CN215120255U

CN215120255U - Self-switching bidirectional direct current conduction device

Info

Publication number: CN215120255U
Application number: CN202120561864.6U
Authority: CN
Inventors: 蔡洛; 马超群; 李现亭
Original assignee: Easite Group Henan Co ltd
Current assignee: Yishite Energy Storage Technology Co ltd; Yishite Energy Storage Technology Henan Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-12-10
Anticipated expiration: 2031-03-18

Abstract

The application relates to a two-way direct current who switches over from device, including detection circuitry, control circuit, anodal conducting circuit and negative pole conducting circuit, detection circuitry connects I section generating line and II section generating line, and control circuit connects detection circuitry, anodal conducting circuit and negative pole conducting circuit, and anodal conducting circuit connects the anodal of I section generating line and the positive pole of II section generating line, and the negative pole of negative pole conducting circuit connection I section generating line and the negative pole of II section generating line. The detection circuit detects the voltage values of the I section bus and the II section bus and sends the voltage values to the control circuit. The control circuit can compare the pressure difference of the I section bus and the II section bus through the received voltage value, and controls the conduction of the anode conduction circuit and the cathode conduction circuit when the absolute value of the pressure difference is greater than a preset value, so that the automatic seamless bus connection between the I section bus and the II section bus is realized, the normal power supply requirement is met, the control circuit is simple, the energy consumption is low, the short-time power failure cannot occur, and the safe operation of the power system is ensured.

Description

Self-switching bidirectional direct current conduction device

Technical Field

The present application relates to the field of power technology equipment, and more particularly, to a self-switching bidirectional dc conduction device.

Background

At present, in places such as large-scale substations and power stations with voltage levels of 110KV and above, power supplies for communication equipment, protection equipment, automatic devices, emergency lighting, emergency power supplies and breaker operation are all direct-current power supplies. In order to ensure the safety and reliability of the operation of the power system, the operation power supply needs to adopt a mode of double-power-supply double-bus wiring of direct-current power supply equipment according to national grid requirements, when the power supply equipment of one bus fails and loses voltage, the bus is directly connected with another bus, and the other set of power supply equipment is adopted for supplying power, so that the load on the voltage-losing bus section can continue to work.

At present, a common transformer substation is generally wired in a main bus segmentation mode, and an isolating switch is arranged between two sections of buses. When one section of bus is in voltage loss, the bus connection mode of the direct current screen in the double-bus direct current power supply system is basically that the isolating switch is manually switched on and off for bus connection, but because the manual operation is needed and the time consumption for judging the voltage difference range of the buses at two sides is too long, the short-time power failure of the load and the protection device connected to the buses can be caused, and the safe operation of the power system is directly influenced.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is desirable to provide a bidirectional dc conduction device that is simple to control and can realize automatic switching to solve the above problems.

A self-switching bidirectional dc conducting device, comprising: the detection circuit is connected with the I section bus and the II section bus, the control circuit is connected with the detection circuit, the anode conduction circuit and the cathode conduction circuit, the anode conduction circuit is connected with the anode of the I section bus and the anode of the II section bus, and the cathode conduction circuit is connected with the cathode of the I section bus and the cathode of the II section bus;

the detection circuit detects the voltage values of the I section bus and the II section bus and sends the voltage values to the control circuit, and the control circuit controls the on-off of the anode conduction circuit and the cathode conduction circuit.

In one embodiment, the current limiting device further comprises two current limiting assemblies, the number of the positive pole conducting circuits is two, the two positive pole conducting circuits are connected with the positive pole of the I section bus and the positive pole of the II section bus, and the current limiting assemblies are connected in series with a loop where one positive pole conducting circuit is located.

In one embodiment, the positive conduction circuit comprises a first positive conduction circuit and a second positive conduction circuit, the first positive conduction circuit comprises a switching tube Q1, a switching tube Q2, a conduction tube D1 and a conduction tube D2, and the second positive conduction circuit comprises a switching tube Q5, a switching tube Q6, a conduction tube D5 and a conduction tube D6;

the control ends of the switching tube Q1, the switching tube Q2, the switching tube Q5 and the switching tube Q6 are connected to a control circuit; the first end of the switch tube Q1 is connected with the anode of the I-section bus and the cathode of the conduction tube D1, and the second end of the switch tube Q1 is connected with the anode of the conduction tube D1, the second end of the switch tube Q2 and the anode of the conduction tube D2; the first end of the switch tube Q2 is connected with the negative electrode of the conduction tube D2 and the positive electrode of the II-section bus; the first end of the switch tube Q5 is connected with the anode of the I-section bus and the cathode of the conduction tube D5, and the second end of the switch tube Q5 is connected with the anode of the conduction tube D5, the second end of the switch tube Q6 and the anode of the conduction tube D6; the first end of the switch tube Q6 is connected with the negative electrode of the conduction tube D6 and the positive electrode of the II-section bus.

In one embodiment, the negative conduction circuit comprises a switch tube Q3, a switch tube Q4, a conduction tube D3 and a conduction tube D4, and control ends of the switch tube Q3 and the switch tube Q4 are connected to the control circuit; the first end of the switch tube Q3 is connected with the negative electrode of the I-section bus and the negative electrode of the conduction tube D3, and the second end of the switch tube Q3 is connected with the positive electrode of the conduction tube D3, the second end of the switch tube Q4 and the positive electrode of the conduction tube D4; the first end of the switch tube Q4 is connected with the negative electrode of the conduction tube D4 and the negative electrode of the II-section bus.

In one embodiment, the control circuit comprises a main controller, an analog conditioning circuit, a driving circuit and a communication interface, wherein the main controller is connected with the analog conditioning circuit, the driving circuit and the communication interface, the analog conditioning circuit is connected with the detection circuit, the driving circuit is connected with the positive conducting circuit and the negative conducting circuit, and the communication interface is connected with the external monitoring equipment.

In one embodiment, the master is a DSP chip or a single chip.

In one embodiment, the detection circuit comprises a first voltage acquisition module and a second voltage acquisition module, the first voltage acquisition module is connected between the positive pole and the negative pole of the I section bus, the second voltage acquisition module is connected between the positive pole and the negative pole of the II section bus, and the first voltage acquisition module and the second voltage acquisition module are both connected with the control circuit.

In one embodiment, the first voltage acquisition module and the second voltage acquisition module are both voltage transmitters.

In one embodiment, the bus-bar-type power supply further comprises a double-power-supply device, wherein the double-power-supply device is connected with the I section bus bar, the II section bus bar and the control circuit.

In one embodiment, the bus bar further comprises a fuse, one end of the fuse is connected with the positive pole conduction circuit, and the other end of the fuse is connected with the positive pole of the I section bus bar or the positive pole of the II section bus bar.

According to the self-switching bidirectional direct current conduction device, the detection circuit detects the voltage values of the I section bus and the II section bus and sends the voltage values to the control circuit. The control circuit can compare the pressure difference of the I section bus and the II section bus through the received voltage value, and controls the conduction of the anode conduction circuit and the cathode conduction circuit when the absolute value of the pressure difference is greater than a preset value, so that the automatic seamless bus connection between the I section bus and the II section bus is realized, the normal power supply requirement is met, the control circuit is simple, the energy consumption is low, the short-time power failure cannot occur, and the safe operation of the power system is ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a circuit diagram of a self-switching bidirectional DC conduction device;

fig. 2 is a system block diagram of the control circuit.

Description of reference numerals: 112. a first voltage acquisition module; 114. a second voltage acquisition module; 120. a control circuit; 130. a positive electrode conducting device; 140. a negative electrode conduction device; 121. a master controller; 122. an analog conditioning circuit; 123. a drive circuit; 124. a communication interface.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that the terms "first," "second," and the like as used herein may be used herein to describe various devices, but these devices are not limited by these terms. These terms are only used to distinguish one device from another. For example, a first apparatus may be termed a second apparatus, and, similarly, a second apparatus may be termed a first apparatus, without departing from the scope of the present application. The first device and the second device are both some device of the same kind, but they are not the same device.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

For convenience of understanding, an application scenario of the device is explained, and the device is used in a substation place with double direct-current power supplies and is provided with two groups of storage batteries, two groups of charging devices and two sections of buses for supplying power. A set of direct current power supply corresponds to a group of storage batteries and a charging device for charging the storage batteries, each group of storage batteries and the charging device are connected to the same section of bus, power is supplied to the connected bus, and then the connected loads are supplied with power through the bus. This application switches on the device and connects between two sections generating lines for carry out the bus-tie to two sections generating lines. When the device normally operates, each group of direct current power supplies and buses operate independently, the connected loads are supplied with power respectively, and the conduction device is also in a standby isolation state. When one set of direct current power supply has faults, voltage loss, overhaul or test, the bus connected with the direct current power supply needs to be subjected to bus connection with the other section of bus, the other set of normally operated direct current power supply is used for supplying power to the fault bus, and the conduction device has the function of conducting two-way conduction of the two sections of buses in a self-switching mode.

As shown in fig. 1, the positive electrode of the dc power supply I is connected to the positive electrode of the I-section bus, the negative electrode of the dc power supply I is connected to the negative electrode of the I-section bus, the positive electrode of the dc power supply II is connected to the positive electrode of the II-section bus, the negative electrode of the dc power supply II is connected to the negative electrode of the II-section bus, and the two dc power supplies respectively supply power to the two-section bus. When the direct-current power supply I fails to normally supply power in a voltage loss mode, the device conducts bus coupling of the section I and the section II, and the voltage of the section I bus is supplied to normal voltage by the direct-current power supply II connected with the section II bus; when the direct current power supply II fails to normally supply power due to voltage loss, the device is conducted to bus-bar connection of the II section and the I section, and the voltage of the II section bus is supplied to normal voltage by the direct current power supply I connected with the I section bus. Furthermore, the positive pole of the direct current power supply I and the positive pole loop of the direct current power supply II can be connected with two conduction tubes, and the conduction tubes are specifically non-return diodes and play a role in isolating the failed direct current power supply. The check diode D7 is connected with the positive pole of the direct current power supply I and the positive pole of the I section bus, and the check diode D8 is connected with the positive pole of the direct current power supply II and the positive pole of the II section bus. When direct current power supply I trouble, this application device switches on with I section and II section bus mother allies oneself with, and the voltage of I section bus is supplied normal voltage by II section bus, and contrary diode D7 that ends is in ending operating condition all the time this moment, keeps apart direct current power supply I's fault voltage input to I section bus. When DC power supply II broke down, the device switched on with II section and I section generating line bus-bar female coupling, and the voltage of II section generating line supplies normal voltage by I section generating line, and contrary diode D8 that ends is in the operating condition all the time this moment, keeps apart DC power supply II's fault voltage input to II section generating line.

In one embodiment, as shown in fig. 1, the present application provides a self-switching bidirectional dc conducting device, including: a detection circuit 110, a control circuit 120, a positive conduction circuit 130 and a negative conduction circuit 140; the detection circuit 110 is connected with the I section bus and the II section bus, the control circuit 120 is connected with the detection circuit 110, the anode conduction circuit 130 and the cathode conduction circuit 140, the anode conduction circuit 130 is connected with the anode of the I section bus and the anode of the II section bus, the cathode conduction circuit 140 is connected with the cathode of the I section bus and the cathode of the II section bus, and the anode conduction circuit 130 and the cathode conduction circuit 140 are both connected with the control circuit 120.

Specifically, the detection circuit 110 detects voltage values of the I-section bus and the II-section bus, and inputs the detected voltage values into the control circuit 120, the control circuit 120 determines a voltage difference Δ u between the I-section bus and the II-section bus through analysis, and then the control circuit 120 compares the voltage difference Δ u with a preset value n, and when an absolute value of the voltage difference Δ u is greater than and/or equal to the preset value n, it is obtained that the I-section bus or the II-section bus is in a voltage loss state. The preset value n is a voltage-loss difference alarm value, and the value thereof is not unique, and can be set according to actual needs, for example, the value can be 5V, which is not limited in this embodiment. At this time, the control circuit 120 will conduct the positive conduction circuit 130 and the negative conduction circuit 140, so that the I-section bus and the II-section bus are in bus connection, and the two-section bus is powered by the normally operating dc power supply, so as to ensure the normal operation of the load, the protection device, and other devices.

The above-mentioned two-way direct current who switches over from device, including detection circuitry 110, control circuit 120, anodal conducting circuit 130 and negative pole conducting circuit 140, when detection circuitry 110 detects to have the decompression between I section generating line and the II section generating line, send the order through control circuit 120 and switch on anodal conducting circuit and negative pole conducting circuit, realize the automatic seamless mother of I section generating line between the generating line and the II section generating line and ally oneself with, satisfy normal power supply demand, control circuit is simple and the energy consumption is lower, the short-term outage can not appear, ensure electric power system's safe operation.

In an embodiment, the self-switching bidirectional dc conducting device further includes a current limiting component, and specifically, the current limiting component includes a resistor R1 and an inductor L1. The number of the positive conduction circuits 130 is two, and the two positive conduction circuits 130 include a first positive conduction circuit and a second positive conduction circuit, and the two positive conduction circuits 130 are both connected with the positive electrode of the first-section bus and the positive electrode of the second-section bus. The current limiting component is connected in series with a loop where one of the anode conducting circuits 130 is located, the loop where the current limiting component is connected in series is called a power loop, and the other anode conducting loop is a main loop. As shown in fig. 1, in the present embodiment, the first positive conduction circuit is illustrated by connecting the resistor R1 and the inductor L1, but the second positive conduction circuit may be connected, and the present embodiment is not limited thereto. Firstly, the positive electrode of the I-section bus and the positive electrode of the II-section bus are connected with an inductor L1 through a first positive electrode conduction device and a resistor R1 to perform bus coupling, and the resistor R1 and the inductor L1 can reduce inrush current generated by pressure difference when the I-section bus and the II-section bus start bus coupling. After the bus of the first segment and the bus of the second segment are coupled and then operate for a period of time, the control circuit 120 calculates the voltage difference from the voltage value obtained by the detection circuit 110, and when the voltage difference reaches the allowable bus coupling safety voltage difference m. The value of m is not unique for allowing the bus tie safety voltage difference, and can be set according to actual needs, for example, the value can be 1V, and this embodiment is not limited thereto. The control circuit 120 will turn off the first positive conduction circuit, turn on the positive electrode of the second positive conduction circuit directly bus-coupled I-section bus and the positive electrode of the II-section bus, and switch the slave power loop back to the master loop.

In this embodiment, the device further adds a current-limiting element and two positive conduction circuits to play a role in protection, and the current-limiting element is switched to a direct bus coupler after the safe voltage of the bus coupler is allowed to be achieved, so that the current-limiting element is effectively prevented from generating redundant power consumption, and the safe and reliable operation of the whole power equipment is also ensured.

In one embodiment, the first positive conduction circuit comprises a switching tube Q1, a switching tube Q2, a conduction tube D1 and a conduction tube D2, and the second positive conduction circuit comprises a switching tube Q5, a switching tube Q6, a conduction tube D5 and a conduction tube D6; the control ends of the switching tube Q1, the switching tube Q2, the switching tube Q5 and the switching tube Q6 are all connected to the control circuit 120; the first end of the switch tube Q1 is connected with the anode of the I-section bus and the cathode of the conduction tube D1, and the second end of the switch tube Q1 is connected with the anode of the conduction tube D1, the second end of the switch tube Q2 and the anode of the conduction tube D2; the first end of the switch tube Q2 is connected with the negative electrode of the conduction tube D2 and the positive electrode of the II-section bus; the first end of the switch tube Q5 is connected with the anode of the I-section bus and the cathode of the conduction tube D5, and the second end of the switch tube Q5 is connected with the anode of the conduction tube D5, the second end of the switch tube Q6 and the anode of the conduction tube D6; the first end of the switch tube Q6 is connected with the negative electrode of the conduction tube D6 and the positive electrode of the II-section bus.

In one embodiment, the negative conduction circuit comprises a switch tube Q3, a switch tube Q4, a conduction tube D3 and a conduction tube D4, and control ends of the switch tube Q3 and the switch tube Q4 are connected to the control circuit 120; the first end of the switch tube Q3 is connected with the negative electrode of the I-section bus and the negative electrode of the conduction tube D3, and the second end of the switch tube Q3 is connected with the positive electrode of the conduction tube D3, the second end of the switch tube Q4 and the positive electrode of the conduction tube D4; the first end of the switch tube Q4 is connected with the negative electrode of the conduction tube D4 and the negative electrode of the II-section bus.

Specifically, in an embodiment, the switch tube is a triode, the control terminal of the switch tube is specifically a base electrode of the triode, the first terminal of the switch tube is specifically a collector electrode of the triode, and the second terminal of the switch tube is specifically an emitter electrode of the triode. Further, in one embodiment, the conduction tube is a diode. As shown in fig. 1, the first positive conduction circuit includes a transistor Q1, a transistor Q2, a diode D1, and a diode D2, and the second positive conduction circuit includes a transistor Q5, a transistor Q6, a diode D5, and a diode D6. The base electrode of each triode is connected to the control circuit 120, the collector electrodes of the triode Q1 and the triode Q5 are connected with the positive electrode of the I section bus, and the collector electrodes of the triode Q2 and the triode Q6 are connected with the positive electrode of the II section bus. The collector of the transistor Q1 is also connected to the cathode of the diode D1, the emitter of the transistor Q1 is connected to the anode of the diode D1, the emitter of the transistor Q2 and the anode of the diode D2, and the collector of the transistor Q2 is also connected to the cathode of the diode D2. The collector of the transistor Q5 is also connected to the cathode of the diode D5, the emitter of the transistor Q5 is connected to the anode of the diode D5, the emitter of the transistor Q6 and the anode of the diode D6, and the collector of the transistor Q6 is also connected to the cathode of the diode D6.

The negative conduction circuit comprises a transistor Q3, a transistor Q3, a diode D4 and a diode D4. The base electrode of each triode is connected to the control circuit 120, the collector electrode of the triode Q3 is connected with the negative electrode of the I section bus, and the collector electrode of the triode Q4 is connected with the negative electrode of the II section bus. The collector of the transistor Q3 is also connected to the cathode of the diode D3, the emitter of the transistor Q3 is connected to the anode of the diode D3, the emitter of the transistor Q4 and the anode of the diode D4, and the collector of the transistor Q4 is also connected to the cathode of the diode D4.

Specifically, the way for the control circuit 120 to calculate the voltage difference Δ u is not unique, and may be that the voltage value of the I-section bus is subtracted from the voltage value of the II-section bus, or that the voltage value of the II-section bus is subtracted from the voltage value of the I-section bus.

When the voltage difference Δ u is greater than and/or equal to n, where n is a preset value and a value of n is an integer greater than zero, it indicates that the direct-current power supply II cannot normally supply power and the bus of the section II is in a voltage loss state. At this time, the control circuit 120 issues a command to turn on the transistor Q1 and the transistor Q4, the positive electrode of the I-section bus and the positive electrode of the II-section bus are in bus connection with the inductor L1 through the transistor Q1, the diode D2 and the resistor R1, and the negative electrode of the I-section bus and the negative electrode of the II-section bus are in bus connection through the transistor Q4 and the diode D3. The current passes through the positive pole of the direct current power supply I, the triode Q1, the diode D2, the resistor R1, the inductor L1, the positive pole of the section II bus, the load connected with the section II bus, the negative pole of the section II bus, the triode Q4, the diode D3 and the negative pole of the direct current power supply I to form a loop, namely the load connected with the section II bus is switched into the direct current power supply I to supply power. After the bus of the first section and the bus of the second section are in bus-tie and then operate for a period of time, when the differential pressure calculated by the control circuit 120 from the voltage value obtained by the detection circuit 110 reaches the allowable bus-tie safety voltage difference, the control circuit 120 turns off the Q1, turns on the Q5 to bus-tie the positive electrode of the bus of the first section and the positive electrode of the bus of the second section, and the current passes through the positive electrode of the direct current power supply I, the triode Q5, the diode D6, the positive electrode of the bus of the second section, the load connected with the bus of the second section, the negative electrode of the bus of the second section, the triode Q4, the diode D3 and the negative electrode of the direct current power supply I to form a loop.

And when the voltage difference delta u is smaller than and/or equal to-n, wherein n is a preset value, and the value can be an integer larger than zero, which indicates that the direct-current power supply I can not normally supply power at the moment, and the I section bus is in a voltage loss state. At this time, the control circuit 120 issues a command to turn on the transistor Q2 and the transistor Q3, the positive electrode of the I-section bus and the positive electrode of the II-section bus are in bus connection through the transistor Q2 and the diode D1, and the negative electrode of the I-section bus and the negative electrode of the II-section bus are in bus connection through the transistor Q3 and the diode D4. The current passes through the positive pole of the direct current power supply II, the inductor L1, the capacitor R1, the triode Q2, the diode D1, the positive pole of the I section bus, the load connected with the I section bus, the negative pole of the I section bus, the triode Q3, the diode D4 and the negative pole of the direct current power supply II to form a loop, namely the load connected with the I section bus is switched into the direct current power supply II for supplying power. Similarly, after a period of operation, when the bus-tie safety voltage difference is allowed, the control circuit 120 turns off the Q2, turns on the Q6 to connect the positive electrode of the bus-tie section II and the positive electrode of the bus-tie section I, and the current passes through the positive electrode of the dc power supply II, the triode Q6, the diode D5, the positive electrode of the bus-tie section I, the load connected to the bus-tie section I, the negative electrode of the bus-tie section I, the triode Q3, the diode D4, and the negative electrode of the dc power supply II to form a loop.

In the embodiment, the control circuit controls the on-off of the specific switch tube in the positive conducting circuit and the negative conducting circuit according to the pressure difference between the I section bus and the II section bus, so that the automatic seamless bus connection between the I section bus and the II section bus is realized, the normal power supply requirement is met, the control circuit is simple, and the energy consumption is low.

In one embodiment, as shown in fig. 2, the control circuit 120 includes a master controller 121, an analog conditioning circuit 122, a driving circuit 123 and a communication interface 124, the master controller 121 is connected to the analog conditioning circuit 122, the driving circuit 123 and the communication interface 124, the analog conditioning circuit 122 is connected to the detection circuit 110, the driving circuit 123 is connected to the positive conducting circuit 130 and the negative conducting circuit 140, and the communication interface 124 is connected to an external monitoring device.

Specifically, the analog conditioning circuit 122 is an analog-to-digital converter that converts an analog voltage value collected by the detection circuit 110 into a digital differential pressure signal, and then sends the differential pressure signal to the master controller 121 connected thereto, and the master controller 121 will determine whether the differential pressure reaches a condition for triggering an action. In an embodiment, the master controller 121 is a DSP chip or a single chip, which is not limited in this embodiment. When the differential pressure signal reaches the triggering condition, the main controller 121 sends a command to the driving circuit 123, the driving circuit 123 controls the positive conducting circuit 130 and the negative conducting circuit 140 connected with the driving circuit 123, and the corresponding conducting switch tubes realize the bus connection of the first-segment bus and the second-segment bus. In addition, the communication interface 124 is an interface connected with an external monitoring device, and a technical operator can check the running states of the power supply device and the bus by connecting the monitoring device with the device. The communication interface 124 may be a serial port, a CAN bus, or the like, which is not limited in this embodiment.

In this embodiment, the bus coupler operation that can automatically control the chip to be connected with the conduction device to realize the I section bus and the II section bus is adopted, and the control loop is simple and the energy consumption is lower.

In one embodiment, as shown in fig. 1, the detection circuit 110 includes a first voltage collection module 112 and a second voltage collection module 114, the first voltage collection module 112 is connected between the positive electrode and the negative electrode of the I-section bus, the second voltage collection module 114 is connected between the positive electrode and the negative electrode of the II-section bus, and both the first voltage collection module 112 and the second voltage collection module 114 are connected to the control circuit 120. The first voltage acquisition module 112 acquires a voltage value between the positive and negative electrodes of the bus in the section I, the second voltage acquisition module 114 acquires a voltage value between the positive and negative electrodes of the bus in the section II, and then the first voltage acquisition module 112 and the second voltage acquisition module 114 both transmit the detected voltage values to the control circuit 120 to calculate the pressure difference. Specifically, in one embodiment, the first voltage acquisition module 112 and the second voltage acquisition module 114 are both voltage transmitters. The voltage transducer is a device which converts the measured AC voltage, DC voltage and pulse voltage into the output DC voltage according to the linear proportion and isolates the output analog signal. In the embodiment, the voltage transmitter is adopted to acquire the voltage value between the I section bus and the II section bus, so that the structure is simple and the cost is low.

In one embodiment, the bus bar connector further comprises a dual power supply device, and the dual power supply device is connected with the I section bus bar, the II section bus bar and the control circuit 120. When the dc power supply and the bus both work normally, the dual power supply device can select one of the bus of the section I and the bus of the section II to supply power to the control circuit 120, and when one of the buses is out of voltage, the other bus can be adopted to supply power to the control circuit 120. In this embodiment, the dual power supply device can ensure that the control circuit 120 continuously supplies power, detect the differential pressure condition of the two segments of buses in real time, and realize fast switching of the power supply mode, so that the power consumption is more reasonable.

In one embodiment, the bus bar connector is characterized by further comprising a fuse, one end of the fuse is connected with the positive pole conduction circuit, and the other end of the fuse is connected with the positive pole of the I section bus bar or the positive pole of the II section bus bar. As shown in fig. 1, the device includes a FUSE, which can be instantly blown to protect the circuit when a large short-circuit current occurs on the bus.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A self-switching bidirectional direct current conduction device is characterized by comprising a detection circuit, a control circuit, a positive conduction circuit and a negative conduction circuit, wherein the detection circuit is connected with a bus in a section I and a bus in a section II;

the detection circuit detects voltage values of the I section bus and the II section bus and sends the voltage values to the control circuit, and the control circuit controls the on-off of the anode conducting circuit and the cathode conducting circuit.

2. The self-switching bidirectional direct-current conduction device according to claim 1, further comprising a current limiting component, wherein the number of the positive conduction circuits is two, the two positive conduction circuits are connected to the positive electrode of the I-section bus and the positive electrode of the II-section bus, and the current limiting component is connected in series to a loop where one of the positive conduction circuits is located.

3. The self-switching bidirectional DC conducting device according to claim 2, wherein said positive conducting circuit comprises a first positive conducting circuit and a second positive conducting circuit, said first positive conducting circuit comprises a switch tube Q1, a switch tube Q2, a conducting tube D1 and a conducting tube D2, said second positive conducting circuit comprises a switch tube Q5, a switch tube Q6, a conducting tube D5 and a conducting tube D6;

the control ends of the switch tube Q1, the switch tube Q2, the switch tube Q5 and the switch tube Q6 are all connected to the control circuit; the first end of the switch tube Q1 is connected with the anode of the I-section bus and also connected with the cathode of the conduction tube D1, and the second end of the switch tube Q1 is connected with the anode of the conduction tube D1, the second end of the switch tube Q2 and the anode of the conduction tube D2; a first end of the switch tube Q2 is connected with the negative electrode of the conduction tube D2 and the positive electrode of the II-section bus; the first end of the switch tube Q5 is connected with the anode of the I-section bus and also connected with the cathode of the conduction tube D5, and the second end of the switch tube Q5 is connected with the anode of the conduction tube D5, the second end of the switch tube Q6 and the anode of the conduction tube D6; the first end of the switch tube Q6 is connected with the negative electrode of the conduction tube D6 and the positive electrode of the II-section bus bar.

4. The self-switching bidirectional DC conducting device according to claim 2, wherein the negative conducting circuit comprises a switch tube Q3, a switch tube Q4, a conducting tube D3 and a conducting tube D4, and the control terminals of the switch tube Q3 and the switch tube Q4 are connected to the control circuit; the first end of the switch tube Q3 is connected with the negative electrode of the I-section bus and also connected with the negative electrode of the conduction tube D3, and the second end of the switch tube Q3 is connected with the positive electrode of the conduction tube D3, the second end of the switch tube Q4 and the positive electrode of the conduction tube D4; the first end of the switch tube Q4 is connected with the negative electrode of the conduction tube D4 and the negative electrode of the II-section bus.

5. The self-switching bidirectional direct current conduction device according to claim 1, wherein the control circuit comprises a master controller, an analog conditioning circuit, a driving circuit and a communication interface, the master controller is connected with the analog conditioning circuit, the driving circuit and the communication interface, the analog conditioning circuit is connected with the detection circuit, the driving circuit is connected with the positive conduction circuit and the negative conduction circuit, and the communication interface is connected with an external monitoring device.

6. The self-switching bidirectional DC conducting device according to claim 5, wherein said master controller is a DSP chip or a single chip.

7. The self-switching bidirectional direct current conduction device according to claim 1, wherein the detection circuit includes a first voltage collection module and a second voltage collection module, the first voltage collection module is connected between the positive electrode and the negative electrode of the I-section bus, the second voltage collection module is connected between the positive electrode and the negative electrode of the II-section bus, and both the first voltage collection module and the second voltage collection module are connected to the control circuit.

8. The self-switching bidirectional DC conducting device according to claim 7, wherein said first voltage collecting module and said second voltage collecting module are both voltage transmitters.

9. The self-switching bidirectional DC conducting device according to any one of claims 1-8, further comprising a dual power supply device, wherein the dual power supply device is connected to the I section bus, the II section bus and the control circuit.

10. The self-switching bidirectional DC conducting device according to any one of claims 1 to 8, further comprising a fuse, wherein one end of the fuse is connected to the positive conducting circuit, and the other end of the fuse is connected to the positive electrode of the I section bus or the positive electrode of the II section bus.