CN214101866U - Protection circuit of LED dimming power supply and LED lamp - Google Patents

Protection circuit of LED dimming power supply and LED lamp Download PDF

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Publication number
CN214101866U
CN214101866U CN202023065447.7U CN202023065447U CN214101866U CN 214101866 U CN214101866 U CN 214101866U CN 202023065447 U CN202023065447 U CN 202023065447U CN 214101866 U CN214101866 U CN 214101866U
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China
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module
resistor
triode
switch
pwm
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Expired - Fee Related
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CN202023065447.7U
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Chinese (zh)
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马中富
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Shanghai Jiayan Intelligent Technology Co ltd
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Shanghai Jiayan Intelligent Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The utility model provides a protection circuit and LED lamps and lanterns of LED power of adjusting luminance, include: the device comprises a PWM cache module, a switch driving module, a switch module, a current feedback module, a PWM filtering module and a protection module; an external PWM signal is connected to the switch module through the PWM cache module and the switch driving module in sequence; the output end of the switch driving module is also connected with the input end of the PWM filtering module; one end of the switch module is connected with the negative end of the LED light source, and the other end of the switch module is respectively connected with the input ends of the current feedback module and the protection module; and the control end of the PWM filtering module is connected with the output end of the protection module. The utility model discloses a hardware circuit utilizes the PWM signal output of triode auto-lock performance control singlechip, owing to do not need the participation of singlechip, can effectively shorten this section time to the switch tube stop work behind transshipping or the short circuit emergence, can not burn out the switch tube to form effectual protection to the switch tube.

Description

Protection circuit of LED dimming power supply and LED lamp
Technical Field
The utility model relates to a lighting technology field especially relates to a protection circuit and LED lamps and lanterns of LED power of adjusting luminance.
Background
The LED lamp is a lamp using a Light Emitting Diode (LED) as a light source, and is generally manufactured using a semiconductor LED. The service life and the luminous efficiency of the LED lamp can be multiple times of those of an incandescent lamp, so that more and more products in the market use the LED lamp to replace the traditional fluorescent lamp tube.
The existing LED lamp strip dimming power supply drives a switch tube to dim light by adjusting a PWM duty ratio through a control chip, and during actual installation, due to field installation errors or overlarge lamp strip load, output short circuit or overlarge switch tube load is easily caused, and the accident that the switch tube is burnt due to long-time overheating happens, so that the switch tube must be protected.
Referring to fig. 1, most manufacturers currently connect two current feedback resistors R16 and R17 to the source of the switching tube Q7, drive the transistor Q8 to feed back to the single chip microcomputer through the resistor R18, interrupt and sample the voltage value of the collector of the transistor Q8 through the single chip microcomputer, determine whether the transistor is overloaded or not, output the voltage value, and output a PWM control signal to turn off the switching tube Q7 to protect the switching tube Q7 when a short circuit or an overload occurs.
By adopting the scheme, the singlechip needs time for processing, sometimes the short circuit response is not very timely, the condition of burning the switch tube still occurs, and in the actual test, 1 to 2 times of short circuit tests still burn the switch tube for 20 times, so that the switch tube cannot be completely and effectively protected.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide a protection circuit and LED lamps and lanterns of LED power of adjusting luminance for solve the problem that the switch tube burns out easily among the prior art.
In order to achieve the above objects and other related objects, the present invention provides a protection circuit for a LED dimming power supply, including: the device comprises a PWM cache module, a switch driving module, a switch module, a current feedback module, a PWM filtering module and a protection module;
the input end of the PWM cache module is connected with an external PWM signal end, and the output end of the PWM cache module is connected with the input end of the switch driving module;
the output end of the switch driving module is respectively connected with the input end of the PWM filtering module and the control end of the switch module;
one end of the switch module is connected with the negative electrode end of the LED light source, and the other end of the switch module is respectively connected with the input ends of the current feedback module and the protection module;
and the control end of the PWM filtering module is connected with the output end of the protection module.
In an embodiment of the present invention, the PWM buffer module includes a transistor Q5 and a plurality of resistors;
one end of the resistor R7 is connected with an external PWM signal end, the other end of the resistor R7 is respectively connected with one end of the resistor R8 and the base electrode of the triode Q5, and the other end of the resistor R8 is grounded; the collector of the triode Q5 is connected with the positive power supply VCC, and the emitter is respectively connected with one end of the resistor R9 and the input end of the switch driving module.
In an embodiment of the present invention, the switch driving module includes a transistor Q6 and a plurality of resistors;
one end of the resistor R10 is connected with the output end of the PWM cache module, and the other end of the resistor R10 is respectively connected with the input end of the PWM filtering module and the base electrode of the triode Q6; the collector of triode Q6 connects positive power VCC, and the projecting pole is connected with resistance R11, the one end of resistance R12 respectively, and the other end ground connection of resistance R11, the other end of resistance R12 with switch module's control end is connected.
In an embodiment of the present invention, the switch module includes a switch tube Q1; the grid electrode of the switching tube Q1 is connected with the output end of the switch driving module, the drain electrode is connected with the negative electrode end of the LED light source, and the source electrode is respectively connected with the input ends of the current feedback module and the protection module.
In an embodiment of the present invention, the current feedback module includes a resistor R1 and a resistor R2;
the resistor R1 and the resistor R2 are connected in parallel, one common end of the parallel connection is grounded, and the other common end of the parallel connection is connected with one end of the switch module and the input end of the protection module respectively.
In an embodiment of the present invention, the PWM filtering module includes a transistor Q4; the base electrode of the triode Q4 is connected with the output end of the protection module, the collector electrode of the triode Q4 is connected with the input end of the switch driving module, and the emitting electrode of the triode Q4 is grounded.
In an embodiment of the present invention, the protection module includes a transistor Q2, a transistor Q3, a capacitor C1, and a plurality of resistors, wherein the transistor Q3 is a PNP-type transistor;
one end of the resistor R3 is respectively connected with the other end of the switch module and the input end of the current feedback module, and the other end of the resistor R3 is respectively connected with the base of the triode Q2, one end of the capacitor C1, one end of the resistor R6 and the output end of the PWM filtering module; the other end of the capacitor C6 and the emitter of the triode Q2 are grounded; the collector of the triode Q2 is respectively connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected with a positive power supply VCC, the other end of the resistor R5 is connected with the base of the triode Q3, the emitter of the triode Q3 is connected with the positive power supply VCC, and the collector of the triode Q3 is connected with the other end of the resistor R6.
The utility model also provides a LED lamp, LED lamp includes the protection circuit of LED lamp and LED power of adjusting luminance, the input and the external PWM signal end of the protection circuit of LED power of adjusting luminance are connected, the output with the negative pole of LED lamp is connected, wherein, the protection circuit of LED power of adjusting luminance is as an arbitrary item in the protection circuit of LED power of adjusting luminance.
As above, the utility model discloses a protection circuit and LED lamps and lanterns of LED power of adjusting luminance has following beneficial effect:
the utility model discloses a hardware circuit utilizes the PWM signal output of triode auto-lock performance control singlechip, has replaced through singlechip sampling feedback current control PWM signal output function among the prior art. Because the participation of the singlechip is not needed, the time from overload or short circuit to the stop of the switching tube can be effectively shortened, the switching tube can not be burnt, and the switching tube can be effectively protected.
Drawings
FIG. 1 is a circuit diagram of a protection circuit of a switching tube disclosed in the prior art
Fig. 2 shows a block diagram of the overall structure disclosed in the embodiment of the present invention.
Fig. 3 is a circuit diagram of a PWM buffer module disclosed in an embodiment of the present invention.
Fig. 4 is a circuit diagram of a switch driving module disclosed in an embodiment of the present invention.
Fig. 5 is a circuit diagram of a switch module disclosed in an embodiment of the present invention.
Fig. 6 is a circuit diagram of a current feedback module disclosed in an embodiment of the present invention.
Fig. 7 is a circuit diagram of the PWM filter module disclosed in the embodiment of the present invention.
Fig. 8 is a circuit diagram of a protection module disclosed in an embodiment of the present invention.
Fig. 9 is an overall circuit diagram disclosed in an embodiment of the present invention.
Element number description:
1-PWM buffer module; 2-a switch driving module; 3-a switch module; 4-a current feedback module; 5-PWM filtering module; 6-protection module.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
Referring to fig. 2 and 9, the present invention provides a protection circuit of an LED dimming power supply, including: the device comprises a PWM cache module 1, a switch driving module 2, a switch module 3, a current feedback module 4, a PWM filtering module 5 and a protection module 6.
Referring to fig. 3, the PWM buffer module 1 includes a transistor Q5 and a plurality of resistors.
One end of the resistor R7 is connected with an external PWM signal end, the other end of the resistor R7 is respectively connected with one end of the resistor R8 and the base electrode of the triode Q5, and the other end of the resistor R8 is grounded; the collector of the triode Q5 is connected to the positive power VCC, and the emitter is connected to one end of the resistor R9 and the input of the switch driving module 2, respectively. Wherein, the PWM signal is provided by an external singlechip.
Referring to fig. 4, the switch driving module 2 includes a transistor Q6 and a plurality of resistors.
One end of the resistor R10 is connected with the output end of the PWM cache module 1, and the other end of the resistor R10 is respectively connected with the input end of the PWM filtering module 5 and the base electrode of the triode Q6; the collector of the triode Q6 is connected to the positive power VCC, the emitter is connected to one end of the resistor R11 and one end of the resistor R12, the other end of the resistor R11 is grounded, and the other end of the resistor R12 is connected to the control end of the switch module 3.
Referring to fig. 5, the switch module 3 includes a switch Q1.
The gate of the switching tube Q1 is connected to the output terminal of the switch driving module 2, the drain is connected to the negative terminal of the LED light source, and the source is connected to the input terminals of the current feedback module 4 and the protection module 6, respectively.
Referring to fig. 6, the current feedback module 4 includes a resistor R1 and a resistor R2.
The resistor R1 and the resistor R2 are connected in parallel, one common end of the parallel connection is grounded, and the other common end of the parallel connection is connected with one end of the switch module 3 and the input end of the protection module 6 respectively.
Referring to fig. 7, the PWM filter module 5 includes a transistor Q4.
The base electrode of the triode Q4 is connected with the output end of the protection module 6, the collector electrode is connected with the input end of the switch driving module 2, and the emitter electrode is grounded.
Referring to fig. 8, the protection module 6 includes a transistor Q2, a transistor Q3, a capacitor C1, and a plurality of resistors, wherein the transistor Q3 is a PNP transistor. It should be noted that in this embodiment, NPN transistors are used for transistors other than the transistor Q3.
One end of the resistor R3 is connected with the other end of the switch module 3 and the input end of the current feedback module 4, and the other end is connected with the base of the triode Q2, one end of the capacitor C1, one end of the resistor R6 and the output end of the PWM filtering module 5; the other end of the capacitor C6 and the emitter of the triode Q2 are grounded; the collector of the triode Q2 is respectively connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected with a positive power supply VCC, the other end of the resistor R5 is connected with the base of the triode Q3, the emitter of the triode Q3 is connected with the positive power supply VCC, and the collector of the triode Q3 is connected with the other end of the resistor R6.
By adopting the scheme, when the overload or short circuit condition does not occur to the load:
referring to fig. 9, the voltage drop across the resistor R1 and the resistor R2 is small, and at this time, the current fed back to the base of the transistor Q2 through the resistor R3 is substantially zero, the transistor Q2 is turned off, the transistor Q3 is also turned off, the base current of the transistor Q4 is the leakage current of the transistor Q3, and the leakage current is also substantially zero, so that the transistor Q4 is also turned off. Under the above conditions, the protection circuit is not protected, and after the PWM signal from the single chip microcomputer is enhanced and driven by the NPN type composite tube amplifying circuit composed of the transistor Q5 and the transistor Q6, the PWM signal is finally input to the gate of the switching tube Q1 to drive the switching tube Q1, so as to perform PWM dimming on the rear-end LED lamp.
When the condition of artificial short circuit or lamp area overload occurs:
the voltage drop on the resistor R1 and the resistor R2 increases suddenly, at this time, the current fed back to the base of the triode Q2 through the resistor R3 is large, at this time, the triode Q2 is conducted, the triode Q3 is conducted, at this time, the base current of the triode Q4 comes from the current at the two positions of the resistor R3 and the resistor R6, and is also conducted. Under the circumstances, the utility model discloses a protection circuit of LED power of adjusting luminance is effective, and the PWM signal that comes from the singlechip passes through triode Q5 and enlargies the back, is filtered ground by triode Q4 behind resistance R10 department to make triode Q6's base ground connection, triode Q6 ends, finally leads to switch tube Q1 to end, and the LED lamp is in the off-state.
When the power is not cut off, the overload or the short circuit is eliminated:
after the short circuit is eliminated, although the voltage drop at the resistor R1 and the resistor R2 is very low, the transistor Q3 is still in a conducting state, at this time, the base voltages of the transistor Q2 and the transistor Q4 are the divided voltage of the resistor R3 and the resistor R6, and a higher voltage still exists, and the transistor Q2 and the transistor Q4 are still in a conducting state, so that the circuit is still in a continuous protection state.
After the equipment is powered on again, if the short circuit state is eliminated, the normal operation state is recovered, and effective protection for the switching tube Q1 is formed.
To sum up, the utility model discloses a protection circuit and LED lamps and lanterns of LED power of adjusting luminance through hardware circuit, utilizes the PWM signal output of triode auto-lock capability control singlechip, has replaced through singlechip sampling feedback current control PWM signal output function among the prior art. Because the participation of the singlechip is not needed, the time from overload or short circuit to the stop of the switching tube can be effectively shortened, the switching tube can not be burnt, and the switching tube can be effectively protected. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (8)

1. A protection circuit of an LED dimming power supply is characterized by comprising: the device comprises a PWM cache module, a switch driving module, a switch module, a current feedback module, a PWM filtering module and a protection module;
the input end of the PWM cache module is connected with an external PWM signal end, and the output end of the PWM cache module is connected with the input end of the switch driving module;
the output end of the switch driving module is respectively connected with the input end of the PWM filtering module and the control end of the switch module;
one end of the switch module is connected with the negative electrode end of the LED light source, and the other end of the switch module is respectively connected with the input ends of the current feedback module and the protection module;
and the control end of the PWM filtering module is connected with the output end of the protection module.
2. The protection circuit of the LED dimming power supply of claim 1, wherein: the PWM cache module comprises a triode Q5 and a plurality of resistors;
one end of the resistor R7 is connected with an external PWM signal end, the other end of the resistor R7 is respectively connected with one end of the resistor R8 and the base electrode of the triode Q5, and the other end of the resistor R8 is grounded; the collector of the triode Q5 is connected with the positive power supply VCC, and the emitter is respectively connected with one end of the resistor R9 and the input end of the switch driving module.
3. The protection circuit of the LED dimming power supply of claim 1, wherein: the switch driving module comprises a triode Q6 and a plurality of resistors;
one end of the resistor R10 is connected with the output end of the PWM cache module, and the other end of the resistor R10 is respectively connected with the input end of the PWM filtering module and the base electrode of the triode Q6; the collector of triode Q6 connects positive power VCC, and the projecting pole is connected with resistance R11, the one end of resistance R12 respectively, and the other end ground connection of resistance R11, the other end of resistance R12 with switch module's control end is connected.
4. The protection circuit of the LED dimming power supply of claim 1, wherein: the switch module comprises a switch tube Q1; the grid electrode of the switching tube Q1 is connected with the output end of the switch driving module, the drain electrode is connected with the negative electrode end of the LED light source, and the source electrode is respectively connected with the input ends of the current feedback module and the protection module.
5. The protection circuit of the LED dimming power supply of claim 1, wherein: the current feedback module comprises a resistor R1 and a resistor R2;
the resistor R1 and the resistor R2 are connected in parallel, one common end of the parallel connection is grounded, and the other common end of the parallel connection is connected with one end of the switch module and the input end of the protection module respectively.
6. The protection circuit of the LED dimming power supply of claim 1, wherein: the PWM filtering module comprises a triode Q4; the base electrode of the triode Q4 is connected with the output end of the protection module, the collector electrode of the triode Q4 is connected with the input end of the switch driving module, and the emitting electrode of the triode Q4 is grounded.
7. The protection circuit of the LED dimming power supply of claim 1, wherein: the protection module comprises a triode Q2, a triode Q3, a capacitor C1 and a plurality of resistors, wherein the triode Q3 is a PNP type triode;
one end of the resistor R3 is respectively connected with the other end of the switch module and the input end of the current feedback module, and the other end of the resistor R3 is respectively connected with the base of the triode Q2, one end of the capacitor C1, one end of the resistor R6 and the output end of the PWM filtering module; the other end of the capacitor C6 and the emitter of the triode Q2 are grounded; the collector of the triode Q2 is respectively connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected with a positive power supply VCC, the other end of the resistor R5 is connected with the base of the triode Q3, the emitter of the triode Q3 is connected with the positive power supply VCC, and the collector of the triode Q3 is connected with the other end of the resistor R6.
8. An LED lamp, characterized in that: the LED lamp comprises an LED lamp and a protection circuit of an LED dimming power supply, wherein the input end of the protection circuit of the LED dimming power supply is connected with an external PWM signal end, and the output end of the protection circuit of the LED dimming power supply is connected with the negative electrode of the LED lamp, and the protection circuit of the LED dimming power supply is the protection circuit of the LED dimming power supply as claimed in any one of claims 1 to 7.
CN202023065447.7U 2020-12-17 2020-12-17 Protection circuit of LED dimming power supply and LED lamp Expired - Fee Related CN214101866U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202023065447.7U CN214101866U (en) 2020-12-17 2020-12-17 Protection circuit of LED dimming power supply and LED lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202023065447.7U CN214101866U (en) 2020-12-17 2020-12-17 Protection circuit of LED dimming power supply and LED lamp

Publications (1)

Publication Number Publication Date
CN214101866U true CN214101866U (en) 2021-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202023065447.7U Expired - Fee Related CN214101866U (en) 2020-12-17 2020-12-17 Protection circuit of LED dimming power supply and LED lamp

Country Status (1)

Country Link
CN (1) CN214101866U (en)

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Granted publication date: 20210831