Dimmable LED power supply system and biological lighting system

Abstract

The invention discloses a dimmable LED power supply system and a biological lighting system in the technical field of light source lighting. The power supply system comprises a management and control module, an AC / DC module, a bidirectional DC / DC module, an energy storage battery and an LED driving module. The management and control module is used for controlling the working modes of the AC / DC module and the bidirectional DC / DC module according to the acquired network access electric charge; when the power supply system is connected with a power grid, the AC / DC module converts three-phase alternating current provided by the power grid into direct current; the bidirectional DC / DC module is used for performing voltage conversion on the direct current output by the AC / DC module and then storing the direct current in the energy storage battery when the power supply system is connected with a power grid; when the power supply system is disconnected from the power grid, the direct current output by the energy storage battery is subjected to voltage conversion and then is output to the LED driving module; the method can achieve the optimal use of electric energy, improves the utilization rate of the whole power grid, and reduces the power utilization cost of a user.

Description

Technical Field

[0001] This application relates to the technical field of light source lighting, and particularly to a dimmable LED power supply system and a biological lighting system. Background Art

[0002] In the modern lighting field, LEDs (Light Emitting Diodes) are widely used in various scenarios due to their significant advantages such as energy conservation, long lifespan, and fast response speed. From ordinary household lighting to display lighting in commercial spaces, from traffic signal lights to stage lighting arrangements, LED lighting has gradually become the mainstream choice.

[0003] Currently, the power supply systems for the vast majority of LED loads rely on the mains power grid for power supply. This power supply method has a simple connection. Just connect the LED lighting device to the mains power, and it can provide a stable AC power supply for the LED load. After being processed by circuits such as rectification and voltage regulation, it is converted into the DC power supply required by the LEDs. This mode, relying on the wide coverage and high stability of the mains power grid, meets the lighting needs of most environments. However, the electricity price of the mains power grid is not constant and will fluctuate significantly due to factors such as time, season, and region. For example, during peak electricity consumption periods, in order to balance power supply and demand, the grid connection electricity price often increases significantly. But the existing LED load power supply systems based on a single mains power grid supply lack a perception and response mechanism for changes in the grid connection electricity price. No matter how the electricity price changes, they always maintain the original power supply mode and cannot adjust the power supply strategy according to the real-time electricity price. When the grid connection electricity price is high, users still use LED lighting devices in the conventional way, which will lead to a significant increase in electricity costs and has obvious deficiencies in terms of economy. Summary of the Invention

[0004] The purpose of this application is to provide a dimmable LED power supply system and a biological lighting system, which can adjust the power supply mode of the LED load according to the grid connection electricity price, achieve the optimal use of electric energy, and reduce the user's electricity cost.

[0005] To achieve the above object, the following technical solutions are adopted in this application: On the one hand, this application provides a dimmable LED power supply system, including a control module, an AC / DC module, a bidirectional DC / DC module, and a storage battery; The control module is used to control the working modes of the AC / DC module and the bidirectional DC / DC module according to the obtained grid connection electricity price; The AC / DC module is used to connect and disconnect the power supply system from the power grid according to the control of the control module, and when the power supply system is connected to the power grid, it converts the three-phase alternating current provided by the power grid into direct current for the LED load and the storage battery to store energy; The bidirectional DC / DC module is configured to, under the control of the control module, convert the DC power output by the AC / DC module and store it in the energy storage battery when the power supply system is connected to the power grid; and when the power supply system is disconnected from the power grid, convert the DC power output by the energy storage battery and supply it to the LED load for use.

[0006] In combination with the first aspect, further, an LED driving module is further included. The LED driving module includes a Boost sub-module and a PFC control sub-module. The control signal output terminal of the PFC control sub-module is connected to the control terminal of the Boost sub-module. The PFC control sub-module receives the DC input voltage signal provided by the AC / DC module, as well as the voltage feedback signal and current feedback signal at the output terminal of the Boost sub-module, and processes the DC input voltage signal and the feedback signals according to the internal preset logic to adjust the output current of the Boost sub-module, thereby adjusting the light intensity of the LED load; Wherein, the Boost sub-module includes a power inductor, a freewheeling diode D103, an output capacitor, and a power switch; The output capacitor is connected in parallel across both ends of the LED load; One end of the power inductor is connected to the DC output terminal of the AC / DC module, and the other end is connected to one end of the output capacitor and one end of the LED load after being connected in series with the freewheeling diode D103; the other end of the output capacitor and the other end of the LED load are both grounded; The drain of the power switch is connected between the power inductor and the freewheeling diode D103, the gate is connected to the control signal output terminal of the PFC control sub-module, and the source is grounded; The PFC control sub-module adjusts the on-time and off-time ratio of the power switch to achieve the adjustment of the output voltage and output current of the Boost sub-module, and further adjusts the light intensity of the LED load.

[0007] In combination with the first aspect, further, the PFC control sub-module includes an L6562 chip; The GD pin of the L6562 chip is electrically connected to the gate of the power switch; The ZCD pin of the L6562 chip is connected to the detection winding to detect the current flowing through the power inductor. When the current flowing through the power inductor is zero, the L6562 chip triggers the power switch to turn on, so that the circuit operates in the critical conduction mode; The MULT pin of the L6562 chip is connected to the DC output terminal of the AC / DC module in series through a resistor, and is used for sampling the DC input voltage; The multiplier inside the L6562 chip multiplies the collected DC input voltage by the output signal of the error amplifier inside the L6562 chip to obtain a reference current signal, so as to control the on and off time of the power switch tube in the Boost sub-module.

[0008] In combination with the first aspect, further, the CS pin of the L6562 chip is connected to the source electrode of the power switch tube after being serially connected with a resistor R104, and is also grounded through multiple parallel resistors; The resistor R104 and the parallel resistors are used to convert the current signal in the circuit into a voltage signal. When there is an overcurrent flowing through the power switch tube, the voltage signal collected by the CS pin exceeds the threshold set inside the L6562 chip, and the L6562 chip triggers an overcurrent protection mechanism to turn off the power switch tube.

[0009] In combination with the first aspect, further, the PFC control sub-module further includes a triode Q107, and the base of the triode Q107 is connected to the emitter after being serially connected with a diode D104; The GD pin of the L6562 chip is connected to the base of the triode Q107 after being serially connected with a resistor R107, the collector of the triode Q107 is grounded after being serially connected with a resistor R120, and the emitter is connected to the gate of the power switch tube after being serially connected with a resistor R170; The triode Q107 is used to amplify the driving signal output by the GD pin of the L6562 chip in terms of current and provide a driving current for the gate of the power switch tube.

[0010] In combination with the first aspect, further, the VCC pin of the L6562 chip is connected to a DC voltage source after being serially connected with a current-limiting resistor R108; The DC voltage source is connected to the INV pin of the L6562 chip after being serially connected with a voltage-dividing resistor R132, a diode D101, and a diode D105, and is used to provide a reference voltage for the L6562 chip; The anode of the diode D101 is connected to the collector of the triode Q101, the emitter of the triode Q101 is grounded, and the base is connected to the control module; the cathode of the diode D101 is also grounded through a parallel-connected resistor R131 and a capacitor C109; The DC output terminal of the AC / DC module is grounded after being serially connected with a diode D102, a voltage-dividing network, and a resistor R101; The INV pin is connected to the electrical connection point of the voltage-dividing network and the resistor R101.

[0011] In combination with the first aspect, further, the COMP pin of the L6562 chip is grounded through a compensation network, and the compensation network includes a capacitor C113 and a resistor R62 and a capacitor C24 connected in series and in parallel across the capacitor C113.

[0012] In combination with the first aspect, further, the AC / DC module employs a three-phase fully controlled rectifier bridge composed of six thyristors; The bidirectional DC / DC module includes a thyristor S7, a thyristor S8, an inductor L4, and a capacitor C2; The capacitor C2 is connected in parallel across both ends of the energy storage battery; The anode of the thyristor S7 is connected to the DC output terminal of the AC / DC module, and the cathode of the thyristor S7 is respectively connected to one end of the inductor L4 and the anode of the thyristor S8; the other end of the inductor L4 is connected to the positive electrode of the energy storage battery; the cathode of the thyristor S8 is connected to the negative electrode of the energy storage battery.

[0013] In a second aspect, the present application provides a biological lighting system, including an LED load and the dimmable LED power supply system according to any one of the first aspect, where the LED load includes a plurality of dimmable light-emitting diodes with different spectra; by adjusting the light intensity of each light-emitting diode and the light intensity ratio of the light-emitting diodes with different spectra, the adjustment of the light intensity and spectrum output by the biological lighting system is achieved.

[0014] In combination with the second aspect, further, the light-emitting diodes adopt a pluggable modular design structure, and a plurality of light-emitting diodes are connected in series or in parallel.

[0015] Compared with the prior art, the present application at least achieves the following beneficial effects: The dimmable LED power supply system provided by the present application can adjust the power supply mode of the LED load according to the collected grid connection electricity charges. For example: when the grid connection electricity charges are at the valley value of electricity consumption, the three-phase alternating current provided by the grid can be converted into direct current by the AC / DC module for the LED load to use, and at the same time, the energy storage battery can be charged through the bidirectional DC / DC module; when the grid connection electricity charges are at the peak value of electricity consumption, the connection between the power supply system and the grid can be disconnected, and the energy storage battery can be controlled to supply power to the LED load through the bidirectional DC / DC module, which can achieve the optimal use of electric energy, improve the utilization rate of the entire power grid, and reduce the user's electricity cost; The LED driving module includes a Boost sub-module and a PFC control sub-module. The PFC control sub-module can achieve power factor correction, enabling the circuit to utilize electrical energy more efficiently, reducing the adverse impact on the power grid. The Boost sub-module can boost the DC input voltage to the required output voltage to meet the operating requirements of the LED load. The PFC control sub-module can also detect and adjust the output current of the Boost sub-module, thereby adjusting the light intensity of the LED load; The biological lighting system provided by this application adopts the aforementioned adjustable-light LED power supply system. The LED load uses multiple light-emitting diodes with different spectra. By adjusting the light intensity of each light-emitting diode and the proportion of the light intensity of light-emitting diodes with different spectra through the LED driving module, the light intensity and spectrum output by the biological lighting system can be adjusted. Applying the biological lighting system provided by this application to the plant growth cultivation environment, the light intensity and spectrum of the LED load can be adjusted according to the optimal light demand environment required for plant growth. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic circuit diagram of an adjustable-light LED power supply system provided by an embodiment of this application; Figure 2 It is a circuit diagram of an LED driving module provided by an embodiment of this application; Figure 3 It is a schematic structural diagram of parallel connection of LED loads provided by an embodiment of this application; Figure 4 It is a schematic structural diagram of series connection of LED loads provided by an embodiment of this application. Detailed Description of the Embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, rather than all embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way limits this application and its application or use.

[0019] Embodiment 1:

[0020] This embodiment provides a dimmable LED power supply system, including a control module, an AC / DC module, a bidirectional DC / DC module, and a storage battery.

[0021] As Figure 1 shown, it is a schematic circuit diagram of the power supply system provided in this embodiment. The MCU in the figure can be regarded as the control module of this application. The MCU is respectively connected to the AC / DC module and the bidirectional DC / DC module in signal, and is used to control the working modes of the AC / DC module and the bidirectional DC / DC module according to the grid connection electricity cost.

[0022] The AC port of the AC / DC module can be connected to the power grid through a transformer. The DC port is respectively connected to the LED load and the first DC port of the bidirectional DC / DC module. The AC / DC module can, according to the control of the MCU, connect and disconnect the power supply system from the power grid, and when the power supply system is connected to the power grid, convert the three-phase alternating current provided by the power grid into direct current. On the one hand, this direct current can be used by the LED load, and on the other hand, it can be used for energy storage of the storage battery after voltage conversion by the bidirectional DC / DC module.

[0023] The second DC port of the bidirectional DC / DC module is connected to the storage battery, and can, according to the control of the MCU, when the power supply system is connected to the power grid, convert the direct current output by the AC / DC module and store it in the storage battery after voltage conversion; the first DC port of the bidirectional DC / DC module is simultaneously connected to the input end of the LED load, and is used to, when the power supply system is disconnected from the power grid, according to the control of the MCU, convert the direct current output by the storage battery and supply it to the LED load for use after voltage conversion.

[0024] As an embodiment, the aforementioned MCU can be connected to the network through a BMS system. The BMS system can adopt the Jinshengda biological supplementary lighting BMS system. This BMS system can automatically identify the current grid connection electricity cost, so that the MCU can obtain the current grid connection electricity cost through the BMS system. Of course, in addition to the BMS system, other systems can also be adopted, as long as they can identify the current grid connection electricity cost. If the current grid connection electricity cost is at the valley value of electricity consumption, the three-phase alternating current provided by the power grid can be converted into direct current by the AC / DC module and supplied to the LED load for use, and at the same time, the direct current output by the AC / DC module can be stored in the storage battery after voltage conversion by the bidirectional DC / DC module. If the current grid connection electricity cost is at the peak value of electricity consumption, the connection between the power supply system and the power grid can be disconnected through the AC / DC module, and the storage battery can be controlled to supply power to the LED load through the bidirectional DC / DC module, so as to achieve the optimal use of electric energy, improve the utilization rate of the entire power grid, and reduce the user's electricity cost.

[0025] In some embodiments, the dimmable LED power supply system provided by the present application further includes an LED driving module for realizing the light intensity adjustment of the LED load. As Figure 2 shown, it is the circuit diagram of the LED driving module provided in this embodiment, including a Boost sub-module and a PFC control sub-module. The PFC control sub-module can achieve power factor correction, enabling the circuit to utilize electric energy more efficiently, reducing the adverse effects on the power grid. The control signal output terminal of the PFC control sub-module is connected to the control terminal of the Boost sub-module. The Boost sub-module can raise the DC input voltage to the required output voltage to meet the working requirements of the LED load. During operation, the PFC control sub-module receives the DC input voltage signal provided by the AC / DC module, as well as the voltage feedback signal and current feedback signal at the output terminal of the Boost sub-module, and processes the DC input voltage signal and the feedback signals according to the internal preset logic to adjust the output current of the Boost sub-module, thereby adjusting the light intensity of the LED load.

[0026] Continue to refer to Figure 2 , the Boost sub-module includes a power inductor L101, a freewheeling diode D103, an output capacitor, and a power switch M101.

[0027] The output capacitor is connected in parallel across both ends of the LED load and can be composed of two capacitors C110 and C111 connected in series. The output capacitor can not only smooth the DC voltage signal and filter out high-frequency noise, but also play a certain buffering and absorption role when there is an instantaneous overvoltage or surge voltage in the circuit, protecting the LED load from being impacted by excessive voltage.

[0028] One end of the power inductor L101 is connected to the DC output terminal of the AC / DC module, and the other end is connected to one end of the output capacitor and one end of the LED load after being connected in series with the freewheeling diode D103; the other end of the output capacitor and the other end of the LED load are both grounded. The freewheeling diode D103 can ensure the unidirectional flow of current, ensuring that the electric energy released by the power inductor L101 can only flow to the LED load.

[0029] The power switch M101 can be a PNP power switch. Its drain is connected between the power inductor L101 and the freewheeling diode D103, its gate is connected to the control signal output terminal of the PFC control sub-module, and its source is grounded.

[0030] When the power switch M101 is turned on, the DC input voltage provided by the AC / DC module delivers electrical energy to the power inductor L101. The power inductor L101 converts the electrical energy into magnetic energy to achieve electrical energy storage. When the power switch M101 is turned off, the power inductor L101 releases electrical energy, that is, converts magnetic energy into electrical energy, and superimposes it on the DC input voltage provided by the AC / DC module. The current flows through the freewheeling diode D103 to the output capacitor and the LED load, so that the LED load obtains a stable DC voltage and current.

[0031] The PFC control sub-module can adjust the on and off time ratio of the power switch M101 to achieve the regulation of the output voltage and output current of the Boost sub-module. Since the light intensity of the LED load is proportional to the passing current, the light intensity of the LED load can be adjusted by adjusting the output voltage and output current of the Boost sub-module.

[0032] The PFC control sub-module, as a power factor correction module, can use the L6562 chip. The L6562 chip has 8 pins, and each pin has a specific function. Applying the L6562 chip to the LED driving circuit of the present application can effectively improve the power factor and reduce harmonic current to achieve the optimal use of electrical energy and improve the utilization rate of the entire power grid. The connection relationship and functions of each pin of the L6562 chip are described as follows: 1. The ZCD pin, that is, the zero current detection terminal, is connected to the detection winding. The current flowing through the power inductor L101 is detected by electromagnetic induction. When the current of the power inductor L101 passes through zero, the L6562 chip will trigger the power switch M101 to turn on, so that the circuit works in the critical conduction mode (CRM). Through this precise control, it can be ensured that the current of the power inductor L101 starts to rise from zero in each cycle, thereby reducing the loss of the power switch M101DE, improving the power factor, and reducing harmonic distortion. In the actual circuit design, an external circuit is set between the ZCD pin and the detection winding to sample and process the current signal detected by the detection winding. For example: in this embodiment, the ZCD pin is connected to the detection winding after being connected in series with the current limiting resistor R105. A series-connected resistor R61 and capacitor C19 are also connected in parallel across the two ends of the current limiting resistor R105, and the processed signal is input to the ZCD pin. The ZCD pin is also grounded after being connected in series with the capacitor C102.

[0033] 2. The COMP pin, that is, the compensation terminal, is grounded through the compensation network, which is used to optimize the performance of the internal error amplifier of the L6562 chip and ensure the stability and dynamic response ability of the circuit. The compensation network includes the capacitor C113 and the resistor R62 and capacitor C24 connected in series and connected in parallel across the two ends of the capacitor C113.

[0034] 3. The MULT pin, which is the input terminal of the multiplier, is connected to the DC output terminal of the AC / DC module through multiple resistors connected in series, and is used to sense the magnitude of the DC input voltage. The L6562 chip multiplies the DC input voltage signal by the output signal of the internal error amplifier to provide a reference signal for the current detection comparator, thereby controlling the on and off times of the power switch M101. In this embodiment, the MULT pin is grounded after being connected in series with the resistor R103, and a capacitor C103 is connected in parallel across both ends of the resistor R103. The MULT pin is also connected to the DC output terminal VDC of the AC / DC module after being connected in series with the resistors R115, R114, R113, and R112 in sequence.

[0035] 4. The GD pin, which is the drive output terminal, is electrically connected to the gate of the power switch M101, and outputs a drive signal to control the on and off of the power switch M101, thereby realizing the control of the Boost sub-module. In some embodiments, the PFC control sub-module includes a triode Q107, and the base of the triode Q107 is connected to the emitter after being connected in series with a diode D104; the GD pin is connected to the base of the triode Q107 after being connected in series with a resistor R107, the collector of the triode Q107 is grounded after being connected in series with a resistor R120, and the emitter is connected to the gate of the power switch after being connected in series with a resistor R170; the triode Q107 is used to amplify the drive signal output by the GD pin of the L6562 chip and provide a drive current for the gate of the power switch.

[0036] 5. The CS pin, which is the current detection terminal, is connected to the source of the power switch M101 after being connected in series with a resistor R104, and is also grounded through multiple parallel resistors. Among them, the parallel resistors include the resistors R121, R123, R124, and R125 connected in parallel. The resistor R104 and the parallel resistors are used to convert the current signal in the circuit into a voltage signal. When the overcurrent flowing through the power switch M101 occurs, the voltage signal collected by the CS pin exceeds the threshold set inside the L6562 chip, and the L6562 chip triggers the overcurrent protection mechanism to turn off the power switch. The CS pin is also grounded after being connected in series with a capacitor C104.

[0037] 6. The VCC pin, which is the power supply terminal, is connected to the DC voltage source after being connected in series with a current-limiting resistor R108. The current-limiting resistor R108 is used to limit the current flowing into the VCC pin, prevent the chip from being damaged due to overcurrent, and suppress the current mutation when the power supply voltage fluctuates, and provides a stable supply current for the L6562 chip. In this embodiment, the DC voltage source uses a 15V DC voltage source, and the VCC pin is also grounded after being connected in series with a capacitor C108.

[0038] 7. GND pin, i.e., the ground terminal, which is the reference ground of the L6562 chip and provides a zero-potential reference for the internal circuits of the L6562 chip.

[0039] 8. INV pin, i.e., the inverting input terminal, is used to receive the feedback signal of the output voltage of the AC / DC module and external control signals, and then compare them with the reference voltage set inside the L6562 chip to determine whether the output voltage is stable. If there is a deviation in the output voltage, the L6562 chip will adjust the control strategy.

[0040] Continue to refer to Figure 2 , in the embodiment, the DC voltage source is connected to the INV pin of the L6562 chip after being serially connected with a voltage-dividing resistor R132, diodes D101, and D105, and is used to provide a reference voltage for the L6562 chip. The voltage-dividing resistor R132 is used to divide the voltage of the DC voltage source so that the subsequent circuits can withstand an appropriate voltage and limit the current; the diodes D101 and D105 use the unidirectional conductivity to prevent the reverse flow of current and play a certain voltage-stabilizing role to provide a stable reference voltage for the INV pin; the anode of the diode D101 is connected to the collector of the triode Q101, the cathode of the diode D101 is grounded through the parallel-connected resistor R131 and capacitor C109, the emitter of the triode Q101 is grounded, and the base is connected to the MCU. The triode Q101 serves as an electronic switch and indirectly controls the voltage of the INV pin by turning on or off, thereby adjusting the working state of the L6562 chip. The specific analysis is as follows: According to the system control, the MCU can adjust the conduction and turn-off of the triode Q101 through PWM. When the triode Q101 is turned off, the current flows through the resistor R132 and the diode D101 to charge the capacitor C109. The resistor R131 in parallel integrates to produce an equivalent DC voltage, and then through the diode D105, it provides a DC bias to the INV pin of the L6562 chip, thereby changing the sampling value of the INV pin of the L6562 chip. The voltage of the COMP pin changes accordingly, and then the output of the multiplier is changed. Finally, it affects the reference signal compared with the sampling value of the CS pin, changes the output pulse width of the GD pin, and achieves the purpose of controlling the overall output current size of the LED drive circuit and adjusting the output state. In addition, the resistor R131 and the capacitor C109 can also play a role in soft start to prevent overshoot during circuit startup. When the triode Q101 is conducting, the current flowing through the resistor R132 from the 15V DC voltage source is short-circuited to the reference ground. The current flows through the resistor R132 and the diode D101 to charge the capacitor C109. The resistor R131 in parallel integrates to produce an equivalent DC voltage, and then through the diode D105, it provides a DC bias to the INV pin of the L6562 chip, linearly and gradually reducing the voltage of the INV pin from 2.5V (the reference voltage inside the L6562 chip), so that the pulse width of the GD pin of the L6562 chip gradually increases from the minimum to the required value to achieve the effect of current soft start.

[0041] The DC output terminal VDC of the AC / DC module is grounded after being connected in series with the diode D102, a voltage dividing network, and the resistor R101. The voltage dividing network includes the resistors R126, R127, R128, R129, and R130 connected in series. The INV pin is connected to the electrical connection point of the voltage dividing network and the resistor R101 through a wire. The L6562 chip detects the voltage of this voltage dividing point through the INV pin to obtain the output voltage of the AC / DC module after being isolated by the diode D102 and divided by the voltage dividing network, so as to adjust the Boost sub-module in advance to adapt to the change of the DC output voltage of the AC / DC module and ensure the stable light intensity of the LED load.

[0042] Embodiment 2:

[0043] This embodiment provides an adjustable-light LED power supply system, which at least includes a control module, an AC / DC module, a bidirectional DC / DC module, and a storage battery. Among them, the control module and the storage battery can both adopt the same circuit structure as in Embodiment 1. It should be noted that the LED drive module described in Embodiment 1, as the main part for adjusting the light intensity of the LED load, is not an essential module. For example, when the LED load is applied to an environment where light intensity adjustment is not required, the direct current output by the AC / DC module and the direct current reversely output by the bidirectional DC / DC module through the storage battery can be directly used to supply the LED load.

[0044] Compared with the first embodiment, this embodiment provides an implementable circuit structure for the AC / DC module and the bidirectional DC / DC module.

[0045] See Figure 1 , the AC / DC module provided in this embodiment can adopt a three-phase fully controlled rectifier bridge composed of six thyristors S1, S2, S3, S4, S5, and S6. Specifically, the six thyristors can be divided into two groups, with three thyristors in each group. The cathodes of the first group of thyristors S1, S3, and S5 are respectively connected to the three outgoing terminals of the secondary winding of the transformer, and their anodes are connected together to form an output terminal of the rectifier bridge. The anodes of the second group of thyristors S2, S4, and S6 are respectively connected to the three outgoing terminals of the secondary winding of the transformer, and their cathodes are connected together to form another output terminal of the rectifier bridge. By controlling the triggering pulse moments (i.e., the firing angles) of each thyristor, the conduction time of the thyristor can be controlled, and thus the magnitude of the output DC voltage can be adjusted. When the firing angle changes, the thyristor conducts at different moments of the AC voltage, causing the average value of the output DC voltage to change.

[0046] In this embodiment, the bidirectional DC / DC module includes a thyristor S7, a thyristor S8, an inductor L4, and a capacitor C2. The capacitor C2 is connected in parallel across the two ends of the energy storage battery, playing a role in filtering and stabilizing the voltage. The anode of the thyristor S7 is connected to the DC output terminal (positive pole) of the AC / DC module, and the cathode of the thyristor S7 is respectively connected to one end of the inductor L4 and the anode of the thyristor S8; the other end of the inductor L4 is connected to the positive pole of the energy storage battery; the cathode of the thyristor S8 is connected to the negative pole of the energy storage battery.

[0047] The following conducts a detailed analysis of the working modes of the bidirectional DC / DC module: Charging mode: That is, the AC / DC module charges the energy storage battery through the bidirectional DC / DC module. At this time, the AC / DC module outputs a DC voltage, and the thyristor S8 is in the off state: When the thyristor S7 receives a trigger signal and conducts, the current flows out from the DC output terminal of the AC / DC module, flows into the anode of the thyristor S7 and out of the cathode, and the inductor L4 is charged.

[0048] When the thyristor S7 switches to the off state, the inductor L4 maintains the current through its own induced electromotive force, and the inductor L4 releases energy to charge the energy storage battery.

[0049] Discharging mode: That is, the energy storage battery supplies power to the LED load through the bidirectional DC / DC module. At this time, the AC / DC module disconnects the power supply system from the power grid, the thyristor S7 is in the off state, and the energy storage battery provides electrical energy: After the thyristor S8 receives the trigger signal and conducts, the current flows out from the positive electrode of the energy storage battery, through the inductor L4, into the anode of the thyristor S8, and out of the cathode and back to the negative electrode of the energy storage battery. The inductor L4 stores energy and the current gradually increases.

[0050] When the thyristor S8 switches to the off state, the energy stored in the inductor L4 generates an induced electromotive force. A diode is connected in parallel between the cathode and anode of the thyristor S7. The inductor L4 releases energy, and the current supplies power to the LED driving module after passing through the inductor L4 and the diode connected in parallel between the cathode and anode of the thyristor S7.

[0051] The adjustable - light LED power supply system provided in this embodiment is configured with an AC / DC module and a bidirectional DC / DC module, and can switch the working modes of the two modules according to the control of the MCU to realize the energy storage and energy release of the energy storage battery. Specifically, when the grid - connected electricity charge is at the valley value of electricity consumption, the LED load is powered by the AC / DC module, and the energy storage battery is powered by the bidirectional DC / DC module; when the grid - connected electricity charge is at the peak value of electricity consumption, the energy storage battery supplies power to the LED load through the bidirectional DC / DC module, thereby reducing the energy consumption at the peak of electricity consumption, achieving the optimal use of electric energy, improving the utilization rate of the entire power grid, and reducing the electricity cost of users.

[0052] Embodiment Three:

[0053] This embodiment provides a biological lighting system, which includes an LED load and an adjustable - light LED power supply system for powering the LED load. The circuit structure described in Embodiment One or Embodiment Two can be adopted for this power supply system.

[0054] The LED load may include a plurality of light - emitting diodes with different spectra. By adjusting the light intensity of each light - emitting diode and the proportion of the light intensity of light - emitting diodes with different spectra, the light intensity and spectrum output by the biological lighting system can be adjusted to meet the requirements of biological growth for the lighting environment.

[0055] In this embodiment, the aforementioned light - emitting diodes may include full - spectrum light - emitting diodes (i.e., FR light - emitting diodes) and RGB light - emitting diodes.

[0056] A full - spectrum light - emitting diode is a light - emitting diode that can emit light in a relatively wide spectral range or has good response characteristics to light of different wavelengths. It can emit a continuous and relatively uniform spectrum, including multiple wavelength ranges from ultraviolet to infrared. By adjusting the intensity ratio of light of different wavelengths, various color and color temperature changes can be achieved.

[0057] Both RGB light-emitting diodes and FR light-emitting diodes are light-emitting diodes that can emit three primary colors of light: red, green, and blue. They usually integrate three independent light-emitting chips inside, corresponding to the three colors of red, green, and blue respectively. By controlling the light-emitting intensity of these three chips, various different colors can be mixed.

[0058] For multiple light-emitting diodes, during actual control, the current of the light-emitting diodes in each channel can be independently controlled, thereby controlling the light-emitting intensity of different-color light-emitting diodes. For example, to achieve warm white light, the current of the red light-emitting diodes can be increased, while appropriately reducing the current of the blue and green light-emitting diodes; to achieve cold white light, the current of the blue and green light-emitting diodes is increased, and the current of the red light-emitting diodes is reduced. By precisely adjusting the light intensity ratio of different-color light-emitting diodes, the adjustment of the mixed light spectrum can be realized, achieving the effect of changing the light-emitting color. In this embodiment, the spectrum can be adjusted in two modes: one is to adjust by controlling the light emission of different numbers of LED beads of different colors, and the other is to adjust the current magnitude of the LED beads of different colors to adjust the spectrum in the state of the former.

[0059] As an embodiment of this application, the light-emitting diode can adopt a pluggable modular design structure, and the replacement of the light-emitting diode can be realized by plugging. Multiple light-emitting diodes can be connected in parallel or in series.

[0060] As Figure 3 shown, multiple light-emitting diodes in the LED load are connected in parallel, and each light-emitting diode is equipped with its own LED driving module as described in Embodiment 1. When adjusting the light intensity and spectrum, the current of each light-emitting diode can be adjusted through the LED driving module, thereby realizing the adjustment of the overall output light intensity and spectrum of the LED load.

[0061] As Figure 4 shown, as Figure 3 a replacement, multiple light-emitting diodes in the LED load can also be connected in series. It should be noted that when connected in series, each light-emitting diode does not need to be equipped with the LED driving module described in Embodiment 1. The number of light-emitting diodes with different light intensities and different spectra in the LED load can be changed by plugging, so as to achieve the purpose of changing the overall output light intensity and spectrum of the LED load.

[0062] As an embodiment of the present application, temperature protection and overcurrent protection can also be configured for the LED load. Specifically, the temperature signal of the light-emitting diode collected by the temperature sensor can be sent to the MCU through a digital signal, and the MCU adjusts the output state of the bidirectional DC / DC terminal according to this digital signal. For the light-emitting diodes connected in parallel, the current of the resistors R120-R125 in the LED driving module can be collected and fed back to the MCU, and the MCU analyzes and judges to control the current output to the LED load.

[0063] In the biological lighting system provided by this embodiment, the LED load uses a plurality of light-emitting diodes with different spectra. By adjusting the light intensity of each light-emitting diode and the light intensity ratio of the light-emitting diodes with different spectra, the light intensity and spectrum output by the biological lighting system can be adjusted. Applying the biological lighting system provided by the present application to the plant growth cultivation environment, the light intensity and spectrum of the LED load can be adjusted according to the optimal light demand environment required for plant growth.

[0064] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present application.

Claims

1. An adjustable light - emitting diode (LED) power supply system, characterized in that, It includes a control module, an AC / DC module, a bidirectional DC / DC module, and a storage battery; The control module is used to control the working modes of the AC / DC module and the bidirectional DC / DC module according to the obtained grid connection electricity charge; The AC / DC module is used to connect and disconnect the power supply system from the power grid according to the control of the control module, and when the power supply system is connected to the power grid, it converts the three-phase alternating current provided by the power grid into direct current for the LED load and the storage battery to store energy; The bidirectional DC / DC module is used to, according to the control of the control module, when the power supply system is connected to the power grid, convert the direct current output by the AC / DC module and store it in the storage battery after voltage conversion; and when the power supply system is disconnected from the power grid, convert the direct current output by the storage battery after voltage conversion for the LED load to use.

2. The dimmable LED power supply system according to claim 1, wherein It further includes an LED driving module, the LED driving module includes a Boost sub-module and a PFC control sub-module, the control signal output end of the PFC control sub-module is connected to the control end of the Boost sub-module, the PFC control sub-module receives the DC input voltage signal provided by the AC / DC module, as well as the voltage feedback signal and current feedback signal at the output end of the Boost sub-module, and processes the DC input voltage signal and the feedback signals according to the internal preset logic to adjust the output current of the Boost sub-module, thereby adjusting the light intensity of the LED load; Wherein, the Boost sub-module includes a power inductor, a freewheeling diode D103, an output capacitor, and a power switch tube; The output capacitor is connected in parallel across both ends of the LED load; One end of the power inductor is connected to the DC output end of the AC / DC module, and the other end is connected to one end of the output capacitor and one end of the LED load after being connected in series with the freewheeling diode D103; the other end of the output capacitor and the other end of the LED load are both grounded; The drain of the power switch tube is connected between the power inductor and the freewheeling diode D103, the gate is connected to the control signal output end of the PFC control sub-module, and the source is grounded; The PFC control sub-module adjusts the on-time and off-time ratio of the power switch tube to realize the adjustment of the output voltage and output current of the Boost sub-module, and further adjusts the light intensity of the LED load.

3. The dimmable LED power supply system according to claim 2, wherein The PFC control sub-module includes an L6562 chip; The GD pin of the L6562 chip is electrically connected to the gate of the power switch tube; The ZCD pin of the L6562 chip is connected to a detection winding to detect the current flowing through the power inductor. When the current flowing through the power inductor is zero, the L6562 chip triggers the power switch tube to conduct, so that the circuit works in the critical conduction mode; The MULT pin of the L6562 chip is connected to the DC output end of the AC / DC module in series after being connected in series with a resistor, and is used for sampling the DC input voltage; The multiplier inside the L6562 chip multiplies the collected DC input voltage by the output signal of the error amplifier inside the L6562 chip to obtain a reference current signal, so as to control the on and off time of the power switch tube in the Boost sub-module.

4. The dimmable LED power supply system according to claim 3, wherein The CS pin of the L6562 chip is connected to the source electrode of the power switch tube after being serially connected with a resistor R104, and is also grounded through multiple parallel resistors; The resistor R104 and the parallel resistors are used to convert the current signal in the circuit into a voltage signal. When an overcurrent flows through the power switch tube, the voltage signal collected by the CS pin exceeds the threshold set inside the L6562 chip, and the L6562 chip triggers an overcurrent protection mechanism to turn off the power switch tube.

5. The dimmable LED power supply system according to claim 3, wherein The PFC control sub-module further includes a triode Q107, and the base of the triode Q107 is connected to the emitter after being serially connected with a diode D104; The GD pin of the L6562 chip is connected to the base of the triode Q107 after being serially connected with a resistor R107. The collector of the triode Q107 is grounded after being serially connected with a resistor R120, and the emitter is connected to the gate of the power switch tube after being serially connected with a resistor R170; The triode Q107 is used to amplify the driving signal output by the GD pin of the L6562 chip to provide a driving current for the gate of the power switch tube.

6. The dimmable LED power supply system according to claim 3, characterized in that, The VCC pin of the L6562 chip is connected to a DC voltage source after being serially connected with a current-limiting resistor R108; The DC voltage source is connected to the INV pin of the L6562 chip after being serially connected with voltage-dividing resistors R132, diodes D101, and D105, for providing a reference voltage for the L6562 chip; The anode of the diode D101 is connected to the collector of the triode Q101. The emitter of the triode Q101 is grounded, and the base is connected to the control module; the cathode of the diode D101 is also grounded through a parallel-connected resistor R131 and a capacitor C109; The DC output terminal of the AC / DC module is grounded after being serially connected with a diode D102, a voltage-dividing network, and a resistor R101; The INV pin is connected to the electrical connection point of the voltage-dividing network and the resistor R101.

7. The dimmable LED power supply system according to claim 3, characterized in that The COMP pin of the L6562 chip is grounded through a compensation network, and the compensation network includes a capacitor C113 and resistors R62 and C24 that are connected in parallel across the capacitor C113 and are serially connected; 8. The dimmable LED power supply system according to claim 1, characterized in that, The AC / DC module employs a three-phase fully controlled rectifier bridge composed of six thyristors; The bidirectional DC / DC module includes thyristors S7, S8, an inductor L4, and a capacitor C2; The capacitor C2 is connected in parallel across both ends of the energy storage battery; The anode of the thyristor S7 is connected to the DC output terminal of the AC / DC module. The cathode of the thyristor S7 is respectively connected to one end of the inductor L4 and the anode of the thyristor S8; the other end of the inductor L4 is connected to the positive electrode of the energy storage battery; the cathode of the thyristor S8 is connected to the negative electrode of the energy storage battery.

9. A biological lighting system, characterized in that, Comprising an LED load and the dimmable LED power supply system according to any one of claims 1 to 8, the LED load includes a plurality of dimmable light-emitting diodes with different spectra; by adjusting the light intensity of each light-emitting diode and the light intensity ratio of the light-emitting diodes with different spectra, the adjustment of the light intensity and spectrum output by the biological lighting system is achieved.

10. The bioluminescence system according to claim 9, wherein The light-emitting diodes adopt a pluggable modular design structure, and a plurality of light-emitting diodes are connected in series or in parallel.

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