PWM driven LED light therapy device

A technology of LED light source and equipment, which is applied in the cross field of medical treatment and lighting technology, to achieve the effect of easy control and adjustment

Pending Publication Date: 2017-01-18
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the well-known heat dissipation problems of LEDs, when the optical power density is higher than the lower limit under conventional constant current drive, the surface temperature of the phototherapy equipment often easily exceeds the safe upper limit temperature stipulated by the relevant national regulations.

Method used

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  • PWM driven LED light therapy device
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  • PWM driven LED light therapy device

Examples

Experimental program
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Embodiment 1

[0020] figure 1 It is a waveform schematic diagram of the PWM pulse driving mode of the light source assembly described in the present invention. Experiments have proved that due to the limitation of LED heat dissipation technology, the temperature rise of LEDs driven by constant current is serious, resulting in the surface temperature of the treatment equipment far exceeding the safety upper limit temperature stipulated by relevant national regulations under a certain output light power density. This problem can be effectively solved by using PWM pulse drive. According to needs, the pulse cycle frequency can be set higher than the fusion frequency of human eyes, so that the patient has the same perception of the output light under the two driving modes. Under this current pulse signal, the peak optical power density of the device is equal to (not lower than) the average optical power density output value under the constant current driving mode, so as to ensure the same (or e...

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Abstract

The invention belongs to the intersection field of medical treatment and lighting technology, in particular to a PWM driven LED light therapy device. The device uses an advanced pulse drive control mode and an innovative non-planar thermal silica gel to make the optical power density outputted from the device higher than an effective therapeutic threshold, but the surface temperature lower than the upper limit of relevant national safety regulations. Compared with the current laser and intense pulsed light medical technology, the device can meet the same effect, while the treatment process is safer and more comfortable, enabling the device with potential for flexible skin-light therapy and to be in line with the future development trend of wearable medical devices.

Description

technical field [0001] The invention belongs to the intersecting field of medical treatment and lighting technology, and in particular relates to an LED phototherapy device driven by PWM. Background technique [0002] In the medical field, using light to improve disease conditions is a very common treatment method. At present, laser technology and intense light pulse technology are widely used. The basic principle is: the skin surface or subcutaneous abnormal tissue absorbs the incident light strongly and the temperature rises locally in a short time, so that the cells are destroyed or gasified. Although such schemes have obvious immediate curative effects, they are invasive or destructive treatments, which will cause certain side effects on normal physiological tissues of the human body. In addition, irradiated patients often feel a certain burning sensation, which creates anxiety and fear that are not conducive to treatment. [0003] However, more and more studies have s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/06
CPCA61N5/0613A61N5/0616A61N5/062A61N5/0625A61N2005/0664A61N2005/0658A61N2005/0651A61N2005/0645A61N2005/0632
Inventor 刘木清陈天然李默楠胡晓剑
Owner FUDAN UNIV
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