A direct wave curling iron heating control circuit, device and system
By introducing a current detection and control protection module into the heating control circuit of the hair straightener, and utilizing the coordinated operation of transistors and thyristors, the device can be automatically detected and protected, thus solving the problem of the lack of self-test protection in the control circuit of the hair straightener and improving safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN PUCHENG TECHNOLOGY R&D CO LTD
- Filing Date
- 2025-06-21
- Publication Date
- 2026-06-23
AI Technical Summary
The existing straightener/curling iron control circuit lacks a self-test protection module, which makes it easy to damage the equipment and pose a safety hazard to users during use.
A current detection module, a load control module, and a control protection module are introduced into the heating control circuit of the hair straightener. Through the coordinated work of transistors and thyristors, abnormal current is automatically detected and the fuse is blown to protect the equipment.
It effectively prevents damage to the equipment due to internal malfunctions and the risk of electric shock to users, thus improving the safety of using the hair straightener/curler.
Smart Images
Figure CN224401684U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hair straighteners and curling irons, specifically to a heating control circuit, device, and system for a hair straightener and curling iron. Background Technology
[0002] Hair straighteners and curling irons are popular hair styling tools, favored by many women and some professional users. They work by heating the hair, denaturing the proteins that make up the hair, thus creating different degrees of curl and styles. However, these tools typically require high temperatures in their heating elements to achieve good results and maintain the style for a longer duration. The downside is that high temperatures can damage the hair; conversely, lower heating element temperatures result in shorter-lasting styles.
[0003] Existing hair straightener control circuits often lack self-test protection modules. For example, when not in use, the straightener needs to perform a current test to check for short circuits. Using the straightener without performing a current test can easily damage it or even injure the user, posing a significant safety hazard. Utility Model Content
[0004] The purpose of this application is to provide a heating control circuit, device and system for a hair straightener / curling iron, in order to solve the problem that existing hair straightener / curling iron control circuits often lack a self-test protection module.
[0005] To solve the above problems, this application adopts the following technical solution:
[0006] The first aspect of this application provides a heating control circuit for a hair straightener / curler, comprising: a current detection module, a load control module, and a control protection module. The load control module is connected to both the current detection module and the control protection module. The control protection module includes a control terminal, a transistor, a first resistor, a thyristor, a second resistor, and a fuse. The base of the transistor is connected to both the control terminal and one end of the first resistor. One end of the second resistor and the first pin of the thyristor are both connected to the load control module. The second pin of the thyristor is connected to the fuse. The collector of the transistor is connected to both the third pin of the thyristor and the other end of the second resistor. The emitter of the transistor and the other end of the first resistor are both grounded.
[0007] Furthermore, the control and protection module is provided with a third resistor, the two ends of which are respectively connected to the control terminal and the base of the transistor.
[0008] Furthermore, the control and protection module is provided with a fourth resistor, the two ends of which are respectively connected to the third pin of the thyristor and the collector of the transistor.
[0009] Furthermore, the control and protection module is equipped with a first capacitor, the two ends of which are respectively connected to the fuse and the load control module.
[0010] Furthermore, the transistor is a bipolar transistor.
[0011] Furthermore, the thyristor is a bidirectional thyristor.
[0012] The second aspect of this application provides a heating control device for a hair straightener / curler, comprising a housing with an internal receiving cavity, and a heating control circuit for a hair straightener / curler as described in any of the preceding claims, disposed within the housing.
[0013] A third aspect of this application provides a heating control system for a hair straightener / curling iron, the hair straightener / curling iron heating control system including the aforementioned hair straightener / curling iron heating control device.
[0014] Compared with the prior art, the beneficial effects of this application are as follows: by controlling the transistor and thyristor of the protection module, when an abnormality occurs in the current detection of the hair straightener, the protection module can be triggered to burn out the fuse, thereby protecting other components of the hair straightener, reducing safety hazards, and improving product safety. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a heating control circuit for a hair straightener / curler provided in an embodiment of this application.
[0016] Explanation of reference numerals in the attached figures:
[0017] 1. Current detection module; 2. Load control module; 3. Control and protection module; 31. Control terminal; 32. Transistor; 33. First resistor; 34. Thyristor; 35. Second resistor; 36. Fuse; 37. Third resistor; 38. Fourth resistor; 39. First capacitor. Detailed Implementation
[0018] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0019] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.
[0020] It should be understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. These orientation terms are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.
[0021] Figure 1 A schematic diagram of a heating control circuit for a hair straightener / curling iron provided in this application embodiment is shown below. Figure 1 As shown in the figure, this application provides a heating control circuit for a hair straightener / curler, including: a current detection module 1, a load control module 2, and a control protection module 3. The load control module 2 is connected to the current detection module 1 and the control protection module 3. The control protection module 3 is provided with a control terminal 31, a transistor 32, a first resistor 33, a thyristor 34, a second resistor 35, and a fuse 36. The base of the transistor 32 is connected to one end of the control terminal 31 and one end of the first resistor 33. One end of the second resistor 35 and the first pin of the thyristor 34 are both connected to the load control module 2. The second pin of the thyristor 34 is connected to the fuse 36. The collector of the transistor 32 is connected to the third pin of the thyristor 34 and the other end of the second resistor 35. The emitter of the transistor 32 and the other end of the first resistor 33 are both grounded.
[0022] Specifically, to address the technical problem of existing hair straightener control circuits lacking self-test protection and posing safety hazards, this application embodiment adds a control protection module 3 to the hair straightener heating control circuit. The input terminal of the load control module 2 is connected to the power supply, and the output terminal is connected to the heating component of the hair straightener. For example, the load control module 2 is connected to ACL and ACN, and simultaneously, the load control module 2 is connected to loads Load1 and Load2. One end of the current detection module 1 is connected to the load control module 2. For example, one end of the current detection module 1 is connected to CAN, and the other end is connected to SCRA, to detect whether there is abnormal current (such as short-circuit current) in the circuit during the initial power-on of the device. The control protection module 3 works in conjunction with the load control module 2 and the current detection module 1 to achieve the protection function. The control terminal 31 receives signals from the external control unit (controller or logic circuit) to indicate the operating status of the circuit or to receive the detection results of the current detection module 1. In this application embodiment, the control terminal 31 is connected to the base of the transistor 32.
[0023] Transistor 32 is an NPN transistor. Its base is connected to control terminal 31, its emitter is grounded, and its collector is connected to the third pin (pin 3) of thyristor 34. The second pin (pin 2) of thyristor 34 is connected to fuse 36, and its first pin (pin 1) is connected to load control module 2. For example, if SCRA and SCRB are not open, and current appears in CAN, control terminal 31 will provide a drive signal, causing thyristor 34 to open, short-circuiting ACN, thus generating a large current and burning out fuse 36 (FUSE1). If current detection module 1 does not detect a short circuit or other fault during the power-on detection phase, control terminal 31 will issue a normal operation signal (e.g., maintain a high level or provide an enable signal). At this time, transistor 32 is in the off state, and thyristor 34 is in the off state. For example, if thyristor 34 is a bidirectional thyristor, the switching element inside load control module 20 will conduct normally according to the user's operation command, and the heating component will start working.
[0024] Through the heating control circuit of the hair straightener described above, this embodiment of the application can automatically perform a current self-check when the device is started. Once a fault such as a short circuit is detected, the load power supply can be quickly cut off through the control protection module 3, effectively preventing the risk of device damage and electric shock to the user due to internal faults. This significantly improves the safety of using the hair straightener and solves the safety hazard problem caused by the lack of a self-check protection module in the prior art. In particular, the transistor 32 is a bipolar transistor, for example, an NPN type BJT.
[0025] It should be noted that in this embodiment, because the transistor 32 and thyristor 34 of the control protection module 3 can trigger the control protection module 3 to burn out the fuse 36 when an abnormality occurs in the current detection of the hair straightener, thereby protecting other components of the hair straightener, reducing safety hazards, and improving product safety.
[0026] In some embodiments, the control protection module 3 is provided with a third resistor 37, the two ends of which are respectively connected to the control terminal 31 and the base of the transistor 32.
[0027] Specifically, the third resistor 37 is placed between the control terminal 31 and the base of the transistor 32. The main purpose of adding the third resistor 37 is to limit and protect the base current of the transistor 32. When the control terminal 31 outputs a high voltage or a large current signal, directly connecting it to the base of the transistor 32 may damage the transistor 32 due to excessive base current, or cause the transistor 32 to saturate too deeply, affecting the normal operation of subsequent circuits. By connecting the third resistor 37 between the control terminal 31 and the base of the transistor 32, the current flowing into the base of the transistor 32 is effectively limited. When the control terminal 31 outputs a high-level signal, the current needs to flow through the third resistor 37 to reach the base of the transistor 32. The resistance value of the third resistor 37 determines the maximum value of the base current. Choosing an appropriate resistance value for the third resistor 37 can ensure that the base current of the transistor 32 is within its safe operating range under various possible control signal conditions, avoiding damage to the transistor due to overcurrent. In addition, the third resistor 37 can also filter the control signal to a certain extent, suppress possible voltage spikes or noise, improve the circuit's anti-interference ability, and make the switching action of the transistor 32 more stable and reliable.
[0028] By adding a third resistor 37 to the control protection module 3 and connecting it in series between the control terminal 31 and the base of the transistor 32, the transistor 32 can be effectively protected from the impact of excessive base current, ensuring that the control protection module 3 can work stably and reliably for a long time, and further improving the safety and reliability of the entire hair straightener heating control circuit.
[0029] In some embodiments, the control and protection module 3 is provided with a fourth resistor 38, the two ends of which are respectively connected to the third pin of the thyristor 34 and the collector of the transistor 32.
[0030] Specifically, a fourth resistor 38 is positioned between the third pin of thyristor 34 and the collector of transistor 32. One end of the fourth resistor 38 is connected to the collector of transistor 32, and the other end is connected to the third pin of thyristor 34. For example, the other end of the fourth resistor 38 can be connected to both the third pin of thyristor 34 and the second resistor 35. When thyristor 34 is turned on, a large current may flow through the collector of transistor 32. The presence of the fourth resistor 38 limits the magnitude of this current, preventing excessive collector current from damaging transistor 32 or other circuit components. Furthermore, the fourth resistor 38, together with the third pin of thyristor 34 and the collector of transistor 32, forms a voltage divider network, which helps stabilize the collector voltage and prevents voltage fluctuations from affecting the circuit. In some cases, the turning on or off of thyristor 34 may generate voltage spikes or current surges. The fourth resistor 38 can absorb or disperse this energy, protecting transistor 32 and other sensitive components from damage. By appropriately selecting the resistance value of the fourth resistor 38, the dynamic response characteristics of the circuit can be optimized, and the stability and reliability of the entire control and protection module 3 can be improved.
[0031] By adding a fourth resistor 38 to the control and protection module 3 and connecting its two ends to the third pin of the thyristor 34 and the collector of the transistor 32 respectively, it is possible not only to effectively limit the current and stabilize the voltage, but also to protect key components from damage, thereby improving the stability and reliability of the entire circuit.
[0032] In some embodiments, the control and protection module 3 is provided with a first capacitor 39, and the two ends of the first capacitor 39 are respectively connected to the fuse 36 and the load control module 2.
[0033] Specifically, to further enhance the anti-interference capability and stability of the control and protection module 3, a first capacitor 39 is added to the control and protection module 3. One end of the first capacitor 39 is connected to a fuse 36. The fuse 36 is typically located at the power input terminal and is used to blow in the event of an overcurrent to protect subsequent circuits. Connecting one end of the first capacitor 39 after the fuse means that the first capacitor 39 and its subsequent circuits are within the protection range of the fuse. For example, the connection point is the power bus or directly connected to the power input of the subsequent control circuit. The other end of the first capacitor 39 is connected to the power input terminal of the load control module 2. To achieve power filtering, the first capacitor 39 is connected to the positive power input terminal of the load control module 2.
[0034] The first capacitor 39 is a ceramic capacitor or a multilayer ceramic capacitor (MLCC), which features low equivalent series resistance, low equivalent series inductance, and good high-frequency characteristics. Its capacitance value is selected according to the noise frequency and amplitude to be filtered. For example, the first capacitor 39 is selected as 0.1μF with a withstand voltage of 310V. In terms of layout, the first capacitor 39 is close to the output terminal of the fuse 36 and the power input terminal of the load control module 2 to shorten the connection path and reduce lead inductance, thereby filtering out high-frequency noise more effectively.
[0035] When the circuit is operating, electromagnetic interference, switching transients, or other noise signals may exist on the power line. These noise signals will be transmitted through the power line, passing through fuse 36 and reaching the first capacitor 39. The first capacitor 39 presents low impedance to high-frequency noise, effectively providing a low-impedance bypass for this noise and guiding it to the load control module 2. This filters out or attenuates the noise, making the power supply to the load control module 2 cleaner and more stable.
[0036] By setting a first capacitor 39 in the control and protection module 3 and connecting its two ends to the fuse 36 and the load control module 2 respectively, high-frequency interference can be suppressed, providing a cleaner and more stable power supply environment for the load control module 2, thereby improving the electromagnetic compatibility (EMC) and reliability of the entire system.
[0037] To better understand the heating control circuit of the hair straightener / curler in this embodiment, the heating control process will be described in detail below. For example... Figure 1 As shown, SCRA and SCRB are detected when not turned on. If current appears in CAN, it indicates that SC1 and SC2 are short-circuited, and the drive control terminal 31 (SCRC) turns on the thyristor 34 (SCR4) to form an ACN short circuit, thereby generating a large current and burning out the fuse 36 (FUSE1), thus achieving the purpose of LB1 and LB2 protection. It should be noted that in the heating control circuit of the hair straightener in this embodiment of the application, the addition of the control protection module 3 enables better heating control.
[0038] The second aspect of this application provides a heating control device for a hair straightener, a housing having an internal cavity, and a heating control circuit for a hair straightener as described above, disposed within the housing.
[0039] A third aspect of this application provides a heating control system for a hair straightener / curling iron, which includes the aforementioned heating control device for the hair straightener / curling iron.
[0040] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed in this application.
Claims
1. A heating control circuit for a hair straightener / curler, characterized in that, include: The system includes a current detection module, a load control module, and a control and protection module. The load control module is connected to both the current detection module and the control and protection module. The control and protection module includes a control terminal, a transistor, a first resistor, a thyristor, a second resistor, and a fuse. The base of the transistor is connected to the control terminal and one end of the first resistor. One end of the second resistor and the first pin of the thyristor are both connected to the load control module. The second pin of the thyristor is connected to the fuse. The collector of the transistor is connected to the third pin of the thyristor and the other end of the second resistor. The emitter of the transistor and the other end of the first resistor are both grounded.
2. The heating control circuit for a hair straightener / curler according to claim 1, characterized in that, The control and protection module is equipped with a third resistor, the two ends of which are respectively connected to the control terminal and the base of the transistor.
3. The heating control circuit for a hair straightener / curler according to claim 1, characterized in that, The control and protection module is equipped with a fourth resistor, the two ends of which are respectively connected to the third pin of the thyristor and the collector of the transistor.
4. The heating control circuit for a hair straightener / curler according to claim 1, characterized in that, The control and protection module is equipped with a first capacitor, and the two ends of the first capacitor are respectively connected to the fuse and the load control module.
5. The heating control circuit for a hair straightener / curler according to claim 1, characterized in that, The transistor is a bipolar transistor.
6. The heating control circuit for a hair straightener / curler according to claim 1, characterized in that, The thyristor is a bidirectional thyristor.
7. A heating control device for a hair straightener / curling iron, characterized in that, The housing has an internal cavity, and the heating control circuit for the hair straightener / curler as described in any one of claims 1-6 is disposed within the housing.
8. A heating control system for a hair straightener / curling iron, characterized in that, The heating control system for the hair straightener includes the heating control device for the hair straightener as described in claim 7.