A driver for supplying multiple LED channels

Abstract

The application discloses a driver for supplying multiple LED channels, which is applied to the lighting field and comprises a master control module, a PFC module, multiple DC / DC modules and multiple constant current control modules. The master control module samples output electric signals of the DC / DC modules and obtains output powers of the DC / DC modules, judges demand states of the DC / DC modules and issues different superimposed signals to the constant current control module; the constant current control module sends control signals to the DC / DC modules; the DC / DC modules further provide electric energy to the LED; and the PFC module accesses a power supply to perform power factor correction. The master control module obtains the powers of the DC / DC modules by sampling the output electric signals of the DC / DC modules, controls the constant current control circuit, and further makes the power transfer among the DC / DC modules by controlling the current values output by the DC / DC modules.

Description

Technical Field

[0001] This utility model relates to the field of lighting, and in particular to a driver that can supply multiple LEDs. Background Technology

[0002] Currently, the rated power of LED drivers used in the lighting field is usually fixed, meaning the maximum output power is limited. This is due to the internal circuitry of the LED driver. For example, the power circuit responsible for transmitting and converting power in the driver is typically implemented in two stages. The first-stage power circuit receives AC power such as mains voltage and converts it into a DC voltage with a constant amplitude. The second-stage power circuit receives the DC voltage and converts it into a DC current with a stable amplitude, which is then output to the LED.

[0003] Although commercially available drivers have dimming capabilities, they typically set the output power to maximum and then reduce it to achieve dimming, thus regulating the LED power. They lack the ability to increase the power beyond the maximum for bidirectional LED power adjustment. Furthermore, within a lighting system, the various LED drivers do not have the capability to transfer power between each other as needed.

[0004] Therefore, there is an urgent need for an LED driver that can adjust the output power of LEDs to meet the different power requirements of different LEDs in different situations, while saving LED energy supply. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a driver that can supply power to multiple LEDs, solving the problem of different LEDs having different power requirements in different situations. The specific solution is as follows:

[0006] In a first aspect, this application provides a driver that can supply multiple LEDs, including: a main control module, a PFC module, multiple DC / DC modules and multiple constant current control modules;

[0007] The input terminal of the main control module is connected to the output terminal of each DC / DC module, and is used to sample the output power of each DC / DC module;

[0008] The output terminal of the main control module is connected to the control terminal of each constant current control module, and is used to send a superimposed signal to the corresponding constant current control module based on the output power of the DC / DC module.

[0009] The output terminal of the constant current control module is connected to the input terminal of the corresponding DC / DC module, and is used to send a control signal to the DC / DC module based on the superimposed signal and the output electrical signal of the DC / DC module; wherein, the constant current control circuit includes a PI regulator, the superimposed signal is superimposed on the input terminal of the PI regulator, and the output power of the DC / DC module is changed by changing the current value set by the PI regulator; so that the PI regulator in the constant current control circuit realizes the power transfer between the DC / DC modules by controlling the current value of each constant current control circuit;

[0010] The output terminal of the DC / DC module is connected to the corresponding LED and is used to provide power to the LED based on the control signal. When no power transfer is performed, the DC / DC module outputs power no greater than the rated power. When the PI regulator controls the current value of each constant current control circuit to realize power transfer between DC / DC modules, the maximum power output by the DC / DC module can be greater than the rated power output by the DC / DC module.

[0011] The input terminal of the PFC module is connected to a power source, and the output terminal of the PFC module is connected to the input terminal of the DC / DC module.

[0012] Optionally, the constant current control module further includes: a DC / DC controller and a superposition circuit, the superposition circuit including: a first resistor; the PI regulator including: a first operational amplifier, a second resistor, a third resistor and a first capacitor;

[0013] The first end of the first resistor is connected to the output end of the main control module as the control terminal of the constant current control module.

[0014] The second end of the first resistor is connected to the first end of the second resistor, the first end of the third resistor, and the inverting input of the first operational amplifier;

[0015] The non-inverting input terminal of the first operational amplifier is connected to the first reference voltage;

[0016] The second end of the third resistor is connected to the output end of the DC / DC module as the input end of the constant current control module.

[0017] The second end of the second resistor is connected to the first end of the first capacitor;

[0018] The second terminal of the first capacitor and the output terminal of the first operational amplifier are connected to the input terminal of the DC / DC controller;

[0019] The output terminal of the DC / DC controller is connected to the input terminal of the DC / DC module as the output terminal of the constant current control module.

[0020] Optionally, the constant current control module includes: a DC / DC controller and a superposition circuit, the superposition circuit including: a first resistor; the PI regulator includes: a first operational amplifier, a second resistor, a third resistor, a fourth resistor and a first capacitor;

[0021] The first end of the first resistor is connected to the output end of the main control module as the control terminal of the constant current control module.

[0022] The second end of the first resistor and the first end of the second resistor are connected to the non-inverting input terminal of the first operational amplifier;

[0023] The second terminal of the second resistor is connected to the first reference voltage;

[0024] The second end of the fourth resistor is connected to the output end of the DC / DC module as the input end of the constant current control module.

[0025] The first end of the third resistor and the first end of the fourth resistor are connected to the inverting input terminal of the first operational amplifier;

[0026] The second end of the third resistor is connected to the first end of the first capacitor;

[0027] The second terminal of the first capacitor and the output terminal of the first operational amplifier are connected to the input terminal of the DC / DC controller;

[0028] The output terminal of the DC / DC controller is connected to the input terminal of the DC / DC module as the output terminal of the constant current control module.

[0029] Optionally, the DC / DC module includes: a first switching transistor, a second switching transistor, a first diode, a second diode, a first inductor, a second capacitor, a third capacitor, a transformer, and a fifth resistor;

[0030] The control terminals of the first and second switching transistors are connected to the output terminal of the constant current control module as the input terminal of the DC / DC module.

[0031] The first switch, the second switch, the first inductor, the second capacitor, and the transformer are connected to form the primary side circuit of the transformer;

[0032] The first diode, the second diode, the third capacitor, and the transformer are connected to form the secondary side circuit of the transformer;

[0033] The third capacitor serves as an output capacitor, with its first terminal connected to the LED and its second terminal connected to the LED through the fifth resistor;

[0034] The common terminal of the fifth resistor connected to the LED is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

[0035] Optionally, the DC / DC module includes: a first switching transistor, a first diode, a second capacitor, a transformer, and a fifth resistor;

[0036] The control terminal of the first switching transistor is connected to the output terminal of the constant current control module as the input terminal of the DC / DC module.

[0037] The first switching transistor is connected in series with the transformer to form the primary side circuit of the transformer;

[0038] The first diode, the second capacitor, and the transformer are connected to form the secondary side circuit of the transformer;

[0039] The second capacitor serves as an output capacitor, with its first terminal connected to the LED and its second terminal connected to the LED through the fifth resistor.

[0040] The common terminal of the fifth resistor connected to the LED is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

[0041] Optionally, the DC / DC module includes: a first switching transistor, a first diode, a first inductor, and a second capacitor;

[0042] The control terminal of the first switching transistor is connected to the output terminal of the constant current control module as the input terminal of the DC / DC module.

[0043] The first terminal of the first switching transistor is connected to the positive input terminal;

[0044] The second terminal of the first switching transistor and the cathode of the first diode are connected to the first terminal of the first inductor;

[0045] The anode of the first diode and the second terminal of the second capacitor are connected to the negative input terminal;

[0046] The second end of the first inductor is connected to the first end of the second capacitor, and their common end is connected to the output end of the DC / DC module and the input end of the constant current control module.

[0047] Optionally, the PFC module includes: a rectifier circuit, a PFC main circuit, and a main circuit control circuit;

[0048] The input terminal of the rectifier circuit is connected to the power supply as the input terminal of the PFC module.

[0049] The output terminal of the rectifier circuit is connected to the input terminal of the PFC main circuit;

[0050] The output terminal of the PFC main circuit is connected to the input terminal of the DC / DC module as the output terminal of the PFC module.

[0051] The input terminal of the main circuit control circuit is connected to the sampling output terminal of the PFC main circuit, and the output terminal of the main circuit control circuit is connected to the control terminal of the PFC main circuit.

[0052] Optionally, the main circuit control circuit includes: a PFC controller, a second operational amplifier, a fourth capacitor, and a sixth resistor;

[0053] The first end of the sixth resistor is connected to the inverting input of the second operational amplifier, and the common end of the two is connected to the sampling output of the PFC main circuit as the input of the main circuit control circuit.

[0054] The non-inverting input of the second operational amplifier is connected to the second reference voltage;

[0055] The second end of the sixth resistor is connected to the first end of the fourth capacitor;

[0056] The second terminal of the fourth capacitor and the output terminal of the second operational amplifier are connected to the input terminal of the PFC controller;

[0057] The output terminal of the PFC controller is connected to the control terminal of the PFC main circuit as the output terminal of the main circuit control circuit.

[0058] Optionally, the PFC main circuit includes: a second inductor, a third switching transistor, a third diode, a fifth capacitor, a seventh resistor, and an eighth resistor;

[0059] The control terminal of the third switch is connected to the output terminal of the main circuit control circuit as the control terminal of the PFC main circuit.

[0060] The first terminal of the second inductor is connected to the first output terminal of the rectifier circuit;

[0061] The second terminal of the second inductor and the first terminal of the third switching transistor are connected to the anode of the third diode;

[0062] The second terminal of the third switch, the first terminal of the fifth capacitor, and the second terminal of the eighth resistor are connected to the second output terminal of the rectifier circuit.

[0063] The cathode of the third diode, the second terminal of the fifth capacitor, and the first terminal of the seventh resistor are connected.

[0064] The second end of the seventh resistor is connected to the first end of the eighth resistor, and their common end is connected to the sampling output terminal of the PFC main circuit and the input terminal of the main circuit control circuit.

[0065] Optionally, the PFC main circuit includes: a second inductor, a third switching transistor, a third diode, and a fifth capacitor;

[0066] The control terminal of the third switch is connected to the output terminal of the main circuit control circuit as the control terminal of the PFC main circuit.

[0067] The first terminal of the third switching transistor is connected to the first output terminal of the rectifier circuit.

[0068] The second terminal of the third switch, the cathode of the third diode, and the first terminal of the second inductor are connected.

[0069] The anode of the third diode and the second terminal of the fifth capacitor are connected to the second output terminal of the rectifier circuit;

[0070] The second end of the second inductor is connected to the first end of the fifth capacitor, and their common end is connected to the sampling output terminal of the PFC main circuit and the input terminal of the main circuit control circuit.

[0071] Therefore, the driver for supplying multiple LEDs in this application includes: a main control module, a PFC module, multiple DC / DC modules, and multiple constant current control modules. This application uses the main control module to sample the output electrical signals of each DC / DC module and obtain the output power of each DC / DC module. Based on the output power of the DC / DC modules, it determines the demand state of the DC / DC modules and sends control signals to the constant current control modules, sending different superimposed signals. The constant current control module sends control signals to the DC / DC modules based on the superimposed signals and the output electrical signals of the DC / DC modules. The DC / DC modules then provide power to the LEDs based on the control signals. The PFC module's power supply rectifies the AC power and converts it into a DC bus voltage for power factor correction. In this application, multiple sets of corresponding constant current control circuits and DC / DC modules correspond to the DC bus voltage output by the same PFC module. By sampling the output electrical signal of the DC / DC module, the main control module obtains the power of each DC / DC module and controls the constant current control circuit, so that the constant current control circuit generates different controls for different DC / DC modules. In turn, by controlling the current value output by the DC / DC module, the power transfer between the DC / DC modules is achieved, so that the DC / DC module can provide different power to the LEDs under different demand states while saving energy. Attached Figure Description

[0072] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0073] Figure 1 A driver system framework diagram for supplying multiple LEDs is provided as an embodiment of this application;

[0074] Figure 2 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0075] Figure 3 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0076] Figure 4 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0077] Figure 5 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0078] Figure 6 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0079] Figure 7 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0080] Figure 8 A circuit diagram of a specific driver for supplying multiple LEDs is provided for an embodiment of this application;

[0081] Figure 9 This application provides a specific circuit diagram of a driver that can supply multiple LEDs. Detailed Implementation

[0082] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0083] The core of this application is to provide a driver that can supply multiple LEDs.

[0084] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0085] Currently, LED drivers used in lighting applications typically have a fixed rated power, meaning their maximum output power is limited. This is due to the internal circuitry of the LED driver. For example, the power circuit responsible for transmitting and converting power in the driver is generally implemented in two stages: the front-stage power circuit receives AC power from the mains and converts it into a DC voltage with a constant amplitude; the rear-stage power circuit receives the DC voltage and converts it into a DC current with a stable amplitude, which is then output to the LED. Although some drivers have dimming capabilities, they usually set the output power to the maximum setting and reduce the power output from that setting to achieve dimming and thus regulate the LED power. They do not have the capability to increase the power output from the maximum setting for bidirectional power adjustment. Therefore, there is an urgent need for an LED driver that can adjust the LED output power to meet the different power requirements of different LEDs in different situations while conserving LED energy.

[0086] like Figure 1As shown, this utility model embodiment discloses a driver that can supply multiple LEDs, including: a main control module, a PFC (Power Factor Correction) module, multiple DC / DC modules, and multiple constant current control modules;

[0087] The input terminal of the main control module is connected to the output terminal of each DC / DC module to sample the output power of each DC / DC module;

[0088] The output terminal of the main control module is connected to the control terminal of each constant current control module, and is used to send superimposed signals to the corresponding constant current control module based on the output power of the DC / DC module.

[0089] The output of the constant current control module is connected to the input of the corresponding DC / DC module. It sends control signals to the DC / DC module based on the superimposed signal and the output electrical signal of the DC / DC module. The constant current control circuit includes a PI (proportional integral) regulator. The superimposed signal is applied to the input of the PI regulator. By changing the current value set by the PI regulator, the output power of the DC / DC module is changed. This allows power transfer between the DC / DC modules to be achieved by controlling the current values ​​of each constant current control circuit through the PI regulator in the constant current control circuit.

[0090] The output of the DC / DC module is connected to the corresponding LED to provide power to the LED based on the control signal. When no power transfer is performed, the DC / DC module outputs power no greater than the rated power. When the PI regulator controls the current value of each constant current control circuit to realize the power transfer between the DC / DC modules, the maximum output power of the DC / DC module can be greater than the rated power of the DC / DC module.

[0091] The input terminal of the PFC module is connected to the power supply, and the output terminal of the PFC module is connected to the input terminal of the DC / DC module.

[0092] This embodiment provides a driver capable of supplying power to multiple LEDs. Its structure mainly includes a main control module, a PFC module, multiple DC / DC modules, and multiple constant current control modules. The input terminal of the main control module is connected to the output terminal of each DC / DC module, enabling it to sample the output power of each DC / DC module and thus obtain the operating status information of each module. Its output terminal is connected to the control terminal of each constant current control module, and based on the sampled output power of the DC / DC modules, it sends a superimposed signal to the corresponding constant current control module.

[0093] The output of the constant current control module is connected to the input of the corresponding DC / DC module. It can send control signals to the DC / DC module based on the superimposed signal and the output electrical signal of the DC / DC module. The constant current control circuit includes a PI regulator. The superimposed signal is applied to the input of the PI regulator, thereby changing the current value set by the PI regulator, ultimately altering the output power of the DC / DC module, thus achieving power transfer between the various DC / DC modules.

[0094] The output of the DC / DC module is connected to the corresponding LED. When no power transfer is performed, it provides power to the LED at a power output not exceeding its rated power. However, when power transfer between DC / DC modules is achieved by controlling the current values ​​of each constant current control circuit through a PI regulator, the maximum output power of the DC / DC module can exceed its rated power. The input of the PFC module is connected to the power supply, and its output is connected to the input of the DC / DC module. It can perform power factor correction on the input power supply, improving energy utilization efficiency.

[0095] Therefore, it can be seen that in this application, multiple sets of corresponding constant current control circuits and DC / DC modules correspond to the DC bus voltage output by the same PFC module. By sampling the output electrical signal of the DC / DC module, the main control module obtains the power of each DC / DC module and controls the constant current control circuit, so that the constant current control circuit generates different controls for different DC / DC modules. In turn, by controlling the current value output by the DC / DC module, the power transfer between the DC / DC modules is achieved, so that the DC / DC module can provide different power energy to the LEDs under different demand states while saving energy consumption.

[0096] like Figure 2 As shown, this utility model embodiment discloses a specific driver that can supply multiple LEDs. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically, the constant current control module also includes: a DC / DC controller and a superposition circuit. The superposition circuit includes: a first resistor R1; the PI regulator includes: a first operational amplifier OP1, a second resistor R2, a third resistor R3, and a first capacitor C1.

[0097] The first end of the first resistor R1 is connected to the output end of the main control module as the control terminal of the constant current control module.

[0098] The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the first terminal of the third resistor R3, and the inverting input terminal of the first operational amplifier OP1.

[0099] The non-inverting input terminal of the first operational amplifier OP1 is connected to the first reference voltage;

[0100] The second end of the third resistor R3 is connected to the output end of the DC / DC module as the input end of the constant current control module.

[0101] The second terminal of the second resistor R2 is connected to the first terminal of the first capacitor C1;

[0102] The second terminal of the first capacitor C1 and the output terminal of the first operational amplifier OP1 are connected to the input terminal of the DC / DC controller.

[0103] The output of the DC / DC controller is connected to the input of the DC / DC module as the output of the constant current control module.

[0104] In this embodiment, the constant current control circuit consists of a DC / DC controller, a PI regulator, and a superposition circuit. The superposition circuit is composed of a first resistor R1, and the PI regulator is composed of a first operational amplifier OP1 and its peripheral circuits.

[0105] In the constant current control circuit, the negative phase input terminal of the first operational amplifier OP1 is connected to the sampling resistor of the LED load to sample the voltage signal of the output current of the DC / DC module. The first resistor R1 of the superposition circuit in the constant current control circuit is connected to the output terminal of the main control module to receive the superposition signal of the main control module. The first resistor R1 superimposes the voltage signal of the LED load current with the superposition signal and uses it as the new input signal of the first operational amplifier OP1, which is output to the negative phase input terminal of the first operational amplifier OP1. The first operational amplifier OP1 compares the new input signal with the preset reference signal Vref1, amplifies the error, and outputs a control signal that reflects the magnitude of the output current of the DC / DC module.

[0106] The input terminal of the DC / DC controller is connected to the output terminal of the first operational amplifier OP1 to obtain a control signal that reflects the magnitude of the output current of the DC / DC module. Based on the control signal, a drive signal is output to the main control switch of the DC / DC module to control the on / off state of the main control switch and adjust the magnitude of the output current of the DC / DC module.

[0107] Therefore, this embodiment, by connecting the negative inverting input terminal of the first operational amplifier OP1 in the constant current control circuit to the third resistor R3 of the sampling resistor of the LED load, can accurately sample the voltage signal of the output current of the DC / DC module. This precise signal sampling and processing method, along with the control strategy of error amplification through the operational amplifier, can improve the control accuracy of the DC / DC module's output current, making the output current more stable, thereby ensuring stable LED illumination and improving the performance and reliability of the entire system.

[0108] like Figure 3As shown, this utility model embodiment discloses a specific driver that can supply multiple LEDs. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically: the constant current control module includes: a DC / DC controller and a superposition circuit, the superposition circuit including: a first resistor R1; the PI regulator includes: a first operational amplifier OP1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1;

[0109] The first end of the first resistor R1 is connected to the output end of the main control module as the control terminal of the constant current control module.

[0110] The second end of the first resistor R1 and the first end of the second resistor R2 are connected to the non-inverting input terminal of the first operational amplifier OP1;

[0111] The second terminal of the second resistor R2 is connected to the first reference voltage;

[0112] The second end of the fourth resistor R4 is connected to the output end of the DC / DC module as the input end of the constant current control module.

[0113] The first terminal of the third resistor R3 and the first terminal of the fourth resistor R4 are connected to the inverting input terminal of the first operational amplifier OP1;

[0114] The second terminal of the third resistor R3 is connected to the first terminal of the first capacitor C1;

[0115] The second terminal of the first capacitor C1 and the output terminal of the first operational amplifier OP1 are connected to the input terminal of the DC / DC controller.

[0116] The output of the DC / DC controller is connected to the input of the DC / DC module as the output of the constant current control module.

[0117] In this embodiment, the superposition circuit is composed of the fourth resistor R4, and the PI regulator is composed of the first operational amplifier OP1 and its peripheral circuits.

[0118] The non-inverting input of the first operational amplifier OP1 is connected to the main control module through the first resistor R1 of the superposition circuit. It is used to receive the superposition signal of the main control module. The first reference voltage Vref1 is superimposed with the superposition signal through the first resistor R1 via the fourth resistor R4, and then used as the new reference signal of the first operational amplifier OP1. It is output to the non-inverting input of the first operational amplifier OP1. The first operational amplifier OP1 compares the input signal with the new reference signal, amplifies the error, and outputs a control signal that reflects the magnitude of the output current of the DC / DC module.

[0119] As can be seen, the embodiments of this application have further refined and optimized the circuit structure of the constant current control module. The first reference voltage Vref1 is superimposed with the superimposed signal through the first resistor R1 via the fourth resistor R4 to form a new reference signal. This signal superposition method can more accurately adjust and control the input signal, enhance the signal processing capability of the entire circuit, and provide a more accurate basis for subsequent current control.

[0120] like Figure 4 As shown, this utility model embodiment discloses a specific driver that can supply multiple LEDs. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically, the DC / DC module includes: a first switching transistor Q1, a second switching transistor Q2, a first diode D1, a second diode D2, a first inductor L1, a second capacitor C2, a third capacitor C3, a transformer T1, and a fifth resistor R5;

[0121] The control terminals of the first switch Q1 and the second switch Q2 are connected as the input terminals of the DC / DC module and the output terminals of the constant current control module.

[0122] The first switch Q1, the second switch Q2, the first inductor L1, the second capacitor C2 and the transformer T1 are connected to form the primary side circuit of the transformer T1;

[0123] The first diode D1, the second diode D2, the third capacitor C3, and the transformer T1 are connected to form the secondary side circuit of the transformer T1;

[0124] The third capacitor C3 serves as the output capacitor, with its first terminal connected to the LED and its second terminal connected to the LED through the fifth resistor R5.

[0125] The common terminal of the fifth resistor R5 connected to the LED is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

[0126] In this embodiment, the DC / DC module is an LLC resonant converter circuit composed of first switching transistors Q1 and Q2, first inductor L1, transformer T1, first diode D1, second diode D2, and third capacitor C3. First switching transistors Q1 and Q2 are connected in series and then in parallel at the output of the PFC main circuit to receive the output voltage. The common terminal of first switching transistors Q1 and Q2 is connected sequentially to the same-name terminals of the primary windings of first inductor L1 and transformer T1. The secondary winding of transformer T1 is connected to a rectifier module, which consists of first diode D1 and second diode D2. The anode of first diode D1 is connected to the same-name terminal of the secondary winding of transformer T1, and the cathode is connected to the load. The anode of second diode D2 is connected to the opposite-name terminal of the secondary winding of transformer T1, and the cathode is connected to the load. One end of the third capacitor C3 is connected to the load LED, and the other end is connected to the center tap of the secondary winding of transformer T1. The input terminals of the constant current control circuit are connected to the sampling resistor R1 at the negative terminal of the LED load and the main control module, respectively, to receive the current signal from the LED load and the superimposed signal from the main control module. The first operational amplifier OP1 processes the signal and feeds it back to the DC / DC controller. The DC / DC controller is connected to the first switch Q1 and the second switch Q2, and is used to control the on / off state of the first switch Q1 and the second switch Q2 in the DC / DC module according to the feedback signal, so as to realize the current control of the DC / DC module.

[0127] Therefore, the DC / DC module in this embodiment is implemented using an LLC resonant converter circuit. This circuit uses a resonant inductor and capacitor to form a resonant network. When operating near the resonant frequency, the switching transistor can achieve zero-voltage turn-on and zero-current turn-off. When the transistor is turned on, the voltage across it is zero due to the resonant network, significantly reducing turn-on losses. When the transistor is turned off, the current is zero, resulting in near-zero turn-off losses. Simultaneously, the primary and secondary current waveforms of transformer T1 are close to a sine wave, leading to high core utilization and low losses. Furthermore, the rectifier diodes operate under near-sine current in the resonant converter circuit, resulting in low reverse recovery losses. This minimizes energy loss and improves energy efficiency. This not only reduces power system heat generation and improves system reliability but also reduces the requirements for heat dissipation devices, lowering overall costs.

[0128] like Figure 5 As shown, this embodiment of the utility model discloses a specific driver capable of supplying multiple LEDs. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically, the DC / DC module includes: a first switching transistor Q1, a first diode D1, a second capacitor C2, a transformer T1, and a fifth resistor R5;

[0129] The control terminal of the first switching transistor Q1 is connected to the output terminal of the constant current control module as the input terminal of the DC / DC module.

[0130] The first switch Q1 is connected in series with the transformer T1 to form the primary side circuit of the transformer T1;

[0131] The first diode D1, the second capacitor C2, and the transformer T1 are connected to form the secondary side circuit of the transformer T1;

[0132] The second capacitor C2 serves as the output capacitor, with its first terminal connected to the LED and its second terminal connected to the LED through the fifth resistor R5.

[0133] The common terminal of the fifth resistor R5 connected to the LED is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

[0134] In this embodiment, the DC / DC module is a flyback converter circuit composed of a first switch Q1, a transformer T1, a first diode D1, and a second capacitor C2. The output terminal of the PFC main circuit is connected to the same-name terminal of the primary winding of transformer T1, and the opposite-name terminal of the primary winding of transformer T1 is connected to the output terminal of the PFC main circuit through the first switch Q1; the opposite-name terminal of the secondary winding of transformer T1 is connected to the same-name terminal of the secondary winding of transformer T1 through the first diode D1 and the second capacitor C2 in sequence.

[0135] Therefore, in this embodiment, the DC / DC module is implemented by a flyback converter circuit. Under the action of the constant current control circuit, when the switching transistor is turned on, the primary winding of transformer T1 stores energy, and the secondary winding has no output. When the switching transistor is turned off, the primary winding of transformer T1 releases energy, and the secondary winding generates an induced electromotive force, which supplies power to the load through the diode. Due to the isolation effect of transformer T1, there is no direct electrical connection between the input side and the output side, achieving electrical isolation. This effectively prevents electrical interference on the input side from affecting the output side, improving the circuit's anti-interference capability and safety.

[0136] like Figure 6 As shown, this embodiment of the present invention discloses a specific driver capable of supplying multiple LEDs. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically, the DC / DC module includes: a first switching transistor Q1, a first diode D1, a first inductor L1, and a second capacitor C2;

[0137] The control terminal of the first switching transistor Q1 is connected to the output terminal of the constant current control module as the input terminal of the DC / DC module.

[0138] The first terminal of the first switching transistor Q1 is connected to the positive input terminal;

[0139] The second terminal of the first switch Q1 and the cathode of the first diode D1 are connected to the first terminal of the first inductor L1;

[0140] The anode of the first diode D1 and the second terminal of the second capacitor C2 are connected to the negative input terminal.

[0141] The second terminal of the first inductor L1 is connected to the first terminal of the second capacitor C2, and their common terminal is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

[0142] In this embodiment, the DC / DC module is a Buck circuit composed of a second inductor L2, a first switch Q1, a first diode D1, and a second capacitor C2. In the Buck circuit, when the first switch Q1 is turned on, power is supplied to the load LED through the first switch Q1 and the second inductor L2, while the second inductor L2 stores energy. At this time, the first diode D1 is reverse-biased and does not conduct. When the switch is turned off, the energy stored in the second inductor L2 continues to supply power to the load through the first diode D1, maintaining the stability of the voltage across the load. The on / off state of the first switch Q1 is controlled by the DC / DC controller, thus adjusting the output voltage to achieve a step-down function. This provides a stable low-voltage power supply for LED lighting, ensuring its normal operation. Simultaneously, when the first switch Q1 is turned on, its on-resistance is small, resulting in low losses; while when turned off, almost no current flows, and losses are also minimal. The first diode D1 mainly serves as a freewheeling diode in the circuit, and its forward voltage drop is relatively low. The filter circuit composed of the second inductor L2 and the second capacitor C2 can effectively reduce the ripple of the output voltage, making the output voltage more stable and reducing energy loss due to ripple. At the same time, since the Buck circuit has a relatively simple structure, the parasitic parameters in the circuit have a small impact on efficiency.

[0143] Therefore, the Buck circuit in this embodiment can reduce energy loss, improve power utilization efficiency, enhance system reliability, reduce the requirements for heat dissipation devices, and lower overall costs. It extends battery life or reduces energy consumption while ensuring normal equipment operation.

[0144] like Figure 7 As shown, this utility model embodiment discloses a specific driver capable of supplying multiple LEDs. Compared to the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically, the PFC module includes: a rectifier circuit, a PFC main circuit, and a main circuit control circuit;

[0145] The input terminal of the rectifier circuit is connected to the power supply as the input terminal of the PFC module.

[0146] The output terminal of the rectifier circuit is connected to the input terminal of the PFC main circuit;

[0147] The output of the PFC main circuit is connected to the input of the DC / DC module as the output of the PFC module.

[0148] The input terminal of the main circuit control circuit is connected to the sampling output terminal of the PFC main circuit, and the output terminal of the main circuit control circuit is connected to the control terminal of the PFC main circuit.

[0149] Among them, such as Figure 7 As shown, the main circuit control circuit includes: a PFC controller, a second operational amplifier OP2, a fourth capacitor C4, and a sixth resistor R6;

[0150] The first end of the sixth resistor R6 is connected to the inverting input of the second operational amplifier OP2, and the common end of the two is connected to the sampling output of the PFC main circuit as the input of the main circuit control circuit.

[0151] The non-inverting input terminal of the second operational amplifier OP2 is connected to the second reference voltage;

[0152] The second terminal of the sixth resistor R6 is connected to the first terminal of the fourth capacitor C4;

[0153] The second terminal of the fourth capacitor C4, the output terminal of the second operational amplifier OP2, and the input terminal of the PFC controller are connected.

[0154] The output of the PFC controller is connected to the control terminal of the PFC main circuit as the output of the main circuit control circuit.

[0155] In this embodiment, the PFC controller circuit controls the third switch Q3 to achieve power factor correction of the PFC main circuit; the seventh resistor R7 and the eighth resistor R8 are connected in series and then in parallel across the PFC bus capacitor C5; the common terminal of the seventh resistor R7 and the eighth resistor R8 is connected to the negative input terminal of the operational amplifier OP2. The operational amplifier OP2 receives the sampling signal representing the bus voltage signal of the main circuit, compares it with the second reference voltage vref2, and generates a feedback signal connected to the PFC controller circuit, thereby driving the PFC controller output signal to control the third switch Q3, thereby achieving voltage regulation of the PFC bus voltage.

[0156] In one specific implementation, such as Figure 7 As shown, the PFC main circuit includes: a second inductor L2, a third switch Q3, a third diode D3, a fifth capacitor C5, a seventh resistor R7, and an eighth resistor R8.

[0157] The control terminal of the third switch Q3 is connected to the output terminal of the main circuit control circuit as the control terminal of the PFC main circuit.

[0158] The first terminal of the second inductor L2 is connected to the first output terminal of the rectifier circuit;

[0159] The second terminal of the second inductor L2, the first terminal of the third switch Q3, and the anode of the third diode D3 are connected;

[0160] The second terminal of the third switch Q3, the first terminal of the fifth capacitor C5, and the second terminal of the eighth resistor R8 are connected to the second output terminal of the rectifier circuit.

[0161] The cathode of the third diode D3, the second terminal of the fifth capacitor C5, and the first terminal of the seventh resistor R7 are connected.

[0162] The second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8, and their common end is connected to the sampling output terminal of the PFC main circuit and the input terminal of the main circuit control circuit.

[0163] In another specific implementation, such as Figure 8 As shown, the PFC main circuit includes: a second inductor L2, a third switch Q3, a third diode D3, and a fifth capacitor C5;

[0164] The control terminal of the third switch Q3 is connected to the output terminal of the main circuit control circuit as the control terminal of the PFC main circuit.

[0165] The first terminal of the third switching transistor Q3 is connected to the first output terminal of the rectifier circuit;

[0166] The second terminal of the third switch Q3 and the cathode of the third diode D3 are connected to the first terminal of the second inductor L2.

[0167] The anode of the third diode D3 and the second terminal of the fifth capacitor C5 are connected to the second output terminal of the rectifier circuit.

[0168] The second terminal of the second inductor L2 is connected to the first terminal of the fifth capacitor C5, and their common terminal is connected to the sampling output terminal of the PFC main circuit and the input terminal of the main circuit control circuit.

[0169] In this embodiment, the PFC main circuit module is a Buck circuit composed of a second inductor L2, a third switch Q3, a third diode D3, and a fifth capacitor C5. This voltage reduction method can convert a higher input voltage into a lower, stable output voltage. In particular, it can provide a stable low-voltage power supply in circuit systems of LED devices that have high voltage accuracy requirements, ensuring their normal operation.

[0170] like Figure 9 As shown, this embodiment of the present invention discloses a specific driver capable of supplying multiple LEDs. Compared to the previous embodiment, this embodiment further explains and optimizes the technical solution. Specifically:

[0171] The power conversion between DC / DC modules depends on the load conditions of each LED. For example, the switching frequency of an LLC (Logical Link Control) converter operating in continuous conduction mode can depend on the output load conditions. Typically, LLC converters operate above resonance, so that as the output load increases, the switching frequency decreases to meet higher power demands.

[0172] like Figure 9 As shown, the driver that can supply multiple LEDs has two outputs. The first inductor L1 and the second inductor L4 in the first DC / DC module and the second DC / DC module are energy storage elements that store energy by means of a magnetic field. The stored electrical energy is proportional to its own inductance and the square of the current flowing through it. When the two DC / DC modules are working normally under load, the main control module does not operate, and each constant current control circuit stabilizes the current of the DC / DC module at a constant value.

[0173] When the first LED load is lightly loaded and the second LED load is heavily loaded; in the first DC / DC branch, when the lighting demand changes from the normal load state to the light load state of the first LED load, the main control module determines that the first DC / DC module is in the first demand state and outputs a high level to the first PI regulator. The original sampling signal of the first operational amplifier OP1 in the PI regulator is superimposed with the output voltage of the main control module through the fifth resistor R5 and the third resistor R3. The superimposed level is input to the inverting input terminal of the first operational amplifier OP1.

[0174] In the second DC / DC branch, when the lighting demand changes from the normal load state to the heavy load state of the second LED load, the main control module determines that the second DC / DC module is in the second demand state and outputs a high level to the second PI regulator. The original sampling signal of the third operational amplifier OP3 in the PI regulator is superimposed with the output voltage of the main control module through resistor R13 and resistor R14. The superimposed level is input to the inverting input terminal of the third operational amplifier OP3.

[0175] By interfering with the sampling signal of the PI regulator loop, the preset current value of each constant current control circuit is changed, thereby adjusting the output power of each DC / DC module and realizing power transfer between DC / DC modules.

[0176] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A driver capable of supplying multiple LEDs, characterized in that, include: Main control module, PFC module, multiple DC / DC modules and multiple constant current control modules; The input terminal of the main control module is connected to the output terminal of each DC / DC module, and is used to sample the output power of each DC / DC module; The output terminal of the main control module is connected to the control terminal of each constant current control module, and is used to send a superimposed signal to the corresponding constant current control module based on the output power of the DC / DC module. The output terminal of the constant current control module is connected to the input terminal of the corresponding DC / DC module, and is used to send a control signal to the DC / DC module based on the superimposed signal and the output electrical signal of the DC / DC module; wherein, the constant current control module includes a PI regulator, the superimposed signal is superimposed on the input terminal of the PI regulator, and the output power of the DC / DC module is changed by changing the current value set by the PI regulator; so that the PI regulator in the constant current control module realizes power transfer between the DC / DC modules by controlling the current value of each constant current control module; The output terminal of the DC / DC module is connected to the corresponding LED and is used to provide power to the LED based on the control signal. When no power transfer is performed, the DC / DC module outputs power no greater than the rated power. When the PI regulator controls the current value of each constant current control module to realize power transfer between DC / DC modules, the maximum power output by the DC / DC module can be greater than the rated power output by the DC / DC module. The input terminal of the PFC module is connected to a power source, and the output terminal of the PFC module is connected to the input terminal of the DC / DC module.

2. The driver capable of supplying multiple LEDs according to claim 1, characterized in that, The constant current control module further includes: a DC / DC controller and a superposition circuit, the superposition circuit including: a first resistor; the PI regulator including: a first operational amplifier, a second resistor, a third resistor and a first capacitor; The first end of the first resistor is connected to the output end of the main control module as the control terminal of the constant current control module. The second end of the first resistor is connected to the first end of the second resistor, the first end of the third resistor, and the inverting input of the first operational amplifier; The non-inverting input terminal of the first operational amplifier is connected to the first reference voltage; The second end of the third resistor is connected to the output end of the DC / DC module as the input end of the constant current control module. The second end of the second resistor is connected to the first end of the first capacitor; The second terminal of the first capacitor and the output terminal of the first operational amplifier are connected to the input terminal of the DC / DC controller; The output terminal of the DC / DC controller is connected to the input terminal of the DC / DC module as the output terminal of the constant current control module.

3. The driver capable of supplying multiple LEDs according to claim 1, characterized in that, The constant current control module includes a DC / DC controller and a superposition circuit, the superposition circuit including a first resistor; the PI regulator includes a first operational amplifier, a second resistor, a third resistor, a fourth resistor, and a first capacitor; The first end of the first resistor is connected to the output end of the main control module as the control terminal of the constant current control module. The second end of the first resistor and the first end of the second resistor are connected to the non-inverting input terminal of the first operational amplifier; The second terminal of the second resistor is connected to the first reference voltage; The second end of the fourth resistor is connected to the output end of the DC / DC module as the input end of the constant current control module. The first end of the third resistor and the first end of the fourth resistor are connected to the inverting input terminal of the first operational amplifier; The second end of the third resistor is connected to the first end of the first capacitor; The second terminal of the first capacitor and the output terminal of the first operational amplifier are connected to the input terminal of the DC / DC controller; The output terminal of the DC / DC controller is connected to the input terminal of the DC / DC module as the output terminal of the constant current control module.

4. The driver capable of supplying multiple LEDs according to any one of claims 1 to 3, characterized in that, The DC / DC module includes: a first switching transistor, a second switching transistor, a first diode, a second diode, a first inductor, a second capacitor, a third capacitor, a transformer, and a fifth resistor; The control terminals of the first and second switching transistors are connected to the output terminal of the constant current control module as the input terminal of the DC / DC module. The first switch, the second switch, the first inductor, the second capacitor, and the transformer are connected to form the primary side circuit of the transformer; The first diode, the second diode, the third capacitor, and the transformer are connected to form the secondary side circuit of the transformer; The third capacitor serves as an output capacitor, with its first terminal connected to the LED and its second terminal connected to the LED through the fifth resistor; The common terminal of the fifth resistor connected to the LED is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

5. The driver capable of supplying multiple LEDs according to any one of claims 1 to 3, characterized in that, The DC / DC module includes: a first switching transistor, a first diode, a second capacitor, a transformer, and a fifth resistor; The control terminal of the first switching transistor is connected to the output terminal of the constant current control module as the input terminal of the DC / DC module. The first switching transistor is connected in series with the transformer to form the primary side circuit of the transformer; The first diode, the second capacitor, and the transformer are connected to form the secondary side circuit of the transformer; The second capacitor serves as an output capacitor, with its first terminal connected to the LED and its second terminal connected to the LED through the fifth resistor. The common terminal of the fifth resistor connected to the LED is connected as the output terminal of the DC / DC module and the input terminal of the constant current control module.

6. The driver capable of supplying multiple LEDs according to any one of claims 1 to 3, characterized in that, The DC / DC module includes: a first switching transistor, a first diode, a first inductor, and a second capacitor; The control terminal of the first switching transistor is connected to the output terminal of the constant current control module as the input terminal of the DC / DC module. The first terminal of the first switching transistor is connected to the positive input terminal; The second terminal of the first switching transistor and the cathode of the first diode are connected to the first terminal of the first inductor; The anode of the first diode and the second terminal of the second capacitor are connected to the negative input terminal; The second end of the first inductor is connected to the first end of the second capacitor, and their common end is connected to the output end of the DC / DC module and the input end of the constant current control module.

7. The driver capable of supplying multiple LEDs according to claim 1, characterized in that, The PFC module includes: a rectifier circuit, a PFC main circuit, and a main circuit control circuit; The input terminal of the rectifier circuit is connected to the power supply as the input terminal of the PFC module. The output terminal of the rectifier circuit is connected to the input terminal of the PFC main circuit; The output terminal of the PFC main circuit is connected to the input terminal of the DC / DC module as the output terminal of the PFC module. The input terminal of the main circuit control circuit is connected to the sampling output terminal of the PFC main circuit, and the output terminal of the main circuit control circuit is connected to the control terminal of the PFC main circuit.

8. The driver capable of supplying multiple LEDs according to claim 7, characterized in that, The main circuit control circuit includes: a PFC controller, a second operational amplifier, a fourth capacitor, and a sixth resistor; The first end of the sixth resistor is connected to the inverting input of the second operational amplifier, and the common end of the two is connected to the sampling output of the PFC main circuit as the input of the main circuit control circuit. The non-inverting input of the second operational amplifier is connected to the second reference voltage; The second end of the sixth resistor is connected to the first end of the fourth capacitor; The second terminal of the fourth capacitor and the output terminal of the second operational amplifier are connected to the input terminal of the PFC controller; The output terminal of the PFC controller is connected to the control terminal of the PFC main circuit as the output terminal of the main circuit control circuit.

9. The driver capable of supplying multiple LEDs according to claim 8, characterized in that, The PFC main circuit includes: a second inductor, a third switching transistor, a third diode, a fifth capacitor, a seventh resistor, and an eighth resistor; The control terminal of the third switch is connected to the output terminal of the main circuit control circuit as the control terminal of the PFC main circuit. The first terminal of the second inductor is connected to the first output terminal of the rectifier circuit; The second terminal of the second inductor and the first terminal of the third switching transistor are connected to the anode of the third diode; The second terminal of the third switch, the first terminal of the fifth capacitor, and the second terminal of the eighth resistor are connected to the second output terminal of the rectifier circuit. The cathode of the third diode, the second terminal of the fifth capacitor, and the first terminal of the seventh resistor are connected. The second end of the seventh resistor is connected to the first end of the eighth resistor, and their common end is connected to the sampling output terminal of the PFC main circuit and the input terminal of the main circuit control circuit.

10. The driver capable of supplying multiple LEDs according to claim 8, characterized in that, The PFC main circuit includes: a second inductor, a third switching transistor, a third diode, and a fifth capacitor; The control terminal of the third switch is connected to the output terminal of the main circuit control circuit as the control terminal of the PFC main circuit. The first terminal of the third switching transistor is connected to the first output terminal of the rectifier circuit. The second terminal of the third switch, the cathode of the third diode, and the first terminal of the second inductor are connected. The anode of the third diode and the second terminal of the fifth capacitor are connected to the second output terminal of the rectifier circuit; The second end of the second inductor is connected to the first end of the fifth capacitor, and their common end is connected to the sampling output terminal of the PFC main circuit and the input terminal of the main circuit control circuit.

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