CN101039077A - Current-stabilizing switch power source with voltage ripple detection circuit - Google Patents
Current-stabilizing switch power source with voltage ripple detection circuit Download PDFInfo
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- CN101039077A CN101039077A CN 200710048990 CN200710048990A CN101039077A CN 101039077 A CN101039077 A CN 101039077A CN 200710048990 CN200710048990 CN 200710048990 CN 200710048990 A CN200710048990 A CN 200710048990A CN 101039077 A CN101039077 A CN 101039077A
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Abstract
The invention provides a current regulation power supply relating to electric technique field. The power supply output current dc amount is detected by a voltage ripple detecting circuit and fed back to a control circuit to control the turn-on and turn-off of the power switch tube thus to realize regulated output. The voltage ripple detecting circuit of the current regulation switch power supply provided by this invention comprises a high pass filtering module, a second order differentiation operation module, a linear operation module, and a clock gating/signal memory module which are connected in series sequentially. The voltage ripple of the current regulation switch power supply output voltage is firstly extrated and then performed by second order differentiation, linear operation and memory extension to 'resume' the dc output voltage of the current regulation switch power supply which is finally fed back to PWM, PFM or PSM control ciucuit so as to realize regulated output via adjusting the turn-on and turn-off of the power switch tube by the control circuit. The present invention has higher power efficiency and lower circuit cost as well as smaller power supply volume compared with prior current regulation switch power supply.
Description
Technical field
The invention belongs to electronic technology field, relate to current-stabilizing switch power source, particularly the Detection ﹠ Controling technology of voltage-stabilizing switch power source output voltage.
Background technology
Switch stabilized current power supply basic functional principle is exactly under the situation that input voltage changes, inner parameter changes, external load changes, control system is by detecting controlled output current signal, and this signal feedback carried out closed loop feedback in PWM, PFM or PSM control model, regulate the conducting and the turn-off time of main circuit device for power switching, make the outputting current steadily of Switching Power Supply.
Fig. 1 is the AC/DC current-stabilizing switch power source of existing band transformer isolation.In the main circuit input stage, VAC is an AC-input voltage, representative value is 220V, Vin is process silicon bridge rectification and the filtered line input voltage of input capacitance, transformer carries out the voltage change ratio adjustment provides the isolation of input with output loop simultaneously, input stage and output stage inductance represent that with L1, L2 power switch pipe G is used to control the size from the input stage delivering power, are GND1 input stage; In the main circuit output stage, D1 is a fly-wheel diode, and C1 is an output filter capacitor, and RL is an equivalent load impedance, and Iout is an average anode current, is GND2 output stage; The current-stabilizing switch power source control circuit detects output current Iout by resistor network usually, obtain output current feedback signal If through after the DC-isolation again, If fed back in PWM, PFM or PSM control circuit carry out closed loop feedback, regulate conducting and the turn-off time of main circuit power switch pipe G then, make the outputting current steadily of current-stabilizing switch power source.The purpose that input stage and output stage adopt differently GND1 and GND2, carry out DC-isolation is to guarantee user power utilization safety, and DC-isolation realizes by optical coupler usually.
The deficiency of current-stabilizing switch power source system commonly used is: 1, output current detection circuit needs consume additional power, causes power-efficient to descend; 2, in the AC/DC transducer, input circuit and output loop are generally realized DC-isolation by optical coupler, guaranteeing user power utilization safety, and optical coupler etc. other provide the element of DC-isolation to increase system cost and volume, the power consumption of optical coupler has also reduced power-efficient simultaneously.
Because it is above not enough that electricity current-stabilizing switch power source system commonly used exists, therefore need to propose new output current detection technique and overcome, realize higher power-efficient and lower system cost.
Summary of the invention
The invention provides a kind of novel current-stabilizing switch power source, this power supply to the detection of electric power outputting current DC quantity and feed back to conducting and the turn-off time of power control circuit with the power controlling switching tube, and then is realized current stabilization output by voltage ripple detection circuit.The present invention is compared to the traditional electrical switch power supply system, has higher power-efficient, more low system cost and littler power volume.
The core concept of switching power supply of the present invention is: extract the AC portion (voltage ripple signals) in the current-stabilizing switch power source output voltage signal, then it is carried out the average anode current signal of single order differential, linear operation and storage expansion back " recovery " current-stabilizing switch power source, at last with the average anode current signal feedback of the current-stabilizing switch power source of " recovery " in PWM, PFM or PSM control circuit, by the conducting and the turn-off time of control circuit adjustment power switch pipe, finally realize current stabilization output.
Detailed technology scheme of the present invention is as follows:
Current-stabilizing switch power source with voltage ripple detection circuit as shown in Figure 2, comprises rectification, filter circuit, transformer T, power switch pipe G, control circuit, sustained diode 1, output filter capacitor C1, load RL and voltage ripple detection circuit.Input voltage V
ACBe connected to the end of transformer T secondary inductance L1 by rectification, filter circuit, the drain electrode of another termination power switch pipe G of transformer T secondary inductance L1, the drain-source of power switch pipe G connects input stage ground GND1, the output of the grid connection control circuit of power switch pipe G; The anode of the termination sustained diode 1 of transformer T secondary inductance L2, the negative electrode of sustained diode 1 connects the end after output filter capacitor C1 and the load RL parallel connection, the other end of transformer T secondary inductance L2 meets output stage ground GND2 jointly with the other end after output filter capacitor C1 and load RL are in parallel, the negative electrode of sustained diode 1 connects the input of voltage ripple detection circuit simultaneously, the input of the output connection control circuit of voltage ripple detection circuit.
In Fig. 2, when the power switch pipe conducting, Vin deposits energy in the transformer in by input stage, diode D1 ends, and converter provides electric current by output filter capacitor C1 to load RL, and this moment, the output stage equivalence was that C1 is in parallel with RL, this moment, output voltage V out descended, corresponding ripple trailing edge.Ignore output current ripple,, can get according to the current-voltage correlation of electric capacity:
Wherein, as shown in Figure 4, I
OUTFor flowing through the electric current of load RL, I
C1For flowing through the electric current of output filter capacitor C1, V
OutBe the output voltage that comprises ripple that current-stabilizing switch power source is exported, C
1Capacitance for output filter capacitor C1.By formula (1) as can be known, detection converter output DC stream of the present invention can be realized after the linear transformation by the trailing edge first derivation to output voltage ripple again.
Based on the voltage ripple detection circuit of formula (1) as shown in Figure 3, comprise high-pass filtering module, single order differentiate module, linear operation module and clock gating/signal storage module.The output voltage V out that comprises ripple and DC quantity obtains voltage ripple signals V1 after the high-pass filtering module; Voltage ripple signals V1 obtains voltage signal V2 behind the differential after single order is differentiated module; The voltage signal V3 of voltage signal V2 behind the differential after obtaining linear operation behind the linear computing module; The semaphore V of the voltage signal V3 of current signal V3 after the linear operation after the linear operation of clock gating/signal storage module gate voltage ripple signal V1 trailing edge correspondence
3, and, promptly obtain detecting output current signal (being the input signal of control circuit) If with this signal storage with in whole clock cycle output.
Detected output current signal If feeds back in PWM, PFM or PSM control circuit, and when detected output current is lower than normal value, for pwm control circuit, the power switch pipe duty ratio will increase; For the PFM control circuit, the monocyclic ON time of power switch pipe is constant, and switching frequency will increase; For the PSM control circuit, the periodicity that does not carry out switch motion that power switch pipe is skipped will reduce, and to increase output current, finally realize current stabilization output.When detected output current is higher than normal value, for pwm control circuit, the power switch pipe duty ratio will reduce; For the PFM control circuit, the monocyclic ON time of power switch pipe is constant, and switching frequency will reduce; For the PSM control circuit, the periodicity that does not carry out switch motion that power switch pipe is skipped will increase, and to reduce output current, finally realize current stabilization output.
As shown in Figure 5, in order to strengthen the driving force of detected current signal, can add the voltage follow module in above-mentioned voltage ripple detection circuit, the voltage signal V3 after the linear operation obtains storing the voltage signal V4 of output and obtain detecting output current signal (being the input signal of control circuit) If after the voltage follow module after clock gating/signal storage module.
In the above-mentioned voltage ripple detection circuit, described high-pass filtering module is a single order RC high pass filter, as shown in Figure 6, be in series by a capacitor C 2 and a resistance R 2, the output voltage V out that comprises ripple and DC quantity is by the tie point output voltage ripple signal V1 of capacitor C 2 backs from capacitor C 2 and resistance R 2.Whole stabilized current power supply output loop adopts different direct current ground respectively with voltage ripple detection circuit: output stage ground GND2 and input stage ground GND1, so that input and output loop DC-isolation, the filter network that resistance R 2 and capacitor C 2 are formed can filtering Vout DC quantity, obtain voltage ripple signals V1, the resistance R of resistance R 2
2Capacitance C with capacitor C 2
2Product R
2* C
2The cut-off frequency of decision high pass filter, this cut-off frequency should be chosen in and be lower than switching frequency below 1/10, to avoid the output voltage ripple signal of decaying; In the AC/DC converter, capacitor C 2 can replace optical coupler that the DC-isolation of input with output stage is provided, and guarantees user power utilization safety, therefore, needs capacitor C 2 can bear higher puncture voltage.
In the above-mentioned voltage ripple detection circuit, the described single order module of differentiating is a First-Order Mode quasi-differential device, as shown in Figure 7, is made up of 3, one resistance R 3 of a capacitor C and an operational amplifier OPAMP.The backward end of one termination operational amplifier OPAMP of capacitor C 3, the backward end of operational amplifier OPAMP links to each other by resistance R 3 with output, the input stage of the termination in the same way ground GND1 of operational amplifier OPAMP; Voltage ripple signals V1 imports this First-Order Mode quasi-differential device by the other end of capacitor C 3, the voltage signal V2 behind the output output differential of operational amplifier OPAMP, and satisfy:
R wherein
3Be the resistance of resistance R 3, C
3Be the capacitance of capacitor C 3, V
1Be the semaphore of voltage ripple signals V1, V
2Semaphore for the voltage signal V2 behind the differential.
In the above-mentioned voltage ripple detection circuit, described linear operation module is an in-phase amplifier that constitutes with operational amplifier, and as shown in Figure 8, by an operational amplifier OPAMP and two resistance R 6, R7 forms.The backward end of described operational amplifier OPAMP meets input stage ground GND1 by first resistance R 6, and links to each other with its output by second resistance R 7; Voltage signal V2 behind the differential is from the input of end in the same way of operational amplifier OPAMP, and the output of operational amplifier OPAMP is exported the output voltage signal V3 after the linear computing, and satisfies:
Wherein, R
6Be the resistance of first resistance R 6, R
7Be the resistance of second resistance R 7, V
2Be the semaphore of the voltage signal V2 behind the differential, V
3Semaphore for the output voltage signal V3 after the linear computing.
In the above-mentioned voltage ripple detection circuit, described linear operation module also can be the inverting amplifier that constitutes with operational amplifier, and as shown in Figure 9, by an operational amplifier OPAMP and two resistance R 4, R5 forms.The backward end of described operational amplifier OPAMP links to each other with an end of first resistance R 4, and links to each other with its output by second resistance R 5, its forward termination input stage ground GND1; Voltage signal V2 behind the differential is from the other end input of first resistance R 4, and the output of operational amplifier OPAMP is exported the output voltage signal V3 after the linear computing, and satisfies:
Wherein, R
4Be the resistance of first resistance R 4, R
5Be the resistance of second resistance R 5, V
2Be the semaphore of the voltage signal V2 behind the differential, V
3Semaphore for the output voltage signal V3 after the linear computing.
The purpose of selecting the employing operational amplifier to build the linear operation module is to improve the driving force of amplified signal, improves simultaneously and amplifies precision, can select homophase or inverting amplifier according to actual needs for use when building voltage ripple detection circuit.
In the above-mentioned voltage ripple detection circuit, described clock gating/signal storage module (as shown in figure 10) is made up of a gated clock circuit, a switch and a storage capacitance C4.One end of described switch is connected to the end of storage capacitance C4, another termination input stage ground GND1 of storage capacitance C4, and the gated clock signal that the gated clock circuit is produced acts on switch; Output voltage signal V3 after the linear computing is from the other end input of switch, and the voltage signal V4 of storage output is from the tie point output of capacitor C 4 with switch.
Because average anode current Iout can only be characterized by the first derivative of voltage ripple signals V1 trailing edge, only in ripple trailing edge time corresponding section effective (promptly in the ON time section corresponding to power switch pipe G), and switch power supply system requires the output current control signal all effective in the whole clock cycle, therefore need carry out clock gating and signal storage, i.e. the semaphore V of voltage signal V3 after the linear operation of gating V1 trailing edge correspondence
3, and with semaphore V
3Storage, output signal amount V in the whole clock cycle then
3,, finally obtain detecting output current signal If (input signal of control circuit) up to the arrival of next gated clock.Clock gating/signal storage module relies on capacitor C 4 to carry out signal storage, and when switch closure, capacitor C 4 both end voltage are charged to the V in the gating time
3Value, after switch disconnected, capacitor C 4 was kept this voltage, thereby this voltage signal can be expanded to whole switch periods by gating time, simulated control so that the back level to be provided.The value of capacitor C 4 must rationally be chosen, if too big, then is difficult to be charged to corresponding signal level V by the voltage signal V3 after the linear operation
3If too little, then when disconnecting, switch is difficult in whole switch periods, keep signal.
Described gated clock circuit can be a pierce circuit, and the gated clock signal that pierce circuit produced has the identical clock cycle with power switch pipe G, and its gating time section is in during the voltage ripple signals V1 trailing edge; Described switch can be realized that less switching tube conducting resistance will reduce the requirement to the voltage signal V3 driving force after the linear operation by switching transistor.It is the method detection output voltage of the fixedly gated clock of power switch pipe G operating frequency that the present invention adopts clock frequency, being about to output voltage and gating time section fixes, by being set, minimum duty cycle Dmin guaranteed output switching tube G must be in conducting state in the time period at the initial Dmin of each switch periods, corresponding to the output voltage ripple trailing edge, by the output current gated clock is fixed in this Dmin in the time period, guarantee to detect output current signal If.
Described voltage follow module (as shown in figure 11) is made up of an operational amplifier OPAMP, and the backward end of described operational amplifier links to each other with output; Storage output voltage V 4 is from the input of end in the same way of operational amplifier OPAMP, and the output output of operational amplifier OPAMP detects output current signal If; Its role is to strengthen the driving force of control circuit input signal If.
Each signal waveform schematic diagram of voltage ripple detection circuit in the current-stabilizing switch power source of the present invention, as shown in Figure 4.Fig. 4 (a) is the control signal Vc of power switch pipe, is 50% to be that example describes with duty ratio, Dmin and Dmax minimum and the maximum duty cycle for being provided with.Fig. 4 (b) is the output voltage waveforms Vout of whole stabilized voltage power supply, and Fig. 4 (c) is through the ripple voltage signal V1 after the high-pass filtering.Comparison diagram 4 (a) and Fig. 4 (b), Fig. 4 c), when power switch pipe is in closure state, corresponding to the voltage ripple trailing edge, when power switch pipe is in off-state, corresponding to the voltage ripple rising edge.Fig. 4 (d) is for carrying out the voltage signal V2 after single order is differentiated to ripple voltage signal V1, Fig. 4 (e) carries output current information for the voltage signal V2 after differentiating being carried out the voltage signal V3 after the linear operation among the voltage signal V3 after the linear operation corresponding with the ripple voltage signal V1 trailing edge time period.Fig. 4 (f) is an output current gated clock waveform, obtain output current signal If by the voltage signal V3 after the linear operation of gating ripple voltage signal V1 trailing edge correspondence, the present invention adopts the fixedly detection method of gated clock, therefore, need to be provided with the minimum duty cycle Dmin shown in Fig. 6 (a), the guaranteed output switching tube has certain opening time, to guarantee that voltage ripple has one period set time and is in trailing edge, guarantee that finally fixedly gated clock can detect output current signal If.Fig. 4 (g) is detected output current If, and output current signal If feeds back in PWM, PFM or PSM control circuit, adjusts the conducting and the turn-off time of power switch pipe, to stablize output current.
Current-stabilizing switch power source with ripple detection circuit of the present invention is compared with existing current-stabilizing switch power source, has the following advantages:
1, utilizes voltage ripple detection circuit to replace traditional output current detection circuit, eliminated the dc power of traditional output current detection circuit, thereby improved the efficient of current-stabilizing switch power source.
2, replace optical coupler with electric capacity and import DC-isolation with output loop, reduce the power-supply system volume, reduce system cost.
In the AC/DC transducer, need input circuit and output loop to realize DC-isolation, to guarantee user power utilization safety.The present invention carries out DC-isolation by the capacitor C in the high pass filter 2, replaces optical coupler, can reduce the power-supply system volume, reduces the power supply cost.
Description of drawings
Fig. 1: the AC/DC current-stabilizing switch power source schematic diagram of band transformer isolation.
Fig. 2: the current-stabilizing switch power source circuit diagram with voltage ripple detection circuit of the present invention.
Fig. 3: voltage ripple detection circuit block diagram in the current-stabilizing switch power source of the present invention.
Fig. 4: each signal waveform schematic diagram of voltage ripple detection circuit part in the current-stabilizing switch power source of the present invention.
Fig. 5: the voltage ripple detection circuit schematic diagram that has added voltage follower circuit in the current-stabilizing switch power source of the present invention.
Fig. 6: the high-pass filtering module circuit diagram of voltage ripple detection circuit in the current-stabilizing switch power source of the present invention.
Fig. 7: the single order of the voltage ripple detection circuit module circuit diagram of differentiating in the current-stabilizing switch power source of the present invention.
Fig. 8: the linear operation module circuit diagram with the inverting amplifier formation of voltage ripple detection circuit in the current-stabilizing switch power source of the present invention.
Fig. 9: the linear operation module circuit diagram with the in-phase amplifier formation of voltage ripple detection circuit in the current-stabilizing switch power source of the present invention.
Figure 10: the clock of voltage ripple detection circuit gating/signal storage module circuit diagram in the current-stabilizing switch power source of the present invention.
Figure 11: the voltage follower circuit figure of voltage ripple detection circuit in the current-stabilizing switch power source of the present invention.
Figure 12: utilize voltage ripple detection circuit schematic diagram in the current-stabilizing switch power source of the present invention that the part digital circuit realizes.
Embodiment
Execution mode one
Current-stabilizing switch power source with voltage ripple detection circuit as shown in Figure 2, comprises rectification, filter circuit, transformer T, power switch pipe G, control circuit, sustained diode 1, output filter capacitor C1, load RL and voltage ripple detection circuit.Input voltage V
ACBe connected to the end of transformer T secondary inductance L1 by rectification, filter circuit, the drain electrode of another termination power switch pipe G of transformer T secondary inductance L1, the drain-source of power switch pipe G connects input stage ground GND1, the output of the grid connection control circuit of power switch pipe G; The anode of the termination sustained diode 1 of transformer T secondary inductance L2, the negative electrode of sustained diode 1 connects the end after output filter capacitor C1 and the load RL parallel connection, the other end of transformer T secondary inductance L2 meets output stage ground GND2 jointly with the other end after output filter capacitor C1 and load RL are in parallel, the negative electrode of sustained diode 1 connects the input of voltage ripple detection circuit simultaneously, the input of the output connection control circuit of voltage ripple detection circuit.
Described voltage ripple detection circuit comprises high-pass filtering module, single order differentiate module, linear operation module, clock gating/signal storage module and voltage follow module as shown in Figure 5.The output voltage V out that comprises ripple and DC quantity obtains voltage ripple signals V1 after the high-pass filtering module; Voltage ripple signals V1 obtains voltage signal V2 behind the differential after single order is differentiated module; The voltage signal V3 of voltage signal V2 behind the differential after obtaining linear operation behind the linear computing module; The semaphore V of the voltage signal V3 of voltage signal V3 after the linear operation after the linear operation of clock gating/signal storage module gate voltage ripple signal V1 trailing edge correspondence
3, and with semaphore V
3Store and, obtain storing the voltage signal V4 of output and after the voltage follow module, obtain detecting output current signal (being the input signal of control circuit) If in whole clock cycle output.
In the above-mentioned voltage ripple detection circuit, described high-pass filtering module is a single order RC high pass filter, as shown in Figure 6, be in series by a capacitor C 2 and a resistance R 2, the output voltage V out that comprises ripple and DC quantity is by the tie point output voltage ripple signal V1 of capacitor C 2 backs from capacitor C 2 and resistance R 2.The converter output loop adopts different direct current ground respectively with detection system: output stage ground GND2 and input stage ground GND1, so that input and output loop DC-isolation, the filter network that resistance R 2 and capacitor C 2 are formed can filtering Vout DC quantity, obtain voltage ripple signals V1, the resistance R of resistance R 2
2Capacitance C with capacitor C 2
2Product R
2* C
2The cut-off frequency of decision high pass filter, this cut-off frequency should be chosen in and be lower than switching frequency below 1/10, to avoid the output voltage ripple signal of decaying; In the AC/DC converter, capacitor C 2 can replace optical coupler that the DC-isolation of input with output stage is provided, and guarantees user power utilization safety, therefore, needs capacitor C 2 can bear higher puncture voltage.
The described single order module of differentiating is a First-Order Mode quasi-differential device, as shown in Figure 7, is made up of 3, one resistance R 3 of a capacitor C and an operational amplifier OPAMP.The backward end of one termination operational amplifier OPAMP of capacitor C 3, the backward end of operational amplifier OPAMP links to each other by resistance R 3 with output, the input stage of the termination in the same way ground GND1 of operational amplifier OPAMP; Voltage ripple signals V1 imports this First-Order Mode quasi-differential device by the other end of capacitor C 3, the voltage signal V2 behind the output output differential of operational amplifier OPAMP, and satisfy:
R wherein
3Be the resistance of resistance R 3, C
3Be the capacitance of capacitor C 3, V
1Be the semaphore of voltage ripple signals V1, V
2Semaphore for the voltage signal V2 behind the differential.
Described linear operation module is an in-phase amplifier that constitutes with operational amplifier, and as shown in Figure 8, by an operational amplifier OPAMP and two resistance R 6, R7 forms.The backward end of described operational amplifier OPAMP meets input stage ground GND1 by first resistance R 6, and links to each other with its output by second resistance R 7; Voltage signal V2 behind the differential is from the input of end in the same way of operational amplifier OPAMP, and the output of operational amplifier OPAMP is exported the output voltage signal V3 after the linear computing, and satisfies:
Wherein, R
6Be the resistance of first resistance R 6, R
7Be the resistance of second resistance R 7, V
2Be the semaphore of the voltage signal V2 behind the differential, V
3Semaphore for the output voltage signal V3 after the linear computing.
Described linear operation module also can be the inverting amplifier that constitutes with operational amplifier, and as shown in Figure 9, by an operational amplifier OPAMP and two resistance R 4, R5 forms.The backward end of described operational amplifier OPAMP links to each other with an end of first resistance R 4, and links to each other with its output by second resistance R 5, its forward termination input stage ground GND1; Voltage signal V2 behind the differential is from the other end input of first resistance R 4, and the output of operational amplifier OPAMP is exported the output voltage signal V3 after the linear computing, and satisfies:
Wherein, R
4Be the resistance of first resistance R 4, R
5Be the resistance of second resistance R 5, V
2Be the semaphore of the voltage signal V2 behind the differential, V
3Semaphore for the output voltage signal V3 after the linear computing.
Described clock gating/signal storage module (as shown in figure 10) is made up of a gated clock circuit, a switch and a storage capacitance C4.One end of described switch is connected to the end of storage capacitance C4, another termination input stage ground GND1 of storage capacitance C4, and the gated clock signal that the gated clock circuit is produced acts on switch; Output voltage signal V3 after the linear computing is from the other end input of switch, and the voltage signal V4 of storage output is from the tie point output of capacitor C 4 with switch.
Described gated clock circuit can be a pierce circuit, and the gated clock signal that pierce circuit produced has the identical clock cycle with power switch pipe G, and its gating time section is in during the voltage ripple signals V1 trailing edge; Described switching tube can be realized that less switching tube conducting resistance will reduce the requirement to the voltage signal V3 driving force after the linear operation by switching transistor.
Described voltage follow module (as shown in figure 11) is made up of an operational amplifier OPAMP, and the backward end of described operational amplifier links to each other with output; Storage output voltage V 4 is from the input of end in the same way of operational amplifier OPAMP, and the output output of operational amplifier OPAMP detects output current signal If; Its role is to strengthen the driving force of control circuit input signal If.
Execution mode two
Voltage-stabilizing switch power source with voltage ripple detection circuit as shown in Figure 2, comprises rectification, filter circuit, transformer T, power switch pipe G, control circuit, sustained diode 1, output filter capacitor C1, load RL and voltage ripple detection circuit.Input voltage V
ACBe connected to the end of transformer T secondary inductance L1 by rectification, filter circuit, the drain electrode of another termination power switch pipe G of transformer T secondary inductance L1, the drain-source of power switch pipe G connects input stage ground GND1, the output of the grid connection control circuit of power switch pipe G; The anode of the termination sustained diode 1 of transformer T secondary inductance L2, the negative electrode of sustained diode 1 connects the end after output filter capacitor C1 and the load RL parallel connection, the other end of transformer T secondary inductance L2 meets output stage ground GND2 jointly with the other end after output filter capacitor C1 and load RL are in parallel, the negative electrode of sustained diode 1 connects the input of voltage ripple detection circuit simultaneously, the input of the output connection control circuit of voltage ripple detection circuit.
Described voltage ripple detection circuit as shown in figure 12, comprises high-pass filtering module, linear amplification module, A/D modular converter, single order numerical differentiation computing module, numerical linear computing module and clock gating/digital latch module.The output voltage V out that comprises ripple and DC quantity obtains voltage ripple signals V1 after the high-pass filtering module; Voltage ripple signals V1 obtains the voltage ripple signals V11 of linear amplification behind linear amplification module; The voltage signal V11 of linear amplification converts digital voltage ripple signal V13 to through the A/D modular converter; Digital voltage ripple signal V13 voltage signal V2 after single order numerical differentiation computing module obtains differential; The voltage signal V3 of voltage signal V2 behind the differential after obtaining linear operation behind the numerical linear computing module; The semaphore V of the voltage signal V3 of voltage signal V3 after the linear operation after the linear operation of clock gating/digital latch module gate voltage ripple signal V1 trailing edge correspondence
3, and with semaphore V
3Store and export, promptly obtain detecting output current signal (being the input signal of control circuit) If in the whole clock cycle.
Claims (10)
1, the current-stabilizing switch power source that has voltage ripple detection circuit comprises rectification, filter circuit, transformer (T), power switch pipe (G), control circuit, fly-wheel diode (D1), output filter capacitor (C1), load (RL) and voltage ripple detection circuit; Input voltage (V
AC) be connected to an end of transformer (T) secondary inductance (L1) by rectification, filter circuit, the drain electrode of another termination power switch pipe (G) of transformer (T) secondary inductance (L1), the drain-source of power switch pipe (G) connects input stage ground (GND1), the output of the grid connection control circuit of power switch pipe (G); The anode of one termination fly-wheel diode (D1) of transformer (T) secondary inductance (L2), the negative electrode of fly-wheel diode (D1) connects the end after output filter capacitor (C1) and load (RL) parallel connection, the other end of transformer (T) secondary inductance (L2) connects output stage ground (GND2) jointly with the other end after output filter capacitor (C1) and load (RL) are in parallel, the negative electrode of fly-wheel diode (D1) connects the input of voltage ripple detection circuit simultaneously, the input of the output connection control circuit of voltage ripple detection circuit;
Described voltage ripple detection circuit comprises high-pass filtering module, single order differentiate module, linear operation module and clock gating/signal storage module; The output voltage (Vout) that comprises ripple and DC quantity obtains voltage ripple signals (V1) after the high-pass filtering module; Voltage ripple signals (V1) obtains voltage signal (V2) behind the differential after single order is differentiated module; The voltage signal (V3) of voltage signal behind the differential (V2) after obtaining linear operation behind the linear computing module; The semaphore V of the voltage signal (V3) of the voltage signal after the linear operation (V3) after the linear operation of clock gating/signal storage module gate voltage ripple signal (V1) rising edge correspondence
3, and with semaphore V
3Store and export, promptly obtain detecting output current signal (If) in the whole clock cycle.
2, the current-stabilizing switch power source with voltage ripple detection circuit according to claim 1, it is characterized in that, described voltage ripple detection circuit also comprises a voltage follow module, and the voltage signal after the linear operation (V3) obtains storing the voltage signal (V4) of output and obtain detecting output current signal (If) after the voltage follow module after clock gating/signal storage module.
3, the current-stabilizing switch power source with voltage ripple detection circuit according to claim 1 and 2, it is characterized in that, described high-pass filtering module is a single order RC high pass filter, be in series by electric capacity (C2) and a resistance (R2), the output voltage (Vout) that comprises ripple and DC quantity is by the tie point output voltage ripple signal (V1) of electric capacity (C2) back from electric capacity (C2) and resistance (R2).
4, the current-stabilizing switch power source with voltage ripple detection circuit according to claim 1 and 2, it is characterized in that, the described single order module of differentiating is a First-Order Mode quasi-differential device, and by an electric capacity (C3), a resistance (R3) and an operational amplifier (OPAMP) are formed; The backward end of one termination operational amplifier (OPAMP) of electric capacity (C3), the backward end of operational amplifier (OPAMP) links to each other by resistance (R3) with output, the input stage of the termination in the same way ground (GND1) of operational amplifier (OPAMP); Voltage ripple signals (V1) is imported this First-Order Mode quasi-differential device by the other end of electric capacity (C3), the voltage signal (V2) behind the output output differential of operational amplifier (OPAMP), and satisfy:
R wherein
3Be the resistance of resistance (R3), C
3Be the capacitance of electric capacity (C3), V
1Be the semaphore of voltage ripple signals (V1), V
2Semaphore for the voltage signal behind the differential (V2).
5, the voltage-stabilizing switch power source with voltage ripple detection circuit according to claim 1 and 2, it is characterized in that, described linear operation module is an in-phase amplifier that constitutes with operational amplifier, by an operational amplifier (OPAMP) and two resistance (R6, R7) compositions; The backward end of described operational amplifier (OPAMP) connects input stage ground (GND1) by first resistance (R6), and links to each other with its output by second resistance (R7); Voltage signal behind the differential (V2) is from the input of end in the same way of operational amplifier (OPAMP), and the output of operational amplifier (OPAMP) is exported the output voltage (V3) after the linear computing, and satisfies:
Wherein, R
6Be the resistance of first resistance (R6), R
7Be the resistance of second resistance (R7), V
2Be the semaphore of the voltage signal behind the differential (V2), V
3Semaphore for the output voltage after the linear computing (V3).
6, the voltage-stabilizing switch power source with voltage ripple detection circuit according to claim 1 and 2, it is characterized in that, described linear operation module also can be the inverting amplifier that constitutes with operational amplifier, by an operational amplifier (OPAMP) and two resistance (R4, R5) compositions; The backward end of described operational amplifier (OPAMP) links to each other with an end of first resistance (R4), and links to each other with its output by second resistance (R5), its forward termination input stage ground (GND1); Voltage signal behind the differential (V2) is from the other end input of first resistance (R4), and the output of operational amplifier (OPAMP) is exported the output voltage (V3) after the linear computing, and satisfies:
Wherein, R
4Be the resistance of first resistance (R4), R
5Be the resistance of second resistance (R5), V
2For being the semaphore of the voltage signal (V2) behind the differential, V
3Semaphore for the output voltage after the linear computing (V3).
7, the voltage-stabilizing switch power source with voltage ripple detection circuit according to claim 1 and 2 is characterized in that, described clock gating/signal storage module is made up of a gated clock circuit, switch and a storage capacitance (C4); One end of described switch is connected to an end of storage capacitance (C4), another termination input stage ground (GND1) of storage capacitance (C4), and the gated clock signal that the gated clock circuit is produced acts on switch; Output voltage after the linear computing (V3) is from the other end input of switch, and the voltage signal (V4) of storage output is from the tie point output of storage capacitance (C4) with switch.
8, the voltage-stabilizing switch power source with voltage ripple detection circuit according to claim 7, it is characterized in that, described gated clock circuit can be a pierce circuit, the gated clock signal that pierce circuit produced has the identical clock cycle with power switch pipe (G), and its gating time section is in during voltage ripple signals (V1) trailing edge; Described switch can be realized by switching transistor.
9, the voltage-stabilizing switch power source with voltage ripple detection circuit according to claim 2 is characterized in that, described voltage follow module is made up of an operational amplifier (OPAMP), and the backward end of described operational amplifier links to each other with output; Storage output voltage (V4) is from the input of end in the same way of operational amplifier (OPAMP), and the output output of operational amplifier (OPAMP) detects output current signal (If).
10, the voltage-stabilizing switch power source with voltage ripple detection circuit according to claim 1, it is characterized in that, described voltage ripple detection circuit comprises high-pass filtering module, linear amplification module, A/D modular converter, single order numerical differentiation computing module, numerical linear computing module and clock gating/digital latch module; The output voltage (Vout) that comprises ripple and DC quantity obtains voltage ripple signals (V1) after the high-pass filtering module; Voltage ripple signals (V1) obtains the voltage ripple signals (V11) of linear amplification behind linear amplification module; The voltage signal of linear amplification (V11) converts digital voltage ripple signal (V13) to through the A/D modular converter; Digital voltage ripple signal (V13) is voltage signal (V2) after single order numerical differentiation computing module obtains differential; The voltage signal (V3) of voltage signal behind the differential (V2) after obtaining linear operation behind the numerical linear computing module; The semaphore V of the voltage signal (V3) of the voltage signal after the linear operation (V3) after the linear operation of clock gating/digital latch module gate voltage ripple signal (V1) trailing edge correspondence
3, and with semaphore V
3Store and export, promptly obtain detecting output current signal (If) in the whole clock cycle.
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| CNB2007100489906A CN100459392C (en) | 2007-04-28 | 2007-04-28 | Current-stabilizing switch power source with voltage ripple detection circuit |
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| CNB2007100489906A CN100459392C (en) | 2007-04-28 | 2007-04-28 | Current-stabilizing switch power source with voltage ripple detection circuit |
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| CN101039077A true CN101039077A (en) | 2007-09-19 |
| CN100459392C CN100459392C (en) | 2009-02-04 |
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