Detection circuit control structure

Abstract

The utility model provides a detection circuit control structure which comprises a working circuit and a main control unit, the working circuit comprises a heating body and a control switch which are sequentially arranged between a live wire and a zero wire, and a control circuit and a detection circuit which are arranged in parallel are arranged between the main control unit and the working circuit. The control circuit is connected to a control electrode of the control switch; the detection circuit comprises a voltage division circuit, one end of the voltage division circuit is connected between the heating body and the control switch, the other end of the voltage division circuit is connected to a zero line, the voltage division circuit comprises a voltage division resistor and a sampling resistor which are connected in series, and a sampling point is further arranged between the voltage division resistor and the sampling resistor and connected to the main control unit. The voltage change of the heating body is acquired through the voltage division circuit, the working state of the load can be acquired in real time without an external sensor, and the complexity and cost of the system are reduced; the main control unit can quickly recognize abnormal working conditions based on feedback signals of the detection circuit and control switch trigger signals at any time, circuit damage is prevented, and system safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to circuit control and safety technical field, concretely relates to a detection circuit control structure. BACKGROUND

[0002] In prior art, the circuit control method based on control switch focuses on the realization of on-off function, usually only directly drives the heating body to work through the control circuit, lacks the real-time monitoring ability to the load state, such kind of scheme depends on external sensor or discrete component to indirectly acquire the voltage, current or temperature information of the heating body, leads to high system complexity, cost increase, and the introduction of external device can introduce signal delay or interference, influences control precision, in addition, the system without integrated detection function cannot directly perceive load abnormality (such as overcurrent, overtemperature or short circuit), has the potential safety hazard, especially in long time operation or high power scene, is easy to cause equipment damage even safety accident due to state out of control, therefore, an integrated scheme integrating detection and control function is urgently needed to simplify system structure, improve safety and response efficiency. SUMMARY

[0003] (1) Technical problem to be solved

[0004] The utility model provides a detection circuit control structure, aims at solving the problem of unable to detect the heating state of heating body.

[0005] (2) Technical scheme

[0006] The utility model provides a detection circuit control structure, including working circuit and main control unit connected in the working circuit, the working circuit includes heating body and control switch and is sequentially arranged between live wire and zero line, be equipped with control circuit and detection circuit that are arranged in parallel between the main control unit with the working circuit, the control circuit is connected in the control electrode of control switch,

[0007] Among them, the detection circuit includes the voltage dividing circuit, one end of the voltage dividing circuit is connected between the heating body and control switch, the other end is connected to the zero line, the voltage dividing circuit includes voltage dividing resistance and sampling resistance that are arranged in series, sampling point is further equipped between the voltage dividing resistance and sampling resistance, the sampling point is connected to the main control unit.

[0008] Further, the control switch is a bidirectional control switch or a unidirectional control switch.

[0009] Further, the control switch is a thyristor or a thyristor.

[0010] Further, the detection circuit is provided with at least one filter capacitor in parallel with the sampling resistance, one end of the filter capacitor is connected to the sampling point, and the other end is connected to the zero line.

[0011] Further, the voltage dividing resistor and the sampling resistor are proportionally arranged, and the resistance value of the voltage dividing resistor is greater than that of the sampling resistor.

[0012] Further, the main control unit is a single-chip microcomputer.

[0013] Further, the single-chip microcomputer is provided with a first pin and a second pin, the first pin is connected to the control circuit, and the second pin is connected to the detection circuit.

[0014] Further, the control circuit comprises a current limiting resistor arranged between the first pin and the control switch.

[0015] Further, the control circuit further comprises a pull-down resistor, one end of the pull-down resistor is connected between the current limiting resistor and the control switch, and the other end of the pull-down resistor is connected to the zero line.

[0016] Further, the heating body is any one of MCH, PTC, heating wire and heating film.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The voltage change of the heating body is directly collected through the voltage dividing circuit, the working state of the load can be acquired in real time without an external sensor, the system complexity and cost are reduced, the main control unit can quickly identify abnormal working conditions such as over-temperature and over-current based on the feedback signal of the detection circuit, and the control switch trigger signal is immediately cut off, so that the equipment damage or safety accidents are prevented, and the system safety is significantly improved; the filter capacitor effectively filters high-frequency noise, and ensures that the sampling signal is accurate and reliable; the pull-down resistor forcibly controls the signal to be at a low level when there is no triggering, the risk of false triggering is eliminated, and the stability of the control circuit is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The flowchart of the utility model.

[0020] Figure 2 The principle block of the utility model Figure One .

[0021] Figure 3 The principle block of the utility model Figure Two .

[0022] The drawing mark: 1-working circuit, 2-main control unit, 3-control circuit, 4-detection circuit, 41-voltage dividing circuit, 42-sampling point. DETAILED DESCRIPTION

[0023] The technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings in the utility model embodiment.

[0024] As shown in the figure, the utility model provides a kind of detection circuit control structure, including working circuit 1 and the main control unit 2 being connected with the working circuit 1, the main control unit 2 is output to the working circuit 1 trigger signal and receives information from the working circuit 1, the working circuit 1 is arranged between live wire ACL and zero line ACN, the working circuit 1 includes heating body H and control switch T1, the temperature of the heating body H will continue to rise after being powered on, simultaneously, the resistance on the heating body H also will increase with the temperature rise, in addition, the heating body H can be MCH, PTC, heating wire, heating film and so on all load heating body on market arbitrary one, the control switch T1 is a two-way control switch, the two-way control switch is thyristor, in other embodiments, the control switch can also be set as one-way control switch, the thyristor can also be replaced by thyristor, same can reach same effect, and the reason of this design is that it is in the circuit of alternating current, the control switch T1 includes control electrode G, anode and cathode, the working principle of the control switch H is: in normal state, the control switch T1 is in blocking state, when the control electrode G receives a trigger signal, the anode and cathode are conducted;Control circuit 3 and detection circuit 4 are equipped between the main control unit 2 and the working circuit 1, the control circuit 3 is connected to the control electrode G of the control switch T1 to output trigger signal to it to control the conduction of the working circuit 1.

[0025] In the prior art, only control circuit is generally provided, and whether the heating body H works is simply controlled, and the voltage and current of the heating body H are not detected, so that the working state and other information cannot be judged, and only information obtained by other external inductive devices can be used to control heating body heating, which can cause safety hazard, and to solve the above problems, a detection circuit 4 is added between the main control unit 2 and the working circuit 1, the detection circuit 4 is provided with a voltage dividing circuit 41, one end of the voltage dividing circuit 41 is connected between the heating body H and the control switch T1, the other end is connected to the zero line ACN, the voltage dividing circuit 41 is also provided with a sampling point 42, and the main control unit 2 is connected to the sampling point 42, so that the main control unit 2 can obtain the change information of the heating body H through the sampling point 42.

[0026] Specifically, in an example of the utility model, the main control unit 2 is singlechip MCU, the singlechip MCU is equivalent to the brain of whole circuit, and is equipped with first pin TRIAV and second pin VCHECK, releases high level through first pin TRIAV, triggers the control electrode G of control switch T1, and then makes the working circuit 1 conduct, if first pin TRIAV releases low level, then the working circuit 1 disconnects, the heating body H stops heating, and the second pin VCHECK is connected to the detection circuit 4 and receives information.

[0027] Specifically, in the detection circuit 4, the voltage dividing circuit 41 is provided with at least one voltage dividing resistor R1 and at least one sampling resistor R2 connected in series with the voltage dividing resistor R1, the voltage dividing resistor R1 and the sampling resistor R2 are arranged in proportion, and the resistance value of the voltage dividing resistor R1 is greater than that of the sampling resistor R2. The voltage dividing circuit 41 and the control switch T1 to the ACN circuit are in parallel relationship, that is, the voltage across the heating body H is equal to the voltage of the voltage dividing circuit 41. Because the voltage dividing resistor R1 and the sampling resistor R2 are connected in series, according to Ohm's law, the voltage ratio of the two and the resistance ratio of the two are the same, that is, the voltage change of the sampling resistor R2 is the same as that of the heating body H. At the same time, the sampling point 42 is arranged between the voltage dividing resistor R1 and the sampling resistor R2, so that the voltage of the sampling resistor R2 collected by the sampling point 42 is the voltage change of the heating body H. The information is transmitted to the second pin VCHECK of the singlechip MCU, and then converted through AD data processing, so that the singlechip MCU receives the working state and information of the heating body H.

[0028] Further, the voltage dividing resistor R1 functions to increase the resistance, that is, increase the resistance ratio with the sampling resistor R2, and then increase the voltage dividing ratio of the two, so as to reduce the voltage shared by the sampling resistor R2, thereby preventing the voltage delivered to the singlechip MCU from being too large to cause damage to it. At the same time, the large resistance value of the voltage dividing resistor R1 can also limit the current size of the whole voltage dividing circuit 41, thereby reducing power consumption, reducing heat and avoiding damage to the singlechip MCU caused by excessive current.

[0029] Further, the detection circuit 4 is provided with at least one filter capacitor C1 in parallel with the sampling resistor R2, one end of the filter capacitor C1 is connected with the sampling point 42, and the other end is connected with the zero line ACN, the filter capacitor C1 is used for anti-interference, so that the single-chip microcomputer MCU is more stable when collecting voltage change, and the specific principle is that high-frequency noise is attenuated and low-frequency signal is stabilized, and the specific principle is that: attenuating high-frequency noise: the high-frequency interference signal (such as electromagnetic radiation, switching noise, etc.) in the circuit presents low impedance, so that the noise current is bypassed to the ground, and the interference signal is prevented from entering the AD collection end of the single-chip microcomputer MCU; stabilizing direct current / low-frequency signal: the low-frequency effective signal (such as the slow voltage change caused by the resistance value change of the H heating body) presents high impedance, and the effective signal can be smoothly transmitted to the single-chip microcomputer MCU.

[0030] Specifically, in an example of the utility model, the control circuit 3 is provided with a current limiting resistor R3, the current limiting resistor R3 is arranged between the first pin TRIAV and the control switch T1, the current limiting resistor R3 is used for limiting the current size flowing into the control electrode G of the control switch T1 on the one hand, avoiding damage caused by excessive current, and protecting the output port of the single-chip microcomputer MCU on the other hand, when the first pin TRIAV is off, reverse voltage or current mutation may be generated, at this time, the current limiting resistor R3 can be used as a load resistor.

[0031] Further, the control circuit 3 is provided with a pull-down resistor R4, one end of the pull-down resistor R4 is connected between the current limiting resistor R3 and the control switch T1, and the other end is connected with the zero line ACN, the pull-down resistor R4 is used for: when the single-chip microcomputer MCU does not output a signal, the first pin TRIAV is neither connected with a high level nor connected with a low level, and this state is unstable, at this time, the pull-down resistor R4 is arranged to forcibly pull down the first pin TRIAV to a low level, avoiding out of control, and when the single-chip microcomputer MCU outputs a high level, the pull-down effect of the pull-down resistor R4 is "defeated" by the power of the high level, the first pin TRIAV level is forcibly pulled high, triggering the control switch T to conduct, and the pull-down resistor R4 makes the first pin TRIAV always be in two states of high level or low level.

[0032] The working principle of the utility model is described in detail as follows:

[0033] The utility model discloses a single -chip microcomputer MCU controls and detects to working circuit 1, when the single -chip microcomputer MCU passes through the first pin TRIAV output high level trigger signal, the current -limiting resistance R3 in control circuit 3 signal is delivered to the control electrode G of control switch T1, make it conduct, the heating body H starts heating after working circuit 1 power on, the resistance value of heating body H increases with temperature rise, and the voltage variation at both ends is fed back to the single -chip microcomputer MCU in real time through voltage dividing circuit 41, voltage dividing circuit 41 is composed of voltage dividing resistance R1 and sampling resistance R2 in series, and the sampling point 42 is located between the two, and the voltage signal of sampling resistance R1 is directly collected, and the signal is transmitted to the single -chip microcomputer MCU for AD conversion and analysis through the filter capacitor C1 after high-frequency noise is filtered out, the single -chip microcomputer MCU judges the working state (such as overtemperature or abnormality) of heating body H according to the voltage variation collected, in addition, the pull -down resistance R4 ensures that the control signal is low when there is no output, avoids false triggering, and the whole process does not need to rely on external sensor, and realizes accurate, safe circuit management through integrated detection and control.

[0034] The utility model discloses an innovation lies in: the utility model passes through integrated detection circuit and control circuit, realizes real -time monitoring and closed -loop control to heating body state, effectively solved the problem of relying on external sensor, low safety and control precision deficiency in the prior art, and specific innovation includes: state self -perception ability: through voltage dividing circuit and sampling resistance direct collection heating body voltage variation, can obtain load working state in real time without external sensor, reduces the system complexity and cost, and avoids external signal interference simultaneously;Dynamic safety protection: the main control unit is based on the feedback signal of detection circuit, can identify overtemperature, overcurrent and other abnormal conditions quickly, and immediately cut off control switch trigger signal, prevents equipment damage or safety accident, and significantly improves system safety;Anti -interference and stability optimization: filter capacitor effectively filters high-frequency noise, ensures that sampling signal is accurate and reliable;The pull -down resistance forces control signal to keep low when there is no trigger, eliminates the risk of false triggering, and enhances the stability of control circuit.

[0035] The above-mentioned innovation makes the utility model have the advantages of high safety, high reliability and intelligent control on the basis of simplifying structure and reducing cost, and is suitable for various electric appliances that need accurate temperature control and safety protection.

[0036] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other implementations that can be understood by those skilled in the art.

[0037] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims shall be construed as limiting the scope of the claims.

Claims

1. A detection circuit control structure, characterized by, The working circuit (1) comprises a heating body (H) and a control switch (T1) and is arranged between an active line (ACL) and a neutral line (ACN) in sequence, and the master control unit (2) is provided with a control circuit (3) and a detection circuit (4) arranged in parallel between the working circuit (1) and the master control unit (2), and the control circuit (3) is connected to the control electrode (G) of the control switch (T1); The detection circuit (4) comprises a voltage dividing circuit (41), one end of which is connected between the heating body (H) and the control switch (T1), and the other end of which is connected to the neutral line (ACN), and the voltage dividing circuit (41) comprises a voltage dividing resistor (R1) and a sampling resistor (R2) arranged in series, and a sampling point (42) is further arranged between the voltage dividing resistor (R1) and the sampling resistor (R2), and the sampling point (42) is connected to the master control unit (2).

2. The detection circuit control structure according to claim 1, wherein, The control switch (T1) is a bidirectional control switch or a unidirectional control switch.

3. The detection circuit control structure according to claim 2, wherein, The control switch (T1) is a thyristor or a silicon-controlled rectifier.

4. The detection circuit control structure according to claim 3, wherein, The detection circuit (4) is provided with at least one filter capacitor (C1) connected in parallel to the sampling resistor (R2), one end of the filter capacitor (C1) is connected to the sampling point (42), and the other end of the filter capacitor (C1) is connected to the neutral line (ACN).

5. The detection circuit control structure according to claim 4, wherein, The voltage dividing resistor (R1) and the sampling resistor (R2) are arranged in proportion, and the resistance value of the voltage dividing resistor (R1) is greater than the resistance value of the sampling resistor (R2).

6. The detection circuit control structure according to claim 1, wherein, The master control unit (2) is a single-chip microcomputer (MCU).

7. The detection circuit control structure according to claim 6, wherein, The single-chip microcomputer (MCU) is provided with a first pin (TRIAV) and a second pin (VCHECK), the first pin (TRIAV) is connected to the control circuit (3), and the second pin (VCHECK) is connected to the detection circuit (4).

8. The detection circuit control structure according to claim 7, wherein, The control circuit (3) comprises a current limiting resistor (R3) arranged between the first pin (TRIAV) and the control switch (T1).

9. The detection circuit control structure according to claim 8, wherein, The control circuit (3) further comprises a pull-down resistor (R4), one end of the pull-down resistor (R4) is connected between the current limiting resistor (R3) and the control switch (T1), and the other end of the pull-down resistor (R4) is connected to the neutral line (ACN).

10. The detection circuit control structure according to claim 1, wherein, The heating body (H) is any one of MCH, PTC, heating wire and heating film.

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