Power supply circuit, chip and vehicle

Abstract

The utility model relates to the technical field of power supply, and discloses a power supply circuit, a chip and a vehicle. The power supply circuit is used for supplying power to a dimming film. The power supply circuit comprises a boosting module, a sampling module and a microcontroller. The boosting module, the sampling module, the dimming film and the microcontroller are respectively connected with the reference ground, and the sampling module comprises a first signal acquisition module and a second signal acquisition module; the boosting module generates power supply voltage based on power supply voltage provided by the battery, and the power supply voltage is used for supplying power to the dimming film; the first signal acquisition module is used for acquiring an electric signal at the input end of the dimming film, and the second signal acquisition module is used for acquiring an electric signal at the output end of the dimming film; the microcontroller is used for controlling the boost module to supply power to the dimming film according to the electric signal of the input end and the electric signal of the output end. According to the scheme, the use safety of the dimming film can be improved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply circuit, a chip and a vehicle. Background Art

[0002] The car sunroof usually uses a car film on the sunroof glass to achieve heat insulation and adjust the light intensity inside the car. At present, the types of car films include suspended particle device (SPD) and others. Due to the high-voltage working performance of SPD films and others (that is, they need to work in a high-voltage state), the power supply circuit of these car films usually includes a boost chip and a corresponding charge pump circuit to increase the working voltage of the car film.

[0003] However, the power supply circuits of these automotive films may leak electricity, posing a major safety hazard. Utility Model Content

[0004] In order to improve the safety during the use of automobile film, the embodiments of the present application provide a power supply circuit, a chip and a vehicle.

[0005] In a first aspect, an embodiment of the present application provides a power supply circuit for powering a dimming film, the power supply circuit comprising: a boost module, a sampling module and a microcontroller, the boost module, the sampling module, the dimming film and the microcontroller are respectively connected to a reference ground, the sampling module comprises a first signal acquisition module and a second signal acquisition module; the input end of the boost module is connected to a battery, the first output end of the boost module is connected to the first input end of the first signal acquisition module, the second input end of the first signal acquisition module is connected to the input end of the dimming film, the output end of the first signal acquisition module is connected to the first input end of the microcontroller, the output end of the dimming film is connected to the first input end of the second signal acquisition module, the second input end of the second signal acquisition module is connected to the second output end of the boost module, the output end of the second signal acquisition module is connected to the second input end of the microcontroller, and the output end of the microcontroller is connected to the control end of the boost module; the boost module generates a power supply voltage based on the power supply voltage provided by the battery, and the power supply voltage is used to power the dimming film; the first signal acquisition module is used to collect an electrical signal at the input end of the dimming film, and the second signal acquisition module is used to collect an electrical signal at the output end of the dimming film; the microcontroller is used to control the boost module to power the dimming film according to the electrical signal at the input end and the electrical signal at the output end. The dimming film is the high pressure glass film mentioned below.

[0006] In a possible implementation of the first aspect above, the boost module includes an isolation transformer, and a secondary winding of the isolation transformer is connected to a reference ground.

[0007] In a possible implementation of the first aspect above, the boost module also includes a signal generating module, which is used to convert the power voltage provided by the battery into an initial voltage and input the initial voltage into the isolation transformer, where the initial voltage includes a rectangular pulse voltage signal.

[0008] In a possible implementation of the first aspect above, the boost module includes a signal feedback module, which feeds back the supply voltage to the signal generating module, and the signal generating module adjusts the supply voltage according to the supply voltage and outputs the adjusted supply voltage.

[0009] In a possible implementation of the first aspect above, the boost module further includes a filter switch module, and the filter switch module is used to convert the AC adjustment voltage generated by the secondary winding of the isolation transformer into a DC supply voltage.

[0010] In a possible implementation of the first aspect above, the isolation transformer includes a primary winding and two secondary windings, wherein the primary winding is used to generate an AC voltage signal based on a received initial voltage, and the first secondary winding of the two secondary windings is used to generate a first adjustment voltage based on the AC voltage signal, and the first adjustment voltage is converted into a first supply voltage through a filtering switch module, and the first supply voltage is used to power the dimming film.

[0011] In a possible implementation of the first aspect above, the second secondary winding of the two secondary windings is used to generate a second adjustment voltage according to the AC voltage signal, and the second adjustment voltage is converted into a second supply voltage through a filtering switch module, and the second supply voltage is used to power the filtering switch module and the microcontroller.

[0012] In a possible implementation of the first aspect above, the signal feedback module includes a linear optocoupler isolator, and the first signal acquisition module and the second signal acquisition module include Hall sensors.

[0013] In a second aspect, an embodiment of the present application provides a chip, which includes any power supply circuit in the above-mentioned first aspect.

[0014] In a third aspect, an embodiment of the present application provides a vehicle, comprising: a dimming film disposed on a glass of the vehicle, and any one of the power supply circuits described in the first aspect above for supplying power to the dimming film.

[0015] Based on the above scheme, this application has the following beneficial effects:

[0016] The boost module, sampling module, dimming film and microcontroller in this power supply circuit are connected to the reference ground respectively, realizing physical electrical isolation, so that this power supply circuit will not have leakage phenomenon, each module will not have high voltage breakdown phenomenon, and the above power supply circuit will not have safety hazards due to leakage phenomenon. In addition, by collecting the electrical signals at the input and output ends of the dimming film, it is possible to further analyze whether there are some abnormal leakage conditions, such as leakage caused by the parasitic parameters of the outer shell of the dimming film, and when it is determined that there is leakage, the power supply to the dimming film is stopped, thereby improving the safety of the dimming film during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A A schematic diagram of module connection of a power supply circuit for an automobile film is shown;

[0018] Figure 1B A schematic diagram of a sampling circuit of a power supply circuit of an automobile film is shown;

[0019] Figure 2 According to an embodiment of the present application, a schematic diagram of module connection of a power supply circuit of an automobile film is shown;

[0020] Figure 3 According to an embodiment of the present application, a schematic diagram of module connection of another power supply circuit of an automobile film is shown;

[0021] Figure 4 According to an embodiment of the present application, a schematic structural diagram of a power supply circuit for an automobile film is shown;

[0022] Figure 5 According to an embodiment of the present application, a schematic diagram of a sampling circuit of an H-bridge driver chip is shown. DETAILED DESCRIPTION

[0023] Illustrative embodiments of the present application include, but are not limited to, a power supply circuit, a chip, and a vehicle.

[0024] It can be understood that the technical solution of the present application is applicable to devices requiring high voltage power supply, such as equipment with SPD film, etc.

[0025] As described in the background technology, automotive films such as SPD films have high-voltage working performance. It can be understood that the SPD film is a dimming film with suspended nanoparticles added. After the voltage is input, the nanoparticles in the SPD film layer can be arranged in different orientations according to the magnitude of the applied voltage, thereby adjusting the transparency of the automotive skylight glass to which the SPD film is attached. The input voltage can reach more than 60V.

[0026] Figure 1A FIG. 2 shows a schematic diagram of a module connection of a power supply circuit for an SPD film or other automotive film. Figure 1AAs shown, this power supply circuit includes a boost chip 001, a charge pump circuit 002, a microprocessor 003, a sampling circuit 004 and a high-voltage automotive film 005. The output end of the boost chip 001 is connected to the input end of the charge pump circuit 002, the output end of the charge pump circuit 002 is connected to the input end of the high-voltage automotive film 005, the output end of the high-voltage automotive film 005 is connected to the input end of the sampling circuit 004, the output end of the sampling circuit 004 is connected to the input end of the microprocessor 003, and the output end of the microprocessor 003 is connected to the input end of the boost chip 001.

[0027] Among them, the boost chip 001 and the corresponding charge pump circuit 002 are used to provide a higher voltage to the high-voltage automobile film 005, such as the SPD film, so as to change the transparency of the automobile skylight glass accordingly. In addition, the sampling circuit 005 is used to collect the instantaneous voltage at the output end of the high-voltage automobile film 005, and input the collected instantaneous voltage into the microprocessor 003 for calculation. If the instantaneous current output by the high-voltage automobile film 005 obtained by the microprocessor 003 through the instantaneous voltage and the sampling resistor in the sampling circuit 005 exceeds the current threshold, then the microprocessor 003 will control the boost chip 001 to stop supplying power to the high-voltage automobile film 005, thereby realizing the leakage detection of the high-voltage automobile film 005 during use, and improving the safety of the high-voltage automobile film 005 during use.

[0028] Specific Figure 1A The sampling circuit 004 in the embodiment can be Figure 1BAs shown. The input end of the sampling circuit 004 is connected to the output end of the high-voltage automobile film 005, and the sampling circuit may include a sampling resistor, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, an operational amplifier 1, an operational amplifier 2 and a microprocessor 003. Among them, the output end of the high-voltage automobile film 005 is respectively connected to the first end of the sampling resistor and the first end of the resistor R1, and the second end of the sampling resistor is grounded. In this way, the voltage across the sampling resistor is the instantaneous voltage of the high-voltage automobile film 005, that is, by collecting the voltage across the sampling resistor, the instantaneous voltage of the high-voltage automobile film 005 can be collected. The second end of the sampling resistor is also connected to the first end of the capacitor C1, the second end of the resistor R1 is connected to the second end of the capacitor C1, and the first end of the resistor R3 is connected to the output end of the test voltage. It can be understood that the size of the test voltage can be determined according to actual conditions. For example, exemplary, the test voltage can be 5V. The second end of the resistor R3 is connected to the second end of the capacitor C1, the second end of the capacitor C1 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the non-inverting input of the operational amplifier 1, the inverting input of the operational amplifier 1 is respectively connected to the first end of the resistor R5, the first end of the capacitor C2 and the first end of the resistor R4, the second end of the resistor R4 is grounded, the second end of the resistor R5 and the second end of the capacitor C2 are respectively connected to the output of the operational amplifier 1, the output of the operational amplifier 1 is also connected to the non-inverting input of the operational amplifier 2, the first end of the resistor R6 is grounded, the second end of the resistor R6 is respectively connected to the inverting input of the operational amplifier 2 and the first end of the resistor R7, the output of the operational amplifier 2 is respectively connected to the second end of the resistor R7 and the first end of the resistor R8, and the second end of the resistor R8 is connected to the input of the microprocessor.

[0029] Among them, operational amplifier 1 and operational amplifier 2 are used to amplify the collected instantaneous voltage output by the high-voltage automobile film 005, that is, the instantaneous voltage across the sampling resistor, and input it into the microprocessor 003. The microprocessor 003 is used to calculate the instantaneous current at the output end of the high-voltage automobile film 005 according to the instantaneous voltage and the resistance value of the sampling resistor, and when it is determined that the instantaneous current is greater than the preset current threshold, the boost chip 001 is controlled to stop supplying power to the high-voltage automobile film 005.

[0030] It can be understood that since the boost chip 001 cannot provide a higher voltage, the boost chip 001 is combined with the charge pump circuit 002, and the voltage output by the boost chip 001 is further increased by the charge pump circuit 002, so as to provide a higher voltage for the high-voltage automobile film 005 and meet the voltage requirements of the high-voltage automobile film 005. However, due to the power loss characteristics of the charge pump circuit 002 itself, there is a lot of output power loss, for example, the output power loss can be close to 50% of the rated power of the boost chip 001, and it is unable to provide the higher rated working power required by the automobile film, such as an output power of more than 13W.

[0031] and, Figure 1A and 1B The electronic components in the system are all connected to the real ground line, without physical electrical isolation, which may cause leakage. Figure 1B In the process of leakage detection of the high-voltage automobile film 005 by the sampling circuit in the circuit, there may be some software failures of the microprocessor, or the instantaneous voltage at the output end of the high-voltage automobile film 005 cannot be collected due to line failures, resulting in the hidden danger of high-voltage breakdown of the electronic components in this power supply circuit. Therefore, the use of the above power supply circuit still causes a large safety hazard in the operation of the high-voltage automobile film 005.

[0032] In view of this, the embodiments of the present application provide a power supply circuit, a chip and a vehicle. Figure 2 As shown, the output end of the power supply circuit is connected to the input end of the high-voltage glass film 108a, and can supply power to the high-voltage glass film 108a. The power supply circuit may include: a boost module 100, a sampling module 200 and a microcontroller 109a.

[0033] The boost module 100 may include a signal generating module 101a, an isolation transformer 102a, a filter switch module 104a and a signal feedback module 105a, and the sampling module 200 may include a first signal acquisition module 106a and a second signal acquisition module 107a. The output end of the signal generating module 101a is connected to the input end of the isolation transformer 102a, the output end of the isolation transformer 102a is connected to the first input end of the filter switch module 104a, the first output end of the filter switch module 104a is connected to the input end of the signal feedback module 105a, and the output end of the signal feedback module 105a is connected to the input end of the signal generating module 101a. The second output end of the filter switch module 104a is connected to the first input end of the first signal acquisition module 106a, the second input end of the first signal acquisition module 106a is connected to the input end of the high-pressure glass membrane 108a, the third output end of the filter switch module 104a is connected to the first input end of the second signal acquisition module 107a, the second input end of the second signal acquisition module 107a is connected to the output end of the high-pressure glass membrane 108a, the output end of the first signal acquisition module 106a and the output end of the second signal acquisition module 107a are respectively connected to the first input end and the second input end of the microcontroller 109a, and the output end of the microcontroller 109a is connected to the second input end of the filter switch module 104a.

[0034] In this way, the signal generating module 101a can output an initial voltage, and after the initial voltage is adjusted to a higher adjustment voltage through the isolation transformer 102a, it is filtered and converted into a power supply voltage through the filter switch module 104a, and then input into the high-voltage glass membrane 108a, thereby supplying power to the high-voltage glass membrane 108a. At the same time, the power supply voltage output by the filter switch module 104a will also be fed back to the signal generating module 101a through the signal feedback module 105a, and then, the initial voltage output by the signal generating module 101a can be adjusted to adjust the power supply voltage received by the high-voltage glass membrane 108a, thereby maintaining the working state of the high-voltage glass membrane 108a.

[0035] In addition, the first signal acquisition module 106a in the sampling module 200 is connected to the input end of the high-voltage glass membrane 108a, and the second signal acquisition module 107a in the sampling module 200 is connected to the output end of the high-voltage glass membrane 108a. In this way, the electrical signal at the input end of the high-voltage glass membrane 108a, such as the current signal, collected by the first signal acquisition module 106a in the sampling module 200 and the electrical signal at the output end of the high-voltage glass membrane 108a collected by the second signal acquisition module 107a in the sampling module 200 can be input into the microcontroller 109a. When the microcontroller 109a determines that the two collected electrical signals are abnormal, such as the electrical signal is a current signal, and the current collected at the output end is greater than the current collected at the input end, it indicates that the power supply circuit may have leakage. Then, the microcontroller 109a can control the filter switch module 104a to stop supplying power to the high-voltage glass membrane 108a, thereby improving the safety of the high-voltage glass membrane 108a during use.

[0036] In addition, the isolation transformer 102a is connected to the real ground and the reference ground, while the other modules are only connected to the reference ground. The secondary winding of the isolation transformer 102a is connected to the reference ground, but not to the real ground, so that physical electrical isolation can be achieved, resulting in no leakage in the power supply circuit. Therefore, the various modules in the above circuit will not have high voltage breakdown, and the above power supply circuit will not have safety hazards due to leakage.

[0037] It can be understood that the rated operating power of automotive films such as SPD films under high temperature conditions is usually required to be above 13W. Through the voltage transformation performance of the isolation transformer 102a, a higher power output can also be achieved, thereby providing the required higher power signals for these automotive films.

[0038] In one possible implementation, Figure 3 As shown, corresponding to Figure 2The signal generating module 101a may be a pulse width modulation (PWM) control module 101b, the isolation transformer 102a may be an isolation transformer 102b, the filtering switch module 104a may include a rectifying filtering module 103b and an H-bridge module 104b, the signal feedback module 105a may be a linear optocoupler isolator 105b, the first signal acquisition module 106a may be a first Hall sensor 106b, the second signal acquisition module 107a may be a second Hall sensor 107b, and the high-voltage glass film 108a may be a high-voltage glass film 108b. The input end of the PWM control module 101b is connected to the battery, the output end of the PWM control module 101b is connected to the input end of the isolation transformer 102b, the output end of the isolation transformer 102b is connected to the input end of the rectifier and filter module 103b, the first output end of the rectifier and filter module 103b is connected to the first input end of the H-bridge module 104b, the second output end of the rectifier and filter module 103b is connected to the input end of the linear optocoupler isolator 105b, the output end of the linear optocoupler isolator 105b is connected to the control end of the PWM control module 101b, and the first output end of the H-bridge module 104b is connected to the first Hall The first Hall sensor 106b is connected to the input end of the high-pressure glass membrane 108a, the second input end of the first Hall sensor 106b is connected to the input end of the high-pressure glass membrane 108a, the second output end of the H-bridge module 104b is connected to the first input end of the second Hall sensor 107b, the second input end of the second Hall sensor 107b is connected to the output end of the high-pressure glass membrane 108b, the output end of the first Hall sensor 106b is connected to the first input end of the microcontroller 109b, the output end of the second Hall sensor 107b is connected to the second input end of the microcontroller 109b, and the output end of the microcontroller 109b is connected to the second input end of the H-bridge module 104b.

[0039] It can be understood that the PWM control module 101b can convert the DC voltage provided by the battery (exemplarily, the DC voltage can be 12V) into a rectangular pulse voltage signal, that is, an initial voltage, and input it into the isolation transformer 102b. The isolation transformer 102b may include a primary winding and two secondary windings. Among them, the primary winding can generate an AC voltage signal based on the input rectangular pulse voltage signal. The first secondary winding can generate a first adjustment voltage based on this AC voltage signal, and then filter it through the rectifier and filter module 103b, and convert the first adjustment voltage (AC) into a first power supply voltage (DC), and output the first power supply voltage to the high-voltage glass film 108b through the switching action of the H-bridge module 104b. The second secondary winding can generate a second adjustment voltage based on this AC voltage signal, and then filter it through the rectifier and filter module 103b, and convert the second adjustment voltage (AC) into a second power supply voltage (DC), and then power the H-bridge module 104b and the microcontroller 109b. In addition, the rectifier filter module 103b also feeds back the first power supply voltage to the PWM control module 101b through the linear optocoupler isolator 105b, so the PWM control module 101b can adjust the duty cycle of the PWM signal and adjust the initial voltage, thereby achieving the effect of providing stable power supply to the high-voltage glass film 108b. It can be understood that through the voltage transformation performance of the isolation transformer 102b, a higher power output can be achieved to meet the needs of the automotive film.

[0040] It can be understood that the current signal at the input end of the high-voltage glass membrane 108b collected by the first Hall sensor 106b and the current signal at the output end of the high-voltage glass membrane 108b collected by the second Hall sensor 107b are both of high accuracy. If the microcontroller 109b determines that the two collected current signals are not equal, the microcontroller 109b can stop supplying power to the high-voltage glass membrane 108b through the switching action of the H-bridge module 104b, thereby improving the safety of the power supply circuit.

[0041] It can be understood that the isolation transformer 102b has both a first ground terminal for connecting to the real ground line and a second ground terminal connected to the reference ground, while the other modules only have a second ground terminal connected to the reference ground. The second secondary winding and the third secondary winding of the isolation transformer 102b are connected to the reference ground through the second ground terminal, respectively, to achieve physical electrical isolation. Therefore, this power supply circuit will not generate leakage in the process of supplying power to the high-voltage glass membrane 108b.

[0042] Therefore, each module in the above power supply circuit will not experience high voltage breakdown, nor will there be any safety hazard due to leakage.

[0043] The above power supply circuit can achieve higher power output through the isolation transformer 102b, and no leakage will occur, thereby improving the overall safety performance.

[0044] In one possible implementation, Figure 4 Shows the corresponding Figure 3 The specific structural diagram of the module of the power supply circuit shown in FIG. Figure 4 As shown, the PWM control module 101b may include a PWM chip, a metal oxide semiconductor field effect transistor (MOSFET) Q01, a MOSFET tube Q02, a resistor R11, a capacitor C3, a resistor R12 and a capacitor C4; the isolation transformer 102b includes a primary winding and two secondary windings; the rectifier filter module 103b may include a diode D1, a diode D2, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2 and a rectifier circuit D3, the H-bridge module 104b may include an H-bridge chip, an iron core inductor L4 and a capacitor C4, the H-bridge chip may include an H-bridge driver chip and four MOSFET tubes, the linear optocoupler isolator 105b may include a linear optocoupler isolator chip, a resistor R13 and a resistor R14, the first Hall sensor 106b includes a first Hall sensor chip and a resistor R15, and the second Hall sensor 107b includes a second Hall sensor chip and a resistor R16.

[0045] Among them, the N12 pin of the primary winding of the isolation transformer 102b is connected to the battery voltage, the N11 pin and the N13 pin of the primary winding are respectively connected to the drain of the MOSFET tube Q01 and the drain of the MOSFET tube Q02, the gates of the MOSFET tube Q01 and the MOSFET tube Q02 are respectively connected to the two output ends of the PWM chip, and the power supply provides a 12V DC voltage to the PWM chip and the N12 pin of the primary winding of the isolation transformer 102b. The N21 pin of the secondary winding of the isolation transformer 102b is connected to the input end of the diode D1, the N23 pin of the secondary winding is connected to the input end of the diode D2, the output end of the diode D1 and the output end of the diode D2 are respectively connected to the input end of the inductor L1, the output end of the inductor L1 is respectively connected to the first end of the capacitor C1 and the first input end of the H-bridge chip, the N22 pin of the secondary winding of the isolation transformer 102b is connected to the second end of the capacitor C1, and the second end of the capacitor C1 is connected to the reference ground through the second grounding terminal. Pins N31 and N34 of the secondary winding of the isolation transformer 102b are respectively connected to the first input terminal and the second input terminal of the rectifier circuit D3, the output terminal of the rectifier circuit D3 is connected to the input terminal of the inductor L2, the output terminal of the inductor L2 is respectively connected to the first terminal of the capacitor C2 and the second input terminal of the H-bridge chip, the third input terminal of the rectifier circuit D3 is connected to the second terminal of the capacitor C2, and the second terminal of the capacitor C2 is connected to the reference ground through the second ground terminal.

[0046] The first end of the capacitor C1 is also connected to the first end of the resistor R3, the second end of the resistor R3 is respectively connected to the input end of the linear optocoupler chip and the first end of the resistor R4, the output end of the linear optocoupler chip and the second end of the resistor R4 are respectively connected to the reference ground through the second grounding end, the output end of the linear optocoupler chip is also connected to the error amplifier compensation pin (COMP pin) of the PWM chip, and is connected to the real ground through the first grounding end. The first output end of the H-bridge chip is connected to the input end of the iron core inductor L4, the output end of the iron core inductor L4 is respectively connected to the first end of the capacitor C4 and the second output end of the H-bridge chip, the first end of C4 is also connected to the input end of the first Hall sensor chip, the output end of the first Hall sensor chip is connected to the first end of the resistor R15, the second end of the resistor R15 is connected to the input end of the high-voltage glass film 108b, the second end of the capacitor C4 is also connected to the input end of the second Hall sensor chip, the output end of the second Hall sensor chip is connected to the first end of the resistor R16, and the second end of the resistor R16 is connected to the output end of the high-voltage glass film 108b. The output end of the first Hall sensor chip and the output end of the second Hall sensor chip are also connected to the first input end and the second input end of the microcontroller 109b, respectively, and the output end of the microcontroller 109b is connected to the third input end of the H-bridge chip. It can be understood that the resistors R3 and R4 in the linear optocoupler isolator 105b can play a role in dividing the voltage of the linear optocoupler isolator chip to prevent the linear optocoupler isolator chip from being damaged by excessive voltage.

[0047] It can be understood that the PWM chip converts the 12V DC voltage provided by the power supply into a rectangular pulse voltage signal, that is, the initial voltage, according to the preset duty cycle and frequency, and inputs the N11 pin and the N13 pin of the primary winding of the isolation transformer 102b. The primary winding can generate an alternating magnetic field based on the input rectangular pulse voltage signal, that is, an AC voltage signal. The first secondary winding senses the alternating magnetic field, and a higher voltage signal is generated between the N21 pin and the N22 pin of the first secondary winding, that is, the first adjustment voltage, and then the first adjustment voltage (AC) is converted into the first supply voltage (DC) through the filter circuit composed of the diode D1, the inductor L1 and the capacitor C1 in the rectifier filter module 103b. The first supply voltage is output to the high-voltage glass film 108b through the switching action of the H-bridge chip.

[0048] It can be understood that the relationship between the input voltage and output voltage of the isolation transformer can be: Vout = 2Vin×D×Ns / Np, Vout is the output voltage, Vin is the input voltage, D is the duty cycle of the input voltage, Ns is the number of turns of the secondary winding, and Np is the number of turns of the primary winding.

[0049] In addition, the second secondary winding between the N31 pin and the N32 pin of the secondary winding of the isolation transformer 102b will also generate a second adjustment voltage based on the AC voltage signal generated by the aforementioned primary winding, and then the second adjustment voltage (AC) is converted into a second power supply voltage (DC) through the filter circuit composed of the rectifier circuit D3, the inductor L2 and the capacitor C2 in the rectifier filter module 103b, and output from the output end of the second secondary winding, thereby supplying power to electronic components such as the H-bridge chip and the microcontroller 109b. Among them, the iron core inductor L4 and the capacitor C4 in the H-bridge module 104b can convert the square wave signal of the first power supply voltage input to the H-bridge module 104b into a sine wave signal of the first power supply voltage, and provide the sine wave signal of the first power supply voltage to the high-voltage glass film 108b.

[0050] In a possible implementation, in order to prevent a short circuit between the first output terminal and the second output terminal of the H-bridge chip, a Figure 5 The acquisition circuit at the output end of the H-bridge chip shown in the figure performs acquisition detection. Figure 5As shown, this acquisition circuit includes resistor R7, resistor R8, resistor R9, resistor R10, operational amplifier 3, resistor R11, resistor R12 and resistor R13. Among them, the first end of resistor R7 is connected to the first output end of the H-bridge chip, the first end of resistor R8 is connected to the second output end of the H-bridge chip, the second end of resistor R7 is respectively connected to the first end of resistor R9 and the in-phase input end of operational amplifier 3, the first end of resistor R9 is connected to the 5V test voltage, the second end of resistor R8 is connected to the inverting input end of operational amplifier 3, the second end of resistor R9 is connected to the first end of resistor R10, the second end of resistor R10 is connected to the reference ground through the second grounding end, the reverse output end of operational amplifier 3 is also connected to the first end of resistor R11, the second end of resistor R11 is respectively connected to the first end of resistor R13 and the output end of operational amplifier 3, the reverse output end of operational amplifier 3 is also connected to the first end of resistor R12, the second end of resistor R12 is respectively connected to the first end of resistor R13 and the output end of operational amplifier 3, and the second end of resistor R13 is connected to the third input end of microcontroller 109b.

[0051] It can be understood that the electrical signals, such as voltage signals, at the first output terminal and the second output terminal of the H-bridge chip can be collected, and the two collected electrical signals can be respectively input into the in-phase input terminal and the inverting input terminal of the operational amplifier 3 for amplification. Finally, the electrical signals at the first output terminal and the second output terminal can be analyzed and determined by the microcontroller 109b, such as voltage equality, to determine whether a short circuit occurs between the first output terminal and the second output terminal of the H-bridge chip. By determining that the voltages at the first output terminal and the second output terminal are not equal, it can be determined that no short circuit occurs between the first output terminal and the second output terminal of the H-bridge chip. When it is determined that a short circuit occurs between the first output terminal and the second output terminal of the H-bridge chip, the H-bridge chip can be controlled by the microcontroller 109b so that the power supply circuit no longer supplies power to the high-voltage glass membrane 108b, thereby improving the safety of the power supply circuit.

[0052] It can be understood that the resistor R15 in the first Hall sensor 106b can play a role of voltage division for the first Hall sensor chip, and the resistor R16 in the second Hall sensor 107b can play a role of voltage division for the second Hall sensor chip, so as to prevent the first Hall sensor chip and the second Hall sensor chip from being damaged by excessive voltage. It can be understood that the sampling accuracy of the first Hall sensor chip and the second Hall sensor chip is relatively high. Therefore, the sampling accuracy of the power supply circuit can be improved by using the first Hall sensor chip and the second Hall sensor chip to collect the current signals at the input and output ends of the high-voltage glass film 108b.

[0053] It can be understood that the isolation transformer 102b is connected to both the real ground wire and the reference ground, and the second secondary winding and the third secondary winding of the isolation transformer 102b are respectively connected to the reference ground, thereby achieving physical electrical isolation. Therefore, when the power supply circuit is supplying power to the high-voltage glass film 108b, no leakage will occur, and the various modules in the above circuit will not experience high-voltage breakdown, nor will there be any safety hazards due to leakage.

[0054] The above-mentioned power supply circuit can not only achieve a relatively high power output through an isolation transformer to meet the high power requirements of the high-voltage glass film, but also avoid leakage by connecting the two secondary windings of the isolation transformer to the reference ground, thereby improving the safety of the power supply circuit. At the same time, by collecting electrical signals at the output end of the H-bridge chip, such as voltage signals and / or current signals, the H-bridge chip can be controlled to stop supplying power to the high-voltage glass film when a short circuit occurs at the output end of the H-bridge chip, thereby further improving the safety of the power supply circuit.

[0055] It should be noted that in the examples and description of this patent, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes one" does not exclude the presence of other identical elements in the process, method, article or device including the element. Although the present application has been illustrated and described with reference to certain preferred embodiments of the present application, it should be understood by those skilled in the art that various changes may be made to it in form and detail without departing from the spirit and scope of the present application.

Claims

1. A power supply circuit for supplying power to a dimming film, characterized in that: The power supply circuit includes: a boost module, a sampling module and a microcontroller, the boost module, the sampling module, the dimming film and the microcontroller are respectively connected to a reference ground, and the sampling module includes a first signal acquisition module and a second signal acquisition module; The input end of the boost module is connected to a battery, the first output end of the boost module is connected to the first input end of the first signal acquisition module, the second input end of the first signal acquisition module is connected to the input end of the dimming film, the output end of the first signal acquisition module is connected to the first input end of the microcontroller, the output end of the dimming film is connected to the first input end of the second signal acquisition module, the second input end of the second signal acquisition module is connected to the second output end of the boost module, the output end of the second signal acquisition module is connected to the second input end of the microcontroller, and the output end of the microcontroller is connected to the control end of the boost module; The boost module generates a power supply voltage based on the power supply voltage provided by the battery, and the power supply voltage is used to power the dimming film; The first signal acquisition module is used to acquire the electrical signal of the input end of the dimming film, and the second signal acquisition module is used to acquire the electrical signal of the output end of the dimming film; The microcontroller is used to control the boost module to supply power to the dimming film according to the electrical signal at the input end and the electrical signal at the output end.

2. The power supply circuit according to claim 1, characterized in that: The boost module comprises an isolation transformer, and a secondary winding of the isolation transformer is connected to a reference ground.

3. The power supply circuit according to claim 2, characterized in that: The boost module further includes a signal generating module, which is used to convert the power supply voltage provided by the battery into an initial voltage and input the initial voltage into the isolation transformer, wherein the initial voltage includes a rectangular pulse voltage signal.

4. The power supply circuit according to claim 3, characterized in that: The boost module includes a signal feedback module, which feeds back the supply voltage to the signal generating module, and the signal generating module adjusts the supply voltage according to the supply voltage and outputs the adjusted supply voltage.

5. The power supply circuit according to claim 2, characterized in that: The boost module further includes a filter switch module, which is used to convert the AC adjustment voltage generated by the secondary winding of the isolation transformer into a DC supply voltage.

6. The power supply circuit according to claim 5, characterized in that: The isolation transformer includes a primary winding and two secondary windings, wherein the primary winding is used to generate an AC voltage signal according to a received initial voltage, and the first secondary winding of the two secondary windings is used to generate a first adjustment voltage according to the AC voltage signal, and the first adjustment voltage is converted into a first supply voltage through the filter switch module, and the first supply voltage is used to power the dimming film.

7. The power supply circuit according to claim 6, characterized in that: The second secondary winding of the two secondary windings is used to generate a second adjustment voltage according to the AC voltage signal, and the second adjustment voltage is converted into a second power supply voltage through the filter switch module, and the second power supply voltage is used to power the filter switch module and the microcontroller.

8. The power supply circuit according to claim 4, characterized in that: The signal feedback module includes a linear optocoupler isolator, and the first signal acquisition module and the second signal acquisition module include Hall sensors.

9. A chip, characterized in that: The chip includes the power supply circuit according to any one of claims 1 to 8.

10. A vehicle, characterized in that: include: A dimming film disposed on the glass of the vehicle, and a power supply circuit for supplying power to the dimming film according to any one of claims 1 to 8.

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