CN211508907U - Control circuit of switching power supply conversion device - Google Patents
Control circuit of switching power supply conversion device Download PDFInfo
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- CN211508907U CN211508907U CN201922427888.8U CN201922427888U CN211508907U CN 211508907 U CN211508907 U CN 211508907U CN 201922427888 U CN201922427888 U CN 201922427888U CN 211508907 U CN211508907 U CN 211508907U
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Abstract
The utility model discloses a switching power supply conversion equipment control circuit is applied to the switching power supply including sampling unit, logic control unit, the logic that includes amplifier, first comparison unit judges the circuit, the amplifier input is connected with sampling unit, the output respectively with logic control unit and first comparison unit are connected for carry out the comparison with the output voltage of sensing and predetermine first voltage, and output comparison result to logic control unit or first comparison unit; the input end of the first comparison unit is connected with the output end of the amplifier, the output end of the first comparison unit is connected with the logic control unit and used for comparing a comparison result output by the amplifier with a preset second voltage and outputting a second signal of the comparison result to the logic control unit so that the switching power supply works in a long-pass mode, the output voltage of the switching power supply is not affected by the minimum turn-off time and the maximum duty ratio, and the extension of the output voltage range is realized.
Description
Technical Field
The present disclosure relates to power supply field, and more particularly, to a control circuit for a switching power supply converter.
Background
A Switching Mode Power Supply (Switching Mode Power Supply) is a high-frequency Power conversion device, which functions to convert a level voltage into a voltage or current required by a user terminal through different types of architectures, and is widely applied to the fields of industrial automation control, military equipment, communication equipment, Power equipment, digital products, instruments and the like. With the expansion of the application field, the switching power supply has higher requirements on the output voltage range, namely, has a wide output voltage range.
In the traditional step-down DC-DC switching power supply design, in order to ensure the stability and reliability of power supply output under different application conditions, the limitations of minimum on time, minimum off time, maximum duty ratio and the like are often required to be added in an internal control circuit in advance, but the design enables the output voltage width of the switching power supply to be limited. Therefore, a stable, reliable switching power supply with an expandable voltage range is needed to meet the load requirements of various voltage classes.
SUMMERY OF THE UTILITY MODEL
The utility model provides a control circuit of a switching power supply conversion device, which is used for solving the technical problem that the output voltage width of the switching power supply is limited in the prior art, and comprises an amplifier and a logic judgment circuit of a first comparison unit,
the input end of the amplifier is connected with the sampling unit, the output end of the amplifier is respectively connected with the logic control unit and the first comparison unit, and the amplifier is used for comparing the sensed output voltage with a preset first voltage and outputting a comparison result to the logic control unit or the first comparison unit;
the input end of the first comparison unit is connected with the output end of the amplifier, the output end of the first comparison unit is connected with the logic control unit, and the first comparison unit is used for comparing a comparison result output by the amplifier with a preset second voltage and outputting a second signal of the comparison result to the logic control unit so that the switching power supply works in a long-pass mode.
Preferably, the power supply device also comprises a control mode power supply circuit,
and the control mode power supply circuit is used for executing the control signal output by the logic control unit to enable the switching power supply to work in a long-pass mode and/or a switching mode.
Preferably, the device also comprises a second comparison unit,
the input end of the second comparison unit is connected with the sampling unit, the output end of the second comparison unit is connected with the logic control unit, and the second comparison unit is used for comparing the sensed output voltage with the third voltage and outputting a fourth signal of a comparison result to the logic control unit so that the switching power supply works in a long-pass mode.
Preferably, the first and second liquid crystal materials are,
and when the logic unit receives the fourth signal output by the second comparison unit, the logic unit preferentially executes the fourth signal to enable the switching power supply to work in a long-pass mode.
Preferably, the first and second liquid crystal materials are,
when the first signal is larger than a preset second voltage, the first comparator outputs no signal, and the switching power supply works in a switching mode.
Preferably, the first and second liquid crystal materials are,
when the fourth signal is greater than a preset third voltage, the second comparing unit outputs no signal, and the switching power supply works in a switching mode.
Compared with the prior art, the utility model discloses possess following beneficial effect:
the utility model discloses a switching power supply conversion equipment control circuit is applied to the switching power supply including sampling unit, logic control unit, the logic that includes amplifier, first comparison unit judges the circuit, the amplifier input is connected with sampling unit, the output respectively with logic control unit and first comparison unit are connected for carry out the comparison with the output voltage of sensing and predetermine first voltage, and output comparison result to logic control unit or first comparison unit; the input end of the first comparison unit is connected with the output end of the amplifier, the output end of the first comparison unit is connected with the logic control unit and used for comparing a comparison result output by the amplifier with a preset second voltage and outputting a second signal of the comparison result to the logic control unit so that the switching power supply works in a long-pass mode, the output voltage of the switching power supply is not affected by the minimum turn-off time and the maximum duty ratio, and the extension of an output voltage range, namely the wide output voltage, is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a control circuit of a switching power converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control circuit of a switching power converter according to another embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a method for controlling a switching power converter according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a control method for a switching power supply converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As described in the background art, in the conventional buck DC-DC switching power supply design in the prior art, in order to ensure stability and reliability of power output under different application conditions, it is often necessary to add limitations such as minimum on time, minimum off time, maximum duty ratio, etc. in advance in an internal control circuit, but this design makes the output voltage width of the switching power supply limited.
In order to solve the above problem, an embodiment of the present application provides a control circuit for a switching power converter, which includes an amplifier, a logic determining circuit of a first comparing unit,
the input end of the amplifying unit is connected with the sampling unit, the output end of the amplifying unit is respectively connected with the logic control unit and the first comparing unit, and the amplifying unit is used for comparing the sensed output voltage with a preset first voltage and outputting a comparison result to the logic control unit or the first comparing unit.
The input end of the first comparison unit is connected with the output end of the amplification unit, the output end of the first comparison unit is connected with the logic control unit, and the first comparison unit is used for comparing a comparison result output by the amplification unit with a preset second voltage and outputting a second signal of the comparison result to the logic control unit so that the switching power supply works in a long-pass mode.
In the preferred embodiment of the present application, a control mode power supply circuit is further included.
And the control mode power supply circuit is used for executing the control signal output by the logic control unit to enable the switching power supply to work in a long-pass mode and/or a switching mode.
In a preferred embodiment of the present application, a second comparing unit is further included.
The input end of the second comparison unit is connected with the sampling unit, the output end of the second comparison unit is connected with the logic control unit, and the second comparison unit is used for comparing the sensed output voltage with the third voltage and outputting a fourth signal of a comparison result to the logic control unit so that the switching power supply works in a long-pass mode.
In a preferred embodiment of the present application, after the logic unit receives the fourth signal output by the second comparing unit, the logic unit preferentially executes the fourth signal, so that the switching power supply operates in the long-pass mode.
In a preferred embodiment of the present application, when the first signal is greater than a preset second voltage, the first comparator outputs no signal, and the switching power supply operates in a switching mode;
in a preferred embodiment of the present application, when the fourth signal is greater than a preset third voltage, the second comparing unit outputs no signal, and the switching power supply operates in a switching mode.
In order to further explain the technical idea of the utility model, combine specific application scene now, it is right to the technical scheme of the utility model explain.
With the development of electronic information technology, switching power supply products are widely applied to industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instruments, medical equipment, household electrical equipment, digital equipment and the like, and the problem of wide output voltage is more and more prominent in the face of continuous expansion of the application field.
In the traditional step-down DC-DC design, in order to ensure the stability and reliability of power output under different application conditions, the limitations of minimum on time, minimum off time, maximum duty ratio and the like are often required to be added in an internal control circuit in advance, but the design enables the output voltage width of the switching power supply to be limited.
The technical scheme of the present disclosure further expands the range of the output voltage Vout, and simultaneously improves the stability and reliability of the switching power supply, and referring to fig. 1, the switching power supply conversion apparatus includes a control mode power supply circuit 3, a logic control unit 2, and a logic judgment circuit 1, where the logic judgment circuit 2 senses the output voltage Vout through a sampling unit, compares the sensed output voltage Vout with a preset voltage, and outputs a signal to the logic control unit 2 according to the comparison result; the logic control unit 2 drives the first switch M1 and/or the second switch M2 in the control mode power supply circuit 3 to be switched on or off according to the received signal, so as to realize the switching between the power supply circuit switch mode and the long-pass mode, and ensure the continuous, stable and reliable power supply of the switch power supply.
The logic determining circuit 1, referring to fig. 1, includes an amplifier 11 and a first comparing unit 12, wherein an input end of the amplifier 11 is connected to the sampling unit, and an output end of the amplifier 11 is respectively connected to the logic control unit 2 and the first comparing unit 12, and is configured to compare the sensed output voltage Vout with a preset first voltage Vth1, and output a comparison result to the logic control unit 2 or the first comparing unit 12.
The input end of the first comparing unit 12 is connected to the output end of the amplifier 11, and the output end of the first comparing unit is connected to the logic control unit 2, and is configured to compare the comparison result of the amplifier output 11 with the preset second voltage Vth2, and output a comparison result second signal Vcom2 to the logic control unit 2, so that the switching power supply operates in the long-pass mode.
The purpose of the design of the switching power supply circuit is to achieve a stable output voltage Vout in two control modes, namely a long-pass control mode and a switching control mode, but the normal use of the switching power supply is obviously seriously affected by mis-switching and mis-operation, and obviously, the first comparison unit designed by the disclosure effectively solves the problems.
Specifically, during the operation of the switching power supply, the load or the power supply is affected by the temperature and the disturbance factor, and the output voltage Vout or the voltage required by the load may temporarily increase or decrease, which may result in an increase of the difference between Vout and Vth1, i.e. the comparator will output the first signal. If there is no first comparing unit, the logic control unit 2 outputs a long-pass mode signal to the control mode power supply circuit 3 after receiving the first signal, so as to start the long-pass mode, and thus the switching times of the switching power supply are increased, thereby increasing the loss of the power supply and reducing the stability and reliability of the power supply. The present disclosure connects the amplifier 11 with the first comparing unit 12, compares the first signal Vcom1 output by the amplifier 11 with the preset second voltage Vth2 again, and outputs the second signal Vcom2 to the logic control unit 2 when the first signal Vcom1 is less than the preset second voltage Vth2, thereby turning on the long-pass mode. Therefore, the switching power supply stability and reliability are improved.
The control mode power supply circuit 3 comprises a first switch M1, a second switch M2 and an inductor L, and the long-pass mode power supply circuit directly outputs a voltage Vout to a power source Vin through the switch M1 and the inductor L; in the switch mode power supply circuit, a power supply Vin outputs a voltage Vout through a switch M1 or a switch M2 and an inductor L.
Specifically, the amplifier 11 senses the output voltage Vout through the sampling unit, compares the sensed output voltage Vout with a preset first voltage Vth1, generates a first signal Vcom1 and outputs the first comparison unit 12 when the output voltage Vout is smaller than the preset first voltage Vth1, the first comparison unit 12 compares the received first signal Vcom1 with a preset second voltage Vth2, and generates a second signal Vcom2 to the logic control unit 2 when the first signal Vcom1 is smaller than the preset second voltage Vth2, and the logic control unit 2 turns on the first switch M1 in the control mode power supply circuit 3 and turns off the second switch M2, so that the switching power supply enters the long-pass mode.
When the output voltage Vout is greater than the preset first voltage Vth1 or the preset third voltage Vth3, the switching power supply operates in a switching mode, i.e. the circuit operates in a state where the switches M1 and M2 are alternately turned on/off, the on/off of the switches M1 and M2 depends on the third signal Vcom3, and the third signal Vcom3 is related to the output voltage Vout, the preset voltage Vth1 and the gain Av of the amplifying unit, i.e. the following formula is satisfied: vcom3 ═ (Vth1-Vout) XAv. It can be understood that Vth1 is a preset first voltage, the gain Av is inherent to the amplifying unit and is not changed by the change of each parameter in the circuit, and the output voltage Vout decreases as the output voltage decreases. Based on the above equation and the inverting amplifier characteristics, it can be deduced that Vcom3 will increase as Vout decreases. When the third signal Vcom3 increases, it will output the third signal Vcom3 to the logic control unit 3, turn on the switch M1, turn off the switch M2; when the Vout is large, the switch M2 is turned on, the switch M1 is turned off, and the first switch M1 and the second switch M2 are alternately turned on, so that the stability and reliability of the output voltage are ensured.
The above-described embodiment obviously helps to solve the problem of wide output voltage, because the above-described embodiment designs a long-pass control mode based on a switching circuit in addition to a switching control mode, in which the switch M1 is always in a conducting state, the output voltage Vout is not affected by the maximum duty ratio and the switching frequency, Vout-Vin-Vres (where Vres represents the voltage drop in the components in the power supply circuit), and when the internal resistance in the circuit is small enough or can be neglected, Vin-Vout is implemented, thereby realizing the switching power supply wide output voltage.
The logic determining circuit 1 further includes a second comparing unit 13, as shown in fig. 2, when the output voltage ripple of the switching power supply is large, the sensitivity of the switching power supply is relatively low, that is, when the sensed output voltage Vout is smaller than the preset third voltage Vth3, it indicates that the output voltage has not satisfied the requirement of the load, so that it can be determined whether the switching power supply is in the long-pass mode according to the comparison result output by the second comparing unit 13. Therefore, the input end of the second comparing unit 13 is connected to the sampling unit, the output end is connected to the logic control unit 2, and when the sensed output voltage Vout is less than the preset third voltage Vth3, the fourth signal Vcom4 is output to the logic control unit 2, so that the switching power supply operates in the long-pass mode.
For the logic decision circuit 1 including the second comparing unit 13, when the sensed output voltage Vout is smaller than the preset third voltage Vth3 and the generated fourth signal is output to the logic control unit 2, it needs to set a priority level in the logic control unit 2, and the fourth signal is preferentially executed to switch the control mode power supply circuit 3 to the long pass mode.
Specifically, the second comparing unit 13 senses the output voltage Vout through the sampling unit, compares the sensed output voltage Vout with a preset third voltage Vth3, generates a fourth signal Vcom4 and outputs the fourth signal Vcom to the logic control unit 2 when the output voltage Vout is smaller than the preset third voltage Vth3, and the logic control unit 2 turns on the first switch M1 and turns off the second switch M2 in the control mode power supply circuit 3, so that the switching power supply enters the long-pass mode.
When the sensed output voltage Vout is greater than or equal to the preset third voltage Vth3, the second comparing unit 13 outputs the generated fifth signal Vcom5 to the logic control unit 2, so that the first switch M1 and the second switch M2 in the control mode power supply circuit 3 are alternately turned on or off, and the switching power supply enters the switching mode.
By applying the technical scheme, the logic control unit is provided with signals based on the logic judgment circuit, and the working stability and reliability of the logic control unit are ensured under the condition of expanding the output voltage range.
As shown in fig. 4, the present application also provides a method for controlling a switching power supply of an envelope tracking power amplifier, the method comprising the following steps:
step S401, when the sensed output voltage is smaller than a preset first voltage, generating a first signal, amplifying the first signal, and outputting the amplified first signal to the first comparing unit, where the output voltage is a voltage provided by the switching power supply to a load.
Specifically, as shown in fig. 3, the output voltage Vout generated by sensing is compared with a preset first voltage Vth1, when Vout is smaller than Vth1, a first signal Vcom1 is generated, and the first signal Vcom1 is amplified and then output to a first comparison unit.
Accordingly, in a specific application scenario of the present application, as shown in fig. 1, the output voltage Vout is sensed by the comparator during the process of passing through the sampling unit, and when the output voltage Vout sensed by the comparator is less than the preset first voltage Vth1, a first signal is generated and amplified and outputted to the first comparing unit.
In order to realize a wide output voltage of the switching power supply, in a preferred embodiment of the present application, when the sensed output voltage is equal to or greater than a preset first voltage or the switching power supply is in a normal operating state, a third signal for operating the switching power supply in a switching mode is generated.
Specifically, as shown in fig. 3, when the output voltage Vout is greater than or equal to Vth or the switching power supply is in a normal operating state, a third signal Vcom3 is generated, so that the switching power supply is in a switching mode.
Correspondingly, as shown in fig. 1, the comparator compares the sensed output voltage Vout with the preset first voltage Vth1 in the process that the output voltage Vout passes through the sampling unit, and when the sensed output voltage is greater than or equal to the preset first voltage Vth1 or the switching power supply is in a normal operating state, the first comparing unit outputs a third signal to the logic control unit to enable the control mode power supply circuit to operate in a switching mode, that is, the first switch M1 and the second switch M2 are alternately turned on/off.
Step S402, when the first signal is smaller than a preset second voltage, generating a second signal for enabling the switching power supply to be in a long-pass mode.
Specifically, as shown in fig. 3, the first signal Vcom1 is compared with a preset second voltage Vth2, and when the first signal is smaller than the second voltage, a second signal Vcom2 is generated to make the switching power supply in a long-pass mode.
Correspondingly, in the circuit described with reference to fig. 1, the first comparing unit compares the received first signal Vcom1 with the preset second voltage Vth2, and when the first signal Vcom1 is smaller than the preset second voltage Vth2, the first comparing unit outputs the second signal Vcom2 to the logic control unit, so that the first switch M1 in the control mode power supply circuit is turned on, the second switch M2 is turned off, and the switching power supply enters the long-pass mode.
In order to further improve the reliability and stability of the switching power supply, in the preferred embodiment of the present application, when the output voltage ripple of the switching power supply is large, when the sensed output voltage is less than the preset third voltage, the fourth signal that the switching power supply is in the long-pass mode is generated.
Specifically, when the output voltage ripple of the switching power supply is large, the output voltage Vout is compared with the preset third voltage Vth3, and when the output voltage is smaller than the third voltage, a fourth signal Vcom4 is generated, so that the switching power supply is in a long-pass mode.
Accordingly, in a specific application scenario of the present application, referring to fig. 2, the output voltage Vout is obtained by sensing by the second comparing unit during the process of passing through the sampling unit. When the output voltage Vout sensed by the second comparison voltage is less than the preset third voltage Vth3, a fourth signal is generated and output to the logic control unit to turn on the first switch M1 and turn off the second switch M2 in the control mode power supply circuit, and the switching power supply is in the long-pass mode.
In order to improve the stability and reliability of the switching power supply, when the sensed output voltage is greater than or equal to a preset third voltage or the switching power supply is in a normal operating state, a fifth signal for operating the switching power supply in a switching mode is generated.
Specifically, referring to fig. 2, in the process of passing the output voltage Vout through the sampling unit, the second comparing unit compares the sensed output voltage Vout with a preset third voltage Vth3, and when the sensed output voltage is greater than or equal to the preset third voltage Vth3 or the switching power supply is in a normal operating state, the second comparing unit outputs a fifth signal to the logic control unit to enable the control mode power supply circuit to operate in a switching mode, that is, the first switch M1 and the second switch M2 are alternately turned on/off.
By applying the technical scheme, in the switching power supply, the switching power supply enters a long-pass mode through the first signal generated by comparing the output voltage with the preset first voltage, the output voltage range of the switching power supply is expanded, when the first signal is compared with the preset second voltage, the switching power supply enters the long-pass mode according to the comparison result, the output voltage range is expanded, and meanwhile the reliability and the stability of the switching power supply are improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. A switching power supply conversion device control circuit is applied to a switching power supply comprising a sampling unit and a logic control unit and is characterized by comprising an amplifier and a logic judgment circuit of a first comparison unit,
the input end of the amplifier is connected with the sampling unit, the output end of the amplifier is respectively connected with the logic control unit and the first comparison unit, and the amplifier is used for comparing the sensed output voltage with a preset first voltage and outputting a first signal of a comparison result to the logic control unit or the first comparison unit;
the input end of the first comparison unit is connected with the output end of the amplifier, the output end of the first comparison unit is connected with the logic control unit, and the first comparison unit is used for comparing a comparison result output by the amplifier with a preset second voltage and outputting a second signal of the comparison result to the logic control unit so that the switching power supply works in a long-pass mode.
2. The switching power converter control circuit according to claim 1, further comprising a control mode power supply circuit,
and the control mode power supply circuit is used for executing the control signal output by the logic control unit to enable the switching power supply to work in a long-pass mode and/or a switching mode.
3. The switching power converter control circuit according to claim 1, further comprising a second comparing unit,
the input end of the second comparison unit is connected with the sampling unit, the output end of the second comparison unit is connected with the logic control unit, and the second comparison unit is used for comparing the sensed output voltage with the third voltage and outputting a fourth signal of a comparison result to the logic control unit so that the switching power supply works in a long-pass mode.
4. The switching power converter control circuit according to claim 3,
and when the logic control unit receives the fourth signal output by the second comparison unit, the logic control unit preferentially executes the fourth signal to enable the switching power supply to work in a long-pass mode.
5. The switching power converter control circuit according to claim 1,
when the first signal is larger than a preset second voltage, the first comparator outputs no signal, and the switching power supply works in a switching mode.
6. The switching power converter control circuit according to claim 4,
when the fourth signal is greater than a preset third voltage, the second comparing unit outputs no signal, and the switching power supply works in a switching mode.
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| CN201922427888.8U CN211508907U (en) | 2019-12-27 | 2019-12-27 | Control circuit of switching power supply conversion device |
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| CN201922427888.8U CN211508907U (en) | 2019-12-27 | 2019-12-27 | Control circuit of switching power supply conversion device |
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