CN217362906U - Voltage conversion circuit - Google Patents
Voltage conversion circuit Download PDFInfo
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- CN217362906U CN217362906U CN202122980401.6U CN202122980401U CN217362906U CN 217362906 U CN217362906 U CN 217362906U CN 202122980401 U CN202122980401 U CN 202122980401U CN 217362906 U CN217362906 U CN 217362906U
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Abstract
The present disclosure relates to a voltage conversion circuit, including: an input interface for connecting a battery voltage; a USB interface; the voltage input end of the direct current step-down voltage stabilizer chip is electrically connected with the input interface, the voltage output end of the direct current step-down voltage stabilizer chip is electrically connected with the USB interface, and the direct current step-down voltage stabilizer chip is used for converting the battery voltage into 5V voltage to be output from the USB interface. This is disclosed through adopting direct current step-down stabiliser chip, can make the consumption of circuit reduce to several microamperes, can reduce the consumption speed of lithium cell electric quantity, extension lithium cell life reduces the potential safety hazard, and the whole with low costs of circuit, the practicality is good.
Description
Technical Field
The disclosure relates to the technical field of voltage conversion circuits, in particular to a voltage conversion circuit.
Background
In recent years, with the deep popularization of energy-saving and emission-reduction concepts, batteries have been widely applied to various vehicles as power sources to reduce the usage amount of gasoline and reduce carbon emission. The vehicle-mounted USB interface is a device widely configured for the current automobile, needs to be matched with a voltage conversion circuit for use, and the voltage conversion circuit converts the output voltage of the automobile lithium battery into 5V voltage and outputs the 5V voltage to the USB interface, so that the USB interface can output the 5V voltage outwards.
Because the USB interface needs to be inserted along with the usefulness, so voltage conversion circuit needs to keep work continuously, and traditional voltage conversion circuit consumption is great, generally is greater than 200 microamperes, reaches several milliamperes even, and this can show the consumption speed that increases lithium cell electric quantity, harm the life-span of lithium cell, has certain potential safety hazard even. In the prior art, a part of voltage conversion circuits are connected to the MCU to control the on-off of the circuits, so that although the power consumption of the circuits can be reduced, the circuit cost is high, and the practicability is poor.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of the prior art, the present disclosure is directed to a voltage converting circuit. This is openly through adopting direct current step-down stabiliser chip, can make the consumption of circuit reduce to several microamperes, can reduce the consumption speed of lithium cell electric quantity, extension lithium cell life, reduces the potential safety hazard, and the circuit is whole with low costs, the practicality is good.
The voltage conversion circuit of this disclosure includes:
an input interface for connecting a battery voltage;
a USB interface;
the voltage input end of the direct current step-down voltage stabilizer chip is electrically connected with the input interface, the voltage output end of the direct current step-down voltage stabilizer chip is electrically connected with the USB interface, and the direct current step-down voltage stabilizer chip is used for converting battery voltage into 5V voltage to be output from the USB interface.
Preferably, the direct current step-down voltage regulator chip is an LMR14010A chip.
Preferably, the voltage conversion circuit further includes:
the capacitance value of the first capacitor C1 is 4.7 uF;
a second capacitor, wherein the capacitance value of the second capacitor C2 is 100 nF;
the VIN pin of the LMR14010A chip is used for connecting battery voltage, the VIN pin is in short circuit with the SHDN pin, one end of the first capacitor is connected with the VIN pin of the LMR14010A chip after the first capacitor is connected with the second capacitor in parallel, and the other end of the first capacitor is grounded with the GND pin of the LMR14010A chip in a common point mode.
Preferably, the voltage conversion circuit further includes:
a current fuse connected to the VIN pin front end of the LMR14010A chip.
Preferably, the voltage conversion circuit further includes:
one end of the inductor is connected with the SW pin of the LMR14010A chip, and the other end of the inductor is connected with the positive output end of the USB interface;
the CB pin and the SW pin of the LMR14010A chip are connected through the third capacitor;
a fourth capacitor;
a fifth capacitor, one end of which is connected between the inductor and the positive output terminal after the fourth capacitor is connected with the fifth capacitor in parallel, and the other end of which is connected to ground, and is also connected between the SW pin of the LMR14010A chip and the inductor;
the FB pin of the LMR14010A chip is connected with the positive output end through the first resistor;
the FB pin of the LMR14010A chip is grounded through the second resistor and is also connected with the negative output end of the USB interface;
and the positive output end and the negative output end are connected through the sixth capacitor.
Preferably, the voltage conversion circuit further includes:
a first diode connected to a front end of the positive output terminal, and a current of the first diode flows toward the positive output terminal.
Preferably, the voltage conversion circuit further includes:
and the fourth capacitor is connected with the fifth capacitor in parallel and then is connected between the SW pin of the LMR14010A chip and the inductor through the second diode, and the current of the second diode flows to the SW pin of the LMR14010A chip.
Preferably, the inductor is a SWPA6045 type inductor.
The voltage conversion circuit has the advantages that the integrated direct current step-down voltage stabilizer is used as a voltage conversion element, so that the power consumption of the circuit can be reduced to several microamperes, the power consumption speed of a lithium battery can be obviously reduced, the service life of the lithium battery can be prolonged, and potential safety hazards can be reduced; the circuit is simple in structure, convenient to arrange and apply, low in overall cost and good in practicability.
Drawings
Fig. 1 is a schematic circuit diagram of a voltage conversion circuit according to the present disclosure.
Description of reference numerals: u1-direct current step-down voltage regulator chip, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, F1-current fuse, L1-inductor, R1-first resistor, R2-second resistor, D1-first diode, and D2-second diode.
Detailed Description
As shown in fig. 1, a voltage conversion circuit according to the present disclosure includes:
the input interface is used for connecting the voltage of the battery;
the USB interface is usually arranged at a position of a vehicle main console and used for externally connecting mobile equipment such as a mobile phone and the like to charge the mobile equipment.
DC step-down voltage regulator chip U1, DC step-down voltage regulator chip U1's voltage input end is connected with the input interface electricity, voltage output end is connected with the USB interface electricity, battery voltage inputs the voltage input end of DC step-down voltage regulator chip U1 from the input interface, carry out the steady voltage that steps down in DC step-down voltage regulator chip U1, then export 5V voltage to the USB kneck, make the USB interface circular telegram can charge for external equipment.
According to the lithium battery voltage reduction circuit, the integrated direct current voltage reduction voltage stabilizer is used as a voltage conversion element, so that the power consumption of the circuit can be reduced to several microamperes, the power consumption speed of a lithium battery can be obviously reduced, the service life of the lithium battery is prolonged, and potential safety hazards are reduced; the circuit is simple in structure, convenient to arrange and apply, low in overall cost and good in practicability.
Furthermore, in this embodiment, the dc step-down regulator chip U1 is specifically an LMR14010A chip, and the LMR14010A chip has a wide input range of 4V to 40V, and the operating frequency is fixed at 0.7MHz, thereby allowing the use of small external components and the mounting of a small load, and therefore, the dc step-down regulator chip can be applied to a conversion circuit between an automotive lithium battery and a USB interface, and can convert the output voltage of the automotive lithium battery into a 5V voltage required by the USB interface. The turn-off current of the chip is 1 microampere, so that the chip has the advantage of low power consumption due to the characteristic of ultralow turn-off current, the power consumption of the circuit can be reduced to several microampere levels, the power consumption speed of the lithium battery can be remarkably reduced, and the problems that the battery is damaged and potential safety hazards exist due to the power shortage of a battery conversion circuit are solved. Meanwhile, the cost of the LMR14010A chip is lower than that of the MCU chip, and a complex peripheral circuit is not required to be built, so that the overall cost of the voltage conversion circuit is low, and the practicability is better.
Further, in this embodiment, the voltage conversion circuit further includes:
the capacitance value of the first capacitor C1 and the capacitance value of the first capacitor C1 are 4.7 uF;
a second capacitor C2, the capacitance value of the second capacitor C2 being 100 nF;
the VIN pin of the LMR14010A chip is used for connecting battery voltage, the VIN pin is in short circuit with the SHDN pin, one end of the first capacitor C1 is connected with the VIN pin of the LMR14010A chip after being connected with the second capacitor C2 in parallel, the other end of the first capacitor C1 is in common point grounding with the GND pin of the LMR14010A chip, the structure forms a voltage input end structure of the LMR14010A chip, and the input voltage can be effectively filtered through the first capacitor C1 and the second capacitor C2, so that the input voltage keeps high direct current, and the ripple coefficient of the output voltage of the LMR140 14010A chip is reduced.
Further, in this embodiment, the voltage conversion circuit further includes:
the current fuse F1, the current fuse F1 inserts in the VIN foot front end at LMR14010A chip, and current fuse F1 is used for carrying out overcurrent protection, cuts off the input circuit when the input current overflows, prevents that the LMR14010A chip is damaged in the excessive current.
Further, in this embodiment, the voltage conversion circuit further includes:
one end of an inductor L1 and one end of an inductor L1 are connected with the SW pin of the LMR14010A chip, the other end of the inductor L1 are connected with the positive output end of the USB interface,
a CB pin and a SW pin of the LMR14010A chip are connected through a third capacitor C3 through a third capacitor C3, and the capacitance value of the third capacitor C3 is 100 nF;
a fourth capacitance C4; the capacitance value of the fourth capacitor C4 is 33 uF;
after being connected in parallel, one end of a fifth capacitor C5, a fourth capacitor C4 and the fifth capacitor C5 is connected between an inductor L1 and the positive output end, the other end of the fifth capacitor C4 is grounded, and the fourth capacitor C4 and the fifth capacitor C5 are also connected between the SW pin of the LMR14010A chip and the inductor L1; the capacitance value of the fifth capacitor C5 is 100 nF;
the first resistor R1 and the FB pin of the LMR14010A chip are connected with the positive output end through the first resistor R1, and the resistance value of the first resistor R1 is 110K omega;
the second resistor R2 and the FB pin of the LMR14010A chip are grounded through the second resistor R2 and are also connected with the negative output end of the USB interface, and the resistance value of the second resistor R2 is 20K omega;
and a sixth capacitor C6, wherein the positive output terminal and the negative output terminal are connected through the sixth capacitor C6, and the capacitance value of the sixth capacitor C6 is 100 nF.
The circuit structure forms a voltage output end structure of the LMR14010A chip, the positive output end and the negative output end jointly form 5V voltage output, and the output voltage can be subjected to decoupling filtering through components such as an inductor, a capacitor and a resistor, so that the direct current stability of the output voltage is maintained.
Further, in this embodiment, the voltage conversion circuit further includes:
the first diode D1, the first diode D1 is connected to the front end of the positive output end, and the current of the first diode D1 flows towards the positive output end, the first diode D1 is used for ensuring the one-way mobility of the current, ensuring the current to stably flow to the positive output end, and preventing the current from flowing backwards.
Further, in this embodiment, the voltage conversion circuit further includes:
the second diode D2, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel and then connected between the SW pin of the LMR14010A chip and the inductor L1 through the second diode D2, the current of the second diode D2 flows towards the SW pin of the LMR14010A chip, and the second diode D2 is used for ensuring the one-way flowing of the current, so that the fourth capacitor C4 and the fifth capacitor C5 can play a stable decoupling filtering role.
Furthermore, in this embodiment, inductor L1 selects SWPA6045 type inductor, and this type inductor has that the inductance value is suitable, leads to the effectual advantage of direct current resistance interchange.
In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the present disclosure, and in the absence of a contrary explanation, these directional terms are not intended to indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present disclosure.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present disclosure.
Claims (5)
1. A voltage conversion circuit, comprising:
an input interface for connecting a battery voltage;
a USB interface;
the voltage input end of the direct current step-down voltage stabilizer chip is electrically connected with the input interface, the voltage output end of the direct current step-down voltage stabilizer chip is electrically connected with the USB interface, and the direct current step-down voltage stabilizer chip is used for converting the battery voltage into 5V voltage and outputting the 5V voltage from the USB interface; the direct current voltage reduction regulator chip is an LMR14010A chip;
the capacitance value of the first capacitor C1 is 4.7 uF;
a second capacitor, the capacitance value of the second capacitor C2 being 100 nF;
the VIN pin of the LMR14010A chip is used for connecting battery voltage, the VIN pin is in short circuit with the SHDN pin, one end of the first capacitor is connected with the VIN pin of the LMR14010A chip after the first capacitor is connected with the second capacitor in parallel, and the other end of the first capacitor is connected with the GND pin of the LMR14010A chip in a point-sharing mode;
a current fuse connected to the VIN pin front end of the LMR14010A chip.
2. The voltage conversion circuit of claim 1, further comprising:
one end of the inductor is connected with the SW pin of the LMR14010A chip, and the other end of the inductor is connected with the positive output end of the USB interface;
the CB pin and the SW pin of the LMR14010A chip are connected through a third capacitor;
a fourth capacitor;
after the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor is connected between the inductor and the positive output end, the other end of the fourth capacitor is grounded, and the fourth capacitor is also connected between the SW pin of the LMR14010A chip and the inductor;
the FB pin of the LMR14010A chip is connected with the positive output end through the first resistor;
the FB pin of the LMR14010A chip is grounded through the second resistor and is also connected with the negative output end of the USB interface;
and the positive output end and the negative output end are connected through the sixth capacitor.
3. The voltage conversion circuit of claim 2, further comprising:
a first diode connected to a front end of the positive output terminal, and a current of the first diode flows toward the positive output terminal.
4. The voltage conversion circuit of claim 3, further comprising:
and the fourth capacitor is connected with the fifth capacitor in parallel and then is connected between the SW pin of the LMR14010A chip and the inductor through the second diode, and the current of the second diode flows towards the SW pin of the LMR14010A chip.
5. The voltage conversion circuit of claim 4, wherein the inductor is a SWPA6045 type inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122980401.6U CN217362906U (en) | 2021-11-30 | 2021-11-30 | Voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122980401.6U CN217362906U (en) | 2021-11-30 | 2021-11-30 | Voltage conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217362906U true CN217362906U (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122980401.6U Active CN217362906U (en) | 2021-11-30 | 2021-11-30 | Voltage conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217362906U (en) |
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2021
- 2021-11-30 CN CN202122980401.6U patent/CN217362906U/en active Active
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