CN218335758U

CN218335758U - High-power switching power supply with voltage stabilizing function

Info

Publication number: CN218335758U
Application number: CN202221814176.7U
Authority: CN
Inventors: 邱星语; 邱海军
Original assignee: Kunming Xinlei Electronic Technology Co ltd
Current assignee: Kunming Xinlei Electronic Technology Co ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2023-01-17
Anticipated expiration: 2032-07-08

Abstract

The utility model relates to a switching power supply technical field, particularly, relate to a high-power switching power supply with steady voltage function, the VIN end respectively with LD0 voltage stabilizing module, triode is connected, the VCC end is connected with LD0 voltage stabilizing module, the CP end, the CN end, the VP end is connected with the charge pump respectively, the CTRL end is connected with logic control unit, the EN end, the enabling module, logic control unit connects gradually, the OVP end is connected with operational amplifier COM's non inverting input end, the benchmark module is connected with operational amplifier COM's reverse input end, operational amplifier COM's output, the excess temperature protection module, the undervoltage module is connected with logic control unit respectively, the charge pump, triode one, logic control unit is connected with the driver respectively, logic control unit is connected with triode MN1, triode one respectively with resistance R1, output VOUT is connected, resistance R1 is connected with triode MN1, triode MN1 ground connection, the OVP end, GND, output VOUT connects gradually.

Description

High-power switching power supply with voltage stabilizing function

Technical Field

The utility model relates to a switching power supply technical field particularly, relates to a high-power switching power supply with steady voltage function.

Background

With the market popularity of various portable electronic products such as smart phones and smart watches, people have higher demands on the electronic equipment with extremely fast charging, and therefore, high-power switching power supplies have come to the fore. However, currently, the following problems are derived from the high power switching power supply: the influence of low-bounce noise of the system is easily increased, so that the design of a relevant correction circuit is needed in the follow-up process of the chip, the design complexity of the chip is increased, and the cost is increased. Based on this, in order to overcome the above problems, we have designed a high power switching power supply with a voltage stabilizing function.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-power switching power supply with steady voltage function, it is used for solving above-mentioned technical problem.

The embodiment of the utility model discloses a realize through following technical scheme:

a high-power switching power supply with voltage stabilizing function comprises: the device comprises a VIN end, a VCC end, a CP end, a CN end, a VP end, a CTRL end, an EN end, an OVP end, an LD0 voltage stabilizing module, a charge pump, an enabling module, a reference module, an operational amplifier COM, a logic control unit, a GND, a driver, a first triode, a resistor R1, a triode MN1, an over-temperature protection module, an under-voltage latch module and an output end VOUT which are connected in sequence; the VIN end is connected with the LD0 voltage stabilizing module and the collector of a triode I respectively, the VCC end is connected with the LD0 voltage stabilizing module, the CP end, the CN end and the VP end are connected with one end of the charge pump respectively, the CTRL end is connected with the logic control unit, the EN end, the enable module and the logic control unit are connected in sequence, the OVP end is connected with the non-inverting input end of the operational amplifier COM, the reference module is connected with the inverting input end of the operational amplifier COM, the output end of the operational amplifier COM, the over-temperature protection module and the latch module are connected with the logic control unit respectively, the other end of the charge pump, the base of the triode I and the logic control unit are connected with the driver respectively, the logic control unit is connected with the base of the triode MN1, the emitter of the triode I is connected with one end of the resistor R1 and the output end VOUT respectively, the other end of the resistor R1 is connected with the collector of the triode MN1, the emitter of the triode MN1 is grounded, and the P end, GND and the output end VOUT are connected in sequence.

Optionally, the charge pump includes a switch S1, a switch S2, a capacitor C, a switch S3, and a switch S4; supply voltage is connected respectively to switch S1 'S one end, switch S2' S one end, switch S1 'S the other end, switch S3' S one end respectively with electric capacity C 'S one end is connected, switch S2' S the other end, switch S4 'S one end respectively with electric capacity C' S the other end is connected, output voltage is connected to switch S3 'S the other end, switch S4' S the other end ground connection.

Optionally, the LD0 voltage stabilizing module includes: the circuit comprises a starting circuit, a reference circuit, an operational amplifier EA, a triode II, a compensation network and a divider resistor; the starting circuit, the reference circuit and the reverse input end of the operational amplifier EA are connected in sequence; the non-inverting input end of the operational amplifier EA is connected with the compensation network; the compensation network is connected with the divider resistor; the divider resistor is connected with an emitting electrode of the second triode and is connected with a power supply voltage; the output end of the operational amplifier EA is connected with the base electrode of the triode II; and the collector of the second triode is connected with the input voltage.

Optionally, the starting circuit, the reference circuit, the compensation network, and the voltage dividing resistor are grounded respectively.

The utility model discloses technical scheme has following advantage and beneficial effect at least:

this embodiment has utilized the extremely low N type MOSFET of on-resistance as linear switching power supply's core device, can realize the quick response to outside digital modulation signal, and is different with the connected mode of power tube in traditional switch, and this switching power supply power tube receives input voltage at the source end, at drain terminal output voltage, has wide input, powerful advantage, and in addition, the power tube of low on-resistance can greatly reduce the loss of system, improves job stabilization nature.

Drawings

Fig. 1 is a schematic structural diagram of a high-power switching power supply with a voltage stabilizing function according to the present invention;

fig. 2 is a schematic diagram of a charge pump provided by the present invention;

fig. 3 is a topology structure diagram of the LD0 voltage stabilizing module provided by the present invention;

fig. 4 is a topology structure diagram of the reference circuit provided by the present invention;

fig. 5 is a topology structure diagram of the over-temperature protection module provided by the present invention;

fig. 6 is a topological structure diagram of the overvoltage protection module provided by the present invention;

fig. 7 is a topology structure diagram of an enable module provided by the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

As shown in fig. 1, the present invention provides one of the embodiments: a high-power switching power supply with voltage stabilizing function comprises: the device comprises an enabling module, a reference module, a charge pump, an internal LD0 voltage stabilizing module, an over-temperature protection module, an over-voltage protection module, an under-voltage latch module and a logic control unit. An input pin VIN is connected with a source end of a power tube, and a drain end of the power tube is an output pin V of the chip _OUT The situation of the high-power switching power supply application is that when the load current is not zero, the current flows from VIN to VOUT without considering other functional modules in the system. The external input voltage VIN of the switching power supply is converted into the stable power supply voltage required by the functional module, so that the stability of the functional module is improved, and further the stability of the functional module is improvedThe overall stability of the linear switching power supply. The switch control signal of the high-power switch power supply is mainly controlled by an enable pin EN, an input voltage signal VIN is modulated by a modulation signal CTRL which is externally input, and a signal which is subjected to linear modulation is output by a VOUT pin. The output signal may be either a stable dc voltage or a high frequency switching signal, depending on the modulation frequency of the externally input modulation signal. The amplitude of the output signal is determined by the input voltage, and the output voltage is approximately equal to the input voltage.

As shown in fig. 2, a fixed potential difference is formed between the capacitor plates by controlling the opening and closing of the switch, and the output capacitor VOUT is the sum of the input voltage VCC and the voltage difference across the capacitor C, thereby realizing voltage multiplication. The A and XA voltage signals are synchronous clock signals with equal voltage and opposite directions. When A is high level, XA is low level, the switches S1 and S4 are closed, the switches S2 and S3 are opened, VCC charges the capacitor C through a path formed by the switches S1 and S4, and the potential difference between two polar plates of the capacitor is VCC. When A is low level, XA is high level, at this time, the switches S2 and S3 are closed, the switches S1 and S4 are opened, VOUT outputs superposed voltage signals of VCC voltage and voltage difference on the capacitor C, namely, the charge pump technology can realize the effect of voltage multiplication.

As shown in fig. 3, the series linear regulator used in this embodiment generally includes a start circuit, a bias circuit, a reference circuit, an error amplifier, a power tube, and a voltage dividing resistor network. VREF refers to 1.2V reference voltage, VIN refers to input voltage of LD0 system, VCC refers to output voltage of LD0, and VFB refers to feedback voltage after voltage division and compensation of output voltage VCC. Because the input voltage range of the switching power supply is large, and the voltage VIN received by the source end of the LD0 power tube is probably a high-voltage signal, a high-voltage resistant device is selected for the selection of the power tube. In addition, the principle of realizing the voltage stabilization output by the LD0 mainly depends on a negative feedback working mechanism.

As shown in fig. 4, the module is mainly composed of two parts, namely a starting circuit and a bandgap reference generating circuit. The starting circuit is composed of MP4 and MP5, when the reference does not start the work, the current flowing through MP1, MP2 and MP3 is equal to zero. The bias current IB flows from the drain terminal of MP4, and the drain terminal of MP5 is connected to the NMOS gate terminal in the reference working circuit, i.e. the potential at point A in FIG. 4. Firstly, in the process that a power supply VCC _ BG of a reference circuit is gradually electrified, MP4 and MP5 are conducted, a bias current IB flowing through MP4 is mirrored to MP5 through a current mirror, so that the potential of a point A is increased, reference core working devices Q2, Q1, MP2, R1 and R2 are gradually started along with electrification, after the reference normally works, MP3 copies the current flowing through MP1 according to the mirror proportion, so that the potential of a point B is increased, the voltage of a drain terminal of MP4 is increased, the current enters a cut-off area, and after a starting circuit plays a role of starting the reference, the starting circuit is turned off.

As shown in fig. 5, the temperature sensing device of the module is a triode NPN with negative temperature coefficient, the base-collector voltage VBE of the NPN triode Q1 is a negative temperature coefficient voltage, when the temperature rises, the current flowing through the triode NPN increases, and whether the overheating phenomenon occurs in the system can be determined by detecting the base-collector voltage VBE. And designing a reasonable reference voltage REF _ OTP to meet VBE = REF _ OTP at 150 ℃. MP1 and MP2 are used as differential input pair tubes of the over-temperature protection module comparator, B _ OTP1 is sampling voltage input by the comparator, and REF _ OTP is reference voltage 320mV input by the comparator. MP3 and MP4 represent a pair of PMOS current mirrors, MN3 and MN4 represent a pair of NMOS current mirrors, and MN5 and MN6 represent a pair of NMOS current mirrors. The switching tubes MN1 and MN2 are used to realize the hysteresis function of the circuit.

As shown in fig. 6, the embodiment has a voltage stabilizing function, the input signal VIN of the high-power switching power supply is directly applied to the drain terminal of the N-type high-voltage power MOSFET, and an input overvoltage protection module is designed to prevent the input voltage from breaking through the power MOSFET due to too high input voltage. The enabling switch of the module is MN1, a gate end of the MN1 inputs a module enabling signal ENABLE, a differential input geminate transistor of the comparator is MP1 and MP2, an OVP pin of the chip reduces external input voltage through a resistor R1 and inputs the external input voltage to a grid electrode of a positive phase input end MP1 of the comparator, a grid electrode of a negative phase input end MP2 inputs 1.2V reference voltage, and an NMOS current mirror is used as an active load of the comparator.

As shown in fig. 7, the specific working mechanism of the module is: when the enable signal VEN =0V, the gate-source voltage VGS of the MN1 does not reach the threshold voltage VTH for conduction, at this time, the MN1 is turned off, and the potential at the point B is the power supply. Voltage VCC _ BG, signal C is high, signal XC is low, and MP1 is on. In the process that the enabling voltage VEN is reduced from 0V to negative voltage, MN1 starts to be gradually conducted; with the conduction of MN1, the leakage current of MN1 is gradually increased, the potential VB of a point B is pulled down, the values of R1-R4, the size of a rear-stage logic gate and a turnover threshold value are reasonably designed, the design of a negative-pressure enabling control function can be completed, the IEN of the current flowing through MN1 when EN takes a reasonable value from 0V to-1V meets the condition that IEN =6 muA, and the output signal of an enabling module is turned over correctly, so that the system can be started normally when the voltage of an enabling signal EN input by a switching power supply is a negative value.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a high-power switching power supply with steady voltage function which characterized in that includes: the device comprises a VIN end, a VCC end, a CP end, a CN end, a VP end, a CTRL end, an EN end, an OVP end, an LD0 voltage stabilizing module, a charge pump, an enabling module, a reference module, an operational amplifier COM, a logic control unit, a GND, a driver, a first triode, a resistor R1, a triode MN1, an over-temperature protection module, an under-voltage latch module and an output end VOUT which are connected in sequence; the VIN end is connected with the LD0 voltage stabilizing module and the collector electrode of the first triode respectively, the VCC end is connected with the LD0 voltage stabilizing module, the CP end, the CN end and the VP end are connected with one end of the charge pump respectively, the CTRL end is connected with the logic control unit, the EN end, the enable module and the logic control unit are connected in sequence, the OVP end is connected with the non-inverting input end of the operational amplifier COM, the reference module is connected with the inverting input end of the operational amplifier COM, the output end of the operational amplifier COM, the over-temperature protection module and the latch module are connected with the logic control unit respectively, the other end of the charge pump, the base electrode of the first triode and the logic control unit are connected with the driver respectively, the logic control unit is connected with the base electrode of the triode MN1, the emitter electrode of the first triode is connected with one end of the resistor R1 and the output end of the VOUT respectively, the other end of the resistor R1 is connected with the collector electrode of the triode MN1, the emitter electrode of the triode MN1 is grounded, and the OVP end, the GND and the output end of the VOUT are connected in sequence.

2. The high power switching power supply with voltage regulation function according to claim 1, wherein the charge pump comprises a switch S1, a switch S2, a capacitor C, a switch S3, a switch S4; supply voltage is connected respectively to switch S1 'S one end, switch S2' S one end, switch S1 'S the other end, switch S3' S one end respectively with electric capacity C 'S one end is connected, switch S2' S the other end, switch S4 'S one end respectively with electric capacity C' S the other end is connected, output voltage is connected to switch S3 'S the other end, switch S4' S the other end ground connection.

3. The high power switching power supply with voltage regulation function according to claim 1, wherein the LD0 voltage regulation module comprises: the circuit comprises a starting circuit, a reference circuit, an operational amplifier EA, a triode II, a compensation network and a divider resistor; the starting circuit, the reference circuit and the reverse input end of the operational amplifier EA are sequentially connected; the non-inverting input end of the operational amplifier EA is connected with the compensation network; the compensation network is connected with the divider resistor; the divider resistor is connected with an emitting electrode of the second triode and is connected with a power supply voltage; the output end of the operational amplifier EA is connected with the base electrode of the triode II; and the collector of the second triode is connected with the input voltage.

4. The high power switching power supply with voltage stabilizing function according to claim 3, wherein the starting circuit, the reference circuit, the compensation network and the voltage dividing resistor are respectively grounded.