TW201947417A - Universal serial bus apparatus with variable voltage - Google Patents

Abstract

The present application discloses a universal serial bus (USB) apparatus with variable voltage which utilizes a digital-to-analog converter (DAC) coupled with a divider resistor to serve as a dual role port under type-C communication protocol of universal serial bus, where the DAC is regarded as a voltage signal generation unit for generating the variable voltage. When the USB apparatus is identified as a discharge apparatus, the voltage signal generation unit generates a particular non-zero partial voltage at a configuration channel pin electrically connected to an exterior apparatus, and thereby the exterior apparatus confirms the discharge capacity of the USB apparatus. When the USB apparatus is identified as a charged apparatus, the configuration channel pin gained a partial voltage from the exterior apparatus and the divider resistor is grounded. The present application reduces an amount of necessary elements and volume of the apparatus and preserves reasonable configuration for power supply.

Description

Variable-voltage universal serial bus device

The invention relates to a universal serial bus device, in particular to a variable voltage universal serial bus device.

In the communication protocol specification of the type-C universal serial bus, a dual-purpose (Dual Role Port) type-C universal serial bus device judges the serial connection through the electrical connection between the configuration channel pins. Whether the external device is a correct discharge device or a charged device, and at the same time, it can also switch itself between the dual-use. When the type-C universal serial bus device is identified as a charged device, it can confirm the discharge capability of the external device through the partial voltage obtained at the configuration channel interface; on the other hand, when it is identified as a discharge device It can also provide a corresponding divided voltage at the pin of the configuration channel according to its own power supply capability, so that the external device knows its discharge capability.

When the existing type-C universal serial bus device is identified as a discharge device, a pull-up resistor is required (if it is corresponding to three different discharge capabilities of the type-C universal serial bus agreement, three pull-up resistors Rp are required , And switch through the switch); when the existing type-C universal serial bus device is identified as a charged device, a pull-down resistor and switch are required to correspond to the ground state. Therefore, the existing type-C universal serial bus device needs to use at least four resistors and four switches. This will not be conducive to reducing the cost of materials and reducing the volume of the product. Gradually lose competitiveness.

Therefore, the present invention discloses a general-purpose serial bus device with variable voltage to solve the problems of high material cost and large product volume.

The invention discloses a universal serial bus device of variable voltage, which comprises a connection interface, a voltage signal generating unit and a voltage dividing resistor. The connection interface is used to electrically connect an external device and includes a first configuration channel pin, and the first configuration channel pin is electrically connected to a second configuration channel pin of the external device to enable the universal serial bus device. Recognized as a discharge device or a charged device. The voltage signal generating unit is used to generate a plurality of different voltage signals. The voltage dividing resistor is electrically connected between the first configuration channel pin and the voltage signal generating unit. When the universal serial bus device is identified as a discharge When the device is installed, a voltage signal generated by the voltage signal generating unit is a non-zero voltage and the signal generating unit provides the first configuration channel pin a first divided voltage; when the universal serial bus device is identified as a charged device At this time, a voltage signal generated by the voltage signal generating unit is zero voltage and the first configuration channel pin obtains a second divided voltage.

The variable-voltage universal serial bus device disclosed in the present invention further includes a control unit, which is connected between the sub-voltage group and the first configuration channel pin for detecting the first sub-circuit. Or the second partial pressure.

In the universal serial voltage bus device of variable voltage disclosed in the present invention, when a voltage signal generated by the voltage signal generating unit is the zero voltage, the voltage dividing resistor is grounded and the control unit detects a rise from zero voltage The second partial pressure comes.

In the universal serial bus device of variable voltage disclosed in the present invention, when a voltage signal generated by the voltage signal generating unit is the non-zero voltage, the control unit detects the first non-zero voltage drop. Partial pressure.

In the variable-voltage universal serial bus device disclosed in the present invention, the voltage signal generating unit is configured to generate a plurality of voltage signals having a non-zero voltage, and the voltage signal generating unit provides the first configuration channel pin. The first divided voltage is substantially 45% to 55% of the voltage value of the voltage signal generated by the voltage signal generating unit.

In the variable-voltage universal serial bus device disclosed in the present invention, the first divided voltage is substantially 50% of a voltage value of the voltage signal generated by the voltage signal generating unit.

In the variable-voltage universal serial bus device disclosed in the present invention, the voltage signal generating unit is electrically connected to the first configuration channel pin only through the voltage dividing resistor.

In the variable-voltage universal serial bus device disclosed in the present invention, the voltage signal generating unit is a digital analog converter.

In the variable-voltage universal serial bus device disclosed in the present invention, the connection interface further has a third configuration channel pin, and the third configuration channel pin is used to be electrically connected to an external device. A fourth configuration channel pin, so that the universal serial bus device is identified as the discharge device or the charged device. The universal serial bus device further has a second voltage dividing resistor, and the second voltage dividing resistor is electrically connected between the third configuration channel pin and the voltage signal generating unit. When the universal serial bus device is identified as the discharge device, the voltage signal generated by the voltage signal generating unit is a non-zero voltage, and the signal generating unit provides the third configuration channel pin to the first divided voltage; when When the universal serial bus device is identified as the charged device, another voltage signal generated by the voltage signal generating unit is zero voltage, and the third configuration channel pin obtains the second divided voltage.

The universal serial voltage bus device with variable voltage disclosed by the present invention can be used not only as a device with an upstream data flow port (UFP), but also as a device with a downstream data flow port (DFP) In other words, the universal serial bus device is a dual role port (DRP) device. In addition, the universal serial bus device disclosed in the embodiment of the present invention also has an operation mechanism conforming to the communication protocol specified by the type-C universal serial bus communication protocol; in other words, the universal serial bus device is connected through the first configuration channel. The pin is electrically connected to the second configuration channel pin of an external device. In addition to confirming that the external device is the correct discharge device or device being charged, the universal serial bus device can also be switched between the dual-use. At the same time, when the universal serial bus device is identified as a charged device, the universal serial bus device can also confirm the discharge capability of the external device through the partial voltage obtained at the interface of the first configuration channel; When the universal serial bus device is identified as a discharge device, the universal serial bus device may also provide a corresponding partial voltage at the pin of the second configuration channel of the external device according to its own power supply capability, so that the The external device knows the discharge capability of the universal serial bus device. The variable-voltage universal serial bus device disclosed by the present invention can achieve the above functions by using only a digital analog converter to generate different voltage signals and a voltage divider resistor, and greatly reduces material costs and printed circuits. The board area reduces the number of components and saves space.

Certain names are used in the description and the scope of the invention patent to refer to specific elements. Those of ordinary skill in the art should understand that manufacturers may refer to the same component by different names. The scope of this specification and the patent application for invention does not use the difference in names as a way to distinguish components, but rather uses the differences in functions and structures of components as criteria for distinguishing components. "Inclusion" mentioned throughout the specification and the scope of the patent application for invention is an open-ended term and should be interpreted as "including but not limited to." In addition, the term "coupled" or "connected" includes any direct or indirect means of electrical or structural connection. Therefore, if the first device is described as being coupled / connected to the second device, it means that the first device can be electrically / structured to the second device directly, or indirectly electrically / structured to be connected to the second device through other devices or connection means. Device.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a variable-voltage universal serial bus device according to an embodiment of the present invention. The universal serial bus device 1 includes a connection interface 11, a voltage signal generating unit 12, and a voltage dividing resistor 13. The connection interface 11 is used to electrically connect the connection interface 21 of the external device 2. The connection interface 11 includes a first configuration channel pin 111, and the connection interface 21 of the external device 2 includes a second configuration channel pin 212. Therefore, the connection interface 11 is electrically connected to the second configuration channel pin 212 of the external device 2 through the first configuration channel pin 111, so that the universal serial bus device 1 is identified as a charged device (as shown in FIG. 2) or a discharge Device (as shown in Figure 3). The voltage signal generating unit 12 is used to generate a variety of different voltage signals. In the embodiment of the present invention, the voltage signal generating unit 12 may be a control system existing at the back end of the universal serial bus device 1, a power controller of the host device, or Digital to Analog Converter (DAC). The voltage dividing resistor 13 is electrically connected between the first configuration channel pin 111 and the voltage signal generating unit 12. It should also be noted that a control unit 14 may be provided between the voltage dividing resistor 13 and the first configuration channel pin 111. The control unit 14 may be electrically connected to the voltage dividing resistor 13 and the first configuration channel pin 111. To detect the divided voltage obtained by the first configuration channel pin 111, but the present invention is not limited to this; the control unit 14 may be, but is not limited to, a computer, a Central Processing Unit (CPU), and a microcontroller ( Microcontroller (MCU) or Digital Signal Processor (DSP), electricity meter or oscilloscope, etc.

The following describes the two states of the universal serial bus device 1 according to the embodiment of the present invention, which are identified as a type of a charged device and as a type of a discharge device. The universal serial bus device 1 and the external device 2 according to the embodiment of the present invention may be a type-C universal serial bus device and an external device having a type-C universal serial bus device, respectively; communication in the type-C universal serial bus Under the agreement, when the universal serial bus device 1 is identified as a discharge device, the voltage divider resistor 13 is used as a pull-up resistor, and when the universal serial bus device 1 is identified as a device to be charged, the voltage divider resistor 13 is used as a type Pull-down resistor. When the universal serial bus device 1 is used as an interface device conforming to the communication protocol of the type-C universal serial bus, since the resistance value of the pull-down resistor of the communication protocol of the type-C universal serial bus is 5.1 kohm, it is preferably The resistance value of the voltage dividing resistor 13 is 5.1 kiloohms.

Please refer to FIG. 2, which is a schematic diagram of a state when the universal serial bus device 1 according to an embodiment of the present invention is identified as a discharge device. When the universal serial bus device 1 is connected to the external device 2, the first configuration channel pin 111 of the connection interface 11 of the universal serial bus device 1 and the second configuration channel pin 212 of the connection interface 21 of the external device 2 are electrically connection. At this time, since the external device 2 is a device (or a charged device) having an upstream data flow port (UFP, Upstream Facing Port), the first configuration channel pin 111 and the second configuration channel pin 212 are electrically connected according to The matching status of the universal serial bus device 1 is recognized as a discharge device. The universal sequence bus device 1 identified as the discharge device can provide one or more discharge or charging capabilities of different voltages, and the external device 2 can confirm the universal sequence by the partial voltage value obtained at the second configuration channel pin 212 The discharge capacity (ie, the maximum current discharge capacity) of the busbar device 1.

As a discharge device, the voltage signal generating unit 12 of the universal serial bus device 1 can generate a non-zero voltage signal V0 such as 3.38 volts, 1.88 volts, or 0.83 volts according to the power supply capability of the universal serial bus device 1. Because there is only one voltage dividing resistor 13 between the first configuration channel pin 111 and the voltage signal generating unit 12, and if the resistance value of the voltage dividing resistor 13 is 5.1 kiloohms, for an external device connected to the universal serial bus device 1 2 (with a pull-down resistor with a resistance value of 5.1 kiloohms), the non-zero voltage voltage signal V0 is divided by the voltage dividing resistor 13 and the first divided voltage V1 provided at the first configuration channel pin 111 is 1.69 Volts, 0.94 volts, or 0.41 volts (45% to 55% of the voltage value of the non-zero voltage signal V0 generated by the voltage signal generating unit 12; in other words, in a preferred embodiment, the first divided voltage V1 (The theoretical value is substantially half the voltage value of the voltage signal V0). The external device 2 can confirm the discharge capacity of the universal serial bus device 1 through the partial voltage value of the first partial voltage V1. The corresponding charging current is 3 amps, 1.5 amps or the preset universal serial bus device charging power (Default USB Power).

In actual application, before the universal serial bus device 1 is matched (or electrically connected) with the external device 2, the initial voltage signal V0 generated by the voltage signal generating unit 12 of the universal serial bus device 1 will be at zero voltage and one Rotation between non-zero voltages. If an external device 2 with an uplink data port is electrically connected to the first configuration channel pin 111 of the universal serial bus device 1, the voltage signal V0 generated by the voltage signal generating unit 12 and reaching the non-zero voltage can be compared with the external The zero voltage of the device 2 establishes a voltage difference. When the universal serial bus device 1 matches the external device 2 through the voltage difference, the first configuration channel pin 111 obtains the first divided voltage V1 obtained from the voltage signal V0 through the voltage dividing resistor 13. Therefore, the control unit 14 connected between the voltage dividing resistor 13 and the first configuration channel pin 111 detects the first divided voltage V1 (and the corresponding voltage drop) from the voltage signal V0, and accordingly The universal serial bus device 1 is set (and identified) as a discharge device, so that the universal serial bus device 1 supplies power to the external device 2. Under the type-C universal serial bus communication protocol, the control unit can regulate the voltage signal generating unit 12 to generate a corresponding 3.38 volt, 1.88 volt, or 0.38 volt voltage signal V0 according to the power supply capability of the universal serial bus device 1. The power supply of the universal serial bus device 1 is limited to a reasonable range.

Please refer to FIG. 3, which is a schematic diagram of a state when the universal serial bus device 1 according to an embodiment of the present invention is identified as a type of charged device. When the external device 2 connected to the universal serial bus device 1 is a device having a downstream data flow port (DFP, Downstream Facing Port) (or a charging device providing voltage), it is connected through the first configuration channel of the electrical connection Pin 111 and the second configuration channel pin 212 are judged, so that the universal serial bus device 1 is recognized as a charged device and the voltage dividing resistor 13 is used as a pull-down resistor. The voltage signal generating unit 12 generates a voltage signal V0 of zero voltage. This corresponds to grounding the pull-down resistor to make the universal serial bus device 1 be a charged device.

The universal serial bus device 1 as the charged device also confirms the discharge capacity (ie, the maximum current discharge capacity) of the external device 2 through the second partial voltage V2 at the first configuration channel pin 111. This confirmation process is the same as the confirmation described earlier The process has the same operating mechanism: the external device 2 can provide a specific voltage, or provide different voltages according to its own power supply capacity, and generate a second divided voltage V2 at the first configuration channel pin 111, a universal serial bus The device 1 confirms the discharge capability of the external device 2 according to the voltage value of the second partial voltage V2.

In practical applications, if an external device 2 with a downlink data port is electrically connected to the first configuration channel pin 111 of the universal serial bus device 1, since the external device 2 generates a non-zero voltage signal, the non-zero voltage signal may be A voltage difference is established with respect to the voltage signal V0 reaching the zero voltage generated by the voltage signal generating unit 12 of the universal serial bus device 1. When the external device 2 matches the universal serial bus device 1 by the voltage difference, the first configuration channel pin 111 obtains the second divided voltage V2 provided by the external device 2. Therefore, the control unit 14 connected between the voltage dividing resistor 13 and the first configuration channel pin 111 detects the second voltage division V2 (and the corresponding voltage increase) from the zero voltage rise, and accordingly uses the general voltage The serial bus device 1 is set (and identified) as a charged device, so that the external device 2 can supply power to the universal serial bus device 1. Under the type-C universal serial bus communication protocol, the external device 2 generates the non-zero voltage signal with different voltage values according to its own power supply capability, and the control unit 14 of the universal serial bus device 1 according to the corresponding second partial voltage V2 evaluates the discharge capability of the external device 2.

As described above, the universal serial bus device 1 according to the embodiment of the present invention can be used not only as a device having an upstream data flow port (UFP), but also as a device having a downstream data flow port (DFP) Therefore, the universal serial bus device 1 of the present invention may further be a device with a dual-purpose interface (DRP, Dual Role Port).

Under the specifications of the type-C universal serial bus communication protocol, the universal serial bus device 1 is electrically connected to the second configuration channel pin 212 of the external device 2 through the first configuration channel pin 111, except that the external The device 2 is a correct discharging device or a charged device, and can also be switched between dual-use according to the confirmation result. When the universal serial bus device 1 is identified as a discharge device, the universal serial bus device 1 may also provide a corresponding first partial voltage V1 at the first configuration channel pin 111 according to its own power supply capability, so that the external device 2 Know the discharge capability of the universal serial bus device 1; when the universal serial bus device 1 is identified as a charged device, the universal serial bus device 1 can also obtain the second score obtained at the first configuration channel pin 111 Press V2 to confirm the discharge capability of the external device 2.

Please refer to FIG. 4, which is a schematic structural diagram of a variable-voltage universal serial bus device according to another embodiment of the present invention. In another embodiment of the present invention, the connection interface 11 of the universal serial bus device 1 further has a third configuration channel pin 113, and the third configuration channel pin 113 is used to be electrically connected to another external device 3.的 连接 Interface 31. The connection interface 31 of the other external device 3 has a fourth configuration channel pin 314. Therefore, the connection interface 11 of the universal serial bus device 1 is connected to the fourth configuration channel of the other external device 3 through the third configuration channel pin 113. The pin 314 is electrically connected, so that the universal serial bus device 1 is identified as a charged device or a discharge device. The universal serial bus device 1 further has a second voltage dividing resistor 15, and the second voltage dividing resistor 15 is electrically connected between the third configuration channel pin 113 and the voltage signal generating unit 12. When the universal serial bus device 1 is identified as a discharge device, the voltage signal generating unit 12 generates a non-zero voltage voltage signal V0 and provides a third configuration channel pin 113 with a first divided voltage V1; when the universal serial bus device 1 When it is identified as a charged device, the voltage signal generating unit 12 generates another voltage signal V0 with zero voltage, and the third configuration channel pin 113 obtains the second divided voltage V2.

Since the third configuration channel pin 113 and the second voltage-dividing resistor 15 have the same operating principle as the first configuration channel pin 111 and the voltage-dividing resistor 13 of the previous embodiment, for the sake of brevity, they will not be repeated here. Through the first configuration channel pin 111, the third configuration channel pin 113, and other more configuration channel pins that are simultaneously disposed on the connection interface 11 of the universal serial bus device 1, the universal serial bus according to another embodiment of the present invention The row device 1 can serve the purpose of simultaneously serving as an uplink data flow port device, a downlink data flow port device, or a dual-purpose interface device relative to two or more external devices. A plurality of control units can be respectively disposed between the voltage dividing resistor 13 and the first configuration channel pin 111, the second voltage dividing resistor 15 and the third configuration channel pin 113, and other components of the voltage resistance connected to the configuration channel. Between the feet to achieve the purpose of regulating the universal serial bus device 1. Multiple control units can also be integrated into a main control unit to detect the partial pressure of the pins of each configuration channel to achieve the purpose of regulating the universal serial bus device 1 (as shown in FIG. 4). Not limited to this. It should also be noted that although the external device 2 and the other external device 3 shown in FIG. 4 are respectively used as a charging device and a charged device with respect to the universal serial bus device 1, the external device 2 and the other external device The device 3 may also be a charged device with respect to the universal serial bus device 1 at the same time, and the present invention is not limited thereto.

The variable-voltage universal serial bus device 1 according to the embodiment of the present invention uses a digital analog converter to generate different voltage signals V0, and cooperates with a voltage-dividing resistor 13 to achieve simultaneous use as an uplink data flow port device and a downlink data flow. Port device or dual purpose interface device. Not only has the material cost and printed circuit board area been greatly reduced, but it has also reduced the number of components and saved space. The above are only preferred embodiments of the present invention, and any equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

3‧‧‧ another external device

31‧‧‧Connect Interface

314‧‧‧Fourth configuration channel pin

2‧‧‧ external device

21‧‧‧Connect Interface

212‧‧‧Second configuration channel pin

1‧‧‧Universal Serial Bus Device

11‧‧‧ Connect Interface

111‧‧‧ first configuration channel pin

113‧‧‧ third configuration channel pin

12‧‧‧Voltage signal generating unit

13‧‧‧divider

14‧‧‧Control unit

15‧‧‧Second Voltage Divider

V0‧‧‧Voltage signal

V1‧‧‧ the first partial pressure

V2‧‧‧Second partial pressure

FIG. 1 is a schematic structural diagram of a variable-voltage universal serial bus device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a state when the universal serial bus device according to the embodiment of the present invention is recognized as a discharge device. FIG. 3 is a schematic diagram of a state when the universal serial bus device according to the embodiment of the present invention is identified as a charged device. FIG. 4 is a schematic structural diagram of a variable-voltage universal serial bus device according to another embodiment of the present invention.

Claims (9)

A variable voltage universal serial bus device includes: a connection interface for electrically connecting an external device, the connection interface having a first configuration channel pin, the first configuration channel pin being used to connect with the external device The second configuration channel pin is electrically connected so that the universal serial bus device is identified as a discharging device or a charged device; a voltage signal generating unit for generating a plurality of different voltage signals; and a voltage dividing resistor , Is electrically connected between the first configuration channel pin and the voltage signal generating unit, wherein when the universal serial bus device is identified as the discharge device, a voltage signal generated by the voltage signal generating unit is non-zero Voltage and the signal generating unit provides a first partial voltage of the first configuration channel pin, wherein when the universal serial bus device is identified as the charged device, another voltage signal generated by the voltage signal generating unit is zero Voltage and the first configuration channel pin obtains a second divided voltage. The universal serial bus device according to claim 1, further comprising a control unit, the control unit is connected between the voltage dividing group and the first configuration channel pin for detecting the first voltage dividing or The second partial pressure. The universal serial bus device according to claim 2, wherein when the another voltage signal generated by the voltage signal generating unit is the zero voltage, the voltage dividing resistor is grounded and the control unit detects that the zero voltage rises and the The second partial pressure. The universal serial bus device according to claim 2, wherein when the voltage signal generated by the voltage signal generating unit is the non-zero voltage, the control unit detects the first point from the non-zero voltage drop. Pressure. The universal serial bus device according to claim 4, wherein the voltage signal generating unit is configured to generate a plurality of voltage signals having a non-zero voltage, and the voltage signal generating unit provides the first branch of the first configuration channel pin. The voltage is substantially 45% to 55% of the voltage value of the voltage signal generated by the voltage signal generating unit. The universal serial bus device according to claim 5, wherein the first divided voltage is substantially 50% of a voltage value of the voltage signal generated by the voltage signal generating unit. The universal serial bus device according to claim 1, wherein the voltage signal generating unit is electrically connected to the first configuration channel pin only through the voltage dividing resistor. The universal serial bus device according to claim 1, wherein the voltage signal generating unit is a digital analog converter. The universal serial bus device according to claim 1, wherein: the connection interface further includes a third configuration channel pin, and the third configuration channel pin is used to be electrically connected to a fourth of another external device. The channel pins are configured so that the universal serial bus device is identified as the discharging device or the charged device, and the universal serial bus device further includes a second voltage dividing resistor electrically connected to the second voltage dividing resistor. Between the third configuration channel pin and the voltage signal generating unit, wherein when the universal serial bus device is identified as the discharge device, the voltage signal generated by the voltage signal generating unit is a non-zero voltage and the signal is generated The unit provides the third configuration channel pin to the first divided voltage, wherein when the universal serial bus device is identified as the charged device, another voltage signal generated by the voltage signal generating unit is zero voltage and the third Configure the channel pins to obtain this second divided voltage.