Circuit capable of converting single power supply into dual power supplies and having current expansion function

Abstract

The utility model provides a circuit for converting a single power supply into double power supplies with current expansion, which comprises a voltage division circuit, an operation following circuit and an output circuit, the voltage division circuit is connected with the operation following circuit, the operation following circuit is connected with the output circuit, the voltage is divided under the action of a first resistor and a second resistor in the voltage division circuit, and the output circuit is connected with the output circuit. After voltage division, the voltage flows through the operational amplifier and then reaches the first triode and the second triode, a collector of the second triode is connected with a first grounding end, a stable reference point can be provided for the circuit, and the voltage reaches the first capacitor and the second capacitor through the first triode and the second triode; the first capacitor is connected with the emitter of the first triode to form a second output end, the second output end is connected with the negative electrode of the operational amplifier to form an operational follower, the structure is simple, and the circuit stability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, and particularly relates to a single - power - to - dual - power circuit with current boosting. Background Art

[0002] With the development of production and the progress of technology, the scenarios of applying dual - power supplies are becoming more and more extensive. Especially in audio applications, dual - power - supply power can significantly improve the signal - processing quality. Therefore, the reliability of converting a single - power supply to a dual - power supply is crucial. In the prior art, the voltage filtering and voltage stabilization of the single - power - to - dual - power circuit are cumbersome and repetitive, the current boosting and amplification performance is unstable, and problems of unstable operation occur, affecting the stability and reliability of the circuit.

[0003] For example, in the patent document with the patent application number CN201720495267.1 and the publication date of December 1, 2017, a single - power - to - dual - voltage circuit is disclosed, which includes a voltage - stabilizing circuit. The voltage - stabilizing circuit is connected to a filtering circuit, the filtering circuit is connected to an operational - amplification circuit, the operational - amplification circuit is connected to a follower circuit, and the follower circuit is connected to a protection circuit. Among them, the voltage - stabilizing circuit and the filtering circuit optimize the input voltage. The operational - amplification circuit and the follower circuit together achieve the purpose of converting a single - power supply to a dual - power supply. The protection circuit protects the entire circuit. The principle used is the unidirectional conductivity of the diode. The negative electrode of the first diode is connected to the positive - voltage output terminal, and the positive electrode of the second diode is connected to the negative - voltage output terminal.

[0004] In the above - mentioned literature, the voltage is processed by the voltage - stabilizing circuit and the filtering circuit and reaches the operational - amplification circuit. The input - end voltage is connected to the negative - input terminal of the operational amplifier, which will cause the output terminal of the operational amplifier to affect the input - end voltage. In addition, the voltage at the output terminal of the operational amplifier is directly fed back to the negative input terminal, so when the voltage at the output terminal of the operational amplifier is unstable, it will affect the accuracy of the output voltage of the entire operational amplifier. In addition, since the power - supply terminal of the operational amplifier is directly connected to the output dual - power supply, and the power supply at the output terminal may have fluctuations, this will cause the entire operational amplifier to work unstably. Summary of the Invention

[0005] The utility model provides a single - power - to - dual - power circuit with current boosting. By performing voltage stabilization and filtering processing on the voltage in the operational - follower circuit and performing current boosting processing on the current, the circuit has good stability and a simple structure.

[0006] To achieve the above object, the technical solution of the present utility model is: a single - power - to - dual - power circuit with current boosting, including an operational follower circuit and an output circuit. The operational follower circuit is connected to the output circuit, and further includes a voltage - dividing circuit. The voltage - dividing circuit is connected to the operational follower circuit. The voltage - dividing circuit includes a first resistor, a second resistor, and a power supply. The operational follower circuit includes an operational amplifier, a first triode, a second triode, a first capacitor, and a second capacitor. The positive input terminal of the operational amplifier is connected to the power supply through one end of the first resistor. The power supply terminal of the operational amplifier is respectively connected to the power supply and grounded. The bases of the first triode and the second triode are respectively connected to the output terminal of the operational amplifier. The collector of the first triode is connected to the power supply. After the emitters of the first triode and the second triode are connected, they are respectively connected to the other end of the first capacitor and one end of the second capacitor and then connected to the second output terminal. The negative input terminal of the operational amplifier is connected to the second output terminal. One end of the first capacitor is connected to the power supply and also connected to the first output terminal. The other end of the second capacitor and the other end of the second resistor are grounded. The other end of the second capacitor is externally connected to the third output terminal. One end of the second resistor is connected to the other end of the first resistor. The first output terminal, the second output terminal, and the third output terminal are connected to the output circuit.

[0007] With the above settings, the power supply completes voltage division under the action of the series - connected first resistor and second resistor in the voltage - dividing circuit. After voltage division, the voltage flows through the operational amplifier and then reaches the first triode and the second triode. At this time, the first triode and the second triode amplify the current. When the circuit has overload or short - circuit, the first triode and the second triode can quickly enter the cut - off state, cutting off the current path, thereby protecting the circuit from damage. The collector of the second triode is connected to the first grounding terminal, which can provide a stable reference point for the circuit, effectively prevent voltage counter - attack, and also optimize the current amplification performance, thereby improving the stability and reliability of the circuit. The voltage reaches the first capacitor and the second capacitor after passing through the first triode and the second triode. The first capacitor and the second capacitor can store charges to smooth the voltage fluctuation, making the voltage in the circuit more stable and playing a filtering role. After passing through the first capacitor and the second capacitor, the corresponding output voltage is fed back to the negative input terminal of the operational amplifier, thereby ensuring the stability of the negative - feedback signal input to the operational amplifier. In addition, the operational amplifier is connected to the positive - feedback terminal through the divided voltage. Since the power supply is a stable external power supply, the stability of the input power supply input to the operational amplifier is ensured. At the same time, the operational follower circuit is connected to the output circuit through the output terminal, and the power supply terminal of the operational amplifier is directly connected to the stable external power supply, thereby ensuring that the operational amplifier works more reliably.

[0008] Further, the output circuit includes a first terminal, a second terminal, a third terminal, a third resistor, a fourth resistor, and a second grounding terminal. The first terminal is connected to the first output terminal. One end of the third resistor is connected to the first terminal, and the other end of the third resistor is connected to the second terminal. One end of the second terminal is connected to the second output terminal, and the other end of the second terminal is connected to the second grounding terminal. One end of the fourth resistor is connected to the second terminal, and the other end of the fourth resistor is connected to the third terminal. The third terminal is connected to the third output terminal.

[0009] With the above arrangement, the first terminal, the second terminal, and the third terminal are provided in the output circuit, facilitating connection to the voltage follower circuit. At the same time, a third resistor is connected between the first terminal and the second terminal, and a fourth resistor is provided between the second terminal and the third terminal, ensuring the stability of the output voltage.

[0010] Further, both the first capacitor and the second capacitor are polarized capacitors.

[0011] With the above arrangement, by providing polarized capacitors, on the one hand, it can filter the voltages on the first output terminal and the second output terminal, and on the other hand, it can also ensure the polarization setting on the first output terminal and the second output terminal.

[0012] Further, the first triode Q1 is an NPN triode, and the second triode Q2 is a PNP triode.

[0013] With the above arrangement, through the type setting of the first triode Q1 and the second triode Q2, the two triodes form an amplifying switch circuit, which can amplify the current and also disconnect when the value exceeds the reference value.

[0014] Further, the voltage dividing circuit and the operational follower circuit are provided at one end of the circuit board, and the output circuit is provided at the other end of the circuit board.

[0015] With the above arrangement, by setting the operational follower circuit, the voltage dividing circuit, and the output circuit in different regions on the circuit board, it can prevent the influence of the input power signal fluctuation on the output voltage.

[0016] Further, the first output terminal, the second output terminal, and the third output terminal are respectively connected to the first terminal, the second terminal, and the third terminal through external wires.

[0017] With the above arrangement, connection can be achieved between the operational follower circuit and the output circuit through external wires, facilitating the circuit board layout.

[0018] Further, a first output power interface is connected to one end of the third resistor, and a second output power interface is connected to the other end of the fourth resistor.

[0019] With the above settings, it is convenient for the external circuit to be connected to the two output power supplies through the interface. Description of the Drawings

[0020] Figure 1 This is the circuit diagram of the present utility model.

[0021] Description of the reference numerals in the drawings:

[0022] 1 - First output terminal; 2 - Second output terminal; 3 - Third output terminal; 4 - First wiring terminal; 5 - Second wiring terminal; 6 - Third wiring terminal. Detailed Description of the Preferred Embodiment

[0023] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Figure 1 As shown, a single - power - to - dual - power circuit with current boosting includes a voltage - dividing circuit, an operational follower circuit, and an output circuit. The voltage - dividing circuit is connected to the operational follower circuit, and the operational follower circuit is connected to the output circuit. The voltage - dividing circuit includes a first resistor R1 and a first resistor R2. The operational follower circuit includes an operational amplifier U1, a first triode Q1, a second triode Q2, a first capacitor C1, and a second capacitor C2. The positive power supply terminal of the operational amplifier U1 is connected to the power supply VCC, the negative power supply terminal of the operational amplifier U1 is grounded. The bases of the first triode Q1 and the second triode Q2 are respectively connected to the output terminal of the operational amplifier U1. The collector of the first triode Q1 is connected to the power supply VCC, the emitter of the first triode Q1 is connected to the emitter of the second triode Q2. One end of the first capacitor C1 is connected to the power supply VCC and then connected to the first output terminal 1, and the other end of the first capacitor C1 is connected to the emitter of the first triode Q1 and then connected to the second output terminal 2;

[0025] One end of the first resistor R2 is connected to one end of the first resistor R1 and the positive input terminal of the operational amplifier U1, and the other end of the first resistor R2 is connected to the collector of the second triode Q2. The collector of the second triode Q2 is grounded. One end of the second capacitor C2 is connected to the second output terminal 2, and the other end of the second capacitor C2 is connected to the collector of the second triode Q2 and then connected to the third output terminal 3. The negative input terminal of the operational amplifier U1 is connected to the second output terminal 2;

[0026] The power supply VCC is connected to one end of the first resistor R1. One end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the collector of the second triode Q2 and the other end of the second capacitor C2 and is grounded.

[0027] The output circuit includes a first terminal 4, a second terminal 5, a third terminal 6, a third resistor R3, a fourth resistor R4, and a second ground terminal. The first terminal 4 is connected to the first output terminal 1. One end of the third resistor R3 is connected to the first terminal 4 and provides a first output power supply V1. The other end of the third resistor R3 is connected to the second terminal 5. One end of the second terminal 5 is connected to the second output terminal 2, and the other end of the second terminal 5 is connected to the second ground terminal. One end of the fourth resistor R4 is connected to the second terminal 5, and the other end of the fourth resistor R4 is connected to the third terminal 6 and provides a second output power supply V2. The third terminal 6 is connected to the third output terminal 3.

[0028] In the voltage dividing circuit, the first power supply is divided by the first resistor R1 and the first resistor R2. After voltage division, the voltage flows through the operational amplifier U1 and is compared with the second power supply, and then amplified and reaches the first triode Q1 and the second triode Q2. At this time, the first triode Q1 and the second triode Q2 perform current amplification processing. When there is overload or short circuit in the input terminal circuit of the operational amplifier, the output terminal of the operational amplifier U1 approaches zero, and the first triode Q1 and the second triode Q2 can quickly enter the cut-off state, cutting off the current path, thereby protecting the circuit from damage. The collector of the second triode Q2 is connected to the first ground terminal, which can provide a stable reference point for the circuit, effectively prevent voltage counterattack, and optimize the current amplification performance, thereby improving the stability and reliability of the circuit. The voltage passes through the first triode Q1 and the second triode Q2 and reaches the first capacitor C1 and the second capacitor C2. The first capacitor C1 and the second capacitor C2 can store charges to smooth the voltage fluctuation, making the voltage in the circuit more stable and playing a filtering role. The first capacitor C1 is connected to the emitter of the first triode Q1 to form the second output terminal 2. The output terminal of the operational amplifier U1 after amplification and filtering is connected to the negative terminal of the operational amplifier U1 to form an operational follower, so that the voltage at the second output terminal is consistent with the voltage at the positive input terminal of the operational amplifier U1. Since the voltages at the first output terminal and the second output terminal are stable at a voltage value, when the second output terminal in the output circuit is grounded, in order to ensure that the voltage difference between the first terminal and the second terminal remains unchanged, the first terminal is stabilized at a voltage value. In this embodiment, the power supply VCC is 15V, the first output power supply V1 and the second output power supply V2 are stable at plus or minus 7.5V, the resistance values of the first resistor R1 and the second resistor R2 are equal, the resistance values of the third resistor R3 and the fourth resistor R4 are equal, and the capacitance values of the first capacitor C1 and the second capacitor C2 are equal, so that the single power supply of 15V is converted into a plus or minus 7.5V dual power supply output.

[0029] The first resistor R1 and the first resistor R2 are connected in series, and the first capacitor C1 and the second capacitor C2 are connected in series. The voltage-dividing circuit is connected in series with a resistor across the voltage source. By using the principle that different voltages are distributed across different resistors and appropriately selecting the values of the two resistors, the purpose of obtaining a smaller voltage from a larger voltage is achieved. The series connection of the first capacitor C1 and the second capacitor C2 can effectively suppress instantaneous interference signals and protect the operational amplifier U1 to work properly.

[0030] The first resistor R1 and the first resistor R2 mainly divide the voltage. The operational amplifier U1 mainly stabilizes the voltage. The first triode Q1 and the second triode Q2 mainly play the roles of current boosting and protecting the circuit. The first capacitor C1 and the second capacitor C2 mainly play a filtering role to stabilize the working state of the operational amplifier U1. The third resistor R3 and the fourth resistor R4 divide the voltage in the output circuit, forming a first loop with a positive voltage output and a second loop with a negative voltage output.

[0031] The voltage-dividing circuit and the operational amplifier follower circuit are arranged on one side of the circuit board (not shown in the figure), and the output circuit is arranged on the other side of the circuit board. The first output terminal and the first connection terminal are electrically connected through a pluggable external wire, the second output terminal and the second connection terminal are electrically connected through a pluggable external wire, and the third output terminal and the third connection terminal are electrically connected through a pluggable external wire, so that it is convenient to layout the circuit and at the same time prevent the influence between the output power supply and the input power supply.

[0032] Working principle of the present utility model: Voltage division is completed under the action of the first resistor R1 and the first resistor R2 in the voltage division circuit. After voltage division, the voltage flows through the operational amplifier U1 and then reaches the first triode and the second triode Q2. At this time, the first triode and the second triode Q2 amplify the current. When the circuit has overload or short circuit, the first triode and the second triode Q2 can quickly enter the cut-off state to cut off the current path, thereby protecting the circuit from damage. The collector of the second triode Q2 is connected to the first grounding terminal, which can provide a stable reference point for the circuit, effectively prevent voltage counterattack, and also optimize the current amplification performance, thereby improving the stability and reliability of the circuit. The voltage reaches the first capacitor C1 and the second capacitor C2 through the first triode and the second triode Q2. The first capacitor C1 and the second capacitor C2 can store charges to smooth the voltage fluctuation, making the voltage in the circuit more stable and playing a filtering role. The first capacitor C1 is connected to the emitter of the first triode Q1 to form the second output terminal 2, and the second output terminal 2 is connected to the negative pole of the operational amplifier U1 to form an operational follower, so that the voltage difference between the two circuit parts is stable. Then, it is grounded through the second output terminal, thereby ensuring that the voltage between the first output terminal and the second output terminal is stable at two voltage values, thus realizing the function from a single power supply to a dual power supply. At the same time, negative feedback realizes high input impedance and low output impedance. The high input impedance reduces its influence on the voltage division circuit, thereby reducing the load of the power supply; the low output impedance can drive the output circuit to provide a stable voltage output. The structure is simple, the circuit is reliable and stable, and the service life is long.

Claims

1. A single - power - supply - to - dual - power - supply circuit with current boosting, comprising an operational follower circuit and an output circuit, the operational follower circuit being connected to the output circuit, characterized in that: It further includes a voltage dividing circuit, the voltage dividing circuit is connected to the operational follower circuit, the voltage dividing circuit includes a first resistor, a second resistor and a power supply, the operational follower circuit includes an operational amplifier, a first triode, a second triode, a first capacitor and a second capacitor. The positive input terminal of the operational amplifier is connected to the power supply through one end of the first resistor. The power supply terminal of the operational amplifier is respectively connected to the power supply and grounded. The bases of the first triode and the second triode are respectively connected to the output terminal of the operational amplifier. The collector of the first triode is connected to the power supply. After the emitters of the first triode and the second triode are connected, they are respectively connected to the other end of the first capacitor and one end of the second capacitor and connected to the second output terminal. The negative input terminal of the operational amplifier is connected to the second output terminal. One end of the first capacitor is connected to the power supply and connected to the first output terminal. The other end of the second capacitor and the other end of the second resistor are grounded. The other end of the second capacitor is externally connected to the third output terminal. One end of the second resistor is connected to the other end of the first resistor. The first output terminal, the second output terminal and the third output terminal are connected to the output circuit.

2. The single power supply to dual power supply circuit with current boosting according to claim 1, wherein: The output circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a third resistor, a fourth resistor and a second grounding terminal. The first connection terminal is connected to the first output terminal. One end of the third resistor is connected to the first connection terminal, and the other end of the third resistor is connected to the second connection terminal. One end of the second connection terminal is connected to the second output terminal, and the other end of the second connection terminal is connected to the second grounding terminal. One end of the fourth resistor is connected to the second connection terminal, and the other end of the fourth resistor is connected to the third connection terminal. The third connection terminal is connected to the third output terminal.

3. The dual-power circuit converted from a single power supply with current boosting according to claim 1, wherein: Both the first capacitor and the second capacitor are polarized capacitors.

4. The dual - power circuit converted from a single - power supply with current boosting according to claim 1, wherein: The first triode Q1 is an NPN triode, and the second triode Q2 is a PNP triode.

5. The dual-power circuit converted from a single power supply with current boosting according to claim 1, wherein: The voltage dividing circuit and the operational follower circuit are arranged at one end of the circuit board, and the output circuit is arranged at the other end of the circuit board.

6. The single power supply to dual power supply circuit with current boosting according to claim 2, characterized in that: The first output terminal, the second output terminal and the third output terminal are respectively connected to the first connection terminal, the second connection terminal and the third connection terminal through external wires.

7. The single power supply to dual power supply circuit with current boosting according to claim 2, wherein: One end of the third resistor is connected to a first output power supply interface, and the other end of the fourth resistor is connected to a second output power supply interface.

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