CN219918712U - PWM voltage conversion circuit in high-power lighting lamp - Google Patents
PWM voltage conversion circuit in high-power lighting lamp Download PDFInfo
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- CN219918712U CN219918712U CN202321312420.4U CN202321312420U CN219918712U CN 219918712 U CN219918712 U CN 219918712U CN 202321312420 U CN202321312420 U CN 202321312420U CN 219918712 U CN219918712 U CN 219918712U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 31
- 230000001052 transient effect Effects 0.000 claims description 23
- 238000005286 illumination Methods 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses a PWM voltage conversion circuit in a high-power lighting lamp, which comprises a first wiring terminal SP3 and a second wiring terminal SP2, and is characterized in that: the first wiring terminal SP3 is electrically connected with the second wiring terminal SP2 through the PWM voltage conversion circuit, the PWM voltage conversion circuit comprises a protection circuit and an optocoupler circuit, the first wiring terminal SP3 is electrically connected with the protection circuit, the optocoupler circuit comprises a photoelectric coupler U1, the protection circuit is electrically connected with a transmitting unit of the photoelectric coupler U1, a receiving unit of the photoelectric coupler U1 is electrically connected with the second wiring terminal SP2, a diode D2 which is reversely connected with the transmitting unit of the photoelectric coupler U1 in parallel is used for preventing an input signal from being connected reversely, and a light emitting diode in the optocoupler is damaged, so that protection can be provided for the photoelectric coupler U1 in the PWM voltage conversion circuit, the service life is prolonged, and the damage rate of an illuminating lamp is reduced.
Description
Technical Field
The utility model relates to the technical field of high-power lighting lamps, in particular to a PWM voltage conversion circuit in a high-power lighting lamp.
Background
The high-power lighting lamp is a lighting device for lighting indoor or outdoor places and generally has the characteristics of high brightness, high color temperature, long service life and the like. The main application fields of the lamp comprise road illumination, square illumination, factory workshop illumination and the like.
Through searching, in the prior art, chinese patent application number: CN202021636420.6 discloses a workshop brightness self-adaptive explosion-proof lighting lamp control circuit, which comprises a singlechip, a crystal oscillator module, an illuminance sensor, a resetting module, a display module, a program downloading module, a voltage conversion module, a key input module, an I/O control module, a PWM module, a relay module and a mode conversion module; the singlechip is connected with the crystal oscillator module, the illuminance sensor, the reset module, the display module, the program downloading module, the voltage conversion module, the key input module, the I/O control module, the PWM module, the relay module and the mode conversion module; the I/O control module is connected with the PWM module, and the relay module is connected with the PWM module and the switching power supply. So that the illumination brightness can be automatically adjusted according to the ambient brightness.
The device still has the following drawbacks:
however, although the existing PWM voltage conversion circuit for a high-power lighting lamp can be used for controlling the brightness of the lighting lamp by converting an input PWM signal into a corresponding analog voltage output, the PWM voltage conversion circuit is not optimized, so that the PWM voltage conversion circuit cannot well protect the photo coupler U1 when in use, the photo coupler is easily damaged in the use process, and the lighting brightness cannot be automatically adjusted.
Disclosure of Invention
The utility model aims to provide a PWM voltage conversion circuit in a high-power lighting lamp so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides a PWM voltage conversion circuit in high-power light, includes first binding post SP3 and second binding post SP2, first binding post SP3 passes through PWM voltage conversion circuit and second binding post SP2 electric connection, PWM voltage conversion circuit includes protection circuit and opto-coupler circuit, first binding post SP3 and protection circuit electric connection, opto-coupler circuit includes photoelectric coupler U1, protection circuit and photoelectric coupler U1's transmitting unit electric connection, photoelectric coupler U1's receiving unit and second binding post SP2 electric connection.
Preferably, the pin 2 of the first connecting terminal SP3 is connected to one end of the fuse F1, and the other end of the fuse F1 is connected to one end of the diode D4.
Preferably, the protection circuit includes a transient diode TVS1 and an adjustable resistor R2, two ends of the transient diode TVS1 and the adjustable resistor R2 are connected in parallel, one ends of the transient diode TVS1 and the adjustable resistor R2 are connected with the other end of the diode D4, and the other ends of the transient diode TVS1 and the adjustable resistor R2 are connected with the 1 pin of the first connection terminal SP 3.
Preferably, the protection circuit further includes a resistor R1, a diode D2, and a diode D3, one ends of the transient diode TVS1 and the adjustable resistor R2 are connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the diode D2, the transmitting unit of the photo coupler U1 is connected in parallel with two ends of the diode D2, the other end of the diode D2 is connected with one end of the diode D3, and the other end of the diode D3 and the 1 pin of the first wiring terminal SP3 are grounded.
Preferably, the receiving unit of the photo coupler U1 is further connected in parallel with a diode D1, and two ends of the diode D1 are respectively connected with pins 1 and 2 of the second connection terminal SP 2.
Preferably, the photoelectric coupler U1 is of the type TLP 521-1.
Compared with the prior art, the utility model has the beneficial effects that:
by adding a protection circuit to the transmitting unit of the photoelectric coupler U1, the parallel connection of the transient diode and the adjustable resistor is used for providing overvoltage protection for the circuit. When overvoltage occurs in the circuit, the transient diode is rapidly conducted, redundant voltage is led to the ground, and other elements in the circuit are protected from damage. The adjustable resistor is used for adjusting the working voltage of the transient diode so as to ensure that the transient diode works in the normal working range of the circuit, and meanwhile, the diode D2 which is reversely connected in parallel with the transmitting unit of the photoelectric coupler U1 is used for preventing the input signal from being connected reversely and damaging the light-emitting diode in the photoelectric coupler, so that the protection can be provided for the photoelectric coupler U1 in the PWM voltage conversion circuit, the service life is prolonged, and the damage rate of the lighting lamp is further reduced.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
Fig. 1 is a circuit diagram of a PWM voltage conversion circuit of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, an embodiment of the present utility model is provided:
the utility model provides a PWM voltage conversion circuit in high-power light, including first binding post SP3 and second binding post SP2, first binding post SP3 passes through PWM voltage conversion circuit and second binding post SP2 electric connection, PWM voltage conversion circuit includes protection circuit and opto-coupler circuit, first binding post SP3 and protection circuit electric connection, opto-coupler circuit includes photo coupler U1, protection circuit and photo coupler U1's transmitting unit electric connection, photo coupler U1's receiving element and second binding post SP2 electric connection, photo coupler U1 adopts TLP521-1 model, photo coupler U1's transmitting unit adopts emitting diode, emitting diode can periodically switch on, cut off, the output uses the grafting method of similar coinjection stage of triode, from the collecting electrode output, it is similar to common emitter triode circuit, the output of opto-coupler can also reverse.
For example, when a high level is input, the diode emits light, and pins 3 and 4 of the optocoupler are conducted, then current flows through R2, if the optocoupler reaches a saturated state, the voltage drop on R2 approaches the voltage of the output end, and the voltage between 3 and 4 is very low, namely a low level is output; when the input low level is low, the diode is cut off and does not emit light, 3 and 4 are not conducted, and the voltage of the output end is pulled to be close to the power supply, namely the output high level is output.
The pin 2 of the first terminal SP3 is connected to one end of the fuse F1, and the other end of the fuse F1 is connected to one end of the diode D4, and when an excessive current occurs in the circuit, the circuit is rapidly cut off to protect other elements in the circuit from damage. The working principle of the fuse F1 is: when the current in the circuit exceeds the rated current of the fuse F1, the fuse in the fuse F1 is heated to melt, and then the circuit is opened. This prevents damage to other components caused by excessive currents in the circuit.
The protection circuit comprises a transient diode TVS1 and an adjustable resistor R2, wherein two ends of the transient diode TVS1 and the adjustable resistor R2 are connected in parallel, one end of the transient diode TVS1 and one end of the adjustable resistor R2 are connected with the other end of a diode D4, and the other end of the transient diode TVS1 and the other end of the adjustable resistor R2 are connected with a 1 pin of a first wiring terminal SP 3.
The effect of the parallel connection of the transient diode and the adjustable resistor is to provide overvoltage protection of the circuit. When overvoltage occurs in the circuit, the transient diode is rapidly conducted, redundant voltage is led to the ground, and other elements in the circuit are protected from damage. The adjustable resistor is used for adjusting the working voltage of the transient diode so as to ensure that the transient diode works in the normal working range of the circuit.
The protection circuit further comprises a resistor R1, a diode D2 and a diode D3, one ends of the transient diode TVS1 and the adjustable resistor R2 are connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the diode D2, the transmitting unit of the photoelectric coupler U1 is connected with two ends of the diode D2 in parallel, the other end of the diode D2 is connected with one end of the diode D3, the other end of the diode D3 and the 1 pin of the first wiring terminal SP3 are grounded, the receiving unit of the photoelectric coupler U1 is connected with the diode D1 in parallel, and two ends of the diode D1 are connected with the 1 pin and the 2 pin of the second wiring terminal SP2 respectively.
The anti-parallel diode D2 is used to prevent the input signal from being connected reversely, and damage the light emitting diode inside the optocoupler (the input reverse withstand voltage of the general optocoupler is 5V), after the input of the diode D2, if the reverse voltage is input, the diode will limit the reverse voltage within 1V, and the diode D3 is similar.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a PWM voltage conversion circuit in high-power light, includes first binding post SP3 and second binding post SP2, its characterized in that: the first wiring terminal SP3 is electrically connected with the second wiring terminal SP2 through a PWM voltage conversion circuit, the PWM voltage conversion circuit comprises a protection circuit and an optocoupler circuit, the first wiring terminal SP3 is electrically connected with the protection circuit, the optocoupler circuit comprises a photoelectric coupler U1, the protection circuit is electrically connected with a transmitting unit of the photoelectric coupler U1, and a receiving unit of the photoelectric coupler U1 is electrically connected with the second wiring terminal SP 2.
2. The PWM voltage conversion circuit for a high power lamp of claim 1, wherein: the pin 2 of the first connecting terminal SP3 is connected to one end of the fuse F1, and the other end of the fuse F1 is connected to one end of the diode D4.
3. The PWM voltage conversion circuit for a high-power illumination lamp according to claim 2, wherein: the protection circuit comprises a transient diode TVS1 and an adjustable resistor R2, wherein two ends of the transient diode TVS1 and the adjustable resistor R2 are connected in parallel, one end of the transient diode TVS1 and one end of the adjustable resistor R2 are connected with the other end of a diode D4, and the other ends of the transient diode TVS1 and the adjustable resistor R2 are connected with a 1 pin of a first wiring terminal SP 3.
4. A PWM voltage conversion circuit for a high power lamp according to claim 3, wherein: the protection circuit further comprises a resistor R1, a diode D2 and a diode D3, one ends of the transient diode TVS1 and the adjustable resistor R2 are connected with one end of the resistor R1, the other end of the resistor R1 is connected with one end of the diode D2, the transmitting unit of the photoelectric coupler U1 is connected with two ends of the diode D2 in parallel, the other end of the diode D2 is connected with one end of the diode D3, and the other end of the diode D3 and the 1 pin of the first wiring terminal SP3 are grounded.
5. The PWM voltage conversion circuit for a high power lamp of claim 1, wherein: the receiving unit of the photoelectric coupler U1 is also connected with a diode D1 in parallel, and two ends of the diode D1 are respectively connected with pins 1 and 2 of the second connecting terminal SP 2.
6. The PWM voltage conversion circuit for a high power lamp of claim 1, wherein: the photoelectric coupler U1 adopts a model TLP 521-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321312420.4U CN219918712U (en) | 2023-05-29 | 2023-05-29 | PWM voltage conversion circuit in high-power lighting lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321312420.4U CN219918712U (en) | 2023-05-29 | 2023-05-29 | PWM voltage conversion circuit in high-power lighting lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219918712U true CN219918712U (en) | 2023-10-27 |
Family
ID=88436799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321312420.4U Active CN219918712U (en) | 2023-05-29 | 2023-05-29 | PWM voltage conversion circuit in high-power lighting lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219918712U (en) |
-
2023
- 2023-05-29 CN CN202321312420.4U patent/CN219918712U/en active Active
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