CN117908616A - Voltage dividing circuit with driving capability - Google Patents
Voltage dividing circuit with driving capability Download PDFInfo
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- CN117908616A CN117908616A CN202410299630.7A CN202410299630A CN117908616A CN 117908616 A CN117908616 A CN 117908616A CN 202410299630 A CN202410299630 A CN 202410299630A CN 117908616 A CN117908616 A CN 117908616A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
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Abstract
The application discloses a voltage dividing circuit with driving capability, which comprises: the first current mirror circuit is provided with a first end, a second end, a third end and a fourth end, and the fourth end of the first current mirror circuit is used as an output end of the voltage dividing circuit; the operational amplifier is provided with a first input end, a second input end and an output end, wherein the first input end of the operational amplifier is connected with the first end of the first current mirror circuit, and the output end of the operational amplifier is connected with the third end of the first current mirror circuit; the second current mirror circuit is provided with a first end, a second end and a third end, the second end of the second current mirror circuit is connected with the second end of the first current mirror circuit, and the current values of the first end of the first current mirror circuit and the first end of the second current mirror circuit are equal and are the first current; the second end of the first current mirror circuit has the same current value as the second end of the second current mirror circuit, and is a second current, the first current and the second current have a proportional relation, and the current value of the fourth end of the first current mirror is the sum of the first current and the second current.
Description
Technical Field
The application relates to the technical field of integrated circuits, in particular to a voltage dividing circuit with driving capability.
Background
The battery module is formed by connecting multiple batteries in series, each battery in the battery module needs to be measured and monitored in real time respectively, and when the battery monitoring technology is that the battery is monitored, diagnosed and early-warned through technical means such as a sensor or an intelligent chip at the end of the service life of the battery or when the electric quantity of the battery is insufficient, the battery module is used for helping a user to take corresponding measures in time, and the operation of the whole battery module is prevented from being influenced by the abnormality of the state of the single-stage battery.
Disclosure of Invention
In view of the above, an object of the present application is to provide a voltage dividing circuit having a post-stage driving capability.
According to an aspect of the present invention, there is provided a voltage dividing circuit having driving capability, including: a first current mirror circuit having a first end, a second end, a third end, and a fourth end, the fourth end of the first current mirror circuit being used as an output end of the voltage divider circuit; the operational amplifier is provided with a first input end, a second input end and an output end, wherein the first input end of the operational amplifier is connected to the first end of the first current mirror circuit, and the output end of the operational amplifier is connected to the third end of the first current mirror circuit; the second current mirror circuit is provided with a first end, a second end and a third end, the second end of the second current mirror circuit is connected with the second end of the first current mirror circuit, wherein the value of the current flowing through the first end of the first current mirror circuit is equal to the value of the current flowing through the first end of the second current mirror circuit, and the value of the current flowing through the first end of the second current mirror circuit is defined as a first current; the second end of the first current mirror circuit and the second end of the second current mirror circuit have the same current value, and are defined as second current, the first current and the second current have a proportional relation, and the current value of the fourth end of the first current mirror is the sum of the first current and the second current.
Drawings
The above and other objects, features and advantages of the present application will become more apparent from the following description of embodiments of the present application with reference to the accompanying drawings in which:
Fig. 1 is a schematic diagram of a voltage divider circuit with driving capability according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a voltage divider circuit with driving capability according to an embodiment of the present application.
Fig. 3 is a circuit diagram of a voltage divider circuit with driving capability according to an embodiment of the present application.
Detailed Description
The following describes in further detail the embodiments of the present application with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a voltage divider circuit with driving capability according to an embodiment of the application, including: the first current mirror circuit 10, the second current mirror circuit 20, the operational amplifier 30, the first resistor R1 and the second resistor R2.
The first current mirror circuit 10 has a first terminal 101, a second terminal 102, a third terminal 103, and a fourth terminal 104. The fourth terminal 104 of the first current mirror circuit 10 is used as the output terminal Vout of the voltage divider circuit. The operational amplifier 30 has a first input 301, a second input 302 and an output 303. A first input 301 of the operational amplifier 30 is connected to the first terminal 101 of the first current mirror circuit 10. The output 303 of the operational amplifier 30 is connected to the third terminal 103 of the first current mirror circuit 10. The second current mirror circuit 20 has a first terminal 201, a second terminal 202, and a third terminal 203. The second terminal 202 of the second current mirror circuit 20 is connected to the second terminal 102 of the first current mirror circuit 10. In one embodiment, the first current mirror circuit 10 and the second current mirror circuit 20 are used to generate the mirror current.
The first terminal 401 of the first resistor R1 is connected to the first terminal 201 of the second current mirror circuit 20, and the second terminal 402 of the first resistor R1 is connected to the first input terminal 301 of the operational amplifier 30 and the first terminal 101 of the first current mirror circuit 10. The first terminal 501 of the second resistor R2 is connected to the fourth terminal 104 of the first current mirror circuit 10. In an embodiment, the first resistor R1 and the second resistor R2 may be external resistor elements of the voltage divider circuit with driving capability of the present application or built-in resistor elements integrated into the voltage divider circuit with driving capability of the present application.
In an embodiment, the voltage dividing circuit with driving capability can be used to measure the voltage of the electronic device 60, for example, the electronic device 60 can be a lithium battery module with multiple lithium battery cells connected in series, and the voltage dividing circuit of the present application can be used to measure each of the battery cells in the battery module. In practical applications, the first terminal 401 of the first resistor R1 may be connected to one terminal of the electronic device 60, and the second input 302 of the operational amplifier 30 is connected to the other terminal of the electronic device 60.
In an embodiment, a third resistor R3 may be disposed between the electronic device 60 and the first end 401 of the first resistor R1, and a fourth resistor R4 may be disposed between the electronic device 60 and the second input end 302 of the operational amplifier 30. The third resistor R3 and the fourth resistor R4 may be used for bandwidth limited filtering.
In one embodiment, when the voltage divider circuit is used to measure an electronic device, the current value flowing through the first end 101 of the first current mirror circuit 10 and the current value flowing through the first end 201 of the second current mirror circuit 20 have the same current value. In this embodiment, the current flowing through the first terminal 101 of the first current mirror circuit 10 and the first terminal 201 of the second current mirror circuit 20 is defined as the first current I1. The current flowing through the second terminal 102 of the first current mirror circuit 10 and the current flowing through the second terminal 202 of the second current mirror 20 have the same current value, and in this embodiment, the current flowing through the second terminal 102 of the first current mirror circuit 10 and the second terminal 202 of the second current mirror circuit 20 is defined as the second current I2.
In an embodiment, the first current I1 and the second current I2 have a proportional relationship, and the current value of the fourth terminal 104 of the first current mirror is the sum of the first current I1 and the second current I2. The proportional relationship between the first current I1 and the second current I2 may be set by the dimension of the semiconductor device selected by the current mirror circuit.
Fig. 2 is a circuit diagram illustrating a structure of the voltage dividing circuit with driving capability shown in fig. 1 according to an embodiment of the present application.
Referring to fig. 2, in the present embodiment, the first current mirror circuit 10 includes a first power tube M1 and a second power tube M2. The gates of the first power tube M1 and the second power tube M2 are connected to each other. The second current mirror circuit 20 includes a third power transistor M3 and a fourth power transistor M4. The gates of the third power tube M3 and the fourth power tube M4 are connected to each other, and the gate and the drain of the fourth power tube M4 are connected to each other. The first input 301 of the operational amplifier 30 is connected to the drain of the first power transistor M1. The output end 303 of the operational amplifier 30 is connected to the gate of the first power transistor M1 and the gate of the second power transistor M2.
In one embodiment, the first power tube M1 and the second power tube M2 are NMOS; the third power tube M3 and the fourth power tube M4 are PMOS; the first input 301 of the operational amplifier is a non-inverting input and the second input 302 is an inverting input.
In an embodiment, the circuit of the voltage divider circuit with driving capability of the present application may include a first resistor R1 and a second resistor R2, wherein the first resistor R1 and the second resistor R2 may be external resistor elements of the voltage divider circuit or built-in resistor elements integrated into the voltage divider circuit of the present application.
The first end 401 of the first resistor R1 is connected to the drain of the third power transistor M3. The second terminal 402 of the first resistor R1 is connected to the drain of the first power transistor M1 and the first input terminal 301 of the operational amplifier 30.
The drain electrode of the fourth power tube M4 is connected with the drain electrode of the second power tube M2. The first end 501 of the second resistor R2 is connected to the sources of the first power tube M1 and the second power tube M2 and the output end Vout of the voltage divider circuit of the present application. The second terminal 502 of the second resistor R2 is grounded. The sources of the third power tube M3 and the fourth power tube M4 are connected to the power supply Vdd.
In an embodiment, when the voltage divider circuit with driving capability of the present application is in operation, the first input terminal 401 of the first resistor R1 is connected to the first terminal of the electronic device 60 to be tested. The second input 302 of the operational amplifier 30 is adapted to be connected to a second terminal of the electronic device 60 to be tested.
In an embodiment, the voltage divider circuit of the present application includes a third resistor R3 and a fourth resistor R4, wherein two ends of the third resistor R3 are respectively connected to the first end of the electronic device 60 to be detected and the first end 401 of the first resistor R1; both ends of the fourth resistor R4 are respectively connected to the second end of the electronic device 60 to be tested and the second end 302 of the operational amplifier 30. The third resistor R3 and the fourth resistor R4 are used for bandwidth limited filtering.
The first terminal of the electronic device 60 to be tested has a voltage V1, and the second terminal has a voltage V2. When the detection is performed, the voltage at the first end 401 of the first resistor R1 is the voltage V1, the voltage V2 at the second end 402 of the electronic device to be detected is input to the second input end 302 of the operational amplifier 30, and the second input end 302 of the operational amplifier 30 is equipotential with the first input end 301, so that the voltage at the second end 402 of the first resistor R1 is the voltage V2.
When the terminal voltage of the first terminal 401 of the first resistor R1 is the voltage V1 and the terminal voltage of the second terminal 402 is the voltage V2, the first current I1 flowing through the first resistor R1 is (V1-V2)/R1, and the first current I1 also flows through the first power tube M1. The gates of the first power tube M1 and the second power tube M2 are connected with each other, and the sources of the first power tube M1 and the second power tube M2 are connected with each other to form a current mirror so as to obtain mirror current. In this embodiment, the first power tube M1 and the second power tube M2 are NMOS and have equal dimensions. Therefore, the second current I2 flowing through the second power tube M2 will be equal to the first current I1 flowing through the first power tube, which is equivalent to the second current I2 flowing through the second power tube M2 mirroring the first current I1 flowing through the first power tube M1.
The second current I2 flowing through the second power tube M2 also flows through the fourth power tube M4, and the third power tube M3 and the fourth power tube M4 form a current mirror, and in this embodiment, the third power tube M3 and the fourth power tube M4 are P-type and have the same size. Thus, the current flowing through the third power transistor M3 may mirror the current flowing through the fourth power transistor M4 such that the current of the third power transistor M3 is equal to the current flowing through the fourth power transistor M4. The current flowing through the fourth power tube M4 is the second current I2, so the current value flowing through the third power tube M3 is also equal to the second current I2, and because the second current I2 is equal to the first current I1, the current value flowing through the third power tube M3 is also equal to the first current I1 flowing through the first resistor R1. The current flowing through the third power tube M3 after mirroring corresponds to the first choke I1 flowing into the first resistor R1 to reduce the current flowing through the third resistor R3, so that the terminal voltage of the first terminal 401 of the first resistor R1 approaches the voltage V1 infinitely.
Since both the first current I1 flowing through the first power M1 and the second current I2 flowing through the second power tube M2 flow into the second resistor R2, the current flowing through the second resistor R2 is twice the current flowing through the first resistor R1. The voltage at the first terminal 501 of the second resistor R2 is 2 x (V1-V2) R2/R1, and the terminal voltage of the second resistor R2 is the terminal voltage of the output terminal voltage Vout. Therefore, the voltage dividing circuit with driving capability of the present application can divide the voltage of the electronic device 60 to meet the range of the subsequent device by adjusting the ratio of the second resistor R2 to the first resistor R1, and can obtain a larger driving capability.
In an embodiment, the width-to-length ratio of the first power tube M1, the second power tube M2, the third power tube M3 and the fourth power tube M4 can be adjusted so that the current flowing through the second resistor R2 can be greater than 2 times the current flowing through the first resistor R1.
Fig. 3 is a circuit diagram illustrating a structure of the voltage dividing circuit with driving capability shown in fig. 1 according to an embodiment of the present application.
Referring to fig. 3, in the present embodiment, the first current mirror circuit 10 includes a first power tube M1 and a second power tube M2. The gates of the first power tube M1 and the second power tube M2 are connected to each other. The second current mirror circuit 20 includes a third power transistor M3 and a fourth power transistor M4. The gates of the third power tube M3 and the fourth power tube are connected with each other, and the gate and the drain of the fourth power tube M4 are connected with each other. The first input 301 of the operational amplifier 30 is connected to the drain of the first power transistor M1. The output end 303 of the operational amplifier 30 is connected to the gate of the first power transistor M1 and the gate of the second power transistor M2.
In one embodiment, the first power tube M1 and the second power tube M2 are PMOS; the third power tube M3 and the fourth power tube M4 are NMOS; the first input 301 of the operational amplifier is a non-inverting input.
In an embodiment, the circuit of the voltage divider circuit with driving capability of the present application may include a first resistor R1 and a second resistor R2, wherein the first resistor R1 and the second resistor R2 may be external resistor elements of the voltage divider circuit or built-in resistor elements integrated into the voltage divider circuit.
The first end 401 of the first resistor R1 is connected to the drain of the first power tube M1 and the first input end 301 of the operational amplifier 30; the second end 402 of the first resistor R1 is connected to the drain of the third power transistor M3.
The drain of the fourth power tube M2 is connected with the drain of the second power tube M4. The first end 501 of the second resistor R2 is connected to the sources of the first power tube M1 and the second power tube M2 and the output end Vout of the voltage divider circuit with driving capability of the present application. The second terminal 502 of the second resistor R2 is connected to the power supply Vdd. The source of the third power tube M3 and the source of the fourth power tube M4 are grounded.
In an embodiment, when the voltage divider circuit with driving capability of the present application is in operation, the second input terminal 302 of the operational amplifier 30 is used for being connected to the first terminal of the electronic device 60 to be tested. The second terminal 402 of the first resistor R1 is configured to be connected to a second terminal of the electronic device 60 to be tested.
In an embodiment, the voltage divider further includes a third resistor R3 and a fourth resistor R4. Two ends of the third resistor R3 are respectively connected to the first end of the electronic device 60 to be detected and the second input end 302 of the operational amplifier 30; the two ends of the fourth resistor R4 are respectively connected to the second end of the electronic device 60 to be tested and the second end 402 of the first resistor R1. The third resistor R3 and the fourth resistor R4 are used for bandwidth limited filtering. In one embodiment, the electronic device to be tested may be a single-stage lithium battery in a battery module.
The first terminal of the electronic device 60 to be tested has a voltage V1, and the second terminal has a voltage V2. When the detection is performed, the voltage at the second end 402 of the first resistor R1 is the voltage V2, the voltage V1 at the first end of the electronic device 60 to be detected is input to the second input end 302 of the operational amplifier 30, and the second input end 302 of the operational amplifier 30 is equipotential with the first input end 301, so that the voltage at the first end 401 of the first resistor R1 is the voltage V1.
When the terminal voltage of the first terminal 401 of the first resistor R1 is the voltage V1 and the terminal voltage of the second terminal 402 is the voltage V2, the first current I1 flowing through the first resistor R1 is (V1-V2)/R1, and the first current I1 also flows through the first power tube M1. The gates of the first power tube M1 and the second power tube M2 are connected with each other, and the sources are connected with each other to form a current mirror so as to obtain a mirror current. In this embodiment, the first power tube M1 and the second power tube M2 are PMOS and have the same size. Therefore, the second current I2 flowing through the second power tube M2 is equal to the first current I1 flowing through the first power tube M1, and the second current I2 corresponding to the second power tube M2 mirrors the first current I1 of the first power tube M1.
The second current I2 flowing through the second power tube M2 also flows through the fourth power tube M4. The third power tube M3 and the fourth power tube M4 form a current mirror, and in this embodiment, the third power tube M3 and the fourth power tube M4 may be N-type and have equal dimensions. Accordingly, the current flowing through the third power tube M3 may mirror the current flowing through the fourth power tube M4 such that the value of the current flowing through the third power tube M3 is equal to the value of the current flowing through the fourth power tube M4. The current flowing through the fourth power tube M4 is the second current I2, so the current value flowing through the third power tube M3 is also equal to the second current I2, and because the second current I2 is equal to the first current I1, the current flowing through the third power tube M3 is also equal to the first current I1 flowing through the first resistor R1. The current flowing through the third power tube M3 after mirroring corresponds to the first choke I1 flowing into the first resistor R1, so as to reduce the current flowing through the third resistor R3, and thus the terminal voltage of the second terminal 402 of the first resistor R1 is infinitely close to the voltage V2.
Since both the first current I1 flowing through the first power M1 and the second current I2 flowing through the second power tube M2 flow through the second resistor R2, the current flowing through the second resistor R2 is twice the current flowing through the first resistor R1. The voltage at the first terminal 501 of the second resistor R2 is 2 x (V1-V21) R2/R1, and the terminal voltage of the second resistor R2 is the terminal voltage of the output terminal voltage Vout. Therefore, the voltage dividing circuit with driving capability of the present application can divide the voltage of the electronic device 60 to meet the range of the subsequent device by adjusting the ratio of the second resistor R2 to the first resistor R1, and can obtain a larger driving capability.
In an embodiment, the width-to-length ratio of the first power tube M1, the second power tube, the third power tube M3 and the fourth power tube M4 can be adjusted so that the current flowing through the second resistor R2 can be greater than 2 times the current flowing through the first resistor R1.
Embodiments in accordance with the present application, as described above, are not intended to be exhaustive or to limit the application to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best utilize the application and various modifications as are suited to the particular use contemplated. The application is limited only by the claims and the full scope and equivalents thereof.
Claims (11)
1. A voltage divider circuit with driving capability, comprising:
A first current mirror circuit having a first end, a second end, a third end, and a fourth end, the fourth end of the first current mirror circuit being used as an output end of the voltage divider circuit;
The operational amplifier is provided with a first input end, a second input end and an output end, wherein the first input end of the operational amplifier is connected to the first end of the first current mirror circuit, and the output end of the operational amplifier is connected to the third end of the first current mirror circuit;
A second current mirror circuit having a first end, a second end and a third end, the second end of the second current mirror circuit being connected to the second end of the first current mirror circuit,
Wherein a value of a current flowing through the first end of the first current mirror circuit is equal to a value of a current flowing through the first end of the second current mirror circuit, and the value is defined as a first current; the second end of the first current mirror circuit and the second end of the second current mirror circuit have the same current value, and are defined as second current, the first current and the second current have a proportional relation, and the current value of the fourth end of the first current mirror is the sum of the first current and the second current.
2. The voltage divider circuit with driving capability according to claim 1, wherein the first end of the first current mirror circuit is connected to a first end of a first resistor, and the first input end of the operational amplifier is connected to a second end of the first resistor.
3. The voltage divider circuit with driving capability according to claim 1, wherein the fourth terminal of the first current mirror circuit is connected to the first terminal of the second resistor.
4. The voltage divider circuit with driving capability according to claim 1, wherein the first current mirror circuit comprises a first power tube and a second power tube, the gate of the first power tube, the gate of the second power tube and the output end of the operational amplifier are connected with each other, and the source of the first power tube is connected with the source of the second power tube to form the fourth end of the first current mirror circuit.
5. The voltage divider circuit with driving capability according to claim 1, wherein the voltage divider circuit comprises: a first resistor having a first end and a second end;
a second resistor having a first end and a second end;
The first current mirror circuit comprises a first power tube and a second power tube,
The grid electrode of the first power tube, the grid electrode of the second power tube and the output end of the operational amplifier are connected with each other, the source electrode of the first power tube is connected with the source electrode of the second power tube to form the fourth end of the first current mirror circuit, and the first end of the second resistor is connected with the fourth end of the first current mirror circuit.
6. The voltage divider circuit with driving capability according to claim 2, wherein the second current mirror circuit comprises a third power tube and a fourth power tube, the gate of the third power tube and the gate of the fourth power tube are connected with each other, the gate of the fourth power tube is connected with the drain, the drain of the third power tube is used for being connected with the first end of the first resistor, and the drain of the fourth power tube is connected with the second end of the first current mirror circuit.
7. The voltage divider circuit with driving capability according to claim 1, wherein the voltage divider circuit comprises:
a first resistor having a first end and a second end;
A second resistor having a first end and a second end;
The first current mirror circuit comprises a first power tube and a second power tube;
The second current mirror circuit comprises a third power tube and a fourth power tube,
The grid electrode of the first power tube, the grid electrode of the second power tube and the output end of the operational amplifier are connected with each other, the source electrode of the first power tube and the source electrode of the second power tube are connected with each other to form a fourth end of the first current mirror circuit, and the first end of the second resistor is connected with the fourth end of the first current mirror circuit;
The grid electrode of the third power tube is connected with the grid electrode of the fourth power tube, the grid electrode of the fourth power tube is connected with the drain electrode of the fourth power tube, the drain electrode of the third power tube is used for being connected with the first end of the first resistor, and the drain electrode of the fourth power tube is connected with the second end of the first current mirror circuit.
8. The voltage divider circuit with driving capability according to claim 7, wherein when the first power tube and the second power tube are both N-channel power tubes, the third power tube and the fourth power tube are both P-channel power tubes; when the first power tube and the second power tube are both P-channel power tubes, the third power tube and the fourth power tube are both N-channel power tubes.
9. The voltage divider circuit with driving capability according to claim 8, wherein when the first power tube and the second power tube are both N-channel power tubes, the third power tube and the fourth power tube are both P-channel power tubes, the second end of the second resistor is used for grounding, and the sources of the third power tube and the fourth power tube are used for connecting with a power supply end; when the first power tube and the second power tube are both P-channel power tubes, the third power tube and the fourth power tube are both N-channel power tubes, the second end of the second resistor is used for being connected with a power supply end, and the sources of the third power tube and the fourth power tube are used for being grounded.
10. The voltage divider circuit with driving capability of claim 7, for measuring voltage of an electronic device, wherein the measured voltage of the electronic device is attenuated in equal proportion by adjusting a ratio of the first resistor to the second resistor.
11. The voltage divider circuit with driving capability of claim 7, wherein the first end of the first resistor is used for measuring a voltage of an electronic device, the second input end of the operational amplifier is used for connecting with one end of the electronic device, the third resistor is arranged between the electronic device and the first end of the first resistor, and the fourth resistor is arranged between the electronic device and the operational amplifier.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410232711 | 2024-02-29 | ||
| CN2024102327115 | 2024-02-29 |
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| CN117908616A true CN117908616A (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410299630.7A Pending CN117908616A (en) | 2024-02-29 | 2024-03-15 | Voltage dividing circuit with driving capability |
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| CN104953658A (en) * | 2015-06-19 | 2015-09-30 | 南京守护神半导体有限公司 | Battery voltage conversion circuit and battery management system |
| CN111435152A (en) * | 2019-01-14 | 2020-07-21 | 南京苏梦电子科技有限公司 | Battery voltage detection circuit and battery voltage detection module of battery pack |
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2024
- 2024-03-15 CN CN202410299630.7A patent/CN117908616A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835360A (en) * | 2005-03-07 | 2006-09-20 | 美国凹凸微系有限公司 | Battery state monitoring circuitry with low power consumption during a stand-by-state of a battery pack |
| US20140035360A1 (en) * | 2011-01-05 | 2014-02-06 | Samsung Sdi Co., Ltd. | Battery with Autonomous Cell Balancing |
| CN102353904A (en) * | 2011-06-30 | 2012-02-15 | 上海新进半导体制造有限公司 | Battery voltage detection module and circuit thereof, and logic transmission circuit |
| CN202548685U (en) * | 2011-12-21 | 2012-11-21 | 比亚迪股份有限公司 | Reference voltage buffer circuit |
| CN104953658A (en) * | 2015-06-19 | 2015-09-30 | 南京守护神半导体有限公司 | Battery voltage conversion circuit and battery management system |
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