Starting-up circuit
By introducing control modules and drain modules into the power-on circuit, the problem of incomplete charge discharge during rapid up-and-down power is solved, and higher reliability and stability are achieved.
Patent Information
- Application Number
- CN202421940401.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-09
AI Technical Summary
During the rapid power-up and down process, the existing power-on circuit cannot effectively discharge internal charge, resulting in abnormal timing of the switch module and the inability to control the power-on and start of the communication module.
A power-on circuit is designed, including a power supply module, a communication module, a power-off module, a control module, a first discharge module and a second discharge module. By outputting control signals during the power-off state by the control module, the first discharge module and the second discharge module are used to accelerate the discharge of charge.
It effectively accelerates the discharge of charge, improves the reliability of the power-on circuit, and avoids timing abnormalities caused by the unleashed charge.
Smart Images
Figure CN223024297U_ABST
Abstract
Description
Technical Field
[0001] Embodiments of the present disclosure relate to the field of circuits, and particularly to a power-on circuit. Background Art
[0002] With the rapid development of electronic technology, there are more and more electronic devices that can automatically power on and off. However, for these electronic devices, some internal electronic components may still carry charges. For example, a capacitor may retain charges. If these charges cannot be discharged to a safe range, safety risks will occur.
[0003] It is necessary to provide a power-on circuit that can accelerate charge discharge. Utility Model Content
[0004] Embodiments of the present disclosure provide a power-on circuit that can at least accelerate charge discharge.
[0005] According to some embodiments of the present disclosure, on the one hand, an embodiment of the present disclosure provides a power-on circuit, including: a power supply module, the power supply module including a power-on state and a power-off state; a communication module, the communication module being electrically connected to the power supply module and operating in the power-on state; a power-on / off module, one end of the power-on / off module being electrically connected to the power supply module and the other end being electrically connected to the communication module, controlling the communication module to power on in the power-on state and controlling the communication module to power off in the power-off state; a control module, the control module being electrically connected to the power supply module and outputting a control signal in the power-off state; a first discharge module, the first discharge module being electrically connected to the control module, receiving the control signal, and used for discharging the charges of the power supply module and the power-on / off module; a second discharge module, the second discharge module being electrically connected to the power-on / off module and used for discharging the charges of the power-on / off module in the power-off state.
[0006] In some embodiments, the control module includes: a first control circuit, one end of the first control circuit being electrically connected to the power supply module and the other end being electrically connected to the first discharge module; a second control circuit, a first end of the second control circuit being electrically connected to the power supply module, a second end being electrically connected to the first control circuit and the first discharge module, and a third end being electrically connected to the ground terminal. In the power-on state, the second control circuit conducts the path between the first control circuit and the first discharge module and the ground terminal.
[0007] In some embodiments, the first control circuit includes: a first diode, a positive electrode of the first diode being electrically connected to the power supply module and a negative electrode being electrically connected to the first discharge module; a first capacitor, one end of the first capacitor being electrically connected to the negative electrode of the first diode and the other end being electrically connected to the ground terminal.
[0008] In some embodiments, the first control circuit further includes: a first resistor, one end of the first resistor is electrically connected to the negative electrode of the first diode, and the other end is electrically connected to the first discharge module.
[0009] In some embodiments, the second control circuit includes: a second capacitor, one end of the second capacitor is electrically connected to the power supply module; a first triode, the base of the first triode is electrically connected to the other end of the second capacitor, the emitter of the first triode is electrically connected to the ground terminal, and the collector is electrically connected to the first discharge module; a second resistor, one end of the second resistor is electrically connected to the power supply module, and the other end is electrically connected to the base of the first triode; a third resistor, one end of the third resistor is electrically connected to the other end of the second resistor, and the other end is electrically connected to the ground terminal.
[0010] In some embodiments, the capacitance value of the second capacitor is 1 pF to 1 nF, and / or, the resistance value of the second resistor is 1 kΩ to 1 MΩ, and / or, the resistance value of the third resistor is 1 kΩ to 1 MΩ.
[0011] In some embodiments, the power-on / off module includes: a third capacitor, one end of the third capacitor is electrically connected to the power supply module; a second triode, the base of the second triode is electrically connected to the other end of the third capacitor, the emitter is electrically connected to the ground terminal, and the collector is electrically connected to the communication module.
[0012] In some embodiments, the second discharge module includes: a second diode, the positive electrode of the second diode is electrically connected to the emitter of the second triode, and the negative electrode is electrically connected to the other end of the third capacitor.
[0013] In some embodiments, the first discharge module includes: an NMOS transistor, the gate of the NMOS transistor is electrically connected to the control module to receive the control signal, the source of the NMOS transistor is electrically connected to the power supply module, and the drain of the NMOS transistor is electrically connected to the ground terminal.
[0014] In some embodiments, the first discharge module further includes: a fourth resistor, one end of the fourth resistor is electrically connected to the power supply module, and the other end is electrically connected to the source of the NMOS transistor; and / or, a fifth resistor, one end of the fifth resistor is electrically connected to the control module, and the other end is electrically connected to the ground terminal.
[0015] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages: The power-on state and power-off state of the power supply module respectively provide power and do not provide power. The communication module is the part that needs to operate in the circuit. The power-on and off module is used to control whether the communication module works. When the power supply module provides power, the power-on and off module controls the communication module to turn on and work. When the power supply module does not provide power, the power-on and off module controls the communication module to turn off and stop working. The control module is used to control whether the first discharge module is connected, and control whether the charges in the power supply module and the power-on and off module are discharged through the first discharge module. The second discharge module disconnects the discharge path when the power supply module is in the power-on state and conducts the discharge path when in the power-off state. When in the power-off state, the first discharge module and the second discharge module can accelerate the release of charges in the entire circuit, thereby improving the reliability of the entire power-on circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments unless otherwise stated. The figures in the drawings do not constitute a proportional limitation; To more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following-described drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0017] Figure 1 It is a block diagram of a power-on circuit provided by an embodiment of the present disclosure;
[0018] Figure 2 It is a circuit diagram of a power-on circuit provided by an embodiment of the present disclosure;
[0019] Figure 3 It is a signal waveform diagram of each node when a power supply in a power-on circuit provided by an embodiment of the present disclosure is in the power-on state;
[0020] Figure 4 It is a signal waveform diagram of each node when a power supply in a power-on circuit provided by an embodiment of the present disclosure is in the power-off state. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] As can be seen from the background art, in the special operation of quickly powering on and off in a short time for the current power-on circuit, due to the fact that the charges accumulated in the power-on and off module and the control module cannot be completely released, the timing of the power-on and off module is abnormal, and the communication module cannot be controlled to power on.
[0022] An embodiment of the present disclosure provides a power-on circuit. The power-on state and power-off state of the power supply module respectively provide power and do not provide power. The communication module is the part that needs to operate in the circuit. The power-on and-off module is used to control whether the communication module works. When the power supply module provides power, the power-on and-off module controls the communication module to power on and work. When the power supply module does not provide power, the power-on and-off module controls the communication module to power off and stop working. The control module is used to control whether the first discharge module is connected, and control whether the charges in the power supply module and the power-on and-off module are discharged through the first discharge module. The second discharge module disconnects the discharge path when the power supply module is in the power-on state and conducts the discharge path when in the power-off state. Through the first discharge module and the second discharge module, the release of charges in the entire circuit can be accelerated in the power-off state, thereby improving the reliability of the entire power-on circuit.
[0023] Terms such as first or second can be used to describe various components, but these components are not limited by the above terms. The above terms are used to distinguish one component from another. For example, without departing from the scope of the concept according to the present disclosure, the first component can be referred to as the second component, and similarly, the second component can be referred to as the first component.
[0024] In addition, "connected / coupled" means that one component is directly electrically coupled to another component or indirectly electrically coupled through another component. As long as it is not explicitly stated in the sentence, the singular form can include the plural form. In addition, "comprising / including" or "comprises / includes" used in this specification means that there is or has been added one or more components, steps, operations, and elements. The specific structural or functional descriptions of the examples of the embodiments according to the concepts disclosed in this specification are only illustrated to describe the examples of the embodiments according to the concepts, and the examples of the embodiments according to the concepts can be implemented in various forms, but these descriptions are not limited to the examples of the embodiments described in this specification.
[0025] According to the concept, various modifications and changes can be applied to the examples of the embodiments, so that the examples of the embodiments will be illustrated in the drawings and described in the specification. However, the examples of the embodiments according to the concept are not limited to the specific embodiments, but include all changes, equivalents, or replacements included in the spirit and technical scope of the present disclosure.
[0026] It should be understood that when describing that an element is "coupled" or "connected" to another element, the element can be directly coupled or directly connected to the other element, or can be coupled or connected to the other element through a third element. Conversely, it should be understood that when an element is referred to as being "directly connected to" or "directly coupled to" another element, no other element is disposed therebetween. Other expressions describing the relationship between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") are to be interpreted in the same manner.
[0027] The terms used in this specification are only for describing specific examples of the embodiments and are not intended to limit the present disclosure. If there is no clear contrary meaning in the context, the singular form may include the plural form. In this specification, it should be understood that the terms "comprising" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.
[0028] If there is no contrary definition, all terms used herein (including technical terms or scientific terms) have the same meaning as generally understood by those of ordinary skill in the art. If the terms defined in the common dictionary are not clearly defined in this specification, they should be interpreted as having the same meaning as in the context of the relevant technology, and not as having an ideal or overly formal meaning.
[0029] Descriptions of well-known components and processing techniques may be omitted so as not to unnecessarily obscure the embodiments of the present disclosure.
[0030] Throughout the specification, the same reference numerals refer to the same elements. Therefore, even if a reference numeral is not mentioned or described with reference to one drawing, it may be referred to or described with reference to another drawing. In addition, even if a reference numeral is not shown in one drawing, it may be referred to or described with reference to another drawing.
[0031] In addition, the logic level of a signal may be different from or opposite to the described logic level. For example, a signal described as having a logic "high" level may alternatively have a logic "low" level, and a signal described as having a logic "low" level may alternatively have a logic "high" level.
[0032] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are provided to help readers better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present disclosure can still be implemented.
[0033] Reference Figure 1 And Figure 2 , where Figure 1 is a block diagram of a power-on circuit provided by an embodiment of the present disclosure, Figure 2 is a circuit diagram of a power-on circuit provided by an embodiment of the present disclosure.
[0034] In some embodiments, the power-on circuit may include: a power supply module 100, and the power supply module 100 includes a power-on state and a power-off state.
[0035] The power-on circuit may further include: a communication module 101, the communication module 101 is electrically connected to the power supply module 100 and operates in the power-on state.
[0036] The power-on circuit may further include: a power-on / off module 102, one end of the power-on / off module 102 is electrically connected to the power supply module 100, and the other end is electrically connected to the communication module 101. In the power-on state, it controls the communication module 101 to power on, and in the power-off state, it controls the communication module 101 to power off.
[0037] The power-on circuit may further include: a control module 103, the control module 103 is electrically connected to the power supply module 100 and outputs a control signal in the power-off state.
[0038] The power-on circuit may further include: a first discharge module 104, the first discharge module 104 is electrically connected to the control module 103, receives the control signal, and is used to discharge the charges of the power supply module 100 and the power-on / off module 102.
[0039] The power-on circuit may further include: a second discharge module 105, the second discharge module 105 is electrically connected to the power-on / off module 102, and is used to discharge the charges of the power-on / off module 102 in the power-off state.
[0040] In the embodiments of the present disclosure, the power-on state and the power-off state of the power supply module 100 respectively correspond to providing power and not providing power. The communication module 101 is the part that needs to operate in the circuit. The power-on / off module 102 is used to control whether the communication module 101 works. When the power supply module 100 provides power, the power-on / off module 102 controls the communication module 101 to power on and work. When the power supply module 100 does not provide power, the power-on / off module 102 controls the communication module 101 to power off and stop working. The control module 103 is used to control whether the first discharge module 104 is connected, and control whether the charges in the power supply module 100 and the power-on / off module 102 are discharged through the first discharge module 104. The second discharge module 105 disconnects the discharge path when the power supply module 100 is in the power-on state and conducts the discharge path when in the power-off state. The first discharge module 104 and the second discharge module 105 can accelerate the release of charges in the entire circuit, thereby improving the reliability of the entire power-on circuit.
[0041] In some embodiments, the control module 103 may include: a first control circuit 113, one end of the first control circuit 113 is electrically connected to the power supply module 100, and the other end is electrically connected to the first discharge module 104; a second control circuit 123, the first end of the second control circuit 123 is electrically connected to the power supply module 100, the second end is electrically connected to the first control circuit 113 and the first discharge module 104, and the third end is electrically connected to the ground terminal. When in the power-on state, the second control circuit 123 conducts the path between the first control circuit 113 and the first discharge module 104 and the ground terminal.
[0042] When the power supply module 100 is in the power-on state, the second control circuit 123 conducts the path between the first control circuit 113 and the first discharge module 104 and the ground terminal, resulting in the signal of the first control circuit 113 not being provided to the first discharge module 104, causing the first discharge module 104 not to work. When the power supply module 100 is in the power-off state, the path between the first control circuit 113 and the first discharge module 104 and the ground terminal is disconnected, and the signal of the first control circuit 113 can be provided to the first discharge module 104, and the first discharge module 104 works. The charges in the power-on / off module 102 and the control module 103 are quickly discharged through the first discharge module 104, which can improve the reliability of the entire power-on circuit.
[0043] In some embodiments, the first control circuit 113 includes: a first diode D1, the positive electrode of the first diode D1 is electrically connected to the power supply module 100, and the negative electrode is electrically connected to the first discharge module 104; a first capacitor C1, one end of the first capacitor C1 is electrically connected to the negative electrode of the first diode D1, and the other end is electrically connected to the ground terminal. It can be understood that the characteristic of the first diode D1 is unidirectional transmission. Therefore, when the power supply module 100 is powered on, due to the limitation of the first diode D1, the first capacitor C1 receives an electrical signal and stores charge. The first control circuit 113 is electrically connected to the first discharge module 104 and transmits a high-level signal to the first discharge module 104. However, when the power supply module 100 is powered on, due to the existence of the second control circuit 123, the first control circuit 113 is also connected to the ground terminal. Therefore, the high-level signal transmitted by the first control circuit 113 will be pulled low by the ground terminal. In the power-off state, the path between the first control circuit 113 and the ground terminal is disconnected. Moreover, since the first control circuit 113 includes the first capacitor C1, in the power-off state, the first capacitor C1 discharges the charge. And due to the existence of the first diode D1, the current of the first capacitor C1 is limited to flow only to the first discharge module 104 and cannot flow through the first diode D1 to the second control circuit 123. Therefore, in the power-off state, the first control circuit 113 provides an electrical signal to the first discharge module 104, and the first discharge module 104 conducts, and the charge of the power-on and off module 102 and the power supply module 100 is discharged through the first discharge module 104.
[0044] In some embodiments, the first control circuit 113 further includes: a first resistor R1, one end of the first resistor R1 is electrically connected to the negative electrode of the first diode D1, and the other end is electrically connected to the first discharge module 104. By setting the first resistor R1, the flowing current can be limited, thereby protecting the first control circuit 113.
[0045] In some embodiments, the resistance value of the first resistor R1 and the capacitance value of the first capacitor C1 can determine the time for the first control circuit 113 to provide an electrical signal to the first discharge module 104. Therefore, the resistance value of the first resistor R1 and the capacitance value of the first capacitor C1 can be selected according to the actual situation.
[0046] In some embodiments, the second control circuit 123 may include: a second capacitor C2, one end of the second capacitor C2 is electrically connected to the power supply module 100; a first triode Q1, the base of the first triode Q1 is electrically connected to the other end of the second capacitor C2, the emitter of the first triode Q1 is electrically connected to the ground terminal, and the collector is electrically connected to the first discharge module 104; a second resistor R2, one end of the second resistor R2 is electrically connected to the power supply module 100, and the other end is electrically connected to the base of the first triode Q1; a third resistor R3, one end of the third resistor R3 is electrically connected to the other end of the second resistor R2, and the other end is electrically connected to the ground terminal.
[0047] When the power supply module 100 transitions from the power-down state to the power-on state, due to the leading effect of the second capacitor C2, the first triode Q1 will be quickly turned on, causing the path between the first discharge module 104 and the ground terminal to be quickly turned on. In this way, the signal of the first control circuit 113 will be transmitted to the ground terminal, and the first discharge module 104 and the first control circuit 113 will not function. When the power supply module 100 is powered down, the first triode Q1 is cut off, and at this time, the first discharge module 104 is controlled by the first control circuit 113.
[0048] For the second resistor R2 and the third resistor R3, the voltage provided by the power supply module 100 is divided by the second resistor R2 and the third resistor R3 and then provided to the base of the first triode Q1. When the power supply module 100 is just powered down, the base of the first triode Q1 is still at a high level and remains in the conducting state, so the first discharge module 104 still remains in the cut-off state. As the system discharges, after the power supply module 100 is lower than the operating voltage of the system, other devices in the system no longer discharge the power supply module 100. At this time, the charge accumulated in the circuit of the system is slowly released through the path of the second resistor R2 and the third resistor R3 to the ground terminal until the base voltage of the first triode Q1 is less than its conduction voltage Vbe (usually 0.7V), and the first triode Q1 begins to be cut off, thus turning on the first discharge module 104. After that, the charge accumulated in the circuit is quickly discharged through the first discharge module 104.
[0049] In some embodiments, the capacitance value of the second capacitor C2 is 1 pF to 1 nF, and / or the resistance value of the second resistor R2 is 1 kΩ to 1 MΩ, and / or the resistance value of the third resistor R3 is 1 kΩ to 1 MΩ. By setting the capacitance value of the second capacitor C2 to be 1 pF to 1 nF, and / or the resistance value of the second resistor R2 to be 1 kΩ to 1 MΩ, and / or the resistance value of the third resistor R3 to be 1 kΩ to 1 MΩ, the extra current consumption caused by the path formed by the second resistor R2 and the third resistor R3 can be avoided.
[0050] In some embodiments, the sum of the resistance values of the second resistor R2 and the third resistor R3 should not be too large to avoid too slow charge release when the power supply module 100 is powered down. At the same time, the detection threshold voltage needs to be set according to actual requirements, and it should be controlled that the detected voltage is slightly greater than the conduction voltage of the first triode Q1 (i.e., the base voltage) after being divided by the second resistor R2 and the third resistor R3, near its conduction voltage.
[0051] In some embodiments, the ratio of the resistance value of the second resistor R2 to the resistance value of the third resistor R3 needs to meet certain conditions, and the specific situation can be adjusted according to the conduction voltage of the first triode Q1. Taking the conduction voltage of the first triode Q1 as 0.7V as an example, the resistance value of the second resistor R2 and the resistance value of the third resistor R3 can be 4:1.
[0052] In some embodiments, the power-on / off module 102 includes: a third capacitor C3, one end of the third capacitor C3 is electrically connected to the power supply module 100; a second triode Q2, the base of the second triode Q2 is electrically connected to the other end of the third capacitor C3, the emitter is electrically connected to the ground terminal, and the collector is electrically connected to the communication module 101.
[0053] When the power supply module 100 is in the powered-on state, due to the characteristic that the voltage difference across the third capacitor C3 cannot change suddenly, the third capacitor C3 is in a short-circuit state at the moment of power-on. Both ends of the third capacitor C3 are the voltage of the power supply module 100, and as the third capacitor C3 charges, the voltage at the right end of the third capacitor C3 gradually decreases to 0V. During the charging process, the base of the second triode Q2 is at a high level, the second triode Q2 conducts, and the communication module 101 is conducted to the ground terminal. When the voltage at the right end of the third capacitor C3 drops below the conduction voltage of the second triode Q2 during charging, the second triode Q2 cuts off, and the path between the power-on / off module 102 and the ground terminal is disconnected. The communication module 101 receives a high-level signal and is in the working state; when the power supply module 100 changes from the powered-on state to the powered-off state, the third capacitor C3 discharges the charge and supplies it to the second triode Q2, causing the second triode Q2 to conduct, and the communication module 101 is conducted to the ground terminal, and the communication module 101 stops working.
[0054] In some embodiments, the second discharge module 105 includes: a second diode D2, the positive electrode of the second diode D2 is electrically connected to the emitter of the second triode Q2, and the negative electrode is electrically connected to the other end of the third capacitor C3. For the second diode D2, when the power supply module 100 is in the powered-on state, due to the unidirectional conductivity of the second diode D2, the path between the power supply module 100 and the ground terminal is disconnected. When the power supply module 100 is in the powered-off state, the negative charge accumulated in the third capacitor C3 is discharged to the ground terminal through the second diode D2, and the positive charge accumulated in the third capacitor C3 is discharged through the first discharge module 104.
[0055] In some embodiments, the first discharge module 104 includes: an NMOS transistor Q3, the gate of the NMOS transistor Q3 is electrically connected to the control module 103 to receive a control signal, the source of the NMOS transistor Q3 is electrically connected to the power supply module 100, and the drain of the NMOS transistor Q3 is electrically connected to the ground terminal.
[0056] For the first discharge module 104, when the power supply module 100 is in the powered-on state, due to the presence of the control module 103, the connection path between the power supply module 100 and the gate of the NMOS transistor Q3 is disconnected, and the control module 103 does not input a control signal to the NMOS transistor Q3. Therefore, the NMOS transistor Q3 is turned off, and the path between the power supply module 100 and the ground terminal is disconnected; when the power supply module 100 is in the powered-off state, the control module 103 inputs a control signal to the NMOS transistor Q3, the NMOS transistor Q3 is turned on, and the path between the power supply module 100 and the ground terminal is turned on. When the power supply module 100 is in the powered-off state, the charge in the power supply module 100 will be discharged through the ground terminal.
[0057] In some embodiments, when the power supply module 100 is in the powered-off state, the NMOS transistor Q3 is turned on, and the charge accumulated in the power-on / off module 102 is also discharged through the path between the NMOS transistor Q3 and the ground terminal.
[0058] In some embodiments, the first discharge module 104 further includes: a fourth resistor R4, one end of the fourth resistor R4 is electrically connected to the power supply module 100, and the other end is electrically connected to the source of the NMOS transistor Q3; and / or, a fifth resistor R5, one end of the fifth resistor R5 is electrically connected to the control module 103, and the other end is electrically connected to the ground terminal.
[0059] For the fourth resistor R4, the fourth resistor R4 plays a role in current limiting to protect the NMOS transistor Q3; for the fifth resistor R5, the fifth resistor R5 can fix the level of the NMOS transistor Q3 and also facilitate the discharge of charge from the gate of the NMOS transistor Q3.
[0060] In some embodiments, the resistance value of the fourth resistor R4 can be less than 100 Ω, so as to avoid affecting the discharge speed of the charge in the power supply module 100.
[0061] A detailed description of an embodiment of the present disclosure will be given below: When the power supply module 100 is in the powered-on state, the third capacitor C3 in the power-on and off module 102 will conduct briefly first and then disconnect. The second triode Q2 receives a high-level signal when the third capacitor C3 conducts, causing the signal received on the communication module 101 to be pulled low by the ground terminal first, and then the connection with the ground terminal is disconnected. The signal received by the communication module 101 is pulled high by the internal pull-up circuit, and the communication module 101 starts to work. The first control circuit 113 and the second control circuit 123 also conduct, but the gate of the NMOS transistor Q3 in the first discharge module 104 will be pulled low by the ground terminal connected to the second control circuit 123, resulting in the non-conduction of the NMOS transistor Q3 in the first discharge module 104, and the first discharge module 104 does not work. Due to the unidirectional conduction property, the second diode D2 of the second discharge module 105 also does not work. When the power supply module 100 is in the powered-off state, the charged particles in the third capacitor C3 are released, controlling the second triode Q2 to conduct, pulling the communication module 101 low and stopping it from working. At the same time, the negative charge at the right end of the third capacitor C3 is discharged to the ground terminal through the second discharge module 105, and the charge at the left end of the third capacitor C3 is discharged to the ground terminal through the first control circuit 113 and the second control circuit 123. Moreover, the first capacitor C1 in the first control circuit 113 also releases charge and transmits it to the gate of the NMOS transistor Q3, controlling the NMOS transistor Q3 to conduct. The charge in the power supply module 100 can be discharged to the ground terminal through the NMOS transistor Q3. Similarly, the first capacitor C1 and the third capacitor C3 are also discharged to the ground terminal through the NMOS transistor Q3, thus accelerating the discharge of the charge in the power-on and off module 102 and the control module 103.
[0062] With reference to Figure 2 、 Figure 3 and Figure 4 , where Figure 3 is the signal waveform diagram of each node when the power supply of the power-on circuit provided by the embodiment of the present disclosure is in the powered-on state, Figure 4 is the signal waveform diagram of each node when the power supply of the power-on circuit provided by the embodiment of the present disclosure is in the powered-off state.
[0063] It should be noted that NMOS-Q3_G represents the powered-on waveform of the gate of the NMOS transistor Q3 in the first discharge module 104, and BJT-Q2_B represents the powered-on waveform of the base of the second triode Q2 in the power-on and off module 102.
[0064] When the power supply module 100 is powered on, due to the characteristic that the voltage across the third capacitor C3 cannot change suddenly, the levels at both ends of the third capacitor C3 in the power-on and -off module 102 are pulled high simultaneously as the power supply module 100 is powered on. As a result, the base of the second triode Q2 becomes a high level, and the second triode Q2 conducts to pull down the signal transmitted to the communication module 101 to the ground terminal. As the third capacitor C3 charges, the base voltage of the second triode Q2 gradually decreases to a level lower than the conduction voltage, and the second triode Q2 cuts off, stopping the control of the signal transmitted to the communication module 101. Due to the action of the second control circuit 123, the gate of the NMOS transistor Q3 is always at a low level, and the first discharge module 104 remains in the cut-off state; when the power supply module 100 is powered on, since the signal transmitted to the communication module 101 is usually powered by the power supply module 100, the power-off waveform is consistent with the waveform of the power supply module 100. It can be seen that when the power supply module 100 is powered off, due to the discharge of the system in a short period of time, the voltage of the power supply module 100 will show a downward trend. However, at this time, it has not yet dropped below the detection threshold of the second control circuit 123. Therefore, the base of the first triode Q1 in the second control circuit 123 is still at a high level and remains conducting, that is, the first discharge module 104 is still in the cut-off state. When the system continues to discharge to a level lower than the operating voltage and stops working, at this time, the charge is connected to the ground terminal via the second resistor R2 and the third resistor R3 and continues to discharge until the base of the first triode Q1 is lower than the conduction voltage, and the first triode Q1 cuts off. At this time, due to the action of the first capacitor C1 in the first control circuit 113, the first discharge module 104 starts to conduct. Therefore, the charge of the power supply module 100 and the power-on and -off module 102 starts to be rapidly released, which is reflected in the rapid decrease of the waveform of the power supply module 100. At the same time, because the voltage across the capacitor cannot change suddenly, when the charge is discharged, the positive charge at the left end of the third capacitor C3 is rapidly released, and the level rapidly decreases. The voltage on the right side of the third capacitor C3 will also drop from 0V to a negative voltage. It can be seen that the base level of the second triode Q2 in the automatic power-on circuit drops instantaneously to a negative level. In order to protect the second triode Q2 and avoid confusion in the power-on sequence next time, a second discharge module 105 is also designed. Due to the action of the second discharge module 105, a discharge path is provided for the negative charge. It can be seen that the amplitude of the negative level in the above waveform is relatively low, the duration is short, and it will not be too low, and it is always clamped at a voltage near 0V by the second discharge module 105.
[0065] In the embodiments of the present disclosure, the power-on state and the power-off state of the power supply module 100 respectively correspond to providing power and not providing power. The communication module 101 is the part that needs to operate in the circuit. The power-on / off module 102 is used to control whether the communication module 101 works. When the power supply module 100 provides power, the power-on / off module 102 controls the communication module 101 to power on and work. When the power supply module 100 does not provide power, the power-on / off module 102 controls the communication module 101 to power off and stop working. The control module 103 is used to control whether the first discharge module 104 is connected, and control whether the charges in the power supply module 100 and the power-on / off module 102 are discharged through the first discharge module 104. The second discharge module 105 disconnects the discharge path when the power supply module 100 is in the power-on state and conducts the discharge path when in the power-off state. Through the first discharge module 104 and the second discharge module 105, the release of charges in the entire circuit can be accelerated, thereby improving the reliability of the entire power-on circuit.
[0066] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present disclosure. In practical applications, various changes can be made in form and details without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be subject to the scope defined by the claims.
Claims
1. A power-on circuit, characterized in that: include: A power module, wherein the power module includes a power-on state and a power-off state; a communication module, the communication module being electrically connected to the power module and operating in the power-on state; A power on / off module, one end of which is electrically connected to the power module, and the other end of which is electrically connected to the communication module, and controls the communication module to start up when in the power-on state, and controls the communication module to shut down when in the power-off state; a control module, the control module being electrically connected to the power module and outputting a control signal in the power-off state; a first discharge module, the first discharge module being electrically connected to the control module, receiving the control signal, and being used to discharge the charges of the power module and the switch module; The second discharge module is electrically connected to the power on / off module and is used to discharge the charge of the power on / off module in the power off state.
2. The power-on circuit according to claim 1, characterized in that: The control module comprises: a first control circuit, wherein one end of the first control circuit is electrically connected to the power module, and the other end of the first control circuit is electrically connected to the first discharge module; A second control circuit, wherein a first end of the second control circuit is electrically connected to the power module, a second end is electrically connected to the first control circuit and the first discharge module, and a third end is electrically connected to the ground. In the power-on state, the second control circuit conducts a path between the first control circuit and the first discharge module and the ground.
3. The power-on circuit according to claim 2, characterized in that: The first control circuit comprises: a first diode, wherein the anode of the first diode is electrically connected to the power module, and the cathode of the first diode is electrically connected to the first discharge module; A first capacitor, wherein one end of the first capacitor is electrically connected to the cathode of the first diode, and the other end of the first capacitor is electrically connected to the ground.
4. The power-on circuit according to claim 3, characterized in that: The first control circuit further includes: A first resistor, one end of the first resistor is electrically connected to the cathode of the first diode, and the other end of the first resistor is electrically connected to the first discharge module.
5. The power-on circuit according to claim 2, characterized in that: The second control circuit comprises: a second capacitor, one end of which is electrically connected to the power module; a first transistor, wherein a base of the first transistor is electrically connected to the other end of the second capacitor, an emitter of the first transistor is electrically connected to a ground terminal, and a collector is electrically connected to the first discharge module; a second resistor, one end of which is electrically connected to the power module, and the other end of which is electrically connected to the base of the first transistor; A third resistor, one end of the third resistor is electrically connected to the other end of the second resistor, and the other end of the third resistor is electrically connected to the ground.
6. The power-on circuit according to claim 5, characterized in that: The capacitance of the second capacitor is 1pF to 1nF, and / or the resistance of the second resistor is 1KΩ to 1MΩ, and / or the resistance of the third resistor is 1KΩ to 1MΩ.
7. The power-on circuit according to claim 1, characterized in that: The switch module comprises: a third capacitor, one end of which is electrically connected to the power module; A second transistor, wherein the base of the second transistor is electrically connected to the other end of the third capacitor, the emitter is electrically connected to the ground, and the collector is electrically connected to the communication module.
8. The power-on circuit according to claim 7, characterized in that: The second discharge module comprises: A second diode, wherein the anode of the second diode is electrically connected to the emitter of the second transistor, and the cathode of the second diode is electrically connected to the other end of the third capacitor.
9. The power-on circuit according to claim 1, characterized in that: The first discharge module comprises: An NMOS tube, wherein the gate of the NMOS tube is electrically connected to the control module to receive the control signal, the source of the NMOS tube is electrically connected to the power module, and the drain of the NMOS tube is electrically connected to the ground.
10. The power-on circuit according to claim 9, characterized in that: The first discharge module further includes: a fourth resistor, one end of which is electrically connected to the power module, and the other end of which is electrically connected to the source of the NMOS tube; and / or, A fifth resistor, one end of which is electrically connected to the control module, and the other end of which is electrically connected to the ground.