CN201018704Y - Digitalized intelligent power supply of electromagnetic induction lamp - Google Patents

Abstract

The utility model relates to a control technology of electric light source. The utility model relates to a digitalization intelligent type power supply which provides a power supply for the electromagnetic induction lamp. The utility model comprises an electromagnetic compatibility electric circuit of electric interlock in turn, a rectification filter circuit, an active power factor calibrating circuit, and a half bridge driving power output circuit. In particular to a numerical control monolithic processor is respectively connected with the active power factor calibrating circuit and the half bridge driving power output circuit. A man-machine interaction contact surface is connected with the monolithic processor through the interface circuit, and a sensor group is connected with the monolithic processor. The utility model has a facilitated hardwired connection, a agile control mode. The utility model has the advantages of perfect protective system, low fault rate, high effectiveness of electrical energy transformation, and remarkable fruit of energy saving.

Description

Digital intelligent power supply of electromagnetic induction lamp

The technical field is as follows: the utility model relates to a control technical field of electric light source is the digital intelligent power of an electromagnetic induction lamp who provides the power specially for the electromagnetic induction lamp.

(II) background technology: the electromagnetic induction lamp is widely applied as a modern novel high-efficiency energy-saving electric light source due to the remarkable advantages of high luminous efficiency, good color rendering property, long service life, energy conservation, high efficiency, environmental protection and the like. The electromagnetic induction lamp adopts the electromagnetic induction principle, so that the plasma is coupled with a circuit magnetic line, and external electric energy is converted into energy required by the internal work of the lamp. The pair of soft magnetic rings sleeved outside the lamp tube acts like a primary coil of a transformer, and the closed lamp tube acts like a secondary coil of the transformer. After the power supply is switched on, the power supply can generate alternating current with the working frequency of 210-250 k, so that an alternating magnetic field is generated in a discharge area. According to the Faraday's electromagnetic induction law, the changing magnetic field can generate induced current in the lamp tube, so that the mixed vapor of low-pressure mercury and inert gas can generate discharge, ultraviolet rays with the wavelength of 253.7nm can be radiated, and the ultraviolet rays can be converted into visible light through the fluorescent powder. Since there are no electrodes, no delicate components are present in the tube portion and the lifetime of the whole system is mainly determined by the power supply, the lifetime of such lamps can be made very long, i.e. up to over 100,000 hours. Compared with other products, the service life of the energy-saving lamp is 10-15 times that of a common energy-saving lamp and 10-12 times that of a high-intensity gas discharge lamp, and the energy-saving effect is 50 percent of that of the common energy-saving lamp, 75 percent of that of a sodium lamp and a metal halide lamp and 90 percent of that of a common incandescent lamp. However, the current electromagnetic induction lamp adopts an electronic ballast formed by an analog circuit to provide a power supply, and is limited by the traditional analog control principle, so that the hardware circuit of the electromagnetic induction lamp is complex, the protection function is incomplete, and the control mode is single.

(III) the invention content: the utility model aims at overcoming that current electronic ballast hardware circuit is complicated, protect function is imperfect, the single problem of control mode, specially provide an electromagnetic induction lamp digital intelligent power for the electromagnetic induction lamp.

The utility model discloses the power is according to the theory of operation of electromagnetic induction lamp, uses singlechip digital control technique, based on Digital Addressable Lighting Interface (DALI), the power that a reliability of development design is high, longe-lived, efficient (interior consumption is little), small, difficult counterfeit. The system is provided with a hardware and software platform with scheme-level real-time control capability, digital signals are used as basic control sources through a human-computer interaction interface (a PC or a control panel), corresponding digital modules are driven by the signals through a transmission route, and the digital modules complete operation actions, so that the working states of electromagnetic induction lamps (single, multiple and grouped) are automatically changed or adjusted quantitatively or in real time according to needs, and a perfect protection system is provided.

The utility model has the following concrete scheme: the digital intelligent power supply of the electromagnetic induction lamp comprises an electromagnetic compatibility circuit, a rectification filter circuit, an active power factor correction circuit and a half-bridge driving power output circuit which are sequentially and electrically connected, and is characterized in that: the digital control single chip microcomputer is additionally arranged and is respectively connected with the active power factor correction circuit and the half-bridge drive power output circuit, the human-computer interaction interface is also connected with the single chip microcomputer through an interface circuit, and the sensor group is connected with the single chip microcomputer.

The utility model discloses still set overcurrent, excessive (owing) voltage, excess temperature, lightning protection, repeated ignition, no load protection circuit in the circuit.

Active power factor correction circuit mainly comprises power switch tube Q1, boost inductor L1, boost diode D1, output filter capacitance C2 and feedback loop.

Half drive power output circuit mainly comprises half-bridge driver chip IC2 and two power switch Q2, Q3 and supporting circuit.

Interface circuit includes DALI, touch button, infrared remote control interface.

The digital control singlechip has 8000 byte FLASH (program memory), 512 byte EEPROM (erasable memory), 512 byte SRAM (data memory), three timer, 10 AD sampling precision. Two 12-bit high-speed dedicated power stage controllers PSC, integrated DALI protocol, automatically detect the "SWISS" or 0-10 volt brightness adjustment signal.

The utility model discloses the power has realized the reduction of energy consumption through using modern lighting technology, has improved the flexibility of system and has reduced the cost of maintaining simultaneously. Convenient and customized dimming control can be used to meet prevailing conditions (maximum load, power consumption rate, visible light, location, task type) and local requirements. The intensity of the daylight, the maximum dimming requirement and the effect of the sensor on energy saving are self-evident. It includes static components (programmed dimming or switching according to time intervals) and dynamic components (switching or dimming according to detected conditions and ambient light brightness), and can implement light source, dimming and switching strategies (sensors, programmed switching, sunlight absorption, maximum dimming load) with different efficiencies, so that the energy consumption can be reduced by 30% to 60%. In the maximum load stage, the effective load can be reduced by setting dimming points of different loads, so that further reduction of energy consumption is realized.

The utility model discloses the power provides an open environment, and under this environment, the power can realize arbitrary grouping and control with multiple mode according to the change in the parameter selection and the space of specific task requirement, sensor, can be dimmed or increase the light brightness of workshop by individual independent control to the realization realizes realizing best light according to task and worker's age and adjusts. Furthermore, it is not necessary to move and rewire the lamps when space needs to be rearranged or tasks changed. In contrast, in many cases, optimal lighting conditions are achieved with only a need to reconfigure and program the power supply.

The utility model discloses the relevant signal of power lasts provides information to central computer, including the fault signal of energy information, lamp and power. When dealing with large groups of lighting devices, the energy information generated by the lighting network can be used to verify energy savings, generate load distribution, internal billing, and lighting costs per unit of product, and even provide accurate information through sub-metering. When abnormal conditions in the entire lighting network are monitored, requiring immediate replacement of the lights and power supply or requiring troubleshooting, an alarm will be raised and may indicate which type of element (light or power supply) needs to be replaced and where it is.

(IV) description of the drawings:

fig. 1 is a block diagram of the circuit structure of the present invention;

fig. 2 is an overall circuit diagram of the present invention;

FIG. 3 is a circuit diagram of the power factor correction circuit of the present invention;

fig. 4 is a circuit diagram of the half-bridge driving power output circuit of the present invention;

fig. 5 is a DALI interface circuit diagram of the present invention;

fig. 6 is a schematic diagram of the single-chip microcomputer QM-CPU1 of the present invention.

(V) specific embodiment:

the utility model discloses the power mainly comprises other auxiliary circuit such as high performance's electromagnetic compatibility circuit (EMC adopts conventional electromagnetic compatibility circuit), rectification filter circuit (adopts conventional rectification filter circuit), extremely stable active power factor correction circuit (APFC), half-bridge drive and power output circuit, singlechip digital control circuit, signal interface circuit, sensor group, man-machine interface and overcurrent, overvoltage, undervoltage, excess temperature, lightning protection, repeated ignition, no load protection circuit. See the block diagram of the circuit structure of fig. 1 and the circuit diagram of fig. 2.

The alternating current power supply is connected with the EMC electromagnetic compatibility circuit after passing through the lightning protection circuit and then connected with the rectification filter circuit, and the direct current output of the rectification filter circuit is connected with the APFC active power factor correction circuit. The power factor correction circuit is used for reducing the harmonic wave of input current, improving the power factor, reducing the pollution to a power grid, and simultaneously providing stable input voltage for a rear stage, so that the output voltage is not influenced by the voltage change of the power grid, and the lamp can be normally started and operated in a larger voltage change range of the power grid.

The APFC circuit (see fig. 3) is mainly composed of a power switch Q1, a boost inductor L1, a boost diode D1, an output filter capacitor C2, and a feedback loop. The operating principle of the APFC is based on the physical relationship between the current and the voltage of the boost inductor L1. When Q1 is turned on, the boost diode D1 is turned off, and the filter capacitor C2 is discharged through the load. When Q1 is changed from on to off, the sudden change potential generated by L1 enables D1 to be biased in the forward direction to be turned on, and stored energy in L1 is released through D1 to charge C2. Since Q1 and D1 are alternately turned on, the rectifier output current continuously flows through L1, thereby generating a stable output voltage. The output voltage is typically 400V. As shown in figure two. Zero current sampling signals provided by the L1 auxiliary winding can realize zero-crossing switching-on, and the loss of a switching tube in the circuit is effectively reduced. The current sampling and voltage sampling signals are processed by a singlechip to output Power Factor Correction (PFC) control signals, and the PFC control signals are sent to a power switch tube Q1 through a driving circuit to realize output constant voltage and constant power and open circuit protection and short circuit protection of the circuit.

The half-bridge drive and power output circuit (see fig. 4) is mainly composed of IC2 and Q2, Q3. The IC2 is a half-bridge driving chip QM-IC2 special for an electromagnetic induction lamp digital intelligent power supply independently developed by our company, and the chip has the characteristics of small chip size (DIP 8), high integration level (capable of driving an upper switch device and a lower switch device of the same bridge arm simultaneously), fast dynamic response, strong driving capability, high working frequency and the like. The logic input of the chip can be compatible with a standard CMOS or TTL output circuit, and can be directly driven by a signal generated by a singlechip. The power level control high level (PSC-H) and power level control low level (PSC-L) control signals output by the singlechip pass through the IC2, so that the output driving waveforms can directly drive an upper high-power MOS tube and a lower high-power MOS tube of a half-bridge power output circuit, thereby simplifying the circuit and ensuring simple and convenient control. The singlechip outputs different Pulse Width Modulation (PWM) signals to achieve the purpose of power regulation and realize stepless dimming. The current and voltage sampling signals and other sensor signals are connected to the single chip microcomputer to realize overcurrent, over (under) voltage and load open circuit protection functions, so that the whole circuit works stably and reliably.

The interface circuit comprises interfaces of control modes such as DALI, touch keys, infrared remote control and the like. The DALI interface mainly uses a high-speed optocoupler to realize isolation of DALI from the single chip microcomputer, see fig. 5.

The digital control takes a singlechip as a core. Data sent from a human-computer interaction interface (a PC or a control panel) is sent to the singlechip through an interface circuit, and the singlechip interprets instructions and sends corresponding signals to the half-bridge driver. The half-bridge driver controls the lamp through the power output circuit, completing the ignition, operation and related control of the lamp. Meanwhile, the singlechip feeds various related data back to the DALI. The single chip microcomputer can also automatically process (such as automatic adjustment according to the ambient illumination and automatic human body induction) according to sensor signals (such as photosensitive sensors, temperature sensors and activity sensors) and detect faults, and if the faults occur (such as over-temperature), the power supply is prohibited from working.

The digital control circuit IC1 of the single chip microcomputer is an electromagnetic induction lamp digital intelligent power supply special control single chip microcomputer QM-CPU1 which is independently developed by our company, and has 8000 bytes FLASH,512 bytes EEPROM,512 bytes SRAM, three timers, 10 bits AD sampling precision, in particular two 12 bits high-speed special power level controllers (PSC), a power factor correction function is provided, a reverse complementary variable frequency PWM function with dead zone time facilitates the regulation and control of light, a DALI protocol is integrated, and a 'Swiss' or 0-10V brightness regulation signal is automatically detected, so that a hardware circuit is simplified, and functions of programmable lighting of a lamp tube, high-precision digital dimming, logarithmic rule dimming, diagnosis and fault protection, optical isolation communication, low-power consumption standby mode and the like are easily realized. The pin function is seen in fig. 6.

The utility model discloses the key of software design is from the different control mode that starts to each stage of normal work according to the electromagnetic induction lamp, confirms the turning point that mode conversion or control variable change, selects reasonable controlled variable for the output characteristic of power matches with the dynamic characteristic of electromagnetic induction lamp. Before the lamp is triggered, a certain open circuit voltage must be provided for the lamp, and the control mode is voltage feedback control. A voltage reference variable value is set, and the magnitude of the open-circuit voltage can be controlled according to needs. The most important sign for judging whether the lamp is triggered is the change of the dynamic current of the lamp, and the most important sign can be judged by setting a current threshold. When the low-temperature state is not triggered successfully once, the digital controller is triggered again after proper time delay. After repeated ignition for a plurality of times, the failure of triggering will enter a fault state, and the power supply is forbidden to work. Once it is detected that the lamp has ignited, the digital controller starts to regulate the lamp current, the magnitude of which determines the time at which the lamp reaches steady state. Different control currents and powers can also be set during this period in accordance with lamp voltage variations. When the lamp enters into steady state work, the power reference is set, and a power feedback mode is carried out, so that the lamp can work under constant power.

After power-on reset, the single chip starts to work. The single chip detects the error and obtains the data entered by the interface circuit. If the received data is valid data and the addresses are matched, the data is the data of the power supply; if it is a group match, the group relationship is determined. Once the correct instruction is obtained, the program immediately executes the corresponding subroutine. These instructions include control instructions, configuration instructions, request instructions, broadcast instructions, and the like. The control command generates a corresponding signal and sends the signal to the driver to control the relevant working state, and the light grade is adjusted through PWM; the configuration instructions are used to set the power supply, including setting minimum and maximum illumination thresholds, decay times and rates, packet levels, etc. The data are generally stored in an EEPROM, and can be directly read from the EEPROM without being set when the computer is started; the request command is used for feeding back the power state, and all settings can be requested, including attenuation, lamp tube, general fault and power; the broadcast command is address-exempt, so all power-to-broadcast commands correspond, and all functions are independent of power address.

After the single chip microcomputer is initialized, two complementary PWM square waves are generated in an interruption mode according to the requirement of an instruction, and the two complementary PWM square waves are isolated by a half-bridge driver to drive a power output circuit, so that the purpose of controlling and adjusting the electromagnetic induction lamp is achieved. Meanwhile, related parameters and related signals of the electromagnetic induction lamp are directly or indirectly fed back to the single chip microcomputer, and the single chip microcomputer processes the parameters and the signals again. Typically a digital PID algorithm is used here. The digital PID algorithm is a linear control, it forms the control deviation according to the given value and the actual output value, the proportion, integral and differential of the deviation form the control quantity through the linear combination, the single chip outputs the control quantity from the PWM mouth according to a certain format to drive the power output circuit, thus the whole forms a closed loop circuit to realize the digital control of the lamp body. Since the control amount is calculated from the deviation value at the sampling time, discretization processing is required. The specific method comprises the following steps:

let e (k) be the output control quantity of the regulator,

k _F is a coefficient of proportionality that is,

c _i in order to be able to integrate the time constant,

then the PI difference equation in its discrete form is used as:

u (k) is a control amount output at time k,

e (i) is a historical deviation signal which can be the deviation of voltage, current and power value,

e (k) is the k sampling deviation, T is the sampling period, where the integral coefficient

Taking constant voltage PI control as an example, a voltage reference value, i.e., a control target value, is first set and expressed by a 16-system number, then a single chip microcomputer samples an output lamp terminal voltage value, the sampled voltage value is compared with the reference value, the obtained result is e (K), meanwhile, the sampled voltage value is accumulated in each deviation value Σ e (i) before the sampling, and values of Kp and Ki obtained through experiments are selected and substituted into the formula to obtain a control quantity u (K) output at the kth moment.

DALI is a digitally addressable lighting interface, and the implementation standard is IEC929, which is adopted in many countries in europe. A2-wire system is used to define a digital communication protocol for sending and receiving commands. It includes 1 start bit, 8 address bits, 8 data bits, and 2 stop bits. In a communication cycle, a rising edge is defined as a start bit, a rising edge of each cycle after the start bit is defined as 1, a falling edge is defined as 0, and an end bit is a high level of two cycles. The 8 address bits allow communication with 16 power packs or 64 power supplies at a time. 8 data bits of the downloaded and uploaded information complete control functions including on/off, dimming level, decay time, etc.

By way of example: for example, the electromagnetic induction lamp digital intelligent power supply is used for carrying out system control on a road street lamp, and the number of street lamps is 100. According to the Digital Addressable Lighting Interface (DALI) protocol we can assign addresses to them, which can be divided into two groups of 50. Thus each street lamp has a unique and different address. In the system control, a timing switch (such as 8 night, 00 on, 6 morning, 00 off), a fixed-stage adjustment (such as 20 night, 00-24, 00 full power, 24, 00-6, 00 half power) can be performed according to needs, and on the basis, the self-adaptive adjustment can be performed according to the difference of ambient brightness, climate influence (with or without moonlight), and the like. If 100 watt is used for each lamp, 10 kilowatt is used for 100 kilowatt lamps, and the total power required by the full-power work of the lamp is as follows, namely 20 hours at night and 00-6 days in the next day, the power is saved by more than 30 percent by using the digital intelligent power supply according to the scheme, wherein the power is only 70 kilowatt hours. If the system adopts PC control, the scheme can be modified by utilizing the singlechip online self-programming technology, such as the scheme modification for adjusting the working time and the specific time of a special road section according to the seasonal change and the like. If the device is equipped with related equipment, the functions of electric energy metering, electric power monitoring and the like can be realized. If a problem occurs, the problem of which lamp can be immediately reflected on the PC. If "2380" is displayed, it can be regarded that the lamp of the second group No. 38 lamp has a problem. Therefore, the operation is more convenient and quick.

The electromagnetic induction lamp digital intelligent power supply is very suitable for the following occasions:

1. road lighting, large public places such as stations, docks, airports and subways, and the lighting is adjusted according to different lighting schemes;

2. a workshop or a factory building, which adjusts illumination according to different time or illumination;

3. small and open offices, where the user can control the lighting himself;

4. conference rooms and classrooms, requiring different lighting schemes to achieve different types of uses;

5. supermarkets and certain retail stores, where sales and layout of goods are constantly changing;

6. hotel lobbies and conference rooms that require adaptive time, events and functions;

7. restaurants, need to adjust the lighting according to time (from breakfast to lunch to dinner).

In conclusion, the digital intelligent power supply of the electromagnetic induction lamp adopts a digital control mode, and based on a Digital Addressable Lighting Interface (DALI), the single chip microcomputer is utilized to realize the control of the starting process and the steady state operation of the lamp, so that the power supply is matched with the load characteristics of the lamp at different stages, and the abnormal state protection of the lamp can be realized.

Claims (6)

1. The utility model provides an electromagnetic induction lamp digital intelligent power, is including the electromagnetic compatibility circuit, rectification filter circuit, active power factor correction circuit, the half-bridge drive power output circuit that connect gradually the electricity, its characterized in that: the digital control single chip microcomputer is additionally arranged and is respectively connected with the active power factor correction circuit and the half-bridge driving power output circuit, the human-computer interaction interface is also connected with the single chip microcomputer through an interface circuit, and the sensor group is connected with the single chip microcomputer.

2. The digital intelligent power supply of electromagnetic induction lamp as claimed in claim 1, characterized in that: and an over-current protection circuit, an over-voltage protection circuit, an under-voltage protection circuit, an over-temperature protection circuit, a lightning protection circuit, a repeated ignition protection circuit and a no-load protection circuit are arranged.

3. The digital intelligent power supply of electromagnetic induction lamp as claimed in claim 1, characterized in that: the active power factor correction circuit mainly comprises a power switch tube Q1, a boost inductor L1, a boost diode D1, an output filter capacitor C2 and a feedback loop.

4. The digital intelligent power supply of electromagnetic induction lamp as claimed in claim 1, characterized in that: the half-drive power output circuit mainly comprises a half-bridge drive chip IC2, two power switches Q2 and Q3 and a matched circuit.

5. The digital intelligent power supply of electromagnetic induction lamp as claimed in claim 1, characterized in that: the interface circuit comprises a DALI, a touch key and an infrared remote control interface.

6. The digital intelligent power supply of electromagnetic induction lamp as claimed in claim 1, characterized in that: the digital control singlechip is provided with 8000 bytes of FLASH,512 bytes of EEPROM,512 bytes of SRAM, three timers, 10 bits of AD sampling precision, two 12 bits of high-speed special power level controllers PSC, an integrated DALI protocol and an automatic detection SWISS or 0-10V brightness adjusting signal.

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