Clamp voltage control circuit and integrated circuit chip
By designing a clamp voltage control circuit including clamp module, voltage regulation module, voltage division module and output module, the problem of poor power suppression ability in the prior art is solved, and stable control of clamp voltage and power supply is realized Effective suppression of voltage mutation.
Patent Information
- Application Number
- CN202411617418.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-02-18
AI Technical Summary
The power supply suppression capability of existing clamp voltage control circuits is poor and cannot effectively stabilize the clamp voltage, especially when the power supply voltage changes suddenly.
A clamp voltage control circuit including clamping module, voltage regulation module, voltage division module and output module is designed. The clamping module controls the current of the voltage division module, adjusts the current and voltage of the voltage regulation module, and stabilizes the output module. current, thereby controlling the magnitude of the clamp voltage.
It effectively suppresses the sudden change in the power supply voltage, maintains the stability of the clamp voltage, and improves the power supply suppression ability.
Smart Images
Figure CN119472906A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of integrated circuits, and in particular to a clamping voltage control circuit and an integrated circuit chip. Background Art
[0002] Clamp Voltage refers to the voltage value that is limited to a specific range in a circuit by some means.
[0003] Currently, the power supply voltage can be divided by a resistor divider or a current mirror circuit to output a clamped voltage. However, these methods have poor power supply suppression capabilities and require a high power supply voltage.
[0004] Therefore, how to improve the power supply rejection capability of the clamping voltage control circuit is a more important issue. Summary of the invention
[0005] The present application provides a clamping voltage control circuit and an integrated circuit chip for improving power supply suppression capability.
[0006] In a first aspect, the present application provides a clamping voltage control circuit, the circuit comprising: a clamping module, a voltage regulating module, a voltage dividing module and an output module;
[0007] The first end of the voltage divider module receives a power supply voltage;
[0008] The first end of the clamping module is connected to the second end of the voltage dividing module, the second end of the clamping module is connected to the third end of the voltage dividing module, and the third end of the clamping module is grounded;
[0009] The first end of the voltage regulating module is connected to the third end of the voltage dividing module, and the second end of the voltage regulating module is connected to the third end of the clamping module;
[0010] The first end of the output module is connected to the first end of the voltage dividing module, the second end of the output module is connected to the first end of the voltage regulating module, and the third end of the output module is used to output the clamping voltage;
[0011] The clamping module is used to control the current of the voltage dividing module to adjust the current of the voltage regulating module to adjust the voltage of the voltage regulating module;
[0012] The voltage of the voltage regulating module is used to stabilize the current of the output module to control the magnitude of the clamping voltage.
[0013] In some embodiments, the clamping module is used to control the current between the first end and the second end of the voltage dividing module to be greater than the current between the second end and the third end of the voltage dividing module, so as to adjust the current of the voltage regulating module, so as to adjust the voltage of the voltage regulating module;
[0014] The voltage at the first terminal of the voltage regulating module is used to stabilize the current between the first terminal and the third terminal of the output module to control the magnitude of the clamping voltage.
[0015] In some embodiments, the voltage dividing module includes a first resistor and a second resistor;
[0016] The first end of the first resistor serves as the first end of the voltage divider module, the second end of the first resistor is connected to the first end of the second resistor and serves as the second end of the voltage divider module, and the second end of the second resistor serves as the third end of the voltage divider module;
[0017] The clamping module is used to control the current flowing through the first resistor to be greater than the current flowing through the second resistor.
[0018] In some embodiments, the clamp module includes: a PNP-type transistor;
[0019] The emitter of the PNP transistor serves as the first end of the clamping module, the base of the PNP transistor serves as the second end of the clamping module, and the collector of the PNP transistor serves as the third end of the clamping module;
[0020] The collector current of the PNP transistor is greater than the base current, so as to control the current between the first end and the second end of the voltage divider module to be greater than the current between the second end and the third end of the voltage divider module.
[0021] In some embodiments, the clamp module includes: a first P-type transistor;
[0022] The source of the first P-type transistor serves as the first end of the clamping module, the gate of the first P-type transistor serves as the second end of the clamping module, and the drain of the first P-type transistor serves as the third end of the clamping module;
[0023] The source current of the first P-type transistor is greater than the gate current, so as to control the current between the first end and the second end of the voltage divider module to be greater than the current between the second end and the third end of the voltage divider module;
[0024] Or, the voltage regulating module includes cascaded first N-type transistors, and the drain and gate of each stage of the first N-type transistor are connected;
[0025] The source of the first N-type transistor of the first stage serves as the second end of the voltage regulating module, and the drain of the first N-type transistor of the last stage serves as the first end of the voltage regulating module.
[0026] In some embodiments, the voltage regulating module includes cascaded second P-type transistors, and the drain and gate of each stage of the second P-type transistor are connected;
[0027] The drain of the second P-type transistor at the first stage serves as the second end of the voltage regulating module, and the source of the second P-type transistor at the last stage serves as the first end of the voltage regulating module.
[0028] In some embodiments, the voltage regulation module includes cascaded diodes;
[0029] The anode of the first-stage diode serves as the second end of the voltage regulating module, and the cathode of the last-stage diode serves as the first end of the voltage regulating module.
[0030] In some embodiments, the output module includes a second N-type transistor and a third resistor;
[0031] The first end of the third resistor serves as the first end of the output module, the second end of the third resistor is connected to the drain of the second N-type transistor, the gate of the second N-type transistor serves as the second end of the output module, and the source of the second N-type transistor serves as the third end of the output module;
[0032] The voltage of the voltage regulating module is used to stabilize the on-current of the second N-type transistor to control the magnitude of the clamping voltage.
[0033] In some embodiments, the clamping voltage is a difference between a sum of gate-source voltages of transistors in the voltage regulating module and a gate-source voltage of the second N-type transistor.
[0034] In a second aspect, the present application provides an integrated circuit chip, comprising the clamping voltage control circuit described above.
[0035] The clamping voltage control circuit and integrated circuit chip provided by the present application include a clamping module, a voltage regulating module, a voltage dividing module and an output module; the first end of the voltage dividing module receives the power supply voltage; the first end of the clamping module is connected to the second end of the voltage dividing module, the second end of the clamping module is connected to the third end of the voltage dividing module, and the third end of the clamping module is grounded; the first end of the voltage regulating module is connected to the third end of the voltage dividing module, and the second end of the voltage regulating module is connected to the third end of the clamping module; the first end of the output module is connected to the first end of the voltage dividing module, the second end of the output module is connected to the first end of the voltage regulating module, and the third end of the output module is used to output the clamping voltage. The clamping module is used to control the current of the voltage dividing module to adjust the current of the voltage regulating module, so that the voltage of the voltage regulating module can be adjusted. The voltage of the voltage regulating module is used to stabilize the current of the output module to control the size of the clamping voltage. In the solution of the present application, when a sudden change occurs in the power supply voltage, most of the sudden current generated will flow from the clamping module to the ground, and a smaller part will flow through the voltage regulating module, so that the voltage change of the voltage regulating module is smaller, thereby making the current change of the output module smaller, and further making the clamping voltage not produce a large change, thereby effectively suppressing the sudden change of the power supply voltage. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0037] Figure 1 is a schematic diagram of a clamping voltage control circuit;
[0038] Figure 2 is a schematic diagram of another clamping voltage control circuit;
[0039] Figure 3 is a schematic diagram of yet another clamping voltage control circuit;
[0040] Figure 4 A schematic diagram of a clamping voltage control circuit provided in an embodiment of the present application;
[0041] Figure 5 A schematic diagram of a clamping voltage control circuit provided by an embodiment of the present application;
[0042] Figure 6 A schematic diagram of another clamping voltage control circuit provided by an embodiment of the present application;
[0043] Figure 7 A schematic diagram of another clamping voltage control circuit provided by an embodiment of the present application;
[0044] Figure 8 A schematic diagram of yet another clamping voltage control circuit provided in an embodiment of the present application. DETAILED DESCRIPTION
[0045] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0046] The terms "first", "second", etc. in the specification and claims of this application and the following drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances. For example, without departing from the scope of this document, the first power supply area can also be referred to as the second power supply area, and similarly, the second power supply area can also be referred to as the first power supply area.
[0047] Furthermore, as used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context indicates otherwise.
[0048] It should be further understood that the terms “comprises” and “includes” indicate the presence of the described features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups.
[0049] Clamp Voltage refers to the voltage value that is limited to a specific range in a circuit by some means.
[0050] Figure 1 A circuit diagram of a clamping voltage control circuit is shown. Figure 1 As shown, the clamping voltage control circuit includes two resistors R1 and R2 connected in series, the first end of the resistor R1 receives the power supply voltage VIN, the second end of the resistor R1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is grounded, so as to utilize the two resistors to divide the received power supply voltage VIN into a smaller voltage, and this smaller voltage can be used as the clamping voltage Vclamp.
[0051] but, Figure 1 In the clamping voltage control circuit shown, the output clamping voltage Vclamp fluctuates with the fluctuation of the power supply voltage VIN (ie, the power supply voltage VIN has poor suppression capability), has no load carrying capability, and the power consumption increases with the increase of the power supply voltage VIN.
[0052] Figure 2 A circuit diagram of another clamping voltage control circuit is shown, such as Figure 2 As shown, the clamping voltage control circuit includes a P-type transistor P1, a P-type transistor P2, a current source A1, an N-type transistor N1, an N-type transistor N2, an N-type transistor N3 and an N-type transistor N4.
[0053] For ease of description, P-type transistor P1 is referred to as P1, P-type transistor P2 is referred to as P2, current source A1 is referred to as A1, N-type transistor N1 is referred to as N1, N-type transistor N2 is referred to as N2, N-type transistor N3 is referred to as N3, and N-type transistor N4 is referred to as N4.
[0054] The source of P1 is connected to the source of P2 and receives the power supply voltage VIN, the gate and drain of P1 are connected and connected to the gate of P2, the first end of A1 is connected to the gate and drain of P1, and the second end of A1 is grounded.
[0055] The gate and drain of N1 are connected, and connected to the drain of P2 and the gate of N2. The drain of N2 is connected to the source of P2. The source of N2 is connected to the gate and drain of N4 and serves as the output end of the clamping voltage Vclamp. The drain of N3 is connected to the source of N1, the gate of N3 is connected to the gate and drain of N4, and the source of N3 is connected to the source of N4 and grounded.
[0056] For example, A1 can provide a constant current. Since the gate and drain of P1 are connected together, the gate-source voltage of P1 will automatically adjust to meet the constant current provided by A1, that is, this constant current determines the gate-source voltage of P1.
[0057] Since the gate-source voltage of P1 is equal to the gate-source voltage of P2, when the constant current provided by A1 is large enough, the gate-source voltage of P1 is small, and the gate-source voltage of P2 is also small, and P2 is turned on. Since the drain and gate of N1 are connected together, and the gate of N1 is connected to the gate of N2, N1 and N2 are turned on.
[0058] Since the gate and drain of N4 are connected together and connected to the gate of N3, the gates of N3 and N4 can receive corresponding voltages and be turned on. At this time, the currents of N1 and N2 are mirrored, so that a relatively stable clamping voltage Vclamp can be output.
[0059] but, Figure 2 The clamping voltage control circuit shown can only output voltage but has no load capacity. A sudden change in the power supply voltage will cause the current flowing through to change, thereby causing a sudden change in the output clamping voltage Vclamp. In addition, the current is mirrored through a current mirror, which makes the overall circuit area larger.
[0060] Figure 3 A circuit diagram of another clamping voltage control circuit is shown, such as Figure 3 As shown, the clamping voltage control circuit includes a resistor R1 and a Zener diode zener connected in series, the first end of the resistor R1 receives the power supply voltage VIN, the second end of the resistor R1 is connected to the first end of the Zener diode zener, and the second end of the Zener diode zener is grounded to form a clamping voltage Vclamp using the Zener diode zener.
[0061] but, Figure 3 In the clamping voltage control circuit shown, the minimum power supply voltage requirement is relatively high, for example, the minimum is greater than 6.5V, there is no load capacity, the power supply suppression capability is poor, and under high power supply voltage, the resistance value of resistor R1 is required to be large, and the current formed cannot exceed the working current of the Zener diode zener.
[0062] Therefore, the clamping voltage control circuit in the above example has no load capacity, poor power supply rejection capability, and has high requirements on the power supply voltage.
[0063] In response to the above problems, the present application proposes a clamping voltage control circuit. When the power supply voltage suddenly changes, most of the sudden current generated will flow from the clamping module to the ground, and a smaller part will flow through the voltage regulating module, so that the voltage change of the voltage regulating module is smaller, thereby making the current change of the output module smaller, and further making the clamping voltage not produce a large change, effectively suppressing the sudden change of the power supply voltage.
[0064] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
[0065] Figure 4 FIG. 1 is a circuit diagram of a clamping voltage control circuit provided by an embodiment of the present application. Figure 4 As shown, the clamping voltage Vclamp control circuit provided in this embodiment includes: a clamping module 10, a voltage regulating module 20, a voltage dividing module 30 and an output module 40. The clamping module 10 includes a first end, a second end and a third end, the voltage regulating module 20 includes a first end and a second end, the voltage dividing module 30 includes a first end, a second end and a third end, and the output module 40 includes a first end, a second end and a third end.
[0066] The first end of the voltage divider module 30 receives the power supply voltage VIN; the first end of the clamp module 10 is connected to the second end of the voltage divider module 30, the second end of the clamp module 10 is connected to the third end of the voltage divider module 30, and the third end of the clamp module 10 is grounded; the first end of the voltage regulating module 20 is connected to the third end of the voltage divider module 30, and the second end of the voltage regulating module 20 is connected to the third end of the clamp module 10; the first end of the output module 40 is connected to the first end of the voltage divider module 30, the second end of the output module 40 is connected to the first end of the voltage regulating module 20, and the third end of the output module 40 is used to output the clamp voltage Vclamp.
[0067] The clamping module 10 is used to control the current of the voltage dividing module 30 to adjust the current of the voltage regulating module 20, thereby adjusting the voltage of the voltage regulating module 20; the voltage of the voltage regulating module 20 is used to stabilize the current of the output module 40 to control the size of the clamping voltage Vclamp.
[0068] In the embodiment of the present application, due to the presence of the clamping module 10, when the power supply voltage VIN suddenly changes, most of the sudden current generated can flow from the clamping module 10 to the ground, and a smaller part will flow through the voltage regulating module 20, so that the voltage change of the voltage regulating module 20 is smaller, thereby making the current change of the output module 40 smaller, and further making the clamping voltage Vclamp will not produce a large change, effectively suppressing the sudden change of the power supply voltage VIN.
[0069] In some embodiments, the clamping module 10 is used to control the current between the first end and the second end of the voltage divider module 30 to be greater than the current between the second end and the third end of the voltage divider module 30, so as to adjust the current of the voltage regulating module 20, and then adjust the voltage of the voltage regulating module 20. The voltage of the voltage regulating module 20 is used to control the current between the first end and the third end of the output module 40 to control the magnitude of the clamping voltage Vclamp. By controlling the current between the first end and the second end of the voltage divider module 30 by the clamping module 10 to be greater than the current between the second end and the third end of the voltage divider module 30, the current flowing through the voltage regulating module 20 changes less, so that the voltage of the voltage regulating module 20 changes less, and thus the current of the output module 40 changes less, effectively suppressing the sudden change of the power supply voltage VIN.
[0070] In some examples, such as Figure 5-Figure 8As shown, the voltage divider module 30 includes a first resistor R10 and a second resistor R20. The first end of the first resistor R10 serves as the first end of the voltage divider module 30, the second end of the first resistor R10 is connected to the first end of the second resistor R20, and serves as the second end of the voltage divider module 30, and the second end of the second resistor R20 serves as the third end of the voltage divider module 30. The clamp module 10 is used to control the current flowing through the first resistor R10 to be greater than the current flowing through the second resistor R20, so that the current flowing through the first resistor R10 can be increased by the clamp module 10, so that the first resistor R10 has a larger voltage drop, thereby reducing the area required for the first resistor R10.
[0071] In some examples, such as Figure 5 and Figure 6 As shown, the clamping module 10 includes a PNP transistor Q1, the emitter of the PNP transistor Q1 is used as the first end of the clamping module 10, the base of the PNP transistor Q1 is used as the second end of the clamping module 10, and the collector of the PNP transistor Q1 is used as the third end of the clamping module 10. Since the current of the transistor has the characteristic of Ic=βIb, the collector current flowing through the transistor is much larger than the base current, so that the current between the first end and the second end of the voltage divider module 30 is larger than the current between the second end and the third end of the voltage divider module 30, for example, the current flowing through the first resistor R10 is larger than the current flowing through the second resistor R20, so that there is a larger voltage drop on the first resistor R10. Among them, Ic represents the collector current, Ib represents the base current, and β represents how many times the base current is amplified to become the collector current under certain working conditions. It is a dimensionless parameter, usually between tens and hundreds, and the specific value depends on the type of transistor and the working conditions.
[0072] In other examples, such as Figure 7 and Figure 8 As shown, the clamping module includes a first P-type transistor M20, the source of the first P-type transistor M20 serves as the first end of the clamping module 10, the gate of the first P-type transistor M20 serves as the second end of the clamping module 10, and the drain of the first P-type transistor M20 serves as the third end of the clamping module 10. Since in a P-type transistor, the source current is much larger than the gate current. The gate current is very small due to the presence of the insulating layer and can be almost ignored, while the source current is the actual working current, which is usually much larger than the gate current. Therefore, the source current flowing through the first P-type transistor M20 is much larger than the gate current, so that the current between the first end and the second end of the voltage divider module 30 is greater than the current between the second end and the third end of the voltage divider module 30. For example, the current flowing through the first resistor R10 is greater than the current flowing through the second resistor R20, so that there is a large voltage drop on the first resistor R10.
[0073] In some examples, such as Figure 5-Figure 8As shown, the output module includes a second N-type transistor M10 and a third resistor R30. The first end of the third resistor R30 serves as the first end of the output module 40, the second end of the third resistor R30 is connected to the drain of the second N-type transistor M10, the gate of the second N-type transistor M10 serves as the second end of the output module 40, and the source of the second N-type transistor M10 serves as the third end of the output module 40. The voltage of the voltage regulating module 20 is used to control the gate voltage of the second N-type transistor M10 to stabilize the on-current of the second N-type transistor M10 (that is, the drain current of the second N-type transistor M10), thereby controlling the magnitude of the clamping voltage Vclamp. It can be understood that the on-current of the second N-type transistor M10 is related to the on-degree of the second N-type transistor M10, and the on-degree of the second N-type transistor M10 is related to the gate voltage of the second N-type transistor M10, so the on-current of the second N-type transistor M10 can be stabilized by the voltage of the voltage regulating module 20.
[0074] In some examples, such as Figure 5 and Figure 7 As shown, the voltage regulating module 20 includes cascaded first N-type transistors M1 to Mn, that is, in two adjacent first N-type transistors, the drain of the first N-type transistor of the previous level is connected to the source of the first N-type transistor of the next level. The drain and gate of each first N-type transistor are connected. The source of the first N-type transistor M1 of the first level serves as the second end of the voltage regulating module 20, and the drain of the last first N-type transistor Mn serves as the first end of the voltage regulating module 20.
[0075] Accordingly, when the power supply voltage VIN is used as a high-voltage power input, current can flow through the voltage divider module 30 (e.g., the first resistor and the second resistor) and the cascaded first N-type transistors M1 to Mn to generate the gate-source voltage of each first N-type transistor. Due to the effect of the clamping module 10, the current flowing through the diode-connected first N-type transistors M1 to Mn is small, so the gate-source voltage of each first N-type transistor is small, and the design of the clamping voltage is more flexible. In addition, due to the small gate-source voltage, the current change of the output module 40 is small, and the clamping voltage Vclamp is relatively stable, and basically does not change with the change of the power supply voltage VIN.
[0076] At this time, the clamping voltage Vclamp is the difference between the sum of the gate-source voltages of the first N-type transistors M1 to Mn in the voltage regulating module 20 and the second N-type transistor M10. Specifically, it can be obtained by the following formula:
[0077] Vclamp=Vgs1+…+Vgsn-Vgs10
[0078] Among them, Vclamp represents the clamping voltage, Vgs1 represents the gate-source voltage of the first cascaded first N-type transistor, Vgsn represents the gate-source voltage of the nth cascaded first N-type transistor, that is, the gate-source voltage of the last cascaded first N-type transistor, and Vgs10 represents the gate-source voltage of the second N-type transistor.
[0079] For example, the number of first N-type transistors can be determined according to the voltage value of the clamping voltage. For example, when the voltage value of the clamping voltage is larger, the number of first N-type transistors is larger, and when the voltage value of the clamping voltage is smaller, the number of first N-type transistors is smaller.
[0080] In other examples, such as Figure 6 and Figure 8 As shown, the voltage regulating module 20 includes cascaded second P-type transistors M11 to Mn1, that is, in two adjacent second P-type transistors, the source of the second P-type transistor of the previous level is connected to the drain of the second P-type transistor of the next level. The drain and gate of each level of the second P-type transistor are connected. The drain of the first level second P-type transistor M11 serves as the second end of the voltage regulating module 20, and the source of the last level second P-type transistor Mn1 serves as the first end of the voltage regulating module 20.
[0081] Accordingly, when the power supply voltage VIN is used as a high-voltage power input, the current can flow through the voltage divider module 30 (for example, the first resistor and the second resistor) and the cascaded second P-type transistors M11 to Mn1 to generate the gate-source voltage of each second P-type transistor. Due to the effect of the clamping module 10, the current flowing through the diode-connected second P-type transistors M11 to Mn1 is small, so the source-gate voltage of each second P-type transistor is small, and the design of the clamping voltage is more flexible. In addition, due to the small source-gate voltage, the current change of the output module 40 is small, and the clamping voltage Vclamp is relatively stable, and basically does not change with the change of the power supply voltage VIN.
[0082] At this time, the clamping voltage Vclamp is the difference between the sum of the gate-source voltages of the second P-type transistors M11 to Mn1 in the voltage regulating module 20 and the second N-type transistor M10. Specifically, it can be obtained by the following formula:
[0083] Vclamp=Vsg11+…+Vsgn1-Vgs10
[0084] Among them, Vclamp represents the clamping voltage, Vsh11 represents the gate-source voltage of the first cascaded first P-type transistor, Vgsn represents the gate-source voltage of the nth cascaded first P-type transistor, that is, the gate-source voltage of the last cascaded first P-type transistor, and Vgs10 represents the gate-source voltage of the second N-type transistor.
[0085] In some other examples, the voltage regulating module 20 includes cascaded diodes, that is, in two adjacent diodes, the cathode of the upper diode is connected to the anode of the lower diode. The anode of the first diode serves as the second end of the voltage regulating module 20, and the cathode of the last diode serves as the first end of the voltage regulating module 20. Due to the effect of the clamping module 10, the current flowing through the diode is small, that is, the reverse current of the diode is small, so that the voltage of the voltage regulating module 20 is small, and then the clamping voltage Vclamp is relatively stable and basically does not change with the change of the power supply voltage VIN.
[0086] In the above example, the clamping voltage control circuit does not require special devices such as isolation tubes and Zener diodes, and has low process requirements. In addition, there is no loop, so loop compensation does not need to be considered.
[0087] The clamping voltage control circuit provided in an embodiment of the present application is described above. An embodiment of the present application further provides an integrated circuit chip, including the above-mentioned clamping voltage control circuit.
[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A clamping voltage control circuit, characterized in that: The circuit comprises: Clamping module, voltage regulating module, voltage dividing module and output module; The first end of the voltage divider module receives a power supply voltage; The first end of the clamping module is connected to the second end of the voltage dividing module, the second end of the clamping module is connected to the third end of the voltage dividing module, and the third end of the clamping module is grounded; The first end of the voltage regulating module is connected to the third end of the voltage dividing module, and the second end of the voltage regulating module is connected to the third end of the clamping module; The first end of the output module is connected to the first end of the voltage dividing module, the second end of the output module is connected to the first end of the voltage regulating module, and the third end of the output module is used to output the clamping voltage; The clamping module is used to control the current of the voltage dividing module to adjust the current of the voltage regulating module to adjust the voltage of the voltage regulating module; The voltage of the voltage regulating module is used to stabilize the current of the output module to control the magnitude of the clamping voltage.
2. The clamping voltage control circuit according to claim 1, characterized in that: The clamping module is used to control the current between the first end and the second end of the voltage dividing module to be greater than the current between the second end and the third end of the voltage dividing module, so as to adjust the current of the voltage regulating module and thus adjust the voltage of the voltage regulating module; The voltage at the first terminal of the voltage regulating module is used to stabilize the current between the first terminal and the third terminal of the output module to control the magnitude of the clamping voltage.
3. The clamping voltage control circuit according to claim 2, characterized in that: The voltage dividing module includes a first resistor and a second resistor; The first end of the first resistor serves as the first end of the voltage divider module, the second end of the first resistor is connected to the first end of the second resistor and serves as the second end of the voltage divider module, and the second end of the second resistor serves as the third end of the voltage divider module; The clamping module is used to control the current flowing through the first resistor to be greater than the current flowing through the second resistor.
4. The clamping voltage control circuit according to claim 2, characterized in that: The clamp module includes: a PNP type transistor; The emitter of the PNP transistor serves as the first end of the clamping module, the base of the PNP transistor serves as the second end of the clamping module, and the collector of the PNP transistor serves as the third end of the clamping module; The collector current of the PNP transistor is greater than the base current, so as to control the current between the first end and the second end of the voltage divider module to be greater than the current between the second end and the third end of the voltage divider module.
5. The clamping voltage control circuit according to claim 2, characterized in that: The clamp module includes: a first P-type transistor; The source of the first P-type transistor serves as the first end of the clamping module, the gate of the first P-type transistor serves as the second end of the clamping module, and the drain of the first P-type transistor serves as the third end of the clamping module; The source current of the first P-type transistor is greater than the gate current, so as to control the current between the first end and the second end of the voltage divider module to be greater than the current between the second end and the third end of the voltage divider module; Or, the voltage regulating module includes cascaded first N-type transistors, and the drain and gate of each stage of the first N-type transistor are connected; The source of the first N-type transistor of the first stage serves as the second end of the voltage regulating module, and the drain of the first N-type transistor of the last stage serves as the first end of the voltage regulating module.
6. The clamping voltage control circuit according to claim 1, characterized in that: The voltage regulating module comprises a cascade of second P-type transistors, wherein the drain and gate of each stage of the second P-type transistor are connected; The drain of the second P-type transistor at the first stage serves as the second end of the voltage regulating module, and the source of the second P-type transistor at the last stage serves as the first end of the voltage regulating module.
7. The clamping voltage control circuit according to claim 1, characterized in that: The voltage regulating module includes cascaded diodes; The anode of the first-stage diode serves as the second end of the voltage regulating module, and the cathode of the last-stage diode serves as the first end of the voltage regulating module.
8. The clamping voltage control circuit according to claim 5 or 6, characterized in that: The output module includes a second N-type transistor and a third resistor; The first end of the third resistor serves as the first end of the output module, the second end of the third resistor is connected to the drain of the second N-type transistor, the gate of the second N-type transistor serves as the second end of the output module, and the source of the second N-type transistor serves as the third end of the output module; The voltage of the voltage regulating module is used to stabilize the on-current of the second N-type transistor to control the magnitude of the clamping voltage.
9. The clamping voltage control circuit according to claim 8, characterized in that: The clamping voltage is a difference between the sum of the gate-source voltages of the transistors in the voltage regulating module and the gate-source voltage of the second N-type transistor.
10. An integrated circuit chip, comprising the clamping voltage control circuit according to any one of claims 1 to 9.