Direct current EMI filter energy circulation electric aging circuit and method

Abstract

The invention provides a direct current EMI filter energy circulation electric aging circuit and method, and the circuit comprises a direct current power supply which is used for providing direct current; the load is used for providing adjustable load resistance; the plurality of EMI filters are sequentially cascaded between the direct current power supply and the load to form a structure to be aged; the input end of the constant current source is connected with the two ends of the load, the positive output end of the constant current source is connected between the positive output end of the direct current power supply and the positive input end of the to-be-aged structure, and the negative output end of the constant current source is connected between the negative output end of the direct current power supply and the negative input end of the to-be-aged structure; and the constant current source is used for recovering the energy received by the two ends of the load and then returning the energy to the to-be-aged structure, and the output of the constant current source is adjustable. The circuit can achieve batch aging, is simple in structure, and can meet the aging requirements of the EMI filter.

Description

Technical Field

[0001] The invention relates to the field of filter applications, and in particular to a direct current EMI filter energy circulation electrical aging circuit and method. Background Art

[0002] The traditional DC EMI filter aging method uses the method of directly adding power and load to the DC EMI filter for aging. Although this method is simple, it has the problem of occupying a lot of power and load. In particular, DC EMI filters are often aged under relatively high power supply voltage and relatively large current conditions, which requires a lot of power and load, consumes a lot of energy, not only wastes energy, but also increases the aging cost, which is not conducive to large-scale aging. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention proposes a DC EMI filter energy circulation electrical aging circuit and method, which mainly solves the problems that traditional DC EMI filter electrical aging occupies a lot of power and load resources, consumes a lot of aging energy and is not conducive to large-scale aging.

[0004] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows.

[0005] The present application provides a DC EMI filter energy circulation electrical aging circuit, the circuit comprising: a DC power supply, which is used to provide DC power; a load, which is used to provide an adjustable load resistance; a plurality of EMI filters, each of which is cascaded in sequence between the DC power supply and the load to form a structure to be aged; a constant current source, whose input end is connected to the two ends of the load, the positive output end is connected between the positive output end of the DC power supply and the positive input end of the structure to be aged, and the negative output end is connected between the negative output end of the DC power supply and the negative input end of the structure to be aged, so as to recover the energy received at the two ends of the load and return it to the structure to be aged, wherein the output of the constant current source is adjustable.

[0006] In one embodiment of the present application, the circuit also includes a first current balancing module, which is connected in series between the positive output terminal of the DC power supply and the positive input terminal of the structure to be aged. The energy recovery intensity of the constant current source is adjusted through the first current balancing module, and current backflow is prevented.

[0007] In one embodiment of the present application, the circuit also includes a second current balancing module, the input end of the second current balancing module is connected to the positive output end of the constant current source, and the output end of the second current balancing module is connected between the output end of the first current balancing module and the structure to be aged, so as to cooperate with the first current balancing module to adjust the energy recovery intensity of the constant current source and prevent current backflow.

[0008] In one embodiment of the present application, the circuit structure of the first current balancing module is the same as that of the second current balancing module. The first current balancing module includes a diode and a current balancing resistor. The positive electrode of the diode serves as the input end of the first current balancing module, and the negative electrode is connected to one end of the current balancing resistor. The other end of the current balancing resistor serves as the output end of the first current balancing module.

[0009] In an embodiment of the present application, the circuit further includes an overcurrent protection module, which is connected in series between a connection point between the first current equalizing module and the second current equalizing module and an input end of the structure to be aged.

[0010] In an embodiment of the present application, the overcurrent protection module includes a fuse or a circuit breaker.

[0011] In one embodiment of the present application, the positive output end of the previous stage EMI filter in the aged structure is connected to the positive input end of the next stage EMI filter, and the negative output end of the previous stage EMI filter is connected to the negative input end of the next stage EMI filter.

[0012] The present application also provides a method applied to the EMI filter energy circulation electrical aging circuit, the method comprising: recovering the energy output by multiple cascaded EMI filters through a constant current source, and returning the recovered energy to the multiple cascaded EMI filters, wherein the multiple cascaded EMI filters are powered by a DC power supply.

[0013] As described above, the DC EMI filter energy circulation electrical aging circuit and method provided in the present application have the following beneficial effects.

[0014] The constant current source used has an adjustable output constant current value within a certain range. Its input energy is the output DC voltage of the DC EMI filter. Through the constant current output after isolation transformation, the energy is returned to the input end of the DC EMI filter to realize energy recovery cycle and save energy. The aging of the EMI filter in series can greatly improve the aging capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the architecture of a traditional DC EMI filter aging circuit.

[0016] Figure 2 Schematic diagram of the architecture of a DC EMI filter energy circulation electrical aging circuit in one embodiment of the present application.

[0017] Figure 3 Schematic diagram of the aging circuit structure of three EMI filters cascaded in one embodiment of the present application. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0020] The inventors have found that the traditional DC EMI filter aging method uses a method of directly adding power and load to the DC EMI filter for aging. Figure 1 Although this method is simple, it has the problem of occupying a lot of power and load. In particular, DC EMI filters often need to be aged under relatively high power supply voltage and relatively large current conditions. It takes up a lot of power and load, consumes a lot of energy, and not only wastes energy, but also increases the aging cost, which is not conducive to large-scale aging.

[0021] See also Figure 2 , Figure 2 The schematic diagram of the structure of the DC EMI filter energy circulation electric aging circuit in one embodiment of the present application. The DC EMI filter energy circulation electric aging circuit of the present application includes: a DC power supply, which is used to provide DC power; a load, which is used to provide an adjustable load resistance; a plurality of EMI filters, each of which is cascaded in sequence between the DC power supply and the load to form a structure to be aged; a constant current source, whose input end is connected to both ends of the load, the positive output end is connected between the positive output end of the DC power supply and the positive input end of the structure to be aged, and the negative output end is connected between the negative output end of the DC power supply and the negative input end of the structure to be aged, so as to recover the energy received at both ends of the load and return it to the structure to be aged, wherein the output of the constant current source is adjustable.

[0022] In one embodiment, the positive output terminal of the previous stage EMI filter in the aged structure is connected to the positive input terminal of the next stage EMI filter, and the negative output terminal of the previous stage EMI filter is connected to the negative input terminal of the next stage EMI filter.

[0023] In one embodiment, the circuit also includes a first current balancing module, which is connected in series between the positive output terminal of the DC power supply and the positive input terminal of the structure to be aged. The energy recovery intensity of the constant current source is adjusted through the first current balancing module, and current backflow is prevented.

[0024] In one embodiment, the circuit also includes a second current balancing module, the input end of the second current balancing module is connected to the positive output end of the constant current source, and the output end of the second current balancing module is connected between the output end of the first current balancing module and the structure to be aged, so as to cooperate with the first current balancing module to adjust the energy recovery intensity of the constant current source and prevent current backflow.

[0025] In one embodiment, the circuit structure of the first current balancing module is the same as that of the second current balancing module, and the first current balancing module includes a diode and a current balancing resistor, the positive electrode of the diode serves as the input end of the first current balancing module, the negative electrode is connected to one end of the current balancing resistor, and the other end of the current balancing resistor serves as the output end of the first current balancing module. The current balancing module is composed of a current balancing resistor and a diode, and the current balancing resistor is a power resistor with a small resistance value. Matching different resistance values ​​can realize the adjustment of the energy recovery cycle intensity, and the diode is used to prevent current backflow.

[0026] In one embodiment, the circuit further includes an overcurrent protection module, which is connected in series between the connection point of the first current balancing module and the second current balancing module and the input end of the structure to be aged. The overcurrent protection module can be a fuse or a circuit breaker, etc. When the current exceeds the rated current, the fuse blows or the circuit breaker disconnects to protect the safety of the aged EMI filter.

[0027] See also Figure 3 , Figure 3 This is a schematic diagram of the aging circuit structure of three EMI filter cascades in an embodiment of the present application. Specifically, taking the three EMI filter cascades as an example, the DC power supply 1 provides a DC voltage for the aged EMI filter, and its output terminal 1_OUT+ is connected to 2_IN of the first current equalizing module 2, and its output terminal 1_OUT- is connected to 401_IN- of the first EMI filter 401 and the output terminal 6_OUT- of the constant current source 6.

[0028] The first current balancing module 2 can adjust the energy recycling ratio and prevent current backflow. Its input terminal 2_IN is connected to the output terminal 1_OUT+ of the DC power supply 1, and its output terminal 2_OUT is connected to the input terminal 3_IN of the overcurrent protection 3 and the output terminal 7_OUT of the current balancing circuit 7.

[0029] The overcurrent protection module 3 provides protection for the aged EMI filter. When the current exceeds the preset value due to an unexpected situation, the fuse is blown to prevent damage to the EMI filter. Its input terminal 3_IN is connected to the output terminal 2_OUT of the first current balancing circuit 2 and the output terminal 7_OUT of the second current balancing module 7, and its output terminal 3_OUT is connected to 401_IN+ of the EMI filter 401.

[0030] EMI filter 401 is one of the EMI filters to be aged, and its input terminal 401_IN+ is connected to 3_OUT of the overcurrent protection module 3, its input terminal 401_IN- is connected to the output terminal 1_OUT- of the DC power supply 1 and the output terminal 6_OUT- of the constant current source 6, its output terminal 401_OUT+ is connected to 402_IN+ of the EMI filter 402, and its output terminal 401_OUT- is connected to 402_IN- of the EMI filter 402.

[0031] EMI filter 402 is the second EMI filter to be aged. Its input terminal 402_IN+ is connected to 401_OUT+ of EMI filter 401, its input terminal 402_IN- is connected to 401_OUT- of EMI filter 401, its output terminal 402_OUT+ is connected to 403_IN+ of EMI filter 403, and its output terminal 402_OUT- is connected to 403_IN- of EMI filter 403.

[0032] EMI filter 403 is the third EMI filter to be aged, and its input terminal 403_IN+ is connected to 402_OUT+ of EMI filter 402, its input terminal 403_IN- is connected to 402_OUT- of EMI filter 402, its output terminal 402_OUT+ is connected to 5_IN+ of load 5 and input terminal 6_IN+ of constant current source 6, and its output terminal 403_OUT- is connected to 5_IN- of load 5 and input terminal 6_IN- of constant current source 6.

[0033] Load 5 is the load resistor of the EMI filter to be aged, and its input terminal 5_IN+ is connected to the output terminal 403_OUT+ of the EMI filter 403 and the input terminal 6_IN+ of the constant current source 6, and its input terminal 5_IN- is connected to the output terminal 403_OUT- of the EMI filter 403 and the input terminal 6_IN- of the constant current source 6.

[0034] The constant current source 6 inputs a DC voltage and outputs an adjustable constant current, wherein the input terminal 6_IN+ is connected to the output terminal 403_OUT+ of the EMI filter 403 and the input terminal 5_IN+ of the load 5, the input terminal 6_IN- is connected to the output terminal 403_OUT- of the EMI filter 403 and the input terminal 5_IN- of the load 5, the output terminal 6_OUT+ is connected to the output terminal 1_OUT- of the DC power supply 1 and the input terminal 401_IN- of the EMI filter 401, and the output terminal 6_OUT- is connected to the input terminal 7_IN of the second current equalizing module 7.

[0035] The second current balancing module 7 can adjust the energy recycling ratio and prevent current backflow. Its input terminal 7_IN is connected to the output terminal 6_OUT+ of the constant current source 6, and its output terminal 7_OUT is connected to the output terminal 2_OUT of the current balancing circuit 2 and the input terminal 3_IN of the overcurrent protection module 3.

[0036] Based on the circuit of the above embodiment of the present application, the constant current source 6 is adjustable within a certain range of the output constant current value, and its input DC power supply is isolated and transformed and then outputted as a constant current, and the energy is returned to the input end of the DC EMI filter to realize the energy recovery cycle, which can save 40% of energy, and the EMI filter is connected in series with the aging to improve the aging capacity by 200%; the aging voltage and current provided by the DC EMI filter are adjustable within a certain range, which is convenient for adapting to different DC EMI filters; the energy recovery intensity can be changed by adjusting the rated resistance of the balancing resistor in the balancing module; the aging current can be adjusted by changing the resistance of the load resistor; the balancing resistor is a power resistor with a small resistance value, and different resistance values ​​are matched to realize the adjustment of the energy recovery cycle intensity, and the diode is used to prevent current backflow; the circuit can operate under the condition of -55℃~125℃.

[0037] In one embodiment, the present application also provides a method, which is applied to the aforementioned EMI filter energy circulation electrical aging circuit. The method includes recovering the energy output by multiple cascaded EMI filters through a constant current source, and returning the recovered energy to the multiple cascaded EMI filters, wherein the multiple cascaded EMI filters are powered by a DC power supply. The specific execution process has been described in detail in the signing circuit embodiment and will not be repeated here.

[0038] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A DC EMI filter energy cycle electrical aging circuit, characterized in that: The circuit comprises: A DC power supply, which is used to provide direct current; A load, which is used to provide an adjustable load resistance; A plurality of EMI filters, each of which is cascaded in sequence between the DC power supply and the load to form a structure to be aged; A constant current source, whose input end is connected to both ends of the load, whose positive output end is connected between the positive output end of the DC power supply and the positive input end of the structure to be aged, and whose negative output end is connected between the negative output end of the DC power supply and the negative input end of the structure to be aged, so as to recover the energy received at both ends of the load and return it to the structure to be aged, wherein the output of the constant current source is adjustable.

2. The EMI filter energy cycle electrical aging circuit according to claim 1, characterized in that: The circuit also includes a first current balancing module, which is connected in series between the positive output terminal of the DC power supply and the positive input terminal of the structure to be aged. The energy recovery intensity of the constant current source is adjusted through the first current balancing module, and current backflow is prevented.

3. The EMI filter energy cycle electrical aging circuit according to claim 2, characterized in that: The circuit also includes a second current balancing module, the input end of the second current balancing module is connected to the positive output end of the constant current source, and the output end of the second current balancing module is connected between the output end of the first current balancing module and the structure to be aged, so as to cooperate with the first current balancing module to adjust the energy recovery intensity of the constant current source and prevent current backflow.

4. The EMI filter energy cycle electrical aging circuit according to claim 3, characterized in that: The circuit structure of the first current balancing module is the same as that of the second current balancing module. The first current balancing module includes a diode and a current balancing resistor. The positive electrode of the diode serves as the input end of the first current balancing module, and the negative electrode is connected to one end of the current balancing resistor. The other end of the current balancing resistor serves as the output end of the first current balancing module.

5. The EMI filter energy cycle electrical aging circuit according to claim 4, characterized in that: The circuit further includes an overcurrent protection module, which is connected in series between a connection point between the first current equalizing module and the second current equalizing module and an input end of the structure to be aged.

6. The EMI filter energy cycle electrical aging circuit according to claim 5, characterized in that: The overcurrent protection module includes a fuse or a circuit breaker.

7. The EMI filter energy cycle electrical aging circuit according to any one of claims 1 to 6, characterized in that: The positive output terminal of the previous EMI filter in the structure to be aged is connected to the positive input terminal of the next EMI filter, and the negative output terminal of the previous EMI filter is connected to the negative input terminal of the next EMI filter.

8. A method for applying the EMI filter energy cycle electrical aging circuit according to any one of claims 1 to 7, characterized in that: The method comprises: After the energy output by the multiple cascaded EMI filters is recovered through a constant current source, the recovered energy is returned to the multiple cascaded EMI filters, wherein the multiple cascaded EMI filters are powered by a direct current power supply.

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