CN201266840Y - DC power supply manager, power supply translation circuit and battery bag - Google Patents

DC power supply manager, power supply translation circuit and battery bag Download PDF

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Publication number
CN201266840Y
CN201266840Y CNU2008200948983U CN200820094898U CN201266840Y CN 201266840 Y CN201266840 Y CN 201266840Y CN U2008200948983 U CNU2008200948983 U CN U2008200948983U CN 200820094898 U CN200820094898 U CN 200820094898U CN 201266840 Y CN201266840 Y CN 201266840Y
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China
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power
output
voltage
power supply
signal
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CNU2008200948983U
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Chinese (zh)
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赵一飞
屈擘
高云飞
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BYD Co Ltd
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BYD Co Ltd
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Abstract

The utility model which is applied to the field of power management provides a DC power manager which comprises a protection unit, a connection unit and a DC-DC control unit; wherein, the protection unit detects the input-end voltage of the power and the output-end voltage of the power, outputs a corresponding protection and control signal and a chip internal circuit electrifying completion instruction signal, and protects the safety of a DC power manager; the connection unit is connected with the output end of the chip internal circuit electrifying completion instruction signal of the protection unit, generates and outputs an enabling signal according to the received chip internal circuit electrifying completion instruction signal which is output by the protection unit; and the DC-DC control unit is connected with the connection unit, controls the self-working state according to the received enabling signal which is output by the connection unit, detects the input-end voltage of the power, the output-end voltage of the power, and the returned and input current, regulates the input-end voltage of the power and the voltage ratio of the output-end voltage of the power, chooses the energy conversion direction according to the voltage ratio and carries out the energy conversion simultaneously, and outputs a voltage conversion control signal.

Description

A kind of DC power supply manager, power supply conversion circuit and power brick
Technical field
The utility model belongs to field of power management, relates in particular to a kind of DC power supply manager, power supply conversion circuit and power brick.
Background technology
Compare with lithium battery the most frequently used in the portable equipment, iron cell will have huge market potential with its long-life, high security, low cost.But at present a lot of portable equipments are also being continued to use the lithium battery power supply platform, iron cell to be squeezed into portable device market as early as possible, a kind of direct solution is to keep all power supply plans and the system of portable equipment originally, by some measures iron cell voltage is fitted to the output of lithium battery corresponding voltage, with the minimum voltage requirement and the lithium power consumption detection system of the original lithium battery power supply of compatibility system.
Because the lithium piezoelectric voltage is about 1.12 with the ratio of ferroelectric voltage, realize above-mentioned solution, need to consider from the following aspects: the one, be the original lithium electricity of compatibility electric power system minimum voltage, the inevitable requirement iron cell is by DC-to-DC (Direct Current-Direct Current, DC-DC) the change-over circuit discharge of boosting; The 2nd, the electric weight when discharging and recharging for the original lithium electricity of compatibility detects, the output that then requires DC-DC is not constant voltage, but follow rising and falling of ferroelectric voltage and the corresponding voltage value of the lithium electricity that coincide simultaneously, iron cell can only be selected to discharge by boost DC-DC thus, simultaneously by buck DC-DC charging, and to keep DC-DC both end voltage proportions constant at any time be 1.12; The 3rd, guarantee the fail safe of battery, prevent battery overcharge, overdischarge, overcurrent, short circuit and positive and negative high-voltage charging etc.
Existing power supply management integrated circuit (IC) products nearly all is to use independently electric weight release conversion module, charge management module and privacy protection circuit module respectively.And because the existing traditional DC-DC in current market be the constant voltage function, be inconvenient to realize that output voltage follows the input voltage variation, can only realize the constant voltage function.Be input now, fit to lithium electricity 3.7V constant voltage and be output as example that (IntegratedCircuit, technical solution IC) as shown in Figure 1 for existing integrated circuit with ferroelectric 3.3V.Prior art needs two to overlap independently DC-DC controller IC, be booster type PDM keyer IC BOOST, voltage-dropping type PDM keyer ICBUCK, the peripheral circuit of two cover DC-DC controllers, be the peripheral circuit (comprising inductance L 1, the inspection stream first resistance R s1, switching tube NMOS1 and PMOS1, output capacitance Cout1) of booster type PDM keyer IC BOOST, the peripheral circuit of voltage-dropping type PDM keyer IC BUCK (comprising inductance L 2, the inspection stream first resistance R s2, switching tube MMOS2 and PMOS2, output capacitance Cout2).Also need special-purpose power switch SWITCH to do the two-way gating, reserve battery protection IC PROTECTION, two switch MOS pipe NMOS3, NMOS4 that are used for defencive function, an oscillator IC OSC who guarantees whole system each several part clock synchronization.
Existing techniques in realizing get up the circuit structure complexity, area is big, cost is high, and is and higher to the control logic and the rate request of two-way gating switch, also will consider the sequential matching problem and the double loop stable problem of whole system simultaneously, realistic meaning is little.
The utility model content
The purpose of this utility model is to provide a kind of Novel DC power supervisor, is intended to solve have now the iron cell charge-discharge characteristic is fitted to the realization circuit structure complexity of charging and discharging lithium battery characteristic, the problem that cost is high.
The utility model is achieved in that a kind of DC power supply manager, and described DC power supply manager comprises:
Detect power input voltage, power output end voltage, circuit powers on and finishes index signal in output corresponding protection control signal and the chip, protection DC power supply manager inherently safe protected location;
Power on circuit in the described protected location chip and to finish the index signal output and be connected, power on according to circuit in the chip of the described protected location output that receives and finish the linkage unit that index signal generates enable signal and output; And
Be connected with described linkage unit, enable signal control self operating state according to the described linkage unit output that receives, detect the electric current of power input voltage, power output end voltage, feedback input, regulate power input voltage, power output end voltage ratio, select the power conversion direction and carry out power conversion according to voltage ratio, output voltage transforms the DC-DC control unit of control signal.
Another purpose of the present utility model is to provide a kind of power supply conversion circuit, and described power supply conversion circuit comprises:
The DC power supply manager;
Be connected with described DC power supply manager, transform the voltage conversion circuit that control signal is boosted power input voltage or step-down is changed according to the voltage that receives; And
Be connected with described DC power supply manager, according to the protective circuit of the protection control signal control power supply discharge that receives;
Described DC power supply manager comprises:
Detect power input voltage, power output end voltage, circuit powers on and finishes index signal in output corresponding protection control signal and the chip, protection DC power supply manager inherently safe protected location;
Power on circuit in the described protected location chip and to finish the index signal output and be connected, power on according to circuit in the chip of the described protected location output that receives and finish the linkage unit that index signal generates enable signal and output; And
Be connected with described linkage unit, enable signal control self operating state according to the described linkage unit output that receives, detect the electric current of power input voltage, power output end voltage, feedback input, regulate power input voltage, power output end voltage ratio, select the power conversion direction and carry out power conversion according to voltage ratio, output voltage transforms the DC-DC control unit of control signal.
Another purpose of the present utility model is to provide the power brick that includes above-mentioned power supply conversion circuit
In the utility model; the DC-DC control unit and the protected location that are common to the voltage stabilizing purposes are integrated in the chip; constitute a kind of DC power supply manager with defencive function, bi-directional DC-DC control, circuit structure is simple, cost is low, have perfect defencive function.Adopt this DC power supply manager, only can realize the energy bi-directional and keep the both end voltage ratio all the time, be applicable to that the voltage transitions with a kind of power supply A is the circuit of the voltage of another kind of power supply B with a small amount of peripheral component.
Description of drawings
Fig. 1 is the realization circuit structure diagram that iron cell voltage is fitted to lithium battery voltage that prior art provides;
Fig. 2 is the structure principle chart of the power brick that provides of the utility model embodiment;
Fig. 3 is the structure principle chart of the power supply conversion circuit that provides of the utility model embodiment;
Fig. 4 is the circuit diagram of the power supply conversion circuit that provides of the utility model embodiment;
Fig. 5 is the structure principle chart of the DC power supply manager that provides of the utility model embodiment;
Fig. 6 is the circuit diagram of the DC power supply manager that provides of the utility model embodiment;
Fig. 7 is the circuit diagram of the protected location that provides of the utility model embodiment;
Fig. 8 is the structure principle chart of the DC-DC control unit that provides of the utility model embodiment;
Fig. 9 is the circuit diagram of the DC-DC control unit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment is by being integrated in bi-directional DC-DC control unit and protected location in the chip; realized a kind of DC power supply manager with defencive function, bi-directional DC-DC control, circuit structure is simple, cost is low, have perfect defencive function.
Fig. 2 shows the structure of the power brick that the utility model embodiment provides, this power brick fits to the output of lithium battery corresponding voltage with iron cell voltage, minimum voltage with the original lithium battery power supply of compatibility system requires and lithium power consumption detection system, can be used to use the equipment of lithium battery power supply.Iron cell 201 is the power supply in the power brick.Power supply conversion circuit 202 fits to lithium battery output with iron cell 201, and protection iron cell 201 and inherently safe.
Fig. 3 shows the utility model embodiment power supply conversion circuit structure is provided.For convenience of explanation, only show the part relevant with the utility model.
DC power supply manager 301 is according to the electric current of detected power input voltage, power output end voltage, feedback input, and formation voltage transforms control signal, protection control signal and output.
Voltage conversion circuit 302 is connected with described DC power supply manager 301, electric power output voltage is boosted or the step-down conversion according to the voltage conversion control signal that receives.
Protective circuit 303 is connected with described DC power supply manager 301, according to the protection control signal control power supply discharge that receives.
The circuit structure of the power supply conversion circuit that the utility model embodiment provides for convenience of explanation, only shows the part relevant with the utility model embodiment as shown in Figure 4.
Voltage conversion circuit 302 comprises the first resistance R s, inductance L, the first switching tube Pmos1, second switch pipe Nmos1.The anodal B+ of power input is connected with second switch pipe Nmos1 one end with the first switching tube Pmos1 respectively through the first resistance R s, inductance L; Releasing of DC power supply manager 301 can be connected with the grid of the first switching tube Pmos1 by control end P_drv, controls the first switching tube Pmos1 break-make; The energy storage control end N_drv of DC power supply manager 301 is connected with the grid of second switch pipe Nmos1, control second switch pipe Nmos1 break-make; The other end of the first switching tube Pmos1 is connected with the anodal P+ of power output end; The other end of second switch pipe Nmos1 and power input negative pole B-be connected.
Protective circuit 303 comprises the 3rd switching tube Nmos2, the 4th switching tube Nmos3 and the 3rd resistance R 2.The mistake of DC power supply manager 301 is put control end DO and is connected with the 3rd switching tube Nmos2 grid, controls the 3rd switching tube Nmos2 break-make; The control end CO that overcharges of DC power supply manager 301 is connected with the 4th switching tube Nmos3 grid, controls the 4th switching tube Nmos3 break-make; Power input negative pole B-is connected with the 3rd switching tube Nmos2 one end; The 4th switching tube Nmos3 one end is connected with power output end negative pole P-; The 4th switching tube Nmos3 other end is connected with the 3rd switching tube Nmos2 other end; The reference voltage end VM of DC power supply manager 301 is connected with power output end negative pole P-through the 3rd resistance R 2.
Fig. 5 shows the structural principle of the DC power supply manager 301 that the utility model embodiment provides, and for convenience of description, only shows the part relevant with the utility model embodiment.
Protected location 501 detects power input voltage, power output end voltage; circuit powers on and finishes index signal in output corresponding protection control signal and the chip; protection DC power supply manager 301 inherently safes are to avoid when DC power supply manager 301 is in the non-normal working environment or manual operation causes under the situation improperly the damage even the generation of peril.For example DC power supply manager 301 self is carried out overvoltage protection, improper charge protection, overcurrent protection, short-circuit protection etc.The protection control signal is overcurrent protection control signal, short-circuit protection control signal, overvoltage protection control signal or unusual charge protection control signal etc.
Circuit powers on and finishes index signal in the chip of linkage unit 502 reception protected locations 501 outputs, and generation enables control signal and exports.
DC-DC control unit 503 is according to enable signal control self operating state of linkage unit 502 outputs that receive, detect the electric current of power input voltage, power output end voltage, feedback input, regulate power input voltage, power output end voltage ratio, select the power conversion direction and carry out power conversion according to voltage ratio, output voltage transforms control signal.
For reducing the IC area, reduce the IC cost, the power tube drive part of DC power supply manager 301 inside only adopts the 5V low pressure process.
The circuit structure of the DC power supply manager 301 that the utility model embodiment provides as shown in Figure 6, linkage unit 502 can for door.The mistake of protected location 501 is put indication end OD output high level, and circuit powers on and finishes index signal in the indication end EN1 pio chip that powers on.The mistake of protected location 501 puts indication end OD, the indication end EN1 that powers on is connected with input with door 502 respectively.Be connected with the input EN2 that enables of DC-DC control unit 503 with the control signal output ends that enables of door 502.The power input VB of DC-DC control unit 503 is connected with the power input VB of protected location 501; The power output end VP of DC-DC control unit 503 is connected with the power output end VP of protected location 501.Circuit has been finished and has been powered in DC power supply manager 301; and protected location 501 recovers to remove the state of putting; then cross and put indication end OD end and the indication end EN1 end output high level that powers on, enable input EN2 and hold input high level thereupon, DC-DC control unit 503 is started working.
Fig. 7 shows the circuit structure of the protected location that the utility model embodiment provides.The clock signal of delay circuit reception oscillator output generates signal Tvdet1 time of delay, Vdet2 and exports logical circuit to.Input voltage detector 5011 detects the voltage Vb of power input VB, and suitably exports required branch pressure voltage after the dividing potential drop.Output voltage detector 5012 detects the voltage Vp of power output end VP, and suitably exports required branch pressure voltage after the dividing potential drop.
Overcurrent protection: overcurrent comparator one termination reference voltage end VM, the other end receives the reference voltage verf that the internal reference potential circuit produces.In the discharge process, along with load current increases, the voltage difference between reference voltage end VM and the protective circuit ground end VSSB is followed the discharging current rising and is increased.In case the voltage difference between reference voltage end VM and the protective circuit ground end VSSB is greater than discharge overcurrent threshold value Vdet3; the overcurrent comparator will send signal to logical circuit; if the duration surpasses overcurrent delay time Tvdet3, logical circuit control that to put control end DO jumping be low level.After over-current state was replied, when promptly reference voltage end VM voltage was less than Vdet3, the overcurrent comparator sent the logical circuit that controls signal to of removing overcurrent protection, and logical circuit was controlled and put control end DO and be reset to high level again.
Short-circuit protection: the short-circuit voltage converting unit of input voltage detector 5011 detects the voltage Vb of power input VB and suitably sends into after the dividing potential drop end of short circuit comparator, and the short-circuit voltage converting unit of output voltage detector 5012 detects the voltage Vp of power output end VP and suitably send into after the dividing potential drop other end of short circuit comparator.Be each device of reliably protecting system; in case the voltage Vp of power output end VP is lower than the voltage Vb of 0.9 times power input VB; the short circuit comparator will send signal to logical circuit; if the duration surpasses short-circuit protection delay time Tshort, logical circuit controlled that to put control end DO be low level with redirect.If the voltage Vp of power output end VP is returned to the voltage Vb that is higher than 0.9 times of power input VB, the short circuit comparator sends the control signal of removing short-circuit protection, and then short-circuit condition is eliminated, and logical circuit was controlled and put control end DO and be reset to high level.
Overvoltage protection: the overvoltage voltage conversion unit of input voltage detector 5011 detects the voltage Vb of power input VB and suitably sends into after the dividing potential drop end of overvoltage comparator, and the overvoltage voltage conversion unit of output voltage detector 5012 detects the voltage Vp of power output end VP and suitably send into after the dividing potential drop other end of overvoltage comparator.In case the ratio of the voltage Vp of power output end VP and the voltage Vb of power input VB is higher than certain value, for example 1.28, then overvoltage comparator will send signal to logical circuit, and logical circuit control zero propagation will overcharge control end CO and be changed to low level.After overvoltage condition is replied; the ratio of voltage Vb that is the voltage Vp of power output end VP and power input VB is less than 1.28; overvoltage comparator sends the logical circuit that controls signal to of removing overvoltage protection, and logical circuit control overcharges control end CO and is reset to high level.
Unusual charge protection: the abnormal voltage converting unit of output voltage detector 5012 detects the voltage Vp of power output end VP and suitably sends into after the dividing potential drop end of unusual charging comparator, the ground VSSB of another termination internal circuit of this comparator.If when battery was in the reverse polarity charging state, the voltage of power output end VP was less than 0V, then reverse polarity charging comparator NV will send signal to logical circuit, and logical circuit control zero propagation is put control end DO with mistake and is changed to low level.
Further; can protect battery battery core safety when making power supervisor be used for that battery carried out voltage management; the protected location 501 that the utility model embodiment provides also comprises: the overcharged voltage converting unit of input voltage detector 5011, overcharge comparator, the overdischarge of input voltage detector 5011 is pressed converting unit, is crossed and put comparator.Put when protection when protection protected location 501 enters, and crossed and put indication end OD end and be output as low level, and enabled input EN2 input and be low level thereupon, thereby DC-DC control unit 503 is quit work.The control signal of protected location 501 outputs also comprises the over-charge protective control signal, crosses and put the protection control signal.
Over-charge protective: the overcharged voltage converting unit of input voltage detector 5011 detects the voltage Vb of power input VB and suitably sends into an end that overcharges comparator after the dividing potential drop, and this other end that overcharges comparator receives the reference voltage verf that internal reference potential circuit produces.During charging overcharges; when the voltage Vb of power input VB charging surpasses over-charge protective threshold value Vdet1; for example be made as 3.85V; overcharge comparator and will send signal to logical circuit; behind one section overvoltage protection Tvdet1 time of delay, it will be low level by the high level saltus step that logical circuit control overcharges control end CO.
Over-charge protective is replied: when the voltage of power input VB begins to be lower than over-charge protective return voltage Vrel1; overcharge comparator and will send signal to logical circuit; if the retention time long enough is replied Tvrel1 time of delay so that surpass over-charge protective; the over-charge protective state will be disengaged, and what this moment, logical circuit control overcharged control end CO is high level by the low level redirect.
Cross and put protection: the overdischarge of input voltage detector 5011 is pressed converting unit that the voltage Vb of power input VB is detected and was suitably sent into an end of putting comparator after the dividing potential drop, and this is crossed the other end of putting comparator and receives the reference voltage verf that the internal reference potential circuit produces.In the discharge process; when the voltage Vb of power input VB was lower than when putting protection threshold voltage Vdet2; cross and put comparator and will send signal to logical circuit, put guard delay time T vdet2 through one section mistake after, logical circuit was controlled and is put control end DO and change low level into.
Cross and put protection and reply: when battery was in when putting state; if there is charger to charge the battery; the voltage Vb of power input VB is gone back up to when exceeding Vdet2; cross and put comparator and will send signal to logical circuit; if the retention time long enough was put protection answer Tvrel1 time of delay down to surpassing; cross and put guard mode and will be disengaged, this moment logical circuit to control the output of putting control end DO be high level by the low level redirect.
Be low pressure 5V technology because chip internal connects a lot of circuit of power output end VP or P_VP, can not directly bear the voltage that is higher than 6V for a long time.For compatibility lies prostrate charge function to other high-voltage charging protections and realization to zero of electric core; the protected location 501 that the utility model embodiment provides also comprises overvoltage control end OV; the 0V voltage conversion unit of input voltage detector 5011 and the 0V voltage conversion unit of output voltage detector 5012, the comparator of releasing.Protected location 501 also possesses the defencive function of releasing and 0V charge function, and also output is released and protected control signal or 0V charging control signal.
The protection of releasing: the 0V voltage conversion unit of input voltage detector 5011 detects the voltage Vb of power input VB and suitably sends into after the dividing potential drop end of the comparator of releasing, and the 0V voltage conversion unit of output voltage detector 5012 detects the voltage Vp of power output end VP and suitably send into after the dividing potential drop other end of the comparator of releasing.When the voltage difference of the voltage Vb of the voltage Vp of power output end VP and power input VB takes place during greater than set point, for example when iron cell is fitted to lithium battery, when the voltage difference of the voltage Vb of the voltage Vp of power output end VP and power input VB during greater than 2.5V, the comparator of releasing this moment will send signal to logical circuit, and the control of zero propagation logical circuit is changed to low level with overvoltage control end OV.When the voltage difference of the voltage Vb of the voltage Vp of power output end VP and power input VB during less than 1V, logical circuit control overvoltage control end OV will reply and be high level.
0V charging: this function is applied to battery self-discharge and crosses to electric core and put the protection value when following, and promptly the voltage Vb of power input VB was lower than the value of putting, and DC-DC control unit 503 parts quit work, but still need at this moment electric core is charged.Logical circuit control overvoltage control end OV is changed to low level.Put the protection reverting value when the voltage Vb of power input VB constantly raises up to being higher than, DC-DC control unit 503 parts are started working, and logical circuit control overvoltage control end OV is changed to high level.
Above-mentioned input voltage detector 5011 and output voltage detector 5012 can adopt resistance to realize dividing potential drop.
In the utility model embodiment, DC-DC control unit 503 is that (its structural principle as shown in Figure 8 for Pulse WidthModu1ation, PWM) buck DC-DC control unit for bi-directional pulse width modulation.DC-DC control unit 503 comprises signal processing component 5031, pulse-width modulation assembly 5032 and control assembly 5033.
Signal processing component 5031 generates electric current comparison signal, direction instruction signal, reverse current comparison signal, and exports to pulse-width modulation assembly 5032 according to the electric current of power input voltage, power output end voltage and feedback input.
Control assembly 5033 receives the auxiliary control signals that enable control signal, 5032 outputs of pulse-width modulation assembly with door 502 outputs, generates 5032 beginnings of control pulse-width modulation assembly, operation control signal and output out of service according to enabling control signal, auxiliary control signal.
Pulse-width modulation assembly 5032 is according to the operation control signal control that receives control assembly 5033 outputs self operating state, and to control assembly 5033 output auxiliary control signals, electric current comparison signal, direction instruction signal, the reverse current comparison signal of 5031 outputs of received signal processing components generate pulse-width control signal and output.
The circuit of the DC-DC control unit that the utility model embodiment provides as shown in Figure 9.
Below represent that with Vb voltage difference between power input VB and the ground end VSSA, Vp represent that power output end VP and ground holds the voltage difference between the VSSA.
Enabling input EN2 is high level, allows two-way PWM buck DC-DC control unit 503 work.When the control power supply carried out boost conversion, the operation principle of DC-DC control unit 503 was as follows:
1) error amplifier compares and enlarges the detection signal of power output end VP and power input VB in real time, and this error amplification signal is delivered to electric current device is set;
2) voltage difference Vb between current detector detection comparison power input VB and the ground end VSSA and the signal of current detecting end I_Sense, the electric current of current detecting end Isense is enlarged into voltage signal, here be appointed as I_snl, current detector generates the resting potential signal of one road current signal simultaneously, the current potential of I_snl when its potential value equals Vb and equates with I_Sense, electric current on the corresponding first resistance R S is zero at this moment, here specifying this resting potential signal is V_qus, it is I_snl-V_qus=A (I_Sense-Vb) that the amplification pass is set, and wherein A is current sense amplifier gain (amplifies relation here and also can be made as I_snl-V_qus=-A (I_Sense-Vb) by changing difference amplification positive-negative input end);
3) electric current is provided with device and generates one tunnel current peak signal I_peak0 according to the error amplification signal of error amplifier output, and under the discharge mode that boosts, this peak signal is lower than V_qus;
4) the direction comparator compares V_pus and I_peak0, relatively gets I_peak0 and be lower than V_qus under boost mode, generates direction selection signal dir_sle, and it is that high level then is designated as pressure-increasning state that dir_sle is set here, and low level is designated as the step-down state;
5) clock signal of oscillator generation exports first slope compensation circuit to, first slope compensation circuit produces a slope compensation signal slope1 who is synchronized with this clock signal, the waveform of slope compensation signal slope1 is that zigzag and slope rise, I_peak0 is by stack slope compensation signal slope1, generate be used for current ratio under the boost mode peak signal I_peak1 and deliver to the two-way gate;
6) the two-way gate is controlled by direction selection signal dir_sle, two-way gate gating I_peak1 under boost mode, and specifying gating signal I_peak is I_peak1;
7) I_peak and I_snl deliver to two inputs of current comparator respectively, current comparator is the differential comparator of voltage input, I_snl is set delivers to positive input, I_peak delivers to negative input, then under boost mode when I_snl is low to moderate the I_peak current potential, comparison signal I_comp upset is low level;
8) simultaneously, Vb and I_Sense signal are also delivered to the reverse current comparator, and relatively the current potential of I_Sense and Vb is provided with I_Sense and delivers to positive input, and Vb delivers to negative input, generate comparison signal I_rcmp;
9) electric current comparison signal I_comp, direction instruction signal dir_sle and reverse current comparison signal I_rcmp together deliver to the PWM logic controller, oscillator is to PWM logic controller clock signal CLK, by this module export respectively release can control signal P_con, energy storage control signal N_con, concrete logic control operating process is: each CLK rising edge, N_con is high by low upset, inductance L is carried out energy storage, when I_comp is that N_con overturns to low when hanging down by high tumble, P_con is low by high tumble simultaneously, afterwards when I_rcmp signal when being high by low upset, P_con upset is for high, inductance L release can, if not upset of I_rcmp before CLK clock next time, then be height up to CLK rising edge P_con upset next time, N_con overturns thereupon and is height afterwards, enters the clock cycle next time, and circulation repeatedly;
10) N_con and P_con signal are delivered to first driver and second driver respectively, generate pulse-width control signal, in the utility model embodiment, and can switching signal P_drv and energy storage switching signal N_drv for releasing.
In step-down when control,, each module operation principle of master control loop and pressure-increasning state are basic identical, only be some senses and positive and negative oppositely:
1) error amplifier compares and enlarges the detection signal of power output end VP and power input VB in real time, and this error amplification signal is delivered to electric current device is set;
2) current detector detects the difference of amplifying I_Sense and Vb, generates current signal I_snl;
3) electric current is provided with device and generates one tunnel current peak signal I_peak0 according to the error amplification signal of error amplifier output, and under the step-down discharge mode, this peak signal is higher than V_qus;
4) clock signal of oscillator generation exports first slope compensation circuit to, the second slope compensation circuit slope comp2 produces a slope compensation signal slope2 who is synchronized with this clock signal, the waveform of slope compensation signal slope2 is that zigzag and slope descend, I_peak0 is through stack slope compensation signal slope2, generate the current ratio that is used under the decompression mode peak signal I_peak2 and deliver to the two-way gate;
5) the two-way gate is controlled by direction selection signal dir_sle, gating I_peak2 under decompression mode, and specifying gating signal I_peak is I_peak2;
6) I_peak and I_snl deliver to current comparator and generate comparison signal I_comp;
7) simultaneously, Vb and I_Sense deliver to current comparator IRCMP, and relatively the current potential of I_Sense and Vb is provided with I_Sense and delivers to positive input, and Vb delivers to negative input, generate comparison signal I_rcmp;
8) electric current comparison signal I_comp, direction instruction signal dir_sle and reverse current comparison signal I_rcmp together deliver to the PWM logic controller, oscillator is to PWM logic controller clock signal CLK, by this module export respectively release can control signal P_con, energy storage control signal N_con, concrete logic control operating process is: each CLK rising edge, P_con is low by upset, inductance L is released can, when I_comp when being high by low upset the P_con upset be high, N_con is high by low upset simultaneously, afterwards when the I_rcmp signal by high tumble when low, N_con upset is for low, and inductance L is carried out energy storage, if not upset of I_rcmp before CLK clock next time, then arrived CLK rising edge N_con upset next time for low, P_con upset afterwards enters the clock cycle next time for low, and circulation repeatedly;
9) N_con and P_con signal are delivered to first driver and second driver respectively, generate to release energy switching signal P_drv and energy storage switching signal N_drv.
In sum, the two-way PWM buck DC-DC controller unit that the utility model embodiment provides can switch electric energy according to the electric current variation of power output end VP automatically and transform direction, can be constant by the voltage ratio of pulse width modulation controlled power output end VP and power input VB under the situation of two-way conversion.In addition, in the design of IC interior, the signal that the positive-negative input end of positive negative direction, high-low level, amplifier or the comparator of specified signal etc. comprises direction in the narration much can be made exchanging of positive and negative or height above, by logically oppositely finally still realizing detection relation and operation mentioned above.
Wherein, the innovative point of two-way PWM buck DC-DC control unit can be summarized as follows:
1) traditional DC-DC is the voltage stabilizing purposes, and the input termination in the same way of error amplifier one reference voltage, reverse input end connect the output voltage feedback, thereby make a certain multiple of output voltage stabilization in reference voltage.Different with the voltage stabilizing purposes of traditional DC-DC, two-way PWM buck DC-DC control unit during this use is novel is delivered to power input VB and power output end VP the input in the same way and the reverse input end of error amplifier respectively as feedback voltage in conjunction with divider resistance R3, R4 and R1, R2 separately, the voltage ratio of power input VB and power output end VP is set, thereby makes power output end VP and power input VB voltage ratio keep constant.
2) a kind of current detecting mode is a serial connection inspection leakage resistance between the anode of the lower electric energy input/output terminal of voltage and inductance, detects electric current by the pressure drop that detects resistance.Owing to can be the electric current that continues on the end of low voltage when electric energy transforms between two voltage, and be backlash current on the end of high voltage, two-way PWM buck DC-DC control unit among the utility model embodiment adopts above-mentioned current detecting mode to realize current detecting end Isense was detected in the whole operation cycle, also can take into account separately the ascending current of current detecting end Isense on both direction simultaneously.
3) be different from traditional DC-DC control unit and only the current detection signal amplitude amplified the way that does not embody the sense of current, the current potential of electric current amplifying signal when the two-way PWM buck DC-DC control unit in the utility model is at first simulated and generated current detecting end Isense electric current and be zero, reference potential as electric current amplification and peak value, the electric current amplifying signal is presented as the amplification that is higher than this reference potential or is lower than reference potential, also embodies current detecting end Isense sense of current and amplitude simultaneously.
4) be different from the peak signal of traditional DC-DC control unit only as the restriction of restriction to size of current, only allow the single sense of current, the current peak setting of the two-way PWM buck DC-DC control unit among the utility model embodiment is reference with above-mentioned reference potential, generation is higher than reference potential or is lower than the primary current peak signal of reference potential, can allow current detecting end Isense electric current to select positive and negative two kinds of directions according to status requirements, simultaneously in conjunction with the effect of reverse current comparator, both limit the size of current detecting end Isense current peak, also defined current detecting end Isense sense of current; Select index signal to indicate current circuit working state by the relatively generation direction of primary current peak signal and current signal reference potential for boosting or step-down; The peak signal that slope compensation signal under the current peak signal stack corresponding state compares as ultimate current through conduct behind the gating; Can control end P_drv, energy storage control end N_drv output release can switching signal P_drv, energy storage switching signal N_drv by releasing according to described logic behavior combination in the middle of the operating procedure before for clock signal, electric current comparison signal, reverse current comparison signal, direction selection signal.
Two-way PWM buck DC-DC control unit adopts the bi-directional pulse width modulation control principle, has taken into account ascending, descending and has pressed two kinds of electric energy transformation functions, discerns application need voluntarily and switches the buck pattern.Particularly, when the voltage Vp of power output end VP is higher or lower than the setting multiple of voltage Vb of power input VB, two-way PWM buck DC-DC control unit will enter automatically and boost or the step-down operating state, and for example when iron cell was fitted to lithium battery, the Vp/Vb ratio was 1.12.DC power supply manager 301 with the voltage Vp of the Vb of power input VB voltage and power output end VP in conjunction with dividing potential drop second resistance R 1, R2 and R3, R4 separately, deliver to the input in the same way and the reverse input end of error amplifier respectively as feedback voltage, the voltage ratio of Vb and Vp is set, makes Vp/Vb set multiple.
At the low power consumption high efficiency requirement that portable equipment is used, the two-way PWM buck DC-DC control unit 503 that the utility model embodiment provides enters battery saving mode when underload.When power output end VP load was light, DC power supply manager 301 alternation under pressure-increasning state entered battery saving mode between idle pulley and normal mode of operation.Under battery saving mode, have only oscillator and error comparator EA to keep operating state, all power down of other circuit modules.
Certainly, the first switching tube Pmos1 in the voltage conversion circuit 302, second switch pipe Nmos1 also can be integrated in the DC power supply manager 301.And, MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) (Metal-Oxide-Semiconductor Field-Effect Transistor such as Pmos wherein, Nmos, MOSFET) also can be field-effect transistor (Field-Effect Transistor, FET) or bipolar junction transistor (BipolarJunction Transistor, BJT).
Further, the power input VB of DC power supply manager 301 is connected with input positive source B+; Input voltage test side VT is connected with input positive source B+ through second resistance R 1; Power output end VP is connected with the anodal P+ of out-put supply, detects the voltage Vp of output; Circuit inspection stream end Isense is connected to any end of inductance L, detects the size of current on the inductance L, with by release can control end P_drv and energy storage control end N_drv control the on off state of the first switching tube Pmos1 and second switch pipe Nmos2; Over-charge protective input VP_CO is connected through the anodal P+ of the 4th resistance R 3 and out-put supply; Positive polarity voltage power supply port VP_P is connected with the anodal P+ of out-put supply; Reverse voltage power supply port VSSA_P, protected location negative pole VSSB and control unit negative pole VSSA are connected with power cathode B-.Input positive source B+ is connected with power cathode B-through input capacitance CIN.
Further, protective circuit 303 also comprises: diode D1 positive pole connects the 3rd switching tube Nmos2 source electrode, and negative pole connects the 3rd switching tube Nmos2 drain electrode; Diode D2 positive pole connects the 4th switching tube Nmos3 source electrode, and negative pole connects the 4th switching tube Nmos3 drain electrode.
Iron cell is fitted to lithium battery is example, and during discharge, iron cell is through the 1.12 times of discharges of boosting of power supply conversion circuit; During charging, fall 1.12 times to the iron cell charging through the power supply conversion circuit, thereby realize that the ferroelectric dot characteristics that charges and discharge is similar to the lithium electricity, and will protect iron cell safety.
When iron cell boosts discharge and step-down charging, energy control end P_drv released by DC power supply manager 301 and energy storage control end N_drv exports the PWM drive signal to the grid of the first switching tube Pmos1 and second switch pipe Nmos1 in real time, and then regulate the input and output electric current, reach the ratio balance and stability of power output end VP voltage and power input VB voltage.
During over-charge protective, DC power supply manager 301 overcharges control end CO and is output as low level, and the 4th switching tube Nmos3 turn-offs thereupon, cuts off the battery charge path, stops charging.
When over-charge protective was replied, DC power supply manager 301 overcharged control end CO and is output as high level, and the 4th switching tube Nmos3 opens thereupon, was communicated with the battery charge path, began charging.
Cross and put when protection, DC power supply manager 301 is crossed and is put control end DO output and change low level into, and the 3rd switching tube Nmos2 turn-offs thereupon, cuts off the battery discharge path, stops discharge.
Cross when putting the protection answer, put control end DO is output as high level to DC power supply manager 301 excessively, and the 3rd switching tube Nmos2 opens thereupon, is communicated with the battery discharge path.
During overcurrent protection, DC power supply manager 301 is crossed and put control end DO jumping is low level, and the 3rd switching tube Nmos2 turn-offs thereupon, cuts off the battery discharge path.After over-current state was replied, put control end DO was reset to high level to DC power supply manager 301 more excessively.The 3rd switching tube Nmos2 opens thereupon, is communicated with the battery discharge path.
During short-circuit protection, put control end DO is output as low level to DC power supply manager 301 excessively, and the 3rd switching tube Nmos2 turn-offs thereupon, cuts off the battery discharge path.After short-circuit condition was eliminated, put control end DO was reset to high level to DC power supply manager 301 excessively, and the 3rd switching tube Nmos2 opens thereupon, is communicated with the battery discharge path.
During overvoltage protection, DC power supply manager 301 overcharges control end CO and is changed to low level, and the 4th switching tube Nmos3 turn-offs thereupon, cuts off the battery charge path.After overvoltage condition was replied, DC power supply manager 301 overcharged control end CO and is reset to high level, and the 4th switching tube Nmos3 opens thereupon, was communicated with the battery charge path.
During unusual charge protection, DC power supply manager 301 is crossed and is put control end DO and be changed to low level, and the 3rd switching tube Nmos2 turn-offs thereupon, cuts off the battery discharge path.
Further, realize zero volt charge function for protection DC power supply manager 301 when positive or negative high voltage charges with to battery, the protective circuit 303 that the utility model embodiment provides also comprises the 5th switching tube Pmos2.DC power supply manager 301 overvoltage control end OV are connected with the 5th switching tube Pmos2 grid, and the anodal P+ of out-put supply is connected with the 5th switching tube Pmos2 source electrode, and input positive source B+ is connected with the 5th switching tube Pmos2 drain electrode.
When releasing protection, DC power supply manager 301 overvoltage control end OV are changed to low level, and the 5th switching tube Pmos2 opens thereupon, are communicated with power output end VP and power input VB, and this moment, electric current poured in power input VB from power output end VP rapidly.Avoid chip to cause because of output VP input voltage is too high damaging on the one hand, make iron cell can adapt to the non-standard charger that some output voltage is higher than 5V on the other hand.When the voltage difference of power output end VP voltage and power input VB voltage during less than 1V, DC power supply manager 301 overvoltage control end OV will be reset to high level, the 5th switching tube Pmos2 turn-offs thereupon, the direct connection relational of cut off the electricity supply output VP and power input VB.
During the 0V charging, the passive low level that is changed to of DC power supply manager 301 overvoltage control end OV meeting, the 5th switching tube Pmos2 conducting thereupon directly connects power output end VP and power input VB, and this moment, the 5th switching tube Pmos2 promptly can be used as charge tunnel.When constantly raising, power input VB voltage put the protection reverting value up to being higher than; DC-DC control unit 503 parts are started working; DC power supply manager 301 overvoltage control end OV are output as high level; the 5th switching tube Pmos2 turn-offs thereupon, and charger is given power input VB charging by DC-DC control unit 503 then.
In the power supply conversion circuit that the utility model embodiment provides, as shown in Figure 4, Rs is that 30m Ω, R1 are that 1k Ω, R2 are that 2.7k Ω, R3 are that 10k, L are that 2.2u, CIN are that 1uF, COUT are 47uF.
In the utility model embodiment, DC power supply manager 301 can adopt minitype paster QFN3*3_16L encapsulation.
The DC power supply manager that the utility model embodiment provides; bi-directional DC-DC control unit and protected location are integrated in the chip; constitute a kind of DC power supply manager with defencive function, bi-directional DC-DC control, circuit structure is simple, cost is low, have perfect defencive function.Adopt this DC power supply manager, only can realize the energy bi-directional and keep the both end voltage ratio all the time with a small amount of peripheral component, be applicable to that the voltage transitions with a kind of power supply A is the circuit of the voltage of another kind of power supply B, be specially adapted to the iron cell powered portable power devices system of compatible lithium electricity power supply.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims (8)

1, a kind of DC power supply manager is characterized in that, described DC power supply manager comprises:
Detect power input voltage, power output end voltage, circuit powers on and finishes index signal in output corresponding protection control signal and the chip, protection DC power supply manager inherently safe protected location;
Power on circuit in the described protected location chip and to finish the index signal output and be connected, power on according to circuit in the chip of the described protected location output that receives and finish the linkage unit that index signal generates enable signal and output; And
Be connected with described linkage unit, enable signal control self operating state according to the described linkage unit output that receives, detect the electric current of power input voltage, power output end voltage, feedback input, regulate power input voltage, power output end voltage ratio, select the power conversion direction and carry out power conversion according to voltage ratio, output voltage transforms the DC-DC control unit of control signal.
2, DC power supply manager as claimed in claim 1; it is characterized in that; described linkage unit is and door; described and input of door and the interior circuit of the chip of described protected location power on and finish the index signal output and be connected; another input termination high level, described and gate output terminal output enable controls signal to described DC-DC control unit.
3, DC power supply manager as claimed in claim 1 is characterized in that, described DC-DC control unit is the two-way PWM buck DC-DC control unit of output pulse width control signal.
4, DC power supply manager as claimed in claim 3 is characterized in that, described two-way PWM buck DC-DC control unit comprises:
According to the electric current of power input voltage, power output end voltage and feedback input, generate the signal processing component of comparison signal and output;
According to the operation control signal control that receives self operating state, and the output auxiliary control signal, receive the comparison signal that described signal processing component is exported, generate the pulse-width modulation assembly of pulse-width control signal and output; And
According to the auxiliary control signal that enables control signal, the output of described pulse-width modulation assembly of described linkage unit output output, generate the control assembly of described operation control signal and output.
5, a kind of power supply conversion circuit is characterized in that, described power supply conversion circuit comprises:
The DC power supply manager;
Be connected with described DC power supply manager, transform the voltage conversion circuit that control signal is boosted power input voltage or step-down is changed according to the voltage that receives; And
Be connected with described DC power supply manager, according to the protective circuit of the protection control signal control power supply discharge that receives;
Described DC power supply manager comprises:
Detect power input voltage, power output end voltage, circuit powers on and finishes index signal in output corresponding protection control signal and the chip, protection DC power supply manager inherently safe protected location;
Power on circuit in the described protected location chip and to finish the index signal output and be connected, power on according to circuit in the chip of the described protected location output that receives and finish the linkage unit that index signal generates enable signal and output; And
Be connected with described linkage unit, enable signal control self operating state according to the described linkage unit output that receives, detect the electric current of power input voltage, power output end voltage, feedback input, regulate power input voltage, power output end voltage ratio, select the power conversion direction and carry out power conversion according to voltage ratio, output voltage transforms the DC-DC control unit of control signal.
6, power supply conversion circuit as claimed in claim 5 is characterized in that, described voltage conversion circuit comprises:
First resistance, inductance, first switching tube and second switch pipe;
The described first switch controlled end is released and can be connected by control end with described DC power supply manager, and two main electric current break-over utmost points connect the power output end positive pole respectively, connect the power input positive pole through the described inductance and first resistance;
Described second switch pipe control end is connected with described DC power supply manager energy storage control end, and two main electric current break-over utmost points connect power supply input end negative pole respectively, connect the power input positive pole through the described inductance and first resistance.
7, power supply conversion circuit as claimed in claim 5 is characterized in that, described protective circuit comprises:
The 3rd switching tube, the 4th switching tube and the 3rd resistance;
Described the 3rd switch controlled end and described DC power supply manager are crossed and are put control end and be connected, and two main electric current break-over utmost points connect power supply input end negative pole respectively, connect the power output end negative pole through described the 4th switching tube;
Described the 4th switch controlled end overcharges control end with described DC power supply manager and is connected, and two main electric current break-over utmost points connect the power output end negative pole respectively, connect the power input negative pole through described the 3rd switching tube;
The described DC power supply manager of described the 3rd resistance one termination reference voltage end, another termination power output end negative pole.
8, a kind of power brick that includes the power supply conversion circuit is characterized in that, described power supply conversion circuit is the described power supply conversion circuit of claim 5.
CNU2008200948983U 2008-06-20 2008-06-20 DC power supply manager, power supply translation circuit and battery bag Expired - Fee Related CN201266840Y (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103457314A (en) * 2013-07-04 2013-12-18 深圳市金誉半导体有限公司 Control chip for charging and boosting discharging of switch-type single lithium battery
CN104319996A (en) * 2014-10-30 2015-01-28 武汉大学 Synchronous rectification step-down converter chip with high-precision current detection function
TWI482391B (en) * 2013-04-02 2015-04-21 Wistron Corp Charging circuit for electronic device and related charging method
CN106602854A (en) * 2015-10-20 2017-04-26 长沙广义变流技术有限公司 Bidirectional chopper
TWI580402B (en) * 2016-05-03 2017-05-01 Hiwin Tech Corp Physiological signal sensing device and its operation method of turning on and off
CN107348959A (en) * 2016-05-09 2017-11-17 上银科技股份有限公司 Physiological signal sensing device and its operation method of start and shutdown
CN109417204A (en) * 2016-06-30 2019-03-01 微软技术许可有限责任公司 Multiple groups and component connectivity detection
CN110910810A (en) * 2019-11-26 2020-03-24 Tcl华星光电技术有限公司 Power management chip and display device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI482391B (en) * 2013-04-02 2015-04-21 Wistron Corp Charging circuit for electronic device and related charging method
US9030171B2 (en) 2013-04-02 2015-05-12 Wistron Corporation Charging circuit for electronic device and related charging method
CN103457314A (en) * 2013-07-04 2013-12-18 深圳市金誉半导体有限公司 Control chip for charging and boosting discharging of switch-type single lithium battery
CN103457314B (en) * 2013-07-04 2016-12-28 深圳市金誉半导体有限公司 A kind of switching mode single lithium battery charging and step-up discharge control chip
CN104319996A (en) * 2014-10-30 2015-01-28 武汉大学 Synchronous rectification step-down converter chip with high-precision current detection function
CN106602854A (en) * 2015-10-20 2017-04-26 长沙广义变流技术有限公司 Bidirectional chopper
CN106602854B (en) * 2015-10-20 2019-07-16 长沙广义变流技术有限公司 A kind of two-way chopper
TWI580402B (en) * 2016-05-03 2017-05-01 Hiwin Tech Corp Physiological signal sensing device and its operation method of turning on and off
CN107348959A (en) * 2016-05-09 2017-11-17 上银科技股份有限公司 Physiological signal sensing device and its operation method of start and shutdown
CN107348959B (en) * 2016-05-09 2020-10-09 上银科技股份有限公司 Physiological signal sensing device and operation method for starting and stopping physiological signal sensing device
CN109417204A (en) * 2016-06-30 2019-03-01 微软技术许可有限责任公司 Multiple groups and component connectivity detection
CN109417204B (en) * 2016-06-30 2021-09-24 微软技术许可有限责任公司 Multi-group and component connectivity detection
CN110910810A (en) * 2019-11-26 2020-03-24 Tcl华星光电技术有限公司 Power management chip and display device

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