CN108063559B - Standby state ultra-low power consumption power supply - Google Patents
Standby state ultra-low power consumption power supply Download PDFInfo
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- CN108063559B CN108063559B CN201711161069.2A CN201711161069A CN108063559B CN 108063559 B CN108063559 B CN 108063559B CN 201711161069 A CN201711161069 A CN 201711161069A CN 108063559 B CN108063559 B CN 108063559B
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- 238000000034 method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 102100035769 Apoptotic chromatin condensation inducer in the nucleus Human genes 0.000 claims 1
- 101000929927 Homo sapiens Apoptotic chromatin condensation inducer in the nucleus Proteins 0.000 claims 1
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- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
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- 230000001960 triggered effect Effects 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/1555—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit
- H02M7/1557—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit with automatic control of the output voltage or current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
- H02M1/0035—Control circuits allowing low power mode operation, e.g. in standby mode using burst mode control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention discloses an ultra-low power consumption power supply in a standby state, which comprises a transformer TA, a switching circuit, a direct current power supply circuit, a control unit and a common orthogonal current sampling circuit, wherein a software module for load detection is arranged in the control unit and is operated as follows: step 1: when the transformer is in an idle state, the switching circuit disconnects the TA of the transformer from power off; step 2: the control unit sends out a pulse signal every other time period T1 to turn on the switch circuit, and the common orthogonal flow sampling circuit obtains a sampling signal V1 and sends the sampling signal V1 to the control unit; and step 3: the control unit compares the sampling signal V1 with a pre-stored idle threshold V2 to indicate that a load exists, modulates the PWM signal according to the magnitude of the sampling signal V1, and returns to the step 1 if the load does not exist. The circuit has the advantages of simple structure, small volume, sensitive response, low cost and more perfect function.
Description
Technical Field
The invention relates to an ultra-low power consumption power supply in a standby state, in particular to a control circuit of an illuminating lamp.
Background
Along with the continuous improvement of the requirements of various countries in the world on the energy protection and the utilization rate, the energy efficiency standard is also continuously improved, and particularly, the requirements on the no-load loss and the conversion efficiency of electronic and electric products are greatly improved. The internal structure of the traditional transformer is basically composed of a primary coil, a secondary coil and silicon steel sheets, copper loss and eddy current loss are inevitably generated, no-load standby power consumption is large under the condition that the transformer is electrified and is not connected with a load, for example, the standby power consumption of a 300W transformer is generally 4-5W, the conventional control technology adopts relay control, and the on-off or timing switch control of the transformer is mainly realized, but the problem of the no-load power of the transformer cannot be solved by the control technology.
In addition, the power supply with the transformer no-load detection function developed by the inventor at present needs to detect the output of the secondary coil of the transformer, and the power supply has the advantages of large load of circuit structure, large volume, high cost and incomplete function and needs to be further improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the standby state ultra-low power consumption power supply, which can realize the accurate load detection function, and has the advantages of simple circuit structure, small volume, low cost and more perfect function.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a standby state ultra-low power consumption power supply comprises a transformer TA and a switch circuit, the DC power supply circuit comprises a DC power supply circuit, a control unit and a common-orthogonal-current sampling circuit, wherein AC input ends AC IN1 and AC IN2 are connected with an input port of the DC power supply circuit, an output port of the DC power supply circuit outputs DC voltage Vcc, the DC power supply circuit provides DC power for the control unit and the common-orthogonal-current sampling circuit, two ends of a primary coil of a transformer TA are respectively connected with AC input ends AC IN1 and AC IN2 after being connected with a switching circuit IN series, two ends of a secondary coil of the transformer TA provide AC power for a load, a signal input end B1 of the common-orthogonal-current sampling circuit is connected on a branch of the primary coil of the transformer TA connected with the switching circuit IN series, a signal output end DET of the common-orthogonal-current sampling circuit is connected to an input end of the control unit, and an output end of; the control unit is internally provided with a software module for load detection, and the software module operates as follows:
step 1: when the transformer is in a no-load state, the control unit stops outputting signals to the switching circuit to disconnect the switching circuit, and the transformer TA is powered off and does not work to reduce no-load energy consumption;
step 2: the control unit sends out a pulse signal every other time period T1, the pulse signal enables the switch circuit to be conducted in a time period T2, the common orthogonal flow sampling circuit completes sampling in a time period T2, a sampling signal V1 is obtained, and the sampling signal V1 is sent to the control unit;
and step 3: the control unit compares the sampling signal V1 with a pre-stored idle threshold V2, if the sampling signal V1 is larger than the idle threshold V2, a load is indicated, the control unit modulates a PWM signal according to the magnitude of the sampling signal V1, outputs continuous PWM to enable the switch circuit to be conducted to supply power for the load, and if the sampling signal V1 is smaller than the idle threshold V2, returns to the step 1.
When there is a load in the step 3, the control unit modulates the PWM signal according to the magnitude of the sampling signal V1, and the control unit outputs continuous PWM to turn on the switching circuit to supply power to the load, and the step 4 is further connected to: the co-orthogonal flow sampling circuit acquires the sampling signal V1 again every other time period T3 and sends the sampling signal V1 to the control unit; the control unit compares the sampling signal V1 with a pre-stored idle threshold V2 again, if the sampling signal V1 is greater than the idle threshold V2, indicating that a load exists, and returns to the step 3; and if the sampling signal V1 is smaller than the idle threshold value V2, the state is indicated to be in an idle state, and the step 1 is returned.
The common orthogonal current sampling circuit comprises a triode Q3, a triode Q4, a resistor R22, a resistor R23, a resistor R24, a resistor R25 and a capacitor C12, wherein the B pole of the triode Q3 is connected with the B pole of the triode Q4, the E pole of the triode Q3 is connected with one end of a resistor R22, the other end of the resistor R22 is connected with a direct-current voltage Vcc output by an output port of a direct-current power supply circuit and an alternating-current input end AC IN2, the E pole of the triode Q4 is connected with one end of a resistor R25, the other end of the resistor R25 is connected with the direct-current voltage Vcc output by the output port of the direct-current power supply circuit and an alternating-current input end AC IN2, the C pole of the triode Q3 is connected with the resistor R23 and then grounded, the C pole of the triode Q4 is connected with the resistor R24 and then grounded, two ends of the resistor R24 are connected with the capacitor C.
A voltage clamping loop is also connected in parallel between the two ends of the resistor R24.
The control unit is a single chip microcomputer MCU.
The control unit is also connected with a photosensitive detection circuit, the output end of the photosensitive detection circuit is connected with one input pin of the control unit, the control unit is also connected with an LED indicating lamp circuit, and one output end of the control unit is connected with the LED indicating lamp circuit.
The control unit is also connected with an alternating current zero-crossing detection circuit, the input end of the alternating current zero-crossing detection circuit is connected to the alternating current input end, the output end of the alternating current zero-crossing detection circuit is connected to the input pin of the control unit, and the control unit synchronously outputs a PWM signal for driving the switch circuit according to a zero-crossing point signal of the alternating current zero-crossing detection circuit so as to improve the power supply efficiency.
The invention has the beneficial effects that:
1. according to the invention, the co-orthogonal current sampling circuit is adopted to carry out alternating current sampling signals, and the signal input end B1 of the co-orthogonal current sampling circuit is connected to the primary coil of the transformer TA and the switch circuit series branch circuit, so that the circuit has the advantages of simple structure, small volume, sensitive response and low cost; when the transformer is in a no-load state, the control unit stops outputting signals to the switching circuit to disconnect the switching circuit, and the transformer TA is powered off and does not work to reduce no-load energy consumption; the control unit sends out a pulse signal every other time period T1, the pulse signal enables the switch circuit to be conducted in a time period T2, the common orthogonal flow sampling circuit completes sampling in a time period T2, a sampling signal V1 is obtained, and the sampling signal V1 is sent to the control unit; the control unit compares the sampling signal V1 with a pre-stored idle threshold V2, if the sampling signal V1 is larger than the idle threshold V2, a load is indicated, the control unit modulates a PWM signal according to the magnitude of the sampling signal V1, outputs continuous PWM to enable a switching circuit to be conducted to supply power for the load, and if the sampling signal V1 is smaller than the idle threshold V2, the load detection function is complete, and the control is simple and reasonable;
2) the common orthogonal flow sampling circuit is used as the basis of no-load detection and PWM signal modulation detection, the circuit structure is simplified, and the cost is reduced.
3) The common-orthogonal current sampling circuit effectively utilizes the working principle of a mirror circuit, can introduce an alternating current input signal on the basis of a basic mirror circuit structure, can superpose the positive half cycle of alternating current and static working direct current to establish a sampling signal and improve the precision of the signal, and can amplify the sampling current in a current proportion by connecting the resistance value proportional relation of two resistors of an emitter in series through the basic mirror circuit working principle and then filter the sampling current through a capacitor so as to output a variable direct current level. According to the change of the direct current level, different currents are detected through the sampling resistor R22 according to different loads, and the C12 obtains different direct current levels after RC charging.
4. The design of the common-orthogonal-current sampling circuit adopts a basic circuit framework of a mirror current source, an alternating current sampling signal is amplified and output through the mirror current source, the temperature drift of a system can be effectively inhibited, the output level can not change along with the change of the temperature of the whole machine, when the load is increased, the temperature of the whole machine is increased to increase the temperature of an internal circuit, the mirror circuit has a negative temperature compensation function, the output level can slightly change along with the temperature change of the whole machine through a protection circuit, and the temperature drift compensation function is realized, so that the working point is stabilized, the real-time detection is effectively carried out, and the sampling protection is accurate.
5. The two ends of the resistor R24 are also connected in parallel with a voltage clamping loop, the voltage clamping loop is formed by connecting the diode D6 and the resistor R27 in series, the phenomenon that the voltage of the signal output end DETECT of the common orthogonal current sampling circuit is too large to protect electronic devices is avoided, and meanwhile, the phenomenon that the output voltage difference of the signal output end DETECT is too large when the signal output end DETECT is in no-load and overload conditions and is not beneficial to detection is avoided.
6. The alternating-current zero-crossing detection circuit outputs a synchronous signal, the bidirectional thyristor Q1 of the switching circuit can be ensured to be in ZVS zero-voltage switching-on, the service life of the bidirectional thyristor Q1 is greatly prolonged, transient response pulse control takes the synchronous signal as a time sequence reference, and positive and negative half cycles are alternately triggered and switched on, so that electromagnetic energy release inside the transformer TA is effectively ensured.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a block diagram of a first embodiment of the present invention;
FIG. 2 is a detailed circuit diagram corresponding to FIG. 1;
FIG. 3 is a circuit block diagram of a second embodiment of the present invention;
fig. 4 is a software control flow diagram of the load detection of the present invention.
Detailed Description
The first embodiment is as follows:
referring to fig. 1, a lamp controller includes a transformer TA and a switching circuit, the DC power supply circuit comprises a DC power supply circuit, a control unit and a common-orthogonal-current sampling circuit, wherein AC input ends AC IN1 and AC IN2 are connected with an input port of the DC power supply circuit, an output port of the DC power supply circuit outputs a DC voltage Vcc, the DC power supply circuit provides DC power for the control unit and the common-orthogonal-current sampling circuit, two ends of a primary coil of a transformer TA are respectively connected with the AC input ends AC IN1 and AC IN2 after being connected with a switching circuit IN series, two ends of a secondary coil of the transformer TA provide AC power for a load, a signal input end B1 of the common-orthogonal-current sampling circuit is connected on a branch of the primary coil of the transformer TA connected with the switching circuit IN series, a signal output end DET of the common-orthogonal-current sampling circuit is connected to an input end of the control unit, and an output.
As shown IN fig. 2, the common quadrature current sampling circuit includes a transistor Q3, a transistor Q4, a resistor R22, a resistor R23, a resistor R24, a resistor R25, and a capacitor C12, a B-pole of the transistor Q3 is connected to a B-pole of the transistor Q4, an E-pole of the transistor Q3 is connected to one end of the resistor R22, another end of the resistor R22 is connected to a dc voltage Vcc output from an output port of the dc power supply circuit and an AC input terminal AC IN2, an E-pole of the transistor Q4 is connected to one end of the resistor R25, another end of the resistor R25 is connected to a dc voltage Vcc output from an output port of the dc power supply circuit and an AC input terminal AC IN2, a C-pole of the transistor Q3 is connected to the resistor R23 and then grounded, a C-pole of the transistor Q4 is connected to the resistor R24 and then grounded, two ends of the resistor R24 are connected to the capacitor C12 IN parallel, and a.
The switching circuit comprises a bidirectional thyristor Q1, a resistor R2, a potentiometer VR1 and a capacitor C18, wherein the potentiometer VR1 is connected between a T1 end and a T2 end of the bidirectional thyristor Q1, and the capacitor C18 is connected between the T2 end and a G end; the T1 of the thyristor Q1 is connected with the primary coil of the transformer TA; one end of the resistor R2 is connected with the G end of the bidirectional thyristor Q1, and the other end of the resistor R2 is connected with a signal output pin of the control unit; the T2 end of the thyristor Q1 is connected between the E pole of the triode Q3 and the resistor R22.
The control unit is a single chip microcomputer MCU, the control unit mainly comprises a chip U2, the control unit is also connected with a photosensitive detection circuit, and the output end of the photosensitive detection circuit is connected with an input pin 2 of a chip U2 of the control unit. The photosensitive detection circuit is formed by connecting a photosensitive diode LED3 and a capacitor C7 in parallel, and after the photosensitive diode LED3 and the capacitor C7 are connected in parallel, two ends of the photosensitive detection circuit are connected with Vcc and ground.
The control unit is further connected with an LED indicating lamp circuit, one output end of the control unit is connected with the LED indicating lamp circuit, the LED indicating lamp circuit comprises a light emitting diode D8, a resistor R18 and a resistor R19, and an output pin 7 of a chip U2 of the control unit outputs signals to control the LED indicating lamp circuit.
The direct-current power supply circuit comprises a rheostat VR2, rectifier diodes D2, D3, a resistor R4, a capacitor C10, a capacitor C11, a capacitor C1 and a voltage-stabilizing diode Z1. A dc supply voltage Vcc of 5V is provided.
The alternating current zero-crossing detection circuit comprises a resistor R5, a resistor R6 and a voltage stabilizing diode Z2, wherein the output end of the alternating current zero-crossing detection circuit is connected to an input pin of the control unit, so that a PWM signal output to the switching circuit by the control unit is synchronous with alternating current input, the bidirectional thyristor Q1 of the switching circuit can be ensured to be switched on at ZVS zero voltage, the service life of the bidirectional thyristor Q1 is greatly prolonged, transient response pulse control takes a synchronous signal as a time sequence reference, positive and negative half cycles are alternately triggered and switched on in turn, and the electromagnetic energy release in the transformer TA is effectively ensured.
The working principle of the invention is as follows: during static work, the positive pole of 5V direct current Vcc flows to ground through a resistor R22, a triode Q3 and a resistor R23, the resistance of the resistor R23 is large, so that the branch current is small, the current flowing through the resistor R2 is small, the voltage at two ends of the resistor R22 is equal to the voltage at two ends of the resistor R25, the current of the two ends is in proportional relation, and the current flowing through the resistor R25 is also small. The capacitor C12 is also charged very little, and the quiescent voltage across the capacitor C12 is very low (well below the 2.5V threshold level).
When the load works, alternating current passes through the resistor R22 and the triode Q1 to form a channel, the current is increased after the resistor R22 is superposed, according to the proportional relation, the current flowing through the resistor R25 is also increased, the current charges the capacitor C12, the voltage change of the capacitor C12 is changed according to the change of the load size, when the load is increased, the voltage of the capacitor C12 is increased, when the load is reduced, the voltage of the capacitor C12 is correspondingly reduced, the signal voltage is output to the control unit for real-time detection, when the load is abnormal, such as overload or short circuit, the voltage of the capacitor C12 is increased to exceed the threshold level (2.5V) allowed by the control unit, and the control unit outputs a low-level signal to the switching circuit to close the switching circuit, so that the triode Q1 is disconnected, and the purpose of abnormal protection is realized.
According to experimental detection, the signal output end DETECT of the common orthogonal flow sampling circuit in the idle state is 200 mV; when the load is 5 watts, the signal output terminal DETECT of the common orthogonal flow sampling circuit is 220mV, and when the load is 50 watts (full load), the signal output terminal DETECT of the common orthogonal flow sampling circuit is 2V; and when the common orthogonal flow sampling circuit is overloaded or short-circuited, the signal output end DETECT of the common orthogonal flow sampling circuit is 5V, so that the condition that the output voltage difference of the signal output end DETECT is overlarge during no-load and overload is unfavorable for detection is avoided. The two ends of the resistor R24 are also connected with a voltage clamping loop in parallel, the voltage clamping loop is formed by connecting a diode D6 and a resistor R27 in series, and the anode of the diode D6 is connected with the signal output end DETECT. Even in overload or short circuit, the signal output terminal DETECT of the co-orthogonal current sampling circuit is at most 2V, so that overlarge fluctuation is avoided.
The control unit is a single chip microcomputer, a software module for load detection is arranged in the control unit, and as shown in fig. 4, the software module operates as follows:
step 1: when the transformer is in a no-load state, the control unit stops outputting signals to the switching circuit to disconnect the switching circuit, and the transformer TA is powered off and does not work to reduce no-load energy consumption;
step 2: the control unit sends out a pulse signal every other time period T1, the pulse signal enables the switch circuit to be conducted in a time period T2, the common orthogonal flow sampling circuit completes sampling in a time period T2, a sampling signal V1 is obtained, and the sampling signal V1 is sent to the control unit; in actual operation, the time period T1 is set to 5 seconds, and the time T2 may be set to 1 second, which may be set according to specific situations.
And step 3: the control unit compares the sampling signal V1 with a pre-stored idle threshold V2, if the sampling signal V1 is larger than the idle threshold V2, a load is indicated, the control unit modulates a PWM signal according to the magnitude of the sampling signal V1, outputs continuous PWM to enable the switch circuit to be conducted to supply power for the load, and if the sampling signal V1 is smaller than the idle threshold V2, returns to the step 1.
When a load exists in the step 3, the control unit modulates the PWM signal according to the magnitude of the sampling signal V1, and in the process that the control unit outputs continuous PWM to enable the switching circuit to be switched on to supply power to the load, the control unit is also connected with the step 4: the co-orthogonal flow sampling circuit acquires the sampling signal V1 again every other time period T3 and sends the sampling signal V1 to the control unit; the control unit compares the sampling signal V1 with a pre-stored idle threshold V2 again, if the sampling signal V1 is greater than the idle threshold V2, indicating that a load exists, and returns to the step 3; and if the sampling signal V1 is smaller than the idle threshold value V2, the state is indicated to be in an idle state, and the step 1 is returned. The time period T3 may be set to 3 seconds, and may be freely set according to circumstances.
The empty load threshold V2 is an experimental measurement or an estimated value based on experimental data, which is stored in the control unit.
When a load exists, the control unit modulates PWM signals with different occupancy ratios according to the size of the signal output end DETECT of the common orthogonal current sampling circuit so as to control the conduction angle of the bidirectional thyristor Q1, so that the load obtains proper electric energy and the electric energy is saved to the maximum extent.
As shown in fig. 3, the circuit structure of this embodiment is basically the same as that of the first embodiment, and the difference is that: a signal amplifying circuit is additionally arranged between the signal output end DETECT of the common orthogonal flow sampling circuit and the input end of the control unit. Because the range of the output signal of the signal output terminal DETECT of the common orthogonal stream sampling circuit is between 200mV and 2V, the detection can be quickly and accurately carried out when the signal output terminal DETECT outputs a small voltage, and the detection sensitivity is improved.
Claims (6)
1. A standby state ultra-low power consumption power supply comprises a transformer TA and a switch circuit, the DC power supply circuit comprises a DC power supply circuit, a control unit and a common-orthogonal-current sampling circuit, wherein AC input ends AC IN1 and AC IN2 are connected with an input port of the DC power supply circuit, an output port of the DC power supply circuit outputs DC voltage Vcc, the DC power supply circuit provides DC power for the control unit and the common-orthogonal-current sampling circuit, two ends of a primary coil of a transformer TA are respectively connected with an AC input end ACIN1 and an AC IN2 after being connected with a switching circuit IN series, two ends of a secondary coil of the transformer TA provide AC power for a load, a signal input end B1 of the common-orthogonal-current sampling circuit is connected on a branch of the primary coil of the transformer TA connected with the switching circuit IN series, a signal output end DET of the common-orthogonal-current sampling circuit is connected to an input end of the control unit, and an output; the method is characterized in that: the control unit is internally provided with a software module for load detection, and the software module operates as follows:
step 1: when the transformer is in a no-load state, the control unit stops outputting signals to the switching circuit to disconnect the switching circuit, and the transformer TA is powered off and does not work to reduce no-load energy consumption;
step 2: the control unit sends out a pulse signal every other time period T1, the pulse signal enables the switch circuit to be conducted in a time period T2, the common orthogonal flow sampling circuit completes sampling in a time period T2, a sampling signal V1 is obtained, and the sampling signal V1 is sent to the control unit;
and step 3: the control unit compares the sampling signal V1 with a pre-stored no-load threshold V2, if the sampling signal V1 is larger than the no-load threshold V2, a load is indicated, the control unit modulates a PWM signal according to the magnitude of the sampling signal V1, outputs continuous PWM to enable a switching circuit to be conducted to supply power to the load, and if the sampling signal V1 is smaller than the no-load threshold V2, returns to the step 1;
the common orthogonal current sampling circuit comprises a triode Q3, a triode Q4, a resistor R22, a resistor R23, a resistor R24, a resistor R25 and a capacitor C12, wherein the B pole of the triode Q3 is connected with the B pole of the triode Q4, the E pole of the triode Q3 is connected with one end of a resistor R22, the other end of the resistor R22 is connected with a direct-current voltage Vcc output by an output port of a direct-current power supply circuit and an alternating-current input end ACIN2, the E pole of the triode Q4 is connected with one end of a resistor R25, the other end of the resistor R25 is connected with the direct-current voltage Vcc output by the output port of the direct-current power supply circuit and an alternating-current input end AC IN2, the C pole of the triode Q3 is connected with the resistor R23 and then grounded, the C pole of the triode Q4 is connected with the resistor R24 and then grounded, two ends of the resistor R24 are connected with the capacitor.
2. A standby state ultra low power consumption power supply according to claim 1, wherein: when a load exists in the step 3, the control unit modulates the PWM signal according to the magnitude of the sampling signal V1, and in the process that the control unit outputs continuous PWM to enable the switching circuit to be switched on to supply power to the load, the control unit is also connected with the step 4: the co-orthogonal flow sampling circuit acquires the sampling signal V1 again every other time period T3 and sends the sampling signal V1 to the control unit; the control unit compares the sampling signal V1 with a pre-stored idle threshold V2 again, if the sampling signal V1 is greater than the idle threshold V2, indicating that a load exists, and returns to the step 3; and if the sampling signal V1 is smaller than the idle threshold value V2, the state is indicated to be in an idle state, and the step 1 is returned.
3. A standby state ultra low power consumption power supply according to claim 2, wherein: a voltage clamping loop is also connected in parallel across resistor R24.
4. A standby state ultra low power consumption power supply according to claim 3, wherein: the control unit is a singlechip MCU.
5. The standby state ultra low power consumption power supply of claim 4, wherein: the control unit is also connected with a photosensitive detection circuit, the output end of the photosensitive detection circuit is connected with an input pin of the control unit, the control unit is also connected with an LED indicating lamp circuit, and one output end of the control unit is connected with the LED indicating lamp circuit.
6. The standby state ultra low power consumption power supply of claim 5, wherein: the control unit is also connected with an alternating current zero-crossing detection circuit, the input end of the alternating current zero-crossing detection circuit is connected to the alternating current input end, the output end of the alternating current zero-crossing detection circuit is connected to the input pin of the control unit, and the control unit synchronously outputs a PWM (pulse width modulation) signal for driving the switch circuit according to a zero-crossing point signal of the alternating current zero-crossing detection circuit so as to improve the power efficiency.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102421226A (en) * | 2011-09-06 | 2012-04-18 | 上海新进半导体制造有限公司 | LED (light-emitting diode) dimming driving circuit |
| CN102648575A (en) * | 2009-09-21 | 2012-08-22 | 欧司朗股份有限公司 | Circuit arrangement for operating at least one LED |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200976549Y (en) * | 2006-09-22 | 2007-11-14 | 何曙光 | Ultra-low power consumption standing circuit |
| CN101957646B (en) * | 2009-07-14 | 2015-02-25 | 钱和革 | Computer power supply for quasi-zero-power consumption standby |
| CN205754991U (en) * | 2016-05-13 | 2016-11-30 | 中山市尊宝实业有限公司 | A kind of inside and outside light sensing switch circuit of identification automatically |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102648575A (en) * | 2009-09-21 | 2012-08-22 | 欧司朗股份有限公司 | Circuit arrangement for operating at least one LED |
| CN102421226A (en) * | 2011-09-06 | 2012-04-18 | 上海新进半导体制造有限公司 | LED (light-emitting diode) dimming driving circuit |
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