CN103078486A - High-voltage starting circuit in power supply converter - Google Patents
High-voltage starting circuit in power supply converter Download PDFInfo
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- CN103078486A CN103078486A CN2013100090130A CN201310009013A CN103078486A CN 103078486 A CN103078486 A CN 103078486A CN 2013100090130 A CN2013100090130 A CN 2013100090130A CN 201310009013 A CN201310009013 A CN 201310009013A CN 103078486 A CN103078486 A CN 103078486A
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Abstract
The invention discloses a high-voltage starting circuit. The high-voltage starting circuit comprises a high-voltage N-channel depletion type transistor, a first transistor, a diode, a transformer coil, an energy storage capacitor, a second transistor and a resistor type device, wherein a drain end of the high-voltage N-channel depletion type transistor is connected with an HVDC (High Voltage Direct Current) port; a drain end of the first transistor is connected with a source end of the depletion type transistor; a positive end of the diode is connected with the transformer coil, and a negative end of the diode is connected with a source end of the first transistor; the transformer coil is connected with the positive end of the diode; one end of the energy storage capacitor is connected with the negative end of the diode; a drain end of the second transistor is connected with a grating end of the first transistor and a grating end of the depletion type transistor, and a grating end of the second transistor is connected with an SD port and controlled by an SD port signal; and one end of the resistor type device is connected with the source end of the depletion type transistor, and the other end of the resistor type device is connected with the grating end of the depletion type transistor. The high-voltage starting circuit has the advantages that the external arrangement of a starting resistor is avoided, the system integration degree is high, current flowing across the N-channel depletion type transistor is low, the current losses of the starting circuit are effectively reduced, the standby power consumption of the system is reduced, and the starting time is short.
Description
Technical field
The present invention relates to the circuit in a kind of power supply changeover device, special, relate to the high-voltage starting circuit in a kind of power supply changeover device that reduces the system standby loss.
Background technology
It is little that Switching Power Supply has a volume, and the advantage that efficient height and electric current are large is widely used in various occasions.For the chip that power supply is managed, generally adopt the method for external starting resistance, realize from the high pressure power taking, finish the startup of step-down and chip.
Fig. 1 is the circuit diagram that the startup of power management class chip is used, and wherein, 1 is rectifier, and 2 is filter, and the two carries out filtering more first with the commercial power rectification, forms DC level.3 is external starting resistance, and 4 is start-up capacitance, 5 power management chips for the civil power input.Wherein power management chip 5 from the power taking of direct current gauze, is start-up capacitance 4 chargings by starting resistance 4, and when the start-up capacitance level reached starting resistor, chip 5 was started working.This shows, the electric current on the starting resistance 3 can not be turned off, and this is the one tunnel lasting electric current that consumes.Referring to formula (1), the power that starting resistance 3 consumes is by input voltage (U) and the common decision of starting resistance 3 (R) of high pressure gauze.So in order to reduce this part loss, common product can be selected the resistance of larger resistance, is used for reducing power consumption.
This shows, because start-up circuit can't turn-off, will cause higher idling consumption.Secondly, because circuit itself adopts external starting resistance, cause system cost higher.The 3rd, in order to reduce system power dissipation, will adopt the resistance of larger resistance, and this will cause system's startup slower.
And along with the popularizing of awareness of saving energy, extraneous client, the particularly U.S., European client is more and more higher to energy-conservation desired index.How to reduce the stand-by power consumption of system, and reduce the cost of system, improve and treat that motor speed becomes urgent problem.
Summary of the invention
The object of the invention is to solve existing above-mentioned problem in the prior art, propose the start-up circuit in a kind of power supply changeover device that reduces the system standby loss, and the power supply changeover device that uses this start-up circuit.
For reaching this purpose, the present invention by the following technical solutions:
A kind of high-voltage starting circuit, it comprises high-pressure N-shaped depletion mode transistor, and described depletion mode transistor is four port devices, and the drain terminal of wherein said depletion mode transistor connects the HVDC port, from the power supply power taking of HVDC port; The first transistor, described the first transistor are four port devices, and the drain terminal of wherein said the first transistor connects the source of described depletion mode transistor; Diode, the coil of described diode anode connection transformer, negative terminal connects the source of described the first transistor; The coil of transformer, the coil of described transformer connects the anode of described diode; Storage capacitor, an end of described storage capacitor connects the source of negative terminal and the described the first transistor of described diode; Transistor seconds, described transistor seconds is four port devices, the drain terminal of wherein said transistor seconds connects the grid end of described the first transistor and the grid end of described depletion mode transistor, and the grid end of described transistor seconds connects the SD port, accepts the control of SD port signal; The resistor-type device, described resistor-type device one end connects the source of described depletion mode transistor and the drain terminal of described the first transistor, and the other end connects the grid end of described depletion mode transistor and the grid end of described the first transistor.
This high-voltage starting circuit has been avoided using external starting resistance, and level of integrated system is higher, has reduced cost, and the N-type of flowing through to exhaust tube current lower, effectively reduced the current loss of start-up circuit, reduced the stand-by power consumption of system, and start-up time is very fast.
Preferably, described depletion mode transistor is voltage control current mode device, has negative threshold voltage.
Preferably, described the first transistor is isolated transistor, perhaps non-isolated transistor.
Preferably, described resistor-type device is resistance or transistor.
Preferably, also have overvoltage crowbar, described overvoltage crowbar connects the source of described transistor seconds and the anode of described diode, and the source of described transistor seconds and the anode of described diode provide power supply for described overvoltage crowbar.
Behind the power supply electrifying of HVDC end, give low level for the SD port, described depletion mode transistor and described the first transistor are by described resistor-type device biasing conducting, to described energy storage capacitor charging; After charging a period of time, give high level for the SD port, open described transistor seconds, described resistor-type device begins to have electric current to pass through, described resistor-type device for described depletion mode transistor provides negative voltage bias, turn-offs described the first transistor as the load of transistor seconds.
Described condition of giving high level for the SD port is: the vdd voltage that application system detects described storage capacitor reaches the startup requirement, and then system starts working, and gives high level for the SD port.
When the voltage VDD of described storage capacitor has surpassed the protection threshold value, start described overvoltage crowbar, thereby turn-off described start-up circuit, finish the charging action to described storage capacitor.
The highest voltage that can be charged to HVDC of voltage VDD on the described storage capacitor.
The invention also discloses a kind of power supply changeover device, it comprises the as above described high-voltage starting circuit of any one.This power supply changeover device energy consumption is lower, and start-up time is very fast.
Description of drawings
Fig. 1 is the startup application circuit of power management class chip of the prior art;
Fig. 2 is the circuit diagram according to the start-up circuit in a kind of power supply changeover device of the present invention.
The technical characterictic that Reference numeral referred to respectively among the figure is:
1, rectifier; 2, filter; 3, external starting resistance; 4, start-up capacitance; 5, power management chip; 6, high-pressure N-shaped depletion mode transistor; 7, resistor-type device; 8, the first transistor; 9, transistor seconds; 10, overvoltage crowbar; 11, storage capacitor; 12, diode; 13 coils.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.Be understandable that specific embodiment described herein only is used for explaining the present invention, but not limitation of the invention.Also need to prove in addition, for convenience of description, only show part related to the present invention in the accompanying drawing but not entire infrastructure.
In conjunction with the start-up circuit in Fig. 2 specific explanations a kind of power supply changeover device of the present invention.
But this start-up circuit is the circuit of a high voltage startup, comprises high-pressure N-shaped depletion mode transistor 6, resistor-type device 7, the first transistor 8, transistor seconds 9, overvoltage crowbar 10, storage capacitor 11, diode 12, a coil 13 of transformer.
High-pressure N-shaped depletion mode transistor 6 in the start-up circuit is four port devices, have four ports: drain terminal, the grid end, source, substrate terminal, wherein the drain terminal of depletion mode transistor connects HVDC(high-voltage direct current high voltage direct current) port, from the power supply power taking of HVDC end connection, the source of depletion mode transistor can link to each other as isolating device with substrate terminal, substrate terminal also can independent grounding with as non-isolating device.N-type exhausts pipe 6 and has negative threshold voltage, is a voltage control current mode device.
The first transistor 8 is four port devices, and it has four ports: drain terminal, grid end, source, substrate terminal.Wherein the drain terminal of the first transistor 8 is connected with the source of high-pressure N-shaped depletion mode transistor 6, and the source of the first transistor can as the power supply port, connect the anode of storage capacitor 11 and diode 12.The first transistor 8 can be isolated transistor, perhaps non-isolated transistor.
Diode 12 anodes are connected to the coil 13 of transformer, and negative terminal is connected to the source of the first transistor 8.
Storage capacitor 11 is connected to the source of the first transistor 8, and storage capacitor 11 also is connected to the negative terminal of diode 12 simultaneously, and the power supply that diode is provided provides filter function.
Transistor seconds 9 is four-terminal devices, and it has four ports: drain terminal, grid end, source, substrate terminal.Wherein the drain terminal of transistor seconds 9 is connected to the grid end of the first transistor 8 and the grid end of high-pressure N-shaped depletion mode transistor 6, and the grid end of transistor seconds 9 is connected to the SD port, accepts the control of SD port signal.
Resistor-type device 7, the one end is connected to the source of depletion mode transistor 6, and the other end is connected to the grid end of depletion mode transistor 6, for high-pressure N-shaped depletion mode transistor 6 and the first transistor 8 provide bias voltage.When transistor seconds 9 turn-offed, resistor-type device 7 provided bias voltage for the first transistor 8; When transistor seconds 9 was opened, resistor-type device 7 turn-offed the first transistor 8 as the load of transistor seconds 9.Resistor-type device 7 can be resistance or transistor.
The working mechanism of start-up circuit is as follows: behind the power supply electrifying of HVDC end, give low level for the SD port, voltage VDD=0V on the storage capacitor 11, high-pressure N-shaped depletion mode transistor 6 and the first transistor 8 are by the 7 biasing conductings of resistor-type device, for storage capacitor 11 charges.Under this state, on the resistor-type device 7 and no current flow through, so VGS=0 of high-pressure N-shaped depletion mode transistor 6, be zero bias condition, the high-pressure N-shaped depletion mode transistor 6 of this moment can equivalence become a constant-current source, extracting one road constant current from the HVDC port, is storage capacitor 11 chargings by the first transistor 8.
After application system detects voltage VDD on the storage capacitor 11 and reaches the startup threshold value of system, system starts working, give high level for the SD port, transistor seconds 9 is opened, because the unlatching of transistor seconds 9, begin to have electric current to pass through on the resistor-type device 7, the grid terminal potential of the first transistor 8 is dragged down simultaneously.Under this state, the gate source voltage of the first transistor 8 is for negative, and the first transistor 8 is turned off, and the high-pressure N-shaped consumption type to the greatest extent electric current of transistor 6 flows to second transistor 9 by resistor-type device 7.Although also have electric current in the high-pressure N-shaped depletion mode transistor 6 this moment, but because resistor-type device 7 brings pressure drop to provide a negative voltage bias for high-pressure N-shaped depletion mode transistor 6, the electric current of high-pressure N-shaped depletion mode transistor 6 becomes less so that flow through, thereby reaches the purpose of the power consumption that reduces start-up circuit.After start-up circuit cut out, the voltage VDD on the storage capacitor 11 began to descend, until system starts working, a coil 13 of transformer provides electric current by diode 12 for storage capacitor 11.
Because high-pressure N-shaped depletion mode transistor 6 is Voltage-controlled Current Source, so the highest voltage that can be charged to HVDC of voltage VDD on the storage capacitor 11.
As seen, by this high-voltage starting circuit, avoided using external starting resistance, level of integrated system is higher, has reduced cost, and the high-pressure N-shaped depletion mode transistor electric current of flowing through is lower, effectively reduced the current loss of start-up circuit, reduced the stand-by power consumption of system, and start-up time is very fast.
Preferably: for anti-locking system when the misoperation; fail in time to open transistor seconds 9 to turn-off start-up circuit, the damage of transistor seconds 9 and resistor-type device 7 occurs the first transistor 8; increase overvoltage crowbar, to improve the reliability of start-up circuit.
Overvoltage crowbar 10 links to each other with the source of transistor seconds 8 and the anode of diode 12.The anode of the source of transistor seconds 8 and diode 12 is connected to overvoltage crowbar 10 power supply is provided.
When the voltage VDD of storage capacitor 11 has surpassed the protection threshold point, start overvoltage crowbar.The result that this overvoltage crowbar starts is: turn-off start-up circuit, make the charging release to storage capacitor 11.
The invention also discloses a kind of power supply changeover device, it has aforesaid high-voltage starting circuit, therefore used the power supply changeover device of high-voltage starting circuit of the present invention also to have the current loss that reduces start-up circuit, reduced the stand-by power consumption of system, and start-up time advantage faster.
Notice that above-mentioned only is preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that to the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not break away from protection scope of the present invention.Therefore, although by above embodiment the present invention has been carried out comparatively detailed explanation, the present invention is not limited only to above embodiment, in the situation that does not break away from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (10)
1. high-voltage starting circuit, it comprises
High-pressure N-shaped depletion mode transistor, described depletion mode transistor are four port devices, and the drain terminal of wherein said depletion mode transistor connects the HVDC port, from the power supply power taking of HVDC port;
The first transistor, described the first transistor are four port devices, and the drain terminal of wherein said the first transistor connects the source of described depletion mode transistor;
Diode, the coil of described diode anode connection transformer, negative terminal connects the source of described the first transistor;
The coil of transformer, the coil of described transformer connects the anode of described diode;
Storage capacitor, an end of described storage capacitor connects the source of negative terminal and the described the first transistor of described diode;
Transistor seconds, described transistor seconds is four port devices, the drain terminal of wherein said transistor seconds connects the grid end of described the first transistor and the grid end of described depletion mode transistor, and the grid end of described transistor seconds connects the SD port, accepts the control of SD port signal;
The resistor-type device, described resistor-type device one end connects the source of described depletion mode transistor and the drain terminal of described the first transistor, and the other end connects the grid end of described depletion mode transistor and the grid end of described the first transistor.
2. high-voltage starting circuit according to claim 1 is characterized in that:
Described depletion mode transistor is voltage control current mode device, has negative threshold voltage.
3. high-voltage starting circuit according to claim 1 is characterized in that:
Described the first transistor is isolated transistor, perhaps non-isolated transistor.
4. high-voltage starting circuit according to claim 1 is characterized in that:
Described resistor-type device is resistance or transistor.
5. the described high-voltage starting circuit of any one in 4 according to claim 1 is characterized in that:
Also have overvoltage crowbar, described overvoltage crowbar connects the source of described transistor seconds and the anode of described diode, and the source of described transistor seconds and the anode of described diode provide power supply for described overvoltage crowbar.
6. high-voltage starting circuit according to claim 5 is characterized in that:
Behind the power supply electrifying of HVDC end, give low level for the SD port, described depletion mode transistor and described the first transistor are by described resistor-type device biasing conducting, to described energy storage capacitor charging;
After charging a period of time, give high level for the SD port, open described transistor seconds, described resistor-type device begins to have electric current to pass through, described resistor-type device for described depletion mode transistor provides negative voltage bias, turn-offs described the first transistor as the load of transistor seconds.
7. high-voltage starting circuit according to claim 6 is characterized in that:
Described condition of giving high level for the SD port is: the vdd voltage that application system detects described storage capacitor reaches the startup threshold value, and then system starts working, and gives high level for the SD port.
8. high-voltage starting circuit according to claim 7 is characterized in that:
When the voltage VDD of described storage capacitor has surpassed the protection threshold value, start described overvoltage crowbar, thereby turn-off described start-up circuit, finish the charging action to described storage capacitor.
9. the described high-voltage starting circuit of any one in 8 according to claim 6 is characterized in that:
The highest voltage that can be charged to HVDC of voltage VDD on the described storage capacitor.
10. power supply changeover device, it comprises such as the described high-voltage starting circuit of any one among the claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100090130A CN103078486A (en) | 2013-01-10 | 2013-01-10 | High-voltage starting circuit in power supply converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100090130A CN103078486A (en) | 2013-01-10 | 2013-01-10 | High-voltage starting circuit in power supply converter |
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| CN103078486A true CN103078486A (en) | 2013-05-01 |
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| CN2013100090130A Pending CN103078486A (en) | 2013-01-10 | 2013-01-10 | High-voltage starting circuit in power supply converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014206178A1 (en) * | 2013-06-25 | 2014-12-31 | 无锡华润上华半导体有限公司 | Starting circuit of power management chip, and power management chip |
| CN104518654A (en) * | 2013-10-08 | 2015-04-15 | 无锡华润上华半导体有限公司 | High-voltage starting circuit |
| CN110011279A (en) * | 2019-03-18 | 2019-07-12 | 苏州伟创电气设备技术有限公司 | A kind of protective circuit of switch power source and Switching Power Supply Preservation tactics |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
| CN115987257A (en) * | 2023-03-16 | 2023-04-18 | 深圳市力生美半导体股份有限公司 | Current source device and power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014206178A1 (en) * | 2013-06-25 | 2014-12-31 | 无锡华润上华半导体有限公司 | Starting circuit of power management chip, and power management chip |
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| CN110011279A (en) * | 2019-03-18 | 2019-07-12 | 苏州伟创电气设备技术有限公司 | A kind of protective circuit of switch power source and Switching Power Supply Preservation tactics |
| CN113541462A (en) * | 2020-04-20 | 2021-10-22 | 西安鼎芯微电子有限公司 | High-voltage starting circuit and switching power supply circuit |
| CN115987257A (en) * | 2023-03-16 | 2023-04-18 | 深圳市力生美半导体股份有限公司 | Current source device and power supply circuit |
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Application publication date: 20130501 |