A heating structure for preventing surge current from affecting tuning magnetic field

Abstract

The present invention discloses a counter-heating structure for preventing surge current from affecting a tuning magnetic field, belonging to the technical field of magnetic devices. The structure comprises a heating sleeve (1), a PTC ceramic heating plate (2) and a connecting line (3), wherein the PTC ceramic heating plate (2) is fixed on the heating sleeve (2), and a plurality of PTC ceramic heating plates (2) and the heating sleeve (1) are connected in parallel via the connecting line (3) to form a heating circuit, wherein the heating circuit is symmetrically arranged. By adopting the counter-heating structure of the present invention, at the moment when the heating operation is turned on (within 2 to 5 seconds), the response curve of the magnetic tuning device realizes a frequency jump of 0 MHz. The technical development of the structure and the application prospect of improving the temperature stability of the device in the field of magnetic tuning devices are broad.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic devices, and in particular to a heating cancellation structure for preventing surge current from affecting a tuned magnetic field. Background Art

[0002] Magnetic tuning devices hold broad application prospects in both military electronic warfare and civilian instrumentation, enabling wideband reconnaissance, panoramic reception, and spectrum analysis. They enable automated search, tracking, and selection of desired frequency signals amidst a dense and complex array of electromagnetic signals, while suppressing irrelevant signals. Due to their wide tuning range, excellent tuning linearity, and high out-of-band rejection, magnetic tuning can achieve frequency-selective filtering or interference suppression, a feat previously accomplished by combining numerous switched filter arrays, significantly simplifying overall system design.

[0003] Modern electronic systems have increasingly higher requirements for the temperature stability of magnetic tuning devices, while also requiring an increasingly wider operating temperature range.

[0004] The core of the magnetic tuning device is the resonator - the YIG ball. When the external ambient temperature changes, the anisotropy field and saturation magnetization intensity of the YIG ball change greatly with the temperature, thereby affecting the temperature stability of the magnetic tuning device.

[0005] In order to maintain the stability of the anisotropy field and saturation magnetization, the working principle of current limiting and temperature limiting of the PTC ceramic heater is utilized. By using the PTC heater, the YIG ball resonator is kept at a constant temperature. On the one hand, it can ensure that the saturation magnetization and anisotropy field of the ball do not change with temperature. At the same time, by controlling the temperature of the heater, the heater works above the maximum ambient temperature, which can resist the frequency change caused by the external ambient temperature change.

[0006] At present, the heating structure of conventional magnetic tuning devices is as follows Figure 1 As shown, it consists of a heating sleeve 1, a PTC ceramic heating plate 2, a connecting wire 3 and a dielectric cavity 4. The heating sleeve 1 is generally made of beryllium bronze material through machining, the PTC ceramic heating plate 2 is generally made of semiconductor functional ceramic material with barium titanate as the main component, and the connecting wire 3 is generally made of Φ0.2mm copper wire.

[0007] The disadvantage of the traditional magnetic tuning device heating structure is that there is no targeted design to reduce the influence of the induced electromotive force generated by the surge current of the PTC ceramic heater on the tuning magnetic field. It is impossible to avoid the frequency jump of 5 to 20 MHz in the response curve caused by the heating structure at the moment of starting work. Figure 2 As shown, this will affect the device's ball temperature stability axis debugging accuracy and temperature stability. Summary of the Invention

[0008] The purpose of the present invention is to provide a heating structure for preventing surge current from affecting the tuning magnetic field, so as to solve the above problems.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a counteracting heating structure for preventing surge current from affecting the tuned magnetic field, comprising a heating sleeve, a PTC ceramic heating plate and a connecting wire, wherein the PTC ceramic heating plate is fixed on the heating sleeve, and the PTC ceramic heating plate and the heating sleeve are connected by a connecting wire to form a heating circuit, and the heating circuit is symmetrically arranged.

[0010] The PTC ceramic heating piece and the heating sleeve can be fixed by welding or the like.

[0011] As a preferred technical solution, the resistance of each ceramic heating plate is the same. Ceramic heating plates with the same resistance further strengthen the symmetrical structure.

[0012] As a preferred technical solution: the resistance of each ceramic heating plate is 50-100Ω and the volume is 6×4×1.5mm 3 .

[0013] The design principle diagram of the heating structure of the present invention is as follows: Figure 3 As shown, the circuit symmetry design method is used to make the magnetic field generated by the surge current generated by the PTC ceramic heater ( Figure 3 The directions of H1 and H2 in the figure are opposite, so that the magnetic fields generated by the surge current cancel each other out and do not form any magnetic field superposition effect on the tuning magnetic field. This achieves a 0MHz jump in the response curve of the magnetic tuning device at the moment the heating work is turned on (within 2 to 5 seconds), which can effectively improve the device's ball temperature stability axis debugging accuracy and the temperature stability of the magnetic tuning device.

[0014] Compared with the existing technology, the advantages of the present invention are: by adopting the counter-heating structure of the present invention, at the moment when the heating operation is turned on (within 2 to 5 seconds), the response curve of the magnetic tuning device achieves a frequency jump of 0MHz. The development of this structural technology and the application prospects of improving the temperature stability of devices in the field of magnetic tuning devices are broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the traditional heating structure used for magnetic tuning devices;

[0016] Figure 2 for Figure 1 Schematic diagram of frequency hopping caused by the heating structure;

[0017] Figure 3 This is a schematic diagram of the design principle of the counter-heating structure of the present invention;

[0018] Figure 4 FIG. 4 is a diagram of a heating structure for canceling out the influence of surge current on the tuning magnetic field according to an embodiment of the present invention.

[0019] Figure 5 A schematic diagram of frequency hopping caused by the heating structure of the present invention;

[0020] In the figure: 1. Heating jacket; 2. PTC ceramic heating plate; 3. Connecting wire; 4. Dielectric cavity. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Example:

[0023] See also Figure 4 A heating structure for preventing surge current from affecting the tuning magnetic field includes four sets of heating sleeves 1, PTC ceramic heating plates 2, and connecting wires 3. Each PTC ceramic heating plate 2 is fixed to the heating sleeve 1 by welding. The four PTC ceramic heating plates 2 are connected in parallel with the four heating sleeves 1 via connecting wires 3 to form a heating circuit. The heating circuit is symmetrically arranged. The resistance value of each PTC ceramic heating plate 2 is the same, all 50-100Ω, and the volume is 6×4×1.5mm. 3 The heating jacket 1 is made of the traditional beryllium bronze material, and the connecting wire 3 is made of the traditional copper wire.

[0024] The response curves of the heating cancellation structure of this embodiment when not heated and heated are as follows: Figure 5 As shown, from Figure 5 It can be seen from the figure that this structure achieves 0MHz jump during heating, ensuring the temperature stability of the magnetic tuning device.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heating structure for preventing surge current from affecting a tuned magnetic field, comprising a heating sleeve (1), a PTC ceramic heating plate (2) and a connecting wire (3), characterized in that: The PTC ceramic heating sheet (2) is fixed on the heating sleeve (1), and the PTC ceramic heating sheet (2) and the heating sleeve (1) are connected via a connecting line (3) to form a heating circuit. There are four groups of heating circuits in total, and the four groups of heating circuits are symmetrically arranged vertically and horizontally. The surge current directions of the two groups of heating circuits symmetrically arranged vertically are the same, and the surge current directions of the two groups of heating circuits symmetrically arranged horizontally are the same. The resistance value of each of the PTC ceramic heating sheets (2) is the same. The counter-heating structure is used for a magnetic tuning device, and the YIG ball of the magnetic tuning device is located at the center of the heating circuit symmetrically arranged vertically and horizontally.

2. The heating structure for preventing surge current from affecting the tuning magnetic field according to claim 1, characterized in that: The resistance of each PTC ceramic heating plate (2) is 50-100Ω and the volume is 6×4×1.5mm. 3 .

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