CN212344104U - LED fluorescent tube based on silicon controlled rectifier adjusts luminance - Google Patents
LED fluorescent tube based on silicon controlled rectifier adjusts luminance Download PDFInfo
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- CN212344104U CN212344104U CN202021205353.2U CN202021205353U CN212344104U CN 212344104 U CN212344104 U CN 212344104U CN 202021205353 U CN202021205353 U CN 202021205353U CN 212344104 U CN212344104 U CN 212344104U
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Abstract
The utility model relates to a LED fluorescent tube based on silicon controlled rectifier adjusts luminance, all be provided with the fluorescent tube that two participate in including both ends to and install the drive circuit who has two power receiving ends in the fluorescent tube, participate in behind the short circuit and be coupled with two power receiving ends respectively at fluorescent tube both ends, drive circuit is including rectifier module, filtering module and the constant current module that couples in proper order, constant current module includes switching element, energy storage afterflow unit and controller, and the controller has the signal input part who accepts outside dimming signal regulation PWM signal duty cycle, and outputs the signal output part of PWM signal in order to control its break-make to switching element, and one of them power receiving end and silicon controlled rectifier are coupled of fluorescent tube. The controllable and controllable light modulator is coupled with one of two power receiving ends of the LED lamp tube, the power receiving ends simultaneously supply power to the driving circuit and the light modulator, and the light modulator can realize whole-course light modulation on the LED lamp tube, so that the cost is effectively saved.
Description
Technical Field
The utility model relates to a LED lamp especially relates to a LED fluorescent tube based on silicon controlled rectifier adjusts luminance.
Background
The LED lighting is widely applied to various industries, has the advantages of long service life, high efficiency and the like, and the LED driving power supply is an indispensable driving device of the LED lamp. With the development of lighting technology and the requirements on energy conservation and environmental protection, more and more LED lamps need to be dimmed.
In the prior art, the output power of an LED lamp is controlled by adjusting and controlling an LED driving power supply to achieve the purpose of dimming, wherein silicon controlled dimming is a common control method. However, in order to directly replace the conventional fluorescent tube, some LED tubes also adopt double-end power supply, and when the LED tubes are installed, if one end of the LED tubes is powered on and a human body just touches the other end of the LED tubes, there is a risk of electric shock, so a leakage detection module is generally arranged in a driving circuit, but the leakage detection module is incompatible with silicon controlled dimming, and thus there is a certain limitation when selecting an adaptive dimmer. And generally, the dimmers are all coupled to the branch circuit outside the two power supply terminals for individually controlling dimming, which increases the number of electrical components and is costly.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need to provide a triac dimming based LED tube that solves at least one of the problems.
An LED lamp tube based on silicon controlled rectifier dimming comprises a lamp tube and a driving circuit, wherein two pins are arranged at two ends of the lamp tube, the driving circuit is arranged in the lamp tube and provided with two power receiving ends, and the pins at the two ends of the lamp tube are in short circuit and are respectively coupled with the two power receiving ends; the driving circuit comprises a rectifying module, a filtering module and a constant current module which are sequentially coupled, the constant current module comprises a switching element, an energy storage follow current unit and a controller,
the controller is provided with a signal input end for receiving an external dimming signal to adjust the duty ratio of the PWM signal and a signal output end for outputting the PWM signal to the switching element to control the on-off of the switching element, and one power receiving end of the lamp tube is coupled with the silicon controlled rectifier dimmer.
Preferably, the switching element is a power MOS transistor;
the drain electrode of the power MOS tube is coupled with the energy storage follow current unit;
the grid electrode of the power MOS tube is coupled with the signal output end of the controller;
the power MOS tube source electrode is coupled with the source electrode connection of the controller.
Preferably, a triode and a resistor for improving the response speed of the power MOS transistor are further coupled between the gate of the power MOS transistor and the signal output terminal of the controller.
Preferably, the collector of the triode is coupled with the power supply end of the controller;
the base electrode of the triode is coupled with the signal output end of the controller;
the emitter of the triode is coupled with the grid of the power MOS tube;
the resistor is connected between the base electrode of the triode and the grid electrode of the power MOS tube in series.
Preferably, an installation detection module for controlling the on/off of the driving circuit is further arranged between the output end of the rectification module and the filtering unit.
Preferably, the installation detection module includes:
a switching tube;
the voltage acquisition port is used for acquiring the current input into the driving circuit;
the current acquisition port is used for acquiring voltage loaded at the input end of the driving circuit;
the impedance calculator calculates the impedance of the driving circuit by using the voltage and the current;
and the impedance comparator compares the impedance with a set value to control the on-off of the switch tube.
Preferably, the output end of the rectification module is coupled to the signal input end of the controller.
Preferably, the driving circuit further comprises an anti-jamming module coupled to an input terminal of the rectifying module.
According to the LED lamp tube based on silicon controlled rectifier dimming, the controllable regulator dimmer is coupled with one end of the two power receiving ends of the LED lamp tube, the power receiving ends simultaneously supply power to the driving circuit and the dimmer, the dimmer can achieve whole-course dimming on the LED lamp tube, and therefore cost is effectively saved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an LED lamp according to the present application;
FIG. 2 is a schematic diagram of the connection between the installation detection module and the peripheral circuit in the LED lamp tube according to the present invention;
FIG. 3 is a schematic structural diagram of an installation detection module in an LED lamp tube according to the present application;
FIG. 4 is a circuit diagram of a constant current module in an LED lamp tube according to the present application;
fig. 5 is a circuit diagram between the power receiving terminal and the constant current module in the LED lamp of the present application.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, the present application provides an LED lamp tube based on silicon controlled rectifier dimming, which includes a lamp tube having two pins at two ends thereof, and a driving circuit installed in the lamp tube and having two power receiving ends, wherein the pins at two ends of the lamp tube are short-circuited and then coupled to the two power receiving ends respectively. The driving circuit comprises a rectifying module, a filtering module and a constant current module which are sequentially coupled, wherein the constant current module comprises a switching element, an energy storage follow current unit and a controller. The controller is provided with a signal input end for receiving an external dimming signal to adjust the duty ratio of the PWM signal and a signal output end for outputting the PWM signal to the switching element to control the on-off of the switching element, and one power receiving end of the lamp tube is coupled with the silicon controlled rectifier dimmer.
In this embodiment, both ends of the LED lamp tube are power receiving ends, one end of the LED lamp tube is coupled to the live wire of the commercial power, the other end of the LED lamp tube is coupled to the zero line of the commercial power, and one of the power receiving ends is connected to a silicon controlled dimmer for controlling the brightness of the LED lamp tube. Therefore, the driving circuit is simplified, the use of electric elements is reduced, and the cost is reduced.
In this embodiment, the dimmer adopts silicon controlled rectifier dimming, the phase angle of the alternating current input to the driving circuit is adjusted by the silicon controlled rectifier dimmer, and then the controller performs logic judgment on the phase angle to output a PWM signal corresponding to the phase angle to control the on-off of the switching element, so as to achieve the purpose of adjusting the brightness of the LED lamp tube.
In this embodiment, the scr dimmer can be coupled to any power receiving terminal.
In order to avoid electric shock caused by leakage current generated when an operator touches the other power receiving end after one power receiving end is connected to a power supply when the LED lamp tube is installed, an installation detection module for controlling the on-off of the driving circuit is further arranged between the output end of the rectification module and the filtering module. The conduction or the disconnection of the driving circuit is controlled by detecting the leakage current of the installation detection module so as to avoid the risk of electric shock
As shown in fig. 2, a current sampling circuit and a voltage sampling circuit are disposed on the periphery of the mounting detection module, and are respectively connected to a pin CS and a pin VS of the mounting detection module, and the pin CS and the pin VS are respectively used as a current sampling port and a voltage sampling port of the mounting detection module.
The current sampling circuit comprises a resistor RS1 connected to the ground and a diode D4 connected in parallel with the resistor RS1, and the current sampling circuit collects current input into the driving circuit.
The voltage sampling circuit comprises a resistor R3, a resistor R4, a resistor R5 and a diode D2, and a pin VS is connected with a node between the resistor R5 and the anode of the diode D2 to collect the voltage input into the driving circuit.
As shown in fig. 3, the installation detection module includes a voltage memory, a current memory, an impedance calculator, an impedance comparator, a state machine, a gate driver, and a switch tube. The voltage memory is used for storing the voltage collected by the sampling circuit, and the current memory is used for storing the current collected by the sampling circuit.
The collected voltage and current are input into an impedance calculator, the current impedance of the driving current is obtained through calculation, the impedance is input into an impedance comparator and compared with a preset value, if the impedance is larger than the preset value (for example, 500 ohms), namely the current is leakage current, and the risk of electric shock exists, the switch tube is turned off through a gate switch, and the current does not flow through the LED lamp tube. If the current is smaller than the preset value, the LED lamp tube is installed in place at the moment, and the switch tube is conducted through the gate switch, so that the current flows through the LED lamp tube and works normally.
As shown in fig. 4, the switching element is a power MOS transistor Q1, the drain of the power MOS transistor Q1 is coupled to the energy storage freewheeling unit, the gate of the power MOS transistor Q1 is coupled to the signal output terminal of the controller, and the source of the power MOS transistor Q1 is coupled to the source connection terminal of the controller.
In this embodiment, the controller is a single chip microcomputer U1 with model number SY 5852. The single chip microcomputer U1 comprises a VIN pin, an IBUS pin, a SOURCE pin and a GATE pin. The VIN pin is a power supply terminal, the IBUS pin is a signal input terminal, the GATE pin is a signal output terminal, and the SOURCE pin is a SOURCE electrode connecting terminal. The single chip microcomputer U1 further comprises a built-in MOS tube, and the resistance value of the MOS tube is smaller than that of an external power MOS tube Q1.
The output end of the filtering module is coupled with the VIN pin to supply power to the VIN pin.
The output terminal of the rectifying module is coupled to the IBUS pin through an anti-reverse diode D3 to send the phase angle signal.
After the single chip microcomputer U1 receives the phase angle signal, two PWM signals with the corresponding duty ratio of the phase angle are calculated through internal logic, wherein one PWM signal is input to the grid electrode of the built-in MOS tube, and the other PWM signal is input to the grid electrode of the power MOS tube Q1 through the signal output end so as to drive the two MOS tubes respectively. The driving force of the PWM signal output to the built-in MOS tube is far smaller than that of the PWM signal output to the power MOS tube Q1.
The SOURCE of a built-in MOS tube in the singlechip U1 is coupled with a SOURCE pin and is connected with a power MOS tube Q1 outside the singlechip U1 in series. The PWM signal power obtained by the phase angle and the internal logic calculation of the single chip microcomputer is large, after the PWM signal power is input into the built-in MOS tube of the single chip microcomputer, because the resistance value of the built-in MOS tube is small, if the built-in MOS tube is directly used as a switching element, the built-in MOS tube is easy to damage, the power MOS tube Q1 is arranged to be connected with the built-in MOS tube of the single chip microcomputer U1 in series, so that the PWM signal power is shared, and the LED lamp tube is dimmed through the power MOS tube Q1.
The signal output end of the singlechip U1 outputs a PWN signal with larger driving force to the grid of the power tube MOS tube Q1, and the on-off duty ratio of the power tube MOS tube Q1 is adjusted to control the output power of the constant current module, so that the aim of dimming is finally fulfilled.
Because parasitic capacitance can be generated on the grid and the source of the power MOS tube Q1, the power MOS tube Q1 plays a role of a switch, and a higher switching frequency can be generated in work, a grid signal has an alternating current characteristic, the higher the frequency is, the more obvious the alternating current characteristic is, the parasitic capacitance generates grid current through alternating current, and accordingly the on and off of the power MOS tube Q1 are correspondingly delayed, and when a dimmer of the power MOS tube Q1 is used for dimming, an LED lamp cannot respond timely. This requires a strong gate drive so that the power MOS transistor Q1 can overcome the influence of the parasitic capacitance and respond quickly to its control. In order to solve the problem that the PWM signal outputted from the signal output terminal of the single chip is not strong enough, a transistor Q2 and a resistor R9 are coupled between the gate of the power MOS and the signal output terminal of the controller. The driving signal of the gate of the input power MOS tube is amplified by the amplifying function of the triode Q2.
In one embodiment, the collector of the transistor Q2 is coupled to the power supply terminal of the controller, the base of the transistor Q2 is coupled to the gate terminal of the controller, the emitter of the transistor Q2 is coupled to the gate of the power MOS transistor Q1, and the resistor R9 is connected in series between the base of the transistor Q2 and the gate of the power MOS transistor Q1. In this embodiment, the driving circuit includes a rectifying module, a filtering module and a constant current module, which are coupled in sequence. The driving circuit is connected with alternating current, then carries out rectification and filtering through the rectification module and the filtering module, converts the alternating current into direct current, then supplies power to the LED lamp tube through the constant current module, and supplies power to the LED through the constant current module, so that the characteristic that the brightness of the LED is influenced by current is met. As far as the constant current module itself is concerned, conventional techniques can be employed.
As shown in fig. 5, the input end of the driving circuit is provided with an ac filtering module, which includes a resistor R1 and a resistor R2 connected in series to the two power receiving ends N and L, respectively.
In one embodiment, the rectifier module adopts a bridge stack DB1, and is connected to the filter module and the installation detection module after rectification.
In one embodiment, the filtering module adopts a resistor R5, an inductor L1, a capacitor CX1 and a capacitor CX1, and is connected to the constant current module after filtering.
In one embodiment, the energy storage freewheeling unit in the constant current module includes an energy storage inductor T1 and a freewheeling diode D2.
In this embodiment, the driving circuit further includes an anti-interference module coupled to the input terminal of the rectifying module.
In one embodiment, the immunity module includes an inductor L2, a resistor R17 and a capacitor CX4 coupled to one input terminal of the bridge DB 1.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. The LED lamp tube based on silicon controlled rectifier dimming comprises a lamp tube and a driving circuit, wherein two pins are arranged at two ends of the lamp tube, the driving circuit is arranged in the lamp tube and provided with two power receiving ends, and the pins at the two ends of the lamp tube are in short circuit and are respectively coupled with the two power receiving ends; it is characterized in that the driving circuit comprises a rectifying module, a filtering module and a constant current module which are sequentially coupled, the constant current module comprises a switching element, an energy storage follow current unit and a controller,
the controller is provided with a signal input end for receiving an external dimming signal to adjust the duty ratio of the PWM signal and a signal output end for outputting the PWM signal to the switching element to control the on-off of the switching element, and one power receiving end of the lamp tube is coupled with the silicon controlled rectifier dimmer.
2. The LED lamp tube according to claim 1, wherein the switching element is a power MOS tube; the drain electrode of the power MOS tube is coupled with the energy storage follow current unit;
the grid electrode of the power MOS tube is coupled with the signal output end of the controller;
and the source electrode of the power MOS tube is coupled with the source electrode connecting end of the controller.
3. The LED lamp tube according to claim 2, wherein a transistor and a resistor for increasing the response speed of the power MOS transistor are further coupled between the gate of the power MOS transistor and the signal output terminal of the controller.
4. The LED tube of claim 3,
the triode collector is coupled with the power supply end of the controller;
the base electrode of the triode is coupled with the signal output end of the controller;
the emitter of the triode is coupled with the grid of the power MOS tube;
the resistor is connected between the base electrode of the triode and the grid electrode of the power MOS tube in series.
5. The LED lamp tube according to claim 1, wherein an installation detection module for controlling the on/off of the driving circuit is further disposed between the output end of the rectification module and the filtering unit.
6. The LED tube according to claim 5, wherein the installation detection module comprises:
a switching tube;
the voltage acquisition port is used for acquiring the current input into the driving circuit;
the current acquisition port is used for acquiring voltage loaded at the input end of the driving circuit;
the impedance calculator calculates the impedance of the driving circuit by using the voltage and the current;
and the impedance comparator compares the impedance with a set value to control the on-off of the switch tube.
7. The LED lamp tube according to claim 1, wherein an output terminal of the rectifying module is coupled to a signal input terminal of the controller.
8. The LED tube of claim 1, wherein the driving circuit further comprises an anti-jamming module coupled to the input of the rectifying module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021205353.2U CN212344104U (en) | 2020-06-24 | 2020-06-24 | LED fluorescent tube based on silicon controlled rectifier adjusts luminance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021205353.2U CN212344104U (en) | 2020-06-24 | 2020-06-24 | LED fluorescent tube based on silicon controlled rectifier adjusts luminance |
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| CN212344104U true CN212344104U (en) | 2021-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113746181A (en) * | 2021-11-04 | 2021-12-03 | 南昌嘉信高科技有限公司 | Charging circuit, charging seat, lamps and lanterns and lamps and lanterns system of lamps and lanterns |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113746181A (en) * | 2021-11-04 | 2021-12-03 | 南昌嘉信高科技有限公司 | Charging circuit, charging seat, lamps and lanterns and lamps and lanterns system of lamps and lanterns |
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