CN117498510B - Constant voltage charging circuit of electric vehicle battery - Google Patents
Constant voltage charging circuit of electric vehicle battery Download PDFInfo
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- CN117498510B CN117498510B CN202410004957.7A CN202410004957A CN117498510B CN 117498510 B CN117498510 B CN 117498510B CN 202410004957 A CN202410004957 A CN 202410004957A CN 117498510 B CN117498510 B CN 117498510B
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- 238000010280 constant potential charging Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 59
- 238000004804 winding Methods 0.000 claims abstract description 48
- 230000002159 abnormal effect Effects 0.000 claims description 18
- 230000005856 abnormality Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 3
- 238000007600 charging Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101100464779 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CNA1 gene Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Classifications
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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 belongs to the technical field of battery charging, and relates to a constant voltage charging circuit of an electric vehicle battery, which charges the electric vehicle battery by utilizing a switching power supply to output constant voltage, and supplies power to a primary side control circuit of the switching power supply by arranging an auxiliary winding power supply circuit and an input capacitor power supply circuit.
Description
Technical Field
The invention belongs to the technical field of battery charging, and particularly relates to a constant voltage charging circuit of an electric vehicle battery.
Background
The electric vehicle is the most common traffic tool on the current road, and brings great convenience for people to travel. The electric vehicle uses a battery as a main power source, and the battery stores energy and converts the energy into power through a motor to drive the vehicle to run, so that the electric vehicle is very important for the charge control of the battery. The charging process of the battery is generally divided into three stages of constant current, constant voltage and trickle, wherein the constant voltage charging stage can protect the battery from voltage fluctuation, delay the service life of the battery and play a vital role in the charging process of the battery. Referring to fig. 1, the conventional constant voltage charging circuit for the battery of the electric vehicle comprises a switching power supply, an output voltage feedback circuit and a primary side control circuit U0 of the switching power supply, wherein the output voltage feedback circuit samples an output voltage vo+ and compares the output voltage vo+ with a reference voltage Vref, then an optocoupler OC is utilized to feed back a comparison signal as a feedback signal to a FB pin of the primary side control circuit U0 of the switching power supply, the primary side control circuit U0 of the switching power supply generates a control signal according to the feedback signal, the duty ratio of a primary side switch S1 of the switching power supply is changed to realize constant voltage output, namely, the output voltage vo+ is relatively stable through closed loop control of the switching power supply. However, as can be seen from fig. 1, the power supply terminal VCC of the primary side control circuit U0 is powered by the auxiliary winding N3, and when the output voltage vo+ of the switching power supply is low, the voltage provided by the auxiliary winding N3 is low, which may not meet the power supply requirement of the primary side control circuit U0, so that the primary side control circuit U0 cannot work normally, thereby affecting the constant voltage output of the switching power supply; in addition, the abnormal dip of the input voltage, degradation of the switching tube, short circuit and other faults may cause abnormal power supply of the primary side control circuit U0, so that the primary side control circuit U0 cannot start to work, and the output of the switching power supply and the use of the load are affected.
Disclosure of Invention
The invention aims to provide a constant voltage charging circuit of an electric vehicle battery, which solves the problem that a primary side control circuit of a switching power supply of the constant voltage charging circuit of the electric vehicle battery cannot work normally in the prior art, adopts an auxiliary winding power supply circuit and an input capacitor power supply circuit to supply power to the primary side control circuit of the switching power supply, utilizes the auxiliary winding power supply circuit to supply power to the primary side control circuit when the auxiliary winding power supply circuit supplies power normally, and utilizes the input capacitor power supply circuit to supply power to the primary side control circuit when the auxiliary winding power supply circuit supplies power abnormally, thereby ensuring the normal work of the primary side control circuit, so that the constant voltage charging circuit of the electric vehicle battery can stably output constant voltage, and improving the charging reliability and safety of the battery.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a constant voltage charging circuit of electric motor car battery utilizes switching power supply output constant voltage to charge electric motor car battery, switching power supply includes primary control circuit, primary control circuit is used for controlling switching power supply's primary switch, its characterized in that: an auxiliary winding power supply circuit and an input capacitor power supply circuit are arranged, when the auxiliary winding power supply circuit supplies power normally, the auxiliary winding power supply circuit is used for supplying power to the primary side control circuit, and when the auxiliary winding power supply circuit supplies power abnormally, the input capacitor power supply circuit is used for supplying power to the primary side control circuit.
Further, the input capacitor power supply circuit specifically comprises an input capacitor of the switching power supply, a DC-DC circuit and an input capacitor control switch, wherein the input capacitor is connected with the positive end and the negative end of the input side of the switching power supply, one end of the input capacitor control switch is connected with the positive end of the input side of the switching power supply, the other end of the input capacitor control switch is connected with one end of the DC-DC circuit, and the other end of the DC-DC circuit is used as a power supply end to be connected with a power pin of the primary side control circuit.
Further, a first control circuit is used for controlling on-off of the input capacitance control switch, the first control circuit comprises a feedback voltage input end, a threshold voltage input end, a short circuit signal input end, an over-temperature signal input end, a power supply abnormal signal input end and a driving signal output end, and the control end of the input capacitance control switch is connected with the driving signal output end through a driving circuit. The output voltage of the switching power supply is subjected to partial pressure sampling, and then the feedback voltage is input into the feedback voltage input end; inputting a threshold voltage to the threshold voltage input terminal; inputting a primary switch short-circuit signal to the short-circuit signal input end; inputting an overtemperature signal of a primary switch to the overtemperature signal input end; a power supply abnormality signal reflecting an abnormality of an input voltage of the switching power supply is input to the power supply abnormality signal input terminal.
The first control circuit specifically comprises a first comparator, a first OR gate, a first exclusive-OR gate, a first AND gate, a second AND gate and a third AND gate, wherein the positive input end of the first comparator is connected with the feedback voltage input end, the negative input end of the first comparator is connected with the threshold voltage input end, the output end of the first comparator is connected with one input end of the first OR gate, the other input end of the first OR gate is connected with the short-circuit signal input end, one input end of the first exclusive-OR gate is connected with the output end of the first comparator, the other input end of the first exclusive-OR gate is connected with the output end of the first OR gate, the other input end of the first AND gate is connected with the over-temperature signal input end, the other input end of the first AND gate is connected with the power supply abnormal signal input end, the other input end of the second AND gate is connected with the output end of the first OR gate, the other input end of the second AND gate is connected with the output end of the third AND gate, the other input end of the first AND gate is connected with the output end of the third AND gate, and the third AND gate is connected with the output end of the first AND gate.
Further, the DC-DC circuit is a buck-Boost circuit, the input capacitor is an electrolytic capacitor, the driving circuit is a totem pole driving circuit, and the primary side switch and the input capacitor control switch of the switching power supply adopt MOS tubes or IGBT.
Further, the auxiliary winding power supply circuit specifically comprises a transformer auxiliary winding of an open source power supply, a third diode and a fifth capacitor, wherein an anode of the third diode is connected with one end of the transformer auxiliary winding, a cathode of the third diode is connected with one end of the fifth capacitor, the other end of the transformer auxiliary winding is connected with the other end of the fifth capacitor and is grounded, and a cathode of the third diode is used as a power supply end to be connected with a power pin of the primary side control circuit.
The invention has the beneficial effects that:
the constant voltage charging circuit of the electric vehicle battery is characterized in that the auxiliary winding power supply circuit and the input capacitor power supply circuit are arranged, the auxiliary winding power supply circuit is used for supplying power to the primary side control circuit of the switch power supply when the auxiliary winding power supply circuit is normal, the input capacitor power supply circuit is used for supplying power to the primary side control circuit of the switch power supply when the auxiliary winding power supply circuit is abnormal, and meanwhile abnormal conditions such as short circuit and overheating of the primary side switch of the switch power supply and abnormal input voltage of the switch power supply are considered, so that the normal work of the primary side control circuit is ensured, the constant voltage charging circuit of the electric vehicle battery can stably output constant voltage, and the charging reliability and safety of the battery are improved.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings. Specific embodiments of the present invention are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a block diagram of a conventional constant voltage charging circuit for an electric vehicle battery;
fig. 2 is a block diagram of a constant voltage charging circuit of an electric vehicle battery according to the present invention;
fig. 3 is a diagram showing a first control circuit structure of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
With reference to fig. 2, the present invention adopts the following technical scheme: a constant voltage charging circuit of an electric vehicle battery utilizes a switching power supply to output constant voltage to charge the electric vehicle battery, the switching power supply comprises a primary control circuit U2, a transformer formed by a primary winding N1, a secondary winding N2 and an auxiliary winding N3, a primary switch S1 and the like, the primary control circuit U2 is used for controlling the primary switch S1 of the switching power supply, the duty ratio of the primary switch S1 is controlled according to the feedback result of a comparator CMP1 so as to change the output voltage vo+ of the switching power supply, so that constant voltage output is used for charging the electric vehicle battery, the primary control circuit U2 adopts the auxiliary winding power supply circuit and the input capacitor power supply circuit to supply power, the auxiliary winding power supply circuit is used for supplying power to the primary control circuit U2 when the auxiliary winding power supply circuit supplies power normally, and the input capacitor power supply circuit is used for supplying power to the primary control circuit U2 when the auxiliary winding power supply circuit is abnormal.
The input capacitor power supply circuit specifically comprises an input capacitor C1 of a switching power supply, a DC-DC circuit and an input capacitor control switch S2, wherein the input capacitor C1 is connected with positive and negative ends DC+ and DC-of the input side of the switching power supply, one end of the input capacitor control switch S2 is connected with the positive end DC+ of the input side of the switching power supply, the other end of the input capacitor control switch S2 is connected with one end of the DC-DC circuit, and the other end of the DC-DC circuit is used as a power supply end to be connected with a power pin VCC of a primary side control circuit U2. The DC-DC circuit is a buck-Boost circuit, and is configured to step-up and step-down convert the voltage on the input capacitor C1, so that it can provide a supply voltage of, for example, 12V or 24V for the primary side control circuit U2. The input capacitor C1 adopts a high-capacity electrolytic capacitor for filtering and energy storage.
With continued reference to fig. 2, the first control circuit U1 is used to perform on-off control on the input capacitor control switch S2, so as to meet the power requirement of the primary control circuit U2 when the auxiliary winding is abnormal in power supply, where the first control circuit U1 includes a feedback voltage input end Vfb, a threshold voltage input end Vth, a short circuit signal input end incc, an over-temperature signal input end INt, a power abnormal signal input end INi and a driving signal output end OUT, and the control end of the input capacitor control switch S2 is connected with the driving signal output end OUT through a driving circuit. The feedback voltage input end Vfb is configured to receive a sampling voltage of the output end of the switching power supply, the threshold voltage input end Vth receives a threshold voltage, the short circuit signal input end incc is configured to receive a short circuit signal reflecting a short circuit of the primary side switch S1, the over temperature signal input end INt is configured to receive an over temperature signal reflecting a temperature abnormality of the primary side switch S1, the power abnormality signal input end INi is configured to receive a power abnormality signal reflecting an input voltage dc+ and DC-abnormality of the switching power supply, wherein the voltage of the output end of the switching power supply can be sampled through a conventional voltage dividing resistor, the short circuit signal of the primary side switch S1 can be generated by detecting a current flowing through a current detecting resistor RCS in fig. 2, the temperature of the primary side switch S1 is sampled through a temperature sensor or a thermistor and is compared with a reference voltage after the sampling through the voltage dividing resistor, and it is required to be explained that the power abnormality signal mainly detects a drop or interruption of the input voltage of the switching power supply, that the input voltage of the switching power supply is detected to be even zero. The driving circuit is a totem pole driving circuit, and the driving circuit amplifies the driving signal output by the driving signal output end OUT of the first control circuit U1 and then drives the input capacitor to control the on-off of the switch S2.
Referring to fig. 2, the auxiliary winding power supply circuit specifically includes a transformer auxiliary winding N3 of an open source power supply, a third diode D3, and a fifth capacitor C5, where an anode of the third diode D3 is connected to one end of the transformer auxiliary winding N3, a cathode of the third diode D3 is connected to one end of the fifth capacitor C5, another end of the transformer auxiliary winding N3 is connected to another end of the fifth capacitor C5, and all the other ends of the transformer auxiliary winding N3 and the fifth capacitor C5 are grounded, and a cathode D3 of the third diode is connected to a power supply pin VCC of the primary control circuit U2 as a power supply end, and when the switching power supply has an output voltage, a voltage is induced on the transformer auxiliary winding N3, and charges the fifth capacitor C5 through the third diode D3, where the voltage on the fifth capacitor C5 can be used as a power supply voltage to supply the primary control circuit U2.
The primary side switch S1 and the input capacitance control switch S2 of the switching power supply can adopt MOS tubes or IGBT.
Referring to fig. 3, the first control circuit U1 specifically includes a first comparator COMP1, a first or gate 31, a first exclusive-or gate 33, a first and gate 32, a second and gate 34, and a third and gate 35, where a positive input terminal of the first comparator COMP1 is connected to the feedback voltage input terminal, a negative input terminal of the first comparator COMP1 is connected to the threshold voltage input terminal, and an output terminal of the first comparator is connected to one input terminal of the first or gate 31, and the first comparator is configured to determine whether the output voltage of the switching power supply is reduced to a level less than a threshold value, so that when the output voltage of the switching power supply is low, the logic circuit controls the input capacitor to control the switch S2, so that the primary side control circuit U2 is powered by using the voltage on the input capacitor; the other input end of the first or gate 31 is connected to the short-circuit signal input end, one input end of the first exclusive-or gate 33 is connected to the output end of the first comparator COMP1, the other input end of the first exclusive-or gate 33 is connected to the output end of the first or gate 31, one input end of the first or gate 32 is connected to the over-temperature signal input end, the other input end of the first or gate 32 is connected to the power supply abnormal signal input end, one input end of the second or gate 34 is connected to the output end of the first or gate 31, the other input end of the second or gate 34 is connected to the short-circuit signal input end, the first input end of the third or gate 35 is connected to the output end of the first exclusive-or gate 33, the second input end of the third or gate 35 is connected to the output end of the second or gate, the third input end of the third or gate 35 is connected to the output end of the first or gate 32, and the output end of the third or gate 35 is used as the driving signal. When the output voltage of the switching power supply is reduced, the voltage generated by the auxiliary winding N3 cannot meet the power supply requirement of the primary side control circuit U2, so that the primary side control circuit U2 cannot be started, and therefore the input capacitor power supply circuit needs to be controlled to start, however, if the primary side switch S1 is in a short circuit, and abnormal conditions such as over-temperature caused by degradation of the primary side switch tube S1 occur, even if the primary side control circuit U2 can be normally started, constant voltage output of the switching power supply cannot be realized; if the input voltage of the switching power supply is abnormal, the secondary winding N2 can maintain a relatively constant voltage output for a short time due to the capacitor C2, and the primary control circuit U2 can be normally started by the auxiliary winding power supply circuit or the input capacitor power supply circuit.
According to the invention, the auxiliary winding power supply circuit and the input capacitor power supply circuit are arranged, when the auxiliary winding power supply circuit is normal, the auxiliary winding power supply circuit is used for supplying power to the primary side control circuit of the switching power supply, and when the auxiliary winding power supply circuit is abnormal, the input capacitor power supply circuit is used for supplying power to the primary side control circuit of the switching power supply, and meanwhile, the abnormal conditions of short circuit, overheat of the primary side switch of the switching power supply, abnormal input voltage of the switching power supply and the like are considered, so that the normal operation of the primary side control circuit is ensured, and therefore, the constant voltage charging circuit of the electric vehicle battery can stably output constant voltage, and the charging reliability and safety of the battery are improved.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention in any way; those skilled in the art will readily appreciate that the present invention may be implemented as shown in the drawings and described above; however, those skilled in the art will appreciate that many modifications, adaptations, and variations of the present invention are possible in light of the above teachings without departing from the scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the present invention.
Claims (7)
1. The utility model provides a constant voltage charging circuit of electric motor car battery utilizes switching power supply output constant voltage to charge electric motor car battery, switching power supply includes primary control circuit, primary control circuit is used for controlling switching power supply's primary switch, its characterized in that: an auxiliary winding power supply circuit and an input capacitor power supply circuit are arranged, when the auxiliary winding power supply circuit supplies power normally, the auxiliary winding power supply circuit is used for supplying power to the primary side control circuit, and when the auxiliary winding power supply circuit supplies power abnormally, the input capacitor power supply circuit is used for supplying power to the primary side control circuit;
the input capacitor power supply circuit specifically comprises an input capacitor of a switching power supply, a DC-DC circuit and an input capacitor control switch, wherein the input capacitor is connected with the positive end and the negative end of the input side of the switching power supply, one end of the input capacitor control switch is connected with the positive end of the input side of the switching power supply, the other end of the input capacitor control switch is connected with one end of the DC-DC circuit, and the other end of the DC-DC circuit is used as a power supply end to be connected with a power pin of a primary side control circuit;
the control method comprises the steps that a first control circuit is adopted to conduct on-off control on the input capacitance control switch, the first control circuit comprises a feedback voltage input end, a feedback threshold voltage input end, a short circuit signal input end, an over-temperature signal input end, a power supply abnormal signal input end and a driving signal output end, and the control end of the input capacitance control switch is connected with the driving signal output end through a driving circuit; the first control circuit comprises a first comparator, a first OR gate, a first exclusive-OR gate, a first AND gate, a second AND gate and a third AND gate, wherein the positive input end of the first comparator is connected with the feedback voltage input end, the negative input end of the first comparator is connected with the feedback threshold voltage input end, the output end of the first comparator is connected with one input end of the first OR gate, the other input end of the first OR gate is connected with the short-circuit signal input end, one input end of the first exclusive-OR gate is connected with the output end of the first comparator, the other input end of the first exclusive-OR gate is connected with the output end of the first OR gate, the other input end of the first AND gate is connected with the over-temperature signal input end, the other input end of the first AND gate is connected with the power supply abnormal signal input end, the other input end of the second AND gate is connected with the output end of the first OR gate, the other input end of the second AND gate is connected with the output end of the third AND gate, the other input end of the first AND gate is connected with the output end of the third AND gate, and the third AND gate is connected with the output end of the third AND gate.
2. The constant voltage charging circuit of an electric vehicle battery according to claim 1, wherein: dividing the output voltage of the switching power supply, and then inputting the divided output voltage into the feedback voltage input end; inputting a feedback threshold voltage to the feedback threshold voltage input; inputting a primary switch short-circuit signal to the short-circuit signal input end; inputting an overtemperature signal of a primary switch to the overtemperature signal input end; a power supply abnormality signal reflecting an abnormality of an input voltage of the switching power supply is input to the power supply abnormality signal input terminal.
3. The constant voltage charging circuit of an electric vehicle battery according to claim 1, wherein: the DC-DC circuit is a buck-Boost circuit.
4. The constant voltage charging circuit of an electric vehicle battery according to claim 1, wherein: the input capacitor is an electrolytic capacitor.
5. The constant voltage charging circuit of an electric vehicle battery according to claim 1, wherein: the driving circuit is a totem pole driving circuit.
6. The constant voltage charging circuit of an electric vehicle battery according to claim 1, wherein: the primary side switch and the input capacitance control switch of the switching power supply adopt MOS tubes or IGBT.
7. The constant voltage charging circuit of an electric vehicle battery according to claim 1, wherein: the auxiliary winding power supply circuit specifically comprises a transformer auxiliary winding of an open source power supply, a third diode and a fifth capacitor, wherein the anode of the third diode is connected with one end of the transformer auxiliary winding, the cathode of the third diode is connected with one end of the fifth capacitor, the other end of the transformer auxiliary winding is connected with the other end of the fifth capacitor and is grounded, and the cathode of the third diode is used as a power supply end to be connected with a power pin of the primary side control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410004957.7A CN117498510B (en) | 2024-01-03 | 2024-01-03 | Constant voltage charging circuit of electric vehicle battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| KR19990084821A (en) * | 1998-05-11 | 1999-12-06 | 신광윤 | Electrical storage control system of all-weather optical energy |
| CN101510730A (en) * | 2002-11-14 | 2009-08-19 | 艾科嘉公司 | Power converter and system for controlling multi power converters |
| CN205248775U (en) * | 2015-12-08 | 2016-05-18 | 广州金升阳科技有限公司 | Switching power supply's output short circuit protection circuit |
| CN106341048A (en) * | 2016-09-12 | 2017-01-18 | 辉芒微电子（深圳）有限公司 | Constant voltage switch power supply |
| CN206452296U (en) * | 2016-10-27 | 2017-08-29 | 广州金升阳科技有限公司 | A kind of ultra-wide input voltage range Switching Power Supply start-up circuit |
| CN111628654A (en) * | 2019-02-28 | 2020-09-04 | 东南大学 | Switching power supply circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007295761A (en) * | 2006-04-27 | 2007-11-08 | Matsushita Electric Ind Co Ltd | Switching power supply |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990084821A (en) * | 1998-05-11 | 1999-12-06 | 신광윤 | Electrical storage control system of all-weather optical energy |
| CN101510730A (en) * | 2002-11-14 | 2009-08-19 | 艾科嘉公司 | Power converter and system for controlling multi power converters |
| CN205248775U (en) * | 2015-12-08 | 2016-05-18 | 广州金升阳科技有限公司 | Switching power supply's output short circuit protection circuit |
| CN106341048A (en) * | 2016-09-12 | 2017-01-18 | 辉芒微电子（深圳）有限公司 | Constant voltage switch power supply |
| CN206452296U (en) * | 2016-10-27 | 2017-08-29 | 广州金升阳科技有限公司 | A kind of ultra-wide input voltage range Switching Power Supply start-up circuit |
| CN111628654A (en) * | 2019-02-28 | 2020-09-04 | 东南大学 | Switching power supply circuit |
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| CN117498510A (en) | 2024-02-02 |
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