A power supply circuit for wireless access equipment

Abstract

The present invention discloses a power supply circuit for wireless access equipment, including a charging input circuit J4, a fuse F1, a resistor R39, a resistor R41, a diode T1, a diode T2, a diode T3, a power supply circuit U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4, wherein the port VBUS2 of the charging input circuit J4 is connected to the diode T3, the capacitor C55, the resistor R39, the pin 8 of the chip U3 and the pin 4 of the chip U3 through the fuse F1, the other end of the resistor R39 is connected to the interface USB DET, the resistor R40 and the capacitor C8, and the other end of the capacitor C8 is connected to the other end of the resistor R40 and the ground. The power supply circuit of the present invention has fewer circuit components, is divided into multiple power supplies, can stably supply power to the remaining modules, and has functions such as charging temperature detection.

Description

Technical Field

[0001] The invention relates to the technical field of power supply, in particular to a power supply circuit for wireless access equipment. Background Art

[0002] The known existing power supply circuit of the visual blackhead remover has the problem of overly complex design, large board space occupation and high production cost. Figure 1 The circuit of the existing visual blackhead remover power supply circuit module uses the U4 / LDO3.3V voltage regulator circuit to supply +3.3V to the main control circuit module, and uses the U6 / LDO2.8V voltage regulator circuit to supply +2.8V to the camera circuit module. Summary of the invention

[0003] The object of the present invention is to provide a power supply circuit for wireless access equipment to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A power supply circuit for a wireless access device includes a charging input circuit J4, a fuse F1, a resistor R39, a resistor R41, a diode T1, a diode T2, a diode T3, a power supply circuit U3, a DC-DC boost chip U5, and a voltage stabilizing circuit U4. The port VBUS2 of the charging input circuit J4 is connected to the diode T3, the capacitor C55, the resistor R39, the pin 8 of the chip U3, and the pin 4 of the chip U3 through the fuse F1. The other end of the resistor R39 is connected to the interface USBDET, the resistor R40, and the capacitor C8. The other end of the capacitor C8 is connected to the other end of the resistor R40 and the ground. The other end of the diode T1 is connected to the ground. Pin 5 of chip U3 is connected to capacitor C11, capacitor C69, pin 5 of DC-DC boost chip U5, pin 1 of voltage stabilizing circuit U4 and the positive electrode of battery BT1. The negative electrode of battery BT1 is connected to the other end of capacitor C69, the other end of capacitor C11 and ground. Pin 3 of voltage stabilizing circuit U4 is connected to resistor R26, resistor R27 and resistor R28. The other end of resistor R27 is connected to switch K2 and resistor R30. The other end of switch K2 is connected to battery power supply terminal VBAT. Resistor R41 is connected to charging input circuit J4.

[0006] As a further technical solution of the present invention: the output voltage of the DC-DC boost chip U5 is 5.0V.

[0007] As a further technical solution of the present invention: the output voltage of the voltage stabilizing circuit U4 is 3.0V.

[0008] As a further technical solution of the present invention: the output voltage of the lithium battery BT1 is 3.7V.

[0009] As a further technical solution of the present invention: the input voltage of the charging input circuit J4 is 5V, and it is connected to a 5V power supply USB_IN.

[0010] As a further technical solution of the present invention: the diode T1, the diode T2 and the diode T3 are all TVS diodes.

[0011] As a further technical solution of the present invention: the voltage stabilizing circuit U4 is connected to a control switch K2.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the power supply circuit of the present invention has fewer circuit components, is divided into multiple power supply channels, can stably supply power to the remaining modules, and has functions such as charging temperature detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of the prior art

[0014] Figure 2 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Example 1: Please refer to Figure 2A power supply circuit for a wireless access device includes a charging input circuit J4, a fuse F1, a resistor R39, a resistor R41, a diode T1, a diode T2, a diode T3, a power supply circuit U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4. The port VBUS2 of the charging input circuit J4 is connected to the diode T3, the capacitor C55, the resistor R39, the pin 8 of the chip U3 and the pin 4 of the chip U3 through the fuse F1. The other end of the resistor R39 is connected to the interface USBDET, the resistor R40 and the capacitor C8. The other end of the capacitor C8 is connected to the other end of the resistor R40 and the ground. The other end of the diode T1 is connected to the ground. Pin 5 of chip U3 is connected to capacitor C11, capacitor C69, pin 5 of DC-DC boost chip U5, pin 1 of voltage stabilizing circuit U4 and the positive electrode of battery BT1. The negative electrode of battery BT1 is connected to the other end of capacitor C69, the other end of capacitor C11 and ground. Pin 3 of voltage stabilizing circuit U4 is connected to resistor R26, resistor R27 and resistor R28. The other end of resistor R27 is connected to switch K2 and resistor R30. The other end of switch K2 is connected to battery power supply terminal VBAT. Resistor R41 is connected to charging input circuit J4.

[0017] The charging input circuit J4 introduces a 5V power supply USB_IN from the port through the USBTYPEC line, and after conversion by the charging management circuit U3, outputs a charging power supply VBAT to charge the 3.7V lithium battery BT1. The input terminal of the DC-DC boost circuit U5 is connected to the battery VBAT, and after being boosted to +5V by the boost circuit composed of chip U5, inductor L4, and diode D10, it is output to the air pump circuit module to power the air pump circuit module. The chip U4 with EN control function and the LDO3.0V voltage regulator circuit composed of the peripheral capacitor are used to output +3.0V to power the main control circuit module, and at the same time, a +3.0V is divided to power the camera circuit module. When switch K2 is pressed, the EN pin of the LDO3.0V voltage regulator circuit U4 is high level, starting U4 to output +3.0V, and supplying power to the main control circuit module and the camera circuit module at the same time. At this time, the signal line ON / OFF_KEY is also high level, and this signal is transmitted to the main control circuit module, notifying the main control circuit module to continuously output a high level signal SFGAT, maintaining the continuous start of the LDO3.0V voltage regulator circuit U4, outputting +3.0V, and continuously supplying power to the main control circuit module and the camera circuit module. When switch K2 is pressed again, the main control circuit module detects through the signal line ON / OFF_KEY that if the switch is pressed for the fifth time, the main control circuit module cancels the high level of the control signal SFGAT and changes it to a low level, making the EN pin of the LDO3.0V voltage regulator circuit U4 low level, shutting off the +3.0V output of U4, and the system circuit is in the shutdown state. Specifically, when the switch K2 is pressed for the first time, it turns on the machine; when it is pressed for the second time, the air pump outputs at the first gear; when it is pressed for the third time, the air pump outputs at the second gear; when it is pressed for the fourth time, the air pump outputs at the third gear; when it is pressed for the fifth time, it turns off the machine, and the cycle continues.

[0018] Example 2: Based on Example 1: The output voltage of the DC-DC boost chip U5 is 5.0V. The output voltage of the voltage regulator circuit U4 is 3.0V. The output voltage of the lithium battery BT1 is 3.7V. The input voltage of the charging input circuit J4 is 5V, which is connected to the 5V power supply USB_IN. The diode T1, the diode T2 and the diode T3 are all TVS diodes. The voltage regulator circuit U4 is connected to a control switch K2.

[0019] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0020] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A power supply circuit for a wireless access device, comprising a charging input circuit J4, a fuse F1, a resistor R39, a resistor R41, a diode T1, a diode T2, a diode T3, a power supply circuit U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4, characterized in that: The port VBUS2 of the charging input circuit J4 is connected to the diode T3, the capacitor C55, the resistor R39, the pin 8 of the chip U3 and the pin 4 of the chip U3 through the fuse F1, and the other end of the resistor R39 is connected to the interface USB DET, resistor R40 and capacitor C8, the other end of capacitor C8 is connected to the other end of resistor R40 and ground, the other end of diode T1 is connected to the other end of diode T2, the other end of diode T3, the other end of capacitor C55 and ground, pin 5 of chip U3 is connected to capacitor C11, capacitor C69, pin 5 of DC-DC boost chip U5, pin 1 of voltage stabilizing circuit U4 and the positive electrode of battery BT1, the negative electrode of battery BT1 is connected to the other end of capacitor C69, the other end of capacitor C11 and ground, pin 3 of voltage stabilizing circuit U4 is connected to resistor R26, resistor R27 and resistor R28, the other end of resistor R27 is connected to switch K2 and resistor R30, the other end of switch K2 is connected to battery power supply terminal VBAT, resistor R41 is connected to charging input circuit J4, charging input circuit J4, through USB TYPE C line, a 5V power supply USB_IN is introduced from this port, and after conversion by the charging management circuit U3, a charging power supply VBAT is output to charge the 3.7V lithium battery BT1. The input end of the DC-DC boost circuit U5 is connected to the battery VBAT. After being boosted to +5V by the boost circuit composed of the DC-DC boost chip U5, the inductor L4, and the diode D10, it is output to the air pump circuit module to power the air pump circuit module. The chip U4 with EN control function and the LDO3.0V voltage regulator circuit composed of the peripheral capacitor are used to output +3.0V to power the main control circuit module, and at the same time, a +3.0V is divided to power the camera circuit module. When the switch K2 is pressed, the EN pin of the LDO 3.0V voltage regulator circuit U4 is high, and U4 is started to output +3.0V, and power the main control circuit module and the camera circuit module at the same time. At this time, the signal line ON / OFF_KEY is also high. This signal is transmitted to the main control circuit module, notifying the main control circuit module to continuously output a high-level signal SFGAT, maintaining the LDO The 3.0V voltage regulator circuit U4 is continuously started and outputs +3.0V to continuously power the main control circuit module and the camera circuit module. When the switch K2 is pressed again, the main control circuit module detects through the signal line ON / OFF_KEY that if the switch is pressed for the fifth time, the main control circuit module cancels the high level of the control signal SFGAT and changes it to a low level, so that the EN pin of the LDO 3.0V voltage regulator circuit U4 is a low level, and the +3.0V output of U4 is turned off. The system circuit is in the shutdown state. Specifically, when the switch K2 is pressed for the first time, it is turned on, the second time it is the first gear output of the air pump, the third time it is the second gear output of the air pump, the fourth time it is the third gear output of the air pump, and the fifth time it is turned off, and the cycle continues.

2. A wireless access device power supply circuit according to claim 1, characterized in that: The output voltage of the DC-DC boost chip U5 is 5.0V.

3. A wireless access device power supply circuit according to claim 1, characterized in that: The output voltage of the voltage stabilizing circuit U4 is 3.0V.

4. The wireless access device power supply circuit according to claim 1, characterized in that: The output voltage of the lithium battery BT1 is 3.7V.

5. The wireless access device power supply circuit according to claim 1, characterized in that: The input voltage of the charging input circuit J4 is 5V, and it is connected to a 5V power supply USB_IN.

6. A wireless access device power supply circuit according to claim 2, characterized in that: The diode T1 , the diode T2 and the diode T3 are all TVS diodes.

7. A wireless access device power supply circuit according to claim 4, characterized in that: The voltage stabilizing circuit U4 is connected to a control switch K2.

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