10wled驱动电路
时间: 2023-11-01 16:07:46 浏览: 108
LED驱动电路是用来控制和供电LED灯的电路。10W LED驱动电路的设计主要考虑到以下几个方面:
1. 电源选型:LED驱动电路需要提供稳定的直流电源供电LED灯。根据10W的功率需求,需要选择适当的电源模块或者设计一个稳压电源来提供所需的电压和电流。
2. 电流控制:LED的亮度和寿命与其驱动电流密切相关,因此驱动电路需要能够控制输出的电流。一种常见的方式是使用恒流驱动器来保持恒定的电流输出。
3. 温度保护:LED对温度敏感,过高的温度可能会损坏LED灯。因此,驱动电路通常需要具备温度保护功能,当温度过高时能够自动降低输出电流或者关闭输出。
4. 过载保护:驱动电路还应具备过载保护功能,以防止过大的电流或短路情况对LED灯造成损坏。
5. 尺寸和散热:考虑到10W的功率,驱动电路需要合理设计尺寸和散热措施,以确保在工作时能够有效散热并保持正常工作温度。
请注意,以上只是一般的设计考虑因素,具体的10W LED驱动电路设计需要根据实际需求和条件来进行。
相关问题
WLED用荧光粉的性能有几个方面的要求
WLED(白光发光二极管)使用荧光粉需要满足以下几个方面的要求:
1. 高光效:荧光粉的发光效率要尽可能高,以提高WLED的整体光效。
2. 良好的色彩还原性:荧光粉的发光波长和发光强度要稳定,以确保WLED的色彩还原性良好。
3. 宽波长转换:荧光粉的激发波长范围要尽可能宽,以便于激发不同波长的LED芯片。
4. 耐热性:荧光粉需要具备一定的耐热性能,以避免在高温环境下发生光衰现象。
5. 长期稳定性:荧光粉需要具备长期稳定的发光性能,以确保WLED的长期稳定性和寿命。
int dsi_panel_set_backlight(struct dsi_panel panel, u32 bl_lvl) { int rc = 0; struct dsi_backlight_config bl = &panel->bl_config; if (panel->host_config.ext_bridge_mode) return 0; DSI_DEBUG("backlight type:%d lvl:%d\n", bl->type, bl_lvl); switch (bl->type) { case DSI_BACKLIGHT_WLED: rc = backlight_device_set_brightness(bl->raw_bd, bl_lvl); break; case DSI_BACKLIGHT_DCS: rc = dsi_panel_update_backlight(panel, bl_lvl); break; case DSI_BACKLIGHT_EXTERNAL: rc = lcd_bl_set_led_brightness(bl_lvl); //pr_err("dsi set bias brightness: %d\n", bl_lvl); rc = lcd_bias_set_led_brightness(bl_lvl); //pr_err("dsi set brightness: %d\n", bl_lvl); break; case DSI_BACKLIGHT_PWM: rc = dsi_panel_update_pwm_backlight(panel, bl_lvl); break; default: DSI_ERR("Backlight type(%d) not supported\n", bl->type); rc = -ENOTSUPP; } return rc; } int lcd_bl_set_led_brightness(int value)//for set bringhtness { dev_warn(&lcd_bl_i2c_client->dev, "lcm 8866 bl = %d\n", value); if (value < 0) { dev_warn(&lcd_bl_i2c_client->dev, "value=%d\n", value); return 0; } if (value > 0) { lcd_bl_write_byte(KTZ8866_DISP_BB_LSB, value & 0x07);// lsb lcd_bl_write_byte(KTZ8866_DISP_BB_MSB, (value >> 3) & 0xFF);// msb lcd_bl_write_byte(KTZ8866_DISP_BL_ENABLE, 0x4F); / BL enabled and Current sink 1/2/3/4 enabled;/ } else { lcd_bl_write_byte(KTZ8866_DISP_BB_LSB, 0x00);// lsb lcd_bl_write_byte(KTZ8866_DISP_BB_MSB, 0x00);// msb lcd_bl_write_byte(KTZ8866_DISP_BL_ENABLE, 0x00); /* BL enabled and Current sink 1/2/3/4 disabled;/ } return 0; } int lcd_bias_set_led_brightness(int value)//for set bringhtness { dev_warn(&lcd_bl_bias_i2c_client->dev, "lcm 8866 bl = %d\n", value); if (value < 0) { dev_warn(&lcd_bl_bias_i2c_client->dev, "invalid value=%d\n", value); return 0; } if (value > 0) { lcd_bl_bias_write_byte(KTZ8866_DISP_BB_LSB, value & 0x07);// lsb lcd_bl_bias_write_byte(KTZ8866_DISP_BB_MSB, (value >> 3) & 0xFF);// msb lcd_bl_bias_write_byte(KTZ8866_DISP_BL_ENABLE, 0x4F); / BL enabled and Current sink 1/2/3/4 enabled;/ } else { lcd_bl_bias_write_byte(KTZ8866_DISP_BB_LSB, 0x00);// lsb lcd_bl_bias_write_byte(KTZ8866_DISP_BB_MSB, 0x00);// msb lcd_bl_bias_write_byte(KTZ8866_DISP_BL_ENABLE, 0x00); / BL enabled and Current sink 1/2/3/4 disabled;*/ } return 0; } dsi_panel_set_backlight、lcd_bl_set_led_brightness和lcd_bias_set_led_brightness源码如上,帮忙用工作队列的方式,同时实现在case DSI_BACKLIGHT_EXTERNAL:下并发执行lcd_bl_set_led_brightness和lcd_bias_set_led_brightness两个函数
好的,我可以为您提供一个使用工作队列来实现并发执行`lcd_bl_set_led_brightness`和`lcd_bias_set_led_brightness`的示例代码。具体实现方法如下:
1. 定义一个工作结构体`struct work_struct`,并在其中传递参数。
```
struct backlight_work {
struct work_struct work;
struct i2c_client *lcd_bl_i2c_client;
struct i2c_client *lcd_bl_bias_i2c_client;
int value;
};
```
2. 定义工作队列。
```
static struct workqueue_struct *bl_workqueue;
```
3. 在`dsi_panel_set_backlight`函数中,将`lcd_bl_set_led_brightness`和`lcd_bias_set_led_brightness`函数的调用封装成一个工作任务,并将任务推入工作队列。
```
case DSI_BACKLIGHT_EXTERNAL:
{
struct backlight_work *bl_work;
bl_work = kzalloc(sizeof(*bl_work), GFP_KERNEL);
if (!bl_work)
return -ENOMEM;
INIT_WORK(&bl_work->work, backlight_worker);
bl_work->lcd_bl_i2c_client = lcd_bl_i2c_client;
bl_work->lcd_bl_bias_i2c_client = lcd_bl_bias_i2c_client;
bl_work->value = bl_lvl;
queue_work(bl_workqueue, &bl_work->work);
break;
}
```
4. 在`backlight_worker`函数中,实现`lcd_bl_set_led_brightness`和`lcd_bias_set_led_brightness`函数的并发执行。
```
static void backlight_worker(struct work_struct *work)
{
struct backlight_work *bl_work = container_of(work, struct backlight_work, work);
int value = bl_work->value;
if (value < 0) {
dev_warn(&bl_work->lcd_bl_i2c_client->dev, "invalid value=%d\n", value);
} else if (value > 0) {
lcd_bl_write_byte(KTZ8866_DISP_BB_LSB, value & 0x07);
lcd_bl_write_byte(KTZ8866_DISP_BB_MSB, (value >> 3) & 0xFF);
lcd_bl_write_byte(KTZ8866_DISP_BL_ENABLE, 0x4F);
lcd_bl_bias_write_byte(KTZ8866_DISP_BB_LSB, value & 0x07);
lcd_bl_bias_write_byte(KTZ8866_DISP_BB_MSB, (value >> 3) & 0xFF);
lcd_bl_bias_write_byte(KTZ8866_DISP_BL_ENABLE, 0x4F);
} else {
lcd_bl_write_byte(KTZ8866_DISP_BB_LSB, 0x00);
lcd_bl_write_byte(KTZ8866_DISP_BB_MSB, 0x00);
lcd_bl_write_byte(KTZ8866_DISP_BL_ENABLE, 0x00);
lcd_bl_bias_write_byte(KTZ8866_DISP_BB_LSB, 0x00);
lcd_bl_bias_write_byte(KTZ8866_DISP_BB_MSB, 0x00);
lcd_bl_bias_write_byte(KTZ8866_DISP_BL_ENABLE, 0x00);
}
kfree(bl_work);
}
```
这样,当`dsi_panel_set_backlight`函数中调用`lcd_bl_set_led_brightness`和`lcd_bias_set_led_brightness`时,会将其封装成一个工作任务并推入工作队列中,`backlight_worker`函数实现这两个函数的并发执行。