CN101226411B - Power consumption measuring and control method for sound system switch power source as well as special device thereof - Google Patents
Power consumption measuring and control method for sound system switch power source as well as special device thereof Download PDFInfo
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Abstract
The invention relates to a power consumption detecting controlling method of sound equipment switch power supply and a relative device, which is characterized in that a power detection controller is arranged in the switch power supply of sound equipment, the power detection controller can detect the real-time output power of the switch power supply, wherein (1) when the output power of the switchpower supply is not same as the nominal power of load, the controller controls the output voltage of the switch power supply stable and automatically adapts the output power for load change, (2), when the output power is higher than load nominal power or is increased, the controller generates an overpower signal to reduce the output voltage of the switch power supply, automatically adjust the output voltage and adapt the output power for the load change, thereby reducing internal power consumption. The invention can reduce internal power consumption of sound equipment at high-power operation,with low consumption, high dynamic response and low cost.
Description
Technical field
The present invention relates to a kind of power consumption measuring and control method and isolated plant thereof of sound system Switching Power Supply.Belong to sound system switch power technology field.
Background technology
Open at present, it has good characteristics such as volume is little, in light weight, efficient is high, ripple is little, noise is low, easy dilatation Switching Power Supply Yin Qiyin, and is widely used on the various electronic equipments.Because the Switching Power Supply of prior art can only be exported constant switching voltage, therefore, it can only be by using as source of stable pressure.For requiring power supply along with the variation of load in the sound equipment power amplification system, automatically adjust the occasion of output voltage, this class Switching Power Supply and present existing regular tap power supply can not be able to not be used in sound equipment power amplification system even load adjusts the place of output voltage when changing automatically, and can only export stable voltage, therefore, existing regular tap power supply is not suitable for the application of sound equipment power amplification system.If the output voltage of Switching Power Supply can not the dynamic change along with load variations, just can not satisfy the dynamic response requirement of sound equipment power amplification system, might cause output power excessive, thereby cause sound equipment power amplification system internal loss to increase, the easy like this power device that causes is overheated even burn.Therefore, how the output voltage of switch power for sound box power amplification system is done dynamic variation (output power is followed variation) with load variations, thereby reduces the power attenuation of power amplification system, is the technical matters that those skilled in the art are badly in need of solving.
Summary of the invention
First purpose of the present invention is can not follow load variations and change for the output voltage that solves Switching Power Supply in the prior art, and the problem that causes the power amplification system internal loss to increase easily provides a kind of power consumption measuring and control method of sound system Switching Power Supply.
Second purpose of the present invention is for a kind of isolated plant of the power consumption measuring and control method for the sound system Switching Power Supply is provided.
First purpose of purpose of the present invention can reach by following measure:
The power consumption measuring and control method of sound system Switching Power Supply is characterized in that: the power detection controller is set in the Switching Power Supply of sound equipment power amplification system, and this power detection controller passes through the real-time output power of detector switch power supply,
1) when the Switching Power Supply output power that detects the sound equipment power amplification system is equal to or less than the rated power of load, gauge tap power supply output burning voltage, and make output power be adapted to the variation of load automatically;
2) when the Switching Power Supply output power that detects the sound equipment power amplification system during greater than the rated power of load, produce an overpower signal, the output voltage of Switching Power Supply is reduced, output voltage is adjusted automatically, make output power be adapted to the variation of load automatically, reduce the internal system power attenuation;
3) when the proportional increase of main-transformer primary current, the power detection controller is taken a sample to the electric current on the former limit of Switching Power Supply main-transformer, and this sampling current and benchmark setting voltage are compared, and produces an overpower signal according to comparative result; The power detection controller changes error ratio benchmark setting voltage by the overpower signal, and then reduces the output duty cycle of the pulse-width modulation PWM of control circuit, finally reduces output voltage, and realization voltage is adjusted automatically;
4) produce an overpower signal as condition as described in the step 3), the power detection controller is taken a sample to the electric current on the former limit of Switching Power Supply main-transformer, overpower signal back benchmark setting voltage, form and stagnate chain rate, when output power raise, the voltage signal that is converted by current sampling signal reacted, reduces the output voltage of Switching Power Supply rapidly.
Second purpose of purpose of the present invention can reach by following measure:
Be used for the isolated plant of the power consumption measuring and control method of sound system Switching Power Supply, it is characterized in that: formed by power-sensing circuit and control circuit; The signal input part of power-sensing circuit is connected with the former limit of the main-transformer of Switching Power Supply winding, output terminal is connected with the input end of control circuit, and the signal output part of control circuit connects the signal input part of the translation circuit of Switching Power Supply; Power-sensing circuit is formed by connecting by current sampling unit, signal conversion unit, rectification filtering unit, reference voltage unit, voltage comparison unit, delay unit and stagnant ring element; Take a sample to the electric current on the former limit of Switching Power Supply main-transformer in the current sampling unit, the output terminal of current sampling unit connects a comparison input end of voltage comparison unit by signal conversion unit, rectification filtering unit, the output terminal of voltage comparison unit connects the input end of delay unit, the output terminal of delay unit is by the input end of the ring element connection reference voltage unit that stagnates, and the output terminal of reference voltage unit connects a comparison input end of voltage comparison unit; Control circuit is formed by connecting by sampling voltage unit, benchmark setup unit, error amplifying unit and PWM control module; The input end of benchmark setup unit connects the output terminal of delay unit, the output terminal of the output terminal of benchmark setup unit, sampling voltage unit respectively connects an input end of error amplifying unit, the output terminal of error amplifying unit connects the input end of PWM control module, the output terminal of PWM control module is as the signal input part of the translation circuit of the signal output part connection Switching Power Supply of control circuit, output pulse control signal.
Second purpose of purpose of the present invention can also reach by following measure:
Further, power-sensing circuit is formed by connecting by current transformer, resistance R 34～R43, precision resistance RJ12, capacitor C 22, electrochemical capacitor EC18～EC19, diode D19, triode Q6～Q8 and voltage comparator chip IC 2A～IC2B; Behind current transformer and the connecting resistance R42 and by diode D19, resistance R 41, polarity free capacitor C22 is connected with the RC filtering circuit that electrochemical capacitor EC18 constitutes, the inverting input of the output termination voltage comparator ic 2A of RC filtering circuit, the normal phase input end of voltage comparator ic 2A connects the benchmark setting voltage, the output terminal of voltage comparator ic 2A is by being connected the in-phase input end of voltage comparator ic 2B with the delay circuit that electrochemical capacitor EC19 forms by resistance R 39, the reverse input end of voltage comparator ic 2B links to each other with the benchmark setting voltage, and the output terminal of voltage comparator ic 2B passes through by current-limiting resistance R36, triode Q8, resistance R 35, resistance R 34 is connected the base stage of the triode Q6 of control circuit with the driving amplifying circuit that accessory power supply is formed; The output terminal of voltage comparator ic 2B also connects the base stage of triode Q7 by resistance R 38, triode Q7 emitter connects the normal phase input end of voltage comparator ic 2A by precision resistance RJ12, resistance R 43 be connected across triode Q7 collector, increase between the utmost point, form the chain rate that stagnates than circuit; Control circuit comprises a PWM control module and an error amplifying unit, the inverting input of error amplifying unit is connected with the signal output part of power-sensing circuit by potential-divider network and the triode Q6 that is made up of respectively resistance R J3, RJ4, RJ7, RJ9, RJ10, wherein, the potential-divider network of forming through resistance R J3, RJ4, RJ7, RJ9, RJ10 is that the 2nd, 15 pin of TL494 are set up the benchmark setting voltage, and the potential-divider network of forming through resistance R J7, RJ9, RJ10 is that the 2nd pin of TL494 is set up the benchmark setting voltage; Its in-phase input end connects the sampled voltage of Switching Power Supply output.
The invention has the beneficial effects as follows:
1, the present invention arranges the power detection controller from functional requirement the Switching Power Supply of common sound system, in control circuit, be provided with dynamic electric voltage control function, make Switching Power Supply adjust output voltage automatically along with the variation of load, make the sound equipment power amplification system when high power work, reduce internal loss.Monitor output power by detector switch power supply main-transformer primary current, testing circuit is taken a sample to this electric current, and current signal is converted into voltage signal, compare the back with the benchmark setting voltage and produce an overpower signal, control circuit changes error ratio benchmark setting voltage after detecting the overpower signal, and then the output duty cycle of width modulation (PWM) controller of reduction control circuit, finally reduce output voltage, internal system loss.
2, the present invention uses in the Switching Power Supply of sound equipment power amplification system by the applicant, and obtain good effect, the Switching Power Supply that under this technical support, designs, characteristics with low-loss, high dynamic response, low cost, high reliability, for the sound equipment power amplification system provides the strong impetus support, thus make the sound equipment power amplification system more economically, environmental protection and efficient.
Description of drawings
Fig. 1 is the schematic block circuit diagram of Switching Power Supply.
Fig. 2 is power detection controller principle block diagram.
Fig. 3 is the circuit diagram of power-sensing circuit of the present invention.
The circuit diagram of Fig. 4 Detection ﹠ Controling circuit of the present invention.
Embodiment
Present invention is described below in conjunction with the principle of accompanying drawing and Switching Power Supply.
Specific embodiment
With reference to Fig. 1, Switching Power Supply related to the present invention comprises input circuit, translation circuit, output circuit, testing circuit, holding circuit and accessory power supply.In addition, in Switching Power Supply, insert power-sensing circuit of the present invention and control circuit.Described input circuit, translation circuit and output circuit are connected successively; The signal input part of described testing circuit is connected with the signal output part of output circuit; Described holding circuit signal input part connects the signal output part of input circuit and the signal output part of output circuit respectively; The signal input part of power-sensing circuit is connected with the signal output part of input circuit; The signal input part of described control circuit is the signal output part of connection detection circuit, holding circuit and power-sensing circuit respectively, and its signal output part connects the signal discrepancy end of translation circuit; The signal output part of described accessory power supply connects the signal input part of control circuit and power-sensing circuit respectively.
Exchange input through the input circuit rectifying and wave-filtering, pass through the DC voltage of translation circuit and output circuit inversion secondary rectifying and wave-filtering output smoothing then.Sampling feeds back to control circuit formation closed-loop control to testing circuit to output voltage.Holding circuit detects the over-voltage and over-current signal, comes the output of width modulation (PWM) controller of locking control circuit, the safety of protection power-supply system.Power-sensing circuit detects the overpower signal, and the dynamic adjustments output voltage reduces internal loss.Accessory power supply is control circuit and power-sensing circuit power supply.
With reference to Fig. 2, the present invention utilizes power-sensing circuit detector switch power supply main-transformer primary current to monitor output power; When Switching Power Supply output miniwatt, it is stable that output voltage keeps, and output power is adaptive to the variation of load.When output power increases, the proportional increase of main-transformer primary current, power-sensing circuit is by taking a sample to this electric current, and current signal is converted into voltage signal, by comparing with the benchmark setting voltage, anti-shake through the RC time-delay, produce an overpower signal; When control circuit detects the overpower signal, change the potential-divider network of control circuit by the conducting of bipolar transistor, change error ratio benchmark setting voltage, and then reduce the output duty cycle of width modulation (PWM) controller of control circuit, finally reduce output voltage.
Dynamically the specific implementation process of control is as follows to be applied to the power detection of Switching Power Supply of sound equipment power amplification system and output voltage:
The present invention arranges the power detection controller in the Switching Power Supply of sound equipment power amplification system, this power detection controller passes through the real-time output power of detector switch power supply,
1) when the Switching Power Supply output power that detects the sound equipment power amplification system is equal to or less than the rated power of load, gauge tap power supply output burning voltage, and make output power be adapted to the variation of load automatically;
2) when the Switching Power Supply output power that detects the sound equipment power amplification system during greater than the rated power of load, produce an overpower signal, the output voltage of Switching Power Supply is reduced, output voltage is adjusted automatically, make output power be adapted to the variation of load automatically, reduce the internal system power attenuation.
Power-sensing circuit is monitored output power (output power and primary current are proportional) by detector switch power supply main-transformer primary current.Main-transformer primary current signal is sampled by current transformer, and current sampling signal is by series resistor, and through the current rectifying and wave filtering circuit that diode and capacitance resistance are formed, is converted into voltage signal.Voltage signal is directly proportional with output power.This voltage signal compares by voltage comparator and benchmark setting voltage, and through RC circuit delay (preventing the overpower control misoperation that circuit jitter causes), produces the overpower signal.Overpower signal one tunnel is set end through the stagnant chain rate of triode and divider resistance composition than the reference voltage that circuit feeds back to voltage comparator, make that having served as the power signal Drive and Control Circuit reduces output voltage, when output power also decreases, current sampling circuit can reflect rapidly, boosted output voltages.Another road of overpower signal is through amplifying, change the potential-divider network of benchmark setting voltage in the control circuit by turn-on transistor, this benchmark setting voltage links to each other with PDM keyer internal error amplifier's inverting input, and the sampled voltage of Switching Power Supply output then links to each other with in-phase input end.When control circuit detects the overpower signal, the triode conducting, potential-divider network changes, the benchmark setting voltage reduces, and the benchmark setting voltage after output sampling voltage and the reduction carries out error ratio and amplifies, and the output duty cycle of PDM keyer is reduced, and then the output voltage of reduction Switching Power Supply, reach power intelligent identification, voltage is adjusted automatically, the purpose of control system internal loss.
CN in the circuit diagram is socket, and R is resistance, and RJ is precision resistance, L is inductance, C is polarity free capacitor, and EC is electrochemical capacitor, the D diode, Q is triode, ZD is stabilivolt, and F is fuse, and NTC is thermistor SCK2R55A, ZNR is voltage dependent resistor (VDR) 14D561, T1, T2, T3 is transformer, and T4 and T5 are current transformer, and DB is rectifier bridge KBU610, IC1 is voltage-type width modulation (PWM) controller TL494, IC2 is voltage comparator LM393, and IC3 is current source PWM (PWM) controller Viper22, and IC4 is the adjustable shunting reference source of three ends TL431, IC5 is three-terminal voltage-stabilizing chip 7805, and U1 is photoelectrical coupler PC817.
With reference to Fig. 3, power-sensing circuit is by resistance R 33, R34, R35, R36, R37, R38, R39, R40, R41, R42, R43, precision resistance RJ11, RJ12, RJ13, capacitor C 22, diode D21, D22, D19, D20, electrochemical capacitor EC18, EC19, transformer T5, inductance L 22, triode Q7, Q8, voltage comparator ic 2A, IC2B form.Power-sensing circuit is monitored output power by detector switch power supply main-transformer primary current.Four tunnel output powers are converted+35V one tunnel output, T1 former limit winding and secondary 14,16 pin winding turns are than being 1:0.512, during output power 250W, + 35V output voltage corresponding current 250/35=7.14A, the former limit of T1 winding current is 3.66A, the current transformer T5 turn ratio is 1:80, and then the T5 sampling current is 0.046A.Seal in R42(47 ohm), produce 2.14V voltage.Be equivalent to detection R42 both end voltage greater than 2.15V detecting output power above 250W thus.
In the power-sensing circuit, current transformer is sampled to the main-transformer primary current, resistance R 42 by serial connection, pass through the RC filtering circuit that diode D17 and R41, C22 and EC18 constitute again, current signal is converted into voltage signal, this voltage signal connects 2 pin (inverting input) of voltage comparator ic 2A, 3 pin connect benchmark setting voltage (in-phase input end), the delay circuit that 1 pin output terminal is formed through R39 and EC19 is connected 5 pin (in-phase input end) of voltage comparator ic 2B, and 6 pin of voltage comparator ic 2B link to each other with the benchmark setting voltage jointly with 3 pin.The driving amplifying circuit that the 7 pin output terminals of voltage comparator ic 2B are formed by current-limiting resistance R36 and Q8, R35, R34 and accessory power supply VSB is connected the base stage of the Q6 of control circuit, the turn-on and turn-off of control Q6.7 pin of voltage comparator ic 2B are formed the chain rate that stagnates than circuit also by R38, R43, RJ12 and Q7.When intelligent switch power source output miniwatt, the 2 pin voltages of voltage comparator ic 2A are less than 3 pin voltages, the 1 pin output-30V of voltage comparator ic 2A, (the reference ground voltage of power-sensing circuit for-35V) the EC19 cathode voltage is stabilized in-30V, the 7 pin output high level of LM393, Q7, Q8 equal conducting this moment, Q6 by.When intelligent switch power source is exported when high-power, 2 pin voltages are greater than 3 pin voltages, 1 pin output-35V, and EC19 discharges by R39, through 100ms, 5 pin voltages are reduced to below the 6 pin benchmark setting voltages, 7 pin output-35V low levels, Q7, Q8 end, and produce the overpower signal, make the Q6 conducting.
With reference to Fig. 4, the effect of the PDM keyer TL494 of control circuit is to produce driving pulse, and pulse signal is through Q1, the Q2 operate as normal of amplifying, T2 is coupled the rear drive translation circuit.After 12 pin (power end) of TL494 power on, its 14 pin output-30V reference voltage, (the reference ground voltage of control circuit is-35V, reference voltage relative reference ground for+5V) and for circuit supply once or set up reference voltage:
1) 8 pin (feeder ear) for the voltage comparator LM393 in the power-sensing circuit provide-30V voltage.
2) potential-divider network of forming through resistance R J11, RJ12, RJ13 is that 3,6 pin of LM393 are set up the benchmark setting voltage.
3) potential-divider network of forming respectively through resistance R J3, RJ4, RJ7, RJ9, RJ10 is that 2,15 pin of TL494 are set up the benchmark setting voltage.
Under the TL494 normal operation, 8,11 pin output phases differ 180 ° drive pulse signal, through Q3, Q4 amplify and the T2 coupling after, drive Q1, Q2 and take turns conducting work.4 pin of TL494 (dead band control end) external capacitor EC17 forms soft starting circuit with resistance R 26, and when power supply electrifying, the EC17 both end voltage can not be suddenlyd change, and is risen to gradually+5V by 0V, and 4 pin voltages descend gradually.4 pin voltages greater than-32V(to reference to ground greater than 3V) time, 8, the 11 pin no-output driving pulses of TL494.This moment, Q3, Q4 were respectively under the effect of direct current biasing resistance R 25, R24, be in the lightly conducting state, two pipe forward voltage produce equal and opposite in direction, opposite polarity induced voltage at T3 secondary 1,3 windings and 3,4 windings, Q1, Q2 do not have positive bias-voltage because of base stage to be ended, when the 4 pin voltages of TL494 be lower than gradually-during 32V, 8, the driving pulse that increases gradually of 11 pin output duty cycles drives the conducting of Q1, Q2, prevents the power supply electrifying surge impact of moment.C19 and RJ17 are external concussion resistance capacitance, connect 5 pin (CT) and 6 pin (RT) of TL494 respectively, can set the frequency of operation of TL494, and frequency of operation is 30KHz in this circuit.
When Switching Power Supply output power during less than 250W, the Q6 in the control circuit ends, and 2 pin (1IN-) voltage of TL494 is obtained through RJ7 and RJ10 dividing potential drop by 14 pin (Vref).Output voltage+35V is through RJ1, RJ2 and RJ8 dividing potential drop, be connected to 1 pin (1IN+) of TL494, the feedback voltage of 1 pin of TL494 and the setting voltage of 2 pin compare and enlarge by internal error amplifier I, and then the dutycycle of 8 pin (C1) of control TL494 and 11 pin (C2) output.The final stable output of voltage that realizes Switching Power Supply.When intelligent switch power source output power during greater than 250W, power-sensing circuit produces the overpower signal, Q6 conducting in the Drive and Control Circuit, RJ9 and RJ10 parallel connection, the potential-divider network that RJ9, RJ10 and RJ7 form reduces 2 pin (IN-) the benchmark setting voltage of TL494, the internal error amplifier I of TL494 compares and enlarges the benchmark setting voltage of the feedback voltage of 1 pin and 2 pin, reduce the dutycycle of 8 pin and 11 pin output, and then the output voltage of reduction Switching Power Supply, reach the reduction output power of power supply, the purpose of control system internal loss.
Claims (3)
1. the power consumption measuring and control method of sound system Switching Power Supply is characterized in that: the power detection controller is set in the Switching Power Supply of sound equipment power amplification system, and this power detection controller is by the real-time output power of detector switch power supply,
1) when the Switching Power Supply output power that detects the sound equipment power amplification system is equal to or less than the rated power of load, gauge tap power supply output burning voltage, and make output power be adapted to the variation of load automatically;
2) when the Switching Power Supply output power that detects the sound equipment power amplification system during greater than the rated power of load, produce an overpower signal, the output voltage of Switching Power Supply is reduced, output voltage is adjusted automatically, make output power be adapted to the variation of load automatically, reduce the internal system power attenuation;
3) when the proportional increase of main-transformer primary current, the power detection controller is taken a sample to the electric current on the former limit of Switching Power Supply main-transformer, and this sampling current and benchmark setting voltage are compared, and produces an overpower signal according to comparative result; The power detection controller changes error ratio benchmark setting voltage by the overpower signal, and then reduces the output duty cycle of the pulse-width modulation PWM of control circuit, finally reduces output voltage, and realization voltage is adjusted automatically;
4) produce an overpower signal as condition as described in the step 3), the power detection controller is taken a sample to the electric current on the former limit of Switching Power Supply main-transformer, overpower signal back benchmark setting voltage, form and stagnate chain rate, when output power raise, the voltage signal that is converted by current sampling signal reacted, reduces the output voltage of Switching Power Supply rapidly.
2. be used for the isolated plant of the power consumption measuring and control method of sound system Switching Power Supply, it is characterized in that: formed by power-sensing circuit and control circuit; The signal input part of power-sensing circuit is connected with the former limit of the main-transformer of Switching Power Supply winding, output terminal is connected with the input end of control circuit, and the signal output part of control circuit connects the signal input part of the translation circuit of Switching Power Supply; Power-sensing circuit is formed by connecting by current sampling unit, signal conversion unit, rectification filtering unit, reference voltage unit, voltage comparison unit, delay unit and stagnant ring element; Take a sample to the electric current on the former limit of Switching Power Supply main-transformer in the current sampling unit, the output terminal of current sampling unit connects a comparison input end of voltage comparison unit by signal conversion unit, rectification filtering unit, the output terminal of voltage comparison unit connects the input end of delay unit, the output terminal of delay unit is by the input end of the ring element connection reference voltage unit that stagnates, and the output terminal of reference voltage unit connects a comparison input end of voltage comparison unit; Control circuit is formed by connecting by sampling voltage unit, benchmark setup unit, error amplifying unit and PWM control module; The input end of benchmark setup unit connects the output terminal of delay unit, the output terminal of the output terminal of benchmark setup unit, sampling voltage unit respectively connects an input end of error amplifying unit, the output terminal of error amplifying unit connects the input end of PWM control module, the output terminal of PWM control module is as the signal input part of the translation circuit of the signal output part connection Switching Power Supply of control circuit, output pulse control signal.
3. the isolated plant of the power consumption measuring and control method for the sound system Switching Power Supply as claimed in claim 2, it is characterized in that: power-sensing circuit is formed by connecting by current transformer, resistance R 34～R43, precision resistance RJ12, capacitor C 22, electrochemical capacitor EC18～EC19, diode D19, triode Q6～Q8 and voltage comparator chip IC 2A～IC2B; Behind current transformer and the connecting resistance R42 and by diode D19, resistance R 41, polarity free capacitor C22 is connected with the RC filtering circuit that electrochemical capacitor EC18 constitutes, the inverting input of the output termination voltage comparator ic 2A of RC filtering circuit, the normal phase input end of voltage comparator ic 2A connects the benchmark setting voltage, the output terminal of voltage comparator ic 2A is by being connected the in-phase input end of voltage comparator ic 2B with the delay circuit that electrochemical capacitor EC19 forms by resistance R 39, the reverse input end of voltage comparator ic 2B links to each other with the benchmark setting voltage, and the output terminal of voltage comparator ic 2B passes through by current-limiting resistance R36, triode Q8, resistance R 35, resistance R 34 is connected the base stage of the triode Q6 of control circuit with the driving amplifying circuit that accessory power supply is formed; The output terminal of voltage comparator ic 2B also connects the base stage of triode Q7 by resistance R 38, triode Q7 emitter connects the normal phase input end of voltage comparator ic 2A by precision resistance RJ12, resistance R 43 be connected across triode Q7 collector, increase between the utmost point, form the chain rate that stagnates than circuit; Control circuit comprises a PWM control module and an error amplifying unit, the inverting input of error amplifying unit is connected with the signal output part of power-sensing circuit by potential-divider network and the triode Q6 that is made up of respectively resistance R J3, RJ4, RJ7, RJ9, RJ10, wherein, the potential-divider network of forming through resistance R J3, RJ4, RJ7, RJ9, RJ10 is that the 2nd, 15 pin of TL494 are set up the benchmark setting voltage, and the potential-divider network of forming through resistance R J7, RJ9, RJ10 is that the 2nd pin of TL494 is set up the benchmark setting voltage; Its in-phase input end connects the sampled voltage of Switching Power Supply output.
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| CN2545738Y (en) * | 2002-01-11 | 2003-04-16 | 范国塔 | Automatic protection and failure warning device of power amplifier |
| CN1700552A (en) * | 2005-04-07 | 2005-11-23 | 崇贸科技股份有限公司 | Overpower protector of self-excitation power supply |
| CN1897388A (en) * | 2006-05-09 | 2007-01-17 | 苏州市华芯微电子有限公司 | Actuating power-supply over-consumption protection and protecting circuit |
-
2008
- 2008-01-22 CN CN 200810025960 patent/CN101226411B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2545738Y (en) * | 2002-01-11 | 2003-04-16 | 范国塔 | Automatic protection and failure warning device of power amplifier |
| CN1700552A (en) * | 2005-04-07 | 2005-11-23 | 崇贸科技股份有限公司 | Overpower protector of self-excitation power supply |
| CN1897388A (en) * | 2006-05-09 | 2007-01-17 | 苏州市华芯微电子有限公司 | Actuating power-supply over-consumption protection and protecting circuit |
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| Publication number | Publication date |
|---|---|
| CN101226411A (en) | 2008-07-23 |
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Denomination of invention: Power consumption measuring and control method for sound system switch power source as well as special device thereof Effective date of registration: 20170720 Granted publication date: 20130925 Pledgee: Shunde Guangdong rural commercial bank Limited by Share Ltd. Pledgor: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY Co.,Ltd.|FOSHAN REAL-DESIGN SOFTWARE TECHNOLOGY Co.,Ltd. Registration number: 2017440000053 |
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Denomination of invention: Power consumption measurement and control method and dedicated device for audio system switching power supply Effective date of registration: 20230725 Granted publication date: 20130925 Pledgee: Shunde Guangdong rural commercial bank Limited by Share Ltd. Pledgor: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2023980049766 |