CN103594873B - plug detection circuit - Google Patents

Abstract

The present invention provides a kind of plug detection circuit, it includes adapter, provides power circuit and the signal trigger element of driving voltage for this adapter, this adapter is for the plug grafting for an external device, described adapter includes shell fragment, described signal trigger element is electrically connected between shell fragment and power circuit, when external device is plugged in adapter, shell fragment is in ground state, and described signal trigger element triggers a control signal to enable power circuit；When external device is not plugged in adapter, shell fragment is in unearthed state, and described signal trigger element triggers a control signal not enable power circuit.Described plug detection circuit can be when being plugged in adapter without external device, and controlling power circuit does not provides driving voltage for adapter, to avoid adapter to consume electric energy when zero load.

Description

plug detection circuit

technical field

The invention relates to an electrical connection detection circuit, in particular to a plug detection circuit which can detect whether a plug is plugged into a connector.

Background technique

Most electronic products are provided with different types of connectors for plugging in peripheral devices. For example, the Universal Serial Bus (Universal Serial Bus) on a laptop Bus, USB) connector is used for inserting a USB plug. However, when the USB connector is not in use (no USB device is plugged in), the power supply circuit inside the electronic product will still supply power to the USB connector. Experiments have shown that when the USB connector is empty, it still consumes about 0.8 watts of power, resulting in energy waste.

Contents of the invention

In view of the above circumstances, it is necessary to provide an energy-saving plug detection circuit.

A plug detection circuit, which includes a connector, a power supply circuit that provides a driving voltage for the connector, and a signal trigger unit, the connector is used for inserting a plug of a peripheral device, the connector includes a shrapnel, the The signal trigger unit is electrically connected between the shrapnel and the power circuit. When the peripheral device is plugged into the connector, the shrapnel is in a grounded state, and the signal trigger unit triggers a control signal to enable the power circuit; when the peripheral device is not When plugged into the connector, the shrapnel is in an ungrounded state, and the signal trigger unit triggers a control signal to disable the power supply circuit.

The above-mentioned plug detection circuit detects whether there is an external device plugged in by setting the elastic piece on the connector and the grounding state of the elastic piece. At the same time, the signal triggering unit of the plug detection circuit is electrically connected to the shrapnel, so as to trigger a control signal to the power circuit when the shrapnel is grounded or not grounded, and then control the power circuit to be enabled or disabled. The plug detection circuit can control the power supply circuit not to provide driving voltage for the connector when no peripheral device is plugged into the connector, so as to prevent the connector from consuming power when it is no-load.

Description of drawings

1 is a perspective view of a connector and a peripheral device of a plug detection circuit according to a preferred embodiment of the present invention;

2 is a perspective view of another perspective view of the perspective view of the connector and peripheral device shown in FIG. 1;

3 is a schematic cross-sectional view of the assembled connector and peripheral device shown in FIG. 1;

FIG. 4 is a circuit diagram of a plug detection circuit according to a preferred embodiment of the present invention.

Description of main component symbols

plug detection circuit 100 Connector 10 metal body 12 to open 122 gap 124 insulation sheet 14 shrapnel 16 free end 162 fixed end 164 ground pin GND power pin VBUS first data terminal D- second data terminal D+ signal trigger unit 30 power pin V ground pin G input pin A output pin Y first inductance L1 Second inductance L2 resistance R power supply VCC power circuit 50 Peripherals 200 metal plug 220

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

Please refer to FIG. 1 and FIG. 4 , the present invention provides a plug detection circuit 100 , which is applied in electronic devices (not shown) such as computer hosts and routers. The plug detection circuit 100 includes a connector 10 , a signal trigger unit 30 and a power circuit 50 , and the connector 10 , the signal trigger unit 30 and the power circuit 50 are electrically connected in turn. The plug detection circuit 100 is used to detect whether there is an external device 200 plugged into the connector 10 , and thereby control whether the power supply circuit 50 provides a driving voltage to the connector 10 .

The connector 10 can be a USB connector, PS2 (Personal System 2) Connectors, etc. In this embodiment, the connector 10 is a USB2.0 connector. Correspondingly, the peripheral device 200 may be a USB device, a PS2 device, and the like. In this embodiment, the peripheral device 200 is a USB2.0 device, which includes a metal plug 220 .

Please refer to FIG. 2 and FIG. 3 together. The connector 10 is disposed on the main board (not shown in the figure) of the electronic device. The connector 10 includes a metal body 12 , an insulating sheet 14 and an elastic sheet 16 . The metal body 12 is electrically connected to the system ground portion (not shown) on the motherboard. The metal body 12 is roughly a rectangular body with two ends open, and an opening 122 is provided at one end for plugging the peripheral device 200 . The insulating sheet 14 is disposed at one end of the metal body 12 opposite to the opening 122 to substantially close the other opening end of the metal body 12 . The elastic piece 16 is made of metal material. In this embodiment, the elastic piece 16 is in an “L” shape and includes a free end 162 and a fixed end 164 substantially vertically connected to the free end 162 . The free end 162 passes through the insulating sheet 14 and is accommodated in the space surrounded by the metal body 12, and is spaced from a top wall of the metal body 12 to form a gap 124. The size of the gap 124 is such that when the external device 200 is inserted and connected When using the device 10, the side wall of the metal plug 220 of the peripheral device 200 is just accommodated in the gap 124, and at the same time resists the free end 162 and the metal body 12, so that the free end 162 passes through the metal plug 220, the metal body 12 Electrically connected to the system ground on the motherboard. The fixing end 164 passes through the insulating sheet 14 and is roughly attached to the insulating sheet 14 to fix the elastic sheet 16 .

Please refer to FIG. 4 again, the connector 10 further includes a power pin VBUS, a ground pin GND, a first data terminal D-, and a second data terminal D+. The power pin VBUS is electrically connected to the power circuit 50 through a first inductor L1 to obtain a driving voltage. The ground pin GND is electrically connected to the system ground portion on the main board through a second inductor L2, and the first data terminal D− and the second data terminal D+ are both electrically connected to the main board (not shown).

The signal trigger unit 30 is used to detect whether there is an external device 200 plugged into the connector 10 , and output a corresponding control signal according to the detection result. In this embodiment, the signal trigger unit 30 is an inverter, which includes a power pin V, a ground pin G, an input pin A and an output pin Y. The power pin V is electrically connected to a power VCC provided on the motherboard, and the ground pin G is grounded. The input pin A is electrically connected to the fixed end 164 of the elastic piece 16 , and is electrically connected to the power supply VCC through a resistor R. In this way, when the free end 162 of the shrapnel 16 is not electrically connected to the system ground part on the motherboard, the input pin A inputs a high-level signal; when the free end 162 of the shrapnel 16 is electrically connected to the system ground part on the motherboard , the input pin A inputs a low-level signal. The output pin Y is electrically connected to the power supply circuit 50, when the input pin A inputs a high-level signal, the output pin Y outputs a low-level control signal; when the input pin A inputs a low-level signal, The output pin Y outputs a high level control signal.

It can be understood that the input pin A can also be electrically connected to the free end 162 of the elastic piece 16 .

The power supply circuit 50 is used to enable after receiving a high-level control signal, so as to provide a driving voltage for the connector 10; at the same time, it is used to disable after receiving a low-level control signal, so as to stop supplying the connector 10 Provide drive voltage.

The working principle of the plug detection circuit 100 is further illustrated below in conjunction with FIGS. The body 12 maintains the gap 124 , so the elastic piece 16 is in an ungrounded state. At this time, the input pin A of the signal trigger unit 30 receives a high-level signal, and the output pin Y outputs a low-level control signal to the power supply circuit 50, so as to control the power supply circuit 50 to be disabled and prohibit the power supply circuit 50 from being a connector. 10 provides driving voltage. In this way, it can effectively prevent the connector 10 from consuming power when it is not loaded.

When the metal plug 220 of the peripheral device 200 is plugged into the connector 10 , the metal plug 220 is accommodated in the gap 124 and simultaneously abuts against the free end 162 and the metal body 12 . In this way, the elastic piece 16 is electrically connected to the system ground portion on the motherboard through the metal plug 220 and the metal body 12 to be in a grounded state. At this time, the input pin A of the signal trigger unit 30 receives a low-level signal, and the output pin Y outputs a high-level control signal to the power supply circuit 50 to control the power supply circuit 50 to enable, thereby providing a driving voltage for the connector 10 . In this way, the peripheral device 200 can establish communication with the main board through the connector 10 .

The plug detection circuit 100 of the present invention detects whether there is an external device 200 plugged in by disposing the elastic piece 16 on the connector 10 and the grounding state of the elastic piece 16 . At the same time, the signal trigger unit 30 of the plug detection circuit 100 is electrically connected to the elastic piece 16, so as to respectively trigger a control signal to the power supply circuit 50 when the elastic piece 16 is in a grounded state or not grounded state, and then control the power supply circuit 50 to enable or disable can. The plug detection circuit 100 can prohibit the power supply circuit 50 from providing a driving voltage to the connector 10 when the no-peripheral device 200 is plugged into the connector 10 , so as to prevent the connector 10 from consuming power when it is no-load.

Claims (10)

1. A plug detection circuit, which includes a connector and a power supply circuit that provides a driving voltage for the connector, the connector is used for plugging a peripheral device, and it is characterized in that: the connector includes a shrapnel, The plug detection circuit also includes a signal trigger unit electrically connected between the shrapnel and the power circuit, the signal trigger unit includes an input pin and an output pin, wherein the input pin is electrically connected to the shrapnel, and at the same time through a resistance Electrically connected to a power supply, the output pin is electrically connected to the power supply circuit, when the peripheral device is plugged into the connector, the shrapnel is in a grounded state, and the signal trigger unit triggers a control signal to enable the power supply circuit; When the peripheral device is not plugged into the connector, the shrapnel is in an ungrounded state, and the signal triggering unit triggers another control signal to disable the power supply circuit. 2. The plug detection circuit according to claim 1, wherein the connector is arranged on the main board of an electronic device, the connector includes a metal body, the metal body is grounded through the main board, and the shrapnel It is arranged on the metal body and forms a gap with the metal body. 3. The plug detection circuit according to claim 2, wherein the metal body is a rectangular body with two ends open, and an opening is provided at one end, and the connector further includes an insulating sheet, and the insulating sheet It is set at one end of the metal body opposite to the opening. 4. The plug detection circuit according to claim 3, characterized in that: the elastic piece includes a free end and a fixed end, the free end is arranged in the metal body, and maintains the gap with a top wall of the metal body , the fixed end passes through the insulating sheet. 5. The plug detection circuit according to claim 4, wherein when the peripheral device is plugged into the connector, the peripheral device is partly accommodated in the gap, and simultaneously resists the free end and the The metal body is such that the free end is grounded through the peripheral device and the metal body. 6 . The plug detection circuit according to claim 1 , wherein the connector includes a power pin, and the power circuit provides a driving voltage for the connector through the power pin. 6 . 7. The plug detection circuit according to claim 1, characterized in that: when the shrapnel is in an ungrounded state, the input pin of the signal trigger unit inputs a high-level signal; when the shrapnel is in a grounded state, the signal triggers The input pin of the unit inputs a low-level signal. 8. The plug detection circuit according to claim 7, characterized in that: when the input pin of the signal trigger unit inputs a high-level signal, the output pin of the signal trigger unit outputs a low-level control signal; When the input pin of the signal trigger unit inputs a low-level signal, the output pin of the signal trigger unit outputs a high-level control signal. 9. The plug detection circuit as claimed in claim 8, wherein the signal trigger unit is an inverter. 10. The plug detection circuit according to claim 8, characterized in that: the power supply circuit is used to enable after receiving a high-level control signal to provide a drive voltage for the connector; After a low-level control signal, it is not enabled, so as to stop supplying the drive voltage to the connector.