CN113922669A - Conversion circuit, device and power taking and generating system - Google Patents
Conversion circuit, device and power taking and generating system Download PDFInfo
- Publication number
- CN113922669A CN113922669A CN202111061210.8A CN202111061210A CN113922669A CN 113922669 A CN113922669 A CN 113922669A CN 202111061210 A CN202111061210 A CN 202111061210A CN 113922669 A CN113922669 A CN 113922669A
- Authority
- CN
- China
- Prior art keywords
- switch
- conversion
- module
- power supply
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Abstract
The invention discloses a conversion circuit, a device and a power take-off power generation system, wherein the conversion circuit is connected with a power supply and a load and comprises a first switch, a second switch, an electric energy consumption module and a first conversion module; the first switch and the second switch are connected in series and then are respectively connected with two ends of the power supply; the electric energy consumption module is connected in parallel with the first switch and is used for consuming electric energy; the input end of the first conversion module is connected in parallel with the second switch, and the output end of the first conversion module is connected with the load and used for transmitting the electric energy to the load after first conversion; when the first switch is turned on and the second switch is turned off, the electric energy consumption module is short-circuited, and the first conversion module performs first conversion; when the second switch is turned on and the first switch is turned off, the first conversion module is short-circuited, and the power consumption module consumes power of the power supply. The device and the power taking and generating system adopt the conversion circuit. The technical scheme of the invention is suitable for ensuring the safety of a rear-stage application circuit or load when the power takeoff generator outputs overvoltage.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted power taking and generating, in particular to a conversion circuit, a device and a power taking and generating system.
Background
The power takeoff and power generation system is generally used for automobiles, comprises a power takeoff and power generator and generates power by utilizing kinetic energy required by the running of the automobile, and the power generation amount of the power takeoff and power generator is positively correlated with the rotating speed of the power takeoff and power generator. However, during the actual running process of the vehicle, the rotating speed of the power take-off generator is changed in real time, so that the output voltage of the power take-off generator fluctuates in a large range, and the control characteristic is poor. Especially, when the output voltage is too high, overvoltage phenomenon is easily caused to the application circuit or the load of the later stage.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned drawbacks of the prior art, and to providing a converter circuit, a device and a power take-off generating system adapted to ensure the safety of a subsequent application circuit or load when the power take-off generator outputs an overvoltage.
In order to achieve the above object, a first aspect of the present invention provides a first technical solution: a conversion circuit connects a power supply and a load; it includes: a first switch; the second switch is connected with the first switch in series and then is respectively connected with two ends of the power supply; a power consumption module connected in parallel to the first switch and configured to consume power; the input end of the first conversion module is connected in parallel with the second switch, and the output end of the first conversion module is connected with the load and used for transmitting the electric energy to the load after first conversion; when the first switch is turned on and the second switch is turned off, the electric energy consumption module is short-circuited, and the first conversion module is connected with the power supply and performs the first conversion; when the second switch is turned on and the first switch is turned off, the first conversion module is short-circuited, and the electric energy consumption module is connected with the power supply and consumes electric energy.
In the first technical scheme, the first switch and the second switch are connected in series and then connected with a power supply, the conversion circuit is provided with an electric energy consumption module besides a first conversion module for realizing a main conversion function, and the first switch and the second switch are respectively connected in parallel with the second switch and the first switch, so that the first switch and the second switch are switched on to enable the first conversion module and the electric energy consumption module to be switched into the power supply, the first conversion module is switched off and the electric energy consumption module is switched into to consume power supply electric energy when the power supply voltage is too high, the phenomenon of overvoltage of a rear-stage application circuit or a load is prevented, and the system safety is ensured. In addition, the first switch and the second switch are connected in series and then are connected with a power supply, and integrated switch packaging can be adopted in specific application, so that the cost is lower compared with two separated switch devices.
On the basis of the first technical scheme, the invention also provides a second technical scheme that: the first conversion module comprises an energy storage device, and the first conversion module is used for boosting conversion; the first switch and the second switch are also suitable for forming a second conversion module together with an energy storage device of the first conversion module when the first conversion module does not perform the first conversion, and transmitting electric energy to the load after the second conversion; wherein the second transform is a buck transform.
The second technical scheme aims to provide a material basis for solving the defects of the first technical scheme. Specifically, in the first technical solution, the first conversion module and the electric energy consumption module can only be selectively connected to the power supply, so that the conversion circuit does not actually output when the power supply voltage is too high, and the electric energy cannot flow to the rear stage, which affects the power supply stability of the rear stage. In the second technical scheme, based on the first switch and the second switch establish ties the back circuit structure who connects the power respectively, and first transform module has energy storage device, this makes the accessible to first switch, the second switch carries out conduction control, make the two not only play the effect whether switching of first transform module of control and power consumption module, can also further constitute the second transform module that is suitable for carrying out the step-down transform jointly with energy storage device, and transmit the electric energy that steps down after the second transform for the load, thereby guarantee the power supply stability of back level, and reduce the excessive pressure risk of back level to a certain extent.
On the basis of the second technical scheme, the invention also provides a third technical scheme that: defining two ends of the second switch, which are connected with the first switch and the power supply, as a first terminal and a second terminal respectively; the second switch defines a first path and a second path which are connected in parallel and are unidirectional, the first path allows current to flow from the first terminal to the second terminal when being conducted, and the second path allows current to flow from the second terminal to the first terminal when being conducted; the second transformation module has a first state, a second state and a third state when performing the second transformation; in the first state, the first switch is switched on, the first path of the second switch is switched off, and the energy storage device stores energy; in the second state, the first switch is turned off, a second path of the second switch is turned on, and the energy storage device releases energy and freewheels through the second path; in the third state, the first switch is turned off and the first path of the second switch is turned on, and the power consumption module is connected with the power supply through the first path and consumes power.
In a third technical solution, the second switch is configured to have two unidirectional current paths opposite to each other, and on this basis, in the process of the second conversion module performing the second conversion, in addition to the energy storage process of the energy storage device by using the first switch and the follow current process of the energy storage device by using the second switch, the first path of the second switch may be turned on, so that the electric energy consumption module may be further connected to the power supply after the energy storage device completes the follow current, and thus the voltage reduction function of the second conversion module and the electric energy consumption function of the electric energy consumption module are well combined, so as to be suitable for greatly reducing the output voltage of the conversion circuit when the power supply voltage is seriously overvoltage, thereby reducing the risk of the rear-stage overvoltage, and well balancing two contradictions of the risk of the rear-stage overvoltage and the rear-stage electric energy supply.
On the basis of the third technical scheme, the invention also provides a fourth technical scheme that: the power supply is a direct current power supply; the first switch is an IGBT, and the second switch is an IGBT with an anti-parallel diode; the collector electrode of the first switch is connected with the positive electrode of the power supply, the emitter electrode of the first switch is connected with the collector electrode of the second switch, and the emitter electrode of the second switch is connected with the negative electrode of the power supply; the triode path and the diode path of the second switch respectively form the first path and the second path; the first conversion module is a Boost module and comprises a first inductor, a third switch and a fourth switch; the third switch is a diode, the fourth switch is an IGBT, the anode of the third switch is connected with the collector of the fourth switch, and the emitter of the fourth switch is connected with the cathode of the power supply; the first inductor forms the energy storage device, one end of the energy storage device is connected with the common point of the first switch and the second switch, and the other end of the energy storage device is connected with the common point of the third switch and the fourth switch; wherein the anti-parallel diodes of the first switch, the second switch and the first inductor are adapted to jointly form the second conversion module configured as a Buck voltage module; the cathode of the third switch forms one output end of the first conversion module and the second conversion module, and the cathode of the power supply forms the other output end of the first conversion module and the second conversion module.
In the fourth technical solution, a preferred implementation of the conversion circuit in the circuit structure is provided, that is, the specific structure and connection relationship of the first switch, the second switch, the first conversion module and the second conversion module. Specifically, the first conversion module is a Boost module, and can realize the boosting of the input voltage when the power supply voltage is low so as to meet the use requirement of the later stage. And the first inductance of the Boost module can be effectively multiplexed by the second conversion module which is constructed as the Buck voltage reduction module. In addition, the diode structure of the Boost module can also ensure that the voltage output by the Buck voltage reduction module can be output outwards. On the basis, the second switch is configured to be an IGBT with anti-parallel diodes, so that a diode part of the second switch can be used for controlling the switching of the electric energy consumption module, and a diode part of the second switch can be used for realizing the follow current process of the Buck voltage reduction module, and the second switch, the first switch and the first inductor are further suitable for forming the Buck voltage reduction module together, so that the power supply to the later stage is realized after the voltage reduction. Therefore, in the technical scheme, the first switch, the second switch and the first inductor are suitable for being effectively multiplexed when the conversion circuit is in different working modes, so that the same conversion circuit has multiple working modes, and the device cost is saved.
On the basis of the fourth technical scheme, the invention also provides a fifth technical scheme that: the electric energy consumption module is a first resistor, and two ends of the electric energy consumption module are respectively connected with two ends of the first switch.
In the fifth technical scheme, the electric energy consumption module is configured to be a resistor, the surplus electric energy can be converted into heat energy, the structure is simple, and the electric energy consumption process is safe and stable.
On the basis of the fourth or fifth technical solution, the present invention further provides a sixth technical solution: the system also comprises a bus module and a voltage balancing module; the bus module comprises a first capacitor and a second capacitor, and the first capacitor and the second capacitor are connected in series and then are respectively connected with the cathode of the third switch and the cathode of the power supply; the voltage balancing module comprises a second inductor, a fifth switch and a sixth switch; the fifth switch and the sixth switch are IGBTs, and are connected in series and then are respectively connected with two ends of the bus module; one end of the second inductor is connected with the common point of the fifth switch and the sixth switch, and the other end of the second inductor is connected with the common point of the first capacitor and the second capacitor; and the fifth switch and the sixth switch are switched on, and the second inductor is switched to store energy and release energy so as to balance the voltage of the first capacitor and the second capacitor.
In the sixth technical scheme, a bus module which is usually arranged in the DC-DC converter is introduced to store electric energy, and a voltage balancing module is further arranged to balance the bus voltage, so that the stability of the operation process of the conversion circuit can be ensured.
In order to achieve the above object, the second aspect of the present invention further provides a seventh technical solution: a conversion apparatus comprising a controller and a conversion circuit as described in the first claim; the controller acquires the power supply voltage and controls the first switch to be switched on, the second switch to be switched off and the first conversion module to perform the first conversion when the power supply voltage is lower than a first voltage threshold; the controller also controls the first switch to be switched off and the second switch to be switched on when the power supply voltage is higher than a second voltage threshold; wherein the first voltage threshold is less than or equal to a second voltage threshold.
In the seventh technical scheme, the converter further switches the converter circuit between the boost conversion mode with normal input voltage and the power consumption mode with overvoltage input voltage by judging the voltage threshold value through the controller on the basis of the material of the corresponding converter circuit, and can consume power supply power by cutting off the first converter module and putting the power consumption module into the converter circuit when the power supply voltage is too high, so that the overvoltage phenomenon of a rear-stage application circuit or a load is prevented, and the system safety is ensured.
In order to achieve the above object, the third aspect of the present invention further provides an eighth technical solution: a conversion apparatus comprising a controller and a conversion circuit as described in the second aspect; the controller acquires the power supply voltage and controls the first switch to be switched on, the second switch to be switched off and the first conversion module to perform the first conversion when the power supply voltage is lower than a third voltage threshold; the controller further controls the first transform module not to perform the first transform and the second transform module to perform the second transform when the power supply voltage is above a fourth voltage threshold; wherein the third voltage threshold is less than or equal to a fourth voltage threshold.
In the eighth technical scheme, the converter further performs voltage threshold judgment through the controller on the basis of the material of the corresponding converter circuit to switch the converter circuit between the boost conversion mode in which the input voltage is normal and the buck conversion mode in which the input voltage is overvoltage, and can control the first converter module to be out of work and the second converter module to multiplex the energy storage device of the first converter module to perform buck conversion when the power supply voltage is too high, so that the electric energy stepped down after the second conversion is transmitted to the load, thereby ensuring the power supply stability of the rear stage and reducing the overvoltage risk of the rear stage to a certain extent.
In order to achieve the above object, a fourth aspect of the present invention provides a ninth aspect: a conversion apparatus comprising a controller and a conversion circuit as described in the third, fourth, fifth or sixth aspect; the controller acquires the power supply voltage and controls the first switch to be switched on, the second switch to be switched off and the first conversion module to perform the first conversion when the power supply voltage is lower than a fifth voltage threshold; the controller further controls the first transform module not to perform the first transform and the second transform module to perform the second transform when a supply voltage is above the fifth voltage threshold; when the second conversion module performs the second conversion, the controller further controls the second conversion module to switch between the first state and the second state when the power supply voltage is lower than a sixth voltage threshold, and the controller further controls the second conversion module to switch between the first state, the second state and the third state in sequence when the power supply voltage is higher than the sixth voltage threshold; the fifth voltage threshold is less than a sixth voltage threshold.
In the ninth technical scheme, the converter further switches the converter circuit to be in a boosting conversion mode with normal input voltage, a voltage reduction conversion mode with overvoltage input voltage and a voltage reduction conversion-electric energy consumption coupling mode with serious overvoltage input voltage by judging a voltage threshold through the controller on the basis of the material of the corresponding converter circuit, so that the output voltage of the converter circuit is greatly reduced when the power supply voltage is seriously overvoltage, the risk of back-stage overvoltage is reduced, and the two contradictions of the risk of back-stage overvoltage and the supply of back-stage electric energy are well balanced.
In order to achieve the above object, the fifth aspect of the present invention further provides a tenth technical solution: a power take-off and generation system comprising: the power take-off power generation device generates electric energy in a power take-off power generation mode; and the conversion device according to the seventh, eighth, or ninth aspect, which is connected to the power take-off power generation device to take in electric energy, and converts the electric energy and transmits the converted electric energy to the load.
In the tenth technical scheme, the power taking and generating system adopts the conversion device and the conversion circuit, and inherits all the advantages of the conversion device and the conversion circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a conversion circuit according to an embodiment of the present invention.
FIGS. 2a-2b are state diagrams of a converter circuit in a boost conversion mode according to an embodiment of the present invention;
FIGS. 3a-3b are state diagrams of the conversion circuit in the buck conversion mode according to embodiments of the present invention;
FIG. 4 is a state diagram of the conversion circuit in a power consumption mode according to an embodiment of the present invention;
fig. 5 is a block diagram of a power take-off power generation system according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are presently preferred embodiments of the invention and are not to be taken as an exclusion of other embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, the terms "first", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular sequence. In the claims, the specification and the drawings of the present invention, the terms "including", "having" and their variants, if used, are intended to be inclusive and not limiting. In the claims, the description and the drawings of the present invention, if the term "electrically connected" is used, it is meant to include both direct electrical connection and indirect electrical connection.
Referring to fig. 5, an embodiment of the present invention provides a power take-off power generation system, which is applied to a vehicle-mounted environment and includes a power take-off power generation apparatus, a rectifying apparatus, a dc conversion apparatus, and a load.
The power take-off power generation device is a power take-off generator which generates electric energy by taking off power and generating power by utilizing kinetic energy required when the vehicle runs, as described above. In this embodiment, the power take-off power generation device generates ac power, and the load is a dc load, so that the rectifier device and the dc converter device are provided therebetween. The rectifying device is mainly used for performing ac-dc conversion, and the dc conversion device is mainly used for performing boost conversion to provide dc voltage suitable for use to a load. In other words, the dc conversion device is connected to the power take-off power generation device to receive the electric energy, and converts the electric energy and transmits the converted electric energy to the load.
It should be noted that the present invention is focused on solving the risk of the rear-stage load caused by the overhigh input voltage by improving the dc conversion device, and therefore, other parts of the power take-off power generation system are not described in detail. It is to be understood that the term "too high" is used in a broad sense, and means that the input voltage is too high relative to the voltage required by the load, and thus may include both the case where the input voltage is high and the case where the voltage required by the load is low.
The dc conversion device (hereinafter referred to as a conversion device) includes a conversion circuit and a controller for controlling an operation mode of the conversion circuit. The following describes the transformation circuit (i.e. the hardware part of the transformation apparatus) and then the controller (i.e. the software part of the transformation apparatus) internalizing the different control strategies based on the transformation circuit.
Referring to fig. 1, the inverter circuit for connecting a power source and a load includes a first switch S1, a second switch S2, a power consumption module, a first inverter module, a bus bar module, and a voltage balancing module. In this embodiment, the power supply is an output terminal of the rectifying device, in other words, the power supply is a dc power supply having a positive electrode and a negative electrode.
The first switch S1 and the second switch S2 are connected in series and then connected to two ends of the power source, respectively, wherein the first switch S1 is connected to the positive pole of the power source, and the second switch S2 is connected to the negative pole of the power source. Preferably, the two ends of the second switch S2, which are connected to the first switch S1 and the power supply, are defined as a first terminal and a second terminal, respectively, the second switch S2 defines a first path and a second path that are connected in parallel and are unidirectional, the first path allows current to flow from the first terminal to the second terminal when conducting, and the second path allows current to flow from the second terminal to the first terminal when conducting.
In a specific structure, the first switch S1 is an IGBT, and the second switch S2 is an IGBT with an antiparallel diode. The collector of the first switch S1 is connected to the positive pole of the power supply, the emitter thereof is connected to the collector of the second switch S2, and the emitter of the second switch S2 is connected to the negative pole of the power supply. Since the second switch S2 is an IGBT with an anti-parallel diode, it has a triode path and a diode path that are connected in parallel and flow in opposite directions. The triode path forms the first path and allows current to flow from the collector to the emitter of the second switch S2 when it is conducting. The diode path constitutes the second path, which when conducting allows current to flow from the emitter to the collector of the second switch S2.
It is worth noting that in a specific application, the first switch S1 and the second switch S2 may be packaged in an integrated IGBT, which is less costly than two discrete IGBT devices.
The power consumption module is connected in parallel to the first switch S1 and is used for consuming power. In this embodiment, the power consumption module is a first resistor R1, and two ends of the first resistor R1 are respectively connected to two ends of the first switch S1, so that surplus power can be converted into heat energy, the structure is simple, and the power consumption process is safe and stable.
The input end of the first conversion module is connected in parallel to the second switch S2, and the output end of the first conversion module is connected to the load, and is used for transmitting the electric energy to the load after the first conversion. Preferably, the first conversion module comprises an energy storage device and is used for performing boost conversion. Specifically, the first conversion module is configured as a Boost module, which includes a first inductor L1, a third switch S3, and a fourth switch S4. The third switch S3 is a diode, the fourth switch S4 is an IGBT, an anode of the third switch S3 is connected to a collector of the fourth switch S4, and an emitter of the fourth switch S4 is connected to a cathode of the power supply. The first inductor L1 constitutes the energy storage device, and one end of the first inductor L1 is connected to the common point of the first switch S1 and the second switch S2, and the other end of the first inductor L1 is connected to the common point of the third switch S3 and the fourth switch S4. It goes without saying that the cathode of the third switch S3 constitutes one output terminal of the first conversion module, and the cathode of the power supply constitutes the other output terminal of the first conversion module.
The bus module comprises a first capacitor C1 and a second capacitor C2, and the first capacitor C1 and the second capacitor C2 are connected in series and then are respectively connected with the cathode of the third switch S3 and the cathode of the power supply.
The voltage balancing module includes a second inductor L2, a fifth switch S5, and a sixth switch S6. In this embodiment, the fifth switch S5 and the sixth switch S6 are IGBTs, and are connected in series and then connected to two ends of the bus bar module, respectively. One end of the second inductor L2 is connected to the common point of the fifth switch S5 and the sixth switch S6, and the other end is connected to the common point of the first capacitor C1 and the second capacitor C2. The fifth switch S5 and the sixth switch S6 are switched on, and the second inductor L2 is switched to store energy and release energy, so as to balance the voltages of the first capacitor C1 and the second capacitor C2. In other words, the voltage balancing module is a balanced bridge, for example, when the voltage of the first capacitor C1 is lower than the voltage of the second capacitor C2, the sixth switch S6 is turned on to store part of the energy of the second capacitor C2 in the second inductor L2, and the fifth switch S5 is turned on to release the energy stored in the second inductor L2 to the first capacitor C1, so that the voltages of the two are balanced, and vice versa, thereby ensuring the stability of the operation process of the converter circuit.
Referring next to fig. 2a-4, different switch-on configurations of the converter circuit with the above-described configuration will be described, so that the converter circuit can be in different operation modes to cope with different operation scenarios.
Referring to fig. 2a-2b, when the first switch S1 is turned on and the second switch S2 is turned off, the power consumption module is short-circuited, and the first conversion module is connected to the power source and performs the first conversion. In other words, at this time, the converter circuit is in a normal operating scenario and in a boost conversion mode, that is, the first conversion module operates normally and performs boost conversion, and the energy storage process of the first inductor L1 shown in fig. 2a and the freewheeling process of the first inductor L1 shown in fig. 2b are respectively completed. Since the Boost circuit itself is the prior art, the operation principle thereof will not be described in detail.
Referring to fig. 4, when the second switch S2 is turned on and the first switch S1 is turned off, the first conversion module is short-circuited and the power consumption module is connected to the power source and consumes power. In other words, at this time, the conversion circuit operates in a working scene where the input voltage is too high and is in a power consumption mode, and the electric energy flows through the resistor to convert the surplus electric energy into heat energy and consume the heat energy, so that the overvoltage of the rear stage is prevented.
Under the configuration, the switching of the power consumption module and the first conversion module can be controlled by controlling the conduction or non-conduction of the first switch S1 and the second switch S2, that is, the power consumption module and the first conversion module are controlled to be switched into a power supply, so that the power consumption module is switched off and the power consumption module is switched to consume power when the power supply voltage is too high, thereby preventing the overvoltage phenomenon of a rear-stage application circuit or a load and ensuring the system safety.
Preferably, based on the above-mentioned conversion circuit, the first switch S1 and the second switch S2 are further adapted to form a second conversion module together with the energy storage device of the first conversion module when the first conversion module does not perform the first conversion, and to transfer the electric energy to the load after performing a second conversion, where the second conversion is a step-down conversion. It is understood that, based on the specific circuit configuration shown in fig. 1, the anti-parallel diodes of the first switch S1, the second switch S2 and the first inductor L1 are adapted to jointly constitute the second conversion module configured as a Buck voltage module. The cathode and the power supply cathode of the third switch S3 form two output terminals of the second conversion module, respectively. It can also be seen that the first conversion module and the second conversion module multiplex the first inductor L1 and have the same output, which also constitutes the total output of the entire conversion circuit.
Referring to fig. 3a-3b, the fourth switch S4 is controlled to be turned off, so that the first conversion module cannot work normally and the first conversion cannot be performed, and on the basis, the first switch S1 is controlled to be turned on at a high frequency, so that the first switch S1, the anti-parallel diode of the second switch S2 and the first inductor L1 together form a Buck circuit. At this time, the conversion circuit operates in a working scenario where the input voltage is too high and is in a buck conversion mode, that is, the second conversion module performs buck conversion, and completes the energy storage process of the first inductor L1 shown in fig. 3a and the freewheeling process of the first inductor L1 shown in fig. 3b, respectively. Since the Buck voltage reduction circuit is a prior art, the working principle thereof is not described in detail.
It can be seen that, under the above configuration, the first switch S1 and the second switch S2 not only can control whether the first conversion module and the power consumption module are switched, but also can further form, together with the energy storage device, a second conversion module suitable for performing voltage reduction conversion, and transmit the electric energy subjected to voltage reduction after the second conversion to the load, thereby ensuring the power supply stability of the rear stage and reducing the overvoltage risk of the rear stage to a certain extent.
Further, in conjunction with fig. 3a-3b and fig. 4, the conversion circuit may be configured as follows. The second transformation module has a first state, a second state, and a third state when performing the second transformation.
In the first state, the first switch S1 is turned on and the first path of the second switch S2 is turned off, and the energy storage device stores energy, as shown in fig. 3 a.
In the second state, the first switch S1 is off and the second path of the second switch S2 is on, the energy storage device is de-energized and freewheels through the second path, as shown in fig. 3 b.
In the third state, the first switch S1 is turned off and the first path of the second switch S2 is turned on, and the power consumption module is connected to the power source through the first path and consumes power, as shown in fig. 4.
It can be seen that, under the above configuration, since the second switch S2 is configured to have two unidirectional current paths opposite to each other, in addition to the energy storage process of the energy storage device achieved by the first switch S1 and the freewheeling process of the energy storage device achieved by the second switch S2, the first path of the second switch S2 may be turned on, so that the power consumption module may be further connected to the power supply after the freewheeling of the energy storage device is completed, and the voltage reduction function of the second conversion module and the power consumption function of the power consumption module are well combined, so as to be suitable for greatly reducing the output voltage of the conversion circuit when the voltage of the power supply is severely overvoltage, thereby reducing the risk of the rear-stage overvoltage, and well balancing the two contradictions between the risk of the rear-stage overvoltage and the rear-stage power supply.
Thus, since the first switch S1, the second switch S2 and the first inductor L1 are all suitable to be effectively multiplexed when the conversion circuit is in different operation modes, not only is multiple operation modes of the same conversion circuit realized, but also the device cost is saved.
The controller is described next, with three different control strategies being internalized to form three different conversion means accordingly. The advantages of the converter circuit, the converter device and the power take-off power generation system of the present invention will be made clear by the following description.
Under a first control strategy, the controller obtains the power voltage, and controls the first switch S1 to be turned on, the second switch S2 to be turned off, and the first conversion module to perform the first conversion when the power voltage is lower than a first voltage threshold, as shown in fig. 2a-2 b. The controller also controls the first switch S1 to be turned off and the second switch S2 to be turned on when the power voltage is higher than a second voltage threshold, so that the power consumption module is powered on and consumes power, as shown in fig. 4. Wherein the first voltage threshold is less than or equal to a second voltage threshold. In other words, the first voltage threshold and the second voltage threshold may be the same, or may form a preset voltage range.
Therefore, the first control strategy combines the boost conversion mode and the power consumption mode respectively shown in fig. 2a-2b and fig. 4, the controller switches the boost conversion mode with normal input voltage and the power consumption mode with overvoltage input voltage of the conversion circuit by performing voltage threshold judgment, and can cut off the first conversion module and put into the power consumption module to consume power supply power when the power supply voltage is too high, thereby preventing the overvoltage phenomenon of a rear-stage application circuit or a load and ensuring the system safety.
It will be appreciated that the controller may also include a plurality of modules within it, such as an acquisition module for acquiring voltage, a comparison module for value comparison, and a control module for controlling the switches. In this embodiment, the control module sends out a PWM control signal to control each controllable switch.
Under a second control strategy, the controller obtains the power voltage, and controls the first switch S1 to be turned on, the second switch S2 to be turned off, and the first conversion module to perform the first conversion when the power voltage is lower than a third voltage threshold, as shown in fig. 2a-2 b. The controller also controls the first transform module not to perform the first transform and the second transform module to perform the second transform when the power supply voltage is above a fourth voltage threshold, as shown in fig. 3a-3 b. The third voltage threshold is equal to or less than the fourth voltage threshold, in other words, the third voltage threshold and the fourth voltage threshold may be the same, or may form a preset voltage range.
Therefore, the first control strategy combines the boost conversion mode and the buck conversion mode respectively shown in fig. 2a-2b and fig. 3a-3b, the controller switches the boost conversion mode in which the input voltage is normal and the buck conversion mode in which the input voltage is overvoltage through judging the voltage threshold, and can control the first conversion module not to work and the second conversion module to multiplex the energy storage device of the first conversion module to perform buck conversion when the power voltage is too high, and transmit the electric energy stepped down after the second conversion to the load, thereby ensuring the power supply stability of the rear stage and reducing the overvoltage risk of the rear stage to a certain extent.
It is to be understood that the voltage threshold defined by the second control strategy is different from the voltage threshold defined by the first control strategy in nomenclature, but this is mainly for the purpose of distinguishing different objects in terms, and is not intended to limit the two to be substantially different.
Under a third control strategy, the controller obtains the power voltage, and controls the first switch S1 to be turned on, the second switch S2 to be turned off, and the first conversion module to perform the first conversion when the power voltage is lower than a fifth voltage threshold, as shown in fig. 2a-2 b. The controller also controls the first transform module not to perform the first transform and the second transform module to perform the second transform when a supply voltage is above the fifth voltage threshold. When the second conversion module performs the second conversion, the controller further controls the second conversion module to switch between the first state and the second state when the power supply voltage is lower than a sixth voltage threshold, as shown in fig. 3a-3b, and further controls the second conversion module to switch between the first state, the second state and the third state in sequence when the power supply voltage is higher than the sixth voltage threshold, as shown in fig. 3a-3b and fig. 4. In this embodiment, the fifth voltage threshold is smaller than the sixth voltage threshold.
Therefore, the third control strategy combines the boost conversion mode, the buck conversion mode and the power consumption mode respectively shown in fig. 2a-2b, fig. 3a-3b and fig. 4, and the controller switches the boost conversion mode in which the input voltage is normal, the buck conversion mode in which the input voltage is overvoltage and the buck conversion-power consumption coupling mode in which the input voltage is seriously overvoltage by performing voltage threshold judgment, so that the output voltage of the conversion circuit is greatly reduced when the power supply voltage is seriously overvoltage, the rear-stage overvoltage risk is reduced, and the two contradictions of the rear-stage overvoltage risk and the rear-stage power supply are well balanced.
In summary, based on the conversion circuit of the present invention, different configurations can be performed on the software portion on the basis of the hardware of the same circuit, so that the conversion circuit can operate in different operating modes under the condition of effectively multiplexing a plurality of devices, so as to be suitable for different operating scenarios with different input voltages, and enable the power take-off power generation system to operate safely and stably, and save device cost.
The description of the above specification and examples is intended to be illustrative of the scope of the present invention and is not intended to be limiting. Modifications, equivalents and other improvements which may occur to those skilled in the art and which may be made to the embodiments of the invention or portions thereof through a reasonable analysis, inference or limited experimentation, in light of the common general knowledge, the common general knowledge in the art and/or the prior art, are intended to be within the scope of the invention.
Claims (10)
1. A conversion circuit connects a power supply and a load; it is characterized by comprising:
a first switch;
the second switch is connected with the first switch in series and then is respectively connected with two ends of the power supply;
a power consumption module connected in parallel to the first switch and configured to consume power; and
the input end of the first conversion module is connected in parallel with the second switch, and the output end of the first conversion module is connected with the load and used for transmitting the electric energy to the load after first conversion;
when the first switch is turned on and the second switch is turned off, the electric energy consumption module is short-circuited, and the first conversion module is connected with the power supply and performs the first conversion; when the second switch is turned on and the first switch is turned off, the first conversion module is short-circuited, and the electric energy consumption module is connected with the power supply and consumes electric energy.
2. A conversion circuit as claimed in claim 1, characterized in that: the first conversion module comprises an energy storage device, and the first conversion module is used for boosting conversion;
the first switch and the second switch are also suitable for forming a second conversion module together with an energy storage device of the first conversion module when the first conversion module does not perform the first conversion, and transmitting electric energy to the load after the second conversion; wherein the second transform is a buck transform.
3. A conversion circuit as claimed in claim 2, wherein: defining two ends of the second switch, which are connected with the first switch and the power supply, as a first terminal and a second terminal respectively;
the second switch defines a first path and a second path which are connected in parallel and are unidirectional, the first path allows current to flow from the first terminal to the second terminal when being conducted, and the second path allows current to flow from the second terminal to the first terminal when being conducted;
the second transformation module has a first state, a second state and a third state when performing the second transformation;
in the first state, the first switch is switched on, the first path of the second switch is switched off, and the energy storage device stores energy;
in the second state, the first switch is turned off, a second path of the second switch is turned on, and the energy storage device releases energy and freewheels through the second path;
in the third state, the first switch is turned off and the first path of the second switch is turned on, and the power consumption module is connected with the power supply through the first path and consumes power.
4. A conversion circuit as claimed in claim 3, wherein: the power supply is a direct current power supply;
the first switch is an IGBT, and the second switch is an IGBT with an anti-parallel diode; the collector electrode of the first switch is connected with the positive electrode of the power supply, the emitter electrode of the first switch is connected with the collector electrode of the second switch, and the emitter electrode of the second switch is connected with the negative electrode of the power supply; the triode path and the diode path of the second switch respectively form the first path and the second path;
the first conversion module is a Boost module and comprises a first inductor, a third switch and a fourth switch;
the third switch is a diode, the fourth switch is an IGBT, the anode of the third switch is connected with the collector of the fourth switch, and the emitter of the fourth switch is connected with the cathode of the power supply; the first inductor forms the energy storage device, one end of the energy storage device is connected with the common point of the first switch and the second switch, and the other end of the energy storage device is connected with the common point of the third switch and the fourth switch;
wherein the anti-parallel diodes of the first switch, the second switch and the first inductor are adapted to jointly form the second conversion module configured as a Buck voltage module; the cathode of the third switch forms one output end of the first conversion module and the second conversion module, and the cathode of the power supply forms the other output end of the first conversion module and the second conversion module.
5. A conversion circuit as claimed in claim 4, wherein: the electric energy consumption module is a first resistor, and two ends of the electric energy consumption module are respectively connected with two ends of the first switch.
6. A conversion circuit as claimed in claim 4 or 5, characterized in that: the system also comprises a bus module and a voltage balancing module;
the bus module comprises a first capacitor and a second capacitor, and the first capacitor and the second capacitor are connected in series and then are respectively connected with the cathode of the third switch and the cathode of the power supply;
the voltage balancing module comprises a second inductor, a fifth switch and a sixth switch; the fifth switch and the sixth switch are IGBTs, and are connected in series and then are respectively connected with two ends of the bus module; one end of the second inductor is connected with the common point of the fifth switch and the sixth switch, and the other end of the second inductor is connected with the common point of the first capacitor and the second capacitor; and the fifth switch and the sixth switch are switched on, and the second inductor is switched to store energy and release energy so as to balance the voltage of the first capacitor and the second capacitor.
7. A conversion apparatus comprising a controller and the conversion circuit of claim 1;
the controller acquires the power supply voltage and controls the first switch to be switched on, the second switch to be switched off and the first conversion module to perform the first conversion when the power supply voltage is lower than a first voltage threshold; the controller also controls the first switch to be switched off and the second switch to be switched on when the power supply voltage is higher than a second voltage threshold;
wherein the first voltage threshold is less than or equal to a second voltage threshold.
8. A conversion apparatus comprising a controller and the conversion circuit of claim 2;
the controller acquires the power supply voltage and controls the first switch to be switched on, the second switch to be switched off and the first conversion module to perform the first conversion when the power supply voltage is lower than a third voltage threshold; the controller further controls the first transform module not to perform the first transform and the second transform module to perform the second transform when the power supply voltage is above a fourth voltage threshold;
wherein the third voltage threshold is less than or equal to a fourth voltage threshold.
9. A transducer assembly, characterized by: comprising a controller and a conversion circuit according to any of claims 3-6;
the controller acquires the power supply voltage and controls the first switch to be switched on, the second switch to be switched off and the first conversion module to perform the first conversion when the power supply voltage is lower than a fifth voltage threshold; the controller further controls the first transform module not to perform the first transform and the second transform module to perform the second transform when a supply voltage is above the fifth voltage threshold;
when the second conversion module performs the second conversion, the controller further controls the second conversion module to switch between the first state and the second state when the power supply voltage is lower than a sixth voltage threshold, and the controller further controls the second conversion module to switch between the first state, the second state and the third state in sequence when the power supply voltage is higher than the sixth voltage threshold;
the fifth voltage threshold is less than a sixth voltage threshold.
10. A power take-off and generation system, comprising:
the power take-off power generation device generates electric energy in a power take-off power generation mode; and
the transformation device of claim 7, 8 or 9, which is connected with the power taking and generating device to access electric energy and transform the electric energy to be transmitted to the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061210.8A CN113922669A (en) | 2021-09-10 | 2021-09-10 | Conversion circuit, device and power taking and generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061210.8A CN113922669A (en) | 2021-09-10 | 2021-09-10 | Conversion circuit, device and power taking and generating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113922669A true CN113922669A (en) | 2022-01-11 |
Family
ID=79234458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111061210.8A Pending CN113922669A (en) | 2021-09-10 | 2021-09-10 | Conversion circuit, device and power taking and generating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113922669A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173698A (en) * | 2022-09-07 | 2022-10-11 | 深圳市云天数字能源有限公司 | Boosting circuit and boosting method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560666A (en) * | 2013-11-14 | 2014-02-05 | 南京集能易新能源技术有限公司 | Four-switch voltage boosting and reducing converter with low ripples and control method thereof |
| CN104124861A (en) * | 2013-04-28 | 2014-10-29 | 艾默生网络能源系统北美公司 | Absorption circuit |
| CN107534398A (en) * | 2015-01-29 | 2018-01-02 | 汪洪亮 | Half-bridge inverter unit and inverter |
| US20180287484A1 (en) * | 2017-03-29 | 2018-10-04 | Solaredge Technologies Ltd. | Bypass Circuit and Method to Bypass Power Modules in Power System |
| CN111864852A (en) * | 2020-07-30 | 2020-10-30 | 合肥工业大学 | Charging and discharging control method and system for lithium battery of photovoltaic power generation system |
-
2021
- 2021-09-10 CN CN202111061210.8A patent/CN113922669A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124861A (en) * | 2013-04-28 | 2014-10-29 | 艾默生网络能源系统北美公司 | Absorption circuit |
| CN103560666A (en) * | 2013-11-14 | 2014-02-05 | 南京集能易新能源技术有限公司 | Four-switch voltage boosting and reducing converter with low ripples and control method thereof |
| CN107534398A (en) * | 2015-01-29 | 2018-01-02 | 汪洪亮 | Half-bridge inverter unit and inverter |
| US20180287484A1 (en) * | 2017-03-29 | 2018-10-04 | Solaredge Technologies Ltd. | Bypass Circuit and Method to Bypass Power Modules in Power System |
| CN108695843A (en) * | 2017-03-29 | 2018-10-23 | 太阳能安吉科技有限公司 | Bypass circuit and the method for bypassing power module in the power system |
| CN111864852A (en) * | 2020-07-30 | 2020-10-30 | 合肥工业大学 | Charging and discharging control method and system for lithium battery of photovoltaic power generation system |
Non-Patent Citations (1)
| Title |
|---|
| 李学文、刘雪山、邓锦业、周群: "单电感双输出Buck-Boost变换器低频控制方法", 电力电子技术, vol. 53, no. 2, pages 123 - 125 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173698A (en) * | 2022-09-07 | 2022-10-11 | 深圳市云天数字能源有限公司 | Boosting circuit and boosting method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101652379B1 (en) | Apparatus for transferring energy using power electronics and machine inductance and method of manufacturing same | |
| US7830036B2 (en) | Power electronic module pre-charge system and method | |
| US7728562B2 (en) | Voltage link control of a DC-AC boost converter system | |
| Grbovic et al. | The ultracapacitor-based regenerative controlled electric drives with power-smoothing capability | |
| US10396676B2 (en) | Bidirectional DC-DC converter and control method therefor | |
| CN105790588B (en) | Bidirectional DC-DC power converter for vehicle systems | |
| US20150180352A1 (en) | Controlling a modular converter | |
| US9203323B2 (en) | Very high efficiency uninterruptible power supply | |
| US20160036323A1 (en) | Three port dc-dc converter | |
| JP2013123362A (en) | Charger and charging method of eco-friendly vehicle | |
| US10574144B1 (en) | System and method for a magnetically coupled inductor boost and multiphase buck converter with split duty cycle | |
| KR20110054041A (en) | Bi-directional inverter-charger | |
| US20090243386A1 (en) | Method of controlling fuel cell vehicle and method of controlling dc/dc converter apparatus | |
| CN111224447A (en) | On-vehicle machine that charges of compatible alternating-current charging stake and direct-current charging stake | |
| CN106961150B (en) | Control method and system of composite energy storage battery | |
| US20230344235A1 (en) | Energy storage system | |
| CN102104341B (en) | Single-stage boost inverter | |
| US20110121769A1 (en) | Multi-tasking power processor for a vehicle electric system | |
| CN202474879U (en) | DC (direct current) bus ternary Buck-Boost two-way DC-DC voltage-stabilizing energy storage system | |
| US20140167660A1 (en) | Inverter device | |
| CN113922669A (en) | Conversion circuit, device and power taking and generating system | |
| KR101516899B1 (en) | Power conversion apparatus for vehicle and Method for controling the same | |
| US20090237044A1 (en) | Bidirectional interleaved DC to DC converter utilizing positively coupled filter inductors | |
| CN215956288U (en) | Multi-level inverter circuit | |
| Kumar et al. | A magnetically coupled converter connected three phase voltage source inverter for EV applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |