CN107562111B - DC stabilized power supply and voltage regulation method - Google Patents
DC stabilized power supply and voltage regulation method Download PDFInfo
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- CN107562111B CN107562111B CN201710935040.9A CN201710935040A CN107562111B CN 107562111 B CN107562111 B CN 107562111B CN 201710935040 A CN201710935040 A CN 201710935040A CN 107562111 B CN107562111 B CN 107562111B
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Abstract
The invention relates to a direct current stabilized voltage power supply and a voltage regulation method, comprising the following steps: the voltage regulating circuit comprises an error amplifier, a regulating element, a feedback resistance network module and a voltage gear regulating device, wherein the feedback resistance network module comprises a first resistor and a second resistor, a reference voltage is connected to a positive input end, and an output end of the error amplifier is connected with a first end of the regulating element; the negative input end is respectively connected with the first end of the first resistor and the first end of the second resistor; the positive power supply end and the second end of the adjusting element are respectively used for accessing an external power supply; the third end of the adjusting element is connected with the second end of the first resistor, and the third end of the adjusting element is connected with the voltage output end; the first end of the first resistor is connected with the first end of the second resistor, and the third end of the first resistor is connected with the voltage gear adjusting device; the second end of the second resistor is grounded; the voltage gear adjusting device controls and adjusts the resistance value of the first resistor and adjusts the output voltage of the voltage output end. The direct current stabilized voltage power supply is simple in structure and simple in output voltage regulation.
Description
Technical Field
The invention relates to the technical field of integrated power supplies, in particular to a direct-current stabilized power supply and a voltage regulation method.
Background
With the rapid development of electronic technology, the performance requirements of various electronic and electrical equipment on voltage stabilization are also correspondingly improved, and especially, a direct-current stabilized voltage supply is integrated inside some chips to improve stable voltage support inside the chips. For a dc regulated power supply integrated inside a chip, consideration is generally given to power supply rejection ratio, transient response, load regulation, noise, electrostatic current regulation, and the like. However, in some cases, the chip has low requirements on the load regulation rate of the dc stabilized power supply, but requires that the voltage of the dc stabilized power supply is adjustable.
At present, the adjustment of voltage is usually realized by integrating a large capacitor, an off-chip capacitor and multi-stage nested compensation; or so that multiple feedback circuits are employed to effect adjustment of the voltage. However, these methods have the problems of complicated circuit structure and high cost.
Disclosure of Invention
Therefore, it is necessary to provide a dc regulated power supply and a voltage regulation method, which solve the problems of complicated circuit and high cost of the existing dc regulated power supply.
A regulated dc power supply comprising: the voltage regulating circuit comprises an error amplifier, a regulating element, a feedback resistance network module and a voltage gear regulating device, wherein the feedback resistance network module comprises a first resistor and a second resistor, and the first resistor is a variable resistor;
the positive input end of the error amplifier is used for accessing a reference voltage, and the output end of the error amplifier is connected with the first end of the adjusting element; the negative input end of the error amplifier is respectively connected with the first end of the first resistor and the first end of the second resistor; the positive power supply end of the error amplifier and the second end of the adjusting element are respectively used for being connected with an external power supply;
the third end of the adjusting element is connected with the second end of the first resistor, and the third end of the adjusting element is a voltage output end;
the first end of the first resistor is connected with the first end of the second resistor, and the third end of the first resistor is connected with the voltage gear adjusting device; the second end of the second resistor is grounded;
the voltage gear adjusting device is used for outputting a control signal to control and adjust the resistance value of the first resistor.
The direct current stabilized voltage supply comprises an error amplifier, an adjusting element, a feedback resistance network module and a voltage gear adjusting device, wherein the feedback resistance network module comprises a first resistor and a second resistor, and the first resistor is a variable resistor; the positive input end of the error amplifier is used for being connected with a reference voltage, and the negative input end of the error amplifier is respectively connected with the first end of the first resistor and the first end of the second resistor; the positive power supply end of the error amplifier and the second end of the adjusting element are respectively used for accessing an external power supply; the second end of the adjusting element is connected with the second end of the first resistor, and the third end of the adjusting element is a voltage output end; the first end of the first resistor is connected with the first end of the second resistor, when the load current in the circuit changes, the feedback resistor network module is used for collecting the output voltage, the output voltage is fed back to the error amplifier and is amplified by the error amplifier and then is input to the first end of the adjusting element, and therefore the output voltage (namely the voltage of the voltage output end) of the voltage-stabilized power supply is adjusted by adjusting the voltage of the first end of the adjusting element. The third end of the first resistor of the direct current stabilized power supply is connected with a voltage gear adjusting device; the voltage gear adjusting device controls and adjusts the resistance value of the first resistor, so that the output voltage of the voltage-stabilized power supply can be adjusted. The direct current stabilized voltage power supply is simple in structure, and output voltage is very simple and convenient to adjust.
The voltage regulation method of the direct current stabilized power supply is characterized by comprising the following steps of:
detecting the current output voltage of the voltage output end, determining the current voltage gear value according to the current output voltage, and acquiring a target voltage gear value;
comparing the current voltage gear value to the target voltage gear value;
when the current voltage gear value is not equal to the target voltage gear value, gradually adjusting the current voltage gear value according to the target voltage gear value until the current voltage gear value is equal to the target voltage gear value, and outputting the control signal;
and adjusting the resistance value of the first resistor according to the control signal, so as to adjust the output voltage of the voltage output end.
The voltage regulation method of the direct-current regulated voltage adopts the direct-current regulated power supply, so that the output voltage of the direct-current regulated power supply can be conveniently regulated.
Drawings
FIG. 1 is a block diagram of a DC regulated power supply of the present invention in one embodiment;
FIG. 2 is a block diagram of a DC regulated power supply of the present invention in one embodiment;
FIG. 3 is a block diagram of a DC regulated power supply of the present invention in one embodiment;
FIG. 4 is a block diagram of a DC regulated power supply of the present invention in one embodiment;
FIG. 5 is a schematic flow chart of a voltage regulation method according to one embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the variation of the output voltage in the voltage regulation method according to the present invention;
FIG. 7 is a flow chart illustrating a voltage regulation method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments and the accompanying drawings. It is to be understood that the following examples are illustrative only and are not intended to limit the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that, for the convenience of description, only some but not all of the matters related to the present invention are shown in the drawings.
Fig. 1 is a schematic flow chart of an embodiment of a regulated dc power supply of the present invention, as shown in fig. 1, an error amplifier U1, a regulating element 10, a feedback resistor network module 20, and a voltage step adjustment device 30, wherein the feedback resistor network module 20 includes a first resistor R1 and a second resistor R2, and the first resistor R1 is a variable resistor; the positive input end of the error amplifier U1 is used for connecting a reference voltage VREFThe output end of the error amplifier U1 is connected with the first end of the adjusting element 10; the negative input end of the error amplifier U1 is respectively connected with the first end of the first resistor R1 and the first end of the second resistor R2; the forward power supply end of the error amplifier U1 and the second end of the regulating element 10 are respectively used for connecting an external power supply VDD(ii) a The third terminal of the adjusting device 10 is connected to the second terminal of the first resistor R1, and the third terminal of the adjusting device 10 is the voltage output terminal Vout. A first end of the first resistor R1 is connected with a first end of the second resistor R2, and a third end of the first resistor R1 is connected with the voltage step adjusting device 30; a second end of the second resistor R2 is grounded; the voltage step adjustment device 30 controls and adjusts the resistance value of the first resistor R1 to adjust the output voltage of the voltage output terminal.
The dc regulated power supply comprises an error amplifier U1, a regulating element 10, a feedback resistor network module 20 and a voltage step adjusting device 30, wherein the feedback resistor network module 20 comprises a first resistor R1 and a second resistor R2, and the first resistor R1 is a variable resistor; the positive input end of the error amplifier U1 is used for being connected with a reference voltage VREFThe negative input end of the error amplifier U1 is respectively connected with the first end of the first resistor R1 and the first end of the second resistor R2; the forward power supply terminal of the error amplifier U1 and the second terminal of the regulating element 30 are respectively used for connecting an external power supply VDD(ii) a The second terminal of the adjustment element 10 is connected to the second terminal of the first resistor R1, and the third terminal of the adjustment element 10The terminal is a voltage output terminal Vout; the first end of the first resistor R1 is connected to the first end of the second resistor R2, and when a load current in the circuit changes, the feedback resistor network module (i.e., the first resistor R1 and the second resistor R2) is used to collect an output voltage, Vout, and the output voltage is fed back to the error amplifier U1 (i.e., to the negative input terminal of the error amplifier U1), and amplified by the error amplifier U1 and input to the first end of the regulating element 10, so that the output voltage, Vout, of the regulated power supply (i.e., the voltage at the voltage output terminal) is regulated by regulating the voltage at the first end of the regulating element 10. The first resistor R1 is a variable resistor, and the third end (i.e., the resistor resistance adjusting end) of the first resistor R1 is connected to the voltage step adjusting device 30; the voltage step adjusting device 30 controls and adjusts the resistance of the first resistor R1, so that the output voltage Vout of the regulated power supply can be adjusted. The direct current stabilized voltage power supply is simple in structure, and output voltage is very simple and convenient to adjust.
In one embodiment, as shown in fig. 2, the voltage step adjustment device 30 includes a current voltage step storage device 31, a voltage step comparison circuit 32 and a voltage step adjustment circuit 33, which are connected in sequence, and the voltage step adjustment circuit 33 is connected to the third terminal of the first resistor. Wherein the present voltage gear storage means 31 is used for storing a present voltage gear value, which is determined according to the present output voltage of the voltage output terminal; the voltage gear comparison circuit 32 is used for comparing the current voltage gear value with the target voltage gear value; the voltage gear adjusting circuit 33 is used for adjusting the current voltage gear value output control signal according to the target voltage gear value. The voltage step adjustment circuit 33 outputs a control signal to adjust the resistance value of the first resistor.
Specifically, the voltage step adjustment device 30 includes a current voltage step storage device 31, a voltage step comparison circuit 32 and a voltage step adjustment circuit 33, wherein the current voltage step storage device 31, the voltage step comparison circuit 32 and the voltage step adjustment circuit 33 are sequentially connected, and the voltage step adjustment circuit 33 is connected to the third end of the first resistor. The current voltage step storage device 31 is used for storing a current voltage step value (for example, the current voltage step value is N), wherein the current voltage step value is related to the current output voltage Vout of the regulated power supply, that is, the current voltage step value corresponds to the current output voltage Vout one by one. The voltage range comparison voltage 32 is mainly used to compare a current voltage range value (for example, the current voltage range value is N) with a target voltage range value (for example, the target voltage range value is M), and output a comparison result to the voltage range adjustment circuit 33. The voltage gear adjusting circuit 33 is mainly configured to adjust the current voltage gear value according to the comparison result, that is, when the current voltage gear value is not equal to the target voltage gear value, the current voltage gear value is adjusted according to the target voltage gear value until the current voltage gear value is equal to the target gear value, and a control signal is output in the process of adjusting the current voltage gear, where the control signal can adjust the resistance value of the first resistor R1. The voltage gear adjusting device can be used for conveniently adjusting the voltage gear, and further adjusting the output voltage Vout by adjusting the voltage gear.
In one embodiment, as shown in fig. 3, the voltage step adjustment device 30 further includes a delay circuit 34, the current voltage step storage device 31, the voltage step comparison circuit 32, the voltage step adjustment circuit 33 and the delay circuit 34 are connected in sequence, the delay circuit 34 is connected to the third terminal of the first resistor R1, and the delay circuit 34 outputs a control signal to adjust the resistance of the first resistor R1.
Specifically, when the voltage gear adjustment circuit 33 adjusts the voltage gear value, that is, when the current voltage gear value (for example, the current voltage gear value is N) is adjusted to the target gear value (for example, the target voltage gear value is M), the adjustment is usually performed in a certain adjustment manner (for example, one gear value, 2 gear values, or T gear values are adjusted at a time), and is not completed at a time (that is, the voltage gear value is directly adjusted from N to M at a time), and when the voltage gear value is adjusted any two times, the time interval should be set, that is, there is a time delay (for example, N is adjusted to N +1 first, and T is delayed) when the two voltage gear values are adjustedDAfter which time N +1 is adjusted to N + 2). Since the fast adjustment of the voltage stage value during the adjustment of the voltage stage value is likely to cause the fluctuation of the output voltage Vout (i.e. may cause the undershoot voltage to be too low or the overshoot voltage to be too high), it is not favorable for outputtingIn order to avoid the instability of the power supply caused by the generation of an excessive undershoot voltage, the stable output of the voltage Vout adopts a method of gradually adjusting the voltage step value. As such, the delay circuit 34 is primarily used for delaying the time when the current voltage gear is adjusted.
In one embodiment, as shown in fig. 3, the dc regulated power supply further includes: a band-gap reference module 40, wherein the input end of the band-gap reference module 40 is used for connecting an external power supply VDDThe output terminal of the bandgap reference module 40 is connected to the positive input terminal of the error amplifier U1, and the bandgap reference module 40 is configured to generate a reference voltage.
In particular, reference voltages and reference currents are often used in analog circuits, and these reference quantities have a small relationship with power supply and process parameters, so that these reference quantities usually provide accurate operating voltages and bias currents, etc. for the respective circuit blocks through appropriate circuits. In the present embodiment, the input terminal of the bandgap reference module 40 is connected to the external power supply VDDConnected and the output is connected to the positive input of error amplifier U1. The bandgap reference module 40 is used for generating a reference voltage, and effectively ensures stable and accurate operation of the output voltage of the error amplifier U1.
In one embodiment, the dc regulated power supply further includes: a third resistor R3 and a first capacitor C1, wherein a first terminal of the third resistor R3 is connected to the third terminal of the adjusting element 10, and a second terminal of the third resistor R3 is grounded through the first capacitor C1.
Specifically, the first capacitor C1 is an output capacitor of the dc regulated power supply, and the third resistor R3 is an equivalent series resistor of the output capacitor C1. One end of the third resistor R3 is connected to the third end of the adjusting device 10 and connected to the voltage output terminal Vout, and the other end of the third resistor R3 is grounded through the first capacitor C1. Because the dc regulated power supply is composed of the error amplifier U1, the regulated power supply 10, the feedback resistor network module 20, and the like, when the dc regulated power supply operates, the error amplifier U1, the regulated power supply 10, the feedback resistor network module 20, and the like may affect the stability of the dc regulated power supply, and the output capacitor C1 and the equivalent series resistor R3 may be used to compensate the dc regulated power supply, thereby enhancing the stability of the dc regulated power supply.
In one embodiment, as shown in fig. 3, the dc regulated power supply further includes: a first end of the fourth resistor R4 and a first end of the fourth resistor R4 are connected to the third end of the adjusting element 10, and a second end of the fourth resistor R4 is grounded.
Specifically, the fourth resistor R4 is a load resistor of the dc regulated power supply, wherein a first end of the fourth resistor R4 is connected to the third end of the regulating element 10 and to the voltage output terminal Vout, and a second end of the fourth resistor R4 is grounded. Because the dc regulated power supply is composed of the error amplifier U1, the regulated power supply 10, the feedback resistor network module 20, and the like, when the dc regulated power supply operates, the error amplifier U1, the regulated power supply 10, the feedback resistor network module 20, and the like may affect the stability of the dc regulated power supply, and the dc regulated power supply can be compensated by the load resistor (i.e., the fourth resistor R4), thereby enhancing the stability of the dc regulated power supply.
In one embodiment, as shown in fig. 4, the adjusting element 10 is a MOS transistor, wherein a gate of the MOS transistor is a first terminal of the adjusting element 10, a drain of the MOS transistor is a second terminal of the adjusting element 10, and a source of the MOS transistor is a third terminal of the adjusting element 10. The grid of the MOS tube is connected with the output end of the error amplifier U1, and the drain of the MOS tube is used for connecting an external power supply VDDThe source of the MOS transistor is connected to the first end of the first resistor R1, the first end of the third resistor R3, and the first end of the fourth resistor R4, respectively, and is used for connecting the voltage output terminal Vout.
A Metal-Oxide-Semiconductor Field-Effect Transistor (MOS Transistor), referred to as a mosfet for short, is a Field-Effect Transistor (fet) that can be widely used in analog circuits and digital circuits. MOS devices can be classified into two types, i.e., N-type and P-type, according to their "channel" (working carrier) polarities, and are also commonly referred to as NMOSFET and PMOS. The NMOS transistor and the PMOS transistor are commonly used transistors and are very convenient to use.
As shown in fig. 4, the operating principle of the dc regulated power supply in this embodiment is as follows: the output voltage Vout is adjusted by changing the voltage drop across the adjusting element 10 (i.e. MOS transistor), the band gapThe reference module 40 is used for generating a reference voltage which does not change with the power supply voltage and the temperature, and the error amplifier U1 is used for comparing the output voltage Vout with a reference voltage VREFAnd outputting the difference value to control the MOS tube. The first resistor R1 is a variable resistor, and the voltage step adjustment device 30 is connected to the first resistor R1, so as to adjust the resistance of the first resistor R1, and when the resistance of the first resistor R1 changes, the output voltage Vout also changes, so that the output voltage Vout can be adjusted by adjusting the resistance of the first resistor R1.
As a preferred embodiment, the adjusting element 10 generally employs a PMOS transistor, and since the drain of the PMOS transistor is connected in parallel with the load, the output terminal is a high impedance node, the output impedance of the dc regulated power supply is large and affected by the load, and the output terminal generally introduces a pole located in a low frequency band to the system, thereby enhancing the stability of the system.
FIG. 5 is a schematic diagram of a DC regulated power supply voltage regulation method according to an embodiment of the present invention. As shown in fig. 5, the voltage regulation method in the present embodiment includes the following steps:
step S110, detecting the current output voltage of the voltage output end, determining the current voltage gear value according to the current output voltage, and obtaining the target voltage gear value.
And step S120, comparing the current voltage gear position value with the target voltage gear position value.
And step S130, when the current voltage gear value is not equal to the target voltage gear value, gradually adjusting the current voltage gear value according to the target voltage gear value until the current voltage gear value is equal to the target voltage gear value, and outputting a control signal.
Step S140, adjusting the resistance of the first resistor according to the control signal, thereby adjusting the output voltage of the voltage output terminal.
Specifically, as known from the dc regulated power supply, the voltage step adjustment device 30 is mainly used to adjust the resistance of the first resistor R1, so as to adjust the output voltage Vout, and it can be seen that the resistance of the first resistor R1 corresponds to the output voltage Vout. The current voltage gear stage value (for example, the current voltage gear stage value is N) is determined according to the current output voltage Vout value, and the voltage gear stage value used for the target output voltage Vout value pair is recorded as a target voltage gear stage value (for example, the target voltage gear stage value is M), wherein the current voltage gear stage value corresponds to the current output voltage Vout one by one, and the target voltage gear stage value corresponds to the target output voltage Vout one by one.
In the present embodiment, the voltage step adjustment device is used to describe the voltage adjustment method of the dc voltage regulator. And detecting the current output voltage of the voltage output end Vout, determining the current voltage gear value according to the current output voltage, and acquiring the target voltage gear value. For example, a current voltage gear value of N and a target voltage gear value of M are obtained, i.e., it is determined that the voltage gear value needs to be adjusted from N to M. The current voltage gear value N may be stored in the current voltage gear storage device O, and assigned as N, and then transmitted to the voltage gear comparison circuit to be compared with the target voltage gear value M, resulting in a comparison result. Then sending the comparison result to a voltage gear adjusting circuit, when O is not equal to M, the voltage gear adjusting circuit can adjust the current voltage gear value O successively according to the target voltage gear value M until the current voltage gear value O is equal to the target voltage gear value M, wherein an interval time is provided when the current voltage gear value is adjusted each time, and in the process of adjusting the current voltage gear value O to the target voltage gear value M, a delay circuit outputs a control signal; the control signal may thus be used to adjust the resistance of the first resistor R1.
The voltage regulation method of the direct current regulated voltage adopts the direct current regulated power supply, so that the output voltage Vout of the direct current regulated power supply can be conveniently regulated as long as the resistance value of the first resistor R1 is regulated.
In one embodiment, when the current voltage gear value is not equal to the target voltage gear value, the step of adjusting the current voltage gear value according to the target voltage gear value includes:
when the current voltage gear position value is smaller than the target voltage gear position value, the current voltage gear position value is adjusted in a mode of increasing 1 step by step, and the current voltage gear position value is adjusted every time, the preset time is separated until the current voltage gear position value is equal to the target voltage gear position value.
Specifically, when the value O is smaller than the value M, the current voltage range value is adjusted in an incremental manner, that is, usually, the adjustment is performed in a certain adjustment manner (for example, 1 range value, 2 range values or T range values are adjusted each time), the adjustment is not completed once (that is, the voltage range value is directly adjusted from the value O to the value M once), and when any two ranges of voltage range values are adjusted, the time interval should be provided, that is, two voltage range values are adjusted with time delay (for example, N is adjusted to the value O +1 first, and T is delayedDAfter which time O +1 is adjusted to O + 2). In addition, when the output voltage Vout changes, an undershoot voltage (as shown in fig. 6) is generated, and Va is the current output voltage, Vb is the target output voltage, and Vc is the generated undershoot voltage
Wherein, TRThe time from generation of the undershoot voltage Vc to restoration to the output voltage Vb is related to the establishment time of the direct-current stabilized power supply system, the grid conversion rate of the MOS tube, the gain-bandwidth product of the direct-current stabilized power supply system and the phase margin of the direct-current stabilized power supply system; c1 is an output capacitor, R3 is an equivalent series resistor of the output capacitor, and R4 is a load resistor. When T isRC1, R3, R4 are constants, the undershoot voltage Vc is related only to the difference between Va and Vb. When the undershoot voltage is generated, the power supply system is easy to be unstable, therefore, in the process of adjusting the voltage stage value, the rapid adjustment of the voltage stage value easily causes fluctuation of the output voltage Vout (that is, the undershoot voltage may be too low or the overshoot voltage may be too high), which is not favorable for stable output of the output voltage Vout. In addition, the preset time is based on the time T from generation of the undershoot voltage Vc to restoration to the output voltage VbRDetermined, typically, the predetermined time is greater than or equal to 2TR。
As a preferred embodiment, adjusting the current voltage stage value in increments of 1 per voltage stage value increase minimizes power supply instability.
In one embodiment, when the current voltage gear value is not equal to the target voltage gear value, the step of adjusting the current voltage gear value according to the target voltage gear value further includes:
when the current voltage gear position value is larger than the target voltage gear position value, the current voltage gear position value is adjusted in a mode of decreasing by 1 and decreasing progressively, and the current voltage gear position value is adjusted every time, and is separated by preset time until the current voltage gear position value is equal to the target voltage gear position value.
Specifically, when the value O is smaller than the value M, the current voltage range value is adjusted in an incremental manner, that is, usually, the adjustment is performed in a certain adjustment manner (for example, 1 range value, 2 range values or T range values are adjusted each time), the adjustment is not completed once (that is, the voltage range value is directly adjusted from the value O to the value M once), and when any two range voltage values are adjusted, the time interval should be provided, that is, two voltage range value adjustments are delayed (for example, N is adjusted to the value O-1 first, and T is delayed)DAfter which time O-1 is adjusted to O-2). In the process of adjusting the voltage tap value, rapidly adjusting the voltage tap value easily causes fluctuation of the output voltage Vout (i.e. may cause too low undershoot voltage or too high overshoot voltage), which is not favorable for stable output of the output voltage Vout.
As a preferred embodiment, the current voltage gear value is adjusted in a decreasing manner of 1 per reduction of the voltage gear value, which minimizes power supply instability.
To further understand the method, a detailed example is given. As shown in fig. 7, the voltage regulation method of the dc regulated power supply includes the following specific steps:
in step S71, the output voltage Vout needs to be adjusted from the current range value N to the target range value M.
In step S72, N is stored in the register O, and O is made equal to N.
In step S73, it is determined whether O is greater than M.
Step S74, if yes, subtracting 1 from O, and writing the voltage gear value O into LDO _ VSEL; and delay TDThereafter, step S73 is executed; if so, go to step S74, otherwise, go to step S75.
Step S75, if yes, adding 1 to O, and writing the voltage gear value O into LDO _ VSEL; and delay TDThereafter, step S73 is executed; if so, go to step S74, otherwise, go to step S75.
And step S76, ending when O is equal to M.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A DC regulated power supply comprising: the voltage regulating circuit comprises an error amplifier, a regulating element, a feedback resistance network module and a voltage gear regulating device, wherein the feedback resistance network module comprises a first resistor and a second resistor, and the first resistor is a variable resistor;
the positive input end of the error amplifier is used for accessing a reference voltage, and the output end of the error amplifier is connected with the first end of the adjusting element; the negative input end of the error amplifier is respectively connected with the first end of the first resistor and the first end of the second resistor; the positive power supply end of the error amplifier and the second end of the adjusting element are respectively used for being connected with an external power supply;
the third end of the adjusting element is connected with the second end of the first resistor, and the third end of the adjusting element is a voltage output end;
the first end of the first resistor is connected with the first end of the second resistor, and the third end of the first resistor is connected with the voltage gear adjusting device; the second end of the second resistor is grounded;
the voltage gear adjusting device is used for outputting a control signal to adjust the resistance value of the first resistor;
the voltage gear adjusting device comprises a current voltage gear storage device, a voltage gear comparison circuit, a voltage gear adjusting circuit and a time delay circuit which are sequentially connected;
the current voltage gear storage device is used for storing a current voltage gear value, wherein the current voltage gear value is determined according to the current output voltage of the voltage output end; the current voltage gear value corresponds to the current output voltage one by one;
the voltage gear comparison circuit is used for comparing the current voltage gear value with a target voltage gear value;
the voltage gear adjusting circuit is used for adjusting the current voltage gear value according to the target voltage gear value and outputting the control signal;
the delay circuit is connected with a third end of the first resistor and outputs the control signal to adjust the resistance value of the first resistor;
the DC regulated power supply further includes: the first end of the third resistor is connected with the third end of the adjusting element, and the second end of the third resistor is grounded through the first capacitor;
the DC regulated power supply further includes: a first end of the fourth resistor is connected with the third end of the adjusting element, and a second end of the fourth resistor is grounded;
when the output voltage of the voltage output end changes, undershoot voltage is obtained based on the following formula:
wherein Va is the current output voltage, Vb is the target output voltage, Vc is undershoot voltage, TRFor the time to generate the undershoot voltage Vc to recover to the target output voltage Vb; c1 is the capacitance of the first capacitor, R3 is the resistance of the third resistor, and R4 is the resistance of the fourth resistor.
2. The regulated dc power supply of claim 1, further comprising: the input end of the band-gap reference module is used for being connected with an external power supply, the output end of the band-gap reference module is connected with the positive input end of the error amplifier, and the band-gap reference module is used for generating the reference voltage.
3. The DC regulated power supply according to claim 1, wherein the regulating element is an MOS transistor, wherein a gate of the MOS transistor is a first end of the regulating element, a drain of the MOS transistor is a second end of the regulating element, and a source of the MOS transistor is a third end of the regulating element;
the grid connection of MOS pipe the output of error amplifier, the drain electrode of MOS pipe is used for connecting external power supply, the source electrode of MOS pipe is connected respectively the second end of first resistance the first end of third resistance with the first end of fourth resistance, and is used for connecting the voltage output end.
4. The regulated power supply according to claim 3, wherein said MOS transistor is a PMOS transistor.
5. A voltage regulation method of a DC stabilized power supply according to any one of claims 1 to 4, characterized by comprising the steps of:
detecting the current output voltage of the voltage output end, determining the current voltage gear value according to the current output voltage, and acquiring a target voltage gear value;
comparing the current voltage gear value to the target voltage gear value;
when the current voltage gear value is not equal to the target voltage gear value, gradually adjusting the current voltage gear value according to the target voltage gear value until the current voltage gear value is equal to the target voltage gear value, and outputting the control signal;
and adjusting the resistance value of the first resistor according to the control signal, so as to adjust the output voltage of the voltage output end.
6. The voltage regulation method of a regulated dc power supply according to claim 5, wherein the step of adjusting the current voltage stage value according to the target voltage stage value when the current voltage stage value is not equal to the target voltage stage value comprises:
when the current voltage gear position value is smaller than the target voltage gear position value, the current voltage gear position value is adjusted in a mode of increasing 1 step by step, and the current voltage gear position value is adjusted every time, the preset time is separated until the current voltage gear position value is equal to the target voltage gear position value.
7. The voltage regulation method of a regulated dc power supply according to claim 5 or 6, wherein the step of adjusting the current voltage stage value according to the target voltage stage value when the current voltage stage value is not equal to the target voltage stage value further comprises:
when the current voltage gear position value is larger than the target voltage gear position value, the current voltage gear position value is adjusted in a mode of decreasing by 1 and decreasing progressively, and the current voltage gear position value is adjusted every time, and is separated by preset time until the current voltage gear position value is equal to the target voltage gear position value.
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| CN109947165A (en) * | 2019-01-31 | 2019-06-28 | 敦泰电子有限公司 | Voltage reference source circuit and low-power dissipation power supply system |
| CN110703839B (en) * | 2019-11-08 | 2020-11-03 | 中电科仪器仪表有限公司 | Power supply and power supply method of universal ultra-low noise radio frequency circuit |
| CN114189217B (en) * | 2021-12-17 | 2022-08-30 | 中船重工安谱（湖北）仪器有限公司 | High-gain pulse current amplifying circuit |
| CN114421897B (en) * | 2022-01-24 | 2023-12-08 | 江苏润石科技有限公司 | Circuit for reducing noise of integrated circuit amplifier and noise reduction method thereof |
| CN116841341B (en) * | 2023-09-01 | 2023-12-12 | 合肥智芯半导体有限公司 | Multi-voltage generating device, multi-voltage calibration system and chip device |
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