CN105372552A - Load open circuit detection circuit and method for high-side switch - Google Patents
Load open circuit detection circuit and method for high-side switch Download PDFInfo
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- CN105372552A CN105372552A CN201510915406.7A CN201510915406A CN105372552A CN 105372552 A CN105372552 A CN 105372552A CN 201510915406 A CN201510915406 A CN 201510915406A CN 105372552 A CN105372552 A CN 105372552A
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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
Abstract
The invention discloses a load open circuit detection circuit and method for a high-side switch. The circuit includes a voltage comparator, a voltage acquisition circuit, a current source, a detection resistor and a threshold setting circuit; the current source is connected in parallel with two ends of a high-side switch to be tested; the high-side switch to be tested is connected in series with a load; the detection resistor is commonly connected with the current source and the high-side switch to be tested; the connecting point of the detection resistor, the current source and the high-side switch to be tested is connected with the input end of the voltage acquisition circuit; the output end of the voltage acquisition circuit is connected with the reverse input end of the voltage comparator; the threshold setting circuit is connected with the forward input end of the voltage comparator; and the output end of the voltage comparator is adopted as the output end of the load open circuit detection circuit and is used for outputting load open circuit fault signals. The load open circuit detection circuit and method can be realized through common discrete semiconductor electronic devices; parameters can be adjusted according to use conditions, so that the load open circuit detection circuit and method can be applicable to different power source voltage; and detection sensitivity can be adjusted. The load open circuit detection circuit and method have the advantages of simplicity, easiness in implementation and bright application prospect.
Description
Technical field
The present invention relates to electric, electronic equipment control technology field, be specifically related to a kind of load open-circuit detection circuit for high side switches and method.
Background technology
Electrically, electronic equipment is in the application that a lot of security requirement is higher, need to carry out open and close control by high side switches to load, need whether to disconnect with opertaing device load to detect simultaneously, to report to the police when load and opertaing device surprisingly disconnect, control system that is electric, electronic equipment is made to make corresponding treatment measures, avoid the generation endangered, therefore, the load open circuit that high side switches controls detects very important.
The load open circuit that high side switches controls detects the integrated circuit realization depending on and be arranged in high side switches, but, current integrated circuit is produced by semiconductor maker, only adapt in low-voltage direct application, the occasion relatively high at voltage cannot be applied, how to solve the problem, current urgent problem.
Summary of the invention
During the load open circuit that the existing high side switches of technical matters solved by the invention controls detects, integrated circuit only adapts in low-voltage direct application, in the problem that the occasion that voltage is relatively high cannot be applied.Load open-circuit detection circuit for high side switches of the present invention, is realized by conventional discrete semi-conductor electronic device, can adjust parameter be applicable to different supply voltages according to service condition, adjustable detection sensitivity, circuit is simple, easily realizes, 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 characterized in that: comprise voltage comparator, voltage collection circuit, current source, detect resistance and threshold set circuit, described current source is connected in parallel on the two ends of high side switches to be detected, described high side switches to be detected and load are in series, described detection resistance and current source, high side switches to be detected connects jointly, and tie point is connected with the input end of voltage collection circuit, the output terminal of described voltage collection circuit and the reverse input end of voltage comparator are to being connected, described threshold set circuit is connected with the positive input of voltage comparator, the output terminal of described voltage comparator is as the output terminal of load open-circuit detection circuit, for output load open fault signal.
The aforesaid load open-circuit detection circuit for high side switches, is characterized in that: described high side switches to be detected is mechanical contact switch or contactless semiconductor switch,
The aforesaid load open-circuit detection circuit for high side switches, is characterized in that: described high side switches to be detected is contactless semiconductor switch, then substitute current source with the leakage current of semiconductor switch.
The aforesaid load open-circuit detection circuit for high side switches, it is characterized in that: the detection threshold Vref=i × R1 (1-t%) of described threshold set circuit setting, or Vref=i × (R1//R2) × (1+t%), wherein, i is the output current value of current source, R1 is the resistance detecting resistance, and R2 is the resistance 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, it is characterized in that: comprise the following steps,
Step (1), voltage collection circuit Real-time Collection detects the magnitude of voltage of resistance and current source, high side switches common connecting point to be detected, and by output voltage to the reverse input end of voltage comparator;
Step (2), the detection threshold Vref of setting threshold set circuit, Vref=i × R1 (1-t%), or Vref=i × (R1//R2) × (1+t%), threshold set circuit output detections threshold value Vref is to the positive input of voltage comparator;
Step (3), when the voltage of voltage comparator reverse input end is greater than i × R1 (1-t%), or when being less than i × (R1//R2) × (1+t%), voltage comparator output load open fault signal.
The load open circuit detection method of the aforesaid load open-circuit detection circuit for high side switches, it is characterized in that: step (1) voltage collection circuit Real-time Collection detects the magnitude of voltage of resistance and current source, high side switches common connecting point to be detected, process is as follows
(1) under high side switches off-state, if when the load of connecting with high side switches does not disconnect, output voltage Vs1=i × (R1//R2) of voltage collection circuit, wherein, i is the output current value of current source, and R1 is the resistance detecting resistance, and R2 is the resistance of load;
(2) if when the load of connecting with high side switches disconnects, the resistance R2 of load is tending towards infinitely great, now, and the output voltage Vs2=i × R1 of voltage collection circuit.
The invention has the beneficial effects as follows: the load open-circuit detection circuit for high side switches of the present invention and method, realized by conventional discrete semi-conductor electronic device, parameter can be adjusted according to service condition and be applicable to different supply voltages, adjustable detection sensitivity, circuit is simple, easy realization, is applicable to the occasion of various high side switches supply voltage, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system chart of the load open-circuit detection circuit for high side switches of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, load open-circuit detection circuit for high side switches of the present invention, comprise voltage comparator 1, voltage collection circuit 2, current source 3, detect resistance 6 and threshold set circuit 7, described current source 3 is connected in parallel on the two ends of high side switches 4 to be detected, described high side switches 4 to be detected is in series with load 5, described detection resistance 6 and current source 3, high side switches 4 to be detected connects jointly, and tie point is connected with the input end of voltage collection circuit 2, the output terminal of described voltage collection circuit 2 and the reverse input end of voltage comparator 1 are to being connected, described threshold set circuit 7 is connected with the positive input of voltage comparator 1, the output terminal of described voltage comparator 1 is as the output terminal of load open-circuit detection circuit, for output load open fault signal.
Described high side switches 4 to be detected is mechanical contact switch or contactless semiconductor switch, when high side switches 4 to be detected is contactless semiconductor switch, then substitute current source 3 with the leakage current of semiconductor switch, carry out selecting for current source 3 according to the situation of used high side switches 4.
Detection threshold Vref=i × R1 (1-t%) that described threshold set circuit 7 sets, or Vref=i × (R1//R2) × (1+t%), wherein, i is the output current value of current source 3, and R1 is the resistance detecting resistance 6, and R2 is the resistance of load 5, t% is the range of tolerable variance of threshold set circuit 7, t% is the range of tolerable variance of threshold set circuit 7, and range of tolerable variance t% can choose, generally more than 10% according to open circuit accuracy of detection.
Based on the load open circuit detection method of the above-mentioned load open-circuit detection circuit for high side switches, comprise the following steps,
Step (1), voltage collection circuit 2 Real-time Collection detects the magnitude of voltage of resistance 6 and current source 3, high side switches 4 common connecting point to be detected, and by output voltage to the reverse input end of voltage comparator 1, process is as follows,
(1) under high side switches 4 off-state, if when the load 5 of connecting with high side switches 4 does not disconnect, output voltage Vs1=i × (R1//R2) of voltage collection circuit 2, wherein, i is the output current value of current source 3, and R1 is the resistance detecting resistance 6, and R2 is the resistance of load 5;
(2) if when the load 5 of connecting with high side switches 4 disconnects, the resistance R2 of load 5 is tending towards infinitely great, now, and the output voltage Vs2=i × R1 of voltage collection circuit 2;
Step (2), the detection threshold Vref of setting threshold set circuit 7, Vref=i × R1 (1-t%), or Vref=i × (R1//R2) × (1+t%), threshold set circuit 7 output detections threshold value Vref is to the positive input of voltage comparator 1;
Step (3), when the voltage of voltage comparator 1 reverse input end is greater than i × R1 (1-t%), or when being less than i × (R1//R2) × (1+t%), voltage comparator 1 output load open fault signal.
The present invention can adjust parameter (detecting the resistance of resistance 6 or the detection threshold of threshold set circuit 7) according to service condition and be applicable to different supply voltages, and by adjustment optimum configurations detection sensitivity, realized by conventional discrete semi-conductor electronic device, circuit is simple, easy realization, be applicable to the occasion of various high side switches supply voltage, have a good application prospect.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (6)
1. the load open-circuit detection circuit for high side switches, it is characterized in that: comprise voltage comparator (1), voltage collection circuit (2), current source (3), detect resistance (6) and threshold set circuit (7), described current source (3) is connected in parallel on the two ends of high side switches (4) to be detected, described high side switches to be detected (4) and load (5) are in series, described detection resistance (6) and current source (3), high side switches (4) to be detected connects jointly, and tie point is connected with the input end of voltage collection circuit (2), the output terminal of described voltage collection circuit (2) and the reverse input end of voltage comparator (1) are to being connected, described threshold set circuit (7) is connected with the positive input of voltage comparator (1), the output terminal of described voltage comparator (1) is as the output terminal of load open-circuit detection circuit, for output load open fault signal.
2. the load open-circuit detection circuit for high side switches according to claim 1, is characterized in that: described high side switches to be detected (4) is mechanical contact switch or contactless semiconductor switch.
3. the load open-circuit detection circuit for high side switches according to claim 2, it is characterized in that: described high side switches to be detected (4) is contactless semiconductor switch, then substitute current source (3) with the leakage current of semiconductor switch.
4. the load open-circuit detection circuit for high side switches according to claim 1, it is characterized in that: detection threshold Vref=i × R1 (1-t%) that described threshold set circuit (7) sets, or Vref=i × (R1//R2) × (1+t%), wherein, i is the output current value of current source (3), R1 is for detecting the resistance of resistance (6), R2 is the resistance of load (5), and t% is the range of tolerable variance of threshold set circuit (7).
5., based on the load open circuit detection method of the load open-circuit detection circuit for high side switches according to claim 1, it is characterized in that: comprise the following steps,
Step (1), voltage collection circuit (2) Real-time Collection detects the magnitude of voltage of resistance (6) and current source (3), high side switches to be detected (4) common connecting point, and by output voltage to the reverse input end of voltage comparator (1);
Step (2), the detection threshold Vref of setting threshold set circuit (7), Vref=i × R1 (1-t%), or Vref=i × (R1//R2) × (1+t%), threshold set circuit (7) output detections threshold value Vref is to the positive input of voltage comparator (1);
Step (3), when the voltage of voltage comparator (1) reverse input end is greater than i × R1 (1-t%), or when being less than i × (R1//R2) × (1+t%), voltage comparator (1) output load open fault signal.
6. according to the load open circuit detection method of claim 5 for the load open-circuit detection circuit of high side switches, it is characterized in that: step (1) voltage collection circuit (2) Real-time Collection detect resistance (6) with current source (3), high side switches to be detected (4) common connecting point magnitude of voltage, process is as follows
(1) under high side switches (4) off-state, if when the load (5) of connecting with high side switches (4) does not disconnect, output voltage Vs1=i × (R1//R2) of voltage collection circuit (2), wherein, i is the output current value of current source (3), R1 is for detecting the resistance of resistance (6), and R2 is the resistance of load (5);
(2) if when the load (5) of connecting with high side switches (4) disconnects, the resistance R2 of load (5) is tending towards infinitely great, now, and the output voltage Vs2=i × R1 of voltage collection circuit (2).
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| CN105372552B CN105372552B (en) | 2018-09-21 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300653A (en) * | 2016-04-15 | 2017-10-27 | 英飞凌科技股份有限公司 | Open-circuited load detection in output stage |
| 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 |
| CN110687439A (en) * | 2018-07-06 | 2020-01-14 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method for high-side drive switch |
| CN110769574A (en) * | 2019-12-04 | 2020-02-07 | 中航华东光电有限公司 | Control circuit, key and airborne display of double-color power supply indicator lamp |
| CN110998346A (en) * | 2017-08-03 | 2020-04-10 | 康明斯有限公司 | Open load diagnostics for PWM controlled loads |
| CN111092550A (en) * | 2019-12-25 | 2020-05-01 | 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 |
| CN111766533A (en) * | 2019-04-01 | 2020-10-13 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection 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 |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2781390Y (en) * | 2005-03-14 | 2006-05-17 | 重庆汇力汽车电子仪表有限公司 | Vehicle loading short circuit, open circuit predetection circuit |
| 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 |
| JP2009168712A (en) * | 2008-01-18 | 2009-07-30 | Toshiba Corp | Detection circuit |
| CN203979586U (en) * | 2014-07-23 | 2014-12-03 | 东风汽车公司 | A kind of multipath electrovalve flash control and flash current sampling circuit |
| CN205317878U (en) * | 2015-12-10 | 2016-06-15 | 南京康尼电子科技有限公司 | A load detection circuitry that opens a way for high limit switch |
-
2015
- 2015-12-10 CN CN201510915406.7A patent/CN105372552B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2781390Y (en) * | 2005-03-14 | 2006-05-17 | 重庆汇力汽车电子仪表有限公司 | Vehicle loading short circuit, open circuit predetection circuit |
| 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 |
| JP2009168712A (en) * | 2008-01-18 | 2009-07-30 | Toshiba Corp | Detection circuit |
| CN203979586U (en) * | 2014-07-23 | 2014-12-03 | 东风汽车公司 | A kind of multipath electrovalve flash control and flash current sampling circuit |
| CN205317878U (en) * | 2015-12-10 | 2016-06-15 | 南京康尼电子科技有限公司 | A load detection circuitry that opens a way for high limit switch |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10338126B2 (en) | 2016-04-15 | 2019-07-02 | Infineon Technologies Ag | Open load detection in output stages |
| CN107300653A (en) * | 2016-04-15 | 2017-10-27 | 英飞凌科技股份有限公司 | Open-circuited load detection in output stage |
| CN110998346A (en) * | 2017-08-03 | 2020-04-10 | 康明斯有限公司 | Open load diagnostics for PWM controlled loads |
| CN110687439B (en) * | 2018-07-06 | 2020-10-27 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method for high-side drive switch |
| CN110687439A (en) * | 2018-07-06 | 2020-01-14 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method for high-side drive switch |
| 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 |
| CN111766533A (en) * | 2019-04-01 | 2020-10-13 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method |
| CN110769574A (en) * | 2019-12-04 | 2020-02-07 | 中航华东光电有限公司 | Control circuit, key and airborne display of double-color power supply indicator lamp |
| CN111092550A (en) * | 2019-12-25 | 2020-05-01 | 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 |
| 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 |
| 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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| CN105372552B (en) | 2018-09-21 |
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