CN212258459U - Electric screwdriver and charging circuit thereof - Google Patents
Electric screwdriver and charging circuit thereof Download PDFInfo
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- CN212258459U CN212258459U CN202020796571.1U CN202020796571U CN212258459U CN 212258459 U CN212258459 U CN 212258459U CN 202020796571 U CN202020796571 U CN 202020796571U CN 212258459 U CN212258459 U CN 212258459U
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Abstract
The utility model relates to an electricity is criticized and charging circuit thereof. The electric batch charging circuit comprises a current input end, an energy storage battery, a change-over switch, a first charging circuit and a second charging circuit, wherein the first charging circuit and the second charging circuit are connected between the current input end and the energy storage battery and are switched by the change-over switch. When the electric screwdriver charging circuit works, the first charging circuit or the second charging circuit can be selected to charge the energy storage battery through the change-over switch, so that the electric screwdriver can be charged under two different environments to adapt to different charging environments.
Description
Technical Field
The utility model relates to an electric tool technical field especially relates to an electricity is criticized and charging circuit thereof.
Background
The electric screwdriver, also called an electric screwdriver or an electric screwdriver, is an electric tool for screwing and unscrewing screws, and is one of the necessary tools for most production enterprises.
In the conventional technology, the electric batch is usually connected with a power adapter so as to realize charging.
The inventor finds out in the process of realizing the conventional technology that: the traditional electric batch charging mode is single, and different charging environments cannot be adapted to.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an electric batch and a charging circuit thereof to solve the problem of single electric batch charging method in the conventional technology.
An electric batch charging circuit comprising:
a current input terminal for obtaining an input current;
the selector switch is provided with a first contact, a second contact and a third contact, the first contact is connected with the current input end, and one of the second contact and the third contact is conducted with the first contact;
a first charging circuit, one end of which is connected with the second contact;
one end of the second charging circuit is connected with the third contact, and the second charging circuit comprises a voltage reduction circuit and a voltage stabilizing circuit which are connected in series;
and the energy storage battery is connected with the other end of the first charging circuit and is connected with the other end of the second charging circuit.
In one embodiment, the first charging circuit includes a charging conductor.
In one embodiment, the voltage reduction circuit includes:
a buck chip having a first leg A1, a second leg A2, a third leg A3, a fourth leg A4, and a fifth leg A5, the second leg A2 being connected to the third contact;
a capacitor C1 connected between the third contact and ground GND;
a resistor R1, one end of the resistor R1 is connected with the third contact, and the other end of the resistor R1 is connected with the first pin A1;
a resistor R2, one end of the resistor R2 being connected to the other end of the resistor R1, the other end of the resistor R2 being connected to the ground GND;
a diode D1, the anode of the diode D1 being connected with the third contact;
a diode D2, a cathode of the diode D2 being connected to a cathode of the diode D1;
an inductor coil including an inductor L1 and an inductor L2 which are mutually inductive, wherein one end of the inductor L1 is connected to the third contact, the other end of the inductor L1 is connected to the anode of the diode D1 and to the fifth pin a5, one end of the inductor L2 is connected to the anode of the energy storage battery, and the other end of the inductor L2 is connected to the cathode of the energy storage battery;
the resistor R3 is connected between the third pin A3 and the other end of the inductor L1;
and the resistor R4 is connected between the fourth pin A4 and the ground line GND.
In one embodiment, the voltage stabilizing circuit comprises:
the diode D3 is connected between one end of the inductor L2 and the anode of the energy storage battery;
and one polar plate of the capacitor C2 is connected with the positive electrode of the energy storage battery, and the other end of the capacitor C2 is connected with the negative electrode of the energy storage battery.
In one embodiment, the switch further comprises a fourth contact for conducting with the first contact;
the electric batch charging circuit further comprises:
and the third charging circuit is connected between the fourth contact and the energy storage battery so as to supply power to the energy storage battery through the third charging circuit, and the third charging circuit comprises a boost conversion circuit.
In one embodiment, the fourth contact is used for acquiring direct current, and the fourth contact comprises a positive end and a negative end, and the negative end is connected with a ground GND and a negative electrode of the energy storage battery;
the boost converter circuit includes:
a boost chip having a sixth leg B1, a seventh leg B2, an eighth leg B3, a ninth leg B4 and a tenth leg B5, wherein the sixth leg B1 is connected to the positive terminal, the seventh leg B2 is connected to the eighth leg B3, and the tenth leg B5 is connected to the ground GND;
a diode D4, wherein the anode of the diode D4 is connected with the positive terminal;
a resistor R5, one end of the resistor R5 being connected to the cathode of the diode D4, and the other end of the resistor R5 being connected to the ground GND;
a capacitor C3 connected between the positive terminal and the negative terminal;
a capacitor C4 connected between the positive terminal and the negative terminal;
an inductor L3 connected between the sixth pin B1 and the seventh pin B2;
a diode D5, wherein the anode of the diode D5 is connected with the seventh pin B2, and the cathode of the diode D5 is connected with the anode of the energy storage battery;
a resistor R6, one end of the resistor R6 being connected to the cathode of the diode D5;
a resistor R7, one end of the resistor R7 being connected to the cathode of the diode D5;
a switch K1 connected between the ninth pin B4 and the other end of the resistor R6 and the other end of the resistor R7, so that the other end of the resistor R6 and the other end of the resistor R7 are alternatively connected to the ninth pin B4;
the resistor R8 is connected between the ground wire GND and the ninth pin B4;
a capacitor C5 connected between the cathode of the diode D5 and the ground GND;
a capacitor C6 connected between the cathode of the diode D5 and the ground GND;
a diode D6, wherein the anode of the diode D6 is connected with the cathode of the diode D5;
and a resistor R9, one end of the resistor R9 being connected to the cathode of the diode D6, and the other end of the resistor R9 being connected to the ground GND.
In one embodiment, the switch further comprises a fifth contact for conducting with the first contact;
the electric batch charging circuit further comprises:
and the voltage reduction rectifying circuit is connected between the fifth contact and the third contact.
In one embodiment, the step-down rectification circuit includes:
a step-down transformer having a primary coil and a secondary coil electromagnetically induced with the primary coil, the primary coil being connected with the fifth contact;
and the full-bridge rectifier is connected between the secondary coil and the third contact to obtain and rectify the alternating current output by the step-down transformer.
In one embodiment, the third contact includes a positive terminal and a negative terminal, and the full-bridge rectifier includes:
a diode D7, an anode of the diode D7 being connected to the negative terminal of the third contact, a cathode of the diode D7 being connected to one terminal of the secondary winding;
a diode D8, an anode of the diode D8 being connected to one end of the secondary coil, and a cathode of the diode D8 being connected to a positive end of the third contact;
a diode D9, wherein the anode of the diode D9 is connected to the negative terminal of the third contact, and the cathode of the diode D9 is connected to the other end of the secondary winding;
and a diode D10, wherein the anode of the diode D10 is connected to the other end of the secondary coil, and the cathode of the diode D10 is connected to the positive terminal of the third contact.
An electric screwdriver comprising a charging circuit as described in any of the above embodiments.
The electric screwdriver and the charging circuit thereof comprise a current input end, an energy storage battery, a change-over switch, a first charging circuit and a second charging circuit, wherein the first charging circuit and the second charging circuit are connected between the current input end and the energy storage battery and are switched by the change-over switch. When the electric screwdriver charging circuit works, the first charging circuit or the second charging circuit can be selected to charge the energy storage battery through the change-over switch, so that the electric screwdriver can be charged under two different environments to adapt to different charging environments.
Drawings
FIG. 1 is a schematic diagram of an exemplary electric batch charging circuit;
FIG. 2 is a circuit diagram of a second charging circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an electric batch charging circuit according to another embodiment of the present application;
FIG. 4 is a circuit diagram of a third charging circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an electric batch charging circuit according to another embodiment of the present application;
FIG. 6 is a circuit diagram of a buck rectified current according to an embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. an electric batch charging circuit;
110. a current input terminal;
120. a switch;
121. a first contact;
122. a second contact;
123. a third contact;
124. a fourth contact;
125. a fifth contact;
130. a first charging circuit;
140. a second charging circuit;
142. a voltage reduction circuit;
1422. a voltage reduction chip;
144. a voltage stabilizing circuit;
150. an energy storage battery;
160. a third charging circuit;
162. a boost converter circuit;
1622. a boost chip;
170. a voltage reduction rectification circuit;
172. a step-down transformer;
174. a full bridge rectifier.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
This application is criticized charging mode single to the electricity among the conventional art, can't adapt to the problem of the different charging environment, provides one kind and can adapt to multiple charging environment's electric batch charging circuit and use this electric batch charging circuit's electric batch. In embodiments of the present application, the connection between two electronic devices or two circuits is referred to as an electrical connection. The electrical connection here means a connection by wire or wireless, so that electric wave transmission can be realized between two electronic devices or circuits.
In one embodiment, as shown in fig. 1, the present application provides an electric batch charging circuit 10, which includes a current input terminal 110, a switch 120, a first charging circuit 130, a second charging circuit 140, and an energy storage battery 150.
Specifically, the current input terminal 110 is used for obtaining an input current. Generally, the current input terminal 110 may be a metal conductive sheet such as a plug, so as to be connected to an ac power source or a dc power source such as a commercial power source to obtain current.
The switch 120 has a first contact 121, a second contact 122 and a third contact 123. The first contact 121 of the switch 120 is connected to the current input terminal 110, the second contact 122 is connected to the first charging circuit 130, and the third contact 123 is connected to the second charging circuit 140. The second contact 122 and the third contact 123 are in conduction with the first contact 121 alternatively, that is, only one of the second contact 122 and the third contact 123 is in conduction with the first contact 121 at the same time.
The first charging circuit 130 is connected between the second contact 122 and the energy storage battery 150. That is, one end of the first charging circuit 130 is connected to the second contact 122, and the other end of the first charging circuit 130 is connected to the energy storage battery 150. In one specific embodiment, the first charging circuit 130 may be a charging wire. When the current input terminal 110 obtains an input current with a voltage value equal to the operating voltage of the energy storage battery 150, the energy storage battery 150 may be charged by the first charging circuit 130.
The second charging circuit 140 is connected between the third contact 123 and the energy storage battery 150. That is, one end of the second charging circuit 140 is connected to the third contact 123, and the other end of the second charging circuit 140 is connected to the energy storage battery 150. In the present embodiment, the second charging circuit 140 includes a voltage step-down circuit 142 and a voltage stabilizing circuit 144 connected in series. When the current input terminal 110 obtains an input current with a voltage value greater than the operating voltage of the energy storage battery 150, the second charging circuit 140 may step down and stabilize the input current, so as to charge the energy storage battery 150.
The energy storage battery 150 is used for storing electric energy, and may be a lithium battery pack, etc., and will not be described in detail.
More specifically, the operating voltage of the energy storage battery 150 of the present application is assumed to be 24V. When the external power source can output 24V dc power, the first contact 121 and the second contact 122 of the switch 120 can be turned on by manually controlling the switch 120, so as to directly charge the energy storage battery 150 through the first charging circuit 130. When the external power source can output dc power but the voltage is higher than 24V, such as when the external power source can output 48V dc power, the first contact 121 and the third contact 123 of the switch 120 can be turned on by manually controlling the switch 120, so as to charge the energy storage battery 150 through the second charging circuit 140. The second charging circuit 140 can step down and stabilize the 48V dc power to obtain 24V dc power for output to the energy storage battery 150.
The electric batch charging circuit 10 comprises a current input terminal 110, a storage battery 150, a switch 120, and a first charging circuit 130 and a second charging circuit 140 connected between the current input terminal 110 and the storage battery 150 and switched by the switch 120. When the electric batch charging circuit 10 works, the first charging circuit 130 or the second charging circuit 140 can be selected to charge the energy storage battery 150 through the switch 120, so that the electric batch can be charged under two different environments, and the electric batch charging circuit is suitable for different charging environments.
It should be understood that, in general, the energy storage cells 150 each include a positive electrode and a negative electrode, and thus, the first contact 121, the second contact 122, and the third contact 123 may also include a positive electrode terminal and a negative electrode terminal, respectively. These are common knowledge in the art, and although not shown in the drawings, they are also understood to be within the technical solutions of the present application and are not described again.
In one embodiment, as shown in fig. 2, the voltage dropping circuit 142 of the electric batch charging circuit 10 of the present application may include a voltage dropping chip 1422, a capacitor C1, a resistor R1, a resistor R2, a diode D1, a diode D2, and an inductor.
Specifically, the buck chip 1422 has a first leg a1, a second leg a2, a third leg A3, a fourth leg a4, and a fifth leg a 5. The second pin a2 of the buck chip 1422 is connected to the third contact 123.
The capacitor C1 is connected between the third contact 123 and the ground GND. In other words, one plate of the capacitor C1 is connected to the third contact 123, and the other plate of the capacitor C1 is connected to the ground GND.
The resistor R1 is connected between the third contact 123 and the first leg a 1. In other words, one end of the resistor R1 is connected to the third contact 123, and the other end of the resistor R1 is connected to the first pin a 1.
The resistor R2 is connected between the resistor R1 and the ground GND. In other words, one end of the resistor R2 is connected to the other end of the resistor R1, and the other end of the resistor R2 is connected to the ground GND. At this time, the resistor R2 is also connected between the first pin a1 and the ground GND.
Diode D1 may be a zener diode. The anode of the diode D1 is connected to the third contact 123.
The cathode of the diode D2 is connected to the cathode of the diode D1.
And the inductance coil comprises an inductance L1 and an inductance L2 which are mutually inductive, one end of the inductance L1 is connected with the third contact 123, and the other end of the inductance L1 is connected with the anode of the diode D1 and is connected to the fifth pin A5. One end of the inductor L2 is connected to the positive electrode of the energy storage battery 150, and the other end of the inductor L2 is connected to the negative electrode of the energy storage battery 150.
The resistor R3 is connected between the third pin A3 and the other end of the inductor L1. That is, one end of the resistor R3 is connected to the third pin A3, and the other end of the resistor R3 is connected to the other end of the inductor L1, that is, the anode of the diode D1.
The resistor R4 is connected between the fourth pin a4 and the ground GND.
Further, the stabilizing circuit 144 may include a diode D3 and a capacitor C2.
Specifically, the diode D3 is connected between one end of the inductor L2 and the positive electrode of the energy storage battery 150. Namely, the anode of the diode D3 is connected to one end of the inductor L2, and the cathode of the diode D3 is connected to the anode of the energy storage battery 150. Here, the diode D3 may also be a zener diode.
The capacitor C2 is connected between the positive and negative poles of the energy storage battery 150. That is, one plate of the capacitor C2 is connected to the positive electrode of the energy storage cell 150, and the other end of the capacitor C2 is connected to the negative electrode of the energy storage cell 150.
Further, in the embodiment of the present application, the buck chip 1422 may adopt a flyback buck converter chip with model number LT 3511. At this time, the first pin a1 may be pin No. 1 of the LT3511 flyback buck conversion chip; the second pin a2 may be TOP output pin TOP VIEW of LT3511 flyback buck converter chip; the third pin a3 may be pin 14 of LT3511 flyback buck conversion chip; the fourth pin a4 may be pin 12 of LT3511 flyback buck conversion chip; the fifth pin can be pin 16 of the LT3511 flyback buck conversion chip.
In one embodiment, as shown in fig. 3, the switch 120 further comprises a fourth contact 124 for conducting with the first contact 121. At this time, one of the second contact 122, the third contact 123, and the fourth contact 124 is electrically connected to the first contact 121.
In this embodiment, the electric batch charging circuit 10 of the present application further includes a third charging circuit 160. The third charging circuit 160 is connected between the fourth contact 124 and the energy storage battery 150. That is, one end of the third charging circuit 160 is connected to the fourth contact 124, and the other end of the third charging circuit 160 is connected to the energy storage battery 150, so as to charge the energy storage battery 150 through the third charging circuit 160. In the present embodiment, the third charging circuit 160 includes a boost converter circuit 162. When the current input terminal 110 obtains an input current with a voltage value smaller than the operating voltage of the energy storage battery 150, the third charging circuit 160 may boost the input current, so as to charge the energy storage battery 150.
More specifically, the operating voltage of the energy storage battery 150 of the present application is assumed to be 24V. When the external power source can output dc power but the voltage is lower than 24V, for example, when the external power source can output 5V or 12V dc power, the first contact 121 and the fourth contact 124 of the switch 120 can be turned on by manually controlling the switch 120, so as to charge the energy storage battery 150 through the third charging circuit 160. The third charging circuit 160 can boost the 5V or 12V dc power to obtain 24V dc power for output to the energy storage battery 150.
As is known from the above description, in general, the energy storage battery 150 includes a positive terminal and a negative terminal, and thus, the fourth contact 124 may also include a positive terminal and a negative terminal. In one embodiment, as shown in fig. 4, the fourth contact 124 includes a positive terminal and a negative terminal, and the negative terminal is connected to the ground GND and the negative terminal of the energy storage battery 150.
The third charging circuit 160 may include a boost converter circuit 162. The boost conversion circuit 162 comprises a boost chip 1622, a diode D4, a capacitor R5, a capacitor C3, a capacitor C4, an inductor L3, a diode D5, a resistor R6, a resistor R7, a switch K1, a resistor R8, a capacitor C5, a diode D6 and a resistor R9.
Specifically, the booster chip 1622 has a sixth leg B1, a seventh leg B2, an eighth leg B3, a ninth leg B4, and a tenth leg B5. The sixth pin B1 of the boost chip 1622 is connected to the positive terminal, the seventh pin B2 is connected to the eighth pin B3, and the tenth pin B5 is connected to the ground GND.
The diode D4 and the resistor R5 are connected in series between the positive terminal and ground. That is, the anode of the diode D4 is connected to the positive terminal, one end of the resistor R5 is connected to the cathode of the diode D4, and the other end of the resistor R5 is connected to the ground GND.
The capacitor C3 is connected between the positive terminal and the negative terminal. That is, one plate of the capacitor C3 is connected to the positive terminal, and the other plate of the capacitor C3 is connected to the negative terminal.
The capacitor C4 is connected between the positive terminal and the negative terminal. That is, one plate of the capacitor C4 is connected to the positive terminal, and the other plate of the capacitor C4 is connected to the negative terminal.
The inductor L3 is connected between the sixth leg B1 and the seventh leg B2. That is, one end of the inductor L3 is connected to the sixth pin B1, and the other end of the inductor L3 is connected to the seventh pin B2.
The anode of the diode D5 is connected to the seventh pin B2, and the cathode of the diode D5 is connected to the anode of the energy storage battery 150.
One end of the resistor R6 is connected to the cathode of the diode D5, and one end of the resistor R7 is connected to the cathode of the diode D5.
The switch K1 is connected between the ninth pin B4 and the other end of the resistor R6 and the other end of the resistor R7, so that the other end of the resistor R6 and the other end of the resistor R7 are alternatively connected to the ninth pin B4. In other words, by switching the switch 120K1, one of the resistor R6 or the resistor R7 and the ninth pin B4 of the boost chip 1622 can be turned on.
The resistor R8 is connected between the ground GND and the ninth pin B4. That is, one end of the resistor R8 is connected to the ground GND, and the other end of the resistor R8 is connected to the ninth pin B4.
The capacitor C5 is connected between the cathode of the diode D5 and the ground GND. That is, one plate of the capacitor C5 is connected to the cathode of the diode D5, and the other plate of the capacitor C5 is connected to the ground GND.
The capacitor C6 is connected between the cathode of the diode D5 and the ground GND. That is, one plate of the capacitor C6 is connected to the cathode of the diode D5, and the other plate of the capacitor C5 is connected to the ground GND.
Diode D6 is connected in series with resistor R9. The anode of the diode D6 is connected to the cathode of the diode D5, and the cathode of the diode D6 is connected to one end of the resistor R9.
One end of the resistor R9 is connected to the cathode of the diode D6, and the other end of the resistor R9 is connected to the ground GND.
Further, in the embodiment of the present application, the boost chip 1622 may adopt a boost dc power conversion chip of model XL 6008. The boost conversion circuit 162 using the boost chip 1622 can realize voltage conversion from 5V or 12V dc to 24V dc. When the voltage of the input current is 5V, the switch 120K1 is switched to turn on the resistor R6 and the ninth pin B4, so that the boost converter circuit 162 converts the 5V dc power to the 24V dc power. When the voltage of the input current is 12V, the switch 120K1 may be switched to turn on the resistor R7 and the ninth pin B4, so that the boost converter circuit 162 converts 12V dc to 24V dc.
In one embodiment, as shown in fig. 5, the switch 120 further comprises a fifth contact 125 for conducting with the first contact 121. At this time, one of the second contact 122, the third contact 123, the fourth contact 124, and the fifth contact 125 is electrically connected to the first contact 121.
In this embodiment, the electric batch charging circuit 10 of the present application further includes a step-down rectification circuit 170. The step-down rectifying circuit 170 is connected between the fifth contact point 125 and the third contact point 123. That is, one end of the step-down rectification circuit 170 is connected to the fifth charging circuit, and the other end of the step-down rectification circuit 170 is connected to the third contact 123, so as to charge the energy storage battery 150 through the step-down rectification circuit 170 and the second charging circuit 140. The buck rectifying circuit 170 is used to buck and rectify the ac power. In the present embodiment, the step-down rectification circuit 170 may step down and rectify the alternating current. When the current input terminal 110 is connected to the commercial power to obtain 220V ac, the 220V ac can be converted into 48V dc by the voltage-reducing rectification circuit 170, and the 48V dc is subjected to voltage reduction and stabilization by the second charging circuit 140 to obtain 24V dc for outputting to the energy storage battery 150.
As is known from the above description, the energy storage cell 150 generally comprises a positive pole and a negative pole, whereby the fifth contact 125 may also comprise a positive pole terminal and a negative pole terminal. In one embodiment, as shown in fig. 6, the buck rectifying circuit 170 of the electric batch charging circuit 10 of the present application includes a buck transformer 172 and a full bridge rectifier 174.
Specifically, the step-down transformer 172 has a primary coil and a secondary coil electromagnetically inductive with the primary coil, and the number of turns of the secondary coil is smaller than that of the primary coil as the step-down transformer 172. These are common general knowledge in the art and will not be described in further detail. In the present embodiment, the primary coil is connected to the fifth contact 125, so that the step-down transformer 172 can take 220V ac and convert the 220V ac into 48V ac.
The full bridge rectifier 174 is connected between the secondary coil and the third contact 123 to obtain and rectify the ac power output by the step-down transformer 172. In other words, the full bridge rectifier 174 is connected between the secondary coil and the third contact 123, so as to obtain the 48V ac power and convert it into the 48V dc power.
Further, in the present embodiment, the third contact 123 includes a positive terminal and a negative terminal. The full bridge rectifier 174 includes a diode D7, a diode D8, a diode D9, and a diode D10.
Specifically, the anode of the diode D7 is connected to the negative terminal of the third contact 123, and the cathode of the diode D7 is connected to one end of the secondary winding.
The anode of the diode D8 is connected to one end of the secondary coil, and the cathode of the diode D8 is connected to the positive end of the third contact 123.
The anode of the diode D9 is connected to the negative terminal of the third contact 123, and the cathode of the diode D9 is connected to the other end of the secondary winding.
The anode of the diode D10 is connected to the other end of the secondary coil, and the cathode of the diode D10 is connected to the positive terminal of the third contact 123. Thus, the full-bridge rectifier circuit composed of the diode D7, the diode D8, the diode D9 and the diode D10 can obtain the alternating current and output the direct current.
The electric screwdriver charging circuit 10 can obtain 220V alternating current, 48V direct current, 24V direct current, 12V direct current and 5V direct current, and charge the energy storage battery 150, so that the electric screwdriver can adapt to different charging environments, and the portability of the electric screwdriver is improved.
The present application further provides an electric screwdriver comprising the electric screwdriver charging circuit 10 as in any of the above embodiments.
Specifically, the electric batch charging circuit 10 includes: a current input terminal 110 for obtaining an input current; a switch 120 having a first contact 121, a second contact 122, and a third contact 123, the first contact 121 being connected to the current input terminal 110, the second contact 122 and the third contact 123 selecting one of them to be electrically connected to the first contact 121; a first charging circuit 130 having one end connected to the second contact 122; a second charging circuit 140, one end of which is connected to the third contact 123, the second charging circuit 140 including a voltage-reducing circuit 142 and a voltage-stabilizing circuit 144 connected in series; and the energy storage battery 150 is connected with the other end of the first charging circuit 130 and is connected with the other end of the second charging circuit 140.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An electric batch charging circuit, comprising:
a current input terminal for obtaining an input current;
the selector switch is provided with a first contact, a second contact and a third contact, the first contact is connected with the current input end, and one of the second contact and the third contact is conducted with the first contact;
a first charging circuit, one end of which is connected with the second contact;
one end of the second charging circuit is connected with the third contact, and the second charging circuit comprises a voltage reduction circuit and a voltage stabilizing circuit which are connected in series;
and the energy storage battery is connected with the other end of the first charging circuit and is connected with the other end of the second charging circuit.
2. The electric batch charging circuit of claim 1, wherein the first charging circuit comprises a charging wire.
3. The electric batch charging circuit of claim 1 wherein the voltage reduction circuit comprises:
a buck chip having a first leg A1, a second leg A2, a third leg A3, a fourth leg A4, and a fifth leg A5, the second leg A2 being connected to the third contact;
a capacitor C1 connected between the third contact and ground GND;
a resistor R1, one end of the resistor R1 is connected with the third contact, and the other end of the resistor R1 is connected with the first pin A1;
a resistor R2, one end of the resistor R2 being connected to the other end of the resistor R1, the other end of the resistor R2 being connected to the ground GND;
a diode D1, the anode of the diode D1 being connected with the third contact;
a diode D2, a cathode of the diode D2 being connected to a cathode of the diode D1;
an inductor coil including an inductor L1 and an inductor L2 which are mutually inductive, wherein one end of the inductor L1 is connected to the third contact, the other end of the inductor L1 is connected to the anode of the diode D1 and to the fifth pin a5, one end of the inductor L2 is connected to the anode of the energy storage battery, and the other end of the inductor L2 is connected to the cathode of the energy storage battery;
the resistor R3 is connected between the third pin A3 and the other end of the inductor L1;
and the resistor R4 is connected between the fourth pin A4 and the ground line GND.
4. The electric batch charging circuit of claim 3, wherein the voltage regulator circuit comprises:
the diode D3 is connected between one end of the inductor L2 and the anode of the energy storage battery;
and one polar plate of the capacitor C2 is connected with the positive electrode of the energy storage battery, and the other end of the capacitor C2 is connected with the negative electrode of the energy storage battery.
5. The electric batch charging circuit according to claim 1, wherein the diverter switch further comprises a fourth contact for conducting with the first contact;
the electric batch charging circuit further comprises:
and the third charging circuit is connected between the fourth contact and the energy storage battery so as to supply power to the energy storage battery through the third charging circuit, and the third charging circuit comprises a boost conversion circuit.
6. The electric batch charging circuit according to claim 5, wherein the fourth contact is used for obtaining direct current, the fourth contact comprises a positive terminal and a negative terminal, and the negative terminal is connected with a ground GND and a negative terminal of the energy storage battery;
the boost converter circuit includes:
a boost chip having a sixth leg B1, a seventh leg B2, an eighth leg B3, a ninth leg B4 and a tenth leg B5, wherein the sixth leg B1 is connected to the positive terminal, the seventh leg B2 is connected to the eighth leg B3, and the tenth leg B5 is connected to the ground GND;
a diode D4, wherein the anode of the diode D4 is connected with the positive terminal;
a resistor R5, one end of the resistor R5 being connected to the cathode of the diode D4, and the other end of the resistor R5 being connected to the ground GND;
a capacitor C3 connected between the positive terminal and the negative terminal;
a capacitor C4 connected between the positive terminal and the negative terminal;
an inductor L3 connected between the sixth pin B1 and the seventh pin B2;
a diode D5, wherein the anode of the diode D5 is connected with the seventh pin B2, and the cathode of the diode D5 is connected with the anode of the energy storage battery;
a resistor R6, one end of the resistor R6 being connected to the cathode of the diode D5;
a resistor R7, one end of the resistor R7 being connected to the cathode of the diode D5;
a switch K1 connected between the ninth pin B4 and the other end of the resistor R6 and the other end of the resistor R7, so that the other end of the resistor R6 and the other end of the resistor R7 are alternatively connected to the ninth pin B4;
the resistor R8 is connected between the ground wire GND and the ninth pin B4;
a capacitor C5 connected between the cathode of the diode D5 and the ground GND;
a capacitor C6 connected between the cathode of the diode D5 and the ground GND;
a diode D6, wherein the anode of the diode D6 is connected with the cathode of the diode D5;
and a resistor R9, one end of the resistor R9 being connected to the cathode of the diode D6, and the other end of the resistor R9 being connected to the ground GND.
7. The electric batch charging circuit according to claim 1, wherein the diverter switch further comprises a fifth contact for conducting with the first contact;
the electric batch charging circuit further comprises:
and the voltage reduction rectifying circuit is connected between the fifth contact and the third contact.
8. The electric batch charging circuit according to claim 7, wherein the buck rectifying circuit comprises:
a step-down transformer having a primary coil and a secondary coil electromagnetically induced with the primary coil, the primary coil being connected with the fifth contact;
and the full-bridge rectifier is connected between the secondary coil and the third contact to obtain and rectify the alternating current output by the step-down transformer.
9. The electric batch charging circuit according to claim 8, wherein the third contact comprises a positive terminal and a negative terminal, the full bridge rectifier comprising:
a diode D7, an anode of the diode D7 being connected to the negative terminal of the third contact, a cathode of the diode D7 being connected to one terminal of the secondary winding;
a diode D8, an anode of the diode D8 being connected to one end of the secondary coil, and a cathode of the diode D8 being connected to a positive end of the third contact;
a diode D9, wherein the anode of the diode D9 is connected to the negative terminal of the third contact, and the cathode of the diode D9 is connected to the other end of the secondary winding;
and a diode D10, wherein the anode of the diode D10 is connected to the other end of the secondary coil, and the cathode of the diode D10 is connected to the positive terminal of the third contact.
10. An electric batch characterized in that it comprises an electric batch charging circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020796571.1U CN212258459U (en) | 2020-05-12 | 2020-05-12 | Electric screwdriver and charging circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020796571.1U CN212258459U (en) | 2020-05-12 | 2020-05-12 | Electric screwdriver and charging circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN212258459U true CN212258459U (en) | 2020-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020796571.1U Active CN212258459U (en) | 2020-05-12 | 2020-05-12 | Electric screwdriver and charging circuit thereof |
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| Country | Link |
|---|---|
| CN (1) | CN212258459U (en) |
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2020
- 2020-05-12 CN CN202020796571.1U patent/CN212258459U/en active Active
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