USB port controller, electronic equipment

Abstract

To provide a system capable of preventing a rush current to a capacitor after connecting a source and a sink.SOLUTION: A receptacle 404 comprises a power source terminal VBUS. A limit resistor R13 is provided on a charging path from the power source terminal VBUS to a capacitor C21. The charging control unit 540 monitors a voltage VBUS_SNK of the power source terminal VBUS; when the voltage VBUS_SNK of the power source terminal VBUS is lower than a predetermined threshold voltage, brings a bypass circuit BYP2 into a non-bypass state; and when the voltage VBUS_SNK of the power source terminal VBUS is higher than the threshold voltage, brings the bypass circuit BYP2 into a bypass state.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a controller for USB Type-C. [Background technology]

[0002] Battery-powered devices such as smartphones, tablet computers, laptop computers, portable audio players, and digital cameras incorporate a charging circuit to charge the rechargeable secondary battery. The charging circuit uses a DC voltage (bus voltage V BUS ) and those that charge secondary batteries based on DC voltage from an external AC adapter.

[0003] A standard called USB Power Delivery (hereinafter referred to as the USB-PD standard) has been established as a power supply system using USB. The USB-PD standard significantly increases the power that can be supplied from 7.5W in the BC standard to a maximum of 100W. Specifically, the USB-PD standard allows for the supply of USB bus voltages higher than 5V (specifically, 9V, 12V, 15V, 20V, etc.), and also allows for a charging current higher than that of the BC standard (specifically, 2A, 3A, 5A, etc.). The USB-PD standard operates on the USB Type-C standard.

[0004] 1 is a block diagram of a power supply system 100R. This power supply system 100R complies with the USB Type-C standard and includes a power supply device (also referred to as a source or host) 200 and a power receiving device (also referred to as a sink or device) 300 connected via a USB cable 106.

[0005] The power supply device 200 is mounted on an electronic device 102. The electronic device 102 may be an AC adapter. The power receiving device 300 is mounted on a battery-powered electronic device 400 such as a smartphone, a tablet terminal, a digital camera, a digital video camera, or a portable audio player.

[0006] Power supply device 200R includes a power supply circuit 202, a power supply-side PD controller (hereinafter referred to as a power supply-side controller) 204, and a bus switch SW1. A USB cable 106 is detachably connected to a receptacle 108 of electronic device 400. Note that there are also charging adapters that omit receptacle 108 and integrate USB cable 106 with electronic device 102.

[0007] Receptacle 108 operates at bus voltage V BUS VBUS terminal for supplying ground voltage V GND The power supply circuit 202 includes a GND terminal and a CC (Configuration Channel) port for supplying a bus voltage V. In reality, two CC ports are provided, but in FIG. 1, only one CC port is shown for simplicity. BUS The power supply circuit 202 receives AC 100V from an external power supply (for example, a commercial AC power supply) not shown, and converts it into a DC bus voltage V BUS The power supply circuit 202 may include an AC / DC converter that converts the bus voltage V BUS is supplied to the power receiving device 300R via the bus line of the USB cable 106 and the bus switch SW1.

[0008] The power supply controller 204 and the power receiving controller 310 are each a port controller for USB Type-C, and are connected to each other via a CC line to provide a communication function. The power supply controller 204 and the power receiving controller 310 control the bus voltage V to be supplied by the power supply device 200R. BUS The power supply controller 204 controls the power supply circuit 202 so that the determined voltage level is obtained, and also controls the on / off state of the bus switch SW1.

[0009] The electronic device 400 includes a battery 402, a receptacle 404, a load (system) circuit 406, and a power receiving device 300R. The battery 402 is a rechargeable secondary battery. The load circuit 406 includes a CPU, memory, a liquid crystal display, an audio circuit, etc. The electronic device 102 is detachably connected to the receptacle 404 via a USB cable 106.

[0010] The power receiving device 300R receives power from the electronic device 102 and charges the charging circuit 302. The power receiving device 300R includes the charging circuit 302, a power receiving side controller 310, and a bus switch SW2.

[0011] The charging circuit 302 receives the bus voltage V from the power supply device 200R via the USB cable 106 and the bus switch SW2. BUS (On the power receiving device 300R side, the bus voltage V BUS_SNK ) to charge the battery 402. The charging circuit 302 is configured with a step-down DC / DC converter, a linear regulator, or a combination thereof.

[0012] The bus voltage V BUS_SNK and the voltage V of the battery 402 BAT The system voltage V SYS The load circuit 406 includes a power management IC (Integrated Circuit), a multi-channel power supply including a DC / DC converter and a linear regulator, a microcomputer, a liquid crystal display, a display driver, and the like.

[0013] The power receiving controller 310 receives the bus voltage V BUS When the electronic device 102 and the electronic device 400 are connected, the power supply controller 204 and the power receiving controller 310 negotiate to determine the bus voltage V BUSThe power receiving side controller 310 also controls the on / off of the bus switch SW2.

[0014] 2 is an operation sequence diagram of the power supply system 100 of FIG. 1. When the power supply device 200R and the power receiving device 300R are connected via the USB cable 106, the power supply controller 204 detects the connection based on the state of the CC port (S100). Specifically, the power receiving controller 310 of the power receiving device 300R waits in a state in which the CC port is pulled down by a pull-down resistor (termination resistor) Rd having a predetermined resistance value. When the power supply device 200R and the power receiving device 300R are connected, a voltage corresponding to the pull-down resistor Rd on the power receiving device 300R side and the state of the power supply device 200R itself is generated in the CC port of the power supply device 200R. This allows the power supply controller 204 of the power supply device 200R to detect the connection of the power receiving device 300R (electronic device 400).

[0015] The power supply device 200R that has detected the connection of the power receiving device 300R turns on the bus switch SW1 (S102) on the condition that the voltage of its own VBUS terminal is lower than a voltage level called vSafe0V, and sets the default bus voltage V BUS When the bus switch SW1 is turned on, the power receiving side controller 310 becomes operable. vSafe0V is specified in the standard as being between 0.0 and 0.8V.

[0016] Next, the power supply controller 204 and the power receiving controller 310 negotiate to determine the bus voltage V BUS (S104). The power supply controller 204 determines the bus voltage V BUS is changed from the initial voltage of 5V to the required voltage (S106).

[0017] Bus voltage V BUSWhen the change to the requested voltage is completed, the power supply controller 204 notifies the power receiving controller 310 of this fact (S108). In response to this notification, the power receiving controller 310 turns on the bus switch SW2 (S110). This causes the charging circuit 302 and the load circuit 406 to receive the bus voltage V BUS is supplied (S112). [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Patent No. 6838879 Summary of the Invention [Problem to be solved by the invention]

[0019] The inventors have considered the connection between a USB Type-C source and a sink and have come to recognize the following problems.

[0020] The USB Type-C standard stipulates that a capacitor C1 of 10 μF or larger must be connected to the source VBUS terminal. It also stipulates that a capacitor C2 of 1 μF to 10 μF must be connected to the sink VBUS terminal. In DRP (Dual Role Power), which can switch between source and sink, a capacitor C1 of 10 μF or larger must be connected to the VBUS terminal.

[0021] After the source and sink are connected with a USB cable, the power supply circuit 202 supplies the 5V power supply voltage V BUS When the generation of the current begins and the bus switch SW1 is turned on, an inrush current flows through the capacitor C1 on the source side and the capacitor C2 on the sink side.

[0022] An aspect of the present disclosure has been made in view of such problems, and one exemplary purpose thereof is to provide a system capable of preventing inrush current to a capacitor after a source and a sink are connected. [Means for solving the problem]

[0023] One aspect of the present disclosure relates to a USB port controller that can be installed in a sink that supports USB (Universal Serial Bus) PD (Power Delivery). The sink on which the USB port controller is installed includes a receptacle including a power terminal, a capacitor, a limiting resistor connected between the power terminal and the capacitor, and a bypass circuit that is switchable between a bypass state and a non-bypass state and bypasses the limiting resistor in the bypass state. The USB port controller includes a charging control unit that monitors the voltage of the power terminal and switches the bypass circuit to the non-bypass state when the voltage of the power terminal is lower than a predetermined threshold voltage and switches the bypass circuit to the bypass state when the voltage of the power terminal is higher than the threshold voltage.

[0024] Another aspect of the present disclosure relates to an electronic device that functions as a sink compatible with USB (Universal Serial Bus) PD (Power Delivery), comprising: a USB (Universal Serial Bus) receptacle including a power terminal, an internal circuit, a capacitor, an input switch connected between the power terminal and the internal circuit, a limiting resistor connected between the power terminal and the capacitor, a bypass circuit that is switchable between a bypass state and a non-bypass state and bypasses the limiting resistor in the bypass state, and a USB port controller that monitors the voltage of the power terminal, and switches the bypass circuit to the non-bypass state when the voltage of the power terminal is lower than a predetermined threshold voltage, and switches the bypass circuit to the bypass state when the voltage of the power terminal is higher than the threshold voltage.

[0025] Another aspect of the present disclosure relates to a USB port controller that can be mounted on a source that supports USB (Universal Serial Bus) Type-C. The source on which the USB port controller is mounted includes a receptacle having a power terminal and a CC (Configuration Channel) terminal, a power supply circuit, an output switch provided between the power supply circuit and the power terminal, a capacitor, a limiting resistor connected between the power terminal and the capacitor, and a bypass circuit that is switchable between a bypass state and a non-bypass state and bypasses the limiting resistor in the bypass state. The USB port controller includes a charging control unit that monitors the voltage of the power supply terminal and switches the bypass circuit to the non-bypass state when the voltage of the power supply terminal is lower than a predetermined threshold voltage and switches the bypass circuit to the bypass state when the voltage of the power supply terminal is higher than the threshold voltage, and a switch control unit that controls the output switch based on the state of the CC terminal.

[0026] Yet another aspect of the present disclosure relates to an electronic device that serves as a source compatible with USB (Universal Serial Bus) Type-C. The electronic device includes a receptacle having a power terminal and a CC (Configuration Channel) terminal, a power circuit, an output switch provided between the power circuit and the power terminal, a capacitor, a limiting resistor connected between the power terminal and the capacitor, a bypass circuit that is switchable between a bypass state and a non-bypass state and bypasses the limiting resistor in the bypass state, and a USB port controller that monitors the voltage of the power terminal, and switches the bypass circuit to the non-bypass state when the voltage of the power terminal is lower than a predetermined threshold voltage and switches the bypass circuit to the bypass state when the voltage of the power terminal is higher than the threshold voltage, and controls the output switch based on the state of the CC terminal. [Effects of the Invention]

[0027] According to an aspect of the present disclosure, after the source and sink are connected, it is possible to prevent an inrush current to the capacitor and reduce losses after power supply begins. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a block diagram of a power supply system. [Figure 2] FIG. 2 is an operation sequence diagram of the power supply system of FIG. [Figure 3] FIG. 3 is a block diagram of a power supply system according to the embodiment. [Figure 4] FIG. 4 is a diagram illustrating the operation when the power supply device and the power receiving device are connected in the power supply system of FIG. [Figure 5] FIG. 5 is a circuit diagram of a part of a power supply device according to the first modification. [Figure 6] FIG. 6 is a circuit diagram of a part of a power supply device according to the second modification. [Figure 7] FIG. 7 is a circuit diagram of a part of a power supply device according to the third modification. [Figure 8] FIG. 8 is a circuit diagram of a part of a power supply device according to the fourth modification. [Figure 9] FIG. 9 is a circuit diagram of a part of a power supply device according to the fifth modification. [Figure 10] FIG. 10 is a circuit diagram of a part of a power supply device according to the sixth modification. [Figure 11] FIG. 11 is a circuit diagram of a part of a power supply device according to the seventh modification. [Figure 12] FIG. 12 is a circuit diagram of a part of a power supply device according to the eighth modification. DETAILED DESCRIPTION OF THE INVENTION

[0029] (Outline of the embodiment) A summary of some exemplary embodiments of the present disclosure is provided. This summary is intended to provide a simplified overview of some concepts of one or more embodiments in order to provide a basic understanding of the embodiments as a prelude to the more detailed description that follows. It is not intended to limit the scope of the invention or disclosure. This summary is not an exhaustive overview of all possible embodiments, and is not intended to identify key elements of all embodiments or to delineate the scope of some or all aspects. For convenience, the term "one embodiment" may refer to one embodiment (example or variant) or multiple embodiments (examples or variants) disclosed herein.

[0030] A USB port controller according to one embodiment can be mounted on a sink compatible with USB (Universal Serial Bus) PD (Power Delivery). The sink on which the USB port controller is mounted includes a receptacle including a power terminal, a capacitor, a limiting resistor connected between the power terminal and the capacitor, and a bypass circuit that is switchable between a bypass state and a non-bypass state and bypasses the limiting resistor in the bypass state. The USB port controller includes a charge control unit that monitors the voltage of the power terminal and switches the bypass circuit to the non-bypass state when the voltage of the power terminal is lower than a predetermined threshold voltage and switches the bypass circuit to the bypass state when the voltage of the power terminal is higher than the threshold voltage.

[0031] With this configuration, when the capacitor voltage, i.e., the voltage at the power supply terminal, is low and an inrush current may occur, the bypass circuit is placed in a non-bypass state to prevent the inrush current.When the capacitor is fully charged and the voltage at the power supply terminal is sufficiently high and no inrush current occurs, the bypass circuit is placed in a bypass state, thereby reducing loss due to the limiting resistor during normal power supply.

[0032] In one embodiment, the bypass circuit may include a selector having a first terminal, a second terminal, and a third terminal, the first terminal being connected to a power supply terminal, the second terminal being connected to a capacitor, and the third terminal being connected to a limiting resistor. In a bypass state, electrical continuity may be established between the first terminal and the second terminal, and in a non-bypass state, electrical continuity may be established between the first terminal and the third terminal.

[0033] In one embodiment, one end of the limiting resistor may be connected to the power supply terminal and the other end of the limiting resistor may be connected to the capacitor. The bypass circuit may include a first switch connected in parallel with the limiting resistor. The first switch may be on in the bypass state and off in the non-bypass state.

[0034] In one embodiment, the bypass circuit may further include a second switch connected in series with the limiting resistor between the power supply terminal and the capacitor, wherein the second switch may be off in the bypass state and on in the non-bypass state.

[0035] In one embodiment, the bypass circuitry may be built into the USB port controller.

[0036] In one embodiment, the limiting resistor may be built into the USB port controller.

[0037] In one embodiment, the USB port controller may be monolithically integrated on a single semiconductor substrate. "Monolithic integration" includes cases where all circuit components are formed on a semiconductor substrate, or where the main circuit components are monolithically integrated, and some resistors and capacitors for adjusting circuit constants may be provided outside the semiconductor substrate. Integrating the circuit on a single chip reduces the circuit area and maintains uniform characteristics of the circuit elements.

[0038] An electronic device according to one embodiment includes a USB (Universal Serial Bus) receptacle including a power terminal, an internal circuit, a capacitor, an input switch connected between the power terminal and the internal circuit, a limiting resistor connected between the power terminal and the capacitor, a bypass circuit that is switchable between a bypass state and a non-bypass state and that bypasses the limiting resistor in the bypass state, and a USB port controller that monitors the voltage of the power terminal and places the bypass circuit in the non-bypass state when the voltage of the power terminal is lower than a predetermined threshold voltage and places the bypass circuit in the bypass state when the voltage of the power terminal is higher than the threshold voltage.

[0039] With this configuration, when the capacitor voltage, i.e., the voltage at the power supply terminal, is low and an inrush current may occur, the bypass circuit is placed in a non-bypass state to prevent the inrush current.When the capacitor is fully charged and the voltage at the power supply terminal is sufficiently high and no inrush current occurs, the bypass circuit is placed in a bypass state, thereby reducing loss due to the limiting resistor during normal power supply.

[0040] A USB port controller according to one embodiment can be mounted on a source compatible with USB (Universal Serial Bus) Type-C. The source on which the USB port controller is mounted includes a receptacle having a power terminal and a CC (Configuration Channel) terminal, a power supply circuit, an output switch provided between the power supply circuit and the power terminal, a capacitor, a limiting resistor connected between the power terminal and the capacitor, and a bypass circuit switchable between a bypass state and a non-bypass state and bypassing the limiting resistor in the bypass state. The USB port controller includes a charge control unit that monitors the voltage of the power supply terminal and switches the bypass circuit to the non-bypass state when the voltage of the power supply terminal is lower than a predetermined threshold voltage and switches the bypass circuit to the bypass state when the voltage of the power supply terminal is higher than the threshold voltage, and a switch control unit that controls the output switch based on the state of the CC terminal.

[0041] With this configuration, when the capacitor voltage, i.e., the voltage at the power supply terminal, is low and an inrush current may occur, the bypass circuit is placed in a non-bypass state to prevent the inrush current.When the capacitor is fully charged and the voltage at the power supply terminal is sufficiently high and no inrush current occurs, the bypass circuit is placed in a bypass state, thereby reducing loss due to the limiting resistor during normal power supply.

[0042] In one embodiment, the bypass circuit may include a selector having a first terminal, a second terminal, and a third terminal, the first terminal being connected to a power supply terminal, the second terminal being connected to a capacitor, and the third terminal being connected to a limiting resistor. In a bypass state, electrical continuity may be established between the first terminal and the second terminal, and in a non-bypass state, electrical continuity may be established between the first terminal and the third terminal.

[0043] In one embodiment, one end of the limiting resistor may be connected to the power supply terminal and the other end of the limiting resistor may be connected to the capacitor. The bypass circuit may include a first switch connected in parallel with the limiting resistor. The first switch may be on in the bypass state and off in the non-bypass state.

[0044] In one embodiment, the bypass circuit may further include a second switch connected in series with the limiting resistor between the power supply terminal and the capacitor, wherein the second switch may be off in the bypass state and on in the non-bypass state.

[0045] In one embodiment, the bypass circuitry may be built into the USB port controller.

[0046] In one embodiment, the limiting resistor may be built into the USB port controller.

[0047] In one embodiment, the components may be monolithically integrated on a single semiconductor substrate.

[0048] An electronic device according to one embodiment includes a receptacle having a power supply terminal and a CC (Configuration Channel) terminal, a power supply circuit, an output switch provided between the power supply circuit and the power supply terminal, a capacitor, a limiting resistor connected between the power supply terminal and the capacitor, a bypass circuit that can be switched between a bypass state and a non-bypass state and that bypasses the limiting resistor in the bypass state, and a USB port controller that monitors the voltage of the power supply terminal, and places the bypass circuit in the non-bypass state when the voltage of the power supply terminal is lower than a predetermined threshold voltage, and places the bypass circuit in the bypass state when the voltage of the power supply terminal is higher than the threshold voltage, and controls the output switch based on the state of the CC terminal.

[0049] (Embodiment) Preferred embodiments will be described below with reference to the drawings. The same or equivalent components, parts, and processes shown in each drawing will be given the same reference numerals, and redundant explanations will be omitted where appropriate. Furthermore, the embodiments are examples and do not limit the disclosure and invention, and all features and combinations thereof described in the embodiments are not necessarily essential to the disclosure and invention.

[0050] In this specification, "a state in which component A is connected to component B" includes not only a case in which component A and component B are directly physically connected to each other, but also a case in which component A and component B are indirectly connected to each other via other components that do not substantially affect the electrical connection between them or that do not impair the function or effect achieved by their connection.

[0051] Similarly, "a state in which component C is connected (provided) between component A and component B" includes not only a case in which component A and component C, or component B and component C, are directly connected, but also a case in which they are indirectly connected via other components that do not substantially affect the electrical connection state between them or that do not impair the function or effect achieved by their combination.

[0052] 3 is a block diagram of a power supply system 100 according to an embodiment. The power supply system 100 complies with the USB Type-C standard and includes a power supply device (also referred to as a source) 200 and a power receiving device (also referred to as a sink) 300. The power supply device 200 and the power receiving device 300 are connected via a USB cable 106.

[0053] For example, the power supply device 200 is mounted on an electronic device 102. The electronic device 102 may be an AC adapter. The power receiving device 300 is mounted on a battery-powered electronic device 400 such as a smartphone, a tablet terminal, a digital camera, a digital video camera, or a portable audio player.

[0054] First, the configuration of the source side, that is, the electronic device 102 side, will be described.

[0055] The electronic device 102 includes a power supply device 200 and a receptacle 108. The power supply device 200 includes a power supply circuit 202, a power supply-side PD controller (hereinafter referred to as a power supply-side controller) 600, an output switch (bus switch) SW11, capacitors C11 and C12, a limiting resistor R13, and a bypass circuit BYP1. A USB cable 106 is detachably connected to the receptacle 108 of the electronic device 400. Note that there are also charging adapters that omit the receptacle 108 and have the USB cable 106 integrated with the electronic device 102.

[0056] Receptacle 108 operates at bus voltage V BUS VBUS terminal for supplying ground voltage V GND It includes a GND terminal for supplying (0V) and a CC (Configuration Channel) port.

[0057] The capacitor C12 is connected to the power supply terminal VBUS via a limiting resistor R13. The bypass circuit BYP1 can be switched between a bypass state and a non-bypass state, and bypasses the limiting resistor R13 in the bypass state. In this embodiment, the bypass circuit BYP1 is a selector having a first terminal I1 to a third terminal I3, where the first terminal I1 is connected to the VBUS terminal, the second terminal I2 is connected to the capacitor C12, and the third terminal I3 is connected to the limiting resistor R13. In the bypass state, there is electrical continuity between the first terminal I1 and the second terminal I2, and in the non-bypass state there is electrical continuity between the first terminal I1 and the third terminal I3.

[0058] The power supply circuit 202 supplies the bus voltage V BUS The power supply circuit 202 receives AC 100V from an external power supply (for example, a commercial AC power supply) not shown, and converts it into a DC bus voltage V BUS The power supply circuit 202 may include an AC / DC converter that converts the bus voltage V BUS is supplied to the power receiving device 300 via the bus line of the USB cable 106 and the output switch SW11.

[0059] The power supply controller 600 is a port controller for USB Type-C and USB-PD. The power supply controller 600 and the USB port controller 500 are connected via a CC line.

[0060] The USB port controller 600 is a functional IC that includes a CC pin circuit 610, a processor 630, a charging control unit 640, and a switch control unit 650, and is integrated on a single semiconductor substrate.

[0061] The CC pin circuit 610 includes a pull-up resistor that pulls up the CC pin. This pull-up resistor declares that the power supply device 200 is a source. If the power supply device 200 is a dual role power (DRP) that can switch between a sink and a source, the CC pin circuit 610 is configured to be able to switch between a state in which the CC pin is pulled down (i.e., sink) and a state in which the CC pin is pulled up (i.e., source).

[0062] The CC pin circuit 610 includes a comparator that compares the voltage of the CC pin with a threshold voltage, etc. The connection of the power receiving device 300 via the USB cable 106 is detected by the output of this comparator.

[0063] The USB port controller 500 and the USB port controller 600 can communicate with each other via a CC line, and a transceiver for the communication is included in the CC pin circuit 610 .

[0064] The USB port controller 600 and the USB port controller 500 control the bus voltage V BUS The USB port controller 600 controls the power supply circuit 202 so that the determined voltage level is obtained, and also controls the on / off of the output switch SW11. The processor 630 executes a software program and performs negotiation with the USB port controller 500. The processor 630 may be a microcontroller independent of the USB port controller 600.

[0065] After detecting the connection of the power receiving device 300, the switch control unit 650 controls the bus voltage (output voltage) V BUS_SRC is lower than a predetermined threshold value vSafe0V, the switch control unit 650 turns on the output switch SW11. Furthermore, when the power supply device 200 and the power receiving device 300 are disconnected, the switch control unit 650 turns off the output switch SW11.

[0066] The switch control unit 650 controls the bus voltage V BUS_SRC After the switch control unit 650 turns on the output switch SW11, the switch control unit 650 controls the bypass circuit BYP1 based on the bus voltage V BUS_SRC The threshold voltage V is set at around 5V. TH_SRC The switch control unit 650 keeps the bypass circuit BYP1 in the non-bypass state until the bus voltage V BUS_SRC is the threshold V TH_SRC When the voltage reaches 0 V, the bypass circuit BYP1 is switched to the non-bypass state.

[0067] The above is the configuration on the source side.

[0068] Next, the configuration of the sink side, that is, the electronic device 400, will be described.

[0069] The electronic device 400 includes a battery 402, a receptacle 404, a load (system) circuit 406, and a power receiving device 300. The battery 402 is a rechargeable secondary battery. The load circuit 406 includes a CPU, memory, a liquid crystal display, an audio circuit, etc. The electronic device 102 is detachably connected to the receptacle 404 via a USB cable 106.

[0070] The power receiving device 300 receives power from the electronic device 102 and charges the charging circuit 302. The power receiving device 300 includes the charging circuit 302, a USB port controller 500, an input switch (bus switch) SW21, capacitors C21 and C22, a limiting resistor R23, and a bypass circuit BYP2.

[0071] The charging circuit 302 receives the bus voltage V from the power supply device 200 via the USB cable 106 and the input switch SW21. BUS The power receiving device 300 receives the bus voltage V BUS is also called the input voltage, and V BUS_SNK The charging circuit 302 is composed of a step-down DC / DC converter, a linear regulator, or a combination thereof.

[0072] The bus voltage V BUS_SNK and the voltage V of the battery 402 BAT The system voltage V SYS The load circuit 406 includes a power management IC (Integrated Circuit), a multi-channel power supply including a DC / DC converter and a linear regulator, a microcomputer, a liquid crystal display, a display driver, and the like.

[0073] Capacitors C21 and C22 are connected across the input switch SW21. Capacitor C21 is connected to the VBUS terminal via a limiting resistor R23. The bypass circuit BYP2 can be switched between a bypass state and a non-bypass state, and bypasses the limiting resistor R23 in the bypass state. In this embodiment, the configuration of the bypass circuit BYP2 is the same as that of the bypass circuit BYP1.

[0074] USB port controller 500 is a functional IC that includes CC pin circuit 510, processor 530, charging control unit 540, and switch control unit 550, and is integrated on a single semiconductor substrate. CC pin circuit 510 includes a pull-down resistor that pulls down the CC pin. If power receiving device 300 has a dual power role (DRP: Dual Role Power) that can switch between sink and source, CC pin circuit 510 is configured to be able to switch between a state in which the CC pin is pulled down (i.e., sink) and a state in which it is pulled up (i.e., source).

[0075] As described above, the USB port controller 500 negotiates over the CC lines with the USB port controller 600. The transceiver for communication over the CC lines is included in the CC pin circuit 510.

[0076] The USB port controller 500 receives the bus voltage V BUSWhen the electronic device 102 and the electronic device 400 are connected, the power supply controller 600 and the USB port controller 500 negotiate to determine the bus voltage V BUS The USB port controller 500 also controls the on / off of the input switch SW21. The processor 530 executes a software program and negotiates with the power supply controller 600. The processor 530 may be a microcontroller independent of the USB port controller 500.

[0077] The switch control unit 550 controls the bus voltage V BUS_SRC After the electronic device 102 is connected, the switch control unit 550 controls the bypass circuit BYP2 based on the bus voltage V BUS_SNK The threshold voltage V is set at around 5V. TH_SNK When the bus voltage V is lower than the bypass circuit BYP2, the switch control unit 550 sets the bypass circuit BYP2 in a non-bypass state. BUS_SNK is the threshold V TH_SNK When the voltage reaches 0 V, the bypass circuit BYP1 is switched to the non-bypass state.

[0078] After the bypass circuit BYP2 is switched to the non-bypass state, the switch control unit 550 turns on the input switch SW21. Furthermore, when the power supply device 200 and the power receiving device 300 are disconnected, the switch control unit 550 turns off the input switch SW21.

[0079] The above is the configuration of the power supply system 100. Next, the operation thereof will be described.

[0080] FIG. 4 is a diagram illustrating the operation of the power supply system 100 of FIG. 3 when the power supply device 200 and the power receiving device 300 are connected.

[0081] Before time t0, the power receiving device 300 and the power supply device 200 are not connected. At time t0, the power receiving device 300 and the power supply device 200 are connected via the USB cable 106. The power supply controller 600 of the power supply device 200 detects that the power receiving device 300 is connected based on the state of the CC port.

[0082] In this state, the bus voltage V BUS_SRC is the threshold voltage V TH_SRC Since the voltage Vcc is lower than the Vcc voltage Vcc, the charge control unit 640 puts the bypass circuit BYP1 in a non-bypass state. That is, the capacitor C12 is connected to the VBUS terminal via the limiting resistor R13.

[0083] Also, on the power receiving device 300 side, the bus voltage V BUS_SNK is the threshold voltage V TH_SNK Since the voltage Vcc is lower than the Vcc voltage Vcc, the charging control unit 540 sets the bypass circuit BYP2 in a non-bypass state. That is, the capacitor C21 is connected to the VBUS terminal via the limiting resistor R23.

[0084] At time t1, the switch control section 650 of the power supply controller 600 switches the voltage V BUS_SRC When it detects that the bus voltage V is lower than the threshold value vSafe0V, it turns on the output switch SW11. This causes the capacitor C12 to charge through the limiting resistor R13, and the capacitor C21 to charge through the limiting resistor R23. This prevents inrush current and reduces the bus voltage V BUS_SRC , V BUS_SNK Here, the impedance of the USB cable 106 is assumed to be sufficiently low, and the bus voltage V BUS_SRC and V BUS_SNK are considered to be equal.

[0085] Then, at time t2, the bus voltage V BUS_SRC is the threshold V TH_SRC When the bus voltage V exceeds the threshold voltage V, the charging control unit 640 switches the bypass circuit BYP1 to the bypass state. BUS_SNK is the threshold V TH_SNK , charging control unit 540 switches bypass circuit BYP2 to the bypass state.

[0086] Subsequently, at time t3, the switch control unit 550 turns on the input switch SW21. After time t3, power supply from the power supply device 200 to the power receiving device 300 starts.

[0087] The operation of the power supply system 100 has been described above.

[0088] In the power supply device 200, after the output switch SW11 is turned on, the capacitor C12 is charged via the limiting resistor R13. This prevents an inrush current. After power supply starts at time t3, the limiting resistor R13 is bypassed by the bypass circuit BYP1, reducing power loss.

[0089] In the power receiving device 300, after the output switch SW11 is turned on, the capacitor C21 is charged via the limiting resistor R23. This prevents an inrush current. After power supply starts at time t3, the limiting resistor R23 is bypassed by the bypass circuit BYP2, reducing power loss.

[0090] (Variation) Next, a modified example will be described.

[0091] (Variation 1) 5 is a circuit diagram of a portion of a power supply device 200A according to Modification 1. In this modification, a bypass circuit BYP1 and a limiting resistor R13 are integrated into a USB port controller 600A. A similar modification can be considered for the power receiving device 300A, in which a bypass circuit BYP2 and a limiting resistor R23 can be integrated into a USB port controller 500A.

[0092] (Variation 2) 6 is a circuit diagram of a portion of a power supply device 200B according to Modification 2. In this modification, limiting resistor R13 is integrated into a USB port controller 600B, and bypass circuit BYP1 is external. A similar modification can be considered for the power receiving device 300B, in which limiting resistor R23 is integrated into a USB port controller 500B, and bypass circuit BYP2 is external.

[0093] (Variation 3) 7 is a circuit diagram of a portion of a power supply device 200C according to Modification 3. In this modification, the bypass circuit BYP1 is integrated into the USB port controller 600C, and the limiting resistor R13 is externally attached. A similar modification can be considered for the power receiving device 300C, in which the bypass circuit BYP2 is integrated into the USB port controller 500C, and the limiting resistor R23 is externally attached.

[0094] (Variation 4) 8 is a circuit diagram of a portion of a power supply device 200D according to Modification 4. In this modification, the positions of the limiting resistor R13 and the bypass circuit BYP1 are interchanged. A similar modification can be considered for the power receiving device 300D, in which the limiting resistor R23 and the bypass circuit BYP2 are interchanged.

[0095] (Variation 5) 9 is a circuit diagram of a portion of a power supply device 200E according to Modification 5. In this modification, a capacitor C12 is provided on the higher potential side than the bypass circuit BYP1 and the limiting resistor R13. A similar modification can also be considered for the power receiving device 300E.

[0096] (Variation 6) Fig. 10 is a circuit diagram of a portion of a power supply device 200F according to Modification 6. In this modification, the bypass circuit BYP1 and the limiting resistor R13 in Fig. 9 are interchanged. A similar modification can also be considered for the power receiving device 300F.

[0097] (Variation 7) 11 is a circuit diagram of a portion of a power supply device 200G according to a seventh modification. In this modification, the bypass circuit BYP1 includes two switches SWa and SWb. The first switch SWa is provided in parallel with the limiting resistor R13, and the second switch SWb is connected in series with the limiting resistor R13. A similar modification can also be considered for the power receiving device 300G.

[0098] (Variation 8) Fig. 12 is a circuit diagram of a portion of a power supply device 200H according to Modification 8. In this modification, the bypass circuit BYP1 includes one switch SWa. This configuration is the same as the bypass circuit BYP1 in Fig. 11 except that the switch SWb is omitted. A similar modification can also be considered for the power receiving device 300H.

[0099] The embodiments are merely examples, and it will be understood by those skilled in the art that there are various variations in the combination of each component and each treatment process, and that such variations are also included within the scope of this disclosure or the present invention. [Explanation of symbols]

[0100] 100 Power Supply System 102 Electronic equipment 106 USB cable 108 Receptacle 200 Power Supply Device 202 Power supply circuit 204 Power Supply Controller R13 Limiting resistor BYP1 Bypass circuit SW11 Output Switch C11, C12 capacitors 400 Electronic equipment 402 Battery 404 Receptacle 406 Load circuit 300 Power receiving device 302 Charging circuit 310 Receiving Controller R23 Limiting resistor BYP2 bypass circuit SW21 Input switch C21, C22 capacitors 500 USB Port Controller 510 CC pin circuit 530 processor 540 Charging control unit 550 Switch control section 600 USB Port Controller 610 CC pin circuit 630 processor 640 Charging control unit 650 Switch control section

Claims

1. A USB-Type C port controller that can be mounted on a sink that supports USB (Universal Serial Bus) PD (Power Delivery), The sink equipped with the USB-Type C port controller is: An internal circuit, a receptacle including a power terminal; an input switch connected between the power supply terminal and the internal circuit; a capacitor provided closer to the power supply terminal than the input switch; a limiting resistor connected between the power supply terminal and the capacitor; a bypass circuit that can be switched between a bypass state and a non-bypass state, and that bypasses the limiting resistor in the bypass state; Equipped with The USB-Type C port controller is a charge control unit that monitors the voltage of the power supply terminal, and places the bypass circuit in the non-bypass state when the voltage of the power supply terminal is lower than a predetermined threshold voltage, and places the bypass circuit in the bypass state when the voltage of the power supply terminal exceeds the threshold voltage; a switch control unit that turns on the input switch after the charge control unit puts the bypass circuit into the bypass state; A USB-Type C port controller comprising:

2. The bypass circuit is a selector having a first terminal, a second terminal, and a third terminal, the first terminal being connected to the power supply terminal, the second terminal being connected to the capacitor, and the third terminal being connected to the limiting resistor; 2. The USB Type-C port controller according to claim 1, wherein in the bypass state, conduction is established between the first terminal and the second terminal, and in the non-bypass state, conduction is established between the first terminal and the third terminal.

3. one end of the limiting resistor is connected to the power supply terminal, and the other end of the limiting resistor is connected to the capacitor; the bypass circuit includes a first switch connected in parallel with the limiting resistor; 2. The USB Type-C port controller of claim 1, wherein the first switch is on in the bypass state and off in the non-bypass state.

4. the bypass circuit further includes a second switch connected in series with the limiting resistor between the power supply terminal and the capacitor; 4. The USB Type-C port controller of claim 3, wherein in the bypass state, the second switch is off, and in the non-bypass state, the second switch is on.

5. 5. The USB Type C port controller according to claim 1, wherein the bypass circuit is built into the USB Type C port controller.

6. 5. The USB-Type C port controller according to claim 1, wherein the limiting resistor is built into the USB-Type C port controller.

7. 7. The USB-Type C port controller according to claim 1, which is monolithically integrated on a single semiconductor substrate.

8. An electronic device comprising the USB-Type C port controller according to any one of claims 1 to 7.

9. An electronic device that serves as a sink compatible with USB (Universal Serial Bus) PD (Power Delivery), a USB (Universal Serial Bus) receptacle including a power terminal; An internal circuit, an input switch connected between the power supply terminal and the internal circuit; a capacitor provided closer to the power supply terminal than the input switch; a limiting resistor connected between the power supply terminal and the capacitor; a bypass circuit that can be switched between a bypass state and a non-bypass state, and that bypasses the limiting resistor in the bypass state; a USB-Type C port controller that monitors the voltage of the power supply terminal, places the bypass circuit in the non-bypass state when the voltage of the power supply terminal is lower than a predetermined threshold voltage, places the bypass circuit in the bypass state when the voltage of the power supply terminal exceeds the threshold voltage, and turns on the input switch after placing the bypass circuit in the bypass state; An electronic device comprising:

10. A USB-Type-C port controller that can be mounted on a source that supports USB (Universal Serial Bus) Type-C, The source on which the USB-Type C port controller is installed is: a receptacle having a power terminal and a CC (Configuration Channel) terminal; A power supply circuit; an output switch provided between the power supply circuit and the power supply terminal; a capacitor provided closer to the power supply terminal than the output switch; a limiting resistor connected between the power supply terminal and the capacitor; a bypass circuit that can be switched between a bypass state and a non-bypass state, and that bypasses the limiting resistor in the bypass state; Equipped with The USB-Type C port controller a switch control unit that turns on the output switch when a power receiving device that serves as a sink is detected based on the state of the CC terminal; a charge control unit that monitors a voltage of the power supply terminal, and places the bypass circuit in the non-bypass state when the voltage of the power supply terminal is lower than a predetermined threshold voltage, and places the bypass circuit in the bypass state when the voltage of the power supply terminal exceeds the threshold voltage after the switch control unit turns on the output switch; A USB-Type C port controller comprising:

11. The bypass circuit is a selector having a first terminal, a second terminal, and a third terminal, the first terminal being connected to the power supply terminal, the second terminal being connected to the capacitor, and the third terminal being connected to the limiting resistor; 11. The USB Type-C port controller according to claim 10, wherein in the bypass state, conduction is established between the first terminal and the second terminal, and in the non-bypass state, conduction is established between the first terminal and the third terminal.

12. one end of the limiting resistor is connected to the power supply terminal, and the other end of the limiting resistor is connected to the capacitor; the bypass circuit includes a first switch connected in parallel with the limiting resistor; 11. The USB Type-C port controller of claim 10, wherein the first switch is on in the bypass state and off in the non-bypass state.

13. the bypass circuit further includes a second switch connected in series with the limiting resistor between the power supply terminal and the capacitor; 13. The USB Type-C port controller of claim 12, wherein in the bypass state, the second switch is off, and in the non-bypass state, the second switch is on.

14. 14. The USB Type C port controller according to claim 10, wherein the bypass circuit is built into the USB Type C port controller.

15. 14. The USB Type C port controller according to claim 10, wherein the limiting resistor is built into the USB Type C port controller.

16. 16. The USB-Type C port controller according to claim 10, which is monolithically integrated on a single semiconductor substrate.

17. An electronic device comprising the USB-Type C port controller according to any one of claims 1 to 7.

18. A source electronic device that is compatible with USB (Universal Serial Bus) Type-C, a receptacle having a power terminal and a CC (Configuration Channel) terminal; A power supply circuit; an output switch provided between the power supply circuit and the power supply terminal; a capacitor provided closer to the power supply terminal than the output switch; a limiting resistor connected between the power supply terminal and the capacitor; a bypass circuit that can be switched between a bypass state and a non-bypass state, and that bypasses the limiting resistor in the bypass state; when a power receiving device that serves as a sink is detected based on the state of the CC terminal, the output switch is turned on, and the voltage of the power supply terminal is monitored, and when the voltage of the power supply terminal is lower than a predetermined threshold voltage, the bypass circuit is put into the non-bypass state, and after the output switch is turned on, when the voltage of the power supply terminal exceeds the threshold voltage, the bypass circuit is put into the bypass state, and a USB-Type C port controller is An electronic device comprising:

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