Power supply system and high-voltage ORing circuit
By introducing a DC/DC auxiliary power supply circuit, a sampling circuit, and a voltage divider circuit into the ORing circuit, the normal operation of the high-voltage ORing circuit is realized, solving the problem that the existing technology can only be used for low-voltage circuits, and improving the reliability and efficiency of the system.
Patent Information
- Application Number
- CN202421055714.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-15
AI Technical Summary
Existing ORing circuit solutions are only suitable for low-voltage circuits below 100V and cannot be used in high-voltage circuits, resulting in problems such as heat generation, power loss and safety hazards in high-voltage applications.
Design a high-voltage ORing circuit, including N main power circuits. 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. The high voltage is converted into low voltage through the DC/DC auxiliary power supply circuit to supply the ORing controller, breaking the limit of 100V of the ORing controller's withstand voltage.
It enables the ORing circuit to operate normally in high-voltage circuits above 300V, reduces heat generation and power loss, expands the application scenarios of the ORing circuit, and improves the reliability and efficiency of the system.
Smart Images
Figure CN222339264U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic circuits, and in particular to a power supply system and a high-voltage ORing circuit. Background Art
[0002] In power supply design, in order to improve the reliability of the system, a redundant design scheme is often adopted, that is, multiple identical DC / DC converters are designed in the power supply system. When one of the DC / DC converters fails and has no output, the remaining DC / DC converters can still ensure the normal operation of the system. Currently, there are two redundant design schemes: diode scheme and ORing circuit scheme.
[0003] The diode solution is to connect each DC / DC converter to the common output terminal through a diode. By using the unidirectional conductivity of the diode, when a DC / DC converter has a short circuit or other fault, the fault can be quickly isolated to ensure the normal operation of the system. However, due to the inherent conduction voltage drop of the diode itself, it has problems such as heating and severe power loss in high-power applications. Especially in high-voltage circuits, the conduction voltage drop of the high-voltage diode will be greater, and the heating and power loss phenomenon will be more prominent. Therefore, it will cause safety hazards and low efficiency in the system.
[0004] The ORing circuit solution uses MOS tubes instead of diodes. The conduction voltage drop of MOS tubes is much lower than that of diodes. Compared with the diode solution, the ORing circuit solution reduces power loss and heat generation, greatly improving system efficiency. It is the most common solution available, such as Figure 1 However, the maximum withstand voltage of most ORing controllers on the market is 100V, which means that the general ORing circuit solution can only be applied to low-voltage circuits below 100V. Utility Model Content
[0005] In this regard, the present application provides a power supply system and a high-voltage ORing circuit to solve the problem that the existing ORing circuit solution is only applicable to low-voltage circuits below 100V and cannot be applied to high-voltage circuits.
[0006] To achieve the above objectives, the present application provides the following technical solutions:
[0007] In a first aspect, the present application discloses a high-voltage ORing circuit, comprising: N main power circuits, where N is a positive integer greater than or equal to 2;
[0008] Each of the main power circuits is provided with a DC / DC auxiliary power supply circuit, a sampling circuit and a voltage divider circuit, and the output ends of the DC / DC auxiliary power supply circuits are isolated from each other.
[0009] Optionally, in the above-mentioned high-voltage ORing circuit, the negative input terminal and the negative output terminal and the positive output terminal of each main power circuit are correspondingly connected, and the positive input terminal of each main power circuit is independently set.
[0010] Optionally, in the above-mentioned high-voltage ORing circuit, the ORing controller in the main power circuit adopts a floating setting.
[0011] Optionally, in the above-mentioned high-voltage ORing circuit, the main power circuit includes: an ORing controller, a switch tube, 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 respectively connected to the first terminal of the sampling circuit, the GND terminal of the ORing controller, one terminal of the capacitor and the negative output terminal of the DC / DC auxiliary power supply circuit, 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 switch tube, the drain of the switch tube 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 switch tube; the VDD terminal of the ORing controller is respectively connected to the other terminal of the capacitor and one terminal of the resistor, and the other terminal 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 respectively connected to the negative input terminal and the negative output terminal of the main power circuit.
[0013] In the above-mentioned high-voltage ORing circuit, the sampling circuit comprises: a sampling resistor, one end of the sampling resistor serves as the first end of the sampling circuit, and the other end of the sampling resistor serves as the second end of the sampling circuit;
[0014] The voltage-dividing circuit includes: a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor serves as the first end of the voltage-dividing circuit; the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor, and the connection point serves as the third end of the voltage-dividing circuit; the other end of the second voltage-dividing resistor serves as the second end of the voltage-dividing circuit.
[0015] Optionally, in the above-mentioned high-voltage ORing circuit, the main power circuit also includes: an input short-circuit clamp circuit, a first end of the input short-circuit clamp circuit is connected to the GND end of the ORing controller, the capacitor and the connection point of the negative output end of the DC / DC auxiliary power supply circuit, and a second end of the input short-circuit clamp circuit is connected to the IN end of the ORing controller.
[0016] Optionally, in the above-mentioned high-voltage ORing circuit, the input short-circuit clamping circuit includes: a diode, an anode of the diode serving as a first end of the input short-circuit clamping circuit, and a cathode of the diode serving as a second end of the input short-circuit clamping circuit.
[0017] Optionally, in the above-mentioned high-voltage ORing circuit, the number of the DC / DC auxiliary power supply circuits is consistent with the number of ORing controllers in the high-voltage ORing circuit and the number of the main power circuits.
[0018] Optionally, in the above-mentioned high-voltage ORing circuit, the number of the DC / DC auxiliary power supply circuits, the number of the main power circuits, and the number of ORing controllers in the high-voltage ORing circuit are all 2.
[0019] A second aspect of the present application discloses a power supply system, such as the high-voltage ORing circuit as described in any one of the items disclosed in the first aspect.
[0020] The high-voltage ORing circuit provided in the present application includes: N main power circuits, where 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 divider circuit, and the output ends of the DC / DC auxiliary power supply circuits are isolated from each other. Since the DC / DC auxiliary power supply circuit can provide auxiliary power for the ORing controller corresponding to the main power circuit, the output ends of the DC / DC auxiliary power supply circuits 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. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0022] Figure 1 A circuit diagram of an existing ORing circuit;
[0023] Figure 2 A schematic diagram of the structure of a high-voltage ORing circuit provided in an embodiment of the present application;
[0024] Figure 3 A circuit diagram of a high-voltage ORing circuit provided in an embodiment of the present application;
[0025] Figure 4 A schematic diagram of the structure of another high-voltage ORing circuit provided in an embodiment of the present application;
[0026] Figure 5 A circuit diagram of another high-voltage ORing circuit provided in an embodiment of the present application;
[0027] Figure 6 A waveform diagram of input current and voltage of a main power circuit during normal operation provided by an embodiment of the present application;
[0028] Figure 7 A waveform diagram of the input voltage, output voltage and current of a main power circuit during normal operation provided by an embodiment of the present application;
[0029] Figure 8 A waveform diagram of input voltage and current of a main power circuit when the input of a first main power circuit is short-circuited provided in an embodiment of the present application;
[0030] Fig. 9 A waveform diagram of the input voltage, output voltage and current of a main power circuit when the input of a first main power circuit is short-circuited provided in an embodiment of the present application. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0032] The embodiment of the present application provides a high-voltage ORing circuit to solve the problem that the existing ORing circuit solution is only applicable to low-voltage circuits below 100V and cannot be applied to high-voltage circuits.
[0033] See also Figure 2 The high-voltage ORing circuit mainly includes: 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 circuit, a sampling circuit and a voltage divider circuit, and the output ends of each DC / DC auxiliary power circuit are isolated from each other.
[0034] Combination Figure 2 It can be 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, wherein 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 also be determined according to the application environment and user needs. This application does not limit it and it is all within the protection scope of this application.
[0037] In some embodiments, Figure 2 As shown, the negative input terminal and the negative output terminal, and the positive output terminal of each main power circuit are connected correspondingly, and the positive input terminal of each main power circuit is independently set. That is, the negative input terminal and the negative output terminal of each main power circuit are connected, the positive output terminal of each main power circuit is connected, and the positive input terminal of each main power circuit is independent of each other.
[0038] It should be noted that the structures of the main power circuits in the high-voltage ORing circuit are the same. For the convenience of explanation, this application mainly revolves around a certain main power circuit. Multiple main power circuits can refer to each other and will not be redundantly described.
[0039] See also Figure 2 (showing two main power circuits), in some embodiments, the main power circuit mainly includes: an ORing controller ( Figure 2 U1, U2 in), switch tube ( Figure 2 Q1, Q2 in), resistors ( Figure 2 R4, R8), capacitor ( Figure 2 C1, C2 in), sampling circuit ( Figure 2 Sampling circuit 1, sampling circuit 2), voltage divider circuit ( Figure 2 Voltage divider circuit 1, voltage divider circuit 2) and DC / DC auxiliary power supply circuit ( Figure 2 The first DC / DC auxiliary power supply circuit and the second DC / DC auxiliary power supply circuit in the embodiment of the present invention are as follows:
[0040] Among them, the IN terminal of the ORing controller is respectively 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, 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 end of the voltage divider circuit are respectively connected to the source of the switching tube, the drain of the switching tube is respectively connected to the second end 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 end of the voltage divider circuit; the GATE terminal of the ORing controller is connected to the gate of the switching tube; the VDD terminal of the ORing controller is respectively 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 respectively 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 an existing mature flyback circuit, which is powered by the positive output terminal of the main power circuit and is used to provide auxiliary power for the ORing controller. The DC / DC auxiliary power supply circuit can convert the high voltage of the positive output terminal of the main power circuit into the low voltage required by the ORing controller, such as 27V voltage, and the low voltages output by each DC / DC auxiliary power supply circuit are isolated from each other.
[0042] In a specific application, the switch tube can be an NMOS tube with a body diode, that is, Figure 2 As shown; of course, it is not limited to this, and it can also be other existing high-pressure pipes. The present application does not limit its specific type, and all are within the protection scope of the present application.
[0043] In specific applications, combined Figure 2 The ORing controller can adopt a floating ground setting, 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 normally drive the switch tube in the high-voltage circuit under low-voltage power supply conditions.
[0044] In some embodiments, Figure 3 As shown, the sampling circuit mainly includes: a sampling resistor (R1, R5 in the figure), one end of the sampling resistor serves as the first end of the sampling circuit, and the other end of the sampling resistor serves as the second end of the sampling circuit.
[0045] In practical applications, the sampling resistor is used to replace the R DS(on)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 switch tube. 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 switch tube through a strong pull-down at the GATE terminal.
[0046] In some embodiments, 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 end 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 end of the voltage divider circuit; the other end of the second voltage divider resistor serves as the second end of the voltage divider circuit.
[0047] In practical applications, the first voltage-dividing resistor and the second voltage-dividing resistor can be used to ensure that the IN and OUT terminals of the ORing controller will not be subjected to high voltage when the input of the main power circuit is short-circuited, and at the same time provide a negative voltage difference to ensure that the switch tube is continuously turned off.
[0048] In the technical solution disclosed in the embodiment of the present application, the ORing controller can be a common product on the market, and its withstand voltage limit is 100V. Take two main power circuits (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, combined with Figure 3 The first main power circuit includes: a switch tube Q1, a sampling resistor R1, a first voltage-dividing resistor R2, a second voltage-dividing resistor R3, a resistor R4, an ORing controller U1, and a capacitor C1; wherein the IN terminal, the GND terminal, one end of the capacitor C1, and the negative output terminal SGND1 of the first DC / DC auxiliary power supply circuit are connected to one end of the sampling resistor R1 and then connected to the positive input terminal VIN1+ of the first main power circuit, and the other end of the sampling resistor R1 is connected to one end of the first voltage-dividing resistor R2 and then connected to the source of the switch tube Q1. The other end of the first voltage-dividing resistor R2 is connected to one end of the second voltage-dividing resistor R3 and then connected to the OUT end of the ORing controller U1. The other end of the second voltage-dividing resistor R3 is connected to the drain of the switch tube Q1 and then connected to the positive output end VOUT+ of the first main power circuit. The gate of the switch tube Q1 is connected to the GATE end 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 end of the ORing controller U1. The other end of the resistor R4 is connected to the positive output end VCC1 of the first DC / DC auxiliary power supply circuit.
[0049] The second main power circuit includes: a switch tube Q2, a sampling resistor R5, a first voltage-dividing resistor R6, a second voltage-dividing resistor R7, a resistor R8, an ORing controller U2, and a capacitor C2; wherein, the IN terminal, the GND terminal, one end of the capacitor C2, and the negative output terminal SGND1 of the second DC / DC auxiliary power supply circuit are connected to one end of the sampling resistor R5 and then 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-dividing resistor R6 and then connected to the source of the switch tube Q2, and the other end of the first voltage-dividing resistor R6 is connected to one end of the second voltage-dividing resistor R7 and then connected to the positive input terminal VIN2+ of the second main power circuit. Connect to the OUT terminal of the ORing controller U2, the other end of the second voltage-dividing resistor R7 is connected to the drain of the switch tube Q2 and then connected to the positive output terminal VOUT+ of the second main power circuit, the gate of the switch tube Q2 is connected to the GATE terminal of the ORing controller U2, the other end of the capacitor C2 is connected to the GND terminal of the ORing controller U2 and then 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, and the other end of the resistor R8 is connected to the positive output terminal VCC2 of the second DC / DC auxiliary power supply circuit.
[0050] That is, the negative input terminals of the two main power circuits are connected, the positive output terminals are connected, and the negative output terminals are connected; the positive input terminals of the two DC / DC auxiliary power supply circuits are connected and then connected to the positive output terminal of the main power circuit, and the negative input terminals are connected and then connected to the negative output terminal of the main power circuit, and the output terminals are isolated from each other.
[0051] For the above-mentioned high-voltage ORing circuit, its specific working process is as follows:
[0052] For the first main power circuit, after the 270V voltage is input to the positive input end of the first main power circuit, the ORing controller U1 in the first main power circuit has not started working, the switch tube Q1 in the first main power circuit is in a non-conducting state, and the current flows to the output end of the first main power circuit through the body diode of the switch tube Q1, that is, the positive output end of the above main power circuit. The 270V voltage is input to the positive input end of the first DC / DC auxiliary power supply circuit, and after power conversion, the 27V voltage is output to the VDD end of the ORing controller U1 through the positive output end of the first DC / DC auxiliary power supply circuit. The ORing controller U1 in the first main power circuit starts working, and the first main power circuit enters the working state.
[0053] For the second main power circuit, after the 270V voltage is input to the positive input end of the second main power circuit, the ORing controller U2 in the second main power circuit has not started working, the switch tube Q2 is in a non-conducting state, and the current flows to the output end of the second main power circuit through the body diode of the switch tube Q2 in the second main power circuit, that is, the positive output end of the above main power circuit. The 270V voltage is input to the positive input end of the second DC / DC auxiliary power supply circuit, and after power conversion, the 27V voltage is output to the VDD end of the ORing controller U2 through the positive output end of the second DC / DC auxiliary power supply circuit. The ORing controller in the second main power circuit starts working, and the second main power circuit enters the working state.
[0054] After the switch tube Q1 in the first main power circuit is turned off, the voltage is divided by the second voltage-dividing resistor R3, the sampling resistor R1, and the first voltage-dividing 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 maintain a certain negative voltage value, thereby ensuring that the ORing controller U1 in the first main power circuit can continuously turn off the switch tube 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 end of the first main power circuit through the sampling resistor R1, a very small part of the current flows into the OUT end of the ORing controller U1 in the first main power circuit through the first voltage-dividing resistor R2, and generates a certain voltage drop. By adjusting the resistance value of the first voltage-dividing resistor R2, it can be ensured that the voltage difference between the IN end and the OUT end of the ORing controller U1 is greater than 25mV. At this time, the gate drive of the switch tube Q1 in the first main power circuit will be fully opened, and the GATE terminal voltage 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 switch tube Q1 in the first main power circuit is 12V, the switch tube 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 end of the second main power circuit through the sampling resistor R5, a very small part of the current flows into the OUT end of the ORing controller U2 in the second main power circuit through the first voltage-dividing resistor R6, and a certain voltage drop is generated. By adjusting the resistance value of the first voltage-dividing resistor R6, it can be ensured that the voltage difference between the IN end and the OUT end of the ORing controller U2 is greater than 25mV. At this time, the gate drive of the switch tube Q2 in the second main power circuit will be fully opened, and the GATE terminal voltage 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 switch tube Q2 in the second main power circuit is 12V, the switch tube Q2 in the second main power circuit is fully turned on, and the second main power circuit operates normally.
[0057] Based on the above principle, the high-voltage ORing circuit provided in this embodiment includes: 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 divider circuit, and the output ends of the DC / DC auxiliary power supply circuits are isolated from each other. Since the DC / DC auxiliary power supply circuit can convert high voltage into low voltage to provide auxiliary power for the ORing controller of the corresponding main power circuit, the output ends of the DC / DC auxiliary power supply circuits 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 by the present application, the main power circuit of the high-voltage ORing circuit further includes: an input short-circuit clamp circuit ( Figure 4 Input short-circuit clamp circuit 1 and input short-circuit clamp circuit 2 in ).
[0059] In some embodiments, Figure 4 As shown, the first end of the input short-circuit clamp circuit is connected to the GND end of the ORing controller, the capacitor and the connection point of the negative output end of the DC / DC auxiliary power supply circuit, and the second end of the input short-circuit clamp circuit is connected to the connection point of the IN end of the ORing controller and the positive input end of the main power circuit.
[0060] Combination Figure 5 The input short-circuit clamp circuit mainly includes: a diode (D1, D2 in the figure), the anode of the diode serves as the first end of the input short-circuit clamp circuit, and the cathode of the diode serves as the second end of the input short-circuit clamp circuit.
[0061] In practical applications, after an input short-circuit clamp circuit is set up in the main power circuit, the characteristics of the diode can be used to clamp the main power circuit at the moment of input short circuit, ensuring that the ORing controller will not be broken down by high voltage.
[0062] In combination with the above, also taking two main power circuits (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 provided with an input short-circuit clamping circuit, and the first main power circuit includes: a diode D1, a switch tube Q1, a sampling resistor R1, a first voltage-dividing resistor R2, a second voltage-dividing resistor R3, a resistor R4, an ORing controller U1, and a capacitor C1; wherein, the IN terminal of the ORing controller U1 is connected to one end of the sampling resistor R1 and the cathode of the diode D1 and then 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-dividing resistor R2 and then connected to the source of the switch tube Q1, and the first voltage-dividing resistor R2 is connected to the source of the switch tube Q1. The other end of the voltage-dividing resistor R2 is connected to one end of the second voltage-dividing resistor R3 and then connected to the OUT end of the ORing controller U1. The other end of the second voltage-dividing resistor R3 is connected to the drain of the switch tube Q1 and then connected to the positive output end VOUT+ of the first main power circuit. The gate of the switch tube Q1 is connected to the GATE end of the ORing controller U1. The anode of the diode D1, one end of the capacitor C1 and the GND end of the ORing controller U1 are connected and then connected to the negative output end 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 end of the ORing controller U1. The other end of the resistor R4 is connected to the positive output end VCC1 of the first DC / DC auxiliary power supply circuit.
[0063] The second main power circuit includes: a diode D2, a switch tube Q2, a sampling resistor R5, a first voltage-dividing resistor R6, a second voltage-dividing resistor R7, a resistor R8, an ORing controller U2, and a capacitor C2; wherein, the IN end of the ORing controller U2 is connected to one end of the sampling resistor R5 and the cathode of the diode D2 and then connected to the positive input end VIN2+ of the second main power circuit, the other end of the sampling resistor R5 is connected to one end of the first voltage-dividing resistor R6 and then connected to the source of the switch tube Q2, and the other end of the first voltage-dividing resistor R6 is connected to one end of the second voltage-dividing resistor R7 and then connected to the OU of the ORing controller U2 T terminal, the other end of the second voltage-dividing resistor R7 is connected to the drain of the switch tube Q2 and then connected to the positive output terminal VOUT+ of the second main power circuit, the gate of the switch tube 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 and then 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, and 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, the positive output terminals are connected, and the negative output terminals are connected; the positive input terminals of the two DC / DC auxiliary power supply circuits are connected and then connected to the positive output terminal of the main power circuit, and the negative input terminals are connected and then connected to the negative output terminal of the main power circuit, and the output terminals are isolated from each other.
[0065] For the above-mentioned high-voltage ORing circuit, its specific working process is as follows:
[0066] In the case of failure of a main power circuit, such as the input of the first main power circuit is suddenly short-circuited to the ground, the GND terminal voltage of the ORing controller U1 in the first main power circuit is clamped to 1.3V through the diode D1, and the VDD terminal voltage of the ORing controller U1 in the first main power circuit is still 27V relative to the GND terminal voltage, and the ORing controller U1 in the first main power circuit can still work normally; the GATE terminal voltage of the ORing controller U1 in the first main power circuit is still 12V relative to the IN terminal voltage, the switch tube Q1 in the first main power circuit is fully turned on, and the current will temporarily pass through the body of the switch tube Q2 in the second main power circuit. The diode is fed back into the positive input terminal VIN+ of the first main power circuit through the turned-on switch tube Q1 in the first main power circuit. After the reverse current flows through the sampling resistor R1, a voltage drop will be generated. As the reverse current increases, the voltage drop also increases. When the ORing controller U1 detects that the voltage difference between the IN terminal and the OUT terminal exceeds -25mV, it will react quickly and turn off the switch tube 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 terminal and the OUT terminal exceeds 25mV, and the switch tube Q2 in the second main power circuit is turned on to achieve uninterrupted current switching.
[0067] Combining the above, Figure 5 , also taking two main power circuits (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 working conditions are as follows:
[0068] Figure 6The waveform diagram of the input current and voltage of the main power circuit during normal operation is 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 the input voltage of the second main power circuit, the switch tube Q1 in the first main power circuit is in the on state, the switch tube Q2 in the second main power circuit is in the off state, and the main power current is entirely provided by the first main power circuit; when the input voltage of the first main power circuit drops below the input voltage of the second main power circuit, the current is reversed from the body diode of the switch tube Q2 in the second main power circuit into the first main power circuit, the ORing controller U1 in the first main power circuit detects a negative pressure difference, the switch tube Q1 in the first main power circuit is turned off, the ORing controller U2 in the second main power circuit detects the pressure difference, the switch tube Q2 in the second main power circuit is turned on, and the main power current is entirely provided by the second main power circuit.
[0069] Figure 7 The waveform diagram of the input voltage, output voltage and current of the main power circuit during normal operation is shown. 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 the input voltage 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 voltage of the first main power circuit drops below the input voltage of the second main power circuit, the output of the main power circuit is not interrupted, the voltage follows the input voltage of the second main power circuit, the load is a pure resistance load, and the output current of the main power circuit follows the output voltage of the main power circuit.
[0070] Figure 8The waveform diagram of the input voltage and current of the first main power circuit when the input of the main power circuit is short-circuited is 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 the input voltage of the second main power circuit, the switch tube in the first main power circuit is in the on state, the switch tube in the second main power circuit is in the off state, and the main power current is entirely provided by the first main power circuit; when the input of the first main power circuit is short-circuited, the current is fed back from the body diode of the switch tube Q2 in the second main power circuit to the first main power circuit, the ORing controller U1 in the first main power circuit detects a negative pressure difference, the switch tube Q1 in the first main power circuit is turned off, the ORing controller U2 in the second main power circuit detects the pressure difference, the switch tube Q2 in the second main power circuit is turned on, the main power current is entirely provided by the second main power circuit, and the input voltage change 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] Fig. 9 The waveform diagram 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 is shown. 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 the input voltage 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 not interrupted, and the voltage changes with the output voltage of the second main power circuit.
[0072] On the basis of the high-voltage ORing circuit provided in the above embodiments, optionally, another embodiment of the present application further provides a power supply system, which includes: a high-voltage ORing circuit provided in any of the above embodiments.
[0073] In practical applications, the relevant description of the high-voltage ORing circuit can be found in the above embodiments, which will not be repeated here; the relevant description of the power supply system can be found in the prior art, which will not be repeated in this application.
[0074] The power supply system provided in this embodiment includes a high-voltage ORing circuit. Since the corresponding main power circuit in the high-voltage ORing circuit is provided with a DC / DC auxiliary power supply circuit, a sampling circuit and a voltage divider circuit, the output ends of the DC / DC auxiliary power supply circuits 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, and also making the power supply system suitable for high-voltage scenarios.
[0075] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be 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 the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
[0076] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
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 provided with a DC / DC auxiliary power supply circuit, a sampling circuit and a voltage divider circuit, and the output ends of the DC / DC auxiliary power supply circuits are isolated from each other.
2. The high voltage ORing circuit according to claim 1, characterized in that: The negative input terminal and the negative output terminal of each main power circuit and the positive output terminal are connected correspondingly, and the positive input terminal of each main power circuit is independently set.
3. The high voltage ORing circuit according to claim 1, characterized in that: The ORing controller in the main power circuit adopts a floating ground setting.
4. The high voltage ORing circuit according to claim 2, characterized in that: The main power circuit includes: an ORing controller, a switch tube, 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 respectively connected to the first terminal of the sampling circuit, the GND terminal of the ORing controller, one terminal of the capacitor and the negative output terminal of the DC / DC auxiliary power supply circuit, 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 switch tube, the drain of the switch tube 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 switch tube; the VDD terminal of the ORing controller is respectively connected to the other terminal of the capacitor and one terminal of the resistor, and the other terminal 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 respectively 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 comprises: a sampling resistor, one end of the sampling resistor serves as a first end of the sampling circuit, and the other end of the sampling resistor serves as a second end of the sampling circuit; The voltage-dividing circuit includes: a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor serves as the first end of the voltage-dividing circuit; the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor, and the connection point serves as the third end of the voltage-dividing circuit; the other end of the second voltage-dividing resistor serves as the second end of the voltage-dividing circuit.
6. The high voltage ORing circuit according to claim 4, characterized in that: The main power circuit also includes: an input short-circuit clamp circuit, a first end of the input short-circuit clamp circuit is connected to a connection point between the GND end of the ORing controller, the capacitor and the negative output end of the DC / DC auxiliary power supply circuit, and a second end of the input short-circuit clamp circuit is connected to a connection point between the IN end of the ORing controller and the positive input end of the main power circuit.
7. The high voltage ORing circuit according to claim 6, characterized in that: The input short-circuit clamp circuit comprises: a diode, an anode of the diode serving as a first end of the input short-circuit clamp circuit, and a cathode of the diode serving as a second end of the input short-circuit clamp circuit.
8. The high voltage ORing circuit according to any one of claims 1 to 7, characterized in that: The number of the DC / DC auxiliary power supply circuits is consistent with the number of ORing controllers in the high-voltage ORing circuit and the number of the main power circuits.
9. The high voltage ORing circuit according to claim 8, characterized in that: The number of the DC / DC auxiliary power supply circuits, the number of the 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: A high voltage ORing circuit as claimed in any one of claims 1 to 9.