H-type pickup device with voltage detection and capacitance compensation circuit
By adopting the dual-coil winding and series capacitance compensation design of H-type pickup in the OHT system of the semiconductor factory, combined with voltage detection, the problem of excessive induction voltage of the pickup coil is solved, and the safe and stable operation of the system and insulation pressure are achieved. The reduction.
Patent Information
- Application Number
- CN202420740007.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-11
AI Technical Summary
In the OHT system of semiconductor factory, the transport unit operating with high degree of freedom causes the pickup coil induction voltage to be too high, resulting in large insulation pressure, affecting the safe and stable operation of the system.
A H-type pickup is designed, adopting a dual-coil winding structure and compensating through series capacitors between the coils, and combining with a voltage detection circuit to ensure that the system operates within a safe range.
It effectively reduces the withstand voltage level of the coil of the wireless power supply system, reduces the insulation pressure, and prevents coil short circuits or between turns short circuits through voltage detection to ensure the safe operation of the system.
Smart Images
Figure CN222300438U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wireless power supply, in particular to an H-type pickup with voltage detection and a capacitance compensation circuit. Background Art
[0002] The multi-track wireless power supply system based on wireless power transfer (WPT) technology can overcome the disadvantages of electrical connections between wired systems and has the advantages of high reliability and strong portability. Therefore, it is widely used in the fields of mobile electronics, implantable medical devices and electric vehicles. In semiconductor factories, research is mainly focused on high-power multi-load track wireless power supply systems in the overhead hoist transfer (OHT) production line to meet the dust-free handling requirements of high-precision production in the cleanroom of the foundry.
[0003] Considering that in the OHT system of a semiconductor factory, a high-degree-of-freedom transport unit is conducive to improving the factory's production efficiency, a reasonable pickup shape and winding method can help ensure the efficient operation of the system without problems such as cable dragging and wear. In the actual OHT system, excessive pickup and induced voltages affect the safe and stable operation of the system. How to achieve high-degree-of-freedom operation of the transport unit between multiple tracks and solve the insulation pressure and temperature pressure of the transport unit, design a reasonable pickup winding structure and corresponding compensation method are solutions to the above problems. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art. In view of the problems such as the power pickup method in the high-power multi-track wireless power supply system and the high insulation pressure caused by the excessive induced voltage of the pickup coil, an H-type pickup and a capacitance compensation circuit with double coil winding and compensation method of series capacitance between coils are proposed.
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: an H-type pickup with voltage detection, including: a pickup, the pickup includes an H-type magnetic core structure and an installation cavity formed by an upper plate and a lower plate aligning and connecting a middle column, two groups of independent coils are tightly wound on the middle column of the H-type magnetic core structure, and grooves corresponding to the external transmitting guide rail are formed on both sides of the column, and an integral insulating plate is installed on the top of the upper plate and the bottom of the lower plate. The outer sides of the two insulating plates are tightly fixed by isolation plates respectively, and the installation cavity screws are fixed to the top of the insulating plate corresponding to the upper plate, which has a resonant capacitor plate and a main circuit board built in and is sealed at the top by a top cover, and the inner cavity around the pickup is spliced by multiple kits and filled with epoxy resin for sealing.
[0006] Furthermore, the two coils are wound in the same direction and are both made of Litz wire, the two coils are wound with the same number of turns and both have outgoing wires left to be connected in series with the resonant capacitor plate.
[0007] Furthermore, the centers of the two insulating plates are hollowed out, and the two sides thereof are symmetrically raised, and the height of the raised parts is greater than the thickness of the upper plate and the lower plate.
[0008] Furthermore, the kit includes an I-shaped plate and a U-shaped plate respectively located at two opposite ends of the pickup, the thickness of the upper and lower ends of the I-shaped plate respectively correspond to the thickness of the short side ends of the two insulating plates, the bottom of the U-shaped plate is laterally embedded in the groove, and the two ends of the top are bent outward by 90° relative to each other and the bending thickness corresponds to the thickness of the long side ends of the two insulating plates.
[0009] Furthermore, positioning holes are evenly distributed on the sides of the two insulating plates, and the upper and lower ends of the I-shaped plate and the bending parts of the U-shaped plate are pre-opened corresponding to the positioning holes.
[0010] A capacitance compensation circuit of the H-type pickup with voltage detection according to the above-mentioned method comprises a transmitting coil of two transmitting guide rails located in the groove, wherein L s1 and L s2 For the two sets of coils of the pickup, C s1 , C s2 and C s3 is the resonant capacitor connected in series with the two coils, where C s1 Connected in series between the two coils, C s2 and C s3 They are respectively connected in series on both sides of the two groups of coils, and the resonant capacitor is welded in the resonant capacitor plate.
[0011] Compared with the prior art, the beneficial effects of the utility model include: after the double-coil winding, the mutual inductance of a single group of coils is smaller than that of a single coil winding, the induced voltage is greatly reduced, and the withstand voltage level of the wireless power supply system coil is greatly reduced. The double-coil winding limits the coil voltage to a safe range through segmented series capacitors, which alleviates the insulation pressure of the pickup coil connected to the circuit board, and with the assistance of a voltage detection circuit, it can effectively detect short circuits between the turns of the double coils or short circuits to the ground, ensuring safe operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:
[0013] Figure 1 The schematic diagram of the H-type magnetic core structure proposed according to one embodiment of the utility model is shown schematically;
[0014] Figure 2 Schematically shows a schematic diagram of the pickup structure proposed according to an embodiment of the utility model;
[0015] Figure 3 The schematic diagram of the explosion structure of the pickup proposed according to one embodiment of the utility model is shown schematically;
[0016] Figure 4 The figure schematically shows a capacitance compensation circuit diagram proposed according to one embodiment of the utility model.
[0017] Numbers in the figure: 1. first coil; 2. second coil; 3. H-shaped magnetic core structure; 4. first groove; 5. second groove; 6. mounting cavity; 7. resonant capacitor plate; 8. main circuit board; 9. upper insulating plate; 10. lower insulating plate; 11. upper isolation plate; 12. lower isolation plate; 13. I-shaped plate; 14. U-shaped plate; 15. top cover. DETAILED DESCRIPTION
[0018] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.
[0019] According to one embodiment of the present invention, Figure 1-Figure 4 Shown.
[0020] A double coil winding method of a new type of H-type pickup for a wireless power supply system, the key lies in that the H-type magnetic core is made of magnetic conductive material, the upper plate and the lower plate are connected by a middle column, and grooves are left on both sides of the middle column to adapt to the guide rail of the transmitting end. The pickup is an "H"-shaped structure as a whole, such as Figure 1 As shown, the H-shaped magnetic core structure is composed of a first coil 1 and a second coil 2 tightly wound on the middle column of the H-shaped magnetic core, and grooves 4 and 5 are left on both sides of the H-shaped magnetic core structure for placing two transmitting guide rails.
[0021] like Figure 2 and Figure 3 As shown, magnetic shielding materials are also installed on the outer sides of the upper plate and the lower plate. The key lies in the mounting cavity 6 for storing the resonant capacitor plate and the main circuit board, and the mounting cavity stores the resonant capacitor plate 7 and the main circuit board 8. The upper insulating plate 9 is close to the upper plate of the H-type pickup, and the lower insulating plate 10 is close to the lower plate of the pickup. The upper isolation plate 11 and the lower isolation plate 12 made of aluminum alloy plate are used to be close to the upper insulating plate 9 and the lower insulating plate 10 to prevent electromagnetic interference.
[0022] The pickup box is made of Teflon material, and a pair of I-shaped plates 13 and a pair of U-shaped plates 14 are spliced on both sides to form a closed pickup cavity, which is filled with epoxy resin. The main circuit board 8 and the resonant capacitor plate 7 are enclosed by the installation cavity 6 and the top cover 17 to effectively prevent dust pollution. The two-group coil winding method is adopted, and the number of turns of a single group of coils is halved compared with the single coil winding, the mutual inductance of the transmitting end and the receiving end is reduced, and the induced voltage of a single group of coils is halved, which can reduce the voltage of a single group of coils to a safe range, ensuring the safe operation of the system.
[0023] Similarly, a new type of dual-coil series capacitor compensation circuit using the above-mentioned pickup structure is also within the protection scope of the present utility model. The track-type wireless power transmission system supplies a constant alternating current to the transmitting track. The pickup made of magnetic conductive material picks up the electric energy at the transmitting end through the principle of magnetic resonance, and converts the energy into electric energy for the load through the coil. The present invention is directed to the dual-coil winding method of the H-type pickup. The first coil 1 and the second coil 2 are independently wound on the center column. The two sets of coils have the same winding direction and are both Litz wires. The two sets of coils have the same number of turns and both coils have outgoing wires for connecting to the series resonant capacitor. The resonant topology circuit is as follows: Figure 4 . Among them, there are launch guides in both grooves for stable picking. L p1 and L p2 They are the transmitting coils of the two transmitting rails. s1 and L s2 It is a double coil of the H-type pickup. The two sets of coils are wound in the same direction and are tightly wound on the middle column of the H-type magnetic core at the same time. The two sets of coils are wound independently and have two outgoing wires. s1 , C s2 and C s3 Capacitor used to resonate in series with two sets of coils. s1 Connected in series between the two coils, and C s2 and C s3 The resonant capacitor is connected in series on both sides of the two groups of coils, and is welded in the resonant capacitor plate 7. The use of this compensation method can not only greatly reduce the voltage connected to the main circuit board 8, but also reduce the insulation pressure of the circuit board; it can also reduce the voltage of a single group of coils, so the voltage resistance requirements of the coils are reduced, thereby reducing costs and increasing the safety of system operation. Compared with the single-coil winding method, the design method of double-coil winding and series compensation capacitors between coils, the induced voltage of each group of coils is lower than that of the single-coil winding method. Under the double-coil design, the voltage of the first group of coils 1 and the second group of coils 2 is limited to a safe range; after the series capacitor is connected, the voltage connected to the circuit board is lower than that of the single coil, reducing the insulation pressure of the circuit board.
[0024] Stable pickup by the picker is a necessary condition for the safe and stable operation of the wireless power supply system. In view of the potential safety hazards of coil short circuit and turn-to-turn short circuit during the normal operation of the system, the voltage sampling circuit samples the voltages of the two sets of coils respectively, and then detects the voltage difference between the two coils to determine whether the coils have turn-to-turn short circuits or short circuits to the ground. The voltage values of the two sets of coils obtained by the voltage sampling circuit are compared. When the voltage difference between the first coil 1 and the second coil 2 exceeds the set tolerance value, the circuit will transmit a signal to the microcontroller, which will then be processed by the microcontroller to control the circuit cut-off to prevent the occurrence of safety accidents.
[0025] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.
Claims
1. An H-type pickup with voltage detection, characterized in that: include: A pickup, the pickup includes an H-shaped magnetic core structure and an installation cavity formed by an upper plate and a lower plate connected to a center column, two groups of independent coils are tightly wound on the center column of the H-shaped magnetic core structure, and grooves corresponding to the external transmitting guide rail are formed on both sides of the column. An integral insulating plate is installed on the top of the upper plate and the bottom of the lower plate, and the outer sides of the two insulating plates are tightly fixed by isolation plates respectively. The installation cavity is screwed to the top of the insulating plate corresponding to the upper plate, and a resonant capacitor plate and a main circuit board are built in it and sealed at the top by a top cover. The inner cavity around the pickup is spliced by multiple kits and filled with epoxy resin for sealing.
2. An H-type pickup with voltage detection according to claim 1, characterized in that: The two coils are wound in the same direction and are both made of Litz wire. The two coils are wound with the same number of turns and both have outgoing wires left to be connected in series with the resonant capacitor plate.
3. The H-type pickup with voltage detection according to claim 1, characterized in that: The centers of the two insulating plates are hollowed out, and the two sides thereof are symmetrically raised, and the height of the raised parts is greater than the thickness of the upper plate and the lower plate.
4. The H-type pickup with voltage detection according to claim 1, characterized in that: The kit includes an I-shaped plate and a U-shaped plate respectively located at two opposite ends of the pickup, the thickness of the upper and lower ends of the I-shaped plate respectively correspond to the thickness of the short side ends of the two insulating plates, the bottom of the U-shaped plate is horizontally embedded in the groove, and the two ends of the top are bent outward at 90° relative to each other and the bending thickness corresponds to the thickness of the long side ends of the two insulating plates.
5. The H-type pickup with voltage detection according to claim 4, characterized in that: Positioning holes are evenly distributed on the sides of the two insulating plates, and the upper and lower ends of the I-shaped plates and the bending parts of the U-shaped plates are pre-opened corresponding to the positioning holes.
6. A capacitance compensation circuit of an H-type pickup with voltage detection according to any one of claims 1 to 5, characterized in that: The transmitting coil comprises two transmitting guide rails located in the groove, and the compensation circuit has L s1 and L s2 For the two sets of coils of the pickup, C s1 , C s2 and C s3 is the resonant capacitor connected in series with the two coils, where C s1 Connected in series between the two coils, C s2 and C s3 They are respectively connected in series on both sides of the two groups of coils, and the resonant capacitor is welded in the resonant capacitor plate.