CN215728701U - Power supply detection circuit and electric appliance - Google Patents
Power supply detection circuit and electric appliance Download PDFInfo
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- CN215728701U CN215728701U CN202121611136.8U CN202121611136U CN215728701U CN 215728701 U CN215728701 U CN 215728701U CN 202121611136 U CN202121611136 U CN 202121611136U CN 215728701 U CN215728701 U CN 215728701U
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Abstract
The utility model relates to a power supply detection circuit and an electric appliance. The power supply detection circuit comprises a series resistance voltage division circuit, a capacitor C and an MOS (metal oxide semiconductor) tube Q, wherein the first end of the series resistance voltage division circuit is connected with a first power supply end B +, and the second end of the series resistance voltage division circuit is grounded; the capacitor C is connected with one resistor of the series resistor voltage division circuit in parallel, the grid electrode of the MOS tube Q is connected with one voltage division output end of the series resistor voltage division circuit, the source electrode of the MOS tube Q is grounded, and the drain electrode of the MOS tube Q outputs a detection signal. The power supply detection circuit provided by the utility model is added with the capacitor as a buffer design, can generate different signals according to the state of the power supply end, provides accurate reference for subsequent control, and improves the safety of an electric appliance.
Description
Technical Field
The utility model relates to the field of power supply state monitoring, in particular to a power supply detection circuit and an electric appliance.
Background
The power supply of the electric appliance provides energy for the whole equipment, and the power supply state of the power supply end is related to the running state of the whole electric appliance, so that the accurate acquisition of the power supply state of the power supply is of great importance. In the prior art, a voltage division circuit is used for directly acquiring the sampling voltage of a power supply so as to determine the power supply state of the power supply, and the mode is direct sampling without buffer design and is not beneficial to control of an electric appliance.
SUMMERY OF THE UTILITY MODEL
The present invention provides a power supply detection circuit and an electrical appliance, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the power supply detection circuit is constructed and comprises a series resistance voltage division circuit, a capacitor C and an MOS (metal oxide semiconductor) tube Q, wherein the first end of the series resistance voltage division circuit is connected with a first power supply end B +, and the second end of the series resistance voltage division circuit is grounded; the capacitor C is connected with one resistor of the series resistor voltage division circuit in parallel, the grid electrode of the MOS tube Q is connected with one voltage division output end of the series resistor voltage division circuit, the source electrode of the MOS tube Q is grounded, and the drain electrode of the MOS tube Q outputs a detection signal.
Furthermore, the power supply detection circuit further comprises a pull-up resistor R4, and the drain of the MOS transistor Q is connected to the second power supply terminal VDD through the pull-up resistor R4.
Further, in the power supply detection circuit of the present invention, the series resistor voltage-dividing circuit includes a resistor R11, a resistor R12, and a resistor R13, a first end of the resistor R11 is connected to the first power supply terminal B +, a second end of the resistor R11 is connected to a first end of the resistor R12, a second end of the resistor R12 is connected to a first end of the resistor R13, and a second end of the resistor R13 is grounded; the second end of the resistor R12 is connected with the grid electrode of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R11.
Further, in the power supply detection circuit of the present invention, the series resistor voltage-dividing circuit includes a resistor R21, a resistor R22, and a resistor R23, a first end of the resistor R21 is connected to the first power supply terminal B +, a second end of the resistor R21 is connected to a first end of the resistor R22, a second end of the resistor R22 is connected to a first end of the resistor R23, and a second end of the resistor R23 is grounded; the second end of the resistor R12 is connected with the grid electrode of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R22.
Further, in the power supply detection circuit of the present invention, the series resistance voltage-dividing circuit includes a resistor R31 and a resistor R32, a first end of the resistor R31 is connected to the first power supply terminal B +, a second end of the resistor R31 is connected to a first end of the resistor R32, and a second end of the resistor R32 is grounded; the second end of the resistor R31 is connected with the grid electrode of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R32.
Further, in the power supply detection circuit of the present invention, the first power supply terminal B + is a battery pack or a dc power supply circuit.
In addition, the utility model also provides an electric appliance which comprises the power supply detection circuit. Alternatively, the appliance is a power tool.
The power supply detection circuit and the electric appliance have the following beneficial effects that: the power supply detection circuit provided by the utility model is added with the capacitor as a buffer design, can generate different signals according to the state of the power supply end, provides accurate reference for subsequent control, and improves the safety of an electric appliance.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a circuit diagram of a power supply detection circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a power supply detection circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a power supply detection circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a power supply detection circuit according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the power supply detection circuit of this embodiment includes a series resistor voltage-dividing circuit, a capacitor C, and a MOS transistor Q, a first end of the series resistor voltage-dividing circuit is connected to the first power supply terminal B +, and a second end of the series resistor voltage-dividing circuit is grounded. Alternatively, the first power supply terminal B + is a battery pack or a dc power supply circuit. The series resistance voltage division circuit comprises at least two resistors, all the resistors are connected in series, and the capacitor C is connected with one of the resistors of the series resistance voltage division circuit in parallel. The grid of MOS pipe Q is connected with one voltage division output end of the series resistance voltage division circuit, the source electrode of MOS pipe Q is grounded, and the drain electrode of MOS pipe Q outputs a detection signal. The charging process, the discharging process and the full-charging state of the capacitor C can affect the voltage division of each resistor in the series resistor voltage division circuit, so that the switching state of the MOS transistor Q is affected, and different detection signals are output; alternatively, the detection signal may be a high level and pulse signal. The external control circuit can determine the current state of the first power supply end B + according to the output detection signal, and further realize corresponding control. The power supply detection circuit of the electric appliance is added with the capacitor as a buffer design, different signals can be generated according to the state of the power supply end, accurate reference is provided for follow-up control, and the safety of the electric appliance is improved.
In a preferred embodiment, referring to fig. 2, the power supply detection circuit of this embodiment further includes a pull-up resistor R4, and the drain of the MOS transistor Q is connected to the second power supply terminal VDD through the pull-up resistor R4. Further, the series resistor voltage-dividing circuit comprises a resistor R11, a resistor R12 and a resistor R13, wherein the first end of the resistor R11 is connected with the first power supply end B +, the second end of the resistor R11 is connected with the first end of the resistor R12, the second end of the resistor R12 is connected with the first end of the resistor R13, and the second end of the resistor R13 is grounded; the second end of the resistor R12 is connected with the gate of the MOS transistor Q. The capacitor C is connected in parallel with the resistor R11. In this embodiment, the resistance relationships among the resistor R11, the resistor R12, and the resistor R13 should satisfy: when the capacitor C is fully charged, the voltage divided by the resistor R11, the resistor R12 and the resistor R13 at the gate of the MOS transistor Q cannot turn on the MOS transistor Q, and when the capacitor C is not fully charged, the voltage divided by the resistor R11, the resistor R12 and the resistor R13 at the gate of the MOS transistor Q can turn on the MOS transistor Q. That is, when the first power supply terminal B + is powered again after stopping supplying power, for example, when the battery pack is replaced, the voltage dividing circuit formed by the resistor R12 and the resistor R13 charges the capacitor C, and at the same time, the voltage dividing circuit formed by the resistor R12 and the resistor R13 turns on the MOS transistor Q, and the MOS transistor Q is turned off after the capacitor C is fully charged. That is to say, the MOS transistor Q changes from the off state to the on state and then to the off state after the first power supply terminal B + is replaced, a pulse signal is generated in the process, and the external control circuit receives the pulse signal, which indicates that the first power supply terminal B + is replaced this time. The power supply detection circuit of the electric appliance is added with the capacitor as a buffer design, different signals can be generated according to the state of the power supply end, accurate reference is provided for follow-up control, and the safety of the electric appliance is improved.
In a preferred embodiment, referring to fig. 3, the power supply detection circuit of this embodiment further includes a pull-up resistor R4, and the drain of the MOS transistor Q is connected to the second power supply terminal VDD through the pull-up resistor R4. Further, the series resistor voltage-dividing circuit comprises a resistor R21, a resistor R22 and a resistor R23, wherein the first end of the resistor R21 is connected with the first power supply end B +, the second end of the resistor R21 is connected with the first end of the resistor R22, the second end of the resistor R22 is connected with the first end of the resistor R23, and the second end of the resistor R23 is grounded; the second end of the resistor R12 is connected with the gate of the MOS transistor Q. The capacitor C is connected in parallel with the resistor R22. In this embodiment, the resistance relationships among the resistor R21, the resistor R22, and the resistor R23 should satisfy: when the capacitor C is fully charged, the voltage divided by the resistor R21, the resistor R22 and the resistor R23 at the gate of the MOS transistor Q cannot turn on the MOS transistor Q, and when the capacitor C is not fully charged, the voltage divided by the resistor R21, the resistor R22 and the resistor R23 at the gate of the MOS transistor Q can turn on the MOS transistor Q. That is, when the first power supply terminal B + is powered again after stopping supplying power, for example, when the battery pack is replaced, the voltage dividing circuit formed by the resistor R21 and the resistor R23 charges the capacitor C, and at the same time, the voltage dividing circuit formed by the resistor R21 and the resistor R23 turns on the MOS transistor Q, and the MOS transistor Q is turned off after the capacitor C is fully charged. That is to say, the MOS transistor Q changes from the off state to the on state and then to the off state after the first power supply terminal B + is replaced, a pulse signal is generated in the process, and the external control circuit receives the pulse signal, which indicates that the first power supply terminal B + is replaced this time. The power supply detection circuit of the electric appliance is added with the capacitor as a buffer design, different signals can be generated according to the state of the power supply end, accurate reference is provided for follow-up control, and the safety of the electric appliance is improved.
In a preferred embodiment, referring to fig. 4, the power supply detection circuit of this embodiment further includes a pull-up resistor R4, and the drain of the MOS transistor Q is connected to the second power supply terminal VDD through the pull-up resistor R4. Further, the series resistor voltage-dividing circuit comprises a resistor R31 and a resistor R32, wherein a first end of the resistor R31 is connected with a first power supply end B +, a second end of the resistor R31 is connected with a first end of a resistor R32, and a second end of the resistor R32 is grounded; the second end of the resistor R31 is connected with the grid of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R32. When the power supply circuit 20 stops supplying power and then supplies power again, for example, a battery pack is replaced, the voltage dividing circuit composed of the resistor R31 and the resistor R32 charges the capacitor C, the gate of the MOS transistor Q is at a low level before the capacitor C is charged, the MOS transistor Q is disconnected, and the external control circuit detects a high level. After the capacitor C is charged, the gate of the MOS transistor Q is at a high level, the MOS transistor Q is turned on, and the external control circuit detects the low level, that is, the power supply detection circuit 30 generates a pulse signal before and after the capacitor C is charged. When the external control circuit detects the pulse signal, the power supply circuit 20 stops supplying power and then supplies power again. The power supply detection circuit of the electric appliance is added with the capacitor as a buffer design, different signals can be generated according to the state of the power supply end, accurate reference is provided for follow-up control, and the safety of the electric appliance is improved.
In a preferred embodiment, the electric appliance of the present embodiment includes the power supply detection circuit as in the above-described embodiments. Alternatively, the appliance is a power tool. The power supply detection circuit of the electric appliance is added with the capacitor as a buffer design, different signals can be generated according to the state of the power supply end, accurate reference is provided for follow-up control, and the safety of the electric appliance is improved.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (8)
1. A power supply detection circuit is characterized by comprising a series resistance voltage division circuit, a capacitor C and an MOS (metal oxide semiconductor) tube Q, wherein the first end of the series resistance voltage division circuit is connected with a first power supply end B +, and the second end of the series resistance voltage division circuit is grounded; the capacitor C is connected with one resistor of the series resistor voltage division circuit in parallel, the grid electrode of the MOS tube Q is connected with one voltage division output end of the series resistor voltage division circuit, the source electrode of the MOS tube Q is grounded, and the drain electrode of the MOS tube Q outputs a detection signal.
2. The power supply detection circuit of claim 1, further comprising a pull-up resistor R4, wherein the drain of the MOS transistor Q is connected to the second power supply terminal VDD through the pull-up resistor R4.
3. The power supply detection circuit according to claim 1 or 2, wherein the series resistor voltage divider circuit comprises a resistor R11, a resistor R12 and a resistor R13, a first end of the resistor R11 is connected to the first power supply terminal B +, a second end of the resistor R11 is connected to a first end of the resistor R12, a second end of the resistor R12 is connected to a first end of the resistor R13, and a second end of the resistor R13 is grounded; the second end of the resistor R12 is connected with the grid electrode of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R11.
4. The power supply detection circuit according to claim 1 or 2, wherein the series resistor voltage divider circuit comprises a resistor R21, a resistor R22 and a resistor R23, a first end of the resistor R21 is connected to the first power supply terminal B +, a second end of the resistor R21 is connected to a first end of the resistor R22, a second end of the resistor R22 is connected to a first end of the resistor R23, and a second end of the resistor R23 is grounded; the second end of the resistor R12 is connected with the grid electrode of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R22.
5. The power supply detection circuit according to claim 1 or 2, wherein the series resistor voltage divider circuit comprises a resistor R31 and a resistor R32, a first end of the resistor R31 is connected to the first power supply terminal B +, a second end of the resistor R31 is connected to a first end of the resistor R32, and a second end of the resistor R32 is grounded; the second end of the resistor R31 is connected with the grid electrode of the MOS transistor Q; the capacitor C is connected in parallel with the resistor R32.
6. The power supply detection circuit of claim 1, wherein the first power supply terminal B + is a battery or a dc power supply circuit.
7. An electrical appliance comprising a power supply detection circuit as claimed in any one of claims 1 to 6.
8. The electrical appliance according to claim 7, characterized in that the electrical appliance is a power tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121611136.8U CN215728701U (en) | 2021-07-15 | 2021-07-15 | Power supply detection circuit and electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121611136.8U CN215728701U (en) | 2021-07-15 | 2021-07-15 | Power supply detection circuit and electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215728701U true CN215728701U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121611136.8U Active CN215728701U (en) | 2021-07-15 | 2021-07-15 | Power supply detection circuit and electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215728701U (en) |
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2021
- 2021-07-15 CN CN202121611136.8U patent/CN215728701U/en active Active
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