CN201122922Y - Driving circuit of DC compressor - Google Patents
Driving circuit of DC compressor Download PDFInfo
- Publication number
- CN201122922Y CN201122922Y CNU2007201581271U CN200720158127U CN201122922Y CN 201122922 Y CN201122922 Y CN 201122922Y CN U2007201581271 U CNU2007201581271 U CN U2007201581271U CN 200720158127 U CN200720158127 U CN 200720158127U CN 201122922 Y CN201122922 Y CN 201122922Y
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- direct current
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- pwm output
- current compressor
- mcu
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Abstract
The utility model discloses a direct current compressor driving circuit, which comprises a MCU and an inverting circuit. The inverting circuit comprises two groups of control signal terminals, namely six control signal terminals of three-phase direct current positive terminals Up, Vp and Wp and three-phase direct current negative terminals Un, Vn and Wn. The MCU at least comprises two PWM output ports, a multi-channel selective circuit is connected on at least one PWM output port, and the PWM output ports are connected with the corresponding control signal terminal of the inverting circuit one to one after multiplex expansion; the gate control terminal of the multi-channel selective circuit receives the channel selection signal sent by the MCU. The driving circuit performs the r multiplex expansion to the PWM output port of the MCU chip through designing the port expanding circuit, thereby realizing the 120 degree driving control to the direct current compressor only by adopting the low port resources and the low price MCU chip, reducing the hardware cost greatly and enhancing the market competitiveness of the product.
Description
Technical field
The utility model belongs to the direct current compressor technical field, specifically, relates to a kind of circuit design that direct current compressor is realized 120 degree drive controlling.
Background technology
Direct current compressor 120 degree drive schemes are Driving technique generally using at present, and along with development of technology with to the understanding in depth of direct current compressor driven algorithm, this Driving technique has not been technical barrier.But, present Driving technique all uses the MCU chip that is exclusively used in motor to realize drive controlling, this class MCU chip has 6 road PWM output ports at least, 3 tunnel rotor position detection are caught port, also will there be resources such as PWM timer inside, have the chip price height of such resource, product market competition pressure is big, is unfavorable for promoting.
The utility model content
The utility model must adopt the MCU chip that includes 6 road PWM output ports at least to realize hardware cost height, the product competition problem of big pressure that drive controlling is brought in order to solve existing direct current compressor drive circuit, a kind of new DC compressor drive circuit is provided, by adopting the port expansion design, to reduce requirement to MCU chip port resource, thereby only need adopt the MCU chip that includes 2 road PWM output ports at least can realize 120 of direct current compressor is spent drive controlling, greatly reduce hardware cost, promoted the competitiveness of product in market.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of direct current compressor drive circuit comprises MCU and inverter circuit, and described inverter circuit comprises two groups of totally 6 tunnel control signal ends, is respectively three-phase dc positive terminal Up, Vp, Wp and three-phase dc negative pole end Un, Vn, Wn; Described MCU comprises 2 road PWM output ports at least, is connected with multichannel on the PWM output port of at least one therein road and selects circuit, and the corresponding control signal end that described PWM output port is carried out multichannel expansion back and described inverter circuit connects one to one; Described multichannel selects the gating control end of circuit to receive the channel selecting signal that MCU sends.
Wherein, wherein one road PWM output port of described MCU selects circuit to carry out wherein one group of control signal end that multichannel expansion back connects described inverter circuit by described multichannel.
When described MCU comprised 2 road PWM output ports, wherein one road PWM output port selected circuit to carry out after 3 tunnel expansions respectively the corresponding connection of three-phase dc positive terminal Up, Vp, Wp with described inverter circuit by described multichannel; Another road PWM output port selects circuit to carry out after 3 tunnel expansions respectively the corresponding connection of three-phase dc negative pole end Un, Vn, Wn with described inverter circuit by described multichannel.
When described MCU comprises 4 road PWM output ports, wherein three road PWM output ports respectively with the corresponding connection of three-phase dc positive terminal Up, Vp, Wp of described inverter circuit; Another road PWM output port selects circuit to carry out after 3 tunnel expansions respectively the corresponding connection of three-phase dc negative pole end Un, Vn, Wn with described inverter circuit by described multichannel.
Further, select to comprise 3 selector channels at least in the circuit that the wherein one group of control signal end with described inverter circuit connects one to one respectively at described multichannel, its common port connects wherein one road PWM output port of described MCU.Described MCU selects signal by its GPIO mouth output channel, connects the gating control end that described multichannel is selected circuit.
Further again, in described direct current compressor drive circuit, also include the direct current compressor rotor position detection circuit, reception is from 3 road voltage sampling signals of direct current compressor three-phase terminal, one tunnel dividing potential drop current limliting network of respectively hanging oneself connects the same road input of a comparator, another road input of described comparator connects reference voltage circuit, and its output connects wherein one road input port of described MCU.The three-phase output end of described inverter respectively with the corresponding connection of three-phase terminal of direct current compressor.
Wherein, described voltage sampling signal is the back-emf voltage that the direct current compressor rotor produces in rotary course.
Further, the voltage of in described reference voltage circuit, taking from dc bus after the potential-divider network dividing potential drop as the input that connects described comparator with reference to voltage.
Compared with prior art, advantage of the present utility model and good effect are: direct current compressor drive circuit of the present utility model carries out the multichannel expansion by the design port expansion circuit to the PWM output port of MCU chip, and save the MCU chip is caught taking of port by designing brand-new direct current compressor rotor position detection circuit, thereby only need adopt the low port resource, the MCU chip of low price can be realized 120 degree drive controlling to direct current compressor, under the prerequisite of effectively guaranteeing control of quality, greatly reduce hardware cost, be enough to satisfy the direct current compressor driving designing requirement of domestic air conditioner, significantly improved the competitiveness of product in market.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the theory diagram of the direct current compressor drive circuit of the existing MCU of employing chip 6 road PWM output control;
Fig. 2 is the improvement schematic block circuit diagram that adopts MCU chip 2 road PWM output control;
Fig. 3 is the improvement schematic block circuit diagram that adopts MCU chip 4 road PWM output control;
Fig. 4 is the contrast figure before and after the direct current compressor rotor position detection circuit improves;
Fig. 5 is the physical circuit schematic diagram of Fig. 3;
Fig. 6 is the physical circuit schematic diagram of Fig. 4.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
In the design of direct current compressor 120 degree drive controlling, mainly comprise two parts circuit design: a part is the design of PWM output scheme; Another part is the design of direct current compressor rotor position detection circuit.The utility model is also set about from this two aspect just direct current compressor drive circuit is improved, and takies in the hope of reaching minimizing MCU port resource, reduces the purpose of design of hardware cost.
At first, for the PWM output scheme, mainly be how to solve that inverter circuit IPM provides its 6 road required pwm control signals in direct current compressor drive circuit.In the prior PWM output scheme, all be to adopt 6 road PWM output ports of MCU chip directly to realize driving with the corresponding connection of 6 tunnel control signal end Up, Vp, Wp, Un, Vn, Wn of IPM, wherein, Up, Vp, Wp are respectively the three-phase dc positive terminal of IPM; Un, Vn, Wn are respectively the three-phase dc negative pole end of IPM.Inverter circuit IPM controls its internal switch circuit operation according to 6 road pwm pulse drive signals that receive, to realize the inversion conversion of direct voltage to alternating voltage, and then output U, V, W three-phase voltage connect the three-phase terminal of direct current compressor, to realize the drive controlling to compressor, its theory diagram is referring to shown in Figure 1.This design needs the MCU chip to have 6 road PWM output ports and PWM timer resource, and such a MCU chip price is very high, therefore, is unfavorable for promoting.
In improvement project of the present utility model, by the design port expansion circuit, carry out the multichannel expansion with PWM output port to the MCU chip, thereby can reduce taking to the PWM output port, the MCU chip that use cost is lower can satisfy the control requirement to inverter circuit IPM, reaches the purpose of design that reduces hardware cost, improves competitive power of product.
In design of the present utility model, the MCU chip can adopt the low-cost chip that includes 2 road PWM output ports at least to realize, is that example is specifically addressed present design with MCU chip with 2 road PWM output ports and the MCU chip with 4 road PWM output ports below.
As shown in Figure 2, when the MCU chip that is adopted only comprises 2 road PWM output ports, on each road PWM output port, all connect a multichannel and select circuit, described multichannel selects circuit should comprise 3 selector channels at least, thereby can carry out 3 tunnel expansions to each road PWM output port, form 6 road pwm signal lead-out terminal PWM_Up, PWM_Vp, PWM_Wp, PWM_Un, PWM_Vn, PWM_Wn, respectively with 6 tunnel control signal end Up, Vp, Wp, Un, Vn, the corresponding connection of Wn of inverter circuit IPM.The common port COM that described two-way multichannel is selected circuit connects one to one with 2 road PWM output ports of MCU chip respectively, gating control end A, B, C, D respectively with the corresponding connection of channel selecting signal output of MCU chip, receive the channel selecting signal of MCU chip output, and then control described multichannel and select circuit to choose wherein one tunnel alternative passage conducting, with corresponding control signal end output pwm pulse control signal to inverter circuit IPM.
Described channel selecting signal can specifically adopt 4 road GPIO mouths output of MCU chip to provide.Certainly, also can select other ports in the MCU chip to realize that the utility model does not specifically limit this.
When the PWM output port resource of the MCU chip that is adopted is relatively enriched, such as including 4 road PWM output ports, as shown in Figure 3, can only on one road PWM output port, connect multichannel like this and select circuit, it is carried out 3 tunnel expansions, and then respectively with the three-phase dc negative pole end Un of inverter circuit IPM, Vn, Wn (perhaps three-phase dc positive terminal Up, Vp, Wp) the corresponding connection, its excess-three road PWM output port can directly be connected the three-phase dc positive terminal Up of inverter circuit IPM correspondingly, Vp, last (the perhaps three-phase dc negative pole end Un of Wp, Vn, on the Wn), to realize switch control to inverter circuit IPM.
Certainly,, also can copy top implementation specific design corresponding ports expanded circuit, to satisfy demand for control to inverter circuit IPM for MCU chip with other number P WM output port.
Behind the PWM output scheme above adopting, only need revise the software program of MCU inside, realize multichannel is selected the accurate gating control of each path in the circuit, can satisfy the control requirement of inverter circuit IPM.
Secondly, for the direct current compressor rotor position detection circuit, its purpose of design mainly is to realize the waveform of the pwm signal of MCU chip output is proofreaied and correct by the real-time detection to rotor-position, to guarantee that direct current compressor is by setting requirement stable operation.Direct current compressor position detecting circuit commonly used all be adopt No. three comparison circuits respectively to the direct current compressor U that collects V the back electromotive force and the reference value of W three-phase compare, size according to back electromotive force is calculated rotor-position, shown in Fig. 4 left half, such hardware circuit more complicated, three seizure ports that need take the MCU chip come the detection rotor position, therefore, than higher, but software processes is fairly simple to the requirement of MCU chip.
What the design after the improvement adopted is three tunnel synthetic circuit forms, shown in Fig. 4 right half, one tunnel dividing potential drop current limliting network R that will respectively hang oneself from 3 road voltage sampling signal S_U, S_V, the S_W of direct current compressor three-phase terminal U V W connects the same road input (such as in-phase input end) of a comparator IC03, another road input (such as inverting input) of comparator IC03 connects reference voltage VREF, output connects wherein one road input port of MCU chip, such as interrupt signal input port INT etc.Like this, only need one of the MCU chip to catch port and can realize real-time detection to three rotor-positions, its hardware circuit structure is fairly simple, but than higher, calculate complicatedly to the requirement of software, need to cooperate the PWM output signal of MCU chip to determine jointly, but, but can realize the low cost design of hardware, therefore, be suitable for promoting the use of.
Specifically set forth the particular circuit configurations that realizes the utility model purpose of design below by two specific embodiments.
Embodiment one, and referring to shown in Figure 5, present embodiment is that example is specifically set forth the syndeton between itself and the inverter circuit IPM with the MCU chip IC 101 with 4 road PWM output ports.
Described MCU chip I C101 itself has 4 road PWM output ports, be respectively RC5, RC4, RC3, RC2, the control requirement of three-phase dc motor is not satisfied in four road PWM output, therefore, need expand one road PWM output port wherein, to realize 6 road PWM output.
As shown in Figure 5,3 road PWM output port RC3 of MCU chip IC 101, RC4, RC5 directly connect one to one with three-phase dc positive terminal Up, Vp, the Wp of inverter circuit IPM respectively, and the 4 road PWM output port RC2 connects the common port that multichannel is selected circuit.Described multichannel selects circuit can specifically adopt one 4 channel selecting chip IC 102 to realize, its common port CY connects the 4 road PWM output port RC2 of MCU chip IC 101, gating control end A, B respectively with the corresponding connection of channel selecting signal output RC1, RC0 of MCU chip IC 101, receive the channel selecting signal of MCU chip IC 101 outputs, wherein, RC1, RC0 can be the two-way GPIO mouths of MCU chip IC 101, realize selecting in the chip IC 102 selection of 3 passage 2Y0,2Y1,2Y2 by exporting 0,1 level.3 alternative passage 2Y0 of described selection chip IC 102,2Y1,2Y2 respectively with the corresponding connection of three-phase dc negative pole end Wn, Un, Vn of inverter circuit IPM.
Embodiment two, and referring to shown in Figure 6, present embodiment is specifically set forth the implementation structure of direct current compressor rotor position detection circuit.
After the three-phase back-emf voltage S_W that obtains from direct current compressor three phase terminals subsample, S_V, S_U carry out current limliting and voltage division processing through the dividing potential drop current limliting network of being made up of resistance R 301/R302/R303, R304/R305/R306, R307/R308/R309 respectively, the in-phase input end that connects comparator IC03, described comparator IC03 can specifically adopt an amplifier chip to realize.The dividing potential drop current limliting network that the inverting input of comparator IC03 is formed by resistance R 312, R316, R317 connects dc bus, and DC bus-bar voltage DC+ is carried out after the voltage division processing as using with reference to voltage.Because the compressor drum rotation can produce back electromotive force, and the back electromotive force size that the angle difference of rotation is produced is also different, in rotor rotation process, will produce the back-emf voltage of a variation like this, compare through comparator IC03 and reference voltage, thereby output measured bursts signal, wherein one road input port that connects MCU chip IC 101 through resistance R 314, such as its interrupt signal input port INT, MCU chip IC 101 is calculated rotor-position according to the pulse signal that receives and its pwm signal that sends.
The utility model is by design PWM port expansion circuit and direct current compressor rotor position detection circuit, thereby on the basis of adopting low-resource, low price MCU chip, realized drive controlling to direct current compressor 120 degree, reduced cost of hardware design, improved product market competitiveness, the direct current compressor that can be widely used in domestic air conditioner drives in the design.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1, a kind of direct current compressor drive circuit comprises MCU and inverter circuit, and described inverter circuit comprises two groups of totally 6 tunnel control signal ends, is respectively three-phase dc positive terminal Up, Vp, Wp and three-phase dc negative pole end Un, Vn, Wn; It is characterized in that: described MCU comprises 2 road PWM output ports at least, be connected with multichannel on the PWM output port of at least one therein road and select circuit, the corresponding control signal end that described PWM output port is carried out multichannel expansion back and described inverter circuit connects one to one; Described multichannel selects the gating control end of circuit to receive the channel selecting signal that MCU sends.
2, direct current compressor drive circuit according to claim 1 is characterized in that: wherein one road PWM output port of described MCU selects circuit to carry out wherein one group of control signal end that multichannel expansion back connects described inverter circuit by described multichannel.
3, direct current compressor drive circuit according to claim 2, it is characterized in that: select to comprise 3 selector channels at least in the circuit at described multichannel, wherein one group of control signal end with described inverter circuit connects one to one respectively, and its common port connects wherein one road PWM output port of described MCU.
4, direct current compressor drive circuit according to claim 2, it is characterized in that: described MCU comprises 2 road PWM output ports, and wherein one road PWM output port selects circuit to carry out after 3 tunnel expansions respectively the corresponding connection of three-phase dc positive terminal Up, Vp, Wp with described inverter circuit by described multichannel; Another road PWM output port selects circuit to carry out after 3 tunnel expansions respectively the corresponding connection of three-phase dc negative pole end Un, Vn, Wn with described inverter circuit by described multichannel.
5, direct current compressor drive circuit according to claim 3 is characterized in that: described MCU comprises 4 road PWM output ports, wherein three road PWM output ports respectively with the corresponding connection of three-phase dc positive terminal Up, Vp, Wp of described inverter circuit; Another road PWM output port selects circuit to carry out after 3 tunnel expansions respectively the corresponding connection of three-phase dc negative pole end Un, Vn, Wn with described inverter circuit by described multichannel.
6, direct current compressor drive circuit according to claim 1 is characterized in that: described MCU selects signal by its GPIO mouth output channel, connects the gating control end that described multichannel is selected circuit.
7, according to each described direct current compressor drive circuit in the claim 1 to 6, it is characterized in that: in described direct current compressor drive circuit, also include the direct current compressor rotor position detection circuit, reception is from 3 road voltage sampling signals of direct current compressor three-phase terminal, one tunnel dividing potential drop current limliting network of respectively hanging oneself connects the same road input of a comparator, another road input of described comparator connects reference voltage circuit, and its output connects wherein one road input port of described MCU.
8, direct current compressor drive circuit according to claim 7 is characterized in that: described voltage sampling signal is the back-emf voltage that the direct current compressor rotor produces in rotary course.
9, direct current compressor drive circuit according to claim 8 is characterized in that: voltage conduct after the potential-divider network dividing potential drop of taking from dc bus in described reference voltage circuit connects the input of described comparator with reference to voltage.
10, direct current compressor drive circuit according to claim 9 is characterized in that: the three-phase output end of described inverter respectively with the corresponding connection of three-phase terminal of direct current compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201581271U CN201122922Y (en) | 2007-11-28 | 2007-11-28 | Driving circuit of DC compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201581271U CN201122922Y (en) | 2007-11-28 | 2007-11-28 | Driving circuit of DC compressor |
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| CN201122922Y true CN201122922Y (en) | 2008-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007201581271U Expired - Lifetime CN201122922Y (en) | 2007-11-28 | 2007-11-28 | Driving circuit of DC compressor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227164B (en) * | 2007-11-28 | 2010-09-29 | 海信（山东）空调有限公司 | Direct current compressor drive circuit |
| CN103064001A (en) * | 2011-10-22 | 2013-04-24 | 海信（山东）空调有限公司 | Detecting method and detecting device of driving board of inverter compressor |
| CN115726017A (en) * | 2022-11-24 | 2023-03-03 | 上海博取仪器有限公司 | Electroplating device of four-ring conductivity electrode |
| CN115726017B (en) * | 2022-11-24 | 2024-05-31 | 上海博取仪器有限公司 | Electroplating device of four-ring conductivity electrode |
-
2007
- 2007-11-28 CN CNU2007201581271U patent/CN201122922Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227164B (en) * | 2007-11-28 | 2010-09-29 | 海信（山东）空调有限公司 | Direct current compressor drive circuit |
| CN103064001A (en) * | 2011-10-22 | 2013-04-24 | 海信（山东）空调有限公司 | Detecting method and detecting device of driving board of inverter compressor |
| CN103064001B (en) * | 2011-10-22 | 2016-03-23 | 海信（山东）空调有限公司 | The detection method of variable-frequency compressor driving plate and pick-up unit thereof |
| CN115726017A (en) * | 2022-11-24 | 2023-03-03 | 上海博取仪器有限公司 | Electroplating device of four-ring conductivity electrode |
| CN115726017B (en) * | 2022-11-24 | 2024-05-31 | 上海博取仪器有限公司 | Electroplating device of four-ring conductivity electrode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20080924 Effective date of abandoning: 20071128 |