CN213402520U - Electric tool control circuit and electric tool - Google Patents
Electric tool control circuit and electric tool Download PDFInfo
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- CN213402520U CN213402520U CN202022391967.0U CN202022391967U CN213402520U CN 213402520 U CN213402520 U CN 213402520U CN 202022391967 U CN202022391967 U CN 202022391967U CN 213402520 U CN213402520 U CN 213402520U
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Abstract
The utility model discloses an electric tool control circuit and electric tool, include: a power supply, a first resistor, a second resistor, a power-on control switch, a state control switch, a tool control switch, a controller, a first diode, a second diode, a fifth resistor and a third diode, wherein, the first diode is a voltage stabilizing diode, the over-discharge protection function of the battery of the electric tool is realized through the voltage stabilizing diode, wherein, by utilizing the characteristic of the voltage stabilizing diode, when the switch is in a closed state and the voltage of the power supply is lower than the preset voltage threshold value, the voltage at two ends of the voltage stabilizing diode is equivalent to an open circuit when the voltage is lower than the voltage stabilizing value, meanwhile, the voltage detection end of the controller also detects that the voltage of the driving motor is lower than the threshold value, the state control switch is closed, therefore, the power-on control switch is naturally disconnected, the problem that when the trigger of the electric tool is clamped or abnormally triggered is solved, the problem of continuous discharge under the condition that the user does not know the situation is solved, and the technical effect of over-discharge protection of the battery is achieved.
Description
Technical Field
The utility model belongs to the technical field of electric tool, especially, relate to an electric tool control circuit and electric tool.
Background
Currently, electric tools using batteries, power is supplied by lithium batteries. The lithium battery has the minimum discharge requirement, and the service life of the lithium battery can be seriously influenced by over discharge, even the lithium battery is directly scrapped. Due to cost constraints and versatility considerations, most current power tools do not have over-discharge protection for the lithium battery itself, and therefore require a controller connected thereto to perform the over-discharge protection function.
At present, the common practice is that after a trigger is released and is delayed for a certain time, the trigger enters an ultra-low power consumption state. However, under special conditions, for example, the trigger is stuck or the electric tool is stopped after triggering an abnormal protection mechanism, a user mistakenly thinks that the trigger is loosened, so that the trigger is not loosened all the time, and at this time, the controller always consumes power, so that the lithium battery is over-discharged, the service life of the lithium battery is shortened, or the lithium battery is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned technical problem, provide an electric tool control circuit and electric tool, the technical scheme of the utility model is that:
a power tool control circuit comprising: the power supply, the first resistor, the second resistor, the power-on control switch, the state control switch, the tool control switch, the controller, the first diode, the second diode, the fifth resistor and the third diode;
the negative pole of the power supply is grounded, the positive pole of the power supply is electrically connected with the input end of the power-on control switch, the output end of the power-on control switch is used as a power supply end and is used for supplying power for the non-power part of the electric tool, the output end of the power-on control switch is also electrically connected with the voltage detection end of the controller, the control end of the power-on control switch is respectively and electrically connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is electrically connected with the positive pole of the power supply, the other end of the second resistor is grounded through a state control switch, the control end of the state control switch is electrically connected with the control output end of the controller, the other end of the second resistor is also electrically connected with the negative pole of a first diode, the positive pole of the first diode is electrically connected with the positive pole of a second diode, the negative, The anode of the third diode is electrically connected, the other end of the fifth resistor is electrically connected with the voltage output end of the controller, and the cathode of the third diode is electrically connected with the cathode of the second diode;
wherein, the first diode is a voltage stabilizing diode;
the tool control switch is used for controlling a switch of the electric tool;
the controller is used for controlling the on-off of the state control switch according to the electric signals of the voltage detection end and the state detection end.
In one embodiment, the power-on control switch further comprises a first capacitor and a second capacitor, the output end of the power-on control switch is respectively and electrically connected with one end of the first capacitor and one end of the second capacitor, and the other end of the first capacitor and the other end of the second capacitor are grounded.
In one embodiment, the controller further comprises a third resistor and a fourth resistor, the control output end of the controller is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with the control end of the state control switch and one end of the fourth resistor respectively, and the other end of the fourth resistor is grounded.
In one embodiment, the controller is used for controlling the switch of the state control switch according to the electric signals of the voltage detection end and the state detection end:
when the electric signal of the power-on end is lower than the threshold value, the state control switch is controlled to be switched off so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state;
when the detection end detects that the tool control switch is closed and the electric signal of the power-on end is not lower than the threshold value, the state control switch is controlled to be closed so as to maintain the power-on state of the electric tool;
when the detection end detects that the tool control switch is switched off and the electric signal of the power-on end is not lower than the threshold value, the control state control switch is switched off so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state.
In one embodiment, the controller is further configured to control the delay:
when the electric signal of the power-on end is lower than the threshold value, the state control switch is controlled to be switched off after delaying the first preset time so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state;
and when the detection end detects that the tool control switch is switched off and the electric signal of the power-on end is not lower than the threshold value, the state control switch is controlled to be switched off after delaying the second preset time so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state.
A power tool comprising a power tool control circuit as described in any one of the above embodiments.
Compared with the prior art, the utility model have following advantage and positive effect:
the utility model realizes the over-discharge protection function of the battery of the electric tool through the voltage-stabilizing diode, wherein, when the voltage at two ends is lower than the stabilized voltage value, the reverse current is 0, when the voltage at two ends is higher than the stabilized voltage value, the reverse current is not 0, and at this point, when the power supply voltage is lower than the preset voltage threshold in the closed state of the switch, so that the voltage at two ends of the voltage stabilizing diode is lower than the voltage stabilizing value, the reverse current is 0, which is equivalent to open circuit, meanwhile, the voltage detection end of the controller also detects that the voltage of the driving motor is lower than the threshold value, the state control switch is closed, therefore, the power-on control switch is naturally disconnected, the over-discharge of the battery is prevented, the problem that when the trigger of the electric tool is clamped or abnormally triggered is solved, the electric tool has the technical effect of protecting the over-discharge of the battery due to the problem of continuous discharge under the condition that a user does not know.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
Fig. 1 is a schematic circuit diagram of a control circuit of an electric tool according to the present invention;
fig. 2 is a working process diagram of a control circuit of an electric tool according to the present invention.
Detailed Description
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
The following describes an electrical safety situation multidimensional parameter sensing circuit according to the present invention in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the present application provides an electric tool control circuit comprising: a power supply Battery, a first resistor R1, a second resistor R2, a power-on control switch Q1, a state control switch Q2, a tool control switch S1, a controller System, a first diode D1, a second diode D2, a fifth resistor R5 and a third diode D3;
the negative pole of the power supply is grounded, the positive pole of the power supply is electrically connected with the input end of the power-on control switch, the output end of the power-on control switch is used as a power supply end and is used for supplying power for the non-power part of the electric tool, the output end of the power-on control switch is also electrically connected with the voltage detection end of the controller, the control end of the power-on control switch is respectively and electrically connected with one end of a first resistor and one end of a second resistor, the other end of the first resistor is electrically connected with the positive pole of the power supply, the other end of the second resistor is grounded through a state control switch, the control end of the state control switch is electrically connected with the control output end of the controller, the other end of the second resistor is also electrically connected with the negative pole of a first diode, the positive pole of the first diode is electrically connected with the positive pole of a second diode, the negative pole, the state detection end of the controller is respectively electrically connected with one end of a fifth resistor and the anode of a third diode, the other end of the fifth resistor is electrically connected with the voltage output end of the controller, and the cathode of the third diode is electrically connected with the cathode of the second diode;
wherein, the first diode is a voltage stabilizing diode;
the tool control switch is used for controlling a switch of the electric tool;
the controller is used for controlling the on-off of the state control switch according to the electric signals of the voltage detection end and the state detection end.
The present embodiment will now be described in detail, but is not limited thereto.
The present embodiments are applicable to power tool control and battery over-discharge protection, where the power tool includes, but is not limited to, power tools operated by a battery-powered motor, and more generally, other power tools powered by a battery.
Referring to fig. 1, the present embodiment further includes a first capacitor C1, a second capacitor C2, a third resistor R3, and a fourth resistor R4: the output end of the power-on control switch is respectively and electrically connected with one end of the first capacitor and one end of the second capacitor, and the other end of the first capacitor and the other end of the second capacitor are grounded; the control output end of the controller is electrically connected with one end of a third resistor, the other end of the third resistor is respectively electrically connected with the control end of the state control switch and one end of a fourth resistor, and the other end of the fourth resistor is grounded.
The power-on control switch in this embodiment adopts a PNP triode for controlling the on and off between a power supply and a power consumption unit of the electric tool, where the Vsys electrical signal is to supply power to a non-power part of the electric tool, the non-power part of the electric tool is, for example, a control circuit, a display indication circuit, a key operation circuit, etc., the power part of the electric tool is, for example, a motor power driving circuit, and similarly, the PNP triode can also be replaced by a PMOS or other switching element. The state control switch of this embodiment adopts an NPN transistor to control whether the power-on state is maintained, and its path can maintain the power-on control switch in a path state all the time, that is, maintain the power-on state of the electric power tool, otherwise, the voltage across the zener diode at the first diode determines the on and off of the power-on control switch (see the following description for specific principle), and similarly, the NPN transistor can also be replaced by an NMOS or other switching devices. The tool control switch of the present embodiment is a push switch, such as a trigger switch of a control switch in a general electric tool, and may be an electric control switch.
The first resistor and the second resistor of this embodiment are used in combination for driving control of the power-on control switch, and in the same principle, the third resistor and the fourth resistor are used in combination for driving control of the state control switch, specifically, the first resistor, the second resistor, the third resistor and the fourth resistor of this embodiment are all set for matching with the power-on control switch and the switch element adopted by the state control switch, and more broadly, this embodiment can adjust the control related circuit design corresponding to the combination according to the specific switch element type.
The first capacitor and the third capacitor of this embodiment are set at the output end of the power-on control switch, so as to play a role in stabilizing voltage.
The fifth resistor and the third diode of this embodiment constitute a detection circuit for detecting the on-off state of the tool control switch, and the voltage output end of the controller of this embodiment can output a 5V power supply, wherein when the tool control switch is in the on state, the 5V power supply output by the controller forms a path through the fifth resistor, the third diode and the tool control switch, at this time, the controller receives an electrical signal at a low level, whereas when the tool control switch is in the off state, because the open circuit controller receives an electrical signal at a high level, thus, the function of detecting the on-off state of the tool control switch is realized.
The most important point of this embodiment is that the first diode is a zener diode, and the zener diode has the following characteristics: when the voltage at two ends of the power tool is lower than the regulated voltage value, the reverse current is 0, when the voltage at two ends of the power tool is higher than the regulated voltage value, the reverse current is not 0, wherein the regulated voltage value can be determined by the design of a peripheral circuit. The second diode and the third diode of this embodiment are common diodes, and mainly play a role of unidirectional conduction in this embodiment.
Referring to fig. 1 and 2, the operation principle of the present embodiment will now be described in conjunction with the operation process.
After the electric tool control circuit is initialized, assuming that the battery is in a full-charge state at the moment, namely the battery voltage is greater than the threshold voltage corresponding to the ultra-low POWER consumption state, if the tool control switch S1 is closed, the voltage at two ends of the voltage stabilizing diode D1 is greater than the voltage stabilizing value, a reverse current is formed, so that the POWER-on control switch Q1 is opened, the electric tool control circuit normally outputs an electric signal Vsys for driving the electric tool, meanwhile, the control detects that the electric signal Vsys is greater than the threshold voltage corresponding to the ultra-low POWER consumption state, POWER _ LOCK outputs a high level, so that the state control switch is closed, so as to maintain the POWER-on state, continuously output the electric signal Vsys, and drive the electric tool to.
In normal use situations, i.e. in the absence of an anomaly of the electric tool:
when the battery is still sufficient and the tool control switch S1 is turned off, and the controller detects the off state, POWER _ LOCK outputs a low level, so that the state control switch Q2 is turned off, and meanwhile, because the tool control switch S1 is turned off, the voltage across the zener diode D1 is lower than the regulated voltage value due to the open circuit, that is, the reverse current is 0, which is equivalent to the open circuit, the POWER-on control switch Q1 is turned off comprehensively, so that the output of the electrical signal Vsys for driving the electric tool is stopped, and the electric tool enters an ultra-low POWER consumption state to save electric energy;
when the battery POWER is used to be lower than the threshold voltage, namely the controller detects that the electrical signal Vsys is lower than the threshold voltage, the POWER _ LOCK outputs a low level, so that the state control switch Q2 is switched off, meanwhile, as the POWER supply voltage of the tool is used to be reduced by a certain threshold value, the voltage at two ends of the voltage stabilizing diode D1 is lower than a voltage stabilizing value, namely, the reverse current is 0, which is equivalent to circuit breaking, the POWER-on control switch Q1 is switched off comprehensively, thereby realizing that the electrical signal Vsys for stopping outputting and driving the electric tool is ultralow, and entering a POWER consumption state to prevent the battery from being over-discharged;
in the case of abnormal use, such as a failure of the tool control switch, which causes the user to not know that the tool control switch is not turned off, so that the electric tool is still continuously used without knowing, as described above, when the battery POWER is used to be lower than the threshold voltage, that is, the controller detects that the electric signal Vsys is lower than the threshold voltage, POWER _ LOCK outputs a low level, so that the state control switch Q2 is turned off, and since the tool POWER voltage has been used to drop by a certain threshold value, so that the voltage across the zener diode D1 is lower than the zener value, that is, the reverse current is 0, which corresponds to an open circuit, the POWER-up control switch Q1 is turned off in combination, thereby stopping the output of the electric signal Vsys for driving the electric tool, thereby entering an ultra-low POWER consumption state to prevent the battery.
Preferably, when the controller controls the switching element, a switching delay may be set to accurately determine a current state of the control circuit of the electric tool, so as to prevent control abnormality caused by some interference signals, and in particular, referring to fig. 2, when the electrical signal at the power-on end is lower than a threshold value, the control state control switch is turned off after a first preset time is delayed, so as to turn off the power-on state of the electric tool to enter an ultra-low power consumption state; and when the detection end detects that the tool control switch is switched off and the electric signal of the power-on end is not lower than the threshold value, the state control switch is controlled to be switched off after delaying the second preset time so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state.
The present application further provides a power tool including a power tool control circuit as described in any of the above embodiments.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (6)
1. A power tool control circuit, comprising: the power supply, the first resistor, the second resistor, the power-on control switch, the state control switch, the tool control switch, the controller, the first diode, the second diode, the fifth resistor and the third diode;
the negative pole of the power supply is grounded, the positive pole of the power supply is electrically connected with the input end of the power-on control switch, the output end of the power-on control switch is used as a power supply end and is used for supplying power for the non-power part of the electric tool, the output end of the power-on control switch is also electrically connected with the voltage detection end of the controller, the control end of the power-on control switch is respectively electrically connected with one end of the first resistor and one end of the second resistor, the other end of the first resistor is electrically connected with the positive pole of the power supply, the other end of the second resistor is grounded through the state control switch, the control end of the state control switch is electrically connected with the control output end of the controller, the other end of the second resistor is also electrically connected with the negative pole of the first diode, and the positive pole of the first diode is electrically connected with the positive pole of the, the negative electrode of the second diode is grounded through the tool control switch, the state detection end of the controller is respectively electrically connected with one end of the fifth resistor and the positive electrode of the third diode, the other end of the fifth resistor is electrically connected with the voltage output end of the controller, and the negative electrode of the third diode is electrically connected with the negative electrode of the second diode;
the first diode is a voltage stabilizing diode;
wherein the tool control switch is used for controlling a switch of the electric tool;
the controller is used for controlling the switch of the state control switch according to the electric signals of the voltage detection end and the state detection end.
2. The electric tool control circuit according to claim 1, further comprising a first capacitor and a second capacitor, wherein the output terminal of the power-on control switch is electrically connected to one end of the first capacitor and one end of the second capacitor, respectively, and the other end of the first capacitor and the other end of the second capacitor are grounded.
3. The electric tool control circuit according to claim 1, further comprising a third resistor and a fourth resistor, wherein the control output terminal of the controller is electrically connected to one end of the third resistor, the other end of the third resistor is electrically connected to the control terminal of the state control switch and one end of the fourth resistor, respectively, and the other end of the fourth resistor is grounded.
4. The electric tool control circuit according to any one of claims 1 to 3, wherein the controller is configured to control the switch of the state control switch according to the electric signals of the voltage detection terminal and the state detection terminal:
when the electric signal of the power-on end is lower than a threshold value, the state control switch is controlled to be switched off so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state;
when the detection end detects that the tool control switch is closed and the electric signal of the power-on end is not lower than a threshold value, controlling the state control switch to be closed so as to maintain the power-on state of the electric tool;
and when the detection end detects that the tool control switch is switched off and the electric signal of the power-on end is not lower than a threshold value, the state control switch is controlled to be switched off so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state.
5. The power tool control circuit of claim 4, wherein the controller is further configured to control a delay time:
when the electric signal of the power-on end is lower than a threshold value, the state control switch is controlled to be switched off after delaying a first preset time so as to switch off the power-on state of the electric tool and enter an ultra-low power consumption state;
and when the detection end detects that the tool control switch is switched off and the electric signal of the power-on end is not lower than a threshold value, the state control switch is controlled to be switched off after delaying a second preset time so as to switch off the power-on state of the electric tool and enter the ultra-low power consumption state.
6. An electric power tool characterized by comprising the electric power tool control circuit according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022391967.0U CN213402520U (en) | 2020-10-23 | 2020-10-23 | Electric tool control circuit and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022391967.0U CN213402520U (en) | 2020-10-23 | 2020-10-23 | Electric tool control circuit and electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213402520U true CN213402520U (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022391967.0U Active CN213402520U (en) | 2020-10-23 | 2020-10-23 | Electric tool control circuit and electric tool |
Country Status (1)
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|---|---|
| CN (1) | CN213402520U (en) |
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2020
- 2020-10-23 CN CN202022391967.0U patent/CN213402520U/en active Active
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