CN101110552A - Flyback Pulse Width Modulation Device with Power Saving Mode - Google Patents
Flyback Pulse Width Modulation Device with Power Saving Mode Download PDFInfo
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- CN101110552A CN101110552A CNA2006101056743A CN200610105674A CN101110552A CN 101110552 A CN101110552 A CN 101110552A CN A2006101056743 A CNA2006101056743 A CN A2006101056743A CN 200610105674 A CN200610105674 A CN 200610105674A CN 101110552 A CN101110552 A CN 101110552A
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- 230000000737 periodic effect Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract 2
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims 3
- 238000005516 engineering process Methods 0.000 description 10
- 125000004122 cyclic group Chemical group 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
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- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
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Abstract
A flyback pulse width modulation device with a power-saving mode is completed by adopting an integrated circuit process with a bipolar transistor structure, is used in a power supply, and outputs a periodic pulse signal by using an oscillator circuit. The periodic pulse signal is transmitted to the control end of the power switch through the amplifying circuit so as to periodically turn on the power switch. Meanwhile, a latch circuit is connected to the oscillator circuit, the amplifying circuit, the power switch and a feedback end of the power supply, the potential of a control end of the power switch is periodically pulled down according to a feedback signal generated by the feedback end so as to cut off the power switch, the oscillator circuit is continuously stopped working under light load of the power supply, and the output of the oscillator circuit is recovered when the potential of the feedback signal is reduced, so that the function of a power-saving mode is realized, and the problems of poor withstand voltage and high product cost are solved.
Description
Technical field
The present invention is relevant for a kind of flyback pulse width modulation device with battery saving mode, refers to that especially a kind of integrated circuit technology of bipolar transistor structure of utilizing finishes, and uses in power supply unit, is used for the pulse width modulation device that the power controlling switch switches.
Background technology
By present known DC power supply; in (AC To DCSwitching Power Supply) in the switched power supplier; for dwindling the volume of transformer; use pulse width modulation (PWM) the control VD of high frequency mostly; as shown in Figure 1; circuit diagram for known flyback type electric source supply device; transformer T1 is divided into primary side front stage circuits 101 and secondary side late-class circuit 102 with circuit region; this primary side 101 is the signal of telecommunication that separates this primary side 101 and this secondary side 102 with photistor 111 and optical diode 112 with 102 of this secondary sides; but can utilize the voltage of light signal feedback secondary side 102 or electric current to export variable signal to primary side 101; with the voltage and the current change quantity of this primary side 101 of synchronous adjustment and secondary side 102, perhaps as the feedback signal of overcurrent and short-circuit protection.
Refer again to Fig. 1, wherein at primary side 101 input ac voltage VAC, alternating voltage VAC becomes direct voltage Vin through behind electromagnetic interface filter 1010, bridge rectifier BD1 and the high-voltage filtering capacitor C1.Direct voltage Vin is by the turn-on cycle of pulse modulation control unit U1 power controlling transistor switch Q1, and then is sent to the first side winding of this transformer T1.Simultaneously, the secondary side winding of transformer T1 is the induction output voltage, after this output voltage passes through diode D1 and electrochemical capacitor C2 rectifying and wave-filtering, produces stable DC voltage Vout output.
Direct voltage Vout converts output dc voltage Vout to voltage signal V by feedback regulation device D3 and optical coupler 11
FBFeed back to the pulse width modulation control unit U1 of primary side 101.Simultaneously, when power transistor switch Q1 conducting, obtain current feedback signal Vcs by resistor R 2, current feedback signal Vcs is sent to pulse width modulation control unit U1, and pulse width modulation control unit U1 obtains this current feedback signal Vcs and this voltage signal V
FBTo power transistor switch Q1, be used for stablizing output dc voltage Vout by computing output modulating pulse PWM.
While is based on the raising gradually of environmental consciousness, power supply unit with battery saving mode (Green Mode) design more and more generalizes, and each Pwm controller (PWM IC) design manufacturer competitively releases the Pwm controller of new generation (PWM IC) with battery saving mode design invariably and replaces old product.Pwm controller with battery saving mode is finished with the IC technological design of complementary metal oxide semiconductors (CMOS) (CMOS) structure mostly, but the IC of CMOS (Complementary Metal Oxide Semiconductor) structure has its withstand voltage relatively poor shortcoming, if design is talked about improperly at electrostatic defending (ElectrostaticDischarge; ESD) and shock wave (SURGE) when test bad situation appears easily.Have its complex circuit of Pwm controller of new generation of battery saving mode design on the market and use many assemblies, and can't adopt the integrated circuit (IC) technology of bipolar transistor BYPOLAR structure to finish, because its crystalline areas of integrated circuit (IC) technology of polar transistor BYPOLAR structure is greatly and comparatively power consumption.And price is more more expensive than general Pwm controller (PWM IC) price.
Summary of the invention
In view of this, a kind of flyback pulse width modulation device of the present invention with battery saving mode, be based on known IC technology, its withstand voltage relatively poor problem and the high shortcoming of product cost are improved with Pwm controller (PWM IC) complementary metal oxide semiconductors (CMOS) that technology is used (CMOS) structure of battery saving mode.
A kind of flyback pulse width modulation device of the present invention with battery saving mode, be to adopt the integrated circuit technology of bipolar transistor structure to finish, it uses in power supply unit, being used for the power controlling switch carries out the switching of battery saving mode, the present invention uses pierce circuit, receive accessory power supply voltage by the accessory power supply termination in the power supply unit, and the output cyclic pulse signal.This cyclic pulse signal is sent to the control end of power switch by amplifying circuit, in order to this power switch of periodic conducting.Use latch circuit to be connected to the feedback end of this pierce circuit, this amplifying circuit, this power switch and this power supply unit simultaneously, according to the feedback signal that this feedback end produces, the current potential of this power switch control end of periodically leaving behind is to end this power switch.In addition, power supply unit is under light condition, and the current potential of this feedback signal uprises, and will make this latch circuit continue to stop this pierce circuit work, treat that this feedback signal current potential just recovers this pierce circuit output when descending, to realize the function of battery saving mode (Green Mode).
According to described flyback pulse width modulation device with battery saving mode; further include short-circuit protection circuit; be connected in this accessory power supply end and current sense resistor; to obtain the sensed current signal on this current sense resistor; when sensed current signal during greater than the protection critical value of inner setting; in order to drag down the voltage of this accessory power supply, make it can't provide enough voltage for this pierce circuit operate as normal.
According to described flyback pulse width modulation device with battery saving mode, this latch circuit includes: the first transistor, its collector terminal is connected to this pierce circuit, and emitter terminal is connected to reference edge, and base terminal is connected to the feedback end of this power supply unit; Transistor seconds, its collector terminal is connected to the base terminal of this first transistor, and emitter terminal is connected to the control end of this power switch, and base terminal then is connected to the collector terminal of this first transistor; Filtering capacitor, the one end is connected in the feedback end of this power supply unit, and the other end then is connected to this reference edge; And bias resistance, be connected to the base terminal and the emitter terminal of this transistor seconds.
According to described flyback pulse width modulation device with battery saving mode, this amplifying circuit is an emitter follower.
According to described flyback pulse width modulation device with battery saving mode, this amplifying circuit is the 3rd transistor, its base terminal is connected in this pierce circuit, and collector terminal is connected in this accessory power supply end, and emitter terminal then is connected in the control end of this power switch.
Compared with prior art the present invention has the flyback pulse width modulation device of battery saving mode, adopt the integrated circuit technology of bipolar transistor structure to finish, use is in power supply unit, being used for the power controlling switch carries out the switching of battery saving mode, has improved withstand voltage relatively poor problem and the high shortcoming of product price.In addition, power supply unit is under light condition, and the current potential of feedback signal uprises, and will make latch circuit continue to stop this pierce circuit work, and signal potential to be feedback just recovers pierce circuit output when descending, and has realized the function of battery saving mode.
Above general introduction and ensuing detailed description all are exemplary, are in order to further specify claim of the present invention.And about other purpose of the present invention and advantage, will in follow-up explanation and diagram, be set forth.
Description of drawings
Fig. 1 is the circuit diagram of known flyback type electric source supply device;
Fig. 2 is a circuit diagram of the present invention;
Fig. 3 is the waveform schematic diagram of the present invention's circuit each point under the power supply unit normal load; And
Fig. 4 is the waveform schematic diagram of the present invention's circuit each point under the low load of power supply unit.
Wherein, description of reference numerals is as follows:
Known:
The T1 transformer
101 primary side circuit
The 1010EMI filter
102 secondary side circuit
The VAC alternating voltage
11 optical couplers
12 oscillating circuits
121,122 comparators
123 triggers
111 photistors
112 optical diodes
U1 pulse width modulation control unit
The present invention:
The Q2 power switch
10 pierce circuits
12 latch circuits
14 short-circuit protection circuits
16 amplifying circuits
V
FBFeedback signal
Vc accessory power supply end
The R13 current sense resistor
The Vcs sensed current signal
The Clock cyclic pulse signal
The Q6 the first transistor
The Q5 transistor seconds
The C8 filtering capacitor
The R9 bias resistance
Embodiment
Please refer to Fig. 2, be circuit diagram of the present invention.The flyback pulse width modulation device that the present invention has a battery saving mode is to adopt the integrated circuit technology of bipolar transistor structure to finish, and uses in power supply unit, is used for the switching of power controlling switch Q2.The circuit member of apparatus of the present invention includes: pierce circuit 10, latch circuit 12 and amplifying circuit 16.
As shown in Figure 2, pierce circuit 10 is connected in accessory power supply end Vc in the power supply unit to receive accessory power supply voltage, and output cyclic pulse signal Clock, this cyclic pulse signal Clock is sent to the control end of this power switch Q2 by amplifying circuit 16, in order to this power switch of periodic conducting Q2, this amplifying circuit 16 is the 3rd transistor Q1, its base terminal is connected in this pierce circuit 10, collector terminal is connected in accessory power supply end Vc, emitter terminal then is connected in the control end of this power switch Q2, is emitter follower.Simultaneously, latch circuit 12 is connected in the feedback end FB of this pierce circuit 10, this amplifying circuit 16, this power switch Q2 and this power supply unit, according to the feedback signal V of this feedback end FB generation
FB, the current potential of this power switch Q2 control end of periodically leaving behind is to end this power switch Q2.So the present invention can the periodic conducting of power controlling switch Q2 or ended, under the power supply unit operate as normal, the electric power of power supply unit output is stablized and provided load required electric power.
In addition, the power supply unit in above-mentioned under light condition, this feedback signal V
FBCurrent potential be continuously high potential, will make this latch circuit 12 continue to stop 10 work of this pierce circuit, treat this feedback signal V
FBThe output that current potential just recovers this pierce circuit 10 when descending.
Again with reference to figure 2; apparatus of the present invention further include short-circuit protection circuit 14; be connected in this accessory power supply end Vc and current sense resistor R13; obtain the sensed current signal Vcs on this current sense resistor R13; when protection critical value that sensed current signal Vcs sets greater than short-circuit protection circuit 14; then short-circuit protection circuit 14 can reduce the voltage of this accessory power supply; make it can't provide enough voltage, the protection when reaching the short circuit of power supply unit load end for these pierce circuit 10 operate as normal.
Again with reference to figure 2, in conjunction with the waveform schematic diagram of Fig. 3 the present invention circuit each point under the power supply unit normal load.Pierce circuit 10 is to be connected to form by members such as transistor Q3, Q4, its cyclic pulse signal Clock produces and to be described as follows: the capacitor C 6 in the pierce circuit 10 is connected to accessory power supply end Vc in the power supply unit receiving accessory power supply voltage by resistance R 5, and the action of charging.When capacitor C6 goes up the voltage of foundation through being divided on the resistance R 6, when making voltage on the resistance R 6 greater than the voltage of base-emitter (B-E) knot of transistor Q3, transistor Q3 and transistor Q4 conducting in succession at this moment, can produce pulse signal Clock at the output of diode D4.Then, capacitor C6 can discharge by discharge path, then, and the action of charging as described above once more.So, pierce circuit 10 utilizes capacitor C6 charge and discharge action repeatedly, with output cyclic pulse signal Clock.
With reference to figure 2, this latch circuit 12 includes again: the first transistor Q6, and its collector terminal is connected to the output of this pierce circuit 10, and emitter terminal is connected to reference edge G, and base terminal is connected to the feedback end FB of this power supply unit; Transistor seconds Q5, its collector terminal is connected to the base terminal of this first transistor Q6, and emitter terminal is connected to the control end of this power switch Q2, and base terminal then is connected to the collector terminal of this first transistor Q6; Filtering capacitor C8, one end are connected to the feedback end FB of this power supply unit, and the other end then is connected to this reference edge G; Bias resistance R9 is connected to base terminal and the emitter terminal of this transistor seconds Q5.Wherein this first transistor Q6 and this transistor seconds Q5 are equivalent to thyristor (Silicon Controlled Rectifier; SCR), the various characteristics that has thyristor SCR.
In conjunction with Fig. 2, again with reference to figure 3, when the power supply unit operate as normal, the periodic pulse signal Clock of pierce circuit 10 outputs controls its conducting by amplifying circuit 16 to power switch Q2, current sense resistor R13 can receive the electric current that flows through power switch Q2 and produce sensed current signal Vcs simultaneously, and latch circuit 12 receives the feedback signal V of this sensed current signal Vcs and power supply unit simultaneously
FBWhen the total value of two signals during greater than the voltage of base-emitter (B-E) knot of latch circuit 12 inner the first transistor Q6, the first transistor Q6 and transistor seconds Q5 conducting in succession, and the current potential of the power switch Q2 control end of leaving behind is to end this power switch Q2.So, the present invention uses the periodic pulse signal Clock of pierce circuit 10 outputs to cooperate latch circuit 12 promptly can export the gate terminal of periodic pwm control signal to power switch Q2, the switching of power controlling switch Q2 is to allow the electric power of power supply unit output be stablized and to provide load required electric power.
In conjunction with Fig. 2, with reference to the waveform schematic diagram of figure 4 for the present invention's circuit each point under the low load of power supply unit.When power supply unit during at low loaded work piece, the feedback signal V of power supply unit
FBCan draw high, and feedback signal V
FBWith the total value of sensed current signal Vcs can be very fast the voltage of base-emitter (B-E) knot of arrival latch circuit 12 inner the first transistor Q6, allow the first transistor Q6 and transistor seconds Q5 conducting in succession, and the current potential of the power switch Q2 control end of leaving behind is with by this power switch Q2.So, under the low load of power supply unit, the periodicity pwm control signal of the present invention's output, its work period (Duty Cycle) can be less than being operated under the normal load, to allow the electric power of power supply unit output be stablized and to provide load required electric power.
As described above, because power supply unit is hanging down under the load, latch circuit 12 used in the present invention can be obtained the feedback signal V that continues high potential at the feedback end FB of power supply unit
FB, the feedback signal V of this lasting high potential
FBTo make this latch circuit 12 continue to stop this pierce circuit 10 work, treat this feedback signal V
FBCurrent potential just recovers this pierce circuit 10 outputs when descending, to realize the function of battery saving mode.
In sum, the present invention has the flyback pulse width modulation device of battery saving mode, adopts the integrated circuit technology of bipolar transistor structure to finish, and it uses in power supply unit, is used for the power controlling switch to carry out the switching of battery saving mode.The present invention uses pierce circuit, receive accessory power supply voltage by the accessory power supply termination in the power supply unit, and the output cyclic pulse signal, this cyclic pulse signal is sent to the control end of power switch by amplifying circuit, in order to this power switch of periodic conducting.Use simultaneously, latch circuit is connected to the feedback end of this pierce circuit, this amplifying circuit, this power switch and this power supply unit, according to the feedback signal that this feedback end produces, the current potential of this power switch control end of periodically leaving behind is to end this power switch.
In addition, power supply unit is under light condition, and the current potential of this feedback signal uprises, and will make this latch circuit continue to stop this pierce circuit work, treats that this feedback signal current potential just recovers this pierce circuit output when descending, to realize the function of battery saving mode.
The above, only for the detailed description and the accompanying drawing of the preferred specific embodiment of the present invention, feature of the present invention is not limited thereto, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with following claim, all embodiment that belongs to the spirit variation similar with it of claim of the present invention should be included in the category of the present invention, any those skilled in the art can think easily and variation or modify all can be encompassed in the following claim of the present invention.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101056743A CN100530921C (en) | 2006-07-17 | 2006-07-17 | Flyback pulse width modulation device with power-saving mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101056743A CN100530921C (en) | 2006-07-17 | 2006-07-17 | Flyback pulse width modulation device with power-saving mode |
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| Publication Number | Publication Date |
|---|---|
| CN101110552A true CN101110552A (en) | 2008-01-23 |
| CN100530921C CN100530921C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101056743A Expired - Fee Related CN100530921C (en) | 2006-07-17 | 2006-07-17 | Flyback pulse width modulation device with power-saving mode |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102571051A (en) * | 2012-02-10 | 2012-07-11 | 上海宏力半导体制造有限公司 | Radio frequency switch |
| CN103401422A (en) * | 2011-06-30 | 2013-11-20 | 成都芯源系统有限公司 | Switching power supply and no-load control circuit and control method thereof |
| CN107408892A (en) * | 2015-02-25 | 2017-11-28 | 三美电机株式会社 | Power supply semiconductor device |
| CN108282093A (en) * | 2017-01-05 | 2018-07-13 | 戴洛格半导体公司 | The sensing resistive short of synchronous rectifier detects |
| CN111077194A (en) * | 2019-12-31 | 2020-04-28 | 歌尔微电子有限公司 | Airflow sensor and electronic cigarette |
| CN111900864A (en) * | 2020-08-12 | 2020-11-06 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of switch circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI568119B (en) * | 2014-10-09 | 2017-01-21 | 群光電能科技股份有限公司 | Power supply apparatus with over power protection function |
| US9325246B1 (en) | 2015-01-20 | 2016-04-26 | Chicony Power Technology Co., Ltd. | Flyback apparatus with voltage superposition circuit and overpower protection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5734564A (en) * | 1996-07-26 | 1998-03-31 | Lucent Technologies Inc. | High-efficiency switching power converter |
| CN1452308A (en) * | 2002-04-18 | 2003-10-29 | 姜涛 | Environment protection switch power supply |
-
2006
- 2006-07-17 CN CNB2006101056743A patent/CN100530921C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401422A (en) * | 2011-06-30 | 2013-11-20 | 成都芯源系统有限公司 | Switching power supply and no-load control circuit and control method thereof |
| CN103401422B (en) * | 2011-06-30 | 2015-09-30 | 成都芯源系统有限公司 | Switching power supply and no-load control circuit and load detection circuit thereof |
| CN102571051A (en) * | 2012-02-10 | 2012-07-11 | 上海宏力半导体制造有限公司 | Radio frequency switch |
| CN107408892A (en) * | 2015-02-25 | 2017-11-28 | 三美电机株式会社 | Power supply semiconductor device |
| CN107408892B (en) * | 2015-02-25 | 2019-11-22 | 三美电机株式会社 | Semiconductor device is used in power supply control |
| CN108282093A (en) * | 2017-01-05 | 2018-07-13 | 戴洛格半导体公司 | The sensing resistive short of synchronous rectifier detects |
| CN111077194A (en) * | 2019-12-31 | 2020-04-28 | 歌尔微电子有限公司 | Airflow sensor and electronic cigarette |
| CN111900864A (en) * | 2020-08-12 | 2020-11-06 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of switch circuit |
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| Publication number | Publication date |
|---|---|
| CN100530921C (en) | 2009-08-19 |
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