CN112455366B - Automobile combination instrument control circuit capable of detecting high-side load open circuit - Google Patents
Automobile combination instrument control circuit capable of detecting high-side load open circuit Download PDFInfo
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- CN112455366B CN112455366B CN202011094206.7A CN202011094206A CN112455366B CN 112455366 B CN112455366 B CN 112455366B CN 202011094206 A CN202011094206 A CN 202011094206A CN 112455366 B CN112455366 B CN 112455366B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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Abstract
The invention relates to the technical field of automobile combination instrument control circuits, in particular to an automobile combination instrument control circuit capable of detecting a high-side load open circuit, which comprises a control chip, a driver chip, a high-side load RL and a triode, wherein the control chip is connected with the driver chip; the first input/output port of the control chip is connected with the base electrode of the triode, the emitter electrode of the control chip is connected with a power supply VCC, and the collector electrode of the control chip is connected with the high-side load RL and the analog-to-digital conversion input end of the control chip in parallel; and a second input/output port of the control chip is connected with an enabling end of the driver chip, and an output end of the driver chip is connected with the high-side load RL. The invention solves the problems of more circuit elements, more complicated circuits, higher cost and poorer anti-interference performance caused by the fact that the existing automobile combined instrument can only detect through a specific module when detecting a high-side load open circuit.
Description
Technical Field
The invention relates to the technical field of automobile combination instrument control circuits, in particular to an automobile combination instrument control circuit capable of detecting a high-side load open circuit.
Background
The instrument is an interactive interface between a driver and the automobile, provides information such as required automobile operation parameters, faults, mileage and the like for the driver, and is an essential component of each automobile.
Existing automobile combination meters are generally provided with a high-side driver circuit module, and the high-side driver circuit module is required to have the function of detecting a high-side load open circuit.
When the existing automobile combination instrument detects that a high-side load is open-circuited, a high-side driving control circuit module, a current source switch control circuit module, a voltage acquisition circuit module and a voltage comparator circuit module are required to be arranged, so that the problems of more circuit modules, more circuits, more elements, higher cost and poor anti-interference capability can be caused.
Disclosure of Invention
The invention aims to provide an automobile combined instrument control circuit capable of detecting a high-side load open circuit, which mainly solves the problems that the existing automobile combined instrument can only detect through a specific module when detecting the high-side load open circuit, and the circuit elements are more, the circuit is more complex, the cost is higher and the anti-interference performance is poor.
The invention provides an automobile combination instrument control circuit capable of detecting a high-side load open circuit, which comprises a control chip, a driver chip, a high-side load RL and a triode, wherein the control chip is connected with the driver chip; the first input/output port of the control chip is connected with the base electrode of the triode, the emitter electrode of the control chip is connected with a power supply VCC, and the collector electrode of the control chip is connected with the high-side load RL and the analog-to-digital conversion input end of the control chip in parallel; the second input/output port of the control chip is connected with the enabling end of the driver chip, and the output end of the driver chip is connected with the high-side load RL;
when the control chip enables the second input/output port to output low level, the enabling end of the driver chip receives low level and controls the high-side load RL to stop working, meanwhile, the first input/output port of the control chip outputs low level, the triode is conducted, and at the moment, if the analog-to-digital conversion input end of the control chip detects that the voltage value is larger than the open circuit threshold value, the high-side load RL is judged to be open circuit.
Preferably, the high-side load voltage acquisition circuit comprises a high-side drive control circuit module, a voltage source switch control circuit module and a high-side load voltage acquisition circuit module; the high-side drive control circuit module comprises the driver chip and a high-side load RL which are electrically connected; the voltage source switch control circuit module comprises the triode; the high-side load circuit acquisition circuit module comprises the control chip.
Preferably, the high-side driving control circuit module further comprises a first filter circuit and a diode D1; the second input/output port of the control chip is connected in series with the first filter circuit and then is connected to the enabling end of the driver chip; the diode D1 is arranged between the output end of the driver chip and the high-side load RL, and the anode of the diode D1 is connected with the output end of the driver chip.
Preferably, the first filter circuit includes a resistor R1, a resistor R2 and a capacitor C1; the second input/output port of the control chip is connected in series with the resistor R1 and then connected to the enabling end of the driver chip, the resistor R1 and the enabling end of the driver chip are connected in parallel with one end of the resistor R2 and one end of the capacitor C1, and the other ends of the resistor R2 and the capacitor C1 are grounded.
Preferably, the voltage source switch control circuit module comprises a second filter circuit, a resistor R3, a resistor R4, a capacitor C2 and a diode D2; the first input/output port of the control chip is connected with the second filter circuit in series and then connected with the base electrode of the triode; the power supply VCC is connected with the capacitor C2, the resistor R3 and the emitting electrode of the triode in parallel, the other end of the capacitor C2 is grounded, and the other end of the resistor R3 is connected into the second filter circuit; the collector of the triode is connected in series with the resistor R4 and the diode D2, then is connected between the cathode of the diode D1 and the high-side load RL in parallel, and the anode of the diode D2 is connected with the resistor R4.
Preferably, the second filter circuit includes a resistor R5 and a capacitor C3; one end of the resistor R5 is connected with the first input/output port of the control chip, and the other end of the resistor R5 is connected with the capacitor C3, the base electrode of the triode and the resistor R3 in parallel; the other end of the capacitor C3 is grounded.
Preferably, the high-side load voltage acquisition circuit module further comprises a third filter circuit; the analog-digital conversion input end of the control chip is connected in parallel between the resistor R4 and the anode of the diode D2 through the third filter circuit.
Preferably, the third filter circuit includes a resistor R6, a resistor R7 and a capacitor C4; the analog-to-digital conversion input end of the control chip is connected in parallel between the resistor R4 and the anode of the diode D2 through the resistor R6; the capacitor C4 and the resistor R7 are connected between the analog-digital conversion input end of the control chip and the resistor R6 in parallel, and the other ends of the capacitor C4 and the resistor R7 are grounded.
Preferably, the transistor may employ other electronic components having a switching function.
Preferably, the triode and the second filter circuit can be replaced by other switch circuits.
From the above, the technical scheme provided by the invention can obtain the following beneficial effects:
the control circuit provided by the invention has fewer modules and fewer elements, so that whether the high-side load is open or not can be detected through a relatively simple circuit, the cost is reduced, and the anti-interference performance of the circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a specific circuit diagram of a control circuit in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
It should be emphasized that the control circuit in this embodiment is not applied to the field of automobile meter control only.
When the existing automobile combination instrument detects a high-side load open circuit, the existing automobile combination instrument can only detect the open circuit through a specific module, so that the problems of more circuit elements, more complicated circuits, higher cost and poorer anti-interference performance are caused.
As shown in fig. 1, in order to solve the above-mentioned problems, the present embodiment provides an automobile combination meter control circuit capable of detecting a high-side load open circuit, which mainly includes a control chip 31, a driver chip, a high-side load RL and a triode; the first input/output port (i.e. GPIO 1) of the control chip 31 is connected with the base electrode of the triode, the emitter electrode is connected with the power VCC, and the collector electrode is connected with the high-side load RL and the analog-digital conversion input end (i.e. ADC) of the access control chip 31; the second input/Output port (i.e., GPIO 2) of the control chip 31 is connected to the enable terminal (i.e., EN terminal) of the driver chip, and the Output terminal (i.e., output terminal) of the driver chip is connected to the high-side load RL.
In this embodiment, when detecting whether the high-side load RL is open, the controllable chip 31 receives the low level from the enable end of the driver chip and controls the high-side load RL to stop working, and the first input/output port of the controllable chip 31 outputs the low level, the triode is turned on, and if the voltage value of the analog-to-digital conversion input end of the controllable chip 31 is detected to be greater than the open threshold, the high-side load RL is judged to be open, otherwise, when detecting a smaller voltage value, the high-side load RL is judged to be not open.
More specifically, the high-side load voltage acquisition circuit also comprises a high-side drive control circuit module, a voltage source switch control circuit module and a high-side load voltage acquisition circuit module; the high-side drive control circuit module comprises a driver chip and a high-side load RL which are electrically connected; the voltage source switch control circuit module comprises a triode; the high side load voltage acquisition circuit module includes a control chip 31.
In the embodiment, the combined instrument control circuit is divided into three circuit modules with different functions, so that the number of the modules of the high-side load detection circuit can be reduced, the complexity of the circuit is further reduced, and the anti-interference performance is improved.
More specifically, the high-side driving control circuit further includes a first filter circuit and a diode D1; the second input/output port of the control chip 31 is connected in series with the first filter circuit and then is connected to the enabling end of the driver chip; the diode D1 is disposed between the output terminal of the driver chip and the high-side load RL, and the anode of the diode D1 is connected to the output terminal of the driver chip.
The first filter circuit comprises a resistor R1, a resistor R2 and a capacitor C1; the second input/output port of the control chip 31 is connected in series with the resistor R1 and then connected to the enable end of the driver chip, and the resistor R2 and one end of the capacitor C1 are connected in parallel between the resistor R1 and the enable end of the driver chip, and the other ends of the resistor R2 and the capacitor C1 are grounded.
More specifically, the voltage source switch control circuit module includes a second filter circuit, a resistor R3, a resistor R4, a capacitor C2, and a diode D2; the first input/output port of the control chip 31 is connected in series with the second filter circuit and then connected to the base electrode of the triode; the power supply VCC is connected with a capacitor C2, a resistor R3 and an emitter of a triode in parallel, the other end of the capacitor C2 is grounded, and the other end of the resistor R3 is connected with a second filter circuit; the collector of the triode is connected in series with the resistor R4 and the diode D2, then is connected in parallel between the cathode of the diode D1 and the high-side load RL, and the anode of the diode D2 is connected with the resistor R4.
The second filter circuit comprises a resistor R5 and a capacitor C3; one end of the resistor R5 is connected with the first input/output port of the control chip 31, and the other end is connected with the capacitor C3, the base electrode of the triode and the resistor R3 in parallel; the other end of the resistor C3 is grounded.
More specifically, the high-side load voltage acquisition circuit module further comprises a third filter circuit; the analog-digital conversion input end of the control chip 31 is connected in parallel between the resistor R4 and the anode of the diode D2 through a third filter circuit.
More specifically, the third filter circuit includes a resistor R6, a resistor R7, and a capacitor C4; the analog-digital conversion input end of the control chip 31 is connected in parallel between the resistor R4 and the anode of the diode D2 through the resistor R6; a capacitor C4 and a resistor R7 are connected in parallel between the analog-digital conversion input end of the control chip 31 and the resistor R6, and the other ends of the capacitor C4 and the resistor R7 are grounded.
In this embodiment, when the high-side load RL works normally, if the control chip 31 receives a command to turn on the high-side driver load RL, a high-level signal is output through the GPIO2 pin, and the signal passes through the first filter circuit formed by R1, R2 and C1 and then is input to the EN pin of the driver chip, where the EN pin is at a high level, so that the driver chip starts to work normally, and then the output end outputs a high level, and after passing through the diode D1, the high-side load RL starts to work normally; meanwhile, the GPIO1 pin of the control chip 31 outputs a high-level signal, and the high-level signal is firstly transmitted through a second filter circuit formed by R5 and C3 and then is input to the base electrode of the triode Q1, so that the triode Q1 is not conducted.
In this embodiment, when the high-side load is disabled, the control chip 31 outputs a low-level signal through the GPIO2 pin when receiving a command to turn off the high-side driver load, the signal is first passed through the first filter circuit formed by R1, R2 and C1 and then is input to the EN pin of the driver chip, at this time, the EN pin is at a low level, so that the driver chip stops working, then the output end of the driver chip outputs a low level, and after passing through the diode D1, the high-side load RL starts to stop working; meanwhile, the GPIO1 pin of the control chip 31 outputs a high-level signal, and the high-level signal is firstly input to the base electrode of the triode Q1 through a second filter circuit consisting of R5 and C3, so that the triode Q1 is not conducted.
In this embodiment, in order to detect an open circuit of the high-side load, when the automobile combination meter works, the control chip 31 outputs a low-level signal through the GPIO2 pin, the signal is first passed through the first filter circuit formed by R1, R2 and C1 and then is input to the EN pin of the driver chip, at this time, the EN pin is at a low level, so that the driver chip stops working, then the output end of the driver chip outputs a low level, and after passing through the diode D1, the high-side load RL starts to stop working; then the GPIO1 pin of the control chip 31 outputs a low-level signal, and the signal is firstly passed through a second filter circuit formed by R5 and C3 and then is input into the base electrode of the triode Q1, so that the triode Q1 is conducted; if the high-side load RL is not open, the power supply VCC generates a partial voltage on the anode of the D2 after passing through the triode and the resistor R4, the voltage signal is input to the ADC pin of the control chip 31 after passing through the third filter circuit consisting of R6, R7 and C4, and the control chip 31 detects that the voltage value of the pin is smaller, so that the high-side load RL is judged to be not open; if the high side load RL is open, which is equivalent to RL being infinity, the voltage on the anode of D2 is larger, and the voltage value of the ADC pin detected by the control chip 31 will be larger, so that it can be determined that the high side load RL is open.
In the present embodiment, a PNP transistor is used, but it is not limited thereto, and other electronic components with switching function, such as MOS transistors, junction field effect transistors, or electronic tubes, may be used instead.
Preferably, but not limited to, the transistor and the second filter circuit may be replaced by other switching circuits, such as integrated circuits, or other forms of switching circuits.
In summary, in the automobile combination meter control circuit capable of detecting the open circuit of the high-side load provided by the embodiment, the simple circuit is adopted to realize the detection process of the high-side load, so that the circuit cost is reduced, and the anti-interference performance of the circuit is improved.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (10)
1. An automobile combination instrument control circuit capable of detecting a high-side load open circuit is characterized in that: the high-side load circuit comprises a control chip, a driver chip, a high-side load RL and a triode; the first input/output port of the control chip is connected with the base electrode of the triode, the emitter electrode of the control chip is connected with a power supply VCC, and the collector electrode of the control chip is connected with the high-side load RL and the analog-to-digital conversion input end of the control chip in parallel; the second input/output port of the control chip is connected with the enabling end of the driver chip, and the output end of the driver chip is connected with the high-side load RL;
when the control chip enables the second input/output port to output low level, the enabling end of the driver chip receives low level and controls the high-side load RL to stop working, meanwhile, the first input/output port of the control chip outputs low level, the triode is conducted, and at the moment, if the analog-to-digital conversion input end of the control chip detects that the voltage value is larger than the open circuit threshold value, the high-side load RL is judged to be open circuit.
2. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 1, wherein: the high-side load voltage acquisition circuit comprises a high-side drive control circuit module, a voltage source switch control circuit module and a high-side load voltage acquisition circuit module; the high-side drive control circuit module comprises the driver chip and a high-side load RL which are electrically connected; the voltage source switch control circuit module comprises the triode; the high-side load circuit acquisition circuit module comprises the control chip.
3. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 2, wherein: the high-side driving control circuit module further comprises a first filter circuit and a diode D1; the second input/output port of the control chip is connected in series with the first filter circuit and then is connected to the enabling end of the driver chip; the diode D1 is arranged between the output end of the driver chip and the high-side load RL, and the anode of the diode D1 is connected with the output end of the driver chip.
4. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 3, wherein: the first filter circuit comprises a resistor R1, a resistor R2 and a capacitor C1; the second input/output port of the control chip is connected in series with the resistor R1 and then connected to the enabling end of the driver chip, the resistor R1 and the enabling end of the driver chip are connected in parallel with one end of the resistor R2 and one end of the capacitor C1, and the other ends of the resistor R2 and the capacitor C1 are grounded.
5. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 4, wherein: the voltage source switch control circuit module comprises a second filter circuit, a resistor R3, a resistor R4, a capacitor C2 and a diode D2; the first input/output port of the control chip is connected with the second filter circuit in series and then connected with the base electrode of the triode; the power supply VCC is connected with the capacitor C2, the resistor R3 and the emitting electrode of the triode in parallel, the other end of the capacitor C2 is grounded, and the other end of the resistor R3 is connected into the second filter circuit; the collector of the triode is connected in series with the resistor R4 and the diode D2, then is connected between the cathode of the diode D1 and the high-side load RL in parallel, and the anode of the diode D2 is connected with the resistor R4.
6. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 5, wherein the automobile combination meter control circuit is characterized in that: the second filter circuit comprises a resistor R5 and a capacitor C3; one end of the resistor R5 is connected with the first input/output port of the control chip, and the other end of the resistor R5 is connected with the capacitor C3, the base electrode of the triode and the resistor R3 in parallel; the other end of the capacitor C3 is grounded.
7. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 6, wherein: the high-side load voltage acquisition circuit module further comprises a third filter circuit; the analog-digital conversion input end of the control chip is connected in parallel between the resistor R4 and the anode of the diode D2 through the third filter circuit.
8. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to claim 7, wherein: the third filter circuit comprises a resistor R6, a resistor R7 and a capacitor C4; the analog-to-digital conversion input end of the control chip is connected in parallel between the resistor R4 and the anode of the diode D2 through the resistor R6; the capacitor C4 and the resistor R7 are connected between the analog-digital conversion input end of the control chip and the resistor R6 in parallel, and the other ends of the capacitor C4 and the resistor R7 are grounded.
9. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to any one of claims 1 to 8, wherein: the transistor may employ other electronic components having switching functions.
10. The automobile combination meter control circuit capable of detecting a high-side load open circuit according to any one of claims 1 to 8, wherein: the triode and the second filter circuit can be replaced by other switch circuits.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011094206.7A CN112455366B (en) | 2020-10-14 | 2020-10-14 | Automobile combination instrument control circuit capable of detecting high-side load open circuit |
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| CN202011094206.7A CN112455366B (en) | 2020-10-14 | 2020-10-14 | Automobile combination instrument control circuit capable of detecting high-side load open circuit |
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| CN112455366B true CN112455366B (en) | 2023-05-16 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204241613U (en) * | 2014-12-19 | 2015-04-01 | 惠州市德赛西威汽车电子有限公司 | A kind of load open-circuit detection circuit |
| CN108382324A (en) * | 2018-01-18 | 2018-08-10 | 沈阳中科唯电子技术有限公司 | A kind of low-power consumption entire car controller of integrated gateway function |
| 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 |
-
2020
- 2020-10-14 CN CN202011094206.7A patent/CN112455366B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204241613U (en) * | 2014-12-19 | 2015-04-01 | 惠州市德赛西威汽车电子有限公司 | A kind of load open-circuit detection circuit |
| CN108382324A (en) * | 2018-01-18 | 2018-08-10 | 沈阳中科唯电子技术有限公司 | A kind of low-power consumption entire car controller of integrated gateway function |
| 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 |
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