CN217007453U - Voltage rapid detection circuit and electronic equipment - Google Patents
Voltage rapid detection circuit and electronic equipment Download PDFInfo
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- CN217007453U CN217007453U CN202220344272.3U CN202220344272U CN217007453U CN 217007453 U CN217007453 U CN 217007453U CN 202220344272 U CN202220344272 U CN 202220344272U CN 217007453 U CN217007453 U CN 217007453U
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Abstract
The embodiment of the utility model discloses a voltage rapid detection circuit and electronic equipment, comprising: the device comprises a conversion module, a low voltage detection circuit and a high voltage detection circuit; the low-voltage detection circuit and the high-voltage detection circuit are connected in parallel to form a parallel detection circuit; one end of the parallel detection circuit is a power supply connecting end, the other end of the parallel detection circuit is connected with the conversion module, and the other end of the conversion module is used as a feedback end and is connected with a target device; the parallel detection circuit is used for detecting whether the voltage of the connected power supply is within a preset numerical range, the conversion module is used for converting the voltage detection result of the parallel detection circuit into a level signal and feeding the level signal back to the target device, and the level signal is used for indicating the target device to execute corresponding operation. The voltage with large fluctuation of up and down is converted into stable level indication through a simple circuit, and a target device is protected.
Description
Technical Field
The utility model relates to the field of circuit control, in particular to a voltage rapid detection circuit and electronic equipment.
Background
Most vehicle-mounted entertainment system power supply high-low voltage detection circuits in the existing market give MCU's AD foot through the analog voltage after resistance voltage division, and MCU judges detection port voltage value after through inside AD conversion. The MCU scans the detection pin for a long time, and when the detection pin detects that the voltage value is lower than or higher than the rated voltage value of the design specification for 3-5 times, the MCU shuts down the machine to enable the machine to be in a dormant state. Because the current AD detection needs MCU to scan for a long time, more MCU resources need to be occupied, and the speed of processing other work by the MCU is influenced. And the voltage state of the power supply can be judged only by detecting for many times, the speed is low, and when the power supply is disconnected or dropped instantly, the MCU is easy to not memorize the state of the power supply before the power supply is disconnected or dropped instantly. In addition, if the power supply voltage is too high, when the voltage of the MCU detection port is larger than the maximum voltage which can be borne by the detection port, the risk of damaging the MCU exists.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application provides a voltage fast detection circuit, including: the device comprises a conversion module, a low voltage detection circuit and a high voltage detection circuit;
the low-voltage detection circuit and the high-voltage detection circuit are connected in parallel to form a parallel detection circuit; one end of the parallel detection circuit is a power supply connecting end, the other end of the parallel detection circuit is connected with the conversion module, and the other end of the conversion module is used as a feedback end and is connected with a target device;
the parallel detection circuit is used for detecting whether the voltage of the connected power supply is within a preset numerical range, the conversion module is used for converting the voltage detection result of the parallel detection circuit into a level signal and feeding the level signal back to the target device, and the level signal is used for indicating the target device to execute corresponding operation.
Further, the low voltage detection circuit comprises a first voltage regulator diode and a first resistor;
the anode of the first voltage stabilizing diode is connected with one end of the first resistor, the cathode of the first voltage stabilizing diode is connected with the conversion module, and the other end of the first resistor is connected with the power supply connecting end.
Further, the high voltage detection circuit comprises a second resistor, a third resistor, a second voltage stabilizing diode and a first triode;
the emitting electrode of the first triode is grounded, the collector electrode of the first triode is connected with the conversion module, and the base electrode of the first triode is connected with one end of the second resistor;
the anode of the second voltage stabilizing diode is connected with the other end of the second resistor, the cathode of the second voltage stabilizing diode is connected with one end of the third resistor, the resistance value of the second resistor is larger than that of the third resistor, and the other end of the third resistor is connected with the power supply connecting end.
Further, the conversion module comprises a second triode, a third triode, a fourth resistor and a fifth resistor;
the base electrode of the second triode is used as the first end of the conversion module and is connected with the parallel detection circuit, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is respectively connected with the base electrode of the third triode and one end of the fourth resistor;
the emitter of the third triode is grounded, and the collector of the third triode is connected with the voltage detection end of the target device;
the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with an emitting electrode of the third triode;
the other end of the fourth resistor is further used for being connected with working voltage, and the working voltage is used for supplying power to the second triode and the third triode.
And one end of the capacitor is connected with the voltage detection end of the target device, and the other end of the capacitor is grounded and used for low-pass filtering.
Further, the first triode, the second triode and the third triode are all NPN triodes.
Furthermore, the high-voltage detection circuit is also connected with a sixth resistor, one end of the sixth resistor is connected with the base electrode of the first triode, and the other end of the sixth resistor is grounded.
Furthermore, the present application also provides an electronic device, which includes a power supply, the voltage rapid detection circuit and the microcontroller, which are sequentially disposed;
the microcontroller is used for detecting the voltage condition of the power supply through the voltage quick detection circuit.
Further, the microcontroller is also used for controlling the equipment to be in a working state when the voltage rapid detection circuit outputs a high-level signal;
the microcontroller is further configured to switch the device to a sleep state when the voltage fast detection circuit outputs a low level signal.
Further, the electronic device is a vehicle-mounted entertainment device.
The embodiment of the utility model discloses a voltage rapid detection circuit and electronic equipment, comprising: the device comprises a conversion module, a low voltage detection circuit and a high voltage detection circuit; the low-voltage detection circuit and the high-voltage detection circuit are connected in parallel to form a parallel detection circuit; one end of the parallel detection circuit is a power supply connecting end, the other end of the parallel detection circuit is connected with the conversion module, and the other end of the conversion module is used as a feedback end and is connected with a target device; the conversion module is used for converting a voltage detection result of the parallel detection circuit into a level signal and feeding the level signal back to the target device, wherein the level signal is used for indicating the target device to execute corresponding operation. The voltage with large fluctuation of up and down is converted into stable level indication through a simple circuit, thereby protecting a target device and reducing the scanning operation of power supply voltage.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 shows a schematic structural diagram of a voltage fast detection circuit according to an embodiment of the present application;
fig. 2 shows a circuit diagram of a voltage fast detection circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
The technical solution of the present application is explained with specific examples.
Fig. 1 is a schematic structural diagram of a voltage fast detection circuit according to an embodiment of the present disclosure.
The fast voltage detection circuit of the present embodiment includes a low voltage detection circuit 100, a high voltage detection circuit 200 and a conversion module 300.
The low voltage detection circuit 100 and the high voltage detection circuit 200 are connected in parallel, one end of the parallel detection circuit formed by the two is connected to the conversion module 300, the other end of the parallel detection circuit is used for connecting to a power supply, and the other end of the conversion module 300 is used for connecting to a target device, such as a microcontroller.
The low voltage detection circuit 100 and the high voltage detection circuit 200 in fig. 1 can detect the voltage connected on the right side through the configuration of their own circuits, and feed back the detection state to the conversion module 300, and the conversion module 300 converts the voltage detection result of the parallel detection circuit into a level signal for feeding back to the target device, where the level signal is used to instruct the target device to perform a corresponding operation.
The target device is a Microcontroller (MCU), and the microcontroller controls the corresponding system of the equipment to be in a working state or a dormant state according to the difference of high and low level signals obtained by feedback.
The specific details of each circuit structure may be understood with reference to the circuit diagram shown in fig. 2.
The conversion module 300 of the embodiment of the present application includes a second transistor Q2, a third transistor Q3, a fourth resistor R4, and a fifth resistor R5;
the base of the second triode Q2 is used as the first end of the conversion module and is connected with the parallel detection circuit, the emitter is grounded, the collector is respectively connected with the base of the third triode Q3 and one end of the fourth resistor R4, the fourth resistor R4 is used as the pull-up resistor of the base of Q3 and is connected with a working voltage, and the working voltage is used for supplying power to the second triode and the third triode, in this embodiment, the working voltage can be selected to be 3.3 v; the emitting electrode of the third triode Q3 is grounded, and the collector electrode of the third triode Q3 is connected with the MCU; the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the emitter of the third Q3 diode.
When the voltage of a general vehicle-mounted entertainment system is lower than 7.8V, the supply voltage is insufficient, and the vehicle-mounted entertainment system cannot work normally, and when the voltage is higher than 17.2V, the danger of damaging electronic components is caused.
Therefore, for the switching module 300, when the power voltage is lower than 7.8V or higher than 17.2V, as long as the voltage at the point C does not satisfy the conduction condition of the second diode Q2, the point D in the switching module 300 gets a high level because of the R4, so that the third transistor Q3 is turned on, and therefore the voltage at the point E is pulled down to 0, so that the switching module 300 outputs a low level to the MCU, and the MCU controls the in-vehicle entertainment system to enter the sleep state when detecting the low level.
When the power voltage is between 7.8V and 17.2V, the voltage at the point C is made to satisfy the conduction condition of the second diode Q2, and when the second diode is conducted, the voltage at the point D is pulled down to 0 because the second diode Q2 is grounded, so that the third transistor Q3 is not conducted, and the voltage at the point E is pulled up to obtain a high level because the fifth resistor R5 is pulled up, so that the conversion module 300 outputs the high level to the MCU, and the MCU detects the high level to keep the in-vehicle entertainment system in an active state.
The low-voltage detection circuit 100 comprises a first voltage-stabilizing diode Z1 and a first resistor R1 which are connected in series, wherein the anode of the first voltage-stabilizing diode Z1 is connected with one end of a first resistor R1, the cathode of the first voltage-stabilizing diode Z1 is connected with a conversion module, and the other end of the first resistor R1 is connected to a power supply end.
The low voltage detection circuit 100 is used to ensure that the voltage passing through the circuit is higher than a certain value, so that the voltage passing through the low voltage detection circuit 100 needs to be greater than 7.8V, when the voltage is greater than 7.8V, the second diode Q2 in the conversion module 300 is turned on, and when the voltage is less than 7.8V, the Q2 is turned off, as shown in fig. 2, all diodes are NPN type, so according to the conduction principle, as long as the point C at the low voltage is in a low voltage state, therefore, the voltage can be divided by setting the reverse voltage of the first voltage stabilizing diode Z1 and the resistance value of the first resistor R1, so that the point C at the voltage of less than 7.8V is too small.
For example, a first zener diode Z1 with a reverse voltage of 6.7V may be provided, the resistance of the first resistor R1 may be set to one kilo-ohm, so that the first resistor R1 may divide the voltage of about 0.3V to 0.4V, and the second diode Q2 with a turn-on voltage of 1V is used, so that when the voltage of the power supply drops below 7.8V, the voltage at the point C is not enough to maintain the turn-on state of the Q2, which, in combination with the operation principle of the conversion module 300 in the above embodiment, may cause the conversion module 300 to output a low level to the MCU when the voltage of the power supply is lower than 7.8V.
The high voltage detection circuit 200 comprises a second resistor R2, a third resistor R3, a second voltage stabilizing diode and a Z2 first triode Q1;
the emitting electrode of the first triode Q1 is grounded, the collector electrode of the first triode Q1 is connected with the conversion module, and the base electrode of the first triode Q1 is connected with the second resistor R2; the second resistor R2, the third resistor R3 and the second voltage-stabilizing diode Z2 are connected in series; the anode of the second zener diode Z2 is connected to the second resistor R2, the cathode thereof is connected to the third resistor R3, and the third resistor R3 is connected to the power connection terminal. The resistance of the second resistor R2 is greater than that of the third resistor R3, so as to ensure that the second zener diode can be broken down when the voltage is sufficiently large, and the second resistor R2 can also serve as a protection resistor to protect the first transistor Q1.
The high voltage detection circuit 200 is used to pull down the voltage at the point C when the voltage is too large, so that the Q2 is in a non-conducting state, but under a normal operating voltage, the voltage at the point C is kept normal, so long as the voltage at the point B is not enough to make the first transistor Q1 conducting before 17.2V, and when the voltage is higher than 17.2V, the first transistor Q1 is made conducting, so that the point C is pulled down to ground.
Specifically, a second zener diode Z2 with a reverse voltage of 16V may be provided, the second resistor R2 may be forty-seven hundred ohms, the third resistor R3 may be one kilo-ohm, and the turn-on voltage of Q1 may be 0.7V, so that R2 and R3 may approximately divide the 16.5V voltage with the second zener diode Z2 when the power voltage is 17.2V, so that when the power voltage is between 7.8 and 17.2V, the first transistor Q1 may not be turned on, and when the power voltage is about to exceed 17.2V, the voltage at point B may exceed the turn-on voltage of Q1, so that Q1 is turned on, and further, the point C is grounded, so that the voltage at point C may become a low voltage when the voltage exceeds 17.2V, so that the second diode Q2 is turned off, which meets the operation requirements of the conversion module 300.
The high voltage detection circuit 200 is further connected to a sixth resistor connected to ground, and the sixth resistor is connected to the base of the first triode.
Further, the present application also provides an electronic device, which includes a power supply, the voltage fast detection circuit and the microcontroller, which are sequentially arranged. The microcontroller is used for detecting the voltage condition of the power supply through the voltage quick detection circuit. Further, when the voltage rapid detection circuit outputs a high level, the microcontroller controls the device to be in a working state; when the voltage fast detection circuit outputs a low level, the microcontroller switches the device to a sleep state.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A circuit for rapid detection of voltage, comprising: the device comprises a conversion module, a low voltage detection circuit and a high voltage detection circuit;
the low voltage detection circuit and the high voltage detection circuit are connected in parallel to form a parallel detection circuit; one end of the parallel detection circuit is a power supply connection end, the other end of the parallel detection circuit is connected with the conversion module, and the other end of the conversion module is used as a feedback end and is connected with a target device;
the conversion module is used for converting a voltage detection result of the parallel detection circuit into a level signal and feeding the level signal back to the target device, wherein the level signal is used for indicating the target device to execute corresponding operation.
2. The voltage fast detection circuit according to claim 1, wherein the low voltage detection circuit comprises a first zener diode and a first resistor;
the anode of the first voltage stabilizing diode is connected with one end of the first resistor, the cathode of the first voltage stabilizing diode is connected with the conversion module, and the other end of the first resistor is connected with the power connection end.
3. The voltage fast detection circuit according to claim 1, wherein the high voltage detection circuit comprises a second resistor, a third resistor, a second zener diode, and a first transistor;
the emitting electrode of the first triode is grounded, the collector electrode of the first triode is connected with the conversion module, and the base electrode of the first triode is connected with one end of the second resistor;
the anode of the second voltage stabilizing diode is connected with the other end of the second resistor, the cathode of the second voltage stabilizing diode is connected with one end of the third resistor, the resistance value of the second resistor is larger than that of the third resistor, and the other end of the third resistor is connected with the power supply connecting end.
4. The circuit of claim 3, wherein the conversion module comprises a second transistor, a third transistor, a fourth resistor and a fifth resistor;
the base electrode of the second triode is used as the first end of the conversion module and is connected with the parallel detection circuit, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is respectively connected with the base electrode of the third triode and one end of the fourth resistor;
the emitter of the third triode is grounded, and the collector of the third triode is connected with the voltage detection end of the target device;
the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with an emitting electrode of the third triode;
the other end of the fourth resistor is further used for being connected with working voltage, and the working voltage is used for supplying power to the second triode and the third triode.
5. The voltage fast detection circuit according to claim 1, further comprising a capacitor, wherein one end of the capacitor is connected to the voltage detection terminal of the target device, and the other end of the capacitor is grounded for low-pass filtering.
6. The circuit of claim 4, wherein the first transistor, the second transistor, and the third transistor are NPN transistors.
7. The circuit for rapidly detecting voltage according to claim 3, wherein a sixth resistor is further connected to the high voltage detection circuit, one end of the sixth resistor is connected to the base of the first triode, and the other end of the sixth resistor is grounded.
8. An electronic device, comprising a power supply, a voltage rapid detection circuit according to any one of claims 1 to 7, and a microcontroller, which are arranged in sequence;
the microcontroller is used for detecting the voltage condition of the power supply through the voltage quick detection circuit.
9. The electronic device of claim 8, wherein the microcontroller is further configured to control the device to an operating state when the voltage fast detection circuit outputs a high level signal;
the microcontroller is further configured to switch the device to a sleep state when the voltage fast detection circuit outputs a low level signal.
10. The electronic device according to claim 8 or 9, wherein the electronic device is an in-vehicle entertainment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220344272.3U CN217007453U (en) | 2022-02-21 | 2022-02-21 | Voltage rapid detection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220344272.3U CN217007453U (en) | 2022-02-21 | 2022-02-21 | Voltage rapid detection circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217007453U true CN217007453U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220344272.3U Active CN217007453U (en) | 2022-02-21 | 2022-02-21 | Voltage rapid detection circuit and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN217007453U (en) |
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2022
- 2022-02-21 CN CN202220344272.3U patent/CN217007453U/en active Active
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