TWM524496U - Power circuit and electronic device using the same - Google Patents

Abstract

A power circuit and an electronic device using the same are provided. The power circuit includes a power receiving circuit, a control circuit and a power transforming circuit. The power receiving circuit couples to an adapter to receive a power voltage and a configuration signal and provides a work voltage and a control reference signal. The control circuit couples to the power receiving circuit to receive the control reference signal and provides a power regulating signal according to the control reference signal. The power transforming circuit couples to the power receiving circuit and the control circuit to receive the work voltage and the power regulating circuit, and transforms the work voltage into a system voltage, wherein the power transforming circuit regulates a current value of the system voltage according to the power regulating signal.

Description

Power circuit and its electronic device

The present invention relates to a power supply circuit and an electronic device thereof, and more particularly to a power supply circuit having a power supply interface and an electronic device thereof.

Universal Serial Bus (USB) interface has been widely used in mobile phones, digital cameras, tablets, notebook computers and other electronic devices, in which the universal serial bus interface can not only transmit data, but also in recent years. Committed to power transmission. Due to the booming of the universal serial bus interface, many mobile devices currently use the universal serial bus interface to achieve the dual functions of data transmission and power transmission, replacing the old power transmission interface with the universal serial bus interface. Become a trend.

According to the above, the charger and the electronic device may be mixed in the case where the power supply interface is the same. Due to the different design of the power supply circuit, the power supply voltage that different electronic devices can receive may be different. When the electronic device receives a non-corresponding power supply voltage, the electronic device may not operate normally or even malfunction. Therefore, how to avoid the inoperability of the electronic device and the power supply voltage is a development trend of the power circuit for designing the electronic device.

The novel creation provides a power supply circuit and an electronic device thereof, which can avoid excessive damage to the transformer and cause damage to the transformer.

The power circuit of the present invention comprises a power receiving circuit, a control circuit and a power conversion circuit. The power receiving circuit is coupled to a transformer to receive a power voltage and a setting signal through a power interface, and provides an operating voltage and a control reference signal. The control circuit is coupled to the power receiving circuit to receive the control reference signal and provide a power adjustment signal according to the control reference signal. The power conversion circuit is coupled to the power receiving circuit and the control circuit to receive the operating voltage and the power adjustment signal, and convert the operating voltage into a system voltage, wherein the power conversion circuit adjusts a current value of the system voltage according to the power adjustment signal.

The electronic device created by the present invention includes the above-described power supply circuit.

Based on the above, the power circuit and the electronic device thereof are designed, and the control circuit selects an appropriate configuration file as a preset configuration file according to the power value of the setting signal, and adjusts the current value of the system voltage correspondingly. Thereby, it is possible to avoid excessive extraction of the current of the transformer and damage of the transformer.

The above described features and advantages of the present invention will become more apparent and understood from the following description.

1 is a schematic diagram of a system of an electronic device in accordance with an embodiment of the present invention. Referring to FIG. 1 , in the embodiment, the electronic device 100 is coupled to the transformer 10 to receive the power voltage VBUS and the setting signal SCC from the transformer 10 , wherein the transformer 10 has a power transmission circuit 11 to generate and transmit the power voltage VBUS and Set the signal SCC. In this embodiment, the power transmission circuit 11 transmits the power supply voltage VBUS and the setting signal SCC through the power interface, and the power interface is, for example, a Universal Series Bus (USB) C-type interface. When the power interface is a universal serial bus C-type interface, the power transmission circuit 11 transmits the power supply voltage VBUS through the power pin of the universal serial bus interface, and is connected through a configuration channel of the universal serial bus interface. The foot transmits the setting signal SCC.

The electronic device 100 includes a power circuit 110 and a main operating circuit 120. The power supply circuit 110 includes a power receiving circuit 111, a control circuit 113, and a power conversion circuit 115. The power receiving circuit 111 is coupled to the transformer 10 to receive the power voltage VBUS and the setting signal SCC through the power interface. The power receiving circuit 111 supplies the operating voltage VOP to the power converting circuit 115 in accordance with the power source voltage VBUS, and supplies the control reference signal SCR to the control circuit 113 in accordance with the setting signal SCC.

The control circuit 113 is coupled to the power receiving circuit 111 to receive the control reference signal SCR, and provides the power adjustment signal SPR to the power conversion circuit 115 in accordance with the control reference signal SCR. The power conversion circuit 115 is coupled to the power receiving circuit 111 to receive the operating voltage VOP, and is coupled to the control circuit 113 to receive the power adjustment signal SPR. The power conversion circuit 115 converts the operating voltage VOP into the system voltage VDD, and adjusts the current value of the system voltage VDD in accordance with the power adjustment signal SPR.

The main operation circuit 120 includes a system circuit 121 and a battery circuit 123. After receiving the system voltage VDD, the system circuit 121 operates with the system voltage VDD to enable the electronic device 100 to operate normally. The battery circuit 123 charges the battery (not shown) with the system voltage VDD, and continues to supply the power required for the operation of the system circuit 121 after the system voltage VDD has disappeared.

In the present embodiment, the power receiving circuit 111 has a plurality of profiles, and the power receiving circuit 111 generates an operating voltage VOP according to a preset profile in the profile. The configuration file in the power receiving circuit 111 corresponds to a plurality of power values, such as 45 watts, 28.5 watts, 24 watts, 10 watts, 7.5 watts, 5 watts, ..., etc., and the respective profiles correspond to different voltage values and current values. For example, a 45 watt profile is set to 20 volts and 2.25 amps, a 28.5 watt profile is set to 20 volts and 2.25 amps, a 24 watt profile is set to 12 volts and 2 amps, and a 10 watt profile is set. The 5 volt and 2 amp, 7.5 watt profiles are set to 5 volts and 1.5 amps, and the 5 watt profile is set to 5 volts and 1 amp. According to the above, when the configuration file preset by the power receiving circuit 111 corresponds to 45 watts, the operating voltage VOP has a voltage value of 20 volts and a current value of 2.25 amps.

When the power value of the preset profile is the same as the power value of the setting signal SCC, the operations of the power receiving circuit 111, the control circuit 113, and the power conversion circuit 115 remain unchanged. When the power value of the preset profile is different (here, corresponding to 45 watts) to the power value of the set signal (for example, 25 watts), the control circuit 113 selects the corresponding power value in the configuration file according to the power value of the set signal. One of the power values closest to the set signal (here, for example, a configuration file corresponding to 24 watts), and the selected profile is set as a preset profile. At this time, according to the setting of the 24 watt profile, the voltage value of the operating voltage VOP output from the power receiving circuit 111 is changed to 12 volts, and the current value is changed to 2 amps.

On the other hand, since the change of the configuration file causes a change in the voltage value and the current value of the operating voltage VOP, the system voltage VDD is kept constant, so that the system voltage VDD can be used by the system circuit 121 and the battery circuit 123, The control circuit 113 adjusts the current value of the system voltage VDD through the power adjustment signal SPR, that is, the control circuit 113 generates the power adjustment signal SPR according to the selected configuration file.

According to the above, the control circuit 113 selects an appropriate configuration file as a preset configuration file according to the power value of the setting signal SCC, and adjusts the current value of the system voltage VDD correspondingly. Thereby, excessive current extraction of the current of the transformer 10 can be avoided to cause damage to the transformer 10.

2 is a flow chart of a method of operating a power supply circuit in accordance with an embodiment of the present invention. Referring to FIG. 2, in the embodiment, the operation method of the power supply circuit includes the following steps. In step S201, it is determined whether the power receiving circuit is coupled to the transformer. When the power receiving circuit is coupled to the transformer, that is, the determination result is “Yes”, step S203 is performed, when the power receiving circuit is not coupled to the transformer. If the result of the determination is "NO", the process returns to step S201. In step S203, the power receiving circuit provides the operating voltage in a preset profile. In step S205, the control circuit determines whether the power value of the preset configuration file corresponds to the power value of the setting signal. When the power value of the preset configuration file corresponds to the power value of the setting signal, that is, the determination result is “Yes”, then Step S207 is executed. When the power value of the preset configuration file does not correspond to the power value of the setting signal, that is, the determination result is “No”, step S209 is performed.

In step S207, the operation setting of the power receiving circuit and the power converting circuit is maintained. In step S209, the control circuit selects a configuration file according to the power value of the set signal. In step S211, the control circuit sets the current value of the system voltage according to the selected configuration file. In step S213, the control circuit sets the selected profile as a preset profile, and returns to step S205. The order of the steps S201, S203, S205, S207, S209, S211, and S213 is for illustrative purposes, and the embodiment of the present invention is not limited thereto. The details of the steps S201, S203, S205, S207, S209, S211, and S213 can be referred to the embodiment of FIG. 1, and details are not described herein again.

In summary, the power circuit and the electronic device of the novel device, the control circuit selects an appropriate configuration file as a preset configuration file according to the power value of the setting signal, and adjusts the current value of the system voltage correspondingly. Thereby, it is possible to avoid excessive extraction of the current of the transformer and damage of the transformer.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the novel creation, and any person skilled in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

10‧‧‧Transformers
11‧‧‧Power transmission circuit
100‧‧‧Electronic devices
110‧‧‧Power circuit
111‧‧‧Power receiving circuit
113‧‧‧Control circuit
115‧‧‧Power conversion circuit
120‧‧‧Main operating circuit
121‧‧‧System Circuit
123‧‧‧Battery Circuit
SCC‧‧‧Set signal
SCR‧‧‧ control reference signal
SPR‧‧‧Power adjustment signal
VBUS‧‧‧ power supply voltage
VDD‧‧‧ system voltage
VOP‧‧‧ operating voltage
S201, S203, S205, S207, S209, S211, S213‧‧ steps

1 is a schematic diagram of a system of an electronic device in accordance with an embodiment of the present invention. 2 is a flow chart of a method of operating a power supply circuit in accordance with an embodiment of the present invention.

10‧‧‧Transformers

11‧‧‧Power transmission circuit

100‧‧‧Electronic devices

110‧‧‧Power circuit

111‧‧‧Power receiving circuit

113‧‧‧Control circuit

115‧‧‧Power conversion circuit

120‧‧‧Main operating circuit

121‧‧‧System Circuit

123‧‧‧Battery Circuit

SCC‧‧‧Set signal

SCR‧‧‧ control reference signal

SPR‧‧‧Power adjustment signal

VBUS‧‧‧ power supply voltage

VDD‧‧‧ system voltage

VOP‧‧‧ operating voltage

Claims (10)

A power supply circuit includes: a power receiving circuit coupled to a transformer for receiving a power voltage and a setting signal through a power supply interface, and providing an operating voltage and a control reference signal; a control circuit coupled to the power receiving circuit Receiving the control reference signal, and providing a power adjustment signal according to the control reference signal; and a power conversion circuit coupled to the power receiving circuit and the control circuit to receive the operating voltage and the power adjustment signal, and The operating voltage is converted to a system voltage, wherein the power conversion circuit adjusts a current value of the system voltage according to the power adjustment signal. The power supply circuit of claim 1, wherein the power supply interface is a universal serial bus interface, and the power supply voltage is transmitted through a power pin of the universal serial bus interface, and the setting signal is transmitted through the power supply. A configuration pin transfer of the universal serial bus interface. The power supply circuit of claim 1, wherein the power receiving circuit has a plurality of configuration files, and the operating voltage is generated according to a preset configuration file of the configuration files. The power supply circuit of claim 3, wherein the configuration files correspond to a plurality of power values, and when the power value of the preset configuration file is different from the power value of the setting signal, the control circuit is based on The power value of the setting signal selects one of the configuration files, generates the power adjustment signal according to the selected configuration file, and sets the selected configuration file as the preset configuration file. The power supply circuit of claim 4, wherein when the power value of the preset configuration file is different from the power value of the setting signal, the control circuit selects a corresponding power value in the configuration files to be close to the power value. Set one of the power values of the signal. An electronic device includes: a power receiving circuit coupled to a transformer for receiving a power supply voltage and a setting signal through a power supply interface, and providing an operating voltage and a control reference signal; a control circuit coupled to the power receiving circuit Receiving the control reference signal, and providing a power adjustment signal according to the control reference signal; and a power conversion circuit coupled to the power receiving circuit and the control circuit to receive the operating voltage and the power adjustment signal, and The operating voltage is converted to a system voltage, wherein the power conversion circuit adjusts a current value of the system voltage according to the power adjustment signal. The electronic device of claim 6, wherein the power interface is a universal serial bus interface, the power voltage is transmitted through a power pin of the universal serial bus interface, and the setting signal is transmitted through the A configuration pin transfer of the universal serial bus interface. The electronic device of claim 6, wherein the power receiving circuit has a plurality of configuration files, and the operating voltage is generated according to a preset configuration file of the configuration files. The electronic device of claim 8, wherein the configuration files correspond to a plurality of power values, and when the power value of the preset configuration file is different from the power value of the setting signal, the control circuit is based on The power value of the setting signal selects one of the configuration files, generates the power adjustment signal according to the selected configuration file, and sets the selected configuration file as the preset configuration file. The electronic device of claim 9, wherein when the power value of the preset profile is different from the power value of the setting signal, the control circuit selects a corresponding power value in the configuration file to be close to the power value. Set one of the power values of the signal.