Start-up circuit, auxiliary power supply circuit and electronic device

Abstract

The application relates to a starting circuit, an auxiliary power supply circuit and electronic equipment, the starting circuit comprising a starting module, a signal generator and an auxiliary control module; under normal operation of the starting module, the starting module is used for outputting a first voltage signal based on an input voltage and an enabling signal of the first level signal, and the starting module is also used for outputting a second voltage signal based on the input voltage and the enabling signal of the second level signal; the auxiliary control module is used for being turned off based on the enabling signal of the first level signal or the second voltage signal; when the auxiliary control module is turned off, the signal generator is used for being started based on the first voltage signal and is used for stopping working based on the second voltage signal; when the starting module is faulty and continuously outputs the first voltage signal, the auxiliary control module is also used for being turned on based on the first voltage signal and the enabling signal of the second level signal, so as to control the signal generator to stop working and avoid that the chip works in an uncontrollable range.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a startup circuit, an auxiliary power supply circuit, and an electronic device. Background Technology

[0002] Most power supply circuits include a startup circuit. Power supply products need to obtain power from the input terminal and provide a stable supply voltage to the subsequent control circuit, so that the control circuit can work to provide electrical energy.

[0003] When a component (such as a PMOS) in the startup module fails, the system cannot stop working. At this time, the system cannot be powered down. After a certain period of time, the charge on the input voltage VIN at the input terminal will be completely released. At this time, the signal generator operates in an uncontrollable range and is prone to various problems. Summary of the Invention

[0004] Therefore, it is necessary to provide a startup circuit, auxiliary power supply circuit, and electronic equipment that can control the signal generator to stop working through an enable signal when the startup module fails.

[0005] In a first aspect, this application provides a startup circuit, comprising:

[0006] The startup module 100 and the signal generator 300 are provided. The input terminal of the startup module 100 is connected to the input voltage VIN and the enable signal Subpower_EN. The power input port vin of the signal generator 300 is connected to the output terminal of the startup module 100. The enable signal Subpower_EN includes a first level signal for controlling the start of the signal generator 300 and a second level signal for controlling the stop of the signal generator 300.

[0007] An auxiliary control module 200 is provided, the input of which is connected to the enable signal Subpower_EN and the output of the start module 100 Subpower, and the output of the auxiliary control module 200 is connected to the compensation port of the signal generator 300.

[0008] When the startup module 100 is operating normally, it is configured to output a first voltage signal based on the input voltage VIN and the enable signal Subpower_EN of the first level signal, and also to output a second voltage signal based on the input voltage VIN and the enable signal Subpower_EN of the second level signal; the auxiliary control module 200 is configured to turn off based on the enable signal of the first level signal or the second voltage signal; when the auxiliary control module is turned off, the signal generator 300 is configured to start based on the first voltage signal and stop operating based on the second voltage signal;

[0009] When the startup module 100 malfunctions and continues to output the first voltage signal, the auxiliary control module 200 is also used to turn on the enable signal Subpower_EN based on the first voltage signal and the second level signal, so as to control the signal generator 300 to stop working.

[0010] In some optional embodiments, the auxiliary control module 200 includes:

[0011] The first switch submodule 210 has the enable signal Subpower_EN connected to its input terminal;

[0012] The second switch submodule 220 has its input terminal connected to the output terminal of the first switch submodule 210 and the output terminal of the start module 100, and its output terminal connected to the compensation port of the signal generator 300.

[0013] When the startup module 100 is operating normally, the first switch submodule 210 is used to turn on the enable signal Subpower_EN based on the first level signal, so as to control the second switch submodule 220 to turn off; the first switch submodule 210 is also used to turn off the enable signal Subpower_EN based on the second level signal, so that the second switch submodule 220 is turned off based on the second voltage signal.

[0014] When the startup module 100 malfunctions and continuously outputs the first voltage signal, the first switch submodule 210 is used to turn on the enable signal Subpower_EN based on the first level signal to control the second switch submodule 220 to turn off; the first switch submodule 210 is also used to turn off the enable signal Subpower_EN based on the second level signal, and the second switch submodule 220 is used to turn on based on the first voltage signal to pull down the voltage of the compensation port.

[0015] In some optional embodiments, the first switch submodule 210 includes a switch transistor Q6, the control terminal of the switch transistor Q6 is connected to the enable signal, and the output terminal of the switch transistor Q6 is connected to the control terminal of the second switch submodule 220.

[0016] The switching transistor Q6 is used to turn on based on the enable signal Subpower_EN based on the first level signal or to turn off based on the enable signal Subpower_EN based on the second level signal.

[0017] In some optional embodiments, the second switch submodule 220 includes a switch transistor Q5, the control terminal of which is connected to the output terminal of the first switch submodule 210 and the output terminal of the start module 100, the first terminal of which is connected to the compensation port of the signal generator 300, and the second terminal of which is grounded.

[0018] When the startup module 100 is working normally, the switching transistor Q5 is used to be cut off when the first switching submodule 210 is turned on, or to be cut off under the control of the second voltage signal output by the startup module 100 when the first switching submodule 210 is turned off.

[0019] When the startup module 100 malfunctions and continuously outputs the first voltage signal, the switching transistor Q5 is used to be turned off when the first switching submodule 210 is turned on, or turned on under the control of the first voltage signal output by the startup module 100 when the first switching submodule 210 is turned off.

[0020] In some optional embodiments, the startup module 100 includes:

[0021] Enable submodule 110, wherein the enable submodule 110 input terminal receives the enable signal Subpower_EN;

[0022] The input submodule 120 has an input terminal connected to the input voltage VIN and a control terminal connected to the output terminal of the enable submodule 110. The input submodule 120 is used to output the first voltage signal when the enable submodule 110 receives the first level signal; or to output the second voltage signal when the enable submodule 110 receives the second level signal.

[0023] A start submodule 130 is provided, wherein the input terminal of the start submodule 130 is connected to the output terminal of the input submodule 120, and the output terminal is connected to the input terminal of the signal generator 300. The start submodule 130 is used to output a start signal to the signal generator 300 based on the first voltage signal output by the input submodule 120; or to output a stop signal to the signal generator 300 based on the second voltage signal output by the input submodule 120.

[0024] In some optional embodiments, the enable submodule 110 includes a switch Q3, the control terminal of which is connected to the enable signal, and the output terminal of which is connected to the control terminal of the input submodule 120. The switch Q3 is used to turn on the enable signal Subpower_EN based on the first level signal or to turn off the enable signal Subpower_EN based on the second level signal.

[0025] In some optional embodiments, the input submodule 120 includes a switch Q1, the control terminal of which is connected to the output terminal of the enable submodule 110, the input terminal of which receives an input voltage VIN, and the output terminal of which is connected to the input terminal of the start-up submodule 130. The switch Q1 is used to output the first voltage signal when the enable submodule 110 receives the enable signal of the first level signal; or to output the second voltage signal when the enable submodule 110 receives the enable signal of the second level signal.

[0026] In some optional embodiments, the startup submodule 130 is further configured to adjust the magnitude of the startup voltage output to the signal generator 300 when the first voltage signal output by the input submodule 120 is greater than a voltage threshold.

[0027] The startup submodule 130 includes:

[0028] A switching transistor Q2 is connected to the first end of the input submodule 120 and the output end of the signal generator 300. A Zener diode DZ2 is connected to the control end of the switching transistor Q2.

[0029] When the first voltage signal output by the input submodule 120 is greater than the voltage threshold, the Zener diode DZ2 adjusts the magnitude of the start-up voltage output by the switching transistor Q2 to the signal generator 300.

[0030] Secondly, this application also provides an auxiliary power supply circuit, including the startup circuit according to any of the above embodiments.

[0031] Thirdly, this application also provides an electronic device including the auxiliary power supply circuit in any of the above embodiments.

[0032] In the above-mentioned starting circuit, auxiliary power supply circuit, and electronic equipment, under the normal operation of the starting module 100, the signal generator 300 is started based on the first voltage signal output by the starting module 100, or shut down based on the second voltage signal output by the starting module 100, and the auxiliary control module 200 does not affect the starting and shutting down of the signal generator 300; when the starting module 100 fails, the signal generator 300 is started based on the first voltage signal output by the starting module 100, or the auxiliary control module 200 is turned on based on the enable signal Subpower_EN of the second level signal, so as to control the signal generator 300 to stop working, so as to avoid the signal generator operating outside the uncontrollable range. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A block diagram of a startup circuit according to one embodiment;

[0035] Figure 2 This is a circuit diagram of an auxiliary power supply circuit in one embodiment. Detailed Implementation

[0036] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0038] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0039] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0040] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0041] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that terms such as “comprising / including” or “having” specify the presence of the stated features, integrals, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integrals, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0042] Please refer to Figure 1 and Figure 2 This application provides a startup circuit, which includes a startup module 100, an auxiliary control module 200, and a signal generator 300.

[0043] The input terminal of the start-up module 100 is connected to the input voltage VIN and the enable signal Subpower_EN. The power input port vin of the signal generator 300 is connected to the output terminal of the start-up module 100. The enable signal Subpower_EN includes a first-level signal for controlling the start of the signal generator 300 and a second-level signal for controlling the stop of the signal generator 300. The input terminal of the auxiliary control module 200 is connected to the enable signal Subpower_EN and the output terminal Subpower of the start-up module 100. The output terminal of the auxiliary control module 200 is connected to the compensation port of the signal generator 300.

[0044] When the startup module 100 is operating normally, the startup module 100 is used to output a first voltage signal based on the input voltage VIN and the enable signal Subpower_EN of the first level signal. The startup module 100 is also used to output a second voltage signal based on the input voltage VIN and the enable signal Subpower_EN of the second level signal. The auxiliary control module 200 is used to turn off based on the enable signal of the first level signal or the second voltage signal. When the auxiliary control module is turned off, the signal generator 300 is used to start based on the first voltage signal and to stop working based on the second voltage signal.

[0045] When the startup module 100 malfunctions and continuously outputs the first voltage signal, the auxiliary control module 200 is also used to turn on the enable signal Subpower_EN based on the first voltage signal and the second level signal, so as to control the signal generator 300 to stop working.

[0046] Specifically, in combination Figure 1 As shown, the output signal Subpower of the startup module 100 includes a non-zero first voltage signal and a zero second voltage signal. The enable signal Subpower_EN is a control signal used to control the switch of the signal generator 300. This enable signal Subpower_EN includes a first level signal and a second level signal. The first level signal is used to control the signal generator 300 to start, and the second level signal is used to control the signal generator to stop, wherein the first level signal and the second level signal are high and low level signals respectively.

[0047] When the startup module 100 is operating normally, the input enable signal Subpower_EN can control the startup module 100 to start or stop working. Specifically, when the enable signal Subpower_EN is at the first level, the startup module 100 starts working and outputs a first voltage signal based on the input voltage VIN. At this time, the auxiliary control module 200 is turned off based on the first level enable signal Subpower_EN, and the signal generator 300 starts working based on the first voltage signal. When the enable signal Subpower_EN is at the second level, the startup module 100 stops working and outputs a second voltage signal of zero. The auxiliary control module 200 is turned off based on the second voltage signal, and thus the signal generator 300 stops working based on the second voltage signal.

[0048] If the startup module 100 malfunctions and continuously outputs the first voltage signal, that is, if the enable signal Subpower_EN cannot control the operation of the startup module 100, the auxiliary control module 200 will be turned off when the startup module 100 outputs the first voltage signal, without affecting the operation of the signal generator 300; when the enable signal Subpower_EN is a second level signal, the auxiliary control module 200 will be turned on based on the second level signal to control the signal generator 300 to stop working.

[0049] In the aforementioned startup circuit, under normal operation of the startup module 100, the signal generator 300 starts based on the first voltage signal output by the startup module 100, or stops based on the second voltage signal output by the startup module 100, and the auxiliary control module 200 does not affect the startup and shutdown of the signal generator 300. When the startup module 100 malfunctions, the signal generator 300 starts based on the first voltage signal output by the startup module 100, or the auxiliary control module 200 turns on based on the enable signal Subpower_EN of the second level signal, to control the signal generator 300 to stop working, thereby preventing the signal generator from operating outside of an uncontrollable range. In some optional embodiments, refer to... Figure 1 The auxiliary control module 200 includes a first switch submodule 210 and a second switch submodule 220. The input terminal of the first switch submodule 210 is connected to the enable signal Subpower_EN; the input terminal of the second switch submodule 220 is connected to the output terminal of the first switch submodule 210 and the output terminal of the start module 100, and the output terminal of the second switch submodule 220 is connected to the compensation port of the signal generator 300.

[0050] When the startup module 100 is operating normally, the first switch submodule 210 is used to turn on the enable signal Subpower_EN based on the first level signal to control the second switch submodule 220 to turn off; the first switch submodule 210 is also used to turn off the enable signal Subpower_EN based on the second level signal so that the second switch submodule 220 is turned off based on the second voltage signal.

[0051] When the startup module 100 malfunctions and continuously outputs the first voltage signal, the first switch submodule 210 is turned on based on the enable signal Subpower_EN of the first level signal to control the second switch submodule 220 to be turned off; the first switch submodule 210 is also turned off based on the enable signal Subpower_EN of the second level signal, and the second switch submodule 220 is turned on based on the first voltage signal to pull down the voltage of the compensation port.

[0052] Specifically, in the first scenario, under normal operating conditions of the startup module 100: First, when the enable signal Subpower_EN is at a first-level signal, the first switch submodule 210 is turned on based on the first-level enable signal Subpower_EN, and since the startup module 100 outputs a first voltage signal at this time, the second switch submodule 220 is turned off; simultaneously, the startup module 100 is turned on based on the first-level enable signal Subpower_EN to output a non-zero first voltage signal, which provides the startup voltage for the signal generator 300; therefore, the signal generator 300 completes the startup operation based solely on the first voltage signal output by the startup module 100. Second, when the enable signal Subpower_EN is at a second-level signal, the first switch submodule 210 is turned off based on the second-level enable signal Subpower_EN; simultaneously, the startup module 100 outputs a zero second voltage signal, therefore the second switch submodule 220 is turned off; therefore, the signal generator 300 stops operating solely based on the second voltage signal output by the startup module 100.

[0053] Specifically, in the second scenario, when the startup module 100 malfunctions and continuously outputs the first voltage signal, regardless of whether the enable signal Subpower_EN is high or low, the startup module alone cannot properly control the start and stop of the signal generator 300. In this case, this application achieves startup and shutdown through the cooperation of the startup module 100 and the auxiliary control module 200. Specifically, firstly, when the enable signal Subpower_EN is at the first level, the first switch submodule 210 is turned on based on the first-level enable signal Subpower_EN. Since the startup module 100 outputs the first voltage signal at this time, the second switch submodule 220 is turned off. Simultaneously, the startup module 100 is turned on based on the first-level enable signal Subpower_EN to output a non-zero first voltage signal. This non-zero first voltage signal provides the startup voltage for the signal generator 300; therefore, the signal generator 300 completes the startup operation based on the first voltage signal output by the startup module 100. Secondly, when the enable signal Subpower_EN is a second-level signal, the first switch submodule 210 is turned off based on the second-level enable signal Subpower_EN. Since the start-up module 100 malfunctions and continuously outputs the first voltage signal at this time, the second switch submodule 220 is turned on based on the first voltage signal, which can pull down the voltage of the compensation port of the signal generator 300, thereby stopping the signal generator 300 from working.

[0054] Combined with reference Figure 1 and Figure 2The first switch submodule 210 includes a switch transistor Q6. The control terminal of the switch transistor Q6 is connected to an enable signal, and the output terminal of the switch transistor Q6 is connected to the control terminal of the second switch submodule 220. The switch transistor Q6 is used to turn on based on the enable signal Subpower_EN based on the first level signal or to turn off based on the enable signal Subpower_EN based on the second level signal.

[0055] In some optional embodiments, the second switch submodule 220 includes a switch transistor Q5. The control terminal of the switch transistor Q5 is connected to the output terminal of the first switch submodule 210 and the output terminal of the start-up module 100. The first terminal of the switch transistor Q5 is connected to the compensation port of the signal generator 300, and the second terminal of the switch transistor Q5 is grounded. Under normal operation of the start-up module 100, the switch transistor Q5 is used to cut off when the first switch submodule 210 is turned on, or to cut off when the first switch submodule 210 is turned off and under the control of the second voltage signal output by the start-up module 100. When the start-up module 100 malfunctions and continuously outputs the first voltage signal, the switch transistor Q5 is used to cut off when the first switch submodule 210 is turned on, or to turn on when the first switch submodule 210 is turned off and under the control of the first voltage signal output by the start-up module 100.

[0056] Further reference Figure 2 The peripheral circuit corresponding to the first switch submodule 210 includes resistor R18, and the peripheral circuit corresponding to the second switch submodule 220 includes resistors R13, R14 and R17.

[0057] In this configuration, the base of switch Q6 is connected to the first terminal of resistor R18, and the second terminal of resistor R18 receives the enable signal Subpower_EN. The collector of switch Q6 is connected to the second terminal of resistor R13, and the emitter of switch Q6 is grounded. The base of switch Q5 is connected to the second terminal of resistor R14. The first terminals of resistors R14 and R17 are connected to the collector of switch Q6, and the second terminal of resistor R17 is grounded. The emitter of switch Q5 is grounded, and the collector of switch Q5 is connected to the compensation port COMP of signal generator 300.

[0058] In addition, the peripheral circuit of the signal generator 300 includes a feedback circuit, which comprises a capacitor C3, a resistor R20, a resistor R21, and a resistor R22. The first terminal of capacitor C3 is connected to the compensation port COMP of the signal generator 300, and the second terminal of capacitor C3 is connected to the first terminal of resistor R20. The second terminals of resistors R20, R22, and R21 are connected to the feedback port FB of the signal generator 300. The first terminal of resistor R22 is connected to a +12V voltage, and the second terminal of resistor R21 is grounded.

[0059] When the startup module 100 is working normally, the startup module 100 and the auxiliary control module 200 exhibit the following two operating states:

[0060] Firstly, under the control of a high-level first-level signal, the startup module converts the input voltage VIN into a non-zero first voltage signal. The startup module 100 outputs a non-zero first voltage signal and simultaneously inputs it to the base of the switching transistor Q5. However, at the same time, the enable signal Subpower_EN is a high-level first-level signal input to the base of the switching transistor Q6, causing the switching transistor Q6 to conduct, thereby pulling down the base of the switching transistor Q5. Therefore, although the switching transistor Q5 obtains a non-zero first voltage signal, the conducting switching transistor Q6 also pulls down the voltage of the base of the switching transistor Q5, ultimately causing the switching transistor Q5 to turn off. As a result, the switching transistor Q5 fails to output a signal that affects the compensation port COMP of the signal generator 300. Consequently, the signal generator 300 only starts working based on the non-zero first voltage signal output by the startup module 100. Specifically, the power input port vin of the signal generator 300 obtains the first voltage signal to start.

[0061] Secondly, when the enable signal Subpower_EN is a low-level second-level signal, the startup module, under the control of the low-level second-level signal, converts the input voltage VIN into a zero second-level voltage signal. The startup module 100 outputs a zero second-level voltage signal, which is simultaneously input to the base of the switching transistor Q5. The switching transistor Q6 is turned off based on the zero-level second-level signal Subpower_EN. Therefore, the base of the switching transistor Q5 receives a zero second-level voltage signal, which ultimately causes the switching transistor Q5 to be turned off. As a result, the switching transistor Q5 fails to output a signal that affects the compensation port COMP of the signal generator 300. Consequently, the signal generator 300 stops working based solely on the zero second-level voltage signal output by the startup module 100. Specifically, the power input port vin of the signal generator 300 receives the second-level voltage signal to stop working.

[0062] When the startup module 100 malfunctions and continuously outputs a non-zero first voltage signal, the startup module 100 and the auxiliary control module 200 exhibit the following two operating states:

[0063] Firstly, when the enable signal Subpower_EN is a high-level first-level signal, the startup module 100, under the control of the first-level signal, converts the input voltage VIN into a non-zero first voltage signal. The startup module 100 outputs a non-zero first voltage signal and simultaneously inputs it to the base of the switching transistor Q5. However, at the same time, the enable signal Subpower_EN is also a high-level first-level signal input to the base of the switching transistor Q6, causing the switching transistor Q6 to conduct, thereby pulling down the base of the switching transistor Q5. Therefore, although the switching transistor Q5 obtains a non-zero first voltage signal, the conducting switching transistor Q6 also pulls down the voltage of the base of the switching transistor Q5, ultimately causing the switching transistor Q5 to be turned off. As a result, the switching transistor Q5 fails to output a signal that affects the compensation port COMP of the signal generator 300. Consequently, the signal generator 300 only starts working based on the non-zero first voltage signal output by the startup module 100. Specifically, the power input port vin of the signal generator 300 obtains the first voltage signal to start.

[0064] Secondly, when the enable signal Subpower_EN is a low-level second-level signal, the low-level second-level enable signal is intended to control the signal generator 300 to stop working. However, due to a malfunction in the startup module 100, the startup module 100 continuously outputs a non-zero first voltage signal to the signal generator 300 under the control of the low-level second-level signal, preventing the signal generator 300 from shutting down normally. In this situation, the switch Q6 is cut off under the control of the low-level second-level signal. At the same time, the base of the switch Q5 conducts when receiving the first voltage signal output by the startup module 100. The conducting switch Q5 pulls down the compensation port COMP of the signal generator 300, causing the signal generator 300 to stop working, thus preventing the signal generator from failing to shut down normally and causing it to operate outside the uncontrollable range.

[0065] Combined with reference Figure 1 and Figure 2 The startup module 100 includes an enable submodule 110, an input submodule 120, and a startup submodule 130. The enable submodule 110 receives the enable signal Subpower_EN at its input terminal; the input submodule 120 is connected to the input voltage VIN at its input terminal, and its control terminal is connected to the output terminal of the enable submodule 110; the startup submodule 130 has its input terminal connected to the output terminal of the input submodule 120, and its output terminal connected to the input terminal of the signal generator 300.

[0066] The input submodule 120 is configured to output a first voltage signal when an enable signal of a first level signal is input to the enable submodule 110; or to output a second voltage signal when an enable signal of a second level signal is input to the enable submodule 110. The start submodule 130 is configured to output a start signal to the signal generator 300 based on the first voltage signal output by the input submodule 120; or to output a stop signal to the signal generator 300 based on the second voltage signal output by the input submodule 120.

[0067] In the case of normal operation of the startup module 100, the enable submodule 110 receives an enable signal Subpower_EN at a first-level signal, enabling the enable submodule 110 to control the input submodule to output a first voltage signal based on the input voltage VIN. The startup submodule 130 then outputs a startup signal to the signal generator 300 based on the first voltage signal output by the input submodule 120, causing the signal generator 300 to start working. When the enable submodule 110 receives an enable signal Subpower_EN at a second-level signal, the enable submodule 110 controls the input submodule 120 to output a second voltage signal of zero based on the input voltage VIN. The startup submodule 130 then outputs a startup signal of zero based on the second voltage signal output by the input submodule to the signal generator 300, causing the signal generator 300 to stop working.

[0068] In the event of a failure in the startup module 100, i.e., a failure in the input submodule 120, regardless of whether the input of the enable submodule 110 is a first-level enable signal Subpower_EN or a second-level enable signal Subpower_EN, the input submodule 120 outputs a first voltage signal based on the input voltage VIN. The startup submodule 130 outputs a startup signal to the signal generator 300 based on the first voltage signal output by the input submodule 120, so that the signal generator 300 continues to work. At this time, the auxiliary control module 200 is introduced. When the enable signal Subpower_EN is a second-level signal, the auxiliary control module 200 is turned on based on the second-level signal to control the signal generator 300 to stop working.

[0069] In some optional embodiments, the enable submodule 110 includes a switch Q3. An enable signal is input to the control terminal of the switch Q3, and the output terminal of the switch Q3 is connected to the control terminal of the input submodule 120. The switch Q3 is used to turn on based on the enable signal Subpower_EN based on a first level signal or to turn off based on the enable signal Subpower_EN based on a second level signal.

[0070] The enable submodule 110 also includes resistors R9, R8, and R10. The first terminal of resistor R9 receives the enable signal Subpower_EN, the second terminal of resistor R9 is connected to the base of switch Q3, the first terminal of resistor R10 is connected to the base of switch Q3, the second terminal of resistor R10 and the emitter of switch Q3 are grounded, the collector of switch Q3 is connected to the second terminal of resistor R8, and the first terminal of resistor R8 is connected to the enable terminal of input submodule 120.

[0071] In some optional embodiments, the input submodule 120 includes a switch Q1, the control terminal of which is connected to the output terminal of the enable submodule 110, the input terminal of which receives an input voltage VIN, and the output terminal of which is connected to the input terminal of the start-up submodule 130. The switch Q1 is used to output a first voltage signal when the enable submodule 110 receives an enable signal of a first level signal; or to output a second voltage signal when the enable submodule 110 receives an enable signal of a second level signal.

[0072] The input submodule 120 includes a diode D1, a Zener diode DZ1, a resistor R1, and a switching transistor Q1. The first terminal of the diode D1 receives the input voltage VIN. The second terminal of the diode D1, the first terminal of the resistor R1, and the second terminal of the Zener diode DZ1 are connected to the drain of the switching transistor Q1. The first terminal of the Zener diode DZ1, the second terminal of the resistor R1, and the gate of the switching transistor Q1 are connected to the output terminal of the enable submodule 110. The source of the switching transistor Q1 and the first terminal of the capacitor CE1 are connected to the input terminal of the start-up submodule 130. The second terminal of the capacitor CE1 is grounded.

[0073] In the input submodule 120, diode D1 is unidirectionally conductive. If the input voltage VIN is reversed, diode D1 will be cut off, cutting off the power supply to the subsequent circuit and preventing device damage. Zener diode DZ1 and resistor R1 clamp the gate voltage of switching transistor Q1 within a safe value to prevent high-voltage breakdown. This switching transistor Q1 acts as an input switch, providing an output signal to the subsequent module when it is turned on.

[0074] When the enable signal Subpower_EN is at the first level, switch Q3 is turned on, which pulls the gate of switch Q1 low. Therefore, switch Q1 is turned on, and the input voltage VIN passes through switch Q1 to obtain a non-zero first voltage signal.

[0075] When the enable signal Subpower_EN is at the second level, the switch Q3 is turned off, and the gate of the switch Q1 is clamped to a high potential. Therefore, the switch Q1 is turned off, the input voltage VIN cannot pass through the switch Q1, and the output signal is the second voltage signal with zero.

[0076] In the event of a fault in switch Q1, such as a short circuit, switch Q1 is not controlled by switch Q3, and thus switch Q1 remains on. The input voltage VIN passes through switch Q1 to obtain a non-zero first voltage signal.

[0077] In some optional embodiments, the startup submodule 130 is also configured to adjust the magnitude of the startup voltage output to the signal generator 300 when the first voltage signal output by the input submodule 120 is greater than a voltage threshold.

[0078] During normal operation, when the input voltage VIN is less than the voltage threshold, the enable signal Subpower_EN is at a high level. At this time, the enable submodule 110 outputs a high-level enable signal to the input submodule 120, so that the input submodule 120 can output a first voltage signal to the start submodule 130 based on the input voltage VIN. When the input voltage VIN is less than the voltage threshold, the start submodule 130 outputs a normal start voltage.

[0079] When the input voltage VIN is greater than or equal to the voltage threshold, the enable signal Subpower_EN is at a high level. At this time, the enable submodule 110 outputs a high-level enable signal to the input submodule 120, so that the input submodule 120 can output a first voltage signal to the start-up submodule 130 based on the input voltage VIN. When the input voltage VIN is greater than or equal to the voltage threshold, the start-up submodule 130 adjusts the magnitude of the start-up voltage output to the signal generator 300.

[0080] The startup submodule 130 includes a switching transistor Q2. The first terminal of the switching transistor Q2 is connected to the output terminal of the input submodule 120, and the output terminal of the switching transistor Q2 is connected to the input terminal of the signal generator 300. The control terminal of the switching transistor Q2 is connected to a Zener diode DZ2. When the first voltage signal output by the input submodule 120 is greater than the voltage threshold, the Zener diode DZ2 adjusts the magnitude of the startup voltage output by the switching transistor Q2 to the signal generator 300.

[0081] The startup submodule 130 also includes resistors R3, R6, and R7. Specifically, the first end of resistor R3 is connected to the output terminal of input submodule 120; the collector of switching transistor Q2 is connected to the second end of resistor R3, and the emitter of switching transistor Q2 is connected to the input terminal of signal generator 300; the first end of resistor R6 is connected to the output terminal of input submodule 120, and the second end of resistor R6 is connected to the base of switching transistor Q2; the first end of resistor R7 is connected to the second end of resistor R6, and the second end of resistor R7 is grounded; the two ends of Zener diode DZ2 are respectively connected to the two ends of resistor R7.

[0082] Zener diode DZ2 is used to limit the voltage of switching transistor Q2 to the regulated value of Zener diode DZ2 when the input voltage VIN is greater than the voltage threshold, thereby adjusting the magnitude of the start-up voltage output to signal generator 300. The start-up voltage is then output to the input terminal of signal generator 300 via diode D4.

[0083] Specifically, during normal operation, when the input voltage VIN is less than the voltage threshold, the enable signal Subpower_EN is at the first level, the switch Q3 is turned on, pulling the gate of the switch Q1 low, and the switch Q1 is turned on. The input voltage VIN passes through diode D1, switch Q1, resistor R3, switch Q2, and resistor R4 to reach the input terminal of the signal generator 300 to achieve soft start. After soft start, +12V rises and supplies power to the signal generator 300.

[0084] When the input voltage VIN is greater than the voltage threshold, the input voltage VIN passes through diode D1, switch Q1, resistor R6, and resistor R7. The voltage across resistor R7 is then limited by Zener diode DZ2 to within its regulated value. The input voltage VIN then passes through diode D1, switch Q1, resistor R3, and switch Q2. The voltage across switch Q2 is close to the regulated value of Zener diode DZ2. Finally, it passes through diode D4 to reach the input terminal of signal generator 300, achieving soft start and ensuring the normal startup of signal generator 300.

[0085] In the above embodiment, when the input voltage VIN is greater than the voltage threshold, the Zener diode DZ2 provides a normal start-up voltage to the signal generator 300 to achieve soft start.

[0086] In some alternative embodiments, combined with Figure 2 As shown, this application also provides an auxiliary power supply circuit, including the startup circuit in any of the above embodiments.

[0087] The auxiliary power supply circuit also includes a transformer module, which includes a transformer, a primary submodule and a secondary submodule. The primary submodule includes a primary coil, a capacitor C1, a resistor R2, a diode D3, a capacitor C4, a switching transistor Q4, resistors R11, R12, R15, R16, R19 and a capacitor C7. The first terminal of capacitor C1, the first terminal of resistor R2, and the first terminal of the primary coil are input to the first voltage signal or the second voltage signal output by the start-up module 100. The second terminal of capacitor C1 and the second terminal of resistor R2 are connected to the first terminal of switch Q3. The second terminal of switch Q3, the drain of switch Q4, and the first terminal of capacitor C4 are connected to the second terminal of the primary coil. The second terminal of capacitor C4 is connected to the first terminal of resistor R11. The second terminal of resistor R11, the first terminal of resistor R19, the source of switch Q4, and the second terminal of resistor R15 are connected to the second terminal of resistor R16. The second terminal of resistor R19 and the second terminal of capacitor C7 are grounded. The first terminal of capacitor C7 and the first terminal of resistor R16 are connected to the CS terminal of signal generator 300. The first terminal of resistor R15 and the second terminal of resistor R12 are connected to the gate of switch Q4. The first terminal of resistor R12 is connected to the GATE terminal of signal generator 300. The secondary submodule includes a secondary coil, capacitor C2, switch Q2, resistor R4, resistor R5, and capacitor EC1. The first end of the secondary coil and the first end of capacitor C2 are connected to the first end of switch Q2. The second end of capacitor C2 is connected to the first end of resistor R4. The second end of switch Q2, the second end of resistor R4, and the first end of resistor R5 are connected to the first end of capacitor EC1. The second end of capacitor EC1 and the second end of resistor R5 are connected to the second end of the secondary coil and grounded.

[0088] When the signal generator 300 is started, it drives the switching transistor Q4 to switch. The primary coil of the transformer induces an alternating voltage, which is rectified by diode D3 and filtered by capacitor C1 to obtain +12V DC. The switching transistor Q2 is maintained by feedback through resistor R2, and at the same time, it is sent to the input terminal of the signal generator 300 through diode D5, replacing the start-up circuit to continuously power the signal generator 300 and reduce the power consumption of the start-up circuit.

[0089] In addition, the GATE terminal of the signal generator 300 outputs a high-frequency PWM signal, which drives the switching transistor Q4 after passing through resistor R12. Thus, the output voltage can be applied to both ends of the primary coil of the transformer. The transformer stores magnetic energy. When the switching transistor Q4 is turned off, the magnetic energy of the primary winding is coupled through the transformer to induce a voltage in the secondary / auxiliary winding, thus completing the conversion from DC to high-frequency AC.

[0090] In the secondary submodule, diode D2 rectifies the alternating voltage into unidirectional DC, and capacitors C2 and EC1 filter out ripple, outputting a smooth +12V voltage.

[0091] Resistors R5 and R4 divide the +12V voltage to generate a sampling signal proportional to the output voltage, which is sent to the feedback port FB of the signal generator 300 to provide a basis for the voltage regulation closed loop. The signal generator 300 compares the sampled voltage at the feedback port FB with the internal reference voltage and dynamically adjusts the PWM output at the GATE terminal to keep the +12V output stable. Resistor R19 samples the drain current of the switching transistor Q4. When the current exceeds the internal threshold of the signal generator 300, the CS terminal potential triggers the protection logic, and the signal generator 300 immediately shuts off the PWM output at the GATE terminal to prevent the switching transistor Q4 and the transformer from burning out due to overcurrent. Diode D5 isolates the startup module 100 and the self-powered module of the signal generator 300 to prevent the internal voltage of the signal generator 300 from flowing back into the primary coil and damaging diode D3.

[0092] The auxiliary power supply circuit described above can prevent the signal generator 300 from operating when the startup module 100 fails by introducing the startup circuit described above, and provide the signal generator 300 with a normal operating voltage when the input voltage VIN is too high, so as to achieve soft start.

[0093] In some alternative embodiments, this application also provides an electronic device including the auxiliary power supply circuit of any of the above embodiments.

[0094] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A startup circuit, characterized in that, include: A startup module (100) and a signal generator (300) are provided. The input terminal of the startup module (100) is connected to the input voltage VIN and the enable signal Subpower_EN. The power input port vin of the signal generator (300) is connected to the output terminal of the startup module (100). The enable signal Subpower_EN includes a first level signal for controlling the startup of the signal generator (300) and a second level signal for controlling the shutdown of the signal generator (300). An auxiliary control module (200) is provided, the input of which is connected to the enable signal Subpower_EN and the output of the start module (100) Subpower, and the output of which is connected to the compensation port of the signal generator (300). Under normal operating conditions, the startup module (100) is configured to output a first voltage signal based on the input voltage VIN and the enable signal Subpower_EN of the first level signal, and the startup module (100) is also configured to output a second voltage signal based on the input voltage VIN and the enable signal Subpower_EN of the second level signal; the auxiliary control module (200) is configured to turn off based on the enable signal Subpower_EN of the first level signal or the second voltage signal; when the auxiliary control module is turned off, the signal generator (300) is configured to start based on the first voltage signal and to stop working based on the second voltage signal; When the startup module (100) malfunctions and continues to output the first voltage signal, the auxiliary control module (200) is also used to turn on the enable signal Subpower_EN based on the first voltage signal and the second level signal to control the signal generator (300) to stop working.

2. The circuit according to claim 1, characterized in that, The auxiliary control module (200) includes: The first switch submodule (210) has the enable signal Subpower_EN connected to its input terminal; The second switch submodule (220) has its input terminal connected to the output terminal of the first switch submodule (210) and the output terminal of the start module (100), and its output terminal connected to the compensation port of the signal generator (300). When the startup module (100) is operating normally, the first switch submodule (210) is used to turn on the enable signal Subpower_EN based on the first level signal to control the second switch submodule (220) to turn off; the first switch submodule (210) is also used to turn off the enable signal Subpower_EN based on the second level signal so that the second switch submodule (220) is turned off based on the second voltage signal. When the startup module (100) malfunctions and continuously outputs the first voltage signal, the first switch submodule (210) is used to turn on the enable signal Subpower_EN based on the first level signal to control the second switch submodule (220) to turn off; the first switch submodule (210) is also used to turn off the enable signal Subpower_EN based on the second level signal, and the second switch submodule (220) is used to turn on based on the first voltage signal to pull down the voltage of the compensation port.

3. The circuit according to claim 2, characterized in that, The first switch submodule (210) includes a switch transistor Q6, the control terminal of the switch transistor Q6 is connected to the enable signal Subpower_EN, and the output terminal of the switch transistor Q6 is connected to the control terminal of the second switch submodule (220). The switching transistor Q6 is used to turn on based on the enable signal Subpower_EN based on the first level signal or to turn off based on the enable signal Subpower_EN based on the second level signal.

4. The circuit according to claim 2, characterized in that, The second switch submodule (220) includes a switch transistor Q5. The control terminal of the switch transistor Q5 is connected to the output terminal of the first switch submodule (210) and the output terminal of the start-up module (100). The first terminal of the switch transistor Q5 is connected to the compensation port of the signal generator (300), and the second terminal of the switch transistor Q5 is grounded. When the startup module (100) is working normally, the switch Q5 is used to be turned off when the first switch submodule (210) is turned on, or turned off when the first switch submodule (210) is turned off and under the control of the second voltage signal output by the startup module (100); When the startup module (100) malfunctions and continuously outputs the first voltage signal, the switch Q5 is used to be turned off when the first switch submodule (210) is turned on, or turned on under the control of the first voltage signal output by the startup module (100) when the first switch submodule (210) is turned off.

5. The circuit according to claim 1, characterized in that, The startup module (100) includes: Enable submodule (110), wherein the enable submodule (110) inputs an enable signal Subpower_EN; An input submodule (120) is provided, wherein the input terminal of the input submodule (120) is connected to the input voltage VIN, and the control terminal is connected to the output terminal of the enable submodule (110). The input submodule (120) is used to output the first voltage signal when the enable signal Subpower_EN of the enable submodule (110) inputs the first level signal; or to output the second voltage signal when the enable signal Subpower_EN of the enable submodule (110) inputs the second level signal. A start submodule (130) is provided, wherein the input terminal of the start submodule (130) is connected to the output terminal of the input submodule (120), and the output terminal is connected to the input terminal of the signal generator (300). The start submodule (130) is used to output a start signal to the signal generator (300) based on the first voltage signal output by the input submodule (120); or to output a stop signal to the signal generator (300) based on the second voltage signal output by the input submodule (120).

6. The circuit according to claim 5, characterized in that, The enabling submodule (110) includes a switch Q3, the control terminal of which is connected to the enabling signal Subpower_EN, and the output terminal of which is connected to the control terminal of the input submodule (120). The switch Q3 is used to turn on the enabling signal Subpower_EN based on the first level signal or to turn off the enabling signal Subpower_EN based on the second level signal.

7. The circuit according to claim 5, characterized in that, The input submodule (120) includes a switch Q1, the control terminal of which is connected to the output terminal of the enable submodule (110), the input terminal of which receives an input voltage VIN, and the output terminal of which is connected to the input terminal of the start-up submodule (130). The switch Q1 is used to output the first voltage signal when the enable signal Subpower_EN, which is a first-level signal, is input to the enable submodule (110); or to output the second voltage signal when the enable signal Subpower_EN, which is a second-level signal, is input to the enable submodule (110).

8. The circuit according to claim 5, characterized in that, The startup submodule (130) is also used to adjust the magnitude of the startup voltage output to the signal generator (300) when the first voltage signal output by the input submodule (120) is greater than the voltage threshold. The startup submodule (130) includes: A switching transistor Q2 is connected to the first end of the input submodule (120), the output end of the switching transistor Q2 is connected to the input end of the signal generator (300), and a Zener diode DZ2 is connected to the control end of the switching transistor Q2. When the first voltage signal output by the input submodule (120) is greater than the voltage threshold, the Zener diode DZ2 adjusts the magnitude of the start-up voltage output by the switching transistor Q2 to the signal generator (300).

9. An auxiliary power supply circuit, characterized in that, include: The startup circuit as described in any one of claims 1-8, wherein the signal generator is a PWM signal generator; A transformer, the input of which is connected to the output of the startup module and the PWM signal generator.

10. An electronic device, characterized in that, Includes the auxiliary power supply circuit as described in claim 9.

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