Dimming circuit for a lighting assembly and lighting assembly

Abstract

The application provides a dimming circuit for a lighting assembly and the lighting assembly, the lighting assembly comprising a light source and a control chip for generating a pulse width modulation (PWM) signal, the dimming circuit comprising a transformer comprising a primary side and a secondary side, the primary side being connected to the control chip and the secondary side being connected to a dimmer, the transformer being capable of delivering an output dimming signal to the control chip based on a 0-10V signal at the dimmer, thereby controlling the light source.

Description

Technical Field

[0001] This invention relates to a lighting device, and more particularly to a dimming circuit for a lighting assembly, as well as the lighting assembly itself. Background Technology

[0002] Light sources have received widespread attention and application due to their advantages such as small size, high brightness, low power consumption and long lifespan.

[0003] Most light sources nowadays have dimming functions. According to safety regulations, dimming circuits must be powered independently; otherwise, there will be safety hazards. Summary of the Invention

[0004] The dimming circuit for the lighting component provided by this invention offers a separate power supply mode that is safe and reliable. Furthermore, it controls the transformer via a PWM signal to switch between energy storage and release states, supplying a preset current to the light source based on the transformer's turns ratio, thereby achieving dimming of the light source. By incorporating a transformer into the dimming circuit, the circuit can further power the dimmer, saving on some power supply components and optocouplers used for isolation transmission, resulting in significant cost advantages.

[0005] This invention provides a dimming circuit for a lighting component, the lighting component including a light source and a control chip, the control chip being used to generate a pulse width modulation (PWM) signal, the dimming circuit including a transformer having a primary side and a secondary side, the primary side being connected to the control chip, the secondary side being connected to a dimmer, the transformer being able to output a dimming signal based on the PWM signal to control the light source.

[0006] The present invention also provides a lighting assembly comprising the dimming circuit described above.

[0007] Other features and aspects will become clear from the following detailed description, accompanying drawings, and claims. Attached Figure Description

[0008] The invention can be better understood by describing exemplary embodiments of the invention in conjunction with the accompanying drawings, in which:

[0009] Figure 1 These are schematic diagrams of lighting components according to some embodiments of the present invention; and

[0010] Figure 2 This is a schematic diagram of a lighting assembly according to other embodiments of the present invention. Detailed Implementation

[0011] The following describes specific embodiments of the present invention. It should be noted that, in order to provide a concise description, this specification cannot exhaustively describe all features of the actual embodiments. It should be understood that, in the actual implementation of any embodiment, just as in any engineering or design project, various specific decisions are often made to achieve the developer's specific goals and to meet system-related or business-related constraints, and this can change from one embodiment to another. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, some design, manufacturing, or production modifications based on the technical content disclosed herein are merely conventional technical means and should not be construed as insufficient content of this disclosure.

[0012] The terms "first," "second," and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0013] The lighting components of this application include, but are not limited to, light-emitting diode (LED) lamps, organic light-emitting diode (OLED) lamps, fluorescent lamps, and high-intensity discharge (HID) lamps. The following detailed description will use LED lamps as an example.

[0014] Figure 1 Schematic diagrams of lighting components according to some embodiments of the present invention are shown. For example... Figure 1 As shown, the lighting assembly 100 includes a light source 110 and a control chip 130, which generates a pulse width modulation (PWM) signal. Specifically, pulse width modulation is an analog control method.

[0015] The lighting assembly 100 further includes a dimmer 140. A dimmer is an electrical device that changes the luminous flux of a light source and adjusts the illuminance level. It can achieve dimming by changing the current value of the light source. The preset voltage amplitude of the dimmer is from 0V to 10V. The preset voltage amplitude of the dimmer corresponds to different light source brightness. For example, 10V can be set to represent the brightest and 0V to represent the dimmest. Of course, 10V can also be set to the dimmest and 0V to the brightest.

[0016] In some embodiments, the lighting assembly 100 further includes a dimming circuit 150, which includes a transformer 151. The transformer 151 includes a primary side 166 and a secondary side 167. The primary side 166 of the transformer is connected to the control chip 130, and the secondary side 167 is connected to the dimmer 140. The transformer 151 is capable of outputting a dimming signal based on a pulse signal to control the light source 110. Specifically, the dimming signal includes a voltage value or a current value.

[0017] In some embodiments, the control chip is specifically an IC chip, i.e., a microelectronic device. Of course, any suitable control chip can be used. The control chip 130 has at least one control port. Preferably, the control chip 130 includes a first port and a second port. The first port is used to input or output a PWM signal, and the second port is used to receive a dimming signal. The control chip 130 can control the light source 110 based on the dimming signal. Specifically, the first port of the control chip 130 is a PWM terminal, and the second port is a DIM terminal. The PWM terminal can generate a PWM signal and transmit it to the dimming circuit to generate a dimming signal. On the other hand, the PWM terminal can also generate a dimmed PWM signal (e.g., changing the amplitude and / or duty cycle, etc.) based on the dimming signal received at the DIM terminal and provide it to the light source to achieve the dimming function. The DIM terminal can receive the dimming signal from the dimming circuit.

[0018] Those skilled in the art should note that when the DIM terminal receives a dimming signal, the control chip controls the light source in ways not limited to adjusting the PWM signal as described above, but may include any other suitable methods.

[0019] even though Figure 1 The diagram only shows a control chip with two ports; however, those skilled in the art should understand that a control chip can include any number of ports, and these ports can include different functions.

[0020] In some embodiments, the lighting assembly further includes a main control circuit 120, which is disposed between the light source 110 and the control chip 130. The main control circuit 120 is capable of controlling the light source 110 based on signals from the control chip 130, for example, turning it on or off. Specifically, the main control circuit 120 includes a rectifier unit (not shown in the figure), which includes a rectifier bridge for converting alternating current (AC) to direct current (DC) to supply the light source. The main control circuit may also include interference suppression circuitry to limit EMI signals. Furthermore, the main control circuit may include detection circuitry to detect whether the two ends of the light source are properly installed or whether a power supply is connected, etc. Those skilled in the art should understand that the main control circuit is not limited to the circuits described above, and may include any other circuit capable of controlling the light source.

[0021] The lighting assembly 100 further includes a first switch 170, the input terminal of which is connected to the control chip 130. The dimming circuit 150 further includes a first diode D1, which is connected between the output terminal of the first switch 170 and the first end of the primary side of the transformer 151.

[0022] Specifically, the first switch 170 can be, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), a bipolar junction transistor (BJT), a silicon controlled rectifier (SCR), a relay, etc., or it can be an LED control device such as a switching power supply or a linear power supply. Specifically, the first switch can be constructed using any one or a combination of materials, including but not limited to silicon carbide.

[0023] Specifically, taking a MOSFET as an example, the first switch 170 includes three terminals: a gate (g), a drain (d), and a source (s). In this application, the gate (g) is defined as the first terminal of the first switch, the drain (d) is defined as the second terminal of the first switch, and the source (s) is defined as the third terminal of the first switch. In this application, the first terminal of the first switch 170 is connected to the control chip 130, and the first terminal is the input terminal, while the second terminal is the output terminal. Specifically, the first terminal is connected to the PWM terminal of the control chip 130, the second terminal of the first switch 170 is connected to the first terminal of the primary side of the transformer through the first diode D1, and the third terminal of the first switch 170 is grounded.

[0024] The PWM terminal of the control chip 130 can output a first set of PWM signals, which includes a first PWM signal and a second PWM signal. The first PWM signal and the second PWM signal are set alternately and repeatedly, and the ratio of the first PWM signal to the second PWM signal is the duty cycle. For the first set of PWM signals, the duty cycle is fixed.

[0025] Specifically, when the PWM terminal of the control chip 130 outputs the first set of PWM signals, for the first PWM signal, the voltage at the first terminal of the first switch 170 is greater than the voltage at the second terminal, so the first switch 170 is turned on. For the second PWM signal, the voltage at the first terminal of the first switch 170 is not greater than the voltage at the second terminal, so the first switch 170 is turned off. Therefore, when the PWM terminal of the control chip 130 outputs the first set of PWM signals, the first switch repeatedly switches between on and off. The switching time depends on the duty cycle of the PWM signal, and the PWM signal can control the on or off state of the first switch 170.

[0026] The dimming circuit 150 further includes a DC power supply Vcc, which is connected to the second terminal of the primary side of the transformer 151. Specifically, the DC power supply Vcc can be used to charge the transformer.

[0027] The dimming circuit 150 further includes a second diode D2 and a first capacitor C1 disposed on the primary side 166. The second diode D2 is connected between the positive terminal of the first diode D1 and the control chip 130, and the first capacitor C1 is connected between the negative terminal of the second diode D2 and ground.

[0028] Specifically, the positive terminal of the second diode D2 is connected to the first end of the primary side of the transformer, that is, the positive terminal of the first diode D1, and the negative terminal of the second diode D2 is connected to the first capacitor C1. The second port DIM terminal of the control chip 130 is connected between the second diode D2 and the first capacitor C1.

[0029] Specifically, the dimming circuit further includes a third diode D3 and a second capacitor C2 disposed on the secondary side. The positive terminal of the third diode D3 is connected to the first terminal of the secondary side of the transformer, and the dimmer and the second capacitor C2 are connected in parallel across the two ends of the secondary side.

[0030] In some embodiments, the transformer can store energy based on a first PWM signal output by the control chip 130, and the transformer can release energy based on a second PWM signal output by the control chip 130, while simultaneously outputting the dimming signal.

[0031] Specifically, when the PWM terminal of the control chip 130 outputs the first set of PWM signals, during the first PWM signal period, the first switch 170 is turned on, the first diode D1 is turned on, and the DC power supply Vcc can charge the transformer 151, that is, the transformer is in an energy storage state. At this time, there is no output on the secondary side, that is, no current or voltage is supplied to the dimmer. During the second PWM signal period, the first switch 170 is turned off, the first diode D1 is turned off, and the transformer 151 discharges, that is, releases energy. At this time, there is an output on the secondary side. Since the load of the dimmer is fixed, and the dimmer is adjusted or selected to a preset brightness, it corresponds to a preset voltage value. Therefore, the secondary side has a fixed voltage and a fixed load, thus generating a fixed current value. Through the turns ratio of the transformer, the current on the secondary side is also mapped to the primary side. Therefore, a fixed current is also generated in the primary side. The current is the dimming signal, which is provided to the control chip to control the light source.

[0032] In some embodiments, the transformer further supplies power to the dimmer when outputting the dimming signal. During the second PWM signal, the transformer releases energy, at which point it can provide voltage to the dimmer, thereby supplying power to the dimmer. Therefore, the dimming circuit in this application can achieve stable and safe dimming through the transformer, and can also supply power to the dimmer.

[0033] In some embodiments, the dimming signal can be determined based on the turns ratio of the transformer. Specifically, the turns ratio refers to the proportional relationship between the primary and secondary windings of the transformer. In a non-limiting embodiment, the turns ratio of the transformer can be 1:1, that is, the primary winding and the secondary winding are equal. Of course, the turns ratio can be any suitable proportional relationship.

[0034] Specifically, for example, the dimmer is adjusted to a preset brightness value. The voltage value corresponding to this brightness is 5V. Assuming the load of the dimmer is 5 ohms, the current on the secondary side is 1A. Assuming the turns ratio of the transformer is 1:1, the current mapped from the secondary side to the primary side is 1A. This current on the primary side is provided to the control chip as a dimming signal, and the control chip can control the brightness of the light source accordingly.

[0035] Figure 2 Schematic diagrams of lighting components according to other embodiments of the present invention are shown. For ease of illustration, Figure 2 The light source is not shown; however, those skilled in the art will understand that the main control circuit 120 is also connected to the light source. Figure 2 As shown, the lighting assembly 200 also includes a control chip 130, a dimmer 140, and a dimming circuit 150. The control chip includes a first port PWM terminal and a second port DIM terminal.

[0036] The dimming circuit 150 includes a transformer 151, which includes a primary side 166 and a secondary side 167. The primary side 166 of the transformer is connected to the control chip 130, and the secondary side 167 is connected to the dimmer 140. The transformer 151 can output a dimming signal based on a pulse signal to control the light source 110.

[0037] and Figure 1 Unlike the lighting assembly 100 shown, the lighting assembly 200 further includes a pulse unit 280, which is connected to the dimming circuit 150 to provide a stable PWM signal to the dimming circuit 150. Furthermore, the lighting assembly 200 does not include a first diode.

[0038] Specifically, the lighting assembly 200 further includes a first switch 170, the first port (input terminal) of which is connected to the control chip 130, specifically to the PWM port of the control chip; the second port is connected to the main control circuit 120; and the third port is grounded. Figure 2 In the embodiment shown, the PWM signal generated by the PWM port of the control chip is no longer transmitted to the dimming circuit.

[0039] The dimming circuit 150 further includes a second diode D2 and a first capacitor C1 disposed on the primary side. The second diode D2 and the first capacitor C1 are connected in series. The second diode D2 is connected to the first end of the primary side of the transformer. The second end of the primary side of the transformer is connected to a DC power supply Vcc.

[0040] The secondary side of the transformer is equipped with a third diode D3 and a second capacitor C2. The positive terminal of the third diode D3 is connected to the first terminal of the secondary side of the transformer. The dimmer and the second capacitor C2 are connected in parallel across the two terminals of the secondary side.

[0041] Specifically, the output terminal of the pulse unit 280 is connected to the positive terminal of the second diode D2, that is, connected to the first terminal of the primary side of the transformer. The pulse unit can generate a stable PWM signal to be transmitted to the dimming circuit.

[0042] Specifically, the pulse unit includes a second switch Q2, the output of which is the output of pulse unit 280. The pulse unit further includes four resistors R1, R2, R3, and R4 connected in parallel, a third capacitor C3 connected between resistors R1 and R2, and a fourth capacitor C4 connected between resistors R3 and R4. Furthermore, the pulse unit also includes another DC power supply to power the four resistors.

[0043] Specifically, the pulse unit further includes a third switch Q3 and a fourth switch Q4. The first terminal (input terminal) of the third switch Q3 is connected to resistor R3 and the second terminal is connected to resistor R1. The first terminal (input terminal) of the fourth switch Q4 is connected to resistor R2 and the second terminal is connected to resistor R4. The third terminals of the third switch Q3 and the fourth switch Q4 are respectively connected to the third terminal of the second switch.

[0044] In a non-limiting embodiment, the second switch is a MOSFET, and the third and fourth switches are transistors. Specifically, the first terminal of the third switch is the base, the second terminal is the collector, and the third terminal is the emitter; similarly, the first terminal of the fourth switch is the base, the second terminal is the collector, and the third terminal is the emitter. The first terminal of the second switch is the gate, the second terminal is the drain, and the third terminal is the source. Specifically, the base of the third switch is connected to resistor R3, and the collector is connected to resistor R1; the base of the fourth switch is connected to resistor R2, and the collector is connected to resistor R4; the emitters of the third and fourth switches are respectively connected to the sources of the second switches; the gate of the second switch is connected to the fourth resistor; and the drain of the second switch is the output terminal of the pulse circuit, connected to the first terminal of the primary winding of the transformer.

[0045] Specifically, by configuring the four resistors with different resistance values, the capacitors connected between each pair of resistors can be charged in turn, thereby causing the third and fourth switches to be turned on in turn. This allows the second switch to be turned on for a period of time, outputting a voltage value, and then turned off for a period of time, with no output. This on-off operation is repeated continuously, thus outputting a stable and controllable PWM signal. The duty cycle of this stable PWM signal can be changed by setting the resistance values.

[0046] although Figure 2 A pulse circuit is shown; however, those skilled in the art should understand that pulse circuits are not limited to the one described above, and may include any other suitable circuit forms. Furthermore, although... Figure 2 Two types of switching modules are used, but the same type of switching module or other combinations can also be used. For example, the second switch uses a transistor, and the third and fourth switches use MOSFETs, or all of them use MOSFETs, or other switching forms are used, etc.

[0047] The circuit diagrams shown in this invention include only some necessary circuits and components. Those skilled in the art should understand that actual dimming circuits and / or main control circuits and / or lighting components also include other components and / or circuits, such as rectifier circuits, anti-interference circuits, etc. Those skilled in the art should understand that the focus of this invention is on the dimming circuit; the main control circuit can be controlled in any existing manner without affecting the dimming circuit in this invention.

[0048] In some embodiments, this application may include multiple light sources and multiple dimming circuits to provide different dimming signals to different light sources, thereby achieving different dimming requirements. In some embodiments, the dimming circuits in this application may also be used to provide brightness adjustment for light sources of different colors, such as white or yellow lights. Specifically, dimming in this application may be adjusting brightness or adjusting color temperature.

[0049] The dimming circuit in the lighting assembly of some embodiments of the present invention, by employing a separate power supply circuit, is safe, reliable, and low-cost. Furthermore, by using a PWM signal to control the charging and discharging of the transformer, based on the transformer's turns ratio, a fixed current on the secondary side is mapped to the primary side, and this current corresponding to the dimming brightness is provided to the control chip, thereby achieving the purpose of dimming. Simultaneously, it can power the dimmer while dimming, eliminating the need for a separate power supply module for the dimmer. Moreover, by further incorporating a pulse circuit, the stability of the dimming circuit can be further improved.

[0050] Some embodiments of this application propose a dimming circuit for a lighting assembly, the lighting assembly including a light source and a control chip, the control chip being used to generate a pulse width modulation (PWM) signal, the dimming circuit including a transformer having a primary side and a secondary side, the primary side being connected to the control chip, the secondary side being connected to a dimmer, the transformer being able to output a dimming signal based on the PWM signal to control the light source.

[0051] Specifically, the transformer, when outputting the dimming signal, is further used to power the dimmer.

[0052] Specifically, the dimming signal can be determined based on the turns ratio of the transformer.

[0053] Specifically, the transformer can store energy based on the first PWM signal output by the control chip, and the transformer can release energy based on the second PWM signal output by the control chip. When the transformer releases energy, it outputs the dimming signal.

[0054] Specifically, the lighting assembly further includes a main control circuit, which is disposed between the control chip and the light source and is used to control the light source based on the signal from the control chip.

[0055] Specifically, the lighting component further includes a pulse unit connected to the dimming circuit to provide a stable PWM signal to the dimming circuit.

[0056] Specifically, the control chip includes a first port and a second port. The first port is used to input or output the PWM signal, and the second port is used to receive the dimming signal. The control chip can control the light source based on the dimming signal.

[0057] Specifically, the lighting component further includes a first switch, the input terminal of which is connected to the control chip, and the dimming circuit further includes a first diode, which is connected between the output terminal of the first switch and a first terminal of the primary side of the transformer.

[0058] Specifically, the first switch includes a field-effect transistor or a triode, and the first terminal of the first switch is connected to the control chip, the second terminal is connected to the first diode, and the third terminal is grounded.

[0059] Specifically, the dimming circuit further includes a second diode and a first capacitor disposed on the primary side, the second diode being connected between the positive terminal of the first diode and the control chip, and the first capacitor being connected between the negative terminal of the second diode and ground.

[0060] Specifically, the dimming circuit further includes a third diode and a second capacitor disposed on the secondary side, the second capacitor and the dimmer being connected in parallel between the two ends of the secondary side, and the third diode being connected between the first end of the secondary side and the second capacitor.

[0061] Some embodiments of this application also propose a lighting assembly including a light source, a control chip, and a dimming circuit. The control chip is used to generate a pulse width modulation (PWM) signal, and the dimming circuit includes a transformer with a primary side and a secondary side. The primary side is connected to the control chip, and the secondary side is connected to a dimmer. The transformer is capable of outputting a dimming signal based on the PWM signal to control the light source.

[0062] Specifically, the transformer, when outputting the dimming signal, is further used to power the dimmer.

[0063] Specifically, the dimming signal can be determined based on the turns ratio of the transformer.

[0064] Specifically, the transformer can store energy based on the first PWM signal output by the control chip, and the transformer can release energy based on the second PWM signal output by the control chip. When the transformer releases energy, it outputs the dimming signal.

[0065] Specifically, the lighting assembly further includes a main control circuit, which is disposed between the control chip and the light source and is used to control the light source based on the signal from the control chip.

[0066] Specifically, the lighting component further includes a pulse unit connected to the dimming circuit to provide a stable PWM signal to the dimming circuit.

[0067] Specifically, the control chip includes a first port and a second port. The first port is used to input or output the PWM signal, and the second port is used to receive the dimming signal. The control chip can control the light source based on the dimming signal.

[0068] Specifically, the lighting component further includes a first switch, the input terminal of which is connected to the control chip, and the dimming circuit further includes a first diode, which is connected between the output terminal of the first switch and a first terminal of the primary side of the transformer.

[0069] Specifically, the first switch includes a field-effect transistor or a triode, and the first terminal of the first switch is connected to the control chip, the second terminal is connected to the first diode, and the third terminal is grounded.

[0070] Specifically, the dimming circuit further includes a second diode and a first capacitor disposed on the primary side, the second diode being connected between the positive terminal of the first diode and the control chip, and the first capacitor being connected between the negative terminal of the second diode and ground.

[0071] Specifically, the dimming circuit further includes a third diode and a second capacitor disposed on the secondary side, the second capacitor and the dimmer being connected in parallel between the two ends of the secondary side, and the third diode being connected between the first end of the secondary side and the second capacitor.

[0072] Some exemplary embodiments have been described above; however, it should be understood that various modifications can be made. For example, suitable results may be achieved if the described techniques are performed in a different order and / or if components in the described system, architecture, device, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents. Accordingly, other embodiments also fall within the scope of the claims.

Claims

1. A dimming circuit for a lighting assembly, characterized in that, The lighting assembly includes a light source and a control chip. The control chip is used to generate a pulse width modulation (PWM) signal based on a dimming signal to control the light source. The dimming circuit includes: The transformer includes a primary side and a secondary side, the primary side being connected to the control chip and the secondary side being connected to a dimmer. The transformer is capable of transmitting an output dimming signal to the control chip based on the PWM signal to control the light source. The lighting assembly further includes a first switch, a first terminal of which is an input terminal, a second terminal of which is an output terminal, and a third terminal of which is grounded. The input terminal of the first switch is connected to the control chip. The dimming circuit further includes a first diode, which is connected between the output terminal of the first switch and a first terminal of the primary winding of the transformer. The positive terminal of the first diode is connected to the first terminal of the primary winding of the transformer, and the negative terminal of the first diode is connected to the output terminal of the first switch. The dimming circuit further includes a second diode and a first capacitor disposed on the primary side. The second diode is connected between the positive terminal of the first diode and the control chip, wherein the positive terminal of the second diode is connected to the positive terminal of the first diode, and the first capacitor is connected between the negative terminal of the second diode and ground. The control chip includes a first port and a second port. The first port is used to input or output the PWM signal, and the second port is used to receive the dimming signal. The control chip can control the light source based on the dimming signal. The first port of the control chip is a PWM terminal, and the second port is a DIM terminal. The second port DIM terminal of the control chip is connected between the second diode and the first capacitor. The first terminal of the first switch is connected to the PWM terminal of the control chip. The PWM terminal can generate a PWM signal and transmit the PWM signal to the dimming circuit to generate a dimming signal. The PWM terminal can also generate a dimmed PWM signal based on the dimming signal received by the DIM terminal. The dimming circuit further includes a third diode and a second capacitor disposed on the secondary side. The second capacitor and the dimmer are connected in parallel between the two ends of the secondary side. The third diode is connected between the first end of the secondary side and the second capacitor. The positive terminal of the third diode is connected to the first end of the secondary side, and the negative terminal of the third diode is electrically connected to the second capacitor.

2. The dimming circuit as described in claim 1, characterized in that, The transformer, while transmitting the dimming signal proportionally based on the transformer's turns ratio, is further used to power the dimmer.

3. The dimming circuit as described in claim 1, characterized in that, The transformer can store energy when it is turned on based on the first PWM signal output by the control chip, and can release energy when it is turned off based on the second PWM signal output by the control chip. When the transformer releases energy, it transmits the dimming signal.

4. The dimming circuit as described in claim 1, characterized in that, The lighting assembly further includes a main control circuit, which is disposed between the control chip and the light source and is used to control the light source based on the signal from the control chip.

5. A lighting assembly, characterized in that, Includes the dimming circuit as described in any one of claims 1-4.

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