CN202309501U - Circuit for restraining overshoot output by switch power supply - Google Patents
Circuit for restraining overshoot output by switch power supply Download PDFInfo
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- CN202309501U CN202309501U CN2011203972153U CN201120397215U CN202309501U CN 202309501 U CN202309501 U CN 202309501U CN 2011203972153 U CN2011203972153 U CN 2011203972153U CN 201120397215 U CN201120397215 U CN 201120397215U CN 202309501 U CN202309501 U CN 202309501U
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- power supply
- circuit
- output
- overshoot
- switch power
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- 230000000452 restraining effect Effects 0.000 title abstract 2
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 230000005764 inhibitory process Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 abstract description 11
- 230000009194 climbing Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses a circuit for restraining overshoot output by a switch power supply. The circuit aims at reducing the overshoot voltage output by the switch power supply and increasing the climbing time of the output voltage of the switch power supply. The adopted technical scheme is as follows: the circuit comprises an input end and an output end, wherein the two ends of a sampling resistor at the output end are connected with a RC (remote control) series circuit. The circuit has the advantages that since the connection mode that the RC series circuit is connected at the two ends of the sampling resistor at the output end is adopted, the phenomenon of overshoot output by the switch power supply is effectively restrained by fully utilizing the electric characteristic of charge and discharge of capacitor, and the climbing time of the output voltage of the switch power supply is also in a controllable state.
Description
Technical field
The utility model relates to a kind of switching power circuit, particularly a kind of switching power circuit that suppresses to export overshoot.
Background technology
Switching Power Supply output overshoot with the time-to-climb be an important indicator parameter of Switching Power Supply product, the output overshoot of Switching Power Supply product is too big, directly the damage output equipment is gently then blown out, heavy then some important chip of impact failure.Effectively suppressing the output overshoot is the requisite funtion part of power supply product; The method of conventional suppression output overshoot is a built-in soft start module (as shown in Figure 1) on the mains switch control chip; Before unlatching, produce the vibration of a period of time earlier; Buffering a period of time is just set up normal switch motion, makes output voltage relatively slowly rise to normal working voltage smoothly, reaches the effect that suppresses the output overshoot.Because the soft start module is to be embedded in chip internal, behind the selected control chip, the overshoot of output voltage with the time-to-climb parameter also just limit in the dust.And in reality research and development or use; Said Switching Power Supply can be applied to various output equipments; And said control chip inside pre-sets the time-to-climb, can't satisfy again multiple output equipment to the output overshoot with the time-to-climb requirement, so just restricted the versatility and the compatibility of said Switching Power Supply greatly; Also have some Switching Power Supply control chips itself just not have built-in soft start function in addition, reduced said Switching Power Supply safety of products reliability so more.
Summary of the invention
The purpose of the utility model provides a kind of circuit that suppresses Switching Power Supply output overshoot, the technical problem that solve be reduce Switching Power Supply output overshoot voltage with increase switch power source output voltage the time-to-climb.
The technical scheme that the utility model adopted is:
The circuit of the inhibition Switching Power Supply output overshoot of the utility model comprises input and output, at RC series circuit of the two ends of said output sampling resistor parallel connection.
Described RC series electrical routing resistance and capacitances in series are formed.
Described resistance is adjustable potentiometer.
Described electric capacity is adjustable condenser.
The utility model is owing to be employed in the connected mode of Switching Power Supply output sampling divider resistance two ends parallel connection RC series circuit; The electrical characteristic that makes full use of capacitor charge and discharge has effectively suppressed the phenomenon of Switching Power Supply output overshoot, and make switch power source output voltage the time-to-climb also be in controllable state.
Description of drawings
Fig. 1 is existing Switching Power Supply control chip schematic diagram.
Fig. 2 is existing switching power circuit figure.
Fig. 3 is the switching power circuit figure of the utility model.
Fig. 4 is existing switch power source output voltage performance diagram.
Fig. 5 is the utility model output voltage characteristic curve chart.
Fig. 6 is the utility model embodiment 1 output voltage characteristic curve chart.
Fig. 7 is the utility model embodiment 2 output voltage characteristic curve charts.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.
Like Fig. 2, shown in 3, the circuit of the inhibition Switching Power Supply of the utility model output overshoot is that this RC series circuit is to be composed in series by resistance R B960 and capacitor C B960 at RC series circuit of two ends parallel connection of the sampling resistor of the output of switching power circuit.When the moment of electric power starting, capacitor C B960 begins charging, the suitable short circuit of moment because electric capacity begins to charge; The approximate parallel connection of the divider resistance RB956 of feedback loop and RB960 makes output voltage sampling ratio diminish like this, and output voltage is more on the low side than normal working voltage; Be full of up to CB960; The approximate disconnection, output voltage sampling ratio recover normal, and output voltage rises to the normal working voltage value.Utilize the electrical characteristic of capacitor charge and discharge, when Switching Power Supply starts, output voltage is slowly risen smoothly, up to getting into normal operating conditions through a RC series circuit.
As shown in Figure 4; From the output voltage characteristic curve chart of the Switching Power Supply of prior art, can find out; The acclivity of output voltage waveforms is very steep, the very short 12ms that is merely of rise time, this time-to-climb be the requirement the time-to-climb of not meeting a lot of switch power supply equipments to output voltage;
As shown in Figure 5; From the output voltage characteristic curve chart of the utility model, can find out; Through after switching power circuit improved, the slope of climbing of output voltage is mild relatively and level and smooth, output voltage the time-to-climb be increased to 27ms; Forward overshoot has also diminished, and the output overshoot is suppressed well.
The utility model also can be made as adjustable potentiometer with the resistance R B960 in the RC series circuit, and capacitor C B960 is made as adjustable condenser, the mild degree that can come the slope of climbing of control output voltage through the size of regulating resistance R B960 and capacitor C B960.
In the present embodiment, used resistance R B960 is 15K, and resistance is bigger; Capacitor C B960 is 2.2uF, and capacitance is less, and is as shown in Figure 6, because the capacitance of capacitor C B960 is less, and the time-to-climb 22ms of output voltage, because resistance R B960 resistance is bigger, the flex point on output voltage slope is high slightly again.
As required; Grasp flexibly; Through the method for adjustment RB960 resistance value and CB960 capacitance, the effective characteristic mild peaceful slippage degree of control output voltage, improved well the moment output voltage of starting shooting the time-to-climb; Improve the forward overshoot characteristic of output well, suppressed the output overshoot effectively.And this switching power circuit has good versatility and compatibility.Come to be provided with dexterously the sampling scale parameter of start moment feedback control loop through the RC circuit, thereby effectively suppress the output overshoot of power supply.
Embodiment 2
In the present embodiment, used resistance R B960 is 10K, and resistance is less; Capacitor C B960 is 4.7uF, and capacitance is bigger, and is as shown in Figure 6 because the capacitance of capacitor C B960 is bigger, output voltage the time-to-climb be 37ms, longer, because resistance R B960 resistance is less, the flex point on output voltage slope is just lower again.The capacitance of CB960 is big more, output voltage the time-to-climb just long more; The resistance value of RB960 is more little, and the flex point on output voltage slope is just low more.
Other circuit theory in the present embodiment is analyzed identical with embodiment 1.
Claims (4)
1. a circuit that suppresses Switching Power Supply output overshoot comprises input and output, it is characterized in that: at RC series circuit of the two ends of said output sampling resistor (RB956) parallel connection.
2. the circuit of inhibition Switching Power Supply output overshoot according to claim 1, it is characterized in that: described RC series electrical routing resistance (RB960) and electric capacity (CB960) are composed in series.
3. the circuit of inhibition Switching Power Supply output overshoot according to claim 2, it is characterized in that: described resistance (RB960) is adjustable potentiometer.
4. the circuit of inhibition Switching Power Supply output overshoot according to claim 2, it is characterized in that: described electric capacity (CB960) is adjustable condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203972153U CN202309501U (en) | 2011-10-18 | 2011-10-18 | Circuit for restraining overshoot output by switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203972153U CN202309501U (en) | 2011-10-18 | 2011-10-18 | Circuit for restraining overshoot output by switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202309501U true CN202309501U (en) | 2012-07-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203972153U Expired - Fee Related CN202309501U (en) | 2011-10-18 | 2011-10-18 | Circuit for restraining overshoot output by switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202309501U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612067A (en) * | 2017-01-06 | 2017-05-03 | 浙江凯耀照明股份有限公司 | Overcharging preventive rapid charging circuit |
| WO2022073381A1 (en) * | 2020-10-09 | 2022-04-14 | 海信视像科技股份有限公司 | Power supply circuit and working method thereof |
-
2011
- 2011-10-18 CN CN2011203972153U patent/CN202309501U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612067A (en) * | 2017-01-06 | 2017-05-03 | 浙江凯耀照明股份有限公司 | Overcharging preventive rapid charging circuit |
| WO2022073381A1 (en) * | 2020-10-09 | 2022-04-14 | 海信视像科技股份有限公司 | Power supply circuit and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20121018 |