CN209787068U - Synchronous rectification step-down bidirectional conversion circuit and intelligent battery - Google Patents
Synchronous rectification step-down bidirectional conversion circuit and intelligent battery Download PDFInfo
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- CN209787068U CN209787068U CN201821898300.6U CN201821898300U CN209787068U CN 209787068 U CN209787068 U CN 209787068U CN 201821898300 U CN201821898300 U CN 201821898300U CN 209787068 U CN209787068 U CN 209787068U
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Abstract
The utility model relates to the technical field of batteries, in particular to a synchronous rectification voltage reduction bidirectional conversion circuit and an intelligent battery, the synchronous rectification voltage-reduction bidirectional conversion circuit comprises a first port, a second port and a third port, and a protection circuit, an H-bridge circuit and an intelligent control chip, wherein the protection circuit can be switched on or off under the control of the intelligent control chip to realize the charge and discharge protection of the rechargeable battery, the H-bridge circuit is used for carrying out voltage reduction processing on the output voltage or the charging voltage of the rechargeable battery under the control of the intelligent control chip, the synchronous rectification voltage reduction bidirectional conversion circuit can reduce the output voltage of the rechargeable battery, and can reduce the external voltage to charge the rechargeable battery, so that double-voltage output and double-voltage input of the rechargeable battery can be realized, and the use scene of the rechargeable battery is widened.
Description
Technical Field
the utility model relates to a battery technology field particularly, relates to a synchronous rectification step-down bidirectional conversion circuit and intelligent battery.
Background
the battery is widely applied to various digital products, living electric appliances, instruments, toys and other products, and the quantity and types of the applied battery are more and more along with the improvement of the living standard of people. In many application modes, the battery needs to be charged through a charger or a charging seat, and the most basic and important requirement is to ensure the personal and property safety of the user. With the increase of battery materials and voltage types, the potential safety hazard in the battery charging process is increased rapidly, for example, dry batteries, nickel-hydrogen batteries, nickel-cadmium batteries and novel step-down batteries, because the general requirements implement the same standard, the external dimensions and electrode arrangement are completely the same, if dry batteries of a low-voltage system or nickel-hydrogen batteries and nickel-cadmium batteries are loaded in a charger with high voltage output, charging overvoltage and overcurrent can be caused, the batteries and charging equipment are damaged, even fire disasters or explosion and other serious consequences endangering life and property safety are caused by heating and burning.
How to avoid the above-mentioned safety risks, it is not possible to hope that the user will not misload the battery, since this misloading may occur with little chance due to negligence or lack of knowledge of others, which requires technical precautions. The related art is currently an intelligent charger or a digital battery system. However, the existing intelligent charger or digital battery system is not perfect in function and cannot be used in various situations.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a synchronous rectification buck bidirectional conversion circuit and an intelligent battery, so as to improve the above problems.
The utility model adopts the technical scheme as follows:
The utility model provides a synchronous rectification step-down bidirectional conversion circuit, which comprises an intelligent control chip, a protection circuit, an H bridge circuit, a first port, a second port and a third port; the first port is used for being electrically connected with a battery to provide an input power supply for the synchronous rectification step-down bidirectional conversion circuit; the protection circuit is arranged between the first port and the second port, is electrically connected with the intelligent control chip, and is used for providing charge-discharge protection for the synchronous rectification step-down bidirectional conversion circuit under the control of the intelligent control chip; the H bridge circuit is connected protection circuit with between the third port, with intelligent control chip electric connection, the third port is used for connecting external equipment, when connecting external equipment for consumer, H bridge circuit is in step-down to the output voltage of third port under intelligent control chip's the control, when connecting external equipment for power supply unit, H bridge circuit is in step-down to the input voltage of third port under intelligent control chip's the control.
Further, the protection circuit comprises a first switch tube and a second switch tube, wherein a source electrode of the first switch tube is electrically connected with the first port, a drain electrode of the first switch tube is connected with a source electrode of the second switch tube, a source electrode of the second switch tube is electrically connected with the second port, and grid electrodes of the first switch tube and the second switch tube are respectively connected with an I/O port of the intelligent control chip so as to be switched on or off under the control of the intelligent control chip, so that overcurrent and overvoltage protection is provided when the rechargeable battery enters a charging state or a discharging state.
Further, the H-bridge circuit includes a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube and an inductor, the third switching tube is connected in series with the fourth switching tube, the gates of the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all electrically connected to the intelligent control chip, so as to be turned on or turned off under the control of the intelligent control chip, the source of the third switching tube is connected to the second port, the drain of the fourth switching tube is electrically connected to the drain of the third switching tube, the source of the fifth switching tube is connected to the third port, the drain of the sixth switching tube is connected to the drain of the fifth switching tube, one end of the inductor is connected to the drain of the third switching tube, the other end of the inductor is connected to the drain of the fifth switching tube, and the third switching tube and the fourth switching tube are used for reducing the output of the rechargeable battery under the control of the intelligent control chip And the fifth switching tube and the sixth switching tube are used for carrying out voltage reduction processing on the input of the rechargeable battery.
Further, the intelligent control chip comprises a first feedback pin, and when the first feedback pin detects that the voltage value of the third port is greater than a first preset value, the intelligent control chip controls the synchronous rectification step-down bidirectional conversion circuit to enter a charging mode to connect an external power supply device to charge the rechargeable battery.
Further, the first preset value is 4.3V.
Further, the synchronous rectification step-down bidirectional conversion circuit further comprises an indicator light module, wherein the indicator light module is connected with the intelligent control chip and used for displaying different states of the rechargeable battery under the control of the intelligent control chip through light.
Furthermore, the synchronous rectification step-down bidirectional conversion circuit further comprises a touch switch key, and the touch switch key is connected with the intelligent control chip and used for responding to touch operation of a user to control the on or off of the indicator light module.
Further, the synchronous rectification step-down bidirectional conversion circuit further comprises a temperature management module, the temperature management module is connected with the intelligent control chip, the temperature management module is used for detecting the temperature of the rechargeable battery and sending the detected temperature value to the intelligent control chip, and the intelligent control chip enables the synchronous rectification step-down bidirectional conversion circuit to enter a protection mode when the detected temperature is higher than a preset value.
An intelligent battery comprises a rechargeable battery and a synchronous rectification step-down bidirectional conversion circuit, wherein the synchronous rectification step-down bidirectional conversion circuit is used for assisting the charging and discharging of the rechargeable battery, and comprises an intelligent control chip, a protection circuit, an H bridge circuit, a first port, a second port and a third port; the first port is used for being electrically connected with a battery to provide an input power supply for the synchronous rectification step-down bidirectional conversion circuit; the protection circuit is arranged between the first port and the second port, is electrically connected with the intelligent control chip, and is used for providing charge-discharge protection for the synchronous rectification step-down bidirectional conversion circuit under the control of the intelligent control chip; the H bridge circuit is connected protection circuit with between the third port, with intelligent control chip electric connection, the third port is used for connecting external equipment, when connecting external equipment for consumer, H bridge circuit is in the output voltage to the third port under intelligent control chip's the control steps down, when connecting external equipment for power supply unit, H bridge circuit is in the input voltage to the third port steps down under intelligent control chip's the control, rechargeable battery's positive pole with first port is connected, rechargeable battery's negative pole ground connection.
Further, the rechargeable battery is a lithium battery.
Compared with the prior art, the utility model discloses following beneficial effect has:
The utility model provides a pair of synchronous rectification step-down bidirectional conversion circuit and intelligent battery, synchronous rectification step-down bidirectional conversion circuit includes first port, second port, third port to and protection circuit, H bridge circuit and intelligent control chip, protection circuit can switch on or turn-off under intelligent control chip's control, realizes the charge-discharge protection to rechargeable battery, H bridge circuit is used for carrying out the step-down processing to rechargeable battery's output voltage, or charging voltage under intelligent control chip's control, can realize stepping down rechargeable battery's output voltage through synchronous rectification step-down bidirectional conversion circuit, can also step down external voltage for rechargeable battery charges, can realize rechargeable battery's dual voltage output and dual voltage input, has widened rechargeable battery's use scene.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 shows a schematic diagram of a synchronous rectification step-down bidirectional conversion circuit provided by the present invention.
Fig. 2 shows a schematic circuit block diagram of a synchronous rectification buck bidirectional conversion circuit.
Fig. 3 shows a connection schematic of the protection circuit.
Fig. 4 shows a smart battery schematic.
Icon: 100-synchronous rectification step-down bidirectional conversion circuit; 110-intelligent control chip; 120-a protection circuit; 130-H bridge circuit; 140 — a first port; 150-a second port; 160-a third port; q1-first switch tube; q2-second switch tube; q3-third switch tube; q4-fourth switching tube; q5-fifth switch tube; q6-sixth switching tube; 170-indicator light module; 180-touch switch keys; 190-a temperature management module; 200-smart batteries; 210-rechargeable battery.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the product of the present invention is usually placed when in use, and are only for convenience of description, but not for indicating or implying that the indicated synchronous rectification step-down bidirectional conversion circuit or element must have a specific position, be constructed and operated in a specific position, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
In the description of the present invention, it should also be noted that relational terms such as first and second, and the like, may be used solely herein to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
The embodiment of the present invention provides a synchronous rectification step-down bidirectional conversion circuit 100, please refer to fig. 1 and fig. 2, and fig. 1 and fig. 2 show a schematic block diagram of the synchronous rectification step-down bidirectional conversion circuit 100 provided by the embodiment of the present invention. The synchronous rectification buck bidirectional converting circuit 100 is used for performing bidirectional voltage transformation on an electrical signal, in this embodiment, the synchronous rectification buck bidirectional converting circuit 100 may be used for assisting charging and discharging of the rechargeable battery 210 and protecting charging and discharging of the rechargeable battery 210, but is not limited thereto.
The synchronous rectification buck bidirectional conversion circuit 100 includes an intelligent control chip 110, a protection circuit 120, an H-bridge circuit 130, a first port 140, a second port 150, and a third port 160.
The first port 140 is used for electrically connecting with the rechargeable battery 210 to provide an input power for the synchronous rectification step-down bidirectional conversion circuit 100; the protection circuit 120 is disposed between the first port 140 and the second port 150, and is further electrically connected to the intelligent control chip 110, the H-bridge circuit 130 is connected between the protection circuit 120 and the third port 160, and is further electrically connected to the intelligent control chip 110, the third port 160 is used for connecting an external device, and the external device may be an electric device or a power supply device.
Referring to fig. 3, the protection circuit 120 includes a first switch tube Q1 and a second switch tube Q2, a source of the first switch tube Q1 is electrically connected to the first port 140, a drain of the first switch tube Q1 is connected to a source of the second switch tube Q2, a source of the second switch tube Q2 is electrically connected to the second port 150, and gates of the first switch tube Q1 and the second switch tube Q2 are respectively connected to an I/O port of the smart chip 110 to be turned on or off under the control of the smart chip 110.
The H-bridge circuit 130 includes a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, a sixth switching tube Q6, and an inductor L, the third switching tube Q3 is connected in series with the fourth switching tube Q4, gates of the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, and the sixth switching tube Q6 are all electrically connected to the smart chip 110 to be turned on or off under the control of the smart chip 110, a source of the third switching tube Q3 is connected to the second port 150, a drain of the fourth switching tube Q4 is electrically connected to a drain of the third switching tube Q3, a source of the fifth switching tube Q5 is connected to the third port 160, a drain of the sixth switching tube Q6 is connected to a drain of the fifth switching tube Q5, one end of the drain of the inductor L is electrically connected to a drain of the third switching tube Q3, and the other end of the fifth switching tube Q5 is electrically connected to the drain of the inductor L, the third switch tube Q3 and the fourth switch tube Q4 are used for performing voltage reduction processing on the output of the rechargeable battery 210 under the control of the intelligent control chip 110, and the fifth switch tube Q6 and the sixth switch tube Q6 are used for performing voltage reduction processing on the input of the rechargeable battery 210.
The smart control chip 110 includes a plurality of pins, such as a feedback pin, an enable pin, an I \ O pin, and the like. The feedback pin is used for acquiring a feedback signal and sending the feedback signal to the intelligent control chip 110, and the intelligent control chip 110 performs corresponding processing according to the feedback signal. For example, the smart controller chip 110 in this embodiment includes a first feedback pin FB1, and the first feedback pin FB1 is used for detecting the voltage value of the third port 160 and sending the detected voltage value as a feedback signal to the smart controller chip 110. In this embodiment, the first feedback pin FB1 can be used for buck feedback, mode identification, and auxiliary power supply. When the voltage value of the third port 160 is greater than the first preset value, the intelligent control chip 110 controls the synchronous rectification buck bidirectional conversion circuit 100 to enter a charging state, and when the voltage value of the third port 160 is less than the first preset value, the intelligent control chip 110 controls the synchronous rectification buck bidirectional conversion circuit 100 to enter a buck state.
In this embodiment, the first predetermined value is 4.3V.
When the voltage value of the third port 160 is less than 4.3V, the intelligent control chip 110 controls the synchronous rectification buck bidirectional conversion circuit 100 to enter a buck mode, the intelligent control chip 110 controls the protection circuit 120 to be turned on, so that the rechargeable battery 210 can output an electrical signal, the electrical signal output by the rechargeable battery 210 is transmitted to the H-bridge circuit 130 through the protection circuit 120, in the buck mode, the third switching tube Q3 and the fourth switching tube Q4 are upper and lower switching tubes, the fifth switching tube Q5 is normally on, the sixth switching tube Q6 is normally off, the third port 160 is connected with the first capacitor C1, the intelligent control chip 110 controls the third switching tube Q3 and the fourth switching tube Q4 to be intermittently turned on to charge at two ends of the first capacitor C1, and when the intelligent control chip 110 controls the third switching tube Q3 and the fourth switching tube Q4 to be intermittently turned off, the electric energy stored in the first capacitor C1 is discharged, so that the voltage output by the rechargeable battery 210 is reduced and then output through the third port 160. In this embodiment, the smart controller chip 110 controls the third switch Q3 and the fourth switch Q4 to be turned on or off intermittently, so that the output voltage of the third port 160 is maintained at a first voltage value, which is 1.5V in this embodiment, but not limited thereto.
In other embodiments of the present invention, the rechargeable battery 210 can also directly output a voltage of a second voltage value through the protection circuit 120 and the second port 150, where the second voltage value is a nominal voltage of the rechargeable battery, and is generally 3.7V, but not limited thereto.
When the voltage value of the third port 160 is greater than 4.3V, the intelligent control chip 110 controls the synchronous rectification buck bidirectional conversion circuit 100 to enter a charging mode, and connects an external power supply device to charge the rechargeable battery 210.
Generally, the charging voltage of the rechargeable battery 210 should not be greater than 4.5V, and in the embodiment, it is preferably set to 4.2V to 4.35V, and when the charging voltage is greater than 4.5V, for example, 5V, the battery cell may be damaged. Therefore, the synchronous rectification buck bidirectional conversion circuit 100 provided by the present embodiment is used for stepping down the charging voltage to realize safe charging when the voltage of the power supply device connected to the rechargeable battery 210 is greater than 4.5V.
similar to the buck mode, the buck in the charge mode is mainly accomplished by the H-bridge circuit 130. The difference from the buck mode is that when the synchronous rectification buck bidirectional conversion circuit 100 is in the charging mode, the buck is completed by the fourth switching tube Q4 and the fifth switching tube Q5. The voltage provided by the power supply device is reduced by the H-bridge circuit 130, and is input to the rechargeable battery 210 for charging through the protection circuit 120.
It should be noted that, in the charging mode, the conducting direction of the protection circuit 120 under the control of the smart control chip 110 is opposite to the conducting direction of the protection circuit 120 in the voltage reduction mode.
In the charging mode, the fifth switching tube Q5 and the sixth switching tube Q6 are upper and lower tubes, the third switching tube Q3 is normally on, and the fourth switching tube Q4 is off. The second port 150 is connected to ground through a second capacitor C2 to smooth the charging voltage dropped by the H-bridge circuit 130.
The intelligent control chip 110 further includes a second feedback pin FB2, and the second feedback pin FB2 is connected to the second port 150, and is configured to collect a charging voltage as a feedback signal during charging, so that the intelligent control chip 110 adjusts on-off time of the fifth switching tube Q5 and the sixth switching tube Q6 according to the feedback signal, so as to keep the charging voltage within a reasonable range.
In this embodiment, the switch transistor may be a MOS transistor.
For example, in the charging mode, a pre-charge-constant current-constant voltage charging mode is adopted, the intelligent control chip 110 collects a cell voltage value of the rechargeable battery 210 through the I/O port, and determines a charging current value according to a current value flowing through the protection circuit 120. When the cell voltage value is less than 2.9V, the pre-charging stage is entered, and the pre-charging is performed with a charging current of 1/10, and when the cell voltage is greater than 2.9V, the constant current charging stage is entered, and the intelligent control chip 110 controls the H-bridge circuit 130 to adjust the charging voltage so as to keep the charging current in a constant state. And when the cell voltage reaches 4.5V, switching to a constant-voltage charging stage, keeping the charging voltage constant, and continuously reducing the charging current.
In the charging process, the magnitude of the charging current may be set by the RST pin of the intelligent control chip 110, a resistor may be connected to the RST pin, and the magnitude of the current at the RST pin end may be changed by changing the resistance of the resistor.
The synchronous rectification step-down bidirectional conversion circuit 100 further comprises an indicator light module 170, and the indicator light module 170 is connected with the intelligent control chip 110 and is used for displaying different states of the rechargeable battery by light under the control of the intelligent control chip 110. The indicator module 170 may be an LED or the like, and when the battery is full of electricity, the LED is usually on, and when the battery output is abnormal, the LED is flashing.
In this embodiment, the synchronous rectification and voltage reduction bidirectional conversion circuit 100 further includes a touch switch button 180, and the touch switch button 180 is connected to the intelligent control chip 110 and configured to respond to a touch operation of a user to control the turning on or off of the indicator light module 170. For example, when the user presses the touch switch button 180, the smart control chip 110 controls the indicator light module 170 to start, so as to display the battery status.
The synchronous rectification step-down bidirectional conversion circuit 100 further comprises a temperature management module 190, the temperature management module 190 is connected with the intelligent control chip 110, the temperature management module 190 is used for detecting the temperature of the rechargeable battery 210 and sending the detected temperature value to the intelligent control chip 110, and the intelligent control chip enables the synchronous rectification step-down bidirectional conversion circuit to enter a protection mode when the temperature value is higher than a preset value.
For example, when the temperature is higher than the first temperature value, the intelligent control chip 110 limits and reduces the on-state duty ratio of the switching tube in the over-temperature phase, so that the output current and the output power of the rechargeable battery 210 are limited.
When the temperature is higher than the second temperature value, the intelligent control chip 110 controls to turn off the switching tube of the protection circuit 120, and stops outputting to the outside to protect the rechargeable battery 210.
Second embodiment
Referring to fig. 4, the present embodiment provides an intelligent battery 200, where the intelligent battery 200 includes a rechargeable battery and the synchronous rectification buck bidirectional conversion circuit 100 as described in the first embodiment, the synchronous rectification buck bidirectional conversion circuit 100 includes a first port 140, a positive electrode of the rechargeable battery 210 is connected to the first port 140, and a negative electrode of the rechargeable battery 210 is grounded.
In this embodiment, the rechargeable battery 210 may be a lithium battery, but is not limited thereto, and may also be another rechargeable battery 210.
In summary, the utility model provides a synchronous rectification step-down bidirectional conversion circuit and an intelligent battery, wherein the synchronous rectification step-down bidirectional conversion circuit comprises an intelligent control chip, a protection circuit, an H bridge circuit, a first port, a second port and a third port; the first port is used for being electrically connected with a battery to provide an input power supply for the synchronous rectification step-down bidirectional conversion circuit; the protection circuit is arranged between the first port and the second port, is electrically connected with the intelligent control chip, and is used for providing charge-discharge protection for the synchronous rectification step-down bidirectional conversion circuit under the control of the intelligent control chip; the H bridge circuit is connected protection circuit with between the third port, with intelligent control chip electric connection, the third port is used for connecting external equipment, when connecting external equipment for consumer, H bridge circuit is in step-down to the output voltage of third port under intelligent control chip's the control, when connecting external equipment for power supply unit, H bridge circuit is in step-down to the input voltage of third port under intelligent control chip's the control. Through the utility model provides a synchronous rectification step-down bidirectional conversion circuit can realize the protection to rechargeable battery charging, discharge process, and nominal charging voltage that not only can rechargeable battery charges, can also charge at other voltage values, for example 5V. The rechargeable battery can provide nominal voltage output, and also can provide output after the voltage of the synchronous rectification voltage-reduction bidirectional conversion circuit is reduced, so that double-voltage charging and double-voltage output are realized, the safety coefficient of the rechargeable battery is improved, the use scene of the rechargeable battery is widened, and great economic benefit can be generated.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A synchronous rectification step-down bidirectional conversion circuit is characterized by comprising an intelligent control chip, a protection circuit, an H bridge circuit, a first port, a second port and a third port;
The first port is used for being electrically connected with a battery to provide an input power supply for the synchronous rectification step-down bidirectional conversion circuit;
The protection circuit is arranged between the first port and the second port, is electrically connected with the intelligent control chip, and is used for providing charge-discharge protection for the synchronous rectification step-down bidirectional conversion circuit under the control of the intelligent control chip;
The H bridge circuit is connected protection circuit with between the third port, with intelligent control chip electric connection, the third port is used for connecting external equipment, when connecting external equipment for consumer, H bridge circuit is in step-down to the output voltage of third port under intelligent control chip's the control, when connecting external equipment for power supply unit, H bridge circuit is in step-down to the input voltage of third port under intelligent control chip's the control.
2. The synchronous rectification buck bidirectional conversion circuit as claimed in claim 1, wherein the protection circuit comprises a first switch tube and a second switch tube, a source of the first switch tube is electrically connected to the first port, a drain of the first switch tube is connected to a source of the second switch tube, a source of the second switch tube is electrically connected to the second port, and gates of the first switch tube and the second switch tube are respectively connected to an I/O port of the intelligent control chip to be turned on or off under control of the intelligent control chip, so as to provide overcurrent and overvoltage protection when the rechargeable battery enters a charging state or a discharging state.
3. The synchronous rectification buck two-way conversion circuit as claimed in claim 2, wherein the H-bridge circuit includes a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube and an inductor, the third switching tube and the fourth switching tube are connected in series, gates of the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all electrically connected to the smart control chip to be turned on or off under the control of the smart control chip, a source of the third switching tube is connected to the second port, a drain of the fourth switching tube is electrically connected to a drain of the third switching tube, a source of the fifth switching tube is connected to the third port, a drain of the sixth switching tube is connected to a drain of the fifth switching tube, and one end of the inductor is connected to a drain of the third switching tube, the other end of the third switch tube is connected with the drain electrode of the fifth switch tube, the third switch tube and the fourth switch tube are used for carrying out voltage reduction processing on the output of the rechargeable battery under the control of the intelligent control chip, and the fifth switch tube and the sixth switch tube are used for carrying out voltage reduction processing on the input of the rechargeable battery.
4. The synchronous rectification buck bi-directional conversion circuit as claimed in claim 3, wherein the intelligent control chip comprises a first feedback pin, and when the first feedback pin detects that the voltage value at the third port is greater than a first preset value, the intelligent control chip controls the synchronous rectification buck bi-directional conversion circuit to enter a charging mode to connect an external power supply device to charge the rechargeable battery.
5. the synchronous rectification buck bi-directional conversion circuit as claimed in claim 4, wherein the first predetermined value is 4.3V.
6. The synchronous rectification buck two-way conversion circuit as claimed in claim 1, further comprising an indicator light module, connected to the intelligent control chip, for displaying different states of the rechargeable battery with light under the control of the intelligent control chip.
7. The synchronous rectification buck bidirectional conversion circuit as claimed in claim 6, further comprising a touch switch button, connected to the intelligent control chip, for controlling the turning on or off of the indicator light module in response to a touch operation of a user.
8. The synchronous rectification buck two-way conversion circuit as claimed in claim 1, further comprising a temperature management module, wherein the temperature management module is connected to the intelligent control chip, the temperature management module is configured to detect a temperature of the rechargeable battery and send a detected temperature value to the intelligent control chip, and the intelligent control chip enables the synchronous rectification buck two-way conversion circuit to enter a protection mode when the detected temperature is higher than a preset value.
9. An intelligent battery, wherein the intelligent battery comprises a rechargeable battery and the synchronous rectification buck bidirectional conversion circuit as claimed in any one of claims 1 to 8, the synchronous rectification buck bidirectional conversion circuit comprises a first port, the positive electrode of the rechargeable battery is connected to the first port, and the negative electrode of the rechargeable battery is grounded.
10. The smart battery of claim 9, wherein the rechargeable battery is a lithium battery.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245595A (en) * | 2018-11-16 | 2019-01-18 | 广州市金特电子科技有限公司 | Synchronous rectification reducing two-way translation circuit and intelligent battery |
| CN110994743A (en) * | 2019-12-27 | 2020-04-10 | 北京兴达智联科技有限公司 | Controlled battery pack device and charge-discharge control method thereof |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245595A (en) * | 2018-11-16 | 2019-01-18 | 广州市金特电子科技有限公司 | Synchronous rectification reducing two-way translation circuit and intelligent battery |
| CN110994743A (en) * | 2019-12-27 | 2020-04-10 | 北京兴达智联科技有限公司 | Controlled battery pack device and charge-discharge control method thereof |
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