CN206975151U - Load open-circuit detection circuit - Google Patents
Load open-circuit detection circuit Download PDFInfo
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- CN206975151U CN206975151U CN201720817197.7U CN201720817197U CN206975151U CN 206975151 U CN206975151 U CN 206975151U CN 201720817197 U CN201720817197 U CN 201720817197U CN 206975151 U CN206975151 U CN 206975151U
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- load
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- diode
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Abstract
The utility model provides a kind of load open-circuit detection circuit, including switching, loading, diode, comparator, control chip, the output end of the power input termination switch of the load, the anode of the ground connection terminating diode of the load, the minus earth of the diode, the earth terminal of the load also connect the input of comparator, the input of the output termination control chip of the comparator, the control terminal of the output termination switch of the control chip, the input termination power of the switch.Device is device conventional on the market used by the utility model, and its is cheap, substantially reduces manufacturing cost, is also convenient for changing, reduces maintenance cost.
Description
Technical field
Electronic technology field is the utility model is related to, in particular, is related to a kind of load open-circuit detection circuit.
Background technology
Electrically, electronic equipment in the higher application of many security requirements, it is necessary to by switch to load carry out open and close
Control, while need to detect to whether load disconnects with control device, enter when surprisingly being disconnected with control device to load
Row alarm, makes the electric, control system of electronic equipment make corresponding treatment measures, avoids the generation of harm, therefore, load is opened
Road detection is particularly significant.
In existing load open circuit detection technique, with smart power electrical resistance collection current signal, then pass through accurate amplifier
To amplify the signal of electrical resistance collection, export and gathered to single-chip microcomputer with ADC, (as when load electricity for such centering low-power load
Flow for 100mA when, the resistive voltage ability 5mV-10mV in 50-100 milliohms), the voltage on precision resistance is very small, so to fortune
It is very high to calculate imbalance pressure regulation and the required precision of amplifier, common inexpensive amplifier can not meet at all.Cause cost waste and
Realize difficult.
The content of the invention
Technical purpose of the present utility model is to overcome that the precision of load open-circuit detection circuit in the prior art is low, manufacturing cost
High technical problem；There is provided a kind of component be easily changed, low cost, the high load open-circuit detection circuit of accuracy of detection.
To realize above technical purpose, the technical solution of the utility model is：A kind of load open-circuit detection circuit, including open
Pass, load, diode, comparator, control chip, the output end of the power input termination switch of the load, the load
The anode of terminating diode, the minus earth of the diode are grounded, the earth terminal of the load also connects the input of comparator,
The input of the output termination control chip of the comparator, the control terminal of the output termination switch of the control chip are described
The input termination power of switch.
Further, when the load number is multiple, then the power input termination one each loaded switchs, each load
Earth terminal all connect the diode of a minus earth and the input of comparator, the output end of each comparator respectively with it is described
The input connection of control chip, the output end of the control chip connect the control terminal of each switch respectively.
Further, when the load number is multiple, in addition to total main control chip, then the power input each loaded
A switch is connect, the earth terminal each loaded connects the diode of a minus earth and the input of a comparator, each comparator
Output end connect the input connection of a control chip, the output end of each control chip and each master control chip respectively
Input connects.
Further, the diode selects low voltage difference Schottky diode.
Further, load of the load from middle low power.
Further, the control chip selects MCU chip.
Load open-circuit detection circuit of the present utility model, has the advantages that：
1st, the utility model load ground connection terminate low voltage difference Schottky diode, have impedance is low, forward voltage drop is small,
The features such as resume speed is fast, for measuring the load of middle low power, it is possible to increase its accuracy and precision for measuring.
2nd, device is device conventional on the market used by the utility model, and its is cheap, substantially reduces system
This is caused, is also convenient for changing, reduces maintenance cost.
3rd, the utility model by comparator by the voltage on diode compared with reference voltage level, its principle letter
Single, component used is few, it is easy to accomplish, it is easy to integrate.
4th, the utility model uses the design of control chip, more easily expands, alarm in connection, it is possible to is to realize
Load open circuit alarm etc..
5th, the utility model can also judge whether one or more load opens a way, and its application is very wide.
The additional aspect of the utility model and advantage will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams when load of utility model is one；
Fig. 2 is the circuit theory diagrams when load of utility model is multiple；
Fig. 3 is another circuit theory diagrams when the load of utility model is multiple；
In figure, 1- loads, 2- comparators, 3- control chips, D- diodes, S- switches.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
In one embodiment of the present utility model, as shown in figure 1, a kind of load open-circuit detection circuit, including switch S, bear
1, diode D, comparator 2, control chip 3 are carried, loads 1 power input termination switch S output end, loads 1 earth terminal
Connect diode D anode, diode D minus earth, the earth terminal for loading 1 also connects the input of comparator 2, comparator 2
The input of output termination control chip 3, the output termination of control chip 3 switch S control terminal, switch S input termination electricity
Source VCC.
Operation principle：Reference voltage on comparator is set first, inputs to export high level during 0V, inputs as 0.2-
During 0.3V, export as low level；When normal operation is not opened a way in load, diode D will be turned on, and produce a 0.2-0.3V above
Forward voltage, the forward voltage signal inputs to comparator, comparator by the forward voltage compared with reference voltage level,
Low level is exported, and low level is transferred to main control chip, then main control chip judges load for normal operation of not opening a way；Work as load
Diode D will be not turned on during open circuit, and the voltage on diode D is 0V, and the voltage signal inputs to comparator, and comparator is by the electricity
Press signal to export high level compared with reference voltage level, and high level is transferred to main control chip, then main control chip judges
Load to open a way, main control chip can be with the state of controlling switch, and then controls the working condition of load.
In another embodiment of the present utility model, as shown in Fig. 2 a kind of quantity of load 1 of load open-circuit detection circuit
For it is multiple when, then the switch S of power input termination one of each load 1, the earth terminal of each load 1 connects the two of a minus earth
Pole pipe D and comparator 2 input, the output end of each comparator 2 are connected with the input of control chip respectively, control core
The output end of piece connects the control terminal of each switch respectively.
Operation principle：Reference voltage on comparator is set first, inputs to export high level during 0V, inputs as 0.2-
During 0.3V, export as low level；The voltage of each diode, which exports, gives its corresponding comparator, and will be inputted by the comparator
Voltage signal be transferred to main control chip compared with reference voltage level, and by the high level of output or low level；When this ratio
Compared with device output be high level when, then main control chip judges load open circuit corresponding to the comparator；When comparator output is low electricity
Usually, then main control chip judges to load normal operation of not opening a way corresponding to the comparator；It is finally each negative by main control chip output
The working condition of load, main control chip can also be by controlling the state each switched, and then controls the working condition each loaded.
In another embodiment of the present utility model, as shown in figure 3, a kind of quantity of load 1 of load open-circuit detection circuit
For it is multiple when, in addition to total main control chip 4, then the switch S of power input termination one of each load 1, the earth terminal of each load 1
The diode D of a minus earth and the input of a comparator 2 are all met, the output end of each comparator 2 connects a control core respectively
The input connection of piece 3, the output end of each control chip 3 are connected with the input of master control chip 4.
Operation principle：Reference voltage on comparator is set first, inputs to export high level during 0V, inputs as 0.2-
During 0.3V, export as low level；The voltage of each diode, which exports, gives its corresponding comparator, and will be inputted by the comparator
Voltage signal be transferred to its corresponding main control chip compared with reference voltage level, and by the high level of output or low level,
Output result is transferred to total main control chip by the main control chip again；When comparator output is high level, then corresponding to it
Main control chip judges load open circuit corresponding to the comparator, and result is transferred into total main control chip by the main control chip；When this
When comparator output is low level, then its corresponding main control chip judges to load normal operation of not opening a way corresponding to the comparator,
And result is transferred to total main control chip by the main control chip；The working condition finally each loaded by the output of total main control chip,
Total main control chip can also send control instruction to each main control chip, and the shape of switch corresponding to it is controlled by each main control chip
State, and then control the working condition of load corresponding to it.
In another embodiment of the present utility model, diode selects low voltage difference Schottky diode.It is low, just with impedance
To the features such as pressure drop is small, resume speed is fast, for measuring the load of middle low power, it is possible to increase its accuracy and essence for measuring
Degree.
In another embodiment of the present utility model, the load of middle low power is selected in load, and the circuit is applied to medium and small work(
The load of rate, its accuracy of detection are high.
In another embodiment of the present utility model, control chip selects MCU chip, can also select other control cores
Piece.
In another embodiment of the present utility model, control chip can also be connected with alarm, display etc., by function
Expanded, being connected with alarm can realize that load open circuit is alarmed, and the work each loaded can be shown by being connected with display
State, judges whether one or more load opens a way, and its application is very wide.
Device is device conventional on the market used by the utility model, and its is cheap, substantially reduces manufacture
Cost, it is also convenient for changing, reduces maintenance cost.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as not departing from the utility model to limitation of the present utility model, one of ordinary skill in the art
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.The scope of the utility model is extremely equally limited by appended claims.
Claims (6)
- A kind of 1. load open-circuit detection circuit, it is characterised in that：Including switching, loading, diode, comparator, control chip, institute State load power input termination switch output end, the load ground connection terminating diode anode, the diode Minus earth, the earth terminal of the load also connect the input of comparator, and the output of the comparator terminates the defeated of control chip Enter end, the control terminal of the output termination switch of the control chip, the input termination power of the switch.
- 2. load open-circuit detection circuit as claimed in claim 1, it is characterised in that：When the load number is multiple, then often Individual load power input termination one switch, the earth terminal each loaded connect a minus earth diode and comparator it is defeated Enter end, the input of the output end of each comparator respectively with the control chip is connected, the output end of the control chip The control terminal of each switch is connect respectively.
- 3. load open-circuit detection circuit as claimed in claim 1, it is characterised in that：When the load number is multiple, also wrap Total main control chip is included, then the switch of power input termination one each loaded, the earth terminal each loaded connects a minus earth The input of diode and a comparator, the output end of each comparator connect the input connection of a control chip respectively, each Input of the output end of control chip all with each master control chip is connected.
- 4. load open-circuit detection circuit as claimed in claim 1 or 2, it is characterised in that：The diode selects low voltage difference Xiao Special based diode.
- 5. load open-circuit detection circuit as claimed in claim 1 or 2, it is characterised in that：The load is from middle low power Load.
- 6. load open-circuit detection circuit as claimed in claim 1, it is characterised in that：The control chip selects MCU chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720817197.7U CN206975151U (en) | 2017-07-07 | 2017-07-07 | Load open-circuit detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720817197.7U CN206975151U (en) | 2017-07-07 | 2017-07-07 | Load open-circuit detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206975151U true CN206975151U (en) | 2018-02-06 |
Family
ID=61406774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720817197.7U Active CN206975151U (en) | 2017-07-07 | 2017-07-07 | Load open-circuit detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206975151U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157875A (en) * | 2019-12-31 | 2020-05-15 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN112269149A (en) * | 2020-10-16 | 2021-01-26 | 深圳市沃特沃德股份有限公司 | Micro-current load open circuit detection circuit and terminal equipment |
-
2017
- 2017-07-07 CN CN201720817197.7U patent/CN206975151U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157875A (en) * | 2019-12-31 | 2020-05-15 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN111157875B (en) * | 2019-12-31 | 2021-11-02 | 西安翔腾微电子科技有限公司 | Open-state load open-circuit detection circuit and method |
| CN112269149A (en) * | 2020-10-16 | 2021-01-26 | 深圳市沃特沃德股份有限公司 | Micro-current load open circuit detection circuit and terminal equipment |
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