RU2148855C1 - Programmed temperature regulator - Google Patents

Abstract

FIELD: automatic control equipment, in particular, for controlling gas and electric water boilers. SUBSTANCE: device has two digital thermometers, which are connected to microprocessor, mode setting unit, which is connected to microprocessor and mode indication unit, digital indication unit, which is connected to microprocessor and mode setting unit, non-volatile memory unit, which is connected to microprocessor through bidirectional address and data bus. Relay output of microprocessor is connected to output of temperature regulator through power unit. EFFECT: increased functional capabilities, facilitated usage. 1 dwg

Description

 The invention relates to automatic control devices and can be used for programmed temperature control, in particular as a temperature controller for controlling gas and electric water heating boilers.

 The problem of modern temperature controllers is their high overall mass characteristics (GMC) at a given accuracy (error) of temperature maintenance, or vice versa with acceptable GMC, a high error of temperature maintenance, and sometimes both.

 A separate problem is the versatility of temperature controllers, i.e., the creation of a controller capable of maintaining a given temperature regime, for example, indoor air and / or water in a heating boiler.

 The well-known "Household temperature regulator" (see RF patent N 2109320 from 02.22.95 g CL C 05 D 23/02) is a device for automatically maintaining a given temperature in rooms or storages - a temperature regulator containing a control circuit from a series-connected resistor, diode, temperature sensor - thermal contact, execution circuit from an electronic thyristor switch connected in series with the load, the negative pole of the diode being simultaneously connected to the control terminal of the thyristor, and a signal light connected in series to the circuit olneniya, and the control circuit sequentially introduced normally closed contacts toggle control.

 The disadvantage of this device is the low accuracy of maintaining a given temperature, due to the poorly selected temperature sensor and the circuit implementation of the electronic part.

 Also known is the "Automatic controller" (see RF patent N 1786467 dated 06/19/89 G 05 D 13/02), containing a sensor and a variable parameter setter connected by outputs to the corresponding inputs of the comparison unit, a driver of the control signal and an actuator, the output of which is the output of the automatic controller (AR), and the driver of the control signal contains two analog-to-frequency converters (AFC) and a frequency-phase discriminator (ChFD), the inputs of the AFC are connected to the output of the comparison unit, and the outputs of the AFC are connected to the corresponding PSD conductive inputs, whose output is connected to the input of the actuator.

 The disadvantage of this device is its complexity, hence the high GMC.

 The most advanced instruments for measuring and regulating temperature are automatic bridges and potentiometers of the tracking balancing transformation (see Temperature Measurements, Handbook, Kiev, Naukova Dumka, 1989, p. 512).

The disadvantage of such devices is:
high GMH;
complexity of circuit design;
the spatial dispersion of thermal resistance and the measuring part leads to the appearance of thermopower in the conversion circuit, which negatively affects the accuracy.

 Also known is a device for programmatically controlling the temperature of inertial objects, containing a high-speed control loop, consisting of a power supply unit, a software setpoint with a relay output, which is the device output (see RF patent N 1.817.070 G 05 D 23/19) - prototype.

The disadvantage of this device is:
high GMC and inability to use with long communication lines, i.e. away from the source of regulation, for example, ≥ 100 m.

An object of the invention is the expansion of functionality and performance due to:
the ability to work on long lines;
the possibility of choosing regulation of both water and air temperature;
the ability to work in standby mode;
GMH reduction due to the proposed circuit solution.

 To this end, a device is proposed that includes a power supply unit (PSU), a program controller (microprocessor), the relay outputs of which are connected to a power unit, the outputs of which are the device outputs, the first and second digital thermometers (CT) are additionally introduced into the device, non-volatile a storage device (En ZU), an audible alarm unit (BSS), a mode setting unit (BZR), a mode indication unit (BIR) and a digital indication unit (BCR), the outputs of the first and second digital thermometers being connected to the first and second with the information inputs of the MP, respectively, and the information output of the BZR with the third information input of the MP and with the information input of the BIR, the gate output of the BZR is connected to the enabling input of the BIC, the indicator output of the MP is connected to the control inputs of the BIR and BTS, and the MP is connected to a bi-directional address bus and data from the EnZU, and the sync output of the MP is connected to the sync input of the EnZU, the control output of the PSU is connected to the input of zeroing the MP, the audio output of the MP is connected to the sound signaling unit (BSS).

The drawing shows a block diagram of a device where:
1 - MP, 2 - EnZU, 3 and 4 - CT, 5 - BZS, 6 - BZR, 7 - BIR, 8 - BTSI, 9 - power unit, 10 - BP.

 The outputs of CT 3 and 4 are connected to the first and second inputs of MP1, respectively, the control output BP10 is connected to the input of zeroing MP1, a bi-directional bus of the address and data connects MP1 and EnZU2, and the sync output MP1 is connected to the sync input EnZU2, the audio output MP1 is connected to BZ55, information output BZR6 is connected to the third information input MP1 and to the information input BIR7, the gate output BZR6 is connected to the enabling inputs of BTSI8, the indicator output MP1 is simultaneously connected to the control inputs of BIR7 and BTS8, the power output MP1 is connected to the forces block 9, the outputs of which are the outputs of the device. The power supply bus of the temperature controller from BP10 is not conventionally shown in the drawing.

These blocks are:
MP1, for example, type P1C16C57 with corresponding peripherals
(see DALLAS SEMICONDUCTOR
UNITED STATES, TEXAS 75 244-3292 1997, p. 763);
EnZU, for example, type EE24CO2CB1
(see catalog TECHNISCHER KATALOG 96/47, Germany p. 106);
Digital thermometers 3 and 4, for example, type DS1820
(see catalog TECHNISCHER KATALOG 96/47, Germany p. 121);
BCI, for example, type LTS546 AP
(see catalog TECHNISCHER KATALOG 96/47, Germany p. 450).

The device operates in three modes:
mode for selecting and setting the desired value of water temperature;
mode for selecting and setting the desired value of the air temperature in the room;
setting mode of "standby" water temperature or "standby" air temperature in the room.

 The mode of selecting and setting the desired value of water temperature.

 When the thermostat is turned on after setting the rated supply voltage from the control output BP10, a signal passes to the input of zeroing MP1, after which the current value of the water temperature is displayed on the BCI8 through the indicator output from MP1, and the Water LED on BIR7 lights up. There are buttons on BZR6: "Mode", ">", "<", and on VIR7 there are three LEDs: "Air", "Water" and "Standby mode". The “Mode” button is pressed on BZR6, while MP1 through the third information input processes the signal of this button (according to the specified algorithm of work recorded in the program) and through the indicator output the previously set water temperature value is displayed on BTS8, and the “Water” flashing LED on BIR7 " The desired value of the water temperature is selected by successively pressing the "<" or ">" button on the BZR6, controlling the desired value on the BTS8. After selecting the desired water temperature, press the “Mode” button on BZR6, after which the “Water” LED starts to glow steadily and the current water temperature is displayed on the indicators BTS8, and the selected water temperature value is recorded through the third information input MP1 and then through the address and data bus to EnZU2 by the synchronization signal. The temperature controller starts to work. Data on the temperature of the water in the boiler with a central heating station through the first information input in the form of a serial code is sent to MP1, where it is continuously compared with the set and recorded in EnZU2, according to the results of the comparison, MP1 decides whether the water heating in the boiler is turned on or off and gives a relay command to the power unit 9, the power contacts of which are included in the load circuit.

 The mode of selecting and setting the desired value of the air temperature in the room.

 The “Mode” button is pressed on the BZR6 until the “Air” LED flashes on the BIR7, while the signal from the information output of the “Mode” button on the BZR6 is fed through the third information input to MP1 and on the BIR7, and also through the gate output from the BZR6 to the enable input BTSI8, on the indicators of which the previously set value of the air temperature is displayed. The desired air temperature is selected by successively pressing the ">" or "<" button on the BZR6 to the desired one, as when choosing the water temperature. After that, the “Mode” button on BZR6 is pressed until a steady glow of the “Air” LED on BIR7 appears. On indicators BTS8 the current air temperature is displayed.

 In this mode, the device operates in the same way as in the "Water" mode, only a digital thermometer in this case, the second CT4.

 The setting mode of the "standby" temperature of water or air in the room.

The values of the "standby" temperature of water and air are recorded in memory cells MP1 during programming. This mode is applied in cases when, for example, the owners have gone on vacation, or office space for the weekend or holidays is left without employees. The values of the "standby" temperature are selected from the conditions of energy saving (coolants) and in order not to malfunction the system units with a low negative outside temperature, for example, the "standby" temperature of the water in the boiler can be set to +30 ^o C, and the air in the room to +8 ^o C.

 The "standby" mode is set by simultaneously pressing the "<" and ">" buttons on the BZR6, after holding them for 2 seconds, the set value of the "standby" water temperature (when the "Water" LED on the BIR7 is lit) or air (when LED “Air”), on the BIR7 the “Standby mode” LED also lights up. After releasing the buttons, the current value of water or air is displayed on the BCI8. The glow of the “Air” or “Water” LED on the BIR7 in this mode depends on what mode was before the “standby”, i.e. "Air" or "Water."

 The task of the thermal regime is determined by the values of "standby" temperatures, and the algorithm of the device is the same as in the modes "Water" and "Air". The “standby” mode is canceled by repeated simultaneous pressing of the "<" and ">" buttons on the BZR6, after which the "Standby mode" LED on the BIR7 goes out.

 If the circuit of any of the digital thermometers is broken, the device gives an intermittent sound signal to the BZS5 (sound output MP1), because In this case, the digital thermometer enters the high output impedance mode, which is recorded by the MP1 input devices.

The use of this programmable thermostat allows to obtain high performance, namely:
variability to the type of setting temperatures (for water, air, standby);
the ability to work with long lines (up to 100 meters or more) from a digital thermometer to a temperature controller;
the possibility of increasing digital thermometers to ten or more;
high accuracy characteristics and low GMC due to circuit design.

Claims (1)

 A program temperature controller containing a power supply unit, a microprocessor and a power unit, microprocessor relay outputs are connected to a power unit, the outputs of which are thermostat outputs, characterized in that the first and second digital thermometers, non-volatile storage device, an audio signaling unit, a mode setting unit are inserted into it , a mode indication unit and a digital indication unit, wherein the outputs of the first and second digital thermometers are connected to the first and second information inputs of the microprocessor, respectively Naturally, the information output of the mode setting unit — with the third information input of the microprocessor and the information input of the mode display unit, the gate output of the mode setting unit is connected to the enable input of the digital display unit, the indicator output of the microprocessor is connected to the control inputs of the mode display unit and the digital display unit, and the microprocessor is connected by a bi-directional address and data bus with a non-volatile storage device, the clock output of the microprocessor is connected by a sync input non-volatile storage device, the control output of the power supply is connected to the input of zeroing the microprocessor, the sound output of the microprocessor is connected to the sound alarm unit.