Voltage and current signal generating device
By using a high-power operation amplifier and a high-voltage op amp in the signal source device, combined with a feedback circuit and a variable resistor, the problems of cutoff distortion and large volume weight during current amplification of the signal source device in the prior art are solved, and high-quality signal output and low-cost and lightweight device design are realized.
Patent Information
- Application Number
- CN202421927193.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing signal source devices need to deal with cutoff distortion when current amplification, and the transformer boost results in large size, heavy weight, and high cost.
The output current and the output voltage of the high-voltage op amp are adopted to adjust the output through feedback circuits and variable resistances to avoid cutoff and saturation distortion, while reducing the device volume and weight.
High-quality output of the signal is achieved, cutoff and saturation distortion is avoided, and the device is small in size, light in weight and lower in cost.
Smart Images
Figure CN223051667U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a signal source device, in particular to a voltage and current source / signal generating device. Background Art
[0002] For the signal source devices currently on the market, most of their source currents use MOS transistors for amplification, and the voltage uses a transformer for boosting. Its advantages are: when the MOS transistor amplifies the current, its own loss is small, and the output voltage of the transformer boost can be controllably adjusted within a large range. The disadvantages are: when the MOS transistor amplifies, it is necessary to process at the zero crossing of the waveform to eliminate the cut-off distortion caused by the component itself, and the output voltage of the transformer boost will make the whole device large and heavy. As a signal source commonly used in the field of electronic appliances, it is required to have good signals, small size, and light weight, so as to increase the convenience of use and improve the product performance. Obviously, a signal source with lower cost and better signal quality is more conducive to its popularization and implementation. Content of the Utility Model
[0003] Aiming at the deficiencies of the prior art, the utility model provides a voltage and current signal generating device. Compared with the prior art, the signal will not appear cut-off or saturation distortion, and it has a small size, light weight, and lower cost of the solution.
[0004] Technical Solution of the Utility Model:
[0005] A voltage and current signal generating device includes a single-chip microcomputer three-phase small-signal output module, an amplification circuit module, and a control output module. The amplification circuit uses a high-power operational amplifier. The three-phase small-signal outputs of the single-chip microcomputer are respectively connected to the input ends of the high-power operational amplifier through operational amplifier followers. The output end of the high-power operational amplifier is connected to the control output module. At the same time, an output voltage or / and current signal detection circuit is provided at the output end of the operational amplifier, and the voltage or / and current signal detection circuit outputs a feedback signal and connects it to the I / O input end of the single-chip microcomputer of the single-chip microcomputer small-signal output module; a feedback resistor is connected between the output end and the inverting input end of the operational amplifier, and the non-inverting input end of the operational amplifier is connected to the reference signal input.
[0006] The voltage and current signal generating device includes a voltage output circuit. The voltage output circuit uses a PA88A series integrated circuit chip. Its input end is connected to the DA voltage output of the single-chip microcomputer, its output end is connected to the control output module, and at the same time, it is connected to the Cl port through a current-limiting resistor to form a signal acquisition and feedback module.
[0007] In the voltage and current signal generating device, the single-chip microcomputer DA voltage output circuit includes a DA current waveform output circuit to reduce the output impedance and improve the load-carrying capacity of the waveform; the DA current waveform output circuit uses MCP6004, and the offset AC output is adjusted by using the follower circuit of the operational amplifier.
[0008] The described voltage and current signal generating device includes a current output circuit. The current output circuit uses an OPA549T series integrated circuit chip. Its input terminal is connected to the DA voltage output of the single-chip microcomputer, and its output terminal is connected to the control output module. The output terminal is also connected to the Ref port and connected to the I-Lim port through a current-limiting resistor, forming a signal acquisition and feedback module.
[0009] The operational amplifier of the current output circuit adjusts the maximum allowable output current through the RLm resistor and eliminates the DC bias output by the single-chip microcomputer through a variable resistor; the operational amplifier of the current output circuit adjusts the maximum allowable output current through the Rcl resistor and eliminates the DC bias output by the single-chip microcomputer through a variable resistor.
[0010] Advantages of the utility model:
[0011] 1. The voltage and current signal generating device of the present utility model uses a high-power operational amplifier to output current and a high-voltage operational amplifier to output voltage. Compared with the prior art, the signal will not show cutoff or saturation distortion. When outputting voltage, only one high-voltage power supply is used to supply power to the operational amplifier, with a small volume, light weight, and lower cost of the solution.
[0012] 2. The voltage and current signal generating device of the present utility model has a relatively low requirement for current output in the voltage loop of the voltage output circuit. The maximum allowable output current is adjusted through the RLm resistor, and the DC bias output by the single-chip microcomputer is eliminated through a variable resistor. When zero adjustment is performed so that the single-chip microcomputer outputs "0V", the operational amplifier has no output.
[0013] 3. The voltage and current signal generating device of the present utility model has a relatively high requirement for current output in the current loop of the voltage output circuit. This method can avoid cutoff distortion in principle. To avoid saturation distortion, the maximum allowable output current is adjusted through the Rcl resistor to ensure that the output waveform does not exceed the line distortion and control the maximum output current to prevent overheating. The variable resistor eliminates the DC bias output by the single-chip microcomputer, and zero adjustment is performed so that when the single-chip microcomputer outputs "0V", the operational amplifier has no output.
[0014] 4. The voltage and current signal generating device of the present utility model uses the follower circuit of the operational amplifier for the single-chip microcomputer with biased AC output, reducing the output impedance and improving the load-carrying capacity of the waveform. Description of the drawings
[0015] Figure 1 The following shows the circuit principle block diagram of the voltage and current signal generating device of the present utility model;
[0016] Figure 2 The following shows the circuit schematic diagram of the voltage signal generating device;
[0017] Figure 3The circuit schematic diagram of the current signal generating device is shown;
[0018] Figure 4 The voltage output circuit schematic diagram of the voltage signal generating device of the present utility model is shown;
[0019] Figure 5 The DA current waveform output circuit of the voltage output circuit is shown;
[0020] Figure 6 The current output circuit schematic diagram of the current signal generating device of the present utility model is shown;
[0021] Figure 7 The output control circuit schematic diagram of the voltage and current signal generating device of the present utility model is shown. Specific embodiments
[0022] In order to make the technical concept and advantages for the utility model creation to achieve its utility model purpose clearer and more understandable, the technical solution of the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the following embodiments are only used to explain and illustrate the preferred embodiments of the present utility model, and should not constitute a limitation to the scope of protection of the present utility model patent claims.
[0023] Embodiment 1
[0024] See Figures 1-3 , the voltage and current signal generating device of the present utility model includes a single-chip microcomputer three-phase small-signal output module, an amplification circuit module, and a control output module. The amplification circuit module uses a high-power operational amplifier. The three-phase small-signal outputs of the single-chip microcomputer are respectively connected to the input ends of the high-power operational amplifier through operational amplifier followers. The output end of the high-power operational amplifier is connected to the control output module. At the same time, an output voltage or / and current signal detection circuit is provided at the output end of the operational amplifier. The voltage or / and current signal detection circuit outputs a feedback signal and connects it to the I / O input end of the single-chip microcomputer of the single-chip microcomputer small-signal output module; A feedback resistor is connected between the output end and the inverting input end of the operational amplifier, and the non-inverting input end of the operational amplifier is connected to the reference signal input.
[0025] The signal generating source of the present utility model, as Figure 2 shown, can be used as a voltage signal generating device and can be used as a current signal generating device, as Figure 3 shown; It can also have both Figure 2 , Figure 3 , and be used as a voltage and current signal generating device / signal source. It can be single-phase or three-phase. Figure 2 , Figure 3 Taking the single-phase as an example to illustrate the circuit principle.
[0026] The signal generator of the utility model has the following specific signal output process:
[0027] The single-chip microcomputer generates a three-phase AC small voltage signal with an adjustable phase difference of 120° and a DC bias. After being differentially amplified by a high-current power operational amplifier, a single-phase AC current of 5A is generated. (This module can perform current parallel output up to 40A). The current is sampled and fed back to the single-chip microcomputer to finely adjust and control the output 5A signal. (The sampling feedback is composed of a set of standard meters, which can display the output voltage and current and can also fine-tune the output). Finally, the output is controlled by the control module.
[0028] Embodiment 2
[0029] See Figure 2 , Figure 4 、 Figure 5 In this embodiment, the difference from Embodiment 1 is that further, the voltage and current signal generating device includes a voltage output circuit. The voltage output circuit uses a PA88A series integrated circuit chip. Its input terminal is connected to the DA voltage output of the single-chip microcomputer, and its output terminal is connected to the control output module. At the same time, it is connected to the Cl port through a current-limiting resistor to form a signal acquisition and feedback module. Among them, the single-chip microcomputer DA voltage output circuit includes a DA current waveform output circuit to reduce the output impedance and improve the load-carrying capacity of the waveform. The DA current waveform output circuit uses an MCP6004, and the follower circuit of the operational amplifier is used to adjust the bias AC output.
[0030] Embodiments 3 and 4
[0031] See Figure 3 、 Figure 6 In these two embodiments, the difference from Embodiment 1 and Embodiment 2 is that further, the voltage and current signal generating device includes a current output circuit. The current output circuit uses an OPA549T series integrated circuit chip. Its input terminal is connected to the DA voltage output of the single-chip microcomputer, and its output terminal is connected to the control output module. The output terminal is also connected to the Ref port and is connected to the I-Lim port through a current-limiting resistor to form a signal acquisition and feedback module.
[0032] The operational amplifier of the current output circuit adjusts the maximum allowable output current through the RLm resistor and eliminates the DC bias output by the single-chip microcomputer through a variable resistor. The operational amplifier of the current output circuit adjusts the maximum allowable output current through the Rcl resistor and eliminates the DC bias output by the single-chip microcomputer through a variable resistor.
[0033] The current loop of the signal source has relatively high requirements for current output. The current output circuit of the present utility model can avoid cut-off distortion in principle. To avoid saturation distortion, the maximum allowable output current is adjusted through the Rcl resistor and the output amplitude is controlled by software, ensuring that the output waveform does not exceed the line distortion while controlling the maximum output current to prevent overheating. The variable resistor is used to eliminate the DC bias output by the single-chip microcomputer and perform zero adjustment so that when the single-chip microcomputer outputs "0V", the operational amplifier has no output.
[0034] See Figure 7 , for the voltage and current signal generating device of the present utility model, the output control circuit adopts two-stage small current self-switching output control. Through 485 communication with the single-chip microcomputer, the output current can be adjusted to the specified accuracy of 0.2s level.
[0035] In the prior art, the source current uses MOS transistors for amplification and the voltage uses a transformer for boosting. Its advantages are that the MOS transistor has small self-loss when amplifying the current, and the transformer boosting can make the output voltage controllably adjustable within a large range. The disadvantages are that the MOS transistor amplification needs to process at the zero crossing point of the waveform to eliminate the cut-off distortion caused by the component itself, and the output voltage of the transformer boosting will make the whole device large and heavy.
[0036] Compared with the prior art, the present utility model uses a high-power operational amplifier to output current and a high-voltage operational amplifier to output voltage. Its advantages are that the signal will not show cut-off or saturation distortion, and only one high-voltage power supply is used to supply power to the operational amplifier when outputting voltage, with small volume and light weight, and the scheme cost is lower. To avoid saturation distortion, the maximum allowable output current is adjusted through the Rcl resistor, ensuring that the output waveform does not exceed the line distortion while controlling the maximum output current to prevent overheating. The variable resistor is used to eliminate the DC bias output by the single-chip microcomputer and perform zero adjustment so that when the single-chip microcomputer outputs "0V", the operational amplifier has no output. When controlling the output waveform, the resistance value is automatically switched according to the current, which can ensure that the output voltage of the operational amplifier is close to the power supply voltage, thereby reducing the heat dissipation loss of the operational amplifier.
[0037] The deficiency of the present utility model is that: when outputting voltage, due to the limitation of the power supply voltage of the operational amplifier, the maximum can reach 450V. If a higher voltage wants to be output, the transformer output scheme in the prior art still has to be used.
[0038] The above are only the preferred embodiments of the present utility model and do not constitute a limitation to the present utility model. Those skilled in the art can make other modifications to the implementation of the present utility model under the guidance of the prior art without creative labor. Any modification made within the spirit and principle of the present utility model or any simple replacement or equivalent replacement using the conventional technical means in the art shall be included in the protection scope of the present utility model.
Claims
1. A voltage and current signal generating device, comprising a single-chip microcomputer three-phase small signal output module, an amplifying circuit module and a control output module, characterized in that: The amplification circuit module adopts a high-power operational amplifier, and the three-phase small signal outputs of the single-chip microcomputer are respectively connected to the input ends of the high-power operational amplifier through operational amplifier followers. The output end of the high-power operational amplifier is connected to the control output module. At the same time, an output voltage and / or current signal detection circuit is provided at the output end of the operational amplifier. The voltage and / or current signal detection circuit outputs a feedback signal connected to the I / O input end of the single-chip microcomputer small signal output module; a feedback resistor is connected between the output end and the reverse input end of the operational amplifier, and the same-direction input end of the operational amplifier is connected to the reference signal input.
2. The voltage and current signal generating device according to claim 1, characterized in that: It includes a voltage output circuit, which adopts a PA88A series integrated circuit chip, whose input end is connected to the DA voltage output of the single-chip computer, and whose output end is connected to the control output module, and is connected to the Cl port through a current limiting resistor to form a signal acquisition feedback module.
3. The voltage and current signal generating device according to claim 2, characterized in that: The single-chip microcomputer DA voltage output circuit includes a DA current waveform output circuit to reduce the output impedance and improve the waveform's load capacity; the DA current waveform output circuit adopts MCP6004 and uses the follower circuit of the operational amplifier to adjust the bias AC output.
4. The voltage and current signal generating device according to claim 1, 2 or 3, characterized in that: It includes a current output circuit, which adopts an OPA549T series integrated circuit chip, whose input end is connected to the DA voltage output of the single-chip microcomputer, and whose output end is connected to the control output module. The output end is also connected to the Ref port and is connected to the I-Lim port through a current limiting resistor to form a signal acquisition feedback module.
5. The voltage and current signal generating device according to claim 4, characterized in that: The operational amplifier of the current output circuit adjusts the maximum current allowed to be output through the RLm resistor, and eliminates the DC bias of the microcontroller output through the variable resistor; the operational amplifier of the current output circuit adjusts the maximum current allowed to be output through the Rcl resistor, and eliminates the DC bias of the microcontroller output through the variable resistor.