Direct-current voltage-stabilizing dual-power-supply circuit

Abstract

The utility model discloses a direct-current voltage-stabilizing dual-power-supply circuit, which relates to the technical field of dual power supplies and comprises a first power supply module, a second power supply module and a third power supply module, the second power supply module is used for power supply and adjustable voltage stabilization; the output detection module is used for performing isobaric detection on the first power supply module and the second power supply module; the first control module is used for controlling the parallel power supply module to transmit electric energy and controlling the first output module to be powered off when the voltage is equal and the electric energy current input to the second output module needs to be increased; the second control module is used for controlling the parallel power supply module to transmit electric energy and controlling the second output module to be powered off when the voltage is equal and the electric energy current input to the first output module needs to be increased; the parallel power supply module is used for transmitting electric energy; and the first output module and the second output module are both used for electric energy transmission control. The direct-current voltage-stabilizing dual-power-supply circuit provided by the utility model can carry out isobaric parallel power supply, improves output current, meets power supply requirements, and improves power supply safety.

Description

Technical Field

[0001] This utility model relates to the field of dual power supply technology, specifically a DC regulated dual power supply circuit. Background Technology

[0002] A DC regulated power supply is an electronic device that provides a stable DC power supply to a load device and has wide applications in various fields, such as the power industry and automation equipment. Current DC regulated power supplies typically employ dual DC regulated power supplies to provide multiple outputs, meeting power demands and allowing parallel supply when the required current of connected electronic equipment increases. However, when dual DC regulated power supplies are connected in parallel, the inability to automatically determine whether the output voltages of the two power supplies are equal can lead to the lower voltage power supply becoming a load on the higher voltage power supply, ultimately damaging the dual DC regulated power supply. Therefore, improvements are needed. Utility Model Content

[0003] This utility model provides a DC regulated dual power supply circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A DC regulated dual power supply circuit includes: a first power supply module, a second power supply module, an output detection module, a first control module, a second control module, a parallel power supply module, a first output module, and a second output module.

[0006] The first power supply module is used to provide the first DC power and perform adjustable voltage regulation on the first DC power, and output the first power.

[0007] The second power module is used to provide the second DC power and perform adjustable voltage regulation on the second DC power, and output the second power.

[0008] An output detection module, connected to the first power module and the second power module, is used to sample the first electrical energy and output a first sampling signal, sample the second electrical energy and output a second sampling signal, and output a first control signal when the voltage of the first sampling signal is equal to the voltage of the second sampling signal.

[0009] The first control module is connected to the first power module, the output detection module and the second control module. It is used to output a first parallel signal when it receives the first electrical energy and the first control signal, and to stop outputting the first parallel signal when it receives the second parallel signal output by the second control module.

[0010] The second control module is connected to the second power module and the output detection module. It is used to output a second parallel signal when it receives the second electrical energy and the first control signal, and to stop outputting the second parallel signal when it receives the first parallel signal.

[0011] A parallel power supply module is connected to the first control module, the second control module, the first power supply module, and the second power supply module. When a first parallel signal is received, it transmits the first electrical energy to the second power supply module and connects it in parallel with the second electrical energy to output the third electrical energy. When a second parallel signal is received, it transmits the second electrical energy to the first power supply module and connects it in parallel with the first electrical energy to output the fourth electrical energy.

[0012] The first output module is connected to the first control module and the first power module, and is used to receive the first electrical energy or the fourth electrical energy. When the first parallel signal is received, the first electrical energy is stopped.

[0013] The second output module is connected to the second control module and the second power supply module, and is used to receive the second electrical energy or the third electrical energy. When the second parallel signal is received, the second electrical energy is stopped.

[0014] As a further embodiment of this utility model: the first power supply module includes a first power supply, a first capacitor, a first voltage regulator, a first resistor, a first potentiometer, a second capacitor, and a first diode; the second power supply module includes a second power supply, an adjustable voltage regulator, and a second diode;

[0015] Preferably, the first power supply is connected to the IN terminal of the first voltage regulator and one end of the first capacitor. The OUT terminal of the first voltage regulator is connected to the anode of the first diode and one end of the second capacitor, and is connected to the ADJ terminal of the first voltage regulator and one end of the first potentiometer through the first resistor. The first terminal of the second power supply is connected to the input terminal of the controllable voltage regulator. The output terminal of the controllable voltage regulator is connected to the anode of the second diode. The cathode of the second diode is connected to the second output module. The second terminal of the second power supply is connected to the second terminal of the first power supply, the other end of the first capacitor, the ground terminal of the adjustable voltage regulator, the other end of the first potentiometer, the slider terminal of the first potentiometer, the other end of the second capacitor, and the ground terminal. The cathode of the first diode is connected to the first output module.

[0016] As a further embodiment of this utility model: the first output module includes a third resistor, a third power transistor, a second switching transistor, a fourth resistor, and a first output port;

[0017] Preferably, the drain of the third power transistor is connected to the cathode of the first diode and is connected to the gate of the third power transistor and the collector of the second switching transistor through the third resistor. The source of the third power transistor is connected to the first terminal of the first output port. The base of the second switching transistor is connected to the first terminal of the fourth resistor. The second terminal of the fourth resistor is connected to the first control module. The emitter of the second switching transistor is connected to the second terminal of the first output port and the ground terminal.

[0018] As a further embodiment of this utility model: the second output module includes a seventh resistor, a fourth power transistor, a fourth switching transistor, a sixth resistor, and a second output port;

[0019] Preferably, the drain of the fourth power transistor is connected to the cathode of the second diode and is connected to the gate of the fourth power transistor and the collector of the fourth switching transistor through the seventh resistor. The gate of the fourth power transistor is connected to the first terminal of the second output port. The second terminal of the second output port is connected to the emitter and ground of the fourth switching transistor. The base of the fourth switching transistor is connected to the first terminal of the sixth resistor. The second terminal of the sixth resistor is connected to the second control module.

[0020] As a further embodiment of this utility model: the first control module includes a second resistor, a first push-button switch, a first logic chip, and a first switching transistor; the parallel power supply module includes a first power transistor and a second power transistor;

[0021] Preferably, one end of the second resistor is connected to the drain of the first power transistor and the cathode of the first diode, the other end of the second resistor is connected to the stationary end of the first push-button switch, the moving end of the first push-button switch is connected to the collector of the first switching transistor and the B terminal of the first logic chip, the emitter of the first switching transistor is grounded, the A terminal of the first logic chip is connected to the output detection module, the Y terminal of the first logic chip is connected to the second end of the fourth resistor and the gate of the first power transistor, the source of the first power transistor is connected to the source of the second power transistor, the drain of the second power transistor is connected to the cathode of the second diode, and the gate of the second power transistor is connected to the second control module.

[0022] As a further embodiment of this utility model: the second control module includes a second logic chip, a fifth resistor, a second push button switch, and a third switching transistor;

[0023] Preferably, the Y terminal of the second logic chip is connected to the gate of the second power transistor and the second terminal of the sixth resistor; the A terminal of the second logic chip is connected to the output detection module; the B terminal of the second logic chip is connected to the moving terminal of the second push-button switch, the base of the first switching transistor, and the collector of the third switching transistor; the base of the third switching transistor is connected to the collector of the first switching transistor; the emitter of the third switching transistor is grounded; and the stationary terminal of the second push-button switch is connected to the cathode of the second diode through the fifth resistor.

[0024] As a further embodiment of this utility model: the output detection module includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first comparator, a second comparator, and a first inverter;

[0025] Preferably, the non-inverting input of the first comparator is connected to the inverting input of the second comparator and one end of the eighth resistor, and grounded through the ninth resistor; the inverting input of the first comparator is connected to the non-inverting input of the second comparator and one end of the tenth resistor, and grounded through the eleventh resistor; the other ends of the eighth resistor and the tenth resistor are respectively connected to the OUT terminal of the first voltage regulator and the output terminal of the adjustable voltage regulator; the output terminal of the first comparator is connected to the output terminal of the second comparator and the input terminal of the first inverter; and the output terminal of the first inverter is connected to the A terminal of the first logic chip and the A terminal of the second logic chip.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: The DC regulated dual power supply circuit of this utility model supplies power to the first output module by the first power supply module and to the second output module by the second power supply module. When it is necessary to increase the supply current of the first output module, the output detection module detects whether the output voltages of the first power supply module and the second power supply module are equal. When the voltages are equal, the second control module controls the parallel power supply module to transfer the electrical energy output by the second power supply module to the first power supply module, and the second output module stops supplying power to achieve equal voltage parallel power supply. Similarly, when it is necessary to increase the supply current of the second output module and the output voltage is equal, parallel power supply is performed to increase the output current, meet the power supply requirements, and improve power supply safety. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic block diagram of a DC regulated dual power supply circuit provided for an example of this utility model.

[0029] Figure 2 A circuit diagram of a DC regulated dual power supply circuit provided for this utility model embodiment.

[0030] Figure 3 The connection circuit diagram of the output detection module provided for this utility model embodiment. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In one embodiment, see Figure 1 A DC regulated dual power supply circuit includes: a first power supply module 1, a second power supply module 2, an output detection module 3, a first control module 4, a second control module 5, a parallel power supply module 6, a first output module 7, and a second output module 8.

[0033] Specifically, the first power module 1 is used to provide first DC power and perform adjustable voltage regulation on the first DC power, and output the first power.

[0034] The second power module 2 is used to provide the second DC power and perform adjustable voltage regulation on the second DC power, and output the second power.

[0035] The output detection module 3 is connected to the first power module 1 and the second power module 2. It is used to sample the first electrical energy and output a first sampling signal, sample the second electrical energy and output a second sampling signal, and output a first control signal when the voltage of the first sampling signal is equal to the voltage of the second sampling signal.

[0036] The first control module 4 is connected to the first power module 1, the output detection module 3 and the second control module 5. It is used to output a first parallel signal when it receives the first electrical energy and the first control signal, and to stop outputting the first parallel signal when it receives the second parallel signal output by the second control module 5.

[0037] The second control module 5 is connected to the second power module 2 and the output detection module 3. It is used to output a second parallel signal when it receives the second electrical energy and the first control signal, and to stop outputting the second parallel signal when it receives the first parallel signal.

[0038] The parallel power supply module 6 is connected to the first control module 4, the second control module 5, the first power module 1 and the second power module 2. When receiving the first parallel signal, it transmits the first electrical energy to the second power module 2 and connects it in parallel with the second electrical energy to output the third electrical energy. When receiving the second parallel signal, it transmits the second electrical energy to the first power module 1 and connects it in parallel with the first electrical energy to output the fourth electrical energy.

[0039] The first output module 7 is connected to the first control module 4 and the first power module 1, and is used to receive the first electrical energy or the fourth electrical energy. When the first parallel signal is received, the first electrical energy is stopped.

[0040] The second output module 8 is connected to the second control module 5 and the second power module 2, and is used to receive the second electrical energy or the third electrical energy. When the second parallel signal is received, the receiving of the second electrical energy is stopped.

[0041] In a specific embodiment, the first power module 1 can be a first power circuit composed of a power supply, a voltage regulator, and resistors, which can provide electrical energy and perform adjustable voltage regulation; the second power module 2 can be a second power circuit composed of a power supply, an adjustable voltage regulator, and diodes, which can provide electrical energy and perform adjustable voltage regulation; the output detection module 3 can be an output detection circuit composed of resistors, comparators, and inverters, which can perform voltage division sampling on the first power module 1 and the second power module 2, and detect whether the voltage of the electrical energy output by the first power module 1 and the second power module 2 is equal; the first control module 4 can be a first control circuit composed of logic chips, push-button switches, transistors, etc., which can control the circuit when the voltages output by the first power module 1 and the second power module 2 are equal. The parallel power supply module 6 is controlled by a button to transmit power. The second control module 5 can be a second control circuit composed of logic chips, button switches, transistors, etc. When the output voltages of the first power supply module 1 and the second power supply module 2 are equal, the parallel power supply module 6 can be controlled by a button to transmit power. The parallel power supply module 6 can be a parallel power supply circuit composed of field-effect transistors to control bidirectional power transmission. The first output module 7 can be a first output circuit composed of an output port, field-effect transistors, transistors, etc., which can control the transmission of power and supply power to connected electronic devices. The second output module 8 can be a second output circuit composed of an output port, field-effect transistors, transistors, etc., which can control the transmission of power and supply power to connected electronic devices.

[0042] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The first power module 1 includes a first power supply, a first capacitor C1, a first voltage regulator IC1, a first resistor R1, a first potentiometer RP1, a second capacitor C2, and a first diode D1; the second power module 2 includes a second power supply, an adjustable voltage regulator, and a second diode D2.

[0043] Specifically, the first power supply is connected to the IN terminal of the first voltage regulator IC1 and one end of the first capacitor C1. The OUT terminal of the first voltage regulator IC1 is connected to the anode of the first diode D1 and one end of the second capacitor C2, and is connected to the ADJ terminal of the first voltage regulator IC1 and one end of the first potentiometer RP1 through the first resistor R1. The first terminal of the second power supply is connected to the input terminal of the controllable voltage regulator. The output terminal of the controllable voltage regulator is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the second output module 8. The second terminal of the second power supply is connected to the second terminal of the first power supply, the other end of the first capacitor C1, the ground terminal of the adjustable voltage regulator, the other end of the first potentiometer RP1, the slider terminal of the first potentiometer RP1, the other end of the second capacitor C2, and the ground terminal. The cathode of the first diode D1 is connected to the first output module 7.

[0044] In a specific embodiment, the first voltage regulator IC1 can be an LM317 voltage regulator; the circuit structure of the adjustable voltage regulator is the same as that of the first capacitor C1, the first voltage regulator IC1, the first resistor R1, the first potentiometer RP1, and the second capacitor C2; both the first power supply and the second power supply can provide DC power.

[0045] Furthermore, the first output module 7 includes a third resistor R3, a third power transistor Q3, a second switch transistor V2, a fourth resistor R4, and a first output port;

[0046] Specifically, the drain of the third power transistor Q3 is connected to the cathode of the first diode D1 and is connected to the gate of the third power transistor Q3 and the collector of the second switch transistor V2 through the third resistor R3. The source of the third power transistor Q3 is connected to the first terminal of the first output port. The base of the second switch transistor V2 is connected to the first terminal of the fourth resistor R4. The second terminal of the fourth resistor R4 is connected to the first control module 4. The emitter of the second switch transistor V2 is connected to the second terminal of the first output port and the ground terminal.

[0047] In a specific embodiment, the third power transistor Q3 can be an N-channel MOSFET; the second switching transistor V2 can be an NPN transistor; and the first output port is connected to the power supply terminal of the electronic device.

[0048] Furthermore, the second output module 8 includes a seventh resistor R7, a fourth power transistor Q4, a fourth switching transistor V4, a sixth resistor R6, and a second output port;

[0049] Specifically, the drain of the fourth power transistor Q4 is connected to the cathode of the second diode D2 and is connected to the gate of the fourth power transistor Q4 and the collector of the fourth switching transistor V4 through the seventh resistor R7. The gate of the fourth power transistor Q4 is connected to the first terminal of the second output port. The second terminal of the second output port is connected to the emitter of the fourth switching transistor V4 and the ground terminal. The base of the fourth switching transistor V4 is connected to the first terminal of the sixth resistor R6. The second terminal of the sixth resistor R6 is connected to the second control module 5.

[0050] In a specific embodiment, the fourth power transistor Q4 can be an N-channel MOSFET; the fourth switching transistor V4 can be an NPN transistor; and the second output port can be connected to the power supply terminal of the electronic device.

[0051] Furthermore, the first control module 4 includes a second resistor R2, a first push-button switch S1, a first logic chip J1, and a first switching transistor V1; the parallel power supply module 6 includes a first power transistor Q1 and a second power transistor Q2;

[0052] Specifically, one end of the second resistor R2 is connected to the drain of the first power transistor Q1 and the cathode of the first diode D1, and the other end of the second resistor R2 is connected to the stationary end of the first push-button switch S1. The moving end of the first push-button switch S1 is connected to the collector of the first switching transistor V1 and the B terminal of the first logic chip J1. The emitter of the first switching transistor V1 is grounded. The A terminal of the first logic chip J1 is connected to the output detection module 3. The Y terminal of the first logic chip J1 is connected to the second end of the fourth resistor R4 and the gate of the first power transistor Q1. The source of the first power transistor Q1 is connected to the source of the second power transistor Q2. The drain of the second power transistor Q2 is connected to the cathode of the second diode D2. The gate of the second power transistor Q2 is connected to the second control module 5.

[0053] In a specific embodiment, the first logic chip J1 can be an AND gate chip; the first switch V1 can be an NPN transistor; and the first power transistor Q1 and the second power transistor Q2 can both be N-channel field-effect transistors.

[0054] Furthermore, the second control module 5 includes a second logic chip J2, a fifth resistor R5, a second push button switch S2, and a third switch transistor V3;

[0055] Specifically, the Y terminal of the second logic chip J2 is connected to the gate of the second power transistor Q2 and the second terminal of the sixth resistor R6. The A terminal of the second logic chip J2 is connected to the output detection module 3. The B terminal of the second logic chip J2 is connected to the moving terminal of the second push button switch S2, the base of the first switching transistor V1, and the collector of the third switching transistor V3. The base of the third switching transistor V3 is connected to the collector of the first switching transistor V1. The emitter of the third switching transistor V3 is grounded. The stationary terminal of the second push button switch S2 is connected to the cathode of the second diode D2 through the fifth resistor R5.

[0056] In a specific embodiment, the second logic chip J2 can be an AND gate chip; the third switch V3 can be an NPN transistor.

[0057] Furthermore, the output detection module 3 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first comparator A1, a second comparator A2, and a first inverter INV1;

[0058] Specifically, the non-inverting input of the first comparator A1 is connected to the inverting input of the second comparator A2 and one end of the eighth resistor R8, and grounded through the ninth resistor R9. The inverting input of the first comparator A1 is connected to the non-inverting input of the second comparator A2 and one end of the tenth resistor R10, and grounded through the eleventh resistor R11. The other ends of the eighth resistor R8 and the tenth resistor R10 are respectively connected to the OUT terminal of the first voltage regulator IC1 and the output terminal of the adjustable voltage regulator. The output terminal of the first comparator A1 is connected to the output terminal of the second comparator A2 and the input terminal of the first inverter INV1. The output terminal of the first inverter INV1 is connected to the A terminal of the first logic chip J1 and the A terminal of the second logic chip J2.

[0059] In a specific embodiment, the eighth resistor R8 and the ninth resistor R9 sample the voltage of the power output of the first voltage regulator IC1, and the tenth resistor R10 and the eleventh resistor R11 sample the voltage of the power output of the adjustable voltage regulator; the first comparator A1 and the second comparator A2 can both be LM358 comparators; the first inverter INV1 can be a NOT gate chip.

[0060] In this embodiment of a DC-DC regulated dual-power supply circuit, a first power supply provides first DC power. A first voltage regulator IC1, in conjunction with a first capacitor C1, a second capacitor C2, a first resistor R1, and a first potentiometer RP1, performs adjustable voltage regulation on the first DC power and outputs the first power. The first power is transmitted to the first output port through a first diode D1 and a third power transistor Q3. A second power supply provides second DC power. An adjustable voltage regulator performs adjustable voltage regulation on the second DC power and outputs the second power. The second power is transmitted to the second output port through a second diode D2 and a fourth power transistor Q4. When it is necessary to increase the current input to the second output port, the voltage output by the adjustable voltage regulator needs to be adjusted to be equal to the voltage output by the first voltage regulator IC1. An eighth resistor R8 and a ninth resistor R9 further regulate the voltage output by the first voltage regulator IC1. Voltage sampling is performed. The tenth resistor R10 and the eleventh resistor R11 sample the voltage output of the adjustable voltage regulator. The sampled signal is compared by the first comparator A1 and the second comparator A2. If the voltage output of the adjustable voltage regulator is equal to the voltage output of the first voltage regulator IC1, the first inverter INV1 outputs a high level. At this time, the first button switch S1 is closed, the third switch V3 is turned on, and the first logic chip J1 controls the first power transistor Q1 and the second switch V2 to turn on, so that the first electrical energy is transmitted to the second output port through the first power transistor Q1, the second power transistor Q2 and the fourth power transistor Q4. Similarly, when the second button switch S2 is pressed, the second electrical energy output by the adjustable voltage regulator is transmitted through the second diode D2, the second power transistor Q2 and the first power transistor Q1, and is connected in parallel with the first electrical energy for power supply.

[0061] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A direct-current voltage-stabilized dual power supply circuit, characterized in that, the direct-current voltage-stabilized dual power supply circuit comprises a first power supply module, a second power supply module, an output detection module, a first control module, a second control module, a parallel power supply module, a first output module and a second output module; the first power supply module is configured to provide first direct-current electric energy and perform adjustable voltage stabilization on the first direct-current electric energy, and output first electric energy; the second power supply module is configured to provide second direct-current electric energy and perform adjustable voltage stabilization on the second direct-current electric energy, and output second electric energy; the output detection module is connected with the first power supply module and the second power supply module, configured to sample the first electric energy and output a first sampling signal, sample the second electric energy and output a second sampling signal, and output a first control signal when the voltage of the first sampling signal is equal to the voltage of the second sampling signal; the first control module is connected with the first power supply module, the output detection module and the second control module, configured to output a first parallel signal when receiving the first electric energy and the first control signal, and stop outputting the first parallel signal when receiving a second parallel signal output by the second control module; the second control module is connected with the second power supply module and the output detection module, configured to output the second parallel signal when receiving the second electric energy and the first control signal, and stop outputting the second parallel signal when receiving the first parallel signal; the parallel power supply module is connected with the first control module, the second control module, the first power supply module and the second power supply module, configured to transmit the first electric energy to the second power supply module and parallel the second electric energy when receiving the first parallel signal, output third electric energy, and transmit the second electric energy to the first power supply module and parallel the first electric energy when receiving the second parallel signal, output fourth electric energy; the first output module is connected with the first control module and the first power supply module, configured to receive the first electric energy or the fourth electric energy, and stop receiving the first electric energy when receiving the first parallel signal; the second output module is connected with the second control module and the second power supply module, configured to receive the second electric energy or the third electric energy, and stop receiving the second electric energy when receiving the second parallel signal.

2. The dual power supply circuit according to claim 1, wherein the first power supply module comprises a first power supply, a first capacitor, a first voltage stabilizer, a first resistor, a first potentiometer, a second capacitor and a first diode; and the second power supply module comprises a second power supply, an adjustable voltage stabilization device and a second diode. The first power supply connects one end of the first capacitor and the IN end of the first voltage stabilizer, the OUT end of the first voltage stabilizer connects the anode of the first diode and one end of the second capacitor and the ADJ end of the first voltage stabilizer through the first resistor and one end of the first potentiometer, the first end of the second power supply connects the input end of the controllable voltage stabilizing device, the output end of the controllable voltage stabilizing device connects the anode of the second diode, the cathode of the second diode connects the second output module, the second end of the second power supply connects the second end of the first power supply, the other end of the first capacitor, the ground end of the adjustable voltage stabilizing device, the other end of the first potentiometer, the wiper end of the first potentiometer, the other end of the second capacitor and the ground end, and the cathode of the first diode connects the first output module.

3. The dual power supply circuit according to claim 2, wherein The first output module comprises a third resistor, a third power tube, a second switch tube, a fourth resistor and a first output port; The drain of the third power tube connects the cathode of the first diode and the gate of the third power tube and the collector of the second switch tube through the third resistor, the source of the third power tube connects the first end of the first output port, the base of the second switch tube connects the first end of the fourth resistor, the second end of the fourth resistor connects the first control module, and the emitter of the second switch tube connects the second end of the first output port and the ground end.

4. The dual power supply circuit according to claim 3, wherein The second output module comprises a seventh resistor, a fourth power tube, a fourth switch tube, a sixth resistor and a second output port; The drain of the fourth power tube connects the cathode of the second diode and the gate of the fourth power tube and the collector of the fourth switch tube through the seventh resistor, the gate of the fourth power tube connects the first end of the second output port, the second end of the second output port connects the emitter of the fourth switch tube and the ground end, the base of the fourth switch tube connects the first end of the sixth resistor, and the second end of the sixth resistor connects the second control module.

5. The dual power supply circuit of claim 4, wherein the first and second DC-DC converters are connected in series. The first control module comprises a second resistor, a first key switch, a first logic chip and a first switch tube; the parallel power supply module comprises a first power tube and a second power tube; One end of the second resistor connects the drain of the first power tube and the cathode of the first diode, the other end of the second resistor connects the static end of the first key switch, the dynamic end of the first key switch connects the collector of the first switch tube and the B end of the first logic chip, the emitter of the first switch tube is grounded, the A end of the first logic chip connects the output detection module, the Y end of the first logic chip connects the second end of the fourth resistor and the gate of the first power tube, the source of the first power tube connects the source of the second power tube, the drain of the second power tube connects the cathode of the second diode, and the gate of the second power tube connects the second control module.

6. The dual power supply circuit of claim 5, wherein, The second control module comprises a second logic chip, a fifth resistor, a second key switch and a third switch tube; The Y end of the second logic chip is connected with the gate of the second power tube and the second end of the sixth resistor, the A end of the second logic chip is connected with the output detection module, the B end of the second logic chip is connected with the moving end of the second key switch, the base of the first switch tube and the collector of the third switch tube, the base of the third switch tube is connected with the collector of the first switch tube, the emitter of the third switch tube is grounded, and the static end of the second key switch is connected with the cathode of the second diode through the fifth resistor.

7. The dual power supply circuit according to claim 6, wherein The output detection module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first comparator, a second comparator and a first inverter; The noninverting end of the first comparator is connected with the inverting end of the second comparator and one end of the eighth resistor and grounded through the ninth resistor, the inverting end of the first comparator is connected with the noninverting end of the second comparator and one end of the tenth resistor and grounded through the eleventh resistor, the other end of the eighth resistor and the other end of the tenth resistor are respectively connected with the OUT end of the first voltage stabilizer and the output end of the adjustable voltage stabilizing device, the output end of the first comparator is connected with the output end of the second comparator and the input end of the first inverter, and the output end of the first inverter is connected with the A end of the first logic chip and the A end of the second logic chip.

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