Push-pull power source circuit and drive chip

Abstract

A push-pull power source circuit and a drive chip. The push-pull power source circuit comprises a negative feedback module, a positive feedback module, a feedback collection module, a current source module and a switch module, wherein the switch module is configured to control the operating state of the positive feedback module, and the current source module is configured to provide electric energy to the feedback collection module and the switch module; the feedback collection module is configured to collect an output voltage of the positive feedback module or the negative feedback module to obtain a feedback voltage, or to configure the output voltage and a feedback voltage; and the positive feedback module is configured to regulate, on the basis of the feedback voltage, an output voltage that is output by the positive feedback module to increase, and the negative feedback module is configured to regulate, on the basis of the feedback voltage, the output voltage that is output by the negative feedback module to decrease.

Description

Push-pull power supply circuit and driving chip

[0001] The present application claims priority to the Chinese patent application No. 202411095625.0, filed on August 12, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power supply, for example, to a push-pull power supply circuit and a driving chip. BACKGROUND

[0003] With the continuous development of electronic information technology, the requirements for the power supply equipped for electronic products are also continuously improved. In order to meet the various needs of electronic products, it is necessary to equip stable power supply to ensure that electronic products can work stably under various conditions. However, the conventional power supply circuit has poor regulation ability for output voltage, and when the power supply circuit is disturbed by the external environment, the voltage output by the power supply circuit will be affected by the external environment, and stable output cannot be achieved. SUMMARY

[0004] The embodiments of the present application provide a push-pull power supply circuit and a driving chip to improve the regulation ability of the power supply circuit for the output voltage, thereby improving the anti-interference ability of the power supply circuit.

[0005] In a first aspect, the embodiments of the present application provide a push-pull power supply circuit, which comprises a negative feedback module, a positive feedback module, a feedback acquisition module, a current source module and a switch module; a first end of the negative feedback module and a first end of the positive feedback module are connected with a reference voltage input end; a second end of the negative feedback module and a second end of the positive feedback module are connected with a first end of the feedback acquisition module; a third end of the negative feedback module and a third end of the positive feedback module are connected with a second end of the feedback acquisition module and serve as an output end of the push-pull power supply circuit; a fourth end of the negative feedback module, a fourth end of the positive feedback module and a first end of the current source module are connected with a low-voltage power supply end; a fifth end of the negative feedback module and a second end of the current source module are connected; a third end of the current source module is connected with a third end of the feedback acquisition module; a fourth end of the feedback acquisition module is connected with a voltage regulation end; a fourth end of the current source module is connected with a first end of the switch module; a second end of the switch module and a fifth end of the positive feedback module are connected with a high-voltage power supply end; a third end of the switch module is connected with a sixth end of the positive feedback module; and a control end of the switch module is connected with a starting end; the switch module is configured to control a running state of the positive feedback module; the current source module is configured to provide electric energy for the feedback acquisition module and the switch module; the feedback acquisition module is configured to acquire a feedback voltage by collecting an output voltage of the positive feedback module or the negative feedback module, or to configure the output voltage and the feedback voltage; the positive feedback module is configured to adjust the output voltage to be increased according to the feedback voltage; and the negative feedback module is configured to adjust the output voltage to be decreased according to the feedback voltage.

[0006] Optionally, the negative feedback module comprises a first operational amplifier, a first PMOS tube, a first NMOS tube and a second NMOS tube; a positive input end of the first operational amplifier serves as the first end of the negative feedback module; a negative input end of the first operational amplifier serves as the second end of the negative feedback module; an output end of the first operational amplifier is connected with a gate of the first PMOS tube; a first power supply end of the first operational amplifier and a first pole of the first PMOS tube are connected and serve as the fourth end of the negative feedback module; a second power supply end of the first operational amplifier serves as the fifth end of the negative feedback module; a second pole of the first PMOS tube is connected with a first pole of the first NMOS tube, a gate of the first NMOS tube and a gate of the second NMOS tube; a second pole of the first NMOS tube and a second pole of the second NMOS tube are common; and a first pole of the second NMOS tube serves as the third end of the negative feedback module.

[0007] Optionally, the positive feedback module comprises a second operational amplifier, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a third NMOS transistor and a fourth NMOS transistor; a negative input end of the second operational amplifier is a first end of the positive feedback module, a positive input end of the second operational amplifier is a second end of the positive feedback module, an output end of the second operational amplifier is connected with a gate of the second PMOS transistor, a first pole of the second PMOS transistor is a fourth end of the positive feedback module, a second pole of the second PMOS transistor is connected with a first pole of the third NMOS transistor, a gate of the third NMOS transistor and a gate of the fourth NMOS transistor, a second pole of the third NMOS transistor and a second pole of the fourth NMOS transistor are common, a first pole of the third PMOS transistor and a first pole of the fourth PMOS transistor are connected and are a fifth end of the positive feedback module, a gate of the third PMOS transistor, a gate of the fourth PMOS transistor and a second pole of the third PMOS transistor are connected and are a sixth end of the positive feedback module, the second pole of the third PMOS transistor is connected with the first pole of the fourth NMOS transistor, and a second pole of the fourth PMOS transistor is a third end of the positive feedback module.

[0008] Optionally, the positive feedback module further comprises a fifth PMOS transistor; a gate of the fifth PMOS transistor is connected with a gate of the fourth PMOS transistor, a first pole of the fifth PMOS transistor is connected with a first pole of the fourth PMOS transistor, and a second pole of the fifth PMOS transistor is connected with a first pole of the third PMOS transistor and is a fifth end of the positive feedback module.

[0009] Optionally, the feedback collection module comprises a feedback voltage collection unit and a voltage adjustment unit; a first end of the feedback voltage collection unit and a first end of the voltage adjustment unit are connected and are a first end of the feedback collection module, a second end of the feedback voltage collection unit is a second end of the feedback collection module, a third end of the feedback voltage collection unit is a third end of the feedback collection module, and a second end of the voltage adjustment unit is a fourth end of the feedback collection module; the feedback voltage collection unit is configured to collect an output voltage of the positive feedback module or the negative feedback module to obtain a feedback voltage, and the voltage adjustment unit is configured to configure the output voltage of the positive feedback module or the negative feedback module and the feedback voltage.

[0010] Optionally, the feedback voltage acquisition unit comprises a first resistor, a first Zener diode, a sixth PMOS tube and a second resistor; a first end of the first resistor, a cathode of the first Zener diode and a first pole of the sixth PMOS tube are connected and serve as a second end of the feedback voltage acquisition unit, a second end of the first resistor, an anode of the first Zener diode and a gate of the sixth PMOS tube are connected and serve as a third end of the feedback voltage acquisition unit, a second pole of the sixth PMOS tube is connected with a first end of the second resistor, and a second end of the second resistor serves as a first end of the feedback voltage acquisition unit.

[0011] Optionally, the voltage regulation unit comprises a third resistor, a fourth resistor, a fifth resistor, a fifth NMOS tube, a sixth NMOS tube and a seventh NMOS tube; the voltage regulation end comprises a first regulation port, a second regulation port and a third regulation port; a first end of the third resistor and a first pole of the fifth NMOS tube are connected and serve as a first end of the voltage regulation unit, a second pole of the fifth NMOS tube, a first pole of the sixth NMOS tube and a second end of the third resistor are all connected with a first end of the fourth resistor, a second pole of the sixth NMOS tube, a first pole of the seventh NMOS tube and a second end of the fourth resistor are all connected with a first end of the fifth resistor, a second pole of the seventh NMOS tube and a second end of the fifth resistor are common, a gate of the fifth NMOS tube is connected with the first regulation port, a gate of the sixth NMOS tube is connected with the second regulation port and a gate of the seventh NMOS tube is connected with the third regulation port.

[0012] Optionally, the current source module comprises a current source, an eighth NMOS tube, a ninth NMOS tube and a tenth NMOS tube; a first end of the current source serves as a first end of the current source module, a second end of the current source, a first pole of the eighth NMOS tube, a gate of the eighth NMOS tube and a gate of the ninth NMOS tube are all connected with a gate of the tenth NMOS tube and serve as a second end of the current source module, a first pole of the tenth NMOS tube serves as a third end of the current source module, a first pole of the ninth NMOS tube serves as a fourth end of the current source module, a second pole of the eighth NMOS tube, a second pole of the ninth NMOS tube and a second pole of the tenth NMOS tube are common.

[0013] Optionally, the switch module comprises a seventh PMOS tube, a second Zener diode, a sixth resistor and an eighth PMOS tube; a gate of the seventh PMOS tube is used as a control terminal of the switch module, a first pole of the seventh PMOS tube is used as a first terminal of the switch module, a second pole of the seventh PMOS tube, an anode of the second Zener diode and a first terminal of the sixth resistor are all connected with a gate of the eighth PMOS tube, a cathode of the second Zener diode and a second terminal of the sixth resistor are all connected with a first pole of the eighth PMOS tube and are used as a second terminal of the switch module, and a second pole of the eighth PMOS tube is used as a third terminal of the switch module.

[0014] In a second aspect, the embodiments of the present application further provide a driving chip, which comprises the push-pull power supply circuit provided by any of the embodiments of the present application.

[0015] The push-pull power supply circuit provided by the embodiments of the present application can monitor the output voltage of the push-pull power supply circuit in real time through the feedback acquisition module, so that the negative feedback module can generate a pull-down capability to reduce the output voltage of the power supply circuit when the output voltage is too high, and the positive feedback module can generate a pull-up capability to increase the output voltage of the power supply circuit when the output voltage is too low. Thus, the feedback loop composed of the negative feedback module, the positive feedback module and the feedback acquisition module can improve the adjustment capability of the power supply circuit for the output voltage, and further improve the anti-interference capability of the power supply circuit. In addition, when the output voltage of the power supply circuit changes greatly, the output voltage and the feedback voltage are configured to be close to the voltage value that needs to be stabilized through the feedback acquisition module. Thus, the adjustment speed of the output voltage and the feedback voltage can be improved, the speed of stabilizing the output voltage and the feedback voltage can be improved, the adjustment capability of the power supply circuit for the output voltage can be further improved, and thus the anti-interference capability of the power supply circuit can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a structural schematic diagram of a push-pull power supply circuit provided by an embodiment of the present application;

[0017] FIG. 2 is a structural schematic diagram of another push-pull power supply circuit provided by an embodiment of the present application;

[0018] FIG. 3 is a structural schematic diagram of another push-pull power supply circuit provided by an embodiment of the present application;

[0019] FIG. 4 is a structural schematic diagram of a first operational amplifier or a second operational amplifier provided by an embodiment of the present application;

[0020] FIG. 5 is a structural schematic diagram of another push-pull power supply circuit provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The described embodiments can be the embodiments of part or all of the present application. Based on the embodiments in the present application, all other embodiments obtained by the skilled in the art without creative labor should be within the protection scope of the present application.

[0022] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0023] Fig. 1 is a structural schematic diagram of a push-pull power supply circuit provided by an embodiment of the present application, as shown in Fig. 1, the push-pull power supply circuit includes a negative feedback module 110, a positive feedback module 120, a feedback collection module 130, a current source module 140 and a switch module 150;

[0024] The first end of the negative feedback module 110 and the first end of the positive feedback module 120 are connected with a reference voltage input end VBG, the second end of the negative feedback module 110 and the second end of the positive feedback module 120 are connected with the first end of the feedback collection module 130, the third end of the negative feedback module 110 and the third end of the positive feedback module 120 are connected with the second end of the feedback collection module 130 and serve as an output end OUT of the push-pull power supply circuit, the fourth end of the negative feedback module 110, the fourth end of the positive feedback module 120 and the first end of the current source module 140 are connected with a low-voltage power supply end VCC, the fifth end of the negative feedback module 110 and the second end of the current source module 140 are connected, the third end of the current source module 140 is connected with the third end of the feedback collection module 130, the fourth end of the feedback collection module 130 is connected with a voltage regulation end T, the fourth end of the current source module 140 is connected with the first end of the switch module 150, the second end of the switch module 150 and the fifth end of the positive feedback module 120 are connected with a high-voltage power supply end VH, the third end of the switch module 150 is connected with the sixth end of the positive feedback module 120, and the control end of the switch module 150 is connected with an enabling end ENN;

[0025] The switch module 150 is configured to control the operation state of the positive feedback module 120, the current source module 140 is configured to provide power for the feedback collection module 130 and the switch module 150; the feedback collection module 130 is configured to collect the output voltage of the positive feedback module 120 or the negative feedback module 110 to obtain a feedback voltage, or to configure the output voltage and the feedback voltage; the positive feedback module 120 is configured to increase the output voltage according to the feedback voltage, and the negative feedback module 110 is configured to decrease the output voltage according to the feedback voltage.

[0026] According to the above connection relationship, the working principle of the push-pull power supply circuit is described: the feedback collection module 130 can monitor the output voltage of the push-pull power supply circuit in real time, collect the output voltage of the push-pull power supply circuit in real time to obtain a feedback voltage, and feed back the feedback voltage to the negative feedback module 110 and the positive feedback module 120. When the feedback voltage received by the negative feedback module 110 is greater than the reference voltage provided by the reference voltage input terminal VBG, the negative feedback module 110 will generate a pull-down capability, thereby reducing the output voltage of the power supply circuit; when the feedback voltage received by the positive feedback module 120 is less than the reference voltage provided by the reference voltage input terminal VBG, the positive feedback module 120 will generate a pull-up capability, thereby increasing the output voltage of the power supply circuit. The low-voltage power supply terminal VCC can provide low voltage for the negative feedback module 110, the current source module 140 and the positive feedback module 120, so that the negative feedback module 110 and the positive feedback module 120 can work normally, and the current source module 140 can provide power for the switch module 150 and the feedback collection module 130. The high-voltage power supply terminal VH can provide high voltage for the switch module 150 and the positive feedback module 120, so that the positive feedback module 120 can output high voltage when working normally, and the switch module 150 can control the positive feedback module 120 to normally operate or stop operating under the control of the start terminal ENN. In addition, the voltage regulation terminal T can provide a configuration signal to adjust the size of the resistance of the feedback collection module 130, so as to configure the output voltage and the feedback voltage, so that the output voltage and the feedback voltage are close to the required stable voltage value, thereby improving the adjustment speed of the output voltage and the feedback voltage, and improving the speed of stabilizing the output voltage and the feedback voltage.

[0027] The push-pull power supply circuit provided by the embodiment of the present application can monitor the output voltage of the push-pull power supply circuit in real time through the feedback acquisition module 130, so that the negative feedback module 110 can generate a pull-down capability to reduce the output voltage of the power supply circuit when the output voltage is too high, and the positive feedback module 120 can generate a pull-up capability to increase the output voltage of the power supply circuit when the output voltage is too low. Thus, the feedback loop composed of the negative feedback module 110, the positive feedback module 120 and the feedback acquisition module 130 can improve the adjustment capability of the power supply circuit for the output voltage, and further improve the anti-interference capability of the power supply circuit. In addition, when the output voltage of the power supply circuit changes greatly, the output voltage and the feedback voltage are configured to be close to the voltage value that needs to be stabilized through the feedback acquisition module 130. Thus, the adjustment speed of the output voltage and the feedback voltage can be improved, the speed of stabilizing the output voltage and the feedback voltage can be improved, the adjustment capability of the power supply circuit for the output voltage can be further improved, and thus the anti-interference capability of the power supply circuit can be further improved.

[0028] On the basis of the above embodiment, optionally, FIG. 2 is a structural schematic diagram of another push-pull power supply circuit provided by the embodiment of the present application. As shown in FIG. 1 and FIG. 2, the negative feedback module 110 includes a first operational amplifier OP1, a first PMOS tube P1, a first NMOS tube M1 and a second NMOS tube M2.

[0029] The positive input end of the first operational amplifier OP1 is the first end of the negative feedback module 110, the negative input end of the first operational amplifier OP1 is the second end of the negative feedback module 110, the output end of the first operational amplifier OP1 is connected with the gate of the first PMOS tube P1, the first power supply end of the first operational amplifier OP1 is connected with the first pole of the first PMOS tube P1 and serves as the fourth end of the negative feedback module 110, the second power supply end of the first operational amplifier OP1 serves as the fifth end of the negative feedback module 110, the second pole of the first PMOS tube P1 is connected with the first pole of the first NMOS tube M1, the gate of the first NMOS tube M1 and the gate of the second NMOS tube M2, the second pole of the first NMOS tube M1 and the second pole of the second NMOS tube M2 are common, and the first pole of the second NMOS tube M2 serves as the third end of the negative feedback module 110.

[0030] Specifically, the positive input end of the first operational amplifier OP1 is connected with the reference voltage input end VBG, the negative input end of the first operational amplifier OP1 is connected with the first end of the feedback acquisition module 130, the first power supply end of the first operational amplifier OP1 and the first pole of the first PMOS tube P1 are both connected with the low-voltage power supply end VCC, the second power supply end of the first operational amplifier OP1 is connected with the second end of the current source module 140, and the first pole of the second NMOS tube M2 and the third end of the positive feedback module 120 are both connected with the second end of the feedback acquisition module 130 and serve as the output end OUT of the push-pull power supply circuit.

[0031] According to the connection relationship, the working principle of the negative feedback module 110 is described as follows: the feedback voltage output by the first end of the feedback collection module 130 is output to the negative input end of the first operational amplifier OP1. If the feedback voltage input to the negative input end of the first operational amplifier OP1 is greater than the reference voltage provided by the reference voltage input end VBG, the output voltage of the first operational amplifier OP1 decreases, the current of the first PMOS increases, the gate potential of the first NMOS M1 and the gate potential of the second NMOS M2 increase, the current of the current mirror composed of the first NMOS M1 and the second NMOS M2 increases, thereby generating a pull-down capability, and the output end of the power supply circuit is grounded through the second NMOS M2, thereby reducing the output voltage of the push-pull power supply circuit.

[0032] On the basis of the above embodiment, optionally, with reference to FIG. 2, the positive feedback module 120 includes a second operational amplifier OP2, a second PMOS P2, a third PMOS P3, a fourth PMOS P4, a third NMOS M3, and a fourth NMOS M4.

[0033] The negative input end of the second operational amplifier OP2 is the first end of the positive feedback module 120, the positive input end of the second operational amplifier OP2 is the second end of the positive feedback module 120, the output end of the second operational amplifier OP2 is connected with the gate of the second PMOS P2, the first pole of the second PMOS P2 is the fourth end of the positive feedback module 120, the second pole of the second PMOS P2 is connected with the first pole of the third NMOS M3, the gate of the third NMOS M3, and the gate of the fourth NMOS M4, the second pole of the third NMOS M3 and the second pole of the fourth NMOS M4 are grounded, the first pole of the third PMOS P3 and the first pole of the fourth PMOS P4 are connected and serve as the fifth end of the positive feedback module 120, the gate of the third PMOS P3, the gate of the fourth PMOS P4, and the second pole of the third PMOS P3 are connected and serve as the sixth end of the positive feedback module 120, the second pole of the third PMOS P3 and the first pole of the fourth NMOS M4 are connected, and the second pole of the fourth PMOS P4 serves as the third end of the positive feedback module 120.

[0034] Specifically, the negative input terminal of the second operational amplifier OP2 is connected with the reference voltage input terminal VBG, the positive input terminal of the second operational amplifier OP2 is connected with the first end of the feedback collection module 130, the first pole of the second PMOS P2 is connected with the low-voltage power supply terminal VCC, the first poles of the third PMOS P3 and the fourth PMOS P4 are both connected with the high-voltage power supply terminal VH, the gate pole of the third PMOS P3, the gate pole of the fourth PMOS P4 and the second pole of the third PMOS P3 are all connected with the third end of the switch module 150, the second pole of the fourth PMOS P4 is connected with the second end of the feedback collection module 130 and serves as the output terminal OUT of the push-pull power supply circuit.

[0035] According to the above connection relationship, the working principle of the positive feedback module 120 is described as follows: the feedback voltage output by the first end of the feedback collection module 130 is output to the positive input terminal of the second operational amplifier OP2. If the feedback voltage input to the positive input terminal of the second operational amplifier OP2 is less than the reference voltage provided by the reference voltage input terminal VBG, the output voltage of the second operational amplifier OP2 decreases, the current of the second PMOS increases, the gate potential of the third NMOS M3 and the gate potential of the fourth NMOS M4 increase, the current of the current mirror composed of the third NMOS M3 and the fourth NMOS M4 increases, the current of the current mirror composed of the third PMOS P3 and the fourth PMOS P4 increases, thereby generating the pull-up ability, the output terminal of the power supply circuit is turned on through the fourth PMOS P4 and the high-voltage power supply terminal VH, and thus the output voltage of the push-pull power supply circuit is improved.

[0036] On the basis of the above embodiment, optionally, FIG. 3 is a structural schematic diagram of another push-pull power supply circuit provided by the embodiment of the application. As shown in FIG. 3, the positive feedback module 120 further comprises a fifth PMOS P5;

[0037] The gate pole of the fifth PMOS P5 is connected with the gate pole of the fourth PMOS P4, the first pole of the fifth PMOS P5 is connected with the first pole of the fourth PMOS P4, the second pole of the fifth PMOS P5 and the first pole of the third PMOS P3 are connected and serve as the fifth end of the positive feedback module 120.

[0038] The back-to-back structure composed of the fifth PMOS P5 and the fourth PMOS P4 can prevent the external high voltage from flowing into the high-voltage power supply terminal VH when the output terminal OUT of the push-pull power supply circuit is short-circuited with a higher external high-voltage power supply.

[0039] Specifically, the cathode of the parasitic diode of the fifth PMOS tube P5 and the cathode of the parasitic diode of the fourth PMOS tube P4 are connected, when the output end OUT of the push-pull power supply circuit is short-circuited with an external higher high-voltage power supply, the external high voltage flowing through the output end OUT of the push-pull power supply circuit cannot flow into the high-voltage power supply end VH, thereby further improving the reliability of the push-pull power supply circuit.

[0040] On the basis of the above-mentioned embodiment, optionally, the structure of the first operational amplifier OP1 and the structure of the second operational amplifier OP2 are the same. Fig. 4 is a structural schematic diagram of the first operational amplifier OP1 or the second operational amplifier OP2 provided in the embodiment of the application. As shown in Fig. 4, the eleventh NMOS tube M11 and the twelfth NMOS tube M12 constitute a differential input pair, the ninth PMOS tube P9 and the tenth PMOS tube P10 form a current mirror load pair, the eleventh PMOS tube P11 and the twelfth PMOS tube PM12 form a current mirror load pair, and the thirteenth NMOS tube M13 and the fourteenth NMOS tube M14 form a current mirror load pair. The operational amplifier with the structure shown in Fig. 4 can provide high speed and wide output range.

[0041] It should be noted that: Fig. 4 only exemplarily shows the structure of an operational amplifier, and the present application does not make specific limitation thereon, and other structures of operational amplifiers can be selected according to specific requirements.

[0042] On the basis of the above-mentioned embodiment, optionally, Fig. 5 is a structural schematic diagram of another push-pull power supply circuit provided in the embodiment of the application. As shown in Fig. 5, the feedback collection module 130 includes a feedback voltage collection unit 131 and a voltage adjustment unit 132;

[0043] The first end of the feedback voltage collection unit 131 and the first end of the voltage adjustment unit 132 are connected and serve as the first end of the feedback collection module 130, the second end of the feedback voltage collection unit 131 serves as the second end of the feedback collection module 130, the third end of the feedback voltage collection unit 131 serves as the third end of the feedback collection module 130, and the second end of the voltage adjustment unit 132 serves as the fourth end of the feedback collection module 130;

[0044] The feedback voltage collection unit 131 is configured to collect the output voltage of the positive feedback module 120 or the negative feedback module 110 to obtain a feedback voltage, and the voltage adjustment unit 132 is configured to configure the output voltage of the positive feedback module 120 or the negative feedback module 110 and the feedback voltage.

[0045] Specifically, with continued reference to Fig. 3, the feedback voltage collection unit 131 includes a first resistor R1, a first Zener diode Z1, a sixth PMOS tube P6, and a second resistor R2;

[0046] The first end of the first resistor R1 and the cathode of the first Zener diode Z1 and the first pole of the sixth PMOS tube P6 are connected, and serve as the second end of the feedback voltage acquisition unit 131. The second end of the first resistor R1, the anode of the first Zener diode Z1 and the gate of the sixth PMOS tube P6 are connected, and serve as the third end of the feedback voltage acquisition unit 131. The second pole of the sixth PMOS tube P6 is connected with the first end of the second resistor R2. The second end of the second resistor R2 serves as the first end of the feedback voltage acquisition unit 131.

[0047] The first end of the first resistor R1 and the cathode of the first Zener diode Z1, the first pole of the sixth PMOS tube P6 and the third end of the negative feedback module 110 are connected with the third end of the positive feedback module 120. The second end of the first resistor R1, the anode of the first Zener diode Z1 and the gate of the sixth PMOS tube P6 are connected with the third end of the current source module 140. The second end of the second resistor R2 is connected with the first end of the voltage adjustment unit 132. The current generated by the third end of the current source module 140 flows through the first Zener diode Z1 to control the sixth PMOS tube P6 to be turned on, so as to realize the enablement of the sixth PMOS tube P6.

[0048] Specifically, with continuous reference to FIG. 3, the voltage adjustment unit 132 comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth NMOS tube M5, a sixth NMOS tube M6 and a seventh NMOS tube M7.

[0049] The voltage adjustment end T comprises a first adjustment port T1, a second adjustment port T2 and a third adjustment port T3.

[0050] The first end of the third resistor R3 and the first pole of the fifth NMOS tube M5 are connected, and serve as the first end of the voltage adjustment unit 132. The second pole of the fifth NMOS tube M5, the first pole of the sixth NMOS tube M6 and the second end of the third resistor R3 are connected with the first end of the fourth resistor R4. The second pole of the sixth NMOS tube M6, the first pole of the seventh NMOS tube M7 and the second end of the fourth resistor R4 are connected with the first end of the fifth resistor R5. The second pole of the seventh NMOS tube M7 and the second end of the fifth resistor R5 are common. The gate of the fifth NMOS tube M5 is connected with the first adjustment port T1. The gate of the sixth NMOS tube M6 is connected with the second adjustment port T2. The gate of the seventh NMOS tube M7 is connected with the third adjustment port T3.

[0051] Specifically, the on-off state of the fifth NMOS M5 can be controlled through the first adjusting port T1, and then the connection state of the third resistor R3 and the second resistor R2 is controlled; the on-off state of the sixth NMOS M6 can be controlled through the second adjusting port T2, and then the connection state of the fourth resistor R4 and the second resistor R2 is controlled; the on-off state of the seventh NMOS M7 can be controlled through the third adjusting port T3, and then the connection state of the fifth resistor R5 and the second resistor R2 is controlled. Thus, by adjusting the on-off state of the fifth NMOS M5, the sixth NMOS M6 and the seventh NMOS M7, the voltage division ratio of the output end of the push-pull power supply circuit and the second end of the second resistor R2 is changed, so as to adjust the size of the output voltage and the feedback voltage, and the configuration of the output voltage and the feedback voltage is realized.

[0052] On the basis of the above-mentioned embodiment, optionally, with reference to FIG. 3, the current source module 140 comprises a current source IB, an eighth NMOS M8, a ninth NMOS M9 and a tenth NMOS M10.

[0053] The first end of the current source IB is the first end of the current source module 140, the second end of the current source IB, the first pole of the eighth NMOS M8, the gate of the eighth NMOS M8 and the gate of the ninth NMOS M9 are connected with the gate of the tenth NMOS M10, and are the second end of the current source module 140, the first pole of the tenth NMOS M10 is the third end of the current source module 140, the first pole of the ninth NMOS M9 is the fourth end of the current source module 140, and the second pole of the eighth NMOS M8, the second pole of the ninth NMOS M9 and the second pole of the tenth NMOS M10 are grounded.

[0054] The first end of the current source IB is connected with the low-voltage power supply end VCC, the second end of the current source IB, the first pole of the eighth NMOS M8, the gate of the eighth NMOS M8, the gate of the ninth NMOS M9 and the gate of the tenth NMOS M10 are connected with the fifth end of the negative feedback module 110, the first pole of the tenth NMOS M10 is connected with the third end of the feedback acquisition module 130, and the first pole of the ninth NMOS M9 is connected with the first end of the switch module 150. Specifically, the voltage output by the first pole of the tenth NMOS M10 is set to provide power for the feedback acquisition module 130, and the current output by the first pole of the ninth NMOS M9 is set to provide power for the switch module 150.

[0055] On the basis of the above-mentioned embodiment, optionally, the switch module 150 comprises a seventh PMOS P7, a second Zener diode Z2, a sixth resistor R6 and an eighth PMOS P8.

[0056] The gate of the seventh PMOS P7 is connected with the control end of the switch module 150, the first pole of the seventh PMOS P7 is connected with the first end of the switch module 150, the second pole of the seventh PMOS P7, the anode of the second Zener diode Z2 and the first end of the sixth resistor R6 are connected with the gate of the eighth PMOS P8, the cathode of the second Zener diode Z2 and the second end of the sixth resistor R6 are connected with the first pole of the eighth PMOS P8, and the first pole of the eighth PMOS P8 is connected with the second end of the switch module 150, and the second pole of the eighth PMOS P8 is connected with the third end of the switch module 150.

[0057] The gate of the seventh PMOS P7 is connected with the control end of the switch module 150, the first pole of the seventh PMOS P7 is connected with the first end of the switch module 150, the second pole of the seventh PMOS P7, the anode of the second Zener diode Z2 and the first end of the sixth resistor R6 are connected with the gate of the eighth PMOS P8, the cathode of the second Zener diode Z2 and the second end of the sixth resistor R6 are connected with the first pole of the eighth PMOS P8, and the first pole of the eighth PMOS P8 is connected with the second end of the switch module 150, and the second pole of the eighth PMOS P8 is connected with the third end of the switch module 150.

[0058] Specifically, the start end ENN controls the on-off state of the seventh PMOS P7, so as to control the on-off state of the eighth PMOS P8, and then controls the running state of the positive feedback module 120. For example, if the start end ENN provides low voltage, the seventh PMOS P7 is turned on, so that the gate potential of the eighth PMOS P8 is low voltage, the eighth PMOS P8 is turned on, so that the gate potential of the fourth PMOS P4 and the third PMOS P3 is high voltage, the fourth PMOS P4 and the third PMOS P3 are not turned on, and thus the positive feedback module 120 stops running. If the start end ENN provides high voltage, the seventh PMOS P7 is not turned on, so that the gate potential of the eighth PMOS P8 is pulled up to high voltage by the sixth resistor R6, the eighth PMOS P8 is not turned on, so that the gate potential of the fourth PMOS P4 and the third PMOS P3 is pulled down to low voltage by the fourth NMOS M4, the fourth PMOS P4 and the third PMOS P3 are turned on, and thus the positive feedback module 120 normally runs.

[0059] The application further provides a driving chip, which comprises the push-pull power supply circuit provided by any of the embodiments of the application, and thus has the beneficial effects of the push-pull power supply circuit provided by any of the embodiments of the application, which will not be repeated here.

Claims

1. A push-pull power supply circuit, comprising a negative feedback module, a positive feedback module, a feedback acquisition module, a current source module and a switch module; a first end of the negative feedback module and a first end of the positive feedback module are connected with a reference voltage input end, a second end of the negative feedback module and a second end of the positive feedback module are connected with a first end of the feedback acquisition module, a third end of the negative feedback module and a third end of the positive feedback module are connected with a second end of the feedback acquisition module and serve as an output end of the push-pull power supply circuit, a fourth end of the negative feedback module, a fourth end of the positive feedback module and a first end of the current source module are connected with a low-voltage power supply end, a fifth end of the negative feedback module and a second end of the current source module are connected, a third end of the current source module is connected with a third end of the feedback acquisition module, a fourth end of the feedback acquisition module is connected with a voltage regulation end, a fourth end of the current source module is connected with a first end of the switch module, a second end of the switch module and a fifth end of the positive feedback module are connected with a high-voltage power supply end, a third end of the switch module is connected with a sixth end of the positive feedback module, and a control end of the switch module is connected with a starting end; the switch module is configured to control the operating state of the positive feedback module, the current source module is configured to provide electric energy for the feedback acquisition module and the switch module, the feedback acquisition module is configured to acquire a feedback voltage from the output voltage of the positive feedback module or the negative feedback module or to configure the output voltage and the feedback voltage, and the positive feedback module is configured to increase the output voltage according to the feedback voltage, and the negative feedback module is configured to decrease the output voltage according to the feedback voltage.

2. The push-pull power supply circuit of claim 1, wherein, the negative feedback module comprises a first operational amplifier, a first PMOS transistor, a first NMOS transistor and a second NMOS transistor; a positive input end of the first operational amplifier serves as the first end of the negative feedback module, a negative input end of the first operational amplifier serves as the second end of the negative feedback module, an output end of the first operational amplifier is connected with a gate of the first PMOS transistor, a first power supply end of the first operational amplifier and a first pole of the first PMOS transistor are connected and serve as the fourth end of the negative feedback module, a second power supply end of the first operational amplifier serves as the fifth end of the negative feedback module, a second pole of the first PMOS transistor is connected with a first pole of the first NMOS transistor, a gate of the first NMOS transistor and a gate of the second NMOS transistor, a second pole of the first NMOS transistor and a second pole of the second NMOS transistor are common, and a first pole of the second NMOS transistor serves as the third end of the negative feedback module.

3. The push-pull power supply circuit of claim 1, wherein, the positive feedback module comprises a second operational amplifier, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a third NMOS transistor and a fourth NMOS transistor. The negative input end of the second operational amplifier is the first end of the positive feedback module, the positive input end of the second operational amplifier is the second end of the positive feedback module, the output end of the second operational amplifier is connected with the gate of the second PMOS tube, the first pole of the second PMOS tube is the fourth end of the positive feedback module, the second pole of the second PMOS tube is connected with the first pole of the third NMOS tube, the gate of the third NMOS tube and the gate of the fourth NMOS tube, the second pole of the third NMOS tube and the second pole of the fourth NMOS tube are common, the first pole of the third PMOS tube and the first pole of the fourth PMOS tube are connected and are the fifth end of the positive feedback module, the gate of the third PMOS tube, the gate of the fourth PMOS tube and the second pole of the third PMOS tube are connected and are the sixth end of the positive feedback module, the second pole of the third PMOS tube is connected with the first pole of the fourth NMOS tube, and the second pole of the fourth PMOS tube is the third end of the positive feedback module.

4. The push-pull power supply circuit according to claim 3, wherein the positive feedback module further comprises a fifth PMOS tube. The gate of the fifth PMOS tube is connected with the gate of the fourth PMOS tube, the first pole of the fifth PMOS tube is connected with the first pole of the fourth PMOS tube, and the second pole of the fifth PMOS tube is connected with the first pole of the third PMOS tube and is the fifth end of the positive feedback module.

5. The push-pull power supply circuit of claim 1, wherein, The feedback collection module comprises a feedback voltage collection unit and a voltage regulation unit. The first end of the feedback voltage collection unit and the first end of the voltage regulation unit are connected and are the first end of the feedback collection module, the second end of the feedback voltage collection unit is the second end of the feedback collection module, the third end of the feedback voltage collection unit is the third end of the feedback collection module, and the second end of the voltage regulation unit is the fourth end of the feedback collection module. The feedback voltage collection unit is configured to collect the output voltage of the positive feedback module or the negative feedback module to obtain a feedback voltage, and the voltage regulation unit is configured to configure the output voltage of the positive feedback module or the negative feedback module and the feedback voltage.

6. The push-pull power supply circuit of claim 5, wherein, The feedback voltage collection unit comprises a first resistor, a first Zener diode, a sixth PMOS tube and a second resistor. The first end of the first resistor, the cathode of the first Zener diode and the first pole of the sixth PMOS tube are connected and are the second end of the feedback voltage collection unit, the second end of the first resistor, the anode of the first Zener diode and the gate of the sixth PMOS tube are connected and are the third end of the feedback voltage collection unit, the second pole of the sixth PMOS tube is connected with the first end of the second resistor, and the second end of the second resistor is the first end of the feedback voltage collection unit.

7. The push-pull power supply circuit of claim 5, wherein, The voltage regulating unit comprises a third resistor, a fourth resistor, a fifth resistor, a fifth NMOS tube, a sixth NMOS tube and a seventh NMOS tube; The voltage regulating end comprises a first regulating port, a second regulating port and a third regulating port; The first end of the third resistor and the first pole of the fifth NMOS tube are connected and serve as the first end of the voltage regulating unit, the second pole of the fifth NMOS tube, the first pole of the sixth NMOS tube and the second end of the third resistor are all connected with the first end of the fourth resistor, the second pole of the sixth NMOS tube, the first pole of the seventh NMOS tube and the second end of the fourth resistor are all connected with the first end of the fifth resistor, the second pole of the seventh NMOS tube and the second end of the fifth resistor are common, the gate of the fifth NMOS tube is connected with the first regulating port, the gate of the sixth NMOS tube is connected with the second regulating port and the gate of the seventh NMOS tube is connected with the third regulating port.

8. The push-pull power supply circuit of claim 1, wherein, The current source module comprises a current source, an eighth NMOS tube, a ninth NMOS tube and a tenth NMOS tube; The first end of the current source serves as the first end of the current source module, the second end of the current source, the first pole of the eighth NMOS tube, the gate of the eighth NMOS tube and the gate of the ninth NMOS tube are all connected with the gate of the tenth NMOS tube and serve as the second end of the current source module, the first pole of the tenth NMOS tube serves as the third end of the current source module, the first pole of the ninth NMOS tube serves as the fourth end of the current source module, the second pole of the eighth NMOS tube, the second pole of the ninth NMOS tube and the second pole of the tenth NMOS tube are common.

9. The push-pull power supply circuit of claim 1, wherein, The switch module comprises a seventh PMOS tube, a second Zener diode, a sixth resistor and an eighth PMOS tube; The gate of the seventh PMOS tube serves as the control end of the switch module, the first pole of the seventh PMOS tube serves as the first end of the switch module, the second pole of the seventh PMOS tube, the anode of the second Zener diode and the first end of the sixth resistor are all connected with the gate of the eighth PMOS tube, the cathode of the second Zener diode and the second end of the sixth resistor are all connected with the first pole of the eighth PMOS tube and serve as the second end of the switch module, the second pole of the eighth PMOS tube serves as the third end of the switch module.

10. A driving chip comprising the push-pull power supply circuit of any one of claims 1-9.

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