CN201529014U - Wafering motor driver of coffee bean grinding machine - Google Patents
Wafering motor driver of coffee bean grinding machine Download PDFInfo
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- CN201529014U CN201529014U CN2009201791673U CN200920179167U CN201529014U CN 201529014 U CN201529014 U CN 201529014U CN 2009201791673 U CN2009201791673 U CN 2009201791673U CN 200920179167 U CN200920179167 U CN 200920179167U CN 201529014 U CN201529014 U CN 201529014U
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
- 239000003381 stabilizer Substances 0.000 description 6
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- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
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Abstract
A wafering motor driver of a coffee bean grinding machine comprises a single chip microcomputer, a power circuit, an H-bridge driving circuit, a current-limiting circuit and an over-current detecting circuit, wherein the single chip microcomputer executes control algorithm; the H-bridge driving circuit is used for motor phase conversion and braking; the current-limiting circuit is used for current closed loop control; and the over-current detecting circuit is used for wafering detection. Besides, the power circuit includes a rectifier bridge B1, a V12 power circuit and a zero crossing point detecting circuit; the H-bridge driving circuit includes a relay RL1, a relay RL2 and a relay driving circuit; a common terminal of the relay RL1 and the relay RL2 is connected with a wafering motor M; the current-limiting circuit includes a switch tube Q3, a current detecting resistor R9, a comparator U1 and a D trigger U2; the over-current detecting circuit including an optical coupled isolator U3 is in parallel connection with the current detecting resistor R9 after series connection with a resistor R13; and an output end of the optical coupled isolator U3 is connected with an IO port of the single chip microcomputer. The wafering motor driver has the advantages of being capable of not only completely eradicating short circuit of an upper bridge and a lower bridge, but also setting maximum working current and ensuring system safety to the maximum by adopting double relays for motor direction control and emergency braking and employing current sampling and over-current locking.
Description
Technical field
The utility model belongs to household electrical appliances control technology field.
Background technology
Bean-grinding coffee machine need be pressed into pie with coffee powder after the mill beans are finished, infuse coffee for next step and prepare.Cake of press motor necessity possesses the function of positive and negative rotation so, and must stand of short duration stall process, and simultaneously in order to save cost, this motor directly adopts the later high voltage source confession in commercial power rectification, so cake of press motor driver design difficulty is big, the performance requirement height.May there be three kinds of hidden danger in the common electric machine controller on bean-grinding coffee machine.
One, moment conducting simultaneously may appear in the switching tube of upper and lower brachium pontis, is short-circuited, and directly burns device;
Two, under the situation of Zheng Changyunzhuaning, shut down or switch direction of rotation, because the difference of switching time, might produce down bridge or go up the situation of the switching tube conducting simultaneously of bridge, be equivalent to the direct short-circuit of motor winding, it is very big to produce dash current, might burn device;
Three, in electric motor starting and the cake of press process, electric current obviously increases, might damage device.
Summary of the invention
The utility model provides a kind of can solve in-problem cake of press electric machine controller in the prior art, adopt double relay to carry out commutation and braking, stopped the short circuit possibility of bridge up and down, and adopted hardware circuit that current of electric is carried out Current limited Control, reliable operation, the life-span is long.
The technical scheme that its technical problem that solves the utility model adopts is:
The cake of press motor driver of bean-grinding coffee machine, comprise the single-chip microcomputer of carrying out control algolithm, the power circuit of power supply is provided, carries out the H bridge drive circuit of motor commutation and braking, carry out the current-limiting circuit of current closed-loop control and carry out the over-current detection circuit that cake of press detects.
Described power circuit, be connected with input ac power, comprise the rectifier bridge B1 that AC power is converted to dc source, described rectifier bridge B1 output power supply POWER and power ground PGND are connected V12 power circuit and zero-crossing detection circuit between described electrical source of power POWER and the power ground PGND;
Described H bridge drive circuit comprises relay R L1, relay R L2 and relay drive circuit, and the common port of described relay R L1 and relay R L2 is connected the cake of press motor M;
Described current-limiting circuit, be connected with described H bridge drive circuit, comprise switching tube Q3, flow measurement resistance R 9 and comparator U1 and d type flip flop U2, the drain electrode of described switching tube Q3 connects the normal-closed end of described relay R L1 and relay R L2, source electrode connects the in-phase input end of described flow measurement resistance R 9 and described comparator U1, the other end of described flow measurement resistance R 9 connects described power ground PGND, the inverting input of described comparator U1 connects the reference voltage VREF that is formed by resistance R 10 and resistance R 11, the output of described comparator U1 connects the reset terminal of described d type flip flop U2, the reversed-phase output of described d type flip flop U2 connects the gate pole of described switching tube Q3 by resistance R 8, the clock end of described d type flip flop U2 connects described zero passage power detection circuit, the set end connects described power ground PGND, data terminal connects power ground PGND by resistance R 12, and connects the IO mouth 1 of described single-chip microcomputer by optical coupling isolator U4;
Described over-current detection circuit comprises optical coupling isolator U3, and after resistance R 13 polyphone, in parallel with described flow measurement resistance R 9, the output of described optical coupling isolator U3 connects the IO mouth 2 and the resistance R 6 of described single-chip microcomputer, and described resistance R 6 other ends connect power supply VCC.
Described relay drive circuit is connected with described single-chip microcomputer, and described single-chip microcomputer is by controlling the state that described relay drive circuit is provided with described relay R L1 and relay R L2.
The Chang Kaiduan of described relay R L1 and relay R L2 is connected with described electrical source of power POWER, and normal-closed end is connected with described flow measurement resistance R 9.
The beneficial effects of the utility model mainly show: 1, adopt double relay to carry out commutation and braking, stopped the short circuit possibility of bridge up and down; 2, current of electric is carried out the hardware Current limited Control; 3, reliable operation, the life-span is long, and is simple in structure, and cost is low.
Description of drawings
Fig. 1 is the power circuit principle figure of the cake of press motor driver of bean-grinding coffee machine;
Fig. 2 is H bridge drive circuit, current-limiting circuit and the over-current detection circuit schematic diagram of the cake of press motor driver of bean-grinding coffee machine.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1, Fig. 2, the cake of press motor driver of bean-grinding coffee machine, comprise the single-chip microcomputer of carrying out control algolithm, the power circuit of power supply is provided, carries out the H bridge drive circuit 3 of motor commutation and braking, carry out the current-limiting circuit of current closed-loop control and carry out the over-current detection circuit that cake of press detects.
Described power circuit is connected with input ac power, comprises the rectifier bridge B1 that AC power is converted to dc source, described rectifier bridge B1 output power supply POWER and power ground PGND.Be connected V12 power circuit 1 and zero-crossing detection circuit 2 between described electrical source of power POWER and the power ground PGND.
Described V12 power circuit comprises diode D1, and anode connects described electrical source of power POWER, negative electrode connects resistance R 1, the other end of described resistance R 1 connects the negative electrode of voltage-stabiliser tube D3, and the anode of described voltage-stabiliser tube D3 connects described power ground PGND, and electrochemical capacitor C1 is in parallel with voltage-stabiliser tube D3.Described V12 power circuit generates direct current 12V voltage, for subsequent conditioning circuit provides power supply.Described zero-crossing detection circuit 2, comprise diode D2, its anode connects described electrical source of power POWER, negative electrode connects the negative electrode of voltage-stabiliser tube D4 by resistance R 2, and clock signal CLK, the anode of described voltage-stabiliser tube D4 connects described power ground PGND, described voltage-stabiliser tube D4 two ends parallel resistance R3.
Described H bridge drive circuit 3 comprises relay R L1, relay R L2 and relay drive circuit.The Chang Kaiduan of described relay R L1 and relay R L2 is connected with described electrical source of power POWER, and normal-closed end is connected with described current-limiting circuit, and common port connects the cake of press motor M.
Described relay drive circuit is connected with described single-chip microcomputer, and described single-chip microcomputer is by controlling the state that described relay drive circuit is provided with described relay R L1 and relay R L2.The IO mouth 3 of described single-chip microcomputer passes through the base stage that resistance R 4 connects triode Q1, the grounded emitter GND of described triode Q1, and colelctor electrode connects the coil of described relay R L2; The IO mouth 4 of described single-chip microcomputer passes through the base stage that resistance R 5 connects triode Q2, the grounded emitter GND of described triode Q2, and colelctor electrode connects the coil of described relay R L1.
Described current-limiting circuit comprises switching tube Q3, flow measurement resistance R 9 and comparator U1 and d type flip flop U2.Relay R L1 in the drain electrode of described switching tube Q3 and the described H bridge drive circuit 3 and the normal-closed end of relay R L2 are connected, source electrode connects the in-phase input end of described flow measurement resistance R 9 and described comparator U1, the other end of described flow measurement resistance R 9 connects described power ground PGND, the inverting input of described comparator U1 connects the reference voltage VREF that is formed by resistance R 10 and resistance R 11, the output of described comparator U1 connects the reset terminal of described d type flip flop U2, the reversed-phase output of described d type flip flop U2 connects the gate pole of described switching tube Q3 by resistance R 8, the clock end of described d type flip flop U2 connects the clock signal clk of described zero passage power detection circuit 2 outputs, the set end connects described power ground PGND, data terminal connects power ground PGND by resistance R 12, and connects the IO mouth 1 of described single-chip microcomputer by optical coupling isolator U4.Described single-chip microcomputer is controlled the startup of cake of press motor by described IO mouth 1 and is stopped.
Described over-current detection circuit comprises optical coupling isolator U3, and after resistance R 13 polyphone, in parallel with described flow measurement resistance R 9, the output of described optical coupling isolator U3 connects the IO mouth 2 and the resistance R 6 of described single-chip microcomputer, and described resistance R 6 other ends connect power supply VCC.
In sum, this controller adopts the double relay structure to carry out direction control and the brake hard of motor, and adopt hardware circuit that current of electric is carried out Current limited Control, can prevent unexpected up and down bridge short circuit, and the current overload in startup or the cake of press process, have reliable operation, the life-span is long, the plurality of advantages that cost is low.
Claims (3)
1. the cake of press motor driver of bean-grinding coffee machine, comprise the single-chip microcomputer of carrying out control algolithm, the power circuit of power supply is provided, carry out the H bridge drive circuit of motor commutation and braking, carry out the current-limiting circuit of current closed-loop control and carry out the over-current detection circuit that cake of press detects, it is characterized in that:
Described power circuit, be connected with input ac power, comprise the rectifier bridge B1 that AC power is converted to dc source, described rectifier bridge B1 output power supply POWER and power ground PGND are connected V12 power circuit and zero-crossing detection circuit between described electrical source of power POWER and the power ground PGND;
Described H bridge drive circuit comprises relay R L1, relay R L2 and relay drive circuit, and the common port of described relay R L1 and relay R L2 is connected the cake of press motor M;
Described current-limiting circuit, be connected with described H bridge drive circuit, comprise switching tube Q3, flow measurement resistance R 9 and comparator U1 and d type flip flop U2, the drain electrode of described switching tube Q3 connects the normal-closed end of described relay R L1 and relay R L2, source electrode connects the in-phase input end of described flow measurement resistance R 9 and described comparator U1, the other end of described flow measurement resistance R 9 connects described power ground PGND, the inverting input of described comparator U1 connects the reference voltage VREF that is formed by resistance R 10 and resistance R 11, the output of described comparator U1 connects the reset terminal of described d type flip flop U2, the reversed-phase output of described d type flip flop U2 connects the gate pole of described switching tube Q3 by resistance R 8, the clock end of described d type flip flop U2 connects described zero passage power detection circuit, the set end connects described power ground PGND, data terminal connects power ground PGND by resistance R 12, and connects the IO mouth 1 of described single-chip microcomputer by optical coupling isolator U4;
Described over-current detection circuit comprises optical coupling isolator U3, and after resistance R 13 polyphone, in parallel with described flow measurement resistance R 9, the output of described optical coupling isolator U3 connects the IO mouth 2 and the resistance R 6 of described single-chip microcomputer, and described resistance R 6 other ends connect power supply VCC.
2. the cake of press motor driver of bean-grinding coffee machine as claimed in claim 1, it is characterized in that: described relay drive circuit, be connected with described single-chip microcomputer, described single-chip microcomputer is by controlling the state that described relay drive circuit is provided with described relay R L1 and relay R L2.
3. the cake of press motor driver of bean-grinding coffee machine as claimed in claim 1, it is characterized in that: the Chang Kaiduan of described relay R L1 and relay R L2 is connected with described electrical source of power POWER, and normal-closed end is connected with described flow measurement resistance R 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201791673U CN201529014U (en) | 2009-09-27 | 2009-09-27 | Wafering motor driver of coffee bean grinding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201791673U CN201529014U (en) | 2009-09-27 | 2009-09-27 | Wafering motor driver of coffee bean grinding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201529014U true CN201529014U (en) | 2010-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201791673U Expired - Fee Related CN201529014U (en) | 2009-09-27 | 2009-09-27 | Wafering motor driver of coffee bean grinding machine |
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| Country | Link |
|---|---|
| CN (1) | CN201529014U (en) |
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2009
- 2009-09-27 CN CN2009201791673U patent/CN201529014U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG SCI-TECH UNIVERSITY Free format text: FORMER OWNER: LIU YU Effective date: 20101110 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 310012 302, UNIT 2, BUILDING 5, LIDONGSHAN LANE, XIHU DISTRICT, HANGZHOU CITY, ZHEJIANG PROVINCE TO: 310018 NO.5, NO.2 AVENUE, XIASHA HIGHER EDUCATION PARK, HANGZHOU CITY, ZHEJIANG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20101110 Address after: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park No. 2 Street No. 5 Patentee after: Zhejiang Sci-Tech University Address before: 310012 2, unit 5, Dongshan lane, West Lake District, Zhejiang, Hangzhou, 302 Patentee before: Liu Yu |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100721 Termination date: 20100927 |