Power supply for an electroluminescent panel

 

The invention relates to lighting and can be used as a power supply for an electroluminescent light panels. The technical result is to increase reliability, reduce energy consumption and ensure the stability of the output characteristics when using different types of light panels. The source contains a network rectifier, a smoothing filter, push-pull power Converter DC to AC, performed on sequentially MOS field-effect transistors. The circuit also includes a pulse-width modulator, implemented on a programmable microcontroller, driver-multiplexer pulses, the driver control the power Converter, the node of the auxiliary power supply mains filter, the node control mode anti-aliasing filter. There are a host overload protection, the node input signal for regulating the intensity of illumination, inductance, RC circuit consisting of series-connected coupling capacitor and an output resistor, and a current-limiting resistor. 3 C.p. f-crystals, 2 Il.

The invention relates to the field of light emitting electrical engineering and can be IP is establet a system isolated from other electrodes, between which is placed a layer of electroluminophores, emitting in the visible wavelength range. As electroluminophores can be used polymers with different filling (see, for example, RU 2050041 C1, Glades and other, N 05 In 33/10, 10.12.1995), including complex chemical composition (see , for example, RU 2131411 C1, IPCP RAS, and others, With 07 With 211/54, 10.06.1999). For technological and promotional purposes on the surface of the panels can be coated with various elements, in particular in the form of paint coatings on transparent and opaque bases, and the panels themselves are made flexible.

To power the electroluminescent panels use secondary sources of alternating current, which is connected to the contact paths of the electrodes. The main requirement for the sources is to ensure the stability of the lighting panel parameter that is important for their use as a lighting source for a variety of technical, industrial display device and for advertising purposes.

Thus, the known power supply for an electroluminescent panel described in patent US 5717317 Pleso, 323/222, G 09 G 3/10, 10.02.1998. The source is an inverter DC to AC, manufactured by bridge with the depends 500 Hz, who controls the elements of the bridge circuit. Due to this, at the output of the power source is formed of alternating voltage, the shape of which is determined by the parameters of the control signals and the capacitive characteristics of the electroluminescent panel.

However, in the output voltage of such blocks high proportion of higher harmonics, which leads to unnecessary power consumption. In addition, this power supply can be used with electroluminescent panels only small dimensions, for example in portable devices display the data.

The closest to this invention to the technical essence and the achieved result is a power supply for electroluminescent panels of large areas (up to 1.5 square meters). It contains a network rectifier, a current-limiting resistor connected in series smoothing filter, push-pull power Converter DC to AC, performed on sequentially MOS field-effect transistors, and inductance, as well as pulse-width modulator, the output of which is connected shaper-multiplexer pulses. Shaper converts the output signal pulse-inputelem, the output of which through the inductance associated with one of the outputs of the power supply (see application WO 99/57618 A1, GEORGE at al, G 05 F 1/00, 11.11.1999) - the closest analogue.

The disadvantages of this power supply for electroluminescent panels are also his lack of performance, similar to that described above. Power inevitably creates high frequency noise coming from it in AC. Moreover, there are known power supply has insufficient reliability due to the lack of protection against excessive output current or a short circuit on the output, as well as limited functionality due to the lack of self-restoration of power supply after overload or short circuit.

The objective of the invention is to provide a power source for the light panels on the basis of the electroluminescence free from the above disadvantages.

The technical result of the invention is to increase reliability, reduce energy consumption and ensure the stability of the output characteristics when using different types of light panels. Additional technical result is that the design of the power source provides the power supply for an electroluminescent panel contains a network rectifier, current-limiting resistor, a smoothing filter, the output of the positive voltage which is connected to the input of the converted voltage push-pull power Converter DC to AC, performed on sequentially MOS field-effect transistors, the output of which is connected inductance and a pulse-width modulator, the output of which is connected shaper-multiplexer pulses. In the device entered the site auxiliary power supply, made in the form of the Converter constant voltage constant, the node overload protection, the driver control the power Converter, network filter, the node control mode anti-aliasing filter, the node input signal for regulation of the luminous intensity and the RC circuit consisting of the United the first findings of a coupling capacitor and an output resistor, a pulse-width modulator made in the form of a programmable microcontroller and driver-multiplexer pulses is made manageable with the possibility of prohibition of generating output signals.

Mains filter, the inputs of which are the inputs of the AC voltage of industrial frequency power source e is - through current-limiting resistor, and the other is directly connected to the inputs of a smoothing filter connected to the output of the negative voltage to the first input node overload protection and output a positive voltage is also input to be converted voltage node of the auxiliary power supply. The output of the first converted voltage node of the auxiliary power supply is connected with power input to the driver control the power Converter, the node control mode anti-aliasing filter and the first input power node overload protection, and the output of the second converted voltage from the power input of the microcontroller, driver-multiplexer pulses node input signal for regulating the intensity of illumination and the second supply input node overload protection. The first output node overload protection is connected to the control input of the shaper-multiplexer pulses, the second output to the shared bus power supply for an electroluminescent panel, and the third to the second output resistor. The outputs of the shaper-multiplexer pulses are connected to the inputs of the driver control the power Converter, the outputs of which are connected to the inputs of the push-pull power Converter.

PE is vnesti glow, the inputs of which are connected to terminals for connection to an external element regulating the intensity of illumination of the electroluminescent panel. Control output of the microcontroller is connected to the input node to control the anti-aliasing filter. The outputs of the node control mode anti-aliasing filter connected to the output pins current-limiting resistor. The second output inductance associated with the second output coupling capacitor, and conclusions of the output resistor connected output terminals of the power supply for an electroluminescent panel.

The device can be characterized by the fact that the shaper-multiplexer pulses includes two D-flip-flop, two resistors, two condensers and four diode D-inputs of the triggers are interconnected and connected to the shared bus device, With the input of the first D-flip-flop, an information input of the shaper-multiplexer, connected with the cathode of the first diode, the anode of which is connected to the S-input of the first D-flip-flop, the anode of the third diode and the first resistor to the input supply voltage, direct the output of the first D-flip-flop is connected with the input of the second D-flip-flop and the cathode of the second diode, the anode of which is connected with the S-input vtorogo connected in parallel to the first diode, and the second capacitor is parallel to the second diode, the cathodes of the third and fourth diodes are connected together and are managing the input of the shaper-multiplexer, the first and second outputs which are direct outputs respectively of the first and second D-flip-flops.

The device may also be characterized by the fact that the node overload protection includes measuring transducer and a comparator whose output is the first output node overload protection, input controlled voltage comparator associated with the first potential output transducer, the second potential output which is a second output node overload protection, the first and second current findings transducer are, respectively, the first input and the third output node overload protection, input reference and supply voltages of the comparator are, respectively, the first and second power input node overload protection.

The device can be characterized, in addition, the fact that the measuring transducer includes serially connected first and second resistors, a common point which is the second potential output izmeritelnaya measuring transducer, connected to the cathodes of the first and, respectively, second diodes, the anodes of which are connected and are the first potential output transducer.

The invention is illustrated in the drawings, in which: Fig.1 presents a functional diagram of the power source; Fig.2 - schematic diagram.

The source contains (see Fig. 1) the network rectifier 10, a smoothing filter 12, a push-pull power Converter 14 DC to AC, performed on sequentially MOS field-effect transistors. The circuit also includes a pulse-width modulator, implemented on a programmable microcontroller 16, the shaper-multiplexer 18 pulses, the driver 20 controls the power Converter unit 22 of the auxiliary power supply mains filter 24, the node 26 to control the anti-aliasing filter 12. There are site 28 overload protection, the node 30 of the input signal for regulating the intensity of illumination, the inductance 32, the RC circuit consisting of series-connected coupling capacitor 34 and the output resistor 36, and a current-limiting resistor 38.

Node 28 overload protection consists of a transmitter 40 and a comparator 42.

e terminals 48 and 50 of the power source, and terminals 52 and 54 for connection to an external element, whereby it is possible to adjust the intensity of illumination of the light panel.

In Fig.2 is a schematic diagram of the device. Phantom lines selected functional blocks mentioned above and shown in Fig. 1. The network rectifier 10 is constructed in a bridge circuit on the chip UZ300. Smoothing filter 12 consists of capacitors C, S and is connected to the positive terminal of the bridge circuit through a current-limiting resistor R302, and for zero - directly.

The Converter 14 DC to AC performed on the enabled field consistently MOS-FET type IRF450, the gates of which are connected emitter followers transistors CT. The input emitter followers are used as inputs of the Converter 14. Pulse-width modulator is implemented on a programmable single-chip microcontroller 16 RISC architecture type AT90S2313-10PI. The microcontroller 16 has a built-in clock generator pulses, the frequency of which is determined by the quartz element BQ200. Implemented in the device to use a clock frequency that is sufficient to generate an output pulse of the pulse signal to the RESET input and generates a single pulse when the supply voltage.

Shaper-multiplexer 18 pulses is implemented on two D-triggers (chip KR1533TM2). Its function consists in forming on each of its two outputs of a sequence of rectangular pulses, the first of which repeats the output pulse width signal microcontroller 16, that is, the front fronts and downs of each pulse of the sequence match. The second sequence is the inverse of the first. The S-inputs of the D-flip-flops interconnected through a counter included diodes VD203 and VD204, a common point which is a control input of the shaper-multiplexer 18, serving to show or hide the formation of the output pulse trains.

The driver 20 controls the power Converter is a two-channel amplifier and implemented on the chip IR2102.

The node 22 of the auxiliary power supply is designed to power the active elements of the power source is an electroluminescent panel. It is built on back-way scheme and represents the DC / DC Converter voltage constant and consists of a transformer T1, the TOP switch DA 100 type TOP210PFI, rectifier VD100 type 30BQ100 and parametric stabilizer DA101. Output Narragansett 24 is a passive two-port network, performed on the capacitors C300-S, resistors R300 and R301 and chokes L300 and L301. The purpose of this filter 24 is to protect the power supply against short voltage spikes in the AC power and the exclusion of high-frequency noise entering the network in the operation of the Converter 14.

Node 26 to control the anti-aliasing filter 12 is an electro-mechanical relay C, the winding of which is connected to the amplifier transistor VT100 (type CT). Closing the relay contacts connected to the leads of the current-limiting resistor 38.

Node 28 overload protection consists of the measuring transducer 40, performed on diodes VD300 and VD301, resistors R219-R223 and R303-R307, and comparator 42, implemented on the differential operational amplifier whose output is the output node 28.

The node 30 of the input signal for regulating the intensity of illumination of the luminescent panel is a managed resistor voltage divider with decoupling capacitors made on the resistors R206, R208, R209 and R211, a variable resistor R207 and capacitors C, S.

The output of the power supply circuit includes the inductor L201, the RC circuit of the parallel con which are outputs of the power supply.

The device operates as follows.

Voltage industrial 220 V 50 Hz terminals 44 and 46 is fed through a line filter 24, consisting of a C300, L300, S, S, S, L301, S and C305, at the network rectifier 10 (UZ300). Next, the rectified voltage (310) through the current-limiting resistor 38 (R302) and the smoothing filter 12 (S, S) is supplied to the node 22 of the auxiliary power supply and push-pull power Converter 14. The node 22 of the auxiliary power supply has an output voltage of +12 and +5 C.

After the arrival of the supply voltage +5 V microcontroller 16 is first set to the initial state by the RESET input, and then counting the preset time interval (for example, 1.5 seconds). After this time interval on the control output of the microcontroller 16 (conclusion 3 DD204 in Fig.2) you may receive the voltage of the logic unit. This signal is applied to the input node 26 to control the anti-aliasing filter 12, which short circuits the current limiting resistor 38, which is designed to limit the inrush charging current of the capacitors snubber (S and S in Fig.2).

Next is the initialization of the software-defined mode pulse-width modulation of the output pulse signal of microtonality (for example, 20 kHz). When this pulse duration vary according to the harmonic law in the range of, for example, from 0.15 T to 0.85 T, where T is the repetition period of the pulses. Thus, at the output of the microcontroller 16 is formed of a pulse sequence, modulated width pulses are sinusoidal with a frequency that is optimal for the power of the selected type electroluminescent panel, for example 450 Hz.

This sequence is fed to the input of the shaper-multiplexer 18 pulses (triggers circuit DD205 in Fig.2).

From the outputs of the shaper-multiplexer 18 antiphase signals (direct outputs of triggers DD205 in Fig.2) are fed to the inputs of the driver 20 controls (DD206 in Fig. 2), which directly controls the push-pull power Converter 14 DC to AC.

Push-pull power Converter 14 DC to AC built according to the classical scheme and consists (see Fig.2) of the keys VT202 and VT203, which in turn is passed to the Converter output, a zero voltage (the potential of a shared bus), or maximum (potential output positive voltage smoothing filter 12).

Formed at the output of the power Converter 14 the Paeth through the inductor 32 and the separating capacitor 34, smoothing as the front edges, and the decay of pulses on the output resistor 36.

Thus, the output resistor 36 is formed by the output voltage of the power source, which is a sinusoidal voltage with a frequency equal to the modulation frequency of the pulse sequence at the output of the microcontroller 16, and with an amplitude not exceeding the half of the amplitude of the output voltage of the network rectifier 10, smoothed by the filter 12.

Protection of power supply overload is the node 28, which consists of the transmitter 40 and the comparator 42.

The output current of the power supply for an electroluminescent panel flows through the measuring transducer 40, assembled in a bridge circuit (see Fig. 2) of the resistors R219-R223 and R303-R307 and diodes VD300 and VD301.

The voltage drop across these resistors with a common point of diodes VD300 and VD301 is fed to the input of the controlled voltage comparator 42 is performed (see Fig.2) on the differential operational amplifier DA102, i.e., the subtractive input of the amplifier DA102, through resistor R106. At the summing input of the amplifier DA102 through the voltage divider resistors R103 and R104 is supplied reference voltage. If exceeded, control is engaged, the input of the shaper-multiplexer 18 and prohibiting the formation of the signals at its outputs. As a result, the keys push-pull power Converter 14 remain in the locked position, whereupon the output voltage of the power source becomes zero.

The change in the intensity of illumination of the electroluminescent panel can be done by changing the amplitude generated at the power supply output voltage by changing the fill factor of the pulse-modulated pulse signal at the output of the microcontroller 16. This function is realized by means connected to the control inputs of the microcontroller 16 node 30 of the input signal for regulating the intensity of the glow.

By changing the value of electric resistance of the resistor R207 (see Fig. 2) you can carry out a manual regulating the intensity of illumination of the electroluminescent panel.

Terminals 52 and 54 can be connected to a power source, a photosensitive element, such as a photoresistor, which automatically regulating the intensity of illumination of the electroluminescent panel.

Power supply for an electroluminescent panel made according to patent the invention and implemented in accordance with the shown in Fig. 2 Principia the results. When using a photosensitive element connected to terminals 52, 54, in the dark there was a decline in energy consumption by more than 20% by reducing the intensity of illumination of the panel, do not provide, however, any impact on its consumer properties and quality.

Claims

1. Power supply for an electroluminescent panel that contains the network rectifier, a current-limiting resistor, a smoothing filter, the output of the positive voltage which is connected to the input of the converted voltage push-pull power Converter DC to AC, performed on sequentially MOS field-effect transistors, the output of which is connected inductance and a pulse-width modulator, the output of which is connected shaper-multiplexer pulses, characterized in that it introduced a host of auxiliary power, made in the form of the Converter constant voltage constant, the node overload protection, control driver specified power Converter, network filter, the node control mode anti-aliasing filter, the node input signal regulation intense resistor, pulse-width modulator made in the form of a programmable microcontroller and driver - multiplexer pulses is made manageable with the possibility of prohibition of generating output signals, the network filter, the inputs of which are the inputs of the AC voltage of industrial frequency power supply for an electroluminescent panel, connected by their outputs to the inputs of the network rectifier, the outputs of which, one through the current-limiting resistor, and the other is directly connected to the inputs of a smoothing filter connected to the output of the negative voltage to the first input node overload protection and output a positive voltage is also input to be converted voltage node of the auxiliary power supply, the output of the first converted voltage associated with the power input driver specified control of power Converter, control unit operating mode smoothing filter and the first input power node overload protection, and the output of the second converted voltage from the power input programmable microcontroller, driver - multiplexer pulses node input signal for regulating the intensity of illumination and the second input peoplecare pulses, the second output to the shared bus, and the third to the second output resistor, the outputs of the shaper-multiplexer pulses are connected to the inputs of the driver control the specified power Converter, the outputs of which are connected to the inputs of the specified push-pull power Converter, the first and second control inputs programmable microcontroller connected with the output node of the input signal for regulating the intensity of illumination, the inputs of which are connected to terminals for connection to an external element regulating the intensity of illumination of the electroluminescent panel, control output programmable microcontroller connected to the input node to control the anti-aliasing filter, the outputs of the node control mode anti-aliasing filter connected to the output pins current-limiting resistor, the second output inductance associated with the second output coupling capacitor, and conclusions of the output resistor connected output terminals of the power supply for an electroluminescent panel.

2. Power supply under item 1, characterized in that the imaging unit is a multiplexer pulses includes two D-flip-flop, two resistors, two condensers and four diode D-input is authorized by the input of the shaper - multiplexer pulses, is connected with the cathode of the first diode, the anode of which is connected to the S-input of the first D-flip-flop, the anode of the third diode and the first resistor to the input voltage, the direct output of the first D-flip-flop is connected with the input of the second D-flip-flop and the cathode of the second diode, the anode of which is connected with the S-input of the second D-flip-flop, the anode of the fourth diode and through a second resistor to the input voltage, the first capacitor is connected in parallel with the first diode and the second capacitor in parallel with the second diode, the cathodes of the third and fourth diodes are connected together and are managing the input of the shaper - multiplexer, the first and second outputs which are direct outputs of the respective first and second D-flip-flops.

3. Power supply under item 1 or 2, characterized in that the node overload protection includes measuring transducer and a comparator whose output is the first output node overload protection, input controlled voltage comparator associated with the first potential output transducer, the second potential output which is a second output node overload protection, the first and second any conclusions izmeritelny reference and supply voltages of the comparator are respectively the first and second power input node overload protection.

4. Power supply under item 3, characterized in that the measuring transducer includes serially connected first and second resistors, a common point which is the second potential output transducer, to other terminals of the resistors, which are respectively the first and second current findings of the measuring transducer, is connected to the cathodes of the first and respectively second diodes, the anodes of which are connected and are the first potential output transducer.

 

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