Three-phase current rectifying device

Abstract

The utility model relates to a three-phase power rectifying device for petroleum drilling, which comprises a three-phase power input interface, a rectifying and filtering circuit, a plurality of DC-DC (Direct Current-Direct Current) conversion circuits with voltage conversion and control functions, and a load interface connected with the DC-DC conversion circuits, the three-phase power input interface is connected with the output end of the turbine generator and is used for accessing three-phase alternating current; the rectifying and filtering circuit is used for rectifying and filtering three-phase electricity accessed from the three-phase electricity input interface, and the DC-DC conversion circuit is used for receiving rectified and filtered direct current to control the DC-DC conversion circuit and outputting direct current with preset magnitude. The three-phase current rectifying device for petroleum drilling provided by the utility model changes the situation that a control chip is adopted to control external end equipment in the prior art, and directly uses one of the DC-DC conversion circuits as a control circuit to control the on and off of other DC-DC circuits. And the complexity and redundancy of circuit design are reduced under the condition of maintaining function realization, so that the overall size of the device is reduced, and the cost is saved.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of power electronics, and in particular to a three-phase electric rectifier device. Background Art

[0002] Three-phase alternating current is an electric power system composed of three alternating current circuits with the same frequency, equal potential amplitude and 120° phase difference. Common alternating current equipment in industrial production all use three-phase electricity. The circuit system that uses electronic devices with switching functions to convert three-phase alternating current into controllable direct current is called a rectifier system. The rectification function of the rectifier system is achieved by triggering the main rectifier circuit through the trigger control circuit. Semiconductor devices are widely used in rectifier circuits because they have the advantages of fast working speed and large rated power.

[0003] With the continuous progress and development of human society and economy, the energy supply required by people in daily production and life is also increasing. In drilling production, it is necessary to measure various underground parameters and perform construction control based on the measured data. The existing power supply methods for various underground measuring instruments include cable power supply, lithium battery power supply and turbine generator power supply. It is now more popular to use turbine generators to power underground electrical equipment. The turbine generator generates three-phase electricity when working underground. However, since most underground electrical equipment uses direct current, the voltage required for power supply is also different. For this reason, a stable and reliable rectifier device is used to output voltage, current and power that meet the requirements. It becomes particularly important. Utility Model Content

[0004] In order to enable the turbine generator to output voltage, current and power that meet the requirements, the embodiment of the utility model provides a three-phase electric rectifier. The three-phase electric rectifier converts the output three-phase electricity into direct current that meets the load requirements according to the different power consumption conditions of the load device, and also simplifies the complexity and redundancy of the circuit, thereby improving the output and use efficiency of the rectifier. The specific technical solution is as follows:

[0005] A three-phase electric rectification device provided by an embodiment of the utility model is characterized in that it includes: a three-phase electric input interface, a rectification and filtering circuit, a multi-channel DC-DC conversion circuit with voltage conversion and control functions, and a load interface connected to the DC-DC conversion circuit; wherein the three-phase electric input interface is connected to the output end of the turbine generator for receiving three-phase alternating current; the rectification and filtering circuit is used to rectify and filter the three-phase electricity received from the three-phase electric input interface, and the DC-DC conversion circuit is used to receive the rectified and filtered direct current to control the DC-DC conversion circuit and output direct current of a preset size; and one of the DC-DC conversion circuits is a switch control circuit.

[0006] Furthermore, the DC-DC conversion circuit includes one control circuit and multiple DC-DC conversion circuits; the output end of the control circuit is respectively connected to the enable ends of the multiple DC-DC conversion circuits.

[0007] Furthermore, the control circuit uses a DC-DC conversion circuit that outputs a voltage of a preset magnitude, which is used to turn on the DC-DC conversion circuit and enable it to operate.

[0008] Furthermore, each of the DC-DC conversion circuits is provided with a heat sink.

[0009] Furthermore, the heat sink is arranged on the back side of the circuit board where the DC-DC conversion chip is located.

[0010] Furthermore, the DC-DC conversion circuit includes a voltage conversion chip, an inductor element and a peripheral circuit of the voltage conversion chip.

[0011] Furthermore, the DC-DC conversion circuit also includes an inductor element fixing plate arranged in parallel therewith.

[0012] Furthermore, the inductor element fixing plate is provided with a plurality of placement holes, and the inductor element is placed in the placement holes.

[0013] A three-phase electric rectifier provided in an embodiment of the utility model includes: a three-phase electric input interface, a rectifier filter circuit, a multi-channel DC-DC conversion circuit with voltage conversion and control functions, and a load interface connected to the DC-DC conversion circuit; wherein the three-phase electric input interface is connected to the output end of the turbine generator for receiving three-phase alternating current; the rectifier filter circuit is used to rectify and filter the three-phase electricity received from the three-phase electric input interface, and the DC-DC conversion circuit is used to receive the rectified and filtered direct current to control the DC-DC conversion circuit and output direct current of a preset size. A three-phase electric rectifier device of the utility model can output multiple direct current voltages simultaneously under the control of a control circuit. The rectification efficiency of the three-phase electric rectifier device is improved.

[0014] Furthermore, the three-phase electric rectifier device provided by the utility model changes the situation in the prior art where a control chip and a peripheral circuit of the control chip are used to control an external device. The utility model directly uses one of the DC-DC conversion circuits as a control circuit to control the opening and closing of other DC-DC conversion circuits. While maintaining the function, the complexity and redundancy of the circuit design are reduced, thereby reducing the overall size of the device and saving costs.

[0015] Furthermore, the three-phase electric rectifier device provided by the utility model has a heat dissipation area for heat dissipation on each DC-DC conversion circuit board. The heat dissipation area is well configured to dissipate a large amount of heat generated by the rectifier circuit during operation to ensure normal operation of the rectifier device.

[0016] Furthermore, in the three-phase electric rectifier device provided by the embodiment of the utility model, a heat sink is arranged on the back of the circuit board where each DC-DC conversion chip is located. Since the DC-DC conversion chip is the main area for heat dissipation of the rectifier circuit, a heat sink is arranged near each DC-DC conversion chip to ensure that the heat generated by each rectifier circuit can be efficiently dissipated, thereby ensuring the working efficiency of the rectifier device.

[0017] Furthermore, the back of the circuit board on which the DC-DC conversion circuit of the three-phase electric rectifier device provided in the embodiment of the utility model depends is also provided with an inductor element fixing plate fixedly arranged parallel to the circuit board, and the fixing plate is used to fix the inductor element on the DC-DC conversion circuit. Since the current flowing through the inductor element when it is working will generate heat, there is a risk of damage to the DC-DC conversion circuit. In order to ensure that the DC-DC conversion circuit can work normally underground without damaging the electronic components, the utility model makes the inductor element not attached to the circuit board on which the DC-DC conversion circuit depends, and fixes it in the fixing plate, so that the heat generated by the inductor element can be well dissipated, ensuring that the electronic components around the inductor element can work normally.

[0018] Furthermore, the inductor element fixing plate of the utility model is provided with a plurality of placement holes, and the inductor elements of each DC-DC conversion circuit are respectively placed in the placement holes, which can better dissipate heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural block diagram of a three-phase electric rectifier device provided by an embodiment of the utility model;

[0020] Figure 2 It is a circuit principle diagram of a rectifier circuit provided by an embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of an inductor element fixing plate provided in an embodiment of the utility model;

[0022] In the figure: 1: Inductor component fixing plate; 2: Placement hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See Figure 1 , is a schematic block diagram of the structure of a three-phase electric rectifier device provided by an embodiment of the utility model, the device comprises: a three-phase electric input interface, a rectifier and filter circuit, a multi-channel DC-DC conversion circuit having voltage conversion and control functions, and a load interface connected to the DC-DC conversion circuit; wherein the three-phase electric input interface is connected to the output end of the turbine generator for receiving three-phase alternating current; the rectifier and filter circuit is used to rectify and filter the three-phase power received from the three-phase electric input interface, and the DC-DC conversion circuit is used to receive the rectified and filtered direct current to control the DC-DC conversion circuit and output direct current of a preset size; one of the DC-DC conversion circuits is a switch control circuit. A three-phase electric rectifier provided in an embodiment of the utility model includes: a three-phase electric input interface, a rectifier filter circuit, a multi-channel DC-DC conversion circuit with voltage conversion and control functions, and a load interface connected to the DC-DC conversion circuit; wherein the three-phase electric input interface is connected to the output end of the turbine generator for receiving three-phase alternating current; the rectifier filter circuit is used to rectify and filter the three-phase electricity received from the three-phase electric input interface, and the DC-DC conversion circuit is used to receive the rectified and filtered direct current to control the DC-DC conversion circuit and output direct current of a preset size. A three-phase electric rectifier device of the utility model can output multiple direct current voltages simultaneously under the control of a control circuit. The rectification efficiency of the three-phase electric rectifier device is improved.

[0025] The DC conversion chip adopts the LT8316 chip commonly used in the art, and uses the LT8316 voltage conversion chip and combines the different settings of peripheral electronic components to convert DC voltages of different sizes.

[0026] See Figure 2 , Figure 2 is a circuit schematic diagram of a rectifier circuit provided by an embodiment of the utility model, Figure 2The rectifier circuit mainly includes: transformer Tr, rectifier diode VT1, rectifier diode VT2, rectifier diode VT3, rectifier diode VT4, rectifier diode VT5, rectifier diode VT6, and load resistor; wherein, the output a end of the transformer Tr is connected between the rectifier diode VT1 and the rectifier diode VT2 connected in series; the output b end is connected between the rectifier diode VT3 and the rectifier diode VT4 connected in series; the output b end is connected between the rectifier diode VT5 and the rectifier diode VT6 connected in series; the load resistor is connected in parallel to both ends of the rectifier diode VT5 and the rectifier diode VT6 connected in series. When the a phase of the three-phase electricity is input, when the voltage value is greater than 0.7V, the rectifier diode VT1 is turned on; the line voltage between ab is respectively turned on to the b phase output through the resistor R and the rectifier diode VT6. Similarly, the working principle of the line voltage between other phases is the same as the working principle of the line voltage between ab phases, which will not be repeated here.

[0027] In an optional implementation manner of the utility model embodiment, the DC-DC conversion circuit includes one control circuit and multiple DC-DC conversion circuits; the output end of the control circuit is respectively connected to the enable ends of the multiple DC-DC conversion circuits.

[0028] In an optional implementation of the embodiment of the utility model, the control circuit uses a DC-DC conversion circuit that outputs a preset voltage to turn on the DC-DC conversion circuit and start it working. The three-phase electric rectifier device provided by the utility model changes the situation in the prior art that a control chip and a peripheral circuit of the control chip are used to control external devices. The utility model directly uses one of the DC-DC conversion circuits as a control circuit to control the opening and closing of other DC-DC conversion circuits. While maintaining the function, the complexity and redundancy of the circuit design are reduced, thereby reducing the overall size of the device and saving costs.

[0029] In an optional implementation of the embodiment of the utility model, each of the DC-DC conversion circuits is provided with a heat sink. The utility model provides a three-phase electric rectifier device, and the utility model provides a heat sink for heat dissipation on each DC-DC conversion circuit board. The heat sink is well configured to dissipate a large amount of heat generated by the rectifier circuit during operation to ensure normal operation of the rectifier device.

[0030] In an optional implementation of the embodiment of the utility model, the heat sink is arranged on the back of the circuit board where the DC-DC conversion chip is located. The three-phase electric rectifier provided by the embodiment of the utility model has heat sinks arranged on the back of the circuit board where each DC-DC conversion chip is located. Since the DC-DC conversion chip is the main area for heat dissipation of the rectifier circuit, a heat sink is arranged near each DC-DC conversion chip to ensure that the heat generated by each rectifier circuit can be efficiently dissipated, thereby ensuring the working efficiency of the rectifier.

[0031] In an optional implementation of the embodiment of the utility model, the DC-DC conversion circuit includes a voltage conversion chip, an inductor element and a peripheral circuit of the voltage conversion chip.

[0032] It should be noted that the filter circuit in the embodiment of the present utility model is a conventional circuit and will not be described in detail here.

[0033] In an optional implementation of an embodiment of the utility model, the DC-DC conversion circuit also includes an inductor element fixing plate 1 arranged in parallel therewith. The back of the circuit board on which the DC-DC conversion circuit of the three-phase electric rectifier device provided in the embodiment of the utility model depends is also provided with an inductor element fixing plate 1 fixedly arranged in parallel with the circuit board, and the fixing plate is used to fix the inductor element on the DC-DC conversion circuit. Since heat is generated when current flows through the inductor element when it is working, there is a risk of damage to the DC-DC conversion circuit. In order to ensure that the DC-DC conversion circuit can work normally underground without damaging electronic components, the utility model makes the inductor element not attached to the circuit board on which the DC-DC conversion circuit depends, and fixes it in the fixing plate, so that the heat generated by the inductor element can be well dissipated, ensuring that the electronic components around the inductor element can work normally.

[0034] In an optional implementation of the embodiment of the utility model, the inductor element fixing plate is provided with a plurality of placement holes, and the inductor element is placed in the placement holes. The inductor element fixing plate of the utility model is provided with a plurality of placement holes, and the inductor element of each DC-DC conversion circuit is placed in the placement holes respectively, which can better dissipate heat.

[0035] See Figure 3 : This is a schematic diagram of the structure of the inductor element fixing plate provided by an embodiment of the utility model. In the figure, the inductor element fixing plate 1 is provided with placement holes 2 that are consistent with the number of the DC-DC conversion circuit. In actual use, the inductor element fixing plate 1 is placed parallel to the circuit board on which the DC-DC conversion circuit depends, and the inductor elements in the DC-DC conversion circuit are respectively placed in each corresponding placement hole 2. The distance between the placement holes 2 is set according to the diagonal line on the small board of the DC-DC conversion circuit, and the distance is the largest, which is convenient for heat dissipation of the inductor.

[0036] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A three-phase electric rectifier device, characterized in that: include: A three-phase power input interface, a rectifying and filtering circuit, a control circuit, a multi-channel DC-DC conversion circuit, and a load interface connected to the DC-DC conversion circuit; wherein the three-phase power input interface is connected to the output end of the turbine generator for receiving three-phase alternating current; the rectifying and filtering circuit is used to rectify and filter the three-phase power received from the three-phase power input interface, and the DC-DC conversion circuit is used to receive the rectified and filtered direct current and then control the DC-DC conversion circuit to output direct current of a preset size.

2. The three-phase electric rectifier device according to claim 1, characterized in that: The DC-DC conversion circuit comprises a control circuit; the output end of the control circuit is respectively connected to the enable end of each of the DC-DC conversion circuits.

3. The three-phase electric rectifier device according to claim 2, characterized in that: The control circuit uses a DC-DC conversion circuit that outputs a preset voltage to turn on the DC-DC conversion circuit and start it working.

4. The three-phase electric rectifier device according to claim 1, characterized in that: Each of the DC-DC conversion circuits is provided with a heat sink.

5. The three-phase electric rectifier device according to claim 4, characterized in that: The heat sink is arranged on the back of the circuit board where the DC-DC conversion chip is located.

6. The three-phase electric rectifier device according to claim 1, characterized in that: The DC-DC conversion circuit includes a voltage conversion chip, an inductor element and a peripheral circuit of the voltage conversion chip.

7. The three-phase electric rectifier device according to claim 6, characterized in that: The back side of the circuit board on which the DC-DC conversion circuit depends is also provided with an inductor element fixing plate which is fixedly arranged parallel to the circuit board.

8. The three-phase electric rectifier device according to claim 7, characterized in that: The inductor element fixing plate is provided with a plurality of placement holes, and the inductor elements are placed in the placement holes.

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