CN213879628U - Power supply driving circuit and power supply - Google Patents
Power supply driving circuit and power supply Download PDFInfo
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- CN213879628U CN213879628U CN202022440538.8U CN202022440538U CN213879628U CN 213879628 U CN213879628 U CN 213879628U CN 202022440538 U CN202022440538 U CN 202022440538U CN 213879628 U CN213879628 U CN 213879628U
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Abstract
The utility model relates to a power technical field provides a power drive circuit and power, and this power drive circuit includes: an auxiliary power supply module; the switch module is connected with the auxiliary power supply module and the external equipment at the first end and grounded at the second end; and the switch control module is connected with the external power supply at the input end, is connected with the control end of the switch module at the output end, is configured to detect the voltage of the external power supply, controls the switch module to be switched on when the voltage of the external power supply is smaller than the preset voltage, and controls the switch module to be switched off when the voltage of the external power supply is larger than the preset voltage. The utility model provides a power drive circuit carries out "plastic" to external power supply voltage for each module of circuit can start simultaneously and close in the external equipment when upper and lower electricity, can not cause the circuit logic confusion, has improved the reliability of power.
Description
Technical Field
The utility model belongs to the technical field of the power, especially, relate to a power drive circuit and power.
Background
When the power supply equipment is powered on, the voltage does not directly reach the preset voltage value, but gradually increases to reach the preset voltage value. Meanwhile, due to the existence of energy storage elements such as capacitors in the power supply equipment, the voltage does not disappear immediately when the power supply is powered off, but slowly drops.
Because the starting voltages of different modules in the circuit are different, the power supply can cause the phenomenon that part of the circuit is started and part of the circuit is not started when the power supply is powered on and powered off, so that the logic of the circuit is disordered, and equipment can be damaged when the logic is serious.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a power driving circuit and a power supply, so as to solve the problem that the slow change of the power voltage causes the confusion of the circuit logic when the device is powered on and powered off in the prior art, and the device is damaged when the device is serious.
The embodiment of the utility model provides a first aspect provides a power driving circuit, include:
an auxiliary power supply module;
the switch module is connected with the auxiliary power supply module and the external equipment at the first end and grounded at the second end; and
the input end is connected with an external power supply, the output end is connected with the control end of the switch module and is configured to detect the voltage of the external power supply, the switch module is controlled to be switched on when the voltage of the external power supply is smaller than a preset voltage, and the switch control module is controlled to be switched off when the voltage of the external power supply is larger than the preset voltage.
Optionally, the switch control module includes:
a switch power supply unit;
the first end of the switch unit is connected with the output end of the switch power supply unit and the output end of the switch control module respectively, and the second end of the switch unit is grounded; and
the input end of the power supply detection unit is connected with the input end of the switch control module, the output end of the power supply detection unit is connected with the control end of the switch unit, and the power supply detection unit is configured to detect the voltage of the external power supply and control the on-off of the switch unit according to the voltage of the external power supply.
Optionally, the power detection unit includes: the power supply detection circuit comprises a power supply detection chip, a first voltage stabilizing diode, a first resistor, a second resistor, a third resistor and a first capacitor;
the input end of the power supply detection chip is connected with the input end of the power supply detection unit, the output end of the power supply detection chip is respectively connected with the first end of the first capacitor, the first end of the second resistor and the output end of the power supply detection unit through the first resistor, and the grounding end of the power supply detection chip is grounded;
the second end of the second resistor is respectively connected with the first end of the third resistor and the anode of the first voltage-stabilizing diode;
the cathode of the first voltage stabilizing diode is connected with an external power supply;
the second end of the first capacitor and the second end of the third resistor are both grounded.
Optionally, the switch unit includes: the first switch tube, the fourth resistor and the fifth resistor;
the first end of the first switch tube is connected with the first end of the switch unit, the second end of the first switch tube is connected with the second end of the switch unit, and the control end of the first switch tube is respectively connected with the first end of the fourth resistor and the first end of the fifth resistor;
the second end of the fourth resistor is connected with the control end of the switch unit;
the second end of the fifth resistor is grounded.
Optionally, the output terminal of the switching power supply unit includes: a first output terminal and a second output terminal; the first output end is connected with the first end of the switch unit, and the second output end is connected with the output end of the switch control module;
the switching power supply unit includes: the first diode, the second capacitor, the sixth resistor, the seventh resistor and the eighth resistor;
the anode of the first diode is connected with an external power supply, the first end of the sixth resistor and the first end of the seventh resistor respectively, and the cathode of the first diode is connected with the second end of the sixth resistor and the first end of the second capacitor respectively;
and the first end of the eighth resistor is respectively connected with the first output end and the second end of the seventh resistor, and the second end of the eighth resistor is respectively connected with the second output end and the second end of the second capacitor.
Optionally, the switch control module further includes: a voltage conditioning unit;
and the input end of the voltage conditioning unit is connected with the input end of the switch control module, and the output end of the voltage conditioning unit is connected with the input end of the power supply detection unit.
Optionally, the voltage conditioning unit includes: the second voltage stabilizing diode, the second diode, the third capacitor, the ninth resistor and the tenth resistor;
the anode of the second voltage stabilizing diode is grounded, and the cathode of the second voltage stabilizing diode is respectively connected with the first end of the ninth resistor, the first end of the tenth resistor, the first end of the third capacitor, the anode of the second diode and the output end of the voltage conditioning unit;
the second end of the tenth resistor is respectively connected with the cathode of the second diode and the input end of the voltage conditioning unit;
the second end of the ninth resistor and the second end of the third capacitor are both grounded.
Optionally, the switch module includes: the second switch tube, the fourth capacitor and the eleventh resistor;
the first end of the second switch tube is connected with the first end of the switch module, the second end of the second switch tube is connected with the second end of the switch module, and the control end of the second switch tube is respectively connected with the first end of the fourth capacitor, the first end of the eleventh resistor and the control end of the switch module;
the second end of the fourth capacitor and the second end of the eleventh resistor are both grounded.
Optionally, the second switch tube is an NMOS tube.
The embodiment of the utility model provides a second aspect provides a power supply, include the embodiment of the utility model provides an arbitrary kind power drive circuit in the first aspect.
The embodiment of the utility model provides a power driving circuit, include: an auxiliary power supply module; the switch module is connected with the auxiliary power supply module and the external equipment at the first end and grounded at the second end; and the switch control module is connected with the external power supply at the input end, is connected with the control end of the switch module at the output end, is configured to detect the voltage of the external power supply, controls the switch module to be switched on when the voltage of the external power supply is smaller than the preset voltage, and controls the switch module to be switched off when the voltage of the external power supply is larger than the preset voltage. The utility model discloses an in the embodiment through switch module control output voltage, carry out "plastic" to external power supply voltage for each module of circuit can start simultaneously and close in the external equipment when upper and lower electricity, can not cause the chaotic of circuit logic because of each circuit module activation time is inconsistent, has improved the reliability of power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a power driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a switch control module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a power driving circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Referring to fig. 1, an embodiment of the present invention provides a power driving circuit, including:
an auxiliary power supply module 11;
a switch module 12 with a first end connected with the auxiliary power supply module 11 and the external device, and a second end grounded; and
the input end is connected with external power source VCC, and the output is connected with switch module 12's control end, and is configured to the voltage that detects external power source VCC, controls switch module 12 and switches on when external power source VCC's voltage is less than and predetermines voltage, controls switch module 12 and switches off's switch control module 13 when external power source VCC's voltage is greater than and predetermines voltage.
In the embodiment of the present invention, the switch control module 13 detects the voltage of the external power VCC, and controls the switch module 12 to be turned on and output a low level if the voltage of the external power VCC is smaller than a preset voltage; if the voltage of the external power source VCC is greater than the preset voltage, the switch module 12 is turned off to output a high level. For example, when the external power source VCC is lower than the preset voltage, the switch module 12 is always turned on, and when the external power source VCC is higher than the preset voltage and the supply voltage of each part of the circuit in the external device is satisfied, the switch module 12 is turned off to output a high level, which can ensure the normal operation of the external device, and can not cause the phenomena of partial start of the circuit and logic disorder of the circuit. Similarly, when the power supply voltage is greater than the preset voltage, the switch module 12 is always turned off to output a high level, and when the voltage is less than the preset voltage and the external device cannot work normally, the switch module 12 is turned on to output a low level. The embodiment of the utility model provides an in provide a power drive circuit carries out "plastic" to external power source VCC voltage for each module of circuit can start simultaneously and close in the external equipment when upper and lower electricity, can not cause the circuit logic confusion, and this power drive circuit sets up in the power, has improved the reliability of power.
The preset voltage can be set according to the starting voltage of each module of the circuit in the external equipment, and each module of the circuit in the external equipment can be started normally when the voltage is preset.
In some embodiments, referring to fig. 2, the switch control module 13 may include:
a switching power supply unit 131;
a switch unit 132 having a first end connected to the output end of the switch power supply unit 131 and the output end of the switch control module 13, and a second end grounded; and
the input terminal is connected to the input terminal of the switch control module 13, and the output terminal is connected to the control terminal of the switch unit 132, and is configured to detect the voltage of the external power VCC, and control the power detection unit 133 to turn on or off the switch unit 132 according to the voltage of the external power VCC.
The embodiment of the utility model provides an in, power detecting element 133 detects external power source VCC voltage, provides control voltage for switch module 12 through switch element 132. For example, when the power detection unit 133 detects that the voltage of the external power VCC is greater than the preset voltage, the switch unit 132 is turned on, the control terminal of the switch module 12 is at a low level, the switch module 12 is turned off, and a high level is output; when the power detection unit 133 detects that the voltage of the external power VCC is less than the preset voltage, the switch unit 132 is turned off, the control terminal of the switch module 12 is at a high level, the switch module 12 is turned on, and a low level is output.
In some embodiments, referring to fig. 3, the power detection unit 133 may include: the power supply detection circuit comprises a power supply detection chip U1, a first voltage stabilizing diode ZD1, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1;
the input end (pin 3) of the power detection chip U1 is connected with the input end of the power detection unit 133, the output end (pin 2) is respectively connected with the first end of the first capacitor C1, the first end of the second resistor R2 and the output end of the power detection unit 133 through the first resistor R1, and the ground end (pin 1) is grounded;
a second end of the second resistor R2 is connected to a first end of the third resistor R3 and an anode of the first zener diode ZD1, respectively;
the cathode of the first zener diode ZD1 is connected to an external power source VCC;
the second terminal of the first capacitor C1 and the second terminal of the third resistor R3 are both grounded.
In some embodiments, the power detection chip U1 may be a microprocessor power monitor chip.
For example, the power detection chip U1 may be model SGM 803.
The first zener diode ZD1 is used for voltage reduction, and the second resistor R2, the third resistor R3 and the first capacitor C1 are used for adjusting the output voltage of the power detection chip U1, so that the output voltage of the power detection unit 133 meets the control voltage requirement of the switch unit 132.
In some embodiments, referring to fig. 3, the switching unit 132 includes: the first switch tube Q1, the fourth resistor R4 and the fifth resistor R5;
a first switch tube Q1, a first end of which is connected to the first end of the switch unit 132, a second end of which is connected to the second end of the switch unit 132, and a control end of which is connected to the first end of the fourth resistor R4 and the first end of the fifth resistor R5, respectively;
a second terminal of the fourth resistor R4 is connected to the control terminal of the switch unit 132;
the second terminal of the fifth resistor R5 is connected to ground.
In some embodiments, the first switch Q1 is an NPN transistor.
When the external power VCC is lower than the preset voltage, the power detection unit 133 outputs a low level, and the first switching tube Q1 is turned off, so that the switching control module 13 outputs a high level, and the switching module 12 outputs a low level; on the contrary, the first switch tube Q1 is turned on, the switch control module 13 outputs a low level, and the switch module 12 outputs a high level.
In some embodiments, referring to fig. 3, the output terminal of the switching power supply unit 131 includes: a first output terminal and a second output terminal; the first output end is connected with the first end of the switch unit 132, and the second output end is connected with the output end of the switch control module 13;
the switching power supply unit 131 includes: a first diode D1, a second capacitor C2, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;
a first diode D1 having an anode connected to the external power VCC, the first end of the sixth resistor R6, and the first end of the seventh resistor R7, and a cathode connected to the second end of the sixth resistor R6 and the first end of the second capacitor C2;
the eighth resistor R8 has a first end connected to the first output end and the second end of the seventh resistor R7, respectively, and a second end connected to the second output end and the second end of the second capacitor C2, respectively.
In some embodiments, referring to fig. 3, the switch module 12 includes: the second switch tube Q2, the fourth capacitor C4 and the eleventh resistor R11;
a second switch tube Q2, a first end of which is connected to the first end of the switch module 12, a second end of which is connected to the second end of the switch module 12, and a control end of which is connected to the first end of the fourth capacitor C4, the first end of the eleventh resistor R11, and the control end of the switch module 12, respectively;
the second terminal of the fourth capacitor C4 and the second terminal of the eleventh resistor R11 are both grounded.
In some embodiments, the second switch transistor Q2 is an NMOS transistor.
In some embodiments, the auxiliary power module 11 may be powered by an external power source VCC.
For example, when the switch power supply unit 131 is powered by a stable power supply, the auxiliary power supply module 11 may be powered by an external power source VCC or a stable power supply, and the on/off of the switch unit 132 is completely controlled by the external power source VCC, so that the voltage at the control terminal of the switch module 12 is a fixed high level or a fixed low level, thereby making the output of the power driving circuit be a fixed high level or a fixed low level. When the switch power supply unit 131 is powered by the external power source VCC, the auxiliary power supply module 11 is also powered by the external power source VCC. Since the voltage at the output terminal of the switching power supply unit 131 is also small when the external power VCC is small, and the voltage is not enough to drive the switching module 12 to turn on, the switching module 12 should be turned on or off, so that the output of the power driving circuit is determined by the auxiliary power supply module 11. If the auxiliary power supply module 11 is powered by the stable power supply at this time, the output level of the power driving circuit is high, and the logic is disordered. If the auxiliary power supply module 11 is also powered by the external power supply VCC, when the external power supply VCC is smaller, although the switch module 12 cannot be normally turned on at this time, since the auxiliary power supply module 11 is also powered by the external power supply VCC, the voltage is also very low, the output of the power supply driving circuit is still at a low level, and the circuit logic is normal.
Referring to fig. 3, in the embodiment of the present invention, since the switch power supply unit 131 is also powered by the external power VCC, when the voltage of the external power VCC is lower, the voltage of the second end of the eighth resistor R8 is not enough to open the second switch tube Q2, at this time, since the auxiliary power supply module 11 also has the external power VCC to supply power, the output voltage is low, and therefore, the circuit actually still outputs a low voltage, which meets the application requirement. As the voltage rises, when the voltage of the external power VCC rises to a certain value, the second switch Q2 is turned on, and the circuit still outputs a low level. The application requirement of the second switching tube Q2 is met by reasonably setting the parameters of each element in the switch power supply unit 131.
In some embodiments, referring to fig. 2, the switch control module 13 further includes: a voltage conditioning unit 134;
and an input end of the voltage conditioning unit 134 is connected with an input end of the switch control module 13, and an output end of the voltage conditioning unit 134 is connected with an input end of the power detection unit 133.
In some embodiments, referring to fig. 3, the voltage conditioning unit 134 comprises: a second zener diode ZD2, a second diode D2, a third capacitor C3, a ninth resistor R9, and a tenth resistor R10;
the anode of the second zener diode ZD2 is grounded, and the cathode of the second zener diode ZD2 is connected to the first end of the ninth resistor R9, the first end of the tenth resistor R10, the first end of the third capacitor C3, the anode of the second diode D2, and the output end of the voltage conditioning unit 134;
a second end of the tenth resistor R10 is connected to the cathode of the second diode D2 and the input end of the voltage conditioning unit 134, respectively;
the second terminal of the ninth resistor R9 and the second terminal of the third capacitor C3 are both grounded.
The voltage conditioning unit 134 is configured to condition the external power VCC, so that a value of the preset voltage matches a threshold voltage of the power detection chip U1. Wherein the second diode D2 is used to discharge capacitive charge.
Corresponding to any kind of power drive circuit of above-mentioned, the embodiment of the utility model provides a power is still provided, and this power includes any kind of power drive circuit of above-mentioned, and has the advantage that above-mentioned power drive circuit had, no longer explains herein.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A power supply driving circuit, comprising:
an auxiliary power supply module;
the switch module is connected with the auxiliary power supply module and the external equipment at a first end and grounded at a second end; and
the input end is connected with an external power supply, the output end is connected with the control end of the switch module, the switch module is configured to detect the voltage of the external power supply, the switch module is controlled to be switched on when the voltage of the external power supply is smaller than a preset voltage, and the switch control module is controlled to be switched off when the voltage of the external power supply is larger than the preset voltage.
2. The power supply drive circuit according to claim 1, wherein the switch control module includes:
a switch power supply unit;
the first end of the switch unit is connected with the output end of the switch power supply unit and the output end of the switch control module respectively, and the second end of the switch unit is grounded; and
the power supply detection unit is connected with the input end of the switch control module at the input end, is connected with the control end of the switch unit at the output end, is configured to detect the voltage of the external power supply, and controls the on-off of the switch unit according to the voltage of the external power supply.
3. The power supply drive circuit according to claim 2, wherein the power supply detection unit includes: the power supply detection circuit comprises a power supply detection chip, a first voltage stabilizing diode, a first resistor, a second resistor, a third resistor and a first capacitor;
the input end of the power supply detection chip is connected with the input end of the power supply detection unit, the output end of the power supply detection chip is respectively connected with the first end of the first capacitor, the first end of the second resistor and the output end of the power supply detection unit through the first resistor, and the grounding end of the power supply detection chip is grounded;
the second end of the second resistor is respectively connected with the first end of the third resistor and the anode of the first voltage stabilizing diode;
the cathode of the first voltage stabilizing diode is connected with the external power supply;
the second end of the first capacitor and the second end of the third resistor are both grounded.
4. The power supply drive circuit according to claim 2, wherein the switching unit includes: the first switch tube, the fourth resistor and the fifth resistor;
the first end of the first switch tube is connected with the first end of the switch unit, the second end of the first switch tube is connected with the second end of the switch unit, and the control end of the first switch tube is respectively connected with the first end of the fourth resistor and the first end of the fifth resistor;
the second end of the fourth resistor is connected with the control end of the switch unit;
and the second end of the fifth resistor is grounded.
5. The power supply drive circuit according to claim 2, wherein the output terminal of the switching power supply unit includes: a first output terminal and a second output terminal; the first output end is connected with the first end of the switch unit, and the second output end is connected with the output end of the switch control module;
the switching power supply unit includes: the first diode, the second capacitor, the sixth resistor, the seventh resistor and the eighth resistor;
an anode of the first diode is connected with the external power supply, the first end of the sixth resistor and the first end of the seventh resistor respectively, and a cathode of the first diode is connected with the second end of the sixth resistor and the first end of the second capacitor respectively;
and a first end of the eighth resistor is connected with the first output end and a second end of the seventh resistor respectively, and a second end of the eighth resistor is connected with the second output end and a second end of the second capacitor respectively.
6. The power supply drive circuit of claim 2, wherein the switch control module further comprises: a voltage conditioning unit;
and the input end of the voltage conditioning unit is connected with the input end of the switch control module, and the output end of the voltage conditioning unit is connected with the input end of the power supply detection unit.
7. The power supply drive circuit of claim 6 wherein the voltage conditioning unit comprises: the second voltage stabilizing diode, the second diode, the third capacitor, the ninth resistor and the tenth resistor;
the anode of the second voltage stabilizing diode is grounded, and the cathode of the second voltage stabilizing diode is respectively connected with the first end of the ninth resistor, the first end of the tenth resistor, the first end of the third capacitor, the anode of the second diode and the output end of the voltage conditioning unit;
a second end of the tenth resistor is connected with a cathode of the second diode and an input end of the voltage conditioning unit respectively;
and the second end of the ninth resistor and the second end of the third capacitor are both grounded.
8. The power supply drive circuit according to any one of claims 1 to 7, wherein the switch module includes: the second switch tube, the fourth capacitor and the eleventh resistor;
a first end of the second switch tube is connected with a first end of the switch module, a second end of the second switch tube is connected with a second end of the switch module, and a control end of the second switch tube is respectively connected with a first end of the fourth capacitor, a first end of the eleventh resistor and a control end of the switch module;
and the second end of the fourth capacitor and the second end of the eleventh resistor are both grounded.
9. The power driving circuit as claimed in claim 8, wherein the second switch transistor is an NMOS transistor.
10. A power supply comprising the power supply driving circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022440538.8U CN213879628U (en) | 2020-10-28 | 2020-10-28 | Power supply driving circuit and power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022440538.8U CN213879628U (en) | 2020-10-28 | 2020-10-28 | Power supply driving circuit and power supply |
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| CN213879628U true CN213879628U (en) | 2021-08-03 |
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| CN202022440538.8U Active CN213879628U (en) | 2020-10-28 | 2020-10-28 | Power supply driving circuit and power supply |
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| CN (1) | CN213879628U (en) |
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