CN114944746A - Leakage compensation circuit and method - Google Patents

Leakage compensation circuit and method Download PDF

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Publication number
CN114944746A
CN114944746A CN202210750497.3A CN202210750497A CN114944746A CN 114944746 A CN114944746 A CN 114944746A CN 202210750497 A CN202210750497 A CN 202210750497A CN 114944746 A CN114944746 A CN 114944746A
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module
constant current
voltage
port
capacitor
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CN202210750497.3A
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CN114944746B (en
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申同
苟昌华
邓莎莎
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Suzhou Inspur Intelligent Technology Co Ltd
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Suzhou Inspur Intelligent Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

Abstract

The invention discloses an electric leakage compensation circuit, belongs to the technical field of power supplies, and is used for a power supply chip with a slow start function. The circuit comprises: the device comprises a constant current charging module, a resistor, a capacitor, a function operation module and a control module. When the leakage current of the capacitor in a high-temperature and high-humidity environment increases and the output voltage is reduced, the voltage feedback signal is reduced, when the voltage feedback signal falls below the feedback threshold signal, the high level is output by the third operation port through the operation of the function operation module, the constant current charging module is turned on again, and the constant current source is enabled to charge the capacitor, so that the normal logic relation between the capacitor voltage and the feedback signal of the voltage output end is guaranteed, the drop of the output voltage is effectively prevented, and the time sequence and the use function of the chip are guaranteed to be normal.

Description

Leakage compensation circuit and method
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a leakage compensation circuit and method.
Background
In the process of electrifying the electric appliance, the power supply system can bear the rated voltage of the electric appliance and the load current of the electric appliance simultaneously in a short time. If the power-on speed is too fast, a very large load current is applied to the power supply system in a short time, so that the output power of the power supply system is instantly improved. The power supply system may suddenly become heavy and power down, resulting in system instability and even risk of damaging components on the circuit in severe cases. Therefore, the Soft Start (Soft Start) circuit is started, and after the Soft Start function is added, the power switch is gradually opened, so that the rising edge of the power voltage is relatively gentle. The power supply is slowly started, so that the softness of the rising edge of the voltage is improved, and the surge current generated when the power supply is started is limited.
In the prior art, after a system is powered on, a reference voltage is slowly established, a slow start capacitor is charged by the reference voltage through a slow start resistor matched with a constant current source, when the slow start capacitor is charged to 97% of the reference voltage, the constant current source is switched off, then the slow start capacitor is not switched on any more, and the slow start capacitor is charged to a preset voltage value by the reference voltage. The prior art can cover most application occasions, however, under certain high-temperature and high-humidity application environments, the application of the existing slow start technology can bring about the phenomenon that the output voltage suddenly drops, and further the chip time sequence is unexpected. The reason for this is that the leakage risk of the soft start capacitor in a high-temperature and high-humidity environment is increased, and the leakage current is increased. The increase of leakage current leads to logic errors between a feedback signal of the voltage output end and a sampling signal of the slow start capacitor end, so that the output voltage drops, and the chip time sequence is unexpected. Therefore, a compensation mechanism for the slow-start capacitor voltage under high temperature and high humidity conditions is needed to keep the power output voltage stable under the action of the compensation mechanism, so as to ensure the normal function of the timing chip.
Disclosure of Invention
The problems that logic errors occur among sampling signals due to leakage of a slow start capacitor in a high-temperature and high-humidity environment of a slow start circuit in the prior art, and then output voltage drops, chip time sequence accidents are caused are solved. The embodiment of the invention provides a leakage compensation circuit and a method, which are used for overcoming the problem of output voltage drop of the existing slow starting circuit in a high-temperature and high-humidity environment.
In order to solve one or more of the above technical problems, the technical solution adopted by the present invention is as follows:
in a first aspect, a leakage compensation circuit is provided, which is applied to a power chip having a slow start function, and the power chip at least includes: reference voltage module, comparator, voltage output module, its characterized in that, the circuit includes: the constant current charging module, a first resistor, a capacitor, a function operation module and a control module;
the constant current charging module comprises a first constant current port, a second constant current port and a third constant current port; the function operation module comprises a first operation port, a second operation port and a third operation port; the control module at least comprises a first control port, a second control port and a third control port;
the second constant current port is electrically connected with the output end of the reference voltage module, the third constant current port is grounded after being connected with a capacitor in series, a first resistor is connected between the second constant current port and the third constant current port in parallel, and the third constant current port is also electrically connected with the first input end of the comparator; the first operation port is electrically connected with the second input end of the comparator and used for receiving a feedback voltage signal, and the feedback voltage signal is obtained by sampling according to the output voltage of the voltage output module; the output end of the comparator is electrically connected with the first control port, the second control port is electrically connected with the second operation port and used for sending a preset feedback threshold signal to the function operation module, the third operation port is electrically connected with the first constant current port, and the third control port is electrically connected with the voltage output module and used for adjusting the numerical value of the output voltage of the voltage output module.
Further, the constant current charging module at least comprises: a transistor and a constant current source;
the transistor includes: a first pole, a second pole, and a third pole;
the first pole is used as a first constant current port and is electrically connected with the third operation port;
the second pole is used as a second constant current port, is electrically connected with the output end of the reference voltage module and is used for receiving the reference voltage output by the reference voltage module;
and the third pole is connected with the constant current source in series and then serves as a third constant current port which is electrically connected with a tap between the first resistor and the capacitor.
Further, when the first pole receives a high level, the constant current source outputs a constant current through the third constant current port;
when the first pole receives a low level, the third constant current port stops outputting current.
Further, the function operation module is configured to:
when the feedback voltage signal value is smaller than the feedback threshold signal value, the third operation port outputs a high level;
and when the feedback voltage signal value is greater than the feedback threshold signal value, the third operation port outputs low level.
Further, the feedback voltage signal is obtained by sampling the output voltage by the voltage sampling circuit.
Further, the voltage sampling circuit includes: a second resistor and a third resistor;
the voltage output end of the voltage output module is sequentially connected with the second resistor and the third resistor in series and then grounded, and the voltage at the tap of the second resistor and the tap of the third resistor is used as a feedback voltage signal.
Furthermore, the circuit also comprises a power supply indicating module which is electrically connected with the control module;
the control module is further configured to: when the feedback voltage signal value is greater than the feedback threshold signal value, outputting a high-level power supply indicating signal; when the feedback voltage signal value is smaller than the feedback threshold signal value, outputting a low-level power supply indicating signal;
the power indication module is configured to: when the power supply indicating signal sent by the control module is at a high level, the power supply indicating module is started, and when the power supply indicating signal sent by the control module is at a low level, the power supply indicating module stops working.
In a second aspect, there is provided a leakage compensation method for use in the leakage compensation circuit according to the first aspect, the method including:
when the voltage value of the capacitor is smaller than the product of the preset coefficient and the reference voltage value, the function operation module outputs a high level, and the constant current charging module is started to charge the capacitor;
when the voltage value of the capacitor rises to the product of the preset coefficient and the reference voltage value, the function operation module outputs a low level and cuts off the charging of the constant current charging module to the capacitor.
Further, the method also comprises the following steps: and electrifying a system where the electric leakage compensation circuit is positioned to enable the reference voltage module to establish a fixed reference voltage.
Further, the method further comprises: when the feedback voltage signal reaches the feedback threshold signal, the power supply is shown to be good.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
1. when the leakage current of the capacitor is increased, the voltage of the slow start capacitor drops below a feedback threshold signal, and the constant current source is restarted to charge the slow start capacitor so as to ensure the normal logic relation between the voltage of the slow start capacitor and a feedback signal of a voltage output end;
2. after the constant current source is restarted, the voltage of the slow start capacitor is quickly reestablished under the action of the constant current source and the reference voltage, the difference between a feedback voltage signal of the output voltage and the reference voltage is reduced, the signal duty ratio change of the output end of the comparator is reduced relative to the signal duty ratio change of the output end of the comparator which does not adopt the application, the change of the time sequence of a switching tube output to the voltage output module by the control module is smaller, the output voltage change is smaller, and the drop of the output voltage is effectively prevented;
3. the avoidance of the drop of the output voltage guarantees that the possibility of sudden change of the working voltage of each power utilization unit of the chip is reduced, and the time sequence and the use function of the chip in the working process are normal.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a leakage compensation circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another leakage compensation circuit provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a leakage compensation method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of examples of the present invention, and not all examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The reference numerals in the drawings in the specification merely indicate the distinction between the respective functional components or modules, and do not indicate the logical relationship between the components or modules. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Hereinafter, various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. It is to be noted that, in the drawings, the same reference numerals are given to constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted.
The problems that in the prior art, a slow start circuit is in a high-temperature and high-humidity environment, logic errors occur among sampling signals due to leakage of a slow start capacitor, and then output voltage drops, chip time sequence accidents and the like are caused are solved. The embodiment of the invention discloses a non-leakage compensation circuit and a non-leakage compensation method, which are used for overcoming the problems of output voltage drop and the like of the existing slow starting circuit in a high-temperature and high-humidity environment.
In one embodiment, as shown in fig. 1, a leakage compensation circuit is applied to a power chip with a slow start function, where the power chip at least includes: reference voltage module 1, comparator 2, voltage output module 3, its characterized in that, the circuit includes: constant current charging module 4, first resistance R 1 A capacitor C, a function operation module 5 and a control module 6;
the constant current charging module 4 comprises a first constant current port 41, a second constant current port 42 and a third constant current port 43; the function operation module 5 comprises a first operation port 51, a second operation port 52 and a third operation port 53; the control module 6 comprises at least a first control port 61, a second control port 62 and a third control port 63;
the second constant current port 42 is electrically connected with the output end 11 of the reference voltage module 1, the third constant current port 43 is grounded after being connected with a capacitor C in series, and a first resistor R is connected between the second constant current port 42 and the third constant current port 43 in parallel 1 The third constant current port 43 is further electrically connected to the first input terminal 21 of the comparator 2; the first operation port 51 is electrically connected to the second input terminal 22 of the comparator 2 for receiving the feedback voltage signal V FB Feedback voltage signal V FB According to the output voltage V of the voltage output module 3 OUT Sampling to obtain; the output end 23 of the comparator 2 is electrically connected to the first control port 61, and the second control port 62 is electrically connected to the second operation port 52, for sending a predetermined feedback threshold signal V to the function operation module 5 FBTH The third operation port 53 is electrically connected to the first constant current port 41, and the third control port 63 is electrically connected to the voltage output module 3 for adjusting the voltage output moduleOutput voltage V of block 3 OUT The numerical value of (c).
A first resistor R 1 Also known as a slow-start resistor, and the capacitor C is also known as a slow-start capacitor.
The constant current charging module 4 at least includes: a transistor 44 and a constant current source 45;
the transistor 44 may be a bipolar transistor or a field effect transistor, and the application is not limited thereto.
Preferably, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is selected as the Transistor 44.
The constant current source 45 may be implemented in the form of a current mirror, which is not limited in this application.
The transistor 44 includes: a first pole 441, a second pole 442, and a third pole 443;
for a MOSFET, the first pole 441 is a gate, the second pole 442 is a drain, and the third pole 443 is a source.
The first pole 441 is used as a first constant current port 41 and is electrically connected with the third operation port 53;
the second pole 442 is used as a second constant current port 42, electrically connected to the output terminal 11 of the reference voltage module 1, and configured to receive the reference voltage output by the reference voltage module 1;
the third pole 443 is connected in series with the constant current source 45 to serve as the third constant current port 43 and the first resistor R 1 And the tap is electrically connected with the capacitor C.
When the first pole 441 receives a high level, the constant current source 45 outputs a constant current through the third constant current port 43;
when the first pole 441 receives a low level, the third constant current port 43 stops outputting current.
The function operation block 5 is arranged to:
when the feedback voltage signal V FB Signal V with value less than feedback threshold FBTH When the value is a numerical value, the third operation port 53 outputs a high level;
when the feedback voltage signal V FB Signal V with value greater than feedback threshold FBTH When the value is positive, the third operation port 53 outputs a low level.
Feedback voltage signal V FB Output voltage V is sampled by voltage sampling circuit OUT And (6) sampling to obtain.
The voltage sampling circuit includes: a second resistor R 2 And a third resistor R 3 ；
The voltage output end of the voltage output module 3 is sequentially connected with a second resistor R in series 2 And a third resistor R 3 Rear ground, second resistor R 2 And a third resistor R 3 The voltage at the tap being used as the feedback voltage signal V FB 。
The working principle of the leakage compensation circuit is as follows:
when the chip is powered on, the internal reference voltage is gradually established, and the output end 11 of the reference voltage module 1 outputs a constant reference voltage V REF 。
The third operation port 53 is initially high, the transistor 44 is turned on, the current source 45 is connected to the first resistor R 1 Reference voltage V of REF Simultaneously charging the capacitor C when the voltage of the capacitor rises to V of a preset coefficient and a reference voltage REF When the product of (a) and (b), a feedback voltage signal V FB Reaches the feedback threshold signal V FBTH After the operation of the function operation module 5, the third operation port 53 outputs a low level, and when the first pole 441 receives a low level signal, the constant current charging module 4 is turned off to charge the capacitor C.
The above-mentioned preset coefficient is usually set to 0.97.
Thereafter, through the first resistor R 1 Reference voltage V of REF And continuously charging the capacitor C to finally reach a fixed numerical value. This value is usually set to 0.8V.
The capacitor C in the high-temperature and high-humidity environment increases beyond the leakage current, the voltage of the capacitor C is pulled down, and a voltage feedback signal V is caused FB Is pulled low when the voltage feedback signal V FB Down to feedback threshold signal V FBTH Then, after the operation of the function operation module 5, the third operation port 53 outputs a high level, the constant current charging module 4 is turned on again to charge the capacitor C by the constant current source, and the voltage of the capacitor C is recovered rapidlyThereby stabilizing the output voltage. Thereby ensuring the normal time sequence of the chip.
In another embodiment, as shown in fig. 2, the leakage compensation circuit further includes a power indication module 7, wherein the power indication module 7 is electrically connected to the control module 6;
the control module 6 is further configured to: when the feedback voltage signal V FB Signal V with value greater than feedback threshold FBTH When the value is a numerical value, outputting a high-level power supply indicating signal; when the feedback voltage signal V FB Value less than feedback threshold signal V FBTH When the value is a numerical value, outputting a low-level power supply indicating signal;
the power indication module 7 is configured to: when the power indication signal sent by the control module 6 is at a high level, the power indication module is started, and when the power indication signal sent by the control module 6 is at a low level, the power indication module 7 stops working.
And when the power supply indicating module is started to work, the power supply indicating module is used for prompting that the working state of the power supply is good. The power supply is usually indicated to be in a good working state by means of lighting a signal lamp, flashing the signal lamp, prompting by characters, prompting by sound and the like, and the specific prompting method is not limited in the application.
In another embodiment, as shown in fig. 3, a leakage compensation method is used in the leakage compensation circuit according to the first aspect, and the method includes:
step S1: when the voltage value of the capacitor is smaller than the product of the preset coefficient and the reference voltage value, the function operation module outputs a high level, and the constant current charging module is started to charge the capacitor;
step S2: when the voltage value of the capacitor rises to the product of the preset coefficient and the reference voltage value, the function operation module outputs a low level and cuts off the charging of the constant current charging module to the capacitor.
The preset coefficient referred to above is generally set to 0.97.
In another embodiment, the above leakage compensation method further includes:
step S0: and electrifying a system where the electric leakage compensation circuit is positioned to enable the reference voltage module to establish a fixed reference voltage.
In another embodiment, the method further comprises:
step S3: when the feedback voltage signal reaches the feedback threshold signal, the power supply is shown to be good.
All the above-mentioned optional technical solutions can be combined arbitrarily to form the optional embodiments of the present invention, and are not described herein again.
Example one
A leakage compensation circuit is described in detail below with reference to fig. 1.
As shown in fig. 1, the leakage compensation circuit disclosed in this embodiment is applied to a power chip having a slow start function, and the power chip at least includes: reference voltage module 1, comparator 2, voltage output module 3, its characterized in that, the circuit includes: constant current charging module 4, first resistance R 1 A capacitor C, a function operation module 5 and a control module 6;
the constant current charging module 4 comprises a first constant current port 41, a second constant current port 42 and a third constant current port 43; the function operation module 5 comprises a first operation port 51, a second operation port 52 and a third operation port 53; the control module 6 comprises at least a first control port 61, a second control port 62 and a third control port 63;
the second constant current port 42 is electrically connected with the output end 11 of the reference voltage module 1, the third constant current port 43 is grounded after being connected with a capacitor C in series, and a first resistor R is connected between the second constant current port 42 and the third constant current port 43 in parallel 1 The third constant current port 43 is further electrically connected to the first input terminal 21 of the comparator 2; the first operation port 51 is electrically connected to the second input terminal 22 of the comparator 2 for receiving the feedback voltage signal V FB Feedback voltage signal V FB According to the output voltage V of the voltage output module 3 OUT Sampling to obtain; the output end 23 of the comparator 2 is electrically connected to the first control port 61, and the second control port 62 is electrically connected to the second operation port 52, for sending a predetermined feedback threshold signal V to the function operation module 5 FBTH The third operation port 53 is electrically connected to the first constant current port 41, the third control port 63 is electrically connected to the voltage output module3 electrically connected to adjust the output voltage V of the voltage output module 3 OUT The numerical value of (c).
The constant current charging module 4 at least includes: a MOSFET44 and a constant current source 45;
the MOSFET44 includes: a first pole 441, a second pole 442, and a third pole 443;
the first pole 441 is used as a first constant current port 41 and is electrically connected with the third operation port 53;
the second pole 442 is used as a second constant current port 42, electrically connected to the output terminal 11 of the reference voltage module 1, and configured to receive the reference voltage output by the reference voltage module 1;
the third pole 443 is connected in series with the constant current source 45 as the third constant current port 43 and the first resistor R 1 And the tap is electrically connected with the capacitor C.
When the first pole 441 receives a high level, the constant current source 45 outputs a constant current through the third constant current port 43;
when the first pole 441 receives a low level, the third constant current port 43 stops outputting current.
The function operation block 5 is arranged to:
when the feedback voltage signal V FB Value less than feedback threshold signal V FBTH When the value is a numerical value, the third operation port 53 outputs a high level;
when the feedback voltage signal V FB Signal V with value greater than feedback threshold FBTH When the value is positive, the third operation port 53 outputs a low level.
Feedback voltage signal V FB Output voltage V is sampled by voltage sampling circuit OUT And (6) sampling to obtain.
The voltage sampling circuit includes: a second resistor R 2 And a third resistor R 3 ；
The voltage output end of the voltage output module 3 is sequentially connected with a second resistor R in series 2 And a third resistor R 3 Rear ground, second resistor R 2 And a third resistor R 3 The voltage at the tap being used as the feedback voltage signal V FB 。
Example two
Another leakage compensation circuit is described in detail below with reference to fig. 2.
As shown in fig. 2, the leakage compensation circuit disclosed in this embodiment is applied to a power chip having a slow start function, and the power chip at least includes: reference voltage module 1, comparator 2, voltage output module 3, its characterized in that, the circuit includes: constant current charging module 4, first resistance R 1 A capacitor C, a function operation module 5 and a control module 6;
the constant current charging module 4 comprises a first constant current port 41, a second constant current port 42 and a third constant current port 43; the function operation module 5 comprises a first operation port 51, a second operation port 52 and a third operation port 53; the control module 6 comprises at least a first control port 61, a second control port 62 and a third control port 63;
the second constant current port 42 is electrically connected with the output end 11 of the reference voltage module 1, the third constant current port 43 is grounded after being connected with a capacitor C in series, and a first resistor R is connected between the second constant current port 42 and the third constant current port 43 in parallel 1 The third constant current port 43 is further electrically connected to the first input end 21 of the comparator 2; the first operation port 51 is electrically connected to the second input terminal 22 of the comparator 2 for receiving the feedback voltage signal V FB Feedback voltage signal V FB According to the output voltage V of the voltage output module 3 OUT Sampling to obtain; the output end 23 of the comparator 2 is electrically connected to the first control port 61, and the second control port 62 is electrically connected to the second operation port 52, for sending a predetermined feedback threshold signal V to the function operation module 5 FBTH The third operation port 53 is electrically connected to the first constant current port 41, and the third control port 63 is electrically connected to the voltage output module 3 for adjusting the output voltage V of the voltage output module 3 OUT The numerical value of (c).
The constant current charging module 4 at least includes: MOSFET44 and constant current source 45;
the MOSFET44 includes: a first pole 441, a second pole 442, and a third pole 443;
the first pole 441 is used as a first constant current port 41 and is electrically connected with the third operation port 53;
the second pole 442, serving as the second constant current port 42, is electrically connected to the output end 11 of the reference voltage module 1, and is configured to receive the reference voltage output by the reference voltage module 1;
the third pole 443 is connected in series with the constant current source 45 to serve as the third constant current port 43 and the first resistor R 1 And the tap is electrically connected with the capacitor C.
When the first pole 441 receives a high level, the constant current source 45 outputs a constant current through the third constant current port 43;
when the first pole 441 receives a low level, the third constant current port 43 stops outputting current.
The function operation block 5 is arranged to:
when the feedback voltage signal V FB Signal V with value less than feedback threshold FBTH When the value is a numerical value, the third operation port 53 outputs a high level;
when the feedback voltage signal V FB Signal V with value greater than feedback threshold FBTH When the value is positive, the third operation port 53 outputs a low level.
Feedback voltage signal V FB Output voltage V is sampled by voltage sampling circuit OUT And (6) sampling to obtain.
The voltage sampling circuit includes: a second resistor R 2 And a third resistor R 3 ；
The voltage output end of the voltage output module 3 is sequentially connected with a second resistor R in series 2 And a third resistor R 3 Rear ground, second resistor R 2 And a third resistor R 3 The voltage at the tap being used as the feedback voltage signal V FB 。
The leakage compensation circuit disclosed in the embodiment further comprises a power indication module 7, wherein the power indication module 7 is electrically connected with the control module 6;
the control module 6 is further configured to: when the feedback voltage signal V FB Signal V with value greater than feedback threshold FBTH When the value is a numerical value, outputting a high-level power supply indicating signal; when the feedback voltage signal V FB Signal V with value less than feedback threshold FBTH When the value is a numerical value, outputting a low-level power supply indicating signal;
the power indication module 7 is configured to: when the power indication signal sent by the control module 6 is at a high level, the power indication module is started, and when the power indication signal sent by the control module 6 is at a low level, the power indication module 7 stops working.
EXAMPLE III
A leakage compensation method is described in detail below with reference to fig. 3.
As shown in fig. 3, a leakage compensation method includes:
step S1: when the voltage value of the capacitor is smaller than the product of the preset coefficient and the reference voltage value, the function operation module outputs a high level, and the constant current charging module is started to charge the capacitor;
step S2: when the voltage value of the capacitor rises to the product of the preset coefficient and the reference voltage value, the function operation module outputs low level and cuts off the charging of the constant current charging module to the capacitor.
The preset coefficient is set to 0.97.
Example four
Another leakage compensation method is described in detail below, and specifically includes:
step S0: and electrifying a system where the electric leakage compensation circuit is positioned to enable the reference voltage module to establish a fixed reference voltage.
Step S1: when the voltage value of the capacitor is smaller than the product of the preset coefficient and the reference voltage value, the function operation module outputs a high level, and the constant current charging module is started to charge the capacitor;
step S2: when the voltage value of the capacitor rises to the product of the preset coefficient and the reference voltage value, the function operation module outputs a low level and cuts off the charging of the constant current charging module to the capacitor.
Step S3: when the feedback voltage signal reaches the feedback threshold signal, the power supply is shown to be good.
The preset coefficient is set to 0.97. In this embodiment, the power source status is displayed in the form of providing a power source indicator lamp on the panel.
In this embodiment, a complete scheme from system power-up to power state display is described as a leakage compensation method.
In particular, according to embodiments of the application, the processes described above with reference to the flow diagrams may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program loaded on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication means, or installed from the memory, or installed from the ROM. The computer program performs the above-described functions defined in the methods of the embodiments of the present application when executed by an external processor.
It should be noted that the computer readable medium of the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In embodiments of the application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In embodiments of the present application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the foregoing.
The computer readable medium may be embodied in the server; or may exist separately and not be assembled into the server. The computer readable medium carries one or more programs which, when executed by the server, cause the server to: when the peripheral mode of the terminal is detected to be not activated, acquiring a frame rate of an application on the terminal; when the frame rate meets the screen information condition, judging whether a user is acquiring the screen information of the terminal; and controlling the screen to enter an immediate dimming mode in response to the judgment result that the user does not acquire the screen information of the terminal.
Computer program code for carrying out operations for embodiments of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific embodiments and the application range may be changed. In view of the above, the description should not be taken as limiting the application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The utility model provides a leakage compensation circuit, is applied to the power chip that has the function of slowly starting, the power chip includes at least: a reference voltage module, a comparator, a voltage output module, wherein the circuit comprises: the constant current charging module, a first resistor, a capacitor, a function operation module and a control module;
the constant current charging module comprises a first constant current port, a second constant current port and a third constant current port; the function operation module comprises a first operation port, a second operation port and a third operation port; the control module comprises at least a first control port, a second control port and a third control port;
the second constant current port is electrically connected with the output end of the reference voltage module, the third constant current port is connected with the capacitor in series and then grounded, the first resistor is connected between the second constant current port and the third constant current port in parallel, and the third constant current port is also electrically connected with the first input end of the comparator; the first operation port is electrically connected with the second input end of the comparator and used for receiving a feedback voltage signal, and the feedback voltage signal is obtained by sampling according to the output voltage of the voltage output module; the output end of the comparator is electrically connected with the first control port, the second control port is electrically connected with the second operation port and used for sending a preset feedback threshold signal to the function operation module, the third operation port is electrically connected with the first constant current port, and the third control port is electrically connected with the voltage output module and used for adjusting the value of the output voltage of the voltage output module.
2. The leakage compensation circuit of claim 1, wherein the constant current charging module comprises at least: a transistor and a constant current source;
the transistor includes: a first pole, a second pole, and a third pole;
the first pole is used as the first constant current port and is electrically connected with the third operation port;
the second pole is used as the second constant current port, is electrically connected with the output end of the reference voltage module, and is used for receiving the reference voltage output by the reference voltage module;
and the third pole is connected with the constant current source in series and then serves as the third constant current port and is electrically connected with a tap between the first resistor and the capacitor.
3. The leakage compensation circuit of claim 2, wherein said constant current source outputs a constant current through said third constant current port when said first pole receives a high level;
when the first pole receives a low level, the third constant current port stops outputting current.
4. The leakage compensation circuit of claim 1, wherein the function operation module is configured to:
when the feedback voltage signal value is smaller than the feedback threshold signal value, the third operation port outputs a high level;
and when the feedback voltage signal value is greater than the feedback threshold signal value, the third operation port outputs a low level.
5. The leakage compensation circuit of claim 1, wherein the feedback voltage signal is sampled from the output voltage by a voltage sampling circuit.
6. The leakage compensation circuit of claim 5, wherein the voltage sampling circuit comprises: a second resistor and a third resistor;
the voltage output end of the voltage output module is sequentially connected with a second resistor and a third resistor in series and then grounded, and the voltage at a tap of the second resistor and the voltage at a tap of the third resistor are used as the feedback voltage signal.
7. The leakage compensation circuit of any one of claims 1-6, further comprising a power indication module, said power indication module being electrically connected to said control module;
the control module is further configured to: when the feedback voltage signal value is larger than the feedback threshold signal value, outputting a high-level power supply indicating signal; when the feedback voltage signal value is smaller than the feedback threshold signal value, outputting a low-level power supply indicating signal;
the power indication module is configured to: when the power supply indicating signal sent by the control module is at a high level, the power supply indicating module is started, and when the power supply indicating signal sent by the control module is at a low level, the power supply indicating module stops working.
8. A leakage compensation method for use in a leakage compensation circuit according to any one of claims 1-7, the method comprising:
when the voltage value of the capacitor is smaller than the product of the preset coefficient and the reference voltage value, the function operation module outputs a high level, and the constant current charging module is started to charge the capacitor;
when the voltage value of the capacitor rises to the product of the preset coefficient and the reference voltage value, the function operation module outputs low level and cuts off the charging of the capacitor by the constant current charging module.
9. The leakage compensation method of claim 8, further comprising, prior to the step of: and electrifying a system where the electric leakage compensation circuit is positioned, so that the reference voltage module establishes a fixed reference voltage.
10. The leakage compensation method according to claim 8 or 9, further comprising: and when the feedback voltage signal reaches the feedback threshold signal, displaying that the power supply is good.
CN202210750497.3A 2022-06-28 2022-06-28 Leakage compensation circuit and method Active CN114944746B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114024434A (en) * 2021-10-13 2022-02-08 中国科学院上海微系统与信息技术研究所 Soft start and electric leakage protection circuit for power management chip
CN114142722A (en) * 2021-10-19 2022-03-04 厦门优迅高速芯片有限公司 Charge pump circuit with leakage current compensation function

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114024434A (en) * 2021-10-13 2022-02-08 中国科学院上海微系统与信息技术研究所 Soft start and electric leakage protection circuit for power management chip
CN114142722A (en) * 2021-10-19 2022-03-04 厦门优迅高速芯片有限公司 Charge pump circuit with leakage current compensation function

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