CN216531085U - Switch power supply system and power transmission protocol chip thereof - Google Patents
Switch power supply system and power transmission protocol chip thereof Download PDFInfo
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- CN216531085U CN216531085U CN202121255267.7U CN202121255267U CN216531085U CN 216531085 U CN216531085 U CN 216531085U CN 202121255267 U CN202121255267 U CN 202121255267U CN 216531085 U CN216531085 U CN 216531085U
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Abstract
The utility model provides a switching power supply system and a power transmission protocol chip thereof. A power transfer protocol chip for a switching power supply system includes: the current detection pin is used for connecting an output current detection resistor in the switching power supply system; an output voltage bus pin for receiving an output voltage of the switching power supply system from an output voltage bus of the switching power supply system; an output voltage derivation pin for supplying an output voltage of the switching power supply system to the charged device; and an output switch, wherein a drain of the output switch is connected to the output voltage bus pin, a source of the output switch is connected to the output voltage derivation pin, and when the output switch is in a conduction state, an output voltage of the switching power supply system is supplied to the charged device via the output voltage bus pin, the output switch, and the output voltage derivation pin.
Description
Technical Field
The present invention relates to the field of circuits, and more particularly, to a switching power supply system and a power transmission protocol chip thereof.
Background
With the functions of mobile devices such as mobile phones and tablet computers becoming more and more, different manufacturers have built-in large-capacity batteries to increase cruising ability, but the increase in battery capacity leads to the increase in charging time of mobile devices such as mobile phones and the reduction in user experience, so that new research on charging modes is urgently needed.
Mobile devices such as mobile phones and tablet computers are charged through a Universal Serial Bus (USB), but the USB has a physical upper limit of a maximum current, and different manufacturers can only switch an output voltage from a traditional 5V power supply to 9V, 12V, or even 20V or other specific voltage power supplies to improve charging power, so as to realize rapid charging of batteries of the mobile devices. Although mobile devices are all charged quickly, the principle is different, and each portable power adapter is not universal.
In order to standardize the charging standard, the USB standardization organization (USB-IF) has issued an important update of USB PD3.0(Power Delivery 3.0), and has formally introduced pps (programmable Power supply) aiming at unifying the rapid charging specifications, so as to increase the Power output capability of the portable adapter from the default 10W to 100W (20V/5A), to allow accurate regulation of bus voltage and current, and to allow charging of devices such as a notebook computer having a large battery.
When the portable power adapter charges the charged device by adopting a PD protocol, because the output voltage of the portable power adapter is not the traditional 5V output, in order to ensure the safety and reliability of the charged device, a MOSFET switch for turning on/off a VBUS is added to an output Voltage Bus (VBUS) of the portable power adapter, and a current detection resistor is added to a VBUS line, which mainly functions to perform constant current or overcurrent control on the output current, and only when both the portable power adapter and the charged device meet the requirements of the PD protocol, the output MOSFET is turned on, and the portable power adapter can charge the charged device.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned problems, the present invention provides a novel step-down dimming driving circuit.
According to an aspect of an embodiment of the present invention, there is provided a power transmission protocol chip for a switching power supply system, including: the current detection pin is used for connecting an output current detection resistor in the switching power supply system; an output voltage bus pin for receiving an output voltage of the switching power supply system from an output voltage bus of the switching power supply system; an output voltage derivation pin for supplying an output voltage of the switching power supply system to the charged device; and an output switch, wherein a drain of the output switch is connected to the output voltage bus pin, a source of the output switch is connected to the output voltage derivation pin, and when the output switch is in a conduction state, an output voltage of the switching power supply system is supplied to the charged device via the output voltage bus pin, the output switch, and the output voltage derivation pin.
According to another aspect of the embodiments of the present invention, there is provided a switching power supply system including the power transmission protocol chip as described above.
According to the power transmission protocol chip for the switching power supply system, the output voltage bus originally connected to the switching power supply system and the output switch used for controlling whether to provide the output voltage for the charged device are integrated, and the current detection resistor is also integrated, so that the miniaturization, low cost and high efficiency of the switching power supply system (such as a PD quick charging power supply) can be realized.
Drawings
The utility model may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a circuit diagram of a flyback switching power supply employing a conventional PD protocol chip;
FIG. 2 shows a block diagram of a PD protocol chip according to an embodiment of the utility model; and
fig. 3 shows a circuit diagram of a flyback switching power supply employing a PD protocol chip according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below with reference to the accompanying drawings. Example implementations can be embodied in many forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. In the drawings, the size of regions and components may be exaggerated for clarity. Further, in the drawings, the same reference numerals denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration set forth below, but rather covers any modification, substitution, and improvement of elements and components without departing from the spirit of the utility model. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention. Note that, the term "a and B are connected" as used herein may mean "a and B are directly connected" or "a and B are indirectly connected via one or more other elements".
Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 shows a circuit diagram of a flyback switching power supply 100 employing a conventional PD protocol chip 102. As can be seen from fig. 1, the system cost of the flyback switching power supply 100 is high and miniaturization is difficult to achieve due to the multiple pins and the redundancy of peripheral devices of the PD protocol chip 102.
In view of the above problems, the present invention provides a highly integrated PD protocol chip, so that a switching power supply system using the PD protocol chip can be miniaturized and highly integrated, thereby reducing the cost of the switching power supply system using the PD protocol chip.
Fig. 2 shows a block diagram of a PD protocol chip 202 according to an embodiment of the utility model. As shown in fig. 2, the PD protocol chip 202 may include one or more of the following pins:
a current detection pin for connecting an output current detection resistor in the switching power supply system (i.e., a resistor for detecting an output current of the switching power supply system). For example, the PD protocol chip 202 may include two current detection pins, namely a current detection positive pin (i.e., the pin ISP) and a current detection negative pin (i.e., the pin ISN), for connecting to the positive pin and the negative pin of the output current detection resistor, respectively, to implement the output constant current control and the over-current protection detection of the switching power supply system.
An output voltage bus pin (i.e., pin Vbus) for receiving an output voltage of the switching power supply system from an output voltage bus of the switching power supply system;
an output voltage derivation pin (i.e., pin Vbus _ c) for supplying the output voltage of the switching power supply system to the charged device; and
the PD protocol chip 202 may also include an output switch and a SenseFET (detection switch), which includes two functions, one being an output switch function, implemented by an output voltage bus pin (i.e., pin Vbus), an output voltage derivation pin (i.e., pin Vbus _ c), and an output switch. The drain of the output switch is connected to pin Vbus, and the source of the output switch is connected to pin Vbus _ c. When the output switch is in the on state, the output voltage of the switching power supply system is supplied to the charged device via the pin Vbus, the output switch, and the pin Vbus _ c. The other function is a SenseFET function, which is used to detect the current flowing through the SenseFET, and the detected ISP and ISN signals are amplified and controlled by a current detection module (for example, including an output current detection resistor) of the PD protocol chip 202, so as to implement the constant current control and overcurrent detection functions of the output current. Here, it should be noted that the output switch may be changed from the off state to the on state only when both the switching power supply system and the charged device satisfy the requirements of the PD protocol, and the output voltage of the switching power supply system may be supplied to the charged device.
The PD protocol chip 202 according to the embodiment of the present invention integrates the positive pin and the negative pin originally connected to the output current detection resistor of the switching power supply system 100, the current detection resistor, the output switch for controlling whether to provide the output voltage to the charged device, and the driving pin, so that the switching power supply system (e.g., the PD fast charging power supply) can be miniaturized, low-cost, and highly efficient.
As shown in fig. 2, in some embodiments, the PD protocol chip 202 may also include one or more of the following pins:
a data communication pin for connecting a data communication pin of a universal serial bus interface, wherein the pin Vbus _ c supplies the output voltage of the switching power supply system to the charged device via the universal serial bus interface. For example, when the USB is a USB PD TYPE C (TYPE-C) interface, the PD protocol chip 202 may include two data communication pins, a USB PD TYPE-C Data Positive (DP) pin (i.e., pin DP) for connecting a DP signal of the USB PD TYPE-C interface and a USB PD TYPE-C Data Negative (DN) pin (i.e., pin DN) for connecting a DN signal of the USB PD TYPE-C interface.
A channel configuration pin for connecting a channel configuration pin of a universal serial bus interface, wherein pin Vbus _ c provides the output voltage of the switching power supply system to the device to be charged via the universal serial bus interface. For example, when the USB is a USB PD TYPE-C interface, the PD protocol chip 202 may include two channel configuration pins, a USB PD TYPE-C CC1 pin (i.e., pin CC1) and a USB PD TYPE-C CC2 pin (i.e., pin CC2), where the pin CC1 is used to connect a CC1 signal of the USB PD TYPE-C interface, and the pin CC2 is used to receive a CC2 signal of the USB PD TYPE-C interface.
An optocoupler drive pin (i.e., pin OPTO) for connecting an output of an optocoupler in the switching power supply system to implement system level loop control of the switching power supply system.
The voltage loop compensation pin (i.e., pin VFB) for connecting to a reference ground on the secondary side of a transformer in a switching power supply system. For example, the pin VFB may be connected to a reference ground on the secondary side of a transformer in the switching power supply system via a first compensation capacitor and a first compensation resistor to implement loop compensation of the output constant voltage of the switching power supply system.
A current loop compensation pin (i.e., pin IFB) for connecting to a reference ground on the secondary side of a transformer in a switching power supply system. For example, the pin IFB may be connected to a reference ground on the secondary side of a transformer in the switching power supply system via a second compensation capacitor and a second compensation resistor to implement loop compensation of the output constant current of the switching power supply system.
An over-temperature protection pin (i.e., pin RT) for connecting to a reference ground on the secondary side of a transformer in a switching power supply system. For example, the pin RT may be connected to a reference ground on the secondary side of a transformer in the switching power supply system via a negative temperature system (NTC) resistor to enable temperature detection and over-temperature protection of the switching power supply system.
The chip supply pin (i.e., pin VDD) for connecting to ground reference on the secondary side of the transformer in the switching power supply system. For example, the pin VDD may be connected to a reference ground on the secondary side of a transformer in the switching power supply system via a supply capacitor to enable chip internal power supply of the PD protocol chip 202.
A voltage input pin (i.e., pin VIN) for connecting an output voltage bus of the switching power supply system. For example, the pin VIN may be connected to an output voltage bus of the switching power supply system via an output voltage detection resistor (i.e., a resistor for detecting an output voltage of the switching power supply system) to detect the output voltage of the switching power supply system and implement different output voltage control functions.
A chip ground pin (i.e., pin GND) connected to a ground reference for providing a ground reference internal to the PD protocol chip 202.
A general purpose input output extension pin (i.e., pin GPIO) for extending an input or output pin of the PD protocol chip 202.
As shown in fig. 2, in some embodiments, the PD protocol chip 202 according to the embodiment of the present invention may further include one or more of the following functional modules:
a gate driver module connected to the output switch for enabling gate driving of the output switch.
A protocol control module connected to the data communication pins (e.g., pin DP and pin DN) and the channel configuration pins (e.g., pin CC1 and pin CC2) for enabling communication between the switching power supply system and the charged device, and for enabling different voltage outputs, current outputs, and protection controls based on commands from the charged device.
A voltage/current control module connected to one or more of pins OPTO, VFB, and IFB for implementing one or more of the following functions: the system-level loop control of the switching power supply system is realized according to the voltage at the pin OPTO, the output constant-voltage loop compensation of the switching power supply system is realized according to the voltage at the pin VFB, and the output constant-current loop compensation of the switching power supply system is realized according to the voltage at the pin IFB.
And the temperature detection and over-temperature protection module is connected to the pin RT and is used for realizing the temperature detection and over-temperature protection of the switching power supply system according to the voltage at the pin RT.
An under-voltage-locked/low dropout linear regulator (UVLO/LDO) module, connected to the pin VIN and the pin VDD, for enabling or disabling the PD protocol chip 202 according to the voltage at the pin VIN (e.g., enabling the PD protocol chip 202 when the voltage at the pin VIN is greater than a predetermined under-voltage-locked voltage, and otherwise disabling the PD protocol chip 202), and providing a chip internal power supply based on the voltage at the pin VDD.
A protection control module, configured to implement a protection function when the PD protocol chip 202 fails, so as to avoid damage to the PD protocol chip 202.
A logic control module, connected to one or more of the protocol control module, the gate driver module, the temperature detection and over-temperature protection module, the voltage/current control module, the current detection module, and the protection control module, for implementing logic control of each functional module inside the PD protocol chip 202.
A Micro Control Unit (MCU) module connected to the pin GPIO for implementing internal control and GPIO extension functions of the PD protocol chip 202.
Fig. 3 shows a circuit diagram of a flyback switching power supply 200 employing a PD protocol chip according to an embodiment of the present invention. As can be seen from fig. 3, since the PD protocol chip 202 integrates the positive pin and the negative pin originally connected to the output current detection resistor of the switching power supply system 100, the current detection resistor, the output switch for controlling whether to provide the output voltage to the charged device, and the driving pin, the switching power supply system 200 includes fewer components and is lower in cost than the switching power supply system 100.
It should be noted that the PD protocol chip according to the embodiment of the present invention may be applied not only to a flyback switching power supply, but also to a switching power supply system with various architectures such as FORWARD (FORWARD), HALF-bridge (HALF-bridge), FULL-bridge (FULL-bridge), and the like.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A power transfer protocol chip for a switching power supply system, comprising:
the current detection pin is used for connecting an output current detection resistor in a switching power supply system, wherein the output current detection resistor is arranged in the power transmission protocol chip;
an output voltage bus pin for receiving an output voltage of the switching power supply system from an output voltage bus of the switching power supply system;
an output voltage derivation pin for supplying an output voltage of the switching power supply system to the charged device; and
and an output switch, wherein a drain of the output switch is connected to the output voltage bus pin, a source of the output switch is connected to the output voltage derivation pin, and when the output switch is in a conduction state, an output voltage of the switching power supply system is supplied to the charged device via the output voltage bus pin, the output switch, and the output voltage derivation pin.
2. The power transfer protocol chip of claim 1, further comprising one or more of the following pins:
the data communication pin is used for connecting the data communication pin of the universal serial bus interface;
the channel configuration pin is used for connecting the channel configuration pin of the universal serial bus interface;
the optical coupler driving pin is used for connecting the output end of an optical coupler in a switch power supply system;
the voltage loop compensation pin is used for connecting a reference ground of a secondary side of a transformer in the switching power supply system;
the current loop compensation pin is used for connecting a reference ground of a secondary side of a transformer in the switching power supply system;
the over-temperature protection pin is used for connecting a reference ground of a secondary side of a transformer in the switching power supply system;
the chip power supply pin is used for connecting a reference ground of a secondary side of a transformer in the switching power supply system;
the voltage input pin is used for connecting an output voltage bus of the switching power supply system;
the chip grounding pin is connected with a reference ground and used for providing the reference ground inside the power transmission protocol chip; and
and the universal input and output extension pin is used for extending the input or output pin of the power transmission protocol chip.
3. The power transfer protocol chip of claim 2, further comprising one or more of the following modules:
a gate driver module connected to the output switch;
a protocol control module connected to the data communication pin;
the voltage/current control module is connected to one or more pins of the optocoupler driving pin, the voltage loop compensation pin and the current loop compensation pin;
the temperature detection and over-temperature protection module is connected to the over-temperature protection pin;
the under-voltage locking/low dropout linear regulator module is connected to the voltage input pin and the chip power supply pin;
a protection control module;
the logic control module is connected to one or more functional modules in the protocol control module, the grid driver module, the temperature detection and over-temperature protection module, the voltage/current control module, the current detection module and the protection control module; and
and the micro control unit module is connected to the universal input/output extension pin.
4. The power transfer protocol chip of claim 3, wherein the current sense module comprises an output current sense resistor.
5. The power transfer protocol chip of claim 3, further comprising:
and the detection switch is connected to the current detection module.
6. A switching power supply system comprising a power transfer protocol chip according to any one of claims 1-5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121255267.7U CN216531085U (en) | 2021-06-04 | 2021-06-04 | Switch power supply system and power transmission protocol chip thereof |
| TW110209485U TWM624994U (en) | 2021-06-04 | 2021-08-11 | Switching power supply system and its power transfer protocol chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121255267.7U CN216531085U (en) | 2021-06-04 | 2021-06-04 | Switch power supply system and power transmission protocol chip thereof |
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| Publication Number | Publication Date |
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| CN216531085U true CN216531085U (en) | 2022-05-13 |
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| CN202121255267.7U Active CN216531085U (en) | 2021-06-04 | 2021-06-04 | Switch power supply system and power transmission protocol chip thereof |
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| CN (1) | CN216531085U (en) |
| TW (1) | TWM624994U (en) |
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- 2021-06-04 CN CN202121255267.7U patent/CN216531085U/en active Active
- 2021-08-11 TW TW110209485U patent/TWM624994U/en unknown
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