CN103023325B - Low-power-consumptiocontrol control method and circuit - Google Patents

Abstract

The invention discloses a low power consumption control method for a load, the load has a continuously changing working state, comprising the following steps: using a sensor installed on the load to obtain a state signal V ₁ that changes proportionally to the working state of the load; using The state signal V ₁ and the reference signal V ₂ generate a differential control signal V ₃ ; the differential control signal V ₃ is superimposed with a constant signal to generate an output signal V _out1+ for controlling the load. At the same time, the present invention also provides a circuit corresponding to the method. The present invention can provide a continuously changing control signal for a load with a continuously changing working state, thereby ensuring that the load has continuous power output. There are technologies that significantly reduce power loss and improve reliability.

Description

Low power consumption control method and circuit

technical field

The invention belongs to the field of circuit design, and relates to a low power consumption control method for a load with continuously changing working state characteristics and a low power consumption control circuit for the load.

Background technique

The star sensor is an important attitude measurement component in the satellite control system, which includes the probe circuit, data processing circuit, refrigerator control circuit and secondary power supply circuit of the star sensor. The power input of the star sensor is the primary power bus, and various secondary power sources used inside are provided by the secondary power circuit installed inside the star sensor.

The refrigerator used in the star sensor has a one-way refrigeration control function. According to the working characteristics of the refrigerator, when the temperature needs to be lowered in a large range, the secondary power supply circuit is required to provide a voltage of up to 5V; when the temperature needs to be adjusted in a small range, the secondary power supply circuit is required to provide a voltage of less than 5V. Therefore, the refrigerator needs a secondary power supply circuit with continuously adjustable output to power it, and the power supply voltage cannot change suddenly, such as jumping from 5V to 0V (or 0V to 5V), so as to ensure that the cooling element will not be caused by Suffering damage due to sudden changes in voltage.

In addition, the valve device used in the satellite propulsion system, the momentum wheel used in the satellite control system, etc., all need to provide continuously variable voltage.

For the above-mentioned type of load, the prior art control circuit is shown in FIG. 1 . The power supply line adopts the method of cascading power MOSFETs (or power transistors) at the output end of the secondary power supply circuit for voltage regulation, resulting in a large power loss on the MOSFET, which reduces the power of the MOS device while unnecessary loss of power. reliability.

Contents of the invention

The technical solution problem of the present invention is: aiming at the deficiencies of the prior art, a low power consumption control method for a load with continuously changing working state characteristics and a low power consumption control circuit for the load are provided. Continuously changing control signals can be provided for loads with continuously changing working states, thereby ensuring continuous power output of the loads. At the same time, compared with the prior art, the present invention significantly reduces power loss and improves reliability.

Technical solution of the present invention is:

One aspect of the present invention provides a low power consumption control method, comprising the following steps:

Use the sensor installed on the load to obtain the state signal V ₁ that changes proportionally to the working state of the load;

Using the state signal V1 and the reference signal V2 to generate _a differential control signal _{V3 ;}

The output signal V _out1+ for controlling the load is generated by superimposing the differential control signal V ₃ and the constant signal.

Further, in the above method, the load is a refrigeration device, and the sensor outputs a state signal V ₁ corresponding to the working temperature state of the refrigeration device.

Further, in the above method, the state signal V ₁ and the reference signal V ₂ are voltage signals or current signals.

Further, in the above method, the differential control signal _V3 is obtained by _{superimposing} the state signal _V1 and the reference signal V2.

Further, in the above method, the load generates a power output corresponding to a change in magnitude according to a change in magnitude of the output signal V _out1+ .

Another aspect of the present invention provides a low power consumption control circuit, which includes: _a sensor that outputs a state signal V1 that changes in direct proportion to the working state of the load, and a reference unit that generates a reference signal V2. _The circuit also includes control unit and adjustable power supply,

The control unit outputs a differential control signal V ₃ according to the state signal V ₁ and the reference signal V ₂ ;

The adjustable power supply superimposes the differential control signal V ₃ and the constant signal to generate an output signal V _out1+ for controlling the load operation.

Further, in the above circuit, the load is a refrigeration device, and the status signal v1 output by the sensor changes in direct proportion to the working temperature _of the refrigeration device.

Further, in the above circuit, the control unit is a PID controller.

Further, in the above circuit, the load generates a power output corresponding to a change in magnitude according to a change in magnitude of the output signal V _out1+ .

Further, in the above circuit, the state signal _V1 and the reference signal _V2 are voltage signals or current signals.

Compared with the prior art, the present invention has the following advantages:

1) The power supply voltage is continuously adjustable: the circuit of the prior art is shown in Figure 1. After the bus is powered on, the power supply realizes the DC/DC conversion function, and the bus voltage is converted into the power supply voltage V _out1+ = 5V required by the load, and is The sensor, reference and P regulator provide voltage; the sensor is installed on the load, and the voltage signal V ₁ related to the operating characteristics of the load is measured, and the signal is compared with the reference voltage V ₂ inside the P regulator, and the P regulator is based on the comparison signal Perform proportional control; when the control signal is greater than 4V, the MOSFET is completely turned on, and the voltage on the load is V _out1+ ; when the control signal is less than 2V, the MOSFET is gradually turned off, and the voltage of the load is gradually reduced from 5V to 0V. The drain-source voltage of the MOSFET is gradually increased from 0V to 5V; the output voltage of the power supply remains constant during this process.

The present invention is shown in Figure 3, after the bus is powered on, the adjustable power supply realizes the DC/DC conversion function, and the bus voltage is converted into the power supply voltage V _out1+ required by the load; the sensor is installed on the load, and the measured result is related to the operating characteristics of the load. The voltage signal V ₁ is compared with the reference voltage V ₂ inside the PID regulator, and the PID regulator performs PID control according to the comparison signal. The control signal is superimposed with the positive output V _out1+ of the adjustable power supply to generate the V ₃ signal and Feedback to the adjustable power supply, the adjustable power supply controls its output voltage V _out1+ according to the feedback signal; when V ₁ changes continuously, V ₃ produces continuous changes in the same proportion, and the adjustable power supply output voltage V _out1+ produces continuous changes in inverse proportion.

2) Low power consumption: the power loss on the prior art MOSFET is,

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; mosfet</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; load</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; DS</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; DS</span>}}\frac{\mathrm{<span\; class="notranslate">\; 5</span>}\mathrm{<span\; class="notranslate">\; V</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; DS</span>}}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; load</span>}}}$

Among them, R _1oad is the equivalent internal resistance of the load.

but, $\max W_{\mathrm{mosfet}}=\frac{6.25}{R_{\mathrm{load}}}$

It can be known from formula (1) that the power loss in the MOSFET in the prior art exceeds the power consumption used by the load itself.

In the present invention, since the MOSFET is no longer used, there is no corresponding power loss, and due to the reduction of power loss, the reliability of the circuit after adopting the present invention is correspondingly improved.

Description of drawings

Fig. 1 is prior art circuit diagram;

Fig. 2 is a flow chart of the method of the present invention;

Fig. 3 is a schematic circuit diagram of the present invention;

Detailed ways

The present invention will be further introduced below in conjunction with the accompanying drawings.

As shown in Figure 2, the method of the present invention realizes the continuous control of the output power of the load through the following steps after the load works:

1. Use the sensor installed on the load to obtain the state signal V ₁ that changes proportionally to the working state of the load

After the load works, its working state changes with the output power, and the sensor installed on the load can generate corresponding electrical signals through the induction of the working state of the load. An application of the present invention on a spacecraft refrigerator For example, the working state of the refrigerator is the working temperature of the refrigerator, and the sensor adopts a thermistor, which can output a voltage signal that changes in proportion to the working temperature as the state signal V ₁ by sensing the working temperature of the refrigerator. Meanwhile, the state signal V ₁ can also be a current signal obtained through a thermistor.

2. Use the state signal V ₁ and the reference signal V ₂ to generate a differential control signal V ₃

The reference signal V ₂ is a constant electrical signal, which can be the same voltage signal as that obtained by the above thermistor, or can be a current signal.

The differential control signal V ₃ can be obtained by performing a differential operation on the state signal V ₁ and the reference signal V ₂ , and the differential operation can be a superposition operation of the state signal V ₁ and the reference signal V ₂ .

3. Superimpose the differential control signal V ₃ and the constant signal to generate an output signal V _out1+ for controlling the load

The output signal V _out1+ for controlling the load operation can be obtained by further superimposing the differential control signal V ₃ obtained above with the constant signal. Corresponding to the above refrigerator, the output signal V _out1+ is the working voltage signal of the refrigerator, and the refrigerator generates a power output that responds to the changing law according to the change of the working voltage, that is, when the working voltage signal increases, the refrigerator increases the output Power; on the contrary, when the operating voltage decreases, the refrigerator reduces the output power. Corresponding to the current signal as the output signal V _out1+ , the refrigerator produces the same regular power output.

When the output power of the load changes, the working state of the load changes accordingly, and the sensor will obtain the corresponding changed state signal V ₁ again, so that the continuous adjustment of the output power of the load can be realized, and finally the load power can be adjusted. Stable output.

Fig. 3 is a schematic circuit diagram of the present invention. The circuit includes a load connected with the control circuit, a sensor installed on the load, a reference unit, a control unit and an adjustable power supply.

The loads connected to this circuit have continuously changing working conditions, such as refrigerators, valve devices, and momentum wheels.

The sensor can generate a corresponding electrical signal, that is, a state signal V ₁ , by sensing the working state of the load, and the state signal V ₁ can be a voltage signal or a current signal.

The reference unit is used to generate _a reference signal V ₂ , which has the same dimension as the state signal V ₁ .

The input of the control unit receives the above-mentioned state signal V ₁ and reference signal V ₂ respectively, and performs a differential operation on the state signal V ₁ and reference signal V ₂ to obtain a differential control signal V ₃ , the embodiment of the present invention uses a PID controller as the control unit In one implementation, the PID controller receives the state signal V ₁ and the reference signal V ₂ , and compares the state signal V ₁ with the reference signal V ₂ to generate a comparison signal of the state signal V ₁ relative to the reference signal V ₂ as Differential control signal V ₃ .

The adjustable power supply is connected with the control unit and receives the differential control signal V ₃ generated by the control unit. There is a constant voltage inside the adjustable power supply for outputting a constant signal, and the adjustable power supply generates an output signal V _out1+ for controlling the load after superimposing the differential control signal V ₃ and the constant signal.

After receiving the output signal V _out1+ , the load generates a correspondingly varying power output according to the magnitude of the output signal V _out1+ .

In the embodiment of the present invention, the load that can produce continuous working state changes is not limited to the refrigerator, and can also provide power for valve devices, momentum wheels, and the like.

Compared with the prior art, the power loss has been significantly reduced by adopting the present invention, and in the prior art as shown in Figure 1, the maximum power loss on the MOSFET is Exceeds the maximum power consumption used by the load itself R _load is the load resistance.

In the present invention, since the MOSFET is no longer used, there is no corresponding power loss, and due to the reduction of power loss, the reliability of the circuit after adopting the present invention is correspondingly improved.

Parts not described in detail in the present invention belong to the common knowledge of those skilled in the art.

Claims (2)

1., for a Low-power-consumptiocontrol control method for load, described load has continually varying operating state, it is characterized in that, comprises the following steps:

The transducer being installed on load is utilized to obtain the status signal V changed with load operating condition direct ratio ₁;

Utilization state signal V ₁with reference signal V ₂produce difference control signal V ₃;

By described difference control signal V ₃the regulated power supply output voltage V of control load is used for the superimposed rear generation of constant signal _out1+;

Described load is refrigerating plant, and described transducer exports the status signal V corresponding with refrigerating plant working temperature state ₁;

Described status signal V ₁with described reference signal V ₂for voltage signal or current signal;

Described difference control signal V ₃by described status signal V ₁with reference signal V ₂superimposed acquisition;

Described load is according to regulated power supply output voltage V _out1+size variation produce the power stage of corresponding size variation.

2. for a low power consumpting controling circuit for load, for having the load of consecutive variations operating state, this circuit comprises: export the status signal V changed with the operating state direct proportion of described load ₁transducer, produce reference signal V ₂reference cell, it is characterized in that: this circuit also comprises control unit and regulated power supply,

Described control unit is according to status signal V ₁with reference signal V ₂output difference dividing control signal V ₃;

Described regulated power supply is by difference control signal V ₃the regulated power supply output voltage V of control load work is used for the superimposed rear generation of constant signal _out1+;

Described load is refrigerating plant, the status signal V that described transducer exports ₁change in direct ratio with refrigerating plant working temperature;

Described control unit is PID controller;

Described load is according to regulated power supply output voltage V _out1+size variation produce the power stage of corresponding size variation;

Described status signal V ₁with described reference signal V ₂for voltage signal or current signal.