CN216121903U - Low-loss redundancy operation circuit of switching power supply - Google Patents
Low-loss redundancy operation circuit of switching power supply Download PDFInfo
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- CN216121903U CN216121903U CN202121617593.8U CN202121617593U CN216121903U CN 216121903 U CN216121903 U CN 216121903U CN 202121617593 U CN202121617593 U CN 202121617593U CN 216121903 U CN216121903 U CN 216121903U
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Abstract
The utility model discloses a low-loss redundant operation circuit of a switching power supply, wherein one of two switching power supply modules is used as a main power supply, and the other switching power supply module is used as a redundant power supply; the power supply positive ends of the output ends of the two switching power supply modules are directly connected in parallel; the negative ends of the output ends of the two switching power supply modules are isolated from each other by adopting N-type MOSFETs and then are connected in parallel; the negative end of the power supply input end of the standby redundant switch power supply module is controlled by an N-type MOSFET; the output end and the input end of the standby redundant switch power supply module are isolated through an optical coupler. The method is suitable for the redundant operation design of the switch power supply module with direct current input and direct current output, the internal circuit structure of the switch power supply module does not need to be changed, the fault-free operation time of the switch power supply is doubled, and the reliability of the power supply is greatly improved.
Description
Technical Field
The utility model relates to the field of redundant operation of a switching power supply, in particular to a low-loss redundant operation circuit of the switching power supply, which is applied to power distribution equipment of a certain type system and the redundant design of a direct-current power supply board in a power distribution cabinet, can greatly improve the reliability of the power supply, and greatly improve the working reliability index of the equipment. The reliable and stable operation of distribution equipment is ensured.
Background
The switching power supply is the basis for the work of the electronic equipment, and the electronic equipment cannot work due to the abnormal power supply. In critical areas, power supply anomalies are not allowed. However, the electronic components cannot avoid abnormity, and in order to improve the reliability of the power supply, on the premise that the high-reliability electronic components are adopted in the power supply, the power supply redundancy operation backup is adopted, so that the fault-free operation time of the power supply of the whole power supply can be greatly improved.
Meanwhile, the possibility of reverse connection exists when the input end of the direct current power supply is operated, in order to improve the reliability of the power supply, the input reverse connection prevention design is added, no device is damaged when the reverse connection occurs, and the power supply does not work.
In the existing redundant operation design, the output end is isolated by a diode and then output in parallel, the loss of the diode is large when the current is large, and when the load of a power supply module is increased, the situation that a standby power supply module is triggered by mistake and repeatedly switched easily occurs when the output voltage is reduced.
Therefore, in view of the defects existing in the prior art, research is needed to provide a scheme for effectively and reliably improving the redundancy operation reliability of the power supply, reducing the output loss and simultaneously providing reverse connection prevention protection.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides a low-loss redundant operation circuit of a switching power supply, which is characterized in that two power supply modules are adopted by the power supply, the input ends adopt a non-damage anti-reversion design, the output ends are connected in parallel after controlling low-loss control, and when the output of the main power supply module is normal, the output of the standby power supply module is controlled to be turned off. When the main power supply has no output, the standby power supply module automatically starts and supplies power normally. The method is suitable for the redundant operation design of the switch power supply module with direct current input and direct current output, the internal circuit structure of the switch power supply module does not need to be changed, the fault-free operation time of the switch power supply is doubled, and the reliability of the power supply is greatly improved.
The object of the present invention is achieved by the following technical means. A low-loss redundant operation circuit of a switching power supply comprises two negative logic control switching power supply modules U1 and U2, wherein U1 is used as a main power supply, U2 is used as a redundant standby power supply, an enabling end is connected with a low-level module to work, and a direct-current 4V-direct-current 50V high-level or suspension module is switched off;
the negative ends of the input ends of U1 and U2 are in no damage and reverse connection prevention by adopting a switch tube Q1; the positive ends of the power supplies at the output ends of the U1 and the U2 are directly connected in parallel and are connected with the positive end of the power output, the negative ends of the output ends of the two switching power supply modules are isolated from each other by adopting an N-type MOSFET and then connected in parallel, and the negative end of the power supply input end of the standby redundant switching power supply module is controlled by adopting the N-type MOSFET;
the U1 is used as a main power supply, the power supply output controls the output of the switch tube Q1 after voltage division, and the U1 output controls the output of the switch tube Q2 of the U2 to be turned off; when the U1 outputs normally, the output end and the input end of the standby redundant switch power supply module are isolated by the optical coupler, the output switch tube Q3 at the negative end of the U2 is switched off by the switch tube Q4, and the output of the U2 is switched off by the isolation control of the optical coupler U3;
when the U1 outputs, the ENA is enabled by controlling the U2 power supply; when the U1 has no output, the U2 is automatically switched; when the U1 returns to normal, the U1 continues to be used as a main power supply output, and the power supply module U2 is turned off;
when the power supply is just connected, the U1 and the U2 work at the same time to form a power supply module, and when the U1 works normally, the U2 is switched off;
the switching tube Q2 is in an off state when the power supply module U1 has no output;
the switching tube Q3 is in an off state when the power module U2 has no output.
Furthermore, the power supply modules U1 and U2 are of the same type, the input direct-current voltage is lower than 800V, and the power supply modules output direct-current voltage; the power module is a negative logic N type or a positive logic P type, the negative logic N type power module enables the power module to work when the enabling end is connected with a low level, and the power module is switched off when the enabling end is suspended or connected with a high level; and the P-type power supply module works when the enabling end is suspended or connected with a high level, and the power supply is turned off when the enabling end is grounded.
Furthermore, the switching tube Q1, the switching tube Q2 and the switching tube Q3 are N-channel MOSFETs, and the Q4 is an NPN-type transistor.
Furthermore, the negative end of the input end of the power supply module is connected with an anti-reverse switch tube Q1, and the drain-source voltage withstand voltage Vds, the grid divider resistors R1 and R2 and the voltage stabilizing diode D1 change according to the direct current input voltage.
Furthermore, the negative terminal of the output terminal of the power supply module U1 is connected to the reverse-connection prevention switch Q2, and the drain-source voltage withstand voltage Vds, the gate divider resistors R4 and R5 and the zener diode D3 vary according to the dc output voltage.
Furthermore, the negative terminal of the output terminal of the power supply module U2 is connected to the reverse-connection prevention switch Q3, and the drain-source voltage withstand voltage Vds, the gate divider resistors R10 and R11 and the zener diode D6 vary according to the dc output voltage.
Furthermore, the output end of the power module U1 controls the enabling end of the U2 to turn off the power module through a control optocoupler U3, and the resistance value of the resistor R8 is not fixed according to the control requirement; the current transmission ratio CTR of the isolation-controlled optical coupler is more than 50%.
Compared with the prior art, the beneficial results of the utility model are as follows:
1. the N-channel MOSFET is adopted, so that the conduction loss and the switching loss are low, and the loss is reduced;
2. the control is carried out by adopting the negative end of the power supply, so that the control stability and the cost reduction are improved;
3. the source electrode and the drain electrode of the switching tube are isolated by the diode, so that the effect of isolating the switching tubes Q2 and Q3 is guaranteed;
4. the standby power supply module U2 is turned off, and the switching tube Q4 adopts a common NPN transistor, so that the cost is low and the power consumption is low;
5. the input end of the standby power supply is turned off, and optical coupling isolation is adopted to ensure the isolation of input and output power supply electrical appliances;
6. when the main power supply is abnormal, the standby power supply can automatically switch power supply, and the integral reliability of the power supply is ensured.
Drawings
FIG. 1 is a circuit schematic of the main power, redundant power supply connection of the present invention.
Fig. 2 is a schematic diagram of the redundant power supply being turned off during normal operation of the main power supply. The black thick line is a wiring diagram of the power supply circuit.
Fig. 3 is a schematic diagram of the redundant power supply being activated and outputting when the main power supply has no output. The black thick line is a wiring diagram of the power supply circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Meanwhile, the following examples are further illustrative and supplementary of the present invention, and do not limit the present invention in any way.
The utility model is further illustrated below with reference to the figures and examples.
The utility model adopts the following technical scheme: a low-loss redundant operation circuit of a switching power supply is characterized in that the power supply adopts two power supply modules with the same model, and the negative end of the input end adopts an N-channel MOSFET device which is not damaged and is reverse-connected; the power supply module U1 is used as a main power supply to supply power normally, the power supply module U2 is used as a redundant backup power supply, and the positive end of the output end is directly connected in parallel and is connected with the positive end of the power supply output; the power supply module U1 is used as a main power supply, and the output negative terminal is controlled by an N-channel MOSFET switching tube and then connected with the output; the power supply module U1 is used as a main power supply, and the output of the power supply controls the output of the switch tube Q1 after voltage division; the power supply module U1 is used as a main power supply, and the output of the power supply is controlled to turn off the output of a switch tube Q2 of the power supply module U2 after voltage division; the power supply module U1 is used as a main power supply, the power supply output is controlled to turn off the enabling end of the power supply module U2 after voltage division, and the output of the standby power supply module U2 is turned off; the power supply module U1 is used as a main power supply, and the resistance values and the number of the voltage dividing resistors R4 and R5 of the power supply output switch tube Q2 can be increased; the power supply module U2 is as standby power supply, and when the input power supply is normal, and main power U1 does not have the output, power enable end connects the low level, and power U2 exports, and switch tube Q3 switches on, and the power output supplies power.
When the power supply module U1 is stable, the power supply module U1 and the power supply module U2 work simultaneously, the output of the power supply module U2 is turned off, and when the power supply module U1 has no output abnormality, the power supply module U2 is automatically turned on. Only one of U1 and U2 works.
Referring to fig. 1, the circuit of the present invention is shown schematically. An input voltage-dividing and voltage-stabilizing circuit is formed by input ends R1, R2 and D1 and supplies power to the grid electrode of an N-channel MOSFET switch tube, the switch tube supplies power through small current of an internal body diode, when the switch tube is conducted, the internal body diode is bypassed, and the power is normally supplied by a drain-source electrode of the N-channel MOSFET. When the positive end and the negative end of the direct-current power supply input are reversed, the switching tube Q1 is not conducted, the power supply modules U1 and U2 have no input voltage, and the power supply does not work;
when a direct-current power supply is normally input, the main power supply module U1 and the standby power supply module U2 are simultaneously powered on and output, the main power supply indicator lamp D2 and the standby power supply indicator lamp D5 are simultaneously lightened, when the main power supply module is normal, a corresponding circuit of the main power supply turns off the output of a switching tube Q3 of the power supply module 2 through an NPN transistor Q4, and simultaneously turns off the standby power supply module U2 through an optical coupler U3 to turn off the modules, so that the standby power consumption is reduced;
when the direct-current power supply is normally input and the main power supply module U1 does not output, the switch tube Q2 for controlling the power supply output is turned off, the signal for turning off the output of the standby power supply U2 fails, the standby power supply U2 is turned on, the switch tube Q3 is turned on, and the standby power supply module provides power.
When the main power supply module U2 is restored to normal, the standby power supply module U2 is automatically turned off, and power is continuously supplied by the main power supply module.
The above-mentioned embodiments are merely illustrative, not restrictive, of the present invention, and any practical creation that does not depart from the scope of the utility model will fall within the scope of the present invention.
Claims (7)
1. A low-loss redundant operation circuit of a switching power supply is characterized in that: the power supply comprises two negative logic control switch power supply modules U1 and U2, wherein U1 is used as a main power supply, U2 is used as a redundant standby power supply, an enabling end is connected with a low-level module to work, and a direct-current 4V-direct-current 50V high-level or suspension module is switched off;
the negative ends of the input ends of U1 and U2 are in no damage and reverse connection prevention by adopting a switch tube Q1; the positive ends of the power supplies of the output ends of the U1 and the U2 are directly connected in parallel and are connected with the positive end of the power supply output;
the U1 is used as a main power supply, the power supply output controls the output of the switch tube Q1 after voltage division, and the U1 output controls the output of the switch tube Q2 of the U2 to be turned off; when the U1 outputs normally, the U2 negative terminal output switching tube Q3 is turned off through the switching tube Q4, and the U2 output is turned off through the isolation control of the optocoupler U3;
when the U1 outputs, the ENA is enabled by controlling the U2 power supply; when the U1 has no output, the U2 is automatically switched; when the U1 returns to normal, the U1 continues to be used as a main power supply output, and the power supply module U2 is turned off;
when the power supply is just connected, the U1 and the U2 work at the same time to form a power supply module, and when the U1 works normally, the U2 is switched off;
the switching tube Q2 is in an off state when the power supply module U1 has no output;
the switching tube Q3 is in an off state when the power module U2 has no output.
2. The switching power supply low-loss redundant operation circuit according to claim 1, wherein: the power supply modules U1 and U2 are of the same type, the input direct-current voltage is lower than 800V, and the power supply modules output direct-current voltage; the power module is a negative logic N type or a positive logic P type, the negative logic N type power module enables the power module to work when the enabling end is connected with a low level, and the power module is switched off when the enabling end is suspended or connected with a high level; and the P-type power supply module works when the enabling end is suspended or connected with a high level, and the power supply is turned off when the enabling end is grounded.
3. The switching power supply low-loss redundant operation circuit according to claim 1, wherein: the switching tube Q1, the switching tube Q2 and the switching tube Q3 are N-channel MOSFETs, and the Q4 is an NPN-type transistor.
4. The switching power supply low loss redundant operation circuit according to claim 1 or 2, wherein: the negative end of the input end of the power supply module is reversely connected with a switching tube Q1, and the drain-source voltage withstand voltage Vds, the grid voltage dividing resistors R1 and R2 and the voltage stabilizing diode D1 of the switching tube change according to the direct current input voltage.
5. The switching power supply low loss redundant operation circuit according to claim 1 or 2, wherein: the negative end of the output end of the power supply module U1 is provided with an anti-reverse switch tube Q2, and the drain-source voltage withstand voltage Vds, the grid voltage dividing resistors R4 and R5 and the voltage stabilizing diode D3 change according to the direct current output voltage.
6. The switching power supply low loss redundant operation circuit according to claim 1 or 2, wherein: the negative end of the output end of the power supply module U2 is provided with an anti-reverse switch tube Q3, and the drain-source voltage withstand voltage Vds, the grid voltage dividing resistors R10 and R11 and the voltage stabilizing diode D6 change according to the direct current output voltage.
7. The switching power supply low-loss redundant operation circuit according to claim 1, wherein: the output end of the power supply module U1 controls the enabling end of the U2 to switch off the power supply module through a control optocoupler U3, and the current transmission ratio CTR of the isolation control optocoupler is larger than 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121617593.8U CN216121903U (en) | 2021-07-15 | 2021-07-15 | Low-loss redundancy operation circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121617593.8U CN216121903U (en) | 2021-07-15 | 2021-07-15 | Low-loss redundancy operation circuit of switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN216121903U true CN216121903U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121617593.8U Active CN216121903U (en) | 2021-07-15 | 2021-07-15 | Low-loss redundancy operation circuit of switching power supply |
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| Country | Link |
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| CN (1) | CN216121903U (en) |
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- 2021-07-15 CN CN202121617593.8U patent/CN216121903U/en active Active
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