A power supply redundancy circuit based on P-channel MOS tube

Abstract

The present application provides a power supply redundancy circuit based on a P-channel MOS tube, belonging to the field of direct current power supply technology, including input, output, a P-channel MOS tube, a transistor, a comparator and a resistor, the input positive electrode is connected to one end of the sixth resistor and the drain of the MOS tube, the input negative electrode is connected to the emitter of the transistor, the GND end of the comparator and the negative electrode of the output, the source of the MOS tube is connected to the first resistor, the fourth resistor, the fifth resistor, the VCC end of the comparator and the positive output electrode, the other end of the fifth resistor is connected to the 1IN-end of the comparator, the other end of the sixth resistor is connected to the 1IN+ end of the comparator, the gate of the MOS tube is connected to the first resistor and the second resistor, the other end of the second resistor is connected to the collector of the transistor, the base of the transistor is connected to the third resistor, and the third resistor is also connected to the 1OUT end of the comparator and the fourth resistor. The present application scheme has low cost, high reliability, a wider range of applicable input voltages, and is compatible with various types of output voltages in redundant power supplies.

Description

Technical Field

[0001] The present application relates to the technical field of direct current power supply, and in particular to a power supply redundancy circuit based on a P-channel MOS tube. Background Art

[0002] High-availability systems such as servers, network switches, redundant storage disk arrays (RAID), and other forms of communication infrastructure need to have a near-zero downtime rate throughout their entire life cycle. To achieve high reliability, the system power supply generally uses a redundant power supply, which is composed of two identical power supplies. The redundant circuit controls the power supply for load balancing. When one power supply fails, the other power supply can immediately take over its work. After the power supply is replaced, the two power supplies work together again. To meet the above redundancy requirements, the commonly used redundant circuit solution on the market is to use N-channel MOS tubes placed at the positive output of the redundant power supply, and configure a redundant control circuit to control the MOS tube to turn on and off. However, since the N-channel MOS tube requires a forward voltage to drive, this means that the redundant control circuit needs to be additionally configured with an isolated auxiliary source, which increases the number of device types, reduces the reliability of the power supply, and greatly increases the cost of the redundant circuit. At the same time, because the input range of the isolated auxiliary source is limited, the applicable input range of the redundant circuit is narrow. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a power supply redundancy circuit based on a P-channel MOS tube, which at least partially solves the problems in the prior art that the redundant circuit needs to be configured with an isolated auxiliary source, has high cost and a narrow applicable input range.

[0004] The embodiment of the present application provides a power supply redundancy circuit based on a P-channel MOS tube, the circuit includes an input Ui, an output Uo, a MOS tube V1, a transistor V2, a comparator N1 and a resistor, the MOS tube V1 is set as a P-channel MOS tube, the resistors include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, the comparator N1 includes a VCC terminal, a GND terminal, a 1IN- terminal, a 1IN+ terminal and a 1OUT terminal; the positive electrode of the input Ui is respectively connected to one end of the sixth resistor R6 and the drain of the MOS tube V1, and the negative electrode of the input Ui is respectively connected to the emitter of the transistor V2, the GND terminal of the comparator N1 and the output Uo. The negative electrode, the source of the MOS tube V1 is respectively connected to one end of the first resistor R1, one end of the fourth resistor R4, one end of the fifth resistor R5, the VCC end of the comparator N1 and the positive electrode of the output Uo, the other end of the fifth resistor R5 is connected to the 1IN- end of the comparator N1, the other end of the sixth resistor R6 is connected to the 1IN+ end of the comparator N1, the gate of the MOS tube V1 is respectively connected to the other end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the collector of the triode V2, the base of the triode V2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is respectively connected to the 1OUT end of the comparator N1 and the other end of the fourth resistor R4.

[0005] According to a specific implementation of the embodiment of the present application, the model of the comparator N1 is LM193DR.

[0006] According to a specific implementation of the embodiment of the present application, the model of the transistor V2 is BCX41.

[0007] According to a specific implementation of the embodiment of the present application, the input voltage range is set to DC3.3V~DC36V.

[0008] According to a specific implementation method of the embodiment of the present application, the parameters of the first resistor R1, the fifth resistor R5 and the sixth resistor R6 are all set to 0.25W-10KΩ, the parameter of the third resistor R3 is set to 0.25W-1KΩ, and the parameter of the fourth resistor R4 is set to 0.25W-4.99KΩ.

[0009] According to a specific implementation of the embodiment of the present application, the resistance calculation formula of the second resistor R2 is:

[0010] ,

[0011] Among them, V GS is the voltage between the gate and source of the MOS tube V1, R1 is the resistance of the first resistor R1, R2 is the resistance of the second resistor R2, U0=U i, U0 is the output voltage, U i is the input voltage.

[0012] According to a specific implementation method of the embodiment of the present application, the V GS The value range is 3V~10V.

[0013] Beneficial effects:

[0014] In the power redundancy circuit based on P-channel MOS tube in the embodiment of the present application, during the power redundancy process, the input voltage and output voltage are collected by comparator N1. When the input voltage is greater than the output voltage, comparator N1 will send a signal to turn on the power tube of the loop; when the input voltage is less than the output voltage, comparator N1 will send a signal to turn off the power tube of the loop. Thus, when one power supply fails, another redundant backup power supply can immediately take over its work; because P-channel MOS tube is used, the driving signal is a negative voltage, so there is no need for an isolated auxiliary source to provide a driving signal, and the driving signal can be directly provided by the input voltage, thereby saving the isolated auxiliary source circuit and solving the problem that the input range of the isolated auxiliary source is limited, resulting in a narrow applicable input range of the redundant circuit.

[0015] The present application adds a redundant circuit based on P-channel MOS to the power supply output, which has a simple circuit structure, a small number of device types, low cost and high reliability. Secondly, compared with conventional redundant circuits on the market, the present invention is applicable to a wider input voltage range. Since the driving signal is directly powered by the input, it can adapt to DC3.3V-DC36V and is compatible with various types of output voltages in redundant power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a power redundancy circuit based on a P-channel MOS tube according to an embodiment of the present invention;

[0018] Figure 2 FIG. 4 is a schematic diagram of the structure of a comparator N1 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0021] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0022] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0023] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0024] The present application embodiment provides a power supply redundancy circuit based on a P-channel MOS tube. Figure 1 and Figure 2 Describe in detail.

[0025] Specifically, refer to Figure 1The power supply redundancy circuit based on the P-channel MOS tube in this embodiment includes an input Ui, an output Uo, a MOS tube V1, a transistor V2, a comparator N1 and a resistor. The MOS tube V1 is set as a P-channel MOS tube. The resistors include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The comparator N1 includes a VCC terminal, a GND terminal, a 1IN- terminal, a 1IN+ terminal and a 1OUT terminal. The positive electrode of the input Ui is respectively connected to one end of the sixth resistor R6 and the drain of the MOS tube V1, and the negative electrode of the input Ui is respectively connected to the emitter of the transistor V2, the GND terminal of the comparator N1 and the negative electrode of the output Uo. The source of the MOS tube V1 is respectively connected to one end of the first resistor R1, one end of the fourth resistor R4, one end of the fifth resistor R5, the VCC end of the comparator N1 and the positive electrode of the output Uo, the other end of the fifth resistor R5 is connected to the 1IN-end of the comparator N1, the other end of the sixth resistor R6 is connected to the 1IN+end of the comparator N1, the gate of the MOS tube V1 is respectively connected to the other end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the collector of the transistor V2, the base of the transistor V2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is respectively connected to the 1OUT end of the comparator N1 and the other end of the fourth resistor R4.

[0026] In this embodiment, during the power redundancy process, the input voltage and output voltage are collected by the comparator N1. When the input voltage is greater than the output voltage, the comparator N1 will send a signal to turn on the power tube of the loop; when the input voltage is less than the output voltage, the comparator N1 will send a signal to turn off the power tube of the loop. Thus, when one power supply fails, another redundant backup power supply can immediately take over its work; since a P-channel MOS tube is used, the driving signal is a negative voltage, so there is no need for an isolated auxiliary source to provide a driving signal, and the driving signal can be directly provided by the input voltage, thereby saving the isolated auxiliary source circuit and solving the problem that the input range of the isolated auxiliary source is limited, resulting in a narrow applicable input range of the redundant circuit.

[0027] Furthermore, the model of the comparator N1 is LM193DR.

[0028] For details, please refer to the pin definition of comparator N1. Figure 2 The comparator N1 has 8 pins, pin 1 corresponds to 1OUT, pin 2 corresponds to 1IN-, pin 3 corresponds to 1IN+, pin 4 corresponds to GND, pin 5 corresponds to 2IN+, pin 6 corresponds to 2IN-, pin 7 corresponds to 2OUT, and pin 8 corresponds to VCC.

[0029] Furthermore, the model of the transistor V2 is BCX41.

[0030] In one embodiment, the input voltage range is set to DC3.3V to DC36V. This circuit is applicable to a wider input voltage range. Since the driving signal is directly powered by the input, it can adapt to DC3.3V to DC36V and is compatible with various types of output voltages in redundant power supplies, and has a very broad application prospect.

[0031] Further, the parameters of the first resistor R1, the fifth resistor R5 and the sixth resistor R6 are all set to 0.25W-10KΩ, the parameter of the third resistor R3 is set to 0.25W-1KΩ, and the parameter of the fourth resistor R4 is set to 0.25W-4.99KΩ.

[0032] Furthermore, the resistance of the second resistor R2 can be calculated by the following formula:

[0033] ,

[0034] Among them, V GS is the voltage between the gate and source of the MOS tube V1, R1 is the resistance of the first resistor R1, R1=10K, R2 is the resistance of the second resistor R2, U0=U i , U0 is the output voltage, U i is the input voltage, the V GS The value range is 3V~10V. In practical applications, V GS Take as high a value as possible, voltage V GS The higher the conduction, the better the effect.

[0035] The working principle of the power supply redundancy circuit based on the P-channel MOS tube of the present application is as follows: the input voltage Ui is connected, and the input voltage and the output voltage are respectively collected through the 3rd pin (INA+) and the 2nd pin (INA-) of the comparator N1. When the input voltage is greater than the output voltage, the 1st pin (1OUT) of the comparator N1 will send a high-level signal through the third resistor R3 to the base "B pin" of the transistor V2, driving the transistor V2 to turn on, and the second resistor R2 will be connected to the input -IN through the transistor V2. At this time, the input is divided by the first resistor R1 and the second resistor R2 to form a negative voltage signal of the first resistor R1 to drive the gate "G pin" and the source "S pin" of the MOS tube V1, so that the MOS tube is turned on. On the contrary, when the input voltage is less than the output voltage, the 1st pin (1OUT) of the comparator N1 will send a low-level signal through the third resistor R3 to the base "B pin" of the transistor V2, so that the transistor V2 is not turned on, the second resistor R2 and the input-IN are disconnected, and the current flowing through the first resistor R1 is 0A. Therefore, the voltage of the first resistor R1 is 0V, which causes the gate "G pin" and the source "S pin" voltage of the MOS tube V1 to be 0V, so that the MOS tube V1 is turned off to achieve the redundancy function. The present application adds a redundant circuit based on a P-channel MOS tube to the power supply output, so that the power supply can not only achieve the redundant function, but also greatly simplifies the circuit, improves the circuit reliability, and saves the design cost.

[0036] Compared with the commonly used redundant circuit, this application has the following advantages:

[0037] First, the circuit is simple, the number of device types is small, the cost is low, and the reliability is high;

[0038] Second, compared with conventional redundant circuits on the market, the present invention is applicable to a wider input voltage range. Since the driving signal is directly powered by the input, it can adapt to DC3.3V~DC36V and is compatible with various types of output voltages in redundant power supplies.

[0039] The circuit of the present application has the characteristics of small size, low device cost, simple circuit, strong functional compatibility, high reliability, wide application range, suitable for redundancy requirements of various power supplies, and has broad application prospects.

[0040] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power redundancy circuit based on a P-channel MOS tube, characterized in that: The circuit includes an input Ui, an output Uo, a MOS tube V1, a triode V2, a comparator N1 and a resistor. The MOS tube V1 is set as a P-channel MOS tube. The resistors include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The comparator N1 includes a VCC terminal, a GND terminal, a 1IN- terminal, a 1IN+ terminal and a 1OUT terminal. The positive electrode of the input Ui is respectively connected to one end of the sixth resistor R6 and the drain of the MOS tube V1, the negative electrode of the input Ui is respectively connected to the emitter of the triode V2, the VCC terminal of the comparator N1 and the negative electrode of the output Uo, and the source of the MOS tube V1 is respectively connected to the VCC terminal of the comparator N1 and the negative electrode of the output Uo. The MOS tube V1 is connected to one end of the first resistor R1, one end of the fourth resistor R4, one end of the fifth resistor R5, the GND end of the comparator N1 and the positive electrode of the output Uo, respectively. The other end of the fifth resistor R5 is connected to the 1IN- end of the comparator N1, and the other end of the sixth resistor R6 is connected to the 1IN+ end of the comparator N1. The gate of the MOS tube V1 is connected to the other end of the first resistor R1 and one end of the second resistor R2, respectively. The other end of the second resistor R2 is connected to the collector of the transistor V2, and the base of the transistor V2 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the 1OUT end of the comparator N1 and the other end of the fourth resistor R4, respectively.

2. The power redundancy circuit based on P-channel MOS tube according to claim 1, characterized in that: The model of the comparator N1 is LM193DR.

3. The power redundancy circuit based on P-channel MOS tube according to claim 1, characterized in that: The model of the transistor V2 is BCX41.

4. The power redundancy circuit based on P-channel MOS tube according to claim 1, characterized in that: The input voltage range is set to DC3.3V~DC36V.

5. The power redundancy circuit based on P-channel MOS tube according to claim 4, characterized in that: The parameters of the first resistor R1, the fifth resistor R5 and the sixth resistor R6 are all set to 0.25W-10KΩ, the parameter of the third resistor R3 is set to 0.25W-1KΩ, and the parameter of the fourth resistor R4 is set to 0.25W-4.99KΩ.

6. The power redundancy circuit based on P-channel MOS tube according to claim 5, characterized in that: The resistance calculation formula of the second resistor R2 is: ， Among them, V GS is the voltage between the gate and source of the MOS tube V1, R1 is the resistance of the first resistor R1, R2 is the resistance of the second resistor R2, U0=U i , U0 is the output voltage, U i is the input voltage.

7. The power redundancy circuit based on P-channel MOS tube according to claim 6, characterized in that: The V GS The value range is 3V~10V.

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