CN106771488B - Negative high voltage abnormal detection circuit, device, control circuit and imaging device - Google Patents
Negative high voltage abnormal detection circuit, device, control circuit and imaging device Download PDFInfo
- Publication number
- CN106771488B CN106771488B CN201611197149.9A CN201611197149A CN106771488B CN 106771488 B CN106771488 B CN 106771488B CN 201611197149 A CN201611197149 A CN 201611197149A CN 106771488 B CN106771488 B CN 106771488B
- Authority
- CN
- China
- Prior art keywords
- high voltage
- unit
- voltage
- negative high
- pressure regulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Voltage And Current In General (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The embodiment of the invention provides a kind of negative high voltage abnormal detection circuit, device, control circuit and imaging devices, are related to negative high voltage detection technique field, realize through voltage value and detect the exception of negative high voltage output, make to detect more accurate.Negative high voltage abnormal detection circuit, comprising: negative high voltage test side；Partial pressure unit, input terminal are connected to the negative high voltage test side；Pressure regulation unit, input terminal are connected to the output end of the partial pressure unit, and the negative voltage transition that the pressure regulation unit is used to export the output end of the partial pressure unit is corresponding positive voltage；Detection unit, input terminal are connected to the output end of the pressure regulation unit, and the detection unit is used to judge according to the positive voltage value that the pressure regulation unit exports whether the output of the negative high voltage test side to be abnormal.
Description
[technical field]
The present invention relates to negative high voltage detection technique field more particularly to a kind of negative high voltage abnormal detection circuits, device, control
Circuit and imaging device.
[background technique]
The imaging devices such as laser printer generate negative high voltage usually using high voltage power supply, for imaging engine use.
In realizing process of the present invention, at least there are the following problems in the prior art for inventor's discovery:
The prior art judges whether the output of high voltage power supply is abnormal usually using the mode of current detecting, however, high pressure
The electric current very little of the negative high voltage output of power supply, is μ A rank, therefore can not accurately to detect negative high voltage defeated for current detection mode
Exception out.
[summary of the invention]
In view of this, the embodiment of the invention provides a kind of negative high voltage abnormal detection circuit, device, control circuit and imagings
Equipment realizes through voltage value and detects the exception of negative high voltage output, makes to detect more accurate.
On the one hand, the embodiment of the invention provides a kind of negative high voltage abnormal detection circuits, comprising:
Negative high voltage test side；
Partial pressure unit, input terminal are connected to the negative high voltage test side；
Pressure regulation unit, input terminal are connected to the output end of the partial pressure unit, and the pressure regulation unit is used for will be described point
The negative voltage transition for pressing the output end output of unit is corresponding positive voltage；
Detection unit, input terminal are connected to the output end of the pressure regulation unit, and the detection unit is used for according to
The positive voltage value of pressure regulation unit output judges whether the output of the negative high voltage test side is abnormal.
Specifically, the partial pressure unit includes:
The input terminal of first partial pressure device and the second partial pressure device, the partial pressure unit is connected by first partial pressure device
It is connected to the output end of the partial pressure unit；
The output end of the partial pressure unit is grounded by second partial pressure device.
Specifically, first partial pressure device is first resistor, and second partial pressure device is second resistance.
Specifically, the pressure regulation unit includes positive power source terminal, current limiting bleeder part, pressure regulation device；
The positive power source terminal is connected to the output end of the pressure regulation unit by the current limiting bleeder part；
The output end of the pressure regulation unit is connected to the input terminal of the pressure regulation unit by the pressure regulation device.
Specifically, the current limiting bleeder part is 3rd resistor；
The pressure regulation device is voltage-stabiliser tube, diode or resistance, when the pressure regulation device is the first voltage-stabiliser tube, anode
It is connected to the input terminal of the pressure regulation unit, cathode is connected to the output end of the pressure regulation unit, when the pressure regulation device is
When first diode, cathode is connected to the input terminal of the pressure regulation unit, and anode is connected to the output of the pressure regulation unit
End.
Specifically, the detection unit be buffer, the buffer be used for its input terminal input voltage be greater than or
The first level is exported when equal to first threshold, the second electricity of output when the input voltage of its input terminal is less than or equal to second threshold
Flat, the first threshold is greater than the second threshold.
Specifically, when the buffer its input terminal input voltage be less than or equal to the second threshold when, it is described
Second resistance is
R2=(Vt-VB)/[(VB-Vt-VO)/R1-(Vref-VB)/R3],
Wherein, VB is input voltage of the buffer in its input terminal, VtFor the pressure drop at pressure regulation device both ends, VO
For the voltage of the negative high voltage test side, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistance, and R3 is institute
State the resistance value of 3rd resistor, VrefFor the voltage of the positive power source terminal.
Specifically, as 0≤VBWhen≤V2, the second resistance meets:
(Vt-V2)/[(V2-Vt-VO)/R1-(Vref-V2)/R3]≤R2≤(Vt-0)/[(0-Vt-VO)/R1-Vref/ R3],
Wherein, V2 is the second threshold.
Specifically, when the buffer its input terminal input voltage be greater than or equal to the first threshold when, it is described
Second resistance is R2=R3* (VB-Vt)/(Vref-VB),
Wherein, R3 is the resistance value of the 3rd resistor, VBInput voltage for the buffer in its input terminal, VtFor institute
State the pressure drop at pressure regulation device both ends, VrefFor the voltage of the positive power source terminal.
Specifically, work as VBWhen >=V1, the second resistance meets:
R2≥R3*(V1-Vt)/(Vref- V1), V1 is the first threshold.
Specifically, the 3rd resistor meets following formula:
R3≥10Vref*R1/VO,
Wherein, R3 is the resistance value of the 3rd resistor, VrefFor the voltage of the positive power source terminal, R1 is the first resistor
Resistance value, VOFor the voltage of the negative high voltage test side.
On the other hand, a kind of negative high voltage abnormal detector is provided, including above-mentioned negative high voltage abnormal detection circuit；
Negative high voltage test side in the negative high voltage abnormal detection circuit is n, and n is the integer more than or equal to 2；
Partial pressure unit in the negative high voltage abnormal detection circuit is n；
Pressure regulation unit in the negative high voltage abnormal detection circuit is n；
The negative high voltage abnormal detector further includes n unidirectional current control unit；
The input terminal of n partial pressure unit is connected to n negative high voltage test side；
The output end of n partial pressure unit is connected to the input terminal of n pressure regulation unit；
The output end of n pressure regulation unit passes through n unidirectional current control unit respectively and is connected to negative high voltage inspection extremely
The input terminal of detection unit in slowdown monitoring circuit.
On the other hand, a kind of control circuit is provided, comprising:
The upper negative high voltage abnormal detection circuit；
For exporting the high voltage power supply of negative high voltage, the output end of the high voltage power supply is connected to the negative high voltage test side；
Overvoltage protecting unit, input terminal are connected to the output end of the pressure regulation unit, and output end is connected to the height
Voltage source, the Overvoltage protecting unit are used to when the absolute value of the voltage of the negative high voltage test side be more than preset abnormal increase
When threshold value, controls the high voltage power supply and stop working.
Specifically, the high voltage power supply includes the control terminal for being worked normally according to high level；
The Overvoltage protecting unit includes:
Comparator, negative input end are connected to the output end of the pressure regulation unit by the 5th resistance, and positive input terminal is logical
Cross the 6th resistance eutral grounding；
Triode, base stage are connected to the output end of the comparator by the 7th resistance, and collector is connected to described
Control terminal, emitter ground connection；
8th resistance, first end are connected to the base stage of the triode, second end ground connection.
Specifically, the 5th resistance is connected to the output end of the pressure regulation unit by the second voltage-stabiliser tube, and described second
The anode of voltage-stabiliser tube is connected to the output end of the pressure regulation unit, and the cathode of second voltage-stabiliser tube is connected to the 5th electricity
Resistance；
Above-mentioned control circuit further includes the second diode, and the output end of the pressure regulation unit is connected by second diode
It is connected to the input terminal of the detection unit, the anode of second diode is connected to the output end of the pressure regulation unit, described
The cathode of second diode is connected to the input terminal of the detection unit.
On the other hand, the embodiment of the present invention also provides a kind of imaging device, comprising: above-mentioned negative high voltage abnormality detection electricity
Road perhaps above-mentioned negative high voltage abnormal detector or above-mentioned control circuit.
Negative high voltage abnormal detection circuit, device, control circuit and imaging device provided in an embodiment of the present invention, first pass through tune
The negative voltage transition of negative high voltage test side is corresponding positive voltage by pressure unit, then judges negative high voltage according to the positive voltage
Whether test side outputs normal negative high voltage, compared with prior art, without using the mode of current detecting, so as to avoid
Due to negative high voltage export electric current it is small caused by detect not accurate problem, keep the detection of negative high voltage more accurate.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field
For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of structural schematic diagram of negative high voltage abnormal detection circuit in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of another negative high voltage abnormal detection circuit in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another negative high voltage abnormal detection circuit in the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of negative high voltage abnormal detector in the embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of control circuit in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another control circuit in the embodiment of the present invention.
[specific embodiment]
For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention with reference to the accompanying drawing
It states.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall within the protection scope of the present invention.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.In the embodiment of the present invention and the "an" of singular used in the attached claims, " described " and "the"
It is also intended to including most forms, unless the context clearly indicates other meaning.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate
There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three
Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
As shown in Figure 1, the embodiment of the present invention provides a kind of negative high voltage abnormal detection circuit, comprising: negative high voltage test side O；
Partial pressure unit 1, input terminal are connected to negative high voltage test side O；Pressure regulation unit 2, input terminal are connected to the output of partial pressure unit 1
End, the negative voltage transition that pressure regulation unit 2 is used to export the output end of partial pressure unit 1 are corresponding positive voltage；Detection unit 3,
Its input terminal is connected to the output end of pressure regulation unit 2, and the positive voltage value that detection unit 3 is used to be exported according to pressure regulation unit 2 judges
Whether the output of negative high voltage test side O is abnormal.
The effect of partial pressure unit 1 is sampled to the voltage value of negative high voltage test side O, the voltage input after sampling to tune
Unit 2 is pressed, the negative voltage transition sampled is corresponding positive voltage value by pressure regulation unit 2, and it is single that the value is then input to detection
Member 3, since the voltage value at the positive voltage value and negative high voltage test side O has corresponding relationship, detection unit 3 can basis
The positive voltage value judges whether negative high voltage test side O outputs normal negative high voltage.
Negative high voltage abnormal detection circuit in the present embodiment first passes through pressure regulation unit for the negative voltage of negative high voltage test side
Corresponding positive voltage is converted to, then judges whether negative high voltage test side outputs normal negative high voltage according to the positive voltage,
Compared with prior art, without using the mode of current detecting, so as to avoid the electric current exported due to negative high voltage is small and causes
The not accurate problem of detection, keep the detection of negative high voltage more accurate.
As shown in Fig. 2, specifically, partial pressure unit 1 includes: the first partial pressure device and the second partial pressure device, partial pressure unit 1
Input terminal is connected to the output end (i.e. the input terminal A of pressure regulation unit 2) of partial pressure unit 1 by the first partial pressure device；Partial pressure unit 1
Output end pass through the second partial pressure device be grounded.First partial pressure device is first resistor R1, and the second partial pressure device is second resistance
R2.In addition to resistance, the second partial pressure device may be the partial pressure device of other forms, such as voltage-stabiliser tube or diode, when second
When partial pressure device is voltage-stabiliser tube, cathode ground connection, anode is connect with the first partial pressure device, when the second partial pressure device is diode
When, plus earth, cathode is connect with the first partial pressure device.
Specifically, pressure regulation unit 2 includes positive power source terminal Vref, current limiting bleeder part and pressure regulation device；Positive power source terminal Vref
The output end B of pressure regulation unit 2 is connected to by current limiting bleeder part；The output end B of pressure regulation unit 2 is connected to by pressure regulation device
The input terminal A of pressure regulation unit 2.Current limiting bleeder part is 3rd resistor R3；Pressure regulation device is voltage-stabiliser tube, diode or resistance.When
When pressure regulation device is the first voltage-stabiliser tube, anode is connected to the input terminal A of pressure regulation unit 2, and cathode is connected to pressure regulation unit 2
Output end B；When pressure regulation device is first diode, cathode is connected to the input terminal A of pressure regulation unit 2, and anode is connected to
The output end B of pressure regulation unit 2.The present embodiment is introduced by taking the first voltage-stabiliser tube ZD1 as an example.The voltage V of positive power source terminal Vrefref
It can be 3.3V or 5V, be a determining value, the voltage V of the output end B of pressure regulation unit 2B=VA+VZD1, wherein VAIt is pressure regulation list
Voltage value at the input terminal A of member 2, i.e. the voltage V of negative high voltage test side OOVoltage value after carrying out first resistor R1 partial pressure,
VZD1For the pressure drop at the first both ends voltage-stabiliser tube ZD1, VZD1Value is determined for one.By the boosting of the first voltage-stabiliser tube ZD1, make to bear
Voltage VAIt is converted into positive voltage VB, work as VOAbsolute value get over hour, then VBIt is bigger, work as VOAbsolute value it is bigger when, then VBIt is smaller,
According to this characteristic, detection unit 3 can be according to the voltage V of inputBWhether the output to judge negative high voltage test side O is abnormal.
As shown in figure 3, specifically, detection unit 3 is buffer U1B, buffer U1B is used for the input electricity in its input terminal
Pressure exports the first level (high level) when being greater than or equal to first threshold V1, is less than or equal to the in the input voltage of its input terminal
Second electrical level (low level) is exported when two threshold value V2, first threshold V1 is greater than second threshold V2.The supply voltage of buffer U1B is not
Together, the value of first threshold V1 and second threshold V2 are also different, for example, when the supply voltage of buffer U1B is 3.3V, V1=
2V, V2=0.8V.
The characteristics of according to buffer U1B, may be implemented to negative high voltage test side O output whether Yi Chang detection, when bear
When high pressure test side O is without output, i.e. output abnormality, buffer U1B exports high level, the i.e. output of pressure regulation unit 2 at this time at this time
Hold the voltage V of BBMore than or equal to V1；When negative high voltage test side, O has output negative voltage, i.e. output is normal, at this time buffer
U1B exports low level, i.e., the voltage of the output end B of pressure regulation unit 2 meets at this time: 0≤VB≤ V2, buffer U1B are in its input
The input voltage at end is equivalent to the voltage V of the output end B of pressure regulation unit 2B。
When O output in negative high voltage test side is normal, i.e., when buffer U1B is less than or equal in the input voltage of its input terminal
When second threshold V2, according to VB=VA+VZD1, V can be obtainedA=VB-VZD1。
IZD1=IR3=(Vref-VB)/R3, wherein IZD1For the current value for flowing through the first voltage-stabiliser tube ZD1, IR3To flow through third
The current value of resistance R3, VrefFor the voltage value of positive power source terminal Vref output, R3 is the resistance value of 3rd resistor R3.
IR1=(VA-VO)/R1=(VB-VZD1-VO)/R1, wherein IR1For the current value for flowing through first resistor R1, R1
The resistance value of one resistance R1.
IR2=(0-VA)/R2=(VZD1-VB)/R2, wherein IR2For the current value for flowing through second resistance R2, R2 is the second electricity
Hinder the resistance value of R2.
According to IZD1+IR2=IR1, equation can be obtained
(Vref-VB)/R3+(VZD1-VB)/R2=(VB-VZD1-VO)/R1,
That is R2=(VZD1-VB)/[(VB-VZD1-VO)/R1-(Vref-VB)/R3],
As 0≤VBWhen≤V2, second resistance R2 needs to meet
(VZD1-V2)/[(V2-VZD1-VO)/R1-(Vref-V2)/R3]≤R2≤(VZD1-0)/[(0-VZD1-VO)/R1-
Vref/R3],
When negative high voltage test side O is without output, according to VB=VA+VZD1, VA=VB-VZD1, IZD1=IR3=IR2=(Vref-
VB)/R3=VA/ R2,
When buffer U1B its input terminal input voltage be greater than or equal to first threshold V1 when, R2=R3* (V can be obtainedB-
VZD1)/(Vref-VB), i.e. VBWhen >=V1, R2 >=R3* (V1-V need to be metZD1)/(Vref-V1)。
Formula obtained from when above-mentioned formula is using pressure regulation device as voltage-stabiliser tube, when pressure regulation device is diode or electricity
When resistance, above-mentioned formula is also suitable, then when O output in negative high voltage test side is normal, i.e., when buffer U1B is in the defeated of its input terminal
When entering voltage less than or equal to second threshold V2, R2=(Vt-VB)/[(VB-Vt-VO)/R1-(Vref-VB)/R3], when 0≤VB≤
V2, second resistance meet
(Vt-V2)/[(V2-Vt-VO)/R1-(Vref-V2)/R3]≤R2≤(Vt-0)/[(0-Vt-VO)/R1-Vref/ R3],
When negative high voltage test side O is without output, second resistance is R2=R3* (VB-Vt)/(Vref-VB)；
Simultaneously according to VBWhen >=V1, R2 >=R3* (V1-Vt)/(Vref- V1), VtFor the pressure drop at pressure regulation device both ends.
Therefore, in conclusion in order to make High Abnormal Pressure detection circuit play its effect, second resistance must meet simultaneously with
Lower two inequality:
(Vt-V2)/[(V2-Vt-VO)/R1-(Vref-V2)/R3]≤R2≤(Vt-0)/[(0-Vt-VO)/R1-Vref/ R3],
And R2 >=R3* (V1-Vt)/(Vref-V1)。
In addition, in order to guarantee VAFor negative voltage, VBFor positive voltage, electric current is analyzed, IZD1=IR3, theoretically IR3+IR2
=IR1, since the output electric current of negative high voltage is very weak, only μ A rank, so if IR3Compare IR1Also it will change tune greatly
The current direction of the input terminal A of unit 2 is pressed, at this time IR3=IR2+IR1, VAIt just will become positive voltage, at this time VB=VA+VZD1It is then electric
Press VBIt may be more than V2, cause to detect mistake, therefore, in order to avoid due to VABecome positive voltage and makes VBIt not can correctly reflect
The case where negative high voltage exports needs 3rd resistor R3 to use the resistance of larger resistance value, it is preferable that so that IR3≤IR1/ 10, IR3's
Maximum value is Vref/ R3, IR1≈VO/ R1 can obtain 3rd resistor R3 and meet R3 >=10Vref*R1/VO。
As shown in figure 4, the embodiment of the present invention also provides a kind of negative high voltage abnormal detector, it is different including above-mentioned negative high voltage
Normal detection circuit, the negative high voltage test side O in negative high voltage abnormal detection circuit are n, and n is the integer more than or equal to 2, negative high voltage
Partial pressure unit 1 in abnormal detection circuit is n；Pressure regulation unit 2 in negative high voltage abnormal detection circuit is n；Negative high voltage is different
Normal detection device further includes n unidirectional current control unit 4；The input terminal of n partial pressure unit 1 is connected to n negative high voltage
Test side O；The output end of n partial pressure unit 1 is connected to the input terminal of n pressure regulation unit 2；The output of n pressure regulation unit 2
End is connected to the input terminal of the detection unit 3 in negative high voltage abnormal detection circuit by n unidirectional current control unit 4 respectively.
Unidirectional current control unit 4 can be diode, and the anode of diode is connected to the output end of partial pressure unit 2, and diode is born
Pole is connected to the input terminal of detection unit 3.By multiple partial pressure units and pressure regulation unit can to multiple negative high voltage test sides into
The detection that row exports extremely, when multiple negative high voltage test side O export normal, detection unit 3 exports low level, when any one
When a negative high voltage test side O does not have voltage, detection unit 3 exports high level.
Specifically, the output end of partial pressure unit 1 is grounded by first capacitor C1；The output end of pressure regulation unit 2 passes through second
Capacitor C2 ground connection；The output end of detection unit 3 is grounded by the 4th resistance R4 and third capacitor C3, the first end of the 4th resistance R4
It is connected to the output end of detection unit 3, the second end of the 4th resistance R4 is grounded by third capacitor C3.Above-mentioned capacitor plays filter
The effect of wave.In addition, when buffer U1B be collector open-drain output when, output end by pull-up resistor be connected to it is above-mentioned just
Power end Vref.
As shown in figure 5, the present embodiment also provides a kind of control circuit, which includes: that above-mentioned negative high voltage is abnormal
Detection circuit；For exporting the high voltage power supply 5 of negative high voltage, the output end of high voltage power supply 5 is connected to negative high voltage test side O；Over-voltage
Protection location 6, input terminal are connected to the output end of pressure regulation unit 2, and output end is connected to high voltage power supply 5, overvoltage protection list
Member 6 is for the voltage V as negative high voltage test side OOAbsolute value be more than it is preset abnormal when increasing threshold value, control high voltage power supply 5
It stops working.When the absolute value of the negative high voltage of negative high voltage test side O output is increased to more than preset abnormal increase threshold value, VB
It can be reduced to corresponding value, such as 0, illustrate that the absolute value of the negative high voltage of negative high voltage test side O output is excessive at this time, need height
Voltage source 5 stops working, to realize overvoltage protection.
Specifically, as shown in fig. 6, high voltage power supply 5 includes the control terminal C for being worked normally according to high level；Over-voltage is protected
Protecting unit 6 includes: comparator U2A, and negative input end is connected to the output end of pressure regulation unit 2 by the 5th resistance R5, just defeated
Enter end to be grounded by the 6th resistance R6；Triode Q, base stage are connected to the output end of comparator U2A by the 7th resistance R7,
Collector is connected to above-mentioned control terminal C, emitter ground connection；8th resistance R8, first end are connected to the base stage of triode Q,
Its second end ground connection.When the negative input end input of comparator U2A is bigger than the voltage of positive input terminal, comparator U2A output
Low level, conversely, then exporting high level.The positive input terminal of comparator U2A is grounded by the 6th resistance R6, then its positive input terminal
Voltage is 0V, when the normal output negative high voltage of high voltage power supply 5, VBGreater than 0V, then the voltage of the negative input end of comparator U2A is big
In 0V, the voltage of negative input end is greater than the voltage of positive input terminal, therefore comparator U2A can export low level, triode Q not work
Make, high voltage power supply 5 is not influenced.When the negative high voltage absolute value of negative high voltage test side O output increases extremely, VBIt can reduce,
When dropping below 0V, comparator U2A can export high level, and control terminal C is then switched to ground, therefore controlled by triode Q conducting
End C processed will be unable to normally obtain high level, and high voltage power supply 5 then stops working, and high voltage power supply 5 is without output at this time, at this time VBBecome
High level, detection unit 3 export high level, negative high voltage output abnormality are judged, to realize overvoltage protection control.
In addition, when the negative high voltage range that high voltage power supply 5 exports is wider, VBNegative pressure may be will become, but cannot be allowed at this time
Overvoltage protecting unit 6 executes overvoltage protection, therefore increases between the negative input end of comparator U2A and the output end of pressure regulation unit 2
Add the second voltage-stabiliser tube ZD2, specifically, the 5th resistance R5 is connected to the output end of pressure regulation unit 2 by the second voltage-stabiliser tube ZD2, should
The anode of second voltage-stabiliser tube ZD2 is connected to the output end of pressure regulation unit 2, and the cathode of second voltage-stabiliser tube ZD2 is connected to the 5th electricity
Hinder R5.When the negative high voltage range exported when high voltage power supply 5 is wider, VBDue to the second voltage-stabiliser tube when may will become negative pressure
The boosting of ZD2, moreover it is possible to guarantee that the voltage of the negative input end of comparator U2A is greater than 0V, Overvoltage protecting unit 6 does not execute at this time
Overvoltage protection.Above-mentioned negative high voltage abnormal detection circuit further includes the 4th diode D4 simultaneously, and the output end of pressure regulation unit 2 passes through the
Second diode D2 is connected to the input terminal of detection unit 3, and the anode of the second diode D2 is connected to the output of pressure regulation unit 2
End, the cathode of the second diode D2 are connected to the input terminal of detection unit 3.The negative pressure of the output end B of pressure regulation unit 2 passes through second
The effect of diode D2 is isolated with the input terminal of buffer U1B, the input terminal no-voltage input of buffer U1B, output
End default still exports low level, therefore when the negative high voltage range that high voltage power supply 5 exports is wider, due to VBAt this moment it may be negative
Voltage makes the input terminal of detection unit 3 export detection unit 3 without input voltage by the buffer action of the second diode D2
Low level, to guarantee being normally carried out for detection.
Specifically, above-mentioned control circuit further include: controller 7, controller 7 have control signal output 71 and test side
Mouth 72, detection port 72 are connected to the second end of the 4th resistance R4, and control signal output 71 is modulated for output pulse width
(Pulse Width Modulation, PWM) signal.High voltage power supply 5 includes buffer U1A, and the input terminal of buffer U1A connects
In control signal output 71, when buffer U1A is collector open-drain output, output end is connected to by the 9th resistance R9
Positive power source terminal Vref, high voltage power supply 5 further include: the tenth resistance R10, first end are connected to the output end of buffer U1A, the
Two ends are grounded by the 4th capacitor C4；Eleventh resistor R11, first end are connected to the second end of the tenth resistance R10；Operation is put
Big device U2D, negative input end are connected to the second end of eleventh resistor R11, successively go here and there between output end and its negative input end
It is associated with twelfth resistor R12 and the 5th capacitor C5；Thirteenth resistor R13, first end are connected to the output of operational amplifier U2D
End；Triode Q1, base stage are connected to the second end of thirteenth resistor R13, emitter ground connection；6th capacitor C6, first end
It is connected to the second end of thirteenth resistor R13；14th resistance R14, first end are connected to the second of thirteenth resistor R13
End；7th capacitor C7, first end are connected to the second end of the 14th resistance R14, and second end is connected to the collection of triode Q1
Electrode；15th resistance R15, first end are connected to the second end of the 6th capacitor C6；Transformer T1, the first end of primary side
It is connected to the second end of the 15th resistance R15, the second end of primary side is connected to the collector of triode Q1；8th capacitor
C8, first end are connected to the first end of the secondary side of transformer T1；Third diode D3, anode are connected to the 8th capacitor C8
Second end, cathode is connected to the second end of the secondary side of transformer T1；4th diode D4, cathode are connected to the 8th electricity
Hold the second end of C8；9th capacitor C9, first end are connected to the anode of the 4th diode D4, and second end is connected to transformer
The second end of the secondary side of T1；16th resistance R16, first end are connected to the positive input terminal of operational amplifier U2D, and second
End is connected to the anode of the 4th diode D4；17th resistance R17, first end are connected to the anode of the 4th diode D4,
Output end of the second end as high voltage power supply 5 is connected to negative high voltage test side O；5th diode D5, anode are connected to the tenth
The first end of one resistance R11, cathode are connected to the positive input terminal of operational amplifier U2D；18th resistance R18, first end
It is connected to the cathode of the 5th diode D5, second end ground connection；Tenth capacitor C10, first end are connected to operational amplifier U2D
Positive input terminal, second end ground connection；19th resistance R19, first end are connected to the positive input terminal of operational amplifier U2D,
Its second end is connected to positive power source terminal Vref.The positive input terminal of operational amplifier U2D is used as above-mentioned control terminal C simultaneously, and with mistake
Press the collector connection of the triode Q in protection location 6.
Tenth resistance R10 and the 4th capacitor C4 forms low-pass filter, and low-pass filter will be by the PWM of buffer U1A
Signal becomes a direct-flow positive voltage, which is input to the negative input end of operational amplifier U2D, the 18th resistance
R18 and the 19th resistance R19 is by the voltage V of positive power source terminal VrefrefIt is divided to the positive input terminal of operational amplifier U2D, the tenth electricity
Hold C10 for being filtered to the positive input terminal of operational amplifier U2D, the 5th capacitor C5 and twelfth resistor R12 are amplifier benefit
Circuit is repaid, for adjusting the output voltage and phase of operational amplifier U2D, the output voltage of operational amplifier U2D passes through the tenth
Three resistance R13 drive self-oscillation route generate concussion voltage, self-oscillation route include triode Q1, the 14th resistance R14,
15th resistance R15, the 6th capacitor C6, the 7th capacitor C7 and transformer T1, transformer T1 generate the triode Q1 of primary side
Oscillating voltage boosting, transformer T1 secondary side output high pressure shake voltage, high pressure shake voltage by multiplication of voltage route it is defeated
A negative dc high voltage out, multiplication of voltage route include third diode D3, the 4th diode D5, the 8th capacitor C8 and the 9th capacitor C9,
16th resistance R16 is used to form the feedback of operational amplifier U2D, by adjusting the positive input terminal voltage of operational amplifier U2D
Negative high voltage export high voltage power supply 5 tends towards stability, and the 17th resistance R17 is current-limiting resistance.Control electricity in the present embodiment
Road, controller 7 detect high level by detecting port 72, judge that the output abnormality of high voltage power supply 5, controller 7 pass through control
The output of the interruption pwm signal of signal output end 71.Buffer U1B and buffer U1A therein can play buffer action, prevent
Interfering with each other between control signal output 71 and detection port 72 and high voltage power supply 5.Therefore pass through a common inspection
The testing result for surveying the output of the detection unit 3 ready to receive of port 72, without as real using A/D conversion module in the prior art
Now to the abnormality detection of negative high voltage.
Control circuit in the present embodiment can be applied in imaging device, and imaging device is according to the control circuit mesohigh
The negative high voltage of power supply output carries out paper feed, charging, exposure, development, transfer, the engine operations such as fixing, wherein imaging device includes
One engine controller, the engine controller can replace the controller in control circuit.
In addition, imaging device itself also includes above-mentioned high voltage power supply, the negative high voltage of high voltage power supply output is applied to engine
In operation, imaging device may include above-mentioned negative high voltage abnormal detection circuit, the negative height according to negative high voltage abnormal detection circuit
Whether pressure test side is normal come the negative high voltage output for detecting high voltage power supply, then receives negative high voltage by engine controller and examines extremely
The output result of slowdown monitoring circuit controls the output of high voltage power supply.Engine controller detects that negative high voltage is examined extremely by detecting port
When slowdown monitoring circuit exports high level, judge that the output abnormality of high voltage power supply, engine controller interrupt pwm signal and be output to high-voltage electricity
Source.
In addition, exporting multiple and different negative high voltages when imaging device has multiple high voltage power supplies and being applied to different engine behaviour
When making, imaging device may include above-mentioned negative high voltage abnormal detector, according to the multiple negative of negative high voltage abnormal detector
Whether high pressure test side is normal come the negative high voltage output for detecting multiple high voltage power supplies, then receives negative high voltage by engine controller
The output result of abnormal detection circuit controls the output of multiple high voltage power supplies.
Imaging device is according to above-mentioned control circuit or negative high voltage abnormal detection circuit or negative high voltage abnormal detector energy
It is enough effectively, the exception of easily detection negative high voltage output, ensure that the safety utilization of electric power of imaging device, and can not need using at
This higher A/D conversion module realizes the abnormality detection to negative high voltage.
Imaging device in the present embodiment can print for printer, facsimile machine, duplicator, set, scanning, duplicate, pass
Very in one of the Multi Role Aircraft of one.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided by the present invention, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or group
Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown
Or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, device or unit it is indirect
Coupling or communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
It is each that device (can be personal computer, server or network equipment etc.) or processor (Processor) execute the present invention
The part steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. it is various
It can store the medium of program code.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (10)
1. a kind of negative high voltage abnormal detection circuit characterized by comprising
Negative high voltage test side；
Partial pressure unit, input terminal are connected to the negative high voltage test side；
Pressure regulation unit, input terminal are connected to the output end of the partial pressure unit, and the pressure regulation unit is used for the partial pressure is single
The negative voltage transition of the output end output of member is corresponding positive voltage；
Detection unit, input terminal are connected to the output end of the pressure regulation unit, and the detection unit is used for according to the pressure regulation
The positive voltage value of unit output judges whether the output of the negative high voltage test side is abnormal；
The partial pressure unit includes:
The input terminal of first partial pressure device and the second partial pressure device, the partial pressure unit is connected to by first partial pressure device
The output end of the partial pressure unit；
The output end of the partial pressure unit is grounded by second partial pressure device；
First partial pressure device is first resistor, and second partial pressure device is second resistance；
The pressure regulation unit includes positive power source terminal, current limiting bleeder part, pressure regulation device；
The positive power source terminal is connected to the output end of the pressure regulation unit by the current limiting bleeder part；
The output end of the pressure regulation unit is connected to the input terminal of the pressure regulation unit by the pressure regulation device；
The current limiting bleeder part is 3rd resistor；
The pressure regulation device is voltage-stabiliser tube, diode or resistance, when the pressure regulation device is the first voltage-stabiliser tube, anode connection
In the input terminal of the pressure regulation unit, cathode is connected to the output end of the pressure regulation unit, when the pressure regulation device is first
When diode, cathode is connected to the input terminal of the pressure regulation unit, and anode is connected to the output end of the pressure regulation unit.
2. circuit according to claim 1, which is characterized in that
The detection unit is buffer, and the buffer is used to be greater than or equal to first threshold in the input voltage of its input terminal
When export the first level, export second electrical level when the input voltage of its input terminal is less than or equal to second threshold, described first
Threshold value is greater than the second threshold.
3. circuit according to claim 2, which is characterized in that
When the buffer is when the input voltage of its input terminal is less than or equal to the second threshold, the second resistance is
R2=(Vt-VB)/[(VB-Vt-VO)/R1-(Vref-VB)/R3],
Wherein, VBInput voltage for the buffer in its input terminal, VtFor the pressure drop at pressure regulation device both ends, VOFor institute
State the voltage of negative high voltage test side, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistance, and R3 is described the
The resistance value of three resistance, VrefFor the voltage of the positive power source terminal；
As 0≤VBWhen≤V2, the second resistance meets:
(Vt-V2)/[(V2-Vt-VO)/R1-(Vref-V2)/R3]≤R2≤(Vt-0)/[(0-Vt-VO)/R1-Vref/ R3],
Wherein, V2 is the second threshold.
4. circuit according to claim 2, which is characterized in that
When the buffer is when the input voltage of its input terminal is greater than or equal to the first threshold, the second resistance is R2
=R3* (VB-Vt)/(Vref-VB),
Wherein, R3 is the resistance value of the 3rd resistor, VBInput voltage for the buffer in its input terminal, VtFor the tune
The pressure drop at voltage device both ends, VrefFor the voltage of the positive power source terminal；
Work as VBWhen >=V1, the second resistance meets:
R2≥R3*(V1-Vt)/(Vref- V1), V1 is the first threshold.
5. circuit according to claim 1 or 2, which is characterized in that the 3rd resistor meets following formula:
R3≥10Vref*R1/VO,
Wherein, R3 is the resistance value of the 3rd resistor, VrefFor the voltage of the positive power source terminal, R1 is the resistance of the first resistor
Value, VOFor the voltage of the negative high voltage test side.
6. a kind of negative high voltage abnormal detector, which is characterized in that including negative as described in any one of claim 1 to 5
High Abnormal Pressure detection circuit；
Negative high voltage test side in the negative high voltage abnormal detection circuit is n, and n is the integer more than or equal to 2；
Partial pressure unit in the negative high voltage abnormal detection circuit is n；
Pressure regulation unit in the negative high voltage abnormal detection circuit is n；
The negative high voltage abnormal detector further includes n unidirectional current control unit；
The input terminal of n partial pressure unit is connected to n negative high voltage test side；
The output end of n partial pressure unit is connected to the input terminal of n pressure regulation unit；
The output end of n pressure regulation unit passes through n unidirectional current control unit respectively and is connected to the negative high voltage abnormality detection electricity
The input terminal of detection unit in road.
7. a kind of control circuit characterized by comprising
Negative high voltage abnormal detection circuit as described in any one of claim 1 to 5；
For exporting the high voltage power supply of negative high voltage, the output end of the high voltage power supply is connected to the negative high voltage test side；
Overvoltage protecting unit, input terminal are connected to the output end of the pressure regulation unit, and output end is connected to the high-voltage electricity
Source, the Overvoltage protecting unit are used to when the absolute value of the voltage of the negative high voltage test side be more than preset abnormal increase threshold value
When, it controls the high voltage power supply and stops working.
8. circuit according to claim 7, which is characterized in that
The high voltage power supply includes the control terminal for being worked normally according to high level；
The Overvoltage protecting unit includes:
Comparator, negative input end are connected to the output end of the pressure regulation unit by the 5th resistance, and positive input terminal passes through the
Six resistance eutral groundings；
Triode, base stage are connected to the output end of the comparator by the 7th resistance, and collector is connected to the control
End, emitter ground connection；
8th resistance, first end are connected to the base stage of the triode, second end ground connection.
9. circuit according to claim 8, which is characterized in that
5th resistance is connected to the output end of the pressure regulation unit, the anode of second voltage-stabiliser tube by the second voltage-stabiliser tube
It is connected to the output end of the pressure regulation unit, the cathode of second voltage-stabiliser tube is connected to the 5th resistance；
Above-mentioned control circuit further includes the second diode, and the output end of the pressure regulation unit is connected to by second diode
The input terminal of the detection unit, the anode of second diode are connected to the output end of the pressure regulation unit, and described second
The cathode of diode is connected to the input terminal of the detection unit.
10. a kind of imaging device characterized by comprising
Negative high voltage abnormal detection circuit as described in any one of claim 1 to 5, or it is as claimed in claim 6 negative
High Abnormal Pressure detection device, or the control circuit as described in any one of claim 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197149.9A CN106771488B (en) | 2016-12-22 | 2016-12-22 | Negative high voltage abnormal detection circuit, device, control circuit and imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197149.9A CN106771488B (en) | 2016-12-22 | 2016-12-22 | Negative high voltage abnormal detection circuit, device, control circuit and imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106771488A CN106771488A (en) | 2017-05-31 |
| CN106771488B true CN106771488B (en) | 2019-10-15 |
Family
ID=58897400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611197149.9A Active CN106771488B (en) | 2016-12-22 | 2016-12-22 | Negative high voltage abnormal detection circuit, device, control circuit and imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106771488B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219516A (en) * | 2021-04-28 | 2021-08-06 | 宏景科技股份有限公司 | Monitoring device for cosmic ray mu sub-signals |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1896882A (en) * | 2005-07-15 | 2007-01-17 | 三星电子株式会社 | Ac high voltage detecting device |
| CN101226212A (en) * | 2008-02-02 | 2008-07-23 | 华为技术有限公司 | Voltage testing circuit |
| CN102288813A (en) * | 2011-07-19 | 2011-12-21 | 武汉理工大学 | Fuel cell stack monolithic voltage inspection system capable of detecting positive and negative voltages |
| CN103823104A (en) * | 2014-02-24 | 2014-05-28 | 中国航天时代电子公司 | Circuit for measuring positive voltage and negative voltage in automatic ranging mode under single power supply condition |
| CN104034956A (en) * | 2014-05-30 | 2014-09-10 | 杭州电子科技大学 | Positive/negative voltage measuring circuit |
| CN104166035A (en) * | 2013-05-16 | 2014-11-26 | 浩阳半导体股份有限公司 | Negative voltage detection apparatus |
| CN203981753U (en) * | 2014-08-06 | 2014-12-03 | 南京普爱射线影像设备有限公司 | A kind of high tension voltage sampler for X-ray machine |
| CN204086502U (en) * | 2014-08-22 | 2015-01-07 | 深圳怡化电脑股份有限公司 | A kind of supervisory circuit of multiple power supplies |
| CN104422809A (en) * | 2013-08-28 | 2015-03-18 | 飞思卡尔半导体公司 | Negative voltage measurement |
| TW201602593A (en) * | 2014-07-11 | 2016-01-16 | 茂達電子股份有限公司 | Voltage detection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7808753B2 (en) * | 2007-02-27 | 2010-10-05 | Taiwan Semiconductor Manufacturing Co., Ltd. | System and method for monitoring negative bias in integrated circuits |
-
2016
- 2016-12-22 CN CN201611197149.9A patent/CN106771488B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1896882A (en) * | 2005-07-15 | 2007-01-17 | 三星电子株式会社 | Ac high voltage detecting device |
| CN101226212A (en) * | 2008-02-02 | 2008-07-23 | 华为技术有限公司 | Voltage testing circuit |
| CN102288813A (en) * | 2011-07-19 | 2011-12-21 | 武汉理工大学 | Fuel cell stack monolithic voltage inspection system capable of detecting positive and negative voltages |
| CN104166035A (en) * | 2013-05-16 | 2014-11-26 | 浩阳半导体股份有限公司 | Negative voltage detection apparatus |
| CN104422809A (en) * | 2013-08-28 | 2015-03-18 | 飞思卡尔半导体公司 | Negative voltage measurement |
| CN103823104A (en) * | 2014-02-24 | 2014-05-28 | 中国航天时代电子公司 | Circuit for measuring positive voltage and negative voltage in automatic ranging mode under single power supply condition |
| CN104034956A (en) * | 2014-05-30 | 2014-09-10 | 杭州电子科技大学 | Positive/negative voltage measuring circuit |
| TW201602593A (en) * | 2014-07-11 | 2016-01-16 | 茂達電子股份有限公司 | Voltage detection circuit |
| CN203981753U (en) * | 2014-08-06 | 2014-12-03 | 南京普爱射线影像设备有限公司 | A kind of high tension voltage sampler for X-ray machine |
| CN204086502U (en) * | 2014-08-22 | 2015-01-07 | 深圳怡化电脑股份有限公司 | A kind of supervisory circuit of multiple power supplies |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106771488A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102457190B (en) | Power supply system and image forming apparatus | |
| US8873991B2 (en) | Power supply system, image forming apparatus having the same, and low-capacity AC processing circuit | |
| US20140218827A1 (en) | Power supply system | |
| CN1941582B (en) | High power supply to control an abnormal load | |
| CN102545615B (en) | Power supply system and image forming apparatus | |
| CN103503296B (en) | PFC signal generating circuit, the PFC Controlling System using PFC signal generating circuit and PFC control method | |
| CN106961094B (en) | The system of input undervoltage and overvoltage protection is provided for supply convertor | |
| JP3702142B2 (en) | DC power supply circuit and electronic device using the same | |
| CN106771488B (en) | Negative high voltage abnormal detection circuit, device, control circuit and imaging device | |
| CN211930498U (en) | Starting circuit, series resonance conversion device and switching power supply | |
| CN101119085B (en) | PWM solar power control module of PWM solar controller | |
| CN104950161B (en) | The method for detecting output voltage and circuit and its Switching Power Supply of a kind of Switching Power Supply | |
| CN105391320B (en) | Polyphase source circuit | |
| CN113036722B (en) | Voltage conversion device | |
| CN111162597A (en) | Power-down protection circuit and robot control system | |
| CN105846663B (en) | Operating system and control method | |
| CN205489774U (en) | Power supply unit and printer | |
| US20160336799A1 (en) | Commercial ac power shutdown detecting apparatus, and system including the same | |
| CN205566078U (en) | Information -processing device | |
| CN115549032A (en) | Overvoltage protection circuit, PFC output system and air conditioner | |
| CN113328606A (en) | Alternating current input voltage detection circuit | |
| CN105262354A (en) | Alternating-current power source detection device | |
| JP6561321B2 (en) | Switching power supply | |
| CN104734507A (en) | Power supply controller for detecting brownout and brownin, power supply and control method | |
| CN215343897U (en) | Overvoltage protection circuit, PFC output system and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201117 Address after: 519060 A, building 3, building 01, 3883 Zhuhai Avenue, Zhuhai, Guangdong, China Patentee after: ZHUHAI PANTUM ELECTRONICS Co.,Ltd. Address before: 519060 Area A, 7th Floor, Building 01, No. 3883, Zhuhai Avenue, Xiangzhou District, Zhuhai City, Guangdong Province Patentee before: Zhuhai Saine Printing Technology Co.,Ltd. |