Novel intelligent street lamp power supply circuit and street lamp system

Abstract

The utility model relates to the technical field of power electronics, and mainly provides a novel intelligent street lamp power supply circuit and a street lamp system, the circuit comprises a boost module, a step-down module and an output module; the boost module is connected with the step-down module, the boost module is also used for being connected with a power supply, the step-down module is connected with the output module, the step-down module is also used for being connected with a controller, and the output module is used for being connected with an LED lamp. The boost module is used for boosting first voltage output by a power supply to second voltage and inputting the second voltage to the buck module. The voltage reduction module is used for receiving a dimming signal / single pulse current of the controller and outputting a first pulse signal with a preset duty ratio based on the dimming signal / single pulse current so as to output a preset voltage to the output module; the output module is used for supplying power to the LED lamp according to the preset voltage. On the basis, the first voltage of the power supply is boosted through the boosting module, so that when the first voltage is small, the power supply requirement of the street lamp system can still be met, and the utilization rate of energy is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of power electronics, and in particular to a novel intelligent street lamp power supply circuit and a street lamp system. [Background technology]

[0002] In the field of urban road lighting, traditional street lighting systems have long faced many thorny problems. On the one hand, their low energy efficiency has caused serious waste of resources and greatly increased the city's energy consumption and operating costs. On the other hand, the management method is simple and extensive, relying only on a single means, and cannot achieve flexible and effective regulation.

[0003] At the same time, the traditional street lamp system is seriously insufficient in information technology, and it is difficult to keep up with the needs of modern urban development for intelligent and refined management. More importantly, there is a lack of active fault alarm mechanism. Often, after a street lamp fails, problems can only be discovered through manual inspections or citizen feedback, which leads to untimely maintenance and seriously affects the normal operation and safety of road lighting. Therefore, in order to improve the performance of the street lamp system, it is necessary to provide a new type of intelligent street lamp power supply circuit. [Contents of the utility model]

[0004] The implementation mode of the utility model provides a novel intelligent street lamp power supply circuit and a street lamp system, aiming to solve the technical problems of high energy waste rate and low intelligence of the street lamp system in the prior art.

[0005] In order to solve the above technical problems, a technical solution adopted by the embodiment of the utility model is: providing a new intelligent street lamp power supply circuit, the new intelligent street lamp power supply circuit includes a boost module, a buck module and an output module;

[0006] The boost module is connected to the buck module, the boost module is also used to connect to a power source, the buck module is connected to the output module, the buck module is also used to connect to a controller, and the output module is used to connect to an LED lamp;

[0007] The boost module is used to receive the first voltage output by the power supply, and boost the first voltage to a second voltage and then input it into the buck module, so that the buck module starts to work based on the second voltage;

[0008] The step-down module is used to receive the dimming signal output by the controller during operation, output a first pulse signal with a preset duty cycle based on the dimming signal, and adjust the second voltage according to the first pulse signal with the preset duty cycle to output a preset voltage to the output module; or

[0009] Acquire a single pulse current during operation, output a first pulse signal with a preset duty cycle based on the single pulse current, and adjust the second voltage according to the first pulse signal with the preset duty cycle to output a preset voltage to the output module;

[0010] The output module is used to receive the preset voltage and output the preset voltage to the LED lamp to power the LED lamp.

[0011] Optionally, the boost module includes a control unit, a detection unit and a boost unit;

[0012] The control unit is connected to the power supply and the detection unit respectively, the detection unit is connected to the boost unit, and the boost unit is connected to the power supply and the buck module respectively;

[0013] The control unit is used to output a second pulse signal to the boost unit according to the first voltage, so that the boost unit starts charging and discharging according to the second pulse signal, thereby boosting the first voltage to a second voltage;

[0014] The detection unit is used to detect the current and voltage of the boost unit during the charging and discharging process of the boost unit, and adjust the duty cycle of the second pulse signal according to the current and voltage so that the voltage output by the boost unit is the second voltage.

[0015] Optionally, the control unit includes a chip IC3, a resistor R24, a diode D4, a resistor R25 and a capacitor EC4;

[0016] The high-voltage start pin of the chip IC3 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the power supply through the resistor R24, the power supply pin of the chip IC3 is connected to the capacitor EC4, and the capacitor EC4 is also connected to the power supply voltage through the resistor R25, the feedback pin and the protection pin of the chip IC3 are connected to the detection unit, and the drive pin of the chip IC3 is connected to the boost unit.

[0017] Optionally, the boost unit includes a power tube Q1, a resistor R46, a resistor R47, a resistor R47A, a resistor R14, a diode D5, a transistor Q2, an inductor L2A, an inductor L3 and an inductor L3A;

[0018] The first end of the resistor R46 is connected to the driving pin of the chip IC3, the second end of the resistor R46 is connected to the gate of the power tube Q1 through the diode D5, the gate of the power tube Q1 is also connected to the source of the power tube Q1 through the resistor R47A, the source of the power tube Q1 is grounded through the resistor R14, the drain of the power tube Q1 is connected to the inductor L2A through the inductor L3, the inductor L3A is connected in parallel with the inductor L3, the inductor L2A is connected to the power supply, the resistor R46 is also connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the gate of the power tube Q1 through the resistor R47, and the collector of the transistor Q2 is grounded through the resistor R14.

[0019] Optionally, the voltage reduction module includes a dimming unit and a voltage reduction unit;

[0020] The dimming unit is connected to the boost module and the buck unit respectively, the dimming unit is also connected to a controller, and the buck unit is also connected to the boost module;

[0021] The dimming unit is used to receive a dimming signal during operation, and output a first pulse signal with a preset duty cycle to the buck unit based on the dimming signal, so that the buck unit determines the on-time according to the first pulse signal, thereby adjusting the second voltage to a preset voltage; or

[0022] A single pulse current is received, and a first pulse signal with a preset duty cycle is output to the buck unit according to the single pulse current to control the on and off of the buck unit, thereby outputting a preset voltage to the output module.

[0023] Optionally, the dimming unit includes a chip IC2, a resistor R33, a resistor R25A, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45, a resistor R55, a diode D8, a voltage regulator Z1, a voltage regulator Z5, a transistor Q4, a capacitor C13, a capacitor C12 and a capacitor C15;

[0024] The high voltage start pin of the chip IC2 is connected to the boost module through the resistor R33, the power supply pin of the chip IC2 is connected to the emitter of the transistor Q4, the feedback pin of the chip IC2 is grounded through the resistor R43, the resistor R42 and the capacitor C12 are connected in parallel with the resistor R43, the feedback pin of the chip IC2 is also connected to the anode of the diode D8 through the resistor R41 and the resistor R44, the cathode of the diode D8 is grounded through the capacitor C13, and the cathode of the diode D8 is also connected to the collector of the transistor Q4. The collector of the transistor Q4 is also connected to the base of the transistor Q4 through the resistor R45, the base of the transistor Q4 is also connected to the cathode of the voltage regulator Z1, the anode of the voltage regulator Z1 is grounded, the emitter of the transistor Q4 is connected to the resistor R55, the resistor R55 is connected to the cathode of the voltage regulator Z5, the anode of the voltage regulator Z5 is grounded, the resistor R55 is also connected to the dimming pin of the chip IC2, the dimming pin of the chip IC2 is also connected to the controller, and the driving pin of the chip IC2 is connected to the buck unit.

[0025] Optionally, the step-down unit includes a chip Q6, a resistor R34, a resistor R35, a resistor R35A, a resistor R37, a capacitor C11, a voltage regulator tube Z2, an inductor L4, an inductor L4A and a transformer TR1;

[0026] The driving end of the chip Q6 is connected to the driving pin of the chip IC2 through the resistor R35 and the resistor R34, the capacitor C11 is connected to the resistor R34 and the driving end of the chip Q6 respectively, the capacitor C11 is also connected to the cathode of the voltage regulator tube Z2, the anode of the voltage regulator tube Z2 is connected to the dimming end of the chip Q6, the source of the chip Q6 is connected to the resistor R35 through the resistor R35A, the source of the chip Q6 is also grounded through the resistor R37, the drain of the chip Q6 is connected to the fourth pin of the transformer TR1 through the inductor L4, the inductor L4A is connected in parallel with the inductor L4, the fifth pin of the transformer TR1 is connected to the boost module, and the eighth pin and the tenth pin of the transformer TR1 are respectively connected to the output module.

[0027] Optionally, the novel intelligent street lamp power supply circuit further includes an anti-lightning processing module;

[0028] The lightning protection processing module is connected to the power supply and the boost module respectively.

[0029] Optionally, the novel intelligent street lamp power supply circuit further includes an undervoltage protection module;

[0030] The undervoltage protection module is connected to the boost module and the buck module respectively;

[0031] The undervoltage protection module is used to detect the second voltage, and when the second voltage is lower than a threshold voltage, control the voltage reduction module to stop outputting the pulse signal.

[0032] In order to solve the above technical problems, another technical solution adopted by the embodiment of the utility model is: to provide a street lamp system, characterized in that the street lamp system comprises:

[0033] Controller;

[0034] power supply;

[0035] LED lights; and

[0036] The novel intelligent street lamp power supply circuit as described above.

[0037] Different from the related art, the utility model provides a new intelligent street lamp power supply circuit and street lamp system, wherein the new intelligent street lamp power supply circuit comprises a boost module, a buck module and an output module; the boost module is connected to the buck module, and the boost module is also used to be connected to a power supply, the buck module is connected to the output module, and the buck module is also used to be connected to a controller, and the output module is used to be connected to an LED lamp. The boost module is used to receive the first voltage output by the power supply, and boost the first voltage to a second voltage and then input it into the buck module, so that the buck module starts to work based on the second voltage; the buck module is used to receive the dimming signal output by the controller during operation, output a first pulse signal with a preset duty cycle based on the dimming signal, and adjust the second voltage according to the first pulse signal with the preset duty cycle, so as to output the preset voltage to the output module; or obtain a single pulse current during operation, output a first pulse signal with a preset duty cycle based on the single pulse current, and adjust the second voltage according to the first pulse signal with the preset duty cycle, so as to output the preset voltage to the output module; the output module is used to receive the preset voltage and output the preset voltage to the LED lamp to power the LED lamp. Based on this, by setting the boost module, the buck module and the output module to work together, the input power supply voltage can be flexibly adjusted and accurately controlled, thereby improving the intelligence of the street lamp system, and the first voltage of the power supply is boosted by the boost module, so that when the first voltage is small, it can still meet the power supply demand of the street lamp system, thereby improving the energy utilization rate.

Brief Description of the Drawings

[0038] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0039] Figure 1 This is a structural block diagram of a street lamp system provided by an embodiment of the utility model;

[0040] Figure 2 This is a structural block diagram of a novel intelligent street lamp power supply circuit provided by an embodiment of the utility model;

[0041] Figure 3 It is a circuit diagram of a boost module provided by an embodiment of the utility model;

[0042] Figure 4 It is a circuit diagram of a step-down module provided by an embodiment of the utility model;

[0043] Figure 5 is a circuit diagram of a controller provided by an embodiment of the utility model;

[0044] Figure 6 It is a circuit diagram of an undervoltage protection module provided by an embodiment of the utility model;

[0045] Figure 7 It is a circuit diagram of a lightning protection processing module provided by an embodiment of the utility model;

[0046] Figure 8 It is a circuit diagram of an output module provided in an embodiment of the utility model. [Specific implementation method]

[0047] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0048] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0049] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0050] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0051] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0052] See also Figure 1 , Figure 1 is a structural block diagram of a street lamp system provided by an embodiment of the utility model, such as Figure 1 As shown, the street lamp system 100 includes a controller 10, a power supply 20, an LED lamp 30 and a new intelligent street lamp power supply circuit 40, wherein the new intelligent street lamp power supply circuit 40 is connected to the controller 10, the power supply 20 and the LED lamp 30 respectively. Specifically, the new intelligent street lamp power supply circuit 40 communicates remotely with the controller 10, and the new intelligent street lamp power supply circuit 40 works according to the control instructions sent by the controller 10, and feeds back the working data to the controller 10 in real time during the working process, so as to realize the refined management of the street lamp system 100. During the working process of the street lamp system 100, the new intelligent street lamp power supply circuit 40 receives the first voltage input by the power supply 20, and processes the first voltage based on the signal input by the controller 10, thereby outputting a preset voltage to the LED lamp 30, so that the LED lamp 30 works based on the preset voltage.

[0053] In some embodiments, the power source 20 can be a power grid or a storage power source. When the power source 20 is a power grid, the street light system 100 is powered by the power grid and starts to realize the lighting function when the power is supplied; when the power source 20 is a storage power source, when the light is sufficient, the solar photovoltaic panel in the storage power source will convert the solar energy into electric energy and store it in the internal battery, so that when insufficient light conditions are detected, the stored electric energy can be obtained to supply power, thereby realizing the lighting function.

[0054] In another embodiment, the controller 10 may be a PLC (Programmable Logic Controller), which uses a programmable memory to store instructions for performing logic operations, sequence control, timing, counting, arithmetic operations, etc. When the controller 10 communicates with the novel intelligent street lamp power supply circuit 40, it mainly utilizes the existing power line to transmit analog or digital signals at high speed through carrier waves, so that communication can be achieved without re-building a new network.

[0055] For further information, see Figure 2 , Figure 2 This is a structural block diagram of a novel intelligent street lamp power supply circuit provided by the embodiment of the utility model. Figure 2 As shown, the novel intelligent street lamp power supply circuit 40 includes a boost module 41, a buck module 42 and an output module 43;

[0056] The boost module 41 is connected to the buck module 42, the boost module 41 is used to connect to the power supply 20, the buck module 42 is connected to the output module 43, the buck module 42 is also used to connect to the controller 10, and the output module 43 is used to connect to the LED lamp 30;

[0057] The boost module 41 is used to receive the first voltage output by the power source 20, and boost the first voltage to a second voltage and then input it to the step-down module 42, so that the step-down module 42 starts to work based on the second voltage;

[0058] The step-down module 42 is used to receive the dimming signal output by the controller 10 during operation, output a first pulse signal with a preset duty cycle based on the dimming signal, and adjust the second voltage according to the first pulse signal with the preset duty cycle to output the preset voltage to the output module 43; or

[0059] Acquire a single pulse current during operation, output a first pulse signal with a preset duty cycle based on the single pulse current, and adjust the second voltage according to the first pulse signal with the preset duty cycle to output a preset voltage to the output module 43;

[0060] The output module 43 is used to receive the preset voltage and output the preset voltage to the LED lamp 30 to provide power to the LED lamp 30 .

[0061] Specifically, when the road lighting system 100 needs to start working, the power supply 20 will output a first voltage to the boost module 41. After receiving the first voltage, the boost module 41 will start working based on the first voltage, and during the working process, the first voltage will be boosted to increase the first voltage to a second voltage, and finally the second voltage will be output to the step-down module 42. It should be noted that the voltage output by the power supply 20 is boosted by the boost module 41, so that when the output voltage of the power supply 20 is relatively low, the power supply demand of the street lighting system 100 can still be met, thereby improving the utilization rate of energy.

[0062] When the boost module 41 outputs the second voltage, the buck module 42 will start working based on the second voltage. When the buck module 42 starts working, the buck module 42 will determine the dimming mode, wherein the dimming mode includes PWM dimming and 0-10V dimming. When the dimming mode is PWM dimming, the buck module 42 will receive the dimming signal output by the controller 10, and adjust the second voltage to a preset voltage based on the dimming signal, so that the LED lamp starts working based on the preset voltage. When the dimming mode is 0-10V dimming, the buck module 42 will receive a single pulse current, and output a first pulse signal with a preset duty cycle based on the single pulse current, so that the output voltage is the preset voltage.

[0063] Further, such as Figure 2 As shown, the boost module 41 includes a control unit 411, a detection unit 412 and a boost unit 413;

[0064] The control unit 411 is connected to the power supply 20 and the detection unit 412 respectively, the detection unit 412 is connected to the boost unit 413, and the boost unit 413 is connected to the power supply 20 and the buck module 42 respectively;

[0065] The control unit 411 is used to output a second pulse signal to the boost unit 413 according to the first voltage, so that the boost unit 413 starts charging and discharging according to the second pulse signal, thereby boosting the first voltage to a second voltage;

[0066] The detection unit 412 is used to detect the current and voltage of the boost unit 413 during the charging and discharging process of the boost unit 413, and adjust the duty cycle of the second pulse signal according to the current and voltage so that the voltage output by the boost unit 413 is the second voltage.

[0067] In some embodiments, see Figure 3 , Figure 3 is a circuit diagram of a boost module provided by an embodiment of the utility model, such as Figure 3 As shown, the control unit 411 includes a chip IC3, a resistor R24, a diode D4, a resistor R25 and a capacitor EC4;

[0068] The high-voltage startup pin of the chip IC3 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the power supply 20 through the resistor R24, the power supply pin of the chip IC3 is connected to the capacitor EC4, and the capacitor EC4 is also connected to the power supply voltage through the resistor R25, the feedback pin and the protection pin of the chip IC3 are connected to the detection unit 412, and the drive pin of the chip IC3 is connected to the boost unit 413.

[0069] The boost unit 413 includes a power tube Q1, a resistor R46, a resistor R47, a resistor R47A, a resistor R14, a diode D5, a transistor Q2, an inductor L2A, an inductor L3 and an inductor L3A;

[0070] The first end of the resistor R46 is connected to the driving pin of the chip IC3, the second end of the resistor R46 is connected to the gate of the power tube Q1 through the diode D5, the gate of the power tube Q1 is also connected to the source of the power tube Q1 through the resistor R47A, the source of the power tube Q1 is grounded through the resistor R14, the drain of the power tube Q1 is connected to the inductor L2A through the inductor L3, the inductor L3A is connected in parallel with the inductor L3, the inductor L2A is connected to the power supply 20, the resistor R46 is also connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the gate of the power tube Q1 through the resistor R47, and the collector of the transistor Q2 is grounded through the resistor R14.

[0071] The detection unit 413 includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C25 and a capacitor C26;

[0072] The resistor R8 is connected to the drain of the power tube Q1, the resistor R8, the resistor R9 and the resistor R10 are connected in series, the capacitor C3 is connected to the drain of the power tube Q1 and the resistor R10 respectively, the resistor R10 is connected to the protection pin (CS / ZCD) of the chip IC3 through the resistor R12, the resistor R10 is also grounded through the resistor R11 and the resistor R13, and the capacitor C4 and the capacitor C5 are connected in parallel with the resistor R11.

[0073] In some embodiments, the boost module 41 further includes an energy storage unit 414 (not shown), and the energy storage unit 414 is used to store the boosted voltage. Figure 3 As shown, the energy storage unit 414 includes capacitor EC1, capacitor EC2, capacitor EC3 and capacitor EC9, wherein the first end of the capacitor EC1 is connected to the output end of the boost unit 413, the second end of the capacitor EC2 is used for grounding, and the capacitor EC2, capacitor EC3 and capacitor EC9 are all connected in parallel with the capacitor EC1.

[0074] Specifically, after the power supply 20 outputs the first voltage, the first voltage is input to the high voltage start pin (HVDD) of the chip IC3 through the resistor R24 ​​and the diode D4, so that the chip IC3 is started. After the chip IC3 is started, the driving pin of the chip IC3 starts to output the second pulse signal; at the same time, the chip IC3 switches to the power supply pin (VDD) to start power supply, wherein the capacitor EC4 is the power supply capacitor of the chip IC3, which mainly stores the voltage output by VCC and inputs the voltage to the power supply pin of the chip IC3 to power the chip IC3. After the second pulse signal is output to the power tube Q1, the power tube Q1 starts to work based on the duty cycle of the second pulse signal (that is, it is turned on when the pulse signal is high and turned off when the pulse signal is low). When the power tube Q1 is turned on, the first voltage, the inductor L2A, the power tube Q1 and the ground terminal form a loop, so that the inductor L2A starts to store energy; when the power tube Q1 is turned off, the inductor L2A starts to discharge, so that the capacitors EC1, EC2, EC3 and EC9 start to charge based on the discharge voltage, thereby obtaining the second voltage. Preferably, as Figure 3 As shown, the second voltage is 400V.

[0075] Among them, when the power tube Q1 is turned on, on the one hand, the protection pin of the chip IC3 will detect the current flowing through the power tube Q1 through the resistor R12, the resistor R11, the resistor R13 and the capacitor C4. When the current of the power tube Q1 is too high, the second pulse signal is stopped from being output, thereby turning off the power tube Q1, thereby realizing the overcurrent protection function. At the same time, the protection pin of the chip IC3 will also realize the input voltage detection and zero-crossing functions through the resistor R8, the resistor R9, the resistor R10, the capacitor C3, the capacitor C4, the capacitor C5 and the resistor R12. On the other hand, the feedback pin (FB) of the chip IC3 also obtains the output voltage of the power tube Q1 through the resistor R18, the resistor R19, the resistor R20, the resistor R21, the resistor R22, the resistor R23, the capacitor C25 and the capacitor C26, and realizes the output voltage closed-loop control based on the output voltage and the internal reference voltage of the chip IC3. Based on this, the duty cycle of the second pulse signal is changed in real time (that is, the on and off of the power tube Q1 is controlled in real time) through the detection results of the feedback pin and the protection pin of the chip IC3. For example, when the feedback pin of the chip IC3 detects that the output voltage of the power tube Q1 is too high, the output voltage overvoltage protection function is triggered, and the duty cycle of the second pulse signal is changed at the same time, thereby controlling the power tube Q1 to be turned off, until it is detected that the output voltage of the power tube Q1 returns to normal, and the duty cycle of the second pulse signal is changed again to turn on the power tube Q1.

[0076] When the power tube Q1 is turned off, the protection pin of the chip IC3 detects the drain voltage of the power tube Q1 through resistors R8, R9, R10 and R12, wherein the inductor L2A satisfies the volt-second balance, and the drain voltage of the power tube Q1 is equal to the input voltage.

[0077] In some embodiments, when the second pulse signal output by the chip IC3 is a low level signal, the switch tube Q2 is turned on, so that the gate and source of the power tube Q1 are discharged quickly, and then the power tube Q1 is quickly turned off.

[0078] In another embodiment, the control unit 412 further includes a capacitor C7, a capacitor C8 and a resistor R26; the capacitor C7 is connected to the transconductance pin (COMP) of the chip IC3, the capacitor C7 is also grounded through the resistor R26, and the capacitor C8 is respectively connected to the transconductance pin and the ground terminal of the chip IC3. It should be noted that the capacitor C7, the capacitor C8 and the resistor R26 are the compensation network of the chip IC3. When the protection pin of the chip IC3 detects that the input voltage of the power tube Q1 does not meet the requirements, it is discharged through the compensation network and the undervoltage protection function is triggered.

[0079] Further, such as Figure 2 As shown, the step-down module 42 includes a dimming unit 421 and a step-down unit 422, the dimming unit 421 is connected to the boost module 41 and the step-down unit 422 respectively, the dimming unit 421 is also connected to the controller 10, and the step-down unit 422 is also connected to the boost module 41;

[0080] The dimming unit 421 is used to receive a dimming signal during operation, and output a first pulse signal with a preset duty cycle to the step-down unit 422 based on the dimming signal, so that the step-down unit 422 determines the on-time according to the first pulse signal, thereby adjusting the second voltage to a preset voltage; or

[0081] The input voltage is determined according to the single pulse current, and a first pulse signal with a preset duty cycle is output to the buck unit 422 according to the input voltage to control the on and off of the buck unit 422, thereby outputting a preset voltage to the output module 43.

[0082] In some embodiments, see Figure 4 , Figure 4 is a circuit diagram of a step-down module provided by an embodiment of the utility model, such as Figure 4As shown, the dimming unit 421 includes a chip IC2, a resistor R33, a resistor R25A, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45, a resistor R55, a diode D8, a voltage regulator Z1, a voltage regulator Z5, a transistor Q4, a capacitor C13, a capacitor C12 and a capacitor C15;

[0083] The high voltage start pin (HV) of the chip IC2 is connected to the boost module 41 through the resistor R33, the power supply pin (VDD) of the chip IC2 is connected to the emitter of the transistor Q4, the feedback pin (FB) of the chip IC2 is grounded through the resistor R43, the resistor R42 and the capacitor C12 are connected in parallel with the resistor R43, the feedback pin of the chip IC2 is also connected to the anode of the diode D8 through the resistor R41 and the resistor R44, the cathode of the diode D8 is grounded through the capacitor C13, and the cathode of the diode D8 is also connected to the collector of the transistor Q4. The collector of the transistor Q4 is also connected to the base of the transistor Q4 through the resistor R45, the base of the transistor Q4 is also connected to the cathode of the voltage regulator Z1, the anode of the voltage regulator Z1 is grounded, the emitter of the transistor Q4 is connected to the resistor R55, the resistor R55 is connected to the cathode of the voltage regulator Z5, the anode of the voltage regulator Z5 is grounded, the resistor R55 is also connected to the dimming pin (DIM) of the chip IC2, the dimming pin of the chip IC2 is also connected to the controller 10, and the driving pin (GATE) of the chip IC2 is connected to the buck unit 422.

[0084] The step-down unit 422 includes a chip Q6, a resistor R34, a resistor R35, a resistor R35A, a resistor R37, a capacitor C11, a voltage regulator tube Z2, an inductor L4, an inductor L4A and a transformer TR1;

[0085] The driving end (PWM) of the chip Q6 is connected to the driving pin of the chip IC2 through the resistor R35 and the resistor R34, the capacitor C11 is connected to the resistor R34 and the driving end of the chip Q6 respectively, the capacitor C11 is also connected to the cathode of the voltage regulator tube Z2, the anode of the voltage regulator tube Z2 is connected to the dimming end (ZA) of the chip Q6, the source of the chip Q6 is connected to the resistor R35 through the resistor R35A, the source of the chip Q6 is also grounded through the resistor R37, the drain of the chip Q6 is connected to the fourth pin of the transformer TR1 through the inductor L4, the inductor L4A is connected in parallel with the inductor L4, the fifth pin of the transformer TR1 is connected to the boost module 41, and the eighth pin and the tenth pin of the transformer TR1 are respectively connected to the output module 43.

[0086] Specifically, the high voltage start pin of the chip IC2 is used to receive the second voltage and start based on the second voltage. When the chip IC2 is started, the chip IC2 switches to VCC-BUCK power supply (power supply voltage). Among them, the VCC-BUCK is mainly based on the circuit of the transistor Q4, the voltage regulator D2, and the diode D8 to provide the power supply voltage. It should be noted that the chip IC2 includes two dimming modes, namely PWM signal dimming and 0-10V dimming. When selecting the dimming mode, the two dimming modes can be determined according to the input impedance of the feedback pin of the chip IC2. Different input impedances correspond to different dimming modes. For example, when the input impedance is 3 kilo-ohms, it is a PWM dimming mode, and when the input impedance is 6 kilo-ohms, it is a 0-10V dimming mode. Specifically, when the dimming mode is PWM signal dimming, the dimming pin of the chip IC2 will receive the dimming signal input by the controller 10, and output a first pulse signal with a preset duty cycle based on the dimming signal, wherein the magnitude of the output current is determined according to the duty cycle of the first pulse signal. If the dimming mode is 0-10V dimming, the dimming pin of the chip IC2 will receive the pulse current generated by the resistor R55 and the Zener diode Z5, and output a first pulse signal with a preset duty cycle based on the pulse current, wherein the duty cycle of the first pulse signal is determined according to the size of the input current.

[0087] When the first pulse signal of the preset duty cycle is input to the driving end of the chip Q6, the chip Q6 starts to work based on the first pulse signal. When the chip Q6 is turned on, the second voltage, the primary side of the transformer TR1 and the chip Q6 form a loop, so that the primary side of the transformer TR1 generates a voltage signal; when the chip Q6 is turned off, there is no voltage signal on the primary side of the transformer TR1, based on which the preset voltage can be obtained, and the preset voltage is coupled to the secondary side, and finally the preset voltage is output to the output module 43 through the secondary side.

[0088] In some embodiments, the step-down module 42 further includes a clamping unit 423 (not shown), which is respectively connected to the boost module 41 and the step-down unit 422. The clamping unit 423 is used to limit the voltage input to the step-down unit 422 to prevent the device in the step-down unit 422 from being damaged by excessive voltage.

[0089] Specifically, Figure 4 As shown, the clamping unit 423 includes a capacitor C9, a voltage regulator Z3, a resistor R30, a resistor R30A, a resistor R31, a resistor R32, a diode D6 and a diode D7;

[0090] The anode of the diode D6 is connected to the drain of the chip Q6, the cathode of the diode D6 is connected to the resistor R32, the diode D7 is connected in parallel with the diode D6, the resistor R32 is connected to the cathode of the voltage regulator Z3, the resistor R30, the resistor R30A, and the resistor R31 are all connected in parallel with the resistor R32, the anode of the voltage regulator Z3 is connected to the boost module 41, and the capacitor C9 is connected in parallel with the voltage regulator Z3.

[0091] In some embodiments, see Figure 5 , Figure 5 is a circuit diagram of a controller provided by an embodiment of the utility model, according to Figure 5 It can be known that the dimming signal and the power supply voltage are both provided by the controller 10 .

[0092] In yet another embodiment, Figure 2 As shown, the novel intelligent street lamp power supply circuit 40 also includes an undervoltage protection module 44;

[0093] The undervoltage protection module 44 is connected to the boost module 41 and the buck module 42 respectively;

[0094] The undervoltage protection module 44 is used to detect the second voltage, and when the second voltage is lower than a threshold voltage, control the voltage reduction module 42 to stop outputting the pulse signal.

[0095] For details, please refer to Figure 6 , Figure 6 is a circuit diagram of an undervoltage protection module provided by an embodiment of the utility model, such as Figure 6 As shown, the undervoltage protection module 44 includes a resistor R57, a resistor R58, a resistor R59, a resistor R60, a resistor R61, a resistor R62, a resistor R63, a capacitor C21, a diode D10, a switch tube Q9 and a switch tube Q10;

[0096] The anode of the diode D10 is connected to the second voltage, the cathode of the diode D10 is connected to the resistor R58 through the resistor R57, the resistor R58 is connected to the control end of the switch tube Q9 through the resistor R60, the resistor R58 is also grounded through the resistor R59, the capacitor C21 is connected in parallel with the resistor R59, the control end of the switch tube Q9 is also grounded through the resistor R61, the first end of the switch tube Q9 is connected to the power supply voltage through the resistor R62, the second end of the switch tube Q9 is used for grounding, the first end of the switch tube Q9 is also connected to the control end of the switch tube Q10, the control end of the switch tube Q10 is also grounded through the resistor R63, the first end of the switch tube Q10 is connected to the dimming pin of the chip IC2, and the second end of the switch tube Q10 is used for grounding.

[0097] Specifically, when the second voltage is lower than the threshold voltage, the switch tube Q9 is turned off, so that the switch tube Q10 is turned on. At this time, the dimming pin of the chip IC2 is pulled low, so that the chip IC2 stops outputting the first pulse signal. When the second voltage is higher than the threshold voltage, the switch tube Q9 is turned on, so that the switch tube Q10 is turned off, and the dimming pin of the chip IC2 is not controlled thereby.

[0098] In yet another embodiment, Figure 2 As shown, the novel intelligent street lamp power supply circuit 40 further includes an anti-lightning processing module 45 , and the anti-lightning processing module 45 is connected to the power supply 20 and the boost module 41 respectively.

[0099] For details, please refer to Figure 7 , Figure 7 is a circuit diagram of a lightning protection processing module provided by an embodiment of the utility model, such as Figure 7 As shown, the anti-lightning processing module 45 includes a gas discharge tube GD1, a varistor RV1, a varistor RV2, a varistor RV3, a varistor RV4, a common mode inductor LF1, a common mode inductor LF2, a capacitor CY1, a capacitor CY2, a capacitor CX1, a capacitor CX2, a capacitor CB1, a capacitor CB2, an inductor L1, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a rectifier bridge BD1;

[0100] The gas discharge tube GD1 is connected to the varistor RV2 and the varistor RV3 respectively, the varistor RV2 is connected to the live wire of the power supply 20, the varistor RV3 is connected to the capacitor CX1, the capacitor CX1 is also connected to the live wire of the power supply 20, the varistor RV1 is connected to the neutral wire of the power supply 20 and the live wire of the power supply 20 respectively, the live wire of the power supply 20 is also connected to the third end of the common mode inductor LF1, the varistor RV3 is also connected to the first end of the common mode inductor LF1, the gas discharge tube GD1 is also connected to the second end of the common mode inductor LF1 through the capacitor CY1; connected to the capacitor CX1 through the capacitor CY2, the fourth end of the common mode inductor LF1 is connected to the capacitor CX2 The capacitor CX2 is also connected to the resistor R1, the resistor R1 is connected to the resistor R4, the resistor R4 is also connected to the first end of the common-mode inductor LF2, the resistor R1 is also connected to the third end of the common-mode inductor LF2, the resistor R2 is connected to the resistor R1 in parallel, the resistor R3 is connected to the resistor R4 in parallel, the fourth end and the second end of the common-mode inductor LY2 are respectively connected to the two ends of the varistor RV4, the two ends of the varistor RV4 are also respectively connected to the third end and the second end of the rectifier bridge BD1, the first end and the fourth end of the rectifier bridge BD1 are respectively connected to the two ends of the capacitor CB1, the capacitor CB1 is also connected to the boost module 41 through the inductor L1, the second end of the capacitor CB1 is used for grounding, and the second end of the inductor L1 is also grounded through CB2.

[0101] Specifically, the gas discharge tube GD1 is also used to receive lightning strikes, and realizes an anti-lightning strike function based on varistors RV1, RV2, RV3 and RV4. When the power supply 20 outputs a first voltage, the common-mode inductor LF1, the common-mode inductor LF2, the capacitor CY1, the capacitor CY2, the capacitor CX1 and the capacitor CX2 are used to eliminate electromagnetic interference in the first voltage. The capacitor CB1, the capacitor CB2 and the inductor L1 form a Π-type filter, which is mainly used to filter the first voltage, and the BD1 is used to rectify the first voltage. The resistors R1, R2, R3 and R4 are discharge resistors.

[0102] In yet another embodiment, see Figure 8 , Figure 8 is a circuit diagram of an output module provided by an embodiment of the utility model, such as Figure 8 As shown, the output module 43 includes a capacitor C18, a resistor R50, a capacitor C18A, a resistor R50A, a diode D11, a capacitor EC6, a capacitor EC7, a resistor R52, and a common mode inductor LF3;

[0103] The capacitor C18 is connected to the eighth pin of the transformer TR1, the capacitor C18 is connected to the third pin of the common-mode inductor LF3 through the resistor R50, the capacitor C18A is connected in parallel with the capacitor C18, the resistor R50A is connected in parallel with the resistor R50, the anode of the diode D11 is connected to the eighth pin of the transformer TR1, and the cathode of the diode D11 is connected to the third pin of the common-mode inductor LF3; the capacitor EC6 is respectively connected to the tenth pin of the transformer TR1 and the third pin of the common-mode inductor LF3, the capacitor EC7 and the resistor R52 are both connected in parallel with the capacitor EC6, the capacitor EC6 is also connected to the first pin of the common-mode inductor LF3, and the second and fourth pins of the common-mode inductor LF3 are respectively connected to the LED lamp 30.

[0104] Specifically, the capacitor EC6 and the capacitor EC7 are used to receive and store the preset voltage output by the transformer TR1 , and output the preset voltage to the LED lamp 20 , so as to control the brightness of the LED lamp 20 based on the preset voltage.

[0105] The utility model provides a novel intelligent street lamp power supply circuit, which includes a boost module, a buck module and an output module; the boost module is connected to the buck module, the boost module is also used to connect to the power supply, the buck module is connected to the output module, the buck module is also used to connect to the controller, and the output module is used to connect to the LED lamp. The boost module is used to receive the first voltage output by the power supply, and the first voltage is boosted to a second voltage and then input to the buck module, so that the buck module starts to work based on the second voltage; the buck module is used to receive the dimming signal output by the controller during the working process, output a first pulse signal with a preset duty cycle based on the dimming signal, and adjust the second voltage according to the first pulse signal with the preset duty cycle, so as to output the preset voltage to the output module; or obtain a single pulse current during the working process, output a first pulse signal with a preset duty cycle based on the single pulse current, and adjust the second voltage according to the first pulse signal with the preset duty cycle, so as to output the preset voltage to the output module; the output module is used to receive the preset voltage, and output the preset voltage to the LED lamp to power the LED lamp. Based on this, by setting up the collaborative work of the boost module, the buck module and the output module, the flexible adjustment and precise control of the input power supply voltage can be achieved, thereby improving the intelligence of the street lamp system, and the first voltage of the power supply is boosted by the boost module, so that when the first voltage is small, it can still meet the power supply needs of the street lamp system, thereby improving the energy utilization rate.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A new type of intelligent street lamp power supply circuit, characterized in that: The novel intelligent street lamp power supply circuit comprises a boost module, a buck module and an output module; The boost module is connected to the buck module, the boost module is also used to connect to a power source, the buck module is connected to the output module, the buck module is also used to connect to a controller, and the output module is used to connect to an LED lamp; The boost module is used to receive the first voltage output by the power supply, and boost the first voltage to a second voltage and then input it into the buck module, so that the buck module starts to work based on the second voltage; The step-down module is used to receive the dimming signal output by the controller during operation, output a first pulse signal with a preset duty cycle based on the dimming signal, and adjust the second voltage according to the first pulse signal with the preset duty cycle to output a preset voltage to the output module; or Acquire a single pulse current during operation, output a first pulse signal with a preset duty cycle based on the single pulse current, and adjust the second voltage according to the first pulse signal with the preset duty cycle to output a preset voltage to the output module; The output module is used to receive the preset voltage and output the preset voltage to the LED lamp to power the LED lamp.

2. The novel intelligent street lamp power supply circuit according to claim 1 is characterized in that: The boost module includes a control unit, a detection unit and a boost unit; The control unit is connected to the power supply and the detection unit respectively, the detection unit is connected to the boost unit, and the boost unit is connected to the power supply and the buck module respectively; The control unit is used to output a second pulse signal to the boost unit according to the first voltage, so that the boost unit starts charging and discharging according to the second pulse signal, thereby boosting the first voltage to a second voltage; The detection unit is used to detect the current and voltage of the boost unit during the charging and discharging process of the boost unit, and adjust the duty cycle of the second pulse signal according to the current and voltage so that the voltage output by the boost unit is the second voltage.

3. The novel intelligent street lamp power supply circuit according to claim 2 is characterized in that: The control unit includes a chip IC3, a resistor R24, a diode D4, a resistor R25 and a capacitor EC4; The high-voltage start pin of the chip IC3 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the power supply through the resistor R24, the power supply pin of the chip IC3 is connected to the capacitor EC4, and the capacitor EC4 is also connected to the power supply voltage through the resistor R25, the feedback pin and the protection pin of the chip IC3 are connected to the detection unit, and the drive pin of the chip IC3 is connected to the boost unit.

4. The novel intelligent street lamp power supply circuit according to claim 3 is characterized in that: The boost unit includes a power tube Q1, a resistor R46, a resistor R47, a resistor R47A, a resistor R14, a diode D5, a transistor Q2, an inductor L2A, an inductor L3 and an inductor L3A; The first end of the resistor R46 is connected to the driving pin of the chip IC3, the second end of the resistor R46 is connected to the gate of the power tube Q1 through the diode D5, the gate of the power tube Q1 is also connected to the source of the power tube Q1 through the resistor R47A, the source of the power tube Q1 is grounded through the resistor R14, the drain of the power tube Q1 is connected to the inductor L2A through the inductor L3, the inductor L3A is connected in parallel with the inductor L3, the inductor L2A is connected to the power supply, the resistor R46 is also connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the gate of the power tube Q1 through the resistor R47, and the collector of the transistor Q2 is grounded through the resistor R14.

5. The novel intelligent street lamp power supply circuit according to claim 1 is characterized in that: The voltage reduction module includes a dimming unit and a voltage reduction unit; The dimming unit is connected to the boost module and the buck unit respectively, the dimming unit is also connected to a controller, and the buck unit is also connected to the boost module; The dimming unit is used to receive a dimming signal during operation, and output a first pulse signal with a preset duty cycle to the buck unit based on the dimming signal, so that the buck unit determines the on-time according to the first pulse signal, thereby adjusting the second voltage to a preset voltage; or A single pulse current is received, and a first pulse signal with a preset duty cycle is output to the buck unit according to the single pulse current to control the on and off of the buck unit, thereby outputting a preset voltage to the output module.

6. The novel intelligent street lamp power supply circuit according to claim 5 is characterized in that: The dimming unit includes a chip IC2, a resistor R33, a resistor R25A, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45, a resistor R55, a diode D8, a voltage regulator Z1, a voltage regulator Z5, a transistor Q4, a capacitor C13, a capacitor C12 and a capacitor C15; The high voltage start pin of the chip IC2 is connected to the boost module through the resistor R33, the power supply pin of the chip IC2 is connected to the emitter of the transistor Q4, the feedback pin of the chip IC2 is grounded through the resistor R43, the resistor R42 and the capacitor C12 are connected in parallel with the resistor R43, the feedback pin of the chip IC2 is also connected to the anode of the diode D8 through the resistor R41 and the resistor R44, the cathode of the diode D8 is grounded through the capacitor C13, and the cathode of the diode D8 is also connected to the collector of the transistor Q4. The collector of the transistor Q4 is also connected to the base of the transistor Q4 through the resistor R45, the base of the transistor Q4 is also connected to the cathode of the voltage regulator Z1, the anode of the voltage regulator Z1 is grounded, the emitter of the transistor Q4 is connected to the resistor R55, the resistor R55 is connected to the cathode of the voltage regulator Z5, the anode of the voltage regulator Z5 is grounded, the resistor R55 is also connected to the dimming pin of the chip IC2, the dimming pin of the chip IC2 is also connected to the controller, and the driving pin of the chip IC2 is connected to the buck unit.

7. The novel intelligent street lamp power supply circuit according to claim 6 is characterized in that: The step-down unit includes a chip Q6, a resistor R34, a resistor R35, a resistor R35A, a resistor R37, a capacitor C11, a voltage regulator tube Z2, an inductor L4, an inductor L4A and a transformer TR1; The driving end of the chip Q6 is connected to the driving pin of the chip IC2 through the resistor R35 and the resistor R34, the capacitor C11 is connected to the resistor R34 and the driving end of the chip Q6 respectively, the capacitor C11 is also connected to the cathode of the voltage regulator tube Z2, the anode of the voltage regulator tube Z2 is connected to the dimming end of the chip Q6, the source of the chip Q6 is connected to the resistor R35 through the resistor R35A, the source of the chip Q6 is also grounded through the resistor R37, the drain of the chip Q6 is connected to the fourth pin of the transformer TR1 through the inductor L4, the inductor L4A is connected in parallel with the inductor L4, the fifth pin of the transformer TR1 is connected to the boost module, and the eighth pin and the tenth pin of the transformer TR1 are respectively connected to the output module.

8. The novel intelligent street lamp power supply circuit according to claim 1 is characterized in that: The novel intelligent street lamp power supply circuit also includes an anti-lightning processing module; The lightning protection processing module is connected to the power supply and the boost module respectively.

9. The novel intelligent street lamp power supply circuit according to claim 1 is characterized in that: The novel intelligent street lamp power supply circuit also includes an undervoltage protection module; The undervoltage protection module is connected to the boost module and the buck module respectively; The undervoltage protection module is used to detect the second voltage, and when the second voltage is lower than a threshold voltage, control the voltage reduction module to stop outputting the pulse signal.

10. A street light system, characterized in that: The street light system comprises: Controller; power supply; LED lights; and A novel intelligent street lamp power supply circuit as described in any one of claims 1 to 9.

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