CN115038206A - Lamp tube trigger circuit and phototherapy instrument - Google Patents

Abstract

The application relates to the field of beauty instruments and discloses a lamp tube trigger circuit and a phototherapy instrument. The first end of the energy storage unit is grounded, the second end of the energy storage unit is connected with the first end of the lamp tube, the energy storage unit is used for storing electric energy, and when the energy storage unit releases the electric energy, a voltage difference is formed between the two ends of the lamp tube; the trigger unit is used for generating trigger voltage, the trigger voltage acts on the surface of the glass, and the second end of the trigger unit is grounded; the first end of the equivalent resistor is connected with the second end of the energy storage unit, and the second end of the equivalent resistor is connected with the first end of the trigger unit; the switch unit is used for controlling the energy storage unit to release electric energy or stop releasing the electric energy. The application provides a fluorescent tube trigger circuit, the release and the stop release of electric energy in can the control circuit, and more accurate to the luminous control of fluorescent tube, the electro-optical conversion rate is high.

Description

Lamp tube trigger circuit and phototherapy instrument

Technical Field

The application relates to the technical field of beauty instruments, in particular to a lamp tube trigger circuit and a phototherapy instrument.

Background

With the improvement of living standard, the requirements of people on living quality are higher and higher, and scientific technology is applied more and more in the aspect of living. Especially, people pay more and more attention to the beauty and quality of skin. Depilatory devices have been developed for the aesthetic appearance and quality of skin.

The existing depilating instrument comprises a lamp tube and a driving circuit, wherein the lamp tube needs a large current to drive the lamp tube to emit light, and the current in the driving circuit is a weak current relative to the large current, so that the large current flowing through the lamp tube cannot be stopped in time when the lamp tube stops working, the energy consumption is wasted, and unnecessary heating is generated.

Disclosure of Invention

The application provides a fluorescent tube trigger circuit and phototherapy instrument can in time stop the heavy current of fluorescent tube of flowing through, reduces the energy consumption and generates heat.

In order to solve the above problems, the present application provides a lamp tube trigger circuit, which includes a lamp tube, an energy storage unit, a trigger unit, and an equivalent resistor; the first end of the energy storage unit is grounded, the second end of the energy storage unit is connected with the first end of the lamp tube, the lamp tube is provided with a glass surface, the energy storage unit is used for storing electric energy, and when the energy storage unit releases the electric energy, a voltage difference is formed between the two ends of the lamp tube; the trigger unit is used for generating trigger voltage, the trigger voltage acts on the surface of the glass, and the second end of the trigger unit is grounded; the first end of the equivalent resistor is connected with the second end of the energy storage unit, and the second end of the equivalent resistor is connected with the first end of the trigger unit; the switch unit, the energy storage unit and the lamp tube are connected in series and form at least one part of a lamp tube working current loop together, the switch unit is used for switching on or switching off the lamp tube working current loop main control unit, and the main control unit is indirectly or directly connected with the switch unit; and the identification circuit is connected with the main control unit and is used for controlling the switch unit to be switched on or switched off through the main control unit.

In order to solve the above problems, the present application further provides a phototherapy apparatus, including a main control unit and the above lamp tube trigger circuit, wherein the main control unit is configured to output a control signal; wherein the switching unit is turned on or off based on the control signal.

The energy storage unit of the lamp tube trigger circuit releases electric energy and stops releasing the electric energy, and the energy storage unit are controllable. Therefore, the energy storage unit does not need to be stopped after being conducted and completely discharged, the circuit can be controlled to be disconnected by the switch unit after the lamp tube cannot emit light, the energy storage unit stops releasing electric energy, and the rest electric energy is stored instead of being converted into heat energy to be dissipated. Therefore, the lamp tube trigger circuit has low energy consumption and less unnecessary heating.

Drawings

FIG. 1 is a schematic circuit diagram of an embodiment of a lamp trigger circuit according to the present application;

fig. 2 is a schematic circuit diagram of another embodiment of the lamp trigger circuit according to the present application. 10, an energy storage unit; 11. an energy storage capacitor; 20. an equivalent resistance; 30. a lamp tube; 31. a glass surface; 40. a trigger unit; 41. a trigger; 42. a first capacitor; 50. a voltage doubling unit; 51. a second capacitor; 52. a first diode; 60. a switch unit; 61. a switching tube; 62. a driver; 70. a main control unit; 80. a second diode; 90. and (4) protecting the resistor.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures associated with the present application are shown in the drawings, not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "coupled" in this application may refer to either a direct connection or an indirect connection through a third party component.

Fig. 1 is a schematic circuit diagram of an embodiment of a lamp trigger circuit according to the present invention.

As shown in fig. 1, to solve the above problem, the present application provides a lamp triggering circuit, which includes an energy storage unit 10, a triggering unit 40, an equivalent resistor 20 (shown in fig. 2), and a switch unit 60. The first end of the energy storage unit 10 is grounded, the second end of the energy storage unit 10 is connected with the first end of the lamp tube 30, and the lamp tube 30 has a glass surface 31; the energy storage unit 10 is used for storing electric energy, and when the energy storage unit 10 releases the electric energy, a voltage difference is formed between two ends of the lamp tube 30; the trigger unit 40 is used for generating a trigger voltage, the trigger voltage acts on the glass surface 31, and the second end of the trigger unit 40 is grounded; a first terminal of the equivalent resistor 20 is connected to the second terminal of the energy storage unit 10, and a second terminal of the equivalent resistor 20 is connected to a first terminal of the triggering unit 40. One end of the switch unit 60 is connected to the first end of the energy storage unit 10, and the other end is used for connecting to the second end of the lamp 30.

The switch unit 60, the energy storage unit 10 and the lamp 30 are connected in series and together form at least a part of a lamp working current loop, and the switch unit is used for switching on or off the lamp working current loop.

The switch unit 60 can control the energy storage unit 10 to release electric energy, and also can control the energy storage unit 10 to stop releasing electric energy, so that the lamp tube trigger circuit provided by the present application can more accurately control the energy storage unit 10 to release electric energy, improve the utilization efficiency of electric energy, and save energy. For example, the switch unit 60 controls the energy storage unit 10 to release the electric energy, and when the electric energy in the energy storage unit 10 decreases to a preset ratio of the electric capacity of the energy storage unit 10, the switch unit 60 controls the energy storage unit 10 to stop releasing the electric energy. In some applications of the present application, the circuit cannot function when the power in the energy storage unit 10 is reduced below a predetermined ratio of the capacitance of the energy storage unit 10. Then if the energy storage unit 10 continues to discharge power, there is no effect on the circuit, and this power is wasted. In the solution of the present application, the switch unit 60 controls the energy storage unit 10 to stop releasing the electric energy at the preset ratio, so as to save the remaining electric energy, thereby achieving the purpose of saving energy. The situation that the rest electric energy is converted into heat energy to be accumulated in the machine body can be prevented, and therefore the heating of the machine body is reduced.

The switching unit 60 controls the energy storage unit 10 to release the electric energy, so that the operation of the energy storage unit 10 is more controllable. In some application scenarios of the present application, the energy storage unit 10 is required to discharge at a fixed frequency. At this time, the energy storage unit 10 can be controlled to release the electric energy according to a certain frequency and stop releasing the electric energy by controlling the switch unit 60.

Alternatively, the lamp 30 in the present application may be a lamp 30 filled with inert gas, and may emit light when both the trigger voltage and the voltage across the lamp are satisfied, i.e., convert electrical energy into light energy. The trigger voltage is the voltage applied to the glass surface 31 of the lamp tube 30, and is typically a relatively high voltage. For example, the tube 30 may be a xenon lamp tube.

Fig. 2 is a schematic circuit diagram of another embodiment of the lamp trigger circuit of the present application.

Referring to fig. 2, the energy storage unit 10 may optionally include an energy storage capacitor 11. The first end of the energy storage capacitor 11 is grounded, and the second end of the energy storage capacitor 11 is connected to the first end of the lamp 30. The energy storage capacitor 11 may be charged by an external power source and may be discharged after being charged to a certain extent or for a certain time.

Alternatively, the equivalent resistor 20 may be the equivalent resistor 20 of other circuit components in the lamp trigger circuit. The equivalent resistor 20 may be another resistor connected to the circuit to perform an equivalent resistance in the lamp triggering circuit. The resistance value of the equivalent resistor 20 can be set or adjusted according to actual needs.

The switch unit 60 controls the energy storage unit 10 to discharge, and may be that the energy storage unit 10 releases electric energy when the switch unit 60 is turned on, or that the energy storage unit 10 releases electric energy when the switch is turned off, specifically, what kind of circuit structure the lamp tube trigger circuit realizes the control of the switch unit 60 to discharge the energy storage unit 10. In the present embodiment, it is assumed that "when the switch unit 60 is turned on, the energy storage unit 10 releases electric energy; the energy storage unit 10 stops releasing the electric energy "when the switching unit 60 is turned off.

Optionally, the lamp triggering circuit includes a voltage doubling unit 50. The first terminal of the switch unit 60 is connected to the third terminal of the voltage doubling unit 50 and the second terminal of the lamp tube 30, and the second terminal of the switch unit 60 is grounded. Therefore, when the switch unit 60 is turned on, the potential of the second terminal of the equivalent resistor 20 becomes zero instantaneously.

Optionally, the first end of the voltage doubling unit 50 is connected to the second end of the equivalent resistor 20, the second end of the voltage doubling unit 50 is connected to the second end of the lamp 30, and the first end of the switch unit 60 is connected to the third end of the voltage doubling unit 50 and the second end of the lamp 30. When the circuit works, the external power supply charges the energy storage unit 10, so that when the voltage of the energy storage power supply reaches a preset value, the switch unit 60 is controlled to be switched on, and the voltage difference between the two ends of the lamp tube 30 is several times of the preset value. The specific multiple can be set according to actual conditions.

Optionally, the voltage doubling unit 50 includes a first diode 52 and at least one second capacitor 51, the anode of the first diode 52 is connected to the second terminal of the equivalent resistor 20, the cathode of the first diode 52 is used as the third terminal to connect the first terminal of the switch unit 60 and the first terminal of the second capacitor 51, and the second terminal of the second capacitor 51 is connected to the second terminal of the lamp 30. By utilizing the property that the capacitor voltage cannot change suddenly, the voltage difference required by the light emission can be more easily provided at the two ends of the lamp tube 30.

Optionally, the switching unit 60 includes a switching tube 61 and a driver 62, a first end of the switching tube 61 is connected to the cathode of the first diode 52 and the second end of the lamp 30, a second end of the switching tube 61 is connected to ground and the second end of the energy storage unit 10, an output end of the driver 62 is connected to the control end of the switching tube 61, and the driver 62 is configured to provide a driving signal required for turning on or off the switching tube 61.

The driver 62 controls the on/off of the switch tube 61, and further can control the release of the energy storage unit 10 to the electric energy. The driving signal may be a high-low level output by the driver 62 for triggering the switching tube 61 to be turned on and off. Alternatively, the switch tube 61 may be an igbt (insulated Gate Bipolar transistor). The IGBT driving device has the advantages of small power required by IGBT driving, low saturation voltage, suitability for a current transformation system with direct-current voltage of more than 600V, and capability of further reducing the power consumption of a lamp tube trigger circuit, wherein the current transformation system comprises a lighting circuit. In other embodiments of the present application, the switching tube 61 may also be an electronic device such as a field effect transistor, a triode, a power transistor, or the like, which can implement a switching function.

Optionally, the trigger unit 40 comprises a first capacitor 42 and a trigger 41. A first end of the first capacitor 42 is connected with a second end of the equivalent resistor 20; the trigger 41 is used for generating a trigger voltage, a first terminal of the trigger 41 is connected to the second terminal of the first capacitor 42, and a second terminal of the trigger 41 is grounded.

When the voltage at the first end of the first capacitor 42 changes abruptly, due to the property of the capacitor itself, the potential difference between the two ends of the first capacitor 42 cannot change abruptly, so the voltage at the second end of the first capacitor 42 changes abruptly correspondingly, and the change amount is the same as that at the first end.

As shown in fig. 2, the trigger 41 may alternatively be composed of two inductors and an iron core, and the two inductors are arranged in parallel. A third end of trigger 41 may contact glass surface 31 of lamp tube 30. Since the second terminal of the trigger 41 is grounded, when the voltage of the first terminal of the trigger 41 changes abruptly, the two inductors generate mutual inductance, and an induced voltage is generated at the third terminal of the trigger 41. For example, when the voltage of the first terminal of the flip-flop 41 changes from 0V to-400V, the third terminal of the flip-flop 41 will generate a transient high voltage higher than-6 KV. The second terminal of the flip-flop 41 is grounded, and the second terminal of the first capacitor 42 is grounded through the inductor when the circuit is static, so that the voltage at the second terminal of the first capacitor 42 is 0V when the circuit is static. When the circuit is static, the current, voltage and the like of each part in the circuit are not changed.

In one embodiment of the present embodiment, the external power source charges the energy storage unit 10. When the voltage of the energy storage unit 10 reaches a predetermined value, for example, 400V, the voltage of the first end of the first capacitor 42 is the same as the voltage of the energy storage unit 10, which is also 400V, and the voltage of the second end of the first capacitor 42 is 0V. At this time, the control switch unit 60 is turned on, and the voltage of the first terminal of the first capacitor 42 is instantaneously changed to 0V, so that the second terminal of the first capacitor 42 is instantaneously changed from 0V to-400V. At this time, the voltage of the first terminal of the trigger 41 changes from 0V to-400V instantaneously, and the third terminal of the trigger 41 generates instantaneous high voltage of more than-6 KV to act on the glass surface 31 of the lamp 30. Assuming that the first condition for lighting lamp 30 is that a trigger voltage higher than-6 KV appears on the glass surface 31, the instantaneous high voltage generated at the third terminal of trigger 41 can satisfy the first condition for lighting lamp 30.

In one embodiment of the present embodiment, the preset value of the voltage of the energy storage unit 10 is 400V. The external power source charges the energy storage unit 10, when the voltage of the energy storage unit 10 reaches a preset value, the circuit is in a static state, the voltage of the first end of the second capacitor 51 is the same as the voltage of the energy storage unit 10, and the voltage of the second end of the second capacitor 51 is 0V. At this time, the control switch unit 60 is turned on, the voltage of the first terminal of the second capacitor 51 instantaneously becomes 0V, and the voltage of the second terminal of the second capacitor 51 instantaneously becomes-400V because the second capacitor 51 cannot suddenly change due to the potential difference. Therefore, the voltage of the first terminal of the lamp 30 is equal to the voltage of the energy storage unit 10, the voltage of the other terminal is equal to-400V, and the voltage difference between the two terminals of the lamp 30 is 800V. Lamp 30 can emit light when the conditions of trigger voltage and terminal voltage are satisfied simultaneously, for example, the glass surface 31 of lamp 30 has trigger voltage over-6 KV, and the voltage difference between the two ends reaches 800V, at which time lamp 30 emits light. The preset value of the voltage of the energy storage unit 10 may also be other values of voltage, which is only an example.

Optionally, the lamp striking circuit comprises a second diode 80. The second diode 80 is connected in series between the second end of the lamp 30 and the other end of the switch unit 60, the anode of the second diode 80 is connected to the second end of the lamp 30, and the cathode of the second end of the lamp 30 is connected to the other end of the switch unit 60. The second diode 80 is used for connecting the switch unit 60 and the lamp tube 30, so that the voltage of the second end of the second capacitor 51, namely the second end of the lamp tube 30 can reach-400V, the voltage of the second end of the second capacitor 51 cannot be changed due to reverse voltage, and the realization of the function of the voltage doubling circuit is ensured.

Optionally, the lamp striking circuit comprises a protection resistor 90. The first end of the protection resistor 90 is connected to the second end of the lamp 30, and the second end of the protection resistor 90 is grounded. When the voltage at the second end of the lamp 30 changes from 0V to less than 0V under the action of the voltage multiplier circuit, a potential difference exists between the second end of the lamp and the ground potential, and the existence of the protective resistor 90 can avoid the circuit from being burnt out by excessive current. The resistance value of the protection resistor 90 can be set relatively large so that the protection circuit is not burned out. The resistance of the protection resistor 90 is set to be larger, so that the current flowing through the protection resistor cannot make the lamp 30 maintain a light-emitting state, and at this time, the protection resistor 90 is too small for the lamp 30, which is equivalent to an open circuit state. Optionally, the lamp triggering circuit may also have no protection resistor 90, and the protection resistor 90 is in an off state.

In one embodiment of the present application, the preset voltage of the energy storage capacitor 11 is 400V, and the lamp 30 needs to provide a trigger voltage of more than-6 KV and a voltage difference between two ends of the lamp 30 of 800V at the same time when the lamp emits light. The external power supply charges the energy storage unit 10, the voltage of the energy storage unit 10 reaches a preset value, and at this time, the circuit is in a static state. In this case, the capacitor corresponds to an open circuit, and the resistor corresponds to a conductive line. Therefore, the voltage of the first terminals of the first capacitor 42 and the second capacitor 51 is the same as the voltage of the energy storage capacitor 11, the first capacitor 42 is grounded through the trigger 41, and therefore the second terminal of the first capacitor 42 is 0V. The second capacitor 51 is grounded through the protection resistor 90, so the second terminal of the second capacitor 51 is also 0V. Due to the presence of the second diode 80, the energy storage capacitor 11 is also difficult to discharge through the protection resistor 90, and there is no current flow from the second terminal of the energy storage capacitor 11 to the second terminal of the second diode 80, the second terminal of the second diode 80 to the protection resistor 90 and then to ground. At this time, the control switch 61 is turned on, and the circuit changes instantaneously. The first terminals of the first capacitor 42 and the second capacitor 51, respectively, become 0V and the second terminals thereof become-400V. Due to the presence of the second diode 80, no reverse current from the switching tube 61 to the second diode 80 occurs. Therefore, the second terminal of the second capacitor 51 becomes-400V, but no current is generated between the switch tube 61 and the ground. Therefore, the voltage of the first terminal of the trigger 41 is instantaneously changed from 0V to 400V, so that the third terminal of the trigger 41 generates an instantaneous high voltage of-6 KV or more on the glass surface 31 of the lamp 30. Meanwhile, the voltage difference between the two ends of the lamp 30 is 800V. Meanwhile, the conditions of the trigger voltage and the voltage difference between the two ends of the lamp 30 are met, and the lamp 30 emits light.

After the lamp 30 emits light, the energy storage capacitor 11 continuously discharges, and the voltage of the energy storage capacitor 11 decreases accordingly. The lamp 30 is used when the power of the energy storage capacitor 11 is reduced to a predetermined ratio. When the switch tube 61 is turned off, no current is generated in the circuit, and the lamp 30 is extinguished.

After the preset time interval, the control switch 61 is turned off, the energy storage capacitor 11 stops discharging, and the remaining electric energy is still stored in the energy storage capacitor 11. The preset time may be longer or shorter than the time for reducing the electric energy of the energy storage capacitor 11 to a preset proportion, and is specifically set as required. If high-frequency flickering light is needed, the preset time can be set to be shorter than the time for reducing the electric energy of the energy storage capacitor 11 to the preset proportion; if there is no need for high frequency flicker, the preset time can be set to be longer than the time for reducing the electric energy of the energy storage capacitor 11 to the preset proportion, so that unnecessary electric energy waste can be saved.

In one embodiment of the present embodiment, the lamp triggering circuit controls the energy storage capacitor 11 to discharge through the thyristor. The silicon controlled rectifier is switched on after receiving the signal, and after a period of time, the current or the voltage in the circuit can not meet the condition of keeping on, the silicon controlled rectifier is automatically switched off. But the thyristor cannot be actively controlled to be disconnected by a signal. The energy storage unit 10 will discharge after switching on until the thyristor switches off. After the energy of the energy storage capacitor 11 is reduced to a preset ratio, the lamp is extinguished. The subsequent energy storage capacitor 11 continues to discharge, the lamp tube 30 cannot emit light, the subsequent electric energy is converted into heat energy, and the electro-optic conversion rate is low. This heat energy is again accumulated inside the machine, causing significant heating of the fuselage. In addition, the time for the energy storage capacitor 11 to discharge the electric energy is not precise enough, which results in that the control of the light emission of the lamp tube 30 is not precise enough, and the consistency of the light energy released during each lighting is poor.

The switch unit 60 can control the energy storage unit 10 to discharge and also control the energy storage unit 10 to stop discharging. Therefore, part of the electric energy in the energy storage unit 10 for converting into light energy can be saved, and energy waste can be reduced.

Optionally, an identification circuit (not shown) for controlling the switch unit 60 to be turned on or off through the main control unit 70 is further included, and the identification circuit is connected to the main control unit.

In order to solve the above problems, the present application further provides a phototherapy apparatus, which includes a main control unit 70 and the above lamp tube trigger circuit, wherein the main control unit 70 is configured to output a control signal; wherein the switching unit 60 is turned on or off based on the control signal.

The main control unit 70 outputs a control signal to the driver 62, and the driver 62 drives the switch tube 61 to be switched on or switched off, so that the electric energy release and the electric energy stop are controllable, the energy is saved, the electro-optic conversion rate is improved, the polishing interval is accurate and controllable, and the user experience is improved.

Optionally, the phototherapy apparatus further includes an identification circuit (not shown) for controlling the switch unit 60 to be turned on or off through the main control unit 70, and the identification circuit is connected to the main control unit.

Optionally, the identification circuit may be a key on the housing of the phototherapy apparatus, and the user presses the key to control the switch unit 60 to be turned on through the main control unit 70, so as to light the lamp tube 30 for phototherapy. For releasing the key, the switch unit 60 is turned off, thereby extinguishing the lamp 30.

Optionally, the identification circuit may also be an inductive switch or circuit on the surface of the end of the phototherapy instrument contacting the skin, and generates a signal by contacting the skin to trigger the main control unit 70 to control the switch unit 60 to be turned on, thereby lighting the lamp 30. Otherwise, the lamp 30 is extinguished.

The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent arrangements made by the contents of the present specification and drawings or applied to other related technical fields are also included in the scope of the present invention.

Claims (10)

1. A phototherapy instrument, comprising:

the second end of the energy storage unit is connected with the first end of the lamp tube, the lamp tube is provided with a glass surface, and when the energy storage unit releases electric energy, a voltage difference is formed between the two ends of the lamp tube;

the trigger unit is used for generating trigger voltage, the trigger voltage acts on the glass surface, and the second end of the trigger unit is grounded;

the first end of the equivalent resistor is connected with the second end of the energy storage unit, and the second end of the equivalent resistor is connected with the first end of the trigger unit;

the switch unit is connected with one end of the energy storage unit, the other end of the switch unit is used for being connected with the second end of the lamp tube, the switch unit, the energy storage unit and the lamp tube are connected in series and form at least one part of a lamp tube working current loop together, and the switch unit is used for switching on or switching off the lamp tube working current loop;

the main control unit is indirectly or directly connected with the switch unit;

and the identification circuit is connected with the main control unit and is used for controlling the switch unit to be switched on or switched off through the main control unit.

2. A phototherapy instrument according to claim 1, comprising:

the first end of the voltage doubling unit is connected with the second end of the equivalent resistor, and the second end of the voltage doubling unit is connected with the second end of the lamp tube;

the first end of the switch unit is connected with the third end of the voltage doubling unit and the second end of the lamp tube.

3. The phototherapy apparatus according to claim 2,

the voltage doubling unit comprises a first diode and at least one second capacitor, the anode of the first diode is connected with the second end of the equivalent resistor, the cathode of the first diode is used as the third end to be connected with the first end of the switch unit and the first end of the at least one second capacitor, and the second end of the at least one second capacitor is connected with the second end of the lamp tube.

4. A phototherapy instrument according to claim 2 or 3, comprising:

the second diode is connected between the second end of the lamp tube and the other end of the switch unit in series, the anode of the second diode is connected with the second end of the lamp tube, and the cathode of the second end of the lamp tube is connected with the other end of the switch unit.

5. The phototherapy apparatus according to claim 3,

the switch unit comprises a switch tube and a driver, wherein the first end of the switch tube is connected with the cathode of the first diode, the second end of the switch tube is grounded and connected with the second end of the energy storage unit, the output end of the driver is connected with the control end of the switch tube, and the driver is used for providing a driving signal required by switching on or switching off the switch tube.

6. The phototherapy apparatus according to claim 1,

the trigger unit comprises a first capacitor and a trigger, wherein the first end of the first capacitor is connected with the second end of the equivalent resistor;

the trigger is used for generating the trigger voltage, the first end of the trigger is connected with the second end of the first capacitor, and the second end of the trigger is grounded.

7. A phototherapy instrument according to claim 1, comprising:

and the first end of the protection resistor is connected with the second end of the lamp tube, and the second end of the protection resistor is grounded.

8. The phototherapy apparatus according to claim 1,

the energy storage unit comprises an energy storage capacitor, the first end of the energy storage capacitor is grounded, and the second end of the energy storage capacitor is connected with the first end of the lamp tube.

9. A phototherapy instrument according to claim 1, comprising:

when the electric energy in the energy storage unit is reduced to the preset proportion of the electric capacity of the energy storage unit, the switch unit controls the energy storage unit to stop releasing the electric energy.

10. A lamp triggering circuit, comprising:

the second end of the energy storage unit is connected with the first end of the lamp tube, the lamp tube is provided with a glass surface, and when the energy storage unit releases electric energy, a voltage difference is formed between the two ends of the lamp tube;

the trigger unit is used for generating trigger voltage, the trigger voltage acts on the glass surface, and the second end of the trigger unit is grounded;

the first end of the equivalent resistor is connected with the second end of the energy storage unit, and the second end of the equivalent resistor is connected with the first end of the trigger unit;

the switch unit is connected with one end of the energy storage unit, the other end of the switch unit is used for being connected with the second end of the lamp tube, the switch unit, the energy storage unit and the lamp tube are connected in series and form at least one part of a lamp tube working current loop together, and the switch unit is used for switching on or switching off the lamp tube working current loop;

the main control unit is indirectly or directly connected with the switch unit;

and the identification circuit is connected with the main control unit and is used for controlling the switch unit to be switched on or switched off through the main control unit.

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