CN212380994U - UPS for low-power embedded equipment - Google Patents

Abstract

The utility model discloses a UPS for miniwatt embedded equipment relates to power control equipment technical field, can increase the design complexity and break down and be difficult to the problem invention of maintenance and change for solving to place in the embedded equipment in current. This UPS is including PFC module, LLC resonance module, synchronous rectifier module, the management module of charging, battery pack module, battery pack management module, DC/DC power supply channel control module and DC/DC output module that connects gradually, synchronous rectifier module and the management module of charging all with DC/DC power supply channel control module links to each other, battery pack management module is the control connection still charge the power supply channel between management module and the battery pack module, and the power supply channel between DC/DC power supply channel control module and the battery pack module. The conventional power supply can be rectified and reduced to 12VDC or 5VDC, and power can be continuously output to the loaded equipment in the case of power failure or abnormity, and the method is independent of the embedded equipment.

Description

UPS for low-power embedded equipment

Technical Field

The utility model relates to a power control equipment, concretely relates to UPS for miniwatt embedded equipment.

Background

With the development of the internet of things, more and more embedded devices are entering various places of national production and life and are applied to various fields, such as signal acquisition, network communication, monitoring terminals, electrical control, intelligent application and the like. These embedded devices have strict requirements for power supply, typically 12VDC or 5VDC as power supply and for power supply voltage deviation and voltage ripple, thereby ensuring that the embedded devices can operate continuously and stably without sudden signal loss, disconnection, shutdown, etc.

In the conventional embedded equipment capable of continuously and stably operating, equipment shutdown caused by sudden power failure of a 220VAC/50Hz power supply is usually avoided through a scheme of a built-in UPS module. This solution for providing backup power to embedded devices has the following drawbacks: firstly, the design complexity of the embedded equipment can be increased by arranging the UPS module in the embedded equipment; secondly, because the service life of the UPS module limited by the prior battery technology is greatly different from that of the main circuit of the embedded device, the overall service life of the embedded device is often reduced after the UPS module is built inside the embedded device, that is, the main circuit is still in a good state, but the whole embedded device cannot work due to the damage of the UPS module, and the internal UPS module is difficult to maintain and replace for users, thereby increasing the use cost of the embedded device.

It can be seen that there is a great need for a UPS that is independent of the body of the embedded device and is capable of converting voltage and is suitable for powering the embedded device.

Disclosure of Invention

In view of the above, the present invention provides a UPS for a low power embedded device, which is used to solve the problems that the design complexity of the embedded device itself is increased and the embedded device is difficult to maintain and replace due to failure in the existing UPS module.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the UPS for the low-power embedded equipment comprises a PFC module, an LLC resonance module, a synchronous rectification module, a charging management module, a cell group management module, a DC/DC power supply channel control module and a DC/DC output module which are sequentially connected, wherein the synchronous rectification module and the charging management module are both connected with the DC/DC power supply channel control module;

the PFC module is used for rectifying input alternating current into direct current and carrying out filtering, quasi-resonance boosting processing and AC input power factor improvement processing;

the LLC resonance module is used for converting the DC current boosted by the PFC module into a half-sine sequence waveform current through an MOSFET half bridge and transmitting the half-sine sequence waveform current to the synchronous rectification module;

the synchronous rectification module is used for rectifying and stabilizing the half sine sequence waveform current generated by the step-down conversion of the secondary side winding of the transformer, and the output is divided into two paths: one path of output is output to the charging management module and is used for charging the cell pack module; the other path of the power is output to the DC/DC power supply channel control module and is used as one of the power supply inputs of the DC/DC output module;

the charging management module charges the cell group module according to the electric quantity saturation of the cell group module and the channel control state of the cell group management module;

the battery pack management module controls the switch of the MOSFET according to the voltage and the current of the battery cells in the battery pack module and the over-protection state of the components in the module circuit;

the DC/DC power supply channel control module is used for automatically selecting one path among the bypass power supply output of the battery cell group module and the charging management module and the output of the synchronous rectification module to provide an input power supply for the DC/DC output module;

the DC/DC output module is used for outputting the current at the input end of the module to the low-power embedded equipment after DC/DC regulation and voltage stabilization treatment according to the set output voltage.

The PFC module comprises a bridge rectifier circuit and a PFC correction resonant circuit which are connected, the bridge rectifier circuit rectifies input alternating current into direct current and performs filtering processing, and the PFC correction resonant circuit performs resonance-like boosting processing and power factor correction on the direct current after rectification and filtering.

The battery pack management module is used for monitoring the electric quantity in the battery pack module and outputting electric quantity information to the low-power embedded equipment.

The LLC resonance module comprises a transformation coil winding, and the LLC resonance module transmits the power of half-sine sequence waveform current to the synchronous rectification module through the transformation coil winding.

The UPS panel is provided with an electric quantity indicating lamp, an SMBUS interface and an output voltage selection key, so that the set value of the output voltage can be switched between 12V and 5V.

The voltage of the input alternating current power supply is in the range of 100V-240V, and the frequency is 50Hz or 60 Hz.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a UPS for low-power embedded equipment not only can convert its rectification step-down into 12VDC or 5VDC direct drive load equipment after the AC power that the direct input voltage of power input port is in 100V ~ 240V's within range, frequency is 50H or 60Hz, can also be in AC power input outage and other abnormal conditions uninterruptedly for its equipment output power who loads to output voltage is invariable, voltage deviation is little, the ripple is low, has steady voltage's function to the equipment of its load; just the utility model provides a UPS has simplified the complexity that embedded equipment relates to and be convenient for maintain when breaking down, effectively extension equipment life outside being independent of embedded equipment.

Drawings

Fig. 1 is a system diagram of a UPS for a low power embedded device provided by the present invention;

fig. 2 is a schematic diagram of a bridge rectifier circuit in a UPS for a low power embedded device according to the present invention;

fig. 3 is a schematic diagram of a PFC correction type resonant circuit in a UPS for a low power embedded device according to the present invention;

fig. 4 is a schematic diagram of an LLC resonant module in a UPS for a low-power embedded device provided by the present invention;

fig. 5 is a schematic diagram of a synchronous rectification module in a UPS for a low power embedded device according to the present invention;

fig. 6 is a schematic diagram of a charge management module in a UPS for a low power embedded device according to the present invention;

fig. 7 is a schematic diagram of a management module for a cell group in a UPS for a low-power embedded device according to the present invention;

FIG. 8 is a schematic diagram of a DC/DC power channel control module in a UPS for low power embedded devices according to the present invention;

fig. 9 is a schematic diagram of a DC/DC output module in a UPS for a low power embedded device according to the present invention.

In the figure, a 1-PFC module, a 11-bridge rectifier circuit, a 12-PFC correction type resonance circuit, a 2-LLC resonance module, a 3-synchronous rectifier module, a 4-charging management module, a 5-battery pack module, a 6-battery pack management module, a 7-DC/DC power supply channel control module, an 8-DC/DC output module and a 9-low-power embedded device.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides a UPS for miniwatt embedded equipment, refer to fig. 1, including PFC module 1, LLC resonance module 2, synchronous rectifier module 3, charge management module 4, electric core group module 5, electric core group management module 6, DC/DC power supply channel control module 7 and DC/DC output module 8 that connect gradually, synchronous rectifier module 3 and charge management module 4 all with DC/DC power supply channel control module 7 links to each other, electric core group management module 6 still control connection the power supply channel between charge management module 4 and electric core group module 5 to and the power supply channel between DC/DC power supply channel control module 7 and electric core group module 5; the PFC module 1 is used for rectifying input alternating current into direct current and performing filtering, quasi-resonance boosting processing and AC input power factor improvement processing; the LLC resonance module 2 is used for converting the DC current boosted by the PFC module 1 into a half-sine sequence waveform current through a MOSFET half bridge and transmitting the half-sine sequence waveform current to the synchronous rectification module 3; the synchronous rectification module 3 is used for rectifying and stabilizing the half sine sequence waveform current generated by the step-down conversion of the secondary side winding of the transformer, and outputting the rectified current, wherein the output is divided into two paths: one path of output is sent to the charging management module 4, and is used for charging the battery cell group module 5; the other path of output is output to the DC/DC power supply channel control module 7 and is used as one of power supply inputs of the DC/DC output module 8; the charging management module 4 charges the cell group module 5 according to the electric quantity saturation of the cell group module 5 and the channel control state of the cell group management module 6; the electric core group management module 6 controls the switch of the charging and discharging channel MOSFET according to the voltage and the current of the electric core in the electric core group module 5 and the over-protection state of the components in the module circuit; the DC/DC power supply channel control module 7 is used for automatically selecting one of the bypass power supply outputs of the cell group module 5 and the charging management module 4 and the output of the synchronous rectification module 3 to provide an input power supply for the DC/DC output module 8; the DC/DC output module 8 is configured to output the current at the input end of the module to the low-power embedded device 9 after DC/DC adjustment and voltage stabilization according to a set output voltage.

The utility model provides a UPS for low-power embedded equipment not only can be with its rectification step-down for 12VDC or 5VDC direct drive load equipment behind the AC power of AC power input interface input voltage in 100V ~ 240V's within range, frequency be 50H or 60Hz AC power, can also be in AC power supply input port the power supply and other abnormal conditions under uninterruptedly for its equipment output power who loads to output voltage is invariable, voltage deviation is little, the ripple is low, has steady voltage's function to the equipment of its load; just the utility model provides a UPS has simplified the complexity that embedded equipment relates to and be convenient for maintain when breaking down, effectively extension equipment life outside being independent of embedded equipment.

The PFC module 1 first rectifies the input ac within the range of 100V-240V, 50Hz or 60Hz into dc, then performs filtering and quasi-resonant boost processing on the rectified dc, generally boosting the dc to 390V, and the boost processing is performed first due to the following considerations: the PFC module 1 boosts the output at a fixed value, so that the complexity of LLC and SR circuit design is reduced and the stability is improved; the high voltage is kept at the front part of the whole UPS system circuit, which is favorable for reducing the current passing through the circuit under the same power consumption, so that the requirement of a power device in the circuit on the overcurrent capacity can be reduced, the load capacity of the UPS is improved, and in addition, the treatment is favorable for reducing the volume of components in the front-end circuit and reducing the cost of the circuit (generally, the overcurrent capacity is positively correlated with the volume of the components). The PFC module 1 continuously senses a dynamic value of an input AC current through a PFC coil and reduces a phase difference between the current and the voltage by bypassing a switch of the PFC regulation MOSFET connected to the ground, thereby minimizing a drop in power factor due to an inductive device in a load. Specifically, the PFC module 1 includes a bridge rectifier circuit 11 and a PFC correction resonant circuit 12, which are connected to each other, where the bridge rectifier circuit 11 is configured to rectify an input ac into a dc and perform filtering processing, and the PFC correction resonant circuit 12 is configured to perform quasi-resonant boost processing on the rectified and filtered dc. In addition, the power input part of the UPS is subjected to surge prevention and lightning protection treatment, so that the UPS is prevented from being damaged when the power is input outside the UPS. Referring to fig. 2, the bridge rectifier circuit 11 operates according to the following principle: j1 is a 3-pin interface for 100V-240V, 50Hz/60Hz industrial frequency AC input, AC current enters the bridge rectifier circuit from the 1 and 3 pins of the interface, and the 2th pin is a protective grounding terminal. The fuse F1 performs overcurrent and open circuit protection on the incoming AC current; the inductors L1, L2 are used to suppress common mode interference in the AC current and the capacitor C1 is used to suppress transient voltages in the input current. The rectifier bridge BR1 realizes AC-to-DC conversion, and then performs voltage stabilization processing through a pi filter circuit composed of C2, C3 and L1. Referring to fig. 3, the working principle of the PFC rectifying resonant circuit 12 is as follows: the rectified DC current is PFC-regulated by the PFC control chip through MOSFET Q1 while passing through PFC coil L4 and schottky diode D1. The SNSCUR pin of the control chip and the internal circuit thereof sense the peak value of the current flowing through the PFC coil L4 through the resistor R4 and the current sensing resistor SR1, and the internal control circuit limits the maximum current passing through the PFC coil according to the measured current value. The SNSMAINS pin and the internal circuit sense the voltage on an input AC line through R1 and R3 and determine whether to start the PFC function according to the measured voltage; in addition, the SNSMAINS pin also determines whether to start the OTP (i.e. overheat protection) through a temperature sensing circuit consisting of D2, C7, R8 and NTC1, and the two functions are independently performed in different half-wave times of the input AC respectively. The C4 and the C5 are used as large-capacitance capacitors to provide filtering for PFC current. The SNSBOOST pin and the internal circuit thereof measure and feedback control the PFC output voltage through a voltage division circuit consisting of resistors R2, R6, R10 and a capacitor C6. The SNSAUX pin and its internal circuit sense the demagnetization timing and voltage valley time in the PFC coil through resistor R7, and adjust the switching signal driving PFC MOSFET Q12 according to these two parameters. The PFCCOMP pin and its internal circuitry and the circuitry consisting of C8, R9, and C9 are responsible for providing frequency compensation for the control loop. The magnetic beads FB1 and FB2 are connected with two different grounds, so that the influence of power circuit noise on the control chip is reduced. 120-240

As shown in fig. 4, the LLC resonant module 2 converts the DC current boosted by the PFC module 1 into a half-sine-sequence waveform current through a MOSFET half-bridge by means of a transformer coil winding, and transmits power to the synchronous rectification circuit through the transformer winding. The working principle is as follows: the SUPHV pin and the internal circuit absorb the output voltage of the PFC circuit through resistors R12 and R13 to serve as a high-voltage starting source, and the SUPIC circuit is charged by the power supply. The SUPIC pin and its internal circuitry accept the chip voltage input of the auxiliary winding T1B through R22, D8, which is provided with voltage filtering by C18 and C19. The SUPREG pin outputs externally a voltage adjusted by its internal circuit, which is used as a reference voltage for part of the external circuit and also used as a reference voltage for starting the under-voltage protection. The GATEHS and GATELS pins each drive the upper and lower MOSFETs Q2 and Q3 by their internal circuitry through a resistor diode current limiting protection circuit. One end of a primary side winding T1A of the transformer is connected with Q2 and Q3, the other end of the primary side winding is grounded through resonant capacitors C22 and C23, and the primary side winding and a secondary side winding T1C form an LLC resonant circuit to realize the transformation and conversion of power supply. The SNSCAP pin and the internal circuit thereof sense the voltage on resonant capacitors C22 and C23 of a primary side winding T1A through a resistance-capacitance composite type voltage division circuit consisting of C26, C27, C28, R28, R29 and R30, and the control chip controls the power output by the whole LLC circuit on the secondary side according to the sensed voltage. An internal circuit connected with the SNSCUR pin senses transient current passing through a primary side winding through a resistance-capacitance circuit, and the control chip judges whether the circuit needs to start OCP (over temperature protection) protection or enter a CMR (capacitive Mode regulation) Mode according to the measured current value. The SNSOUT pin and its internal circuit sense the output voltage of the resonant transformer through a voltage dividing circuit consisting of C15, R16, R17, R18 and D5. The HB and SUPHS pins sink current from the SUPREG output through C15, D3, which constitutes the start-up pilot circuit for the high-side MOSFET Q2. The SNSFB pin receives the load level connected to the secondary winding of the sensing transformer T1 through the optocoupler U3 and the resistor R19, and when the secondary winding of T1 is under low load or no load, the internal circuit connected to this pin will control the entire HBC output to enter a low power mode. The SNSSET pin and the internal circuit thereof set a low-power mode starting level, a protection mode and an overload protection starting level for the whole LLC circuit through a resistance-capacitance circuit; and also transmits a pg (power good) signal to the secondary side circuit through the MOS Q4 and the opto-coupler U4 circuit.

In addition, the synchronous rectification module 3 rectifies and stabilizes the voltage of the half sine sequence waveform current generated by the step-down conversion of the secondary side winding of the transformer. The output is divided into two paths, one path is supplied to the charging management module 4 for charging the cell group module 5; the other path is input into a DC/DC output module 8, and is used as DC power supply output to load low-power embedded equipment after voltage regulation and voltage stabilization processing. The power transfer and voltage conversion between LLC and SR is achieved by means of a transformer. As shown in fig. 5, the operation principle of the Synchronous Rectification (SR) module 3 is as follows: the transformer secondary side winding T1C receives the power transferred from the primary side winding T1A by the magnetic coupling effect and converts the power into an output current of a set voltage through synchronous rectification control under the action of electromagnetic induction. The VCC pin draws current from the power supply output end of the SR circuit, supplies power to the whole SR circuit control chip after being regulated by internal voltage of the SR circuit, and is used as a judgment reference for starting and stopping the chip according to the VCC voltage. The two pins of DSA and SSA and the internal circuit thereof are combined with R37 to sense the voltage difference between the drain and the source of the synchronous rectification MOSFET Q6, and the voltage difference is used for driving the gate of Q6 to realize the switch control, and the operation principle of DSB, SSB and R35 is the same. The GDA and its internal circuit are limited by R38 and then drive the gate of Q6, and the operation principle of GDB and R36 is the same.

Specifically, the charging management module 4 automatically converts the current output after the synchronous rectification into the charging current to charge the battery pack module 5 according to the saturation degree of the electric quantity in the battery pack module 5 and the switching state of the charging power supply channel. Referring to fig. 6, the working principle of the charging management module 4 is as follows: the ACRV pin and the internal circuit thereof drive N-type power MOSFETs Q7 and Q8 through a current-limiting resistor R44, and the on-off state between an external direct current input VADP and a system power supply VSYS is controlled; the CMSRC pin and its internal circuitry control the turn-on speed of Q7, Q8 via R46. Pins ACP, ACN and their internal circuitry, together with resistor SR2, form the sensing circuit for the control chip to the system input current, where capacitor C35 provides differential mode filtering for the measurement. The control chip provides a reference voltage of 3.3V to the outside through the VREF pin, and C43 filters the reference voltage. After voltage division processing is carried out on the reference voltage provided by the VREF pin, the ACSET pin and an internal circuit thereof acquire the divided voltage of VREF through R55 and R56, and the internal circuit of the control chip sets the maximum allowable value of the system input current by the divided voltage. Similarly, the TS pin and its internal circuit set the circuit overheat protection threshold through R50, R51, and SR 3; the charging current value in the fast charging mode is set by the ISET pin and the internal circuit thereof through R53 and R54. The STAT pin is externally connected with the light emitting diodes D15 and R48 and is driven by a reference voltage provided by the VREF pin, and an internal circuit of the STAT pin correspondingly lights the D15 according to the charging state. PVCC is an input pin of charging current; SW is the output pin of charging current and the charging inductance tie point, and its internal circuit charges the electric core group through this pin and charging inductance. The SRP, SRN pins and their internal circuitry sense the charging current value through SR4, with C40, C45 and C46 providing differential and common mode filtering, respectively. The OVPSET pin and the internal circuit thereof judge whether the input voltage meets the requirement of the working voltage of the control chip by measuring the partial pressure of the R45 and the R49 on the input voltage, and stop charging and turn off Q7 and Q8 if the measured input voltage is abnormal. R43 and C38 provide filtering for the input direct current VADP, and the magnetic bead FB4 connects the ground of the control chip and the ground of the power supply, so as to reduce the interference of the ground loop current to the control chip. The # BATDRV pin and the internal circuit thereof control the power MOS Q9 through R47, when the direct current input VADP is cut off and closed, the Q9 is turned on to realize the function of starting the standby power supply of the cell group, and the Schottky D14 is used as the standby conduction of the zero-delay cell group. The AVCC pin receives the direct current input of the VADP through the D13 and the R57 to supply power for the chip.

More specifically, the cell group management module 6 controls power supply channels between the charging management module 4 and the DC/DC output module 8 and the cell group module 5, and controls the switching of the MOSFET in the charging and discharging channel according to the voltage, current and temperature of each cell and the over-protection state of the components in the module circuit; . The protection circuit can effectively prevent unsafe charging and discharging from occurring, thereby achieving the purpose of protection. And, electric core group management module 6 still carries out the inside electric quantity of monitoring electric core group module 5, lights the LED pilot lamp according to the electric quantity correspondingly and shows to can send the electric quantity to the embedded equipment 9 that UPS carried with 2bit SMBUS digital interface. Referring to fig. 7, the operating principle of the cell group management module 6 is as follows: the VDD pin of the secondary voltage protection chip supplies power to the chip through a resistor R69, and the C57 provides filtering for the input power supply. The V1 pin and the internal circuit thereof sense the voltage between the positive electrode and the negative electrode of the 1 st-level battery cell of the battery cell group through R75, and C56 filters and stabilizes the voltage of the sensed battery cell; similarly, the V2 and V3 pins respectively sense the voltages between the positive and negative electrodes of the level 2 and level 3 cells. The OUT pin and its internal circuit control the on-off of the fuse F2 through the resistor R70 and the N-channel MOSFET Q14, and the R66 and the C53 suppress the transient voltage for this purpose. When any cell voltage sensed by the V1, the V2 and the V3 exceeds an overvoltage protection threshold value, an internal timing circuit starts timing, and before timing is finished, if the cell voltage does not drop below the overvoltage protection threshold value, an OUT pin function is activated and fuses a fuse F2 to cut off the connection of the positive electrodes of the cell group. The REG pin of the secondary voltage protection chip and its internal circuitry provide an OUT pin activation timing circuit, the duration of which is set by the capacitance of C51 connected to the REG pin. The battery cell management chip VC1 pin and the internal circuit thereof sense the voltage between the positive electrode and the negative electrode of the 1 st-level battery cell of the battery cell group through R80, and C62 filters and stabilizes the sensed battery cell voltage; similarly, the pins VC2 and VC3 respectively sense the inter-positive and inter-negative electrodes of the level 2 and level 3 cells. The TS1, TS2, TS3 pins and their internal circuits sense the temperatures of the battery cells BAT1, BAT2, BAT3 through the connected thermistors R81, R82, R83, respectively. The PTC pin and the internal circuit thereof sense the temperature of the MOSFETs Q12 and Q13 on the charging and discharging circuit through a Positive Temperature Coefficient (PTC) thermistor and control the switching states of the MOSFETs Q12 and Q13. The SRP and SRN pins and their internal circuitry sense the remaining charge of the cell pack through RCS 1. And the 5 LEDs connected with the pins LEDCNTA, LEDCNTB and LEDCNTC are used for displaying the electric quantity saturation of the electric core group. The SMBUS bus circuit inside the chip outputs data and a clock through the two pins of the SMBD and the SMBC respectively. The PACK, the VCC pins and the internal circuit thereof respectively supply power to the battery cell management chip from the charging input current VBAT through respective resistors connected in series. The CHG pin and the DSG pin respectively control a charging channel control switch MOSFET Q11 and a discharging channel control switch MOSFET Q12 through current limiting resistors R65 and R67 by internal circuits thereof; r60 and R62 are used to ensure that the gate drive circuits of Q11 and Q12 reliably cut off the charge and discharge source channel in the open state.

Referring to fig. 8, the DC/DC power supply channel control module 7 receives the bypass power output from the electric core pack module 5, the charging management module 4 and the output current of the synchronous rectification module 3, and automatically selects a power supply source of the DC/DC output module 8 among the three according to the states of the electric core pack module 5, the charging management module 4 and the synchronous rectification module 3. The working principle is as follows: a V1 pin supplies power and band-gap reference for a first power channel control circuit in the control chip and also provides voltage sensing input for a 1 st channel controller; the V2 pin provides power and a bandgap reference for the second power channel control circuit and also provides a voltage sense input for the 2 nd channel controller. The VS pin supplies power to all two power controllers in the control chip, and provides a band gap reference and a voltage sensing input. Pins G1 and G2 are control pins for power channel 1 and channel 2, respectively. The E1 pin acquires the input voltage of the 1 st channel through the R89 and R90 voltage dividing circuit, and if the input voltage is measured to be higher than the reference voltage, the control chip opens Q15 and Q16 through the G1 pin, so that the VADP can supply power to the load; otherwise, if the pin E1 has no input higher than the reference voltage (the 1 st power channel is not powered on or has too low voltage), it is determined whether the 2 nd channel has a power input meeting the output voltage threshold, if so, the pin G2 turns on Q17, otherwise, the pin Q17 is turned off. Any channel of the two channels has power input, so that the input voltage sensing and the channel control are automatically started. The priority principle of the control of the power supply channel of the DC/DC output module is as follows: the first power channel has priority, and the first power channel can supply power to the DC/DC output module as long as the synchronous rectification module connected with the first power channel has normal output; the second power supply channel is connected with the bypass output of the charging management module and the battery pack, when the charging management module is in a normal working state, the bypass output voltage is always higher than the voltage of the battery pack, and the internal control circuit can automatically turn off a channel MOSFET (metal oxide semiconductor field effect transistor) for the external discharge of the battery pack; and the battery pack replaces the bypass output and supplies power to the outside through the second power channel only when the charging management module stops working.

And the DC/DC output module 8 switches the output voltage between 12V and 5V according to the output voltage setting controlled by the output voltage switch key. As shown in fig. 9, the operating principle of the DC/DC output module 8 is as follows: the DC/DC output control chip is configured with 2 groups of high-side and low-side (4-path) MOSFET drive circuits, the drive circuits are output by pins HDRV1, LDRV1, HDRV2 and LDRV2, respectively correspond to control N-type MOSFETs Q18, Q19, Q21 and Q20, and are combined to be used for DC/DC conversion under 3 different modes of voltage reduction, voltage increase and current smoothing. The VISNS pin senses the voltage of an input power supply VDCD, the VOSNS pin senses the voltage of an output power supply 5V/12V _ DCOUT, and the internal voltage comparison circuit judges the mode (including voltage reduction, voltage boosting and smoothing) in which the whole DC/DC circuit needs to work according to the voltage comparison results of the input and output sections so as to select different MOSFET driving configurations. The FB pin senses the output voltage transmitted by the voltage dividing resistor network, and the comparison result of the feedback voltage and the internal reference voltage is fed back to control the PWM circuit by an internal circuit, so that the preset output voltage is realized.

In order to send a UPS working mode alarm and a UPS residual capacity shortage alarm to the low-power embedded equipment 9 loaded by the low-power embedded equipment, so as to help remind the running embedded equipment to save data in advance and prepare before power failure, the cell pack management module 6 is also used for monitoring the electric quantity inside the cell pack module 5 and outputting electric quantity information to the low-power embedded equipment 9.

In order to realize the support to 12V/5V dual voltage, the utility model provides a UPS for low-power embedded equipment still includes the UPS panel, output voltage switch key on the UPS panel is used for selecting output voltage's size. The voltage control of the DC/DC output module 8 is designed to be dial-selectable, and can be switched between 12VDC and 5VDC only by an output voltage selection key on the UPS panel, thereby supporting the two different supply voltages.

The utility model provides a UPS for embedded equipment of miniwatt has the mode of operation of power adaptation function and power adaptation: when the AC input of the UPS power input port is within the range of 100 VAC-240 VAC 50Hz/60Hz, the UPS automatically works in a power supply adaptation mode, and an adapter between a conventional 220V/50Hz AC power supply and the UPS is omitted.

It can be seen that, compare in the current numerous power supply scheme to the built-in UPS module of universal adoption in the embedded equipment that the real-time requirement is strict, the utility model provides a complete external power supply scheme is with among AC/DC conversion, lithium cell group charge-discharge management, the integrated design of functions such as lithium cell group electric quantity monitoring function, DC/DC steady voltage and UPS output control to same UPS. The UPS is used as a power supply scheme for the low-power embedded equipment 9, so that the overall size of a standby power supply system is reduced, and the cost is reduced. Adopt the utility model relates to an even if have embedded equipment that strong real-time nature required during the power supply scheme also need not built-in UPS module, help reducing the system complexity and the maintenance cost of this type of embedded equipment, the life of extension embedded equipment main part improves the convenient degree that whole embedded equipment system maintained.

The utility model also provides a control method for UPS of miniwatt embedded equipment, when input voltage is in 100V ~ 240V's within range, the frequency is 50H or when 60Hz power frequency power supply is normal online, DC/DC power supply channel control module 7 automatic selection the electric current of synchronous rectifier module 3 output and export 12V or 5V's DC/DC voltage regulation and voltage stabilizing treatment to it by DC/DC output module 8 export to miniwatt embedded equipment 9; when an input AC power supply is abnormal or is disconnected, the DC/DC power supply channel control module 7 automatically switches to the power supply from the battery cell group module 5, and the DC/DC output module 8 performs DC/DC voltage regulation and voltage stabilization of 12V or 5V output to the low-power embedded device 9. Promptly the utility model discloses the mode with power adaptation function and power adaptation: when the AC input of the UPS power input port is within the range of 100 VAC-240 VAC, 50Hz or 60Hz, the UPS automatically works in a power supply adaptation mode, at the moment, a standby power supply path formed by the bypass power output of the charging module, the battery pack and the DC/DC output power supply second channel is in a low power consumption mode, and the partial circuits play a role in stabilizing the output voltage of the UPS. When the ac input power of the power input port of the utility model is abnormal or off-supply, the output of the internal synchronous rectification module 3 will stop or the voltage will be abnormally low. At this time, the standby power supply formed by the battery pack module 5 and the DC/DC power supply second channel 7 in the UPS immediately enters the working mode, and the UPS also enters the UPS power supply mode for the loaded equipment, continuously replaces the synchronous rectification module 03 to supply power to the DC/DC output module 8, and regulates the voltage-stabilizing processing to 12VDC or 5VDC power output by the DC/DC output module 8.

The electric core group management module 6 can dynamically monitor the residual electric quantity of the electric core group module 5, correspondingly light an LED indicator lamp for display, and can send electric quantity information to embedded equipment loaded by the UPS through 2-bit SMBUS digital signals. The function can provide power failure early warning signals for loaded low-power embedded equipment. The function can provide a power-saving early warning signal for the loaded low-power embedded equipment 9, and is beneficial to the equipment to carry out important work such as data storage, communication termination preprocessing and the like in advance.

The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.

Claims (6)

1. A UPS for a low power embedded device, comprising: the device comprises a PFC module (1), an LLC resonance module (2), a synchronous rectification module (3), a charging management module (4), a cell group module (5), a cell group management module (6), a DC/DC power supply channel control module (7) and a DC/DC output module (8) which are sequentially connected, wherein the synchronous rectification module (3) and the charging management module (4) are both connected with the DC/DC power supply channel control module (7), the cell group management module (6) is also used for controlling and connecting a power supply channel between the charging management module (4) and the cell group module (5) and a power supply channel between the DC/DC power supply channel control module (7) and the cell group module (5);

the PFC module (1) is used for rectifying input alternating current into direct current and performing filtering, quasi-resonance boosting processing and AC input power factor boosting processing;

the LLC resonance module (2) is used for converting the DC current boosted by the PFC module (1) into a half-sine sequence waveform current through an MOSFET half bridge and transmitting the half-sine sequence waveform current to the synchronous rectification module (3);

the synchronous rectification module (3) is used for rectifying and stabilizing the half sine sequence waveform current generated by the step-down conversion of the secondary side winding of the transformer, and outputting the rectified current, wherein the output is divided into two paths: one path of output is output to the charging management module (4) and is used for charging the cell group module (5); the other path of the output is output to the DC/DC power supply channel control module (7) and is used as one of power supply inputs of the DC/DC output module (8);

the charging management module (4) charges the battery cell group module (5) according to the electric quantity saturation of the battery cell group module (5) and the channel control state of the battery cell group management module (6);

the battery pack management module (6) controls the on-off of a charging and discharging channel MOSFET according to the voltage and the current of the battery cells in the battery pack module (5) and the over-protection state of components in a module circuit;

the DC/DC power supply channel control module (7) is used for automatically selecting one path among the bypass power supply output of the cell group module (5) and the charging management module (4) and the output of the synchronous rectification module (3) to provide an input power supply for the DC/DC output module (8);

the DC/DC output module (8) is used for outputting the current at the input end of the module to the low-power embedded equipment (9) after DC/DC regulation and voltage stabilization treatment according to the set output voltage.

2. The UPS for a low power embedded device of claim 1, wherein: the PFC module (1) comprises a bridge rectifier circuit (11) and a PFC correction resonant circuit (12) which are connected, the bridge rectifier circuit (11) rectifies input alternating current into direct current and carries out filtering processing, and the PFC correction resonant circuit (12) carries out quasi-resonance boosting processing and power factor correction on the rectified and filtered direct current.

3. The UPS for a low power embedded device according to claim 1 or 2, wherein: the battery pack management module (6) is also used for monitoring the electric quantity inside the battery pack module (5) and outputting electric quantity information to the low-power embedded equipment (9).

4. The UPS for a low power embedded device of claim 1, wherein: the LLC resonance module (2) comprises a transformer coil winding, and the LLC resonance module (2) transmits the power of half-sine sequence waveform current to the synchronous rectification module (3) through the transformer coil winding.

5. The UPS for a low power embedded device of claim 1, wherein: the UPS panel is provided with an electric quantity indicating lamp, an SMBUS interface and an output voltage selection key, so that the set value of the output voltage can be switched between 12V and 5V.

6. The UPS for a low power embedded device of claim 1, wherein: the voltage of the input alternating current power supply is in the range of 100V-240V, and the frequency is 50Hz or 60 Hz.

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