Switching tube driving circuit and energy storage power supply

Abstract

The embodiment of the utility model discloses a switch tube driving circuit and an energy storage power supply, the circuit comprises a voltage reduction module, the input end of which is connected with an input power supply VDD2, and the level of the first output end of the voltage reduction module jumps under the control of a switch unit in the voltage reduction module; an input end of the charge pump module is connected with an input power supply VDD1, an output end of the charge pump module is connected with the post-stage module, a first end of a bridging capacitor unit in the charge pump module receives a first input power supply voltage, and a second end of the bridging capacitor unit is connected with a first output end of the step-down module; the first terminal voltage of the bridging capacitor unit changes in response to the first input power supply voltage and the level jump of the first output end of the step-down module so as to serve as the driving voltage to be output by the output end of the charge pump module. According to the embodiment of the utility model, the purpose of driving multiple paths of high-side NMOS tubes can be achieved under the condition of avoiding the design of a complicated transformer, the working efficiency and the driving capability of the circuit are improved, the circuit structure is simplified, and the hardware cost is reduced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of circuit technology, and in particular to a switch tube driving circuit and an energy storage power supply. Background Art

[0002] The battery management system (BMS) uses a PMOS tube to control the high-side main circuit. Since the cost of a PMOS tube is higher than that of an NMOS tube, and the on-resistance of a PMOS tube is larger than that of an NMOS tube under the same specifications, the power consumption of a PMOS tube is greater than that of an NMOS tube when a large current flows through the main circuit.

[0003] In order to reduce costs, NMOS tubes can be used to control the high-side loop, and using NMOS tubes to control the high-side loop requires a corresponding drive circuit. The high-side NMOS tube is generally controlled by a DC / DC circuit to step down the voltage, and then output multiple drive voltages through a transformer. This method requires the use of a transformer and the design of various transformer-related parameters, which is complex and costly. When a general drive circuit uses a linear power supply to drive the NMOS tube, the power consumption is large, the efficiency is low, and the drive capability is limited. Utility Model Content

[0004] The main technical problem solved by the embodiments of the utility model is to provide a switch tube driving circuit and an energy storage power supply, which can utilize the characteristic that the voltage across the capacitor cannot change suddenly, and achieve the purpose of multiplying the input voltage through switch control and charging and discharging of the capacitor, thereby obtaining the desired output voltage.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a switch tube driving circuit, including: a step-down module, the input end of the step-down module is connected to the input power supply VDD2, and the level of the first output end of the step-down module jumps under the control of the switch unit in the step-down module; a charge pump module, the input end of the charge pump module is connected to the input power supply VDD1, the output end of the charge pump module is connected to the post-stage module, the first end of the cross-capacitor unit in the charge pump module receives the first input power supply voltage, the second end of the cross-capacitor unit is connected to the first output end of the step-down module, and the first end voltage of the cross-capacitor unit changes in response to the level jump of the first input power supply voltage and the first output end of the step-down module, so as to be output by the output end of the charge pump module as a driving voltage.

[0006] In some embodiments, the charge pump module also includes a resistor R1, a capacitor C1, a capacitor C2, a diode DS1 and a diode DS2, wherein the first end of the capacitor C1, the first end of the capacitor C2 and the anode of the diode DS1 are connected to the input power supply VDD1, the cathode of the diode DS1 is connected to the anode of the diode DS2 and the first end of the cross-capacitor unit, the second end of the capacitor C1 and the second end of the capacitor C2 are connected to the cathode of the diode DS2; the first end of the resistor R1 is connected to the output end of the switch unit, and the second end of the resistor R1 is connected to the second end of the cross-capacitor unit.

[0007] In some embodiments, the cross-connected capacitor unit includes a capacitor C3 and a capacitor C4, wherein a first end of the capacitor C3 is connected to a second end of the resistor R1, a second end of the capacitor C3 is connected to a first end of the capacitor C4, and a second end of the capacitor C4 is connected to a cathode of the diode DS1 and an anode of the diode DS2.

[0008] In some embodiments, the step-down module further includes a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a capacitor CE1, a capacitor CE2, an inductor L1, an inductor L2 and a resistor R11, wherein a first end of the capacitor C5 and a first end of the inductor L1 are connected to the input power supply VDD2, a second end of the inductor L1 is connected to a first end of the capacitor CE1, a first end of the capacitor C6 and an input end of the switch unit, and a second end of the capacitor C5, a second end of the capacitor CE1 and a second end of the capacitor C6 are grounded; a first end of the resistor R11 and a first end of the inductor L2 are connected to an output end of the switch unit, a second end of the resistor R11 is connected to a first end of the capacitor C8, a second end of the inductor L2 is connected to a first end of the capacitor CE2 and a first end of the capacitor C9, and a second end of the capacitor C8, a second end of the capacitor CE2 and a second end of the capacitor C9 are grounded.

[0009] In some embodiments, the switch unit includes a driver chip U1, a resistor R7, a resistor R8, a resistor R9, a resistor R10 and a capacitor C7, wherein an input pin of the driver chip U1 is connected to the second end of the inductor L1, a frequency adjustment pin of the driver chip U1 is connected to the first end of the resistor R7, and a switch pin of the driver chip U1 is connected to the first end of the inductor L2 and the second end of the cross-capacitor unit; a feedback pin of the driver chip U1 is connected to the first end of the resistor R8, the first end of the capacitor C7 and the first end of the resistor R10, the second end of the resistor R8 and the second end of the capacitor C7 are connected to the second end of the inductor L2, and a current limiting pin of the driver chip U1 is connected to the first end of the resistor R9; a ground pin of the driver chip U1, a second end of the resistor R7, a second end of the resistor R9 and a second end of the resistor R10 are grounded.

[0010] In some embodiments, the switch unit includes a switch tube Q3 and a switch tube Q4, wherein the drain of the switch tube Q3 is connected to the second end of the inductor L1, the source of the switch tube Q3 is connected to the drain of the switch tube Q4 and the second end of the jumper capacitor unit, and the gate of the switch tube Q3 receives a third control signal; the source of the switch tube Q4 is grounded, and the gate of the switch tube Q4 receives a fourth control signal.

[0011] In some embodiments, the switch tube driving circuit also includes: a voltage stabilizing module, the input end of the voltage stabilizing module is connected to the second output end of the voltage step-down module, and the output end of the voltage stabilizing module is connected to the subsequent circuit; the voltage step-down module is also used to convert the second input power supply voltage into a first output voltage; the voltage stabilizing module is used to convert the first output voltage into a second output voltage to power the subsequent circuit.

[0012] In some embodiments, the switch tube driving circuit also includes: an input module, wherein the power input end of the input module is connected to the input power supply VDD2, the output end of the input module is connected to the input end of the step-down module, and the signal input end of the input module receives an input enable signal; the input module is used to output the second input power supply voltage to the step-down module under the control of the input enable signal.

[0013] In some embodiments, the voltage stabilizing module includes a voltage stabilizing chip U2, an inductor L3, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12 and a diode LED1, wherein the first end of the inductor L3 is connected to the second output end of the step-down module, the second end of the inductor L3 is connected to the first end of the capacitor C10, the first end of the capacitor C11 and the input pin of the voltage stabilizing chip U2, the output pin of the voltage stabilizing chip U2 is connected to the first end of the capacitor C12, the first end of the capacitor C13 and the first end of the resistor R12, and the second end of the resistor R12 is connected to the anode of the diode LED1; the ground pin of the voltage stabilizing chip U2, the second end of the capacitor C10, the second end of the capacitor C11, the second end of the capacitor C12, the second end of the capacitor C13 and the cathode of the diode LED1 are grounded.

[0014] In order to solve the above technical problems, another technical solution adopted by the present invention is: to provide an energy storage power supply, including: a switch tube driving circuit as described above.

[0015] The beneficial effects of the embodiment of the utility model are as follows: Different from the prior art, the embodiment of the utility model utilizes the characteristic that the voltage across the capacitor cannot change suddenly, and achieves the purpose of doubling the input voltage through switch control and charging and discharging the capacitor, thereby obtaining the desired output voltage. The purpose of driving multiple high-side NMOS tubes can be achieved without designing a complex transformer, and at the same time, the PMOS tube can be replaced by an NMOS tube with lower on-resistance, which reduces the cost of the transformer and the MOS tube and the complexity of the peripheral circuit, and improves the working efficiency and driving ability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a switch tube driving circuit provided by an embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of another switch tube driving circuit provided by an embodiment of the utility model;

[0018] Figure 3 This is a circuit diagram of a switch tube driving circuit provided by an embodiment of the utility model;

[0019] Figure 4 This is a circuit diagram of another switch tube driving circuit provided by an embodiment of the utility model;

[0020] Figure 5 This is a circuit diagram of a discharge control module provided by an embodiment of the utility model;

[0021] Figure 6It is a circuit diagram of a charging control module provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0024] The embodiment of the present application provides a switch tube driving circuit, and its structural schematic diagram is as follows: Figure 1 As shown, the switch tube driving circuit includes a buck module 100 and a charge pump module 200 , wherein the buck module 100 includes a switch unit 110 , and the charge pump module 200 includes a jumper capacitor unit 210 .

[0025] In the embodiment of the present application, the input end of the buck module 100 is connected to the input power supply VDD2, and the level of the first output end of the buck module 100 jumps under the control of the switch unit 110 in the buck module; the input end of the charge pump module 200 is connected to the input power supply VDD1, and the output end of the charge pump module 200 is connected to the subsequent module 300. The first end of the cross-capacitor unit 210 in the charge pump module 200 receives the first input power supply voltage, and the second end of the cross-capacitor unit 210 is connected to the first output end of the buck module 100. The first end voltage of the cross-capacitor unit 210 changes in response to the level jump of the first input power supply voltage and the first output end of the buck module 200, so as to be output by the output end of the charge pump module 200 as a driving voltage.

[0026] In the embodiment of the present application, the level of the first output terminal of the buck module 100 jumps between 0 and the second input power voltage; the driving voltage is the sum of the second input power voltage and the first input power voltage.

[0027] In some other embodiments of the present application, another switch tube driving circuit is provided, and its structural schematic diagram is as follows: Figure 2 As shown, the switch tube driving circuit includes a buck module 100 , a charge pump module 200 , an input module 400 and a voltage stabilizing module 500 , wherein the buck module 100 includes a switch unit 110 , and the charge pump module 200 includes a cross-capacitor unit 210 .

[0028] The power input end of the input module 400 is connected to the input power supply VDD2, the output end of the input module 400 is connected to the input end of the buck module 100, and the signal input end of the input module 400 receives an input enable signal; the input module 400 is used to output the second input power supply voltage to the buck module 100 under the control of the input enable signal.

[0029] The level of the first output end of the buck module 100 jumps under the control of the switch unit 110 in the buck module; the input end of the charge pump module 200 is connected to the input power supply VDD1, the output end of the charge pump module 200 is connected to the subsequent module 300, the first end of the cross-capacitor unit 210 in the charge pump module 200 receives the first input power supply voltage, the second end of the cross-capacitor unit 210 is connected to the first output end of the buck module 100, and the first end voltage of the cross-capacitor unit 210 changes in response to the level jump of the first input power supply voltage and the first output end of the buck module 200, so as to be output by the output end of the charge pump module 200 as a driving voltage.

[0030] The input end of the voltage stabilizing module 500 is connected to the second output end of the voltage step-down module 100, and the output end of the voltage stabilizing module 500 is connected to a subsequent circuit, such as a single-chip microcomputer or an operational amplifier; the voltage step-down module 100 is also used to convert the second input power supply voltage into a first output voltage; the voltage stabilizing module 500 is used to convert the first output voltage into a second output voltage to power the subsequent circuit.

[0031] Figure 3 Shows Figure 2 A circuit structure of a switch tube driving circuit is shown, wherein the charge pump module 200 includes a resistor R1, a capacitor C1, a capacitor C2, a diode DS1 and a diode DS2 in addition to the cross-capacitor unit 210. The first end of the capacitor C1, the first end of the capacitor C2 and the anode of the diode DS1 are connected to the input power supply VDD1, and the cathode of the diode DS1 is connected to the anode of the diode DS2 and the first end of the cross-capacitor unit 210 (i.e. Figure 3 The second end of the capacitor C4 is connected to the cathode of the diode DS2; the first end of the resistor R1 is connected to the output end of the switch unit 110 (ie Figure 3 The second end of the resistor R1 is connected to the second end of the jumper capacitor unit 210 (ie, the switch pin SW of the driving chip U1 shown in FIG. 1 ). Figure 3 A first end of the capacitor C3 is shown.

[0032] The cross-connected capacitor unit 210 includes a capacitor C3 and a capacitor C4, wherein a first end of the capacitor C3 is connected to a second end of the resistor R1, a second end of the capacitor C3 is connected to a first end of the capacitor C4, and a second end of the capacitor C4 is connected to a cathode of the diode DS1 and an anode of the diode DS2.

[0033] In the embodiment of the present application, the diode DS1 and the diode DS2 are Schottky diodes.

[0034] In addition to the switch unit 110, the buck module 100 further includes a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a capacitor CE1, a capacitor CE2, an inductor L1, an inductor L2, and a resistor R11. The first end of the capacitor C5 and the first end of the inductor L1 are connected to the output end of the input module 400 (i.e., Figure 3 The second end of the resistor R2 is connected to the first end of the capacitor CE1, the first end of the capacitor C6 and the input end of the switch unit 110 (ie Figure 3 An input pin IN of the driving chip U1 is shown, a second end of the capacitor C5, a second end of the capacitor CE1 and a second end of the capacitor C6 are grounded GND.

[0035] The first end of the resistor R11 and the first end of the inductor L2 are connected to the output end of the switch unit 110 (ie Figure 3 The switch pin SW of the driving chip U1 is shown in FIG. 1 ), the second end of the resistor R11 is connected to the first end of the capacitor C8, the second end of the inductor L2 is connected to the first end of the capacitor CE2, the first end of the capacitor C9 and the input end of the voltage stabilizing module 500 (i.e. Figure 3 The first end of the inductor L3 is shown as shown, the second ends of the capacitors C8, CE2 and C9 are grounded GND, and the second end of the inductor L2 serves as the second output end of the buck module 100 to output the first voltage V1.

[0036] In the embodiment of the present application, the switching unit 110 includes a driving chip U1, a resistor R7, a resistor R8, a resistor R9, a resistor R10 and a capacitor C7, an input pin IN of the driving chip U1 is connected to the second end of the inductor L1, a frequency adjustment pin FSW of the driving chip U1 is connected to the first end of the resistor R7, and a switch pin SW of the driving chip U1 is connected to the first end of the inductor L2.

[0037] A feedback pin FB of the driving chip U1 is connected to a first end of the resistor R8, a first end of the capacitor C7 and a first end of the resistor R10, a second end of the resistor R8 and a second end of the capacitor C7 are connected to a second end of the inductor L2, a current limiting pin ISET of the driving chip U1 is connected to a first end of the resistor R9; a ground pin GND of the driving chip U1, a second end of the resistor R7, a second end of the resistor R9 and a second end of the resistor R10 are grounded GND.

[0038] The voltage stabilizing module 500 includes a voltage stabilizing chip U2, an inductor L3, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12 and a diode LED1, wherein the first end of the inductor L3 is connected to the second output end of the step-down module (i.e. Figure 3 The second end of the inductor L2 is shown in the figure), the second end of the inductor L3 is connected to the first end of the capacitor C10, the first end of the capacitor C11 and the input pin IN of the voltage stabilizing chip U2, the output pin Vout of the voltage stabilizing chip U2 is connected to the first end of the capacitor C12, the first end of the capacitor C13 and the first end of the resistor R12, and the second end of the resistor R12 is connected to the anode of the diode LED1; the ground pin GND of the voltage stabilizing chip U2, the second end of the capacitor C10, the second end of the capacitor C11, the second end of the capacitor C12, the second end of the capacitor C13 and the cathode of the diode LED1 are grounded GND.

[0039] The input module 400 includes a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a switch tube Q1, a switch tube Q2, a diode DS3 and a diode DS4, wherein the anode of the diode DS3 is connected to the input power supply VDD2, the cathode of the diode DS3 is connected to the first end of the resistor R3 and the source of the switch tube Q1 and the first end of the resistor R3, the drain of the switch tube Q1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the input end (i.e., Figure 3 The first end of the inductor L1 shown in the figure), the second end of the resistor R3 is connected to the gate of the switch tube Q1 and the first end of the resistor R4; the second end of the resistor R4 is connected to the collector of the switch tube Q2, the base of the switch tube Q2 is connected to the first end of the resistor R5 and the first end of the resistor R6, the second end of the resistor R5 is connected to the cathode of the diode DS4, the anode of the diode DS4 receives the input enable signal POW_EN, and the second end of the resistor R6 and the emitter of the switch tube Q2 are grounded GND.

[0040] In the embodiment of the present application, the switch tube Q1 is an NMOS tube, the switch tube Q2 is an NPN transistor, and the diode DS3 and the diode DS4 are Schottky diodes.

[0041] In the embodiment of the present application, the first voltage is 5V and the second voltage is 3.3V.

[0042] Specifically, capacitor C5, capacitor C6, capacitor C8, capacitor C9, capacitor CE1, capacitor CE2, inductor L1, inductor L2, resistor R11, driver chip U1, resistor R7, resistor R8, resistor R9, resistor R10 and capacitor C7 constitute a BUCK circuit, and the second input power supply voltage is reduced to the first voltage or the second voltage by adjusting parameters; resistor R1, capacitor C1, capacitor C2, diode DS1, diode DS2, capacitor C3 and capacitor C4 constitute a charge pump circuit.

[0043] When the driver chip U1 is not turned on, the voltage of the switch pin SW of the driver chip U1 is 0, the first input power voltage charges the capacitor C4 through the diode DS1, and the resistor R1 is a current limiting resistor. When the driver chip U1 is turned on, the voltage at the switch pin SW of the driver chip U1 is the second input power voltage. At this time, the voltage at the first end of the capacitor C5 is the second input power voltage, and the voltage at the second end of the capacitor C6 is the sum of the first input power voltage and the second input power voltage, thereby achieving a voltage rise. When the first input power voltage and the second input power voltage are equal, this is repeated, so that the drive voltage DRV output by the output end of the charge pump circuit is twice the first input power voltage, thereby driving the charge and discharge MOS tube on the high-voltage side of the subsequent stage.

[0044] In addition, the embodiment of the present application also provides a voltage stabilizing chip U2, an inductor L3, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12 and a diode LED1 to form a low voltage difference voltage stabilizing circuit. The first voltage output by the BUCK circuit is input to the low voltage difference voltage stabilizing circuit to output a second voltage to power a single-chip microcomputer or an operational amplifier, etc.

[0045] In addition, the function of the diode DS2 is to prevent voltage backflow when the switch state of the driver chip U1 is switched; the capacitors C1 and C2 are external energy storage capacitors, and a voltage regulator tube can be connected in parallel at both ends of the capacitors C1 and C2 to ensure that the drive voltage DRV output after the charge pump circuit conversion does not exceed the drive voltage range of the charge and discharge MOS tube GS on the high-voltage side of the subsequent stage.

[0046] Figure 4 Shows Figure 2 Another circuit structure of the switch tube driving circuit shown in the figure, wherein the charge pump module 200 includes a resistor R1, a capacitor C1, a capacitor C2, a diode DS1 and a diode DS2 in addition to the cross-connected capacitor unit 210. The first end of the capacitor C1, the first end of the capacitor C2 and the anode of the diode DS1 are connected to the input power supply VDD1, the cathode of the diode DS1 is connected to the anode of the diode DS2 and the first end of the cross-connected capacitor unit 210, and the second end of the capacitor C1 and the second end of the capacitor C2 are connected to the cathode of the diode DS2; the first end of the resistor R1 is connected to the output end of the switch unit 110 (i.e. Figure 4 The second end of the resistor R1 is connected to the second end of the jumper capacitor unit 210 (ie, the source of the switch tube Q3). Figure 4 A first end of the capacitor C3 is shown.

[0047] The cross-connected capacitor unit 210 includes a capacitor C3 , a first end of the capacitor C3 is connected to the second end of the resistor R1 , and a second end of the capacitor C3 is connected to the cathode of the diode DS1 and the anode of the diode DS2 .

[0048] In the embodiment of the present application, the diode DS1 and the diode DS2 are Schottky diodes.

[0049] In addition to the switch unit 110, the buck module 100 further includes a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C9, a capacitor CE1, a capacitor CE2, an inductor L1, an inductor L2, and a resistor R11. The first end of the capacitor C5 and the first end of the inductor L1 are connected to the output end of the input module 400 (i.e., Figure 4 The second end of the resistor R2 is connected to the first end of the capacitor CE1, the first end of the capacitor C6 and the input end of the switch unit 110 (ie Figure 4 A drain of the switch tube Q3 as shown, a second end of the capacitor C5, a second end of the capacitor CE1 and a second end of the capacitor C6 are grounded GND.

[0050] The first end of the resistor R11 and the first end of the inductor L2 are connected to the drain of the switch tube Q3, the second end of the resistor R11 is connected to the first end of the capacitor C8, and the second end of the inductor L2 is connected to the first end of the capacitor CE2, the first end of the capacitor C9 and the input end of the voltage stabilizing module 500 (i.e. Figure 4 The first end of the inductor L3 is shown, the second ends of the capacitors C8, CE2 and C9 are grounded GND, and the second end of the inductor L2 serves as the second output end of the buck module 100 to output the first voltage V1.

[0051] In the embodiment of the present application, the switch unit 110 includes a switch tube Q3 and a switch tube Q4, the drain of the switch tube Q3 is connected to the second end of the inductor L1, the source of the switch tube Q3 is connected to the drain of the switch tube Q4, and the gate of the switch tube Q3 receives the third control signal; the source of the switch tube Q4 is grounded GND, and the gate of the switch tube Q4 receives the fourth control signal.

[0052] In the embodiment of the present application, the third control signal and the fourth control signal are pulse width modulation signals.

[0053] The voltage stabilizing module 500 includes a voltage stabilizing chip U2, an inductor L3, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12 and a diode LED1, wherein the first end of the inductor L3 is connected to the second output end of the step-down module (i.e. Figure 4The second end of the inductor L2 is shown in the figure), the second end of the inductor L3 is connected to the first end of the capacitor C10, the first end of the capacitor C11 and the input pin IN of the voltage stabilizing chip U2, the output pin Vout of the voltage stabilizing chip U2 is connected to the first end of the capacitor C12, the first end of the capacitor C13 and the first end of the resistor R12, and the second end of the resistor R12 is connected to the anode of the diode LED1; the ground pin GND of the voltage stabilizing chip U2, the second end of the capacitor C10, the second end of the capacitor C11, the second end of the capacitor C12, the second end of the capacitor C13 and the cathode of the diode LED1 are grounded GND.

[0054] The input module 400 includes a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a switch tube Q1, a switch tube Q2, a diode DS3 and a diode DS4, wherein the anode of the diode DS3 is connected to the input power supply VDD2, the cathode of the diode DS3 is connected to the first end of the resistor R3 and the source of the switch tube Q1 and the first end of the resistor R3, the drain of the switch tube Q1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the input end (i.e., Figure 4 The first end of the inductor L1 shown in the figure), the second end of the resistor R3 is connected to the gate of the switch tube Q1 and the first end of the resistor R4; the second end of the resistor R4 is connected to the collector of the switch tube Q2, the base of the switch tube Q2 is connected to the first end of the resistor R5 and the first end of the resistor R6, the second end of the resistor R5 is connected to the cathode of the diode DS4, the anode of the diode DS4 receives the input enable signal POW_EN, and the second end of the resistor R6 and the emitter of the switch tube Q2 are grounded GND.

[0055] In the embodiment of the present application, the switch tube Q1 is an NMOS tube, the switch tube Q2 is an NPN transistor, and the diode DS3 and the diode DS4 are Schottky diodes.

[0056] In the embodiment of the present application, the first voltage is 5V and the second voltage is 3.3V.

[0057] In the embodiment of the present application, the subsequent modules connected to the output end of the charge pump module 200 include: a discharge control module 310 and a charge control module 320. Figure 5 The circuit structure diagram of the discharge control module 310 is shown, and the discharge control module includes a diode D1, a diode D2, a diode DZ1, a switch tube Q5, a switch tube Q6, a switch tube Q7, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18 and a resistor R19.

[0058] Among them, the first end of the resistor R13 and the emitter of the switch tube Q5 are connected to the output end of the charge pump module 200 to receive the driving voltage DRV; the second end of the resistor R13 and the base of the switch tube Q5 are connected to the first end of the resistor R14, the second end of the resistor R14 is connected to the drain of the switch tube Q6, and the first end of the resistor R18 is connected to the second output end of the control device to receive the discharge control signal DSG; the second end of the resistor R18 is connected to the first end of the resistor R19 and the gate of the switch tube Q6, and the second end of the resistor R19 and the source of the switch tube Q6 are grounded.

[0059] The collector of the switch tube Q5 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the first end of the resistor R15, the second end of the resistor R15 is connected to the anode of the diode D2, the first end of the resistor R16 and the base of the switch tube Q7, the cathode of the diode D2 is connected to the emitter of the switch tube Q7, the cathode of the diode DZ1 and the second input end of the high-side charge and discharge switch to output the discharge drive signal DSG_DRV to the second input end of the high-side charge and discharge switch, and the collector of the switch tube Q7 is connected to the first end of the resistor R17, the second end of the resistor R16, the second end of the resistor R17 and the anode of the diode DZ1 is grounded GND.

[0060] Figure 6 The circuit structure diagram of the charging control module 320 is shown. The charging control module 320 includes a diode D3, a diode DZ2, a switch tube Q8, a switch tube Q9, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24 ​​and a resistor R25.

[0061] Among them, the first end of the resistor R22 and the emitter of the switch tube Q8 are connected to the output end of the charge pump module 200 to receive the driving voltage DRV; the base of the switch tube Q8 and the second end of the resistor R22 are connected to the first end of the resistor R23, the second end of the resistor R23 is connected to the drain of the switch tube Q9, the gate of the switch tube Q9 is connected to the first end of the resistor R24 ​​and the first end of the resistor R25, the second end of the resistor R24 ​​is connected to the first output end of the control device to receive the charging control signal CHG; the source of the switch tube Q9 and the second end of the resistor R25 are grounded.

[0062] The collector of the switch tube Q8 is connected to the first end of the resistor R21, the second end of the resistor R21 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the first end of the resistor R20, the cathode of the diode DZ2 and the first input end of the high-side charge and discharge switch to output the charging drive signal CHG_DRV to the first input end of the high-side charge and discharge switch, and the second end of the resistor R20 and the anode of the diode DZ2 are grounded.

[0063] Different from the prior art, the embodiment of the utility model utilizes the characteristic that the voltage across the capacitor cannot change suddenly, and achieves the purpose of doubling the input voltage through switch control and charging and discharging the capacitor, thereby obtaining the desired output voltage. It can achieve the purpose of driving multiple high-side NMOS tubes without designing a complex transformer, and at the same time, it can also replace the PMOS tube with an NMOS tube with lower on-resistance, reducing the cost of the transformer and MOS tube and the complexity of the peripheral circuit, and improving the working efficiency and driving ability of the circuit.

[0064] Based on the switch tube driving circuit provided in the above implementation manner, an energy storage power supply is provided, including the switch tube driving circuit as described in any of the above embodiments.

[0065] It should be noted that the preferred embodiments of the utility model are given in the specification and drawings of the utility model, but the utility model can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional restrictions on the content of the utility model. The purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the utility model; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the utility model.

Claims

1. A switch tube driving circuit, characterized in that: include: A step-down module, wherein an input end of the step-down module is connected to an input power source VDD2, and a level of a first output end of the step-down module changes under the control of a switch unit in the step-down module; A charge pump module, wherein the input end of the charge pump module is connected to an input power supply VDD1, the output end of the charge pump module is connected to a subsequent module, the first end of a cross-capacitor unit in the charge pump module receives a first input power supply voltage, the second end of the cross-capacitor unit is connected to a first output end of the step-down module, and the first end voltage of the cross-capacitor unit changes in response to a level jump between the first input power supply voltage and the first output end of the step-down module, so as to be output as a driving voltage by the output end of the charge pump module.

2. The circuit according to claim 1, characterized in that The charge pump module further includes a resistor R1, a capacitor C1, a capacitor C2, a diode DS1 and a diode DS2. The first end of the capacitor C1, the first end of the capacitor C2 and the anode of the diode DS1 are connected to the input power supply VDD1, the cathode of the diode DS1 is connected to the anode of the diode DS2 and the first end of the cross-connected capacitor unit, and the second end of the capacitor C1 and the second end of the capacitor C2 are connected to the cathode of the diode DS2; A first end of the resistor R1 is connected to the output end of the switch unit, and a second end of the resistor R1 is connected to the second end of the jumper capacitor unit.

3. The circuit according to claim 2, characterized in that The cross-connected capacitor unit includes a capacitor C3 and a capacitor C4. The first end of the capacitor C3 is connected to the second end of the resistor R1 , the second end of the capacitor C3 is connected to the first end of the capacitor C4 , and the second end of the capacitor C4 is connected to the cathode of the diode DS1 and the anode of the diode DS2 .

4. The circuit according to claim 1, characterized in that The step-down module further includes capacitor C5, capacitor C6, capacitor C8, capacitor C9, capacitor CE1, capacitor CE2, inductor L1, inductor L2 and resistor R11. The first end of the capacitor C5 and the first end of the inductor L1 are connected to the input power supply VDD2, the second end of the inductor L1 is connected to the first end of the capacitor CE1, the first end of the capacitor C6 and the input end of the switch unit, and the second end of the capacitor C5, the second end of the capacitor CE1 and the second end of the capacitor C6 are grounded; The first end of the resistor R11 and the first end of the inductor L2 are connected to the output end of the switch unit, the second end of the resistor R11 is connected to the first end of the capacitor C8, the second end of the inductor L2 is connected to the first end of the capacitor CE2 and the first end of the capacitor C9, and the second end of the capacitor C8, the second end of the capacitor CE2 and the second end of the capacitor C9 are grounded.

5. The circuit according to claim 4, characterized in that The switch unit includes a driving chip U1, a resistor R7, a resistor R8, a resistor R9, a resistor R10 and a capacitor C7. The input pin of the driving chip U1 is connected to the second end of the inductor L1, the frequency adjustment pin of the driving chip U1 is connected to the first end of the resistor R7, and the switch pin of the driving chip U1 is connected to the first end of the inductor L2 and the second end of the jumper capacitor unit; The feedback pin of the driving chip U1 is connected to the first end of the resistor R8, the first end of the capacitor C7 and the first end of the resistor R10, the second end of the resistor R8 and the second end of the capacitor C7 are connected to the second end of the inductor L2, and the current limiting pin of the driving chip U1 is connected to the first end of the resistor R9; A ground pin of the driving chip U1 , a second end of the resistor R7 , a second end of the resistor R9 , and a second end of the resistor R10 are grounded.

6. The circuit according to claim 4, characterized in that The switch unit includes a switch tube Q3 and a switch tube Q4. The drain of the switch tube Q3 is connected to the second end of the inductor L1, the source of the switch tube Q3 is connected to the drain of the switch tube Q4 and the second end of the jumper capacitor unit, and the gate of the switch tube Q3 receives a third control signal; The source of the switch tube Q4 is grounded, and the gate of the switch tube Q4 receives a fourth control signal.

7. The circuit according to claim 1, characterized in that Also includes: A voltage stabilizing module, wherein the input end of the voltage stabilizing module is connected to the second output end of the voltage reducing module, and the output end of the voltage stabilizing module is connected to a subsequent circuit; The step-down module is also used to convert the second input power supply voltage into the first output voltage; The voltage stabilizing module is used to convert the first output voltage into a second output voltage to power the subsequent circuit.

8. The circuit according to claim 1, characterized in that Also includes: An input module, wherein the power input terminal of the input module is connected to the input power supply VDD2, the output terminal of the input module is connected to the input terminal of the step-down module, and the signal input terminal of the input module receives an input enable signal; The input module is used to output the second input power supply voltage to the step-down module under the control of the input enable signal.

9. The circuit according to claim 7, characterized in that The voltage stabilizing module includes a voltage stabilizing chip U2, an inductor L3, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R12 and a diode LED1. Wherein, the first end of the inductor L3 is connected to the second output end of the buck module, the second end of the inductor L3 is connected to the first end of the capacitor C10, the first end of the capacitor C11 and the input pin of the voltage stabilizing chip U2, the output pin of the voltage stabilizing chip U2 is connected to the first end of the capacitor C12, the first end of the capacitor C13 and the first end of the resistor R12, and the second end of the resistor R12 is connected to the anode of the diode LED1; The ground pin of the voltage stabilizing chip U2, the second end of the capacitor C10, the second end of the capacitor C11, the second end of the capacitor C12, the second end of the capacitor C13 and the cathode of the diode LED1 are grounded.

10. An energy storage power supply, characterized in that: include; A switch tube driving circuit as described in any one of claims 1 to 9.

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