Power supply circuit capable of converting single power supply into positive and negative power supplies

Abstract

The utility model relates to a single-power-supply-to-positive-negative-power-supply power supply circuit, and relates to the technical field of power supplies. According to the main technical scheme, the circuit comprises an input power supply filtering module, a first power supply voltage stabilizing chip U1, a second power supply voltage stabilizing chip U2 and an output power supply filtering module, wherein the input end of the first power supply voltage stabilizing chip U1 is connected with the output end of the input power supply filtering module; the input end of the second power supply voltage stabilizing chip U2 is connected with the output end of the input power supply filtering module; the input end of the output power supply filtering module is connected with the output end of the first power supply voltage stabilizing chip U1 and the output end of the second power supply voltage stabilizing chip U2, and the input end of the output power supply filtering module is used for outputting a first output power supply and a second output power supply. The DC 5-24V voltage of the input power supply can be converted into the positive and negative dual power supplies, so that the power supply circuit for converting the single power supply into the positive and negative dual power supplies can adapt to various power supply inputs, and the purpose of improving the universality of the power supply circuit for converting the single power supply into the positive and negative dual power supplies is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a single power supply to positive and negative dual power supply circuit. Background Art

[0002] Portable mixers, portable multi-stage audio equalizers, portable small speakers, etc. all have built-in DC-DC single power supply conversion circuits for positive and negative dual power supply.

[0003] When an external input power source is connected to an existing DC-DC single power supply to convert a positive and negative dual power supply circuit, most circuits can only accept power supplies with voltage values such as 5V, 9V or 12V, resulting in poor versatility. Utility Model Content

[0004] The purpose of the utility model is to provide a single power supply to positive and negative dual power supply circuit, which solves the problem that the existing DC-DC single power supply to positive and negative dual power supply circuit can only be connected to power supplies with voltage values such as 5V, 9V or 12V when connected to an external input power supply, resulting in poor versatility.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A single power supply to positive and negative dual power supply circuit includes an input power supply filter module, a first power supply voltage regulator chip U1, a second power supply voltage regulator chip U2 and an output power supply filter module, wherein the input end of the input power supply filter module is used to be connected to the input power supply; the input end of the first power supply voltage regulator chip U1 is connected to the output end of the input power supply filter module; the input end of the second power supply voltage regulator chip U2 is connected to the output end of the input power supply filter module; the input end of the output power supply filter module is connected to the output end of the first power supply voltage regulator chip U1 and the output end of the second power supply voltage regulator chip U2, and the input end of the output power supply filter module is used to output the first output power and the second output power.

[0007] A further technical solution is that the first power supply voltage stabilizing chip U1 and the second power supply voltage stabilizing chip U2 are both XL1509.

[0008] A further technical solution is: the input power filter module includes a first input power filter unit, a second input power filter unit and a third input power filter unit; the first input power filter unit includes an electrolytic capacitor EC4 and a capacitor C2; the positive pole of the electrolytic capacitor EC4 and one end of the capacitor C2 are both used to connect to the input power; the negative pole of the electrolytic capacitor EC4 and the other end of the capacitor C2 are both grounded; the input end of the second input power filter unit and the input end of the third input power filter unit are both connected to the positive pole of the electrolytic capacitor EC4; the output end of the second input power filter unit is connected to the input end of the first power regulator chip U1; the output end of the third input power filter unit is connected to the input end of the second power regulator chip U2.

[0009] A further technical solution is: the second input power filter unit includes a capacitor C1 and a capacitor C3; one end of the capacitor C1 and one end of the capacitor C3 are both connected to the positive electrode of the electrolytic capacitor EC4; the other end of the capacitor C1, the other end of the capacitor C3, pin 4 of the first power supply voltage regulator chip U1, pin 5 of the first power supply voltage regulator chip U1, pin 6 of the first power supply voltage regulator chip U1, pin 7 of the first power supply voltage regulator chip U1, and pin 8 of the first power supply voltage regulator chip U1 are all grounded; one end of the capacitor C3 is connected to pin 1 of the first power supply voltage regulator chip U1.

[0010] A further technical solution is: the third input power filter unit includes an electrolytic capacitor EC1 and a capacitor C4; the positive electrode of the electrolytic capacitor EC1 and one end of the capacitor C4 are both connected to the positive electrode of the electrolytic capacitor EC4; the negative electrode of the electrolytic capacitor EC1, the other end of the capacitor C4, pin 5 of the second power supply voltage regulator chip U2, pin 6 of the second power supply voltage regulator chip U2, pin 7 of the second power supply voltage regulator chip U2, and pin 8 of the second power supply voltage regulator chip U2 are all connected to pin 4 of the second power supply voltage regulator chip U2; the other end of the capacitor C4 is connected to pin 1 of the second power supply voltage regulator chip U2.

[0011] A further technical solution is: the output power filter module includes a first output power filter unit and a second output power filter unit; the first output power filter unit includes an inductor L1, a diode D1, a diode D2, an electrolytic capacitor EC2, a capacitor C7 and a capacitor C8; one end of the inductor L1 and the cathode of the diode D1 are both connected to pin 2 of the first power regulator chip U1; the anode of the diode D1, one end of the capacitor C7, one end of the capacitor C8, and pin 4 of the first power regulator chip U1 are all connected to the cathode of the electrolytic capacitor EC2; the cathode of the electrolytic capacitor EC2 is connected to the output end of the second output power filter unit, and the cathode of the electrolytic capacitor EC2 is grounded; the other end of the inductor L1, the positive electrode of the electrolytic capacitor EC2, and the other end of the capacitor C7 are all connected to the anode of the diode D2; the cathode of the diode D2 is connected to the other end of the capacitor C8, and the cathode of the diode D2 is used to output the first output power 12V+.

[0012] A further technical solution is: the output power filter module also includes a first sampling unit; the first sampling unit includes a capacitor C5, a resistor R1 and a resistor R2; one end of the capacitor C5, one end of the resistor R1, and one end of the resistor R2 are all connected to pin 3 of the first power supply voltage regulator chip U1; the other end of the capacitor C5 and the other end of the resistor R2 are both connected to the positive electrode of the diode D2; the other end of the resistor R1 is grounded.

[0013] A further technical solution is: the second output power filter unit includes an inductor L2, a diode D3, a diode D4, an electrolytic capacitor C3, a capacitor C9 and a capacitor C10; one end of the inductor L2 and one end of the diode D3 are both connected to pin 2 of the second power supply voltage regulator chip U2; the positive electrode of the diode D3, one end of the capacitor C9, the negative electrode of the diode D4, and pin 4 of the second power supply voltage regulator chip U2 are all connected to the negative electrode of the electrolytic capacitor EC3; the other end of the inductor L2, the other end of the capacitor C9, and one end of the capacitor C10 are all connected to the positive electrode of the electrolytic capacitor EC3; the positive electrode of the electrolytic capacitor EC3 is connected to the negative electrode of the electrolytic capacitor EC2; the other end of the capacitor C10 is connected to the positive electrode of the diode D4; the positive electrode of the diode D4 is used to output the second output power 12V-.

[0014] A further technical solution is: the output power filter module also includes a second sampling unit; the second sampling unit includes a capacitor C6, a resistor R3 and a resistor R4; one end of the capacitor C6, one end of the resistor R3, and one end of the resistor R4 are all connected to pin 3 of the second power supply voltage regulator chip U2; the other end of the capacitor C6 and the other end of the resistor R3 are both connected to the positive electrode of the electrolytic capacitor EC3; the other end of the resistor R3 is connected to the negative electrode of the diode D4.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By adjusting the duty cycle of the internal output pulses of the first power supply voltage regulator chip U1 and the second power supply voltage regulator chip U2, the DC5--24V voltage of the input power supply can be converted into a positive and negative dual power supply, so that the single power supply to positive and negative dual power supply circuit can be adapted to a variety of power supply inputs, thereby improving the versatility of the single power supply to positive and negative dual power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an electrical block diagram of a single power supply to positive and negative dual power supply circuit in this embodiment;

[0018] Figure 2 This is a circuit structure topology diagram of a single power supply to positive and negative dual power supply circuit in this embodiment;

[0019] Figure 3 Schematic diagram of the basic principle of a single power supply to positive and negative dual power supply circuit in this embodiment.

[0020] Markings and corresponding parts names in the accompanying drawings:

[0021] 100-input power filter module; 200-output power filter module. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Example

[0024] This embodiment provides a single power supply to positive and negative dual power supply circuit. Figure 1 As shown, it includes an input power filter module 100, a first power voltage regulator chip U1, a second power voltage regulator chip U2 and an output power filter module 200, the input end of the input power filter module 100 is used to connect to the input power; the input end of the first power voltage regulator chip U1 is connected to the output end of the input power filter module 100; the input end of the second power voltage regulator chip U2 is connected to the output end of the input power filter module 100; the input end of the output power filter module 200 is connected to the output end of the first power voltage regulator chip U1 and the output end of the second power voltage regulator chip U2, and the input end of the output power filter module 200 is used to output the first output power and the second output power.

[0025] like Figure 2 As shown, in this embodiment, the first power supply voltage regulator chip U1 and the second power supply voltage regulator chip U2 are both XL1509.

[0026] like Figure 2 As shown, in this embodiment, the input power filter module 100 includes a first input power filter unit, a second input power filter unit and a third input power filter unit; the first input power filter unit includes an electrolytic capacitor EC4 and a capacitor C2; the positive electrode of the electrolytic capacitor EC4 and one end of the capacitor C2 are both used to connect to the input power; the negative electrode of the electrolytic capacitor EC4 and the other end of the capacitor C2 are both grounded; the input end of the second input power filter unit and the input end of the third input power filter unit are both connected to the positive electrode of the electrolytic capacitor EC4; the output end of the second input power filter unit is connected to the input end of the first power regulator chip U1; the output end of the third input power filter unit is connected to the input end of the second power regulator chip U2.

[0027] like Figure 2 As shown, in this embodiment, the second input power filter unit includes a capacitor C1 and a capacitor C3; one end of the capacitor C1 and one end of the capacitor C3 are both connected to the positive electrode of the electrolytic capacitor EC4; the other end of the capacitor C1, the other end of the capacitor C3, pin 4 of the first power supply voltage regulator chip U1, pin 5 of the first power supply voltage regulator chip U1, pin 6 of the first power supply voltage regulator chip U1, pin 7 of the first power supply voltage regulator chip U1, and pin 8 of the first power supply voltage regulator chip U1 are all grounded; one end of the capacitor C3 is connected to pin 1 of the first power supply voltage regulator chip U1.

[0028] like Figure 2 As shown, in this embodiment, the third input power filter unit includes an electrolytic capacitor EC1 and a capacitor C4; the positive electrode of the electrolytic capacitor EC1 and one end of the capacitor C4 are both connected to the positive electrode of the electrolytic capacitor EC4; the negative electrode of the electrolytic capacitor EC1, the other end of the capacitor C4, pin 5 of the second power supply voltage regulator chip U2, pin 6 of the second power supply voltage regulator chip U2, pin 7 of the second power supply voltage regulator chip U2, and pin 8 of the second power supply voltage regulator chip U2 are all connected to pin 4 of the second power supply voltage regulator chip U2; the other end of the capacitor C4 is connected to pin 1 of the second power supply voltage regulator chip U2.

[0029] like Figure 2As shown, in this embodiment, the output power filter module 200 includes a first output power filter unit and a second output power filter unit; the first output power filter unit includes an inductor L1, a diode D1, a diode D2, an electrolytic capacitor EC2, a capacitor C7 and a capacitor C8; one end of the inductor L1 and the cathode of the diode D1 are connected to pin 2 of the first power regulator chip U1; the anode of the diode D1, one end of the capacitor C7, one end of the capacitor C8, and pin 4 of the first power regulator chip U1 are connected to the cathode of the electrolytic capacitor EC2; the cathode of the electrolytic capacitor EC2 is connected to the output end of the second output power filter unit, and the cathode of the electrolytic capacitor EC2 is grounded; the other end of the inductor L1, the anode of the electrolytic capacitor EC2, and the other end of the capacitor C7 are all connected to the anode of the diode D2; the cathode of the diode D2 is connected to the other end of the capacitor C8, and the cathode of the diode D2 is used to output the first output power 12V+.

[0030] like Figure 2 As shown, in this embodiment, the output power filter module 200 further includes a first sampling unit; the first sampling unit includes a capacitor C5, a resistor R1 and a resistor R2; one end of the capacitor C5, one end of the resistor R1, and one end of the resistor R2 are all connected to pin 3 of the first power regulator chip U1; the other end of the capacitor C5 and the other end of the resistor R2 are both connected to the positive electrode of the diode D2; and the other end of the resistor R1 is grounded.

[0031] like Figure 2 As shown, in this embodiment, the second output power filter unit includes an inductor L2, a diode D3, a diode D4, an electrolytic capacitor C3, a capacitor C9 and a capacitor C10; one end of the inductor L2 and one end of the diode D3 are both connected to pin 2 of the second power voltage stabilizing chip U2; the positive electrode of the diode D3, one end of the capacitor C9, the negative electrode of the diode D4, and pin 4 of the second power voltage stabilizing chip U2 are all connected to the negative electrode of the electrolytic capacitor EC3; the other end of the inductor L2, the other end of the capacitor C9, and one end of the capacitor C10 are all connected to the positive electrode of the electrolytic capacitor EC3; the positive electrode of the electrolytic capacitor EC3 is connected to the negative electrode of the electrolytic capacitor EC2; the other end of the capacitor C10 is connected to the positive electrode of the diode D4; the positive electrode of the diode D4 is used to output the second output power 12V-.

[0032] like Figure 2As shown, in this embodiment, the output power filter module 200 further includes a second sampling unit; the second sampling unit includes a capacitor C6, a resistor R3 and a resistor R4; one end of the capacitor C6, one end of the resistor R3, and one end of the resistor R4 are all connected to pin 3 of the second power regulator chip U2; the other end of the capacitor C6 and the other end of the resistor R3 are both connected to the positive electrode of the electrolytic capacitor EC3; the other end of the resistor R3 is connected to the negative electrode of the diode D4.

[0033] The working principle of the single power supply to positive and negative dual power supply circuit provided in this embodiment is as follows:

[0034] The positive electrode of electrolytic capacitor EC4, one end of capacitor C2, one end of capacitor C1, one end of capacitor C3, the positive electrode of electrolytic capacitor C4, and one end of capacitor C4 are all connected to pin 1 of the same connector CN2. Connector CN2 is used to connect to a DC5--24V input power supply. Among them, electrolytic capacitor EC4 and capacitor C1 form a first input power filter unit, which is used to filter the input power connected through CN2. Capacitor C1 and capacitor C3 form a second input power filter unit, which filters the input power that has been filtered by the first input power filter unit and flows to the first power supply voltage regulator chip U1. Electrolytic capacitor EC1 and capacitor C4 form a third input power filter unit, which filters the input power that has been filtered by the first input power filter unit and flows to the second power supply voltage regulator chip U2.

[0035] The maximum output current of the first power regulator chip U1 and the second power regulator chip U2 is both 2A. Pin 1 of the first power regulator chip U1 and the second power regulator chip U2 are both power input terminals; pin 2 of the first power regulator chip U1 and the second power regulator chip U2 are both pulse switch output terminals; pin 3 of the first power regulator chip U1 and the second power regulator chip U2 are both feedback terminals. Pin 4 of the first power regulator chip U1 and the second power regulator chip U2 are both switch control terminals.

[0036] When pin 4 of the first power regulator chip U1 is high, the first power regulator chip U1 stops operating. When pin 4 of the second power regulator chip U2 is high, the second power regulator chip U2 stops operating. Therefore, pins 4 of the first power regulator chip U1 and the second power regulator chip U2 are both connected to a low level, allowing pins 4 and 8 of the first power regulator chip U1 to operate normally. Pins 5, 6, 7, and 8 of the first power regulator chip U1 are all grounded. Pins 5, 6, 7, and 8 of the second power regulator chip U2 are all floating.

[0037] Inductor L1, diode D1, diode D2, electrolytic capacitor EC2, capacitor C7, and capacitor C8 form the first output power filter unit, which is used to filter the first output power 12V+ output by the first power regulator chip U1. Diode D1 is a freewheeling diode. Inductor L1 is an energy storage inductor. Diode D2 is connected in series in the circuit to serve as a reverse polarity protection diode for the first output power.

[0038] Capacitor C5, resistor R1 and resistor R2 form a first sampling unit, which is used to sample the first output power output by the first power regulator chip U1 and feed it back to pin 3 of the first power regulator chip U1, so that the first power regulator chip U1 can adjust the duty cycle of the output pulse internally, thereby adjusting the voltage of the first output power.

[0039] Inductor L2, diode D3, diode D4, electrolytic capacitor C3, capacitor C9, and capacitor C10 form the second output power filter unit, which is used to filter the second output power 12V- output by the second power regulator chip U2. Diode D3 is a freewheeling diode. Inductor L2 is an energy storage inductor. Diode D4 is connected in series in the circuit to serve as a reverse polarity protection diode for the second output power.

[0040] Capacitor C6, resistor R3 and resistor R4 form a second sampling unit, which is used to sample the second output power output by the second power regulator chip U2 and feed it back to pin 3 of the second power regulator chip U2, so that the second power regulator chip U2 can adjust the duty cycle of the output pulse internally, thereby adjusting the voltage of the second output power.

[0041] The output power voltage V(OUT)=1.23*(1+R2 / R1), and the single power supply to positive and negative dual power supply circuit in this embodiment can output ±12V.

[0042] The second power supply voltage regulator chip U2 outputs the second output power (negative power supply) by connecting the positive electrode of electrolytic capacitor EC3 to the negative electrode of electrolytic capacitor EC2. The common point where the positive and negative electrodes of electrolytic capacitors EC3 and EC2 meet serves as the midpoint, which is then connected to the input power ground. At this point, the positive electrode of electrolytic capacitor EC2 is at +12V relative to ground, and the negative electrode of electrolytic capacitor EC3 is at -12V relative to ground.

[0043] Among them, the ground terminal of the second power supply voltage regulator chip U2 cannot be directly grounded and needs to be floating, otherwise it is equivalent to a short circuit to the ground. The negative pole of the electrolytic capacitor EC3 is connected to the ground of the input power supply, and a negative power supply can be output at the positive pole of the diode D4. The current input circuit of the second power supply voltage regulator chip U2: input from pin 1 of the second power supply voltage regulator chip U2, output from pin 5 of the second power supply voltage regulator chip U2, pin 6 of the second power supply voltage regulator chip U2, pin 7 of the second power supply voltage regulator chip U2 and pin 8 of the second power supply voltage regulator chip U2, and then form a loop to the ground through the diode D3 and the inductor L2.

[0044] By adjusting the duty cycle of the internal output pulses of the first power regulator chip U1 and the second power regulator chip U2, the DC5-24V input power voltage can be converted into a positive and negative dual power supply. This allows the single-power-to-positive-and-negative dual-power supply circuit to adapt to a variety of power inputs, thereby improving the versatility of the single-power-to-positive-and-negative dual-power supply circuit. The output power of this single-power-to-positive-and-negative dual-power supply circuit can reach 1.5A, making it compatible with most portable devices.

[0045] The basic principle of the single power supply to positive and negative dual power supply circuit in this embodiment is as follows: Figure 3 As shown, connect pin 4 of the original transformer B1 to pin 5 of the original transformer B1. In other words, it is equivalent to pulling a tap in the middle of a coil, so that the original transformer B1 can output positive and negative power.

[0046] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or arrangement of the subject combination arrangement. In addition to variations and modifications to the components and / or arrangement, other uses will also be apparent to those skilled in the art.

Claims

1. A single power supply to positive and negative dual power supply circuit, characterized in that: include: An input power filter module (100), wherein an input end of the input power filter module (100) is used to be connected to an input power source; A first power supply voltage stabilizing chip U1, wherein the input end of the first power supply voltage stabilizing chip U1 is connected to the output end of the input power supply filter module (100); A second power supply voltage stabilizing chip U2, wherein the input end of the second power supply voltage stabilizing chip U2 is connected to the output end of the input power supply filter module (100); An output power filter module (200) has an input end connected to both the output end of the first power voltage stabilizing chip U1 and the output end of the second power voltage stabilizing chip U2, and the input end of the output power filter module (200) is used to output the first output power and the second output power.

2. The single power supply to positive and negative dual power supply circuit according to claim 1, characterized in that: The first power supply voltage regulator chip U1 and the second power supply voltage regulator chip U2 are both XL1509.

3. The single power supply to positive and negative dual power supply circuit according to claim 2, characterized in that: The input power filter module (100) comprises a first input power filter unit, a second input power filter unit and a third input power filter unit; The first input power filter unit includes an electrolytic capacitor EC4 and a capacitor C2; The positive electrode of the electrolytic capacitor EC4 and one end of the capacitor C2 are both used to connect to the input power supply; The negative electrode of the electrolytic capacitor EC4 and the other end of the capacitor C2 are both grounded; The input end of the second input power filter unit and the input end of the third input power filter unit are both connected to the positive electrode of the electrolytic capacitor EC4; The output end of the second input power filter unit is connected to the input end of the first power regulator chip U1; The output end of the third input power filter unit is connected to the input end of the second power regulator chip U2.

4. The single power supply to positive and negative dual power supply circuit according to claim 3, characterized in that: The second input power filter unit includes a capacitor C1 and a capacitor C3; One end of the capacitor C1 and one end of the capacitor C3 are both connected to the positive electrode of the electrolytic capacitor EC4; The other end of the capacitor C1, the other end of the capacitor C3, pin 4 of the first power supply voltage regulator chip U1, pin 5 of the first power supply voltage regulator chip U1, pin 6 of the first power supply voltage regulator chip U1, pin 7 of the first power supply voltage regulator chip U1, and pin 8 of the first power supply voltage regulator chip U1 are all grounded; One end of the capacitor C3 is connected to pin 1 of the first power supply voltage regulator chip U1.

5. The single power supply to positive and negative dual power supply circuit according to claim 4, characterized in that: The third input power filter unit includes an electrolytic capacitor EC1 and a capacitor C4; The positive electrode of the electrolytic capacitor EC1 and one end of the capacitor C4 are both connected to the positive electrode of the electrolytic capacitor EC4; The negative electrode of the electrolytic capacitor EC1, the other end of the capacitor C4, pin 5 of the second power supply voltage regulator chip U2, pin 6 of the second power supply voltage regulator chip U2, pin 7 of the second power supply voltage regulator chip U2, and pin 8 of the second power supply voltage regulator chip U2 are all connected to pin 4 of the second power supply voltage regulator chip U2; The other end of the capacitor C4 is connected to pin 1 of the second power supply voltage regulator chip U2.

6. The single power supply to positive and negative dual power supply circuit according to claim 5, characterized in that: The output power filter module (200) comprises a first output power filter unit and a second output power filter unit; The first output power filter unit includes an inductor L1, a diode D1, a diode D2, an electrolytic capacitor EC2, a capacitor C7 and a capacitor C8; One end of the inductor L1 and the cathode of the diode D1 are both connected to pin 2 of the first power supply voltage regulator chip U1; The positive electrode of the diode D1, one end of the capacitor C7, one end of the capacitor C8, and pin 4 of the first power supply voltage regulator chip U1 are all connected to the negative electrode of the electrolytic capacitor EC2; The negative electrode of the electrolytic capacitor EC2 is connected to the output end of the second output power filter unit, and the negative electrode of the electrolytic capacitor EC2 is grounded; The other end of the inductor L1, the positive electrode of the electrolytic capacitor EC2, and the other end of the capacitor C7 are all connected to the positive electrode of the diode D2; The cathode of the diode D2 is connected to the other end of the capacitor C8 , and the cathode of the diode D2 is used to output the first output power 12V+.

7. The single power supply to positive and negative dual power supply circuit according to claim 6, characterized in that: The output power filter module (200) further includes a first sampling unit; The first sampling unit includes a capacitor C5, a resistor R1 and a resistor R2; One end of the capacitor C5, one end of the resistor R1, and one end of the resistor R2 are all connected to pin 3 of the first power supply voltage regulator chip U1; The other end of the capacitor C5 and the other end of the resistor R2 are both connected to the anode of the diode D2; The other end of the resistor R1 is grounded.

8. The single power supply to positive and negative dual power supply circuit according to claim 6, characterized in that: The second output power filter unit includes an inductor L2, a diode D3, a diode D4, an electrolytic capacitor C3, a capacitor C9 and a capacitor C10; One end of the inductor L2 and one end of the diode D3 are both connected to pin 2 of the second power supply voltage regulator chip U2; The positive electrode of the diode D3, one end of the capacitor C9, the negative electrode of the diode D4, and the pin 4 of the second power supply voltage stabilizing chip U2 are all connected to the negative electrode of the electrolytic capacitor EC3; The other end of the inductor L2, the other end of the capacitor C9, and one end of the capacitor C10 are all connected to the positive electrode of the electrolytic capacitor EC3; The positive electrode of the electrolytic capacitor EC3 is connected to the negative electrode of the electrolytic capacitor EC2; The other end of the capacitor C10 is connected to the anode of the diode D4; The anode of the diode D4 is used to output the second output power 12V-.

9. The single power supply to positive and negative dual power supply circuit according to claim 8, characterized in that: The output power filter module (200) further includes a second sampling unit; The second sampling unit includes a capacitor C6, a resistor R3 and a resistor R4; One end of the capacitor C6, one end of the resistor R3, and one end of the resistor R4 are all connected to pin 3 of the second power supply voltage regulator chip U2; The other end of the capacitor C6 and the other end of the resistor R3 are both connected to the positive electrode of the electrolytic capacitor EC3; The other end of the resistor R3 is connected to the cathode of the diode D4.

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