DC 12V power supply switching power supply circuit

Abstract

The utility model discloses a DC 12V power supply switching power supply circuit, comprising a power supply input end Vin used for inputting DC 3V; the first filter circuit comprises a circuit consisting of a capacitor C1, a capacitor C2 and an inductor L1, and the first filter circuit is used for filtering interference voltage in the power supply input end Vin; the power supply switching circuit comprises an FP6296 chip and a peripheral circuit of the FP6296 chip, and the FP6296 chip is used for switching or converting the Vin voltage of the power supply input end into DC 12V; wherein the power supply input end Vin is electrically connected with a pin 1 and a pin 2 of the FP6296 chip respectively through one end of the capacitor C1, one end of the capacitor C2 and the inductor L1, the other end of the capacitor C1 and the other end of the capacitor C2 are grounded, and a pin 8 of the FP6296 chip outputs DC 12V through the resistor Rout.

Description

Technical Field

[0001] The utility model relates to the technical field of power switching power supply, in particular to a DC12V power switching power supply circuit. Background Art

[0002] Currently, in the design of daily circuits, power switching or conversion circuits are all achieved through complex circuits to switch or convert voltage from low voltage to high voltage. However, the cost of this circuit design is high, and the voltage stability of the circuit output is poor. Therefore, it is necessary to improve this. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides a DC12V power switching power supply circuit.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A DC12V power switching circuit, comprising:

[0006] A power input terminal Vin, wherein the power input terminal Vin is used to input DC3V;

[0007] A first filter circuit, the first filter circuit includes a circuit composed of a capacitor C1, a capacitor C2, and an inductor L1, and the first filter circuit filters the interference voltage in the power input terminal Vin;

[0008] A power switching circuit, the power switching circuit comprising an FP6296 chip and its peripheral circuits, the FP6296 chip being used to switch or convert the voltage of the power input terminal Vin into DC12V;

[0009] Among them, the power input terminal Vin is electrically connected to pin 1 and pin 2 of the FP6296 chip through one end of capacitor C1, one end of capacitor C2, and inductor L1 respectively, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, and pin 8 of the FP6296 chip outputs DC12V through resistor Rout, and the DC12V is used to power subsequent circuits.

[0010] Preferably, the power switching circuit also includes a voltage feedback circuit, which includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to one end of the resistor Rout, the other end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is grounded, and the common end of the resistor R1 and the resistor R2 is electrically connected to pin 5 of the FP6296 chip.

[0011] Preferably, the power switching circuit also includes a second filtering circuit, which is used to filter the interference voltage in the output DC12V; the second filtering circuit includes capacitor C5, capacitor C6, and capacitor C8; one end of the capacitor C5, one end of the capacitor C6, and one end of the capacitor C8 are all electrically connected to one end of the resistor Rout, and the other end of the capacitor C5, the other end of the capacitor C6, and the other end of the capacitor C8 are all grounded.

[0012] Preferably, the power switching circuit also includes an overcurrent adjustment circuit, which includes a resistor R3 and a capacitor C9; one end of the resistor R3 is electrically connected to pin 7 of the FP6296 chip, the other end of the resistor R3 is electrically connected to one end of the capacitor C9 and is grounded, and the other end of the capacitor C9 is electrically connected to one end of the resistor Rout.

[0013] The technical solution of the utility model has the following beneficial effects:

[0014] (1) When the utility model inputs a voltage of DC3V to the power input terminal Vin, it is filtered by capacitors C1, C2, and inductor L to obtain a smooth DC3V voltage, which is then input to pins 1 and 2 of the FP6296 chip. The FP6296 chip then switches or converts the voltage to DC12V through an internal circuit and outputs it through resistor Rout for subsequent circuits;

[0015] (2) When the voltage output by the FP6296 chip changes, the utility model can collect the output voltage through the resistors R1 and R2, and after feeding back the collected voltage to the 5th pin (FB pin) of the FP6296 chip, the FP6296 chip adjusts the output voltage and keeps the voltage output at DC12V. At the same time, the output DC12V voltage is filtered by the second filter circuit to obtain a smoother and more stable voltage. In addition, the output current value can be adjusted by adjusting the resistance value of the resistor R3, thereby ensuring the safety of the subsequent circuit.

[0016] Therefore, the novel circuit design of the present invention is simple, and the input and output voltages are stable, thus ensuring the stable operation of the subsequent circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise expressly specified or limited, a first feature is “on” or “below” a second feature.

[0023] “Under” may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature being “above”, “above”, and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “under”, “below”, and “below” the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] Reference Figure 1 As shown, the utility model is a DC12V power switching power supply circuit, comprising:

[0025] A power input terminal Vin, wherein the power input terminal Vin is used to input DC3V;

[0026] A first filter circuit, the first filter circuit includes a circuit composed of a capacitor C1, a capacitor C2, and an inductor L1, and the first filter circuit filters the interference voltage in the power input terminal Vin;

[0027] A power switching circuit, the power switching circuit comprising an FP6296 chip and its peripheral circuits, the FP6296 chip being used to switch or convert the voltage of the power input terminal Vin into DC12V;

[0028] Among them, the power input terminal Vin is electrically connected to pin 1 and pin 2 of the FP6296 chip through one end of capacitor C1, one end of capacitor C2, and inductor L1 respectively, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, and pin 8 of the FP6296 chip outputs DC12V through resistor Rout, and the DC12V is used to power subsequent circuits.

[0029] Reference Figure 1 : In this embodiment, in order to keep the output voltage stable, the power switching circuit also includes a voltage feedback circuit, which includes a resistor R1 and a resistor R2. One end of the resistor R1 is electrically connected to one end of the resistor Rout, the other end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is grounded, and the common end of the resistor R1 and the resistor R2 is electrically connected to pin 5 of the FP6296 chip.

[0030] Reference Figure 1 : In this embodiment, in order to ensure that there is no interference voltage in the output voltage; the power switching circuit also includes a second filtering circuit, and the second filtering circuit is used to filter the interference voltage in the output DC12V; the second filtering circuit includes capacitor C5, capacitor C6, and capacitor C8; one end of the capacitor C5, one end of the capacitor C6, and one end of the capacitor C8 are all electrically connected to one end of the resistor Rout, and the other end of the capacitor C5, the other end of the capacitor C6, and the other end of the capacitor C8 are all grounded.

[0031] Reference Figure 1: In the present embodiment, in order to ensure that the output circuit current will not be over-current, the power switching circuit also includes an over-current adjustment circuit, and the over-current adjustment circuit includes a resistor R3 and a capacitor C9; one end of the resistor R3 is electrically connected to pin 7 of the FP6296 chip, and the other end of the resistor R3 is electrically connected to one end of the capacitor C9 and grounded, and the other end of the capacitor C9 is electrically connected to one end of the resistor Rout; and then by adjusting the set output current value, it is ensured that after the output voltage, the subsequent voltage and current will not be over-current, thereby ensuring the stability of the subsequent circuit.

[0032] The working principle of this utility model:

[0033] When the power input terminal Vin inputs a voltage of DC3V, it is filtered by capacitors C1, C2, and inductor L to obtain a smooth DC3V voltage, which is then input to pins 1 and 2 of the FP6296 chip. The FP6296 chip then switches or converts the voltage to DC12V through an internal circuit and outputs it through resistor Rout for subsequent circuits.

[0034] When the voltage output by the FP6296 chip changes, the output voltage can be collected through resistors R1 and R2, and the collected voltage is fed back to pin 5 (FB pin) of the FP6296 chip. The FP6296 chip adjusts the output voltage and keeps the voltage output at DC12V. At the same time, the output DC12V voltage is filtered through the second filter circuit to obtain a smoother and more stable voltage. In addition, the output current value can be adjusted by adjusting the resistance value of resistor R3, thereby ensuring the safety of subsequent circuits.

[0035] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A DC12V power switching circuit, characterized in that: include: A power input terminal Vin, wherein the power input terminal Vin is used to input DC3V; A first filter circuit, the first filter circuit includes a circuit composed of a capacitor C1, a capacitor C2, and an inductor L1, and the first filter circuit filters the interference voltage in the power input terminal Vin; A power switching circuit, the power switching circuit comprising an FP6296 chip and its peripheral circuits, the FP6296 chip being used to switch or convert the voltage of the power input terminal Vin into DC12V; Among them, the power input terminal Vin is electrically connected to pin 1 and pin 2 of the FP6296 chip through one end of capacitor C1, one end of capacitor C2, and inductor L1 respectively, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, and pin 8 of the FP6296 chip outputs DC12V through resistor Rout, and the DC12V is used to power subsequent circuits.

2. A DC12V power switching circuit according to claim 1, characterized in that: The power switching circuit also includes a voltage feedback circuit, which includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to one end of the resistor Rout, the other end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is grounded, and the common end of the resistor R1 and the resistor R2 is electrically connected to pin 5 of the FP6296 chip.

3. A DC12V power switching circuit according to claim 1, characterized in that: The power switching circuit also includes a second filtering circuit, which is used to filter the interference voltage in the output DC12V; the second filtering circuit includes capacitor C5, capacitor C6, and capacitor C8; one end of the capacitor C5, one end of the capacitor C6, and one end of the capacitor C8 are all electrically connected to one end of the resistor Rout, and the other end of the capacitor C5, the other end of the capacitor C6, and the other end of the capacitor C8 are all grounded.

4. A DC12V power switching circuit according to claim 1, characterized in that: The power switching circuit also includes an overcurrent adjustment circuit, which includes a resistor R3 and a capacitor C9; one end of the resistor R3 is electrically connected to pin 7 of the FP6296 chip, the other end of the resistor R3 is electrically connected to one end of the capacitor C9 and is grounded, and the other end of the capacitor C9 is electrically connected to one end of the resistor Rout.

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