JPH0140317Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a choke-input type rectifying and smoothing circuit suitable for obtaining a large current output and a small ripple output voltage. This static input type rectifying and smoothing circuit can be used not only for ordinary DC power supply circuits but also for input/output of switching power supplies, etc. in a wide range of applications.

PRIOR TECHNOLOGY A basic input type rectifying and smoothing circuit, for example, as shown in FIG. The rectifier circuit 1 rectifies the rectified output, and the rectified output is connected to one chiyoke coil L1 and one or more capacitors C1.
The smoothing is performed by a smoothing filter circuit 2 which includes a filter circuit 2 having circuits .

If it is desired to reduce the output ripple, a two-stage filter circuit configuration is used, as shown in FIG. 2, in which a choke coil L2 and a capacitor C4 are further added to the output side of the circuit shown in FIG.

Disadvantages of the Prior Art However, with the circuit configuration shown in Figure 1, for example, in a power supply circuit with an output voltage of 5V and an output current of 30A, it is necessary to suppress the output ripple voltage to 10mVpp or less. If you want to reduce the voltage, it is often impossible to obtain the required inductance value due to limitations such as the core size of the chiyoke coil L1, so you have no choice but to increase the number of capacitors C1 to Cn that are connected in parallel. This has disadvantages such as an increase in mounting space and an increase in costs. on the other hand,
In the case of the circuit configuration shown in FIG. 2, it is a two-stage filter, so the number of capacitors may be smaller than in the case of FIG.
Since it is necessary to construct the circuit using a winding wire with a large wire diameter that can flow a large current, a large core is required, resulting in an increase in the mounting space as shown in Figure 1.
This results in disadvantages such as increased costs.

Purpose of the present invention Therefore, the present invention eliminates the above-mentioned conventional drawbacks,
When it is necessary to reduce the output ripple voltage with a large current output, the chiyork impeller is designed to improve electrical performance without substantially increasing the size of the chiyork coil, increasing mounting space, or increasing costs. The purpose of this invention is to provide a rectifying and smoothing circuit.

Structure of the Present Invention In order to achieve the above object, a chiyok input type rectifying and smoothing circuit according to the present invention is a chiyoke input type rectifying and smoothing circuit comprising a plurality of chiyoke coils, wherein the plurality of chiyoke coils are arranged on one end side. are commonly connected on the rectifier circuit side, and at least one of the plurality of coils has a coil different from the plurality of coils connected to its other end, and a smoothing capacitor is connected to the connection point of the coil. The other coils of the plurality of coils are electrically connected in parallel to the series circuit of the coils, and the plurality of coils are connected by a plurality of windings wound around the same core. The plurality of windings are wound in an overlapping manner such that one winding is wound on top of the other winding with the same winding direction, and the plurality of windings are Each of the plurality of chiyoke coils is configured by one or more combinations.

Embodiment FIG. 3 is an electrical circuit connection diagram of a choke input type rectifying and smoothing circuit according to the present invention. In this embodiment, one end of two chiyoke coils L11 and L21 that share the core 3 is commonly connected to the output end of a rectifier circuit 1 configured with diodes D1, D2, etc., and the other end of the chiyoke coil L11 is connected in common. are connected to smoothing capacitors C11 and C12, and the other end of the chiyoke coil L21 is connected to capacitor C2.
1 and C22, respectively. In this embodiment, furthermore, at the other ends of the chiyoke coils L11 and L21, another chiyoke coil L13 and L21 are provided.
Connect one end of 23 to each of the coils L.
The circuit configuration is a two-stage filter in which the other ends of 13 and 23 are connected in common and connected to a smoothing capacitor C5.

With the above-described circuit configuration, the DC output current is divided into the two-stage filter coils L11 and L21, so when a two-stage filter circuit configuration including the two-stage filters L13 and L23 is used, the two-stage filters L13 and L23 are used as the DC output current. It is only necessary to consider the shunt of the current. For this reason, even in the case of large current output, the winding diameters of the two-way coils L13 and L23 can be small, and the inductance value thereof can be kept within a few percent of that of the first-stage two-way coils L11 and L21, resulting in miniaturization. .

More importantly, by skillfully utilizing the general structure of a chiyork coil, which has multiple windings with the same number of turns sharing a core, it is possible to adjust the sharing ratio of DC output current, suppress output ripple voltage, and Effects such as improved physical performance and reduced number of parts can be obtained. Next, this will be explained in detail.

A typical configuration of a chiyoke coil is, for example, a fourth coil.
As shown in the figure, the winding structure is such that a plurality of winding wires 41, 42, . . . 4n having the same number of turns are wound around one core 3. Conventionally, windings 41-
Both ends of the 4n were connected together to form one chiyoke coil as shown in FIGS. 1 and 2. In the present invention, unlike this, as shown in FIG. 5, one end side of the windings 41 to 4n is connected in common, and
By dividing the coil into an appropriate number of pieces on the other end side and connecting the other ends of the two halves in common, two chain coils L11 and L21 that share the core 3 are constructed. Then, the commonly connected one end side is connected to the output end of the rectifier circuit 1, and the two
The separated connection ends A and B are respectively connected to capacitors C21 and C22 and capacitors C11 and C12, respectively. As a result, the circuit shown in FIG. 3 is obtained.

In this case, the windings 41 to 4n for the core 3
As a winding form, as shown in FIG. 6, the winding 41 is wound N times in a line around the core 3, and after insulation treatment is applied, the winding 42 is wound N times in a line on top of the core 3. Furthermore, windings 43, 44,...
4n is sequentially wound N times in a row. This is a method that has been generally used. The inductance L of the windings 41 to 4n wound in this way is expressed by the following general formula: L=μAN ² /l...(1) where μ is the magnetic permeability of the core, A is the cross-sectional area of the winding, and N is the number of turns. l is expressed by the magnetic path length. Here, since μ, N and l are constant, the inductance value L of each winding 41 to 4n
is proportional to the cross-sectional area A of the winding. Each winding 41-4
The cross-sectional area A of n is a function of the winding distance r1 to rn from the center O of the core 3, and the larger the winding distance r1 to rn, that is, the more the winding is wound outward, the larger the cross-sectional area becomes. A becomes larger. For this reason, the winding 41
~4n, the more the winding is wound on the outside, the larger the inductance value L becomes. On the other hand, for the Chi-Yoke coil, the following formula (2) LI = Eπ... (2) where I is the ripple current, E is the voltage applied to the Chi-Yoke coil, and τ is the application time. In equation (2) above, the voltage-time product Eτ
is the same for the windings 41 to 4n, so the inductance value L is inversely proportional to the ripple current I. As explained in the general formula (1), the inductance value L has a larger value in the outer winding among the windings 41 to 4n, so the ripple current I becomes smaller in the outer winding. Therefore, as in the present invention, a plurality of windings 41
By dividing ~4n into inner and outer windings and using the outer winding set as, for example, the chiyoke coil L11, the inductance value L of the chiyoke coil L11 can be reduced.
Since it is possible to increase
11, C12 or the capacitance value can be reduced. In other words, the choke coil L11 constituted by the outer set of windings does not require much consideration for the output ripple voltage, and its main role is to flow a branched portion of the DC output current.
Therefore, as shown in FIG. 7, it is possible to omit the choke coil L13 and capacitors C11 and C12 that constitute the second stage filter, thereby reducing the number of parts and making the circuit smaller.

On the other hand, the inductance value L of the chiyoke coil L21 constituted by the inner set of windings is smaller than that of the chiyoke coil L11, and a ripple current flows in addition to the DC current, so the capacitors C21 and C22 forming the first stage filter are The output ripple voltage is suppressed by connecting the number of filters in parallel within the allowable ripple current and further adding a choke coil L23 to form a two-stage filter circuit configuration. Here, the second-stage chiyoke coil L23 is
Since only the branched portion of the DC output current needs to be taken into consideration, the winding diameter can be small, and the inductance value can be as small as within several percent of the inductance value of the first-stage chiyoke coil L21, resulting in a small chiyoke coil.

In addition, the number of chiyoke coils L11, L21 and capacitors C11, C12, C21, C22,
The configuration of the rectifier circuit 1 is not limited to the embodiment and may be arbitrary. Moreover, it can be used not only as an output circuit but also as a DC input circuit for a switching power supply or the like.

Effects of the Present Invention As described above, the chi-yoke input type rectifying and smoothing circuit according to the present invention is a chi-yoke type rectifying and smoothing circuit comprising a plurality of chi-yoke coils, and one end of the chi-yoke coils is rectified. They are commonly connected on the circuit side, and at least one of the plurality of coils has a different coil connected to the other end, and a smoothing capacitor is connected to the connection point of the coil. The other Chiyork coils of the Chiyork coil are electrically connected in parallel to the Chiyork coil series circuit. The windings are wound in an overlapping manner so that one winding is wound on top of the other winding with the same winding direction, and one or more combinations of the plurality of windings can be used to form a plurality of chain coils. Since the groups closer to the outside are configured with multiple chain coils with larger inductance values, the current share and ripple absorption share are made different for each chain coil, and it is possible to reduce the output ripple voltage with large current output. In some cases, it is possible to provide a chiyoke input type rectifying and smoothing circuit that does not cause a substantial increase in the size of the chiyoke coil, an increase in mounting space, and an increase in cost, and can improve electrical performance.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit connection diagram of a conventional chiyo-input type rectifying and smoothing circuit, Fig. 2 is an electric circuit connection diagram of another conventional example, and Fig. 3 is a diagram of a chiyo-input type rectifying and smoothing circuit according to the present invention. An electric circuit connection diagram of the circuit, FIG. 4 is a diagram showing a general winding state of a Chiyoke coil, and FIG. 5 is a diagram showing a winding connection state of a Chiyoke coil in a Chiyoke impulse type rectifying and smoothing circuit according to the present invention. FIG. 6 is a cross-sectional view showing how the windings are wound around the core, and FIG. 7 is an electrical circuit connection diagram of another embodiment of the choke input type rectifying and smoothing circuit according to the present invention. 1... Rectifier circuit, L11, L21... Chi York coil, C11, C12, C21, C22... Capacitor.

Claims (1)

[Claims for Utility Model Registration] (1) A chiyok input type rectifying and smoothing circuit comprising a plurality of chiyoke coils, wherein one end of the plurality of chiyoke coils is commonly connected to the rectifier circuit side, and At least one of the plurality of Chiyork coils has a Chiyork coil different from the plurality of Chiyork coils connected to the other end thereof, and a smoothing capacitor is connected to the connection point of the Chiyork coil, and the other Chiyork coil of the plurality of Chiyork coils is connected to the other Chiyork coil. The plurality of coils are electrically connected in parallel to a series circuit of the coils, and the plurality of coils are composed of a plurality of windings wound around the same core. The windings are wound in an overlapping manner so that one winding wire is wound on top of the other winding wire in the same direction, and each of the plurality of winding coils is wound by one or more combinations of the plurality of winding wires. A chiyoke input type rectifying and smoothing circuit characterized by the following structure. (2) The chiyoke input type rectifying and smoothing circuit according to claim 1, wherein the plurality of chiyoke coils have different inductance values. (3) The plurality of windings are connected at one end in common,
It is constructed by dividing the other end into multiple sets and connecting each set in common, and when dividing the other end into multiple sets, the multiple sets are combined in sequence according to the order of overlapping winding. A chiyoke impulse type rectifying and smoothing circuit according to claim 1 or 2 of the utility model registration claim, characterized in that: