Safe power supply for oil field device

Abstract

The utility model belongs to the technical field of power supply, and particularly relates to a safe power supply for an oil field device, which comprises a photovoltaic panel, a capacitor boosting module, an energy storage switching module, a bidirectional DC-DC module, an energy storage battery pack, a power switch module and a DC-AC conversion module, the photovoltaic panel is connected with the capacitance boosting module; the energy storage switching module is connected with the capacitor boosting module, the bidirectional DC-DC module and the power switch module; the bidirectional DC-DC module is further connected with the energy storage battery pack and the power switch module, the power switch module is further connected with a DC-AC conversion module, and the capacitance boosting module comprises a first-stage capacity super capacitor, a boosting conversion circuit and a second-stage capacity super capacitor; the boost conversion circuit is arranged between the first-stage capacity super capacitor and the second-stage capacity super capacitor, so that low voltage and high voltage are isolated, the high voltage is prevented from being reversely charged to the small capacitor, and the safety and the stability of the power supply are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power supply technical field, concretely relates to a safe power supply power supply for oilfield device. BACKGROUND

[0002] For a long time, the electric energy of oilfield fracturing equipment is mainly supplied by the generator or the grid, and with the enhancement of environmental awareness, in the process of oil development, the green oil development theory emphasizes that while ensuring energy supply, the damage and pollution to the environment should be minimized. Using renewable and environmentally friendly energy to replace traditional and limited energy to replace the traditional power supply method has become one of the problems that must be solved in oilfield power supply.

[0003] At present, the application of solar power supply equipment can reduce the dependence on traditional energy such as oil, reduce energy consumption and carbon emissions in the process of oil development, and meet the requirements of green oil development theory, but the current solar power supply source has the phenomenon of reverse charging in the process of electric energy conversion, which makes the power supply voltage unstable and has safety hazards. SUMMARY

[0004] In order to solve the technical problems in the background art, the utility model provides a safe power supply power supply for oilfield device, which can help to avoid the reverse charging phenomenon in the process of electric energy conversion and improve the safety and stability of the power supply.

[0005] In order to realize the above technical scheme, the utility model provides a safe power supply power supply for oilfield device, which includes:

[0006] The utility model has the advantages of:

[0007] (1) the utility model capacitor boost module includes first level capacity super capacitor, boost conversion circuit and second level capacity super capacitor, through setting boost conversion circuit between first level capacity super capacitor and second level capacity super capacitor, realize low voltage and high voltage isolation, and prevent high voltage from charging small capacitor, so as to help to improve the safety and stability of the power supply.

[0008] (2) by setting bidirectional DC-DC module and energy storage battery pack, it is helpful to store the excess electric energy, and provide continuous and stable power support for the load in the case of insufficient solar energy conversion electric energy, which further helps to save resources.

[0009] (3) by setting overcurrent detection module, it is helpful to avoid the damage to the load caused by overcurrent, which further improves the safety of the power supply.

[0010] The advantages of the additional aspects of the present utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the present utility model, and are incorporated in and constitute a part of this specification. The embodiments of these drawings are shown to explain the present utility model, and do not constitute an improper limitation to the present utility model.

[0012] Figure 1 It is an electrical principle block diagram of the safety power supply for oil field device of the present utility model.

[0013] Figure 2 It is a circuit diagram of the capacitor boost module of the present utility model.

[0014] Figure 3 It is a circuit diagram of the bidirectional DC-DC module of the present utility model.

[0015] Figure 4 It is a circuit diagram of the overcurrent protection module of the present utility model.

[0016] 1-photovoltaic panel;2-capacitor boost module;3-energy storage switching module;4-bidirectional DC-DC module;5-power switch module;6-DC-AC conversion module;7-overcurrent protection module;8-energy storage battery pack. DETAILED DESCRIPTION

[0017] The present utility model will be further described below in combination with the drawings and embodiments.

[0018] It should be noted that the following detailed description is all exemplary, and is intended to provide further description of the present utility model. Unless otherwise specified, each technical and scientific term used in the present embodiment has the same meaning as that generally understood by ordinary maintenance personnel in the technical field to which the present utility model belongs.

[0019] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations exist.

[0020] In the utility model, the terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only the relationship words determined for the convenience of describing the structural relationship of the components or elements of the utility model, and are not specific to any component or element in the utility model, and cannot be understood as limiting the utility model.

[0021] In the utility model, the terms such as "fixedly connected", "connected", "connected" and the like should be understood in a broad sense, which means that it can be fixedly connected, integrally connected or detachably connected, and can be directly connected or indirectly connected through an intermediate medium. For the relevant scientific research or maintenance personnel in the field, the specific meaning of the above terms in the utility model can be determined according to the specific circumstances, and cannot be understood as limiting the utility model.

[0022] Embodiment 1:

[0023] The embodiment provides a safe power supply for oil field devices, which comprises a photovoltaic panel 1, a capacitor boosting module 2, an energy storage switching module 3, a bidirectional DC-DC module 4, an energy storage battery pack 8, a power switch module and a DC-AC conversion module 9. Figure 1

[0024] The photovoltaic panel 1 is used for collecting solar energy and converting the solar energy into electric energy; the capacitor boosting module 2 is used for multi-stage boosting treatment after the electric energy converted by the photovoltaic panel 1 is converged; the energy storage switching module 3 is connected with the capacitor boosting module 2, the bidirectional DC-DC module 4 and the power switch module 5, and is used for providing the boosted electric energy as input to the bidirectional DC-DC module 4 and the power switch module 5; the bidirectional DC-DC module 4 is also connected with the energy storage battery pack 8, so as to supply power for the energy storage battery pack 8 or provide the electric energy stored by the energy storage battery pack to the power switch module 5 through the energy storage switching module; the power switch module 5 is also connected with the DC-AC conversion module 6, and is used for converting the direct-current electric energy into alternating-current electric energy.

[0025] In the embodiment, the capacitor boosting module 2 comprises a first-stage capacity super capacitor, a boosting conversion circuit and a second-stage capacity super capacitor; the boosting conversion circuit is arranged between the first stage and the second stage, so as to realize low-voltage and high-voltage isolation and prevent high-voltage from being charged to a small capacitor, thereby helping to improve the safety and stability of the power supply.

[0026] Specifically, as shown in Figure 2 ​As shown, the capacitor boost module includes: a connector J1 for connecting to a photovoltaic panel; the first pin 1 of the connector J1 is connected to the first terminal of the first capacitor C1, the port Vin, port CTRL, and port SHDH of the boost converter chip U1, and the first terminal of the first inductor L1; the second pin 2 of the connector J1, the second terminal of the first capacitor C1, and the port GND of the boost converter chip U1 are grounded; the second terminal of the first inductor L1 is connected to the port SW of the boost converter chip U1; the port OUT of the boost converter chip U1 is connected to the first terminal of the third capacitor C3 and the first terminal of the first resistor R1; the port CAP of the boost converter chip U1 is connected to the second terminal of the third capacitor C3 and the first terminal of the second capacitor C2; the port FB of the boost converter chip U1 is connected to the second terminal of the first resistor R1 and the first terminal of the second resistor R2; the second terminal of the second capacitor C2 and the second terminal of the second resistor R2 are grounded.

[0027] The boost converter chip U1 uses the LT3464 boost converter chip, the first capacitor C1 serves as the first-stage small-capacity supercapacitor, and the third capacitor C3 serves as the second-stage high-capacity supercapacitor. The capacitor boost module can achieve boost conversion by adjusting the resistance values ​​of feedback resistors R1 and R2, thereby charging the second-stage high-capacity supercapacitor. The conversion relationship is as follows:

[0028]

[0029] like Figure 3 As shown, the bidirectional DC-DC module includes: a positive input terminal U1 and a negative input terminal U0 for connection to a capacitor boost module; the positive input terminal U1 is connected to the first terminal of the fourth capacitor C4, the collector of the first switching transistor Q1, and the negative terminal of the first diode; the negative input terminal U0 is connected to the second terminal of the fourth capacitor C4, the emitter of the second switching transistor, the anode of the second diode D2, the first terminal of the fifth capacitor C5, and the negative terminal of the energy storage battery pack; the emitter of the first switching transistor Q1 and the collector of the second switching transistor Q2 are connected to the first terminal of the second inductor L2; the bases of the first switching transistor Q1 and the second switching transistor Q2 are both connected to the energy storage switching module; the second terminal of the second inductor L2 is connected to the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the second terminal of the fifth capacitor C5 and the positive terminal of the energy storage battery pack.

[0030] The bidirectional DC-DC module, in use, through the first switching triode Q1, the first diode D1 and the second inductor L2, constitutes a step-down BUCK chopper conversion circuit, the energy storage switching circuit sends a control signal to the base of the first switching triode Q1, so that the first switching triode is turned on, and then the BUCK chopper conversion circuit is used to charge the energy storage battery pack, and through the second switching triode Q2, the second diode D2 and the second inductor L2, a step-up BOOST chopper conversion circuit is constituted, the energy storage switching circuit sends a control signal to the base of the first switching triode Q1, so that the second switching triode is turned on, and then the energy storage battery pack is discharged.

[0031] In one embodiment, the power switch module adopts a field effect tube switching circuit; the safety power supply for the oil field device further comprises an overcurrent protection module.

[0032] The overcurrent protection module is connected with the input end of the DC-AC conversion module, for detecting the current input into the DC-AC conversion module, and when the current overflows, the comparator outputs a high level signal to the central controller, and the central controller controls the field effect tube of the power switch module to be closed based on the received high level signal, so that the AC-DC conversion module stops working; when the fault is eliminated, the comparator outputs a low level signal, and the AC-DC conversion module automatically resumes work.

[0033] Specifically, as shown in Figure 4 The overcurrent protection module comprises: a fourth resistor R4, a first end of the fourth resistor R4 is connected with the input end (i.e. the overcurrent detection end) of the DC-AC conversion module; a second end of the fourth resistor R4 is connected with the positive electrode of a sixth capacitor C6, and a positive input pin 2 of a comparator U2; a negative input pin 3 of the comparator U2 is connected with a sliding contact of a sliding resistor Rp; a pin 8 of the comparator U2 and a first end of the sliding resistor Rp are connected with a power supply VCC1; a pin 4 and a pin 1 of the comparator U2, a second end of the sliding resistor Rp and a negative electrode of the sixth capacitor C6 are grounded; a output pin 7 of the comparator U2 is connected with a first end of a fifth resistor R5; a second end of the fifth resistor R5 is connected with a first end of a sixth resistor R6, a positive electrode of a seventh capacitor C7 and an output end OUT of the overcurrent protection module; a negative electrode of the seventh capacitor C7 is grounded; a second end of the sixth resistor R6 is connected with the power supply VCC1. Wherein, the comparator U2 adopts an LM311 comparator.

[0034] Wherein, the output end OUT is connected with a signal input end of the field effect tube switching circuit.

[0035] The above merely describes preferred embodiments of the present utility model and is not intended to limit the present utility model. For maintenance personnel in the field, the present utility model can be variously changed and varied. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A safe power supply for oilfield equipment, characterized in that, include: Photovoltaic panels, capacitor boost modules, energy storage switching modules, bidirectional DC-DC modules, energy storage battery packs, power switch modules, and DC-AC conversion modules; Photovoltaic panels are used to collect solar energy and convert it into electrical energy; a capacitor boost module is used to combine the DC power converted by the photovoltaic panels and then perform multi-stage voltage boosting; an energy storage switching module is connected to the capacitor boost module, the bidirectional DC-DC module, and the power switch module, and is used to provide the boosted electrical energy as input to the bidirectional DC-DC module and the power switch module; the bidirectional DC-DC module is also connected to the energy storage battery pack and the power switch module to power the energy storage battery pack or to discharge the electrical energy stored in the energy storage battery pack through the power switch module; the power switch module is also connected to a DC-AC conversion module to convert DC power into AC power; The capacitor boost module includes a first-stage supercapacitor, a boost converter circuit, and a second-stage supercapacitor.

2. The safe power supply for oilfield equipment according to claim 1, characterized in that, The capacitor boost module includes a connector J1 for connecting to a photovoltaic panel; the first pin 1 of connector J1 is connected to the first terminal of the first capacitor C1, the port Vin, port CTRL, and port SHDH of the boost converter chip U1, and the first terminal of the first inductor L1; the second pin 2 of connector J1, the second terminal of the first capacitor C1, and the port GND of the boost converter chip U1 are grounded; the second terminal of the first inductor L1 is connected to the port SW of the boost converter chip U1; the port OUT of the boost converter chip U1 is connected to the first terminal of the third capacitor C3 and the first terminal of the first resistor R1; the port CAP of the boost converter chip U1 is connected to the second terminal of the third capacitor C3 and the first terminal of the second capacitor C2; the port FB of the boost converter chip U1 is connected to the second terminal of the first resistor R1 and the first terminal of the second resistor R2; the second terminal of the second capacitor C2 and the second terminal of the second resistor R2 are grounded.

3. The safe power supply for oilfield equipment according to claim 1, characterized in that, The bidirectional DC-DC module includes: a positive input terminal U1 and a negative input terminal U0 for connection to a capacitor boost module; the positive input terminal U1 is connected to the first terminal of the fourth capacitor C4, the collector of the first switching transistor Q1, and the negative terminal of the first diode; the negative input terminal U0 is connected to the second terminal of the fourth capacitor C4, the emitter of the second switching transistor, the anode of the second diode D2, the first terminal of the fifth capacitor C5, and the negative terminal of the energy storage battery pack; the emitter of the first switching transistor Q1 and the collector of the second switching transistor Q2 are connected to the first terminal of the second inductor L2; the bases of the first switching transistor Q1 and the second switching transistor Q2 are both connected to the energy storage switching module; the second terminal of the second inductor L2 is connected to the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the second terminal of the fifth capacitor C5 and the positive terminal of the energy storage battery pack.

4. The safe power supply for oilfield equipment according to claim 1, characterized in that, The power switch module uses a field-effect transistor switching circuit.

5. The safe power supply for oilfield equipment according to claim 4, characterized in that, The safe power supply for the oilfield equipment also includes: an overcurrent protection module; The overcurrent protection module is connected to the input terminal of the DC-AC conversion module to detect the current input to the DC-AC conversion module.

6. The safe power supply for oilfield equipment according to claim 5, characterized in that, The overcurrent protection module includes: a fourth resistor R4, the first end of which is connected to the input terminal of the DC-AC conversion module; the second terminal of the fourth resistor R4 is connected to the positive terminal of the sixth polarized capacitor C6 and the positive input pin 2 of comparator U2; the negative input pin 3 of comparator U2 is connected to the sliding contact of the sliding resistor Rp; pin 8 of comparator U2 and the first terminal of the sliding resistor Rp are connected to power supply VCC1; pins 4 and 1 of comparator U2, the second terminal of the sliding resistor Rp, and the negative terminal of the sixth polarized capacitor C6 are grounded; the output pin 7 of comparator U2 is connected to the first terminal of the fifth resistor R5; the second terminal of the fifth resistor R5 is connected to the first terminal of the sixth resistor R6, the positive terminal of the seventh polarized capacitor C7, and the output terminal OUT of the overcurrent protection module; the negative terminal of the seventh polarized capacitor C7 is grounded; and the second terminal of the sixth resistor R6 is connected to power supply VCC1.

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