CN217904711U

CN217904711U - Intelligent street lamp controller

Info

Publication number: CN217904711U
Application number: CN202221931449.6U
Authority: CN
Inventors: 谭平平; 夏大叶; 王亮军
Original assignee: Zhonghui Microelectronics Co ltd
Current assignee: Zhonghui Microelectronics Co ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-11-25
Anticipated expiration: 2032-07-25

Abstract

Intelligence street lamp controller includes: a microcontroller; the switch circuit is connected between the alternating current power supply end and the street lamp power supply; the sampling circuit is arranged on a live wire connected with the switching circuit; the metering circuit is connected with the sampling circuit; the dimming circuit is connected with the street lamp power supply; the power supply circuit supplies power to each circuit; the microcontroller is connected with the switching circuit, the metering circuit and the dimming circuit, the dimming circuit comprises a 0-10V dimming circuit and a PWM dimming circuit which are sequentially connected, the output voltage of the 0-10V dimming circuit is the power supply voltage of the PWM dimming circuit, and the microcontroller respectively outputs PWM signals to the 0-10V dimming circuit and the PWM dimming circuit. The utility model discloses can discern the mode of adjusting luminance of street lamp power and switch PWM or 0-10V and adjust luminance, solve current street lamp controller and only have PWM or 0-10V mode of adjusting luminance, the problem that the product is not adapted appears easily.

Description

Intelligent street lamp controller

Technical Field

The utility model belongs to the technical field of photoelectric control, concretely relates to intelligence street lamp controller.

Background

A street lamp controller is a device for controlling the switching of street lamps and performing brightness adjustment in a lighting system. According to the dimming power supply used by the street lamp, the dimming mode of the street lamp controller mainly comprises two modes: PWM dimming and 0-10V dimming mode. The principle of PWM dimming is that the output current of a street lamp power supply is changed by changing the width of a pulse signal, so that the brightness of a lamp is changed; the principle of 0-10V dimming is to change the output current of the street lamp power supply through the voltage change of 0-10V, thereby changing the brightness of the lamp. Generally, a street lamp controller with a PWM dimming mode or a street lamp controller with a 0-10V dimming mode is selected according to the power condition of the street lamp. However, a large amount of labor cost is needed for communication, so as to determine which street lamp controller is used to adapt to the street lamp power supply, if the street lamp controller is not adapted to the street lamp power supply, if the street lamp controller adopting the PWM dimming mode is installed on the street lamp power supply only having the 0-10V dimming mode, the street lamp controller cannot be normally used, and needs to be replaced again, which not only wastes manpower and material resources, but also delays the project construction progress.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an intelligent street lamp controller with two kinds of modes of adjusting luminance of PWM and 0-10V can discern the mode of adjusting luminance of street lamp power and switch into corresponding mode of adjusting luminance.

In order to achieve the above object, the present invention adopts the following technical solutions:

intelligence street lamp controller includes: a microcontroller; the switch circuit is connected between the 220V alternating current power supply end and the street lamp power supply and is used for controlling the on/off of the street lamp power supply; the sampling circuit is arranged on a live wire connected with the switching circuit and is used for converting the working current of the lamp into a voltage signal; the metering circuit is connected with the sampling circuit and is used for transmitting the collected data including the working current of the lamp to the microcontroller; the dimming circuit is connected with a street lamp power supply and is used for converting the PWM signal output by the microcontroller into a PWM dimming signal or a dimming signal of 0-10V and outputting the PWM dimming signal or the dimming signal to the street lamp power supply for dimming control; the power supply circuit supplies power to the circuits; the microcontroller is connected with the switching circuit, the metering circuit and the dimming circuit, the dimming circuit comprises a 0-10V dimming circuit and a PWM dimming circuit which are sequentially connected, the output voltage of the 0-10V dimming circuit is the power supply voltage of the PWM dimming circuit, and the microcontroller outputs PWM signals to the 0-10V dimming circuit and the PWM dimming circuit respectively.

Furthermore, the 0-10V dimming circuit comprises a second-stage RC circuit and an operational amplifier circuit which are connected in sequence, wherein the input end of the second-stage RC circuit is connected with one PWM signal output pin of the microcontroller, and the output end of the second-stage RC circuit is connected with the input end of the operational amplifier circuit.

Furthermore, the operational amplifier circuit comprises a first operational amplifier and a second operational amplifier, the output end of the second-stage RC circuit is connected with the non-inverting input end of the first operational amplifier, the inverting input end of the first operational amplifier is grounded and is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the input end of the PWM dimming circuit.

Furthermore, the PWM dimming circuit comprises a PMOS tube and a triode, the source electrode of the PMOS tube is connected with the output end of the 0-10V dimming circuit, the grid electrode of the PMOS tube is connected with the collector electrode of the triode, and the drain electrode of the PMOS tube is the output end of the PWM dimming circuit and is connected with the power supply interface of the street lamp; the emitting electrode of the triode is grounded, and the base electrode of the triode is connected with a PWM signal output pin of the microcontroller.

Furthermore, a first protection circuit is arranged between the PWM dimming circuit and the street lamp power interface, the first protection circuit comprises a thermistor protection device and a TVS tube protection device, one end of the thermistor protection device is connected with the output end of the PWM dimming circuit, and the other end of the thermistor protection device is connected with the street lamp power interface; one end of the TVS tube protection device is connected with the output end of the PWM dimming circuit, and the other end of the TVS tube protection device is grounded.

Furthermore, the output end of the PWM dimming circuit is connected to a first diode, the anode of the first diode is connected to the output end of the PWM dimming circuit, and the cathode of the first diode is connected to the input end of the first protection circuit.

Furthermore, the output end of the PWM dimming circuit is provided with a grounded load resistor and a grounded filter capacitor.

Furthermore, the power circuit comprises a second protection circuit, a rectification filter circuit, an RCD absorption circuit, an output voltage control circuit, an overvoltage protection circuit, a starting circuit and an isolation transformer, wherein two output ends of the isolation transformer respectively output two paths of direct current to supply power to the microcontroller, the switch circuit, the dimming circuit and the metering circuit.

Further, the second protection circuit is connected with a zero line of a 220V alternating current power supply end, and the second protection circuit comprises a piezoresistor, a filter inductor, a safety capacitor, a thermistor and a seventh resistor; the voltage dependent resistor is connected between a zero line and a live line, the seventh resistor and the filter inductor are connected in parallel and then connected on the zero line behind the voltage dependent resistor, the safety capacitor is connected between the zero line and the live line and is positioned between the seventh resistor and the filter inductor which are connected in parallel, and the thermistor is connected on the live line behind the safety capacitor;

the rectification filter circuit comprises a rectification bridge, a filter circuit and a voltage equalization circuit which are sequentially connected, wherein the rectification bridge consists of four diodes, the filter circuit comprises a first high-voltage filter electrolytic capacitor and a second high-voltage filter electrolytic capacitor, and the voltage equalization circuit comprises resistors which are connected with the first high-voltage filter electrolytic capacitor and the second high-voltage filter electrolytic capacitor in parallel;

the RCD absorption circuit is connected with the input winding of the isolation transformer, the RCD absorption circuit comprises a twelfth resistor, a thirteenth resistor, a third capacitor and a second diode, the first end of the input winding of the isolation transformer is connected with the output end of the rectifying and filtering circuit, the second end of the input winding of the isolation transformer is connected with the cathode of the second diode, and the twelfth resistor, the thirteenth resistor and the third capacitor are connected between the first end and the second end of the input winding of the isolation transformer; the second end of the input winding of the isolation transformer is also connected with a single-stage flyback regulator;

the output voltage control circuit is connected with a Vsen pin of the single-stage flyback regulator, and comprises a first voltage-dividing resistor and a second voltage-dividing resistor;

the overvoltage protection circuit is connected with a Vreg pin of the single-stage flyback regulator, the overvoltage protection circuit comprises a third diode, a fourteenth resistor and a fifteenth resistor, the Vreg pin of the single-stage flyback regulator is grounded through the fifteenth resistor and is connected with the cathode of the third diode through the fourteenth resistor, the anode of the third diode is connected with the first end of an auxiliary winding of the isolation transformer, and the second end of the auxiliary winding of the isolation transformer is grounded;

the starting circuit is connected with a VCC (voltage converter) pin and a GND (ground) pin of the single-stage flyback regulator, and the starting circuit comprises a fourth capacitor and a fifth capacitor.

Further, the system also comprises a communication module connected with the microcontroller, wherein the communication module comprises a 4G mobile communication module and/or an NB-IOT wireless communication module and/or an HPLC communication module.

According to the technical scheme, the utility model discloses an intelligent street lamp controller adopts the design of two unifications with dimming circuit, dimming circuit comprises 0-10V dimming circuit and the PWM dimming circuit that connects gradually, 0-10V dimming circuit's output voltage is as PWM dimming circuit's supply voltage, microcontroller can be simultaneously to 0-10V dimming circuit and PWM dimming circuit output PWM signal, dimming circuit's structure makes microcontroller can realize PWM dimming and 0-10V dimming output respectively according to specific control logic, and can automatic identification the dimming mode of street lamp power supply switches PWM or 0-10V and adjust luminance, it only has single PWM or 0-10V dimming mode to have solved current street lamp controller, the problem that the product does not adapt appears easily, influence the engineering implementation progress, avoid extravagant manpower and materials.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a circuit block diagram of an intelligent street lamp controller according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a dimming circuit according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a power circuit according to an embodiment of the present invention.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings, wherein for convenience of illustration, the drawings showing the structure of the device are not to scale and are partially enlarged, and the drawings are only examples, which should not limit the scope of the invention. It should be noted that the drawings are simplified and are not to precise scale, which are only used for the purpose of facilitating and clearly explaining the embodiments of the present invention. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "front," "back," "bottom," "upper," "lower," and the like refer to an orientation or positional relationship based on that shown in the drawings for ease of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

As shown in fig. 1, the intelligent street lamp controller of this embodiment includes a switch circuit 1, a sampling circuit 2, a metering circuit 3, a serial port level conversion circuit 4, a microcontroller 5, a dimming circuit 6, a communication module 7, and a power circuit 8. The street lamp power supply is connected with a zero line and a live wire of a 220V alternating current power supply end through a switch circuit 1, and the switch circuit 1 can adopt a small and medium power relay to realize the control of the power supply of the street lamp power supply. Sampling circuit 2 sets up on the fire line that links to each other with switch circuit 1, is located between switch circuit 1 and the 220V supply terminal, and sampling circuit 2 can adopt manganese copper resistance or current transformer, and sampling circuit 2 of this embodiment is manganese copper resistance, and manganese copper resistance converts the operating current of lamps and lanterns into voltage signal. The metering circuit 3 is respectively connected with the sampling circuit 2 and the zero line, and is used for detecting data such as load voltage, current, power and the like according to a real-time acquired (working) current signal of the lamp and a voltage signal on the zero line, and outputting the data to the microcontroller 5. The microcontroller 5 can send an instruction to the metering circuit 3 to control the metering circuit 3 to collect detection data such as voltage, current and power. The metering circuit 3 may be a commercially available metering chip, such as the metering chip model RN 8209G. The metering circuit 3 of this embodiment is connected with the microcontroller 5 through the serial port level conversion circuit 4, and the serial port level conversion circuit 4 is used for carrying out level conversion on the signal output by the metering circuit 3 and then outputting the signal to the microcontroller 5, and carries out level conversion on the signal output by the microcontroller 5 and then outputs the signal to the metering circuit 3, and in this embodiment, the serial port level conversion circuit 4 converts the 5V signal output by the metering circuit 3 into a 3.3V signal and sends the signal to the microcontroller 5, and converts the 3.3V signal output by the microcontroller 5 into a 5V signal and sends the signal to the metering circuit 3.

The microcontroller 5 is a control center of the street lamp controller, and is respectively connected with the switch circuit 1, the metering circuit 3 and the dimming circuit 6. The microcontroller 5 can acquire the status information of the lamp according to the detection data output by the metering circuit 3. Microcontroller 5 is through communication module 7 and master station communication connection, sends the status information of lamps and lanterns to master station, and communication module 7 of this embodiment includes 3 kinds of communication modules, can realize 4G mobile communication, NB-IOT wireless communication and HPLC communication three kinds of modes, and in the concrete application, the model of 4G mobile communication module is A7670C, the model of NB-IOT wireless communication module is BC25, the model of HPLC communication module is WTZ13S. The microcontroller 5 controls the power supply of the street lamp to be powered on or powered off by outputting a level signal to the switch circuit 1. The microcontroller 5 outputs a PWM signal to the dimming circuit 6, and the dimming circuit 6 converts the PWM signal output by the microcontroller 5 into a PWM dimming signal or a dimming signal of 0-10V, and outputs the PWM dimming signal or the dimming signal to a street lamp power supply for dimming control. The PWM signal output from the microcontroller 5 of the present embodiment is a PWM signal having an amplitude of 3.3V. In some optional embodiments, an indicator light circuit 9 may be further included, and the indicator light circuit 9 is used for indicating information such as power supply, network status, communication status, and the like. The microcontroller 5 of the present embodiment employs a microprocessor of the type R7FA2L1AB2 DFM.

The power supply circuit 8 is used for supplying power to each circuit of the intelligent street lamp controller, in the embodiment, the power supply circuit 8 can output three voltages of 12V, 5V and 3.3V, wherein the 12V voltage supplies power to the switching circuit 1, the dimming circuit 6 and the HPLC communication module in the communication module 7, the 5V voltage supplies power to the metering circuit 3, and the 3.3V voltage supplies power to the 4G mobile communication module and the NB-IOT communication module in the microcontroller 5 and the communication module 7.

The utility model discloses an intelligence street lamp controller's theory of operation as follows:

after power-on, the dimming circuit 6 outputs a dimming signal of 0-10V in a default mode and the dimming signal is 10V, so that the brightness of the lamp is the maximum value, when a circuit lamp power supply is powered on to work, the lamp is turned on and the brightness is the maximum, and at the moment, the working current I of the lamp is the maximum value Imax;

the metering circuit 3 collects the working current flowing through the sampling circuit 2, the collected working current is Imax, and the collected current data is transmitted to the microcontroller 5 through the serial port level conversion circuit 4;

after stable operation for a period of time, such as about 3 seconds, the microcontroller 5 outputs a dimming signal of 5V to the dimming circuit 6, and if the dimming mode of the street lamp power supply is a dimming mode of 0-10V, the brightness of the lamp is reduced by half at the moment, and the working current of the lamp is also reduced by half; the microcontroller 5 sends a current collection instruction to the metering circuit 3, the metering circuit 3 collects the working current flowing through the sampling circuit 2, and the collected working current is 1/2Imax, which indicates that the street lamp power supply performs dimming operation according to the dimming signal, and the dimming mode of the street lamp power supply is a 0-10V dimming mode without switching the dimming mode;

if the dimming mode of the street lamp power supply is a PWM dimming mode, the microcontroller 5 outputs a dimming signal of 5V to the dimming circuit 6, the brightness of the lamp cannot change according to the dimming signal, and the working current cannot change; the microcontroller 5 sends a current acquisition command to the metering circuit 3, the metering circuit 3 acquires the working current flowing through the sampling circuit 2, the acquired working current is still Imax, which indicates that the street lamp power supply does not perform dimming operation according to the dimming signal, the dimming mode of the street lamp power supply is a PWM (pulse width modulation) dimming mode, and the street lamp power supply can be judged for a plurality of times, for example, after 3 times of judgment, the microcontroller 5 is switched to output a PWM signal, and the pulse width of the signal is the maximum value;

after stable operation for a period of time, the microcontroller 5 adjusts the pulse width of the PWM signal to be half of the maximum value, and if the brightness of the lamp is reduced by half and the collected operating current is about 1/2Imax, the microcontroller determines and confirms that the street lamp power supply is the PWM dimming power supply.

Fig. 2 is a circuit diagram of a specific application of the dimming circuit of the present invention, as shown in fig. 2, the dimming circuit 6 of this embodiment includes a 0-10V dimming circuit 6-1 and a PWM dimming circuit 6-2 connected in sequence, the output voltage of the 0-10V dimming circuit 6-1 is the supply voltage of the PWM dimming circuit 6-2, the input terminal of the 0-10V dimming circuit 6-1 is connected to a PWM signal output pin of the microcontroller 5, and the microcontroller 5 outputs a PWM signal to the 0-10V dimming circuit and the PWM dimming circuit 6-2 at the same time.

The 0-10V dimming circuit 6-1 of the present embodiment includes a two-stage RC circuit, a first operational amplifier U23A and a second operational amplifier U23B. The input end of the second-stage RC circuit is connected with a PWM signal output pin of the microcontroller 5, the output end of the second-stage RC circuit is connected with the non-inverting input end of the first operational amplifier U23A, the inverting input end of the first operational amplifier U23A is grounded and is connected with the output end of the first operational amplifier U23A at the same time, the output end of the first operational amplifier U23A is connected with the non-inverting input end of the second operational amplifier U23B, the inverting input end of the second operational amplifier U23B is connected with the output end of the second operational amplifier U23B, and the output end of the second operational amplifier U23B is connected with the input end of the PWM dimming circuit 6-2. The two-stage RC circuit of the present embodiment is composed of a first resistor R178, a second resistor R93, a first capacitor C71 and a second capacitor C72.

The PWM dimming circuit 6-2 comprises a PMOS (P-channel metal oxide semiconductor) tube M3 and a triode Q4, the source electrode of the PMOS tube M3 is connected with the output end of the 0-10V dimming circuit, the grid electrode of the PMOS tube M3 is connected with the collector electrode of the triode Q4 through a third resistor R181, and the drain electrode of the PMOS tube M3 is the output end of the PWM dimming circuit. The emitter of transistor Q4 is grounded and the base is connected to a PWM signal output pin of microcontroller 5. A fourth resistor R96 is connected between the source and the gate of the PMOS transistor M3, and a fifth resistor R180 and a sixth resistor R129 are connected between the base and the emitter of the transistor Q4.

In the embodiment, a first protection circuit is further arranged between the PWM dimming circuit 6-2 and the street lamp power interface J15, the first protection circuit comprises a thermistor protection device PTC and a TVS tube protection device D14, one end of the thermistor protection device PTC is connected with the output end of the PWM dimming circuit 6-2, and the other end of the thermistor protection device PTC is connected with the street lamp power interface J15, so that components cannot be burnt when the output end dimming line and a ground wire are in short circuit or a wrong connection line is connected with an alternating current 220V high-voltage power. One end of the TVS tube protective device D14 is connected with the output end of the PWM dimming circuit 6-2, and the other end is grounded and used for preventing noise signals such as high-voltage pulses and the like introduced from the outside from damaging the dimming circuit. In this embodiment, the output end of the PWM dimming circuit 6-2 is connected to a first diode D13, the anode of the first diode D13 is connected to the output end of the PWM dimming circuit 6-2, the cathode of the first diode D13 is connected to the input end of the protection circuit, and the first diode D13 is used for placing a dimming signal line for reverse connection and burning out the circuit. In this embodiment, a load resistor R94 connected to ground is further disposed at the output end of the PWM dimming circuit 6-2 for stabilizing the dimming voltage output. In this embodiment, a grounded filter capacitor C70 is further disposed at the output terminal of the PWM dimming circuit 6-2 for voltage stabilization and filtering. Optionally, a voltage stabilizing filter circuit is further disposed between the 0-10V dimming circuit 6-1 and the PWM dimming circuit 6-2 in this embodiment, the voltage stabilizing filter circuit in this embodiment is composed of two capacitors C73 and C74 connected in parallel, both the capacitors C73 and C74 are grounded, and the voltage stabilizing filter circuit can make the output voltage of the 0-10V dimming circuit 6-1 more stable and smooth.

The utility model discloses adjust luminance PWM and adjust luminance the design for a dimmer circuit with 0-10V, the output voltage of 0-10V dimmer circuit is as PWM circuit's supply voltage, realizes PWM respectively through different control logic and adjusts luminance and 0-10V output of adjusting luminance. The utility model discloses a working process of dimmer circuit does:

when the dimming mode is 0-10V, the microcontroller 5 simultaneously outputs PWM dimming signals (PWM 1 and PWM 2) to the 0-10V dimming circuit 6-1 and the PWM dimming circuit 6-2, the signal output to the 0-10V dimming circuit 6-1 by the microcontroller 5 is a PWM1 square wave signal with adjustable pulse width, the square wave signal is changed into direct current after passing through a 2-stage RC circuit, and the direct current is amplified to a required dimming signal voltage (0-10V dimming voltage) through the operational amplification circuit and output to the source electrode of the PMOS tube M3; the microcontroller 5 simultaneously outputs a high level signal PWM2 to the PWM dimming circuit 6-2, the triode Q4 is conducted, the grid electrode of the PMOS tube M3 is grounded, the PMOS tube M3 is conducted at the moment, and the 0-10V dimming voltage is output to the J15.

When the dimming mode is a PWM dimming mode, for example, when the PWM dimming circuit sends a dimming signal with an amplitude of 10V, the microcontroller 5 outputs a PWM1 square wave signal with a maximum pulse width to the 0-10V dimming circuit 6-1, the voltage output after amplification by the operational amplifier is 10V, the microcontroller 5 outputs a dimming signal (PWM 2) with an amplitude of 3.3V to the PWM dimming circuit, and the PWM dimming signal with an amplitude of 10V can be finally output by switching on and off the triode Q4 and the PMOS transistor M3 to achieve level conversion; the PWM dimming signals with other amplitudes only need to change the pulse width of the PWM1 signal of the 0-10V circuit.

The PWM dimming circuit of the utility model uses the combination design of the triode and the PMOS tube, on one hand, the triode is a flow control device, the large current of the collector is controlled by the small current of the base, and the problem of small output current of the triode can be solved, thereby improving the load carrying capacity; on the other hand, the PMOS tube is used as a switching device, the PMOS tube is a voltage-controlled device, the through-current capacity is high, the voltage drop is almost 0 when the PMOS tube is completely switched on, the phenomenon that the error of the output voltage is large due to the large saturation voltage drop of the collector and the emitter of the triode when the current of the collector is overlarge can be avoided, and the inaccuracy of dimming is avoided by reducing the error of the output voltage.

Fig. 3 is a circuit diagram of a power circuit according to an embodiment of the present invention, the power circuit of this embodiment is an isolated flyback power circuit topology structure. As shown in fig. 3, the power circuit of this embodiment includes a second protection circuit, a rectifying and filtering circuit, an RCD absorption circuit, an output voltage control circuit, an overvoltage protection circuit, a start circuit, and an isolation transformer T1, two output ends of the isolation transformer T1 respectively output two paths of direct currents 16v _p1 and 16v _p2, the two paths of direct currents are respectively converted into voltages required by the circuits through a voltage conversion circuit, the voltage conversion circuit is a conventional voltage conversion circuit, and in this embodiment, 16v _p1 is converted into 12V and 3.3V through an LDO chip V44 and a DCDC chip U3 to supply power to a microcontroller, a communication module, a switching circuit, and a dimming circuit; 16V _P2is converted to 5V by LDO chip U5 to power the metering circuit.

The second protection circuit is connected with a zero line (UN) and a live line (UL) of a 220V alternating current power supply end, and comprises a piezoresistor R12, a filter inductor L1, a safety capacitor C9, a thermistor RP1 and a resistor RL1. The voltage dependent resistor R12 is connected between the zero line and the live line and used for preventing external high-voltage pulse and other interference signals from being introduced into the burning controller. The seventh resistor RL1 is connected with the filter inductor L1 in parallel and is connected with a zero line behind the piezoresistor R12, and the seventh resistor RL1 provides a leakage path for the filter inductor L1 when the power is off. The safety capacitor C9 is connected between the zero line and the live line and behind the resistor RL1 and the filter inductor L1 which are connected in parallel, and the safety capacitor C9 is used for filtering differential mode signals. The thermistor RP1 is connected on a live wire behind the safety capacitor C9, when a rear-stage circuit is short-circuited, a large current flows through the thermistor RP1, the temperature of the thermistor RP1 rises, and the resistor increases, so that the current is cut off to protect the rear-stage circuit from being burnt.

The rectification filter circuit comprises a rectifier bridge U3, a filter circuit and a voltage equalization circuit which are connected in sequence. The rectifier bridge D3 of the present embodiment is composed of four diodes, and the rectifier bridge D3 is used to rectify 220V/AC power into pulsating dc power. The filter circuit of the embodiment is composed of two high-voltage filter electrolytic capacitors C7 and C15, the two high-voltage filter electrolytic capacitors C7 and C15 are connected to the output end of the rectifier bridge D3 to convert pulsating direct current into stable direct current, and the two high-voltage filter electrolytic capacitors connected in series are used to meet the withstand voltage requirement of the capacitors. The voltage balancing circuit comprises resistors connected with the high-voltage filtering electrolytic capacitors in parallel to balance voltages at two ends of the capacitors, each high-voltage filtering electrolytic capacitor of the embodiment is connected with two resistors in parallel, the eighth resistor R3 and the ninth resistor R9 are connected in series and then connected with the first high-voltage filtering electrolytic capacitor C7 in parallel, and the tenth resistor R15 and the eleventh resistor R16 are connected in parallel and then connected with the second high-voltage filtering electrolytic capacitor C15 in parallel.

The RCD absorption circuit of this embodiment includes a twelfth resistor R5, a thirteenth resistor R6, a third capacitor C41, and a second diode D4, where a first end of the input winding is connected to the output end of the rectifying and filtering circuit, a second end of the input winding is connected to the negative electrode of the second diode D4, and the twelfth resistor R5, the thirteenth resistor R6, and the third capacitor C41 are connected between the first end and the second end of the input winding. The second end of the input winding is also connected with a single-stage flyback regulator U1, and a 900V MOS tube is integrated in the single-stage flyback regulator U1. When U1 is turned off, the energy stored in the input winding of the isolation transformer T1 passes through the RCD snubber circuit to avoid damaging the single-stage flyback regulator U1.

The output voltage control circuit is connected with a Vsen pin of the single-stage flyback regulator U1 and used for regulating the output voltage. The output voltage control circuit of the present embodiment includes a first voltage dividing resistor R13 and a second voltage dividing resistor R17, and the divided voltage is connected to the Vsen pin of U1, thereby adjusting the output voltage.

The overvoltage protection circuit is connected with a Vreg pin of the single-stage flyback regulator U1 and is used for protecting the single-stage flyback regulator U1. The overvoltage protection circuit of the embodiment includes a third diode D2, a fourteenth resistor R4, and a fifteenth resistor R7, the Vreg pin of the single-stage flyback regulator U1 is grounded via the fifteenth resistor R7, and is connected to the negative electrode of the third diode D2 via the fourteenth resistor R4, the positive electrode of the third diode D2 is connected to the first end of the auxiliary winding of the isolation transformer T1, and the second end of the auxiliary winding is grounded. The auxiliary winding voltage of the isolation transformer T1 is sampled and is divided by a fourteenth resistor R4 and an electric fifteenth resistor R7 after passing through a third diode D2, the divided voltage is connected to a Vreg pin of U1, when the voltage of Vreg exceeds a protection threshold value, the internal part of U1 stops working, and vice versa.

The starting circuit is connected with a VCC pin and a GND pin of the single-stage flyback regulator U1. The starting circuit of the embodiment includes a fourth capacitor C10 and a fifth capacitor C13, and when the ac or dc bus voltage is added, the fourth capacitor C10 and the fifth capacitor C13 between the VCC pin and the GND pin of U1 are charged by the internal high-voltage starting current; when the voltage of VCC reaches the turn-on threshold of U1, the operation is started, and the auxiliary winding voltage of the isolation transformer T1 is established to provide continuous energy for U1.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Intelligence street lamp controller, its characterized in that includes:

a microcontroller;

the switch circuit is connected between the 220V alternating current power supply end and the street lamp power supply and is used for controlling the on/off of the street lamp power supply;

the sampling circuit is arranged on a live wire connected with the switching circuit and is used for converting the working current of the lamp into a voltage signal;

the metering circuit is connected with the sampling circuit and is used for transmitting the collected data including the working current of the lamp to the microcontroller;

the dimming circuit is connected with a street lamp power supply and is used for converting the PWM signal output by the microcontroller into a PWM dimming signal or a dimming signal of 0-10V and outputting the PWM signal or the dimming signal to the street lamp power supply for dimming control;

the power supply circuit supplies power to the circuits;

the microcontroller is connected with the switching circuit, the metering circuit and the dimming circuit, the dimming circuit comprises a 0-10V dimming circuit and a PWM dimming circuit which are sequentially connected, the output voltage of the 0-10V dimming circuit is the power supply voltage of the PWM dimming circuit, and the microcontroller outputs PWM signals to the 0-10V dimming circuit and the PWM dimming circuit respectively.

2. The intelligent street lamp controller as claimed in claim 1, wherein: the 0-10V dimming circuit comprises a secondary RC circuit and an operational amplification circuit which are sequentially connected, wherein the input end of the secondary RC circuit is connected with one PWM signal output pin of the microcontroller, and the output end of the secondary RC circuit is connected with the input end of the operational amplification circuit.

3. The intelligent street light controller of claim 2, wherein: the operational amplification circuit comprises a first operational amplifier and a second operational amplifier, the output end of the second-stage RC circuit is connected with the non-inverting input end of the first operational amplifier, the inverting input end of the first operational amplifier is grounded and is simultaneously connected with the output end of the first operational amplifier, the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the input end of the PWM dimming circuit.

4. The intelligent street lamp controller as set forth in claim 1, wherein: the PWM dimming circuit comprises a PMOS tube and a triode, the source electrode of the PMOS tube is connected with the output end of the 0-10V dimming circuit, the grid electrode of the PMOS tube is connected with the collector electrode of the triode, and the drain electrode of the PMOS tube is the output end of the PWM dimming circuit and is connected with the power supply interface of the street lamp; the emitter of the triode is grounded, and the base of the triode is connected with a PWM signal output pin of the microcontroller.

5. The intelligent street lamp controller as set forth in claim 1, wherein: a first protection circuit is arranged between the PWM dimming circuit and the power interface of the street lamp, the first protection circuit comprises a thermistor protection device and a TVS tube protection device, one end of the thermistor protector is connected with the output end of the PWM dimming circuit, and the other end of the thermistor protector is connected with the power interface of the street lamp; one end of the TVS tube protection device is connected with the output end of the PWM dimming circuit, and the other end of the TVS tube protection device is grounded.

6. The intelligent street lamp controller as recited in claim 5, wherein: the output end of the PWM dimming circuit is connected with a first diode, the anode of the first diode is connected with the output end of the PWM dimming circuit, and the cathode of the first diode is connected with the input end of the first protection circuit.

7. The intelligent street light controller of claim 6, wherein: the output end of the PWM dimming circuit is provided with a grounded load resistor and a grounded filter capacitor.

8. The intelligent street lamp controller as claimed in claim 1, wherein: the power supply circuit comprises a second protection circuit, a rectifying filter circuit, an RCD absorption circuit, an output voltage control circuit, an overvoltage protection circuit, a starting circuit and an isolation transformer, wherein two output ends of the isolation transformer respectively output two paths of direct currents to supply power for the microcontroller, the switch circuit, the dimming circuit and the metering circuit.

9. The intelligent street light controller of claim 8, wherein: the second protection circuit is connected with a zero line of a 220V alternating current power supply end and comprises a piezoresistor, a filter inductor, a safety capacitor, a thermistor and a seventh resistor; the voltage dependent resistor is connected between a zero line and a live line, the seventh resistor and the filter inductor are connected in parallel and then connected on the zero line behind the voltage dependent resistor, the safety capacitor is connected between the zero line and the live line and is positioned between the seventh resistor and the filter inductor which are connected in parallel, and the thermistor is connected on the live line behind the safety capacitor;

the RCD absorption circuit is connected with the input winding of the isolation transformer and comprises a twelfth resistor, a thirteenth resistor, a third capacitor and a second diode, the first end of the input winding of the isolation transformer is connected with the output end of the rectification filter circuit, the second end of the input winding of the isolation transformer is connected with the cathode of the second diode, and the twelfth resistor, the thirteenth resistor and the third capacitor are connected between the first end and the second end of the input winding of the isolation transformer; the second end of the input winding of the isolation transformer is also connected with a single-stage flyback regulator;

10. The intelligent street lamp controller as set forth in claim 1, wherein: the system also comprises a communication module connected with the microcontroller, wherein the communication module comprises a 4G mobile communication module and/or an NB-IOT wireless communication module and/or an HPLC communication module.