CN109412419B - Method and device for reducing peak voltage of isolated bidirectional direct current converter - Google Patents
Method and device for reducing peak voltage of isolated bidirectional direct current converter Download PDFInfo
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a method and a device for reducing spike voltage of an isolated bidirectional direct current converter, wherein the method comprises the following steps: acquiring a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter; and adjusting the voltage of the high-voltage side according to the reference voltage value so as to reduce the peak voltage of the isolated bidirectional direct current converter. The invention discloses a method and a device for reducing peak voltage of an isolated bidirectional direct current converter, which can reduce the peak voltage by regulating the voltage without increasing the system cost.
Description
Technical Field
The invention relates to the technical field of direct current converters, in particular to a method and a device for reducing peak voltage of an isolated bidirectional direct current converter.
Background
With the development of the energy storage industry, the bidirectional direct current converter is widely applied, and the low-voltage battery is widely applied to a small-capacity energy storage system. Based on the consideration of safety, fig. 1 is a schematic circuit diagram of an existing isolated bidirectional dc converter, and as shown in fig. 1, charging and discharging of a low-voltage battery need to be electrically isolated, so that an isolated bidirectional dc converter topology is widely applied.
For a low-voltage battery energy storage system, under the condition of transmitting the same power, because the charging and discharging current is large, fig. 2 is a schematic diagram of an existing large turn-off current, as shown in fig. 2, the abscissa in fig. 2 is time, the unit is second(s), the ordinate is turn-off current (which may also be called peak current), the unit is ampere (a), and a large peak voltage is generated at the moment when the switching device is turned off at the low-voltage side of the isolated bidirectional dc converter. This spike voltage can damage the switching devices and increase electromagnetic interference. The conventional solution is to select switching devices with higher voltage levels and add absorbing or filtering means, but at increased system cost.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method and an apparatus for reducing a peak voltage of an isolated bidirectional dc converter, which can reduce the peak voltage by adjusting a voltage without increasing a system cost.
In order to achieve the object, in a first aspect, the present invention provides a method for reducing spike voltage of an isolated bidirectional dc converter, including:
acquiring a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter;
and adjusting the voltage of the high-voltage side according to the reference voltage value so as to reduce the peak voltage of the isolated bidirectional direct-current converter.
In a second aspect, the present invention provides an apparatus for reducing spike voltage of an isolated bidirectional dc converter, including:
the controller is used for acquiring a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter and outputting a corresponding control signal according to the reference voltage value;
and the direct current or alternating current converter is used for adjusting the voltage of the high-voltage side according to the control signal so as to reduce the peak voltage of the isolated bidirectional direct current converter.
According to the method and the device for reducing the peak voltage of the isolated bidirectional direct current converter, the peak current is changed by adjusting the voltage of the high-voltage side, so that the peak voltage is reduced. Compared with the traditional method, the method and the device for reducing the spike voltage of the isolated bidirectional direct current converter can effectively reduce the spike voltage without increasing extra cost.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic circuit diagram of a prior art isolated bidirectional DC converter;
FIG. 2 is a diagram of a prior art larger off current;
fig. 3 is a schematic flowchart of a method for reducing spike voltage of an isolated bidirectional dc converter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for reducing spike voltage of an isolated bidirectional dc converter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a control scheme for reducing peak voltages of an isolated bidirectional DC converter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of off-current after being controlled by the control scheme provided in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 3 is a schematic flowchart of a method for reducing spike voltage of an isolated bidirectional dc converter according to an embodiment of the present invention, and as shown in fig. 3, the method for reducing spike voltage of an isolated bidirectional dc converter according to an embodiment of the present invention may be applied to an isolated bidirectional dc converter with battery charging and discharging functions, and the method includes:
s301: and acquiring a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter.
Specifically, the isolated bidirectional dc converter includes a low-voltage side (battery side) and two high-voltage sides, where the low-voltage side has a lower voltage and a higher current; the voltage on the high-voltage side is larger and the current is smaller. According to the embodiment of the invention, the peak current can be changed by acquiring the reference voltage value of the high-voltage side voltage and adjusting the high-voltage side voltage according to the reference voltage value, so that the peak voltage is reduced.
S302: and adjusting the voltage of the high-voltage side according to the reference voltage value so as to reduce the peak voltage of the isolated bidirectional direct current converter.
In particular, based on the generation of the peak voltage VpThe principle of (1): vp＝Lδ*di/dtWherein L isδRepresenting parasitic inductance on the low voltage side, di/dtRepresents the derivative of the current with respect to time, i.e., the rate of change of the current; it is known that reducing the peak current at the time of turn-off can effectively reduce the peak voltage.
According to the power formula:
and according to the formula for peak current:
wherein, IpIndicating peak current value, P charge and discharge power, V1Representing the low side voltage, V2Representing the low-side voltage, N the transformer transformation ratio, LrRepresenting the resonant inductance of the high-voltage side, fsThe switching frequency of the isolated bidirectional dc converter is shown, and D represents the phase shift ratio (control amount) of the isolated bidirectional dc converter. It is known that increasing the high-side voltage V2 reduces the low-side spike current.
As can be seen from the above, in the embodiments of the present invention, under the condition that the output power is kept unchanged, although the high-voltage side voltage is increased to reduce the low-voltage side peak current and the high-voltage side peak current is increased, the high-voltage side peak current is inherently small, and therefore, the high-voltage side peak current does not have a great influence. Therefore, the scheme provided by the embodiment of the invention does not increase the system cost when the low-voltage side peak voltage is reduced by adjusting the high-voltage side voltage.
According to the method for reducing the peak voltage of the isolated bidirectional direct current converter, the peak current is changed by adjusting the voltage of the high-voltage side, so that the peak voltage is reduced. Compared with the traditional method, the method for reducing the peak voltage of the isolated bidirectional direct current converter provided by the embodiment of the invention can effectively reduce the peak voltage without increasing extra cost.
Further, in the above embodiment, before obtaining the reference voltage value of the voltage at the high-voltage side of the isolated bidirectional dc converter, the method for reducing the spike voltage of the isolated bidirectional dc converter according to the embodiment of the present invention may further include: and acquiring the voltage and the charge and discharge power of the low-voltage side of the isolated bidirectional direct current converter.
In this embodiment, only the voltage V on the low voltage side needs to be measured1And the charging and discharging power can obtain the reference voltage value of the high-voltage side voltage.
Optionally, calculating a reference voltage value according to the voltage at the low-voltage side of the isolated bidirectional dc converter and the charge-discharge power may include: using a formula
Calculating a reference voltage value V; wherein, IpIndicating peak current value, P charge and discharge power, V1Representing the low-side voltage, N the transformer transformation ratio, LrRepresenting the resonant inductance of the high-voltage side, fsAnd the switching frequency of the isolated bidirectional direct current converter is shown.
Obtaining a reference voltage value of a high-voltage side voltage of the isolated bidirectional direct current converter may include: and calculating a reference voltage value according to the voltage of the low-voltage side of the isolated bidirectional direct current converter and the charge and discharge power.
In particular, the peak current value I may be limitedpThat is, the peak current value I can be obtained in advancepWherein the peak current value IpCan be based on experience or actual needs of the skilled personAnd (4) presetting. The embodiment is based on the pre-known peak current value IpAnd a measured low-side voltage V1And charge and discharge power, a reference voltage value at which the high-side voltage can be obtained by calculation.
In this embodiment, the charge and discharge power P may be directly obtained; or the charge-discharge current I can be obtained first, and the charge-discharge power P can be obtained through calculation according to the charge-discharge current I.
Note that, the transformer transformation ratio N, the resonance inductance L on the high-voltage siderAnd the switching frequency f of the isolated bidirectional DC convertersAre all known variables that can be preset in the controller by a technician. The transformer transformation ratio N refers to a voltage ratio or a current ratio between a primary winding and a secondary winding of the transformer, and the calculation principle is the same as that in the prior art, and this embodiment is not limited and described herein.
Further, in the above embodiment, obtaining the low-voltage side voltage and the charge and discharge power of the isolated bidirectional dc converter may include:
obtaining low-voltage side voltage V of isolated bidirectional DC converter through voltage acquisition meter1(ii) a Obtaining charging and discharging current I through a current collection table, and adopting a formula P ═ V1And obtaining the charge and discharge power P.
Specifically, the voltage of the low-voltage side of the isolated bidirectional direct-current converter can be directly collected through the voltage collection meter, and the collected voltage of the low-voltage side is sent to the controller. The discharging current (current) can be collected through the current collecting meter, the collected discharging current is sent to the controller, and the controller calculates the discharging power P according to the discharging current. In this embodiment, the peak current value I is obtained in advancepAnd a low-side voltage V1And the discharge current I calculates a reference voltage value of the high-side voltage V2.
It should be noted that, in the embodiment of the present invention, an implementation principle of the voltage acquisition meter for acquiring the voltage at the low voltage side of the isolated bidirectional dc converter is the same as an implementation principle of the voltage acquisition meter in the prior art, and an implementation principle of the current acquisition meter for acquiring the discharge current is the same as an implementation principle of the current acquisition meter in the prior art, which is not limited and described herein. Further, in the above-mentioned embodiment, adjusting the high-side voltage according to the reference voltage value may include: and adjusting the voltage of the high-voltage side through a direct current or alternating current converter according to the reference voltage value.
In this embodiment, the controller outputs a corresponding control signal according to the reference voltage value of the high-side voltage V2, and controls the dc or ac converter to make the high-side voltage V2 meet the reference voltage requirement.
It should be noted that, the implementation principle of the dc or ac converter adjusting the high-voltage side voltage in the embodiment of the present invention is the same as the implementation principle of the dc or ac converter adjusting the voltage in the prior art, and the embodiment of the present invention is not limited and described herein. Optionally, adjusting the high-side voltage according to the reference voltage value in this embodiment may include: and acquiring a high-voltage side voltage V2, calculating the difference value between the high-voltage side voltage V2 and a reference voltage value, and adjusting the high-voltage side voltage V2 according to the difference value. In this embodiment, the high-voltage side voltage V2 may be collected by the voltage collection meter, and the collected high-voltage side voltage V2 may be sent to the controller.
It should be noted that the principle of collecting the high-voltage side voltage by the voltage collection meter in the embodiment of the present invention is the same as that of collecting the voltage by the voltage collection meter in the prior art, and the embodiment of the present invention is not limited and described herein.
Fig. 4 is a schematic structural diagram of a device for reducing spike voltage of an isolated bidirectional dc converter according to an embodiment of the present invention, and as shown in fig. 4, the device for reducing spike voltage of an isolated bidirectional dc converter according to an embodiment of the present invention includes: a controller 41 and a dc or ac converter 42.
The controller 41 is configured to obtain a reference voltage value of a high-voltage side voltage of the isolated bidirectional dc converter, and output a corresponding control signal according to the reference voltage value.
And the direct current or alternating current converter 42 is used for adjusting the voltage of the high-voltage side according to the control signal so as to reduce the peak voltage of the isolated bidirectional direct current converter.
Further, in the above embodiments, as shown in fig. 4, the reduction provided by the embodiments of the present inventionThe isolated bidirectional DC converter spike voltage device further comprises: a voltage collecting module 43 for collecting the voltage V at the low voltage side of the isolated bidirectional dc converter1And sends the low side voltage to the controller 41.
Optionally, the voltage collecting module 43 may include a voltage collecting table.
The obtaining of the reference voltage value of the high-voltage side voltage of the isolated bidirectional dc converter by the controller 41 includes: and calculating the reference voltage value according to the low-voltage side voltage and the charge-discharge power.
Further, in the above embodiment, as shown in fig. 4, the apparatus for reducing spike voltage of the isolated bidirectional dc converter according to the embodiment of the present invention further includes: and the current acquisition module 44 is configured to acquire the charge and discharge current I of the isolated bidirectional dc converter, and send the charge and discharge current to the controller 41.
Optionally, the current collection module 44 may include a current collection meter.
The controller 41 calculates a reference voltage value from the low-voltage side voltage and the charge-discharge power, and includes: using the formula P ═ V1And obtaining the charge and discharge power P.
Further, in the above embodiment, the calculating, by the controller 41, the reference voltage value according to the voltage on the low-voltage side of the isolated bidirectional dc converter and the charging and discharging power includes:
using a formula
Calculating the reference voltage value V;
wherein, IpIndicating peak current value, P charge and discharge power, V1Representing the low-side voltage, N the transformer transformation ratio, LrRepresenting the resonant inductance of the high-voltage side, fsAnd the switching frequency of the isolated bidirectional direct current converter is shown.
FIG. 5 is a schematic diagram of a control scheme for reducing peak voltages of an isolated bidirectional DC converter according to an embodiment of the present invention; fig. 6 is a schematic diagram of off-current after being controlled by the control scheme provided in the embodiment of the present invention. As shown in the figure5 and 6, respectively, obtaining the peak current limit value (peak current I)p) A low-voltage side voltage V1 and a current or power reference value (charging/discharging current I or power P), according to the peak current limit value (peak current I)p) The reference voltage value of the high-voltage side voltage V2 is calculated by the low-voltage side voltage V1 and a current or power reference value (charging and discharging current I or power P), so that the reference voltage value of the high-voltage side voltage V2 is obtained, and the controller 2 controls the direct current or alternating current converter according to the reference voltage value of the V2 to enable the high-voltage side voltage V2 of the direct current or alternating current converter to meet the requirement of the reference voltage, so that the peak current of the V1 side is reduced, and further the peak voltage of the V1 side is reduced. Meanwhile, the controller 1 can control the bidirectional isolation type bidirectional direct current converter to realize the control of charge and discharge power or current. In this embodiment, the controller 2 is responsible for voltage control of V2, and the controller 1 is responsible for control of charging and discharging power or current, which not only ensures charging and discharging control function, but also reduces peak current at the V1 side, thereby reducing peak voltage.
In this embodiment, the voltage on the low-voltage side of the isolated bidirectional dc converter may be directly collected by the voltage collection meter, and the collected voltage on the low-voltage side may be sent to the controller. The discharging current (current) can be collected through the current collecting meter, the collected discharging current is sent to the controller, and the controller calculates the discharging power P according to the discharging current.
In this embodiment, the adjusting, by the controller 2, the high-side voltage according to the reference voltage value may include: and acquiring a high-voltage side voltage V2, calculating the difference value between the high-voltage side voltage V2 and a reference voltage value, and adjusting the high-voltage side voltage V2 according to the difference value. Alternatively, the high-side voltage V2 may be collected by a voltage collection table, and the collected high-side voltage V2 may be transmitted to the controller 2.
In fig. 6, the abscissa represents time in seconds(s), and the ordinate represents off current (which may also be referred to as peak current) in amperes (a).
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (8)
1. A method for reducing spike voltage of an isolated bidirectional DC converter comprises the following steps:
acquiring a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter;
adjusting the voltage of the high-voltage side according to the reference voltage value so as to reduce the peak voltage of the isolated bidirectional direct-current converter;
before the reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter is obtained, the method further includes:
acquiring the voltage and the charging and discharging power of the low-voltage side of the isolated bidirectional direct current converter;
the obtaining of the reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct current converter comprises:
and calculating the reference voltage value according to the voltage of the low-voltage side of the isolated bidirectional direct current converter and the charging and discharging power.
2. The method according to claim 1, wherein the obtaining of the low-voltage side voltage and the charge-discharge power of the isolated bidirectional direct current converter comprises:
acquiring the voltage V of the low-voltage side of the isolated bidirectional direct current converter through a voltage acquisition meter1；
Obtaining charging and discharging current I through a current collection table, and adopting a formula P ═ V1And obtaining the charge and discharge power P.
3. The method of claim 2, wherein calculating the reference voltage value according to the low-voltage side voltage and the charging and discharging power of the isolated bidirectional DC converter comprises:
using a formula
Calculating the reference voltage value V;
wherein, IpIndicating peak current value, P charge and discharge power, V1Representing the low-side voltage, N the transformer transformation ratio, LrRepresenting the resonant inductance of the high-voltage side, fsAnd the switching frequency of the isolated bidirectional direct current converter is shown.
4. The method of any of claims 1-3, wherein said adjusting said high side voltage based on said reference voltage value comprises:
and adjusting the voltage of the high-voltage side through a direct current or alternating current converter according to the reference voltage value.
5. An apparatus for reducing peak voltages in an isolated bi-directional dc converter, comprising:
the controller is used for acquiring a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter and outputting a corresponding control signal according to the reference voltage value;
the direct current or alternating current converter is used for adjusting the voltage of the high-voltage side according to the control signal so as to reduce the peak voltage of the isolated bidirectional direct current converter;
the device further comprises: the voltage acquisition module is used for acquiring the low-voltage side voltage V1 of the isolated bidirectional direct current converter and sending the low-voltage side voltage to the controller;
the controller obtains a reference voltage value of the voltage at the high-voltage side of the isolated bidirectional direct-current converter, and the method comprises the following steps: and calculating the reference voltage value according to the low-voltage side voltage and the charge-discharge power.
6. The apparatus of claim 5, further comprising: the current acquisition module is used for acquiring the charging and discharging current I of the isolated bidirectional direct current converter and sending the charging and discharging current to the controller;
the controller calculates the reference voltage value according to the low-voltage side voltage and the charging and discharging power, and comprises the following steps: using the formula P ═ V1And obtaining the charge and discharge power P.
7. The apparatus of claim 6, wherein the controller calculates the reference voltage value according to the isolated bidirectional DC converter low-voltage side voltage and the charging and discharging power, and comprises:
using a formula
Calculating the reference voltage value V;
wherein, IpIndicating peak current value, P charge and discharge power, V1Representing the low-side voltage, N the transformer transformation ratio, LrRepresenting the resonant inductance of the high-voltage side, fsAnd the switching frequency of the isolated bidirectional direct current converter is shown.
8. The apparatus of claim 6 or 7, wherein the current collection module comprises a current collection meter; the voltage acquisition module comprises a voltage acquisition meter.
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| CN103187879A (en) * | 2013-04-23 | 2013-07-03 | 盐城工学院 | Bidirectional direct current converter based on immittance network, and digital control system and method of bidirectional direct current converter |
| CN104143919A (en) * | 2013-05-07 | 2014-11-12 | 台达电子工业股份有限公司 | Bidirectional DC Converter |
| CN105634264A (en) * | 2016-01-28 | 2016-06-01 | 广东工业大学 | Load full-range soft switching control method for bidirectional DC/DC converter |
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