A DC power supply circuit for auxiliary power supply based on thyristor

Abstract

The utility model discloses a thyristor-based auxiliary power DC power supply circuit, comprising a thyristor main power module, and the thyristor main power module is respectively connected to a battery module and an auxiliary power module, and the auxiliary power module is connected to the battery module; the thyristor main power module is connected to the negative electrode of the battery module by connecting a thyristor drive circuit, and the thyristor drive circuit is used to provide a drive current for the thyristor main power module; the thyristor main power module is connected to the auxiliary power module through a thyristor shut-off circuit, and the thyristor shut-off circuit is used to shut off the thyristor main power module, so as to avoid the auxiliary power module from taking power from the battery module, and reduce the consumption of the energy of the battery module by the internal auxiliary power module of the PCS during the shutdown process, especially when the battery module reaches the lower limit of discharge, the battery module can be protected in time according to the system early warning.

Description

Technical Field

[0001] The utility model relates to the technical field of combining power electronics with energy storage, and in particular to a thyristor-based auxiliary power direct current power supply circuit. Background Art

[0002] In recent years, electrochemical energy storage technology has developed rapidly, forming an energy storage unit with battery cluster + energy storage converter (PCS) as the core. In PCS, the auxiliary power supply usually exists in the form of a flyback converter, which plays a vital role in the stability of the entire system. For the combination of on-grid (off-grid) PCS and lead-acid batteries, there are generally three ways to obtain power from the auxiliary power supply, namely from the battery side, bus side and AC side, such as Figure 1 As shown. When the PCS is in shutdown state for a long time, the bus has no voltage, and the battery voltage is higher than the rectifier output voltage. At this time, the voltage and current that the auxiliary power supply needs to output to the control part are all provided by the battery side, consuming the battery energy. If the PCS is not in operation for a long time, it will affect the battery state of charge (SOC) and affect normal operation. When the battery is in a discharge state and runs to the lower limit of the battery voltage output, the auxiliary power supply still draws power from the battery side, which will cause battery loss, affect the normal operation of the equipment, and cause economic losses.

[0003] Therefore, it is necessary to provide a thyristor-based auxiliary power DC power supply circuit to solve the problems mentioned in the above background technology. Utility Model Content

[0004] To achieve the above object, the utility model provides the following technical solution: a thyristor-based auxiliary power supply DC power supply circuit, comprising:

[0005] A thyristor main power module, and the thyristor main power module is respectively connected to a battery module and an auxiliary power module, and the auxiliary power module is connected to the battery module;

[0006] The thyristor main power module is connected to the negative electrode of the battery module by connecting the thyristor drive circuit, and the thyristor drive circuit is used to provide a drive current for the thyristor main power module;

[0007] The thyristor main power module is connected to the auxiliary power module via a thyristor shutdown circuit, and the thyristor shutdown circuit is used to shut down the thyristor main power module to prevent the auxiliary power module from drawing power from the battery module.

[0008] As a preferred technical solution of the utility model, the thyristor drive circuit includes: a linkage controllable relay S1, a current limiting resistor R1, a linkage controllable relay S3, and a load resistor R2;

[0009] The linkage controllable relay S1 is connected in series with the current limiting resistor R1 to form a first series circuit connected in parallel with the thyristor main power module, and the first series circuit is connected to the control electrode of the thyristor main power module;

[0010] The cathode of the thyristor main power module is connected in series with the linkage controllable relay 2 S3 and the load resistor R2 and is connected to the negative electrode of the battery module;

[0011] The anode of the thyristor main power module is connected to the positive electrode of the battery module.

[0012] As a preferred technical solution of the present utility model, a fuse F1 is connected in series between the battery module and the thyristor main power module.

[0013] As a preferred technical solution of the utility model, the thyristor shutdown circuit is connected in parallel with the thyristor main power module, the current input end of the thyristor shutdown circuit is connected to the positive electrode of the battery module, and the current output end of the thyristor shutdown circuit is connected to the negative electrode of the battery module;

[0014] The thyristor turn-off circuit comprises: a bidirectional relay S2 and a turn-off capacitor C1;

[0015] The shut-off capacitor C1 and the auxiliary power module transformer T1 are respectively connected in parallel with the thyristor main power module;

[0016] Along the current flow direction, the bidirectional relay S2 is located on the parallel line where the shut-off capacitor C1 is located, and the bidirectional relay S2 is located behind the shut-off capacitor C1. One of the contacts of the bidirectional relay S2 is located on the line connecting the thyristor shut-off circuit and the negative pole of the battery module; the other contact of the bidirectional relay S2 is located on the parallel line where the auxiliary power module transformer T1 is located.

[0017] As a preferred technical solution of the utility model, the thyristor turn-off circuit further includes a capacitor discharge resistor R3;

[0018] The capacitor discharge resistor R3 is connected in parallel with the turn-off capacitor C1;

[0019] Another contact of the bidirectional relay S2 is located on the bus line of the parallel circuit where the auxiliary power module transformer T1 is located and the parallel circuit where the capacitor discharge resistor R3 is located.

[0020] As a preferred technical solution of the utility model, the thyristor turn-off circuit further includes a capacitor charging current limiting resistor R4;

[0021] The capacitor charging current limiting resistor R4 is connected in series with the auxiliary power module transformer T1.

[0022] As a preferred technical solution of the utility model, the thyristor turn-off circuit further includes a rectifier diode D1;

[0023] The rectifier diode D1 is connected in series with the auxiliary power module transformer T1.

[0024] Compared with the prior art, the utility model provides a thyristor-based auxiliary power supply DC power supply circuit, which has the following beneficial effects:

[0025] In the utility model, the designed circuit can effectively reduce the consumption of battery energy by the internal auxiliary power supply of the PCS during shutdown, especially when the battery reaches the lower discharge limit, the battery can be protected in time according to the system warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a thyristor-based auxiliary power supply DC power supply circuit Background technology A schematic diagram of an auxiliary power supply power supply method;

[0027] Figure 2 It is a schematic diagram of the structure of a thyristor-based auxiliary power supply DC power supply circuit control module;

[0028] Figure 3 It is a schematic diagram of a DC power supply circuit of an auxiliary power supply based on a thyristor;

[0029] In the figure: 101, battery module; 102, thyristor main power module; 103, auxiliary power module; 104, thyristor drive circuit; 105, thyristor shutdown circuit. DETAILED DESCRIPTION

[0030] See also Figure 2-3 The utility model provides a thyristor-based auxiliary power supply DC power supply circuit, comprising:

[0031] A thyristor main power module 102, and the thyristor main power module 102 is respectively connected to the battery module 101 and the auxiliary power module 103, and the auxiliary power module 103 is connected to the battery module 101;

[0032] The thyristor main power module 102 is connected to the negative electrode of the battery module 101 by connecting the thyristor driving circuit 104, and the thyristor driving circuit 104 is used to provide a driving current for the thyristor main power module 102;

[0033] The thyristor main power module 102 is connected to the auxiliary power module 103 via a thyristor turn-off circuit 105 . The thyristor turn-off circuit 105 is used to turn off the thyristor main power module 102 to prevent the auxiliary power module 103 from drawing power from the battery module 101 .

[0034] Specifically, the thyristor main power module 102 includes an SCR (main power thyristor).

[0035] In this embodiment, the thyristor driving circuit 104 includes: a linkage controllable relay 1 S1, a current limiting resistor R1, a linkage controllable relay 2 S3, and a load resistor R2;

[0036] The linkage controllable relay S1 is connected in series with the current limiting resistor R1 to form a first series circuit connected in parallel with the thyristor main power module 102, and the first series circuit is connected to the control electrode of the thyristor main power module 102;

[0037] The cathode of the thyristor main power module 102 is connected in series with the linkage controllable relay 2 S3 and the load resistor R2 and is connected to the negative electrode of the battery module 101;

[0038] The anode of the thyristor main power module 102 is connected to the positive electrode of the battery module 101 .

[0039] In this embodiment, a fuse F1 is connected in series between the battery module 101 and the thyristor main power module 102 .

[0040] Specifically, the fuse F1 is located on the bus line of the parallel circuit of the first series circuit and the thyristor main power module 102 .

[0041] In this embodiment, the thyristor shutdown circuit 105 is connected in parallel with the thyristor main power module 102, the current input end of the thyristor shutdown circuit 105 is connected to the positive electrode of the battery module 101, and the current output end of the thyristor shutdown circuit 105 is connected to the negative electrode of the battery module 101;

[0042] The thyristor turn-off circuit 105 includes: a bidirectional relay S2 and a turn-off capacitor C1;

[0043] The turn-off capacitor C1 and the transformer T1 of the auxiliary power module 103 are respectively connected in parallel with the thyristor main power module 102;

[0044] Along the current flow direction, the bidirectional relay S2 is located on the parallel line where the shut-off capacitor C1 is located, and the bidirectional relay S2 is located behind the shut-off capacitor C1. One of the contacts of the bidirectional relay S2 is located on the line connecting the thyristor shut-off circuit 105 and the negative pole of the battery module 101; the other contact of the bidirectional relay S2 is located on the parallel line where the transformer T1 of the auxiliary power module 103 is located.

[0045] In this embodiment, the thyristor turn-off circuit 105 further includes a capacitor discharge resistor R3;

[0046] The capacitor discharge resistor R3 is connected in parallel with the turn-off capacitor C1;

[0047] Another contact of the bidirectional relay S2 is located on the bus line of the parallel circuit where the transformer T1 of the auxiliary power module 103 is located and the parallel circuit where the capacitor discharge resistor R3 is located.

[0048] In this embodiment, the thyristor turn-off circuit 105 further includes a capacitor charging current limiting resistor R4;

[0049] The capacitor charging current limiting resistor R4 is connected in series with the transformer T1 of the auxiliary power module 103 .

[0050] In this embodiment, the thyristor turn-off circuit 105 further includes a rectifier diode D1;

[0051] The rectifier diode D1 is connected in series with the transformer T1 of the auxiliary power module 103 .

[0052] The specific working principle of the circuit in this application is as follows:

[0053] 1. The system receives the DC side start command of the auxiliary power module 103, closes the linkage controllable relay 1 S1 and the linkage controllable relay 2 S3, provides driving current for the thyristor main power module 102, and the thyristor main power module 102 is turned on;

[0054] 2. After the auxiliary power module 103 is successfully started, the linkage controllable relay 1 S1 and the linkage controllable relay 2 S3 are disconnected. At this time, based on the basic characteristics of the thyristor (positive feedback mechanism), the thyristor main power module 102 remains in the on state, and the auxiliary power module 103 works normally;

[0055] 3. The auxiliary power transformer T1 charges the shutdown capacitor C1 through the single-phase rectifier circuit, and the bidirectional relay S2 is closed at contact 2;

[0056] 4. When the system receives an instruction to enter a long-term shutdown or a battery discharge lower limit protection shutdown, the bidirectional relay S2 switches from contact 2 to contact 1;

[0057] 5. A reverse voltage is applied between the SCR anode and cathode by the cut-off capacitor C1, and the thyristor main power module 102 is turned off;

[0058] 6. The auxiliary power module 103 shuts down, S2 returns from contact 1 to contact 2, and the capacitor C1 is turned off for discharge, waiting for the next charge.

[0059] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thyristor-based auxiliary power supply DC power supply circuit, characterized in that: include: A thyristor main power module (102), wherein the thyristor main power module (102) is respectively connected to a battery module (101) and an auxiliary power module (103), and the auxiliary power module (103) is connected to the battery module (101); The thyristor main power module (102) is connected to the negative electrode of the battery module (101) by connecting the thyristor drive circuit (104), and the thyristor drive circuit (104) is used to provide a drive current for the thyristor main power module (102); The thyristor main power module (102) is connected to the auxiliary power module (103) via a thyristor turn-off circuit (105), and the thyristor turn-off circuit (105) is used to turn off the thyristor main power module (102) to prevent the auxiliary power module (103) from drawing power from the battery module (101).

2. The auxiliary power DC power supply circuit based on thyristor according to claim 1, characterized in that: The thyristor drive circuit (104) comprises: a linkage controllable relay S1, a current limiting resistor R1, a linkage controllable relay S3, and a load resistor R2; The linked controllable relay S1 is connected in series with the current limiting resistor R1, and the formed first series circuit is connected in parallel with the thyristor main power module (102), and the first series circuit is connected to the control electrode of the thyristor main power module (102); The cathode of the thyristor main power module (102) is connected in series with the linkage controllable relay 2 S3 and the load resistor R2 and is connected to the negative electrode of the battery module (101); The anode of the thyristor main power module (102) is connected to the positive electrode of the battery module (101).

3. The auxiliary power DC power supply circuit based on thyristor according to claim 1, characterized in that: A fuse F1 is connected in series between the battery module (101) and the thyristor main power module (102).

4. The auxiliary power DC power supply circuit based on thyristor according to claim 1, characterized in that: The thyristor turn-off circuit (105) is connected in parallel with the thyristor main power module (102), the current input end of the thyristor turn-off circuit (105) is connected to the positive electrode of the battery module (101), and the current output end of the thyristor turn-off circuit (105) is connected to the negative electrode of the battery module (101); The thyristor turn-off circuit (105) comprises: a bidirectional relay S2 and a turn-off capacitor C1; The turn-off capacitor C1 and the transformer T1 of the auxiliary power module (103) are respectively connected in parallel with the thyristor main power module (102); Along the current flow direction, the bidirectional relay S2 is located on the parallel line where the shutoff capacitor C1 is located, and the bidirectional relay S2 is located behind the shutoff capacitor C1. One of the contacts of the bidirectional relay S2 is located on the line connecting the thyristor shutoff circuit (105) and the negative electrode of the battery module (101); the other contact of the bidirectional relay S2 is located on the parallel line where the transformer T1 of the auxiliary power module (103) is located.

5. The auxiliary power DC power supply circuit based on thyristor according to claim 4, characterized in that: The thyristor turn-off circuit (105) further includes a capacitor discharge resistor R3; The capacitor discharge resistor R3 is connected in parallel with the turn-off capacitor C1; Another contact of the bidirectional relay S2 is located on the bus line of the parallel circuit where the transformer T1 of the auxiliary power module (103) is located and the parallel circuit where the capacitor discharge resistor R3 is located.

6. The auxiliary power DC power supply circuit based on thyristor according to claim 4, characterized in that: The thyristor turn-off circuit (105) further includes a capacitor charging current limiting resistor R4; The capacitor charging current limiting resistor R4 is connected in series with the transformer T1 of the auxiliary power module (103).

7. The auxiliary power DC power supply circuit based on thyristor according to claim 4, characterized in that: The thyristor turn-off circuit (105) further includes a rectifier diode D1; The rectifier diode D1 is connected in series with the transformer T1 of the auxiliary power module (103).

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