An IC chip, a driving circuit and a lighting control system

Abstract

The present invention provides an IC chip, a driving circuit and a lamp control system. The IC chip includes a control module, an I 2 C communication protocol module, at least one linear constant current circuit, wherein I 2 C communication protocol module, receiving external I 2 C communication protocol controller sends I 2 C protocol communication signal, based on I 2 C protocol communication signal generates a control command for controlling the output current of at least one linear constant current circuit and sends it to the control module; the control module generates a corresponding control signal according to the control command, uses the control signal to control the output current of at least one linear constant current circuit, and controls the current of the LED load connected to the corresponding output pin through at least one linear constant current circuit. 2 C communication protocol module and linear constant current circuit are integrated on one IC chip, which can be connected through external I 2 The C communication protocol controller can more conveniently realize corresponding control of the LED load connected to the output pin of the IC chip.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to an IC chip, a drive circuit and a lamp control system. Background Art

[0002] With the continuous advancement of lighting technology, people's requirements for lighting are becoming increasingly demanding. Many existing lamps offer color-changing and temperature-controlled dimming. However, if a lamp contains multiple lamp units, how to effectively control each lamp unit independently, that is, how to achieve dimming and color adjustment of the entire lamp unit by dimming and coloring each lamp unit individually, is a technical problem that needs to be solved. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide an IC chip, a driving circuit and a lighting control system that overcome the above problems or at least partially solve the above problems.

[0004] According to one aspect of the present invention, an IC chip is provided, characterized in that it includes a control module, an IC connected to the control module, 2 C communication protocol module, at least one linear constant current circuit, wherein the IC chip has 2 A DIM pin connected to the C communication protocol module, an output pin connected to the linear constant current circuit, and the output pin is used to connect to an LED load;

[0005] I 2 C communication protocol module, configured to utilize the DIM pin to receive external I 2 C communication protocol controller sends I 2 C protocol communication signal, according to the I 2 C protocol communication signal generates a control command for controlling the output current of at least one linear constant current circuit and sends it to the control module;

[0006] The control module is configured to generate a corresponding control signal based on the control command, use the control signal to control the output current of the at least one linear constant current circuit, and then control the LED load current connected to the corresponding output pin through the at least one linear constant current circuit.

[0007] Optionally, the linear constant current circuit includes a constant current driving module connected to the control module,

[0008] For a linear constant current circuit, the control module uses a control signal to control the reference voltage of the constant current driving module in the linear constant current circuit, thereby controlling the output current of the linear constant current circuit and the corresponding LED load current;

[0009] If the reference voltage of the constant current driving module decreases, the output current of the linear constant current circuit and the corresponding LED load current both decrease.

[0010] Optionally, the linear constant current circuit further includes an output voltage sampling module and active components connected thereto, wherein:

[0011] The output voltage sampling module is further connected to the control module, and the active element is further connected to the constant current driving module;

[0012] For a linear constant current circuit, the output voltage sampling module is configured to sample the output voltage of the linear constant current circuit and provide the sampled output voltage to the control module. If the lowest output voltage value of the output voltage provided to the control module by the output voltage sampling module within a preset period is less than a set value, the control module controls the reference voltage of the constant current driving module in the linear constant current circuit to decrease, the constant current driving module controls the active element to be in an amplifying state, and the output current of the linear constant current circuit decreases until the sampled lowest output voltage value of the linear constant current circuit is greater than the set value.

[0013] Optionally, for a linear constant current circuit, the output voltage sampling module is further configured to provide the sampled output voltage of the linear constant current circuit to the control module. If the output voltage provided to the control module is greater than a first preset voltage value, the control module controls the reference voltage of the constant current driving module in the linear constant current circuit to decrease, and the constant current driving module controls the active element to operate in a cut-off state. The output voltage of the linear constant current circuit increases, and the LED load voltage decreases.

[0014] Optionally, the linear constant current circuit includes an output current sampling module, the IC chip has at least one enable pin, and one enable pin is connected to one output current sampling module;

[0015] For a linear constant current circuit, the output current sampling module is connected to the constant current driving module, the control module, the active element, and the enable pin in the linear constant current circuit respectively;

[0016] The output current sampling module is configured to sample the voltage value at the enable pin connected thereto and provide the sample to the constant current driving module in the linear constant current circuit. The constant current driving module calculates an output signal based on the received voltage value and its reference voltage, and uses the output signal to control the corresponding active element to be in an amplified state, thereby providing a constant current to the corresponding LED load.

[0017] The output current sampling module is further configured to sample the voltage value at the enable pin connected thereto. If the sampled voltage value is greater than a second preset voltage value, the control module is controlled to reduce the reference voltage of the corresponding constant current driving module. The constant current driving module controls the corresponding active element to operate in a cut-off state, and the output current of the corresponding linear constant current circuit is reduced to zero.

[0018] Optionally, the IC chip further includes:

[0019] an over-temperature protection circuit, connected to the control module and configured to detect the temperature of the IC chip;

[0020] If the over-temperature protection circuit detects that the temperature of the IC chip is higher than a preset temperature range, the control module is controlled to reduce the reference voltage of the constant current driving module in the at least one linear constant current circuit, so that the output current of the at least one linear constant current circuit is reduced until the temperature of the IC chip is within the preset temperature range;

[0021] If the over-temperature protection circuit detects that the temperature of the IC chip is lower than the preset temperature range, the control module is controlled to increase the reference voltage of the constant current driving module in the at least one linear constant current circuit, and the output current of the at least one linear constant current circuit increases until the output current of the linear constant current circuit increases to a preset maximum current, so that the temperature of the IC chip is within the preset temperature range.

[0022] Optionally, the active element includes a triode or a field effect transistor;

[0023] Among them, if the active element is a field effect transistor, the gate of the field effect transistor is connected to the constant current driving module in the linear constant current circuit where it is located, the source is connected to the output current sampling module in the linear constant current circuit where it is located, and the drain is connected to the output voltage sampling module in the linear constant current circuit where it is located.

[0024] Optionally, the IC chip further includes a power pin Vin, a power supply pin VCC and an internal power circuit.

[0025] The power supply pin Vin is connected to the internal power supply circuit;

[0026] The internal power supply circuit is connected to the power supply pin VCC and the control module, and is configured to supply power to the control module.

[0027] Optionally, the IC chip includes two linear constant current circuits, two output pins, and two enable pins, wherein:

[0028] An output voltage sampling module included in a linear constant current circuit is connected to an output pin, and an output current sampling module included in the linear constant current circuit is connected to an enable pin;

[0029] The output voltage sampling module included in another linear constant current circuit is connected to another output pin, and the output current sampling module included in the linear constant current circuit is connected to another enable pin;

[0030] The constant current driving modules, the output voltage sampling module and the output current sampling module of the two linear constant current circuits are also connected to the control module respectively.

[0031] According to another aspect of the present invention, a driving circuit is provided, comprising: a switching element, a rectifier module, a capacitor element C, at least one sampling resistor, I 2 C communication protocol interface, an IC chip as described in any of the above embodiments, wherein:

[0032] The rectifier module is connected to the switch element and the capacitor element C respectively;

[0033] One end of a sampling resistor is connected to an enable pin, and the other end is grounded, and the sampling resistor is configured to convert the output current of the linear constant current circuit into a voltage value and provide it to the output current sampling module;

[0034] I 2 C communication protocol interface, connected to the DIM pin and ground pin of the IC chip respectively, configured to receive external I 2 C communication protocol controller sends I 2 C protocol communication signal, and the received I 2 C protocol communication signal is sent to the IC chip 2 C communication protocol module.

[0035] Optionally, the driving circuit further includes a capacitor element C2, one end of the capacitor element C2 is connected to the power supply pin VCC, and the other end is grounded.

[0036] According to another aspect of the present invention, a lighting control system is provided, comprising: 2 C communication protocol controller and a plurality of lamps connected thereto and provided with a driving circuit according to any of the above embodiments, wherein the driving circuit of each lamp comprises an I 2C communication protocol module is pre-configured with a unique I 2 C protocol communication address code;

[0037] The lamp is configured to drive the I 2 C communication protocol module to the I 2 C communication protocol controller sends pre-configured I 2 C protocol communication address code;

[0038] I 2 C communication protocol controller, configured to receive I 2 C protocol communication address code and store it, and receive the control instruction sent by the user, generate I 2 C protocol communication signal, I 2 C protocol communication signals are sent to the corresponding I 2 In the lamp corresponding to the C protocol communication address code;

[0039] Any of the lamps includes an LED load, the LED load is connected to the output pin of the IC chip in the lamp, and the lamp is further configured to use the received I 2 C protocol communication signal controls the current of its own LED load.

[0040] In the embodiment of the present invention, the control module, I 2 C communication protocol module and linear constant current circuit are integrated on one IC chip, which can not only reduce the peripheral components of the driver, save component cost and production cost of lamps, but also can be controlled by external I 2 The C communication protocol controller more conveniently controls the LED loads connected to the IC chip output pins. Furthermore, by placing multiple IC chips in different lamp units, each can be effectively controlled independently. Furthermore, by freely combining lamp units to form a modular lamp, not only can the production cost of the lamp be reduced, but also the packaging cost of the lamp can be reduced.

[0041] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below.

[0042] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0044] Figure 1 A schematic diagram of the internal structure of an IC chip according to an embodiment of the present invention is shown;

[0045] Figure 2a A schematic diagram of a circuit structure included in an output voltage sampling module in an IC chip is shown;

[0046] Figure 2b Another circuit structure diagram of the output voltage sampling module in the IC chip is shown;

[0047] Figure 3 shows a schematic diagram of the internal structure of an IC chip according to another embodiment of the present invention;

[0048] Figure 4 shows a schematic structural diagram of a driving circuit according to an embodiment of the present invention;

[0049] Figure 5 A schematic structural diagram of a lighting control system according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0050] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] To solve the above technical problems, an embodiment of the present invention provides an IC chip. Figure 1 The IC chip includes a control module 1, an I 2 C communication protocol module 2, at least one linear constant current circuit. Figure 1 It is shown that the IC chip includes one linear constant current circuit 10. Of course, this is only for illustration. In fact, the IC chip may include other numbers of linear constant current circuits, which is not specifically limited here.

[0052] IC chip has I 2 The DIM pin connected to the C communication protocol module 2 and the output pin OUT1 connected to the linear constant current circuit 10 are used to connect the LED load.

[0053] I 2 C communication protocol module 2, configured to use the DIM pin to receive external I 2 C communication protocol controller ( Figure 1 Not shown) sent 2 C protocol communication signal, according to I 2 The C protocol communication signal generates a control command for controlling the output current of at least one linear constant current circuit 10 and sends it to the control module 1.

[0054] The control module 1 is configured to generate a corresponding control signal according to the control command, and use the control signal to control the output current of at least one linear constant current circuit 10, thereby controlling the LED load current connected to the corresponding output pin OUT1 through at least one linear constant current circuit 10.

[0055] In the embodiment of the present invention, the control modules 1 and 1 2 The C communication protocol module 2 and the linear constant current circuit 10 are integrated on one IC chip, which not only reduces the peripheral components of the driver, saves the component cost and the production cost of the lamp, but also can be controlled by the external I 2 The C communication protocol controller more conveniently controls the LED load connected to the output pin OUT1 of the IC chip.

[0056] See also Figure 1 In one embodiment of the present invention, the linear constant current circuit 10 further includes a constant current driver module 11 connected to the control module 1. For the linear constant current circuit 10, the control module 1 controls the reference voltage Vref1 of the constant current driver module 11 within the linear constant current circuit 10 using a control signal, thereby controlling the output current of the linear constant current circuit 10 and the corresponding LED load current. For example, if the control module 1 decreases the reference voltage Vref1 of the constant current driver module 11 within the linear constant current circuit 10, the output current of the linear constant current circuit 10 and the corresponding LED load current both decrease.

[0057] Continue to see Figure 1 In one embodiment of the present invention, the linear constant current circuit 10 further includes an output voltage sampling module 12 and active components connected thereto (such as Figure 1 MOS1 in).

[0058] The output voltage sampling module 12 is also connected to the control module 1, and the active components are also connected to the constant current driver module 11. For the linear constant current circuit 10, the output voltage sampling module 12 is configured to sample the output voltage of the linear constant current circuit 10 and provide the sampled output voltage to the control module 1. If the lowest output voltage value of the output voltage provided to the control module 1 by the output voltage sampling module 12 within a preset period is less than a set value, the control module 1 controls the reference voltage Vref1 of the constant current driver module 11 in the linear constant current circuit 10 to decrease. Furthermore, the constant current driver module 11 controls the active components to enter an amplified state, and the output current of the linear constant current circuit 10 decreases until the sampled lowest output voltage value of the linear constant current circuit 10 is greater than the set value.

[0059] This embodiment can quickly adjust the output current of the linear constant current circuit 10 to achieve a ripple-free output current, preventing flicker in the lamp where the circuit is located and providing overcurrent protection for the circuit. When the grid voltage is low, although the output current of the linear constant current circuit 10 decreases and the luminous flux of the lamp decreases, the lamp will not flicker.

[0060] The preset period in this embodiment may be any period, for example, the preset period is T=1 / 50 Hz, T=1 / 100 Hz, etc., and the embodiment of the present invention does not make any specific limitation on this.

[0061] In another embodiment of the present invention, after the output voltage sampling module 12 provides the sampled output voltage of the linear constant current circuit 10 to the control module 1, if the output voltage provided to the control module 1 is greater than a first preset voltage value, the control module 1 controls the reference voltage Vref1 of the constant current driving module 11 in the linear constant current circuit 10 to be reduced to a specified voltage value, and the constant current driving module 11 controls the active element to operate in a cut-off state, the output voltage of the linear constant current circuit 10 increases, and the LED load voltage decreases, thereby achieving OVP (over voltage protection) protection.

[0062] See also Figure 1 and Figure 2a In one embodiment of the present invention, the output voltage sampling module 12 may include: Figure 2a The comparator U, the first voltage-dividing resistor R1', and the second voltage-dividing resistor R2' are shown. One end of the first voltage-dividing resistor R1' is connected to the second voltage-dividing resistor R2', and the other end is connected to the active element (such as Figure 1 The other end of the second voltage-dividing resistor R2 is grounded.

[0063] The comparator U has a positive input terminal (+), a negative input terminal (-), and an output terminal Vo. The positive input terminal is connected between the first voltage divider resistor R1 ′ and the second voltage divider resistor R2 ′, the negative input terminal receives the reference voltage Vref3 , and the output terminal Vo is connected to the control module 1 .

[0064] In this embodiment, the comparator U can be configured to sample the voltage obtained by dividing the output voltage of the linear constant current circuit 10 on the second voltage-dividing resistor R2' (i.e., the voltage at the Vout point), and compare the sampled voltage value with the reference voltage Vref3. If the comparison shows that the sampled voltage value is less than the reference voltage Vref3, the output terminal Vo outputs a low-level signal to the control module 1. After receiving the low-level signal, the control module 1 controls the reference voltage Vref1 of the constant current driving module 11 to decrease, thereby reducing the output current of the linear constant current circuit 10.

[0065] In addition, if the comparator U determines that the sampled voltage value is greater than the reference voltage Vref3 , the output terminal Vo outputs a high-level signal to the control module 1 , and the amplitude of the high-level signal is VCC.

[0066] See also Figure 2b In one embodiment of the present invention, relative to Figure 2a In the connection mode of the comparator U, the comparator U can also reverse the positive input and negative input terminals. Specifically, the negative input terminal of the comparator U is connected between the first voltage divider resistor R1' and the second voltage divider resistor R2', the positive input terminal receives the reference voltage Vref3, and the output terminal Vo is connected to the control module 1.

[0067] In this embodiment, the comparator U can also be configured to sample the output voltage of the linear constant current circuit 10, the voltage obtained by dividing it on the second voltage-dividing resistor R2', and compare the sampled voltage value with the reference voltage Vref3. If the comparison shows that the sampled voltage value is less than the reference voltage Vref3, the output terminal Vo outputs a high level to the control module 1, and the control module 1 controls the reference voltage Vref1 of the constant current driving module 11 to decrease, thereby reducing the output current of the linear constant current circuit 10.

[0068] In an embodiment of the present invention, the output terminal OUT1 of the linear constant current circuit 10 can also be directly connected to the positive input terminal of the comparator U, that is, the first voltage-dividing resistor R1' is omitted. In this case, the voltage drop across the second voltage-dividing resistor R2' is the output voltage of the output pin OUT1 of the linear constant current circuit 10. In addition, in an embodiment of the present invention, the output voltage sampling module 12 can also use other circuits such as an operational amplifier to implement voltage sampling, which is not specifically limited in the embodiment of the present invention.

[0069] Continue to see Figure 1In one embodiment of the present invention, the linear constant current circuit 10 further includes an output current sampling module 13. The IC chip has at least one enable pin, and one enable pin is connected to one output current sampling module. Figure 1 The IC chip includes a linear constant current circuit 10, so the IC chip has an enable pin CS1.

[0070] For the linear constant current circuit 10 , the output current sampling module 13 is connected to the constant current driving module 11 , the control module 1 , the active element (such as MOS 1 ), and the enable pin in the linear constant current circuit 10 , respectively.

[0071] The output current sampling module 13 is configured to sample the voltage value at the enable pin connected to it and provide it to the constant current driving module 11 in the linear constant current circuit 10. The constant current driving module 11 obtains an output signal based on the received voltage value and its reference voltage Vref1. When the output signal is used to control the corresponding active element to be in an amplified state, a constant current is provided to the corresponding LED load.

[0072] In addition, the output current sampling module 13 is further configured to sample the voltage value at the enable pin connected thereto. If the sampled voltage value is greater than a second preset voltage value, the control module 1 is controlled to reduce the reference voltage Vref1 of the corresponding constant current driver module 11. The constant current driver module 11 controls the corresponding active element to operate in the cut-off state, and the output current of the corresponding linear constant current circuit 10 is reduced to zero, thereby achieving OCP (over current protection). In this embodiment, the control module 1 can reduce the reference voltage Vref1 of the constant current driver module 11 to a specific voltage value.

[0073] In one embodiment of the present invention, the active element may include a transistor or a field effect transistor. Figure 1 The active element in the illustrated embodiment is a field effect transistor, the gate of the field effect transistor MOS1 is connected to the constant current driving module 11 in the linear constant current circuit 10, the source is connected to the output current sampling module 13 in the linear constant current circuit 10, and the drain is connected to the output voltage sampling module 12 in the linear constant current circuit 10.

[0074] Continue to see Figure 1 The IC chip also includes an over-temperature protection circuit 3, which is connected to the control module 1 and is configured to detect the temperature of the IC chip.

[0075] If the over-temperature protection circuit 3 detects that the temperature of the IC chip is higher than the preset temperature range, the control module 1 reduces the reference voltage Vref1 of the constant current driving module 11 in at least one linear constant current circuit 10, and the output current of at least one linear constant current circuit 10 is reduced until the temperature of the IC chip is within the preset temperature range.

[0076] If the over-temperature protection circuit 3 detects that the temperature of the IC chip is lower than the preset temperature range, the control module 1 increases the reference voltage Vref1 of the constant current driving module 11 in at least one linear constant current circuit 10, and the output current of at least one linear constant current circuit 10 increases until the output current of the linear constant current circuit 10 increases to a preset maximum current, so that the temperature of the IC chip is within the preset temperature range.

[0077] Figure 3 The IC chip is shown to include two linear constant current circuits (i.e., linear constant current circuit 10 and linear constant current circuit 20). Accordingly, the IC chip also includes two output pins (i.e., output pin OUT1 and output pin OUT2) and two enable pins (i.e., enable pin CS1 and enable pin CS2). The output voltage sampling module 12 included in the linear constant current circuit 10 is connected to the output pin OUT1, and the output current sampling module 13 included therein is connected to the enable pin CS1. The output voltage sampling module 22 included in the linear constant current circuit 20 is connected to the output pin OUT2, and the output current sampling module 23 included therein is connected to the enable pin CS2. Furthermore, the constant current driving module 11, output voltage sampling module 12, and output current sampling module 13 of the linear constant current circuit 10 are respectively connected to the control module 1. The constant current driving module 21, output voltage sampling module 22, and output current sampling module 23 of the linear constant current circuit 20 are also respectively connected to the control module 1. In this embodiment, the operating process of each module in each of the two linear constant current circuits can be referred to in the above embodiment and will not be repeated here.

[0078] In this embodiment, the IC chip can be based on the external I 2 C communication protocol controller ( Figure 3 Not shown) sent 2 C protocol communication signal to control the output current of each linear constant current circuit, and then control the current flowing through the LED load. 2 C communication protocol module 2 is based on I 2The control command generated by the C protocol communication signal is to control the linear constant current circuit 10 to output the maximum current and the linear constant current circuit 20 to not output the current. Then, after the control module 1 generates the corresponding control signal according to the control command, it uses the control signal to control the output pin OUT1 of the linear constant current circuit 10 to output the maximum current (the corresponding LED load can be brightened) and the output pin OUT2 of the linear constant current circuit 20 to not output the current (the corresponding LED load does not emit light). Of course, according to different I 2 C protocol communication signal, the IC chip can also control the output current of each linear constant current circuit to other states, such as reducing the output current of any linear constant current circuit, etc., which is not specifically limited here.

[0079] In this embodiment, when the over-temperature protection circuit 3 is working, the control module 1 can reduce the reference voltage of each constant current driving module according to a predetermined rule in the process of reducing the reference voltage of the constant current driving module in at least two linear constant current circuits. For example, when the control module 1 reduces the reference voltage Vref1 of the constant current driving module 11 in the linear constant current circuit 10 and the reference voltage Vref2 of the constant current driving module 21 in the linear constant current circuit 20, Vref1 and Vref2 can be reduced in equal proportion.

[0080] In addition, the control module 1 can increase Vref1 and Vref2 in equal proportion when increasing the reference voltage Vref1 of the constant current driving module 11 in the linear constant current circuit 10 and the reference voltage Vref2 of the constant current driving module 21 in the linear constant current circuit 20 .

[0081] Continue to see Figure 1 2 , in one embodiment of the present invention, the IC chip further includes a power pin Vin and an internal power circuit 4. The power pin Vin is connected to the internal power circuit 4. The internal power circuit 4 is also connected to the control module 1, thereby directly powering the control module 1 and indirectly powering the constant current drive module 11.

[0082] Based on the same inventive concept, the embodiment of the present invention further provides a driving circuit, see Figure 4 , the driving circuit includes a switch element S, a rectifier module ( Figure 4 Rectifier bridge DB), capacitor element C, at least one sampling resistor, I 2 C communication protocol interface, such as the IC chip in any of the above embodiments, wherein the number of sampling resistors is consistent with the number of linear constant current circuits in the IC chip, Figure 4 In the example shown, two sampling resistors are shown, and the corresponding IC chip includes two linear constant current circuits ( Figure 4(not shown), the two linear constant current circuits are respectively connected to one LED load, wherein the two LED loads can use the same color or different colors.

[0083] In this embodiment, the rectifier module (such as the rectifier bridge DB) is connected to the switch element S and the capacitor element C respectively. In addition, one end of a sampling resistor is connected to an enable pin, and the other end is grounded. For example, Figure 3 and Figure 4 In the embodiment, sampling resistor R3 is connected to enable pin CS1, and sampling resistor R4 is connected to enable pin CS2. Sampling resistor R3 is configured to convert the output current of linear constant current circuit 10 into a voltage value and provide it to output current sampling module 13. Sampling resistor R4 is configured to convert the output current of linear constant current circuit 20 into a voltage value and provide it to output current sampling module 23.

[0084] I 2 C communication protocol interface, connected to the DIM pin and ground pin GND of the IC chip respectively, configured to receive external I 2 C communication protocol controller sends I 2 C protocol communication signal, and the received I 2 C protocol communication signal is sent to the IC chip 2 C communication protocol module 2.

[0085] In another embodiment of the present invention, at least one sampling resistor may be disposed inside the IC chip to convert the output current of the linear constant current circuit into a voltage value and provide the voltage value to the output current sampling module for sampling.

[0086] Continue to see Figure 4 In another embodiment of the present invention, the drive circuit further includes a capacitor C2, one end of which is connected to the power supply pin VCC and the other end is grounded. The capacity of capacitor C2 is primarily determined by determining how long the IC chip can maintain operation after the switch element S is disconnected from the power grid.

[0087] The embodiment of the present invention also provides a lighting control system, Figure 1 、 Figure 3 、 Figure 4 See on the basis of Figure 5 , lighting control system includes: I 2 C communication protocol controller 30 and a plurality of lamps connected thereto and provided with a driving circuit as in any of the above embodiments (such as Figure 5 Lamp 1, lamp 2 ... lamp n), wherein the driving circuit of each lamp includes I 2 C communication protocol module 2 (such as Figure 1 As shown) is pre-configured with a unique I 2C protocol communication address code.

[0088] Any lamp can be configured to drive the I 2 C communication protocol module 2 to I 2 C communication protocol controller 30 sends the pre-configured I 2 C protocol communication address code. 2 C protocol communication address code tells I 2 C communication protocol controller 30.

[0089] I 2 C communication protocol controller 30, configured to receive I 2 C protocol communication address code and store it. In addition, it can also receive the control instructions issued by the user and generate I 2 C protocol communication signal, I 2 C protocol communication signals are sent to the corresponding I 2 The control command sent by the user will carry the information of the lamp to be controlled. 2 The C communication protocol controller 30 analyzes this information to determine the I corresponding to the lamp to be controlled. 2 C protocol communication address code, and then I 2 C protocol communication signal is sent to the determined I 2 C protocol communication address code corresponding to the lamp.

[0090] Any lamp including LED load ( Figure 5 (not shown), the LED load is connected to the output pins (such as output pins OUT1 and OUT2) of the IC chip in the lamp. Each lamp can use the received IC 2 The C protocol communication signal controls the current of its own LED load, thereby achieving dimming and color adjustment of the lamp.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that within the spirit and principles of the present invention, they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate from the scope of protection of the present invention.

Claims

1. An IC chip, characterized in that: It includes a control module, and an I connected to the control module respectively. 2 C communication protocol module, at least one linear constant current circuit, wherein, The IC chip has 2 A DIM pin connected to a C communication protocol module, an output pin connected to the linear constant current circuit, and the output pin is used to connect an LED load; I 2 C communication protocol module, configured to utilize the DIM pin to receive an external I 2 C communication protocol controller sends I 2 C protocol communication signal, according to the I 2 C protocol communication signal generates a control command for controlling the output current of at least one linear constant current circuit, and sends it to the control module; The control module is configured to generate a corresponding control signal according to the control command, and use the control signal to control the output current of the at least one linear constant current circuit, thereby controlling the LED load current connected to the corresponding output pin through the at least one linear constant current circuit; The linear constant current circuit comprises a constant current driving module connected to the control module, For a linear constant current circuit, the control module uses a control signal to control the reference voltage of the constant current driving module in the linear constant current circuit, thereby controlling the output current of the linear constant current circuit and the corresponding LED load current; Wherein, if the reference voltage of the constant current driving module decreases, the output current of the linear constant current circuit and the corresponding LED load current both decrease; The linear constant current circuit also includes an output voltage sampling module and active components connected thereto, wherein: The output voltage sampling module is also connected to the control module, and the active element is also connected to the constant current driving module; For a linear constant current circuit, the output voltage sampling module is configured to sample the output voltage of the linear constant current circuit and provide the sampled output voltage to the control module, wherein, if the lowest output voltage value of the output voltage provided by the output voltage sampling module to the control module within a preset period is less than a set value, the control module controls the reference voltage of the constant current driving module in the linear constant current circuit to decrease, the constant current driving module controls the active element to be in an amplification state, and the output current of the linear constant current circuit decreases until the sampled lowest output voltage value of the linear constant current circuit is greater than the set value, so as to quickly adjust the output current of the linear constant current circuit.

2. The IC chip according to claim 1, characterized in that: For a linear constant current circuit, the output voltage sampling module is further configured to provide the sampled output voltage of the linear constant current circuit to the control module. If the output voltage provided to the control module is greater than a first preset voltage value, the control module controls the reference voltage of the constant current driving module in the linear constant current circuit to decrease, and the constant current driving module controls the active element to operate in a cut-off state, the output voltage of the linear constant current circuit increases, and the LED load voltage decreases.

3. The IC chip according to claim 1 or 2, characterized in that: The linear constant current circuit includes an output current sampling module, the IC chip has at least one enable pin, and one enable pin is connected to one output current sampling module; For a linear constant current circuit, the output current sampling module is connected to the constant current driving module, the control module, the active element, and the enable pin in the linear constant current circuit respectively; The output current sampling module is configured to sample the voltage value at the enable pin connected thereto and provide it to the constant current driving module in the linear constant current circuit, and the constant current driving module obtains an output signal based on the received voltage value and its reference voltage calculation, and uses the output signal to control the corresponding active element to be in an amplified state, thereby providing a constant current to the corresponding LED load; The output current sampling module is also configured to sample the voltage value at the enable pin connected to it. If the sampled voltage value is greater than the second preset voltage value, the control module is controlled to reduce the reference voltage of the corresponding constant current driving module. The constant current driving module controls the corresponding active element to operate in a cut-off state, and the output current of the corresponding linear constant current circuit is reduced to zero.

4. The IC chip according to claim 1, characterized in that: Also includes: an over-temperature protection circuit, connected to the control module and configured to detect the temperature of the IC chip; If the over-temperature protection circuit detects that the temperature of the IC chip is higher than a preset temperature range, the control module is controlled to reduce the reference voltage of the constant current driving module in the at least one linear constant current circuit, and the output current of the at least one linear constant current circuit is reduced until the temperature of the IC chip is within the preset temperature range; If the over-temperature protection circuit detects that the temperature of the IC chip is lower than the preset temperature range, the control module is controlled to increase the reference voltage of the constant current driving module in the at least one linear constant current circuit, and the output current of the at least one linear constant current circuit increases until the output current of the linear constant current circuit increases to a preset maximum current, so that the temperature of the IC chip is within the preset temperature range.

5. The IC chip according to claim 3, characterized in that: The active element includes a triode or a field effect transistor; Among them, if the active element adopts a field effect transistor, the gate of the field effect transistor is connected to the constant current driving module in the linear constant current circuit where it is located, the source is connected to the output current sampling module in the linear constant current circuit where it is located, and the drain is connected to the output voltage sampling module in the linear constant current circuit where it is located.

6. The IC chip according to claim 1, wherein: The IC chip also includes a power pin Vin, a power supply pin VCC and an internal power circuit. The power pin Vin is connected to the internal power circuit; The internal power supply circuit is connected to the power supply pin VCC and the control module, and is configured to supply power to the control module.

7. The IC chip according to claim 3, characterized in that: The IC chip includes two linear constant current circuits, two output pins, and two enable pins, wherein: An output voltage sampling module included in a linear constant current circuit is connected to an output pin, and an output current sampling module included in the linear constant current circuit is connected to an enable pin; Another linear constant current circuit includes an output voltage sampling module connected to another output pin, and an output current sampling module connected to another enable pin; The constant current driving modules, the output voltage sampling modules and the output current sampling modules of the two linear constant current circuits are also connected to the control module respectively.

8. A driving circuit, comprising: Switching element, rectifier module, capacitor element C, at least one sampling resistor, I 2 C communication protocol interface, an IC chip as claimed in any one of claims 1 to 7, wherein: The rectifier module is connected to the switch element and the capacitor element C respectively; One end of a sampling resistor is connected to an enable pin, and the other end is grounded, and the sampling resistor is configured to convert the output current of the linear constant current circuit into a voltage value and provide it to the output current sampling module; I 2 C communication protocol interface, connected to the DIM pin and the ground pin of the IC chip respectively, and configured to receive external I 2 C communication protocol controller sends I 2 C protocol communication signal, and the received I 2 C protocol communication signal is sent to the I 2 C communication protocol module.

9. The driving circuit according to claim 8, characterized in that: Also includes a capacitive element C2, The capacitor element C2 has one end connected to the power supply pin VCC and the other end grounded.

10. A lighting control system, comprising: I 2 C communication protocol controller and a plurality of lamps connected thereto and provided with the driving circuit according to claim 8 or 9, wherein the driving circuit of each lamp comprises I 2 C communication protocol module is pre-configured with a unique I 2 C protocol communication address code; The lamp is configured to drive the I 2 C communication protocol module to the I 2 C communication protocol controller sends a pre-configured I 2 C protocol communication address code; I 2 C communication protocol controller, configured to receive I 2 C protocol communication address code and store it, and receive the control instruction issued by the user, generate I 2 C protocol communication signal, I 2 C protocol communication signals are sent to the corresponding I 2 In the lamp corresponding to the C protocol communication address code; Any of the lamps includes an LED load, the LED load is connected to an output pin of an IC chip in the lamp, and the lamp is further configured to utilize the received I 2 C protocol communication signal controls the current of its own LED load.

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