Digital adjustable power supply control circuit capable of adjusting from 0V

Abstract

The invention provides a digital adjustable power supply control circuit capable of adjusting from 0V, which comprises a power supply, an internal voltage-stabilizing power supply circuit, an adjustable positive voltage generation circuit, a negative voltage generation circuit and an adjustable voltage output main control circuit, and is characterized in that the power supply is in power supply connection with the internal voltage-stabilizing power supply circuit and the negative voltage generation circuit; the output end of the internal voltage stabilization power supply circuit is connected with the input end of the adjustable positive voltage generation circuit, the output end of the adjustable positive voltage generation circuit and the output end of the negative voltage generation circuit are connected with the input end of the adjustable voltage output main control circuit, and the output end of the adjustable voltage output main control circuit can be connected with electric equipment. The input end of the adjustable positive voltage generation circuit can receive a control signal of external software. The digital adjustable power supply has the beneficial effects that the digital adjustable power supply can be digitally adjusted from 0V, the desired voltage can be conveniently adjusted and output in real time, and the circuit structure is simple.

Description

Technical Field

[0001] The invention relates to the field of circuit technology, and in particular to a digital adjustable power supply control circuit capable of adjusting from 0V. Background Art

[0002] As a common power supply, adjustable power supply is often used in circuits. Compared with fixed power supply, adjustable power supply has the flexibility of adjustable voltage and can better meet the power supply needs of various circuits.

[0003] In the prior art, conventional adjustable power supplies are generally separate devices that cannot be integrated into the user's circuit. Instead, they are used as additional separate power supply devices, which will occupy additional usage area, and the user experience is not good enough. In the prior art, there are also adjustable power supplies that use adjustable resistors in conjunction with DCDC buck-boost circuits, but this type of adjustable power supply must manually adjust the adjustable resistor to adjust the voltage, and cannot be digitally adjusted by software control. At the same time, due to the feedback voltage principle of the DCDC buck circuit, it is also impossible to start adjusting from 0V, and the user experience is not good enough. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention provides a digitally adjustable power supply control circuit capable of being adjusted from 0V. By arranging a power supply, an internal voltage-stabilizing power supply circuit, an adjustable positive voltage generating circuit, a negative voltage generating circuit and an adjustable voltage output main control circuit that cooperate with each other in the digitally adjustable power supply control circuit capable of being adjusted from 0V, the adjustable power supply can be digitally adjustable, and the adjustable power supply can be adjusted from 0V, so as to facilitate real-time adjustment of the desired output voltage. The circuit structure is simple, and the problems in the prior art that the adjustable power supply is generally a separate power supply device with a large volume and inconvenient to use, and the voltage cannot be adjusted from 0V using an adjustable resistor in combination with a DCDC buck-boost circuit, and the use experience is not good enough are solved.

[0005] The present invention provides a digital adjustable power supply control circuit capable of adjusting from 0V, comprising a power supply, an internal voltage-stabilized power supply circuit, an adjustable positive voltage generating circuit, a negative voltage generating circuit and an adjustable voltage output main control circuit, wherein the power supply is connected to the internal voltage-stabilized power supply circuit and the negative voltage generating circuit for power supply, the output end of the internal voltage-stabilized power supply circuit is connected to the input end of the adjustable positive voltage generating circuit, the output end of the adjustable positive voltage generating circuit and the output end of the negative voltage generating circuit are connected to the input end of the adjustable voltage output main control circuit, the output end of the adjustable voltage output main control circuit can be connected to an electrical device, the input end of the adjustable positive voltage generating circuit can receive a control signal from external software, and the adjustable positive voltage generating circuit can adjust the positive voltage provided to the adjustable voltage output main control circuit according to the control signal from the external software, thereby adjusting the voltage value finally outputted to the electrical device by the adjustable voltage output main control circuit.

[0006] The present invention is further improved, the internal voltage-stabilized power supply circuit is provided with a three-terminal adjustable voltage-stabilizing tube D1, a resistor R4, a resistor R5 and a resistor R6, wherein the three-terminal adjustable voltage-stabilizing tube D1 is provided with 3 pins, the first pin of the three-terminal adjustable voltage-stabilizing tube D1 is connected to one end of the resistor R4, one end of the resistor R5, and the input end of the adjustable positive voltage generating circuit, the other end of the resistor R4 is connected to the power supply, the second pin of the three-terminal adjustable voltage-stabilizing tube D1 is connected to the other end of the resistor R5 and one end of the resistor R6, and the other end of the resistor R6 and the third pin of the three-terminal adjustable voltage-stabilizing tube D1 are grounded.

[0007] The present invention is further improved, the adjustable positive voltage generating circuit is provided with a positive voltage generating chip U3, a capacitor C13 and a capacitor C14, wherein the positive voltage generating chip U3 is provided with 6 pins, the first pin of the positive voltage generating chip U3 is connected to one end of the capacitor C13 and the input end of the adjustable voltage output main control circuit, the third pin of the positive voltage generating chip U3 is connected to one end of the capacitor C14 and the first pin of the three-terminal adjustable voltage regulator D1, the fourth and fifth pins of the positive voltage generating chip U3 can receive control signals from external software, and the other end of the capacitor C13 and the other end of the capacitor C14 are grounded.

[0008] The present invention is further improved, the negative voltage generating circuit is provided with a negative voltage generating chip U2 and an inductor L1, wherein the negative voltage generating chip U2 is provided with 12 pins, the 12th pin of the negative voltage generating chip U2 is connected to the power supply, the 8th pin of the negative voltage generating chip U2 is connected to one end of the inductor L1, and the 7th pin of the negative voltage generating chip U2 is connected to the other end of the inductor L1 and the input end of the adjustable voltage output main control circuit.

[0009] The present invention is further improved, the adjustable voltage output main control circuit is provided with a main control chip U5, an output chip U4, a resistor R8, a resistor R7, a capacitor C19 and a resistor R10, wherein the main control chip U5 is provided with 8 pins, the output chip U4 is provided with 3 pins, the second pin of the main control chip U5 is connected to the first pin of the positive voltage generating chip U3 through the resistor R8, the fourth pin of the main control chip U5 is connected to one end of the capacitor C19 and the seventh pin of the negative voltage generating chip U2, the sixth pin of the main control chip U5 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the first pin of the output chip U4 and one end of the resistor R7, the other end of the resistor R7 is connected to the second pin of the output chip U4, the second pin of the output chip U4 can also be connected to an electrical device, and the other end of the capacitor C19 is grounded.

[0010] The present invention is further improved, the model of the positive voltage generating chip U3 is DAC7571, the model of the negative voltage generating chip U2 is TPS63710, the model of the main control chip U5 is TL971IDR, and the model of the output chip U4 is LM350T.

[0011] The present invention is further improved in that the resistance value of the resistor R10 is 240Ω, and the resistance value of the resistor R7 is 120Ω.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: a digital adjustable power supply control circuit capable of being adjusted from 0V is provided, and a power supply, an internal voltage-stabilizing power supply circuit, an adjustable positive voltage generating circuit, a negative voltage generating circuit and an adjustable voltage output main control circuit that cooperate with each other are arranged in the digital adjustable power supply control circuit capable of being adjusted from 0V. The adjustable positive voltage generating circuit can adjust the positive voltage provided to the adjustable voltage output main control circuit according to the control signal of the external software, and then adjust the voltage value finally outputted by the adjustable voltage output main control circuit to the electrical equipment. The external software controls the adjustable positive voltage generating circuit to output a specified voltage, and finally the adjustable power supply can be digitally adjustable, and the adjustable power supply can be adjusted from 0V, so as to facilitate real-time adjustment of the desired voltage outputted by the entire circuit. The circuit structure is simple, and the problems in the prior art that the adjustable power supply is generally a separate power supply device with a large volume, inconvenient to use, the voltage cannot be adjusted from 0V using an adjustable resistor in combination with a DCDC buck-boost circuit, and the use experience is not good enough are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 The present invention is a principle block diagram of a digital adjustable power supply control circuit capable of adjusting from 0V;

[0015] Figure 2 A circuit diagram of an internal voltage-stabilized power supply circuit of the present invention;

[0016] Figure 3 A circuit diagram of an adjustable positive voltage generating circuit of the present invention;

[0017] Figure 4 A circuit diagram of a negative voltage generating circuit of the present invention;

[0018] Figure 5 It is a circuit diagram of the adjustable voltage output main control circuit of the present invention. DETAILED DESCRIPTION

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0022] like Figure 1-Figure 5As shown, the present invention provides a digital adjustable power supply control circuit that can be adjusted from 0V, including a power supply, an internal voltage-stabilized power supply circuit, an adjustable positive voltage generating circuit, a negative voltage generating circuit and an adjustable voltage output main control circuit, the power supply is connected to the internal voltage-stabilized power supply circuit and the negative voltage generating circuit, the output end of the internal voltage-stabilized power supply circuit is connected to the input end of the adjustable positive voltage generating circuit, the output end of the adjustable positive voltage generating circuit and the output end of the negative voltage generating circuit are connected to the input end of the adjustable voltage output main control circuit, the output end of the adjustable voltage output main control circuit can be connected to the power-consuming device, and the input end of the adjustable positive voltage generating circuit can receive the control signal of the external software. In this embodiment, the adjustable positive voltage generating circuit can adjust the positive voltage provided to the adjustable voltage output main control circuit according to the control signal of the external software, and then adjust the voltage value finally output by the adjustable voltage output main control circuit to the power-consuming device, and the external software controls the adjustable positive voltage generating circuit to output a specified voltage through I2C bus communication, and finally realizes the digital adjustment of the adjustable power supply, and also realizes the adjustment of the adjustable power supply from 0V, which is convenient for real-time adjustment of the desired voltage output of the entire circuit, and the circuit structure is simple.

[0023] like Figure 2 As shown, the internal voltage-stabilized power supply circuit is provided with a three-terminal adjustable voltage-stabilizing tube D1, a resistor R4, a resistor R5 and a resistor R6, wherein the three-terminal adjustable voltage-stabilizing tube D1 is provided with 3 pins, the first pin of the three-terminal adjustable voltage-stabilizing tube D1 is connected to one end of the resistor R4, one end of the resistor R5 and the input end of the adjustable positive voltage generating circuit, the other end of the resistor R4 is connected to the power supply, the second pin of the three-terminal adjustable voltage-stabilizing tube D1 is connected to the other end of the resistor R5 and one end of the resistor R6, and the other end of the resistor R6 and the third pin of the three-terminal adjustable voltage-stabilizing tube D1 are grounded. In this embodiment, the internal voltage-stabilized power supply circuit is used to provide a stable 4.1V operating voltage for the adjustable positive voltage generating circuit.

[0024] like Figure 3 As shown, the adjustable positive voltage generating circuit is provided with a positive voltage generating chip U3, a capacitor C13 and a capacitor C14, wherein the model of the positive voltage generating chip U3 is DAC7571, and the positive voltage generating chip U3 is provided with 6 pins, the first pin of the positive voltage generating chip U3 is connected to one end of the capacitor C13 and the input end of the adjustable voltage output main control circuit, the third pin of the positive voltage generating chip U3 is connected to one end of the capacitor C14 and the first pin of the three-terminal adjustable voltage regulator D1, the fourth and fifth pins of the positive voltage generating chip U3 can receive control signals from external software, and the other end of the capacitor C13 and the other end of the capacitor C14 are grounded. In this embodiment, the adjustable positive voltage generating circuit is used to provide an adjustable positive voltage for the adjustable voltage output main control circuit.

[0025] like Figure 4As shown, the negative voltage generating circuit is provided with a negative voltage generating chip U2 and an inductor L1, wherein the model of the negative voltage generating chip U2 is TPS63710, and the negative voltage generating chip U2 is provided with 12 pins, the 12th pin of the negative voltage generating chip U2 is connected to the power supply, the 8th pin of the negative voltage generating chip U2 is connected to one end of the inductor L1, and the 7th pin of the negative voltage generating chip U2 is connected to the other end of the inductor L1 and the input end of the adjustable voltage output main control circuit. In this embodiment, the negatively adjusted positive voltage generating circuit is used to provide a negative voltage for the adjustable voltage output main control circuit, so as to facilitate the adjustment of the final output voltage of the adjustable voltage output main control circuit from 0V.

[0026] like Figure 5 As shown, the adjustable voltage output main control circuit is provided with a main control chip U5, an output chip U4, a resistor R8, a resistor R7, a capacitor C19 and a resistor R10, wherein the model of the main control chip U5 is TL971IDR, the model of the output chip U4 is LM350T, the main control chip U5 is provided with 8 pins, the output chip U4 is provided with 3 pins, the second pin of the main control chip U5 is connected to the first pin of the positive voltage generating chip U3 through the resistor R8, the fourth pin of the main control chip U5 is connected to one end of the capacitor C19 and the seventh pin of the negative voltage generating chip U2, the sixth pin of the main control chip U5 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the first pin of the output chip U4 and one end of the resistor R7, the other end of the resistor R7 is connected to the second pin of the output chip U4, the second pin of the output chip U4 can also be connected to an electrical device, the other end of the capacitor C19 is grounded, the resistance value of the resistor R10 is 240Ω, and the resistance value of the resistor R7 is 120Ω. In this embodiment, the adjustable voltage output main control circuit is used to output the final voltage value to the electrical equipment according to the voltage provided by the positive voltage generation circuit and the negative voltage generation circuit. The function of the main control chip U5 is to obtain a negative voltage ADJ_OUT as large as DAC_OUT, and then apply ADJ_OUT to the low-voltage end of the output chip U4 (LDO). Then, the final output voltage VOUT of the output chip U4 is ADJ_OUT+1.25V*(R10 / R7+1), that is, VOUT=3.75V-DAC_OUT. In this way, the external software only needs to adjust the DAC_OUT voltage output by the adjustable positive voltage generation circuit to the main control chip U5 through the I2C bus communication, which can ensure that the final output voltage VOUT of the output chip U4 is a digital adjustable voltage starting from 0V.

[0027] As can be seen from the above, the present invention provides a digital adjustable power supply control circuit that can be adjusted from 0V. By arranging a power supply, an internal voltage-stabilizing power supply circuit, an adjustable positive voltage generating circuit, a negative voltage generating circuit and an adjustable voltage output main control circuit that cooperate with each other in the digital adjustable power supply control circuit that can be adjusted from 0V, the adjustable positive voltage generating circuit can adjust the positive voltage provided to the adjustable voltage output main control circuit according to the control signal of the external software, and then adjust the voltage value finally output by the adjustable voltage output main control circuit to the power-consuming device. The external software controls the adjustable positive voltage generating circuit to output a specified voltage, and finally the adjustable power supply can be digitally adjustable, and the adjustable power supply can be adjusted from 0V, which is convenient for real-time adjustment of the desired voltage output of the entire circuit. The circuit structure is simple, which solves the problems in the prior art that the adjustable power supply is generally a separate power supply device with a large volume, inconvenient to use, the voltage cannot be adjusted from 0V using an adjustable resistor in combination with a DCDC buck-boost circuit, and the use experience is not good enough.

[0028] The specific implementation modes described above are preferred implementation modes of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific implementation modes, and all equivalent changes made according to the present invention are within the protection scope of the present invention.

Claims

1. A digital adjustable power supply control circuit capable of adjusting from 0V, characterized in that: It includes a power supply, an internal voltage-stabilized power supply circuit, an adjustable positive voltage generating circuit, a negative voltage generating circuit and an adjustable voltage output main control circuit. The power supply is connected to the internal voltage-stabilized power supply circuit and the negative voltage generating circuit for power supply. The output end of the internal voltage-stabilized power supply circuit is connected to the input end of the adjustable positive voltage generating circuit. The output end of the adjustable positive voltage generating circuit and the output end of the negative voltage generating circuit are connected to the input end of the adjustable voltage output main control circuit. The output end of the adjustable voltage output main control circuit can be connected to an electrical device. The input end of the adjustable positive voltage generating circuit can receive a control signal from external software. The adjustable positive voltage generating circuit can adjust the positive voltage provided to the adjustable voltage output main control circuit according to the control signal from the external software, thereby adjusting the voltage value finally output by the adjustable voltage output main control circuit to the electrical device.

2. The digital adjustable power control circuit capable of adjusting from 0V according to claim 1, characterized in that: The internal voltage-stabilized power supply circuit is provided with a three-terminal adjustable voltage-stabilizing tube D1, a resistor R4, a resistor R5 and a resistor R6, wherein the three-terminal adjustable voltage-stabilizing tube D1 is provided with 3 pins, the first pin of the three-terminal adjustable voltage-stabilizing tube D1 is connected to one end of the resistor R4, one end of the resistor R5 and the input end of the adjustable positive voltage generating circuit, the other end of the resistor R4 is connected to the power supply, the second pin of the three-terminal adjustable voltage-stabilizing tube D1 is connected to the other end of the resistor R5 and one end of the resistor R6, and the other end of the resistor R6 and the third pin of the three-terminal adjustable voltage-stabilizing tube D1 are grounded.

3. The digital adjustable power control circuit capable of adjusting from 0V according to claim 2, characterized in that: The adjustable positive voltage generating circuit is provided with a positive voltage generating chip U3, a capacitor C13 and a capacitor C14, wherein the positive voltage generating chip U3 is provided with 6 pins, the first pin of the positive voltage generating chip U3 is connected to one end of the capacitor C13 and the input end of the adjustable voltage output main control circuit, the third pin of the positive voltage generating chip U3 is connected to one end of the capacitor C14 and the first pin of the three-terminal adjustable voltage regulator D1, the fourth and fifth pins of the positive voltage generating chip U3 can receive control signals from external software, and the other end of the capacitor C13 and the other end of the capacitor C14 are grounded.

4. The digital adjustable power control circuit capable of adjusting from 0V according to claim 3, characterized in that: The negative voltage generating circuit is provided with a negative voltage generating chip U2 and an inductor L1, wherein the negative voltage generating chip U2 is provided with 12 pins, the 12th pin of the negative voltage generating chip U2 is connected to the power supply, the 8th pin of the negative voltage generating chip U2 is connected to one end of the inductor L1, and the 7th pin of the negative voltage generating chip U2 is connected to the other end of the inductor L1 and the input end of the adjustable voltage output main control circuit.

5. The digital adjustable power control circuit capable of adjusting from 0V according to claim 4, characterized in that: The adjustable voltage output main control circuit is provided with a main control chip U5, an output chip U4, a resistor R8, a resistor R7, a capacitor C19 and a resistor R10, wherein the main control chip U5 is provided with 8 pins, the output chip U4 is provided with 3 pins, the second pin of the main control chip U5 is connected to the first pin of the positive voltage generating chip U3 through the resistor R8, the fourth pin of the main control chip U5 is connected to one end of the capacitor C19 and the seventh pin of the negative voltage generating chip U2, the sixth pin of the main control chip U5 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the first pin of the output chip U4 and one end of the resistor R7, the other end of the resistor R7 is connected to the second pin of the output chip U4, the second pin of the output chip U4 can also be connected to an electrical device, and the other end of the capacitor C19 is grounded.

6. The digital adjustable power control circuit capable of adjusting from 0V according to claim 5, characterized in that: The model of the positive voltage generating chip U3 is DAC7571, the model of the negative voltage generating chip U2 is TPS63710, the model of the main control chip U5 is TL971IDR, and the model of the output chip U4 is LM350T.

7. The digital adjustable power control circuit capable of adjusting from 0V according to claim 6, characterized in that: The resistance value of the resistor R10 is 240Ω, and the resistance value of the resistor R7 is 120Ω.

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