CN204666166U - Capacitor charge and discharge control module and power frequency change-over circuit - Google Patents
Capacitor charge and discharge control module and power frequency change-over circuit Download PDFInfo
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- CN204666166U CN204666166U CN201520362193.5U CN201520362193U CN204666166U CN 204666166 U CN204666166 U CN 204666166U CN 201520362193 U CN201520362193 U CN 201520362193U CN 204666166 U CN204666166 U CN 204666166U
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Abstract
The simplification of a kind of processing procedure, the simple capacitor charge and discharge control module of circuit structure and power frequency change-over circuit are provided, wherein power frequency change-over circuit, comprise: an operational amplifier, its first input end is the input end of described circuit, its second input end grounding, its output terminal is electrically connected to the first input end of comparer; One integrating capacitor, is attempted by between the first input end of operational amplifier and output terminal; One comparer, its first input end is electrically connected with the output terminal of operational amplifier, and its second input end is electrically connected with a reference voltage source, and its output terminal is electrically connected to the input end of Logic control module; One Logic control module, its first, second output terminal is electrically connected to Access Control unit and the control of discharge unit thereof of capacitor charge and discharge control module respectively, in parallel with integrating capacitor to control one of first, second switch-capacitor; First, second control signal is either-or selection control signal, and the 3rd output terminal of Logic control module is the output terminal of described circuit.The utility model circuit structure is simple, precision is high, there is not the nonlinearity erron of capacitor discharge introducing.
Description
Technical field
The utility model relates to technical field of integrated circuits, particularly relates to a kind of the capacitor charge and discharge control module and the power frequency change-over circuit that current output signal are carried out to the process of power frequency switching signal.
Background technology
It is the mode signal output that sensor is conventional that current signal exports, and has current/voltage to change and power frequency conversion to the method that the process of current output signal is conventional.
Current/voltage conversion regime realizes the conversion of electric current to voltage by introducing resistance, and after changing, output signal is voltage signal.Because output voltage signal is still simulating signal, need to become digital signal through analog to digital converter again, be supplied to MCU (MicroControl Unit) process.This processing mode circuit structure is complicated, and the pilot process of needs is many, introduces noise large.When the high-precision signal transacting of needs, also need to increase extra circuit and carry out noise reduction process, need higher cost.
Power frequency conversion regime is by introducing integrating capacitor, the conversion of electric current to frequency is realized by the periodicity discharge and recharge of electric current to integrating capacitor, frequency signal after changing is the amplitude square-wave signal identical with supply voltage, directly can be processed by the counter of MCU or timer, circuit structure is simple, is the patented claim of US4109168 see U.S. Patent Publication No..But it can produce error to the time that integrating capacitor is discharged, a nonlinearity erron therefore can be introduced; When output frequency is higher, this nonlinearity erron is larger, affects the precision of signal transacting.
Therefore, how to realize power frequency conversion and the nonlinearity erron avoiding capacitor discharge to introduce, the precision improving signal transacting becomes problem demanding prompt solution.
Utility model content
The purpose of this utility model is, the integrating capacitor electric discharge existed for power frequency conversion regime in prior art can introduce nonlinearity erron, affect the technical matters of the precision of signal transacting, the simplification of a kind of processing procedure, the simple capacitor charge and discharge control module of circuit structure and power frequency change-over circuit are provided, realize power frequency conversion and capacitor discharge can not introduce nonlinearity erron, improve the precision of signal transacting simultaneously.
For achieving the above object, the utility model provides a kind of capacitor charge and discharge control module, is applicable to integrating circuit, comprises: an Access Control unit and a control of discharge unit; Described Access Control unit, for according to one first control signal control one first switch-capacitor in parallel with the integrating capacitor in described integrating circuit after access power frequency change-over circuit or according to one second control signal control one second switch-capacitor in parallel with described integrating capacitor after access power frequency change-over circuit; Described control of discharge unit, discharges for controlling described first switch-capacitor electric discharge according to described second control signal or controlling described second switch-capacitor according to described first control signal; Wherein, described first control signal and described second control signal are either-or selection control signal.
For achieving the above object, the utility model additionally provides a kind of power frequency change-over circuit, comprise: an integrating circuit, at least one first switch-capacitor and one second switch-capacitor, a comparer, a Logic control module and a capacitor charge and discharge control module described in the utility model, described integrating circuit comprises an integrating capacitor and an operational amplifier, the first input end of described operational amplifier is the input end of described power frequency change-over circuit, in order to receive a current signal to be converted, and its second input end grounding or connect a reference voltage source, its output terminal electricity is connected to the first input end of described comparer, between the first input end that described integrating capacitor is attempted by described operational amplifier and output terminal, the first input end of described comparer is connected with the output terminal electricity of described operational amplifier, its second input end is connected with a reference voltage source electricity, its output terminal electricity is connected to the input end of described Logic control module, and described comparer overturns for the level controlling its output terminal according to the comparative result of its first input end input voltage and the second input end input voltage, first output terminal electricity of described Logic control module is connected to described Access Control unit and the control of discharge unit of described capacitor charge and discharge control module, one first control signal is exported for the output level according to described comparer, make the first switch-capacitor described in described Access Control unit controls in parallel with described integrating capacitor and be combined into integrator with described operational amplifier to carry out integration to described current signal to be converted, make the second switch-capacitor described in described control of discharge unit controls discharge simultaneously, second output terminal electricity of described Logic control module is connected to described Access Control unit and the control of discharge unit of described capacitor charge and discharge control module, one second control signal is exported for the output level according to described comparer, make the second switch-capacitor described in described Access Control unit controls in parallel with described integrating capacitor and be combined into integrator with described operational amplifier to carry out integration to described current signal to be converted, make the first switch-capacitor described in described control of discharge unit controls discharge simultaneously, wherein, described first control signal and described second control signal are either-or selection control signal, 3rd output terminal of described Logic control module is the output terminal of described power frequency change-over circuit, for exporting the frequency signal after conversion.
The utility model has the advantage of: by power frequency change-over circuit, current signal is directly converted to the accessible square wave frequency signal of digital processing unit, circuit structure is simple, and precision is high, and cost is low; Because this utility model adopts two or more switch-capacitor, charging and discharging process hockets, therefore switch-capacitor can realize switching without time slot, when a switch-capacitor participates in integration, another switch-capacitor discharges, there is not the nonlinearity erron that capacitor discharge time deficiency is introduced, also reduce the requirement to the amplifier speed of response simultaneously.Further, because described Logic control module selects an output terminal to export control signal according to the output level of comparer automatically, therefore its inside is without the need to arranging timer control logic, and circuit realiration is fairly simple.
Accompanying drawing explanation
Fig. 1, the principle schematic of power frequency change-over circuit described in the utility model;
Fig. 2, the principle schematic of capacitor charge and discharge control module described in the utility model;
Fig. 3, the circuit diagram of power frequency change-over circuit first embodiment described in the utility model;
Fig. 4 is the working timing figure of the embodiment of circuit one shown in Fig. 3;
Fig. 5 is the working timing figure of another embodiment of circuit shown in Fig. 3;
Fig. 6, the circuit diagram of power frequency change-over circuit second embodiment described in the utility model;
Fig. 7, the circuit diagram of power frequency change-over circuit the 3rd embodiment described in the utility model;
Fig. 8, the circuit diagram of power frequency change-over circuit the 4th embodiment described in the utility model.
Embodiment
The capacitor charge and discharge control module provided the utility model below in conjunction with accompanying drawing and power frequency change-over circuit elaborate.
With reference to figure 1, the principle schematic of power frequency change-over circuit described in the utility model, described power frequency change-over circuit comprises: a capacitor charge and discharge control module 12, one integrating circuit, at least one first switch-capacitor C1 and one second switch-capacitor C2, a comparer A2 and a Logic control module 14; Wherein, described integrating circuit comprises operational amplifier A 1 and an integrating capacitor C0.
With reference to figure 2, the principle schematic of capacitor charge and discharge control module described in the utility model; Described capacitor charge and discharge control module 12 is applicable to the integrating circuit of power frequency change-over circuit, comprising: Access Control unit 22 and a control of discharge unit 24.Fig. 2 only illustrates the electric connection mode of Access Control unit 22 and control of discharge unit 24 and integrating capacitor C0, the first switch-capacitor C1, the second switch-capacitor C2, and is not used in the concrete relative position limiting Access Control unit 22 and control of discharge unit 24 and each electric capacity.
Described Access Control unit 22, in parallel with the integrating capacitor C0 in described integrating circuit for controlling the first switch-capacitor C1 according to one first control signal, or it is in parallel with integrating capacitor C0 to control the second switch-capacitor C2 according to one second control signal.Wherein, the first control signal and the second control signal are either-or selection control signal, and also namely synchronization only has a control signal to be effective control signal, and another control signal is invalid control signal.
Described control of discharge unit 24, discharges for controlling the first switch-capacitor C1 according to described second control signal, or discharges according to the described second switch-capacitor C2 of described first control signal control.
Also, namely, after described first switch-capacitor C1 is in parallel with described integrating capacitor C0, described second switch-capacitor C2 discharges; After described second switch-capacitor C2 is in parallel with described integrating capacitor C0, described first switch-capacitor C1 discharges.
As optional embodiment, described Access Control unit 22 comprises one first switch subelement 221 and a second switch subelement 222 further, first switch subelement 221 and second switch subelement 222 are turned on or off according to external control signal, and external control signal is the first control signal or the second control signal.Specifically, described first switch subelement 221 is electrically upper connects with described first switch-capacitor C1, in parallel with described integrating capacitor C0 for controlling described first switch-capacitor C1 according to the first control signal.Described second switch subelement 222 is electrically upper connects with described second switch-capacitor C2, in parallel with described integrating capacitor C0 for controlling described second switch-capacitor C2 according to the second control signal.As preferred embodiment, first control signal is the first clock control signal, second control signal is second clock control signal, described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase, also, when namely synchronization first switch subelement 221 and second switch subelement 222 only have one of them to be in conducting state, another is in off-state.
As optional embodiment, described control of discharge unit 24 comprises one the 3rd switch subelement 241 and one the 4th switch subelement 242 further, 3rd switch subelement 241 and the 4th switch subelement 242 are also for be turned on or off according to external control signal, and external control signal is the first control signal or the second control signal.Specifically, described 3rd switch subelement 241 is electrically upper in parallel with described first switch-capacitor C1, discharges for controlling described first switch-capacitor C1 according to described second control signal.Described 4th switch subelement 242 is electrically upper in parallel with described second switch-capacitor C2, discharges for controlling described second switch-capacitor C2 according to described first control signal.As preferred embodiment, first control signal is the first clock control signal, second control signal is second clock control signal, described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase, also, when namely synchronization the 3rd switch subelement 241 and the 4th switch subelement 242 only have one of them to be in conducting state, another is in off-state; And the first switch subelement 221 and the 4th switch subelement 242 all control by the first clock control signal, simultaneously conducting, to disconnect simultaneously, second switch subelement 222 and the 3rd switch subelement 241 all control by second clock control signal, simultaneously conducting, disconnect simultaneously.
Continue with reference to figure 1, the first input end of described operational amplifier A 1 is the input end of described power frequency change-over circuit, in order to receive a current signal I to be converted, its second input end grounding, its output terminal U1 electricity is connected to the first input end of described comparer A2.In other embodiments, the second input end of operational amplifier A 1 can receive its any reference voltage source that can accept in voltage range, and the reference voltage of this reference voltage source can be a certain fixed voltage or ground wire voltage.
Between the first input end that described integrating capacitor C0 is attempted by described operational amplifier A 1 and output terminal U1.It is periodically alternately in parallel with integrating capacitor C0 that capacitor charge and discharge control module 12 controls the first switch-capacitor C1 and one second switch-capacitor C2, thus make A1, C0 and C1 or C2 be combined into integrator, periodically carries out integration to described current signal I to be converted; Integration gained voltage V1 exports the first input end of described comparer A2 to.
The first input end of described comparer A2 is connected with the output terminal U1 electricity of described operational amplifier A 1, its second input end is connected with a reference voltage source VREF electricity, its output terminal U2 electricity is connected to the input end of described Logic control module 14, and described comparer A2 overturns for the level VO controlling its output terminal U2 according to the comparative result of its first input end input voltage and the second input end input voltage.Such as, when first input end input voltage is greater than the second input end input voltage, i.e. U
v1>U
vREFtime, it is low level that the level VO of output terminal U2 is overturn by high level, when first input end input voltage is less than the second input end input voltage, i.e. U
v1<U
vREFtime, it is high level that the level VO of output terminal is overturn by low level; Thus control the corresponding change of control signal of described Logic control module 14 output.
Arbitrary switch-capacitor C1 or C2 all redistributes electric charge with integrating capacitor C0 after accessing integrator, make the magnitude of voltage of comparer A2 first input end become electric charge redistribute after magnitude of voltage.Electric charge distributes formula: V1=VREFC0/ (C0+C1) or V1=VREFC0/ (C0+C2).When C1 with C2 capacitance is identical, redistribute the magnitude of voltage that electric charge obtains after arbitrary switch-capacitor C1 or C2 accesses integrator with integrating capacitor C0 all equal; Wherein, as C1=C2=C0, after redistributing electric charge, gained magnitude of voltage equals 1/2nd of reference voltage V REF; As C1=C2>C0, after redistributing electric charge, gained magnitude of voltage is less than 1/2nd of reference voltage V REF; As C1=C2<C0, after redistributing electric charge, gained magnitude of voltage is greater than 1/2nd of reference voltage V REF.When C1 with C2 capacitance is not identical, redistribute the magnitude of voltage that electric charge obtains after different switch-capacitor C1 or C2 accesses integrator with integrating capacitor C0 unequal, but still formula can be distributed according to above-mentioned electric charge and corresponding capacitance value pre-determines.
First output terminal of described Logic control module 14 respectively electricity is connected to described Access Control unit 22 and the control of discharge unit 24 of described capacitor charge and discharge control module 12, one first control signal is exported for the output level VO according to described comparer A2, make described Access Control unit 22 control described first switch-capacitor C1 in parallel with described integrating capacitor C0, the first switch-capacitor C1, integrating capacitor C0 and operational amplifier A 1 are combined into integrator and carry out integration to described current signal I to be converted; Simultaneously the first control signal makes described control of discharge unit 24 control described second switch-capacitor C2 to discharge.
Second output terminal of described Logic control module 14 respectively electricity is connected to described Access Control unit 22 and the control of discharge unit 24 of described capacitor charge and discharge control module 12, one second control signal is exported for the output level VO according to described comparer A2, make described Access Control unit 22 control described second switch-capacitor C2 in parallel with described integrating capacitor C0, the second switch-capacitor C2, integrating capacitor C0 and operational amplifier A 1 are combined into integrator and carry out integration to described current signal I to be converted; Simultaneously the second control signal makes described control of discharge unit 24 control described first switch-capacitor C1 to discharge.
Wherein, described first control signal and described second control signal are either-or selection control signal, and also namely synchronization only has a control signal to be effective control signal, and another control signal is invalid control signal.As optional embodiment, described first control signal is the first clock control signal, and described second control signal is second clock control signal, and described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase.
3rd output terminal of described Logic control module 14 is the output terminal of described power frequency change-over circuit, for exporting the frequency signal after conversion.
Specifically, when described Logic control module 14 sends the first control signal, in parallel with integrating capacitor C0 and form integrator with described operational amplifier A 1 by Access Control unit 22 after first switch-capacitor C1 disconnects with control of discharge unit 24, the second switch-capacitor C2 and integrator disconnect and access control of discharge unit 24 and discharge; Now the integrator output voltage V1 of C1, C0 and A1 composition is lower than reference voltage V REF, and the output level VO of comparer A2 is high level, and the to be converted current signal I of integrator to input carries out integration; When integration gained voltage V1 reaches reference voltage V REF, VO upset is low level, and now described Logic control module 14 sends the second control signal; When described Logic control module 14 sends the second control signal, in parallel with integrating capacitor C0 and form integrator with described operational amplifier A 1 by Access Control unit 22 after second switch-capacitor C2 disconnects with control of discharge unit 24, the first switch-capacitor C1 and integrator disconnect and access control of discharge unit 24 and discharge; When C2 and C0 carries out after electric charge redistributes, the integrator output voltage V1 of C2, C0 and A1 composition drops to lower than reference voltage V REF, and the output VO of comparer A2 overturns as high level, and the to be converted current signal I of integrator to input carries out integration; When integration gained voltage V1 reaches reference voltage V REF, VO upset is low level, and now described Logic control module 14 sends the first control signal; Interior the current signal I to be converted inputted duration, said process periodically repeats, thus the current signal I to be converted of input is converted into frequency signal output.
As preferred embodiment, the first switch-capacitor C1 is identical with the capacitance of the second switch-capacitor C2.When C1 with C2 capacitance is identical, redistribute the magnitude of voltage that electric charge obtains after arbitrary switch-capacitor C1 or C2 accesses integrator with integrating capacitor C0 all equal; Then integrator is also equal to the integral time of reference voltage V REF from this identical magnitude of voltage to described current signal I to be converted, thus described Logic control module 14 the 3rd output terminal export conversion after the frequency signal cycle identical.When C1 with C2 capacitance is not identical, redistribute the magnitude of voltage that electric charge obtains after different switch-capacitor C1 or C2 accesses integrator with integrating capacitor C0 unequal; Then integrator is unequal to the integral time of reference voltage V REF from different magnitude of voltage to described current signal I to be converted.Frequency dividing circuit can be increased before rate-adaptive pacemaker in unequal situation, to make last output signal for cycle equal frequency signal in integral time; If this frequency dividing circuit is frequency-halving circuit, the cycle of its output signal is two adjacent integration period sums that C1 and C2 accesses integrator respectively.After frequency-halving circuit frequency division, the frequency signal cycle after the conversion of output is identical.
Current signal is directly converted to the accessible frequency signal of digital processing unit by power frequency change-over circuit by the utility model, and circuit structure is simple, and precision is high, and cost is low; , there is not the nonlinearity erron that capacitor discharge is introduced in switch-capacitor seamless switching.And because described Logic control module selects an output terminal to export control signal according to the output level of comparer automatically, therefore its inside is without the need to arranging timer control logic, and controlling functions is fairly simple; And can seamless switching be realized according to control signal switch-capacitor, during one switch-capacitor work, another switch-capacitor discharges, without the need to delays time to control, therefore described Logic control module is inner without the need to arranging chronotron steering logic, its controlling functions of further simplification, also reduces the speed of response requirement to amplifier simultaneously.
Several embodiments of the power frequency change-over circuit that the utility model provides are provided, to be further explained explanation to the utility model below in conjunction with accompanying drawing.
Composition graphs 3-5, wherein, Fig. 3 is the circuit diagram of power frequency change-over circuit first embodiment described in the utility model, and Fig. 4 is the working timing figure of the embodiment of circuit one shown in Fig. 3, and Fig. 5 is the working timing figure of another embodiment of circuit shown in Fig. 3.
See Fig. 3, wherein, corresponding Φ 1 He indicated of each switch
represent its control signal received; Φ 1 He
be the not overlapping clock control signal of two-phase, produced by Logic control module 14; Voltage VREF is the reference voltage source provided by other circuit.
When circuit start, Φ 1 signal (the first clock control signal) that logic of propositions control module 14 exports effectively,
signal (second clock control signal) is invalid.The switch (the first switch subelement 221 and the 4th switch subelement 242) of all reception Φ 1 signals closes, all receptions
the switch (second switch subelement 222 and the 3rd switch subelement 241) of signal disconnects, and operational amplifier A 1 and electric capacity C0, C1 are combined into integrator, and under the effect of input current I, the output V1 of operational amplifier A 1 is from 0 to voltage VREF integration; It is high level that comparer A2 exports VO, and electric capacity C2 two terminal shortcircuit, its stored charge is 0.When V1 reaches voltage VREF, VO upset is low level, and second integration period starts; Now, Logic control module 14 exports
signal is effective, Φ 1 invalidating signal, and the switch (the first switch subelement 221 and the 4th switch subelement 242) of all reception Φ 1 signals disconnects, all receptions
the switch (second switch subelement 222 and the 3rd switch subelement 241) of signal closes; C2 accesses integrator, the electric charge on C2 and C0 mean allocation C0, and V1 voltage is declined from VREF, and VO upset is high level; Electric capacity C0, C2 and operational amplifier A 1 are combined into integrator, carry out integration to input current I from the magnitude of voltage after electric charge distribution to VREF.Integral charge simultaneously on electric capacity C1 is discharged, and the electric charge on final C1 is discharged into 0.When V1 reaches voltage VREF, VO upset is low level, and the 3rd integration period starts; Now, Φ 1 signal that exports of Logic control module 14 effectively,
invalidating signal.Interior the current signal I to be converted inputted duration, above-mentioned second integration period and the 3rd integration period alternately repeat, thus the current signal I to be converted of input is converted into frequency signal output.If the initial charge of integrating capacitor is that zero, first frequency corresponding to integration period is lower than the frequency corresponding to stable rear each cycle T when starting.
Work as C0, C1, C2 electric capacity value is identical when being C, and when circuit stability works, the work schedule of the power frequency change-over circuit shown in Fig. 3 is:
1, Φ 1 signal exported when Logic control module 14 effectively (being such as high level),
time invalidating signal (for low level), the switch of all reception Φ 1 signals is closed, all receptions
the switch of signal disconnects, operational amplifier A 1 and electric capacity C0, and C1 is combined into integrator, under the effect of input current I, the output V1 of operational amplifier A 1 is integration from VREF/2 to voltage VREF, and it is high level that comparer A2 exports VO, C2 electric capacity two terminal shortcircuit, its stored charge is 0.
2, when V1 reaches voltage VREF, comparer A2 exports VO upset for low level; Logic control module 14 exports
signal is (for high level), Φ 1 invalidating signal (for low level) effectively, and the switch of all reception Φ 1 signals disconnects, all receptions
the switch of signal closes; C2 accesses integrator, the electric charge on C2 and C0 mean allocation C0, makes V1 voltage drop to VREF/2 from VREF; Due to V1 voltage drop, VO upset is high level; Electric capacity C0, C2 and operational amplifier A 1 are combined into integrator, carry out integration to input current I from VREF/2 to VREF.Integral charge on electric capacity C1 is discharged, and the electric charge on final C1 is discharged into 0.
3, when V1 reaches voltage VREF again, VO upset is low level; Φ 1 signal that Logic control module 14 exports effective (for high level),
invalidating signal (for low level), all receptions
the switch of signal disconnects, and the switch of all reception Φ 1 signals closes; C1 accesses integrator, the electric charge on C1 and C0 mean allocation C0, makes V1 voltage drop to VREF/2 from VREF; Due to V1 voltage drop, VO upset is high level; Electric capacity C0, C1 and operational amplifier A 1 are combined into integrator, carry out integration to input current I from VREF/2 to VREF.Integral charge on electric capacity C2 is discharged, and the electric charge on final C2 is discharged into 0.
4, interior input current I duration, described power frequency change-over circuit repeats 2,3 liang of work schedules walked, and produces sawtooth wave at V1 end, produces square wave at VO end, thus input current is converted into square wave frequency output, and work schedule as shown in Figure 4.
The frequency of waveform is directly proportional to input current I, and power frequency transfer equation is:
When C1 and C2 electric capacity value is identical, and time different from C0, when circuit stability works, the work schedule of the power frequency change-over circuit shown in Fig. 3 is still above-mentioned sequential, work schedule still can with reference to figure 4, but stable after integration to start voltage be then other value between 0 to VREF except 0 and VREF and VREF/2.
Work as C0, C1, when C2 electric capacity value is not identical, when circuit stability works, the work schedule of the power frequency change-over circuit shown in Fig. 3 is still above-mentioned sequential, but the integration starting voltage value of integrator then differs and is decided to be VREF/2, and the periodicity of frequency dividing circuit (not shown in Fig. 3) guarantee output signal need be added.The present embodiment is for C1<C2, and now work schedule as shown in Figure 5.Integration starting voltage value when C1 accesses integrator in figure is VC1, integration period is that T1, C2 integration starting voltage value when accessing integrator is VC2, frequency signal cycle after integration period to be T2, T be conversion.
See Fig. 6-8, wherein Fig. 6 is the circuit diagram of power frequency change-over circuit second embodiment described in the utility model, Fig. 7 is the circuit diagram of power frequency change-over circuit the 3rd embodiment described in the utility model, Fig. 8 is the circuit diagram of power frequency change-over circuit the 4th embodiment described in the utility model, wherein, in each accompanying drawing, identical numbered component represents same or similar assembly.Switchgear distribution and the circuit connecting mode of the switch subelement of the inner Access Control unit 22 of shown capacitor charge and discharge control module and control of discharge unit 24 is with difference embodiment illustrated in fig. 3, shown in the principle of work of circuit shown in Fig. 6-8 and steering logic and Fig. 3, circuit is similar, does not repeat them here.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. a capacitor charge and discharge control module, is applicable to integrating circuit, it is characterized in that, comprising: an Access Control unit and a control of discharge unit;
Described Access Control unit, for controlling according to one first control signal, one first switch-capacitor is in parallel with the integrating capacitor in described integrating circuit or to control one second switch-capacitor according to one second control signal in parallel with described integrating capacitor;
Described control of discharge unit, discharges for controlling described first switch-capacitor electric discharge according to described second control signal or controlling described second switch-capacitor according to described first control signal;
Wherein, described first control signal and described second control signal are either-or selection control signal.
2. capacitor charge and discharge control module according to claim 1, is characterized in that, described Access Control unit comprises one first switch subelement and a second switch subelement further;
Described first switch subelement is electrically gone up and is connected with described first switch-capacitor, and in parallel with described integrating capacitor for controlling described first switch-capacitor according to described first control signal, described first control signal is one first clock control signal;
Described second switch subelement is electrically gone up and is connected with described second switch-capacitor, and in parallel with described integrating capacitor for controlling described second switch-capacitor according to described second control signal, described second control signal is a second clock control signal;
Wherein, described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase.
3. capacitor charge and discharge control module according to claim 1, is characterized in that, described control of discharge unit comprises one the 3rd switch subelement and one the 4th switch subelement further;
Described 3rd switch subelement is electrically gone up in parallel with described first switch-capacitor, and discharge for controlling described first switch-capacitor according to described second control signal, described second control signal is a second clock control signal;
Described 4th switch subelement is electrically gone up in parallel with described second switch-capacitor, and discharge for controlling described second switch-capacitor according to described first control signal, described first control signal is one first clock control signal;
Wherein, described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase.
4. capacitor charge and discharge control module according to claim 1, is characterized in that, described first switch-capacitor is identical with the capacitance of the second switch-capacitor.
5. a power frequency change-over circuit, is characterized in that, comprising: an integrating circuit, at least one first switch-capacitor and one second switch-capacitor, a comparer, a Logic control module and a capacitor charge and discharge control module according to claim 1,
Described integrating circuit comprises an integrating capacitor and an operational amplifier;
The first input end of described operational amplifier is the input end of described power frequency change-over circuit, in order to receive a current signal to be converted, and its second input end grounding or connect a reference voltage source, its output terminal electricity is connected to the first input end of described comparer;
Between the first input end that described integrating capacitor is attempted by described operational amplifier and output terminal;
The first input end of described comparer is connected with the output terminal electricity of described operational amplifier, its second input end is connected with a reference voltage source electricity, its output terminal electricity is connected to the input end of described Logic control module, and described comparer overturns for the level controlling its output terminal according to the comparative result of its first input end input voltage and the second input end input voltage;
First output terminal electricity of described Logic control module is connected to described Access Control unit and the control of discharge unit of described capacitor charge and discharge control module, one first control signal is exported for the output level according to described comparer, make the first switch-capacitor described in described Access Control unit controls in parallel with described integrating capacitor and be combined into integrator with described operational amplifier to carry out integration to described current signal to be converted, make the second switch-capacitor described in described control of discharge unit controls discharge simultaneously;
Second output terminal electricity of described Logic control module is connected to described Access Control unit and the control of discharge unit of described capacitor charge and discharge control module, one second control signal is exported for the output level according to described comparer, make the second switch-capacitor described in described Access Control unit controls in parallel with described integrating capacitor and be combined into integrator with described operational amplifier to carry out integration to described current signal to be converted, make the first switch-capacitor described in described control of discharge unit controls discharge simultaneously, wherein, described first control signal and described second control signal are either-or selection control signal,
3rd output terminal of described Logic control module is the output terminal of described power frequency change-over circuit, for exporting the frequency signal after conversion.
6. power frequency change-over circuit according to claim 5, is characterized in that, described Access Control unit comprises one first switch subelement and a second switch subelement further;
Described first switch subelement is electrically gone up and is connected with described first switch-capacitor, and in parallel with described integrating capacitor for controlling described first switch-capacitor according to described first control signal, described first control signal is one first clock control signal;
Described second switch subelement is electrically gone up and is connected with described second switch-capacitor, and in parallel with described integrating capacitor for controlling described second switch-capacitor according to described second control signal, described second control signal is a second clock control signal; Wherein, described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase.
7. power frequency change-over circuit according to claim 5, is characterized in that, described control of discharge unit comprises one the 3rd switch subelement and one the 4th switch subelement further;
Described 3rd switch subelement is electrically gone up in parallel with described first switch-capacitor, and discharge for controlling described first switch-capacitor according to described second control signal, described second control signal is a second clock control signal;
Described 4th switch subelement is electrically gone up in parallel with described second switch-capacitor, and discharge for controlling described second switch-capacitor according to described first control signal, described first control signal is one first clock control signal;
Wherein, described first clock control signal and described second clock control signal are the not overlapping clock control signal of two-phase.
8. power frequency change-over circuit according to claim 5, is characterized in that, described first switch-capacitor is identical with the capacitance of the second switch-capacitor.
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| CN201520362193.5U CN204666166U (en) | 2015-05-29 | 2015-05-29 | Capacitor charge and discharge control module and power frequency change-over circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289333A (en) * | 2015-05-29 | 2017-01-04 | 苏州坤元微电子有限公司 | Capacitor charge and discharge control module and power frequency change-over circuit |
| CN112491418A (en) * | 2020-11-19 | 2021-03-12 | 垣矽技术(青岛)有限公司 | Current frequency conversion circuit |
| CN112857408A (en) * | 2021-03-10 | 2021-05-28 | 北京同芯科技有限公司 | High-reliability current frequency conversion circuit |
-
2015
- 2015-05-29 CN CN201520362193.5U patent/CN204666166U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289333A (en) * | 2015-05-29 | 2017-01-04 | 苏州坤元微电子有限公司 | Capacitor charge and discharge control module and power frequency change-over circuit |
| CN106289333B (en) * | 2015-05-29 | 2019-01-25 | 苏州坤元微电子有限公司 | Capacitor charge and discharge control module and power frequency conversion circuit |
| CN112491418A (en) * | 2020-11-19 | 2021-03-12 | 垣矽技术(青岛)有限公司 | Current frequency conversion circuit |
| CN112857408A (en) * | 2021-03-10 | 2021-05-28 | 北京同芯科技有限公司 | High-reliability current frequency conversion circuit |
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