CN107949100A - A kind of delay startup LED driver - Google Patents
A kind of delay startup LED driver Download PDFInfo
- Publication number
- CN107949100A CN107949100A CN201711142681.5A CN201711142681A CN107949100A CN 107949100 A CN107949100 A CN 107949100A CN 201711142681 A CN201711142681 A CN 201711142681A CN 107949100 A CN107949100 A CN 107949100A
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- CN
- China
- Prior art keywords
- circuit
- voltage
- led driver
- input
- signal generation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Led Devices (AREA)
Abstract
The invention discloses a kind of delay startup LED driver, including voltage sampling circuit, reference voltage circuit, voltage comparator circuit, control signal generation circuit and current control circuit, the output terminal of voltage sampling circuit and the output terminal of reference voltage circuit are connected respectively to two input terminals of voltage comparator circuit, the output terminal of voltage comparator circuit is connected to the input terminal of control signal generation circuit, and the output terminal of control signal generation circuit is connected to the input terminal of current control circuit.The LED driver of the present invention can realize delay startup, the serious and damage internal component it is possible to prevente effectively from LED driver because starting overtension, is generated heat.
Description
Technical field
The present invention relates to a kind of LED driver, particularly a kind of delay startup LED driver.
Background technology
Existing LED driver does not have soft start function generally, due to the moment opened in LED driver, voltage instantaneous
Rise, easily causes to impact to the component inside LED driver, heavy then can damage LED gently then so that driver fever is serious
The internal component of driver.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of delay startup LED driver.
Technical solution is used by the present invention solves the problems, such as it：A kind of delay startup LED driver, including voltage sample electricity
Road, reference voltage circuit, voltage comparator circuit, control signal generation circuit and current control circuit, voltage sampling circuit it is defeated
The output terminal of outlet and reference voltage circuit is connected respectively to two input terminals of voltage comparator circuit, voltage comparator circuit it is defeated
Outlet is connected to the input terminal of control signal generation circuit, and the output terminal of control signal generation circuit is connected to current control circuit
Input terminal.
Further, voltage sampling circuit collection input voltage, and it is more electric that the input voltage collected is transmitted to voltage
The input terminal on road, reference voltage circuit produce the voltage of predefined size, and the voltage of generation is transmitted to voltage comparator circuit
Another input terminal.
Further, voltage comparator circuit produces comparative result according to the input voltage of two input terminals, and by comparative result
It is transmitted to control signal generation circuit.
Further, control signal generation circuit produces control instruction according to comparative result, and control instruction is transmitted to electricity
Flow control circuit.
Further, current control circuit adjusts the charging current of its internal electric source according to the control instruction received.
The beneficial effects of the invention are as follows：The present invention is a kind of delay startup LED driver, and the present invention passes through voltage sampling circuit
Input voltage is gathered, and the input voltage is input to an input terminal of voltage comparator circuit, reference voltage circuit produces use
In the reference voltage compared, and the reference voltage is input to another input terminal of voltage comparator circuit, voltage comparator circuit
Compare the size of two input terminal input voltages, and the comparative result is input to the input terminal of control signal generation circuit, control
Signal generating circuit processed generates current controling signal according to comparative result and current controling signal is input to current control circuit,
Current control circuit is charged to reduce opening for LED driver when input voltage is excessive, using input voltage to its internal electric source
Streaming current, the charging current of its internal electric source is less and less, and the starting current of LED driver is just increasing, reaches LED drivings
The purpose of device delay startup.The LED driver of the present invention can realize delay startup, it is possible to prevente effectively from LED driver is because start
Overtension, fever is serious and damages internal component.
Brief description of the drawings
The invention will be further described with example below in conjunction with the accompanying drawings.
Fig. 1 is the circuit block diagram of the present invention.
Embodiment
Fig. 1 is the circuit block diagram of the present invention, as shown in Figure 1, a kind of delay startup LED driver, including voltage sampling circuit
1st, reference voltage circuit 5, voltage comparator circuit 2, control signal generation circuit 3 and current control circuit 4, voltage sampling circuit 1
Output terminal and the output terminal of reference voltage circuit 5 be connected respectively to two input terminals of voltage comparator circuit 2, voltage is more electric
The output terminal on road 2 is connected to the input terminal of control signal generation circuit 3, and the output terminal of control signal generation circuit 3 is connected to electricity
The input terminal of flow control circuit 4.The present invention gathers input voltage by voltage sampling circuit 1, and the input voltage is input to
One input terminal of voltage comparator circuit 2, reference voltage circuit 5, which produces, is used for the reference voltage that compares, and by the reference voltage
Another input terminal of voltage comparator circuit 2 is input to, voltage comparator circuit 2 compares the size of two input terminal input voltages,
And the comparative result is input to the input terminal of control signal generation circuit 3, control signal generation circuit 3 is given birth to according to comparative result
Current control circuit 4 is input into current controling signal and by current controling signal, current control circuit 4 is excessive in input voltage
When, charged using input voltage to its internal electric source to reduce the starting current of LED driver, the charging current of its internal electric source
Less and less, the starting current of LED driver is just increasing, achievees the purpose that LED driver delay startup.The LED of the present invention
Driver can realize delay startup, it is possible to prevente effectively from LED driver, because starting overtension, fever is seriously and damage is internal
Component.Voltage sampling circuit 1 gathers input voltage, and the input voltage collected is transmitted to the defeated of voltage comparator circuit 2
Enter end, reference voltage circuit 5 produces the voltage of predefined size, and the voltage of generation is transmitted to the another of voltage comparator circuit 2
A input terminal.Voltage comparator circuit 2 produces comparative result according to the input voltage of two input terminals, and comparative result is transmitted to
Control signal generation circuit 3.Control signal generation circuit 3 produces control instruction according to comparative result, and control instruction is transmitted
To current control circuit 4.Current control circuit 4 adjusts the charging current of its internal electric source according to the control instruction received.
The above, is presently preferred embodiments of the present invention, the invention is not limited in the above embodiment, as long as
It reaches the technique effect of the present invention with identical means, should all belong to protection scope of the present invention.
Claims (5)
- A kind of 1. delay startup LED driver, it is characterised in that：It is more electric including voltage sampling circuit, reference voltage circuit, voltage Road, control signal generation circuit and current control circuit, the output terminal of voltage sampling circuit and the output terminal of reference voltage circuit Two input terminals of voltage comparator circuit are connected respectively to, the output terminal of voltage comparator circuit is connected to control signal generation circuit Input terminal, the output terminal of control signal generation circuit is connected to the input terminal of current control circuit.
- A kind of 2. delay startup LED driver according to claim 1, it is characterised in that：Voltage sampling circuit collection input Voltage, and the input voltage collected is transmitted to the input terminal of voltage comparator circuit, reference voltage circuit produces predefined size Voltage, and the voltage of generation is transmitted to another input terminal of voltage comparator circuit.
- A kind of 3. delay startup LED driver according to claim 2, it is characterised in that：Voltage comparator circuit is according to two The input voltage of input terminal produces comparative result, and comparative result is transmitted to control signal generation circuit.
- A kind of 4. delay startup LED driver according to claim 3, it is characterised in that：Control signal generation circuit according to Comparative result produces control instruction, and control instruction is transmitted to current control circuit.
- A kind of 5. delay startup LED driver according to claim 4, it is characterised in that：Current control circuit is according to reception To control instruction adjust the charging current of its internal electric source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711142681.5A CN107949100A (en) | 2017-11-17 | 2017-11-17 | A kind of delay startup LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711142681.5A CN107949100A (en) | 2017-11-17 | 2017-11-17 | A kind of delay startup LED driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107949100A true CN107949100A (en) | 2018-04-20 |
Family
ID=61931669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711142681.5A Withdrawn CN107949100A (en) | 2017-11-17 | 2017-11-17 | A kind of delay startup LED driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107949100A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804793A (en) * | 2021-04-13 | 2021-05-14 | 深圳市安规科技有限公司 | Slow starting circuit and LED power supply device |
| CN112904925A (en) * | 2019-11-19 | 2021-06-04 | 杭州海康消防科技有限公司 | Load driving and protection circuit |
-
2017
- 2017-11-17 CN CN201711142681.5A patent/CN107949100A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904925A (en) * | 2019-11-19 | 2021-06-04 | 杭州海康消防科技有限公司 | Load driving and protection circuit |
| CN112804793A (en) * | 2021-04-13 | 2021-05-14 | 深圳市安规科技有限公司 | Slow starting circuit and LED power supply device |
| CN112804793B (en) * | 2021-04-13 | 2021-12-21 | 深圳市安规科技有限公司 | Slow starting circuit and LED power supply device |
| WO2022217692A1 (en) * | 2021-04-13 | 2022-10-20 | 深圳市安规科技有限公司 | Pre-charge circuit and led power supply apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180420 |
|
| WW01 | Invention patent application withdrawn after publication |