CN201260064Y - Protection device for inputting over or under voltage - Google Patents
Protection device for inputting over or under voltage Download PDFInfo
- Publication number
- CN201260064Y CN201260064Y CNU200820110301XU CN200820110301U CN201260064Y CN 201260064 Y CN201260064 Y CN 201260064Y CN U200820110301X U CNU200820110301X U CN U200820110301XU CN 200820110301 U CN200820110301 U CN 200820110301U CN 201260064 Y CN201260064 Y CN 201260064Y
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- comparator
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- diode
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- Control Of Voltage And Current In General (AREA)
Abstract
The utility model discloses an input over/under voltage protection device, which is used in the module power supplies. The input over/under voltage protection device comprises a first comparator, a second comparator and a plurality resistors; wherein, the reverse input end of the first comparator is connected with an over-voltage reference potential; the homodromous input end of the second comparator is connected with an under-voltage reference potential; the homodromous input ends of the first comparator and the second comparator are connected together and are connected between a first resistor (3R16) and a second resistor (3R17); the other end of the second resistor (3R17) is grounded; the other end of the first resistor (3R16) is connected with the output end of a PWM control chip inner error amplifier in the power supply module; and the output ends of the first comparator and the second comparator are connected with an electric current sensing end of the PWM control chip. Compared with prior art, the input over/under voltage protection device can further reduce the number of the insolating components, reduce the device cost, and improve the working reliability of the device.
Description
Technical field
The utility model relate to a kind of input that is used for modular power source less voltage protector, belong to the modular power source technical field.
Background technology
In order to improve the adaptability of modular power source product, general modular power source all requires to have perfect safeguard measure, for example at the safeguard measure of input overvoltage, under voltage etc.But the enforcement of various safeguard measures can make the circuit complexity of modular power source.In safeguard measure, need a large amount of the use to isolate components and parts such as optocoupler etc. in addition, make the cost up of whole modular power source, reliability reduce.
Fig. 1 has shown a kind of control chip and secondary altogether isolated form modular power source.For this isolated form modular power source, it typically imports overvoltage, under voltage protection scheme as shown in Figure 2.In this protection scheme, at first from former sampling edge input voltage signal, this voltage signal and given over-voltage protection point or under-voltage protection point compare, if the scope of overshoot, then send the voltage signal that transfinites, protection end or the pulse width control end of delivering to control chip after isolating block driving pulse, implement protection; If the scope of not overshoot, then this invalidating signal.
At present, for take normal shock, recommend, the modular power source of circuit topologies such as half-bridge, full-bridge, its input overvoltage, under voltage protection scheme be often no longer from former sampling edge input voltage, and from secondary sampling input voltage.Because output voltage is directly proportional with the duty ratio of input voltage and PWM drive signal, duty ratio is directly proportional with error signal, so under the certain condition of output voltage, the pulse duration and the input voltage of PWM drive signal are inversely proportional to.Therefore, just can learn input voltage signal indirectly, compare, send the voltage signal that whether transfinites, carry out corresponding action with given over-voltage protection point, under-voltage protection point by the sampling error signal.
In the patent No. is 200420087581.9 Chinese utility model patent, discloses a kind of intelligent magnetic and kept the under voltage protection device.This protector is installed in single-phase subscriber's line front end, utilizes the switch of magnetic latching relay as the disjunction circuit, utilizes Single Chip Microcomputer (SCM) program to realize that line voltage distribution surpasses the automatic line disconnection of 260 ± 5V, returns to 235 ± 5V and connects circuit automatically.But because this is crossed the under voltage protection device and need use single-chip microcomputer, therefore the cost of implementing is higher.
Summary of the invention
The purpose of this utility model is to provide a kind of less voltage protector of importing.This device can be used in the modular power source product.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of less voltage protector of importing is used in the modular power source, it is characterized in that:
The described less voltage protector of importing comprises first comparator, second comparator and a plurality of resistance;
The reverse input end of described first comparator connects the overvoltage reference potential, and the input in the same way of described second comparator connects under-voltage reference potential;
The input in the same way of described first comparator and described second comparator links together, and is connected between first resistance (3R16) and second resistance (3R17);
An other end ground connection of described second resistance (3R17), the output of the pwm chip internal error amplifier in the other end link block power supply of described first resistance (3R16);
The output of described first comparator and described second comparator links together, and connects the current sense end of described pwm chip simultaneously.
The output of described first comparator connects first diode, and the output of described second comparator connects second diode, and the negative electrode of described first diode and second diode is connected in parallel.
Described pwm chip is any one among the UC3842/3843.
Compared with prior art, the less voltage protector of importing provided by the utility model has further reduced the quantity of isolating components and parts, thereby has reduced the cost of this device on the one hand, has also improved the functional reliability of whole device in addition on the one hand.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Fig. 1 is a kind of control chip and secondary altogether the circuit theory diagrams of isolated form modular power source;
Fig. 2 is the input overvoltage of isolated form modular power source shown in Figure 1, the schematic diagram of under voltage protection scheme;
Fig. 3 imported the operation principle schematic diagram of less voltage protector for this.
Embodiment
As shown in Figure 3, this was imported less voltage protector and comprised two comparator 3N1C and 3N1B, diode and a plurality of resistance.Wherein the reverse input end of the input in the same way of comparator 3N1C and comparator 3N1B meets reference potential V behind resistance
REF, the input in the same way of the reverse input end of comparator 3N1C and comparator 3N1B links together, and is connected between resistance 3R16 and the 3R17.The other end ground connection of resistance 3R17,1 pin of the pwm chip N1 in the other end link block power supply of resistance 3R16.The output of comparator 3N1C connects the anode of diode D2, and the output of comparator 3N1B connects the anode of diode D3.The negative electrode of diode D2 and D3 is connected in parallel, and inserts 3 pin of pwm chip N1 simultaneously.Pwm chip N1 herein can be any one among the UC3842/3843.
The above-mentioned course of work of importing less voltage protector is such: the reference potential that reverse input end connect of comparator 3N1B is as the overvoltage reference potential, and the reference potential that input connect in the same way of comparator 3N1C is as under-voltage reference potential.1 pin of pwm chip N1 is as the output of internal error amplifier, secondary from transformer T1 through resistance R 8 and R12 sampling input voltage signal, after passing through resistance 3R16,3R17 dividing potential drop again, compare with above-mentioned overvoltage reference potential and under-voltage reference potential.The output of comparator 3N1C is sent the overvoltage signal, and the output of comparator 3N1B is sent under-voltage signal.Two signals that transfinite are delivered to 3 pin (current sense end) of pwm chip N1 after the logical "or" computing.As long as 3 pin receive high level signal, pwm chip N1 just blocks output, stops driven MOS pipe V5, thereby makes modular power source be in stopped status, realizes the protection to input overvoltage or under voltage situation.
Above this being imported less voltage protector has been described in detail.For one of ordinary skill in the art, any conspicuous change of under the prerequisite that does not deviate from the utility model connotation it being done all will constitute to the utility model infringement of patent right, with corresponding legal responsibilities.
Claims (3)
1. imported less voltage protector for one kind, be used in the modular power source, it is characterized in that:
The described less voltage protector of importing comprises first comparator, second comparator and a plurality of resistance;
The reverse input end of described first comparator connects the overvoltage reference potential, and the input in the same way of described second comparator connects under-voltage reference potential;
The input in the same way of described first comparator and described second comparator links together, and is connected between first resistance (3R16) and second resistance (3R17);
An other end ground connection of described second resistance (3R17), the internal error amplifier out of the pwm chip in the other end link block power supply of described first resistance (3R16);
The output of described first comparator and described second comparator links together, and connects the current sense end of described pwm chip simultaneously.
2. the less voltage protector of importing as claimed in claim 1 is characterized in that:
The output of described first comparator connects the anode of first diode, and the output of described second comparator connects the anode of second diode, and the negative electrode of described first diode and second diode is connected in parallel.
3. the less voltage protector of importing as claimed in claim 1 is characterized in that:
Described pwm chip is any one among the UC3842/3843.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820110301XU CN201260064Y (en) | 2008-08-29 | 2008-08-29 | Protection device for inputting over or under voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820110301XU CN201260064Y (en) | 2008-08-29 | 2008-08-29 | Protection device for inputting over or under voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201260064Y true CN201260064Y (en) | 2009-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820110301XU Expired - Fee Related CN201260064Y (en) | 2008-08-29 | 2008-08-29 | Protection device for inputting over or under voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201260064Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014005399A1 (en) * | 2012-07-06 | 2014-01-09 | 湖南三一智能控制设备有限公司 | Overvoltage protection circuit and current sampling device |
| CN104638608A (en) * | 2013-11-06 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN107947121A (en) * | 2017-12-12 | 2018-04-20 | 成都爱特联科技有限公司 | A kind of Switching Power Supply with over-and under-voltage defencive function |
-
2008
- 2008-08-29 CN CNU200820110301XU patent/CN201260064Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014005399A1 (en) * | 2012-07-06 | 2014-01-09 | 湖南三一智能控制设备有限公司 | Overvoltage protection circuit and current sampling device |
| CN104638608A (en) * | 2013-11-06 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN107947121A (en) * | 2017-12-12 | 2018-04-20 | 成都爱特联科技有限公司 | A kind of Switching Power Supply with over-and under-voltage defencive function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING TONLIER ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER NAME: TONLIER ENERGY-SAVING SYSTEM (BEIJING) LLC |
|
| CP01 | Change in the name or title of a patent holder |
Address after: The 101111 branch of the Beijing economic and Technological Development Zone No. nine fourteen Street Patentee after: Beijing Tonlier Energy-saving LLC. Address before: The 101111 branch of the Beijing economic and Technological Development Zone No. nine fourteen Street Patentee before: Tonlier Energy Technology(Beijing)Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090617 Termination date: 20140829 |
|
| EXPY | Termination of patent right or utility model |