A Downhole Stabilized Power Supply Switching Circuit with Hysteresis Characteristics
A technology of voltage stabilized power supply and switching circuit, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as abnormal operation of electrical loads, affecting the working performance of oil drilling tools, and fluctuations in DC power, and achieves protection work safe effect
Active Publication Date: 2017-01-11
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
However, in the process of starting and stopping the mud turbine generator, the output voltage has a process of rising and falling, so the DC power output by the stabilized power supply also has a process of rising and falling. If it directly supplies power to the load during this period , will affect the stability and safety of the load work due to insufficient load power supply
In addition, due to the large fluctuation of the mud flow, the speed of the mud turbine generator is unstable, and the change of the load may cause the oscillation and out-of-step of the mud turbine generator, which will lead to fluctuations in the DC power output by the stabilized power supply, causing Abnormal operation of electrical loads affects the overall performance of oil drilling tools
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[0020] The downhole stabilized power supply switching circuit with hysteresis characteristics provided by the present invention will be described in detail below with reference to the drawings and specific embodiments.
[0021] Such as figure 1 As shown, the downhole stabilized power supply switching circuit with hysteresis characteristics provided by the present invention includes:
[0022] The first resistor R1, the first end of the first resistor R1 is the input end of the circuit, and is used to receive the DC voltage output by the downhole stabilized power supply. The second end of the first resistor R1 is connected to the The second terminal of the comparator U1 is connected;
[0023] The second resistor R2, the first terminal of the second resistor R2 is connected to the second terminal of the comparator U1, the second terminal of the second resistor R2 is connected to the ground terminal, and the second terminal The resistor R2 and the first resistor R1 form a series voltage...
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The invention provides an underground stabilized power supply switch circuit having a retardation characteristic. The switch circuit comprises a first resistor R1, a second resistor R2, a capacitor C1, a comparator U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a power device Q1 and a diode D1. The beneficial effects are that in a power supplying system of a petroleum drilling tool, via the additional arrangement of a switch protection circuit between an underground stabilized power supply and power utilization load, safe work of the power utilization load can be effectively ensured during on and off of the system, and vibration and step out of a mud turbine generator; by arranging different on / off thresholds, a burn down problem caused by frequent on and off of a power device when the underground stabilized power output voltage is near the threshold voltage under the circumstance of one threshold value can be effectively avoided; and the switch circuit has important meanings for stable and safe operation of electronic control units in a petroleum drilling tool.
Description
Technical field [0001] The invention relates to a downhole stabilized power supply switch circuit for petroleum drilling tools, in particular to a downhole stabilized power supply switch circuit with hysteresis characteristics. Background technique [0002] Oil drilling tools with electronic control units mostly come from mud turbine generators. The three-phase low frequency AC power generated by the mud turbine generators is converted into stable DC power output suitable for different loads. However, during the start and stop of the mud turbine generator, the output voltage has a process of rising and falling. Therefore, the DC power output by the regulated power supply also has a process of rising and falling. If the load is directly supplied during this period of time , Will affect the stability and safety of the load due to insufficient power supply of the load. In addition, due to the large fluctuation of the mud flow, the mud turbine generator's speed is unstable, and the ...
Claims
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IPC IPC(8): G05F1/565
Inventor 李绍辉魏春明韩晓文郭佳白大鹏金平魏庆振张鑫
Owner BC P INC CHINA NAT PETROLEUM CORP