CN103856048B - For the DC/DC converters of electric tool - Google Patents
For the DC/DC converters of electric tool Download PDFInfo
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- CN103856048B CN103856048B CN201210506740.3A CN201210506740A CN103856048B CN 103856048 B CN103856048 B CN 103856048B CN 201210506740 A CN201210506740 A CN 201210506740A CN 103856048 B CN103856048 B CN 103856048B
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Abstract
The present invention provides a kind of DC/DC converters for electric tool.The DC/DC converters control the break-make of device for power switching, and the conversion for coordinating to realize voltage with inductance, electric capacity and diode by a square wave generation circuit.Simultaneously, the element that the device for power switching of the DC/DC converters, inductance, electric capacity and diode adopt pressure voltage larger with resistance to flow valuve, so that the DC/DC converters can bear larger voltage and electric current, therefore the DC/DC converters have the advantages that load capacity is strong.
Description
Technical field
The present invention relates to a kind of Switching Power Supply, more particularly to a kind of DC/DC converters for electric tool.
Background technology
Electric tool operationally generally requires lasting electric energy supply.Some electric tools are using the electricity equipped with battery
The operating of pond Bao Laiwei electric tools provides energy.Lead-acid battery or lithium battery are generally equipped with conventional battery bag.Battery
Wrap or electric tool on can also be provided with DC/DC converters, by the voltage conversion of lead-acid battery or lithium battery into electronic
Voltage required for instrument.
However, conventional DC/DC converter load capacities are weaker, it is impossible to meet the fortune of the larger electric tool of operating current
Turn to need.
The content of the invention
Based on this, it is necessary to provide a kind of DC/DC converters for electric tool, which has strong excellent of load capacity
Point.
A kind of DC/DC converters for electric tool, including DC/DC modules, it is characterised in that the DC/DC modules
Including square wave generation circuit, device for power switching, inductance, diode and at least one output capacitor, the square wave produces electricity
Road controls the conducting of the device for power switching and disconnects, one end phase of one end of the device for power switching and the inductance
Even, the other end of the device for power switching forms a voltage input end of the DC/DC modules, the negative pole of the diode
End is connected with the inductance and the device for power switching, and the other end of the inductance is formed respectively with the positive pole of the diode
The negative voltage output end of the positive voltage output end of the DC/DC modules and the DC/DC modules, the negative voltage output head grounding,
The two ends of at least one output capacitor are connected with the positive terminal of the other end and the diode of the inductance respectively；Institute
The resistance to flow valuve of device for power switching, inductance, diode and at least one output capacitor is stated more than 10 amperes, pressure voltage is equal
In more than 55V.
Wherein in one embodiment, the square wave generation circuit includes the chip of model LM2576HVT-ADJ,
The VIN ends of the chip of model LM2576HVT-ADJ are connected with the voltage input end of the DC/DC modules, the model
OUTPUT ends for the chip of LM2576HVT-ADJ are connected with the control end of the device for power switching.
Wherein in one embodiment, the device for power switching is mos field effect transistor.
Wherein in one embodiment, the DC/DC converters also include processing module and output voltage control module, institute
State processing module to be connected with the output voltage control module, the output voltage control module is connected with the DC/DC modules,
The processing module controls the output voltage of the DC/DC modules by the output voltage control module.
Wherein in one embodiment, the DC/DC converters also include tool detection module, the tool detection module
It is connected with the processing module, the processing module controls the DC/DC according to the signal that the tool detection module is detected
The output voltage of module.
Wherein in one embodiment, the tool detection module includes switch and tool detection module capacitance, described to open
One end of pass is connected with the negative voltage output end of the DC/DC converters, the other end of the switch and the processing module phase
Even, one end of the tool detection module capacitance is connected with the switch and the processing module, the tool detection module electricity
The other end of appearance is connected with the ground of the input of the DC/DC converters.
Wherein in one embodiment, the DC/DC converters also include the temperature of the detection device for power switching
Temperature detecting module, the temperature detecting module are connected with the processing module.
Wherein in one embodiment, the DC/DC converters also include current detection module, the DC/DC converters
Input ground and negative voltage output end between be connected with a resistance, the current detection module and the processing module phase
The negative voltage output end of DC/DC converters described in Lian Bingyu is connected, and the current detection module is used to detect the DC/DC conversions
The electric current of the output end of device.
Wherein in one embodiment, the DC/DC converters also include battery voltage sensing module, the cell voltage
Detection module is connected with the processing module, and the battery voltage sensing module is used for the input for detecting the DC/DC converters
The voltage of the battery at end.
Wherein in one embodiment, the processing module is single-chip microcomputer.
The above-mentioned DC/DC converters for electric tool control device for power switching by a square wave generation circuit
Break-make, and the conversion for coordinating to realize voltage with inductance, electric capacity and diode, while the power switch device of the DC/DC converters
The element that part, inductance, electric capacity and diode adopt pressure voltage larger with resistance to flow valuve, so that the DC/DC converters can hold
By larger voltage and electric current, therefore have the advantages that load capacity is strong.
Description of the drawings
High-level schematic functional block diagrams of the Fig. 1 for the DC/DC converters of one embodiment；
Circuits of the Fig. 2 for the DC/DC modules, self-locking module and output voltage control module of DC/DC converters shown in Fig. 1
Figure；
Circuit diagrams of the Fig. 3 for the tool detection module and processing module of DC/DC converters shown in Fig. 1；
Circuit diagrams of the Fig. 4 for the temperature detecting module of DC/DC converters shown in Fig. 1；
Circuit diagrams of the Fig. 5 for the current detection module of DC/DC converters shown in Fig. 1；
Fig. 6 is the circuit diagram of the battery voltage sensing module of DC/DC converters shown in Fig. 1 and 5V modules；
Circuit diagrams of the Fig. 7 for the tool switch detection module of DC/DC converters shown in Fig. 1；
Fig. 8 is the internal circuit diagram of an electric tool；
Circuit diagrams of the Fig. 9 for the protection module of DC/DC converters shown in Fig. 1.
Specific embodiment
Fig. 1 and Fig. 2 is refer to, one embodiment provides a kind of DC/DC converters 100 for electric tool.The DC/DC
Converter 100 includes DC/DC modules 110, and the DC/DC modules 110 include square wave generation circuit 111, device for power switching, electricity
Sense, diode and at least one output capacitor.
Device for power switching herein be mos field effect transistor, its have higher pressure voltage with
Resistance to flow valuve, is the 4th mos field effect transistor Q4 as shown in Figure 2, and inductance is first as shown in Figure 2
Inductance L1, diode are the 5th diode D5 as shown in Figure 2, and the quantity of at least one output capacitor is four, respectively
3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 9th electric capacity C9.
The square wave generation circuit 111 controls device for power switching (i.e. the 4th mos field effect transistor
Q4 conducting) and disconnection, therefore the grid of the square wave generation circuit 111 and the 4th mos field effect transistor Q4
Extremely it is connected.One end phase of the one end (draining) of 4th mos field effect transistor Q4 with the first inductance L1
Even, the other end (i.e. source electrode) forms a voltage input end of the DC/DC modules 110.The negative pole end of the 5th diode D5 and
The drain electrode of one inductance L1 and the 4th mos field effect transistor Q4 is connected.The other end of the first inductance L1 and
The positive pole of five diode D5 forms the positive voltage output end of the DC/DC modules 111 and the negative voltage of the DC/DC modules 111 respectively
Output end, the negative voltage output head grounding.The multiple output capacitors other end and the five or two pole respectively with the first inductance L1
The positive terminal of pipe D5 is connected, i.e., the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 it is parallel with one another with the 9th electric capacity C9 after be connected
In two voltage output ends of the DC/DC modules 111.
4th mos field effect transistor Q4 used herein, the first inductance L1, the 5th diode
D5, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 9th electric capacity C9 resistance to flow valuve more than 10 amperes, pressure voltage
In more than 55V.It is plumbic acid electricity that the input of the DC/DC converters 100 is the battery that the DC/DC converters 100 provide power supply
Pond, in other embodiments, the battery of input can also be lithium battery.
The DC/DC converters 100 control the 4th metal oxide semiconductcor field effect by a square wave generation circuit 111
Answer the break-make of transistor Q4, and with the first inductance L1, the 5th diode D5, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5
The conversion for coordinating to realize voltage with the 9th electric capacity C9, so as to the output voltage required for input voltage is converted into.Meanwhile, should
4th mos field effect transistor Q4 of DC/DC converters 100, the first inductance L1, the 5th diode D5,
Three electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 9th electric capacity C9 using the element that pressure voltage is larger with resistance to flow valuve, make this
DC/DC converters 100 can bear larger voltage and electric current such that it is able to drive larger load.Therefore the DC/DC converters
100 have the advantages that load capacity is strong.
Fig. 2 is refer to, the square wave generation circuit 111 of the DC/DC modules 110 includes model LM2576HVT-ADJ
Chip U1.The VIN ends of the chip U1 of model LM2576HVT-ADJ and the voltage input end phase of the DC/DC modules 110
Even, the OUTPUT ends of the chip U1 of model LM2576HVT-ADJ and the 4th mos field effect transistor
The control end (i.e. grid) of Q4 is connected.The OUTPUT ends of the chip U1 of model LM2576HVT-ADJ in Fig. 2 and the 4th metal
Multiple resistance, diode, triode etc. are also associated between the control end of oxide semiconductor field effect transistor Q4 and form tool
Body realizes circuit, makes 100 reliable operation of DC/DC converters.
Fig. 1 is refer to, the DC/DC converters 100 also include processing module 120, output voltage control module 130, instrument
Detection module 140, temperature detecting module 150, current detection module 160, the detection of battery voltage sensing module 170, tool switch
Module 181, protection module 182,5V modules 183 and self-locking module 184.The processing module 120 of the DC/DC converters 100 is single
Piece machine U3, its physical interface figure refer to Fig. 3.
Wherein, the processing module 120 of the DC/DC converters 100 is connected with output voltage control module 130, output voltage
Control module 130 is connected with DC/DC modules 110.The processing module 120 controls DC/DC moulds by output voltage control module 130
The output voltage of block 110.Output voltage required for thus obtaining.The physical circuit of output voltage control module 130 can
To refer to Fig. 2.
The tool detection module 140 of the DC/DC converters 100 is connected with processing module 120.Processing module 120 is according to work
The output voltage of the signal control DC/DC modules 110 that tool detection module 140 is detected.Tool detection module 140 herein can be with
According to the interface detection different type electric tool on electric tool, then select defeated with the voltage that this electric tool matches
Go out and give this electric tool.
Fig. 3 is refer to, the tool detection module 140 includes a switch and a tool detection module capacitance, divides in figure
Wei not first switch S1 and the 21st electric capacity C21.One end of first switch S1 is defeated with the negative voltage of the DC/DC converters 100
Go out end to be connected, the other end of first switch S1 is connected with processing module 120, i.e., be connected (in figure with the 3rd pin of single-chip microcomputer U3
Two BAT_S ends represent that both are to be electrically connected with, also to indicate them be mutually electrically to connect to the similar sign of other in figure
Connect).One end of 21st electric capacity C21 is connected with first switch S1 and processing module 120, and the 21st electric capacity C21's is another
One end is connected with the ground of the input of the DC/DC converters 100.The power input of electric tool and the DC/DC converters 100
Output end be connected when, the interface of the power input of different electric tools can make first switch S1 of the DC/DC converters 100
With disconnecting and connecting two states, processing module 120 just can be exported not according to the two states control DC/DC modules 110
Same voltage, to match the input voltage of electric tool.
The temperature detecting module 150 of the DC/DC converters 100 can detect that (i.e. the 4th metal is aoxidized device for power switching
Thing semiconductor field effect transistor Q4) temperature.(i.e. the 7 of single-chip microcomputer U1 of the temperature detecting module 150 and processing module 120
Pin) it is connected.Physical circuit refer to Fig. 4.Temperature detecting module 150 can be partly led including the 4th metal oxide of measurement
The temperature detecting resistance of body field-effect transistor Q4 surface temperatures, so as to temperature signal is converted into electric signal to facilitate process.Process
The temperature on the 4th mos field effect transistor Q4 that module 120 is detected according to temperature detecting module 150
Adjustment flows through the electric current at the 4th mos field effect transistor Q4 two ends, so as to adjust the 4th metal oxide half
Temperature on conductor field-effect transistor Q4.
A resistance is connected between the ground and negative voltage output end of the input of the DC/DC converters 100.Current detecting
Module 160 is connected with the negative voltage output end of processing module 120 and the DC/DC converters 100, for detecting that the DC/DC is changed
The electric current of the output end of device 100.The electric current that processing module 120 is detected according to current detection module 160 control the DC/DC turn
The work of parallel operation 100.Physical circuit refer to Fig. 5.
The battery voltage sensing module 170 of the DC/DC converters 100 is connected with processing module 120, the battery voltage detection
Module 170 is used for the voltage of the battery of the input for detecting the DC/DC converters 100.When the voltage of the battery of input occurs
When exception, e.g., less than setting value, processing module 120 can make the DC/DC converters 100 quit work, to prevent battery excessive
Using the injury for making battery pair.Physical circuit refer to Fig. 6.
The tool switch detection module 181 of the DC/DC converters 100.The tool switch detection module 181 and processing module
Whether 120 are connected with electric tool, for judging electric tool in work.Physical circuit may be referred to Fig. 7 and Fig. 8.Fig. 8 is normal
The internal wiring schematic diagram of electric tool.
The protection module 182 of the DC/DC converters 100 is connected with processing module 120 and electric tool, electronic for detecting
Voltage on instrument.When the voltage that protection module 182 is detected on electric tool occurs abnormal, processing module 120 can be controlled
The DC/DC converters 100 quit work, and ensure safety with protection circuit and the purpose of instrument to reach.
The 5V modules 183 of the DC/DC converters 100 are connected with processing module 120.The 5V modules 183 can be by battery electricity
Pressure is converted into 5V voltages and provides power supply for the work of processing module 120.
The self-locking module 184 of the DC/DC converters 100 is connected with DC/DC modules 110 and processing module 120.As the DC/
When the electric tool connected by DC converters 100 quits work, processing module 120 can control self-locking module 184 and make DC/DC modules
110 quit work, so as to reduce quiescent dissipation.When electric tool needs to rework, processing module 120 can control self-locking mode
Block 184 makes DC/DC modules 110 rework, so as to for electric tool out-put supply.
The DC/DC converters 100 by DC/DC modules 110 by the cell voltage of input be converted into output voltage so as to
Needed for the electric energy of the electric tool that satisfaction is connected to output end.Also, the 4th metal oxide of the DC/DC converters 100 half
Conductor field-effect transistor Q4, the first inductance L1, the 5th diode D5, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 with
9th electric capacity C9 using the pressure voltage element larger with resistance to flow valuve, enable the DC/DC converters 100 bear larger voltage with
Electric current such that it is able to drive larger load.So the DC/DC converters 100 just have the advantages that load capacity is strong.In addition,
The DC/DC converters 100 also have processing module 120, output voltage control module 130, the inspection of tool detection module 140, temperature
Survey module 150, current detection module 160, battery voltage sensing module 170, tool switch detection module 181, protection module
182nd, 5V modules 183 and self-locking module 184.These modules can provide additional function for the DC/DC converters 100, for example, make
The DC/DC converters 100 can be applied to the electric tool of different output voltages, make the work of the DC/DC converters 100 more
It is safe and reliable etc..Therefore, the DC/DC converters 100 have the advantages that load capacity is strong, safe and reliable.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (8)
1. a kind of DC/DC converters for electric tool, including DC/DC modules, it is characterised in that the DC/DC modules bag
Pulse-width modulation circuit, device for power switching, inductance, diode and at least one output capacitor are included,
The pulse-width modulation circuit controls the conducting of the device for power switching and disconnects, one end of the device for power switching with
One end of the inductance is connected, and the other end of the device for power switching forms a voltage input end of the DC/DC modules,
The negative pole end of the diode is connected with the inductance and the device for power switching, the other end of the inductance and two pole
The positive pole of pipe forms the negative voltage output end of the positive voltage output end of the DC/DC modules and the DC/DC modules respectively, and this is born
Voltage output end is grounded, the two ends of at least one output capacitor other end and the diode respectively with the inductance
Positive terminal be connected；
The pressure voltage of the device for power switching, inductance, diode and at least one output capacitor is in more than 55V, described
DC/DC converters also include processing module and output voltage control module, the processing module and the output voltage control mould
Block is connected, and the output voltage control module is connected with the DC/DC modules, and the processing module is by the output voltage control
Molding block controls the output voltage of the DC/DC modules, and the DC/DC converters also include tool detection module, the instrument
Detection module is connected with the processing module, and the processing module controls institute according to the signal that the tool detection module is detected
State the output voltage of DC/DC modules.
2. DC/DC converters for electric tool according to claim 1, it is characterised in that the pulsewidth modulation electricity
Road includes the chip of model LM2576HVT-ADJ, the VIN ends of the chip of model LM2576HVT-ADJ and institute
The voltage input end for stating DC/DC modules is connected, OUTPUT ends and the power of the chip of model LM2576HVT-ADJ
The control end of switching device is connected.
3. DC/DC converters for electric tool according to claim 1, it is characterised in that the power switch device
Part is mos field effect transistor.
4. DC/DC converters for electric tool according to claim 1, it is characterised in that the tool detection mould
Block includes switch and tool detection module capacitance, the negative voltage output end phase of one end of the switch and the DC/DC converters
Even, the other end of the switch is connected with the processing module, one end of the tool detection module capacitance with it is described switch and
The processing module is connected, the ground phase of the other end of the tool detection module capacitance and the input of the DC/DC converters
Even.
5. DC/DC converters for electric tool according to claim 1, it is characterised in that the DC/DC converters
Also include the temperature detecting module of the temperature of the detection device for power switching, the temperature detecting module and the processing module
It is connected.
6. DC/DC converters for electric tool according to claim 1, it is characterised in that the DC/DC converters
Also include current detection module, be connected between the ground and negative voltage output end of the input of the DC/DC converters one it is electric
Resistance, the current detection module are connected with the processing module and are connected with the negative voltage output end of the DC/DC converters, institute
Current detection module is stated for detecting the electric current of the output end of the DC/DC converters.
7. DC/DC converters for electric tool according to claim 1, it is characterised in that the DC/DC converters
Also include battery voltage sensing module, the battery voltage sensing module is connected with the processing module, the cell voltage inspection
Surveying module is used for the voltage of battery of the input for detecting the DC/DC converters.
8. DC/DC converters for electric tool according to any claim in claim 1 or 4 to 7, its feature
It is that the processing module is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210506740.3A CN103856048B (en) | 2012-11-30 | 2012-11-30 | For the DC/DC converters of electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210506740.3A CN103856048B (en) | 2012-11-30 | 2012-11-30 | For the DC/DC converters of electric tool |
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| Publication Number | Publication Date |
|---|---|
| CN103856048A CN103856048A (en) | 2014-06-11 |
| CN103856048B true CN103856048B (en) | 2017-04-05 |
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| CN201210506740.3A Active CN103856048B (en) | 2012-11-30 | 2012-11-30 | For the DC/DC converters of electric tool |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105698229B (en) * | 2014-11-28 | 2018-02-02 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooking pot and its control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412558A (en) * | 2010-09-26 | 2012-04-11 | 南京德朔实业有限公司 | Over-temperature protection circuit of power device |
| CN102487210A (en) * | 2010-12-03 | 2012-06-06 | 苏州宝时得电动工具有限公司 | Electric tool and control method thereof |
-
2012
- 2012-11-30 CN CN201210506740.3A patent/CN103856048B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412558A (en) * | 2010-09-26 | 2012-04-11 | 南京德朔实业有限公司 | Over-temperature protection circuit of power device |
| CN102487210A (en) * | 2010-12-03 | 2012-06-06 | 苏州宝时得电动工具有限公司 | Electric tool and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| "LM2576/LM2576HV Series SIMPLE SWITCHER 3A Step-Down Voltage Regulator";TEXAS INSTRUMENTS;《National Semicondutor Corporation :www.national.com》;20040430;第1-24页 * |
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