CN104960399A - Electric air conditioning control system - Google Patents

Abstract

The invention relates to an electric air conditioner control system, which includes a controller, a power module, an evaporator temperature sensor, an internal and external circulation mode actuator, a compressor, a temperature actuator, a mode actuator, and a blower; wherein the power module adopts two vertical The placed filter capacitor prevents static electricity and prevents damage to both capacitors at the same time. The fast recovery diode is forwardly connected between the positive pole of the DC power supply and the input of the voltage regulator, which can prevent reverse connection of the power supply and protect the controller. The TVS diode is reversely connected between the input of the voltage regulator and the power ground to prevent the controller from being damaged by instantaneous pulses. In the two filter circuits, large-capacity electrolytic capacitors are used to filter out high-frequency signals, and small-capacity ceramic capacitors are used to protect large-capacity electrolytic capacitors to prevent them from heating at high frequencies. The invention can work under very stable power supply voltage and has good reliability.

Description

An electric air conditioning control system

technical field

The invention relates to an electric air-conditioning control system, in particular to an air-conditioning control system for small passenger cars. The system has the advantages of simple operation, high degree of automation, and strong reliability.

Background technique

With the development of the automobile industry and microelectronics technology, automobiles have entered millions of households as a convenient means of transportation, and the application of automobile air conditioners has become more and more extensive. And people are more and more concerned about the environment in the car. Modern large and small passenger cars all require a comfortable environment inside the car, mainly to control the temperature inside the car. The air-conditioning load changes with the environment and temperature inside and outside the car. When the engine of the car is used as the power of the air-conditioning, it is also affected by the change of the speed of the car. Therefore, the control of the automobile air conditioner is particularly meaningful and very important.

The traditional automotive air conditioning system includes controller, power module, evaporator temperature control sensor, compressor, internal and external circulation mode actuator, blower, mode actuator, temperature actuator, rear defrosting actuator, background light switch circuit, etc.; The system controls the internal and external circulation mode, post-defrosting and compressor through the output signal of the controller. Among them, the power module adopts an ordinary direct current power supply, the working voltage is unstable, and the reliability is poor. The blower, mode actuator (mode motor) and temperature actuator (cooling and heating motor) are all operated by manual knob switch, and the wind speed of the blower, the rotation of the mode motor, and the rotation of the cooling and heating motor are adjusted through the mechanical structure. The manual operation has problems such as low reliability, complex production process, poor consistency and comfort, inaccurate control, and adjustment lag.

Contents of the invention

The technical problem to be solved by the present invention is to provide an electric air conditioner control system with stable working voltage and good reliability.

In order to solve the above technical problems, the electric air conditioner control system of the present invention includes a controller, a power module, an evaporator temperature sensor, an internal and external circulation mode actuator, a compressor, a temperature actuator, a mode actuator, and a blower; the power module is the entire The control system supplies power, and the evaporator temperature sensor is connected to the controller; the controller is connected to the internal and external circulation mode actuators, compressors, temperature actuators, and mode actuators through the drive chip, and is connected to the blower through the pulse speed regulation module; it is characterized in that The above power module includes two filter capacitors placed vertically on the circuit board, fast recovery diodes, transient suppression diodes, small-capacity ceramic capacitors, large-capacity electrolytic capacitors, voltage regulators, ceramic filter capacitors, and electrolytic filter capacitors; The fast recovery diode is connected forwardly between the positive pole of the DC power supply and the input of the voltage regulator, and the output of the voltage regulator is connected to the controller; two filter capacitors are connected in series between the positive pole of the DC power supply BAT and the power ground; the transient suppression The diode is reversely connected between the input of the voltage regulator and the ground; the filter circuit composed of a small-value ceramic capacitor and a large-value electrolytic capacitor connected in parallel is connected between the input Vin of the voltage regulator and the power ground, and the ceramic filter capacitor and the electrolytic A filter circuit composed of filter capacitors connected in parallel is connected between the output Vout of the voltage regulator and the power ground.

The power module uses two vertically placed filter capacitors to prevent static electricity, which can prevent stress and avoid damage to both capacitors at the same time. The fast recovery diode is forward connected between the positive pole of the DC power supply and the input of the voltage regulator, which can prevent the reverse connection of the power supply, protect the controller, and will not be burned out in the case of reverse connection of the DC power supply. The TVS diode is reversely connected between the input of the voltage regulator and the power ground, which can prevent the controller from being damaged by instantaneous pulses. In the two filter circuits, a large-capacity electrolytic capacitor is used to filter out high-frequency signals, and a small-capacity ceramic capacitor is used to protect the large-capacity electrolytic capacitor, which can prevent it from heating at high frequencies. The voltage regulator adopts a DCDC voltage conversion chip, which can convert the unstable input voltage into a stable output voltage. The entire power module provides a very stable output voltage for the controller and individual actuators. The invention can work under very stable power supply voltage and has good reliability.

The voltage regulator LDC adopts a programmable low-power DCDC circuit, which includes an input filter capacitor, an inductor, a DCDC regulator chip, a diode, a feedback circuit composed of a feedback resistor and a programmable resistor, and a feedback circuit filter capacitor. Output filter capacitor; the inductor and diode are connected in series between the input and output of the entire regulator, and the diode is forward connected between the inductor and the output of the regulator; the filter capacitor is connected between the input of the regulator and the power ground Between; the output terminal of the entire voltage regulator is connected to the feedback resistor through the parallel wire and the feedback circuit filter capacitor, and the other end of the feedback resistor is connected to the power supply ground through the programmable feedback resistor; the voltage input terminal Vin of the DCDC voltage regulator chip is connected to The input terminal of the voltage regulator, the switching signal input terminal SW is connected to the anode of the diode, the feedback signal input terminal is connected between the feedback resistor and the programmable resistor; the filter capacitor at the output terminal is connected between the output terminal of the voltage regulator and the power ground.

The programmable resistor adopts programmable resistor AD5245, and the output voltage can be precisely controlled by changing its resistance.

Further, the present invention also includes a temperature adjustment signal acquisition circuit; the temperature adjustment signal acquisition circuit is connected to the controller for collecting the temperature adjustment signal; the temperature adjustment signal acquisition circuit includes a first branch voltage dividing resistor, a first branch output resistor, The first branch filter capacitor, the second branch voltage divider resistor, the second branch output resistor, the second branch filter capacitor, the temperature adjustment voltage divider rheostat composed of multiple resistors connected in series; the first branch voltage divider resistor and The potential between the temperature-adjusting voltage-dividing rheostats is connected to the controller through the output resistor of the first branch, and the filter capacitor of the first branch is connected between the input terminal of the controller and the power ground; the voltage-dividing resistor of the second branch is connected to the temperature-adjusting voltage dividing The potential between the rheostats is connected to the controller through the output resistance of the second branch, and the filter capacitor of the second branch is connected between the input terminal of the controller and the power ground.

The temperature adjustment signal acquisition circuit has two voltage outputs. When the gold finger copper foil of the external temperature adjustment knob slides on the input end of different gears, the difference between the two voltages output by the temperature adjustment signal acquisition circuit changes, and the controller According to the voltage difference, different control signals are output to drive the temperature actuator to work, so as to adjust the working temperature of the air conditioner. The temperature changes steadily during the control process, which greatly improves the energy utilization rate, achieves the purpose of energy saving, improves comfort, and runs smoothly. Especially in the temperature adjustment signal acquisition circuit, the temperature adjustment voltage divider rheostat is connected between the two voltage division branch resistors. Decrease and increase the other way, which increases the difference in input voltage between the two gears, thereby further improving the temperature control accuracy.

The present invention also includes a motor power supply overcurrent protection circuit; the motor power supply overcurrent protection circuit includes an overcurrent protection circuit composed of first and second overcurrent protection triodes, a first resistor, and a second resistor, a fuse, and a switch tube and the switch circuit composed of the third, fourth, and fifth resistors, the voltage feedback circuit composed of the sixth, seventh, and eighth resistors, and the output filter capacitor; the first and second overcurrent protection transistors are PNP type transistors, and the switch The tube is an NPN transistor; the output of the power module is connected to the emitter of the second overcurrent protection transistor through the first resistor, and the collector of the second overcurrent protection transistor is connected to each actuator in the control system through a fuse. The second overcurrent protection transistor supplies power to each actuator; the base of the first overcurrent protection transistor is connected to the emitter of the second overcurrent protection transistor, the emitter is connected to the output of the power module, and the collector is connected to the second overcurrent protection transistor. base; the second resistor is connected between the emitter and the collector of the first overcurrent protection transistor; the base of the second overcurrent protection transistor is grounded through the fifth resistor and the switch tube; the base of the switch tube is connected through the resistor The controller output, the fourth resistor is connected between the base of the switch tube and the ground; the sixth and eighth resistors are connected in series between the output of the motor power supply overcurrent protection circuit and the ground, and the sixth and eighth resistors are connected in series The potential is connected to the input of the controller through the seventh resistor; the output filter capacitor is connected between the output of the motor power supply overcurrent protection circuit and the ground.

The motor power supply overcurrent protection circuit is composed of the first resistor, the second resistor, the first overcurrent protection transistor, and the second overcurrent protection transistor. When the motor is short-circuited to the ground, it can play the role of overcurrent protection. The fuse also plays the role of overcurrent protection. Its response speed is faster than that of the triode. When the instantaneous current is very large, it will fuse and protect the entire current. The controller collects the feedback voltage through the seventh resistor and monitors the voltage output to the actuator. If the output voltage is large, it indicates that the circuit is working normally; when the output voltage is small, it indicates that the circuit is short-circuited, and the controller outputs a low level to control the switch. The switch tube is turned off, and the switch tube is turned on after a period of time, and then the voltage is monitored until the output voltage is normal. Improved system stability.

The present invention also includes an air volume adjustment signal acquisition circuit; the air volume adjustment signal acquisition circuit includes an air volume adjustment voltage divider resistor, an air volume adjustment voltage divider rheostat composed of a plurality of electric groups connected in series, an air volume adjustment output terminal resistance and a filter capacitor; The potential between the piezoresistor and the air volume adjustment voltage dividing rheostat is connected to the controller through the air volume adjustment output end resistance; the filter capacitor is connected between the controller input end and the power ground.

There is a gear signal input terminal between each resistor in the air volume adjustment voltage dividing rheostat. When the gold finger copper foil of the external air volume knob slides on the input end of different gear positions, the output voltage of the air volume adjustment signal acquisition circuit is different. The controller according to this The voltage outputs PWM signals with different duty ratios to adjust the output air volume, which improves the air volume control accuracy and efficiency of the air conditioning system.

The present invention also includes a mode adjustment signal acquisition circuit; the mode adjustment signal acquisition circuit includes a mode adjustment voltage divider resistor, a mode adjustment voltage divider rheostat, a mode adjustment output terminal resistor and a filter capacitor; a mode adjustment voltage divider resistor and a mode adjustment voltage divider rheostat The potential between is connected to the controller through the mode adjustment output resistor; the filter capacitor is connected between the controller input and the power ground.

There is a gear signal input terminal between each resistor in the mode adjustment voltage dividing rheostat. When the gold finger copper foil of the external mode knob slides at different gear input terminals, the output voltage of the mode adjustment signal acquisition circuit is different, and the controller according to this The voltage outputs different control signals so that the mode actuators work respectively in blowing face, blowing face blowing feet, blowing feet, blowing feet defrosting, and defrosting modes; there is a gear signal input terminal between the resistors in the temperature adjustment voltage divider rheostat . The mode adjustment signal acquisition circuit collects the position signal of the external control knob and converts it into a voltage signal, so that the controller can output different control signals according to the input signal voltage to adjust the working mode of the mode actuator, which improves the control accuracy of the air conditioning system and Use efficiency.

The pulse speed regulation module includes a first-stage amplifier, a second-stage amplifier, a filter network, and a feedback circuit; the first-stage amplifier and the second-stage amplifier form a PI controller, and the filter network includes two resistors and filters; the feedback circuit Including the feedback resistor and feedback capacitor connected in series; the PWM signal output terminal of the controller is connected to the non-inverting input terminal of the second-stage amplifier through the filter network, and the output terminal of the second-stage amplifier is connected to the first-stage amplifier through the feedback resistor and feedback capacitor. The non-inverting input of the first-stage amplifier, the output of the power module and the blower, the inverting input of the first-stage amplifier is connected to the feedback signal output of the blower, and the output of the first-stage amplifier is connected to the inverting input of the second-stage amplifier end.

The controller outputs PWM control signals with different duty ratios, and the PWM control signals are output to the blower through the pulse speed regulation module, and PI control is performed on the blower to adjust the output air volume.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural block diagram of the electric air conditioner control system of the present invention;

Fig. 2 is a circuit diagram of air volume adjustment signal acquisition;

Fig. 3 is a pattern adjustment signal acquisition circuit diagram;

Fig. 4 is a temperature adjustment signal acquisition circuit diagram;

Fig. 5 is a circuit diagram of the power module;

Fig. 6 is a voltage regulator LDC circuit diagram;

Figure 7 is the motor power supply overcurrent protection circuit;

Figure 8 is a circuit diagram of the pulse debugging module.

Detailed ways

As shown in Figure 1, the electric air-conditioning control system of the present invention comprises a controller, a power supply module, an evaporator temperature sensor, an internal and external circulation mode executor, a compressor, a temperature executor, a mode executor, and a blower; it is characterized in that it also includes an air volume Adjustment signal acquisition circuit, mode adjustment signal acquisition circuit, temperature adjustment signal acquisition circuit, motor power supply overcurrent protection circuit; the power supply module supplies power for the entire control system; evaporator temperature sensor, air volume adjustment signal acquisition circuit, mode adjustment signal acquisition circuit The temperature adjustment signal acquisition circuit is connected with the controller to collect the evaporator temperature, air volume adjustment signal, mode adjustment signal and temperature adjustment signal; the controller communicates with the internal and external circulation mode actuator, compressor, temperature actuator, and mode through the drive chip The actuator is connected to the blower through the pulse speed regulation module; the power supply module is connected to the controller, and connected to the internal and external circulation mode actuator, compressor, temperature actuator, mode actuator and blower through the motor power supply overcurrent protection circuit. Among them, the temperature acquisition by the evaporator temperature control sensor, the compressor control, and the internal and external circulation mode control are all existing technologies, and will not be repeated here.

As shown in Figure 2, the air volume adjustment signal acquisition circuit includes an air volume adjustment voltage divider resistor R46, an air volume adjustment voltage divider rheostat, an air volume adjustment output terminal resistor R47 and a filter capacitor C41; the air volume adjustment voltage divider rheostat consists of resistors R41, R42, R43 , R44, R45 in series; the potential between the air volume adjustment voltage divider resistor R46 and the air volume adjustment voltage divider rheostat is connected to the controller through the air volume adjustment output end resistor R47.

There is a gear signal input terminal between the resistors in the air volume adjustment voltage dividing rheostat. When the gold finger copper foil of the external air volume knob slides on the input end of different gear positions, the voltage dividing resistance is different, resulting in the output voltage of the air volume adjustment signal acquisition circuit. Different, the controller outputs PWM signals with different duty ratios according to the voltage, and controls the blower through the pulse speed regulation module to adjust the output air volume.

As shown in Figure 3, the mode adjustment signal acquisition circuit includes mode adjustment voltage divider resistor R51, mode adjustment voltage divider rheostat, mode adjustment output terminal resistance R52 and filter capacitor C51; mode adjustment voltage divider rheostat consists of resistors R53, R54, R55 , R56 in series; the potential between the mode adjustment voltage divider resistor R51 and the mode adjustment voltage divider rheostat is connected to the controller through the mode adjustment output terminal resistor R52.

There is a gear signal input terminal between the resistors in the mode adjustment voltage divider. When the gold finger copper foil of the external mode knob slides at different gear input terminals, the voltage divider resistors are different, resulting in the output voltage of the mode adjustment signal acquisition circuit. Different, the controller outputs different control signals according to the voltage, and drives the mode actuator by driving the chip to make it work in the blowing face, blowing face and feet, blowing feet, blowing feet defrosting, and defrosting modes.

As shown in Figure 4, the temperature adjustment signal acquisition circuit includes the first branch voltage dividing resistor R61, the first branch output resistor R62, the first branch filter capacitor C61, the second branch voltage dividing resistor R64, the second branch The output resistor R63, the second branch filter capacitor C62, and the temperature-adjusting voltage-dividing rheostat; the temperature-adjusting voltage-dividing rheostat is composed of n resistors R601, R602, R603...R60n connected in series; the first branch voltage-dividing resistor R61 is connected to the temperature The potential between the adjusting voltage dividing rheostats is connected to the controller through the first branch output resistor R62; the potential between the second branch voltage dividing resistor R64 and the temperature adjusting voltage dividing rheostat is connected to the controller through the second branch output resistor R63.

There is a gear signal input terminal between each resistor in the temperature adjustment voltage dividing rheostat. The temperature adjustment signal acquisition circuit has two voltage outputs, and the controller outputs a control signal according to the difference between the two voltages, and drives the temperature actuator to work through the driving chip. When the gold finger copper foil of the external temperature adjustment knob slides at the input end of different gears, the difference between the two voltages output by the temperature adjustment signal acquisition circuit changes, and the controller outputs different control signals to drive the temperature according to the voltage difference. The actuator works to adjust the operating temperature of the air conditioner.

As shown in Figure 5, the power module includes two filter capacitors C11 and C12 placed vertically on the circuit board, a fast recovery diode D11, a transient suppression diode D12, a small-capacity ceramic capacitor C13, a large-capacity electrolytic capacitor C14, and a stable Voltage regulator LDO, ceramic filter capacitor C15, electrolytic filter capacitor C16; the fast recovery diode D11 is forwardly connected between the positive pole of the DC power supply BAT and the input of the voltage regulator LDO, and the output of the voltage regulator LDO is connected to the controller; filter Capacitors C11 and C12 are connected in series between the positive pole of the DC power supply BAT and the power ground; the transient suppression diode D12 is reversely connected between the input of the regulator LDO and the ground; the small-capacity ceramic capacitor C13 and the large-capacity electrolytic capacitor C14 The filter circuit formed in parallel is connected between the input Vin of the voltage regulator LDO and the power ground, and the filter circuit formed by the parallel connection of the ceramic filter capacitor C15 and the electrolytic filter capacitor C16 is connected between the output Vout of the voltage regulator LDO and the power ground.

The 12V ~ 24V voltage input by the external DC power supply BAT passes through two vertically placed filter capacitors C11 and C12 to prevent static electricity. The two filter capacitors C11 and C12 are placed vertically on the circuit board to prevent stress and avoid Both capacitors are damaged at the same time. The fast recovery diode D11 is forwardly connected between the positive pole of the DC power supply BAT and the input of the LDO of the voltage regulator, which can prevent the reverse connection of the power supply, protect the controller, and will not be burned out in the case of reverse connection of the DC power supply BAT. The transient suppression diode D12 is reversely connected between the input of the voltage regulator LDO and the power supply ground. When the instantaneous voltage exceeds the normal operating voltage of the circuit, the transient suppression diode D12 will generate an avalanche and provide an ultra-low resistance path for the instantaneous current. As a result, the instantaneous current is diverted through the diode and keeps the protected circuit at cut-off voltage until the voltage returns to normal value. When the transient pulse ends, the transient suppression diode D12 automatically returns to the high-impedance state, and the entire circuit enters normal voltage, thereby preventing the controller from being damaged by the transient pulse. In the filter circuit composed of small-capacity ceramic capacitor C13 and large-capacity electrolytic capacitor C14 in parallel, the role of large-capacity electrolytic capacitor C14 is to filter out high-frequency signals, and small-capacity ceramic capacitor C13 is used to protect large-capacity electrolytic capacitor C14 , to prevent it from heating at high frequencies. The voltage regulator LDO uses a DCDC voltage conversion chip. Its main function is to provide voltage stabilization, that is, it can convert unstable input voltage into a stable output voltage. The output voltage does not change with changes in input voltage or output current. In the filter circuit composed of the ceramic filter capacitor C15 and the electrolytic filter capacitor C16, the function of the electrolytic filter capacitor C16 is to filter out high-frequency signals, and the ceramic filter capacitor C15 is used to protect the electrolytic filter capacitor C16 from heating at high frequencies. The entire power module provides a very stable output voltage for the controller and individual actuators.

As shown in Figure 6, the LDC circuit uses a programmable low-power DCDC circuit, which includes an input filter capacitor C21, an inductor L21, a DCDC regulator chip, and a diode D21, which are composed of a feedback resistor R21 and a programmable resistor R22. The feedback circuit, the feedback circuit filter capacitor C23, the output filter capacitor C22; the inductor L21 and the diode D21 are connected in series between the input end and the output end of the entire LDC circuit, and the diode D21 is forwardly connected between the inductor L21 and the LDC output end ; The filter capacitor C21 is connected between the LDC input and the power ground; the output end of the entire LDC circuit is connected to the feedback resistor R21 through a wire connected in parallel with the feedback circuit filter capacitor C23, and the other end of the feedback resistor R21 is connected to the programmable feedback resistor R22. Power supply ground; the voltage input terminal Vin of the DCDC voltage regulator chip is connected to the input terminal of the LDC circuit, the switch signal input terminal SW is connected to the anode of the diode L21, and the feedback signal input terminal is connected between the feedback resistor R21 and the programmable resistor R22; output The terminal filter capacitor C22 is connected between the LDC output terminal and the power ground.

The input voltage Vin of the voltage regulator LDC is filtered by the capacitor C21, and then passed through the DCDC voltage regulator chip to obtain an output voltage, which is fed back to the DCDC voltage regulator chip through the feedback resistor R21 and the programmable feedback resistor R22, so as to control the output voltage Vout. Purpose.

The programmable resistor R22 adopts a programmable resistor AD5245, and the output voltage can be precisely controlled by changing its resistance.

As shown in Figure 7, the motor power supply overcurrent protection circuit includes an overcurrent protection circuit composed of first and second overcurrent protection transistors Q31, Q32, a first resistor R31, and a second resistor R32, a fuse F31, and a switch A switch circuit composed of the tube Q33 and the third, fourth, and fifth resistors R33, R34, and R35, a voltage feedback circuit composed of the sixth, seventh, and eighth resistors R36, R37, and R38, and an output filter capacitor C37; , The second overcurrent protection transistors Q31 and Q32 are PNP transistors, the switch Q33 is an NPN transistor; the output of the LDC circuit is connected to the emitter of the second overcurrent protection transistor Q32 through the first resistor R31, and the second overcurrent protection transistor Q32 The collector of the collector is connected to each actuator in the control system through the fuse F31, and supplies power to each actuator (motor) through the first resistor R31 and the second overcurrent protection transistor Q32; the base of the first overcurrent protection transistor Q31 is connected to the second The emitter of the overcurrent protection transistor Q32 is connected to the output of the LDC circuit, and the collector is connected to the base of the second overcurrent protection transistor Q32; the second resistor R32 is connected across the emitter and collector of the first overcurrent protection transistor Q31 Between the electrodes; the base of the second overcurrent protection transistor Q32 is grounded through the fifth resistor R35 and the switch tube Q33; the base of the switch tube Q33 is connected to the output of the controller through the resistor R33, and the fourth resistor R34 is connected to the base of the switch tube Q33 between the pole and the ground; the sixth and eighth resistors R36 and R38 are connected in series between the output of the motor power supply overcurrent protection circuit and the ground, and the potential between the sixth and eighth resistors R36 and R38 is connected through the seventh resistor R37 input to the controller. The output filter capacitor C37 is connected between the output of the motor power supply overcurrent protection circuit and the ground.

When the motor is short-circuited to the ground, the current flowing through the first resistor R31 increases instantaneously, so that the voltage applied to both ends of the first resistor R31 exceeds the turn-on voltage of the first overcurrent protection transistor Q31. At this time, the first overcurrent protection transistor Q31 is turned on, the base voltage of the second overcurrent protection transistor Q32 is close to the output voltage of the regulator LDC, and the second overcurrent protection transistor Q32 is turned on; then the second overcurrent protection transistor Q32 Because the voltage between the base and the emitter drops below the turn-on voltage, it is turned off, thus playing the role of over-current protection. The fuse F31 also plays the role of overcurrent protection. Its response speed is faster than that of the triode. When the instantaneous current is very large, it will fuse and protect the entire current. When the controller outputs a high-level signal to the switch tube Q33 through the I/O port, the switch tube Q33 is turned on, and the voltage regulator LDC output voltage is provided to each actuator through the overcurrent protection circuit and the fuse F31. When the controller outputs a low level, the switch tube Q33 is turned off, and the regulator LDC has no output. The controller collects the feedback voltage through the seventh resistor R37, and monitors the voltage output to the actuator. If the output voltage is large, it indicates that the circuit is working normally; when the output voltage is small, it indicates that the circuit is short-circuited, and the controller outputs low-level control The switch tube Q33 is turned off, and the switch tube Q33 is turned on after a period of time, and then the voltage is monitored until the output voltage is normal.

As shown in Figure 6, the pulse speed regulation module includes a first-stage amplifier, a second-stage amplifier, a filter network, and a feedback circuit; the first-stage amplifier and the second-stage amplifier form a PI controller, and the filter network includes a resistor R706 , R707 and filter C701; the feedback circuit includes a feedback resistor R709 and a feedback capacitor C702 connected in series; the PWM signal output terminal of the controller is connected to the non-inverting input terminal of the second-stage amplifier through a filter network, and the output of the second-stage amplifier The terminal is connected to the non-inverting input terminal of the first stage amplifier, the output of the power module and the blower through the feedback resistor R709 and the feedback capacitor C702. The inverting input terminal of the first stage amplifier is connected to the feedback signal output terminal of the blower. The first stage amplifier The output of is connected to the inverting input of the second stage amplifier.

The controller outputs PWM control signals with different duty ratios, and the PWM control signals are output to the blower through the pulse speed regulation module, and PI control is performed on the blower to adjust the output air volume.

Claims (7)

1. electric air-conditioning control system comprises a controller, power module, evaporator temperature sensor, inner-outer circulation pattern actr, compressor, temperature actr, pattern actr, blowing engine; Described power module is that whole control system is powered, and evaporator temperature sensor is connected with controller; Controller by driving chip and inner-outer circulation pattern actr, compressor, temperature actr, pattern actr connect, be connected with blowing engine by chopper speed control module; It is characterized in that described power module comprises two filter capacitors (C11) and (C12) vertically placed on circuit boards, fast recovery diode (D11), Transient Suppression Diode (D12), low-capacitance ceramic condenser (C13), large capacitance chemical capacitor (C14), voltage stabilizer (LDO), ceramic filter capacitor (C15), electrolysis filter capacitor (C16); Described fast recovery diode (D11) forward is connected between the positive pole of direct supply (BAT) and the input of voltage stabilizer (LDO), and the output of voltage stabilizer (LDO) connects controller; Between the positive pole that two filter capacitors (C11) and (C12) are connected on direct supply (BAT) and power supply ground; Transient Suppression Diode (D12) Opposite direction connection is between the input and ground of voltage stabilizer (LDO); Between the input Vin that the filter circuit that low-capacitance ceramic condenser (C13) and large capacitance chemical capacitor (C14) parallel connection are formed is connected to voltage stabilizer (LDO) and power supply ground, between the output Vout that ceramic filter capacitor (C15) filter circuit formed in parallel with electrolysis filter capacitor (C16) is connected to voltage stabilizer (LDO) and power supply ground.

2. electric air-conditioning control system according to claim 1, it is characterized in that described voltage stabilizer (LDC) adopts a programmable miniwatt DCDC circuit, this circuit comprises input filtering electric capacity (C21), inductance (L21), DCDC voltage stabilizing chip, diode (D21), the reactive circuit be made up of feedback resistance (R21) and programmable resistance (R22), reactive circuit filter capacitor (C23), mouth filter capacitor (C22); Between the input end that inductance (L21) and diode (D21) are serially connected in whole voltage stabilizer (LDC) and mouth, diode (D21) forward is connected between inductance (L21) and voltage stabilizer (LDC) mouth; Filter capacitor C21 is connected between voltage stabilizer (LDC) input and power supply ground; The mouth of whole voltage stabilizer (LDC) is connected to feedback resistance (R21) by wire parallel with one another and reactive circuit filter capacitor (C23), and the other end of feedback resistance (R21) connects power supply ground by programmable feedback resistor (R22); The voltage input end Vin of DCDC voltage stabilizing chip is connected to the input end of voltage stabilizer (LDC), switch signal input end SW is connected to the positive pole of diode (L21), and feedback signal input terminal is connected between feedback resistance (R21) and programmable resistance (R22); Mouth filter capacitor (C22) is connected between voltage stabilizer (LDC) C mouth and power supply ground.

3. electric air-conditioning control system according to claim 1, characterized by further comprising temperature adjustment signal acquisition circuit; Temperature adjustment signal acquisition circuit is connected with controller, for collecting temperature adjustment signal; Temperature adjustment signal acquisition circuit comprises the first branch road divider resistance (R61), first branch road output resistance (R62), first branch road filter capacitor (C61), second branch road divider resistance (R64), second branch road output resistance (R63), second branch road filter capacitor (C62), the temperature be made up of multiple resistant series adjustment potentiometer resistance; The current potential that first branch road divider resistance (R61) and temperature adjust between potentiometer resistance passes through the first branch road output resistance (R62) connection control device, and the first branch road filter capacitor (C61) is connected between controller input end and power supply ground; The current potential that second branch road divider resistance (R64) and temperature adjust between potentiometer resistance passes through the second branch road output resistance (R63) connection control device, and the second branch road filter capacitor (C62) is connected between controller input end and power supply ground.

4. electric air-conditioning control system according to claim 1, characterized by further comprising feeding electric motors current foldback circuit; Described feeding electric motors current foldback circuit comprises the current foldback circuit be made up of first, second overcurrent protection aerotron (Q31), (Q32), the first resistance (R31), the second resistance (R32), wire fuse (F31), by switching valve (Q33) and the 3rd, the 4th, the switch circuit that forms of the 5th resistance (R33), (R34), (R35), by the 6th, the 7th, the 8th resistance (R36), (R37), (R38)) voltage feedback circuit that forms, output filter capacitor (C37); First, second overcurrent protection aerotron (Q31), (Q32) are PNP type triode, and switching valve (Q33) is NPN type triode; The output of power module connects the emitter of the second overcurrent protection aerotron (Q32) by the first resistance (R31), the collecting electrode of the second overcurrent protection aerotron (Q32), by each actr in wire fuse (F31) connection control system, is powered for each actr by the first resistance (R31), the second overcurrent protection aerotron (Q32); The base stage of the first overcurrent protection aerotron (Q31) connects the emitter of the second overcurrent protection aerotron (Q32), and emitter connects the output of power module, and collecting electrode connects the base stage of the second overcurrent protection aerotron (Q32); Between the emitter that second resistance (R32) is connected across the first overcurrent protection aerotron (Q31) and collecting electrode; The base stage of the second overcurrent protection aerotron (Q32) is by the 5th resistance (R35) and switching valve (Q33) ground connection; The base stage of switching valve (Q33) connects controller by resistance (R33) and exports, between the base stage that the 4th resistance (R34) is connected to switching valve (Q33) and ground; Six, between the 8th resistance (R36), (R38) output that is serially connected in feeding electric motors current foldback circuit and ground, the current potential between the 6th, the 8th resistance (R36), (R38) connects the input of controller by the 7th resistance (R37); Between the output that output filter capacitor (C37) is connected to feeding electric motors current foldback circuit and ground.

5. electric air-conditioning control system according to claim 1, characterized by further comprising air quantity conditioning signal Acquisition Circuit; Described air quantity conditioning signal Acquisition Circuit comprises air quantity and regulates divider resistance (R46) and regulate potentiometer resistance, air quantity regulation output end resistance (R47) and filter capacitor (C41) by the multiple electric group air quantity be composed in series; Air quantity regulates divider resistance (R46) and air quantity to regulate the current potential between potentiometer resistance to pass through air quantity regulation output end resistance (R47) connection control device; Filter capacitor (C41) is connected between controller input end and power supply ground.

6. electric air-conditioning control system according to claim 1, characterized by further comprising mode adjustment signal acquisition circuit; Described mode adjustment signal acquisition circuit comprises mode adjustment divider resistance (R51), mode adjustment potentiometer resistance, mode adjustment mouth resistance (R52) and filter capacitor (C51); Current potential between mode adjustment divider resistance (R51) and mode adjustment potentiometer resistance is by mode adjustment mouth resistance (R52) connection control device; Filter capacitor (C51) is connected between controller input end and power supply ground.

7. electric air-conditioning control system according to claim 1, is characterized in that described chopper speed control module comprises first order amplifier, second stage amplifier, filter network, reactive circuit; Described first order amplifier and second stage amplifier form PI controller, and filter network comprises two resistance (R706, R707) and filtering (C701); Reactive circuit comprises the feedback resistance (R709) and feedback capacity (C702) that are serially connected; The pwm signal mouth of controller is connected by the normal phase input end of filter network with second stage amplifier, the mouth of second stage amplifier is connected to the normal phase input end of first order amplifier, the output of power module and blowing engine by feedback resistance (R709) and feedback capacity (C702), the inverting input of first order amplifier is connected to the feedback signal output of blowing engine, and the output of first order amplifier is connected to the inverting input of second stage amplifier.