Large-voltage large-current output circuit

Abstract

The utility model discloses a large-voltage large-current output circuit, and aims to solve the problems of distortion in a small signal amplification process and inflexible adjustment of large-voltage large-current output in the prior art. The technical scheme provided by the utility model is that the large-voltage large-current output circuit comprises a signal source used for outputting a first path of signals and a second path of signals; the input end of the high-voltage output unit is connected with the first-path output end of the signal source, and the high-voltage output unit is used for converting the first-path signal into high voltage and outputting the high voltage; and the input end of the large-current output unit is connected with the second-path output end of the signal source, and the large-current output unit is used for converting the second-path signal into large current and outputting the large current. According to the circuit, a topological structure and parameter design are adopted, the problem of distortion in the small signal amplification process is solved, and independent adjustment of large voltage and large current is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a high-voltage and high-current output circuit. Background Art

[0002] In power grid applications, amplifying small signal voltage and current into large signal voltage and current is a common requirement. Traditional amplification methods usually use active devices such as triodes or MOS tubes to achieve signal amplification. However, these methods have some inherent limitations that affect amplification performance and efficiency.

[0003] As active devices, triodes and MOS tubes have their own frequency response limitations. When the frequency of the input signal is high, the gain of these devices will drop significantly, resulting in poor amplification performance and failure to meet the requirements of high-frequency applications. In addition, triodes and MOS tubes are nonlinear devices, which will introduce nonlinear distortion during the amplification process, causing distortion of the output signal and affecting the quality and accuracy of the signal.

[0004] In addition to performance limitations, the use of active devices for amplification also has the problem of high power consumption and low efficiency. Active devices consume a certain amount of power when working, which increases the power consumption of the entire amplifier circuit and reduces the energy efficiency of the system.

[0005] In order to overcome the above problems, some solutions propose to use transformers as amplifiers. Transformers are passive devices, not limited by frequency response, and do not introduce nonlinear distortion, which can provide better amplification performance. However, there are certain shortcomings in using transformers alone for amplification. The amplification factor of the transformer is usually fixed, and the adjustment flexibility is insufficient, making it difficult to achieve precise control of the amplification factor and unable to meet the needs of different application scenarios.

[0006] In summary, the traditional amplification method has some limitations in power grid application, such as frequency response limitation, nonlinear distortion, high power consumption, etc. Although the use of transformers for amplification can overcome some of these problems, the adjustment flexibility is insufficient and it is difficult to achieve precise control. Utility Model Content

[0007] The utility model aims to provide a high voltage and high current output circuit to solve the problems in the prior art that a small signal is easily distorted when outputting a high voltage and a high current, and the amplification multiple is not accurately controlled.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A high voltage and high current output circuit comprises a signal source, a high voltage output unit and a high current output unit; the signal source is used to output a first signal and a second signal; the input end of the high voltage output unit is connected to the first output end of the signal source, and is used to convert the first signal into a high voltage output; the input end of the high current output unit is connected to the second output end of the signal source, and is used to convert the second signal into a high current output.

[0010] The circuit divides the signal source into two output paths, which are connected to the high voltage output unit and the high current output unit respectively, thereby realizing independent control of the high voltage and high current outputs, avoiding mutual influence, and improving the output accuracy and stability.

[0011] Preferably, the high voltage output is 30-100V, and the high current output is 5-20A.

[0012] The output performance indicators of the circuit are clarified. The high voltage output of 30-100V and the high current output of 5-20A can meet the needs of various application scenarios, such as industrial control, power electronics and other fields.

[0013] Preferably, the signal source is a DAC chip, more preferably a DAC81408 chip.

[0014] The specific model of the signal source is specified. The DAC81408 chip is a high-precision, low-noise DAC chip that can provide stable and reliable signal output, ensuring the performance of the entire circuit.

[0015] Preferably, the first signal and the second signal are both small signals of 0-5V.

[0016] The signal range of the signal source output is clarified. The small signal of 0-5V is compatible with common signal processing circuits, has good versatility, and is easy to connect and integrate with other circuits.

[0017] Preferably, the high voltage output unit includes a voltage follower and a first transformer; the input end of the voltage follower is connected to the first output end of the signal source, the primary winding of the first transformer is connected to the output end of the voltage follower, and the secondary winding is used to output the high voltage.

[0018] The circuit structure of the high voltage output unit is described in detail. The voltage follower is used to isolate the signal source and the first transformer to avoid the source end load effect. The transformer is used to amplify the voltage. The two cooperate to achieve stable and reliable high voltage output.

[0019] Preferably, the transformation ratio of the first transformer is 3-10:50-200, the input voltage of the primary winding is 0-10V, and the output voltage of the secondary winding is 0-200V.

[0020] The specific parameters of the transformer are given, the transformation ratio is 3-10:50-200, the input voltage of the primary winding is 0-10V, which matches the output of the signal source, and the output voltage of the secondary winding is 0-200V, which can obtain the required 30-100V high voltage output.

[0021] Preferably, the high current output unit includes an amplifying unit, a transformer and an internal resistor; the input end of the amplifying unit is connected to the second output end of the signal source, the primary winding of the second transformer is connected to the output end of the amplifying unit, and the internal resistor is connected to the secondary winding of the second transformer.

[0022] The circuit structure of the high-current output unit is described in detail. The amplification unit is used to amplify the small signal to a suitable amplitude, the second transformer is used to realize the conversion from voltage to current, and the internal resistance is used for current limiting and current detection. The cooperation of the three realizes stable and reliable high-current output.

[0023] Preferably, the amplification unit comprises an operational amplifier and a power amplifier connected in sequence, the operational amplifier has an amplification factor of 1-5 times, the power amplifier has an amplification factor of 1-5 times, and the total amplification factor of the two after cascading is 1-25 times.

[0024] The circuit structure and amplification factor of the amplification unit are described in detail. The operational amplifier and the power amplifier are connected in sequence, providing 1-5 times amplification respectively, and the total amplification factor is 1-25 times. It can amplify the small signal of 0-5V to 0-125V, meeting the input requirements of the primary winding of the second transformer.

[0025] Preferably, the transformation ratio of the second transformer is 10-50:1, the input voltage of the primary winding is 0-50V, and the output voltage of the secondary winding is 0-2.5V; the resistance of the internal resistor is 10-100mΩ, which is used to convert the voltage of 0-2.5V into the current output of 0-20A.

[0026] The specific parameters of the second transformer and internal resistance are given. The transformation ratio of the second transformer is 10-50:1, the input voltage of the primary winding is 0-50V, which matches the output of the amplification unit, and the output voltage of the secondary winding is 0-2.5V; the resistance of the internal resistance is 10-100mΩ. According to Ohm's law, the voltage of 0-2.5V can be converted into a current output of 0-20A, achieving the required large current output.

[0027] The beneficial effects of the utility model are:

[0028] The high voltage and high current output circuit integrates high voltage output and high current output in one circuit, and has the advantages of simple structure, low cost and high efficiency. By using a transformer as an amplifier, the frequency response limitation and nonlinear distortion problems that may exist in traditional active devices are avoided, and the stability and reliability of the amplification performance are improved.

[0029] The circuit adopts a multi-stage amplification architecture, using operational amplifiers and power amplifiers to amplify the input signal step by step, and then realizes voltage-current conversion through transformers and internal resistance, achieving precise control of output voltage and current. Compared with the solution of using transformers alone for amplification, this circuit has stronger adjustment flexibility and can meet the requirements of output voltage and current in different application scenarios.

[0030] In terms of output performance, the circuit's maximum voltage output can reach 30-100V, and its maximum current output can reach 0-20A, which can meet the needs of high voltage and high power loads, such as applications in industrial control, power electronics and other fields.

[0031] The input signal of the circuit is a small signal of 0-5V, which is compatible with common signal processing circuits and has good versatility and applicability. This makes it easy to connect the circuit to existing control systems and signal sources, simplifying the system design and integration process.

[0032] In summary, this high voltage and high current output circuit provides a solution with good performance and flexible use. It integrates high voltage output and high current output, uses transformers to achieve amplification, and avoids the limitations of active devices. The multi-stage amplification architecture and precise voltage and current control capabilities enable it to meet the needs of various application scenarios. At the same time, the characteristics of small signal input make it very versatile and applicable. This circuit has application value in industrial control, power electronics and other fields, and provides an option for achieving efficient and reliable high-power power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a functional module diagram of a high voltage and high current output circuit in one embodiment of the utility model;

[0034] picture 2 This is a principle block diagram of a high voltage and high current output circuit in one embodiment of the utility model. DETAILED DESCRIPTION

[0035] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only used to explain the technical principles of the utility model, rather than to limit its protection scope. Those skilled in the art should understand that, without departing from the spirit and scope of the utility model, these embodiments can be subjected to various transformations, modifications or equivalent substitutions. These transformations, modifications or equivalent substitutions should all be deemed to fall within the protection scope defined by the claims of the utility model.

[0036] In the present invention, large voltage and large current are relative to the small signal output by the signal source. Specifically, the large voltage output unit in the present invention can convert the small signal of 0-5V output by the signal source into a high voltage output of 30-100V. This 30-100V voltage is a large voltage relative to the 0-5V signal source output; and the large current output unit can convert the small signal of 0-5V output by the signal source into a large current output of 5-20A. This 5-20A current is a large current relative to the voltage output of the signal source. The large voltage and large current in the present invention are relative concepts, and their specific numerical ranges can be adjusted according to actual application requirements. By introducing a large voltage output unit and a large current output unit, the present invention can convert the small signal of the signal source into a large voltage and large current output to meet the needs of some special applications.

[0037] like Figure 1 As shown, the high voltage and high current output circuit in one embodiment of the utility model mainly includes a signal source, a high voltage output unit and a high current output unit. Among them, the signal source (not shown in the figure) outputs two AC0-5V output signals, the first signal is connected to the high voltage output unit, and the second signal is connected to the high current output unit. The signal source adopts this dual-output structure, which can realize independent control of high voltage and high current output, and improve the flexibility of the circuit.

[0038] The large voltage output unit is composed of a voltage follower unit and a transformer unit, and is used to convert the first small signal of the signal source into a large voltage output. The voltage follower unit plays the role of impedance matching and signal buffering to ensure the effective transmission of the signal. The transformer unit realizes the voltage increase and boosts the signal output by the voltage follower to the required large voltage range. In this embodiment, the large voltage output unit can convert a small signal of 0-5V into a large voltage output of 50-100V. It should be noted that 50-100V is only a preferred voltage output range. In actual applications, the transformation ratio of the transformer can be adjusted according to demand to achieve different voltage output ranges.

[0039] The high current output unit is composed of an operational amplifier unit, a power amplifier unit, a transformer unit and an internal resistor (not shown in the figure), and is used to convert the second small signal of the signal source into a high current output. The operational amplifier unit and the power amplifier unit jointly provide the required current amplification factor to amplify the small signal to a sufficiently large current magnitude. The transformer unit converts the amplified voltage signal into a current signal. The internal resistor is used to limit the maximum output current and plays a role in overcurrent protection. In this embodiment, the setting of the internal resistor makes the maximum output current of the high current output unit 10A. It should also be noted that 10A is only a preferred value. In the actual circuit, the maximum output current can be changed by adjusting the resistance value of the internal resistor to meet different application requirements.

[0040] like Figure 2 As shown, a high voltage and high current output circuit in one embodiment of the utility model includes a signal source, a high voltage output unit and a high current output unit. Figure 2 As shown, the upper part of the circuit is an isolated power supply module, which is mainly composed of DC-DC converters and linear regulator chips such as MAX25201, LT3081, LT3045, etc. Its function is to provide a stable, low-noise, isolated power supply for the high-voltage and high-current output circuit in the lower part, which will not be elaborated here.

[0041] The signal source uses a DAC chip, which has two output terminals, which output a first signal and a second signal respectively, and the voltage range is 0-5V. The DAC chip is a high-precision, low-noise digital-to-analog conversion chip that can provide stable and reliable signal output, ensuring the performance of the entire circuit. At the same time, the 0-5V small signal output is compatible with common signal processing circuits and has good versatility. Preferably, the DAC chip is a DAC81408 chip.

[0042] The input end of the large voltage output unit is connected to the first output end of the DAC chip, and is used to convert the 0-5V small signal into a 30-100V large voltage output, preferably, a 57.5V large voltage output. Specifically, the large voltage output unit includes a voltage follower and a transformer. The voltage follower uses an operational amplifier, preferably an OP07C operational amplifier, and its input end is connected to the first output end of the DAC chip, which plays the role of impedance matching and current amplification. The use of the voltage follower can effectively isolate the signal source and the transformer, avoid the source end load effect, and improve the stability of the circuit. The primary winding of the transformer is connected to the output end of the voltage follower, and the secondary winding is connected to the output end. The transformation ratio is 3-10:50-200, preferably 5:100, and the 0-5V input signal can be amplified to an output voltage of 0-200V, preferably, an output voltage of 0-100V. The use of the transformer realizes efficient voltage amplification, and the selection of the transformation ratio matches the output of the signal source and the required large voltage output.

[0043] The input end of the large current output unit is connected to the second output end of the DAC chip, and is used to convert a small signal of 0-5V into a large current output of 5-20A, preferably, a large current output of 10A. Specifically, the large current output unit includes an amplification unit, a transformer and an internal resistor (not shown in the figure). The amplification unit includes an operational amplifier and a power amplifier. Preferably, the operational amplifier uses an OPA445 high-voltage and high-current operational amplifier, whose input end is connected to the second output end of the DAC chip, and whose output end is connected to the input end of the power amplifier. The amplification factors of the operational amplifier and the power amplifier are both 1-5 times, preferably, both 2 times. The series connection of the operational amplifier and the power amplifier can amplify the small signal to a suitable amplitude and provide sufficient driving capacity for the operation of the transformer. The primary winding of the transformer is connected to the output end of the power amplifier, and the secondary winding is connected to the internal resistor. Its transformation ratio is 10-50:1, preferably 20:1, and the input signal of 0-50V can be stepped down to 0-2.5V, preferably, the input signal of 0-20V can be stepped down to 0-1V. The use of the transformer realizes efficient conversion from voltage to current, and the selection of the transformation ratio matches the output of the amplification unit. The resistance value of the internal resistor is 10-100mΩ, preferably 50mΩ; according to Ohm's law, a maximum current output of 5-20A can be achieved, preferably a maximum current output of 10A can be achieved, ensuring the safety and reliability of the circuit. The use of the internal resistor can also realize current detection and feedback control, further improving the stability and accuracy of the circuit.

[0044] To sum up, the high-voltage and high-current output circuit provided in this embodiment outputs two 0-5V small signals through the DAC chip, which are transformed and amplified by a high-voltage output unit with an operational amplifier as the core and a high-current output unit with an operational amplifier and a power amplifier as the core, respectively, to finally achieve a high-voltage output of 30-100V and a high-current output of up to 5-20A. Preferably, a high-voltage output of 57.5V and a high-current output of up to 10A are achieved, and the two can be adjusted independently.

[0045] In the high voltage output unit, the voltage follower is used for impedance matching and current amplification, and the transformer is used for voltage amplification, converting the 0-5V input signal into an output voltage of 0-200V, preferably, into an output voltage of 0-100V, and after processing, a stable high voltage output of 30-100V is obtained, preferably, a stable high voltage output of 57.5V is obtained. In the high current output unit, the operational amplifier and the power amplifier are used for signal amplification, the transformer is used for voltage-to-current conversion, and the internal resistance is used for current limiting, and finally a stable high current output of 5-20A at maximum is obtained, preferably, a stable high current output of 10A at maximum is obtained.

[0046] The circuit has a simple structure and low cost. It adopts a certain topological structure and parameter design to overcome the distortion problem in the process of small signal amplification and ensure the quality and stability of the output signal. The high voltage and high current output circuit can be applied to high power control occasions in the fields of industrial automation, power electronics, robots, etc. It can provide stable and reliable high voltage and high current output to meet the power supply requirements of different loads. It also has the ability to adjust independently, is flexible and convenient to use, and is expected to achieve good results in practical applications.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high voltage and high current output circuit, characterized in that: include: A signal source, used for outputting a first signal and a second signal; A high voltage output unit, whose input end is connected to the first output end of the signal source, and is used to convert the first signal into a high voltage output; A high current output unit, whose input end is connected to the second output end of the signal source, is used to convert the second signal into a high current output.

2. The high voltage and high current output circuit according to claim 1, characterized in that: The high voltage output is 30-100V.

3. The high voltage and high current output circuit according to claim 1, characterized in that: The high current output is 5-20A.

4. The high voltage and high current output circuit according to claim 1, characterized in that: The signal source is a DAC chip.

5. The high voltage and high current output circuit according to claim 1, characterized in that: The first signal and the second signal are both small signals of 0-5V.

6. The high voltage and high current output circuit according to claim 1, characterized in that: The high voltage output unit comprises: A voltage follower, whose input end is connected to the first output end of the signal source; The first transformer has a primary winding connected to the output end of the voltage follower and a secondary winding for outputting the large voltage.

7. The high voltage and high current output circuit according to claim 6, characterized in that: The transformation ratio of the first transformer is 3-10:50-200, the input voltage of the primary winding is 0-5V, and the output voltage of the secondary winding is 0-200V.

8. The high voltage and high current output circuit according to claim 1, characterized in that: The high current output unit comprises: an amplifying unit, the input end of which is connected to the second output end of the signal source; A second transformer, a primary winding of which is connected to the output end of the amplifying unit; An internal resistance is connected to the secondary winding of the transformer.

9. The high voltage and high current output circuit according to claim 8, characterized in that: The amplification unit comprises an operational amplifier and a power amplifier connected in sequence, the operational amplifier has an amplification factor of 1-5 times, the power amplifier has an amplification factor of 1-5 times, and the total amplification factor of the two after cascading is 1-25 times.

10. The high voltage and high current output circuit according to claim 8, characterized in that: The transformation ratio of the second transformer is 10-50:1, the input voltage of the primary winding is 0-50V, and the output voltage of the secondary winding is 0-2.5V; the resistance of the internal resistor is 10-100mΩ, which is used to convert the voltage of 0-2.5V into the current output of 0-20A.

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