An LED load control chip and an LED lighting circuit

Abstract

The utility model discloses a kind of LED load control chip and LED lighting circuit, it is related to the technical field of integrated circuit, the control chip is connected between the switch module with indicating lamp and LED load, comprising: first pin, second pin, third pin and the rest light module;The rest light module is connected with LED load by first pin, and is connected with constant-current drive chip for driving LED load to light by second pin;The rest light module is connected with the first resistance outside control chip by third pin, to make the first resistance and the second resistance in the rest light module series connection form voltage divider circuit for detecting the open-close state of switch module;Wherein, the rest light module is based on the voltage of voltage divider node of voltage divider circuit, control first pin and second pin are connected in the case where switch module is opened, and, control first pin and second pin are not connected in the case where switch module is closed.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, specifically to an LED load control chip and an LED lighting circuit. Background Technology

[0002] Switches with indicator lights are widely used in daily life; these lights are used to indicate the position or status of the switch.

[0003] Currently, even when the LED load connected to the switch is not working, the LED load may still be connected to the power supply through the indicator light on the switch, resulting in power consumption or even dim lighting.

[0004] Related technologies have proposed solutions for removing residual light from LED loads. However, existing solutions generally suffer from large circuit area, high cost, and high power consumption, making them unsuitable for applications requiring constant current drive for LED loads, and especially unsuitable for applications with multiple LED loads. Utility Model Content

[0005] This application provides an LED load control chip and an LED lighting circuit to overcome or improve the above-mentioned technical problems.

[0006] To address the aforementioned issues, this application discloses an LED load control chip for connecting a switch module with an indicator light to an LED load. The control chip includes a first pin, a second pin, a third pin, and a residual light removal module.

[0007] The residual light removal module is connected to the LED load through the first pin and to the constant current driver chip used to drive the LED load to light up through the second pin.

[0008] The redundant light removal module is connected to the first resistor outside the control chip through the third pin, so that the first resistor and the second resistor in the redundant light removal module are connected in series to form a voltage divider circuit for detecting the on / off state of the switch module.

[0009] The residual light removal module controls the connection between the first pin and the second pin when the switching module is on, based on the voltage of the voltage divider node of the voltage divider circuit, and controls the first pin and the second pin to be disconnected when the switching module is off.

[0010] In one embodiment of this application, the control chip contains one or more redundant light removal modules; the number of redundant light removal modules is equal to the number of constant current drive chips connected to the control chip.

[0011] In one embodiment of this application, the control chip has a total of M first pins and a total of N second and third pins. The glare removal module is connected to the LED load through m first pins. The glare removal module is connected to the constant current driving chip for driving the LED load to light up through n1 second pins. The glare removal module is connected to the first resistor outside the control chip through n2 third pins. The value of m is 1≤m≤M. The values ​​of n1 and n2 satisfy 1≤n1, 1≤n2, and n1+n2≤N.

[0012] In one embodiment of this application, m > 1, and the peripheral light removal module is connected to its corresponding LED load after being connected through m first pins.

[0013] In one embodiment of this application, in the control chip, both M and N are equal to 4.

[0014] In one embodiment of this application, the residual light removal module further includes a MOS switch, the drain of which is connected to a first pin and the source of which is connected to a second pin.

[0015] The gate of a MOS switch is turned on and off based on a reference voltage and the voltage divider node voltage provided by the voltage divider circuit.

[0016] In one embodiment of this application, the reference voltage is the turn-on threshold voltage of the MOS switch; in the redundant light removal module, the gate of the MOS switch is connected to the voltage divider node of the voltage divider circuit.

[0017] In one embodiment of this application, the peripheral light removal module further includes a reference voltage generation unit and a comparison unit; the reference voltage generation unit is used to output a reference voltage; one input terminal of the comparison unit is used to connect to the reference voltage, the other input terminal is used to connect to the voltage divider node voltage provided by the voltage divider circuit, and the output terminal is used to connect to the gate of the MOS switch.

[0018] In one embodiment of this application, the peripheral light removal module further includes a voltage regulator circuit or a voltage regulator diode, which is connected between the second pin and the third pin.

[0019] In a second aspect, embodiments of this application also disclose an LED lighting circuit, comprising:

[0020] The application includes a switch module with indicator lights, a constant current drive chip, an LED load, a first resistor, and an LED load control chip as described in the first aspect of the embodiments of this application.

[0021] This application has the following advantages:

[0022] This application discloses an LED load control chip for connecting a switch module with an indicator light to an LED load. The control chip includes a first pin, a second pin, a third pin, and a backlight removal module. The backlight removal module is connected to the LED load via the first pin and to a constant current driver chip for driving the LED load to light up via the second pin. The backlight removal module is connected to a first resistor outside the control chip via the third pin, so that the first resistor and the second resistor in the backlight removal module are connected in series to form a voltage divider circuit for detecting the on / off state of the switch module. The backlight removal module controls the first pin and the second pin to be connected when the switch module is on, and controls the first pin and the second pin to be disconnected when the switch module is off, based on the voltage of the voltage divider node of the voltage divider circuit. In this way, with a small area, low power consumption, and low cost, it avoids the problem of a small current flowing through the indicator light to the constant current driver chip when the switch module is off, which would cause the LED load to be connected to the power supply, resulting in power consumption or dim lighting. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0024] Figure 1 This is a partial structural diagram of an existing LED lighting circuit.

[0025] Figure 2 This is a schematic diagram of a portion of the LED lighting circuit that implements single-channel peripheral light removal in this application;

[0026] Figure 3 This is a schematic diagram of the LED lighting circuit that implements dual-path peripheral light removal in this application;

[0027] Figure 4 This is a schematic diagram of the structure of an LED load control chip according to this application. Figure 1 ;

[0028] Figure 5 This is a schematic diagram of the structure of an LED load control chip according to this application. Figure 2 .

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 - Removal module, 101 - MOS switch, 102 - Comparator unit, 103 - Zener diode, R2 - Second resistor; 200 - Switch module, 201 - Indicator light; 300 - LED load; U1 - Constant current drive chip, U2 - Control chip, R1 - First resistor. Detailed Implementation

[0031] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0032] Hereinafter, the terms "second," "first," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "second," "first," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the embodiments of this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly, and can refer to direct connection or indirect connection through an intermediate medium.

[0034] In this embodiment of the application, "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0035] refer to Figure 1 The existing LED lighting circuit shown includes a switch module 200 with an indicator light 201. The indicator light 201 and resistor R0 are connected in series, then in parallel with switch K1. The switch module 200 is connected in series with a rectifier bridge (AC-AC) between the live wire L and the neutral wire N of the AC power supply. The rectifier bridge AC-AC is connected to a constant current driver chip U1 used to drive the LED load 300 to light up. Figure 1 As shown, the constant current driver chip U1 is connected to the LED load 300 through inductor Lp, capacitor C1, and diode D1. The constant current driver chip U1 is also grounded and connected to the rectifier bridge through some resistors. These resistors have a similar structure to resistor R0 and are not labeled in the figure.

[0036] When the switch module 200 is turned on (i.e., switch K1 is closed), switch K1 is connected to the LED load 300 through the rectifier bridge and constant current drive chip U1, and the LED load 300 is lit.

[0037] When the switch module 200 is turned off (i.e., switch K1 is open), a small current will flow through the indicator light 201 to the constant current driver chip U1, causing the constant current driver chip U1 to work, thereby connecting the LED load 300 to the power supply, resulting in power consumption, or even dim lighting.

[0038] In view of this, this application provides an LED load control chip U2, with reference to... Figures 2-5 The control chip U2 is used to connect between the switch module 200 with indicator light 201 and the LED load 300. The control chip U2 includes a first pin, a second pin, a third pin, and a residual light removal module 100. The residual light removal module 100 is connected to the LED load 300 through the first pin and to the constant current driving chip U1 used to drive the LED load 300 to light up through the second pin. The residual light removal module 100 is connected to a first resistor R1 outside the control chip U2 through the third pin, so that the first resistor R1 and the second resistor R2 in the residual light removal module 100 are connected in series to form a voltage divider circuit for detecting the on / off state of the switch module 200. The residual light removal module 100 controls the first pin and the second pin to be connected when the switch module 200 is on, and controls the first pin and the second pin to be disconnected when the switch module 200 is off, based on the voltage of the voltage divider node of the voltage divider circuit.

[0039] This application adds a control chip U2 to the path between the switch module 200 with indicator light 201 and the LED load 300. Specifically, a control chip U2 is added to the path between the constant current driver chip U1 used to drive the LED load 300 and the LED load 300. The control chip U2 internally includes a glare removal module 100. The glare removal module 100 is connected to the LED load 300 via a first pin, and to the constant current driver chip U1 used to drive the LED load 300 via a second pin. The glare removal module 100 is connected to a first resistor R1 outside the control chip U2 via a third pin, so that the first resistor R1 and the second resistor R2 in the glare removal module 100 are connected in series to form a voltage divider circuit for detecting the on / off state of the switch module 200. Its working principle is as follows: the voltage divider circuit can detect the on / off state of the switch module 200. When the switch module 200 is in different states, the voltage division of the resistors in the voltage divider circuit will change, resulting in different voltage division node voltages (the voltage division node voltage refers to the node voltage between the first resistor R1 and the second resistor R2). Based on this, the peripheral light module 100 can identify the on / off state of the switch module 200 according to the voltage division node voltage, and control whether the paths of the first pin and the second pin inside the control chip U2 are connected or disconnected, thereby controlling whether the LED load 300 is connected to the constant current driver chip U1. Since the switch module 200 is connected to the LED load 300 through the constant current driver chip U1, the control of whether the LED load 300 is connected to the constant current driver chip U1 is realized, that is, the control of whether the LED load 300 is connected to the switch module 200 is realized.

[0040] Specifically, when the switch module 200 is turned on, the residual light removal module 100, based on the detected voltage change at the voltage divider node, controls the connection between the first and second pins, enabling the constant current driver chip U1 to drive the LED load 300 to light up normally. When the switch module 200 is turned off, the residual light removal module 100, based on the detected voltage change at the voltage divider node, controls the connection between the first and second pins to disconnect, thereby cutting off the connection between the LED load 300 and the constant current driver chip U1. This prevents the LED load 300 from being connected to the switch module 200, avoiding a small current flowing through the indicator light 201 to the constant current driver chip U1 when the switch module 200 is turned off (i.e., switch K1 is open), which could cause the LED load 300 to be connected to the power supply, resulting in power consumption or dim lighting.

[0041] It is worth noting that, theoretically, the aforementioned redundant light removal module 100 could also be implemented using two discrete resistors and a power MOS device mounted on a PCB board. However, using discrete components requires independent packaging and mounting space for each component, resulting in a larger circuit area. In contrast, this application integrates the function of controlling whether the LED load 300 is connected to the constant current drive chip U1 into the redundant light removal module 100, which is integrated into the control chip U2. This solves the problem of the LED load 300 being dimly lit when the switch module 200 with indicator light 201 is turned off with a smaller area.

[0042] Since the redundant light removal module 100 is integrated into the chip, the aforementioned power MOS device can be implemented using a conventional MOS device. Those skilled in the art should understand that the fabrication processes for conventional MOS devices and power MOS devices differ. Conventional MOS devices offer advantages such as low power consumption and high integration, resulting in lower heat generation and cost. Furthermore, the integrated design reduces connection losses between components, lowering power consumption and offering significant advantages in reducing area, saving costs, and reducing power consumption.

[0043] The first resistor R1 is positioned outside the control chip U2 and also serves as a current limiter, protecting the control chip U2. Furthermore, the first resistor R1 can function as a multi-purpose component, forming a voltage divider circuit with the second resistor R2 to effectively detect the on / off state of the switch module 200. The resistance values ​​of the second resistor R2 and the first resistor R1 can be configured based on actual applications, aiming to detect the on / off state of the switch module 200; this application does not impose any limitations on this.

[0044] In some embodiments, the control chip U2 may contain one or more glare removal modules 100; the number of glare removal modules 100 is equal to the number of constant current driver chips U1 connected to the control chip U2. In the field of LED lighting, typically one constant current driver chip U1 drives one LED load 300. Therefore, this application may provide one glare removal module 100 for each constant current driver chip U1 in the control chip U2. Each glare removal module 100 is connected to its corresponding constant current driver chip U1 through different second pins, and also to one LED load 300 driven by its corresponding constant current driver chip U1 through different first pins.

[0045] Correspondingly, each redundant light removal module 100 has a second resistor R2. When there are multiple redundant light removal modules 100, the first resistor R1 outside the control chip U2 can be one or more. If there is only one, each redundant light removal module 100 is connected to the first resistor R1 through a different third pin, thereby forming a voltage divider circuit by connecting its internal second resistor R2 in series with the first resistor R1. If there are multiple modules, refer to... Figure 2 Then, one second resistor R2 corresponds to one first resistor R1, and each de-light module 100 is connected to the corresponding first resistor R1 through its connected third pin, thereby realizing that the second resistor R2 and its corresponding first resistor R1 are connected in series to form a voltage divider circuit.

[0046] Each residual light removal module 100 can identify the on / off state of the switching module 200 based on the voltage of the voltage divider node of its corresponding voltage divider circuit, and control whether its corresponding first and second pins are connected or not. This controls whether the corresponding constant current driver chip U1 and the LED load 300 driven by that constant current driver chip U1 are connected or not, thus specifically addressing the problem of power consumption or dim lighting of each LED load 300 when the switching module 200 is off. For example... Figure 3 As shown in the diagram, this embodiment integrates multiple redundant light removal modules 100 into the same chip, sharing some circuit resources. This significantly reduces the circuit area and lowers costs while achieving multi-channel control. Furthermore, each redundant light removal module 100 performs independent redundant light removal processing, avoiding mutual interference and improving the stability and reliability of the entire lighting system.

[0047] Depending on whether there are one or more glare removal modules 100 in the control chip U2, the connection method of the control chip U2 can also be different even with the same number of pins. Specifically, in the control chip U2, the total number of first pins is M, and the total number of second and third pins is N; the glare removal module 100 is connected to the LED load 300 through m first pins; the glare removal module 100 is connected to the constant current driver chip U1 used to drive the LED load 300 to light up through n1 second pins; the glare removal module 100 is connected to the first resistor R1 outside the control chip U2 through n2 third pins; where the value of m is in the range of 1≤m≤M; the values ​​of n1 and n2 satisfy 1≤n1, 1≤n2, n1+n2≤N. This flexible pin connection setting method can adjust the number of connection pins between the glare removal module 100 and the LED load 300, the constant current driver chip U1, and the external resistor according to actual application requirements.

[0048] Optional, such as Figure 2 and Figure 3 As shown, in control chip U2, both M and N are equal to 4, meaning control chip U2 has 8 pins, numbered 1-8. These 8 pins are located on opposite sides of control chip U2. This application does not limit the position of the pins in control chip U2. Figure 2 and Figure 3 This is just one example to facilitate connection.

[0049] When there is only one redundant light removal module 100 in the control chip U2, it is preferable to set m > 1, and the numbers n1 and n2 can be adjusted, with n1 ≥ n2 or n2 ≥ n1. This redundant light removal module 100 is connected to its corresponding LED load 300 after being connected through m common first pins. Connecting the redundant light removal module 100 to the LED load 300 through multiple common first pins is beneficial for chip heat dissipation. Figure 2 As shown, m = M = 4, meaning that the redundant light removal module 100 is connected to the LED load 300 through four first pins, connected to the constant current drive chip U1 through three second pins, and connected to the first resistor R1 through one third pin.

[0050] Of course, if there are at least two redundant light removal modules 100 in the control chip U2, at least some of the redundant light removal modules 100 can be connected together through multiple first pins to drive the corresponding LED load 300. For example Figure 3As shown, there are two peripheral light removal modules 100 and two constant current drive chips U1. The control chip U2 is connected to one LED load 300 through two first pins (pin numbers 5 and 6) and then connected to another LED load 300 through two first pins (pin numbers 7 and 8). The four pins (pin numbers 1-4) on the left side of the control chip U2 are connected to two first resistors R1 and two constant current drive chips U1 respectively. Among them, pins 1 and 3 are both used as third pins, and pins 2 and 4 are both used as second pins.

[0051] from Figure 2 and Figure 3 It can be seen that the second and third pins can be shared, meaning that the pin connections of the control chip U2 in this application are flexible when implementing the afterglow removal function. For example... Figure 2 In the attached diagram, pin 1 can also be used as the second pin to connect to the constant current driver chip U1, and pins 2-4 can be used as the third pin to connect to the first resistor R1.

[0052] The spectral correction module 100 of this application can be implemented through various structures, but it generally includes a MOS switch 101. The drain of the MOS switch 101 is connected to a first pin, and the source of the MOS switch 101 is connected to a second pin. The gate of the MOS switch 101 controls its on / off state based on a reference voltage VREF and the voltage divider node voltage provided by the voltage divider circuit. The MOS switch 101 in this application is a common MOS transistor. Specifically, power MOS devices are discrete components, and their performance parameters have poor consistency, which can easily lead to differences in spectral correction effects between different circuits. Furthermore, discrete power MOS devices require a large package size, increasing the circuit area. The MOS switch 101 in this application is a common MOS transistor. Integrating the MOS switch 101 into the chip allows for process control to ensure the consistency of the MOS switch 101's performance parameters, improving the stability of the spectral correction effect. Simultaneously, the integrated MOS switch 101 does not require separate packaging, significantly reducing the circuit area.

[0053] Based on the residual light removal structure of the MOS switch 101, two implementation methods are illustrated below.

[0054] In one embodiment, reference Figure 4The reference voltage VREF is the turn-on threshold voltage of the MOS switch 101. In the redundant light removal module 100, the gate of the MOS switch 101 is connected to the voltage divider node of the voltage divider circuit. This embodiment uses the turn-on threshold voltage of the MOS switch 101 as the reference voltage VREF, which simplifies the internal circuit structure of the redundant light removal module 100. Under this setting, the voltage divider node voltage of the voltage divider circuit directly acts on the gate of the MOS switch 101. When the voltage divider node voltage reaches the turn-on threshold voltage of the MOS switch 101, the MOS switch 101 is turned on; otherwise, it is turned off.

[0055] In one embodiment, reference Figure 5 The peripheral light removal module 100 also includes a reference voltage VREF generation unit and a comparison unit 102. The reference voltage VREF generation unit is used to output the reference voltage VREF. One input terminal of the comparison unit 102 is used to connect to the reference voltage VREF, and the other input terminal is used to connect to the voltage divider node voltage provided by the voltage divider circuit. The output terminal is used to connect to the gate of the MOS switch 101. The comparison unit 102 can be implemented by a comparator, which is a conventional circuit in the art, and its structure is not limited. The comparator includes two input terminals and one output terminal. The two input terminals are a positive input terminal and a negative input terminal, respectively. This embodiment does not limit which input terminal is connected to the reference voltage VREF and which is connected to the voltage divider node voltage.

[0056] exist Figure 5 In the structure shown, the reference voltage VREF generation unit (not shown) can accurately generate a stable reference voltage VREF according to actual needs. The comparator unit 102 compares the voltage divider node voltage provided by the voltage divider circuit with the reference voltage VREF, and outputs a control signal to the gate of the MOS switch 101 based on the comparison result. For example, when the voltage divider node voltage is higher than the reference voltage VREF, the comparator unit 102 outputs a high-level signal to the gate of the MOS switch 101, turning on the MOS switch 101; when the voltage divider node voltage is lower than the reference voltage VREF, the comparator unit 102 outputs a low-level signal, turning off the MOS switch 101. Figure 4 The structure shown in this embodiment offers higher comparison accuracy.

[0057] In some embodiments, the redundant light removal module 100 further includes a voltage regulator circuit (not shown) or a Zener diode 103, which is connected between the second pin and the third pin. Adding a voltage regulator circuit or Zener diode 103 to the redundant light removal module 100 can protect the gate and source of the MOS switch 101 within it, ensuring that the MOS switch 101 operates in a safe region and protecting the control chip U2 for normal operation.

[0058] The voltage regulator circuit can be implemented with reference to the existing voltage regulator circuits in related technologies. This application will not elaborate on it or limit it. Figure 4 and Figure 5 The structure of Zener diode 103 is shown, which can be implemented using a Zener diode.

[0059] Based on the same inventive concept, the LED load control chip U2 provided in this solution can be applied to LED lighting circuits, such as... Figure 2 As shown, the LED lighting circuit includes: a switch module 200 with an indicator light 201, a constant current driver chip U1, an LED load 300, a first resistor R1, and an LED load 300 control chip U2 as described in this application. In various embodiments of this application, the constant current driver chip U1 can be implemented using a conventional constant current driver chip U1 from the prior art, and this application does not limit the model of the constant current driver chip U1. The constant current driver chip U1 can output a constant current to drive the LED load 300 to light up, maintaining its brightness stably.

[0060] The LED load 300 control chip U2 of this application can control one or more constant current drive chips U1 and their switching on and off with the LED load 300. This effectively solves the problem that when the switch module 200 is off (i.e., switch K1 is off), a small current will flow through the indicator light 201 to the constant current drive chip U1, causing the constant current drive chip U1 to work, which in turn causes the LED load 300 to be connected to the power supply, resulting in power consumption or even dim lighting.

[0061] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. An LED load control chip, characterized in that, The control chip, used to connect the switch module with indicator lights to the LED load, includes: a first pin, a second pin, a third pin, and a residual light removal module; The residual light removal module is connected to the LED load through a first pin and to a constant current driving chip for driving the LED load to light up through a second pin. The redundant light removal module is connected to a first resistor outside the control chip via a third pin, so that the first resistor and the second resistor in the redundant light removal module are connected in series to form a voltage divider circuit for detecting the on / off state of the switch module. Specifically, the residual light removal module controls the first pin and the second pin to be connected when the switch module is turned on, based on the voltage of the voltage divider node of the voltage divider circuit, and controls the first pin and the second pin to be disconnected when the switch module is turned off.

2. The LED load control chip according to claim 1, characterized in that, In the control chip, the redundant light removal module can be one or more. The number of the residual light removal modules is equal to the number of the constant current drive chips connected to the control chip.

3. The LED load control chip according to claim 2, characterized in that, In the control chip, the total number of first pins is M, and the total number of second and third pins is N. The residual light removal module is connected to the LED load through m first pins; The residual light removal module is connected to a constant current driving chip for driving the LED load to light up via n1 second pins; The residual light removal module is connected to a first resistor outside the control chip via n2 third pins; Where m takes values ​​of 1 ≤ m ≤ M; n1 and n2 take values ​​of 1 ≤ n1, 1 ≤ n2, and n1 + n2 ≤ N.

4. The LED load control chip according to claim 3, characterized in that, When m > 1, the peripheral light removal module is connected to the corresponding LED load after being connected through m first pins.

5. The LED load control chip according to claim 3 or 4, characterized in that, In the control chip, both M and N are equal to 4.

6. The LED load control chip according to any one of claims 1-3, characterized in that, The residual light removal module also includes a MOS switch, the drain of which is connected to a first pin and the source of which is connected to a second pin; The gate of the MOS switch is turned on and off based on a reference voltage and the voltage divider node voltage provided by the voltage divider circuit.

7. The LED load control chip according to claim 6, characterized in that, in, The reference voltage is the turn-on threshold voltage of the MOS switch; In the residual light removal module, the gate of the MOS switch is connected to the voltage divider node of the voltage divider circuit.

8. The LED load control chip according to claim 6, characterized in that, The residual light removal module also includes a reference voltage generation unit and a comparison unit; The reference voltage generating unit is used to output the reference voltage; One input terminal of the comparison unit is used to connect to the reference voltage, the other input terminal is used to connect to the voltage divider node voltage provided by the voltage divider circuit, and the output terminal is used to connect to the gate of the MOS switch.

9. The LED load control chip according to claim 6, characterized in that, The peripheral light removal module also includes a voltage regulator circuit or a voltage regulator diode, which is connected between the second pin and the third pin.

10. An LED lighting circuit, characterized in that, include: A switch module with indicator lights, a constant current drive chip, an LED load, a first resistor, and an LED load control chip as described in any one of claims 1-9.

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