CN115864812A - Soft start control device and power supply system - Google Patents
Soft start control device and power supply system Download PDFInfo
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- CN115864812A CN115864812A CN202211542077.2A CN202211542077A CN115864812A CN 115864812 A CN115864812 A CN 115864812A CN 202211542077 A CN202211542077 A CN 202211542077A CN 115864812 A CN115864812 A CN 115864812A
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Abstract
The application belongs to the technical field of circuits and provides a soft start control device and a power supply system. The power supply circuit comprises a soft start slope control module, a threshold voltage generation module, a slope voltage generation module and a direct current voltage stabilization module, a plurality of soft start control signals and slope switching signals are output by the soft start slope control module, the soft start control signals and the slope switching signals are used for controlling the voltage increasing speed of the slope voltage signals, the overall structure of the soft start control device is simplified, the overall cost is reduced, the control of the voltage rising time of the slope voltage signals can be realized by setting a first rate and a second rate, the soft start control device can control the soft start time according to different requirements, and the application scene of the soft start control device is expanded.
Description
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a soft start control device and a power supply system.
Background
With the rapid development of the fields of communication, computer, consumer electronics, and the like, the demand for power management is also increasing. During the starting process, the digital circuit needs higher and higher driving current capacity, from a few milliamperes of current of a small-scale digital circuit to a power consumption of more than 100mA or even hundreds of mA of current of a large-scale digital circuit. If the direct current voltage stabilizer with large output current is electrified too fast, surge current can occur in the power-on process, so that a power transistor, a subsequent circuit and even a power supply battery are damaged. To prevent this, the most common method is to use a soft start circuit that can control the ramp-up speed of the output voltage of the dc voltage regulator from zero to a target value.
However, the existing soft start circuit generally uses an off-chip passive component to build up to realize the soft start of the output voltage, but the off-chip component mode increases the volume and cost of the board-level circuit, so that the overall cost and the circuit size are increased, and the use of the direct current voltage stabilizer is greatly limited.
Disclosure of Invention
In order to solve the above technical problem, an embodiment of the present application provides a soft start control device and a power supply system, which can solve the problems of high overall cost and large circuit size of the existing soft start circuit.
A first aspect of an embodiment of the present application provides a soft-start control device, including:
the soft start slope control module is used for receiving a soft start configuration signal and generating a plurality of soft start control signals and slope switching signals according to the soft start configuration signal;
the threshold voltage generation module is used for receiving the current reference signal and generating a threshold voltage signal according to the current reference signal;
a ramp voltage generating module, connected to the soft start slope control module and the threshold voltage generating module, respectively, for generating a ramp voltage signal according to the plurality of soft start control signals, the slope switching signal, the threshold voltage signal, the initial voltage signal, and the reference voltage signal; after the voltage of the initial voltage signal is increased to the voltage of the threshold voltage signal according to a first rate, the voltage of the ramp voltage signal is increased to the voltage of the reference voltage signal according to a second rate;
and the direct current voltage stabilizing module is connected with the ramp voltage generating module and used for receiving the ramp voltage signal and adjusting the gain of the ramp voltage signal according to the received gain control signal.
In one embodiment, the first rate is less than the second rate.
In one embodiment, the ramp voltage generation module includes:
the switch switching unit is connected with the soft start slope control module and used for receiving the slope switching signal, the initial voltage signal and the reference voltage signal and switching the access states of the initial voltage signal and the reference voltage signal according to the slope switching signal;
and the voltage dividing unit is connected with the switch switching unit, the soft start slope control module and the threshold voltage generation module, and is used for receiving the initial voltage signal, the reference voltage signal, the threshold voltage signal and a plurality of soft start control signals, dividing the threshold voltage signal, the initial voltage signal and the reference voltage signal according to the plurality of soft start control signals, and outputting the ramp voltage signal.
In one embodiment, the voltage dividing unit includes a plurality of pull-up resistance sub-units and a plurality of pull-down resistance sub-units connected in series with the pull-up resistance sub-units;
the plurality of pull-up resistor subunits are connected in parallel, the plurality of pull-down resistor subunits are connected in parallel, and the plurality of soft start control signals are used for adjusting the resistance value ratio between the plurality of pull-up resistor subunits and the plurality of pull-down resistor subunits.
In one embodiment, the pull-up resistance subunit includes: a first switching element and a pull-up resistor, wherein the first switching element and the pull-up resistor are connected in series;
the pull-down resistor subunit comprises a second switch element and a pull-down resistor, and the second switch element is connected with the pull-down resistor in series.
In one embodiment, the number of pull-up resistor sub-cells is the same as the number of pull-down resistor sub-cells.
In one embodiment, the difference in resistance between pull-up resistors in adjacent ones of the pull-up resistor sub-cells is equal.
In one embodiment, the resistance values of the pull-up resistors in the plurality of pull-up resistor subunits are arranged in an equal ratio.
In one embodiment, the resistance values of the pull-up resistor sub-units are equal to the resistance values of the pull-down resistor sub-units.
A second aspect of embodiments of the present application provides a power supply system comprising a soft-start control apparatus as defined in any one of the preceding claims.
The embodiment of the application provides a soft start control device, and in this application, through setting up a plurality of soft start control signals of soft start slope control module output and slope switching signal, a plurality of soft start control signals and slope switching signal are used for controlling the speed that the voltage of slope voltage signal increases, have simplified soft start control device's overall structure, have reduced overall cost. The voltage of the ramp voltage signal is increased according to the first rate and the second rate respectively in the increasing process, the time that the voltage of the ramp voltage signal reaches the voltage of the reference voltage signal is greatly reduced while the electric load is prevented from being impacted by large current, and therefore the time of the power supply system for performing soft start is shortened.
Drawings
Fig. 1 is a schematic structural diagram of a soft start control device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram ii of a soft start control device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram three of a soft start control device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a soft start control device according to an embodiment of the present application;
FIG. 5 is a specific circuit diagram of a threshold voltage generation module according to an embodiment of the present application;
fig. 6 is a specific circuit diagram of a ramp voltage generation module according to an embodiment of the present application;
fig. 7 is a first schematic waveform diagram illustrating a plurality of soft start control signals and a slope switching signal generated by a soft start slope control module according to an embodiment of the present disclosure;
fig. 8 is a schematic waveform diagram ii of a plurality of soft start control signals and a slope switching signal generated by a soft start slope control module according to an embodiment of the present application;
fig. 9 is a schematic diagram illustrating a waveform amplification of a plurality of soft start control signals and a slope switching signal generated by a soft start slope control module according to an embodiment of the present application;
fig. 10 is a schematic diagram illustrating waveform amplification of a plurality of soft start control signals and a slope switching signal generated by a soft start slope control module according to an embodiment of the present application;
fig. 11 is a third schematic diagram illustrating waveform amplification of a plurality of soft start control signals and a slope switching signal generated by a soft start slope control module according to an embodiment of the present disclosure;
fig. 12 is a first schematic diagram illustrating waveforms generated by the ramp voltage generating module and the dc voltage stabilizing module according to an embodiment of the present disclosure;
fig. 13 is a schematic diagram of waveforms generated by the ramp voltage generating module and the dc voltage stabilizing module according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means one or more unless specifically limited otherwise.
With the rapid development of the fields of communication, computer, consumer electronics, and the like, the demand for power management is also increasing. During the starting process, the digital circuit needs higher and higher driving current capacity, from a few milliamperes of the small-scale digital circuit to a power consumption of the large-scale digital circuit exceeding 100mA or even hundreds of mA. If the direct current voltage stabilizer with large output current is electrified too fast, surge current can occur in the electrifying process, so that a power transistor, a subsequent circuit and even a power supply battery are damaged. To prevent this, the most common method is to use a soft start circuit that can control the ramp-up speed of the output voltage of the dc voltage regulator from zero to a target value.
However, the existing soft start circuit generally uses an off-chip passive component to build up to realize the soft start of the output voltage, but the off-chip component mode increases the volume and cost of the board-level circuit, so that the overall cost and the circuit size are increased, and the use of the direct current voltage stabilizer is greatly limited.
In order to solve the above technical problem, referring to fig. 1, an embodiment of the present application provides a soft-start control device, including: the soft start slope control module 10, the threshold voltage generation module 20, the ramp voltage generation module 30 and the dc stabilization module 40.
Specifically, the soft start slope control module 10 is configured to receive a soft start configuration signal, and generate a plurality of soft start control signals and slope switching signals according to the soft start configuration signal. The threshold voltage generation module 20 is configured to receive the current reference signal and generate a threshold voltage signal according to the current reference signal. The ramp voltage generating module 30 is respectively connected to the soft-start slope control module 10 and the threshold voltage generating module 20, and the ramp voltage generating module 30 is configured to generate a ramp voltage signal according to a plurality of soft-start control signals, a slope switching signal, a threshold voltage signal, an initial voltage signal, and a reference voltage signal; after the voltage of the ramp voltage signal is increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal according to a first rate, the voltage of the ramp voltage signal is increased from the voltage of the threshold voltage signal to the voltage of the reference voltage signal according to a second rate. The dc voltage stabilizing module 40 is connected to the ramp voltage generating module 30, and the dc voltage stabilizing module 40 is configured to receive the ramp voltage signal and adjust the gain of the ramp voltage signal according to the received gain control signal.
In this embodiment, the soft-start slope control module 10 may be an encoder, and the soft-start slope control module 10 is configured to generate a plurality of soft-start control signals and a slope switching signal according to a soft-start configuration signal. The soft start configuration signal may include clock frequency configuration information, time configuration information, rate configuration information, and the like. Specifically, the time configuration information is used to control the output sequence and output duration of the plurality of soft start control signals, and the rate configuration information is used to control the output of the slope switching signal. By arranging the soft start slope control module 10 as the encoder, a plurality of soft start control signals and slope switching signals can be output in a simple and convenient manner, the overall structure of the soft start control device is simplified, and the overall cost is reduced.
In the present embodiment, the threshold voltage generation module 20 is configured to generate a threshold voltage signal according to the current reference signal. Specifically, the threshold voltage signal may be formed by a current reference signal flowing through a current source. The threshold voltage signals can be different in different application scenarios, because the threshold voltages of the CMOS transistors in different dc voltage stabilization modules 40 are different, the application can generate different threshold voltage signals for the CMOS transistors in different dc voltage stabilization modules 40, and the application scenarios and the application range of the soft start control device are expanded.
In this embodiment, the ramp voltage generating module 30 is configured to receive a plurality of soft-start control signals, a slope switching signal, a threshold voltage signal, an initial voltage signal, and a reference voltage signal to generate a ramp voltage signal, and generate the ramp voltage signal according to the plurality of soft-start control signals, the slope switching signal, the threshold voltage signal, the initial voltage signal, and the reference voltage signal. Since the voltage of the initial voltage signal is the initial voltage of the ramp voltage signal, the voltage of the initial voltage signal is generally 0V, and the voltage of the reference voltage signal is the voltage at which the ramp voltage signal is finally stably output to the dc regulator module 40. It is understood that the ramp voltage generating module 30 is mainly used for dividing the threshold voltage signal, the initial voltage signal and the reference voltage signal to generate the ramp voltage signal according to the plurality of soft-start control signals and the slope switching signal, so that the voltage of the output ramp voltage signal is increased from 0V to the voltage of the reference voltage signal at a controllable speed. The problem that the direct current voltage stabilizing module 40 or the electric load is damaged due to the fact that the direct current voltage stabilizing module 40 is impacted by surge current or surge voltage is solved.
In this embodiment, the voltage of the ramp voltage signal is increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal at a first rate, and then increased from the voltage of the threshold voltage signal to the voltage of the reference voltage signal at a second rate. Specifically, the voltage of the threshold voltage signal is the threshold voltage of the CMOS transistor in the dc regulator module 40, because the CMOS transistor in the dc regulator module 40 is easily affected by the surge voltage or the surge current from the on state to the off state near the threshold voltage, and the breakdown or the damage may occur. In this embodiment, by setting the voltage of the ramp voltage signal to be increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal at the first rate, the speed at which the voltage of the ramp voltage signal reaches the threshold voltage of the CMOS transistor can be controlled, and the problem that the CMOS transistor in the dc voltage stabilizing module 40 is impacted by a large current during the turn-on or turn-off period is avoided. By increasing the voltage of the ramp voltage signal from the voltage of the threshold voltage signal to the voltage of the reference voltage signal at the second rate, the time for the voltage of the ramp voltage signal to reach the voltage of the reference voltage signal can be reduced, thereby shortening the time for the soft start control device to perform soft start. In this embodiment, by setting the first rate and the second rate, the control of the voltage rising time of the ramp voltage signal can be realized, so that the soft start control device can control the soft start time according to different requirements, and the application scenarios of the soft start control device are expanded.
In this embodiment, the dc voltage stabilizing module 40 is configured to receive the ramp voltage signal and adjust the gain of the ramp voltage signal according to the received gain control signal. Specifically, the gain control signal may be an externally input control signal for performing gain processing on the voltage of the ramp voltage signal. For example, the dc voltage stabilizing module 40 may increase the voltage of the ramp voltage signal to 2 times output according to the gain control signal, or may also decrease the voltage of the ramp voltage signal to 0.5 times output according to the gain control signal to supply power to the power load.
In one embodiment, the first rate is less than the second rate.
In the present embodiment, it can be understood that the rate at which the voltage of the ramp voltage signal increases from the voltage of the initial voltage signal to the voltage of the threshold voltage signal is less than the rate at which the voltage of the ramp voltage signal increases from the voltage of the threshold voltage signal to the voltage of the reference voltage signal. Because the logic gate circuit is switched off to be switched on near the threshold voltage of the CMOS transistor, and the gate capacitance of the CMOS transistor is rapidly increased, the superposition of the two points generates a transient large current on the supply voltage output by the dc voltage stabilizing module 40, and the rate of increasing the voltage of the ramp voltage signal from the voltage of the initial voltage signal to the voltage of the threshold voltage signal is set to be small, which is helpful for smoothing the load change, and can realize the soft start of the electric load. After the voltage of the ramp voltage signal is increased to the voltage of the threshold voltage signal, the CMOS transistor is completely started at the moment, and no current mutation exists, the speed of increasing the voltage of the ramp voltage signal from the voltage of the threshold voltage signal to the voltage of the reference voltage signal is high, the power-on speed can be increased, and the power-on time can be shortened.
In one embodiment, referring to fig. 2, the soft-start control apparatus further includes: an initial voltage generating module 50 and a reference voltage generating module 60.
Specifically, the initial voltage generating module 50 is used for providing an initial voltage signal. The reference voltage generating module 60 is used for providing a reference voltage signal. In this embodiment, the initial voltage signal is used to provide the initial voltage of the ramp voltage signal, and the reference voltage signal is used to provide the plateau voltage of the final output of the ramp voltage signal.
In one embodiment, referring to fig. 3, the ramp voltage generation module 30 includes: a switch switching unit 31 and a voltage dividing unit 32.
Specifically, the switch switching unit 31 is connected to the soft start slope control module 10, and the switch switching unit 31 is configured to receive a slope switching signal, an initial voltage signal, and a reference voltage signal, and switch access states of the initial voltage signal and the reference voltage signal according to the slope switching signal. The voltage dividing unit 32 is connected to the switch switching unit 31 and the soft start slope control module 10, and the voltage dividing unit 32 is configured to receive the initial voltage signal, the reference voltage signal, the threshold voltage signal, and the plurality of soft start control signals, divide the voltage of the threshold voltage signal, the initial voltage signal, and the reference voltage signal according to the plurality of soft start control signals, and output a ramp voltage signal.
In this embodiment, the switch switching unit 31 is respectively connected to the soft-start slope control module 10, the initial voltage generation module 50, the reference voltage generation module 60, and the voltage dividing unit 32, it can be understood that a first input end of the switch switching unit 31 is connected to the initial voltage generation module 50, a second input end of the switch switching unit 31 is connected to the reference voltage generation module 60, an output end of the switch switching unit 31 is connected to the voltage dividing unit 32, a control end of the switch switching unit 31 is connected to the soft-start slope control module 10, and the control end of the switch switching unit 31 receives the slope switching signal and then connects the initial voltage signal or the reference voltage signal to the voltage dividing unit 32, so that the voltage dividing unit 32 performs voltage dividing processing on the initial voltage signal or the reference voltage signal.
In this embodiment, a first input end of the voltage dividing unit 32 is connected to the threshold voltage generating module 20, a first input end of the voltage dividing unit 32 is configured to receive a threshold voltage signal, a second input end of the voltage dividing unit 32 is connected to the switch switching unit 31, a second input end of the voltage dividing unit 32 is configured to receive an initial voltage signal or a reference voltage signal, a control end of the voltage dividing unit 32 is connected to the soft-start slope control module 10, and a control end of the voltage dividing unit 32 is configured to receive a plurality of soft-start control signals and is turned on or off according to the plurality of soft-start control signals, so as to divide voltages connected to the first input end and the second input end of the voltage dividing unit 32, thereby implementing control of the voltage of the output ramp voltage signal.
In one embodiment, the switch switching unit 31 may switch the initial voltage signal into the voltage dividing unit 32 according to the slope switching signal, and at this time, the voltage dividing unit 32 is turned on or off according to a plurality of soft start control signals to divide the switched initial voltage signal and the threshold voltage signal, so that the voltage of the ramp voltage signal is increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal at a first rate. The switch switching unit 31 may switch the reference voltage signal into the voltage dividing unit 32 according to the slope switching signal, and at this time, the voltage dividing unit 32 may be turned on or off according to the plurality of soft-start control signals to divide the switched reference voltage signal and the threshold voltage signal, so that the voltage of the ramp voltage signal is increased from the voltage of the threshold voltage signal to the voltage of the reference voltage signal at the second rate. Therefore, the voltage of the ramp voltage signal is increased to the voltage of the reference voltage signal at a controllable speed, the soft start of the voltage is realized, the implementation mode is simple, the cost is reduced, and the use of the direct current voltage stabilizer is expanded.
In one embodiment, referring to fig. 4, the voltage dividing unit 32 includes a plurality of pull-up resistance sub-units 321 and a plurality of pull-down resistance sub-units 322 connected in series with the pull-up resistance sub-units 321. The pull-up resistor subunits 321 are connected in parallel, the pull-down resistor subunits 322 are connected in parallel, and the soft start control signals are used for adjusting the resistance ratio between the pull-up resistor subunits 321 and the pull-down resistor subunits 322.
In the present embodiment, the first terminals of the plurality of pull-up resistor sub-units 321 are connected to the threshold voltage generation module 20, and the first terminals of the plurality of pull-up resistor sub-units 321 are configured to receive a threshold voltage signal; the second ends of the pull-up resistor subunits 321 are connected to the first ends of the pull-down resistor subunits 322 in a one-to-one correspondence manner, the second ends of the pull-down resistor subunits 322 are commonly connected to the switch switching unit 31, the second ends of the pull-down resistor subunits 322 are used for receiving an initial voltage signal or a reference voltage signal, the second ends of the pull-up resistor subunits 321 and the first ends of the pull-down resistor subunits 322 are used for outputting a ramp voltage signal, and the control ends of the pull-up resistor subunits 321 and the control ends of the pull-down resistor subunits 322 are both connected to the soft start slope control module 10 and used for receiving a plurality of soft start control signals.
In the present embodiment, a plurality of pull-up resistor sub-units 321 are arranged in parallel, and a plurality of pull-down resistor sub-units 322 are arranged in parallel. It is understood that each pull-up resistor subunit 321 is connected in series with a pull-down resistor subunit 322. The plurality of soft-start control signals are used to adjust the resistance ratio between the plurality of pull-up resistor subunits 321 and the plurality of pull-down resistor subunits 322. For example, the plurality of soft-start control signals may be used to control on or off states of the plurality of pull-up resistor subunits 321 and the plurality of pull-down resistor subunits 322, respectively, to implement voltage division processing on the threshold voltage signal, the initial voltage signal, and the reference voltage signal, and output a ramp voltage signal. The application implements the control of the voltage of the output ramp voltage signal, and the control is realized by hardware circuits, so that the implementation mode is simple, and the cost is low.
In one embodiment, pull-up resistance subunit 321 includes: the first switch element and the pull-up resistor are connected in series. The pull-down resistor subunit 322 includes a second switch element and a pull-down resistor, and the second switch element and the pull-down resistor are connected in series.
In this embodiment, a first end of the first switch element is connected to the threshold voltage generating module 20, a second end of the first switch element is connected to the pull-down resistor in series and then connected to a first end of the pull-down resistor, a second end of the pull-down resistor is connected to the second switch element in series and then connected to the switch switching unit 31, and a control end of the first switch element and a control end of the second switch element are both connected to the soft-start slope control module 10 for receiving a plurality of soft-start control signals. The plurality of soft-start control signals may be used to control on or off states of the first switching element and the second switching element, respectively, to implement voltage division processing on the threshold voltage signal, the initial voltage signal, and the reference voltage signal, and output a ramp voltage signal. The application implements the control of the voltage of the output ramp voltage signal, and the control is realized by hardware circuits, so that the implementation mode is simple, and the cost is low.
In one embodiment, the number of pull-up resistor subunits 321 is the same as the number of pull-down resistor subunits 322.
In this embodiment, a plurality of soft-start control signals may be used to respectively control the effects of the pull-up resistor subunit 321 and the pull-down resistor subunit 322 on voltage division of the threshold voltage signal, the initial voltage signal and the reference voltage signal. The number of the pull-up resistor subunits 321 and the number of the pull-down resistor subunits 322 are controlled to be the same, so that a plurality of soft start control signals output by the pull-up resistor subunits 321 and the pull-down resistor subunits 322 can be more regular, and the implementation mode is simpler.
In one embodiment, the difference in resistance between pull-up resistors in adjacent pull-up resistor sub-units 321 is equal.
It is understood that the resistance values between the pull-up resistors in the adjacent pull-up resistor subunits 321 are different, and the resistance values between the pull-up resistors in the adjacent pull-up resistor subunits 321 are arranged in an arithmetic progression, for example, the resistance values of the pull-up resistors in the pull-up resistor subunits 321 are 10K Ω, 20K Ω, 30K Ω, 40K Ω, 50K Ω, etc., respectively. In the present embodiment, the resistance difference between the pull-up resistors in the adjacent pull-up resistor sub-units 321 is set to be equal. The first switching elements in the corresponding plurality of pull-up resistor sub-units 321 may be turned on or off according to a voltage requirement of the output ramp voltage signal. Because the voltage of the ramp voltage signal is increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal, and the first rate and the second rate of increasing the voltage of the ramp voltage signal from the voltage of the threshold voltage signal to the voltage of the reference voltage signal are different, by setting the resistance difference between the pull-up resistors in the adjacent pull-up resistor subunits 321 to be equal, the resistance value of the resistor in the access circuit can be better controlled, so that the implementation mode is simpler.
In one embodiment, the resistance difference between the pull-down resistors in the adjacent pull-down resistor subunits 322 is the same, and the principle thereof is the same as that described above, and is not described herein again.
In one embodiment, the values of the pull-up resistors in the plurality of pull-up resistor sub-units 321 are set in equal ratio.
Specifically, the values of the pull-up resistors in the plurality of pull-up resistor subunits 321 may be 10K Ω, 20K Ω, 40K Ω, 80K Ω, 160K Ω, and the like, respectively.
In this embodiment, the first switching elements in the corresponding plurality of pull-up resistor sub-units 321 may be turned on or off according to the voltage requirement of the output ramp voltage signal. Because the voltage of the ramp voltage signal is increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal, and the first rate and the second rate at which the voltage of the ramp voltage signal is increased from the voltage of the threshold voltage signal to the voltage of the reference voltage signal are different, by setting the resistance values of the pull-up resistors in the pull-up resistor sub-units 321 in an equal ratio, the resistance values of the resistors in the access circuit can be better controlled, so that the implementation mode is simpler.
In one embodiment, the resistances of the pull-down resistors in the pull-down resistor subunits 322 are arranged in an equal ratio, and the principle is the same as that described above, and will not be described herein.
In one embodiment, the resistance of the pull-up resistor subunit 321 is equal to the resistance of the pull-down resistor subunit 322. For example, the values of the pull-up resistors in the pull-up resistor subunits 321 may be 10K Ω, 20K Ω, 40K Ω, 80K Ω, 160K Ω, etc., respectively, and the values of the pull-down resistors in the pull-down resistor subunits 322 may also be 10K Ω, 20K Ω, 40K Ω, 80K Ω, 160K Ω, etc., respectively. The resistance of the resistor in the access circuit can be controlled by setting the resistance of the pull-up resistor subunits 321 equal to the resistance of the pull-down resistor subunits 322, so that the implementation mode is simpler.
In one embodiment, referring to fig. 5, the threshold voltage generating module 20 includes: a current source I1 and a first switch tube Q1.
Specifically, a first end of the current source I1 is connected to the voltage source VCC, a second end of the current source I1 is connected to a first end of the first switch tube Q1, a second end of the first switch tube Q1 is grounded, and a control end of the first switch tube Q1 is connected to a first end of the first switch tube Q1. The control terminal of the first switching tube Q1 is used for providing a threshold voltage signal, which is denoted by V1 in the figure. In this embodiment, after the current reference signal provided by the voltage source VCC passes through the current source I1 and the first switching tube Q1, the first end and the control end of the first switching tube Q1 are shorted, so that the control end of the first switching tube Q1 is used for providing the threshold voltage signal. It can be understood that the turn-on voltage of the first switch tube Q1 is the same as the turn-on voltage of the switch tubes in the dc voltage stabilizing module 40, and when the dc voltage stabilizing module 40 includes a plurality of switch tubes of different types, the switch tube with the largest turn-on voltage is selected as the first switch tube Q1. Therefore, the threshold voltage signal can be accurately provided, and the stability of the soft start control device is improved.
In one embodiment, referring to fig. 6, the voltage dividing unit 32 includes 6 pull-up resistor subunits 321, and the pull-up resistor subunit 321 includes a first switch element and a pull-up resistor, where the first switch element may be a first switch K1, and the pull-up resistor may be a first resistor R1. The 6 pull-up resistor sub-units 321 are arranged in parallel, and the 6 pull-up resistor sub-units 321 include: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5 and a sixth switch K6.
Specifically, as shown in fig. 6, a first end of the first switch K1 is connected to the threshold voltage generation module 20, a second end of the first switch K1 is connected to a first end of the first resistor R1, a second end of the first resistor R1 is connected to the pull-down resistor subunit 322, a first end of the second switch K2 is connected to the threshold voltage generation module 20, a second end of the second switch K2 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is connected to the pull-down resistor subunit 322, a first end of the third switch K3 is connected to the threshold voltage generation module 20, a second end of the third switch K3 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to the pull-down resistor subunit 322, a first end of the fourth switch K4 is connected to the threshold voltage generation module 20, a second end of the fourth switch K4 is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to the pull-down resistor subunit 322, a second end of the fifth switch K5 is connected to the threshold voltage generation module 20, a second end of the threshold voltage generation module K6 is connected to a second end of the pull-down resistor R6, a second terminal of the pull-down resistor R5, a second resistor R6 is connected to the second terminal of the second resistor R6, and a second terminal of the pull-down resistor R6R 2, and a second terminal of the pull-down resistor R6 unit 322, and a second terminal of the sixth resistor R6, a second terminal of the sixth resistor R5 are connected to the sixth resistor R6. The control ends of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are all connected with the soft start slope control module 10, and are respectively used for receiving a plurality of soft start control signals and conducting or breaking according to the soft start control signals.
In one embodiment, referring to fig. 6, the voltage dividing unit 32 includes 6 pull-down resistor sub-units 322, the 6 pull-down resistor sub-units 322 are arranged in parallel, and the 6 pull-down resistor sub-units 322 include: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a seventh switch K7, an eighth switch K8, a ninth switch K9, a tenth switch K10, an eleventh switch K11, and a twelfth switch K12.
Specifically, a first end of the seventh resistor R7 is connected to a second end of the first resistor R1, a second end of the seventh resistor R7 is connected to a first end of the seventh switch K7, a second end of the seventh switch K7 is connected to the switch switching unit 31, a first end of the eighth resistor R8 is connected to a second end of the second resistor R2, a second end of the eighth resistor R8 is connected to a first end of the eighth switch K8, a second end of the eighth switch K8 is connected to the switch switching unit 31, a first end of the ninth resistor R9 is connected to a second end of the third resistor R3, a second end of the ninth resistor R9 is connected to a first end of the ninth switch K9, a second end of the ninth switch K9 is connected to the switch switching unit 31, a first end of the tenth resistor R10 is connected to a second end of the fourth resistor R4, a second end of the tenth resistor R10 is connected to a first end of the tenth switch K10, a second end of the tenth switch K10 is connected to a second end of the switch switching unit 31, a second end of the eleventh resistor R11 is connected to a second end of the twelfth switch K12, a second end of the twelfth switch R12 is connected to a second end of the twelfth switch K11, and a second end of the twelfth switch K12 is connected to a second switch K12. Control ends of the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11 and the twelfth switch K12 are all connected with the soft start slope control module 10, and are respectively used for receiving a plurality of soft start control signals and conducting or breaking according to the soft start control signals.
In one embodiment, as shown with reference to fig. 6, the switch switching unit 31 includes: a thirteenth switch K13 and a fourteenth switch K14.
Specifically, a first terminal of the thirteenth switch K13 is connected to the initial voltage generating module 50 (for example, shown by V0 in fig. 6), a second terminal of the thirteenth switch K13 is connected to the pull-down resistor subunit 322, a first terminal of the fourteenth switch K14 is connected to the reference voltage generating module 60 (for example, shown by vref in fig. 6), a second terminal of the fourteenth switch K14 is connected to the pull-down resistor subunit 322, and control terminals of the thirteenth switch K13 and the fourteenth switch K14 are both connected to the soft-start slope control module 10, and are configured to be turned on or off according to the slope switching signal.
In one embodiment, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are set in equal ratio, and are 320K Ω, 160K Ω, 80K Ω, 40K Ω, 20K Ω, and 10K Ω, respectively. The resistances of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 are set in equal ratio, and are respectively 320K omega, 160K omega, 80K omega, 40K omega, 20K omega and 10K omega.
Specifically, fig. 7 shows a plurality of soft-start control signals and slope switching signals generated by the soft-start slope control module 10, and fig. 8 shows developed waveforms of the plurality of soft-start control signals and slope switching signals, where, referring to fig. 6, 7 and 8, [ sel _ V0] and [ sel _ vref ] are slope switching signals for controlling the operating states of the thirteenth switch K13 and the fourteenth switch K14, for example, controlling the on or off of the thirteenth switch K13 and the fourteenth switch K14. And [ d <0> ], [ d <1> ], [ d <2> ], [ d <3> ], [ d <4> ], [ d <5> ] are soft-start control signals for correspondingly controlling the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 to be switched off or switched on. For example, [ d <0> ] is used to control the on or off of the first switch K1, and [ d <1> ] is used to control the on or off of the second switch K2. The [ db <0> ], [ db <1> ], [ db <2> ], [ db <3> ], [ db <4> ], [ db <5> ] are also soft-start control signals for correspondingly controlling the opening or closing of the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11 and the twelfth switch K12. For example [ db <0> ] is used to control the seventh switch K7 to be turned on or off.
In one embodiment, referring to fig. 6, 7 and 8, vss represents ground, i.e. the voltage is 0V in fig. 6, V1 represents the threshold voltage signal generated by the threshold voltage generation module 20 in fig. 6, and V0 represents the initial voltage signal. Fig. 9 is an enlarged waveform diagram of a plurality of soft-start control signals and slope switching signals generated by the soft-start slope control module 10 in the initial power-up stage. At the initial power-on time, sel _ V0= "1", that is, the thirteenth switch K13 is closed, sel _ vref = "0", that is, the fourteenth switch K14 is open, d [5 ] =0, db [5 ] =0 × 0, db [ 0] =0x3f, when the 6 pull-down resistor subunits 322 are connected to V0, the 6 pull-up resistor subunits 321 are connected to V1, the switches in the 6 pull-down resistor subunits 322 are all closed, the switches in the 6 pull-up resistor subunits 321 are all open, and the output ramp voltage signal is represented by vref _ ss, when vref _ ss = V0, that is, when the voltage of the output ramp voltage signal is 0V.
In one embodiment, fig. 10 is an enlarged waveform diagram of a plurality of soft-start control signals and a slope switching signal generated by the soft-start slope control module 10 during the process that the voltage of the ramp voltage signal is increased from the voltage of the initial voltage signal to the voltage of the threshold voltage signal at a first rate and then is increased from the voltage of the threshold voltage signal to the voltage of the reference voltage signal at a second rate. Specifically, while the voltage of the ramp voltage signal rises to the voltage of the threshold voltage signal, the thirteenth switch K13 is kept closed, the fourteenth switch K14 is opened, while the d [5 ] drives the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 to be gradually opened in sequence in accordance with the code, and db [5 ] drives the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 to be gradually closed in sequence in accordance with the code, and at this time vref _ ss gradually rises from V0 to V1.
In one embodiment, in the process of the voltage of the ramp voltage signal rising from the voltage of the threshold voltage signal to the voltage of the reference voltage signal, sel _ V0= "0", sel _ vref = "1", when the thirteenth switch K13 is opened, the fourteenth switch K14 is closed, when the signal accessed by the 6 pull-down resistor subunits 322 is switched from the initial voltage signal (V0) to the reference voltage signal (vref), the 6 pull-up resistor subunits 321 keep the accessed threshold voltage signal (V1) unchanged, d [5 ] drives the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 to be gradually closed in sequence according to the code, db [5 ] drives the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 to be gradually opened in sequence according to the code, and the output ramp voltage signal is gradually increased from the voltage of the threshold voltage signal (vref) to the reference voltage (V1). Therefore, the purpose that the voltage of the output ramp voltage signal is gradually increased at a controllable speed is achieved, and the soft start of the voltage of the output ramp voltage signal is achieved.
In one embodiment, referring to fig. 11, after the voltage of the ramp voltage signal is increased to the voltage of the reference voltage signal, the voltage of the ramp voltage signal output by the ramp voltage generating module 30 remains stable at the voltage of the reference voltage signal. Specifically, the soft-start slope control module 10 outputs sel _ V0= "0", that is, the thirteenth switch K13 is open, sel _ vref = "1", that is, the fourteenth switch K14 is closed, d [5 ] =0x0, db 5 ] =0x3f, when 6 pull-down resistor subunits 322 are connected to vref,6 pull-up resistor subunits 321 are connected to V1, the seventh switch K7, the eighth switch K8, the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 are all turned on, vref _ ss = vref, and the power-on soft start ends.
In an embodiment, referring to fig. 12, the upper waveform in the figure is a voltage waveform diagram (such as the waveform diagram denoted by vref _ ss in fig. 12) of the ramp voltage signal generated by the ramp voltage generating module 30 according to a plurality of soft start control signals, slope switching signals, threshold voltage signals, initial voltage signals and reference voltage signals, and the lower waveform in the figure is a voltage waveform diagram (such as the waveform diagram denoted by v1p5 in fig. 12) of the supply voltage output by the dc voltage stabilizing module 40 adjusting the gain of the ramp voltage signal according to the received gain control signal, wherein in this embodiment, the voltage gain of the ramp voltage signal by the dc voltage stabilizing module 40 is only doubled; it can be seen that the speed of the voltage of the ramp voltage signal is relatively small before reaching the voltage of the threshold voltage signal, and when the voltage of the ramp voltage signal is increased to the voltage of the reference voltage signal after reaching the voltage of the threshold voltage signal, the speed is relatively large, so that on one hand, a soft start effect on the voltage of the output ramp voltage signal is realized, and on the other hand, the soft start time is also reduced.
In one embodiment, referring to fig. 13, the upper waveform in the figure is a voltage waveform diagram (e.g., a waveform diagram denoted by vref _ ss in fig. 13) of the ramp voltage signal generated by the ramp voltage generating module 30 according to a plurality of soft start control signals, slope switching signals, threshold voltage signals, initial voltage signals and reference voltage signals, and the lower waveform in the figure is a waveform diagram (e.g., a waveform diagram denoted by v1p5 in fig. 13) of the supply voltage output by the dc voltage stabilizing module 40 according to the received gain control signal to adjust the gain of the ramp voltage signal. In this embodiment, the dc voltage stabilizing module 40 gains the ramp voltage signal of 1.2V to the supply voltage of 1.5V and outputs the signal; it can be seen that the speed of the voltage of the ramp voltage signal is relatively small before reaching the voltage of the threshold voltage signal, and when the voltage of the ramp voltage signal is increased to the voltage of the reference voltage signal after reaching the voltage of the threshold voltage signal, the speed is relatively large, so that on one hand, a soft start effect on the voltage of the output ramp voltage signal is achieved, and on the other hand, the soft start time is also reduced.
An embodiment of the present application further provides a power supply system, including the soft start control device according to any one of the above descriptions.
In this embodiment, the soft start control device is integrated into the power supply system, so as to achieve the effect of soft start of the power supply voltage output by the power supply system, wherein the soft start slope control module 10 is configured to output a plurality of soft start control signals and slope switching signals for the encoder in a simple and convenient manner, thereby simplifying the overall structure of the power supply system and reducing the overall cost. The voltage of the ramp voltage signal is increased according to the first rate and the second rate respectively in the increasing process, the time that the voltage of the ramp voltage signal reaches the voltage of the reference voltage signal is greatly reduced while the electric load is prevented from being impacted by large current, and therefore the time of the power supply system for performing soft start is shortened.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A soft start control apparatus, characterized by comprising:
the soft start slope control module is used for receiving a soft start configuration signal and generating a plurality of soft start control signals and slope switching signals according to the soft start configuration signal;
the threshold voltage generation module is used for receiving the current reference signal and generating a threshold voltage signal according to the current reference signal;
a ramp voltage generating module, connected to the soft start slope control module and the threshold voltage generating module, respectively, for generating a ramp voltage signal according to the plurality of soft start control signals, the slope switching signal, the threshold voltage signal, the initial voltage signal, and the reference voltage signal; after the voltage of the initial voltage signal is increased to the voltage of the threshold voltage signal according to a first rate, the voltage of the ramp voltage signal is increased to the voltage of the reference voltage signal according to a second rate;
and the direct current voltage stabilizing module is connected with the ramp voltage generating module and used for receiving the ramp voltage signal and adjusting the gain of the ramp voltage signal according to the received gain control signal.
2. A soft-start control apparatus as claimed in claim 1, wherein the first rate is less than the second rate.
3. The soft-start control device of claim 1, wherein the ramp voltage generation module comprises:
the switch switching unit is connected with the soft start slope control module and is used for receiving the slope switching signal, the initial voltage signal and the reference voltage signal and switching the access states of the initial voltage signal and the reference voltage signal according to the slope switching signal;
and the voltage dividing unit is connected with the switch switching unit, the soft start slope control module and the threshold voltage generation module, and is used for receiving the initial voltage signal, the reference voltage signal, the threshold voltage signal and a plurality of soft start control signals, dividing the threshold voltage signal, the initial voltage signal and the reference voltage signal according to the plurality of soft start control signals, and outputting the ramp voltage signal.
4. The soft-start control device of claim 3, wherein the voltage dividing unit comprises a plurality of pull-up resistor sub-units and a plurality of pull-down resistor sub-units connected in series with the pull-up resistor sub-units;
the plurality of pull-up resistor subunits are connected in parallel, the plurality of pull-down resistor subunits are connected in parallel, and the plurality of soft start control signals are used for adjusting the resistance value ratio between the plurality of pull-up resistor subunits and the plurality of pull-down resistor subunits.
5. The soft-start control device of claim 4, wherein the pull-up resistance subunit comprises: a first switching element and a pull-up resistor, wherein the first switching element and the pull-up resistor are connected in series;
the pull-down resistor subunit comprises a second switch element and a pull-down resistor, and the second switch element is connected with the pull-down resistor in series.
6. The soft-start control device of claim 4, wherein the number of pull-up resistor sub-units is the same as the number of pull-down resistor sub-units.
7. The soft-start control device of claim 5, wherein the difference in resistance between pull-up resistors in adjacent pull-up resistor sub-units is equal.
8. The soft-start control device of claim 5, wherein the pull-up resistors in the plurality of pull-up resistor sub-units are arranged in equal ratio.
9. The soft-start control device of claim 5, wherein the plurality of pull-up resistor sub-units have a resistance equal to the plurality of pull-down resistor sub-units.
10. A power supply system comprising a soft start control apparatus as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211542077.2A CN115864812A (en) | 2022-12-02 | 2022-12-02 | Soft start control device and power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211542077.2A CN115864812A (en) | 2022-12-02 | 2022-12-02 | Soft start control device and power supply system |
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| CN115864812A true CN115864812A (en) | 2023-03-28 |
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| CN202211542077.2A Pending CN115864812A (en) | 2022-12-02 | 2022-12-02 | Soft start control device and power supply system |
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