CN215990303U - Stable power supply switching control circuit for satellite communication chip - Google Patents
Stable power supply switching control circuit for satellite communication chip Download PDFInfo
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- CN215990303U CN215990303U CN202121663020.9U CN202121663020U CN215990303U CN 215990303 U CN215990303 U CN 215990303U CN 202121663020 U CN202121663020 U CN 202121663020U CN 215990303 U CN215990303 U CN 215990303U
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Abstract
The utility model relates to a stable power supply switching control circuit for a satellite communication chip, which specifically comprises: the device comprises a power supply, a voltage detection unit, a P-channel low-voltage MOS field effect transistor and a switching unit. Wherein, the power supply comprises an external power supply and an internal power supply; the voltage detection unit is communicated with the power supply, detects a voltage value passing through the voltage detection unit and compares the voltage value with a preset value; the P-channel low-voltage MOS field effect transistor is electrically connected with the voltage detection unit; and the switching unit is electrically connected with the voltage detection unit and drives the P-channel low-voltage MOS field effect transistor to be switched on or switched off. The comparator is used for monitoring the external power supply in the power supply circuit, the internal and external power supplies are controlled and switched in advance for monitoring the external power supply, the design cost is reduced, convenience and stability are provided, and the output power supply is stable and reliable when the internal and external power supplies are switched.
Description
Technical Field
The utility model relates to a power supply switching control circuit, in particular to a stable power supply switching control circuit for a satellite communication chip.
Background
The stable power supply switching control circuit is used as a control circuit for switching internal and external power supplies, and can ensure that an electronic product can work stably and reliably. However, when a problem occurs in the power supply circuit of the expensive chip with special purpose, the chip may not work normally, even be damaged, and thus a huge loss may be caused.
In the prior art, the vehicle-mounted satellite communication equipment adopts two common power supply modes of an internal power supply and an external power supply, the external power supply adopts a DC-DC power supply module, the internal power supply adopts a power supply module which is similar to the stability of a lithium battery as a standby power supply, if the internal power supply and the external power supply are switched, the output voltage is not stable, the phenomena of power supply voltage falling, lifting and the like occur, the chip can be reset or damaged, and the stability of the product performance is seriously influenced.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the stable power supply switching control circuit for the satellite communication chip is used for the occasion that a special chip is applied to switching of internal and external power supplies, the external power supply is monitored by using a comparator in the power supply circuit, the internal and external power supplies are controlled and switched in advance by monitoring the external power supply, basic elements such as a safe and reliable comparator, a resistor, a triode, an MOS (metal oxide semiconductor) tube and the like are adopted in the circuit, the design cost is reduced, convenience and stability are provided, and when the internal and external power supplies are switched, the output power supply is stable and reliable.
The technical scheme is as follows: a graceful power switching control circuit for a satellite communication chip, comprising: the device comprises a power supply, a voltage detection unit, a P-channel low-voltage MOS field effect transistor and a switching unit. Wherein, the power supply comprises an external power supply and an internal power supply; the voltage detection unit is communicated with the power supply, detects a voltage value passing through the voltage detection unit and compares the voltage value with a preset value; the P-channel low-voltage MOS field effect transistor is electrically connected with the voltage detection unit; and the switching unit is electrically connected with the voltage detection unit and drives the P-channel low-voltage MOS field effect transistor to be switched on or switched off.
In a further embodiment, the positive electrode of the external power supply is connected to the input end of the DC-DC module, and the series-connected voltage-dividing resistor is grounded.
The DC-DC module outputs a power supply to supply power to the comparator power supply, and is connected in series with a fourth voltage-dividing resistor and a fifth voltage-dividing resistor to divide voltage to ground; and the connection point of the fourth voltage-dividing resistor and the fifth voltage-dividing resistor is connected with the positive phase input end of the comparator.
In a further embodiment, the voltage detection unit further includes:
and the comparator monitors the external power supply in cooperation with the current-limiting resistor and the voltage-dividing resistor, and the inverting input end of the comparator is connected with the connection point of the second voltage-dividing resistor and the third voltage-dividing resistor.
In a further embodiment, the switching unit further comprises:
and the NPN triode is electrically connected with the current-limiting resistor and grounded to control the P-channel low-voltage MOS field effect transistor to be switched on or switched off.
The P-channel low-voltage MOS field effect transistor is electrically connected with the current-limiting resistor and the internal power lithium battery VBAT, and the conduction condition of the internal power supply is controlled according to the input condition of the external power supply.
In a further embodiment, the output end of the comparator is connected in series with a sixth current-limiting resistor and a seventh current-limiting resistor to the ground, and the connection point of the sixth current-limiting resistor and the seventh current-limiting resistor is connected to the base of the NPN triode;
the output end of the DC-DC power supply module is connected with the source electrode of the P-channel low-voltage MOS field effect transistor, an eighth current-limiting resistor and a ninth current-limiting resistor are connected in series and are connected to the collector electrode of the NPN triode, the connection point of the eighth current-limiting resistor and the ninth current-limiting resistor is connected with the grid electrode of the P-channel low-voltage MOS field effect transistor, and the emitting electrode of the triode Q1 is grounded; the drain electrode of the P-channel low-voltage MOS field effect transistor is connected with the anode of the internal power lithium battery VBAT.
In a further embodiment, the negative pole of the external power supply is connected with the DC-DC module, the comparator and the VBAT component of the internal power supply lithium battery in a common ground mode.
Has the advantages that: in the design of the internal and external power circuits, the utility model firstly realizes the monitoring of the external power by using the comparator in the power circuit, controls and switches the internal and external power in advance for the monitoring of the external power, adopts safe and reliable basic components such as the comparator, the resistor, the triode, the MOS tube and the like in the circuit, reduces the design cost for users, and provides convenience and stability. When the power circuit is used for designing a microcomputer system product, the effect of stable switching of the internal power supply and the external power supply can be achieved, the circuit is beneficial to ensuring the stability of the microcomputer system, the practicability is high, and the consequences that the microcomputer system is reset, raised in voltage and the like to damage the microcomputer system caused by switching of the internal power supply and the external power supply are effectively avoided.
Drawings
Fig. 1 is a schematic diagram of a control circuit for smoothly switching internal and external power supplies according to the present invention.
The figures are numbered: the power supply circuit comprises a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R4, a fifth voltage-dividing resistor R5, a sixth current-limiting resistor R6, a seventh current-limiting resistor R7, an eighth current-limiting resistor R8, a ninth current-limiting resistor R9, a DC-DC module U1, a comparator U1A, an NPN triode Q1, a P-channel low-voltage MOS field-effect transistor Q2, an internal power lithium battery VBAT and an external power supply VCC.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.
The embodiment provides a steady power supply switching control circuit for a satellite communication chip, which aims at the occasion that a special chip is applied to switching of internal and external power supplies, realizes monitoring of an external power supply by a comparator in the power supply circuit at first, controls the switching of the internal and external power supplies in advance for monitoring of the external power supply, adopts basic components such as a safe and reliable comparator, a resistor, a triode, an MOS (metal oxide semiconductor) tube and the like in the circuit, reduces the design cost, and provides convenience and stability. The specific technical scheme is as follows: this steady power supply switches control circuit includes: a power supply including an external power supply and an internal power supply; the voltage detection unit is communicated with the power supply, detects a voltage value passing through the voltage detection unit and compares the voltage value with a preset value; the P-channel low-voltage MOS field effect transistor is electrically connected with the voltage detection unit; and the switching unit is electrically connected with the voltage detection unit and drives the P-channel low-voltage MOS field effect transistor to be switched on or switched off.
The method specifically comprises the following steps: the power supply circuit comprises a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R4, a fifth voltage-dividing resistor R5, a sixth current-limiting resistor R6, a seventh current-limiting resistor R7, an eighth current-limiting resistor R8, a ninth current-limiting resistor R9, a DC-DC module U1, a comparator U1A, an NPN triode Q1, a P-channel low-voltage MOS field-effect transistor Q2, an internal power lithium battery VBAT and an external power supply VCC.
The positive electrode of an external power supply VCC is connected to the input end of the DC-DC module U1, and is connected in series with a first voltage dividing resistor R1, a second voltage dividing resistor R2 and a third voltage dividing resistor R3 to divide the voltage to the ground. The connection point of the second voltage-dividing resistor R2 and the third voltage-dividing resistor R3 is connected to the inverting input end of the comparator U1A.
The DC-DC module outputs power to the comparator U1A, and is connected in series with a fourth voltage-dividing resistor R4 and a fifth voltage-dividing resistor R5 to divide voltage and ground. The connection point of the fourth voltage-dividing resistor R4 and the fifth voltage-dividing resistor R5 is connected with the non-inverting input end of the comparator U1A; the output end of the comparator U1A is connected in series with a sixth current limiting resistor R6 and a seventh current limiting resistor R7 to the ground, and the connection point of the sixth current limiting resistor R6 and the seventh current limiting resistor R7 is connected to the base of an NPN triode Q1. The output end Main-Vcc of the DC-DC power supply module is connected with the source electrode of a P-channel low-voltage MOS field effect transistor Q2, and is connected in series with an eighth current-limiting resistor R8 and a ninth current-limiting resistor R9 and is connected to the collector electrode of an NPN triode Q1, the connection point of the eighth current-limiting resistor R8 and the ninth current-limiting resistor R9 is connected with the grid electrode of the P-channel low-voltage MOS field effect transistor Q2, and the emitter electrode of the NPN triode Q1 is grounded; the drain electrode of the P-channel low-voltage MOS field effect transistor Q2 is connected with the anode of the internal power lithium battery VBAT. And the negative electrode of the external power supply VCC is grounded with the DC-DC module, the comparator U1A, the internal power supply lithium battery VBAT and other components.
When the external power supply is stable, the switching unit controls the P-channel low-voltage MOS field effect transistor Q2 to be closed, the power circuit is powered by the external power supply, when the driving circuit detects that the voltage of the external power supply is powered down to a certain voltage, the driving circuit rapidly controls the P-channel low-voltage MOS field effect transistor Q2 to be switched on, and the power circuit is powered by the internal standby power supply to realize the stable switching of the external power supply to the internal power supply. On the contrary, when the power supply of the internal power supply is stable, the external power supply is detected to be connected, the driving circuit controls the P-channel low-voltage MOS field effect transistor Q2 to be closed again, and the power supply circuit is switched from the internal power supply to the external power supply for supplying power. The circuit is applied to the design of a power supply circuit of a product, so that an internal power supply and an external power supply are switched more stably, and a microcomputer system can work more stably and reliably.
Building a circuit as shown in fig. 1, selecting a power supply module with a working power supply range of 9-100V for U1, selecting a main power supply of a microcomputer system with a U1 output port voltage of 4.2V, and selecting electronic components with appropriate parameters for other components; when the voltage of an external direct current power supply VCC is high voltage, the DC-DC module works normally, the voltage control at a voltage division connection point a of R2 and R3 is controlled to be higher than the voltage control at a voltage division connection point b of R4 and R5, the output end c of the comparator outputs low level, the triode Q1 is closed, the Q2Pmos tube is also closed, and the microcomputer system is powered by the external power supply; when the voltage of the external direct-current power supply VCC is reduced to about 16V, at the moment, U1 works normally, the output voltage of the 4.2V main power supply is stable, the voltage at the voltage division connecting point b at the R4 and the R5 is still stable, the voltage at the connecting point a of the external power supply voltage division resistors R2 and R3 is controlled to be slightly higher than the voltage at the point b, and the voltage at the point c still outputs low level; when the external power supply continues to be reduced to be lower than 16V and the voltage at the position a is lower than the voltage at the position b, the output end point c of the comparator outputs high level, the triode Q1 is conducted, the Q2Pmos tube is also conducted, the standby internal power supply supplies power to the main power supply, in conclusion, when the power supply circuit detects that the voltage of the external power supply is reduced to a dangerous value, the control circuit is opened in advance, the internal standby power supply is used for supplying power to the main system, and the process that the main power supply of the microcomputer system is stably switched from the external power supply to the internal power supply is realized; on the contrary, when the power circuit Q2 is turned on and the power supply of the internal power supply is stable, the external power supply is connected, when the external power supply rises to above 16V, the voltage at the position a is higher than the voltage at the position b again, the output end c of the comparator outputs low level again, the transistor Q1 is turned off, the transistor Q2Pmos is turned off, and at the moment, the main power supply of the microcomputer system is smoothly switched from the internal power supply to the external power supply.
Therefore, when the power circuit is used in a microcomputer system product, the effect of stable switching of the internal power supply and the external power supply can be achieved, the circuit is beneficial to ensuring the stability of the microcomputer system, the practicability is strong, and the consequences that the microcomputer system is reset, the voltage is raised and the like to damage the microcomputer system caused by switching of the internal power supply and the external power supply are effectively avoided.
In conclusion, compared with the prior art, the utility model has the following remarkable effects:
the comparator compares the voltage of the internal power supply and the voltage of the external power supply so as to stably switch the power supply control circuit, and a simpler and more convenient control mode is realized. The power supply is provided for a satellite communication chip system, and when the power supply circuit is applied to the design of a product power supply circuit, the internal power supply and the external power supply are switched more stably, so that a microcomputer system can work more stably and reliably.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (6)
1. A steady power supply switching control circuit for a satellite communication chip is characterized by comprising:
a power supply including an external power supply and an internal power supply;
the voltage detection unit is communicated with the power supply, detects a voltage value passing through the voltage detection unit and compares the voltage value with a preset value;
the P-channel low-voltage MOS field effect transistor is electrically connected with the voltage detection unit;
and the switching unit is electrically connected with the voltage detection unit and drives the P-channel low-voltage MOS field effect transistor to be switched on or switched off.
2. The stationary power switching control circuit for a satellite communication chip as recited in claim 1, wherein: the positive electrode of the external power supply is connected to the input end of the DC-DC module, and is connected in series with a divider resistor to be grounded;
the DC-DC module outputs a power supply to supply power to the comparator power supply, and is connected in series with a fourth voltage-dividing resistor and a fifth voltage-dividing resistor to divide voltage to ground; and the connection point of the fourth voltage-dividing resistor and the fifth voltage-dividing resistor is connected with the positive phase input end of the comparator.
3. The stationary power supply switching control circuit for a satellite communication chip as recited in claim 1, wherein said voltage detection unit further comprises:
and the comparator monitors the external power supply in cooperation with the current-limiting resistor and the voltage-dividing resistor, and the inverting input end of the comparator is connected with the connection point of the second voltage-dividing resistor and the third voltage-dividing resistor.
4. The stationary power supply switching control circuit for a satellite communication chip as recited in claim 1, wherein said switching unit further comprises:
the NPN triode is electrically connected with the current-limiting resistor and grounded to control the P-channel low-voltage MOS field effect transistor to be switched on or switched off;
the P-channel low-voltage MOS field effect transistor is electrically connected with the current-limiting resistor and the internal power lithium battery VBAT, and the conduction condition of the internal power supply is controlled according to the input condition of the external power supply.
5. The stationary power switching control circuit for a satellite communication chip as recited in claim 3, wherein: the output end of the comparator is connected in series with a sixth current-limiting resistor and a seventh current-limiting resistor to the ground, and the connection point of the sixth current-limiting resistor and the seventh current-limiting resistor is connected to the base of the NPN triode;
the output end of the DC-DC power supply module is connected with the source electrode of the P-channel low-voltage MOS field effect transistor, an eighth current-limiting resistor and a ninth current-limiting resistor are connected in series and are connected to the collector electrode of the NPN triode, the connection point of the eighth current-limiting resistor and the ninth current-limiting resistor is connected with the grid electrode of the P-channel low-voltage MOS field effect transistor, and the emitting electrode of the triode Q1 is grounded; the drain electrode of the P-channel low-voltage MOS field effect transistor is connected with the anode of the internal power lithium battery VBAT.
6. The stationary power switching control circuit for a satellite communication chip as recited in claim 1, wherein: and the negative electrode of the external power supply is grounded with the DC-DC module, the comparator and the VBAT component of the lithium battery with the internal power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121663020.9U CN215990303U (en) | 2021-07-21 | 2021-07-21 | Stable power supply switching control circuit for satellite communication chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121663020.9U CN215990303U (en) | 2021-07-21 | 2021-07-21 | Stable power supply switching control circuit for satellite communication chip |
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| Publication Number | Publication Date |
|---|---|
| CN215990303U true CN215990303U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121663020.9U Active CN215990303U (en) | 2021-07-21 | 2021-07-21 | Stable power supply switching control circuit for satellite communication chip |
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| CN (1) | CN215990303U (en) |
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2021
- 2021-07-21 CN CN202121663020.9U patent/CN215990303U/en active Active
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