WO2018036266A1

WO2018036266A1 - Dc-dc converter and multi-operating mode implementation method therefor

Info

Publication number: WO2018036266A1
Application number: PCT/CN2017/090371
Authority: WO
Inventors: 齐京
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-08-22
Filing date: 2017-06-27
Publication date: 2018-03-01
Also published as: CN107769546A

Abstract

A DC-DC converter and a multi-operating mode implementation method therefor, the method comprising: detecting voltages of an input terminal (301) and an output terminal (302) of a DC-DC converter, and generating an operation mode control signal according to the detection result (S101); according to the operation mode control signal, controlling the statuses of a forward switch circuit (303) and a reverse switch circuit (304) (S102); the forward switch circuit (303) and the reverse switch circuit (304) are arranged in parallel connection between the input terminal (301) and the output terminal (302) of the DC-DC converter. The present invention enables two-way conduction of the DC-DC converter, thus facilitating the miniaturization of a product.

Description

DC to DC converter and its multiple working mode implementation method

Technical field

This document relates to, but is not limited to, the DCDC (Direct Current-Direct Current) field, and in particular to a DC-to-DC converter and a multi-operation mode implementation method thereof.

Background technique

With the development of electronic technology, the application of DC to DC converter in the circuit has become more and more extensive. The design method of DC to DC circuit is relatively fixed, generally including input circuit, power tube, control circuit, output circuit and feedback circuit. Negative temperature coefficient (Negative Temperature Coefficient, NTC) temperature protection circuit, DC to DC converter. Manufacturers generally integrate the power tube, control circuit, output circuit, feedback circuit, NTC temperature protection circuit, etc. inside the chip, and the input circuit and output circuit are manually built. The DC to DC converters currently used in the products are unidirectional. For example, a diode is added to the output circuit of the DC to DC converter, and the output portion of the DC to DC converter is prevented from being poured into the input portion. Therefore, when a DC-to-DC converter product requires input and output in two directions, two DC-to-DC converters are used. For example, the charging treasure is provided with two DC-DC converters, one of which is used as an output of an external terminal. The other way is the input of the charging treasure. This will increase the cost of the meeting and is not conducive to the miniaturization of the product.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

Embodiments of the present invention provide a DC-to-DC converter and a multi-operation mode implementation method thereof, which can realize a DC-DC converter bi-directional conduction, which is advantageous for miniaturization of products.

An embodiment of the present invention provides a method for implementing a multi-operation mode of a DC-to-DC converter, where the DC-DC converter includes a forward switching circuit and a reverse switching circuit disposed in parallel between the input end and the output end, When the forward switching circuit is turned on, the DC to DC converter current is from The input end flows to the output end, and when the reverse switch circuit is turned on, the DC to DC converter current flows from the output end to the input end;

The method includes:

Detecting a voltage of the input end and the output end, and generating an operation mode control signal according to the detection result;

The states of the forward switching circuit and the reverse switching circuit are controlled according to the operating mode control signal.

The embodiment of the invention further provides a multi-operation mode DC-to-DC converter, comprising a forward switching circuit and a reverse switching circuit connected in parallel between the input end and the output end of the DC-to-DC converter, the forward switching circuit When turned on, the DC to DC converter current flows from the input terminal to the output terminal, and when the reverse switch circuit is turned on, the DC to DC converter current flows from the output terminal to the input terminal end;

a voltage detecting circuit and a mode control circuit;

The voltage detecting circuit is connected to the input end and the output end, and is configured to detect a voltage of the input end and the output end, and generate an operation mode control signal according to the detection result and output the signal to the mode control circuit;

The mode control circuit is configured to control states of the forward switching circuit and the reverse switching circuit according to the input operating mode control signal.

The beneficial effects of the embodiments of the present invention are:

According to an embodiment of the present invention, a DC-to-DC converter and a multi-operation mode implementation method thereof are provided with a parallel forward switching circuit and a reverse switching circuit, and a forward switching switch between an input end and an output end of a DC-to-DC converter. When the circuit is turned on, the DC-to-DC converter current flows from the input end to the output end, that is, the forward working mode is processed; when the reverse switch circuit is turned on, the DC-to-DC converter current flows from the output end to the input end, that is, processing Positive working mode. The embodiment of the invention detects the voltage of the input end and the output end of the DC-DC converter, and generates a corresponding working mode control signal according to the detection result, and then the working mode control signal controls the states of the forward switching circuit and the reverse switching circuit, The DC to DC converter is operated in the corresponding working mode. Therefore, the DC-to-DC converter provided by the embodiment of the present invention can support the forward working mode and the reverse working mode by double-conducting. formula. Therefore, for a scenario requiring dual-conduction, only one DC-to-DC converter is needed, and the unidirectional DC-to-DC can reduce the cost and improve the integration of the product, which is more conducive to product miniaturization.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of a control flow of a working mode of a DC-to-DC converter according to Embodiment 1 of the present invention;

2 is a schematic flow chart of a method for implementing a multi-working mode of a DC-to-DC converter according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of a multi-operation mode DC-to-DC converter according to Embodiment 2 of the present invention;

4 is a schematic structural diagram of another multi-mode DC-DC converter according to Embodiment 2 of the present invention;

5 is a schematic structural diagram of a multi-operation mode DC-to-DC converter according to Embodiment 3 of the present invention;

6 is a schematic structural diagram of a voltage detecting circuit according to Embodiment 3 of the present invention;

7 is a schematic structural diagram of a mode control circuit according to Embodiment 3 of the present invention;

FIG. 8 is a schematic structural diagram of a voltage control circuit according to Embodiment 3 of the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1:

This embodiment discloses a DC-to-DC converter with multiple operating modes, which can also be called a bidirectional DC-to-DC converter. The bidirectional DC-to-DC converter supports a forward working mode (current flow from DC to DC conversion) Input to output) and reverse mode of operation (current flow from DC Turn DC output to input) two operating modes. In this embodiment, the DC-DC controller can be controlled to operate in a forward working mode or a reverse working mode according to the voltage conditions of the input and output terminals of the DC-to-DC converter. This embodiment illustrates an example of a multi-operation mode implementation method of a DC-to-DC converter.

The DC-to-DC converter in this embodiment includes a forward switching circuit and a reverse switching circuit arranged in parallel between the input end and the output end, the forward switching circuit is turned on, and the reverse switching circuit is turned off, the DC-DC is turned on. The converter current flows from the input terminal to the output terminal, and is in the forward working mode; when the reverse switching circuit is turned on and the forward switching circuit is turned off, the DC-to-DC converter current flows from the output terminal to the input terminal, and is in the reverse working mode. See Figure 1 for the control process of the DC to DC converter operating mode, including:

S101: detecting a voltage of an input end and an output end of the DC to DC converter, and generating an operation mode control signal according to the detection result;

S102: Control the state of the forward switching circuit and the reverse switching circuit of the DC to DC converter according to the obtained working mode control signal, thereby implementing control of the working mode of the DC to DC converter.

In this embodiment, generating the working mode control signal according to the detection result of the input terminal and the output terminal voltage includes:

When detecting that the input terminal changes from low level to high level and the output terminal is low level (when the DC to DC converter is powered up), a forward mode control signal is generated;

When the input terminal is detected as a low level and the output terminal changes from a low level to a high level (the DC-to-DC converter is powered up in reverse), a reverse mode control signal is generated.

Correspondingly, controlling the states of the forward switching circuit and the reverse switching circuit according to the working mode control signal includes:

When the generated working mode control signal is the forward mode control signal, the control forward switching circuit is turned on, and the reverse switching circuit is turned off to enter the forward working mode, and the current flow at this time flows from the input end to the output end.

When the generated working mode control signal is the reverse mode control signal, the control forward switching circuit is turned off, the reverse switching circuit is turned on to enter the reverse working mode, and the current flows to the output terminal. Flow to the input.

In this embodiment, generating the working mode control signal according to the detection result of the input terminal and the output terminal voltage further includes:

It is detected that the input terminal is high level, and the output terminal changes from high level to low level (that is, from the power-on state to the output terminal first power-down state), or the input terminal changes from a high level to a low level. When the output is high (that is, from the power-on state to the input power-down state), a hold mode control signal is generated.

At this time, controlling the states of the forward switching circuit and the reverse switching circuit according to the working mode control signal further includes:

When the generated operating mode control signal is the hold mode control signal, the forward switching circuit and the reverse switching circuit are controlled to maintain the current on and off states. That is, when it is detected that both the input end and the output end are in a high state, and at the next moment, one end becomes a low level, it indicates that the end is lower than the other end, but it cannot be determined that the current is positive. The working mode is also the reverse working mode, because it may only be a transition phase of power-off, for example, the level at both ends may become low at the next moment. Therefore, the present embodiment can avoid erroneous judgment in the power-off phase and cause erroneous control on the working mode of the DC-DC converter through the above control process.

In this embodiment, generating the working mode control signal according to the detection result of the input terminal and the output terminal voltage may further include:

When it is detected that the input and output of the DC-to-DC converter are both low, no control signal can be generated at this time; of course, an idle mode control signal can also be generated. At this time, controlling the states of the forward switching circuit and the reverse switching circuit according to the obtained idle mode control signal may include: controlling the on/off states of the forward switching circuit and the reverse switching circuit to be initial states. In theory, the forward switching circuit and the reverse switching circuit can be in any state of being turned on or off at this time, so the DC to DC converter is not powered at this time, that is, it is not in the working state. However, resetting the on and off states of the forward switching circuit and the reverse switching circuit in this embodiment can better prepare for subsequent startup, and is more conducive to control.

In this embodiment, after the DC-DC converter enters the forward working mode or the reverse working mode, the stabilization process of the output voltage can be further controlled to improve the stability of the DC-DC converter operation. Therefore, a power adjustment circuit may be disposed between the input end and the output end of the DC-to-DC converter in this embodiment; when the DC-to-DC converter enters a working mode, The output power of the power adjustment circuit is adjusted according to the comparison result of the output voltage in the current operating mode of the DC-to-DC converter and the reference voltage of the operating mode so that the output voltage in the current operating mode remains stable.

Correspondingly, when it is detected that the input and output of the DC-to-DC converter are both low, the DC-to-DC converter is not powered, that is, it is not in the working state, so the power adjustment circuit can be used at this time. Do not make any control.

In this embodiment, different power adjustment circuits may be used to adjust the output voltage for different working modes, or the power adjustment circuit may be fully or partially shared for adjustment. I will not repeat them here.

For a better understanding of the embodiments of the present invention, the embodiments of the present invention are exemplified below in conjunction with a complete multi-work mode control process. See Figure 2, including:

S201: collecting voltages at the input end and the output end of the DC to DC converter;

S202: determining whether the voltages at both ends are low level, if yes, go to S209, if not, go to S203;

S203: determining whether the input terminal voltage is greater than the output terminal voltage, if yes, go to S204; if not, go to S205;

S204: control the forward switch circuit is turned on, the reverse switch circuit is turned off, that is, the forward working mode is turned on, and the process goes to S206;

S205: control the forward switch circuit is disconnected, the reverse switch circuit is turned on, that is, the reverse operation mode is turned on, and the process proceeds to S206;

S206: Adjust a power adjustment circuit according to an output voltage of the current working mode and a corresponding reference voltage to adjust an output voltage of the current working mode;

S207: detecting that one end of the output end and the input end is powered down;

S208: Determine whether both ends are low level, if yes, go to S209, if no, go to S206.

S209: DC to DC is in idle mode and ends.

It can be seen that the bidirectional DC-to-DC converter in this embodiment supports the forward working mode (current flow from the input to the output of the DC to DC converter) and the reverse working mode (the current flows from the direct current to the direct current) Stream output to input) two modes of operation. The relatively unidirectional DC-to-DC converter can reduce costs and increase product integration and miniaturization.

Embodiment 2:

Referring to FIG. 3, the embodiment provides a multi-operation mode DC-to-DC converter, including a forward switching circuit 303 and a reverse switch connected in parallel between the input terminal 301 and the output terminal 302 of the DC-to-DC converter. In circuit 304, when the forward switching circuit 303 is turned on, the DC to DC converter current flows from the input terminal 301 to the output terminal 302, and when the reverse switching circuit 304 is turned on, the DC to DC converter current flows from the output terminal 302 to the input. End 301. It should be understood that the specific implementation manner of the switch circuit in this embodiment may be any switch circuit that can achieve communication and disconnection for a certain circuit. Wherein, the DC to DC converter may further include a voltage detection circuit 306 and a mode control circuit 305;

The voltage detecting circuit 306 is arranged to detect the voltage of the input terminal 301 and the output terminal 302, according to the detection result generated operating mode control signal is sent to the mode control circuit 305;

The mode control circuit 305 is arranged to control the states of the forward switching circuit 303 and the reverse switching circuit 304 in accordance with the operating mode control signal, thereby implementing control of the operating mode of the DC to DC converter.

In this embodiment, the voltage detecting circuit 306 is configured to generate an operating mode control signal according to the detection result of the voltages of the input terminal 301 and the output terminal 302 by:

When it is detected that the input terminal 301 changes from a low level to a high level and the output terminal 302 is at a low level (in the case where the DC-to-DC converter is powered up), a forward mode control signal is generated;

Detecting that the input terminal 301 is at a low level, and when the output terminal 302 is changed from a low level to a high level (in the case where the DC-to-DC converter is powered up in reverse), a reverse mode control signal is generated;

Correspondingly, the mode control circuit 305 is configured to control the states of the forward switching circuit 303 and the reverse switching circuit 304 according to the operating mode control signal by:

When the generated working mode control signal is the forward mode control signal, the control forward switching circuit 303 is turned on, and the reverse switching circuit 304 is turned off to enter the forward working mode. At this time, the current flows from the input terminal 301 to the output terminal 302. .

Controlling the forward switching circuit when the generated operating mode control signal is a reverse mode control signal The switch 303 is turned off and the reverse switch circuit 304 is turned on to enter the reverse mode of operation. The current flow at this time flows from the input terminal 301 to the output terminal 302.

In this embodiment, the voltage detecting circuit 306 is further configured to generate an operating mode control signal according to the detection results of the voltages of the input terminal 301 and the output terminal 302 by:

It is detected that the input terminal 301 is at a high level, and the output terminal 302 is changed from a high level to a low level (that is, from a power-on state to a power-off state at the output terminal 302), or the input terminal 301 is changed from a high level to a low level. When the output terminal 302 is at a high level (that is, from the power-on state to the input terminal 301 first power-down state), a hold mode control signal is generated.

At this time, the mode control circuit 305 is further configured to control the states of the forward switching circuit 303 and the reverse switching circuit 304 according to the operating mode control signal by:

When the generated operational mode control signal is the hold mode control signal, the forward switching circuit 303 and the reverse switching circuit 304 are controlled to maintain the current on and off states. That is, when it is detected that both the input terminal 301 and the output terminal 302 are in a high state, and at one of the next moments, one end becomes a low level, it indicates that the terminal is powered off faster than the other end, but it cannot be determined that the time is The forward working mode is also the reverse working mode, because it may only be a transition phase of power-off, for example, the level at both ends may become low at the next moment. Therefore, the mode control circuit of the embodiment can avoid erroneous determination in the power-off phase and cause erroneous control on the working mode of the DC-DC converter through the above control process.

When it is detected that the DC-DC converter input terminal 301 and the output terminal 302 are both at a low level, no control signal can be generated at this time; of course, an idle mode control signal can also be generated. At this time, the mode control circuit 305 is configured to control the states of the forward switching circuit 303 and the reverse switching circuit 304 according to the obtained idle mode control signal by controlling the forward switching circuit 303 and the reverse switching circuit 304. The on and off states are initial states. In this embodiment, resetting the on/off states of the forward switching circuit 303 and the reverse switching circuit 304 can better prepare for subsequent startup, and is more conducive to control.

In this embodiment, after the DC-DC converter enters the forward working mode or the reverse working mode, the stabilization process of the output voltage can be further controlled to improve the stability of the DC-DC converter operation. Therefore, as shown in FIG. 4, the DC-to-DC converter in this embodiment A power adjustment circuit 308 is further disposed between the input terminal 301 and the output terminal 302. The voltage control circuit 307 is further included, and is configured to output according to the current working mode of the DC to DC converter after the DC to DC converter enters a certain working mode. The result of the comparison of the voltage and the reference voltage of the operating mode adjusts the output power of the power conditioning circuit 308 such that the output voltage in the current operating mode remains stable. The voltage control circuit 307 in this embodiment may specifically determine the current working mode of the DC to DC converter according to the operating mode control signal output by the voltage detecting circuit, for example, when the working mode control signal is a forward mode control signal, indicating DC to DC. The converter is currently in the forward mode control signal; when the operating mode control signal is the reverse mode control signal, it indicates that the DC to DC converter is currently in the reverse mode control signal; when the operating mode control signal is the hold mode control signal, indicating The DC-to-DC converter is currently in the working mode determined at the previous moment; when the working mode control signal is the idle mode control signal, it indicates that the DC-to-DC converter is not currently working, and the voltage control circuit 307 can be in the disabled state at this time. There is no need to adjust the power adjustment circuit 308.

In this embodiment, different power adjustment circuits 308 may be used to adjust the output voltage for different operation modes, or the power adjustment circuit 308 may be fully or partially shared. I will not repeat them here.

Embodiment 3:

For a better understanding of the embodiments of the present invention, the embodiments of the present invention are further illustrated in conjunction with a specific DC to DC converter structure block diagram.

Referring to FIG. 5, the bidirectional DC-to-DC converter comprises a voltage detecting circuit, a mode control circuit, a voltage control circuit, an energy storage device, three power tubes and two switches, wherein the first switch is a forward switch. In the circuit diagram, the second switch is the reverse switch circuit. In Fig. 5, the thin arrow line represents the control signal, and the thick arrow line represents the power signal. An initial mode setting circuit can also be provided, which is set to connect an external input signal of DC to DC for setting an initial state for DC to DC, and can be externally connected to a high level or a low level input. Based on the DC-to-DC converter shown in Figure 5, the operating mode control process is as follows:

The voltage detecting circuit is configured to detect the working state of the DC-DC converter according to the relationship between the DC-to-DC input terminal and the output terminal voltage.

The mode control circuit is set to intelligently switch DC according to the state detected by the input end and the output end. The DC-DC converter operates in an idle state, a forward operating mode, or a reverse operating mode or maintains the current operating mode.

The voltage control circuit is arranged to adjust the power tube according to the working state of the DC to DC converter, so that the output level can be relatively stable regardless of whether the DC to DC converter is in the forward working mode or the reverse working mode.

When the DC-to-DC converter changes from the forward working mode or the reverse working mode to the idle state, the power-off process of the DC-to-DC converter is corresponding to the DC-DC converter input and output level during the power-down process. When one becomes low, the control DC-DC converter operating mode remains in the current operating mode. When the input and output of the DC-to-DC converter are both low, the DC-DC converter is controlled to be in an idle state, and the voltage control circuit can be in an un-enabled state.

The specific implementation manner of the voltage detecting circuit in this embodiment may be various, as long as it can realize the detection of two voltages and can realize the control signals of various working mode control corresponding to the two voltage outputs. The following is a description of a specific voltage detection circuit implementation structure as an example.

Referring to an embodiment of the voltage detecting circuit shown in FIG. 6, which includes an analog-to-digital conversion module, an OR gate, an AND gate, a counter, and a comparison circuit connected to an output of the analog-to-digital conversion module, wherein an AND gate output and a counter The output is connected to the enable end of the comparison circuit, the output of the comparison circuit is connected to the bistable save circuit, and the output of the bistable save circuit is connected to the input of the voltage control circuit and the mode control circuit in FIG. The output is connected to the enable terminal of the voltage control circuit. The counter can use a 1-bit falling edge counter.

See the relationship between the high-low level relationship between the input and output of the DC-to-DC converter and the corresponding control signals as shown in Table 1 below.

Table 1

输入端电平Input level	输出端电平Output level	工作模式控制信号Working mode control signal
00	00	空闲模式控制信号Idle mode control signal
00	11	反向模式控制信号Reverse mode control signal
11	00	正向模式控制信号Forward mode control signal
11	11	保持模式控制信号Hold mode control signal

Based on the corresponding relationship in Figure 5, Figure 6, and Table 1, the voltage detection circuit is divided into the following kinds of work. Happening:

When the input end and the output end of the DC-to-DC converter are both low level, the AND gate outputs a low level, the comparison circuit is in an enabled state, that is, in a working state, or the gate outputs a low level interrupt to the voltage control circuit, so that the voltage The control circuit is in a non-enabled state, and the voltage control circuit controls the DC to DC converter to be in an idle state.

When the DC-to-DC converter is powered on, it will detect that at least one of the input terminal and the output terminal is at a high level, the AND gate outputs a low level, and the 1-bit falling edge counter counts 0, and the comparison circuit is enabled to operate; the comparison circuit According to the size of the input and output signal levels, a high-level or low-level output is written to the bistable storage circuit to output a corresponding 10 or 01 control signal to the mode control circuit, and then the DC-DC conversion is controlled by the mode control circuit. The device is in the forward working mode or the reverse working mode, and the voltage control circuit is controlled to adjust the power tube.

When the input and output of the DC-to-DC converter are both high, the AND gate outputs a high level, the comparison circuit is in the non-enable off state, the 1-bit falling edge counter counts 0, and the output of the bistable save circuit remains unchanged. , thereby controlling the DC-DC controller to maintain the previous operating mode.

When the DC-to-DC converter is powered down, at least one of the input and output terminals will go low first, the 1-bit falling edge counter will count 1, and the comparison circuit will be in the non-enable off state. The output of the bistable save circuit will remain unchanged. Therefore, the DC-DC converter is controlled to maintain the previous working mode. When the input and output both go low, the 1-bit falling edge counter counts 0, the comparison circuit is in the enabled working state, and the output table of the bistable storage circuit is In the 00 control signal, the voltage control circuit controls the DC to DC converter to be in idle mode.

7 is an embodiment of a mode control circuit, which uses an inverter control circuit, and the input end is connected to the control signal output end of the voltage detecting circuit, and controls the on and off states of the first switch and the second switch according to the control signal. For example, when the DC-DC converter is in the forward working mode, the first switch is controlled to be in a connected state, and the second switch is in a closed state; when the DC-to-DC converter is in a reverse working mode, the first switch is controlled to be in a closed state, The second switch is in a connected state. However, it should be understood that the inverter control is merely an example of realizing control of the first switch and the second switch, and the mode control circuit is not limited to the configuration shown in FIG.

8 is an embodiment of a voltage control circuit. The voltage control circuit is mainly composed of a forward mode comparator and a reverse mode comparator. The input in FIG. 8 is an output in a reverse mode of operation. The input is in reverse working mode.

When the DC-DC converter is in the forward working mode, the voltage control circuit controls the third power tube to be in a closed state, and adjusts the conduction and closing of the first power tube and the second power tube in real time according to the output voltage of the forward working mode. The output voltage is relatively stable; when the DC-DC is in the reverse working mode, the voltage control circuit controls the second power tube to be in a closed state, and adjusts the first power tube and the third power tube in real time according to the output voltage of the reverse working mode. The turn-on is turned off, so that the output voltage is relatively stable.

The initial mode setting circuit in FIG. 5 is set to set an initial state for the operation mode of the DC to DC converter, and can be implemented by a weak pull-up or a weak pull-down inside the DC-DC converter, or can be externally configured.

The DC-DC converter structure described in the above embodiment is not limited to the configuration shown in the above figures. The DC-to-DC converter of FIG. 5 includes a voltage detecting circuit, a mode control circuit, a voltage control circuit, an energy storage device, a power tube, and a switch. The mode control circuit can also be composed of a one-way control two-way switch or two diode branches including forward and reverse. The voltage control circuit can also be realized by a programmable single-chip controller, and the energy storage device can also be placed in a DC-to-DC converter. external.

The bidirectional DC-to-DC converter provided by the embodiment of the invention comprises a forward working (from the input of the DC to DC converter to the output of the DC to DC converter) and a reverse operation (from the output of the DC to DC converter to the DC converter) The input mode of the DC converter) can reduce the number of DC to DC converters used in both the forward operation and the reverse operation mode. According to the change of the input and output of the DC-to-DC converter during power-on and power-down, the voltage detection circuit can automatically identify the working state of the DC-to-DC converter and prevent the bidirectional DC-DC converter from being powered down. An error occurred during the process to improve the reliability of the use of the bidirectional DC to DC converter.

The above is a detailed description of the embodiments of the present invention in conjunction with the specific embodiments, and the specific embodiments of the present invention are not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Industrial applicability

The DC-to-DC converter in the above technical solution includes two working modes of forward working and reverse working, and can reduce the number of DC to DC converters in the use scenario including both forward working and reverse working modes. Relatively unidirectional DC-to-DC converters can reduce costs and increase product integration and miniaturization.

Claims

A multi-working mode implementation method for a DC-to-DC converter, comprising:

Detecting the voltage of the input end and the output end of the DC to DC converter, and generating an operation mode control signal according to the detection result (S101);

Controlling, by the operating mode control signal, a state of a forward switching circuit and a reverse switching circuit; the forward switching circuit and the reverse switching circuit are disposed in parallel between the input end and the output end of the DC to DC converter (S102).
The multi-operation mode implementation method of the DC-to-DC converter according to claim 1, wherein the generating the operation mode control signal according to the detection result comprises:

Detecting that the input terminal changes from a low level to a high level, and when the output terminal is at a low level, generating a forward mode control signal;

Detecting that the input terminal is low level, and when the output terminal changes from low level to high level, generating a reverse mode control signal;

Controlling the states of the forward switching circuit and the reverse switching circuit according to the operating mode control signal includes:

When the working mode control signal is a forward mode control signal, the forward switch circuit is controlled to be turned on, and the reverse switch circuit is turned off to enter a forward working mode;

When the operating mode control signal is a reverse mode control signal, the forward switching circuit is controlled to be turned off, and the reverse switching circuit is turned on to enter a reverse operating mode.
The method for implementing the multi-operation mode of the DC-to-DC converter of claim 2, the generating the operating mode control signal according to the detection result further includes:

It is detected that the input terminal is at a high level, the output terminal changes from a high level to a low level, or the input terminal changes from a high level to a low level, and when the output terminal is at a high level, a hold mode control signal is generated. ;

Controlling the states of the forward switching circuit and the reverse switching circuit according to the operating mode control signal further includes:

When the operating mode control signal is a hold mode control signal, the forward switching circuit and the reverse switching circuit are controlled to maintain a current on and off state.
The multi-operation mode implementation method of the DC-to-DC converter according to claim 2 or 3, wherein the generating the operation mode control signal according to the detection result further comprises:

An idle mode control signal is generated when both the input end and the output end are detected to be low level;

Controlling the states of the forward switching circuit and the reverse switching circuit according to the operating mode control signal further includes:

When the operation mode control signal is an idle mode control signal, the on/off states of the forward switching circuit and the reverse switching circuit are controlled to be initial states.
The method for implementing a multi-operation mode of a DC-to-DC converter according to claim 2 or 3, further comprising:

Adjusting the output power of the power adjustment circuit according to a comparison result of the output voltage of the DC-DC converter in the current working mode and the reference voltage of the working mode to keep the output voltage in the current operating mode stable; the power adjustment circuit And disposed between the input end and the output end of the DC to DC converter.
A DC to DC converter comprising:

a forward switching circuit (303) and a reverse switching circuit (304) connected in parallel between the input terminal (301) and the output terminal (302) of the DC to DC converter, when the forward switching circuit (303) is turned on The DC to DC converter current flows from the input terminal (301) to the output terminal (302), and when the reverse switching circuit (304) is turned on, the DC to DC converter current flows from the The output end (302) flows to the input end (301);

Voltage detection circuit (306) and mode control circuit (305);

The voltage detecting circuit (306) is connected to the input terminal (301) and the output terminal (302), and is configured to detect voltages of the input terminal (301) and the output terminal (302) according to the detection result. Generating a working mode control signal output to the mode control circuit (305);

The mode control circuit (305) is configured to control states of the forward switching circuit (303) and the reverse switching circuit (304) according to the input operating mode control signal.
A DC to DC converter according to claim 6, wherein said voltage detecting circuit (306) is arranged to generate an operating mode control signal based on the detection result by:

It is detected that the input terminal (301) changes from a low level to a high level, and the output terminal (302) is low. Normally, a forward mode control signal is generated;

Detecting that the input terminal (301) is at a low level, and when the output terminal (302) is changed from a low level to a high level, generating a reverse mode control signal;

The mode control circuit (305) is configured to control the states of the forward switching circuit (303) and the reverse switching circuit (304) according to the operating mode control signal by:

When the working mode control signal is a forward mode control signal, the forward switching circuit (303) is controlled to be turned on, and the reverse switching circuit (304) is turned off to enter a forward working mode;

When the operating mode control signal is a reverse mode control signal, the forward switching circuit (303) is controlled to be turned off, and the reverse switching circuit (304) is turned on to enter a reverse operating mode.
A multi-operation mode DC-to-DC converter according to claim 7, wherein said voltage detecting circuit (306) is further configured to detect a voltage of said input terminal (301) and said output terminal (302) by: Generate a working mode control signal based on the detection result:

Detecting that the input terminal (301) is at a high level, the output terminal (302) is changed from a high level to a low level, or the input terminal (301) is changed from a high level to a low level, and the output end ( 302) when the level is high, generating a hold mode control signal;

The mode control circuit (305) is further configured to control the states of the forward switching circuit (303) and the reverse switching circuit (304) according to the operating mode control signal by:

When the operation mode control signal is the hold mode control signal, the forward switch circuit (303) and the reverse switch circuit (304) are controlled to maintain the current on and off states.
The multi-operation mode DC-to-DC converter according to claim 7 or 8, wherein the voltage detecting circuit (306) is further configured to detect the input terminal (301) and the output terminal (302) by: The voltage, according to the detection result, generates a working mode control signal:

When it is detected that both the input end (301) and the output end (302) are low level, an idle mode control signal is generated;

The mode control circuit (305) is further configured to implement a state of the forward switching circuit (303) and the reverse switching circuit (304) according to the operating mode control signal by: control:

When the operation mode control signal is an idle mode control signal, the on/off states of the forward switching circuit (303) and the reverse switching circuit (304) are controlled to be initial states.
A multi-operation mode DC-to-DC converter according to claim 7 or 8, further comprising a voltage control circuit (307), and a power adjustment circuit connected between said input terminal (301) and said output terminal (302) ( 308);

The voltage control circuit (307) is configured to adjust an output power of the power adjustment circuit (308) according to a comparison result of an output voltage in a current operating mode and a reference voltage of the operating mode such that an output voltage in a current operating mode keep it steady.