CN111294988B - Safe and reliable long-life high-power constant-temperature heating controller - Google Patents
Safe and reliable long-life high-power constant-temperature heating controller Download PDFInfo
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Abstract
The invention relates to a safe, reliable, long-life and high-power constant-temperature heating controller, which is characterized in that: the relay set comprises a series relay set output circuit, a power zero detection circuit and a microcomputer processing circuit, wherein each relay set of the series relay set output circuit is composed of at least two relays which are connected in series, a control signal input end of the relay set is connected with a control signal output end of the microcomputer processing circuit, and the relay wheel circulation/interruption of the relay set is controlled through the microcomputer processing circuit to form a relay set on/off times multiplication circuit structure; the power supply zero point detection circuit detects the voltage of the alternating current power supply, the signal input end of the power supply zero point detection circuit is connected with the alternating current power supply, the signal output end of the power supply zero point detection circuit is connected with one of the signal input ends of the microcomputer processing circuit, and the microcomputer processing circuit detects a voltage zero point signal input by the one of the signal input ends; and a power supply zero signal input and protection circuit structure is formed. It has the advantages of safety, reliability, small volume, multiple extension of electric on/off times, long service life, etc.
Description
Technical Field
The invention relates to a safe, reliable, long-life and high-power constant-temperature heating controller which is suitable for large-area and high-power constant-temperature heating scenes, such as livestock and poultry farms including pigs and chickens or places where snow needs to be melted, such as houses and roads. Belongs to the technical field of constant temperature heating control.
Background
At present, with the development of human society, the breeding scale of livestock and poultry such as pigs and chickens is larger and larger, and the requirement on the breeding efficiency is higher and higher, so that the constant-temperature conservation of newborn cubs is indispensable, and large-area high-power constant-temperature heating and warm keeping are required. In winter, snow on roads and roofs brings inconvenience and potential safety hazards to life of people in places with low temperature, and large-area high-power constant-temperature heating is also needed in the places. The heating power of the large-area high-power constant-temperature heating is usually required to be several kilowatts to several tens of kilowatts (the current generally exceeds 10 amperes); and in order to keep the temperature constant, frequent power on/off is required to adjust the heating power.
In the prior art, the high power amplifiers with load current exceeding 10A can be roughly classified into the following three types: electronic amplifiers, relays, and contactors. Electronic amplifiers are characterized in that the times of on/off of electricity are almost not limited, but have the defects of large self-heat release, temperature rise, easy damage and the like; especially, when the current value is more than 10 amperes, a cooling measure is required, otherwise the current value is damaged due to overhigh temperature, the size of the cooling facility is increased, the installation environment is also required, and potential safety hazards exist because the current value cannot be judged when the temperature of the facility is overhigh. Contactors are characterized by strong load capacity and good temperature characteristics, but have the defects of large volume, large working noise, small electricity on/off times, short service life and the like. The relays have the advantages of good temperature characteristics, small self-heating quantity, small volume and low working noise, but have the defects of limited on/off times of electricity (usually tens of thousands to tens of thousands), large influence of current impact on contacts and the like.
Disclosure of Invention
The invention aims to solve the problems of limited relay on/off times, large current impact influence on contacts and the like of a relay high-power amplifier in the prior art, and provides a safe and reliable high-power constant-temperature heating controller with long service life, which has the outstanding substantive characteristics of safety, reliability, small volume, multiplied electric on/off times, long service life and the like and remarkable technical progress.
The purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides a safe and reliable high-power constant temperature heating controller of long-life which structural feature lies in: the power supply zero detection circuit comprises a series relay set output circuit, a power supply zero detection circuit and a microcomputer processing circuit, wherein the series relay set output circuit is provided with a signal output end; each relay group of the series relay group output circuit is composed of at least two relays which are connected in series, the control signal input end of the relay group is connected with the control signal output end of the microcomputer processing circuit, and the relay wheel circulation/interruption of the relay group is controlled by the microcomputer processing circuit to form a relay group on/off frequency multiplication circuit structure; the power supply zero point detection circuit detects the voltage of the alternating current power supply, the signal input end of the power supply zero point detection circuit is connected with the alternating current power supply, the signal output end of the power supply zero point detection circuit is connected with one of the signal input ends of the microcomputer processing circuit, and the microcomputer processing circuit outputs a control signal to switch on or off the series relay set by detecting a voltage zero point signal input by one of the signal input ends so as to enable the power heating component to heat or stop heating; and a power supply zero signal input and protection circuit structure is formed.
In practical application, the microcomputer processing circuit judges whether the alternating current power supply voltage is a zero crossing point or a non-zero crossing point according to a signal input from the power supply zero point detection circuit, outputs a control signal to disconnect the series relay set when the alternating current power supply voltage is judged to be the zero crossing point, so that the power heating component stops heating, and outputs the control signal to keep the series relay set in a power-on state when the alternating current power supply voltage is judged to be the non-zero crossing point, so that the power heating component continues heating, and the impact of large current on a relay contact is avoided.
The purpose of the invention can be achieved by adopting the following technical scheme:
furthermore, the microcomputer processing circuit is provided with a second signal input end, the second signal input end is connected with a load current real-time detection circuit, the signal input end of the load current real-time detection circuit is connected with an alternating current power supply for supplying power to the power heating component so as to detect the working current of the power heating component in real time, and the signal output end of the load current real-time detection circuit is connected with the second signal input end of the microcomputer processing circuit so as to input a real-time detection current signal; when the power supply needs to be cut off to stop heating, after the microcomputer processing circuit judges that the alternating current power supply voltage is zero, the microcomputer processing circuit continues to track and receive the real-time detection current signal of 0, and then the microcomputer processing circuit outputs a control signal to cut off the relay set series connection output circuit to stop heating, so that damage to the relay set caused by induced electromotive force generated by a load due to sudden circuit cutting is avoided, and the on-off service life of heating control is prolonged.
In practical application, when the microcomputer processing circuit judges that the signal output of the load current real-time detection circuit is zero, the output control signal is connected with the output circuit of the series relay set and the power heating component to start heating, so that the impact of large current on a relay contact at the moment of load electrification is avoided; forming a power supply zero signal input and power-on protection circuit structure; the signal input end of the load current real-time detection circuit is connected with an alternating current power supply for supplying power to the power heating component to detect the working current of the power heating component in real time, and the signal output end of the load current real-time detection circuit is connected with the second signal input end of the microcomputer processing circuit to input a real-time detection current signal; when the power supply needs to be cut off and the heating is stopped, when the microcomputer processing circuit receives a real-time detection current signal of 0, the microcomputer processing circuit outputs a control signal to cut off the output circuit of the series relay set to stop heating, so that damage to the relay set caused by induced electromotive force generated by a load due to sudden circuit cutting is avoided, and the on-off service life of heating control is prolonged; and a load current zero signal input and power-off protection circuit structure is formed.
Furthermore, the microcomputer processing circuit is provided with a third signal input end, the third signal input end is connected with a man-machine setting circuit, and the man-machine setting circuit comprises an external temperature sensor and a man-machine setting interface to form a constant-temperature closed-loop control circuit.
Furthermore, the output circuit of the series relay group is provided with one group or three groups of series relay groups so as to correspondingly control the single-phase or three-phase high-power constant-temperature heating structure.
Furthermore, the power zero detection circuit is composed of a voltage transformer or a photoelectric isolation circuit.
Furthermore, the load current real-time detection circuit is composed of a current transformer.
Furthermore, the microcomputer processing circuit is composed of a single chip MCU containing an AD converter and a comparator.
The invention has the following outstanding advantages:
1. the invention comprises a series relay set output circuit, a power zero detection circuit and a microcomputer processing circuit, wherein the series relay set output circuit is provided with a signal output end; each relay group of the series relay group output circuit is composed of at least two relays which are connected in series, the control signal input end of the relay group is connected with the control signal output end of the microcomputer processing circuit, and the relay wheel circulation/interruption of the relay group is controlled by the microcomputer processing circuit to form a relay group on/off frequency multiplication circuit structure; the power supply zero detection circuit detects the voltage of the alternating current power supply, the signal input end of the power supply zero detection circuit is connected with the alternating current power supply, the signal output end of the power supply zero detection circuit is connected with one of the signal input ends of the microcomputer processing circuit, and the microcomputer processing circuit outputs a control signal to switch on or off the series relay group by detecting a voltage zero signal input by one of the signal input ends so as to enable the power heating component to heat or stop heating; and a power supply zero signal input and protection circuit structure is formed. Therefore, the problems that the relay on/off times of the relay are limited, the contact is greatly influenced by current impact and the like in the relay high-power amplifier in the prior art can be solved, and the relay high-power amplifier has the prominent substantive characteristics of safety, reliability, small volume, doubled extension of the on/off times, long service life and the like and remarkable technical progress.
2. Because the invention adopts the power zero point detection circuit, when the heating is needed, the microcomputer processing circuit outputs the control signal to open the output circuit of the series relay set to start the power-on heating when detecting the power zero point, thus the current at the moment of switching on the heater is 0, the damage of the large current to the relay contact is avoided, and the service life of the on-off heating is prolonged.
3. Because the invention adopts the current real-time detection circuit, when the heating is required to be cut off, the microcomputer processing circuit detects that the heating current is 0, and then cancels the control signal to cut off the output circuit of the series relay set to stop heating, thus the current flowing through the output circuit of the series relay set is 0 when the heating is cut off, the damage to the relay set caused by the induced electromotive force generated by the load when the circuit is cut off suddenly is avoided, and the service life of controlling the heating on/off is further prolonged.
4. The invention adopts the output circuit of the series relay group, a plurality of relays are connected in series to form a group to control one path of heating, when the heating is stopped, any relay in the group is switched off, and the states of other relays are not changed, thus the on-off service life of the heating output is controlled to be the minimum value of the on-off service life of all relays in the group multiplied by the number of the group of relays, and the on-off service life of the heating is greatly prolonged. Because the output circuit of the series relay set and the current real-time detection circuit are adopted, when the microcomputer detects that the current of the heating circuit is larger than the maximum value allowed by the relay series circuit, the microcomputer cuts off the control signal of the output circuit of the series relay set in time (less than 1 second) to cut off the heating circuit, thereby avoiding potential safety hazard; meanwhile, because the relay group is adopted to be output in series, the probability of simultaneously burning a plurality of relay contacts in a very short time (less than 1 second) before the microcomputer has come to cut off the control signal is far lower than the probability of burning one relay contact, and the safety is further greatly improved.
Drawings
Fig. 1 is a circuit block diagram of embodiment 1 of the present invention.
Wherein, the output circuit of the 1-series relay group, one of the 1-1 series relay groups, two of the 1-2 series relay groups, and three of the 1-3 series relay groups; 2-a power supply zero point detection circuit; 3-a microcomputer processing circuit; 3-1-one of the signal inputs of the microcomputer processing circuit; 3-2-the second signal input terminal of the microcomputer processing circuit; 3-3 the third signal input terminal of the microcomputer processing circuit; 3-4-one of the control signal output terminals of the microcomputer processing circuit, 3-5-two of the control signal output terminals of the microcomputer processing circuit, and 3-6-three of the control signal output terminals of the microcomputer processing circuit; 4-a load current real-time detection circuit; 5-setting a circuit by a man-machine; 6-heating load, one of 6-1-heating load, two of 6-2-heating load, and three of 6-3-heating load; jd 1-one of the relays, jd 2-two of the relays, jd 3-three of the relays, jd 4-four of the relays, jd 5-five of the relays, and Jd 6-six of the relays; vt 1-one of the voltage transformers; vt 2-two potential transformers; a third Vt3 potential transformer; it 1-one of the current transformers; it 2-the second current transformer; it3, a third current transformer; rt1 — one of the external temperature sensors; rt 2-the second external temperature sensor; rt 3. Third external temperature sensor.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
specific example 1:
referring to fig. 1, the present embodiment includes a series relay group output circuit 1, a power zero detection circuit 2, and a microcomputer processing circuit 3, where the series relay group output circuit 1 has a signal output end; each group of relay group of the series relay group output circuit 1 is composed of at least two relays which are connected in series, the control signal input end of the relay group is connected with the control signal output end of the microcomputer processing circuit 3, and the circulation/interruption of the relay wheel of the relay group is controlled by the microcomputer processing circuit 3, so that a relay group on/off frequency multiplication circuit structure is formed; the power zero detection circuit 2 detects the voltage of the alternating current power supply, the signal input end of the power zero detection circuit 2 is connected with the alternating current power supply, the signal output end is connected with one of the signal input ends of the microcomputer processing circuit 3, and the microcomputer processing circuit 3 outputs a control signal to switch on or off the series relay set by detecting a voltage zero signal input by one of the signal input ends, so that the power heating component heats or stops heating; and a power supply zero signal input and protection circuit structure is formed.
In this embodiment:
the output circuit 1 of the series relay group is provided with three groups of series relay groups so as to correspondingly control a three-phase high-power constant-temperature heating structure.
The microcomputer processing circuit 3 has two signal input ends 3-2, the two signal input ends 3-2 are connected with a load current real-time detection circuit 4, the signal input end of the load current real-time detection circuit 4 is connected with an alternating current power supply for supplying power to the power heating component so as to detect the load working current in real time, and the signal output end of the load current real-time detection circuit 4 is connected with the two signal input ends 3-2 of the microcomputer processing circuit 3 so as to input a real-time detection current signal; when the power supply needs to be cut off to stop heating, after the microcomputer processing circuit 3 judges that the alternating current power supply voltage is zero, the real-time detection current signal is continuously tracked and received and is 0, and then the control signal is output to cut off the relay set series connection output circuit to stop heating, so that damage to the relay set caused by induced electromotive force generated by a load due to sudden circuit cutting is avoided, and the on-off service life of control heating is further prolonged. The microcomputer processing circuit 3 is provided with a third signal input end 3-3, the third signal input end 3-3 is connected with a man-machine setting circuit 5, and the man-machine setting circuit 5 comprises an external temperature sensor and a man-machine setting interface 5-1 to form a constant-temperature closed-loop control circuit. The external temperature sensor comprises a first external temperature sensor Rt1, a second external temperature sensor Rt2 and a third external temperature sensor Rt3, signal output ends of the first external temperature sensor Rt1, the second external temperature sensor Rt2 and the third external temperature sensor Rt3 and an output end of a man-machine setting interface 5-1 are connected with a third signal input end 3-3 of the microcomputer processing circuit 3 through an output end 5-2 of the man-machine setting circuit 5.
The output circuit 1 of the series relay group is provided with three groups of series relay groups so as to correspondingly control a single-phase or three-phase high-power constant-temperature heating structure. The three groups of series relays comprise one of the series relays 1-1, two of the series relays 1-2 and three of the series relays 1-3, wherein one of the series relays 1-1 is formed by connecting one of the relays Jd1 and two of the relays Jd2 in series, two of the series relays 1-2 is formed by connecting three of the relays Jd3 and four of the relays Jd4 in series, and three of the series relays 1-3 is formed by connecting five of the relays Jd5 and six of the relays Jd6 in series; the three-phase high-power constant-temperature heating structure is a heating load 6 connected in three-phase alternating current and comprises one heating load 6-1, two heating loads 6-2 and three heating loads 6-3, wherein the one heating load 6-1 is connected to the phase A of a three-phase alternating current power supply, the two heating loads 6-2 and the three heating loads 6-3 are respectively connected to the phase B and the phase C of the three-phase alternating current power supply, and power input ends of the one heating load 6-1, the two heating loads 6-2 and the three heating loads 6-3 are respectively connected with the phase A, the phase B and the phase C of the three-phase alternating current power supply through one series relay group 1-1, the two series relay groups 1-2 and the three series relay groups 1-3.
The power supply zero point detection circuit 2 is composed of three voltage transformers, the three voltage transformers can comprise one voltage transformer Vt1, two voltage transformers Vt2 and three voltage transformers Vt3, the one voltage transformer Vt1, the two voltage transformers Vt2 and the three voltage transformers Vt3 are respectively connected to A, B, C phases of a three-phase alternating current power supply, and signal output ends of the three voltage transformers are respectively connected with one signal input end of the microcomputer processing circuit 3.
One Vt1 of the voltage transformers in the power supply zero point detection circuit 2 senses the voltage between a live wire A and a zero wire of an input power supply, the other Vt2 of the voltage transformers senses the voltage between a live wire B and a zero wire of the input power supply, the third Vt3 of the voltage transformers senses the voltage between a live wire C and a zero wire of the input power supply, output signals of the voltage transformers are transmitted to corresponding signal input ends of a micro computer chip MCU through a signal output end of the power supply zero point detection circuit 2, the MCU is provided with an AD converter, and the AD converter converts received voltage detection analog signals into digital signals to enter a central processing unit of the MCU for processing.
The microcomputer processing circuit 3 is composed of a microcomputer chip MCU integrated with a plurality of AD converters, a plurality of input I/O ports and a plurality of output I/O ports; the 1 st, 2 nd and 3 rd AD converters of the MCU chip form one 3-1 of the signal input ends of the microcomputer processing circuit, the 4 th, 5 th and 6 th AD converters of the MCU chip form two 3-2 of the signal input ends of the microcomputer processing circuit 3, the 7 th, 8 th and 9 th AD converters and a plurality of input I/O ports of the MCU chip form three 3-3 of the signal input ends of the microcomputer processing circuit, and the 1 st, 2 nd, 3 rd, 4 th, 5 th and 6 th output I/O ports of the MCU chip form one 3-4, two 3-5 and three 3-6 of the control signal output ends of the microcomputer processing circuit 3.
The microcomputer processing circuit 3 is provided with a third signal input end, the third signal input end is connected with a man-machine setting circuit (5), and the man-machine setting circuit (5) comprises an external temperature sensor and a man-machine setting interface (5-1) to form a constant-temperature closed-loop control circuit. The load current real-time detection circuit 4 is composed of three current transformers, the three current transformers can comprise one current transformer It1, two current transformers It12 and three current transformers It3, the one current transformer It1, the two current transformers It12 and the three current transformers It3 are respectively connected to A, B, C phases of a three-phase alternating current power supply, and signal output ends of the three current transformers are respectively connected with one signal input end of the microcomputer processing circuit 3.
The three current transformers can respectively sense real-time currents of three loads, wherein one It1 of the current transformers senses and heats the current in a live wire A of one 6-1 of the loads, two It2 of the current transformers senses and heats the current in a live wire B of two 6-2 of the loads, three It3 of the current transformers senses and heats the current in a live wire C of three 6-3 of the loads, output signals of the current transformers are transmitted to corresponding signal input ends of a micro-computer chip MCU through a signal output end of a load current real-time detection circuit 4, the MCU is provided with an AD converter, and the AD converter converts received load current real-time detection analog signals into digital signals to enter a central processing unit of the MCU for processing.
The human-computer setting circuit 5 comprises an external temperature sensor and a human-computer setting interface 5-1, wherein the external temperature sensor comprises one Rt1 of the external temperature sensor, two Rt2 of the external temperature sensor and three Rt3 of the external temperature sensor; one Rt1 of the external temperature sensors detects the real-time temperature of one 6-1 of the heating loads, the two Rt2 of the external temperature sensors detects the real-time temperature of the two 6-2 of the heating loads, the three Rt3 of the external temperature sensors detects the real-time temperature of the three 6-3 of the heating loads, output signals of the three external temperature sensors and output signals of a man-machine setting interface 5-1 are connected to the third signal input end of a microcomputer processing circuit consisting of a 7 th path A/D converter, an 8 th path A/D converter and a 9 th path I/O ports of a microcomputer chip MCU, wherein the signal of the one Rt1 of the external temperature sensors is connected with the 7 th path A/D converter of the microcomputer chip MCU, the signal of the two Rt2 of the external temperature sensors is connected with the 8 th path A/D converter of the microcomputer MCU, the signal of the three Rt3 of the external temperature sensors is connected with the 9 th path A/D converter of the microcomputer MCU, and the signal of the man-machine setting interface 5-1 is connected with the input I/O ports of the microcomputer.
The working principle of the present invention is illustrated below by taking one of the heating loads 6-1 in the present embodiment as an example:
a user sets a target temperature value TA and a maximum current value IA of one heating load 6-1, a target temperature value TB and a maximum current value IB of the other heating load 6-2, and a target temperature value TC and a maximum current value IC of the other heating load 6-3 through a man-machine setting interface 5-1.
First on-off control of one of the heating loads 6-1: when the real-time temperature of one of the heating loads 6-1 detected by one of the external sensors Rt1 is collected and analyzed by the microcomputer MCU and is smaller than a target temperature value TA for the first time, the microcomputer MCU captures a zero point of a live wire A of the external power supply 6 by collecting and analyzing a signal of one of the voltage transformers Vt1, controls the simultaneous connection of the one of the relays Jd1 and the two relays Jd2 at the zero point moment, the live wire A of the external power supply 7 is connected to the live wire output A of the one of the heating loads 6-1 through the one of the series relay groups 1-1 at the moment, the one of the heating loads 6-1 starts heating and starts heating, when the real-time temperature of the one of the heating loads 6-1 detected by the one of the external sensors Rt1 is collected and analyzed by the microcomputer MCU and is higher than the target temperature value TA, the microcomputer MCU captures a zero point current of the one of the heating loads 6-1 through collecting and analyzing a signal of the one of the current transformers and controls the one of the relays Jd1 to be disconnected at the zero point moment, the two relays Jd2 are still in a connected to the state, and the live wire A connected to the one of the heating loads 6-1 through the one of the series relay group 1 is disconnected, and stops heating loads and starts heating loads and stops heating and cools down;
second on-off control of one of the heating loads 6-1: when the real-time temperature of one of the heating loads 6-1 detected by one of the external sensors Rt1 is acquired and analyzed by the microcomputer MCU and is smaller than the target temperature value TA for the second time, the microcomputer MCU captures the zero point of the live wire A of the external power supply 7 by acquiring and analyzing the signal of one of the voltage transformers Vt1 and controls to switch on one of the relays Jd1 at the zero point moment, because the two relays Jd2 are still in the on state, the live wire A of the external power supply 7 is switched on to the live wire output A of the one of the heating loads 6-1 through one of the series relay sets 1-1 at the moment, one of the heating loads 6-1 starts to heat and starts to heat up, when the real-time temperature of the one of the heating loads 6-1 detected by the one of the external sensors Rt1 is higher than the target temperature value TA, the microcomputer MCU captures the current zero point of the one of the heating loads 6-1 by acquiring and analyzing the signal of the one of the current transformers It1 and controls the two relays Jd2 to be switched off at the zero point moment, the state of the one relay Jd1 is still in the on state, and the two relays stop heating loads and start to cool down and start to heat the one relay 2 of the one relay set when the live wire is connected through one relay set 1;
third on-off control of one of the heating loads 6-1: when the real-time temperature of one of the heating loads 6-1 detected by one of the external sensors Rt1 is acquired and analyzed by the microcomputer MCU and is less than the target temperature value TA for the third time, the microcomputer MCU captures the zero point of the live wire A of the external power supply 7 by acquiring and analyzing the signal of one of the voltage transformers Vt1 and controls to switch on the two Jd2 relays at the zero point moment, because the one Jd1 of the relays is still in the on state, the live wire A of the external power supply 7 is switched on to the live wire output A of the one of the heating loads 6-1 through one of the series relay sets 1-1 at the moment, the one 6-1 of the heating loads starts to heat and starts to heat up, when the real-time temperature of the one 6-1 of the heating loads detected by the one of the external sensors Rt1 is higher than the target temperature value TA, the microcomputer MCU captures the current zero point of the one of the heating loads 6-1 by acquiring and analyzing the signal of the one of the current transformers and controls to switch off the one Jd1 of the relays at the zero point moment, the two Jd2 of the relays are still in the on state, and the one Jd1 of the relays stops heating loads and starts to cool down and starts to heat the one relay set 6-1 of the one relays;
and sequentially and circularly executing the second on-off control action and the third on-off control action of one of the heating loads 6-1, namely, sequentially and circularly cutting off the two relays Jd2 and the one relay Jd1 to control the one of the heating loads 6-1 to stop heating, so that the real-time temperature of the one of the heating loads 6-1 is close to a target temperature value TA.
When the live wire A of the external power supply 7 is connected to the live wire output A of one 6-1 of the heating loads through one 1-1 of the series relay groups, one 6-1 of the heating loads starts to heat and starts to heat, if the microcomputer MCU collects and analyzes an It1 signal of one current transformer in real time to calculate that the real-time current value of one 6-1 of the heating loads is larger than the set maximum current value IA, the microcomputer MCU immediately disconnects all relays in one 1-1 of the series relay groups to stop heating one 6-1 of the heating loads to continue heating, and potential safety hazards are avoided.
When the microcomputer MCU outputs a control signal to cut off one of the relays Jd1 to stop heating one of the heating loads 6-1, if the microcomputer MCU collects and analyzes an It1 signal of the current transformer in real time to calculate the real-time current value of one of the heating loads 6-1 to be not zero, the contact of one of the relays Jd1 is judged to be burnt and can not be released, and at the moment, the microcomputer MCU stops heating one of the heating loads 6-1 by cutting off two relays Jd2 to avoid potential safety hazards; when the microcomputer MCU outputs a control signal to cut off the two Jd2 relays to stop heating one 6-1 of the heating loads, if the microcomputer MCU collects and analyzes an It1 signal of the current transformer in real time to calculate that the real-time current value of the one 6-1 of the heating loads is not zero, the contact of the two Jd2 relays is judged to be burnt and can not be released, and at the moment, the microcomputer MCU stops heating the one 6-1 of the heating loads to continue heating by cutting off the one Jd1 of the relays to avoid potential safety hazards.
From the working principle, it can be seen that: because each on/off of one 1-1 of the series relay groups is realized by one Jd1 of the round on/off relays and two Jd2 of the relays, the on/off control life of one 6-1 of the heating load is equal to the minimum value of the on/off life of the relay in one 1-1 of the series relay groups multiplied by 2 and is far longer than the on/off life of any relay in the group, and the on/off control life of the controller to one 6-1 of the heating load is greatly prolonged; because the relay is switched on at the voltage zero point every time, the switching-on current is almost 0, the switching-on service life of each relay is close to the theoretical maximum value, and the on/off control service life of the controller for one of the heating loads, namely 6-1, is further prolonged; because the relay is switched off at the current zero point each time, the induced electromotive heat generated by one of the heating loads 6-1 is the minimum, and the switching-off current borne by the relay contact is the minimum, the switching-off service life of each relay is closest to the theoretical maximum value, and the on/off control service life of the controller on one of the heating loads 6-1 is further prolonged; when any contact of the first Jd1 of the relays and the second Jd2 of the relays is burned to be dead and can not be released, the microcomputer MCU can judge and stop heating, and potential safety hazards are avoided, because the probability that the first Jd1 contact of the relays and the second Jd2 contact of the relays are simultaneously burned to be dead and can not be released is far smaller than the probability that the first Jd1 contact of the relays or the second Jd2 contact of the relays are burned to be dead and can not be released, the safety is greatly improved.
Similarly, the control of the second 6-2 heating load and the third 6-3 heating load can be performed by referring to the control of the first 6-1 heating load.
Specific example 2:
the specific embodiment 2 of the invention is characterized in that: each relay group of the series relay group output circuit 1 is formed by connecting three, four, five or more than six relays in series. The rest is the same as in embodiment 1.
Specific example 3:
the specific embodiment 3 of the present invention is characterized in that: the output circuit 1 of the series relay group is provided with a group of series relay groups so as to correspondingly control a single-phase high-power constant-temperature heating structure. The rest is the same as embodiment 1 or embodiment 2.
Specific example 4:
the specific embodiment 4 of the present invention is characterized in that: the load current real-time detection circuit 4 is omitted from embodiment 1. The rest is the same as in embodiment 1.
Claims (7)
1. The utility model provides a safe and reliable high-power constant temperature heating controller of long-life which characterized in that: the system comprises a series relay set output circuit (1), a power zero detection circuit (2) and a microcomputer processing circuit (3), wherein the series relay set output circuit (1) is provided with a signal output end; each relay group of the series relay group output circuit (1) is formed by connecting at least two relays in series, the control signal input end of the relay group is connected with the control signal output end of the microcomputer processing circuit (3), and the relay wheel circulation/interruption of the relay group is controlled by the microcomputer processing circuit (3) to form a relay group on/off frequency multiplication circuit structure; the power supply zero point detection circuit (2) detects the voltage of an alternating current power supply, the signal input end of the power supply zero point detection circuit (2) is connected with the alternating current power supply, the signal output end of the power supply zero point detection circuit is connected with one of the signal input ends of the microcomputer processing circuit (3), and the microcomputer processing circuit (3) outputs a control signal to switch on or off the series relay group by detecting a voltage zero point signal input by one of the signal input ends so as to enable the power heating component to heat or stop heating; and a power supply zero signal input and protection circuit structure is formed.
2. A safe, reliable, long-life, high-power thermostatic heating controller as set forth in claim 1, wherein: the microcomputer processing circuit (3) is provided with a second signal input end, the second signal input end is connected with a load current real-time detection circuit (4), the signal input end of the load current real-time detection circuit (4) is connected with an alternating current power supply for supplying power to the power heating component to detect the working current of the power heating component in real time, and the signal output end of the load current real-time detection circuit (4) is connected with the second signal input end of the microcomputer processing circuit (3) to input a real-time detection current signal; when the power supply needs to be cut off to stop heating, after the microcomputer processing circuit (3) judges that the alternating current power supply voltage is at a zero point, the real-time detection current signal is continuously tracked and received and is 0, the control signal is output to cut off the relay set series output circuit to stop heating, damage to the relay set caused by induced electromotive force generated by a load due to sudden circuit cutting is avoided, and the on-off service life of control heating is prolonged.
3. A safe, reliable, long-life, high-power thermostatic heating controller according to claim 1 or 2, wherein: the microcomputer processing circuit (3) is provided with a third signal input end, the third signal input end is connected with a man-machine setting circuit (5), and the man-machine setting circuit (5) comprises an external temperature sensor and a man-machine setting interface (5-1) to form a constant-temperature closed-loop control circuit.
4. A safe, reliable, long-life, high-power thermostatic heating controller according to claim 1 or 2, wherein: the output circuit (1) of the series relay group is provided with one group or three groups of series relay groups so as to correspondingly control a single-phase or three-phase high-power constant-temperature heating structure.
5. A safe, reliable, long-life, high-power thermostatic heating controller according to claim 1 or 2, wherein: the power supply zero point detection circuit (2) is composed of a voltage transformer or a photoelectric isolation circuit.
6. A safe, reliable, long-life, high-power thermostatic heating controller as set forth in claim 2, wherein: the load current real-time detection circuit (4) is composed of a current transformer.
7. A safe, reliable, long-life, high-power thermostatic heating controller according to claim 1 or 2, wherein: the microcomputer processing circuit (3) is composed of a single chip MCU containing an AD converter and a comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010184980.0A CN111294988B (en) | 2020-03-17 | 2020-03-17 | Safe and reliable long-life high-power constant-temperature heating controller |
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| CN202010184980.0A CN111294988B (en) | 2020-03-17 | 2020-03-17 | Safe and reliable long-life high-power constant-temperature heating controller |
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| CN111294988A CN111294988A (en) | 2020-06-16 |
| CN111294988B true CN111294988B (en) | 2023-03-31 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203965858U (en) * | 2014-06-05 | 2014-11-26 | 武汉市农业机械化科学研究所 | A kind of greenhouse actuator controller |
| CN106208672B (en) * | 2015-05-05 | 2019-07-16 | 佛山市顺德区美的电热电器制造有限公司 | Power control circuit and heating device |
| CN108514343B (en) * | 2018-06-20 | 2024-07-09 | 佛山市艾美皓电子科技有限公司 | Double-protection temperature control circuit and air fryer |
| CN212137940U (en) * | 2020-03-17 | 2020-12-11 | 佛山乔光科技有限公司 | Constant temperature heating controller |
| CN215345096U (en) * | 2021-08-11 | 2021-12-28 | 珠海拓芯科技有限公司 | Electric heating control circuit, system and air conditioner |
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