CN216794972U - Switching circuit of low-voltage power supply - Google Patents
Switching circuit of low-voltage power supply Download PDFInfo
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- CN216794972U CN216794972U CN202220343218.7U CN202220343218U CN216794972U CN 216794972 U CN216794972 U CN 216794972U CN 202220343218 U CN202220343218 U CN 202220343218U CN 216794972 U CN216794972 U CN 216794972U
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Abstract
The utility model discloses a switching circuit of a low-voltage power supply, which comprises a PMOS (P-channel metal oxide semiconductor) tube connected with the input of a circuit at an S pole, and a circuit output connected with a D pole; the negative pressure generation module is connected with the G utmost point of PMOS pipe and trigger module's output respectively, and the negative pressure generation module includes: one end of the first resistor is connected to the output end of the trigger module; one end of the first capacitor is connected with the other end of the first resistor; the cathode of the first diode and the anode of the second diode are respectively connected with the other end of the first capacitor; and one end of the second capacitor is respectively connected with the anode of the first diode and the G pole of the PMOS tube, and the other end of the second capacitor is connected with the cathode of the second diode. The utility model generates a negative voltage source by using pulse wave or PWM wave generated by the trigger module, and the negative voltage source is connected to the G pole of the PMOS tube, so that the voltage between the G pole and the S pole of the PMOS tube is increased, and the PMOS tube is well conducted.
Description
Technical Field
The utility model relates to the field of integrated circuit design, in particular to a switching circuit of a low-voltage power supply.
Background
The PMOS power switch tube driving circuit is simple and wide in application range, and is commonly used on a power switch circuit, but in the application scene of lower voltage, the voltage between the G pole and the S pole of the PMOS tube is not enough to enable the PMOS tube to be well conducted, so that the application of the PMOS tube in lower voltage is limited.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide a switching circuit for a low voltage power supply to solve the above-mentioned problems of the prior art.
In order to realize the purpose, the following technical scheme is adopted:
the utility model provides a switching circuit of low voltage power supply, includes a PMOS pipe, the S utmost point connecting circuit input of PMOS pipe, its D utmost point connecting circuit output still include a negative pressure generation module, the negative pressure generation module respectively with the G utmost point of PMOS pipe and the output of trigger module are connected, the trigger module is used for producing high level and the alternate pulse wave of low level or PWM ripples to the negative pressure generation module, wherein, the negative pressure generation module includes:
one end of the first resistor is connected to the output end of the trigger module;
one end of the first capacitor is connected with the other end of the first resistor;
the cathode of the first diode and the anode of the second diode are respectively connected with the other end of the first capacitor;
and one end of the second capacitor is respectively connected with the anode of the first diode and the G pole of the PMOS tube, and the other end of the second capacitor is connected with the cathode of the second diode.
Further, the trigger module is a BUCK circuit.
Further, the cathode of the second diode and one end of the second capacitor are commonly grounded.
Furthermore, the negative pressure generation module further comprises a second resistor, and two ends of the second resistor are respectively connected with the S pole and the G pole of the PMOS tube.
By adopting the scheme, the utility model has the beneficial effects that:
a negative voltage source is generated by using pulse waves or PWM waves generated by a trigger module and is connected to the G electrode of the PMOS tube, so that the voltage between the G electrode and the S electrode of the PMOS tube is increased, and the PMOS tube is well conducted;
the switch circuit has simple structure and small occupied space.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The utility model is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, a switch circuit of a low voltage power supply is provided, which includes a PMOS transistor Q1, a PMOS transistor Q1 having an S-pole input connected to a D-pole output connected to a circuit, and a negative voltage generating module 1, where the negative voltage generating module 1 is respectively connected to a G-pole of the PMOS transistor Q1 and an output of the trigger module 2, the trigger module 2 is configured to generate a pulse wave or a PWM wave alternating between a high level and a low level to the negative voltage generating module, and the negative voltage generating module 1 includes:
a first resistor R1, one end of which is connected to the output end of the trigger module 2;
a first capacitor C1, one end of which is connected to the other end of the first resistor R1;
a first diode D1 and a second diode D2, wherein the cathode of the first diode D1 and the anode of the second diode D2 are respectively connected to the other end of the first capacitor C1;
and one end of a second capacitor C2, the second capacitor C2 is connected to the anode of the first diode D1 and the G-pole of the PMOS transistor Q1, respectively, and the other end is connected to the cathode of the second diode D2.
The trigger module 2 is a BUCK circuit. As a supplement, the triggering module 2 can also be a dedicated pulser or PWM wave generator.
The cathode of the second diode D2 and one end of the second capacitor C2 are commonly grounded.
The negative voltage generation module 1 further comprises a second resistor R2, and two ends of the second resistor R2 are respectively connected with the S pole and the G pole of the PMOS transistor Q1.
Description of the principle: when the switch is turned on, the trigger module 2 outputs pulse waves or PWM waves, wherein when the input of the negative voltage generation module is at a high level, a loop is formed by current through a first resistor R1, a first capacitor C1 and a second diode D2 to charge a first capacitor C1, and the current direction is from the first resistor R1 to a first capacitor C1; when the input waveform is low level, the current forms a loop through the first resistor R1, the first capacitor C1, the first diode D1 and the second capacitor C2, the first capacitor C1 discharges, the second capacitor C2 charges, the current direction is from the first capacitor C1 to the first resistor R1, the voltage appears at two ends of the second capacitor C2 after charging, the current input end of the second capacitor C2 is grounded, so the other end voltage is negative, the voltage between the S pole and the G pole of the PMOS transistor Q1 is equal to the voltage (absolute value) between the input power of the input circuit and two ends of the second capacitor C2, and the PMOS transistor Q1 can be well conducted.
When the switch is turned off, the trigger module circuit does not output waveforms, after a steady state, the voltage of the negative voltage generation module 1 is the sum of the conduction voltages of the first diode D1 and the second diode D2, the voltage between the S pole and the G pole of the PMOS transistor Q1 is equal to the input power voltage minus the conduction voltages of the first diode D1 and the second diode D2, and the PMOS transistor Q1 is not conducted in a low-voltage application scene.
From the above embodiments, the present invention utilizes the pulse wave or PWM wave generated by the trigger module 2 to generate a negative voltage source, and the negative voltage source is connected to the G electrode of the PMOS transistor Q1, so as to increase the voltage between the G electrode and the S electrode of the PMOS transistor Q1, thereby making the PMOS transistor Q1 conduct well; the circuit provided by the utility model has a simple structure and small occupied space.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a switching circuit of low voltage power supply, includes a PMOS pipe, the S utmost point connecting circuit input of PMOS pipe, its D utmost point connecting circuit output, its characterized in that still includes a negative pressure generation module, the negative pressure generation module respectively with the G utmost point of PMOS pipe and trigger module' S output are connected, trigger module is used for producing high level and the alternative pulse wave of low level or PWM ripples extremely the negative pressure generation module, wherein, the negative pressure generation module includes: one end of the first resistor is connected to the output end of the trigger module;
one end of the first capacitor is connected with the other end of the first resistor;
the cathode of the first diode and the anode of the second diode are respectively connected with the other end of the first capacitor;
and one end of the second capacitor is respectively connected with the anode of the first diode and the G pole of the PMOS tube, and the other end of the second capacitor is connected with the cathode of the second diode.
2. The switching circuit of a low voltage power supply according to claim 1, wherein the triggering module is a BUCK circuit.
3. The switching circuit for a low voltage power supply according to claim 2, wherein a cathode of said second diode and one end of said second capacitor are commonly grounded.
4. The switching circuit of a low voltage power supply according to claim 2, wherein the negative voltage generating module further comprises a second resistor, and two ends of the second resistor are respectively connected to the S pole and the G pole of the PMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220343218.7U CN216794972U (en) | 2022-02-18 | 2022-02-18 | Switching circuit of low-voltage power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220343218.7U CN216794972U (en) | 2022-02-18 | 2022-02-18 | Switching circuit of low-voltage power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216794972U true CN216794972U (en) | 2022-06-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220343218.7U Active CN216794972U (en) | 2022-02-18 | 2022-02-18 | Switching circuit of low-voltage power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216794972U (en) |
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2022
- 2022-02-18 CN CN202220343218.7U patent/CN216794972U/en active Active
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