TWM470447U - Bi-directional DC/DC converter - Google Patents

Abstract

A bidirectional DC/DC converter comprises first and second power storage units, first and second bi-directional non-isolated converting circuits, first and second capacitors and a ground line. The second power storage unit is coupled to the first power storage unit. The first and second capacitors are coupled to the first and second bi-directional non-isolated converting circuits respectively. The ground line is coupled between the first and second power storage units, between the first and second bi-directional non-isolated converting circuits and between the first and second capacitors. When the voltage imbalance of the first and the second capacitors, the first and second currents flow through the first and second bi-directional non-isolated converting circuits respectively, while the first and second currents charged with the first and second power storage units, so as to balance the voltage of the first capacitor and second capacitor.

Description

Bidirectional DC/DC voltage conversion device

The present invention is to provide a voltage conversion device, and more particularly to a bidirectional DC/DC voltage conversion device.

In the conventional UPS and inverter related topologies, the circuit structures of the positive bus and the negative bus are commonly used, such as in the UPS. The DC/DC voltage conversion device generally outputs a positive DC voltage through the first capacitor and a negative DC voltage through the second capacitor, wherein the input of the DC/DC voltage conversion device can be a non-isolated conversion of two DC inputs or one DC input. The circuit, or the input can be an isolated conversion circuit of two DC inputs or one DC input.

However, the output of the DC/DC voltage conversion device is usually a circuit composed of a transformer and a diode, so the energy flows in one direction, and the DC/DC voltage conversion device usually has the voltages of the first and second capacitors. Balance problem, for example, when the first and second capacitor outputs are unbalanced, the voltages of the first and second capacitors will be unbalanced, especially when the reverse current is reversed to the first and second capacitors due to the output. The terminal adopts a one-way diode structure to enable energy to charge only the first and second capacitors. When the voltages of the first and second capacitors are charged by the reversed reverse current, the first and second effects are affected. The output voltage of the second capacitor to the subsequent stage circuit. Therefore, the DC/DC voltage conversion device may cause a potential imbalance or may not be safely supplied to the load.

In addition, if the DC/DC voltage conversion device needs to charge the rechargeable battery at the input end, the DC/DC voltage conversion device needs to be additionally designed with a charging circuit. Now, as a result, the circuit of the DC/DC voltage conversion device will be more complicated and costly.

The present invention aims to provide a bidirectional DC/DC voltage conversion device to solve the above problems.

The present invention proposes a bidirectional DC/DC voltage conversion device, comprising: a first power storage unit, a first bidirectional non-isolated conversion circuit, a first capacitor, a second power storage unit, a second bidirectional non-isolated conversion circuit, and a The second capacitor is connected to a ground line. The first bidirectional non-isolated switching circuit is coupled to the first pole of the first power storage unit. The first capacitor is coupled to the first bidirectional non-isolated switching circuit. The second power storage unit is coupled to the second pole of the first power storage unit. The second bidirectional non-isolated switching circuit is coupled to the second pole of the second power storage unit and the first bidirectional non-isolated switching circuit. The second capacitor is coupled to the second bidirectional non-isolated conversion circuit and the first capacitor. The grounding line is coupled between the second pole of the first power storage unit and the first pole of the second power storage unit, between the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit, and the first capacitor and the second capacitor between. Wherein, when the voltages of the first capacitor and the second capacitor are unbalanced, the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit operate in a buck mode to make a first flow into the first capacitor The current is charged to the first power storage unit via the first bidirectional non-isolated switching circuit, and a second current flowing into the second capacitor is charged through the second bidirectional non-isolated switching circuit to charge the second power storage unit to balance The voltage of a capacitor and a second capacitor.

The present invention proposes a bidirectional DC/DC voltage conversion device, comprising: a first power storage unit, a first bidirectional non-isolated conversion circuit, a first capacitor, a second bidirectional non-isolated conversion circuit, a second capacitor and a ground. line. The first bidirectional non-isolated switching circuit is coupled to the first pole of the first power storage unit. The first capacitor is coupled to the first bidirectional non-isolated switching circuit. The second bidirectional non-isolated switching circuit is coupled to the second pole of the first power storage unit and the first bidirectional non-isolated switching circuit. The second capacitor is coupled to the second bidirectional non-isolated Converting the circuit to the first capacitor. The ground line is coupled between the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit, and between the first capacitor and the second capacitor. Wherein, when the voltages of the first capacitor and the second capacitor are unbalanced, the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit operate in a buck mode to make a first flow into the first capacitor The current is charged to the first power storage unit via the first bidirectional non-isolated switching circuit, and a second current flowing into the second capacitor is charged through the second bidirectional non-isolated switching circuit to charge the second power storage unit to balance The voltage of a capacitor and a second capacitor.

The present invention proposes a bidirectional DC/DC voltage conversion device, comprising: a first power storage unit, a first bidirectional isolation conversion circuit, a first capacitor, a second power storage unit, a second bidirectional isolation conversion circuit, and a second Capacitor and a transmission line. The first bidirectional isolation conversion circuit is coupled to the first power storage unit. The first capacitor is coupled to the first bidirectional isolation conversion circuit. The second bidirectional isolation conversion circuit is coupled to the second power storage unit. The second capacitor is coupled to the second bidirectional isolation conversion circuit. The transmission line is coupled between the first capacitor and the second capacitor. Wherein, when the voltages of the first capacitor and the second capacitor are unbalanced, the first bidirectional isolation conversion circuit and the second bidirectional isolation conversion circuit operate in a voltage transformation mode to enable a first current flowing into the first capacitor The first power storage unit is charged by the first bidirectional isolation conversion circuit, and a second current flowing into the second capacitor is charged to the second power storage unit via the second bidirectional isolation conversion circuit to balance the first capacitance and the first The voltage of the two capacitors.

The present invention proposes a bidirectional DC/DC voltage conversion device comprising: a first power storage unit, a first bidirectional isolation conversion circuit, a first capacitor, a second bidirectional isolation conversion circuit, a second capacitor and a transmission line. The first bidirectional isolation conversion circuit is coupled to the first power storage unit. The first capacitor is coupled to the first bidirectional isolation conversion circuit. The second bidirectional isolation conversion circuit is coupled to the first power storage unit. The second capacitor is coupled to the second bidirectional isolation conversion circuit. The transmission line is coupled between the first capacitor and the second capacitor. Wherein, when the voltages of the first capacitor and the second capacitor are unbalanced, the first bidirectional isolation conversion circuit and the second bidirectional isolation conversion circuit operate in a transformer conversion mode to enable one The first current flowing into the first capacitor passes through the first bidirectional isolation conversion circuit to charge the first power storage unit, and causes a second current flowing into the second capacitor to pass through the second bidirectional isolation conversion circuit to charge the second power storage unit To balance the voltage of the first capacitor and the second capacitor.

The present invention proposes a bidirectional DC/DC voltage conversion device comprising: a first power storage unit, a bidirectional isolation conversion circuit, a storage capacitor, a first bidirectional non-isolated conversion circuit, a first capacitor, and a second bidirectional non-isolation a conversion circuit, a second capacitor, and a ground line. The bidirectional isolation conversion circuit is coupled to the first power storage unit. The storage capacitor is coupled to the bidirectional isolation conversion circuit. The first bidirectional non-isolated conversion circuit is coupled to the storage capacitor. The first capacitor is coupled to the first bidirectional non-isolated switching circuit. The second bidirectional non-isolated conversion circuit is coupled between the storage capacitor and the first bidirectional non-isolated conversion circuit. The second capacitor is coupled to the second bidirectional non-isolated conversion circuit and the first capacitor. The grounding line is coupled between the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit, between the first capacitor and the second capacitor. Wherein, when the voltages of the first capacitor and the second capacitor are unbalanced, the bidirectional isolation conversion circuit operates in a transformer conversion mode, and the first bidirectional non-isolated conversion circuit and the second bidirectional non-isolated conversion circuit operate at a lower limit Pressing mode, such that a first current flowing into the first capacitor will be charged to the first power storage unit via the first bidirectional non-isolated conversion circuit, the storage capacitor and the bidirectional isolation conversion circuit, and a second current flowing into the second capacitor The first power storage unit is charged via the second bidirectional non-isolated conversion circuit, the storage capacitor and the bidirectional isolation conversion circuit to balance the voltages of the first capacitor and the second capacitor.

The bidirectional DC/DC voltage conversion device of the present invention converts the first and second currents flowing into the first and second capacitors through the first and second bidirectional non-isolated conversion circuits (or the first and second bidirectional isolation conversions respectively) The circuit) charges the first and second power storage units to balance the voltages of the first and second capacitors, thereby improving the usability and safety of the two-way DC/DC voltage conversion device.

The above description of the present content and the description of the following embodiments are used to illustrate and explain the principles of the present invention, and to provide a patent application scope of the present invention. Step explanation.

1, 2, 3, 4, 5‧‧‧ bidirectional DC/DC voltage conversion devices

31, 41‧‧‧ first bidirectional isolation conversion circuit

11, 21, 51‧‧‧ first bidirectional non-isolated conversion circuit

32, 42‧‧‧Second two-way conversion circuit

12, 22, 52‧‧‧ second bidirectional non-isolated conversion circuit

50‧‧‧Two-way conversion circuit

S1‧‧‧first switch

B1‧‧‧First power storage unit

S2‧‧‧Second switch

B2‧‧‧Second power storage unit

S3‧‧‧ third switch

L1‧‧‧first inductance

S4‧‧‧fourth switch

L2‧‧‧second inductance

D1‧‧‧First Diode

C1‧‧‧first capacitor

D2‧‧‧ second diode

C2‧‧‧second capacitor

D3‧‧‧ third diode

16, 26, 56‧‧‧ Grounding lines

D4‧‧‧ fourth diode

36, 46‧‧‧ transmission line

CB‧‧‧ storage capacitor

+‧‧‧first pole

-‧‧‧Second pole

FIG. 1A is a schematic diagram of a bidirectional DC/DC voltage conversion device according to an embodiment of the present invention.

1B is a circuit diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention of FIG. 1A.

2A is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention.

2B is a circuit diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention of FIG. 2A.

FIG. 3 is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention.

4 is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention.

FIG. 1A is a schematic diagram of a bidirectional DC/DC voltage conversion device according to an embodiment of the present invention. 1B is a circuit diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention of FIG. 1A. Please refer to FIG. 1A and FIG. 1B. A bidirectional DC/DC voltage conversion device 1 includes: a first power storage unit B1, a first bidirectional non-isolated conversion circuit 11, a first capacitor C1, a second power storage unit B2, and a second bidirectional non-isolated conversion circuit 12. A second capacitor C2 and a ground line 16.

In detail, the bidirectional DC/DC voltage conversion device 1 of the present embodiment is described by a dual input dual output step-up/step-down conversion circuit, and the current flow of the bidirectional DC/DC voltage conversion device 1 can be self-contained. The second power storage unit B1, B2 flows to the first side And the second capacitors C1, C2 side, and from the first and second capacitors C1, C2 side to the first and second power storage units B1, B2 side, thereby achieving the effect of bidirectional DC / DC voltage conversion, this embodiment does not The aspect of the bidirectional DC/DC voltage conversion device 1 is limited.

The first and second power storage units B1 and B2 are, for example, a lithium battery, a nickel hydrogen battery, or a rechargeable battery. This embodiment does not limit the aspects of the first and second power storage units B1 and B2. In practice, the first pole of the first power storage unit B1 is coupled to the first bidirectional non-isolated switching circuit 11, and the second pole of the first power storage unit B1 is coupled to the first pole + of the second power storage unit B2. The second pole of the second power storage unit B2 is coupled to the second bidirectional non-isolated switching circuit 12, wherein the first power storage unit B1 is connected in series with the second power storage unit B2. This embodiment does not limit the first and second power storage units B1 and B2. The number and appearance of the connection. For convenience of description, the first pole of the embodiment is a positive pole and the second pole is a cathode. In other embodiments, the first pole may be a cathode and the second pole may be a cathode. The pattern of one pole + and the second pole -.

The first bidirectional non-isolated switching circuit 11 is coupled to the first pole + of the first power storage unit B1. In practice, the first bidirectional non-isolated switching circuit 11 includes a first inductor L1, a first switch S1 and a third switch S3. In practice, the first inductor L1 is coupled to the first pole + of the first power storage unit B1. The first switch S1 is coupled to the first inductor L1 and parallel to the first diode D1. The third switch S3 is coupled between the first inductor L1 and the first switch S1, and is connected in parallel with a third diode D3.

In detail, the bidirectional DC/DC voltage conversion device 1 operates in a booster circuit mode to transfer energy from the first power storage unit B1 side to the first capacitor C1 side, for example, the current from the first power storage unit B1 side through the first The two-way non-isolated switching circuit 11 flows to the first capacitor C1, wherein the first and third switching switches S1, S3 are operable in an on or off state, for example, when the first and third switching switches S1, S3 are both turned off, the first The power storage unit B1 supplies a forward current to the first capacitor C1 to cause the first capacitor C1 to establish a first voltage. When the first switch S1 is turned off and the third switch S3 is turned on, the first capacitor C1 is discharged.

Conversely, the bidirectional DC/DC voltage conversion device 1 operates in a buck mode. The energy is transmitted from the first capacitor C1 side to the first power storage unit B1 side, for example, current flows from the first capacitor C1 side to the first power storage unit B1 via the first bidirectional non-isolated switching circuit 11, wherein the first and third switching switches S1 and S3 are operable in an on or off state. For example, when the first changeover switch S1 is turned on and the third changeover switch S3 is turned off, the first capacitor C1 supplies a reverse current to the first power storage unit B1. This embodiment does not limit the operational aspect of the bidirectional DC/DC voltage converting device 1.

The first and third switching switches S1 and S3 are, for example, a metal oxide half field effect transistor (MOSFET), a power transistor (FET) or an insulated gate bipolar transistor (IGBT). The first embodiment does not limit the first and the third. The three switches switch S1, S3.

Similarly, the second bidirectional non-isolated switching circuit 12 is coupled to the second pole of the second power storage unit B2 and the first bidirectional non-isolated switching circuit 11. In practice, the second bidirectional non-isolated switching circuit 12 includes a second inductor L2, a second switch S2, and a fourth switch S4. The second inductor L2 is coupled to the second pole of the second power storage unit B2. The second switch S2 is coupled to the second inductor L2 and parallel to a second diode D2. The fourth switch S4 is coupled between the second inductor L2 and the second switch S2, and is connected in parallel with a fourth diode D4.

The bidirectional DC/DC voltage conversion device 1 is operated in a booster circuit mode to transfer energy from the second power storage unit B2 side to the second capacitor C2 side, for example, current from the second power storage unit B2 side via the second bidirectional non-isolated conversion The circuit 12 flows to the second capacitor C2. On the contrary, the bidirectional DC/DC voltage conversion device 1 operates in a step-down mode to transfer energy from the second capacitor C2 side to the second power storage unit B2 side, for example, the current from the second capacitor C2 side through the second bidirectional non-isolated conversion. The circuit 12 flows to the second power storage unit B2.

The second and fourth switching switches S4 are, for example, a metal oxide half field effect transistor (MOSFET), a power transistor (FET) or an insulated gate bipolar transistor (IGBT). The second and fourth switching are not limited in this embodiment. The aspect of the switch S4.

The first capacitor C1 is coupled to the first bidirectional non-isolated switching circuit 11 , and the second capacitor C2 is coupled to the second bidirectional non-isolated switching circuit 12 . In practice, the first and second capacitors C1 and C2 are used to store energy, thereby establishing a first voltage and a second voltage. In detail, when the reverse current is poured toward the first and second capacitors C1 and C2, the first and second bidirectional non-isolated switching circuits 11, 12 are dual-conducted at the output end, so that the energy can pass through the first The second bidirectional non-isolated switching circuits 11 and 12 charge the first and second power storage units B1 and B2, so that the voltages of the first and second capacitors C1 and C2 are not charged by the reverse current of the backflow, thereby The influence of the unbalanced voltages of the first and second capacitors C1 and C2 on the subsequent stage circuit is reduced.

The grounding line 16 is coupled between the second pole of the first power storage unit B1 and the first pole + of the second power storage unit B2, between the first bidirectional non-isolated switching circuit 11 and the second bidirectional non-isolated switching circuit 12, and Between the first capacitor C1 and the second capacitor C2. In practice, the ground line 16 is, for example, a floating ground or a ground. This embodiment does not limit the aspect of the ground line 16. The ground line 16 is, for example, a reference reference potential of the first and second power storage units B1, B2 such that the first pole + side of the first power storage unit B1 forms a positive bus, and the second pole side of the second power storage unit B2 forms Negative busbar.

When the voltages of the first capacitor C1 and the second capacitor C2 are in an unbalanced state, a first current flowing into the first capacitor C1 will pass through the first bidirectional non-isolated switching circuit 11 to charge the first power storage unit B1. And a second current flowing into the second capacitor C2 will be charged to the second power storage unit B2 via the second bidirectional non-isolated switching circuit 12 to balance the voltages of the first capacitor C1 and the second capacitor C2.

For example, when the voltages of the first capacitor C1 and the second capacitor C2 are in an unbalanced state, the first and second bidirectional non-isolated switching circuits 11 and 12 operate in a buck mode, and the first diverter switch S1 is turned on. The third switch S3 is turned off to control the first current to be charged to the first power storage unit B1 via the first switch S1 and the first inductor L1, and the second switch S2 is turned on and the fourth switch S4 is turned off to Controlling the second current will charge the second power storage unit B2 via the second changeover switch S2 and the second inductance L2.

2A is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention; intention. 2B is a circuit diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention of FIG. 2A. Please refer to FIG. 2A and FIG. 2B.

The bidirectional DC/DC voltage conversion device 2 of FIGS. 2A and 2B is similar in structure to the bidirectional DC/DC voltage conversion device 1 of FIGS. 1A and 1B, and the difference between the bidirectional DC/DC voltage conversion devices 2 and 1. The bidirectional DC/DC voltage conversion device 2 of the present embodiment is described by a single input dual output step-up/step-down conversion circuit, and the current flow of the bidirectional DC/DC voltage conversion device 2 is available from the first power storage unit B1. The side flows to the first and second capacitors C1 and C2, and flows from the first and second capacitors C1 and C2 to the first power storage unit B1 side, thereby achieving the effect of bidirectional DC/DC voltage conversion, which is not limited in this embodiment. The aspect of the bidirectional DC/DC voltage conversion device 2.

A bidirectional DC/DC voltage conversion device 2 includes a first power storage unit B1, a first bidirectional non-isolated conversion circuit 21, a first capacitor C1, a second bidirectional non-isolated conversion circuit 22, and a second capacitor C2. A ground line 26.

The first bidirectional non-isolated switching circuit 21 is coupled to the first pole + of the first power storage unit B1, and the first capacitor C1 is coupled to the first bidirectional non-isolated switching circuit 21, whereby the first pole + side forms a positive bus. The first bidirectional non-isolated switching circuit 21 includes a first inductor L1, a first switching switch S1 and a third switching switch S3. The first inductor L1 is coupled to the first pole + of the first power storage unit B1. The first switch S1 is coupled to the first inductor L1 and parallel to the first diode D1. The third switch S3 is coupled between the first inductor L1 and the first switch S1, and is connected in parallel with a third diode D3.

The second bidirectional non-isolated switching circuit 22 is coupled between the second pole of the first power storage unit B1 and the first bidirectional non-isolated switching circuit 21, and the second capacitor C2 is coupled to the second bidirectional non-isolated switching circuit 22. The second pole-side forms a negative bus. The second bidirectional non-isolated switching circuit 22 includes a second switching switch S2 and a fourth switching switch S4. The second switch S2 is coupled to the second pole of the first power storage unit B1 and parallel to the second diode D2. The fourth switch S4 is coupled between the first bidirectional non-isolated switching circuit 21 and the second switch S2, and is connected in parallel with a fourth diode D4.

The grounding line 26 is coupled between the first bidirectional non-isolated switching circuit 21 and the second bidirectional non-isolated switching circuit 22, and between the first capacitor C1 and the second capacitor C2. When the voltages of the first capacitor C1 and the second capacitor C2 are in an unbalanced state, a first current flowing into the first capacitor C1 passes through the first bidirectional non-isolated switching circuit 21, and the first power storage unit B1 is charged. And a second current flowing into the second capacitor C2 will be charged to the second power storage unit B2 via the second bidirectional non-isolated switching circuit 22 to balance the voltages of the first capacitor C1 and the second capacitor C2.

In addition to the above differences, those skilled in the art should be able to easily infer from the foregoing embodiments and the above differences, and therefore will not be described herein.

FIG. 3 is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention. Please refer to Figure 3. The bidirectional DC/DC voltage conversion device 3 of FIG. 3 is similar in structure to the bidirectional DC/DC voltage conversion device 1 of FIG. 1A, and the difference between the bidirectional DC/DC voltage conversion devices 3 and 1 is: The bidirectional DC/DC voltage conversion device 3 is described by two bidirectional isolation conversion circuits, and the current flow of the bidirectional DC/DC voltage conversion device 3 can flow from the first and second power storage units B1 and B2 to the first and second. The capacitors C1 and C2 are side-to-side and flow from the first and second capacitors C1 and C2 to the first and second power storage units B1 and B2, thereby achieving the effect of bidirectional DC/DC voltage conversion. This embodiment does not limit bidirectional DC. / The aspect of the DC voltage conversion device 3.

A bidirectional DC/DC voltage conversion device 3 includes a first power storage unit B1, a first bidirectional isolation conversion circuit 31, a first capacitor C1, a second power storage unit B2, and a second bidirectional isolation conversion circuit 32. The second capacitor C2 is connected to a transmission line 36.

The first bidirectional isolation conversion circuit 31 is coupled to the first power storage unit B1, and the first capacitor C1 is coupled to the first bidirectional isolation conversion circuit 31. The second bidirectional isolation conversion circuit 32 is coupled to the second power storage unit B2, and the second capacitor C2 is coupled to the second bidirectional isolation conversion circuit 32. In practice, the first and second bidirectional isolation conversion circuits 31, 32 are, for example, The transformer is implemented to operate the first and second bidirectional isolation conversion circuits 31, 32 in a transformer conversion mode, wherein the coil turns ratio of the first side and the second side of the transformer can be a preset value, and The one-side and the second-side can be respectively coupled to a full-bridge circuit, a half-bridge circuit or a push-pull circuit, thereby implementing a transformer conversion mode, and a person skilled in the art should know the circuit of the transformer transformer conversion mode. Architecture, which will not be described herein, the embodiment does not limit the aspects of the first and second bidirectional isolation conversion circuits 31, 32. The transmission line 36 is coupled between the first capacitor C1 and the second capacitor C2.

When the voltages of the first capacitor C1 and the second capacitor C2 are in an unbalanced state, a first current flowing into the first capacitor C1 will pass through the first bidirectional isolation conversion circuit 31, and the first power storage unit B1 is charged, and an inflow The second current of the second capacitor C2 will be charged to the second power storage unit B2 via the second bidirectional isolation conversion circuit 32 to balance the voltages of the first capacitor C1 and the second capacitor C2.

In addition to the above differences, those skilled in the art should be able to easily infer from the foregoing embodiments and the above differences, and therefore will not be described herein.

4 is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention. Please refer to Figure 4. The bidirectional DC/DC voltage conversion device 4 of FIG. 4 is similar in structure to the bidirectional DC/DC voltage conversion device 2 of FIG. 2A, and the difference between the bidirectional DC/DC voltage conversion devices 4, 2 is: The bidirectional DC/DC voltage conversion device 4 is illustrated by two bidirectional isolation conversion circuits, and the current flow of the bidirectional DC/DC voltage conversion device 4 can flow from the first power storage unit B1 side to the first and second capacitors C2 and C2. And the flow from the first and second capacitors C2, C2 to the first power storage unit B1 side, thereby achieving the effect of bidirectional DC/DC voltage conversion, and the embodiment does not limit the aspect of the bidirectional DC/DC voltage conversion device 4.

A bidirectional DC/DC voltage conversion device 4 includes a first power storage unit B1, a first bidirectional isolation conversion circuit 41, a first capacitor C1, a second bidirectional isolation conversion circuit 42, a second capacitor C2, and a ground. Line 26. The first bidirectional isolation conversion circuit 41 is coupled to the first power storage unit B1, and the first capacitor C1 is coupled to the first two-way isolation Off the conversion circuit 41. The second bidirectional isolation conversion circuit 42 is coupled to the first power storage unit B1, and the second capacitor C2 is coupled to the second bidirectional isolation conversion circuit 42. The transmission line 46 is coupled between the first capacitor C1 and the second capacitor C2.

When the voltages of the first capacitor C1 and the second capacitor C2 are in an unbalanced state, a first current flowing into the first capacitor C1 will pass through the first bidirectional isolation conversion circuit 41, and the first power storage unit B1 is charged, and an inflow The second current of the second capacitor C2 will be charged to the second power storage unit B2 via the second bidirectional isolation conversion circuit 42 to balance the voltages of the first capacitor C1 and the second capacitor C2.

In addition to the above differences, those skilled in the art should be able to easily infer from the foregoing embodiments and the above differences, and therefore will not be described herein.

Next, the bidirectional DC/DC voltage converting device 5 is further explained, for example, in the aspect and operation of the multi-stage switching output.

FIG. 5 is a schematic diagram of a bidirectional DC/DC voltage conversion device according to another embodiment of the present invention. Please refer to Figure 5. The bidirectional DC/DC voltage conversion device 5 of the present embodiment is similar to the bidirectional DC/DC voltage conversion device 1 of the previous embodiment. For example, the bidirectional DC/DC voltage conversion device 5 can also apply voltages to the first and second capacitors C1 and C2. When an unbalanced state occurs, the first and second currents are charged to the first power storage unit B1 via the first and second bidirectional non-isolated switching circuits 51, 52, the storage capacitor CB, and the bidirectional isolation conversion circuit 50, respectively. However, the difference between the two-way DC/DC voltage conversion devices 5, 1 is that the bidirectional DC/DC voltage conversion device 5 of the present invention can be combined with the bidirectional isolation conversion circuit 50, the first and second bidirectional non-isolated conversion circuits 51, 52. .

A bidirectional DC/DC voltage conversion device 5 includes a first power storage unit B1, a bidirectional isolation conversion circuit 50, a storage capacitor CB, a first bidirectional non-isolated conversion circuit 51, a first capacitor C1, and a second bidirectional The non-isolated conversion circuit 52 and a second capacitor C2.

The bidirectional isolation conversion circuit 50 is coupled to the first power storage unit B1. The storage capacitor CB is coupled to the bidirectional isolation conversion circuit 50. In practice, the bidirectional isolation conversion circuit 50 is, for example, transparent. The transformer is implemented to operate the bidirectional isolation conversion circuit 50 in a transformer conversion mode, wherein the turns ratio of the first side and the second side of the transformer can be a preset value, and the first side and the second side The full-bridge circuit, the half-bridge circuit or the push-pull circuit can be respectively coupled to realize the transformer conversion mode, and the circuit structure of the transformer transformer conversion mode should be known to those skilled in the art. It is to be noted that the embodiment does not limit the aspect of the bidirectional isolation conversion circuit 50.

The first bidirectional non-isolated conversion circuit 51 is coupled to the storage capacitor CB. The first capacitor C1 is coupled to the first bidirectional non-isolated switching circuit 51. The second bidirectional non-isolated switching circuit 52 is coupled to the storage capacitor CB and the first bidirectional non-isolated switching circuit 51. The second capacitor C2 is coupled to the second bidirectional non-isolated switching circuit 52. The transmission line 56 is coupled between the first capacitor C1 and the second capacitor C2.

In detail, the first bidirectional non-isolated switching circuit 51 includes a first inductor L1, a first switching switch S1 and a third switching switch S3. The first inductor L1 is coupled to the first pole + of the first power storage unit B1. The first switch S1 is coupled to the first inductor L1 and parallel to the first diode D1. The third switch S3 is coupled between the first inductor L1 and the first switch S1, and is connected in parallel with a third diode D3. The second bidirectional non-isolated switching circuit 52 includes a second switching switch S2 and a fourth switching switch S4. The second switch S2 is coupled to the second pole of the first power storage unit B1 and parallel to the second diode D2. The fourth switch S4 is coupled between the first bidirectional non-isolated switching circuit 51 and the second switch S2, and is connected in parallel with a fourth diode D4.

When the voltages of the first capacitor C1 and the second capacitor C2 are in an unbalanced state, a first current flowing into the first capacitor C1 passes through the first bidirectional non-isolated conversion circuit 51, the storage capacitor CB, and the bidirectional isolation conversion circuit 50, and The first power storage unit B1 is charged, and a second current flowing into the second capacitor C2 is charged to the first power storage unit B1 via the second bidirectional non-isolated conversion circuit 52, the storage capacitor CB, and the bidirectional isolation conversion circuit 50. The voltages of the first capacitor C1 and the second capacitor C2 are balanced.

In addition to the above differences, those skilled in the art should be able to easily infer from the foregoing embodiments and the above differences, and therefore will not be described herein.

In summary, the present invention is a bidirectional DC/DC voltage conversion device, and the bidirectional DC/DC voltage conversion device passes the first and second currents through the first and second bidirectional non-isolated conversion circuits respectively (or the first and The second bidirectional isolation conversion circuit) charges the first and second power storage units to balance the voltages of the first and second capacitors. The bidirectional DC/DC voltage conversion device of the present invention also enables current to flow from the first and second power storage unit sides to the first and second capacitor sides, and from the first and second capacitor sides to the first and second power storage. The unit side, thereby achieving the effect of bidirectional DC/DC voltage conversion. In addition, the present invention further provides a bidirectional DC/DC voltage conversion device combining a bidirectional isolation conversion circuit and two bidirectional non-isolated conversion circuits. In this way, the bidirectional DC/DC voltage conversion device of the present invention improves the convenience and safety of operation.

In summary, this creation has already met the requirements of the new patent and applied in accordance with the law. However, the above disclosures are only preferred embodiments of the present invention, and the scope of rights of the present invention cannot be limited thereto. Therefore, the equal changes or modifications made according to the scope of the application of the present application are still covered by the present application.

1‧‧‧Bidirectional DC/DC voltage conversion device

11‧‧‧First bidirectional non-isolated conversion circuit

12‧‧‧Second bidirectional non-isolated conversion circuit

B1‧‧‧First power storage unit

B2‧‧‧Second power storage unit

C1‧‧‧first capacitor

C2‧‧‧second capacitor

16‧‧‧ Grounding circuit

+‧‧‧first pole

-‧‧‧Second pole

Claims (11)

A bidirectional DC/DC voltage conversion device includes: a first power storage unit; a first bidirectional non-isolated conversion circuit coupled to a first pole of the first power storage unit; and a first capacitor coupled to the first two-way a non-isolated switching circuit; a second power storage unit coupled to a second pole of the first power storage unit; a second two-way non-isolated switching circuit coupled to a second pole of the second power storage unit and the first two-way a non-isolated switching circuit; a second capacitor coupled to the second bidirectional non-isolated switching circuit and the first capacitor; and a ground line coupled to the second pole of the first power storage unit and the second power storage unit Between a first pole, between the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit, and between the first capacitor and the second capacitor; wherein, when the first capacitor and the first When the voltage of the two capacitors is unbalanced, the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit operate in a buck mode, so that a first current flowing into the first capacitor passes through the first Two-way non-isolated transfer Replacing the circuit, charging the first power storage unit, and causing a second current flowing into the second capacitor to pass through the second bidirectional non-isolated switching circuit to charge the second power storage unit to balance the first capacitance with The voltage of the second capacitor. The bidirectional DC/DC voltage conversion device of claim 1, wherein the first bidirectional non-isolated conversion circuit comprises: a first inductor coupled to the first pole of the first power storage unit; and a first switch a switch coupled to the first inductor and connected in parallel with the first diode And a third switch, coupled between the first inductor and the first switch, and a third diode connected in parallel. The bidirectional DC/DC voltage conversion device of claim 2, wherein when the voltages of the first capacitor and the second capacitor are unbalanced, the first switch is turned on and the third switch is turned off. The first power storage unit is charged by the first current switch and the first power switch. The bidirectional DC/DC voltage conversion device of claim 1 or 2, wherein the second bidirectional non-isolated conversion circuit comprises: a second inductor coupled to the second pole of the second power storage unit; a switching switch coupled to the second inductor and paralleling a second diode; and a fourth switching switch coupled between the second inductor and the second switching switch and paralleling a fourth diode . The bidirectional DC/DC voltage conversion device of claim 4, wherein when the voltages of the first capacitor and the second capacitor are unbalanced, the second switch is turned on and the fourth switch is turned off. The second power storage unit is charged by the second current through the second switch and the second inductor. A bidirectional DC/DC voltage conversion device includes: a first power storage unit; a first bidirectional non-isolated conversion circuit coupled to a first pole of the first power storage unit; and a first capacitor coupled to the first two-way Non-isolated conversion circuit; a second bidirectional non-isolated switching circuit coupled to the second pole of the first power storage unit and the first bidirectional non-isolated switching circuit; a second capacitor coupled to the second bidirectional non-isolated switching circuit and the first And a grounding line coupled between the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit, and between the first capacitor and the second capacitor; wherein, the first capacitor When the voltage of the second capacitor is unbalanced, the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit operate in a buck mode to cause a first current flowing into the first capacitor to pass through The first bidirectional non-isolated switching circuit charges the first power storage unit, and causes a second current flowing into the second capacitor to pass through the second bidirectional non-isolated switching circuit to charge the second power storage unit to Balancing the voltage of the first capacitor and the second capacitor. The bidirectional DC/DC voltage conversion device of claim 6, wherein the first bidirectional non-isolated conversion circuit comprises: a first inductor coupled to the first pole of the first power storage unit; and a first switch a switch, coupled to the first inductor, and a first diode connected in parallel; and a third switch coupled between the first inductor and the first switch, and a third diode connected in parallel; The second bidirectional non-isolated switching circuit includes: a second switching switch coupled to the second pole of the first power storage unit and a second diode connected in parallel; and a fourth switching switch coupled to the second A bidirectional non-isolated switching circuit is coupled between the second switching switch and a fourth diode. A bidirectional DC/DC voltage conversion device includes: a first power storage unit; a first bidirectional isolation conversion circuit coupled to the first power storage unit; a first capacitor coupled to the first bidirectional isolation conversion circuit; a second power storage unit; a second bidirectional isolation conversion circuit coupled to the second power storage unit; a second capacitor coupled to the second bidirectional isolation conversion circuit; and a transmission line coupled to the first capacitor and the second Between the capacitors, wherein the first bidirectional isolation conversion circuit and the second bidirectional isolation conversion circuit operate in a voltage conversion mode when the voltage of the first capacitor and the second capacitor are unbalanced, so that Passing a first current flowing into the first capacitor through the first bidirectional isolation conversion circuit to charge the first power storage unit, and causing a second current flowing into the second capacitor to pass through the second bidirectional isolation conversion circuit, and The second power storage unit is charged to balance the voltages of the first capacitor and the second capacitor. A bidirectional DC/DC voltage conversion device includes: a first power storage unit; a first bidirectional isolation conversion circuit coupled to the first power storage unit; a first capacitor coupled to the first bidirectional isolation conversion circuit; a second bidirectional isolation conversion circuit coupled to the first power storage unit; a second capacitor coupled to the second bidirectional isolation conversion circuit; and a transmission line coupled between the first capacitor and the second capacitor; When the voltages of the first capacitor and the second capacitor are unbalanced, the first bidirectional isolation conversion circuit and the second bidirectional isolation conversion circuit operate in a voltage conversion mode to make a flow into the first capacitor. The first current is charged by the first bidirectional isolation conversion circuit, and the first power storage unit is charged The second current of the second capacitor is charged to the second power storage unit via the second bidirectional isolation conversion circuit to balance the voltages of the first capacitor and the second capacitor. A bidirectional DC/DC voltage conversion device includes: a first power storage unit; a bidirectional isolation conversion circuit coupled to the first power storage unit; a storage capacitor coupled to the bidirectional isolation conversion circuit; and a first bidirectional non-isolated conversion The circuit is coupled to the storage capacitor; a first capacitor coupled to the first bidirectional non-isolated converter circuit; and a second bidirectional non-isolated converter circuit coupled between the storage capacitor and the first bidirectional non-isolated converter circuit; And a second capacitor coupled to the second bidirectional non-isolated switching circuit and the first capacitor; and a ground line coupled between the first bidirectional non-isolated switching circuit and the second bidirectional non-isolated switching circuit, Between the first capacitor and the second capacitor; wherein, when the voltages of the first capacitor and the second capacitor are unbalanced, the bidirectional isolation conversion circuit operates in a voltage conversion mode, and the first bidirectional The non-isolated switching circuit and the second bidirectional non-isolated switching circuit operate in a buck mode such that a first current flowing into the first capacitor passes through the first bidirectional non-isolated switching circuit, The storage capacitor and the bidirectional isolation conversion circuit charge the first power storage unit, and pass a second current flowing into the second capacitor through the second bidirectional non-isolated conversion circuit, the storage capacitor and the bidirectional isolation conversion circuit And charging the first power storage unit to balance the voltages of the first capacitor and the second capacitor. The bidirectional DC/DC voltage conversion device of claim 10, wherein the first bidirectional non-isolated conversion circuit comprises: a first inductor is coupled to a first pole of the first power storage unit; a first switch is coupled to the first inductor, and a first diode is connected in parallel; and a third switch is coupled to the first inductor Between the first inductor and the first switch, and a third diode connected in parallel; and the second bidirectional non-isolated switch circuit includes: a second switch coupled to a second of the first power storage unit a second diode is connected in parallel with the second diode; and a fourth switching switch is coupled between the first bidirectional non-isolated switching circuit and the second switching switch, and a fourth diode is connected in parallel.