CN203658552U - Low side driving circuit capable of being used for detecting short circuit of power supply - Google Patents
Low side driving circuit capable of being used for detecting short circuit of power supply Download PDFInfo
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- CN203658552U CN203658552U CN201320711357.1U CN201320711357U CN203658552U CN 203658552 U CN203658552 U CN 203658552U CN 201320711357 U CN201320711357 U CN 201320711357U CN 203658552 U CN203658552 U CN 203658552U
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Abstract
The utility model discloses a low side driving circuit capable of being used for detecting short circuit of a power supply. The low side driving circuit comprises a load device, a low side driving module which is connected with the load device for driving the load device to work, a short circuit detection module which is respectively connected with the load device and the low side driving module, and a control module which is respectively connected with the short circuit detection module and the low side driving module. The low side driving circuit realizes the detection and the real-time control of the load power supply in short circuit by connecting the short circuit detection module, the low side driving module, the control module and the like with the load device respectively, thereby ensuring the safety of the low side driving circuit and other electronic appliances.
Description
Technical field
The utility model relates to a kind of low limit driving circuit, particularly relates to a kind of low limit driving circuit that can be used for detecting power supply short circuit.
Background technology
Be used for being connected with one end of load device the drive output of the low limit driving circuit that drives load device (as solenoid valve, relay etc. on vehicle), another termination of load device is the power supply of load device power supply.Because drive output inevitably can occur and the risk of the direct short circuit of load power source, thereby cause possibly driver element and other electronic apparatus to be burnt.
In order to solve the existing above-mentioned technical matters of low limit driving circuit, at present in product design, as need adopt low limit driving circuit.Generally to adopt intelligent power to drive chip, although intelligent power drives chip self to have short-circuit protection function, but because it is expensive and procurement cycle is long, be difficult to meet low cost control requirement when researching and developing the requirement to time schedule early stage and producing in batches, and, because intelligent power drives the integrated fault diagnosis circuit of chip internal, part of module driving chip package is large and radiating effect is poor, therefore need take into full account PCB(Printed Circuit Board in development, circuit board) layout to be to meet the requirement of thermal diffusivity, cost and the design difficulty of product development are increased, in addition,, because component number is more, this is by the risk that greatly increases the increase of counting out because of fault and bring.
Utility model content
(1) technical matters that will solve
For overcoming above-mentioned the deficiencies in the prior art, the utility model provides a kind of low limit driving circuit that can be used for detecting power supply short circuit, it is by being connected with drive control module philosophy short-circuit detecting module with load device, to realize the detection during to load power source short circuit and to control, and then guarantee in real time the security of low limit driving circuit and other electronic apparatus.
(2) technical scheme
For achieving the above object, the low limit of the utility model driving circuit comprises: load device; Be connected with load device for driving the low limit driver module of its work; The short-circuit detecting module being connected with load device and low limit driver module respectively; And be connected with short-circuit detecting module and low limit driver module respectively control module, for driving each module to carry out work according to low limit described in the detection signal control of short-circuit detecting module.
Wherein, described low limit driver module has drive output; Wherein said low limit driver module is connected with described load device by described drive output.
Preferably, described low limit driver module comprises switching tube.
Especially, described switching tube is the switching tube that a kind of low level is turn-offed, high level is opened.
Preferably, described switching tube is NPN transistor and/or N road ditch metal-oxide-semiconductor.
Wherein, described control module comprises controller, and controller is preferably single-chip microprocessor MCU and/or dsp processor and/or arm processor.
Preferably, described load device is solenoid valve and/or relay.
Preferably, described short-circuit detecting module is connected with the drive output of described low limit driver module.
Preferably, described low limit driver module comprises: the first resistance; And the N road ditch switching tube being connected with the second input/output port of described control module by the first resistance, described N road ditch switching tube has one end ground connection, the other end to connect described load device.
Preferably, described short-circuit detecting module comprises: testing circuit; And the signal processing module being connected with testing circuit; Wherein said short-circuit detecting module is connected with described load device and described low limit driver module respectively by described testing circuit.
Preferably, described testing circuit comprises the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and triode; Base stage one end of wherein said triode is connected with described N road ditch switching tube and load device respectively by the second resistance, and is connected with ground by the 3rd resistance; Collector one end of described triode is connected with external power source by the 5th resistance, and is connected with the first input/output port of described control module by the 4th resistance; Emitter one end of described triode is connected with ground.
(3) beneficial effect
Compared with prior art, the utlity model has following advantage:
1) the low limit of the utility model driving circuit is by being connected short-circuit detecting module with load device, detection of dynamic while having realized load power source short circuit, by low limit driver module is connected with control module with load device respectively, realize the real-time control to testing result, and then guaranteed the safety of low limit driving circuit and other electronic apparatus;
2) low limit of the present utility model driver module is preferably made up of the switching tube that NPN transistor, N road ditch metal-oxide-semiconductor etc. can low level turn-off, high level is opened, and can realize to negative pressure device more flexibly, more effectively control;
3) control module of the present utility model is preferably made up of the controller such as single-chip microprocessor MCU, dsp processor, it can send the control signal of low limit driver module, realize the opening and closing of low limit driver module, and can carry out logic judgement according to the input signal of short-circuit detecting module, determine that whether the output terminal of low limit driver module is in the state to load power source short circuit, and then judge whether to close low limit driver module, realize dynamically, efficiently control;
4) short-circuit detecting module of the present utility model can be sent to control module in time by the short-circuit condition signal of detection, realizes the fast detecting of voltage signal and fast output, guarantee whole low limit driving circuit efficiently, reliably running;
5) logical operation of the low limit of the utility model driving circuit realizes by software, make that Logic Circuit Design is simpler, circuit elements device still less, cost is cheaper, resolution element is realized completely, and encapsulation essence is little, thermal value is low, can be widely used in the driving load aspect in the fields such as vehicle.
Accompanying drawing explanation
Fig. 1 is the low limit of the utility model drive circuit system structured flowchart;
Fig. 2 is low limit drive circuit works schematic diagram in the utility model the first embodiment.
Description of reference numerals: 1-load device; The low limit of 2-driver module; 3-short-circuit detecting module; 4-control module.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.It should be noted that, accompanying drawing is only for explaining the utility model, is to the schematically illustrating of the utility model embodiment, and can not be interpreted as restriction of the present utility model.
As shown in Figure 1, the low limit of the utility model driving circuit mainly comprises: load device 1, low limit driver module 2, short-circuit detecting module 3 and control module 4 etc.Low limit driver module 2 is connected with load device 1, for driving load device 1 to work; Short-circuit detecting module 3 is connected with load device 1 and low limit driver module 2 respectively, can be used for detecting the short-circuit signal of load device 1 and driver module 2 the two junction, low limit; Control module 4 is connected with short-circuit detecting module 3 and low limit driver module 2 respectively, can drive each module 2 to carry out work according to the low limit of detection signal control of short-circuit detecting module 3.
Particularly, low limit driver module 2 has drive output, and low limit driver module 2 is connected with load device 1 by this drive output.Low limit driver module 2 is mainly made up of one or more switching tubes, and the switching tube switching tube that preferably a kind of low level is turn-offed, high level is opened, as NPN transistor, N road ditch metal-oxide-semiconductor maybe can be realized other switching tubes of identity logic function.Control module 4 is mainly made up of controller, can be single-chip microprocessor MCU (Micro Control Unit, micro-control unit), DSP(Digital Signal Processing, the theory of digital signal processing and method) processor or arm processor (Advanced RISC Machines, microprocessor) or other can realize one or more in same or similar logic function controller.Control module 4 can be sent the control signal of low limit driver module 2, realize the open and close of low limit driver module 2, can carry out logic judgement according to the input signal of short-circuit detecting module 3 simultaneously, determine that whether low limit driver module 2 output terminals are in the state to load power source short circuit, and then judge whether to close low limit driver module 2.Load device 1 is the object that low limit drives, and can be various solenoid valves, relay etc.
Short-circuit detecting module 3 is cores that the utility model carries out voltage signal detection, preferably be connected with the drive output of low limit driver module 2, its function is to detect the magnitude of voltage of load device 1 and low limit driver module 2 tie points, when normal work, the magnitude of voltage of this point is low level, if when this point and load power source short circuit, short-circuit detecting module 3 will be sent short-circuit condition signal to control module 4, if control module 4 is through thinking after logic judgement that the output of low limit driver module 2 is in the state to load power source short circuit, send the instruction of closing low limit driver module 2, so that load power-off, quit work, the safety of protection load device 1 and other electron devices.The signal processing module that short-circuit detecting module 3 is preferably connected by testing circuit and with testing circuit etc. forms, now, short-circuit detecting module 3 will be connected with load device 1 and low limit driver module 2 respectively by testing circuit, definitely, short-circuit detecting module 3 is connected with the drive output of low limit driver module 2 by testing circuit.
In order to be illustrated more clearly in the principle of work of the low limit of the utility model driving circuit, be described in further details below in conjunction with embodiment.
The first embodiment
Fig. 2 shows low limit drive circuit works schematic diagram in the utility model the first embodiment
(1) low limit driving circuit is normally worked
In the time that single-chip microcomputer is exported high level by the second input/output port IO2, the grid voltage of low limit driving switch pipe Q1 becomes high level, and now switching tube Q1 opens, and load supplying is normally worked; The base voltage of T1 is low simultaneously, NPN transistor is in cut-off state, there is high level in the first input/output port IO1 of the single-chip microcomputer being connected with the 4th resistance R 4, single-chip microcomputer thinks that this state bends down limit and drives load end working properly, does not occur load power source short circuit.
In the time that single-chip microcomputer passes through the second input/output port IO2 output low level, the grid voltage of low limit driving switch pipe Q1 becomes low level, and now switching tube Q1 closes, and load power source is stopped power supply; The base voltage of triode T1 becomes high level simultaneously, NPN transistor is in conducting state, there is low level in the first input/output port IO1 of the single-chip microcomputer being connected with the 4th resistance R 4, single-chip microcomputer thinks that this state bends down limit and drives not work, does not occur load power source short circuit.
The 3rd resistance R 3 and the second resistance R 2 form bleeder circuit, guarantee that the base stage of triode T1 is reliably ended in the time of cut-off.
Become low level or when low level becomes the transient state of high level at the second input/output port IO2 of single-chip microcomputer from high level, can realize by software algorithm control and the judgement of circuit state, the thermal value of the short circuit of the low limit drive output of transient state on power source loads does not affect the function of circuit.
(2) flash drives load end shorted to earth
In the time that single-chip microcomputer is exported high level by the second input/output port IO2, the grid voltage of low limit driving switch pipe Q1 becomes high level, now switching tube is opened, load supplying, if load is during to power supply short circuit, now the base voltage of Q1 is high level, NPN transistor is in saturation conduction state, there is low level in single-chip microcomputer the first input/output port IO1 being connected with the 4th resistance R 4, because now flash driving switch is in opening, single-chip microcomputer thinks that loaded work piece is undesired under this state, there is the fault to load power source short circuit in load, the second input/output port IO2 output low level of single-chip microcomputer, the grid voltage of low limit driving switch pipe Q1 becomes low-voltage, now switching tube Q1 closes, load power-off quits work, realize the protection to driving circuit and electronic apparatus.
Much more no longer above-described embodiment is one of the present utility model preferably can certainly realize identical function by principle described herein and miscellaneous part, to state herein.
The low limit of the utility model driving circuit is by being connected short-circuit detecting module 3 with load device 1, detection of dynamic while having realized load power source short circuit, by low limit driver module 2 is connected with control module 4 with load device 1 respectively, realize the real-time control to testing result, and then guaranteed the safety of low limit driving circuit and other electronic apparatus; Low limit driver module 2 preferably can low level be turn-offed, high level is opened by NPN transistor, N road ditch metal-oxide-semiconductor etc. switching tube form, can realize to negative pressure device more flexibly, more effectively control; Control module 4 is preferably made up of the controller such as single-chip microprocessor MCU, dsp processor, it can send the control signal of low limit driver module, realize the opening and closing of low limit driver module, and can carry out logic judgement according to the input signal of short-circuit detecting module, determine that whether the output terminal of low limit driver module 2 is in the state to load power source short circuit, and then judge whether to close low limit driver module 2, realize dynamically, efficiently control; Short-circuit detecting module 3 can be sent to control module 4 in time by the short-circuit condition signal of detection, realizes the fast detecting of voltage signal and fast output, guarantee whole low limit driving circuit efficiently, reliably running; In addition, the logical operation of the low limit of the utility model driving circuit realizes by software, make that Logic Circuit Design is simpler, circuit elements device still less, cost is cheaper, resolution element is realized completely, and encapsulation essence is little, thermal value is low, can be widely used in the driving load aspect in the fields such as vehicle.
It should be noted that; although above the utility model is explained in detail; but the utility model is not limited to this; the interior perhaps principle that those of ordinary skills can record according to the utility model is modified; therefore the various modifications that, all interior perhaps principles of recording according to the utility model are carried out all should fall into protection domain of the present utility model.
Claims (9)
1. a low limit driving circuit that can be used for detecting power supply short circuit, is characterized in that, it comprises:
Load device (1);
Be connected with load device (1) for driving the low limit driver module (2) of its work;
The short-circuit detecting module (3) being connected with load device (1) and low limit driver module (2) respectively; And
The control module (4) being connected with short-circuit detecting module (3) and low limit driver module (2) respectively;
Described control module (4) comprises controller; Wherein, described controller is single-chip microprocessor MCU and/or dsp processor and/or arm processor.
2. low limit according to claim 1 driving circuit, is characterized in that, described low limit driver module (2) has drive output; Wherein
Described low limit driver module (2) is connected with described load device (1) by described drive output.
3. low limit according to claim 2 driving circuit, is characterized in that, described low limit driver module (2) comprises switching tube.
4. low limit according to claim 3 driving circuit, is characterized in that, described switching tube is the switching tube that a kind of low level is turn-offed, high level is opened.
5. low limit according to claim 4 driving circuit, is characterized in that, described switching tube is NPN transistor and/or N road ditch metal-oxide-semiconductor.
6. low limit according to claim 2 driving circuit, is characterized in that, described load device (1) is solenoid valve and/or relay.
7. according to the low limit driving circuit described in claim 1-6 any one, it is characterized in that, described low limit driver module (2) comprising:
The first resistance (R1); And
The N road ditch switching tube (Q1) being connected with second input/output port (IO2) of described control module (4) by the first resistance (R1), described N road ditch switching tube (Q1) has one end ground connection, the other end to connect described load device (1).
8. low limit according to claim 7 driving circuit, is characterized in that, described short-circuit detecting module (3) comprising:
Testing circuit; And
The signal processing module being connected with testing circuit; Wherein
Described short-circuit detecting module (3) is connected with described load device (1) and described low limit driver module (2) respectively by described testing circuit.
9. low limit according to claim 8 driving circuit, is characterized in that, described testing circuit comprises triode (T1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the 5th resistance (R5); Wherein
Base stage one end of described triode (T1) is connected with described N road ditch switching tube (Q1) and load device (1) respectively by the second resistance (R2), and is connected with ground by the 3rd resistance (R3);
Collector one end of described triode (T1) is connected with external power source by the 5th resistance (R5), and is connected with first input/output port (IO1) of described control module (4) by the 4th resistance (R4);
Emitter one end of described triode (T1) is connected with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320711357.1U CN203658552U (en) | 2013-11-12 | 2013-11-12 | Low side driving circuit capable of being used for detecting short circuit of power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320711357.1U CN203658552U (en) | 2013-11-12 | 2013-11-12 | Low side driving circuit capable of being used for detecting short circuit of power supply |
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| CN203658552U true CN203658552U (en) | 2014-06-18 |
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| CN201320711357.1U Expired - Fee Related CN203658552U (en) | 2013-11-12 | 2013-11-12 | Low side driving circuit capable of being used for detecting short circuit of power supply |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105278525A (en) * | 2015-11-13 | 2016-01-27 | 兰州飞行控制有限责任公司 | Parallel steering engine drive circuit with fault monitoring function |
| CN105857215A (en) * | 2016-04-21 | 2016-08-17 | 中国北方车辆研究所 | Reverse-connection-preventing and power-off post-processing circuit for vehicle-mounted control unit power supply |
| CN106896755A (en) * | 2015-12-18 | 2017-06-27 | 联创汽车电子有限公司 | The load driving circuits of automobile-used single low side control |
| CN107438302A (en) * | 2016-05-26 | 2017-12-05 | 重庆恒又源科技发展有限公司 | LED short circuit protection systems |
| CN107907777A (en) * | 2017-10-27 | 2018-04-13 | 广东美的厨房电器制造有限公司 | A kind of short-circuit detecting circuit and method, control circuit |
| CN108616267A (en) * | 2016-12-12 | 2018-10-02 | 中国航空工业集团公司西安航空计算技术研究所 | With PHM functions can parallel configuration the low side power switch of intelligence |
| CN110361621A (en) * | 2018-04-11 | 2019-10-22 | 佛山市顺德区美的电热电器制造有限公司 | Load detecting circuit and method |
| CN111123161A (en) * | 2019-12-30 | 2020-05-08 | 潍柴动力股份有限公司 | Wire harness electrical fault detection method and device and controller |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| WO2022000597A1 (en) * | 2020-06-29 | 2022-01-06 | 深圳市华思旭科技有限公司 | On/off identification circuit and electric device |
| US11867748B2 (en) | 2019-08-30 | 2024-01-09 | Contemporary Amperex Technology Co., Limited | Electrical control device detection circuit, detection method, and electric vehicle |
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2013
- 2013-11-12 CN CN201320711357.1U patent/CN203658552U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105278525A (en) * | 2015-11-13 | 2016-01-27 | 兰州飞行控制有限责任公司 | Parallel steering engine drive circuit with fault monitoring function |
| CN106896755B (en) * | 2015-12-18 | 2020-01-14 | 联创汽车电子有限公司 | Load driving circuit for single-low end control of vehicle |
| CN106896755A (en) * | 2015-12-18 | 2017-06-27 | 联创汽车电子有限公司 | The load driving circuits of automobile-used single low side control |
| CN105857215A (en) * | 2016-04-21 | 2016-08-17 | 中国北方车辆研究所 | Reverse-connection-preventing and power-off post-processing circuit for vehicle-mounted control unit power supply |
| CN105857215B (en) * | 2016-04-21 | 2017-11-14 | 中国北方车辆研究所 | Vehicular control unit power supply reverse connection protection and power down post processing circuitry |
| CN107438302A (en) * | 2016-05-26 | 2017-12-05 | 重庆恒又源科技发展有限公司 | LED short circuit protection systems |
| CN108616267A (en) * | 2016-12-12 | 2018-10-02 | 中国航空工业集团公司西安航空计算技术研究所 | With PHM functions can parallel configuration the low side power switch of intelligence |
| CN107907777A (en) * | 2017-10-27 | 2018-04-13 | 广东美的厨房电器制造有限公司 | A kind of short-circuit detecting circuit and method, control circuit |
| CN107907777B (en) * | 2017-10-27 | 2020-07-31 | 广东美的厨房电器制造有限公司 | Short circuit detection circuit and method and control circuit |
| CN110361621A (en) * | 2018-04-11 | 2019-10-22 | 佛山市顺德区美的电热电器制造有限公司 | Load detecting circuit and method |
| CN110361621B (en) * | 2018-04-11 | 2021-11-19 | 佛山市顺德区美的电热电器制造有限公司 | Load detection circuit and method |
| US11867748B2 (en) | 2019-08-30 | 2024-01-09 | Contemporary Amperex Technology Co., Limited | Electrical control device detection circuit, detection method, and electric vehicle |
| CN111123161A (en) * | 2019-12-30 | 2020-05-08 | 潍柴动力股份有限公司 | Wire harness electrical fault detection method and device and controller |
| CN111123161B (en) * | 2019-12-30 | 2022-04-29 | 潍柴动力股份有限公司 | Wire harness electrical fault detection method and device and controller |
| WO2022000597A1 (en) * | 2020-06-29 | 2022-01-06 | 深圳市华思旭科技有限公司 | On/off identification circuit and electric device |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN112255937B (en) * | 2020-09-18 | 2024-03-19 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
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Effective date of registration: 20180508 Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Patentee after: Beijing treasure Car Co.,Ltd. Address before: 102206, Beijing, Shahe Town, Changping District Road, sand Yang Patentee before: BEIQI FOTON MOTOR Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20211112 |
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| CF01 | Termination of patent right due to non-payment of annual fee |