Soft start circuit of transformer and electronic equipment
By designing a transformer soft start circuit including surge suppression module and control module, the problem of high starting delay cost of transformer soft starter in the prior art is solved, and a higher service life and stability are achieved while reducing costs.
Patent Information
- Application Number
- CN202420241692.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The starting delay cost of existing transformer soft starters is high, and resistance heating affects service life and stability.
A soft start circuit of a transformer is designed, including a power supply module, a surge suppression module, a voltage conversion module and a control module. The start time of the transformer is delayed through the surge suppression module and a control module. The circuit structure is simple and the cost is low.
It reduces the start-up delay cost of transformer soft starter, improves service life and stability, has a simple circuit structure and a low cost.
Smart Images
Figure CN222655037U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power electronics, and in particular relates to a soft starting circuit of a transformer and electronic equipment. Background Art
[0002] As a conventional structure in the prior art, the soft starter of a high-power transformer needs to be delayed when starting. In the prior art, NTC materials are mainly used as buffers, or resistors are used in conjunction with a single-chip microcomputer for timing, or other additional delay circuits are used for delay. Although they can meet the general usage requirements, the production cost is high, and the resistors will also generate a certain amount of heat when in use, which will also affect the service life and stability of the entire soft starter, and the applicability and practicality are limited.
[0003] Therefore, how to reduce the startup delay cost of the transformer soft starter and increase the service life of the transformer soft starter is a technical problem that needs to be solved urgently. Utility Model Content
[0004] In order to solve the problem of high startup delay cost of the existing transformer soft starter, the utility model provides a transformer soft start circuit and electronic equipment.
[0005] In a first aspect, the utility model provides a soft start circuit of a transformer, including a power supply module, a surge suppression module, a voltage conversion module and a control module;
[0006] The power supply module is connected to the surge suppression module, and the power supply module is used to provide a first voltage signal to the soft start circuit and output the first voltage signal to the surge suppression module;
[0007] The surge suppression module is connected to the voltage conversion module, and the surge suppression module is used to absorb the surge voltage generated by the soft start circuit and output a second voltage signal after absorbing the surge voltage to the voltage conversion module;
[0008] The voltage conversion module is connected to the control module, and the voltage conversion module is used to convert the second voltage signal into a third voltage signal, and output the third voltage signal to the control module;
[0009] The control module is used to control whether the soft start circuit is connected, and output the third voltage signal received in the connected state to the external load.
[0010] Furthermore, the power supply module includes a power input terminal, the surge suppression module includes a first current limiting resistor, and the power input terminal is connected in series with the first current limiting resistor.
[0011] Furthermore, the voltage conversion module includes a first transformer, the control module includes a first AC relay, the input end of the first transformer is connected in series with the first current limiting resistor, and the output end of the first transformer is connected in parallel with both ends of the coil of the first AC relay.
[0012] Furthermore, two ends of the normally open contacts of the first AC relay are connected in parallel with the first current limiting resistor.
[0013] Furthermore, the power input terminal is also connected in series with a first AC contactor, and the first AC contactor is connected in parallel with the first current limiting resistor.
[0014] Furthermore, the surge suppression module includes a second current limiting resistor, a third current limiting resistor and a fourth current limiting resistor, the voltage conversion module includes a second transformer, and the second current limiting resistor, the third current limiting resistor and the fourth current limiting resistor are respectively connected to the input end of the second transformer.
[0015] Furthermore, the power input terminal is also connected in series with a second AC contactor, and the second AC contactor is connected in parallel with the second current limiting resistor, the third current limiting resistor and the fourth current limiting resistor.
[0016] Furthermore, the first transformer is a single-phase transformer, and the second transformer is a three-phase transformer.
[0017] Furthermore, the first AC contactor is a single-phase AC contactor, and the second AC contactor is a three-phase AC contactor.
[0018] In a second aspect, the utility model provides an electronic device, comprising a device body and a soft start circuit of the transformer as described in any one of the first aspects above, which is arranged on the device body.
[0019] Compared with the prior art, the soft start circuit of the transformer provided by the utility model is provided with a surge suppression module and a control module. The surge suppression module is connected to the voltage conversion module. The surge suppression module is used to absorb the surge voltage generated by the soft start circuit. The control module is used to control whether the soft start circuit is connected and output the voltage signal received in the connected state to the external load. The circuit provided by the utility model only uses the surge suppression module and the control module to delay the start time of the transformer. The circuit structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic diagram of the framework structure of a soft start circuit of a transformer provided by an embodiment of the utility model;
[0021] Figure 2A schematic diagram of the circuit structure of a soft start circuit of a first transformer provided in an embodiment of the utility model;
[0022] Figure 3 A circuit structure schematic diagram of a soft start circuit of a second transformer provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0024] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation method and specific examples of the utility model; however, this is not the only form of implementing or using the specific examples of the utility model. The implementation method covers the features of multiple specific examples and the method steps and their sequence for constructing and operating these specific examples. However, other specific examples can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.
[0026] In the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, “multiple” means two or more than two, and other quantifiers are similar. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention, and the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.
[0027] In order to solve the problem of high startup delay cost of the existing high-power transformer soft starter, the utility model provides a transformer soft start circuit, please refer to Figure 1-3 , Figure 1 A schematic diagram of the framework structure of a soft start circuit of a transformer provided in an embodiment of the utility model includes a power supply module 10, a surge suppression module 20, a voltage conversion module 30 and a control module 40; the power supply module 10 is connected to the surge suppression module 20, and the power supply module 10 is used to provide a first voltage signal to the soft start circuit, and output the first voltage signal to the surge suppression module 20; the surge suppression module 20 is connected to the voltage conversion module 30, and the surge suppression module 20 is used to absorb the surge voltage generated by the soft start circuit, and output the second voltage signal after absorbing the surge voltage to the voltage conversion module 30; the voltage conversion module 30 is connected to the control module 40, and the voltage conversion module 30 is used to convert the second voltage signal into a third voltage signal, and output the third voltage signal to the control module 40; the control module 40 is used to control whether the soft start circuit is connected, and output the third voltage signal received in the connected state to the external load. In the embodiment of the utility model, by setting the surge suppression module 20 and the control module 40 to delay the start time of the transformer, the circuit structure is simple and the cost is low.
[0028] For further information, please refer to Figure 2 , Figure 2 A circuit structure diagram of a soft start circuit of a first transformer provided in an embodiment of the utility model, the power supply module 10 includes a power input end, the surge suppression module 20 includes a first current limiting resistor R1, the power input end is connected in series with the first current limiting resistor R1, in the embodiment of the utility model, the power input end is the mains input end of the power grid, the first current limiting resistor R1 is a high-power current limiting resistor, and the power input end is connected to the high-power current limiting resistor to suppress the surge current at the moment of transformer startup when the soft starter of the transformer is turned on, thereby preventing the air switch / circuit breaker from causing false tripping.
[0029] Further, the voltage conversion module 30 includes a first transformer, the control module 40 includes a first AC relay K2, the input end of the first transformer is connected in series with the first current limiting resistor R1, and the output end of the first transformer is connected in parallel with the two ends of the coil of the first AC relay K2. In the embodiment of the utility model, after the mains power is input, the L input end is connected to a high-power current limiting resistor R1 and then input to the input end of the transformer, and the output end of the first transformer is connected in parallel with the two ends of the coil of the AC relay. At this time, the selection of the first AC relay K2 needs to be determined according to the output voltage of the first transformer to determine the coil voltage and the normal working current of the transformer starter for selection.
[0030] Furthermore, both ends of the normally open contact of the first AC relay K2 are connected in parallel with the first current limiting resistor R1. In the embodiment of the utility model, when the transformer soft starter is powered on, since the first transformer has not yet established a magnetic field, the first transformer is a short-circuit device, and therefore, the surge current can be absorbed by the first current limiting resistor R1.
[0031] Furthermore, the power input terminal is also connected in series with a first AC contactor K1, and the first AC contactor K1 is connected in parallel with the first current limiting resistor R1. When the first transformer establishes a magnetic field and works normally, the output terminal of the first transformer will output a normal working voltage. This working voltage can start the first AC relay K2 to operate. When the first AC relay K2 operates, the first current limiting resistor R1 will short-circuit the AC relay K2, and the working current of the first transformer will be input through the first AC contactor K1 to complete the soft start process.
[0032] For further information, please refer to Figure 3 , Figure 3 A circuit structure diagram of a soft start circuit of a second transformer provided in an embodiment of the utility model, the surge suppression module 20 includes a second current limiting resistor R2, a third current limiting resistor R3 and a fourth current limiting resistor R4, the voltage conversion module 30 includes a second transformer, and the second current limiting resistor R2, the third current limiting resistor R3 and the fourth current limiting resistor R4 are respectively connected to the input end of the second transformer. In the embodiment of the utility model, three current limiting resistors can be set to absorb the surge voltage generated by the three phases.
[0033] Further, the power input end is also connected in series with a second AC contactor K3, and the second AC contactor K3 is connected in parallel with the second current limiting resistor R2, the third current limiting resistor R3 and the fourth current limiting resistor R4. Specifically, in the embodiment of the utility model, the input end of the power supply is respectively connected to the three-phase power supply line of the second AC contactor, wherein L1 is the A-phase power supply line, L2 is the B-phase power supply line, and L3 is the C-phase power supply line; in addition, the first main contact K3-1 of the second AC contactor K3 is connected in parallel with the second current limiting resistor R2, the second main contact K3-2 of the second AC contactor K3 is connected in parallel with the third current limiting resistor R3, and the third main contact K3-3 of the second AC contactor K3 is connected in parallel with the fourth current limiting resistor R4. When the second transformer is powered on, the working current of the second transformer will be input through the second AC contactor K3 to complete the soft start process.
[0034] Furthermore, the first transformer is a single-phase transformer, and the second transformer is a three-phase transformer. In the embodiment of the utility model, for the three-phase transformer, the above transformer soft start circuit can be connected to each phase for control, or three current limiting resistors can be connected to each phase for current limiting, but a three-phase AC contactor is used for protection detection and control.
[0035] Further, the first AC contactor is a single-phase AC contactor, and the second AC contactor is a three-phase AC contactor. In the embodiment of the utility model, the single-phase transformer matches the single-phase AC contactor, and the three-phase transformer matches the three-phase AC contactor.
[0036] Based on the soft start circuit of the transformer, the embodiment of the utility model further provides an electronic device, which includes a device body and a soft start circuit of the transformer as described above, which is arranged in the device body. The provided electronic device can delay the start time of the transformer, has a simple circuit structure, and is low in cost.
[0037] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.
[0038] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A soft start circuit for a transformer, characterized in that: It includes a power supply module, a surge suppression module, a voltage conversion module and a control module; The power supply module is connected to the surge suppression module, and the power supply module is used to provide a first voltage signal to the soft start circuit and output the first voltage signal to the surge suppression module; The surge suppression module is connected to the voltage conversion module, and the surge suppression module is used to absorb the surge voltage generated by the soft start circuit and output a second voltage signal after absorbing the surge voltage to the voltage conversion module; The voltage conversion module is connected to the control module, and the voltage conversion module is used to convert the second voltage signal into a third voltage signal, and output the third voltage signal to the control module; The control module is used to control whether the soft start circuit is connected, and output the third voltage signal received in the connected state to the external load.
2. The soft start circuit of the transformer according to claim 1, characterized in that: The power supply module includes a power input terminal, the surge suppression module includes a first current limiting resistor, and the power input terminal is connected in series with the first current limiting resistor.
3. The soft start circuit of the transformer according to claim 2, characterized in that: The voltage conversion module includes a first transformer, the control module includes a first AC relay, the input end of the first transformer is connected in series with the first current limiting resistor, and the output end of the first transformer is connected in parallel with both ends of the coil of the first AC relay.
4. The soft start circuit of the transformer according to claim 3, characterized in that: Both ends of the normally open contact of the first AC relay are connected in parallel with the first current limiting resistor.
5. The soft start circuit of the transformer according to claim 4, characterized in that: The power input terminal is also connected in series with a first AC contactor, and the first AC contactor is connected in parallel with the first current limiting resistor.
6. The soft start circuit of the transformer according to claim 5, characterized in that: The surge suppression module includes a second current limiting resistor, a third current limiting resistor and a fourth current limiting resistor, and the voltage conversion module includes a second transformer, and the second current limiting resistor, the third current limiting resistor and the fourth current limiting resistor are respectively connected to the input end of the second transformer.
7. The soft start circuit of the transformer according to claim 6, characterized in that: The power input terminal is also connected in series with a second AC contactor, and the second AC contactor is connected in parallel with the second current limiting resistor, the third current limiting resistor and the fourth current limiting resistor.
8. The soft start circuit of the transformer according to claim 7, characterized in that: The first transformer is a single-phase transformer, and the second transformer is a three-phase transformer.
9. The transformer soft start circuit according to claim 8, characterized in that: The first AC contactor is a single-phase AC contactor, and the second AC contactor is a three-phase AC contactor.
10. An electronic device, characterized in that: The invention comprises a device body and a soft start circuit of a transformer as claimed in any one of claims 1 to 9 arranged on the device body.