CN215733649U - High-reliability UPS seamless switching device - Google Patents
High-reliability UPS seamless switching device Download PDFInfo
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- CN215733649U CN215733649U CN202122036139.XU CN202122036139U CN215733649U CN 215733649 U CN215733649 U CN 215733649U CN 202122036139 U CN202122036139 U CN 202122036139U CN 215733649 U CN215733649 U CN 215733649U
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Abstract
The utility model provides a high-reliability seamless switching device for a UPS (uninterrupted Power supply), which comprises: CPU circuit, DC/DC power, switching circuit, assembled battery; the CPU circuit comprises a hardware detection circuit, a CAN communication circuit, a drive circuit and a PWM control circuit; the hardware detection circuit is connected with an external high-voltage direct current output end, and the input end and the output end of the PWM control circuit are respectively connected with the hardware detection circuit and the input end of the drive circuit; the CAN communication circuit is connected with the DC/DC power supply, the output end of the driving circuit is connected with the switching circuit, the positive end of the battery pack is connected with the switching circuit, the negative end of the battery pack is connected with the output negative end of the DC/DC power supply, and the output end of the switching circuit is connected with the output positive end of the DC/DC power supply. The high-reliability seamless switching device for the UPS power supply provided by the utility model designs an integral circuit structure comprising the driving circuit and the switching circuit, realizes a double-insurance control and switching mechanism through the matching linkage of the switching circuit and other circuits, and improves the speed and reliability of power supply switching.
Description
Technical Field
The utility model relates to the technical field of UPS power supply, in particular to a high-reliability seamless switching device for a UPS power supply.
Background
A UPS (Uninterruptible Power System), which is an Uninterruptible Power supply including an energy storage device, is a commonly used UPS Power supply that supplies a regulated voltage to a load, and is an ac voltage stabilizer and also charges an internal battery at the same time; when the commercial power is interrupted, the UPS immediately supplies the direct current electric energy of the battery to the load by a method of switching and converting the inverter to continuously supply alternating current to ensure that the load keeps normal work and protects load software and hardware from being damaged.
Most of the existing launching vehicles are power battery packs or high-voltage direct-current generators, and the related testing equipment in the vehicles are low-voltage equipment, so that high-voltage electricity needs to be converted into low-voltage electricity needed by low-voltage equipment in the vehicles. Particularly, when relevant tests are carried out in the field, when the power supply of the current stage is abnormal or the conversion equipment is abnormal, the control system of the later stage can timely store relevant faults, and meanwhile, the relevant tests can be continuously carried out, so that a UPS power supply is required to be added at the power supply position of the key equipment, and the reliability is improved.
When the power supply of the front stage is abnormal or the conversion equipment is abnormal, the battery can be switched into the system in time before the output voltage is reduced to a certain degree; the switching is too slow, which can cause the problems of restart of a post-stage system, frequent fault occurrence, abnormal test and the like. However, the reliability and real-time performance of the conventional UPS power supply need to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high-reliability seamless switching device for a UPS (uninterrupted Power supply), aiming at the current situation that the reliability and the real-time performance of the existing UPS technology are to be improved.
The utility model provides a high-reliability seamless switching device for a UPS (uninterrupted Power supply), which comprises: CPU circuit, DC/DC power, switching circuit, assembled battery;
the CPU circuit comprises a hardware detection circuit, a CAN communication circuit, a drive circuit and a PWM control circuit; the hardware detection circuit is connected with an external high-voltage direct current output end, and the input end and the output end of the PWM control circuit are respectively connected with the hardware detection circuit and the input end of the drive circuit; the CAN communication circuit is connected with the DC/DC power supply, the output end of the driving circuit is connected with the switching circuit, the positive end of the battery pack is connected with the switching circuit, the negative end of the battery pack is connected with the output negative end of the DC/DC power supply, and the output end of the switching circuit is connected with the output positive end of the DC/DC power supply.
According to the high-reliability UPS seamless switching device provided by the utility model, the CAN communication circuit comprises a power chip, a magnetic isolator and a CAN transceiver; the power chip provides a power supply for 5V-to-5V isolation, the power supply supplies power to a primary end and a secondary end of the magnetic isolator, the magnetic isolator transmits signals of the primary end to the secondary end in an isolation mode, and then the CAN transceiver is used for realizing communication with the DC/DC power supply.
According to the high-reliability seamless switching device for the UPS, which is provided by the utility model, the switching circuit is composed of four MOS tubes, wherein two MOS tubes are connected in parallel to form a first MOS tube group, the other two MOS tubes are connected in parallel to form a second MOS tube group, and the first MOS tube group is connected with the second MOS tube group in series.
According to the high-reliability UPS seamless switching device provided by the utility model, the MOS tube internally comprises the body diode.
According to the high-reliability UPS seamless switching device provided by the utility model, the driving circuit comprises a hardware protection and input circuit, a power monitoring circuit, a fault signal feedback circuit and a driving module; the power supply monitoring circuit monitors the power supply of the PWM control circuit; the hardware protection and input circuit receives the output signal of the PWM control circuit, the monitoring signal of the power supply monitoring circuit and the signal of the fault signal feedback circuit, and the three signals are processed and then serve as the input signal of the driving module.
According to the high-reliability UPS seamless switching device provided by the utility model, the driving circuit further comprises a power supply circuit, and the power supply circuit provides positive and negative power supplies for the driving module.
According to the high-reliability UPS seamless switching device provided by the utility model, the driving circuit further comprises a fault signal detection circuit, the fault signal detection circuit detects the over-current information of the MOS tube in real time and sends the over-current information to the driving module for processing, and the signal processed by the driving module is fed back to the control end of the PWM control circuit through the fault signal feedback circuit and is simultaneously fed back to the hardware protection and input circuit.
According to the high-reliability UPS seamless switching device provided by the utility model, the driving circuit further comprises a driving output circuit and an amplitude limiting and filtering circuit; the drive output circuit is used for amplifying and limiting the current of the output signal of the drive module; the amplitude limiting and filtering circuit is used for realizing amplitude limiting and filtering of the output signal of the driving module.
According to the high-reliability UPS seamless switching device provided by the utility model, an optical coupler is arranged inside the input end of the driving module.
The utility model provides a high-reliability seamless switching device for a UPS (uninterrupted Power supply), which designs an integral circuit structure comprising a driving circuit and a switching circuit, realizes a double-insurance control and switching mechanism by the matching linkage of two MOS (metal oxide semiconductor) tube groups in the switching circuit and other circuits, and improves the speed and reliability of power supply switching.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following will briefly introduce some drawings needed to be used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an overall circuit logic block diagram of the present invention;
FIG. 2 is a circuit schematic of the CAN communication circuit of the present invention;
FIG. 3 is a circuit schematic of the drive circuit of the present invention;
FIG. 4 is a circuit schematic of the switching circuit of the present invention;
in fig. 3: 1. a drive module; 2. a power supply circuit; 3. a power supply monitoring circuit; 4. a hardware protection and input circuit; 5. a fault signal detection circuit; 6. a fault signal feedback circuit; 7. a drive output circuit; 8. clipping and filtering circuits.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a high-reliability seamless switching device for a UPS (uninterrupted Power supply), which comprises: CPU circuit, DC/DC power, switching circuit, assembled battery;
the CPU circuit comprises a hardware detection circuit, a CAN communication circuit, a drive circuit and a PWM control circuit; the hardware detection circuit is connected with an external high-voltage direct current output end, and the input end and the output end of the PWM control circuit are respectively connected with the hardware detection circuit and the input end of the drive circuit; the CAN communication circuit is connected with the DC/DC power supply, the output end of the driving circuit is connected with the switching circuit, the positive end of the battery pack is connected with the switching circuit, the negative end of the battery pack is connected with the output negative end of the DC/DC power supply, and the output end of the switching circuit is connected with the output positive end of the DC/DC power supply.
Fig. 1 is a logic block diagram of an overall circuit of the present invention, and as shown in fig. 1, an input end of the present invention is connected to an external high voltage direct current, and in an application scenario of a launch vehicle, the external high voltage direct current is a power battery pack or a direct current generator, an output end of the external high voltage direct current is connected to an input of a DC/DC power supply, and a 28V low voltage power supply required by a rear-stage single machine is converted by the DC/DC power supply. The CPU circuit comprises a hardware detection circuit, a CAN communication circuit, a drive circuit and a PWM control circuit. The hardware detection circuit is connected with the output of external high-voltage direct current, the input end and the output end of the PWM control circuit are respectively connected with the input ends of the hardware detection circuit and the drive circuit, the CAN communication circuit is connected with a CAN communication module of the DC/DC power supply, the output end of the drive circuit is connected with the switching circuit, the positive end of the battery pack is connected with the switching circuit, the negative end of the battery pack is connected with the output negative end of the DC/DC power supply, and the output end of the switching circuit is connected with the output positive end of the DC/DC power supply.
The CAN communication circuit comprises a power chip, a magnetic isolator and a CAN transceiver; the power chip provides a power supply for 5V-to-5V isolation, the power supply supplies power to a primary end and a secondary end of the magnetic isolator, the magnetic isolator transmits signals of the primary end to the secondary end in an isolation mode, and then the CAN transceiver is used for realizing communication with the DC/DC power supply.
Fig. 2 is a schematic circuit diagram of the CAN communication circuit of the present invention. In one embodiment, an N26 bit power chip provides a power supply for 5V to 5V isolation to supply power to a primary end and a secondary end of a magnetic isolator, the magnetic isolator transmits signals of the primary end to the secondary end in an isolation mode, and then communication with a DC/DC power supply is achieved through a CAN transceiver D18, physical isolation is achieved thoroughly, anti-interference capability is high, and communication reliability is high.
The driving circuit comprises a hardware protection and input circuit, a power supply monitoring circuit, a fault signal feedback circuit and a driving module; the power supply monitoring circuit monitors the power supply of the PWM control circuit; the hardware protection and input circuit receives the output signal of the PWM control circuit, the monitoring signal of the power supply monitoring circuit and the signal of the fault signal feedback circuit, and the three signals are processed and then serve as the input signal of the driving module.
The driving circuit further comprises a power supply circuit, and the power supply circuit provides positive and negative power supplies for the driving module.
The drive circuit further comprises a fault signal detection circuit, the fault signal detection circuit detects the over-current information of the MOS tube in real time and sends the over-current information to the drive module for processing, and the signal processed by the drive module is fed back to the control end of the PWM control circuit through the fault signal feedback circuit and is fed back to the hardware protection and input circuit at the same time.
The driving circuit also comprises a driving output circuit and an amplitude limiting and filtering circuit; the drive output circuit is used for amplifying and limiting the current of the output signal of the drive module; the amplitude limiting and filtering circuit is used for realizing amplitude limiting and filtering of the output signal of the driving module.
An optical coupler is arranged in the input end of the driving module.
FIG. 3 is a schematic circuit diagram of the driving circuit of the present invention, and as shown in FIG. 3, in one embodiment, the driving module 1 preferably employs M57962AL chips; the power supply circuit 2 comprises a VEE power supply, a VDD power supply and capacitors C7-C10; the power supply monitoring circuit 3 comprises a power supply control chip U1 and an input circuit consisting of resistors R1, R2 and R3 and capacitors C1, C2 and C3; the hardware protection and input circuit 4 comprises an AND gate circuit U2 and a NOT gate circuit U3 which are connected in series; the fault signal detection circuit 5 is formed by connecting a voltage-regulator tube D4 and a diode D1 in series, and the Ud is connected to the drain electrode of a controlled power switch tube MOS tube; the fault signal feedback circuit 6 comprises an optical coupling circuit consisting of an optical coupling device U5 and resistors R6 and R7, and F1 is connected to the control end of the PWM control circuit; the driving output circuit 7 comprises a complementary circuit consisting of a switching transistor Q1 and a switching transistor Q2, and a current limiting circuit consisting of resistors R8 and R9; the amplitude limiting and filtering circuit 8 comprises two voltage-stabilizing tubes D2 and D3 which are connected in series in an inverted mode, and the Ug is connected to the grid electrode of the controlled power switch tube IGBT.
The power supply circuit 2 provides positive and negative power supplies for the driving module 1; the power supply monitoring circuit 3 monitors the power supply of the PWM control circuit; the hardware protection and input circuit 4 receives an output signal of the PWM control circuit, a monitoring signal of the power supply monitoring circuit 3 and a signal of the fault signal feedback circuit 6, and integrates the three signals to be an input signal of the driving module 1 after the three signals are processed; the fault signal detection circuit 5 detects the over-current information of the MOS tube in real time and sends the over-current information to the drive module 1 for processing, and the signal processed by the drive module 1 is fed back to the control end of the PWM control circuit through the fault signal feedback circuit 6 and is simultaneously fed back to the hardware protection and input circuit 4; the drive output circuit 7 amplifies and limits the current of the output signal of the drive module 1; the amplitude limiting and filtering circuit 8 realizes amplitude limiting and filtering of the output signal.
The power supply circuit 2 is connected with the ends 4 and 6 of the driving module 1, and provides positive and negative power supplies for the driving module 1, so that the MOS tube is ensured to be rapidly switched on and switched off, and meanwhile, the switching-on and switching-off loss can be reduced. The power supply monitoring circuit 3 is connected with the control end of the PWM control circuit and used for monitoring the power supply voltage of the PWM control circuit, so that the accuracy of the control signal of the PWM control circuit is ensured. The hardware protection and input circuit 4 is connected with the output end of the PWM control circuit, receives the control signal of the PWM control circuit as the input signal of the driving module 1, wherein the hardware protection and input circuit 4 synthesizes the control signal from the PWM control circuit, the power monitoring signal of the power monitoring circuit 3, and the feedback signal of the fault signal feedback circuit 6, and sends the signals to the driving module 1 after performing and operation.
The fault signal detection circuit 5 is used for detecting whether the output (namely, the MOS tube) of the driving module 1 is over-current or not, is connected with the end 1 of the driving module 1, and feeds back the output to the control end of the PWM control circuit through the comparison of the driving module 1 and the fault signal feedback circuit 6, and feeds back to the hardware protection and input circuit 4.
The driving output circuit 7 is connected with the 5 end of the driving module 1, and the driving output circuit 7 comprises a power amplifying circuit and a current limiting circuit, wherein the power amplifying circuit is a switching triode Q1 and a switching triode Q2 which work in complementary states. The current limiting circuit is composed of current limiting resistors R8 and R9. The amplitude limiting and filtering circuit 8 comprises a voltage regulator tube D2 and a voltage regulator tube D3 which are connected in series in an opposite direction, and a filtering circuit which consists of a resistor R10 and a capacitor C11.
When the utility model works, the inner parts of the input ends 13 and 14 of the driving module 1 are provided with the optical couplers, when the end 13 receives the input signal of the hardware protection and input circuit 4 and is low, the end 5 of the driving module 1 outputs high level (VDD level), and when the end 13 receives the input signal of the hardware protection and input circuit 4 and is high, the end 5 of the driving module 1 outputs low level (VEE level).
When the driving module 1 detects that the voltage of the end 1 is 7V, the driving module 1 judges that the IGBT is short-circuited, immediately outputs a fault signal to the control end of the PWM control circuit through the end 8 of the driving module 1 through the fault signal feedback circuit 6, and the PWM control circuit performs corresponding processing. Meanwhile, the fault signal feedback circuit 6 feeds the fault signal back to the hardware protection and input circuit 4, and the input end of the driving module 1 is high through the inversion of the and gate circuit U2 and the not gate circuit U3, so that the MOS transistor is turned off in time, and the function of protecting the MOS transistor is achieved. When power supply (VCC) of PWM control circuit is abnormal (if voltage is too low), the interior of PWM control circuit is out of control, the output PWM signal is out of control, output signal is abnormal, the circuit of control will be affected at this moment, power monitoring circuit 3 monitors the voltage of PWM control circuit, when voltage is abnormal, power monitoring circuit 3 will output signal to hardware protection and input circuit 4 immediately, hardware protection and input circuit 4 makes the input of drive module 1 be the high level through AND gate circuit U2 and NOT gate circuit U3's reversal, realize in time shutting off the MOS pipe, play the effect of protection MOS pipe.
The power amplification circuit in the driving output circuit 7 amplifies the output signal through a complementary circuit formed by switching triodes Q1 and Q2, so that the driving capability is improved, current limiting is realized through resistors R8 and R9, and the IGBT is protected. The voltage stabilizing tube D2 and the voltage stabilizing tube D3 of the amplitude limiting and filtering circuit 8 have the function of ensuring that the IGBT is reliably switched on and off; the filter circuit resistor R10 and the capacitor C11 are used for filtering the output signal and protecting the IGBT from electrostatic breakdown.
The switching circuit is composed of four MOS tubes, wherein two MOS tubes are connected in parallel to form a first MOS tube group, the other two MOS tubes are connected in parallel to form a second MOS tube group, and the first MOS tube group is connected with the second MOS tube group in series. The MOS transistor internally includes a body diode.
Fig. 4 is a schematic circuit diagram of the switching circuit of the present invention, and as shown in fig. 4, in one embodiment, the switching circuit is composed of four MOS transistors, in which V1 and V3 are connected in parallel as a first MOS transistor group a1, and V2 and V4 are connected in parallel as a second MOS transistor group a 2. A1 was used in series with A2. Control signals G1/S and G2/S of the MOS tube are respectively connected with the output end of the drive circuit, and the drive circuit realizes drive control of the MOS tube in the switching circuit. The positive output end of the battery pack is connected with the point A of the input end of the switching circuit, and the negative output end of the battery pack is directly connected with the negative output end of the DC/DC power supply. The output end B point of the switching circuit is connected with the output positive end of the DC/DC power supply, and only the control of the output positive end of the DC/DC power supply is realized in the switching process.
When the system works, the V2 and the V4 are in a closed state, and the V1 and the V3 are in an open state, so that the reduction of the service life of the battery caused by the long-term parallel connection of the battery and the output is avoided; when the input voltage is abnormal, the hardware detection circuit detects the input abnormality and can drive the V1 and V3 to be rapidly switched on, before the V1 and the V3 are switched on, the output voltage is reduced from 28V, when the output voltage is reduced to the voltage of the battery pack, the voltage of the battery pack is seamlessly switched through the body diodes in the V1 and the V3 due to the existence of the body diodes in the V1 and the V3, the load current is possibly large and can not be overcurrent from the diodes for a long time, and at the moment, the V1 and the V3 are rapidly closed through the hardware detection circuit, so that one-time switching of the circuit is realized, and the normal power supply of a rear stage is ensured.
The control principle of double insurance:
the system is electrified, the CPU circuit is started, whether the input voltage is normal or not is firstly detected, after the input voltage is normal, the DC/DC power supply output is started under the condition of high-voltage input, at the moment, the CPU circuit detects the voltage of the battery pack due to the high-voltage input, and when the voltage of the battery pack is too low, the charging circuit is started to charge the battery pack by utilizing the output of the DC/DC power supply. As shown in FIG. 4, the CPU circuit is in a normally closed state by controlling the MOS transistors V2 and V4 to pull in through the driving circuit.
Double insurance operation during switchingThe principle is as follows:
when the high-voltage input is suddenly cut off, before the software sends out an enabling signal, the hardware detection circuit detects that the input voltage is lower than a certain value, the enabling driving circuit closes the MOS tubes V1 and V3, and due to the fact that the body diodes are arranged inside the MOS tubes, when the output voltage of the DC/DC power supply is lower than the voltage of the battery pack, the voltage is seamlessly switched through the body diodes of V2, V4, V1 and V3, and the output of the DC/DC power supply is switched to the output of the battery pack. When the load is large, the body diode has certain heat productivity and is not suitable for long-term operation, so that the MOS tubes V1 and V3 can be closed by the timely enabling driving circuit of the hardware detection circuit.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A high reliability UPS seamless switching device which characterized in that includes: CPU circuit, DC/DC power, switching circuit, assembled battery;
the CPU circuit comprises a hardware detection circuit, a CAN communication circuit, a drive circuit and a PWM control circuit; the hardware detection circuit is connected with an external high-voltage direct current output end, and the input end and the output end of the PWM control circuit are respectively connected with the hardware detection circuit and the input end of the drive circuit; the CAN communication circuit is connected with the DC/DC power supply, the output end of the driving circuit is connected with the switching circuit, the positive end of the battery pack is connected with the switching circuit, the negative end of the battery pack is connected with the output negative end of the DC/DC power supply, and the output end of the switching circuit is connected with the output positive end of the DC/DC power supply.
2. The seamless switching arrangement of claim 1 wherein the CAN communication circuit comprises a power chip, a magnetic isolator, a CAN transceiver; the power chip provides a power supply for 5V-to-5V isolation, the power supply supplies power to a primary end and a secondary end of the magnetic isolator, the magnetic isolator transmits signals of the primary end to the secondary end in an isolation mode, and then the CAN transceiver is used for realizing communication with the DC/DC power supply.
3. The seamless switching device for the UPS power supply of claim 1, wherein the switching circuit comprises four MOS transistors, two of which are connected in parallel to form a first MOS transistor set, and two of which are connected in parallel to form a second MOS transistor set, and the first MOS transistor set is further connected in series with the second MOS transistor set.
4. A high reliability UPS power supply seamless switching arrangement according to claim 3, wherein said MOS transistors include a body diode inside.
5. The seamless switching device for the UPS according to claim 3, wherein the driving circuit comprises a hardware protection and input circuit, a power monitoring circuit, a fault signal feedback circuit and a driving module; the power supply monitoring circuit monitors the power supply of the PWM control circuit; the hardware protection and input circuit receives the output signal of the PWM control circuit, the monitoring signal of the power supply monitoring circuit and the signal of the fault signal feedback circuit, and the three signals are processed and then serve as the input signal of the driving module.
6. The apparatus of claim 5, wherein the driving circuit further comprises a power supply circuit, the power supply circuit providing both positive and negative power to the driving module.
7. The seamless switching device for the UPS according to claim 6, wherein the driving circuit further comprises a fault signal detection circuit, the fault signal detection circuit detects the over-current information of the MOS transistor in real time and sends the over-current information to the driving module for processing, and the signal processed by the driving module is fed back to the control end of the PWM control circuit through the fault signal feedback circuit and is simultaneously fed back to the hardware protection and input circuit.
8. The apparatus of claim 7, wherein the driving circuit further comprises a driving output circuit and a limiting and filtering circuit; the drive output circuit is used for amplifying and limiting the current of the output signal of the drive module; the amplitude limiting and filtering circuit is used for realizing amplitude limiting and filtering of the output signal of the driving module.
9. A high reliability seamless switching arrangement for UPS power supplies according to claim 5, wherein the input of the driving module is internally an optocoupler.
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| CN202122036139.XU CN215733649U (en) | 2021-08-26 | 2021-08-26 | High-reliability UPS seamless switching device |
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| CN202122036139.XU CN215733649U (en) | 2021-08-26 | 2021-08-26 | High-reliability UPS seamless switching device |
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