CN217036740U - Overload protection circuit board for small household electrical appliance - Google Patents
Overload protection circuit board for small household electrical appliance Download PDFInfo
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- CN217036740U CN217036740U CN202122275948.6U CN202122275948U CN217036740U CN 217036740 U CN217036740 U CN 217036740U CN 202122275948 U CN202122275948 U CN 202122275948U CN 217036740 U CN217036740 U CN 217036740U
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Abstract
The utility model discloses an overload protection circuit board for small household appliances, belonging to the technical field of electronics; the circuit board specifically comprises a control circuit, a voltage detection circuit, a motor drive circuit, a current detection circuit, a buzzer alarm circuit, an LED display drive circuit and a charging circuit; the current detection circuit is used for detecting a current signal of the electric motor, the current signal is sampled by capturing and is compared with a preset threshold value, when the current signal exceeds the preset threshold value, the control circuit controls the alarm circuit to alarm, and the motor drive circuit controls the electric motor to stop rotating; the utility model can effectively prevent the electric motor from being accidentally stuck in work, avoid the damage to an electronic circuit of the electric motor caused by overlarge current generated by overload and avoid safety accidents caused by the damage.
Description
Technical Field
The utility model discloses an overload protection circuit board for small household appliances relates to electron technical field.
Background
The circuit board is also called as a printed circuit board, is an important electronic component, is a support body of an electronic component, is a carrier for electrical connection of the electronic component, is controlled by a special controller when in use, and contains the circuit board inside.
The utility model discloses an overload protection circuit board for small household appliances, which solves the problems that the circuit board of the small household appliance is easy to burn out and damage the appliance due to frequent failure in the use process of the small household appliance.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides an overload protection circuit board for small household appliances, which adopts the technical scheme that: the utility model provides an overload protection circuit board for small household appliances, the circuit board specifically include control circuit, voltage detection circuit, motor drive circuit, current detection circuit, bee calling organ warning circuit, LED display drive circuit and charging circuit:
the control circuit comprises a control chip U1 and a peripheral capacitor C7, a VSS pin of the control chip U1 is grounded, a VDD end of the control chip U1 is connected with a VBAT lithium battery power supply, and the VSS pin and the VDD pin of the control chip U1 are connected in series through a capacitor C7;
the PA5 pin of the control chip U1 is connected to VBAT through a voltage detection circuit, which specifically includes resistors R3, R4 and a capacitor C1:
the resistor R3 and the resistor R4 are connected in series, and VBAT is grounded; the negative electrode of the capacitor C1 and the PA5 pin of the control chip U1 are connected through a line between the resistor R3 and the resistor R4, and the positive electrode of the capacitor C1 is grounded;
the TIM2-PWM3 pin of the control chip U1 is connected with a motor driving circuit and a current detection circuit, and the motor driving circuit comprises a PMOS tube Q5, a resistor R7, a diode D2 and a capacitor C9:
the diode D2 and the capacitor C9 are respectively connected in parallel at two ends of the motor M1, the positive electrode of the motor M1 is connected with the D electrode of the PMOS tube Q5, the G electrode of the MOS tube Q5 is connected with the TIM2-PWM3 pin of the control chip U1, the S electrode and the G electrode of the PMOS tube Q5 are connected through a resistor R7, and the S electrode of the MOS tube Q5 is connected with VBAT;
the TIM1-PWM2 pin of the control chip U1 is connected with a buzzer alarm circuit;
the pins PA 0-PB 4 of the control chip U1 are connected with an LED display driving circuit;
the current detection circuit specifically comprises resistors R1, R2, R5 and a capacitor C6;
resistor R1 and resistor R2 are connected in parallel to the negative terminal of motor M1;
the PA4/AN2 pin of the control chip U1 is connected with the negative electrode of a capacitor C6, and the positive electrode of the capacitor C6 is grounded; the negative electrode of the capacitor C6 is connected to the negative electrode of the motor M1 through a resistor R5.
The buzzer alarm circuit comprises a buzzer U3, a triode Q6 and a resistor R14;
the base electrode of the triode Q6 is connected with a TIM1-PWM2 pin of a control chip U1 through a resistor R14, the power generation electrode of the triode Q6 is grounded, and the collector electrode of the triode Q6 is connected with VBAT through a buzzer U3.
The LED display driving circuit specifically comprises triodes Q1-Q4, resistors R9, R10, R11, R19 and 28 independent LEDs.
The charging circuit comprises a chip U2, a resistor R8 and a capacitor C2.
And a PB5 pin of the control chip U1 is connected with the key circuit.
The beneficial effects of the utility model are as follows:
this neotype current detection circuit is used for detecting electric motor's current signal, this current signal is through catching the sampling and comparing with predetermined threshold, when this current signal surpassed predetermined threshold, then control circuit control alarm circuit reports to the police, and passes through motor drive circuit control electric motor stops rotatoryly.
The utility model can effectively prevent the electric motor from being accidentally stuck in work, avoid the damage to an electronic circuit of the electric motor caused by overlarge current generated by overload and avoid safety accidents caused by the damage.
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 embodiments or the description of 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 obtain other drawings based on the drawings without inventive labor.
FIG. 1 is a schematic diagram of the circuit structure of the novel circuit board;
fig. 2(1) is a schematic diagram of an LED circuit structure of an LED display driving circuit of the novel circuit board;
fig. 2(2) is a schematic diagram of a triode circuit structure of the LED display driving circuit of the novel circuit board;
fig. 3 is a schematic diagram of a charging circuit structure of the novel circuit board.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
An overload protection circuit board for small household appliances adopts the technical scheme that: the utility model provides an overload protection circuit board for small household appliances, the circuit board specifically include control circuit, voltage detection circuit, motor drive circuit, current detection circuit, buzzer warning circuit, LED display drive circuit and charging circuit:
the control circuit comprises a control chip U1 and a peripheral capacitor C7, and signals of the peripheral circuit are collected through a single chip microcomputer U1 to make corresponding feedback and processing. U1 is MCU control chip, model number FT61F145-TRB (TSSOP 20). The VSS pin of the control chip U1 is grounded, the VDD terminal of the control chip U1 is connected with a VBAT lithium battery power supply, and the VSS pin and the VDD pin of the control chip U1 are connected in series through a capacitor C7.
The PA5 pin of the control chip U1 is connected with VBAT through a voltage detection circuit, and the voltage detection circuit specifically comprises resistors R3, R4 and a capacitor C1.
The resistor R3 and the resistor R4 are connected in series to connect VBAT to ground. The negative electrode of the capacitor C1 and the PA5 pin of the control chip U1 are connected through a line between the resistor R3 and the resistor R4, and the positive electrode of the capacitor C1 is grounded.
This voltage detection circuit is used for detecting the voltage signal of battery, including low-voltage detection: when the electric quantity of the battery is lower than a set threshold value, the voltage signal is compared with the preset threshold value through capturing and sampling, and when the voltage signal is lower than the preset threshold value, the control circuit controls the alarm circuit to give an alarm and controls the electric motor to stop rotating through the motor driving circuit. The method comprises the following steps of normal detection: and (4) starting up for detection, converting the voltage signal into digital information (available time) by capturing and sampling and converting the digital information with a preset algorithm, and displaying the digital information (available time) through the LED display circuit.
The TIM2-PWM3 pin of the control chip U1 is connected with a motor driving circuit and a current detection circuit, and the motor driving circuit comprises a PMOS tube Q5, a resistor R7, a diode D2 and a capacitor C9.
The diode D2 and the capacitor C9 are respectively connected in parallel at two ends of the motor M1, the positive electrode of the motor M1 is connected with the D electrode of the PMOS tube Q5, the G electrode of the MOS tube Q5 is connected with the TIM2-PWM3 pin of the control chip U1, the S electrode and the G electrode of the PMOS tube Q5 are connected through a resistor R7, and the S electrode of the MOS tube Q5 is connected with VBAT.
At the moment when the motor stops supplying power, a reverse self-induction electromotive force is generated at two ends of the motor due to the self-induction phenomenon of the inductor, and the voltage can reach a very high level under the condition of open circuit, and even the insulation level of the coil can be broken down. The diode D2 being conductive at this time may provide a voltage bleed path. C9 may enhance the anti-jamming performance of the motor during operation. When the MCU control circuit identifies a starting signal, the singlechip U1 controls the MOS tube Q5 to be opened, the battery voltage passes through the motor at the moment, and the motor can be started normally.
And a TIM1-PWM2 pin of the control chip U1 is connected with a buzzer alarm circuit.
And pins PA 0-PB 4 of the control chip U1 are connected with an LED display driving circuit.
Further, the current detection circuit specifically comprises resistors R1, R2, R5 and a capacitor C6.
Resistor R1 and resistor R2 are connected in parallel to the negative terminal of motor M1.
The PA4/AN2 pin of the control chip U1 is connected with the negative electrode of the capacitor C6, and the positive electrode of the capacitor C6 is grounded. The negative electrode of the capacitor C6 is connected with the negative electrode of the motor M1 through a resistor R5.
The current detection circuit is used for detecting a current signal of the electric motor, the current signal is captured and sampled and compared with a preset threshold value, when the current signal exceeds the preset threshold value, the control circuit controls the alarm circuit to give an alarm, and the motor drive circuit controls the electric motor to stop rotating. The utility model can effectively prevent the electric motor from being accidentally stuck in work, avoid the damage to an electronic circuit of the electric motor caused by overlarge current generated by overload and avoid safety accidents caused by the damage.
Further, the buzzer alarm circuit comprises a buzzer U3, a triode Q6 and a resistor R14.
The base electrode of the triode Q6 is connected with a TIM1-PWM2 pin of a control chip U1 through a resistor R14, the power generation electrode of the triode Q6 is grounded, and the collector electrode of the triode Q6 is connected with VBAT through a buzzer U3.
The buzzer alarm circuit carries out alarm processing aiming at abnormal conditions. The method comprises the following steps of low-power alarm: when the electric quantity of the battery is lower than a set threshold value, the voltage detection circuit is used for detecting a voltage signal of the battery, the voltage signal is sampled by capturing and is compared with the preset threshold value, when the voltage signal is lower than the preset threshold value, the control circuit controls the alarm circuit to give an alarm, and the motor driving circuit controls the electric motor to stop rotating. The method comprises the following steps of locked-rotor alarming: the current detection circuit is used for detecting a current signal of the electric motor, the current signal is captured and sampled and compared with a preset threshold value, when the current signal exceeds the preset threshold value, the control circuit controls the alarm circuit to give an alarm, and the motor drive circuit controls the electric motor to stop rotating. Specifically, the alarm module comprises a buzzer and/or a white highlight indicator lamp. From this setting, adopt succinct, novel panel design overall arrangement, there is white light as the suggestion when voltage is crossed lowly or load current is too big, the suggestion of buzzer sound in addition simultaneously.
Further, the LED display driving circuit specifically comprises triodes Q1-Q4, resistors R9, R10, R11, R19 and 28 independent LEDs.
The LEDs form a matrix display circuit, the triodes are used as common anodes/common cathodes of the LED lamps, and the LED lamps are turned on and off according to the processing of the MCU control circuit.
Furthermore, the charging circuit comprises a chip U2, a resistor R8 and a capacitor C2, wherein the U2 is a lithium battery charging management chip and is in the model number TP4056 (SOP-8). Carry out charge management control to the lithium cell through lithium electricity charge management chip U2, when beginning to charge, U2 gives the charging signal CHR, MCU control circuit makes feedback and judgement through detecting the CHR signal, and control LED shows that corresponding charging lamp is bright. When the battery is fully charged, the U2 gives a charging signal FULL, and the MCU control circuit makes feedback and judgment by detecting the FULL signal and controls the LED to display that the corresponding FULL-charge lamp is on. The charging current can be adjusted through the resistor, and the charging current can be quickly or slowly charged to adapt to different product requirements.
Still further, the PB5 pin of the control chip U1 is connected with the key circuit. The key circuit consists of switch keys SW and is connected with a singlechip U1. When the SW is pressed once or repeatedly, the U1 recognizes the switch signal and makes a corresponding judgment process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides an overload protection circuit board for small household appliances, characterized by, the circuit board specifically include control circuit, voltage detection circuit, motor drive circuit, current detection circuit, bee calling organ warning circuit, LED show drive circuit and charging circuit:
the control circuit comprises a control chip U1 and a peripheral capacitor C7, a VSS pin of the control chip U1 is grounded, a VDD end of the control chip U1 is connected with a VBAT lithium battery power supply, and the VSS pin and the VDD pin of the control chip U1 are connected in series through a capacitor C7;
the PA5 pin of the control chip U1 is connected with VBAT through a voltage detection circuit, and the voltage detection circuit specifically comprises resistors R3 and R4 and a capacitor C1:
the resistor R3 and the resistor R4 are connected in series, and VBAT is grounded; the negative electrode of the capacitor C1 and the PA5 pin of the control chip U1 are connected through a line between the resistor R3 and the resistor R4, and the positive electrode of the capacitor C1 is grounded;
the TIM2-PWM3 pin of the control chip U1 is connected with a motor driving circuit and a current detection circuit, and the motor driving circuit comprises a PMOS tube Q5, a resistor R7, a diode D2 and a capacitor C9:
the diode D2 and the capacitor C9 are respectively connected in parallel at two ends of the motor M1, the positive electrode of the motor M1 is connected with the D electrode of the PMOS tube Q5, the G electrode of the MOS tube Q5 is connected with the TIM2-PWM3 pin of the control chip U1, the S electrode and the G electrode of the PMOS tube Q5 are connected through a resistor R7, and the S electrode of the MOS tube Q5 is connected with VBAT;
the TIM1-PWM2 pin of the control chip U1 is connected with a buzzer alarm circuit;
and pins PA 0-PB 4 of the control chip U1 are connected with an LED display driving circuit.
2. The circuit board according to claim 1, wherein the current detection circuit comprises resistors R1, R2, R5 and a capacitor C6;
resistor R1 and resistor R2 are connected in parallel to the negative terminal of motor M1;
the PA4/AN2 pin of the control chip U1 is connected with the negative electrode of a capacitor C6, and the positive electrode of the capacitor C6 is grounded; the negative electrode of the capacitor C6 is connected with the negative electrode of the motor M1 through a resistor R5.
3. The circuit board of claim 2, wherein the buzzer warning circuit comprises a buzzer U3, a triode Q6 and a resistor R14;
the base electrode of the triode Q6 is connected with a TIM1-PWM2 pin of a control chip U1 through a resistor R14, the power generation electrode of the triode Q6 is grounded, and the collector electrode of the triode Q6 is connected with VBAT through a buzzer U3.
4. The circuit board of claim 3, wherein the LED display driving circuit comprises transistors Q1-Q4, resistors R9, R10, R11, R19 and 28 independent LEDs.
5. The circuit board of claim 4, wherein the charging circuit comprises a chip U2, a resistor R8, and a capacitor C2.
6. The circuit board of claim 5, wherein the PB5 pin of the control chip U1 is connected with a key circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122275948.6U CN217036740U (en) | 2021-09-19 | 2021-09-19 | Overload protection circuit board for small household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122275948.6U CN217036740U (en) | 2021-09-19 | 2021-09-19 | Overload protection circuit board for small household electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217036740U true CN217036740U (en) | 2022-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122275948.6U Active CN217036740U (en) | 2021-09-19 | 2021-09-19 | Overload protection circuit board for small household electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217036740U (en) |
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2021
- 2021-09-19 CN CN202122275948.6U patent/CN217036740U/en active Active
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