CN213661446U - Power supply circuit and clamping circuit thereof - Google Patents
Power supply circuit and clamping circuit thereof Download PDFInfo
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- CN213661446U CN213661446U CN202022193467.6U CN202022193467U CN213661446U CN 213661446 U CN213661446 U CN 213661446U CN 202022193467 U CN202022193467 U CN 202022193467U CN 213661446 U CN213661446 U CN 213661446U
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Abstract
The utility model discloses a power supply circuit and clamping circuit thereof. The clamping circuit comprises a first comparing module, a second comparing module, a third comparing module and a selecting module, and the working modes of the first comparing module, the second comparing module, the third comparing module and the selecting module ensure that only one error signal in a clamping error signal and a main loop error signal input into the selecting module at any moment forms a control loop, so that interference does not exist between the clamping circuit and the main loop, and the precision and the stability of the circuit can be improved.
Description
Technical Field
The utility model relates to a circuit measurement technical field, more specifically relate to a power supply circuit and clamping circuit thereof.
Background
The Source Measurement Unit (SMU) integrates Source and measurement, has programmable voltage/current Source, and can Measure current/voltage synchronously, and can provide not only voltage Source with resolution less than 1mV, but also current Source with measurement resolution less than 1uA, so it is widely used in many fields for accurate measurement, such as testing of semiconductor products.
The working principle of the source measuring unit is as follows: voltage/current is applied to the pins of a Device Under Test (DUT) by a source measurement unit, and measurement of dc parameters of the respective pins is simultaneously accomplished. In order to protect the device under test and improve measurement safety, source-measurement units typically include Clamp circuits (Clamp circuits) that are used to Clamp the output current or voltage at a selected level.
The working principle of the clamping circuit is as follows: and outputting a control signal according to the input clamping limit value, the clamping feedback value and the main loop error signal, limiting the clamping feedback value within a certain range, and ensuring that the main loop can normally work when the clamping feedback value is within the limited range.
Some clamping circuits of the prior art derive the control signal mainly by amplifying the clamping error signal and adding it to the main loop error signal. Such a design has the following drawbacks: (1) when clamping does not occur, the clamping circuit influences the precision of the main loop; (2) when clamping occurs, the accuracy of the clamping circuit may be reduced because of the mutual overlap between the main loop error signal and the clamping signal.
Other clamping circuits in the prior art reduce errors by increasing the amplification factor of a clamping error signal, and such design can reduce the stability of a system, so that when clamping occurs, the output of the circuit is overshot and even oscillates.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a power supply circuit and clamping circuit thereof, which not only can improve the accuracy and stability of the clamping circuit, but also has simple circuit structure and lower cost.
According to the utility model discloses an aspect provides a power supply circuit's clamp circuit, include: the first comparison module receives a first clamping setting signal and a clamping feedback signal and generates a first clamping error signal according to the first clamping setting signal and the clamping feedback signal; the second comparison module is connected with the first comparison module and used for receiving the first clamping error signal, and the second comparison module compares the first clamping error signal with a clamping control signal to generate a first comparison signal; and the selection module is connected with the second comparison module and generates the clamping control signal according to one of the first comparison signal and the main loop error signal, and the clamping control signal limits the clamping feedback signal within a preset range.
Optionally, the clamping circuit further includes: and the third comparison module receives a main loop setting signal and a main loop feedback signal and generates a main loop error signal according to the main loop setting signal and the main loop feedback signal.
Optionally, the first clamp setting signal sets an upper clamp value of the clamp feedback signal, and the selecting module selects the main loop error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is smaller than the clamp control signal, and selects the first clamp error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is greater than or equal to the clamp control signal.
Optionally, the first clamp setting signal sets a lower limit clamp value of the clamp feedback signal, and the selecting module selects the main loop error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is greater than the clamp control signal, and selects the first clamp error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is less than or equal to the clamp control signal.
Optionally, the clamping circuit further includes: the fourth comparison module receives a second clamping setting signal and the clamping feedback signal and generates a second clamping error signal according to the second clamping setting signal and the clamping feedback signal; and a fifth comparing module, connected to the fourth comparing module and the selecting module, for comparing the second clamping error signal with the clamping control signal to generate a second comparison signal, and providing the second comparison signal to the selecting module, wherein the selecting module generates the clamping control signal according to one of the first comparison signal, the second comparison signal, and the main loop error signal.
Optionally, the first clamping setting signal sets an upper clamping value of the clamping feedback signal, the second clamping setting signal sets a lower clamping value of the clamping feedback signal, and the selecting module selects the first clamping error signal as the clamping control signal when the first comparing signal indicates that the first clamping error signal is greater than or equal to the clamping control signal, and selects the second clamping error signal as the clamping control signal when the second comparing signal indicates that the second clamping error signal is less than or equal to the clamping control signal.
Optionally, the first clamping setting signal sets a lower clamping value of the clamping feedback signal, the second clamping setting signal sets an upper clamping value of the clamping feedback signal, and the selecting module selects the first clamping error signal as the clamping control signal when the first comparing signal indicates that the first clamping error signal is less than or equal to the clamping control signal, and selects the second clamping error signal as the clamping control signal when the second comparing signal indicates that the second clamping error signal is greater than or equal to the clamping control signal.
Optionally, the selection module selects the main loop error signal as the clamping control signal when the first comparison signal indicates that the first clamping error signal is smaller than the clamping control signal and the second comparison signal indicates that the second clamping error signal is larger than the clamping control signal.
Optionally, the selecting module is configured to select the main loop error signal as the clamping control signal when the second comparison signal indicates that the second clamping error signal is smaller than the clamping control signal and the first comparison signal indicates that the first clamping error signal is larger than the clamping control signal.
According to the utility model discloses an on the other hand provides a power supply circuit, include: the selection circuit generates a main loop feedback signal and a clamping feedback signal according to the current measurement signal and the voltage measurement signal; the clamping circuit is connected with the selection circuit and used for receiving the main loop feedback signal and the clamping feedback signal, and the clamping circuit generates a clamping control signal according to the main loop feedback signal, the clamping feedback signal, a main loop setting signal and a first clamping setting signal and/or a second clamping setting signal; the power amplification circuit is connected with the clamping circuit, receives the clamping control signal and performs power amplification on the clamping control signal so as to provide an output signal for a load; the measuring circuit detects the output voltage and the output current of the power supply circuit to obtain a voltage measuring signal and a current measuring signal respectively, wherein the clamping circuit comprises: the first comparison module receives a first clamping setting signal and a clamping feedback signal and generates a first clamping error signal according to the first clamping setting signal and the clamping feedback signal; the second comparison module is connected with the first comparison module and used for receiving the first clamping error signal, and the second comparison module compares the first clamping error signal with a clamping control signal to generate a first comparison signal; and the selection module is connected with the second comparison module and generates the clamping control signal according to one of the first comparison signal and the main loop error signal, and the clamping control signal limits the clamping feedback signal within a preset range.
Optionally, the clamping circuit further includes: and the third comparison module receives a main loop setting signal and a main loop feedback signal and generates a main loop error signal according to the main loop setting signal and the main loop feedback signal.
Optionally, the first clamp setting signal sets an upper clamp value of the clamp feedback signal, and the selecting module selects the main loop error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is smaller than the clamp control signal, and selects the first clamp error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is greater than or equal to the clamp control signal.
Optionally, the first clamp setting signal sets a lower limit clamp value of the clamp feedback signal, and the selecting module selects the main loop error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is greater than the clamp control signal, and selects the first clamp error signal as the clamp control signal when the first comparison signal indicates that the first clamp error signal is less than or equal to the clamp control signal.
Optionally, the clamping circuit further includes: the fourth comparison module receives a second clamping setting signal and the clamping feedback signal and generates a second clamping error signal according to the second clamping setting signal and the clamping feedback signal; and a fifth comparing module, connected to the fourth comparing module and the selecting module, for comparing the second clamping error signal with the clamping control signal to generate a second comparison signal, and providing the second comparison signal to the selecting module, wherein the selecting module generates the clamping control signal according to one of the first comparison signal, the second comparison signal, and the main loop error signal.
Optionally, the first clamping setting signal sets an upper clamping value of the clamping feedback signal, the second clamping setting signal sets a lower clamping value of the clamping feedback signal, and the selecting module selects the first clamping error signal as the clamping control signal if the first comparing signal indicates that the first clamping error signal is greater than or equal to the clamping control signal, and selects the second clamping error signal as the clamping control signal if the second comparing signal indicates that the second clamping error signal is less than or equal to the clamping control signal.
Optionally, the first clamping setting signal sets a lower clamping value of the clamping feedback signal, the second setting control signal sets an upper clamping value of the clamping feedback signal, and the selecting module selects the first clamping error signal as the clamping control signal when the first comparing signal indicates that the first clamping error signal is less than or equal to the clamping control signal, and selects the second clamping error signal as the clamping control signal when the second comparing signal indicates that the second clamping error signal is greater than or equal to the clamping control signal.
Optionally, the selection module selects the main loop error signal as the clamping control signal when the first comparison signal indicates that the first clamping error signal is smaller than the clamping control signal and the second comparison signal indicates that the second clamping error signal is larger than the clamping control signal.
Optionally, the selecting module selects the main loop error signal as the clamping control signal when the second comparison signal indicates that the second clamping error signal is smaller than the clamping control signal and the first comparison signal indicates that the first clamping error signal is larger than the clamping control signal.
Optionally, the measurement circuit includes: a current measurement circuit connected to the power amplifier to generate the current measurement signal according to an output current flowing through the load; and the voltage measuring circuit is connected with the power amplifier so as to generate the voltage measuring signal according to the output voltage of the power amplifier.
Optionally, the power supply circuit further includes: and the integrating circuit is connected with the clamping circuit and the power amplifying circuit, integrates the clamping control signal to obtain a clamping integral signal, and provides the clamping integral signal to the power amplifying circuit.
The utility model discloses in power supply circuit and clamping circuit thereof, the working method of selection module and comparison module has ensured to have and only one error signal formation control loop in the clamping error signal and the main loop error signal of input selection module at arbitrary moment for there is not the interference between clamping circuit and the main loop, thereby can improve the precision and the stability of circuit. In addition, the clamp circuit of the embodiment can complete the switching from the main loop to the clamp circuit before the clamp feedback signal reaches the limit value, and the occurrence of the situation that the output voltage is temporarily over-limited in the output regulation process can be effectively reduced. Further, the utility model discloses a clamp circuit can be realized through analog circuit hardware, and circuit structure is simple, and the cost is lower.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a clamp circuit according to a first embodiment of the present invention;
fig. 2 shows a schematic diagram of a power supply circuit according to a second embodiment of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
Numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in the following description in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It should be understood that in the following description, "circuitry" may comprise singly or in combination hardware circuitry, programmable circuitry, state machine circuitry, and/or elements capable of storing instructions executed by programmable circuitry. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Fig. 1 shows a schematic diagram of a clamp circuit according to a first embodiment of the present invention. The clamping circuit of the embodiment is composed of a plurality of comparison modules and a selection module, and for bidirectional voltage/current clamping, the comparison modules are symmetrically designed and are divided into two paths, namely an upper limit path and a lower limit path.
As shown in fig. 1, the clamp circuit 10 includes a first comparison module 1, a second comparison module 2, a third comparison module 3, and a selection module 6.
The first comparing module 1 receives the first clamping setting signal Vset1 and the clamping feedback signal Vfb2, and generates a first clamping error signal Verr1 according to the first clamping setting signal Vset1 and the clamping feedback signal Vfb 2. For example, the first comparison module 1 uses the difference between the first clamp setting signal Vset1 and the clamp feedback signal Vfb2 as the first clamp error signal Verr 1. Wherein the first clamp setting signal Vset1 is used for upper limit clamping or lower limit clamping of the clamped feedback signal Vfb 2.
The second comparing module 2 is connected to the first comparing module 1 to receive the first clamping error signal Verr1, and the second comparing module 2 compares the first clamping error signal Verr1 with the clamping control signal Vclamp to generate a first comparing signal Vcomp1 according to the comparison result.
The third comparing module 3 is configured to receive the main loop setting signal Vset3 and the main loop feedback signal Vfb1, and the third comparing module 3 is configured to compare the main loop setting signal Vset3 with the main loop feedback signal Vfb1 and generate a main loop error signal Verr3 according to the comparison result. For example, in the constant voltage current limiting mode, the voltage loop is a main loop, the clamp circuit 10 clamps the current value of the power supply circuit, the main loop setting signal Vset3 is, for example, the preset output voltage of the power supply circuit, the main loop feedback signal Vset3 is, for example, the output voltage of the power supply circuit, and the clamp feedback signal Vfb2 is, for example, the output current representing the power supply circuit; in the constant current voltage limiting mode, the current loop is a main loop, the clamping circuit 10 clamps the voltage value of the power supply circuit, the main loop setting signal Vset3 represents the output current of the preset power supply circuit, the main loop feedback signal Vset3 represents the output current of the power supply circuit, and the clamping feedback signal Vfb2 represents the output voltage of the power supply circuit.
The selection module 6 is connected to the second comparison module 2 and the third comparison module 3 to receive the first comparison signal Vcomp1 and the main loop error signal Verr3, and the selection module 6 selects to generate the clamp control signal Vclamp according to the first comparison signal Vcomp1 or the main loop error signal Verr 3. The clamp control signal Vclamp is used to limit the clamp feedback signal Vfb2 within a certain range and to keep the main loop operating properly when the clamp feedback signal Vfb2 is within the limited range.
In one embodiment, the first clamp set signal Vset1 is used to set the upper clamp value of the clamp feedback signal Vfb 2. When the first clamping error signal Verr1 is greater than or equal to the clamping control signal Vclamp, the first comparison signal Vcomp1 is a positive saturation value, the first comparison signal Vcomp1 is greater than the clamping control signal Vclamp, the selection module 6 selects to output the first clamping error signal Verr1 as the clamping control signal Vclamp, and the selection module 6 controls the clamping control signal Vclamp to increase until the clamping control signal Vclamp is equal to the first clamping error signal Verr 1; when the first clamp error signal Verr1 is smaller than the clamp control signal Vclamp, the first comparison signal Vcomp1 is a negative saturation value, the selection module 6 is not affected by the first comparison signal Vcomp1, and selects to output the main loop error signal Verr3 as the clamp control signal Vclamp.
In another embodiment, the first clamp set signal Vset1 is used to set the lower clamp value of the clamp feedback signal Vfb 2. When the first clamping error signal Verr1 is less than or equal to the clamping control signal Vclamp, the first comparison signal Vcomp1 is a negative saturation value, the first comparison signal Vcomp1 is less than the clamping control signal Vclamp, the selecting module 6 selects to output the first clamping error signal Verr1 as the clamping control signal Vclamp, and the selecting module 6 controls the clamping control signal Vclamp to decrease until the clamping control signal Vclamp is equal to the first clamping error signal Verr 1; when the first clamp error signal Verr1 is greater than the clamp control signal Vclamp, the first comparison signal Vcomp1 is a positive saturation value, the first comparison signal Vcomp1 is greater than the clamp control signal Vclamp, the selection module 6 is not affected by the first comparison signal Vcomp1, and the main loop error signal Verr3 is selected to be output as the clamp control signal Vclamp.
Further, when the clamping circuit 10 is used for bidirectional voltage/current clamping, the clamping circuit 10 further includes a fourth comparing module 4 and a fifth comparing module 5, which are symmetrically arranged with the first comparing module 1 and the second comparing module 2.
The fourth comparing module 4 receives the second clamp setting signal Vset2 and the clamp feedback signal Vfb2, and generates a second clamp error signal Verr2 according to the second clamp setting signal Vset2 and the clamp feedback signal Vfb 2. For example, the fourth comparing module 4 uses the difference between the second clamping setting signal Vset2 and the clamping feedback signal Vfb2 as the second clamping error signal Verr 2. In this embodiment, the first clamp setting signal Vset1 is used to set the upper limit clamp of the clamp feedback signal Vfb2, and the second clamp setting signal Vset2 is used to set the lower limit clamp of the clamp feedback signal Vfb 2; in other embodiments, the first clamp setting signal Vset1 is used to set the lower limit clamp for the clamp feedback signal Vfb2, and the second clamp setting signal Vset2 is used to set the upper limit clamp for the clamp feedback signal Vfb 2.
The fifth comparing module 5 is connected to the fourth comparing module 4 and the selecting module 6, the fifth comparing module 5 compares the second clamp error signal Verr2 with the clamp control signal Vclamp, and provides the second comparing signal Vcomp2 to the selecting module 6 according to the comparison result, and the selecting module 6 selects one of the first comparing signal Vcomp1, the second comparing signal Vcomp2 and the main loop error signal Verr3 to obtain the clamp control signal Vclamp.
In one embodiment, the first clamp set signal Vset1 sets an upper clamp value of the clamp feedback signal Vfb2, and the second clamp set signal Vset2 sets a lower clamp value of the clamp feedback signal Vfb 2. When the clamp feedback signal Vfb2 rises and approaches the first clamp set signal Vset1, the clamp control signal Vclamp follows the first clamp error signal Verr1, so that the clamp control signal Vclamp is controlled only by the first clamp error signal Verr 1; when the clamp feedback signal Vfb2 falls and approaches the second clamp set signal Vset2, the clamp control signal Vclamp follows the second clamp error signal Verr2, so that the clamp control signal Vclamp is controlled only by the second clamp error signal Verr 2; when the clamp feedback signal Vfb2 is between the first clamp set signal Vset1 and the second clamp set signal Vset2, the clamp control signal Vclamp is unaffected by the first clamp error signal Verr1 and the second clamp error signal Verr2, and is controlled only by the main loop error signal Verr 3.
For example, when the first comparison signal Vcomp1 indicates that the first clamp error signal Verr1 is smaller than the clamp control signal Vclamp and the second comparison signal Vcomp2 indicates that the second clamp error signal Verr2 is larger than the clamp control signal Vclamp, the selection module 6 selects to generate the clamp control signal Vclamp according to the main loop error signal Verr 3; when the first comparison signal Vcomp1 indicates that the first clamping error signal Verr1 is greater than or equal to the clamping control signal Vclamp, the selection module 6 selects to generate the clamping control signal Vclamp according to the first clamping error signal Verr 1; when the second comparison signal Vcomp2 indicates that the second clamp error signal Verr2 is less than or equal to the clamp control signal Vclamp, the selection module 6 selects to generate the clamp control signal Vclamp according to the second clamp error signal Verr 2.
In another embodiment, the first clamp set signal Vset1 sets the lower clamp value of the clamp feedback signal Vfb2, and the second clamp set signal Vset2 sets the upper clamp value of the clamp feedback signal Vfb 2. When the clamp feedback signal Vfb2 falls and approaches the first clamp set signal Vset1, the clamp control signal Vclamp follows the first clamp error signal Verr1, so that the clamp control signal Vclamp is controlled only by the first clamp error signal Verr 1; when the clamp feedback signal Vfb2 rises and approaches the second clamp set signal Vset2, the clamp control signal Vclamp follows the second clamp error signal Verr2, so that the clamp control signal Vclamp is controlled only by the second clamp error signal Verr 2; when the clamp feedback signal Vfb2 is between the first clamp set signal Vset1 and the second clamp set signal Vset2, the clamp control signal Vclamp is unaffected by the first clamp error signal Verr1 and the second clamp error signal Verr2, and is controlled only by the main loop error signal Verr 3.
When the first comparison signal Vcomp1 indicates that the first clamp error signal Verr1 is greater than the clamp control signal Vclamp and the second comparison signal Vcomp2 indicates that the second clamp error signal Verr2 is less than the clamp control signal Vclamp, the selection module 6 selects to generate the clamp control signal Vclamp according to the main loop error signal Verr 3; when the first comparison signal Vcomp1 represents that the first clamping error signal Verr1 is less than or equal to the clamping control signal Vclamp, the selection module 6 selects to generate the clamping control signal Vclamp according to the first clamping error signal Verr 1; when the second comparison signal Vcomp2 indicates that the second clamp error signal Verr2 is greater than or equal to the clamp control signal Vclamp, the selection module 6 selects to generate the clamp control signal Vclamp according to the second clamp error signal Verr 2.
The clamp circuit 10 of the present embodiment operates in two cases: one is to limit the output current Iout of the power supply circuit when a constant output voltage Vout is applied to the load (i.e., constant voltage current limiting control, where the output voltage Vout control loop is the main loop), and the other is to limit the output voltage Vout of the power supply circuit when a constant output current Iout is applied to the load (i.e., constant current voltage limiting control, where the output current Iout control loop is the main loop). The clamp circuit 10 is mainly used for monitoring the load change, feeding back the load change to the main loop in time, and adjusting an output signal (an output voltage Vout or an output current Iout) so that the output signal is not out of control. For example, when a constant output voltage Vout is applied to a load, if the load is short-circuited, the clamp circuit feeds back short-circuit information to the main loop to reduce the output voltage Vout of the main loop to 0v, so that a large current is not generated in the circuit, and the load is prevented from being burned by a large current.
In the clamp circuit of the embodiment, the working modes of the selection module and the comparison module ensure that only one error signal of the clamp error signal and the main loop error signal Verr3 input into the selection module at any time forms a control loop, so that no interference exists between the clamp circuit and the main loop, and certain precision can be ensured. In addition, the clamp circuit of the embodiment can complete the switching from the main loop to the clamp circuit before the clamp feedback signal Vfb2 reaches the limit value, and the occurrence of short over-limit of the output voltage Vout/current in the output regulation process can be effectively reduced.
Fig. 2 shows a schematic diagram of a power supply circuit according to a second embodiment of the present invention. In the present embodiment, the clamping circuit 10 can be applied to a power supply circuit that applies a constant output voltage Vout to a load 12, and has both a source measurement function and a clamping function for an output current Iout.
As shown in fig. 2, the power supply circuit of the present embodiment includes a clamp circuit 10, a power amplifier circuit 11, a current measuring circuit 13, a voltage measuring circuit 14, a selection circuit 15, and an integration circuit 16.
The clamp circuit 10 is connected to the selection circuit 15, and the clamp circuit 10 is configured to generate a clamp control signal Vclamp according to the main loop feedback signal Vfb1, the clamp feedback signal Vfb2, the main loop setting signal Vset3, and the first clamp setting signal Vset1 and/or the second clamp setting signal Vset 2. An integration circuit 16 is connected to the clamping circuit 10 for integrating the clamping control signal Vclamp to generate a clamping integration signal Vctrl. For example, the integration circuit 16 multiplies the clamp control signal Vclamp by a scaling coefficient to obtain the clamp integration signal Vctrl.
The power amplifier circuit 11 is connected to the integrator circuit 16 for amplifying the clamping integration signal Vctrl to a certain power, so as to apply a corresponding output voltage Vout to the load 12.
The current measurement circuit 13 is electrically connected to the power amplifier 11, and detects a value of an output current Iout flowing through the load 12 to obtain the current measurement signal Isen. The voltage measuring circuit 14 is electrically connected to the power amplifier 11, and detects a value of the output voltage Vout to obtain a voltage measuring signal Vsen. The load may be an integrated circuit, a transistor, or the like.
The selection circuit 15 is connected to the current measurement circuit 13 and the voltage measurement circuit 14, respectively, receives the current measurement signal Isen and the voltage measurement signal Vsen, and outputs a main loop feedback signal Vfb1 and a clamp feedback signal Vfb2 according to the current measurement signal Isen and the voltage measurement signal Vsen.
Illustratively, the working modes of the power supply circuit comprise a constant voltage current limiting mode and a constant current voltage limiting mode. The selection circuit 15 sets the voltage measurement signal Vsen to the main loop feedback signal Vfb1 and sets the current measurement signal Isen to the clamp feedback signal Vfb2 in the constant voltage current limiting mode; and setting the current measurement signal Isen to the main loop feedback signal Vfb1 and the voltage measurement signal Vsen to the clamp feedback signal Vfb2 in the constant current voltage limiting mode.
The power amplifier circuit 11 limits the output current Iout flowing through the load 12 to a value between current values corresponding to the first clamp setting signal Vset1 and the second clamp setting signal Vset2 according to the clamp integration signal Vctrl.
In conclusion, in the power supply circuit and the clamping circuit thereof provided by the embodiment of the present invention, the working mode of the selection module and the comparison module ensures that only one error signal forms the control loop in the clamping error signal and the main loop error signal of the input selection module at any time, so that there is no interference between the clamping circuit and the main loop, and the accuracy and stability of the circuit can be improved. In addition, the clamp circuit of the embodiment can complete the switching from the main loop to the clamp circuit before the clamp feedback signal reaches the limit value, and the occurrence of the situation that the output voltage is temporarily over-limited in the output regulation process can be effectively reduced. Further, the utility model discloses a clamp circuit can be realized through analog circuit hardware, and circuit structure is simple, and the cost is lower.
It should be noted that the words "during", "when" and "when … …" used herein in relation to the operation of the circuit are not strict terms indicating an action that occurs immediately at the start of a start action, but rather there may be some small but reasonable delay or delays, such as various transmission delays, between it and the reaction action (action) initiated by the start action. The words "about" or "substantially" are used herein to mean that the value of an element (element) has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there is always a slight deviation that makes it difficult for the value or position to be exactly the stated value. It has been well established in the art that a deviation of at least ten percent (10%) for a semiconductor doping concentration of at least twenty percent (20%) is a reasonable deviation from the exact ideal target described. When used in conjunction with a signal state, the actual voltage value or logic state (e.g., "1" or "0") of the signal depends on whether positive or negative logic is used.
Moreover, it is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.
Claims (20)
1. A clamp circuit for a power supply circuit, comprising:
the first comparison module receives a first clamping setting signal and a clamping feedback signal and generates a first clamping error signal according to the first clamping setting signal and the clamping feedback signal;
the second comparison module is connected with the first comparison module and used for receiving the first clamping error signal, and the second comparison module compares the first clamping error signal with a clamping control signal to generate a first comparison signal;
and the selection module is connected with the second comparison module and generates the clamping control signal according to one of the first comparison signal and the main loop error signal, and the clamping control signal limits the clamping feedback signal within a preset range.
2. The clamping circuit of claim 1, further comprising:
and the third comparison module receives a main loop setting signal and a main loop feedback signal and generates a main loop error signal according to the main loop setting signal and the main loop feedback signal.
3. The clamping circuit of claim 1, wherein said first clamping set signal sets an upper clamping value of said clamping feedback signal, and wherein said selection module selects said main loop error signal as said clamping control signal if said first comparison signal indicates that said first clamping error signal is less than said clamping control signal, and selects said first clamping error signal as said clamping control signal if said first comparison signal indicates that said first clamping error signal is equal to or greater than said clamping control signal.
4. The clamping circuit of claim 1, wherein said first clamping set signal sets a lower clamping value of said clamping feedback signal, and wherein said selection module selects said main loop error signal as said clamping control signal if said first comparison signal indicates that said first clamping error signal is greater than said clamping control signal, and selects said first clamping error signal as said clamping control signal if said first comparison signal indicates that said first clamping error signal is equal to or less than said clamping control signal.
5. The clamping circuit of claim 1, further comprising:
the fourth comparison module receives a second clamping setting signal and the clamping feedback signal and generates a second clamping error signal according to the second clamping setting signal and the clamping feedback signal; and
a fifth comparing module connected to the fourth comparing module and the selecting module, the fifth comparing module comparing the second clamping error signal with the clamping control signal to generate a second comparing signal, and providing the second comparing signal to the selecting module,
wherein the selection module generates the clamp control signal based on one of the first comparison signal, the second comparison signal, and the main loop error signal.
6. The clamp circuit of claim 5, wherein the first clamp setting signal sets an upper clamp value of the clamp feedback signal, wherein the second clamp setting signal sets a lower clamp value of the clamp feedback signal, and wherein the selection module selects the first clamp error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is equal to or greater than the clamp control signal, and selects the second clamp error signal as the clamp control signal if the second comparison signal indicates that the second clamp error signal is equal to or less than the clamp control signal.
7. The clamp circuit of claim 5, wherein the first clamp set signal sets a lower clamp value of the clamp feedback signal, wherein the second clamp set signal sets an upper clamp value of the clamp feedback signal, and wherein the selection module selects the first clamp error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is equal to or less than the clamp control signal, and selects the second clamp error signal as the clamp control signal if the second comparison signal indicates that the second clamp error signal is equal to or greater than the clamp control signal.
8. The clamping circuit of claim 6, wherein the selection module selects the main loop error signal as the clamping control signal if the first comparison signal characterizes the first clamping error signal as being less than the clamping control signal and the second comparison signal characterizes the second clamping error signal as being greater than the clamping control signal.
9. The clamping circuit of claim 7, wherein the selection module is configured to select the main loop error signal as the clamping control signal if the second comparison signal indicates that the second clamping error signal is less than the clamping control signal and the first comparison signal indicates that the first clamping error signal is greater than the clamping control signal.
10. A power supply circuit, comprising:
the selection circuit generates a main loop feedback signal and a clamping feedback signal according to the current measurement signal and the voltage measurement signal;
the clamping circuit is connected with the selection circuit and used for receiving the main loop feedback signal and the clamping feedback signal, and the clamping circuit generates a clamping control signal according to the main loop feedback signal, the clamping feedback signal, a main loop setting signal and a first clamping setting signal and/or a second clamping setting signal;
the power amplification circuit is connected with the clamping circuit, receives the clamping control signal and performs power amplification on the clamping control signal so as to provide an output signal for a load;
a measuring circuit for detecting the output voltage and the output current of the power supply circuit to obtain a voltage measuring signal and a current measuring signal respectively,
wherein the clamp circuit comprises:
the first comparison module receives a first clamping setting signal and a clamping feedback signal and generates a first clamping error signal according to the first clamping setting signal and the clamping feedback signal;
the second comparison module is connected with the first comparison module and used for receiving the first clamping error signal, and the second comparison module compares the first clamping error signal with a clamping control signal to generate a first comparison signal;
and the selection module is connected with the second comparison module and generates the clamping control signal according to one of the first comparison signal and the main loop error signal, and the clamping control signal limits the clamping feedback signal within a preset range.
11. The power supply circuit of claim 10, wherein the clamp circuit further comprises:
and the third comparison module receives a main loop setting signal and a main loop feedback signal and generates a main loop error signal according to the main loop setting signal and the main loop feedback signal.
12. The power supply circuit of claim 10, wherein the first clamp set signal sets an upper clamp value of the clamp feedback signal, and wherein the selection module selects the main loop error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is less than the clamp control signal, and selects the first clamp error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is equal to or greater than the clamp control signal.
13. The power supply circuit of claim 10, wherein the first clamp set signal sets a lower clamp value of the clamp feedback signal, and wherein the selection module selects the main loop error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is greater than the clamp control signal, and selects the first clamp error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is less than or equal to the clamp control signal.
14. The power supply circuit of claim 10, wherein the clamp circuit further comprises:
the fourth comparison module receives a second clamping setting signal and the clamping feedback signal and generates a second clamping error signal according to the second clamping setting signal and the clamping feedback signal; and
a fifth comparing module connected to the fourth comparing module and the selecting module, the fifth comparing module comparing the second clamping error signal with the clamping control signal to generate a second comparing signal, and providing the second comparing signal to the selecting module,
wherein the selection module generates the clamp control signal based on one of the first comparison signal, the second comparison signal, and the main loop error signal.
15. The power supply circuit of claim 14, wherein the first clamp setting signal sets an upper clamp value of the clamp feedback signal, wherein the second clamp setting signal sets a lower clamp value of the clamp feedback signal, and wherein the selection module selects the first clamp error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is equal to or greater than the clamp control signal, and selects the second clamp error signal as the clamp control signal if the second comparison signal indicates that the second clamp error signal is equal to or less than the clamp control signal.
16. The power supply circuit of claim 14, wherein the first clamp setting signal sets a lower clamp value of the clamp feedback signal, wherein the second setting control signal sets an upper clamp value of the clamp feedback signal, and wherein the selection module selects the first clamp error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is equal to or less than the clamp control signal, and selects the second clamp error signal as the clamp control signal if the second comparison signal indicates that the second clamp error signal is equal to or greater than the clamp control signal.
17. The power supply circuit of claim 15, wherein the selection module selects the main loop error signal as the clamp control signal if the first comparison signal indicates that the first clamp error signal is less than the clamp control signal and the second comparison signal indicates that the second clamp error signal is greater than the clamp control signal.
18. The power supply circuit of claim 16, wherein the selection module selects the main loop error signal as the clamp control signal if the second comparison signal indicates that the second clamp error signal is less than the clamp control signal and the first comparison signal indicates that the first clamp error signal is greater than the clamp control signal.
19. The power supply circuit of claim 10, wherein the measurement circuit comprises:
a current measurement circuit connected to the power amplifier to generate the current measurement signal according to an output current flowing through the load;
and the voltage measuring circuit is connected with the power amplifier so as to generate the voltage measuring signal according to the output voltage of the power amplifier.
20. The power supply circuit of claim 10, further comprising:
and the integrating circuit is connected with the clamping circuit and the power amplifying circuit, integrates the clamping control signal to obtain a clamping integral signal, and provides the clamping integral signal to the power amplifying circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022193467.6U CN213661446U (en) | 2020-09-29 | 2020-09-29 | Power supply circuit and clamping circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022193467.6U CN213661446U (en) | 2020-09-29 | 2020-09-29 | Power supply circuit and clamping circuit thereof |
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| CN213661446U true CN213661446U (en) | 2021-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115051658A (en) * | 2022-08-17 | 2022-09-13 | 苏州赛莫测控科技有限公司 | Signal amplification circuit with switch mode clamp protection and clamp protection method |
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- 2020-09-29 CN CN202022193467.6U patent/CN213661446U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115051658A (en) * | 2022-08-17 | 2022-09-13 | 苏州赛莫测控科技有限公司 | Signal amplification circuit with switch mode clamp protection and clamp protection method |
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