CN-224218139-U - Switch power supply circuit with switching function

CN224218139UCN 224218139 UCN224218139 UCN 224218139UCN-224218139-U

Abstract

The application discloses a switch power supply circuit with a switching function, which comprises a PD power supply module, a direct current adapter power supply module and a PD chip, wherein the voltage output end of the PD power supply module is connected to a power input pin of the PD chip, the PD power supply module is connected with the power input pin of the switch in parallel, the voltage output end of the PD power supply module is simultaneously connected to a voltage detection pin of the PD chip, the PD chip is used for cutting off the connection between the power input pin and the power output pin when the voltage detection pin detects a high level so that the direct current adapter power supply module supplies power to the switch, and the PD chip is also used for controlling the power input pin and the power output pin to be conducted when the voltage detection pin detects a low level so that the PD power supply module supplies power to the switch. The application can solve the problems of limited application scenes and application range of the switch in the related technology through the scheme.

Inventors

LIU JIANG
HUANG BIN
HUANG YIXING

Assignees

广东优力普物联科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250121

Claims (8)

1. The utility model provides a take switch power supply circuit of switching function which characterized in that includes PD power module, direct current adapter power module and PD chip, wherein: The voltage output end of the PD power supply module is connected to the power input pin of the PD chip; The power supply input terminal is connected with the power supply output pin of the PD chip in parallel and then connected to the power supply input of the exchanger; The voltage output end of the direct current adapter power supply module is simultaneously connected with the voltage detection pin of the PD chip; The PD chip is used for cutting off the connection between a power input pin and the power output pin when the voltage detection pin detects a high level, so that the direct current adapter power supply module supplies power for the switch; The PD chip is also used for controlling the power input pin and the power output pin to be conducted when the voltage detection pin detects a low level, so that the PD power supply module supplies power to the switch; The PD power supply module comprises a POE power supply, a network transformer, a first rectifying bridge and a second rectifying bridge, wherein the output of the POE power supply is connected to the alternating current input ends of the first rectifying bridge and the second rectifying bridge respectively after passing through the network transformer, the positive output ends of the first rectifying bridge and the second rectifying bridge are commonly connected to the power input pin of the PD chip, and the negative output ends of the first rectifying bridge and the second rectifying bridge are grounded; The direct current adapter power supply module comprises an adapter direct current power supply, the positive electrode of the adapter direct current power supply is connected to the power supply input of the switch through a rectifier diode, the negative electrode of the adapter direct current power supply is grounded, and the voltage detection pin of the PD chip is connected between the positive electrode of the adapter direct current power supply and the positive electrode of the rectifier diode.
2. The switch over function power supply circuit of claim 1, wherein the PD power supply module further comprises a common mode inductance; The positive output ends of the first rectifier bridge and the second rectifier bridge are commonly connected to the first end of a first coil of the common mode inductor, and the second end of the first coil is connected to a power input pin of the PD chip; The negative output ends of the first rectifier bridge and the second rectifier bridge are commonly connected to the first end of a second coil of the common mode inductor, and the second end of the second coil is grounded.
3. The switch power supply circuit with switching function according to claim 2, wherein the PD power supply module further comprises a lightning protection diode, an anode of the lightning protection diode is grounded, and a cathode of the lightning protection diode is connected between the second end of the first coil and a power input pin of the PD chip.
4. The switch power supply circuit with switching function according to claim 2, wherein the PD power supply module further comprises a PD filter capacitor, one end of the PD filter capacitor is connected between the second end of the first coil and the power input pin of the PD chip, and the other end is grounded.
5. The switch over function power supply circuit of claim 1, wherein the dc adapter power module further comprises a thermistor connected in series between the positive pole of the adapter dc power supply and the positive pole of the rectifier diode.
6. The switch power supply circuit with switching function according to claim 1, wherein the dc adapter power supply module further comprises at least one adapter filter capacitor, one end of the adapter filter capacitor is connected between the positive electrode of the adapter dc power supply and the positive electrode of the rectifier diode, and the other end is grounded.
7. The switch power supply circuit with switching function according to claim 1, further comprising a switch filter capacitor, wherein one end of the switch filter capacitor is connected between a power output pin of the PD chip and a power supply input of the switch, and the other end is grounded.
8. The switch power supply circuit with the switching function according to claim 7, further comprising a first magnetic bead and a second magnetic bead, wherein the voltage output end of the direct current adapter power supply module is connected with the power output pin of the PD chip in parallel, then connected to the switch power supply input through the first magnetic bead, and the switch filter capacitor is connected with the ground, and then connected in series back to the negative electrode of the adapter direct current power supply through the second magnetic bead.

Description

Switch power supply circuit with switching function Technical Field The application relates to the technical field of switch power supply technology, in particular to a switch power supply circuit with a switching function. Background At present, the main current of the power supply mode of the switch is mainly divided into two types, the first type is to supply power by using an AC power supply, after AC voltage is input, the AC voltage and current are converted into DC by using a power supply in the switch, then the switch is supplied with power, the second type is to supply power by using an adapter, and the second type is to supply power to the adapter, which is also one type of input AC power supply, but the power supply is provided with a shell outside a shell, and is converted into DC by the adapter after AC voltage and current are input, and then the DC terminal is connected to an interface of the switch, so that the power supply of the switch is realized. However, both the above power supply modes have respective limitations, for example, when an AC outlet in a machine room is full, a switch using the first power supply mode cannot be used, and when the machine room is not suitable for supplying power to an adapter, a switch using the second power supply mode cannot be used, which results in limited application scenarios and application ranges of the switch. Disclosure of utility model The application provides a switch power supply circuit with a switching function, which can solve the problems of limited application scenes and application range of a switch in the related technology. The embodiment of the application provides a switch power supply circuit with a switching function, which comprises a PD power supply module, a DC adapter power supply module and a PD chip, wherein: The voltage output end of the PD power supply module is connected to the power input pin of the PD chip; The voltage output end of the direct current adapter power supply module is connected with the power output pin of the PD chip in parallel and then connected to the power supply input of the exchanger; The voltage output end of the direct current adapter power supply module is simultaneously connected with the voltage detection pin of the PD chip; The PD chip is used for cutting off the connection between a power input pin and the power output pin when the voltage detection pin detects a high level, so that the direct current adapter power supply module supplies power for the switch; And the PD chip is also used for controlling the power input pin and the power output pin to be conducted when the voltage detection pin detects a low level, so that the PD power supply module supplies power to the switch. In some embodiments, the PD power supply module includes a POE power supply, a network transformer, a first rectifying bridge and a second rectifying bridge, the output of the POE power supply is connected to the ac input terminals of the first rectifying bridge and the second rectifying bridge after passing through the network transformer, the positive output terminals of the first rectifying bridge and the second rectifying bridge are commonly connected to the power input pin of the PD chip, and the negative output terminals of the first rectifying bridge and the second rectifying bridge are grounded. In some embodiments, the PD power module further comprises a common mode inductance; The positive output ends of the first rectifier bridge and the second rectifier bridge are commonly connected to the first end of a first coil of the common mode inductor, and the second end of the first coil is connected to a power input pin of the PD chip; The negative output ends of the first rectifier bridge and the second rectifier bridge are commonly connected to the first end of a second coil of the common mode inductor, and the second end of the second coil is grounded. In some embodiments, the PD power module further includes a lightning protection diode having an anode grounded and a cathode connected between the second end of the first coil and a power input pin of the PD chip. In some embodiments, the PD power module further includes a PD filter capacitor, one end of the PD filter capacitor is connected between the second end of the first coil and the power input pin of the PD chip, and the other end is grounded. In some embodiments, the dc adapter power module includes an adapter dc power source, an anode of the adapter dc power source is connected to a power input of the switch through a rectifier diode, a cathode of the adapter dc power source is grounded, and a voltage detection pin of the PD chip is connected between the anode of the adapter dc power source and an anode of the rectifier diode. In some embodiments, the dc adapter power module further comprises a thermistor connected in series between the positive pole of the adapter dc power source and the positive pole of the rectifier diode. In some embodiments, the dc ada