High-voltage discharge circuit of intense pulsed light therapeutic instrument

Abstract

The utility model relates to the field of treatment equipment, in particular to a high-voltage discharge circuit of an intense pulsed light therapeutic instrument. The high-voltage discharge circuit of the intense pulsed light therapeutic instrument comprises a transistor Q1, a high-voltage relay, a mainboard connector, a discharge capacitor and a power discharge resistor, the mainboard connector, the discharge capacitor and the power discharge resistor are isolated by the high-voltage relay, and the high-voltage relay comprises a switch side and a trigger side used for switching on or off states of the switch side; one end of the discharge capacitor and an emitter of the transistor Q1 are grounded together, the other non-grounded end of the discharge capacitor is connected with one terminal of the switch side, a base of the transistor Q1 is connected with the other terminal of the switch side, and the power discharge resistor is connected to the discharge capacitor in parallel in the mode that the power discharge resistor is connected with a collector of the transistor Q1 in series. According to the high-voltage discharge circuit, the discharge current is limited at a relatively low level in a power resistor voltage division mode, so that the heating condition of the discharge resistor in a discharge state can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of treatment equipment, in particular to a high-voltage discharge circuit of an intense pulsed light treatment instrument. Background Art

[0002] An intense pulsed light treatment instrument is a device that uses broad-spectrum intense pulsed light (IPL) for treatment. It applies the principle of selective absorption of light by the skin and treats the skin by periodically emitting high-intensity, multi-wavelength light pulses. These light pulses can penetrate the skin surface and precisely treat different skin problems (such as facial flushing, freckles, age spots, blemishes, telangiectasia, pigmentation, enlarged pores, etc.). Compared with traditional short-wavelength lasers, the intense pulsed light technology has a wider wavelength coverage range, so it can solve multiple skin problems simultaneously. And because the intensity of the light pulse is high and the time is short, they can quickly act on the target tissue while reducing the damage to the surrounding normal tissue. Therefore, intense pulsed light treatment usually has high efficiency, mild side effects after treatment, and quick recovery.

[0003] In the prior art, when the upper limit of the output voltage of the intense pulsed light treatment instrument is relatively high, in order to reduce the output ripple, a filter capacitor with a certain capacitance is generally configured at the output port. However, when the output high voltage is turned off with no load, the filter capacitor will cause the self-discharge speed of the port voltage to slow down. Therefore, a dedicated discharge circuit needs to be added to quickly decrease the output port voltage under specified working conditions. Currently, the commonly used discharge circuit of the DC charging module is as Figure 1 shown, and the discharge circuit is controlled by a discharge enable signal to determine whether it operates. When the DC charging module is in the system, the discharge enable signal is at a low level, the switch tube S is turned off, and the discharge circuit does not operate; when the DC charging module is detached from the system, the discharge enable signal is at a high level, the switch tube S is turned on, and the discharge circuit starts to discharge. Although the control of this discharge circuit is simple and the discharge speed is fast, due to the relatively high output voltage, even up to 600V, a large current and even overheating will occur on the discharge resistor during discharge, which has an adverse effect on the intense pulsed light treatment instrument. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a high-voltage discharge circuit of an intense pulsed light treatment instrument, which can reduce the heating of the discharge resistor in the discharge state.

[0005] To solve the above problems, the present utility model provides a high-voltage discharge circuit for a intense pulsed light therapeutic apparatus, which includes a transistor Q1, a high-voltage relay, a main board connector, and a discharge capacitor and a power discharge resistor connected in parallel. The high-voltage relay includes a switch side and a trigger side for switching the on or off state of the switch side, and the contact distance between the switch side and the trigger side is greater than a preset degree; one end of the discharge capacitor is grounded together with the emitter of the transistor Q1, and the other non-grounded end of the discharge capacitor is connected to a terminal of the switch side. The base of the transistor Q1 is connected to the other terminal of the switch side. The power discharge resistor is connected in parallel to the discharge capacitor in a manner of being connected in series with the collector of the transistor Q1; the trigger side of the high-voltage relay is connected to the output end of the main board connector, and a controller electrically connected to the input end of the main board connector is further included; the high-voltage relay triggers the switch side to conduct according to the discharge signal received from the controller by the main board connector, thereby connecting the discharge capacitor and the transistor Q1 to achieve discharge.

[0006] Further, the high-voltage relay is specifically a high-voltage dry reed signal relay of model LI24-1A85.

[0007] Further, voltage-dividing resistor groups are respectively connected in series at both ends of the switch side of the high-voltage relay.

[0008] Further, the main board connector is specifically a wire-to-board connector of model A2008WVA-2P.

[0009] Further, the power discharge resistor includes a plurality of 10K / 50W metal power resistors connected in parallel.

[0010] Further, the discharge current of the power discharge resistor is not greater than 240 mA.

[0011] Further, a discharge indicator light group connected in parallel to the power discharge resistor is further included, and the discharge indicator light group includes light-emitting diodes with the current flow direction all being the same as that of the transistor Q1.

[0012] Further, the discharge indicator light group includes a plurality of the light-emitting diodes connected in parallel, and after these light-emitting diodes are connected in parallel, they are connected in series with a buffer resistor together.

[0013] Further, at least two voltage-regulating diodes connected in series to the base of the transistor Q1 are further included, and the current flow direction of the voltage-regulating diodes is all the same as that of the transistor Q1.

[0014] Further, the transistor Q1 is specifically a high-power triode of model BU508A.

[0015] Beneficial effects: The high-voltage discharge circuit of the intense pulsed light therapeutic apparatus of the present utility model includes a transistor Q1, a high-voltage relay, a main board connector, a discharge capacitor, and a power discharge resistor. The high-voltage relay is used to isolate the main board connector from the discharge capacitor and the power discharge resistor. The high-voltage relay includes a switch side and a trigger side for switching the on or off state of the switch side. The contact spacing between the switch side and the trigger side is greater than a preset degree, avoiding the easy generation of electric arcs in the high-voltage circuit and burning out the relay. One end of the discharge capacitor is grounded together with the emitter of the transistor Q1, and the other non-grounded end of the discharge capacitor is connected to a terminal of the switch side. The base of the transistor Q1 is connected to the other terminal of the switch side. The power discharge resistor is connected in series with the collector of the transistor Q1 and is connected in parallel to the discharge capacitor. The high-voltage discharge circuit limits the discharge current to a lower level by means of voltage division of the power resistor, thereby being able to reduce the heating of the discharge resistor in the discharge state. Description of the Drawings

[0016] Figure 1 is a schematic diagram of a prior art high-voltage discharge circuit.

[0017] Figure 2 is a schematic diagram of the high-voltage discharge circuit of the intense pulsed light therapeutic apparatus. Detailed Embodiments

[0018] The following further details the present invention in conjunction with specific embodiments.

[0019] The high-voltage discharge circuit of the intense pulsed light therapeutic apparatus in this embodiment is shown in Figure 2 , and includes a main board connector, a high-voltage relay, a discharge capacitor, a power discharge resistor, and a transistor Q1. The high-voltage relay is used to isolate the main board connector from the discharge capacitor and the power discharge resistor. The high-voltage discharge circuit is specifically a 600V high-voltage capacitor discharge circuit, and the discharge capacitor is a large capacitor of 22000uF / 450V connected in two parallel and two series at the CON1 port in Figure 2 . Among them, the main board connector is specifically a wire-to-board connector of model A2008WVA-2P; the high-voltage relay is specifically a high-voltage dry reed signal relay of model LI24-1A85; the power discharge resistor includes a plurality of 10K / 50W metal power resistors connected in parallel; the transistor Q1 is specifically a high-power triode of model BU508A.

[0020] The high-voltage relay includes a switch side and a trigger side for switching the on or off state of the switch side. Voltage-dividing resistor groups are connected in series at both ends of the switch side of the high-voltage relay. One end of the discharge capacitor is grounded together with the emitter of transistor Q1. The non-grounded end of the discharge capacitor is connected to a terminal of the switch side through a voltage-dividing resistor group R1 and R2. The base of transistor Q1 is connected to another terminal of the switch side through a voltage-dividing resistor group R5 and R8. These resistors all use 75K / 2W power resistors. The power discharge resistor is connected in parallel to the discharge capacitor in a way that it is connected in series with the collector of transistor Q1. Among them, the power discharge resistor is Figure 2 four 10K / 50W metal power resistors connected in parallel at the CON3 port in

[0021] The trigger side of the high-voltage relay is connected to the output end of the main board connector. It also includes a controller electrically connected to the input end of the main board connector. The controller outputs a discharge signal according to the user's input or a pre-recorded control program. This discharge signal is specifically a controllable 24V voltage input from the main board, and this voltage is used to trigger the high-voltage relay. The high-voltage relay triggers the switch side to conduct according to the discharge signal received from the controller through the main board connector. The contact spacing between the switch side and the trigger side of the high-voltage relay is greater than a preset degree (such as the contact spacing of a high-voltage reed signal relay) to avoid easily generating an arc in the high-voltage circuit and burning out the relay. After the switch side of the high-voltage relay conducts, it drives the power triode BU508A to work, thereby connecting the discharge capacitor and transistor Q1 to achieve discharge. In this embodiment, a power triode is used instead of a high-power MOS tube, eliminating the need to reserve the VGS voltage for the MOS tube to conduct, and avoiding the situation where the charge of the large capacitor cannot be released completely.

[0022] Among them, the high-voltage discharge circuit also includes at least two voltage-regulating diodes of model 1N5408 connected in series at the base of transistor Q1. The current flow directions of the voltage-regulating diodes are all the same as that of transistor Q1, and the reverse breakdown voltage is not less than 1000V, improving the safety factor of the discharge circuit.

[0023] Among them, the high-voltage discharge circuit also includes a discharge indicator light group connected in parallel with the power discharge resistor. The discharge indicator light group includes a plurality of light-emitting diodes LED1 and LED2 connected in parallel with the current flow directions all the same as that of transistor Q1. These light-emitting diodes are connected in parallel and then connected in series with a buffer resistor R7 together to achieve power indication.

[0024] The above is only the implementation mode of the present invention, and it does not limit the scope of patent protection. Those skilled in the art make non-substantive changes or substitutions based on the present invention, and still fall within the scope of patent protection.

Claims

1. A high voltage discharge circuit for an intense pulsed light therapy device, characterized in that: The invention comprises a transistor Q1, a high-voltage relay, a mainboard connector, and a discharge capacitor and a power discharge resistor connected in parallel. The high-voltage relay comprises a switch side and a trigger side for switching the switch side to an on or off state. The contact spacing between the switch side and the trigger side is greater than a preset degree. One end of the discharge capacitor is grounded together with the emitter of the transistor Q1, the other non-grounded end of the discharge capacitor is connected to a terminal of the switch side, the base of the transistor Q1 is connected to another terminal of the switch side, and the power discharge resistor is connected in parallel to the discharge capacitor in a manner of being connected in series with the collector of the transistor Q1. The trigger side of the high-voltage relay is connected to the output end of the mainboard connector, and also comprises a controller electrically connected to the input end of the mainboard connector. The high-voltage relay triggers the switch side to be turned on according to the discharge signal received by the mainboard connector from the controller, thereby connecting the discharge capacitor and the transistor Q1 to achieve discharge.

2. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1, characterized in that: The high voltage relay is specifically a high voltage reed signal relay of model LI24-1A85.

3. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1 or 2, characterized in that: The two ends of the high-voltage relay switch side are respectively connected in series with a voltage-dividing resistor group.

4. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1, characterized in that: The motherboard connector is specifically a wire-to-board connector with model number A2008WVA-2P.

5. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1, characterized in that: The power discharge resistor includes a plurality of 10K / 50W metal power resistors connected in parallel.

6. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1 or 5, characterized in that: The discharge current of the power discharge resistor is no more than 240 mA.

7. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1 or 5, characterized in that: It also includes a discharge indicator light group connected in parallel with the power discharge resistor, and the discharge indicator light group includes a light emitting diode whose current flow direction is consistent with that of the transistor Q1.

8. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 7, characterized in that: The discharge indicator light group includes a plurality of light emitting diodes connected in parallel, and the light emitting diodes are connected in parallel and connected in series with a buffer resistor.

9. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1, characterized in that: It also includes at least two voltage-stabilizing diodes connected in series to the base of the transistor Q1 , and the current flow directions of the voltage-stabilizing diodes are consistent with that of the transistor Q1 .

10. The high-voltage discharge circuit of the intense pulsed light therapy device as claimed in claim 1, characterized in that: The transistor Q1 is specifically a high-power triode of model BU508A.

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