Boost circuit and power supply device

Abstract

The utility model discloses a boosted circuit and a power supply device, the boosted circuit comprises a voltage conversion circuit and a pulse width modulation circuit, the first end of the voltage conversion circuit is the input end of the boosted circuit, the second end of the voltage conversion circuit is the output end of the boosted circuit, and the first end of the pulse width modulation circuit is connected with the first end of the voltage conversion circuit. The second end of the pulse width modulation circuit is connected with the third end of the voltage conversion circuit; the pulse width modulation circuit is used for providing a first control signal for the voltage conversion circuit; the voltage conversion circuit is used for converting the first direct-current electric signal into a second direct-current electric signal according to the first control signal, and the voltage of the first direct-current electric signal is smaller than that of the second direct-current electric signal. According to the embodiment of the invention, the problem of voltage attenuation of the power supply in the transmission process can be solved, so that the stable work of the rear-end terminal is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a boost circuit and a power supply device. Background Art

[0002] In electronic systems and equipment, stable transmission of power is crucial. In order to achieve long-distance power supply, the power supply needs to supply power to the back-end terminal through the transmission line, such as supplying power to the light source drive center and backup light source through the transmission line. However, due to the existence of impedance, when supplying power to the back-end terminal through the transmission line, the power supply will experience voltage attenuation during the transmission process. When the voltage attenuates to a certain extent, it cannot meet the stable operation of the back-end terminal. Utility Model Content

[0003] The embodiments of the present application disclose a boost circuit and a power supply device for increasing the voltage of a direct current signal so that the voltage can meet the stable operation of a back-end terminal.

[0004] In a first aspect, an embodiment of the present application discloses a boost circuit, including a voltage conversion circuit and a pulse width modulation circuit, wherein:

[0005] The first end of the voltage conversion circuit is the input end of the boost circuit, the second end of the voltage conversion circuit is the output end of the boost circuit, the first end of the pulse width modulation circuit is connected to the first end of the voltage conversion circuit, and the second end of the pulse width modulation circuit is connected to the third end of the voltage conversion circuit;

[0006] A pulse width modulation circuit, used for providing a first control signal to the voltage conversion circuit;

[0007] The voltage conversion circuit is used to convert a first direct current signal into a second direct current signal according to a first control signal, wherein the voltage of the first direct current signal is smaller than the voltage of the second direct current signal.

[0008] In a second aspect, an embodiment of the present application discloses a power supply device, comprising a first transmission line device, a second transmission line device and a boost circuit as in the first aspect, wherein: one end of the first transmission line device is an input end of the power supply device, the other end of the first transmission line device is connected to the input end of the boost circuit, the output end of the boost circuit is connected to one end of the second transmission line device, and the other end of the second transmission line device is an output end of the power supply device.

[0009] In the embodiment of the present application, the boost circuit includes a voltage conversion circuit and a pulse width modulation circuit, the first end of the voltage conversion circuit is the input end of the boost circuit, the second end of the voltage conversion circuit is the output end of the boost circuit, the first end of the pulse width modulation circuit is connected to the first end of the voltage conversion circuit, and the second end of the pulse width modulation circuit is connected to the third end of the voltage conversion circuit; the pulse width modulation circuit is used to provide a first control signal to the voltage conversion circuit; the voltage conversion circuit is used to convert the first direct current signal into a second direct current signal according to the first control signal, and the voltage of the first direct current signal is less than the voltage of the second direct current signal. It can be seen that the pulse width modulation circuit is connected to the voltage conversion circuit, and the pulse width modulation circuit can provide the voltage conversion circuit with a first control signal, and the voltage conversion circuit can convert the first direct current signal with a lower voltage into the second direct current signal with a higher voltage according to the first control signal, which can solve the problem of voltage attenuation of the power supply during transmission, thereby ensuring the stable operation of the back-end terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 It is a structural schematic diagram of a power supply system disclosed in an embodiment of the present application;

[0012] Figure 2 It is a structural schematic diagram of a boost circuit disclosed in an embodiment of the present application;

[0013] Figure 3 It is a structural schematic diagram of another boost circuit disclosed in an embodiment of the present application;

[0014] Figure 4 It is a structural schematic diagram of another boost circuit disclosed in an embodiment of the present application;

[0015] Figure 5 is a schematic diagram of the structure of a voltage conversion circuit disclosed in an embodiment of the present application;

[0016] Figure 6 is a structural schematic diagram of another voltage conversion circuit disclosed in an embodiment of the present application;

[0017] Figure 7 It is a structural schematic diagram of another voltage conversion circuit disclosed in an embodiment of the present application;

[0018] Figure 8 It is a structural schematic diagram of another voltage conversion circuit disclosed in an embodiment of the present application;

[0019] Fig. 9 It is a structural schematic diagram of another boost circuit disclosed in an embodiment of the present application;

[0020] Fig.10 It is a structural schematic diagram of a pulse width modulation circuit disclosed in an embodiment of the present application;

[0021] Fig.11 It is a structural schematic diagram of a slow start circuit disclosed in an embodiment of the present application;

[0022] Fig.12 It is a structural schematic diagram of a power supply circuit disclosed in an embodiment of the present application;

[0023] Fig.13 It is a structural schematic diagram of a power supply device disclosed in an embodiment of the present application;

[0024] Fig.14 It is a structural schematic diagram of a transmission line device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0026] The embodiment of the present application discloses a boost circuit and a power supply device, which are used to increase the voltage of a direct current signal so that the voltage can meet the stable operation of a back-end terminal.

[0027] In order to better understand the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below.

[0028] See also Figure 1 , Figure 1 Schematic diagram of a power supply system disclosed in the embodiment of the present application. Figure 1 As shown, the power supply system may include a power supply, a transmission line and a back-end terminal, and the power supply supplies power to the back-end terminal through the transmission line. Due to the existence of impedance, voltage attenuation will occur during the transmission of the power supply through the transmission line. When the transmission distance is too long, the transmission voltage attenuates to a certain extent and cannot meet the stable operation or other requirements of the back-end terminal. For example, when the back-end terminal is a light source, the transmission distance is too long, and the transmission voltage attenuates to a certain extent, the light source will have abnormal phenomena such as light source color difference, flashing, etc.

[0029] In order to solve the above problems, the present application designs a boost circuit, which can increase the voltage of the DC signal through a voltage conversion circuit so that the voltage can meet the stable operation of the back-end terminal.

[0030] See also Figure 2, Figure 2 Schematic diagram of a boost circuit disclosed in an embodiment of the present application. Figure 2 As shown, the boost circuit may include a voltage conversion circuit and a pulse width modulation circuit.

[0031] The first end of the voltage conversion circuit is the input end of the boost circuit, the second end of the voltage conversion circuit is the output end of the boost circuit, the first end of the pulse width modulation circuit is connected to the first end of the voltage conversion circuit, and the second end of the pulse width modulation circuit is connected to the third end of the voltage conversion circuit.

[0032] The power input end of the boost circuit can receive a first DC signal, and then the pulse width modulation circuit can provide a first control signal according to the first DC signal, that is, the pulse width modulation circuit starts working after receiving the first DC signal, and provides the first control signal to the voltage conversion circuit. The voltage conversion circuit can convert the first DC signal into a second DC signal according to the first control signal. The voltage of the first DC signal is less than the voltage of the second DC signal. Due to the existence of impedance, when the rear-end terminal is powered through the transmission line, the power supply will experience voltage attenuation during the transmission process. In order to provide a suitable DC voltage for the rear-end terminal, the voltage conversion circuit can convert the low-voltage DC signal into a DC signal of the voltage required by the rear-end terminal. The rear-end terminal can be a light-emitting device, or it can be other devices or equipment that need to be powered.

[0033] It should be understood that the connection in the present application may be an electrical connection.

[0034] exist Figure 2 In the described boost circuit, the boost circuit includes a voltage conversion circuit and a pulse width modulation circuit, the first end of the voltage conversion circuit is the input end of the boost circuit, the second end of the voltage conversion circuit is the output end of the boost circuit, the first end of the pulse width modulation circuit is connected to the first end of the voltage conversion circuit, and the second end of the pulse width modulation circuit is connected to the third end of the voltage conversion circuit; the pulse width modulation circuit is used to provide a first control signal to the voltage conversion circuit; the voltage conversion circuit is used to convert the first DC signal into a second DC signal according to the first control signal, and the voltage of the first DC signal is less than the voltage of the second DC signal. It can be seen that the pulse width modulation circuit is connected to the voltage conversion circuit, and the pulse width modulation circuit can provide the voltage conversion circuit with a first control signal, and the voltage conversion circuit can convert the first DC signal with a lower voltage into the second DC signal with a higher voltage according to the first control signal, which can solve the problem of voltage attenuation of the power supply during transmission, thereby ensuring the stable operation of the back-end terminal.

[0035] It should be understood that when voltage transmission is required between two devices, there may be one boosting circuit or multiple boosting circuits between them.

[0036] In some embodiments, after the voltage conversion circuit converts the first DC signal into the second DC signal according to the first control signal, that is, after the voltage conversion circuit generates the output voltage, the voltage conversion circuit may further provide a feedback signal to the pulse width modulation circuit.

[0037] The pulse width modulation circuit can determine or generate a first control signal according to the feedback signal, and then provide the first control signal to the voltage conversion circuit, so that the voltage conversion circuit can output a stable signal according to the first control signal.

[0038] Since the voltage conversion circuit and the pulse width modulation circuit form a closed loop through the feedback signal and the control signal, the accuracy and stability of the output voltage of the voltage conversion circuit can be ensured.

[0039] See also Figure 3 , Figure 3 is a schematic diagram of the structure of another boost circuit disclosed in the embodiment of the present application. Figure 3 As shown, the boost circuit may further include a slow start circuit.

[0040] The input end of the slow start circuit is the input end of the boost circuit, and the output end of the slow start circuit is respectively connected to the first end of the voltage conversion circuit and the first end of the pulse width modulation circuit.

[0041] The soft start circuit can filter the overshoot voltage in the first DC signal to obtain a third DC signal. The voltage conversion circuit can convert the third DC signal into a second DC signal according to the first control signal, and the voltage of the third DC signal is lower than the voltage of the second DC signal.

[0042] The soft start circuit can filter the surge overshoot voltage of the input signal, realize the surge protection of the boost circuit, avoid the boost circuit from being damaged due to surge, and thus improve the safety of the boost circuit.

[0043] See also Figure 4 , Figure 4 is a schematic diagram of the structure of another boost circuit disclosed in the embodiment of the present application. Figure 4 As shown, the boost circuit may further include a power supply circuit.

[0044] The input end of the power supply circuit is connected to the first end of the voltage conversion circuit, and the output end of the power supply circuit is connected to the first end of the pulse width modulation circuit.

[0045] The power supply circuit can convert the first direct current signal into a fourth direct current signal, and the voltage of the fourth direct current signal is a preset voltage.

[0046] The pulse width modulation circuit can provide a first control signal to the voltage conversion circuit according to the fourth direct current signal.

[0047] The power supply circuit can provide a stable input voltage for the pulse width modulation circuit, thereby ensuring that the pulse width modulation circuit works stably.

[0048] See also Figure 5 , Figure 5 Schematic diagram of a voltage conversion circuit disclosed in an embodiment of the present application. Figure 5 As shown, the voltage conversion circuit may include a first switching device Q1, a first inductor L1, a first diode D1 and a voltage dividing module.

[0049] The first end of the first switch device Q1 is connected to the second end of the pulse width modulation circuit, the second end of the first switch device Q1 is respectively connected to one end of the first inductor L1 and the positive electrode of the first diode D1, the other end of the first inductor L1 is the input end of the boost circuit, the negative electrode of the first diode D1 is connected to one end of the voltage divider module, the other end of the voltage divider module and the third end of the first switch device Q1 are respectively connected to the ground, and the two ends of the voltage divider module are the output ends of the boost circuit.

[0050] The voltage divider module can provide a feedback signal for the pulse width modulation circuit.

[0051] The first switch device Q1 may be a metal oxide semiconductor (MOS) tube, or other devices with equivalent functions.

[0052] When the first switch device Q1 is a MOS tube, the gate of the MOS tube is the first end of the first switch device Q1, the drain of the MOS tube is the second end of the first switch device Q1, and the source of the MOS tube is the third end of the first switch device Q1.

[0053] The first diode D1 may be a Schottky diode or other devices with equivalent functions.

[0054] The first control signal is a pulse width modulation (PWM) signal. When the PWM signal is at a high level, the MOS tube is turned on, the first DC signal passes through the first inductor L1, and the first inductor L1 starts to store energy. Since the anode of the first diode D1 is connected to the drain of the MOS tube, when the MOS tube Q1 is turned on, the anode potential of the first diode D1 is lower than the cathode potential, and at this time, the first DC signal cannot pass.

[0055] When the PWM signal is at a low level, the MOS tube is turned off. Since the anode of the first diode D1 is connected to the drain of the MOS tube, when the MOS tube Q1 is turned off, the anode potential of the first diode D1 is higher than the cathode potential, the first diode D1 starts to conduct, the first inductor L1 starts to discharge, and the second DC signal is output to the voltage divider module through the first diode D1, and energy is provided to the back-end terminal. That is, the first inductor L1 releases energy to the voltage divider module, so that the output voltage is higher than the input voltage.

[0056] See also Figure 6 , Figure 6 is a schematic diagram of another voltage conversion circuit disclosed in an embodiment of the present application. Figure 6 The voltage conversion circuit shown consists of Figure 5 The voltage conversion circuit shown is optimized. Figure 6 As shown, the voltage conversion circuit may further include a first resistor R1 and a second resistor R2.

[0057] The first terminal of the first switch device Q1 is connected to the second terminal of the pulse width modulation circuit through the first resistor R1. The first terminal of the first switch device Q1 is connected to the ground terminal through the second resistor R2.

[0058] The first resistor R1 can limit the current flowing through the loop where the first resistor R1 and the second resistor R2 are located, and can prevent the voltage drop on the second resistor R2 from being too large, so that the first switch device Q1 is damaged due to the excessive voltage between the first terminal and the third terminal.

[0059] The second resistor R2 is a pull-down resistor, which can provide a voltage to the first end of the first switch device Q1 when the PWM signal is at a high level, so that the first switch device Q1 is turned on.

[0060] See also Figure 7 , Figure 7 is a schematic diagram of the structure of another voltage conversion circuit disclosed in the embodiment of the present application. Figure 7 The signal enhancement circuit shown consists of Figure 6 The voltage conversion circuit shown is optimized. Figure 7 As shown, the voltage conversion circuit may further include a first filtering module and a second filtering module.

[0061] One end of the first filter module is connected to the other end of the first inductor L1, and the other end of the first filter module is connected to the ground. The second filter module is connected in parallel with the voltage divider module.

[0062] The first filtering module can filter high-frequency noise to ensure signal stability.

[0063] The second filter module can filter high-frequency noise and can also serve as an energy storage module. When the PWM signal is at a high level, that is, when the MOS tube is turned on, it stores energy. At the same time, when the external signal changes too quickly, it can compensate for the voltage.

[0064] See also Figure 8 , Figure 8 is a schematic diagram of the structure of another voltage conversion circuit disclosed in the embodiment of the present application. Figure 8 The signal enhancement circuit shown consists of Figure 7 The voltage conversion circuit shown is optimized. Figure 8 As shown, the voltage divider module may include a sixth resistor R6 and a seventh resistor R7. One end of the sixth resistor R6 is connected to the cathode of the first diode, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the ground.

[0065] The seventh resistor R3 may include one resistor or multiple resistors. When the seventh resistor R7 includes multiple resistors, the seventh resistor R7 may be formed by connecting the multiple resistors in series.

[0066] The first filtering module may include a second capacitor C2 and a third capacitor C3.

[0067] Among them, the second capacitor C2 can be a capacitor with a capacitance value range from microfarad level to millifarad level, which can filter out low-frequency noise, smooth the lower frequency components in the voltage ripple, and provide a larger energy storage for the circuit, thereby maintaining voltage stability when the instantaneous load changes.

[0068] The third capacitor C3 may have a capacitance value ranging from pico-farad level to nano-farad level, which can filter out high-frequency noise, process higher-frequency spikes, and respond quickly to high-frequency changes.

[0069] It should be understood that the second capacitor C2 may include one capacitor or multiple capacitors. When the second capacitor C2 includes multiple capacitors, the second capacitor C2 may be formed by connecting the multiple capacitors in parallel. The third capacitor C3 may include one capacitor or multiple capacitors. When the third capacitor C3 includes multiple capacitors, the third capacitor C3 may be formed by connecting the multiple capacitors in parallel.

[0070] The second filtering module may include a fourth capacitor C4 and a fifth capacitor C5.

[0071] Among them, the fourth capacitor C4 can be a capacitor with a capacitance value range from microfarad level to millifarad level, which can filter out low-frequency noise, smooth the lower frequency components in the voltage ripple, and provide a larger energy storage for the circuit, thereby maintaining voltage stability when the instantaneous load changes.

[0072] The fifth capacitor C5 may have a capacitance value ranging from pico-farad level to nano-farad level, and can filter out high-frequency noise, process higher-frequency spikes, and respond quickly to high-frequency changes.

[0073] It should be understood that the fourth capacitor C4 may include one capacitor or multiple capacitors. In the case where the fourth capacitor C4 includes multiple capacitors, the fourth capacitor C4 may be formed by connecting the multiple capacitors in parallel. The fifth capacitor C5 may include one capacitor or multiple capacitors. In the case where the fifth capacitor C5 includes multiple capacitors, the fifth capacitor C5 may be formed by connecting the multiple capacitors in parallel.

[0074] See also Fig. 9 , Fig. 9 is a schematic diagram of the structure of another boost circuit disclosed in the embodiment of the present application. Fig. 9 As shown, the pulse width modulation circuit may include a modulation module and an amplification module.

[0075] The first end of the modulation module is connected to the first end of the voltage conversion circuit, the second end of the modulation module is connected to the first end of the amplification module, the second end of the amplification module is connected to the third end of the voltage conversion circuit, and the third end of the modulation module is connected to the fourth end of the voltage conversion module.

[0076] The modulation module may generate a second control signal according to the feedback signal.

[0077] The amplification module can amplify the second control signal to obtain the first control signal.

[0078] In some embodiments, the modulation module may include a switching power supply pulse width modulation control chip. The switching power supply pulse width modulation control chip may be a chip having a function of generating a second control signal according to a feedback signal. For example, see Fig.10 , Fig.10 : is a schematic diagram of a pulse width modulation circuit disclosed in an embodiment of the present application. Fig.10 The pulse width modulation circuit shown consists of Fig. 9 The pulse width modulation circuit shown is optimized. Fig.10 The following description is made by taking the switching power supply pulse width modulation control chip model AiP494SA16 or TL494 as an example.

[0079] like Fig.10 As shown, the modulation module may include a switching power supply pulse width modulation control chip of model AiP494SA16, resistors R8-R15, and capacitors C6-C12.

[0080] The switching power supply pulse width modulation control chip may include a first pin 1, a second pin 2, a third pin 3, a fourth pin 4, a fifth pin 5, a sixth pin 6, a seventh pin 7, an eighth pin 8, a ninth pin 9, a tenth pin 10, an eleventh pin 11, a twelfth pin 12, a thirteenth pin 13, a fourteenth pin 14, a fifteenth pin 15 and a sixteenth pin 16.

[0081] The first pin 1 is the non-inverting input terminal of the first error amplifier of the switching power supply pulse width modulation control chip.

[0082] The second pin 2 is the inverting input terminal of the first error amplifier of the switching power supply pulse width modulation control chip. A fixed reference voltage can be provided to the switching power supply pulse width modulation control chip through the second pin 2. A feedback voltage is formed by voltage division by the eighth resistor R8 and the ninth resistor R9, and is sent to the error amplifier after being compared with the reference voltage.

[0083] The third pin 3 is the feedback input terminal of the switching power supply pulse width modulation control chip. The third pin 3 is used to receive a feedback signal. The ninth resistor R9 and the sixth capacitor R6 form a filter network, which can smooth the feedback signal of the third pin 3.

[0084] The fourth pin 4 is the input end of the error comparator of the switching power supply pulse width modulation control chip. The value set by the tenth resistor R10 is input to the fourth pin 4 to adjust the dead time between the output signals of the switching power supply pulse width modulation control chip.

[0085] The fifth pin 5 is the input terminal of the oscillating capacitor of the switching power supply pulse width modulation control chip, and the seventh capacitor C7 is the timing capacitor of the oscillator.

[0086] The sixth pin 6 is the input end of the oscillating resistor of the switching power supply pulse width modulation control chip, and the eleventh resistor R11 is the timing resistor of the oscillator.

[0087] The sixth resistor and the seventh resistor are connected to the external seventh capacitor C7 and the eleventh resistor R11 to form an internal oscillator circuit of the switching power supply pulse width modulation control chip. The user can customize the oscillation frequency of the internal oscillator circuit and control the frequency of the output pulse width modulation signal.

[0088] The seventh pin 7 is a ground pin of the switching power supply pulse width modulation control chip and can be connected to the ground terminal.

[0089] The eighth pin 8 is the collector terminal of the first internal bipolar junction transistor of the switching power supply pulse width modulation control chip, and the eighth capacitor C8 is the power supply voltage filter capacitor of the collector of the first internal bipolar junction transistor.

[0090] The ninth pin 9 is the emitter terminal of the first internal bipolar junction transistor of the switching power supply pulse width modulation control chip.

[0091] The tenth pin 10 is the emitter terminal of the second internal bipolar junction transistor of the switching power supply pulse width modulation control chip.

[0092] The eleventh pin 11 is the collector terminal of the second internal bipolar junction transistor of the switching power supply pulse width modulation control chip.

[0093] The twelfth pin 12 is a power input pin of the switching power supply pulse width modulation control chip. The ninth capacitor C9 can filter out high-frequency noise on the power supply line to prevent such noise from interfering with the internal circuit of the switching power supply pulse width modulation control chip.

[0094] The thirteenth pin 13 is the working mode control terminal of the switching power supply pulse width modulation control chip. The tenth capacitor C10 can stabilize the voltage of the thirteenth pin 13 and reduce noise. Among them, the working mode includes selecting a single-ended output mode, a parallel output mode and a push-pull output mode.

[0095] The fourteenth pin 14 is the output pin of the switching power supply pulse width modulation control chip, which can provide a constant 5V output and a fixed reference voltage for the error operational amplifier. The twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 form a voltage divider network, which can adjust the first error amplifier and the input end of the first error amplifier. This voltage divider network can determine the operating point of the operational amplifier.

[0096] The fifteenth pin 15 is the inverting input terminal of the second error amplifier of the switching power supply pulse width modulation control chip. The fifteenth pin 15 can receive an external signal or user input through the eleventh capacitor C11, and can be decoupled and filtered through the eleventh capacitor C11 to avoid introducing high-frequency noise.

[0097] The sixteenth pin 16 is the non-inverting input terminal of the second error amplifier of the switching power supply pulse width modulation control chip.

[0098] The fifteenth resistor R15 acts as a current limiting resistor, which can limit the current flowing into the internal error amplifier of the switching power supply pulse width modulation control chip to prevent the switching power supply pulse width modulation control chip from being damaged by overcurrent. The twelfth capacitor C12 acts as a decoupling capacitor, which can provide a short-circuit path for high-frequency noise to ground, thereby reducing the influence of noise generated by the power supply line or other circuits on the internal error amplifier of the switching power supply pulse width modulation control chip.

[0099] The switching power supply pulse width modulation control chip can adjust the duty cycle of the internal pulse width modulation comparator output signal through the feedback signal received by the third pin 3, and the modulated pulse width modulation signal is then output to the internal pulse control trigger. The pulse control trigger outputs a pulse signal with a certain frequency and duty cycle, which is amplified by the first internal bipolar junction transistor and the second internal bipolar junction transistor and output from the emitter end (ninth pin 9) of the first internal bipolar junction transistor and the emitter end (tenth pin 10) of the second internal bipolar junction transistor. The pulse width modulation signal output by the switching power supply pulse width modulation control chip is further amplified by the amplifier module and provided to the voltage conversion circuit.

[0100] like Fig.10 As shown, the amplifying module may include a fourth switching device Q4, a fifth switching device Q5, a sixteenth resistor R16 and a seventeenth resistor R17.

[0101] One end of the sixteenth resistor R16 is respectively connected to the ninth pin 9 and the tenth pin 10 of the switching power supply pulse width modulation control chip, the other end of the sixteenth resistor R16 is respectively connected to one end of the seventeenth resistor R17, the first end of the fourth switch device Q4 and the first end of the fifth switch device Q5, the other end of the seventeenth resistor R17 is connected to the ground, the second end of the fourth switch device Q4 is connected to the second end of the power supply circuit, the third end of the fourth switch device Q4 is respectively connected to the third end of the fifth switch device Q5 and the third end of the voltage conversion circuit, and the second end of the fifth switch device Q5 is connected to the ground.

[0102] The fourth switch device Q4 may be a triode, or other devices for controlling circuit switching. The fifth switch device Q5 may be a triode, or other devices for controlling circuit switching. Fig.10 The description is made by taking the fourth switch device Q4 and the fifth switch device Q5 as triodes as an example.

[0103] When the fourth switch device Q4 is a transistor, the base of the transistor is the first end of the fourth switch device Q4, the collector of the transistor is the second end of the fourth switch device Q4, and the emitter of the transistor is the third end of the fourth switch device Q4.

[0104] When the fifth switch device Q5 is a transistor, the base of the transistor is the first end of the fifth switch device Q5, the collector of the transistor is the second end of the fifth switch device Q5, and the emitter of the transistor is the third end of the fifth switch device Q5.

[0105] The sixteenth resistor R16 can limit the current flowing from the ninth pin and the tenth pin of the switching power supply pulse width modulation control chip to the fourth switching device Q4 and the fifth switching device Q5, thereby preventing the switching devices from being damaged by overcurrent and ensuring that the switching devices can switch stably.

[0106] The seventeenth resistor R17 is used as a pull-down resistor to ensure that the fourth switch device Q4 and the fifth switch device Q5 are in a closed state when there is no input signal, and to ensure that the switch devices will not be mis-turned on due to floating voltage when the control signal is missing.

[0107] In addition, the seventeenth resistor R17 eliminates static electricity or noise that may exist at the input terminal by providing a clear low potential path for the base of the fourth switching device Q4 and the base of the fifth switching device Q5.

[0108] See also Fig.11 , Fig.11 Schematic diagram of a slow start circuit disclosed in the embodiment of the present application. Fig.11 As shown, the slow start circuit may include a third resistor R3, a fourth resistor R4, a first capacitor C1 and a second switch device Q2.

[0109] The first end of the second switch device Q2 is respectively connected to one end of the third resistor R3, one end of the first capacitor C1 and one end of the fourth resistor R4, the second end of the second switch device Q2 is respectively connected to the first end of the voltage conversion circuit and the first end of the pulse width modulation circuit, the third end of the second switch device Q2 is respectively connected to the other end of the third resistor R3 and the other end of the first capacitor C1, the third end of the second switch device Q2 is the input end of the boost circuit, and the other end of the fourth resistor R4 is connected to the ground.

[0110] The second switch device Q2 may be a MOS tube, or other devices with equivalent functions.

[0111] When the second switch device Q2 is a MOS tube, the gate of the MOS tube is the first end of the second switch device Q2, the drain of the MOS tube is the second end of the second switch device Q2, and the source of the MOS tube is the third end of the second switch device Q2.

[0112] When the slow start circuit is powered on, the third resistor R3 and the fourth resistor R4 provide a charging path for the first capacitor C1, and the charging time determines the turn-on time of the second switch device Q2, thereby achieving the purpose of delaying the turn-on of the second switch device Q2.

[0113] See also Fig.12 , Fig.12 Schematic diagram of a power supply circuit disclosed in an embodiment of the present application. Fig.12 As shown, the power supply circuit may include a fifth resistor R5, a second diode D2 and a third switch device Q3.

[0114] The first end of the third switching device Q3 is respectively connected to one end of the fifth resistor R5 and the cathode of the second diode D2, the second end of the third switching device Q3 and the other end of the fifth resistor R5 are respectively connected to the first end of the voltage conversion circuit, the third end of the third switching device Q3 is connected to the first end of the pulse width modulation circuit, and the anode of the second diode D2 is connected to the ground.

[0115] The third switch device Q3 may be a triode or other device for controlling a circuit switch. When the third switch device Q3 is a triode, the base of the triode is the first end of the third switch device Q3, the collector of the triode is the second end of the third switch device Q3, and the emitter of the triode is the third end of the third switch device Q3.

[0116] For example, the third switching device Q3 is an NPN transistor, the fifth resistor R5 is a base power supply current limiting resistor, the second diode D2 is an 8V voltage regulator, the second diode D2 converts the first DC signal into a voltage of 8V, and then converts the voltage into a fourth DC signal with a voltage of 9V through the third switching device Q3, providing a stable power supply for the pulse width modulation circuit.

[0117] The embodiment of the present application discloses a power supply device, including a first transmission line device, a second transmission line device and a boost circuit. One end of the first transmission line device is the input end of the power supply device, the other end of the first transmission line device is connected to the input end of the boost circuit, the output end of the boost circuit is connected to one end of the second transmission line device, and the other end of the second transmission line device is the output end of the power supply device.

[0118] See also Fig.13 , Fig.13 Schematic diagram of a power supply device disclosed in an embodiment of the present application. Fig.13 As shown, the power supply device may include a first transmission line device 101 , a boost circuit 102 , and a second transmission line device 103 .

[0119] It should be understood that the first transmission line device and the second transmission line device may be various types of media for transmitting signals, such as metal core wires, printed circuit boards (PCBs), and the like.

[0120] It should be understood that when voltage transmission is required between two devices, there may be one power supply device or multiple power supply devices between them.

[0121] See also Fig.14 , Fig.14 Schematic diagram of the structure of a transmission line device disclosed in the embodiment of the present application. Fig.14As shown, the transmission line device may include a power input terminal, a signal input terminal, a power input ground terminal, a power output terminal, a signal output terminal, and a power output ground terminal.

[0122] The transmission line device may include a power transmission device and a signal transmission device, and the signal transmission device may include a signal input terminal and a signal output terminal.

[0123] It should be understood that the signal transmission device performs signal transmission through the branch of the boost circuit.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A boost circuit, characterized in that: It includes a voltage conversion circuit and a pulse width modulation circuit, wherein: The first end of the voltage conversion circuit is the input end of the boost circuit, the second end of the voltage conversion circuit is the output end of the boost circuit, the first end of the pulse width modulation circuit is connected to the first end of the voltage conversion circuit, and the second end of the pulse width modulation circuit is connected to the third end of the voltage conversion circuit; The pulse width modulation circuit is used to provide a first control signal for the voltage conversion circuit; The voltage conversion circuit is used to convert the first DC signal into a second DC signal according to the first control signal, and the voltage of the first DC signal is smaller than the voltage of the second DC signal.

2. The boost circuit according to claim 1, characterized in that: The voltage conversion circuit is also used to provide a feedback signal for the pulse width modulation circuit; The pulse width modulation circuit is specifically used to provide the first control signal to the voltage conversion circuit according to the feedback signal.

3. The boost circuit according to claim 1, characterized in that: The boost circuit also includes a slow start circuit, wherein: The input end of the slow start circuit is the input end of the boost circuit, and the output end of the slow start circuit is connected to the first end of the voltage conversion circuit and the first end of the pulse width modulation circuit respectively; The slow start circuit is used to filter the overshoot voltage in the first DC signal to obtain a third DC signal; The voltage conversion circuit is specifically used to convert the third DC signal into a second DC signal according to the first control signal, and the voltage of the third DC signal is smaller than the voltage of the second DC signal.

4. The boost circuit according to claim 1, characterized in that: The boost circuit also includes a power supply circuit, wherein: The input end of the power supply circuit is connected to the first end of the voltage conversion circuit, and the output end of the power supply circuit is connected to the first end of the pulse width modulation circuit; The power supply circuit is used to convert the first direct current signal into a fourth direct current signal, wherein the voltage of the fourth direct current signal is a preset voltage; The pulse width modulation circuit is specifically configured to provide the first control signal to the voltage conversion circuit according to the fourth direct current signal.

5. The boost circuit according to claim 2, characterized in that: The voltage conversion circuit includes a first switch device, a first inductor, a first diode and a voltage dividing module, wherein: The first end of the first switch device is connected to the second end of the pulse width modulation circuit, the second end of the first switch device is respectively connected to one end of the first inductor and the positive electrode of the first diode, the other end of the first inductor is the input end of the boost circuit, the negative electrode of the first diode is connected to one end of the voltage divider module, the other end of the voltage divider module and the third end of the first switch device are respectively connected to the ground, and the two ends of the voltage divider module are the output ends of the boost circuit; The voltage divider module is used to provide the feedback signal to the pulse width modulation circuit.

6. The boost circuit according to claim 5, characterized in that: The voltage conversion circuit further includes a first resistor, wherein: The first terminal of the first switching device is connected to the second terminal of the pulse width modulation circuit through the first resistor.

7. The boost circuit according to claim 6, characterized in that: The voltage conversion circuit further includes a second resistor, wherein: The first terminal of the first switch device is connected to the ground terminal through the second resistor.

8. The voltage boost circuit according to claim 5, characterized in that: The voltage conversion circuit further includes a first filtering module, wherein: One end of the first filter module is connected to the other end of the first inductor, and the other end of the first filter module is connected to the ground; The first filtering module is used to filter high-frequency noise.

9. The boost circuit according to claim 5, characterized in that: The voltage conversion circuit further includes a second filtering module, wherein: The second filtering module is connected in parallel with the voltage dividing module; The second filtering module is used to filter high-frequency noise.

10. The boost circuit according to claim 2, characterized in that: The pulse width modulation circuit includes a modulation module and an amplification module, wherein: The first end of the modulation module is connected to the first end of the voltage conversion circuit, the second end of the modulation module is connected to the first end of the amplification module, the second end of the amplification module is connected to the third end of the voltage conversion circuit, and the third end of the modulation module is connected to the fourth end of the voltage conversion module; The modulation module is used to generate a second control signal according to the feedback signal; The amplification module is used to amplify the second control signal to obtain the first control signal.

11. The voltage boost circuit according to claim 3, characterized in that: The slow start circuit comprises a third resistor, a fourth resistor, a first capacitor and a second switch device, wherein: The first end of the second switching device is respectively connected to one end of the third resistor, one end of the first capacitor and one end of the fourth resistor, the second end of the second switching device is respectively connected to the first end of the voltage conversion circuit and the first end of the pulse width modulation circuit, the third end of the second switching device is respectively connected to the other end of the third resistor and the other end of the first capacitor, the third end of the second switching device is the input end of the boost circuit, and the other end of the fourth resistor is connected to the ground.

12. The boost circuit according to claim 4, characterized in that: The power supply circuit includes a fifth resistor, a second diode and a third switch device, wherein: The first end of the third switching device is respectively connected to one end of the fifth resistor and the cathode of the second diode, the second end of the third switching device and the other end of the fifth resistor are respectively connected to the first end of the voltage conversion circuit, the third end of the third switching device is connected to the first end of the pulse width modulation circuit, and the anode of the second diode is connected to the ground.

13. A power supply device, characterized in that: The invention comprises a first transmission line device, a second transmission line device and a boost circuit as claimed in any one of claims 1 to 12, wherein: One end of the first transmission line device is the input end of the power supply device, the other end of the first transmission line device is connected to the input end of the boost circuit, the output end of the boost circuit is connected to one end of the second transmission line device, and the other end of the second transmission line device is the output end of the power supply device.

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