CN207968313U - Driving circuit - Google Patents
Driving circuit Download PDFInfo
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- CN207968313U CN207968313U CN201820466147.3U CN201820466147U CN207968313U CN 207968313 U CN207968313 U CN 207968313U CN 201820466147 U CN201820466147 U CN 201820466147U CN 207968313 U CN207968313 U CN 207968313U
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- capacitance
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- voltage
- current source
- voltage detecting
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- 238000001514 detection method Methods 0.000 abstract description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 6
- 208000033999 Device damage Diseases 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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Abstract
The utility model provides a drive circuit, include: the driving chip is integrated with a voltage comparator and a current source, the input end of the voltage comparator is connected to a voltage detection point, and the output end of the current source is connected between the voltage comparator and the voltage detection point; one end of the first capacitor is connected between the output end of the current source and the voltage detection point, and the other end of the first capacitor is grounded; the anode of the first diode is connected with the first capacitor, and the cathode of the first diode is connected with the voltage detection point; and a filter circuit and a clamping circuit are connected between the first capacitor and the first diode, and under the abnormal condition, the driving chip outputs a control signal to close the controlled device so as to protect the device.
Description
Technical field
The utility model is related to automobile circuit field more particularly to a kind of driving circuits.
Background technology
Current source has been widely used in vehicle electric field, is and power supply is all two signal of interest in analog circuit
Source, current source are often encapsulated in inside driving chip with other devices, because having the characteristics that constant output current with reality together
Now to the drive control of controlled device.
But in practical application, in abnormal cases due to controlled device, it is controlled the voltage meeting of the voltage detecting point of device
Mutation tends not to realize the effective protection control to being controlled device well at this time, causes device damage.
Utility model content
The utility model embodiment provides a kind of driving circuit, in abnormal cases cannot be well to solve controlled device
Realize the problem of controlling to the effective protection for being controlled device, cause device damage.
In order to solve the above-mentioned technical problem, the utility model is realized in this way：
The utility model embodiment provides a kind of driving circuit, including：
Driving chip is integrated with voltage comparator and current source, the input of the voltage comparator on the driving chip
End is connected to a voltage detecting point, the output end of the current source be connected to the voltage comparator and the voltage detecting point it
Between；
First capacitance, one end are connected between the output end of the current source and the voltage detecting point, other end ground connection；
First diode, positive and first capacitance connection, cathode are connected to the voltage detecting point；
It is connected with filter circuit and clamp circuit between first capacitance and first diode.
Wherein, the filter circuit includes：
First resistor, one end are connected between first capacitance and first diode, and the other end is connected to an electricity
Source；
Second capacitance, one end are connected between first capacitance and first diode, the other end and described first
The ground terminal of capacitance connects, wherein the capacitance of second capacitance is more than the capacitance of first capacitance.
Wherein, the clamp circuit includes：Second diode, anode are connected to second capacitance and the one or two pole
Between pipe, cathode is connected to the power supply；
Third diode, the positive ground terminal with first capacitance are connect, and cathode is connected to second diode
Anode.
Wherein, the filter circuit further includes：With the second resistance of first Diode series, the second resistance
One end is connected to the anode of first diode, and the other end is connected to the anode of second diode.
Wherein, the voltage detecting point is the collector of a triode.
In the utility model embodiment, in abnormal cases, driving chip output control signal is realized to being controlled device
Closing, realize protection to it, wherein be connected with filter circuit between the first capacitance and the first diode and reduce the one or two pole
False triggering caused by pipe reverse characteristic and be connected between first capacitance and the first diode clamp circuit carry out clamper limit
Width realizes reasonable effective drive control of the driving circuit to controlled device.
Description of the drawings
Fig. 1 shows a kind of circuit diagrams of driving circuit in the utility model embodiment.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that described embodiment is the utility model a part of the embodiment, rather than whole implementation
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
A kind of driving circuit is disclosed in the utility model embodiment, in conjunction with shown in Fig. 1, including：
Driving chip, is integrated with voltage comparator B and current source A on the driving chip, the voltage comparator B it is defeated
Enter end and be connected to a voltage detecting point, the output end of the current source A is connected to the voltage comparator B and the voltage detecting
Between point；
First capacitance D, one end are connected between the output end and the voltage detecting point of the current source A, another termination
Ground；
First diode C, positive to be connect with the first capacitance D, cathode is connected to the voltage detecting point；
It is connected with filter circuit and clamp circuit between the first capacitance D and the first diode C.
In the circuit, voltage detecting point is a position in controlled device, by being formed by voltage inspection to the position
The detection of voltage on measuring point, and then realize the drive control to being controlled device.
Wherein, driving chip realizes the detection to external test point voltage, is realized specifically by voltage comparator B,
The input terminal of voltage comparator B is connected to voltage detecting point, the voltage of the test point is compared with load voltage value, foundation
Comparison result realizes drive control of the driving chip to controlled device.
When the voltage when voltage detecting end is in a smaller value, and test point is low level, circuit balancing, current source A's
Electric current flows through the voltage detecting point that the first diode C flow directions are controlled device, when abnormal, voltage change at test point occurs in controlled device
Height, when being more than the rated voltage of comparator B, the first diode C reversely ends, current direction the first capacitance D of current source A, when
When the voltage of first one end capacitance D is increased to setting value, driving chip output control signal realizes the closing to being controlled device, real
Now to its protection, wherein it is reversed to be connected with the first diode C of filter circuit reduction between the first capacitance D and the first diode C
It false triggering caused by characteristic and it is connected with clamp circuit between the first capacitance D and the first diode C carries out clamper amplitude limit, it is real
Reasonable effective drive control of the existing driving circuit to controlled device.
Preferably, which is the collector of a triode, which is formed as the controlled device.
Wherein, which includes：First resistor, one end are connected to the first capacitance D and the first diode C
Between, the other end is connected to a power supply；Second capacitance, one end be connected to the first capacitance D and the first diode C it
Between, the other end is connect with the ground terminal of the first capacitance D, wherein the capacitance of second capacitance is more than first electricity
Hold the capacitance of D.
Wherein, which includes：Second diode, anode are connected to second capacitance and first diode
Between C, cathode is connected to the power supply；Third diode, the positive ground terminal with the first capacitance D are connect, cathode connection
To the anode of second diode.
Specifically, which further includes：With the concatenated second resistances of the first diode C, the second resistance
One end be connected to the anode of the first diode C, the other end is connected to the anode of second diode.
In foregoing circuit, a resistance is added on the first diode C circuits, has caused to reduce diode reverse characteristic
False triggering, a first resistor pull-up resistor and filter capacitor for being connected to power supply is added, and pass through the second diode and the
Three diodes carry out clamper amplitude limit, and when voltage detecting point is low level, circuit balancing, electric current can all pass through the first diode C
Flow detection point, when there is interference to generate, because adding the second capacitance that a capacitance is more than the first capacitance D in circuit
(matching and debugging that capacitance can be carried out according to circuit interference strength) is compared with the first capacitance D of script, is filtered and anti-interference
Ability improves, and will not produce misleading.When voltage detecting point voltage, which increases, is more than setting voltage value, current source A and power supply meeting
While the first capacitance D, the second capacitance progress sink current are given respectively, the output end of voltage comparator B is connected to one in driving chip
Logical device, the voltage comparator B driving logical device work after two capacitance voltages reach aforementioned setting voltage value so that drive
Dynamic chip realizes the drive control to being controlled device.
Wherein it is preferred to which this sets voltage value as 8V, the capacitance of supply voltage 15V, the first capacitance D are 100pf,
The capacitance of second capacitance is 1nf, and the output current of current source A is 250ua, and the resistance value of second resistance is 2k Ω.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that process, method, article or device including a series of elements include not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including this
There is also other identical elements in the process of element, method, article or device.
Above-described is preferred embodiments of the present invention, it should be pointed out that for the ordinary person of the art
For, it can also make several improvements and retouch under the premise of not departing from principle described in the utility model, these are improved and profit
Decorations are also within the protection scope of the present utility model.
Claims (5)
1. a kind of driving circuit, which is characterized in that including：
Driving chip, voltage comparator and current source are integrated on the driving chip, and the input terminal of the voltage comparator connects
It is connected to a voltage detecting point, the output end of the current source is connected between the voltage comparator and the voltage detecting point；
First capacitance, one end are connected between the output end of the current source and the voltage detecting point, other end ground connection；
First diode, positive and first capacitance connection, cathode are connected to the voltage detecting point；
It is connected with filter circuit and clamp circuit between first capacitance and first diode.
2. driving circuit according to claim 1, which is characterized in that the filter circuit includes：
First resistor, one end are connected between first capacitance and first diode, and the other end is connected to a power supply；
Second capacitance, one end are connected between first capacitance and first diode, the other end and first capacitance
Ground terminal connection, wherein the capacitance of second capacitance be more than first capacitance capacitance.
3. driving circuit according to claim 2, which is characterized in that the clamp circuit includes：
Second diode, anode are connected between second capacitance and first diode, and cathode is connected to the power supply；
Third diode, the positive ground terminal with first capacitance are connect, and cathode is connected to the anode of second diode.
4. driving circuit according to claim 3, which is characterized in that the filter circuit further includes：
It is being connected to first diode just with one end of the second resistance of first Diode series, the second resistance
Pole, the other end are connected to the anode of second diode.
5. driving circuit according to claim 1, which is characterized in that the voltage detecting point is the current collection of a triode
Pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820466147.3U CN207968313U (en) | 2018-03-30 | 2018-03-30 | Driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820466147.3U CN207968313U (en) | 2018-03-30 | 2018-03-30 | Driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207968313U true CN207968313U (en) | 2018-10-12 |
Family
ID=63726911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820466147.3U Expired - Fee Related CN207968313U (en) | 2018-03-30 | 2018-03-30 | Driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207968313U (en) |
-
2018
- 2018-03-30 CN CN201820466147.3U patent/CN207968313U/en not_active Expired - Fee Related
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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: 20181012 Termination date: 20210330 |