CN207200258U - A kind of protection circuit of LED illumination - Google Patents
A kind of protection circuit of LED illumination Download PDFInfo
- Publication number
- CN207200258U CN207200258U CN201720932106.4U CN201720932106U CN207200258U CN 207200258 U CN207200258 U CN 207200258U CN 201720932106 U CN201720932106 U CN 201720932106U CN 207200258 U CN207200258 U CN 207200258U
- Authority
- CN
- China
- Prior art keywords
- switch pipe
- protection circuit
- led illumination
- electrically connected
- diode
- Prior art date
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a kind of protection circuit of LED illumination; it is electrically connected between the pulse power and load; it includes delay circuit, first switch pipe and rapidly switches off circuit successively from input stage to output stage; rapidly switching off circuit includes speed-up capacitor and second switch pipe; speed-up capacitor one end is electrically connected with the pulse power; the other end of speed-up capacitor is electrically connected with the control terminal of second switch pipe; the input of second switch pipe is electrically connected with the output end of first switch pipe, and the output end of second switch pipe is electrically connected with the control terminal of first switch pipe.The utility model realizes rapidly switching off for first switch pipe when negative pulse or micro cut, by speed-up capacitor and second switch pipe, avoids harmful effect of the negative potential to load end.
Description
Technical field
Circuit protection technical field is the utility model is related to, particularly a kind of protection circuit of LED illumination.
Background technology
Input protection module for vehicle-mounted electronic control unit, in the case of high current, usually using flash PMOS
As anti-reverse protection.For such input protection module, if there is negative voltage pulse in input（Referring to ISO7637
Pulse1）Or u-cut shorted to earths, when testing, PMOS shut-off has the delay of certain time, turn-off delay time by
PMOS grid source resistance-capacitance network parameter determines.Just because of the presence of this section of time delay, cause negative voltage pulse in peak value
When by PMOS, if back end of line does not have clamper, negative electricity compression can be brought to back end of line.If enter in input
Row u-cut is tested, the direct shorted to earth of input, then the storage capacitor of back-end circuit can by the PMOS that opens rapidly electric discharge and
The grade needed for test can not be reached.So although counnter attack protection MOSFET when negative pulse or u-cut,
The voltage stress for being delayed to turn off reducing MOS of MOSFET short time, but for the route protection of input protection module rear end
It is just not effective enough.
As shown in figure 1, belonging to prior art is used for LED illumination System, the V-BAT ends under the conditions of negative pulse are, it is necessary to the greatest extent
Circuit turns off Q1 below for fast protection（PMOS）.The circuit structure being illustrated in figure 2 after improving, Q1 become NMOS, but Q1 is opened
Pass is still in the presence of delay, and this can not meet the normal operation in illuminator.
Utility model content
The technical problems to be solved in the utility model is to be directed to above-mentioned the deficiencies in the prior art, there is provided a kind of LED illumination
Protection circuit.
In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of protection electricity of LED illumination
Road, it is electrically connected between the pulse power and load, it includes delay circuit, first switch pipe successively from input stage to output stage
With rapidly switch off circuit, the circuit that rapidly switches off includes speed-up capacitor and second switch pipe, described speed-up capacitor one end and arteries and veins
Power supply electric connection is rushed, the other end of speed-up capacitor is electrically connected with the control terminal of second switch pipe, the input of second switch pipe
End and the output end of first switch pipe are electrically connected with, and the output end of second switch pipe electrically connects with the control terminal of first switch pipe
Connect.
In above-mentioned technical proposal, between the output end and control terminal of the first switch pipe or input and control terminal it
Between and be connected to the first protection circuit, first protection circuit includes electric capacity parallel with one another, resistance and diode.
In above-mentioned technical proposal, the second switch pipe includes at least one switching tube.
In above-mentioned technical proposal, between the output end and control terminal of the second switch pipe or input and control terminal it
Between and be connected to the second protection circuit, second protection circuit includes electric capacity parallel with one another, resistance and diode.
In above-mentioned technical proposal, the switching tube is triode.
In above-mentioned technical proposal, the input of the switching tube is all serially connected with current-limiting resistance.
In above-mentioned technical proposal, the first switch pipe is p-type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
In above-mentioned technical proposal, be serially connected with diode between the pulse power and speed-up capacitor, the positive pole of diode with
Speed-up capacitor is electrically connected with, and negative pole and the pulse power of diode are electrically connected with.
In above-mentioned technical proposal, overvoltage crowbar is also associated with before the first switch pipe, overvoltage protection electricity
Road includes two voltage-regulator diodes of differential concatenation.
In above-mentioned technical proposal, accumulator is additionally provided with the output stage, the accumulator includes diode, electric capacity
And resistance.
The beneficial effects of the utility model are：It can be carried out in the case of negative pulse and micro-cut to follow-up circuit
Protection, by effect of the speed-up capacitor to triode, quick closedown first switch pipe Q1, VOUT ends negative electricity is not occurred
Position, efficiently avoid influence of the negative potential to load.
Brief description of the drawings
Fig. 1 is the circuit theory schematic diagram of the utility model prior art one；
Fig. 2 is the circuit theory schematic diagram for the prior art two that the utility model is improved to prior art one；
Fig. 3 is the circuit theory schematic diagram of the utility model embodiment one；
Fig. 4 is the circuit theory schematic diagram of the utility model embodiment two；
Fig. 5 is the chart of the utility model embodiment two（Pulse 1b）；
Fig. 6 is the chart of the utility model embodiment two（micro-cut）；
Fig. 7 is the circuit theory schematic diagram of the utility model embodiment three.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
A kind of protection circuit of LED illumination, it is electrically connected between the pulse power and load, it is from input stage to output stage
Include delay circuit, first switch pipe successively and rapidly switch off circuit, the circuit that rapidly switches off includes speed-up capacitor and second
Switching tube, described speed-up capacitor one end are electrically connected with the pulse power, the other end of speed-up capacitor and the control of second switch pipe
End is electrically connected with, and the input of second switch pipe is electrically connected with the output end of first switch pipe, the output end of second switch pipe
It is electrically connected with the control terminal of first switch pipe.
Wherein, between the output end and control terminal of the first switch pipe or between input and control terminal and it is connected to
One protection circuit, first protection circuit include electric capacity parallel with one another, resistance and diode.
Wherein, the second switch pipe includes at least one switching tube.The output end and control terminal of the second switch pipe
Between or input and control terminal between and be connected to the second protection circuit, second protection circuit includes electricity parallel with one another
Appearance, resistance and diode.The switching tube is triode.The input of the switching tube is all serially connected with current-limiting resistance.
Wherein, the first switch pipe is p-type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
Wherein, diode, positive pole and the speed-up capacitor electricity of diode are serially connected between the pulse power and speed-up capacitor
Property connection, the negative pole of diode is electrically connected with the pulse power.
Wherein, overvoltage crowbar is also associated with before the first switch pipe, the overvoltage crowbar includes reverse
Two voltage-regulator diodes of series connection.
Wherein, accumulator is additionally provided with the output stage, the accumulator includes diode, electric capacity and resistance.
Embodiment one as shown in Figure 3：
V-BAT termination powers, GND ends ground connection.Delay circuit is parallel to V-BAT ends and GND by electric capacity C1, C2 and resistance R1
Formed between end.First switch pipe Q1 uses p-type metal-oxide-semiconductor, and first switch pipe Q1 source electrode and V-BAT ends are electrically connected with, and first
Resistance R2, first switch pipe Q1 drain electrode and VOUT ends are serially connected between switching tube Q1 grid and GND ends（Load end）Electrically
Connection, and diode D2 is serially connected between first switch pipe Q1 drain electrode and GND ends, grid and leakage in first switch pipe Q1
Between pole and it is connected to the first protection circuit being made up of electric capacity C3, voltage-regulator diode D1 and resistance R3.Second switch Guan Yousan poles
Pipe Q2, triode Q3, electric capacity C4, electric capacity C5, diode D3, diode D4, resistance R4, resistance R5, resistance R8, resistance R9 groups
Into, resistance 5, which is connected between triode Q2 base stage and triode Q3 collector, is used as current limliting, triode Q2 base stage and emitter-base bandgap grading it
Between and be connected to the second protection circuit being made up of electric capacity C4, voltage-regulator diode D3 and resistance R4, triode Q3 base stage and emitter-base bandgap grading
Between and be connected to the 3rd protection circuit being made up of electric capacity C5, voltage-regulator diode D4 and resistance R9, resistance R8 is connected to triode Q3
Base stage and speed-up capacitor C5 one end between, the speed-up capacitor C5 other end and V-BAT ends.Resistance R6 and resistance R7 group compositions
Pressure network network, triode Q3 emitter-base bandgap grading are connected to the node between resistance R6 and resistance R7, triode Q2 collector and first switch pipe
Q1 drain electrode is electrically connected with, and triode Q2 emitter-base bandgap grading is electrically connected with first switch pipe Q1 grid.Wherein C5 pairs of speed-up capacitor
Voltage is detected, and when cell voltage negative sense changes, because speed-up capacitor C5 both end voltages can not be mutated, causes triode Q3
Base voltage is pulled low, and triode Q3 conductings, then triode Q2 base stage is connected with VOUT ends, and triode Q2 is also switched on, i.e.,
First switch pipe Q1 coral source electrode causes first switch pipe Q1 to turn off by triode Q2 short circuits.Similarly it is also applied for N-type MOS
The protection circuit of pipe, line connecting method is consistent, is connected across the grid source electrode of N-type metal-oxide-semiconductor.
Embodiment two as shown in Figure 4：
V-BAT termination powers, GND ends ground connection.Delay circuit is parallel to V-BAT ends and GND ends by electric capacity C1 and resistance R1
Between form.The overvoltage protection electricity being made up of the two voltage-regulator diode Tj reversely concatenated is gone back and is connected between V-BAT ends and GND ends
Road.First switch pipe Q1 uses p-type metal-oxide-semiconductor, and first switch pipe Q1 source electrode and V-BAT ends are electrically connected with, first switch pipe Q1
Grid and GND ends between be serially connected with resistance R2, first switch pipe Q1 drain electrode and VOUT ends（Load end）It is electrically connected with, and
Draining for first switch pipe Q1 is serially connected with the accumulator being made up of diode D3, resistance R9 and electric capacity C5 between GND ends, and two
Pole pipe D3 connects with electric capacity C5, and resistance R9 is in parallel with electric capacity C5；Between first switch pipe Q1 grid and drain electrode and be connected to by
Electric capacity C2, voltage-regulator diode D2 and resistance R3 compositions the first protection circuit.Second switch pipe is by resistance R4, resistance R5, resistance
R7, resistance R8, speed-up capacitor C3, diode D4 and triode Q2, resistance R4 are connected to first switch pipe Q1 grid, three poles respectively
Pipe Q2 collector, the current limliting as first switch pipe Q1；Base stage after the series resistor R7 of V-BAT ends with triode is electrically connected with；
The diode D4, resistance R5 and the resistance R8 that successively include reversal connection in parallel with resistance R7, wherein speed-up capacitor C3 and resistance R5 are simultaneously
Connection.Between triode Q2 emitter-base bandgap grading and base stage and be connected to by electric capacity C4, resistance R6 and reversal connection diode D1 form second protect
Protection circuit.When V-BAT ends are positive voltages in opereating specification, then first switch pipe Q1 is conducting, and the voltage at VOUT ends is suitable
Voltage in V-BAT ends；When negative pulse occurs in V-BAT, triode Q2 is in the conduction state, and first switch pipe Q1 ends rapidly.
Operation principle：Under normal circumstances, output voltage is not interfered with；The voltage of triode Q2 base stages is equal to V-BAT ends, so three poles
Pipe Q2 ends, and then no longer influences first switch pipe Q1；If negative pulse（Pulse 1b, 3b, micro-cut）, first switch pipe
Q1 will be closed；When there is negative pulse, the voltage jump at V-BAT ends is to bearing, and due to speed-up capacitor C3, triode Q2 will be led quickly
Logical, electric capacity C2 electric discharges, first switch pipe Q1 V-gs will be limited to low-voltage, so first switch pipe Q1 can turn off quickly.
Voltage output if Fig. 5 is negative pulse 1b shows chart.The voltage output that Fig. 6 is micro-cut shows chart.Can
To find out when there is negative pulse, first switch pipe Q1 is turned off quickly, voltage output is kept positive.
Embodiment three as shown in Figure 7, on the basis of Fig. 4 circuits, first switch pipe Q1 p-type metal-oxide-semiconductor is replaced by N
Type metal-oxide-semiconductor, and triode Q3, resistance R10, electric capacity 6 and diode D5 are added in second switch pipe, it can equally realize fast
Speed shut-off first switch pipe Q1.Concrete structure will not be repeated here as shown in circuit diagram.
Embodiment above simply indicates that rather than limited the utility model, therefore all according to the utility model patent application
The equivalent change or modification that method described in scope is done, it is included in the utility model patent application range.
Claims (10)
1. a kind of protection circuit of LED illumination, it is electrically connected between the pulse power and load, it is characterised in that：From input stage
Include delay circuit, first switch pipe successively to output stage and rapidly switch off circuit, the circuit that rapidly switches off includes accelerating electricity
Hold and second switch pipe, described speed-up capacitor one end are electrically connected with the pulse power, the other end and second switch of speed-up capacitor
The control terminal of pipe is electrically connected with, and the input of second switch pipe is electrically connected with the output end of first switch pipe, second switch pipe
The control terminal of output end and first switch pipe be electrically connected with.
A kind of 2. protection circuit of LED illumination according to claim 1, it is characterised in that：The first switch pipe it is defeated
Go out and hold between control terminal or between input and control terminal and be connected to the first protection circuit, first protection circuit includes phase
Mutually electric capacity, resistance and diode in parallel.
A kind of 3. protection circuit of LED illumination according to claim 1, it is characterised in that：The second switch pipe includes
At least one switching tube.
A kind of 4. protection circuit of LED illumination according to claim 3, it is characterised in that：The second switch pipe it is defeated
Go out and hold between control terminal or between input and control terminal and be connected to the second protection circuit, second protection circuit includes phase
Mutually electric capacity, resistance and diode in parallel.
A kind of 5. protection circuit of LED illumination according to claim 3 or 4, it is characterised in that：The switching tube is three poles
Pipe.
A kind of 6. protection circuit of LED illumination according to claim 5, it is characterised in that：The input of the switching tube
All it is serially connected with current-limiting resistance.
A kind of 7. protection circuit of LED illumination according to claim 1, it is characterised in that：The first switch pipe is p-type
Metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
A kind of 8. protection circuit of LED illumination according to claim 1, it is characterised in that：The pulse power is with accelerating
Diode is serially connected between electric capacity, positive pole and the speed-up capacitor of diode are electrically connected with, negative pole and the pulse power electricity of diode
Property connection.
A kind of 9. protection circuit of LED illumination according to claim 1, it is characterised in that：The first switch pipe it
Before be also associated with overvoltage crowbar, the overvoltage crowbar includes two voltage-regulator diodes of differential concatenation.
A kind of 10. protection circuit of LED illumination according to claim 1, it is characterised in that：Also set up in the output stage
There is accumulator, the accumulator includes diode, electric capacity and resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720932106.4U CN207200258U (en) | 2017-07-28 | 2017-07-28 | A kind of protection circuit of LED illumination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720932106.4U CN207200258U (en) | 2017-07-28 | 2017-07-28 | A kind of protection circuit of LED illumination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207200258U true CN207200258U (en) | 2018-04-06 |
Family
ID=61799117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720932106.4U Expired - Fee Related CN207200258U (en) | 2017-07-28 | 2017-07-28 | A kind of protection circuit of LED illumination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207200258U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370121A (en) * | 2017-07-28 | 2017-11-21 | 法雷奥汽车内部控制（深圳）有限公司 | A kind of protection circuit of LED illumination |
| CN109713657A (en) * | 2019-01-28 | 2019-05-03 | 上海海得控制系统股份有限公司 | A kind of protection circuit based on PLC transistor output module |
-
2017
- 2017-07-28 CN CN201720932106.4U patent/CN207200258U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370121A (en) * | 2017-07-28 | 2017-11-21 | 法雷奥汽车内部控制（深圳）有限公司 | A kind of protection circuit of LED illumination |
| CN109713657A (en) * | 2019-01-28 | 2019-05-03 | 上海海得控制系统股份有限公司 | A kind of protection circuit based on PLC transistor output module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20180406 Termination date: 20190728 |