CN105813274A - Power driving circuit and light emitting diode (LED) lamp tube - Google Patents
Power driving circuit and light emitting diode (LED) lamp tube Download PDFInfo
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- CN105813274A CN105813274A CN201610332938.2A CN201610332938A CN105813274A CN 105813274 A CN105813274 A CN 105813274A CN 201610332938 A CN201610332938 A CN 201610332938A CN 105813274 A CN105813274 A CN 105813274A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
Abstract
The invention discloses a power driving circuit and a light emitting diode (LED) lamp tube. The power driving circuit comprises a first voltage input end, a second voltage input end, a first simulation lamp filament, a second simulation lamp filament, a high-pass circuit, a control circuit, an isolation circuit, a first rectification circuit, a second rectification circuit and a DC conversion filter circuit, wherein the above circuits are connected with one another to form the power driving circuit. The power driving circuit can be applied to an AC mains supply and is simultaneously compatible with an electronic ballast; with the design of the high-pass circuit, the control circuit and the isolation circuit, the power driving circuit conforms to leakage current test and voltage resistant test in safety regulation; and on the other hand, the LED lamp tube comprising the power driving circuit can be compatible with the electronic ballast and also conforms to the leakage current test and voltage resistant test in safety regulation, and the compatibility of various types of electronic ballasts is further improved.
Description
Technical field
The present invention relates to field of lamp illumination, particularly relate to a kind of power driving circuit and LED lamp tube.
Background technology
At present, the traditional fluorescent lighting of LED replacement has huge prospect and market, and traditional fluorescent lamp has been required for electric ballast and has driven, as it is shown in figure 1, the circuit of traditional fluorescent lamp includes electric ballast and fluorescent tube, fluorescent tube includes two filaments, L and the N end of electric ballast is used for incoming transport civil power, when electric ballast starts, two filaments of fluorescent tube are preheated, then have two outfan output high voltages of electric ballast again, light fluorescent tube.And current conventional LED is all be only operable on electric main, as in figure 2 it is shown, the LED lamp tube in Fig. 2 is all be operated under electric main.Therefore, when using LED illumination to replace conventional fluorescent, it is necessary to destroy original florescent lamp fitting system, take down the original ballast of fluorescent lamp, be revised as and directly driven by electric main.But this circuit amendment will bring problems with: amendment cost of labor is high；Time and effort consuming；Destroy the Safety Approval of original light fixture.
For this reason, it may be necessary to provide a kind of power driving circuit and LED lamp tube to solve the problems referred to above.Although, there is also the LED lamp tube of compatible electric ballast in the market, but majority does not meet the leakage current test in safety and voltage-withstand test, and the compatibility of product is poor, the LED lamp tube of the compatible electric ballast of part even adopts the mode increasing machinery touch switch to pass through certification, this mode brings inconvenience to the use of client, and meanwhile, the LED lamp tube of the compatible electric ballast in market there is also the problem such as cost height and fraction defective height.
Summary of the invention
It is an object of the invention to provide a kind of power driving circuit and LED lamp tube, it is intended to solve the problems referred to above.
In order to solve above-mentioned technical problem, first aspect, a kind of power driving circuit, described power driving circuit includes: the first voltage input end, the second voltage input end, the first simulation filament, the second simulation filament, high pass circuit, control circuit, isolation circuit, the first rectification circuit and DC converting filter circuit, wherein, described first voltage input end, the second voltage input end are connected with the voltage output end of electric ballast；
Described first voltage input end includes the first live wire end and the first zero line side, described first simulation filament is connected with described first live wire end and the first zero line side, described second voltage input end includes the second live wire end and the second zero line side, described second simulation filament is connected with described second live wire end and the second zero line side, and described first simulation filament and the second simulation filament are used for inducing described electric ballast output high voltage；
The first input end of described control circuit is connected with described first live wire end and the first zero line side by described high pass circuit, second input of described control circuit is connected with described second voltage input end, and described first live wire end, the first zero line side and described second live wire end, the second zero line side are also connected with described isolation circuit；
Described control circuit is also connected with described isolation circuit, when described high frequency voltage is by described high pass circuit, described first live wire end and the first zero line side are connected with the first voltage output end of described isolation circuit for controlling described isolation circuit, described second live wire end and the second zero line side are connected with the second voltage output end of described isolation circuit by described control circuit；
Described first rectification circuit is connected with the first voltage output end of described isolation circuit, the second voltage output end, is used for converting alternating current to unidirectional current；
Described DC converting filter circuit is connected with described first rectification circuit, for exporting as driving voltage after being filtered by described DC power conversion.
Preferably, described simulation filament is resettable fuse.
Preferably, described power driving circuit also includes the second rectification circuit, the voltage input end of described second rectification circuit is connected with described first voltage input end, the voltage output end of described second rectification circuit is connected with described DC converting filter circuit, described DC converting filter circuit for exporting as driving voltage after the DC power conversion filtering of described second rectification circuit output, wherein, described first voltage input end is connected with electric main.
Preferably, described power driving circuit also includes a protection circuit, and described protection circuit is connected to described first voltage input end, is used for protecting described power driving circuit.
Preferably, described high pass circuit includes the first electric capacity and the second electric capacity, and the first end of described first electric capacity is connected with described first zero line side, the second end is connected with the first end of described second electric capacity, and the second end of described second electric capacity is connected with described first live wire end.
Preferably, described control circuit includes the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the first resistance and the 3rd electric capacity；
Described first diode, second diode, 3rd diode and the 4th diode composition rectifier bridge, the first input end that first end is described control circuit of described rectifier bridge, it is connected with described first live wire end and the first zero line side by described high pass circuit, second input that second end is described control circuit of described rectifier bridge, it is connected with described second voltage input end, 3rd end of described rectifier bridge is connected with the negative pole of described 5th diode by described first resistance, 4th end of described rectifier bridge is connected with the positive pole of described 5th diode, first end of described 3rd electric capacity and the negative pole of the 5th diode connect, second end is connected with the positive pole of described 5th diode.
Preferably, described isolation circuit includes gate-controlled switch, and described gate-controlled switch is controlled it by described control circuit and opens or closes.
Further, described gate-controlled switch includes the first relay and the second relay, and described first relay and the second relay all include the first contact, the second contact, the 3rd contact, the 4th contact, the 5th contact and the 6th contact；
Described first relay, the second relay the first contact and the second contact between each through inductance coil connect, the second contact of described first relay is connected with the first end of described 3rd electric capacity, the second contact of described second relay is connected with the second end of described 3rd electric capacity, the first contact of described first relay is connected with the first contact of described second relay；
Described control circuit for controlling described first relay, the 3rd contact of the second relay and the conducting of the 6th contact, the 4th contact and the 5th contact and disconnection by described inductance coil；
Wherein, described first live wire end, the first zero line side are connected with the 3rd contact of described first relay, the 4th contact respectively, as the first voltage output end of described isolation circuit behind the 5th contact of described first relay and described 6th contact connection；Described second live wire end, the second zero line side are connected with the 3rd contact of described second relay, the 4th contact respectively, the 5th contact of described second relay and the 6th contact connect after as the second voltage output end of described isolation circuit.
Further, described first rectification circuit is the rectifier bridge being made up of four diodes and the 4th electric capacity；Described second rectification circuit is the rectifier bridge being made up of four diodes and the 5th electric capacity.
Preferably; described protection circuit includes: electric fuse and the 6th electric capacity; described electric fuse one end is connected with the first live wire end or the first zero line side, the other end is connected with described 6th electric capacity one end, and the other end of described 6th electric capacity is connected with described first zero line side or the first live wire end.
Preferably, described power driving circuit also includes the 7th electric capacity, and the two ends of described 7th electric capacity are connected with described second live wire end and the second zero line side respectively.
Second aspect, a kind of LED lamp tube, described LED lamp tube includes any one above-mentioned power driving circuit.
Beneficial effect: provide a kind of power driving circuit in embodiments of the invention, compared with prior art, this power driving circuit includes: the first voltage input end, the second voltage input end, the first simulation filament, the second simulation filament, high pass circuit, control circuit, isolation circuit, the first rectification circuit, the second rectification circuit and DC converting filter circuit, foregoing circuit has been interconnected to constitute power driving circuit, this power driving circuit can apply to electric main, compatible electronic ballast, is namely provided voltage by electric ballast simultaneously；The design of high pass circuit, control circuit and isolation circuit so that this power driving circuit meets the leakage current test in safety and voltage-withstand test；It addition, the first simulation filament and the second simulation filament adopt resettable fuse, more improve this power driving circuit compatibility to different types of electric ballast.
On the other hand, embodiments of the invention additionally provide a kind of LED lamp tube, this LED lamp tube not only can compatible electronic ballast, also meet the leakage current test in safety and voltage-withstand test, it addition, also improve the compatibility to different types of electric ballast simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit structure diagram of the traditional fluorescent lamp provided in background of invention；
Fig. 2 is the circuit structure diagram of the LED lamp tube provided in background of invention；
Fig. 3 is the structure chart of the power driving circuit that one embodiment of the invention provides；
Fig. 4 is the structure chart of the power driving circuit that one embodiment of the invention provides；
Fig. 5 is the structure chart of the LED lamp tube that one embodiment of the invention provides；
Fig. 6 is the structure chart of the LED lamp tube that one embodiment of the invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Fig. 3 illustrates the structure chart of the power driving circuit that one embodiment of the invention provides, as shown in Figure 3, this power driving circuit 10 includes: the first voltage input end, the second voltage input end, the first simulation filament 111, second simulate filament 112, high pass circuit 12, control circuit 13, isolation circuit the 14, first rectification circuit 151 and DC converting filter circuit 16, wherein, first voltage input end, the second voltage input end are connected with the voltage output end of electric ballast, and this electric ballast is use electric ballast in the fluorescent lamp that market is common.First voltage input end includes the first live wire end A and the first zero line side B, first simulation filament 111 is connected with the first live wire end A and the first zero line side B, second voltage input end includes the second live wire end A1 and the second zero line side B1, second simulation filament 112 is connected with the second live wire end A1 and the second zero line side B1, and the first simulation filament 111 and the second simulation filament 111 are mainly used in photoinduced electron ballast output high voltage；First simulation filament 111 and the second simulation filament 111 can be resistance etc., in this preferred enforcement, first simulation filament 111 and the second simulation filament 111 are resettable fuse, if under alternate current states, owing to input voltage energy is bigger, resettable fuse moment is blown, when not using, resettable fuse can also recover automatically, use resettable fuse to remove photoinduced electron ballast output high voltage as simulation filament, improve the circuit compatibility to different types of electric ballast.
The first input end of control circuit 13 is connected with the first live wire end A and the first zero line side B of the first voltage input end by high pass circuit 12, wherein, high pass circuit 12 is connected with the first live wire end A and the first zero line side B respectively, second input of control circuit and the second voltage input end connect, first live wire end A, first zero line side B and the connection isolating circuit 14, second live wire end A1 and the second zero line side B1 is also connected with isolation circuit, high pass circuit 12 is used for hindering low-frequency voltage, such as electric main, its frequency is approximately 50Hz/60Hz, electric main then can not pass through this high pass circuit 12；But the voltage of electric ballast output is high frequency voltage, then can pass through this high pass circuit 12.Control circuit 13 is also connected with isolation circuit 14, when high frequency voltage is by high pass circuit 12, control circuit 13 obtains voltage and starts to start work, and first voltage output end of the first live wire end A and the first zero line side B with isolation circuit 14 is connected, connected with the second voltage output end isolating circuit 14 by the second live wire end A1 and the second zero line side B1 for controlling isolation circuit 14 by control circuit 13；Isolation the first voltage output end of circuit 14, the second voltage output end and the first rectification circuit 15 connect, and the first rectification circuit 15 is for converting the alternating current of isolation the first voltage output end of circuit 14, the second voltage output end output to unidirectional current；DC converting filter circuit 16 is connected with the first rectification circuit 15, for exporting as driving voltage after DC power conversion is filtered, this driving voltage can be used to drive loaded work piece, for instance driving LED lamp tube luminous, wherein DC converting filter circuit 16 includes DC/DC changer and filter circuit.Therefore above-mentioned power driving circuit 10 can be used under the voltage mode of output of electric ballast, and simulation filament adopts resettable fuse so that this power driving circuit 10 can compatible more different types of electric ballasts.It is to pass through high pass circuit 12 for the such high frequency voltage of electric main, therefore, when the first voltage input end is low-frequency voltage, control circuit 13 does not work, isolation circuit 13 makes the first live wire end and the first zero line side and the first voltage output end isolating circuit 14 be off, isolation circuit 14 makes the second live wire end and the second zero line side and the second voltage output end isolating circuit 14 be off, therefore this power driving circuit by the Hi-pot test of 1500V, can meet the Hi-pot test in safety；Leakage current test in safety simultaneously is to connect 220V alternating current at the first voltage input end, second voltage input end earth lead carries out leakage current test, 220V alternating current is low-frequency voltage, isolation circuit 14 makes the first live wire end and the first zero line side and the first voltage output end isolating circuit 14 be off, isolation circuit 14 makes the second live wire end and the second zero line side and the second voltage output end isolating circuit 14 be off, therefore this power driving circuit can also meet the leakage current test in safety, make to use this source driving circuit electronic product safer.
nullPreferably，In the embodiment of the present invention，Power driving circuit 10 also includes the second rectification circuit 152，The voltage input end of the second rectification circuit 152 and the first voltage input end connect，Namely it is connected with the first live wire end A and the first zero line side B of the first voltage input end，The voltage output end of the second rectification circuit 152 is connected with DC converting filter circuit 16，DC converting filter circuit 16 exports as driving voltage after filtering for the DC power conversion exported by the second rectification circuit 152，This driving voltage can be used to drive loaded work piece，Such as drive LED lamp tube luminous，Wherein，First voltage input end is connected with electric main,When first voltage input end is directly accessed electric main，Owing to the input voltage energy of electric main is bigger，The resettable fuse moment that simulation filament 111 adopts is blown，Electric main becomes unidirectional current through the second rectification circuit 152，Exporting as driving voltage after DC converting filter circuit 16 conversion filtering.Owing to electric main is low-frequency voltage, therefore can not pass through high pass circuit 12, control circuit 13 and isolation circuit 14 and be in off position, thus without through the first rectification circuit 151 output to DC converting filter circuit 16.Therefore, including the power driving circuit of the second rectification circuit 152, it is also possible to be operated under the pattern of electric main.
Fig. 4 illustrates the structure chart of the power driving circuit that one embodiment of the invention provides, as shown in Figure 4, this power driving circuit includes: the first voltage input end, second voltage input end, first simulation filament 111, second simulation filament 112, high pass circuit 12, control circuit 13, isolation circuit 14, first rectification circuit 151, second rectification circuit 152, DC converting filter circuit 16 and protection circuit 17, wherein, first voltage input end, second voltage input end is connected with the voltage output end of electric ballast, this electric ballast is use electric ballast in the fluorescent lamp that market is common.First voltage input end includes the first live wire end A and the first zero line side B, first simulation filament 111 is connected with the first live wire end A and the first zero line side B, second voltage input end includes the second live wire end A1 and the second zero line side B1, second simulation filament 112 is connected with the second live wire end A1 and the second zero line side B1, and the first simulation filament 111 and the second simulation filament 111 are mainly used in photoinduced electron ballast output high voltage；First simulation filament 111 and the second simulation filament 111 can resistance etc., in this preferred enforcement, first simulation filament 111 and the second simulation filament 111 are resettable fuse P1 and resettable fuse P2, if under alternate current states, owing to input voltage energy is bigger, resettable fuse P1 and resettable fuse P2 moment are blown, when not using, resettable fuse P1 and resettable fuse P2 can also recover automatically, resettable fuse is used to remove photoinduced electron ballast output high voltage as simulation filament, improve the circuit compatibility to different types of electric ballast, reduce the fraction defective of this power circuit.
High pass circuit 12 includes the first electric capacity C1 and the second electric capacity C2, one end of first electric capacity C1 is connected with the first zero line side B, one end of the other end and the second electric capacity C2 connects, the other end of the second electric capacity C2 and the first live wire end A connect, high pass circuit 12 is used for hindering low-frequency voltage and logical high frequency voltage, low-frequency voltage such as electric main etc., the voltage of high frequency voltage such as electric ballast output, more than 50KHz.First end of the first input end of control circuit 13 and second end of the first electric capacity C1 and the second electric capacity C2 connects, and the second input of control circuit 13 and the second live wire end A1 connect；Control circuit includes the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the first resistance R1 and the three electric capacity C3；First diode D1, second diode D2, 3rd diode D3 and the four diode D4 forms rectifier bridge, the first input end that first end is control circuit 13 of this rectifier bridge, it is connected with the first live wire end A and the first zero line side B by high pass circuit 12, second input that second end is control circuit 13 of rectifier bridge, it is connected with the second voltage input end, 3rd end of this rectifier bridge is connected by the negative pole of the first resistance R1 and the five diode D5, 4th end of this rectifier bridge and the positive pole of the 5th diode D5 connect, first end of the 3rd electric capacity C3 and the negative pole of the 5th diode D5 connect, second end of the 3rd electric capacity C3 and the positive pole of the 5th diode D5 connect.Isolation circuit 14 includes gate-controlled switch, and gate-controlled switch is controlled its switch by control circuit 13.In this preferred embodiment, controlled opening the light includes the first relay SW1 and the second relay SW2, and in this preferred embodiment, the first relay SW1 and the second relay SW2 adopts and is connected in series, and also can adopt other connected modes.First relay SW1 and the second relay SW2 all includes the first contact 1, second contact 2, 3rd contact 3, 4th contact 4, 5th contact 5 and the 6th contact 6, wherein, inductance coil is connected between first contact 1 and the second contact 2, second contact 2 is connected with the voltage output end of control circuit 13, namely second contact 2 of the first relay SW1 is connected with first end of the 3rd electric capacity C3, second contact 2 of the second relay SW2 is connected with second end of the 3rd electric capacity C3, first contact 1 of the first relay SW1 is connected with first contact 1 of the second relay SW2, control circuit 13 is for controlling the first relay SW1 by inductance coil, 3rd contact 3 and the 6th contact 6 of the second relay SW2, the conducting of the 4th contact 4 and the 5th contact 5 and disconnection；Wherein, the first live wire end A, the first zero line side B are connected with the 4th contact 3, contact the 4, the 3rd of the first relay SW1 respectively, the 5th contact 5 of the first relay SW1 and the 6th contact 6 connect after as the first voltage output end isolating circuit 14；Second live wire end A1, the second zero line side B1 are connected with the 3rd contact 4, contact the 3, the 4th of the second relay SW respectively, the 5th contact 5 of the second relay SW2 and the 6th contact 6 connect after as the second voltage output end isolating circuit 14.When the first voltage input end and the second voltage input end and electric ballast connect, resettable fuse P1 and resettable fuse P2 photoinduced electron ballast output high voltage, high frequency voltage is by after high pass circuit 12, excitation control circuit 13 controls isolation circuit 14 and closes the first relay SW1 and the second relay SW2, make the first relay SW1, 3rd contact 3 and the 6th contact 6 of the second relay SW2, 4th contact 4 and the 5th contact 5 are in the conduction state, so that the first live wire end A and the first zero line side B connects with the first voltage output end of isolation circuit 14, second live wire end A1 and the second zero line side B1 connects with the second voltage output end of isolation circuit 14；Being connected by the first voltage output end and the second voltage output end and the first rectification circuit 151 of isolation circuit 14, first rectification circuit 151 is by four diode (diode D6, diode D7, diode D8 and diode D9) and the 4th electric capacity C4 composition rectifier bridge, two voltage output ends of the first rectification circuit 151 are connected with DC converting filter circuit 16, DC converting filter circuit 16 exports as driving voltage after filtering for the DC power conversion exported by the first rectification circuit 151, namely by two voltage output end LED+ and LED-outputs of DC converting filter circuit 16.Second rectification circuit 152 is also by four diode (diode D10, diode D11, diode D12 and diode D13) and the 4th electric capacity C5 composition rectifier bridge, two voltage input ends of the second rectification circuit 152 and the first live wire end A, first zero line side B connects, two voltage output ends of the second rectification circuit 152 are connected with DC converting filter circuit 16, DC converting filter circuit 16 exports as driving voltage after filtering for the DC power conversion exported by the second rectification circuit 151, namely by two voltage output end LED+ and LED-outputs of DC converting filter circuit 16, wherein, first live wire end A and the first zero line side B is that electric main connects, second rectification circuit 152 is to convert electric main to unidirectional current.
Owing to electric main cannot pass through high pass circuit 12, therefore, when the first voltage input end is low-frequency voltage, control circuit 13 does not work, two relays (SW1 and SW2) of isolation circuit 13 are in normally opened state, therefore this power driving circuit by the Hi-pot test of 1500V, can meet the Hi-pot test in safety；Leakage current test in safety simultaneously is to connect 220V alternating current at the first voltage input end, second voltage input end earth lead carries out leakage current test, 220V alternating current is low-frequency voltage, two relays (SW1 and SW2) of isolation circuit 13 are in normally opened state, therefore this power driving circuit can also meet the leakage current test in safety so that uses this source driving circuit electronic product safer.
Additionally, it is preferred that, in the embodiment of the present invention, this power driving circuit also includes a protection circuit 17, and protection circuit 17 is connected to the first voltage input end, is used for protecting this power driving circuit；Protection circuit 17 includes: electric fuse F1 and the six electric capacity C6, electric fuse F1 one end is connected with the first live wire end A or the first zero line side B, the other end and the connection of the 6th electric capacity C6 one end, the other end of the 6th electric capacity C6 and the first zero line side B or the first live wire end A connection.Power driving circuit also includes the 7th electric capacity C7, and the two ends of the 7th electric capacity C7 are connected with the second live wire end A1 or the second zero line side B1, and the 7th electric capacity plays filtering voltage regulation effect.
To sum up, above-mentioned different embodiment is it can be seen that this power driving circuit can apply to electric main, and compatible electronic ballast, is namely provided voltage by electric ballast simultaneously；The design of high pass circuit, control circuit and isolation circuit so that this power driving circuit meets the leakage current test in safety and voltage-withstand test；Additionally, first simulation filament and the second simulation filament adopt resettable fuse, more improve this power driving circuit compatibility to different types of electric ballast, due in the present embodiment, as long as adopting simple electronic devices and components namely can complete the design of this power driving circuit, create a further reduction power driving circuit cost, also reduce the cost of the electronic product using power driving circuit simultaneously.
Fig. 5 illustrates the structure chart of the LED lamp tube that one embodiment of the invention provides, as shown in Figure 5, this LED lamp tube 1 includes: power driving circuit 10, LED lamp panel 30, first lamp pin 101 and the second lamp pin 102, power driving circuit 10 is the power driving circuit in above-described embodiment, first voltage input end A of this power driving circuit, B and the first lamp pin 101 connects, second voltage input end A1, B1 and the second lamp pin 102 connects, this LED lamp tube 1 is to be operated under the pattern that electric ballast provides voltage, first lamp pin 101 and the second lamp pin 102 are connected with two voltage output ends of electric ballast 20 respectively, the input high frequency voltage of electric ballast 20, after power driving circuit 10, LED lamp panel 30 can be driven luminous.
This LED lamp tube 1 can also be operated under the pattern of electric main, and as shown in Figure 6, when voltage input end L, N are connected with electric main, electric main is low-frequency voltage, after power driving circuit 10, LED lamp panel 30 can be driven luminous.
To sum up, can be seen that from the above, this LED lamp tube not only can compatible electronic ballast, it is operated under the pattern that electric ballast provides voltage, can also under the powering mode of work exchange civil power, the power driving circuit provided in the embodiment of Fig. 3 and Fig. 4 is provided, the leakage current that this LED lamp tube also meets in safety is tested and voltage-withstand test, additionally, also improve the compatibility to different types of electric ballast, as long as owing to adopting simple electronic devices and components namely can complete the design of this power driving circuit, therefore, also reduce the cost of the LED lamp tube using power driving circuit.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (10)
1. a power driving circuit, it is characterized in that, including: the first voltage input end, the second voltage input end, the first simulation filament, the second simulation filament, high pass circuit, control circuit, isolation circuit, the first rectification circuit and DC converting filter circuit, wherein, described first voltage input end, the second voltage input end are connected with the voltage output end of electric ballast；
Described first voltage input end includes the first live wire end and the first zero line side, described first simulation filament is connected with described first live wire end and the first zero line side, described second voltage input end includes the second live wire end and the second zero line side, described second simulation filament is connected with described second live wire end and the second zero line side, and described first simulation filament and the second simulation filament are used for inducing described electric ballast output high voltage；
The first input end of described control circuit is connected with described first live wire end and the first zero line side by described high pass circuit, second input of described control circuit is connected with described second voltage input end, and described first live wire end, the first zero line side and described second live wire end, the second zero line side are also connected with described isolation circuit；
Described control circuit is also connected with described isolation circuit, when described high frequency voltage is by described high pass circuit, described first live wire end and the first zero line side are connected with the first voltage output end of described isolation circuit for controlling described isolation circuit, described second live wire end and the second zero line side are connected with the second voltage output end of described isolation circuit by described control circuit；
Described first rectification circuit is connected with the first voltage output end of described isolation circuit, the second voltage output end, is used for converting alternating current to unidirectional current；
Described DC converting filter circuit is connected with described first rectification circuit, for exporting as driving voltage after being filtered by described DC power conversion.
2. power driving circuit according to claim 1, it is characterised in that described simulation filament is resettable fuse.
3. power driving circuit according to claim 2, it is characterized in that, described power driving circuit also includes the second rectification circuit, the voltage input end of described second rectification circuit is connected with described first voltage input end, the voltage output end of described second rectification circuit is connected with described DC converting filter circuit, described DC converting filter circuit for exporting as driving voltage after the DC power conversion filtering of described second rectification circuit output, wherein, described first voltage input end is connected with electric main.
4. power driving circuit according to claim 3, it is characterised in that described power driving circuit also includes a protection circuit, and described protection circuit is connected to described first voltage input end, is used for protecting described power driving circuit.
5. power driving circuit according to claim 4, it is characterized in that, described high pass circuit includes the first electric capacity and the second electric capacity, first end of described first electric capacity is connected with described first zero line side, the second end is connected with the first end of described second electric capacity, and the second end of described second electric capacity is connected with described first live wire end.
6. power driving circuit according to claim 5, it is characterised in that described control circuit includes the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the first resistance and the 3rd electric capacity；
Described first diode, second diode, 3rd diode and the 4th diode composition rectifier bridge, the first input end that first end is described control circuit of described rectifier bridge, it is connected with described first live wire end and the first zero line side by described high pass circuit, second input that second end is described control circuit of described rectifier bridge, it is connected with described second voltage input end, 3rd end of described rectifier bridge is connected with the negative pole of described 5th diode by described first resistance, 4th end of described rectifier bridge is connected with the positive pole of described 5th diode, first end of described 3rd electric capacity and the negative pole of the 5th diode connect, second end is connected with the positive pole of described 5th diode.
7. power driving circuit according to claim 6, it is characterised in that described isolation circuit includes gate-controlled switch, described gate-controlled switch is controlled it by described control circuit and opens or closes.
8. power driving circuit according to claim 7, it is characterized in that, described gate-controlled switch includes the first relay and the second relay, and described first relay and the second relay all include the first contact, the second contact, the 3rd contact, the 4th contact, the 5th contact and the 6th contact；
Described first relay, the second relay the first contact and the second contact between each through inductance coil connect, the second contact of described first relay is connected with the first end of described 3rd electric capacity, the second contact of described second relay is connected with the second end of described 3rd electric capacity, the first contact of described first relay is connected with the first contact of described second relay；
Described control circuit for controlling described first relay, the 3rd contact of the second relay and the conducting of the 6th contact, the 4th contact and the 5th contact and disconnection by described inductance coil；
Wherein, described first live wire end, the first zero line side are connected with the 3rd contact of described first relay, the 4th contact respectively, as the first voltage output end of described isolation circuit behind the 5th contact of described first relay and described 6th contact connection；Described second live wire end, the second zero line side are connected with the 3rd contact of described second relay, the 4th contact respectively, the 5th contact of described second relay and the 6th contact connect after as the second voltage output end of described isolation circuit.
9. power driving circuit according to claim 7; it is characterized in that; described protection circuit includes: electric fuse and the 6th electric capacity; described electric fuse one end is connected with the first live wire end or the first zero line side, the other end is connected with described 6th electric capacity one end, and the other end of described 6th electric capacity is connected with described first zero line side or the first live wire end.
10. a LED lamp tube, it is characterised in that described LED lamp tube includes any one power driving circuit of claim 1-9.
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| CN201610332938.2A CN105813274B (en) | 2016-05-17 | 2016-05-17 | A kind of power driving circuit and LED lamp tube |
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| CN201610332938.2A CN105813274B (en) | 2016-05-17 | 2016-05-17 | A kind of power driving circuit and LED lamp tube |
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| CN105813274B CN105813274B (en) | 2018-05-15 |
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| CN106870974A (en) * | 2017-03-01 | 2017-06-20 | 深圳驰迅科技有限公司 | A kind of Multi-function compatible type fluorescent tube |
| CN111542147A (en) * | 2020-06-01 | 2020-08-14 | 厦门普为光电科技有限公司 | Lamp tube with electric shock protection and compatible electronic ballast and power frequency AC power supply |
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| CN105813274B (en) | 2018-05-15 |
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