CN103986351A - Method for overcoming situation that power supply does not start at low temperature - Google Patents
Method for overcoming situation that power supply does not start at low temperature Download PDFInfo
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- CN103986351A CN103986351A CN201410230400.1A CN201410230400A CN103986351A CN 103986351 A CN103986351 A CN 103986351A CN 201410230400 A CN201410230400 A CN 201410230400A CN 103986351 A CN103986351 A CN 103986351A
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Abstract
The invention provides a method for overcoming the situation that a power supply does not start at low temperature. The detail achieving process is as follows: a differentiating circuit is added, when a PWM MOS tube is switched on, a signal is converted into a triangular wave reserving the upper edge through the differentiating circuit and a Schottky diode, the signal serves as a drive signal for triggering a current flowing-backwards chip, and a synchronous rectifying MOS tube is forced to be switched off through a synchronous rectifying control chip. An anti-flowing-backwards circuit is added, and when the PWM MOS tube is switched on, namely a grid has a high level, a level higher than 3V is generated through the circuit to force the MOS tube to be turned off. Compared with the prior art, temperature control is achieved, the abnormal problem that the power supply does not start or output is unstable at low temperature is solved.
Description
Technical field
The present invention relates to power initiation technology, specifically a kind ofly overcome the method that power supply low temperature does not start.
Background technology
Nowadays, power supply all plays vital effect in each application scenario.Especially various adverse circumstances, as high temperature, low temperature, the environment such as damp and hot.The performance of a lot of power supplys under above adverse circumstances can be along with decline.For example, hot environment, the limitation due to heat radiation, causes power supply overheating failure; And under low temperature environment, due to the inferior position of non-wide temperature chip or circuit itself, cause low temperature output situation unstable or no-output voltage to occur.Traditional power supply temperature-controlled process, nothing more than adopting transducer to detect the voltage of voltage output end or a certain control end, after feedback, realizes temperature by main process chip and controls, and realizes and heating by adding the mode of heating film, guarantees cold-starting; Or control the rotating speed of external fan, to realize equalized temperature, guarantee the stable output of power supply.Circuit of synchronous rectification in certain reaction type topological structure power circuit design as shown in Figure 1, for low-voltage dc signal is carried out to filtering, becomes the direct current signal of low ripple, makes output ripple reach designing requirement.This synchronous rectification scheme is at exceedingly odious environment, and during low temperature, the situation that test there will be the electric current of output capacitor to pour in down a chimney, causes the abnormal and rectification metal-oxide-semiconductor punch through damage of output voltage.Its result causing is under low temperature environment, and power supply does not start or the phenomenon that voltage slowly climbs appears in output abnormality.Apply the power circuit of this circuit of synchronous rectification, major part there will be low temperature not start, the phenomenon of no-output voltage.After the grid voltage of the drain electrode with oscilloscope measurement PWM metal-oxide-semiconductor and secondary commutation metal-oxide-semiconductor, finding, there is situation about simultaneously opening in PWM metal-oxide-semiconductor with secondary commutation metal-oxide-semiconductor.
The method that we this time announce is in circuit, to add a kind of circuit, realizes temperature and controls, and has cancelled transducer and the peripheral components in universal method.From power supply low-temperature working Analysis on Mechanism, in order to overcome power supply, do not start at low temperatures or export unsettled abnormal problem, we have designed a kind of voltage control circuit, fully overcome power supply low temperature and export unsettled problem.
Summary of the invention
Technical assignment of the present invention is in the deficiencies in the prior art, and a kind of method that power supply low temperature does not start that overcomes is provided.
Technical scheme of the present invention realizes in the following manner, and this is a kind of overcomes the method that power supply low temperature does not start, and its specific implementation process is:
One, increase differential circuit, when PWM metal-oxide-semiconductor is opened, this signal is converted into through differential circuit and Schottky diode the class triangular wave that only retains upper edge, as trigger current, pour in down a chimney the driving signal of chip, through synchronous rectification control chip, come forced synchronism rectification metal-oxide-semiconductor to close, prevent that electric current from pouring in down a chimney;
Two, increase anti-back flow circuit, PWM metal-oxide-semiconductor is opened when namely grid is high level, and by this circuit, produce a level higher than 3V and force metal-oxide-semiconductor to be closed,
Be 700ns the metal-oxide-semiconductor time of delay in described step 2, causes PWM metal-oxide-semiconductor at short notice to open with secondary commutation metal-oxide-semiconductor simultaneously.
The beneficial effect that the present invention compared with prior art produced is:
Of the present inventionly a kind ofly overcome the method that power supply low temperature do not start and cancelled transducer and the peripheral components in universal method, realizing temperature controls, from power supply low-temperature working Analysis on Mechanism, overcoming power supply does not start at low temperatures or exports unsettled abnormal problem, practical, applied widely, be easy to promote.
Accompanying drawing explanation
Accompanying drawing 1 is ACDC power supply circuit of synchronous rectification.
Embodiment
To provided by the present invention, a kind ofly overcome the method that power supply low temperature do not start and be described in detail below below.
In adopting reverse exciting topological structure, when PWM metal-oxide-semiconductor is opened under normal circumstances, secondary commutation metal-oxide-semiconductor should be closed.If opened simultaneously, will cause the electric current of secondary capacitance to pour in down a chimney, cause output voltage to be beated, the large electric current simultaneously pouring in down a chimney probably damages secondary commutation metal-oxide-semiconductor.For avoiding U1 to cause at low temperatures secondary commutation metal-oxide-semiconductor extremely to be opened, increase and prevent the circuit that capacitance current pours in down a chimney, when opening, force PWM metal-oxide-semiconductor secondary commutation metal-oxide-semiconductor to turn-off.This circuit is comprised of resistance capacitance and diode.After capacitance-resistance parallel connection, be composed in series anti-back flow circuit with diode.
The invention provides a kind of method that power supply low temperature does not start that overcomes, its specific implementation process is:
One, increase differential circuit, when PWM metal-oxide-semiconductor is opened (when PWM metal-oxide-semiconductor grid is high level), this signal is converted into through differential circuit and Schottky diode the class triangular wave (high level) that only retains upper edge, as trigger current, pour in down a chimney the driving signal of chip, through synchronous rectification control chip, come forced synchronism rectification metal-oxide-semiconductor to close, prevent that electric current from pouring in down a chimney.
Two, increase anti-back flow circuit, PWM metal-oxide-semiconductor is opened when namely grid is high level, produces a level higher than 3V force metal-oxide-semiconductor to be closed by this circuit.
Be 700ns the metal-oxide-semiconductor time of delay in described step 2, causes PWM metal-oxide-semiconductor at short notice to open with secondary commutation metal-oxide-semiconductor simultaneously.
Since being born from phase at end of the nineties in last century synchronous rectification, switch power technology has obtained great development, adopt the synchronous rectification scheme of IC control technology for research and development engineer generally accepts, it is more leading than the rising edge of the pwm pulse signal of primary side that synchronous rectification system drives secondary side the pulse signal of synchronous rectification to be adjusted to dexterously, and the method that trailing edge lags behind has realized the ZVS mode of synchronous rectification MOS and worked.Make great efforts to resolve the soft switch of primary side power MOSFET, and put forth effort to resolve the synchronous rectification of the ZVS mode of secondary side, conversion efficiency can reach more than 94%.More than power density also can reach 200W/in.
We know, in a lot of Power Management Designs, all can use synchronous rectification, and for the output stability under the adverse circumstances that improve power supply especially low temperature, suggestion increases anti-back flow circuit in circuit, to guarantee the stable output of power supply.At present, this circuit has been successfully applied in the power supply of ACDC reaction type topology and DCDC active clamp forward topology structure; Notebook, frame type computer, can apply this circuit in desktop computer and server power supply design from now on, guarantees the regular supply of power supply low temperature environment.
Except the technical characterictic described in specification, be the known technology of those skilled in the art.
Claims (2)
1. overcome the method that power supply low temperature does not start, it is characterized in that its specific implementation process is:
One, increase differential circuit, when PWM metal-oxide-semiconductor is opened, this signal is converted into through differential circuit and Schottky diode the class triangular wave that only retains upper edge, as trigger current, pour in down a chimney the driving signal of chip, through synchronous rectification control chip, come forced synchronism rectification metal-oxide-semiconductor to close, prevent that electric current from pouring in down a chimney;
Two, increase anti-back flow circuit, PWM metal-oxide-semiconductor is opened when namely grid is high level, produces a level higher than 3V force metal-oxide-semiconductor to be closed by this circuit.
2. a kind of method that power supply low temperature does not start that overcomes according to claim 1, is characterized in that: be 700ns the metal-oxide-semiconductor time of delay in described step 2, causes PWM metal-oxide-semiconductor at short notice to open with secondary commutation metal-oxide-semiconductor simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410230400.1A CN103986351A (en) | 2014-05-28 | 2014-05-28 | Method for overcoming situation that power supply does not start at low temperature |
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| CN201410230400.1A CN103986351A (en) | 2014-05-28 | 2014-05-28 | Method for overcoming situation that power supply does not start at low temperature |
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| CN103986351A true CN103986351A (en) | 2014-08-13 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595027A (en) * | 2013-11-07 | 2014-02-19 | 浪潮集团有限公司 | Method for preventing power output currents from flowing backwards |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595027A (en) * | 2013-11-07 | 2014-02-19 | 浪潮集团有限公司 | Method for preventing power output currents from flowing backwards |
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Application publication date: 20140813 |