CN2779725Y - Vehicle load electric control switch having short circuit predetection - Google Patents
Vehicle load electric control switch having short circuit predetection Download PDFInfo
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- CN2779725Y CN2779725Y CN 200520033541 CN200520033541U CN2779725Y CN 2779725 Y CN2779725 Y CN 2779725Y CN 200520033541 CN200520033541 CN 200520033541 CN 200520033541 U CN200520033541 U CN 200520033541U CN 2779725 Y CN2779725 Y CN 2779725Y
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Abstract
The utility model relates to a vehicular load electric control switch with the function of short circuit predetection, which is composed of an electric control switch, a signal source, a current limiter, a predetection switch, a short-circuit measuring reference voltage circuit and a comparator, wherein the predetection switch is switched on after enabling signal is received, the signal source and the current limiter form a voltage division circuit together with the load to be measured, the resistance value of the load to be measured is converted into voltage signal in the form of voltage division and then input to an input end of the comparator, the short-circuit measuring reference voltage circuit offers short-circuit reference voltage which is then input to the other input end of the comparator, and whether the load to be measured is in short circuit or not is determined by early-warning signal which is output by the comparator in the end. When the automotive power source is switched on, the utility model pre-detects the conditions of the load, and the early-warning signal which can determine whether the load to be measured is in short circuit or not can be obtained at an output end of the circuit. The electric control switch is controlled according to the early-warning signal, so that the electric control switch is protected.
Description
Technical field
The utility model relates to automobile load electric-controlled switch, especially a kind of automobile load electric-controlled switch with the short circuit pre-detection.
Background technology
At present, before automobile power source starts or before electric-controlled switch is opened, load might be to be in short-circuit condition, and known automobile electrically-controlled switch does not have the function of load short circuits pre-detection, and can not send early warning signal to load short circuits, if load on the preceding just short circuit that powers on, the big electric current of powered on moment just may the damage car electric-controlled switch, if just short circuit of load before opening electric-controlled switch, remove to open electric-controlled switch again, electric-controlled switch also can be damaged, and in addition, the driver can not obtain early warning signal.
Summary of the invention
The purpose of this utility model provides a kind ofly carries out the short circuit pre-detection to the automobile load when automobile power source one is opened, and the output early warning signal, thereby electric-controlled switch is played the automobile load electric-controlled switch of band short circuit pre-detection of the effect of protection.
In order to achieve the above object, the technical solution of the utility model is: a kind of automobile load electric-controlled switch with the short circuit pre-detection, described automobile load electric-controlled switch is made of pre-detection circuit and electric-controlled switch, wherein pre-detection circuit and the electric-controlled switch load to be measured that is connected in parallel, described pre-detection circuit is by signal source, flow restricter, pre-slowdown monitoring switch, survey the short circuit reference voltage circuit, comparator constitutes, after wherein pre-slowdown monitoring switch receives enable signal, the prediction switch conduction, signal source, flow restricter and load to be measured formation bleeder circuit are converted to the input that voltage signal is input to comparator with the resistance of load to be measured by the dividing potential drop mode, survey another input of the given short circuit reference voltage input comparator of short circuit reference voltage circuit, determine whether short circuit of load to be measured by the early warning signal of comparator output, disconnect pre-slowdown monitoring switch then.If load to be measured is a path, then can give the electric-controlled switch switching signal, the electric-controlled switch conducting, loaded work piece if load to be measured is short circuit, then can not be given the electric-controlled switch switching signal, in order to avoid damage electric-controlled switch.
Automobile power source is opened, electric-control system provides enable signal on the car, prediction switch conduction in this programme, signal source, flow restricter, load to be measured forms bleeder circuit, the resistance of load to be measured is converted to the negative terminal that voltage signal is input to comparator by the dividing potential drop mode, the anode of comparator given one survey the short circuit reference voltage, under the situation of load path, the comparator output low level, can give the electric-controlled switch switching signal, the electric-controlled switch conducting, if loaded work piece is the comparator upset, be output as high level, then load short circuits can not make the electric-controlled switch conducting to switching signal, avoids damaging electric-controlled switch.
The utility model has the advantages that: automobile power source one is opened; the utility model is just made pre-detection to the situation of load; can obtain judging the whether early warning signal of short circuit of load to be measured at the output of circuit, if short circuit then do not open electric-controlled switch, thus electric-controlled switch is played the effect of protection.
Description of drawings
In conjunction with the embodiments the utility model is described
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
Automobile load electric-controlled switch such as Fig. 1 of the utility model band short circuit pre-detection, shown in Figure 2: described automobile load electric-controlled switch is made of pre-detection circuit and electric-controlled switch, wherein pre-detection circuit and the electric-controlled switch load to be measured that is connected in parallel, described pre-detection circuit is by signal source, flow restricter, pre-slowdown monitoring switch, survey the short circuit reference voltage circuit, comparator constitutes, after wherein pre-slowdown monitoring switch receives enable signal, the prediction switch conduction, signal source, flow restricter and load to be measured formation bleeder circuit are converted to the input that voltage signal is input to comparator with the resistance of load to be measured by the dividing potential drop mode, survey another input of the given short circuit reference voltage input comparator of short circuit reference voltage circuit, determine whether short circuit of load to be measured by the early warning signal of comparator output, disconnect pre-slowdown monitoring switch then.If load is a path, then can give the electric-controlled switch switching signal, the electric-controlled switch conducting, loaded work piece is if short circuit then can not be given the electric-controlled switch switching signal, in order to avoid damage electric-controlled switch.Described load RL to be measured is an electrical apparatus for vehicle use.
See that Fig. 2 as can be known: the signal source VCC in the described bleeder circuit, flow restricter R1, D1, load RL to be measured and 1 series connection of prediction K switch, the common port of flow restricter R1 and prediction K switch 1 connects the negative terminal of comparator IC4A through isolation resistance R2.K2 is an electric-controlled switch described in the utility model.
See that Fig. 2 also as can be known: described survey short circuit reference voltage circuit is made of the 3rd divider resistance R3, the 4th divider resistance R4, isolation resistance R5, wherein the 3rd divider resistance R3, the 4th divider resistance R4 are connected between signal source VCC and the ground GND, and the common port of the 3rd divider resistance R3, the 4th divider resistance R4 connects the anode of comparator IC4A by isolation resistance R5.
The utility model is work like this, the enable signal input, 1 conducting of prediction K switch, signal source VCC, flow restricter R1, D1, prediction K switch 1 and load RL to be measured form bleeder circuit, the resistance of load to be measured is converted to voltage signal by the dividing potential drop mode, this voltage signal is input to the negative terminal of comparator IC4A through isolation resistance R2, the 3rd divider resistance R3, the voltage signal that the survey short circuit reference voltage circuit that the 4th divider resistance R4 forms provides is through the anode of isolation resistance R5 input comparator IC4A, under the path situation, the negative terminal voltage of comparator IC4A is higher than positive terminal voltage, so the output of comparator is low level " 0 "; When load RL short circuit to be measured, applied signal voltage reduces, and the positive terminal voltage of comparator IC4A is higher than negative terminal voltage, comparator IC4A upset, and the short circuit early warning signal of output is high level " 1 "; Judge whether short circuit of load RL to be measured according to the short circuit early warning signal of output, disconnect prediction K switch 1 then, if load RL to be measured is a path, then can give electric-controlled switch K2 switching signal, electric-controlled switch K2 conducting, load RL work to be measured is if load RL to be measured short circuit, then can not give electric-controlled switch K2 switching signal, in order to avoid damage electric-controlled switch.
Claims (4)
1, a kind of automobile load electric-controlled switch with the short circuit pre-detection, it is characterized in that: described automobile load electric-controlled switch is made of pre-detection circuit and electric-controlled switch, wherein pre-detection circuit and the electric-controlled switch load to be measured that is connected in parallel, described pre-detection circuit is by signal source, flow restricter, pre-slowdown monitoring switch, survey the short circuit reference voltage circuit, comparator constitutes, after wherein pre-slowdown monitoring switch receives enable signal, the prediction switch conduction, signal source, flow restricter and load to be measured formation bleeder circuit are converted to the input that voltage signal is input to comparator with the resistance of load to be measured by the dividing potential drop mode, survey another input of the given short circuit reference voltage input comparator of short circuit reference voltage circuit, determine whether short circuit of load to be measured by the early warning signal of comparator output at last.
2, the automobile load electric-controlled switch of band short circuit pre-detection according to claim 1, it is characterized in that: the signal source in the described bleeder circuit (VCC), flow restricter (R1, D1), load to be measured (RL) and pre-slowdown monitoring switch (K1) series connection, the common port of flow restricter (R1) and pre-slowdown monitoring switch (K1) connects the negative terminal of comparator (IC4A) through isolation resistance (R2).
3, the automobile load electric-controlled switch of band short circuit pre-detection according to claim 1, it is characterized in that: described survey short circuit reference voltage circuit is made of the 3rd divider resistance (R3), the 4th divider resistance (R4), isolation resistance (R5), wherein the 3rd divider resistance (R3), the 4th divider resistance (R4) are connected between signal source (VCC) and the ground (GND), and the common port of the 3rd divider resistance (R3), the 4th divider resistance (R4) connects the anode of comparator (IC4A) by isolation resistance (R5).
4, the automobile load electric-controlled switch of band short circuit pre-detection according to claim 1 and 2 is characterized in that: described load to be measured (RL) is an electrical apparatus for vehicle use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520033541 CN2779725Y (en) | 2005-03-17 | 2005-03-17 | Vehicle load electric control switch having short circuit predetection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520033541 CN2779725Y (en) | 2005-03-17 | 2005-03-17 | Vehicle load electric control switch having short circuit predetection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2779725Y true CN2779725Y (en) | 2006-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520033541 Expired - Fee Related CN2779725Y (en) | 2005-03-17 | 2005-03-17 | Vehicle load electric control switch having short circuit predetection |
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| Country | Link |
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| CN (1) | CN2779725Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320247A (en) * | 2011-07-07 | 2012-01-18 | 丽水职业技术学院 | Automobile short-circuit protection, indication and alarm device |
| CN102720492A (en) * | 2012-05-29 | 2012-10-10 | 三一重型装备有限公司 | Development machine and on-off state detecting device of development machine |
| WO2020134234A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳市九洲电器有限公司 | Short circuit protection circuit of interface and set-top box |
| 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 |
-
2005
- 2005-03-17 CN CN 200520033541 patent/CN2779725Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320247A (en) * | 2011-07-07 | 2012-01-18 | 丽水职业技术学院 | Automobile short-circuit protection, indication and alarm device |
| CN102720492A (en) * | 2012-05-29 | 2012-10-10 | 三一重型装备有限公司 | Development machine and on-off state detecting device of development machine |
| WO2020134234A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳市九洲电器有限公司 | Short circuit protection circuit of interface and set-top box |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |