CN109240175B

CN109240175B - Singlechip drive circuit

Info

Publication number: CN109240175B
Application number: CN201811295341.0A
Authority: CN
Inventors: 罗军; 山江林; 陈新
Original assignee: Foshan Shunde Xinxun Electronic Technology Co ltd
Current assignee: Foshan Shunde Xinxun Electronic Technology Co ltd
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2023-10-13
Anticipated expiration: 2038-11-01
Also published as: CN109240175A

Abstract

The invention provides a singlechip driving circuit which comprises a singlechip microprocessor, a load driving circuit, a key input scanning module, an interface display module, an AD detection module, an alarm driving module and a switch arranged in a load power utilization loop, wherein the load driving circuit is connected with the load power utilization loop; the alarm driving module and the AD detection module are connected with an AD1 pin of the singlechip. In the invention, the AD detection module and the alarm driving module use the same single-chip microcomputer IO interface, so that the single-chip microcomputer IO interface is saved, and the cost is also saved.

Description

Singlechip drive circuit

Technical Field

The invention relates to the field of single-chip microcomputer control circuits, in particular to a method for realizing AD detection and connection of a buzzer BUZ1 by utilizing an AD pin of a single-chip microcomputer.

Background

At present, a plurality of singlechip control circuits in the market generally use an I/O port of a singlechip to output a control signal, and then a driving circuit is utilized to drive a switch such as a relay, a mos tube and the like to be closed or opened under the control of the control signal, so that a driven load such as a motor, a heater and the like is connected with or disconnected from a power supply, and the load is powered on or not.

The traditional single chip microcomputer driving circuit is an intelligent driving circuit, is provided with an I/O interface for outputting control parameter input, is used for receiving the setting of output parameters, such as a keyboard formed by a group of keys, and is also used for displaying states, such as a group of LED display nixie tubes, parameters and the like, for example, the driving of loads is intelligent, so that the condition of the loads needs to be detected, such as the temperature of substances heated by the loads can be detected when the loads are heaters, whether the heaters need to be driven to work is determined according to the detected temperature, and a temperature sensor is used for outputting an analog voltage signal representing the temperature, so that the analog voltage signal needs to be input into an AD input end of the single chip microcomputer for digitizing and then participates in logic operation in the single chip microcomputer. In addition, for these automatic control devices, if the working state is problematic, prompt is required, so there are some prompt information display devices such as an audible and visual alarm, and many conventional AD detection and buzzer BUZ1 driving circuits on the market are stand alone, such circuits require two single-chip microcomputer I/O ports, and if the AD detection and buzzer BUZ1 is connected to the single-chip microcomputer through a flat cable, two wires are required to increase the design cost. Therefore, the traditional circuit occupies the pin resources of the singlechip, and the probability and the cost of broken line faults are high when wires are connected.

Disclosure of Invention

Aiming at the defects that the AD detection and buzzer BUZ1 driving circuit in the traditional single-chip microcomputer driving circuit is single, two single-chip microcomputer I/O ports are needed, the probability of wire breakage fault during wire connection and the cost are high, the invention provides the single-chip microcomputer driving circuit, and the single-chip microcomputer driving circuit uses one I/O port to realize detection signal input and warning signal output.

The technical scheme adopted by the invention for realizing the technical purpose is that the singlechip driving circuit comprises a singlechip microprocessor, a load driving circuit, a key input scanning module, an interface display module, an AD detection module, an alarm driving module and a switch arranged in a load power utilization loop; the load driving circuit, the key input scanning module, the interface display module, the AD detection module and the alarm driving module are respectively connected with the singlechip microprocessor; the singlechip microprocessor generates information according to the AD detection module and information input from the key input scanning module, controls the load driving circuit to drive the switch to be opened or closed, controls the alarm driving module to alarm or not, and displays the alarm on the interface display module; the alarm driving module is a buzzer BUZ1 driving module and comprises a buzzer BUZ1, a triode Q201, a diode D201, a resistor R203, a resistor R202, a resistor R201 and a capacitor C201; the AD1 pin of the singlechip microprocessor (5) is connected with one end of a resistor R201 and the N pole of a diode D201 through a capacitor C201, the other end of the resistor R201 is connected with the base electrode of a triode Q201, and the emitter electrode of the triode Q201 is connected with the P pole of the diode D201 and grounded; the working voltage is connected with the positive electrode of the buzzer BUZ1 through a resistor R203, the negative electrode of the buzzer BUZ1 is connected with the collector electrode of a triode Q201, and a resistor R202 is connected between the positive electrode and the negative electrode of the buzzer BUZ 1; the AD detection module is connected with an AD1 pin of the single-chip microcomputer microprocessor through a sampling circuit, the sampling circuit comprises a plug J1 connected with the AD detection module (6), a capacitor C101, a resistor R3 and a resistor R108, the output end of a detection signal in the plug J1 is respectively connected with one end of the capacitor C101, one end of the resistor R3 and one end of the resistor R108, the other end of the capacitor C101 is connected with the other end of the resistor R108 and is grounded, and the other end of the resistor R3 is connected with the AD1 pin of the single-chip microcomputer microprocessor.

In the invention, the AD detection module and the alarm driving module use the same single-chip microcomputer IO interface, so that the single-chip microcomputer IO interface is saved, and the cost is also saved.

Further, in the above-mentioned singlechip driving circuit: the load is heater Heat, the AD detection module is a temperature sensor with an analog signal output, a power switch of the heater Heat is a relay RL3, a power input end of the heater Heat is connected with a CAN end of mains supply through the relay RL3, and the other power input end is connected with an ACL end of the mains supply.

Further, in the above-mentioned singlechip driving circuit: the driving circuit of the relay RL3 comprises a triode Q102, a diode D106, a resistor R122 and a resistor R102; the heater control output I/OHEAT of the singlechip microprocessor is connected with one end of a resistor R122, the other end of the resistor R122 is connected with the base electrode of a triode Q102, the emitter electrode of the triode Q102 is grounded, and the collector electrode is connected with a working power supply through a relay winding; the resistor R102 is arranged between the base electrode and the emitter electrode of the triode Q102, the diode D106 is arranged between the collector electrode of the triode Q102 and the working power supply, and the P electrode of the diode D106 is connected with the collector electrode of the triode Q102.

Further, in the above-mentioned singlechip driving circuit: the power supply circuit for supplying power to the singlechip driving circuit is a power supply module for converting commercial power into working voltage VDD; the power supply module comprises a non-isolated high-efficiency AC/DC conversion chip IC101, a piezoresistor ZR101, a capacitor C103, a resistor R121, a resistor R110, a diode D102, a diode D103, an electrolytic capacitor EC101, an electrolytic capacitor EC102, an inductor L101, a diode D104, an electrolytic capacitor EC103, a capacitor C104, an inductor L102, a diode D106, an electrolytic capacitor EC105, a capacitor C105, a resistor R115, a resistor R111, a resistor R114, a resistor R112, a triode Q101, a triode Q103, a voltage stabilizing tube ZD101, an electrolytic capacitor EC106, a capacitor C106, a resistor R113 and an electrolytic capacitor EC107;

the resistor R110, the diode D102, the diode D103, the inductor L101, the non-isolated high-efficiency AC/DC conversion chip IC101 and the diode D106 are sequentially connected to an ACN end of the mains supply; a piezoresistor ZR101, a capacitor C103 and a resistor R121 are connected between a public end of the resistor R110 connected with the P pole of the diode D102 and a mains supply ACL; the P pole of the diode D103 is connected with the N pole of the diode D102, the N pole of the diode D103 is connected with one end of the inductor L101, the two sides of the inductor L101 are respectively connected with the mains supply ACL through the electrolytic capacitor EC101 and the electrolytic capacitor EC102, and the electrolytic capacitor EC101 and the electrolytic capacitor EC102 are respectively connected with the mains supply ACL through the cathodes; the other end of the inductor L101 is connected with pins 5, 6, 7 and 8 of a non-isolated high-efficiency AC/DC conversion chip IC101 with the model PN8024, a pin 4 of the non-isolated high-efficiency AC/DC conversion chip IC101 with the model PN8024 is connected with a mains supply ACL through a diode D104 and a pin 1 through an electrolytic capacitor EC103 respectively, the N pole of the diode D104 and the anode of the electrolytic capacitor EC103 are connected with the pin 4 of the non-isolated high-efficiency AC/DC conversion chip IC101, the pin 3 of the non-isolated high-efficiency AC/DC conversion chip IC101 is connected with the pin 1 through a capacitor C104, and the pin 2 is connected with the pin 1; pin 1 of the non-isolated high-efficiency AC/DC conversion chip IC101 is connected with the N pole of the diode D106 and one end of the inductor L102 respectively; the other end of the inductor L102 is connected with a mains supply ACN, and the P electrode of the diode D106 is respectively connected with the cathode of the electrolytic capacitor EC105, one end of the capacitor C105, the anode of the voltage stabilizing tube ZD101, the cathode of the electrolytic capacitor EC106, one end of the capacitor C106 and one end of the resistor R113 to form a working place; the anode of the electrolytic capacitor EC105 and the other end of the capacitor C105 are connected with a mains supply CAN, the cathode of the voltage stabilizing tube ZD101 is connected with the bases of the triode Q101 and the triode Q103, the anode of the electrolytic capacitor E, the other end of the capacitor C106 and the other end of the resistor 113 are connected with the emitter of the triode Q101, the collectors of the triode Q101 and the triode Q103 are connected with the mains supply CAN through R115, a resistor R111 and a resistor R114 respectively, and the resistor R112 is connected between the mains supply CAN and the bases of the triode Q101 and the triode Q103; the emitter of the triode is grounded through a capacitor C107 and an electrolytic capacitor EC107 respectively, the emitter of the triode Q101 forms a +5V power supply, and the emitter of the triode Q103 forms VDD.

The invention will be described in more detail below with reference to the drawings and examples.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a wiring diagram of a microprocessor of a single-chip microcomputer according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a buzzer BUZ1 and an AD detection module according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a load driving module according to an embodiment of the present invention.

FIG. 5 is a block diagram of a key module according to an embodiment of the present invention.

FIG. 6 is a block diagram of an embodiment of the present invention.

FIG. 7 is a power block diagram of an embodiment of the present invention.

Detailed Description

Embodiment 1, as shown in the figure, is a single-chip microcomputer driving circuit for intelligently controlling a heater by using a single-chip microcomputer, and of course, may also be an intelligent control circuit for other loads, such as a motor. As shown in fig. 1, the whole circuit comprises a single-chip microcomputer microprocessor 5, a load driving circuit 4, a key input scanning module 2, an interface display module 3, an AD detection module 6, an alarm driving module 7, a switch arranged in a load power utilization loop and a power supply module 1 for supplying power to the modules; the load driving circuit 4, the key input scanning module 2, the interface display module 3, the AD detection module 6 and the alarm driving module 7 are respectively connected with the singlechip microprocessor 5; the singlechip microprocessor 5 generates a control load driving circuit 4 to drive a switch to be opened or closed according to the information of the AD detection module 6 and the information input from the key input scanning module 2, controls an alarm driving module 7 to alarm or not, and displays the alarm on the interface display module 3; the alarm driving module 7 of the (1) is a buzzer BUZ1 driving module shown in figure 3 and comprises a buzzer BUZ1, a triode Q201, a diode D201, a resistor R203, a resistor R202, a resistor R201 and a capacitor C201; the AD1 pin of the singlechip microprocessor 5 is connected with one end of a resistor R201 and the N pole of a diode D201 through a capacitor C201, the other end of the resistor R201 is connected with the base electrode of a triode Q201, and the emitter electrode of the triode Q201 is connected with the P pole of the diode D201 and grounded; the working voltage is connected with the positive electrode of the buzzer BUZ1 through a resistor R203, the negative electrode of the buzzer BUZ1 is connected with the collector electrode of a triode Q201, and a resistor R202 is connected between the positive electrode and the negative electrode of the buzzer BUZ 1; the AD detection module 6 is connected with an AD1 pin of the single-chip microcomputer microprocessor 5 through a sampling circuit, the sampling circuit comprises a plug J1 connected with the AD detection module 6, a capacitor C101, a resistor R3 and a resistor R108, the output end of a detection signal in the plug J1 is respectively connected with one end of the capacitor C101, one end of the resistor R3 and one end of the resistor R108, the other end of the capacitor C101 is connected with the other end of the resistor R108 and is grounded, and the other end of the resistor R3 is connected with the AD1 pin of the single-chip microcomputer microprocessor 5. Fig. 2 shows a pin diagram of the single-chip microprocessor 5.

In this embodiment, the buzzer BUZ1 is required to sound, the singlechip microprocessor 5 outputs a frequency on control Q201 to turn on and off, so as to control the buzzer BUZ1 to sound, and the AD detection is that the singlechip microprocessor 5 reads the sampled voltage to perform internal conversion to obtain the resistance value of the resistor with the heat name, and the two circuits are isolated through the capacitor C201.

When AD detection is needed, the single-chip microcomputer microprocessor 5 is set to be in an input detection state, the voltage at the AD1 is basically in a stable state, the capacitor C201 is in a fully charged state and is equivalent to disconnection, the buzzer BUZ1 does not sound, and the single-chip microcomputer microprocessor 5 carries out AD conversion processing through a voltage signal at the AD1 to obtain temperature; when the buzzer BUZ1 is required to sound, the single-chip microcomputer microprocessor 5 sets the port to be in an output state through the inside, at the moment, 4K of frequency is output, when the high level is output, the capacitor C201 is charged, when the low level is output, the capacitor C201 is discharged, in the process of charging and discharging the capacitor C201, the capacitor C201 is equivalent to a wire, the AD1 is communicated with the resistor R201, and accordingly the triode Q201 is driven to switch, and the buzzer BUZ1 sounds.

In this embodiment, the load is a heater Heat, the AD detection module 6 is a temperature sensor with an analog signal output, the power switch of the heater Heat is a relay RL3, the power input end of the heater Heat is connected to the ACN end of the mains supply through the relay RL3, and the other power input end is connected to the ACL end of the mains supply. The driving circuit of the relay RL3 is shown in fig. 4, and includes a triode Q102, a diode D106, a resistor R122, and a resistor R102; the heater control output I/OHEAT of the singlechip microprocessor 5 is connected with one end of a resistor R122, the other end of the resistor R122 is connected with the base electrode of a triode Q102, the emitter electrode of the triode Q102 is grounded, and the collector electrode is connected with a working power supply through a relay winding; the resistor R102 is arranged between the base electrode and the emitter electrode of the triode Q102, the diode D106 is arranged between the collector electrode of the triode Q102 and the working power supply, and the P electrode of the diode D106 is connected with the collector electrode of the triode Q102.

Fig. 5 is a key module, through which the corresponding IO port of the single-chip microprocessor 5 can be grounded to obtain an input signal, and the display module is shown in fig. 6.

The power supply circuit for supplying power to the singlechip driving circuit is a power supply module for converting commercial power into working voltage VDD as shown in FIG. 7; the power supply module comprises a non-isolated high-efficiency alternating current-direct current conversion chip IC101, a piezoresistor ZR101, a capacitor C103, a resistor R121, a resistor R110, a diode D102, a diode D103, an electrolytic capacitor EC101, an electrolytic capacitor EC102, an inductor L101, a diode D104, an electrolytic capacitor EC103, a capacitor C104, an inductor L102, a diode D106, an electrolytic capacitor EC105, a capacitor C105, a resistor R115, a resistor R111, a resistor R114, a resistor R112, a triode Q101, a triode Q103, a voltage regulator ZD101, an electrolytic capacitor EC106, a capacitor C106, a resistor R113 and an electrolytic capacitor EC107;

Claims

1. The single-chip microcomputer driving circuit comprises a single-chip microcomputer microprocessor (5), a load driving circuit (4), a key input scanning module (2), an interface display module (3), an AD detection module (6), an alarm driving module (7) and a switch arranged in a load power utilization loop; the load driving circuit (4), the key input scanning module (2), the interface display module (3), the AD detection module (6) and the alarm driving module (7) are respectively connected with the singlechip microprocessor (5); the singlechip microprocessor (5) generates and controls the load driving circuit (4) to drive the switch to be opened or closed according to the information of the AD detection module (6) and the information input from the key input scanning module (2), controls the alarm driving module (7) to alarm or not and displays the alarm on the interface display module (3); the method is characterized in that: the alarm driving module (7) is a buzzer BUZ1 driving module and comprises a buzzer BUZ1, a triode Q201, a diode D201, a resistor R203, a resistor R202, a resistor R201 and a capacitor C201; the AD1 pin of the singlechip microprocessor (5) is connected with one end of a resistor R201 and the N pole of a diode D201 through a capacitor C201, the other end of the resistor R201 is connected with the base electrode of a triode Q201, and the emitter electrode of the triode Q201 is connected with the P pole of the diode D201 and grounded; the working voltage is connected with the positive electrode of the buzzer BUZ1 through a resistor R203, the negative electrode of the buzzer BUZ1 is connected with the collector electrode of a triode Q201, and a resistor R202 is connected between the positive electrode and the negative electrode of the buzzer BUZ 1; the AD detection module (6) is connected with an AD1 pin of the single-chip microcomputer microprocessor (5) through a sampling circuit, the sampling circuit comprises a plug J1 connected with the AD detection module (6), a capacitor C101, a resistor R3 and a resistor R108, the output end of a detection signal in the plug J1 is respectively connected with one end of the capacitor C101, one end of the resistor R3 and one end of the resistor R108, the other end of the capacitor C101 is connected with the other end of the resistor R108 and grounded, and the other end of the resistor R3 is connected with the AD1 pin of the single-chip microcomputer microprocessor (5).

2. The single chip microcomputer driving circuit according to claim 1, wherein: the load is heater Heat, AD detection module (6) be the temperature sensor that the output is analog signal, heater Heat's switch is relay RL3, heater Heat power input holds the CAN end of commercial power through relay RL3, another power input holds the ACL end of commercial power.

3. The single chip microcomputer driving circuit according to claim 2, wherein: the driving circuit of the relay RL3 comprises a triode Q102, a diode D106, a resistor R122 and a resistor R102; the heater control output I/OHEAT of the singlechip microprocessor (5) is connected with one end of a resistor R122, the other end of the resistor R122 is connected with the base electrode of a triode Q102, the emitter electrode of the triode Q102 is grounded, and the collector electrode is connected with a working power supply through a relay winding; the resistor R102 is arranged between the base electrode and the emitter electrode of the triode Q102, the diode D106 is arranged between the collector electrode of the triode Q102 and the working power supply, and the P electrode of the diode D106 is connected with the collector electrode of the triode Q102.

4. A single-chip microcomputer driving circuit according to claim 1, 2 or 3, characterized in that: the power supply circuit for supplying power to the singlechip driving circuit is a power supply module for converting commercial power into working voltage VDD; the power supply module comprises a non-isolated high-efficiency AC/DC conversion chip IC101, a piezoresistor ZR101, a capacitor C103, a resistor R121, a resistor R110, a diode D102, a diode D103, an electrolytic capacitor EC101, an electrolytic capacitor EC102, an inductor L101, a diode D104, an electrolytic capacitor EC103, a capacitor C104, an inductor L102, a diode D106, an electrolytic capacitor EC105, a capacitor C105, a resistor R115, a resistor R111, a resistor R114, a resistor R112, a triode Q101, a triode Q103, a voltage stabilizing tube ZD101, an electrolytic capacitor EC106, a capacitor C106, a resistor R113 and an electrolytic capacitor EC107;