A pulse xenon lamp pre-ignition circuit

Abstract

The present invention discloses a pulse xenon lamp pre-ignition circuit. The pulse xenon lamp pre-ignition circuit provided by the present invention first performs a primary voltage boost on the xenon lamp high-voltage DC power supply through a voltage boost circuit, and then performs a secondary voltage boost on the xenon lamp high-voltage DC power supply through a voltage doubler circuit. At the same time, the voltage doubler circuit can also continuously maintain a stable output of high voltage during the process of achieving the secondary voltage boost. In this way, the pre-ignition high-voltage module is enabled to output high voltage by using the voltage doubler circuit to trigger the pre-ignition of the xenon lamp, which can continuously provide a stable high-voltage pulse signal for the xenon lamp, thereby achieving reliable and stable triggering of the pre-ignition of the xenon lamp under long cable transmission, and solving the problem that the traditional xenon lamp pre-ignition circuit cannot reliably trigger the pre-ignition of the xenon lamp under long cable transmission. In addition, the use of the voltage doubler circuit to output high voltage to trigger the pre-ignition of the xenon lamp also reduces the number of transformers, thereby reducing the volume and cost of the pulse xenon lamp pre-ignition circuit, making it suitable for large-scale application and promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of pulse xenon lamp pre-ignition, and in particular relates to a pulse xenon lamp pre-ignition circuit. Background Art

[0002] Pulse xenon lamp pre-combustion technology is widely used in military fields such as nuclear fusion and high-power lasers, as well as civilian fields such as laser cosmetology, laser medical treatment and laser cutting. The principle of pulse xenon lamp pre-combustion technology is to trigger the pre-combustion of the pulse xenon lamp by outputting high voltage and providing a stable current to keep the pulse xenon lamp continuously turned on.

[0003] The voltage required to trigger the pulse xenon lamp to turn on is several thousand volts, or even more than ten thousand volts. In order to ensure the pre-ignition of the pulse xenon lamp, the xenon lamp pre-ignition circuit needs to continuously output a stable high voltage. At present, most general xenon lamp pre-ignition circuits use a trigger circuit and generate a high-voltage pulse through a trigger transformer to pre-ignite the xenon lamp. However, this triggering method is not suitable for the pre-ignition of pulse xenon lamps under long cable transmission. The reason is that the transformer cannot continuously output a stable high-voltage pulse, and under long cable transmission, the cable itself has large capacitance and inductance. When transmitting the high-voltage pulse signal, the cable's own capacitance and inductance will absorb the energy of the high-voltage pulse signal, causing the high-voltage pulse signal to attenuate, so that the high-voltage trigger signal is lower than the trigger voltage when it reaches the pulse xenon lamp, and the xenon lamp cannot be reliably triggered to pre-ignite. Therefore, how to provide a reliable pulse xenon lamp pre-ignition circuit has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a pulse xenon lamp pre-ignition circuit to solve the problem in the prior art that a stable high-voltage pulse cannot be continuously output, and thus the xenon lamp pre-ignition cannot be reliably triggered under long cable transmission.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a pulse xenon lamp simmer circuit is provided, comprising: a simmer high-voltage module, wherein the simmer high-voltage module includes a boost circuit and a voltage doubler circuit, wherein an input end of the boost circuit is electrically connected to a first DC high-voltage power supply, and an output end of the boost circuit outputs a second DC high-voltage power supply and is electrically connected to an input end of the voltage doubler circuit;

[0007] The output end of the voltage multiplier circuit is electrically connected to the power supply end of the xenon lamp to continuously provide the xenon lamp with a pre-ignition high-voltage stable pulse power supply to trigger the xenon lamp to form a pre-ignition channel.

[0008] Based on the above-disclosed content, the pulse xenon lamp pre-ignition circuit provided by the present invention first performs a primary voltage boost on the xenon lamp high-voltage DC power supply through a voltage boost circuit, and then performs a secondary voltage boost on the xenon lamp high-voltage DC power supply through a voltage doubler circuit. At the same time, the voltage doubler circuit can also continuously maintain a stable output of high voltage during the secondary voltage boost process. In this way, the pre-ignition high-voltage module is enabled to output high voltage by using a voltage doubler circuit to trigger the pre-ignition of the xenon lamp, which can continuously provide a stable high-voltage pulse signal for the xenon lamp, thereby achieving reliable and stable triggering of the pre-ignition of the xenon lamp under long cable transmission, and solving the problem that the traditional xenon lamp pre-ignition circuit cannot reliably trigger the pre-ignition of the xenon lamp under long cable transmission. In addition, the use of a voltage doubler circuit to output high voltage to trigger the pre-ignition of the xenon lamp also reduces the number of transformers, thereby reducing the volume and cost of the pulse xenon lamp pre-ignition circuit, making it suitable for large-scale application and promotion.

[0009] In one possible design, the voltage doubling circuit includes: a first capacitor, a second capacitor, and three groups of diode units, wherein the three groups of diode units are connected in parallel in sequence, and each group of diode units includes a first diode, a second diode, and a third capacitor;

[0010] For any diode unit, the cathode of the first diode is electrically connected to the anode of the second diode, the cathode of the second diode is electrically connected to the anode of the first diode via the third capacitor, and a second capacitor is further connected in parallel between any two diode units in the three groups of diode units;

[0011] The cathode of the target diode is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to the second DC high-voltage power supply, wherein the target diode is the first diode in the first group of diode units among the three groups of diode units, and the anode of the second diode in the last group of diode units among the three groups of diode units is electrically connected to the power supply end of the xenon lamp through the first isolation diode, providing a pre-ignition high-voltage stable pulse power supply for the xenon lamp.

[0012] In one possible design, the boost circuit includes an IR2153S half-bridge driver chip, a first isolation transformer, a first MOS transistor, a second MOS transistor, and a first transformer;

[0013] The RT pin of the IR2153S half-bridge driver chip is electrically connected to one end of a first resistor, wherein the other end of the first resistor is electrically connected to the CT pin of the IR2153S half-bridge driver chip, and the CT pin of the IR2153S half-bridge driver chip is also grounded through a fourth capacitor;

[0014] The VCC pin of the IR2153S half-bridge driver chip is electrically connected to a first DC power supply, wherein the H0 pin and the LO pin of the IR2153S half-bridge driver chip are respectively electrically connected to the primary coil of the first isolation transformer, and the primary coil of the first isolation transformer is also electrically connected to the first DC high-voltage power supply;

[0015] The first isolation transformer is provided with two sets of secondary coils, wherein one end of the first secondary coil of the two secondary coils is electrically connected to the gate of the first MOS transistor through a second resistor, and the other end of the first secondary coil is electrically connected to the source of the first MOS transistor, the drain of the second MOS transistor, and one end of the primary coil of the first transformer, respectively, and the drain of the first MOS transistor is electrically connected to the first DC high-voltage power supply;

[0016] One end of the second secondary coil of the two secondary coils is electrically connected to the gate of the second MOS transistor via a third resistor, and the other end of the second secondary coil is respectively electrically connected to the source of the second MOS transistor, one end of a fifth capacitor, one end of a sixth capacitor, and one end of a seventh capacitor, wherein the other end of the fifth capacitor is respectively electrically connected to the source of the first MOS transistor and one end of the eighth capacitor, and the other end of the eighth capacitor and the other end of the sixth capacitor are respectively electrically connected to the first DC high-voltage power supply;

[0017] The other end of the seventh capacitor is electrically connected to the other end of the primary coil of the first transformer, wherein the secondary coil of the first transformer outputs the second DC high-voltage power supply and is electrically connected to the input end of the voltage doubling circuit.

[0018] In one possible design, the pulse xenon lamp pre-ignition circuit also includes: an LLC series resonance module, wherein the input end of the LLC series resonance module is electrically connected to the first DC high-voltage power supply, and the output end of the LLC series resonance module outputs the xenon lamp power supply and is electrically connected to the power supply end of the xenon lamp, so that when the xenon lamp forms a pre-ignition channel, the xenon lamp is lit by the xenon lamp power supply.

[0019] Based on the above-disclosed content, the present invention adopts LLC series resonant soft switching technology to realize the power supply of the xenon lamp. In this way, the switching loss of the MOS tube in the circuit can be reduced, which not only improves the pre-ignition efficiency but also effectively reduces the volume of the pulse xenon lamp pre-ignition power supply at the same power; at the same time, by adjusting the switching frequency of the LLC series resonant module, the pre-ignition current of the pulse xenon lamp pre-ignition circuit can be changed, so that the xenon lamp pre-ignition circuit can be suitable for pulse xenon lamps with different parameters, thereby improving the adaptability of the circuit.

[0020] In one possible design, the LLC series resonant module includes: an LLC series resonant control circuit and an LLC series resonant circuit, wherein the LLC series resonant control circuit is electrically connected to the controlled end of the LLC series resonant circuit, the input end of the LLC series resonant circuit is electrically connected to the first DC high-voltage power supply, and the output end of the LLC series resonant circuit outputs the xenon lamp power supply and is electrically connected to the power supply end of the xenon lamp.

[0021] In one possible design, the LLC series resonant circuit includes: a second isolation transformer, a third MOS transistor, a fourth MOS transistor, a ninth capacitor, a resonant inductor, and a second transformer;

[0022] A primary coil end of the second isolation transformer is electrically connected to an output end of the LLC series resonant control circuit, and the second isolation transformer is provided with two sets of secondary coils, wherein one end of a third secondary coil in the two sets of secondary coils is electrically connected to the gate of the third MOS transistor, and the other end of the third secondary coil is electrically connected to the source of the third MOS transistor, the drain of the fourth MOS transistor, and one end of the ninth capacitor through a fourth resistor, and one end of the ninth capacitor is electrically connected to one end of the primary coil of the second transformer through the resonant inductor;

[0023] One end of the fourth secondary coil in the two groups of secondary coils is electrically connected to the gate of the fourth MOS transistor, wherein the other end of the fourth secondary coil is electrically connected to the source of the fourth MOS transistor and the other end of the second transformer primary coil through a fifth resistor, and the second transformer secondary coil is electrically connected to the power supply end of the xenon lamp.

[0024] In one possible design, the LLC series resonant control circuit uses an SG3525A PWM control chip, wherein the output end of the LLC series resonant circuit is electrically connected to the input end of a first rectifier and filter circuit, and the output end of the first rectifier and filter circuit is electrically connected to the power supply end of the xenon lamp through a second isolation diode;

[0025] The first pin of the SG3525A PWM control chip is electrically connected to the anode of the second isolation diode, and the 11th pin and the 14th pin of the SG3525A PWM control chip are electrically connected to the primary coil of the second isolation transformer.

[0026] In one possible design, the pulse xenon lamp simmer circuit further includes: a simmer state detection circuit, wherein the simmer state detection circuit includes a current detection resistor, a photocoupler, and a fifth MOS transistor, and one end of the current detection resistor is electrically connected to the output end of the LLC series resonant module;

[0027] One end of the light source in the photoelectric coupler is electrically connected to one end of a sixth resistor, wherein the other end of the sixth resistor is electrically connected to the output end of the LLC series resonant module and one end of the current detection resistor, and the other end of the light source of the photoelectric coupler and the other end of the current detection resistor are grounded respectively;

[0028] One end of the light receiver in the photoelectric coupler is electrically connected to the first DC power supply through a seventh resistor, and the other end of the light receiver in the photoelectric coupler is electrically connected to the gate of the fifth MOS transistor through a third diode, wherein the drain of the fifth MOS transistor is electrically connected to the controlled end of the boost circuit, and the source of the fifth MOS transistor is grounded.

[0029] Based on the above disclosure, the present invention further provides a pre-ignition state detection circuit for a xenon lamp, wherein, when the xenon lamp is not pre-ignited and is turned on, there is no voltage across the current detection resistor in the pre-ignition state detection circuit. Therefore, the third diode in the pre-ignition state detection circuit has no output and the fifth MOS transistor is not turned on. At this time, the entire circuit provides a pre-ignition high-voltage stable pulse power supply for the xenon lamp through a boost circuit and a voltage doubler circuit. When the xenon lamp is turned on, that is, after the LLC series resonant module outputs the xenon lamp power supply, the xenon lamp current forms a voltage of about 5 to 6V across the current detection resistor after passing through the resistor. In this way, the photoelectric coupler can be turned on, thereby causing the third diode in the pre-ignition state detection circuit to output a voltage of 15V, thereby causing the fifth MOS transistor to be turned on, thereby outputting a signal to the IR2153S half-bridge driver chip in the boost circuit, and the driver chip stops the pre-ignition high-voltage module circuit. Through the above design, the pre-ignition high-voltage module can be automatically shut down, thereby improving the convenience of use.

[0030] In one possible design, the pulse xenon lamp pre-ignition circuit further includes: a voltage detection circuit, and the voltage detection circuit includes: an operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, and a transistor;

[0031] The non-inverting input terminal of the operational amplifier is electrically connected to one end of the eighth resistor, wherein one end of the eighth resistor is electrically connected to one end of the tenth resistor through the ninth resistor, and the other end of the tenth resistor is electrically connected to the output end of the LLC series resonant module;

[0032] The inverting input terminal of the operational amplifier is electrically connected to the resistance adjustment terminal of the sliding resistor and one end of the tenth capacitor, wherein one end of the sliding resistor is electrically connected to the first DC power supply, and the other end of the sliding resistor and the other end of the tenth capacitor are grounded respectively;

[0033] The output end of the operational amplifier is electrically connected to the base of the transistor, wherein the collector of the transistor is electrically connected to the gate of the fifth MOS transistor through a fourth diode, and the emitter of the transistor is grounded.

[0034] Based on the above disclosure, the present invention can detect the supply voltage of the xenon lamp in real time by providing a voltage detection circuit, thereby limiting the maximum supply voltage of the circuit and ensuring the safe operation of the xenon lamp.

[0035] In one possible design, the pulse xenon lamp pre-ignition circuit further includes: a second rectifier and filter circuit and a power supply circuit;

[0036] The input end of the second rectifier and filter circuit is electrically connected to 220V AC power, wherein the output end of the second rectifier and filter circuit outputs the first DC high-voltage power supply and is electrically connected to the input end of the LLC series resonant module and the input end of the boost circuit respectively;

[0037] The input end of the power supply circuit is electrically connected to a 220V AC power supply, wherein the output end of the power supply circuit outputs a first DC power supply and is electrically connected to a power supply end of the LLC series resonant control circuit.

[0038] Beneficial effects:

[0039] (1) The present invention uses a voltage doubling circuit to enable the pre-ignition high-voltage module to output high voltage to trigger the pre-ignition of the xenon lamp, which can continuously provide a stable high-voltage pulse signal for the xenon lamp, thereby realizing reliable and stable triggering of the pre-ignition of the xenon lamp under long cable transmission, and solving the problem that the traditional xenon lamp pre-ignition circuit cannot reliably trigger the pre-ignition of the xenon lamp under long cable transmission; in addition, the use of a voltage doubling circuit to output high voltage to trigger the pre-ignition of the xenon lamp also reduces the number of transformers, thereby reducing the volume and cost of the pulse xenon lamp pre-ignition circuit, and is suitable for large-scale application and promotion.

[0040] (2) The present invention adopts LLC series resonant soft switching technology to realize the power supply of xenon lamp, so that the switching loss of MOS tube in the circuit can be reduced, which not only improves the pre-ignition efficiency, but also effectively reduces the volume of the pulse xenon lamp pre-ignition power supply at the same power; at the same time, by adjusting the switching frequency of the LLC series resonant module, the pre-ignition current of the pulse xenon lamp pre-ignition circuit can be changed, so that the xenon lamp pre-ignition circuit can be suitable for pulse xenon lamps with different parameters, thereby improving the adaptability of the circuit.

[0041] (3) The present invention is provided with a pre-combustion state detection circuit, which can control the operation of the pre-combustion high-voltage module by determining whether the LLC series resonant module outputs the xenon lamp power supply. In this way, the pre-combustion high-voltage module can be automatically controlled, thereby improving the convenience of use.

[0042] (4) The present invention can detect the power supply voltage of the xenon lamp in real time by setting a voltage detection circuit. In this way, the maximum power supply voltage of the circuit can be limited, thereby ensuring the safe operation of the xenon lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A circuit block diagram of a pulsed xenon lamp simmer circuit provided in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the overall circuit of a pulse xenon lamp pre-ignition circuit provided in an embodiment of the present invention;

[0045] Figure 3 A specific circuit diagram of a pre-ignition high-voltage module provided in an embodiment of the present invention;

[0046] Figure 4 A specific circuit diagram of the xenon lamp interface provided in an embodiment of the present invention;

[0047] Figure 5 A specific circuit diagram of an LLC series resonant control circuit provided by an embodiment of the present invention;

[0048] Figure 6 A specific circuit diagram of an LLC series resonant circuit provided by an embodiment of the present invention;

[0049] Figure 7 A specific circuit diagram of a first rectifier and filter circuit provided in an embodiment of the present invention;

[0050] Figure 8 A specific circuit diagram of a pre-ignition state detection circuit provided in an embodiment of the present invention;

[0051] Figure 9 A specific circuit diagram of a voltage detection circuit provided by an embodiment of the present invention;

[0052] Figure 10 This is a specific circuit diagram of the second rectifier and filter circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0054] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element without departing from the scope of the exemplary embodiments of the present invention.

[0055] It should be understood that the term "and / or" that may appear in this document is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may indicate three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" that may appear in this document describes another type of association object relationship, indicating that two relationships may exist. For example, A / and B may indicate two situations: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0056] Example:

[0057] See also Figures 1 to 4 As shown, the pulse xenon lamp pre-ignition circuit provided in this embodiment may include, but is not limited to, a pre-ignition high-voltage module. In a specific implementation, the pre-ignition high-voltage module may include, but is not limited to, a boost circuit and a voltage doubler circuit, wherein the input end of the boost circuit is electrically connected to a first DC high-voltage power supply (e.g., a 300V DC high-voltage power supply obtained by boosting 220V AC power), and the output end of the boost circuit outputs a second DC high-voltage power supply and is electrically connected to the input end of the voltage doubler circuit. In this way, the boost circuit is used to perform a primary boost on the input voltage. At the same time, the power supply after the primary boost is secondary boosted by the voltage doubler circuit to obtain the high-voltage pulse signal required for pre-ignition of the xenon lamp. That is, the output end of the voltage doubler circuit is electrically connected to the power supply end of the xenon lamp, continuously providing the xenon lamp with a stable pre-ignition high-voltage pulse power supply to trigger the xenon lamp to form a pre-ignition channel. In this way, the voltage doubler circuit is used to achieve a secondary boost on the input voltage without adding an additional transformer, and continuously and stably outputs the boosted voltage, thereby continuously providing a stable high-voltage pulse signal for pre-ignition of the xenon lamp.

[0058] Therefore, the pulse xenon lamp pre-ignition circuit provided in this embodiment only requires one transformer to obtain the high-voltage pulse signal required for xenon lamp pre-ignition. At the same time, the use of voltage doubling can ensure the continuous and stable output of the high-voltage pulse signal. In this way, the problem that the pulse xenon lamp pre-ignition circuit cannot continuously and stably output the high-voltage pulse signal can be avoided, and reliable and stable pre-ignition of the xenon lamp can be achieved under long cable transmission.

[0059] See also Figure 3As shown, the following provides one specific structure of the pre-combustion high-pressure module, as shown below:

[0060] In this embodiment, the boost circuit may include, but is not limited to: an IR2153S half-bridge driver chip N1, a first isolation transformer T2, a first MOS transistor V2, a second MOS transistor V3, and a first transformer T1; wherein the RT pin of the IR2153S half-bridge driver chip N1 is electrically connected to one end of the first resistor R2, the other end of the first resistor R2 is electrically connected to the CT pin of the IR2153S half-bridge driver chip N1, and the CT pin of the IR2153S half-bridge driver chip N1 is also grounded through a fourth capacitor C14; at the same time, the IR2153S half-bridge driver chip The VCC pin of the chip N1 is electrically connected to a first DC power supply (which may be, but is not limited to, a 15V DC power supply), and the H0 pin and LO pin of the IR2153S half-bridge driver chip N1 are respectively electrically connected to the primary coil of the first isolation transformer T2, and the primary coil of the first isolation transformer T2 is also electrically connected to the first DC high-voltage power supply; in this embodiment, the IR2153S half-bridge driver chip N1 serves as the control end of the entire pre-ignition high-voltage module, which is used to control whether the pre-ignition high-voltage module can perform a boost operation, that is, whether to perform a boost operation is determined by the voltage signals input to the CT pin and the RT pin.

[0061] For further information, see Figure 3 As shown, for example, the first isolation transformer T2 is provided with two sets of secondary coils, wherein one end of the first secondary coil of the two secondary coils is electrically connected to the gate of the first MOS transistor V2 through the second resistor R4, and the other end of the first secondary coil is electrically connected to the source of the first MOS transistor V2, the drain of the second MOS transistor V3 and one end of the primary coil of the first transformer T1, and the drain of the first MOS transistor V2 is electrically connected to the first DC high-voltage power supply; similarly, one end of the second secondary coil of the two secondary coils is electrically connected to the gate of the second MOS transistor V3 through the third resistor R5, and the other end of the second secondary coil is electrically connected to the gate of the second MOS transistor V3. The first and second capacitors C8 are electrically connected to the source of the second MOS transistor V3, one end of the fifth capacitor C6, one end of the sixth capacitor C9, and one end of the seventh capacitor C8, respectively. The other end of the fifth capacitor C6 is electrically connected to the source of the first MOS transistor V2 and one end of the eighth capacitor C5, respectively. The other end of the eighth capacitor C5 and the other end of the sixth capacitor C9 are electrically connected to the first DC high-voltage power supply, respectively. In addition, the other end of the seventh capacitor C8 is electrically connected to the other end of the primary coil of the first transformer T1. The secondary coil of the first transformer T1 outputs the second DC high-voltage power supply and is electrically connected to the input end of the voltage doubling circuit.

[0062] Through the above detailed description of the boost circuit, this embodiment is equivalent to using the boost circuit composed of the IR2153S half-bridge driver chip N1, the isolation transformer T2, the first MOS transistor V2, the second MOS transistor V3 and the first transformer T1 to achieve the first boost of the input voltage (i.e., the first DC high-voltage power supply). Then, the input voltage after the first boost can be input into the voltage doubling circuit for a second boost to obtain a high-voltage pulse signal that meets the xenon lamp pre-ignition requirement.

[0063] See also Figure 3 As shown, for example, the voltage doubling circuit may include, but is not limited to: a first capacitor C10, a second capacitor, and three groups of diode units, wherein the three groups of diode units are sequentially connected in parallel, and each group of diode units includes a first diode, a second diode, and a third capacitor; see Figure 3 As shown, the first diode unit includes a first diode D1, a second diode D2 and a third capacitor C12, the second diode unit includes a first diode D3, a second diode D4 and a third capacitor C14, and the third diode unit includes a first diode D5, a second diode D6 and a third capacitor C16.

[0064] See also Figure 3 As shown, since the circuit structure of each group of diode units is the same, the circuit structure is explained below by taking any diode unit as an example, wherein, for any diode unit, the cathode of the first diode is electrically connected to the anode of the second diode, and the cathode of the second diode is electrically connected to the anode of the first diode through the third capacitor; at the same time, in this embodiment, a second capacitor is connected in parallel between any two groups of diode units in the three groups of diode units, that is, a second capacitor C13 is connected in parallel between the first diode unit and the second diode unit, and a second capacitor C15 is connected in parallel between the second diode unit and the third diode unit; further, for the first diode unit and the second diode unit, the second capacitor C13 can be, but is not limited to, provided between the anode of the second diode D2 and the cathode of the first diode D3.

[0065] Also, see Figure 3 As shown, the cathode of the target diode is electrically connected to one end of the first capacitor C10, and the other end of the first capacitor is electrically connected to the second DC high-voltage power supply, wherein the target diode is the first diode in the first group of diode units in the three groups of diode units, and the anode of the second diode in the last group of diode units in the three groups of diode units is electrically connected to the power supply end of the xenon lamp through the first isolation diode D10, providing a pre-ignition high-voltage stable pulse power supply for the xenon lamp.

[0066] Through the above detailed circuit description of the voltage doubling circuit, this embodiment can utilize the voltage doubling circuit composed of the first capacitor, the second capacitor, the third capacitor, and multiple diode units to achieve a continuous high-voltage output of up to 15kV; thereby, the output voltage can reach the voltage level required for xenon lamp pre-ignition, and its continuous and stable output can also be guaranteed, thereby avoiding the problem of energy loss caused by long cable transmission.

[0067] In this embodiment, a xenon lamp interface is provided between the pre-ignition high-voltage module and the xenon lamp. The specific connection circuits of the boost circuit and the voltage multiplier circuit in the pre-ignition high-voltage module and the xenon lamp interface can be found in FIG. Figure 3 and Figure 4 As shown, no further details are given here.

[0068] See also Figures 5 to 10 As shown, the following provides a more abundant peripheral circuit for the pulse xenon lamp pre-ignition circuit to achieve more diverse functions of the pulse xenon lamp pre-ignition circuit.

[0069] In this embodiment, the pulse xenon lamp pre-ignition circuit may also include, but is not limited to, an LLC series resonant module, a pre-ignition state detection circuit, and a voltage detection circuit. In this way, the aforementioned circuits can be used to implement xenon lamp lighting control, automatic control of the pre-ignition high-voltage module operation, and detection of the xenon lamp power supply voltage, thereby ensuring stable and reliable operation of the xenon lamp.

[0070] First, in this embodiment, the input end of the LLC series resonant module is electrically connected to the first DC high-voltage power supply, and the output end of the LLC series resonant module outputs the xenon lamp power supply and is electrically connected to the power supply end of the xenon lamp, so that when the xenon lamp forms a pre-ignition channel, the xenon lamp is illuminated by the xenon lamp power supply; in this way, the LLC series resonant soft switching technology can be used to realize the power supply of the xenon lamp, thereby reducing switching losses.

[0071] Optionally, for example, the LLC series resonant module may include, but is not limited to: an LLC series resonant control circuit and an LLC series resonant circuit, wherein the LLC series resonant control circuit is electrically connected to the controlled end of the LLC series resonant circuit, for controlling the operation of the LLC series resonant circuit; at the same time, the input end of the LLC series resonant circuit is electrically connected to the first DC high-voltage power supply, and the output end of the LLC series resonant circuit outputs the xenon lamp power supply and is electrically connected to the power supply end of the xenon lamp; in this way, it is equivalent to using the voltage output by the LLC series resonant circuit as the power supply circuit of the xenon lamp, thereby turning on the xenon lamp when the xenon lamp pre-ignition is triggered to achieve lighting of the xenon lamp.

[0072] See also Figure 5 and Figure 6As shown, the following provides one specific circuit structure of the LLC series resonant module, as shown below:

[0073] In this embodiment, the LLC series resonant control circuit may, for example, be but not limited to using the SG3525A PWM control chip U1, and the LLC series resonant circuit may, for example, be but not limited to including: a second isolation transformer T4, a third MOS transistor U3, a fourth MOS transistor U4, a ninth capacitor C16, a resonant inductor L7, and a second transformer T5. The specific connection structure of the aforementioned electronic components is as follows:

[0074] See also Figure 5 and Figure 6 As shown, the 11th and 14th pins of the SG3525A PWM control chip U1 are electrically connected to the primary coil of the second isolation transformer T4. At the same time, for example, the second isolation transformer T4 is also provided with two sets of secondary coils, wherein one end of the third secondary coil in the two sets of secondary coils is electrically connected to the gate of the third MOS transistor U3, and the other end of the third secondary coil is electrically connected to the source of the third MOS transistor U3, the drain of the fourth MOS transistor U4 and one end of the ninth capacitor C16 through the fourth resistor R20, and one end of the ninth capacitor C16 is electrically connected to one end of the primary coil of the second transformer T5 through the resonant inductor L7.

[0075] Similarly, for the fourth secondary coil in the two sets of secondary coils, one end of the fourth secondary coil is electrically connected to the gate of the fourth MOS transistor U4, and the other end of the fourth secondary coil is electrically connected to the source of the fourth MOS transistor U4 and the other end of the primary coil of the second transformer T5 through the fifth resistor R21, and the secondary coil of the second transformer T5 is electrically connected to the power supply end of the xenon lamp.

[0076] In this way, after the first DC high-voltage power supply is input into the LLC series resonant module, the internal LLC series resonant control circuit outputs two PWM signals in opposite directions through the second isolation transformer T4 in the LLC series resonant circuit to respectively control the operation of the third MOS transistor U3 and the fourth MOS transistor U4. The first DC high-voltage power supply realizes lossless output of the voltage switch through the switching circuit composed of the third MOS transistor U3 and the fourth MOS transistor U4, and the series resonant circuit composed of the ninth capacitor C16, the resonant inductor L1 and the primary coil of the second transformer T5, that is, outputs a sinusoidal wave voltage through the secondary coil of the second transformer T5, thereby powering the xenon lamp.

[0077] In this embodiment, for example, the output end of the LLC series resonant circuit is electrically connected to the input end of the first rectifier and filter circuit, wherein the output end of the first rectifier and filter circuit is electrically connected to the power supply end of the xenon lamp through the second isolation diode D9, and the first pin of the SG3525A PWM control chip U1 is electrically connected to the positive electrode of the second isolation diode D9; in this way, the high-frequency AC voltage can be rectified and filtered through the first rectifier and filter circuit, thereby obtaining a relatively smooth DC output, thereby realizing stable power supply for the xenon lamp.

[0078] See also Figure 7 As shown, the first rectifier and filter circuit may include, but is not limited to, a diode D20, a diode D21, a diode D22, a diode D23, and a capacitor C18. In a specific implementation, the anode of the diode D20 and the cathode of the diode D21 are electrically connected to one end of the secondary coil of the second transformer T5, and the anode of the diode D22 and the cathode of the diode D23 are electrically connected to the other end of the secondary coil of the second transformer T5. The cathode of the diode D20 is electrically connected to one end of the capacitor C18 and the anode of the second isolation diode D9, respectively, and the cathode of the diode D22 is electrically connected to the cathode of the diode D20. The anode of the diode D21 and the anode of the diode D23 are grounded via the current detection resistor R22.

[0079] Therefore, through the above detailed explanation of the LLC series resonant module circuit structure, the present invention adopts LLC series resonant soft switching technology to realize the power supply of the xenon lamp, so that the switching loss of the MOS tube in the circuit can be reduced, which not only improves the pre-ignition efficiency, but also effectively reduces the volume of the pulse xenon lamp pre-ignition power supply at the same power; at the same time, by adjusting the switching frequency of the LLC series resonant module, the pre-ignition current of the pulse xenon lamp pre-ignition circuit can be changed, so that the xenon lamp pre-ignition circuit can be suitable for pulse xenon lamps with different parameters, thereby improving the adaptability of the circuit.

[0080] Next, one of the specific circuit structures of the pre-ignition state detection circuit is described:

[0081] In this embodiment, the pre-ignition state detection circuit may include, but is not limited to: a current detection resistor R22, a photocoupler U2 and a fifth MOS transistor V4; see Figure 8 As shown, one end of the current detection resistor R22 is electrically connected to the output end of the LLC series resonant module (specifically, the other end of the secondary coil of the second transformer T5. Of course, when a first rectifier and filter circuit is provided, it is electrically connected to the anode of the diode D21 and the anode of the diode D23).

[0082] Furthermore, one end of the light source in the photoelectric coupler U2 is electrically connected to one end of the sixth resistor R9, wherein the other end of the sixth resistor R9 is respectively electrically connected to the output end of the LLC series resonant module and one end of the current detection resistor R22, and the other end of the light source of the photoelectric coupler U2 and the other end of the current detection resistor R22 are respectively grounded; at the same time, one end of the light receiver in the photoelectric coupler U2 is electrically connected to the first DC power supply through the seventh resistor R10, and the other end of the light receiver in the photoelectric coupler U2 is electrically connected to the gate of the fifth MOS transistor V4 through the third diode V8, and the drain of the fifth MOS transistor V4 is electrically connected to the controlled end of the boost circuit (which may be but is not limited to the third pin of the xenon lamp interface J1, which is actually connected to the CT pin and RT pin of the IR2153S half-bridge driver chip N1), and the source of the fifth MOS transistor V4 is grounded.

[0083] Of course, in this embodiment, the photocoupler U2 is also provided with its corresponding peripheral circuits, such as a capacitor C12 connected in parallel at both ends of the light source, and the other end of the light receiver is also electrically connected to one end of the capacitor C10 and one end of the resistor R8, and the other end of the capacitor C10 and the other end of the resistor R8 are grounded respectively. Figure 8 shown.

[0084] Therefore, the working principle of the aforementioned pre-ignition state detection circuit is as follows: when the xenon lamp is not pre-ignited and is turned on, there is no voltage across the current detection resistor R22 in the pre-ignition state detection circuit. Therefore, the third diode V8 of the pre-ignition state detection circuit has no output and the fifth MOS tube V4 is not turned on. At this time, the entire pulse xenon lamp pre-ignition circuit will provide the xenon lamp with a pre-ignition high-voltage stable pulse power supply through the pre-ignition high-voltage module; and when the xenon lamp is turned on and lit, that is, after the LLC series resonant circuit outputs the xenon lamp power supply, the xenon lamp current forms a voltage of about 5 to 6V across the current detection resistor R22. In this way, the optocoupler U2 can be turned on, thereby causing the third diode V8 in the pre-ignition state detection circuit to output a 15V voltage, and then causing the fifth MOS tube V4 to be turned on, so as to finally output a signal to the IR2153S half-bridge driver chip in the boost circuit, and the pre-ignition high-voltage module circuit stops working through the driver chip. Based on the above explanation, automatic control of the pre-ignition high-voltage module can be achieved, thereby improving the convenience of use.

[0085] Finally, one of the circuit structures of the voltage detection circuit is provided as follows:

[0086] In this embodiment, the voltage detection circuit may include, but is not limited to, an operational amplifier N3, an eighth resistor R11, a ninth resistor R12, a tenth resistor R13, and a transistor Q1. The specific connection structure of the aforementioned electronic components is as follows:

[0087] See also Figure 9 As shown, the non-inverting input terminal of the operational amplifier N3 is electrically connected to one end of the eighth resistor R11, wherein one end of the eighth resistor R11 is electrically connected to one end of the tenth resistor R13 through the ninth resistor R12, and the other end of the tenth resistor R13 is electrically connected to the output end of the LLC series resonant module (which may be but is not limited to the positive electrode of the second isolation diode D9). At the same time, the inverting input terminal of the operational amplifier N3 is respectively electrically connected to the resistance adjustment end of the sliding resistor RP1 and one end of the tenth capacitor C2, one end of the sliding resistor RP1 is electrically connected to the first DC power supply, and the other end of the sliding resistor RP1 and the other end of the tenth capacitor C2 are respectively grounded; further, the output terminal of the operational amplifier N3 is electrically connected to the base of the transistor Q1, the collector of the transistor Q1 is electrically connected to the gate of the fifth MOS transistor V4 through the fourth diode V7, and the emitter of the transistor Q1 is grounded.

[0088] The principle of the aforementioned voltage detection circuit is: the output voltage of the LLC series resonant circuit is sampled through a voltage-divider resistor network composed of the eighth resistor R11, the ninth resistor R12 and the tenth resistor R13. At the same time, the sampled voltage is detected by the operational amplifier N3. In this way, the maximum supply voltage of the xenon lamp can be limited, thereby preventing the xenon lamp from being damaged by high voltage and achieving the purpose of ensuring the stable operation of the xenon lamp.

[0089] In addition, in this embodiment, a second rectifier and filter circuit and a power supply circuit are also provided; in specific implementation, the input end of the second rectifier and filter circuit is electrically connected to a 220V AC power supply, wherein the output end of the second rectifier and filter circuit outputs the first DC high-voltage power supply, and is respectively electrically connected to the input end of the LLC series resonant module and the input end of the boost circuit; in this way, a relatively smooth high-voltage DC input can be provided for the entire pulse xenon lamp pre-ignition circuit.

[0090] See also Figure 10 As shown, the second rectifier and filter circuit may include, but is not limited to, a rectifier bridge V1, a resistor R32, a resistor R19, and an electrolytic capacitor C15, wherein the input end of the rectifier bridge V1 is electrically connected to a 220V AC power supply, the output end of the rectifier bridge V1 is electrically connected to the input end of the boost circuit and the LLC series resonant circuit, and an electrolytic capacitor C15 and a target resistor are further connected in parallel between the two output ends of the rectifier bridge V1, and the target resistor is formed by connecting the resistor R32 and the resistor R19 in series.

[0091] At the same time, the input end of the power supply circuit is also electrically connected to a 220V AC power supply, and the output end of the power supply circuit outputs a first DC power supply, and is respectively electrically connected to the power supply end of the LLC series resonant control circuit (i.e., the power supply end of the SG3525A PWM control chip U1) and the power supply end of the IR2153S half-bridge driver chip N1 (i.e., the VCC pin of the IR2153S half-bridge driver chip N1); in this way, the chip power supply voltage can be provided to the aforementioned two chips, thereby ensuring the normal operation of the chip.

[0092] In addition, for example, the first isolation diode D10 and the second isolation diode D9 are both high-voltage diodes, whose withstand voltage needs to be greater than 15kV, and the current carrying capacity can be selected in a suitable range according to the simmer current of the xenon lamp simmer pulse circuit.

[0093] Thus, through the above explanation, the working principle of the present invention is:

[0094] The 220V AC input voltage is converted into a 300V DC voltage by the second rectifier and filter circuit and input into the LLC series resonant circuit and pre-ignition high-voltage module circuit respectively. The LLC series resonant control circuit outputs two opposite PWM signals through the second isolation transformer T4 in the LLC series resonant circuit to control the operation of the third MOS transistor U3 and the fourth MOS transistor U4 respectively. The 300V DC voltage is output through the switching circuit composed of the third and fourth MOS transistors U3 and U4, as well as the series resonant circuit composed of the resonant capacitor C16, the resonant inductor L1, and the primary coil of the second transformer T5 to achieve the output of the supply voltage. The secondary coil of the second transformer T5 outputs a sinusoidal wave voltage. This sinusoidal wave voltage is rectified by the first rectifier and filter circuit to output the DC voltage V1, which is output to the xenon lamp through the isolation diode D9 to power the xenon lamp.

[0095] When the xenon lamp is not pre-ignited and is turned on, there is no voltage across the current detection resistor R22. Therefore, the third diode V8 has no output and the fifth MOS transistor V4 is not turned on. At this time, the boost circuit consisting of the IR2153S half-bridge driver chip N1, the isolation transformer T2, the first MOS transistor V2, the second MOS transistor V3, and the first transformer T1 is used to achieve the first boost of the input voltage (i.e., the first DC high-voltage power supply). Then, the voltage doubling circuit consisting of the first capacitor, the second capacitor, the third capacitor, and multiple diode units is used to achieve a continuous high-voltage output of up to 15kV, thereby triggering the xenon lamp to form a pre-ignition channel. Once the pre-ignition channel is formed, the xenon lamp will be turned on based on the output voltage of the LLC series resonant circuit and a stable current will be provided to the xenon lamp, thereby lighting the xenon lamp.

[0096] When the xenon lamp is turned on, the xenon lamp current forms a voltage of about 5 to 6V across the current detection resistor R22 after passing through it. This turns on the photocoupler U2, causing the third diode V8 in the pre-ignition state detection circuit to output a 15V voltage, which in turn turns on the fifth MOS transistor V4, ultimately outputting a signal to the IR2153S half-bridge driver chip in the boost circuit. The driver chip then stops the pre-ignition high-voltage module circuit from operating.

[0097] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A pulse xenon lamp simmer circuit, characterized in that: include: The pre-ignition high-voltage module includes a boost circuit and a voltage multiplier circuit; The output end of the voltage multiplier circuit is electrically connected to the power supply end of the xenon lamp to continuously provide the xenon lamp with a pre-ignition high-voltage stable pulse power supply to trigger the xenon lamp to form a pre-ignition channel; The boost circuit includes an IR2153S half-bridge driver chip, a first isolation transformer, a first MOS transistor, a second MOS transistor, and a first transformer; The RT pin of the IR2153S half-bridge driver chip is electrically connected to one end of the first resistor, wherein the other end of the first resistor is electrically connected to the CT pin of the IR2153S half-bridge driver chip, and the CT pin of the IR2153S half-bridge driver chip is also grounded through a fourth capacitor; The VCC pin of the IR2153S half-bridge driver chip is electrically connected to the first DC power supply, wherein the H0 pin and LO pin of the IR2153S half-bridge driver chip are respectively electrically connected to the primary coil of the first isolation transformer, and the primary coil of the first isolation transformer is also electrically connected to the first DC high-voltage power supply; The first isolation transformer is provided with two sets of secondary coils, wherein one end of the first secondary coil of the two secondary coils is electrically connected to the gate of the first MOS transistor through the second resistor, and the other end of the first secondary coil is electrically connected to the source of the first MOS transistor, the drain of the second MOS transistor, and one end of the primary coil of the first transformer, and the drain of the first MOS transistor is electrically connected to the first DC high-voltage power supply; One end of the second secondary coil of the two secondary coils is electrically connected to the gate of the second MOS transistor via the third resistor, and the other end of the second secondary coil is electrically connected to the source of the second MOS transistor, one end of the fifth capacitor, one end of the sixth capacitor, and one end of the seventh capacitor, respectively. The other end of the fifth capacitor is electrically connected to the source of the first MOS transistor and one end of the eighth capacitor, respectively. The other end of the eighth capacitor and the other end of the sixth capacitor are electrically connected to the first DC high-voltage power supply, respectively. The other end of the seventh capacitor is electrically connected to the other end of the primary coil of the first transformer, wherein the secondary coil of the first transformer outputs a second DC high-voltage power supply and is electrically connected to the input end of the voltage doubling circuit.

2. A pulse xenon lamp simmering circuit according to claim 1, characterized in that: The voltage doubling circuit includes: a first capacitor, a second capacitor, and three groups of diode units, wherein the three groups of diode units are connected in parallel in sequence, and each group of diode units includes a first diode, a second diode, and a third capacitor; For any diode unit, the cathode of the first diode is electrically connected to the anode of the second diode, the cathode of the second diode is electrically connected to the anode of the first diode via a third capacitor, and a second capacitor is connected in parallel between any two diode units in the three groups of diode units; The cathode of the target diode is electrically connected to one end of the first capacitor, and the other end of the first capacitor is electrically connected to the second DC high-voltage power supply, wherein the target diode is the first diode in the first group of diode units among the three groups of diode units, and the anode of the second diode in the last group of diode units among the three groups of diode units is electrically connected to the power supply end of the xenon lamp through the first isolation diode, providing a pre-ignition high-voltage stable pulse power supply for the xenon lamp.

3. The pulse xenon lamp simmering circuit according to claim 1, characterized in that: The pulse xenon lamp pre-ignition circuit also includes: an LLC series resonance module, wherein the input end of the LLC series resonance module is electrically connected to the first DC high-voltage power supply, and the output end of the LLC series resonance module outputs the xenon lamp power supply and is electrically connected to the power supply end of the xenon lamp, so that when the xenon lamp forms a pre-ignition channel, the xenon lamp is illuminated by the xenon lamp power supply.

4. A pulse xenon lamp simmering circuit according to claim 3, characterized in that: The LLC series resonant module includes: an LLC series resonant control circuit and an LLC series resonant circuit, wherein the LLC series resonant control circuit is electrically connected to the controlled end of the LLC series resonant circuit, the input end of the LLC series resonant circuit is electrically connected to a first DC high-voltage power supply, and the output end of the LLC series resonant circuit outputs a xenon lamp power supply and is electrically connected to the power supply end of the xenon lamp.

5. A pulse xenon lamp simmering circuit according to claim 4, characterized in that: The LLC series resonant circuit includes: a second isolation transformer, a third MOS transistor, a fourth MOS transistor, a ninth capacitor, a resonant inductor, and a second transformer; A primary coil end of the second isolation transformer is electrically connected to an output end of the LLC series resonant control circuit, and the second isolation transformer is provided with two sets of secondary coils, wherein one end of a third secondary coil in the two sets of secondary coils is electrically connected to the gate of the third MOS transistor, and the other end of the third secondary coil is electrically connected to the source of the third MOS transistor, the drain of the fourth MOS transistor, and one end of a ninth capacitor through a fourth resistor, and one end of the ninth capacitor is electrically connected to one end of the primary coil of the second transformer through a resonant inductor; One end of the fourth secondary coil in the two sets of secondary coils is electrically connected to the gate of the fourth MOS transistor, wherein the other end of the fourth secondary coil is electrically connected to the source of the fourth MOS transistor and the other end of the primary coil of the second transformer through a fifth resistor, and the secondary coil of the second transformer is electrically connected to the power supply end of the xenon lamp.

6. A pulse xenon lamp simmering circuit according to claim 5, characterized in that: The LLC series resonant control circuit adopts the SG3525A PWM control chip, wherein the output end of the LLC series resonant circuit is electrically connected to the input end of the first rectifier and filter circuit, and the output end of the first rectifier and filter circuit is electrically connected to the power supply end of the xenon lamp through the second isolation diode; The first pin of the SG3525A PWM control chip is electrically connected to the anode of the second isolation diode, and the 11th pin and the 14th pin of the SG3525A PWM control chip are electrically connected to the primary coil of the second isolation transformer.

7. The pulse xenon lamp simmering circuit according to claim 3, characterized in that: The pulse xenon lamp simmer circuit further includes: a simmer state detection circuit, wherein the simmer state detection circuit includes a current detection resistor, a photocoupler and a fifth MOS tube, and one end of the current detection resistor is electrically connected to the output end of the LLC series resonant module; One end of the light source in the photoelectric coupler is electrically connected to one end of a sixth resistor, wherein the other end of the sixth resistor is electrically connected to the output end of the LLC series resonant module and one end of the current detection resistor, and the other end of the light source of the photoelectric coupler and the other end of the current detection resistor are grounded respectively; One end of the light receiver in the photoelectric coupler is electrically connected to the first DC power supply through the seventh resistor, and the other end of the light receiver in the photoelectric coupler is electrically connected to the gate of the fifth MOS tube through the third diode, wherein the drain of the fifth MOS tube is electrically connected to the controlled end of the boost circuit, and the source of the fifth MOS tube is grounded.

8. The pulse xenon lamp simmering circuit according to claim 7, characterized in that: The pulse xenon lamp pre-ignition circuit further includes: a voltage detection circuit, and the voltage detection circuit includes: an operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor and a transistor; A non-inverting input terminal of the operational amplifier is electrically connected to one end of an eighth resistor, wherein one end of the eighth resistor is electrically connected to one end of a tenth resistor via a ninth resistor, and the other end of the tenth resistor is electrically connected to the output terminal of the LLC series resonant module; The inverting input terminal of the operational amplifier is electrically connected to the resistance adjustment terminal of the sliding resistor and one end of the tenth capacitor, wherein one end of the sliding resistor is electrically connected to the first DC power supply, and the other end of the sliding resistor and the other end of the tenth capacitor are grounded respectively; The output end of the operational amplifier is electrically connected to the base of the transistor, wherein the collector of the transistor is electrically connected to the gate of the fifth MOS transistor through the fourth diode, and the emitter of the transistor is grounded.

9. The pulse xenon lamp simmering circuit according to claim 4, characterized in that: The pulse xenon lamp pre-ignition circuit further includes: a second rectifier and filter circuit and a power supply circuit; The input end of the second rectifier and filter circuit is electrically connected to 220V AC power, wherein the output end of the second rectifier and filter circuit outputs the first DC high-voltage power supply and is electrically connected to the input end of the LLC series resonant module and the input end of the boost circuit respectively; The input end of the power supply circuit is electrically connected to a 220V AC power supply, wherein the output end of the power supply circuit outputs a first DC power supply and is electrically connected to a power supply end of the LLC series resonant control circuit.

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