Charging circuit and charger

Abstract

The utility model discloses a charging circuit and a charger. The charging circuit comprises an interface unit, a switch unit, a control unit and a plurality of AC-DC conversion units. Each AC-DC conversion unit is connected with the interface unit, and each AC-DC conversion unit is used for converting an input first AC signal into a DC signal and outputting the DC signal to the interface unit; the rated powers of the plurality of AC / DC conversion units are different; the switch unit is arranged between the plurality of AC / DC conversion units and the interface unit; the plurality of AC-DC conversion units are connected with the control unit, and the control unit is connected with the switch unit and is used for controlling the conduction state of the switch unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitor voltage equalization, in particular to a charging circuit and a charger. BACKGROUND

[0002] The current market multi-port charger step-down mode is usually to convert the first alternating current signal into a direct current signal, and then input it into multiple BUCK circuits to output direct current signals with different output voltages through secondary conversion of the multiple BUCK circuits. The secondary conversion will cause energy loss, reducing the charging efficiency. CONTENT OF THE INVENTION

[0003] The present application aims to provide a charging circuit to improve the charging efficiency of a traditional charger.

[0004] In a first aspect, the embodiments of the present application provide a charging circuit, comprising:

[0005] an interface unit;

[0006] a plurality of alternating current-direct current conversion units, each of the alternating current-direct current conversion units being connected with the interface unit, each of the alternating current-direct current conversion units being configured to convert an input first alternating current signal into a direct current signal and output the direct current signal to the interface unit, and the rated power of the plurality of alternating current-direct current conversion units being different;

[0007] a switch unit arranged between the plurality of alternating current-direct current conversion units and the interface unit;

[0008] a control unit, the plurality of alternating current-direct current conversion units being connected with the control unit, the control unit being connected with the switch unit, and the control unit being configured to control the conduction state of the switch unit.

[0009] According to some embodiments of the present application, the interface unit comprises at least one interface subunit, and each of the interface subunits is connected with at least one of the alternating current-direct current conversion units through the switch unit.

[0010] According to some embodiments of the present application, the switch unit comprises a plurality of first switch subunits consistent with the number of the interface subunits, and the plurality of first switch subunits and the plurality of interface subunits are correspondingly arranged, each of the first switch subunits being connected with at least one of the alternating current-direct current conversion units.

[0011] According to some embodiments of the present application, the first switch subunit comprises at least one second switch subunit, and each of the second switch subunits is connected with one of the alternating current-direct current conversion units.

[0012] According to some embodiments of the present application, each of the second switch subunits comprises:

[0013] a first MOS transistor, a drain of the first MOS transistor being connected to the AC-DC conversion unit, a gate of the first MOS transistor being connected to the control unit;

[0014] a second MOS transistor, a source of the second MOS transistor being connected to a source of the first MOS transistor, a drain of the second MOS transistor being connected to the interface subunit, a gate of the first MOS transistor being connected to the control unit.

[0015] According to some embodiments of the present application, each of the AC-DC conversion units comprises:

[0016] a voltage transformation subunit, the voltage transformation subunit being connected to the switching subunit, the voltage transformation subunit being configured to reduce a voltage of the first AC signal to obtain a second AC signal;

[0017] a rectification subunit, the rectification subunit being connected to the voltage transformation subunit, the rectification subunit being configured to convert the second AC signal to the DC signal;

[0018] an output regulation subunit, the output regulation subunit being connected to the voltage transformation subunit, the control unit being connected to the output regulation subunit, the output regulation subunit being configured to regulate the DC signal.

[0019] According to some embodiments of the present application, the rectification subunit comprises:

[0020] a fourth MOS transistor, a drain of the fourth MOS transistor being connected to the voltage transformation subunit, a source of the fourth MOS transistor being grounded;

[0021] a fifth MOS transistor, a drain of the fifth MOS transistor being connected to a drain of the fourth MOS transistor, a source of the fifth MOS transistor being grounded;

[0022] a synchronous rectification controller, the synchronous rectification controller being connected to the voltage transformation subunit, a gate of the fourth MOS transistor, and a gate of the fifth MOS transistor, respectively.

[0023] According to some embodiments of the present application, the output regulation subunit comprises:

[0024] an optocoupler, a transmitting positive terminal of the optocoupler being connected to the voltage transformation subunit, a transmitting negative terminal of the optocoupler being connected to the control unit;

[0025] a power management chip, the power management chip being connected to the voltage transformation subunit and a receiving terminal of the optocoupler, respectively.

[0026] According to some embodiments of the present application, the control unit comprises at least one charging protocol chip, and a plurality of charging protocol chips are in communication connection with each other when there are a plurality of charging protocol chips; each AC-DC conversion unit is connected with one charging protocol chip.

[0027] In a second aspect, the embodiments of the present application provide a charger comprising the charging circuit as described above.

[0028] In the embodiments of the present application, the on-off state of the switch unit is controlled by the control unit, so that the interface unit is connected with AC-DC conversion units with different rated powers, and different AC-DC conversion units can convert the input first AC signal into DC signals with different output voltages based on the corresponding rated power, thereby providing different output voltages to the interface unit, and only one energy conversion is performed, thereby improving the charging efficiency.

[0029] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0030] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0031] Figure 1 a functional block diagram of the embodiments of the charging circuit provided by the present application;

[0032] Figure 2 a circuit diagram of the first charging protocol chip in the embodiments of the charging circuit provided by the present application;

[0033] Figure 3 a circuit diagram of the second charging protocol chip in the embodiments of the charging circuit provided by the present application.

[0034] REFERENCE NUMERALS:

[0035] Interface unit 100, interface sub-unit 110, AC-DC conversion unit 200, switch unit 300, first switch sub-unit 310, second switch sub-unit 320, control unit 400. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it needs to be understood that the orientation description, such as the orientation or position relationship indicated by up, down and the like, is based on the orientation or position relationship shown in the drawings, which is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, plural means more than two. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0040] The following refers to Figures 1 to 3 A charging circuit and a charger according to an embodiment of the present application are described.

[0041] An embodiment of the present application provides a charging circuit, as shown in Figure 1 The charging circuit comprises:

[0042] an interface unit 100;

[0043] a plurality of AC-DC conversion units 200, each of which is connected with the interface unit 100, each of which is used to convert the input first AC signal into a DC signal and output the DC signal to the interface unit 100, and the rated power of each of the plurality of AC-DC conversion units 200 is different;

[0044] a switch unit 300, which is arranged between the plurality of AC-DC conversion units 200 and the interface unit 100;

[0045] a control unit 400, each of the plurality of AC-DC conversion units 200 is connected with the control unit 400, the control unit 400 is connected with the switch unit 300, and the control unit 400 is used to control the conduction state of the switch unit 300.

[0046] In the embodiment, the conduction state of the switch unit 300 is controlled by the control unit 400, so that the interface unit 100 can be connected with the AC-DC conversion units 200 with different rated powers. Different AC-DC conversion units 200 can convert the input first AC signal into a DC signal with different output voltages based on the corresponding rated power, thereby providing different output voltages to the interface unit 100, and only one energy conversion is performed, thereby improving the charging efficiency.

[0047] In some embodiments of the application, the AC-DC conversion unit 200 is capable of converting the input first AC signal into a DC signal at an operating power less than the rated power. In the case of outputting a DC signal with the same current size, the DC signal output by the AC-DC conversion unit 200 with a smaller operating power has a smaller voltage. The rated powers of the plurality of AC-DC conversion units 200 are different. The greater the rated power of the AC-DC conversion unit 200 that is turned on, the faster the corresponding charging speed.

[0048] In some embodiments of the application, the interface unit 100 is connected to the control unit 400, and the interface unit 100 is connected to the charging device. The control unit 400 is configured to obtain a charging protocol of the charging device. The control unit 400 is configured to control the on-off state of the switch unit 300 according to the charging protocol, so that the interface unit 100 is turned on with the target AC-DC conversion unit 200, so that the target AC-DC conversion unit 200 outputs a DC signal to the interface unit 100. The target AC-DC conversion unit 200 is the AC-DC conversion unit 200 corresponding to the rated power requested by the charging protocol.

[0049] In some embodiments of the application, the switch unit 300 can be a multi-channel analog switch. The interface unit 100 can be connected to a plurality of AC-DC conversion units 200 through the multi-channel analog switch. The control unit 400 can independently control whether the plurality of AC-DC conversion units 200 are turned on with the interface unit 100 through the multi-channel analog switch.

[0050] In some embodiments of the application, as shown in Figure 1 The interface unit 100 includes at least one interface sub-unit 110. Each interface sub-unit 110 is connected to at least one AC-DC conversion unit 200 through the switch unit 300.

[0051] In this embodiment, the interface unit 100 includes at least one interface sub-unit 110 to provide at least one charging interface for the charging device to charge. For example, the interface unit 100 includes four interface sub-units 110. Each interface sub-unit 110 can be connected to one or more AC-DC conversion units 200 through the switch unit 300 to provide an output voltage based on the rated power.

[0052] For example, the interface sub-unit 110 is connected to one AC-DC conversion unit 200 to provide an output voltage of one AC-DC conversion unit 200 based on the rated power. The interface sub-unit 110 is connected to two AC-DC conversion units 200 through the switch unit 300 to provide an output voltage of two AC-DC conversion units 200 based on the rated power.

[0053] In some embodiments of the present application, the type of interface subunit 110 can be selected according to the application scenario, for example, the interface subunit 110 can adopt a USB-A interface or a USB-C interface. As shown in Figure 2 , TYPE C1 and TYPE C2 are both interface subunits 110, and both are USB-C interfaces. As shown in Figure 3 , TYPE C3 and USB-A1 are both interface subunits 110, TYPE C3 is a USB-C interface, and USB-A1 is a USB-A interface.

[0054] In some embodiments of the present application, as shown in Figure 1 , the switch unit 300 includes a plurality of first switch subunits 310 corresponding to the number of interface subunits 110, and the plurality of first switch subunits 310 are arranged corresponding to the plurality of interface subunits 110, and each first switch subunit 310 is connected with at least one AC-DC conversion unit 200.

[0055] In the present embodiment, when the interface subunit 110 is connected with a charging device, the control module can control the conduction state of the first switch subunit 310, so as to make the AC-DC conversion unit 200 connected with the first switch subunit 310 provide a direct current signal to the corresponding interface subunit 110.

[0056] In some embodiments of the present application, as shown in Figure 1 , the number of AC-DC conversion units 200 is two, and the power of the two AC-DC conversion units 200 can be selected according to the application scenario, for example, the power of the two AC-DC conversion units 200 is 100W and 30W respectively.

[0057] In some embodiments of the present application, as shown in Figure 1 , the first switch subunit 310 includes at least one second switch subunit 320, and each second switch subunit 320 is connected with one AC-DC conversion unit 200.

[0058] In the present embodiment, if the interface subunit 110 is connected with N AC-DC conversion units 200, the corresponding first switch subunit 310 includes N second switch subunits 320, and the N AC-DC conversion units 200 provide a direct current signal to the interface subunit 110 through the corresponding second switch subunit 320.

[0059] In some embodiments of the present application, each second switch subunit 320 includes:

[0060] a first MOS tube, the drain of the first MOS tube is connected with the AC-DC conversion unit 200, and the gate of the first MOS tube is connected with the control unit 400;

[0061] A second MOS transistor, a source of the second MOS transistor is connected to a source of the first MOS transistor, a drain of the second MOS transistor is connected to the interface subunit 110, and a gate of the first MOS transistor is connected to the control unit 400.

[0062] In the embodiment, the control unit 400 can control the first MOS transistor and the second MOS transistor to be turned on or turned off by outputting the control signal to the first MOS transistor and the second MOS transistor, so as to turn on or turn off the AC-DC conversion unit 200 and the interface subunit 110. The first MOS transistor and the second MOS transistor are connected back to back, and if the interface subunit 110 is connected to two or more AC-DC conversion units 200, the output voltage of the two AC-DC conversion units 200 connected to the interface subunit 110 can be prevented from flowing back to each other through the body diode, and the safety of the circuit is improved.

[0063] As shown in FIG. 4, Q5 and Q4 are the first MOS transistor and the second MOS transistor respectively, and Q7 and Q6 are the first MOS transistor and the second MOS transistor respectively. Figure 2 As shown in FIG. 4, Q5 and Q4 are the first MOS transistor and the second MOS transistor respectively, and Q7 and Q6 are the first MOS transistor and the second MOS transistor respectively. Figure 3 As shown in FIG. 4, Q5 and Q4 are the first MOS transistor and the second MOS transistor respectively, and Q7 and Q6 are the first MOS transistor and the second MOS transistor respectively.

[0064] In some embodiments of the present application, each second switch subunit 320 comprises:

[0065] A third MOS transistor, a drain of the third MOS transistor is connected to the AC-DC conversion unit 200, a source of the third MOS transistor is connected to the interface subunit 110, and a gate of the third MOS transistor is connected to the control unit 400.

[0066] In the embodiment, when the interface subunit 110 is connected to only one AC-DC conversion unit 200, the control unit 400 can control the third MOS transistor to be turned on or turned off by outputting the control signal to the third MOS transistor, so as to turn on or turn off the AC-DC conversion unit 200 and the interface subunit 110.

[0067] As shown in FIG. 4, Q1 is the third MOS transistor. Figure 2 As shown in FIG. 4, Q5 and Q4 are the first MOS transistor and the second MOS transistor respectively, and Q7 and Q6 are the first MOS transistor and the second MOS transistor respectively. Figure 3 As shown in FIG. 4, Q5 and Q4 are the first MOS transistor and the second MOS transistor respectively, and Q7 and Q6 are the first MOS transistor and the second MOS transistor respectively.

[0068] In some embodiments of the present application, each AC-DC conversion unit 200 comprises:

[0069] A transformer subunit, the transformer subunit is connected to the switch unit 300, and the transformer subunit is used to reduce the voltage of the first AC signal to obtain a second AC signal.

[0070] A rectifier subunit, the rectifier subunit is connected to the transformer subunit, and the rectifier subunit is used to convert the second AC signal into a DC signal.

[0071] The output regulation subunit is connected to the transformer subunit, and the control unit 400 is connected to the output regulation subunit. The output regulation subunit is used to regulate the DC signal.

[0072] In this embodiment, the transformer subunit converts the input first AC signal into a second AC signal with a lower voltage, and then the rectifier subunit converts the second AC signal into a DC signal. The output regulation subunit regulates the DC signal so that the DC signal meets the output requirements.

[0073] In some embodiments of this application, the rated power of the transformer subunit of each AC-DC conversion unit 200 is different. The transformer subunit may be a transformer. The rectifier subunit may be a full-wave rectifier circuit, a half-wave rectifier circuit, etc.

[0074] like Figure 2 As shown, T1 is a transformer subunit. Figure 3 As shown, T2 is a transformer subunit.

[0075] In some embodiments of this application, the rectifier subunit includes:

[0076] The drain of the fourth MOSFET is connected to the transformer sub-unit, and the source of the fourth MOSFET is grounded.

[0077] The fifth MOSFET has its drain connected to the drain of the fourth MOSFET, and its source is grounded.

[0078] The synchronous rectifier controller is connected to the transformer sub-unit, the gate of the fourth MOSFET, and the gate of the fifth MOSFET.

[0079] In this embodiment, the synchronous rectifier controller outputs control signals to the gates of the fourth and fifth MOSFETs to control the conduction or cutoff of the fourth and fifth MOSFETs, thereby rectifying the second AC signal to obtain a DC signal.

[0080] like Figure 2 As shown, Q2 and Q3 are the fourth and fifth MOSFETs, respectively.

[0081] In some embodiments of this application, the rectifier subunit includes:

[0082] The drain of the fourth MOSFET is connected to the transformer sub-unit, and the source of the fourth MOSFET is grounded.

[0083] The synchronous rectifier controller is connected to the gate of the transformer sub-unit and the fourth MOSFET, respectively.

[0084] In the embodiment, the synchronous rectification controller controls the fourth MOS tube to be turned on or turned off by outputting a control signal to the gate of the fourth MOS tube, thereby rectifying the second alternating current signal to obtain a direct current signal.

[0085] As shown in Figure 3 , wherein Q8 is the fourth MOS tube.

[0086] In some embodiments of the present application, the output adjusting subunit comprises:

[0087] The transmitting end of the optocoupler is connected to the transformer subunit, and the receiving end of the optocoupler is connected to the control unit 400.

[0088] The power management chip is connected to the transformer subunit and the receiving end of the optocoupler, respectively.

[0089] In the embodiment, the transmitting end of the optocoupler connected to the transformer subunit emits light, the receiving end of the optocoupler generates a corresponding current and outputs it to the power management chip, the power management chip adjusts the direct current signal output by the transformer subunit according to the current size of the receiving end of the optocoupler, thereby realizing feedback adjustment of the direct current signal. The control unit 400 can control the current size flowing through the transmitting end of the optocoupler by outputting a control signal to the negative electrode of the transmitting end of the optocoupler according to the charging protocol, thereby controlling the output of the direct current signal.

[0090] As shown in Figure 2 , wherein U4B is the transmitting end of the optocoupler, U4A is the receiving end of the optocoupler, and U3 is the power management chip. As shown in Figure 3 , wherein U8B is the transmitting end of the optocoupler, U8A is the receiving end of the optocoupler, and U7 is the power management chip.

[0091] In some embodiments of the present application, the control unit 400 comprises at least one charging protocol chip, and in the case of multiple charging protocol chips, the multiple charging protocol chips are communicatively connected; each alternating current-direct current conversion unit 200 is connected to one charging protocol chip.

[0092] In the case of one charging protocol chip, the multiple alternating current-direct current conversion units 200 are all connected to the charging protocol chip, the charging protocol chip is connected to the switching unit 300, and the charging protocol chip is used to control the conduction state of the switching unit 300.

[0093] In this embodiment, when there are multiple charging protocol chips, these chips can communicate with each other and control different second switch subunits 320 to close or open, thereby controlling different AC-DC conversion units 200 to conduct to the interface subunit 110. In other words, by increasing the number of charging protocol chips, more AC-DC conversion units 200 and interface subunits 110 can be added. When there is only one charging protocol chip, the charging protocol chip controls different second switch subunits 320 to close or open, thereby controlling different AC-DC conversion units 200 to conduct to the interface subunit 110.

[0094] like Figures 2 to 3 As shown, U2 and U5 are charging protocol chips. U2 and U5 are connected to each other and each is connected to an AC-DC conversion unit 200 and two interface subunits 110.

[0095] In addition, embodiments of this application provide a charger, including the charging circuit described above.

[0096] The charger provided in this application embodiment can implement the various processes implemented in the above circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described again here.

[0097] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A charging circuit, characterized by, The application relates to an interface unit, a plurality of AC-DC conversion units, a switch unit and a control unit. The AC-DC conversion units are connected with the interface unit, and each of the AC-DC conversion units is used for converting an input first AC signal into a DC signal and outputting the DC signal to the interface unit; the rated power of the AC-DC conversion units is different. The switch unit is arranged between the AC-DC conversion units and the interface unit. The control unit is connected with the AC-DC conversion units, and the control unit is connected with the switch unit and used for controlling the on-off state of the switch unit. The interface unit comprises at least one interface subunit, each of the interface subunits is connected with at least one AC-DC conversion unit through the switch unit.

2. The charging circuit of claim 1, wherein, The switch unit comprises a plurality of first switch subunits corresponding to the number of the interface subunits, and each of the first switch subunits is connected with at least one AC-DC conversion unit.

3. The charging circuit of claim 2, wherein, Each of the first switch subunits comprises at least one second switch subunit, and each of the second switch subunits is connected with one AC-DC conversion unit.

4. The charging circuit of claim 3, wherein, Each of the second switch subunits comprises a first MOS tube, a source electrode of the first MOS tube is connected with a source electrode of the second MOS tube, a drain electrode of the second MOS tube is connected with the interface subunit, and a gate electrode of the first MOS tube is connected with the control unit.

5. The charging circuit of claim 4, wherein, Each of the AC-DC conversion units comprises a transformer subunit, a rectifier subunit and an output adjustment subunit. The transformer subunit is connected with the switch unit and used for reducing the voltage of the first AC signal to obtain a second AC signal. The rectifier subunit is connected with the transformer subunit and used for converting the second AC signal into the DC signal.

6. The charging circuit of claim 1, wherein, The output adjustment subunit is connected with the transformer subunit and the control unit and used for adjusting the DC signal. The rectifier subunit comprises a fourth MOS tube, a fifth MOS tube and a synchronous rectification controller. The fourth MOS tube is connected with the transformer subunit and has a grounded source electrode. The fifth MOS tube is connected with the drain electrode of the fourth MOS tube and has a grounded source electrode.

7. The charging circuit of claim 6, wherein, The synchronous rectification controller is connected with the transformer subunit, a gate electrode of the fourth MOS tube and a gate electrode of the fifth MOS tube. The output adjustment subunit comprises an optical coupler and a power management chip. The optical coupler is connected with the transformer subunit and the control unit. The power management chip is connected with the transformer subunit and the optical coupler.

8. The charging circuit of claim 6, wherein, ​ ​ ​ 9. The charging circuit of claim 1, wherein, The control unit comprises at least one charging protocol chip, and a plurality of charging protocol chips are in communication connection with each other; each AC-DC conversion unit is connected with one charging protocol chip.

10. A charger characterized by comprising: The charging circuit comprises the charging circuit as claimed in any one of claims 1 to 9.

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