CN220188618U - Voltage detection device and heater controller - Google Patents
Voltage detection device and heater controller Download PDFInfo
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Abstract
The utility model provides a voltage detection device and a heater controller, which relate to the technical field of automatic control and comprise a comparator module and a conversion module; the comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal, and the slopes of the rising edge and the falling edge of the oscillation signal are not 0; the conversion module is used for converting the pulse width modulation signal into a voltage signal, wherein the comparator module comprises a first comparison circuit and a second comparison circuit; the first comparison circuit is used for comparing and generating an oscillation signal; the second comparison circuit is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal; according to the embodiment of the utility model, the voltage detection signal is compared with the oscillation signal through the comparator to generate the pulse width modulation signal, and the conversion module is used for converting the pulse width modulation signal into the voltage signal, so that the problem that the high-voltage side single MCU unit cannot realize voltage detection through low cost in the prior art is solved.
Description
Technical Field
The utility model relates to the technical field of automatic control, in particular to a voltage detection device and a heater controller.
Background
In the prior art, an automobile heater controller basically adopts a double MCU architecture, and is mainly responsible for acquiring and converting a whole automobile signal, such as CAN/LIN, into other serial communication, and transmitting the whole automobile signal to a Slave MCU through a digital isolator, and meanwhile, the Slave MCU acquires a low-voltage signal through an integrated chip, so that in the double MCU architecture, the information processed by the Master MCU is not much, and the waste of resources and cost is caused.
Furthermore, as one-step whole car signals are required to be converted into other serial communication, the processing efficiency of the whole car signals is greatly reduced.
In the prior art, the processing efficiency of the whole vehicle signal is greatly improved or the resource cost is saved, the data communication can be realized through the Slave MCU, however, the acquisition of the low-voltage signal is usually removed on the basis of considering the cost, namely in the prior art, the low-voltage detection cannot be realized through the low cost through the high-voltage side single-side MCU architecture.
Disclosure of Invention
The embodiment of the utility model aims to provide a voltage detection device and a heater controller, which are used for providing voltage detection for a high-voltage side single-side MCU framework and reducing detection cost.
In a first aspect, a voltage detection apparatus includes:
a comparator module and a conversion module;
the comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal, wherein the slope of the rising edge and the falling edge of the oscillation signal is not 0;
the conversion module is used for converting the pulse width modulation signal into a voltage signal.
Preferably, the comparator module comprises:
a first comparison circuit and a second comparison circuit;
the first comparison circuit is used for comparing and generating an oscillation signal;
the second comparison circuit is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal.
Preferably, the periodic signal includes a triangular wave signal, a sinusoidal wave signal, or a sawtooth wave signal.
Preferably, the first comparing circuit comprises a first comparator, a voltage dividing sub-circuit and an RC sub-circuit;
the first end of the voltage dividing sub-circuit and the first end of the RC sub-circuit are respectively connected with a power supply, and the second end of the voltage dividing sub-circuit is connected with the non-inverting input end of the first comparator; the inverting input end of the first comparator is respectively connected with the output end of the first comparator, the second end of the RC sub-circuit and the inverting output end of the second comparison circuit; the inverting input of the first comparator is used for providing a periodic signal for the low-voltage detection device.
Preferably, the voltage divider sub-circuit includes: a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor and the first end of the third resistor are respectively connected with a power supply; the second end of the third resistor is respectively connected with the first end of the second resistor, the first end of the RC subcircuit and the output end of the first comparator; the second end of the first resistor is connected with the second end of the second resistor and the first end of the first comparator respectively, and is connected to the ground through the fourth resistor.
Preferably, the RC sub-circuit comprises a fifth resistor and a first capacitor;
the first end of the fifth resistor is connected with the first end of the voltage divider circuit and the power supply respectively; the second end of the fifth resistor is connected with the inverting input end of the first comparator and is connected to the bottom through the first capacitor.
Preferably, the second comparing circuit includes a second comparator and a detection sub-circuit;
the non-inverting input end of the second comparator is connected with one end of the detection subcircuit; the other end of the detection subcircuit is connected with a voltage detection signal; the inverting input end of the second comparator is connected with the second end of the first comparison circuit; the output end of the second comparator is connected with the conversion module.
Preferably, the detection sub-circuit includes a seventh resistor and an eighth resistor;
one end of the seventh resistor connected in series with the eighth resistor is connected with a voltage detection signal, and the other end of the seventh resistor is grounded; and a connecting point between the seventh resistor and the eighth resistor is connected with the non-inverting input end of the second comparator.
Preferably, the second comparing circuit further includes a ninth resistor;
one end of the ninth resistor is connected with the output end of the second comparator; the other end of the ninth resistor is connected with a power supply and the positive input end of the second comparator respectively.
In a second aspect, a heater controller includes: a high-side single MCU unit and a voltage detection device according to any of the above first aspects.
The voltage detection device and the heater controller provided by the utility model have the following beneficial effects:
the device comprises a comparator module and a conversion module; the comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal, and the slopes of the rising edge and the falling edge of the oscillation signal are not 0; the conversion module is used for converting the pulse width modulation signal into a voltage signal, wherein the comparator module comprises a first comparison circuit and a second comparison circuit; the first comparison circuit is used for comparing and generating an oscillation signal; the second comparison circuit is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal; according to the embodiment of the utility model, the voltage detection signal is compared with the oscillation signal through the comparator to generate the pulse width modulation signal, and the conversion module is used for converting the pulse width modulation signal into the voltage signal, so that the problem that the high-voltage side single MCU unit cannot realize voltage detection through low cost in the prior art is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a system architecture of a voltage detection device according to an embodiment of the present utility model;
FIG. 2 is a second system configuration diagram of a voltage detection device according to an embodiment of the present utility model;
FIG. 3 is a third system configuration diagram of a voltage detection device according to an embodiment of the present utility model;
FIG. 4 is a diagram showing a system configuration of a voltage detection device according to an embodiment of the present utility model;
FIG. 5 is a diagram showing a system configuration of a voltage detection device according to an embodiment of the present utility model;
FIG. 6 is a diagram showing a system configuration of a voltage detection device according to an embodiment of the present utility model;
FIG. 7 is a diagram of a system configuration of a voltage detection device according to an embodiment of the present utility model;
FIG. 8 is a diagram illustrating a system configuration of a voltage detection device according to an embodiment of the present utility model;
fig. 9 is a system configuration diagram of a voltage detection device according to an embodiment of the present utility model.
Icon: 100-voltage detection means; 11-a comparator module; a 12-conversion module; 101-a first comparison circuit; 102-a second comparison circuit.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
In the prior art, an automobile heater controller basically adopts a double MCU architecture, and is mainly responsible for acquiring and converting a whole automobile signal, such as CAN/LIN, into other serial communication, and transmitting the whole automobile signal to a Slave MCU through a digital isolator, and meanwhile, the Slave MCU acquires a low-voltage signal through an integrated chip, so that in the double MCU architecture, the information processed by the Master MCU is not much, and the waste of resources and cost is caused. However, the whole car signal needs to be converted into other serial communication by one step, so that the processing efficiency of the whole car signal is greatly reduced.
According to research of the inventor, in order to improve the processing efficiency of the whole vehicle signal or save the resource cost, data communication can be realized through a Slave MCU, but on the basis, the low-cost low-voltage detection can not be realized through a high-voltage single-side MCU architecture.
Therefore, the embodiment of the utility model provides a voltage detection device and heater controller, accessible comparator with voltage detection signal with oscillation signal comparison generate pulse width modulation signal, PWM signal promptly, conversion module is used for converting PWM signal into voltage signal, has solved the problem that high-pressure side single MCU unit can't realize voltage detection through the low cost among the prior art.
In a first aspect, fig. 1 is a voltage detection apparatus 100 according to an embodiment of the present utility model, including:
a comparator module 11 and a conversion module 12; the comparator module 11 is configured to compare the voltage detection signal with the oscillation signal to generate a pulse width modulation signal, where the rising edge and the falling edge of the oscillation signal have slopes different from 0;
in one achievable embodiment, the periodic signal comprises a triangular wave signal, a sinusoidal wave signal or a sawtooth wave signal.
In one possible embodiment, the comparator module 11 comprises:
a first comparison circuit 101 and a second comparison circuit 102; wherein the first comparing circuit 101 is configured to compare and generate an oscillation signal; the second comparing circuit 102 is configured to compare the voltage detection signal with the oscillation signal to generate a pulse width modulation signal.
As shown in fig. 2, in one possible embodiment, the comparator module 11 further comprises a sixth resistor R6; one end of the sixth resistor R6 is connected to the non-inverting input terminal of the first comparator 101, and the other end is connected to the inverting input terminal of the second comparator.
In another embodiment, the comparator module 11 may further include a two-way comparator, for example, a comparator U8A and a comparator U8B, where the comparator U8A corresponds to a first comparator for comparing to generate the oscillation signal and the comparator U8B corresponds to a second comparator for comparing the voltage detection signal to the oscillation signal to generate the pulse width modulation signal.
As shown in fig. 3, in one possible embodiment, the first comparison circuit 101 includes a first comparator, a voltage divider sub-circuit, and an RC sub-circuit;
the first end of the voltage divider circuit and the first end of the RC sub-circuit are respectively connected with a power supply VCC, and the second end of the voltage divider circuit is connected with the non-inverting input end of the first comparator; the inverting input end of the first comparator is respectively connected with the output end of the first comparator, the second end of the RC sub-circuit and the first end of the second comparison circuit; the first comparator is used for generating an oscillation signal according to the comparison of the voltage dividing sub-circuit and the electric signal generated by the RC sub-circuit.
As shown in fig. 4, in one possible embodiment, the voltage divider circuit includes: a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
the first end of the first resistor R1 and the first end of the third resistor R3 are respectively connected with a power supply VCC; the second end of the third resistor R3 is respectively connected with the first end of the second resistor R2, the first end of the RC sub-circuit and the output end of the first comparator; the second end of the first resistor R1 is connected to the second end of the second resistor R2 and the first end of the first comparator, respectively, and is connected to ground through the fourth resistor R4.
As shown in fig. 5, in one possible embodiment, the RC sub-circuit includes a fifth resistor R5, a first capacitor C1;
the first end of the fifth resistor R5 is connected with the first end of the voltage divider circuit and the power supply VCC respectively; the second terminal of the fifth resistor R5 is connected to the inverting input terminal of the first comparator and to the bottom through the first capacitor C1.
According to the above circuit connection relationship, the first comparison circuit 101 operates as follows:
the voltage of the non-inverting input end of the first comparator, namely the voltage on the third pin, is determined by the voltage dividing circuit and the output end of the comparator; the voltage at the inverting input of the first comparator, i.e., the voltage at the second pin, is determined by the output of the comparator and the RC subcircuit.
When the output end of the first comparator outputs high level, the second resistor R2 is connected in parallel between the output end of the first comparator and the normal phase input end of the first comparator, and is equivalent to one end of the second resistor R2 connected with 5V to participate in voltage division, and the voltage of the normal phase input end of the first comparator is at a high point, then the voltage of the reverse phase input end of the first comparator charges the first capacitor C1 through the fifth resistor R5 in the RC sub-circuit, so that the voltage of the reverse phase input end of the first comparator is gradually increased; when the voltage of the inverting input end of the first comparator is larger than the voltage of the non-inverting input end of the first comparator, the output end of the comparator turns to be a low point, and then the second resistor R2 is equivalent to the fact that one end of the second resistor is grounded to participate in voltage division, wherein the voltage of the non-inverting input end of the first comparator is at the low point, the voltage of the inverting input end of the first comparator discharges the first capacitor C1 through the fifth resistor R5 in the RC sub-circuit, so that the voltage of the inverting input end of the first comparator gradually decreases, and the voltage slowly decreases; when the voltage of the inverting input end of the first comparator is smaller than the voltage of the non-inverting input end of the first comparator, the output end of the comparator turns to a high point; the circuit is cycled in such a way that the first comparator circuit can generate a triangular wave signal and an oscillating signal is transferred to the second comparator circuit via the inverting input of the first comparator, and the oscillating signal oscillates between the product of the value of the fifth resistor R5 and the first capacitor C1.
In another embodiment, if the second comparator is to generate the PWM signal by comparing the other oscillation signal with the voltage detection signal, the first comparison circuit may be replaced by another oscillation signal generating circuit, such as a sine wave signal or a saw tooth wave signal, as long as the oscillation signal satisfies a periodic waveform with a slope of the rising edge and the falling edge other than 0 or ±infinity.
As shown in fig. 6, in one possible embodiment, the second comparison circuit 102 includes a second comparator and a detection subcircuit;
the non-inverting input end of the second comparator is connected with one end of the detection subcircuit; the other end of the detection sub-circuit is connected with a voltage detection signal; the inverting input end of the second comparator is connected with the second end of the first comparison circuit; the output end of the second comparator is connected with the conversion module;
the second comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal.
In this embodiment, the second comparator is configured to compare the voltage detection signal with the triangular wave signal to generate a pulse width modulation signal, and specifically, an inverting input end of the second comparator receives the triangular wave signal transmitted by the first comparator, a non-inverting input end of the second comparator receives the low voltage signal to be detected, and the second comparator outputs the PWM signal by comparing the input low voltage signal to be detected with the triangular wave signal.
As shown in fig. 7, in one embodiment, the detection sub-circuit includes a seventh resistor R7 and an eighth resistor R8; one end of the resistor R7 and one end of the eighth resistor R8 which are connected in series are connected with a voltage detection signal, and the other end of the resistor R7 is grounded; the connection point of the seventh resistor R7 and the eighth resistor R8 is connected with the non-inverting input end of the second comparator; wherein the time decay and the temperature decay are compensated for by the voltage division between the seventh resistor R7 and the eighth resistor R8.
As shown in fig. 8, in one possible embodiment, the second comparing circuit 102 further includes a ninth resistor R9;
one end of the ninth resistor R9 is connected with the output end of the second comparator; the other end of the ninth resistor R9 is connected with a power supply and the positive input end of the second comparator respectively.
In another possible embodiment, as shown in fig. 8, the second comparing circuit 102 further comprises a second capacitor C2; one end of the second capacitor C2 is connected to the power supply VCC and the positive input end of the second comparator, respectively, and is used for filtering the voltage input to the second comparator.
The conversion module is used for converting the pulse width modulation signal into a voltage signal.
In one embodiment, the conversion module may obtain the values of the duty ratio of the PWM signal and the voltage signal corresponding to each other by burning and storing the conversion table of the PWM signal and the voltage signal, that is, by looking up a table in the conversion module, and in this embodiment, the conversion module is not limited to the burned conversion table, as long as the PWM signal can be converted into the voltage signal by simply looking up a table.
In another embodiment, the voltage detection apparatus 100 further includes an isolation unit disposed between the comparator module and the conversion module, for isolating the PWM signal, which is the PWM signal, output by the comparator module onto the high-voltage side MCU, and on this basis, the isolation module may be selected as a digital isolation module, so as to reduce the cost of the high-voltage side single MCU unit for performing the voltage detection.
A specific circuit simulation experiment is provided in this experimental embodiment.
Wherein, power supply VDD is 5V, and the resistance values of first resistance R1, second resistance R2, third resistance R3, fourth resistance R4 in the voltage divider circuit are respectively: 68kΩ, 10kΩ, 68kΩ; the resistance value of a fifth resistor R5 in the RC sub-circuit is 27kΩ, and the capacitance value of the first capacitor C1 is 1000nF; the resistance values of a seventh resistor R7 and an eighth resistor R8 in the detection sub-circuit are 68kΩ and 10kΩ respectively; wherein, a relation table as shown in Table 1 is obtained;
TABLE 1
Wherein IGN is a voltage detection signal.
As can be seen from table 1, as the voltage of the voltage detection signal increases, the PWM duty ratio is higher. Therefore, after the duty ratio signal is obtained, the conversion device performs the look-up table of the duty ratio signal, and reads the voltage information, so that the voltage conversion of the voltage detection signal can be realized.
As shown in fig. 9, the voltage detection circuit provided in this embodiment includes a comparator module and a conversion module; the comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal, and the slopes of the rising edge and the falling edge of the oscillation signal are not 0; the conversion module is used for converting the pulse width modulation signal into a voltage signal, wherein the comparator module comprises a first comparison circuit and a second comparison circuit; the first comparison circuit is used for comparing and generating an oscillation signal; the second comparison circuit is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal; according to the embodiment of the utility model, the voltage detection signal is compared with the oscillation signal through the comparator to generate the pulse width modulation signal, and the conversion module is used for converting the pulse width modulation signal into the voltage signal, so that the problem that the high-voltage side single MCU unit cannot realize voltage detection through low cost in the prior art is solved.
In a second aspect, a heater controller includes: a high-side single MCU unit and the voltage detection device 100 of any one of the above first aspects.
If the high-voltage side single MCU unit includes an MCU, the MCU can replace a conversion module in the voltage detection device 100, i.e. directly through burning, to store the pwm signal and the voltage signal conversion table, so that the voltage signal can be read directly through the MCU look-up table.
The heater controller provided in this embodiment includes all the technical means and technical effects described in the first aspect.
In the description of the present utility model, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put in use of the product of this application, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
It should also be noted that the terms "disposed," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically defined and limited; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The above description is only an example of the present utility model and is not intended to limit the scope of the present utility model, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. A voltage detection device, comprising:
a comparator module and a conversion module;
the comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal, wherein the slope of the rising edge and the falling edge of the oscillation signal is not 0;
the conversion module is used for converting the pulse width modulation signal into a voltage signal.
2. The voltage detection apparatus according to claim 1, wherein the comparator module includes:
a first comparison circuit and a second comparison circuit;
the first comparison circuit is used for comparing and generating an oscillation signal;
the second comparison circuit is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal.
3. The voltage detection apparatus according to claim 1, wherein the oscillation signal includes a triangular wave signal, a sinusoidal wave signal, or a sawtooth wave signal.
4. The voltage detection apparatus according to claim 2, wherein the first comparison circuit includes a first comparator, a voltage dividing sub-circuit, an RC sub-circuit;
the first end of the voltage dividing sub-circuit and the first end of the RC sub-circuit are respectively connected with a power supply, and the second end of the voltage dividing sub-circuit is connected with the non-inverting input end of the first comparator; the inverting input end of the first comparator is respectively connected with the output end of the first comparator, the second end of the RC sub-circuit and the first end of the second comparison circuit; the first comparator is used for generating an oscillating signal according to the comparison of the voltage dividing sub-circuit and the electric signal generated by the RC sub-circuit.
5. The voltage detection apparatus according to claim 4, wherein the voltage dividing sub-circuit includes: a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor and the first end of the third resistor are respectively connected with a power supply; the second end of the third resistor is respectively connected with the first end of the second resistor, the first end of the RC subcircuit and the output end of the first comparator; the second end of the first resistor is connected with the second end of the second resistor and the first end of the first comparator respectively, and is connected to the ground through the fourth resistor.
6. The voltage detection device of claim 4, wherein the RC subcircuit comprises a fifth resistor, a first capacitor;
the first end of the fifth resistor is connected with the first end of the voltage divider circuit and the power supply respectively; the second end of the fifth resistor is connected with the inverting input end of the first comparator and is connected to the bottom through the first capacitor.
7. The voltage detection apparatus according to claim 2, wherein the second comparison circuit includes a second comparator and a detection sub-circuit;
the non-inverting input end of the second comparator is connected with one end of the detection subcircuit; the other end of the detection subcircuit is connected with a voltage detection signal; the inverting input end of the second comparator is connected with the second end of the first comparison circuit; the output end of the second comparator is connected with the conversion module;
the second comparator is used for comparing the voltage detection signal with the oscillation signal to generate a pulse width modulation signal.
8. The voltage detection device of claim 7, wherein the detection subcircuit includes a seventh resistor and an eighth resistor;
one end of the seventh resistor connected in series with the eighth resistor is connected with a voltage detection signal, and the other end of the seventh resistor is grounded; and a connecting point between the seventh resistor and the eighth resistor is connected with the non-inverting input end of the second comparator.
9. The voltage detection device of claim 7, wherein the second comparison circuit further comprises a ninth resistor;
one end of the ninth resistor is connected with the output end of the second comparator; the other end of the ninth resistor is connected with a power supply and the positive input end of the second comparator respectively.
10. A heater controller, comprising: high-voltage side single MCU unit and voltage detection device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321657018.XU CN220188618U (en) | 2023-06-27 | 2023-06-27 | Voltage detection device and heater controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321657018.XU CN220188618U (en) | 2023-06-27 | 2023-06-27 | Voltage detection device and heater controller |
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| CN220188618U true CN220188618U (en) | 2023-12-15 |
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| CN202321657018.XU Active CN220188618U (en) | 2023-06-27 | 2023-06-27 | Voltage detection device and heater controller |
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