CN115549267A - Charge-discharge multiplexing circuit, control method thereof and portable air conditioner - Google Patents
Charge-discharge multiplexing circuit, control method thereof and portable air conditioner Download PDFInfo
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- CN115549267A CN115549267A CN202110725405.1A CN202110725405A CN115549267A CN 115549267 A CN115549267 A CN 115549267A CN 202110725405 A CN202110725405 A CN 202110725405A CN 115549267 A CN115549267 A CN 115549267A
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00711—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost 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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charge-discharge multiplexing circuit, a control method thereof and a portable air conditioner, wherein the charge-discharge multiplexing circuit comprises: the rectifying unit is used for converting input alternating current into first direct current; the bidirectional charging and discharging multiplexing unit is used for carrying out voltage reduction conversion on the first direct current to charge the energy storage device, or carrying out voltage boost conversion on the second direct current provided by the energy storage device to supply power to a load, wherein the voltage of the first direct current is greater than that of the second direct current. The problem of among the prior art, adjustable voltage's charge-discharge circuit cost is too high and can not export adjustable DC voltage by the battery under the prerequisite of guaranteeing the circuit cost is solved, electronic components through Buck circuit and Boost circuit share to through electronic chip control charge-discharge mode, make the circuit realize that the charge-discharge is two-way multiplexing, can carry out step-down charge and Boost discharge, this circuit design is simple, easily realizes, and the cost is lower.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a charging and discharging multiplexing circuit, a portable air conditioner and a control method of the charging and discharging multiplexing circuit.
Background
In the related battery technical scheme, a Buck circuit and a Boost circuit are generally adopted to perform the functions of voltage reduction charging and voltage boosting discharging of the battery. The Buck circuit is a common voltage reduction conversion circuit, and converts an input direct current with a fixed voltage value into a direct current with an adjustable voltage value lower than the input voltage value by using the energy storage characteristics of an inductor and a capacitor. The Boost circuit is a common Boost conversion circuit, and converts an input direct current with a fixed voltage value into a direct current with an adjustable voltage value higher than the input voltage value by using the energy storage characteristics of an inductor and a capacitor. As shown in fig. 1, the circuit includes a rectifier circuit, a Buck circuit, and a Boost circuit. The Buck circuit and the Boost circuit are respectively controlled to perform Buck charging and Boost discharging on the battery, and the circuit design increases the circuit cost. The other common battery technical scheme is that only a Buck circuit is designed, and although the design scheme reduces the circuit cost, the design scheme can only carry out direct current step-down charging and cannot output adjustable direct current voltage to supply power to a load.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the present invention is to provide a charge-discharge multiplexing circuit, which solves the problems in the prior art that the charge-discharge circuit with adjustable voltage has too high cost and the battery cannot output adjustable dc voltage to supply power to the load on the premise of ensuring the circuit cost.
A second object of the present invention is to provide a portable air conditioner.
A third objective of the present invention is to provide a control method for a charging and discharging multiplexing circuit.
To achieve the above object, a first embodiment of the present invention provides a charge and discharge multiplexing circuit, which includes a rectifying unit, configured to convert an input ac power into a first dc power; and the bidirectional charging and discharging multiplexing unit is used for carrying out voltage reduction conversion on the first direct current so as to charge the energy storage device, or carrying out voltage boosting conversion on the second direct current provided by the energy storage device so as to supply power to a load, wherein the voltage of the first direct current is greater than that of the second direct current.
According to the charging and discharging multiplexing circuit provided by the embodiment of the invention, the input alternating current is converted into the direct current through the rectifying unit, wherein the rectifying unit can be a rectifying bridge, and the rectified direct current is subjected to voltage reduction conversion through the bidirectional charging and discharging multiplexing unit in the charging and discharging multiplexing circuit so as to charge the energy storage device, or the direct current output by the energy storage device is subjected to voltage boosting conversion so as to supply power to a load. Therefore, electronic components of the Buck circuit and the Boost circuit are shared, and the charge-discharge mode is controlled through the electronic chip, so that the circuit realizes charge-discharge bidirectional multiplexing, can perform Buck charging and Boost discharging, and is simple in design, easy to realize and low in cost.
In addition, the overcurrent protection circuit according to the above embodiment of the present invention may further have the following additional technical features:
optionally, according to an embodiment of the present invention, the bidirectional charge and discharge multiplexing unit performs bidirectional voltage step-up and step-down multiplexing through Buck circuit and Boost circuit multiplexing.
Optionally, according to an embodiment of the present invention, the bidirectional charge and discharge multiplexing unit includes: a first switch tube, a first end of which is connected to the positive electrode of the first direct current; a second switching tube, a first end of the second switching tube being connected to a second end of the first switching tube, a second end of the second switching tube being connected to a negative electrode of the first direct current; one end of the first inductor is connected with the first end of the second switch tube and the second end of the first switch tube respectively, the other end of the first inductor is connected to the anode of the second direct current, and the cathode of the second direct current is connected with the cathode of the first direct current and then grounded.
Optionally, according to an embodiment of the present invention, the first switch tube and the second switch tube are MOSFETs (Metal Oxide Semiconductor Field Effect transistors) with freewheeling diodes, respectively.
Optionally, according to an embodiment of the present invention, the first switching tube and the second switching tube respectively include two IGBTs connected in anti-parallel or two triodes connected in anti-parallel.
Optionally, according to an embodiment of the present invention, when the bidirectional charge and discharge multiplexing unit performs step-down conversion on the first direct current, the second switching tube is turned off when the first switching tube is turned on; when the first switch tube is turned off, the second switch tube is turned on.
Optionally, according to an embodiment of the present invention, when the bidirectional charge and discharge multiplexing unit performs boost conversion on the second direct current provided by the energy storage device, where when the second switching tube is turned on, the first switching tube is turned off; when the second switch tube is turned off, the first switch tube is turned on.
Optionally, according to an embodiment of the present invention, when the bidirectional charge and discharge multiplexing unit performs voltage reduction and conversion on the first direct current, the first switching tube performs PWM control, and the second switching tube maintains an off state; when the bidirectional charging and discharging multiplexing unit carries out boost conversion on second direct current provided by the energy storage device, and the first switch tube keeps an off state, the second switch tube carries out PWM control.
Optionally, according to an embodiment of the present invention, when the bidirectional charge and discharge multiplexing unit performs voltage reduction conversion on the first direct current, a voltage output by the bidirectional charge and discharge multiplexing unit is adjustable according to a charging requirement of the energy storage device.
Optionally, according to an embodiment of the present invention, when the bidirectional charge and discharge multiplexing unit performs boost conversion on the second direct current provided by the energy storage device, a voltage output by the bidirectional charge and discharge multiplexing unit is adjustable according to an operating voltage requirement of the load.
In order to achieve the above object, a second embodiment of the present invention provides a portable air conditioner, which includes the charge and discharge multiplexing circuit in the above embodiment.
According to the portable air conditioner provided by the embodiment of the invention, through the charge-discharge multiplexing circuit in the embodiment, the electronic components of the Buck circuit and the Boost circuit are shared, and the charge-discharge mode is controlled through the electronic chip, so that the circuit realizes charge-discharge bidirectional multiplexing, and can perform Buck charge and Boost discharge.
In order to achieve the above object, a third embodiment of the present invention provides a control method for a charge-discharge multiplexing circuit, the method including a rectifying unit and a bidirectional charge-discharge multiplexing unit, the rectifying unit is configured to convert an input ac power into a first dc power, the bidirectional charge-discharge multiplexing unit is configured to down-convert the first dc power to charge an energy storage device, or up-convert a second dc power provided by the energy storage device to supply power to a load, wherein a voltage of the first dc power is greater than a voltage of the second dc power, and the method includes: detecting the electric quantity information of the energy storage device; when the rectifying unit converts input alternating current into first direct current, if the electric quantity of the energy storage device is determined to be smaller than a preset electric quantity threshold value according to the electric quantity information, the bidirectional charging and discharging multiplexing unit is controlled to perform voltage reduction conversion on the first direct current so as to charge the energy storage device; when the input alternating current does not exist at the input end of the rectifying unit, if the electric quantity of the energy storage device is determined to be larger than a preset electric quantity threshold value according to the electric quantity information, the bidirectional charge-discharge multiplexing unit is controlled to perform boost conversion on the second direct current provided by the energy storage device so as to supply power to the load.
According to the control method of the charge-discharge multiplexing circuit provided by the embodiment of the invention, the input alternating current is converted into the first direct current through the rectifying unit, the electric quantity information of the energy storage device is detected, and the relation between the electric quantity of the energy storage device and the preset electric quantity threshold value is judged. When the electric quantity of the energy storage device is smaller than a preset electric quantity threshold value, controlling the bidirectional charging and discharging multiplexing unit to perform voltage reduction transformation on the first direct current to charge the energy storage device; when no input current is input at the input end of the rectifying unit, and the electric quantity of the energy storage device is determined to be larger than a preset electric quantity threshold value, the bidirectional charging and discharging multiplexing unit is controlled to perform boost conversion on second direct current provided by the energy storage device, and power is supplied to a load. Therefore, the control method has the advantages that the Buck circuit and the Boost circuit share electronic components, the electronic chip controls the charging and discharging mode, the bidirectional charging and discharging multiplexing of the circuit is realized, the voltage reduction charging and the voltage Boost discharging can be realized, the circuit design is simple, the realization is easy, and the cost is low.
Drawings
FIG. 1 is a circuit diagram of a charge/discharge circuit in the related art;
FIG. 2 is a circuit diagram of a charge/discharge multiplexing circuit according to an embodiment of the invention;
FIG. 3 is a circuit schematic of a buck charging circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a boost discharging circuit according to an embodiment of the present invention;
FIG. 5 is a circuit schematic of a boost discharge circuit according to another embodiment of the present invention;
fig. 6 is a block schematic view of a portable air conditioner according to an embodiment of the present invention;
fig. 7 is a flowchart of a control method of a charge and discharge multiplexing circuit according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
A charge and discharge multiplexing circuit, a portable air conditioner, and a control method of the charge and discharge multiplexing circuit according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 2 is a circuit diagram of a charge and discharge multiplexing circuit according to an embodiment of the invention. As shown in fig. 2, the charge-discharge multiplexing circuit 1 includes an ac power supply 10, a rectifying unit 20, a bidirectional charge-discharge multiplexing unit 30, an energy storage device 40, and a load 50.
The rectifying unit 20 may be formed by a diode, and specifically, may be a bridge rectifier circuit; the multiplexing unit 30 may be composed of electronic components such as a MOSFET, an inductor, and a capacitor, and performs voltage-reducing charging on the energy storage device 40 or voltage-increasing power supply on the load 50.
The rectifying unit 20 is configured to convert an input alternating current into a first direct current; the multiplexing unit 30 performs step-down conversion on the first direct current and then charges the energy storage device 40, or when the energy storage device 40 provides the second direct current, the multiplexing unit 30 performs step-up conversion on the second direct current and then supplies power to the load 50. It should be noted that the voltage of the first direct current is greater than the voltage of the second direct current.
Specifically, as shown in fig. 2, one end of the rectifying unit 20 is connected to the ac power supply 10 for converting the input dc power into a first dc power; one end of the multiplexing unit 30 is connected to the other end of the rectified power supply 20 and one end of the load 50, the other end of the multiplexing unit 30 is connected to the energy storage device 40, the multiplexing unit 30 performs step-down conversion on the received first direct current to charge the energy storage device 40, or when the energy storage device 40 provides the second direct current, the multiplexing unit 30 performs step-up conversion on the received second direct current to supply power to the load 50.
It should be noted that the multiplexing Unit 30 further includes a MCU (micro controller Unit) control driving chip and a driving chip, and is configured to control the operating states of the switching tube Q1 and the second switching tube Q2. The energy storage device 40 may be configured by a BMS (Battery Management System) protection board and the Battery module, wherein the BMS protection board may perform overcharge and overdischarge protection on the Battery module. The load 50 may be constituted by a compressor and an inverter module.
Therefore, the charge-discharge multiplexing circuit can solve the problems that in the related technology, the charge-discharge circuit with adjustable voltage is too high in cost and the battery cannot output adjustable direct-current voltage on the premise of ensuring the circuit cost, electronic components of the Buck circuit and the Boost circuit are shared, and the charge-discharge mode is controlled through an electronic chip, so that the charge-discharge bidirectional multiplexing of the circuit is realized, the voltage reduction charge and the voltage Boost discharge can be carried out, the circuit design is simple, the circuit is easy to realize, and the cost is lower.
Specifically, in the embodiment of the present invention, the multiplexing unit 30 performs bidirectional voltage step-up and step-down multiplexing through Buck circuit and Boost circuit multiplexing. In this embodiment, realize two-way Buck-Boost through multiplexing Buck circuit and Boost circuit, can reduce electronic components's use quantity, reduced charge-discharge circuit cost.
Optionally, in a specific embodiment of the present invention, as shown in fig. 2, the multiplexing unit 30 includes a switching tube Q1, a second switching tube Q2, and a first inductor L1. The switching tube Q1, the switching tube Q2, and the inductor L1 are a part of a Buck circuit and a Boost circuit. Wherein, the first end of switch tube Q1 links to each other with first direct current's positive pole, switch tube Q2's first end can link to each other with switch tube Q1's second end, switch tube Q2's second end can link to each other with first direct current's negative pole, inductance L1's one end can link to each other with switch tube Q2's first end and switch tube Q1's second end respectively, inductance L1's the other end can be connected to the second direct current's positive pole, the second direct current's negative pole links to each other the back ground connection with first direct current's negative pole. Wherein the second direct current is provided by the energy storage device 40.
Specifically, in the present embodiment, the switching tube Q1 and the switching tube Q2 may be MOSFETs. The drain electrode of the switching tube Q1 is connected with the positive electrode of the first direct current, the drain electrode of the switching tube Q2 is connected with the source electrode of the switching tube Q1, the source electrode of the switching tube Q2 is connected with the negative electrode of the first direct current, one end of the inductor L1 is connected with the drain electrode of the switching tube Q2 and the source electrode of the switching tube Q1, the other end of the inductor L1 is connected to the positive electrode of the second direct current, and the negative electrode of the second direct current is connected with the negative electrode of the first direct current and then grounded. In this embodiment, through the connection mode of switch tube Q1, switch tube Q2 and inductance L1, this charge-discharge multiplexing circuit can charge energy memory 40 with dropping voltage, or, the power supply of stepping up to load 50, has reduced charge-discharge circuit cost, and the design is simple, easily realizes.
Optionally, in an embodiment of the present invention, the switching transistor Q1 and the switching transistor Q2 are MOSFETs with freewheeling diodes, respectively. The MOSFET of the freewheeling diode has low on-resistance and short reverse recovery time, thereby reducing circuit loss and improving circuit conversion efficiency.
Alternatively, in an embodiment of the present invention, the switch Q1 and the switch Q2 respectively include two IGBTs (Insulated Gate Bipolar transistors) connected in anti-parallel or two transistors connected in anti-parallel.
In an embodiment of the present invention, when the multiplexing unit 30 performs voltage-reducing conversion on the first direct current, the states of the switching tube Q1 and the switching tube Q2 may be different, for example, when the switching tube Q1 is turned on, the switching tube Q2 is turned off; when the switching tube Q1 is turned off, the switching tube Q2 is turned on, that is, when the multiplexing unit 30 performs step-down conversion on the first direct current, the state of the switching tube Q1 is opposite to the state of the switching tube Q2. In this embodiment, by controlling the states of the switching tube Q1 and the switching tube Q2, the current charge-discharge multiplexing circuit can be controlled to be in a step-down charging mode, so that the energy storage device 40 can be charged in a step-down manner, the charging voltage requirement of the energy storage device 40 is met, and the cost of the charge-discharge circuit is reduced.
Similarly, in another embodiment of the present invention, when the multiplexing unit 30 performs the voltage-up conversion on the second dc power provided by the energy storage device 40, the states of the switching tube Q1 and the switching tube Q2 may be different, for example, when the switching tube Q2 is turned on, the switching tube Q1 is turned off, and when the switching tube Q2 is turned off, the switching tube Q1 is turned on, that is, when the multiplexing unit performs the voltage-up conversion on the second dc power provided by the energy storage device, the state of the switching tube Q2 is opposite to the state of the switching tube Q1. In this embodiment, by controlling the states of the switching tube Q1 and the switching tube Q2, the current charge and discharge multiplexing circuit can be controlled to be in a boost power supply mode, so that boost power supply can be performed on the load 50, the voltage requirement for power supply of the load 50 is met, and the cost of the charge and discharge circuit is reduced.
In an embodiment of the present invention, when the multiplexing unit 30 performs voltage-reducing conversion on the first direct current, the switching tube Q1 may perform PWM (Pulse Width Modulation) control, and the switching tube Q2 keeps an off state; when the multiplexing unit 30 performs the step-up conversion of the second dc power, the switching tube Q1 is kept off, and the switching tube Q2 performs the PWM control.
Specifically, in this embodiment, the MCU controls the chip to output a control signal to the driver chip, and the driver chip outputs a driving pulse to perform PWM control on the switching tube Q1, so as to control the switching tube Q1 to be turned on or off, at this time, the switching tube Q2 remains in an off state, and the charge-discharge multiplexing circuit is in a step-down charging mode, and is capable of performing step-down charging on the energy storage device 40. Similarly, the driving chip may also perform PWM control on the switching tube Q2, and further control the switching tube Q2 to be turned on or off, at this time, the switching tube Q1 keeps the off state, and the charge-discharge multiplexing circuit is in the boost power supply mode, so as to boost power to the load 50. Therefore, the charge and discharge multiplexing circuit can perform bidirectional voltage boosting and reducing multiplexing by controlling the states of the switch tube Q1 and the switch tube Q2, so that the use quantity of electronic components is reduced, and the cost of the charge and discharge circuit is reduced.
In an embodiment of the present invention, when the multiplexing unit 30 outputs the first direct current for step-down conversion, the voltage output by the multiplexing unit 30 can be adjusted according to the charging requirement of the energy storage device 40.
Similarly, in another embodiment of the present invention, when the multiplexing unit 30 outputs the second dc power provided by the energy storage device for voltage boost conversion, the voltage output by the multiplexing unit 30 is adjusted according to the operation voltage requirement of the load 50.
In a buck charging embodiment of the present invention, as shown in fig. 3, the ac power source 10 is 220V ac power, and the rectifying unit 20 is a bridge rectifier circuit composed of a diode D2, a diode D3, a diode D4 and a diode D5. Specifically, one end of the ac power supply 10 is connected to the anode of the diode D2 and the cathode of the diode D3; the other end of the ac power supply 10 is connected to the anode of the diode D4 and the cathode of the diode D5. The cathode of the diode D2 and the cathode of the diode D4 are connected with one end of the inductor L2, and the anode of the diode D3 and the anode of the diode D5 are connected and grounded. The other end of the inductor L2 is connected to the drain of the switching tube Q1, and has a first node J1. The gate of the switching tube Q1 is connected to the driving chip, and the source of the switching tube Q1 is connected to one end of the inductor L1 and has a second node J2. The other end of the inductor L1 is connected to one end of the energy storage device 40, and has a third node J3. Among them, the energy storage device 40 is composed of a BMS protection board and a battery module.
One end of the smoothing electrolytic capacitor C2 is connected to the first node J1, and the other end of the smoothing electrolytic capacitor C2 is connected to the anode of the diode D3, the anode of the diode D5, and the ground, and has a fourth node J4. The drain electrode of the switching tube Q2 is connected with the second node J2, the grid electrode of the switching tube Q2 is connected with the driving chip, and the source electrode of the switching tube Q2 is connected with the other end of the smoothing electrolytic capacitor C2 and is grounded. One end of the smoothing electrolytic capacitor C1 is connected to the third node J3, and the other end of the smoothing electrolytic capacitor C1 is connected to the source of the switching tube Q2 and the other end of the energy storage device 40, and is grounded.
One end of the load 50 is connected to the other end of the inductor L2, and the other end of the load 50 is connected to the fourth node J4, where the load 50 may be composed of a compressor and an inverter module. The driving chip is connected with the MCU control chip and performs PWM control on the switching tube Q1 and the switching tube Q2 according to a control signal output by the MCU control chip. In this embodiment, the switching tube Q1 and the switching tube Q2 are MOSFETs with freewheeling diodes, and the freewheeling diodes protect the switching tube Q1 and the switching tube Q2 to prevent the electronic components from being broken down by an excessive voltage spike at the time of turning on the switching tube Q1 and the switching tube Q2 due to the release of electric energy from the inductor L1 when the switching tube Q1 and the switching tube Q2 start to turn on.
When the ac power supply 10 outputs 220V ac power, the charge-discharge multiplexing circuit performs step-down charging on the energy storage device 40, and the charging current direction is as shown in fig. 3. The alternating current flows through the bridge rectifier circuit to convert the alternating current into a first direct current, and the first direct current flows through the inductor L2 to charge the smoothing electrolytic capacitor C2. At this time, the switching tube Q1 may be PWM controlled and the switching tube Q2 may be off controlled. Specifically, the MCU control chip outputs a control signal to the driving chip, the driving chip outputs a driving pulse to control the on or off of the switch tube Q1, and the MCU control chip outputs a control signal to the driving chip to drive the off of the switch tube Q2. When the gate voltage of the switching tube Q1 is at a high level, the switching tube Q1 is turned on, and the first direct current flows through the inductor L1, the smoothing electrolytic capacitor C1, the BMS protection board, and the battery module, and charges the smoothing electrolytic capacitor C1 and the energy storage device 50. When the grid voltage of the switching tube Q1 is at a low level, the switching tube Q1 is cut off, the smoothing electrolytic capacitor C1 starts to release electric energy, and at the moment, the inductor L1, the smoothing electrolytic capacitor C1, the BMS protection board, the battery module and the freewheeling diode of the switching tube Q2 form a circuit loop, and the circuit continuously performs step-down charging on the battery module. The charge-discharge multiplexing circuit based on the embodiment can step down the voltage V2 of the smoothing electrolytic capacitor C2 to convert the voltage V1 of the smoothing electrolytic capacitor C1, and the voltage V1 can be adjusted within a voltage range smaller than V2 according to the operating voltage requirement of the load.
It should be noted that, in this embodiment, the switching tube Q2 may also be controlled by PWM, specifically, the MCU control chip outputs a control signal to the driving chip, and the driving chip outputs a driving pulse to control the switching tube Q2 to be turned on or turned off, but in this case, the state of the switching tube Q1 is opposite to the state of the switching tube Q2, that is, when the switching tube Q1 is turned on, the switching tube Q2 is turned off; when the switching tube Q1 is turned off, the switching tube Q2 is turned on.
Therefore, the charge-discharge multiplexing circuit based on the embodiment shares the electronic components of the Buck circuit and the Boost circuit, controls the charge-discharge mode through the electronic chip, realizes charge-discharge bidirectional multiplexing, can perform voltage-reduction charge and voltage-boosting discharge, and is simple in design, easy to realize and low in cost.
In an embodiment of the present invention for boosting power, as shown in fig. 4, when the ac power supply 10 does not output ac power, the charge-discharge multiplexing circuit boosts power to the load 50, and the direction of the power supply current is shown in fig. 4. The battery module outputs current to the circuit through the BMS protection board to charge the smoothing electrolytic capacitor C1. At this time, in this embodiment, the switching tube Q2 may be PWM-controlled, and the switching tube Q1 may be off-controlled. Specifically, the MCU control chip outputs a control signal to the driving chip, the driving chip outputs a driving pulse to control the on or off of the switching tube Q2, and the MCU control chip outputs a control signal to the driving chip to drive the off of the switching tube Q1. When the grid voltage of the switching tube Q2 is at a high level, the switching tube Q2 is switched on, the second direct current flows through the inductor L1, the inductor L1 converts the electric energy into potential energy to be stored, and the smooth electrolytic capacitor C1 is charged; when the gate voltage of the switching tube Q2 is at a low level, the switching tube Q2 is turned off, and at this time, the energy storage device 40, the smoothing electrolytic capacitor C1, the inductor L1, the freewheeling diode of the switching tube Q1, the smoothing electrolytic capacitor C2, and the load 50 form a circuit loop, and after a current flows through the switching tube Q1, the smoothing electrolytic capacitor C2 is charged and the load 50 is supplied with power. When the switching tube Q2 is in the off state, the bus voltage V1 can be boosted and converted into the voltage V2 across the smoothing electrolytic capacitor C2, that is, the power supply voltage V2 of the load 50, by discharging the smoothing electrolytic capacitor C1 and discharging the stored current through the inductor L1. The bus voltage V1 is the voltage across the electrolytic capacitor C1, and the voltage V2 is the voltage across the electrolytic capacitor C2, and the charge-discharge multiplexing circuit according to this embodiment can adjust the voltage V2 of the smoothing electrolytic capacitor C2 within a range larger than the voltage V1 of the smoothing electrolytic capacitor C1 according to the load operation voltage requirement.
In this embodiment, the switching tube Q1 and the switching tube Q2 are both MOSFETs. The switch tube Q1 can also be controlled by PWM, specifically, the MCU control chip outputs a control signal to the driving chip, and the driving chip outputs a driving pulse to control the on or off of the switch tube Q1. The state of the switching tube Q1 is opposite to that of the switching tube Q2, namely when the switching tube Q1 is switched on, the switching tube Q2 is switched off; when the switching tube Q1 is turned off, the switching tube Q2 is turned on.
Therefore, the charge-discharge multiplexing circuit based on the embodiment shares the electronic components of the Buck circuit and the Boost circuit, controls the charge-discharge mode through the electronic chip, realizes charge-discharge bidirectional multiplexing, can perform voltage-reduction charge and voltage-boosting discharge, and is simple in design, easy to realize and low in cost.
In another embodiment of the present invention for boosting and supplying power, as shown in fig. 5, the switching tube Q1 is an anti-parallel structure of IGBT1 and IGBT2, the switching tube Q2 is an anti-parallel structure of IGBT3 and IGBT4, and the circuit connections of other parts are the same as those in fig. 2 and fig. 3, and are not repeated herein. The switching tube Q1 and the switching tube Q2 are both controlled by PWM.
Specifically, the MCU control chip outputs a control signal to the driving chip, the driving chip outputs a driving pulse to the grid electrode of the switching tube Q1 and the grid electrode of the switching tube Q2, the driving pulse controls the switching tube Q1 and the switching tube Q2 to be switched on or switched off, and the state of the switching tube Q1 is opposite to that of the switching tube Q2, namely when the switching tube Q2 is switched on, the switching tube Q1 is switched off; when the switching tube Q2 is closed, the switching tube Q1 is switched on. When the grid voltage of the switching tube Q2 is at a high level, the switching tube Q2 is switched on, the second direct current flows through the inductor L1, the inductor L1 converts the electric energy into potential energy to be stored, and the smooth electrolytic capacitor C1 is charged; when the gate voltage of the switching tube Q2 is at a low level, the switching tube Q2 is turned off, and at this time, the energy storage device 40, the smoothing electrolytic capacitor C1, the inductor L1, the IGBT2 of the switching tube Q1, the smoothing electrolytic capacitor C2, and the load 50 form a circuit loop, and after a current flows through the switching tube Q1, the smoothing electrolytic capacitor C2 is charged and the load 50 is supplied with power. When the switching tube Q2 is in the off state, the bus voltage V1 can be boosted and converted to the voltage V2 across the smoothing electrolytic capacitor C2, that is, the power supply voltage V2 of the load 50 by discharging the smoothing electrolytic capacitor C1 and discharging the stored current through the inductor L1. The charge-discharge multiplexing circuit based on the embodiment can adjust the voltage V2 of the smoothing electrolytic capacitor C2 within a range larger than the voltage V1 of the smoothing electrolytic capacitor C1 according to the load operation voltage requirement.
Therefore, the charge-discharge multiplexing circuit based on the embodiment shares the electronic components of the Buck circuit and the Boost circuit, controls the charge-discharge mode through the electronic chip, realizes charge-discharge bidirectional multiplexing, can perform voltage-reduction charge and voltage-boosting discharge, and is simple in design, easy to realize and low in cost.
In another embodiment of the present invention, the switch Q1 is two transistors connected in anti-parallel, and the switch Q2 is two transistors connected in anti-parallel, and the states of the switch Q1 and the switch Q2 can be controlled by PWM. Specifically, the MCU control chip outputs a control signal to the driving chip, the driving chip outputs a driving pulse to control the on or off of the switching tube Q1 and the switching tube Q2, and the state of the switching tube Q1 is opposite to that of the switching tube Q2, namely when the switching tube Q2 is on, the switching tube Q1 is off; when the switching tube Q2 is closed, the switching tube Q1 is switched on.
Fig. 6 is a block diagram schematically illustrating a portable air conditioner according to an embodiment of the present invention. As shown in fig. 6, the present invention further provides a portable air conditioner 2, and the portable air conditioner 2 includes the charge and discharge multiplexing circuit 1 described in the above embodiment.
According to the portable air conditioner provided by the embodiment of the invention, the Buck circuit and the Boost circuit in the charge-discharge multiplexing circuit share electronic components, and the charge-discharge mode is controlled by the electronic chip, so that the charge-discharge bidirectional multiplexing of the circuit is realized, the step-down charging and the step-up discharging can be carried out, and the circuit has the advantages of simple design, easiness in realization and lower cost.
Fig. 7 is a flowchart of a control method of a charge and discharge multiplexing circuit according to an embodiment of the invention. As shown in fig. 7, the present invention further provides a control method of a charging and discharging multiplexing circuit, the control method includes a rectifying unit and a bidirectional charging and discharging multiplexing unit, the rectifying unit is configured to convert an input ac power into a first dc power, the bidirectional charging and discharging multiplexing unit is configured to perform a step-down conversion on the first dc power to charge an energy storage device, or perform a step-up conversion on a second dc power provided by the energy storage device to supply power to a load, wherein a voltage of the first dc power is greater than a voltage of the second dc power, the method includes:
s01, detecting electric quantity information of the energy storage device;
specifically, the electric quantity information of the energy storage device is detected through the BMS system, wherein the energy storage device may be a lithium battery, and the electric quantity information may include information such as voltage, current, and temperature of the lithium battery.
S02, when the rectifying unit converts the input alternating current into a first direct current, if the electric quantity of the energy storage device is determined to be smaller than a preset electric quantity threshold value according to the electric quantity information, the bidirectional charging and discharging multiplexing unit is controlled to perform voltage reduction conversion on the first direct current so as to charge the energy storage device;
specifically, as shown in fig. 3, the rectifying unit may be a bridge rectifier circuit, and after the input end of the bridge rectifier circuit receives 220V alternating current, a first direct current is output, and then a relationship between the electric quantity of the current energy storage device and a preset electric quantity threshold is determined according to the electric quantity information collected by the BMS system, and when the electric quantity of the current energy storage device is smaller than the preset electric quantity threshold, the bidirectional charging and discharging multiplexing unit is controlled to perform voltage reduction conversion on the first direct current so as to charge the energy storage device. For example, the preset charge threshold may be 48V.
And S03, when no alternating current is input at the input end of the rectifying unit, if the electric quantity of the energy storage device is determined to be larger than a preset electric quantity threshold value according to the electric quantity information, the bidirectional charge-discharge multiplexing unit is controlled to perform boost conversion on the second direct current provided by the energy storage device so as to supply power to the load.
Specifically, when the input end of the bridge rectifier circuit is in non-intersection point electric input, the relation between the electric quantity of the current energy storage device and a preset electric quantity threshold value is judged according to the electric quantity information collected by the BMS system, and when the electric quantity of the current energy storage device is larger than the preset electric quantity threshold value, the bidirectional charging and discharging multiplexing unit is controlled to perform voltage boosting conversion on second direct current provided by the energy storage device so as to supply power to a load. For example, the preset charge threshold may be 48V.
It should be noted that, in the embodiment of the present invention, reference may be made to the specific implementation of the charge and discharge multiplexing circuit in the foregoing embodiment, and a specific structure of the charge and discharge multiplexing circuit in this embodiment may also be referred to the description of the specific structure of the charge and discharge multiplexing circuit in the foregoing embodiment, which is not described herein again.
Therefore, according to the control method of the charge-discharge multiplexing circuit based on the embodiment, the electronic components of the Buck circuit and the Boost circuit are shared, and the charge-discharge mode is controlled by the electronic chip, so that the charge-discharge bidirectional multiplexing of the circuit is realized, the step-down charging and the step-up discharging can be performed, and the circuit is simple in design, easy to implement and low in cost.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second", and the like, used in the embodiments of the present invention, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated in the embodiments. Thus, a feature of an embodiment of the present invention that is defined by the terms "first," "second," etc. may explicitly or implicitly indicate that at least one of the feature is included in the embodiment. In the description of the present invention, the word "plurality" means at least two or two and more, such as two, three, four, etc., unless specifically limited otherwise in the examples.
In the present invention, unless otherwise explicitly stated or limited by the relevant description or limitation, the terms "mounted," "connected," and "fixed" in the embodiments are to be understood in a broad sense, for example, the connection may be a fixed connection, a detachable connection, or an integrated connection, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. Those of ordinary skill in the art will understand the specific meaning of the above terms in the present invention according to their specific implementation.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A charge and discharge multiplexing circuit, comprising:
a rectifying unit for converting an input alternating current into a first direct current;
the bidirectional charging and discharging multiplexing unit is used for carrying out voltage reduction conversion on the first direct current to charge the energy storage device, or carrying out voltage boost conversion on the second direct current provided by the energy storage device to supply power to a load, wherein the voltage of the first direct current is greater than that of the second direct current.
2. The charge-discharge multiplexing circuit of claim 1 wherein the bidirectional charge-discharge multiplexing unit performs bidirectional Buck-Boost multiplexing via Buck and Boost circuit multiplexing.
3. The charge-discharge multiplexing circuit according to claim 2, wherein the bidirectional charge-discharge multiplexing unit comprises:
a first switch tube, a first end of which is connected to the positive electrode of the first direct current;
a second switching tube, a first end of the second switching tube is connected to a second end of the first switching tube, and a second end of the second switching tube is connected to a negative electrode of the first direct current;
one end of the first inductor is connected with the first end of the second switch tube and the second end of the first switch tube respectively, the other end of the first inductor is connected to the anode of the second direct current, and the cathode of the second direct current is connected with the cathode of the first direct current and then grounded.
4. The charge-discharge multiplexing circuit of claim 3 wherein the first switch transistor and the second switch transistor are MOSFETs with freewheeling diodes, respectively.
5. The charge-discharge multiplexing circuit of claim 3 wherein the first switching tube and the second switching tube each comprise two IGBTs connected in anti-parallel or two triodes connected in anti-parallel.
6. The charge-discharge multiplexing circuit according to any one of claims 3 to 5, wherein when said bidirectional charge-discharge multiplexing unit down-converts said first direct current, wherein,
when the first switch tube is switched on, the second switch tube is switched off; when the first switch tube is turned off, the second switch tube is turned on.
7. The charging and discharging multiplexing circuit according to any of claims 3-5, wherein when the bidirectional charging and discharging multiplexing unit performs a boost conversion on the second direct current provided by the energy storage device, wherein,
when the second switch tube is switched on, the first switch tube is switched off; when the second switch tube is switched off, the first switch tube is switched on.
8. The charge-discharge multiplexing circuit according to claim 4, wherein when the bidirectional charge-discharge multiplexing unit performs step-down conversion on the first direct current, the first switching tube performs PWM control, and the second switching tube maintains an off state; when the bidirectional charging and discharging multiplexing unit carries out boost conversion on second direct current provided by the energy storage device, and the first switch tube keeps an off state, the second switch tube carries out PWM control.
9. The charging and discharging multiplexing circuit of claim 1 wherein when the bidirectional charging and discharging multiplexing unit down-converts the first direct current, the voltage output by the bidirectional charging and discharging multiplexing unit is adjustable according to the charging requirement of the energy storage device.
10. The charging and discharging multiplexing circuit of claim 1 wherein when the bidirectional charging and discharging multiplexing unit performs boost conversion on the second direct current provided by the energy storage device, a voltage output by the bidirectional charging and discharging multiplexing unit is adjustable according to an operating voltage requirement of the load.
11. A portable air conditioner characterized by comprising the charge and discharge multiplexing circuit according to any one of claims 1 to 10.
12. A control method of a charge-discharge multiplexing circuit, the charge-discharge multiplexing circuit comprising a rectifying unit and a bidirectional charge-discharge multiplexing unit, the rectifying unit is configured to convert an input alternating current into a first direct current, the bidirectional charge-discharge multiplexing unit is configured to down-convert the first direct current to charge an energy storage device, or up-convert a second direct current provided by the energy storage device to supply power to a load, wherein a voltage of the first direct current is greater than a voltage of the second direct current, the method comprising:
detecting electric quantity information of the energy storage device;
when the rectifying unit converts input alternating current into first direct current, if the electric quantity of the energy storage device is determined to be smaller than a preset electric quantity threshold value according to the electric quantity information, the bidirectional charging and discharging multiplexing unit is controlled to perform voltage reduction conversion on the first direct current so as to charge the energy storage device;
when the input alternating current does not exist at the input end of the rectifying unit, if the electric quantity of the energy storage device is determined to be larger than the preset electric quantity threshold value according to the electric quantity information, the bidirectional charging and discharging multiplexing unit is controlled to perform boost conversion on the second direct current provided by the energy storage device so as to supply power to the load.
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| CN202110725405.1A CN115549267A (en) | 2021-06-29 | 2021-06-29 | Charge-discharge multiplexing circuit, control method thereof and portable air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117811364A (en) * | 2024-03-01 | 2024-04-02 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117811364A (en) * | 2024-03-01 | 2024-04-02 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
| CN117811364B (en) * | 2024-03-01 | 2024-06-11 | 深圳麦格米特电气股份有限公司 | Voltage holding circuit and method, power supply circuit and electronic equipment |
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