CN208797864U - The AC-DC brushless motor drive circuit of duplicate protection lithium battery - Google Patents
The AC-DC brushless motor drive circuit of duplicate protection lithium battery Download PDFInfo
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- CN208797864U CN208797864U CN201821020733.1U CN201821020733U CN208797864U CN 208797864 U CN208797864 U CN 208797864U CN 201821020733 U CN201821020733 U CN 201821020733U CN 208797864 U CN208797864 U CN 208797864U
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- lithium battery
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- brushless motor
- circuit
- motor drive
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Abstract
The utility model discloses a kind of AC-DC brushless motor drive circuits of duplicate protection lithium battery, including lithium battery and the brushless motor being connected with lithium battery, it further include control circuit, the motor drive circuit being connected with brushless motor, the booster circuit being connected with lithium battery, the lithium battery protection circuit being connected with lithium battery, control circuit includes control chip, 18th resistance, first capacitor, second triode, 5th resistance, 14th resistance, twelfth resistor and the 20th resistance, 18th resistance is connected on the anode of lithium battery and the power pins of control chip.The structure setting of the utility model is reasonable, can effectively reduce system low cost, and can guarantee the service life of lithium battery, stability in use is good and practical.
Description
Technical field
The utility model belongs to motor drive circuit technical field, and in particular to a kind of alternating current-direct current of duplicate protection lithium battery
Brushless motor driving circuit.
Background technique
The product more demanding to lithium battery needs to carry out lithium battery to overcharge protection, low-voltage variation and overcurrent protection, passes
It in system technology, needs to design various protection circuits, not only considerably increases design difficulty, and substantially increase and make
With cost, so applicability and practicability are restricted.
Utility model content
The good duplicate protection lithium battery of reasonable and stability in use the purpose of the utility model is to provide a kind of structure setting
AC-DC brushless motor drive circuit.
The technical solution for realizing the utility model aim is a kind of AC-DC brushless motor driving of duplicate protection lithium battery
Circuit further includes control circuit including lithium battery and the brushless motor being connected with the lithium battery, with the brushless motor phase
The motor drive circuit of connection, the booster circuit being connected with the lithium battery, and the lithium battery being connected with the lithium battery
Circuit is protected, the control circuit includes control chip, the 18th resistance, first capacitor, the second triode, the 5th resistance, the
14 resistance, twelfth resistor and the 20th resistance, the 18th resistance are connected to the anode and control chip of lithium battery
In power pins, the other end of thirteenth resistor is connected to the anode of brushless motor after thirteenth resistor is connected with the 14th resistance
Upper and the 14th resistance the other end is connected on the collector of the second triode, the emitter ground connection of second triode and
The base stage of second triode is by the 20th resistance eutral grounding, and the 5th resistance is connected to the base stage of the second triode and motor drives
On dynamic circuit, the FB pin of the control chip is connected on thirteenth resistor and the 14th ohmic connection points.
The booster circuit includes the first inductance, the 4th diode, the first metal-oxide-semiconductor, the 9th resistance, the tenth resistance and second
Capacitor, the other end of the first inductance is connected to the anode and the four or two of lithium battery after first inductance and the 4th Diode series
The cathode of pole pipe is connected on the anode of brushless motor, and the drain electrode of first metal-oxide-semiconductor is connected to the first inductance and the four or two pole
On the tie point of pipe, source electrode is grounded and grid is connected on the PWM pin of control chip by the 9th resistance, the tenth resistance
It is connected between the grid and ground wire of the first metal-oxide-semiconductor.
The lithium battery protection circuit includes Li battery protection IC, the 7th resistance, the 4th capacitor and the 6th resistance, described
The cathode of lithium battery is connected to the VSS pin of Li battery protection IC and the V- pin of Li battery protection IC passes through the 7th electricity
Resistance ground connection, the VDD pin of the Li battery protection IC is connected on the anode of lithium battery by the 6th resistance and the 4th capacitor
It is connected between the VDD pin of Li battery protection IC and the cathode of lithium battery.
Further include USB charging interface, the USB charging interface be connected by lithium battery charging chip with lithium battery and
The anode of USB charging interface is connected on booster circuit by the first unilateral diode.
Voltage-dividing detection circuit, the voltage-dividing detection circuit are provided between the anode and ground wire of the USB charging interface
It is connected with the control chip, the voltage-dividing detection circuit includes concatenated first resistor and the 19th resistance, the control
The Exp pin of chip is connected on the tie point of first resistor and the 19th resistance.
The motor drive circuit includes the first triode, eleventh resistor and twelfth resistor, the brushless motor
Cathode is connected on the collector of the first triode, the emitter of the first triode ground connection and base stage are connected by eleventh resistor
On the FAN pin of control chip, the twelfth resistor is connected between the base stage and emitter of the first triode, and described the
Five resistance are connected on the tie point of eleventh resistor and control chip.
It further include the key circuit and indicator light circuit being connected with the control chip.
The utility model has the effect of positive: the structure setting of the utility model is reasonable, is provided with control circuit, no
But booster circuit and motor drive circuit can be controlled by controlling chip, but also the 13rd electricity of detection can be passed through
Resistance and the 14th electric resistance partial pressure voltage, boosting can be turned off when occurring abnormal and motor drives, and cooperate lithium battery protection circuit
It can effectively realize and duplicate protection is carried out to lithium battery, not only design is simple, can effectively reduce system low cost, and can be with
Guarantee the service life of lithium battery, stability in use is good and practical.
Detailed description of the invention
In order to be more likely to be clearly understood the content of the utility model, below according to specific embodiment and combine attached
Figure, is described in further detail the utility model, in which:
Fig. 1 is the electrical block diagram of the utility model.
Specific embodiment
(embodiment 1)
Fig. 1 shows a kind of specific embodiment of the utility model, and wherein Fig. 1 is that the circuit structure of the utility model shows
It is intended to.
See Fig. 1, a kind of AC-DC brushless motor drive circuit of duplicate protection lithium battery, including lithium battery BT and with institute
The brushless motor M that lithium battery BT is connected is stated, further includes control circuit 1, the motor driving electricity being connected with the brushless motor M
Road 2, the booster circuit 3 being connected with the lithium battery BT, and the lithium battery protection circuit 4 being connected with the lithium battery BT,
The control circuit 1 include control chip U1, the 18th resistance R18, first capacitor C1, the second triode Q3, the 5th resistance R5,
14th resistance R14, twelfth resistor R12 and the 20th resistance R20, the 18th resistance R18 are connected to lithium battery BT's
In the power pins of anode and control chip U1, thirteenth resistor R13 after thirteenth resistor R13 connects with the 14th resistance R14
The other end be connected on the anode of brushless motor M and the other end of the 14th resistance R14 is connected to the collection of the second triode Q3
On electrode, the emitter of the second triode Q3 is grounded and the base stage of the second triode Q3 is grounded by the 20th resistance R20,
The 5th resistance R5 is connected on base stage and the motor drive circuit 2 of the second triode Q3, and the FB of the control chip U1 draws
Foot is connected on thirteenth resistor R13 and the 14th resistance R14 tie point.
The booster circuit 3 includes the first inductance L1, the 4th diode D4, the first metal-oxide-semiconductor Q1, the 9th resistance R9, the tenth
The other end of the first inductance L1 is connect after resistance R10 and the second capacitor C2, the first inductance L1 and the 4th diode D4 series connection
In the anode of lithium battery BT and the cathode of the 4th diode D4 is connected on the anode of brushless motor M, the first metal-oxide-semiconductor Q1's
Drain electrode be connected to the first inductance L1 on the tie point of the 4th diode D4, source electrode is grounded and grid is connect by the 9th resistance R9
On the PWM pin of control chip U1, the tenth resistance R10 is connected between the grid and ground wire of the first metal-oxide-semiconductor Q1.This reality
It applies in example, the first metal-oxide-semiconductor is N-channel MOS pipe.Second triode and the first triode are NPN type triode.
The lithium battery protection circuit 4 includes Li battery protection IC U3, the 7th resistance R7, the electricity of the 4th capacitor C4 and the 6th
R6 is hindered, the cathode of the lithium battery BT is connected to the VSS pin of Li battery protection IC U3 and Li battery protection IC U3
V- pin is grounded by the 7th resistance R7, and the VDD pin of the Li battery protection IC U3 is connected to lithium by the 6th resistance R6
On the anode of battery and the 4th capacitor C4 is connected between the VDD pin of Li battery protection IC and the cathode of lithium battery.
It further include USB charging interface USB, the USB charging interface USB passes through lithium battery charging chip 5 and lithium battery BT
It is connected and the anode of USB charging interface is connected on booster circuit by the first unilateral diode D1.
Voltage-dividing detection circuit 6, the partial pressure detection are provided between the anode and ground wire of the USB charging interface USB
Circuit 6 is connected with the control chip U1, and the voltage-dividing detection circuit 6 includes concatenated first resistor R1 and the 19th resistance
The Exp pin of R19, the control chip U1 are connected on the tie point of first resistor and the 19th resistance.
The motor drive circuit 2 includes the first triode Q2, eleventh resistor R11 and twelfth resistor R12, the nothing
The cathode of brush motor M is connected on the collector of the first triode Q2, the emitter of the first triode Q2 ground connection and base stage pass through
Eleventh resistor R11 is connected on the FAN pin of control chip U1, and the twelfth resistor R12 is connected to the first triode Q2
Base stage and emitter between, the 5th resistance be connected to eleventh resistor and control chip tie point on.The present embodiment
In, the second triode and the first triode are NPN type triode.
It further include the key circuit 7 and indicator light circuit 8 being connected with the control chip U1.
After pressing switch, control chip enters working condition, provides the high-frequency of a fixed duty cycle by PWM foot
Signal, by the booster circuit being made of inductance L1, field-effect tube Q1, diode D4, capacitor C2, resistance R9 and R10, by lithium electricity
Cell voltage boosts to certain voltage value, supply brushless motor work, then gives FAN foot, conducting three by providing a high level
Pole pipe Q2 drives brushless motor.
When using lithium battery power supply, booster circuit work is supplied to by diode D2；It is supplied when using circumscribed USB 5V
When electric, external voltage is supplied to booster circuit by diode D1 and works, due to there is electricity between USB 5V and lithium battery voltage
Pressure difference, if relatively high boost voltage can be generated using same boost frequency and duty ratio, in order to use for the two power supply time differences
Different reduction, therefore IC passes through detection by the branch pressure voltage of resistance R1 and R10, judges whether there is external USB 5V, so as to adjust
The frequency and duty ratio of PWM foot.Meanwhile circumscribed USB 5V is also charged by lithium battery charging IC to lithium battery.External
In the case that USB 5V is sufficient, since lithium battery BT end voltage is certainly lower than booster circuit input terminal voltage, diode D2's
Under effect, in the case where circumscribed USB 5V is sufficient, even if working on one side, lithium battery can also be full of；When circumscribed USB 5V is insufficient
In the case where powering and charge, booster circuit work can also be provided current to from lithium battery end.
To prevent motor from unloaded or abnormal situation occur, the moment detects R13 during brushless motor work
With the branch pressure voltage of R14 composition, in the case where there is exception, i.e. shutdown boosting and motor driving.It is closed simultaneously in motor
When, the end Fan is low level, all current loss is closed, while controlling chip to enter sleep state, by the function of product entirety
Consumption is preferably minimized.
U3 is Li battery protection IC, have overcurrent, over-voltage, low-voltage lock defencive function, the case where not protecting it
Under, be equivalent to short circuit between Li battery protection IC ground to battery, when being protected, battery and Li battery protection IC
Ground it is separated, protected.
Chip U1 is controlled simultaneously with low battery defencive function, but when lithium battery is put into certain voltage, control chip
It will close so port, is directly entered sleep state, lithium battery be protected, and lithium battery charging chip also has charger
Protective function can stop charging to lithium battery when lithium battery voltage is charged to certain value.And the mistake of lithium battery charging chip
Charging pressure point can be higher than the over-voltage protection point of U3, and the under-voltage protection point for controlling the over-discharge point voltage ratio U3 of chip U1 is high,
For generally, the lithium battery that has been duplicate protection, when other 1 chip goes wrong or is abnormal, other 1 chip
It continues to protect lithium battery, prevents problem.Simultaneously with this, on booster circuit there are reaction type detection, when loading out
When now abnormal, control chip U1 will close it, and all there is overcurrent protections by U3, are made that duplicate protection function to lithium battery
Energy.
The structure setting of the utility model is reasonable, is provided with control circuit, not only can be by control chip to boosting
Circuit and motor drive circuit are controlled, but also can by detection thirteenth resistor and the 14th electric resistance partial pressure voltage,
Boosting can be turned off when occurring abnormal and motor drives, and cooperation lithium battery protection circuit, which can be realized effectively, carries out lithium battery
Duplicate protection, not only design is simple, can effectively reduce system low cost, and can guarantee the service life of lithium battery, make
It is good and practical with stability.
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.And the obvious changes or variations that these connotations for belonging to the utility model are extended out still fall within it is practical
Novel protection scope.
Claims (7)
1. a kind of AC-DC brushless motor drive circuit of duplicate protection lithium battery, including lithium battery and it is connected with the lithium battery
The brushless motor connect, it is characterised in that: it further include control circuit, the motor drive circuit being connected with the brushless motor, with
The booster circuit that the lithium battery is connected, and the lithium battery protection circuit being connected with the lithium battery, the control circuit
Including control chip, the 18th resistance, first capacitor, the second triode, the 5th resistance, the 14th resistance, twelfth resistor and
20th resistance, the 18th resistance are connected on the anode of lithium battery and the power pins of control chip, thirteenth resistor
After connecting with the 14th resistance the other end of thirteenth resistor be connected on the anode of brushless motor and the 14th resistance it is another
End is connected on the collector of the second triode, and the emitter of second triode is grounded and the base stage of the second triode passes through
20th resistance eutral grounding, the 5th resistance are connected in the base stage and motor drive circuit of the second triode, the control core
The FB pin of piece is connected on thirteenth resistor and the 14th ohmic connection points.
2. the AC-DC brushless motor drive circuit of duplicate protection lithium battery according to claim 1, it is characterised in that: institute
It states booster circuit and includes the first inductance, the 4th diode, the first metal-oxide-semiconductor, the 9th resistance, the tenth resistance and the second capacitor, it is described
The other end of the first inductance is connected to the anode of lithium battery and bearing for the 4th diode after first inductance and the 4th Diode series
Pole is connected on the anode of brushless motor, and the drain electrode of first metal-oxide-semiconductor is connected to the connection of the first inductance and the 4th diode
On point, source electrode ground connection and grid be connected on the PWM pin for controlling chip by the 9th resistance, the tenth resistance is connected to the
Between the grid and ground wire of one metal-oxide-semiconductor.
3. the AC-DC brushless motor drive circuit of duplicate protection lithium battery according to claim 2, it is characterised in that: institute
Stating lithium battery protection circuit includes Li battery protection IC, the 7th resistance, the 4th capacitor and the 6th resistance, and the lithium battery is born
Pole is connected to the VSS pin of Li battery protection IC and the V- pin of Li battery protection IC passes through the 7th resistance eutral grounding, described
The VDD pin of Li battery protection IC is connected on the anode of lithium battery by the 6th resistance and the 4th capacitance connection is in lithium battery
It protects between the VDD pin of chip and the cathode of lithium battery.
4. the AC-DC brushless motor drive circuit of duplicate protection lithium battery according to claim 3, it is characterised in that: also
Including USB charging interface, the USB charging interface is connected by lithium battery charging chip with lithium battery and USB charging interface
Anode be connected on booster circuit by the first unilateral diode.
5. the AC-DC brushless motor drive circuit of duplicate protection lithium battery according to claim 4, it is characterised in that:
Voltage-dividing detection circuit, the voltage-dividing detection circuit and the control are provided between the anode and ground wire of the USB charging interface
Chip is connected, and the voltage-dividing detection circuit includes concatenated first resistor and the 19th resistance, and the Exp of the control chip draws
Foot is connected on the tie point of first resistor and the 19th resistance.
6. the AC-DC brushless motor drive circuit of duplicate protection lithium battery according to claim 5, it is characterised in that: institute
Stating motor drive circuit includes the first triode, eleventh resistor and twelfth resistor, and the cathode of the brushless motor is connected to
On the collector of first triode, the emitter of the first triode ground connection and base stage control chip is connected to by eleventh resistor
FAN pin on, the twelfth resistor is connected between the base stage and emitter of the first triode, the 5th resistance connection
On the tie point of eleventh resistor and control chip.
7. the AC-DC brushless motor drive circuit of duplicate protection lithium battery according to claim 6, it is characterised in that: also
Including the key circuit and indicator light circuit being connected with the control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821020733.1U CN208797864U (en) | 2018-06-29 | 2018-06-29 | The AC-DC brushless motor drive circuit of duplicate protection lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821020733.1U CN208797864U (en) | 2018-06-29 | 2018-06-29 | The AC-DC brushless motor drive circuit of duplicate protection lithium battery |
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| CN208797864U true CN208797864U (en) | 2019-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821020733.1U Active CN208797864U (en) | 2018-06-29 | 2018-06-29 | The AC-DC brushless motor drive circuit of duplicate protection lithium battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661472A (en) * | 2018-06-29 | 2020-01-07 | 广东金莱特电器股份有限公司 | AC/DC brushless motor driving circuit for double protection lithium battery |
-
2018
- 2018-06-29 CN CN201821020733.1U patent/CN208797864U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661472A (en) * | 2018-06-29 | 2020-01-07 | 广东金莱特电器股份有限公司 | AC/DC brushless motor driving circuit for double protection lithium battery |
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