CN218549571U - Power supply redundancy protection circuit - Google Patents
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- CN218549571U CN218549571U CN202222672616.6U CN202222672616U CN218549571U CN 218549571 U CN218549571 U CN 218549571U CN 202222672616 U CN202222672616 U CN 202222672616U CN 218549571 U CN218549571 U CN 218549571U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model provides a power supply redundancy protection circuit, which comprises a power supply state detection unit, a power supply switch control unit, a power supply redundancy protection unit, a first power supply unit and a second power supply unit; the input end of the power state detection unit is connected with a first power signal and a second power signal and used for outputting a power state detection signal based on the first power signal and the second power signal; the power switch control unit is connected with the power state detection unit and used for outputting a power switch control signal; and the power supply redundancy protection unit is connected with the power switch control unit and used for selecting the first power supply unit or the second power supply unit to supply power. The utility model realizes the power supply redundancy protection function by using fewer components; the hot plug of the power supply is supported, and the high availability and the continuity of the power supply system are realized; the power supply overvoltage protection and undervoltage protection are supported, and the stability and the reliability of the system operation are ensured; the implementation scheme is simple and the cost is low.
Description
Technical Field
The utility model relates to a power supply design technical field especially relates to a redundant protection circuit of power.
Background
In the redundant hot standby control system, the whole PLC control system comprises 2 sets of PLC host computers, power supplies and redundant processing modules which are completely configured identically, and 2 controller subunits work in parallel by using the same user program, wherein one controller is a main controller, and the other controller is a standby controller. When the main controller fails, the system can be automatically switched to the standby controller so as to realize the stable, reliable and continuous operation of the PLC control system. The PLC host needs redundant double-machine function, the power supply also needs redundant protection, and the redundant protection of the power supply can provide guarantee for realizing long-time stable work of the power supply in the PLC control system and high-reliability automatic control. The existing power redundancy protection scheme utilizes a detection module to detect state information of a voltage input end and outputs the state information to a monitoring module; the monitoring module controls the on-off of a switch in the switch module according to the input state information; the switch module controls the power supply voltage distributed by the power supply distribution module and the connection or disconnection of the power supply module through the connection or disconnection of the switch, so that the power supply redundancy function is realized. The existing power supply redundancy protection scheme has the disadvantages of complex implementation process, high implementation difficulty and high cost.
Hot plugging, namely hot plugging, means that a module and a board card are inserted into or pulled out of a system without influencing the normal work of the system under the condition of not shutting down a system power supply, so that the reliability, the quick maintainability, the redundancy, the timely recovery capability to disasters and the like of the system are improved. For a high-power modularized power supply system, the hot plug technology can replace a power supply module with a fault under the condition of maintaining the voltage of the whole power supply system, and ensure the normal operation of other power supply modules in the modularized power supply system. At present, the hot-plug technology is not perfect enough, and the traditional hot-plug operation still causes adverse effects on other components in the power supply system in the system, thereby reducing the working effect of the whole power supply system.
Disclosure of Invention
In view of the above shortcoming of the prior art, the utility model aims to provide a power supply redundancy protection circuit for solve the technical problem that current power supply redundancy protection scheme implementation process is complicated, the implementation degree of difficulty is big and with high costs. Compare in current power redundancy protection method, the utility model discloses utilize less components and parts to realize the power redundancy protect function that needs to rely on ADC voltage detection, CPU operation judgement and CPU output just can realize, and the implementation scheme is simple, and is with low costs.
In order to achieve the above and other related objects, the present invention provides a power supply redundancy protection circuit, which includes a power state detection unit, a power switch control unit, a power supply redundancy protection unit, a first power supply unit and a second power supply unit; the input end of the power state detection unit is connected with a first power signal and a second power signal and used for outputting a power state detection signal based on the first power signal and the second power signal; the power switch control unit is connected with the power state detection unit and used for outputting a power switch control signal based on the power state detection signal; the power supply redundancy protection unit is connected with the power switch control unit and used for selecting the first power supply unit or the second power supply unit to supply power based on the power switch control signal so as to realize power supply redundancy protection. The utility model discloses utilize less components and parts to have realized the power redundancy protect function that needs rely on ADC voltage detection, CPU operation judgement and CPU output just can realize.
In an embodiment of the present invention, the power state detection unit includes a voltage detection unit, a reference circuit unit and a window comparator;
the input end of the voltage detection unit is connected with the first power supply signal and used for determining the voltage threshold of power supply overvoltage protection and undervoltage protection based on the first power supply signal;
the input end of the reference circuit unit is connected with the second power supply signal and is used for generating a power supply overvoltage protection reference voltage and an undervoltage protection reference voltage based on the second power supply signal;
the window comparator is connected with the voltage detection unit and the reference circuit unit, and outputs a power state detection signal by comparing the magnitude relation between the overvoltage protection reference voltage and the voltage threshold value and the magnitude relation between the undervoltage protection reference voltage and the voltage threshold value; the power state detection signal includes a high level signal and a low level signal.
In an embodiment of the present invention, the overvoltage protection reference voltage is greater than the undervoltage protection reference voltage.
In an embodiment of the present invention, the window comparator includes an overvoltage protection unit and an undervoltage protection unit;
the forward end of the overvoltage protection unit is connected with the voltage threshold, and the reverse end of the overvoltage protection unit is connected with the overvoltage protection reference voltage and used for outputting the high-level signal when the voltage threshold is larger than the overvoltage protection reference voltage;
and the forward end of the undervoltage protection unit is connected with the undervoltage protection reference voltage, and the reverse end of the undervoltage protection unit is connected with the voltage threshold and is used for outputting the high-level signal when the voltage threshold is smaller than the undervoltage protection reference voltage.
In an embodiment of the present invention, the window comparator is used for the voltage threshold value is greater than the under-voltage protection reference voltage and less than the output during the over-voltage protection reference voltage the low level signal guarantees the stability and reliability of the system operation.
In an embodiment of the present invention, the power switch control unit includes a triode and a first PMOS transistor; the triode and the first PMOS tube are used for switching on or off states based on the power state detection signal so as to output the power switch control signal.
In an embodiment of the present invention, the power redundancy protection unit includes a filtering unit and a power redundancy hot standby unit;
the filtering unit comprises a filtering capacitor and a bit surge protector and is used for filtering the power switch control signal to generate a power switch filtering signal;
the power supply redundancy hot standby unit is connected with the filtering unit and used for selecting the first power supply unit or the second power supply unit to supply power based on the power switch filtering signal.
In an embodiment of the present invention, the first power supply unit includes a second PMOS transistor and a resistor, a drain of the second PMOS transistor is connected to the power switch filtering signal, a gate is connected in series with the resistor and then grounded, and a source is connected to a load; the second power supply unit comprises a composite triode and the resistor; and the first input end of the composite triode is connected with the drain electrode of the second PMOS tube, the second input end of the composite triode is connected with the source electrode of the second PMOS tube, and the output end of the composite triode is grounded after being connected with the resistor in series.
In an embodiment of the present invention, the second power supply unit is a mirror current source of the first power supply unit, and is used for taking over the operation of the first power supply unit when the first power supply unit fails, so as to realize high availability and continuity of the power supply system.
In an embodiment of the present invention, the first power supply unit supports a hot plug function.
As described above, the utility model discloses a redundant protection circuit of power has following beneficial effect:
(1) The power supply redundancy protection function which can be realized only by ADC voltage detection, CPU operation judgment and CPU output is realized by using fewer components;
(2) The hot plug of a power supply is supported, and the high availability and the continuity of a power supply system are realized;
(3) The power supply overvoltage protection and undervoltage protection are supported, and the stability and the reliability of the system operation are ensured;
(4) The implementation scheme is simple and the cost is low.
Drawings
Fig. 1 is a schematic block diagram of a power redundancy protection circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a window comparator in an embodiment of the power redundancy protection circuit of the present invention.
Fig. 3 is a schematic diagram of a power redundancy protection circuit according to an embodiment of the present invention.
Description of the element reference
1. Power state detection unit
11. Voltage detection unit
12. Reference circuit unit
13. Window comparator
131. Overvoltage protection unit
132. Undervoltage protection unit
2. Power switch control unit
3. Power supply redundancy protection unit
31. Filter unit
32. Power supply redundancy hot standby unit
4. First power supply unit
5. Second power supply unit
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.
Furthermore, descriptions in the present application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example 1
As shown in fig. 1, in the present embodiment, the power redundancy protection circuit of the present invention includes a power state detection unit 1, a power switch control unit 2, a power redundancy protection unit 3, a first power supply unit 4 and a second power supply unit 5.
The input end of the power state detection unit 1 is connected to a first power signal and a second power signal and is used for outputting a power state detection signal based on the first power signal and the second power signal.
Specifically, the power state detection unit 1 includes a voltage detection unit 11, a reference circuit unit 12, and a window comparator 13. The input end of the voltage detection unit 11 is connected to the first power signal, and is configured to determine a voltage threshold of power overvoltage protection and voltage undervoltage protection based on the first power signal. The input end of the reference circuit unit 12 is connected to the second power signal, and is configured to generate a power supply overvoltage protection reference voltage and an undervoltage protection reference voltage based on the second power signal. The window comparator 13 is connected to the voltage detection unit 11 and the reference circuit unit 12, and outputs a power state detection signal by comparing the magnitude relationship between the overvoltage protection reference voltage and the voltage threshold and the magnitude relationship between the undervoltage protection reference voltage and the voltage threshold. The power state detection signal includes a high level signal and a low level signal. The overvoltage protection reference voltage is greater than the undervoltage protection reference voltage.
As shown in fig. 2, the window comparator 13 includes an overvoltage protection unit 131 and an undervoltage protection unit 132. The forward end of the overvoltage protection unit 131 is connected to the voltage threshold, and the reverse end is connected to the overvoltage protection reference voltage, and is configured to output the high level signal when the voltage threshold is greater than the overvoltage protection reference voltage. The forward end of the under-voltage protection unit 132 is connected to the under-voltage protection reference voltage, and the reverse end is connected to the voltage threshold, and is configured to output the high level signal when the voltage threshold is smaller than the under-voltage protection reference voltage. The window comparator 13 is configured to output the low level signal when the voltage threshold is greater than the under-voltage protection reference voltage and less than the over-voltage protection reference voltage. The window comparator 13 ensures the stability and reliability of the system operation.
The power switch control unit 2 is connected with the power state detection unit 1 and is used for outputting a power switch control signal based on the power state detection signal.
Specifically, the power switch control unit 2 includes a triode and a first PMOS transistor; the triode and the first PMOS tube are used for switching on or off states based on the power state detection signal so as to output the power switch control signal.
The power supply redundancy protection unit 3 is connected with the power switch control unit 2 and used for selecting the first power supply unit 4 or the second power supply unit 5 to supply power based on the power switch control signal so as to realize power supply redundancy protection.
Specifically, the power supply redundancy protection unit includes a filtering unit 31 and a power supply redundancy hot standby unit 32. The filtering unit 31 includes a filter capacitor and a bit surge protector, and is configured to filter the power switch control signal to generate a power switch filtering signal. The power redundancy hot standby unit 32 is connected to the filtering unit 31, and is configured to select the first power supply unit 4 or the second power supply unit 5 to supply power based on the power switch filtering signal. Wherein the first power supply unit 4 supports a hot plug function.
The first power supply unit 4 comprises a second PMOS tube and a resistor, the drain electrode of the second PMOS tube is connected to the filtering signal of the power switch, the grid electrode of the second PMOS tube is connected with the resistor in series and then is grounded, and the source electrode of the second PMOS tube is connected with a load; the second power supply unit 5 comprises a composite triode and the resistor; and a first input end of the composite triode is connected with a drain electrode of the second PMOS tube, a second input end of the composite triode is connected with a source electrode of the second PMOS tube, and an output end of the composite triode is connected with the resistor in series and then is grounded.
The second power supply unit 5 is a mirror current source of the first power supply unit 4, and is configured to take over the operation of the first power supply unit 4 when the first power supply unit 4 fails, so as to achieve high availability and continuity of the power supply system.
Example 2
As shown in fig. 3, the power supply redundancy protection circuit of the present invention includes a power state detection unit, a power switch control unit, a power supply redundancy protection unit, a first power supply unit and a second power supply unit.
The power state detection unit comprises a voltage detection unit, a reference circuit unit and a window comparator. The voltage detection unit comprises R9, R14 and C9, wherein one end of the R9 is an input end of the voltage detection unit and is used for accessing a first power supply signal of +5V, and the other end of the R9 is connected with the R14 in series and then is grounded; and C9 is a filter capacitor and is connected in parallel with two ends of R14. The voltage thresholds for power supply over-voltage protection and under-voltage protection can be determined by setting appropriate resistance values for R9 and R14. The power supply overvoltage protection voltage threshold in this embodiment is equal to the undervoltage protection voltage threshold.
The reference circuit unit comprises series-connected divider resistors R5, R8 and R15, wherein a first end of the R5 is the other input end of the voltage detection unit and is used for accessing a +3V second power supply signal, and a second end of the R5 is connected with a first end of the R8; the first end of R15 is connected with the second end of R8, and the second end of R15 is grounded. The power supply overvoltage protection reference voltage and the undervoltage protection reference voltage can be simultaneously output by setting appropriate resistance values for R5, R8 and R15. The overvoltage protection reference voltage in this embodiment is greater than the undervoltage protection reference voltage.
The window comparator comprises an overvoltage protection unit and an undervoltage protection unit, and outputs a power state detection signal by comparing the magnitude relation between the overvoltage protection reference voltage and the voltage threshold value and the magnitude relation between the undervoltage protection reference voltage and the voltage threshold value; the power state detection signal includes a high level signal and a low level signal. The window comparator ensures the stability and reliability of the system operation.
The overvoltage protection unit comprises U1A, R1, R13, R14 and D2, has the function of a hysteresis (Schmidt) comparator and is used for preventing the overvoltage protection unit from misoperation caused by voltage jitter, and the hysteresis voltage delta V = Vcc (R13 + R14)/R1, wherein Vcc is a +3V voltage signal input by a positive power supply end of U1A. And a first end of the R13 is connected with the output end of the power supply detection unit, and a second end of the R13 is connected with the input end of the window comparator. Specifically, a forward end of the overvoltage protection unit is connected to a second end of the R13 for connecting to the voltage threshold, and a reverse end of the overvoltage protection unit is connected to a second end of the R5 for connecting to the overvoltage protection reference voltage. And D2 is connected with the output end of the overvoltage protection unit and used for carrying out reverse protection on the overvoltage protection unit and preventing the overvoltage protection unit from being damaged.
The undervoltage protection unit comprises U1B, R10, R15 and D3, has the function of a hysteresis (Schmitt) comparator and is used for preventing the undervoltage protection unit from misoperation caused by voltage jitter, and the hysteresis voltage delta V = Vcc R15/R10, wherein Vcc is a +3V voltage signal input by a positive power supply end of U1B. The forward end of the undervoltage protection unit is connected to the first end of the R15 and used for being connected to the undervoltage protection reference voltage, and the reverse end of the undervoltage protection unit is connected to the second end of the R13 and used for being connected to the voltage threshold. And D3 is connected with the output end of the undervoltage protection unit and used for carrying out reverse protection on the undervoltage protection unit and preventing the undervoltage protection unit from being damaged.
When the voltage threshold is larger than the overvoltage protection reference voltage, namely the forward end voltage of the overvoltage protection unit U1A is larger than the voltage of the reverse end, the overvoltage protection unit U1A is conducted, the undervoltage protection unit U1B is cut off, the window comparator outputs a high level signal, and the high level signal represents that the input power supply voltage is not in a normal working range; when the voltage threshold is smaller than the undervoltage protection reference voltage, namely the forward terminal voltage of the undervoltage protection unit U1B is larger than the voltage of the reverse terminal, the undervoltage protection unit U1B is switched on, the overvoltage protection unit U1A is switched off, the window comparator outputs a high level signal, and the high level signal also represents that the input power supply voltage is not in a normal working range; when the voltage threshold is greater than the undervoltage protection reference voltage and less than the overvoltage protection reference voltage, that is, the forward terminal voltage of the overvoltage protection unit U1A is less than the voltage of the reverse terminal, and the forward terminal voltage of the undervoltage protection unit U1B is less than the voltage of the reverse terminal, at this time, both the overvoltage protection unit U1A and the undervoltage protection unit U1B are turned off, the window comparator outputs a low level signal, and the low level signal represents that the input power voltage is in a normal working range.
The power switch control unit comprises a first PMOS (P-channel metal oxide semiconductor) tube Q1, triodes Q4 and Q5, resistors R2, R3, R4, R11, R12 and R16, capacitors C1, C8 and C4 and a diode D1, wherein the R2 and the D1 form a voltage stabilizing circuit which is used for providing a stable second power supply signal for the reference circuit unit and the window comparator; c4 is a filter capacitor; r4 is a dummy load for preventing the generation of a dummy voltage; the triodes Q4 and Q5 and the first PMOS transistor Q1 are configured to switch an on or off state based on the power state detection signal to output the power switch control signal. For example, when the window comparator outputs a high level signal due to power over-voltage protection or under-voltage protection, Q4 is turned on, Q5 is turned off, and Q1 outputs a power off control signal to turn off the power output and protect the back-end circuit; when the window comparator detects that the power supply voltage is in a normal working range and outputs a low level signal, Q4 is cut off, Q5 is conducted, Q1 is conducted, and meanwhile Q1 outputs a power supply opening control signal to ensure normal power supply output.
The power supply redundancy protection unit is connected with the power switch control unit, comprises a filtering unit and a power supply redundancy hot standby unit, and is used for selecting the first power supply unit or the second power supply unit to supply power based on the power switch control signal so as to realize power supply redundancy protection.
The filtering unit comprises capacitors C2, C5 and C6 and a surge protector TVS1, wherein C6 is an input filtering capacitor and is used for filtering the power switch control signal to generate a power switch filtering signal; and the C2, the C5 and the TVS1 form an output filter circuit which is used for filtering output signals of the first power supply unit and the second power supply unit.
The power supply redundancy hot standby unit is connected with the filtering unit and used for selecting the first power supply unit or the second power supply unit to supply power based on the power switch filtering signal.
The first power supply unit comprises a second PMOS (P-channel metal oxide semiconductor) tube Q2 and a resistor R7, the drain electrode of the second PMOS tube Q2 is connected to the filtering signal of the power switch, the grid electrode of the second PMOS tube Q2 is connected with the resistor R7 in series and then is grounded, and the source electrode of the second PMOS tube Q2 is connected with a load; the second power supply unit comprises a compound triode Q3 and resistors R6 and R7; the composite triode Q3 comprises two PNP type triodes with common base electrodes, emitting electrodes of the PNP type triodes are respectively a first input end and a second input end of the composite triode Q3, the first input end is connected with a drain electrode of the second PMOS pipe Q2, and the second input end is connected with a source electrode of the second PMOS pipe Q2; the collector of one PNP type triode is connected with the base electrode, is connected with the resistor R6 in series and then is grounded; and the grid electrode of the Q2 is controlled by the collector electrode of the other PNP type triode in a feedback mode, and the other PNP type triode is connected with the resistor R7 in series and then grounded.
When the +5V input power supply voltage is larger than the external +5VD load voltage, the first input end of the Q3 is conducted, meanwhile, the current flows into the second input end of the Q3 through the freewheeling diode of the second PMOS pipe Q2, then flows into the resistor R7, and controls the grid electrode of the Q2 in a feedback mode, and the grid electrode and the Q2 form a current source control mode. With the change of the external load, the current on the resistor R7 is adjusted to control the conduction current of the Q2; when the +5V input power supply voltage is smaller than the external +5VD load voltage, Q2 is cut off, external current is prevented from being poured backwards, and the power supply redundancy function is realized.
The first power supply unit supports a hot plug function. The second power supply unit is a mirror current source of the first power supply unit and is used for taking over the work of the first power supply unit when the first power supply unit fails, so that the high availability and the continuity of the power supply system are realized. After the power supply is replaced, the first power supply unit and the second power supply unit work cooperatively.
To sum up, the power supply redundancy protection circuit of the utility model utilizes fewer components to realize the power supply redundancy protection function which can be realized only by ADC voltage detection, CPU operation judgment and CPU output; the hot plug of the power supply is supported, and the high availability and the continuity of the power supply system are realized; the power supply overvoltage protection and undervoltage protection are supported, and the stability and the reliability of the system operation are ensured; the implementation scheme is simple and the cost is low. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A power supply redundancy protection circuit is characterized by comprising a power supply state detection unit, a power supply switch control unit, a power supply redundancy protection unit, a first power supply unit and a second power supply unit;
the input end of the power state detection unit is connected with a first power signal and a second power signal and used for outputting a power state detection signal based on the first power signal and the second power signal;
the power switch control unit is connected with the power state detection unit and used for outputting a power switch control signal based on the power state detection signal;
the power supply redundancy protection unit is connected with the power switch control unit and used for selecting the first power supply unit or the second power supply unit to supply power based on the power switch control signal so as to realize power supply redundancy protection.
2. The power supply redundancy protection circuit of claim 1, wherein the power state detection unit comprises a voltage detection unit, a reference circuit unit and a window comparator;
the input end of the voltage detection unit is connected with the first power supply signal and used for determining the voltage threshold of power supply overvoltage protection and undervoltage protection based on the first power supply signal;
the input end of the reference circuit unit is connected with the second power supply signal and is used for generating a power supply overvoltage protection reference voltage and an undervoltage protection reference voltage based on the second power supply signal;
the window comparator is connected with the voltage detection unit and the reference circuit unit, and outputs a power state detection signal by comparing the magnitude relation between the overvoltage protection reference voltage and the voltage threshold value and the magnitude relation between the undervoltage protection reference voltage and the voltage threshold value; the power state detection signal includes a high level signal and a low level signal.
3. The power supply redundancy protection circuit of claim 2, wherein the over-voltage protection reference voltage is greater than the under-voltage protection reference voltage.
4. The power supply redundancy protection circuit of claim 2, wherein the window comparator comprises an over-voltage protection unit and an under-voltage protection unit;
the forward end of the overvoltage protection unit is connected with the voltage threshold, and the reverse end of the overvoltage protection unit is connected with the overvoltage protection reference voltage and used for outputting the high-level signal when the voltage threshold is larger than the overvoltage protection reference voltage;
and the forward end of the undervoltage protection unit is connected with the undervoltage protection reference voltage, and the reverse end of the undervoltage protection unit is connected with the voltage threshold and is used for outputting the high-level signal when the voltage threshold is smaller than the undervoltage protection reference voltage.
5. The power supply redundancy protection circuit of claim 2, wherein the window comparator is configured to output the low level signal when the voltage threshold is greater than the under-voltage protection reference voltage and less than the over-voltage protection reference voltage.
6. The power supply redundancy protection circuit of claim 1, wherein the power switch control unit comprises a triode and a first PMOS transistor; the triode and the first PMOS tube are used for switching on or off states based on the power state detection signal so as to output the power switch control signal.
7. The power supply redundancy protection circuit according to claim 1, wherein the power supply redundancy protection unit comprises a filtering unit and a power supply redundancy hot standby unit;
the filtering unit comprises a filtering capacitor and a bit surge protector and is used for filtering the power switch control signal to generate a power switch filtering signal;
and the power supply redundancy hot standby unit is connected with the filtering unit and used for selecting the first power supply unit or the second power supply unit to supply power based on the power switch filtering signal.
8. The power supply redundancy protection circuit of claim 7, wherein the first power supply unit comprises a second PMOS transistor and a resistor, a drain of the second PMOS transistor is connected to the filtered signal of the power switch, a gate of the second PMOS transistor is connected in series with the resistor and then grounded, and a source of the second PMOS transistor is connected to a load; the second power supply unit comprises a composite triode and the resistor; and a first input end of the composite triode is connected with a drain electrode of the second PMOS tube, a second input end of the composite triode is connected with a source electrode of the second PMOS tube, and an output end of the composite triode is connected with the resistor in series and then is grounded.
9. The power supply redundancy protection circuit of claim 1, wherein the second power supply unit is a mirror current source of the first power supply unit for taking over the first power supply unit to operate when the first power supply unit fails.
10. The power supply redundancy protection circuit of claim 1, wherein the first power supply unit supports a hot swap function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222672616.6U CN218549571U (en) | 2022-10-11 | 2022-10-11 | Power supply redundancy protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222672616.6U CN218549571U (en) | 2022-10-11 | 2022-10-11 | Power supply redundancy protection circuit |
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| CN218549571U true CN218549571U (en) | 2023-02-28 |
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| CN202222672616.6U Active CN218549571U (en) | 2022-10-11 | 2022-10-11 | Power supply redundancy protection circuit |
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