Patent Publication Number: US-2022240348-A1

Title: Intelligent-identification quick-charge heating control device for electric heating products

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the field of heating control devices, and more particularly to an intelligent-identification quick-charge heating control device for electric heating products. 
     2. Description of the Prior Art 
     Electric heating products (such as electric heating quilts, electric blankets, hot compresses, etc.) are essential items for cold winters. At present, it is difficult for a controller of the electric heating products on the market to quickly identify a quick charge source in order to charge a heating load more quickly (with a higher DC voltage), and thus resulting in long heating time and low heating efficiency. In addition, the conventional quick charge source will enter into a sleep mode and result in no output current after having been working for a period of time. 
     In view of the aforementioned problems of the prior art, the inventor of the present invention based on years of experience in the related industry to conduct extensive research and experiment, and finally developed an intelligent-identification quick-charge heating control device for electric heating products in accordance with the present invention to overcome the problems of the prior art. 
     SUMMARY OF THE INVENTION 
     Therefore, it is a primary objective of the present invention to provide an intelligent-identification quick-charge heating control device for electric heating products, so that after a successful handshake, a quick charge source can charge a heating load quickly to reduce the heating time and improve the heating efficiency, and users may operate a button to wake up the quick charge source to continue working, so as to avoid the quick charge source from entering into the sleep mode and wake up the operation flexibly. 
     To achieve the aforementioned and other objectives, the present invention discloses an intelligent-identification quick-charge heating control device for electric heating products comprising a button wake-up circuit for waking up a quick charge source by a button, a main control circuit that supports a quick charge (QC) protocol, a power supply circuit for supplying power to the main control circuit, a Type-C interface for pairing and coupling the quick charge source, and an output control circuit coupled to a heating load, and the main control circuit being coupled to the output control circuit and the button wake-up circuit; wherein, the Type-C interface comprises a pin IN+, a pin IN−, a pin D+, a pin D− and a pin OUT1−, the pin IN+ is coupled to the power supply circuit through the button wake-up circuit, the pin IN− is grounded, the pin D+ and pin D− are coupled to the main control circuit and completes a handshake communication of a quick charge (QC) protocol with the quick charge source, the pin OUT1− is coupled to the output control circuit to quickly charge the heating load under the condition of the handshake communication. 
     Compared with the prior art, the present invention has the following advantages and effects: The invention mainly uses the main control circuit that supports the quick charge (QC) protocol and the quick charge source to complete a handshake communication of the quick charge (QC) protocol and achieve the effects of quickly charging the heating load by the quick charge source after obtaining a successful handshake communication with the quick charge source, so as to reduce the heating time and improve the heating efficiency. Primarily, the invention uses the button wake-up circuit to automatically operate the button to wake up the quick charge source to continue working, so as to avoid the quick charge source from entering into the sleep mode, and the wakeup process is automatic and flexible. 
     Secondly, the invention uses the overvoltage detection circuit and the anti-surge circuit to improve the safety and reliability of the product. 
     Thirdly, the invention uses the status indicating light circuit to timely show the operating status of the product and the overall circuit structure is designed skillfully and reasonably to ensure the stability and reliability of the product during use. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic block diagram showing the control principle of a preferred embodiment of the present invention; and 
         FIG. 2  is a schematic circuit diagram showing a circuit in accordance with a preferred embodiment of the present invention (without showing a quick charge source and a heating load). 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIGS. 1 and 2  for an intelligent-identification quick-charge heating control device for electric heating products, the device comprises a button wake-up circuit  20  for waking up a quick charge source  70 , a main control circuit  10  that supports a quick charge (QC) protocol, a power supply circuit  30  for supplying power to the main control circuit  10 , a Type-C interface  40  provided for pairing and coupling the quick charge source  70 , and an output control circuit  60  coupled to a heating load  50 , and the main control circuit  10  is coupled to the output control circuit  60  and the button wake-up circuit  20 . 
     In this embodiment, the quick charge source  70  is a power bank or a charger that supports the quick charge (QC) protocol. Of course, the quick charge source  70  can also be other Type-C quick charge source  70  and is not limited by this embodiment. The heating load  50  can be a heating wire. Of course, the heating load  50  can be other heating loads  50  and is not limited by this embodiment. 
     The Type-C interface  40  comprises a pin IN+, a pin IN−, a pin D+, a pin D− and a pin OUT1−, and a pin OUT2−. The pin IN+ is coupled to the power supply circuit  30  through the button wake-up circuit  20 , the pin IN− is grounded, the pin D+ and pin D− are coupled to the main control circuit and completes a handshake communication of a quick charge (QC) protocol with the quick charge source  70 . In this embodiment, there are two heating loads  50 , and the pin OUT1− and the pin OUT2− are coupled to the output control circuit  60  for outputting a 20 VDC voltage to the corresponding heating load  50  to complete a quick charge of the corresponding heating load  50  under the handshake communication condition. 
     In this embodiment, the main control circuit  10  comprises a main control chip Ul that supports a QC quick charge protocol (such as QC2.0 protocol, QC3.0 protocol and QC4.0 protocol), and the main control chip Ul has a plurality of main control pins  1  to  16 . 
     The main control pin  4  and the main control pin  5  are coupled to the output control circuit separately, the main control pin  9  is coupled to the power supply circuit  30 , the main control pin  14  is coupled to the pin D− of the Type-C interface  40 , and the main control pin  15  is coupled to the pin D+ of the Type-C interface. 
     In this embodiment, the output control circuit  60  comprises a first output control circuit  61  and a second output control circuit  62 . 
     The first output control circuit  61  comprises a resistor R 13 , a resistor R 8  and a MOS tube Q 1 , and the main control pin  4  of the main control circuit  10  is coupled to a gate of the MOS tube Q 1  through the resistor R 13 , the gate of the MOS tube Q 1  is coupled to a source of the MOS tube Q 1  through the resistor R 8 , the source of the MOS tube Q 1  is grounded, and a drain of the MOS tube Q 1  is coupled to the pin OUT1−. 
     The second output control circuit  62  comprises a resistor R 7 , a resistor R 14  and a MOS tube Q 2 , the main control pin  5  of the main control circuit  10  is coupled to a gate of the MOS tube Q 2  through the resistor R 7 , the gate of the MOS tube Q 2  is coupled to a source of the MOS tube Q 2  through the resistor R 14 , and the source of the MOS tube Q 2  is grounded, and a drain of the MOS tube Q 2  is coupled to the pin OUT2−. 
     In this embodiment, the button wake-up circuit  20  comprises a button S 1 , a diode D 6 , a diode D 7 , a resistor R 11 , a resistor R 12 , a resistor R 17 , a resistor R 18 , a capacitor C 1 , a MOS tube Q 4  and a triode Q 3 , a cathode of the diode D 7  and a cathode of the diode D 6  are jointly grounded by the button S 1 , the main control pin  10  of the main control circuit  10  is coupled to an anode of the diode D 7 , an anode of the diode D 6  is coupled to a collector of the triode Q 3  through the resistor R 12 , and the anode of the diode D 6  is coupled to a gate of the MOS tube Q 4 . 
     The gate of the MOS tube Q 4  is grounded by the capacitor C 1 , the pin IN+ is coupled to a source of the MOS tube Q 4 , the source of the MOS tube Q 4  and the gate of the MOS tube Q 4  are coupled to each other through the resistor R 11 , and a drain of the MOS tube Q 4  is coupled to a voltage regulation pin  2  of the power supply circuit  30 ; the main control pin  3  of the main control circuit  10  is coupled to a base of triode Q 3  through the resistor R 17 , an emitter of the triode Q 3  is grounded, and the base and emitter of the triode Q 3  are coupled to each other through the resistor R 18 . 
     In this embodiment, in order to wake up the button conveniently, the button wake-up circuit  20  further comprise a button S 2 , a diode D 4  and a diode D 5 ; a cathode of the diode D 4  and a cathode of the diode D 5  are jointly grounded by the button S 2 , the main control pin  1  of the main control circuit  10  is coupled to an anode of the diode D 5 , and an anode of the diode D 4  is coupled to the anode of the diode D 6 . 
     Since the Type-C interface  40  is plugged in the power bank and situated at a standby mode for a long time, the power bank will be in a sleep mode without outputting power. In this embodiment, regardless of pressing the button S 1  or button S 2 , we can plug in the Type-C interface  40  to wake up the power bank by analogy. For example, pressing the button S 1  is used here to illustrate the working principle in this embodiment. 
     After the button S 1  is pressed, the button S 1  is grounded instantly, and the MOS tube Q 4  is conducted instantly, and the main control chip Ul is started immediately to continue sending a signal to trigger the MOS tube Q 4  and maintain the conduction of the MOS tube Q 4 , so that the main control chip Ul has the power continuously and keeps on conducting the MOS tube Q 1  and the MOS tube Q 2  to charge the heating load  50  quickly. 
     The power supply circuit  30  comprises a three-terminal voltage regulator U 3 , a capacitor C 4 , a capacitor C 5 , a capacitor C 6 , a capacitor C 7  and a diode D 1 . 
     The three-terminal voltage regulator U 3  comprises a plurality of voltage regulation pins  1  to  3 , the voltage regulation pin  1  is grounded, the pin IN+ is coupled to a positive electrode of the diode D 1 , a negative electrode of the diode D 1  is coupled to the voltage regulation pin  2 , the voltage regulation pin  2  is coupled to the voltage regulation pin  1  through the capacitor C 5 , the capacitor C 7  is coupled in parallel with both terminals of the capacitor C 5 ; the voltage regulation pin  3  outputs a 3.3 VDC voltage to the main control pin  9  of the main control circuit  10 , the voltage regulation pin  3  is coupled to the voltage regulation pin  1  through the capacitor C 6 , and the capacitor C 4  is coupled in parallel with both terminals of the capacitor C 6 . 
     The present invention further comprises an anti-surge circuit  81 , a status indicating light circuit  90 , and an overvoltage detection circuit  82  for detecting a voltage between the pin IN+ and the pin IN−. 
     The pin IN+ is coupled to the voltage regulation pin  2  of the power supply circuit  30  through the anti-surge circuit  81 . Preferably, the anti-surge circuit  81  comprises a diode D 2  having a terminal coupled to the pin IN+ and the other terminal grounded. 
     Wherein, a transient voltage suppressor (TVS) diode is a general high-efficiency circuit protection device with an extreme quick response time (sub-nanoscale) and a very high surge absorption capacity. When both terminals of the TVS diode undergo an instant impact of high energy, the TVS diode can change the impedance between the two terminals from high impedance to low impedance and absorb a large instantaneous current and clamp the voltage at both terminals to a predetermined value to protect the subsequent circuits and components from being impacted by the transient high-voltage peak pulse power. 
     The power supply circuit  30  is electrically coupled to the status indicating light circuit  90 , and the status indicating light circuit  90  is coupled to the main control circuit  10 . 
     The status indicating light circuit  90  comprises a first status indicating light circuit  91 , and the status indicating light circuit  90  comprises a first status indicating light LED 1 , a status indicating light LED 2 , a status indicating light LED 3 , a status indicating light LED 4 , a status indicating light LED 5 , a status indicating light LED 6 , a resistor R 4 , a resistor R 5  and a resistor R 6 . 
     Both negative electrodes of the status indicating light LED 1  and the status indicating light LED 4  are coupled to the main control pin  7  of the main control circuit  10  through the resistor R 5 ; both negative electrodes of the status indicating light LED 2  and the status indicating light LED 5  are coupled to the main control pin  6  of the main control circuit  10  of the through the resistor R 6 ; both negative electrodes of the status indicating light LED 3  and the status indicating light LED 6  are coupled to the main control pin  16  of the main control circuit  10  through the resistor R 4 ; six positive electrodes of the status indicating lights LED 1  to LED 6  are coupled to the power supply circuit  30 . It is noteworthy that there are two heating loads  50  in this embodiment, and thus the status indicating light circuit  90  further comprises a second status indicating light circuit  92 , the first status indicating light circuit  91  and the second status indicating light circuit  92  are provided for showing the working status of the corresponding heating loads  50 , and the second status indicating light circuit  92  and the first status indicating light circuit  91  have the same circuit structure. The circuit structure of the second status indicating light circuit  92  is illustrated in  FIG. 2 . 
     The overvoltage detection circuit  82  comprises a resistor R 21 , a resistor R 22  and a capacitor C 11 , and the pin IN+ is coupled to the main control pin  2  of the main control circuit  10  through the resistor R 21 , and the main control pin  2  of the main control circuit  10  is grounded by the resistor R 22 , and both terminals of the resistor R 22  are coupled in parallel with the capacitor C 11 . In this embodiment, the overvoltage detection circuit  82  is disposed between the button wake-up circuit  20  and the power supply circuit  30 . 
     Next, the principle of identifying the quick charge source  70  and charging the electric heating products quickly will be elaborated below: 
     After the Type-C interface  40  is plugged and connected to the quick charge source  70 , the quick charge source  70  outputs a standard 5 VDC voltage, and the power supply circuit  30  converts the standard 5 VDC voltage into a 3.3 V working voltage which is supplied to the main control chip Ul and the status indicating light circuit  90 . 
     After the main control chip Ul is electrically conducted, the main control pin  14  and the main control pin  15  send a handshake signal to the corresponding pin D− and pin D+ of the Type-C interface  40 . Once the handshake communication succeeds, the pin OUT1− of the Type-C interface  40  outputs a 20V voltage to the drain of the MOS tube Q 1 . In the meantime, the pin OUT2− also outputs a 20V voltage to the drain of the MOS tube Q 2 , so that both MOS tube Q 1  and MOS tube Q 2  are electrically conducted, and the Type-C interface  40  outputs a 20V voltage to the corresponding heating load  50  for a quick charge and the heating load  50  can be heated quickly.