CN205610969U - Protection circuit and lamp - Google Patents

Abstract

The utility model provides a protection circuit, this protection circuit of is listened the voltage and/or an electric current of LED module, and in the LED module voltage be greater than an excessive pressure value and/or the LED module when the electric current is greater than a default, get into a guard mode, in order to clamp down on the LED module voltage. Foretell circuit design, can avoid LED drive circuit because of driving voltage or electric current overrun (for example: the drive signal that different electronic ballast provided is different, and the part probably causes the problem of overtension) damage LED drive circuit.

Description

Protection circuit and lamp

Technical field

This utility model relates to field of lighting appliances, specifically relates to protection circuit and lamp.

Background technology

LED illumination technology is just fast-developing and instead of traditional electric filament lamp and fluorescent lamp.For being filled with the fluorescent lamp of noble gas and hydrargyrum, LED straight lamp is without filling hydrargyrum.Therefore, various by seem the tradition illumination domestic dominated of option such as fluorescent bulbs and fluorescent tube or working space illuminator in, LED straight lamp is it is hardly surprising that be increasingly becoming the illumination option that people highly expect.The advantage of LED straight lamp comprises the ruggedness of lifting and life-span and relatively low power consuming.Thus it is contemplated that after all factors, LED straight lamp would is that the illumination option of escapable cost.

Known LED straight lamp generally comprises fluorescent tube, be located in fluorescent tube and with the circuit board of light source, and is located at the lamp holder of lamp tube ends, is provided with power supply, is electrically connected by circuit board between light source and power supply in lamp holder.But, existing LED straight lamp still has following a few class problem to need to solve:

Commercially available common electric ballast is mainly divided into instantaneous starting type (Instant Start) electric ballast, preheating start-up type (Program Start) electric ballast two kinds.Electric ballast has resonance circuit, it drives design to mate with the load characteristic of daylight lamp, i.e. electric ballast is capacitive component at daylight lamp before lighting, and for resistive device after lighting, corresponding startup program is provided, and makes what daylight lamp can be correct to light.And LED is non-linear component, entirely different with the characteristic of daylight lamp.Furthermore, the fan-out capability of each electric ballast (output voltage, output electric current) and the voltage of output procedure, current status all differ, and LED straight lamp is easily damaged because of misuse.

Because the problems referred to above, this utility model set forth below and embodiment.

Utility model content

At this, summary describes the many embodiments about " this utility model ".But described vocabulary " this utility model " is used merely to describe the complete description of some embodiment (in spite of in claim) disclosed in this description rather than all possible embodiment.Some embodiment of each feature or aspect of being described below as " this utility model " can merge to form LED straight lamp or an a portion by different way.

This utility model provides a kind of new LED straight lamp, and its various aspects (with feature), to solve the problems referred to above.

A kind of LED straight lamp, it is characterised in that comprise: be socketed on the lamp holder at the both ends of the peripheral framework of elongate；

For luminous LED module；

And for making the lamp circuit module of described LED module lighting；Described lamp circuit module is embedded in described lamp holder；

Described lamp holder has lamp holder body, retractor device；

Described retractor device is arranged on lamp holder body.

Preferably, described lamp holder body is additionally provided with have and lamp socket be electrically connected with conductive pin.

Further, described retractor device has telescopically pars contractilis, and its one end is along conductive pin direction outwardly convex, and the other end is arranged at the interior intracavity of lamp holder body.Further, the extensible member being arranged at lamp holder body interior is connected with flexible member.

Preferably, described retractor device has telescopically pars contractilis, and its one end is along conductive pin direction outwardly convex, and the height of described projection is less than the height of conductive pin.

Preferably, when described LED straight lamp is connected to lamp socket, described retractor device along the axially opposing movement of LED straight lamp, thus is caused the described pars contractilis end being built in the body of lamp holder to trigger microswitch by lamp socket extruding, thus realizes the electrical connection of civil power and LED straight lamp；When LED straight lamp takes out from lamp socket, owing to being made pars contractilis reversely release by elastic force, reach the effect of power-off.

So, the LED straight lamp of this utility model scheme, before being installed in light fixture, lamp adapter assembly will not be energized, thus the installation personnel for LED straight tube fluorescent tube provides suitable electrical shock protection safety.

A kind of LED straight lamp, it is characterised in that: LED straight lamp,

Comprise: be socketed on the lamp holder at the both ends of the peripheral framework of elongate；

For luminous LED module；

And for making the lamp circuit module of described LED module lighting；Described lamp circuit module is embedded in described lamp holder and/or described external surrounding frame body；

Described lamp holder has lamp holder body, retractor device；

Described retractor device is arranged on lamp holder body.

Preferably, described lamp holder body is additionally provided with have and lamp socket be electrically connected with conductive pin.

Further, described retractor device has telescopically pars contractilis, and its one end is along conductive pin direction outwardly convex, and the other end is arranged at the interior intracavity of lamp holder body.Further, the extensible member being arranged at lamp holder body interior is connected with flexible member.

Preferably, described retractor device has telescopically pars contractilis, and its one end is along conductive pin direction outwardly convex, and the height of described projection is less than the height of conductive pin.

Preferably, when described LED straight lamp is connected to lamp socket, described retractor device along the axially opposing movement of LED straight lamp, thus is caused the described pars contractilis end being built in the body of lamp holder to trigger microswitch by lamp socket extruding, thus realizes the electrical connection of civil power and LED straight lamp；When LED straight lamp takes out from lamp socket, owing to being made pars contractilis reversely release by elastic force, reach the effect of power-off.

So, the LED straight lamp of this utility model scheme, before being installed in light fixture, lamp adapter assembly will not be energized, thus the installation personnel for LED straight tube fluorescent tube provides suitable electrical shock protection safety.

Preferably, described peripheral framework is glass lamp or plastics fluorescent tube.

Preferably, described lamp holder is provided with air-vent.

Preferably, described lamp holder is the mixing of plastic material, aluminium material, plastics and aluminium material.

Optionally, described fluorescent tube has one first pin and one second pin.

Optionally, described first circuit board is arranged at one first end of LED straight lamp, and described second circuit board is arranged at one second end of LED straight lamp, and wherein said first end is relative to each other with described second end.

Optionally, described first end has one first lamp holder, and described second end has one second lamp holder, and described first circuit board is positioned in described first lamp holder, and described second circuit board is positioned in described second lamp holder.

Optionally, the length dimension of described second lamp holder is the 30%-80% of length dimension of described first lamp holder.By above-mentioned circuit and interstructural layout designs, the EMI problem of LED straight lamp can be reduced, and improve the life-span of electric capacity and the reliability of integrated circuit, and reduce lighttight lamp holder length and increase the length of light-transmitting lamp vessel, the light-emitting area of increase fluorescent tube can be made and increase the heat radiation of LED.

Optionally, multiple LED component of described LED module are arranged on a flexible circuit board, wherein said flexible circuit board comprises a first line layer and one second line layer, and described first line layer electrically connects the plurality of LED component, and described second line layer electrically connects described filter circuit.

Optionally, the thickness of described second line layer is more than the thickness of described first line layer.

This utility model separately provides a kind of LED straight lamp, and including a fluorescent tube and two lamp holders being located at outside described lamp tube ends portion, the size of said two lamp holder can be identical or differ.When the size of two lamp holders is for differing, optionally, size is relatively headlight area of bed the 30% to 80% of described less lamp holder.

Optionally, described lamp holder is provided with the hole for heat radiation.

Preferably, the hole described lamp holder being used for heat radiation is arc.

Optionally, the hole described lamp holder being used for heat radiation is three camber lines not of uniform size.

Optionally, the hole described lamp holder being used for heat radiation is ascending three camber lines gradually changed.

This utility model separately provides a kind of LED straight lamp, including: the lamp holder of described fluorescent tube one end is located at by a fluorescent tube and；One power supply, is located in described lamp holder；One lamp plate, is located in described fluorescent tube, and described lamp plate is provided with a light source；By described lamp plate electrical communication between described light source and described power supply；Described lamp plate is a bendable circuit soft board.

Optionally, described bendable circuit soft board is a sandwich circuit layer (tool conductive effect), and described light source is located on described line layer, and described light source is connected with described power sourced electric by described line layer.

Optionally, described bendable circuit soft board also includes one dielectric layer, overlapped with described line layer；Described dielectric layer is located at the side that described line layer is opposing with light source, and is fixed on the inner peripheral surface of described fluorescent tube.

Optionally, described bendable circuit soft board is 0.3 to 0.5 along the proportion between circumferentially extending length and the girth of described fluorescent tube inner peripheral surface of described fluorescent tube.

Optionally, described bendable circuit soft board surface also includes one layer of circuit protecting layer.

Optionally, it is connected by wire routing between described bendable circuit soft board and described power supply.

Optionally, described bendable circuit soft board is located on described reflectance coating.

Optionally, along the circumferential direction of described fluorescent tube, described bendable circuit soft board is positioned at the side of described reflectance coating.

Optionally, described reflectance coating is located at described lamp plate both sides and circumferentially extending along described fluorescent tube.

Optionally, described fluorescent tube inner peripheral surface or outer peripheral face can be coated with adhesive film, for outwardly and inwardly isolating fluorescent tube after fluorescent tube ruptures.

Optionally, described bendable circuit soft board gets over described transition region and connects with described power sourced electric.

Optionally, described bendable circuit soft board includes multilayer line layer and multilayer dielectric layer, described dielectric layer sequentially interlocks overlapped with described line layer, and described light source is located at the last layer of described multilayer line layer, and is connected with described power sourced electric by the last layer of described multilayer line layer.

Optionally, described bendable circuit soft board is not fixed on the inner peripheral surface of fluorescent tube along the two ends that fluorescent tube is axial.

Optionally, described bendable circuit soft board forms a freedom portion respectively along the two ends that fluorescent tube is axial, and freedom portion is to the internal flexural deformation of fluorescent tube.

Optionally, described power supply can be single body (the most all power supply modules are all integrated in parts), and is located in the lamp holder of fluorescent tube one end；Or power supply can also be divided into two parts, it is referred to as double individual (the most all power supply modules are separately positioned in two parts), and two parts are respectively arranged in the lamp holder of lamp tube ends.

Optionally, described lamp holder includes one for installing the power supply slot of power supply.

Optionally, described power supply one end has a metal ferrule, and lamp holder is provided with the hollow conductive pin for connecting described power supply.

Optionally, described bendable circuit soft board directly with described power solder.

This utility model separately provides a kind of LED straight lamp, including: the lamp holder of described fluorescent tube one end is located at by a fluorescent tube and；One power supply, is located in described lamp holder；One lamp plate, is located in described fluorescent tube, and described lamp plate is provided with at least one light source；By described lamp plate electrical communication between described light source and described power supply；Described power supply comprises a short circuit board and a power supply module, and described lamp plate comprises a long circuit board, and the length of described long circuit board is more than the length of described short circuit board, and described short circuit board and described long circuit board are fitted each other and constituted a circuit board group component.

Preferably, the length of described short circuit board is about 15 millimeters to 40 millimeters, more preferably 19 millimeters to 36 millimeters, and the length of described long circuit board can be 800 millimeters to 2800 millimeters, more preferably 1200 millimeters to 2400 millimeters.The ratio of described short circuit board and long circuit board can be 1:20 to 1:200.

Optionally, described short circuit board is a rigid circuit board, to reach the effect of Power Support module.

Optionally, described power supply module and described long circuit board are all positioned at the surface, phase the same side of described short circuit board, and described power supply module is directly electrically connected with described long circuit board.

Optionally, described power supply module and described long circuit board system lay respectively at described short circuit board back to both side surface, described power supply module is through the line layer electrical connection of described short circuit board and described bendable circuit soft board.

Optionally, described long circuit board comprises a line layer and a dielectric layer, and described power supply module is electrically connected with described line layer through described short circuit board.

Optionally, described long circuit board comprises a line layer and a dielectric layer, and described power supply module is directly electrically connected with described line layer.

Optionally, described power supply module uses vertical mode to be weldingly fixed on above described short circuit board end.

Compared with prior art, the technical solution of the utility model has the advantage that

Further, the design of length lamp holder, the elasticity of Design and machining of products can be increased.

Further, the design of power supply slot in lamp holder, can improve efficiency and convenience that power supply is installed.

Further, through the design of lamp holder stitch, the elasticity of Design and machining of products can be increased.

Further, through the design of lamp holder louvre, the aesthetic appearance of power supply heat sinking problem improving product can be solved.

Lamp plate uses a bendable circuit soft board so that fluorescent tube after rupturing, such as can not keep straight tube state when rupturing in two-section so that user not will be considered that fluorescent tube can also use and go to install voluntarily, thus avoids electric shock accidents.

Further, bendable circuit soft board forms a freedom portion respectively along the two ends that fluorescent tube is axial, and freedom portion, thus can be to promote the convenience of assembly to the internal flexural deformation of fluorescent tube.

Further, bendable circuit soft board is directly welded at the power output end of lamp holder, is less likely to occur fracture during moving.

Further, power supply passes through molectron and the lamp plate electrical communication of a length circuit board, can strengthen its structure and fracture is less likely to occur.

Further, pass through the power supply module utilizing multi-form, the elasticity of Design and machining of products can be increased.

This utility model provides a kind of current rectifying and wave filtering circuit, including: the first rectification circuit, in order to external drive signal is carried out rectification；And filter circuit, couple with described first rectification circuit, in order to the described external drive signal after rectification is filtered.

Optionally, described lamp also includes fluorescent tube, couples with described filter circuit, in order to receive external drive signal；And LED drive module, couple with described filter circuit, in order to the external drive signal after accepting filter luminescence.

Optionally, described filter circuit includes electric capacity and the inductance of parallel connection, described electric capacity and described inductance are coupled between described first pin and the second pin one of them and described first rectification circuit, and the electric capacity of described parallel connection and inductance present maximum to the equiva lent impedance of described external drive signal in a characteristic frequency.

This utility model provides a kind of LED straight lamp, including a fluorescent tube, one first rectification circuit, an entire filter wave circuit, a LED drive module.Described fluorescent tube has the first pin and described second pin to receive an external drive signal.Described first rectification circuit couples described first pin and described second pin, in order to described external drive signal is carried out rectification number.Described filter circuit electrically connects with described first rectification circuit, in order to be filtered the signal after rectification.Described LED drive module electrically connects with described filter circuit, with signal after accepting filter luminescence.

Optionally, described filter circuit includes electric capacity and the inductance of parallel connection, described electric capacity and described inductance are coupled between described first pin and described second pin at least one and the first rectification circuit, and the electric capacity of described parallel connection and inductance present maximum to the equiva lent impedance of described external drive signal in a characteristic frequency.

Optionally, described filter circuit also includes a resistance, is series at described electric capacity in parallel and inductance between the pin coupled with described electric capacity in parallel and inductance and described first rectification circuit.

Optionally, described filter circuit also comprises an EMI electric capacity, is coupled between described first filtering junction point and the described second filtering junction point of full bridge rectifier.

Optionally, described first pin lays respectively at relative two ends of described fluorescent tube with described second pin.

Optionally, described first pin and described second pin are positioned at same one end of described fluorescent tube.

Optionally, described filter circuit also comprises π type filter circuit.

Optionally, the capacitance of the described electric capacity of described filter circuit is between 10nF～2uF.

Optionally, the inductance value of the described inductance of described filter circuit is less than 2mH.

Optionally, described characteristic frequency is between 20kHz-30kHz.

Optionally, described filter circuit includes the filter unit of one or more parallel connection.

Optionally, described filter unit includes that an electric capacity, one end of described electric capacity couple the first rectification output end and the first filtering output end, and the other end couples described second rectification output end and the second filtering output end.

By above-mentioned circuit design, LED straight lamp can be made can to meet EMI specification and UL authentication requesting, and make the voltage quasi position of external drive signal provide after suitable adjustment to LED drive circuit, and avoid too high voltage to damage LED drive circuit.

Optionally, described LED drive module comprises one drive circuit and a LED module, described drive circuit is DC-to-DC switching circuit, signal after described filtering is converted into a driving signal luminous with the described LED module of driving, and makes the current stabilization of described LED module in a predetermined current value.

Optionally, described drive circuit adjusts the size of predetermined current value according to the level of signal after described filtering.

Optionally, the Tuning function system of described predetermined current value is to comprise the quadratic power of the level of signal after described filtering or above function.

Optionally, described predetermined current value lie in described filtering after signal level more than a upper voltage limit value time adjust upward, in or described filtering after signal level less than a voltage lower limit value time adjust downwards, wherein said upper voltage limit value be more than described voltage lower limit value.

Optionally, when described predetermined current value lies in that the level of signal is more than a upper voltage limit value after described filtering, after predetermined current value and described filtering, the slope of curve between the level of signal rises with the level of signal after described filtering and becomes big,

Optionally, when described predetermined current value lies in that the level of signal is less than a voltage lower limit value after described filtering, after predetermined current value and described filtering, the slope of curve between the level of signal declines with the level of signal after described filtering and diminishes.

Optionally, when described predetermined current value lies in after described filtering the level of signal less than a upper voltage limit value and more than a voltage lower limit value, described predetermined current value be increased or decreased with the level of signal after described filtering and linearly increasing or minimizing.By above-mentioned circuit design, LED drive circuit in LED straight lamp can be made to adjust the electric current of LED with the driving force of different electric ballasts, and the overvoltage avoided the driving force of electric ballast and the initial value of LED straight lamp to differ and cause, cross stream or situation under-voltage, undercurrent occurs.

Optionally, described drive circuit comprises inductance, controller, switching switch and the electric capacity of two or more parallel connection, wherein said inductance, described controller and described switching switch be arranged at a first circuit board, the electric capacity of two or more parallel connections be at least partially arranged at a second circuit board.

Optionally, described first end has one first lamp holder, and described second end has one second lamp holder, and described first circuit board is positioned in described first lamp holder, and described second circuit board is positioned in described second lamp holder.

Optionally, the length dimension of described second lamp holder is the 30%-80% of length dimension of described first lamp holder.By above-mentioned circuit and interstructural layout designs, the EMI problem of LED straight lamp can be reduced, and improve the life-span of electric capacity and the reliability of integrated circuit, and reduce lighttight lamp holder length and increase the length of light-transmitting lamp vessel, the light-emitting area of increase fluorescent tube can be made and increase the heat radiation of LED.

Optionally, described rectification circuit comprises a rectification unit and end point change-over circuit, described end points change-over circuit and described rectification unit are series between the first pin and described second pin and described filter circuit, described end points change-over circuit with couple the described half-wave junction point of described rectification unit, the first pin and described second pin, another couples described filter circuit.

Optionally, described external drive signal is provided by instantaneous starting type electric ballast.

Optionally; described LED straight lamp also comprises a protection circuit; detect a voltage and/or an electric current of described LED module; and when the described voltage of described LED module is more than a preset value more than the described electric current of an overpressure value and/or described LED module; enter a guard mode, to clamp down on the described voltage of described LED module.

Optionally; described protection circuit comprises a bleeder circuit; described bleeder circuit produces a dividing potential drop according to a dividing ratios and the described voltage of described LED module and/or described electric current, and when the described electric current of described LED module is more than described preset value, heightens described dividing ratios.

Optionally, described bleeder circuit comprises one first switching switch and one second switching switch, series connection one first resistance and one second resistance respectively, when the described electric current of described LED module is less than described preset value, described first switching switch conduction, described second switching switch cut-off, described dividing ratios is determined by described first resistance, when the described electric current of described LED module is more than described preset value, described first switching switch cut-off, described second switching switch conduction, described dividing ratios is determined by described second resistance.

Optionally, the resistance of described second resistance is more than the resistance of described first resistance.

Optionally, described protection circuit also comprises a voltage clamping circuit and couples described LED module, and described voltage clamping circuit decides whether to clamp down on the described voltage of described LED module according to described dividing potential drop.Optionally, described LED straight lamp also comprises an overvoltage crowbar, couples described filter circuit, equals to or less than a predetermined excess pressure value with the level of signal after clamping down on described filtering.

Optionally, described overvoltage crowbar comprises Zener diode.

A kind of protection circuit; this protection circuit is for detecting a voltage and/or an electric current of LED module; and when the described voltage of described LED module is more than a preset value more than the described electric current of an overpressure value and/or described LED module, enter guard mode, to clamp down on the described voltage of described LED module.

Optionally; described protection circuit comprises bleeder circuit; described bleeder circuit produces a dividing potential drop according to a dividing ratios and the described voltage of described LED module and/or described electric current, and when the described electric current of described LED module is more than described preset value, heightens described dividing ratios.

Optionally, described bleeder circuit comprises the first switching switch and one second switching switch, series connection one first resistance and the second resistance respectively, when the described electric current of described LED module is less than described preset value, described first switching switch conduction, described second switching switch cut-off, described dividing ratios is determined by described first resistance, when the described electric current of described LED module is more than described preset value, described first switching switch cut-off, described second switching switch conduction, described dividing ratios is determined by described second resistance.

Optionally, the resistance of described second resistance is more than the resistance of described first resistance.

Optionally, described protection circuit also comprises voltage clamping circuit and couples described LED module, and described voltage clamping circuit decides whether to clamp down on the described voltage of described LED module according to described dividing potential drop.

Optionally, described LED straight lamp also comprises overvoltage crowbar, couples described filter circuit, equals to or less than a predetermined excess pressure value with the level (i.e. magnitude of voltage) of signal after clamping down on described filtering.

Optionally, described overvoltage crowbar comprises Zener diode.

A kind of lamp, including: the protection circuit described in any of the above-described item；Wherein, described lamp also includes a fluorescent tube, in order to receive an external drive signal；One first rectification circuit, couples described fluorescent tube, in order to described external drive signal is carried out rectification, to produce a rectified signal；One filter circuit, couples with described first rectification circuit, in order to be filtered signal after described rectification, to produce a filtered signal；One LED drive module, couples with described filter circuit, and comprises a LED module, and wherein said LED drive module is configured to receive after described filtering signal and produces a driving signal, and described LED module is in order to receive described driving signal and luminous；Described protection circuit, couples described filter circuit, and is configured to determine whether enter a guard mode, and wherein when entering guard mode, described protection circuit clamps down on level (i.e. magnitude of voltage) size of signal after described filtering.

Optionally, described lamp is LED.

Optionally, described lamp is LED straight lamp.

Optionally, described filter circuit has one first filtering output end and one second filtering output end, described voltage clamping circuit couples described first filtering output end and the second filtering output end, described bleeder circuit couples described voltage clamping circuit, described second filtering output end and a bias generator, wherein said bleeder circuit is configured to receive a current sense signal, and wherein said current sense signal represents the size of current that described LED module flows through.

Optionally, voltage clamping circuit comprises bidirectional triode thyristor and bidirectional trigger diode, and bleeder circuit comprises the first bipolar junction transistors and the second bipolar junction transistors, the first resistance, the second resistance, the 3rd resistance and the 4th resistance；First end of bidirectional triode thyristor couples the first filtering output end, and the second end couples the second filtering output end, and controls end and couple the first end of bidirectional trigger diode；One end of second end coupling capacitance of bidirectional trigger diode, the other end of electric capacity couples the second filtering output end；One end of resistance couples the second end of bidirectional trigger diode, and the other end couples the second filtering output end, and in parallel with electric capacity.One end of first resistance couples the second end of bidirectional trigger diode, and the other end couples the collector of the first bipolar junction transistors；The emitter-base bandgap grading of the first bipolar junction transistors couples the second filtering output end；One end of second resistance couples the second end of bidirectional trigger diode, and the other end couples collector and the base stage of the first bipolar junction transistors of the second bipolar junction transistors；The emitter-base bandgap grading of the second bipolar junction transistors couples the second filtering output end；One end of resistance couples the base stage of the second bipolar junction transistors, one end of other end coupling capacitance.The other end of electric capacity couples the second filtering output end；One end of 4th resistance couples the second end of bidirectional trigger diode, and the other end couples the negative pole of diode.The positive pole of diode couples the first filtering output end.

Optionally, when when described LED straight lamp normal operating, the electric current of described LED module is within normal range, the second bipolar junction transistors cut-off, bidirectional triode thyristor is cut-off, and described protection circuit is in unprotected state.

Optionally, when the electric current of described LED module is more than a preset value, the second bipolar junction transistors conducting, bidirectional triode thyristor is to turn on to clamp down on the voltage difference between the first filtering output end and the second filtering output end, and described protection circuit is in guard mode.

Optionally, described filter circuit provides described bias generator at described first filtering output end, and described protection circuit also comprises a diode, and the positive pole of described diode is coupled to described bias generator, and negative pole is coupled to described bleeder circuit.

Optionally, described filter circuit has one first filtering output end and one second filtering output end, and described protection circuit comprises a voltage clamping circuit and a bleeder circuit, described voltage clamping circuit couples described first filtering output end and the second filtering output end, described bleeder circuit couples described voltage clamping circuit and described second filtering output end, wherein said bleeder circuit is also coupled to the anode of described LED module to detect a voltage of described LED module, and it is configured to receive a current sense signal, wherein said current sense signal represents the size of current that described LED module flows through.

Optionally; when the electric current of described LED module is within normal range; but when the voltage of the anode of described LED module is more than an overpressure value; described bleeder circuit makes described voltage clamping circuit turn between described first filtering output end and the second filtering output end, makes described protection circuit enter described guard mode to clamp down on the voltage difference between described first filtering output end and the second filtering output end.

Optionally; described protection circuit also comprises another electric capacity and another resistance; between another electric capacity described with another resistance described one is connected end and is suitable to receive described current sense signal; the other end of another resistance described couples described bleeder circuit, and the other end of another capacitor described couples described second filtering output end.

Optionally; described protection circuit also comprises an electric capacity; wherein said voltage clamping circuit comprises a bidirectional triode thyristor and a bidirectional trigger diode; one first end of described bidirectional triode thyristor couples described first filtering output end; one second end couples described second filtering output end, and a control end couples one first end of described bidirectional trigger diode；One second end of described bidirectional trigger diode couples one end of described capacitor, and the other end of described capacitor couples described second filtering output end；And described bleeder circuit is coupled to described second end of described bidirectional trigger diode.

Optionally; described protection circuit also comprises an electric capacity; wherein said voltage clamping circuit comprises a thyristor and a bidirectional trigger diode; one first end of described thyristor couples described first filtering output end; one second end couples described second filtering output end, and a control end couples one first end of described bidirectional trigger diode；One second end of described bidirectional trigger diode couples one end of described capacitor, and the other end of described capacitor couples described second filtering output end；And described bleeder circuit is coupled to described second end of described bidirectional trigger diode.

Optionally, described bleeder circuit comprises one first switching switch, one second switching switch, one first resistance, one second resistance；One end of described first resistance couples described second end of described bidirectional trigger diode, and the other end couples described first switching switch；Described first switching switch is also coupled to described second filtering output end；One end of described second resistance couples described second end of described bidirectional trigger diode, and the other end couples described second switching switch and the first switching switch；Described second switching switch is also coupled to described second filtering output end, and is configured to receive described current sense signal.

Optionally, the first bipolar junction transistors and the second bipolar junction transistors as switching switch are connected respectively and are determined the first resistance and second resistance of dividing ratios, whether bleeder circuit is more than preset value according to the electric current of LED module, determine the first bipolar junction transistors and the cut-off whichever conducting of the second bipolar junction transistors whichever, determine dividing ratios；Voltage clamping circuit decides whether to clamp down on the voltage of LED module according to the dividing potential drop of bleeder circuit.

Optionally; the resistance value of described first resistance is less than the resistance value of described second resistance; and when when described LED straight lamp normal operating, the electric current of described LED module is within normal range; described second switching switch is cut-off; described first switching switch is conducting; cause described thyristor to be ended by the current potential of described second end of described bidirectional trigger diode, make described protection circuit not enter described guard mode.

Optionally; the resistance value of described first resistance is less than the resistance value of described second resistance; and when the electric current of described LED module is more than a preset value; described second switching switch conduction; described first switching switch is cut-off; cause described thyristor to be turned on by the current potential of described second end of described bidirectional trigger diode, make described protection circuit enter described guard mode to clamp down on the voltage difference between described first filtering output end and the second filtering output end.

Optionally, it is in parallel with the two ends of described 3rd resistance that described protection circuit also has Zener diode, in order to clamp down on the voltage at described two ends.

Optionally; the resistance value of described first resistance is less than the resistance value of described second resistance; and when the electric current of described LED module is within normal range; but when the voltage of the anode of described LED module is more than an overpressure value; described second switching switch is conducting; described first switching switch is cut-off; cause described thyristor to be turned on by the current potential of described second end of described bidirectional trigger diode, make described protection circuit enter described guard mode to clamp down on the voltage difference between described first filtering output end and the second filtering output end.

Optionally; the resistance value of described first resistance is less than the resistance value of described second resistance; and when the electric current of described LED module is within normal range; and the voltage of the anode of described LED module less than an overpressure value time; described second switching switch is cut-off; described first switching switch is conducting, causes described thyristor to be ended by the current potential of described second end of described bidirectional trigger diode, makes described protection circuit not enter described guard mode.

Optionally; described filter circuit has one first filtering output end and one second filtering output end; and described protection circuit comprises a diode; couple described first filtering output end and the second filtering output end; wherein said diode has a threshold voltage, and is suitable to when after described filtering, the level of signal turns on when reaching described threshold voltage.

Optionally, this lamp also comprises an anti-flicker circuit, be coupled between described filter circuit and described LED drive module, in order to receive and to consume the portion of energy of signal after described filtering, with suppression or after avoiding described filtering the ripple of signal cause the light-emitting flash of described LED drive module.

Optionally, described filter circuit has one first filtering output end and one second filtering output end, and described anti-flicker circuit comprises at least one resistance, and described at least one resistance is coupled between described first filtering output end and described second filtering output end.

By above-mentioned circuit design, can avoid LED drive circuit because of driving voltage or electric current overrun (such as: the driving signal that different electric ballasts provide is different, the problem that part is likely to result in overtension) damage LED drive circuit.

Accompanying drawing explanation

Fig. 1 is an axonometric chart, the LED straight lamp of display this utility model one embodiment；

Figure 1A is an axonometric chart, and the lamp holder of the lamp tube ends of the LED straight lamp of display another embodiment of this utility model has different size；

Fig. 2 is a three-dimensional exploded view, the LED straight lamp of display Fig. 1；

Fig. 3 is an axonometric chart, the front portion of the lamp holder of the LED straight lamp of display this utility model one embodiment and top；

Fig. 4 is an axonometric chart, the bottom of the lamp holder of the LED straight lamp of display Fig. 3；

Fig. 5 is an axonometric chart, the another holder structure in display this utility model another embodiment LED straight lamp；

Fig. 6 is a section plan, and the lamp plate of LED straight lamp of display this utility model one embodiment is bendable circuit soft board and its end gets over the transition part of fluorescent tube and is welded to connect with the outfan of power supply；

Fig. 7 is a section plan, the bendable circuit soft board tool double-decker of the lamp plate of display this utility model one embodiment LED straight lamp；

Fig. 8 is an axonometric chart, the pad being welded to connect with the printed circuit board (PCB) with power supply of the bendable circuit soft board of the lamp plate of display this utility model one embodiment LED straight lamp；

Fig. 9 is a plane graph, the pad configuration of the bendable circuit soft board of the lamp plate of display this utility model one embodiment LED straight lamp；

Figure 10 is a plane graph, the bendable circuit soft board of lamp plate of display another embodiment LED straight lamp of this utility model have 3 in string pad side by side；

Figure 11 is a plane graph, and the bendable circuit soft board of the lamp plate of display this utility model another embodiment LED straight lamp has 3 pads arranged side by side in two；

Figure 12 is a plane graph, the bendable circuit soft board of lamp plate of display this utility model another embodiment LED straight lamp have 4 in string the pad of pad side by side；

Figure 13 is a plane graph, and the bendable circuit soft board of display this utility model still lamp plate of an embodiment LED straight lamp has 4 pads arranged side by side in two；

Figure 14 is a plane graph, and the pad of the bendable circuit soft board of the lamp plate of display this utility model one embodiment LED straight lamp has hole；

Figure 15 is a section plan, and display utilizes the welding process of the pad of the bendable circuit soft board of the lamp plate of Figure 14 and the printed circuit board (PCB) of power supply；

Figure 16 is a section plan, and display utilizes the welding process of the pad of the bendable circuit soft board of the lamp plate of Figure 14 and the printed circuit board (PCB) of power supply, and wherein the hole on pad is near the edge of bendable circuit soft board；

Figure 17 is a plane graph, and the pad of the bendable circuit soft board of the lamp plate of display this utility model one embodiment LED straight lamp has breach；

Figure 18 is a section plan, display enlarged local section of A-A' line along Figure 17；

Figure 19 is an axonometric chart, and the bendable circuit soft board of lamp plate of display another embodiment LED straight lamp of this utility model is combined into a circuit board assemblies with the printed circuit board (PCB) of power supply；

Figure 20 is an axonometric chart, another configuration of the circuit board assemblies of display Figure 19；

Figure 21 is an axonometric chart, the power supply in display this utility model one embodiment LED straight lamp；

Figure 22 is an axonometric chart, and in display another embodiment LED straight lamp of this utility model, the circuit board of power supply is vertically soldered on the rigid circuit board of aluminum；

Figure 23 is an axonometric chart, in display another embodiment of this utility model, and the double-deck line layer of bendable circuit soft board tool of lamp plate；

Figure 24 A is the application circuit block schematic diagram of the power supply module of the LED straight lamp according to this utility model the first preferred embodiment；

Figure 24 B is the application circuit block schematic diagram of the power supply module of the LED straight lamp according to this utility model the second preferred embodiment；

Figure 24 C is the circuit box schematic diagram of the LED according to this utility model the first preferred embodiment；

Figure 25 A is the application circuit block schematic diagram of the power supply module of the LED according to this utility model the 4th preferred embodiment；

Figure 25 B is the circuit diagram of the anti-flicker circuit according to this utility model one preferred embodiment；

Figure 26 A is the application circuit block schematic diagram of the power supply module of the LED according to this utility model the 5th preferred embodiment；

Figure 26 B is the circuit diagram of the protection circuit according to this utility model one preferred embodiment；

Figure 27 A is the application circuit block schematic diagram of the power supply module of the LED straight lamp according to this utility model the 16th preferred embodiment；

Figure 27 B is the circuit diagram of the overvoltage crowbar according to this utility model preferred embodiment.

Detailed description of the invention

This utility model is on the basis of glass lamp, it is proposed that a kind of new LED straight lamp, to solve problem and the problems referred to above of mentioning in background technology.Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with the accompanying drawings specific embodiment of the utility model is described in detail.The narration of each embodiment of following this utility model, merely to illustrate and be illustration, is not meant as whole embodiment of the present utility model or this utility model is limited to specific embodiment.

Refer to Fig. 1 and Fig. 2, this utility model provides a kind of LED straight lamp in an embodiment, comprising: the lamp plate 2 that a fluorescent tube 1, is located in fluorescent tube 1, and it is respectively arranged on two lamp holders 3 at fluorescent tube 1 two ends.Fluorescent tube 1 can use plastics fluorescent tube or glass lamp, the size of described lamp holder to be identical or different.Refer to Figure 1A, in the embodiment that the size of described lamp holder differs, it is preferable that size is relatively headlight area of bed the 30% to 80% of described less lamp holder.

In one embodiment, the fluorescent tube 1 of LED straight lamp uses the glass lamp of tool reinforced structure, to avoid traditional glass lamp easily rupturable and to rupture causing the problem of electric shock accidents because of electric leakage, and the problem that plastic lantern is the most aging.In each embodiment of this utility model, it is possible to use glass fluorescent tube 1 is done secondary operations strengthening by chemical mode or physics mode.

Refer to Fig. 3 and Fig. 4, in this utility model one embodiment, the lamp holder 3 of LED straight lamp includes an insulation tube 302, and one is fixedly arranged on the heat-conducting part 303 on insulation tube 302 outer peripheral face, and two the hollow conductive pins 301 being located on insulation tube 302.Described heat-conducting part 303 can be the becket of a tubulose.

When making LED straight lamp, after the end region 101 of fluorescent tube 1 is inserted in lamp holder 3, the end region 101 of fluorescent tube 1 insert the axial length of lamp holder 3 part account for heat-conducting part 303 axial length 2/1 to three/3rds between, such benefit is: on the one hand, ensure that hollow conductive pin 301 has enough creep age distances with heat-conducting part 303, be difficult to short circuit both during energising and make people get an electric shock and initiation potential；On the other hand, due to the insulating effect of insulation tube 302 so that the creep age distance between hollow conductive pin 301 and heat-conducting part 303 strengthens, it is easier to make people get an electric shock and the test of initiation potential during by high voltage.

Refer to Fig. 5 and Figure 22, in another embodiment, the end of lamp holder 3 ' is provided with a projection 312, and the top of projection 312 offers hole, and its outer rim is provided with the groove 314 that a degree of depth is 0.1 ± 1%mm and is available for conductive pin 53 and positions.Conductive pin 53 is after passing the hole of lamp holder 3 ' end projection 312, bent it is placed on groove 314, projection 312 is covered the most again with a conducting metal cap 311, so, then conductive pin 53 can be fixed between projection 312 and conducting metal cap 311, in the present embodiment, the internal diameter of conducting metal cap 311 for example, 7.56 ± 5%mm, and the external diameter of projection 312 for example, 7.23 ± 5%mm, and conductive pin 53 external diameter for example, 0.5 ± 1%mm, therefore conducting metal cap 311 can directly close over firmly projection 312 without the most additionally coating viscose, so just can complete the electrical connection of power supply 5 and conducting metal cap 311.

Refer to Fig. 2,3,12,13, in other embodiments, lamp holder provided by the utility model is provided with the hole 304 for heat radiation.Thereby, make way for the heat that power supply module within lamp holder produces to disperse and be in the condition of high temperature inside lamp holder without causing, to avoid the reliability of lamp holder inner member to decline.Further, hole lamp holder being used for heat radiation is arc.Further, hole lamp holder being used for heat radiation is three camber lines not of uniform size.Further, hole lamp holder being used for heat radiation is ascending three camber lines gradually changed.Further, on lamp holder, the hole for heat radiation can be above-mentioned arc, and the arbitrarily collocation of camber line is constituted.

In other embodiments, lamp holder includes one for installing the power supply slot (not shown) of power supply module.

In other embodiments; the width of bendable circuit soft board can be widened, and owing to circuit board surface includes the circuit protecting layer of ink material, and ink material has the effect of reflection light; therefore at the position widened, circuit board itself just can play such as the effect of reflectance coating 12 function.Preferably, bendable circuit soft board is 0.3 to 0.5 along the proportion between circumferentially extending length and the girth of described fluorescent tube 2 inner peripheral surface of fluorescent tube 2.A circuit protecting layer can be coated with outside bendable circuit soft board; circuit protecting layer can be a kind of ink material; having the function increasing reflection, the bendable circuit soft board widened is with light source for starting point to circumferentially extending, and the light of light source can make light more concentrate by the position widened.

Further, any one during lamp plate 2 can be strip aluminium base, FR4 plate or bendable circuit soft board.Owing to the fluorescent tube 1 of the present embodiment is glass lamp, if lamp plate 2 uses strip aluminium base or the FR4 plate of rigidity, so rupture when fluorescent tube, such as after breaking in two, whole fluorescent tube is still able to remain the state of straight tube, at this moment user likely will be considered that LED straight lamp can also use and go to install voluntarily, is easily caused electric shock accidents.Owing to bendable circuit soft board has stronger pliability and flexible characteristic, solve the situation that rigid strip aluminium base, FR4 plate pliability and bendability are not enough, therefore the lamp plate 2 of the present embodiment uses bendable circuit soft board, so after fluorescent tube 1 ruptures, i.e. cannot support the fluorescent tube 1 ruptured to continue to remain straight tube state, to inform that user LED straight lamp can not use, it is to avoid the generation of electric shock accidents.Therefore, after using bendable circuit soft board, electric shock problem that is broken due to glass tubing and that cause can be alleviated to a certain extent.Following example i.e. explain using bendable circuit soft board as lamp plate 2.

Refer to Fig. 7, the bendable circuit soft board as lamp plate 2 includes one layer of line layer 2a with conductive effect, and light source 202 is located on line layer 2a, is connected with power sourced electric by line layer 2a.With reference to Fig. 7, in the present embodiment, bendable circuit soft board can also include one dielectric layer 2b, overlapped with line layer 2a, and the area equation of dielectric layer 2b and line layer 2a, line layer 2a is used for arranging light source 202 on the surface opposing with dielectric layer 2b.Line layer 2a is electrically connected to power supply 5 in order to allow DC current pass through.Dielectric layer 2b is then adhered on the inner peripheral surface of fluorescent tube 1 by bonding agent sheet 4 on the surface opposing with line layer 2a.Wherein, line layer 2a can be metal level, or is furnished with the bus plane of wire (such as copper cash).

In other embodiments, the outer surface of line layer 2a and dielectric layer 2b can be coated with a circuit protecting layer, and described circuit protecting layer can be a kind of ink material, has welding resistance and increases the function of reflection.Or, bendable circuit soft board can be a Rotating fields, is i.e. only made up of a sandwich circuit layer 2a, then in the circuit protecting layer of one layer of above-mentioned ink material of Surface coating of line layer 2a.Whether a sandwich circuit layer 2a structure or two-layer structure (a sandwich circuit layer 2a and one dielectric layer 2b) can coupled circuit protective layers.Circuit protecting layer the most only can also arrange circuit protecting layer in the side with light source 202 in the side surface configuration of bendable circuit soft board.It should be noted that, bendable circuit soft board is a sandwich circuit Rotating fields 2a or is two-layer structure (a sandwich circuit layer 2a and one dielectric layer 2b), substantially ratio general three layers of flexible base board (pressing from both sides one dielectric layer in two sandwich circuit layers) more pliability and flexibility, therefore, can arrange in pairs or groups (such as: non-straight lamp) with having special formed fluorescent tube 1, and bendable circuit soft board is close on fluorescent tube 1 tube wall.Additionally, bendable circuit soft board is close to tube wall for preferably to configure, and the number of plies of bendable circuit soft board is the fewest, then radiating effect is the best, and material cost is the lowest, more environmentally friendly, and pliable and tough effect also has an opportunity to promote.

Certainly, bendable circuit soft board of the present utility model is not limited in one layer or double layer circuit plate, in other embodiments, bendable circuit soft board includes multilayer line layer 2a and multilayer dielectric layer 2b, dielectric layer 2b and line layer 2a can sequentially interlock overlapped and be located at the line layer 2a side opposing with light source 202, light source 202 is located at the last layer of multilayer line layer 2a, is connected with power sourced electric by the last layer of line layer 2a.In other embodiments, the length as the bendable circuit soft board of lamp plate 2 is more than the length of fluorescent tube.

Refer to Figure 23, in one embodiment, bendable circuit soft board as lamp plate 2 the most sequentially includes a first line layer 2a, one dielectric layer 2b and one second line layer 2c, the thickness of the second line layer 2c thickness more than first line layer 2a, the length of lamp plate 2 is more than the length of fluorescent tube 1, wherein in the stub area that lamp plate 2 is not provided with light source 202 and protrudes from fluorescent tube 1, first line layer 2a and the second line layer 2c is respectively through two through hole 203 and 204 electrical communication, but through hole 203 and 204 does not the most connect to avoid short circuit.

Thereby mode, owing to the second line layer 2c thickness is relatively big, can play support first line layer 2a and the effect of dielectric layer 2b, allows lamp plate 2 be not likely to produce skew or deformation when being attached on the inner tubal wall of fluorescent tube 1, to promote fine ratio of product simultaneously.Additionally, first line layer 2a and the second line layer 2c is electrically connected logical so that the circuit layout on first line layer 2a can extend to the second line layer 2c, make the circuit layout on lamp plate 2 the most polynary.Furthermore, circuit location wiring originally becomes double-deck from monolayer, and the line layer monolayer area on lamp plate 2, that is the size on width can reduce further, and the lamp plate quantity allowing batch carry out die bond can increase, and promote productivity ratio.

Further, light source 202 and the first line layer 2a protruding from the stub area of fluorescent tube 1 and the second line layer 2c it is not provided with on lamp plate 2, also can directly be utilized to realize the circuit layout of power supply module, and allow power supply module directly be arranged on bendable circuit soft board and be achieved.

Continuing referring to Fig. 2, lamp plate 2 is provided with some light sources 202, is provided with power supply 5 in lamp holder 3, by lamp plate 2 electrical communication between light source 202 and power supply 5.In each embodiment of this utility model, power supply 5 can be single body (the most all power supply modules are all integrated in parts), and is located in the lamp holder 3 of fluorescent tube 1 one end；Or power supply 5 can also be divided into two parts, it is referred to as double individual (the most all power supply modules are separately positioned in two parts), and two parts is respectively arranged in the lamp holder 3 of lamp tube ends.If strengthening section process is made in fluorescent tube 1 only one end, power supply prioritizing selection is single body, and is located in the lamp holder 3 corresponding to the end region after strengthening 101.

No matter it is single body or double individuality, the generation type of power supply can have Mutiple Choice, such as, power supply can be the module after a kind of embedding molding, specifically, uses the silica gel (heat conductivity >=0.7w/m k) of a kind of high heat conduction, by mould, power supply module is carried out embedding molding, obtain power supply, the advantage that the power supply that this mode obtains has high insulation, height dispels the heat, profile is more regular, and can coordinate with other structural members easily.Or, exposed power supply module directly can also be inserted inside lamp holder by power supply for not make casting glue molding, or after the exposed power supply module conventional thermal draw is encased, then it is internal to insert lamp holder 3.In other words, in each embodiment of this utility model, power supply 5 can be the form appearance carrying power supply module as shown in Figure 7 with monolithic printed circuit board (PCB), also can be to occur with the form of single module as shown in figure 21.

Refer to Fig. 2 and combine Figure 21, in an embodiment, one end of power supply 5 has male plug 51, and the other end has metal ferrule 52, and the end of lamp plate 2 is provided with female plug 201, and lamp holder 3 is provided with the hollow conductive pin 301 for connecting external power source.The male plug 51 of power supply 5 is inserted in the female plug 201 of lamp plate 2, and metal ferrule 52 is inserted in the hollow conductive pin 301 of lamp holder 3.Now male plug 51 and female plug 201 are equivalent to adaptor, for power supply 5 and lamp plate 2 being electrically connected.After metal ferrule 52 inserts in hollow conductive pin 301, impact hollow conductive pin 301 through outside stamping tool so that hollow conductive pin 301 occurs slight deformation, thus fixes the metal ferrule 52 on power supply 5, and realize electrical connection.During energising, electric current passes sequentially through hollow conductive pin 301, metal ferrule 52, male plug 51 and female plug 201 and arrives lamp plate 2, and arrives light source 202 by lamp plate 2.But, the structure of power supply 5 is then not limited to modular pattern shown in Figure 21.Power supply 5 can be a printed circuit board (PCB) being loaded with power supply module, then is electrically connected with lamp plate 2 by the connected mode of male plug 51, female plug 201.

In other embodiments, electric connection between power supply 5 and the lamp plate 2 of any pattern can also replace above-mentioned male plug 51 and female plug 201 by conventional wires routing mode, i.e. using a traditional plain conductor, electrically connected with power supply one end of plain conductor, the other end electrically connects with lamp plate 2.Further, plain conductor can be coated with an insulated sleeve to protect user to avoid getting an electric shock.But the mode that wire routing connects likely has the problem of fracture in transportation, slightly worse in quality.

In other embodiments, the electric connection between power supply 5 with lamp plate 2 can by rivet nail joint, tin cream gluing, weld or with wire binding by the way of be directly linked together.Consistent with the fixed form of aforementioned lamp plate 2, a side surface of bendable circuit soft board is bonded and fixed to the inner peripheral surface of fluorescent tube 1 by bonding agent sheet 4, and the two ends of bendable circuit soft board can select fixing or not be fixed on the inner peripheral surface of fluorescent tube 1.

If the two ends of bendable circuit soft board are fixed on the inner peripheral surface of fluorescent tube 1, then pay the utmost attention to arrange female plug 201 on bendable circuit soft board, then the male plug 51 of power supply 5 is inserted female plug 201 and realizes electrical connection.

If lamp plate 2 is not fixed on the inner peripheral surface of fluorescent tube 1 along the two ends that fluorescent tube 1 is axial, if using wire to connect, during follow-up moving, due to two ends freely, it is susceptible to rock during follow-up moving, thus makes it possible to wire and rupture.Therefore lamp plate 2 with the connected mode prioritizing selection of power supply 5 for welding.Specifically, with reference to Fig. 6, it is welded on the outfan of power supply 5 after can directly lamp plate 2 be got over the transition region 103 of strengthening section structure, removes the use of wire from, improve the stability of product quality.Now lamp plate 2 need not arrange female plug 201, and the outfan of power supply 5 is also without arranging male plug 51.

As shown in Figure 8, the concrete practice can be that the outfan of power supply 5 is reserved power pad a, and on power pad a, stay stannum so that the thickness of stannum on pad increases, convenient welding, accordingly, the end of lamp plate 2 also reserves light source pad b, and the light source pad b of the power pad a of power supply 5 outfan with lamp plate 2 is welded together.It is front by the plane definition at pad place, then lamp plate 2 docks the most firm with the connected mode of power supply 5 with the pad in both fronts, but it is pressed in the back side of lamp plate 2 when welding for welding pressure head typical case, scolding tin is heated across lamp plate 2, the problem being easier reliability occurs.If as shown in figure 14, will output hole in the middle of the light source pad b in lamp plate 2 front, then faced up to be superimposed upon on the power pad a in power supply 5 front and weld, then scolding tin heating can directly be melted by welding pressure head, to being relatively easy to realization on Practical Operation.

As shown in Figure 8, in above-described embodiment, bendable circuit soft board major part as lamp plate 2 is fixed on the inner peripheral surface of fluorescent tube 1, it is not only to be fixed on the inner peripheral surface of fluorescent tube 1 at two ends, the lamp plate 2 not being fixed on fluorescent tube 1 inner peripheral surface forms a freedom portion 21, and lamp plate 2 is fixed on the inner peripheral surface of fluorescent tube 1.Freedom portion 21 has above-mentioned pad b.When assembling, one end of freedom portion 21 and power supply 5 welding can drive freedom portion 21 to fluorescent tube 1 internal contraction.It should be noted that, when the bendable circuit soft board as lamp plate 2 has the structure that two sandwich circuit layer 2a and 2c press from both sides a dielectric layer 2b as shown in figure 23, aforementioned lamp plate 2 is not provided with light source 202 and protrudes from the stub area of fluorescent tube 1 and as freedom portion 21, and freedom portion 21 can be allowed to realize connection and the circuit layout of power supply module of two sandwich circuit layers.

In the present embodiment, when lamp plate 2 and power supply 5 connect, the surface, light source 202 place on pad b and a and lamp plate in the same direction, and is formed with through hole e as shown in figure 14 on the pad b on lamp plate 2 so that pad b and pad a is interconnected.When the freedom portion 21 of lamp plate 2 deforms towards the internal contraction of fluorescent tube 1, the welded connection between printed circuit board (PCB) and the lamp plate 2 of power supply 5 has a lateral pulling force to power supply 5.Further, compared to the aspectant situation of pad b system on the pad a of power supply 5 and lamp plate 2, the welded connection between printed circuit board (PCB) and the lamp plate 2 of power supply 5 here also has a downward pulling force to power supply 5.This downward pulling force comes from the solder in through hole e and forms one between power supply 5 and lamp plate 2 and more strengthen and be firmly electrically connected with.

As it is shown in figure 9, the light source pad b of lamp plate 2 is two unconnected pads, electrically connecting with light source 202 both positive and negative polarity respectively, the size of pad is about 3.5 × 2mm², the printed circuit board (PCB) of power supply 5 also has pad corresponding thereto, being arranged above of pad is easy to weld board automatic welding and have reserved stannum, and the thickness of stannum can be 0.1 to 0.7mm, and preferred values is that 0.3 to 0.5mm is more appropriate, is optimal with 0.4mm.One insulation hole c can be set between two pads, two pads are avoided to cause electrical short during welding because scolding tin is welded together, the rear of this external insulated hole hole c also can arrange location hole d, is used for the tram allowing automatic welding board can correctly judge light source pad b.

The light source pad b of lamp plate at least one, electrically connects with light source 202 both positive and negative polarity respectively.In other embodiments, in order to be able to reach the extendibility in compatible and follow-up use, the quantity of light source pad b can have more than one, such as 2,3,4 or more than 4.When pad only has 1, corresponding two ends of lamp plate all can electrically connect with power supply respectively, to form primary Ioops, now may utilize the substituted mode of electronic building brick, such as: replaces electric capacity as current stabilization assembly with inductance.If Figure 10 is to shown in 12, when pad is 3, the 3rd pad can serve as ground connection and use, and when pad is 4, the 4th pad can be used to make signal input end.Accordingly, power pad a is also identical with light source pad b quantity.When pad is more than 3, the arrangement between pad can be that string side by side or lines up two row, configuring in position according to accommodating size time actually used, causing short circuit as long as the most not electrically connecting.In other embodiments, if by part circuit production on bendable circuit soft board, light source pad b can be independent one, and number of pads is the fewest, more saves flow process in technique；The more, the electrical connection of bendable circuit soft board and power output end is fixing more to be strengthened number of pads.

As shown in figure 14, in other embodiments, the inside of light source pad b can have the structure of welding perforation e, and the diameter of welding perforation e can be 1 to 2mm, preferably 1.2 to 1.8mm, most preferably 1.5mm, and the least, the stannum welded is difficult to pass through.When the power pad a of the power supply 5 and light source pad b of lamp plate 2 welds together, the stannum of welding can be through described welding perforation e, then it is deposited in cooling above welding perforation e to condense, form the ball structure g having more than welding perforation e diameter, it seems the function of nail that this ball structure g can play, in addition to fixing through the stannum between power pad a and light source pad b, more can strengthen the firm fixed of electric connection because of the effect of ball structure g.

As shown in Figure 15 to Figure 16, in other embodiments, when the edge of the welding perforation e distance lamp plate 2 of light source pad b is less than or equal to 1mm, the stannum of welding can be deposited in hole top edges through described hole e, too much stannum also can reflux from the edge of lamp plate 2 toward lower section, then being coagulated together with the stannum on power pad a, its structure similarly is that lamp plate 2 is followed closely on the circuit board of power supply 5 by a rivet firmly, has reliable electricity connection function.As shown in FIG. 17 and 18, in other embodiments, welding breach f instead of welding perforation e, the welding perforation of pad is at edge, the stannum of welding electrically connects power pad a and light source pad b fixing through described welding breach f, stannum is easier to climb up light source pad b and is deposited in around welding breach f, has more stannum and form the soldered ball having more than welding breach f diameter after cooling condenses, and this ball structure can allow the crystallized ability of electric connection structure strengthen.In the present embodiment, because the design of welding breach, it seems the function of C-shaped nail that the stannum of welding plays.

The welding perforation of pad is whether initially formed, or directly punches with welding pressure head or title thermal head during welding, can reach the structure described in the present embodiment.Described welding its surface contacted with scolding tin of pressure head can be plane, concave surface, convex surface or these combinations；And described welding pressure head can be strip or latticed for limiting the surface of object to be welded such as lamp plate 2, perforation is not exclusively covered by the described surface contacted with scolding tin, guarantee that scolding tin can pass from perforation, when scolding tin pass welding perforation be deposited in welding perforation around time, recess is provided that the accommodating position of soldered ball.In other embodiments, the bendable circuit soft board as lamp plate 2 has a hole, location, can be positioned accurately by the pad of power pad a and light source pad b through hole, location when welding.

Refer to Fig. 9, lamp plate 2 also has pad corresponding thereto on the printed circuit board (PCB) of power supply 5, being arranged above of pad is easy to weld board automatic welding and have reserved stannum, it is however generally that the thickness preferred values of stannum is that lamp plate 2 then can be firmly welded on the printed circuit board (PCB) of power supply 5 by 0.3 to 0.5mm.

Refer to Figure 19 and Figure 20, in other embodiments, the above-mentioned lamp plate 2 fixing through welding manner and power supply 5 can be with circuit board group component 25 replacements being equipped with power supply module 250.Circuit board group component 25 has long circuit board 251 and a short circuit board 253, and long circuit board 251 and short circuit board 253 are fitted each other and fixed through gluing mode, and short circuit board 253 is positioned at long circuit board 251 adjacent peripheral edges.On short circuit board 253, there is power supply module 25, be monolithically fabricated power supply.The short circuit board 253 longer circuit board of material 251 is hard, to reach the effect of Power Support module 250.

Long circuit board 251 can be the above-mentioned bendable circuit soft board as lamp plate 2 or flexible base board, and has the line layer 2a shown in Fig. 7.The mode of the line layer 2a of lamp plate 2 and power supply module 250 electrical connection can have different electric connection mode according to actually used situation.As shown in figure 19, the line layer 2a being electrically connected with power supply module 250 being all positioned at by power supply module 250 and long circuit board 251 the same side of short circuit board 253, power supply module 250 is directly electrically connected with long circuit board 251.As shown in figure 20, the line layer 2a system being electrically connected with power supply module 250 being laid respectively at by power supply module 250 and long circuit board 251 both sides of short circuit board 253, power supply module 250 penetrates the line layer 2a electrical connection of too short circuit board 253 and lamp plate 2.

As shown in figure 19, in one embodiment, circuit board group component 25 eliminates the situation that in previous embodiment, the mode of lamp plate 2 and power supply 5 welding is fixed, but first long circuit board 251 and short circuit board 253 gluing is fixed, then is electrically connected by the line layer 2a of power supply module 250 and lamp plate 2.Additionally, lamp plate 2 is not limited in one layer or double layer circuit plate as above-mentioned, can be the most also to comprise another sandwich circuit layer 2c.Light source 202 is located at line layer 2a, by line layer 2a and power supply 5 electrical communication.As shown in figure 20, in another embodiment, circuit board group component 25 has long circuit board 251 and a short circuit board 253, long circuit board 251 can be bendable circuit soft board or the flexible base board of above-mentioned lamp plate 2, lamp plate 2 includes an a line layer 2a and dielectric layer 2b, first by affixed with connecting method to dielectric layer 2b and short circuit board 253, afterwards, then line layer 2a is attached on dielectric layer 2b and extends on short circuit board 253.Various embodiments above, all without departing from the range of application of this utility model circuit board group component 25.

In the various embodiments described above, the length of short circuit board 253 is about 15 millimeters to 40 millimeters, preferably 19 millimeters to 36 millimeters, and the length of long circuit board 251 can be 800 millimeters to 2800 millimeters, preferably 1200 millimeters to 2400 millimeters.The ratio of short circuit board 253 and long circuit board 251 can be 1:20 to 1:200.

In addition, in the foregoing embodiments, when lamp plate 2 and power supply 5 are to fix through welding manner, the end of lamp plate 2 is not secured on the inner peripheral surface of fluorescent tube 1, power supply 5 cannot be supported by the fixing of safety, in other embodiments, if power supply 5 must be fixed in the lamp holder of fluorescent tube 1 end region separately, then lamp holder can be relatively long and have compressed the effective light-emitting area of fluorescent tube 1.

Refer to Figure 22, in one embodiment, the lamp plate used is the rigid circuit board of aluminum 22, because its end can be relatively fixed in the end region of fluorescent tube 1, power supply 5 then uses the mode being perpendicular to rigid circuit board 22 to be weldingly fixed on above rigid circuit board 22 end, one enforcement being easy to welding procedure, two carry out lamp holder 3 need not to have the space that be enough to carry the total length of power supply 5 and can shorten length, so can increase the effective light-emitting area of fluorescent tube.Additionally, in the foregoing embodiments, on power supply 5 in addition to being equiped with power supply module, in addition it is also necessary to welding plain conductor forms electrical connection with the hollow conductive pin 301 of lamp holder 3 separately.In the present embodiment, can be used directly on power supply 5, the conductive pin 53 as power supply module is electrically connected with lamp holder 3, is not required to additionally weld other wire again, also helps the simplification of processing procedure.

It should be noted that the thickness of the second line layer of the flexible circuit board with bilayer conductive layer is preferably thick compared to the thickness of first line layer, thereby can reduce the line loss (pressure drop) on positive wire and negative wire.Furthermore, there is the flexible circuit board flexible circuit board compared to single metal layer of bilayer conductive layer, owing to the positive wire at two ends, negative wire are moved to the second layer, the width of flexible circuit board can be reduced.On identical tool, the discharge quantity of narrower substrate, more than wider substrate, therefore can improve the production efficiency of LED module.And have the flexible circuit board of bilayer conductive layer relatively on be relatively easy to maintain shape, to increase the reliability produced, such as: the accuracy of welding position during the welding of LED component.

Deformation as such scheme, this utility model also provides for a kind of LED straight lamp, at least part of electronic building brick of the power supply module of this LED straight lamp is arranged on lamp plate: i.e. utilize PEC (printed electronic circuit, PEC:Printed Electronic Circuits), technology is by least part of electronic building brick printing or is embedded on lamp plate.

In an embodiment of the present utility model, the electronic building brick of power supply module is provided entirely on lamp plate.Its manufacturing process is as follows: substrate prepares (flexible printed circuit preparations) → spray printing metal nano ink → spray printing passive block/active device (power supply module) → dryings/sintering → spray printing interlayer connection projection → spray insulation ink → spray printing metal nano ink → spray printing passive block and active device (the like formation comprised multi-layer sheet) → sprayed surface welded disc → spraying solder resist and welds LED component.

In above-mentioned the present embodiment, if be provided entirely on lamp plate by the electronic building brick of power supply module, only need to be connected the pin of LED straight lamp by welding lead at the two ends of lamp plate, it is achieved pin and the electrical connection of lamp plate.Thus again substrate need not be set for power supply module, and then can further optimize the design of lamp holder.It is also preferred that the left power supply module is arranged on the two ends of lamp plate, reduce the heat impact on LED component that its work produces the most as far as possible.The present embodiment, because reducing welding, improves the overall reliability of power supply module.

If part electronic building brick is printed on lamp plate (such as resistance, electric capacity), and by big device such as: inductance, the electronic building brick such as electrochemical capacitor is arranged in lamp holder.The manufacturing process of lamp plate is ibid.So by by part electronic building brick, it is arranged on lamp plate, rational layout power supply module, optimizes the design of lamp holder.

As above-mentioned scheme deformation, it is possible to realize being arranged on lamp plate the electronic building brick of power supply module by the way of embedding.That is: in the way of embedding, on pliability lamp plate, embed electronic building brick.It is also preferred that the left the methods such as the ink that the copper coated foil plate (CCL) containing resistor-type/capacitor type or silk screen printing are relevant can be used to realize；Or use inkjet technology to realize the method embedding passive block, i.e. using ink-jet printer directly on the position set in as the electrically conductive ink of passive block and correlation function ink jet-printing to lamp plate.As the deformation of such scheme, passive block can also ink-jet printer directly using on as the electrically conductive ink of passive block and correlation function ink jet-printing to lamp plate).Then, through UV optical processing or drying/sintering processes, the lamp plate of potting passive block is formed.It is embedded in electronic building brick on lamp plate and includes resistance, electric capacity and inductance；In other embodiments, active block is also suitable.Carry out rational layout power supply module by such design and then reach to optimize the design of lamp holder (owing to part uses embedded resistance and electric capacity, the present embodiment has saved the printed circuit board surface space of preciousness, reduces the size of printed circuit board (PCB) and decreases its weight and thickness.Simultaneously because eliminate the pad (pad is the part being easiest to introduce fault on printed circuit board (PCB)) of these resistance and electric capacity, the reliability of power supply module have also been obtained raising.The length of printed circuit board (PCB) upper conductor will be shortened and allow greater compactness of device layout simultaneously, thus improve electric property).

Coordinate Figure 19 and Figure 20, short circuit board 253 is distinguished into the first short circuit board and the second short circuit board being connected with long circuit board 251 two ends, and on the first short circuit board of short circuit board 253 of being respectively set at of the electronic building brick in power supply module and the second short circuit board.The length dimension of the first short circuit board and the second short circuit board can with rough unanimously, it is also possible to inconsistent.Typically, the 30%～80% of the length dimension that length dimension is the second short circuit board of the first short circuit board (right-hand circuit board of the short circuit board of Figure 19 253 and the left side circuit board of the short circuit board 253 of Figure 20).The length dimension of the more preferably first short circuit board is the 1/3～2/3 of the length dimension of the second short circuit board.In this embodiment, the half of the size of the length dimension substantially second short circuit board of the first short circuit board.The size of the second short circuit board is between 15mm～65mm (concrete depending on application scenario).In the lamp holder of one end that the first short circuit board is arranged at LED straight lamp, and described second short circuit board is arranged in the lamp holder of the relative other end of LED straight lamp.

Because using the structure of external driving power supply, shorten the length dimension of lamp holder.For ensureing that the entire length of LED meets regulation, the length of its lamp holder cripetura is supplied by the length of prolonging lamp tube.Because the length of fluorescent tube has prolongation, correspondingly extend the length of the lamp plate being attached in fluorescent tube.Under equal lighting condition, being attached to the interval between the LED component on the lamp plate of tube inner wall can strengthen accordingly, owing to the interval between LED component increases, so can improve radiating efficiency, reduce temperature when LED component operates, and can extend the life-span of LED component.

This utility model LED straight lamp in the realization of each embodiment with as previously mentioned.Need point out be, in various embodiments, for same LED straight lamp, " lamp plate use bendable circuit soft board ", the molectron of length circuit board " power supply have ", " etc. in feature, one or more technical characteristic can be only included.

Additionally, wherein content system about " lamp plate use bendable circuit soft board " can be selected from one of them or a combination thereof including its correlation technique feature in embodiment.

Such as, in lamp plate uses bendable circuit soft board, it is connected by wire routing between described bendable circuit soft board and the outfan of described power supply or welds between described bendable circuit soft board and the outfan of described power supply.Additionally, described bendable circuit soft board includes a dielectric layer and the storehouse of a line layer；Bendable circuit soft board in the circuit protecting layer of surface-coated ink material, and can realize the function of reflectance coating by the width increased circumferentially.

Such as, in Power Management Design, the molectron of length circuit board has a long circuit board and a short circuit board, long circuit board and short circuit board are fitted each other and fixed through gluing mode, and short circuit board is positioned at long circuit board adjacent peripheral edges.There is on short circuit board power supply module, be monolithically fabricated power supply.

At the driving framework of Double-End Source, can only use in the way of wherein one end is with as single ended power supply by support and receive external drive signal.

When DC signal is as external drive signal, the power supply module of LED straight lamp can omit rectification circuit.

In the rectification circuit of power supply module designs, can be that there is single rectification unit, or double rectification unit.The first rectification unit in double rectification circuits and the second rectification unit pin with the two ends lamp holder being arranged in LED straight lamp respectively couples.Single rectification unit is applicable to the driving framework of single ended power supply, and double rectification unit is applicable to the driving framework of single ended power supply and Double-End Source.And when being configured with at least one rectification unit, go for low-frequency ac signal, high-frequency ac signal or the drive environment of DC signal.

In the pin of LED straight lamp designs, can be single-ended pair of pin (totally two pins, other end non-connection pin), each single pin of both-end (totally two pins), the framework of each pair of pin of both-end (totally four pins).Under the framework of each single pin of single-ended pair of pin and both-end, it is applicable to the rectification circuit design of single rectification circuit.Under the framework of each pair of pin of both-end, it is applicable to the rectification circuit design of double rectification circuit, and uses each arbitrary pin of both-end or arbitrary single-ended double pins to receive external drive signal.

Furthermore it is possible to additionally increase protection circuit to protect LED module.Protection circuit can detect the electric current of LED module and/or voltage carrys out corresponding startup and corresponding crosses stream or overvoltage protection.

In the auxiliary power module of power supply module designs, energy-storage units can be battery or super capacitor, in parallel with LED module.Auxiliary power module is suitable for inclusion in the LED drive module design of drive circuit.

In the LED module of power supply module designs, LED module can comprise the multi-string LED assembly being connected in parallel to each other (i.e., single LED chip, or the LED group of multiple LED modules with different colors chip composition) string, the LED component in each LED component string can be connected to each other and form netted connection.

It is to say, features described above can be made arbitrary permutation and combination, and for the improvement of LED straight lamp.

Refer to Figure 24 A, for the application circuit block schematic diagram of the power supply module of the LED straight lamp according to this utility model the first preferred embodiment.Alternating current power supply 508 is to provide alternating current power supply signal.Alternating current power supply 508 can be civil power, voltage range 100-277V, and frequency is 50 or 60Hz.Lamp tube drive circuit 505 receives the alternating current power supply signal of alternating current power supply 508, and is converted into alternating-current driving signal with as external drive signal.Lamp tube drive circuit 505 can be electric ballast, in order to by converted for the signal of civil power high frequency, the alternating-current driving signal of high pressure.The kind of common electronics ballast, such as: instantaneous starting type (Instant Start) electric ballast, preheating start-up type (Program Start) electric ballast, quick-starting direct (Rapid Start) electric ballast etc., LED straight lamp of the present utility model is the most applicable.The voltage of alternating-current driving signal is more than 300V, and preferable voltage range is 400-700V；Frequency is more than 10kHz, and preferable frequency range is 20k-50kHz.LED straight lamp 500 receives external drive signal, and in the present embodiment, external drive signal is the alternating-current driving signal of lamp tube drive circuit 505, and is driven to emit light.In the present embodiment, LED straight lamp 500 is the driving framework of single ended power supply, and same one end lamp holder of fluorescent tube has first pin the 501, second pin 502 first pin the 501, second pin 502, in order to receive external drive signal.First pin 501, second pin 502 of the present embodiment couples (that is, electrical connection or directly or indirectly connection) to lamp tube drive circuit 505 to receive alternating-current driving signal.

It should be noted that lamp tube drive circuit 505 is omissible circuit, therefore indicate with dotted line in the drawings.When lamp tube drive circuit 505 omits, alternating current power supply 508 couples with first pin the 501, second pin 502.Now, first pin the 501, second pin 502 receives the alternating current power supply signal that alternating current power supply 508 is provided, with as external drive signal.

In addition to the application of above-mentioned single ended power supply, LED straight lamp 500 of the present utility model can also apply the circuit structure to both-end list pin.Refer to Figure 24 B, for the application circuit block schematic diagram of the power supply module of the LED straight lamp according to this utility model the second preferred embodiment.Shown in Figure 24 A, first pin the 501, second pin 502 is respectively placed in the relative both-end lamp holder of the fluorescent tube of LED straight lamp 500 to form each single pin of both-end, and remaining circuit connects and function is then identical with circuit shown in Figure 24 A.

Then, Figure 24 C is referred to, for the circuit box schematic diagram of the LED according to this utility model the first preferred embodiment.The power supply module of LED mainly comprises the first rectification circuit 510, filter circuit 520 and LED drive module 530.First rectification circuit 510 couples first pin the 501, second pin 502, to receive external drive signal, and external drive signal carries out rectification, is then exported signal after rectification by first rectification output end the 511, second rectification output end 512.External drive signal in this can be the alternating-current driving signal in Figure 24 A and Figure 24 B or alternating current power supply signal, does not possibly even affect the operation of LED for DC signal.Filter circuit 520 couples with described first rectification circuit, in order to be filtered signal after rectification；I.e. filter circuit 520 couples first rectification output end the 511, second rectification output end 512 to receive signal after rectification, and is filtered signal after rectification, then by signal after outfan 522 exports filtering after outfan 521, second filters after the first filtering.LED drive module 530 couples with filter circuit 520, with signal after accepting filter luminescence；After after i.e. LED drive module 530 couples the first filtering, outfan 521, second filters, outfan 522 is with signal after accepting filter, and then drives the LED component (not drawing) in LED drive module 530 luminous.This part please refer to after the explanation of embodiment.

It should be noted that, in the present embodiment, after after first rectification output end the 511, second rectification output end 512 and the first filtering, outfan 521, second filters, the quantity of outfan 522 is two, then according to the increase in demand of signal transmission between the first rectification circuit 510, filter circuit 520 and LED drive module 530 each circuit or minimizing during actual application, couple between the most each circuit end points can be one or more than.

Furthermore, the power supply module of the LED shown in Figure 24 C and each embodiment of the power supply module of following LED, except being applicable in addition to the LED straight lamp shown in Figure 24 A and Figure 24 B, for comprising two pins in order to transmit the illuminating circuit framework of electric power, such as: bulb lamp, PAL lamp, intubate the various different illuminating lamps such as electricity-saving lamp (PLS lamp, PLD lamp, PLT lamp, PLL lamp etc.) lamp socket specification the most applicable.

Refer to Figure 25 A, for the application circuit block schematic diagram of the power supply module of the LED according to this utility model the 4th preferred embodiment.The present embodiment comprises the first rectification circuit 510 and the second rectification circuit 540, filter circuit 520, LED drive module 530, and more increases anti-flicker circuit 550.Anti-flicker circuit 550 is coupled between filter circuit 520 and LED drive module 530.Wherein, the second rectification circuit 540 is omissible circuit, is represented by dotted lines in the drawings.

Anti-flicker circuit 550 couples the first filtering output end 521 and the second filtering output end 522, with signal after accepting filter, and in during less than particular case, consume the portion of energy of signal after filtering, the luminous situation generation being interrupted of LED drive module 530 is caused with the ripple of signal after suppression filtering.It is said that in general, filter circuit 520 has inductively or capacitively waits electric capacity and the inductance having parasitism on filtering unit, or circuit, and form resonance circuit.Resonance circuit alternating current power supply signal stop provide time, example: user close LED power supply after, the amplitude of its resonance signal can successively decrease in time.But, the LED module of LED is one-way conduction assembly and has minimum conducting voltage.When the valley value of resonance signal is less than the minimum conducting voltage of LED module, and when crest value remains above LED module minimum conducting voltage, the luminescence of LED module there will be scintillation.Anti-flicker circuit can flow through the electric current setting anti-flicker electric current more than at this moment, consumes the portion of energy of signal after filtering, and this portion of energy is higher than resonance signal energy difference between crest value and valley value, and suppresses the luminous scintillation of LED module.When signal is close to the minimum conducting voltage of LED module preferably the most after the filtering, after the consumed filtering of anti-flicker circuit, the portion of energy of signal is higher than resonance signal energy difference between crest value and valley value.

It should be noted that anti-flicker circuit 550 applies also for LED drive module 530 and do not comprises the performance of drive circuit 1530.It is to say, when LED drive module 530 comprises LED module 630, and LED module 630 is by applicable cases during the direct driven for emitting lights of signal after the filtering of filter circuit.The luminescence of LED module 630 will directly reflect filtering after the ripple of signal and change.The setting of anti-flicker circuit 550, by the suppression scintillation that LED is occurred after the power supply closing LED.

Refer to Figure 25 B, for the circuit diagram of the anti-flicker circuit according to this utility model one preferred embodiment.Anti-flicker circuit 650 comprises at least one resistance, such as: two resistance of series connection, is series between the first filtering output end 521 and the second filtering output end 522.In the present embodiment, the portion of energy of signal after anti-flicker circuit 650 persistently consumes filtering.When normal operating, the energy that this portion of energy is consumed much smaller than LED drive module 530.So, when after power-off, when after filtering, the level of signal drops near the minimum conducting voltage of LED module 630, anti-flicker circuit 650 still consume filtering after the portion of energy of signal and make LED module 630 reduce and be interrupted luminous situation.In a preferred embodiment, anti-flicker circuit 650 may be set to when the minimum conducting voltage of LED module 630, flows through more than or equal to an anti-flicker electric current, and can determine the equivalence anti-flicker resistance value of anti-flicker circuit 650 accordingly.

See Figure 26 A, for the application circuit block schematic diagram of the power supply module of the LED according to this utility model the 5th preferred embodiment.Compared to Figure 25 A illustrated embodiment, the present embodiment comprises the first rectification circuit 510 and the second rectification circuit 540, filter circuit 520, LED drive module 530 and anti-flicker circuit 550, and more increases protection circuit 560.Protection circuit 560 couples the first filtering output end 521 and the second filtering output end 522, and after detecting filtering, signal is to decide whether to enter guard mode.When determining to enter guard mode, the level size of signal after protection circuit 560 clamp-on filtering, to avoid the assembly in LED drive module 530 to be damaged.Wherein, the second rectification circuit 540 and anti-flicker circuit 550 are omissible circuit, are represented by dotted lines in the drawings.

See Figure 26 B, for the circuit diagram of the protection circuit according to this utility model one preferred embodiment.Protection circuit 660 comprises electric capacity 663 and 670, resistance 669, diode 672, voltage clamping circuit and bleeder circuit; wherein voltage clamping circuit comprises bidirectional triode thyristor 661 and bidirectional trigger diode 662, and bleeder circuit comprises the first bipolar junction transistors 667 as the first switching switch and the second bipolar junction transistors the 668, first resistance the 665, second resistance the 666, the 3rd resistance 664 and the 4th resistance 671 as the second switching switch.Protection circuit 660 enters guard mode when the electric current of LED module and/or overtension, and avoids the damage of LED module.

First end of bidirectional triode thyristor 661 couples the first filtering output end 521, and the second end couples the second filtering output end 522, and controls end and couple the first end of bidirectional trigger diode 662.One end of second end coupling capacitance 663 of bidirectional trigger diode 662, the other end of electric capacity 663 couples the second filtering output end 522.One end of resistance 664 couples the second end of bidirectional trigger diode 662, and the other end couples the second filtering output end 522, and in parallel with electric capacity 663.One end of first resistance 665 couples the second end of bidirectional trigger diode 662, and the other end couples the collector of the first bipolar junction transistors 667.The emitter-base bandgap grading of the first bipolar junction transistors 667 couples the second filtering output end 522.One end of second resistance 666 couples the second end of bidirectional trigger diode 662, and the other end couples collector and the base stage of the first bipolar junction transistors 667 of the second bipolar junction transistors 668.The emitter-base bandgap grading of the second bipolar junction transistors 668 couples the second filtering output end 522.One end of resistance 669 couples the base stage of the second bipolar junction transistors 668, one end of other end coupling capacitance 670.The other end of electric capacity 670 couples the second filtering output end 522.One end of 4th resistance 671 couples the second end of bidirectional trigger diode 662, and the other end couples the negative pole of diode 672.The positive pole of diode 672 couples the first filtering output end 521.

It should be noted that the resistance resistance less than the second resistance 666 of the first resistance 665.

Below the operation of the first overcurrent protection of explanation protection circuit 660.

The junction point of resistance 669 and electric capacity 670 receives current sense signal S531, and wherein current sense signal S531 represents the size of current that LED module flows through.The other end of the 4th resistance 671 couples voltage end 521 '.In this embodiment, voltage end 521 ' can couple a bias generator or as graphic, through diode 672 be couple to the first filtering output end 521 using filtering after signal as bias generator.When voltage end 521 ' couples extra bias generator, diode 672 can save filter, and in the drawings, diode 672 is represented by dotted lines.The combination of resistance 669 and electric capacity 670 can filter the radio-frequency component of current sense signal S531, and inputs the base stage of the second bipolar junction transistors 668 to control conducting and the cut-off of the second bipolar junction transistors 668 by filtering after current detection signal S531.By resistance 669 and the filter action of electric capacity 670, the misoperation of the second bipolar junction transistors 668 caused because of noise can be avoided.On reality is applied, resistance 669 and electric capacity 670 can omit (therefore resistance 669 and electric capacity 670 are represented by dotted lines in figure), and current sense signal S531 directly inputs the base stage of the second bipolar junction transistors 668.

When LED normal operating, the electric current of LED module is within normal range, the second bipolar junction transistors 668 is cut-off.Now, the base voltage of the first bipolar junction transistors 667 is drawn high and the first bipolar junction transistors 667 is turned on by the second resistance 666.Now, the current potential of the second end of bidirectional trigger diode 662 is according to the voltage of the bias generator of power end 521 ', and the 3rd resistance 664 of the 4th resistance 671 and parallel connection determines with the dividing ratios of the first resistance 665.Owing to the resistance of the first resistance 665 is less, dividing ratios is relatively low thus current potential of the second end of bidirectional trigger diode 662 is relatively low.Now, the control terminal potential of bidirectional triode thyristor 661 is also dragged down by bidirectional trigger diode 662, and bidirectional triode thyristor 661 makes protection circuit 660 be in unprotected state for cut-off.

When the electric current of LED module is more than a preset value, now the level of current sense signal S531 can be too high and make the second bipolar junction transistors 668 turn on.Second bipolar junction transistors 668 can drag down the base stage of the first bipolar junction transistors 667 and make the first bipolar junction transistors 667 for cut-off.Now, the current potential of the second end of bidirectional trigger diode 662 is according to the voltage of the bias generator of power end 521 ', and the 3rd resistance 664 of the 4th resistance 671 and parallel connection determines with the dividing ratios of the second resistance 666.Owing to the resistance of the second resistance 666 is relatively big, dividing ratios is higher thus the current potential of the second end of bidirectional trigger diode 662 is higher.Now, the control terminal potential of bidirectional triode thyristor 661 is also drawn high by bidirectional trigger diode 662, and bidirectional triode thyristor 661 makes protection circuit 660 be in guard mode for conducting with the voltage difference clamped down between the first filtering output end 521 and the second filtering output end 522.

In the present embodiment, the voltage system of bias generator determines according to the dividing ratios of trigger voltage, the 4th resistance 671 and the 3rd resistance 664 of parallel connection of bidirectional triode thyristor 661 and the dividing ratios of the first resistance 665 and the 4th resistance 671 and the 3rd resistance 664 in parallel with the second resistance 666.Thereby, the voltage of bias generator is less than the trigger voltage of bidirectional triode thyristor 661 after the former dividing ratios dividing potential drop, and higher than the trigger voltage of bidirectional triode thyristor 661 after the dividing ratios dividing potential drop of the latter.It is, when the electric current of described LED module is more than preset value, described dividing ratios heightened by bleeder circuit, and reaches the effect that sluggishness compares.It is embodied as aspect, the first bipolar junction transistors 667 and the second bipolar junction transistors 668 as switching switch are connected respectively and are determined the first resistance 665 and the second resistance 666 of dividing ratios, whether bleeder circuit is more than preset value according to the electric current of LED module, determine the first bipolar junction transistors 667 and the cut-off whichever conducting of the second bipolar junction transistors 668 whichever, determine dividing ratios.Voltage clamping circuit decides whether to clamp down on the voltage of LED module according to the dividing potential drop of bleeder circuit.

Then the operation of the overvoltage protection of explanation protection circuit 660.

The junction point of resistance 669 and electric capacity 670 receives current sense signal S531, and wherein current sense signal S531 represents the size of current that LED module flows through.Therefore, now protection circuit 660 still has the function of current protection.The other end of the 4th resistance 671 couples voltage end 521 ', and in this embodiment, voltage end 521 ' couples the anode of LED module to detect the voltage of LED module.In the present embodiment, the dividing ratios of the 3rd resistance 664 of the 4th resistance 671 and parallel connection and the dividing ratios of the first resistance 665 and the 4th resistance 671 and the 3rd resistance 664 in parallel and the second resistance 666 will be regarding the voltage of voltage end 521 ', and the voltage of the i.e. first drive output 1521 or the first filtering output end 521 adjusts.Therefore, the overcurrent protection of protection circuit 660 still can normal operating.

When the electric current of LED module is not less than preset value, the current potential (being determined with the voltage of voltage end 521 ' with the dividing ratios of the first resistance 665 in parallel and the 3rd resistance 664 by resistance 671) of the second end of bidirectional trigger diode 662 is not enough to trigger bidirectional triode thyristor 661.Now, triggering bidirectional triode thyristor 661 is cut-off, and protection circuit 660 is in unprotected state.When LED module operation exception, such as: LED module is opened a way, and causes the voltage of the anode of LED module more than an overpressure value.Now, the current potential of the second end of bidirectional trigger diode 662 higher and make the first end of bidirectional trigger diode 662 exceed trigger bidirectional triode thyristor 661 trigger voltage.Now, triggering bidirectional triode thyristor 661 for conducting, protection circuit 660 is in the level of signal after guard mode clamp-on filtering.

As it has been described above, protection control circuit 660 can have stream or over-voltage protecting function, or can have the function of stream and overvoltage protection simultaneously.

It addition, protection circuit 660 can be in the two ends parallel diode of the 3rd resistance 664, to clamp down on the voltage at two ends.The threshold voltage of Zener diode is preferably 25-50V, more preferably 36V.

Furthermore; bidirectional triode thyristor 661 can use thyristor (Silicon Controlled Rectifier; SCR) replace; bidirectional trigger diode 662 can replace with solid discharging tube (Thyristor Surge Suppresser), and does not affect the defencive function of protection circuit.Especially, pressure drop during conducting can be reduced by employing thyristor pipe.

In one embodiment, the component parameter of protection circuit 660 can set as follows.The resistance of resistance 669 is preferably 10 nurses difficult to understand.The capacitance of electric capacity 670 is preferably 1nf.The capacitance of electric capacity 633 is preferably 10nf.Voltage range 26-36V of bidirectional trigger diode 662.The resistance of the 4th resistance 671 is preferably 300K-600K Austria nurse, more preferably 540K Austria nurse.The resistance of the second resistance 666 is preferably 100K-300K Austria nurse, more preferably 220K Austria nurse.The resistance of the first resistance 665 is preferably 30K-100K Austria nurse, more preferably 40K Austria nurse.The resistance of the 3rd resistance 664 is preferably 100K-300K Austria nurse, more preferably 220K Austria nurse.

Refer to Figure 27 A, for the application circuit block schematic diagram of the power supply module of the LED straight lamp according to this utility model the 16th preferred embodiment.The LED straight lamp of the present embodiment comprises the first rectification circuit 510 and the second rectification circuit 540, filter circuit 520 and LED drive module 530, and more increases overvoltage crowbar 1570.Overvoltage crowbar 1570 couples the first filtering output end 521 and the second filtering output end 522, with signal after detecting filtering, and when after filtering, the level of signal is higher than setting overpressure value, and the level of signal after clamp-on filtering.Therefore, overvoltage crowbar 1570 can protect the assembly of LED drive module 530 not damage because crossing high pressure.Second rectification circuit 540 is for omitting, therefore is represented by dotted lines in the drawings.

Refer to Figure 27 B, for the circuit diagram of the overvoltage crowbar according to this utility model preferred embodiment.Overvoltage crowbar 1670 comprises Zener diode 1671, such as: Zener diode (Zener Diode), couples the first filtering output end 521 and the second filtering output end 522.Zener diode 1671 turned on when the voltage difference (that is, the level of signal after filtering) of the first filtering output end 521 and the second filtering output end 522 reaches threshold voltage, made voltage difference clamp down on threshold voltage.Overvoltage crowbar 1670 can be avoided, such as: instantaneous starting type (Instant Start) electric ballast is the high alternating voltage output etc. of short time at the beginning of starting, and temporary high voltage causes the damage of LED drive module 530.The protection voltage (or threshold voltage of Zener diode 1671) of overvoltage crowbar 1670 preferably less than 500V, such as: the scope of 100-500V, is more preferably less than 400V, such as: the scope of 300-400V.

These are only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and simple modifications etc. made in this utility model flesh and blood, within should be included in protection domain of the present utility model.

Claims (26)

1. a protection circuit; it is characterized in that, this protection circuit comprises a bleeder circuit, and described bleeder circuit produces a dividing potential drop according to a dividing ratios and a voltage of a LED module and/or an electric current; and when the electric current of described LED module is more than a preset value, heighten described dividing ratios.

A kind of protection circuit the most according to claim 1, it is characterised in that

Described bleeder circuit comprises one first switching switch and one second switching switch, respectively series connection one first resistance and one second resistance,

When the electric current of described LED module is less than described preset value, described first switching switch conduction, described second switching switch cut-off, described dividing ratios is determined by described first resistance,

When the electric current of described LED module is more than described preset value, described first switching switch cut-off, described second switching switch conduction, described dividing ratios is determined by described second resistance.

A kind of protection circuit the most according to claim 2, it is characterised in that the resistance of described second resistance is more than the resistance of described first resistance.

A kind of protection circuit the most according to claim 3, it is characterised in that described protection circuit also comprises a voltage clamping circuit, and described voltage clamping circuit couples described LED module, and described voltage clamping circuit decides whether to clamp down on the voltage of described LED module according to described dividing potential drop.

5. a lamp, it is characterised in that: including: the protection circuit as according to any one of claim 1-4；Wherein,

Described lamp also includes a fluorescent tube, in order to receive an external drive signal；

One first rectification circuit, couples described fluorescent tube, in order to described external drive signal is carried out rectification, to produce a rectified signal；

One filter circuit, couples with described first rectification circuit, in order to be filtered signal after described rectification, to produce a filtered signal；

One LED drive module, couples with described filter circuit, and comprises a LED module, and wherein said LED drive module is configured to receive after described filtering signal and produces a driving signal, and described LED module is in order to receive described driving signal and luminous；

Described protection circuit, couples described filter circuit, and is configured to determine whether enter a guard mode, and when entering described guard mode, described protection circuit clamps down on the level size of signal after described filtering.

Lamp the most according to claim 5, it is characterised in that described lamp is LED.

Lamp the most according to claim 5, it is characterised in that described lamp is LED straight lamp.

Lamp the most according to claim 7, it is characterised in that

Described filter circuit has one first filtering output end and one second filtering output end,

Described protection circuit also comprises a voltage clamping circuit, and described voltage clamping circuit couples described LED module, and described voltage clamping circuit decides whether to clamp down on the voltage of described LED module according to described dividing potential drop；

Described voltage clamping circuit couples described first filtering output end and the second filtering output end,

Described bleeder circuit couples described voltage clamping circuit, described second filtering output end and a bias generator, and wherein said bleeder circuit is configured to receive a current sense signal, and wherein said current sense signal represents described LED module and flows through the size of an electric current.

Lamp the most according to claim 8, it is characterised in that

Described protection circuit comprises electric capacity, resistance, diode, voltage clamping circuit and bleeder circuit, and described voltage clamping circuit comprises a bidirectional triode thyristor and a bidirectional trigger diode,

Described bleeder circuit comprises one first bipolar junction transistors and one second bipolar junction transistors, one first resistance, one second resistance, one the 3rd resistance and one the 4th resistance；

One first end of described bidirectional triode thyristor couples described first filtering output end, and one second end couples described second filtering output end, and a control end couples one first end of described bidirectional trigger diode；One end of one second end coupling capacitance of bidirectional trigger diode, the other end of electric capacity couples the second filtering output end；

One end of described 3rd resistance couples described second end of described bidirectional trigger diode, and the other end couples described second filtering output end, and in parallel with described electric capacity；

One end of described first resistance couples described second end of described bidirectional trigger diode, and the other end couples a collector of described first bipolar junction transistors；One emitter-base bandgap grading of described first bipolar junction transistors couples described second filtering output end；

One end of described second resistance couples described second end of described bidirectional trigger diode, and the other end couples a collector and a base stage of described first bipolar junction transistors of described second bipolar junction transistors；

One emitter-base bandgap grading of described second bipolar junction transistors couples described second filtering output end；One end of resistance couples the base stage of described second bipolar junction transistors, and the other end couples one end of described electric capacity；The other end of described electric capacity couples described second filtering output end；

One end of described 4th resistance couples described second end of described bidirectional trigger diode, and the other end couples the negative pole of described diode；The positive pole of described diode couples described first filtering output end.

Lamp the most according to claim 9, it is characterised in that

When described LED straight lamp normal operating, the electric current of described LED module is within normal range, described second bipolar junction transistors cut-off, described bidirectional triode thyristor is cut-off, and described protection circuit is not in guard mode.

11. lamps according to claim 9; it is characterized in that; when the described electric current of described LED module is more than a preset value; described second bipolar junction transistors conducting; described bidirectional triode thyristor is to turn on to clamp down on the voltage difference between described first filtering output end and described second filtering output end, and described protection circuit is in guard mode.

12. lamps according to claim 8, it is characterised in that described filter circuit provides described bias generator at described first filtering output end；And described protection circuit also comprises a diode, the positive pole of described diode is coupled to described bias generator, and negative pole is coupled to described bleeder circuit.

13. lamps according to claim 7, it is characterised in that

Described filter circuit has one first filtering output end and one second filtering output end, and described protection circuit comprises a voltage clamping circuit and a bleeder circuit,

Described voltage clamping circuit couples described first filtering output end and described second filtering output end,

Described bleeder circuit couples described voltage clamping circuit and described second filtering output end, wherein said bleeder circuit couples an anode of described LED module to detect the voltage of described LED module, and it being configured to receive a current sense signal, wherein said current sense signal represents the size of the electric current that described LED module flows through.

14. lamps according to claim 13, it is characterised in that

When the described electric current of described LED module is within normal range; but when the described voltage of the described anode of described LED module is more than an overpressure value; described bleeder circuit makes described voltage clamping circuit turn between described first filtering output end and the second filtering output end, makes described protection circuit enter described guard mode to clamp down on the voltage difference between described first filtering output end and the second filtering output end.

15. lamps according to claim 8, it is characterised in that

Described protection circuit also comprises another electric capacity and another resistance; between another electric capacity described with another resistance described one is connected end and is suitable to receive described current sense signal; the other end of another resistance described couples described bleeder circuit, and the other end of another electric capacity described couples described second filtering output end.

16. lamps according to claim 9, it is characterised in that

Described protection circuit also comprises an electric capacity,

Wherein said voltage clamping circuit comprises a bidirectional triode thyristor and a bidirectional trigger diode,

One first end of described bidirectional triode thyristor couples described first filtering output end, and one second end couples described second filtering output end, and a control end couples one first end of described bidirectional trigger diode；

One second end of described bidirectional trigger diode couples one end of described electric capacity, and the other end of described electric capacity couples described second filtering output end；And described bleeder circuit is coupled to described second end of described bidirectional trigger diode.

17. lamps according to claim 16, it is characterised in that

Described protection circuit also comprises an electric capacity, and wherein said voltage clamping circuit comprises a thyristor and a bidirectional trigger diode,

One first end of described thyristor couples described first filtering output end, and one second end couples described second filtering output end, and a control end couples one first end of described bidirectional trigger diode；

One second end of described bidirectional trigger diode couples one end of described electric capacity, and the other end of described electric capacity couples described second filtering output end；And described bleeder circuit is coupled to described second end of described bidirectional trigger diode.

18. lamps according to claim 17, it is characterised in that

Described bleeder circuit comprises one first switching switch and one second switching switch, respectively series connection one first resistance and one second resistance,

One end of described first resistance couples described second end of described bidirectional trigger diode, and the other end couples described first switching switch；Described first switching switch is also coupled to described second filtering output end；

One end of described second resistance couples described second end of described bidirectional trigger diode, and the other end couples described second switching switch and described first switching switch；Described second switching switch is also coupled to described second filtering output end, and is configured to receive described current sense signal.

19. lamps according to claim 17, it is characterised in that

Described first bipolar junction transistors and described second bipolar junction transistors as switching switch are connected respectively and are determined described first resistance of dividing ratios and described second resistance,

Whether described bleeder circuit is more than preset value according to the electric current of described LED module, determines described first bipolar junction transistors and the cut-off/conducting of described second bipolar junction transistors, and then determines dividing ratios；

Described voltage clamping circuit decides whether to clamp down on the voltage of described LED module according to the dividing potential drop of described bleeder circuit.

20. lamps according to claim 19, it is characterised in that

Described bleeder circuit comprises one first switching switch and one second switching switch, respectively series connection one first resistance and one second resistance,

The resistance value of described first resistance is less than the resistance value of described second resistance; and when when described LED normal operating, the electric current of described LED module is within normal range; described second switching switch is cut-off; described first switching switch is conducting; described thyristor is ended by the current potential of described second end of described bidirectional trigger diode, makes described protection circuit not enter guard mode.

21. lamps according to claim 20, it is characterised in that

The resistance value of described first resistance is less than the resistance value of described second resistance; and when the electric current of described LED module is more than a preset value; described second switching switch conduction; described first switching switch is cut-off; described thyristor is turned on by the current potential of described second end of described bidirectional trigger diode, makes described protection circuit enter guard mode to clamp down on the voltage difference between described first filtering output end and the second filtering output end.

22. lamps according to claim 9, it is characterised in that

Described protection circuit also has, the Zener diode in order to clamp down on described both end voltage in parallel with the two ends of described 3rd resistance.

23. lamps according to claim 18, it is characterised in that

The resistance value of described first resistance is less than the resistance value of described second resistance; when the voltage of anode of described LED module is more than an overpressure value; described second switching switch is conducting; described first switching switch is cut-off; described thyristor is turned on by the current potential of described second end of described bidirectional trigger diode, makes described protection circuit enter guard mode to clamp down on the voltage difference between described first filtering output end and the second filtering output end.

24. lamps according to claim 18, it is characterised in that

The resistance value of described first resistance is less than the resistance value of described second resistance; when the voltage of the anode of described LED module is less than an overpressure value; described second switching switch is cut-off; described first switching switch is conducting; described thyristor is ended by the current potential of described second end of described bidirectional trigger diode, makes described protection circuit not enter guard mode.

25. lamps according to claim 8, it is characterised in that

Described filter circuit has one first filtering output end and one second filtering output end; and described protection circuit comprises a diode; couple described first filtering output end and described second filtering output end; wherein said diode has a threshold voltage, and is suitable to when after described filtering, the magnitude of voltage of signal turns on when reaching described threshold voltage.

26. lamps according to claim 7, it is characterised in that

Described lamp also comprises an anti-flicker circuit, is coupled between described filter circuit and described LED drive module,

Described filter circuit has: one first filtering output end and one second filtering output end, and described anti-flicker circuit comprises at least one resistance, and a described resistance is coupled between described first filtering output end and described second filtering output end.