CN115566906A - DC/DC conversion circuit, control method thereof, conversion device and electronic equipment - Google Patents

DC/DC conversion circuit, control method thereof, conversion device and electronic equipment Download PDF

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Publication number
CN115566906A
CN115566906A CN202211309220.3A CN202211309220A CN115566906A CN 115566906 A CN115566906 A CN 115566906A CN 202211309220 A CN202211309220 A CN 202211309220A CN 115566906 A CN115566906 A CN 115566906A
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China
Prior art keywords
conversion unit
conversion
unit
voltage value
circuit
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CN202211309220.3A
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童文平
袁策策
赵密
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Ecoflow Technology Ltd
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Ecoflow Technology Ltd
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Priority to CN202211309220.3A priority Critical patent/CN115566906A/en
Publication of CN115566906A publication Critical patent/CN115566906A/en
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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
    • H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a DC/DC conversion circuit and a control method, a conversion device and an electronic device thereof, wherein the method comprises the following steps: when a discharging instruction is detected, sending a first detection signal to the AC/DC conversion unit, wherein the first detection signal is used for instructing the AC/DC conversion unit to convert the electric signal output by the battery module according to a first duty ratio and a first frequency; when the voltage of the first end of the DC/AC conversion unit is detected to rise to a first preset voltage value within a first preset time period, generating a first control signal according to a discharge instruction, and sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit; and when the voltage of the first end of the DC/AC conversion unit is detected to be lower than a second preset voltage value within a first preset time, determining that the DC/AC conversion unit has short-circuit abnormality, and not responding to the discharge instruction. According to the technical scheme, the application range of short circuit detection is expanded, and the reliability and safety of the working process of the DC/DC conversion circuit are improved.

Description

DC/DC conversion circuit, control method thereof, conversion device and electronic equipment
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a DC/DC conversion circuit, a control method thereof, a conversion device and electronic equipment.
Background
At present, many devices can be charged and discharged. In the process of charging and discharging the device, the electrical signal needs to be converted by the conversion circuit to obtain the required electrical signal. In some cases, a short circuit phenomenon may occur inside the conversion circuit, and thus, when the conversion circuit works, the short circuit condition needs to be detected so as to prevent damage to electric equipment or safety accidents. In the related art, ATE (automatic test equipment) is used to test whether a short circuit occurs in a conversion circuit, however, this test method can only detect a short circuit phenomenon caused by material abnormality, and generally, the detection is performed before the equipment is put into use, which has certain limitations.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
The present application aims to provide a DC/DC conversion circuit, a control method thereof, a conversion device and an electronic apparatus, so as to optimize the problem that the short circuit detection mode of the conversion circuit in the related art has certain limitations.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to an aspect of an embodiment of the present application, there is provided a control method of a DC/DC conversion circuit including a DC/AC conversion unit, a transformation unit, and an AC/DC conversion unit, a first end of the DC/AC conversion unit being for connection with a first device, a second end of the DC/AC conversion unit being for connection with a first end of the transformation unit, a first end of the AC/DC conversion unit being for connection with a second end of the transformation unit, a second end of the AC/DC conversion unit being for connection with a battery module; the control method comprises the following steps:
when a discharging instruction is detected, sending a first detection signal to the AC/DC conversion unit, wherein the first detection signal is used for indicating the AC/DC conversion unit to convert the electric signal output by the battery module according to a first duty ratio and a first frequency, and the electric signal converted by the AC/DC conversion unit is output to the DC/AC conversion unit through the voltage transformation unit;
when it is detected that the voltage of the first end of the DC/AC conversion unit rises to a first preset voltage value within a first preset time period, generating a first control signal according to the discharge instruction, and sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit, wherein the first control signal is used for controlling the DC/DC conversion circuit to output the required power of the first device;
when the voltage of the first end of the DC/AC conversion unit is lower than a second preset voltage value within the first preset time period, determining that the DC/AC conversion unit has short circuit abnormality, and not responding to the discharge instruction, wherein the second preset voltage value is smaller than the first preset voltage value.
According to an aspect of an embodiment of the present application, there is provided a DC/DC conversion circuit including a DC/AC conversion unit, a transformation unit, an AC/DC conversion unit, and a control unit, a first end of the DC/AC conversion unit being configured to be connected to a first device, a second end of the DC/AC conversion unit being connected to a first end of the transformation unit, a first end of the AC/DC conversion unit being connected to a second end of the transformation unit, and a second end of the AC/DC conversion unit being configured to be connected to a battery module; the control unit is used for executing:
when a discharging instruction is detected, sending a first detection signal to the AC/DC conversion unit, where the first detection signal is used to instruct the AC/DC conversion unit to convert an electrical signal output by the battery module according to a first duty cycle and a first frequency, and the electrical signal converted by the AC/DC conversion unit is output to the DC/AC conversion unit through the voltage transformation unit;
when it is detected that the voltage of the first end of the DC/AC conversion unit rises to a first preset voltage value within a first preset time period, generating a first control signal according to the discharge instruction, and sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit, wherein the first control signal is used for controlling the DC/DC conversion circuit to output the required power of the first device;
when the voltage of the first end of the DC/AC conversion unit is lower than a second preset voltage value within the first preset time period, determining that the DC/AC conversion unit has short circuit abnormality, and not responding to the discharge instruction, wherein the second preset voltage value is smaller than the first preset voltage value.
According to an aspect of embodiments of the present application, there is provided a conversion apparatus including an AC/DC conversion circuit and the DC/DC conversion circuit provided in any of the embodiments of the present application;
the AC/DC conversion circuit is connected with the DC/DC conversion circuit through a bus capacitor as the first device.
According to an aspect of an embodiment of the present application, there is provided an electronic device including the conversion circuit provided in any embodiment of the present application.
In the technical scheme provided by the embodiment of the application, the first detection signal is sent to the AC/DC conversion unit when the discharging instruction is detected, so that the AC/DC conversion unit converts the electric signal output by the battery module according to a first duty ratio and a first frequency, and then the voltage of the first end of the DC/AC conversion unit is detected; when the voltage rises to a first preset voltage value within a first preset time period, the DC/DC conversion circuit is normal, and therefore a first control signal is generated to output the required power of the first device; when the voltage is lower than a second preset voltage value within a first preset time period, the short circuit abnormality of the DC/AC conversion unit is indicated, and the discharging instruction is not responded at this time so as to prevent the circuit from being burnt. According to the technical scheme, short-circuit detection can be performed when the discharge instruction is detected every time, so that the application range of short-circuit detection is expanded, and the reliability and safety of the working process of the DC/DC conversion circuit are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 schematically shows a block diagram of a DC/DC conversion circuit to which the technical solution of the present application is applied.
Fig. 2 schematically illustrates a flowchart of a control method of a DC/DC conversion circuit according to an embodiment of the present application.
Fig. 3 schematically shows a schematic diagram of an application scenario of the present technical solution.
Fig. 4 schematically shows a control method of the DC/DC conversion circuit in one embodiment of the present application.
Fig. 5 schematically shows a block diagram of a DC/DC conversion circuit provided in an embodiment of the present application.
Fig. 6 schematically shows a circuit configuration diagram of a DC/DC conversion circuit provided in an embodiment of the present application.
Fig. 7 schematically illustrates a schematic diagram of a conversion apparatus provided in an embodiment of the present application.
Fig. 8 schematically illustrates a schematic diagram of a conversion apparatus provided by an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Fig. 1 schematically shows a block diagram of a DC/DC conversion circuit to which the technical solution of the present application is applied. As shown in fig. 1, the DC/DC conversion circuit 100 includes a DC/AC conversion unit 110, a transformation unit 120, and an AC/DC conversion unit 130. A first terminal of the DC/AC converting unit 110 is for connection with the first device 200, a second terminal of the DC/AC converting unit 110 is for connection with a first terminal of the transforming unit 120, a first terminal of the AC/DC converting unit 130 is for connection with a second terminal of the transforming unit 120, and a second terminal of the AC/DC converting unit 130 is for connection with the battery module 300.
In an embodiment of the present application, the first device 200 may be a PFC (Power Factor Correction) device, and the first end of the DC/AC conversion unit 110 is connected to the PFC device through a DC bus, and a bus capacitor is connected to the DC bus.
The DC/DC conversion circuit 100 provided by the embodiment of the application can operate in a discharging mode. In the discharging mode, the battery module 300 supplies power to the DC/DC conversion circuit 100. The electrical signal output from the battery module 300 is processed by the AC/DC conversion unit 130, the voltage transformation unit 120, and the DC/AC conversion unit 110 in sequence, and then output to the first device 200 for use by the first device 200.
Fig. 2 schematically shows a flowchart of a control method of a DC/DC conversion circuit provided in an embodiment of the present application, and the control method can be applied to a DC/DC conversion circuit provided in any embodiment of the present application, such as the DC/DC conversion circuit shown in fig. 1.
As shown in fig. 2, the control method of the DC/DC conversion circuit provided in the embodiment of the present application includes steps 210 to 230, which are specifically as follows:
step 210, when a discharging instruction is detected, sending a first detection signal to the AC/DC conversion unit, where the first detection signal is used to instruct the AC/DC conversion unit to convert the electrical signal output by the battery module according to the first duty ratio and the first frequency, and the electrical signal converted by the AC/DC conversion unit is output to the DC/AC conversion unit through the voltage transformation unit.
Specifically, the discharge instruction is an instruction generated when a discharge operation is triggered, and is used for instructing the DC/DC conversion circuit to operate in a discharge mode in which the DC/DC conversion circuit converts an electrical signal output by the battery module and outputs the converted electrical signal to the first device.
Exemplarily, fig. 3 schematically shows a schematic diagram of an application scenario of the technical solution of the present application. As shown in fig. 3, the battery module includes a battery pack BAT, a first switching tube S1, a second switching tube S2, and an output terminal PP (i.e., P + and P-shown in fig. 3). The first switching tube S1 has a first body diode D1, and the second switching tube has a second body diode D2. The output terminal PP is used for connecting a target device, and the target device includes the DC/DC conversion circuit provided in the embodiment of the present application. For example, the output end PP is used for connecting a power conversion device, the power conversion device includes a DC/DC conversion circuit provided in the embodiment of the present application, and when the battery module is connected to the power conversion device, a second end of an AC/DC conversion unit in the DC/DC conversion circuit is connected to the output end of the battery module. The first switching transistor S1 is also referred to as a charging MOS transistor, and the second switching transistor S2 is also referred to as a discharging MOS transistor.
In the non-operating state, the first switching tube S1 and the second switching tube S2 are in an off state by default. Before the battery module discharges through the equipment connected with the output end PP, the battery management system BMS in the battery module closes the second switch tube S2 first to control the first switch tube S1 to keep the disconnection state, and the electric signal of the battery pack BAT flows to the equipment connected with the output end PP through the first body diode D1 and the second switch tube S2. In some embodiments, before the device connected to the battery module charges the battery pack BAT, the battery management system BMS in the battery module closes the first switching tube S1, the second switching tube S2 maintains an open state, and an electrical signal of the device connected to the battery module flows to the battery pack BAT through the second body diode D2 and the first switching tube S1. In some embodiments, the switch tube is not closed, and only the electrical signal flows through the body diode thereof is to detect the battery module or the device (e.g., power conversion device) connected to the battery module, and the charging and discharging operations are started when the battery module and the HUN device are abnormal.
In one embodiment of the present application, as shown in fig. 3, when the battery module detects that the output terminal PP is connected to the power conversion device, the BMS of the battery module turns on the second switching tube S2, and the first switching tube S1 maintains an off state to trigger the discharging operation of the battery pack BAT, at which time the power conversion device determines that the discharging command is detected when the electrical signal input from the battery module is detected.
Optionally, in an embodiment, the first switch tube S1 of the battery module is in an open state by default, the second switch tube S2 is in a closed state by default, and when the output end PP of the battery module is connected to the power conversion device, the electrical signal of the battery pack BAT is discharged to the outside through the first diode D1 and the second switch tube S2. At this time, the power conversion device determines that a discharge command is detected when the electrical signal input by the battery module is detected.
Optionally, a power-on button is arranged on the battery module, and when the user triggers the power-on button, the discharging operation of the battery module is triggered by default, and at this time, both the first switch S1 and the first switch S2 on the battery module are closed. At this time, the power conversion device determines that a discharge command is detected when the electrical signal input by the battery module is detected.
Optionally, in an embodiment, after the power conversion device detects that the output end PP is connected to the battery module, a command for closing the second switch tube S2 is sent to the battery module by default, and the command may be a discharge command.
Optionally, in an embodiment, a discharge button is disposed on the power conversion device, and when the power conversion device is connected to the output end PP of the battery module, and a user triggers the discharge button on the power conversion device, the power conversion device sends an instruction for closing the second switch tube S2 to the battery module, where the instruction may be used as a discharge instruction.
When the discharging instruction is detected, a first detection signal is sent to the AC/DC conversion unit, the first detection signal is a signal with a first duty ratio and a first frequency, the AC/DC conversion unit converts an electric signal output by the battery module under the action of the first detection signal, and the converted electric signal is output to the DC/AC conversion unit through the voltage transformation unit. Illustratively, the first detection signal is a PWM (Pulse Width Modulation) wave signal having a first duty ratio of 13% and a first frequency of 55 KHz.
Step 220, when it is detected that the voltage at the first end of the DC/AC conversion unit rises to a first preset voltage value within a first preset time period, generating a first control signal according to the discharge instruction, and sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit, where the first control signal is used to control the DC/DC conversion circuit to output the required power of the first device.
Step 230, when it is detected that the voltage at the first end of the DC/AC conversion unit is lower than a second preset voltage value within a first preset time period, it is determined that the DC/AC conversion unit has a short circuit abnormality, and then the discharging instruction is not responded, where the second preset voltage value is smaller than the first preset voltage value.
Specifically, when the AC/DC converting unit operates based on the first detection signal having the first duty ratio and the first frequency, the voltage of the first terminal of the DC/AC converting unit will rise under normal conditions. When the voltage of the first end of the DC/AC conversion unit is detected to rise to a first preset voltage value within a first preset time period, the DC/AC conversion unit can work normally, at the moment, a first control signal is generated according to a discharge instruction, and the first control signal is sent to the AC/DC conversion unit and the DC/AC conversion unit and used for controlling the DC/DC conversion circuit to operate in a discharge mode, so that the DC/DC conversion circuit outputs the required power of the first device.
When the voltage of the first end of the DC/AC conversion unit is detected to be lower than the second preset voltage value within the first preset time period, it indicates that the DC/AC conversion unit cannot perform conversion processing on the input electrical signal, and there may be a short circuit abnormality. Obviously, the second predetermined voltage value is smaller than the first predetermined voltage value, and the second predetermined voltage value may be 0.
In the technical solution provided in the embodiment of the present application, when a discharge instruction is detected, a first detection signal is sent to an AC/DC conversion unit, so that the AC/DC conversion unit converts an electrical signal output by a battery module according to a first duty cycle and a first frequency, and then detects a voltage at a first end of the DC/AC conversion unit; when the voltage rises to a first preset voltage value within a first preset time period, the DC/DC conversion circuit is normal, and therefore a first control signal is generated according to the discharge instruction to output the required power of the first device; when the voltage is lower than a second preset voltage value within a first preset time period, the short circuit abnormality of the DC/AC conversion unit is indicated, and the discharging instruction is not responded so as to avoid circuit burnout. According to the technical scheme, short-circuit detection can be performed when the discharge instruction is detected every time, so that the application range of short-circuit detection is expanded, and the reliability and safety of the working process of the DC/DC conversion circuit are improved.
In an embodiment of the present application, during the normal operation of the DC/AC converting unit in the discharging mode, the voltage at the first terminal of the DC/AC converting unit may also be detected in real time or at regular time. When it is detected that the voltage at the first end of the DC/AC converting unit drops to the third predetermined voltage value, indicating that the DC/AC converting unit is out of order, the DC/AC converting unit may malfunction, with a risk of short-circuiting, the sending of the first control signal to the AC/DC converting unit and the DC/AC converting unit is stopped, i.e. the DC/DC converting circuit is stopped. The third preset voltage value may be set according to a voltage value of the first terminal of the DC/AC converting unit (the voltage value may be abbreviated as a normal discharge voltage value) when the DC/DC converting circuit normally operates in the discharge mode, for example, the third preset voltage value is set to 30% of the normal discharge voltage value.
In an embodiment of the present application, after the DC/DC conversion circuit stops working, if it is detected that the user triggers the discharging operation again, the process returns to step 210, and the first detection signal is sent again to determine whether the DC/DC conversion circuit can work normally again.
In some cases, the voltage drop of the first terminal of the DC/AC converting unit to the third preset voltage value may be an abnormal condition recoverable in a short time, for example, the voltage drop of the first terminal of the DC/AC converting unit to the third preset voltage value due to an over-high temperature, and when the temperature returns to normal after the DC/DC converting circuit stops operating for a period of time, the DC/DC converting circuit may continue to operate normally, at which time the discharging instruction may be regenerated, and the step 210 is returned to continue the discharging operation.
In one embodiment of the present application, upon determining that there is a short circuit abnormality in the DC/AC conversion unit, the number of abnormality statistics is increased by one. When the abnormal counting times reach the preset counting times, the short circuit abnormal condition of the DC/DC conversion circuit is serious, and the operation of the DC/DC conversion circuit is not responded, namely, the discharging operation can not be carried out through the DC/DC conversion circuit, and the discharging instruction is not responded. For example, in the application scenario shown in fig. 3, when the abnormal statistics number reaches the preset statistics number, the power conversion device is locked, and the power conversion device cannot be enabled, and no longer responds to any operation of the user.
In one embodiment of the present application, the generating of the first control signal includes: acquiring the required power of first equipment; acquiring the discharge power of the battery module; a first control signal is generated according to the required power of the first device and the discharge power of the battery module.
Since the first control signal is used to control the DC/DC conversion circuit to output the required power of the first device, it is necessary to generate the first control signal according to the required power of the first device and the discharge power of the battery module. When the required power of the first device is greater than the discharge power of the battery module, the first control signal may control the DC/DC conversion module to perform a boosting operation; when the required power of the first device is less than the discharge power of the battery module, the first control signal may control the DC/DC conversion module to perform a step-down operation, thereby causing the DC/DC conversion circuit to output the required power of the first device.
Fig. 4 schematically illustrates a control method of a DC/DC conversion circuit in an embodiment of the present application, which may be implemented by a DC/DC conversion circuit provided in any embodiment of the present application, such as the DC/DC conversion circuit shown in fig. 1.
The DC/DC conversion circuit 100 provided in fig. 1 may operate in a charging mode. In the charging mode, the first device 200 supplies power to the DC/DC conversion circuit 100. The electrical signal output by the first device 200 is sequentially processed by the DC/AC converting unit 110, the transforming unit 120, and the AC/DC converting unit 130, and then output to the battery module 300, so as to charge the battery module 300.
As shown in fig. 4, the control method of the DC/DC conversion circuit provided in the embodiment of the present application includes steps 410 to 430, which are specifically as follows:
and step 410, when the charging instruction is detected, sending a second detection signal to the DC/AC converting unit, where the second detection signal is used to instruct the DC/AC converting unit to convert the electrical signal output by the first device according to the second duty cycle and the second frequency, and the electrical signal converted by the DC/AC converting unit is output to the AC/DC converting unit through the transforming unit.
Specifically, the charging instruction is an instruction generated when a charging operation is triggered, and is used for instructing the DC/DC conversion circuit to operate in a charging mode, and in the charging mode, the DC/DC conversion circuit converts an electrical signal output by the first device and outputs the converted electrical signal to the battery module.
In an embodiment of the present application, as shown in an application scenario in fig. 3, an output end PP of the battery module is connected to a power conversion device, and the power conversion device may be connected to a power supply, so that the power supply may charge a battery pack BAT in the battery module through the power conversion device. When the power conversion device detects that the power supply input is provided, the charging instruction is determined to be detected.
In an embodiment of the present application, the power conversion device is connected to a power supply, and the battery module is provided with a charging button. When the battery module is connected with the power conversion equipment, the battery module sends a charging instruction to the power conversion equipment after a user triggers the charging key.
Optionally, in an embodiment, the battery module defaults to open the first switch tube S1 and close the second switch tube S2, when the battery module is connected to the power conversion device, the battery pack BAT in the battery module sends an electrical signal to the power conversion device through the first body diode D1 and the second switch tube S2, and if the power conversion device detects that the power supply is connected and detects an electrical signal of the battery module at the same time, it is determined that the charging instruction is detected.
Optionally, a charging button is provided on the power conversion device, and when the power conversion device is connected to the power supply and the output end PP of the battery module, respectively, the user triggers the charging button on the power conversion device, and the power conversion device determines that the charging instruction is detected.
When the charging instruction is detected, a second detection signal is sent to the DC/AC conversion unit, the second detection signal is a signal with a second duty ratio and a second frequency, the DC/AC conversion unit converts the electric signal output by the first device under the action of the second detection signal, and the converted electric signal is output to the AC/DC conversion unit through the voltage transformation unit. Wherein the first duty cycle is less than the second duty cycle and the first frequency is less than the second frequency. Illustratively, the second detection signal is a PWM wave signal having a second duty ratio of 15% and a second frequency of 150 KHz.
And step 420, when it is detected that the voltage at the first end of the DC/AC conversion unit rises to a fourth preset voltage value within a second preset time period, generating a second control signal according to the charging instruction, and sending the second control signal to the DC/AC conversion unit and the AC/DC conversion unit, where the second control signal is used to control the DC/DC conversion circuit to convert the electric signal output by the first device and output the converted electric signal to the battery module for charging.
Step 430, when it is detected that the voltage at the first end of the DC/AC conversion unit drops to a fifth preset voltage value within the second preset time period, it is determined that the DC/AC conversion unit has a short circuit abnormality, and the discharge instruction is not responded, and the fourth preset voltage value is greater than the fifth preset voltage value.
Specifically, when the DC/AC converting unit operates based on the second detection signal having the second duty ratio and the second frequency, the voltage of the first terminal of the DC/AC converting unit will rise under normal conditions. When the voltage of the first end of the DC/AC conversion unit is detected to rise to a fourth preset voltage value, or when the voltage of the first end of the DC/AC conversion unit is detected to rise to the fourth preset voltage value within a second preset time period, indicating that the DC/AC conversion unit can normally operate, at this time, a second control signal is generated according to the charging instruction, and the second control signal is sent to the AC/DC conversion unit and the DC/AC conversion unit, and is used for controlling the DC/DC conversion circuit to operate in a charging mode, so that the DC/DC conversion circuit converts the electric signal output by the first device and outputs the converted electric signal to the battery module for charging.
When the voltage of the first end of the DC/AC conversion unit is detected to be lower than the fifth preset voltage value within the second preset time period, it indicates that the DC/AC conversion unit cannot perform conversion processing on the input electrical signal, and there may be a short circuit abnormality. Obviously, the fifth predetermined voltage value is smaller than the fourth predetermined voltage value, and the fifth predetermined voltage value may be 0.
In the technical scheme provided by the embodiment of the application, when a charging instruction is detected, a second detection signal is sent to the DC/AC conversion unit, so that the DC/AC conversion unit converts an electric signal output by first equipment according to a second duty ratio and a second frequency, and then detects the voltage of a first end of the DC/AC conversion unit; when the voltage rises to a fourth preset voltage value within a second preset time period, the DC/DC conversion circuit is normal, and therefore a second control signal is generated to charge the battery module; when the voltage is lower than a fifth preset voltage value within a second preset time period, the short circuit abnormality of the DC/AC conversion unit is indicated, and the charging instruction is not responded at the moment so as to avoid circuit burnout. According to the technical scheme, short-circuit detection can be performed when the charging instruction is detected at every time, so that the application range of the short-circuit detection is expanded, and the reliability and the safety of the working process of the DC/DC conversion circuit are improved.
In an embodiment of the present application, during the normal operation of the DC/AC converting unit in the charging mode, the voltage at the first terminal of the DC/AC converting unit may also be detected in real time or at regular time. When it is detected that the voltage at the first end of the DC/AC converting unit drops to the sixth preset voltage value, which indicates that the DC/AC converting unit deviates from normal, the DC/AC converting unit may malfunction, with a risk of short-circuiting, and at this time, the sending of the second control signal to the AC/DC converting unit and the DC/AC converting unit is stopped, i.e. the DC/DC converting circuit is stopped. The sixth preset voltage value may be set according to a voltage value (which may be abbreviated as a normal charging voltage value) of the first terminal of the DC/AC converting unit when the DC/DC converting circuit normally operates in the charging mode, for example, the sixth preset voltage value is set to 30% of the normal charging voltage value.
In an embodiment of the present application, after the DC/DC conversion circuit stops working, if it is detected that the user triggers the charging operation again, the process returns to step 410, and a second detection signal is sent again to determine whether the DC/DC conversion circuit can work normally again.
In one implementation of the present application, statistics of the number of times of abnormality may be performed on the charging process, that is, when it is determined that short-circuit abnormality exists in the DC/AC conversion unit during the charging process, the number of times of charging abnormality statistics is increased by one; when the number of charging abnormality statistics reaches a preset number, the operation of the DC/DC conversion circuit is not responded. It can be understood that the statistics of the number of abnormal times in the charging process is similar to the statistics of the number of abnormal times in the discharging process, and specific details may refer to the related description above and are not repeated herein.
The control method of the DC/DC conversion circuit can detect the short circuit of the DC/DC conversion circuit when charging and discharging operations are carried out each time, is beneficial to improving the working stability of the DC/DC conversion circuit, and eliminates potential safety hazards caused by the short circuit.
It should be noted that although the various steps in this application are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in that particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Embodiments of the DC/DC converter circuit of the present application are described below, which can be used to implement the control method of the DC/DC converter circuit in the above-described embodiments of the present application. Fig. 5 schematically shows a block diagram of a DC/DC conversion circuit provided in an embodiment of the present application. As shown in fig. 5, the DC/DC conversion circuit 100 includes: a DC/AC converting unit 110, a transforming unit 120, an AC/DC converting unit 130, and a control unit 130, a first end of the DC/AC converting unit 110 is for connection with the first device 200, a second end of the DC/AC converting unit 110 is for connection with a first end of the transforming unit 120, a first end of the AC/DC converting unit 130 is for connection with a second end of the transforming unit 120, and a second end of the AC/DC converting unit 130 is for connection with the battery module 300.
The control unit 130 is configured to perform:
when a discharge instruction is detected, sending a first detection signal to the AC/DC conversion unit 130, where the first detection signal is used to instruct the AC/DC conversion unit 130 to convert the electrical signal output by the battery module 300 according to a first duty cycle and a first frequency, and the electrical signal converted by the AC/DC conversion unit 130 is output to the DC/AC conversion unit 110 through the transformation unit 120;
when detecting that the voltage at the first end of the DC/AC converting unit 110 rises to a first preset voltage value within a first preset time period, generating a first control signal according to the discharging instruction, and sending the first control signal to the AC/DC converting unit 130 and the DC/AC converting unit 110, where the first control signal is used to control the DC/DC converting circuit 100 to output the required power of the first device 200;
when it is detected that the voltage at the first end of the DC/AC conversion unit 110 is lower than a second preset voltage value within the first preset time period, it is determined that the DC/AC conversion unit 110 has a short circuit abnormality, and the discharge instruction is not responded, where the second preset voltage value is smaller than the first preset voltage value.
The control unit 130 is further configured to execute a control method of the DC/DC conversion circuit 100 provided in any embodiment of the present application, and specific details of the control method have been described in detail in the corresponding embodiment, and are not described herein again.
In an embodiment of the present application, fig. 6 schematically shows a circuit configuration diagram of a DC/DC conversion circuit provided in an embodiment of the present application.
As shown in fig. 6, the DC/DC conversion circuit includes a DC/AC conversion unit 610, a transformation unit 620, and an AC/DC conversion unit 630. The DC/AC conversion unit 610 includes a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4. The AC/DC conversion unit 630 includes a switch tube Q5, a switch tube Q6, a switch tube Q7 and a switch tube Q8. The transforming unit 620 includes an inductor L1, a capacitor C1, and a transformer T1.
The first end BUS + of the switch tube Q1 and the second end BUS-of the switch tube Q2 are used for being connected with a direct current BUS so as to be connected with first equipment through the direct current BUS. The second end of the switching tube Q1 is connected with the first end of the switching tube Q2; the first end of the switch tube Q3 is connected with the first end of the switch tube Q1, the second end of the switch tube Q4 is connected with the second end of the switch tube Q2, and the second end of the switch tube Q3 is connected with the first end of the switch tube Q4.
The first end BAT + of the switching tube Q7 and the second end BAT-of the switching tube Q8 are used for connecting the battery module, and the second end of the switching tube Q7 is connected with the first end of the switching tube Q8; the first end of the switch tube Q5 is connected to the first end of the switch tube Q7, the second end of the switch tube Q6 is connected to the second end of the switch tube Q8, and the second end of the switch tube Q5 is connected to the first end of the switch tube Q6.
One end of the inductor L1 is connected to the common connection end of the switching tube Q1 and the switching tube Q2, and the other end of the inductor L1 is connected to the first side of the transformer T1. One end of the capacitor C1 is connected with the common connecting end of the switch tube Q3 and the switch tube Q4, and the other end of the capacitor C1 is connected with the first side of the transformer T1. The second side of the transformer T1 is connected to the common connection terminals of the switching tubes Q5 and Q6, and the common connection terminals of the switching tubes Q7 and Q8, respectively.
The DC/AC conversion unit 610 and the AC/DC conversion unit 630 are both configured as a bridge inverter circuit, so that the DC/DC conversion circuit can convert the voltage of the DC bus and provide the converted voltage to the battery module, and can convert the voltage of the battery module and output the converted voltage to the DC bus, and then output the converted voltage to the first device through the DC bus for use.
When a discharging instruction is detected, a first detection signal is sent to the AC/DC conversion unit, that is, a first detection signal with a first duty ratio and a first frequency is sent to the control terminals of the switching tube Q5, the switching tube Q6, the switching tube Q7 and the switching tube Q8, so that the switching tube Q5, the switching tube Q6, the switching tube Q7 and the switching tube Q8 are turned on and off according to the first detection signal, and a voltage conversion operation is realized. The electric signal converted by the AC/DC conversion unit is output to the DC/AC conversion unit through the voltage transformation unit.
The voltage at the first terminal of the DC/AC conversion unit is then detected, i.e. the voltage between the first terminal BUS + of the switching tube Q1 and the second terminal BUS-of the switching tube Q2. When the voltage between the first end BUS + of the switch tube Q1 and the second end BUS-of the switch tube Q2 is detected to rise to a first preset voltage value within a first preset time period, a first control signal is generated according to the discharging instruction, the first control signal is sent to the AC/DC conversion unit and the DC/AC conversion unit, namely, the control signals are sent to the control ends of the switch tube Q1, the switch tube Q2, the switch tube Q3, the switch tube Q4, the switch tube Q5, the switch tube Q6, the switch tube Q7 and the switch tube Q8 respectively, so that the switch tubes are switched on and switched off according to the control signals, and the required power of the first device is output at the first end BUS + of the switch tube Q1 and the second end BUS-of the switch tube Q2.
When a charging instruction is detected, a second detection signal is sent to the DC/AC conversion unit, that is, a second detection signal with a second duty ratio and a second frequency is sent to the control terminals of the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4, so that the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are turned on and off according to the second detection signal, and a voltage conversion operation is realized. The electric signal converted by the AC/DC conversion unit is processed by the voltage transformation unit and the AC/DC conversion unit and then is output to the battery module for charging.
The voltage at the first terminal of the DC/AC conversion unit is then detected, i.e. the voltage between the first terminal BUS + of the switching tube Q1 and the second terminal BUS-of the switching tube Q2. When the voltage between the first end BUS + of the switching tube Q1 and the second end BUS-of the switching tube Q2 is detected to rise to a fourth preset voltage value within a second preset time period, a second control signal is generated according to the discharging instruction, the second control signal is sent to the AC/DC conversion unit and the DC/AC conversion unit, namely, the control signals are sent to the control ends of the switching tube Q1, the switching tube Q2, the switching tube Q3, the switching tube Q4, the switching tube Q5, the switching tube Q6, the switching tube Q7 and the switching tube Q8 respectively, so that the switching tubes are switched on and off according to the control signals, and electric signals are output to charge the battery module at the first end BAT + of the switching tube Q7 and the second end BAT-of the switching tube Q8.
Fig. 7 schematically illustrates a schematic diagram of a conversion apparatus provided in an embodiment of the present application. As shown in fig. 7, the converter 700 includes an AC/DC converter circuit 710 and a DC/DC converter circuit 720, and the DC/DC converter circuit 720 may be a DC/DC converter circuit provided in any embodiment of the present application. The AC/DC converter circuit 710 is connected as a first device to the DC/DC converter circuit 720 via a DC bus, and a bus capacitor C is connected in parallel to the DC bus. Wherein, the AC/DC converting circuit 710 may be a PFC circuit,
in one embodiment of the present application, the DC/DC converter circuit 720 is used to connect the battery module 300 and the AC/DC converter circuit 710 is used to connect the target device 400, which may be a power source or a powered device 400. When the AC/DC conversion circuit 710 is connected to the electric device, the DC/DC conversion circuit 720 may operate in a discharging mode, and the electric signal provided by the battery module 300 is processed by the DC/DC conversion circuit 720 and the AC/DC conversion circuit 710 to supply power to the electric device, so that when a discharging instruction is detected, it may be determined whether the DC/DC conversion circuit 720 has a short-circuit abnormality by sending a first detection signal to an AC/DC conversion unit in the DC/DC conversion circuit 720 and detecting a voltage at a first terminal of the DC/AC conversion unit.
When the AC/DC conversion circuit 710 is connected to a power source, the DC/DC conversion circuit 720 may operate in a charging mode, and an electrical signal provided by the power source is processed by the AC/DC conversion circuit 710 and the DC/DC conversion circuit 720 and then output to the battery module 300 for charging, when a charging instruction is detected, it may be determined whether there is a short-circuit abnormality in the DC/DC conversion circuit 720 by sending a second detection signal to the DC/AC conversion unit in the DC/DC conversion circuit 720 and detecting a voltage at a first end of the DC/AC conversion unit.
In an embodiment of the present application, as shown in fig. 8, the converter 700 further includes a controller 730, the ac/DC converter circuit 710 and the DC/DC converter circuit 720 may share the same controller 730, and the controller 730 may implement the control method of the DC/DC converter circuit 720 provided in any embodiment of the present application.
The application also provides an electronic device which can comprise the conversion circuit provided by any embodiment of the application, for example, the electronic device is a power conversion device.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A control method of a DC/DC conversion circuit is characterized in that the DC/DC conversion circuit comprises a DC/AC conversion unit, a transformation unit and an AC/DC conversion unit, wherein a first end of the DC/AC conversion unit is used for being connected with a first device, a second end of the DC/AC conversion unit is connected with a first end of the transformation unit, a first end of the AC/DC conversion unit is connected with a second end of the transformation unit, and a second end of the AC/DC conversion unit is used for being connected with a battery module; the control method comprises the following steps:
when a discharging instruction is detected, sending a first detection signal to the AC/DC conversion unit, wherein the first detection signal is used for indicating the AC/DC conversion unit to convert the electric signal output by the battery module according to a first duty ratio and a first frequency, and the electric signal converted by the AC/DC conversion unit is output to the DC/AC conversion unit through the voltage transformation unit;
when it is detected that the voltage of the first end of the DC/AC conversion unit rises to a first preset voltage value within a first preset time period, generating a first control signal according to the discharge instruction, and sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit, wherein the first control signal is used for controlling the DC/DC conversion circuit to output the required power of the first device;
when the voltage of the first end of the DC/AC conversion unit is lower than a second preset voltage value within the first preset time period, determining that the DC/AC conversion unit has short circuit abnormality, and not responding to the discharge instruction, wherein the second preset voltage value is smaller than the first preset voltage value.
2. The method of claim 1, wherein after sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit, further comprising:
and when the voltage of the first end of the DC/AC conversion unit is detected to be reduced to a third preset voltage value, stopping sending the first control signal.
3. The method of controlling a DC/DC converter circuit according to claim 1, further comprising, after the non-responding to the discharge instruction:
adding one to the abnormal statistics times;
and when the abnormal counting times reach the preset counting times, not responding to the operation of the DC/DC conversion circuit.
4. The method of claim 1, wherein the generating a first control signal according to the discharge instruction comprises:
acquiring the required power of the first equipment;
acquiring the discharge power of the battery module;
and generating the first control signal according to the required power of the first device and the discharge power of the battery module.
5. The control method of the DC/DC conversion circuit according to claim 1, characterized in that the control method further comprises;
when a charging instruction is detected, sending a second detection signal to the DC/AC conversion unit, where the second detection signal is used to instruct the DC/AC conversion unit to convert the electrical signal output by the first device according to a second duty cycle and a second frequency, and the electrical signal converted by the DC/AC conversion unit is output to the AC/DC conversion unit through the voltage transformation unit;
when it is detected that the voltage of the first end of the DC/AC conversion unit rises to a fourth preset voltage value within a second preset time period, generating a second control signal according to the charging instruction, and sending the second control signal to the DC/AC conversion unit and the AC/DC conversion unit, wherein the second control signal is used for controlling the DC/DC conversion circuit to convert an electric signal output by the first device and then output the electric signal to the battery module for charging;
when the voltage of the first end of the DC/AC conversion unit is detected to be reduced to a fifth preset voltage value within a second preset time period, the DC/AC conversion unit is determined to have short circuit abnormality, the discharge instruction is not responded, and the fourth preset voltage value is larger than the fifth preset voltage value.
6. The method of claim 5, wherein after sending the second control signal to the DC/AC converting unit and the AC/DC converting unit, the method further comprises:
and when the voltage of the first end of the DC/AC conversion unit is detected to be reduced to a sixth preset voltage value, stopping sending the second control signal.
7. The method of controlling a DC/DC conversion circuit according to claim 5, wherein the first duty ratio is smaller than the second duty ratio, and the first frequency is smaller than the second frequency.
8. A DC/DC conversion circuit is characterized by comprising a DC/AC conversion unit, a transformation unit, an AC/DC conversion unit and a control unit, wherein a first end of the DC/AC conversion unit is used for being connected with a first device, a second end of the DC/AC conversion unit is connected with a first end of the transformation unit, a first end of the AC/DC conversion unit is connected with a second end of the transformation unit, and a second end of the AC/DC conversion unit is used for being connected with a battery module; the control unit is used for executing:
when a discharging instruction is detected, sending a first detection signal to the AC/DC conversion unit, wherein the first detection signal is used for indicating the AC/DC conversion unit to convert the electric signal output by the battery module according to a first duty ratio and a first frequency, and the electric signal converted by the AC/DC conversion unit is output to the DC/AC conversion unit through the voltage transformation unit;
when it is detected that the voltage of the first end of the DC/AC conversion unit rises to a first preset voltage value within a first preset time period, generating a first control signal according to the discharge instruction, and sending the first control signal to the AC/DC conversion unit and the DC/AC conversion unit, wherein the first control signal is used for controlling the DC/DC conversion circuit to output the required power of the first device;
when the voltage of the first end of the DC/AC conversion unit is lower than a second preset voltage value within the first preset time period, determining that the DC/AC conversion unit has short circuit abnormality, and not responding to the discharge instruction, wherein the second preset voltage value is smaller than the first preset voltage value.
9. A conversion apparatus, characterized in that the conversion apparatus comprises an AC/DC conversion circuit and the DC/DC conversion circuit according to claim 8;
the AC/DC conversion circuit is connected with the DC/DC conversion circuit through a bus capacitor as the first device.
10. An electronic device, characterized in that it comprises a conversion circuit as claimed in claim 9.
CN202211309220.3A 2022-10-25 2022-10-25 DC/DC conversion circuit, control method thereof, conversion device and electronic equipment Pending CN115566906A (en)

Priority Applications (1)

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CN202211309220.3A CN115566906A (en) 2022-10-25 2022-10-25 DC/DC conversion circuit, control method thereof, conversion device and electronic equipment

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Application Number Priority Date Filing Date Title
CN202211309220.3A CN115566906A (en) 2022-10-25 2022-10-25 DC/DC conversion circuit, control method thereof, conversion device and electronic equipment

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CN115566906A true CN115566906A (en) 2023-01-03

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