Pulse forming circuit and LTD module

Abstract

According to the improved pulse forming circuit and LTD module design, Brick branches are connected in parallel during charging, and high voltage and high current cannot be generated in the circuit; and during discharging, each Bick branch independently discharges and does not interfere with each other. The LTD module comprises N Brick branches, each Brick branch is in coupling connection with a secondary load through a magnetic core of the LTD module, the Brick branches are connected in parallel at a power supply end, and each secondary coil is connected in series with the load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuits, in particular to a pulse forming circuit and an LTD module. BACKGROUND

[0002] Solid-state linear transformer driver (LTD) is one of the new pulse power circuit methods. The basic unit of a typical LTD driver source is an LTD module, each LTD module is composed of multiple Brick branches and switches S, and the multiple Brick branches are connected in parallel and then coupled through a magnetic core to transmit energy to the secondary load. Figure 1 The circuit connection principle diagram of the Brick connection in the LTD module is described, after the capacitors in the Brick branches in the module are charged, when the Brick branch switches are turned on, the electric pulses generated by the parallel Brick branches are transmitted to the load through the magnetic core coupling (equivalent to a 1:1 transformer). However, this design affects the output front of the LED module due to the switching time jitter and the difference between the switches. Moreover, the primary coil needs to pass through a large current, which can cause the temperature of the coil to rise rapidly. The high temperature can cause the insulation material of the coil to fail, thereby causing the coil to burn out. At the same time, when the current is too large, the inductor may be saturated.

[0003] A new design scheme is proposed in patent CN215378883U, as shown in Figure 2 By changing the circuit connection mode of the Brick branch inside the LTD module, the self-synchronous connection mode is adopted to make all Brick branches discharge to the secondary load at the same time, thereby eliminating the influence of the dispersion of the switching-on time of multiple switches on the output front of the LTD module. This improved design adopts the form of series connection of Brick branches, which causes the voltage of the Brick branch section to be very high during discharge, and the requirements for electrical elements such as switches and capacitors in the Brick branch are very high. In actual use, the high voltage often breaks down the components in the circuit, and the service life of the circuit is short. In addition, since all the Brick branches are connected in series, when one of the components fails, the entire module will fail, and it is also difficult to find the fault position. Practical new type content

[0004] Therefore, the purpose of the present application is to provide a pulse forming circuit and an LTD module to improve the problems in the above designs.

[0005] To solve the above technical problems, the embodiments of the present application achieve the following:

[0006] The application relates to a pulse forming circuit and an LTD module, wherein the LTD module comprises N Brick branches, each of which is coupled with a secondary load through an LTD module magnetic core, each of the Brick branches is connected in parallel at a power supply end, and each of the secondary coils is connected in series with a load. Each of the Brick branches comprises at least a switch, a diode and a capacitor.

[0007] In some embodiments, the LTD module magnetic core is a ring-shaped magnetic core, which can be a circular ring or a square ring.

[0008] In some embodiments, the switch can be a gas switch, an IGBT (Insulated Gate Bipolar Transistor) switch, a MOSFET switch or the like, and preferably a MOSFET switch.

[0009] In some embodiments, the ratio of the primary coil to the secondary coil of the LTD magnetic core is 1:1-5.

[0010] In some embodiments, each of the primary coils of the LTD magnetic core is connected in parallel with a discharge diode D i .

[0011] In some embodiments, the pulse forming circuit mainly comprises a direct current power supply, a charging switch Q0, a charging diode D0, N capacitors C i , N discharge switches Q i , N discharge diodes D i and N LTD magnetic cores, i=1, 2, 3..., N; and the circuit structure is shown in the following:

[0012] The positive pole of the direct current power supply is connected with the anode of the charging diode D0, the cathode of the charging diode D0 is connected with the positive pole of the capacitor C i , and the negative pole of the capacitor C i is connected with the positive pole of the discharge diode D i and the primary coil of the LTD magnetic core respectively.

[0013] In some embodiments, the pulse signal in the pulse forming circuit is transmitted to the MOSFET switch through an optical cable.

[0014] In another aspect, the application further provides an LTD module and a circuit thereof, which are realized by the circuit described in the application.

[0015] The application has the following advantages and beneficial effects:

[0016] 1. In the pulse forming circuit and the LTD module, the Brick branches are connected in parallel, high voltage and high current are not generated in the circuit, and the requirements for the components in the circuit are low.

[0017] 2. The pulse forming circuit and LTD module of the present application have high overall safety.

[0018] 3. When discharging, the pulse forming circuit and LTD module of the present application discharge independently in each Brick branch, do not interfere with each other, do not affect the overall circuit when a single module fails, and can quickly identify and repair the faulty circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 Figure 1 is a schematic diagram of the internal Brick parallel output structure circuit principle of a traditional LTD module;

[0021] Figure 2 Figure 2 is a schematic diagram of the internal self-synchronous circuit principle of the LTD module in the CN215378883U patent;

[0022] Figure 3 Figure 3 is a schematic diagram of the pulse forming circuit and LTD module circuit principle of the present application;

[0023] Figure 4 Figure 4 is a schematic diagram of the LTD charging of the present application;

[0024] Figure 5 Figure 5 is a schematic diagram of the LTD discharging of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will describe the technical solutions in the embodiments of the present application clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0031] Example 1

[0032] Compared to traditional typical LTD modules, this embodiment proposes an improved circuit for the charging / discharging synchronization of internal branches within an LTD module. The circuit in this embodiment employs the following... Figure 3 The LTD module is designed to include N Brick branches, each of which is coupled to the secondary load via the LTD module core. Each Brick branch is connected in parallel at the power supply terminal, and each secondary coil is connected in series with the load. Each Brick branch includes at least a switch, a diode, and a capacitor.

[0033] In this embodiment, there can be 5 to 100 Brick branches.

[0034] In this embodiment, the LTD module core is a toroidal core.

[0035] In this embodiment, the Brick branch is wound around the magnetic core of each LTD module, with a total of 1 turn. The secondary coil has m turns, where 1 ≤ m ≤ 5. The ratio of the internal voltage of the LTD module to the secondary output voltage is 1:m.

[0036] Example 2

[0037] like Figure 4 As shown, when the LTD circuit is charged, each Brick branch is connected in parallel with the power supply, switch Q0 is turned on, and switches Q1 to Q2 are turned on. N Disconnect the DC power supply to capacitors C1 to C2 in each branch. NCharging is carried out. The DC power voltage is U0, and each branch voltage is also U0. The charging switch is controlled by Q0, which ensures the consistency of charging.

[0038] Embodiment 3

[0039] As shown in title 5, when discharging the LTD circuit, switch Q0 is turned off, switches Q1-Q N are turned on, and each Brick branch discharges independently. At the same time, the energy stored on the capacitor is transmitted to the high-voltage output port (load end) after being isolated by electromagnetic coupling, and a superimposed voltage is output. Each Brick branch discharges independently during discharging. For example, Q1, C1, and the magnetic induction coil form a discharging loop. At the secondary coil end (B end), the induced voltage is connected in series to obtain a superimposed voltage. When the voltage of a single Brick branch is U, the primary coil: secondary coil is 1:2, and the load voltage U mix = U x 2 x N can be obtained. The load end is usually an output electrode needle, and there are no other electrical elements. Compared with the existing design A, the voltage and current at the A end are both low, and there is no special requirement for the electrical elements used, which greatly improves the safety of the equipment.

[0040] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An LTD module, characterized in that, The LTD module includes N Brick branches, each of which is coupled to the secondary load through the LTD module core. Each Brick branch is connected in parallel at the power supply end, and each secondary coil is connected in series with the load.

2. The LTD module according to claim 1, characterized in that, The Brick branch includes a switch, a diode, and a capacitor.

3. The LTD module according to claim 1, characterized in that, The LTD module core is a toroidal core.

4. The LTD module according to claim 2, characterized in that, The switch is a MOSFET switch.

5. The LTD module according to claim 1, characterized in that, The ratio of primary coil to secondary coil in an LTD magnetic core is 1:1 to 5.

6. The LTD module according to claim 1, characterized in that, The primary coils and discharge diodes D of the LTD magnetic core i Parallel connection.

7. A pulse forming circuit, characterized in that, The pulse forming circuit mainly includes a DC power supply, a charging switch Q0, a charging diode D0, and N capacitors C. i N discharge switches Q i N discharge diodes D i With N LTD modules, i=1,2,3,...,N; the circuit structure is shown below: The positive terminal of the DC power supply is connected to the anode of the charging diode D0, and the cathode of the charging diode D0 is connected to the capacitor C. i The positive terminal of the capacitor C is connected. i The negative terminals are respectively connected to the discharge diode D i The positive terminal is connected to the primary coil of the LTD module.

8. The pulse forming circuit according to claim 7, characterized in that, In the pulse forming circuit, the pulse signal is transmitted to the MOSFET switch of the LTD module via an optical fiber.

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