CN212628510U - Double-end LED straight tube of protection against electric shock - Google Patents
Double-end LED straight tube of protection against electric shock Download PDFInfo
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- CN212628510U CN212628510U CN202020999435.2U CN202020999435U CN212628510U CN 212628510 U CN212628510 U CN 212628510U CN 202020999435 U CN202020999435 U CN 202020999435U CN 212628510 U CN212628510 U CN 212628510U
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Abstract
The utility model discloses a bi-polar LED straight tube of protection against electric shock. The technical problems that in the prior art, a single-ended lamp tube is inconvenient to wire and install, and a lamp tube with two ends electrified is easy to have an electric shock accident are solved; the utility model comprises a lamp tube, a drive plate and a light source plate, wherein the drive plate and the light source plate are arranged in the lamp tube, a plurality of LED loads are arranged on the light source plate, lamp caps are arranged at both ends of the lamp tube, and at least one pin for receiving an external drive signal is arranged on each lamp cap; the driving board is provided with a driving circuit for driving the LED load; the driving circuit comprises a rectifying module, a leakage detection switching module and a constant current driving module which are connected in sequence; the input end of the rectifying module is respectively connected with the two lamp cap pins, and the output end of the constant current driving module is connected with the LED load. The risk of electrocution is solved through the mode that resistance and electric capacity partial pressure principle detected the electric leakage, safe and reliable. The double-end power feeding design has simple structure and convenient installation and wiring.
Description
Technical Field
The invention relates to the technical field of LED lighting, in particular to an electric shock prevention double-end LED straight pipe.
Background
With the enhancement of environmental awareness, the requirement for energy conservation is higher and higher, and the LED illumination is widely applied. Most of the lamp tube products are single-end power-in, but the lamp tube with single-end power-in causes wiring trouble, increases labor cost for replacing the lamp tube, and needs to change the fittings in the original lamp. The original certified lamp can not conform to the certification any more by changing the accessories of the original lamp. However, in the current LED lamp with two power inputs, when one end of the LED lamp is inserted into the socket and the other end is not inserted into the socket, if a user touches a metal or conductive part that is not inserted into the socket, a loop will be formed with the ground, resulting in an electric shock.
For example, a "single-end power supply LED intelligent lighting fixture" disclosed in chinese patent literature, whose publication No. CN207935772U includes a detection module, a control module, and a power supply module, where the control module processes information transmitted by the detection module and controls the operation of the power supply module according to the processing result, and the fixture has a complex structure and only supports single-end power supply.
The existing straight pipes with double ends for charging are also available in the market, but the mode for detecting electric leakage is generally pulse current detection, the electric leakage is detected by comparing the magnitude of current, and the safety is low. For example, a "LED straight lamp" disclosed in chinese patent document, whose publication number CN201610160152 includes a lamp tube, two lamp caps, a rectifying circuit, a filter circuit, an LED driving module configured to generate a driving signal and a detecting module, and having a first detecting terminal and a second detecting terminal, the straight lamp utilizes a pulse switch circuit to detect the magnitude of current for detection, the circuit and structure are complex, the safety and reliability are not high, because there is still an electric shock risk when each pulse is turned on.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the technical problems that the wiring and the installation of a single-end lamp tube are inconvenient, the lamp tube with two ends electrified is easy to have electric shock accidents and the safety and the reliability of the pulse current detection leakage are low; the utility model provides a bi-polar LED straight tube of protection against electric shock, simple structure, simple to operate solves the risk of electric shock, safe and reliable through the mode that resistance-capacitance detects the electric leakage.
The above technical problem of the present invention can be solved by the following technical solutions:
an electric shock prevention double-end LED straight pipe comprises a lamp tube, a driving plate and a light source plate, wherein the driving plate and the light source plate are arranged in the lamp tube, a plurality of LED loads are arranged on the light source plate, lamp caps are arranged at two ends of the lamp tube, and at least one pin for receiving an external driving signal is arranged on each lamp cap; the driving board is provided with a driving circuit for driving the LED load; the driving circuit comprises a rectifying module, a leakage detection switching module and a constant current driving module which are connected in sequence; the input end of the rectifying module is respectively connected with the two lamp cap pins, and the output end of the constant current driving module is connected with the LED load.
The lamp tube has the advantages that the structure is simple, the lamp caps are arranged at the two ends of the lamp tube, the pins of the lamp caps are connected with the live line and the zero line, alternating voltage is provided for the internal driving circuit, electricity is fed from the two ends, and the wiring and the installation of the lamp tube are more convenient. The rectifying module and the constant current driving module form a driving main loop, the rectifying module and the electric leakage detection switching module form a voltage division detection control loop, the voltage division detection control loop is adopted to detect the voltage in the driving circuit, when a person replaces and installs a lamp tube, a human body resistor is connected in series in the circuit, the voltage detected by the voltage division detection control loop changes, the electric leakage is judged, the electric shock risk exists, and the voltage division detection control loop controls the driving main loop to be disconnected, so that the electric shock risk is solved, and the safety and the reliability are realized.
Preferably, the leakage detection switching module comprises a resistance-capacitance voltage division loop, a logic judgment loop and a controllable switch K; the input end of the constant current driving module is connected with the output end of the rectifying module, and the controllable switch K is connected between the input end of the constant current driving module and the output end of the rectifying module in series; the resistance-capacitance voltage division loop is connected with the two output ends of the rectification module in parallel, the input end of the logic judgment loop is connected with the detection end of the resistance-capacitance voltage division loop, and the output end of the logic judgment loop is connected with the control end of the controllable switch K.
The resistance-capacitance voltage division loop divides the direct-current voltage rectified by the rectifying module, and the logic judgment loop detects the voltage divided by the resistance-capacitance voltage division loop. The controllable switch K is arranged in the constant current driving circuit, and is closed under the normal condition, and the constant current driving circuit is conducted; when a resistor of a person is connected in series to enter the circuit, the voltage fluctuation of a detection point of the logic judgment loop is reduced, and at the moment, the logic judgment loop outputs a control signal to control the controllable switch K to be switched off, so that the whole driving circuit is switched off, the person is prevented from getting an electric shock, and the safety and the reliability are realized.
Preferably, the resistor-capacitor voltage division circuit comprises a resistor R1 and a capacitor C1, a first end of the capacitor C1 is connected to the positive output end of the rectifier module, a second end of the capacitor C1 is connected to the first end of the resistor R1, a second end of the resistor R1 is connected to the negative output end of the rectifier module, and a first end of the resistor R1 is used as a detection end of the resistor-capacitor voltage division circuit. The voltage input to the detection end of the logic judgment module is the voltage drop on the resistor R1, and the circuit structure is simple.
Preferably, the logic judgment loop comprises a comparator U1, a resistor R2 and a resistor R3, wherein a first end of the resistor R2 is connected with a detection end of the resistance-capacitance voltage division loop, and a second end of the resistor R2 is connected with an inverting end of the comparator U1; the first end of the resistor R3 is connected with a power supply VCC, the second end of the resistor R3 is connected with the in-phase end of the comparator U1, and the output end of the comparator U1 is connected with the control end of the controllable switch K. The comparator U2 is arranged to judge whether the resistance of the human body is connected into the driving circuit, so that the circuit is simple and the reliability is high.
Preferably, the logic determination circuit is a hysteresis comparator, the logic determination circuit further includes a resistor R4 and a resistor R5, a first end of the resistor R4 is connected to the output end of the comparator U1, a second end of the resistor R4 is connected to the control end of the controllable switch K, a first end of the resistor R5 is connected to the second end of the resistor R3, and a second end of the resistor R5 is connected to the second end of the resistor R4. And hysteresis comparison is used, so that the ringing effect is avoided, and the anti-interference effect is realized.
Preferably, the constant current driving module includes a constant current driving chip. The structure is simple.
Preferably, the constant current driving chip has three modes, namely BUCK mode, BUCK-BOOST mode and BOOST mode. The three constant current driving modes are various in adjustment, suitable for different scenes and strong in adaptability.
Preferably, the lamp tube is a PC tube or a glass tube. The PC tube or the glass tube is not conductive, so that the lamp tube can be touched by a person during installation, electric shock is avoided, and the lamp tube is convenient to install on the basis of ensuring safety. And the PC material and the glass are convenient to manufacture and simple to prepare.
Preferably, the lamp tube is tubular and has any shape. The models such as T5, T6, T8, T9, T10, T12, U-shaped, annular and the like are various, are suitable for various use scenes and meet the diversified requirements of users.
The utility model has the advantages that:
1. the risk of electrocution is solved through the mode that resistance and electric capacity partial pressure principle detected the electric leakage, safe and reliable.
2. The double-end power feeding design has the advantages of simple structure, simplicity in installation and convenience in wiring.
Drawings
Fig. 1 is an explosion diagram of the double-end LED straight tube of the present invention.
Fig. 2 is a block diagram of the connection structure of the driving circuit of the present invention.
Fig. 3 is a circuit connection diagram of the leakage detection switching module according to the first embodiment of the present invention.
Fig. 4 is a circuit connection diagram of the leakage detection switching module according to the second embodiment of the present invention.
In the figure, 1, a lamp tube, 2, a lamp holder, 3, a driving board, 4, a light source board, 5, a rectifying module, 6, a leakage detection switching module, 61, a resistance-capacitance voltage division circuit, 62, a logic judgment circuit, 7, a constant current driving module and 8, an LED load.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
The first embodiment is as follows:
an electric shock prevention double-end LED straight tube is shown in figure 1 and comprises a lamp tube 1, two lamp caps 2, a driving plate 4 and a light source plate 3. The driving board 4 and the light source board 3 are disposed in the lamp tube 1.
The lamp tube 1 is a PC tube or a glass tube. The PC tube or the glass tube is not conductive, so that a person can touch the lamp tube 1 during installation, electric shock is avoided, and the lamp tube is convenient to install on the basis of ensuring safety. And the PC material and the glass are convenient to manufacture and simple to prepare.
The lamp tube 1 is tubular and has any shape. The models such as T5, T6, T8, T9, T10, T12, U-shaped, annular and the like are various, are suitable for various use scenes and meet the diversified requirements of users.
The lamp caps 2 are respectively arranged at two ends of the lamp tube 1. Each base 2 has at least one pin for receiving an external driving signal. In this embodiment, each base 2 has two pins for receiving external driving signals. An external driving signal is alternating current commercial power, and the pins 2 of the two lamp holders are respectively connected with a live wire L and a zero line N. The electricity is fed from two ends, and the wiring and the installation of the lamp tube 1 are more convenient.
A plurality of LED loads 8 are provided on the light source board 3.
The driving board 4 is provided with a driving circuit for driving the LED load 8. The input end of the driving circuit is respectively connected with the two pins of the lamp holder 2, and the output end of the driving circuit is connected with the LED load 8.
As shown in fig. 2, the driving circuit includes a rectifying module 5, a leakage detection switching module 6, and a constant current driving module 7. The rectifying module 5 and the constant current driving module 7 form a driving main loop, and the rectifying module 5 and the electric leakage detection switching module 6 form a voltage division detection control loop.
The input end of the rectifier module 5 is respectively connected with the two lamp holder 2 pins, the positive input end of the rectifier module 5 is connected with the lamp holder 2 pin connected with the live wire L, and the negative input end of the rectifier module 5 is connected with the lamp holder 2 pin connected with the zero line N.
The input end of the constant current driving module 7 is connected with the output end of the rectifying module 5, and the output end of the constant current driving module 7 is connected with the LED load 8.
The constant current driving module 7 comprises a constant current driving chip, and the constant current driving chip has three modes of BUCK, BUCK-BOOST and BOOST. The three constant current driving modes are various in adjustment, suitable for different scenes and strong in adaptability.
As shown in fig. 3, the leakage detection switching module 6 includes a resistor-capacitor voltage divider circuit 61, a logic determination circuit 62, and a controllable switch K. The controllable switch K can be an electromagnetic switch or an MOS tube.
The controllable switch K is connected in series between the input end of the constant current driving module 7 and the output end of the rectifying module 5.
The resistance-capacitance voltage division loop is connected with two output ends of the rectifier module 5 in parallel, the input end of the logic judgment loop 62 is connected with the detection end of the resistance-capacitance voltage division loop 61, and the output end of the logic judgment loop 62 is connected with the control end of the controllable switch K.
The rc voltage divider circuit 61 includes a resistor R1 and a capacitor C1. The first end of the capacitor C1 is connected to the positive output end of the rectifier module 5, the second end of the capacitor C1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the negative output end of the rectifier module 5, and the first end of the resistor R1 is used as the detection end of the resistor-capacitor voltage division loop 61.
The logic judgment loop 62 preferably comprises a comparator U1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5.
A first end of the resistor R2 is connected to a detection end of the resistor-capacitor voltage division circuit 61, i.e., a second end of the resistor R1, and a second end of the resistor R2 is connected to an inverting end of the comparator U1; the first end of the resistor R3 is connected with a power supply VCC, the second end of the resistor R3 is connected with the in-phase end of the comparator U1, the first end of the resistor R4 is connected with the output end of the comparator U1, the second end of the resistor R4 is connected with the control end of the controllable switch K, the first end of the resistor R5 is connected with the second end of the resistor R3, and the second end of the resistor R5 is connected with the second end of the resistor R4. The power VCC provides reference voltage, and the reference voltage is set between the voltage which is not connected with the 500 ohm equivalent resistance of the human body and the voltage which is connected with the 500 ohm equivalent resistance of the human body.
The comparator U2 is arranged to judge whether the resistance of the human body is connected into the driving circuit, so that the circuit is simple and the reliability is high. The hysteresis comparator is formed to avoid ringing effect and resist interference.
The utility model discloses a bi-polar LED straight tube, through advancing the electricity from both ends, it is more convenient to compare in single-ended wiring and the installation of advancing electric fluorescent tube 1.
Under normal conditions, the controllable switch K is closed, and the driving circuit can be normally conducted.
When in the fluorescent tube installation, when someone's resistance inserts in drive circuit, the voltage that comparator U1 inverting input detected reduces, and the comparator output high level is less than behind the reference voltage, and controllable switch K disconnection is controlled to the whole drive circuit of disconnection, guarantee human safety avoids electrocuteeing.
Example two:
an electric shock prevention double-end LED straight tube is shown in figure 1 and comprises a lamp tube 1, two lamp caps 2, a driving plate 4 and a light source plate 3. The driving board 4 and the light source board 3 are disposed in the lamp tube 1.
This use is novel to optimize leakage detection switch module 6 on drive plate 4.
The leakage detection switching module 6 includes a detection control chip U2, a capacitor C1, a resistor R1, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a diode D1. The model of the detection control chip is TA 88. The detection control chip is a voltage detection chip, and is safer and higher in accuracy compared with current detection voltage detection. The controllable switch K is an MOS tube arranged in the chip, and the on-off of the MOS tube is more reliable to control compared with the on-off of a mechanical switch.
A first end of the resistor R1 is connected with the positive output end of the rectifying module 5, a second end of the resistor R1 is connected with a first end of the capacitor C1, and a second end of the capacitor C1 is connected with the negative output end of the rectifying module 5; a first end of the capacitor C1 is connected with a power supply end of the detection control chip U2, a first end of the resistor R6 is connected with a first end of the resistor R7, and a second end of the resistor R6 is respectively connected with a grounding end of the detection control chip U2 and a second end of the capacitor C1; the second end of the resistor R7 is connected with the voltage detection end of the detection control chip U2, the first end of the resistor R8 is connected with the first end of the resistor R7, the second end of the resistor R8 is connected with the isolation output end of the detection control chip U2, and the isolation output end of the detection control chip U2 is connected with the input end of the constant current driving module 7; a first end of the resistor R9 is connected with a current detection end of the detection control chip U2, a second end of the resistor R9 is connected with a grounding end of the detection control chip U2, an anode of the diode D1 is connected with a first end of the resistor R9, and a cathode of the diode D1 is connected with a second end of the resistor R9; the second end of the resistor R9 is connected to the second end of the capacitor C1.
The power supply end is VCC, the voltage detection end is VS, the isolation output end is DRN, the current detection end is CS, the grounding end is GND, and the controllable switch K is an MOS (metal oxide semiconductor) tube. An MOS tube is arranged in an isolation output end of the detection control chip U2, and the on-off of the MOS tube is controlled to control the on-off of the whole driving main loop.
The resistor R1 and the capacitor C1 supply power to the detection control chip U1, and the resistor R6, the resistor R7 and the resistor R8 provide voltage for detection of the detection control chip U2; the resistance of the human body is about 500 ohms, and the threshold value of voltage fluctuation is artificially set for 500 ohms in the detection control chip U2. When a human body is connected into the driving loop, the voltage fluctuation detected by the detection control chip U2 is reduced, the voltage fluctuation is compared with a corresponding threshold value built in the detection control chip U2, and the internal MOS tube is turned off if the voltage fluctuation is larger than or equal to the threshold value, so that the driving main loop is disconnected, the safety of the human body is ensured, and electric shock is avoided.
In this embodiment, only the leakage detection switching module 6 is optimized, and the other settings are the same as those in the first embodiment.
Under normal conditions, the controllable switch K is closed by the MOS tube in the detection control chip U2, and the driving circuit can be normally conducted.
When a resistor of a person is connected into the driving circuit in the installation process of the lamp tube, the voltage detected by the voltage detection end of the detection control chip U2 is reduced in fluctuation, the voltage fluctuation is compared with the threshold value in the detection control chip U2, and if the voltage fluctuation is larger than or equal to the set threshold value, the MOS tube in the detection control chip U2 is cut off, so that the driving main loop is disconnected, the safety of a human body is guaranteed, and electric shock is avoided.
Claims (6)
1. An electric shock prevention double-end LED straight tube comprises a lamp tube (1), a driving plate (4) and a light source plate (3), wherein the driving plate (4) and the light source plate (3) are arranged in the lamp tube (1), and a plurality of LED loads (8) are arranged on the light source plate (3), and the electric shock prevention double-end LED straight tube is characterized in that lamp caps (2) are arranged at two ends of the lamp tube (1), and at least one pin for receiving an external driving signal is arranged on each lamp cap (2); a driving circuit for driving the LED load (8) is arranged on the driving plate (4); the driving circuit comprises a rectifying module (5), a leakage detection switching module (6) and a constant current driving module (7) which are connected in sequence; the input end of the rectifying module (5) is respectively connected with two lamp cap (2) pins, and the output of the constant current driving module (7) is connected with an LED load (8);
the electric leakage detection switching module (6) comprises a resistance-capacitance voltage division circuit (61), a logic judgment circuit (62) and a controllable switch K; the input end of the constant current driving module (7) is connected with the output end of the rectifying module (5), and the controllable switch K is connected between the input end of the constant current driving module (7) and the output end of the rectifying module (5) in series; the resistance-capacitance voltage division loop is connected with two output ends of the rectification module (5) in parallel, the input end of the logic judgment loop (62) is connected with the detection end of the resistance-capacitance voltage division loop (61), and the output end of the logic judgment loop (62) is connected with the control end of the controllable switch K; the resistance-capacitance voltage division loop divides the direct-current voltage rectified by the rectifying module, and the logic judgment loop detects the voltage magnitude divided by the resistance-capacitance voltage division loop;
the logic judgment loop (62) comprises a comparator U1, a resistor R2 and a resistor R3, wherein the first end of the resistor R2 is connected with the detection end of the resistance-capacitance voltage division loop (61), and the second end of the resistor R2 is connected with the inverting end of the comparator U1; the first end of the resistor R3 is connected with a power supply VCC, the second end of the resistor R3 is connected with the in-phase end of the comparator U1, and the output end of the comparator U1 is connected with the control end of the controllable switch K.
2. The electric shock prevention double-ended LED straight tube as claimed in claim 1, wherein the resistance-capacitance voltage division circuit (61) comprises a resistor R1 and a capacitor C1, a first end of the capacitor C1 is connected with a positive output end of the rectifying module (5), a second end of the capacitor C1 is connected with a first end of a resistor R1, a second end of the resistor R1 is connected with a negative output end of the rectifying module (5), and a first end of a resistor R1 is used as a detection end of the resistance-capacitance voltage division circuit (61).
3. The electric shock preventing double-ended LED straight tube as claimed in claim 1, wherein the logic judgment circuit (62) is a hysteresis comparator, the logic judgment circuit (62) further comprises a resistor R4 and a resistor R5, a first end of the resistor R4 is connected with an output end of the comparator U1, a second end of the resistor R4 is connected with a control end of the controllable switch K, a first end of the resistor R5 is connected with a second end of the resistor R3, and a second end of the resistor R5 is connected with a second end of the resistor R4.
4. The electric shock prevention double-end LED straight tube as claimed in claim 1, wherein the constant current driving module (7) comprises a constant current driving chip.
5. The electric shock prevention double-end LED straight tube of claim 4, wherein the constant current driving chip has three modes, namely BUCK mode, BUCK-BOOST mode and BOOST mode.
6. The electric shock preventing double-ended LED straight tube according to claim 1, wherein the lamp tube (1) is a PC tube or a glass tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020999435.2U CN212628510U (en) | 2020-06-03 | 2020-06-03 | Double-end LED straight tube of protection against electric shock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020999435.2U CN212628510U (en) | 2020-06-03 | 2020-06-03 | Double-end LED straight tube of protection against electric shock |
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| Publication Number | Publication Date |
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| CN212628510U true CN212628510U (en) | 2021-02-26 |
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| CN202020999435.2U Active CN212628510U (en) | 2020-06-03 | 2020-06-03 | Double-end LED straight tube of protection against electric shock |
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| CN (1) | CN212628510U (en) |
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