CN211506288U - Low dropout discrete voltage stabilizing circuit - Google Patents
Low dropout discrete voltage stabilizing circuit Download PDFInfo
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- CN211506288U CN211506288U CN201922348438.XU CN201922348438U CN211506288U CN 211506288 U CN211506288 U CN 211506288U CN 201922348438 U CN201922348438 U CN 201922348438U CN 211506288 U CN211506288 U CN 211506288U
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Abstract
The utility model relates to a vertical voltage stabilizing circuit of low pressure difference, this vertical voltage stabilizing circuit of low pressure difference includes: the load pre-charging circuit comprises a switch control circuit, a voltage adjusting circuit, a sampling feedback circuit and a load pre-charging circuit; the switch control circuit is connected with a constant current source in the voltage adjusting circuit so as to control the on-off of the constant current source; the sampling feedback circuit is suitable for sampling the voltage of the output end of the voltage regulating circuit and converting the sampled voltage into current to be fed back to a constant current source in the voltage regulating circuit, and the voltage regulating circuit is suitable for performing voltage-stabilizing output on a load; the switch control circuit is also suitable for controlling the on-off of the load pre-charging circuit, and after the voltage adjusting circuit is started, the load pre-charging circuit is suitable for completing the pre-charging operation of the load in fixed delay time; the utility model discloses a switch control, the starting process carries out the current-limiting, possesses extremely low input/output minimum pressure differential, has guaranteed output voltage's stability.
Description
Technical Field
The utility model relates to a low pressure DC power supply field especially relates to a vertical voltage stabilizing circuit of low pressure difference.
Background
The power supply of the wireless radio frequency module has the conditions that transient current is large (> 2A), normal current is small (<100mA), power supply voltage is 4V, and nonstandard 3.3V or 5V and the like, and the scheme for supplying power to the wireless radio frequency module needs to meet the conditions of transient low-voltage difference and large-current output, switch control, current limiting in the starting process, ultralow voltage difference of input and output after the starting and the like. The types of the integrated circuit chips on the market are few, the price is high, and the selection is difficult.
Therefore, it is desirable to develop a new low voltage differential vertical voltage regulator circuit to solve the above problems.
Disclosure of Invention
The utility model aims at providing a vertical voltage stabilizing circuit of low pressure difference to solve low pressure DC power supply and how to realize that low-voltage difference, heavy current carry out the problem of steady voltage output.
In order to solve the technical problem, the utility model provides a low pressure difference voltage stabilizing circuit that stands, it includes: the load pre-charging circuit comprises a switch control circuit, a voltage adjusting circuit, a sampling feedback circuit and a load pre-charging circuit; the switch control circuit is connected with a constant current source in the voltage adjusting circuit so as to control the on-off of the constant current source; the sampling feedback circuit is suitable for sampling the voltage of the output end of the voltage regulating circuit and converting the sampled voltage into current to be fed back to a constant current source in the voltage regulating circuit, and the voltage regulating circuit is suitable for performing voltage-stabilizing output on a load; the switch control circuit is also suitable for controlling the on-off of the load pre-charging circuit, and after the voltage adjusting circuit is started, the load pre-charging circuit is suitable for completing the pre-charging operation of the load with fixed delay time.
Further, the switch control circuit controls the grounding of the constant current source in the voltage adjusting circuit through a switching-on/off MOS tube so as to realize the switching-on/off control.
Further, the voltage adjustment circuit includes: the output MOS tube and the feedback triode are electrically connected with the constant current source; the feedback triode is connected with the sampling feedback circuit; the sampling feedback circuit feeds back a voltage value obtained by sampling to a constant current source of the voltage adjusting circuit in a current mode through the feedback triode so as to realize the output control of the output MOS tube on a load.
Further, the sampling feedback circuit includes: the feedback circuit and the voltage stabilizing tube are electrically connected with the feedback circuit; the feedback circuit is connected with the output end of the voltage adjusting circuit, and is suitable for feeding back the voltage adjusting circuit to the voltage adjusting circuit after voltage sampling is carried out on the voltage adjusting circuit to form a current feedback signal; the voltage regulator tube is suitable for stabilizing the voltage of the feedback circuit.
Further, the load pre-charge circuit includes: the device comprises a first load current-limiting resistor, a second load current-limiting resistor, an RC circuit and a pre-charging MOS tube; when the output voltage of the output end of the voltage adjusting circuit rises, a capacitor is charged in the delay time of the RC circuit through the first load current-limiting resistor and the second load current-limiting resistor, and after the capacitor is charged to a set value, the pre-charging MOS tube is conducted to control the capacitor to discharge.
Further, the output MOS tube is an NPN type MOS tube.
The beneficial effects of the utility model are that, the utility model discloses a switch control circuit carries out start control, realizes output voltage's negative feedback regulation jointly by voltage adjustment circuit, sample feedback circuit, possesses extremely low input/output minimum pressure differential, has guaranteed output voltage's stability to carry out time delay and current-limiting control through load pre-charge circuit and in order to avoid appearing heavy current output in the twinkling of an eye electrifying.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a circuit diagram of the low-voltage differential vertical voltage stabilizing circuit of the present invention.
In the figure: the circuit comprises a first load current-limiting resistor R1, a second load current-limiting resistor R2, a resistor R3, a resistor R8, a resistor R10, an output MOS tube VT1, a pre-charging MOS tube VT2, a triode VT3, a feedback triode VT4, an on-off MOS tube VT5, a capacitor C2, a diode VD1, a diode VD2, a diode VD3 and a voltage-stabilizing tube TS 1.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Example 1
In this embodiment, as shown in fig. 1, the present embodiment provides a low voltage differential vertical voltage regulator circuit, which includes: the load pre-charging circuit comprises a switch control circuit, a voltage adjusting circuit, a sampling feedback circuit and a load pre-charging circuit; the switch control circuit is connected with a constant current source in the voltage adjusting circuit so as to control the on-off of the constant current source; the sampling feedback circuit is suitable for sampling the voltage of the output end of the voltage regulating circuit and converting the sampled voltage into current to be fed back to a constant current source in the voltage regulating circuit, and the voltage regulating circuit is suitable for performing voltage-stabilizing output on a load; the switch control circuit is also suitable for controlling the on-off of the load pre-charging circuit, and after the voltage adjusting circuit is started, the load pre-charging circuit is suitable for completing the pre-charging operation of the load with fixed delay time.
In this embodiment, the switch control circuit is used for start control, the voltage regulation circuit and the sampling feedback circuit jointly realize negative feedback regulation of the output voltage, the minimum input-output voltage difference is extremely low, the stability of the output voltage is ensured, and the load pre-charging circuit is used for delay and current-limiting control to avoid large current output at the moment of power-on.
In order to realize the switching control function, the switching control circuit controls the grounding of a constant current source in the voltage adjusting circuit through a switching MOS tube VT5 so as to realize the switching control.
In this embodiment, the constant current source in the voltage adjustment circuit includes a transistor VT3, a diode VD1, a diode VD2, a diode VD3, and a resistor R8, and the current flowing through the resistor R8 is the same as the current flowing through the resistor R3.
The drain of the switching control circuit on-off MOS transistor VT5 (in this embodiment, a PNP MOS transistor is used) is connected to the resistor R8 of the voltage adjustment circuit, so as to control on-off of the constant current source where the resistor R8 is located.
In order to perform a regulated output, the voltage adjustment circuit includes: the output MOS tube VT1 and the feedback triode VT4 are electrically connected with the constant current source; the feedback transistor VT4 is connected with the sampling feedback circuit; the sampling feedback circuit feeds back the sampled voltage value to a constant current source of the voltage adjusting circuit in a current mode through the feedback triode VT4 so as to realize the output control of the output MOS tube VT1 to a load.
In this embodiment, the output MOS transistor VT1 (in this embodiment, an NPN MOS transistor is used) of the voltage adjustment circuit has a complete on-resistance at a milliohm level, so as to ensure that the voltage adjustment circuit has an extremely low minimum differential voltage between input and output, and ensure the stability of the output voltage.
To achieve negative feedback regulation of the output voltage, the sampling feedback circuit comprises: the feedback circuit, TS1 of stabilivolt that couples to said feedback circuit electrical behavior; the feedback circuit is connected with the output end of the voltage adjusting circuit, and is suitable for feeding back the voltage adjusting circuit to the voltage adjusting circuit after voltage sampling is carried out on the voltage adjusting circuit to form a current feedback signal; the voltage regulator tube TS1 is adapted to regulate the feedback circuit.
In this embodiment, the sampling feedback circuit is connected in series with the voltage regulation circuit, and the voltage value monitored by the sampling feedback circuit is fed back to the resistor R8 of the constant current source in the voltage regulation circuit in the form of current through the feedback transistor VT4, so as to influence the current flowing through the resistor R3, thereby realizing the control of the output MOS transistor VT 1.
In this embodiment, the transistor VT3 of the voltage regulation circuit operates as a current source, so the resistor R8 and the resistor R3 have an equal current relationship, and receive the current feedback signal of the sampling feedback circuit through the feedback transistor VT4 to act on the resistor R8, and further control the gate-source voltage of the output MOS transistor VT1 through the resistor R3, thereby realizing the output of stable voltage.
In the present embodiment, the sampling feedback circuit and the voltage adjustment circuit together implement negative feedback regulation of the output voltage.
In order to avoid large current output at the moment of power-on, the load pre-charging circuit comprises: the circuit comprises a first load current-limiting resistor R1, a second load current-limiting resistor R2, an RC circuit and a precharge MOS tube VT 2; when the output voltage of the output end of the voltage adjusting circuit rises, a capacitor is charged in the delay time of the RC circuit through the first load current-limiting resistor R1 and the second load current-limiting resistor R2, and after the capacitor is charged to a set value, the pre-charge MOS tube VT2 is conducted to control the capacitor to discharge.
The load pre-charging circuit is connected with the sampling feedback circuit in series, and the working states of the voltage adjusting circuit and the sampling feedback circuit are not influenced; the RC circuit (capacitor C2, resistor R10) of the load precharge circuit delays the time and is controlled by the switch control circuit.
The load pre-charging circuit is controlled by the switch control circuit, so that the time delay of the RC circuit (the capacitor C2 and the resistor R10) is started after the voltage adjusting circuit is started, and the load pre-charging circuit can finish the pre-charging of the load within fixed RC delay time at any time when the power is on.
The load pre-charging circuit charges the voltage at the end V4 to a set value of 4V, so that the large current output of the voltage adjusting circuit at the moment of electrifying is avoided, and then the pre-charging MOS tube VT2 is conducted, so that the low-conduction internal resistance output is realized.
In order to ensure that the voltage regulation circuit has an extremely low minimum voltage difference between input and output to ensure the stability of the output voltage, the output MOS transistor VT1 is an NPN type MOS transistor.
To sum up, the utility model discloses a switch control circuit carries out start control, realizes output voltage's negative feedback regulation jointly by voltage adjustment circuit, sample feedback circuit, possesses extremely low input/output minimum pressure differential, has guaranteed output voltage's stability to carry out time delay and current-limiting control through load pre-charge circuit and in order to avoid appearing heavy current output in the twinkling of an eye at the circular telegram.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A low-voltage differential vertical voltage regulator circuit, comprising:
the load pre-charging circuit comprises a switch control circuit, a voltage adjusting circuit, a sampling feedback circuit and a load pre-charging circuit; wherein
The switch control circuit is connected with the constant current source in the voltage adjusting circuit to control the on-off of the constant current source;
the sampling feedback circuit is suitable for sampling the voltage of the output end of the voltage regulating circuit and converting the sampled voltage into current to be fed back to a constant current source in the voltage regulating circuit, and the voltage regulating circuit is suitable for performing voltage-stabilizing output on a load;
the switch control circuit is also suitable for controlling the on-off of the load pre-charging circuit, and after the voltage adjusting circuit is started, the load pre-charging circuit is suitable for completing the pre-charging operation of the load with fixed delay time.
2. The low voltage differential vertical voltage regulator circuit of claim 1,
the switch control circuit controls the grounding of a constant current source in the voltage adjusting circuit through a switching-on/off MOS tube so as to realize the switching-on/off control.
3. The low voltage differential vertical voltage regulator circuit of claim 1,
the voltage adjustment circuit includes: the output MOS tube and the feedback triode are electrically connected with the constant current source;
the feedback triode is connected with the sampling feedback circuit;
the sampling feedback circuit feeds back a voltage value obtained by sampling to a constant current source of the voltage adjusting circuit in a current mode through the feedback triode so as to realize the output control of the output MOS tube on a load.
4. The low voltage differential vertical voltage regulator circuit of claim 1,
the sampling feedback circuit includes: the feedback circuit and the voltage stabilizing tube are electrically connected with the feedback circuit;
the feedback circuit is connected with the output end of the voltage adjusting circuit, and is suitable for feeding back the voltage adjusting circuit to the voltage adjusting circuit after voltage sampling is carried out on the voltage adjusting circuit to form a current feedback signal;
the voltage regulator tube is suitable for stabilizing the voltage of the feedback circuit.
5. The low voltage differential vertical voltage regulator circuit of claim 1,
the load pre-charge circuit includes: the device comprises a first load current-limiting resistor, a second load current-limiting resistor, an RC circuit and a pre-charging MOS tube;
when the output voltage of the output end of the voltage adjusting circuit rises, a capacitor is charged in the delay time of the RC circuit through the first load current-limiting resistor and the second load current-limiting resistor, and after the capacitor is charged to a set value, the pre-charging MOS tube is conducted to control the capacitor to discharge.
6. The low voltage differential vertical voltage regulator circuit of claim 3,
the output MOS tube is an NPN type MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922348438.XU CN211506288U (en) | 2019-12-24 | 2019-12-24 | Low dropout discrete voltage stabilizing circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922348438.XU CN211506288U (en) | 2019-12-24 | 2019-12-24 | Low dropout discrete voltage stabilizing circuit |
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| CN211506288U true CN211506288U (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093853A (en) * | 2021-04-15 | 2021-07-09 | 东北大学 | LDO circuit for realizing low input/output voltage difference in low-voltage starting process |
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2019
- 2019-12-24 CN CN201922348438.XU patent/CN211506288U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093853A (en) * | 2021-04-15 | 2021-07-09 | 东北大学 | LDO circuit for realizing low input/output voltage difference in low-voltage starting process |
| CN113093853B (en) * | 2021-04-15 | 2022-08-23 | 东北大学 | Improved LDO circuit for realizing low input/output voltage difference in low-voltage starting process |
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