CN220156420U - Control circuit with low-cost power-off protection function - Google Patents
Control circuit with low-cost power-off protection function Download PDFInfo
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- CN220156420U CN220156420U CN202321490039.7U CN202321490039U CN220156420U CN 220156420 U CN220156420 U CN 220156420U CN 202321490039 U CN202321490039 U CN 202321490039U CN 220156420 U CN220156420 U CN 220156420U
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- control circuit
- circuit
- power
- main control
- protection
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 31
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000001960 triggered effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Abstract
The utility model discloses a control circuit with a low-cost power-off protection function, which comprises a main control circuit; the voltage stabilizing circuit, the power-off protection detection circuit and the motor control driving circuit are respectively and electrically connected with the main control circuit; the voltage stabilizing circuit is electrically connected with the main control circuit and the lithium battery respectively; the power-off protection detection circuit is electrically connected with the main control circuit and the lithium battery respectively; the motor control driving circuit is respectively and electrically connected with the main control circuit, the lithium battery and the motor; after the main control circuit is powered on, the voltage value of a pin connected with the power-off protection detection circuit is detected in real time. After the main control circuit is powered on, the voltage value of the pin connected with the power-off protection detection circuit is detected in real time, and whether the power-off protection needs to be triggered is judged, so that the function of low-cost power-off protection is realized.
Description
Technical Field
The utility model relates to the technical field of control circuits, in particular to a control circuit with a low-cost power-off protection function.
Background
In recent years, the market share of rechargeable portable lithium battery electric tool products such as electric drills, electric grinders and the like is rapidly increased; the portable lithium battery electric tool has wide application scene due to the characteristics of portability and small volume. In the use process of some high-power lithium battery electric tools, when the electric quantity of a lithium battery is exhausted, a user can directly detach a lithium battery pack for charging, and possibly forget to reset a power switch of the electric tool, if the user inserts the charged lithium battery pack under the condition that a switch is closed, the electric tool directly starts to work, and possibly injures the user accidentally, in order to solve the problem, the electric tool is generally provided with a power-off protection mechanism, and the currently mainly adopted technical scheme is that two key switches are adopted for processing, one is used as a key switch for signal detection, does not have a self-locking function, the other is used as a main loop switch for overcurrent protection, and has a self-locking function; when the lithium battery pack is plugged into the electric tool to be electrified, the key switch and the main loop switch can detect the motor at the same time so as to work normally; however, two key switches increase the cost and limit certain products with compact structures; therefore, the control circuit with the low-cost power-off protection function is provided and is used for solving the problem that in the prior art, the cost of the power-off protection function of the lithium battery electric tool is high.
Disclosure of Invention
One of the objectives of the present utility model is to provide a control circuit with a low-cost power-off protection function, so as to solve the problem of high power-off protection cost of a lithium battery electric tool in the prior art.
The control circuit with the low-cost power-off protection function can be realized by the following technical scheme:
the utility model relates to a control circuit with a low-cost power-off protection function, which comprises a main control circuit; the voltage stabilizing circuit, the power-off protection detection circuit and the motor control driving circuit are respectively and electrically connected with the main control circuit; the voltage stabilizing circuit is electrically connected with the main control circuit and the lithium battery respectively; the power-off protection detection circuit is electrically connected with the main control circuit and the lithium battery respectively; the motor control driving circuit is respectively and electrically connected with the main control circuit, the lithium battery and the motor; after the main control circuit is powered on, the voltage value of a pin connected with the power-off protection detection circuit is detected in real time.
In one embodiment, the power-off protection detection circuit comprises a resistor R27, a resistor R28, a resistor R32, a capacitor C6 and a diode D4; the capacitor C6, the resistor R27, the resistor R28 and the resistor R32 form an RC differential pulse network.
In one embodiment, the master control chip in the master control circuit is a single chip microcomputer.
In one embodiment, the single-chip microcomputer is PFS122 and includes 8 pins.
In one embodiment, the voltage stabilizing chip in the voltage stabilizing circuit adopts HT7550-2.
In one embodiment, the control circuit with the low-cost power-off protection function further comprises a switch signal detection circuit, wherein the switch signal detection circuit is electrically connected with the main control circuit, the lithium battery and the motor respectively.
Compared with the prior art, the control circuit with the low-cost power-off protection function has the beneficial effects that:
the control circuit with the low-cost power-off protection function forms a differential pulse network through the resistor and the capacitor, and the voltage value of the differential pulse network is detected in real time after the main control circuit is powered on; when the voltage value is not zero, judging that the device is abnormally used at the moment, and triggering power-off protection; when the voltage value is zero, judging that the state is normal at the moment, and controlling the motor by the main control circuit to control the driving circuit to work so as to drive the motor to work, thereby realizing the function of low-cost power-off protection; meanwhile, the utility model only needs simple resistor and capacitor, has the characteristics of low cost and high reliability, and is beneficial to compact design of the electric tool.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an electrical connection structure of a control circuit with a low-cost power-off protection function, comprising a main control circuit, a voltage stabilizing circuit, a switch signal detection circuit, a power-off protection detection circuit and a motor control driving circuit;
FIG. 2 is a circuit diagram of a master circuit in the control circuit with low cost power down protection of FIG. 1 according to the present utility model;
FIG. 3 is a circuit diagram of a voltage regulator circuit in the control circuit with low-cost power-down protection according to the present utility model shown in FIG. 1;
FIG. 4 is a circuit diagram of a switching signal detection circuit in the control circuit with low-cost power-down protection according to the present utility model shown in FIG. 1;
FIG. 5 is a circuit diagram of a control circuit interrupt electrical protection detection circuit with low cost power down protection of the present utility model shown in FIG. 1;
fig. 6 is a circuit diagram of a motor control driving circuit in the control circuit with a low-cost power-off protection function according to the present utility model shown in fig. 1.
The figures indicate: 11, a main control circuit; 12, a voltage stabilizing circuit; 13, a switching signal detection circuit; 14, a power-off protection detection circuit; 15, a motor control driving circuit; 20, a lithium battery; 30, a motor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model 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 utility model, as 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 made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the control circuit with low-cost power-off protection function of the present utility model is mainly applied to an electric tool, and includes a main control circuit 11, a voltage stabilizing circuit 12, a switching signal detecting circuit 13, a power-off protection detecting circuit 14 and a motor control driving circuit 15; the main control circuit 11 is electrically connected with the voltage stabilizing circuit 12, the switch signal detection circuit 13, the power-off protection detection circuit 14 and the motor control driving circuit 15 respectively; the voltage stabilizing circuit 12 is electrically connected with the lithium battery 20 and is used for stabilizing voltage of the lithium battery 20, and the voltage stabilizing circuit 12 supplies power to the main control circuit 11; the switch signal detection circuit 13 is electrically connected with the lithium battery 20 and the motor 30 respectively, and can monitor the communication condition of the lithium battery 20 and the motor 30 in real time; the power-off protection detection circuit 14 is electrically connected with the lithium battery 20, and performs power-off protection on the motor 30; the motor control driving circuit 15 is electrically connected to the lithium battery 20 and the motor, respectively, and drives the motor 30 to operate.
Referring to fig. 1 and fig. 2, in this embodiment, a single chip microcomputer is adopted as a main control chip in the main control circuit 11, and the specific model is PFS122, and the main control chip includes 8 pins.
Referring to fig. 1 and 3, in the present embodiment, the specific model of the voltage stabilizing chip in the voltage stabilizing circuit 12 is HT7550-2, which stabilizes the output voltage of the lithium battery 20 to 5V.
Referring to fig. 1 and 4, fig. 4 is a specific circuit diagram of the switch signal detection circuit 13, which is used for monitoring the communication condition between the lithium battery 20 and the motor 30.
Referring to fig. 1 and 5, in the present embodiment, the power-off protection detection circuit 14 includes a resistor R27, a resistor R28, a resistor R32, a capacitor C6, and a diode D4; the capacitor C6, the resistor R27, the resistor R28 and the resistor R32 form an RC differential pulse network; when the lithium battery 20 is plugged in the state that the switch is closed, an RC differential pulse is generated by the capacitor C6, the voltage of a pin connected with the power-off protection detection circuit 14 is detected immediately after the main control circuit 11 is electrified, if the voltage is not zero, the abnormal use is indicated at the moment, the power-off protection is triggered, and the main control circuit 11 controls the motor control driving circuit 15 to be not operated; when the lithium battery 20 is plugged in first and then the switch is closed, the pulse at the capacitor C6 is triggered first and then the switch is closed when the system of the main control circuit 11 is powered on, the voltage of the connection pin between the main control circuit 11 and the power-off protection detection circuit 14 is detected to be zero, and the state is judged to be normal at this time, and the main control circuit 11 controls the motor control driving circuit 15 to work so as to drive the motor 30 to work normally.
Referring to fig. 1 and 6, fig. 6 is a specific circuit diagram of the motor control driving circuit 15, which drives the motor 30 to operate.
It should be noted that, the control circuit with the over-temperature protection function of the present utility model supplies power to the main control circuit 11 through the voltage stabilizing circuit 12; the main control circuit 11 detects the voltage value of the pin connected with the power-off protection detection circuit 14 in real time after power-on, and judges whether power-off protection needs to be triggered, thereby realizing the function of low-cost power-off protection.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (6)
1. A control circuit with low-cost power-off protection function is characterized by comprising a main control circuit; the voltage stabilizing circuit, the power-off protection detection circuit and the motor control driving circuit are respectively and electrically connected with the main control circuit; the voltage stabilizing circuit is electrically connected with the main control circuit and the lithium battery respectively; the power-off protection detection circuit is electrically connected with the main control circuit and the lithium battery respectively; the motor control driving circuit is respectively and electrically connected with the main control circuit, the lithium battery and the motor; after the main control circuit is powered on, the voltage value of a pin connected with the power-off protection detection circuit is detected in real time.
2. The control circuit with low-cost power-off protection function according to claim 1, wherein the power-off protection detection circuit comprises a resistor R27, a resistor R28, a resistor R32, a capacitor C6 and a diode D4; the capacitor C6, the resistor R27, the resistor R28 and the resistor R32 form an RC differential pulse network.
3. The control circuit with the low-cost power-off protection function according to claim 2, wherein a master control chip in the master control circuit adopts a single chip microcomputer.
4. A control circuit with low-cost power-off protection function according to claim 3, wherein the single-chip microcomputer is PFS122 and comprises 8 pins.
5. The control circuit with low-cost power-off protection function according to claim 2, wherein the voltage stabilizing chip in the voltage stabilizing circuit is of a type HT7550-2.
6. The control circuit with low-cost power-off protection according to any one of claims 1 to 5, further comprising a switching signal detection circuit electrically connected to the main control circuit, the lithium battery, and the motor, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321490039.7U CN220156420U (en) | 2023-06-13 | 2023-06-13 | Control circuit with low-cost power-off protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321490039.7U CN220156420U (en) | 2023-06-13 | 2023-06-13 | Control circuit with low-cost power-off protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220156420U true CN220156420U (en) | 2023-12-08 |
Family
ID=89012256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321490039.7U Active CN220156420U (en) | 2023-06-13 | 2023-06-13 | Control circuit with low-cost power-off protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220156420U (en) |
-
2023
- 2023-06-13 CN CN202321490039.7U patent/CN220156420U/en active Active
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