CN203660875U - Boosting soft start circuit - Google Patents
Boosting soft start circuit Download PDFInfo
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- CN203660875U CN203660875U CN201420016096.6U CN201420016096U CN203660875U CN 203660875 U CN203660875 U CN 203660875U CN 201420016096 U CN201420016096 U CN 201420016096U CN 203660875 U CN203660875 U CN 203660875U
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- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model discloses a boosting soft start circuit which comprises a voltage feedback control circuit. A capacitor C2 and resistors R3 and R4 constitute a feedback voltage supply circuit. One end of the capacitor C2 is connected with a power supply VCC, and the other end of the capacitor C2 is connected with a power ground sequentially through the resistors R3 and R4. A connecting node of the resistors R3 and R4 is connected with a pin B of a switching device U1. A capacitor C3 and a resistor R5 constitute a control circuit of the switching device U1. One end of the capacitor is connected with the power supply VCC, and the other end of the capacitor is connected with the power ground through the resistor R5 and is further connected with a pin C of the switching device U1. A pin A of the switching device U1 is connected with a feedback voltage FB input end. According to the utility model, voltage is obtained by making use of capacitor charging at the start of powering on, and the switching device is connected to the feedback voltage FB input end so as to control initial powering-on voltage of the feedback voltage FB input end, achieve gentle change of the voltage from high to low until the voltage is stable, achieve a soft start effect, reduce surge impact to an APD device, reduce damage and improve the reliability and stability of the circuit.
Description
Technical field
The utility model relates to a kind of start-up circuit, is specifically related to a kind of soft starting circuit that boosts for optical module.
Background technology
Photodiode is the receiving device in optical communication technique, and APD (avalanche diode) is widely used in GPON with its highly sensitive good characteristic, in the application scenarioss such as long-distance transmission.
APD, owing to being operated in avalanche region, needs outside that a reverse bias high pressure (representative value is 30-60V) is provided.The booster circuit that industry is general at present as shown in Figure 1, this circuit is ripe BOOST inductance boost circuit, utilize PWM to control opening and shutting off of metal-oxide-semiconductor M1, make inductance L 1 produce high pressure, by exporting high pressure to APD after rectifier diode D1 and filter capacitor C1 shaping.Produce feedback voltage FB by R1 and two divider resistances of R2, this feedback voltage is exported to control circuit in order to regulate high pressure and voltage stabilizing.As shown in Figure 2, FB feedback voltage and reference voltage Vref error originated from input amplifier U2 compare the feedback control circuit principle of this booster circuit, and the output of error amplifier U2 and a sawtooth waveforms, by after comparator U3, are exported pwm waveform.By controlling the recently regulation output high pressure of duty of PWM.
This booster circuit can produce power on high voltage overshoot and surge current, produce former because: in the time just powering on, boost and do not start, FB voltage is 0, now error comparator U2 can export maximum, be that PWM duty ratio is adjusted to maximum, cause exporting high pressure and reach the maximum of boosting, gradually high pressure is recalled to normal value by FB negative feedback subsequently.This high voltage overshoot can cause APD to puncture, and produced simultaneously surge current can cause certain damage to inductance, affects the reliability of optical module.
Utility model content
The utility model technical issues that need to address are to provide one.
For addressing the above problem, technical solution adopted in the utility model is: the one soft starting circuit that boosts, comprise PWM booster circuit and Voltage Feedback control circuit, described Voltage Feedback control circuit comprises capacitor C 2, C3, resistance R 3～R5, switching device U1, wherein capacitor C 2, resistance R 3, R4 composition feedback voltage provide circuit, capacitor C 2 one termination power VCC, the other end connects power supply ground, the B pin of the connected node connecting valve device U1 of resistance R 3, R4 by resistance R 3, R4 successively; Capacitor C 3, resistance R 5 form the control circuit of switching device U1, electric capacity one termination power VCC, and the other end connects power supply ground by resistance R 5, simultaneously the C pin of connecting valve device U1; The A pin of switching device U1 connects feedback voltage FB input, and in the time of circuit power transmission, the C pin of switching device U1 is high level, the A pin of switching device U1 and the conducting of B pin, and the branch pressure voltage of resistance R 3, R4 is feedback voltage FB.
Described PWM booster circuit comprises inductance L, diode D1, switching tube M1, capacitor C 1, resistance R 1, R2, wherein diode D1, capacitor C 1 form half-wave rectifying circuit, resistance R 1 and R2 composition bleeder circuit, its connected node connects feedback voltage FB input, and inductance L is boost inductance, boosts by the HF switch of switching tube M1.
Adopt the beneficial effect that produces of technique scheme to be: the capacitor charging that the utility model utilization powers on when initial is obtained voltage, and utilize and open device and be connected to feedback voltage FB input, thereby control the initial voltage that powers on of feedback voltage FB input, realize its voltage from high to low until stable smooth variation, realize the effect of soft start, reduce the surge impact to APD device, reduce and damage, improve circuit reliability and stability.
Brief description of the drawings
Fig. 1 is the general booster circuit schematic diagram of prior art;
Fig. 2 is the Voltage Feedback control circuit schematic diagram of prior art;
Fig. 3 is this novel voltage feedback control circuit schematic diagram;
Embodiment
Below in conjunction with accompanying drawing, utility model is described in further detail: this is novel is that state when controlling feedback voltage FB and power on slowly changes from high to low, moves closer to that desired value realizes.This novel PWM booster circuit and Voltage Feedback control circuit of comprising, as shown in Figure 3, described Voltage Feedback control circuit comprises capacitor C 2, C3, resistance R 3～R5, switching device U1, wherein capacitor C 2, resistance R 3, R4 composition feedback voltage provide circuit, capacitor C 2 one termination power VCC, the other end connects power supply ground, the B pin of the connected node connecting valve device U1 of resistance R 3, R4 by resistance R 3, R4 successively; Capacitor C 3, resistance R 5 form the control circuit of switching device U1, electric capacity one termination power VCC, and the other end connects power supply ground by resistance R 5, simultaneously the C pin of connecting valve device U1; The A pin of switching device U1 connects feedback voltage FB input, and in the time of circuit power transmission, the C pin of switching device U1 is high level, the A pin of switching device U1 and the conducting of B pin, and the branch pressure voltage of resistance R 3, R4 is feedback voltage FB.
As shown in Figure 1, described PWM booster circuit comprises inductance L, diode D1, switching tube M1, capacitor C 1, resistance R 1, R2, wherein diode D1, capacitor C 1 form half-wave rectifying circuit, resistance R 1 and R2 composition bleeder circuit, and its connected node connects feedback voltage FB input, inductance L is boost inductance, boosts by the HF switch of switching tube M1.
This novel middle switching device U1 also can use the switch of low-level communications, now, only need to exchange the position (other end is by capacitor C 5 ground connection for position in figure, i.e. R5 mono-termination power VCC) of C3 and R5, just can realize same control effect.Switching device U1 can use metal-oxide-semiconductor switching device, can certainly adopt other analog switch device, as long as can realize function described herein.
Operation principle:
1, this novel in, U1 be high level be communicated with, low level turn-off.Power on initial, power supply VCC charges to capacitor C 3, resistance R 5 to power supply produce the voltage that approaches power supply VCC, the C pin place of connected switching device U1 is high level therewith, switching device U1 switch closure, A pin and B pin are communicated with.
2, power on initially, power supply VCC charges to capacitor C 2, and the original levels of the B pin of switching device U1 is the partial pressure value of R3 and R4.Along with C2 charging, the B pin level of switching device U1 reduces gradually.Because the B pin of switching device U1 connects the input of feedback voltage FB, thereby realize the slow variation from high to low of feedback voltage FB level, thereby booster circuit is boosted by slowly boosting from low to high, reached the object of soft start.
3, along with the C3 of electric capacity charges, the C pin level of switching device U1 reduces gradually, when this pin level is during lower than the unblocked level of switching device U1, switching device U1 turn-offs, pin A and pin B disconnect, feedback voltage FB is subject to the feedback voltage control in booster circuit, avoids FB level control circuit to affect the Wen Ding of booster circuit.
4, in this is novel, can pass through control capacittance C3 and resistance R 5, adjust capacitor charging time constant, control switch closing time.Can, by the resistance of adjusting resistance R3 and R4, adjust the original levels of FB.Can change charge constant by adjusting capacitor C 2, adjust the speed that FB level declines.
Claims (2)
1. the soft starting circuit that boosts, it is characterized in that: comprise PWM booster circuit and Voltage Feedback control circuit, described Voltage Feedback control circuit comprises capacitor C 2, C3, resistance R 3～R5, switching device U1, wherein capacitor C 2, resistance R 3, R4 composition feedback voltage provide circuit, capacitor C 2 one termination power VCC, the other end connects power supply ground, the B pin of the connected node connecting valve device U1 of resistance R 3, R4 by resistance R 3, R4 successively; Capacitor C 3, resistance R 5 form the control circuit of switching device U1, electric capacity one termination power VCC, and the other end connects power supply ground by resistance R 5, simultaneously the C pin of connecting valve device U1; The A pin of switching device U1 connects feedback voltage FB input, and in the time of circuit power transmission, the C pin of switching device U1 is high level, the A pin of switching device U1 and the conducting of B pin, and the branch pressure voltage of resistance R 3, R4 is feedback voltage FB.
2. the soft starting circuit that boosts according to claim 1, it is characterized in that described PWM booster circuit comprises inductance L, diode D1, switching tube M1, capacitor C 1, resistance R 1, R2, wherein diode D1, capacitor C 1 form half-wave rectifying circuit, resistance R 1 and R2 composition bleeder circuit, and its connected node connects feedback voltage FB input, inductance L is boost inductance, boosts by the HF switch of switching tube M1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420016096.6U CN203660875U (en) | 2014-01-09 | 2014-01-09 | Boosting soft start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420016096.6U CN203660875U (en) | 2014-01-09 | 2014-01-09 | Boosting soft start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203660875U true CN203660875U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420016096.6U Expired - Fee Related CN203660875U (en) | 2014-01-09 | 2014-01-09 | Boosting soft start circuit |
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| Country | Link |
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| CN (1) | CN203660875U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107680539A (en) * | 2017-09-30 | 2018-02-09 | 深圳市艾特智能科技有限公司 | The anti-lightning road of backlight |
| CN112467968A (en) * | 2019-09-06 | 2021-03-09 | 新唐科技股份有限公司 | Starting circuit and operation method thereof |
-
2014
- 2014-01-09 CN CN201420016096.6U patent/CN203660875U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107680539A (en) * | 2017-09-30 | 2018-02-09 | 深圳市艾特智能科技有限公司 | The anti-lightning road of backlight |
| CN112467968A (en) * | 2019-09-06 | 2021-03-09 | 新唐科技股份有限公司 | Starting circuit and operation method thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 |