Power supply control circuit and access point apparatus

Abstract

A power control circuit and an access point apparatus are provided in the present disclosure. The power control circuit includes an output terminal, a first connection port, a first switch, a second connection port, a first sensing circuit, and a first priority control circuit. The first port is connected to the output terminal. The second port is connected to the output terminal via the first switch. The first sensing circuit is configured to sense a first voltage from the first connection port and output a first sensing signal. When the first voltage is greater than or equal to a first threshold, the first priority control circuit turns off the first switch. When the first voltage is less than the first threshold, the first priority control circuit turns on the first switch.

Claims

1. A power supply control circuit, comprising: One output terminal; A first connection port, the first connection port being connected to the output terminal; a first switch; A second connection port connected to the output terminal via the first switch; a first sensing circuit configured to sense a first voltage from the first connection port and output a first sensing signal, wherein the first sensing signal is low when the first voltage is greater than or equal to a first threshold, and high when the first voltage is less than the first threshold; and a first priority control circuit configured to receive the first sensing signal output from the first sensing circuit and control the first switch to be off or on, wherein the first priority control circuit turns off the first switch when the first sensing signal is low, and turns on the first switch when the first sensing signal is high, wherein: The first connection port includes a positive terminal and a negative terminal, the output terminal is connected between the positive terminal and the negative terminal of the first connection port, and the negative terminal of the first connection port is grounded; and the second connection port includes a positive terminal and a negative terminal, the positive terminal of the second connection port is connected to the positive terminal of the first connection port, and the negative terminal of the second connection port is connected to the negative terminal of the first connection port via the first switch.

2. The power control circuit as described in claim 1, wherein the first connection port is configured to receive a transformer (Adapter) connector.

3. The power control circuit as described in claim 1, wherein the second connection port is configured to receive an Ethernet connector.

4. The power control circuit as described in claim 1, wherein the output terminal is connected to a voltage regulator circuit.

5. The power control circuit as described in claim 4, wherein the voltage regulator circuit is a pulse width modulation (PWM) circuit.

6. The power control circuit as described in claim 4, wherein: The voltage regulator circuit is configured to receive an input voltage from the first connection port or the second connection port via the output terminal and output an output voltage; the output voltage is not interrupted when switching from receiving the input voltage from the first connection port to receiving the input voltage from the second connection port; and the output voltage is not interrupted when switching from receiving the input voltage from the second connection port to receiving the input voltage from the first connection port.

7. The power control circuit as described in claim 1, wherein the first switch is an N-type metal-oxide-semiconductor field-effect transistor (NMOS).

8. The power control circuit as claimed in claim 1 further includes a second switch and a third connection port, the third connection port being connected to the output terminal via the second switch.

9. The power control circuit as described in claim 8, further comprising: A second sensing circuit configured to sense a second voltage from the second connection port and output a second sensing signal, wherein the second sensing signal is low when the second voltage is greater than or equal to a second threshold, and is high when the second voltage is less than the second threshold; and a second priority control circuit configured to receive the second sensing signal output from the second sensing circuit and control the second switch to be turned off or on, wherein the second priority control circuit turns off the second switch when the second sensing signal is low.

10. The power control circuit as claimed in claim 9, wherein the second priority control circuit also receives the first sensing signal output from the first sensing circuit, and when either or both of the first sensing signal and the second sensing signal are at a low potential, the second priority control circuit turns off the second switch, and when both the first sensing signal and the second sensing signal are at a high potential, the second priority control circuit turns on the second switch.

11. The power control circuit as claimed in claim 1, wherein the first sensing circuit includes a sensing circuit chip and a first sensing circuit switch, the sensing circuit chip being configured to control the first sensing circuit switch to be turned off or on, wherein: When the first voltage is greater than or equal to the first threshold, the sensing circuit chip turns on the first sensing circuit switch, and the first sensing circuit switch turns on, causing the first sensing signal to be at a low potential; and when the first voltage is less than the first threshold, the sensing circuit chip turns off the first sensing circuit switch, and the first sensing circuit switch turns off, causing the first sensing signal to be at a high potential.

12. The power control circuit as claimed in claim 11, wherein the first sensing circuit further includes a second sensing circuit switch, wherein: When the first voltage is greater than or equal to the first threshold, the sensing circuit chip turns on the second sensing circuit switch, which in turn turns on the first sensing circuit switch, and the first sensing circuit switch turns on, resulting in a low potential for the first sensing signal; and when the first voltage is less than the first threshold, the sensing circuit chip turns off the second sensing circuit switch, which in turn turns on the first sensing circuit switch, and the first sensing circuit switch turns off, resulting in a high potential for the first sensing signal.

13. The power control circuit as claimed in claim 12, wherein the first sensing circuit switch is an NMOS and the second sensing circuit switch is a PNP type bipolar transistor (BJT).

14. The power control circuit as claimed in claim 1, wherein the first priority control circuit includes a first priority control switch and a second priority control switch, wherein: The low potential of the first sensing signal causes the first priority control switch to turn on, the turning on of the first priority control switch causes the second priority control switch to turn on, and the turning on of the second priority control switch causes the first switch to turn off; and the high potential of the first sensing signal causes the first priority control switch to turn off, the turning off of the first priority control switch causes the second priority control switch to turn off, and the turning off of the second priority control switch causes the first switch to turn on.

15. The power control circuit as claimed in claim 14, wherein the first priority control switch is a PNP type BJT and the second priority control switch is an NMOS.

16. The power control circuit as claimed in claim 1, wherein the turning off or on of the first switch does not affect the operation of the first sensing circuit in performing the sensing.

17. An access point (AP) device, comprising: One AP circuit system; A pulse width modulation (PWM) circuit configured to directly or indirectly power the AP circuit system; an output terminal; a first connection port connected to the PWM circuit via the output terminal; a first switch; and a second connection port connected to the PWM circuit via the first switch and the output terminal. A first sensing circuit configured to sense a first voltage from the first connection port and output a first sensing signal, wherein the first sensing signal is low when the first voltage is greater than or equal to a first threshold, and high when the first voltage is less than the first threshold; and a first priority control circuit configured to receive the first sensing signal output from the first sensing circuit and control the first switch to be off or on, wherein the first priority control circuit turns off the first switch when the first sensing signal is low, and turns on the first switch when the first sensing signal is high, wherein: The first connection port includes a positive terminal and a negative terminal, the output terminal is connected between the positive terminal and the negative terminal of the first connection port, and the negative terminal of the first connection port is grounded; and the second connection port includes a positive terminal and a negative terminal, the positive terminal of the second connection port is connected to the positive terminal of the first connection port, and the negative terminal of the second connection port is connected to the negative terminal of the first connection port via the first switch.

18. The AP device as claimed in claim 17, wherein the first port is configured to receive an adapter connector and the second port is configured to receive an Ethernet connector.

19. The AP device as claimed in claim 17, wherein the PWM circuit is configured to receive an input voltage from the first connection port or the second connection port and output an output voltage to power the AP circuit system, wherein the output voltage is not interrupted when switching from receiving the input voltage from the first connection port to receiving the input voltage from the second connection port, and the output voltage is not interrupted when switching from receiving the input voltage from the second connection port to receiving the input voltage from the first connection port.

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