Driving circuit, charge pump, chip and electronic equipment

Abstract

The invention provides a driving circuit, a charge pump, a chip and an electronic device, in any level of energy storage branch of the charge pump, through the arrangement of a voltage stabilizing diode, a voltage division circuit, a switching tube and a level conversion circuit in the driving circuit, the voltage division circuit enables the voltage of the second end of the first switching tube to be higher than the difference value of the power supply voltage and the divided voltage, and the level conversion circuit is connected with the first switching tube. The level conversion circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit, and the value range of the level value of the converted first clock signal is the range from the power supply voltage to the voltage of the second end of the first switching tube. Therefore, the voltage of the first clock signal is small in voltage division on the energy storage branch where the driving circuit is located, the current of the energy storage branch is reduced, current limiting of the energy storage branch is achieved, the driving circuit is simply changed, current limiting of the charge pump is achieved, normal work of the charge pump is guaranteed under the condition that cost and circuit area are saved, and the service life of the charge pump is prolonged. And the reliability and the safety are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic technology, and in particular to a driving circuit, a charge pump, a chip and an electronic device. Background Art

[0002] A charge pump, also known as a switched capacitor voltage converter, is a DC-DC converter that uses "flying" or "pumping" capacitors to store energy.

[0003] Switching tubes are usually used in charge pumps to control different energy storage branches.

[0004] However, the impedance of the switching tube is usually small, and excessive current may occur in the charge pump, resulting in reduced reliability or even circuit damage. Summary of the invention

[0005] The present disclosure provides a driving circuit, a charge pump, a chip and an electronic device to solve the problem of reduced reliability of a charge pump.

[0006] In a first aspect, the present disclosure provides a driving circuit, which is applied to a charge pump, wherein the charge pump comprises at least two energy storage branches, wherein the output end of the first energy storage branch is connected to the input end of the next energy storage branch; each of the at least two energy storage branches comprises at least one switch tube and a capacitor; the output end of the driving circuit is connected to the control end of at least one switch tube in the first energy storage branch; the at least two energy storage branches comprise the first energy storage branch;

[0007] The driving circuit comprises: a voltage stabilizing diode, a voltage dividing circuit, a current source, a level conversion circuit, a first switch tube, and a second switch tube;

[0008] The input end of the level conversion circuit is used to receive the first clock signal, and the output end of the level conversion circuit is the output end of the driving circuit; the first power supply end of the level conversion circuit is used to receive the power supply voltage, and the second power supply end of the level conversion circuit is connected to the second end of the first switch tube; the control end of the first switch tube is connected to the output end of the voltage divider circuit, the first end of the first switch tube is connected to the second end of the second switch tube, the control end of the second switch tube is connected to the positive electrode of the voltage-regulating diode, and the first end of the second switch tube is grounded; the negative electrode of the voltage-regulating diode is used to receive the power supply voltage, and the positive electrode of the voltage-regulating diode is grounded through the current source; the voltage divider circuit is connected in parallel with the voltage-regulating diode; the voltage divider circuit is used to divide the voltage across the voltage-regulating diode, and output the divided voltage at the output end, so that the voltage at the second end of the first switch tube is higher than the difference between the power supply voltage and the divided voltage;

[0009] The level conversion circuit is used to convert the level value of the first clock signal and output the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal has a value range from the power supply voltage to the voltage of the second end of the first switch tube.

[0010] In some embodiments, the voltage divider circuit includes a first resistor and a second resistor connected in series; the first end of the first resistor is connected to the cathode of the voltage-regulating diode, and the second end of the first resistor is connected to the first end of the second resistor; the second end of the second resistor is connected to the anode of the voltage-regulating diode, and the first end of the second resistor is connected to the control end of the first switching tube.

[0011] In some embodiments, the level conversion circuit includes a level converter and a multi-stage inverter connected in series in sequence; the input end of the level converter is used to receive the first clock signal; the output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the driving circuit.

[0012] The present disclosure provides a driving circuit for a charge pump. In any energy storage branch of the charge pump, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the divided voltage by means of the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit. The voltage-dividing circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, and the divided voltage of the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, thereby reducing the current of the energy storage branch, limiting the current of the energy storage branch of this level, and using the original driving circuit of the charge pump, simply changing the driving circuit to realize current limiting protection of the charge pump, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is ensured while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0013] In a second aspect, the present disclosure provides a charge pump, the charge pump comprising a drive circuit and at least two energy storage branches, the output end of the previous energy storage branch is connected to the input end of the next energy storage branch; each energy storage branch in the at least two energy storage branches comprises at least one switch tube and a capacitor; the output end of the drive circuit is connected to the control end of at least one switch tube in the first energy storage branch; the at least two energy storage branches include the first energy storage branch;

[0014] The driving circuit is the driving circuit as described in the first aspect above.

[0015] In some embodiments, the first-stage energy storage branch includes a third switch tube and a first capacitor; the first end of the third switch tube is used to connect the input voltage; the second end of the third switch tube is connected to the top plate of the first capacitor;

[0016] The driving circuit includes a first driving circuit, an output end of the first driving circuit is connected to a control end of the third switch tube, and a power supply voltage of the first driving circuit comes from a top plate of the first capacitor.

[0017] In some embodiments, the charge pump further includes a third resistor, and the second end of the third switch tube is connected to the top plate of the first capacitor through the third resistor.

[0018] In some embodiments, the second-stage energy storage branch includes a fourth switch tube and a second capacitor; the top plate of the second capacitor is connected to the top plate of the first capacitor through the fourth switch tube;

[0019] The driving circuit includes a second driving circuit, an output end of the second driving circuit is connected to the control end of the fourth switch tube, and a power supply voltage of the second driving circuit comes from a top plate of the second capacitor.

[0020] In some embodiments, the charge pump further includes a fourth resistor, and the second end of the fourth switch tube is connected to the top plate of the second capacitor through the fourth resistor.

[0021] In some embodiments, the second-stage energy storage branch further includes a fifth switch tube; the bottom plate of the second capacitor is connected to the bottom plate of the first capacitor through the fifth switch tube;

[0022] The driving circuit includes a third driving circuit, the output end of the third driving circuit is connected to the control end of the fifth switch tube, and the power supply voltage of the third driving circuit comes from the input voltage.

[0023] In some embodiments, the charge pump further includes a fifth resistor, and the second end of the fifth switch tube is connected to the bottom plate of the second capacitor through the fifth resistor.

[0024] The charge pump provided by the present disclosure, in any one-stage energy storage branch, through the arrangement of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, so that the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, the current of the energy storage branch is reduced, the current of the energy storage branch is limited, the original driving circuit of the charge pump is used, the driving circuit is simply modified, and the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0025] In a third aspect, the present disclosure provides a charge pump, the charge pump further comprising a control circuit; the first-stage energy storage branch comprises a third switch tube, a sixth switch tube, a fifth switch tube, a first capacitor, and a first current output circuit; the control end of the third switch tube, the control end of the first current output circuit, and the control end of the second-stage energy storage branch are electrically connected to the control circuit respectively, the first end of the third switch tube and the second end of the fifth switch tube are both electrically connected to the input voltage, the second end of the third switch tube is electrically connected to the input end of the second-stage energy storage branch, the first end of the first capacitor is electrically connected between the second end of the third switch tube and the input end of the second-stage energy storage branch, the second end of the first capacitor is electrically connected to the first end of the sixth switch tube, the control end of the sixth switch tube is electrically connected to the first end of the first current output circuit, the first end of the fifth switch tube is electrically connected between the second end of the first capacitor and the first end of the sixth switch tube, the second end of the first current output circuit, the second end of the sixth switch tube, and the first end of the second-stage energy storage branch are all grounded, and the output end of the second-stage energy storage branch is used to output the output voltage of the charge pump;

[0026] The control circuit is used to control the first current output circuit to turn on the sixth switch tube according to a first clock signal when the input voltage of the charge pump is less than a first threshold voltage, so as to charge the first capacitor with the input voltage of the charge pump; and control the second-stage energy storage branch to charge with the output voltage of the first-stage energy storage branch according to a second clock signal;

[0027] When the first clock signal is on, the third switch tube is turned on to charge the first capacitor; the second-stage energy storage branch is used to boost the output voltage of the first-stage energy storage branch to obtain the output voltage of the charge pump, and the output voltage of the charge pump is 3 times the input voltage of the charge pump;

[0028] When the second clock signal is on, the fifth switch tube is turned on, so that the first charge pump circuit boosts the input voltage of the multi-stage charge pump to obtain the output voltage of the first charge pump circuit, and the output voltage of the first charge pump circuit is twice the input voltage of the multi-stage charge pump; the second charge pump circuit is used to charge using the output voltage of the first charge pump circuit;

[0029] The first clock signal and the second clock signal are two-phase clocks that do not overlap and have a duty cycle of 50%.

[0030] In some embodiments, the charge pump further includes a third resistor, and the second end of the third switch tube is connected to the top plate of the first capacitor through the third resistor.

[0031] In some embodiments, the second-stage energy storage branch includes a fourth switch tube and a second capacitor; the top plate of the second capacitor is connected to the top plate of the first capacitor through the fourth switch tube;

[0032] The driving circuit includes a second driving circuit, an output end of the second driving circuit is connected to the control end of the fourth switch tube, and a power supply voltage of the second driving circuit comes from a top plate of the second capacitor.

[0033] In some embodiments, the charge pump further includes a fourth resistor, and the second end of the fourth switch tube is connected to the top plate of the second capacitor through the fourth resistor.

[0034] In some embodiments, the second-stage energy storage branch further includes a fifth switch tube; the bottom plate of the second capacitor is connected to the bottom plate of the first capacitor through the fifth switch tube;

[0035] The driving circuit includes a third driving circuit, the output end of the third driving circuit is connected to the control end of the fifth switch tube, and the power supply voltage of the third driving circuit comes from the input voltage.

[0036] In some embodiments, the charge pump further includes a fifth resistor, and the second end of the fifth switch tube is connected to the bottom plate of the second capacitor through the fifth resistor.

[0037] In a fourth aspect, the present disclosure provides a chip, comprising the driving circuit as described in the first aspect above.

[0038] The chip provided by the present disclosure, in any energy storage branch of a charge pump, through the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, so that the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, the current of the energy storage branch is reduced, the current of the energy storage branch is limited, the original driving circuit of the charge pump is used, the driving circuit is simply modified, and the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, and the reliability and safety of the charge pump are improved.

[0039] In a fifth aspect, the present disclosure provides a chip comprising the charge pump as described in the second aspect above.

[0040] In a sixth aspect, the present disclosure provides a chip comprising the charge pump as described in the third aspect above.

[0041] The chip provided by the present disclosure, in any level of energy storage branch, through the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, so that the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, the current of the energy storage branch is reduced, the current of the energy storage branch is limited, the original driving circuit of the charge pump is used, the driving circuit is simply modified, and the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, and the reliability and safety of the charge pump are improved.

[0042] In a seventh aspect, the present disclosure provides an electronic device, comprising the driving circuit as described in the first aspect above.

[0043] The electronic device provided by the present disclosure, in any energy storage branch of a charge pump, through the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, so that the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, the current of the energy storage branch is reduced, the current of the energy storage branch is limited, the original driving circuit of the charge pump is used, the driving circuit is simply modified, and the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, and the reliability and safety of the charge pump are improved.

[0044] In an eighth aspect, the present disclosure provides an electronic device comprising the charge pump as described in the second aspect above.

[0045] In a ninth aspect, the present disclosure provides an electronic device comprising the charge pump as described in the third aspect above.

[0046] The electronic device provided by the present disclosure, in any one-stage energy storage branch, through the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, so that the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, the current of the energy storage branch is reduced, the current of the energy storage branch of this stage is limited, the original driving circuit of the charge pump is used, the driving circuit is simply modified, and the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, and the reliability and safety of the charge pump are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the structure of a charge pump provided by the present disclosure;

[0048] Figure 2 A schematic diagram of the structure of a charge pump provided in an embodiment of the present disclosure;

[0049] Figure 3 A schematic diagram of the structure of another charge pump provided in an embodiment of the present disclosure;

[0050] Figure 4 A schematic diagram of the structure of another charge pump provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0051] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0052] In the present disclosure, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a alone, b alone, or c alone can represent: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure may refer to not only a physical connection, but also an electrical connection or a signal connection. For example, it may be a direct connection, i.e. a physical connection, or it may be an indirect connection through at least one intermediate element, as long as the circuit is connected. It may also be the internal connection of two elements. In addition to signal connection through a circuit, signal connection may also refer to signal connection through a media medium, such as radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure may be understood according to specific circumstances.

[0054] The switch tube in the present disclosure is a three-terminal switch tube, and its three terminals are a control terminal, a first terminal, and a second terminal. The switch tube can be a bipolar switch tube or a field effect switch tube, etc. For example, when the switch tube is a bipolar switch tube, its control terminal refers to the base of the bipolar switch tube, the first terminal can be the collector or emitter of the bipolar switch tube, and the corresponding second terminal can be the emitter or collector of the bipolar switch tube; when the switch tube is a field effect switch tube, its control terminal refers to the gate of the field effect switch tube, the first terminal can be the drain or source of the field effect switch tube, and the corresponding second terminal can be the source or drain of the field effect switch tube.

[0055] Charge pumps usually use a switch network to power or de-power two or more capacitors to perform DC / DC voltage conversion. The basic charge pump switch network constantly switches between two states: powering and de-powering the capacitors.

[0056] Different charge pumps can achieve different proportions of voltage conversion, for example, they can achieve half voltage conversion function, 2 times voltage conversion function, 3 times voltage conversion function, etc. Figure 1 The charge pump with double voltage conversion function is introduced as an example.

[0057] See also Figure 1 , Figure 1 Schematic diagram of a charge pump structure provided by the present disclosure. Figure 1 The charge pump shown includes a switch tube M11, a switch tube M12, a switch tube M13, a switch tube M14, a capacitor C11 and a capacitor C12. Among them, the first-stage energy storage branch includes the switch tube M11, the switch tube M12 and the capacitor C11, and the second-stage energy storage branch includes the switch tube M13, the switch tube M4 and the capacitor C12. In practical applications, the charge pump works in two stages. In the first stage, the switch tube M11 and the switch tube M12 are turned on by the signal PH11 in the first-stage energy storage branch, and the input voltage VCC1 charges the capacitor C11. In the second stage, the switch tubes M11 and M12 in the first energy storage branch are turned off, and the switch tubes M13 and M14 are turned on. The voltage of the input voltage VCC1 can be represented by VCC1. The bottom plate of the capacitor C11 is connected to the input voltage VCC1, and the top plate is connected to the output end of the charge pump. Since the voltage difference on the capacitor cannot change suddenly, the output voltage of the top plate of the capacitor C11 is VCC1+VCC1, which charges the capacitor C12 and outputs the voltage of VCC1+VCC1. That is, the charge pump achieves a 2-fold voltage conversion.

[0058] However, Figure 1 Taking the charge pump shown in the figure as an example, the impedance of the switch tubes in the charge pump is relatively small. When the input voltage VCC1 is suddenly added to the capacitor C11, its peak current can be expressed by the following formula (1).

[0059]

[0060] Among them, I peak is the peak current, C1 is the capacity of capacitor C11, and V is the voltage of the input voltage.

[0061] It can be seen that the voltage of the input voltage is equivalent to a step voltage, and its peak current area is infinite.

[0062] In addition, when the charge pump works normally, only the impedance Ron of the switch tube can be seen in the charge pump circuit. Assuming the voltage of the top plate of capacitor C11 is VC11, the current in the circuit is (VCC1-VC11) / Ron, or the reverse current (VC11-VCC1) / Ron. Since the impedance of the switch tube is small, it can be seen from the above analysis that the peak current is large.

[0063] When the on-chip capacitance is large or an off-chip capacitance is used, the peak current in the charge pump may be large, further leading to problems such as damage to the charge pump circuit and reduced reliability of the charge pump.

[0064] Based on the above technical problems, the present invention provides a driving circuit, a charge pump, a chip and an electronic device. The original driving circuit of the charge pump is utilized and the driving circuit is simply modified to realize current limiting protection for the charge pump, so that the current in the charge pump is controlled below the current limiting value. The normal operation of the charge pump is guaranteed while saving costs and circuit area, thereby improving the reliability and safety of the charge pump.

[0065] The technical solution provided by the present disclosure is described in detail below with specific embodiments.

[0066] An embodiment of the present disclosure provides a charge pump, which includes a drive circuit and at least two energy storage branches, wherein the output end of the previous energy storage branch is connected to the input end of the next energy storage branch; each of the at least two energy storage branches includes at least one switch tube and a capacitor; the output end of the drive circuit is connected to the control end of at least one switch tube in the first energy storage branch; and the at least two energy storage branches include the first energy storage branch.

[0067] Combine the following Figure 2 An exemplary charge pump structure provided by the present disclosure is introduced. It can be understood that: Figure 2 The charge pump in the figure is only an example and does not constitute a limitation of the present disclosure.

[0068] See also Figure 2 , Figure 2 The schematic diagram of the structure of a charge pump provided by the embodiment of the present disclosure is as follows. The driving circuit provided by the embodiment is applied to the charge pump. Figure 2, two-stage energy storage branches are exemplarily shown, namely, a first-stage energy storage branch consisting of a third switch tube M23, a first capacitor C21 and a sixth switch tube M26; and a second-stage energy storage branch consisting of a fourth switch tube M24, a capacitor C22 and a fifth switch tube M25. Figure 2 The structure of the energy storage branch of the charge pump shown in FIG. Figure 1 The structure of the energy storage branch of the charge pump shown in FIG. 1 is similar and will not be repeated here.

[0069] It should be noted that the present disclosure does not limit the type of switch tube involved in the charge pump. Figure 2 The switch tube shown as an example is a field effect switch tube.

[0070] The output end of the first drive circuit 211 is connected to the control end of at least one switch tube in the first energy storage branch. The first drive circuit 211 is used to control the switch tube in the energy storage branch to turn the switch tube on or off, thereby charging or discharging the capacitor in the energy storage branch. Figure 2 exemplarily shows the structure of the first driving circuit 211 arranged in the first-stage energy storage branch of the charge pump.

[0071] Combine the following Figure 2 The structure of the first driving circuit provided by the embodiment of the present disclosure is introduced. The first driving circuit provided by the embodiment includes: a first voltage zener diode DZ1, a first voltage divider circuit 212, a first current source I, a first level conversion circuit 211, a first switch tube M21, and a second switch tube M22.

[0072] The input end of the first level conversion circuit 211 is used to receive the first clock signal PH21, and the output end of the first level conversion circuit 211 is the output end of the first driving circuit 211. The output end of the first level conversion circuit 211 is connected to the control end of the switch tube. Figure 2 FIG. 2 exemplarily shows that the first level conversion circuit 211 is connected to the control end of the third switch tube M23 .

[0073] The first power supply terminal of the first level conversion circuit 211 is used to receive a first power supply voltage. Figure 2 The first supply voltage shown in FIG. 1 is the voltage VC21 of the top plate of the capacitor C21. The first supply voltage may be a first supply voltage from other sources, which is not limited in the present disclosure.

[0074] The second power supply terminal of the first level conversion circuit 200 is connected to the second end of the first switch tube M21 .

[0075] The first level conversion circuit 211 is used to convert the first clock signal PH21 received at the input end into a signal with a voltage range from the voltage received at the second power supply end to the voltage received at the first power supply end, and output the converted voltage signal from the output end of the first level conversion circuit 211.

[0076] The output end of the first level conversion circuit 211 is connected to the control end of the switch tube as the output end of the first driving circuit 211. Figure 2 As shown, the output end of the first level conversion circuit 211 is connected to the control end of the third switch tube M23. Since the third switch tube M23 is located in the branch where the input voltage is connected to the capacitor C21, the switch tube M23 is a high-voltage tube. The first clock signal PH21 is a low-voltage signal. Therefore, the first level conversion circuit 211 is required to convert the low-voltage first clock signal PH21 into a relatively high-voltage signal, so as to drive the third switch tube M23.

[0077] Further, the first level conversion circuit 211 includes a first level converter and a multi-stage inverter connected in series. The input end of the first level converter is used to receive the first clock signal. The output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the first driving circuit. The first level converter is used to convert the level value of the first clock signal and output the converted first clock signal at the output end of the level conversion circuit. The multi-stage inverter connected in series can be used to enhance the signal strength and maintain the signal integrity. For example, please continue to refer to Figure 2 , Figure 2 , two-stage inverters are exemplarily shown, namely a first inverter and a second inverter, wherein the input end of the first inverter is connected to the output end of the first level converter, the output end of the first inverter is connected to the input end of the second inverter, and the output end of the second inverter is the output end of the first driving circuit.

[0078] The control end of the first switch tube M21 is connected to the output end of the first voltage divider circuit 212, the first end of the first switch tube M21 is connected to the second end of the second switch tube M22, the control end of the second switch tube M22 is connected to the anode of the first voltage regulator diode DZ1, and the first end of the second switch tube M22 is grounded.

[0079] Further, the first switch tube M21 can be a positive channel Metal Oxide Semiconductor field effect switch tube (PMOS), and accordingly, the control end of the first switch tube M21 is the gate of the first switch tube M21, the first end of the first switch tube M21 is the source of the first switch tube M21, and the second end of the first switch tube M21 is the drain of the first switch tube M21.

[0080] Further, the second switch tube M22 may be a PMOS. Accordingly, the control end of the second switch tube M22 is the gate of the second switch tube M22, the first end of the second switch tube M22 is the source of the second switch tube M22, and the second end of the second switch tube M22 is the drain of the second switch tube M22.

[0081] The cathode of the first voltage stabilizing diode DZ1 is used to receive the first supply voltage. The anode of the first voltage stabilizing diode DZ1 is grounded through the first current source I.

[0082] The first power supply voltage received by the cathode of the first voltage zener diode DZ1 is the same as the first power supply voltage received by the first power supply terminal of the first level conversion circuit 211 .

[0083] The first voltage divider circuit 212 is connected in parallel with the first voltage zener diode DZ1. The first voltage divider circuit 212 is used to divide the voltage across the first voltage zener diode DZ1 and output the divided voltage at the output end so that the voltage at the second end of the first switch tube M21 is higher than the difference between the power supply voltage and the divided voltage;

[0084] The level conversion circuit 211 is used to convert the level value of the first clock signal and output the converted first clock signal at the output end of the level conversion circuit.

[0085] The level value of the converted first clock signal has a value range from the power supply voltage to the voltage of the second end of the first switch tube M21.

[0086] Furthermore, the first voltage divider circuit 212 may be implemented by connecting resistors in series, such as Figure 2 As shown, the first voltage divider circuit 212 includes a first resistor R1 and a second resistor R2 connected in series. The first end of the first resistor R1 is connected to the cathode of the first voltage zener diode DZ1, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the second end of the second resistor R2 is connected to the anode of the first voltage zener diode DZ1, and the first end of the second resistor R2 is connected to the control end of the first switch tube M21.

[0087] In a possible design, the charge pump further includes a third resistor R3, and the second end of the third switch tube M23 is connected to the top plate of the first capacitor C21 through the third resistor R3.

[0088] In this embodiment, the third resistor R3 is used to limit the current. When the input voltage VCC is powered on, the peak current is VCC / R3, thereby achieving the function of current limiting when powered on.

[0089] In practical applications, it is assumed that the source voltage of the second switch tube M22 is represented by HVSS. If the first switch tube M21 is not provided in the first driving circuit, in order to ensure that HVSS can follow the transient jump of VCC, when the charge pump is working normally, the HVSS voltage can be generated by the clamping structure of the first voltage stabilizing diode DZ1, and HVSS is output at the output end of the first level conversion circuit 211. The current limiting values ​​of the forward current and the reverse current of the first-stage energy storage branch are approximately (VC21-HVSS) / R, wherein it is assumed that the gate-source voltage of the third switch tube M23 is represented by VGS_M23, and R is the sum of the resistance value of the third resistor R3 and the gate-source impedance of the third switch tube M23. Since VGS_M23 is small when the charge pump is working, VGS_M23 is ignored here for the sake of simplicity of analysis.

[0090] Furthermore, the first voltage stabilizing diode DZ1 may be a device with a voltage drop of about 6 V. The following analysis is explained by taking the voltage drop of the first voltage stabilizing diode DZ1 as 6 V as an example, which is understandable and does not constitute a limitation to the present disclosure.

[0091] Assuming that the gate-source voltage of the second switch tube is represented by VSG_M22, HVSS is VC21-6+VSG_M22. Since the voltage drop of the first voltage zener diode DZ1 is 6V, HVSS is relatively small. From the above current calculation formula (VC21-HVSS) / R, it can be seen that the current is still relatively large.

[0092] On the basis of the above circuit structure, the first switch tube M21 and the first voltage divider circuit 212 are added to the first driving circuit 211, and the gate bias voltage of the first switch tube M21 is obtained by the first voltage divider circuit 212 dividing the first voltage zener diode DZ1, and the voltage divider ratio of the first voltage divider circuit 212 can be set according to the current limiting value. Assuming that the voltage divider voltage of the first voltage divider circuit 212 is represented by VR, the gate bias voltage of the first switch tube M21 is VC21-VR, and the source voltage HVS of the first switch tube M21 is VC21-3V+VSG_M21, the current of the current first-stage energy storage branch can be approximately expressed as (VC21-HVS) / R3. It can be understood that HVS is larger than HVSS, so the current limiting value of the first-stage energy storage branch can be controlled to a smaller range.

[0093] Exemplarily, when the resistance values ​​of the first resistor and the second resistor in the first voltage divider circuit 212 are equal, that is, R1=R2, and the voltage divider ratio is 1 / 2, the voltage divider voltage VR=1 / 2*6V=3V. The gate bias voltage of the first switch tube M21 is VC21-VR=VC21-3V, the source voltage HVS of the first switch tube M21 is HVS=VC21-3V+VSG_M21, and HVS is output at the output end of the first level conversion circuit 211. At this time, the current limiting current value in the charge pump is approximately (VC21-HVS) / R3.

[0094] At the same time, since the first voltage stabilizing diode DZ1 exists in the first driving circuit, the first driving circuit can also work normally when there is a drastic transient jump in the power supply, thereby limiting the current of the charge pump.

[0095] In addition, the gate-source impedance of the third switch tube M23 is a variable quantity, which changes with the change of VGS_M23, and is approximately inversely proportional to VGS_M23. The larger the HVS voltage is, the smaller the VGS_M23 is, and the larger the gate-source impedance of the corresponding third switch tube M23 is. At this time, the efficiency of the charge pump is lower. Therefore, if the HVS is large, it may affect the efficiency of the charge pump when it works normally. Therefore, the voltage divider ratio in the first voltage divider circuit 212 can be set accordingly, and the voltage of the HVS can be adjusted to balance the efficiency of the charge pump and the reliability of the current limiting protection.

[0096] The present embodiment provides a driving circuit for a charge pump. In any energy storage branch of the charge pump, through the arrangement of a voltage stabilizing diode, a voltage divider circuit, a switch tube and a level conversion circuit in the driving circuit, the voltage divider circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage divider voltage. The level conversion circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, and the voltage divider of the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, thereby reducing the current of the energy storage branch and limiting the current of the energy storage branch of this level. The original driving circuit of the charge pump is used and the driving circuit is simply modified to realize current limiting protection of the charge pump, so that the current in the charge pump is controlled below the current limiting value. While saving cost and circuit area, the normal operation of the charge pump is guaranteed, and the reliability and safety of the charge pump are improved.

[0097] In some embodiments, the embodiments of the present disclosure provide a charge pump. The charge pump includes a drive circuit and at least two energy storage branches, the output end of the first energy storage branch is connected to the input end of the next energy storage branch; each of the at least two energy storage branches includes at least one switch tube and a capacitor; the output end of the drive circuit is connected to the control end of at least one switch tube in the first energy storage branch; the at least two energy storage branches include a first energy storage branch.

[0098] The driving circuit is the driving circuit in any of the above embodiments.

[0099] The implementation principle of the charge pump in this embodiment is similar to that in the above embodiment and will not be described again here.

[0100] The charge pump provided in the present embodiment, in any one-stage energy storage branch, through the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, so that the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, the current of the energy storage branch is reduced, the current of the energy storage branch is limited, and the original driving circuit of the charge pump is used to make a simple change to the driving circuit to realize current limiting protection of the charge pump, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0101] It should be noted that the specific structure of the charge pump provided in the present disclosure can be the above Figure 2 The charge pump shown in the figure may also be a charge pump of other structures, which is not limited in the present disclosure. Figure 2 The charge pump structure shown is taken as an example to illustrate the driving circuit in the charge pump.

[0102] In some embodiments, Figure 2 Take the charge pump shown in the figure as an example. When the charge pump is working normally, the current direction is from left to right, which is a positive current. When the charge pump is working abnormally, the current direction may be from right to left, so current limiting can be performed in both directions. The following introduces the structure of the specific drive circuit for current limiting the charge pump.

[0103] In one possible design, please refer to Figure 2 The first energy storage branch includes a third switch tube M23 and a first capacitor C21. The first end of the third switch tube M23 is used to connect the input voltage VCC. The second end of the third switch tube M23 is connected to the top plate of the first capacitor C21. Figure 2 exemplarily shows that the driving circuit 200 is arranged in the first-stage energy storage circuit.

[0104] The driving circuit includes a first driving circuit 211, the output end of the first driving circuit 211 is connected to the control end of the third switch tube M23, and the first power supply voltage of the first driving circuit 211 comes from the top plate of the first capacitor C21. The first driving circuit 211 includes: a first voltage zener diode DZ1, a first voltage divider circuit 212, a first current source I, a first level conversion circuit 211, a first switch tube M21, and a second switch tube M22.

[0105] The control end of the first switch tube M21 is connected to the output end of the first voltage divider circuit 212, the first end of the first switch tube M21 is connected to the second end of the second switch tube M22, the control end of the second switch tube M22 is connected to the anode of the first voltage regulator diode DZ1, and the first end of the second switch tube M22 is grounded.

[0106] The cathode of the first voltage stabilizing diode DZ1 is used to receive the first supply voltage. The anode of the first voltage stabilizing diode DZ1 is grounded through the first current source I.

[0107] The first voltage divider circuit 212 is connected in parallel with the first voltage zener diode DZ1. The first voltage divider circuit 212 is used to divide the voltage across the first voltage zener diode DZ1 and output a first divided voltage at the output end so that the voltage at the second end of the first switch tube is higher than the difference between the first power supply voltage and the first divided voltage.

[0108] Furthermore, the first voltage divider circuit 212 includes a first resistor R1 and a second resistor R2 connected in series. The first end of the first resistor R1 is connected to the cathode of the first voltage zener diode DZ1, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the second end of the second resistor R2 is connected to the anode of the first voltage zener diode DZ1, and the first end of the second resistor R2 is connected to the control end of the first switch tube M21.

[0109] The input end of the first level conversion circuit 211 is used to receive the first clock signal PH21, and the output end of the first level conversion circuit 211 is the output end of the driving circuit 200. The output end of the first level conversion circuit 211 is connected to the control end of the third switch tube M23.

[0110] The first power supply terminal of the first level conversion circuit 211 is used to receive the first power supply voltage. The second power supply terminal of the first level conversion circuit 200 is connected to the second terminal of the first switch tube M21.

[0111] The level conversion circuit is used to convert the level value of the first clock signal PH21, and output the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal has a value range from the first power supply voltage to the voltage of the second end of the first switch tube.

[0112] Further, the first level conversion circuit 211 includes a first level converter and a multi-stage inverter connected in series. The input end of the first level converter is used to receive the first clock signal. The output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the first driving circuit. For example, please continue to refer to Figure 2 , Figure 2, two-stage inverters are exemplarily shown, namely a first inverter and a second inverter, wherein the input end of the first inverter is connected to the output end of the first level converter, the output end of the first inverter is connected to the input end of the second inverter, and the output end of the second inverter is the output end of the first driving circuit.

[0113] In a possible design, the charge pump further includes a third resistor R3, and the second end of the third switch tube M23 is connected to the top plate of the first capacitor C21 through the third resistor R3.

[0114] The implementation principle of the first driving circuit of this embodiment is similar to that of the above embodiment and will not be described again here.

[0115] The charge pump provided in the present embodiment has a first-stage energy storage branch. Through the arrangement of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage. The level conversion circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal has a value range from the power supply voltage to the voltage at the second end of the first switch tube, thereby making the output end voltage of the level conversion circuit larger, making the voltage division of the first clock signal on the energy storage branch where the driving circuit is located smaller, reducing the current of the energy storage branch, limiting the current of the energy storage branch at this stage, using the original driving circuit of the charge pump, making a simple change to the driving circuit, realizing current limiting protection of the charge pump, making the current in the charge pump controlled below the current limiting value, ensuring the normal operation of the charge pump while saving cost and circuit area, and improving the reliability and safety of the charge pump.

[0116] In one possible design, please refer to Figure 2 The charge pump further includes a third resistor R3, and the second end of the third switch tube M23 is connected to the top plate of the first capacitor C21 through the third resistor R3.

[0117] In practical applications, the first-stage energy storage branch in the charge pump is current limited by the third resistor R3. When the input voltage VCC is powered on, the peak current is VCC / R3, thereby playing a role of current limiting when powered on.

[0118] The charge pump provided in this embodiment plays a current limiting role when power is turned on by adding a resistor in the first-stage energy storage branch. When the charge pump works normally, the current is approximately the converted control voltage divided by the third resistor, which also plays a current limiting role on the first-stage energy storage branch, thereby ensuring the normal operation of the charge pump and improving the reliability and safety of the charge pump.

[0119] In one possible design, please refer to Figure 2 The second energy storage branch includes a fourth switch tube M24 and a second capacitor C22. The top plate of the second capacitor C22 is connected to the top plate of the first capacitor C21 through the fourth switch tube M24.

[0120] The driving circuit provided in this embodiment includes a second driving circuit 212, the output end of the second driving circuit 212 is connected to the control end of the fourth switch tube M24, and the second power supply voltage of the second driving circuit comes from the top plate of the second capacitor C22.

[0121] The second driving circuit 212 includes: a second voltage stabilizing diode, a second voltage divider circuit, a second current source, a second level conversion circuit, a seventh switch tube, and an eighth switch tube.

[0122] The control end of the seventh switch tube is connected to the output end of the second voltage divider circuit, the first end of the seventh switch tube is connected to the second end of the eighth switch tube, the control end of the eighth switch tube is connected to the anode of the second voltage regulator diode, and the first end of the eighth switch tube is grounded.

[0123] The cathode of the second voltage stabilizing diode is used to receive the second power supply voltage VCC+VCC. The anode of the second voltage stabilizing diode is grounded through the second current source.

[0124] The second voltage divider circuit is connected in parallel with the second voltage zener diode. The second voltage divider circuit is used to divide the voltage across the second voltage zener diode and output the second divided voltage at the output end, so that the voltage at the second end of the seventh switch tube is higher than the difference between the second power supply voltage and the second divided voltage;

[0125] Furthermore, the second voltage divider circuit includes a sixth resistor and a seventh resistor connected in series. The first end of the sixth resistor is connected to the cathode of the second voltage zener diode, the second end of the sixth resistor is connected to the first end of the seventh resistor; the second end of the seventh resistor is connected to the anode of the second voltage zener diode, and the first end of the seventh resistor is connected to the control end of the seventh switch tube.

[0126] The input end of the second level conversion circuit is used to receive the second clock signal PH22, and the output end of the second level conversion circuit is the output end of the second driving circuit 212. The output end of the second level conversion circuit is connected to the control end of the fourth switch tube M24.

[0127] The first power supply terminal of the second level conversion circuit is used to receive the second power supply voltage. The second power supply terminal of the second level conversion circuit is connected to the second terminal of the seventh switch tube.

[0128] The second level conversion circuit is used to convert the level value of the second clock signal PH22, and output the converted second first clock signal at the output end of the second level conversion circuit. The level value of the converted second first clock signal ranges from the second power supply voltage to the voltage of the second end of the seventh switch tube.

[0129] Further, the second level conversion circuit includes a second level converter and a multi-stage inverter connected in series. The input end of the second level converter is used to receive the first clock signal. The output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the second driving circuit. For example, please continue to refer to Figure 2 , Figure 2 , two-stage inverters are exemplarily shown, namely the third inverter and the fourth inverter, wherein the input end of the third inverter is connected to the output end of the second level converter, the output end of the third inverter is connected to the input end of the fourth inverter, and the output end of the fourth inverter is the output end of the second driving circuit.

[0130] The implementation principle of the second driving circuit of this embodiment is similar to that of the first driving circuit in the above embodiment, and will not be described again here.

[0131] The charge pump provided in the present embodiment has a second-stage energy storage branch. Through the arrangement of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage. The level conversion circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, thereby making the output end voltage of the level conversion circuit larger, making the voltage division of the first clock signal on the energy storage branch where the driving circuit is located smaller, reducing the current of the energy storage branch, limiting the current of the energy storage branch at this stage, using the original driving circuit of the charge pump, making a simple change to the driving circuit, realizing current limiting protection of the charge pump, so that the current in the charge pump is controlled below the current limiting value, and ensuring the normal operation of the charge pump while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0132] Furthermore, the charge pump further includes a fourth resistor R4, and the second end of the fourth switch tube M24 is connected to the top plate of the second capacitor C22 through the fourth resistor R4.

[0133] In practical applications, the second-stage energy storage branch in the charge pump is current limited by the fourth resistor R4. When the input voltage 2VCC is powered on, the peak current is 2VCC / R4, thereby playing a role of current limiting when powered on.

[0134] The charge pump provided in this embodiment plays a current limiting role when power is turned on by adding a resistor in the second-stage energy storage branch. When the charge pump works normally, the current is approximately the converted control voltage divided by the fourth resistor, which also plays a current limiting role on the second-stage energy storage branch, thereby ensuring the normal operation of the charge pump and improving the reliability and safety of the charge pump.

[0135] In one possible design, please refer to Figure 2 The second energy storage branch further includes a fifth switch tube M25. The bottom plate of the second capacitor C22 is connected to the bottom plate of the first capacitor C21 through the fifth switch tube M25.

[0136] The driving circuit provided in this embodiment includes a third driving circuit 230 , the output end of the third driving circuit 230 is connected to the control end of the fifth switch tube M25 , and the third power supply voltage of the third driving circuit 230 comes from the input voltage.

[0137] The third driving circuit 230 includes: a third voltage stabilizing diode, a third voltage dividing circuit, a third current source, a third level conversion circuit, a ninth switch tube, and a tenth switch tube.

[0138] The control end of the ninth switch tube is connected to the output end of the third voltage divider circuit, the first end of the ninth switch tube is connected to the second end of the tenth switch tube, the control end of the tenth switch tube is connected to the anode of the third voltage regulator diode, and the first end of the tenth switch tube is grounded.

[0139] The cathode of the third voltage stabilizing diode is used to receive the third power supply voltage VCC. The anode of the third voltage stabilizing diode is grounded through the third current source.

[0140] The third voltage-dividing circuit is connected in parallel with the third voltage-stabilizing diode. The third voltage-dividing circuit is used to divide the voltage across the third voltage-stabilizing diode and output the third divided voltage at the output end, so that the voltage at the second end of the ninth switch tube is higher than the difference between the third power supply voltage and the third divided voltage;

[0141] Furthermore, the third voltage divider circuit includes an eighth resistor and a ninth resistor connected in series. The first end of the eighth resistor is connected to the cathode of the third voltage zener diode, the second end of the eighth resistor is connected to the first end of the ninth resistor; the second end of the ninth resistor is connected to the anode of the third voltage zener diode, and the first end of the ninth resistor is connected to the control end of the ninth switch tube.

[0142] The input end of the third level conversion circuit is used to receive the second clock signal PH22, and the output end of the third level conversion circuit is the output end of the third driving circuit 230. The output end of the third level conversion circuit is connected to the control end of the fifth switch tube M25.

[0143] The first power supply terminal of the third level conversion circuit is used to receive the third power supply voltage. The second power supply terminal of the third level conversion circuit is connected to the second terminal of the ninth switch tube.

[0144] Further, the third level conversion circuit includes a third level converter and a multi-stage inverter connected in series. The input end of the third level converter is used to receive the first clock signal. The output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the third driving circuit. For example, please continue to refer to Figure 2 , Figure 2 , two-stage inverters are exemplarily shown, namely the fifth inverter and the sixth inverter, wherein the input end of the fifth inverter is connected to the output end of the third level converter, the output end of the fifth inverter is connected to the input end of the sixth inverter, and the output end of the sixth inverter is the output end of the third driving circuit.

[0145] The level conversion circuit is used to convert the level value of the second clock signal PH22, and output the converted third first clock signal at the output end of the level conversion circuit. The level value of the converted third first clock signal ranges from the third power supply voltage to the voltage of the second end of the ninth switch tube.

[0146] The implementation principle of the third driving circuit of this embodiment is similar to that of the first driving circuit in the above embodiment, and will not be described again here.

[0147] The charge pump provided in the present embodiment, in the second-stage energy storage branch, makes the resistance voltage division of the energy storage branch where the drive circuit is located smaller by setting the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the drive circuit, thereby controlling the current of the energy storage branch and limiting the current of the energy storage branch of this stage. By using the original drive circuit of the charge pump and making simple changes to the drive circuit, the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0148] Furthermore, the charge pump further includes a fifth resistor R5, and the second end of the fifth switch tube M25 is connected to the bottom plate of the second capacitor C21 through the fifth resistor R5.

[0149] In practical applications, the second-stage energy storage branch in the charge pump is current limited by the fifth resistor R5. When the input voltage VCC is powered on, the peak current is VCC / R5, thereby playing a role of current limiting when powered on.

[0150] The charge pump provided in this embodiment plays a current limiting role when power is turned on by adding a resistor in the second-stage energy storage branch. When the charge pump works normally, the current is approximately the converted control voltage divided by the fifth resistor, which also plays a current limiting role on the second-stage energy storage branch, thereby ensuring the normal operation of the charge pump and improving the reliability and safety of the charge pump.

[0151] It should be noted that in the charge pump, the driving circuit can be set at any position in the above-mentioned possible design mode, and can also be set at the positions corresponding to the switch tubes of two or more energy storage branches at the same time. The present disclosure does not limit the number of driving circuits set in the charge pump. Figure 2 In the charge pump shown, driving circuits may be respectively provided on the branches of the third switch tube M23, the fourth switch tube M24 and the fifth switch tube M25, so as to limit the current of the charge pump.

[0152] Combine the following Figure 3 Another charge pump structure provided by the present disclosure is exemplarily introduced. It can be understood that: Figure 3 The charge pump in the embodiment is only an example and does not constitute a limitation of the present disclosure. The driving circuit provided in this embodiment can be applied to the charge pump. The charge pump provided in this embodiment may include: a first-stage energy storage branch, a second-stage energy storage branch, and a driving circuit. It should be noted that the present disclosure does not limit the type of switch tube involved in the charge pump provided in this embodiment. Figure 3 The switch tube shown as an example is a field effect switch tube.

[0153] Figure 3 , a two-stage energy storage branch is exemplarily shown, wherein the first-stage energy storage branch includes a third switch tube M33 , a sixth switch tube M36 , a fifth switch tube M35 , a first capacitor C31 and a first current output circuit 320 .

[0154] The control end of the third switch tube M33, the control end of the first current output circuit 320 and the control end of the second energy storage branch are electrically connected to the control circuit 330 respectively. The first end of the third switch tube M33 and the second end of the fifth switch tube M35 are both electrically connected to the input voltage VS2 of the charge pump. The second end of the third switch tube M33 is electrically connected to the input end of the second energy storage branch. The first end of the first capacitor C31 is electrically connected between the second end of the third switch tube M33 and the input end of the second energy storage branch. The second end of the first capacitor C31 is electrically connected to the first end of the sixth switch tube M36. The control end of the sixth switch tube M36 is electrically connected to the first end of the first current output circuit 320. The first end of the fifth switch tube M35 is electrically connected between the second end of the first capacitor C31 and the first end of the sixth switch tube M36. The second end of the first current output circuit 320, the second end of the sixth switch tube M36 and the first end of the second energy storage branch are all grounded. The output end of the second energy storage branch is used to output the output voltage VO2 of the charge pump.

[0155] The first-stage energy storage branch, the second-stage energy storage branch and the control circuit 330 may be arranged separately or integrated.

[0156] The first clock signal PH31 and the second clock signal PH32 are two-phase clocks that do not overlap and have a duty cycle of 50%. The charge pump is controlled by the first clock signal PH31 and the second clock signal PH32, that is, each switch in the first energy storage branch and the second energy storage branch is alternately turned on with a duty cycle of 50%.

[0157] When the first clock signal is PH31, the first energy storage branch is in the charging stage, and the second energy storage branch is in the discharging stage. When the second clock signal is PH32, the first energy storage branch is in the discharging stage, and the second energy storage branch is in the charging stage.

[0158] In the case where the input voltage VS2 of the charge pump is less than the first threshold voltage, that is, in the case where the input voltage VS2 of the charge pump is relatively small, when the first clock signal PH31 is on, the control circuit 330 can control the first current output circuit 320 to be turned on, so that the sixth switch tube M36 is turned on. In this way, when the first clock signal PH31 is on, the third switch tube M33 is turned on, so that the input voltage VS2 of the charge pump can charge the first capacitor C31, so that the first-stage energy storage branch is in the charging stage. Furthermore, the first-stage energy storage branch can charge the first capacitor C31 using the input voltage VS2 of the charge pump. When the second clock signal PH32 is on, the control circuit 330 can control the second-stage energy storage branch to use the output voltage of the first-stage energy storage branch, that is, the voltage of the first end of the first capacitor C31 to enter charging, so that the second-stage energy storage branch is in the charging stage.

[0159] When the first clock signal PH31 is on, the sixth switch tube M36 and the third switch tube M33 are both in the on state. Therefore, the input voltage VS2 of the charge pump can charge the first capacitor C31, so that the voltage stored on the first capacitor C31 can be the input voltage VS2 of the charge pump at most. At the same time, the second-stage energy storage branch is in the discharge stage, and the second-stage energy storage branch can boost the output voltage of the first-stage energy storage branch to obtain the output voltage VO2 of the charge pump. Since the output voltage of the first-stage energy storage branch is 2 times the input voltage VS2 of the charge pump. Therefore, the output voltage VO2 of the charge pump is 3 times the input voltage VS2 of the charge pump.

[0160] When the second clock signal PH32 is on, the first-stage energy storage branch is in the discharge stage, and the fifth switch tube M35 is turned on, so that the first-stage energy storage branch boosts the input voltage VS2 of the charge pump to obtain the output voltage of the first-stage energy storage branch, that is, the voltage of the first end of the first capacitor C31. Since the voltage stored on the first capacitor C31 can be the input voltage VS2 of the charge pump at the highest, and the second end of the fifth switch tube M35 is electrically connected to the input voltage VS2 of the charge pump. Therefore, the voltage at the first end of the first capacitor C31 can be up to 2 times the input voltage VS2 of the charge pump. At the same time, the second-stage energy storage branch is in the charging stage, and the second-stage energy storage branch can be charged using the output voltage of the first-stage energy storage branch 100, that is, the voltage of the first end of the first capacitor C31.

[0161] like Figure 3 As shown, the driving circuit includes a fourth driving circuit 310. This embodiment exemplarily shows that the fourth driving circuit 310 is set on the first-stage energy storage branch. The fourth driving circuit 310 includes: a voltage stabilizing diode DZ31, a voltage dividing circuit 312, a current source, a level conversion circuit 311, a first switch tube M31, a second switch tube M32 and a control circuit 313.

[0162] The input end of the level conversion circuit 311 is used to receive the first clock signal PH31, and the output end of the level conversion circuit 311 is the output end of the fourth driving circuit 310. The first power supply end of the level conversion circuit 311 is used to receive the power supply voltage, and the second power supply end of the level conversion circuit 311 is connected to the second end of the first switch tube M31. The control end of the first switch tube M31 is connected to the output end of the voltage divider circuit 312, the first end of the first switch tube M31 is connected to the second end of the second switch tube M32, the control end of the second switch tube M32 is connected to the positive electrode of the voltage zener diode DZ31, and the first end of the second switch tube M32 is grounded. The cathode of the voltage zener diode DZ31 is used to receive the power supply voltage, and the positive electrode of the voltage zener diode DZ31 is grounded through the current source; the voltage divider circuit 312 is connected in parallel with the voltage zener diode DZ31.

[0163] The voltage divider circuit 312 is used to divide the voltage across the voltage zener diode DZ31 and output the divided voltage at the output end, so that the voltage at the second end of the first switch tube M31 is higher than the difference between the power supply voltage and the divided voltage.

[0164] The level conversion circuit 311 is used to convert the level value of the first clock signal PH31, and output the converted first clock signal at the output end of the level conversion circuit 311. The level value of the converted first clock signal ranges from the power supply voltage to the voltage of the second end of the first switch tube M31.

[0165] The implementation principle of the fourth driving circuit 310 is similar to the implementation principle of the first driving circuit described above, and will not be described in detail here.

[0166] The charge pump provided in this embodiment, when the input voltage of the charge pump is less than the first threshold voltage, the control circuit can control the first current output circuit to turn on the sixth switch tube according to the first clock signal, so that the first-level energy storage branch uses the input voltage of the charge pump to charge the first capacitor, so that the first-level energy storage branch can boost the input voltage of the charge pump. In addition, the control circuit can control the second-level energy storage branch to use the output voltage of the first-level energy storage branch to enter charging according to the second clock signal, so that the second-level energy storage branch can boost the output voltage of the first-level energy storage branch. In this way, when the first clock signal is on, the first-level energy storage branch can charge the first capacitor with the input voltage of the charge pump, and the second-level energy storage branch can boost the output voltage of the first-level energy storage branch to obtain the output voltage of the charge pump circuit. When the second clock signal is on, the first-level energy storage branch can boost the input voltage of the charge pump to obtain the output voltage of the first-level energy storage branch. The second-level energy storage branch can charge with the output voltage of the first-level energy storage branch. Since the output voltage of the first-stage energy storage branch is twice the input voltage of the charge pump, the output voltage of the charge pump obtained by the second-stage energy storage branch is three times the input voltage of the charge pump. Thus, the charge pump can raise the output voltage of the charge pump to three times the input voltage of the charge pump, so that the high-side switch driving circuit can meet the driving requirements of the high-side switch under the action of the output voltage of the charge pump. In any energy storage branch of the charge pump structure, through the setting of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage, the level conversion circuit converts the level value of the first clock signal, and outputs the converted first clock signal at the output end of the level conversion circuit, and the level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, so that the output end voltage of the level conversion circuit is larger, and the voltage division of the voltage of the first clock signal on the energy storage branch where the driving circuit is located is smaller, thereby reducing the current of the energy storage branch, limiting the current of this level of energy storage branch, using the original driving circuit of the charge pump, and making simple changes to the driving circuit to achieve current limiting protection for the charge pump, so that the current in the charge pump is controlled below the current limiting value, while saving costs and circuit area, ensuring the normal operation of the charge pump, and improving the reliability and safety of the charge pump.

[0167] In some examples, when the input voltage VS2 of the charge pump is greater than the first threshold voltage, that is, when the input voltage VS2 of the charge pump is large, whether when the first clock signal PH31 or when the second clock signal PH32 is, the control circuit 330 can control the third switch tube M33 to always be turned on, and control the first current output circuit 320 to always be turned off, so that the first-stage energy storage branch does not work. In this way, the power consumption of the first-stage energy storage branch can be saved. In addition, the control circuit 330 can control the second-stage energy storage branch to charge with the input voltage VS2 of the charge pump according to the second clock signal PH32. Thus, when the input voltage VS2 of the charge pump is greater than the first threshold voltage, the power consumption of the charge pump is reduced.

[0168] When the first clock signal PH31 is on, the second energy storage branch is in the discharge stage, and the second energy storage branch can boost the input voltage VS2 of the charge pump to obtain the output voltage VO2 of the charge pump. The output voltage VO2 of the charge pump is twice the input voltage VS2 of the charge pump.

[0169] When the second clock signal PH32 is on, the fifth switch tube M35 is turned on, and the second energy storage branch is in the charging stage, so that the second energy storage branch can be charged by using the input voltage VS2 of the charge pump, that is, the voltage of the first end of the first capacitor C31. Since the voltage stored on the first capacitor C31 is 0, and the second end of the fifth switch tube M35 is electrically connected to the input voltage VS2 of the charge pump. Therefore, the voltage of the first end of the first capacitor C31 is at most the input voltage VS2 of the charge pump.

[0170] In summary, when the charge pump input voltage is greater than the first threshold voltage, the control circuit can control the fifth switch tube to be always turned on, and control the first current output circuit to be always turned off, so that the first-stage energy storage branch does not work, saving the power consumption of the first-stage energy storage branch. In addition, the control circuit can control the second-stage energy storage branch to charge with the input voltage of the charge pump according to the second clock signal, so that the second-stage energy storage branch is in the charging stage. Thus, the power consumption of the charge pump can be reduced.

[0171] Based on the description of the above embodiment, a possible implementation of the second-level energy storage branch is exemplified. Figure 4 , Figure 4 A schematic diagram of the structure of another charge pump provided in an embodiment of the present disclosure, Figure 4 is Figure 3 Based on the charge pump shown in the figure, the Figure 3 The structure of the charge pump. Figure 4As shown, the second-stage energy storage branch may include: a fourth switch tube M34 , a seventh switch tube M37 , a ninth switch tube M39 , an eighth switch tube M38 , a second capacitor C32 , a third capacitor C33 and a second current output circuit 340 .

[0172] The control end of the second current output circuit 340 is electrically connected to the control circuit 330, the first end of the fourth switch tube M34 is electrically connected to the second end of the third switch tube M33, the second end of the fourth switch tube M34 is electrically connected to the first end of the seventh switch tube M37, the second end of the seventh switch tube M37 is electrically connected to the first end of the second capacitor C32, the first end of the third capacitor C33 is electrically connected between the second end of the fourth switch tube M34 and the first end of the seventh switch tube M37, the second end of the third capacitor C33 is electrically connected to the first end of the ninth switch tube M39, the control end of the ninth switch tube M39 is electrically connected to the first end of the second current output circuit 340, the first end of the eighth switch tube M38 is electrically connected between the second end of the third capacitor C33 and the first end of the ninth switch tube M39, the second end of the eighth switch tube M38 is electrically connected to the second end of the second capacitor C32, and the second end of the second current output circuit 340 and the second end of the ninth switch tube M39 are both grounded.

[0173] The control circuit 330 can control the second current output circuit 340 to conduct according to the second clock signal PH32, so that the ninth switch tube M39 is conducted. Thus, when the second clock signal PH32 is on, the fourth switch tube M34 is conducted, so that the third capacitor C33 is charged, and the second energy storage branch enters the charging stage.

[0174] When the first clock signal PH31 is on, the seventh switch tube M37 and the eighth switch tube M38 are both turned on, so that the third capacitor C33 can discharge to the second capacitor C32, and the second-stage energy storage branch enters the discharge stage.

[0175] In summary, the control circuit can control the second current output circuit to be turned on according to the second clock signal, so that the ninth switch tube is turned on. In this way, when the second clock signal is on, the fourth switch tube is turned on, so that the second energy storage branch can enter the charging stage. When the first clock signal is on, since both the seventh and eighth switch tubes are turned on, the second energy storage branch enters the discharging stage.

[0176] Based on the description of the above embodiment, a possible implementation of the control circuit 330 is exemplified. Figure 4 As shown, the control circuit 330 may include: a first sub-control circuit 331, a second sub-control circuit 332 and a third sub-control circuit.

[0177] The output end of the first sub-control circuit 331 is electrically connected to the control end of the first current output circuit 320, the output end of the second sub-control circuit 332 is electrically connected to the control end of the second current output circuit 340, and the output end of the third sub-control circuit is electrically connected to the control end of the third switch tube M33 and the control end of the first current output circuit 320 respectively.

[0178] When the input voltage VS2 of the charge pump is less than the first threshold voltage, the first sub-control circuit 331 can control the first current output circuit 320 to be turned on according to the first clock signal PH31, so that the first-stage energy storage branch can enter the charging stage.

[0179] Regardless of whether the input voltage VS2 of the charge pump is less than the first threshold voltage or greater than the first threshold voltage, the second sub-control circuit 332 can control the second current output circuit 340 to be turned on according to the second clock signal PH32, so that the second-level energy storage branch can enter the charging stage.

[0180] When the input voltage VS2 of the charge pump is greater than the first threshold voltage, the third sub-control circuit can control the third switch tube M33 to be always turned on, and control the first current output circuit 320 to be always turned off, so that the first-stage energy storage branch does not work.

[0181] In summary, when the input voltage of the charge pump is less than the first threshold voltage, the first sub-control circuit can control the first current output circuit to be turned on according to the first clock signal, so that the first-stage energy storage branch can be charged. The second sub-control circuit can control the second current output circuit to be turned on according to the second clock signal, so that the second-stage energy storage branch can be charged. When the input voltage of the charge pump is greater than the first threshold voltage, the third sub-control circuit can control the fifth switch tube to be always turned on, and control the first current output circuit to be always turned off, so that the first-stage energy storage branch does not work.

[0182] Based on the description of the above embodiment, a possible implementation of the first current output circuit 320 is exemplified. Figure 4 As shown, the first current output circuit 320 may include: a constant current source, a first transistor M310, a second transistor M311 and a third transistor M312.

[0183] The output end of the constant current source is electrically connected to the second end of the first transistor M310, the first end of the first transistor M310 is electrically connected to the first end of the second transistor M311, the control end of the second transistor M311 is electrically connected to the control end of the sixth switch tube M36, the first end of the third transistor M312 is electrically connected between the first end of the first transistor M310 and the first end of the second transistor M311, the control end of the first transistor M310 and the control end of the third transistor M312 are both electrically connected to the output end of the first sub-control circuit 331, and the second end of the second transistor M311 and the second end of the third transistor M312 are both grounded.

[0184] The constant current source can output the first charging current I1. In this way, when the first sub-control circuit 331 controls the first current output circuit 320 to be turned on, the first transistor M310, the second transistor M311 and the third transistor M312 are all turned on, so that the sixth switch tube M36 is turned on. In this way, the sixth switch tube M36 can mirror the current of the second transistor M311, so that the charging current of the sixth switch tube M36 is N times the first charging current I1. Wherein N is a positive integer. Thus, the first capacitor C331 can be charged.

[0185] The charging current of the sixth switch tube M36 determines the voltage stored on the first capacitor C331.

[0186] The current value of the first charging current I1 is greater than the maximum current value of the second charging current I2 output by the second current output circuit 340, so that the charging current of the sixth switch tube M36 is greater than the charging current of the ninth switch tube M39. In this way, it is possible to prevent the charging amount of the first capacitor C331 from being less than the discharge amount of the first capacitor C331 to the third capacitor C33, so that the voltage stored on the first capacitor C331 will not drop to 0. Therefore, the risk of the output voltage VO2 being too low can be avoided.

[0187] In summary, the constant current source can output the first charging current. In this way, the sixth switch tube can be turned on through the first transistor, the second transistor and the third transistor, so that the sixth switch tube can mirror the current of the second transistor. Thus, the first capacitor can be charged.

[0188] Based on the description of the above embodiment, a possible implementation of the second current output circuit 340 is exemplified. Figure 4 As shown, the second current output circuit 340 may include: a first sampling circuit, an operational amplifier, a fourth transistor M313, a fifth transistor M314 and a sixth transistor M315.

[0189] The input end of the first sampling circuit is electrically connected to the first end of the second capacitor C32, the output end of the first sampling circuit is electrically connected to the first input end of the operational amplifier, the second input end of the operational amplifier is electrically connected to the reference voltage VREF, the output end of the operational amplifier is electrically connected to the second end of the fourth transistor M313, the first end of the fourth transistor M313 is electrically connected to the first end of the fifth transistor M314, the control end of the fifth transistor M314 is electrically connected to the control end of the ninth switch tube M39, the first end of the sixth transistor M315 is electrically connected between the first end of the fourth transistor M313 and the first end of the fifth transistor M314, the control end of the fourth transistor M313 and the control end of the sixth transistor M315 are both electrically connected to the output end of the second sub-control circuit 332, and the second end of the fifth transistor M314 and the second end of the sixth transistor M315 are both grounded.

[0190] The first sampling circuit can collect the voltage stored on the second capacitor C32. In addition, the first sampling circuit can transmit the voltage stored on the second capacitor C32 to the operational amplifier. In this way, the operational amplifier can adjust the magnitude of the second charging current I2 according to the magnitude relationship between the voltage stored on the second capacitor C32 and the reference voltage VREF, thereby controlling the second current output circuit 340.

[0191] Wherein, when the voltage stored on the second capacitor C32 is greater than the target voltage stored on the second capacitor C32, the operational amplifier reduces the second charging current I2. In this way, when the second sub-control circuit 332 controls the second current output circuit 340 to be turned on, the fourth transistor M313, the fifth transistor M314 and the sixth transistor M315 are all turned on, so that the ninth switch tube M39 is turned on. In this way, the ninth switch tube M39 can mirror the current of the fifth transistor M314, so that the charging current of the ninth switch tube M39 is N times the second charging current I2, so that the third capacitor C33 can be charged. Wherein, N is a positive integer. Under the action of the reduced second charging current I2, the voltage stored on the third capacitor C33 is also reduced. Thus, the voltage stored on the second capacitor C32 is reduced. When the voltage stored on the second capacitor C32 is less than the target voltage stored on the second capacitor C32, the operational amplifier increases the second charging current I2. In this way, under the action of the increased second charging current I2, the voltage stored on the third capacitor C33 is also increased. Thus, the voltage stored on the second capacitor C32 increases.

[0192] The charging current of the ninth switch tube M39 determines the voltage stored on the third capacitor C33.

[0193] In summary, the first sampling circuit can collect the voltage stored on the second capacitor and transmit the voltage stored on the second capacitor to the operational amplifier, so that the operational amplifier can obtain the voltage stored on the second capacitor. In this way, the operational amplifier can adjust the magnitude of the second charging current according to the voltage stored on the second capacitor and the reference voltage, thereby realizing the control of the second current output circuit.

[0194] Based on the description of the above embodiment, a possible implementation of the second current output circuit 340 is exemplified. Figure 4 As shown, the second current output circuit 340 may include: a first sampling circuit, a first operational amplifier OP1, a fourth transistor M313, a fifth transistor M314 and a sixth transistor M315.

[0195] The input end of the first sampling circuit is electrically connected to the first end of the second capacitor C32, the output end of the first sampling circuit is electrically connected to the first input end of the first operational amplifier OP1, the second input end of the first operational amplifier OP1 is electrically connected to the first reference voltage VREF1, the output end of the first operational amplifier OP1 is electrically connected to the second end of the fourth transistor M313, the first end of the fourth transistor M313 is electrically connected to the first end of the fifth transistor M314, the control end of the fifth transistor M314 is electrically connected to the control end of the ninth switch tube M39, the first end of the sixth transistor M315 is electrically connected between the first end of the fourth transistor M313 and the first end of the fifth transistor M314, the control end of the fourth transistor M313 and the control end of the sixth transistor M315 are both electrically connected to the output end of the second sub-control circuit 332, and the second end of the fifth transistor M314 and the second end of the sixth transistor M315 are both grounded.

[0196] The first sampling circuit can collect the voltage stored on the second capacitor C32. In addition, the first sampling circuit can transmit the voltage stored on the second capacitor C32 to the first operational amplifier OP1. In this way, the first operational amplifier OP1 can adjust the magnitude of the second charging current I2 according to the voltage stored on the second capacitor C32 and the first reference voltage VREF1, so that the voltage stored on the second capacitor C32 remains stable.

[0197] In summary, the first sampling circuit can collect the voltage stored on the second capacitor and transmit the voltage stored on the second capacitor to the second operational amplifier, so that the second operational amplifier can obtain the voltage stored on the second capacitor. In this way, the second operational amplifier can adjust the magnitude of the second charging current according to the voltage stored on the second capacitor and the first reference voltage, so that the voltage stored on the second capacitor remains stable.

[0198] Based on the description of the above embodiment, a possible implementation of the second current output circuit 340 is exemplified. Figure 4 As shown, the second current output circuit 340 may include: a first sampling circuit, a first operational amplifier OP1, a fourth transistor M313, a fifth transistor M314 and a sixth transistor M315.

[0199] The input end of the first sampling circuit is electrically connected to the first end of the third capacitor C33, the output end of the first sampling circuit is electrically connected to the first input end of the first operational amplifier OP1, the second input end of the first operational amplifier OP1 is electrically connected to the first reference voltage VREF, the output end of the first operational amplifier OP1 is electrically connected to the second end of the fourth transistor M313, the first end of the fourth transistor M313 is electrically connected to the first end of the fifth transistor M314, the control end of the fifth transistor M314 is electrically connected to the control end of the ninth switch tube M39, the first end of the sixth transistor M315 is electrically connected between the first end of the fourth transistor M313 and the first end of the fifth transistor M314, the control end of the fourth transistor M313 and the control end of the sixth transistor M315 are both electrically connected to the output end of the second sub-control circuit 332, and the second end of the fifth transistor M314 and the second end of the sixth transistor M315 are both grounded.

[0200] The first sampling circuit can collect the voltage stored on the third capacitor C33. In addition, the first sampling circuit can transmit the voltage stored on the third capacitor C33 to the first operational amplifier OP1. In this way, the first operational amplifier OP1 can adjust the magnitude of the second charging current I2 according to the voltage stored on the third capacitor C33 and the first reference voltage VREF, so that the voltage stored on the second capacitor C32 remains stable.

[0201] In addition, the first sampling circuit has good transient performance, so that the first sampling circuit can change along with the change of the voltage stored on the third capacitor C33, and the first sampling circuit can obtain a determined voltage stored on the third capacitor C33.

[0202] In summary, the first sampling circuit can collect the voltage stored on the third capacitor and transmit the voltage stored on the third capacitor to the second operational amplifier. In this way, the second operational amplifier can adjust the magnitude of the second charging current according to the voltage stored on the third capacitor and the first reference voltage, so that the voltage stored on the second capacitor remains stable.

[0203] also, Figure 4 The third switch tube M33, the fifth switch tube M35, the fourth switch tube M34, the seventh switch tube M37 and the eighth switch tube M38 are all P-type switch tubes.

[0204] In a possible design, the charge pump further includes a third resistor R3, and the second end of the third switch tube M23 is connected to the top plate of the first capacitor C21 through the third resistor R3.

[0205] The implementation principle of the first driving circuit of this embodiment is similar to that of the above embodiment and will not be described again here.

[0206] The charge pump provided in the present embodiment has a first-stage energy storage branch. Through the arrangement of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage. The level conversion circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal has a value range from the power supply voltage to the voltage at the second end of the first switch tube, thereby making the output end voltage of the level conversion circuit larger, making the voltage division of the first clock signal on the energy storage branch where the driving circuit is located smaller, reducing the current of the energy storage branch, limiting the current of the energy storage branch at this stage, using the original driving circuit of the charge pump, making a simple change to the driving circuit, realizing current limiting protection of the charge pump, making the current in the charge pump controlled below the current limiting value, ensuring the normal operation of the charge pump while saving cost and circuit area, and improving the reliability and safety of the charge pump.

[0207] In one possible design, please refer to Figure 2 The charge pump further includes a third resistor R3, and the second end of the third switch tube M23 is connected to the top plate of the first capacitor C21 through the third resistor R3.

[0208] In practical applications, the first-stage energy storage branch in the charge pump is current limited by the third resistor R3. When the input voltage VCC is powered on, the peak current is VCC / R3, thereby playing a role of current limiting when powered on.

[0209] The charge pump provided in this embodiment plays a current limiting role when power is turned on by adding a resistor in the first-stage energy storage branch. When the charge pump works normally, the current is approximately the converted control voltage divided by the third resistor, which also plays a current limiting role on the first-stage energy storage branch, thereby ensuring the normal operation of the charge pump and improving the reliability and safety of the charge pump.

[0210] In one possible design, please refer to Figure 2 The second energy storage branch includes a fourth switch tube M24 and a second capacitor C22. The top plate of the second capacitor C22 is connected to the top plate of the first capacitor C21 through the fourth switch tube M24.

[0211] The driving circuit provided in this embodiment includes a second driving circuit 212, the output end of the second driving circuit 212 is connected to the control end of the fourth switch tube M24, and the second power supply voltage of the second driving circuit comes from the top plate of the second capacitor C22.

[0212] The second driving circuit 212 includes: a second voltage stabilizing diode, a second voltage divider circuit, a second current source, a second level conversion circuit, a seventh switch tube, and an eighth switch tube.

[0213] The control end of the seventh switch tube is connected to the output end of the second voltage divider circuit, the first end of the seventh switch tube is connected to the second end of the eighth switch tube, the control end of the eighth switch tube is connected to the anode of the second voltage regulator diode, and the first end of the eighth switch tube is grounded.

[0214] The cathode of the second voltage stabilizing diode is used to receive the second power supply voltage VCC+VCC. The anode of the second voltage stabilizing diode is grounded through the second current source.

[0215] The second voltage divider circuit is connected in parallel with the second voltage zener diode. The second voltage divider circuit is used to divide the voltage across the second voltage zener diode and output the second divided voltage at the output end, so that the voltage at the second end of the seventh switch tube is higher than the difference between the second power supply voltage and the second divided voltage;

[0216] Furthermore, the second voltage divider circuit includes a sixth resistor and a seventh resistor connected in series. The first end of the sixth resistor is connected to the cathode of the second voltage zener diode, the second end of the sixth resistor is connected to the first end of the seventh resistor; the second end of the seventh resistor is connected to the anode of the second voltage zener diode, and the first end of the seventh resistor is connected to the control end of the seventh switch tube.

[0217] The input end of the second level conversion circuit is used to receive the second clock signal PH22, and the output end of the second level conversion circuit is the output end of the second driving circuit 212. The output end of the second level conversion circuit is connected to the control end of the fourth switch tube M24.

[0218] The first power supply terminal of the second level conversion circuit is used to receive the second power supply voltage. The second power supply terminal of the second level conversion circuit is connected to the second terminal of the seventh switch tube.

[0219] The second level conversion circuit is used to convert the level value of the second clock signal PH22, and output the converted second first clock signal at the output end of the second level conversion circuit. The level value of the converted second first clock signal ranges from the second power supply voltage to the voltage of the second end of the seventh switch tube.

[0220] Further, the second level conversion circuit includes a second level converter and a multi-stage inverter connected in series. The input end of the second level converter is used to receive the first clock signal. The output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the second driving circuit. For example, please continue to refer to Figure 2 , Figure 2, two-stage inverters are exemplarily shown, namely the third inverter and the fourth inverter, wherein the input end of the third inverter is connected to the output end of the second level converter, the output end of the third inverter is connected to the input end of the fourth inverter, and the output end of the fourth inverter is the output end of the second driving circuit.

[0221] The implementation principle of the second driving circuit of this embodiment is similar to that of the first driving circuit in the above embodiment, and will not be described again here.

[0222] The charge pump provided in the present embodiment has a second-stage energy storage branch. Through the arrangement of the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the driving circuit, the voltage-dividing circuit makes the voltage at the second end of the first switch tube higher than the difference between the power supply voltage and the voltage-dividing voltage. The level conversion circuit converts the level value of the first clock signal and outputs the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal ranges from the power supply voltage to the voltage at the second end of the first switch tube, thereby making the output end voltage of the level conversion circuit larger, making the voltage division of the first clock signal on the energy storage branch where the driving circuit is located smaller, reducing the current of the energy storage branch, limiting the current of the energy storage branch at this stage, using the original driving circuit of the charge pump, making a simple change to the driving circuit, realizing current limiting protection of the charge pump, so that the current in the charge pump is controlled below the current limiting value, and ensuring the normal operation of the charge pump while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0223] Furthermore, the charge pump further includes a fourth resistor R4, and the second end of the fourth switch tube M24 is connected to the top plate of the second capacitor C22 through the fourth resistor R4.

[0224] In practical applications, the second-stage energy storage branch in the charge pump is current limited by the fourth resistor R4. When the input voltage 2VCC is powered on, the peak current is 2VCC / R4, thereby playing a role of current limiting when powered on.

[0225] The charge pump provided in this embodiment plays a current limiting role when power is turned on by adding a resistor in the second-stage energy storage branch. When the charge pump works normally, the current is approximately the converted control voltage divided by the fourth resistor, which also plays a current limiting role on the second-stage energy storage branch, thereby ensuring the normal operation of the charge pump and improving the reliability and safety of the charge pump.

[0226] In one possible design, please refer to Figure 2 The second energy storage branch further includes a fifth switch tube M25. The bottom plate of the second capacitor C22 is connected to the bottom plate of the first capacitor C21 through the fifth switch tube M25.

[0227] The driving circuit provided in this embodiment includes a third driving circuit 230 , the output end of the third driving circuit 230 is connected to the control end of the fifth switch tube M25 , and the third power supply voltage of the third driving circuit 230 comes from the input voltage.

[0228] The third driving circuit 230 includes: a third voltage stabilizing diode, a third voltage dividing circuit, a third current source, a third level conversion circuit, a ninth switch tube, and a tenth switch tube.

[0229] The control end of the ninth switch tube is connected to the output end of the third voltage divider circuit, the first end of the ninth switch tube is connected to the second end of the tenth switch tube, the control end of the tenth switch tube is connected to the anode of the third voltage regulator diode, and the first end of the tenth switch tube is grounded.

[0230] The cathode of the third voltage stabilizing diode is used to receive the third power supply voltage VCC. The anode of the third voltage stabilizing diode is grounded through the third current source.

[0231] The third voltage-dividing circuit is connected in parallel with the third voltage-stabilizing diode. The third voltage-dividing circuit is used to divide the voltage across the third voltage-stabilizing diode and output the third divided voltage at the output end, so that the voltage at the second end of the ninth switch tube is higher than the difference between the third power supply voltage and the third divided voltage;

[0232] Furthermore, the third voltage divider circuit includes an eighth resistor and a ninth resistor connected in series. The first end of the eighth resistor is connected to the cathode of the third voltage zener diode, the second end of the eighth resistor is connected to the first end of the ninth resistor; the second end of the ninth resistor is connected to the anode of the third voltage zener diode, and the first end of the ninth resistor is connected to the control end of the ninth switch tube.

[0233] The input end of the third level conversion circuit is used to receive the second clock signal PH22, and the output end of the third level conversion circuit is the output end of the third driving circuit 230. The output end of the third level conversion circuit is connected to the control end of the fifth switch tube M25.

[0234] The first power supply terminal of the third level conversion circuit is used to receive the third power supply voltage. The second power supply terminal of the third level conversion circuit is connected to the second terminal of the ninth switch tube.

[0235] Further, the third level conversion circuit includes a third level converter and a multi-stage inverter connected in series. The input end of the third level converter is used to receive the first clock signal. The output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the third driving circuit. For example, please continue to refer to Figure 2 , Figure 2, two-stage inverters are exemplarily shown, namely the fifth inverter and the sixth inverter, wherein the input end of the fifth inverter is connected to the output end of the third level converter, the output end of the fifth inverter is connected to the input end of the sixth inverter, and the output end of the sixth inverter is the output end of the third driving circuit.

[0236] The level conversion circuit is used to convert the level value of the second clock signal PH22, and output the converted third first clock signal at the output end of the level conversion circuit. The level value of the converted third first clock signal ranges from the third power supply voltage to the voltage of the second end of the ninth switch tube.

[0237] The implementation principle of the third driving circuit of this embodiment is similar to that of the first driving circuit in the above embodiment, and will not be described again here.

[0238] The charge pump provided in the present embodiment, in the second-stage energy storage branch, makes the resistance voltage division of the energy storage branch where the drive circuit is located smaller by setting the voltage-stabilizing diode, the voltage-dividing circuit, the switch tube and the level conversion circuit in the drive circuit, thereby controlling the current of the energy storage branch and limiting the current of the energy storage branch of this stage. By using the original drive circuit of the charge pump and making simple changes to the drive circuit, the current limiting protection of the charge pump is realized, so that the current in the charge pump is controlled below the current limiting value, and the normal operation of the charge pump is guaranteed while saving cost and circuit area, thereby improving the reliability and safety of the charge pump.

[0239] Furthermore, the charge pump further includes a fifth resistor R5, and the second end of the fifth switch tube M25 is connected to the bottom plate of the second capacitor C21 through the fifth resistor R5.

[0240] In practical applications, the second-stage energy storage branch in the charge pump is current limited by the fifth resistor R5. When the input voltage VCC is powered on, the peak current is VCC / R5, thereby playing a role of current limiting when powered on.

[0241] The charge pump provided in this embodiment plays a current limiting role when power is turned on by adding a resistor in the second-stage energy storage branch. When the charge pump works normally, the current is approximately the converted control voltage divided by the fifth resistor, which also plays a current limiting role on the second-stage energy storage branch, thereby ensuring the normal operation of the charge pump and improving the reliability and safety of the charge pump.

[0242] It should be noted that in the charge pump, the driving circuit can be set at any position in the above-mentioned possible design mode, and can also be set at the positions corresponding to the switch tubes of two or more energy storage branches at the same time. The present disclosure does not limit the number of driving circuits set in the charge pump. Figure 2In the charge pump shown, driving circuits may be respectively provided on the branches of the third switch tube M23, the fourth switch tube M24 and the fifth switch tube M25, so as to limit the current of the charge pump.

[0243] In some embodiments, the driving circuit may further include: Figure 4 At least one of the fifth driving circuit, the sixth driving circuit, the seventh driving circuit and the eighth driving circuit shown has a structure, an implementation principle and beneficial effects similar to those of the first driving circuit described above, and will not be described in detail here.

[0244] An embodiment of the present disclosure provides a chip, comprising a driving circuit as described in any of the above embodiments.

[0245] The implementation principle and technical effects of the chip provided in this embodiment are similar to those of the above embodiments and will not be repeated here.

[0246] An embodiment of the present disclosure provides a chip, comprising a charge pump as described in any of the above embodiments.

[0247] The implementation principle and technical effects of the chip provided in this embodiment are similar to those of the above embodiments and will not be repeated here.

[0248] An embodiment of the present disclosure provides an electronic device, comprising a driving circuit as described in any of the above embodiments.

[0249] The implementation principle and technical effects of the electronic device provided in this embodiment are similar to those of the above embodiments and will not be described in detail here.

[0250] An embodiment of the present disclosure provides an electronic device, comprising a charge pump as described in any of the above embodiments.

[0251] The implementation principle and technical effects of the electronic device provided in this embodiment are similar to those of the above embodiments and will not be described in detail here.

[0252] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

Claims

1. A driving circuit, characterized in that: Applied to a charge pump, the charge pump comprises at least two energy storage branches, the output end of the first energy storage branch is connected to the input end of the next energy storage branch; each of the at least two energy storage branches comprises at least one switch tube and a capacitor; the output end of the drive circuit is connected to the control end of at least one switch tube in the first energy storage branch; The at least two-stage energy storage branch includes the first energy storage branch; The driving circuit comprises: a voltage stabilizing diode, a voltage dividing circuit, a current source, a level conversion circuit, a first switch tube, and a second switch tube; The input end of the level conversion circuit is used to receive the first clock signal, and the output end of the level conversion circuit is the output end of the driving circuit; the first power supply end of the level conversion circuit is used to receive the power supply voltage, and the second power supply end of the level conversion circuit is connected to the second end of the first switch tube; the control end of the first switch tube is connected to the output end of the voltage divider circuit, the first end of the first switch tube is connected to the second end of the second switch tube, the control end of the second switch tube is connected to the positive electrode of the voltage regulator diode, and the first end of the second switch tube is grounded; the negative electrode of the voltage regulator diode is used to receive the power supply voltage, and the positive electrode of the voltage regulator diode is grounded through the current source; the voltage divider circuit is connected in parallel with the voltage regulator diode; The voltage divider circuit is used to divide the voltage across the voltage zener diode and output the divided voltage at the output end, so that the voltage at the second end of the first switch tube is higher than the difference between the power supply voltage and the divided voltage; The level conversion circuit is used to convert the level value of the first clock signal and output the converted first clock signal at the output end of the level conversion circuit. The level value of the converted first clock signal has a value range from the power supply voltage to the voltage of the second end of the first switch tube.

2. The driving circuit according to claim 1, characterized in that: The voltage divider circuit includes a first resistor and a second resistor connected in series; the first end of the first resistor is connected to the cathode of the voltage-regulating diode, and the second end of the first resistor is connected to the first end of the second resistor; the second end of the second resistor is connected to the anode of the voltage-regulating diode, and the first end of the second resistor is connected to the control end of the first switching tube.

3. The driving circuit according to claim 1, characterized in that: The level conversion circuit includes a level converter and a multi-stage inverter connected in series in sequence; the input end of the level converter is used to receive the first clock signal; the output end of the last stage inverter in the multi-stage inverter connected in series is the output end of the drive circuit.

4. A charge pump, characterized in that: The charge pump comprises a driving circuit and at least two energy storage branches, the output end of the first energy storage branch is connected to the input end of the next energy storage branch; each energy storage branch in the at least two energy storage branches comprises at least one switch tube and a capacitor; the output end of the driving circuit is connected to the control end of at least one switch tube in the first energy storage branch; the at least two energy storage branches include the first energy storage branch; The driving circuit is the driving circuit according to any one of claims 1 to 3.

5. The charge pump according to claim 4, characterized in that The first-stage energy storage branch includes a third switch tube and a first capacitor; the first end of the third switch tube is used to connect the input voltage; the second end of the third switch tube is connected to the top plate of the first capacitor; The driving circuit includes a first driving circuit, an output end of the first driving circuit is connected to a control end of the third switch tube, and a power supply voltage of the first driving circuit comes from a top plate of the first capacitor.

6. The charge pump according to claim 4, characterized in that The charge pump further includes a control circuit; the first-stage energy storage branch includes a third switch tube, a sixth switch tube, a fifth switch tube, a first capacitor, and a first current output circuit; the control end of the third switch tube, the control end of the first current output circuit, and the control end of the second-stage energy storage branch are electrically connected to the control circuit respectively, the first end of the third switch tube and the second end of the fifth switch tube are both electrically connected to the input voltage, the second end of the third switch tube is electrically connected to the input end of the second-stage energy storage branch, the first end of the first capacitor is electrically connected between the second end of the third switch tube and the input end of the second-stage energy storage branch, the second end of the first capacitor is electrically connected to the first end of the sixth switch tube, the control end of the sixth switch tube is electrically connected to the first end of the first current output circuit, the first end of the fifth switch tube is electrically connected between the second end of the first capacitor and the first end of the sixth switch tube, the second end of the first current output circuit, the second end of the sixth switch tube, and the first end of the second-stage energy storage branch are all grounded, and the output end of the second-stage energy storage branch is used to output the output voltage of the charge pump; The control circuit is used for controlling the first current output circuit to turn on the sixth switch tube according to a first clock signal when the input voltage of the charge pump is less than a first threshold voltage, so as to charge the first capacitor with the input voltage of the charge pump; and, according to a second clock signal, controlling the second-stage energy storage branch to charge using the output voltage of the first-stage energy storage branch; When the first clock signal is on, the third switch tube is turned on to charge the first capacitor; The second-stage energy storage branch is used to boost the output voltage of the first-stage energy storage branch to obtain the output voltage of the charge pump, and the output voltage of the charge pump is three times the input voltage of the charge pump; When the second clock signal is on, the fifth switch tube is turned on, so that the first charge pump circuit boosts the input voltage of the multi-stage charge pump to obtain the output voltage of the first charge pump circuit, and the output voltage of the first charge pump circuit is twice the input voltage of the multi-stage charge pump; the second charge pump circuit is used to charge using the output voltage of the first charge pump circuit; The first clock signal and the second clock signal are two-phase clocks that do not overlap and have a duty cycle of 50%.

7. The charge pump according to claim 5 or 6, characterized in that: The charge pump further includes a third resistor, and the second end of the third switch tube is connected to the top plate of the first capacitor through the third resistor.

8. The charge pump according to claim 7, characterized in that The second-stage energy storage branch includes a fourth switch tube and a second capacitor; the top plate of the second capacitor is connected to the top plate of the first capacitor through the fourth switch tube; The driving circuit includes a second driving circuit, an output end of the second driving circuit is connected to the control end of the fourth switch tube, and a power supply voltage of the second driving circuit comes from a top plate of the second capacitor.

9. The charge pump according to claim 8, characterized in that The charge pump further includes a fourth resistor, and the second end of the fourth switch tube is connected to the top plate of the second capacitor through the fourth resistor.

10. The charge pump according to claim 5, characterized in that The second-stage energy storage branch further includes a fifth switch tube; the bottom plate of the second capacitor is connected to the bottom plate of the first capacitor through the fifth switch tube; The driving circuit includes a third driving circuit, the output end of the third driving circuit is connected to the control end of the fifth switch tube, and the power supply voltage of the third driving circuit comes from the input voltage.

11. The charge pump according to claim 9 or 10, characterized in that: The charge pump further includes a fifth resistor, and the second end of the fifth switch tube is connected to the bottom plate of the second capacitor through the fifth resistor.

12. A chip, characterized in that: The invention comprises a driving circuit as claimed in any one of claims 1 to 3; or comprises a charge pump as claimed in any one of claims 4 to 11.

13. An electronic device, characterized in that: comprising a driving circuit as claimed in any one of claims 1 to 3; or Comprising a charge pump as claimed in any one of claims 4 to 11.

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