CN105372552B - A kind of load open-circuit detection circuit and method for high side switches - Google Patents
A kind of load open-circuit detection circuit and method for high side switches Download PDFInfo
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- CN105372552B CN105372552B CN201510915406.7A CN201510915406A CN105372552B CN 105372552 B CN105372552 B CN 105372552B CN 201510915406 A CN201510915406 A CN 201510915406A CN 105372552 B CN105372552 B CN 105372552B
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000004065 semiconductor Substances 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a kind of load open-circuit detection circuits and method for high side switches, circuit includes voltage comparator, voltage collection circuit, current source, detection resistance and threshold set circuit, current source is connected in parallel on the both ends of high side switches to be detected, high side switches to be detected are in series with load, detection resistance and current source, high side switches to be detected connect jointly, and tie point is connected with the input terminal of voltage collection circuit, the output end of voltage collection circuit and the reverse input end of voltage comparator are to connection, threshold set circuit is connected with the positive input of voltage comparator, output end of the output end of voltage comparator as load open-circuit detection circuit, for output loading open fault signal.The present invention is realized by common discrete semi-conductor electronic device, can be suitable for different supply voltages according to use condition adjusting parameter, be can adjust detection sensitivity, circuit is simple, easy to implement, has a good application prospect.
Description
Technical field
The present invention relates to electrical, electronic equipment control technology fields, and in particular to a kind of load for high side switches is opened
Alignment detection circuit and method.
Background technology
Electrically, electronic equipment needs to carry out load by high side switches in the higher application of many security requirements
Open and close control, while needing to be detected to whether load disconnects with control device, are surprisingly disconnected with control device to load
Shi Jinhang alarms, and so that electrical, electronic equipment control system is made corresponding treatment measures, avoids the generation of harm, therefore, high
The load open circuit detection of side switch control is particularly significant.
The load open circuit detection of high side switches control depends on the integrated circuit being arranged in high side switches and realizes, but
It is that current integrated circuit is produced by semiconductor maker, only adapts in low-voltage direct application, in the relatively high field of voltage
Conjunction can not apply, and how solve the above problems, current urgent problem.
Invention content
Integrated circuit is only fitted in the load open circuit detection of the existing high side switches control of technical problem solved by the invention
It should be in low-voltage direct application, the problem of the relatively high occasion of voltage can not be applied.The present invention for high side switches
Load open-circuit detection circuit is realized by common discrete semi-conductor electronic device, can be fitted according to use condition adjusting parameter
For different supply voltages, detection sensitivity is can adjust, circuit is simple, easy to implement, has a good application prospect
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of load open-circuit detection circuit for high side switches, it is characterised in that：Including voltage comparator, voltage acquisition
Circuit, current source, detection resistance and threshold set circuit, the current source are connected in parallel on the both ends of high side switches to be detected, institute
High side switches to be detected to be stated to be in series with load, the detection resistance is connect jointly with current source, high side switches to be detected,
And tie point is connected with the input terminal of voltage collection circuit, the output end of the voltage collection circuit and voltage comparator it is anti-
To input terminal to connection, the threshold set circuit is connected with the positive input of voltage comparator, the voltage comparator
Output end as load open-circuit detection circuit output end, be used for output loading open fault signal.
It is previously described for the load open-circuit detection circuit of high side switches, it is characterised in that：The high side switches to be detected
For mechanical contact switch or contactless semiconductor switch,
It is previously described for the load open-circuit detection circuit of high side switches, it is characterised in that：The high side switches to be detected
For contactless semiconductor switch, then the leakage current of semiconductor switch is used to substitute current source.
It is previously described for the load open-circuit detection circuit of high side switches, it is characterised in that：The threshold set circuit setting
Detection threshold value Vref=i × R1 (1-t%) or Vref=i × (R1//R2) × (1+t%), wherein i is current source
Output current value, R1 are the resistance value of detection resistance, and R2 is the resistance value of load, and t% is the range of tolerable variance of threshold set circuit.
Based on the load open circuit detection method of the above-mentioned load open-circuit detection circuit for high side switches, feature exists
In：Include the following steps,
Step (1), the real-time acquisition testing resistance of voltage collection circuit are connect jointly with current source, high side switches to be detected
The voltage value of point, and by output voltage to the reverse input end of voltage comparator；
Step (2), the detection threshold value Vref, Vref=i × R1 (1-t%) or Vref=i of given threshold initialization circuit
× (R1//R2) × (1+t%), threshold set circuit export positive inputs of the detection threshold value Vref to voltage comparator；
Step (3), when voltage comparator reverse input end voltage be more than i × R1 (1-t%), or less than i × (R1//
When R2) × (1+t%), voltage comparator output loading open fault signal.
It is previously described for the load open circuit detection method of the load open-circuit detection circuit of high side switches, it is characterised in that：Step
Suddenly the real-time acquisition testing resistance of (1) voltage collection circuit and current source, the voltage value of high side switches common connecting point to be detected,
Process is as follows,
(1) high side switches when it is disconnected, if with high side switches it is concatenated load do not disconnect, voltage collection circuit
Output voltage Vs1=i × (R1//R2), wherein i is the output current value of current source, and R1 is the resistance value of detection resistance, and R2 is negative
The resistance value of load；
(2) if disconnected with the concatenated load of high side switches, the resistance value R2 of load tends to be infinitely great, and at this time, voltage is adopted
Output voltage Vs2=i × R1 of collector.
The beneficial effects of the invention are as follows：The load open-circuit detection circuit and method for high side switches of the present invention, passes through
Common discrete semi-conductor electronic device is realized, can be suitable for different supply voltages according to use condition adjusting parameter, can
Detection sensitivity is adjusted, circuit is simple, easy to implement, is suitable for the occasion of various high side switches supply voltages, has good
Application prospect.
Description of the drawings
Fig. 1 is the system block diagram of the load open-circuit detection circuit for high side switches of the present invention.
Specific implementation mode
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, the load open-circuit detection circuit for high side switches of the present invention, including voltage comparator 1, voltage
Acquisition Circuit 2, current source 3, detection resistance 6 and threshold set circuit 7, the current source 3 are connected in parallel on high side switches 4 to be detected
Both ends, the high side switches 4 to be detected 5 are in series with load, the detection resistance 6 and current source 3, flash to be detected
Switch 4 connects jointly, and tie point is connected with the input terminal of voltage collection circuit 2, the output end of the voltage collection circuit 2
With the reverse input end of voltage comparator 1 to connecting, the positive input phase of the threshold set circuit 7 and voltage comparator 1
The output end of connection, the voltage comparator 1 is used for output loading open fault as the output end of load open-circuit detection circuit
Signal.
The high side switches 4 to be detected are mechanical contact switch or contactless semiconductor switch, when to be detected
High side switches 4 be contactless semiconductor switch, then use the leakage current of semiconductor switch to substitute current source 3, according to being used
High side switches 4 the case where selected for current source 3.
Detection threshold value Vref=i × the R1 (1-t%) or Vref=i that the threshold set circuit 7 is set × (R1//
R2) × (1+t%), wherein i is the output current value of current source 3, and R1 is the resistance value of detection resistance 6, and R2 is the resistance value for loading 5,
T% is the range of tolerable variance of threshold set circuit 7, and t% is the range of tolerable variance of threshold set circuit 7, and range of tolerable variance t% can be according to opening
Road accuracy of detection is chosen, generally 10% or more.
Based on the load open circuit detection method of the above-mentioned load open-circuit detection circuit for high side switches, including following step
Suddenly,
Step (1), 2 real-time acquisition testing resistance 6 of voltage collection circuit and current source 3, high side switches 4 to be detected are common
The voltage value of tie point, and by output voltage to the reverse input end of voltage comparator 1, process is as follows,
(1) high side switches 4 when it is disconnected, if with high side switches 4 it is concatenated load 5 do not disconnect when, voltage acquisition electricity
The output voltage Vs1=i on road 2 × (R1//R2), wherein i is the output current value of current source 3, and R1 is the resistance of detection resistance 6
Value, R2 are the resistance value for loading 5；
(2) if disconnected with the concatenated load of high side switches 45, the resistance value R2 for loading 5 tends to be infinitely great, at this time, voltage
Output voltage Vs2=i × R1 of Acquisition Circuit 2；
Step (2), the detection threshold value Vref, Vref=i × R1 (1-t%) or Vref=of given threshold initialization circuit 7
I × (R1//R2) × (1+t%), threshold set circuit 7 export positive inputs of the detection threshold value Vref to voltage comparator 1；
Step (3), when 1 reverse input end of voltage comparator voltage be more than i × R1 (1-t%), or less than i ×
(R1//R2) × (1+t%) when, 1 output loading open fault signal of voltage comparator.
The present invention can be according to use condition adjusting parameter (resistance value of detection resistance 6 or the detection threshold of threshold set circuit 7
Value) it is suitable for different supply voltages, and by adjusting parameter setting detection sensitivity, pass through common discrete semi-conductor electricity
Sub- device realizes that circuit is simple, easy to implement, is suitable for the occasion of various high side switches supply voltages, has good application
Foreground.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (4)
1. a kind of load open-circuit detection circuit for high side switches, it is characterised in that：It is adopted including voltage comparator (1), voltage
Collector (2), current source (3), detection resistance (6) and threshold set circuit (7), the current source (3) are connected in parallel on to be detected
The both ends of high side switches (4), the high side switches (4) to be detected are in series with load (5), the detection resistance (6) and electricity
Stream source (3), high side switches to be detected (4) connect jointly, and tie point is connected with the input terminal of voltage collection circuit (2),
The output end of the voltage collection circuit (2) and the reverse input end of voltage comparator (1) are to connecting, the threshold set circuit
(7) it is connected with the positive input of voltage comparator (1), the output end of the voltage comparator (1) is examined as load open circuit
The output end of slowdown monitoring circuit is used for output loading open fault signal；
Detection threshold value Vref=i × the R1 (1-t%) or Vref=i × (R1//R2) of threshold set circuit (7) setting
× (1+t%), wherein i is the output current value of current source (3), and R1 is the resistance value of detection resistance (6), and R2 is the resistance for loading (5)
Value, t% are the range of tolerable variance of threshold set circuit (7).
2. the load open-circuit detection circuit according to claim 1 for high side switches, it is characterised in that：It is described to be detected
High side switches (4) be mechanical contact switch or contactless semiconductor switch.
3. the load open-circuit detection circuit according to claim 2 for high side switches, it is characterised in that：It is described to be detected
High side switches (4) be contactless semiconductor switch, then use semiconductor switch leakage current substitute current source (3).
4. based on the load open circuit detection method of the load open-circuit detection circuit described in claim 1 for high side switches,
It is characterized in that：Include the following steps,
Step (1), the real-time acquisition testing resistance (6) of voltage collection circuit (2) and current source (3), high side switches to be detected (4)
The voltage value of common connecting point, and by output voltage to the reverse input end of voltage comparator (1)；
Step (2), the detection threshold value Vref, Vref=i × R1 (1-t%) or Vref=i of given threshold initialization circuit (7)
× (R1//R2) × (1+t%), threshold set circuit (7) export detection threshold value Vref and are inputted to the forward direction of voltage comparator (1)
End；
Step (3), when voltage comparator (1) reverse input end voltage be more than i × R1 (1-t%), or less than i × (R1//
When R2) × (1+t%), voltage comparator (1) output loading open fault signal,
Wherein, step (1) voltage collection circuit (2) in real time with current source (3), flash to be detected open by acquisition testing resistance (6)
The voltage value of (4) common connecting point is closed, process is as follows,
(1) high side switches (4) when it is disconnected, if do not disconnected with the concatenated load (5) of high side switches (4), voltage acquisition
The output voltage Vs1=i of circuit (2) × (R1//R2), wherein i is the output current value of current source (3), and R1 is detection resistance
(6) resistance value, R2 are the resistance value for loading (5)；
(2) if disconnected with the concatenated load (5) of high side switches (4), the resistance value R2 of load (5) tends to be infinitely great, at this time, electricity
Press output voltage Vs2=i × R1 of Acquisition Circuit (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510915406.7A CN105372552B (en) | 2015-12-10 | 2015-12-10 | A kind of load open-circuit detection circuit and method for high side switches |
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| CN201510915406.7A CN105372552B (en) | 2015-12-10 | 2015-12-10 | A kind of load open-circuit detection circuit and method for high side switches |
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| Publication Number | Publication Date |
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| CN105372552A CN105372552A (en) | 2016-03-02 |
| CN105372552B true CN105372552B (en) | 2018-09-21 |
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| US10338126B2 (en) * | 2016-04-15 | 2019-07-02 | Infineon Technologies Ag | Open load detection in output stages |
| US11489479B2 (en) * | 2017-08-03 | 2022-11-01 | Cummins Inc. | Open load diagnostics for loads that are PWM controlled |
| CN110687439B (en) * | 2018-07-06 | 2020-10-27 | 宁德时代新能源科技股份有限公司 | High-side drive switch fault detection circuit and fault detection method |
| CN110870944B (en) * | 2018-08-29 | 2024-09-27 | 景昱医疗科技（苏州）股份有限公司 | Neural stimulator and overvoltage protection method thereof |
| CN109239583A (en) * | 2018-10-22 | 2019-01-18 | 上海艾为电子技术股份有限公司 | Detect the circuit of pin floating state |
| CN111766533B (en) * | 2019-04-01 | 2021-10-01 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method |
| CN110769574B (en) * | 2019-12-04 | 2022-02-01 | 中航华东光电有限公司 | Control circuit, key and airborne display of double-color power supply indicator lamp |
| CN111092550B (en) * | 2019-12-25 | 2022-01-14 | 固德威电源科技(广德)有限公司 | Multi-path non-isolated DC/DC input open-circuit discharge control method |
| CN113640661A (en) * | 2021-08-25 | 2021-11-12 | 南京优倍电气技术有限公司 | Line fault monitoring system based on safety relay |
| CN114414913B (en) * | 2021-12-21 | 2025-05-13 | 惠州市德赛西威汽车电子股份有限公司 | A high-side load detection method for working status |
| CN114895107A (en) * | 2022-04-13 | 2022-08-12 | 无锡盛景微电子股份有限公司 | Resistance detection system and method for electronic detonator |
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| CN2814762Y (en) * | 2005-03-17 | 2006-09-06 | 重庆汇力汽车电子仪表有限公司 | Vehicle load electric control switch with short-circuit and open-circuit predetection |
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