CN205546052U - PWM LED constant voltage drive power supply that adjusts luminance - Google Patents
PWM LED constant voltage drive power supply that adjusts luminance Download PDFInfo
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- CN205546052U CN205546052U CN201620090869.4U CN201620090869U CN205546052U CN 205546052 U CN205546052 U CN 205546052U CN 201620090869 U CN201620090869 U CN 201620090869U CN 205546052 U CN205546052 U CN 205546052U
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- circuit
- filter circuit
- pwm
- power supply
- drive power
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Abstract
The utility model discloses a PWM LED constant voltage drive power supply that adjusts luminance, including constant voltage drive power supply, inside EMCEMI filter circuit, rectification filter circuit, pi type filter circuit, active PFC circuit, DCDC reduction voltage circuit and the output filter circuit who links to each other in order that be equipped with of constant voltage drive power supply, constant voltage drive power supply still is equipped with one and links to each other with output filter circuit and be used for adjusting the PWM dimmer circuit of LED load luminance. The utility model discloses at the inside PWM dimmer circuit that has set up of ordinary LED constant voltage drive power supply, only need provide simple PWM signal outside can adjust luminance to the LED load of output, can extensively be used for advertisement word, advertising light boxes's adjustting of the lighteness for the luminance of adjusting the LED load becomes very convenient, is favorable to the energy saving moreover.
Description
Technical field
The utility model relates to LED and shows field, particularly relates to a kind of PWM dimming LED (Light Emitting Diode) constant-voltage driving power source.
Background technology
LED drive power is that power supply supply is converted to specific voltage x current to drive LED luminous, thus obtains intended brightness requirement, and ensures the uniformity of each LED luminance, colourity.Under normal circumstances: the input of LED drive power includes high pressure industrial frequency AC (i.e. civil power), low-voltage direct, HVDC, low-voltage high-frequency exchange (such as the output of electronic transformer) etc..The output of LED drive power then great majority are for changing the constant current source of voltage with the change of LED forward drop value.
Light adjusting circuit is not the most carried, as the power of LED load being adjusted being necessary for adding extra light adjusting controller, it is impossible to accomplish to use flexibly inside the LED constant-voltage driving power source used on current market.
Utility model content
In order to solve prior art is all not provided with inside LED constant-voltage driving power source light adjusting circuit, the problem that LED load brightness cannot be adjusted flexibly, the utility model provides a kind of PWM dimming LED (Light Emitting Diode) constant-voltage driving power source, including constant-voltage driving power source, being provided with EMC/EMI filter circuit, current rectifying and wave filtering circuit, π type filter circuit, active PFC circuit, DC/DC reduction voltage circuit and the output filter circuit being sequentially connected inside constant-voltage driving power source, described constant-voltage driving power source is additionally provided with one and is connected with output filter circuit the PWM light adjusting circuit for regulating LED load brightness.
Further, described PWM light adjusting circuit includes: the field-effect transistor multiple parallel with one another connected with LED load, the Jun Heng diode accelerating electric discharge and the resistance with diodes in parallel, and multiple triode being connected to adjustment field-effect transistor gate source voltage with central processing module is played with field-effect transistor series connection.
The utility model is provided with PWM light adjusting circuit inside common LED constant-voltage driving power source, simple pwm signal only need to be provided outside can the LED load of output to be dimmed, can be widely used for the brightness regulation of advertisement character, advertising lamp box, make the brightness regulating LED load become very convenient, and be conducive to saving the energy.
Accompanying drawing explanation
Fig. 1 is the block diagram of the utility model structure；
Fig. 2 is circuit diagram of the present utility model.
Detailed description of the invention
With specific embodiment, the utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, the PWM dimming LED (Light Emitting Diode) constant-voltage driving power source that the utility model provides is provided with EMC/EMI filter circuit, current rectifying and wave filtering circuit, π type filter circuit, active PFC circuit, DC/DC reduction voltage circuit and the output filter circuit being sequentially connected inside common constant-voltage driving power source, a PWM light adjusting circuit being connected with output filter circuit it is additionally provided with inside constant-voltage driving power source, PWM light adjusting circuit connects LED load, for adjusting the brightness of LED load.
As shown in Figure 2, PWM light adjusting circuit includes: 4 parallel with one another field-effect transistor Q1, Q2, Q3, Q4s luminous with LED load tandem drive LED load, play with field-effect transistor Q1, Q2, Q3, Q4 series connection respectively the Jun Heng diode D1 accelerating electric discharge and with resistance R5, the diode D2 of diodes in parallel and with resistance R6, the diode D3 of diodes in parallel and with resistance R7, the diode D4 of diodes in parallel and with the resistance R8 of diodes in parallel, and be used for adjusting triode Q5, Q6, Q7 of field-effect transistor gate source voltage.
Pwm signal transmits to NPN type triode Q6, when pwm signal is high level, triode Q6 turns on, colelctor electrode one resistance R9 of pull-up of triode Q6, therefore the voltage VCE=0V between triode Q6 collector and emitter, the voltage VBE < 0V between base stage and the emitter stage of PNP type triode Q7, therefore the conducting of PNP type triode Q7, the now VGS(gate source voltage of FET Q1, Q2, Q3, Q4) it is 0V, 4 metal-oxide-semiconductor switches cut out, and the effect of 4 metal-oxide-semiconductor parallel connections is to increase output electric current；When pwm signal is low level, the VBE of triode Q6 is not turned on less than 0.6V, triode Q6, now NPN type triode Q5 conducting, PNP type triode Q7 is not turned on, and voltage flows to resistance R11 through triode Q5, simultaneously driving 4 metal-oxide-semiconductors again, 4 metal-oxide-semiconductors open switch simultaneously.The regulation that PWM light adjusting circuit realizes LED average current by wave chopping technology controls, persistence characteristic according to human eye, can be the regulating frequency that human eye cannot be perceived the frequency setting of PWM light modulation, by changing PWM duty cycle, realize the light modulation output of LED load, thus realize LED load brightness control function.
Know-why of the present utility model is described above in association with specific embodiment.These descriptions are intended merely to explain principle of the present utility model, and can not be construed to the restriction to the utility model protection domain by any way.Based on explanation herein, those skilled in the art need not pay performing creative labour can associate other detailed description of the invention of the present utility model, within these modes fall within protection domain of the present utility model.
Claims (2)
1. a PWM dimming LED (Light Emitting Diode) constant-voltage driving power source, including constant-voltage driving power source, EMC/EMI filter circuit, current rectifying and wave filtering circuit, π type filter circuit, active PFC circuit, DC/DC reduction voltage circuit and the output filter circuit being sequentially connected it is provided with inside constant-voltage driving power source, it is characterized in that, described constant-voltage driving power source is additionally provided with one and is connected with output filter circuit the PWM light adjusting circuit for regulating LED load brightness.
2. PWM dimming LED (Light Emitting Diode) constant-voltage driving power source as claimed in claim 1, it is characterized in that, described PWM light adjusting circuit includes: the field-effect transistor multiple parallel with one another connected with LED load, the Jun Heng diode accelerating electric discharge and the resistance with diodes in parallel, and multiple triode being connected to adjustment field-effect transistor gate source voltage with central processing module is played with field-effect transistor series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620090869.4U CN205546052U (en) | 2016-01-29 | 2016-01-29 | PWM LED constant voltage drive power supply that adjusts luminance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620090869.4U CN205546052U (en) | 2016-01-29 | 2016-01-29 | PWM LED constant voltage drive power supply that adjusts luminance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205546052U true CN205546052U (en) | 2016-08-31 |
Family
ID=56772085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620090869.4U Expired - Fee Related CN205546052U (en) | 2016-01-29 | 2016-01-29 | PWM LED constant voltage drive power supply that adjusts luminance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205546052U (en) |
-
2016
- 2016-01-29 CN CN201620090869.4U patent/CN205546052U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20210129 |