Voltage regulating circuit

Abstract

The invention provides a voltage regulating circuit. The voltage regulating circuit comprises a first current copying unit, a second current copying unit, a third current copying unit and an output unit, the power supply end of the first current copying unit is connected with a preset power supply, the first output end is connected with the input end of the second current copying unit, the second output end is connected with the input end of the third current copying unit, and the third output end is connected with the upper threshold voltage output end to output upper threshold voltage; the output end of the second current copying unit is connected with the input end of the first current copying unit, the power supply end is connected with the first output end of the third current copying unit, and the power supply end is further connected with the adjusting voltage input end to obtain input adjusting voltage; a power supply end of the third current copying unit is grounded, and a second output end is connected with a lower threshold voltage output end to output a lower threshold voltage; and the output unit is connected between the upper threshold voltage output end and the lower threshold voltage output end and is also connected with the reference voltage input end so as to obtain the input reference voltage.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to a voltage regulating circuit. Background Art

[0002] Voltage regulators are an indispensable component of electronic devices. Their primary function is to ensure stable output voltage and meet the power supply accuracy and stability requirements of electronic devices. With the continuous advancement of electronic technology, voltage regulators are facing increasingly stringent requirements in terms of performance, size, and power consumption. Currently, some transformers have high power consumption, relatively simple voltage ranges, and complex circuits. For example, linear regulators have low efficiency, high power consumption, and limited output current, making them difficult to meet the needs of high-power devices. Summary of the Invention

[0003] The purpose of the present invention is to provide a voltage regulation circuit to address the deficiencies in the above-mentioned prior art, so as to achieve precise regulation of the input regulation voltage through the regulation of the input current by the first current replication unit, the second current replication unit and the third current replication unit and the voltage division of the output unit, thereby obtaining the upper threshold voltage and the lower threshold voltage to meet the power supply requirements of different devices.

[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows: In a first aspect, an embodiment of the present application provides a voltage regulation circuit, the voltage regulation circuit comprising: a first current replication unit, a second current replication unit, a third current replication unit, and an output unit; A power supply terminal of the first current replication unit is connected to a preset power supply, a first output terminal of the first current replication unit is connected to an input terminal of the second current replication unit, a second output terminal of the first current replication unit is connected to an input terminal of the third current replication unit, and a third output terminal of the first current replication unit is connected to an upper threshold voltage output terminal to output an upper threshold voltage; The output end of the second current replication unit is connected to the input end of the first current replication unit, the power end of the second current replication unit is connected to the first output end of the third current replication unit, and the power end of the second current replication unit is further connected to the regulated voltage input end to obtain the input regulated voltage; The power supply end of the third current replication unit is grounded, and the second output end of the third current replication unit is connected to the lower threshold voltage output end to output the lower threshold voltage; the output unit is connected between the upper threshold voltage output end and the lower threshold voltage output end, and the output unit is also connected to the reference voltage input end to obtain the input reference voltage.

[0005] In an optional embodiment, the first current copy unit includes: a first current mirror and a second current mirror; The first current mirror and the second current mirror have the same input end, the first output end and the second output end of the first current mirror are respectively the first output end and the second output end of the first current replication unit, and the output end of the second current mirror is the third output end of the first current replication unit.

[0006] In an optional embodiment, the first current copy unit further includes: a first resistor, a second resistor, and a third resistor; the first current mirror includes: a first switch tube, a second switch tube, a third switch tube, and a fifth switch tube; The base of the third switching tube is connected to the emitter of the fifth switching tube, the base of the fifth switching tube is connected to the collector of the third switching tube, the collector of the third switching tube is the input end of the first current mirror, and the collector of the fifth switching tube is grounded; The base of the third switching tube is further connected to the base of the first switching tube and the base of the second switching tube, and the emitter of the first switching tube, the emitter of the second switching tube and the emitter of the third switching tube are connected to the preset power supply through the first resistor, the second resistor and the third resistor respectively; The collector of the first switching tube and the collector of the second switching tube are respectively the first output end and the second output end of the first current mirror.

[0007] In an optional embodiment, the first current copy unit further includes: a fourth resistor; the second current mirror includes: the third switch tube, the fifth switch tube and the fourth switch tube; The base of the fourth switching tube is also connected to the base of the third switching tube, the emitter of the fourth switching tube is also connected to the preset power supply through the fourth resistor, and the collector of the fourth switching tube is the output end of the second current mirror, which is used to connect to the upper threshold voltage output end.

[0008] In an optional embodiment, the second current copy unit includes: a third current mirror; An input end of the third current mirror is an input end of the second current copy unit, and an output end of the third current mirror is an output end of the second current copy unit.

[0009] In an optional embodiment, the second current copy unit further includes: a fifth resistor, and the third current mirror includes: a sixth switch tube, a seventh switch tube, and an eighth switch tube; The base of the sixth switching tube is connected to the collector of the seventh switching tube, the emitter of the sixth switching tube is connected to the base of the seventh switching tube, the collector of the sixth switching tube is connected to a preset power supply, the emitter of the seventh switching tube is the power supply terminal of the third current mirror, and the collector of the seventh switching tube is the input terminal of the third current mirror; The base of the seventh switching tube is also connected to the base of the eighth switching tube, the collector of the eighth switching tube is the output end of the third current mirror, and the emitter of the eighth switching tube is grounded through the fifth resistor.

[0010] In an optional embodiment, the third current copy unit includes: a fourth current mirror and a fifth current mirror; The fourth current mirror and the fifth current mirror have the same input terminal, the output terminal of the fourth current mirror is the first output terminal of the third current replication unit, and the output terminal of the fifth current mirror is the second output terminal of the third current replication unit.

[0011] In an optional implementation, the fourth current mirror includes: a ninth switch tube, a tenth switch tube, and an eleventh switch tube; The base of the tenth switching tube is connected to the collector of the eleventh switching tube, the base of the eleventh switching tube is connected to the emitter of the tenth switching tube, the collector of the eleventh switching tube is the input end of the fourth current mirror, the emitter of the eleventh switching tube is grounded, and the collector of the tenth switching tube is connected to a preset power supply; The base of the eleventh switching tube is also connected to the base of the ninth switching tube, the collector of the ninth switching tube is the output end of the fourth current mirror, and the emitter of the ninth switching tube is grounded.

[0012] In an optional implementation, the fifth current mirror includes: the tenth switching tube, the eleventh switching tube, and a twelfth switching tube; The base of the twelfth switch tube is also connected to the base of the eleventh switch tube, the emitter of the twelfth switch tube is grounded, and the collector of the twelfth switch tube is the output end of the fifth current mirror, which is used to connect to the lower threshold voltage output end.

[0013] In an optional embodiment, the output unit includes: a first voltage regulating resistor and a second voltage regulating resistor, the first voltage regulating resistor and the second voltage regulating resistor are connected in series between the upper threshold voltage output terminal and the lower threshold voltage output terminal, and the series connection point of the first voltage regulating resistor and the second voltage regulating resistor is connected to the reference voltage input terminal.

[0014] The beneficial effects of this application are: An embodiment of the present application provides a voltage regulation circuit, comprising: a first current replication unit, a second current replication unit, a third current replication unit and an output unit; the power supply end of the first current replication unit is connected to a preset power supply, the first output end of the first current replication unit is connected to the input end of the second current replication unit, the second output end of the first current replication unit is connected to the input end of the third current replication unit, and the third output end of the first current replication unit is connected to an upper threshold voltage output end to output an upper threshold voltage; the output end of the second current replication unit is connected to the input end of the first current replication unit, the power supply end of the second current replication unit is connected to the first output end of the third current replication unit, and the power supply end of the second current replication unit is also connected to a regulation voltage input end to obtain an input regulation voltage; the power supply end of the third current replication unit is grounded, and the second output end of the third current replication unit is connected to a lower threshold voltage output end to output a lower threshold voltage; the output unit is connected between the upper threshold voltage output end and the lower threshold voltage output end, and the output unit is also connected to a reference voltage input end to obtain an input reference voltage. By adjusting the input current by the first current replication unit, the second current replication unit and the third current replication unit and dividing the voltage of the output unit, precise adjustment of the input regulation voltage is achieved to obtain the upper threshold voltage and the lower threshold voltage to meet the power supply requirements of different devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of a voltage regulation circuit provided in an embodiment of the present application; Figure 2 A schematic diagram of another voltage regulation circuit provided in an embodiment of the present application; Figure 3 A schematic diagram of another voltage regulation circuit provided in an embodiment of the present application; Figure 4 A schematic diagram of another voltage regulation circuit provided in an embodiment of the present application; Figure 5 A graph showing different input regulation voltages and currents flowing through a fifth resistor according to an embodiment of the present application; Figure 6 A graph showing different input regulation voltages and upper threshold voltages provided in an embodiment of the present application; Figure 7A graph showing different input regulation voltages and lower threshold voltages provided in an embodiment of the present application; Figure 8 A graph showing different temperatures, upper threshold voltage, and lower threshold voltage is provided in an embodiment of the present application.

[0017] Explanation of main component symbols: 110-first current replication unit; 120-second current replication unit; 130-third current replication unit; 140-output unit; 111-first current mirror; 112-second current mirror; 121-third current mirror; 131-fourth current mirror; 132-fifth current mirror; Q1-first switch tube; Q2-second switch tube; Q3-third switch tube; Q4-fourth switch tube; Q5-fifth switch tube; Q6-sixth switch tube; Q7-seventh switch tube; Q8-eighth switch tube; Q9-ninth switch tube; Q10-tenth switch tube; Q11-eleventh switch tube; Q12-twelfth switch tube; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-first voltage regulating resistor; R7-second voltage regulating resistor. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0020] In the description of this application, it should be noted that if the terms "upper", "lower", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0021] In addition, the terms "first," "second," and the like in the description and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0022] It should be noted that, in the absence of conflict, the features in the embodiments of this application can be combined with each other.

[0023] The voltage regulation circuit provided in this application is specifically described below through multiple examples in conjunction with the accompanying drawings.

[0024] Figure 1 A schematic diagram of a voltage regulation circuit provided in an embodiment of the present application; Figure 1 As shown, the voltage regulation circuit includes: a first current replication unit 110 , a second current replication unit 120 , a third current replication unit 130 and an output unit 140 .

[0025] The power supply terminal of the first current replication unit 110 is connected to a preset power supply, the first output terminal of the first current replication unit 110 is connected to the input terminal of the second current replication unit 120, the second output terminal of the first current replication unit 110 is connected to the input terminal of the third current replication unit 130, and the third output terminal of the first current replication unit 110 is connected to the upper threshold voltage output terminal to output the upper threshold voltage.

[0026] The output end of the second current replication unit 120 is connected to the input end of the first current replication unit 110, the power supply end of the second current replication unit 120 is connected to the first output end of the third current replication unit 130, and the power supply end of the second current replication unit 120 is also connected to the adjustment voltage input end to obtain the input adjustment voltage.

[0027] The power supply terminal of the third current replication unit 130 is grounded, and the second output terminal of the third current replication unit 130 is connected to the lower threshold voltage output terminal to output the lower threshold voltage; the output unit 140 is connected between the upper threshold voltage output terminal and the lower threshold voltage output terminal, and the output unit 140 is also connected to the reference voltage input terminal to obtain the input reference voltage.

[0028] In this embodiment, the power supply terminal of the second current replication unit 120 is connected to the adjustment voltage input terminal (WINDOWADJUST) to obtain the input adjustment voltage. The second current replication unit 120 acts as a bias and temperature compensation to provide a low level of current to the input terminal of the first current replication unit 110, thereby improving the stability of the voltage regulation circuit.

[0029] The first current replicating unit 110 replicates the current inputted to the input terminal and then outputs the current to the second current replicating unit 120 through the first output terminal. At this time, the second current replicating unit 120 functions as a feedback, outputting the current to the third current replicating unit 130 through the second output terminal. The second output terminal of the third current replicating unit 130 is connected to the lower threshold voltage output terminal (UV THRESH) to output the lower threshold voltage, and is connected to the upper threshold voltage output terminal (OV THRESH) through the third output terminal to output the upper threshold voltage.

[0030] The output unit 140 serves as a voltage divider, and is configured to obtain a reference voltage, divide the voltage, and then output an upper threshold voltage and a lower threshold voltage from an upper threshold voltage output terminal and a lower threshold voltage output terminal, respectively.

[0031] Optionally, the output unit 140 includes: a first voltage regulating resistor R6 and a second voltage regulating resistor R7, the first voltage regulating resistor R6 and the second voltage regulating resistor R7 are connected in series between the upper threshold voltage output terminal and the lower threshold voltage output terminal, and the series connection point of the first voltage regulating resistor R6 and the second voltage regulating resistor R7 is connected to the reference voltage input terminal.

[0032] The first voltage regulating resistor R6 and the second voltage regulating resistor R7 act as a voltage divider, pulling up and pulling down the reference voltage inputted by the reference voltage input terminal Vref, and then outputting the upper threshold voltage and the lower threshold voltage from the upper threshold voltage output terminal and the lower threshold voltage output terminal respectively. The upper threshold voltage output terminal and the lower threshold voltage output terminal can be connected to different devices, and different threshold voltages can be provided to different devices.

[0033] In summary, an embodiment of the present application provides a voltage regulation circuit, comprising: a first current replication unit, a second current replication unit, a third current replication unit and an output unit; the power supply end of the first current replication unit is connected to a preset power supply, the first output end of the first current replication unit is connected to the input end of the second current replication unit, the second output end of the first current replication unit is connected to the input end of the third current replication unit, and the third output end of the first current replication unit is connected to an upper threshold voltage output end to output an upper threshold voltage; the output end of the second current replication unit is connected to the input end of the first current replication unit, the power supply end of the second current replication unit is connected to the first output end of the third current replication unit, and the power supply end of the second current replication unit is also connected to a regulation voltage input end to obtain an input regulation voltage; the power supply end of the third current replication unit is grounded, and the second output end of the third current replication unit is connected to a lower threshold voltage output end to output a lower threshold voltage; the output unit is connected between the upper threshold voltage output end and the lower threshold voltage output end, and the output unit is also connected to a reference voltage input end to obtain an input reference voltage. By adjusting the input current by the first current replication unit, the second current replication unit and the third current replication unit and dividing the voltage of the output unit, precise adjustment of the input regulation voltage is achieved to obtain the upper threshold voltage and the lower threshold voltage to meet the power supply requirements of different devices.

[0034] Figure 2 A schematic diagram of another voltage regulation circuit provided in an embodiment of the present application is shown as follows: Figure 2 As shown, the first current copy unit 110 includes a first current mirror 111 and a second current mirror 112 .

[0035] The first current mirror 111 and the second current mirror 112 have the same input terminal. The first output terminal and the second output terminal of the first current mirror 111 are respectively the first output terminal and the second output terminal of the first current replication unit 110. The output terminal of the second current mirror 112 is the third output terminal of the first current replication unit 110.

[0036] In this embodiment, the primary function of the first current mirror 111 and the second current mirror 112 is to replicate or "mirror" the input current, generating a current at the output terminal that is identical to or proportional to the input current. The first output terminal of the first current mirror 111 is used to output current to the second current replicating unit 120, and the second output terminal is used to output current to the third current replicating unit 130. The output terminal of the second current mirror 112 is connected to the upper threshold voltage output terminal to output the upper threshold voltage.

[0037] Optionally, the first current copy unit 110 further includes: a first resistor R1, a second resistor R2 and a third resistor R3; the first current mirror 111 includes: a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fifth switch tube Q5.

[0038] The base of the third switch tube Q3 is connected to the emitter of the fifth switch tube Q5 , the base of the fifth switch tube Q5 is connected to the collector of the third switch tube Q3 , the collector of the third switch tube Q3 is the input end of the first current mirror 111 , and the collector of the fifth switch tube Q5 is grounded.

[0039] The base of the third switching tube Q3 is also connected to the base of the first switching tube Q1 and the base of the second switching tube Q2. The emitters of the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are connected to a preset power supply through the first resistor R1, the second resistor R2 and the third resistor R3 respectively.

[0040] The collector of the first switching tube Q1 and the collector of the second switching tube Q2 are respectively the first output end and the second output end of the first current mirror 111 .

[0041] Continue to refer Figure 2 The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fifth switch tube Q5 are all PNP-type transistors. The first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fifth switch tube Q5 form a current source with an emitter follower. The collector of the third switch tube Q3 serves as the input end of the first current mirror 111. The base and emitter of the fifth switch tube Q5 are respectively connected to the collector and base of the third switch tube Q3. By adding the fifth switch tube Q5, the current flowing through the base of the third switch tube Q3 is reduced.

[0042] The collector of the first switch tube Q1 is the first output end, the collector of the second switch tube Q2 is the second output end, and the output current ratio is determined by the resistance values ​​of the first resistor R1, the second resistor R2 and the third resistor R3.

[0043] Specifically, the current flowing through the collector of the first switch tube Q1, that is, the current output by the first output terminal, is: ,in, It is represented by the current flowing through the collector of the first switch tube Q1, It is represented by the resistance value of the third resistor R3, It is represented by the resistance value of the first resistor R1, It is represented by the current flowing through the collector of the third switching tube Q3.

[0044] The current flowing through the collector of the second switch tube Q2, that is, the current output by the second output terminal, is: ,in, It is represented by the current flowing through the collector of the second switch tube Q2. It is represented by the resistance value of the third resistor R3, It is represented by the resistance value of the second resistor R2, It is represented by the current flowing through the collector of the third switching tube Q3.

[0045] Optionally, the first current copy unit 110 further includes a fourth resistor R4 ; the second current mirror 112 includes a third switch tube Q3 , a fifth switch tube Q5 , and a fourth switch tube Q4 .

[0046] The base of the fourth switch tube Q4 is also connected to the base of the third switch tube Q3, and the emitter of the fourth switch tube Q4 is also connected to the preset power supply through the fourth resistor R4. The collector of the fourth switch tube Q4 is the output end of the second current mirror 112, which is used to connect to the upper threshold voltage output end.

[0047] Continue to refer Figure 2 The fourth switch tube Q4 is a PNP transistor. Since the first current mirror 111 and the second current mirror 112 have the same input terminal, the collector of the third switch tube Q3 is also the input terminal of the second current mirror 112, and the collector of the fourth switch tube Q4 is the output terminal of the second current mirror 112. The output current ratio is determined by the resistance values ​​of the third resistor R3 and the fourth resistor R4.

[0048] Specifically, the current flowing through the collector of the fourth switch tube Q4, that is, the current output by the output end of the second current mirror 112, is: ,in, It is represented by the current flowing through the collector of the fourth switch tube Q4, It is represented by the resistance value of the third resistor R3, It is represented by the resistance value of the fourth resistor R4, It is represented by the current flowing through the collector of the third switching tube Q3.

[0049] Since the collector of the fourth switch tube Q4 is also connected to the upper threshold voltage output terminal, the upper threshold voltage outputted by the upper threshold voltage output terminal is: ,in, Expressed as the upper threshold voltage, It is represented by the resistance value of the first voltage regulating resistor R6, Indicates the reference voltage.

[0050] Figure 3 A schematic diagram of another voltage regulation circuit provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the second current copy unit 120 includes a third current mirror 121 .

[0051] An input end of the third current mirror 121 is an input end of the second current copy unit 120 , and an output end of the third current mirror 121 is an output end of the second current copy unit 120 .

[0052] In this embodiment, the third current mirror 121 also primarily functions to replicate or “mirror” the input current to generate a current at the output that is identical to or proportional to the input current. The output of the third current mirror 121 is used to output current to the first current replica unit 110 .

[0053] Optionally, the second current copy unit 120 further includes a fifth resistor R5 , and the third current mirror 121 includes a sixth switch tube Q6 , a seventh switch tube Q7 , and an eighth switch tube Q8 .

[0054] The base of the sixth switch tube Q6 is connected to the collector of the seventh switch tube Q7, the emitter of the sixth switch tube Q6 is connected to the base of the seventh switch tube Q7, the collector of the sixth switch tube Q6 is connected to a preset power supply, the emitter of the seventh switch tube Q7 is the power supply terminal of the third current mirror 121, and the collector of the seventh switch tube Q7 is the input terminal of the third current mirror 121.

[0055] The base of the seventh switch tube Q7 is also connected to the base of the eighth switch tube Q8 . The collector of the eighth switch tube Q8 is the output end of the third current mirror 121 . The emitter of the eighth switch tube Q8 is grounded via the fifth resistor R5 .

[0056] Continue to refer Figure 3 The sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 are all NPN transistors. The sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 form a current source with an emitter follower. The collector of the seventh switch tube Q7 serves as the input end of the third current mirror 121. The base and emitter of the sixth switch tube Q6 are respectively connected to the collector and base of the seventh switch tube Q7. By adding the sixth switch tube Q6, the current flowing through the base of the seventh switch tube Q7 is reduced.

[0057] The collector of the eighth switch tube Q8 is the output end of the third current mirror 121, which reduces the emitter resistance of the seventh switch tube Q7 to zero, so that the static current flowing through the collector of the eighth switch tube Q8 is very small, thereby causing the current flowing through the fifth resistor R5 to be also very small. Therefore, the current flowing through the fifth resistor R5 is Approximately equal to the current flowing through the collector of the third switch tube Q3 , which can be expressed as: .

[0058] Since the emitter voltage of the seventh switch tube Q7 is the same as the emitter voltage of the eighth switch tube Q8, the emitter voltage of the seventh switch tube Q7 is the received regulated voltage, and the emitter voltage of the eighth switch tube Q8 is also the regulated voltage, the current flowing through the fifth resistor R5 is It can also be expressed as: ,in, It is represented by the resistance value of the fifth resistor R5, Indicates the regulated voltage input to the regulated voltage input terminal.

[0059] That is to say, the current flowing through the collector of the third switch tube Q3 is , which can be expressed as: .

[0060] In addition, the input end of the third current mirror 121 is connected to the first output end of the first current mirror 111, and the output end of the third current mirror 121 is connected to the input end of the first current mirror 111. The third current mirror 121 plays a feedback role, making the current input to the first current mirror 111 more stable.

[0061] Figure 4 A schematic diagram of another voltage regulation circuit provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the third current copy unit 130 includes a fourth current mirror 131 and a fifth current mirror 132 .

[0062] The fourth current mirror 131 and the fifth current mirror 132 have the same input terminal. The output terminal of the fourth current mirror 131 is the first output terminal of the third current copy unit 130 . The output terminal of the fifth current mirror 132 is the second output terminal of the third current copy unit 130 .

[0063] In this embodiment, the primary function of the fourth current mirror 131 and the fifth current mirror 132 is also to replicate or "mirror" the input current, generating a current at the output terminal that is identical to or proportional to the input current. The output terminal of the fourth current mirror 131 is used to output current to the second current replicating unit 120, and the output terminal of the fifth current mirror 132 is connected to the lower threshold voltage output terminal to output the lower threshold voltage.

[0064] Optionally, the fourth current mirror 131 includes a ninth switch tube Q9 , a tenth switch tube Q10 , and an eleventh switch tube Q11 .

[0065] The base of the tenth switching tube Q10 is connected to the collector of the eleventh switching tube Q11, the base of the eleventh switching tube Q11 is connected to the emitter of the tenth switching tube Q10, the collector of the eleventh switching tube Q11 is the input end of the fourth current mirror 131, the emitter of the eleventh switching tube Q11 is grounded, and the collector of the tenth switching tube Q10 is connected to a preset power supply.

[0066] The base of the eleventh switch tube Q11 is also connected to the base of the ninth switch tube Q9 . The collector of the ninth switch tube Q9 is the output end of the fourth current mirror 131 . The emitter of the ninth switch tube Q9 is grounded.

[0067] Continue to refer Figure 4The ninth switch tube Q9, the tenth switch tube Q10, and the eleventh switch tube Q11 are all NPN transistors. The ninth switch tube Q9, the tenth switch tube Q10, and the eleventh switch tube Q11 form a current source with an emitter follower. The collector of the eleventh switch tube Q11 serves as the input end of the fourth current mirror 131. The base and emitter of the tenth switch tube Q10 are connected to the collector and base of the eleventh switch tube Q11, respectively. By adding the tenth switch tube Q10, the current flowing through the base of the eleventh switch tube Q11 is reduced. When the characteristics of the ninth switch tube Q9, the tenth switch tube Q10, and the eleventh switch tube Q11 are completely the same, the current flowing through the ninth switch tube Q9 is equal to the current flowing through the base of the eleventh switch tube Q11. The currents in the collectors of the switching tube Q9 and the collectors of the eleventh switching tube Q11 are equal. When the regulated voltage is greater than the bias voltage between the base and emitter of the ninth switching tube Q9, the ninth switching tube Q9 is in the amplification region, resulting in a larger collector-emitter resistance of the ninth switching tube Q9. As a result, the current output by the ninth switching tube Q9 is maintained at a low level. The third current mirror 121 acts as a bias and temperature compensation, so that the current flowing through the third current mirror 121 is also small, and the influence of the current on the first voltage regulating resistor R6 and the second voltage regulating resistor R7 in the output unit 140 is also reduced. This accurately realizes the voltage division of the regulated voltage and improves the stability of the voltage regulation circuit.

[0068] Optionally, the fifth current mirror 132 includes a tenth switch tube Q10 , an eleventh switch tube Q11 , and a twelfth switch tube Q12 .

[0069] The base of the twelfth switch tube Q12 is also connected to the base of the eleventh switch tube Q11 . The emitter of the twelfth switch tube Q12 is grounded. The collector of the twelfth switch tube Q12 is the output end of the fifth current mirror 132 and is connected to the lower threshold voltage output end.

[0070] Continue to refer Figure 4 The twelfth switch tube Q12 is also an NPN transistor. The fourth current mirror 131 and the fifth current mirror 132 have the same input terminal. The collector of the eleventh switch tube Q11 is also the input terminal of the fifth current mirror 132, and the collector of the twelfth switch tube Q12 is the output terminal of the fifth current mirror 132.

[0071] Specifically, the current flowing through the collector of the twelfth switch tube Q12 is the same as the current flowing through the collector of the eleventh switch tube Q11. The current flowing through the collector of the eleventh switch tube Q11 is Since the resistance values ​​of the second resistor R2 and the fourth resistor R4 are the same, the current flowing through the collector of the eleventh switch tube Q11 is also .

[0072] The current flowing through the collector of the twelfth switch tube Q12 is , that is, the current outputted from the output terminal of the fifth current mirror 132 is expressed as: .

[0073] Since the collector of the twelfth switch Q12 is also connected to the lower threshold voltage output terminal, the lower threshold voltage outputted by the lower threshold voltage output terminal is: ,in, Expressed as the lower threshold voltage, It is represented by the resistance value of the second voltage regulating resistor R7, Indicates the reference voltage.

[0074] Figure 5 A graph showing different input regulation voltages and currents flowing through the fifth resistor is provided in an embodiment of the present application, such as Figure 5 As shown, when the adjustment voltage input terminal (WINDOW ADJUST) inputs an adjustment voltage of 0.7V to 4V and the reference voltage input terminal (Vref) inputs a fixed reference voltage of 2.5V, the simulation input and the current flowing through the fifth resistor R5 change linearly with the input adjustment voltage, and its slope is the resistance value of the fifth resistor R5.

[0075] Figure 6 A graph showing different input regulation voltages and upper threshold voltages provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, when the adjustment voltage input terminal (WINDOW ADJUST) inputs an adjustment voltage of 0.7V to 4V and the reference voltage input terminal (Vref) inputs a fixed reference voltage of 2.5V, the voltage of the simulation input and the upper threshold voltage output terminal (OV THRESH) changes linearly with the input adjustment voltage, and the slope can be changed by changing the size of the first voltage adjustment resistor R6.

[0076] Figure 7 A graph showing different input regulation voltages and lower threshold voltages provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, when an adjustment voltage ranging from 0.7V to 4V is input to the adjustment voltage input terminal (WINDOW ADJUST) and a fixed reference voltage of 2.5V is input to the reference voltage input terminal (Vref), the voltage at the simulated input and the lower threshold voltage output terminal (UV THRESH) change linearly with the adjustment voltage input, and the slope can be changed by changing the size of the second voltage adjustment resistor R7.

[0077] Figure 8 A graph showing different temperatures, upper threshold voltages, and lower threshold voltages is provided in an embodiment of the present application. Figure 8As shown in FIG. 1 , when the temperature changes from -55 degrees Celsius to 125 degrees Celsius, both the upper threshold voltage and the lower threshold voltage change by about 2.5 mV, which demonstrates that the voltage regulation circuit has strong stability.

[0078] An embodiment of the present application also provides an integrated circuit based on a voltage regulation circuit, which includes: a voltage regulation circuit and an external device; the upper threshold voltage output terminal and the lower threshold voltage output terminal of the voltage regulation circuit are used to connect to the external device, the voltage regulation circuit adjusts the input regulation voltage to obtain the upper threshold voltage and the lower threshold voltage, and outputs them to the external device to meet the power supply requirements of different external devices. The voltage regulation circuit is not described in detail here.

[0079] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A voltage regulating circuit, characterized in that: The voltage regulating circuit includes: a first current copy unit, a second current copy unit, a third current copy unit and an output unit; A power supply terminal of the first current replication unit is connected to a preset power supply, a first output terminal of the first current replication unit is connected to an input terminal of the second current replication unit, a second output terminal of the first current replication unit is connected to an input terminal of the third current replication unit, and a third output terminal of the first current replication unit is connected to an upper threshold voltage output terminal to output an upper threshold voltage; The output end of the second current replication unit is connected to the input end of the first current replication unit, the power end of the second current replication unit is connected to the first output end of the third current replication unit, and the power end of the second current replication unit is further connected to the regulated voltage input end to obtain the input regulated voltage; The power supply end of the third current replication unit is grounded, and the second output end of the third current replication unit is connected to the lower threshold voltage output end to output the lower threshold voltage; the output unit is connected between the upper threshold voltage output end and the lower threshold voltage output end, and the output unit is also connected to the reference voltage input end to obtain the input reference voltage.

2. The circuit according to claim 1, wherein: The first current copy unit includes: a first current mirror and a second current mirror; The first current mirror and the second current mirror have the same input end, the first output end and the second output end of the first current mirror are respectively the first output end and the second output end of the first current replication unit, and the output end of the second current mirror is the third output end of the first current replication unit.

3. The circuit according to claim 2, characterized in that The first current copy unit further includes: a first resistor, a second resistor and a third resistor; the first current mirror includes: a first switch tube, a second switch tube, a third switch tube and a fifth switch tube; The base of the third switching tube is connected to the emitter of the fifth switching tube, the base of the fifth switching tube is connected to the collector of the third switching tube, the collector of the third switching tube is the input end of the first current mirror, and the collector of the fifth switching tube is grounded; The base of the third switching tube is further connected to the base of the first switching tube and the base of the second switching tube, and the emitter of the first switching tube, the emitter of the second switching tube and the emitter of the third switching tube are connected to the preset power supply through the first resistor, the second resistor and the third resistor respectively; The collector of the first switching tube and the collector of the second switching tube are respectively the first output end and the second output end of the first current mirror.

4. The circuit according to claim 3, characterized in that The first current copy unit further includes: a fourth resistor; the second current mirror includes: the third switch tube, the fifth switch tube and the fourth switch tube; The base of the fourth switching tube is also connected to the base of the third switching tube, the emitter of the fourth switching tube is also connected to the preset power supply through the fourth resistor, and the collector of the fourth switching tube is the output end of the second current mirror, which is used to connect to the upper threshold voltage output end.

5. The circuit according to claim 1, wherein: The second current copy unit includes: a third current mirror; An input end of the third current mirror is an input end of the second current copy unit, and an output end of the third current mirror is an output end of the second current copy unit.

6. The circuit according to claim 5, characterized in that The second current copy unit further includes: a fifth resistor, and the third current mirror includes: a sixth switch tube, a seventh switch tube, and an eighth switch tube; The base of the sixth switching tube is connected to the collector of the seventh switching tube, the emitter of the sixth switching tube is connected to the base of the seventh switching tube, the collector of the sixth switching tube is connected to a preset power supply, the emitter of the seventh switching tube is the power supply terminal of the third current mirror, and the collector of the seventh switching tube is the input terminal of the third current mirror; The base of the seventh switching tube is also connected to the base of the eighth switching tube, the collector of the eighth switching tube is the output end of the third current mirror, and the emitter of the eighth switching tube is grounded through the fifth resistor.

7. The circuit according to claim 1, wherein: The third current copy unit includes: a fourth current mirror and a fifth current mirror; The fourth current mirror and the fifth current mirror have the same input terminal, the output terminal of the fourth current mirror is the first output terminal of the third current replication unit, and the output terminal of the fifth current mirror is the second output terminal of the third current replication unit.

8. The circuit according to claim 7, characterized in that The fourth current mirror includes: a ninth switch tube, a tenth switch tube and an eleventh switch tube; The base of the tenth switching tube is connected to the collector of the eleventh switching tube, the base of the eleventh switching tube is connected to the emitter of the tenth switching tube, the collector of the eleventh switching tube is the input end of the fourth current mirror, the emitter of the eleventh switching tube is grounded, and the collector of the tenth switching tube is connected to a preset power supply; The base of the eleventh switching tube is also connected to the base of the ninth switching tube, the collector of the ninth switching tube is the output end of the fourth current mirror, and the emitter of the ninth switching tube is grounded.

9. The circuit according to claim 8, characterized in that The fifth current mirror includes: the tenth switch tube, the eleventh switch tube and the twelfth switch tube; The base of the twelfth switch tube is also connected to the base of the eleventh switch tube, the emitter of the twelfth switch tube is grounded, and the collector of the twelfth switch tube is the output end of the fifth current mirror, which is used to connect to the lower threshold voltage output end.

10. The circuit according to claim 1, wherein: The output unit includes: a first voltage regulating resistor and a second voltage regulating resistor, the first voltage regulating resistor and the second voltage regulating resistor are connected in series between the upper threshold voltage output terminal and the lower threshold voltage output terminal, and the series connection point of the first voltage regulating resistor and the second voltage regulating resistor is connected to the reference voltage input terminal.

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