JP2628836B2 - Pulsating current absorption circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulsating current absorbing circuit capable of absorbing a pulsating current of a pulsating load. Conventionally, as a capacitor capable of absorbing a pulsating current of a pulsating load, (1) the capacity of the capacitor must be sufficiently large. (2) It is necessary that the high-frequency impedance of the capacitor is sufficiently low so that the AC component can sufficiently flow. As a capacitor satisfying such conditions, an aluminum electrolytic capacitor has been used. [0003] However, aluminum electrolytic capacitors usually have a so-called dry-up phenomenon in which the internal electrolytic solution evaporates in about 5 to 7 years. Since it is lost, there is a problem in terms of operation such that periodic replacement is required when applied to communication equipment or the like that is used for a long time. Therefore, as a capacitor replacing the aluminum electrolytic capacitor, there are a multilayer ceramic capacitor and a tantalum capacitor. Although neither of the above-mentioned dry-up phenomena occurs, it is difficult to manufacture a multilayer ceramic capacitor having a small size and a large capacity. Further, the tantalum electrolytic capacitor has a drawback that a large amount of the AC component i _AC cannot be flown, so that it has not been possible to simply use it in place of the aluminum electrolytic capacitor. The present invention eliminates these problems, has the same characteristics as an aluminum electrolytic capacitor, and
It is an object of the present invention to provide a pulsating current absorption circuit having a long life. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a non-polar capacitor such as a multilayer ceramic capacitor or a film capacitor connected in parallel to a pulsating load in a pulsating current absorbing circuit. And a series circuit of a choke coil connected in parallel to the non-polar capacitor and a polar capacitor such as a tantalum electrolytic capacitor, and a DC power supply is connected to both ends of the polar capacitor. According to the present invention, since the pulsating current absorption circuit is configured as described above, most of the AC component flowing to the pulsating load flows through the non-polar capacitor, and The pulsating current can be absorbed without passing much AC component. Accordingly, as the non-polar capacitor, a small-capacity, multilayer ceramic capacitor having a high ripple resistance can be used.Also, since the AC component is hardly applied to the polar capacitor, a small-sized and large-capacity capacitor cannot be used. However, polar capacitors such as tantalum electrolytic capacitors with low ripple tolerance can be used. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a pulsating current absorbing circuit diagram showing a first embodiment of the present invention. In FIG.
Reference numeral 10 denotes a DC power supply, 11 denotes a pulsating load constituted by a switching power supply circuit or the like, 12 denotes a polar capacitor having a low ripple resistance, 13 denotes a choke coil, and 14 denotes a non-polar capacitor having a high ripple resistance. Here, most of the AC component flowing to the pulsating load 11 flows to the non-polar capacitor 14 having high ripple resistance, and the AC component does not flow much to the polar capacitor 12 having low ripple resistance. Therefore,
The pulsating current can be absorbed solely by the non-polar capacitor 14 having a high ripple resistance without flowing an AC component to the polar capacitor 12 having a low ripple resistance. FIG. 2 is a pulsating current absorbing circuit diagram showing a second embodiment of the present invention. In this embodiment, similarly to the first embodiment shown in FIG. 1, a DC power supply 10 includes a polar capacitor 12 having a low ripple resistance and a choke coil 1.
3. A non-polar capacitor 14 having high ripple resistance is connected, and a pulsating load 1 is applied to both ends of the non-polar capacitor 14.
1 is connected. The pulsating load 11 includes a transformer 15, a switching element 16, a diode 17, a non-polar capacitor 4 having a high ripple resistance, a choke coil 5, a polar capacitor 6 having a low ripple resistance, and a well-known switching having a load 3. Consists of a regulator. It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made based on the gist of the present invention, and these are not excluded from the scope of the present invention. As described above in detail, according to the present invention, an AC component is mainly passed through a non-polar capacitor such as a multilayer ceramic capacitor or a film capacitor, and is taken out through a choke coil. Since the pulsating current is absorbed by using a polar capacitor such as a tantalum electrolytic capacitor for the direct current, circuit operation failure due to the dry-up phenomenon of the aluminum electrolytic capacitor is eliminated. A usable pulsating current absorption circuit can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a pulsating current absorbing circuit diagram showing a first embodiment of the present invention. FIG. 2 is a pulsating current absorption circuit diagram showing a second embodiment of the present invention. [Description of Signs] 3 Load 4, 14 Non-polar capacitor 5, 13 with high ripple resistance Choke coil 6, 12 Polar capacitor with low ripple resistance 10 DC power supply 11, Pulsation load 15, Transformer 16, Switching element 17, Diode

Claims (1)

(1) A non-polar capacitor connected in parallel to a pulsating load, a series circuit of a choke coil and a polar capacitor connected in parallel to the non-polar capacitor are provided, and both ends of the polar capacitor are provided. A pulsating current absorption circuit, wherein a DC power supply is connected. (2) The pulsating current absorption circuit according to claim 1, wherein the non-polar capacitor is a multilayer ceramic capacitor or a film capacitor. (3) The polarizable capacitor is a tantalum electrolytic capacitor, wherein the polarizer is a tantalum electrolytic capacitor.
The pulsating current absorption circuit according to the item.