Constant-current power supply device for rectifying radiation exceeding standard

Abstract

The utility model provides a constant-current power supply device for rectifying radiation exceeding standards. The constant-current power supply device comprises an input filter unit, a step-down constant-current unit, a step-down chip power supply unit and an output filter circuit, the input end of the input filtering unit is connected with a direct-current power supply, and the output end is connected with the input end of the step-down constant-current unit; the output end of the step-down constant-current unit is connected with the input end of the output filter circuit, and the output end of the output filter circuit outputs direct-current voltage; the step-down constant current unit is provided with a rectification radiation assembly, and the step-down chip power supply unit is connected with the step-down constant current unit through the rectification radiation assembly to provide a working power supply. The rectification radiation assembly is connected in series between the step-down chip power supply unit and the step-down constant current unit, so that the rapid change of energy can be hindered, the working state is slowed down, namely, the ratio of voltage to current is reduced, the radiation capability is weakened, the effect of suppressing radiation is achieved, and meanwhile, the cost is relatively low.

Description

Technical Field

[0001] The utility model belongs to the technical field of constant current power supply, and specifically relates to a constant current power supply device for rectifying excessive radiation. Background Art

[0002] In order to rectify the excessive radiation of traditional step-down constant current circuits, it is necessary to add input magnetic rings to rectify the radiation. The addition of magnetic rings will increase the manufacturing cost; or the inductance of the step-down inductor can be changed to change the frequency to rectify the radiation, which will increase the size of the inductor and increase the cost. Utility Model Content

[0003] In order to overcome the above technical defects, the utility model provides a constant current power supply device for rectifying excessive radiation, which can reduce the cost of radiation rectification.

[0004] The utility model is realized by the following scheme:

[0005] A constant current power supply device for rectifying excessive radiation, comprising: an input filter unit, a step-down constant current unit, a step-down chip power supply unit, and an output filter circuit;

[0006] The input end of the input filter unit is connected to a DC power supply, and the output end is connected to the input end of the step-down constant current unit;

[0007] The output end of the step-down constant current unit is connected to the input end of the output filter circuit, and the output end of the output filter circuit outputs a DC voltage;

[0008] The step-down constant current unit is provided with a rectification radiation component, and the step-down chip power supply unit is connected to the step-down constant current unit through the rectification radiation component to provide a working power supply;

[0009] The step-down constant current unit is provided with a step-down chip, and the rectification radiation component comprises: a first magnetic bead, a second magnetic bead, and a third magnetic bead;

[0010] The step-down chip is provided with the first magnetic bead and the second magnetic bead in series.

[0011] As a further improvement of the present invention, the first magnetic beads and the second magnetic beads are stacked magnetic beads.

[0012] As a further improvement of the utility model, the step-down chip power supply unit is provided with a power supply chip, and the constant current power supply device further includes: a third magnetic bead;

[0013] The power supply chip, the third magnetic bead, and the step-down constant current unit are connected in sequence.

[0014] As a further improvement of the present invention, the third magnetic beads are laminated magnetic beads.

[0015] As a further improvement of the utility model, the utility model also includes: a chip capacitor and a chip resistor;

[0016] The step-down chip power supply unit is connected to the step-down constant current unit through the chip capacitor and the chip resistor.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: by connecting the radiation rectification component in series between the step-down chip power supply unit and the step-down constant current unit, the rapid change of energy can be hindered and the working state can be slowed down, that is, the ratio of voltage to current is reduced, thereby weakening the radiation capacity and achieving the effect of suppressing radiation, while the cost is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 It is a schematic diagram of the overall structure of the constant current power supply device of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the input filter unit, the step-down constant current unit, and the output filter circuit of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the step-down chip power supply unit of the utility model.

[0022] Figure numerals: 1. Input filter unit; 2. Buck constant current unit; 3. Buck chip power supply unit; 4. Output filter circuit. DETAILED DESCRIPTION

[0023] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0024] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0025] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0026] The utility model provides a constant current power supply device for rectifying excessive radiation, such as Figure 1 As shown, it includes: an input filter unit 1, a buck constant current unit 2, a buck chip power supply unit 3, and an output filter circuit 4; the input end of the input filter unit 1 is connected to a DC power supply, and the output end is connected to the input end of the buck constant current unit 2; the output end of the buck constant current unit 2 is connected to the input end of the output filter circuit 4, and the output end of the output filter circuit 4 outputs a DC voltage; the buck constant current unit 2 is provided with a rectification radiation component, and the buck chip power supply unit 3 is connected to the buck constant current unit 2 through the rectification radiation component to provide a working power supply.

[0027] like Figure 2 As shown, the buck constant current unit 2 is provided with a buck chip U1, and the radiation rectification component includes: a first magnetic bead B1, a second magnetic bead B2, and a third magnetic bead B3; the buck chip U1 is provided with the first magnetic bead B1 and the second magnetic bead B2 in series.

[0028] The step-down chip U1 can be implemented using a chip of the OC5228B or Hi7011 type.

[0029] Specifically, the first magnetic bead B1 and the second magnetic bead B2 are both laminated magnetic beads, which have a better radiation suppression effect. The first magnetic bead B1 and the second magnetic bead B2 are both connected in series in the branch of the DRAIN pin in the buck chip U1.

[0030] like Figure 3 As shown, the step-down chip power supply unit 3 is provided with a power supply chip U3, and the constant current power supply device further includes: a third magnetic bead B3; the power supply chip U3, the third magnetic bead B3, and the step-down constant current unit 2 are connected in sequence. The third magnetic bead B3 is connected in series in the branch of the SWITCH pin in the power supply chip U3.

[0031] Preferably, the third magnetic bead B3 is a laminated magnetic bead, which has a better radiation suppression effect.

[0032] As a further improvement of the utility model, the utility model also includes: a chip capacitor C14 and a chip resistor R3; the step-down chip power supply unit 3 is connected to the step-down constant current unit 2 via the chip capacitor C14 and the chip resistor R3.

[0033] It should be noted that other structures of the input filter unit 1, the buck constant current unit 2, the buck chip power supply unit 3, and the output filter circuit 4 can be referred to in the prior art and will not be described in detail here.

[0034] Taking the step-down chip of model OC5228B and the power supply chip of model OC5864 as examples, the specific implementation process of the utility model is further explained as follows:

[0035] The voltage output by the buck chip power supply unit 3 is connected to the DRAIN pin of the buck chip U1 through the first magnetic bead B1, the resistor R5, the capacitor C7, and the second magnetic bead B2. At the same time, the voltage output by the buck chip power supply unit 3 is connected to the DRAIN pin of the buck chip U1 through the polar capacitor EC3, the inductor L1, and the second magnetic bead B2. The SWITCH pin of the power supply chip U3 is connected to the buck constant current unit 2 through the third magnetic bead B3, the inductor L2, and the chip capacitor C14.

[0036] The setting of multiple stacked magnetic beads hinders the rapid change of energy, which is similar to lowering the frequency and slowing down the working state, that is, reducing the ratio of voltage to current, thereby weakening the radiation capacity and achieving the effect of suppressing radiation, which can greatly reduce costs.

[0037] After adopting the above two measures, if the radiation margin needs to be increased, the buck constant current unit 2 can be connected to the FB pin of the power supply chip U3 through the capacitor C8 and the chip capacitor C14 to further reduce the conduction and radiation, thereby further reducing the radiation. The effect of suppressing radiation can be achieved without adding too much extra cost.

[0038] For other peripheral circuits of the step-down chip U1 and the power supply chip U3, please refer to the prior art and will not be described in detail here.

[0039] Compared with the traditional radiation rectification scheme, the margin of the utility model is greatly improved, with a margin of more than 3DB. At the same time, the circuit structure cost of the utility model is lower than the scheme of increasing and changing the inductor size.

[0040] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A constant current power supply device for rectifying excessive radiation, characterized in that: include: Input filter unit, buck constant current unit, buck chip power supply unit, output filter circuit; The input end of the input filter unit is connected to a DC power supply, and the output end is connected to the input end of the step-down constant current unit; The output end of the step-down constant current unit is connected to the input end of the output filter circuit, and the output end of the output filter circuit outputs a DC voltage; The step-down constant current unit is provided with a rectification radiation component, and the step-down chip power supply unit is connected to the step-down constant current unit through the rectification radiation component to provide a working power supply; The step-down constant current unit is provided with a step-down chip, and the rectification radiation component comprises: a first magnetic bead and a second magnetic bead; The step-down chip is provided with the first magnetic bead and the second magnetic bead in series.

2. The constant current power supply device according to claim 1, characterized in that: The first magnetic beads and the second magnetic beads are stacked magnetic beads.

3. The constant current power supply device according to claim 1, characterized in that: The step-down chip power supply unit is provided with a power supply chip, and the constant current power supply device further comprises: a third magnetic bead; The power supply chip, the third magnetic bead, and the step-down constant current unit are connected in sequence.

4. The constant current power supply device according to claim 3, characterized in that: The third magnetic beads are stacked magnetic beads.

5. The constant current power supply device according to claim 1, characterized in that: Also includes: Chip capacitors, chip resistors; The step-down chip power supply unit is connected to the step-down constant current unit through the chip capacitor and the chip resistor.

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