Driving power supply and lighting system

Abstract

The invention relates to a driving power supply and a lighting system, and the driving power supply is used for driving a lamp, and comprises an intelligent communication circuit which is used for external communication; the color temperature adjusting circuit is provided with an integrated color matching module; the integrated color adjusting module is in communication connection with the intelligent control circuit and is used for adjusting the color temperature of the lamp according to a color temperature adjusting signal sent by the intelligent control circuit; the power supply circuit is configured to supply power to the intelligent communication circuit in a non-isolation mode and supply power to the integrated color modulation module in an isolation mode; wherein the power supply circuit is further constructed in a way that when the brightness of the lamp is adjusted to be zero, the power supply voltage of the integrated color modulation module drops below a second input voltage range required by normal work of the integrated color modulation module, so that the integrated color modulation module is triggered to be powered down and stop working.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of driving power supply, in particular to a driving power supply and a lighting system. BACKGROUND

[0002] With the improvement of people's living standards, intelligent lighting is becoming more and more important.

[0003] In the prior art, the scheme for realizing the driving of an isolated light-adjustable and color-adjustable lamp is usually complex. For example, some schemes adopt a two-stage control architecture, the front stage is an AC-DC isolated power supply, and the rear stage is an independent intelligent control and DC-CC constant-current light-adjustable and color-adjustable circuit, resulting in high power consumption.

[0004] In view of this, it is urgent to overcome the defects of the prior art in the technical field. SUMMARY

[0005] An object of the present disclosure is to provide a driving power supply and a lighting system, wherein the driving power supply couples the brightness state of the lamp with the energy consumption state of the integrated color control module by using the power supply self-consistency characteristics of the integrated color control module, so as to reduce power consumption.

[0006] Another object of the present disclosure is to provide a driving power supply and a lighting system, wherein the driving power supply eliminates the complexity of providing a high-quality isolated power supply for the intelligent communication circuit through the high-voltage side common bus, reduces the cost, and directly improves the reliability. By means of the low-voltage side common bus, the need for separately providing a power supply circuit for the color control circuit is eliminated, further simplifying the secondary circuit.

[0007] Another object of the present disclosure is to provide a driving power supply and a lighting system, wherein the color temperature adjustment circuit of the driving power supply can always stably and reliably obtain working power directly from its power supply output end during the entire brightness adjustment process of the lamp, without any form of secondary voltage stabilization or independent power supply circuit intervention.

[0008] Another object of the present disclosure is to provide a driving power supply and a lighting system, wherein the integrated color control module on the low-voltage side of the driving power supply is directly powered by the LED lamp string load, and its working state automatically follows the brightness adjustment and changes coordinately, without the need for an independent voltage stabilizing power supply, simplifying the circuit structure and ensuring the independence of color temperature control at any brightness.

[0009] Another object of the present disclosure is to provide a driving power supply and a lighting system, wherein when a short circuit fault occurs in the driving power supply, the entire color temperature adjustment function unit immediately and completely stops working, i.e., enters a "overall power-down" state.

[0010] Another object of this disclosure is to provide a driving power supply and a lighting system, wherein the integrated color control module stops working when the brightness of the luminaire drops to zero (i.e., completely turned off).

[0011] Another objective of this disclosure is to provide a driving power supply and a lighting system, wherein the driving power supply utilizes the imbalance between the static current consumption of the constant current control chip itself and the small charging current provided by the megaohm-level start-up resistor (second voltage divider resistor) to actively trigger and maintain the undervoltage protection state of the constant current control chip, thereby further reducing power consumption in the light-off state.

[0012] To achieve at least one of the above objectives, according to a first aspect of this disclosure, a driving power supply is provided for driving a luminaire, comprising: an intelligent communication circuit for external communication; a color temperature adjustment circuit having an integrated color tuning module; the integrated color tuning module being communicatively connected to the intelligent control circuit for adjusting the color temperature of the luminaire according to a color temperature adjustment signal emitted therefrom; and a power supply circuit configured to supply power to the intelligent communication circuit in a non-isolated manner and to supply power to the integrated color tuning module in an isolated manner; wherein the power supply circuit is further configured such that when the brightness of the luminaire is adjusted to zero, the power supply voltage of the integrated color tuning module drops below a second input voltage range required for its normal operation, thereby triggering the integrated color tuning module to power off and stop working.

[0013] In one embodiment of this disclosure, the power supply circuit includes: a high-voltage side circuit for connecting to AC mains power and rectifying and filtering it to form a high-voltage DC bus, which supplies power to the intelligent communication circuit and a brightness adjustment circuit; the brightness adjustment circuit is communicatively connected to the intelligent communication circuit and is used to adjust the brightness of the lamp; a coupling circuit is connected between the high-voltage side circuit and a low-voltage side circuit for achieving electrical isolation and transmitting energy and color temperature adjustment signals; the low-voltage side circuit receives energy from the high-voltage side circuit through the coupling circuit and forms a low-voltage DC bus, which supplies power to the color temperature adjustment circuit and outputs a power supply output terminal for supplying power to the lamp; wherein the intelligent communication circuit and the brightness adjustment circuit share the high-voltage DC bus, and the color temperature adjustment circuit and the power supply output terminal share the low-voltage DC bus.

[0014] In one embodiment of this disclosure, the color temperature adjustment circuit has a first input voltage operating range; wherein at least a portion of the first input voltage range of the color temperature adjustment circuit covers the first operating voltage range of the lamp, so that the color temperature adjustment circuit can stably obtain operating power directly from the power supply output terminal during the entire brightness adjustment process of the lamp; the first operating voltage range of the lamp is the operating voltage range of the lamp under constant current drive.

[0015] In an embodiment of the present disclosure, the color temperature adjustment circuit comprises an integrated color adjustment control module and a first voltage divider circuit, the integrated color adjustment control module is connected to the low-voltage DC bus via the first voltage divider circuit; the first voltage divider circuit is configured to, in a state where the lamp is turned on, divide the voltage from the low-voltage DC bus in the first working voltage range to a second input voltage range of the integrated color adjustment control module to supply power to it; wherein the second input voltage range is the power supply voltage range in which the integrated color adjustment control module can normally work.

[0016] In an embodiment of the present disclosure, the coupling circuit comprises: an energy coupling path for isolating connecting the high-voltage side circuit and the low-voltage side circuit; a signal coupling path for isolating connecting the intelligent communication circuit and the color temperature adjustment circuit; wherein the energy coupling path and the signal coupling path are cooperatively configured to jointly constitute a complete electrically isolated transmission channel for realizing electrically isolated transmission of power energy and color temperature adjustment signals from the high-voltage side circuit to the low-voltage side circuit.

[0017] In an embodiment of the present disclosure, the brightness adjustment circuit comprises a constant current control module composed of a constant current control chip; the energy coupling path comprises a transformer, the primary winding of which is connected to the constant current control module, and the output of the secondary winding of the transformer forms a stable DC voltage rail after rectification and filtering, which constitutes the low-voltage DC bus for connecting to the color temperature adjustment circuit and the power supply output end to realize isolated transmission of power energy; the intelligent communication circuit is communicatively connected to the PWM pin of the constant current control module to adjust the transformer secondary output current through the constant current control module; the signal coupling path comprises a signal coupler, the input end of which is connected to the intelligent communication circuit and the output end of which is connected to the color temperature adjustment circuit to realize isolated transmission of the color temperature adjustment signal; the signal coupler is realized in at least one of the following ways: optical coupling, magnetic coupling, and capacitive coupling.

[0018] In an embodiment of the present disclosure, the transformer is configured to have a specific turns ratio and winding process, so that in the state where the constant current control module adjusts the transformer secondary output current to the brightness of the lamp to zero, the induced voltage and leakage energy release of the secondary winding are sufficient to reduce the low-voltage DC bus voltage to a predetermined low level; the color temperature adjustment circuit comprises an integrated color adjustment control module and a first voltage divider circuit, the integrated color adjustment control module is connected to the low-voltage DC bus via the first voltage divider circuit; wherein the voltage dividing ratio of the first voltage divider circuit is specially set so that at the predetermined low level, its voltage dividing output value is lower than the minimum value of the second input voltage range of the integrated color adjustment control module, thereby triggering the integrated color adjustment module to power off and stop working; the second input voltage range is the power supply voltage range in which the integrated color adjustment control module can normally work.

[0019] In an embodiment of the present disclosure, the high-voltage side circuit comprises an electromagnetic interference filtering and rectifying circuit and a direct current filtering circuit connected in sequence, an output end of the direct current filtering circuit being connected to a primary winding of the transformer to form a high-voltage direct current bus of the high-voltage side circuit; the intelligent communication circuit comprises a Bluetooth communication module and a high-voltage step-down power supply module; the Bluetooth communication module is powered by the high-voltage step-down power supply module, an input end of the high-voltage step-down power supply module being connected to an output end of the direct current filtering circuit; the brightness adjustment circuit comprises a constant current control module composed of a constant current control chip and a second voltage dividing circuit; the constant current control module is connected to the high-voltage direct current bus via the second voltage dividing circuit; wherein the second voltage dividing circuit has a second voltage dividing resistor with a specific resistance value, so that in a state where the luminaire is lit, the voltage from the high-voltage direct current bus is divided to be within a third input voltage range of the constant current control chip to power it, and in a state where the brightness of the luminaire is adjusted to zero, the constant current control chip can be automatically triggered into an under-voltage protection state in it or repeatedly jump between the under-voltage protection state and a state of attempting to start; wherein the third input voltage range is a power supply voltage range in which the constant current control module can normally work.

[0020] In an embodiment of the present disclosure, the constant current control chip of the constant current control module has a specific static current consumption, the third input voltage range and the resistance value of the second voltage dividing resistor are cooperatively configured, so that in a state where the brightness of the luminaire is adjusted to zero, the constant current control chip can be automatically triggered into an under-voltage protection state in it or repeatedly jump between the under-voltage protection state and a state of attempting to start.

[0021] In an embodiment of the present disclosure, if in a state where the brightness of the luminaire is adjusted to zero, the constant current control chip can be automatically triggered to repeatedly jump between an under-voltage protection state and a state of attempting to start, then the supply port voltage of the constant current control chip presents a triangular waveform.

[0022] To achieve at least one of the above purposes, according to a second aspect of the present disclosure, there is provided a lighting system comprising a driving power supply provided by the first aspect described above, and a luminaire with at least two lamp strings of different color temperatures; the driving power supply is electrically connected to the luminaire to adjust the brightness and color temperature of the luminaire.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. The above invention contents can be combined arbitrarily, and these and other purposes of the present disclosure will be fully embodied through the following detailed description and drawings.

[0024] It should be understood that the general description and detailed description that follow are merely exemplary and explanatory and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the drawings required to be used in the embodiments or the prior art description will be briefly introduced hereinafter. The drawings incorporated into the description and forming a part of the description show the embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0026] Figure 1 is a hardware circuit block diagram schematic of a driving power supply in an embodiment of the present disclosure;

[0027] Figure 2 is a hardware circuit block diagram schematic of a driving power supply after refining the color temperature adjusting circuit in an embodiment of the present disclosure;

[0028] Figure 3 is a hardware circuit block diagram schematic of a driving power supply after refining the low-voltage side circuit in an embodiment of the present disclosure;

[0029] Figure 4 is a hardware circuit block diagram schematic of a driving power supply after refining the coupling circuit in an embodiment of the present disclosure;

[0030] Figure 5 is a hardware circuit block diagram schematic of a driving power supply after refining the high-voltage side circuit in an embodiment of the present disclosure;

[0031] Figure 6 is a hardware circuit block diagram schematic of a driving power supply after refining the intelligent communication circuit in an embodiment of the present disclosure;

[0032] Figure 7 is a hardware circuit block diagram schematic of a driving power supply after refining the brightness adjusting circuit in an embodiment of the present disclosure;

[0033] Figure 8 is a power supply port voltage waveform schematic of a constant current control chip in an embodiment of the present disclosure;

[0034] Figure 9 is a working environment block diagram schematic of a lighting system in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] The embodiments of the present disclosure will be described in detail below, and the following description relates to the drawings, wherein the same numbers in different drawings represent the same or similar elements unless otherwise indicated. It is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0036] It should be understood that, in the description of all embodiments of the present disclosure, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. The terms "coupling", "connection" and the like should be interpreted broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected, or can be in communication with each other; it can be directly connected, or indirectly connected to form a linkage relationship through an intermediate medium, or it can be the internal communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0037] In various embodiments of the present disclosure, the symbol " / " represents the meaning of having two functions at the same time. And for the symbol "A and / or B", it means that the combination between the objects connected by the symbol includes "A", "B", "A and B".

[0038] In addition, the technical features involved in each of the embodiments of the present disclosure described below can be combined with each other as long as there is no conflict.

[0039] The embodiments of the present disclosure provide a highly integrated, low-cost, low-power drive power supply 100 for driving the luminaire 200 to intelligently dim, adjust color and switch on / off.

[0040] It can be understood that the luminaire 200 described in the embodiments of the present disclosure is a luminaire 200 with dimming and color adjusting capability. For example, in specific examples, it can be a LED lamp string containing at least two different color temperature (such as cool white and warm white) LED chips or lamp beads.

[0041] It can be understood that the luminaire 200 and the drive power supply 100 can be integrally arranged or separately arranged. If they are integrally arranged, the drive power supply 100 is a built-in module of the luminaire 200. If they are separately arranged, the drive power supply 100 can be placed in a separate housing and connected to the luminaire 200 through a wire.

[0042] For example, the drive power supply 100 can be a drive power supply 100 for driving the luminaire 200 to intelligently dim, adjust color and switch on / off. Figure 1As shown, it is a hardware circuit block diagram of a driving power supply 100 provided in an embodiment of the present disclosure. It can be seen that, in the embodiment of the present disclosure, the driving power supply 100 comprises an intelligent communication circuit 10, a color temperature adjustment circuit 20 and a power supply circuit 30.

[0043] The intelligent communication circuit 10 is configured to communicate with external devices, for example, to receive dimming, color adjusting and / or switching instructions from external devices through wireless protocols such as Bluetooth, Wi-Fi, Zigbee or wired ways, and to control the color temperature adjustment circuit 20 or a subsequent brightness adjustment circuit 3011 according to the instructions to adjust the color temperature and / or brightness of the lamp 200.

[0044] The color temperature adjustment circuit 20 is communicatively connected to the intelligent communication circuit 10 and configured to adjust the color temperature of the lamp 200 according to the received color temperature adjustment signal. The color temperature adjustment circuit 20 comprises an integrated color control module 201 communicatively connected to the intelligent communication circuit 10 and configured to adjust the color temperature of the lamp according to the color temperature adjustment signal sent by the intelligent communication circuit 10.

[0045] The power supply circuit 30 is configured to supply power to the intelligent communication circuit 10 in a non-isolated manner and to supply power to the integrated color control module 201 in an isolated manner.

[0046] The power supply circuit 30 is further configured to cause the supply voltage of the integrated color control module 201 to drop below the second input voltage range required for normal operation of the integrated color control module 201 when the brightness of the lamp 200 is adjusted to zero, thereby triggering the integrated color control module 201 to power off and stop working.

[0047] In the above-mentioned embodiment, the brightness state of the lamp 200 is coupled with the energy consumption state of the integrated color control module 201 by using the self-consistent power supply characteristics of the integrated color control module 201 to reduce power consumption: when the lamp 200 is off (brightness is zero), the power supply circuit is designed to cause the supply voltage of the integrated color control module 201 to naturally drop below its operating threshold, so that it automatically and completely enters the off state.

[0048] It is worth noting that the above-mentioned scheme not only simplifies the hardware, but also reduces the standby power consumption from the energy management level, and this process does not require additional detection and control circuits.

[0049] In some embodiments, the driving power supply 100 realizes automatic power-on of the integrated color control module 201 when the lamp is turned on by using the cooperative power supply scheme of the high-voltage side control circuit sharing the high-voltage DC bus 3014 and the low-voltage side color adjusting circuit sharing the low-voltage DC bus with the load, thereby achieving significant simplification of the circuit, significant reduction of the cost and reduction of the power consumption.

[0050] Specifically, as shown in Figure 1 The power supply circuit 30 includes a high-voltage side circuit 301, a low-voltage side circuit 302, and a coupling circuit 303.

[0051] The high-voltage side circuit 301 is configured to access commercial alternating current and perform rectification and filtering to form a high-voltage direct current bus 3014, which supplies power to the intelligent communication circuit 10 and a brightness adjustment circuit 3011.

[0052] The coupling circuit 303 is connected between the high-voltage side circuit 301 and the low-voltage side circuit 302, and is configured to achieve electrical isolation and complete transmission of energy and color temperature adjustment signals.

[0053] The low-voltage side circuit 302 receives energy from the high-voltage side circuit 301 through the coupling circuit 303, and forms a low-voltage direct current bus 3023, which supplies power to the color temperature adjustment circuit 20 and outputs a power supply output end 3022 for supplying power to the luminaire 200.

[0054] The intelligent communication circuit 10 and the brightness adjustment circuit 3011 share the high-voltage direct current bus 3014, and the color temperature adjustment circuit 20 and the power supply output end 3022 share the low-voltage direct current bus 3023.

[0055] As can be seen, in the present example, the intelligent communication circuit 10 serves as the control core, and the brightness adjustment circuit 3011 serves as the brightness execution unit, both of which obtain working power from the same stable high-voltage direct current bus 3014 after sufficient filtering. This design ensures the purity of the power supply for the intelligent control core, greatly improving the anti-interference ability and stability of wireless communication. The working power of the color temperature adjustment circuit 20 is not from an independent auxiliary power supply, but directly taken from the same low-voltage direct current bus 3023 that supplies power to the luminaire 200. This means that the color temperature adjustment circuit 20 and the luminaire 200 share the same power supply loop, achieving a great simplification of the power supply path.

[0056] Further, the above-mentioned circuit scheme eliminates the complexity of providing high-quality isolated power supply for the intelligent communication circuit 10 through the high-voltage side common bus, reduces the cost, and directly improves the reliability. By means of the low-voltage side common bus, the need for separately setting up a power supply circuit 30 (such as taking power from the auxiliary winding of the transformer or an additional DC-DC circuit) for the color adjusting circuit is eliminated, further simplifying the secondary circuit.

[0057] In other words, under the premise of ensuring safety isolation and complete functions, the present scheme maximally reduces the number of components, simplifies the circuit structure, and reduces the overall cost.

[0058] In some embodiments, the color temperature adjusting circuit 20 has a first input voltage operating range.

[0059] At least a part of the first input voltage range of the color temperature adjusting circuit 20 covers the first operating voltage range of the lamp 200, so that the color temperature adjusting circuit 20 can directly and stably obtain operating power from the power supply output end 3022 during the entire brightness adjustment process of the lamp 200, to ensure that the color temperature adjusting circuit 20 can stably obtain operating power from the low-voltage DC bus 3023 shared with the lamp 200, and the circuit design meets the key electrical parameter matching relationship. The first operating voltage range of the lamp 200 is the operating voltage range of the lamp 200 under constant current driving.

[0060] Specifically, the above-mentioned scheme realizes the "self-consistent power supply" of the color temperature adjusting circuit 20 through electrical parameter matching. Since at least a part of the first input voltage range of the color temperature adjusting circuit 20 covers the first operating voltage range of the lamp 200, the input voltage capability of the color temperature adjusting circuit 20 completely covers all voltage values that may occur during the operation of the lamp 200. Therefore, as long as the lamp 200 is turned on and generates an operating voltage, the voltage always falls within the input voltage range that the color temperature adjusting circuit 20 can normally handle, regardless of the brightness change of the lamp 200 (i.e., regardless of the adjustment of the constant current value flowing through the lamp 200). This ensures that the color temperature adjusting circuit 20 can always stably and reliably obtain operating power from its power supply output end 3022 (i.e., the low-voltage DC bus 3023) during the entire brightness adjustment process of the lamp 200, without the need for any form of secondary voltage stabilization or independent power supply circuit intervention.

[0061] Further, as shown in Figure 2 In one specific circuit implementation, the color temperature adjusting circuit 20 includes an integrated color adjusting control module 201 and a first voltage dividing circuit 202, and the integrated color adjusting control module 201 is connected to the low-voltage DC bus 3023 via the first voltage dividing circuit 202.

[0062] The first voltage dividing circuit 202 is configured to, in a state where the lamp 200 is turned on, divide the voltage from the low-voltage DC bus 3023 in the first working voltage range to a second input voltage range of the integrated color temperature adjustment control module 201 to supply power thereto; wherein the second input voltage range is a power supply voltage range (usually a lower voltage, such as 3.3V, 5V or similar chip working voltage) in which the integrated color temperature adjustment control module 201 can normally work.

[0063] Specifically, the lamp 200 includes an LED lamp string, under constant current driving, the forward voltage drop of which varies little in a very wide current range (approximately constant voltage source), which makes the "low-voltage DC bus 3023" voltage for supplying power fluctuate little in brightness adjustment, being a certain design range.

[0064] Exemplarily, the integrated color temperature adjustment control module 201 adopts a color temperature adjustment chip, such as BP5926X, which has a wide input voltage range voltage stabilizing circuit (for example, there is an 11V stabilizing tube between VH and VS, and VH has a GND voltage resistance of up to 600V), so that as long as the voltage drop of the LED lamp string is within its working voltage range (such as several tens of volts to several hundred volts), the chip can stably extract a small static working current (the data shows that the high-voltage side static current is only several tens of microamperes), without affecting the current distribution ratio of the LED lamp string.

[0065] It can be seen that in the present scheme, the color temperature adjustment circuit 20 completely "follows" the main output, and the power supply is highly self-consistent. The integrated color temperature adjustment control module 201 on the low-voltage side is directly powered by the LED lamp string load, and its working state automatically follows the brightness adjustment and changes coordinately, without the need for an independent voltage stabilizing power supply, simplifying the circuit structure and ensuring the independence of color temperature control at any brightness.

[0066] In some embodiments, as shown in Figure 3 The low-voltage side circuit 302 further includes a power failure protection circuit 3021 arranged between the power supply output end 3022 and the color temperature adjustment circuit 20 and configured to trigger the color temperature adjustment circuit 20 as a whole to enter a power failure protection state when the lamp 200 is short-circuited.

[0067] In other words, in the present embodiment, when a short-circuit fault occurs, the protection target is not just a certain power switch tube or part of components in the color temperature adjustment circuit 20, but to ensure that the entire color temperature adjustment function unit stops working immediately and completely, that is, enters the "overall power-down" state. This protection mechanism eliminates the possibility of abnormal operation of any part of the circuit in the fault state from the source of energy supply, thereby effectively preventing the expansion of the fault and protecting the expensive integrated chip from permanent damage due to local overcurrent, overheating or logic disorder, greatly improving the robustness and service life of the driving power supply 100.

[0068] Further, in a specific circuit example, the integrated color adjustment control module 201 of the color temperature adjustment circuit 20 includes a high-voltage power supply end (for example, for internal high-voltage side circuits, such as HV pins) and a low-voltage power supply end (for example, for internal logic and control circuits, such as VCC pins) isolated from each other. The high-voltage power supply end and the low-voltage power supply end are electrically isolated from each other.

[0069] The input end of the power-down protection circuit 3021 is electrically connected to the negative end of the power supply output end 3022, and the output end is electrically connected to the high-voltage power supply end and the low-voltage power supply end of the integrated color adjustment control module 201.

[0070] Specifically, the power-down protection circuit 3021 includes a voltage detection unit for monitoring the negative voltage of at least two different color temperature lamp strings of the lamp 200, and triggering a protection action when a short circuit is detected to pull down the high-voltage power supply end and the low-voltage power supply end of the integrated color adjustment control module 201 simultaneously, so as to determine the integrated color adjustment control module 201 to enter the overall power-down protection state.

[0071] Further, when a short circuit occurs at the output end (for example, an accidental short circuit between LED+ and LED-), the LED negative voltage, which should be close to the reference ground potential, will be pulled up instantaneously. The voltage detection unit will immediately trigger a protection action when it detects this abnormally high voltage signal representing a short circuit.

[0072] This "simultaneous pull-down of both sides of the power supply" ensures that both the high-voltage domain and the low-voltage domain inside the integrated color adjustment control module 201 lose the minimum energy supply required to maintain work at the same time, thereby forcibly and definitely driving the integrated color adjustment control module 201 to enter the overall power-down protection state. This is fundamentally different from "partial protection" or "logic shutdown" that only turns off a certain drive signal of the chip, realizes true "hard" protection, responds faster, the state is more certain, and there is no protection blind area.

[0073] It can be seen that the protection scheme adopted in this embodiment is deeply consistent with the architecture innovation of adopting the integrated color adjustment control module 201, and takes advantage of the feature of integrated module power supply concentration to realize "one-key shutdown" of the entire complex functional chip through a simple external circuit.

[0074] In the specific example, the integrated color adjustment control module 201 includes a color temperature adjustment chip (for example, BP5926X), a high-voltage power supply end (HV) and a low-voltage power supply end (VCC) of which are connected to a direct current power supply rail of the low-voltage side circuit 302 through a first voltage dividing resistor (as a pull-up resistor) in the first voltage dividing circuit 202, and the power failure protection circuit 3021 includes a first diode, a second diode, a first resistor, a second resistor, a first triode and a third resistor.

[0075] The anode of the first diode is electrically connected to the negative electrode of one light string, the anode of the second diode is electrically connected to the negative electrode of another light string, one end of the first resistor is electrically connected to the cathodes of the first diode and the second diode, one end of the second resistor is electrically connected to the other end of the first resistor, the base of the first triode is electrically connected between the first resistor and the second resistor, the collector is connected to the high-voltage power supply end and the low-voltage power supply end of the color temperature adjustment chip, and one end of the third resistor is electrically connected to the emitter of the first triode, the other end of the third resistor is electrically connected to the other end of the second resistor, and the other end of the third resistor is connected to the ground.

[0076] Based on the above circuit, taking the lamp 200 with two light strings of LEDs with different color temperatures as an example, the working principle of the power failure protection circuit 3021 is described as follows:

[0077] Normal state: when the lamp 200 works normally, the negative electrode voltage of the two light strings of LEDs is close to the ground potential (about 0V). At this time, the first diode and the second diode are cut off or only weakly conduct due to the low anode voltage. The voltage at the voltage dividing point of the first resistor and the second resistor to the ground (i.e. the base voltage of the first triode) is designed to be lower than the conduction threshold of the first triode (for example, about 0.6V-0.7V), so the first triode remains in the cut-off state. Its collector is in a high resistance state, which does not affect the color temperature adjustment chip to normally obtain the working voltage from the power supply rail through the first voltage dividing resistor.

[0078] Short circuit trigger: when a short circuit occurs to the ground (or to each other) of any one or both light strings of LEDs, the negative electrode voltage of the corresponding LED will instantaneously rise. The high voltage is introduced to the upper end of the first resistor through the corresponding diode (the first diode or the second diode). After being divided by the first resistor and the second resistor, a voltage sufficient to saturate the conduction of the first triode is generated at the base of the first triode.

[0079] Protection execution: the first triode quickly saturates and turns on. The low impedance between its collector and emitter is equivalent to pulling the upper pull-up path of the high-voltage power supply terminal and the low-voltage power supply terminal of the color temperature adjustment chip to near ground potential. This action instantly deprives the color temperature adjustment chip of its main operating voltage, causing all internal circuits, including high-voltage side drive and low-voltage side logic, to immediately and completely stop working due to power failure, i.e., enter the "overall power failure" state.

[0080] As can be seen, the above-mentioned circuit scheme uses a small number of low-cost discrete components to achieve fast (microsecond level), reliable, and radical protection for integrated chips.

[0081] In some embodiments, as shown in Figure 4 The coupling circuit 303 includes an energy coupling path 3031 and a signal coupling path 3032.

[0082] The energy coupling path 3031 is used to connect the high-voltage side circuit 301 and the low-voltage side circuit 302 in isolation, and is responsible for transmitting all the power required to drive the lamp 200.

[0083] The signal coupling path 3032 is used to connect the intelligent communication circuit 10 and the color temperature adjustment circuit 20 in isolation, and is responsible for transmitting the color temperature adjustment signal.

[0084] The energy coupling path 3031 and the signal coupling path 3032 are cooperatively structured (cooperatively structured in physical layout and electrical design) to jointly form a complete electrically isolated transmission channel for transmitting power energy and color temperature adjustment signals from the high-voltage side circuit 301 to the low-voltage side circuit 302 while achieving electrical isolation.

[0085] In other words, in the embodiments of the present disclosure, the isolation level, response speed, and anti-interference ability of the energy coupling path 3031 and the signal coupling path 3032 are considered as a whole to ensure that they work harmoniously and do not interfere with each other in the same electrically isolated system, so as to safely and reliably achieve electrical isolation between the high-voltage side and the low-voltage side while efficiently and accurately completing the bidirectional synchronous transmission of two types of different physical quantities, i.e., high-power power energy and low-power color temperature adjustment signals, from the high-voltage side to the low-voltage side.

[0086] Exemplarily, as shown in Figure 4 The brightness adjustment circuit 3011 includes a constant current control module 30111 composed of a constant current control chip (for example, a primary side feedback constant current control chip such as BP3176BF and its necessary peripheral circuit).

[0087] The energy coupling path 3031 includes a transformer, the primary winding of which is connected to the constant current control module 30111, and the output of the secondary winding of which, after rectification and filtering, forms a stable DC voltage rail, which constitutes the low-voltage DC bus 3023, and is used to be connected to the color temperature adjustment circuit 20 and the power supply output end 3022, so as to realize the isolated transmission of power energy; the intelligent communication circuit 10 is communicatively connected to the PWM pin of the constant current control module 30111, so as to adjust the output current of the transformer secondary through the constant current control module 30111.

[0088] Specifically, the primary winding of the transformer is connected to the power switch output end of the constant current control chip, and the secondary winding is connected to the low-voltage side, which provides the constant current power supply output end 3022 for the lamp 200, and also serves as the power supply source (i.e., the low-voltage DC bus 3023) of the color temperature adjustment circuit 20, so as to realize the isolated transmission of power energy. The intelligent communication circuit 10 is communicatively connected to the dimming signal input end (such as the DIM / PWM pin) of the constant current control chip through the I / O port thereof, so as to send a brightness adjustment signal.

[0089] Based on the above circuit, the intelligent communication circuit 10 is configured to generate and output a brightness adjustment signal in the form of a PWM (pulse width modulation) signal to the constant current control chip according to the dimming instruction received from the outside. The constant current control chip internally integrates a primary-side sampling and control logic. When it receives the PWM signal from the intelligent communication circuit 10, it analyzes the duty cycle of the signal and maps it to a target output current value. Subsequently, the constant current control chip precisely controls the current energy flowing through the primary winding of the transformer by adjusting the on-time and frequency of its internal power switch (i.e., the duty cycle and frequency of its internal power switch will change during dimming). According to the principle of electromagnetic induction, this controlled energy is coupled to the secondary winding of the transformer, and finally a stable output current proportional to the PWM duty cycle is generated on the secondary side. Therefore, by changing the duty cycle of the PWM signal output by the intelligent communication circuit 10, the brightness of the lamp 200 can be linearly and steplessly adjusted.

[0090] Further, the signal coupling path 3032 includes a signal coupler, the input end (located on the high-voltage side) of which is connected to the intelligent communication circuit 10, and the output end (located on the low-voltage side) of which is connected to the color temperature adjustment circuit 20, so as to realize the isolated transmission of the color temperature adjustment signal, and ensure that there is only a non-electrical form of contact, such as "light" or "magnetic field", between the circuit on the high-voltage side and the load driving circuit on the low-voltage side, thereby meeting the safety specifications.

[0091] Exemplarily, the signal coupler is realized in different physical principles, such as optical coupling, magnetic coupling, or capacitive coupling.

[0092] Taking the optical coupling as an example, the signal coupler adopts an opto-isolator, including a light-emitting device (for example, an LED) arranged in the high-voltage side circuit 301 and a light-sensitive device (for example, a phototransistor or an opto-integrated circuit) arranged in the low-voltage side circuit 302. The input end of the light-emitting device is connected with the intelligent communication circuit 10 to receive the color temperature adjustment signal, and the output end of the light-sensitive device is connected with the color temperature adjustment circuit 20 of the low-voltage side circuit 302, so that the color temperature adjustment signal is transmitted to the color temperature adjustment circuit 20 across the electrical isolation barrier by using light as a medium.

[0093] Based on the above circuit, the intelligent communication circuit 10 generates and outputs another color temperature adjustment signal in the form of PWM according to the color adjustment instruction received from the outside. The signal drives the light-emitting device of the opto-isolator to emit light, and the strength or on-off of the light is synchronized with the PWM signal. After the light-sensitive device senses the light, an electric signal proportional to the light intensity is generated, and the original PWM waveform is reproduced. The regenerated PWM signal is transmitted to the color temperature adjustment circuit 20, especially the integrated color adjustment control module 201 therein, which decodes the duty ratio and frequency of the PWM signal and accurately controls the conduction ratio of the two internal MOSFETs according to the PWM signal, so as to dynamically allocate the current flowing through the cold and warm color temperature LED lamp string, thereby realizing stepless color temperature adjustment from cold white light to warm yellow light.

[0094] As can be seen, the present embodiment clearly defines and realizes an efficient and reliable double-isolation transmission circuit architecture through the explicit division and collaborative design of the energy coupling path 3031 and the signal coupling path 3032. The circuit not only physically ensures safety isolation, but also functionally perfectly supports independent and accurate control of the two core lighting parameters of brightness and color temperature.

[0095] In some embodiments, the transformer is configured to have a specific turns ratio and winding process, so that when the constant current control module 30111 adjusts the output current of the transformer secondary to the brightness of the luminaire 200 to zero, the induced voltage and leakage energy of the secondary winding are sufficient to reduce the voltage of the low-voltage DC bus 3023 to a predetermined low level.

[0096] The color temperature adjustment circuit 20 further includes a first voltage dividing circuit 202, and the integrated color adjustment control module 201 is connected to the low-voltage DC bus 3023 via the first voltage dividing circuit 202.

[0097] The voltage dividing ratio of the first voltage dividing circuit 202 is specially set so that at the predetermined low level, the voltage dividing output value is lower than the minimum value of the second input voltage range of the integrated color adjustment control module 201, thereby triggering the integrated color adjustment module to power off and stop working; the second input voltage range is the power supply voltage range in which the integrated color adjustment control module can normally work.

[0098] Specifically, when the brightness of the lamp 200 is adjusted to zero by the intelligent communication circuit 10, the constant current control module 30111 on the high voltage side will stop or greatly reduce the energy transmission, causing the transformer secondary output to tend to zero, and further causing the voltage of the low voltage side DC power supply rail that supplies power to the LED lamp string to drop sharply or disappear. Since the integrated color control module 201 takes power from this power supply rail via the first voltage dividing circuit 202, the sharp drop in the voltage at the input end of the voltage dividing circuit directly causes the voltage at the output end (i.e., the voltage supplied to the chip) to also drop accordingly.

[0099] In the embodiments of the present disclosure, the parameters (voltage dividing ratio) of the first voltage dividing circuit 202 are matched with the lower limit of the second input voltage range of the integrated color control module 201, so that when the brightness of the lamp 200 is zero and the voltage of the low voltage DC bus 3023 drops below a certain critical value, the voltage provided by the first voltage dividing circuit 202 will not be enough to reach the minimum threshold of the second input voltage range required by the integrated color control module 201 to maintain normal operation. Therefore, the module will automatically power down due to undervoltage, and all internal circuits will stop running, with the static power consumption dropping to an extremely low level close to zero.

[0100] For example, the resistance of the first voltage dividing resistor is set to 10k-30k, such as 20k. The second input voltage range of the integrated color control module 201 can be understood as the normal operating voltage range of the color temperature adjustment chip. In this example, the color temperature adjustment chip can be selected as a chip of type BP5926X, which, in cooperation with the 20k first voltage dividing resistor, can divide the voltage from the low voltage side circuit 302 to the DC power supply rail to the normal operating voltage range of the color temperature adjustment chip to ensure the normal operation of the color temperature adjustment chip when the lamp 200 is turned on. When the brightness of the lamp 200 is adjusted to zero, the voltage after voltage division will not be enough to reach the normal operating voltage range of the color temperature adjustment chip, so that the color temperature adjustment chip is powered off and stops working in the state that the lamp 200 is turned off, thereby reducing the power consumption in the state that the lamp 200 is turned off. This design makes the working state of the color temperature adjustment circuit 20 naturally synchronized with the main output loop, that is, as long as the lamp 200 is turned on, there is power, and when the lamp 200 is turned off, it is naturally powered off, with clear and reliable logic.

[0101] In other words, in the present embodiment, through the multiple matching of the transformer parameters, the voltage dividing circuit parameters, and the electrical characteristics of the chip, a certain logic is formed: the integrated color control module 201 can only work when the lamp 200 is turned on, and once the lamp 200 is turned off, the module will inevitably be completely powered off due to undervoltage, thereby achieving natural and reliable synchronization of the state and the ultimate optimization of standby power consumption.

[0102] In some embodiments, asFigure 5 As shown, the high-voltage side circuit 301 further includes an electromagnetic interference filtering and rectifying circuit 3012 and a direct current filtering circuit 3013 connected in sequence, and an output end of the direct current filtering circuit 3013 is connected to a primary winding of the transformer to form a high-voltage direct current bus 3014 of the high-voltage side circuit 301.

[0103] The electromagnetic interference filtering and rectifying circuit 3012 functions to preprocess the input commercial alternating current. First, an electromagnetic interference filtering network (usually including common-mode inductance, X capacitor, Y capacitor, etc.) in it is used to suppress high-frequency interference noise from the power grid and prevent high-frequency switching noise generated by the drive power supply 100 itself from flowing back to the power grid to meet electromagnetic compatibility standards. Subsequently, a rectifier bridge or similar circuit converts the filtered alternating current into unidirectional pulsating direct current. For example, a voltage-dependent resistor can be included for overvoltage protection, a fuse for overcurrent protection, common-mode inductance, an X capacitor, and a full-bridge rectifier.

[0104] The direct current filtering circuit 3013 functions to smooth the rectified pulsating direct current to obtain a relatively stable direct current voltage with a low ripple factor. It consists of one or more electrolytic capacitors and possibly inductors to form a Π-type, LC, or RC filtering network for storing energy and releasing it when the rectified output voltage is low to maintain the bus voltage substantially constant. For example, a large-capacity electrolytic capacitor can be connected in parallel at the output end of the rectifier bridge as a bus capacitor to form a simple capacitor filtering circuit.

[0105] Further, as shown, Figure 6 The intelligent communication circuit 10 includes a Bluetooth communication module 101 (or other wireless / wired communication modules such as Wi-Fi, Zigbee modules) and a high-voltage step-down power supply module 102; the Bluetooth communication module 101 is powered by the high-voltage step-down power supply module 102, and an input end of the high-voltage step-down power supply module 102 is connected to an output end of the direct current filtering circuit 3013. In the embodiment of the disclosure, the high-voltage step-down power supply module 102 (for example, a non-isolated Buck-type step-down chip such as BP2525X) is specifically responsible for powering the Bluetooth communication module 101. The input end of the high-voltage step-down power supply module 102 is not connected to the direct output end of the rectifier bridge with relatively large noise, but is directly connected to the output end of the direct current filtering circuit 3013, that is, electricity is taken from the high-voltage direct current bus 3014.

[0106] Specifically, in the embodiment of the present disclosure, the intelligent communication circuit 10 takes power from the rear end of the DC filtering circuit 3013. Since the DC filtering circuit 3013 has greatly smoothed the voltage ripple after rectification and filtered out a large amount of high-frequency noise, it provides a relatively "clean" input voltage source for the high-voltage step-down power supply module 102. This makes the noise level of the 3.3V / 5V power supply generated for the Bluetooth communication module 101 extremely low. This design greatly improves the anti-power interference capability of the Bluetooth communication module 101, effectively reduces the problems of communication errors, connection interruptions or shortening of communication distance caused by power supply noise, and thus ensures the reliability and stability of the dimming, color adjusting and switching instruction receiving.

[0107] Further, as shown in Figure 7 The brightness adjusting circuit 3011 includes a constant current control module 30111 composed of a constant current control chip (such as a primary feedback PWM controller and its necessary peripheral elements) and a second voltage dividing circuit 30112. The second voltage dividing circuit 30112 is used to provide a working voltage (VCC) for the constant current control chip itself. The constant current control module 30111 is connected to the high-voltage DC bus 3014 via the second voltage dividing circuit 30112.

[0108] In the embodiment of the present disclosure, the constant current control chip and the transformer together constitute the core of a flyback switching power supply topology. The constant current control chip serves as both a function controller for adjusting brightness and a primary control core of the flyback circuit. Its specific function description is as follows: the constant current control chip controls the on-off of the transformer primary winding through its internal power MOSFET, stores the energy of the high-voltage DC bus 3014 in the transformer in the form of high-frequency pulses, and couples it to the secondary through the transformer. At the same time, the constant current control chip perceives the output state through primary sampling technology (without secondary optocoupler feedback), and combines the PWM brightness adjustment signal from the intelligent communication circuit 10 to adjust its switching pulse width and / or frequency in real time, so as to output a constant current with high precision and stepless adjustment from the transformer secondary, thereby directly controlling the brightness of the lamp 200. This integrated design realizes efficient power conversion, accurate constant current output and linear brightness adjustment, while greatly simplifying the peripheral circuit.

[0109] Further, the second voltage dividing circuit 30112 has a second voltage dividing resistor with a specific resistance value, such that: in the state that the lamp 200 is turned on, the voltage from the high-voltage DC bus 3014 is divided to the third input voltage range of the constant current control chip, to supply power for it; in the state that the brightness of the lamp 200 is adjusted to zero, the constant current control chip can be automatically triggered into an under-voltage protection state in it, or repeatedly jump between the under-voltage protection state and the state of attempting to start; wherein the third input voltage range is the power supply voltage range in which the constant current control module 30111 can normally work.

[0110] Specifically, in the state that the brightness of the lamp 200 is adjusted to zero, the constant current control chip is automatically in the under-voltage protection state or repeatedly jumps between the under-voltage protection state and the state of attempting to start without the assistance of an external circuit.

[0111] The third input voltage range of the constant current control module 30111 can be understood as the normal working voltage range of the constant current control chip. The transformer further includes an auxiliary winding. In the initial stage of starting, the second voltage dividing resistor reduces the high voltage from the high-voltage DC power rail to a safe and low voltage level through resistance current limiting, thereby providing the VCC pin of the constant current control chip with the voltage required for starting and steady-state working (such as 8V~40V). Once normal working is achieved, the VCC power supply of the constant current control chip can be switched to be provided by the auxiliary winding of the transformer, to achieve higher efficiency.

[0112] Further, the constant current control chip of the constant current control module 30111 has a specific static current consumption, which is cooperatively configured with the third input voltage range and the resistance value of the second voltage dividing resistor, such that: in the state that the brightness of the lamp 200 is adjusted to zero (i.e. off), the constant current control chip can be automatically triggered into an under-voltage protection state in it, or repeatedly jump between the under-voltage protection state and the state of attempting to start at a low frequency and low power consumption, to actively trigger and maintain the under-voltage protection state of the constant current control chip by utilizing the imbalance between the static current consumption of the constant current control chip itself and the tiny charging current provided by the mega-ohm starting resistor (second voltage dividing resistor), to further reduce the power consumption in the off state.

[0113] Taking the case that the constant current control chip can be automatically triggered to repeatedly jump between the under-voltage protection state and the state of attempting to start at a low frequency and low power consumption in the state that the brightness of the lamp 200 is adjusted to zero (i.e. off) as an example, further explanation and description are made:

[0114] The constant current control chip has a specific start voltage V_start (for example, 12V) and an under-voltage protection threshold V_uvlo (for example, 7.5V). The supply pin (VCC) of the constant current control chip is connected to the high-voltage DC bus 3014 through a second voltage dividing resistor (start resistor) R_start with a resistance up to the order of megaohm (for example, 1MΩ to 4MΩ).

[0115] When the luminous intensity of the lamp 200 is adjusted to zero, the switch action of the constant current control chip is stopped, and the auxiliary winding of the transformer for supplying power stops outputting due to no energy transmission. At this time, the only energy source for the VCC pin of the constant current control chip is the charging current I_charge provided by the high-voltage bus through R_start (I_charge ≈ V_bulk / R_start, for example, 300V / 2MΩ = 150μA).

[0116] In the embodiments of the present disclosure, the resistance of R_start is selected so that I_charge is less than or close to the static working current I_q of the constant current control chip in the non-switching state (for example, 500μA). Therefore, the net change of the charge on the capacitor of the VCC pin is negative, and the voltage continuously decreases from the normal working value. When the voltage decreases to V_uvlo, the constant current control chip enters the under-voltage protection off state, and the power consumption suddenly decreases. Thereafter, I_charge can recharge the VCC capacitor of the constant current control chip, the voltage rises, and after reaching V_start, the constant current control chip starts again, but quickly returns to the static state because the luminous intensity command is still zero, and the above process is repeated, and the average power consumption is controlled to be below tens of milliwatts.

[0117] In addition, the turns ratio of the auxiliary winding of the transformer is designed to provide sufficient supply voltage when the chip is normally switched, but the induced voltage needs to decay rapidly to be negligible when the chip is in standby and stops switching, so as to ensure the stability of the standby state is not disturbed.

[0118] Through the multiple precise matching of the high-voltage bus voltage, the start resistor resistance, the chip static current and the protection threshold, and the transformer auxiliary winding parameters, the determined behavior of 'the lamp is off, and the chip enters the periodic low-power consumption repeated jump state or the completely off state' is forcibly set, so that the ultra-low standby power consumption is realized without any additional discrete element on-off control circuit.

[0119] Further, if the constant current control chip can be automatically triggered to repeatedly jump between the under-voltage protection state and the state of attempting to start in the state where the luminous intensity of the lamp is adjusted to zero, the voltage at the supply port of the constant current control chip presents a triangular waveform.

[0120] Exemplarily, in one specific embodiment, the resistance value of the second voltage dividing resistor is 2MΩ. The constant current control chip can adopt a high-performance isolated low-power factor adjustable light LED driver chip, such as BP3176BF. The chip is designed for flyback topology structure, supports PWM and analog dimming, and its key electrical parameters include: the typical value of starting voltage is 12V (range 10V-14V), the typical value of under-voltage protection is 7.5V (range 6.6V-8.6V), and the typical value of static working current is 500μA.

[0121] Therefore, the design synergy based on the above parameters is clear: when a 2MΩ starting resistor is connected between the high-voltage DC bus 3014 of about 300V and the constant current control chip VCC, the maximum theoretical charging current it provides is only I = V / R = 300V / 2MΩ = 150μA. This current value is of the same order of magnitude as the static working current of the chip, or even smaller. Therefore, after the constant current control chip stops switching and loses auxiliary winding power supply due to zero brightness, the voltage on the VCC capacitor of the constant current control chip cannot be maintained and will gradually decrease from the normal working voltage (such as 12V or more). Once it drops to the under-voltage protection point of about 7.5V, the constant current control chip enters the off state, and the power consumption drops sharply. Thereafter, the 150μA small current will begin to charge the VCC capacitor of the constant current control chip, slowly pull up the voltage, until it reaches the starting threshold of about 12V, and the constant current control chip tries to start again, and the cycle repeats, presenting a triangular waveform as shown in Figure 8 The entire process can reduce the power consumption of the power supply in the off state to below 0.3w.

[0122] As can be seen, the present disclosure achieves the ultra-low standby power consumption target that traditionally requires complex circuits through the precise collaborative design of chip internal characteristics and simple peripheral elements in an extremely simple and economical way.

[0123] In addition, as shown in Figure 9 Based on the driving power supply 100 provided in the foregoing embodiments, the present disclosure correspondingly provides a lighting system in one embodiment of the present application.

[0124] The lighting system mainly comprises a driving power supply 100 and a lamp 200. The driving power supply 100 adopts the driving power supply 100 as described in the foregoing embodiments. The driving power supply 100 integrates intelligent control, high-efficiency energy conversion, precise brightness and color temperature adjustment, and multiple protection functions. The lamp 200 has at least two lamp strings with different color temperatures. For example, it can include a LED lamp string with cold white color temperature (such as 6000K) and a LED lamp string with warm white color temperature (such as 2700K). The two lamp strings can be independently packaged or integrated in a way of eutectic, chip level or module level. The driving power supply 100 is electrically connected to the lamp 200 to adjust the brightness and color temperature of the lamp 200. The interface of the lamp 200 includes a common positive input terminal and negative output terminals corresponding to the two lamp strings with different color temperatures respectively.

[0125] In the lighting system, the driving power supply 100 and the lamp 200 are electrically connected through wires or connectors. Specifically, the output terminals (i.e. low-voltage DC bus 3023 and color temperature adjustment output terminals) of the low-voltage side circuit 302 of the driving power supply 100 are connected to the corresponding input terminals of the lamp 200. The driving power supply 100 is responsible for receiving dimming, color adjustment and / or switching instructions from the external device 300. Specifically, the driving power supply 100 and the external device 300 can establish a communication connection through Bluetooth direct connection, or access an external network through a network access device (such as establishing a WIFI connection through a router, accessing a Bluetooth mesh network through a Bluetooth gateway, etc.), and then establish a remote communication connection with the external device 300 through the external network to receive the instructions.

[0126] In the description of the present specification, the description of the terms "some embodiments", "a specific embodiment", "a specific implementation process", "an example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative expressions of the above-mentioned terms can be combined with the specific features, structures, materials or characteristics described in any one or more embodiments or examples in a suitable manner.

[0127] In addition, it should be noted that the above-mentioned embodiments can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments. That is, the technical solutions disclosed in the latter embodiment (recorded in the order of the text) should include the technical solutions recorded in this embodiment and the technical solutions in all the embodiments before this embodiment.

[0128] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, and are not intended to limit the present disclosure; although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A driving power supply for driving a lamp, characterized in that, include: Intelligent communication circuits are used for external communication; The color temperature adjustment circuit has an integrated color adjustment module; The integrated color-tuning module is communicatively connected to the intelligent control circuit and is used to adjust the color temperature of the lamps according to the color temperature adjustment signal emitted by the circuit. A power supply circuit is configured to supply power to the intelligent communication circuit in a non-isolated manner and to supply power to the integrated color tuning module in an isolated manner; The power supply circuit is further configured such that when the brightness of the lamp is adjusted to zero, the power supply voltage of the integrated color tuning module drops below the second input voltage range required for its normal operation, thereby triggering the integrated color tuning module to power off and stop working.

2. The driving power supply according to claim 1, characterized in that, The power supply circuit includes: The high-voltage side circuit is used to connect to the AC mains power and perform rectification and filtering to form a high-voltage DC bus, which supplies power to the intelligent communication circuit and a brightness adjustment circuit; the brightness adjustment circuit is communicatively connected to the intelligent communication circuit and is used to adjust the brightness of the lamp. A coupling circuit, connected between a high-voltage side circuit and a low-voltage side circuit, is used to achieve electrical isolation and to transmit energy and color temperature adjustment signals; The low-voltage side circuit receives energy from the high-voltage side circuit through the coupling circuit and forms a low-voltage DC bus, which supplies power to the color temperature adjustment circuit and outputs a power supply output terminal for powering the lamps. The intelligent communication circuit and the brightness adjustment circuit share the high-voltage DC bus, and the color temperature adjustment circuit and the power supply output terminal share the low-voltage DC bus.

3. The driving power supply according to claim 2, characterized in that, The color temperature adjustment circuit has a first input voltage operating range; Wherein, at least a portion of the first input voltage range of the color temperature adjustment circuit covers the first operating voltage range of the lamp, so that the color temperature adjustment circuit can stably obtain operating power directly from the power supply output terminal during the entire brightness adjustment process of the lamp; the first operating voltage range of the lamp is the operating voltage range of the lamp under constant current drive.

4. The driving power supply according to claim 3, characterized in that, The color temperature adjustment circuit includes an integrated color control module and a first voltage divider circuit. The integrated color control module is connected to the low-voltage DC bus via the first voltage divider circuit. The first voltage divider circuit is configured to, when the lamp is lit, divide the voltage from the low-voltage DC bus, which is within the first operating voltage range, to a second input voltage range of the integrated color control module to power it. The second input voltage range is the power supply voltage range within which the integrated color control module can operate normally.

5. The driving power supply according to claim 2, characterized in that, The coupling circuit includes: Energy coupling path, used to isolate the high-voltage side circuit and the low-voltage side circuit; The signal coupling path is used to isolate the connection between the intelligent communication circuit and the color temperature adjustment circuit; The energy coupling path and the signal coupling path are constructed together to form a complete electrically isolated transmission channel, which is used to transmit power energy and color temperature adjustment signals from the high-voltage side circuit to the low-voltage side circuit while achieving electrical isolation.

6. The driving power supply according to claim 5, characterized in that, The brightness adjustment circuit includes a constant current control module composed of a constant current control chip; The energy coupling path includes a transformer, the primary winding of which is connected to the constant current control module. The output of the secondary winding of the transformer, after rectification and filtering, forms a stable DC voltage rail that constitutes the low-voltage DC bus, which is used to connect to the color temperature adjustment circuit and the power supply output terminal to achieve isolated transmission of power energy. The intelligent communication circuit is communicatively connected to the PWM pin of the constant current control module to adjust the secondary output current of the transformer through the constant current control module. The signal coupling path includes a signal coupler, whose input end is connected to the intelligent communication circuit and whose output end is connected to the color temperature adjustment circuit, so as to realize the isolated transmission of the color temperature adjustment signal; the signal coupler is implemented by at least one of optical coupling, magnetic coupling, and capacitive coupling.

7. The driving power supply according to claim 6, characterized in that, The transformer is constructed with a specific turns ratio and winding process so that when the constant current control module adjusts the secondary output current of the transformer to the state where the brightness of the lamp drops to zero, the induced voltage and leakage inductance energy release of the secondary winding are sufficient to reduce the low-voltage DC bus voltage to a predetermined low level. The color temperature adjustment circuit includes an integrated color control module and a first voltage divider circuit. The integrated color control module is connected to the low-voltage DC bus via the first voltage divider circuit. The voltage division ratio of the first voltage divider circuit is specifically set so that, under the predetermined low level, its voltage division output value is lower than the minimum value of the second input voltage range of the integrated color grading control module, thereby triggering the integrated color grading module to power down and stop working; the second input voltage range is the power supply voltage range in which the integrated color grading control module can work normally.

8. The driving power supply according to claim 6, characterized in that, The high-voltage side circuit includes an electromagnetic interference filter and rectifier circuit and a DC filter circuit connected in sequence. The output terminal of the DC filter circuit is connected to the primary winding of the transformer to form the high-voltage DC bus of the high-voltage side circuit. The intelligent communication circuit includes a Bluetooth communication module and a high-voltage step-down power supply module; the Bluetooth communication module is powered by the high-voltage step-down power supply module, and the input terminal of the high-voltage step-down power supply module is connected to the output terminal of the DC filter circuit. The brightness adjustment circuit includes a constant current control module composed of a constant current control chip, and a second voltage divider circuit; the constant current control module is connected to the high voltage DC bus via the second voltage divider circuit. The second voltage divider circuit includes a second voltage divider resistor with a specific resistance value, such that: when the lamp is lit, the voltage from the high-voltage DC bus is divided to the third input voltage range of the constant current control chip to power it; when the lamp brightness is adjusted to zero, the constant current control chip can be automatically triggered to enter its internal undervoltage protection state, or repeatedly switch between the undervoltage protection state and the attempt to start state; wherein, the third input voltage range is the power supply voltage range within which the constant current control module can operate normally.

9. The driving power supply according to claim 8, characterized in that, The constant current control chip of the constant current control module has a specific static current consumption. This static current consumption, the third input voltage range, and the resistance value of the second voltage divider resistor are configured in a coordinated manner so that: when the brightness of the lamp is adjusted to zero, the constant current control chip can be automatically triggered to enter its internal undervoltage protection state, or repeatedly switch between the undervoltage protection state and the attempt to start state.

10. The driving power supply according to claim 9, characterized in that, If the constant current control chip can be automatically triggered to repeatedly switch between undervoltage protection state and attempt to start state when the brightness of the lamp is adjusted to zero, the voltage at the power supply port of the constant current control chip will show a triangular waveform.

11. A lighting system, characterized in that, Including the drive power supply as described in any one of claims 1 to 10, and, A lighting fixture with at least two strings of lights of different color temperatures; The driving power supply is electrically connected to the lamp to adjust the brightness and color temperature of the lamp.

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