Strong pulsed light emitting self-protection circuit and strong pulsed light therapeutic apparatus

Abstract

The utility model discloses an intense pulsed light emitting self-protection circuit and an intense pulsed light therapeutic apparatus, the self-protection circuit comprises an optical coupler, the input end of the optical coupler receives an intense pulsed light PWM control signal, the optical coupler converts the intense pulsed light PWM control signal into an intense pulsed light emitting signal and outputs the intense pulsed light emitting signal, and the output end of the optical coupler outputs the intense pulsed light emitting signal. And a controlled switch is connected between the optical coupler and the input end power supply, the control end of the controlled switch receives a heartbeat PWM signal, the heartbeat PWM signal maintains the conduction of the controlled switch, and the controlled switch is disconnected when the heartbeat PWM signal disappears. According to the utility model, the strong pulse light is prevented from emitting for a long time through the controlled switch under the condition that the light emitting control program is abnormal.

Description

Technical Field

[0001] The utility model relates to the technical field of intense pulse light therapeutic apparatus, in particular to an intense pulse light self-protection circuit and an intense pulse light therapeutic apparatus. Background Art

[0002] Intense pulsed light, also known as photons, is a polychromatic pulsed light source released by a high-energy xenon lamp under tens of thousands of volts of high voltage. Intense pulsed light is mainly used to treat skin aging, and is also widely used to treat various pigmented skin diseases, vascular skin diseases, hirsutism and even inflammatory skin diseases (such as acne and rosacea). At present, many manufacturers have launched some intense pulsed light therapy devices on the market to treat related skin problems. The use process of the intense pulsed light therapy device is as follows: the light head of the intense pulsed light therapy device is close to the skin, and the light waves of a certain intensity are output at a preset time interval. During this process, the light head of the intense pulsed light therapy device can be operated to move around the skin so that the light waves act on the skin to be treated to achieve treatment. The light waves output by the intense pulsed light therapy device have a high intensity, and the treatment effect can be achieved by acting on the affected part of the skin for a short time. If the light is emitted for a long time, it will cause damage to the user's skin. To this end, the intense pulsed light therapy device controls the light emission time through the light emission control program of its MCU, so that the light waves are output at a preset time interval to prevent long-term light from causing damage to the user's skin. The light control program of the MCU of the intense pulsed light therapy device may have abnormalities such as running away or freezing, which will cause abnormal light control and may cause long-term light emission, causing damage to the user's skin. Summary of the invention

[0003] The technical problem to be solved by the utility model is how to prevent the intense pulse light from emitting light for a long time when an abnormality occurs in the light emitting control program.

[0004] In order to solve the above technical problems, the utility model provides an intense pulse light self-protection circuit, including an optical coupler, an input end of the optical coupler receives an intense pulse light PWM control signal, the optical coupler converts the intense pulse light PWM control signal into an intense pulse light output signal output, a controlled switch is connected between the optical coupler and the input power supply, the control end of the controlled switch receives a heartbeat PWM signal, the heartbeat PWM signal maintains the controlled switch on, and the controlled switch is disconnected when the heartbeat PWM signal disappears.

[0005] Furthermore, the control end of the controlled switch is connected to a DC isolation circuit, and the heartbeat PWM signal is received via the DC isolation circuit.

[0006] Furthermore, the DC blocking circuit includes a capacitor C7 and a rectifier diode D7 connected in series in sequence, and the junction between the capacitor C7 and the anode of the rectifier diode D7 is grounded through a clamping diode D10. The DC blocking circuit also includes a transistor Q17, and the base of the transistor Q17 is connected to the cathode of the rectifier diode D7, the emitter is grounded, and the collector is connected to the control end of the controlled switch.

[0007] Furthermore, the DC isolation circuit is connected with a current limiting resistor R44 between the rectifier diode D7 and the transistor Q17.

[0008] Furthermore, the DC blocking circuit is grounded at the junction of the rectifier diode D7 and the resistor R44 via the filter capacitor C83.

[0009] Furthermore, a current limiting resistor R43 is connected between the collector of the transistor Q17 and the control terminal of the controlled switch.

[0010] Furthermore, the controlled switch is a MOS tube, and its gate serves as a control terminal.

[0011] Furthermore, the strong pulse light self-protection circuit includes a resistor R41, and the gate of the MOS tube is connected to the source via the resistor R41.

[0012] Furthermore, the input end of the optical coupler is connected to current limiting resistors R62 and R63 connected in series, and the input end of the optical coupler specifically receives the intense pulse light PWM control signal via the current limiting resistors R62 and R63.

[0013] The utility model also provides an intense pulsed light therapy device, including an MCU and a xenon lamp, and also including the intense pulsed light self-protection circuit as described above, the second input end of the optical coupler of the intense pulsed light self-protection circuit is connected to the MCU to receive an intense pulsed light PWM control signal, the output end of the optical coupler is connected to the xenon lamp, and the controlled switch control end of the intense pulsed light self-protection circuit is connected to the MCU to receive a heartbeat PWM signal.

[0014] The utility model uses a controlled switch to prevent the intense pulse light from emitting for a long time when an abnormality occurs in the light emitting control program. Specifically, when the MCU's light emitting control program is operating normally, the MCU will continuously send a heartbeat PWM signal to the controlled switch control end. The controlled switch control end will maintain conduction after receiving the heartbeat PWM signal, so that the optical coupler is connected to the input end power supply. In this state, the input end of the optical coupler is conducted to convert the intense pulse light PWM control signal into an intense pulse light output signal output. If the MCU's light emitting control program is abnormal, the MCU will no longer send the heartbeat PWM signal to the controlled switch control end. The controlled switch is disconnected because its control end does not receive the heartbeat PWM signal sent by the MCU, so that the optical coupler is no longer connected to the input end power supply, and the input end of the optical coupler is no longer conducted, so that the optical coupler does not output the intense pulse light output signal. In this way, the xenon lamp will stop emitting light if it does not receive the light output signal, thereby achieving the effect of preventing the intense pulse light from emitting for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the circuit schematic diagram of the intense pulse light self-protection circuit. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with specific implementation methods.

[0017] The intense pulsed light therapy device includes an MCU, an intense pulsed light self-protection circuit and a xenon lamp. Figure 1 As shown, it includes an optical coupler U9, the input end of the optical coupler U9 is connected to the intense pulse light PWM control end of the MCU - Optocoupler U9 port through the current limiting resistors R62 and R63 connected in series, and the output end of the optical coupler U9 is connected to the xenon lamp through the current limiting resistor R64. The input end of the optical coupler U9 receives the intense pulse light PWM control signal sent by the MCU, converts the intense pulse light PWM control signal into an intense pulse light output signal, and outputs it to the xenon lamp from the OUTPUT LIGHT port, so that the xenon lamp emits light.

[0018] In order to prevent the intense pulsed light from emitting for a long time when an abnormality occurs in the light emission control program, the intense pulsed light therapy device is connected with a controlled switch MOS tube Q16 between the optical coupler U9 and the input power supply VCC3.3V. Specifically, the source of the controlled switch MOS tube Q16 is connected to the input power supply VCC3.3V, the drain is connected to the optical coupler U9, and the gate is connected to the source through a resistor R41; the control end of the controlled switch MOS tube Q16, that is, the gate, is connected to a DC isolation circuit 1, which is connected to the heartbeat PWM end of the MCU - the Out light PWM port. The DC isolation circuit 1 includes a capacitor C7 and a rectifier diode D7 connected in series in sequence, and the contact point between the capacitor C7 and the anode of the rectifier diode D7 is grounded through a clamping diode D10. The DC isolation circuit 1 includes a transistor Q17, the base of the transistor Q17 is connected to the cathode of the rectifier diode D7, the emitter is grounded, and the collector is connected to the gate of the controlled switch MOS tube Q16. A current limiting resistor R43 is connected between the collector of transistor Q17 and the gate of controlled switch MOS transistor Q16. A current limiting resistor R44 is connected between the rectifier diode D7 and transistor Q17 in the DC isolation circuit 1. In the DC isolation circuit 1, the junction of the rectifier diode D7 and the resistor R44 is grounded via a filter capacitor C83.

[0019] When the MCU's light control program is running normally, the light control program changes state every 500us through the timer to generate a 1KHz heartbeat PWM signal, which is output from the heartbeat PWM terminal Outlight PWM of the MCU. The capacitor C7 of the DC isolation circuit 1 allows the heartbeat PWM signal to pass through, so that the heartbeat PWM signal is input to the base of the transistor Q17 through the rectifier diode D7 and the current limiting resistor R44. The base of the transistor Q17 is kept at a high level, and the transistor Q17 is turned on, so that the gate of the controlled switch MOS tube Q6 is at a high level, so that the controlled switch MOS tube Q16 remains turned on, so that the input end of the optical coupler U9 is always powered by the power supply terminal VCC3.3V. In this state, the optical coupler U9 converts the strong pulse light PWM control signal into a strong pulse light output signal and outputs it to the xenon lamp from the OUTPUT LIGHT port. If the light control program of the MCU is abnormal, the state cannot be changed every 500us through the timer, that is, a 1KHz heartbeat PWM signal cannot be generated, but a continuous high level or low level (i.e., a DC signal) will be changed. In this way, the heartbeat PWM end of the MCU will only output a high level or a low level DC signal. Since the capacitor C7 of the DC isolation circuit 1 passes AC and isolates DC, the high level or low level DC signal cannot pass through the capacitor C7, and the base level of the transistor Q17 is pulled down, causing the transistor Q17 to be cut off, thereby lowering the level of the gate of the controlled switch MOS tube Q16, and the switch MOS tube Q16 is cut off, causing the input end of the optical coupler U9 to no longer be connected to the power supply end VCC3.3V, so that the input end of the optical coupler U9 is not conducting, and the optical coupler U9 stops working and no longer converts the strong pulse light PWM control signal into the strong pulse light output signal output. The xenon lamp will stop emitting light if it does not receive the strong pulse light output signal, thereby preventing the strong pulse light from emitting light for a long time.

[0020] The above is only an implementation method of the invention, and does not limit the scope of patent protection. Those skilled in the art can make non-substantial changes or substitutions based on the invention, which still fall within the scope of patent protection.

Claims

1. An intense pulse light self-protection circuit, comprising an optical coupler, wherein the input end of the optical coupler receives an intense pulse light PWM control signal, and the optical coupler converts the intense pulse light PWM control signal into an intense pulse light output signal, wherein the circuit is characterized in that: A controlled switch is connected between the optical coupler and the input power supply. The control end of the controlled switch receives the heartbeat PWM signal. The heartbeat PWM signal keeps the controlled switch turned on. When the heartbeat PWM signal disappears, the controlled switch is turned off.

2. The intense pulse light self-protection circuit as claimed in claim 1, characterized in that: The control end of the controlled switch is connected to a DC isolation circuit (1), and the heartbeat PWM signal is received via the DC isolation circuit.

3. The intense pulse light self-protection circuit as claimed in claim 2, characterized in that: The DC blocking circuit (1) comprises a capacitor C7 and a rectifier diode D7 which are connected in series in sequence. The junction point between the capacitor C7 and the anode of the rectifier diode D7 is grounded via a clamping diode D10. The DC blocking circuit (1) also comprises a transistor Q17. The base of the transistor Q17 is connected to the cathode of the rectifier diode D7, the emitter is grounded, and the collector is connected to the control end of the controlled switch.

4. The intense pulse light self-protection circuit as claimed in claim 3, characterized in that: The DC isolation circuit (1) connects a current limiting resistor R44 between the rectifier diode D7 and the transistor Q17.

5. The intense pulse light self-protection circuit as claimed in claim 4, characterized in that: The DC blocking circuit (1) is grounded at the junction of the rectifier diode D7 and the resistor R44 via the filter capacitor C83.

6. The intense pulse light self-protection circuit as claimed in claim 3, characterized in that: A current limiting resistor R43 is connected between the collector of the transistor Q17 and the control terminal of the controlled switch.

7. The intense pulse light self-protection circuit according to any one of claims 1 to 6, characterized in that: The controlled switch is a MOS tube, and its gate serves as a control terminal.

8. The intense pulse light self-protection circuit as claimed in claim 7, characterized in that: It includes a resistor R41, and the gate of the MOS tube is connected to the source via the resistor R41.

9. The intense pulse light self-protection circuit according to claim 1, characterized in that: The input end of the optical coupler is connected to current limiting resistors R62 and R63 connected in series, and the input end of the optical coupler specifically receives the strong pulse light PWM control signal via the current limiting resistors R62 and R63.

10. An intense pulsed light therapy device, comprising an MCU and a xenon lamp, characterized in that: It also includes an intense pulse light self-protection circuit as described in any one of claims 1 to 9, the second input end of the optical coupler of the intense pulse light self-protection circuit is connected to the MCU to receive an intense pulse light PWM control signal, the output end of the optical coupler is connected to a xenon lamp, and the controlled switch control end of the intense pulse light self-protection circuit is connected to the MCU to receive a heartbeat PWM signal.

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