Protection circuit used for brushless DC motor
A technology for protecting circuits and motors, applied in the direction of single motor speed/torque control, etc., can solve the problems of data processing chip limitations, complex peripheral circuits of motors, control, etc., and achieve the effect of improving response time
Active Publication Date: 2011-06-15
HAIER GRP CORP +1
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Problems solved by technology
However, the protection circuit uses three branches to detect separately, which will make the peripheral circuit of the motor too complicated, which is not conducive to cost control
The three branches of the protection circuit occupy three I / O interfaces of the data processing chip, and the data processing chip needs to have more I / O interfaces to meet the requirements, which constitutes a restriction on the selection of data processing chips
Method used
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[0034] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] Referring to FIG. 3 , it is a protection circuit diagram for a brushless DC motor of the present invention. The protection circuit detects and protects the U, V and W three-phase currents of the motor respectively.
[0036] In the motor driving circuit, the transistor Q1, the transistor Q2, the transistor Q3, the diode D1, the diode D2, and the diode D3 form a three-way control circuit. The base of the transistor Q1 is connected to the control terminal of the control chip, the collector is connected to the positive pole of the 220V AC power supply, the emitter is connected to the U-phase connector of the motor, the positive pole of the diode D1 is connected to the emitter of the transistor Q1, and the negative pole is conne...
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The invention relates to a protective circuit used for a brushless direct current electrode. A first input end is connected with an output end by a first resistor, a first diode and a fourth resistor which are connected in series, wherein, an anode of the first diode is connected with the first resistor, a cathode of the first diode is connected with the fourth resistor, and a first sense resistor is connected with the first input end and the ground; a second input end is connected with an output end by a second resistor, a second diode and the fourth resistor which are connected in series, wherein, an anode of the second diode is connected with the second resistor, and a cathode of the second diode is connected with the fourth resistor, a second sense resistor is connected with the second input end and the ground; a third input end is connected with an output end by a third resistor, a third diode and the fourth resistor which are connected in series, wherein, an anode of the third diode is connected with the third resistor, a cathode of the third diode is connected with the fourth resistor, and a third sense resistor is connected with the third input end and the ground; and a fifth resistor is connected with an output end and the ground. The protective circuit of the invention has simple structure, is convenient for cost control; only an I / O interface of a data processing chip is used, thereby facilitating the selection to the data processing chip.
Description
technical field [0001] The invention relates to the field of electronic circuits, in particular to a protection circuit for a brushless DC motor. Background technique [0002] With the advent of the worldwide energy crisis, energy-saving and consumption-reducing technologies have become the focus of widespread attention. As one of the most popular household appliances, traditional fixed-frequency air conditioners are gradually withdrawing from the market due to their large power consumption, and AC inverter air conditioners due to their narrow frequency conversion range and low compressor efficiency. The DC inverter air conditioner is loved by the majority of users because of its good energy saving, precise temperature control, ultra-low temperature start-up, and rapid heating. [0003] The DC frequency conversion air conditioner uses a brushless DC motor as the power device. When the brushless DC motor is working, it needs to adjust the U, V, W three-phase current to chang...
Claims
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IPC IPC(8): H02P6/08
Inventor 程永甫林凡卿刘俊杰楚毅马德新朱久长
Owner HAIER GRP CORP