CN117748962A - Output voltage control method and system - Google Patents
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Abstract
The embodiment of the invention provides an output voltage control method and system, which are applied to a negative power supply control circuit, wherein the negative power supply control circuit comprises an internal oscillator, an amplifier, a comparator and a pulse width modulation control circuit, the negative power supply control circuit is connected with a negative power supply conversion circuit, and the method comprises the following steps: generating a sawtooth wave by the internal oscillator; amplifying the feedback voltage input by the negative power supply conversion circuit based on a preset reference voltage through the amplifier; comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal; the pulse width modulation signal is input to the negative power supply conversion circuit through the pulse width modulation control circuit to control the output voltage of the negative power supply conversion circuit. The embodiment of the invention can complete the output control of the output voltage of the negative power supply conversion circuit by adopting few external devices, thereby reducing the cost of products.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to an output voltage control method and an output voltage control system.
Background
With the progress of science and technology, the degree of life science and technology is higher and higher, and many products are generally powered by a direct current power supply, such as a power adapter, a lithium battery, a nickel-metal hydride battery and the like, for miniaturization; however, some devices, such as op-amp devices, often use a negative power supply to achieve a higher dynamic range, a higher signal-to-noise ratio, and a better effect.
The existing scheme for converting the negative power supply often adopts a scheme of a charge pump or a transformer conversion mode, but the schemes have the characteristics of single circuit function, small carrying capacity, large occupied PCB (Printed Circuit Board ) area, non-adjustable output voltage and the like, and the circuit cost of the product is increased.
Disclosure of Invention
The embodiment of the invention provides an output voltage control method, which aims to solve the problem of high circuit cost of products in the prior art.
Correspondingly, the embodiment of the invention also provides an output voltage control system which is used for ensuring the realization and the application of the method.
In order to solve the above-mentioned problems, an embodiment of the present invention discloses an output voltage control method applied to a negative power supply control circuit, the negative power supply control circuit includes an internal oscillator, an amplifier, a comparator and a pulse width modulation control circuit, the negative power supply control circuit is connected with a negative power supply conversion circuit, the method includes:
generating a sawtooth wave by the internal oscillator;
amplifying the feedback voltage input by the negative power supply conversion circuit based on a preset reference voltage through the amplifier;
comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal;
the pulse width modulation signal is input to the negative power supply conversion circuit through the pulse width modulation control circuit to control the output voltage of the negative power supply conversion circuit.
Optionally, the negative power supply conversion circuit comprises an input voltage, an output voltage, a transistor, an inductor, a diode, a first resistor, a second resistor, a first capacitor and a second capacitor; the input voltage is connected with a first capacitor, the first capacitor is grounded, the input voltage is connected with a source electrode of the transistor, a grid electrode of the transistor is connected with an output end of the pulse width modulation control circuit of the negative power supply control circuit, a drain electrode of the transistor is connected with the inductor and a cathode of the diode, the inductor is grounded, an anode of the diode is connected with a second capacitor, the output voltage and the first resistor, the second capacitor is grounded, the first resistor is connected with a second resistor, the second resistor is connected with the input voltage, and the first resistor is connected with an amplifier of the negative power supply control circuit.
Optionally, when the transistor is controlled to be closed and turned on by the pulse width modulation signal, the first capacitor charges the inductor, the diode is turned off, and the output voltage discharges through the second capacitor to supply power to a load.
Optionally, when the transistor is controlled to be turned off by the pulse width modulation signal, the input voltage charges the first capacitor, the diode is turned on, and the inductor supplies power to the second capacitor and the load through the diode.
Optionally, when the magnitude of the input voltage is determined, the resistance values of the first resistor and the second resistor change the magnitude of the output voltage correspondingly.
Optionally, when the first resistor and the second resistor are determined, the magnitude of the input voltage changes and the magnitude of the output voltage changes accordingly.
Optionally, the first resistor and the second resistor are adjustable resistors.
Optionally, the input voltage is an adjustable input voltage.
Optionally, the transistor is a metal-oxide semiconductor field effect transistor.
The embodiment of the invention also discloses an output voltage control system, which comprises a negative power supply control circuit and a negative power supply conversion circuit which are connected, wherein the negative power supply control circuit comprises an internal oscillator, an amplifier, a comparator and a pulse width modulation control circuit, wherein:
the negative power supply control circuit is used for generating sawtooth waves through the internal oscillator; amplifying the feedback voltage input by the negative power supply conversion circuit based on a preset reference voltage through the amplifier; comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal; the pulse width modulation signal is input to the negative power supply conversion circuit through the pulse width modulation control circuit to control the output voltage of the negative power supply conversion circuit.
Optionally, the negative power supply conversion circuit comprises an input voltage, an output voltage, a transistor, an inductor, a diode, a first resistor, a second resistor, a first capacitor and a second capacitor; the input voltage is connected with a first capacitor, the first capacitor is grounded, the input voltage is connected with a source electrode of the transistor, a grid electrode of the transistor is connected with an output end of the pulse width modulation control circuit of the negative power supply control circuit, a drain electrode of the transistor is connected with the inductor and a cathode of the diode, the inductor is grounded, an anode of the diode is connected with a second capacitor, the output voltage and the first resistor, the second capacitor is grounded, the first resistor is connected with a second resistor, the second resistor is connected with the input voltage, and the first resistor is connected with an amplifier of the negative power supply control circuit.
Optionally, when the transistor is controlled to be closed and turned on by the pulse width modulation signal, the first capacitor charges the inductor, the diode is turned off, and the output voltage discharges through the second capacitor to supply power to a load.
Optionally, when the transistor is controlled to be turned off by the pulse width modulation signal, the input voltage charges the first capacitor, the diode is turned on, and the inductor supplies power to the second capacitor and the load through the diode.
Optionally, when the magnitude of the input voltage is determined, the resistance values of the first resistor and the second resistor change the magnitude of the output voltage correspondingly.
Optionally, when the first resistor and the second resistor are determined, the magnitude of the input voltage changes and the magnitude of the output voltage changes accordingly.
Optionally, the first resistor and the second resistor are adjustable resistors.
Optionally, the input voltage is an adjustable input voltage.
Optionally, the transistor is a metal-oxide semiconductor field effect transistor.
The embodiment of the invention has the following advantages:
in the embodiment of the invention, the negative power supply control circuit comprises an internal oscillator, an amplifier, a comparator and a pulse width modulation control circuit, wherein the negative power supply control circuit is connected with the negative power supply conversion circuit, the negative power supply control circuit generates sawtooth waves through internal oscillation, the feedback voltage input by the negative power supply conversion circuit is amplified based on a preset reference voltage through the amplifier, the amplified feedback voltage is compared with the sawtooth waves through the comparator to generate pulse width modulation signals, and then the pulse width modulation signals are input to the negative power supply conversion circuit through the pulse width modulation control circuit so as to control the output voltage of the negative power supply conversion circuit. According to the embodiment of the invention, the output voltage of the negative power supply conversion circuit is controlled by the negative power supply control circuit, so that the output control of the negative power supply (output voltage) of the negative power supply conversion circuit can be finished by few external devices, and the cost of products is reduced.
Drawings
FIG. 1 is a flow chart of steps of an output voltage control method according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of a sawtooth wave according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a PWM signal according to an embodiment of the present invention;
FIG. 4 is a flow chart of the control of the output voltage of the negative power supply conversion circuit according to the embodiment of the invention;
FIG. 5 is a system block diagram of a negative power control system provided by an embodiment of the present invention;
fig. 6 is a block diagram of a Charge pump negative power supply conversion circuit according to an embodiment of the present invention;
FIG. 7 is a block diagram of a transformer-based negative power conversion circuit according to an embodiment of the present invention;
fig. 8 is a block diagram of an output voltage control system according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, a step flow chart of an output voltage control method provided by an embodiment of the present invention is shown, where the method specifically may include the following steps:
step 101, generating a sawtooth wave through the internal oscillator.
In an embodiment of the present invention, the negative power supply control system may include a negative power supply control circuit and a negative power supply conversion circuit, and the negative power supply control circuit may include an internal oscillator, an amplifier, a comparator, and a pulse width modulation control circuit, where the negative power supply control circuit is connected to the negative power supply conversion circuit. Specifically, the internal oscillator is an OSC oscillator, and the internal oscillator mainly provides a clock signal for the operation of the negative power supply control system, so that the clock signal generated by the internal oscillator cooperates with a relevant sawtooth wave circuit to generate a sawtooth wave for one of important parts of the operation of the negative power supply control system. Exemplary, referring to fig. 2, a waveform diagram of a sawtooth wave is provided in an embodiment of the present invention.
And 102, amplifying the feedback voltage input by the negative power supply conversion circuit by the amplifier based on a preset reference voltage.
In the embodiment of the invention, the amplifier comprises an error level amplifier, and the error level amplifier amplifies the feedback voltage fed back by the negative power supply conversion circuit based on a preset reference voltage (Vref, vref can be 0.6V (volt)), so as to avoid error deviation of a negative power supply control system caused by too small error value.
Step 103, comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal.
In an embodiment of the present invention, the comparator may compare the amplified feedback voltage with a sawtooth wave to produce a pulse width modulated (PWM, pulse Width Modulation) signal. Exemplary, referring to fig. 3, a waveform diagram of a pulse width modulation signal according to an embodiment of the present invention is shown, where the pulse width modulation signal is a square wave.
Step 104, inputting the pulse width modulation signal to the negative power supply conversion circuit through the pulse width modulation control circuit so as to control the output voltage of the negative power supply conversion circuit.
In the embodiment of the invention, the pulse width modulation control circuit can also be called as a PWM control circuit, and the pulse width modulation control circuit controls whether the pulse width modulation signal is switched on or not, if the pulse width modulation signal is normal, the pulse width modulation control signal is switched on, and the pulse width modulation signal is output to the negative power supply conversion circuit so as to control the output voltage of the negative power supply conversion circuit; if the pulse width modulation signal is abnormal, the pulse width modulation control signal is turned off, and the pulse width modulation signal is turned off and output to the negative power supply conversion circuit.
Referring to fig. 4, an output voltage control flow chart of a negative power supply conversion circuit provided by an embodiment of the present invention is shown, where a negative power supply control system in the embodiment of the present invention mainly includes four parts, namely an internal oscillator, an error level amplifier, a comparator, and a PWM control circuit. The embodiment of the invention can complete the control of the output power supply of the negative power supply conversion circuit by only configuring few external devices, has the characteristics of high integration level, compact structure and the like, and specifically comprises the following steps:
the internal oscillator mainly provides a clock signal for the system to work, and the clock signal is matched with a relevant sawtooth wave circuit to generate a sawtooth wave for an important part of the system to work.
2, the amplifier amplifies the voltage fed back by the system under a preset reference voltage, otherwise, the error value is too small, which can lead to systematic error deviation.
And 3, the comparator compares the amplified signal with the sawtooth wave to generate a pulse width modulation square wave, namely a PWM signal.
4, the PWM control circuit controls whether the PWM signal is switched on or off, if the PWM signal is normal, the PWM control signal is turned on, and the PWM signal is output to the negative power supply conversion circuit; if the PWM signal is abnormal, the PWM control signal is turned off, and the PWM signal is turned off and output to the negative power supply conversion circuit.
In the embodiment of the invention, the negative power supply control circuit comprises an internal oscillator, an amplifier, a comparator and a pulse width modulation control circuit, wherein the negative power supply control circuit is connected with the negative power supply conversion circuit, the negative power supply control circuit generates sawtooth waves through internal oscillation, the feedback voltage input by the negative power supply conversion circuit is amplified based on a preset reference voltage through the amplifier, the amplified feedback voltage is compared with the sawtooth waves through the comparator to generate pulse width modulation signals, and then the pulse width modulation signals are input to the negative power supply conversion circuit through the pulse width modulation control circuit so as to control the output voltage of the negative power supply conversion circuit. According to the embodiment of the invention, the output voltage of the negative power supply conversion circuit is controlled by the negative power supply control circuit, so that the output control of the negative power supply (output voltage) of the negative power supply conversion circuit can be finished by few external devices, and the cost of products is reduced.
In an embodiment of the present invention, referring to fig. 5, a system block diagram of a negative power supply control system provided by an embodiment of the present invention, the negative power supply control system may include a negative power supply control circuit and a negative power supply conversion circuit, where the negative power supply control circuit includes an OSC internal oscillator, an amplifier, a comparator, and a PWM control circuit, and the PWM control circuit may send a PWM signal to the negative power supply conversion circuit to control an output voltage of the negative power supply conversion circuit, where the negative power supply conversion circuit may include an input voltage Vin, an output voltage Vout, a transistor Q1, an inductance L1, a diode D1, a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. Specifically, the input voltage Vin is connected to a first capacitor C1, the first capacitor is grounded GND, the input voltage Vin is connected to a source S of the transistor Q1, a gate G of the transistor Q1 is connected to an output end of the pwm control circuit of the negative power supply control circuit, a drain D of the transistor Q1 is connected to the inductor L1 and a cathode of the diode D1, the inductor L1 is grounded GND, an anode of the diode D1 is connected to the second capacitor C2, the output voltage Vout and the first resistor R1, the second capacitor C2 is grounded GND, the first resistor R1 is connected to the second resistor R2, the second resistor R2 is connected to the input voltage Vin, and the first resistor R1 is connected to the amplifier of the negative power supply control circuit.
As an alternative example of the present invention, the transistor Q1 may be a metal-oxide semiconductor field effect transistor MOSFET. In addition, the first resistor R1 and the second resistor R2 are adjustable resistors with adjustable resistance values, and the input voltage Vin is an adjustable input voltage.
In one embodiment of the present invention, when the transistor Q1 is controlled to be turned on by the pulse width modulation signal, the first capacitor C1 charges the inductor L1, the diode D is turned off, and the output voltage Vout discharges through the second capacitor C2 to supply power to the load.
In the embodiment of the invention, a negative power supply control system works normally, when a transistor Q1 is controlled to be closed and conducted through a PWM signal, current flows to an input voltage Vin- > the transistor Q1- > the inductor L1- > the ground GND- > the first capacitor C1- > the input voltage Vin, the input voltage Vin is directly connected to two ends of the inductor L1 at the moment, the input voltage Vin directly charges the inductor L1, the current of the inductor L1 is gradually increased, the inductor di/dt of the inductor L1 is large, the process is mainly powered by the input capacitor C1, and the input capacitor C1 is charged when the input voltage Vin is controlled to be turned off through the PWM signal. Since the transistor Q1 is turned on and turned off, which corresponds to the transistor Q1 being in a short circuit state, the voltages at the two ends of the diode D1 are the input voltage Vin and the output voltage Vout, respectively, and since the output voltage Vout is negative, the diode D1 is turned off reversely, and the output voltage Vout is discharged by the second capacitor C2 to supply power (supply energy) to the load.
In one embodiment of the present invention, when the transistor Q1 is controlled to be turned off by the pulse width modulation signal, the input voltage Vin charges the first capacitor C1, the diode D is turned on, and the inductor L1 supplies power to the load through the second capacitor C2 and the diode D1.
In the embodiment of the invention, the negative power supply control system works normally, and when the transistor Q1 is controlled to be turned off by the PWM signal, the input voltage Vin charges the input first capacitor C1. Since the inductor current cannot be suddenly changed, the inductor L1 supplies energy to the load through the second capacitor C2 and the freewheeling diode D1. The current flows to the second capacitor C2 by the diode D1 by the inductance L1 by the second capacitor C2.
It should be noted that, since the output voltage Vout is converted from the input power Vin, the voltage across the transistor and the diode D1 is vin+vout, and thus the voltage resistance should be noted during the device selection.
In one embodiment of the present invention, when the magnitude of the input voltage Vin is determined, the resistance values of the first resistor R1 and the second resistor R2 change to change the magnitude of the output voltage Vout correspondingly; when the first resistor R1 and the second resistor R2 are determined, the magnitude of the input voltage Vin changes and the magnitude of the output voltage Vout changes accordingly.
Referring to fig. 5, the voltage difference across the second resistor R2 is (Vfb-Vin), so the current flowing through the second resistor R2 is (Vfb-Vin)/R2. As can be seen from fig. 5, the current flowing through the first resistor R1 is also (Vfb-Vin)/R2, so the voltage across (r1+r2) is the current-resistance, i.e.And Vout-Vin is the voltage across (R1+R2), namely:
the Vfb is a feedback voltage, and the feedback voltage needs to be set in advance, that is, an amplifier+a reference voltage Vref. As can be seen from equation 1, under the condition that the input voltage Vin is determined, the purpose of changing the output voltage Vout can be achieved by changing the resistance values of the first resistor R1 and the second resistor R2. In addition, as can be seen from equation 1, the output voltage Vout is also related to the input voltage Vin, so if the resistance values of the first resistor R1 and the second resistor R2 are determined, the purpose of changing the output voltage Vout can be achieved by changing the input voltage Vin.
As can be seen from the above, the embodiment of the present invention can achieve the purpose of adjusting the output voltage Vout of the negative power supply by changing the resistance value of the first resistor R1 or the second resistor R2 or changing the voltage of the input voltage Vin without increasing the cost, and has the advantages of simple implementation, easy implementation, and wide application range.
In the related art scheme, there are many schemes for the output voltage Vout (negative power supply), for example, scheme 1: referring to fig. 6, a block diagram of a Charge pump negative power supply conversion circuit is shown, and a negative power supply can be generated in a form of Charge pump, where the scheme mainly has the problems of single output voltage and poor carrying capacity; scheme 2: the negative power supply can be generated in the form of a transformer, referring to fig. 7, which is a block diagram of a negative power supply conversion circuit based on a transformer, and an AC alternating current power supply, a T1 transformer, a rectifying device and an electrolytic capacitor are needed, after the negative power supply is output, if the ripple of the power supply is needed to be smaller, the negative power supply is usually realized by adding a negative power supply LDO (Low Drop-Out) voltage regulator, so that the scheme 2 has the advantages of more devices, low efficiency, larger volume of the transformer, more occupied PCB area, high cost and limited space requirement.
In practical applications, the operational amplifier of an audio system (home audio system, car audio system) uses a relatively large number of positive and negative power supplies. The negative power supply generated by using the scheme 1 generally uses an input voltage of only 5.5V at most, the carrying capacity is only tens of mA (milliamperes), the output power is too small, and the application range is relatively narrow; the negative power supply generated in the scheme 2 can be generated by a transformer, but the transformer has larger volume, larger occupied PCB area and limited space requirement.
The embodiment of the invention provides a negative power supply conversion method capable of adjusting output voltage, which can provide corresponding output voltage (negative power supply) according to the requirement, does not need to additionally increase the cooperation of voltage stabilizing circuit devices, does not need to adopt high-precision circuit devices, and does not increase the circuit cost. Specifically, the embodiment of the invention adopts the PWM signal to control the output voltage, so that the purpose of adjusting the output voltage of the negative power supply can be achieved by changing different feedback resistance values without increasing the cost.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Referring to fig. 8, there is shown a block diagram of an output voltage control system according to an embodiment of the present invention, where the output voltage control system includes a negative power supply control circuit 801 and a negative power supply conversion circuit 802, and the negative power supply control circuit 801 includes an internal oscillator, an amplifier, a comparator, and a pulse width modulation control circuit, where:
the negative power supply control circuit 802 for generating a sawtooth wave by the internal oscillator; amplifying the feedback voltage input by the negative power supply conversion circuit based on a preset reference voltage through the amplifier; comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal; the pulse width modulation signal is input to the negative power supply conversion circuit through the pulse width modulation control circuit to control the output voltage of the negative power supply conversion circuit 802.
In one embodiment of the present invention, the negative power supply conversion circuit 802 may include an input voltage, an output voltage, a transistor, an inductor, a diode, a first resistor, a second resistor, a first capacitor, and a second capacitor; the input voltage is connected with a first capacitor, the first capacitor is grounded, the input voltage is connected with a source electrode of the transistor, a grid electrode of the transistor is connected with an output end of the pulse width modulation control circuit of the negative power supply control circuit, a drain electrode of the transistor is connected with the inductor and a cathode of the diode, the inductor is grounded, an anode of the diode is connected with a second capacitor, the output voltage and the first resistor, the second capacitor is grounded, the first resistor is connected with a second resistor, the second resistor is connected with the input voltage, and the first resistor is connected with an amplifier of the negative power supply control circuit.
In one embodiment of the present invention, when the transistor is controlled to be turned on by the pulse width modulation signal, the first capacitor charges the inductor, the diode is turned off, and the output voltage discharges through the second capacitor to supply power to a load.
In one embodiment of the present invention, the input voltage charges the first capacitor and the diode is turned on when the transistor is controlled to be turned off by the pulse width modulation signal, and the inductor supplies power to the second capacitor and the load through the diode.
In one embodiment of the present invention, when the magnitude of the input voltage is determined, the resistance values of the first resistor and the second resistor change the magnitude of the output voltage correspondingly.
In one embodiment of the present invention, when the first resistor and the second resistor are determined, the magnitude of the input voltage changes and the magnitude of the output voltage changes accordingly.
In one embodiment of the invention, the first resistor and the second resistor are adjustable resistors.
In one embodiment of the invention, the input voltage is an adjustable input voltage.
In one embodiment of the invention, the transistor is a metal-oxide semiconductor field effect transistor.
In the embodiment of the invention, the negative power supply control circuit comprises an internal oscillator, an amplifier, a comparator and a pulse width modulation control circuit, wherein the negative power supply control circuit is connected with the negative power supply conversion circuit, the negative power supply control circuit generates sawtooth waves through internal oscillation, the feedback voltage input by the negative power supply conversion circuit is amplified based on a preset reference voltage through the amplifier, the amplified feedback voltage is compared with the sawtooth waves through the comparator to generate pulse width modulation signals, and then the pulse width modulation signals are input to the negative power supply conversion circuit through the pulse width modulation control circuit so as to control the output voltage of the negative power supply conversion circuit. According to the embodiment of the invention, the output voltage of the negative power supply conversion circuit is controlled by the negative power supply control circuit, so that the output control of the negative power supply (output voltage) of the negative power supply conversion circuit can be finished by few external devices, and the cost of products is reduced.
For system embodiments, the description is relatively simple as it is substantially similar to method embodiments, and reference is made to the description of method embodiments for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Moreover, embodiments of the invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, EEPROM, flash, eMMC, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The foregoing has outlined a detailed description of the output voltage control method and system of the present invention, and specific examples have been presented herein to illustrate the principles and embodiments of the present invention, the above examples being provided only to assist in understanding the method and core concepts of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. An output voltage control method, characterized by being applied to a negative power supply control circuit including an internal oscillator, an amplifier, a comparator, and a pulse width modulation control circuit, the negative power supply control circuit being connected to a negative power supply conversion circuit, the method comprising:
generating a sawtooth wave by the internal oscillator;
amplifying the feedback voltage input by the negative power supply conversion circuit based on a preset reference voltage through the amplifier;
comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal;
the pulse width modulation signal is input to the negative power supply conversion circuit through the pulse width modulation control circuit to control the output voltage of the negative power supply conversion circuit.
2. The method of claim 1, wherein the negative power supply conversion circuit comprises an input voltage, an output voltage, a transistor, an inductor, a diode, a first resistor, a second resistor, a first capacitor, a second capacitor; the input voltage is connected with a first capacitor, the first capacitor is grounded, the input voltage is connected with a source electrode of the transistor, a grid electrode of the transistor is connected with an output end of the pulse width modulation control circuit of the negative power supply control circuit, a drain electrode of the transistor is connected with the inductor and a cathode of the diode, the inductor is grounded, an anode of the diode is connected with a second capacitor, the output voltage and the first resistor, the second capacitor is grounded, the first resistor is connected with a second resistor, the second resistor is connected with the input voltage, and the first resistor is connected with an amplifier of the negative power supply control circuit.
3. The method of claim 2, wherein the first capacitor charges the inductor and the diode is turned off when the transistor is controlled to be turned on by the pulse width modulation signal, and wherein the output voltage is discharged through the second capacitor to power a load.
4. The method of claim 2, wherein the input voltage charges the first capacitor and the diode is turned on when the transistor is controlled to turn off by the pulse width modulated signal, and the inductor powers the second capacitor and the load through the diode.
5. The method of claim 2, wherein when the magnitude of the input voltage is determined, the resistance values of the first and second resistors change to correspondingly change the magnitude of the output voltage.
6. The method of claim 2, wherein when the first and second resistances are determined, the magnitude of the input voltage changes and the magnitude of the output voltage changes accordingly.
7. The method of claim 5, wherein the first and second resistances are adjustable resistances.
8. The method of claim 6, wherein the input voltage is an adjustable input voltage.
9. The method of claim 2, wherein the transistor is a metal-oxide semiconductor field effect transistor.
10. An output voltage control system comprising a negative power supply control circuit connected to a negative power supply conversion circuit, the negative power supply control circuit comprising an internal oscillator, an amplifier, a comparator, and a pulse width modulation control circuit, wherein:
the negative power supply control circuit is used for generating sawtooth waves through the internal oscillator; amplifying the feedback voltage input by the negative power supply conversion circuit based on a preset reference voltage through the amplifier; comparing the amplified feedback voltage with the sawtooth wave through the comparator to generate a pulse width modulation signal; the pulse width modulation signal is input to the negative power supply conversion circuit through the pulse width modulation control circuit to control the output voltage of the negative power supply conversion circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311602959.8A CN117748962A (en) | 2023-11-27 | 2023-11-27 | Output voltage control method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311602959.8A CN117748962A (en) | 2023-11-27 | 2023-11-27 | Output voltage control method and system |
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| CN117748962A true CN117748962A (en) | 2024-03-22 |
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