TWI828131B - Bidirectional modulation method of current-fed isolated DC-DC converter - Google Patents

Abstract

A bidirectional modulation method for a current-fed isolated DC-to-DC converter, wherein the bidirectional modulation method includes the following steps: (a) controlling the clamping circuit and the power transmission circuit by using complex switching signals to obtain the complex Voltage information, and perform a leading component comparison on the plurality of voltage information to obtain the plurality of leading comparison information, (b) perform a state mode judgment on the plurality of leading comparison information and an output status information to obtain the plurality of transmission mode, (c) when the complex transmission mode is a boost mode, a low voltage terminal of the current input terminal is transmitted to a high voltage terminal of the voltage input terminal; when the complex transmission mode is a buck mode, the voltage terminal of the voltage input terminal The high-voltage terminal is transmitted to the low-voltage terminal of the current input terminal.

Description

Bidirectional regulation of current-fed isolated DC-DC converter change method

The present invention relates to a modulation method, in particular to a bidirectional modulation method of a current-fed isolated DC-to-DC converter.

Traditional DC-to-DC converters are often used in microgrids, energy storage systems, and electric vehicles. They are an emerging type of power converter. Compared with voltage-fed designs, current-feedback designs can make the battery The current at the terminal is more stable and the current control is more convenient, making it more suitable for energy storage system applications. However, the current-feeding input terminal will make the circuit architecture asymmetrical, resulting in when operating in boost mode and buck mode. Different modulation methods will be used, so the traditional method is to propose a switching modulation method and startup method applied to a current-fed isolated DC-DC converter. Both the boost mode and the buck mode only drive a single-side switch. And make the switch on the other side of the transformer use diode rectification; however, the boost mode and buck mode of the converter use completely different control methods, so the circuit requires two sets of controllers to switch when the power direction is converted, so that the control The complexity increases. In addition, in the past method, only one side of the switch is driven, and not all control dimensions are used. As a result, the circuit cannot operate with better efficiency, and in circuit control, if multiple adjustments need to be made at the same time, parameters will greatly increase the complexity of the operation.

In view of the shortcomings of the above-mentioned conventional technologies and at the same time improving the above-mentioned shortcomings, the present invention proposes a bidirectional modulation method using a current-fed isolated DC-DC converter, which can achieve bidirectional power transmission by switching between boost mode and buck mode. to solve the above shortcomings.

In order to achieve the above object, according to a bidirectional modulation method of a current-fed isolated DC-DC converter proposed by the present invention, the converter includes a clamp circuit electrically connected to a current input end, and a power transmission circuit, one end of the power transmission circuit is electrically connected to the clamp circuit, and the other end is electrically connected to a voltage input end, wherein the bidirectional modulation method includes the following steps: (a) through a plurality of switches The signal controls the complex voltage information available to the clamp circuit and the power transmission circuit, and performs a leading component comparison on the complex voltage information to obtain complex leading comparison information, (b) comparing the complex leading comparison information with The complex transmission mode can be obtained by performing a status mode judgment on an output status information. (c) When the complex transmission mode is a boost mode, a low-voltage terminal of the current input terminal is transmitted to a high-voltage terminal of the voltage input terminal. When the complex transmission mode is a boost mode, When the complex transmission mode is a buck mode, the high voltage terminal of the voltage input terminal is transmitted to the low voltage terminal of the current input terminal, thereby achieving bidirectional power transmission between the current input terminal and the voltage input terminal.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the plurality of switching signals includes: a first switching signal for controlling the clamp circuit; a second switching signal and a first switching signal. Three letters The signal is used to control a plurality of low-voltage test switches of the power transmission circuit; a fourth switch signal and a fifth switch signal are used to control a plurality of leading arm switches of the power transmission circuit; and a sixth switch signal and a The seventh switch signal is used to control a plurality of trailing arm switches of the power transmission circuit, through the first switch signal, the second switch signal, the third switch signal, the fourth switch signal, and the fifth switch signal. The sixth switching signal and the seventh switching signal control the clamp circuit and the power transmission circuit respectively, obtain the complex voltage information, and compare the leading component with the complex voltage information, and obtain the complex leading ratio. For the information, the plurality of leading comparison information and the output status information are then judged to determine the status mode, so that the plurality of transmission modes can be obtained.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the leading component comparison is performed by comparing a low-voltage side switching point voltage of the plurality of low-voltage measuring switches with the trailing arm switch and the Comparing the voltage of a high-voltage side switching point of the leading arm switch to obtain the plurality of leading comparison information, and then judging the state mode by comparing the plurality of leading comparison information and the output status information, the complex transmission mode can be obtained. When the low-voltage side switching point voltage leads the high-voltage side switching point voltage, the complex transmission mode is a boost mode. When the high-voltage side switching point voltage leads the low-voltage side switching point voltage, the complex transmission mode is a buck mode.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the low-voltage side switching point voltage includes a low-voltage side positive voltage state, a low-voltage side negative voltage state and a low-voltage side no-voltage state.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the high-voltage side switching point voltage includes a high-voltage side positive voltage state, a high-voltage side negative voltage state and a high-voltage side no-voltage state.

In the bidirectional modulation method of the current-fed isolated DC-to-DC converter of the present invention, the plurality of low-voltage measuring switches are composed of a first low-voltage measuring switch, a second low-voltage measuring switch, a third low-voltage measuring switch and It consists of a fourth low-voltage measuring switch.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the leading arm switch relationship consists of a first leading arm switch and a second leading arm switch.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the trailing arm switch relationship is composed of a first trailing arm switch and a second trailing arm switch.

In the bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention, the clamp circuit is composed of a first switched capacitor and a clamp switch.

The above summary and the following detailed description and drawings are all intended to further explain the methods, means and effects adopted by this creation to achieve the intended purpose. Other purposes and advantages of this creation will be explained in the subsequent descriptions and drawings.

1: Clamp circuit

2: Power transmission circuit

3: Current input terminal

4: Voltage input terminal

11: First capacitor

12:First switch

21: Complex low voltage measuring switch

22:Leading arm switch

23:Lagging arm switch

24: Second inductor

25:Transformer

211: The first low voltage test switch

212: Second low voltage test switch

213: The third low voltage test switch

214: The fourth low voltage test switch

221: First leading arm switch

222: Second leading arm switch

231: First trailing arm switch

232: Second trailing arm switch

31: First inductor

32: Second capacitor

41: The third capacitor

The first figure shows a current-fed isolated DC-to-DC converter according to the present invention. Circuit diagram of bidirectional modulation of stream converter;

The second figure is a schematic diagram of the voltage reduction mode of the bidirectional modulation method of the present invention;

The third figure is a schematic diagram of the boost mode of the bidirectional modulation method of the present invention.

The following is a specific example to illustrate the implementation of this invention. Those familiar with this art can easily understand the advantages and effects of this invention from the content disclosed in this specification.

Please refer to the first figure, a schematic circuit diagram of the bidirectional modulation of the current-fed isolated DC-DC converter of the present invention, in which the bi-directional modulation circuit of the current-fed isolated DC-DC converter is composed of The clamp circuit 1 is composed of a power transmission circuit 2, a current input terminal 3 and a voltage input terminal 4. The clamp circuit 1 is electrically connected to the current input terminal 3, and one end of the power transmission circuit 2 is electrically connected to the clamp circuit. 1. The other end is electrically connected to the voltage input terminal 4; the clamp circuit 1 is composed of a first capacitor 11 and a first switch 12, and the current input terminal 3 is composed of a first inductor 31 and a second capacitor 32. Composition, wherein one end of the first inductor 31 is electrically connected to the first capacitor 11, and the other end is electrically connected to the second capacitor 32.

The power transmission circuit 2 is composed of a plurality of low-voltage measuring switches 21, a plurality of leading arm switches 22, a plurality of trailing arm switches 23, a second inductor 24 and a transformer 25, wherein the plurality of low-voltage measuring switches 21 are composed of a first low-voltage measuring switch. 211. It is composed of the second low-voltage measuring switch 212, the third low-voltage measuring switch 213 and the fourth low-voltage measuring switch 214. One side of the first low-voltage measuring switch 211 and the second low-voltage measuring switch 212 is electrically connected to the second inductor 24. On one side, the other side of the first low-voltage measuring switch 211 is electrically connected to the first capacitor 11, the first inductor 31 and the third low-voltage measuring switch 213. The other side of the second low-voltage measuring switch 212 is electrically connected. One side of the second capacitor 32, the first switch 12 and the fourth low-voltage measuring switch 214 is connected, and the other side of the second inductor 24 is electrically connected to the transformer 25, as well as the third low-voltage measuring switch 213 and the fourth low-voltage measuring switch. The other side of 214 is electrically connected to the transformer 25 .

The plurality of leading arm switches 22 is composed of a first leading arm switch 221 and a second leading arm switch 222, and the plurality of trailing arm switches 23 is composed of a first trailing arm switch 231 and a second trailing arm switch 232, wherein One side of the first leading arm switch 221 and the second leading arm switch 222 is electrically connected to the transformer 25 , and the other side of the first leading arm switch 221 is electrically connected to the first trailing arm switch 231 and the third capacitor 41 . On one side, the other side of the second leading arm switch 222 is one side of the electrical second trailing arm switch 232 and the other side of the third capacitor 41 , as well as the first trailing arm switch 231 and the second trailing arm switch 232 The other side of the transformer 25 is electrically connected.

The bidirectional modulation method of the current-fed isolated DC-DC converter of the present invention includes the following steps: (a) controlling the complex voltage information obtained by the clamp circuit 1 and the power transmission circuit 2 through complex switching signals, and Perform a leading component comparison on the complex voltage information to obtain the complex leading comparison information. (b) Perform a state mode judgment on the complex leading comparison information and an output status information (I _LV ) to obtain the complex transmission mode, (c) when the complex transmission mode is a boost mode, a low voltage terminal of the current input terminal 3 is transmitted to a high voltage terminal of the voltage input terminal 4, when the complex transmission mode is a buck mode, the The high voltage terminal of the voltage input terminal 4 is transmitted to the low voltage terminal of the current input terminal 3, thereby achieving bidirectional power transmission between the current input terminal 3 and the voltage input terminal 4.

Wherein, the plurality of switch signals includes a first switch signal, a second switch signal, a third switch signal, a fourth switch signal, a fifth switch signal, a sixth switch signal and a seventh switch signal, and the first switch signal is used for To control the clamp circuit 1, the second switch signal and the third switch signal are used to control the plurality of low-voltage test switches 21 of the power transmission circuit 2, and a fourth switch signal and a fifth switch signal are used to control the power transmission. A plurality of leading arm switches of the circuit; and a sixth switching signal and a seventh switching signal are used to control a plurality of trailing arm switches of the power transmission circuit, through the first switching signal, the second switching signal, the The third switching signal, the fourth switching signal, the fifth switching signal, the sixth switching signal and the seventh switching signal respectively control the clamping circuit and the power transmission circuit to obtain the complex voltage information and convert the The leading component comparison is performed on the complex voltage information, and the complex leading comparison information can be obtained. Then the complex leading comparison information and the output state information (I _LV ) are used to determine the state mode, and the complex transmission mode can be obtained.

In another preferred embodiment, the leading component comparison is performed by comparing a low-voltage side switching point voltage of the plurality of low-voltage measuring switches 21 with a high-voltage side switching point voltage of the lagging arm switch 23 and the leading arm switch 22 By performing component comparison, the complex leading comparison information can be obtained, and then the complex leading comparing information and the output status information (I _LV ) are used to determine the status mode, and the complex transmission mode can be obtained. When the low-voltage side switching point voltage When the high-voltage side switching point voltage leads the high-voltage side switching point voltage, the complex transmission mode is a boost mode. When the high-voltage side switching point voltage leads the low-voltage side switching point voltage, the complex transmission mode is a buck mode, where the low-voltage side switching point voltage It includes a low-voltage side positive voltage state, a low-voltage side negative voltage state and a low-voltage side no-voltage state. The high-voltage side switching point voltage includes a high-voltage side positive voltage state, a high-voltage side negative voltage state and a high-voltage side no-voltage state.

Please refer to the second figure. The second figure is a schematic circuit diagram of the bidirectional modulation of the current-fed isolated DC-DC converter of the present invention based on the first figure to further illustrate the operation mode of the buck mode; the present invention The bidirectional modulation method of the current-fed isolated DC-DC converter is to control the first switch 12 of the clamp circuit 1 through the first switch signal (V _gsc ), and the second switch signal (V _gs1, V _gs4 ) are used to control the first low-voltage measuring switch 211 and the fourth low-voltage measuring switch 214 of the plurality of low-voltage measuring switches 21, and the third switch signal (V _gs2, V _gs3 ) is used to control the plurality of low-voltage measuring switches. The second low-voltage test switch 212 and the third low-voltage test switch 213 of the switch 21, the fourth switch signal (V _gs5 ) and the fifth switch signal (V _gs6 ) are used to control the first leading arm switch 221 and the second switch respectively. The leading arm switch 222, the sixth switch signal (V _gs7 ) and the seventh switch signal (V _gs8 ) are used to control the first trailing arm switch 231 and the second trailing arm switch 232 respectively.

When the first switch signal (V _gsc ) controls the first switch 12 to be closed and the fourth switch signal (V _gs5 ) controls the first leading arm switch 221 to be closed, the low-voltage side switching point voltage of the plurality of low-voltage measuring switches 21 is consistent with the Comparing the components of the high-voltage side switching point voltages of the lagging arm switch 23 and the leading arm switch 22 can obtain leading comparison information. At this time, the leading comparison information is that the high-voltage side positive voltage state of the high-voltage side switching point voltage leads the low voltage. The negative voltage state of the low-voltage side of the side switching point voltage, and then the leading comparison information and the output status information (I _LV ) are used to determine the status mode. When the status mode is the complex leading comparison information, it is the high-voltage side switching point voltage. When the positive voltage state of the high-voltage side is ahead of the negative voltage state of the low-voltage side of the low-voltage side switching point voltage and the output status information (I _LV ) is a negative voltage, the transmission mode is a buck mode.

Please refer to the third figure. The second figure is a schematic circuit diagram of the bidirectional modulation of the current-fed isolated DC-DC converter of the present invention based on the first figure to further illustrate the operation mode of the boost mode. When the third figure The three switch signals (V _gs2, V _gs3 ) control the second low voltage test switch 212 and the third low voltage test switch 213 to be closed, and the seventh switch signal (V _gs8 ) controls the second trailing arm switch 232 to be open. The low-voltage side switching point voltage of the switch 21 is compared with the high-voltage side switching point voltages of the lagging arm switch 23 and the leading arm switch 22 to obtain leading comparison information. At this time, the leading comparison information is the low-voltage side switching. The positive voltage state of the low-voltage side of the point voltage leads the negative voltage state of the high-voltage side of the high-voltage side switching point voltage. Then the leading information is compared with the output status information (I _LV ) to determine the status mode. When the status mode is the leading When the comparison information is that the low-voltage side positive voltage state of the low-voltage side switching point voltage is ahead of the high-voltage side negative voltage state of the high-voltage side switching point voltage and the output state information (I _LV ) is a positive voltage, the transmission mode is a boost mode.

It needs to be stated that the above are only preferred embodiments of this case and are not intended to limit this creation. If changes are made based on the concept of this creation, they will not deviate from the scope of the spirit of this creation, such as: for configuration or layout. If the form is transformed, the equivalent effects produced by various changes, modifications and applications should be included in the scope of the rights of this case and be stated together.

1: Clamp circuit

2: Power transmission circuit

3: Current input terminal

4: Voltage input terminal

11: First capacitor

12:First switch

21: Complex low voltage measuring switch

22:Leading arm switch

23:Lagging arm switch

24: Second inductor

25:Transformer

211: The first low voltage test switch

212: Second low voltage test switch

213: The third low voltage test switch

214: The fourth low voltage test switch

221: First leading arm switch

222: Second leading arm switch

231: First trailing arm switch

232: Second trailing arm switch

31: First inductor

32: Second capacitor

41: The third capacitor

Claims (8)

A bidirectional modulation method for a current-fed isolated DC-to-DC converter. The converter includes a clamp circuit electrically connected to a current input terminal and a power transmission circuit. The power transmission circuit One end of the circuit is electrically connected to the clamp circuit, and the other end is electrically connected to a voltage input end, wherein the bidirectional modulation method includes the following steps: (a) controlling the clamp circuit and the power transmission circuit through complex switching signals The plurality of voltage information can be obtained, and the plurality of voltage information is compared with a leading component, and the plurality of leading comparison information can be obtained. (b) The plurality of leading comparison information and an output state information can be subjected to a state mode judgment. To obtain the complex transmission mode, (c) when the complex transmission mode is a boost mode, a low voltage terminal of the current input terminal is transmitted to a high voltage terminal of the voltage input terminal, and when the complex transmission mode is a buck mode, the The high-voltage terminal of the voltage input terminal is transmitted to the low-voltage terminal of the current input terminal, thereby achieving bidirectional power transmission between the current input terminal and the voltage input terminal, in which the leading arm switch relationship consists of a first leading arm switch and a second leading arm switch. Composed of leading arm switch. As described in item 2 of the patent application, the bidirectional modulation method of the current-fed isolated DC-DC converter, wherein the plurality of switching signals includes: a first switching signal is used to control the clamp circuit; A second switch signal and a third switch signal are used to control a plurality of low-voltage test switches of the power transmission circuit; a fourth switch signal and a fifth switch signal are used to control a plurality of leading arms of the power transmission circuit. switch; and a sixth switch signal and a seventh switch signal are used to control a plurality of trailing arm switches of the power transmission circuit, by the first switch signal, the second switch signal, the third switch signal, the The fourth switch signal, the fifth switch signal, the sixth switch signal and the seventh switch signal respectively control the clamp circuit and the power transmission circuit, obtain the complex voltage information, and perform the leading on the complex voltage information. The components are compared, and the plurality of leading comparison information can be obtained. Then the plurality of leading comparison information and the output status information are used to determine the status mode, and the plurality of transmission modes can be obtained. As described in item 2 of the patent application, the bidirectional modulation method of the current-fed isolated DC-DC converter, wherein the leading component comparison is by comparing a low-voltage side switching point voltage of the plurality of low-voltage measuring switches with Comparing the components of a high-voltage side switching point voltage of the lagging arm switch and the leading arm switch can obtain a plurality of leading comparison information, and then use the plurality of leading comparison information and the output state information to determine the state mode. The complex transmission mode is obtained. When the low-voltage side switching point voltage leads the high-voltage side switching point voltage, the complex transmission mode is a boost mode. When the high-voltage side switching point voltage leads the low-voltage side switching point voltage, the complex transmission mode mode is buck mode. As described in item 3 of the patent application, the bidirectional modulation method of the current-fed isolated DC-DC converter, wherein the low-voltage side switching point voltage includes a low-voltage side positive voltage state, a low-voltage side negative voltage state and a No voltage state. As described in item 3 of the patent application, the bidirectional modulation method of the current-fed isolated DC-DC converter, wherein the high-voltage side switching point voltage includes a high-voltage side positive voltage state, a high-voltage side negative voltage state and a There is no voltage on the high voltage side. As described in item 2 of the patent application, the bidirectional modulation method of the current-fed isolated DC-DC converter, wherein the plurality of low-voltage test switches consists of a first low-voltage test switch, a second low-voltage test switch, and a second low-voltage test switch. It is composed of a third low-voltage measuring switch and a fourth low-voltage measuring switch. As described in item 2 of the patent application, the bidirectional modulation method of a current-fed isolated DC-DC converter, wherein the trailing arm switch relationship is composed of a first trailing arm switch and a second trailing arm switch. For example, in the bidirectional modulation method of a current-fed isolated DC-DC converter described in item 2 of the patent application, the clamp circuit is composed of a first switched capacitor and a clamp switch.

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