Input voltage and current adaptive adjusting circuit used in chip

Abstract

The invention belongs to the field of chips, and provides an input voltage and current adaptive adjusting circuit used in a chip, the adjusting circuit comprises an input voltage source, an input voltage detection circuit, a ramp signal generator and an internal current control circuit, the input voltage detection circuit is used for carrying out voltage level identification on the input voltage source; outputting a corresponding digital signal to indicate the current input voltage level; the ramp signal generator is used for dynamically adjusting an output result according to the digital signal, so that switching frequencies and duty ratios of different input voltages are corrected; the internal current control circuit is connected to an input voltage source and comprises a first MOS tube, a second MOS tube and a detection resistor, the detection resistor is used for feeding back the output current of the internal current control circuit, and the first MOS tube and the second MOS tube are used for adjusting the current under the control of input parameters of an external control chip according to a digital signal and a signal fed back by the detection resistor; according to the invention, accurate detection of input voltage and dynamic adjustment of system parameters can be realized.

Description

Technical Field

[0001] The present invention relates to the field of chips, and in particular to an input voltage and current adaptive adjustment circuit used in a chip. Background Art

[0002] The current pulse width modulation boost converter architecture is as follows Figure 1 As shown, it is composed of two feedback loops, one is a voltage loop and the other is a current loop. The control principle of the voltage loop is to detect the output voltage, feed it back to the comparator and compare it with the reference voltage to obtain an error voltage result. According to the result, the VCOMP voltage is adjusted. It is mainly composed of circuits such as error amplifier, comparator and pulse generator. The current loop detects the current of the power transistor, and the fixed current ratio is obtained by the current-to-voltage amplifier to obtain a pulse slope Rf. Its circuit structure consists of a sensing resistor Rsense, a voltage-to-current amplifier, and a pulse generator. The results obtained from the two loops are superimposed and compared to form a PWM control signal to output pulses with different duty cycles. The existing current loop technology uses a smaller width transistor in parallel with M1 to generate a sensing current. M1 has a proportional relationship with the width of the sensing transistor. The sensing current is connected in series with the resistor Rsense to generate a sensing voltage Vsense. The voltage is detected by the voltage-to-current amplifier to generate the Rf value. Through the pulse generator, the required ramp is generated to control M1.

[0003] The relationship is as follows:

[0004]

[0005] Among them, I L : load current, I1: current on M1.

[0006] Therefore, the gate control voltage (Vgs) of the sensing transistor M2 is generated by using the VIN voltage as a reference voltage source. Under different VIN, there are different gate control voltages (Vgs). Due to the above reasons, different Rsense slopes will be generated, which will eventually affect the Rf value and make it impossible to accurately control the pulse width. Summary of the invention

[0007] In view of the above technical problems, the present invention provides an input voltage and current adaptive adjustment circuit for use inside a chip to achieve accurate detection of the input voltage and dynamic adjustment of system parameters.

[0008] Other features and advantages of the present invention will become apparent from the following detailed description, or may be learned in part by practice of the present invention.

[0009] The present invention discloses an input voltage and current adaptive adjustment circuit for a chip, the adjustment circuit comprises an input voltage source, an input voltage detection circuit, a ramp signal generator, and an internal current control circuit, wherein:

[0010] The input voltage detection circuit is used to identify the voltage level of the input voltage source and output the corresponding digital signal to indicate the current input voltage level;

[0011] The ramp signal generator is used to dynamically adjust the output result according to the digital signal so that the switching frequency and duty cycle of different input voltages of the input voltage source are corrected;

[0012] The internal current control circuit is connected to the input voltage source, and includes a first MOS transistor, a second MOS transistor and a detection resistor. The detection resistor is used to feed back the output current of the internal current control circuit. The first MOS transistor and the second MOS transistor are used to adjust the current under the control of the input parameters of the external control chip according to the digital signal and the signal fed back by the detection resistor.

[0013] Furthermore, the input voltage detection circuit is composed of a resistor divider network and a comparator, and the comparator is used to compare the voltage of the input voltage source after being divided by the resistor divider network, and output the corresponding digital signal to indicate the current input voltage level.

[0014] The technical solution of the present invention has the following beneficial effects:

[0015] According to the different input voltages VIN, the circuit can output different digital signals and adjust the internal current control parameters and ramp control signals accordingly to ensure that the best working state can be achieved under each input voltage, and can automatically adapt to different input voltages, optimize power efficiency and performance, improve system stability and reliability, and maintain the simplicity of circuit design. The present invention is suitable for a variety of power supply systems that need to process different input voltages, such as portable electronic devices, automotive electronics, and industrial control systems. By intelligently detecting the input voltage and adaptively adjusting the internal parameters, the present invention significantly improves the flexibility and efficiency of the power supply system, while maintaining the consistency of the external circuit, and has broad application prospects and important practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A circuit diagram of a current-mode pulse width modulation booster architecture disclosed in the background technology of this specification;

[0017] Figure 2 This is a schematic diagram of an input voltage and current adaptive adjustment circuit used inside a chip in an embodiment of this specification. DETAILED DESCRIPTION

[0018] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as being limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present invention will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced while omitting one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known technical solutions are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0019] like Figure 2 As shown, the embodiment of this specification provides an input voltage and current adaptive adjustment circuit for the chip, the adjustment circuit includes an input voltage source VIN, an input voltage detection circuit 1, a ramp signal generator 2, and an internal current control circuit 3, wherein:

[0020] The input voltage detection circuit 1 is used to identify the voltage level of the input voltage source and output the corresponding digital signal to indicate the current input voltage level;

[0021] The ramp signal generator 2 is used to dynamically adjust the output result according to the digital signal so that the switching frequency and duty cycle of different input voltages of the input voltage source are corrected;

[0022] The internal current control circuit 3 is connected to the input voltage source, and includes a first MOS tube M1, a second MOS tube M2 and a detection resistor Rsense. The detection resistor Rsense is used to feed back the output current of the internal current control circuit. The first MOS tube M1 and the second MOS tube M2 are used to adjust the current under the control of the input parameters of the external control chip according to the digital signal and the signal fed back by the detection resistor Rsense.

[0023] The input voltage detection circuit is composed of a resistor voltage divider network and a comparator. The comparator is used to compare the voltage of the input voltage source after being divided by the resistor voltage divider network, and output the corresponding digital signal to indicate the current input voltage level.

[0024] Specifically, the input voltage source VIN, the input voltage detection circuit 1, the ramp signal generator 2 and the internal current control circuit 3 work together to achieve accurate detection of the input voltage and dynamic adjustment of system parameters. The input voltage detection circuit 1 is composed of a resistor voltage divider network and a comparator, which can accurately identify different input voltage levels, such as 5V, 3.3V, 2.5V, etc. The voltage comparator compares the detected voltage with a preset threshold value and outputs a corresponding digital signal to indicate the current input voltage level. These digital signals are then used to control the parameter adjustment of other parts of the system. The ramp signal generator 2 dynamically adjusts its output parameters according to the input voltage detection result, specifically optimizing the switching frequency and duty cycle under different input voltages. At the same time, the current control circuit is composed of M1, M2 and a detection resistor Rsense, which monitors the current in the circuit in real time and provides important feedback information for the system. In this embodiment, the internal current control circuit is particularly important. Although the resistor Rk is a fixed resistor and cannot be adjusted, the equivalent current setting adjustment can be achieved by adjusting the internal current source or voltage reference. This design ensures that the system can maintain optimal performance under different input voltages without changing external components. Its working method is as follows:

[0025] First, the input voltage is detected, and then the detected voltage is compared with a preset threshold value. According to the comparison result, the corresponding digital signal is output, and these signals are used to control the parameter adjustment of the ramp signal generator 3, and also adjust the parameters of the internal current control circuit. In this way, adaptive control of the power supply system is achieved.

[0026] In a specific implementation, when VIN is 5V, 3.3V or 2.5V, the system will output different digital signals and adjust the internal current control parameters accordingly to ensure that the best working state can be achieved at each input voltage. The advantage of this design is that it can automatically adapt to different input voltages, optimize power efficiency and performance, improve system stability and reliability, and maintain the simplicity of circuit design. The present invention is suitable for a variety of power supply systems that need to process different input voltages, such as portable electronic devices, automotive electronics, and industrial control systems. By intelligently detecting the input voltage and adaptively adjusting the internal parameters, the present invention significantly improves the flexibility and efficiency of the power supply system, while maintaining the consistency of the external circuit, and has broad application prospects and important practical value.

[0027] Those skilled in the art will readily appreciate other embodiments of the invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art that are not disclosed in the present invention. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

Claims

1. A circuit for adaptively adjusting input voltage and current inside a chip, characterized in that: The adjustment circuit includes an input voltage source, an input voltage detection circuit, a ramp signal generator, and an internal current control circuit, wherein: The input voltage detection circuit is used to identify the voltage level of the input voltage source and output the corresponding digital signal to indicate the current input voltage level; The ramp signal generator is used to dynamically adjust the output result according to the digital signal so that the switching frequency and duty cycle of different input voltages of the input voltage source are corrected; The internal current control circuit is connected to the input voltage source, and includes a first MOS transistor, a second MOS transistor and a detection resistor. The detection resistor is used to feed back the output current of the internal current control circuit. The first MOS transistor and the second MOS transistor are used to adjust the current under the control of the input parameters of the external control chip according to the digital signal and the signal fed back by the detection resistor.

2. The input voltage and current adaptive adjustment circuit for a chip according to claim 1, characterized in that: The input voltage detection circuit is composed of a resistor voltage divider network and a comparator. The comparator is used to compare the voltage of the input voltage source after being divided by the resistor voltage divider network, and output the corresponding digital signal to indicate the current input voltage level.

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