Pockels cell high-voltage power supply with double transformers connected in parallel

Abstract

The invention provides a Pockels cell high-voltage power supply with double transformers connected in parallel, and the power supply comprises a DC input power supply which provides DC voltage power supply for the power supply; the half-bridge driving circuit is used for driving the MOS tube, so that the transformer works; the LLC resonant network realizes soft switching of the circuit under resonant frequency, and reduces electromagnetic interference and heat loss; the double transformers are used for boosting, and voltage boosting is achieved through the turns ratio of the transformers and resonance amplification; a rectifying circuit that rectifies the high-frequency AC to a DC high voltage; and the feedback circuit adopts closed-loop control, monitors the output voltage and current, and feeds back the output voltage and current to the PWM controller at the input side to adjust the duty ratio or the frequency. Through the parallel connection of the double power supplies, the output power is increased, and larger power is provided for the Pockels cell modulator so as to realize higher repetition frequency requirements.

Description

Technical Field

[0001] This invention relates to the field of Pockel box drive technology, and in particular to a Pockel box high-voltage power supply with two transformers connected in parallel. Background Technology

[0002] A Pockel cell is a high-speed optical modulator based on the electro-optic effect. Its core principle utilizes the refractive index change of a crystal (such as barium metaborate, BBO) under an applied electric field—the Pockel effect—to modulate the phase, polarization, or intensity of a laser beam. The driving technology requires high voltage (typically in the kilovolt range) to generate a significant electro-optic effect and demands a fast response to match the crystal's electro-optic response time (nanosecond range). The driving circuit typically includes a high-voltage power supply and a high-voltage pulse modulator, and must address issues such as high-voltage insulation, signal delay, and capacitive load. To achieve high-speed, high-frequency, and high-voltage modulation, the driving system needs a high-power high-voltage power supply. Currently, high-voltage power supplies generally have low power output, failing to meet the application requirements of high-speed, high-repetition-rate (PRF) applications. Summary of the Invention

[0003] Therefore, it is necessary to address the problems mentioned in the background technology above by providing a Pockel box high-voltage power supply with two transformers in parallel, which can improve the output power.

[0004] To achieve the above and other related objectives, this application includes: The feedback circuit is used to acquire the output voltage and current of a transformer and provide the feedback voltage and current signals to the half-bridge circuit. The half-bridge circuit and LLC resonant topology network are used to generate PWM signals to drive the half-bridge MOS circuit. Through the turns ratio of the parallel transformer and resonant amplification, the voltage is boosted to generate two high-voltage AC signals. A rectifier circuit is used to rectify the high-voltage AC signal to obtain a high-voltage DC signal; The output circuit is used to connect the high-voltage DC signal in parallel for output.

[0005] In one embodiment, the entire power supply is powered by an external low-voltage DC power source.

[0006] In one embodiment, the feedback circuit provides feedback output of high voltage and current, which is used as a basis for the control signal of the half-bridge circuit, and can also be used as a reference for an external controller.

[0007] In one embodiment, the primary coils of two transformers are driven by an LLC resonant network to boost an external low-voltage DC power supply to a high-voltage AC signal.

[0008] In one embodiment, a high-voltage AC signal is rectified into a high-voltage DC signal by a rectifier circuit, and a high-voltage capacitor is used to remove the harmonic components of the high-voltage DC signal.

[0009] In one embodiment, the output circuit includes parallel output of the high-voltage DC signals from the two transformers of the two high-voltage power supplies, thereby increasing the total output power.

[0010] The Pockel box high-voltage power supply with dual transformers in parallel according to the present invention can provide high-efficiency and high-power high-voltage power output for use by the Pockel box high-voltage pulse modulation module. Attached Figure Description

[0011] To better describe and illustrate embodiments and / or examples of the applications disclosed herein, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed applications, the embodiments and / or examples currently described, or the best mode of conduct of these applications as currently understood.

[0012] Figure 1 This is a schematic diagram of a Pockelbox high-voltage power supply with two transformers connected in parallel, provided in one embodiment. Figure 2 This is a schematic diagram of the parallel output structure in one embodiment. Detailed Implementation

[0013] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0015] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0016] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Although the illustrations only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation, the form, quantity and proportion of each component in the actual implementation can be arbitrarily changed, and the layout of the components may also be more complex.

[0017] Currently, the main method for boosting voltage in a Pockel cell is through a voltage multiplier circuit. A transformer is used to raise the voltage to a slightly higher level, which is then amplified by the voltage multiplier circuit. However, this high-voltage source has limitations in output power and cannot meet the high-voltage pulse modulation requirements of Pockel cell modulators above 10kHz. In this case, a direct voltage boost and rectification method using a transformer is more suitable for high-repetition-rate high-voltage pulse applications. To address these needs, this invention provides a high-voltage power supply, comprising:

[0018] The half-bridge circuit 100 uses an LLC control chip to process the voltage and current feedback signals provided by the feedback circuit 140 to generate PWM signals that drive the half-bridge MOS.

[0019] LLC resonant network 110 connects the half-bridge MOS driven by half-bridge circuit 100 to the primary coils of two transformers 120, and performs resonant amplification through series resonant inductors and resonant capacitors to modulate and amplify the external low-voltage DC signal.

[0020] The dual transformer 120 uses an ETD series transformer core frame. The required turns ratio is calculated to amplify the low-voltage signal. The primary coils of the two transformers are connected in series with a half-bridge MOSFET, and the secondary coils are each connected to a rectifier circuit 130.

[0021] The rectifier circuit 130 uses high-voltage fast recovery diodes to form a high-voltage half-wave rectifier circuit. It performs positive voltage rectification on one transformer 120 to generate a positive high-voltage DC signal, and performs negative voltage rectification on the other transformer 120 to generate a negative high-voltage DC signal. The grounds of the two transformers are connected together as a common ground. Each high-voltage DC signal output terminal is equipped with a grounded high-voltage power resistor.

[0022] The output circuit 150 connects the positive high-voltage DC signals of the two high-voltage sources 200 and connects the negative high-voltage DC signals of the two high-voltage sources, such as... Figure 2 As shown, both high-voltage sources are powered on and output simultaneously during use.

[0023] Feedback circuit 140 uses a voltage divider resistor to sample the positive high-voltage output signal from transformer 120, obtaining feedback voltage and current signals. The feedback signals are compared with a power reference signal to control the power output of the half-bridge circuit. When the output power of one high-voltage source 210 reaches its upper power limit, the power is controlled to stop increasing. At this point, the second high-voltage source 220 connected in parallel begins to output power until it reaches its upper power limit, at which point full power output is achieved.

[0024] The dual transformer 120 in the example is not limited to two transformers; two or more transformers can be used to combine and step up the voltage.

[0025] The connection method of the two high-voltage sources 200 in the example is not limited to two high-voltage sources. Two or more high-voltage sources can be connected in parallel to achieve high-voltage output.

[0026] Please note that the above embodiments are for illustrative purposes only and do not imply any limitation on this application.

[0027] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0028] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A Pockelbox high-voltage power supply with two transformers in parallel, characterized in that, include: The feedback circuit is used to acquire the output voltage and current of a transformer and provide the feedback voltage and current signals to the half-bridge circuit. The half-bridge circuit and LLC resonant topology network are used to generate PWM signals to drive the half-bridge MOS circuit. Through the turns ratio of the parallel transformer and resonant amplification, the voltage is boosted to generate two high-voltage AC signals. The rectifier circuit is used to rectify the high-voltage AC signals to obtain high-voltage DC signals. The output circuit is used to connect the high-voltage DC signals in parallel.

2. The high-voltage power supply according to claim 1, characterized in that, The feedback circuit obtains voltage and current feedback signals by sampling and dividing the high-voltage DC voltage and using the current shunting signal for the use of the half-bridge circuit.

3. The high-voltage power supply according to claim 1, characterized in that, An LLC resonant topology network is driven by a half-bridge circuit. The topology network contains two transformers, each sharing half of the voltage level, sharing a primary coil, and the secondary coils respectively generate two high-voltage AC signal outputs.

4. The high-voltage power supply according to claim 1, characterized in that, The two high-voltage AC signals are rectified by a half-wave rectifier bridge and a high-voltage capacitor, and then smoothed to suppress ripple, resulting in two high-voltage DC signals.

5. The high-voltage power supply according to claim 1, characterized in that, By connecting the two high-voltage DC signals from the two high-voltage power supplies in parallel, the output power of the two high-voltage DC signals is increased.

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