CN104868743A - Auxiliary power supply system for electric vehicle - Google Patents
Auxiliary power supply system for electric vehicle Download PDFInfo
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- CN104868743A CN104868743A CN201510334581.7A CN201510334581A CN104868743A CN 104868743 A CN104868743 A CN 104868743A CN 201510334581 A CN201510334581 A CN 201510334581A CN 104868743 A CN104868743 A CN 104868743A
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Abstract
The invention relates to an auxiliary power supply system for an electric vehicle, and belongs to the field of electronic technology. The auxiliary power supply system adopts the novel primary side feedback technology instead of the secondary side feedback technology widely applied in the prior art, adopts a digital compensation module to trace the voltage of a primary side auxiliary winding to obtain a relatively accurate feedback value, and adopts the quasi-resonant technology to further improve the efficiency and accuracy of the system. The auxiliary power supply system comprises a DC voltage source, an EMI filter, a switching convertor, the digital compensation module, a quasi-resonant circuit and a control chip. According to the auxiliary power supply system, the novel digital compensation module is additionally adopted to accurately acquire feedback data, while the traditional large-area digital-to-analog converters are eliminated; moreover, the quasi-resonant technology is adopted, so that the loss of the system is further reduced, and the cost is lower than that of the traditional auxiliary power supply system; the auxiliary power supply system provided by the invention further has several advantages, which do not belong to most of the traditional vehicle-mounted auxiliary power supply systems, such as high output accuracy, high operating efficiency, low impact of work environment, and small size, so that the power supply performance of the conventional vehicle-mounted power supplies on the market is improved effectively, and the cost is relatively low.
Description
Technical field
The invention belongs to electronic technology field, relate to
a kind of electric motor car secondary power system.
Background technology
Along with economic development and science and technology progress, save energy and protect environment pay attention to by various circles of society.Electric energy used for electric vehicle, as fuel, instead of traditional oil, realizes " zero discharge ", is the important means solving the energy and environmental problem
The linear accessory power supply of the many uses of current electric automobile, but in using and sum up in recent years, the problem existing for this supply power mode is also completely exposed gradually.Its major defect existed is as follows: 1) linear power supply efficiency comparison is low, usually only has 31.25%; 2) voltage range that linear power supply is applicable is limited, and when groups as many in needs export, then volume of transformer can increase many; 3) generally speaking cost compare is expensive for linear power supply.After technological improvement, some vehicle-mounted secondary power system starts to adopt switch power technology to be optimized.In traditional inverse-excitation type switch power-supply technology, mostly use optocoupler to realize output voltage feedback and electrical isolation.After using this technology to be optimized, tool has the following advantages compared with linear power supply: 1) Primary Component of Switching Power Supply inside is operated in HF switch state, the energy itself consumed is very low, and therefore in machine, temperature rise is also low, ensure that stability and the reliability of complete machine; 2) adaptive capacity of electrical network is also greatly improved, the change of line voltage in the scope of 110V ~ 260 can be adapted to; 3) when input and load variations, also more stable output can be obtained.But this method also also exists some problems itself, the current transfer ratio temperature influence of optocoupler is comparatively large, particularly when pair carry heating larger particularly evident, have a strong impact on output voltage precision.
In order to overcome above shortcoming, adopting former limit feedback technique to substitute the secondary side feedback that is made up of optocoupler and being carried out.This technology does not need optocoupler, directly assists winding up-sampling to be outputed signal from former limit or former limit, solves the problem that optocoupler brings, its main circuit as
accompanying drawing 3shown in.Although solve after adopting former limit feedback technique and overcome above shortcoming smoothly; but the switch being difficult to bear switching tube due to this method can introduce larger noise and high pressure; and usually can there is larger error, so service efficiency and the output accuracy of power-supply system can not be promoted well when sampling.
Summary of the invention
In view of this, the object of the present invention is to provide one
novelelectric motor car secondary power system, this system is mainly used in vehicle-mounted DC/DC and converts, and in the present system, adopts former limit feedback technique to replace secondary side feedback, thus eliminates the feedback arrangement of optocoupler and TL431 chip composition, save chip version
figurearea, reduces cost and effectively raises the reliability of system.
For achieving the above object, the invention provides following technical scheme:
a kind of electric motor car secondary power system, adopt former limit feedback technique to replace traditional secondary side feedback in the present system, described power-supply system comprises direct voltage source, electromagnetic interface filter, switch converters, current sampling current-limiting circuit, digital compensation modules, quasi-resonance circuit and control chip; Described switch converters is made up of a high voltage bearing power switch pipe, high frequency transformer and corresponding buffer loop; Described digital compensation modules formed primarily of voltage sample module, digital to analog converter, digital compensator, waveform real-time analysis module; Described quasi-resonance circuit formed primarily of metal-oxide-semiconductor, flyback transformer, input filter circuit, output rectification circuit and resonant capacitance, and wherein resonant capacitance comprises other stray capacitances in the output capacitance of switching tube, the distributed capacitance of transformer and circuit;
The grid of power switch pipe is connected with the output of control chip, and the PWM ripple exported by chip drives, and the source class of power switch pipe is connected with the former limit winding of high frequency transformer, and adds RC buffer circuit between the source class and drain electrode of power switch pipe; The secondary of high frequency transformer is output; Described secondary power system has multiple output, between each output mutually
independent; Assist on the former limit of high frequency transformer for D/A converter module between winding and control chip, by gathering the magnitude of voltage of assisting winding to obtain in former limit and following the trail of it, then send into digital comparator and change, realize accurate former limit sampling.
Further, described direct voltage source adopts Vehicular accumulator cell.
Further, just conducting time the metal-oxide-semiconductor in system remains at the lowest point, thus reduce switching tube conduction loss, reduce output diode reverse loss, the EMI of system can also be reduced simultaneously.
Beneficial effect of the present invention is: in system of the present invention, adopts
novelformer limit feedback technique, can assist winding up-sampling output voltage on former limit accurately, and does not need to rely on traditional large area long number weighted-voltage D/A converter; Simultaneously, quasi-resonance circuit is also added in main circuit after improvement, because this technology makes power supply under any output loading, any linear input voltage condition, by the delay switch turn-off time, switching tube drain source voltage is down to minimum, to ensure that it carries out switch motion with minimum drain voltage under critical conduction mode, reduces spine interference, reduce its loss, improve systematic function.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides as follows
accompanying drawingbe described:
fig. 1for the main circuit of system of the present invention is illustrated
figure;
fig. 2for the signal of traditional secondary side feedback electric power main circuit
figure;
fig. 3for traditional former limit fed power supplies main circuit signal
figure;
fig. 4for
novelthe fed power supplies main circuit signal of former limit
figure;
fig. 5for waveform analysis flow process
figure;
fig. 6for introducing
novelsystem frame after the feedback technique of former limit
figure.
Embodiment
Below in conjunction with
accompanying drawing, the preferred embodiments of the present invention are described in detail.
fig. 1for introducing
novelthe electric motor car secondary power system main circuit of former limit feedback technique, compared with the conventional linear power-supply system formed primarily of batteries, rectification circuit, filter circuit, voltage stabilizing circuit four part, the circuit of this power-supply system adopts former limit feedback technique to replace traditional secondary side feedback, and make technical innovation, can measure feedback voltage level more accurately, the high efficiency realizing power supply uses.
fig. 2for the signal of traditional secondary side feedback electric power main circuit
figure, in traditional secondary side feedback technology, usually energy just can have been passed to the time point of secondary as fixed sample point from former limit, assist winding to sample to obtain output voltage signal in this moment to former limit.Because now secondary current is larger, larger pressure drop is had between coil and output, so the feedback voltage sampled and actual output voltage have larger error, in order to address this problem, introduce a kind of former limit feedback technique of novelty in a power, under the prerequisite not adopting large area digital to analog converter, precisely the feedback voltage on winding is assisted on the former limit of collection, realizes precisely controlling.
fig. 3for traditional former limit fed power supplies main circuit signal
figure.
fig. 6for introducing
novelsystem frame after the feedback technique of former limit
figure, add
novelits running of electric motor car secondary power system of former limit feedback technique is as follows: when after start up system, direct voltage source starts electric discharge, namely storage battery starts electric discharge, and after EMI filter circuit and input filter, send into power switch pipe, whole power-supply system is operated in discontinuous conduct mode.When pulse-width signal high level, switching tube conducting, former limit has electric current to flow through, and energy storage is in former avris.During low level, switching tube turns off, and according to electromagnetic induction principle, can produce induced voltage in the secondary side of anti exciting converter, secondary conducting is exported.Meanwhile, after switching tube cut-off, drain electrode can produce one caused by transformer leakage inductance and capacitor resonance, afterwards switching tube drain electrode convergence stationary value.After certain hour, the energy of the former avris of anti exciting converter is entirely delivered to secondary, flows through to export the electric current of rectifier diode and be reduced to zero, this diode reverse by.Now, by former limit inductance, former limit inductance equivalent resistance, the RLC resonant circuit that electric capacity is formed starts concussion, and in switching tube drain electrode generation resonance potential, raising the efficiency to reduce switching loss, switching tube must be allowed to open at voltage lowest part, so just can draw the resonance time parameter needed for quasi-resonance circuit.
fig. 4for
novelthe fed power supplies main circuit signal of former limit
figure, the main implementation procedure of novelty former limit feedback technique proposed in electric motor car secondary power system of the present invention is as follows: the sampling of output voltage is by former limit auxiliary winding voltage V
ssampling realize, the major function of controller former limit sample circuit accurately detects voltage and carries out digital-to-analogue conversion to it, produces a digital feedback quantity V
f.The mode that compensator in control chip have employed digital compensation realizes, and digital compensator is according to digital feedback amount V
fcalculate the duty ratio that current period needs, and the pwm pulse exporting corresponding duty ratio remove control switch pipe open shutoff, finally realize the modulation of output voltage.When switching tube turns off, be stored in the energy trasfer of former avris to secondary side, output diode conducting, secondary current drops to zero after rising to peak value.At this stage, output voltage can be assisted on winding to former limit by transformer coupled, and suitable sampled point will be selected here to obtain feedback voltage accurately.Same digital input amount can be converted to the analog voltage that two-way has consistent difference Δ V by the digital to analog converter of single-input double-output, respectively as the reverse benchmark of two comparators, then with the V that obtains of sampling
scompare and obtain V
p1and V
p2, these two data draw whether be suitable sampled point, just make corresponding adjustment if improper by analysis with after judgement by waveform analysis module.After PWM is zero level, V
shigh voltage is become, V from negative voltage
p2and V
p1be turned to high level, afterwards along with V
sdecline gradually, V
p2first can be turned to zero level, V after the Δ t time
p1just be turned to low level.At precise sample point T
klater V
salter a great deal, therefore at V
son diverse location record Δ t that feedback voltage produces can difference very large.As
accompanying drawing 5shown in, select a suitable Δ tref and Δ V, make when Δ t equals Δ tref, V
fbe just reacted required sampled voltage, can realize like this automatic tracing of voltage and realize accurate former limit sampling.
fig. 5for waveform analysis flow process
figure.
Specifically,
as Fig. 1shown in, the main circuit of system comprises direct voltage source 101, power switch pipe 102, power tube drive singal 103, high frequency transformer 104, voltage sample module 105, output diode 106, digital to analog converter 107, master control chip 108, digital compensator 109, wherein power switch pipe 102 and high frequency transformer 104 constitute switch converters.The metal-oxide-semiconductor that power switch pipe 102 generally selects withstand voltage enough, enough abundant value is stayed to prevent switching tube operationally breakdown, it is characterized in that the grid of power switch pipe 102 is connected with the output of master control chip 108, the PWM ripple exported by chip drives, the source class of power switch pipe 102 is connected with the former limit winding of high frequency transformer 104, and adds RC buffer circuit between the source class and drain electrode of power switch pipe 102.The secondary of high frequency transformer 104 is output, and secondary power system of the present invention has multiple output, between each output mutually
independent.Assist on the former limit of high frequency transformer 104 between winding and master control chip 108 is digital-to-analogue conversion compensating module, by gathering the magnitude of voltage of assisting winding to obtain in former limit and following the trail of it, then send into digital comparator to change, realize accurate former limit sampling, it is made up of voltage sample module 105, digital to analog converter 107, digital compensator 109, waveform analysis module 110.
Former limit feedback technique is adopted to replace traditional secondary side feedback in native system, its advantage does not adopt optocoupler to carry out isolation feedback, directly assist on former limit and winding carries out sampling obtain output voltage signal, avoid larger etc. the problem of temperature influence that traditional secondary side feedback brings, reduce system bulk, reduce the interference of outer bound pair system; And add digital compensation modules and two close cycles regulable control.Digital to analog converter 107 and waveform real-time analysis module 109 is added in voltage sample process, compared with traditional former limit FEEDBACK CONTROL, the advantage brought so better controls feedback error, and the zero pole point that digital compensation provides is not completely by the impact of manufacture craft or temperature characterisitic, comparing conventional method can provide and compensate more accurately.
In addition, introduce quasi-resonance technology in native system, its advantage is the operating frequency that can change power supply, no matter instant input voltage or secondary carrying are how many, how to change, time metal-oxide-semiconductor remains at the lowest point, just conducting, by this technology, reduces switching tube conduction loss, reduce output diode reverse loss, the EMI of system can also be reduced simultaneously, just reduce the use amount of system EMI filter, accomplish the lifting to performance while cost-saving.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (3)
1. an electric motor car secondary power system, it is characterized in that: adopt former limit feedback technique to replace traditional secondary side feedback in the present system, described power-supply system comprises the direct voltage source, electromagnetic interface filter, switch converters, current sampling current-limiting circuit, digital compensation modules, quasi-resonance circuit and the control chip that connect successively; Described switch converters is made up of a high voltage bearing power switch pipe, high frequency transformer and corresponding buffer loop; Described digital compensation modules formed primarily of voltage sample module, digital to analog converter, digital compensator, waveform real-time analysis module; Described quasi-resonance circuit formed primarily of metal-oxide-semiconductor, flyback transformer, input filter circuit, output rectification circuit and resonant capacitance, and wherein resonant capacitance comprises other stray capacitances in the output capacitance of switching tube, the distributed capacitance of transformer and circuit;
The grid of power switch pipe is connected with the output of control chip, and the PWM ripple exported by chip drives, and the source class of power switch pipe is connected with the former limit winding of high frequency transformer, and adds RC buffer circuit between the source class and drain electrode of power switch pipe; The secondary of high frequency transformer is output; Described secondary power system has multiple output, separate between each output; Assist on the former limit of high frequency transformer for D/A converter module between winding and control chip, by gathering the magnitude of voltage of assisting winding to obtain in former limit and following the trail of it, then send into digital comparator and change, realize accurate former limit sampling.
2. a kind of electric motor car secondary power system according to claim 1, is characterized in that: described direct voltage source adopts Vehicular accumulator cell.
3. a kind of electric motor car secondary power system according to claim 1, it is characterized in that: just conducting time the metal-oxide-semiconductor in system remains at the lowest point, thus reduce switching tube conduction loss, reduce output diode reverse loss, the EMI of system can also be reduced simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334581.7A CN104868743A (en) | 2015-06-16 | 2015-06-16 | Auxiliary power supply system for electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334581.7A CN104868743A (en) | 2015-06-16 | 2015-06-16 | Auxiliary power supply system for electric vehicle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785874A (en) * | 2016-08-30 | 2018-03-09 | 南京中兴新软件有限责任公司 | Power protection method, apparatus and circuit |
| CN108494262A (en) * | 2018-04-20 | 2018-09-04 | 丰县宏祥电子科技有限公司 | The special full isolation DC-DC converter of New-energy electric vehicle |
| CN109149947A (en) * | 2018-09-29 | 2019-01-04 | 北京机械设备研究所 | A kind of multiple-channel output inverse excitation type converter |
| WO2022161184A1 (en) * | 2021-01-29 | 2022-08-04 | 西安领充创享新能源科技有限公司 | Power source module and power source system |
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| CN102427300A (en) * | 2011-10-10 | 2012-04-25 | 浙江大学 | Control method and controller for output voltage of AC-DC (alternating current-direct current) converter |
| CN103795254A (en) * | 2012-10-29 | 2014-05-14 | 华润矽威科技（上海）有限公司 | Flyback switching power supply device and constant voltage controller thereof |
| CN104578790A (en) * | 2014-12-29 | 2015-04-29 | 东南大学 | Digital signal sampling circuit applied to primary-side feedback flyback converter and control method of digital signal sampling circuit |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427300A (en) * | 2011-10-10 | 2012-04-25 | 浙江大学 | Control method and controller for output voltage of AC-DC (alternating current-direct current) converter |
| CN103795254A (en) * | 2012-10-29 | 2014-05-14 | 华润矽威科技（上海）有限公司 | Flyback switching power supply device and constant voltage controller thereof |
| CN104578790A (en) * | 2014-12-29 | 2015-04-29 | 东南大学 | Digital signal sampling circuit applied to primary-side feedback flyback converter and control method of digital signal sampling circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785874A (en) * | 2016-08-30 | 2018-03-09 | 南京中兴新软件有限责任公司 | Power protection method, apparatus and circuit |
| CN107785874B (en) * | 2016-08-30 | 2022-05-10 | 中兴通讯股份有限公司 | Power supply protection method, device and circuit |
| CN108494262A (en) * | 2018-04-20 | 2018-09-04 | 丰县宏祥电子科技有限公司 | The special full isolation DC-DC converter of New-energy electric vehicle |
| CN109149947A (en) * | 2018-09-29 | 2019-01-04 | 北京机械设备研究所 | A kind of multiple-channel output inverse excitation type converter |
| WO2022161184A1 (en) * | 2021-01-29 | 2022-08-04 | 西安领充创享新能源科技有限公司 | Power source module and power source system |
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Application publication date: 20150826 |