CN208739028U - A kind of circuit of control negative pressure output - Google Patents
A kind of circuit of control negative pressure output Download PDFInfo
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- CN208739028U CN208739028U CN201821199032.9U CN201821199032U CN208739028U CN 208739028 U CN208739028 U CN 208739028U CN 201821199032 U CN201821199032 U CN 201821199032U CN 208739028 U CN208739028 U CN 208739028U
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Abstract
The utility model discloses a kind of circuits of control negative pressure output, which includes charging circuit and discharge circuit, and charging circuit includes first capacitor, the second diode and controllable switch device；Controllable switch device charges to first capacitor for controlling external voltage source when on state at which, and charging circuit is made to obtain positive voltage；Second diode charges to discharge circuit for controlling first capacitor；Discharge circuit is used to the positive voltage of charging circuit being converted to negative voltage, and negative voltage is supplied to electronic equipment；Also, when controllable switch device is in not on-state, charging circuit is in an off state.Implement the utility model, whether can need to provide conducting and disconnection that negative voltage electron equipment automatically controls charging circuit according to discharge circuit, to realize the independent output of each circuit voltage, does not interfere with each other, and circuit is simple, it is easy to accomplish.
Description
Technical field
The utility model relates to voltage source switch technology field more particularly to a kind of circuits of control negative pressure output.
Background technique
Negative pressure circuit is generally used for providing negative voltage for electronic equipment, such as: liquid crystal display.External voltage is usually
Positive voltage, external positive voltage is converted to negative voltage by negative pressure circuit, and is supplied to electronic equipment.
Electronic equipment is generally made of multiple hardware, and each hardware has corresponding circuit to carry out the normal work of drive electronics
Make, so the corresponding circuit of each hardware has the input and output of corresponding voltage.According to the difference of hardware feature, it may be necessary to
Positive voltage, it is also possible to need negative voltage, and electronic equipment often only one external voltage source, so needing external voltage source
Positive voltage be converted to negative voltage.
However, negative pressure circuit in the prior art produces and exports, especially output not with the output of other circuits
It is independent to separate, cause to generate interference between circuit.
Utility model content
In view of this, the problem to be solved by the utility model is to provide a kind of circuit of control negative pressure output, Ke Yi
In the case where less element, solving its negative pressure of negative pressure circuit because in the prior art cannot independently export with other circuit voltages
Cause the problem of interfering with each other between circuit.
In order to solve the above-mentioned technical problem, the utility model provides a kind of circuit of control negative pressure output, which includes
Charging circuit and discharge circuit, the charging circuit include first capacitor, the second diode and controllable switch device, in which:
First end of the one end of the first capacitor respectively with positive, the described discharge circuit of second diode is electrically connected
It connects, the cathode of second diode is electrically connected with one end of the controllable switch device, and the output end of the discharge circuit is used
Need the electronic equipment of negative voltage in electrical connection, the other end of the first capacitor for being electrically connected external voltage source, it is described can
The other end of control switching device is electrically connected the second end of the discharge circuit and for being grounded；
The controllable switch device, for controlling the external voltage source when on state at which to first electricity
Capacity charge makes the charging circuit obtain positive voltage；Second diode, for controlling the first capacitor to the electric discharge
Circuit charging；The discharge circuit, for the positive voltage of the charging circuit to be converted to negative voltage, and by the negative electricity
Pressure is supplied to the electronic equipment；
Wherein, when the controllable switch device is in not on-state, the charging circuit is in an off state.
As an alternative embodiment, the controllable switch device includes MOS in the utility model embodiment
Pipe, control signal L, in which:
The drain electrode of the metal-oxide-semiconductor is electrically connected with the cathode of second diode, the grid of the metal-oxide-semiconductor and the control
Signal L electrical connection, the source electrode of the metal-oxide-semiconductor are electrically connected with the second end of the discharge circuit.
As an alternative embodiment, the discharge circuit includes the one or two pole in the utility model embodiment
Pipe and the second capacitor, in which:
The cathode of the first diode is electrically connected with the anode of one end of the first capacitor, second diode,
The anode of the first diode is electrically connected with one end of second capacitor, and the other end of second capacitor is used to be grounded,
One end of second capacitor is for being electrically connected the electronic equipment.
As an alternative embodiment, in the utility model embodiment, when the electricity of external voltage source output
When pressure is high level, the high level is by second diode, the metal-oxide-semiconductor, the control signal L to first electricity
Capacity charge；When the voltage of external voltage source output is low level, the first capacitor passes through the metal-oxide-semiconductor, the control
Signal L processed, second diode, the first diode discharge to second capacitor.
As an alternative embodiment, in the utility model embodiment, when the electricity of external voltage source output
It is pressed in second diode, the metal-oxide-semiconductor and the control when constantly converting between the high level and the low level
Signal L controls the first capacitor to second capacitor charge and discharge, and stable negative voltage is provided for the electronic equipment.
As an alternative embodiment, further including driving circuit in the utility model embodiment, in which:
The output end of the driving circuit is electrically connected with the other end of the first capacitor, the input terminal of the driving circuit
For being electrically connected with the external voltage source.
As an alternative embodiment, further including BUCK circuit in the utility model embodiment, in which:
The output end of the BUCK circuit is electrically connected with the other end of the first capacitor, the other end of the BUCK circuit
For being grounded.
Implement the utility model embodiment, has the following beneficial effects:
The utility model provides a kind of circuit of control negative pressure output, which includes charging circuit and discharge circuit, is filled
Circuit includes first capacitor, the second diode and controllable switch device, and controllable switch device includes metal-oxide-semiconductor, control signal
L, discharge circuit include first diode and the second capacitor；Controllable switch device is external for controlling when on state at which
Voltage source charges to first capacitor, and charging circuit is made to obtain positive voltage；Second diode is for controlling first capacitor to electric discharge electricity
Road charging；Discharge circuit is used to the positive voltage of charging circuit being converted to negative voltage, and negative voltage is supplied to electronic equipment；And
And when controllable switch device is in not on-state, charging circuit is in an off state.Implement the utility model, Ke Yigen
Whether need to provide the conducting and disconnection that negative voltage electron equipment automatically controls charging circuit according to discharge circuit, to realize each
Circuit voltage independently exports, and does not interfere with each other, and circuit is simple, it is easy to accomplish.
Detailed description of the invention
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the circuit of control negative pressure output disclosed in the utility model embodiment；
Fig. 2 is the structural schematic diagram of the circuit of the control negative pressure output of another kind disclosed in the utility model embodiment；
Fig. 3 is the structural schematic diagram of the circuit of another disclosed control negative pressure output of the utility model embodiment.
Specific embodiment
In order to better understand and implement, the following will be combined with the drawings in the embodiments of the present invention, to the utility model
Technical solution in embodiment is clearly and completely described, it is clear that described embodiment is only the utility model one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, is fallen within the protection scope of the utility model.
It should be noted that unless otherwise clearly defined and limited, the specification and claims of the utility model
And the term " electrical connection " in above-mentioned attached drawing shall be understood in a broad sense, for example, it may be fixed electrical connection, is also possible to detachable electricity
Connection, or be integrally electrically connected；It can be mechanical electrical connection, be also possible to electricity electrical connection or can mutually communicate；It can be straight
It connects connected, the connection inside two elements or the phase interaction of two elements can also be can be indirectly connected through an intermediary
With relationship.In addition, the specification and claims of the utility model and term " first " in above-mentioned attached drawing, " second " etc. are
For distinguishing different objects, it is not use to describe a particular order, term " includes " and " having " and their any deformations, meaning
Figure, which is to cover, non-exclusive includes.For the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term in the present invention.
Embodiment one
Referring to Fig. 1, Fig. 1 is a kind of structural representation of the circuit of control negative pressure output disclosed in the utility model embodiment
Figure for the positive voltage of input to be changed into the negative voltage of electronic equipment needs, and exports each circuit voltage independently, mutually not
Interference is applied to such as liquid crystal display (LCD, LED), computer (palm PC, tablet computer, desktop computer, portable computer
Deng), television set, smart phone (Android phone, iOS mobile phone etc.), smart phone, smartwatch, projector, camera with
And in the electronic equipments such as mobile internet device (Mobile Internet Devices, MID), the utility model embodiment is not
It limits.As shown in Figure 1, the circuit 100 of control negative pressure output includes charging circuit 101 and discharge circuit 102, charging circuit
101 include first capacitor C1, the second diode D2 and controllable switch device S, in which:
One end of first capacitor C1 is electrically connected with the first end of the anode of the second diode D2, discharge circuit 102 respectively, the
The cathode of two diode D2 is electrically connected with one end of controllable switch device S, and the output end of discharge circuit 102 is needed for being electrically connected
For the other end of the electronic equipment Q of negative voltage, first capacitor C1 for being electrically connected external voltage source I, controllable switch device S's is another
The second end of end electrical connection discharge circuit 102 simultaneously is used to be grounded G；
Controllable switch device S charges to first capacitor C1 for controlling external voltage source I when on state at which, makes
Charging circuit 101 obtains positive voltage；Second diode D2 charges to discharge circuit 102 for controlling first capacitor C1；Electric discharge electricity
Road 102 is used to the positive voltage of charging circuit 101 being converted to negative voltage, and negative voltage is supplied to electronic equipment Q；
Wherein, when controllable switch device S is in not on-state, charging circuit 101 is in an off state.
As an alternative embodiment, in the utility model embodiment, referring to Fig. 1, controllable switch device S packet
Include metal-oxide-semiconductor M, control signal L, in which:
The drain electrode d of the metal-oxide-semiconductor M is electrically connected with the cathode of the second diode D2, the grid g and control signal L of metal-oxide-semiconductor M
Electrical connection, the source electrode s of metal-oxide-semiconductor M are electrically connected with the second end of discharge circuit 102.
As an alternative embodiment, discharge circuit 102 includes first diode in the utility model embodiment
D1 and the second capacitor C2, in which:
The cathode of first diode D1 is electrically connected with the anode of one end of first capacitor C1, the second diode D2, and the one or two
The anode of pole pipe D1 is electrically connected with one end of the second capacitor C2, and the other end of the second capacitor C2 is used to be grounded G, the second capacitor C2's
One end is for being electrically connected electronic equipment Q.
The working principle of the circuit 100 of control negative pressure output in the utility model embodiment is as follows:
In the utility model embodiment, when the voltage of external voltage source I output is high level VDD, first diode D1
State in backward voltage, the second diode D2 are in the state of forward voltage, according to the one-way conduction characteristic of diode, this
When first diode D1 be in off state, the second diode D2 is in the conductive state, i.e. branch where first diode D1 is disconnected
It opens, the branch conducting where the second diode D2, electric current flows to the drain electrode d of metal-oxide-semiconductor M by the second diode D2, with electric current
Increase, generate drain-source voltage between the drain electrode d and source electrode s of metal-oxide-semiconductor M so that metal-oxide-semiconductor M work in variable resistance area at this point, control
The voltage of the grid g of signal L control metal-oxide-semiconductor M processed, when the voltage of the grid g of metal-oxide-semiconductor M is not less than the grid g and source electrode of metal-oxide-semiconductor M
When gate source voltage between s, metal-oxide-semiconductor M is connected under the action of drain-source voltage and gate source voltage, i.e. branch where metal-oxide-semiconductor M is same
Sample is in the conductive state, i.e. external voltage source I, first capacitor C1, the second diode D2, metal-oxide-semiconductor M and ground G constitute circuit, then high
Level VDD charges to first capacitor C1 by the second diode D2, metal-oxide-semiconductor M, control signal L, and the flow direction of electric current is external voltage
Source I high level VDD to first capacitor C1 is to the second diode D2 to metal-oxide-semiconductor M to ground G, the at this time left height of the potential of first capacitor C1
It is right low；
When the voltage of external voltage source I output is low level VSS, the potential right low left high at the both ends first capacitor C1, this
When, the second diode D2 and the second capacitor C2 are in parallel, and first diode D1 is in the state of forward voltage, the second diode
D2 is in the state of backward voltage, and similarly according to the one-way conduction characteristic of diode, first diode D1 is in the conductive state, the
Two diode D2 are in off state, i.e. branch conducting where first diode D1, branch where the second diode D2 disconnects, then
First capacitor C1 discharges to the second capacitor C2 by first diode D1, i.e. first capacitor C1 charges to the second capacitor C2, electric current
Flow direction be ground G to the second capacitor C2 to first diode D1 to first capacitor C1 to external voltage source I to low level VSS, this
When the second capacitor C2 potential under it is high low, i.e. the second capacitor C2 is with the potential of the one end being electrically connected electronic equipment Q than second
The other end that capacitor C2 is electrically connected with ground (potential zero) wants low, and stable negative voltage is provided for electronic equipment Q；
When the voltage of external voltage source I output constantly converts between high level VDD and low level VSS, the two or two pole
Pipe D2, metal-oxide-semiconductor M and control signal L control first capacitor C1 and the second continuous charge and discharge of capacitor C2, continue for electronic equipment Q
Negative voltage is provided.When the second capacitor C2 does not need to provide negative voltage electron equipment Q, the grid of control signal L control metal-oxide-semiconductor M
The gate source voltage of grid g and source electrode s of the pole g voltage less than metal-oxide-semiconductor M, metal-oxide-semiconductor M is in off state, the i.e. place metal-oxide-semiconductor M at this time
Branch is not turned on, at this point, high level VDD cannot fill first capacitor C1 by the second diode D2, metal-oxide-semiconductor M, control signal L
Electricity, first capacitor C1 cannot charge to the second capacitor C2, export without negative voltage, realize the independent output of each circuit voltage,
It does not interfere with each other.Simultaneously as metal-oxide-semiconductor M and control signal L connect in charging circuit 101 where first capacitor C1, as the second capacitor C2
When not needing to provide negative voltage electron equipment Q, metal-oxide-semiconductor M and control signal L are controlled where directly having cut off first capacitor C1
Charging circuit 101 reduces the loss of component in circuit, protects component.Wherein, metal-oxide-semiconductor M is that N links up enhanced metal-oxide-semiconductor；
Other electronic components that first diode D1 and the second diode D2 can be played the role of same one-way conduction replace,
Such as: metal-oxide-semiconductor etc.；First capacitor C1 and the second capacitor C2 can be played the role of other electronic components of same energy storage
Instead of；Other electronic components that metal-oxide-semiconductor M can be played the role of same switch control replace, such as: triode etc.；
External voltage source I can be played the role of providing the voltage source of same voltage or voltage source circuit replaces, such as: door oscillation
Circuit etc., is not construed as limiting in the utility model embodiment.As it can be seen that implement the utility model embodiment, it can be according to the second electricity
Hold whether C2 needs to provide the conducting and disconnection of negative voltage electron equipment automatic control circuit, to realize that each circuit voltage is only
Vertical output, does not interfere with each other, reduces the loss of component, and circuit is simple, it is easy to accomplish.
Embodiment two
It is further preferred that referring to Fig. 2, Fig. 2 is the control negative pressure output of another kind disclosed in the utility model embodiment
Circuit structural schematic diagram.For the positive voltage of input to be changed into the negative voltage of electronic equipment needs, and make each circuit
Voltage independently exports, and does not interfere with each other, while increasing the load capacity of negative voltage regulator circuit, be applied to as liquid crystal display (LCD,
LED etc.), computer (palm PC, tablet computer, desktop computer, portable computer etc.), television set, smart phone (Android
Mobile phone, iOS mobile phone etc.), smart phone, smartwatch, projector, camera and mobile internet device (Mobile
Internet Devices, MID) etc. in electronic equipments, the utility model embodiment is without limitation.As shown in Fig. 2, in Fig. 1 institute
In the structure basis of the circuit for the control negative pressure output shown, the circuit 100 of control negative pressure output can also include driving circuit
103, the electrical connection between the charging circuit 101 and discharge circuit 102 of the circuit 100 of control negative pressure output please refers to implementation
The explanation of example a pair of Fig. 1, details are not described herein.One end of first capacitor C1 and the emitter e of triode V1, the hair of triode V2
Emitter-base bandgap grading e electrical connection, the current collection grade c of triode V2 is for G electrically, the transmitting of the emitting stage e and triode V2 of triode V1
Pole e electrical connection, the collector c of triode V1 is for being electrically connected external voltage source I, and one end of second resistance R2 is with triode V1's
Base stage b electrical connection, the other end of second resistance R2 are electrically connected with one end of one end of first resistor R1, third capacitor C3 respectively,
One end of 4th resistance R4 is electrically connected with the base stage b of triode V2, and the other end of the 4th resistance R4 is respectively with 3rd resistor R3's
One end, the 4th capacitor C4 one end electrical connection, pulse-modulator PWM respectively with the other end of first resistor R1,3rd resistor R3
The other end, the other end of third capacitor C3, the 4th capacitor C4 other end electrical connection.Wherein, triode V2 is three pole of positive-negative-positive
Pipe, working condition are common collector, and triode V1 is NPN type triode, and working condition is cascode grade.Wherein, described in Fig. 2
The working principle for controlling the circuit 100 of negative pressure output is specific as follows:
In the utility model embodiment, when external voltage source I and pulse-modulator PWM is high level VDD, high level
Triode V1 is connected by first resistor R1, second resistance R2 in VDD, triode V2 cut-off, at this point, pulse-modulator PWM is logical
The high level VDD for crossing the collector c external voltage source I of first resistor R1, second resistance R2, third capacitor C3 and triode V1 is logical
Emitting stage e and collector c (ce knot), first capacitor C1, the second diode D2 for crossing triode V1 fill first capacitor C1
Electricity, charging process please refer to embodiment one, and details are not described herein；When external voltage source I and pulse-modulator PWM are low level
When VSS, low level VSS ends triode V2 conducting, triode V1 by 3rd resistor R3, the 4th resistance R4, at this point, due to
The level of one end that first capacitor C1 is connect with the emitter e of triode V1 and triode V2 is low level VSS, so the first electricity
Hold C1 to discharge to the second capacitor C2 by first diode D1, i.e. first capacitor C1 charges to the second capacitor C2, discharges
Journey please refers to embodiment one, and details are not described herein；When the voltage of external voltage source I output and the voltage of pulse-modulator PWM exist
When constantly converting between high level VDD and low level VSS, the second diode D2, metal-oxide-semiconductor M, control signal L control first capacitor
C1 and the second capacitor C2 charge and discharge, stable negative voltage is provided for electronic equipment Q.When the second capacitor C2 does not need to provide negative voltage
When electron equipment Q, the grid source electricity of grid g and source electrode s of the grid g voltage less than metal-oxide-semiconductor M of control signal L control metal-oxide-semiconductor M
Pressure, metal-oxide-semiconductor M is in off state at this time, i.e. branch where metal-oxide-semiconductor M is not turned on, at this point, high level VDD cannot pass through the two or two
Pole pipe D2, metal-oxide-semiconductor M, control signal L charge to first capacitor C1, and first capacitor C1 cannot charge to the second capacitor C2, not bear
Voltage output is realized the independent output of each circuit voltage, is not interfere with each other.Simultaneously as metal-oxide-semiconductor M and control signal L connect first
Charging circuit 101 where capacitor C1, when the second capacitor C2 does not need to provide negative voltage electron equipment Q, metal-oxide-semiconductor M and control
The charging circuit 101 where first capacitor C1 is directly cut off in signal L control, reduces the loss of component in circuit, protects first device
Part.Wherein, metal-oxide-semiconductor M is that N links up enhanced metal-oxide-semiconductor；First diode D1 and the second diode D2 can be played on an equal basis
Other electronic components of one-way conduction effect replace, such as: metal-oxide-semiconductor etc.；First capacitor C1 and the second capacitor C2 can be by energy
The other electronic components for enough playing the role of same energy storage replace；Metal-oxide-semiconductor M can be played the other of same on-off action
Electronic component replaces, such as: triode etc.；External voltage source I can be played the role of providing the voltage of same voltage
Source or voltage source circuit replace, such as: door oscillating circuit etc. is not construed as limiting in the utility model embodiment.As it can be seen that implementing this
Whether utility model embodiment can need to provide leading for negative voltage electron equipment automatic control circuit according to the second capacitor C2
Through and off are opened, to realize that each circuit voltage independently exports, are not interfere with each other, while by increasing driving circuit, so that control is negative
It presses the load capacity of the circuit of output to be reinforced, improves the transfer efficiency and reliability of the circuit of control negative pressure output,
The loss of component is reduced, and circuit is simple, it is easy to accomplish.
Embodiment three
It is further preferred that referring to Fig. 3, Fig. 3 is another disclosed control negative pressure output of the utility model embodiment
Circuit structural schematic diagram.For the positive voltage of input to be changed into the negative voltage of electronic equipment needs, and each circuit voltage
Independent output synchronizes rectification to the circuit 100 of control negative pressure output while not interfereing with each other, is applied to such as liquid crystal display
(LCD, LED etc.), computer (palm PC, tablet computer, desktop computer, portable computer etc.), television set, smart phone
(Android phone, iOS mobile phone etc.), smart phone, smartwatch, projector, camera and mobile internet device
In electronic equipments such as (Mobile Internet Devices, MID), the utility model embodiment is without limitation.As shown in figure 3,
In the structure basis of the circuit of control negative pressure output shown in Fig. 1, the circuit 100 of control negative pressure output can also include BUCK
Circuit 104, the electrical connection between the charging circuit 101 and discharge circuit 102 of the circuit 100 of control negative pressure output please refer to
The explanation of embodiment a pair of Fig. 1, details are not described herein.The drain electrode d's and metal-oxide-semiconductor Q2 of one end and metal-oxide-semiconductor Q1 of first capacitor C1
Source electrode s electrical connection, the source electrode s of metal-oxide-semiconductor Q1 is for being grounded, and the grid g of metal-oxide-semiconductor Q1 is electrically connected with pulse-modulator PWM, metal-oxide-semiconductor
The drain electrode d of Q2 is for being electrically connected external voltage source I, and the grid g of metal-oxide-semiconductor Q2 is electrically connected with pulse-modulator PWM, wherein metal-oxide-semiconductor
Q1 and metal-oxide-semiconductor Q2 is the enhanced metal-oxide-semiconductor of N-channel, and pulse-modulator PWM carries out reverse phase control to Q1 and Q2.Wherein, Fig. 3 institute
The working principle of the circuit 100 of the control negative pressure output of description is specific as follows:
In the utility model embodiment, when external voltage source I is high level VDD, pulse-modulator PWM controls metal-oxide-semiconductor
Q2 conducting, metal-oxide-semiconductor Q1 cut-off, the source electrode s of metal-oxide-semiconductor Q2 obtain a high level VDD and are supplied to first capacitor C1, high level VDD
It is charged by the second diode D2, metal-oxide-semiconductor M, control signal L to first capacitor C1, charging process please refers to embodiment one, herein
It repeats no more；When external voltage source I is low level VSS, pulse-modulator PWM controls metal-oxide-semiconductor Q1 conducting, and metal-oxide-semiconductor Q2 ends,
The drain electrode d of metal-oxide-semiconductor Q1 obtains a low level VSS and is supplied to first capacitor C1, due to the left height of potential of first capacitor C1 at this time
Right low, then first capacitor C1 discharges to the second capacitor C2 by first diode D1, i.e. first capacitor C1 fills the second capacitor C2
Electricity, discharge process please refer to embodiment one, and details are not described herein；When external voltage source I output voltage high level VDD with it is low
When constantly being converted between level VSS, pulse-modulator PWM by inverting function, change timing duty ratio control metal-oxide-semiconductor Q1 and
The conducting and disconnection of metal-oxide-semiconductor Q2 is realized subsequent so that providing a high-low voltage after over commutation gives first capacitor C1
Charge and discharge and negative pressure output.Wherein, metal-oxide-semiconductor M is that N links up enhanced metal-oxide-semiconductor；First diode D1 and the second diode D2 can be with
The other electronic components that can be played the role of same one-way conduction replace, such as: metal-oxide-semiconductor etc.；First capacitor C1 and second
Other electronic components that capacitor C2 can be played the role of same energy storage replace；Metal-oxide-semiconductor M can be played on an equal basis
Other electronic components of on-off action replace, such as: triode etc.；It is same that external voltage source I can be played offer
The voltage source or voltage source circuit of voltage effect replace, such as: door oscillating circuit etc. does not limit in the utility model embodiment
It is fixed.As it can be seen that implementing the utility model embodiment, whether can be needed to provide negative voltage electron equipment according to the second capacitor automatic
The conducting and disconnection of control circuit are not interfere with each other, while passing through pulse-modulator to realize that each circuit voltage independently exports
The duty ratio of PWM carrys out the circuit of synchronous rectification control negative pressure output, and circuit is simple, it is easy to accomplish.
The circuit of the control negative pressure output in a kind of electronic equipment disclosed in the utility model embodiment is carried out above
It is discussed in detail, specific embodiment used herein is expounded the principles of the present invention and embodiment, but above-mentioned
Preferred embodiment not to limit the utility model, the above embodiments are only used to help understand the utility model
Method and its core concept；At the same time, for those skilled in the art is not departing from based on the idea of the present invention
In the spirit and scope of the utility model, there will be changes in the specific implementation manner and application range, therefore this is practical
The range that novel protection scope is defined with claim.
Claims (7)
1. it is a kind of control negative pressure output circuit, which is characterized in that it is described control negative pressure output circuit include charging circuit and
Discharge circuit, the charging circuit include first capacitor, the second diode and controllable switch device, in which:
One end of the first capacitor is electrically connected with the first end of positive, the described discharge circuit of second diode respectively,
The cathode of second diode is electrically connected with one end of the controllable switch device, and the output end of the discharge circuit is for electricity
Connection needs the electronic equipment of negative voltage, and the other end of the first capacitor is described controllably to open for being electrically connected external voltage source
The other end for closing device is electrically connected the second end of the discharge circuit and for being grounded；
The controllable switch device fills the first capacitor for controlling the external voltage source when on state at which
Electricity makes the charging circuit obtain positive voltage；Second diode, for controlling the first capacitor to the discharge circuit
Charging；The discharge circuit for the positive voltage of the charging circuit to be converted to negative voltage, and the negative voltage is mentioned
Supply the electronic equipment；
Wherein, when the controllable switch device is in not on-state, the charging circuit is in an off state.
2. the circuit of control negative pressure output according to claim 1, which is characterized in that the controllable switch device includes
Metal-oxide-semiconductor, control signal L, in which:
The drain electrode of the metal-oxide-semiconductor is electrically connected with the cathode of second diode, the grid of the metal-oxide-semiconductor and the control signal
L electrical connection, the source electrode of the metal-oxide-semiconductor are electrically connected with the second end of the discharge circuit.
3. the circuit of control negative pressure output according to claim 2, which is characterized in that the discharge circuit includes the one or two
Pole pipe and the second capacitor, in which:
The cathode of the first diode is electrically connected with the anode of one end of the first capacitor, second diode, described
The anode of first diode is electrically connected with one end of second capacitor, and the other end of second capacitor is described for being grounded
One end of second capacitor is for being electrically connected the electronic equipment.
4. the circuit of control negative pressure output according to claim 3, which is characterized in that when external voltage source output
When voltage is high level, the high level is by second diode, the metal-oxide-semiconductor, the control signal L to described first
Capacitor charging；When the voltage of external voltage source output is low level, the first capacitor passes through the metal-oxide-semiconductor, described
Control signal L, second diode, the first diode discharge to second capacitor.
5. the circuit of control negative pressure output according to claim 4, which is characterized in that when external voltage source output
When voltage constantly converts between the high level and the low level, second diode, the metal-oxide-semiconductor and the control
Signal L processed controls the first capacitor to second capacitor charge and discharge, and stable negative voltage is provided for the electronic equipment.
6. the circuit of control negative pressure output according to claim 1, which is characterized in that further include driving circuit, in which:
The output end of the driving circuit is electrically connected with the other end of the first capacitor, and the input terminal of the driving circuit is used for
It is electrically connected with the external voltage source.
7. the circuit of control negative pressure output according to claim 1, which is characterized in that further include BUCK circuit, in which:
The output end of the BUCK circuit is electrically connected with the other end of the first capacitor, and the other end of the BUCK circuit is used for
Ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821199032.9U CN208739028U (en) | 2018-07-26 | 2018-07-26 | A kind of circuit of control negative pressure output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821199032.9U CN208739028U (en) | 2018-07-26 | 2018-07-26 | A kind of circuit of control negative pressure output |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113394969A (en) * | 2020-12-22 | 2021-09-14 | 青岛鼎信通讯股份有限公司 | Negative voltage generation circuit applied to acquisition terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113394969A (en) * | 2020-12-22 | 2021-09-14 | 青岛鼎信通讯股份有限公司 | Negative voltage generation circuit applied to acquisition terminal |
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