Detection circuit and detecting method thereof
First Claim
1. A detection circuit for detecting a state of connection between a first signal port of an electronic device and a first external device, the detection circuit comprising:
- a signal generator, a switch module, a signal coupling circuit, a signal detector and a processing unit,wherein the signal generator, the switch module, the signal detector and the first signal port are electrically connected with the processing unit, the signal generator is electrically connected directly with the switch module, the switch module is electrically connected with the signal coupling circuit, the signal coupling circuit comprises a first coupler and a second coupler that has three connection ends, and is electrically connected directly with both the first signal port and the signal detector through a first connection end and a second connection end of the second coupler, and the signal coupling circuit and the signal detector are electrically connected in series between the first signal port and the processing unit; and
wherein;
upon receiving a start signal by the processing unit, the processing unit sends an enable signal to the signal generator and a control signal to the switch module,upon receiving the enable signal, the signal generator is enabled and sends a test signal to the switch module,upon receiving the control signal, the switch module is turned on to receive the test signal from the signal generator, and sends the received test signal to the signal coupling circuit through the first coupler, and the signal coupling circuit then sends the test signal from a third connection end of the second coupler to the first signal port,upon receiving the test signal from the signal coupling circuit, the first signal port generates a reflect signal according to the received test signal, and sends the reflect signal through the signal coupling circuit to the signal detector,upon receiving the reflect signal, the signal detector generates a detection signal and sends the detection signal to the processing unit, andupon receiving the detection signal, the processing unit determines the state of connection between the first signal port of the electronic device and the first external device by comparing the detection signal with a predetermined threshold value.
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Accused Products
Abstract
A detection circuit is used to detect a connection state between a first signal port of an electronic device and a first external device. The detection circuit includes a signal generator, a switch module, a signal detector, and a processing unit. The signal generator generates a test signal. During a test process, the signal generator is electrically connected to the first signal port by the switch module, such that the test signal is sent to the first signal port to test the connection state of the first signal port. The signal detector produces a detection signal according to the connection state of the first signal port. The processing unit determines the state of connection between the first signal port and the first external device by comparing the voltage of the detection signal with a threshold value.
8 Citations
20 Claims
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1. A detection circuit for detecting a state of connection between a first signal port of an electronic device and a first external device, the detection circuit comprising:
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a signal generator, a switch module, a signal coupling circuit, a signal detector and a processing unit, wherein the signal generator, the switch module, the signal detector and the first signal port are electrically connected with the processing unit, the signal generator is electrically connected directly with the switch module, the switch module is electrically connected with the signal coupling circuit, the signal coupling circuit comprises a first coupler and a second coupler that has three connection ends, and is electrically connected directly with both the first signal port and the signal detector through a first connection end and a second connection end of the second coupler, and the signal coupling circuit and the signal detector are electrically connected in series between the first signal port and the processing unit; and wherein; upon receiving a start signal by the processing unit, the processing unit sends an enable signal to the signal generator and a control signal to the switch module, upon receiving the enable signal, the signal generator is enabled and sends a test signal to the switch module, upon receiving the control signal, the switch module is turned on to receive the test signal from the signal generator, and sends the received test signal to the signal coupling circuit through the first coupler, and the signal coupling circuit then sends the test signal from a third connection end of the second coupler to the first signal port, upon receiving the test signal from the signal coupling circuit, the first signal port generates a reflect signal according to the received test signal, and sends the reflect signal through the signal coupling circuit to the signal detector, upon receiving the reflect signal, the signal detector generates a detection signal and sends the detection signal to the processing unit, and upon receiving the detection signal, the processing unit determines the state of connection between the first signal port of the electronic device and the first external device by comparing the detection signal with a predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A detecting method for detecting a state of connection between a first signal port in an electronic device and a first external device, the detection circuit comprising a signal generator, a switch module, a signal coupling circuit, a signal detector and a processing unit, wherein the signal generator is electrically connected directly with the switch module, the signal coupling circuit comprises a first coupler and a second coupler that has three connection ends and is electrically connected directly with both the first signal port and the signal detector through a first connection end and a second connection end of the second coupler, and the signal coupling circuit and the signal detector are electrically connected in series between the first signal port and the processing unit, and the detecting method comprising the steps of:
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generating, by the signal generator, a test signal; sending the test signal, by the signal generator and via the switch module and through the first coupler of the signal coupling circuit, to the first signal port from a third connection end of the second coupler and test the state of connection of the first signal port in a test process; producing a detection signal, by the signal detector, according to the state of connection of the first signal port; and determining, by the processing unit, the state of connection between the first signal port and the first external device according to a result of comparison between a voltage of the detection signal and a threshold value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification