CN201946959U - Power integral protection circuit for lithium battery rechargeable electric drill - Google Patents
Power integral protection circuit for lithium battery rechargeable electric drill Download PDFInfo
- Publication number
- CN201946959U CN201946959U CN2010206810137U CN201020681013U CN201946959U CN 201946959 U CN201946959 U CN 201946959U CN 2010206810137 U CN2010206810137 U CN 2010206810137U CN 201020681013 U CN201020681013 U CN 201020681013U CN 201946959 U CN201946959 U CN 201946959U
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- motor
- microprocessor
- control switch
- circuit module
- drive circuit
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Abstract
The utility model relates to the technical field of power supply circuit, in particular to a power integral protection circuit for a lithium battery rechargeable electric drill, which comprises batteries, a driving circuit module, a control switch, a microprocessor and a motor. The batteries, the driving circuit module, the control switch and the motor are electrically connected with one another in sequence, the driving circuit module is connected with the microprocessor, the batteries are respectively connected with the control switch and the microprocessor, and the control switch is connected with the input end of the microprocessor. The power integral protection circuit is simple and scientific in structural design, the maximum working time of the electric drill under the condition of being clamped and stopped is calculated when currents passing the motor are not controlled, the motor is protected by closing the return circuit of the motor and simultaneously maximum working capacity of the motor is obtained, and further the service life of products is prolonged.
Description
Technical field:
The utility model relates to the power supply circuits technical field, refers in particular to lithium cell charging and bores power integration protective circuit.
Background technology:
At present, lithium battery applications is not generally done current monitoring to lithium battery on the electric tool electric hand drill, only protects battery and motor by detecting lithium battery voltage and temperature.Because the lithium battery internal resistance is very low, if when bit freezing appears in electric hand drill, cause unable at once stopping operating, perhaps do not stop operating during bit freezing, cause burn-down of electric motor, to give to use and all cause very burden, product is not long useful life.
The utility model content:
The purpose of this utility model is at the deficiencies in the prior art; and provide lithium cell charging to bore power integration protective circuit; the simple science of its structural design; under situation about not controlling by current of electric; calculate electric drill and stop workable maximum time under the situation at card; by turn-offing electric motor loop protection motor, obtain maximum machine operation amount simultaneously, long product lifecycle.
For achieving the above object, the utility model adopts following technical scheme, it comprises battery, drive circuit module, control switch, microprocessor, motor, battery, drive circuit module, control switch, motor are electrically connected successively, drive circuit module is connected with microprocessor, battery is connected with control switch, microprocessor respectively, and control switch is connected with the microprocessor input.
Described drive circuit module provides current information for microprocessor, and microprocessor provides switching signal for drive circuit module.
The utility model beneficial effect is: battery, drive circuit module, control switch, motor are electrically connected successively; drive circuit module is connected with microprocessor; battery is connected with control switch, microprocessor respectively; control switch is connected with the microprocessor input; under situation about not controlling, calculate electric drill and stop workable maximum time under the situation, by turn-offing electric motor loop protection motor at card by current of electric; obtain maximum machine operation amount simultaneously, long product lifecycle.
Description of drawings:
Fig. 1 is a circuit working principle schematic of the present utility model;
Fig. 2 is a control flow block diagram of the present utility model;
Fig. 3 is the change procedure schematic diagram of the system operational parameters of the utility model control flow.
Embodiment:
See that Fig. 1 is to shown in Figure 3: the utility model comprises battery 1, drive circuit module 2, control switch 3, microprocessor 4, motor 5, battery 1, drive circuit module 2, control switch 3, motor 5 are electrically connected successively, drive circuit module 2 is connected with microprocessor 4, battery 1 is connected with control switch 3, microprocessor 4 respectively, and control switch 3 is connected with microprocessor 4 inputs.
Described drive circuit module 2 provides current information for microprocessor 4, and microprocessor 4 provides switching signal for drive circuit module 2.
Inner separately two parts of control switch 3, a switch are to circuit supply, and provide the information of voltage of battery 1 to microprocessor 4, and another is by drive circuit module 2 power supplies and by the rotation speed of control switch 3 control motors 5.
Drive circuit module 2 comprises current sampling circuit and high-power benefit pipe, sample circuit is the resistance alloys sampling of several milliohms by size, amplify through operational amplifier, delivering to microprocessor again handles, high-power FET is responsible for supplying power to the control motor part of control switch 3 by the switching signal control of microprocessor 4.
Inside battery contains thermistor, transfers useful information of voltage to by resistor network and supplies with microprocessor 4.
Microprocessor 4 is single-chip microcomputers of one eight high performance tape analog digital conversion (ADC), is responsible for information such as sampled voltage, electric current and battery temperature, drive circuit module 2 is controlled through handling again.
Fig. 2 is flow process of the present utility model control block diagram: the thinking of flow process control is in conjunction with actual factor, and the integration that the power P r of motor 5 is acted on the thermal power in time obtains acting on the thermal power Ev of motor 5, and judges its system that whether transfinites.
The first step when control switch 3 starts, begins circuit supply, and drive circuit module 2 is opened the power supply to control switch 3, motor 5 parts.
Second step, information such as the real time temperature Tr of microprocessor 4 collection batteries 1 and real-time voltage Vr, and judge whether to belong to normal range (NR).If exceed normal range (NR), system enters lock-out state, and the power supply that drive circuit module 2 turn-offs control switch 3, motor 5 parts is not till system powers.
If battery temperature Tr and voltage Vr are normal, microprocessor 4 continues to collect the current information of motor 5, obtains real-time current value Ir.
Microprocessor 4 multiplies each other the real-time voltage Vr and the real-time current value Ir of battery, obtains arriving the realtime power Pr of motor.
Microprocessor 4 judges by the contrast of realtime power Pr and bit freezing power constant Pm whether electric drill blocks, and bit freezing power Changshu Pm is the electric lowest power empirical average value of changeing after blocking of operating at full capacity down.
When realtime power Pr did not reach bit freezing power P m, motor 5 was in the state of high speed rotating, and the fan that motor 5 carries can well distribute the heat of motor, and the average consumption value of loosing of this energy is decided to be Ex.The heat energy that acts on the motor is defined as Ev.Because the ability major part that acts on the motor 5 is converted into kinetic energy, so the heat Ev on the motor does not have what increase, but reduce, reduction is the diffusing consumption of heat Ex.So Ev self deducts Ex and obtains new Ev value.Through time-delay, be recycled to for second step.
When realtime power Pr reaches bit freezing power P m, motor is in that the utmost point slowly runs or stop state, the fan that motor 5 carries does not rotate substantially yet, the electric energy small part transfers kinetic energy to, and major part changes into the heat energy of motor, and its ENERGY E a approximates the product of Pr and the time T a of the current system cycle of operation, it is so much that the amount of the heat energy Ev of motor has just increased Ea, so Ev self adds the Ea value, obtain the heat energy value of new motor, entering next step.
Whether the heat energy value Ev that next microprocessor 4 compares motor 5 has reached; the 5 maximum Emax that can bear, if motor heat energy value Ev has surpassed Emax, system will enter the protection locking; drive circuit module 2 turn-offs the power supply to switch control motor part, till system does not power.
If the motor 5 heat energy value Ev value of not reaching capacity Emax, system will enter delay procedure, and making each circulation timei all is Ta.Enter the next circulation of second step beginning again.
Claims (2)
1. lithium cell charging bores power integration protective circuit; it comprises battery (1), drive circuit module (2), control switch (3), microprocessor (4), motor (5); it is characterized in that: battery (1), drive circuit module (2), control switch (3), motor (5) are electrically connected successively; drive circuit module (2) is connected with microprocessor (4); battery (1) is connected with control switch (3), microprocessor (4) respectively, and control switch (3) is connected with microprocessor (4) input.
2. lithium cell charging according to claim 1 bores power integration protective circuit, and it is characterized in that: described drive circuit module (2) provides current information for microprocessor (4), and microprocessor (4) provides switching signal for drive circuit module (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206810137U CN201946959U (en) | 2010-12-27 | 2010-12-27 | Power integral protection circuit for lithium battery rechargeable electric drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206810137U CN201946959U (en) | 2010-12-27 | 2010-12-27 | Power integral protection circuit for lithium battery rechargeable electric drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201946959U true CN201946959U (en) | 2011-08-24 |
Family
ID=44474295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206810137U Expired - Fee Related CN201946959U (en) | 2010-12-27 | 2010-12-27 | Power integral protection circuit for lithium battery rechargeable electric drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201946959U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570393A (en) * | 2010-12-27 | 2012-07-11 | 东莞市妙达电动工具制造有限公司 | Power integral protection circuit of lithium battery charge drill |
-
2010
- 2010-12-27 CN CN2010206810137U patent/CN201946959U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570393A (en) * | 2010-12-27 | 2012-07-11 | 东莞市妙达电动工具制造有限公司 | Power integral protection circuit of lithium battery charge drill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20161227 |