CN114039602B - High-precision common mode conversion circuit supporting high-voltage input - Google Patents
High-precision common mode conversion circuit supporting high-voltage input Download PDFInfo
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- H—ELECTRICITY
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- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
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- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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Abstract
The invention relates to the technical field of voltage sampling of batteries, in particular to a high-precision common-mode conversion circuit supporting high-voltage input, which is used for sampling the voltage of a single battery in a series battery pack and comprises a first differential input resistor R1PA second differential input resistor R1NA first differential feedback resistor R2PA second differential feedback resistor R2NA first differential feedback capacitor C1PA second differential feedback capacitor C1NAnd a high voltage amplifier circuit a 1. According to the high-precision common mode conversion circuit supporting high-voltage input, under the withstand voltage rule of a high-voltage transistor, a battery voltage signal of a high-voltage domain is converted into a low-voltage domain so as to be processed by a post-stage circuit; the high-precision battery voltage signal acquisition and processing device realizes high-precision acquisition and processing of the battery voltage signal in a high-voltage domain, and is suitable for acquiring the state of any battery in a battery pack formed by connecting a plurality of batteries in series.
Description
Technical Field
The invention relates to the technical field of voltage sampling of batteries, in particular to a high-precision common-mode conversion circuit supporting high-voltage input.
Background
In a new energy vehicle, a battery pack is one of the most core components, and a battery is used as a power source of the electric vehicle, so that the safety and the reliability of the battery are very important, and the monitoring and the management of the working state of the battery pack are indispensable.
To monitor and manage the operating status of the battery pack, the operating status information of each single battery is obtained first, but the battery pack is formed by connecting a plurality of batteries in series, as shown in fig. 3, the voltage of the positive electrode of the 1 st battery is VCELL1… …, the voltage of the positive electrode of the Nth cell is VCELLNThe voltage of the negative electrode of the first battery is grounded; assuming that the maximum voltage of a single battery is 5V, the maximum voltage of the voltage to be detected reaches 50V, and the voltage of the positive end and the voltage of the negative end of the single battery as the topmost single battery are respectively 50V and 45V; this need for high precision voltage sampling at high voltages,the difficulty of obtaining the battery operating state information is increased, so that the high-precision common mode conversion circuit supporting high-voltage input is required to be used firstly to convert the battery voltage information in the high-voltage domain to the low-voltage domain for the subsequent circuit to process, as shown in fig. 4, the input signal VCELL1…… VCELLNI.e., the voltages of the positive electrodes of the cells corresponding to section 1 through section N in fig. 3.
However, for the high-voltage transistor, the gate-source (VGS) of the transistor can only bear 5V, which brings difficulty to the design of the high-voltage conversion circuit, and how to convert the high-voltage signal of the battery pack into the low-voltage processable signal under the voltage-withstanding rule of the high-voltage transistor is difficult.
Disclosure of Invention
The invention provides a high-precision common mode conversion circuit supporting high-voltage input, which solves the problems and realizes high-precision conversion processing of input signals.
In order to realize the purpose of the invention, the adopted technical scheme is as follows: a high-precision common-mode conversion circuit supporting high-voltage input is used for sampling the voltage of a single battery in a series battery pack and comprises a first differential input resistor R1PA second differential input resistor R1NA first differential feedback resistor R2PA second differential feedback resistor R2NA first differential feedback capacitor C1PA second differential feedback capacitor C1NAnd a high voltage amplifier circuit A1, a first differential input resistor R1PConnected at a high level V of the input signalINPAnd a positive input terminal of the high-voltage amplifier circuit A1, and a second differential input resistor R1NConnected at a low level V of the input signalINNAnd the negative input end of the high-voltage amplifier circuit A1, and a first differential feedback resistor R2PAnd a first differential feedback capacitor C1PA second differential feedback resistor R connected in parallel between the positive input terminal of the high voltage amplifier circuit A1 and the negative output terminal of the high voltage amplifier circuit A12NAnd a second differential feedback capacitor C1NConnected in parallel between the negative input terminal of the high voltage amplifier circuit A1 and the positive output terminal of the high voltage amplifier circuit A1High level V of incoming signalINPConnecting the positive terminal of the series battery, inputting a signal at a low level VINNAnd connecting the negative ends of the series battery packs.
As an optimized solution of the present invention, the high voltage amplifier circuit a1 includes a first stage differential amplifier, which is used to provide voltage gain and convert the high voltage common mode signal component in the input signal into a low voltage common mode signal. (the differential input signal of the high voltage amplifier circuit a1 consists of a common mode signal superimposed on a differential mode signal).
As an optimized solution of the present invention, the high voltage amplifier circuit a1 further comprises a multi-stage amplifier consisting of one or two of a second stage output stage amplifier for providing higher voltage gain and a third stage source follower amplifier for isolating the second stage output stage amplifier from the equivalent output load of the high voltage amplifier circuit a 1.
As an optimized solution of the present invention, the first-stage differential amplifier includes a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, and an eighth transistor M8, the first transistor M1, the second transistor M2, the third transistor M3, and the fourth transistor M4 are all high voltage transistors, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7, and the eighth transistor M8 form a load circuit, a source of the first transistor M1 and a source of the second transistor M2 are all connected to a drain of the fourth transistor M4, and a gate of the first transistor M1 is connected to a positive input terminal V of the high voltage amplifier circuit a1AINPThe gate of the second transistor M2 is connected to the negative input terminal V of the high voltage amplifier circuit A1AINNThe drain of the first transistor M1 is connected with the negative output end V of the first stage differential amplifierA1ONThe drain of the second transistor M2 is connected with the positive output end V of the first stage differential amplifierA1OPThe third transistor M3 and the fourth transistor M4 are connected to form a current mirror circuit, the source of the third transistor M3 and the source of the fourth transistor M4 are connected to a high voltage power supply VDDH, and the gate of the third transistor M3 and the gate of the fourth transistor M4 are connected to the drain of the third transistor M3In addition, the grid of the fifth transistor M5 and the grid of the sixth transistor M6 are connected with the bias voltage V generated by the voltage reference in the circuitBN2The drain of the fifth transistor M5 is connected with the negative output end V of the first stage differential amplifierA1ONThe drain of the sixth transistor M6 is connected to the positive output terminal V of the first stage differential amplifierA1OPThe source of the fifth transistor M5 is connected to the drain of the seventh transistor M7, the source of the sixth transistor M6 is connected to the drain of the eighth transistor M8, and the gate of the seventh transistor M7 and the gate of the eighth transistor M8 are both connected to the common mode feedback circuit feedback voltage VCMFBTo each other, the source of the seventh transistor M7 and the source of the eighth transistor M8 are both grounded.
As an optimized scheme of the invention, the second-stage output stage amplifier comprises a ninth transistor M9, a tenth transistor M10, an eleventh transistor M11 and a twelfth transistor M12, the source of the ninth transistor M9 and the source of the tenth transistor M10 are grounded, and the gate of the ninth transistor M9 and the negative output end V of the first-stage differential amplifier are connected with each otherA1ONThe gate of the tenth transistor M10 is connected to the positive output terminal V of the first stage differential amplifierA1OPTo this end, the drain of the ninth transistor M9 is connected to the drain of the eleventh transistor M11, the drain of the tenth transistor M10 is connected to the drain of the twelfth transistor M12, the gate of the eleventh transistor M11 is connected to the gate of the twelfth transistor M12, and the source of the eleventh transistor M11 is connected to the source of the twelfth transistor M12.
As an optimized solution of the present invention, the third-stage source follower amplifier includes a thirteenth transistor M13, a fourteenth transistor M14, a fifteenth transistor M15 and a sixteenth transistor M16, the source of the thirteenth transistor M13 is connected to the source of the fourteenth transistor M14, the gate of the thirteenth transistor M13 is connected to the gate of the fourteenth transistor M14, the drain of the thirteenth transistor M13 is connected to the source of the fifteenth transistor M15, the gate of the fifteenth transistor M15 is connected to the drain of the ninth transistor M9, the drain of the fifteenth transistor M15 is connected to the drain of the sixteenth transistor M16, the gate of the sixteenth transistor M16 is connected to the drain of the tenth transistor M10, and the source of the sixteenth transistor M16 is connected to the drain of the fourteenth transistor M14.
As an optimized scheme of the invention, the high-precision common mode conversion circuit supporting high-voltage input further comprises a first compensation capacitor C1 and a second compensation capacitor C2, wherein the anode of the first compensation capacitor C1 is connected with the drain of the seventh transistor M7, the anode of the second compensation capacitor C2 is connected with the drain of the eighth transistor M8, the cathode of the first compensation capacitor C1 is connected with the positive output end V of the second-stage output-stage amplifierA2OPThe negative pole of the second compensation capacitor C2 is connected with the negative output end V of the second-stage output-stage amplifierA2ONAre connected.
The invention has the positive effects that: 1) according to the high-precision common mode conversion circuit supporting high-voltage input, under the withstand voltage rule of a high-voltage transistor, a battery voltage signal of a high-voltage domain is converted into a low-voltage domain so as to be processed by a post-stage circuit;
2) the high-precision common mode conversion circuit supporting high-voltage input realizes high-precision acquisition and processing of battery voltage signals in a high-voltage domain;
3) the high-precision common mode conversion circuit supporting high-voltage input is designed by the maximum voltage of each battery, so that the high-precision common mode conversion circuit is suitable for any feeding situation with insufficient voltage of a single battery or a plurality of batteries, and can realize the full-range real-time voltage acquisition in the use process of the batteries;
4) the invention has the advantages of simple circuit structure, good stability, high precision and low cost.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a closed loop circuit diagram of the present invention;
FIG. 2 is a circuit diagram of the high voltage amplifier circuit A1 of the present invention;
FIG. 3 is a schematic diagram of a series connection detected signal of a battery pack;
FIG. 4 is a block diagram of an application of the present invention;
FIG. 5 is an exemplary graph of input and output voltages of the present invention.
Detailed Description
As shown in FIG. 1, the invention discloses a high-voltage supporting deviceThe precision common mode conversion circuit is used for sampling the voltage of a single battery in a series battery pack and comprises a first differential input resistor R1PA second differential input resistor R1NA first differential feedback resistor R2PA second differential feedback resistor R2NA first differential feedback capacitor C1PA second differential feedback capacitor C1NAnd a high voltage amplifier circuit A1, a first differential input resistor R1PConnected at a high level V of the input signalINPAnd a positive input terminal of the high-voltage amplifier circuit A1, and a second differential input resistor R1NConnected at a low level V of the input signalINNAnd the negative input end of the high-voltage amplifier circuit A1, and a first differential feedback resistor R2PAnd a first differential feedback capacitor C1PA second differential feedback resistor R connected in parallel between the positive input terminal of the high voltage amplifier circuit A1 and the negative output terminal of the high voltage amplifier circuit A12NAnd a second differential feedback capacitor C1NConnected in parallel between the negative input terminal of the high voltage amplifier circuit A1 and the positive output terminal of the high voltage amplifier circuit A1, and input signal high level VINPConnecting the positive terminal of the series battery, inputting a signal at a low level VINNAnd connecting the negative ends of the series battery packs.
High-level V of input signal of high-precision common mode conversion circuit supporting high-voltage inputINPInput signal low level is VINN(ii) a The high level of the output signal is VOPThe low level of the output signal is VON. In particular, the first differential input resistance R1PRespectively with the high level V of the input signalINPAnd the positive input end V of the high-voltage amplifier circuit A1AINPConnected, second differential input resistor R1NRespectively with the low level V of the input signalINNAnd the negative input terminal V of the high-voltage amplifier circuit A1AINNConnecting; first differential feedback resistor R2PRespectively with the positive input terminal V of the high-voltage amplifier circuit A1AINPAnd the negative output terminal V of the high-voltage amplifier circuit A1AONConnecting; second differential feedback resistor R2NPositive input end and negative input end ofIs respectively connected with the negative input end V of the high-voltage amplifier circuit A1AINNAnd a positive output terminal V of the high-voltage amplifier circuit A1AOPConnecting; first differential feedback capacitor C1PRespectively with the positive input terminal V of the high-voltage amplifier circuit A1AINPAnd the negative output terminal V of the high-voltage amplifier circuit A1AONConnecting; second differential feedback capacitor C1NRespectively with the negative input terminal V of the high-voltage amplifier circuit A1AINNAnd a positive output terminal V of the high-voltage amplifier circuit A1AOPConnecting; positive output terminal V of high-voltage amplifier circuit a1AOPLow level V of direct and output signalONConnecting; the negative output end V of the high-voltage amplifier circuit A1AONHigh level V of direct and output signalOPAre connected.
As shown in fig. 2, the first stage differential amplifier is used to convert the high voltage common mode signal component in the input signal into a low voltage common mode signal. The first stage differential amplifier functions to provide voltage gain (the differential input signal of high voltage amplifier circuit a1, consisting of a common mode signal superimposed on a differential mode signal). The first-stage differential amplifier comprises a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7 and an eighth transistor M8, the first transistor M1, the second transistor M2, the third transistor M3 and the fourth transistor M4 are all high-voltage tubes, the first transistor M1, the second transistor M2, the third transistor M3 and the fourth transistor M4 work in a high-voltage domain, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7 and the eighth transistor M8 form a load circuit, a source of the first transistor M1 and a source of the second transistor M2 are all connected with a drain of the fourth transistor M4, a gate of the first transistor M1 is connected with a positive input terminal V1 of the high-voltage amplifier circuit A1AINPThe gate of the second transistor M2 is connected to the negative input terminal V of the high voltage amplifier circuit A1AINNThe drain of the first transistor M1 is connected with the negative output end V of the first stage differential amplifierA1ONThe drain of the second transistor M2 is connected with the positive output end V of the first stage differential amplifierA1OPConnected, the third transistor M3 and the fourth transistor M4 form a current mirror circuitA source of the third transistor M3 and a source of the fourth transistor M4 are connected to a high voltage power supply VDDH, a gate of the third transistor M3 and a gate of the fourth transistor M4 are connected to a drain of the third transistor M3, a gate of the fifth transistor M5 and a gate of the sixth transistor M6 are connected to a bias voltage V generated by a voltage reference inside the circuitBN2The drain of the fifth transistor M5 is connected with the negative output end V of the first stage differential amplifierA1ONThe drain of the sixth transistor M6 is connected to the positive output terminal V of the first stage differential amplifierA1OPThe source of the fifth transistor M5 is connected to the drain of the seventh transistor M7, the source of the sixth transistor M6 is connected to the drain of the eighth transistor M8, and the gate of the seventh transistor M7 and the gate of the eighth transistor M8 are both connected to the common mode feedback circuit feedback voltage VCMFBTo each other, the source of the seventh transistor M7 and the source of the eighth transistor M8 are both grounded. The first transistor M1-the eighth transistor M8 are differential amplifiers consisting of a high-voltage current mirror, a high-voltage input tube and a low-voltage load.
Common mode feedback circuit feedback voltage VCMFBIs the output voltage of the common mode feedback circuit, which samples the output positive and negative common mode values and feeds them back to the common mode feedback voltage point to stabilize the common mode of the circuit, the positive output end V of the first stage differential amplifierA1OPAnd the negative output end V of the first-stage differential amplifierA1ONOf (a) is a common-mode signal (V)A1OP+VA1ON) A/2, outputting a common-mode feedback voltage V after passing through a common-mode feedback circuitCMFB。
The high voltage amplifier circuit a1 includes a first stage differential amplifier, which is not limited to the cascod load of the present invention, but also includes a common current mirror load and other types of loads.
The high voltage amplifier circuit A1 further comprises a multi-stage amplifier consisting of one or both of a second stage output stage amplifier for increasing voltage gain and a third stage source follower amplifier for isolating the second stage output stage amplifier from the equivalent output load of the high voltage amplifier circuit A1. The high voltage amplifier circuit a1 is not limited to the three stage amplifier of the present invention, but includes any number of stages of the first stage amplifier.
Assuming that the resistance value selection ratio is:
R2P/R1P=1/2 （1）
the output common mode is arranged at
VDDL/2=5V/2=2.5V （2）
If the 10 th battery is detected and the maximum voltage of a single battery is 5V, the maximum voltage of the negative electrode is 45V, the maximum voltage of the positive electrode is 50V, and the voltage difference is 5VPPThen the final input to output relationship is shown in FIG. 5 (V)PPIs peak-to-peak voltage, wherein the input common-mode voltage VINCMDefined as high level V of input signalINPAnd low level V of input signalINNAverage value of (1), VINCM=(VINP+VINN) /2, and output a common mode voltage VOCMDefined as the high level V of the output signalOPAnd low level V of output signalONAverage value of (1), VOCM=(VOP+VON)/2。
The high level of the output signal is VOPComprises the following steps:
2.5V+5VPP/2/2=3.75V （3）
the low level of the output signal is VONComprises the following steps:
2.5V-5VPP/2/2=1.25V （4）
as shown in FIG. 2, the second stage output stage amplifier comprises a ninth transistor M9, a tenth transistor M10, an eleventh transistor M11 and a twelfth transistor M12, the source of the ninth transistor M9 and the source of the tenth transistor M10 are both grounded, and the gate of the ninth transistor M9 and the negative output end V of the first stage differential amplifier are connected to the same voltageA1ONThe gate of the tenth transistor M10 is connected to the positive output terminal V of the first stage differential amplifierA1OPTo the drain of the ninth transistor M9, the drain of the eleventh transistor M11, the drain of the tenth transistor M10, the drain of the twelfth transistor M12, the gate of the eleventh transistor M11 and the gate of the twelfth transistor M12, the source of the eleventh transistor M11 and the source of the twelfth transistor M12And (4) connecting.
The third-stage source follower amplifier comprises a thirteenth transistor M13, a fourteenth transistor M14, a fifteenth transistor M15 and a sixteenth transistor M16, wherein the source of the thirteenth transistor M13 is grounded, the source of the fourteenth transistor M14 is grounded, the gate of the thirteenth transistor M13 is connected with the gate of the fourteenth transistor M14, the drain of the thirteenth transistor M13 is connected with the source of the fifteenth transistor M15, the gate of the fifteenth transistor M15 is connected with the drain of the ninth transistor M9, the drain of the fifteenth transistor M15 is connected with the drain of the sixteenth transistor M16, the gate of the sixteenth transistor M16 is connected with the drain of the tenth transistor M10, and the source of the sixteenth transistor M16 is connected with the drain of the fourteenth transistor M14. The drain terminals of the fifteenth transistor M15 and the transistor M16 are both connected to the low voltage power supply VDDL; the gates of the transistors M15 and M16 and the positive output terminal V of the second stage output stage amplifierA2OPAnd the negative output end V of the second-stage output stage amplifierA2ONConnecting; the sources of the fifteenth transistor M15 and the sixteenth transistor M16 are respectively connected to the positive output terminal V of the high voltage amplifier circuit a1AOPAnd the negative output terminal V of the high-voltage amplifier circuit A1AONAre connected.
The high-precision common mode conversion circuit supporting high-voltage input further comprises a first compensation capacitor C1 and a second compensation capacitor C2, wherein the anode of the first compensation capacitor C1 is connected with the drain electrode of the seventh transistor M7, the anode of the second compensation capacitor C2 is connected with the drain electrode of the eighth transistor M8, the cathode of the first compensation capacitor C1 is connected with the positive output end V of the second-stage output-stage amplifierA2OPThe negative pole of the second compensation capacitor C2 is connected with the negative output end V of the second-stage output-stage amplifierA2ONAre connected.
Input common mode signal V of high-voltage amplifier circuit A1AINCM(defined as the positive input terminal V of the high voltage amplifier circuit A1AINPAnd the negative input terminal V of the high-voltage amplifier circuit A1AINNAverage value of (V)AINP+VAINN) /2) is input common mode voltage VINCMAnd an output common mode voltage VOCMThrough a resistance R1PAnd a resistor R2PIs obtained by partial pressure of
VAINCM=VOCM+（（VINCM-VOCM）R2P/（R1P+R2P）） （5）
When inputting the common mode voltage VINCMWhen the voltage is high, the input common mode signal V of the high-voltage amplifier circuit A1AINCMAt this time, for the input stage of the high-voltage amplifier circuit a1 shown in fig. 2, the absolute values of the voltages at the gates and the sources of the first transistor M1 and the second transistor M2 are both high voltages, but the voltage difference (VSG) between the gates and the sources of the first transistor M1 and the second transistor M2 is low voltage, and at the same time, the drains of the first transistor M1 and the second transistor M2 are both low voltages, but for the high-voltage tubes, the voltage difference (VGD) between the gates and the drains of the first transistor M1 and the second transistor M2 and the voltage difference (VSD) between the sources and the drains of the first transistor M1 and the second transistor M2 can both bear high voltages, so the first transistor M1 and the second transistor M2 can normally operate; also, there is no problem with the fourth transistor M4, and details thereof are not repeated; the circuits after the drain terminals of the first transistor M1 and the second transistor M2 are all operated in the low voltage domain and are not affected by the input high voltage.
It should be noted that, for the high voltage amplifier circuit a1 in the high precision common mode conversion circuit supporting high voltage input, the change of the low voltage partial load circuit type of the first stage amplifier, and the selection and architecture change of the low voltage domain amplifier stage (starting from the second stage amplifier) thereof are also considered as the protection scope of the present invention without departing from the core technical principle of the present invention.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A high-precision common mode conversion circuit supporting high-voltage input is characterized in that:the voltage sampling circuit is used for sampling the voltage of a single battery in a series battery pack and comprises a first differential input resistor R1PA second differential input resistor R1NA first differential feedback resistor R2PA second differential feedback resistor R2NA first differential feedback capacitor C1PA second differential feedback capacitor C1NAnd a high voltage amplifier circuit A1, a first differential input resistor R1PConnected at a high level V of the input signalINPAnd a positive input terminal of the high-voltage amplifier circuit A1, and a second differential input resistor R1NConnected at a low level V of the input signalINNAnd the negative input end of the high-voltage amplifier circuit A1, and a first differential feedback resistor R2PAnd a first differential feedback capacitor C1PA second differential feedback resistor R connected in parallel between the positive input terminal of the high voltage amplifier circuit A1 and the negative output terminal of the high voltage amplifier circuit A12NAnd a second differential feedback capacitor C1NConnected in parallel between the negative input terminal of the high voltage amplifier circuit A1 and the positive output terminal of the high voltage amplifier circuit A1, and input signal high level VINPConnecting the positive terminal of the series battery, inputting a signal at a low level VINNConnecting the negative ends of the series battery packs; the high-voltage amplifier circuit A1 comprises a first-stage differential amplifier for converting high-voltage common-mode signal components in an input signal into low-voltage common-mode signals; the high-voltage amplifier circuit A1 further comprises a multistage amplifier consisting of a second-stage output-stage amplifier and a third-stage source follow-up amplifier, wherein the second-stage output-stage amplifier is used for increasing the voltage gain, and the third-stage source follow-up amplifier is used for isolating the second-stage output-stage amplifier from an equivalent output load of the high-voltage amplifier circuit A1; the first-stage differential amplifier comprises a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7 and an eighth transistor M8, wherein the first transistor M1, the second transistor M2, the third transistor M3 and the fourth transistor M4 are all high-voltage tubes, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7 and the eighth transistor M8 form a load circuit, and a source of the first transistor M1 and a source of the second transistor M2Are connected to the drain of the fourth transistor M4, the gate of the first transistor M1 is connected to the positive input terminal V of the high voltage amplifier circuit a1AINPThe gate of the second transistor M2 is connected to the negative input terminal V of the high voltage amplifier circuit A1AINNThe drain of the first transistor M1 is connected with the negative output end V of the first stage differential amplifierA1ONThe drain of the second transistor M2 is connected with the positive output end V of the first stage differential amplifierA1OPThe third transistor M3 and the fourth transistor M4 are connected to form a current mirror circuit, the source of the third transistor M3 and the source of the fourth transistor M4 are connected to a high voltage power supply VDDH, the gate of the third transistor M3 and the gate of the fourth transistor M4 are connected to the drain of the third transistor M3, the drain of the third transistor M3 is connected to ground through a current source I1, and the gate of the fifth transistor M5 and the gate of the sixth transistor M6 are connected to a bias voltage V generated by a voltage reference in the circuitBN2The drain of the fifth transistor M5 is connected with the negative output end V of the first stage differential amplifierA1ONThe drain of the sixth transistor M6 is connected to the positive output terminal V of the first stage differential amplifierA1OPThe source of the fifth transistor M5 is connected to the drain of the seventh transistor M7, the source of the sixth transistor M6 is connected to the drain of the eighth transistor M8, and the gate of the seventh transistor M7 and the gate of the eighth transistor M8 are both connected to the common mode feedback circuit feedback voltage VCMFBTo each other, the source of the seventh transistor M7 and the source of the eighth transistor M8 are both grounded.
2. A high-precision common-mode conversion circuit supporting high-voltage input according to claim 1, wherein: the second stage output stage amplifier comprises a ninth transistor M9, a tenth transistor M10, an eleventh transistor M11 and a twelfth transistor M12, the source of the ninth transistor M9 and the source of the tenth transistor M10 are all grounded, and the gate of the ninth transistor M9 is connected with the negative output end V of the first stage differential amplifierA1ONThe gate of the tenth transistor M10 is connected to the positive output terminal V of the first stage differential amplifierA1OPTo which the drain of the ninth transistor M9 is connected to the drain of the eleventh transistor M11, the drain of the tenth transistor M10 is connected to the drain of the twelfth transistor M12,a gate of the eleventh transistor M11 is connected to a gate of the twelfth transistor M12, and a source of the eleventh transistor M11 is connected to a source of the twelfth transistor M12.
3. A high-precision common-mode conversion circuit supporting high-voltage input according to claim 2, wherein: the third-stage source follower amplifier comprises a thirteenth transistor M13, a fourteenth transistor M14, a fifteenth transistor M15 and a sixteenth transistor M16, wherein the source of the thirteenth transistor M13 is grounded, the source of the fourteenth transistor M14 is grounded, the gate of the thirteenth transistor M13 is connected with the gate of the fourteenth transistor M14, the drain of the thirteenth transistor M13 is connected with the source of the fifteenth transistor M15, the gate of the fifteenth transistor M15 is connected with the drain of the ninth transistor M9, the drain of the fifteenth transistor M15 is connected with the drain of the sixteenth transistor M16, the gate of the sixteenth transistor M16 is connected with the drain of the tenth transistor M10, and the source of the sixteenth transistor M16 is connected with the drain of the fourteenth transistor M14.
4. A high-precision common-mode conversion circuit supporting high-voltage input according to any one of claims 1 to 3, characterized in that: the high-precision common mode conversion circuit supporting high-voltage input further comprises a first compensation capacitor C1 and a second compensation capacitor C2, the anode of the first compensation capacitor C1 is connected with the drain electrode of the seventh transistor M7, the anode of the second compensation capacitor C2 is connected with the drain electrode of the eighth transistor M8, the cathode of the first compensation capacitor C1 is connected with the positive output end V of the second-stage output electrode amplifierA2OPThe negative pole of the second compensating capacitor C2 is connected with the negative output end V of the second stage output pole amplifierA2ONAre connected.
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| CN115395906B (en) * | 2022-10-28 | 2023-02-28 | 奉加微电子（昆山）有限公司 | Low-power consumption broadband common mode signal detection circuit suitable for ultralow voltage |
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Denomination of invention: A high-precision common mode conversion circuit that supports high-voltage input Granted publication date: 20220412 Pledgee: Bank of Nanjing Jiangbei District branch of Limited by Share Ltd. Pledgor: Yisiyuan semiconductor Nanjing Co.,Ltd. Registration number: Y2024980015816 |