CN104898064A - Sampling circuit of flying capacitor and sampling method - Google Patents
Sampling circuit of flying capacitor and sampling method Download PDFInfo
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- CN104898064A CN104898064A CN201510237205.6A CN201510237205A CN104898064A CN 104898064 A CN104898064 A CN 104898064A CN 201510237205 A CN201510237205 A CN 201510237205A CN 104898064 A CN104898064 A CN 104898064A
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Abstract
The present invention provides a sampling circuit of a flying capacitor. The circuit comprises a sampling relay group formed by the order connection of N relays, a battery polarity inversion relay group formed by four relays, a capacitor front relay group formed by two relays, a flying capacitor, a capacitor back relay group formed by two relays, a signal conditioning circuitry, an ADC conversion circuit, a single chip microcomputer and a decoder. The input end of the sampling relay group is connected to a battery module through a current limiting resistor. The decoder is respectively connected to the sampling relay group and the battery polarity inversion relay group. The single chip microcomputer is also connected to capacitor front relays, a control switch and capacitor back relays and controls the on and off of the capacitor front relays, the control switch and the capacitor back relays. The single chip microcomputer controls the on and off of the sampling relay group and the battery polarity inversion relay group through the decoder. The invention also provides a sampling method of the flying capacitor. The sampling circuit of the invention has the advantages of simple structure, high measurement precision and strong anti-interference performance.
Description
Technical field
The present invention relates to a kind of sample circuit and the method for sampling of flying capacitance.
Background technology
Monomer voltage is the most important information of cell-state in characterizing battery group, in charging and discharging process, is controlled by monomer voltage in a rational scope, can ensure that battery is not by super-charge super-discharge, is the important means ensureing electric battery serviceable life.Battery cell voltage sample in current driving force automobile in power brick has the mode of discrete device formula and special integrated chip, the sample mode of special integrated chip has non-isolated, circuit design is simple, the feature that design threshold is low, if which has certain advantage for general low pressure (lower than 72V) environment, if under the environment for cell voltage high (higher than 200V), due to non-isolated, high pressure easily seals in circuit substrate low-pressure system, light then cause circuit burnout, system cannot normally work, heavy then cause battery catches fire, the catastrophic failures such as blast, and the sample mode of discrete device formula, although possess certain buffer action, complex circuit designs, between the operating period, kind is loaded down with trivial details, cost is higher, reliability is low, is unfavorable for that batch uses.
Summary of the invention
The present invention aims to provide that a kind of structure is simple, measuring accuracy is high, the sample circuit of the flying capacitance of strong interference immunity and the method for sampling.
The present invention is realized by following scheme:
A kind of sample circuit of flying capacitance, relay group, signal conditioning circuit, ADC change-over circuit, single-chip microcomputer and code translator after relay group before comprising the sampling relay group be made up of N number of relay, the battery polarity reversal relay group be made up of four relays, the electric capacity that is made up of two relays, flying capacitance, the electric capacity that is made up of two relays, wherein N is greater than 2;
The input end of each relay of sampling relay group is connected to realize being connected with (N-1) individual battery module respectively with a current-limiting resistance, the upper output terminal of sampling relay group is connected two buses respectively with lower output terminal, article four, the other end of bus connects the input end of the relay in a battery polarity reversal relay group respectively, battery polarity reversal relay group forms two output terminals according to the polarity of voltage that its relay receives, namely the polarity of voltage received in battery polarity reversal relay group is that the output terminal of positive relay collects the output terminal forming battery polarity reversal relay group, the polarity of voltage received is that the output terminal of negative relay collects another output terminal forming battery polarity reversal relay group, before electric capacity, the input end of two relays of relay group is connected with two output terminals of battery polarity reversal relay group respectively, before electric capacity, the output terminal of two relays of relay group is all connected to flying capacitance, flying capacitance connects a gauge tap again, gauge tap is connected with the input end of two relays of relay group after electric capacity again, and after electric capacity, the output terminal of two relays of relay group is all connected with the input end of signal conditioning circuit,
The output terminal of signal conditioning circuit and ADC change-over circuit, single-chip microcomputer is connected successively with code translator, code translator respectively with sampling relay group, battery polarity reversal relay group is connected, single-chip microcomputer also respectively with electric capacity before relay group, gauge tap is connected with relay group after electric capacity and can controls its break-make, single-chip microcomputer controls sampling relay group by code translator, the break-make of battery polarity reversal relay group, realize during the voltage sample of tested battery module, only have this tested battery module to be connected with described bus and the collection voltage that obtains of signal conditioning circuit on the occasion of, realize in turn to the sampling of each battery module voltages.
Battery polarity reversal relay group, for ensure described signal conditioning circuit obtain battery module voltages to be collected be always on the occasion of;
Flying capacitance, usual employing good pressure-resistant performance, the thin-film capacitor that thermal effect is good, withstand voltage requires at more than 1.5 times of battery rated voltage and precision is ± 10%, capacitance is between 0.1-1.0uF, flying capacitance keeps for the sampling of voltage signal, receive the voltage signal that sampling relay group exports, after after electric capacity relay group received the voltage signal on flying capacitance by signal conditioning circuit, and the voltage signal received is carried out filtering, amplification;
Gauge tap is for controlling the electric discharge of flying capacitance;
Before electric capacity, relay group is for controlling the charging of flying capacitance, and after electric capacity, relay group is for controlling the voltage sample of flying capacitance.
Under normal circumstances, before described sampling relay group, battery polarity reversal relay group, electric capacity, after relay, electric capacity, PhotoMOS relay all selected by relay.
A method of sampling for flying capacitance, adopts the sample circuit of above-mentioned flying capacitance, carries out according to the following steps:
(1) described single-chip microcomputer controls described sampling relay group by code translator, guarantees at the unique tested battery module of an instance sample relay gating;
(2) according to the polarity of tested battery module, single-chip microcomputer controls battery polarity reversal relay group by code translator, guarantee signal conditioning circuit obtain battery module voltages to be collected on the occasion of;
(3) before electric capacity described in described Single-chip Controlling, relay group closes, and allows the tested battery module of gating to described flying capacitance charging, relay group, sampling relay group and battery polarity reversal relay group before the described electric capacity of stable rear disconnection to be charged;
(4) after electric capacity described in described Single-chip Controlling, relay group closes, the voltage signal on flying capacitance is made to export ADC conversion circuit to after signal conditioning circuit filtering, amplification, in ADC conversion circuit, voltage signal is changed into numeral, adopt least square method to carry out curve fitting and export described single-chip microcomputer to after revising, single-chip microcomputer obtains the sampled voltage of this tested battery module;
(5) relay group after described Single-chip Controlling disconnects electric capacity also controls described gauge tap and closes, until flying capacitance discharge off;
(6) above-mentioned steps (1) ~ (5) are repeated, until the voltage sample of all battery modules completes.
The sample circuit of flying capacitance of the present invention, structure is simple, measuring accuracy is high, and suitably can reduce certain cost, by battery polarity reversal relay group ensure voltage signal that signal conditioning circuit obtains be always on the occasion of, therefore only a road ADC change-over circuit need be adopted can to process the voltage signal exported by signal conditioning circuit, in ADC change-over circuit, voltage signal is changed into numeral, adopt least square method to carry out curve fitting and after revising, export in single-chip microcomputer.In addition, be connected a gauge tap at flying capacitance between relay group with after electric capacity, for controlling the electric discharge of flying capacitance, can discharge as quick as thought, because the velocity of discharge fast time is short, the front and back sampling of flying capacitance can not be interfered, and can better ensure the precision of sampling.Sample circuit of the present invention is adopted to realize the method for flying capacitance voltage sample, step is simple, and in ADC change-over circuit, voltage signal is changed into numeral, least square method is adopted to carry out curve fitting and revise, with traditional calibration compensation method, decrease other objectively inevitable measuring error of bringing of factor such as hardware device tolerance, interference, improve sampling precision.
Accompanying drawing explanation
Fig. 1: the sample circuit structural representation of flying capacitance in embodiment 1
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to the statement of embodiment.
Embodiment 1
A kind of sample circuit of flying capacitance, as shown in Figure 1, relay group, signal conditioning circuit, ADC change-over circuit, single-chip microcomputer and code translator, bus a, bus b, bus c, bus d after relay group before comprising three battery modules, four current-limiting resistances, the sampling relay group be made up of four PhotoMOS relays, the battery polarity reversal relay group be made up of four PhotoMOS relays, the electric capacity that is made up of two PhotoMOS relays, flying capacitance, the electric capacity that is made up of two PhotoMOS relays;
Three battery modules are U1, U2 and U3, four current-limiting resistances are R1, R2, R3 and R4, four PhotoMOS relays of sampling relay group are S1, S2, S3 and S4, the positive and negative terminal of battery module respectively connects a current-limiting resistance and a PhotoMOS relay successively, the upper output terminals A connection bus a of sampling relay group and bus d, the lower output terminal B connection bus b and bus c of sampling relay group, to realize the break-make of time sharing sampling to different battery module;
Four PhotoMOS relays of battery polarity reversal relay group are S5, S6, S7 and S8, the input end of relay S5 and S6 is respectively by bus a, bus b is connected with the output terminal of sampling relay group, relay S5 and S6 is positive pole at the upper output terminals A voltage of sampling relay group, lower output terminal B voltage is communicated with when being negative pole, the input end of relay S7 and S8 is respectively by bus c, bus d is connected with the output terminal of sampling relay group, relay S7 and S8 is negative pole at the upper output terminals A voltage of sampling relay group, lower output terminal B voltage is communicated with when being positive pole, battery polarity reversal relay group for ensure described signal conditioning circuit obtain battery module voltages to be collected be always on the occasion of, battery polarity reversal relay group forms two output terminals according to the polarity of voltage that its relay receives, namely the polarity of voltage received is that the output terminal of positive relay S5 and S7 collects the output terminal D forming battery polarity reversal relay group, and the polarity of voltage of reception is that the output terminal of negative relay S6 and S8 collects another output terminal F forming battery polarity reversal relay group,
Before electric capacity, the input end of two PhotoMOS relay S9 with S10 of relay group is connected with two output terminals D, F of battery polarity reversal relay group respectively, before electric capacity, the output terminal of two PhotoMOS relay S9 and S10 of relay group is all connected to flying capacitance, flying capacitance connects a gauge tap K again, gauge tap K is connected with the input end of two PhotoMOS relay S11 and S12 of relay group after electric capacity again, and after electric capacity, the output terminal of two PhotoMOS relay S11 with S12 of relay group is all connected with the input end of signal conditioning circuit;
The output terminal of signal conditioning circuit and ADC change-over circuit, single-chip microcomputer is connected successively with code translator, code translator respectively with sampling relay group, battery polarity reversal relay group is connected, single-chip microcomputer also respectively with electric capacity before relay group, gauge tap K is connected with relay group after electric capacity and can controls its break-make, single-chip microcomputer controls sampling relay group by code translator, the break-make of battery polarity reversal relay group, realize during the voltage sample of tested battery module, only have this tested battery module to be connected with described bus and the collection voltage that obtains of signal conditioning circuit on the occasion of, realize in turn to the sampling of each battery module voltages.
Flying capacitance, usual employing good pressure-resistant performance, the thin-film capacitor that thermal effect is good, withstand voltage requires at more than 1.5 times of battery rated voltage and precision is ± 10%, capacitance is between 0.1-1.0uF, flying capacitance keeps for the sampling of voltage signal, receive the voltage signal that sampling relay group exports, after after electric capacity relay group received the voltage signal on flying capacitance by signal conditioning circuit, and the voltage signal received is carried out filtering, amplification;
Gauge tap K is for controlling the electric discharge of flying capacitance C; Before electric capacity, relay group is for controlling the charging of flying capacitance C, and after electric capacity, relay group is for controlling the voltage sample of flying capacitance C.
A method of sampling for flying capacitance, adopts the sample circuit of above-mentioned flying capacitance, carries out according to the following steps:
(1) single-chip microcomputer controls sampling relay group by code translator, guarantees at the unique tested battery module of an instance sample relay gating; First carry out voltage sample to tested battery module U1, relay S1, S2 of Single-chip Controlling sampling relay group close simultaneously, and relay S3, S4 disconnect;
(2) according to the polarity of tested battery module U1, relay S5 and S6 that single-chip microcomputer is controlled in battery polarity reversal relay group by code translator closes simultaneously, relay S7 and S8 disconnects, guarantee signal conditioning circuit obtain battery module voltages to be collected on the occasion of;
(3) before Single-chip Controlling electric capacity, relay S9, S10 are closed, the tested battery module U1 of gating is allowed to charge to flying capacitance C, the voltage Vc of flying capacitance increases gradually, elapsed time t1 to be charged make Vc reach stable after, flying capacitance C voltage is now the voltage signal of tested battery module U1, disconnects relay S5, S6 in relay S9, S10 before electric capacity, relay S1, S2 of sampling relay group and battery polarity reversal relay group afterwards;
(4) after Single-chip Controlling electric capacity, relay S11, S12 are closed, the voltage signal on flying capacitance C is made to export ADC conversion circuit to after signal conditioning circuit filtering, amplification, in ADC conversion circuit, voltage signal is changed into numeral, adopt least square method to carry out curve fitting and export single-chip microcomputer to after revising, single-chip microcomputer obtains the sampled voltage of this tested battery module U1, after elapsed time t2, complete the voltage sample of battery module U1;
(5), after, Single-chip Controlling disconnects relay S11, S12 after electric capacity and controls described gauge tap K and closes, after elapsed time t3, and flying capacitance C discharge off;
(6) above-mentioned steps (1) ~ (5) are repeated, voltage sample is carried out to next battery module U2, first single-chip microcomputer controls the relay S2 of sampling relay group by code translator, S3 closes simultaneously, relay S1, S4 disconnects, Single-chip Controlling battery polarity reversal relay S7 afterwards, S8 closes, relay S5, S6 disconnects, then relay S9 before closed electric capacity, S10, after elapsed time t1 flying capacitance C charging is stable, relay S9 before disconnection electric capacity, S10 also closes the follow-up electrical equipment S11 of electric capacity, S12, the voltage sample of battery module U2 is completed after elapsed time t2, now relay S11 after disconnection electric capacity, S12 Closed control K switch, after elapsed time t3, flying capacitance C discharge off.Circulation like this, until the voltage sample of all battery modules completes.
Embodiment 2
A sample circuit for flying capacitance, its circuit structure is similar with the sample circuit of the flying capacitance of embodiment 1, and its difference is: battery module quantity is six, and the relay quantity of sampling relay group is seven.
Claims (3)
1. the sample circuit of a flying capacitance, it is characterized in that: relay group, signal conditioning circuit, ADC change-over circuit, single-chip microcomputer and code translator after relay group before comprising the sampling relay group be made up of N number of relay, the battery polarity reversal relay group be made up of four relays, the electric capacity that is made up of two relays, flying capacitance, the electric capacity that is made up of two relays, wherein N is greater than 2;
The input end of each relay of sampling relay group is connected to realize being connected with (N-1) individual battery module respectively with a current-limiting resistance, the upper output terminal of sampling relay group is connected two buses respectively with lower output terminal, article four, the other end of bus connects the input end of the relay in a battery polarity reversal relay group respectively, battery polarity reversal relay group forms two output terminals according to the polarity of voltage that its relay receives, before electric capacity, the input end of two relays of relay group is connected with two output terminals of battery polarity reversal relay group respectively, before electric capacity, the output terminal of two relays of relay group is all connected to flying capacitance, flying capacitance connects a gauge tap again, gauge tap is connected with the input end of two relays of relay group after electric capacity again, after electric capacity, the output terminal of two relays of relay group is all connected with the input end of signal conditioning circuit,
The output terminal of signal conditioning circuit is connected with code translator successively with ADC change-over circuit, single-chip microcomputer, code translator is connected with sampling relay group, battery polarity reversal relay group respectively, single-chip microcomputer is also connected with relay group after relay group, gauge tap and electric capacity before electric capacity respectively and can controls its break-make, and single-chip microcomputer controls the break-make of sampling relay group, battery polarity reversal relay group by code translator.
2. the sample circuit of a kind of flying capacitance as claimed in claim 1, is characterized in that: before described sampling relay group, battery polarity reversal relay group, electric capacity, after relay group, electric capacity, relay group all selects PhotoMOS relay.
3. a method of sampling for flying capacitance, is characterized in that: the sample circuit adopting flying capacitance as claimed in claim 1 or 2, carries out according to the following steps:
(1) described single-chip microcomputer controls described sampling relay group by code translator, guarantees at the unique tested battery module of an instance sample relay gating;
(2) according to the polarity of tested battery module, single-chip microcomputer controls battery polarity reversal relay group by code translator, guarantee signal conditioning circuit obtain battery module voltages to be collected on the occasion of;
(3) before electric capacity described in described Single-chip Controlling, relay group closes, and allows the tested battery module of gating to described flying capacitance charging, relay group, sampling relay group and battery polarity reversal relay group before the described electric capacity of stable rear disconnection to be charged;
(4) after electric capacity described in described Single-chip Controlling, relay group closes, the voltage signal on flying capacitance is made to export ADC conversion circuit to after signal conditioning circuit filtering, amplification, in ADC conversion circuit, voltage signal is changed into numeral, adopt least square method to carry out curve fitting and export described single-chip microcomputer to after revising, single-chip microcomputer obtains the sampled voltage of this tested battery module;
(5) relay group after described Single-chip Controlling disconnects electric capacity also controls described gauge tap and closes, until flying capacitance discharge off;
(6) above-mentioned steps (1) ~ (5) are repeated, until the voltage sample of all battery modules completes.
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| CN201510237205.6A CN104898064A (en) | 2015-05-12 | 2015-05-12 | Sampling circuit of flying capacitor and sampling method |
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| CN201510237205.6A CN104898064A (en) | 2015-05-12 | 2015-05-12 | Sampling circuit of flying capacitor and sampling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020030117A (en) * | 2018-08-23 | 2020-02-27 | 矢崎総業株式会社 | Ground fault detection device |
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| US20080084217A1 (en) * | 2006-10-06 | 2008-04-10 | Enerdel, Inc. | System and method to measure series-connected cell voltages using a flying capacitor |
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Address after: 528031, room 1, building 131, No. 601-604, Hua Hua Xi Road, Chancheng District, Guangdong, Foshan, China, A Applicant after: Ke Liyuan Technology of Hybrid Electric Vehicle Co., Ltd Address before: 410205 No. 348 west slope, Changsha hi tech Development Zone, Hunan, 101, 102, Tongzi Applicant before: Ke Liyuan Technology of Hybrid Electric Vehicle Co., Ltd |
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