Non-polarity conversion circuit for power supply with polarity at input end

Abstract

The utility model provides a non-polarity conversion circuit for a power supply with polarity at an input end. The non-polarity conversion circuit comprises a switching device Q201, a switching device Q202, a switching device Q203, a switching device Q204, a switching device Q205, a switching device Q206, a switching device Q102, a switching device Q103, a first power supply input end Va, a second power supply input end Vb, a first power supply output end Vout + and a second power supply output end Vout GND. Compared with the prior art, the circuit is built by adopting the MOS tubes and the triodes for switching, and through the switch combinational logic of the MOS tubes and the triodes, whether the input ends Va and Vb of the power supply are positively connected or reversely connected, the output ends of the power supply adopt Vout + as the positive electrode and Vout GND as the negative electrode; therefore, the load RL can be supplied with power to start working under the conditions of positive connection and negative connection of the power supply. In addition, the power consumption of the circuit can be reduced, and the heat dissipation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, and particularly relates to a non-polarity conversion circuit for a polar power supply at the input end.

Background Art

[0002] During the processes of product assembly, repair, test verification, etc., it is possible for the construction worker to connect the power supply line reversely and then connect it to the product. At this time, the product may not work or be burned out and cannot continue to work due to the reverse connection of the power supply line. Or in the design, it is desired that the product can work normally whether the power supply input is connected correctly or reversely.

[0003] Please refer to Figure 1 As shown, it is a schematic diagram of a non-polarity conversion circuit for a polar power supply at the input end in the prior art. A diode full-bridge rectifier circuit 110 is added at the front end of the circuit. By using the unidirectional conductivity of diodes D101, D102, D103, and D104, regardless of whether the voltage directions of the power supply input terminals Va and Vb are correct, the power supply output terminal is Vout+ as the positive pole and Vout_GND as the negative pole. The load RL can be powered and start to work whether the power supply is connected correctly or reversely.

[0004] Figure 1 Problems and disadvantages of the prior art solution shown:

[0005] ①. When the working current of the load RL increases (for example, reaches 1A), the voltage drop from Va / Vb to Vout+ will reach about 0.5V or even larger, and it cannot be applied to circuits that are sensitive to voltage and have a small power supply range.

[0006] ②. When the working current of the load RL is large (for example, reaches 1A), the power consumption on each diode will reach about 0.5W. Therefore, a heat dissipation system needs to be made for the diodes, which will increase the cost of heat dissipation.

[0007] ③. The diode solution generates a large amount of heat and requires the installation of a radiator, which will require a larger structural space.

[0008] Therefore, it is necessary to propose a new technical solution to solve the above problems.

Content of the Utility Model

[0009] One of the purposes of the utility model is to provide a non-polarity conversion circuit for a polar power supply at the input end, which can achieve that regardless of whether the power supply input terminals Va and Vb are connected correctly or reversely, the power supply output terminal is Vout+ as the positive pole and Vout_GND as the negative pole, so that the load RL can be powered and start to work whether the power supply is connected correctly or reversely.

[0010] According to one aspect of the present utility model, the present utility model provides a non-polarity conversion circuit for a polar power supply at the input end, which includes switching devices Q201, Q202, Q203, Q204, Q205, Q206, switching devices Q102, Q103, a first power input terminal Va, a second power input terminal Vb, a first power output terminal Vout + and a second power output terminal Vout_GND. The first connection end of the switching device Q205 is connected to the first power input terminal Va, and its second connection end is connected to the first power output terminal Vout +; the first connection end of the switching device Q201 is connected to the control end of the switching device Q205, its second connection end is connected to the second power input terminal Vb, and its control end is connected to the first power input terminal Va; the first connection end of the switching device Q202 is connected to the second power input terminal Vb, its second connection end is connected to the second power output terminal Vout_GND, and its control end is connected to the first power input terminal Va; the control end of the switching device Q102 is connected to the first connection end of the switching device Q201, and its second connection end is connected to the first power input terminal Va; the first connection end of the switching device Q204 is connected to the first connection end of the switching device Q102, its second connection end is connected to the first power output terminal Vout +, and its control end is connected to the first power input terminal Va; the first connection end of the switching device Q103 is connected to the first connection end of the switching device Q204, and its control end is connected to the first connection end of the switching device Q102; the first connection end of the switching device Q206 is connected to the first power input terminal Va, and its control end is connected to the second connection end of the switching device Q103; the first connection end of the switching device Q203 is connected to the second connection end of the switching device Q206, its second connection end is connected to the second power output terminal Vout_GND, and its control end is connected to the second power input terminal Vb.

[0011] Compared with the prior art, the present utility model uses multiple MOS transistors and triodes for switching to build a circuit. Through the switching combination logic of multiple MOS transistors and triodes, it is realized that regardless of whether the power input terminals Va and Vb are connected correctly or reversely, the power output terminal is Vout + as the positive pole and Vout_GND as the negative pole, so that the load RL can be powered and start working in both the case of correct and reverse connection of the power supply. In addition, the present utility model can also reduce the power consumption of the circuit and the heat dissipation cost.

Description of the Drawings

[0012] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0013] Figure 1 It is a schematic diagram of a non-polarity conversion circuit for a polar power supply at the input end in the prior art;

[0014] Figure 2 It is a schematic diagram of a non-polarity conversion circuit for a polar power supply at the input end in one embodiment of the present utility model.

Specific Embodiments

[0015] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0016] As used herein, the term "one embodiment" or "embodiment" refers to specific features, structures, or characteristics that may be included in at least one implementation manner of the present utility model. The phrase "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that mutually excludes other embodiments. Unless otherwise specified, the words indicating electrical connection such as "coupled", "connected", "joined", and "connected" in this article all mean direct or indirect electrical connection. For example, when A is connected to B, it includes both direct electrical connection between A and B and electrical connection between A and B through electrical components or circuits.

[0017] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0018] Please refer to Figure 2 As shown, it is a schematic diagram of a non-polarity conversion circuit for a polar power supply at the input end in one embodiment of the present utility model. Figure 2The shown non-polarity conversion circuit for a polar power supply at the input end includes switching device Q201, switching device Q202, switching device Q203, switching device Q204, switching device Q205, switching device Q206, switching device Q102, switching device Q103, first power input terminal Va, second power input terminal Vb, first power output terminal Vout+ and second power output terminal Vout_GND.

[0019] Among them, the first connection end of switching device Q205 is connected to the first power input terminal Va, and its second connection end is connected to the first power output terminal Vout+; the first connection end of switching device Q201 is connected to the control end of switching device Q205, its second connection end is connected to the second power input terminal Vb, and its control end is connected to the first power input terminal Va; the first connection end of switching device Q202 is connected to the second power input terminal Vb, its second connection end is connected to the second power output terminal Vout_GND, and its control end is connected to the first power input terminal Va; the control end of switching device Q102 is connected to the first connection end of switching device Q201, and its second connection end is connected to the first power input terminal Va; the first connection end of switching device Q204 is connected to the first connection end of switching device Q102, its second connection end is connected to the first power output terminal Vout+, and its control end is connected to the first power input terminal Va; the first connection end of switching device Q103 is connected to the first connection end of switching device Q204, and its control end is connected to the first connection end of switching device Q102; the first connection end of switching device Q206 is connected to the first power input terminal Va, and its control end is connected to the second connection end of switching device Q103; the first connection end of switching device Q203 is connected to the second connection end of switching device Q206, its second connection end is connected to the second power output terminal Vout_GND, and its control end is connected to the second power input terminal Vb.

[0020] When the positive electrode of the power supply Vin210 is connected to the first power input terminal Va and the negative electrode of the power supply Vin210 is connected to the second power input terminal Vb, the switching device Q205 is turned on, the switching device Q201 is turned off, the switching device Q202 is turned on, the switching device Q102 is turned off, the switching device Q103 is turned off, the switching device Q206 is turned off, the switching device Q204 is turned off, and the switching device Q203 is turned off, so that the first power output terminal Vout+ is the positive electrode and the second power output terminal Vout_GND is the negative electrode; when the negative electrode of the power supply Vin210 is connected to the first power input terminal Va and the positive electrode of the power supply Vin210 is connected to the second power input terminal Vb, the switching device Q205 is turned off, the switching device Q201 is turned on, the switching device Q202 is turned off, the switching device Q102 is turned on, the switching device Q103 is turned on, the switching device Q206 is turned on, the switching device Q204 is turned on, and the switching device Q203 is turned on, so that the first power output terminal Vout+ is the positive electrode and the second power output terminal Vout_GND is the negative electrode.

[0021] In Figure 2 In the specific embodiment shown, one end of the load RL is connected to the first power output terminal Vout+, and the other end is connected to the second power output terminal Vout_GND; one end of the capacitor C101 is connected to the first power output terminal Vout+, and the other end is connected to the second power output terminal Vout_GND.

[0022] In Figure 2In the specific embodiment shown, the switching device Q201 is a PMOS transistor (positive channel Metal Oxide Semiconductor). The first connection end, the second connection end, and the control end of the switching device Q201 are respectively the drain, the source, and the gate of the PMOS transistor. The switching device Q202 is an NMOS transistor (N-Metal-Oxide-Semiconductor). The first connection end, the second connection end, and the control end of the switching device Q202 are respectively the drain, the source, and the gate of the NMOS transistor. The switching device Q203 is an NMOS transistor. The first connection end, the second connection end, and the control end of the switching device Q203 are respectively the drain, the source, and the gate of the NMOS transistor. The switching device Q204 is a PMOS transistor. The first connection end, the second connection end, and the control end of the switching device Q204 are respectively the drain, the source, and the gate of the PMOS transistor. The switching device Q205 is a PMOS transistor. The first connection end, the second connection end, and the control end of the switching device Q205 are respectively the drain, the source, and the gate of the PMOS transistor. The switching device Q206 is an NMOS transistor. The first connection end, the second connection end, and the control end of the switching device Q206 are respectively the source, the drain, and the gate of the NMOS transistor. The switching device Q102 is an NPN bipolar junction transistor. The first connection end, the second connection end, and the control end of the switching device Q102 are respectively the collector, the emitter, and the base of the NPN bipolar junction transistor. The switching device Q103 is a PNP bipolar junction transistor. The first connection end, the second connection end, and the control end of the switching device Q103 are respectively the emitter, the collector, and the base of the PNP bipolar junction transistor.

[0023] Figure 2 The non-polarity conversion circuit for a polar power supply at the input end shown further includes a resistor R104, a resistor R105, and a resistor R106. Among them, one end of the resistor R104 is connected to the first connection end of the switching device Q201, and the other end is connected to the control end of the switching device Q102. One end of the resistor R105 is connected to the first connection end of the switching device Q102, and the other end is connected to the first connection end of the switching device Q204. One end of the resistor R106 is connected to the first connection end of the switching device Q102, and the other end is connected to the control end of the switching device Q103. Based on the selection of the resistance values of the resistor R104, the resistor R105, and the resistor R106, a working current is set for the switching device Q102 and the switching device Q103, so that they can work reasonably in the saturation (or conduction) or cut-off state.

[0024] Figure 2The shown non-polarity conversion circuit for a polar power supply at the input end further includes resistor R101, resistor R102, resistor R107, resistor R108, resistor R109, and resistor R110. One end of resistor R101 is connected to the first power input terminal Va, and the other end is connected to the control terminal of switching device Q201; one end of resistor R102 is connected to the control terminal of switching device Q205, and the other end is connected to the first connection end of switching device Q201; one end of resistor R107 is connected to the second connection end of switching device Q103, and the other end is connected to the control terminal of switching device Q206; one end of resistor R108 is connected to the control terminal of switching device Q204, and the other end is connected to the first power input terminal Va; one end of resistor R109 is connected to the first power input terminal Va, and the other end is connected to the control terminal of switching device Q202; one end of resistor R110 is connected to the control terminal of switching device Q203, and the other end is connected to the second power input terminal Vb. It can also be said that resistor R101, resistor R102, resistor R107, resistor R108, resistor R109, and resistor R110 are respectively connected in series to the gates of MOS transistor Q201, MOS transistor Q205, MOS transistor Q206, MOS transistor Q204, MOS transistor Q202, and MOS transistor Q203. Resistor R101 is used to adjust the switching time of MOS transistor Q201; resistor R102 is used to adjust the switching time of MOS transistor Q205; resistor R107 is used to adjust the switching time of MOS transistor Q206; resistor R108 is used to adjust the switching time of MOS transistor Q204; resistor R109 is used to adjust the switching time of MOS transistor Q202; resistor R110 is used to adjust the switching time of MOS transistor Q203.

[0025] Figure 2 The shown non-polarity conversion circuit for a polar power supply at the input end further includes diode D101. The positive electrode of diode D101 is connected to the first connection end of switching device Q201, and the negative electrode is connected to the control terminal of switching device Q102 through resistor R104. The function of diode D101 is to increase the conduction voltage of triode Q102 and prevent the body diode charge of MOS transistor Q201 from being incompletely released and accidentally triggering triode Q102 into a non-cutoff state.

[0026] The following is a specific introduction Figure 2 The working process of the shown non-polarity conversion circuit for a polar power supply at the input end. Among them, the conduction voltage drop of the body diode of the MOS transistor is 0.7V, Vs is the source voltage of the MOS transistor, Vd is the drain voltage of the MOS transistor, Vgs is the gate-source voltage of the MOS transistor, and Vgs(th) is the turn-on voltage of the MOS transistor.

[0027] 1. When the power supply is connected with the positive pole (i.e., when the positive pole of the power supply Vin210 is connected to the first power input terminal Va and the negative pole of the power supply Vin210 is connected to the second power input terminal Vb): Let Vb = GND = 0V.

[0028] The gate of the MOS transistor Q201 is connected to the first power input terminal Va, and its voltage is equal to the voltage of the positive pole of the power supply Vin210. Therefore, the MOS transistor Q201 is cut off; the body diode of the MOS transistor Q205 conducts forward. Therefore, Q205_Vs≈Va - 0.7V. The body diode of the MOS transistor Q201 discharges the charge on the Vgs of the MOS transistor Q205 to the ground, making Q205_Vgs≈Q201_Vd - Q205_Vs≈0.7V-(Va - 0.7V)= -Va<Vgs(th). Therefore, the MOS transistor Q205 is turned on, and Q205_Vs≈Va = Vout+. Therefore, the first power output terminal Vout+ connected to the load RL is the positive pole.

[0029] Since the body diode of MOS transistor Q201 conducts to the ground, Q201_Vd≈0.7V (or less than 0.7V due to the absence of charge). At this time, Q102_Vbe = Q201_Vd - D101_Vf≈0V; the emitter of transistor Q102 <0.3V, and transistor Q102 is cut off. The operating current of resistors R105 and R106 is approximately equal to 0A. Therefore, Q103_Vbe≈0V, Q103_Ib = 0A, transistor Q103 is cut off, and Q206_Vs = Va. Therefore, Q206_Vgs is less than or equal to 0V, which does not satisfy Q206_Vgs≥Vgs(th), and MOS transistor Q206 is cut off. (Q204_Vd = Vb = GND = 0V) < (Q204_Vs = Va), the body diode of MOS transistor Q204 is cut off, Q204_Vgs = Va - Vout+ = Va - Va = 0V, and MOS transistor Q204 is cut off. Therefore, the current at the first power supply output terminal Vout+ will not be short-circuited to the second power supply input terminal Vb. The current at the second power supply output terminal Vout_GND flows through MOS transistor Q202, and the current direction is the same as that of the body diode of MOS transistor Q202. The body diode of MOS transistor Q202 conducts forwardly. Therefore, Q202_Vs≈0.7V, Q202_Vgs≈Va - 0.7V≥Vgs(th), and MOS transistor Q202 conducts. Therefore, Q202_Vs≈Vb = GND = Vout_GND = Q203_Vs = 0V, Q203_Vgs = Vb - Q203_Vs = 0V, and MOS transistor Q203 is cut off. At the same time, since MOS transistor Q206 is also cut off, the body diodes of MOS transistors Q206 and Q203 are connected in series in the opposite direction. Therefore, the body diodes of MOS transistors Q206 and Q203 are both cut off. Therefore, the second power supply output terminal Vout_GND connected to the load RL is the negative pole, and the first power supply input terminal Va cannot be short-circuited to the second power supply output terminal Vout_GND through MOS transistors Q206 and Q203.

[0030] At this time, the conduction voltage drop from Va to Vout+ = I_RL * R_Q205 (assuming I_RL = 1A and R_Q205 = 20mΩ, the voltage drop is 20mV).

[0031] 2. When the power supply is connected in reverse (i.e., the negative pole of power supply Vin210 is connected to the first power supply input terminal Va, and the positive pole of power supply Vin210 is connected to the second power supply input terminal Vb): Assume Va = GND = 0V.

[0032] The body diode of MOS transistor Q204 conducts, so Q204_Vs≈Vb - 0.7V, Q204_Vgs≈Va - (Vb - 0.7V) = -Vb + 0.7V, which satisfies Vgs < Vgs(th). Therefore, MOS transistor Q204 conducts, and Q204_Vs≈Vb = Vout+. Thus, the first power output terminal Vout+ connected to the load RL is the positive pole.

[0033] Q201_Vgs = Va - Vb = -Vb, which satisfies Vgs less than Vgs(th), and MOS transistor Q201 conducts. So Q201_Vd≈Q201_Vs = Vb, Q205_Vgs = Q201_Vd - Vout+≈Vb - Vb = 0V. Therefore, MOS transistor Q205 is cut off. Thus, the current at the first power output terminal Vout+ will not be short-circuited to the first power input terminal Va. Q102_Ib = (Q201_Vd - D101_Vf - Q102_Vbe) / R104≈(Vb - 0.7V - 0.7V) / R104. The resistance R104 is designed to make the triode Q102 saturated, Q102_Vce≈0.3V, Q103_Ib = (Vb - Q103_Vbe - Q102_Vce) / R106≈(Vb - 0.7V - 0.3V) / R106. The resistance R106 is designed to make the triode Q103 saturated, Q206_Vgs = Q206_Vg - Q206_Vs = (Vb - Q103_Vce) - Va≈Vb - 0.3V > Vgs(th). Therefore, MOS transistor Q206 conducts. The current at the second power output terminal Vout_GND connected to the load RL flows through MOS transistor Q203, and the current direction is the same as that of the body diode of MOS transistor Q203. And MOS transistor Q206 is in the conducting state. Therefore, the body diode of MOS transistor Q203 conducts, Q203_Vs≈0.7V, Q203_Vgs≈Vb - Q203_Vs≈Vb - 0.7V > Vgs(th), and MOS transistor Q203 conducts. So Q203_Vs≈Va = GND = Vout_GND = 0V, Q202_Vgs = Va - Q202_Vs = Va - Vout_GND≈Va - Va = 0V < Vgs(th), and MOS transistor Q202 is cut off. Thus, the second power output terminal Vout_GND connected to the load RL is the negative pole, and the second power input terminal Vb cannot be short-circuited to the second power output terminal Vout_GND through MOS transistor Q202.

[0034] At this time, the conduction voltage drop from the second power input terminal Vb to the first power output terminal Vout+ = I_RL * R_Q204 (assuming I_RL = 1A, R_Q204 = 20mΩ, then the voltage drop is 20mV).

[0035] That is to say, when the first power input terminal Va is positive and the second power input terminal Vb is negative, the body diode of the MOS transistor Q201 conducts, causing the MOS transistor Q205 to conduct. Eventually, the first power output terminal Vout+ connected to the load RL is positive; the triodes Q102 and Q103 are cut off, and the MOS transistors Q204, Q206, and Q203 are disconnected (or cut off). The MOS transistor Q202 conducts, and the second power output terminal Vout_GND is conducted to the second power input terminal Vb. Eventually, the second power output terminal Vout_GND connected to the load RL is negative. Conversely, when the first power input terminal Va is negative and the second power input terminal Vb is positive, the MOS transistors Q204 and Q201 conduct, and the MOS transistor Q205 is turned off (or cut off). Eventually, the first power output terminal Vout+ connected to the load RL is positive; the triodes Q102 and Q103 are saturated (or conduct), the MOS transistors Q206 and Q203 conduct, and the MOS transistor Q202 is cut off. The second power output terminal Vout_GND is conducted to the first power input terminal Va. Eventually, the second power output terminal Vout_GND connected to the load RL is negative. In this way, when the input power supply is connected in the forward or reverse direction, the first power output terminal Vout+ connected to the load RL can be made positive, and the second power output terminal Vout_GND can be made negative. The load RL can be powered and start working in both the forward and reverse connection cases of the power supply, and the voltage drop from the power supply Va / Vb to Vout+ is only 20 mV.

[0036] It should be particularly noted that:

[0037] 1. In the non-polarity conversion circuit for a polar power supply at the input end in the present invention, the triodes Q102 and Q103 can be replaced by a suitable MOS transistor solution for their switching function; or the MOS transistors Q201, Q202, Q203, Q204, Q205, and Q206 can be replaced by triodes.

[0038] 2. In the non-polarity conversion circuit for a polar power supply at the input end in the present invention, the driving circuits of the triodes Q102 and Q103, or the MOS transistors Q201, Q202, Q203, Q204, Q205, and Q206 can appropriately add MLCC (Multilayer Ceramic Capacitors, i.e., chip capacitors) to filter out high-frequency signals during the switching instant.

[0039] In summary, the non-polarity conversion circuit for a polar power supply at the input end provided by the present utility model uses multiple MOS transistors and triodes for the switch to build the circuit. When the first power input terminal Va is positive and the second power input terminal Vb is negative, through the switching combination logic of the MOS transistor and the triode, the first power output terminal Vout+ output to the load RL is positive, and the second power output terminal Vout_GND is negative; conversely, when the first power input terminal Va is negative and the second power input terminal Vb is positive, through the switching combination logic of the MOS transistor and the triode, the first power output terminal Vout+ output to the load RL is still positive, and the second power output terminal Vout_GND is still negative; thus, when the wire harness at the power input end is connected correctly or reversely, the load RL can work normally. In addition, since the working current of the present utility model (for example: 1A) mainly flows through the MOS transistor, and the on-state DC resistance of the MOS transistor is extremely small (about 20mΩ per piece), and the voltage drop is only about 20mV, that is, the voltage drop from the power input terminal Va / Vb to the power output terminal Vout+ is only 20mV, and the power consumption is only 20mW. Therefore, the heat generated by this circuit compared with the existing design scheme will be smaller, and even no additional radiator is required, and the impact on the structural space is small. At the same time, it does not affect the original circuit design of RL.

[0040] It should be noted that any changes made by those skilled in the art to the specific implementation manners of the present utility model do not depart from the scope of the claims of the present utility model. Correspondingly, the scope of the claims of the present utility model is not limited solely to the foregoing specific implementation manners.

Claims

1. A non-polarity conversion circuit for a polarity power supply at the input end, characterized in that: It includes a switch device Q201, a switch device Q202, a switch device Q203, a switch device Q204, a switch device Q205, a switch device Q206, a switch device Q102, a switch device Q103, a first power input terminal Va, a second power input terminal Vb, a first power output terminal Vout+ and a second power output terminal Vout_GND, The first connection end of the switch device Q205 is connected to the first power input terminal Va, and the second connection end thereof is connected to the first power output terminal Vout+; the first connection end of the switch device Q201 is connected to the control end of the switch device Q205, the second connection end thereof is connected to the second power input terminal Vb, and the control end thereof is connected to the first power input terminal Va; the first connection end of the switch device Q202 is connected to the second power input terminal Vb, the second connection end thereof is connected to the second power output terminal Vout_GND, and the control end thereof is connected to the first power input terminal Va; the control end of the switch device Q102 is connected to the first connection end of the switch device Q201, and the second connection end thereof is connected to the first power input terminal Va; The first connection end of 204 is connected to the first connection end of the switching device Q102, the second connection end thereof is connected to the first power output terminal Vout+, and the control end thereof is connected to the first power input terminal Va; the first connection end of the switching device Q103 is connected to the first connection end of the switching device Q204, and the control end thereof is connected to the first connection end of the switching device Q102; the first connection end of the switching device Q206 is connected to the first power input terminal Va, and the control end thereof is connected to the second connection end of the switching device Q103; the first connection end of the switching device Q203 is connected to the second connection end of the switching device Q206, the second connection end thereof is connected to the second power output terminal Vout_GND, and the control end thereof is connected to the second power input terminal Vb.

2. The non-polarity conversion circuit for a power supply with polarity at the input end according to claim 1, characterized in that: When the positive electrode of the power supply Vin is connected to the first power supply input terminal Va and the negative electrode of the power supply Vin is connected to the second power supply input terminal Vb, the switch device Q205 is turned on, the switch device Q201 is turned off, the switch device Q202 is turned on, the switch device Q102 is turned off, the switch device Q103 is turned off, the switch device Q206 is turned off, the switch device Q204 is turned off, and the switch device Q203 is turned off, so that the first power supply output terminal Vout+ is the positive electrode and the second power supply output terminal Vout_GND is the negative electrode; When the negative electrode of the power supply Vin is connected to the first power input terminal Va and the positive electrode of the power supply Vin is connected to the second power input terminal Vb, the switching device Q205 is turned off, the switching device Q201 is turned on, the switching device Q202 is turned off, the switching device Q102 is turned on, the switching device Q103 is turned on, the switching device Q206 is turned on, the switching device Q204 is turned on, and the switching device Q203 is turned on, so that the first power output terminal Vout+ is the positive electrode and the second power output terminal Vout_GND is the negative electrode.

3. The non-polarity conversion circuit for a power supply with polarity at the input end according to claim 2, characterized in that: The switch device Q201 is a PMOS tube, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q201 are respectively the drain, the source and the gate of the PMOS tube; The switch device Q202 is an NMOS tube, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q202 are respectively the drain, the source and the gate of the NMOS tube; The switch device Q203 is an NMOS tube, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q203 are the drain, the source and the gate of the NMOS tube respectively; The switch device Q204 is a PMOS tube, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q204 are respectively the drain, the source and the gate of the PMOS tube; The switch device Q205 is a PMOS tube, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q205 are respectively the drain, the source and the gate of the PMOS tube; The switch device Q206 is an NMOS tube, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q206 are the source, the drain and the gate of the NMOS tube respectively; The switch device Q102 is an NPN transistor, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q102 are respectively the collector, the emitter and the base of the NPN transistor; The switch device Q103 is a PNP type transistor, and the first connection terminal, the second connection terminal and the control terminal of the switch device Q103 are respectively the emitter, the collector and the base of the PNP type transistor.

4. The non-polarity conversion circuit for a power source with polarity at the input end according to claim 3, characterized in that: It also includes resistors R104, R105, and R106. One end of the resistor R104 is connected to the first connection end of the switching device Q201, and the other end thereof is connected to the control end of the switching device Q102; one end of the resistor R105 is connected to the first connection end of the switching device Q102, and the other end thereof is connected to the first connection end of the switching device Q204; one end of the resistor R106 is connected to the first connection end of the switching device Q102, and the other end thereof is connected to the control end of the switching device Q103.

5. The non-polarity conversion circuit for a power source with polarity at the input end according to claim 4, characterized in that: Based on the selection of the resistance values ​​of the resistors R104, R105 and R106, the operating current is set for the switching device Q102 and the switching device Q103, so that the switching device Q102 and the switching device Q103 can operate in a saturation or cut-off state.

6. The non-polarity conversion circuit for a power source with polarity at the input end according to claim 4, characterized in that: It also includes a resistor R101, a resistor R102, a resistor R107, a resistor R108, a resistor R109, and a resistor R110. One end of the resistor R101 is connected to the first power input terminal Va, and the other end thereof is connected to the control terminal of the switch device Q201; One end of the resistor R102 is connected to the control end of the switch device Q205, and the other end thereof is connected to the first connection end of the switch device Q201; One end of the resistor R107 is connected to the second connection end of the switch device Q103, and the other end of the resistor R107 is connected to the control end of the switch device Q206; One end of the resistor R108 is connected to the control end of the switch device Q204, and the other end thereof is connected to the first power input terminal Va; One end of the resistor R109 is connected to the first power input terminal Va, and the other end thereof is connected to the control terminal of the switch device Q202; One end of the resistor R110 is connected to the control end of the switch device Q203, and the other end of the resistor R110 is connected to the second power input end Vb.

7. The non-polarity conversion circuit for a power source with polarity at the input end according to claim 6, characterized in that: The resistor R101 is used to adjust the switching time of the switch device Q201; The resistor R102 is used to adjust the switching time of the switch device Q205; The resistor R107 is used to adjust the switching time of the switch device Q206; The resistor R108 is used to adjust the switching time of the switch device Q204; The resistor R109 is used to adjust the switching time of the switch device Q202; The resistor R110 is used to adjust the switching time of the switching device Q203.

8. The non-polarity conversion circuit for a power source with polarity at the input end according to claim 6, characterized in that: Also includes diode D101, The anode of the diode D101 is connected to the first connection terminal of the switch device Q201, and the cathode of the diode D101 is connected to the control terminal of the switch device Q102 via the resistor R104.

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