Bidirectional charging and discharging circuit

Abstract

A bidirectional charging and discharging circuit. The bidirectional charging and discharging circuit comprises a bidirectional DC / DC conversion module (11), a first power supply module (12), a second power supply module (13), a third power supply module (14), a DSP module (15), and a driving module (16), wherein a first end of the bidirectional DC / DC conversion module (11) is connected to an external DC, and a second end of the bidirectional DC / DC conversion module (11) is connected in parallel to two ends of a battery; the two ends of the battery are connected in parallel to a first end of the first power supply module (12), and a second end of the first power supply module (12) is connected in parallel to a first end of the third power supply module (14); a second end of the third power supply module (14) is connected in parallel to a first end of the DSP module (15); a second end of the DSP module (15) is connected in parallel to a first end of the driving module (16); a second end of the driving module (16) is connected in parallel to a third end of the bidirectional DC / DC conversion module (11); the two ends of the battery are connected in parallel to a first end of the second power supply module (13), and a second end of the second power supply module (13) is connected in parallel to a third end of the driving module (16).

Description

Bidirectional charge and discharge circuit

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on February 22, 2024, with application number 2024203261407 and invention name “A Bidirectional Charging and Discharging Circuit”. The entire contents of the patent application are incorporated into this disclosure by reference. Technical Field

[0003] The present disclosure relates to the technical field of lighting equipment, and in particular to a bidirectional charging and discharging circuit. Background Art

[0004] Existing energy storage devices can use lithium batteries to output power to power devices. After the lithium battery power is exhausted, an external power source is needed to recharge the lithium battery pack. Among them, the bidirectional charge and discharge circuit is the key circuit of the energy storage device.

[0005] Summary of the Invention

[0006] An embodiment of the present disclosure provides a bidirectional charge and discharge circuit, comprising: a bidirectional DC / DC conversion module, a first power supply module, a second power supply module, a third power supply module, a DSP module, and a drive module, wherein the first end of the bidirectional DC / DC conversion module is connected to an external DC power, and the second end of the bidirectional DC / DC conversion module is connected in parallel to the two ends of a battery; the two ends of the battery are connected in parallel to the first end of the first power supply module, the second end of the first power supply module is connected in parallel to the first end of the third power supply module, the second end of the third power supply module is connected in parallel to the first end of the DSP module, the second end of the DSP module is connected in parallel to the first end of the drive module, and the second end of the drive module is connected in parallel to the third end of the bidirectional DC / DC conversion module; the two ends of the battery are connected in parallel to the first end of the second power supply module, and the second end of the second power supply module is connected in parallel to the third end of the drive module.

[0007] In some embodiments, the bidirectional charge and discharge circuit further includes a sampling module, wherein a first terminal of the sampling module is connected in parallel to a fourth terminal of the bidirectional DC / DC conversion module, and a second terminal of the sampling module is connected in parallel to a third terminal of the DSP module.

[0008] In some embodiments, the bidirectional DC / DC conversion module includes: a first switch, a second switch, a first inductor, a first capacitor, and a second capacitor. The positive terminal of the first end of the bidirectional DC / DC conversion module is connected to the drain of the first switch and the first end of the first capacitor, the source of the first switch is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the second end of the first capacitor, the drain of the second switch is connected to the first end of the first inductor, the source of the second switch is connected to the second end of the first capacitor, the second end of the first inductor is connected to the positive terminal of the battery, and the second end of the second capacitor is connected to the negative terminal of the battery.

[0009] In some embodiments, the bidirectional DC / DC conversion module further includes: a first resistor and a second resistor, wherein the first end of the first resistor is connected to the positive terminal of the first end of the bidirectional DC / DC conversion module, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the negative terminal of the first end of the bidirectional DC / DC conversion module.

[0010] In some embodiments, the bidirectional DC / DC conversion module further includes: a third resistor and a fourth resistor, wherein the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the second end of the first capacitor; the first end of the fourth resistor is connected to the second end of the second capacitor, and the second end of the fourth resistor is connected to the negative pole of the battery.

[0011] In some embodiments, the bidirectional DC / DC conversion module further includes: a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is connected to the second end of the first inductor, the second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the negative pole of the battery.

[0012] In some embodiments, the bidirectional DC / DC conversion module further includes: a seventh resistor and a third capacitor, wherein the first end of the seventh resistor is connected to the positive electrode of the battery, the second end of the seventh resistor is connected to the first end of the third capacitor, and the second end of the third capacitor is connected to the negative electrode of the battery.

[0013] In some embodiments, the first power module uses chip SY7072.

[0014] In some embodiments, the second power module uses chip AP3012.

[0015] In some embodiments, the third power module uses chip JW7830-33.

[0016] The details of one or more embodiments of the present disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present disclosure will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the traditional technology, the following briefly introduces the drawings required for use in the embodiments or the description of the traditional technology. Obviously, the drawings described below are only embodiments of the embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without paying any creative work.

[0018] FIG1 is a schematic structural diagram of a bidirectional charge and discharge circuit provided in some embodiments;

[0019] FIG2 is a schematic diagram of some embodiments of the bidirectional DC / DC conversion module in FIG1 ;

[0020] FIG3 is a schematic diagram of some embodiments of the first power module in FIG1 ;

[0021] FIG4 is a schematic diagram of some embodiments of the second power module in FIG1 ;

[0022] FIG. 5 is a schematic diagram of some embodiments of the third power module in FIG. 1 . DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of the embodiments of the present disclosure in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the embodiments of the present disclosure.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0025] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0026] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0027] [Corrected 08.01.2025 according to Rule 91] Please refer to Figures 1 to 5 to understand that in some embodiments, a bidirectional charge and discharge circuit is provided. The bidirectional charge and discharge circuit includes: a bidirectional DC / DC conversion module 11, a first power module 12, a second power module 13, a third power module 14, a DSP module 15, a drive module 16, and a sampling module 17. The first end of the bidirectional DC / DC conversion module 11 includes a terminal V O1+ With terminal V O1- The first end of the bidirectional DC / DC conversion module 11 is connected to the external DC power supply, and the second end of the bidirectional DC / DC conversion module 11 is connected in parallel to the two ends of the battery BT, and the positive terminal of the battery BT is the terminal V B+ , the negative terminal of battery BT is V B- Both ends of the battery BT are connected in parallel to the first end of the first power module 12, and the second end of the first power module 12 includes a terminal V O2+ With terminal V O2- The second end of the first power module 12 is connected in parallel to the first end of the third power module 14, and the second end of the third power module 14 includes a terminal V O5+ With terminal V O5- The second end of the third power module 14 is connected in parallel to the first end of the DSP module 15, the second end of the DSP module 15 is connected in parallel to the first end of the driving module 16, and the second end of the driving module 16 is connected in parallel to the third end of the bidirectional DC / DC conversion module 11; the two ends of the battery BT are connected in parallel to the first end of the second power module 13, and the second end of the second power module 13 includes the terminal V O4+ With terminal V O4- The second end of the second power supply module 13 is connected in parallel to the third end of the driving module 16; the first end of the sampling module 17 is connected in parallel to the fourth end of the bidirectional DC / DC conversion module 11, and the second end of the sampling module 17 is connected in parallel to the third end of the DSP module 15.

[0028] For example, when the battery BT is discharged, the voltage V B After being converted into a DC voltage V by the bidirectional DC / DC conversion module 11 O1output to external electrical equipment; when charging the battery BT, the external DC power is converted by the bidirectional DC / DC conversion module 11 and output to the battery BT, thereby realizing bidirectional transmission of electrical energy.

[0029] For example, the first power module 12 converts the voltage V B Converted to voltage V O2 Output to the third power module 14, and then converted into voltage V by the third power module 14 O5 , which supplies power to the DSP module 15. The DSP module 15 generates a driving signal which drives the switch in the bidirectional DC / DC conversion module 11 through the driving module 16 to adjust the output voltage.

[0030] For example, the first power module 12 can also convert the voltage V B Converted to voltage V O3 , voltage V O3 It can power external low-power devices, such as communication units (DTUs).

[0031] For example, the second power module 13 converts the voltage V B Converted to voltage V O4 Provides power to the drive module 16.

[0032] For example, the sampling module 17 samples the voltage and current information in the bidirectional DC / DC conversion module 11 and outputs the samples to the DSP module 15 so that the DSP module 15 processes the voltage and current information to adjust the driving signal.

[0033] In some embodiments, the driving module 16 includes a driving chip, the model of which may be JW9610.

[0034] Please continue to refer to FIG. 2 . In some embodiments, the terminal V O1+ Connect the drain of switch Q1 to the first end of capacitor C1, the source of switch Q1 to the first end of inductor L1, the second end of capacitor C1 to ground, the second end of inductor L1 to the first end of capacitor C2, the second end of capacitor C2 to ground, the drain of switch Q2 to the first end of inductor L1, the source of switch Q2 to ground, the second end of inductor L1 to the first end of fuse F1, and the second end of fuse F1 to terminal V B+ .

[0035] For example, the first end of the resistor R1 is connected to the terminal V O1+ The second end of the resistor R1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the terminal V O1- , terminal V O1- The first end of the resistor R3 is connected, and the second end of the resistor R3 is connected to the second end of the capacitor C1.

[0036] For example, the first end of the resistor R5 is connected to the second end of the inductor L1, the second end of the resistor R5 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to the terminal V B- The first end of the resistor R4 is connected to the second end of the capacitor C2, and the second end of the resistor R4 is connected to the terminal V B- The first end of the resistor R7 is connected to the first end of the fuse F1, the second end of the resistor R7 is connected to the first end of the capacitor C3, and the second end of the capacitor C3 is connected to the terminal V B- .

[0037] For example, the resistor R3 and the resistor R4 are current sampling resistors. The current flowing through the resistor R3 and the resistor R4 is amplified by the operational amplifier in the sampling module 17 and then fed back to the DSP module 15 so that the DSP module 15 can process it.

[0038] For example, the resistors R1 and R2 are used to detect the voltage at the first end of the bidirectional DC / DC conversion module 11 , which is filtered by the RC filter in the sampling module 17 and fed back to the DSP module 15 for processing.

[0039] For example, the switches Q1 and Q2 may be N-type MOSFETs.

[0040] For example, resistors R5 and R6 are used to detect the voltage at the second end of the bidirectional DC / DC conversion module 11 , which is filtered by the RC filter in the sampling module 17 and fed back to the DSP module 15 for processing.

[0041] For example, the resistor R7 and the capacitor C3 function to reduce the peak when the battery BT is connected.

[0042] Please refer to FIG. 3 to understand that in some embodiments, the first power module 12 plays a role of boosting the voltage V of the battery BT. B Increase to voltage V O2 and voltage V O3 Output.

[0043] Please continue to refer to FIG3 . In some embodiments, the first power module 12 uses a chip SY7072. The pin LX of the chip SY7072 is connected to the terminal V via the inductor L2. B+ , terminal V B+ Through the capacitor C4 to ground, terminal V B+ The GND pin of the chip SY7072 is connected to the ground through the capacitor C5, and the IN pin of the chip SY7072 is connected to the terminal V B+, pin IN of chip SY7072 is grounded through capacitor C6, pin EN of chip SY7072 is grounded through capacitor C6, pin OUT of chip SY7072 is connected to the first end of resistor R8, the second end of resistor R8 is connected to the first end of resistor R9, the second end of resistor R9 is grounded, the second end of resistor R8 is connected to pin FB of chip SY7072, pin OUT of chip SY7072 is connected to the first end of capacitor C7, the second end of capacitor C7 is connected to the second end of resistor R8, pin OUT of chip SY7072 is grounded through capacitor C8, pin OUT of chip SY7072 is grounded through capacitor C9, and pin OUT of chip SY7072 is terminal V O2+ , the OUT pin of the chip SY7072 is connected to the anode of the diode D1, and the cathode of the diode D1 is the terminal V O3+ .

[0044] For example, capacitors C4 and C5 are input capacitors.

[0045] For example, capacitor C6 is a decoupling capacitor of chip SY7072.

[0046] For example, by setting the voltage divider ratio of resistor R8 and resistor R9, the output voltage V can be adjusted. O2 With voltage V O3 At the same time, the output voltage is fed back to the chip SY7072. Capacitor C7 acts as a feedforward.

[0047] For example, capacitors C8 and C9 are output capacitors.

[0048] Please refer to FIG. 4 to understand that in some embodiments, the second power module 13 plays a role of boosting the voltage V of the battery BT. B Increase to voltage V O4 Output.

[0049] Please continue to refer to FIG4 . In some embodiments, the second power module 13 uses a chip AP3012 . The pin VIN of the chip AP3012 is connected to the terminal V B+ , terminal V B+ Through the capacitor C10 to ground, terminal V B+ The pin VIN of the chip AP3012 is connected to the pin SW of the chip AP3012 through the capacitor C11 and the inductor L3. The pin SHDM of the chip AP3012 is connected to the control signal G1 from the DSP module 15 through the resistor R10. The control signal G1 controls the opening or closing of the chip AP3012. The pin SW of the chip AP3012 is also connected to the anode of the diode D2. The cathode of the diode D2 is the terminal V O4+ , terminal V O4+Connect the first end of the resistor R11, the second end of the resistor R11 is connected to the first end of the resistor R12, the second end of the resistor R12 is grounded GND, and the terminal V O4+ Through the capacitor C13 grounded, terminal V O4+ The capacitor C12 is grounded, and the pin GND of the chip AP3012 is grounded. The pin FB of the chip AP3012 is connected to the first end of the resistor R12.

[0050] For example, capacitors C10 and C11 are input capacitors.

[0051] Illustratively, the diode D2 is a rectifier diode.

[0052] For example, by setting the voltage divider ratio of resistor R11 and resistor R12, the output voltage V can be adjusted. O4 At the same time, the output voltage is fed back to the chip AP3012.

[0053] For example, capacitor C12 and capacitor C13 are output capacitors.

[0054] For example, the resistor R10 is a current limiting resistor.

[0055] Please refer to FIG. 5 to understand that in some embodiments, the third power module 14 plays a role of stepping down the voltage V O2 Reduced to voltage V O5 Output.

[0056] Please continue to refer to FIG5. In some embodiments, the third power module 14 uses a chip JW7830-33, and the pin VIN of the chip JW7830-33 is connected to the terminal V O2+ , the pin VIN of the chip JW7830-33 is grounded through the capacitor C14, the pin VIN of the chip JW7830-33 is grounded through the capacitor C15, and the pin VOUT of the chip JW7830-33 is the terminal V O5+ , the VOUT pin of the chip JW7830-33 is grounded through the capacitor C16, the VOUT pin of the chip JW7830-33 is grounded through the capacitor C17, and the GND pin of the chip JW7830-33 is grounded.

[0057] In some embodiments, the voltage V O1 is 12V, voltage V O2 is 5V, voltage V O3 is 5V, voltage V O4 is 10V, voltage V O5 is 3.3V.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0059] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments merely represent several implementation methods of the embodiments of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art can make several modifications and improvements without departing from the concept of the embodiments of the present disclosure, all of which fall within the scope of protection of the embodiments of the present disclosure. Therefore, the scope of protection of the patent for the embodiments of the present disclosure shall be based on the appended claims.

Claims

1. A bidirectional charge and discharge circuit, comprising: bidirectional DC / DC conversion module, a first power supply module, a second power supply module, a third power supply module, a DSP module and a drive module, The first end of the bidirectional DC / DC conversion module is connected to external DC power, and the second end of the bidirectional DC / DC conversion module is connected in parallel to the two ends of the battery; the two ends of the battery are connected in parallel to the first end of the first power module, the second end of the first power module is connected in parallel to the first end of the third power module, the second end of the third power module is connected in parallel to the first end of the DSP module, the second end of the DSP module is connected in parallel to the first end of the driving module, and the second end of the driving module is connected in parallel to the third end of the bidirectional DC / DC conversion module; the two ends of the battery are connected in parallel to the first end of the second power module, and the second end of the second power module is connected in parallel to the third end of the driving module.

2. A bidirectional charge and discharge circuit according to claim 1, wherein: The bidirectional charge and discharge circuit also includes: A sampling module, wherein a first end of the sampling module is connected in parallel to the fourth end of the bidirectional DC / DC conversion module, and a second end of the sampling module is connected in parallel to the third end of the DSP module.

3. A bidirectional charge and discharge circuit according to claim 2, wherein: The bidirectional DC / DC conversion module includes: a first switch, a second switch, a first inductor, a first capacitor, and a second capacitor; the positive terminal of the first end of the bidirectional DC / DC conversion module is connected to the drain of the first switch and the first end of the first capacitor; the source of the first switch is connected to the first end of the first inductor; the second end of the first inductor is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the second end of the first capacitor; the drain of the second switch is connected to the first end of the first inductor; the source of the second switch is connected to the second end of the first capacitor; the second end of the first inductor is connected to the positive terminal of the battery; and the second end of the second capacitor is connected to the negative terminal of the battery.

4. A bidirectional charge and discharge circuit according to claim 3, wherein: The bidirectional DC / DC conversion module further includes: a first resistor, wherein a first end of the first resistor is connected to a positive terminal of the first end of the bidirectional DC / DC conversion module; A second resistor, wherein the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the negative terminal of the first end of the bidirectional DC / DC conversion module.

5. A bidirectional charge and discharge circuit according to claim 4, wherein: The bidirectional DC / DC conversion module further includes: a third resistor, wherein the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the second end of the first capacitor; a fourth resistor, wherein a first end of the fourth resistor is connected to the second end of the second capacitor, and a second end of the fourth resistor is connected to the negative electrode of the battery.

6. A bidirectional charge and discharge circuit according to claim 5, wherein: The bidirectional DC / DC conversion module further includes: a fifth resistor, wherein a first end of the fifth resistor is connected to the second end of the first inductor; a sixth resistor, wherein the second end of the fifth resistor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the negative electrode of the battery.

7. A bidirectional charge and discharge circuit according to claim 6, wherein: The bidirectional DC / DC conversion module further includes: a seventh resistor, wherein a first end of the seventh resistor is connected to the positive electrode of the battery; A third capacitor, the second end of the seventh resistor is connected to the first end of the third capacitor, and the second end of the third capacitor is connected to the negative electrode of the battery.

8. A bidirectional charge and discharge circuit according to claim 7, wherein: The first power supply module adopts chip SY7072.

9. A bidirectional charge and discharge circuit according to claim 8, wherein: The second power supply module uses the chip AP3012.

10. A bidirectional charge and discharge circuit according to claim 9, wherein: The third power supply module adopts chip JW7830-33.

Images