CN113342112B - Reference voltage control device and method and electronic equipment - Google Patents
Reference voltage control device and method and electronic equipment Download PDFInfo
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- CN113342112B CN113342112B CN202110696066.9A CN202110696066A CN113342112B CN 113342112 B CN113342112 B CN 113342112B CN 202110696066 A CN202110696066 A CN 202110696066A CN 113342112 B CN113342112 B CN 113342112B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
The invention discloses a reference voltage control device, a reference voltage control method and electronic equipment, wherein the reference voltage control device comprises the following components: the voltage dividing unit is used for sampling the output voltage of the reference voltage generating unit to obtain a first divided voltage and a second divided voltage; the first sampling capacitor is used for sampling the first divided voltage to obtain a first sampling voltage; the second sampling capacitor is used for sampling a second divided voltage to obtain a second sampling voltage; taking a sampling voltage with small voltage change rate in the first sampling voltage and the second sampling voltage as a base reference voltage; and the comparison unit is used for outputting comparison signals according to the first sampling voltage and the second sampling voltage, controlling the reference voltage generation unit to start or stop working, and controlling the first switch and the second switch to be switched on or off. According to the invention, the plurality of sampling capacitors are arranged, and the reference voltage is maintained in a smaller fluctuation range by adjusting the leakage currents of different sampling capacitors, so that the static power consumption is reduced, the reference voltage precision is improved, and the control effect is improved.
Description
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to a reference voltage control device, a reference voltage control method, and an electronic apparatus.
Background
The reference voltage source is a device for providing a reference voltage, and in electronic devices such as a linear voltage stabilizing circuit and a switching power supply, the reference voltage provided by the reference voltage source is compared with a real-time sampling voltage to generate a feedback control signal for adjusting an output voltage. Therefore, reference voltage accuracy and power consumption of the reference voltage source are critical.
At present, in order to reduce the static power consumption of the reference voltage source to the maximum extent, a sampling and holding method is generally adopted, and the basic principle is that the reference voltage source works in a normal state, outputs a reference voltage, and samples the voltage value through a capacitor; in an idle state, the reference voltage source stops working, no reference voltage is output, no current is consumed, and meanwhile, a switch between the sampling capacitor and the reference voltage source is disconnected, so that the sampling capacitor still keeps the reference voltage before being disconnected for other circuits to use, and the following problems exist:
in the prior art, an insulated gate field effect transistor (MOSFET) is generally adopted as a switch between a sampling capacitor and a reference voltage source, when the MOSFET switch is in an off state, a voltage difference exists between a source and a drain, a leakage current is generated, if the MOSFET switch is turned off for a long time, a sampling voltage on the sampling capacitor is offset, for example, in 1 second, a leakage current of 10fA can cause a voltage offset of 10mV on a 1pF capacitor, resulting in reference voltage misalignment, and when the reference voltage is recovered, a current consumed by the reference voltage source is larger, resulting in an increase in reference voltage source power consumption.
Disclosure of Invention
The invention provides a reference voltage control device, which solves the problem of larger power consumption of the existing reference voltage source, and is beneficial to shortening the working time of the reference voltage source in an idle state and reducing the static power consumption.
In a first aspect, an embodiment of the present invention provides a reference voltage control apparatus, including: the device comprises a reference voltage generating unit, a voltage dividing unit, a first sampling unit, a second sampling unit and a comparison unit, wherein the first sampling unit comprises a first sampling capacitor and a first switch, and the second sampling unit comprises a second sampling capacitor and a second switch; the voltage dividing unit is used for sampling the output voltage of the reference voltage generating unit, and is provided with a first sampling node and a second sampling node, wherein the first voltage dividing voltage of the first sampling node is lower than the second voltage dividing voltage of the second sampling node; the first sampling capacitor is electrically connected with the first sampling node through the first switch and is used for sampling the first divided voltage to obtain a first sampling voltage; the second sampling capacitor is electrically connected with the second sampling node through the second switch and is used for sampling the second divided voltage to obtain a second sampling voltage; the difference value between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage is larger than a preset difference value threshold, and the sampling voltage with small voltage change rate in the first sampling voltage and the second sampling voltage is used as a base reference voltage; the comparison unit is used for outputting comparison signals according to the first sampling voltage and the second sampling voltage, and the comparison signals are used for controlling the reference voltage generation unit to start or stop working and controlling the first switch and the second switch to be turned on or turned off.
Optionally, the first sampling capacitance value of the first sampling capacitance is greater than or less than the second sampling capacitance value of the second sampling capacitance.
Optionally, the first switch has a size smaller or larger than the second switch.
Optionally, the reference voltage control device further includes a delay driving circuit, where the delay driving circuit is configured to delay control on or off of the first switch and the second switch according to the comparison signal.
Optionally, the delay driving circuit includes a timing unit and a logic nor circuit, a first input end of the logic nor circuit is electrically connected with an output end of the comparing unit, a second input end of the logic nor circuit is electrically connected with an output end of the comparing unit through the timing unit, an output end of the logic nor circuit is electrically connected with a control end of the first switch and a control end of the second switch, and the logic nor circuit is used for controlling the first switch and the second switch to be turned on when the timing time reaches a preset delay time.
Optionally, the reference voltage control apparatus further includes: the auxiliary sampling unit comprises an auxiliary switch and an auxiliary capacitor, wherein the auxiliary switch is arranged between a switch corresponding to the reference voltage and a sampling node in series, a first end of the auxiliary capacitor is electrically connected with the auxiliary switch, and a second end of the auxiliary capacitor is grounded.
Optionally, the reference voltage control apparatus further includes: the input end of the logic NOT gate circuit is electrically connected with the output end of the comparison unit, the output end of the logic NOT gate circuit is electrically connected with the enabling end of the reference voltage generation unit, and the logic NOT gate circuit is used for controlling the reference voltage generation unit to start working when the comparison signal is a low-level signal.
Optionally, the intrinsic response time of the comparison unit is greater than the charging time required for the base reference voltage to recover to a preset reference voltage value.
In a second aspect, an embodiment of the present invention further provides a reference voltage control method, including the following steps:
sampling the output voltage of a reference voltage generating unit to obtain a first divided voltage and a second divided voltage, wherein the first divided voltage is lower than the second divided voltage;
acquiring a first sampling voltage corresponding to the first divided voltage and a second sampling voltage corresponding to the second divided voltage, wherein the difference between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage is larger than a preset difference threshold value, and determining the sampling voltage with small voltage change rate as a base reference voltage;
And controlling the reference voltage generating unit to start or stop working according to the comparison result of the first sampling voltage and the second sampling voltage, and controlling the first switch and the second switch to be switched on or off.
In a third aspect, an embodiment of the present invention further provides an electronic device, including: the reference voltage control device.
The electronic equipment provided by the embodiment of the invention is provided with a reference voltage control device, wherein the device is provided with a reference voltage generation unit, a voltage division unit, a first sampling unit, a second sampling unit and a comparison unit, and the voltage division unit is used for sampling the output voltage of the reference voltage generation unit to obtain a first divided voltage and a second divided voltage, and the first divided voltage is lower than the second divided voltage; sampling the first divided voltage through a first sampling capacitor to obtain a first sampling voltage; sampling a second divided voltage through a second sampling capacitor to obtain a second sampling voltage; setting a difference value between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage to be larger than a preset difference value threshold, wherein a sampling voltage with a small voltage change rate in the first sampling voltage and the second sampling voltage is used as a base reference voltage; the comparison unit outputs a comparison signal according to the comparison result of the first sampling voltage and the second sampling voltage, controls the reference voltage generation unit to start or stop working, controls the first switch and the second switch to be turned on or off, solves the problem of larger power consumption of the existing reference voltage source, maintains the reference voltage in a smaller fluctuation range, shortens the working time of the reference voltage source in an idle state, reduces the current loss in the idle state, is beneficial to reducing static power consumption, improves the reference voltage precision and improves the control effect.
Drawings
Fig. 1 is a schematic structural diagram of a reference voltage control device according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of another reference voltage control device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a reference voltage control apparatus according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a reference voltage control apparatus according to a first embodiment of the present invention;
FIG. 5 is a flowchart of a reference voltage control method according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a reference voltage control device according to a first embodiment of the present invention, where the embodiment is applicable to an application scenario in which the sampling capacitor of a reference voltage source is charged at regular time based on the adjustment of leakage time, so as to achieve the technical effects of shortening the working time of the reference voltage source in an idle state and reducing the static power consumption of the reference voltage source.
As shown in fig. 1, the reference voltage control apparatus 00 includes: the reference voltage generating unit 10, the voltage dividing unit 20, the first sampling unit 30, the second sampling unit 40 and the comparing unit 50, wherein if the reference voltage source is controlled to normally operate according to the peripheral circuit, the reference voltage generating unit 10 outputs a voltage to the outside; if the reference voltage source is in an idle state according to the control of the peripheral circuit, which may be a switching power supply or a circuit employing the reference voltage as a control reference in the linear voltage regulator, the reference voltage generation unit 10 stops outputting the voltage to the outside.
Alternatively, as shown in fig. 1, the voltage dividing unit 20 is configured to sample the output voltage of the reference voltage generating unit 10, and the voltage dividing unit 20 may generate at least two divided voltages by using resistor voltage division or other voltage division methods.
Preferably, referring to FIG. 1 in combination, the voltage dividing unit 20 may include a first sampling resistor R connected in series 1 Second sampling resistor R 2 And a third sampling resistor R 3 Wherein, a first sampling resistor R 1 A first sampling resistor R is grounded 1 And a second sampling resistor R 2 A second sampling resistor R electrically connected to the first terminal of 2 Second end of (a) and third sampling resistor R 3 A third sampling resistor R electrically connected to the first end of 3 A first sampling resistor R electrically connected to the output terminal of the reference voltage generating unit 10 1 And a second sampling resistor R 2 A first sampling node A and a second sampling resistor R are arranged between the first sampling node A and the second sampling resistor R 2 And a third sampling resistor R 3 A second sampling node B is arranged between the first sampling node B and the second sampling node B, if the output voltage V of the reference voltage generating unit 10 is defined BG First sampling resistor R 1 The resistance value of (2) is R10, the second sampling resistor R 2 The resistance value of (2) is R20, the third sampling resistor R 3 The resistance value of (2) is R30, the first divided voltage V L Equal to
A second divided voltage V H Equal to->
A first divided voltage V of a first sampling node A L A second divided voltage V lower than the second sampling node H 。
Alternatively, as shown in fig. 1, the first sampling unit 30 includes a first sampling capacitor C1 and a first switch SW 30 The second sampling unit 40 includes a second sampling capacitor C2 and a second switch SW 40 The method comprises the steps of carrying out a first treatment on the surface of the The first sampling capacitor C1 passes through the first switch SW 30 A first sampling capacitor C1 electrically connected to the first sampling node A for sampling the first divided voltage V L Obtaining a first sampling voltage V REFL_SMP The method comprises the steps of carrying out a first treatment on the surface of the The second sampling capacitor C2 passes through the second switch SW 40 And second productionThe sampling node B is electrically connected, and a second sampling capacitor C2 is used for sampling a second voltage division voltage V H Obtaining a second sampling voltage V REFH_SMP The method comprises the steps of carrying out a first treatment on the surface of the First sampling voltage V REFL_SMP And the voltage change rate of the second sampling voltage V REFH_SMP The difference value between the voltage change rates of the first sampling voltage and the second sampling voltage is larger than a preset difference value threshold value, and the sampling voltage with small voltage change rate in the first sampling voltage and the second sampling voltage is determined to be a base reference voltage; the comparing unit 50 is used for sampling the voltage V according to the first sampling voltage REFL_SMP Second sampling voltage V REFH_SMP A comparison signal CMP is outputted for controlling the start or stop of the reference voltage generating unit 10 and controlling the first switch SW 30 A second switch SW 40 On or off.
In this embodiment, the preset difference threshold between the voltage change rates of the sampling voltages satisfies: first sampling voltage V REFL_SMP Divided by the second sampled voltage V REFH_SMP The ratio of the voltage change rate of (2) is much greater than 1, or the second sampling voltage V REFH_SMP Divided by the first sampled voltage V REFL_SMP The ratio of the voltage change rate of (2) is far greater than 1, the first sampling voltage V REFL_SMP Or a second sampling voltage V REFH_SMP The sampling voltage with small medium voltage change rate is used as a reference voltage to be provided for a peripheral circuit, so that the voltage offset of the reference voltage caused by leakage current is reduced, the charging working time of a reference voltage source in an idle state is shortened, and the static power consumption required by capacitor charging in the idle state is reduced.
Specifically, when the reference voltage source is operating normally, the reference voltage generating unit 10 is operating normally, the first switch SW 30 And a second switch SW 40 Turn on, reference voltage generating unit 10 outputs voltage V BG Through a first switch SW 30 Charge the first sampling capacitor C1 and pass through the second switch SW 40 Charging the second sampling capacitor C2 to make the first sampling voltage V REFL_SMP Equal to the first divided voltage V L And a second sampling voltage V REFH_SMP Equal to the second divided voltage V H The first sampling capacitor C1 or the second sampling capacitor C2 is used for externally providing the reference voltage.
When the reference voltage source is in an idle state, the reference voltage generating unit 10 stops working, and the first divided voltage V L With a second voltage dividing voltage V H All become 0, the first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP All maintain the sampling voltage (i.e. the first divided voltage V L And a second voltage dividing voltage V H ) Causes the first switch SW 30 A voltage difference occurs between the source and the drain of the transistor, and a first leakage current I is generated LKG_1 A second switch SW 40 A voltage difference occurs between the source and the drain of the transistor, and a second leakage current I is generated LKG_2 First sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP Gradually decreases under the action of leakage current.
Due to the first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP The voltage change rate of the voltage is greatly different, the sampling voltage with a faster voltage change rate is rapidly reduced, and the first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP Respectively connected to the positive and negative input terminals of the comparing unit 50, when the first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP When the comparison signals CMP outputted from the comparison unit 50 are equal, the comparison signals CMP are turned over, for example, when the level state of the comparison signals CMP is changed from the high level to the low level, the reference voltage generation unit 10 is controlled to start the operation, and the first switch SW is controlled 30 And a second switch SW 40 Opening. After a period of charging, a first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP To restore the voltage value in the normal operation state, the level state of the comparison signal CMP is changed from the low level to the high level, the reference voltage generating unit 10 is controlled to stop the operation, and the first switch SW is controlled 30 And a second switch SW 40 And (5) switching off. After a period of leakage, a first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP The comparison signal CMP outputted from the comparison unit 50 is sent againThe process is repeated until the reference voltage source leaves the idle state. If the total time of starting the reference voltage generating unit 10 in the idle state is defined as T1, the total time of stopping the reference voltage generating unit 10 is defined as T2, the leakage current corresponding to the reference voltage is smaller, the downtime T2 of the reference voltage generating unit 10 is enabled to be greater than the working time T1, the average current value in the idle state is reduced by prolonging the downtime of the reference voltage generating unit 10 in the idle state, the problem that the power consumption of the idle state of the existing reference voltage source is larger is solved, the output reference voltage is maintained in a smaller fluctuation range, the charging working time in the idle state of the reference voltage source is shortened, the static power consumption is reduced, the reference voltage precision is improved, and the control effect is improved.
Optionally, the resistance R10 of the first resistor R1 is smaller than the third sampling resistor R 3 Resistance value R30 of the second sampling resistor R 2 The resistance value R20 of (2) is smaller than the third sampling resistor R 3 To reduce the first divided voltage V L With a second voltage dividing voltage V H Voltage difference between them.
Specifically, when the level state of the comparison signal CMP is inverted, the first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP If the voltage variation value across the first capacitor C1 is defined as DeltaV 1 The voltage variation value of the two ends of the second capacitor C2 is DeltaV 2 Then the first divided voltage V L Second voltage divider V H 、ΔV 1 And DeltaV 2 Satisfying equation one as shown below:
V L -ΔV 1 ＝V H -ΔV 2 (equation I)
Wherein, the liquid crystal display device comprises a liquid crystal display device,
or->
As can be seen by combining equation one, the first voltage division can be adjustedPressure V L With a second voltage dividing voltage V H The voltage difference therebetween can further reduce the time for which the reference voltage generating unit 10 starts operating in the idle state.
Further, within the preset discharging time DeltaT, the voltage variation DeltaV across the first capacitor C1 1 And the voltage change value delta V of the two ends of the second capacitor C2 2 The following formulas two and three are correspondingly satisfied:
wherein I is LKG_1 For flowing through the first switch SW 30 Is the first leakage current of I LKG_2 For flowing through the second switch SW 40 C10 is the capacitance of the first capacitor C1, and C20 is the capacitance of the second capacitor C2.
Optionally, the first sampling capacitance value C10 of the first sampling capacitance C1 is greater than or less than the second sampling capacitance value C20 of the second sampling capacitance C2.
Specifically, the rate of change of the sampling voltage is inversely related to the corresponding capacitance, i.e., the first sampling capacitance C10 and the first sampling voltage V REFL_SMP The second sampling capacitance C20 is inversely related to the second sampling voltage V REFH_SMP Is inversely related to the rate of change of the voltage. If the first sampling voltage V REFL_SMP As a reference voltage, the capacitance of the first sampling capacitor C1 is increased and the capacitance of the second sampling capacitor C2 is decreased to make the first sampling voltage V REFL_SMP The voltage change rate of (2) is smaller than the second sampling voltage V REFH_SMP After the reference voltage generating unit 10 stops operating, the second sampling voltage V REFH_SMP Rapidly decreasing to a first sampling voltage V REFL_SMP Reducing the first sampling voltage V REFL_SMP Shortening the voltage variation of the reference voltage sourceCharging working time in idle state; if the second sampling voltage V REFH_SMP As a reference voltage, the capacitance of the first sampling capacitor C1 is reduced, and the capacitance of the second sampling capacitor C2 is increased, so that the second sampling voltage V REFH_SMP Is smaller than the first sampling voltage V REFL_SMP After the reference voltage generating unit 10 stops operating, the first sampling voltage V REFL_SMP Rapidly decreasing to the second sampling voltage V REFH_SMP Reducing the second sampling voltage V REFH_SMP The voltage variation of the reference voltage source is shortened.
Optionally, a first switch SW 30 Is smaller or larger than the second switch SW 40 Is a size of (c) a.
Specifically, under the same condition, the change rate of the sampling voltage is positively correlated with the corresponding leakage current, and the leakage current is positively correlated with the size of the corresponding switch, namely, the first switch SW 30 Is greater than the first leakage current I LKG_1 And a first switch SW 30 Is a positive correlation of the dimensions of the first leakage current I LKG_1 With a first sampling voltage V REFL_SMP Is a positive correlation of the rate of change of voltage of (a); second switch SW 40 Second leakage current I of (2) LKG_2 And a second switch SW 40 Is positively correlated with the size of the second leakage current I LKG_2 And a second sampling voltage V REFH_SMP Is positively correlated with the rate of change of the voltage. If the first sampling voltage V REFL_SMP As a base reference voltage, by reducing the first switch SW 30 And increases the size of the second switch SW 40 Is sized such that the first leakage current I LKG_1 Less than the second leakage current I LKG_2 After the reference voltage generating unit 10 stops operating, the second sampling voltage V REFH_SMP Rapidly decreasing to a first sampling voltage V REFL_SMP Reducing the first sampling voltage V REFL_SMP The voltage variation of the reference voltage source is shortened, and the charging working time in the idle state of the reference voltage source is shortened; if the second sampling voltage V REFH_SMP As a base reference voltage, by increasing the first switch SW 30 And reduces the size of the second switch SW 40 Is sized such that the first leakage current I LKG_1 Greater than the second leakage current I LKG_2 After the reference voltage generating unit 10 stops operating, a first sampling voltage V REFL_SMP Rapidly decreasing to the second sampling voltage V REFH_SMP Reducing the second sampling voltage V REFH_SMP The voltage variation of the reference voltage source is shortened.
Alternatively, if the first sampling voltage V REFL_SMP As the reference voltage, the first sampling capacitor C1 may be set to have a first sampling capacitance C10 greater than a second sampling capacitance C20 of the second sampling capacitor C2, and a first switch SW 30 Is smaller than the second switch SW 40 Is a dimension of (2); if the second sampling voltage V REFH_SMP As the reference voltage, the first sampling capacitor C1 may be set to have a first sampling capacitance C10 smaller than a second sampling capacitance C20 of the second sampling capacitor C2, and a first switch SW 30 Is larger than the second switch SW 40 Is a size of (c) a.
Specifically, if the first sampling voltage V REFL_SMP As the reference voltage, the first sampling capacitance value C10, the second sampling capacitance value C20 and the first leakage current I LKG_1 And a second leakage current I LKG_2 The method meets the following conditions: (I) LKG_2 /I LKG_1 ) (C10/C20) > 1; if the second sampling voltage V REFH_SMP As the reference voltage, the first sampling capacitance value C10, the second sampling capacitance value C20 and the first leakage current I LKG_1 And a second leakage current I LKG_2 The method meets the following conditions: (I) LKG_1 /I LKG_2 ) (C20/C10) > 1, adjusting the capacitance values of the first sampling capacitor C1 and the second sampling capacitor C2, or adjusting the voltage change rate of the first sampling voltage and the second sampling voltage by adjusting the size of a switching element connected with the first sampling capacitor C1 and the second sampling capacitor C2, triggering the start and stop of a reference voltage generating unit by adopting the sampling voltage with large change rate, and adopting the sampling voltage with small change rate as the reference voltage, maintaining the output reference voltage within a smaller fluctuation range, shortening the charging working time in the idle state of a reference voltage source, and reducing the charging working time in the idle stateThe average current value is favorable for reducing static power consumption, improving reference voltage precision and improving control effect.
Optionally, the reference voltage control device 00 further comprises a delay driving circuit for delay-controlling the first switch SW according to the comparison signal CMP 30 A second switch SW 40 Opening.
Specifically, upon the level state of the comparison signal CMP changing from the high level to the low level, the reference voltage generating unit 10 is immediately controlled to start the operation, and the preset delay time T is set to elapse D Thereafter, the first divided voltage V generated by the voltage dividing unit 20 L A second divided voltage V lower than the second sampling node H The delay driving circuit outputs a turn-on control signal to control the first switch SW 30 A second switch SW 40 The circuit is opened, so that the circuit opening time is reduced, and the power consumption is reduced.
In this embodiment, the operation mode of the reference voltage control device 00 is not affected by the connection mode of the first sampling capacitor C1 and the second sampling capacitor C2 at the input end of the comparing unit 50, and specifically, the following two circuit structures can be adopted to describe the operation process of the present invention.
Fig. 2 is a schematic structural diagram of another reference voltage control device according to the first embodiment of the present invention, as shown in fig. 2, a first sampling capacitor C1 is electrically connected to a negative input terminal of the comparing unit 50, a second sampling capacitor C2 is electrically connected to a positive input terminal of the comparing unit 50, and the reference voltage generating unit 10 is started when the comparison signal CMP is turned to a low level signal.
Optionally, as shown in fig. 2, the delay driving circuit includes a timing unit 601 and a logic nor circuit 602, a first input terminal of the logic nor circuit 602 is electrically connected to an output terminal of the comparing unit 50, a second input terminal of the logic nor circuit 602 is electrically connected to an output terminal of the comparing unit 50 through the timing unit 601, and an output terminal of the logic nor circuit 602 is electrically connected to the first switch SW 30 A second switch SW 40 The logic NOR circuit 602 is used for reaching a preset delay time T at the timing time D At the time, control the first switch SW 30 A second switch SW 40 Opening.
Optionally, as shown in fig. 2, the reference voltage control apparatus 00 further includes: the input end of the logic not gate circuit 501 is electrically connected to the output end of the comparing unit 50, the output end of the logic not gate circuit 501 is electrically connected to the enable end En of the reference voltage generating unit 10, and the logic not gate circuit 501 is used for controlling the reference voltage generating unit 10 to start working when the comparison signal CMP is a low level signal.
Specifically, the comparing unit 50 outputs a high level signal when the reference voltage source is operating normally, when the first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP When the signals are equal to each other, the comparison signal CMP outputted from the comparison unit 50 is turned over from high to low, and the low signal is changed to high by the logic not gate 501, so that the reference voltage generation unit 10 is enabled to start operation. After receiving the low level signal, the timing unit 601 starts timing, and reaches the preset delay time T D When the timing unit 601 transmits a low level signal to the second input terminal of the NOR circuit 602, so that the NOR circuit 602 outputs a high level signal to drive the first switch SW 30 A second switch SW 40 Opening. After a period of charging, a first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP The voltage value in the normal working state is recovered, the voltage of the positive electrode input end of the comparison unit 50 is higher than the voltage of the negative electrode input end, the level state of the comparison signal CMP is inverted from a low level signal to a high level signal, the high level signal is processed by the logic NOT circuit 501 to be changed into a low level signal, the enable end En of the reference voltage generating unit 10 is powered off, the reference voltage generating unit 10 stops working, and meanwhile, the first input end of the logic NOT circuit 602 receives the high level signal and outputs the low level signal to control the first switch SW 30 A second switch SW 40 Turn off and repeat this.
Fig. 3 is a schematic structural diagram of still another reference voltage control device according to the first embodiment of the present invention, as shown in fig. 3, the first sampling capacitor C1 is electrically connected to the positive input terminal of the comparing unit 50, the second sampling capacitor C2 is electrically connected to the negative input terminal of the comparing unit 50, and the reference voltage generating unit 10 is started when the comparison signal CMP is inverted to a high level signal.
Optionally, as shown in fig. 3, the delay driving circuit includes a timing unit 601 and a logic and circuit 603, a first input terminal of the logic and circuit 603 is electrically connected to an output terminal of the comparing unit 50, a second input terminal of the logic and circuit 603 is electrically connected to an output terminal of the comparing unit 50 through the timing unit 601, and an output terminal of the logic and circuit 603 is electrically connected to a first switch SW 30 A second switch SW 40 The logic AND circuit 603 is used for reaching a preset delay time T at the timing time D At the time, control the first switch SW 30 A second switch SW 40 Opening.
Specifically, when the reference voltage source works normally, the voltage of the negative input end of the comparison unit 50 is higher than the voltage of the positive input end, and the comparison signal CMP output by the comparison unit 50 is a low-level signal; when the first sampling voltage V REFL_SMP Lower than the second sampling voltage V REFH_SMP At this time, the comparison signal CMP output by the comparison unit 50 is inverted from the low level signal to the high level signal, and at this time, the output terminal of the comparison unit 50 is directly electrically connected to the enable terminal En of the reference voltage generating unit 10, and the reference voltage generating unit 10 can be enabled to start operation without providing the logic not gate circuit 501. After receiving the high level signal, the timing unit 601 starts timing, and the timing time reaches the preset delay time T D When the timing unit 601 transmits the high level signal to the second input terminal of the AND logic circuit 603, the AND logic circuit 603 outputs the high level signal to drive the first switch SW 30 A second switch SW 40 Opening. After a period of charging, a first sampling voltage V REFL_SMP And a second sampling voltage V REFH_SMP The voltage value in the normal operation state is recovered, the voltage at the negative input end of the comparison unit 50 is higher than the voltage at the positive input end, the level state of the comparison signal CMP is inverted from the high level signal to the low level signal, the enable end En of the reference voltage generating unit 10 is powered off, the reference voltage generating unit 10 stops working, and meanwhile, the first input end of the logic and circuit 603 receives the low level signal and outputs the low level signalA signal for controlling the first switch SW 30 A second switch SW 40 Turn off and repeat this.
Fig. 4 is a schematic diagram of a reference voltage control device according to a first embodiment of the present invention, in which in the embodiment shown in fig. 6, a first sampling voltage V obtained by sampling a first capacitor C1 REFL_SMP As the reference voltage, the second capacitor C2 can be used to sample the second sampling voltage V REFH_SMP As the base reference voltage, only the circuit structure is adjusted correspondingly, which is not limited.
Optionally, as shown in fig. 4, the reference voltage control apparatus further includes: the at least one auxiliary sampling unit 60, the auxiliary sampling unit 60 includes auxiliary switch and auxiliary capacitor, and auxiliary switch establishes ties and sets up between switch and the sampling node that the benchmark reference voltage corresponds, and auxiliary capacitor's first end is connected with auxiliary switch electricity, and auxiliary capacitor's second ground connection.
Alternatively, as shown in FIG. 4, the auxiliary switch may include a third auxiliary switch SW connected in series 3 Fourth auxiliary switch SW 4 … …, the (N-1) th auxiliary switch SW N-1 N-th auxiliary switch SW N The auxiliary capacitor may include a third auxiliary capacitor C 3 Fourth auxiliary capacitor C 4 … …, the (N-1) th auxiliary capacitor C N-1 Nth auxiliary capacitor C N The auxiliary capacitor is electrically connected with the auxiliary switch in a one-to-one correspondence manner.
Referring to fig. 4 in combination, an nth auxiliary switch SW N Is electrically connected with the first sampling node A, and an N-th auxiliary switch SW N Second terminal of (a) and (N-1) th auxiliary switch SW N-1 Is electrically connected to the first terminal of the third auxiliary switch SW, … … 3 Is connected to the first and fourth auxiliary switches SW 4 Electrically connected, a third auxiliary switch SW 3 And a first switch SW 30 A first switch SW electrically connected to the first end of 30 Is electrically connected to the comparing unit 50. Third auxiliary capacitor C 3 Is connected to the first and third auxiliary switches SW 3 A third auxiliary capacitor C electrically connected to the second end of the capacitor 3 A fourth auxiliary capacitor C 4 Is the first of (1)End and fourth auxiliary switch SW 4 A fourth auxiliary capacitor C electrically connected to the second terminal of (C) 4 Is grounded at the second end of (5), … …, the N-th auxiliary capacitor C N First and nth auxiliary switches SW N The second terminal of the (C) is electrically connected with the N-th auxiliary capacitor C N Is grounded.
In the present embodiment, the third auxiliary switch SW 3 Fourth auxiliary switch SW 4 … …, the (N-1) th auxiliary switch SW N-1 N-th auxiliary switch SW N And a first switch SW 30 When the voltage is sampled, all switches are simultaneously turned on, so that each sampled voltage meets the following conditions: a first divided voltage V L ＝V REFL_N ＝V REFL_N-1 ＝……＝V REFL_3 ＝V REFL_SMP The method comprises the steps of carrying out a first treatment on the surface of the While maintaining the voltage, all switches are turned off at the same time.
Specifically, when the reference voltage source is in the idle state, the reference voltage generating unit 10 stops operating, the first divided voltage V L With a second voltage dividing voltage V H All become 0, a second switch SW 40 A voltage difference exists between the source and the drain of the transistor, and a second leakage current I is generated LKG_2 N-th auxiliary switch SW N Voltage difference exists between the source and drain electrodes, and then N leakage current I is generated LKG_N No voltage difference exists between the source and the drain of the remaining switches. At the Nth leakage current I LKG_N Under the action of the N auxiliary capacitor C N Is set to be the sampling voltage V of REFL_N Slowly decreasing, N-1 th auxiliary switch SW N-1 The voltage difference is generated between the source and drain electrodes, and the N-1 leakage current I is generated LKG_N-1 In the N-1 th leakage current I LKG_N-1 Under the action of the N-1 auxiliary capacitor C N-1 Is set to be the sampling voltage V of REFL_N -1 decreases slowly. And so on to the third auxiliary capacitor C 3 Is set to be the sampling voltage V of REFL_3 Slowly decrease, resulting in a first switch SW 30 Voltage difference appears between the source and the drain, and electric leakage begins. Thereby, the auxiliary switch and the auxiliary capacitor connected in series delay the first sampling voltage V REFL_SMP The time node for starting leakage ensures the generation of reference voltage in an idle state by adjusting the number of auxiliary sampling unitsThe time for stopping the operation of the generating unit 10 is far longer than the charging time required for recovering the voltage, which is beneficial to reducing the average current value of the reference voltage source in the normal operation state, thereby reducing the power consumption of the system.
Alternatively, the intrinsic response time of the comparison unit 50 is greater than the charging time required for the base reference voltage to recover to the preset reference voltage value.
In the present embodiment, if the first sampling voltage V REFL_SMP As the reference voltage, the charging time required for the reference voltage to recover to the preset reference voltage value is the first sampling voltage V REFL_SMP Charged to a first divided voltage V L The time required; if the second sampling voltage V REFH_SMP As the reference voltage, the charging time required for the reference voltage to recover to the preset reference voltage value is the second sampling voltage V REFH_SMP Charged to a second partial voltage V H The time required.
Specifically, at a first sampling voltage V REFL_SMP As an example of the base reference voltage, the following description is given to the operation principle:
referring to fig. 2, the comparing unit 50 is always in an operating state, and after the voltage at the positive input terminal is reduced to the voltage at the negative input terminal, the level state of the comparison signal CMP is changed from a high level to a low level, and the reference voltage generating unit 10 is controlled to start operation and the first switch SW is controlled 30 And a second switch SW 40 Opening; the first sampling capacitor C1 and the second sampling capacitor C2 continuously sample the divided voltage of the corresponding sampling node, and the comparison signal CMP output by the comparison unit 50 is inverted after the intrinsic response time, and the intrinsic response time is set to be greater than the charging time, so that the first sampling voltage V REFL_SMP Charged to a first divided voltage V L Previously, the level state of the comparison signal CMP output by the comparison unit 50 remains unchanged, which is advantageous for reducing the reference voltage offset, thereby reducing the system power consumption.
Example two
The second embodiment of the invention provides a reference voltage control method,
fig. 5 is a flowchart of a reference voltage control method according to a second embodiment of the present invention.
As shown in fig. 5, the reference voltage control method includes the steps of:
step S1: and sampling the output voltage of the reference voltage generating unit to obtain a first partial voltage and a second partial voltage, wherein the first partial voltage is lower than the second partial voltage.
Step S2: the method comprises the steps of obtaining a first sampling voltage corresponding to a first divided voltage and a second sampling voltage corresponding to a second divided voltage, wherein the difference value between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage is larger than a preset difference value threshold, and determining the sampling voltage with small voltage change rate as a base reference voltage.
Step S3: and controlling the reference voltage generating unit to start or stop working according to the comparison result of the first sampling voltage and the second sampling voltage, and controlling the first switch and the second switch to be turned on or turned off.
Optionally, the first sampling capacitance value of the first sampling capacitance is greater than or less than the second sampling capacitance value of the second sampling capacitance.
Optionally, the first switch has a size smaller or larger than the second switch.
Optionally, the reference voltage control method further includes: and controlling the first switch and the second switch to be turned on or turned off according to the comparison signal delay.
Optionally, the reference voltage control method further includes: at least one auxiliary sampling unit is arranged, the auxiliary sampling unit comprises an auxiliary switch and an auxiliary capacitor, the auxiliary switch is arranged between a switch corresponding to the reference voltage and a sampling node in series, leakage current is reduced through the auxiliary sampling unit, so that the time for stopping working of the reference voltage generating unit in an idle state is far longer than the charging time of recovery voltage, and the power consumption of the system is reduced.
Optionally, the intrinsic response time of the comparison unit is greater than the charging time required for the base reference voltage to recover to a preset reference voltage value.
According to the reference voltage control method provided by the embodiment of the invention, the voltage dividing unit is used for sampling the output voltage of the reference voltage generating unit to obtain the first divided voltage and the second divided voltage, and the first divided voltage is lower than the second divided voltage; sampling the first divided voltage through a first sampling capacitor to obtain a first sampling voltage; sampling a second divided voltage through a second sampling capacitor to obtain a second sampling voltage; setting a difference value between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage to be larger than a preset difference value threshold value, and determining the sampling voltage with small voltage change rate as a base reference voltage; according to the comparison result of the first sampling voltage and the second sampling voltage, a comparison signal is output, the reference voltage generating unit is controlled to start or stop working, the first switch and the second switch are controlled to be turned on or off, the problem that the power consumption of the existing reference voltage source in an idle state is large is solved, the reference voltage is maintained in a small fluctuation range, the working time of the reference voltage source in the idle state is shortened, the average current value in the idle state is reduced, the static power consumption is reduced, the reference voltage precision is improved, and the control effect is improved.
Example III
Fig. 6 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention.
As shown in fig. 6, the electronic device 100 includes: the reference voltage control apparatus 00.
In this embodiment, the electronic device 100 may be a reference voltage source, a switching power supply, a linear regulator, or other electronic system configured with a reference voltage generator.
The electronic equipment provided by the embodiment of the invention is provided with a reference voltage control device, wherein the device is provided with a reference voltage generation unit, a voltage division unit, a first sampling unit, a second sampling unit and a comparison unit, and the voltage division unit is used for sampling the output voltage of the reference voltage generation unit to obtain a first divided voltage and a second divided voltage, and the first divided voltage is lower than the second divided voltage; sampling the first divided voltage through a first sampling capacitor to obtain a first sampling voltage; sampling a second divided voltage through a second sampling capacitor to obtain a second sampling voltage; setting a difference value between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage to be larger than a preset difference value threshold value, and determining the sampling voltage with small voltage change rate as a base reference voltage; the comparison unit outputs a comparison signal according to the comparison result of the first sampling voltage and the second sampling voltage, controls the reference voltage generation unit to start or stop working, controls the first switch and the second switch to be turned on or off, solves the problem that the power consumption of the existing reference voltage source is large in an idle state, maintains the reference voltage in a small fluctuation range, shortens the working time of the reference voltage source in the idle state, reduces the average current value in the idle state, is beneficial to reducing static power consumption, improves the reference voltage precision and improves the control effect.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A reference voltage control apparatus, comprising: the device comprises a reference voltage generating unit, a voltage dividing unit, a first sampling unit, a second sampling unit and a comparison unit, wherein the first sampling unit comprises a first sampling capacitor and a first switch, and the second sampling unit comprises a second sampling capacitor and a second switch;
the voltage dividing unit is used for sampling the output voltage of the reference voltage generating unit, and is provided with a first sampling node and a second sampling node, wherein the first voltage dividing voltage of the first sampling node is lower than the second voltage dividing voltage of the second sampling node;
The first sampling capacitor is electrically connected with the first sampling node through the first switch and is used for sampling the first divided voltage to obtain a first sampling voltage;
the second sampling capacitor is electrically connected with the second sampling node through the second switch and is used for sampling the second divided voltage to obtain a second sampling voltage;
the difference value between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage is larger than a preset difference value threshold, and the sampling voltage with small voltage change rate in the first sampling voltage and the second sampling voltage is used as a base reference voltage;
the comparison unit is used for outputting a comparison signal according to the first sampling voltage and the second sampling voltage, and the comparison signal is used for controlling the reference voltage generation unit to start or stop working and controlling the first switch and the second switch to be turned on or turned off;
further comprises: the auxiliary sampling unit comprises an auxiliary switch and an auxiliary capacitor, the auxiliary switch is arranged in series between a switch corresponding to the reference voltage and a sampling node, a first end of the auxiliary capacitor is electrically connected with the auxiliary switch, and a second end of the auxiliary capacitor is grounded;
The auxiliary sampling unit is used for delaying a time node of the electric leakage of the switch corresponding to the reference voltage and prolonging the stop time of the reference voltage generating unit;
the auxiliary switches may include third to nth auxiliary switches connected in series, wherein N is a positive integer greater than or equal to 4; the auxiliary capacitors can comprise a third auxiliary capacitor, an N auxiliary capacitor and an auxiliary switch, wherein the auxiliary capacitors are electrically connected with the auxiliary switch in a one-to-one correspondence manner; the auxiliary switch is provided with a source electrode and a drain electrode, the source electrode of the Nth auxiliary switch is electrically connected with the sampling node, the drain electrode of the Nth auxiliary switch is electrically connected with the first end of the (N-1) th auxiliary switch, the source electrode of the third auxiliary switch is electrically connected with the fourth auxiliary switch, and the drain electrode of the third auxiliary switch is electrically connected with the switch corresponding to the reference voltage;
and generating leakage current step by step from the Nth auxiliary switch to the third auxiliary switch until the switch corresponding to the reference voltage starts to leak.
2. The reference voltage control apparatus according to claim 1, wherein a first sampling capacitance value of the first sampling capacitance is larger or smaller than a second sampling capacitance value of the second sampling capacitance.
3. The reference voltage control apparatus according to any one of claims 1 or 2, wherein the first switch is smaller or larger in size than the second switch.
4. The reference voltage control apparatus of claim 1, further comprising a delay drive circuit for delay controlling the first switch and the second switch to be turned on according to the comparison signal.
5. The reference voltage control device according to claim 4, wherein the delay driving circuit comprises a timing unit and a logic nor circuit, a first input end of the logic nor circuit is electrically connected with an output end of the comparing unit, a second input end of the logic nor circuit is electrically connected with an output end of the comparing unit through the timing unit, an output end of the logic nor circuit is electrically connected with control ends of the first switch and the second switch, and the logic nor circuit is used for controlling the first switch and the second switch to be turned on when a timing time reaches a preset delay time.
6. The reference voltage control apparatus according to claim 1, characterized by further comprising: the input end of the logic NOT gate circuit is electrically connected with the output end of the comparison unit, the output end of the logic NOT gate circuit is electrically connected with the enabling end of the reference voltage generation unit, and the logic NOT gate circuit is used for controlling the reference voltage generation unit to start working when the comparison signal is a low-level signal.
7. The reference voltage control apparatus according to any one of claims 1 or 2 or 4 to 6, wherein an intrinsic response time of the comparison unit is greater than a charging time required for the reference voltage to return to a preset reference voltage value.
8. A reference voltage control method, comprising the steps of:
sampling the output voltage of a reference voltage generating unit to obtain a first divided voltage and a second divided voltage, wherein the first divided voltage is lower than the second divided voltage;
acquiring a first sampling voltage corresponding to the first divided voltage and a second sampling voltage corresponding to the second divided voltage, wherein the difference between the voltage change rate of the first sampling voltage and the voltage change rate of the second sampling voltage is larger than a preset difference threshold value, and determining the sampling voltage with small voltage change rate as a base reference voltage;
controlling the reference voltage generating unit to start or stop working according to the comparison result of the first sampling voltage and the second sampling voltage, and controlling the first switch and the second switch to be switched on or off;
the method further comprises the steps of:
the auxiliary sampling unit is adopted to delay the time node of the electric leakage starting of the switch corresponding to the reference voltage, so that the stop time of the reference voltage generating unit is prolonged;
The auxiliary sampling unit is arranged between the switch corresponding to the base reference voltage and the sampling node;
the auxiliary sampling unit comprises an auxiliary switch and an auxiliary capacitor, the auxiliary switch is arranged in series between a switch corresponding to the base reference voltage and a sampling node, a first end of the auxiliary capacitor is electrically connected with the auxiliary switch, and a second end of the auxiliary capacitor is grounded;
the auxiliary switches may include third to nth auxiliary switches connected in series, wherein N is a positive integer greater than or equal to 4; the auxiliary capacitors can comprise a third auxiliary capacitor, an N auxiliary capacitor and an auxiliary switch, wherein the auxiliary capacitors are electrically connected with the auxiliary switch in a one-to-one correspondence manner; the auxiliary switch is provided with a source electrode and a drain electrode, the source electrode of the Nth auxiliary switch is electrically connected with the sampling node, the drain electrode of the Nth auxiliary switch is electrically connected with the first end of the (N-1) th auxiliary switch, the source electrode of the third auxiliary switch is electrically connected with the fourth auxiliary switch, and the drain electrode of the third auxiliary switch is electrically connected with the switch corresponding to the reference voltage;
and generating leakage current step by step from the Nth auxiliary switch to the third auxiliary switch until the switch corresponding to the reference voltage starts to leak.
9. An electronic device, comprising: the reference voltage control apparatus according to any one of claims 1 to 7.
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| DE102007031055A1 (en) * | 2007-07-04 | 2009-01-15 | Texas Instruments Deutschland Gmbh | Method and circuit for controlling the refresh rate of sampled reference voltages |
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| US9576679B2 (en) * | 2014-10-09 | 2017-02-21 | Silicon Laboratories Inc. | Multi-stage sample and hold circuit |
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