CN105337319A - Electric tool and power supply circuit thereof - Google Patents
Electric tool and power supply circuit thereof Download PDFInfo
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- CN105337319A CN105337319A CN201410305343.9A CN201410305343A CN105337319A CN 105337319 A CN105337319 A CN 105337319A CN 201410305343 A CN201410305343 A CN 201410305343A CN 105337319 A CN105337319 A CN 105337319A
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Abstract
The invention discloses a power supply circuit. The power supply circuit comprises a battery core pack, an electric appliance and a control circuit, wherein the electric appliance is electrically connected with the battery core pack, and the control circuit comprises an MCU controller and a voltage acquisition circuit, wherein the voltage acquisition circuit can acquire core voltage of the battery core pack; the control circuit further comprises a first control switch, a compensation control switch, a first driving circuit and a compensation driving circuit, wherein the first control switch is connected in series with the electrical connection line of the electric appliance and the battery core pack, the compensation control switch is connected in parallel with the electrical appliance; the MCU controller transmits first control signals to the control end of the first control switch through the first driving circuit according to the ratio of the core voltage acquired by the voltage acquisition circuit to the rated voltage of the electric appliance; and the compensation driving circuit controls the compensation control switch and makes the same switched on at the interval of the transmission of the first control signals of the MCU controller. With the power supply circuit provided by the invention adopted, the battery pack with the core voltage different from the rated voltage can be converted into a battery pack which is suitable for the electric appliance.
Description
Technical field
The present invention relates to a kind of power tool, the electric tool that the output voltage being specifically related to a kind of power brick can be converted and power supply circuits thereof.
Background technology
Existing electric tool in use, a tool host only can use a kind of power brick with specific output voltage usually, such as, rated voltage when tool host works under nominal power is 18V, so this tool host can only use the power brick with 18V output voltage, and usually can not use the power brick with 56V, 36V output voltage.Like this, when a tool host with 18V rated voltage needs a power brick to power, and the restriction of condition of work is subject to, only there is the power brick of a 36V output voltage at one's side, at this moment, this power brick then can not be powered for this tool host, affects the continuation of work.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of electric tool and power supply circuits thereof, the power brick with the battery core voltage being different from rated voltage can be converted to the power brick of applicable electrical appliance by these power supply circuits.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
A kind of power supply circuits, comprising: battery core pack, electrical appliance and control circuit, wherein, battery core pack is made up of multiple battery core unit, and electrical appliance forms with battery core pack and is electrically connected; Control circuit comprises: MCU controller, voltage collection circuit, and voltage collection circuit is connected electrically between battery core pack and MCU controller at least partly, and it can gather the battery core voltage of battery core pack and feed back to MCU controller; Control circuit also comprises: the first control switch, compensatory control switch, first control switch, compensatory control switch include two switch terminals and a control end that can control two switch terminals and be communicated with or disconnect, and power supply circuits also comprise: the first drive circuit and the compensation drive circuit that drive the control end of the first control switch, compensatory control switch respectively; Circuit between two switch terminals of the first control switch is connected on electrical appliance and forms in the circuit be electrically connected with battery core pack, and the circuit between two switch terminals of compensatory control switch forms in parallel with electrical appliance; First drive circuit is electrically connected with the control end of MCU controller and the first control switch respectively, the ratio of the battery core voltage that MCU controller gathers according to voltage collection circuit and the rated voltage of electrical appliance sends the first control signal by the first drive circuit to the control end of the first control switch, compensation drive circuit is electrically connected to the control end of compensatory control switch, and compensation drive circuit sends the Separation control compensatory control switch conduction of the first control signal at MCU controller.
Further, MCU controller is electrically connected with compensation drive circuit, and MCU controller sends the second control signal by compensation drive circuit to the control end of compensatory control switch, and MCU controller sends the second control signal at the interval of transmission first control signal.
Further, at least comprise one with electrical appliance and the control capacitance that is connected in compensation drive circuit, one end that control capacitance is connected with electrical appliance negative pole to form with the control end of compensatory control switch as control signal input point and is electrically connected.
Further, control circuit also comprises: be connected on electrical appliance and form sampling resistor in the circuit be electrically connected with battery core pack, have the second control switch of two switch terminals and a control end and drive second drive circuit of control end of the second control switch; The high-pressure side of resistance is adopted to be electrically connected to MCU controller; Circuit between two switch terminals of the second control switch is connected on electrical appliance and forms in the circuit be electrically connected with battery core pack; MCU controller forms with the second drive circuit and is electrically connected, MCU controller controls the second control switch two switch terminals when adopting ohmically electric current to be less than preset value are communicated with, and two switch terminals controlling the second control switch when adopting ohmically electric current to be more than or equal to preset value turn off.
Further, the first control switch, the second control switch and compensatory control switch are switch mosfet.
Further, voltage collection circuit at least comprises: a sampling capacitance, and one end of sampling capacitance is connected with the positive pole of battery core pack, and this end adopts point to be electrically connected to MCU controller as voltage.
The present invention also proposes a kind of electric tool, it comprises: a tool host and at least one power brick, tool host comprises above-described electrical appliance, and power brick comprises: above-described battery core pack, and the battery core pack of different power brick has the battery core unit of different number; Power brick is when being mounted to tool host and powering for it, and the entirety that power brick and tool host are formed at least forms above-described power supply circuits.
Further, control circuit is arranged in tool host.
Further, control circuit is arranged in power brick.
Further, electrical appliance is motor.
Usefulness of the present invention is: power supply circuits of the present invention, the power brick with higher battery core voltage can be made can be used in the electrical appliance of low rated voltage, thus make a power brick can be applied at least two kinds of voltage platforms, add the versatility of power brick.On the other hand, the power brick with higher battery core voltage also has higher capacitance, therefore, the power brick with higher battery core voltage is used in the electrical appliance of low rated voltage, effectively can improve the operating time of electric tool, and user need not buy reserve battery bag in addition, significantly reduces job costs.
Accompanying drawing explanation
Figure 1 shows that the structural representation of electric tool of the present invention;
Figure 2 shows that the structural representation of the first embodiment of the power supply circuits in electric tool of the present invention;
Figure 3 shows that the structural representation of the voltage collection circuit in Fig. 2;
Figure 4 shows that the structural representation of the second embodiment of the power supply circuits in electric tool of the present invention;
Figure 5 shows that the structural representation of the compensation drive circuit in Fig. 4.
Embodiment
Below in conjunction with the drawings and specific embodiments, concrete introduction is done to the present invention.
The present invention proposes a kind of electric tool, and the power supply circuits that each assembly in electric tool is formed.
Figure 1 shows that the structural representation of electric tool of the present invention.Please refer to Fig. 1, in the present invention, for electric saw, certainly, the electric tool 100 of indication of the present invention, not as limit, can be various instrument common to those skilled in the art, such as hay mover, pruning machine, electric drill etc.In the present invention, this electric tool 100 comprises tool host 110 and power brick 120.
Figure 2 shows that the structural representation of the first embodiment of the power supply circuits in electric tool of the present invention, please with reference to Fig. 1 and Fig. 2: tool host 110 is as the main part of electric tool 100, it is except comprising the function accessories (figure does not mark) of implementation tool function, also comprise for function accessories provide the electrical appliance 111 of power, in the present embodiment, this electrical appliance 111 is preferably motor.
Power brick 120 provides energy for giving tool host 110, and it comprises battery core pack 121, in the present embodiment, in order to expand the capacity of power brick 120 as far as possible, battery core pack 121 is made up of multiple battery core unit (figure does not mark).In addition, we know that the battery core pack 121 of different power brick 120 has the battery core unit of different number usually, thus form the power brick 120 with different battery core voltage.In the present embodiment, battery core pack 121 forms with electrical appliance 111 and is electrically connected, comprise positive output end b+ and negative output terminal b-, thus electric tool 100 powers to the electrical appliance 111 in tool host 110 by the battery core pack 121 in power brick 120 when working, and form power supply circuits in electric tool 100.
In the present embodiment, power supply circuits are used for the electric energy in battery core pack 121 to be supplied to electrical appliance 111, it is except comprising battery core pack 121 and electrical appliance 111, also comprise the control circuit that can control the electrical connection between battery core pack 121 and electrical appliance 111, this control circuit can be arranged in tool host 110, also can be arranged in power brick 120, can arrange according to actual needs.
In the present invention, this control circuit comprises voltage collection circuit 131, first control switch Q1, compensatory control switch Q2, the first drive circuit 132, compensation drive circuit 133, MCU controller 134, sampling resistor R1, the second control switch Q3 and the second drive circuit 135.
Voltage collection circuit 131 is for gathering the battery core voltage of battery core pack 121.Voltage collection circuit 131 is connected with battery core pack 121 and MCU controller 134 respectively, voltage collection circuit 131 is connected electrically between battery core pack 121 and MCU controller 134, thus can is MCU controller 134 by the battery core Voltage Feedback of the battery core pack 121 collected.
First control switch Q1 comprises two switch terminals P1, P2 and a control end P3.The circuit between two switch terminals P1, P2 in first control switch Q1 is connected on electrical appliance 111 and battery core pack 121 forms in the circuit of electrical connection, more specifically, one of them switch terminals P1 is connected to the negative output terminal b-of battery core pack 121, and another switch terminals P2 is electrically connected to the low-pressure end of sampling resistor R1; The control end P3 of the first control switch Q1 can control the connection between two switch terminals P1, P2 or the disconnection of the first control switch Q1 by the signal received.
Compensatory control switch Q2 also comprises two switch terminals P4, P5 and a control end P6.The circuit between two switch terminals P4, P5 of compensatory control switch Q2 forms in parallel with electrical appliance 111, more specifically, one of them switch terminals P5 is connected to the positive input terminal m+ of electrical appliance 111, and another switch terminals P4 is electrically connected to the negative input end m-of electrical appliance 111.The control end P6 of compensatory control switch Q2 also can the connection between two switch terminals P4, P5 of control and compensation control switch Q2 or disconnection by the signal that receives.In the present embodiment, the first control switch Q1 and compensatory control switch Q2 is switch mosfet.
First drive circuit 132 and compensation drive circuit 133 are respectively used to the opening and closing of driving first control switch Q1, compensatory control switch Q2.Wherein, the first drive circuit 132 is connected with the control end P3 of the first control switch Q1 and MCU controller 134 respectively, thus the control signal received can be sent to the control end P3 of the first control switch Q1; Compensation drive circuit 133 is connected with the control end P6 of compensatory control switch Q2 and MCU controller 134 respectively, thus the control signal received can be sent to the control end P6 of compensatory control switch Q2.
MCU controller 134 is electrically connected with the first drive circuit 132 and compensation drive circuit 133 respectively, and sends control signal by the first drive circuit 132 and compensation drive circuit 133 to the first control switch Q1 and compensatory control switch Q2.Concrete, MCU controller 134 sends the first control signal by the first drive circuit 132 to the control end P3 of the first control switch Q1, it is that the battery core voltage of battery core pack 121 gathered according to voltage collection circuit 131 sends the first control signal with the ratio of the rated voltage of electrical appliance 111, and, send in the interval of the first control signal at MCU controller 134, MCU controller 134 also sends the second control signal by compensation drive circuit 133 to the control end P6 of compensatory control switch Q2, and under the effect of the second control signal, make compensatory control switch Q2 in the interval that MCU controller 134 sends the first control signal be in conducting state.Such as, when in power brick 120, the battery core voltage of battery core pack 121 is 36V, and the rated voltage of electrical appliance 111 is 18V, like this in order to this power brick 120 can normally be powered for this electrical appliance 111, before in one-period in half period, MCU controller 134 sends the first control signal by the first drive circuit 132 to the control end P3 of the first control switch Q1, now do not send any control signal to compensatory control switch Q2, and when rear half period, MCU controller 134 stops transmission first control signal, and now send the second control signal by compensation drive circuit 133 to compensatory control switch Q2.
Sampling resistor R1 is connected on electrical appliance 111 and forms in the circuit be electrically connected with battery core pack 121.One end of sampling resistor R1 is connected on a switch terminals P2 of the first control switch Q1, the other end is connected with the second control switch Q3, and the high-pressure side of sampling resistor R1 is also electrically connected with MCU controller 134, that is to say that one end that sampling resistor R1 is connected with the second control switch Q3 is electrically connected with MCU controller 134.
Second control switch Q3 also comprises two switch terminals P7, P8 and a control end P9.The circuit between two switch terminals P7, P8 of the second control switch Q3 is connected on electrical appliance 111 and forms in the circuit be electrically connected with battery core pack 121, that is to say that one of them switch terminals P8 is connected to the negative output terminal b-of electrical appliance 111, another switch terminals P7 is electrically connected with the high-pressure side of sampling resistor R1; The control end P9 of the second control switch Q3 can control the connection between two switch terminals P7, P8 or the disconnection of the second control switch Q3 by the signal received.In the present embodiment, the second control switch Q3 is also switch mosfet.
Second drive circuit 135 is for driving the opening and closing of the second control switch Q3, and it is electrically connected with the control end P9 of the second control switch Q3 and MCU controller 134 respectively.When flowing through the electric current on sampling resistor R1 and being less than a preset value, MCU controller 134 can send the 3rd control signal by the second drive circuit 135 to the control end P9 of the second control switch Q3 and two switch terminals P7, the P8 of the second control switch Q3 are communicated with, and when flowing through the electric current on sampling resistor R1 and being greater than this preset value, two switch terminals P7, P8 that MCU controller 134 controls the second control switch Q3 disconnect.Here, this preset value corresponds to the rated power of electrical appliance 111, can be rated current; therefore, when the electric current flowing through sampling resistor R1 is greater than rated current, disconnect the second control switch Q3 by MCU controller 134; thus cut-out power supply circuits, protection electric tool 100.
Figure 3 shows that the structural representation of the voltage collection circuit in Fig. 2.Please refer to Fig. 3, voltage collection circuit 131 comprises sampling capacitance C1 and voltage sample resistance R2, one end of sampling capacitance C1 is connected with the positive output end b+ of battery core pack 121, this positive output end b+ is the positive pole of battery core pack 121, and this end that sampling capacitance C1 is connected with the positive pole of battery core pack 121 also adopts as voltage and is a little electrically connected on MCU controller 134, in addition, one end ground connection be not connected with sampling capacitance C1 of voltage sample resistance R2, thus MCU controller 134 can collect the battery core voltage of battery core pack 121 by sampling capacitance C1 and voltage sample resistance R2.
Figure 4 shows that the structural representation of the second embodiment of the power supply circuits in electric tool of the present invention, Figure 5 shows that the structural representation of the compensation drive circuit in Fig. 4.Please refer to Fig. 4 and Fig. 5, only introduce the difference part in the present embodiment and the first embodiment below, repeat no more as same section.In the present embodiment, compensation drive circuit 133 also can not carry out the opening and closing of control and compensation control switch by MCU controller 134, concrete, compensation drive circuit 133 comprises a control capacitance C2, this control capacitance C2 and electrical appliance 111 also connect, one end of control capacitance C2 is connected with the positive input terminal m+ of electrical appliance 111, the other end is connected with the negative input end m-of electrical appliance 111, and one end of being connected with electrical appliance 111 negative input end m-of control capacitance C2 also to form with the control end P6 of compensatory control switch Q2 as control signal input point and is electrically connected, like this, when the first control switch Q1 disconnects, now because the electric current flowing through electrical appliance 111 can not be undergone mutation, therefore the electric current flowing through electrical appliance 111 will to control capacitance C2 charging, compensatory control switch Q2 can be triggered by the control capacitance C2 charged to open, thus control capacitance C2 is by the compensatory control switch Q2 short circuit of having opened, finally between electrical appliance 111 and control capacitance C2, form current circuit, the normal operating conditions of electrical appliance 111 can be maintained.
Below introduce the whole course of work and the principle of power supply circuits of the present invention: here with the rated voltage of electrical appliance 111 for 18V, and the battery core voltage of power brick 120 of access is 36V, and compensation drive circuit 133 is controlled as example by MCU controller 134.In one-period, first, the battery core voltage of power brick 120 is gathered by voltage collection circuit 131, the ratio of the battery core voltage 36V that MCU controller 134 gathers according to the rated voltage 18V of electrical appliance 111 and voltage collection circuit 131 is the duty ratio of 0.5 adjustment first control switch Q1 and compensatory control switch Q2 is 0.5, that is to say, within front 0.5 cycle, MCU controller 134 sends the first control signal by the first drive circuit 132 to the first control switch Q1, and within rear 0.5 cycle, MCU controller 134 sends the second control signal to compensatory control switch Q2, more specifically, namely be within front 0.5 cycle, the high level during signal that the control end P3 of the first control switch Q1 receives, and the signal that now the control end P6 of compensatory control switch Q2 receives is low level, thus two switch terminals P1 of the first control switch Q1, P2 is communicated with, two switch terminals P4 of compensatory control switch Q2, P5 disconnects, first control switch Q1 opens, compensatory control switch Q2 disconnects, electrical appliance 111 can normally work, then, current 0.5 cycle is when meeting duration, the signal that the control end P3 of the first control switch Q1 receives is low level, first control switch Q1 disconnects, 36v power brick 120 quits work, and because the inductance effect of electric current, thus the electric current flowing through electrical appliance 111 can not be undergone mutation, and the signal that meanwhile compensatory control switch Q2 receives is high level, compensatory control switch Q2 opens, thus the electric current that can not suddenly change flowed through on electrical appliance 111 will flow through compensatory control switch Q2, form current circuit, thus electrical appliance 111 still can work, thus electrical appliance 111 can be made to show in the whole work period be similar to the situation of being powered by 18V power brick 120.
To sum up, in power supply circuits of the present invention, the power brick with higher battery core voltage can be made can be used in the electrical appliance of low rated voltage, thus to make a power brick can be applied at least two kinds of voltage platforms, add the versatility of power brick.On the other hand, the power brick with higher battery core voltage also has higher capacitance, therefore, the power brick with higher battery core voltage is used in the electrical appliance of low rated voltage, effectively can improve the operating time of electric tool, and user need not buy reserve battery bag in addition, significantly reduces job costs
More than show and describe general principle of the present invention, principal character and advantage.The technical staff of the industry should understand, and above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (10)
1. power supply circuits, comprising: battery core pack, electrical appliance and control circuit, and wherein, described battery core pack is made up of multiple battery core unit, and described electrical appliance forms with described battery core pack and is electrically connected; Described control circuit comprises: MCU controller, voltage collection circuit, and described voltage collection circuit is connected electrically between described battery core pack and described MCU controller at least partly, and it can gather the battery core voltage of described battery core pack and feed back to described MCU controller; It is characterized in that, described control circuit also comprises: the first control switch, compensatory control switch, described first control switch, compensatory control switch include two switch terminals and a control end that can control two described switch terminals and be communicated with or disconnect, and described power supply circuits also comprise: the first drive circuit and the compensation drive circuit that drive the control end of described first control switch, compensatory control switch respectively; Circuit between two switch terminals of described first control switch is connected on described electrical appliance and forms in the circuit be electrically connected with described battery core pack, and the circuit between two switch terminals of described compensatory control switch forms in parallel with described electrical appliance; Described first drive circuit is electrically connected with the control end of described MCU controller and described first control switch respectively, the ratio of the described battery core voltage that described MCU controller gathers according to described voltage collection circuit and the rated voltage of described electrical appliance sends the first control signal by described first drive circuit to the control end of described first control switch, described compensation drive circuit is electrically connected to the control end of described compensatory control switch, and described compensation drive circuit sends compensatory control switch conduction described in the Separation control of described first control signal at described MCU controller.
2. power supply circuits according to claim 1, it is characterized in that, described MCU controller is electrically connected with described compensation drive circuit, described MCU controller sends the second control signal by described compensation drive circuit to the control end of described compensatory control switch, and the interval that described MCU controller is sending described first control signal sends described second control signal.
3. power supply circuits according to claim 1, it is characterized in that, at least comprise one in described compensation drive circuit with described electrical appliance and the control capacitance that is connected, one end that described control capacitance is connected with described electrical appliance negative pole to form with the control end of described compensatory control switch as control signal input point and is electrically connected.
4. the power supply circuits according to claims 1 to 3 any one, it is characterized in that, described control circuit also comprises: be connected on described electrical appliance and form sampling resistor in the circuit be electrically connected with described battery core pack, have the second control switch of two switch terminals and a control end and drive second drive circuit of control end of described second control switch; The high-pressure side of described employing resistance is electrically connected to described MCU controller; Circuit between two switch terminals of described second control switch is connected on described electrical appliance and forms in the circuit be electrically connected with described battery core pack; Described MCU controller forms with described second drive circuit and is electrically connected, MCU controller controls described second control switch two switch terminals when the ohmically electric current of described employing is less than preset value are communicated with, and two switch terminals controlling described second control switch when the ohmically electric current of described employing is more than or equal to described preset value turn off.
5. power supply circuits according to claim 4, is characterized in that, described first control switch, the second control switch and compensatory control switch are switch mosfet.
6. the power supply circuits according to claims 1 to 3 any one, it is characterized in that, described voltage collection circuit at least comprises: a sampling capacitance, and one end of described sampling capacitance is connected with the positive pole of described battery core pack, and this end adopts point to be electrically connected to described MCU controller as voltage.
7. an electric tool, comprise: a tool host and at least one power brick, it is characterized in that, described tool host comprises the electrical appliance in claim 1 to 6 described in any one, described power brick comprises: the battery core pack in claim 1 to 6 described in any one, and the battery core pack of different described power brick has the battery core unit of different number; Described power brick is when being mounted to described tool host and powering for it, and the entirety that described power brick and described tool host are formed at least forms the power supply circuits described in claim 1 to 6 any one.
8. electric tool according to claim 7, is characterized in that, described control circuit is arranged in described tool host.
9. electric tool according to claim 7, is characterized in that, described control circuit is arranged in described power brick.
10. the electric tool according to claim 7 to 9 any one, is characterized in that, described electrical appliance is motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410305343.9A CN105337319B (en) | 2014-06-30 | 2014-06-30 | Electric tool and its power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410305343.9A CN105337319B (en) | 2014-06-30 | 2014-06-30 | Electric tool and its power supply circuit |
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| Publication Number | Publication Date |
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| CN105337319A true CN105337319A (en) | 2016-02-17 |
| CN105337319B CN105337319B (en) | 2018-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410305343.9A Active CN105337319B (en) | 2014-06-30 | 2014-06-30 | Electric tool and its power supply circuit |
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| CN (1) | CN105337319B (en) |
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| CN112383036A (en) * | 2020-11-25 | 2021-02-19 | 云南电网有限责任公司文山供电局 | Active alternating current fleeing-in protection device of direct current ring network system and working method thereof |
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| Publication number | Publication date |
|---|---|
| CN105337319B (en) | 2018-02-23 |
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