Surge-protected bandgap reference source circuits and electronic equipment

Abstract

This application provides a surge-protected bandgap reference source circuit and electronic device. The circuit comprises a startup circuit, a control circuit, and a shunt circuit, with the first terminals connected to a power supply. The second terminal of the startup circuit is connected to the control circuit. The control circuit is connected to the second terminal of the startup circuit. The second terminal of the shunt circuit is connected to both the startup circuit and the control circuit. The third terminal of the shunt circuit is connected to the electronic device and ground. When a power surge occurs, the power supply provides a first electrical signal to the startup circuit, which then conducts under the influence of the first signal. The second terminal of the startup circuit provides a second electrical signal to the control circuit. The power supply provides a third electrical signal to the first terminal of the control circuit. Under the influence of the second and third electrical signals, the voltage difference in the control circuit increases, and a fourth electrical signal is provided to the second terminal of the shunt circuit, causing the shunt circuit to conduct. This dissipates some current through the ground wire, reducing the current to the electronic device and effectively protecting the electronic device connected to the bandgap reference source circuit.

Description

Technical Field

[0001] This application relates to the field of circuit design technology, and in particular to a surge-proof bandgap reference source circuit and electronic device. Background Technology

[0002] In circuit design, a surge refers to the powerful pulse generated within the power supply the instant it is switched on, as well as external pulses received by the power supply and other parts of the circuit, including surge voltage and surge current. Circuits are highly susceptible to damage during a surge, such as PN junction capacitor breakdown, resistor burnout, and MOSFET breakdown.

[0003] Bandgap reference circuits, as an important basic component in analog integrated circuits, are often used to provide accurate reference voltages or currents to other circuit modules. When a surge occurs, a bandgap reference circuit can supply excessively high voltages or currents to other circuit modules, potentially causing damage to those modules due to the surge current. Summary of the Invention

[0004] This application provides a surge-protected bandgap reference source circuit that can effectively protect the circuit modules connected to the bandgap reference source circuit.

[0005] This invention provides a surge-protected bandgap reference source circuit, which is connected to electronic devices and includes: a power supply, a startup circuit, a control circuit, and a shunt circuit.

[0006] The first terminal of the starting circuit is connected to the power supply, the second terminal of the starting circuit is connected to the control circuit, and the third terminal of the starting circuit is connected to the ground wire.

[0007] The first terminal of the control circuit is connected to the power supply, the second terminal of the control circuit is connected to the starting circuit, and the third terminal of the control circuit is connected to the ground wire.

[0008] The first end of the shunt circuit is connected to the power supply, the second end of the shunt circuit is connected to the startup circuit and the control circuit, and the third end of the shunt circuit is connected to the electronic device and the ground wire respectively.

[0009] When a power surge occurs, a first electrical signal is provided to the startup circuit through the power supply. The startup circuit is turned on under the action of the first electrical signal, and the second terminal of the startup circuit provides a second electrical signal to the control circuit.

[0010] The power supply provides a third electrical signal to the first terminal of the control circuit. Under the action of the second and third electrical signals, the voltage difference of the control circuit increases and provides a fourth electrical signal to the second terminal of the shunt circuit. Under the action of the fourth electrical signal, the shunt circuit is turned on, and part of the current is consumed through the ground wire to reduce the current of the electronic device.

[0011] In the above scheme, the shunt circuit includes: a first MOSFET and a differential voltage shunt circuit;

[0012] The first terminal of the first MOSFET is connected to the power supply, the second terminal of the first MOSFET is connected to the startup circuit, and the third terminal of the first MOSFET is connected to the first terminal of the differential voltage shunt circuit and the electronic device, respectively.

[0013] The second terminal of the differential pressure shunt circuit is connected to the control circuit, and the third terminal of the differential pressure shunt circuit is connected to the ground wire.

[0014] When a power surge occurs, the control circuit provides a fifth electrical signal to the second terminal of the differential voltage shunt circuit under the action of the second and third electrical signals. The differential voltage shunt circuit is turned on under the action of the fifth electrical signal. The first terminal of the first MOSFET is turned on under the action of the sixth electrical signal provided by the power supply and the second terminal of the first MOSFET is turned on by the second electrical signal, forming a large current. The differential voltage shunt circuit consumes part of the current at the third terminal of the first MOSFET through the ground wire to reduce the current of the electronic device.

[0015] In the above scheme, the differential voltage shunt includes: a second MOSFET and a third MOSFET;

[0016] The first end of the second MOSFET is connected to the third end of the first MOSFET, the second end of the second MOSFET is connected to the first node of the control circuit, the third end of the second MOSFET is connected to the first end of the third MOSFET, the second end of the third MOSFET is connected to the second node of the control circuit, and the third end of the third MOSFET is connected to the ground wire.

[0017] When a power surge occurs, the control circuit, under the action of the second and third electrical signals, sends a first differential voltage signal to the second terminal of the second MOSFET through the first node and a second differential voltage signal to the second terminal of the third MOSFET through the second node. The second and third MOSFETs are turned on under the action of the first and second differential voltage signals, dissipating part of the current through the ground wire to reduce the current of the electronic device. The first differential voltage signal voltage is greater than the threshold voltage of the second MOSFET, and the second differential voltage signal voltage is greater than the threshold voltage of the third MOSFET.

[0018] In the above scheme, the startup circuit includes: a second startup circuit and a fourth MOS transistor;

[0019] The first terminal of the second startup circuit is connected to the power supply, the second terminal of the fourth MOSFET is connected to the second startup circuit, the first terminal of the fourth MOSFET is connected to the control circuit and the second terminal of the shunt circuit, the third terminal of the fourth MOSFET is connected to the second startup circuit, and the second terminal of the second startup circuit is connected to the ground wire.

[0020] When a power surge occurs, the power supply provides a first electrical signal to the second startup circuit. The second startup circuit sends the first electrical signal to the second terminal of the fourth MOS transistor. The fourth MOS transistor is turned on under the action of the first electrical signal. The first terminal of the fourth MOS transistor provides a second electrical signal to the control circuit. The voltage of the first electrical signal is greater than the threshold voltage of the fourth MOS transistor.

[0021] In the above scheme, the second startup circuit includes: a first resistor and a first diode;

[0022] The first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the second end of the fourth MOSFET, the first end of the fourth MOSFET is connected to the second end of the control circuit and the shunt circuit, the third end of the fourth MOSFET is connected to the first end of the first diode, and the second end of the first diode is connected to the ground wire.

[0023] When a power surge occurs, a first electrical signal is provided to the first resistor through the power supply. The first resistor transmits the first electrical signal to the second terminal of the fourth MOS transistor. The fourth MOS transistor is turned on under the action of the first electrical signal. The first terminal of the fourth MOS transistor provides a second electrical signal to the control circuit. The voltage of the first electrical signal is greater than the threshold voltage of the fourth MOS transistor.

[0024] In the above scheme, the control circuit includes: a first control circuit and a second control circuit;

[0025] The first terminal of the first control circuit is connected to the power supply, the second terminal of the first control circuit is connected to the second terminal of the start-up circuit, and the third terminal of the first control circuit is connected to the ground wire.

[0026] The first terminal of the second control circuit is connected to the power supply, the second terminal of the second control circuit is connected to the second terminal of the start-up circuit, and the third terminal of the second control circuit is connected to the ground wire.

[0027] When a power surge occurs, the power supply provides the third electrical signal to the first terminal of the first control circuit and the first terminal of the second control circuit. The second terminal of the startup circuit provides the second electrical signal to the second terminal of the first control circuit, the second terminal of the second control circuit and the second terminal of the shunt circuit. The shunt circuit is turned on under the action of the second electrical signal to supply current to the electronic device.

[0028] The pressure difference between the first control circuit and the second control circuit increases under the action of the second electrical signal and the third electrical signal. The first node on the second control circuit sends a first pressure difference signal to the second end of the shunt circuit, and the second node on the second control circuit sends a second pressure difference signal to the second end of the shunt circuit. The shunt circuit is turned on under the action of the first pressure difference signal and the second pressure difference signal.

[0029] In the above scheme, the second control circuit includes: a fifth MOSFET, a sixth MOSFET, and a second diode;

[0030] The first terminal of the fifth MOSFET is connected to the power supply; the second terminal of the fifth MOSFET is connected to the first terminal of the fourth MOSFET; the third terminal of the fifth MOSFET is connected to the first terminal of the sixth MOSFET; the first terminal of the sixth MOSFET is connected to the second terminal of the second MOSFET; the first terminal of the sixth MOSFET is a first node; the second terminal of the sixth MOSFET is connected to the startup circuit; the third terminal of the sixth MOSFET is connected to the second terminal of the third MOSFET and the first terminal of the second diode; the third terminal of the sixth MOSFET is a second node; and the second terminal of the second diode is connected to the ground wire.

[0031] When a power surge occurs, the power supply provides a third electrical signal to the first terminal of the fifth MOSFET, and the first terminal of the fourth MOSFET provides a second electrical signal to the second terminal of the fifth MOSFET. Under the action of the second and third electrical signals, the fifth MOSFET conducts to form a second voltage divider signal and sends the second voltage divider signal to the first terminal of the sixth MOSFET. The first and second terminals of the sixth MOSFET are connected. Under the action of the second voltage divider signal, the sixth MOSFET conducts and sends a first differential voltage signal to the second terminal of the second MOSFET through its first terminal. It also sends a second differential voltage signal to the second terminal of the third MOSFET through its third terminal. Under the action of the first and second differential voltage signals, the second and third MOSFETs conduct, dissipating some current through the ground wire to reduce the current of the electronic device.

[0032] In the above scheme, the startup circuit further includes: a seventh MOS transistor;

[0033] The first terminal of the seventh MOS transistor is connected to the second terminal of the first resistor, the second terminal of the seventh MOS transistor is connected to the second terminal of the sixth MOS transistor, and the third terminal of the seventh MOS transistor is connected to the first terminal of the first diode.

[0034] When a power surge occurs, the second voltage divider signal is divided at the second terminal of the sixth MOSFET to form a third voltage divider signal, which is then sent to the second terminal of the seventh MOSFET. The seventh MOSFET is turned on under the action of the second voltage divider signal, reducing the voltage at the second terminal of the sixth MOSFET. The sixth MOSFET is then turned off, thereby disconnecting the second control circuit and protecting the electronic device.

[0035] In the above scheme, the first control circuit consists of an eighth MOSFET, a ninth MOSFET, and a third diode;

[0036] The first terminal of the eighth MOSFET is connected to the power supply. The second terminal of the eighth MOSFET is connected to the first terminal of the fourth MOSFET and the third terminal of the eighth MOSFET. The third terminal of the eighth MOSFET is connected to the first terminal of the ninth MOSFET. The second terminal of the ninth MOSFET is connected to the second terminal of the sixth MOSFET. The third terminal of the ninth MOSFET is connected to the first terminal of the third diode. The second terminal of the third diode is connected to the ground wire.

[0037] When a power surge occurs, the power supply provides a third electrical signal to the first terminal of the eighth MOSFET, and the first terminal of the fourth MOSFET provides a second electrical signal to the second terminal of the eighth MOSFET. Under the action of the second and third electrical signals, the eighth MOSFET conducts to form a fourth voltage divider signal and sends the fourth voltage divider signal to the first terminal of the ninth MOSFET. Under the action of the fourth voltage divider signal, the ninth MOSFET conducts to form a fifth voltage divider signal and sends the fifth voltage divider signal to the first terminal of the third diode, and consumes the fifth voltage divider signal through the ground wire.

[0038] In the above scheme, the first control circuit further includes: a third resistor and a fourth resistor;

[0039] The first ends of the third resistor and the fourth resistor are connected to the third end of the ninth MOS transistor, the second end of the third resistor is grounded, and the second end of the fourth resistor is connected to the first end of the third diode.

[0040] The third resistor shunts the current flowing through the third diode, and the fourth resistor divides the voltage flowing through the third diode.

[0041] This invention also provides an electronic device, including: an electronic component, and a surge-protected bandgap reference source circuit connected to the electronic component.

[0042] In this embodiment, the first terminal of the startup circuit is connected to the power supply, the second terminal of the startup circuit is connected to the control circuit, and the third terminal of the startup circuit is connected to the ground. The first terminal of the control circuit is connected to the power supply, the control circuit is connected to the second terminal of the startup circuit, and the third terminal of the control circuit is connected to the ground. The first terminal of the shunt circuit is connected to the power supply, the second terminal of the shunt circuit is connected to both the startup circuit and the control circuit, and the third terminal of the shunt circuit is connected to the electronic device and the ground. When a power surge occurs, the power supply provides a first electrical signal to the startup circuit, which conducts under the action of the first electrical signal. The second terminal of the startup circuit provides a second electrical signal to the control circuit. The power supply provides a third electrical signal to the first terminal of the control circuit. Under the action of the second and third electrical signals, the voltage difference of the control circuit increases, and a fourth electrical signal is provided to the second terminal of the shunt circuit. The shunt circuit conducts under the action of the fourth electrical signal, dissipating some current through the ground to reduce the current of the electronic device, thereby effectively protecting the electronic device connected to the gap reference source circuit. Attached Figure Description

[0043] Figure 1 A schematic diagram of the existing surge-protected bandgap reference source circuit structure;

[0044] Figure 2 The graph shows the change in power supply voltage during a surge.

[0045] Figure 3 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 1 ;

[0046] Figure 4 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 2 ;

[0047] Figure 5 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 3 ;

[0048] Figure 6 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 4 ;

[0049] Figure 7 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 5 ;

[0050] Figure 8 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 6 ;

[0051] Figure 9 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 7 ;

[0052] Figure 10 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application Figure 8 ;

[0053] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application are further described in detail below with reference to the accompanying drawings and embodiments. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0056] If the application documents contain similar descriptions such as "first / second", the following explanation shall be added: In the following description, the terms "first / second / third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0057] 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 embodiments of this application only and is not intended to limit this application.

[0058] Please combine Figure 1 This is a schematic diagram of the existing surge protection bandgap reference source circuit structure.

[0059] like Figure 1 The diagram shows a traditional current-source bandgap reference circuit. The core of the bandgap reference consists of diodes A2 and A3, resistors B2, B3, and B4, and MOSFETs T3, T4, T5, and T6. The core of the current-source bandgap reference generates a reference current that is weakly correlated with temperature, process parameters, and power supply voltage. This reference current is mirrored to generate a reference current or parameter current. T7 generates a mirrored reference current, which is provided to module 1. T8 generates a mirrored current, which, after passing through resistor B5, generates a reference voltage, which is provided to module 2. Diode A1, MOSFETs T1 and T2, and resistor B1 form a startup circuit to eliminate the degeneracy point of the bandgap reference and provide a startup current.

[0060] like Figure 2 As shown, when a surge occurs, VAA (power supply) will rise to a very high voltage in a very short time. Due to the large resistance of B1, the rise rate of V1 is less than that of VAA, and the bandgap reference source does not have time to conduct during the rise of VAA. After VAA reaches its maximum value, V1 then increases, and T2 conducts. Because the voltage of VAA is very high, a large current will flow through the branch composed of T5, T2, and A1. At the same time, the reference current and reference voltage will also increase rapidly. The huge current and excessively high voltage may damage modules 1 and 2.

[0061] To address the technical problem that surge-protected bandgap reference source circuits in the prior art damage modules 1 and 2 during surges, this application provides a surge-protected bandgap reference source circuit. Please refer to... Figure 3 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 1 .

[0062] The surge protection bandgap reference source circuit provided in this embodiment of the invention is connected to electronic devices. The surge protection bandgap reference source circuit includes: a power supply 1, a startup circuit 100, a control circuit 200, and a shunt circuit 300.

[0063] The first terminal of the starting circuit 100 is connected to the power supply 1, the second terminal of the starting circuit 100 is connected to the control circuit 200, and the third terminal of the starting circuit 100 is connected to the ground wire 400.

[0064] The first terminal of the control circuit 200 is connected to the power supply 1, the second terminal of the control circuit 200 is connected to the starting circuit 100, and the third terminal of the control circuit 200 is connected to the ground wire 400.

[0065] The first end of the shunt circuit 300 is connected to the power supply 1, the second end of the shunt circuit 300 is connected to the start-up circuit 100 and the control circuit 200, and the third end of the shunt circuit 300 is connected to the electronic device 500 and the ground wire 400 respectively.

[0066] When a surge occurs in power supply 1, a first electrical signal is provided to the startup circuit 100 through power supply 1. The startup circuit 100 is turned on under the action of the first electrical signal, and the second terminal of the startup circuit 100 provides a second electrical signal to the control circuit 200.

[0067] Power supply 1 provides a third electrical signal to the first terminal of control circuit 200. Under the action of the second and third electrical signals, the voltage difference of control circuit 200 increases and provides a fourth electrical signal to the second terminal of shunt circuit 300. Under the action of the fourth electrical signal, shunt circuit 300 is turned on, and part of the current is consumed through ground wire 400 to reduce the current of electronic device 500.

[0068] In this embodiment of the invention, when a surge occurs, the voltage difference in the control circuit 200 rapidly increases under the influence of the third and second electrical signals. As the voltage difference in the control circuit 200 increases, the shunt circuit 300 connected to the control circuit 200 is activated, causing a portion of the current in the shunt circuit 300 to be consumed by the ground wire. This reduces the current in the electronic device 500, effectively protecting the electronic device 500 connected to the gap reference source circuit.

[0069] Please see Figure 4 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 2 .

[0070] In this embodiment of the invention, the shunt circuit 300 includes: a first MOS transistor M7 and a differential voltage shunt circuit 301.

[0071] The first terminal of the first MOSFET M7 is connected to the power supply 1, the second terminal of the first MOSFET M7 is connected to the startup circuit 200, and the third terminal of the first MOSFET M7 is connected to the first terminal of the differential voltage shunt circuit 301 and the electronic device 500, respectively.

[0072] The second terminal of the differential pressure shunt circuit 301 is connected to the control circuit 200, and the third terminal of the differential pressure shunt circuit 301 is connected to the ground wire 400.

[0073] When a power surge occurs, the control circuit 200 provides a fifth electrical signal to the second terminal of the differential voltage shunt circuit 301 under the action of the second and third electrical signals. The differential voltage shunt circuit 301 is turned on under the action of the fifth electrical signal. The first terminal of the first MOSFET M7 is turned on under the action of the sixth electrical signal provided by the power supply 1 and the second terminal of the first MOSFET M7 is turned on by the second electrical signal, forming a large current. The differential voltage shunt circuit 301 consumes part of the current at the third terminal of the first MOSFET M7 through the ground wire 400 to reduce the current of the electronic device 500.

[0074] In this embodiment of the invention, the first MOSFET M7 can be a P-type MOSFET. The source of the first MOSFET M7 is connected to the power supply 1, the gate of the first MOSFET M7 is connected to the startup circuit 100, and the drain of the first MOSFET M7 is connected to the first terminal of the differential voltage shunt circuit 301 and the electronic device 500, respectively.

[0075] Please see Figure 5 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 3 .

[0076] In this embodiment of the invention, the differential voltage shunt circuit 301 includes a second MOSFET M9 and a third MOSFET M8.

[0077] The first terminal of the second MOSFET M9 is connected to the third terminal of the first MOSFET M7. The second terminal of the second MOSFET M9 is connected to the first node of the control circuit 200. The third terminal of the second MOSFET M9 is connected to the first terminal of the third MOSFET M8. The second terminal of the third MOSFET M8 is connected to the second node of the control circuit 200. The third terminal of the third MOSFET M8 is connected to the ground line 400.

[0078] When a power surge occurs, the control circuit 200, under the influence of the second and third electrical signals, sends a first differential voltage signal to the second terminal of the second MOSFET M9 through the first node and a second differential voltage signal to the second terminal of the third MOSFET M8 through the second node. The second and third MOSFETs M9 and M8 conduct under the influence of the first and second differential voltage signals, dissipating some current through the ground wire 400 to reduce the current of the electronic device 400. The first differential voltage signal is greater than the threshold voltage of the second MOSFET M9, and the second differential voltage signal is greater than the threshold voltage of the third MOSFET M8.

[0079] In this embodiment of the invention, the second MOSFET M9 can be an N-type MOSFET. The third MOSFET M8 can be a P-type MOSFET. The drain of the second MOSFET M9 is connected to the drain of the first MOSFET M7, the gate of the second MOSFET M9 is connected to the first node of the control circuit 200, the source of the second MOSFET M9 is connected to the source of the third MOSFET M9, the gate of the third MOSFET M9 is connected to the second node of the control circuit 200, and the drain of the third MOSFET M8 is connected to the ground line 400.

[0080] In this embodiment of the invention, when a surge occurs in power supply 1, the control circuit 200, under the action of the second and third electrical signals, transmits a first differential voltage signal to the gate of the second MOSFET M9 through the first node and a second differential voltage signal to the gate of the third MOSFET M8 through the second node. The second MOSFET M9 and the third MOSFET M8 are turned on under the action of the first and second differential voltage signals, dissipating some current through the ground wire 400 to reduce the current of the electronic device 500. In this embodiment of the invention, the conduction condition of the second MOSFET M9 is that its gate voltage minus its source voltage is greater than the threshold voltage, and the conduction condition of the third MOSFET M8 is that its source voltage minus its gate voltage is greater than the threshold voltage. Furthermore, since the gate voltage of the second MOSFET M9 is the first differential voltage signal and the gate voltage of the third MOSFET M8 is the second differential voltage signal, the source voltages of the second MOSFET M9 and the third MOSFET M8 are the same. The difference between the gate voltage and source voltage of the second MOSFET M9 and the source voltage and gate voltage of the third MOSFET M8 is equivalent to the difference between the first and second differential voltage signals. When the difference between the first and second differential voltage signals is greater than the sum of the threshold voltages of the second and third MOSFETs M9 and M8, the second and third MOSFETs M9 and M8 are turned on.

[0081] Please see Figure 6 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 4 .

[0082] The startup circuit includes: a second startup circuit 101 and a fourth MOSFET M2;

[0083] The first terminal of the second startup circuit 101 is connected to the power supply 1, the second terminal of the fourth MOSFET M2 is connected to the second startup circuit 101, the first terminal of the fourth MOSFET M2 is connected to the second terminal of the control circuit 200 and the shunt circuit 300, the third terminal of the fourth MOSFET M2 is connected to the second startup circuit 101, and the second terminal of the second startup circuit 101 is connected to the ground wire 400.

[0084] When a surge occurs in power supply 1, a first electrical signal is provided to the second startup circuit 101 through power supply 1. The second startup circuit 101 sends the first electrical signal to the second terminal of the fourth MOSFET M2. The fourth MOSFET M2 is turned on under the action of the first electrical signal. The first terminal of the fourth MOSFET M2 provides a second electrical signal to the control circuit 200. The voltage of the first electrical signal is greater than the threshold voltage of the fourth MOSFET M2.

[0085] Please see Figure 7 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 5 .

[0086] In this embodiment of the invention, the startup circuit 100 includes: a first resistor R1, a fourth MOSFET M2, and a first diode D1.

[0087] The first end of the first resistor R1 is connected to the power supply 1, the second end of the first resistor R1 is connected to the second end of the fourth MOSFET M2, the first end of the fourth MOSFET M2 is connected to the second end of the control circuit 200 and the shunt circuit 300, the third end of the fourth MOSFET M2 is connected to the first end of the first diode D1, and the second end of the first diode D1 is connected to the ground wire 400.

[0088] When a surge occurs in power supply 1, a first electrical signal is provided to the first resistor R1 through power supply 1. The first resistor R1 transmits the first electrical signal to the second terminal of the fourth MOSFET M2. The fourth MOSFET M2 is turned on under the action of the first electrical signal. The first terminal of the fourth MOSFET M2 provides a second electrical signal to the control circuit 200. The voltage of the first electrical signal is greater than the threshold voltage of the fourth MOSFET M2.

[0089] In this embodiment of the invention, the fourth MOSFET M2 can be an N-type MOSFET. The second terminal of the first resistor R1 is connected to the gate of the fourth MOSFET M2, the drain of the fourth MOSFET M2 is connected to the control circuit 200 and the gate of the first MOSFET M7, and the source of the fourth MOSFET M2 is connected to the first terminal of the first diode D1. When a surge occurs in power supply 1, a first electrical signal is supplied to the gate of the fourth MOSFET M2, and the fourth MOSFET M2 turns on under the action of the first electrical signal. The drain of the fourth MOSFET M2 provides a second electrical signal to the control circuit 200, and the voltage of the first electrical signal is greater than the threshold voltage of the fourth MOSFET M2.

[0090] Please see Figure 8 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 6 .

[0091] The control circuit includes: a first control circuit 201 and a second control circuit 202.

[0092] The first terminal of the first control circuit 201 is connected to the power supply 1, the second terminal of the first control circuit 201 is connected to the second terminal of the start-up circuit 100, and the third terminal of the first control circuit 201 is connected to the ground wire 400.

[0093] The first terminal of the second control circuit 202 is connected to the power supply 1, the second terminal of the second control circuit 202 is connected to the second terminal of the start-up circuit 100, and the third terminal of the second control circuit 202 is connected to the ground wire 400.

[0094] When a surge occurs in power supply 1, power supply 1 provides a third electrical signal to the first terminal of the first control circuit 201 and the first terminal of the second control circuit 202. The second terminal of the start circuit 100 provides a second electrical signal to the second terminal of the first control circuit 201, the second terminal of the second control circuit 202 and the second terminal of the shunt circuit 300. Under the action of the second electrical signal, the shunt circuit 300 is turned on to supply current to the electronic device 500.

[0095] The pressure difference between the first control circuit 201 and the second control circuit 202 increases under the action of the second electrical signal and the third electrical signal. The first node on the second control circuit 202 sends the first pressure difference signal to the second end of the shunt circuit 300, and the second node on the second control circuit 202 sends the second pressure difference signal to the second end of the shunt circuit 300. The shunt circuit 300 is turned on under the action of the first pressure difference signal and the second pressure difference signal.

[0096] Please see Figure 9 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 7 .

[0097] In this embodiment of the invention, the second control circuit 202 includes: a fifth MOS transistor M6, a sixth MOS transistor M46, and a second diode D3.

[0098] The first terminal of the fifth MOSFET M6 is connected to power supply 1. The second terminal of the fifth MOSFET M6 is connected to the first terminal of the fourth MOSFET M2. The third terminal of the fifth MOSFET M6 is connected to the first terminal of the sixth MOSFET M4. The first terminal of the sixth MOSFET M4 is connected to the second terminal of the second MOSFET M9. The first terminal of the sixth MOSFET M4 is the first node V3. The second terminal of the sixth MOSFET M4 is connected to the startup circuit 100. The third terminal of the sixth MOSFET M6 is connected to the second terminal of the third MOSFET M8 and the first terminal of the second diode. The third terminal of the sixth MOSFET M4 is the second node V4. The second terminal of the second diode is connected to ground 400.

[0099] When a power surge occurs, power supply 1 provides a third electrical signal to the first terminal of the fifth MOSFET M6, and the first terminal of the fourth MOSFET M2 provides a second electrical signal to the second terminal of the fifth MOSFET M6. Under the action of the second and third electrical signals, the fifth MOSFET M6 conducts to form a second voltage divider signal, which is then sent to the first terminal of the sixth MOSFET M4. The first and second terminals of the sixth MOSFET M4 are connected. Under the action of the second voltage divider signal, the sixth MOSFET M4 conducts and sends a first differential voltage signal to the second terminal of the second MOSFET M9 through its first terminal. It also sends a second differential voltage signal to the second terminal of the third MOSFET M8 through its third terminal. The second MOSFET M9 and the third MOSFET M8 conduct under the action of the first and second differential voltage signals, dissipating some current through the ground wire 400 to reduce the current of the electronic device 500.

[0100] In this embodiment of the invention, the fifth MOSFET M6 can be a P-type MOSFET. The sixth MOSFET M4 can be an N-type MOSFET. The source of the fifth MOSFET M6 is connected to power supply 1, the gate of the fifth MOSFET M6 is connected to the drain of the fourth MOSFET M2, the drain of the fifth MOSFET M6 is connected to the drain of the sixth MOSFET M4, the drain of the sixth MOSFET M4 is connected to the gate of the second MOSFET M9, the drain of the sixth MOSFET M4 is at the first node V3, the gate of the sixth MOSFET M4 is connected to the startup circuit 100, the source of the sixth MOSFET M4 is connected to the gate of the third MOSFET M8 and the first terminal of the second diode D3, the source of the sixth MOSFET M4 is at the second node V3, and the second terminal of the second diode D3 is connected to ground.

[0101] Please see Figure 9 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 7 .

[0102] In this embodiment of the invention, the second control circuit 202 further includes a second resistor R4.

[0103] The first end of the second resistor R4 is connected to the third end of the sixth MOSFET M4, and the second end of the second resistor R4 is connected to ground line 400.

[0104] When a surge occurs in power supply 1, the sixth MOSFET M4, under the action of the second voltage divider signal, sends a second differential voltage signal from the third terminal of the sixth MOSFET M4 to the second terminal of the third MOSFET M9. The second differential voltage signal is shunted through the second resistor R4.

[0105] Please see Figure 9 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 7 .

[0106] In this embodiment of the invention, the startup circuit 100 further includes a seventh MOS transistor M1.

[0107] The first terminal of the seventh MOSFET M1 is connected to the second terminal of the first resistor R1, the second terminal of the seventh MOSFET M1 is connected to the second terminal of the sixth MOSFET M4, and the third terminal of the seventh MOSFET M1 is connected to the first terminal of the first diode D1.

[0108] When a power surge occurs, the second voltage divider signal is divided at the second terminal of the sixth MOSFET M4 to form the third voltage divider signal, which is then sent to the second terminal of the seventh MOSFET M1. The seventh MOSFET M1 is turned on under the action of the second voltage divider signal, reducing the voltage at the second terminal of the sixth MOSFET M4. The sixth MOSFET M4 is turned off, thereby disconnecting the second control circuit 202 and protecting the electronic device 500.

[0109] In this embodiment of the invention, the seventh MOS transistor M1 can be a P-type MOS transistor. The drain of the seventh MOS transistor M1 is connected to the second terminal of the first resistor R1, the gate of the seventh MOS transistor M1 is connected to the gate of the sixth MOS transistor M4, and the source of the seventh MOS transistor M1 is connected to the first terminal of the first diode D1.

[0110] Please see Figure 10 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 8 .

[0111] In this embodiment of the invention, the first control circuit 201 consists of an eighth MOS transistor M5, a ninth MOS transistor M3, and a third diode D2.

[0112] The first terminal of the eighth MOSFET M5 is connected to power supply 1. The second terminal of the eighth MOSFET M5 is connected to the first terminal of the fourth MOSFET M2 and the third terminal of the eighth MOSFET M5. The third terminal of the eighth MOSFET M5 is connected to the first terminal of the ninth MOSFET M3. The second terminal of the ninth MOSFET M3 is connected to the second terminal of the sixth MOSFET M4. The third terminal of the ninth MOSFET M3 is connected to the first terminal of the third diode D2. The second terminal of the third diode D2 is connected to ground wire 400.

[0113] When a power surge occurs, power supply 1 provides a third electrical signal to the first terminal of the eighth MOSFET M5, and the first terminal of the fourth MOSFET M2 provides a second electrical signal to the second terminal of the eighth MOSFET M5. Under the action of the second and third electrical signals, the eighth MOSFET M5 conducts to form a fourth voltage divider signal, and sends the fourth voltage divider signal to the first terminal of the ninth MOSFET M3. Under the action of the fourth voltage divider signal, the ninth MOSFET M3 conducts to form a fifth voltage divider signal, sends the fifth voltage divider signal to the first terminal of the third diode D2, and consumes the fifth voltage divider signal through the ground line 400.

[0114] In this embodiment of the invention, the eighth MOSFET M5 can be a P-type MOSFET. The ninth MOSFET M3 can be an N-type MOSFET. The source of the eighth MOSFET M5 is connected to power supply 1. The gate of the eighth MOSFET M5 is connected to the drain of the fourth MOSFET M2 and the drain of the eighth MOSFET M5, respectively. The drain of the eighth MOSFET M5 is connected to the drain of the ninth MOSFET M3. The gate of the ninth MOSFET M3 is connected to the gate of the sixth MOSFET M4. The source of the ninth MOSFET M3 is connected to the first terminal of the third diode D2. The second terminal of the third diode E2 is connected to ground line 400.

[0115] Please see Figure 10 The structure of the surge protection bandgap reference source circuit provided in the embodiments of this application is as follows. Figure 8 .

[0116] In this embodiment of the invention, the first control circuit 201 further includes a third resistor R2 and a fourth resistor R3.

[0117] In this embodiment of the invention, the first ends of the third resistor R2 and the fourth resistor R3 are connected to the third end of the ninth MOS transistor M3, the second end of the third resistor R2 is grounded, and the second end of the fourth resistor R3 is connected to the first end of the third diode D2.

[0118] In this embodiment of the invention, the third resistor R2 shunts the current flowing through the third diode D2, and the fourth resistor R3 is used to divide the voltage flowing through the third diode D2.

[0119] Please see Figure 11This is a schematic diagram of the electronic device 103 provided in an embodiment of this application. The electronic device 103 includes an electronic component 500 and the surge protection bandgap reference source circuit 102 in the above embodiment.

[0120] In this embodiment, the first terminal of the start-up circuit 100 in the surge protection bandgap reference source circuit 102 is connected to the power supply 1, the second terminal of the start-up circuit 100 is connected to the control circuit 200, and the third terminal of the start-up circuit 100 is connected to the ground wire 400; the first terminal of the control circuit 200 is connected to the power supply 1, the control circuit 200 is connected to the second terminal of the start-up circuit 100, and the third terminal of the control circuit 200 is connected to the ground wire 400; the first terminal of the shunt circuit 300 is connected to the power supply 1, the second terminal of the shunt circuit 300 is connected to the start-up circuit 100 and the control circuit 200, and the third terminal of the shunt circuit 300 is connected to the electronic device 500 and the ground wire 400 respectively; when the power... When a surge occurs in source 1, a first electrical signal is provided to the startup circuit 100 through power supply 1. The startup circuit 100 is turned on under the action of the first electrical signal. The second terminal of the startup circuit 100 provides a second electrical signal to the control circuit 200. Power supply 1 provides a third electrical signal to the first terminal of the control circuit 200. Under the action of the second and third electrical signals, the voltage difference of the control circuit 200 increases and provides a fourth electrical signal to the second terminal of the shunt circuit 300. The shunt circuit 300 is turned on under the action of the fourth electrical signal, and part of the current is consumed through the ground wire 400 to reduce the current of the electronic device 500, thereby effectively protecting the electronic device 500 connected to the gap reference source circuit 102.

[0121] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A surge prevention bandgap reference source circuit, characterized by, The anti-surge bandgap reference source circuit is connected with an electronic device, and comprises a power supply, a starting circuit, a control circuit and a shunt circuit; a first end of the starting circuit is connected with the power supply, a second end of the starting circuit is connected with the control circuit, and a third end of the starting circuit is connected with a ground wire; a first end of the control circuit is connected with the power supply, the control circuit is connected with the second end of the starting circuit, and a third end of the control circuit is connected with the ground wire; a first end of the shunt circuit is connected with the power supply, a second end of the shunt circuit is connected with the starting circuit and the control circuit, and a third end of the shunt circuit is connected with the electronic device and the ground wire respectively; when a surge occurs in the power supply, a first electric signal is provided to the starting circuit through the power supply, the starting circuit is turned on under the action of the first electric signal, and a second electric signal is provided to the control circuit from the second end of the starting circuit; the power supply provides a third electric signal to the first end of the control circuit, the control circuit is raised in differential pressure under the action of the second electric signal and the third electric signal, and a fourth electric signal is provided to the second end of the shunt circuit, the shunt circuit is turned on under the action of the fourth electric signal, and part of the current is consumed through the ground wire to reduce the current of the electronic device; wherein the differential pressure represents the difference of voltage.

2. The surge prevention bandgap reference source circuit of claim 1, wherein, The shunt circuit comprises a first MOS tube and a differential pressure shunt circuit; a first end of the first MOS tube is connected with the power supply, a second end of the first MOS tube is connected with the starting circuit, and a third end of the first MOS tube is connected with the first end of the differential pressure shunt circuit and the electronic device respectively; a second end of the differential pressure shunt circuit is connected with the control circuit, and a third end of the differential pressure shunt circuit is connected with the ground wire; when a surge occurs in the power supply, the control circuit provides a fifth electric signal to the second end of the differential pressure shunt circuit under the action of the second electric signal and the third electric signal, the differential pressure shunt circuit is turned on under the action of the fifth electric signal, the first end of the first MOS tube is turned on under the action of the sixth electric signal provided by the power supply and the second end of the first MOS tube, a large amount of current is formed, and part of the current of the third end of the first MOS tube is consumed through the ground wire by the differential pressure shunt circuit to reduce the current of the electronic device.

3. The surge prevention bandgap reference source circuit of claim 2, wherein, The differential pressure shunt circuit comprises a second MOS tube and a third MOS tube; a first end of the second MOS tube is connected with the third end of the first MOS tube, a second end of the second MOS tube is connected with a first node of the control circuit, a third end of the second MOS tube is connected with a first end of the third MOS tube, a second end of the third MOS tube is connected with a second node of the control circuit, and a third end of the third MOS tube is connected with the ground wire; When the power supply has a surge, the control circuit transports a first voltage difference signal to the second end of the second MOS tube through the first node and a second voltage difference signal to the second end of the third MOS tube through the second node under the action of the second electric signal and the third electric signal, the second MOS tube and the third MOS tube are turned on under the action of the first voltage difference signal and the second voltage difference signal, and part of the current is consumed through the ground wire to reduce the current of the electronic device; the first voltage difference signal voltage is greater than the threshold voltage of the second MOS tube, and the second voltage difference signal voltage is greater than the threshold voltage of the third MOS tube.

4. The surge prevention bandgap reference source circuit of claim 1, wherein, The starting circuit comprises a second starting circuit and a fourth MOS tube. The first end of the second starting circuit is connected with the power supply, the second end of the second starting circuit is connected with the ground wire, the second end of the fourth MOS tube is connected with the second starting circuit, the first end of the fourth MOS tube is connected with the control circuit and the second end of the shunt circuit, and the third end of the fourth MOS tube is connected with the second starting circuit. When the power supply has a surge, the second starting circuit transports a first electric signal to the second end of the fourth MOS tube, and the fourth MOS tube is turned on under the action of the first electric signal, the first end of the fourth MOS tube provides a second electric signal to the control circuit, and the first electric signal voltage is greater than the threshold voltage of the fourth MOS tube.

5. The surge prevention bandgap reference source circuit of claim 4, wherein, The second starting circuit comprises a first resistor and a first diode. The first end of the first resistor is connected with the power supply, the second end of the first resistor is connected with the second end of the fourth MOS tube, the first end of the fourth MOS tube is connected with the control circuit and the second end of the shunt circuit, the third end of the fourth MOS tube is connected with the first end of the first diode, and the second end of the first diode is connected with the ground wire. When the power supply has a surge, the first resistor transports a first electric signal to the second end of the fourth MOS tube, and the fourth MOS tube is turned on under the action of the first electric signal, the first end of the fourth MOS tube provides a second electric signal to the control circuit, and the first electric signal voltage is greater than the threshold voltage of the fourth MOS tube.

6. The surge prevention bandgap reference source circuit of claim 1, wherein, The control circuit comprises a first control circuit and a second control circuit. The second control circuit comprises a first node and a second node connected with the shunt circuit. The first end of the first control circuit is connected with the power supply, the second end of the first control circuit is connected with the second end of the starting circuit, and the third end of the first control circuit is connected with the ground wire. The first end of the second control circuit is connected with the power supply, the second end of the second control circuit is connected with the second end of the starting circuit, and the third end of the second control circuit is connected with the ground wire. When the power supply has a surge, the power supply provides the third electrical signal to the first end of the first control circuit and the second control circuit, the second end of the starting circuit provides the second electrical signal to the second end of the first control circuit, the second end of the second control circuit and the second end of the shunt circuit, and the shunt circuit conducts under the action of the second electrical signal to deliver current to the electronic device; The first control circuit and the second control circuit increase the differential pressure under the action of the second electrical signal and the third electrical signal, the first node on the second control circuit delivers a first differential pressure signal to the second end of the shunt circuit, the second node on the second control circuit delivers a second differential pressure signal to the second end of the shunt circuit, and the shunt circuit conducts under the action of the first differential pressure signal and the second differential pressure signal.

7. The surge prevention bandgap reference source circuit of claim 6, wherein, The second control circuit further comprises a fifth MOS tube, a sixth MOS tube and a second diode; The first end of the fifth MOS tube is connected to the power supply, the second end of the fifth MOS tube is connected to the first end of the fourth MOS tube, the third end of the fifth MOS tube is connected to the first end of the sixth MOS tube, the first end of the sixth MOS tube is connected to the second end of the second MOS tube, the first end of the sixth MOS tube is the first node, the second end of the sixth MOS tube is connected to the starting circuit, the third end of the sixth MOS tube is connected to the second end of the third MOS tube and the first end of the second diode respectively, the third end of the sixth MOS tube is the second node, and the second end of the second diode is connected to the ground wire. When the power supply has a surge, the power supply provides the third electrical signal to the first end of the fifth MOS tube, the first end of the fourth MOS tube provides the second electrical signal to the second end of the fifth MOS tube, the fifth MOS tube conducts to form a second voltage division signal under the action of the second electrical signal and the third electrical signal, and delivers the second voltage division signal to the first end of the sixth MOS tube, the first end of the sixth MOS tube and the second end of the sixth MOS tube are connected, the sixth MOS tube conducts under the action of the second voltage division signal, and delivers the first differential pressure signal to the second end of the second MOS tube through the first end of the sixth MOS tube, and delivers the second differential pressure signal to the second end of the third MOS tube through the third end of the sixth MOS tube, the second MOS tube and the third MOS tube conduct under the action of the first differential pressure signal and the second differential pressure signal, and part of the current is consumed through the ground wire to reduce the current of the electronic device.

8. The surge prevention bandgap reference source circuit of claim 7, wherein, The starting circuit further comprises a seventh MOS tube; The first end of the seventh MOS tube is connected to the second end of the first resistor, the second end of the seventh MOS tube is connected to the second end of the sixth MOS tube, and the third end of the seventh MOS tube is connected to the first end of the first diode. When the power supply has a surge, the second voltage division signal is divided at the second end of the sixth MOS tube to form a third voltage division signal, which is transmitted to the second end of the seventh MOS tube. The seventh MOS tube is turned on under the action of the second voltage division signal, and the voltage at the second end of the sixth MOS tube is reduced. The sixth MOS tube is turned off, the second control circuit is turned off, and the electronic device is protected.

9. The surge prevention bandgap reference source circuit of claim 7, wherein, The first control circuit further comprises an eighth MOS tube, a ninth MOS tube and a third diode. The first end of the eighth MOS tube is connected to the power supply, the second end of the eighth MOS tube is connected to the first end of the fourth MOS tube and the third end of the eighth MOS tube respectively, the third end of the eighth MOS tube is connected to the first end of the ninth MOS tube, the second end of the ninth MOS tube is connected to the second end of the sixth MOS tube, the third end of the ninth MOS tube is connected to the first end of the third diode, and the second end of the third diode is connected to the ground wire. When the power supply has a surge, the power supply provides a third electric signal to the first end of the eighth MOS tube, the first end of the fourth MOS tube provides the second electric signal to the second end of the eighth MOS tube, the eighth MOS tube is turned on to form a fourth voltage division signal under the action of the second electric signal and the third electric signal, and the fourth voltage division signal is transmitted to the first end of the ninth MOS tube. The ninth MOS tube is turned on to form a fifth voltage division signal under the action of the fourth voltage division signal, the fifth voltage division signal is transmitted to the first end of the third diode, and the fifth voltage division signal is consumed through the ground wire.

10. The surge prevention bandgap reference source circuit of claim 9, wherein, The first control circuit further comprises a third resistor and a fourth resistor. The first ends of the third resistor and the fourth resistor are connected to the third end of the ninth MOS tube, the second end of the third resistor is grounded, and the second end of the fourth resistor is connected to the first end of the third diode. The third resistor is used to shunt the current flowing through the third diode, and the fourth resistor is used to divide the voltage flowing through the third diode.

11. An electronic device, comprising: It comprises: An electronic device and a surge protection bandgap reference source circuit as claimed in any one of claims 1-10 connected to the electronic device.

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