Power supply system and high-voltage ORing circuit

Abstract

The invention provides a power supply system and a high-voltage ORing circuit, and the high-voltage ORing circuit comprises N main power circuits, N is a positive integer greater than or equal to 2; each main power circuit is provided with a DC / DC auxiliary power supply circuit, a sampling circuit and a voltage division circuit, the output ends of the DC / DC auxiliary power supply circuits are mutually isolated, the DC / DC auxiliary power supply circuits can provide an auxiliary power supply for an ORing controller of the corresponding main power circuit, and the output ends of the DC / DC auxiliary power supply circuits are mutually isolated, so that the ORing controller of the corresponding main power circuit can be provided with an auxiliary power supply. Through circuit isolation, the limit value of 100V extreme withstand voltage of the ORing controller is broken, it is ensured that the ORing circuit can be used in a high-voltage circuit above 300V, and the application scenarios of the ORing circuit are greatly expanded.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, specifically to a power supply system and a high-voltage ORing circuit. Background Technology

[0002] In power supply design, redundancy is often used to improve system reliability. This involves designing multiple identical DC / DC converters in the power system so that if one DC / DC converter fails and has no output, the remaining DC / DC converters can still ensure normal system operation. Currently, there are two redundancy design schemes: diode scheme and ORing circuit scheme.

[0003] The diode-based approach connects each DC / DC converter to a common output terminal via a diode. Utilizing the unidirectional conductivity of diodes, fault isolation can be quickly achieved when a DC / DC converter experiences a short circuit or other fault, ensuring normal system operation. However, due to the inherent forward voltage drop of diodes, they suffer from significant heat generation and power loss in high-power applications, especially in high-voltage circuits where the forward voltage drop is even greater, exacerbating the heat generation and power loss. This can lead to safety hazards and inefficiencies in the system.

[0004] The ORing circuit design uses MOSFETs instead of diodes. The on-state voltage drop of a MOSFET is much lower than that of a diode. Compared to diode-based solutions, the ORing circuit design reduces power loss, heat generation, and significantly improves system efficiency, making it the most common solution currently available. Figure 1 As shown. However, most ORing controllers on the market currently have a maximum withstand voltage of 100V, which means that general ORing circuit solutions can only be used for low-voltage circuits below 100V. Summary of the Invention

[0005] In response to this, this application provides a power supply system and a high-voltage ORing circuit to solve the problem that existing ORing circuit solutions are only applicable to low-voltage circuits below 100V and cannot be applied to high-voltage circuits.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] The first aspect of this application discloses a high-voltage ORing circuit, including: N main power circuits, where N is a positive integer greater than or equal to 2;

[0008] Each of the main power circuits is equipped with a DC / DC auxiliary power supply circuit, a sampling circuit, and a voltage divider circuit. The output terminals of each DC / DC auxiliary power supply circuit are isolated from each other.

[0009] Optionally, in the above-mentioned high-voltage ORing circuit, the negative input terminal and negative output terminal of each main power circuit are connected to each other, and the positive output terminal of each main power circuit is set independently.

[0010] Optionally, in the high-voltage ORing circuit described above, the ORing controller in the main power circuit is set to floating ground.

[0011] Optionally, in the above-mentioned high-voltage ORing circuit, the main power circuit includes: an ORing controller, a switching transistor, a resistor, a capacitor, the sampling circuit, the voltage divider circuit, and the DC / DC auxiliary power supply circuit;

[0012] The IN terminal of the ORing controller is connected to the first terminal of the sampling circuit, the GND terminal of the ORing controller, one end of the capacitor, and the negative output terminal of the DC / DC auxiliary power supply circuit, respectively, and the connection point is connected to the positive input terminal of the main power circuit; the second terminal of the sampling circuit and the first terminal of the voltage divider circuit are respectively connected to the source of the switching transistor, and the drain of the switching transistor is respectively connected to the second terminal of the voltage divider circuit and the positive input terminal of the DC / DC auxiliary power supply circuit, and the connection point is connected to the positive output terminal of the main power circuit; the OUT terminal of the ORing controller is connected to the third terminal of the voltage divider circuit; the GATE terminal of the ORing controller is connected to the gate of the switching transistor; the VDD terminal of the ORing controller is connected to the other end of the capacitor and one end of the resistor, and the other end of the resistor is connected to the positive output terminal of the DC / DC auxiliary power supply circuit; the negative input terminal of the DC / DC auxiliary power supply circuit is connected to the negative input terminal and the negative output terminal of the main power circuit.

[0013] In the high-voltage ORing circuit described above, the sampling circuit includes a sampling resistor, one end of which serves as the first terminal of the sampling circuit, and the other end of which serves as the second terminal of the sampling circuit.

[0014] The voltage divider circuit includes: a first voltage divider resistor and a second voltage divider resistor, one end of the first voltage divider resistor serves as the first terminal of the voltage divider circuit; the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor, and the connection point serves as the third terminal of the voltage divider circuit; the other end of the second voltage divider resistor serves as the second terminal of the voltage divider circuit.

[0015] Optionally, in the above-mentioned high-voltage ORing circuit, the main power circuit further includes: an input short-circuit clamping circuit, the first end of which is connected to the connection point of the GND terminal of the ORing controller, the capacitor and the negative output terminal of the DC / DC auxiliary power supply circuit, and the second end of which is connected to the IN terminal of the ORing controller.

[0016] Optionally, in the above-mentioned high-voltage ORing circuit, the input short-circuit clamping circuit includes a diode, wherein the anode of the diode serves as the first terminal of the input short-circuit clamping circuit, and the cathode of the diode serves as the second terminal of the input short-circuit clamping circuit.

[0017] Optionally, in the above-mentioned high-voltage ORing circuit, the number of DC / DC auxiliary power supply circuits is the same as the number of ORing controllers and the number of main power circuits in the high-voltage ORing circuit.

[0018] Optionally, in the above-mentioned high-voltage ORing circuit, the number of DC / DC auxiliary power supply circuits, the number of main power circuits, and the number of ORing controllers in the high-voltage ORing circuit are all 2.

[0019] The second aspect of this application discloses a power supply system, such as the high-voltage ORing circuit described in any of the claims of the first aspect.

[0020] The high-voltage ORing circuit provided in this application includes: N main power circuits, where N is a positive integer greater than or equal to 2; each main power circuit is equipped with a DC / DC auxiliary power supply circuit, a sampling circuit, and a voltage divider circuit. The output terminals of each DC / DC auxiliary power supply circuit are isolated from each other. Since the DC / DC auxiliary power supply circuit can provide auxiliary power to the ORing controller of the corresponding main power circuit, the output terminals of each DC / DC auxiliary power supply circuit are isolated from each other. Through circuit isolation, the limit of the ORing controller's maximum withstand voltage of 100V is broken, ensuring that the ORing circuit can be used in high-voltage circuits above 300V, greatly expanding the application scenarios of the ORing circuit. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 Here is a circuit diagram of an existing ORing circuit;

[0023] Figure 2 This is a schematic diagram of a high-voltage ORing circuit provided in an embodiment of this application;

[0024] Figure 3 A circuit diagram of a high-voltage ORing circuit provided in this application embodiment;

[0025] Figure 4 This is a schematic diagram of another high-voltage ORing circuit provided in an embodiment of this application;

[0026] Figure 5 A circuit diagram of another high-voltage ORing circuit provided in this application embodiment;

[0027] Figure 6 A waveform diagram of the input current and voltage of the main power circuit during normal operation, provided for an embodiment of this application;

[0028] Figure 7 The waveforms of the input voltage, output voltage, and current of the main power circuit during normal operation are provided in an embodiment of this application.

[0029] Figure 8 A waveform diagram of the input voltage and current of the main power circuit when the input of the first main power circuit is short-circuited, provided for an embodiment of this application;

[0030] Figure 9 The waveforms of the input voltage, output voltage, and current of the main power circuit when the input of the first main power circuit is short-circuited, as provided in an embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] This application provides a high-voltage ORing circuit to solve the problem that existing ORing circuit solutions are only applicable to low-voltage circuits below 100V and cannot be applied to high-voltage circuits.

[0033] Please see Figure 2 The high-voltage ORing circuit mainly includes: N main power circuits, where N is a positive integer greater than or equal to 2; each main power circuit is equipped with a DC / DC auxiliary power supply circuit, a sampling circuit and a voltage divider circuit, and the output terminals of each DC / DC auxiliary power supply circuit are isolated from each other.

[0034] Combination Figure 2 It is understood that the high-voltage ORing circuit includes multiple main power circuits. Each main power circuit is equipped with a corresponding DC / DC auxiliary power supply circuit for circuit isolation, a corresponding sampling circuit for voltage sampling, and a corresponding voltage divider circuit for voltage division processing to ensure the normal operation of the ORing controller in the high-voltage ORing circuit.

[0035] In some embodiments, the number of DC / DC auxiliary power supply circuits is consistent with the number of ORing controllers in the high-voltage ORing circuit and the number of main power circuits. Each main power circuit includes a corresponding ORing controller.

[0036] In practical applications, such as Figure 2 As shown, the number of DC / DC auxiliary power supply circuits, the number of main power circuits, and the number of ORing controllers in the high-voltage ORing circuit are all 2; of course, it is not limited to this, and can be determined according to the application environment and user needs. This application does not limit it, and all of them are within the protection scope of this application.

[0037] In some embodiments, such as Figure 2 As shown, the negative input and negative output terminals of each main power circuit are connected accordingly, as are the positive output terminals. The positive input terminals of each main power circuit are set independently. That is, the negative input and negative output terminals of each main power circuit are connected, the positive output terminals of each main power circuit are connected, and the positive input terminals of each main power circuit are independent of each other.

[0038] It should be noted that the main power circuits in the high-voltage ORing circuit have the same structure. For ease of explanation, this application mainly focuses on one main power circuit. Multiple main power circuits can be referred to each other and will not be described in detail here.

[0039] See also Figure 2 (Two main power circuits are shown), and in some embodiments, the main power circuit mainly includes: an ORing controller ( Figure 2 U1, U2), switching transistors ( Figure 2 Q1, Q2), resistor ( Figure 2 R4, R8, and capacitors (in the middle) Figure 2 C1, C2), sampling circuit ( Figure 2 Sampling circuit 1, sampling circuit 2), voltage divider circuit ( Figure 2 Voltage divider circuit 1 and voltage divider circuit 2) and DC / DC auxiliary power supply circuit (in the middle) Figure 2 The first DC / DC auxiliary power supply circuit and the second DC / DC auxiliary power supply circuit are shown in the figure.

[0040] The ORing controller's IN terminal is connected to the first terminal of the sampling circuit, the GND terminal of the ORing controller, one end of the capacitor, and the negative output terminal of the DC / DC auxiliary power supply circuit, with the connection point connected to the positive input terminal of the main power circuit. The second terminal of the sampling circuit and the first terminal of the voltage divider circuit are connected to the source of the switching transistor, and the drain of the switching transistor is connected to the second terminal of the voltage divider circuit and the positive input terminal of the DC / DC auxiliary power supply circuit, with the connection point connected to the positive output terminal of the main power circuit. The ORing controller's OUT terminal is connected to the third terminal of the voltage divider circuit. The ORing controller's GATE terminal is connected to the gate of the switching transistor. The ORing controller's VDD terminal is connected to the other end of the capacitor and one end of the resistor, with the other end of the resistor connected to the positive output terminal of the DC / DC auxiliary power supply circuit. The negative input terminal of the DC / DC auxiliary power supply circuit is connected to the negative input terminal and the negative output terminal of the main power circuit.

[0041] In practical applications, the DC / DC auxiliary power supply circuit is a mature existing flyback circuit. It supplies power through the positive output of the main power circuit and provides auxiliary power to the ORing controller. The DC / DC auxiliary power supply circuit can convert the high voltage at the positive output of the main power circuit into the low voltage required by the ORing controller, such as 27V. The low voltage outputs of each DC / DC auxiliary power supply circuit are isolated from each other.

[0042] In practical applications, the switching transistor can be an NMOS transistor with a body diode, that is... Figure 2 As shown; of course, it is not limited to this, and can also be other existing high-pressure pipes. This application does not limit the specific type of them, and they are all within the protection scope of this application.

[0043] In practical applications, combined with Figure 2 The ORing controller can be set to floating ground, that is, the GND terminal of the ORing controller is connected to the negative output terminal of the corresponding DC / DC auxiliary power supply circuit and the positive input terminal of the main power circuit, ensuring that the ORing controller can still drive the switching transistor in the high voltage circuit normally under low voltage power supply conditions.

[0044] In some embodiments, such as Figure 3 As shown, the sampling circuit mainly includes: sampling resistors (R1 and R5 in the figure), one end of the sampling resistor serves as the first terminal of the sampling circuit, and the other end of the sampling resistor serves as the second terminal of the sampling circuit.

[0045] In practical applications, the sampling resistor is used to replace the R of the switching transistor. DS(When the load current flows through the sampling resistor, a voltage drop is generated. After the IN and OUT terminals of the ORing controller detect the voltage difference, the GATE terminal is driven to turn on the switching transistor. When the reverse current flows through the sampling resistor, the ORing controller detects that the voltage difference between the IN and OUT terminals drops below -25mV, and quickly turns off the switching transistor through the strong pull-down of the GATE terminal.

[0046] In some embodiments, the same applies. Figure 3 As shown, the voltage divider circuit mainly includes: a first voltage divider resistor (R2, R6 in the figure) and a second voltage divider resistor (R3, R7 in the figure). One end of the first voltage divider resistor serves as the first terminal of the voltage divider circuit; the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor, and the connection point serves as the third terminal of the voltage divider circuit; the other end of the second voltage divider resistor serves as the second terminal of the voltage divider circuit.

[0047] In practical applications, by using the first and second voltage divider resistors, it is possible to ensure that the IN and OUT terminals of the ORing controller will not be subjected to high voltage when the main power circuit input is short-circuited, while providing a negative voltage difference to ensure that the switching transistor remains off.

[0048] In the technical solutions disclosed in the embodiments of this application, the ORing controller can be a common product on the market, with a withstand voltage limit of 100V. Taking a two-channel main power circuit (for ease of understanding and distinction, the two main power circuits are respectively named the first main power circuit and the second main power circuit) as an example, combined with... Figure 3 The first main power circuit includes: a switching transistor Q1, a sampling resistor R1, a first voltage divider resistor R2, a second voltage divider resistor R3, a resistor R4, an ORing controller U1, and a capacitor C1. The IN and GND terminals of the ORing controller U1, one end of capacitor C1, the negative output terminal SGND1 of the first DC / DC auxiliary power supply circuit, and one end of the sampling resistor R1 are connected to the positive input terminal VIN1+ of the first main power circuit. The other end of the sampling resistor R1 is connected to one end of the first voltage divider resistor R2 and then connected to the source of the switching transistor Q1. The other end of the first voltage divider resistor R2 is connected to one end of the second voltage divider resistor R3 and then connected to the OUT terminal of the ORing controller U1. The other end of the second voltage divider resistor R3 is connected to the drain of the switching transistor Q1 and then connected to the positive output terminal VOUT+ of the first main power circuit. The gate of the switching transistor Q1 is connected to the GATE terminal of the ORing controller U1. The other end of the capacitor C1 is connected to one end of the resistor R4 and then connected to the VDD terminal of the ORing controller U1. The other end of the resistor R4 is connected to the positive output terminal VCC1 of the first DC / DC auxiliary power supply circuit.

[0049] The second main power circuit includes: a switching transistor Q2, a sampling resistor R5, a first voltage divider resistor R6, a second voltage divider resistor R7, a resistor R8, an ORing controller U2, and a capacitor C2. The IN and GND terminals of the ORing controller U2, one end of capacitor C2, the negative output terminal SGND1 of the second DC / DC auxiliary power supply circuit, and one end of the sampling resistor R5 are connected to the positive input terminal VIN2+ of the second main power circuit. The other end of the sampling resistor R5 is connected to one end of the first voltage divider resistor R6 and then connected to the source of the switching transistor Q2. The other end of the first voltage divider resistor R6 is connected to one end of the second voltage divider resistor R7... The other end of the second voltage divider resistor R7 is connected to the OUT terminal of the ORing controller U2. After connecting the other end of the second voltage divider resistor R7 to the drain of the switching transistor Q2, it is connected to the positive output terminal VOUT+ of the second main power circuit. The gate of the switching transistor Q2 is connected to the GATE terminal of the ORing controller U2. After connecting the other end of the capacitor C2 to the GND terminal of the ORing controller U2, it is connected to the negative output terminal SGND2 of the second DC / DC auxiliary power circuit. After connecting the other end of the capacitor C2 to one end of the resistor R8, it is connected to the VDD terminal of the ORing controller U2. The other end of the resistor R8 is connected to the positive output terminal VCC2 of the second DC / DC auxiliary power circuit.

[0050] That is, the negative input terminals of the two main power circuits are connected together, the positive output terminals are connected together, and the negative output terminals are connected together; the positive input terminals of the two DC / DC auxiliary power circuits are connected to the positive output terminal of the main power circuit, and the negative input terminals are connected to the negative output terminal of the main power circuit, with the output terminals isolated from each other.

[0051] The specific working process of the high-voltage ORing circuit described above is as follows:

[0052] For the first main power circuit, after the 270V voltage is established at the positive input terminal, the ORing controller U1 in the first main power circuit has not yet started working. The switching transistor Q1 in the first main power circuit is in an off state, and the current flows through the body diode of the switching transistor Q1 to the output terminal of the first main power circuit, which is the positive output terminal of the aforementioned main power circuit. The 270V voltage is established at the positive input terminal of the first DC / DC auxiliary power supply circuit. After power conversion, a 27V voltage is output to the VDD terminal of the ORing controller U1 through the positive output terminal of the first DC / DC auxiliary power supply circuit. The ORing controller U1 in the first main power circuit then starts working, and the first main power circuit enters the working state.

[0053] For the second main power circuit, after the 270V voltage is established at its positive input terminal, the ORing controller U2 in the second main power circuit has not yet started working, and the switching transistor Q2 is in an off state. Current flows through the body diode of the switching transistor Q2 to the output terminal of the second main power circuit, which is the positive output terminal of the aforementioned main power circuit. The 270V voltage is then established at the positive input terminal of the second DC / DC auxiliary power supply circuit. After power conversion, a 27V voltage is output to the VDD terminal of the ORing controller U2 through the positive output terminal of the second DC / DC auxiliary power supply circuit. The ORing controller in the second main power circuit then starts working, and the second main power circuit enters its operating state.

[0054] After the switching transistor Q1 in the first main power circuit is turned off, the voltage is divided by the second voltage divider resistor R3, the sampling resistor R1, and the first voltage divider resistor R2. The IN and OUT terminals of the ORing controller U1 in the first main power circuit will not be subjected to high voltage and will maintain a certain negative voltage value, ensuring that the ORing controller U1 in the first main power circuit can continuously turn off the switching transistor until the input of the first main power circuit returns to normal.

[0055] It should be noted that after the current flows from the positive input terminal of the first main power circuit through the sampling resistor R1, a very small portion flows through the first voltage divider resistor R2 into the OUT terminal of the ORing controller U1 in the first main power circuit, generating a certain voltage drop. By adjusting the resistance value of the first voltage divider resistor R2, it can be ensured that the voltage difference between the IN terminal and the OUT terminal of the ORing controller U1 is greater than 25mV. At this time, the gate drive of the switching transistor Q1 in the first main power circuit will be fully turned on, and the voltage of the GATE terminal of the ORing controller U1 in the first main power circuit is 12V relative to its IN terminal. That is, the GS voltage of the switching transistor Q1 in the first main power circuit is 12V, the switching transistor Q1 in the first main power circuit is fully turned on, and the first main power circuit operates normally.

[0056] Similarly, after the current flows from the positive input terminal of the second main power circuit through the sampling resistor R5, a very small portion flows through the first voltage divider resistor R6 into the OUT terminal of the ORing controller U2 in the second main power circuit, generating a certain voltage drop. By adjusting the resistance value of the first voltage divider resistor R6, it can be ensured that the voltage difference between the IN terminal and the OUT terminal of the ORing controller U2 is greater than 25mV. At this time, the gate drive of the switching transistor Q2 in the second main power circuit will be fully turned on, and the voltage of the GATE terminal of the ORing controller U2 in the second main power circuit is 12V relative to its IN terminal. That is, the GS voltage of the switching transistor Q2 in the second main power circuit is 12V, the switching transistor Q2 in the second main power circuit is fully turned on, and the second main power circuit operates normally.

[0057] Based on the above principles, the high-voltage ORing circuit provided in this embodiment includes: N main power circuits, where N is a positive integer greater than or equal to 2; each main power circuit is equipped with a DC / DC auxiliary power supply circuit, a sampling circuit, and a voltage divider circuit. The output terminals of each DC / DC auxiliary power supply circuit are isolated from each other. Since the DC / DC auxiliary power supply circuit can convert high voltage into low voltage to provide auxiliary power to the ORing controller of the corresponding main power circuit, and the output terminals of each DC / DC auxiliary power supply circuit are isolated from each other, the circuit isolation breaks the limit of the ORing controller's maximum withstand voltage of 100V, ensuring that the ORing circuit can be used in high-voltage circuits above 300V, greatly expanding the application scenarios of the ORing circuit.

[0058] Optionally, in another embodiment provided in this application, the main power circuit of the high-voltage ORing circuit further includes: an input short-circuit clamping circuit ( Figure 4 Input short-circuit clamping circuit 1 and input short-circuit clamping circuit 2 (in the circuit).

[0059] In some embodiments, such as Figure 4 As shown, the first terminal of the input short-circuit clamping circuit is connected to the GND terminal of the ORing controller, the capacitor, and the negative output terminal of the DC / DC auxiliary power supply circuit. The second terminal of the input short-circuit clamping circuit is connected to the IN terminal of the ORing controller and the positive input terminal of the main power circuit.

[0060] Combination Figure 5 The input short-circuit clamping circuit mainly includes: diodes (D1 and D2 in the figure), with the anode of the diode serving as the first terminal of the input short-circuit clamping circuit and the cathode of the diode serving as the second terminal of the input short-circuit clamping circuit.

[0061] In practical applications, after setting up an input short-circuit clamping circuit in the main power circuit, the characteristics of the diode can be used to clamp the circuit at the moment of input short circuit in the main power circuit, ensuring that the ORing controller will not be damaged by high voltage.

[0062] Based on the above, taking a two-channel main power circuit (for ease of understanding and distinction, the two main power circuits are named the first main power circuit and the second main power circuit, respectively) as an example, both main power circuits are equipped with input short-circuit clamping circuits. The first main power circuit includes: diode D1, switching transistor Q1, sampling resistor R1, first voltage divider resistor R2, second voltage divider resistor R3, resistor R4, ORing controller U1, and capacitor C1; wherein, the IN terminal of ORing controller U1 is connected to one end of sampling resistor R1 and the cathode of diode D1, and then connected to the positive input terminal VIN1+ of the first main power circuit; the other end of sampling resistor R1 is connected to one end of the first voltage divider resistor R2, and then connected to the source of switching transistor Q1. The other end of the voltage divider resistor R2 is connected to one end of the second voltage divider resistor R3 and then connected to the OUT terminal of the ORing controller U1. The other end of the second voltage divider resistor R3 is connected to the drain of the switching transistor Q1 and then connected to the positive output terminal VOUT+ of the first main power circuit. The gate of the switching transistor Q1 is connected to the GATE terminal of the ORing controller U1. The anode of the diode D1, one end of the capacitor C1, and the GND terminal of the ORing controller U1 are connected to the negative output terminal SGND1 of the first DC / DC auxiliary power supply circuit. The other end of the capacitor C1 is connected to one end of the resistor R4 and then connected to the VDD terminal of the ORing controller U1. The other end of the resistor R4 is connected to the positive output terminal VCC1 of the first DC / DC auxiliary power supply circuit.

[0063] The second main power circuit includes: diode D2, switching transistor Q2, sampling resistor R5, first voltage divider resistor R6, second voltage divider resistor R7, resistor R8, ORing controller U2, and capacitor C2. The IN terminal of the ORing controller U2 is connected to the positive input terminal VIN2+ of the second main power circuit by connecting one end of the sampling resistor R5 and the cathode of diode D2. The other end of the sampling resistor R5 is connected to the source of the switching transistor Q2 by connecting one end of the first voltage divider resistor R6. The other end of the first voltage divider resistor R6 is connected to the source of the switching transistor Q2 by connecting one end of the second voltage divider resistor R7. The other end of the second voltage divider resistor R7 is connected to the drain of the switching transistor Q2 and then connected to the positive output terminal VOUT+ of the second main power circuit. The gate of the switching transistor Q2 is connected to the GATE terminal of the ORing controller U2. The anode of the diode D2, one end of the capacitor C2, and the GND terminal of the ORing controller U2 are connected to the negative output terminal SGND2 of the second DC / DC auxiliary power supply circuit. The other end of the capacitor C2 is connected to one end of the resistor R8 and then connected to the VDD terminal of the ORing controller U2. The other end of the resistor R8 is connected to the positive output terminal VCC2 of the second DC / DC auxiliary power supply circuit.

[0064] That is, the negative input terminals of the two main power circuits are connected together, the positive output terminals are connected together, and the negative output terminals are connected together; the positive input terminals of the two DC / DC auxiliary power circuits are connected to the positive output terminal of the main power circuit, and the negative input terminals are connected to the negative output terminal of the main power circuit, with the output terminals isolated from each other.

[0065] The specific working process of the aforementioned high-voltage ORing circuit is as follows:

[0066] In the event of a failure in one of the main power circuits, such as a sudden short circuit to ground at the input of the first main power circuit, the GND voltage of the ORing controller U1 in the first main power circuit is clamped to 1.3V through diode D1. The VDD voltage relative to the GND voltage of the ORing controller U1 in the first main power circuit remains 27V, and the ORing controller U1 in the first main power circuit can still operate normally. The GATE voltage relative to the IN voltage of the ORing controller U1 in the first main power circuit remains 12V, and the switching transistor Q1 in the first main power circuit is fully turned on. Current will temporarily flow through the body of the switching transistor Q2 in the second main power circuit. The diode is reverse-fed into the positive input terminal VIN+ of the first main power circuit through the conducting switch Q1. The reverse current flows through the sampling resistor R1 and generates a voltage drop. As the reverse current increases, the voltage drop also increases. When the ORing controller U1 detects that the voltage difference between the IN and OUT terminals exceeds -25mV, it will react quickly and turn off the switch Q1 within 0.5us to prevent the reverse current from continuing to increase, thereby isolating the first main power circuit. At the same time, the ORing controller U2 in the second main power circuit detects that the voltage difference between the IN and OUT terminals exceeds 25mV, and the switch Q2 in the second main power circuit turns on to achieve uninterrupted current switching.

[0067] In summary, combined with Figure 5 Similarly, taking a two-way main power circuit (for ease of understanding and distinction, the two main power circuits are named the first main power circuit and the second main power circuit, respectively) as an example, the circuit waveforms and related descriptions of the high-voltage ORing circuit provided in this application under various operating conditions are as follows:

[0068] Figure 6The diagram shows the waveforms of the input current and voltage of the main power circuit during normal operation. Channel 1 represents the input voltage of the first main power circuit, channel 2 represents the input current of the first main power circuit, channel 3 represents the input voltage of the second main power circuit, and channel 4 represents the input current of the second main power circuit. When the input voltage of the first main power circuit is higher than that of the second main power circuit, the switch Q1 in the first main power circuit is turned on, and the switch Q2 in the second main power circuit is turned off, with all the main power current supplied by the first main power circuit. When the input voltage of the first main power circuit drops below that of the second main power circuit, current flows back into the first main power circuit from the body diode of the switch Q2 in the second main power circuit. The ORing controller U1 in the first main power circuit detects the negative voltage difference, and the switch Q1 in the first main power circuit turns off. The ORing controller U2 in the second main power circuit detects the voltage difference, and the switch Q2 in the second main power circuit turns on, with all the main power current supplied by the second main power circuit.

[0069] Figure 7 The diagram shows the waveforms of the input voltage, output voltage, and current of the main power circuit during normal operation. Channel 1 represents the input voltage of the first main power circuit, channel 2 represents the input voltage of the second main power circuit, channel 3 represents the output voltage of the main power circuit, and channel 4 represents the output current of the main power circuit. When the input voltage of the first main power circuit is higher than that of the second main power circuit, the output voltage of the main power circuit follows the input voltage of the first main power circuit. When the input voltage of the first main power circuit drops below that of the second main power circuit, the output of the main power circuit remains uninterrupted, and the voltage follows the input voltage of the second main power circuit. The load is a purely resistive load, and the output current of the main power circuit changes with the output voltage of the main power circuit.

[0070] Figure 8The waveforms of the input voltage and current of the first main power circuit when the input is short-circuited are shown. Channel 1 represents the input voltage of the first main power circuit, Channel 2 represents the input current of the first main power circuit, Channel 3 represents the input voltage of the second main power circuit, and Channel 4 represents the input current of the second main power circuit. The input voltage of the first main power circuit is higher than that of the second main power circuit. The switching transistor in the first main power circuit is in the ON state, while the switching transistor in the second main power circuit is in the OFF state. All main power current is provided by the first main power circuit. When the input of the first main power circuit is short-circuited, current flows back from the body diode of the switching transistor Q2 in the second main power circuit to the first main power circuit. The ORing controller U1 in the first main power circuit detects the negative voltage difference, and the switching transistor Q1 in the first main power circuit turns off. The ORing controller U2 in the second main power circuit detects the voltage difference, and the switching transistor Q2 in the second main power circuit turns on. All main power current is provided by the second main power circuit. The change in the input voltage of the first main power circuit is determined by the short-circuit protection characteristic of the input power supply in the first main power circuit.

[0071] Figure 9 The diagram shows the waveforms of the input voltage, output voltage, and current of the first main power circuit when its input is short-circuited. Channel 1 represents the input voltage of the first main power circuit, channel 2 represents the input voltage of the second main power circuit, channel 3 represents the output voltage of the main power circuit, and channel 4 represents the output current of the main power circuit. The input voltage of the first main power circuit is higher than that of the second main power circuit, and the output voltage of the main power circuit follows the input voltage of the first main power circuit. When the input of the first main power circuit is short-circuited, the output of the main power circuit is uninterrupted, and the voltage changes with the output voltage of the second main power circuit.

[0072] Based on the high-voltage ORing circuit provided in the above embodiments, alternatively, another embodiment of this application also provides a power supply system, which includes: the high-voltage ORing circuit as provided in any of the above embodiments.

[0073] In practical applications, the relevant descriptions of the high-voltage ORing circuit can be found in the above embodiments, and will not be repeated here; the relevant descriptions of the power supply system can be found in the prior art, and will not be repeated here either.

[0074] The power supply system provided in this embodiment includes a high-voltage ORing circuit. Since the main power circuit in the high-voltage ORing circuit is equipped with a DC / DC auxiliary power supply circuit, a sampling circuit and a voltage divider circuit, the output terminals of each DC / DC auxiliary power supply circuit are isolated from each other. Through circuit isolation, the limit of the ORing controller's maximum withstand voltage of 100V is broken, ensuring that the ORing circuit can be used in high-voltage circuits above 300V, which greatly expands the application scenarios of the ORing circuit and also makes the power supply system suitable for high-voltage scenarios.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0076] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A high-voltage ORing circuit, characterized in that, include: N main power circuits, where N is a positive integer greater than or equal to 2; Each of the main power circuits is equipped with a DC / DC auxiliary power supply circuit, a sampling circuit, and a voltage divider circuit. The output terminals of each DC / DC auxiliary power supply circuit are isolated from each other.

2. The high-voltage ORing circuit according to claim 1, characterized in that, The negative input and negative output terminals of each main power circuit are connected to each other, as are the positive output terminals, and the positive input terminal of each main power circuit is set independently.

3. The high-voltage ORing circuit according to claim 1, characterized in that, The ORing controller in the main power circuit is set to floating ground.

4. The high-voltage ORing circuit according to claim 2, characterized in that, The main power circuit includes: an ORing controller, a switching transistor, a resistor, a capacitor, the sampling circuit, the voltage divider circuit, and the DC / DC auxiliary power supply circuit; The IN terminal of the ORing controller is connected to the first terminal of the sampling circuit, the GND terminal of the ORing controller, one end of the capacitor, and the negative output terminal of the DC / DC auxiliary power supply circuit, respectively, and the connection point is connected to the positive input terminal of the main power circuit; the second terminal of the sampling circuit and the first terminal of the voltage divider circuit are respectively connected to the source of the switching transistor, and the drain of the switching transistor is respectively connected to the second terminal of the voltage divider circuit and the positive input terminal of the DC / DC auxiliary power supply circuit, and the connection point is connected to the positive output terminal of the main power circuit; the OUT terminal of the ORing controller is connected to the third terminal of the voltage divider circuit; the GATE terminal of the ORing controller is connected to the gate of the switching transistor; the VDD terminal of the ORing controller is connected to the other end of the capacitor and one end of the resistor, and the other end of the resistor is connected to the positive output terminal of the DC / DC auxiliary power supply circuit; the negative input terminal of the DC / DC auxiliary power supply circuit is connected to the negative input terminal and the negative output terminal of the main power circuit.

5. The high-voltage ORing circuit according to claim 4, characterized in that, The sampling circuit includes: a sampling resistor, one end of which serves as a first terminal of the sampling circuit, and the other end of which serves as a second terminal of the sampling circuit; The voltage divider circuit includes: a first voltage divider resistor and a second voltage divider resistor, one end of the first voltage divider resistor serves as the first terminal of the voltage divider circuit; the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor, and the connection point serves as the third terminal of the voltage divider circuit; the other end of the second voltage divider resistor serves as the second terminal of the voltage divider circuit.

6. The high-voltage ORing circuit according to claim 4, characterized in that, The main power circuit further includes an input short-circuit clamping circuit, the first end of which is connected to the connection point of the GND terminal of the ORing controller, the capacitor, and the negative output terminal of the DC / DC auxiliary power supply circuit, and the second end of which is connected to the connection point of the IN terminal of the ORing controller and the positive input terminal of the main power circuit.

7. The high-voltage ORing circuit according to claim 6, characterized in that, The input short-circuit clamping circuit includes a diode, wherein the anode of the diode serves as the first terminal of the input short-circuit clamping circuit, and the cathode of the diode serves as the second terminal of the input short-circuit clamping circuit.

8. The high-voltage ORing circuit according to any one of claims 1-7, characterized in that, The number of DC / DC auxiliary power supply circuits is the same as the number of ORing controllers in the high-voltage ORing circuit and the number of main power circuits.

9. The high-voltage ORing circuit according to claim 8, characterized in that, The number of DC / DC auxiliary power supply circuits, the number of main power circuits, and the number of ORing controllers in the high-voltage ORing circuit are all 2.

10. A power supply system, characterized in that, The high-voltage ORing circuit as described in any one of claims 1-9.

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