CN113306450A - Series formation constant-voltage charging circuit - Google Patents
Series formation constant-voltage charging circuit Download PDFInfo
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- CN113306450A CN113306450A CN202110716037.4A CN202110716037A CN113306450A CN 113306450 A CN113306450 A CN 113306450A CN 202110716037 A CN202110716037 A CN 202110716037A CN 113306450 A CN113306450 A CN 113306450A
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- Prior art keywords
- bypass
- mos
- series
- main circuit
- circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a series formation constant voltage charging circuit, which is used for charging a power battery pack, wherein the power battery pack is provided with a plurality of single batteries and comprises: a power module; a plurality of charging units connected in series with the positive and negative poles of the power module, each charging unit having a main circuit MOS and a bypass MOS connected in parallel with the main circuit MOS; each main circuit MOS is provided with two main circuit diodes, and the two main circuit diodes are connected with the series connection into a constant voltage charging circuit in a forward bias mode; each bypass MOS is provided with two bypass diodes, and the two bypass diodes are connected in a reverse bias way and connected in series into a constant voltage charging circuit; and the PWA drive controls a main circuit diode and a bypass diode to be connected with or disconnected from the series connection to form the constant-voltage charging circuit.
Description
Technical Field
The invention relates to the field of electric automobile charging systems, in particular to a series-connection constant-voltage charging circuit.
Background
With the development of low-carbon and environment-friendly economy and new energy strategy and the increasing maturity of electric automobile technology in China, the popularization and application of electric automobiles are increased in various big cities at present, and how to enable the electric automobiles to be charged conveniently and quickly becomes a decisive important link for the popularization and application of the electric automobiles.
The mainstream charging method in the current charging pile market is constant current constant voltage charging (CC-CV), that is, in stage 1, a large current is used for constant current charging, the battery voltage rapidly rises, when the battery voltage reaches a cut-off voltage, stage 2 is switched to perform constant voltage charging, and the charging process is finished after the charging current gradually attenuates to a preset cut-off current. The stage 1 is a main process of the whole charging stage, the ratio of the charged amount of charge exceeds 85%, however, due to the limited capacity of the single batteries, under the condition that the energy density of the batteries is not greatly broken through, almost all the existing electric vehicles adopt a battery pack or battery pack form, namely, a plurality of single batteries are connected in series to form a whole to supply power to the electric vehicle, so as to improve the endurance mileage of the electric vehicle. Then, if the above constant-current constant-voltage charging method is adopted, the whole battery pack is subjected to the constant-current charging in the stage 1 and the constant-voltage charging in the stage 2, because the state and performance attenuation of each single battery in the battery pack in the actual use process are different, the electric quantity of each single battery in the stage 1 exceeds 85%, the electric quantity of each single battery in the stage 1 is less than 85%, and the time for the current of each single battery in the stage 2 to reach the preset value is also different, so that the maximum charging performance of the battery pack cannot be achieved by adopting the above whole constant-current constant-voltage charging method, and the service life of the battery pack is greatly shortened.
Based on the reasons, people develop a rapid and stable constant voltage charging system, each single battery in the battery pack is controlled to be connected or disconnected with the constant current charging module and the constant voltage charging module by arranging the voltage detection module and the current detection module according to the detected voltage or current state of the single battery in the battery pack, and the constant current circuit or the constant voltage circuit is connected or disconnected when each single battery can reach the self optimal state, so that the charging efficiency of the whole battery pack formed by connecting the single batteries in series is ensured to be highest; further, the working voltage value of the constant voltage charging module is the voltage of the single battery reaching the constant voltage point at first, so that the voltage selection during constant voltage charging is optimal, and the stable balance of the constant voltage charging of the whole battery pack is ensured. Therefore, a charging circuit for ensuring each single battery to reach a constant voltage state in a constant current or voltage system is very important.
Therefore, it is necessary to design a fast and stable series-connected constant voltage charging circuit suitable for a battery pack.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to realize the purpose of constant voltage of the single battery in each charging unit by independently controlling the closing and the conducting of a main circuit MOS and a bypass MOS through PWM driving.
The invention is realized by adopting the following technical scheme: a tandem formation constant voltage charging circuit for charging a power battery pack having a plurality of cells, comprising: a power module; a plurality of charging units connected in series with the positive and negative poles of the power module, each charging unit having a main circuit MOS and a bypass MOS connected in parallel with the main circuit MOS; each main circuit MOS is provided with two main circuit diodes, and the two main circuit diodes are connected with the series connection into a constant voltage charging circuit in a forward bias mode; each bypass MOS is provided with two bypass diodes, and the two bypass diodes are connected in a reverse bias way and connected in series into a constant voltage charging circuit; the PWA drive controls a main circuit diode and a bypass diode to be connected or disconnected with the series connection to form a constant voltage charging circuit; when the series-connection constant-voltage charging circuit works, each single battery is connected with a corresponding charging unit, each main circuit MOS is connected with the positive electrode of the single battery and the positive electrode of the power module, and when the series-connection constant-voltage charging circuit is charged, the PWA drives and controls all the main circuit MOS to be switched on, the bypass MOS to be switched off, and the single batteries are charged in series; when the voltage of the power battery reaches a set value, the PWA drives and controls the main circuit MOS and the bypass MOS to be conducted alternately, and the voltage of the single battery in each charging unit is constant.
Furthermore, the series connection formed constant voltage charging circuit further comprises an inductor connected with the anode of the power module.
Furthermore, the two main-circuit diodes are respectively a main-circuit voltage-stabilizing diode and a main-circuit variable capacitance diode which are connected in parallel, the two bypass diodes are respectively a bypass voltage-stabilizing diode and a bypass variable capacitance diode which are connected in parallel, and the PWA drive controls the disconnection and the conduction of the main-circuit variable capacitance diode and the bypass variable capacitance diode.
Further, the PWA drive includes a PWMA drive and a PWMB drive, the PWMA drive controls the main varactor, the PWMB drive controls the bypass varactor, the PWMB drive adjusts duty ratio according to battery voltage current magnitude, the PWMB drive control logic is opposite to the PWMB drive control logic, and the main MOS and the bypass MOS are prevented from being in mutual pass-through.
Further, the PWM driving in each charging unit acts independently according to the voltage condition of the single battery in the charging unit.
Compared with the prior art, the invention has the beneficial effects that:
when the series-connection constant-voltage charging circuit works, each single battery is connected with a corresponding charging unit, each main circuit MOS is connected with the positive electrode of the single battery and the positive electrode of the power module, and when the series-connection constant-voltage charging circuit is charged, the PWA drives and controls all the main circuit MOS to be switched on, the bypass MOS to be switched off, and the single batteries are charged in series; when the voltage of the power battery reaches a set value, the PWA drives and controls the main circuit MOS and the bypass MOS to be conducted alternately, and the voltage of the single battery in each charging unit is constant.
Drawings
FIG. 1 is a schematic circuit diagram of a series-connected constant-voltage charging circuit according to the present invention;
fig. 2 is a schematic diagram showing logic comparison of control pulses of the PWMA drive and the PWMB drive according to the present invention.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 1, the present invention is a schematic circuit diagram of a series-connected constant voltage charging circuit, the series-connected constant voltage charging circuit includes a power module and a plurality of charging units connected in series with the power module, each charging unit is connected in parallel with a main MOS and a bypass MOS, and an inductor connecting the positive electrode of the power module and the charging unit, the inductor can suppress voltage spikes of the whole circuit system when the main MOS and the bypass MOS are switched, and maintain the voltage stability of the series-connected constant voltage charging circuit. In this embodiment, the power module may try AC direct current or DC alternating current, which increases the application range of the series connection formed constant voltage charging circuit; in other embodiments, the alternating current and the direct current of the power module may be selected according to a specific use scenario and a trial object, which is not limited herein.
Specifically, each charging unit is provided with a main circuit MOS and a bypass MOS connected with the main circuit MOS in parallel; each main circuit MOS is provided with two main circuit diodes, and the two main circuit diodes are connected with the series connection into a constant voltage charging circuit in a forward bias mode; each bypass MOS is provided with two bypass diodes, and the two bypass diodes are connected in a reverse bias way and connected in series into a constant voltage charging circuit; the PWA drive controls a main circuit diode and a bypass diode to be connected or disconnected with the series connection to form a constant voltage charging circuit; when the series-connection constant-voltage charging circuit works, each single battery is connected with a corresponding charging unit, each main circuit MOS is connected with the positive electrode of the single battery and the positive electrode of the power module, and when the series-connection constant-voltage charging circuit is charged, the PWA drives and controls all the main circuit MOS to be switched on, the bypass MOS to be switched off, and the single batteries are charged in series; when the voltage of the power battery reaches a set value, the PWA drives and controls the main circuit MOS and the bypass MOS to be conducted alternately, and the voltage of the single battery in each charging unit is constant. In addition, the PWM driving in each charging unit independently acts according to the voltage condition of the single battery in the charging unit, and the voltage of the single battery in each charging unit can be ensured to reach the optimal charging state.
Furthermore, the two main-circuit diodes are respectively a main-circuit voltage-stabilizing diode and a main-circuit variable capacitance diode which are connected in parallel, the two bypass diodes are respectively a bypass voltage-stabilizing diode and a bypass variable capacitance diode which are connected in parallel, and the PWA drive controls the disconnection and the conduction of the main-circuit variable capacitance diode and the bypass variable capacitance diode.
As shown in fig. 1 and 2, the PWA drive includes a PWMA drive that controls the main-side varactor and a PWMB drive that controls the bypass varactor. The PWMB drive adjusts the duty ratio according to the voltage and current of the battery, and the PWMB drive control logic is opposite to the PWMB drive control logic, so that the main circuit MOS and the bypass MOS are prevented from being mutually communicated in a dead time. The detailed description is that the current is multiplied by the time and then multiplied by the duty ratio to be the battery charging capacity, the duty ratio is set according to the capacity and the battery voltage, when the current for maintaining the voltage to be constant is large, the duty ratio is large, otherwise, the duty ratio is small.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (5)
1. The utility model provides a serialization becomes constant voltage charging circuit for power battery group charges, power battery group has a plurality of battery cells, its characterized in that includes:
a power module;
a plurality of charging units connected in series with the positive and negative poles of the power module, each charging unit having a main circuit MOS and a bypass MOS connected in parallel with the main circuit MOS; each main circuit MOS is provided with two main circuit diodes, and the two main circuit diodes are connected with the series connection into a constant voltage charging circuit in a forward bias mode; each bypass MOS is provided with two bypass diodes, and the two bypass diodes are connected in a reverse bias way and connected in series into a constant voltage charging circuit;
the PWA drive controls a main circuit diode and a bypass diode to be connected or disconnected with the series connection to form a constant voltage charging circuit;
when the series-connection constant-voltage charging circuit works, each single battery is connected with a corresponding charging unit, each main circuit MOS is connected with the positive electrode of the single battery and the positive electrode of the power module, and when the series-connection constant-voltage charging circuit is charged, the PWA drives and controls all the main circuit MOS to be switched on, the bypass MOS to be switched off, and the single batteries are charged in series; when the voltage of the power battery reaches a set value, the PWA drives and controls the main circuit MOS and the bypass MOS to be conducted alternately, and the voltage of the single battery in each charging unit is constant.
2. The series formation constant voltage charging circuit according to claim 1, further comprising an inductor connected to the positive electrode of the power supply module.
3. The tandem formation constant voltage charging circuit according to claim 1, wherein the two main path diodes are respectively a main path zener diode and a main path varactor connected in parallel with each other, the two bypass diodes are respectively a bypass zener diode and a bypass varactor connected in parallel with each other, and the PWA drive controls the disconnection and conduction of the main path varactor and the bypass varactor.
4. The tandem formation constant voltage charging circuit according to claim 3, wherein the PWA drive includes a PWMA drive and a PWMB drive, the PWMA drive controls the main circuit varactor, the PWMB drive controls the bypass varactor, the PWMB drive adjusts a duty ratio according to a battery voltage current magnitude, the PWMB drive control logic is opposite to the PWMB drive control logic, and prevents the main circuit MOS and the bypass MOS from being turned through to each other.
5. The tandem formation constant voltage charging circuit according to claim 4, wherein the PWM driving in each charging unit acts independently according to the voltage condition of the unit cells in the charging unit.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110716037.4A CN113306450A (en) | 2021-06-25 | 2021-06-25 | Series formation constant-voltage charging circuit |
| CN202121981042.XU CN216659649U (en) | 2021-06-25 | 2021-08-20 | Formation and capacitance circuit, equipment and system |
| CN202110964897.XA CN113682199A (en) | 2021-06-25 | 2021-08-20 | Formation and capacitance circuit, equipment and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110716037.4A CN113306450A (en) | 2021-06-25 | 2021-06-25 | Series formation constant-voltage charging circuit |
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| Publication Number | Publication Date |
|---|---|
| CN113306450A true CN113306450A (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110716037.4A Pending CN113306450A (en) | 2021-06-25 | 2021-06-25 | Series formation constant-voltage charging circuit |
| CN202110964897.XA Pending CN113682199A (en) | 2021-06-25 | 2021-08-20 | Formation and capacitance circuit, equipment and system |
| CN202121981042.XU Active CN216659649U (en) | 2021-06-25 | 2021-08-20 | Formation and capacitance circuit, equipment and system |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110964897.XA Pending CN113682199A (en) | 2021-06-25 | 2021-08-20 | Formation and capacitance circuit, equipment and system |
| CN202121981042.XU Active CN216659649U (en) | 2021-06-25 | 2021-08-20 | Formation and capacitance circuit, equipment and system |
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| Country | Link |
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| CN (3) | CN113306450A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113799654A (en) * | 2021-09-17 | 2021-12-17 | 国网天津市电力公司 | Power battery equalizing charging method of electric automobile |
| WO2023045269A1 (en) * | 2021-09-26 | 2023-03-30 | 西安快舟机电科技有限公司 | Series formation and capacity grading circuit capable of realizing constant-voltage charging |
-
2021
- 2021-06-25 CN CN202110716037.4A patent/CN113306450A/en active Pending
- 2021-08-20 CN CN202110964897.XA patent/CN113682199A/en active Pending
- 2021-08-20 CN CN202121981042.XU patent/CN216659649U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113799654A (en) * | 2021-09-17 | 2021-12-17 | 国网天津市电力公司 | Power battery equalizing charging method of electric automobile |
| CN113799654B (en) * | 2021-09-17 | 2024-01-12 | 国网天津市电力公司 | Balanced charging method for power battery of electric automobile |
| WO2023045269A1 (en) * | 2021-09-26 | 2023-03-30 | 西安快舟机电科技有限公司 | Series formation and capacity grading circuit capable of realizing constant-voltage charging |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113682199A (en) | 2021-11-23 |
| CN216659649U (en) | 2022-06-03 |
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Application publication date: 20210827 |
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