CN201199750Y

CN201199750Y - Adjustable photoelectron transformer for halogen lamp

Info

Publication number: CN201199750Y
Application number: CNU2008200046753U
Authority: CN
Inventors: 陶伟洪
Original assignee: MEIMEI ELECTRONIC PRODUCT CO Ltd
Current assignee: MEIMEI ELECTRONIC PRODUCT CO Ltd
Priority date: 2008-01-25
Filing date: 2008-01-25
Publication date: 2009-02-25
Anticipated expiration: 2018-01-25

Abstract

The utility model discloses a dimmable electronic transformer of a halogen lamp, which adopts a 'controllable frequency deviation technology' to meet the requirement of electromagnetic compatibility (EMC); the dimmable electronic transformer adopts a mode of increasing the duty ratio of a driving pulse signal gradually to increase the output of the electronic transformer gradually so as to realize soft start; the current and the voltage of the main circuit are directly detected by adopting a simple circuit, by being combined with the lighting effect characteristics of the halogen lamp, the current and the voltage are adjusted and output by the algorithm model set via an MCU by program, and even if the external conditions such as the input voltage of the alternating current power supply, the load, and the like, are changed, the stability of output voltage can be still ensured; various functions of dimming operation are completed by being controlled by a common alternating current power supply; the aim of remote wireless control can be achieved by arranging a wireless remote control circuit; since a high-capacity electrolytic capacitor is not adopted for filtering, the high power factor can be obtained without adding a power factor correcting circuit, and zero-crossing monitoring is carried out to the direct current pulsing high voltage so that the circuit can be guaranteed to work normally, and the cost is reduced.

Description

Halogen lamp LED tunable optical electronic transformer

Technical field

The utility model relates to a kind of electronic transformer, is specifically related to a kind of Halogen lamp LED tunable optical electronic transformer

Background technology

There is following shortcoming in the prior art in the control of Halogen lamp LED:

The high frequency half bridge inverter circuit of tunable optical electronic transformer adopts pulse width modulation (PWM) control mode, the power switch pipe alternation, a large amount of harmonic componentss in its HF switch waveform outwards transmit by transmission line and external electromagnetic field, have formed sizable conduction and radiated interference;

" temperature-impedance " characteristic of Halogen lamp LED is positive temperature coefficient, is cold conditions before not lighting, and impedance is little, and after lighting, for hot, it is big that impedance becomes; If do not take measures, when electronic transformer powered on, output voltage reached maximum at once, Halogen lamp LED since impedance phase to little, overcurrent occur and burn phenomenon; If the restriction maximum output voltage, in the time of then can appearing at operate as normal, the phenomenon of luminance shortage; The present qualification maximum output voltage that generally adopts or alternating current input power supplying carried out cut, the mode of the control angle of flow, the additional electronic component of increase, cost increases;

When line voltage fluctuates, during the input ac power change in voltage, the output of electronic transformer also will change; When uprising as input ac power voltage, the output of electronic transformer uprises, when serious, overcurrent can take place because of the overtension that applies in the above in Halogen lamp LED, causes burning, for this phenomenon, generally adopt the way that reduces output voltage to solve, also have secondary (or auxiliary winding) at high frequency transformer to add testing circuit, feed back to primary circuit and control, control method is not too desirable, and cost is also high;

The control method of current control electronic transformer is limited, generally adopts the rotation resistance of mechanical aspects to control, and controls singlely, and power factor (PF) is not high;

The utility model content

The purpose of this utility model is: a kind of Halogen lamp LED tunable optical electronic transformer is provided, have high power factor, low harmonic content, high conversion efficiency, have " controllable frequency migration technology ", significantly reduce the EMI (electromagnetic interference) of system, simple mechanical switch can reach the complete light modulation operation of multiple function, but also can external wireless remote control module, to realize remote stepless dimming control.

The technical scheme that the utility model provides is as follows: a kind of Halogen lamp LED tunable optical electronic transformer comprises successively according to the signal input/output sequence:

One alternating current input power supplying connectivity port: for whole electronic transformer provides ac working power supply;

One filtering and rectification circuit: be connected with described alternating current input power supplying connectivity port, ac working power supply to input carries out ac filter, baffle system is the assorted letter and outside assorted letter to system transmissions of transmission outwards, through transmitting the pulse dc high voltage power supply to late-class circuit after the full-bridge rectification;

One high-frequency inverter circuit: be connected with rectification circuit with described filtering, the direct voltage of its input is converted to high-frequency ac voltage level circuit transmission backward;

One output circuit: be connected with described high-frequency inverter circuit, the high pressure of importing is converted to required voltage to be provided to load;

One power circuit: be connected with rectification circuit with described filtering, the AC power of importing be transformed to low-voltage dc power supply, to each circuit supply of internal system;

One control circuit: be connected with described power circuit, drive circuit, the various signals in the circuit system are handled, finish the every control and the protection of circuit, to the drive circuit output signal;

One sample circuit: be connected with rectification circuit, high-frequency inverter circuit and control circuit with described filtering, every controls such as the electric current of main circuit, voltage, temperature, power supply status and protection parameter are taken a sample, and the data that sample are converted to the discernible signal type of control circuit transmit to control circuit;

One drive circuit: be connected with described high-frequency inverter circuit and control circuit, be controlled by control circuit, by the change drive waveforms, thereby the final control to circuit is finished in the output of change system;

Comprise that also one produces the function waveform generator of periodically variable waveform, this function waveform generator is connected with described control circuit.

As further improvement of the utility model, in the above-mentioned Halogen lamp LED tunable optical electronic transformer, described sample detecting circuit includes resistance R 1, R4, R5, R10, capacitor C 7, diode D2, D4, capacitor C 11, and wherein R1 is connected with the output of rectification circuit with described filtering; And R4, C7 are connected with described control circuit with R1 series connection back; D2, D4, C11, R5, R10 form alternating voltage effective value testing circuit, and its output inserts described control circuit.

As further improvement of the utility model, in the above-mentioned Halogen lamp LED tunable optical electronic transformer, comprise that also one is connected in the mechanical switch SW1 on the live wire in the alternating current input power supplying, the on off operating mode of SW1 is delivered to described control circuit by D2 in the sample detecting circuit and R9.

As further improvement of the utility model, in the above-mentioned Halogen lamp LED tunable optical electronic transformer, comprise that also an independent wireless remote control accepts circuit, this circuit comprises the ATN to wireless signal coupling in the space, to L2, the L9 of interference noise filtering and to wireless signal amplification, demodulation and U3 control chip that the signal after the demodulation is carried out shaping and processing, described control circuit and U3 are electrically connected.

As further improvement of the utility model, in the above-mentioned Halogen lamp LED tunable optical electronic transformer, also include L1, the C3 of filtering dc pulse high voltagehigh frequency burr in described filtering and the rectification circuit, L1 and C3 serial connection.

As further improvement of the utility model, in the above-mentioned Halogen lamp LED tunable optical electronic transformer, also comprise the control auxiliary switch of being made up of R11, SW2 in the described sample detecting circuit, described R11 and SW2 are serially connected between power supply and the ground, and the U5 in the described control circuit is connected between R11 and the SW2.

The utlity model has following advantage: the function waveform of exporting in the function waveform that the employing function waveform generator produces and filtering and the rectification circuit compares, do the mode of Synchronous Processing with the waveform of pulse width modulation, i.e. " controllable frequency migration technology ", energy " pulse is offset and crosses flow monitoring one by one ", in real time controlled good, the reduction of system's conversion efficiency and the decline of systematic function can not appear; Soft starting mode does not increase electronic component, reduces cost; By the algorithm model of MCU by program setting, adjust output, make output voltage values keep current state, change hardly; By common mechanical switch and auxiliary switch control, finish the light modulation operation of various functions; Radio remote control circuit is set, makes things convenient for remote wireless control; Do not adopt the bigger electrochemical capacitor of capacity to carry out filtering, thereby need not increase extra active or passive type power factor correction circuit, just obtained higher power factor (PF), and the dc pulse high pressure monitored, when it approaches zero, do not produce drive signal, guarantee the reliably working of circuit.

Description of drawings

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model;

Embodiment

Below in conjunction with accompanying drawing concrete execution mode is illustrated:

As Fig. 1, shown in Figure 2, a kind of Halogen lamp LED tunable optical electronic transformer, comprise successively according to the signal input/output sequence: alternating current input power supplying connectivity port 1, filter rectifier 2, high-frequency inverter circuit 3, output circuit 4, sample circuit 5, power circuit 6, wireless receiving circuit 7, control circuit 8, drive circuit 9 and mains switch 10, for alternating current input power supplying connectivity port 1, filter rectifier 2, high-frequency inverter circuit 3 there is no different with output circuit 4 and prior art, no longer be described in detail, below in conjunction with each innovation in the technical scheme, improvements are described its principle in detail;

1, the controllable frequency migration technology that anti-electromagnetic interference adopted;

U4 is a function waveform generator 11, the waveform that the generation cycle changes, this waveform is delivered to the U5 place, will export with U5, waveform through pulse width modulation is done Synchronous Processing, deliver to drive circuit U2 via resistance R 6, R7, U2 exports through amplifying and meeting the signal that half-bridge driven requires to Q1, Q2 by R2, R3, finishes the control to main circuit; Waveform that U4 produces directly influences the frequency of each drive signal, and waveform is identical therewith for the frequency shift (FS) curve of main circuit switch waveform;

Form passive filter by C8, C9, C5, TR1, C2, interference noise is carried out filtering, satisfy in the relevant criterion requirement Electromagnetic Compatibility;

Because the curve of deviation of frequency is identical with the waveform that U4 produces, can do the specific aim correction according to institute's application product type difference (as main circuit structure, power, switching frequency etc.), circuit possesses very big flexibility, possesses good anti-interference and high reliability simultaneously;

2, the soft start of using in the tunable optical electronic transformer

U5 is for re-power or become by turning off the light when turning on light state at every turn, its two-way output control signal duty ratio progressively changes to maximum by zero beginning, by resistance R 6, R7, drive circuit U2, resistance R 2, R3 deliver to power switch pipe Q1, Q2, and the high frequency half bridge inverter circuit is controlled, the output voltage effective value progressively changes to maximum by zero, finishes soft start; Load is not had rush of current, protect satisfactory for result;

3, the automatic compensatory technique of in adjustable electronic transformer, using

Finishing the main circuit current conversion of signals by R1 is voltage signal, and the signal after R4, C7 change this carries out delivering to U5 behind the High frequency filter, forms alternating voltage effective value testing circuit by D2, D4, C11, R5, R10, and the output of two testing circuits all inserts U5.U5 judges whether to be overvoltage or under-voltage according to detected voltage, and in conjunction with the size of current current values, size to output becomes big or the processing that diminishes (not being the linear scale adjustment), and the state current with the maintenance of the assurance Halogen lamp LED shading value that output was connected is constant; And, because the size of load is the elementary main circuit current of influence directly, therefore this patent utilizes current monitoring circuit, the changing condition that detects load (arrives minimum brightness as light modulation, change Halogen lamp LED type etc.) only adjustment is done in its output, keep the Halogen lamp LED shading value to meet and control requirement and be not subjected to the external change condition influence;

4, single line connects the application of mechanical switch light regulating technology on the tunable optical electronic transformer

Form the AC power state detection circuit by D2, R9, its output is connected to U5; By C10 is the energy storage effect, guarantees to disconnect a period of time in AC power, and control circuit still has working power to keep work; Form the control auxiliary switch by R11, SW2, its status signal is delivered to U5; SW1 is the standard machinery beginning, is disposed at outside the system connecting and disconnecting of control AC power, can be the line concatenation type, can only be serially connected with in the live wire of AC power, if the user adopts this electronic transformer, then can utilize existing wiring in the building, and not need cabling again; And the cooperation by auxiliary switch, realize adjustment to any number.

After system connects AC power, disconnect two seconds of SW1, and then closed, because the energy storage effect of C10, U5 still works at the SW1 off period, by the testing circuit that D2, R9 form, can determine the state of SW1, and output is adjusted to system; As SW1 once more during repetitive operation, output is adjusted once more to system; Promptly SW1 is operated in the above described manner, system adjusts (as 25%, 50%, 75%, 100% etc.) by the percentage circulation of setting output;

If SW1 opening time be 5 seconds, after closing afterwards, then enter the passage learning state (to sign indicating number) of wireless remote control; Under energising shape electricity, press auxiliary switch SW2, system enters luminosity and resets state, by Digiplex system is exported adjustment (wireless remote control is a stepless dimming), when reaching the value that needs setting, presses SW2 once more and determines; By this operation, can carry out counting arbitrarily the setting of numerical value to system's output circulation adjustment percentage again;

5, adopt the wireless remote controller of split-type design

U5 is connected with wireless receiving module by JP1, and L2, L9 carry out filtering to interference noise, and ATN is coupled to the wireless signal in the space, and U3 finishes amplification, the demodulation of wireless signal, and the signal after the demodulation is carried out shaping and processing; U5 resolves the signal that is transmitted by wireless receiving module, according to signal content, does associative operation;

6, the realization of high power factor in electronic transformer

High frequency burr by L1, C3 filtering dc pulse high pressure is detected the dc pulse high pressure by D2, R9, by U5 detected signal is handled, with the output of controlling and driving signal.When U5 was lower than certain numerical value by the detected voltage in R9 place, U5 turn-offed the output to driver module, has realized the protection to system, guarantees that system is in the safe operation zone when obtaining high power factor.

Above embodiment is explanation rather than restriction the utility model just, as: the make-and-break time of switch SW 1 can be 1 second, 2 seconds, 4 seconds; The waveform that the U4 function waveform generator is produced is not only sine wave, can also be triangular wave, sawtooth waveforms; Wireless remote control module is independent module; can be integrated in the same circuit board; also an independent circuit board can be set in addition, look operating position and need determine whether connect or the like ..., of this sort conversion all falls within the protection range of the present utility model.

Claims

1. Halogen lamp LED tunable optical electronic transformer comprises successively according to the signal input/output sequence:

It is characterized in that: comprise that also one produces the function waveform generator of periodically variable waveform, this function waveform generator is connected with described control circuit.

2. Halogen lamp LED tunable optical electronic transformer according to claim 1, it is characterized in that: described sample detecting circuit includes resistance R 1, R4, R5, R10, capacitor C 7, diode D2, D4, capacitor C 11, and wherein R1 is connected with the output of rectification circuit with described filtering; And R4, C7 are connected with described control circuit with R1 series connection back; D2, D4, C11, R5, R10 form alternating voltage effective value testing circuit, and its output inserts described control circuit.

3. Halogen lamp LED tunable optical electronic transformer according to claim 1, it is characterized in that: comprise that also one is connected in the mechanical switch SW1 on the live wire in the alternating current input power supplying, the on off operating mode of SW1 is delivered to described control circuit by D2 in the sample detecting circuit and R9.

4. Halogen lamp LED tunable optical electronic transformer according to claim 1, it is characterized in that: comprise that also an independent wireless remote control accepts circuit, this circuit comprises the ATN to wireless signal coupling in the space, to L2, the L9 of interference noise filtering and to wireless signal amplification, demodulation and U3 control chip that the signal after the demodulation is carried out shaping and processing, described control circuit and U3 are electrically connected.

5. Halogen lamp LED tunable optical electronic transformer according to claim 1 is characterized in that: also include L1, the C3 of filtering dc pulse high voltagehigh frequency burr in described filtering and the rectification circuit, L1 and C3 serial connection.

6. according to each described Halogen lamp LED tunable optical electronic transformer in claim 3 or 4, it is characterized in that: also comprise the control auxiliary switch of forming by R11, SW2 in the described sample detecting circuit, described R11 and SW2 are serially connected between power supply and the ground, and the U5 in the described control circuit is connected between R11 and the SW2.