CN108493899A - A kind of over under-voltage protection circuit with hysteresis - Google Patents
A kind of over under-voltage protection circuit with hysteresis Download PDFInfo
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- CN108493899A CN108493899A CN201810181221.1A CN201810181221A CN108493899A CN 108493899 A CN108493899 A CN 108493899A CN 201810181221 A CN201810181221 A CN 201810181221A CN 108493899 A CN108493899 A CN 108493899A
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- voltage
- foot
- voltage comparator
- control signal
- point
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
Abstract
The present invention relates to power technique fields, a kind of disclosed over under-voltage protection circuit with hysteresis, including input direct-current input power, auxiliary input power, logic output control signal；Single under-voltage point is decomposed into under-voltage protection point（V1）With under-voltage recovery point（V2）, under-voltage protection point can be arranged by resistance R1 ~ R4（V1）With under-voltage recovery point（V2）Voltage, make back-end circuit be not easy to occur to open shutdown repeatedly near under-voltage point；Single overvoltage is decomposed into over-pressed recovery point（V3）And over-voltage protection point（V4）, over-pressed recovery point can be arranged by resistance R5 ~ R8（V3）And over-voltage protection point（V4）Voltage, make back-end circuit be not easy cross pressure point near open shutdown repeatedly；Present invention reduces the numbers that device opens shutdown repeatedly, reduce the probability of device failure, improve the reliability of back-end circuit, improve the service life of device indirectly, realizing reduces product use cost.
Description
Technical field
The present invention relates to a kind of power technique fields more particularly to a kind of over under-voltage protection circuits with hysteresis.
Background technology
The over under-voltage protection circuit of power supply uses window voltage comparator under normal conditions, defeated less than circuit in input voltage
Enter voltage range minimum or higher than circuit input voltage range peak when, turn off the circuit of rear end, reach protection rear end
The function of circuit.In actual circuit, input voltage often near the minimum or peak of circuit input voltage range back and forth
Variation, can cause back-end circuit opens shutdown repeatedly, increases the damage probability of device, reduces the service life of device,
Reduce the reliability of circuit.
Therefore, it is exactly for reducing the minimum when input voltage in circuit input voltage range to design this set new-type circuit
Or when changing back and forth near peak, back-end circuit opens the number of shutdown repeatedly, reduces the probability of device failure, improves
The reliability of back-end circuit improves the service life of device indirectly, and realizing reduces product use cost.
Invention content
A kind of over under-voltage protection circuit with hysteresis proposed by the present invention, the technical issues of capable of solving, are reduced when input
When voltage changes back and forth near the minimum or peak of circuit input voltage range, back-end circuit opens time of shutdown repeatedly
Several problems.The probability for reducing device failure, improves the reliability of back-end circuit.
In order to realize the purpose for solving above-mentioned technical problem, present invention employs following technical solutions：
A kind of over under-voltage protection circuit with hysteresis, including input direct-current input power Vin, voltage signal GND ,+2.5V it is auxiliary
Help input power ,+12V auxiliary input powers, logic output control signal PC1, logic output control signal PC2, resistor R1
~ R8, voltage comparator U1A, U2A, U2B, diode D1, D2.
One end of direct-current input power supplying Vin termination resistors R1, R5；Another termination resistor R3 of resistor R1 and voltage compare
2 feet of device U1A；Another termination voltage signal of resistor R3 ground GND；Mono- termination+2.5V auxiliary input powers of resistor R2, separately
3 feet of one termination voltage comparator U1A；Resistor R4 mono- terminates 1 foot of voltage comparator U1A, another termination voltage comparator
3 feet of U1A；8 feet of voltage comparator U1A connect+12V auxiliary input powers；4 feet of voltage comparator U1A are with connecing voltage signal
GND；The cathode of diode D1 connects 1 foot of pressure comparator U1A, and anode meets logic output control signal PC1.
2 feet of resistor R5 another termination resistor R7 and voltage comparator U2A；Another termination voltage of resistor R7 is believed
Number ground GND；Mono- termination+2.5V auxiliary input powers of resistor R6,3 feet of another termination voltage comparator U2A；Resistor R8 mono-
1 foot of termination voltage comparator U2A, 3 feet of another termination voltage comparator U2A；It is auxiliary that 8 feet of voltage comparator U2A meet+12V
Help input power and 8 feet of voltage comparator U2B；4 feet of voltage comparator U2A with connecing voltage signal GND and voltage comparator
4 feet of U2B；1 foot of voltage comparator U2A connects 6 feet of voltage comparator U2B；5 feet of voltage comparator U2B connect+2.5V auxiliary
Input power；The cathode of diode D2 connects 7 feet of pressure comparator U2B, and anode meets logic output control signal PC2.
Voltage comparator U1A, U2A, U2B, pin definitions are：Pin 1 is 1OUT, and pin 2 is 1IN-, and pin 3 is
1IN+, pin 4 are GND, and pin 5 is 2IN+, and pin 6 is 2IN-, and pin 7 is 2OUT, and pin 8 is VCC.
Specific input DC power Vin voltages are 0V~300V, if input undervoltage protects point（V1）, under-voltage recovery point
（V2）, over-pressed recovery point（V3）, over-voltage protection point（V4）, wherein V1<V2<V3<V4.It can be set as desired by resistance R1 ~ R4
Set under-voltage protection point（V1）With under-voltage recovery point（V2）Voltage, pass through the over-pressed recovery point of resistance R5 ~ R8 setting（V3）And overvoltage
Protection point（V4）Voltage.
It is a kind of that the over under-voltage protection circuit with hysteresis can be achieved, the over under-voltage protection circuit with hysteresis is first set as low level work
Make, high level shutdown；Its working method is：When the DC power supply Vin of input is by 0V → under-voltage recovery point（V2）, voltage comparator
The 2 foot voltages of U1A are less than 3 foot voltages, and 1 foot of voltage comparator U1A exports high level, and logic output control signal PC1 is height
Level；The 2 foot voltages of voltage comparator U2A are less than 3 foot voltages, and the 1 foot output high level of voltage comparator U2A is higher than voltage ratio
5 feet compared with device U2B, logic output control signal PC2 is low level；Logic output control signal PC1 and logic output control letter
Number PC2 is high level after being connected, and back-end circuit does not work.
When the DC power supply Vin of input is by under-voltage recovery point（V2）→ over-voltage protection point（V4）, the 2 of voltage comparator U1A
Foot voltage is higher than 3 foot voltages, and 1 foot of voltage comparator U1A exports low level, and logic output control signal PC1 is low level；Electricity
The 2 foot voltages of comparator U2A are pressed to be less than 3 foot voltages, the 1 foot output high level of voltage comparator U2A is higher than voltage comparator U2B
5 feet, logic output control signal PC2 is low level；Logic output control signal PC1 exports control signal PC2 phases with logic
It is low level, back-end circuit work after even.
When the DC power supply Vin of input is by over-voltage protection point（V4）The 2 foot voltages of → 300V, voltage comparator U1A are higher than 3
1 foot of foot voltage, voltage comparator U1A exports low level, and logic output control signal PC1 is low level；Voltage comparator U2A
2 foot voltages be higher than 3 foot voltages, voltage comparator U2A 1 foot output low level be less than voltage comparator U2B 5 feet, logic
Output control signal PC2 is high level；It is high electricity that logic output control signal PC1, which is exported with logic after control signal PC2 is connected,
Flat, back-end circuit does not work.
When the DC power supply Vin of input is by 300V → overvoltage recovery point（V3）, the 2 foot voltages of voltage comparator U1A are higher than 3
1 foot of foot voltage, voltage comparator U1A exports low level, and logic output control signal PC1 is low level；Voltage comparator U2A
2 foot voltages be higher than 3 foot voltages, voltage comparator U2A 1 foot output low level be less than voltage comparator U2B 5 feet, logic
Output control signal PC2 is high level；It is high electricity that logic output control signal PC1, which is exported with logic after control signal PC2 is connected,
Flat, back-end circuit does not work.
When the DC power supply Vin of input is by over-pressed recovery point（V3）→ under-voltage protection point（V1）, the 2 of voltage comparator U1A
Foot voltage is higher than 3 foot voltages, and 1 foot of voltage comparator U1A exports low level, and logic output control signal PC1 is low level；Electricity
The 2 foot voltages of comparator U2A are pressed to be less than 3 foot voltages, the 1 foot output high level of voltage comparator U2A is higher than voltage comparator U2B
5 feet, logic output control signal PC2 is low level；Logic output control signal PC1 exports control signal PC2 phases with logic
It is low level, back-end circuit work after even.
When the DC power supply Vin of input is by under-voltage protection point（V1）The 2 foot voltages of → 0V, voltage comparator U1A are less than 3 feet
1 foot of voltage, voltage comparator U1A exports high level, and logic output control signal PC1 is high level；Voltage comparator U2A's
2 foot voltages are less than 3 foot voltages, and the 1 foot output high level of voltage comparator U2A is higher than 5 feet of voltage comparator U2B, and logic is defeated
It is low level to go out to control signal PC2；It is high level that logic output control signal PC1, which is exported with logic after control signal PC2 is connected,
Back-end circuit does not work.
By using above-mentioned technical proposal, the present invention has superiority below：
The present invention provides a kind of over under-voltage protection circuit with hysteresis, and single under-voltage point is decomposed into under-voltage protection point（V1）With it is under-voltage
Recovery point（V2）, under-voltage protection point can be arranged by resistance R1 ~ R4（V1）With under-voltage recovery point（V2）Voltage, keep rear end electric
Road is not easy to occur to open shutdown repeatedly near under-voltage point；Single overvoltage is decomposed into over-pressed recovery point（V3）And over-voltage protection point
（V4）, over-pressed recovery point can be arranged by resistance R5 ~ R8（V3）And over-voltage protection point（V4）Voltage, so that back-end circuit is not allowed
Easily shutdown is opened repeatedly near pressure point excessively；The circuit reduces the number that device opens shutdown repeatedly, reduces device failure
Probability, improve the reliability of back-end circuit, indirectly improve device service life, realizing reduces product use cost
's.
Description of the drawings
Fig. 1 is the schematic diagram of the over under-voltage protection circuit with hysteresis of this patent.
Fig. 2 is the input Vin of the over under-voltage protection circuit with hysteresis of this patent and output is logic output control signal
PC1 exports the voltage characteristic figure of the signal after control signal PC2 is connected with logic.
Fig. 3 is the positive logic application principle figure based on the over under-voltage protection circuit with hysteresis.
Fig. 4 is the negative logic application principle figure based on the over under-voltage protection circuit with hysteresis.
Specific implementation mode
This patent is further explained below in conjunction with the accompanying drawings.But the protection domain of this patent is not limited to specifically implement
Mode.
Embodiment 1
In Fig. 3, resistor R9, metal-oxide-semiconductor Q1, logic output control signal PC3, the same Fig. 1 of remaining device.The circuit is realized when defeated
Enter voltage Vin it is normal when, PC3 is high level（High impedance）State；When overvoltage/undervoltage protection occurs for the circuit, PC3 is low level
（Ground connection）State.
When the DC power supply Vin of input is by 0V → under-voltage recovery point（V2）, logic output control signal PC1 and logic export
It is high level to control after signal PC2 is connected, and PC3 is low level（Ground connection）State, back-end circuit are protected；
When the DC power supply Vin of input is by under-voltage recovery point（V2）→ over-voltage protection point（V4）, logic output control signal PC1 with
Logic output control signal PC2 is low level after being connected, and PC3 is high level（High impedance）State, back-end circuit are working properly；
When the DC power supply Vin of input is by over-voltage protection point（V4）→ 300V, logic output control signal PC1 are controlled with logic output
Signal PC2 processed is high level after being connected, and PC3 is low level（Ground connection）State, back-end circuit are protected；
When the DC power supply Vin of input is by 300V → overvoltage recovery point（V3）, logic output control signal PC1 is exported with logic to be controlled
Signal PC2 processed is high level after being connected, and PC3 is low level（Ground connection）State, back-end circuit are protected；
When the DC power supply Vin of input is by over-pressed recovery point（V3）→ under-voltage protection point（V1）, logic output control signal PC1 with
Logic output control signal PC2 is low level after being connected, PC3 is high level（High impedance）State, back-end circuit are working properly；
When the DC power supply Vin of input is by under-voltage protection point（V1）→ 0V, logic output control signal PC1 are controlled with logic output
Signal PC2 is high level after being connected, and PC3 is low level（Ground connection）State, back-end circuit are protected.
Embodiment 2
In Fig. 4, resistor R10, R11, antilogical optocoupler U3, logic output control signal PC4, logic output control signal ground
PC4-GND, the same Fig. 1 of remaining device.The circuit is realized when input voltage vin is normal, and PC4 is low level（Ground connection）State；
When overvoltage/undervoltage protection occurs for the circuit, PC4 is high level（High impedance）State.The also effect of front and back end isolation.
When the DC power supply Vin of input is by 0V → under-voltage recovery point（V2）, logic output control signal PC1 and logic export
It is high level to control after signal PC2 is connected, and PC4 is high level（High impedance）State, back-end circuit are protected；
When the DC power supply Vin of input is by under-voltage recovery point（V2）→ over-voltage protection point（V4）, logic output control signal PC1 with
Logic output control signal PC2 is low level after being connected, and PC4 is low level（Ground connection）State, back-end circuit are working properly；
When the DC power supply Vin of input is by over-voltage protection point（V4）→ 300V, logic output control signal PC1 are controlled with logic output
Signal PC2 processed is high level after being connected, and PC4 is high level（High impedance）State, back-end circuit are protected；
When the DC power supply Vin of input is by 300V → overvoltage recovery point（V3）, logic output control signal PC1 is exported with logic to be controlled
Signal PC2 processed is high level after being connected, and PC4 is high level（High impedance）State, back-end circuit are protected；
When the DC power supply Vin of input is by over-pressed recovery point（V3）→ under-voltage protection point（V1）, logic output control signal PC1 with
Logic output control signal PC2 is low level after being connected, PC4 is low level（Ground connection）State, back-end circuit are working properly；
When the DC power supply Vin of input is by under-voltage protection point（V1）→ 0V, logic output control signal PC1 are controlled with logic output
Signal PC2 is high level after being connected, and PC4 is high level（High impedance）State, back-end circuit are protected.
Claims (5)
1. a kind of over under-voltage protection circuit with hysteresis, it is characterized in that：Including input direct-current input power Vin, voltage signal
GND ,+2.5V auxiliary input power ,+12V auxiliary input powers, logic output control signal PC1, logic output control signal
PC2, resistor R1 ~ R8, voltage comparator U1A, U2A, U2B, diode D1, D2；
One end of direct-current input power supplying Vin termination resistors R1, R5；Another termination resistor R3 of resistor R1 and voltage comparator
2 feet of U1A；Another termination voltage signal of resistor R3 ground GND；Mono- termination+2.5V auxiliary input powers of resistor R2, it is another
3 feet of termination voltage comparator U1A；Resistor R4 mono- terminates 1 foot of voltage comparator U1A, another termination voltage comparator U1A
3 feet；8 feet of voltage comparator U1A connect+12V auxiliary input powers；4 feet of voltage comparator U1A with connecing voltage signal GND；
The cathode of diode D1 connects 1 foot of pressure comparator U1A, and anode meets logic output control signal PC1；
2 feet of resistor R5 another termination resistor R7 and voltage comparator U2A；Another termination voltage signal of resistor R7
GND；Mono- termination+2.5V auxiliary input powers of resistor R6,3 feet of another termination voltage comparator U2A；Resistor R8 mono- is terminated
1 foot of voltage comparator U2A, 3 feet of another termination voltage comparator U2A；It is defeated that 8 feet of voltage comparator U2A connect+12V auxiliary
Enter power supply and 8 feet of voltage comparator U2B；4 feet of voltage comparator U2A with connecing voltage signal GND and voltage comparator U2B
4 feet；1 foot of voltage comparator U2A connects 6 feet of voltage comparator U2B；5 feet of voltage comparator U2B connect+2.5V auxiliary inputs
Power supply；The cathode of diode D2 connects 7 feet of pressure comparator U2B, and anode meets logic output control signal PC2.
2. a kind of over under-voltage protection circuit with hysteresis according to claim 1, it is characterized in that：The DC power supply Vin
Voltage is 0V~300V DC voltages, and input undervoltage protects point（V1）, under-voltage recovery point（V2）, over-pressed recovery point（V3）, overvoltage
Protection point（V4）It is adjustable ,+2.5V auxiliary input powers ,+12V auxiliary input powers voltage be according to actual needs flexibly choosing
It selects.
3. according to claim 1 can with the over under-voltage protection circuit of hysteresis, it is characterized in that：The list is under-voltage, and point decomposes
For under-voltage protection point（V1）With under-voltage recovery point（V2）, under-voltage protection point is arranged by resistance R1 ~ R4（V1）With under-voltage recovery point
（V2）Voltage, make back-end circuit be not easy to occur to open shutdown repeatedly near under-voltage point；It is extensive that single overvoltage is decomposed into overvoltage
Complex point（V3）And over-voltage protection point（V4）, pass through the over-pressed recovery point of resistance R5 ~ R8 settings（V3）And over-voltage protection point（V4）Electricity
Pressure makes back-end circuit avoid opening shutdown repeatedly near pressure point excessively.
4. according to claim 1 can with the over under-voltage protection circuit of hysteresis, it is characterized in that：The input DC power
Vin voltages are 0V~300V, if input undervoltage protects point（V1）, under-voltage recovery point（V2）, over-pressed recovery point（V3）, overvoltage protection
Point（V4）, wherein V1<V2<V3<V4；As desired by resistance R1 ~ R4, under-voltage protection point is set（V1）With under-voltage recovery point
（V2）Voltage, pass through the over-pressed recovery point of resistance R5 ~ R8 setting（V3）And over-voltage protection point（V4）Voltage.
5. it is a kind of can be achieved the over under-voltage protection circuit with hysteresis working method, first set the over under-voltage protection circuit with hysteresis as
Low level works, high level shutdown；Its working method is：When the DC power supply Vin of input is by 0V → under-voltage recovery point（V2）, electricity
The 2 foot voltages of comparator U1A are pressed to be less than 3 foot voltages, 1 foot of voltage comparator U1A exports high level, logic output control signal
PC1 is high level；The 2 foot voltages of voltage comparator U2A are less than 3 foot voltages, and the 1 foot output high level of voltage comparator U2A is high
In 5 feet of voltage comparator U2B, logic output control signal PC2 is low level；Logic output control signal PC1 and logic are defeated
It is high level to go out to control after signal PC2 is connected, and back-end circuit does not work；
When the DC power supply Vin of input is by under-voltage recovery point（V2）→ over-voltage protection point（V4）, the 2 feet electricity of voltage comparator U1A
Pressure is higher than 3 foot voltages, and 1 foot of voltage comparator U1A exports low level, and logic output control signal PC1 is low level；Voltage ratio
The 2 foot voltages compared with device U2A are less than 3 foot voltages, and the 1 foot output high level of voltage comparator U2A is higher than the 5 of voltage comparator U2B
Foot, logic output control signal PC2 is low level；After logic output control signal PC1 is connected with logic output control signal PC2
For low level, back-end circuit work；
When the DC power supply Vin of input is by over-voltage protection point（V4）The 2 foot voltages of → 300V, voltage comparator U1A are higher than 3 feet electricity
1 foot of pressure, voltage comparator U1A exports low level, and logic output control signal PC1 is low level；The 2 of voltage comparator U2A
Foot voltage is higher than 3 foot voltages, and the 1 foot output low level of voltage comparator U2A is less than 5 feet of voltage comparator U2B, logic output
It is high level to control signal PC2；It is high level that logic output control signal PC1, which is exported with logic after control signal PC2 is connected, after
Terminal circuit does not work；
When the DC power supply Vin of input is by 300V → overvoltage recovery point（V3）, the 2 foot voltages of voltage comparator U1A are higher than 3 feet electricity
1 foot of pressure, voltage comparator U1A exports low level, and logic output control signal PC1 is low level；The 2 of voltage comparator U2A
Foot voltage is higher than 3 foot voltages, and the 1 foot output low level of voltage comparator U2A is less than 5 feet of voltage comparator U2B, logic output
It is high level to control signal PC2；It is high level that logic output control signal PC1, which is exported with logic after control signal PC2 is connected, after
Terminal circuit does not work；
When the DC power supply Vin of input is by over-pressed recovery point（V3）→ under-voltage protection point（V1）, the 2 feet electricity of voltage comparator U1A
Pressure is higher than 3 foot voltages, and 1 foot of voltage comparator U1A exports low level, and logic output control signal PC1 is low level；Voltage ratio
The 2 foot voltages compared with device U2A are less than 3 foot voltages, and the 1 foot output high level of voltage comparator U2A is higher than the 5 of voltage comparator U2B
Foot, logic output control signal PC2 is low level；After logic output control signal PC1 is connected with logic output control signal PC2
For low level, back-end circuit work；
When the DC power supply Vin of input is by under-voltage protection point（V1）The 2 foot voltages of → 0V, voltage comparator U1A are less than 3 feet electricity
1 foot of pressure, voltage comparator U1A exports high level, and logic output control signal PC1 is high level；The 2 of voltage comparator U2A
Foot voltage is less than 3 foot voltages, and the 1 foot output high level of voltage comparator U2A is higher than 5 feet of voltage comparator U2B, logic output
It is low level to control signal PC2；It is high level that logic output control signal PC1, which is exported with logic after control signal PC2 is connected, after
Terminal circuit does not work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181221.1A CN108493899B (en) | 2018-03-06 | 2018-03-06 | Take under-voltage protection circuit that crosses of hysteresis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810181221.1A CN108493899B (en) | 2018-03-06 | 2018-03-06 | Take under-voltage protection circuit that crosses of hysteresis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108493899A true CN108493899A (en) | 2018-09-04 |
| CN108493899B CN108493899B (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810181221.1A Active CN108493899B (en) | 2018-03-06 | 2018-03-06 | Take under-voltage protection circuit that crosses of hysteresis |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201846066U (en) * | 2010-11-19 | 2011-05-25 | 东莞市奥源电子科技有限公司 | Undervoltage protective circuit with delaying function |
| CN202159973U (en) * | 2011-07-07 | 2012-03-07 | 天津市松正电动汽车技术股份有限公司 | Voltage detection protection circuit |
| CN103052200A (en) * | 2011-10-13 | 2013-04-17 | 欧司朗股份有限公司 | Illumination control system and control method thereof |
| CN206962444U (en) * | 2017-07-25 | 2018-02-02 | 郑州瑞能电源技术有限公司 | One kind input over under-voltage protection circuit |
-
2018
- 2018-03-06 CN CN201810181221.1A patent/CN108493899B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201846066U (en) * | 2010-11-19 | 2011-05-25 | 东莞市奥源电子科技有限公司 | Undervoltage protective circuit with delaying function |
| CN202159973U (en) * | 2011-07-07 | 2012-03-07 | 天津市松正电动汽车技术股份有限公司 | Voltage detection protection circuit |
| CN103052200A (en) * | 2011-10-13 | 2013-04-17 | 欧司朗股份有限公司 | Illumination control system and control method thereof |
| CN206962444U (en) * | 2017-07-25 | 2018-02-02 | 郑州瑞能电源技术有限公司 | One kind input over under-voltage protection circuit |
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| Publication number | Publication date |
|---|---|
| CN108493899B (en) | 2020-02-07 |
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