CN107979121B - Charging circuit and power conversion circuit thereof - Google Patents
Charging circuit and power conversion circuit thereof Download PDFInfo
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- CN107979121B CN107979121B CN201710256513.2A CN201710256513A CN107979121B CN 107979121 B CN107979121 B CN 107979121B CN 201710256513 A CN201710256513 A CN 201710256513A CN 107979121 B CN107979121 B CN 107979121B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A charging circuit for providing a charging power to charge a battery includes a power transmitting unit and a power converting circuit. The power conversion circuit comprises an inductor which is coupled with the inductor and comprises at least one conversion switch, a front-stage switch which is used for conducting the direct current power supply to generate an intermediate power supply and a direct charging switch. Wherein in the switched charging mode, the transfer switch converts the intermediate power supply to generate the charging power supply on a charging node; in the direct charging mode, the power transmitting unit regulates the direct current, and the pre-stage switch and the direct charging switch conduct the direct current to generate the charging current on the charging node. The body diode of the pre-stage switch is coupled with the body diode of the transfer switch in a reverse direction, and the body diode of the pre-stage switch is coupled with the body diode of the direct charging switch in the reverse direction to block a parasitic body current. In addition, the invention also provides a power supply conversion circuit for the charging circuit.
Description
Technical Field
The present invention relates to a charging circuit, and more particularly, to a capacitive power conversion circuit integrating a direct charging mode and a switching charging mode. The invention also relates to a power conversion circuit for a charging circuit.
Background
Fig. 1 discloses a charging circuit (charging circuit 1) of the prior art, which includes a switching conversion circuit 60, which can convert the power supply (such as but not limited to VBUS of 5V or 9V or 12V of USB PD) provided by the power adapter 11 into a charging current ICHG to charge the battery 50 in the charging mode.
The prior art shown in fig. 1 has the disadvantages that the power conversion efficiency is low due to the two-stage power conversion (the power adapter 11 and the switching conversion circuit 60), and in addition, in small-sized applications such as smart phones, especially under the requirement of relatively large constant charging current ICHG (for example, greater than 3A), the operating temperature of the switching conversion circuit 60 may be too high, so that only small constant charging current ICHG (for example, less than 3A) can be used for charging, and thus the charging time cannot be effectively shortened.
Fig. 2 shows another charging circuit (charging circuit 2) of the prior art, which is similar to the charging circuit 1, and the charging circuit 2 further includes a load switch 40(load switch), wherein the power adapter 12 with direct charging capability can directly provide a constant dc current IDC to charge the battery 50 via a cable 20 (e.g. USB cable) and the load switch 40 with a Constant Current (CC) in a direct charging mode during a charging phase requiring a large charging current, wherein the dc current IDC is substantially equal to the charging current ICHG. In the direct charging mode, the charging circuit 2 has a high power conversion efficiency due to only a single stage of power conversion (the power adapter 12), and in small-sized applications such as smart phones, the battery can be charged with a relatively large constant charging current (e.g., greater than 3A), so that the charging time can be effectively shortened, and the operating temperature of mobile devices such as smart phones is not too high. In other charging phases, the switching charging circuit 60 converts the power supplied by the power adapter 12 (such as but not limited to VBUS of 5V or 9V or 12V of USB PD) to pre-charge or charge the battery 50 at a constant voltage.
However, the prior art shown in fig. 2 has a disadvantage that the switching charging circuit 60 and the load switch 40 are generally independent integrated circuits (ics), so that the control of the charging circuit 2 is complicated and the cost is high.
Compared with the prior art shown in fig. 1, the invention has the advantages that the direct charging path and the switching power supply switching charging path are provided at the same time, and relatively large current can be used for charging, so that the charging time can be greatly shortened, and the overhigh operating temperature of mobile devices such as smart phones and the like can not be caused. Compared with the prior art shown in fig. 2, the present invention can integrate the switching charging circuit and the load switch into an integrated circuit (or an integrated circuit package), which has the advantages of easy control, reduced size, and reduced cost.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a charging circuit and a power conversion circuit thereof, which can simultaneously have a direct charging path and a switching power conversion charging path, and can charge with relatively large current, so that the charging time can be greatly shortened, and the overhigh operating temperature of mobile devices such as smart phones and the like cannot be caused; in addition, the switching charging circuit and the load switch can be integrated into an integrated circuit (or an integrated circuit package), so as to achieve the advantages of easy control, reduced size, reduced cost, etc.
In one aspect, the present invention provides a charging circuit for converting an input power into a charging power to charge a battery, wherein the charging power comprises a charging voltage and a charging current; the charging circuit includes: a power supply transmitting unit for converting the input power supply into a direct current power supply, wherein the direct current power supply comprises a direct current voltage and a direct current; a power conversion circuit, comprising: a transfer switch circuit coupled to an inductor, including at least one transfer switch; a pre-switch coupled between the DC power source and an intermediate node for turning on the DC power source to generate an intermediate power source at the intermediate node, wherein the intermediate power source comprises an intermediate voltage and an intermediate current; a direct charging switch coupled between the intermediate node and a charging node; and a control circuit for generating a pre-switch control signal, a direct-charge switch control signal and a transfer switch control signal for controlling the pre-switch, the direct-charge switch and the transfer switch, respectively; wherein in a switched charging mode, the control circuit controls the pre-stage switch to be turned on, the direct charging switch to be turned off, and the transfer switch to transfer the intermediate power supply to the charging node to generate the charging power supply; in a direct charging mode, the control circuit controls the front-stage switch and the direct charging switch to be conducted, so that the direct current source generates the charging power supply on the charging node.
In a preferred embodiment, the transfer switch, the pre-switch and the direct-charge switch each have a body diode (body diode), the body diode of the pre-switch is coupled in reverse with the body diode of the transfer switch, and the body diode of the pre-switch is coupled in reverse with the body diode of the direct-charge switch for blocking a parasitic body current (parasitic body current) of the transfer switch or the body diode of the direct-charge switch.
In a preferred embodiment, in the direct charging mode, the power transmitting unit adjusts the dc current to a predetermined dc current level according to a dc related signal, and/or adjusts the dc voltage to a predetermined dc voltage level according to a dc related signal.
In a preferred embodiment, the pre-stage switch is used for sensing the direct current to generate the direct current related signal.
In a preferred embodiment, the charging circuit further comprises a cable and/or a connector coupled between the power transmitting unit and the pre-switch, wherein the cable and/or the connector conforms to the universal serial bus specification or the universal serial bus power specification (USB or USB PD), the cable and/or the connector comprising a power part and a signal part, wherein the power part is configured to be coupled to the dc power source, and the signal part is configured to transmit the dc-related signal and/or the charging-current-related signal and/or the charging-voltage-related signal.
In a preferred embodiment, the pre-switch and/or the direct charging switch are further used for at least one of the following protection operations: (1) direct current over-high voltage protection (2), direct current and/or medium current and/or charging current over-high current protection (3), direct current power supply disconnection (plug-out) protection.
In another aspect, the present invention provides a power conversion circuit for use in a charging circuit for converting an input power into a charging power to charge a battery, wherein the charging power comprises a charging voltage and a charging current; the charging circuit includes: a power supply transmitting unit for converting the input power supply into a direct current power supply, wherein the direct current power supply comprises a direct current voltage and a direct current; the power conversion circuit includes: a transfer switch circuit coupled to an inductor, including at least one transfer switch; a pre-switch coupled between the DC power source and an intermediate node for turning on the DC power source to generate an intermediate power source at the intermediate node, wherein the intermediate power source comprises an intermediate voltage and an intermediate current; a direct charging switch coupled between the intermediate node and a charging node; and a control circuit for generating a pre-switch control signal, a direct-charge switch control signal and a transfer switch control signal for controlling the pre-switch, the direct-charge switch and the transfer switch, respectively; wherein in a switched charging mode, the control circuit controls the pre-stage switch to be turned on, the direct charging switch to be turned off, and the transfer switch to transfer the intermediate power supply to the charging node to generate the charging power supply; in a direct charging mode, the control circuit controls the front-stage switch and the direct charging switch to be conducted, so that the direct current source generates the charging power supply on the charging node.
In another aspect, the present invention provides a power conversion circuit for use in a charging circuit for converting an input power into a charging power to charge a battery, wherein the charging power comprises a charging voltage and a charging current; the charging circuit includes: a power supply transmitting unit for converting the input power supply into a direct current power supply, wherein the direct current power supply comprises a direct current voltage and a direct current; and a direct charging switch coupled between an intermediate node and a charging node; the power conversion circuit includes: a transfer switch circuit coupled to an inductor, including at least one transfer switch; a pre-switch coupled between the DC power source and the intermediate node for turning on the DC power source to generate an intermediate power source at the intermediate node, wherein the intermediate power source comprises an intermediate voltage and an intermediate current; and a control circuit for generating a pre-switch control signal, a direct-charge switch control signal and a transfer switch control signal for controlling the pre-switch, the direct-charge switch and the transfer switch, respectively; wherein in a switched charging mode, the control circuit controls the pre-stage switch to be turned on, the direct charging switch to be turned off, and the transfer switch to transfer the intermediate power supply to the charging node to generate the charging power supply; in a direct charging mode, the control circuit controls the front-stage switch and the direct charging switch to be conducted, so that the direct current source generates the charging power supply on the charging node.
In a preferred embodiment, the power conversion circuit is also integrated into an integrated circuit or enclosed in an integrated circuit package.
The purpose, technical content, features and effects of the present invention will be more readily understood through the following detailed description of specific embodiments.
Drawings
FIG. 1 shows a schematic diagram of a prior art charging circuit;
FIG. 2 shows a schematic diagram of a prior art charging circuit;
FIG. 3 is a schematic diagram of a charging circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a charging circuit according to an embodiment of the present invention;
fig. 5 shows a schematic diagram of a simulated waveform corresponding to fig. 3 or fig. 4.
Detailed Description
Referring to fig. 3, a schematic diagram of a charging circuit (charging circuit 3) according to an embodiment of the present invention is shown, in which the charging circuit 3 is used to convert an input power (not shown) into a charging power to charge a battery 50, wherein the charging power includes a charging voltage VCHG and a charging current ICHG; the charging circuit 3 includes: a power transmitting unit 10 and a power converting circuit 30.
The power transmitting unit 10 is used for converting the input power into a dc power, wherein the dc power includes a dc voltage VDC and a dc current IDC; the power transmitting unit 10 may be, for example, a power adapter, which converts an input power in an ac form into the aforementioned dc power, or may be a dc-dc converting circuit, which converts an input power from, for example, a mobile power supply (power bank) into the aforementioned dc power;
the power conversion circuit 30 includes a conversion switch circuit 31, a pre-stage switch SP, a direct charging switch SD, and a control circuit 32; the switch circuit 31 is coupled to an inductor L, and includes at least one switch (such as, but not limited to, switches S1 and S2) having a body diode (such as, but not limited to, body diodes DB1 and DB2 of switches S1 and S2); the pre-switch SP is coupled between the dc power source and the intermediate node MID, and is used to conduct the dc power source to generate an intermediate power source on the intermediate node MID, wherein the intermediate power source includes an intermediate voltage VMID and an intermediate current IMID, and the pre-switch SP has a body diode (e.g., body diode DBP in the figure); the direct charging switch SD is coupled between an intermediate node MID and a charging node CHG, and has a body diode (e.g., body diode DBD in the figure); the body diode (body diode) refers to a parasitic diode formed between a body (bulk) and a source (source) or a drain (drain) in a metal oxide semiconductor (mos) transistor, for example.
The control circuit 32 is used for generating a pre-switch control signal VCP, a direct-charge switch control signal VCD and a transfer switch control signal VCS for controlling the pre-switch SP, the direct-charge switch SD and the transfer switch (S1 and S2), respectively.
In a switching charging mode of the charging circuit 3, the control circuit 32 controls the pre-switch SP to be turned on, the direct charging switch SD to be turned off, and switches the switches S1 and S2 according to a charging voltage-related signal and/or a charging current-related signal to convert the charging voltage from the charging node CHG to generate the charging power, so that the charging voltage VCHG is adjusted to a default charging voltage level and/or the charging current ICHG is adjusted to a preset charging current level.
In addition, in a direct charging mode, the power transmitting unit 10 adjusts the dc current IDC to a predetermined dc current level according to a dc related signal, and/or adjusts the dc voltage VDC to a predetermined dc voltage level according to a dc related signal, and the control circuit 32 controls the pre-switch SP and the direct charging switch SD to turn on the dc power to generate the charging power at the charging node CHG.
It should be noted that the converter circuit 31 is not limited to the switching buck converter circuit shown in the figure, and may be other types of converter circuits, such as but not limited to boost converter circuits or buck-boost converter circuits.
Referring to fig. 3, in the present embodiment, the charging circuit 3 of the invention can integrate the power conversion circuit 30 into an integrated circuit or be enclosed in an integrated circuit package, so as to achieve direct charging and switching power conversion charging simultaneously, which is easy to control, and has the advantages of reduced size and cost.
It is noted that, in an embodiment, the direct charging switch SD may not be integrated into the integrated circuit or the integrated circuit package. Referring to fig. 4, a schematic diagram of another embodiment of the charging circuit (charging circuit 4) of the present invention is shown, in this embodiment, the power conversion circuit 30 'is not integrated with the direct charging switch SD, and in case of implementing the power conversion circuit by an integrated circuit, the power conversion circuit 30' may include pins P1 and P2 for respectively coupling the current inflow terminal of the direct charging switch SD and the intermediate node MID, and coupling the control terminal of the direct charging switch SD and the direct charging switch control signal VCD, so as to achieve the above-mentioned various charging modes.
Under the conditions of, for example, a relatively low dc voltage VDC and a relatively high charging voltage VCHG (i.e., a relatively high battery voltage), even when the switches are not turned on, a parasitic body current (or reverse current, which is opposite to the charging current direction) flowing through the body diodes including the switches may be caused; with continued reference to fig. 3 and 4, to prevent the parasitic body current, in one embodiment, the body diode DBP of the pre-switch SP is coupled in reverse with the body diode (DB1 or DB2) of the transfer switch (S1 or S2), and the body diode DBP of the pre-switch SP is coupled in reverse with the body diode DBD of the direct-charging switch SD to block the parasitic body current of the transfer switch or the body diodes (DB1, DB2 and DBD) of the direct-charging switch. It should be noted that the aforementioned way of blocking the parasitic body current is not limited to the reverse coupling of the body diode between the switches, and in one embodiment, the transfer switch circuit may include a power element such as a power diode, which may also be coupled in reverse phase with the body diode of the front-stage switch SP to block the parasitic body current; in short, it is consistent with the spirit of the present invention to have more than one pair of body diodes or body diodes and power diodes coupled in opposite phases in the charging current path of the switching charging mode to block the parasitic body current.
Referring to fig. 3 and 4, in an embodiment, the pre-switch SP may be used for sensing the dc current IDC to generate the dc current related signal as the basis for the dc current regulation; in one embodiment, the charging voltage or the charging current can be adjusted according to the switching of the transfer switch.
With continued reference to fig. 3 and 4, in an embodiment, the charging circuit 3 or 4 may further include a cable 20 and/or a connector 70 coupled between the power transmitting unit 10 and the front switch SP, wherein the cable 20 and the connector 70 conform to the USB specification or the USB specification (USB or USB PD), and the cable 20 and/or the connector 70 include a power portion and a signal portion, wherein the power portion is coupled to the dc power source, and the signal portion is configured to transmit the dc-related signal, the charging-current-related signal, and the charging-voltage-related signal; it should be noted that the power portion refers to the power line 21 included in the cable 20 or the power contact 71 included in the connector 70, and the signal portion refers to the signal line 22 included in the cable 20 or the signal contact 72 included in the connector 70, as shown in the figure.
Fig. 5 shows analog waveform diagrams corresponding to fig. 3 and 4, and referring to fig. 3, 4 and 5, fig. 5 shows a complete charging phase of a battery (e.g. the battery 50 of the previous embodiment), wherein during the pre-charging phase between t2 and t3, the charging circuit 3 or 4 of the present invention can perform a relatively low current constant current charging (e.g. trickle charging) on the battery 50 in the aforementioned switched charging mode, as shown, wherein the dc voltage VDC (e.g. solid line in the upper half of the figure) is adjusted to 5V, and the transfer switch circuit 31 in fig. 3 and 4 converts the dc voltage VDC to generate the charging current ICHG (e.g. dashed line in the lower half of the figure) and adjusts it to, for example, about 1A to perform constant current pre-charging on the battery 50, while the pre-stage switch SP is turned on and the direct charging switch SD is turned off.
Referring to fig. 5, during the constant current charging period between t3 and t7, the power routing unit 10 can adjust the dc current IDC (as shown by the solid line in the lower half of the figure) to be a constant current to charge the battery 50 in the direct charging mode, as shown in the figure, in a preferred embodiment, the power routing unit 10 can adjust the dc current IDC to be a constant current for several stages (e.g., corresponding to 5A, 4A, 3A and 2A in the figure) during several sub-periods (t3-t4-t5-t6-t7), at which the front switch SP and the direct charging switch SD are both turned on, and the transfer switch circuit 31 does not perform power conversion, and the charging current ICHG is approximately equal to the dc current.
Referring to fig. 5, in the constant voltage charging phase after t7, the charging circuit 5 charges the battery 50 with the aforementioned constant voltage, as shown in the figure, the power transmitting unit 10 in this embodiment adjusts the dc voltage VDC to 5V, and the switch circuit 31 in fig. 3 and 4 converts the dc voltage VDC to generate the charging voltage VCHG (as the dashed line in the upper half of the figure), and adjusts it to 4.2V, for example, to charge the battery 50 with the constant voltage, wherein the current ICHG is naturally decreased. The end of charge (not shown) is similar to the precharge and will not be described herein.
In addition, in an embodiment, the pre-switch SP and/or the direct charging switch SD may be further used for at least one of the following protection operations: (1) the dc over-voltage protection is configured to, according to the dc voltage-related signal, control the pre-switch SP and/or the direct charge switch SD to be non-conductive when the dc voltage VDC is higher than an over-voltage threshold, for example, to protect the battery 50 and the post-circuit. (2) The dc current and/or the intermediate current and/or the charging current may be used for an excessive current protection, which is based on the dc current related signal and/or the intermediate current related signal and/or the charging current related signal, and when the respective currents are higher than respective excessive current thresholds, the pre-switches SP and/or the direct charging switch SD may be controlled to be non-conductive, or may be linearly controlled to limit the currents, so as to protect the battery 50 and the post-circuit. (3) The plug-out protection of the dc power is used to, for example, detect that the power transmitting unit 10 is not connected (i.e., disconnected) or not transmitting power according to the dc voltage related signal and/or the dc current related signal, and for example, control the front switch SP and/or the direct charging switch SD to be non-conductive to protect the battery 50 and the rear circuit.
The present invention has been described in terms of the preferred embodiments, and the above description is only for the purpose of making the content of the present invention easy to understand for those skilled in the art, and is not intended to limit the scope of the present invention. The embodiments described are not limited to single use, but may be used in combination. In addition, equivalent variations and combinations are contemplated by those skilled in the art within the spirit of the present invention, for example, a system switch may be included between the transfer switch circuit and the battery to further separate the system voltage (for supplying the post-stage circuit) from the charging power source; the system switch may also be linearly adjustable, for example. For another example, the arrangement of the current direction of the body diode in the foregoing embodiments is merely exemplary and not limiting, as long as the foregoing reverse coupling relationship is satisfied, i.e., the spirit of the present invention is satisfied. For another example, the power conversion circuit may also be a linear power conversion circuit, and the charging path and the direct charging path share a front-stage switch, which is in accordance with the spirit of the present invention. For example, the term "performing processing or operation or generating an output result according to a signal" in the present invention is not limited to the signal itself, and includes performing voltage-to-current conversion, current-to-voltage conversion, and/or ratio conversion on the signal, and then performing processing or operation according to the converted signal to generate an output result, if necessary. It is understood that those skilled in the art can devise various equivalent variations and combinations, not necessarily all illustrated, without departing from the spirit of the invention. Accordingly, the scope of the present invention should be determined to encompass all such equivalent variations as described above.
Claims (14)
1. A charging circuit is used for converting an input power supply into a charging power supply to charge a battery, wherein the charging power supply comprises a charging voltage and a charging current; wherein, this charging circuit contains:
a power supply transmitting unit for converting the input power supply into a direct current power supply, wherein the direct current power supply comprises a direct current voltage and a direct current;
a power conversion circuit, comprising:
a transfer switch circuit coupled to an inductor, including at least one transfer switch;
a pre-switch coupled between the DC power source and an intermediate node for turning on the DC power source to generate an intermediate power source at the intermediate node, wherein the intermediate power source comprises an intermediate voltage and an intermediate current;
a direct charging switch coupled between the intermediate node and a charging node; and
a control circuit for generating a pre-switch control signal, a direct-charge switch control signal and a transfer switch control signal for controlling the pre-switch, the direct-charge switch and the transfer switch, respectively;
wherein in a switched charging mode, the control circuit controls the pre-stage switch to be turned on, the direct charging switch to be turned off, and the transfer switch to transfer the intermediate power supply to the charging node to generate the charging power supply;
in a direct charging mode, the control circuit controls the front-stage switch and the direct charging switch to be conducted, so that the direct current source generates the charging power supply on the charging node.
2. The charging circuit of claim 1, wherein the transfer switch, the pre-switch, and the direct-charging switch each have a body diode, wherein the body diode of the pre-switch is coupled in reverse with the body diode of the transfer switch, and the body diode of the pre-switch is coupled in reverse with the body diode of the direct-charging switch, for blocking a parasitic body current of the transfer switch or the body diode of the direct-charging switch.
3. The charging circuit according to claim 1, wherein in the direct charging mode, the power transmitting unit adjusts the dc current to a predetermined dc current level according to a dc related signal, and/or adjusts the dc voltage to a predetermined dc voltage level according to a dc related signal.
4. The charging circuit of claim 3, wherein the pre-stage switch is configured to sense the DC current to generate the DC-related signal.
5. The charging circuit of claim 3, further comprising a cable and/or a connector coupled between the power transmitting unit and the pre-switch, wherein the cable and/or the connector conforms to the USB specification or the USB power specification and/or the connector, the cable and/or the connector comprising a power part and a signal part, wherein the power part is coupled to the DC power part and the signal part is used to transmit the DC-related signal and/or a charging current-related signal related to the charging current and/or a charging voltage-related signal related to the charging voltage.
6. The charging circuit of claim 1, wherein the pre-switch and/or the direct charging switch are further configured to protect at least one of: (1) direct current over-voltage protection (2), direct current and/or medium current and/or charging current over-current protection (3), and direct current power supply disconnection protection.
7. The charging circuit of claim 1, wherein the power conversion circuit is integrated into an integrated circuit or enclosed in an integrated circuit package.
8. A power conversion circuit is used in a charging circuit, the charging circuit is used for converting an input power into a charging power to charge a battery, wherein the charging power comprises a charging voltage and a charging current; the charging circuit includes: a power supply transmitting unit for converting the input power supply into a direct current power supply, wherein the direct current power supply comprises a direct current voltage and a direct current; the power conversion circuit is characterized by comprising:
a transfer switch circuit coupled to an inductor, including at least one transfer switch;
a pre-switch coupled between the DC power source and an intermediate node for turning on the DC power source to generate an intermediate power source at the intermediate node, wherein the intermediate power source comprises an intermediate voltage and an intermediate current;
a direct charging switch coupled between the intermediate node and a charging node; and
a control circuit for generating a pre-switch control signal, a direct-charge switch control signal and a transfer switch control signal for controlling the pre-switch, the direct-charge switch and the transfer switch, respectively;
wherein in a switched charging mode, the control circuit controls the pre-stage switch to be turned on, the direct charging switch to be turned off, and the transfer switch to transfer the intermediate power supply to the charging node to generate the charging power supply;
in a direct charging mode, the control circuit controls the front-stage switch and the direct charging switch to be conducted, so that the direct current source generates the charging power supply on the charging node.
9. A power conversion circuit is used in a charging circuit, the charging circuit is used for converting an input power into a charging power to charge a battery, wherein the charging power comprises a charging voltage and a charging current; the charging circuit includes: a power supply transmitting unit for converting the input power supply into a direct current power supply, wherein the direct current power supply comprises a direct current voltage and a direct current; and a direct charging switch coupled between an intermediate node and a charging node; the power conversion circuit is characterized by comprising:
a transfer switch circuit coupled to an inductor, including at least one transfer switch;
a pre-switch coupled between the DC power source and the intermediate node for turning on the DC power source to generate an intermediate power source at the intermediate node, wherein the intermediate power source comprises an intermediate voltage and an intermediate current;
and
a control circuit for generating a pre-switch control signal, a direct-charge switch control signal and a transfer switch control signal for controlling the pre-switch, the direct-charge switch and the transfer switch, respectively;
wherein in a switched charging mode, the control circuit controls the pre-stage switch to be turned on, the direct charging switch to be turned off, and the transfer switch to transfer the intermediate power supply to the charging node to generate the charging power supply;
in a direct charging mode, the control circuit controls the front-stage switch and the direct charging switch to be conducted, so that the direct current source generates the charging power supply on the charging node.
10. The power conversion circuit of any one of claims 8 or 9, wherein the transfer switch, the pre-switch, and the direct-charge switch each have a body diode, wherein the body diode of the pre-switch is coupled in reverse with the body diode of the transfer switch, and the body diode of the pre-switch is coupled in reverse with the body diode of the direct-charge switch for blocking a parasitic body current of the transfer switch or the body diode of the direct-charge switch.
11. The power conversion circuit according to any one of claims 8 or 9, wherein in the direct charging mode, the power transmitting unit adjusts the dc current to a predetermined dc current level according to a dc related signal, and/or adjusts the dc voltage to a predetermined dc voltage level according to a dc related signal.
12. The power conversion circuit of claim 11, wherein the pre-switch is configured to sense the dc current to generate the dc current related signal.
13. The power conversion circuit according to any one of claims 8 or 9, wherein the pre-switch and/or the direct charging switch are further configured to perform at least one of the following protection operations: (1) direct current over-voltage protection (2), direct current and/or medium current and/or charging current over-current protection (3), and direct current power supply disconnection protection.
14. A power conversion circuit according to any of claims 8 or 9, further integrated into an integrated circuit or enclosed in an integrated circuit package.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/628,109 US10177420B2 (en) | 2016-10-21 | 2017-06-20 | Charger circuit and power conversion circuit thereof |
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| US201662411171P | 2016-10-21 | 2016-10-21 | |
| US62/411,171 | 2016-10-21 |
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| CN107979121B true CN107979121B (en) | 2020-02-07 |
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| CN110854802B (en) * | 2018-08-20 | 2022-06-28 | 纬联电子科技(中山)有限公司 | Overcurrent protection circuit and method thereof |
| CN111835045A (en) * | 2019-04-17 | 2020-10-27 | 安克创新科技股份有限公司 | Charging device and load device |
| CN111835044B (en) * | 2019-04-17 | 2024-06-21 | 安克创新科技股份有限公司 | Charging device, load device, and charging system |
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| US4302714A (en) * | 1979-04-27 | 1981-11-24 | Yefsky Sheldon A | Rechargeable battery charger system for charging testing, rejuvenation and preventative maintenance |
| US4453119A (en) * | 1980-01-21 | 1984-06-05 | Terry Staler | Electrical charging control apparatus and method, and solar to electrical energy conversion apparatus incorporating such charging control apparatus |
| CN101546919B (en) * | 2009-01-21 | 2011-08-24 | 炬力集成电路设计有限公司 | Method and device for charging battery |
| CN102684243A (en) * | 2011-03-18 | 2012-09-19 | 祥业科技股份有限公司 | Integrated battery charger |
| CN203261080U (en) * | 2013-05-15 | 2013-10-30 | 立锜科技股份有限公司 | Bi-directional switching type power supply device and control circuit thereof |
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| US4302714A (en) * | 1979-04-27 | 1981-11-24 | Yefsky Sheldon A | Rechargeable battery charger system for charging testing, rejuvenation and preventative maintenance |
| US4453119A (en) * | 1980-01-21 | 1984-06-05 | Terry Staler | Electrical charging control apparatus and method, and solar to electrical energy conversion apparatus incorporating such charging control apparatus |
| CN101546919B (en) * | 2009-01-21 | 2011-08-24 | 炬力集成电路设计有限公司 | Method and device for charging battery |
| CN102684243A (en) * | 2011-03-18 | 2012-09-19 | 祥业科技股份有限公司 | Integrated battery charger |
| CN203261080U (en) * | 2013-05-15 | 2013-10-30 | 立锜科技股份有限公司 | Bi-directional switching type power supply device and control circuit thereof |
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| CN107979121A (en) | 2018-05-01 |
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