阅读说明：本技术 一种可调触发板及其控制方法 (Adjustable trigger plate and control method thereof ) 是由 黄心沿 刘东明 龙会跃 闫海莲 谢成 刘刚 朱辉 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种可调触发板及其控制方法,此可调触发板具体包括电源单元和集成应用电路单元,集成应用电路单元的输入端与电源单元的输出端相连；电源单元包括直流稳压源电路和RC串并联电路,RC串并联电路包括可调电阻R01、电阻R02和电容C2,可调电阻R01的一端与直流稳压源电路的一输出端相连,可调电阻R01的另一端与电容C2的一端相连,电容C2的另一端则与直流稳压源电路的另一输出端相连,电阻R02的一端与可调电阻R01的另一端相连,另一端则与地相连；集成应用电路单元包括一路以上的集成应用电路,当集成应用电路为多路时,多路集成应用电路相互并联。本发明具有电压及输出电流可调、安全可靠、操作简便且易于实现等优点。(The invention discloses an adjustable trigger plate and a control method thereof, wherein the adjustable trigger plate body comprises a power supply unit and an integrated application circuit unit, and the input end of the integrated application circuit unit is connected with the output end of the power supply unit; the power supply unit comprises a direct current voltage-stabilizing source circuit and an RC series-parallel circuit, the RC series-parallel circuit comprises an adjustable resistor R01, a resistor R02 and a capacitor C2, one end of the adjustable resistor R01 is connected with one output end of the direct current voltage-stabilizing source circuit, the other end of the adjustable resistor R01 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other output end of the direct current voltage-stabilizing source circuit, one end of the resistor R02 is connected with the other end of the adjustable resistor R01, and the other end of the resistor R02 is connected with the ground; the integrated application circuit unit comprises more than one integrated application circuit, and when the integrated application circuits are in multiple paths, the multiple integrated application circuits are connected in parallel. The invention has the advantages of adjustable voltage and output current, safety, reliability, simple and convenient operation, easy realization and the like.)

1. An adjustable trigger board is characterized by comprising a power supply unit (1) and an integrated application circuit unit (2), wherein the input end of the integrated application circuit unit (2) is connected with the output end of the power supply unit (1); the power supply unit (1) comprises a direct-current voltage-stabilizing power supply circuit and an RC series-parallel circuit, the RC series-parallel circuit comprises an adjustable resistor R01, a resistor R02 and a capacitor C2, one end of the adjustable resistor R01 is connected with one output end of the direct-current voltage-stabilizing power supply circuit, the other end of the adjustable resistor R01 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other output end of the direct-current voltage-stabilizing power supply circuit, one end of the resistor R02 is connected with the other end of the adjustable resistor R01, and the other end of the resistor R02 is connected with the ground; the integrated application circuit unit (2) comprises more than one integrated application circuit (21), and when the integrated application circuits (21) are in multi-path, the multi-path integrated application circuits (21) are connected in parallel.

2. The adjustable trigger plate of claim 1, wherein the dc voltage regulator circuit comprises a voltage regulator diode VD1, a three-terminal voltage regulator block TS and a diode VD, wherein an anode of the VD1 is connected to an input anode, a cathode of the VD is connected to an input terminal of the three-terminal voltage regulator block TS, an output terminal of the three-terminal voltage regulator block TS is connected to one end of an adjustable resistor R01, and a middle terminal of the three-terminal voltage regulator block TS is connected to one end of a resistor R02.

3. The adjustable trigger plate according to claim 2, characterized by further comprising a diode VD, capacitors C1 and C3, wherein the anode of the diode VD is connected with the other end of the adjustable resistor R01, and the cathode of the diode VD is connected with the output end of the three-terminal voltage stabilizing block TS; one end of the capacitor C1 is connected with the negative electrode of the voltage stabilizing diode VD1, the other end of the capacitor C3 is connected with the output end of the three-terminal voltage stabilizing block TS, and the other end of the capacitor C1 is connected with the input negative electrode.

4. The adjustable trigger plate according to claim 1, 2 or 3, wherein the integrated application circuit (21) comprises a waveform generator (211), a voltage follower (212), a differential proportion operation circuit (213), a voltage comparison circuit (214) and an optical coupling isolation output circuit (215) which are connected in sequence.

5. The adjustable trigger plate of claim 4, wherein the waveform generator (211) comprises a hysteresis comparator OP1, the non-inverting input terminal of the hysteresis comparator OP1 is connected to the output terminal of the power supply unit (1) via a resistor R011, the inverting input terminal of the hysteresis comparator OP1 is connected to the output terminal of the power supply unit (1) via a capacitor C4, the output terminal of the hysteresis comparator OP1 is connected to the inverting input terminal thereof via resistors R013 and R014 in turn, and the non-inverting input terminal of the hysteresis comparator OP1 is connected to the output terminal of the hysteresis comparator OP1 via R012 and R013 in turn; the non-inverting input of the voltage follower (212) is connected to the inverting input of the hysteresis comparator OP 1.

6. The adjustable trigger plate of claim 5, wherein the differential proportional operational circuit (213) comprises an operational amplifier OP3, resistors R14, R15, R021, R022, R024, R025 and a potentiometer R023, wherein a non-inverting input terminal of the operational amplifier OP3 is connected to the negative output terminal of the power supply unit (1) through the resistors R021 and R024 in sequence, a connection point of the resistors R021 and R024 is connected to one terminal of the potentiometer R023, the other terminal of the potentiometer R023 is connected to ground, an inverting input terminal of the operational amplifier OP3 is connected to one terminal of the resistor R022, the other terminal of the resistor R022 is connected to the positive output terminal of the power supply unit (1) through the resistor R14, the other terminal of the resistor R022 is connected to the negative output terminal of the power supply unit (1) through the resistor R15, and the inverting input terminal of the operational amplifier OP3 is connected to the output terminal of the operational amplifier OP3 through the resistor R025.

7. The adjustable trigger plate of claim 6, wherein the resistances of the resistors have a relationship of R021 ═ R022 and R024 ═ R025.

8. The adjustable trigger plate according to claim 7, wherein the voltage comparison circuit (214) comprises a voltage comparator OP4, the non-inverting input of the voltage comparator OP4 is connected to the output terminal of the operational amplifier OP3, the inverting input of the voltage comparator OP4 is connected to the output terminal of the voltage follower (212), and the output terminal of the voltage comparator OP4 is sequentially connected in series with a resistor R16 and a diode VD 2.

9. The adjustable trigger plate according to claim 8, wherein the optical coupling isolation output circuit (215) comprises an optical coupler, an input end of the optical coupler is connected with an output end of the voltage comparison circuit (214), an output end of the optical coupler is sequentially connected in series with a resistor R17 and a protection module, and the protection module is a fuse link.

10. The control method for the adjustable trigger plate based on any one of claims 1 to 9 is characterized by comprising the following steps:

firstly, a potentiometer R01 is adjusted to enable a power supply unit (1) to output a stable preset voltage meeting the requirements of an integrated application circuit unit (2);

when the load power is smaller than the preset power and only a single temperature zone is available, an independent working mode is adopted: the power supply unit (1) is connected in series with a single integrated application circuit (21);

when the load power is greater than the preset power and a plurality of temperature zones exist, a parallel working mode is adopted: after being connected in parallel, the integrated application circuits (21) are connected in series with the power supply unit (1).

Technical Field

The invention mainly relates to the technical field of semiconductor processing, in particular to an adjustable trigger plate and a control method thereof.

Background

Diffusion furnaces and CVD furnaces (Chemical Vapor Deposition, chinese full name Chemical Vapor Deposition) are core devices in semiconductor processing. In the process, a diffusion furnace is used for manufacturing PN junctions, a CVD furnace is a coating deposition device, is widely applied and is particularly suitable for occasions with high requirements on junction depth, film thickness and uniformity indexes. When the existing CVD furnace equipment and diffusion furnace equipment are used for adjusting power in production, the trigger plate controls the on-off and heating rate of the controllable silicon according to the required temperature. However, the current trigger plate has the following problems in application:

1. with the development of the technology, the length and the diameter of a furnace body are continuously increased, the power is increased, the existing trigger plate cannot meet the requirements, and the circuit is easily burnt out due to over-small supply voltage; the voltage of the existing power supply output end is fixed, and the size of the voltage cannot be changed under the condition that a power supply and a voltage stabilizing block are not changed, so that the limitation exists.

2. The voltage stabilizing block of the voltage stabilizing circuit of the existing trigger board is easy to burn out, and the selected voltage stabilizer is L7809. The reason is that the input voltage of the voltage stabilizing block is 24V, the output voltage is 9V, and the voltage difference on the voltage stabilizing block is 15V, which far exceeds the technical requirement that the voltage difference between the power supply voltage and the voltage stabilizing block is within the range of 3-7V.

3. In an application circuit of the existing trigger board in the market, a potentiometer is arranged and controls the current of a branch where a signal is located. In practical application, the potentiometer is directly grounded without other protection, and once damaged, the potentiometer is disconnected, so that the whole circuit cannot operate.

4. The output terminal adopts self-recovery fuse, has low circuit sensitivity, slow action time, fast aging time and easy leakage current, and is not easy to replace.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides an adjustable trigger plate which is adjustable in voltage, simple and convenient to operate and easy to realize, and a control method thereof.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

an adjustable trigger board comprises a power supply unit and an integrated application circuit unit, wherein the input end of the integrated application circuit unit is connected with the output end of the power supply unit; the power supply unit comprises a direct current voltage-stabilizing source circuit and an RC series-parallel circuit, the RC series-parallel circuit comprises an adjustable resistor R01, a resistor R02 and a capacitor C2, one end of the adjustable resistor R01 is connected with one output end of the direct current voltage-stabilizing source circuit, the other end of the adjustable resistor R01 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the other output end of the direct current voltage-stabilizing source circuit, one end of the resistor R02 is connected with the other end of the adjustable resistor R01, and the other end of the resistor R02 is connected with the ground; the integrated application circuit unit comprises more than one integrated application circuit, and when the integrated application circuits are in multiple paths, the multiple integrated application circuits are connected in parallel.

As a further improvement of the above technical solution:

the direct-current voltage-stabilizing power supply circuit comprises a voltage-stabilizing diode VD1, a three-terminal voltage-stabilizing block TS and a diode VD, wherein the anode of the VD1 is connected with the input anode, the cathode of the VD is connected with the input end of the three-terminal voltage-stabilizing block TS, the output end of the three-terminal voltage-stabilizing block TS is connected with one end of an adjustable resistor R01, and the middle end of the three-terminal voltage-stabilizing block TS is connected with one end of a resistor R02.

The diode VD is connected with the other end of the adjustable resistor R01 through the anode of the diode VD, and is connected with the output end of the three-terminal voltage stabilizing block TS through the cathode of the diode VD; one end of the capacitor C1 is connected with the negative electrode of the voltage stabilizing diode VD1, the other end of the capacitor C3 is connected with the output end of the three-terminal voltage stabilizing block TS, and the other end of the capacitor C1 is connected with the input negative electrode.

The integrated application circuit comprises a waveform generator, a voltage follower, a differential proportion operation circuit, a voltage comparison circuit and an optical coupling isolation output circuit which are sequentially connected.

The waveform generator comprises a hysteresis comparator OP1, wherein the non-inverting input end of the hysteresis comparator OP1 is connected with the output end of the power supply unit through a resistor R011, the inverting input end of the hysteresis comparator OP1 is connected with the output end of the power supply unit through a capacitor C4, the output end of the hysteresis comparator OP1 is connected with the inverting input end of the hysteresis comparator through resistors R013 and R014 in sequence, and the non-inverting input end of the hysteresis comparator OP1 is connected with the output end of the hysteresis comparator OP1 through R012 and R013 in sequence; the non-inverting input terminal of the voltage follower is connected to the inverting input terminal of the hysteresis comparator OP 1.

The differential proportion operation circuit comprises an operational amplifier OP3, resistors R14, R15, R021, R022, R024, R025 and a potentiometer R023, wherein the non-inverting input end of the operational amplifier OP3 is connected with the output cathode of the power supply unit through the resistors R021 and R024 in sequence, the connecting point of the resistors R021 and R024 is connected with one end of the potentiometer R023, the other end of the potentiometer R023 is connected with the ground, the inverting input end of the operational amplifier OP3 is connected with one end of the resistor R022, the other end of the resistor R022 is connected with the output anode of the power supply unit through a resistor R14, the other end of the resistor R022 is connected with the output cathode of the power supply unit through a resistor R15, and the inverting input end of the operational amplifier OP3 is connected with the output end of the operational amplifier OP3 through the resistor R025.

Wherein, the resistance relation of each resistor is R021 ═ R022, and R024 ═ R025.

The voltage comparison circuit comprises a voltage comparator OP4, wherein the non-inverting input end of the voltage comparator OP4 is connected with the output end of an operational amplifier OP3, the inverting input end of the voltage comparator OP4 is connected with the output end of a voltage follower, and the output end of the voltage comparator OP4 is sequentially connected with a resistor R16 and a diode VD2 in series.

The optical coupling isolation output circuit comprises an optical coupler, the input end of the optical coupler is connected with the output end of the voltage comparison circuit, the output end of the optical coupler is sequentially connected with a resistor R17 and a protection module in series, and the protection module is a fuse link.

The invention also discloses a control method based on the adjustable trigger plate, which comprises the following steps:

firstly, the potentiometer R01 is adjusted to enable the power supply unit to output stable preset voltage meeting the requirements of the integrated application circuit unit;

when the load power is smaller than the preset power and only a single temperature zone is available, an independent working mode is adopted: the power supply unit is connected with the single integrated application circuit in series;

when the load power is greater than the preset power and a plurality of temperature zones exist, a parallel working mode is adopted: after being connected in parallel, the integrated application circuits are connected in series with the power supply unit.

Compared with the prior art, the invention has the advantages that:

the invention adds the potentiometer variable resistance in the direct current voltage stabilization source circuit of the power supply unit to realize power supply adjustability, can provide voltages with different sizes, does not need to replace a power supply direct current source and a voltage stabilization block, has simple and convenient operation and is easy to realize.

Compared with the existing sawtooth wave generator which needs two operational amplifiers, the structure of the waveform generator only needs one hysteresis comparator OP1, and the structure is simple; the non-inverting input end of the voltage follower OP2 is connected with the inverting input end of the hysteresis comparator OP1, and the voltage follower OP2 plays roles of buffering and isolating, so that hidden dangers such as overlarge voltage, waveform distortion and the like are solved.

According to the differential proportional operation circuit, the resistor is incorporated into the potentiometer, so that the input of the potentiometer can be controlled more effectively, and the effect of current regulation is achieved; compared with the original design that the potentiometer is directly used, the protection circuit has the advantages that the protection effect is achieved, when only the potentiometer is damaged, the circuit is still conducted, and other components in the circuit cannot be damaged due to too large or too small resistance value.

In the optical coupling isolation output circuit, the fuse link is selected as the protection module, so that the cost is low, the sensitivity is high, and when the circuit breaks down, the accuracy of the protection circuit is higher compared with a gradually aged self-recovery fuse.

Drawings

Fig. 1 is a circuit schematic diagram of an embodiment of a power supply unit of the present invention.

FIG. 2 is a schematic circuit diagram of an integrated application circuit according to an embodiment of the present invention.

FIG. 3 is a circuit schematic of a waveform generator and voltage follower of the present invention in an embodiment.

FIG. 4 is a schematic circuit diagram of a differential scaling circuit according to an embodiment of the present invention.

FIG. 5 is a schematic circuit diagram of a voltage comparator circuit according to an embodiment of the present invention.

Fig. 6 is a circuit schematic diagram of an embodiment of an opto-isolator output circuit of the present invention.

FIG. 7 is a schematic block diagram of an embodiment of an adjustable strike plate of the present invention.

The reference numbers in the figures denote: 1. a power supply unit; 2. an integrated application circuit unit; 21. an integrated application circuit; 211. a waveform generator; 212. a voltage follower; 213. a differential proportional operation circuit; 214. a voltage comparison circuit; 215. and the optical coupling isolation output circuit.

Detailed Description

The invention is further described below with reference to the figures and the specific embodiments of the description.

As shown in fig. 7, the adjustable trigger plate of the present embodiment is suitable for an oxidation diffusion furnace, a CVD furnace, and other devices, and specifically includes a power supply unit 1 and an integrated application circuit unit 2, where an input terminal of the integrated application circuit unit 2 is connected to an output terminal of the power supply unit 1; the integrated application circuit unit 2 comprises more than one integrated application circuit 21, and when the integrated application circuits 21 are in multiple paths, the multiple integrated application circuits 21 are connected in parallel; the power supply unit 1 comprises a direct current voltage stabilizing power supply circuit and an RC series-parallel circuit; the direct current voltage-stabilizing source circuit comprises a voltage-stabilizing diode VD1, a three-terminal voltage-stabilizing block TS and a diode VD, wherein the anode of the VD1 is connected with the input anode, the cathode of the VD is connected with the input end of the three-terminal voltage-stabilizing block TS, the output end of the three-terminal voltage-stabilizing block TS is connected with one end of an adjustable resistor R01, and the middle end of the three-terminal voltage-stabilizing block TS is connected with one end of a resistor R02; the RC series-parallel circuit comprises an adjustable resistor R01, a resistor R02 and a capacitor C2, one end of the adjustable resistor R01 is connected with one output end of the direct-current voltage-stabilizing source circuit, the other end of the adjustable resistor R01 is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the other output end of the direct-current voltage-stabilizing source circuit, one end of the resistor R02 is connected with the other end of the adjustable resistor R01, and the other end of the resistor R02 is connected with the ground; the power supply unit 1 further comprises a diode VD, a capacitor C1 and a capacitor C3, wherein the anode of the diode VD is connected with the other end of the adjustable resistor R01, and the cathode of the diode VD is connected with the output end of the three-terminal voltage stabilizing block TS; one end of the capacitor C1 is connected with the cathode of the voltage stabilizing diode VD1, and the other end of the capacitor C1 is connected with the input cathode; one end of the capacitor C3 is connected with the output end of the three-terminal voltage stabilizing block TS, and the other end is connected with the input cathode. Wherein C1 and C2 cooperate to prevent overpressure; the capacitor C3 is used for improving the transient response problem of the power supply unit 1; wherein the diode VD is incorporated to prevent the regulation terminal from short-circuiting, thereby performing protection. In addition, a terminal is connected to each end of the C3 for connecting with a multimeter, or a miniature voltmeter is installed for observing the voltage. Through tests, the voltage is changed by adjusting the potentiometer R01, and when the resistance value of the potentiometer R01 is fixed, the voltage is stable and unchanged; by adjusting the adjustable resistor R01, the required voltage value can be obtained.

In a specific embodiment, the integrated application circuit 21 includes a waveform generator 211, a voltage follower 212, a differential proportional operation circuit 213, a voltage comparison circuit 214, and an optical coupling isolation output circuit 215, which are connected in sequence. After the direct current source supplies power, the required voltage is obtained through the resistance value of the potential regulator R01. After the output voltage generates sawtooth waves through the waveform generator 211, the sawtooth waves are buffered and isolated through the voltage follower 212 and output through the temperature control instrument, the sawtooth waves are adjusted and amplified through the difference ratio proportion operation circuit 213, then the sawtooth waves are input into the voltage comparison circuit 214 together, the diode is triggered in a zero-crossing mode, and output control is conducted through the optical coupling isolation output circuit 215.

Specifically, the waveform generator 211 includes a hysteresis comparator OP1, a non-inverting input terminal of the hysteresis comparator OP1 is connected to the output terminal of the power supply unit 1 through a resistor R011, an inverting input terminal of the hysteresis comparator OP1 is connected to the output terminal of the power supply unit 1 through a capacitor C4, an output terminal of the hysteresis comparator OP1 is connected to the inverting input terminal thereof through resistors R013 and R014 in sequence, and a non-inverting input terminal of the hysteresis comparator OP1 is connected to the output terminal of the hysteresis comparator OP1 through R012 and R013 in sequence. Compared with the existing sawtooth wave generator which needs two operational amplifiers, the waveform generator 211 of the embodiment only needs one hysteresis comparator OP1, and the structure is simple; the non-inverting input end of the voltage follower OP2 is connected with the inverting input end of the hysteresis comparator OP1, and the voltage follower OP2 plays roles of buffering and isolating, so that hidden dangers such as overlarge voltage, waveform distortion and the like are solved.

When the power supply is switched on, there is no voltage on the capacitor C4, i.e. the initial voltage is 0, and the voltage Uc on C4 increases exponentially by charging the capacitor through R013 and R014. After a certain time, when the voltage Uc on C4 is greater than or equal to the non-inverting input terminal-to-ground voltage U + of the hysteresis comparator OP1, C4 discharges through R014. The inverting input end of the hysteresis comparator OP1 is connected with the output end, so that negative feedback is strengthened, a protection effect is achieved when the output is close to the limit, saturation can be quitted, and limited voltage is output. At this time, the capacitor C4 is repeatedly charged and discharged, Uc oscillates, and the voltage goes around near U +, thereby generating a sawtooth wave.

In order to convert the input differential signal into a single-ended signal, the differential proportional operation circuit 213 is required. Specifically, the differential proportional operational circuit 213 includes an operational amplifier OP3, resistors R14, R15, R021, R022, R024, R025 and a potentiometer R023, a non-inverting input terminal of the operational amplifier OP3 is connected to an output cathode of the power supply unit 1 through the resistors R021 and R024 in sequence, a connection point of the resistors R021 and R024 is connected to one end of the potentiometer R023, the other end of the potentiometer R023 is connected to ground, an inverting input terminal of the operational amplifier OP3 is connected to one end of the resistor R022, the other end of the resistor R022 is connected to an output anode of the power supply unit 1 through a resistor R14, the other end of the resistor R022 is connected to an output cathode of the power supply unit 1 through a resistor R15, and an inverting input terminal of the operational amplifier OP3 is connected to an output terminal of the operational amplifier OP3 through the resistor R025.

In consideration of current limiting protection and other problems, resistors R14 and R15 are added to the inverting input terminal. According to the conventional differential proportional operation circuit 213, in order to ensure the balance of the input terminal to the ground resistance and prevent the common mode rejection ratio from decreasing, R021 ═ R022 and R024 ═ R025 are required; when the circuit is just turned on, it is necessary to make the resistance value of R023 close to 0. Then, the voltage amplification factor of the differential proportional operation circuit 213 is controlled by the adjustment potentiometer R023.

Specifically, the voltage comparison circuit 214 includes a voltage comparator OP4, a non-inverting input of the voltage comparator OP4 is connected to the output terminal of the operational amplifier OP3, an inverting input of the voltage comparator OP4 is connected to the output terminal of the voltage follower OP2, and an output terminal of the voltage comparator OP4 is connected in series to a resistor R16 and a diode VD 2. The resistor R16 is added at the output end, voltage can be converted into current, and then the current is matched with the diode VD2, and zero-crossing triggering is realized by utilizing the switching characteristic of the diode VD 2. In order to observe the variation of the output level, the led VD2 with green or blue light is finally selected according to various environments, as shown in fig. 5. By utilizing the principle of light energy emission, when the voltage of a non-inverting input end of the voltage comparator OP4 is greater than that of an inverting input end, a forward voltage is output, the diode is in a forward working state, and the diode is conducted, wherein the intensity of light emission is related to the voltage; when the voltage of the non-inverting input terminal is smaller than that of the inverting input terminal, a saturated negative voltage is output, and the diode does not emit light at the moment.

Specifically, the optical coupler isolation output circuit 215 includes a photoelectric coupler, an input end of the photoelectric coupler is connected to an output end of the voltage comparison circuit 214, an output end of the photoelectric coupler is sequentially connected in series to a resistor R17 and a protection module, and the protection module is a fuse link. Because the input and the output of the photoelectric coupler are not electrically connected, mutual isolation is realized, and the electric signal has unidirectionality, insulativity and anti-interference performance in the transmission process; and the input loop and the output loop can bear high voltage of thousands of volts, so that the safety guarantee is good. The resistor R17 is added to the output end to limit the current. Considering that the electronic device has a limited ability to withstand overload and can be protected when a fault occurs, a load is unstable or a short circuit occurs, a protection module is added. The fuse link is specifically selected because of its low cost, high sensitivity and easy replacement.

The invention adopts a brand-new zero-crossing trigger plate, adds a resistor and a potentiometer into a voltage-stabilized power supply, realizes voltage regulation by adjusting current, and solves the problem that proper working voltage cannot be adjusted and selected because voltage is fixed. The potentiometer is changed into a resistor in the integrated application circuit 21, and is simultaneously integrated into a potentiometer to provide guarantee for differential amplification; meanwhile, the fuse link is used for replacing the self-recovery fuse, so that the response time is saved, and the stability of the trigger plate during working is improved.

The invention also discloses a control method based on the adjustable trigger plate, which comprises the following steps:

firstly, the potentiometer R01 is adjusted to enable the power supply unit 1 to output stable preset voltage meeting the requirements of the integrated application circuit unit 2;

when the load power is smaller than the preset power and only a single temperature zone is available, an independent working mode is adopted: the power supply unit 1 is connected in series with a single integrated application circuit 21;

when the load power is greater than the preset power and a plurality of temperature zones exist, a parallel working mode is adopted: the plurality of integrated application circuits 21 are connected in parallel and then connected in series to the power supply unit 1.

The above invention is further illustrated below with reference to a specific embodiment:

the working mode and the given value of the invention are set as follows: the trigger plate of the invention has an independent working mode and a parallel working mode.

In operation, the potentiometer R01 is first adjusted to obtain the required voltage applied to the integrated circuit by observing the voltage on the voltmeter or multimeter, and the potentiometer R023 must be adjusted to a minimum value, which is approximately 0, to ensure the stability of the differential proportional operating circuit 213.

Taking furnace body heating as an example, when the trigger plate is butted with a furnace body with low power and only a single temperature zone, the trigger plate is usually set to be in an independent working mode, namely, a single voltage stabilizing source is connected with a single integrated application circuit 21 in series to act on a single load. When the trigger plate is butted with a furnace body with high power and a plurality of temperature zones, a parallel working mode is adopted, namely a single voltage stabilizing source and a plurality of integrated application circuits 21 connected in parallel act on a large load. According to different requirements of precision control, the higher the precision requirement is, the more temperature zones are; assuming that the furnace has n temperature zones, n integrated application circuits 21 need to be incorporated. The potentiometer R023 in each integrated application circuit 21 is then adjusted to determine the upper limit of the power during heating, which is taken according to the actual situation.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.