CN210626559U - In-chip integrated battery voltage direct sampling circuit - Google Patents
In-chip integrated battery voltage direct sampling circuit Download PDFInfo
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- CN210626559U CN210626559U CN201921302563.0U CN201921302563U CN210626559U CN 210626559 U CN210626559 U CN 210626559U CN 201921302563 U CN201921302563 U CN 201921302563U CN 210626559 U CN210626559 U CN 210626559U
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Abstract
The embodiment of the utility model provides an in-chip integrated battery voltage directly adopts circuit, in-chip integrated battery voltage directly adopts the circuit to include: the circuit comprises a battery power domain access terminal, a first voltage-dividing resistor, a second voltage-dividing resistor and an analog-to-digital converter (ADC), wherein the first voltage-dividing resistor, the second voltage-dividing resistor and the ADC are integrated in a chip; one end of the battery power domain access terminal is connected with a battery power supply, the other end of the battery power domain access terminal is connected with one end of a first divider resistor, the other end of the first divider resistor and one end of a second divider resistor are connected with a first node, the first node is connected to the input end of the ADC, and the other end of the second divider resistor is grounded.
Description
Technical Field
The utility model relates to a circuit design technical field especially relates to an in-chip integrated battery voltage directly adopts circuit.
Background
In a system powered by a battery, particularly a lithium battery, in order to ensure normal and reliable operation of the system, a battery management system must monitor the voltage of the battery in the system in real time. The collected battery voltage is typically quantized using an analog-to-digital converter (ADC).
However, the full scale of the ADC is usually only 1V or 1.2V, and the battery voltage can reach 4.2V or even higher, so in practical application, a voltage dividing circuit needs to be added outside the chip to divide the voltage from 4.2V to about 1V, and then the voltage is input to the ADC. According to the scheme, a user needs to additionally build an external voltage division circuit when the chip is used, and in addition, because different users need to build the circuit by themselves, the method is not uniform, and the accuracy of battery voltage acquisition is not easy to guarantee for different users.
SUMMERY OF THE UTILITY MODEL
The utility model aims at prior art's defect, provide an in-chip integrated battery voltage directly adopts circuit, integrate divider resistance to the chip inside for the user can be directly insert the chip to battery power, need not additionally increase bleeder circuit again. The voltage acquisition device is convenient for users to use, and has better guarantee on the accuracy of voltage acquisition.
In order to achieve the above object, the utility model provides an in-chip integrated battery voltage direct sampling circuit, include: the on-chip integrated battery voltage direct sampling circuit comprises: the circuit comprises a battery power domain access terminal, a first voltage-dividing resistor, a second voltage-dividing resistor and an analog-to-digital converter (ADC), wherein the first voltage-dividing resistor, the second voltage-dividing resistor and the ADC are integrated in a chip;
one end of the battery power domain access terminal is connected with a battery power supply, the other end of the battery power domain access terminal is connected with one end of a first divider resistor, the other end of the first divider resistor and one end of a second divider resistor are connected with a first node, the first node is connected to the input end of the ADC, and the other end of the second divider resistor is grounded.
Preferably, the resistance ratio of the first voltage-dividing resistor to the second voltage-dividing resistor is a preset constant ratio.
Further preferably, the battery power supply is a 4.2V lithium battery power supply, and the preset constant ratio is 3: 1.
the embodiment of the utility model provides a circuit is directly adopted to integrated battery voltage in piece, inside divider resistance integrated chip for the user can be directly insert the chip to battery power, need not additionally increase bleeder circuit again. The voltage acquisition device is convenient for users to use, and has better guarantee on the accuracy of voltage acquisition.
Drawings
Fig. 1 is a schematic diagram of an on-chip integrated battery voltage direct current sampling circuit according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
The embodiment of the utility model provides a circuit is directly adopted to integrated battery voltage in piece can be used for all kinds of treater chips, especially safety chip. Fig. 1 is a schematic diagram of an on-chip integrated battery voltage direct sampling circuit provided by an embodiment of the present invention, and the following description is made with reference to fig. 1 to explain the on-chip integrated battery voltage direct sampling circuit provided by an embodiment of the present invention.
In this example, the battery power domain of the chip is connected to a lithium battery power source, and in a specific example, the typical voltage VBAT of the battery power domain is 4.2V.
The on-chip integrated battery voltage direct sampling circuit provided by the embodiment comprises: the power supply domain access circuit comprises a battery power domain access terminal VBAT, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2 and an analog-digital converter ADC, wherein the first voltage-dividing resistor R1, the second voltage-dividing resistor R2 and the analog-digital converter ADC are integrated in a chip;
one end of the battery power domain access terminal VBAT is connected with a lithium battery power supply, the other end of the battery power domain access terminal VBAT is connected with one end of the first voltage-dividing resistor R1, the other end of the first voltage-dividing resistor R1 and one end of the second voltage-dividing resistor R2 are connected with the first node T, the first node T is connected to the input end of the analog-to-digital converter ADC, and the other end of the second voltage-dividing resistor R is grounded.
Wherein, the resistance ratio of the first divider resistor R1 and the second divider resistor R2 is a preset constant ratio.
In one specific example, the battery power supply is a 4.2V lithium battery power supply, and the preset constant ratio is 3: 1. since the full scale of the ADC is usually only 1V or 1.2V, in this scheme, 3: 1, the voltage is divided from 4.2V to about 1V and then sent to the ADC. The quantized voltage value output from the first node T to the ADC is R2/(R1+ R2) × 4.2V.
In the practical application of the battery voltage direct-sampling circuit provided by the embodiment, only the proportion of two divider resistors is required to be accurate, the absolute value of each resistor is not required to reach high precision, the proportion of the divider resistors is accurate and can be realized through design and a semiconductor preparation process, the process steps of the divider resistors can be completely fused in the chip preparation process, additional process steps cannot be added, and therefore the integration into a chip is feasible.
The chip of the on-chip integrated battery voltage direct-sampling circuit has good consistency, and ensures the voltage acquisition precision of different users in the practical voltage acquisition application.
The above-exemplified 4.2V, 3: the voltage dividing resistance ratio of 1 is only an example in a specific application scenario, and in different application scenarios, a chip with a voltage dividing resistance configured correspondingly can be selected according to needs, which can be achieved by those skilled in the art.
The embodiment of the utility model provides a circuit is directly adopted to integrated battery voltage in piece, inside divider resistance integrated chip for the user can be directly insert the chip to battery power, need not additionally increase bleeder circuit again. The voltage acquisition device is convenient for users to use, and has better guarantee on the accuracy of voltage acquisition.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. The utility model provides an on-chip integrated battery voltage directly adopts circuit which characterized in that, on-chip integrated battery voltage directly adopts the circuit and includes: the circuit comprises a battery power domain access terminal, a first voltage-dividing resistor, a second voltage-dividing resistor and an analog-to-digital converter (ADC), wherein the first voltage-dividing resistor, the second voltage-dividing resistor and the ADC are integrated in a chip;
one end of the battery power domain access terminal is connected with a battery power supply, the other end of the battery power domain access terminal is connected with one end of a first divider resistor, the other end of the first divider resistor and one end of a second divider resistor are connected with a first node, the first node is connected to the input end of the ADC, and the other end of the second divider resistor is grounded.
2. The on-chip integrated battery voltage direct current sampling circuit according to claim 1, wherein a resistance ratio of the first voltage dividing resistor and the second voltage dividing resistor is a preset constant ratio.
3. The on-chip integrated battery voltage direct current sampling circuit according to claim 2, wherein the battery power supply is a 4.2V lithium battery power supply, and the preset constant ratio is 3: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921302563.0U CN210626559U (en) | 2019-08-12 | 2019-08-12 | In-chip integrated battery voltage direct sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921302563.0U CN210626559U (en) | 2019-08-12 | 2019-08-12 | In-chip integrated battery voltage direct sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210626559U true CN210626559U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921302563.0U Active CN210626559U (en) | 2019-08-12 | 2019-08-12 | In-chip integrated battery voltage direct sampling circuit |
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| CN (1) | CN210626559U (en) |
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2019
- 2019-08-12 CN CN201921302563.0U patent/CN210626559U/en active Active
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Address after: 100080, Beijing, Suzhou Street, Haidian District No. 20, building 2, on the north side of the four floor Patentee after: Zhaoxun Hengda Technology Co., Ltd Address before: 100080, Beijing, Suzhou Street, Haidian District No. 20, building 2, on the north side of the four floor Patentee before: MEGAHUNT MICROELECTRONIC TECH. (BEIJING) Co.,Ltd. |