CN110123168B - Multi-gear toggle switch and circuit thereof, and multi-gear identification circuit and device - Google Patents

Multi-gear toggle switch and circuit thereof, and multi-gear identification circuit and device Download PDF

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Publication number
CN110123168B
CN110123168B CN201910466041.2A CN201910466041A CN110123168B CN 110123168 B CN110123168 B CN 110123168B CN 201910466041 A CN201910466041 A CN 201910466041A CN 110123168 B CN110123168 B CN 110123168B
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gear
pin
circuit
toggle switch
sampling
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CN110123168A (en
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刘双春
孙观福
陈培翔
魏肃
刘家斌
黄志强
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Xiamen Chipsun Science and Technology Co Ltd
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Xiamen Chipsun Science and Technology Co Ltd
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J19/00—Household machines for straining foodstuffs; Household implements for mashing or straining foodstuffs
    • A47J19/02—Citrus fruit squeezers; Other fruit juice extracting devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Electronic Switches (AREA)

Abstract

The invention provides a multi-gear toggle switch and a circuit thereof, a multi-gear identification circuit and a device, wherein the multi-gear toggle switch circuit comprises a plurality of pins which are arranged in two rows; the sampling circuit also comprises a plurality of sampling resistors connected in series; wherein: one pin of the zero gear is grounded; one pin of the first gear is grounded through a sampling resistor, and the other pin of the first gear is connected with a pin of a third gear on the same side and a connecting node of a pin of a second gear on the opposite side of the first gear is connected with the single chip microcomputer; the other pin of the third gear is grounded through two sampling resistors; and a pin of a fourth gear on the opposite side of the pin connected with the sampling resistor of the third gear is grounded through the three sampling resistors. The multi-gear toggle switch circuit provided by the invention reduces the use of connecting wires and components, has low hardware cost and simple scheme, saves cost, and solves the problem that the existing switch circuit cannot recognize multi-gear through a single connecting wire and also can wake up a circuit system.

Description

Multi-gear toggle switch and circuit thereof, and multi-gear identification circuit and device
Technical Field
The invention relates to the field of multi-gear toggle switches, in particular to a multi-gear toggle switch and a circuit thereof, and a multi-gear identification circuit and a multi-gear identification device.
Background
At present, the handheld blender is sold in the market, the juicer is basically powered by a built-in lithium battery, a circuit system is required to be in a low power consumption mode state when the blender is not used, the circuit system can be awakened and enters a normal working state through an external component when the blender is required to be used, in addition, along with the continuous change of the requirements of consumers, the functions of the blender are not limited to the on and off functions, and the differentiation of different gear levels from the off state to the highest gear level is required, so that the following two implementation schemes are adopted for the gear level differentiation in general at present for meeting the requirements:
as shown in fig. 1, one solution is that the level of the corresponding I/O port is changed when the shift switch switches the shift position, so as to determine the current shift position: in a default state, 5I/O ports of the MCU, P02/P04/P40/P41/P44, are set to be at a high level, when a toggle switch is in a 0 gear, a single chip microcomputer pin P44 is forcibly pulled to GND through a toggle switch contact elastic sheet, the level state is changed to be at a low level, a pin P44 is detected to be at a low level through software, the current gear is identified as the 0 gear, and similarly, after the toggle switch is pulled to the right for one gear (jumping to the 1 gear), the single chip microcomputer pin P02 is forcibly pulled to GND from the high level at the moment, and the software detection pin P02 is at the low level, the current gear is identified as the 1 gear; with the shifting switch being shifted to the right, the gears are sequentially changed into 2-gear, 3-gear and 4-gear, and the corresponding pins P04, P41 and P40 of the single chip microcomputer are also sequentially changed from high level to low level; the software detects the level state of the corresponding pin, identifies the current gear, and then the MCU outputs PWM (pulse width modulation) driving MOS (metal oxide semiconductor) tubes with corresponding duty ratios to carry out motor speed regulation; the gear can be judged and identified through 1 to 1I/O port level, and the method has the advantages of simple software system and convenience in software compiling. But has the following disadvantages:
1. hardware cost is high, only one gear can be identified by a single I/O, and more singlechip resources are consumed to realize gear identification, so that design material cost is increased;
2. the current gear cannot be kept in the gear shifting process, misoperation is easily triggered, and user experience is influenced;
3. the connection of the switch and the control panel needs more flat cables, on the one hand, the increase of the flat cables needs more PCB space, so that the structural appearance of the product is influenced; on the other hand, the increase of the connecting line will also lead to an increase of the material cost.
As shown in fig. 2, the other scheme is that when the shift switch is switched between gears, along with the sliding of the contact spring, two resistors with different resistance values are connected in parallel, and are divided by the pull-up resistor of the power supply, and different divided voltage values are collected by the single chip microcomputer to judge the gears, and the working process is as follows: when the gear is in a 0 gear, the toggle switch contact spring is pulled to connect R1 and R2 in parallel, and then the voltage is divided by R7, and at the moment, the voltage value collected by the singlechip P40 is 0.6 VCC; similarly, when the shifting switch is shifted to the 1-gear position, the contact spring piece of the shifting switch connects R2 and R3 in parallel and then divides voltage with R7, the voltage value collected by the singlechip P40 is 0.545 VCC, and with the shifting switch being shifted to the right, the voltage value collected by the singlechip P40 is 0.5VCC after R3 and R4 are connected in parallel and then divides voltage with R7; the 3-gear R4 and R5 are connected in parallel and then are subjected to voltage division with R7, and the voltage value acquired by the single chip microcomputer P40 is 0.4 VCC; the 4-gear R5 and R6 are connected in parallel and then are subjected to voltage division with R7, and the voltage value acquired by the single chip microcomputer P40 is 0.333 VCC; the single chip microcomputer software detects different voltage values of the P40 pin positions, identifies the current gear, and then the MCU outputs PWM (pulse width modulation) driving MOS (metal oxide semiconductor) tubes with corresponding duty ratios to carry out motor speed regulation; the gear identification method has the advantages that gear identification can be performed by using fewer connecting wires and I/O, but has the following disadvantages:
1. the scheme cannot realize circuit system awakening, is not suitable for low standby power consumption product application, is particularly suitable for product application with strict energy-saving requirements of handheld products powered by batteries, and has very limited application range;
2. which, although reducing the use of connecting wires, still requires three core-flex connections.
Therefore, the existing toggle switch circuit can only recognize gears by at least three connecting wires, and cannot recognize multiple gears through a single connecting wire and give consideration to circuit system awakening.
Disclosure of Invention
In order to solve the problems mentioned in the background art, the invention provides a multi-gear toggle switch and a circuit thereof, a multi-gear identification circuit and a device, wherein the multi-gear toggle switch circuit comprises a plurality of pins which are arranged in two rows; the sampling circuit also comprises a plurality of sampling resistors connected in series; wherein:
one pin of the zero gear is grounded;
one pin of the first gear is grounded through a sampling resistor, and the other pin of the first gear is connected with a pin of a third gear on the same side and a connecting node of a pin of a second gear on the opposite side of the first gear is connected with the single chip microcomputer;
the other pin of the third gear is grounded through two sampling resistors; and a pin of a fourth gear on the opposite side of the pin connected with the sampling resistor of the third gear is grounded through three sampling resistors.
Further, the model of the sampling resistor is 2.2K 1%.
The invention also provides a multi-gear toggle switch which adopts the multi-gear toggle switch circuit.
The invention also provides a multi-gear identification circuit, which adopts the multi-gear toggle switch circuit as described above; the gear identification single-chip microcomputer U1 and a resistor R5 are further included;
the first gear pin, the second gear pin and the third gear pin are all connected with an awakening I/O port of the single chip microcomputer U1 through resistors R5;
and the connecting node of each pin and the resistor R5 is connected with the gear judgment I/O port of the single chip microcomputer U1.
Further, the model of the single chip microcomputer U1 is SN8P 2711B.
Further, the resistor R5 has a resistance of 2.2K Ω.
The invention additionally provides a device which adopts the multi-gear identification circuit as described in any one of the above.
According to the multi-gear toggle switch circuit, the structure of the switch circuit is designed by flexibly utilizing the structural characteristics of the toggle switch and the sliding track of the contact elastic sheet, and three sampling resistors are matched to judge the gear and wake up the system; and awakening the circuit system when the gear is switched from the zero gear to the first gear, carrying out A/D sampling through an I/O port of the singlechip after the circuit system is awakened so as to identify the current gear, and keeping the current gear in the shifting process of the shifting switch. According to the multi-gear toggle switch circuit, on one hand, gear distinguishing can be achieved only by two flat cables between the toggle switch and the single chip microcomputer, the use of connecting wires and components is reduced, the hardware cost is low, the current gear can be kept unchanged in the gear shifting and shifting process, and the problem of gear falling in the gear shifting process is avoided; on the other hand, the circuit awakening function is realized, and the problem that the circuit system is awakened because a single connecting line cannot identify multiple gears in the conventional switch circuit is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of a conventional shift level differentiation;
FIG. 2 is another circuit diagram of a conventional shift stage circuit;
FIG. 3 is a circuit diagram of a multi-gear toggle switch circuit provided by the present invention;
FIG. 4 is a schematic diagram of the circuit conduction when the multi-gear toggle switch circuit is in the zeroth gear;
FIG. 5 is a schematic diagram of the circuit conduction of the multi-gear toggle switch circuit in the first gear;
FIG. 6 is a schematic diagram of the circuit conduction of the multi-gear toggle switch circuit in the second gear position;
FIG. 7 is a schematic diagram of the circuit conduction of the multi-gear toggle switch circuit in the third gear;
FIG. 8 is a schematic diagram of the circuit conduction when the multi-gear toggle switch circuit is in the fourth gear;
FIG. 9 is a view showing the internal structure of the toggle switch;
fig. 10 is a diagram illustrating the sliding process of the toggle switch from the 0-position to the 1-position.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a multi-gear toggle switch and a circuit thereof, a multi-gear identification circuit and a device, wherein the multi-gear toggle switch circuit comprises a plurality of pins and contact sliding elastic sheets which are arranged in two rows, and the contact sliding elastic sheets are used for conducting two opposite pins; the sampling circuit also comprises a plurality of sampling resistors connected in series; wherein:
one pin of the zero gear is grounded;
one pin of the first gear is grounded through a sampling resistor, and the other pin of the first gear is connected with a pin of a third gear on the same side and a connecting node of a pin of a second gear on the opposite side of the first gear is connected with the single chip microcomputer;
the other pin of the third gear is grounded through two sampling resistors; and a pin of a fourth gear on the opposite side of the pin connected with the sampling resistor of the third gear is grounded through three sampling resistors.
In specific implementation, as shown in fig. 3, the multi-gear toggle switch circuit includes 12 pins and contact sliding spring pieces arranged in two rows, the switch uses a duplex 5-gear toggle switch, and the upper and lower sides are independent; wherein, the 1 st, 2 nd, 3 rd, 4 th, 5 th and 6 th pins are in one row, and the 12 th, 11 th, 10 th, 9 th, 8 th and 7 th pins are in another row which are arranged oppositely in sequence; the contact sliding elastic sheet is used for conducting the two opposite pins; the sampling resistor R1, the sampling resistor R3 and the sampling resistor R4 are further included, and the sampling resistor R1, the sampling resistor R3 and the sampling resistor R4 are connected in series; wherein: the model of the sampling resistor R1, the model of the sampling resistor R3 and the model of the sampling resistor R4 are both 2.2K 1%;
the switch circuit comprises a zero gear, a first gear, a second gear and a third gear, and the gears are sequentially opened by sliding the contact sliding elastic sheet from left to right;
the 2 nd pin of the zero gear is grounded;
the 10 th pin of the first gear is grounded through a sampling resistor R1, and the 3 rd pin is connected with the 5 th pin of the third gear on the same side and the 9 th pin of the second gear on the opposite side as AD-SW signal ends and is connected with a wake-up I/O port (P02 port) of a singlechip U1 through a resistor R5;
the 8 th pin of the third gear is grounded through a sampling resistor R3 and a sampling resistor R1 in sequence; the 6 th pin of the fourth gear, which is on the opposite side of the 8 th pin of the third gear, is grounded through a sampling resistor R4, a sampling resistor R3 and a sampling resistor R1 in sequence;
the model of the single chip microcomputer U1 is SN8P 2711B; the resistance value of the resistor R5 is 2.2K omega;
and the connecting node of each pin and the resistor R5 is connected with a gear judgment I/O port (P40 port) of the single chip microcomputer U1.
As shown in fig. 4, when the contact sliding spring is shifted to the zeroth gear, the AD-SW terminal of the switch is equivalently suspended, a pull-up resistor is arranged in the P02 port of the single chip microcomputer U1, because the AD-SW is suspended, and the P02 port of the single chip microcomputer U1 is at a high level at the zeroth gear position.
As shown in fig. 5, when the contact sliding elastic piece is shifted to the right to the first gear, as long as the contact sliding elastic piece is not yet in contact with the pin of the first gear, the AD-SW remains suspended, and the system recognizes that the contact sliding elastic piece stays at the zeroth gear; when the contact sliding elastic sheet is shifted to a first gear, the AD-SW is directly grounded, the P02 port of the single chip microcomputer U1 is changed from high level to low level 0, and meanwhile, a circuit system is awakened due to 1- > 0 (the high level is changed from 1 to low level 0).
As shown in fig. 6, when the contact sliding elastic piece is shifted to the right to the second gear, as long as the contact sliding elastic piece is not yet in contact with the pin of the second gear, the AD-SW is always kept at the low level 0, and the system identifies that the contact sliding elastic piece is still at the first gear; when the contact sliding elastic sheet is shifted to a second gear, a P02 port of the singlechip U1 outputs a high level (VCC), and the V is divided into voltage after being connected in series through a resistor R5 and a resistor R1AD-SW0.5 × VCC; and the P40 port of the single-chip microcomputer U1 is 0.5VCC by sampling AD-SW voltage, and the single-chip microcomputer U1 identifies the second gear.
As shown in fig. 7, in the process of shifting the contact sliding elastic sheet to the right to the third gear, as long as the contact sliding elastic sheet is not yet in contact with the pin of the third gear, the switch elastic sheet keeps the connection state when the second gear is shifted, and the single chip microcomputer U1 recognizes that the second gear is still shifted; when the contact sliding elastic piece is shifted to a third gear, a P02 port of the single chip microcomputer U1 outputs high Voltage (VCC), and the high Voltage (VCC) is obtained by voltage division on a resistor R1+ a resistor R3 in series after the high voltage is connected with the resistor R5, the resistor R1 and the resistor R3 in series: vAD-SW＝0.667 VCC; and the P40 port of the single-chip microcomputer U1 is 0.667 VCC in voltage through sampling AD-SW, and the single-chip microcomputer U1 recognizes the third gear.
As shown in fig. 8, in the process of shifting the contact sliding elastic sheet to the right to the fourth gear, as long as the contact sliding elastic sheet is not yet in contact with the pin of the fourth gear, the switch elastic sheet will maintain the connection state when the third gear is reached, and the single chip microcomputer U1 recognizes that the third gear is still reached; when the contact sliding elastic piece is shifted to a fourth gear, a P02 port of the single chip microcomputer U1 outputs high Voltage (VCC), and the high Voltage (VCC) is divided into a resistor R1+ a resistor R3+ a resistor R4 in series after the high Voltage (VCC) is connected in series through a resistor R5, a resistor R1, a resistor R3 and a resistor R4: vAD-SW0.75 × VCC; and the P40 port of the single-chip microcomputer U1 is 0.75 VCC by sampling the AD-SW voltage, and the single-chip microcomputer U1 identifies the fourth gear.
The sampling voltages of all the gears are respectively as follows:
the zeroth gear: vAD-SW＝VCC；
A first gear: vAD-SW＝O；
A second gear: vAD-SW＝0.5*VCC；
A third gear: vAD-SW＝0.667*VCC；
A fourth gear: vAD-SW＝0.75*VCC。
As shown in fig. 1, in a conventional switching circuit:
in the first case: the gear 0 is the low level of P40, the gear 1 is the low level of P02, when sliding from the gear 0 to the gear 1, the contacts 1, 2 and 3 are short-circuited together (as shown in FIG. 10) due to the toggle switch structure, and meanwhile, the P40 and the P02 are both low levels, and at this time, the gear 0 or the gear 1 cannot be judged;
in the second case: the 1 gear P02 is low, the 2 gear P04 is low, when sliding from the 1 gear to the 2 gear, the 2,3 and 4 contacts are short-circuited together, and the P02 low level and the P04 low level are both low; p41 and P44 are in a short circuit state and cannot keep the original gear;
and so on, from 2 nd gear to 3 rd gear process: p04 and P41 are both low; during the process of sliding from 3 gear to 4 gear: both P40 and P41 are low.
Therefore, the existing switching circuit scheme cannot keep the original gear.
As shown in fig. 2, another conventional switching circuit includes:
first case 0VAD-SW1Comprises the following steps: 0.6 VCC; the 1 st gear AD-SW1 is: 0.545 VCC; during the process of sliding from the 0 gear to the 1 gear: vAD-SW10.46 VCC (equivalent to R1/R2/R3 in the circuit, which are connected in parallel and then divided by R7);
second case 1 gear VAD-SW10.545 VCC; 2V gearAD-SW10.5 VCC; during the process of sliding from the 1 gear to the 2 gear: vAD-SW1Is 0.428VCC (equivalent to the R2/R3/R4 in the circuit which are connected in parallel and then divided by the R7);
and so on, V when sliding from 2 to 3AD-SW10.333 VCC (identified as 4 th gear in this case); during the process of sliding from 3 gear to 4 gear: vAD-SW1Is 0.285 VCC.
Therefore, the conventional switch circuit cannot maintain the original gear.
In conclusion, the existing toggle switch can not keep the original gear state in the sliding process.
As shown in fig. 3, the switching circuit of the present invention:
in the first case: shifting from the zero gear to the first gear, wherein the gears do not need to be identified, only the singlechip needs to be awakened to enter the first gear state, and the circuit system is awakened as long as the switch slides;
in the second case: when shifting from first gear to second gear, V is due to the position of first gearAD-SWLow level 0 state, second gear position VAD-SW0.5 VCC; during the first gear is slid to the second gear: because of the short circuit of the 2 nd, 3 rd and 4 th pins in the upper row, VAD-SWOr 0 state, maintaining the first gear state;
in the third case: from second gear to third gear, due to second gear position VAD-SWIs 0.5 VCC; third gear position VAD-SWIs 0.667 VCC; during the second gear step slipping to the third gear step: r3 is equivalent to being short-circuited, so this goes into VAD-SWOr 0.5 VCC;
in a fourth case:pulling from third gear to fourth gear due to third gear position VAD-SWIs 0.667 VCC; fourth gear position VAD-SW0.75 × VCC; during the third gear step to the fourth gear step VAD-SWOr 0.667 VCC. Therefore, the switching circuit provided by the invention maintains the original gear as long as the gear is not pulled in place in the process of pulling the switch after the system is awakened through the ingenious circuit structure design, thereby achieving the purpose of gear maintenance.
According to the multi-gear toggle switch circuit provided by the embodiment of the invention, the structure of the switch circuit is designed by flexibly utilizing the structural characteristics of the toggle switch and the sliding track of the contact elastic sheet, and three sampling resistors are matched for gear judgment and system awakening; and awakening the circuit system when the gear is switched from the zero gear to the first gear, carrying out A/D sampling through an I/O port of the singlechip after the circuit system is awakened so as to identify the current gear, and keeping the current gear in the shifting process of the shifting switch. According to the multi-gear toggle switch circuit provided by the embodiment of the invention, on one hand, gear distinguishing can be realized only by two flat cables between the toggle switch and the single chip microcomputer, the use of connecting wires and components is reduced, the hardware cost is low, and in the gear shifting and shifting process, the current gear can be kept unchanged, so that the problem of gear falling in the gear shifting process is avoided; on the other hand, the circuit awakening function is realized, and the problem that the circuit system is awakened because a single connecting line cannot identify multiple gears in the conventional switch circuit is solved.
The invention also provides a multi-gear toggle switch which adopts the multi-gear toggle switch circuit.
The invention additionally provides a device, including but not limited to a hand-held blender and a juicer, which adopts the multi-gear identification circuit as described in any one of the above.
The types and parameters of the electronic components in the circuit can be determined according to actual conditions.
Although terms such as zero gear, first gear, second gear, third gear, fourth gear, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A multi-gear toggle switch circuit is characterized by comprising a five-gear duplex switch, wherein the five-gear duplex switch comprises a plurality of pins which are arranged in two rows, the 1 st, 2 nd, 3 rd, 4 th, 5 th and 6 th pins are arranged in one row, and the 12 th, 11 th, 10 th, 9 th, 8 th and 7 th pins are arranged in the other row in opposite order; the sampling circuit also comprises a plurality of sampling resistors connected in series; wherein:
the 2 nd pin of the zero gear is grounded;
the 10 th pin of the first gear is grounded through a sampling resistor R1, and the 3 rd pin is connected with the 5 th pin of the third gear on the same side and the 9 th pin of the second gear on the opposite side;
the 8 th pin of the third gear is grounded through two sampling resistors R3 and R1 which are connected in series; the 6 th pin of the fourth gear, which is not connected with the 8 th pin of the third gear, is grounded through three sampling resistors R4, R3 and R1 which are connected in series; the model of the sampling resistor is 2.2K +/-1%.
2. A multi-gear toggle switch is characterized in that: a multi-position toggle switch circuit according to claim 1 is employed.
3. A multi-gear identification circuit, characterized by: a multi-gear toggle switch circuit according to any one of claims 1-2; the gear identification single-chip microcomputer U1 and a resistor R5 are further included;
the first gear pin, the second gear pin and the third gear pin are all connected with an awakening I/O port of the single chip microcomputer U1 through resistors R5;
and the connecting node of each pin and the resistor R5 is connected with the gear judgment I/O port of the single chip microcomputer U1.
4. The multi-range identification circuit according to claim 3, wherein: the model of the single chip microcomputer U1 is SN8P 2711B.
5. The multi-range identification circuit according to claim 3, wherein: the resistor R5 has a resistance of 2.2K omega.
6. A multi-gear identification device is characterized in that: a multi-range identification circuit according to any of claims 3-5 is used.
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CN107332458A (en) * 2017-08-25 2017-11-07 广东工业大学 A kind of pulse width modulator and the pulse power
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