TWI596626B - Choke and emi filter with the same - Google Patents

Description

Choke and its applicable electromagnetic interference filter

This case relates to a choke, especially a choke that can be applied to a filter that receives a dual input power supply to solve electromagnetic interference and an electromagnetic interference filter to which it is applied.

With the advancement and development of science and technology, various types of electrical appliances are very common and frequently used, and the use of electrical appliances will inevitably use power supplies in order to make electrical appliances operate normally. However, when an electric appliance needs to use an AC power source for operation, it may be entrained in the current supplied by the AC power source due to the supply of the power source, the parasitic capacitance of the high-frequency transformer or other components, or the operation of the stray capacitance. With the noise current, this is the phenomenon of electromagnetic interference (EMI).

In general, the noise generated by the AC power supply includes differential mode noise and common mode noise, and the electromagnetic interference filter can be used as the first line of defense against electromagnetic radiation. The electromagnetic interference filter is mainly composed of a choke and a capacitor, wherein the choke is an inductive component for suppressing noise generation, and generally comprises at least one winding, a magnetic core group and One of the windings of the winding is wound.

Although the EMI filter can suppress the noise generation by the choke, the circuit structure of the EMI filter with the first-order filtering function has two-way filtering. The circuit can only set two independent turbulences in order to prevent the noise generated by the EMI filter receiving the dual-group power supply when receiving the dual-input power supply, that is, the dual-group power supply. In the electromagnetic interference filter, each of the chokes is connected to one of the filter circuits to suppress the noise of the power received by the corresponding filter circuit by each of the chokes.

As a result, the EMI filter requires two independent chokes to increase production costs and requires more space to accommodate two independent chokes. In addition, when the voltage values of the two sets of power sources received by the two input terminals of the electromagnetic interference filter are different, the current flowing into the choke by the positive end of each filter circuit may not be equal to the flow out of each path through the choke. The current at the negative side of the filter circuit saturates the choke in an unbalanced state, causing the impedance on the choke to become extremely small, so that the current flowing through the choke becomes very large, so that 扼The currents and other components inside the EMI filter can be burned out in an instant or not function properly.

The main purpose of the present invention is to provide a choke and an electromagnetic interference filter to which the choke is applied, wherein the choke has four windings and is directly wound on the same core group. In addition, when the choke is applied to an electromagnetic interference filter capable of receiving two sets of power supplies, two of the four sets of windings of the choke are respectively connected to the positive path of the first filter circuit of the electromagnetic interference filter. And the negative path, and the other two of the four sets of windings of the choke are respectively connected to the positive path and the negative path of the second filter circuit of the electromagnetic interference filter, and the conventionally receivable dual-group power supply is solved. The EMI filter requires two independent chokes to increase the production cost, and the EMI filter that receives the two sets of power supplies has different voltage values in the two sets of power supplies. The flow system produces saturation, resulting in chokes and EMI filters. Other components inside will be burned out or not functioning properly.

In order to achieve the above object, a preferred embodiment of the present invention provides a choke for use in an electromagnetic interference filter for suppressing electromagnetic interference. The electromagnetic interference filter has a first path filter circuit that receives the first input power source and a second path filter circuit that receives the second input power source. The choke includes a magnetic core group and four sets of windings, wherein the magnetic core group includes a first magnetic core and a second magnetic core. The first winding and the second winding are each wound directly on the first magnetic core. The third winding and the fourth winding are each wound directly on the second core. The first winding is connected in series to the first positive path of the first filter circuit, the second winding is connected in series to the second positive path of the second filter circuit, and the third winding is connected in series to the first filter circuit. In the first negative path, the fourth winding is connected in series to the second negative path of the second filter circuit.

To achieve the above objective, the present invention further provides an electromagnetic interference filter that receives a first input power source and a second input power source. The electromagnetic interference filter includes a first filter circuit, a second filter circuit, and a first choke. The first filter circuit is configured to suppress electromagnetic interference of the first input power source and has a first positive path and a first negative path. The second filter circuit is configured to suppress electromagnetic interference of the second input power source and has a second positive path and a second negative path. The first choke includes: a first core group including a first core and a second core; the first winding and the second winding are each directly wound on the first core; the third winding and the fourth winding Each of them is directly wound on the second magnetic core. The first winding is connected in series to the first positive path, the second winding is connected in series to the second positive path, the third winding is connected in series to the first negative path, and the fourth winding is connected in series to the second negative path. on.

In order to achieve the above object, a preferred embodiment of the present invention is a choke which is applied to an electromagnetic interference filter for suppressing electromagnetic interference. Electromagnetic interference filter And receiving a first path filter circuit of the first input power source and a second path filter circuit receiving the second input power source. The choke includes: a first core group including a first core and a second core; the first winding and the second winding are each directly wound on the first core; the third winding and the fourth winding are Each of which is directly wound on the second magnetic core; the second magnetic core group includes a third magnetic core and a fourth magnetic core; the fifth winding and the sixth winding are each directly wound on the third magnetic core; the seventh winding and The eighth windings are each wound directly on the fourth core. The first winding and the fifth winding are connected in series, and the first winding and the fifth winding are connected to the first positive path of the first filter circuit, the second winding and the sixth winding are connected in series, and the second The winding and the sixth winding are connected to the second positive path of the second filter circuit, the third winding and the seventh winding are connected in series, and the third winding and the seventh winding are connected to the first negative path of the first filter circuit The fourth winding and the eighth winding are connected in series, and the fourth winding and the eighth winding are connected to the second negative path of the second filtering circuit.

1‧‧‧Electromagnetic interference filter

2‧‧‧First path filter circuit

20, 30‧‧‧ Transient voltage suppression circuit

3‧‧‧Secondary filter circuit

4‧‧‧ first current collector

40, 60‧‧‧First core group

400, 600‧‧‧ first core

401, 601‧‧‧second core

41, 62‧‧‧ first winding

42, 63‧‧‧ second winding

43, 64‧‧‧ third winding

44, 65‧‧‧ fourth winding

5‧‧‧Second current collector

50, 61‧‧‧second core group

51, 66‧‧‧ fifth winding

52, 67‧‧‧ sixth winding

53, 68‧‧‧ seventh winding

54, 69‧‧‧ eighth winding

6‧‧‧Current

610‧‧‧third core

611‧‧‧four core

T ₁ to T ₈ , T ₁ ' to T ₈ '‧‧‧ independent pins

T ₉ ' to T ₁₂ '‧‧‧ shared pin

T ₉₀ ', T ₉₁ ', T ₁₀₀ ', T ₁₀₁ ', T ₁₁₀ ', T ₁₁₁ ', T ₁₂₀ ', T ₁₂₁ '‧‧‧ sub-pins

P ₁ ‧‧‧First positive path

P ₂ ‧‧‧First negative path

P ₃ ‧‧‧Second positive path

P ₄ ‧‧‧second negative path

V ₁ ‧‧‧first input power supply

V ₂ ‧‧‧second input power supply

T _in1 ‧‧‧ first positive input

T _in2 ‧‧‧first negative input

T _in3 ‧‧‧second positive input

T _{in4 ‧‧‧second} negative input

T _out1 ‧‧‧first positive output

T _out2 ‧‧‧first negative output

T _{out3 ‧‧‧second} positive output

T _out4 ‧‧‧second negative output

C ₁ to C ₁₂ ‧‧‧first to twelfth filter capacitors

C ₁₃ to C ₁₄ ‧‧‧First to second jumper capacitors

G‧‧‧Common

D‧‧‧Transient voltage suppressor

Fig. 1 is a circuit diagram showing the structure of an electromagnetic interference filter according to a preferred embodiment of the present invention.

Fig. 2A is a perspective view showing the combined structure of the choke shown in Fig. 1.

Fig. 2B is a perspective view showing the exploded structure of the choke shown in Fig. 2A.

Fig. 2C is a perspective view showing the choke shown in Fig. 2A when a part of the components are combined.

Fig. 3 is a circuit diagram showing another variation of the electromagnetic interference filter shown in Fig. 1 of the present invention.

Figure 4A is a perspective view showing the combined structure of the choke of another preferred embodiment of the present invention. intention.

Fig. 4B is a perspective view showing the exploded structure of the choke shown in Fig. 4A.

Fig. 4C is a perspective view showing the choke shown in Fig. 4B when a part of the components are combined.

Fig. 5 is an electromagnetic diagram when the choke shown in Fig. 4A is applied to the electromagnetic interference filter shown in Fig. 1 instead of the first choke and the second choke shown in Fig. 1. Schematic diagram of part of the circuit structure of the interference filter.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in various aspects, and is not to be construed as a limitation.

Please refer to FIG. 1 and FIG. 2A to FIG. 2C. FIG. 1 is a schematic diagram showing the circuit structure of the electromagnetic interference filter of the preferred embodiment of the present invention, and FIG. 2A is a combination of the chokes shown in FIG. FIG. 2B is a perspective view showing the exploded structure of the choke shown in FIG. 2A, and FIG. 2C is a perspective view showing the choke shown in FIG. 2A when a part of the components are combined. The electromagnetic interference filter 1 of the preferred embodiment of the present invention receives a first input power source V ₁ and a second input power source V ₂ and filters out electromagnetic interference in the first input power source V ₁ and the second input power source V ₂ . The first input power source V ₁ and the second input power source V ₂ after filtering the electromagnetic interference are supplied to at least one power conversion circuit (not shown) connected to the output end of the electromagnetic interference filter 1 , and the electromagnetic interference filter 1 A first path filter circuit 2, a second path filter circuit 3 and a first choke unit 4 are included. The first filter circuit 2 receives the first input power V ₁ and suppresses electromagnetic interference of the first input power V ₁ and includes a first positive path (positive power transmission path) P ₁ and a first negative path ( the negative terminal of power transmission paths) P _2, the first line by a first filter circuit 2 path P _n-1 one T _in1 first positive and the first negative input terminal of one of the path P, a first negative input terminal ₂ receives the first T _in2 an input power source V _1, and transmits _a path P ₂ and the first negative first input a first positive power supply path P by V _1. The second filter circuit 3 receives the second input power V ₂ and suppresses the electromagnetic interference of the second input power V ₂ , and includes a second positive path P ₃ and a second negative path P ₄ , and the second filter circuit 3 based second positive path P by a second one of the _three positive input terminal and a second negative T _in3 one path P ₄ T _in4 second negative input terminal receiving a second input power source V _2, and by a second path P n ₃ and the second negative path P ₄ transmits the second input power source V ₂ .

The first choke 4 includes a first core group 40, a first winding 41, a second winding 42, a third winding 43, and a fourth winding 44. The first magnetic core group 40 may be a UU-type magnetic core group, but the first magnetic core group 40 includes a first magnetic core 400 and a second magnetic core 401. The first winding 41 and the second winding 42 are directly wound on the first magnetic core 400 separately from each other, and the third winding 43 and the fourth winding 44 are directly wound on the second magnetic core 401 separately from each other. In addition, the first winding 41 is connected in series to the first positive path P ₁ of the first path filter circuit 2, and the second winding 42 is connected in series to the second positive path P ₃ of the second path filter circuit 3, and the third winding lines 43 are connected in series to the first filter circuit path P 2 of the first negative on the path _2, the fourth winding 44 are connected in series based on the negative path of the second passage of the second filter circuit 3 P _4, the first winding 41 so the actual based on a first input receiving the positive voltage supply V _1, a second winding 42 is actually provided for receiving a second input voltage is a positive power source V _2, the third winding 43 is actually provided for receiving a first input of the negative voltage supply V _1, four windings 44 was in fact receives a negative voltage V ₂ of the second power supply input.

In some embodiments, the first winding 41, the second winding 42, the first of the first choke 4 The three windings 43 and the fourth windings 44 (which may be, but not limited to) are formed by winding copper sheets, thereby improving the withstand voltage, flow resistance and heat dissipation efficiency of the first windings 41 to the fourth windings 44, thereby making the first The choke 4 can be applied to applications requiring high current or high power output, wherein the copper sheet is preferably provided with an insulating layer. Alternatively, the copper sheet can be wound together with the attached insulating sheet or insulating tape. In addition, since the first choke 4 of the embodiment of the present invention directly wraps the first winding 41, the second winding 42, the third winding 43, and the fourth winding 44 to the first core 400 of the first core group 40, respectively And the second core 401, so that the conventional choke device does not need to have a bobbin to wind the winding, so the first choke 4 of the present invention can reduce the production cost by saving the bobbin. At the same time, when the first choke 4 is applied to an application for outputting a large current or a high power, it can be avoided that the bobbin is burnt due to high voltage resistance or high current resistance.

In this embodiment, the first choke 4 further has a plurality of independent pins, for example, eight independent pins T ₁ -T ₈ shown in FIGS. 2A to 2C , wherein two independent pins T ₁ , T _{The two} series are respectively connected to the two outgoing ends of the first winding 41, and the two independent pins T ₃ and T ₄ are respectively connected to the two outgoing ends of the second winding 42 , and the two independent pins T ₅ and T ₆ are respectively connected. They are respectively connected to the two outgoing ends of the third winding 43, and the two independent pins T ₇ and T ₈ are respectively connected to the two outgoing ends of the fourth winding 44.

Referring to FIG. 1 again, in the embodiment, the electromagnetic interference filter 1 further has at least one first filter capacitor C ₁ , at least one second filter capacitor C ₂ , at least one third filter capacitor C _{3 ,} and at least one The fourth filter capacitor C ₄ , for example, as shown in FIG. 1 , the electromagnetic interference filter 1 may have four first filter capacitors C ₁ , four second filter capacitors C ₂ , four third filter capacitors C _{3 ,} and four Four filter capacitors C ₄ . One end of each of the first filter capacitors C ₁ is connected to the first positive path P ₁ and is located between the first winding 41 and the first positive input terminal T _in1 , and the other end of each of the first filter capacitors C ₁ is connected to There is a total of G, such as a ground. One end of each second filter capacitor C ₂ is connected to the first negative path P ₂ and is located between the third winding 43 and the first negative input terminal T _in2 , and the other end of each second filter capacitor C ₂ is connected to Common terminal G. One end of each third filter capacitor C ₃ is connected to the second positive path P ₃ and is located between the second winding 42 and the second positive input terminal T _in3 , and the other end of each third filter capacitor C ₃ is connected to Common terminal G. One end of each fourth filter capacitor C ₄ is connected to the second negative path P ₄ and is located between the fourth winding 44 and the second negative input terminal T _in4 , and the other end of each fourth filter capacitor C ₄ is connected to Common terminal G. The first to fourth filter capacitors C ₁ to C ₄ are used for filtering.

In addition, the electromagnetic interference filter 1 further has a fifth filter capacitor C ₅ and a sixth filter capacitor C ₆ . One end of the fifth filter capacitor C ₅ is connected to the first positive path P ₁ and is located between the first positive input terminal T _in1 and the first winding 41 , and the other end of the fifth filter capacitor C ₅ is connected to the first negative path P ₂ is located between the first negative input terminal T _in2 and the third winding 43. One end of the sixth filter capacitor C ₆ is connected to the second positive path P ₃ and is located between the second positive input terminal T _in3 and the second winding 42 , and the other end of the sixth filter capacitor C ₆ is connected to the second negative path P ₄ is located between the second negative input terminal T _in4 and the fourth winding 44. The fifth filter capacitor C ₅ and the sixth filter capacitor C ₆ are used for filtering.

Furthermore, as shown in FIG. 1, the electromagnetic interference filter 1 of the present invention has a second choke 5 having the same structure as that of the first choke 4, in other words, the second choke 5 includes two a second core group 50, a fifth winding 51, a sixth winding 52, a seventh winding 53, and an eighth winding 54 of the magnetic core, wherein the fifth winding 51 and the sixth winding 52 are the same as the first The winding 41 and the second winding 42 are wound on the magnetic core of one of the core groups 50 separately from each other, and the seventh winding 53 and the eighth winding 54 are separated from the third winding 43 and the fourth winding 44 to be separated from each other. Wrapped around another core of the core set 50. Fifth winding 51 connected to a first positive line path P ₁ is connected in series with a first winding 41, and is connected between the first winding 41 and a first one of the path P _n-1 first positive output terminal T _out1. The sixth winding 52 is connected to the second positive path P ₃ and connected in series with the second winding 42 and is connected between the second winding 42 and one of the second positive output terminals T _{out3 of the} second positive path P ₃ . The seventh winding 53 is connected to the first negative path P ₂ and connected in series with the third winding 43 and is connected between the third winding 43 and one of the first negative output terminals T _{out2 of the} first negative path P ₂ . The eighth winding 54 is connected to the second negative path P ₄ and connected in series with the fourth winding 44 and is connected between the fourth winding 44 and one of the second negative output terminals T _{out4 of the} second negative path P4. The structure of the second choke 5 is the same as that of the first choke 4, so the detailed structure of the second choke 5 will not be described herein. The electromagnetic interference filter 1 of the present invention constitutes a filter having a two-stage filtering function by the first choke 4 and the second choke 5.

In other embodiments, the electromagnetic interference filter 1 further has a seventh filter capacitor C ₇ and an eighth filter capacitor C ₈ . One end of the seventh filter capacitor C ₇ is connected to the first positive path P ₁ and is located between the first winding 41 and the fifth winding 51 , and the other end of the seventh filter capacitor C ₇ is connected to the first negative path P ₂ and Located between the third winding 43 and the seventh winding 53. One end of the eighth filter capacitor C ₈ is connected to the second positive path P ₃ and is located between the second winding 42 and the sixth winding 52, and the other end of the eighth filter capacitor C ₈ is connected to the second negative path P ₄ and Located between the fourth winding 44 and the eighth winding 54. The seventh filter capacitor C ₇ and the eighth filter capacitor C ₈ are used for filtering.

In addition, the electromagnetic interference filter 1 may also have a ninth filter capacitor C ₉ , a tenth filter capacitor C ₁₀ , an eleventh filter capacitor C _{11 ,} and a twelfth filter capacitor C ₁₂ . One end of the ninth filter capacitor C ₉ is connected to the first positive path P ₁ and is located between the first winding 41 and the fifth winding 51 , and the other end of the ninth filter capacitor C ₉ is connected to the common terminal G. One end of the tenth filter capacitor C ₁₀ is connected to the first negative path P ₂ and is located between the third winding 43 and the seventh winding 53 , and the other end of the tenth filter capacitor C ₁₀ is connected to the common terminal G . One end of the eleventh filter capacitor C ₁₁ is connected to the second positive path P ₃ and is located between the second winding 42 and the sixth winding 52 , and the other end of the eleventh filter capacitor C ₁₁ is connected to the common terminal G. One end of the twelfth filter capacitor C ₁₂ is connected to the second negative path P ₄ and is located between the fourth winding 44 and the eighth winding 54 , and the other end of the twelfth filter capacitor C ₁₂ is connected to the common terminal G. The ninth filter capacitor C ₉ to the twelfth filter capacitor C ₁₂ are used for filtering.

As can be seen from the above, since the first choke 4 of the present case directly wraps the first winding 41 to the fourth winding 44 directly on the first core 400 and the second core 401 of the single first core group 40, In this case, the electromagnetic interference filter 1 capable of receiving the first input power source V ₁ and the second input power source V ₂ can use only a single group of the chokes 4 to be respectively connected to the first path filter circuit by the choke 4 The first positive path P ₁ of the first positive path P ₁ and the first negative path P ₂ and the third negative winding 43 are respectively connected to the second positive path P ₃ and the second negative path P ₄ of the second path filter circuit 3 The second winding 42 and the fourth winding 44 filter out noise, so two sets of independent chokes are used to filter out the noise compared to the conventional electromagnetic interference filter that receives the two-group power supply and is a first-order filtering function. The electromagnetic interference filter 1 of the present invention can reduce the production cost of the electromagnetic interference filter 1 by using a single set of the chokes 1 and reducing the set of core groups by using two sets of independent chokes.

In addition, since the choke 4 of the present case directly winds the first winding 41 to the fourth winding 44 on the first core group 40, the first input power source V is received by the first winding 41 to the fourth winding 4. ₁ and the second input power source V ₂ , whereby the positive end of the electromagnetic interference filter 1 can be made if the voltage value difference is generated between the first input power source V ₁ and the second input power source V ₂ power flows into a single set of core 40 of a first sum of the first input power is actually V ₁ and V ₂ of the second input power source, and a first magnetic core assembly 40 via a single effluent EMI filter end of the negative power is also The sum of the first input power source ₁ and the second input power source V ₂ , that is, the power flowing into the single first core group 40 is equal to the power flowing out of the single first core group 40, so that the first core group can be avoided. 40 is saturated when the first input power source V ₁ and the second input power source V _{2 are} unbalanced to generate a voltage value difference, thereby solving the problem that the first choke 4 and other components inside the electromagnetic interference filter 1 are instantaneously burned or It is a problem that cannot work properly.

In some embodiments, as shown in FIG. 3, a first negative output path P ₂ of the first negative terminal and a second negative T _out2 path P ₄ of the second negative output terminal T _out4 more may be linked to form a short circuit condition, At this time, a first passage and a second channel 2 filter circuit filtering circuit 3 is not independent of the insulation circuit, so that when, for example, the first two path filter circuit receiving a first voltage less than the input power source V _1, a second filter path The voltage of the second input power source V ₂ received by the circuit 3 can be shared by the first path filter circuit 2, and when, for example, the voltage of the second input power source V ₂ received by the second path filter circuit 3 is insufficient, the first input voltage of the first power source V 2 received road filter circuit ₁ can be shared with the second passage 3 using filtering circuit.

In addition, when the difference between the voltage value of the first input power source V _{1 and} the voltage value of the second input power source V ₂ is unbalanced, in order to enhance the filtering effect in this state, in other embodiments, as shown in FIG. 1 and As shown in FIG. 3 , the EMI filter 1 further has a first jumper capacitor C ₁₃ and a second jumper capacitor C ₁₄ , wherein the first jumper capacitor C ₁₃ is connected across the first filter circuit 2 . the first path P _{n. 1} and n of the second path of the second passage between the filter circuit 3 P _3, i.e. a first capacitor C connected across the two ends ₁₃ with the first positive and the second path P _{n. 1} path P ₃ , the second jumper capacitor C ₁₄ is connected between the first negative path P ₂ of the first filter circuit ₂ and the second negative path P ₄ of the second filter circuit 3, that is, the second jumper Both ends of the capacitor C ₁₄ are connected to the first negative path P ₂ and the second negative path P _{4 ,} respectively.

In the above embodiments, the first filter capacitor C ₁ to the fourth filter capacitor C ₄ , the ninth filter capacitor C ₉ to the twelfth filter capacitor C ₁₂ are coupled to the first choke 4 and/or the second clamp The flow device 5 interacts to filter out common mode noise, for example, filtering noise of 30 MHz to 50 MHz, and the fifth capacitor C ₅ to the eighth capacitor C ₈ , the first jumper capacitor C ₁₃ and the second jumper Capacitor C ₁₄ is used to filter differential mode noise, such as 150K~10MHZ noise, so the fifth capacitor C ₅ to the eighth capacitor C ₈ , the first jumper capacitor C ₁₃ and the second jumper capacitor C ₁₄ a first filter capacitor capacitance values based fourth filter capacitor a C ₁ to C _4, C ₉ ninth to twelfth filter capacitor filter capacitor C ₁₂ is relatively larger than the capacitance value.

In some embodiments, as shown in FIGS. 1 and 3, the first filter circuit 2 and the second filter circuit 3 each have a transient voltage suppression circuit 20, 30, and the transient voltage suppression circuit 20 is connected to the first A positive path P ₁ and a first negative path P ₂ are connected adjacent to the first positive output terminal T _out1 and the first negative output terminal T _out2 , and the transient voltage suppression circuit 30 is connected to the second positive path P ₃ and the second negative path P ₄ are connected adjacent to the second positive output terminal T _out3 and the second negative output terminal T _out4 . In addition, the transient voltage suppression circuits 20 and 30 are respectively composed of two Transient Voltage Suppressors (TVS) D connected in series to suppress the surge, that is, when the first input power source V ₁ and V ₂ of the second input power lines stably input EMI filter 1, a transient voltage suppression circuit 20, 30 presents a high impedance state electromagnetic interference filter, however, when the first input and the second input power supply V ₁ V _When the voltage of ₂ is instantaneously increased and a surge occurs, the voltage value is rapidly increased, so that the impedance values of the transient voltage suppression circuits 20 and 30 are rapidly decreased, and a short circuit state is formed, thereby providing a low impedance path, thereby providing a surge. The voltage current can be conducted away without affecting the electromagnetic interference filter 1, and the effect of protecting the electromagnetic interference filter 1 is achieved.

Please refer to Figures 4A to 4C, wherein Figure 4A is a turbulence of another preferred embodiment of the present invention. FIG. 4B is a perspective view showing the exploded structure of the choke shown in FIG. 4A, and FIG. 4C is a perspective view showing the choke shown in FIG. 4B when a part of the components are combined. The choke 6 of the present embodiment includes a first core group 60, a second core group 61, a first winding 62, a second winding 63, a third winding 64, a fourth winding 65, a fifth winding 66, and a The sixth winding 67, the seventh winding 68 and the eighth winding 69, wherein the first core group 60 and the second core group 61 are respectively UU-type core groups, but not limited thereto, and the first core The group 60 includes a first core 600 and a second core 601, and the second core group 61 includes a third core 610 and a fourth core 611. The first winding 62 and the second winding 63 are directly wound on the first magnetic core 600 separately from each other, and the third winding 64 and the fourth winding 65 are directly wound on the second magnetic core 601 separately from each other, and the fifth winding 66 The sixth winding 67 is directly wound on the third core 610 separately from each other, and the seventh winding 68 and the eighth winding 69 are directly wound on the fourth core 611 separately from each other.

In addition, the choke 6 of the embodiment further has a plurality of independent pins, such as eight independent pins T ₁ ' to T ₈ ' shown in FIGS. 4A to 4C, and a plurality of shared pins, for example, the 4A. 4 shared pin T ₉ ' to T ₁₂ ', wherein the independent pin T ₁ ' is connected to one of the outlet ends of the first winding 62, and the independent pin T ₂ ' is connected to the second winding 63 one of the outlet ends is connected, the independent pin T ₃ ' is connected to one of the outlet ends of the third winding 64, and the independent pin T ₄ ' is connected to one of the outlet ends of the fourth winding 65, and the independent pin T ₅ 'end of one line 66 connected to the outlet fifth winding, independent pin T _6' connected to the outlet end of one line 67 sixth coils, an independent pin T ₇ 'lines and one of the seventh winding line 68 The end connection, the independent pin T ₈ ' is connected to one of the output ends of the eighth winding 69, the common pin T ₉ ' is connected to the other end of the first winding 62 and the other end of the fifth winding 66 The terminal connection, the shared pin T ₁₀ ' is connected to the other outgoing end of the second winding 63 and the other outgoing end of the sixth winding 67, and the shared pin T ₁₁ ' is connected to the other of the third winding 64 Line end and seventh winding 68 The other end is connected to the outlet, a common pin T ₁₂ 'and another line of the fourth winding 65 and the other end of the eighth line of the winding 69 connected to the outlet end.

In the above embodiment, the shared pin T ₉ ' is composed of two sub-pins T ₉₀ ′ and T ₉₁ ′ which are connectable to each other, and the shared pin T ₁₀ ′ is composed of two sub-pins T _{100 that} can be connected to each other. 'and T ₁₀₁ ', the shared pin T ₁₁ ' is composed of two sub-pins T ₁₁₀ ' and T ₁₁₁ ' that can be connected to each other, and the common pin T ₁₂ ' is composed of two sub-pins that can be connected to each other. T ₁₂₀ ' and T ₁₂₁ ' are formed, wherein the sub-pins T ₉₀ ′ and T ₉₁ ′ are respectively connected to the other outgoing end of the first winding 62 and the other outgoing end of the fifth winding 66, and the sub-pins T ₁₀₀ 'and T ₁₀₁ ' are respectively connected to the other outgoing end of the second winding 63 and the other outgoing end of the sixth winding 67, and the sub-pins T ₁₁₀ ' and T ₁₁₁ ' are respectively connected to the third winding 64. The other outgoing end and the other outgoing end of the seventh winding 68 are connected, and the sub-pins T ₁₂₀ ′ and T ₁₂₁ ′ are respectively connected to the other outgoing end of the fourth winding 65 and the other of the eighth winding 69 The outlet is connected.

The following will be further illustrated in Figure 5. When the choke shown in FIG. 4A is used instead of the first choke and the second choke shown in FIG. 1 and applied to the electromagnetic interference filter shown in FIG. 1, as shown in FIG. The electromagnetic interference filter is actually similar to the circuit structure of the electromagnetic interference filter shown in FIG. 1 , so the structure and function of the components are represented by the same symbols, and the electromagnetic interference filter of FIG. 5 will not be described again. Circuit components. Please refer to Figure 5 and cooperate with Figures 4A to 4C. Figure 5 is a diagram showing the choke shown in Figure 4A instead of the first choke and the second choke shown in Figure 1. 1 is a schematic diagram of a part of the circuit structure of the electromagnetic interference filter in the electromagnetic interference filter shown in FIG. When the choke 6 of the present embodiment is applied to the electromagnetic interference filter 1 shown in FIG. 1 instead of the first choke 4 and the second choke 5, it also constitutes the electromagnetic interference filter as shown in FIG. In the case of the device 1, the first winding 62 and the fifth winding 66 are connected in series, and the first winding 62 and the fifth winding 66 are connected to the first positive path P ₁ of the first filter circuit 2, and the second winding 63 And the sixth winding 67 is connected in series, and the second winding 63 and the sixth winding 67 are connected to the second positive path P ₃ of the second filter circuit 2, and the third winding 64 and the seventh winding 68 are connected in series, and the seventh winding and the third winding 64 and a first negative line 68 of the first path P 2 of path filter circuit ₂ is connected to the fourth winding 65 and winding 69 an eighth lines are connected in series, the fourth winding 65 and winding 69 and eighth lines It is connected to the second negative path P _{4 of the} second path filter circuit 3.

Since the choke 6 of the present embodiment is composed of two sets of core groups 60, 61 and eight sets of windings, that is, the first winding 62 to the eighth winding 69 are directly combined, and the first winding 62 to the fourth winding 65 are arranged. Wrapped around the first core group 60, the fifth winding 66 to the eighth winding 69 are wound around the second core group 61, so that when the choke 6 is applied to the electromagnetic interference filter 1, the electromagnetic The interference filter 1 constitutes a filter having a two-stage filtering function, that is, the first choke 4 and the second choke 5 shown in FIG. 1 can cause the electromagnetic interference filter 1 to have a two-order filtering function. The effect of the filter is the same, and since the choke 6 of the present embodiment is a single independent component, the installation and arrangement are compared to the first choke 4 and the second choke using two separate components. Device 5 is more convenient. In addition, the first choke 4 and the second choke 5 shown in FIG. 1 respectively have eight independent pins, that is, the total number of the pins is sixteen, since the choke 6 of the present case only There are eight independent pins and four common pins, that is, the total number of the pins is twelve, so the choke 6 of the embodiment is also more convenient in the installation setting.

In summary, the present invention provides a choke and an electromagnetic interference filter to which the same is applied, wherein the chokes directly wind the first to fourth windings on a single core group, and when applied to the receiving dual group When the power is in the electromagnetic interference filter, the first of the choke The winding to the fourth winding system are respectively connected to different power transmission paths in the electromagnetic interference filter to receive the first input power and the second input power, so two sets of electromagnetic interference filters are required to receive the two sets of power sources. Independent choke to filter out noise, the electromagnetic interference filter of this case can not only reduce the production cost by using only a single group of chokes with a set of core groups, and the first one received by the electromagnetic interference filter When there is an imbalance between the input power source and the second input power source and the voltage value difference, the core group of the choke can also avoid saturation, and the choke and other components inside the electromagnetic interference filter will not be A situation in which the core group is saturated and burned or is not functioning properly.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

1‧‧‧Electromagnetic interference filter

2‧‧‧First path filter circuit

20, 30‧‧‧ Transient voltage suppression circuit

3‧‧‧Secondary filter circuit

4‧‧‧ first current collector

40‧‧‧First core group

41‧‧‧First winding

42‧‧‧second winding

43‧‧‧ Third winding

44‧‧‧fourth winding

5‧‧‧Second current collector

50‧‧‧Second core group

51‧‧‧ fifth winding

52‧‧‧ sixth winding

53‧‧‧ seventh winding

54‧‧‧ eighth winding

P ₁ ‧‧‧First positive path

P ₂ ‧‧‧First negative path

P ₃ ‧‧‧Second positive path

P ₄ ‧‧‧second negative path

V ₁ ‧‧‧first input power supply

V ₂ ‧‧‧second input power supply

T _in1 ‧‧‧ first positive input

T _in2 ‧‧‧first negative input

T _in3 ‧‧‧second positive input

T _{in4 ‧‧‧second} negative input

T _out1 ‧‧‧first positive output

T _out2 ‧‧‧first negative output

T _{out3 ‧‧‧second} positive output

T _out4 ‧‧‧second negative output

T ₁ to T ₈ ‧‧‧ independent pins

C ₁ to C ₁₂ ‧‧‧first to twelfth filter capacitors

C ₁₃ to C ₁₄ ‧‧‧First to second jumper capacitors

G‧‧‧Common

D‧‧‧Transient voltage suppressor

Claims (20)

A choke device for use in an electromagnetic interference filter for suppressing electromagnetic interference, wherein the electromagnetic interference filter has a first path filter circuit for receiving a first input power source and a second input power source for receiving a second input power source a filter circuit, the choke includes: a core group including a first core and a second core; a first winding and a second winding, each of which is directly wound on the first core; And a third winding and a fourth winding are respectively wound directly on the second magnetic core; wherein the first winding is connected in series to one of the first positive paths of the first filtering circuit, the second The winding is connected in series to one of the second positive paths of the second filtering circuit, the third winding is connected in series to one of the first negative paths of the first filtering circuit, and the fourth winding is connected in series The second filter circuit is on a second negative path. The choke of claim 1, wherein the first positive path of the first filter circuit and the first negative path receive and transmit the first input power, the second filter circuit The second positive path and the second negative path receive and transmit the second input power. The choke according to claim 1, wherein the magnetic core group is a UU type magnetic core group. The choke of claim 1, wherein the first winding, the second The winding, the third winding and the fourth winding are respectively formed of a copper sheet, wherein the copper sheet has an insulating layer, or the copper sheet is wound together with an insulating sheet or an insulating tape. The choke of claim 1, further comprising eight independent pins, wherein the two outlet ends of the first winding, the second winding, the third winding and the fourth winding are respectively Two independent ones of the eight independent pins are respectively connected. An electromagnetic interference filter receives a first input power and a second input power, the electromagnetic interference filter includes: a first path filter circuit for suppressing electromagnetic interference of the first input power source, and having a first a positive path and a first negative path; a second filter circuit for suppressing electromagnetic interference of the second input power source, and having a second positive path and a second negative path; and a first choke, The method includes: a first magnetic core group including a first magnetic core and a second magnetic core; a first winding and a second winding respectively wound directly on the first magnetic core; and a third winding and a fourth winding, each of which is directly wound on the second magnetic core; wherein the first winding is connected in series to the first positive path, and the second winding is connected in series to the second positive path, the third The winding system is connected in series to the first negative path, and the fourth winding is connected in series to the second negative path. The EMI filter of claim 6, wherein the first filter circuit is configured by a first positive input terminal of the first positive path and a first negative input terminal of the first negative path Receiving the first input power, the second filter circuit borrowing The second input power is received by one of the second positive input and the second negative input of the second negative path. The electromagnetic interference filter of claim 7, further comprising: at least one first filter capacitor, one end of the first filter capacitor being connected to the first positive path and located at the first winding and the first Between a positive input terminal, the other end of the first filter capacitor is connected to a common terminal; at least one second filter capacitor, one end of the second filter capacitor is connected to the first negative path and located at the third winding And the other end of the second filter capacitor is connected to the common terminal; at least a third filter capacitor, one end of the third filter capacitor is connected to the second positive path and located Between the second winding and the second positive input terminal, the other end of the third filter capacitor is connected to the common terminal; and at least one fourth filter capacitor, one end of the fourth filter capacitor is connected to the first The second negative path is located between the fourth winding and the second negative input terminal, and the other end of the fourth filter capacitor is connected to the common terminal. The electromagnetic interference filter of claim 7, further comprising: a fifth filter capacitor, one end of the fifth filter capacitor being connected to the first positive path and located at the first positive input terminal and the Between the first windings, the other end of the fifth filter capacitor is connected to the first negative path and between the first negative input terminal and the third winding; and a sixth filter capacitor, the sixth filter capacitor One end is connected to the second positive path and is located between the second positive input end and the second winding, and the other end of the sixth filter capacitor is connected to the second negative path and located at the second negative input terminal and Between the fourth windings. An electromagnetic interference filter according to claim 6, which further comprises a second a second choke comprising: a second core group comprising two magnetic cores; a fifth winding and a sixth winding each wound directly on one of the second core groups And a seventh winding and an eighth winding are respectively wound directly on the other magnetic core of the second magnetic core group; wherein the fifth winding is connected in series to the first positive path The sixth winding is connected in series to the second positive path, the seventh winding is connected in series to the first negative path, and the eighth winding is connected in series to the second negative path. The EMI filter of claim 10, wherein the fifth winding is connected between the first winding and a first positive output of the first positive path, the sixth winding is connected to Between the second winding and a second positive output of the second positive path, the seventh winding is coupled between the third winding and a first negative output of the first negative path, the eighth A winding is coupled between the fourth winding and a second negative output of the second negative path. The EMI filter of claim 10, further comprising: a seventh filter capacitor, one end of the seventh filter capacitor being connected to the first positive path and located at the first winding and the fifth Between the windings, the other end of the seventh filter capacitor is connected to the first negative path and between the third winding and the seventh winding; and an eighth filter capacitor, one of the eighth filter capacitors is connected The second positive path is located between the second winding and the sixth winding, and the other end of the eighth filter capacitor is connected to the second negative path and between the fourth winding and the eighth winding. The electromagnetic interference filter according to claim 10, further comprising: a ninth filter capacitor, one end of the ninth filter capacitor is connected to the first positive path and located between the first winding and the five windings, and the other end of the ninth filter capacitor is connected to a common terminal; a tenth filter capacitor, one end of the tenth filter capacitor is connected to the first negative path and located between the third winding and the seven windings, and the other end of the tenth filter capacitor is connected to the common terminal; An eleventh filter capacitor, one end of the eleventh filter capacitor is connected to the second positive path and located between the second winding and the sixth winding, and the other end of the eleventh filter capacitor is connected to the And a twelfth filter capacitor, one end of the twelfth filter capacitor is connected to the second negative path and located between the fourth winding and the eighth winding, and the other end of the twelfth filter capacitor Connected to the common terminal. The electromagnetic interference filter of claim 6, wherein the first negative path is connected to the second negative path. The electromagnetic interference filter of claim 6, further comprising: a first jumper capacitor connected across the first positive path and the second positive path; and a second jumper capacitor Crossing between the first negative path and the second negative path. The EMI filter of claim 6, wherein the first filter circuit and the second filter circuit each have a transient voltage suppression circuit, wherein the transient voltage of the first filter circuit The suppressor is connected between the first positive path and the first negative path, and the transient voltage suppressor of the second filter circuit is connected between the second positive path and the second negative path. An electromagnetic interference filter according to claim 16, wherein each of the transients The voltage suppression circuit consists of two transient voltage suppressors connected in series. A choke device for use in an electromagnetic interference filter for suppressing electromagnetic interference, wherein the electromagnetic interference filter has a first path filter circuit for receiving a first input power source and a second input power source for receiving a second input power source The circuit filter circuit includes: a first magnetic core group including a first magnetic core and a second magnetic core; a first winding and a second winding, each of which is directly wound around the first magnetic core a third winding and a fourth winding are each directly wound on the second magnetic core; a second magnetic core group including a third magnetic core and a fourth magnetic core; a fifth winding and a a sixth winding, each of which is directly wound on the third magnetic core; and a seventh winding and an eighth winding, each of which is directly wound on the fourth magnetic core; wherein the first winding and the fifth winding Connected in series, and the first winding and the fifth winding are connected to a first positive path of the first filter circuit, the second winding and the sixth winding are connected in series, and the second winding and the a sixth winding system and one of the second filtering circuits a path connecting, the third winding and the seventh winding are connected in series, and the third winding and the seventh winding are connected to a first negative path of the first path filter circuit, the fourth winding and the eighth The windings are connected in series, and the fourth winding and the eighth winding are connected to a second negative path of the second filtering circuit. The choke of claim 18, further comprising four common pins, wherein one end of the first winding and one end of the fifth winding, one of the second windings And one end of the sixth winding, one end of the third winding, and one end of the seventh winding, one end of the fourth winding, and one end of the eighth winding are connected to one of the four common pins Should be shared. The choke of claim 19, further comprising eight independent pins, wherein the other end of the first winding, the other end of the second winding, the other end of the third winding, the first The other end of the four windings, the other end of the fifth winding, the other end of the sixth winding, the other end of the seventh winding, and the other end of the eighth winding are respectively connected to one of the eight independent pins It should be independent of the pin.