CN109213251B - Voltage sampling scaling circuit based on BMS - Google Patents
Voltage sampling scaling circuit based on BMS Download PDFInfo
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- CN109213251B CN109213251B CN201811294152.1A CN201811294152A CN109213251B CN 109213251 B CN109213251 B CN 109213251B CN 201811294152 A CN201811294152 A CN 201811294152A CN 109213251 B CN109213251 B CN 109213251B
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- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The present application relates to a voltage sampling scaling circuit based on BMS, this voltage sampling scaling circuit includes: a power module comprising a plurality of power output terminals; the voltage sampling module is electrically connected with the power supply module through the plurality of direct current power supply output ends, and two paths of the voltage sampling module are extracted from the plurality of power supply output ends to be used as output ends of the voltage sampling module; and the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module, and scales the voltage according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset value. The invention realizes the sampling of multi-path voltage and the effective scaling of high voltage through the voltage scaling module, and in addition, the voltage sampling scaling circuit provided by the invention has the advantages of high scaling precision, easy control and low cost.
Description
Technical Field
The invention relates to the technical field of circuit design of semiconductor chips, in particular to a voltage sampling scaling circuit based on a BMS (battery management system).
Background
At present, with the development of semiconductor chip technology, the circuit design of the semiconductor chip is more and more complex. Among them, in a battery management system in a semiconductor chip, the design of a circuit is particularly important. A Battery Management System (BMS), which is an english language, generally has a function of measuring a battery voltage, and prevents or avoids abnormal situations such as overdischarge, overcharge, and over-temperature of the battery. As technology advances, it has been applied to more and more intelligent devices and has gradually increased many functions.
In the conventional technology, the battery management system usually does not have an effective voltage scaling function, which results in that when there are more batteries connected in series and the voltage is higher, the voltage cannot be scaled to a reasonable range effectively.
Disclosure of Invention
In view of the above, it is desirable to provide a BMS-based voltage sampling scaling circuit that can achieve precise control of voltage scaling.
A BMS-based voltage sampling scaling circuit, the voltage sampling scaling circuit comprising:
a power module comprising a plurality of power output terminals;
the voltage sampling module is electrically connected with the power supply module through the plurality of direct current power supply output ends, and two paths of the voltage sampling module are extracted from the plurality of power supply output ends to be used as output ends of the voltage sampling module;
and the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module, and scales the voltage according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset value.
In one embodiment, the voltage sampling scaling circuit further comprises:
the amplifying module comprises a charge sampling amplifier, and the input end of the charge sampling amplifier is electrically connected with the output end of the voltage scaling module.
In one embodiment, the power module comprises:
and the output ends of the battery packs are respectively led out from two ends of each battery in the battery packs and serve as a plurality of power supply output ends of the power supply module.
In one embodiment, the voltage sampling module comprises:
the input end of the multi-path selector is respectively electrically connected with the power supply output ends of the power supply module, and the multi-path selector is used for selecting two paths from the power supply output ends of the power supply module to serve as a first output end and a second output end of the multi-path selector.
In one embodiment, the first output terminal and the second output terminal of the multiplexer are electrically connected to the voltage scaling module, respectively, and the voltage scaling module is configured to perform voltage scaling according to a voltage difference between the first output terminal and the second output terminal of the multiplexer.
In one embodiment, the multiplexer further includes a reference voltage output terminal, a first switch and a first capacitor are connected in parallel to the reference voltage output terminal and the first output terminal, and a second switch and a second capacitor are connected in parallel to the reference voltage output terminal and the second output terminal.
In one embodiment, a third switch and a fourth switch are respectively connected in parallel between the input end and the output end of the voltage scaling module.
In one embodiment, the voltage sampling scaling circuit further comprises:
and the charge sampling module is respectively and electrically connected with the first output end and the second output end of the multiplexer and is electrically connected with the voltage scaling module.
In one embodiment, the voltage scaling module comprises:
the grid electrode of the first MOS tube is connected with a clock signal, the source electrode of the first MOS tube is connected with the first output end, and the drain electrode of the first MOS tube is connected with a third capacitor;
a gate of the second MOS tube is connected with a clock signal, a source of the second MOS tube is connected with a reference voltage output end, and a drain of the second MOS tube is connected with a fourth capacitor;
a gate of the third MOS tube is connected with a clock signal, a source of the third MOS tube is connected with a reference voltage output end, and a drain of the third MOS tube is connected with a third capacitor;
and the grid electrode of the fourth MOS tube is connected with a clock signal, the source electrode of the fourth MOS tube is connected with the second output end, and the drain electrode of the fourth MOS tube is connected with a fourth capacitor.
In one embodiment, the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are PMOS transistors.
The present invention provides a voltage sampling scaling circuit based on a BMS, which comprises: a power module comprising a plurality of power output terminals; the voltage sampling module is electrically connected with the power supply module through the plurality of direct current power supply output ends, and two paths of the voltage sampling module are extracted from the plurality of power supply output ends to be used as output ends of the voltage sampling module; and the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module, and scales the voltage according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset value. The voltage sampling scaling circuit provided by the invention realizes the sampling of multi-path voltage through the voltage sampling module, and realizes the effective scaling of high voltage by using the charge distribution principle through the voltage scaling module.
Drawings
FIG. 1 is a block diagram of the BMS based voltage sample scaling circuit in one embodiment;
fig. 2 is a block diagram of a BMS-based voltage sample scaling circuit in another embodiment;
FIG. 3 is a circuit diagram of a power module in the BMS based voltage sample scaling circuit in one embodiment;
FIG. 4 is a circuit diagram of a voltage sampling module in the BMS based voltage sampling scaling circuit in one embodiment;
FIG. 5 is an overall circuit diagram of the BMS based voltage sample scaling circuit in one embodiment;
fig. 6 is a circuit diagram of a voltage scaling module in the BMS-based voltage sampling scaling circuit in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first switch may be referred to as a second switch, and similarly, a second switch may be referred to as a first switch, without departing from the scope of the present application. The first switch and the second switch are both switches, but they are not the same switch.
In one embodiment, referring to fig. 1, there is provided a BMS-based voltage sampling scaling circuit applied to a Battery Management System (BMS for short) including:
a power module including a plurality of power output terminals;
the voltage sampling module is electrically connected with the power supply module through a plurality of direct current power supply output ends and extracts two paths from the plurality of power supply output ends as output ends of the voltage sampling module;
and the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module and scales the voltage according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset size.
Specifically, a Battery Management System (BMS), which is a Battery Management System, generally has a function of measuring a Battery voltage to prevent or avoid abnormal situations such as overdischarge, overcharge, and over-temperature of the Battery. As technology has evolved, many functions have been gradually added.
Wherein, the power module can include: and the output ends of the battery packs are respectively led out from two ends of each battery in the battery packs and serve as a plurality of power supply output ends of the power supply module. The number of batteries in a battery management system is commonly applied, for example: 1S-30S (S: series; P: parallel): the mobile phone comprises: 1S plate: 1-2S electrification: 2-3S electric hand tool: 3-5S electric mower and other large tools: 10S up electric passenger vehicle: a ternary lithium ion battery is generally adopted, and 80-100S electric motor coaches are as follows: 100-200S up.
And the voltage sampling module is electrically connected with the power supply module through a plurality of direct current power supply output ends and extracts two paths from the plurality of power supply output ends to be used as the output ends of the voltage sampling module. For example, a MUX may be used, and a circuit that can select any one of the MUX paths during the multi-path data transmission process is called a data selector, also called a multiplexer or a multi-path switch. The product specification is divided into a 4-from-1 data selector, an 8-from-1 data selector (model numbers 74151, 74LS151, 74251, 74LS153), a 16-from-1 data selector (which can be formed by connecting two pieces 74151) and the like.
And the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module and scales the voltage according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset size. The voltage scaling is performed by the charge distribution principle, so that the voltage scaling proportion is more accurate, the control is easy, and the cost is reduced.
In this embodiment, the voltage sampling scaling circuit includes: a power module including a plurality of power output terminals; the voltage sampling module is electrically connected with the power supply module through a plurality of direct current power supply output ends and extracts two paths from the plurality of power supply output ends as output ends of the voltage sampling module; and the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module and scales the voltage according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset size. In the embodiment, the voltage sampling module is used for sampling a plurality of paths of voltages, the voltage scaling module is used for scaling the voltages by adopting a charge distribution principle, and the high voltage is effectively scaled.
In one embodiment, referring to fig. 2, there is provided a BMS-based voltage sampling scaling circuit further including:
and the amplifying module comprises a charge sampling amplifier, and the input end of the charge sampling amplifier is electrically connected with the output end of the voltage scaling module.
In the embodiment, the precision control is more accurate and the cost is lower by using the charge sampling amplifier for amplification.
In one embodiment, referring to fig. 3, there is provided a BMS-based voltage sampling scaling circuit in which a power supply module includes:
and the output ends of the battery packs are respectively led out from two ends of each battery in the battery packs and serve as a plurality of power supply output ends of the power supply module.
In the embodiment, 16 batteries B1-B16 are connected in series, and output ends are led out from two ends of each battery to serve as a plurality of power supply output ends of the power supply module. It will be appreciated that in practical applications, the number of batteries may be modified as desired.
In one embodiment, referring to fig. 4, there is provided a BMS-based voltage sampling scaling circuit in which a voltage sampling module includes:
and the input end of the multi-path selector is respectively and electrically connected with the plurality of power output ends of the power module, and the multi-path selector is used for selecting two paths from the plurality of power output ends of the power module to be used as a first output end and a second output end of the multi-path selector.
In this embodiment, the multiplexer MUX is electrically connected to the 16 voltage output terminals in fig. 3. And two of the 16 voltage output terminals are selected as a first output terminal VPOS and a second output terminal VNEG of the multiplexer MUX. Then, the first output end VPOS and the second output end VNEG of the multiplexer MUX are electrically connected to a voltage scaling module, respectively, and the voltage scaling module is configured to perform voltage scaling according to a voltage difference between the first output end VPOS and the second output end VNEG of the multiplexer MUX.
In a specific embodiment, referring to fig. 5, the multiplexer further includes a reference voltage output terminal, the reference voltage output terminal and the first output terminal are connected in parallel to form a first switch and a first capacitor, and the reference voltage output terminal and the second output terminal are connected in parallel to form a second switch and a second capacitor.
Specifically, the multiplexer MUX further includes a reference voltage output terminal VCM, which is connected in parallel to the first output terminal VPOS by a first switch P1 and a first capacitor C1, and is connected in parallel to the second output terminal VNEG by a second switch P2 and a second capacitor C2.
In a specific embodiment, referring to fig. 5, a third switch and a fourth switch are respectively connected in parallel between the input terminal and the output terminal of the voltage scaling module.
Specifically, a third switch P3 and a fourth switch P4 are connected in parallel between the input end and the output end of the voltage scaling module, respectively.
In a specific embodiment, referring to fig. 5, there is provided a BMS-based voltage sampling scaling circuit further including:
and the charge sampling module is electrically connected with the first output end and the second output end of the multiplexer respectively and is electrically connected with the voltage scaling module.
Specifically, the charge sampling module is electrically connected to the first output port VPOS and the second output port VNEG of the multiplexer, and is electrically connected to the voltage scaling module.
In one embodiment, referring to fig. 6, there is provided a BMS-based voltage sampling scaling circuit, the voltage scaling module including:
a gate of the first MOS transistor M1, a gate of the first MOS transistor M1 is connected with a clock signal, a source of the first MOS transistor M1 is connected with the first output end, and a drain of the first MOS transistor M1 is connected with a third capacitor C3;
a gate of the second MOS transistor M2, a gate of the second MOS transistor M2 is connected with a clock signal, a source of the second MOS transistor M2 is connected with the reference voltage output end, and a drain of the second MOS transistor M2 is connected with a fourth capacitor C4;
a gate of the third MOS transistor M3 and the gate of the third MOS transistor M3 are connected with a clock signal, a source of the third MOS transistor M3 is connected with a reference voltage output end, and a drain of the third MOS transistor M3 is connected with a third capacitor C3;
the gate of the fourth MOS transistor M4, the gate of the fourth MOS transistor M4 is connected to a clock signal, the source of the fourth MOS transistor M4 is connected to the second output terminal, and the drain of the fourth MOS transistor M4 is connected to a fourth capacitor C4.
In a specific embodiment, the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor are PMOS transistors.
In this embodiment, a specific circuit diagram structure of the voltage scaling circuit is disclosed, and specifically, in conjunction with fig. 6, the circuit includes: the circuit comprises a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, a fourth MOS transistor M4, a clock signal ck _ dis _ p, a third capacitor C3 and a fourth capacitor C4.
In the embodiment, the on or off of the switch circuit is controlled by the clock circuit, the voltage difference is stored in the capacitor, and the voltage withstanding capability is improved by connecting a plurality of capacitors in series. As can be seen from fig. 6:
VCM-VPOS＝1.1+0.2*(VH-VL)
VCM-VNEG＝1.1-0.2*(VH-VL)
subtracting the above two equations yields:
VNEG-VPOS＝0.4*(VH-VL)
when VNEG-VPOS was designated as Δ VA and VH-VL was designated as Δ V, the following were obtained:
ΔVA＝0.4*ΔV
it can be seen that scaling the voltage difference according to a certain ratio can be realized by only changing the size of the corresponding capacitor.
In the embodiment, the voltage difference is stored in the capacitor by the charge distribution principle to realize the scaling of the voltage difference, the precision of voltage scaling is improved, the scaling proportion is easy to control, and in addition, the voltage scaling circuit based on the charge distribution principle has high voltage resistance and low cost.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A BMS-based voltage sampling scaling circuit, the voltage sampling scaling circuit comprising:
a power module comprising a plurality of power output terminals;
the voltage sampling module is electrically connected with the power supply module through the plurality of power supply output ends and extracts two paths from the plurality of power supply output ends as output ends of the voltage sampling module;
the voltage scaling module is electrically connected with the voltage sampling module through the output end of the voltage sampling module, and performs voltage scaling according to the difference value of the voltage at the output end of the voltage sampling module by adopting a charge distribution principle so as to enable the voltage output by the voltage scaling module to reach a preset value;
the voltage sampling module comprises a multiplexer, the input end of the multiplexer is respectively electrically connected with the power supply output ends of the power supply module, and the multiplexer is used for selecting two paths from the power supply output ends of the power supply module to be used as a first output end and a second output end of the multiplexer;
the first output end and the second output end of the multiplexer are respectively electrically connected with the voltage scaling module, and the voltage scaling module is used for scaling voltage by adopting a charge distribution principle according to the voltage difference value of the first output end and the second output end of the multiplexer;
the multiplexer also comprises a reference voltage output end, a first switch and a first capacitor are connected in parallel with the reference voltage output end and the first output end, and a second switch and a second capacitor are connected in parallel with the reference voltage output end and the second output end;
the voltage scaling module comprises a first MOS tube, a grid electrode of the first MOS tube is connected with a clock signal, a source electrode of the first MOS tube is connected with the first output end, and a drain electrode of the first MOS tube is connected with a third capacitor;
a gate of the second MOS tube is connected with a clock signal, a source of the second MOS tube is connected with a reference voltage output end, and a drain of the second MOS tube is connected with a fourth capacitor;
a gate of the third MOS tube is connected with a clock signal, a source of the third MOS tube is connected with a reference voltage output end, and a drain of the third MOS tube is connected with a third capacitor;
and the grid electrode of the fourth MOS tube is connected with a clock signal, the source electrode of the fourth MOS tube is connected with the second output end, and the drain electrode of the fourth MOS tube is connected with a fourth capacitor.
2. The BMS-based voltage sampling scaling circuit of claim 1, further comprising:
the amplifying module comprises a charge sampling amplifier, and the input end of the charge sampling amplifier is electrically connected with the output end of the voltage scaling module.
3. The BMS-based voltage sampling scaling circuit of claim 1, wherein the power module comprises:
and the output ends of the battery packs are respectively led out from two ends of each battery in the battery packs and serve as a plurality of power supply output ends of the power supply module.
4. The BMS-based voltage sampling scaling circuit of claim 1, wherein a third switch and a fourth switch are connected in parallel between the input and the output of the voltage scaling module, respectively.
5. The BMS-based voltage sampling scaling circuit of claim 4, further comprising:
and the charge sampling module is respectively and electrically connected with the first output end and the second output end of the multiplexer and is electrically connected with the voltage scaling module.
6. The BMS-based voltage sampling scaling circuit according to claim 5, wherein the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor are PMOS transistors.
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| CN101789776B (en) * | 2009-01-23 | 2012-08-22 | 中芯国际集成电路制造(上海)有限公司 | Sampling switching circuit |
| CN201947013U (en) * | 2011-01-14 | 2011-08-24 | 宁波海锂子新能源有限公司 | A power supply manage system for compensating and balancing voltage difference |
| CN102426339A (en) * | 2011-09-03 | 2012-04-25 | 镇江恒驰科技有限公司 | Voltage collecting circuit for monomer batteries of battery pack |
| US20150054574A1 (en) * | 2013-08-23 | 2015-02-26 | International Business Machines Corporation | Digital control system for distributed voltage regulators |
| CN104065141B (en) * | 2014-07-04 | 2017-02-15 | 中煤科工集团重庆研究院有限公司 | large-scale battery management system |
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