resistor RS1 in parallel through the ninth resistor R9 samples the current of the load power supply flowing through the LED load, the obtained output current sampling signal is different from the actual output current sampling signal, the power supply chip U1 outputs the load power supply according to the adjusted output current sampling signal, the current of the load power supply changes along with the change of the output current sampling signal, and therefore the current of the load power supply flowing through the LED load is adjusted, and the LED load dimming is achieved.

In some embodiments, the number of the current setting modules 3 is at least two, each current setting module 3 is connected in parallel, the switch module 2 is provided with at least two groups of first switch ends S1, and each first switch end S1 is respectively connected with each current setting module 3 in a corresponding mode. When the common end is connected with one first switch end S1, the current setting modules 3 corresponding to the first switch ends S1 regulate output current sampling signals of the main control module 1, specifically, the current setting modules 3 are connected with the first current sampling resistor RS1 in parallel, so that the power supply chip U1 samples current of a load power supply flowing through an LED load through an equivalent resistor after being connected in parallel, multiple output current sampling signals can be obtained, and multi-stage dimming of the LED load is realized.

As shown in fig. 3, in one embodiment, the number of the current setting modules 3 is two, one set of the current setting modules 3 includes a second MOS transistor Q2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11, and the other set of the current setting modules 3 includes a second MOS transistor Q2, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14. The resistance of the ninth resistor R9 is different from that of the twelfth resistor R12, and when the common end is connected with the two first switch ends S1 or the second switch end S2, the external resistors of the output current sampling pin FB are different, so that three-stage dimming of the LED load is realized.

As shown in fig. 4, in an embodiment, the current setting module 3 includes a current setting unit and a switching unit. One end of the current setting unit is connected with the power chip U1, and the other end of the current setting unit is grounded; the switch unit is connected with the current setting unit in parallel and is connected with the first switch end S1, and is conducted when the common end is connected with the first switch end S1 or the second switch end S2, and the current setting unit is short-circuited when the switch unit is conducted.

In this embodiment, the current setting unit includes a second MOS transistor Q2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The ninth resistor R9 is connected with the first current sampling resistor RS1 in series, the second MOS tube Q2 is an N-type MOS tube, the grid electrode of the second MOS tube Q2 is connected with the first switch end S1 through an eleventh resistor R11, the drain electrode of the second MOS tube Q2 is connected with one end of the ninth resistor R9, the source electrode of the second MOS tube Q2 is connected with the other end of the ninth resistor R9, and the tenth resistor R10 is connected between the grid electrode and the source electrode of the second MOS tube Q2.

When the LED load power supply works, when the public end is connected with a first switch end S1, the grid electrode of a second MOS tube Q2 is connected with a starting power supply VCC, the second MOS tube Q2 is turned on and short-circuits a ninth resistor R9, a first current sampling resistor RS1 is grounded through the second MOS tube Q2, a power supply chip U1 samples the current of a load power supply flowing through an LED load through the first current sampling resistor RS1 and obtains an actual output current sampling signal, and the load power supply is output to the LED load according to the output current sampling signal obtained by actual sampling, and the LED load is electrified to emit light; when the public terminal is connected with the second switch terminal S2, the grid voltage of the second MOS tube Q2 is lower than the on voltage of the second MOS tube Q2, the second MOS tube Q2 is turned off, the ninth resistor R9 is connected with the first current sampling resistor RS1 in series, the equivalent resistor after the power chip U1 is connected with the first current sampling resistor RS1 in parallel through the ninth resistor R9 is used for sampling the current of the load power supply flowing through the LED load, the obtained output current sampling signal is different from the actual output current sampling signal, the power chip U1 outputs the load power supply according to the adjusted output current sampling signal, and the current of the load power supply changes along with the change of the output current sampling signal, so that the current of the load power supply flowing through the LED load is adjusted, and the LED load dimming is realized.

As shown in fig. 2, in an embodiment, the multi-path dimming control circuit further includes a rectifying module 4. The rectifying module 4 is connected with the main control module 1 and is used for accessing external alternating current and converting the external alternating current into high-voltage direct current suitable for the main control module 1 to output.

In this embodiment, the rectifying module 4 includes an input filtering unit, a rectifying unit, and an output filtering unit. The input filtering unit, the rectifying unit and the output filtering unit are sequentially connected, the input filtering unit is used for accessing external alternating current, and the output end of the output filtering unit is connected with the main control module 1.

The input filter unit comprises a fuse F1, a piezoresistor RV1, a fifteenth resistor R15 and a twelfth capacitor C12, the rectifying unit comprises a rectifying bridge BD1, a rectifying input positive end, a rectifying input reverse end, a rectifying output end and a rectifying grounding end are arranged on the rectifying bridge BD1, and the output filter unit comprises a third inductor L3, a sixteenth resistor R16, a thirteenth capacitor C13 and a fourteenth capacitor C14.

The positive rectifying input end is used for being connected with a live wire L through a fuse F1, the reverse rectifying input end is used for a zero line N, one end of a piezoresistor RV1, one end of a fifteenth resistor R15 and one end of a twelfth capacitor C12 are respectively connected with the positive rectifying input end, the other end of the piezoresistor RV1, the other end of the fifteenth resistor R15 and the other end of the twelfth capacitor C12 are respectively connected with the reverse rectifying input end, a CLC filtering structure is formed by a third inductor L3, a thirteenth capacitor C13 and a fourteenth capacitor C14, and a sixteenth resistor R16 is connected with the third inductor L3 in parallel. The fuse F1 is used for overcurrent protection, the varistor RV1 is used for voltage clamping and absorbing redundant current when the circuit is subjected to overvoltage, the twelfth capacitor C12 is used as a common-mode capacitor, the fifteenth resistor R15 is used for releasing the electric energy of the twelfth capacitor C12, the rectifier bridge BD1 converts external alternating current into high-voltage direct current, the third inductor L3, the thirteenth capacitor C13 and the fourteenth capacitor C14 are used for filtering alternating current interference signals in the high-voltage direct current, and the sixteenth resistor R16 is used for releasing the electric energy of the third inductor L3, the thirteenth capacitor C13 and the fourteenth capacitor C14.

When the device works, 220V alternating current commercial power sequentially passes through the input filtering unit, the rectifying unit and the output filtering unit, and the output filtering unit outputs relatively stable high-voltage direct current.

According to a second aspect of the present utility model, an LED lamp is provided, where the LED lamp includes the above-mentioned multi-path dimming control circuit, and the specific structure of the multi-path dimming control circuit refers to the above-mentioned embodiments, and since the LED lamp of the present utility model adopts all the technical solutions of all the above-mentioned embodiments, at least the LED lamp has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be described in detail herein.

In summary, the multi-path dimming control circuit and the LED lamp provided by the embodiment of the utility model are provided with the switch module and the current setting module on the basis of the original power supply structure, the switch module is used for setting the access state of the current setting module, and the current setting module is connected with the main control module to regulate the output current sampling signal obtained by sampling the current flowing through the LED load by the main control module, so that the main control module outputs a load power supply to the LED load according to different output current sampling signals before and after the current setting module is connected, the dimming of the LED load is realized, the requirement on the performance of a chip is low, the external silicon controlled rectifier dimmer is not needed, and the whole driving consumption of the circuit is not influenced.

The embodiments described in the embodiments of the present utility model are for more clearly describing the technical solutions of the embodiments of the present utility model, and do not constitute a limitation on the technical solutions provided by the embodiments of the present utility model, and those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present utility model are equally applicable to similar technical problems.

It will be appreciated by persons skilled in the art that the embodiments of the utility model are not limited by the illustrations, and that more or fewer steps than those shown may be included, or certain steps may be combined, or different steps may be included.

The apparatus embodiments described above are merely illustrative, in that the circuitry illustrated as separate components may or may not be physically separate, i.e., may be located in one place, or may be distributed over multiple network circuits. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/circuits in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.

The terms "first," "second," "third," "fourth," and the like in the description of the utility model and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or circuits is not necessarily limited to those steps or circuits that are expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in the present utility model, "at least one (item)" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

In the several embodiments provided by the present utility model, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the above-described circuit division is merely a logical function division, and there may be other division manners in which a plurality of circuits or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or circuits, which may be in electrical, mechanical or other form.

The circuits described above as separate components may or may not be physically separate, and components shown as circuits may or may not be physical circuits, i.e., may be located in one place, or may be distributed over multiple network circuits. Some or all of the circuits may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional circuit in each embodiment of the present utility model may be integrated in one processing circuit, or each circuit may exist alone physically, or two or more circuits may be integrated in one circuit. The integrated circuit may be implemented in hardware or in software functional circuits.

The preferred embodiments of the present utility model have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the embodiments of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present utility model shall fall within the scope of the claims of the embodiments of the present utility model.

Claims

1. A multiple dimming control circuit, comprising:

the current setting module is connected with the first switch end and the main control module and is used for adjusting an output current sampling signal of the main control module when the public end is connected with the first switch end or the second switch end, so that the main control module adjusts the current of an output load power supply according to the output current sampling signal, and the brightness of the LED load is adjusted.

2. The multi-channel dimming control circuit of claim 1, wherein,

the main control module comprises a power chip, a chip starting unit, an output current sampling unit, a driving unit and an output unit;

3. The multi-channel dimming control circuit of claim 2, wherein,

further comprises: the rectification module is connected with the main control module and is used for accessing external alternating current and converting the external alternating current into high-voltage direct current suitable for the main control module to output;

the power supply chip is a BOOST driving chip and is provided with a chip power supply pin, a driving pin and an output current sampling pin;

the chip power supply pin is connected with the driving unit through the chip starting unit, and electricity is taken from the rectifying module through the driving unit; the driving pin is connected with the driving unit; and the output current sampling pin is connected with the current setting module and the output unit.

4. The multi-channel dimming control circuit of claim 3, wherein,

5. The multi-channel dimming control circuit as claimed in any one of claims 2 to 4,

the current setting module comprises a current setting unit and a switching unit;

one end of the current setting unit is connected with the power chip, and the other end of the current setting unit is grounded through the switch unit; the switch unit is connected with the first switch end, is conducted when the public end is connected with the first switch end or the second switch end, and enables the current setting unit to be connected with the output current sampling unit in parallel when the public end is conducted.

6. The multi-channel dimming control circuit of claim 5, wherein,

the number of the current setting modules is at least two groups, and the current setting modules are mutually connected in parallel;

7. The multi-channel dimming control circuit as claimed in any one of claims 2 to 4,

8. The multi-channel dimming control circuit of claim 3, wherein,

the rectification module comprises an input filtering unit, a rectification unit and an output filtering unit;

the input filter unit, the rectification unit and the output filter unit are sequentially connected, the input filter unit is used for accessing external alternating current, and the output end of the output filter unit is connected with the main control module.

9. An LED lamp comprising the multi-path dimming control circuit of any one of claims 1 to 8.