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Power circuit

A power supply circuit and circuit technology, applied in electrical components, regulating electrical variables, instruments, etc., can solve the problems of not considering the temperature drift and parameter discreteness of other devices, unadjustable temperature compensation parameters, and inability to withstand high voltage input. Modular design and optimization, large input voltage fluctuation range, good independence and the effect of flexibility

Active Publication Date: 2011-11-16
XIAN TIANZHAO WEICHENG ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compensation circuit assumes that the compensation tube T3 and the feedback amplifier tube T2 can have exactly the same temperature characteristics in a wide temperature range, or that the forward temperature drift characteristics of the diodes D1, D2, and D3 are completely different from the reverse temperature drift characteristics. On the contrary, so as to achieve the effect of mutual cancellation; but generally it is difficult to find a completely matching tube, the circuit does not consider the temperature drift and parameter dispersion of other devices, it is difficult to achieve accurate compensation for high temperature environment changes and device dispersion
[0007]Use an integrated operational amplifier for error feedback amplification. Although working at room temperature can improve the sensitivity of output adjustment, the parameters of temperature compensation cannot be adjusted, and its accuracy is still limited.
In addition, limited to the current technological level, the input voltage of integrated operational amplifiers generally does not exceed 30V ~ 40V, and cannot withstand high voltage input of up to hundreds of volts; the high temperature working range that can be adapted is basically between -40°C and 85°C , when the temperature is higher than 85 ℃ ~ 125 ℃, not only the cost is expensive, but also the temperature drift is very serious, and the temperature is higher than 150 ℃, it will be difficult to work stably

Method used

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Embodiment 1

[0136] In this embodiment, the structure of the power supply circuit is as follows Figure 2b As shown, the RTD adopts Pt1000 (zero-degree resistance 1k ohms), and the adjustable parameter constant current source adopts Figure 3a , Figure 3b The two structures, and use the variable resistor R0 to adjust the current I0. Figure 3a It is based on the JFET structure, because the reverse saturation conduction current I0=Idss of the JFET is relatively small, generally around tens of uA to several mA, when the amplification factor of the adjustment tube T1 is relatively large (such as using Darlington Tube), can realize low power consumption design; Figure 3b Based on the structure of the transistor, the current I0 is adjusted by the resistor R0, and the range can be tens of uA to tens of mA, which can directly realize the driving of the high-power tube T1. JFET can also be replaced by VMOS tube to achieve the same low power consumption and high power driving effect, but becau...

Embodiment 2

[0147] In this embodiment, the structure of the power supply circuit is as follows Figure 6a As shown, the difference between embodiment two and embodiment one is mainly:

[0148] NPN tube T1 is used to bias the ground to drive PNP tube T3 as a voltage adjustment circuit to achieve a low dropout (within 1.0V) and low output voltage (about 2.4V) structure, and greatly reduce the base current I1 of T1 to constant The diversion effect of the flow source I0;

[0149] Among them, the temperature compensation Rt1 for Vref adopts Pt100 with a smaller resistance value (zero-degree resistance 100 ohms);

[0150] If the power consumption is too large, or the temperature compensation range of Rt is not enough, the output sampling voltage divider resistors R1 and R2 (that is, the bias resistor Rt2 of T2) also use PTC or NTC thermistors for further compensation to improve the power supply. Accuracy and temperature adaptation range.

[0151] The production and debugging process of the p...

Embodiment 3

[0153] In this embodiment, the structure of the power supply circuit is as follows Figure 6b As shown, it can be considered that the corresponding Figure 2b The T1 adopts the structure of a Darlington tube, and the difference between the third embodiment and the first embodiment is mainly:

[0154] Figure 6b NPN tube T1 is used to bias the output terminal and PNP (or IGBT) tube T3 is used as a voltage adjustment circuit to achieve low power consumption (power consumption mainly depends on I0 of the adjustable parameter constant current source) and low output voltage structure. And greatly reduce the shunting effect of the base current I1 of T1 on the constant current source I0;

[0155] Among them, the temperature compensation Rt1 for Vref adopts Pt1000 with a larger resistance value (zero-degree resistance 1k ohm);

[0156] The voltage dividing resistors R1 and R2 for output sampling (that is, the bias resistor of T2) are also further compensated by PTC or NTC thermisto...

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Abstract

The invention discloses a power circuit, which comprises a parameter-adjustable constant current source, a voltage regulation circuit, a feedback amplification circuit, a temperature compensation and control circuit, an output voltage sampling circuit and a filtering circuit, wherein the parameter-adjustable constant current source is used for driving the voltage regulation circuit, the feedback amplification circuit and the temperature compensation and control circuit; the feedback amplification circuit is used for performing feedback amplification on an output error; the temperature compensation and control circuit is used for generating a reference voltage changed along with temperature to compensate temperature drift; and the output voltage sampling circuit is used for dividing the output voltage, generating a feedback sampling voltage and providing the feedback sampling voltage for the feedback amplification circuit. The power circuit provided by the invention can perform negative feedback regulation on the fluctuation of the output voltage and the temperature drift, thereby simultaneously achieving the effects of automatic temperature compensation and automatic voltage stabilization and easily achieving high temperature resistance, high voltage resistance and high power, and is suitable for application occasions with a wide input voltage fluctuation range, high output power, high stability and low temperature drift in a high temperature environment.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a power supply circuit. Background technique [0002] As the scope of exploration and development of oil and gas fields further expands to harsh environments such as deep underground areas, beach seas, and deep seas, in order to accurately and effectively complete exploration, well completion, production, and reservoir data collection, the work in high temperature, high pressure, and strong corrosion The module design and overall performance of downhole tools in such extreme environments will pose new challenges and requirements. Among them, the high-quality high-temperature-resistant regulated power supply module is often the basis for realizing high-performance downhole measuring instruments and data acquisition systems. It not only directly affects the life, accuracy, sensitivity and reliability of the equipment, but also directly determines the instrument's Production c...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 韦雄观黄建宁王克军
Owner XIAN TIANZHAO WEICHENG ELECTRIC