CN203775300U - Electric current loop control circuit suitable for camera - Google Patents
Electric current loop control circuit suitable for camera Download PDFInfo
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- CN203775300U CN203775300U CN201320684466.9U CN201320684466U CN203775300U CN 203775300 U CN203775300 U CN 203775300U CN 201320684466 U CN201320684466 U CN 201320684466U CN 203775300 U CN203775300 U CN 203775300U
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Abstract
The utility model discloses an electric current loop control circuit suitable for a camera. The control circuit comprises a DC power supply, a current detection circuit, and a slope compensation circuit. The current detection circuit comprises a first detection circuit, a second detection circuit, an I-V conversion circuit, a first comparator, and a control switch. The slope compensation circuit comprises a self-adaption current generation circuit, a sawtooth wave generation circuit, and a V-I conversion circuit. In comparison with traditional electric current loop control circuits which adopt methods of connecting a MOS tube in parallel or connecting a resistor in series for current detection, the electric current loop control circuit provided by the utility model increases the precision of current detection and reduces the circuit power consumption; and in comparison with traditional slope compensation circuits, the slope compensation circuit of the utility model realizes the self-adaption slope compensation and prevents an excessive compensation problem in a traditional compensation method. At the same time, the electric current loop control circuit completes the addition of a detection signal and a compensation signal, and the electric current loop control circuit can be directly applied to the electric current loop control of the camera.
Description
Technical field
The utility model relates to a kind of current loop control circuit, relates in particular to a kind of current loop control circuit that is applicable to video camera.
Background technology
Video camera has increased a current loop control circuit, thereby has dynamic responding speed faster, and more easily realizes stabiloity compensation, and therefore application is more extensive at present.The major function of electric current loop is to detect the size of output current, testing result is fed back to relatively device of pulse duration fast, thereby have the result of comparator to adjust fast output, ensures the stable of output voltage.But in the current loop course of work, there is an important problem, the unsteadiness of loop in the time that duty ratio is greater than 50%, therefore needs to add slope equalizer.
Conventional electric current detecting method comprises series connected resistance, paralleling MOS pipe method, and the long-pending grading mode of inductive current.But they have certain drawback.
Series connected resistance is the little resistance of connecting on output current passage, thereby then realizes the object of current detecting with the voltage at current sense amplifier detection resistance two ends.The drawback of this method is that the accuracy of series resistance is difficult to ensure, the extra power consumption of series resistance consumption simultaneously, and this will become particularly serious in the time that load current is larger.
For the slope-compensation of loop, conventional slope compensation method is that the result of a fixing sawtooth waveforms and current detecting is superposeed at present in addition.Although the drawback of this method is the stability of loop while having ensured worst case, but there is in other cases the problem of overcompensation, thereby cause reducing of output current, and make total tend to voltage mode, lost the advantage of current-mode itself.
Consider the drawback of conventional electric current detecting method already pointed out and slope compensation method, need to design new circuit structure with ensure current loop control circuit precisely, low-power consumption and stable work.
Utility model content
The purpose of this utility model is just to provide in order to address the above problem a kind of current loop control circuit control circuit that is applicable to video camera.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises DC power supply, current detection circuit and slope equalizer, described current detection circuit comprises the first testing circuit, the second testing circuit, I-V change-over circuit, the first comparator and control switch, described the first testing circuit, described the second testing circuit, described I-V change-over circuit, after described the first comparator and described control switch are parallel with one another, its input is connected with the cathode output end of described DC power supply, its output is connected with the negative input of described DC power supply, described slope equalizer comprises that self-adaptive current produces circuit, sawtooth wave generating circuit and V-I change-over circuit, described self-adaptive current produces circuit, described sawtooth wave generating circuit and described V-I change-over circuit are connected in series, its input is connected with the cathode output end of described DC power supply, its output is connected with the cathode output end of described DC power supply.
Further, described the first testing circuit comprises the 26 metal-oxide-semiconductor, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 12 metal-oxide-semiconductor and the 13 metal-oxide-semiconductor, described the first testing circuit is by the first analog switch group control, described the first analog switch group comprises the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, the cathode output end of described DC power supply is connected with the drain electrode of described the 26 metal-oxide-semiconductor, the source electrode of described the 26 metal-oxide-semiconductor is connected with the source electrode of described the 4th metal-oxide-semiconductor, the drain electrode of described the 4th metal-oxide-semiconductor is connected with the drain electrode of described the second metal-oxide-semiconductor and the drain electrode of described the 5th metal-oxide-semiconductor respectively, the grid of described the second metal-oxide-semiconductor respectively with the grid of described the first metal-oxide-semiconductor, the source electrode of described the second metal-oxide-semiconductor is connected with the source electrode of the 13 metal-oxide-semiconductor, the source electrode of described the first metal-oxide-semiconductor is connected with the source electrode of described the 12 metal-oxide-semiconductor, the drain electrode of described the 12 metal-oxide-semiconductor is connected with described the 13 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the grid of described the 3rd metal-oxide-semiconductor respectively with the first comparator output voltage terminal, the grid of described the 4th metal-oxide-semiconductor, the grid of described the 5th metal-oxide-semiconductor connects, the grid of described the 12 metal-oxide-semiconductor is connected with the grid of described the 13 metal-oxide-semiconductor.
Further, described the second testing circuit comprises the first resistor, the second resistor, the 3rd resistor, the 27 metal-oxide-semiconductor, the 9th metal-oxide-semiconductor, the tenth metal-oxide-semiconductor, the 14 metal-oxide-semiconductor and the 15 metal-oxide-semiconductor, described the second testing circuit is by the second analog switch group control, described the second analog switch group comprises the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor and the 8th metal-oxide-semiconductor, the cathode output end of described DC power supply is connected with the drain electrode of described the 6th metal-oxide-semiconductor and the drain electrode of the 7th metal-oxide-semiconductor respectively, described in the source series of described the 6th metal-oxide-semiconductor, after the first resistor, be connected with the drain electrode of described the 27 metal-oxide-semiconductor and the first end of described the second resistor respectively, the source electrode of described the 27 metal-oxide-semiconductor is connected with the source electrode of described the 3rd metal-oxide-semiconductor, the second end of described the second resistor is connected with the drain electrode of described the 9th metal-oxide-semiconductor, described in the source series of described the 7th metal-oxide-semiconductor, after the 3rd resistor, be connected with the drain electrode of described the tenth metal-oxide-semiconductor and the drain electrode of described the 8th metal-oxide-semiconductor respectively, the grid of described the tenth metal-oxide-semiconductor respectively with the grid of described the 9th metal-oxide-semiconductor, the source electrode of described the tenth metal-oxide-semiconductor is connected with the source electrode of described the 15 metal-oxide-semiconductor, the source electrode of described the 9th metal-oxide-semiconductor is connected with the source electrode of described the 14 metal-oxide-semiconductor and the source electrode of described the first metal-oxide-semiconductor respectively, the grid of described the 14 metal-oxide-semiconductor is connected with described the 15 grid of metal-oxide-semiconductor and the grid of described the 13 metal-oxide-semiconductor respectively, the drain electrode of described the 14 metal-oxide-semiconductor is connected with described the 15 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the grid of described the 6th metal-oxide-semiconductor respectively with the grid of described the 7th metal-oxide-semiconductor, the grid of the 8th metal-oxide-semiconductor is connected with described the first comparator output voltage terminal.
Further, described I-V change-over circuit comprises the 16 metal-oxide-semiconductor and the 4th resistor, the drain electrode of described the 16 metal-oxide-semiconductor is connected with the source electrode of described the 8th metal-oxide-semiconductor and the source electrode of described the 5th metal-oxide-semiconductor respectively, the grid of described the 16 metal-oxide-semiconductor is connected with the source electrode of described the 9th metal-oxide-semiconductor, the source electrode of described the 16 metal-oxide-semiconductor respectively with the normal phase input end of described the first comparator, the first end of described the 4th resistor is connected with detecting voltage end, the second end of described the 4th resistor is connected with the cathode output end of described DC power supply, the inverting input of described the first comparator is connected with reference voltage terminal, the signal output part of described the first comparator is connected with described the first comparator output voltage terminal.
Further, described control switch comprises the first switch MOS pipe, second switch metal-oxide-semiconductor, the 11 metal-oxide-semiconductor, bias current sources and switch, described first drain electrode of switch MOS pipe and the cathode output end of described DC power supply are connected, the grid of described the first switch MOS pipe respectively with the control voltage switch of described the first switch MOS pipe, the grid of described the 26 metal-oxide-semiconductor is connected with the grid of described the 27 metal-oxide-semiconductor, the source electrode of described the first switch MOS pipe respectively with described switch, the source electrode of described the 3rd metal-oxide-semiconductor is connected with the source electrode of described second switch metal-oxide-semiconductor, the grid of described second switch metal-oxide-semiconductor is connected with the control voltage switch of described second switch metal-oxide-semiconductor, the drain electrode of described second switch metal-oxide-semiconductor is connected with described the 11 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the source electrode of described the 11 metal-oxide-semiconductor respectively with the grid of described the 11 metal-oxide-semiconductor, described the 12 grid of metal-oxide-semiconductor and the output of described bias current sources are connected.
Further, described self-adaptive current produces circuit and comprises the second comparator, amplifier, the 6th resistor, the 7th resistor, the 8th resistor, the 17 metal-oxide-semiconductor and capacitor, the cathode output end of described DC power supply is connected after described the 6th resistor respectively and the first end of described the 7th resistor, the normal phase input end of described the second comparator is connected with the normal phase input end of described amplifier, the inverting input of described the second comparator is connected after described the 8th resistor and is connected with described the 17 source electrode of metal-oxide-semiconductor and the inverting input of described amplifier respectively, the signal output part of described the second comparator is connected with the negative input of described amplifier, described the 17 grid of metal-oxide-semiconductor and the signal output part of described amplifier are connected, described the 17 drain electrode of metal-oxide-semiconductor and the first end of described capacitor are connected, the second end of described capacitor is connected with the cathode output end of described DC power supply and the second end of described the 7th resistor respectively.
Further, described sawtooth wave generating circuit comprises the 18 metal-oxide-semiconductor, the 19 metal-oxide-semiconductor.The 20 metal-oxide-semiconductor, the 21 metal-oxide-semiconductor, the source electrode of described the 20 metal-oxide-semiconductor respectively with the first end of described capacitor, the drain electrode of described the 18 metal-oxide-semiconductor is connected with the drain electrode of described the 19 metal-oxide-semiconductor, the source electrode of described the 18 metal-oxide-semiconductor is connected with described the 21 source electrode of metal-oxide-semiconductor and the source electrode of described the 19 metal-oxide-semiconductor respectively, the grid of described the 20 metal-oxide-semiconductor is connected with described the 19 grid of metal-oxide-semiconductor and the grid of described the 21 metal-oxide-semiconductor respectively, the drain electrode of described the 20 metal-oxide-semiconductor is connected with described the 21 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the grid of described the 18 metal-oxide-semiconductor is the input of sawtooth waveforms, the grid of described the 19 metal-oxide-semiconductor is the output of sawtooth waveforms.
Further, described V-I change-over circuit comprises the 22 metal-oxide-semiconductor, the 23 metal-oxide-semiconductor, the 24 metal-oxide-semiconductor, the 25 metal-oxide-semiconductor and the 9th resistor, the grid of described the 22 metal-oxide-semiconductor is connected with the source electrode of described the 21 metal-oxide-semiconductor, the source electrode of described the 22 metal-oxide-semiconductor respectively with the source electrode of described the 23 metal-oxide-semiconductor, the grid of described the 23 metal-oxide-semiconductor is connected with the grid of described the 24 metal-oxide-semiconductor, the drain electrode of described the 23 metal-oxide-semiconductor is connected with the drain electrode of described the 24 metal-oxide-semiconductor, the source electrode of described the 24 metal-oxide-semiconductor is connected with the source electrode of described reference voltage terminal and described the 25 metal-oxide-semiconductor respectively, the grid of described the 25 metal-oxide-semiconductor is connected with described VB end, the drain electrode of described the 25 metal-oxide-semiconductor is connected with the second end of described the 9th resistor and the drain electrode of described the 21 metal-oxide-semiconductor respectively.
The beneficial effects of the utility model are:
The utility model provides a kind of current loop control circuit of video camera, and than paralleling MOS tube current detection method and series resistance electric current testing in traditional current loop control circuit, the utility model has increased the precision of current detecting, has reduced circuit power consumption; Contrast traditional slope equalizer, the utility model is realized adaptative slope compensation, has avoided the overcompensation problem in conventional compensation approach.Meanwhile, in the utility model, complete detection signal and compensating signal and be added, can directly apply in the current loop control of video camera.
Brief description of the drawings
Fig. 1 is the circuit diagram of current detection circuit described in the utility model;
Fig. 2 is the circuit diagram of slope equalizer described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Embodiment mono-: as depicted in figs. 1 and 2, the utility model comprises DC power supply, current detection circuit and slope equalizer, current detection circuit comprises the first testing circuit, the second testing circuit, I-V change-over circuit, the first comparator and control switch, the first testing circuit, the second testing circuit, I-V change-over circuit, after the first comparator C OMP1 and control switch are parallel with one another, its input is connected with the cathode output end of DC power supply, its output is connected with the negative input of DC power supply, slope equalizer comprises that self-adaptive current produces circuit, sawtooth wave generating circuit and V-I change-over circuit, self-adaptive current produces circuit, sawtooth wave generating circuit and V-I change-over circuit are connected in series, its input is connected with the cathode output end of DC power supply, its output is connected with the cathode output end of DC power supply, the first testing circuit comprises the 26 metal-oxide-semiconductor MS1, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 12 metal-oxide-semiconductor M12 and the 13 metal-oxide-semiconductor M13, the first testing circuit is by the first analog switch group control, the first analog switch group comprises the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor M5, the cathode output end of DC power supply is connected with the drain electrode of the 26 metal-oxide-semiconductor MS1, the source electrode of the 26 metal-oxide-semiconductor MS1 is connected with the source electrode of the 4th metal-oxide-semiconductor M4, the drain electrode of the 4th metal-oxide-semiconductor M4 is connected with the drain electrode of the second metal-oxide-semiconductor M2 and the drain electrode of the 5th metal-oxide-semiconductor M5 respectively, the grid of the second metal-oxide-semiconductor M2 respectively with the grid of the first metal-oxide-semiconductor M1, the source electrode of the second metal-oxide-semiconductor M2 is connected with the source electrode of the 13 metal-oxide-semiconductor M13, the source electrode of the first metal-oxide-semiconductor M1 is connected with the source electrode of the 12 metal-oxide-semiconductor M12, the drain electrode of the 12 metal-oxide-semiconductor M12 is connected with the 13 drain electrode of metal-oxide-semiconductor M13 and the cathode output end of DC power supply respectively, the grid of the 3rd metal-oxide-semiconductor M3 respectively with the first comparator C OMP1 output voltage terminal, the grid of the 4th metal-oxide-semiconductor M4, the grid of the 5th metal-oxide-semiconductor M5 connects, the grid of the 12 metal-oxide-semiconductor M12 is connected with the grid of the 13 metal-oxide-semiconductor M13, the second testing circuit comprises the first resistor R1, the second resistor R2, the 3rd resistor R3, the 27 metal-oxide-semiconductor MS2, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 14 metal-oxide-semiconductor M14 and the 15 metal-oxide-semiconductor M15, the second testing circuit is by the second analog switch group control, the second analog switch group comprises the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7 and the 8th metal-oxide-semiconductor M8, the cathode output end of DC power supply is connected with the drain electrode of the 6th metal-oxide-semiconductor M6 and the drain electrode of the 7th metal-oxide-semiconductor M7 respectively, after source series the first resistor R1 of the 6th metal-oxide-semiconductor M6, be connected with the drain electrode of the 27 metal-oxide-semiconductor MS1 and the first end of the second resistor R2 respectively, the source electrode of the 27 metal-oxide-semiconductor MS1 is connected with the source electrode of the 3rd metal-oxide-semiconductor M3, the second end of the second resistor R2 is connected with the drain electrode of the 9th metal-oxide-semiconductor M9, after the source series of the 7th metal-oxide-semiconductor M7 the 3rd resistor R3, be connected with the drain electrode of the tenth metal-oxide-semiconductor M10 and the drain electrode of the 8th metal-oxide-semiconductor M8 respectively, the grid of the tenth metal-oxide-semiconductor M10 respectively with the grid of the 9th metal-oxide-semiconductor M9, the source electrode of the tenth metal-oxide-semiconductor M10 is connected with the source electrode of the 15 metal-oxide-semiconductor M15, the source electrode of the 9th metal-oxide-semiconductor M9 is connected with the source electrode of the 14 metal-oxide-semiconductor M14 and the source electrode of the first metal-oxide-semiconductor M1 respectively, the grid of the 14 metal-oxide-semiconductor M14 is connected with the 15 grid of metal-oxide-semiconductor M15 and the grid of the 13 metal-oxide-semiconductor M13 respectively, the drain electrode of the 14 metal-oxide-semiconductor M14 is connected with the 15 drain electrode of metal-oxide-semiconductor M15 and the cathode output end of DC power supply respectively, the grid of the 6th metal-oxide-semiconductor M6 respectively with the grid of the 7th metal-oxide-semiconductor M7, the grid of the 8th metal-oxide-semiconductor M8 is connected with the first comparator C OMP1 output voltage terminal, I-V change-over circuit comprises the 16 metal-oxide-semiconductor M16 and the 4th resistor R4, the drain electrode of the 16 metal-oxide-semiconductor M16 is connected with the source electrode of the 8th metal-oxide-semiconductor M8 and the source electrode of the 5th metal-oxide-semiconductor M5 respectively, the grid of the 16 metal-oxide-semiconductor M16 is connected with the source electrode of the 9th metal-oxide-semiconductor M9, the source electrode of the 16 metal-oxide-semiconductor M16 respectively with the normal phase input end of the first comparator C OMP1, the first end of the 4th resistor R4 is connected with detecting voltage end VSEN, the second end of the 4th resistor R4 is connected with the cathode output end of DC power supply, the inverting input of the first comparator C OMP1 is connected with reference voltage terminal Ref, the signal output part of described the first comparator C OMP1 is connected with described the first comparator C OMP1 output voltage terminal Q, control switch comprises the first switch MOS pipe MP, second switch metal-oxide-semiconductor MN, the 11 metal-oxide-semiconductor M11, bias current sources Ibias and switch SW, the drain electrode of the first switch MOS pipe MP is connected with the cathode output end of DC power supply, the grid of the first switch MOS pipe MP respectively with the control voltage switch Vp of the first switch MOS pipe MP, the grid of the 26 metal-oxide-semiconductor MS1 is connected with the grid of the 27 metal-oxide-semiconductor MS2, the source electrode of the first switch MOS pipe MP respectively with switch SW, the source electrode of the 3rd metal-oxide-semiconductor M3 is connected with the source electrode of second switch metal-oxide-semiconductor MN, the grid of second switch metal-oxide-semiconductor MN is connected with the control voltage switch Vn of second switch metal-oxide-semiconductor MN, the drain electrode of second switch metal-oxide-semiconductor MS is connected with the 11 drain electrode of metal-oxide-semiconductor M11 and the cathode output end of DC power supply respectively, the source electrode of the 11 metal-oxide-semiconductor M11 respectively with the grid of the 11 metal-oxide-semiconductor M11, the grid of the 12 metal-oxide-semiconductor M12 is connected with the output of bias current sources Ibias, self-adaptive current produces circuit and comprises the second comparator C OMP2, amplifier AMP, the 6th resistor R6, the 7th resistor R7, the 8th resistor R8, the 17 metal-oxide-semiconductor M17 and capacitor C, after cathode output end series connection the 6th resistor R6 of DC power supply respectively with the first end of the 7th resistor R7, the normal phase input end of the second comparator C OMP2 is connected with the normal phase input end of amplifier AMP, after inverting input series connection the 8th resistor R8 of the second comparator C OMP2, be connected with the source electrode of the 17 metal-oxide-semiconductor M17 and the inverting input of amplifier AMP respectively, the signal output part of the second comparator C OMP2 is connected with the negative input of amplifier AMP, the grid of the 17 metal-oxide-semiconductor M17 is connected with the signal output part of amplifier AMP, the drain electrode of the 17 metal-oxide-semiconductor M17 is connected with the first end of capacitor C, the second end of capacitor C is connected with the cathode output end of DC power supply and the second end of the 7th resistor R7 respectively, sawtooth wave generating circuit comprises the 18 metal-oxide-semiconductor M18, the 19 metal-oxide-semiconductor M19, the 20 metal-oxide-semiconductor M20, the 21 metal-oxide-semiconductor M21, the source electrode of the 20 metal-oxide-semiconductor M20 respectively with the first end of capacitor C, the drain electrode of the 18 metal-oxide-semiconductor M18 is connected with the drain electrode of the 19 metal-oxide-semiconductor M19, the source electrode of the 18 metal-oxide-semiconductor M18 is connected with the 21 source electrode of metal-oxide-semiconductor M21 and the source electrode of the 19 metal-oxide-semiconductor M19 respectively, the grid of the 20 metal-oxide-semiconductor M20 is connected with the 19 grid of metal-oxide-semiconductor M19 and the grid of the 21 metal-oxide-semiconductor M21 respectively, the drain electrode of the 20 metal-oxide-semiconductor M20 is connected with the 21 drain electrode of metal-oxide-semiconductor M21 and the cathode output end of DC power supply respectively, the grid of the 18 metal-oxide-semiconductor M18 is the input OSCB of sawtooth waveforms, the grid of the 19 metal-oxide-semiconductor M19 is the output OSC of sawtooth waveforms, V-I change-over circuit comprises the 22 metal-oxide-semiconductor M22, the 23 metal-oxide-semiconductor M23, the 24 metal-oxide-semiconductor M24, the 25 metal-oxide-semiconductor M25 and the 9th resistor R9, the grid of the 22 metal-oxide-semiconductor M22 is connected with the source electrode of the 21 metal-oxide-semiconductor M21, the source electrode of the 22 metal-oxide-semiconductor M22 respectively with the source electrode of the 23 metal-oxide-semiconductor M23, the grid of the 23 metal-oxide-semiconductor M23 is connected with the grid of the 24 metal-oxide-semiconductor M24, the drain electrode of the 23 metal-oxide-semiconductor M23 is connected with the drain electrode of the 24 metal-oxide-semiconductor M24, the source electrode of the 24 metal-oxide-semiconductor M24 is connected with the source electrode of reference voltage terminal ner0 and the 25 metal-oxide-semiconductor M25 respectively, the grid of the 25 metal-oxide-semiconductor M25 is connected with the 25 metal-oxide-semiconductor M25 reference voltage terminal VB, the drain electrode of the 25 metal-oxide-semiconductor M25 is connected with the second end of the 9th resistor R9 and the drain electrode of the 21 metal-oxide-semiconductor M21 respectively.
Those skilled in the art do not depart from essence of the present utility model and spirit, can there is various deformation scheme to realize the utility model, the foregoing is only the better feasible embodiment of the utility model, this technology can be applied in other packagings, not thereby limit to interest field of the present utility model, the equivalent structure that all utilization the utility model specifications and accompanying drawing content are done changes or is applied to other packagings above, within being all contained in interest field of the present utility model.
Claims (8)
1. one kind is applicable to the current loop control circuit of video camera, it is characterized in that: comprise DC power supply, current detection circuit and slope equalizer, described current detection circuit comprises the first testing circuit, the second testing circuit, I-V change-over circuit, the first comparator and control switch, described the first testing circuit, described the second testing circuit, described I-V change-over circuit, after described the first comparator and described control switch are parallel with one another, its input is connected with the cathode output end of described DC power supply, its output is connected with the negative input of described DC power supply, described slope equalizer comprises that self-adaptive current produces circuit, sawtooth wave generating circuit and V-I change-over circuit, described self-adaptive current produces circuit, described sawtooth wave generating circuit and described V-I change-over circuit are connected in series, its input is connected with the cathode output end of described DC power supply, its output is connected with the cathode output end of described DC power supply.
2. a kind of current loop control circuit that is applicable to video camera according to claim 1, it is characterized in that: described the first testing circuit comprises the 26 metal-oxide-semiconductor, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 12 metal-oxide-semiconductor and the 13 metal-oxide-semiconductor, described the first testing circuit is by the first analog switch group control, described the first analog switch group comprises the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor, the cathode output end of described DC power supply is connected with the drain electrode of described the 26 metal-oxide-semiconductor, the source electrode of described the 26 metal-oxide-semiconductor is connected with the source electrode of described the 4th metal-oxide-semiconductor, the drain electrode of described the 4th metal-oxide-semiconductor is connected with the drain electrode of described the second metal-oxide-semiconductor and the drain electrode of described the 5th metal-oxide-semiconductor respectively, the grid of described the second metal-oxide-semiconductor respectively with the grid of described the first metal-oxide-semiconductor, the source electrode of described the second metal-oxide-semiconductor is connected with the source electrode of the 13 metal-oxide-semiconductor, the source electrode of described the first metal-oxide-semiconductor is connected with the source electrode of described the 12 metal-oxide-semiconductor, the drain electrode of described the 12 metal-oxide-semiconductor is connected with described the 13 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the grid of described the 3rd metal-oxide-semiconductor respectively with the first comparator output voltage terminal, the grid of described the 4th metal-oxide-semiconductor, the grid of described the 5th metal-oxide-semiconductor connects, the grid of described the 12 metal-oxide-semiconductor is connected with the grid of described the 13 metal-oxide-semiconductor.
3. a kind of current loop control circuit that is applicable to video camera according to claim 2, it is characterized in that: described the second testing circuit comprises the first resistor, the second resistor, the 3rd resistor, the 27 MOS pipe, the 9th metal-oxide-semiconductor, the tenth metal-oxide-semiconductor, the 14 metal-oxide-semiconductor and the 15 metal-oxide-semiconductor, described the second testing circuit is by the second analog switch group control, described the second analog switch group comprises the 6th metal-oxide-semiconductor, the 7th metal-oxide-semiconductor and the 8th metal-oxide-semiconductor, the cathode output end of described DC power supply is connected with the drain electrode of described the 6th metal-oxide-semiconductor and the drain electrode of the 7th metal-oxide-semiconductor respectively, described in the source series of described the 6th metal-oxide-semiconductor, after the first resistor, be connected with the drain electrode of described the 27 metal-oxide-semiconductor and the first end of described the second resistor respectively, the source electrode of described the 27 metal-oxide-semiconductor is connected with the source electrode of described the 3rd metal-oxide-semiconductor, the second end of described the second resistor is connected with the drain electrode of described the 9th metal-oxide-semiconductor, described in the source series of described the 7th metal-oxide-semiconductor, after the 3rd resistor, be connected with the drain electrode of described the tenth metal-oxide-semiconductor and the drain electrode of described the 8th metal-oxide-semiconductor respectively, the grid of described the tenth metal-oxide-semiconductor respectively with the grid of described the 9th metal-oxide-semiconductor, the source electrode of described the tenth metal-oxide-semiconductor is connected with the source electrode of described the 15 metal-oxide-semiconductor, the source electrode of described the 9th metal-oxide-semiconductor is connected with the source electrode of described the 14 metal-oxide-semiconductor and the source electrode of described the first metal-oxide-semiconductor respectively, the grid of described the 14 metal-oxide-semiconductor is connected with described the 15 grid of metal-oxide-semiconductor and the grid of described the 13 metal-oxide-semiconductor respectively, the drain electrode of described the 14 metal-oxide-semiconductor is connected with described the 15 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the grid of described the 6th metal-oxide-semiconductor respectively with the grid of described the 7th metal-oxide-semiconductor, the grid of the 8th metal-oxide-semiconductor is connected with described the first comparator output voltage terminal.
4. a kind of current loop control circuit that is applicable to video camera according to claim 3, it is characterized in that: described I-V change-over circuit comprises the 16 metal-oxide-semiconductor and the 4th resistor, the drain electrode of described the 16 metal-oxide-semiconductor is connected with the source electrode of described the 8th metal-oxide-semiconductor and the source electrode of described the 5th metal-oxide-semiconductor respectively, the grid of described the 16 metal-oxide-semiconductor is connected with the source electrode of described the 9th metal-oxide-semiconductor, the source electrode of described the 16 metal-oxide-semiconductor respectively with the normal phase input end of described the first comparator, the first end of described the 4th resistor is connected with detecting voltage end, the second end of described the 4th resistor is connected with the cathode output end of described DC power supply, the inverting input of described the first comparator is connected with reference voltage terminal, the signal output part of described the first comparator is connected with described the first comparator output voltage terminal.
5. a kind of current loop control circuit that is applicable to video camera according to claim 3, it is characterized in that: described control switch comprises the first switch MOS pipe, second switch metal-oxide-semiconductor, the 11 metal-oxide-semiconductor, bias current sources and switch, described first drain electrode of switch MOS pipe and the cathode output end of described DC power supply are connected, the grid of described the first switch MOS pipe respectively with the control voltage switch of described the first switch MOS pipe, the grid of described the 26 metal-oxide-semiconductor is connected with the grid of described the 27 metal-oxide-semiconductor, the source electrode of described the first switch MOS pipe respectively with described switch, the source electrode of described the 3rd metal-oxide-semiconductor is connected with the source electrode of described second switch metal-oxide-semiconductor, the grid of described second switch metal-oxide-semiconductor is connected with the control voltage switch of described second switch metal-oxide-semiconductor, the drain electrode of described second switch metal-oxide-semiconductor is connected with described the 11 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the source electrode of described the 11 metal-oxide-semiconductor respectively with the grid of described the 11 metal-oxide-semiconductor, described the 12 grid of metal-oxide-semiconductor and the output of described bias current sources are connected.
6. a kind of current loop control circuit that is applicable to video camera according to claim 1, it is characterized in that: described self-adaptive current produces circuit and comprises the second comparator, amplifier, the 6th resistor, the 7th resistor, the 8th resistor, the 17 metal-oxide-semiconductor and capacitor, the cathode output end of described DC power supply is connected after described the 6th resistor respectively and the first end of described the 7th resistor, the normal phase input end of described the second comparator is connected with the normal phase input end of described amplifier, the inverting input of described the second comparator is connected after described the 8th resistor and is connected with described the 17 source electrode of metal-oxide-semiconductor and the inverting input of described amplifier respectively, the signal output part of described the second comparator is connected with the negative input of described amplifier, described the 17 grid of metal-oxide-semiconductor and the signal output part of described amplifier are connected, described the 17 drain electrode of metal-oxide-semiconductor and the first end of described capacitor are connected, the second end of described capacitor is connected with the cathode output end of described DC power supply and the second end of described the 7th resistor respectively.
7. a kind of current loop control circuit that is applicable to video camera according to claim 6, it is characterized in that: described sawtooth wave generating circuit comprises the 18 metal-oxide-semiconductor, the 19 metal-oxide-semiconductor, the 20 metal-oxide-semiconductor, the 21 metal-oxide-semiconductor, the source electrode of described the 20 metal-oxide-semiconductor respectively with the first end of described capacitor, the drain electrode of described the 18 metal-oxide-semiconductor is connected with the drain electrode of described the 19 metal-oxide-semiconductor, the source electrode of described the 18 metal-oxide-semiconductor is connected with described the 21 source electrode of metal-oxide-semiconductor and the source electrode of described the 19 metal-oxide-semiconductor respectively, the grid of described the 20 metal-oxide-semiconductor is connected with described the 19 grid of metal-oxide-semiconductor and the grid of described the 21 metal-oxide-semiconductor respectively, the drain electrode of described the 20 metal-oxide-semiconductor is connected with described the 21 drain electrode of metal-oxide-semiconductor and the cathode output end of described DC power supply respectively, the grid of described the 18 metal-oxide-semiconductor is the input of sawtooth waveforms, the grid of described the 19 metal-oxide-semiconductor is the output of sawtooth waveforms.
8. a kind of current loop control circuit that is applicable to video camera according to claim 7, it is characterized in that: described V-I change-over circuit comprises the 22 metal-oxide-semiconductor, the 23 metal-oxide-semiconductor, the 24 metal-oxide-semiconductor, the 25 metal-oxide-semiconductor and the 9th resistor, the grid of described the 22 metal-oxide-semiconductor is connected with the source electrode of described the 21 metal-oxide-semiconductor, the source electrode of described the 22 metal-oxide-semiconductor respectively with the source electrode of described the 23 metal-oxide-semiconductor, the grid of described the 23 metal-oxide-semiconductor is connected with the grid of described the 24 metal-oxide-semiconductor, the drain electrode of described the 23 metal-oxide-semiconductor is connected with the drain electrode of described the 24 metal-oxide-semiconductor, the source electrode of described the 24 metal-oxide-semiconductor is connected with the source electrode of reference voltage terminal and described the 25 metal-oxide-semiconductor respectively, the grid of described the 25 metal-oxide-semiconductor is connected with VB end, the drain electrode of described the 25 metal-oxide-semiconductor is connected with the second end of described the 9th resistor and the drain electrode of described the 21 metal-oxide-semiconductor respectively.
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| CN201320684466.9U CN203775300U (en) | 2013-10-30 | 2013-10-30 | Electric current loop control circuit suitable for camera |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320684466.9U CN203775300U (en) | 2013-10-30 | 2013-10-30 | Electric current loop control circuit suitable for camera |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300792A (en) * | 2014-04-22 | 2015-01-21 | 上海华力微电子有限公司 | A current detection circuit and an electric current loop control circuit comprising the current detection circuit |
| CN104506172A (en) * | 2014-11-26 | 2015-04-08 | 四川长虹欣锐科技有限公司 | 4-20mA current loop control PWM (Pulse Width Modulation) output circuit |
| CN106291062A (en) * | 2016-08-31 | 2017-01-04 | 电子科技大学 | A kind of high precision electro current detection circuit |
| CN112542948A (en) * | 2020-10-30 | 2021-03-23 | 北京时代民芯科技有限公司 | Novel slope compensation circuit |
| CN117783643A (en) * | 2024-02-27 | 2024-03-29 | 无锡力芯微电子股份有限公司 | Load current detection system |
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2013
- 2013-10-30 CN CN201320684466.9U patent/CN203775300U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300792A (en) * | 2014-04-22 | 2015-01-21 | 上海华力微电子有限公司 | A current detection circuit and an electric current loop control circuit comprising the current detection circuit |
| CN104300792B (en) * | 2014-04-22 | 2017-10-03 | 上海华力微电子有限公司 | Current detection circuit and the current loop control circuit including the current detection circuit |
| CN104506172A (en) * | 2014-11-26 | 2015-04-08 | 四川长虹欣锐科技有限公司 | 4-20mA current loop control PWM (Pulse Width Modulation) output circuit |
| CN104506172B (en) * | 2014-11-26 | 2017-03-15 | 四川长虹欣锐科技有限公司 | A kind of 4 20mA current loop control PWM output circuits |
| CN106291062A (en) * | 2016-08-31 | 2017-01-04 | 电子科技大学 | A kind of high precision electro current detection circuit |
| CN106291062B (en) * | 2016-08-31 | 2019-07-02 | 电子科技大学 | A kind of high precision electro current detection circuit |
| CN112542948A (en) * | 2020-10-30 | 2021-03-23 | 北京时代民芯科技有限公司 | Novel slope compensation circuit |
| CN112542948B (en) * | 2020-10-30 | 2022-05-13 | 北京时代民芯科技有限公司 | Slope compensation circuit |
| CN117783643A (en) * | 2024-02-27 | 2024-03-29 | 无锡力芯微电子股份有限公司 | Load current detection system |
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