A circuit that can support 12V and 24V voltage inputs

Abstract

The utility model discloses a circuit can support 12V and 24V voltage input. Including MOS pipe and possessing the switch chip of signal path switching, the gate of MOS pipe is through the sixth resistance ground connection and is through the fifth resistance input power, and the connected end of fifth resistance and input power still is through the seventh electric capacity ground connection, and the drain electrode of MOS pipe is through the ninth resistance input power and is connected with the SEL end foot of switch chip through the tenth resistance, and the D end foot of switch chip is input power, and the S1 end foot of switch chip is through the eleventh resistance output power, and the output end foot of eleventh resistance is respectively through the twelfth resistance, ninth electric capacity, tenth electric capacity ground connection. The utility model discloses can use 12V or 24V direct current power as the input power of equipment, and circuit can automatically identify and switch the route, and finally all are in the same voltage range transmission to the backward stage circuit, and will not because will 12V and 24V power voltage confusion as input voltage and lead to equipment exception or damage.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a circuit that can support 12V and 24V voltage input. Background Technology

[0002] Most commonly used electronic devices only support one type of DC input, such as a single input of 12V or 24V. Using an incompatible DC voltage input can cause the device to malfunction or be damaged. For example, a circuit using a 12V DC input will often burn out the input components due to excessive voltage when using a 24V power input, and in severe cases, damage the core IC, causing irreversible damage to the device. Conversely, a circuit using a 24V DC input will malfunction when using a 12V input, including failing to start or operating outside the normal range, thus affecting the device's efficiency. Therefore, for such electronic devices, it is necessary to select a DC input device that corresponds to the input voltage.

[0003] Therefore, it is necessary to improve the existing input circuit in order to enhance the convenience and safety of the circuit system. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a circuit that can support 12V and 24V voltage input.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circuit capable of supporting 12V and 24V voltage input includes a MOSFET and a switching chip with signal path switching. The gate of the MOSFET is grounded through a sixth resistor and connected to the input power supply through a fifth resistor. The fifth resistor and the input power supply are also grounded through a seventh capacitor. The source of the MOSFET is grounded. The drain of the MOSFET is connected to the input power supply through a ninth resistor and connected to the SEL pin of the switching chip through a tenth resistor. The D pin of the switching chip is connected to the input power supply. The S1 pin of the switching chip outputs power through an eleventh resistor. The output pin of the eleventh resistor is grounded through a twelfth resistor, a ninth capacitor, and a tenth capacitor. The S2 pin of the switching chip directly outputs power and is grounded through an eighth capacitor and an eleventh capacitor.

[0007] Preferably, the D pin of the switch chip is connected to the input power supply through a fuse, and the D pin of the switch chip and the fuse are grounded through a third capacitor, a fourth capacitor, a fifth capacitor, and a twelfth capacitor, respectively.

[0008] Preferably, the VDD pin of the switching chip is connected to a power supply, and the first capacitor and the sixth capacitor are grounded.

[0009] Preferably, the EN pin of the switch chip is connected to the power supply through a fourth resistor and grounded through a third resistor.

[0010] Because of the above solution, this utility model can use 12V or 24V DC power supply as the input power of the device. The circuit can automatically identify and switch the route, and ultimately transmit to the subsequent circuit in the same voltage range. It will not cause abnormality or damage to the device due to confusing 12V and 24V power supply voltages as input voltage. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the circuit principle of an embodiment of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0013] like Figure 1 As shown, this embodiment provides a circuit that supports 12V and 24V voltage inputs, including a MOSFET and a switching chip with signal path switching capabilities. The switching chip can be a TMUX6219. The gate of the MOSFET is grounded through a sixth resistor and connected to the input power supply through a fifth resistor. The fifth resistor, connected to the input power supply, is also grounded through a seventh capacitor. The source of the MOSFET is grounded. The drain of the MOSFET is connected to the input power supply through a ninth resistor and connected to the SEL pin of the switching chip through a tenth resistor. The D pin of the switching chip is connected to the input power supply. The S1 pin of the switching chip outputs power through an eleventh resistor. The output pin of the eleventh resistor is grounded through a twelfth resistor, a ninth capacitor, and a tenth capacitor. The S2 pin of the switching chip directly outputs power and is grounded through an eighth capacitor and an eleventh capacitor. The D pin of the switching chip is connected to the input power supply through a fuse. The D pin of the switching chip and the fuse are grounded through a third capacitor, a fourth capacitor, a fifth capacitor, and a twelfth capacitor. The VDD pin of the switching chip is connected to the power supply and grounded through the first capacitor and the sixth capacitor; the EN pin of the switching chip is connected to the power supply through the fourth resistor and grounded through the third resistor.

[0014] The circuit working principle of this embodiment is as follows:

[0015] This circuit mainly consists of a switching chip U1 as its core, a MOSFET Q1, and external inductors and resistors for the switching chip U1. Pins 2 (S1) and 8 (S2) of the switching chip U1 are controlled by pin 6 (SEL) and pin 1 (D) is turned on. VDD in the circuit represents a 12V or 24V DC input voltage, which will ultimately be input to the subsequent circuit as a 12V voltage.

[0016] When the circuit is operating normally, VDD is input to pin 4 (VDD terminal) of switch chip U1 as the power supply, enabling it to function properly. The operating voltage range of switch chip U1 is 4.5V-36V. Then, through the action of capacitors PC1, PC2, PC3, and PC4, VDD is input to pin 1 (D terminal) of switch chip U1 via fuse L1, lagging behind pin 4. Pin 5 (EN terminal) of switch chip U1 is the switch enable pin. Inputting VDD through resistor R4 allows switch S1 and S2 of switch chip U1 to be turned on and off. Resistor R3 is a pull-down resistor for pin 5 to prevent accidental activation of switch chip U1 due to voltage instability or other influences. Pin 6 (SEL terminal) of switch chip U1 is the switch channel selection pin, receiving a signal from MOSFET Q1 to make a selection.

[0017] The gate (G) of MOSFET Q1 receives VDD through the fifth resistor R5. If VDD is 12V, the gate voltage is 3V under the voltage division of the fifth resistor R5 and the sixth resistor R6. The model of MOSFET Q1 is PMV213SN, and its on-state voltage VGS(th) = 4V. At this time, VGS = 3V, so MOSFET Q1 is turned off. Pin 6 of switch chip U1 is connected to VDD through the ninth resistor R9 and the tenth resistor R10 and is at a high level. Switches S2 and D of switch chip U1 are turned on. Pin 8 outputs a 12V voltage, which is filtered by the eighth capacitor C8 and the eleventh capacitor C11 and transmitted to the subsequent circuit as a stable 12V voltage. If VDD is 24V, after voltage division by resistors R5 and R6, the gate voltage of MOSFET Q1 is 6V. The on-state voltage of MOSFET Q1, VGS(th) = 4V, is less than VGS = 6V at this time, so MOSFET Q1 is turned on. Pin 6 of switch chip U1 is connected to GND through resistor R10 and MOSFET Q1 and is at a low level. Switches S1 and D of switch chip U1 are turned on. At this time, the voltage of pin 2 of switch chip U1 is 24V. After voltage division by resistors R11 and R12, it is 12V. Then, it is filtered by capacitors C9 and C10 and outputs 12V voltage to the subsequent circuit.

[0018] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A circuit capable of supporting 12V and 24V voltage input, characterized in that: The device includes a MOSFET and a switching chip with signal path switching capabilities. The gate of the MOSFET is grounded through a sixth resistor and connected to the input power supply through a fifth resistor. The fifth resistor is also grounded through a seventh capacitor. The source of the MOSFET is grounded. The drain of the MOSFET is connected to the input power supply through a ninth resistor and connected to the SEL pin of the switching chip through a tenth resistor. The D pin of the switching chip is connected to the input power supply. The S1 pin of the switching chip outputs power through an eleventh resistor. The output pin of the eleventh resistor is grounded through a twelfth resistor, a ninth capacitor, and a tenth capacitor. The S2 pin of the switching chip directly outputs power and is grounded through an eighth capacitor and an eleventh capacitor.

2. The circuit as described in claim 1, which can support 12V and 24V voltage input, is characterized in that: The D pin of the switching chip is connected to the input power supply through a fuse, and the D pin of the switching chip and the fuse are grounded through a third capacitor, a fourth capacitor, a fifth capacitor, and a twelfth capacitor, respectively.

3. The circuit as described in claim 2, which can support 12V and 24V voltage input, is characterized in that: The VDD pin of the switching chip is connected to the power supply and grounded through the first capacitor and the sixth capacitor.

4. A circuit as described in claim 3 that can support 12V and 24V voltage input, characterized in that: The EN pin of the switch chip is connected to the power supply through a fourth resistor and grounded through a third resistor.

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