CN111830424A - Load state detection device - Google Patents
Load state detection device Download PDFInfo
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- CN111830424A CN111830424A CN201910249258.8A CN201910249258A CN111830424A CN 111830424 A CN111830424 A CN 111830424A CN 201910249258 A CN201910249258 A CN 201910249258A CN 111830424 A CN111830424 A CN 111830424A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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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
Abstract
The invention relates to a load state detection device, which comprises a detection unit, a rectification filter unit, an amplification unit and a comparison unit, wherein the detection unit comprises a current transformer, the primary side of the current transformer is used for receiving the main current of a power supply device and correspondingly outputting a sensing current at the secondary side, the voltage is converted into a voltage through the rectification filter unit and the amplification unit, the comparison unit compares the voltage with a reference voltage, the comparison result can judge whether the output load of the power supply device enters a light load state, if so, the comparison unit outputs a light load signal, and the light load signal can be used for other control applications, such as controlling the power supply device to reduce power consumption to achieve the purpose.
Description
Technical Field
The present invention relates to a device for detecting load state, in particular, it relates to a detection device capable of judging that the output load is coming into light load state
Background
Power supply devices such as power converters and power supplies are used in a wide variety of fields, for example, industrial devices, consumer electronics, medical facilities, and the like, and in recent years, with increasing demands for energy saving and power saving, power supply devices are designed and developed to achieve high power conversion efficiency and low power consumption. For relatively small and low power supply switching, a good circuit design is needed to avoid additional power consumption.
The operation status of the power supply device can be roughly classified into full load, light load, no load, etc., and different power consumption performances are required in different statuses, so a related detection circuit is usually designed in the power supply device to determine the current operating status. For example, when the power supply device is operated in a light load to no-load state, if part of the electronic components can be turned off, the effect of reducing the power consumption of the whole device can be achieved.
The design of some power devices generally uses a resistance element to sense current, and determines the operating state of the device according to the current sensing result, but sensing by using the resistance element usually generates more power consumption, which is not favorable for realizing the green energy requirement of the power device.
Disclosure of Invention
The present invention provides a load state detection device for detecting whether an output load of a power supply device is in a light load state, and outputting a light load signal when the output load is determined to be in the light load state.
To achieve the above object, the load status detecting device of the present invention is applied to a power supply device for detecting an output load of the power supply device, and the load status detecting device includes:
the detection unit comprises a current transformer, wherein the primary side of the current transformer is used for detecting an input current and correspondingly generating a sensing current at the secondary side;
the rectifying and filtering unit is connected with the detection unit and generates a first voltage according to the sensing current;
the amplifying unit is connected with the rectifying and filtering unit to amplify the first voltage to generate a second voltage;
and the comparison unit is connected with the amplification unit and compares the second voltage with a reference voltage to obtain a comparison result, and determines whether to output a light-load signal according to the comparison result, wherein the light-load signal is used for indicating that the output load is in a light-load state.
Preferably, the rectifying and filtering unit includes:
the anode of the rectifying diode is connected with the secondary side of the current transformer and allows the sensing current to pass through the rectifying diode;
a first capacitor and a first resistor are connected in parallel and then connected between the negative electrode of the rectifier diode and the ground.
Preferably, the amplifying unit includes an operational amplifier, a non-inverting input terminal of which is connected to the cathode of the rectifying diode, the operational amplifier amplifies the first voltage, and outputs the second voltage at an output terminal of the operational amplifier.
Preferably, the comparing unit includes a comparator, one input terminal of which receives the reference voltage, the other input terminal of which receives the second voltage, and an output terminal of which is used for outputting the light load signal.
Preferably, a positive input terminal of the comparator is connected to a voltage dividing circuit to receive the reference voltage generated by the voltage dividing circuit; the negative input end of the comparator is connected with the output end of the operational amplifier to receive the second voltage.
Preferably, the rectifying and filtering unit further comprises:
the second resistor is connected between the anode of the rectifying diode and the secondary side of the current transformer in series;
a third resistor connected across the secondary side of the current transformer.
Preferably, the voltage divider circuit includes a fourth resistor and a fifth resistor, the fourth resistor and the fifth resistor are connected in series between a working voltage and ground, wherein a series node of the fourth resistor and the fifth resistor is a voltage dividing node.
Preferably, the comparison unit further comprises a hysteresis circuit, the hysteresis circuit comprising a diode, a sixth resistor and a seventh resistor; the diode and the sixth resistor are connected in series and then connected between the output end of the comparator and the positive input end of the comparator; the seventh resistor is connected between the positive input end of the comparator and the voltage dividing node of the voltage dividing circuit in a bridging mode.
Preferably, a second capacitor is connected between the non-inverting input terminal of the operational amplifier and the ground; a third capacitor is connected between the inverting input terminal and the output terminal of the operational amplifier.
Preferably, when the second voltage is lower than the reference voltage, the comparator outputs the light-load signal with a high level.
The invention uses the detecting unit formed by the current transformer to detect the current in the power supply device, for example, the main current of the power supply device, the main current can be taken from the current of the primary side of the transformer of the power supply device, the current of the primary side of the transformer is converted into the voltage, and then the voltage is compared with the reference voltage, thereby judging whether the output load of the power supply device is in the light load state. If the load is light, a light load signal is output for a subsequent circuit, for example, the light load signal is used for controlling a switch on the secondary side of the transformer to reduce the consumed current, so as to achieve the green energy requirement of reducing the power consumption.
Drawings
Fig. 1 is a detailed circuit diagram of the load state detection device of the present invention.
FIG. 2 is a detailed circuit diagram of the load status detecting device applied in a power device according to the present invention.
FIG. 3 is a diagram illustrating waveforms associated with the circuit of FIG. 2.
Wherein, the reference numbers:
load state detection device 100
Current transformer 11
Rectifying and filtering unit 20
Operational amplifier 31
Comparison unit 40
Transformer 210
Voltage divider circuit 42
A first voltage V1
A second voltage V2
Reference voltage Vref
Rectifier diode D1
First capacitor C1
Second capacitance C2
Third capacitor C3
Fourth capacitance C4
First resistor R1
Second resistor R2
Third resistor R3
Fourth resistor R4
Fifth resistor R5
Sixth resistor R6
Seventh resistor R7
Diode D2
First changeover switch QA
Second change-over switch QB
First control signal VOA
Second control signal VOB
Detailed Description
The technical means adopted by the invention to achieve the predetermined object of the invention are further described below with reference to the drawings and the preferred embodiments of the invention.
Referring to fig. 1, the present invention is a load status detecting apparatus 100, which includes a detecting unit 10, a rectifying and filtering unit 20, an amplifying unit 30, and a comparing unit 40.
The detecting unit 10 has a Current Transformer (CT)11, a primary side of which is used to receive an input current, and a secondary side of which correspondingly outputs an induced current according to the magnitude of the input current.
The rectifying and filtering unit 20 is connected to the output of the detecting unit 10, and generates a first voltage V according to the induced current output by the detecting unit 101. The rectifying and filtering unit 20 includes a rectifying diode D1, a first capacitor C1 and a first resistor R1, wherein the anode of the rectifying diode D1 is connected to the output of the detecting unit 10, i.e., the secondary side of the current transformer 11, so that the induced current can pass through the rectifying diode D1. The negative electrode of the rectifying diode D1 is connected to the first capacitor C1 and the first resistor R1 in parallel, and the first capacitor C1 is capable of applying a first voltage V1Providing a stabilizing effect to stabilize the first voltage V1And stable direct-current voltage is presented, and unstable states of voltage fluctuation are avoided. In the present embodiment, the rectifying-filtering unit 20 further includes a second resistor R2 and a third resistor R3, and the second resistor R2 is connected to the rectifierThe third resistor R3 is connected across the secondary side of the current transformer 11 between the anode of the current diode D1 and the secondary side of the current transformer 11. The first voltage V1And the negative pole of the self-rectifying diode D1.
The amplifying unit 30 is connected to the output of the rectifying and filtering unit 20 for amplifying the first voltage V1To generate a second voltage V2. The amplifying unit 30 is mainly composed of an operational amplifier 31, the non-inverting input terminal of the operational amplifier 31 is connected to the cathode of the rectifying diode D1, and the second voltage V2The output of the operational amplifier 31 is output to the comparison unit 40 of the next stage. To reduce noise, a second capacitor C2 may be connected between the non-inverting input and ground, and a third capacitor C3 may be connected between the inverting input and the output of the operational amplifier 31.
The comparison unit 40 compares the second voltage V2And a reference voltage VrefAnd comparing to judge whether the output load is in a light load state. The comparing unit 40 has a comparator 41, and an input terminal of the comparator 41 receives the second voltage V2The other input terminal receives a reference voltage VrefIn the present embodiment, the negative input terminal of the comparator 41 receives the second voltage V according to the design requirement of the circuit2The positive input terminal of the comparator 41 receives the reference voltage VrefWhen the second voltage V is applied2Is less than the reference voltage VrefThe comparator 41 will output a high-level light-load signal indicating that the output load is light-load, in order to increase the second voltage V2For stability and noise reduction, a fourth capacitor C4 may be disposed between the negative input terminal of the comparator 41 and ground to bypass noise. In other examples, the second voltage V may be varied according to the design requirements of the circuit2And a reference voltage VrefThe comparator 41 outputs a low-level light-load signal to indicate that the output load is in a light-load state. The reference voltage VrefCan be provided by a voltage divider circuit 42, which is composed of a fourth resistor R4 and a fifth resistor R5 connected in series, and the voltage divider circuit 42 divides the operating voltage VCC1 to obtain the reference voltage VrefThe reference voltage VrefTo the positive input of the comparator 41.
In the comparing unit 40, a hysteresis circuit may be further provided, and the hysteresis circuit includes a diode D2, a sixth resistor R6 and a seventh resistor R7. The diode D2 and the sixth resistor R6 are connected in series between the output terminal and the positive input terminal of the comparator 41, and the seventh resistor R7 is connected across the positive input terminal of the comparator 41 and the voltage dividing node of the voltage dividing circuit 42.
Referring to the power supply apparatus shown in fig. 2, the power supply apparatus includes a transformer 210, a current detection unit 220, a main controller 230, an isolation driver 240, and a feedback unit 250.
The current detecting unit 220 is connected to a primary side (input side) of the transformer 210, the current detecting unit 220 may be a Current Transformer (CT) or a current sensing resistor, and the secondary side (output side) of the transformer 210 has a first switch QA and a second switch QB, which are connected to the output terminal + VO, -VO through the first switch QA and the second switch QB, and the output terminal + VO, -VO is connected to an output load.
The main controller 230 generates a set of control signals according to a current sensing signal output by the current detection unit 220 and a feedback signal FB output by the feedback unit 250, and determines the switching operations of the primary side switches QC and QD according to the set of control signals. The feedback unit 250 detects the state of + VO, -VO at the output terminal to provide the feedback signal to the main controller 230.
The load state detection apparatus 100 of the present invention is connected in parallel to the current detection unit 220, and draws a part of the current passing through the primary side switch QD as a sense current I1According to the sensing current I1And judging the working state of the output load, and when the working state is judged to be a light load state, outputting a light load signal to the isolation driver 240 to enable the isolation driver 240 to close the first switch QA and the second switch QB on the secondary side. Since the load state detection apparatus 100 is connected in parallel with the current detection unit 220 in the power supply apparatus, the impedance can be reduced to reduce the power consumption.
For convenience of explaining the circuit operation of the load state detection device 100 in the power supply device, please further refer to fig. 3, wherein the waveforms have the following meanings:
Io: output current through output load
I1: sensing current
V2: second voltage inside the load state detection apparatus 100
Vref: reference voltage inside load state detection apparatus 100
E2: light load signal output by the load state detection device 100
VOA: a first control signal for controlling the first switch QA
VOB: a second control signal for controlling the second switch QB
In the time period T0-T1, the output load is full load, and the second voltage V is applied to the load condition detecting device 1002Greater than a reference voltage VrefThe signal output by the comparator 41 is at a low level, so the isolation driver 240 normally outputs the first control signal VOA and the second control signal VOB to control the first switch QA and the second switch QB to be alternately turned ON/OFF.
In the period T1-T2, the current I is outputoAnd sensing the current I1Gradually decreasing, second voltage V in the load state detection device 1002Also exhibits a synchronous fall at a second voltage V2Has not yet fallen below the reference voltage VrefBefore, the isolation driver 240 normally outputs the first control signal VOA and the second control signal VOB to control the first switch QA and the second switch QB to be alternately turned on/off.
After time point T2, current I is outputoAnd sensing the current I1The output load has already entered a "light load" state after being reduced to a certain degree, and the load state detection device 100 is powered by the second voltage V2Less than reference voltage VrefThe comparator 41 outputs a high-level light-load signal E2To the isolation driver 240, the isolation driver 240 stops outputtingThe first control signal VOA, the second control signal VOB, the first switch QA and the second switch QB are all kept to be turned off. The secondary side rectification path of the transformer 210 only passes through the body diodes (body diodes) of the first switch QA and the second switch QB, so as to achieve the effect of light load and energy saving.
The application field of the load state detection device 100 of the present invention is not limited to the power supply device in fig. 2, but may be other devices, such as the sensing current I taken by the load state detection device 1001If only AC current or pulsating DC current is required, the sensed current I can be used1And judging whether the output load is in a light load state. When the light load state is judged, a light load signal E is output2For other circuit applications, e.g. light load signal E in this embodiment2The light load signal E is supplied to the isolation driver 240 to turn off the relevant elements on the secondary side2The use of (a) is not limited thereto.
Furthermore, the present invention uses the current transformer 11 as the main component of current sensing in the detection unit 10, and compared with using a resistance component to sense the current, the present invention can reduce the power and ensure that the secondary side of the current transformer 11 can still provide a signal with sufficient strength to determine the light load state
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A load condition detection device for connection to a power supply device to detect a condition of an output load of the power supply device, the load condition detection device comprising:
the detection unit comprises a current transformer, wherein the primary side of the current transformer is used for detecting an input current and correspondingly generating a sensing current at the secondary side;
the rectifying and filtering unit is connected with the detection unit and generates a first voltage according to the sensing current;
the amplifying unit is connected with the rectifying and filtering unit to amplify the first voltage to generate a second voltage;
and the comparison unit is connected with the amplification unit and compares the second voltage with a reference voltage to obtain a comparison result, and determines whether to output a light-load signal according to the comparison result, wherein the light-load signal is used for indicating that the output load is in a light-load state.
2. The load condition detecting device according to claim 1, wherein the rectifying and filtering unit comprises:
the anode of the rectifying diode is connected with the secondary side of the current transformer and allows the sensing current to pass through the rectifying diode;
a first capacitor and a first resistor are connected in parallel and then connected between the negative electrode of the rectifier diode and the ground.
3. The load condition detection device according to claim 2, wherein the amplifying unit comprises:
and the non-inverting input end of the operational amplifier is connected to the cathode of the rectifier diode, the operational amplifier amplifies the first voltage, and the second voltage is output at the output end of the operational amplifier.
4. The load condition detection device according to claim 3, wherein the comparison unit comprises:
one input end of the comparator receives the reference voltage, the other input end of the comparator receives the second voltage, and one output end of the comparator is used for outputting the light load signal.
5. The load condition detecting device according to claim 4, wherein the positive input terminal of the comparator is connected to a voltage dividing circuit for receiving the reference voltage generated by the voltage dividing circuit; the negative input end of the comparator is connected with the output end of the operational amplifier to receive the second voltage.
6. The load condition detecting device according to claim 5, wherein the rectifying and filtering unit comprises:
the second resistor is connected between the anode of the rectifying diode and the secondary side of the current transformer in series;
a third resistor connected across the secondary side of the current transformer.
7. The load condition detection device according to claim 5, wherein the voltage dividing circuit comprises:
the fourth resistor and the fifth resistor are connected in series between a working voltage and the ground, wherein a series node of the fourth resistor and the fifth resistor is a voltage division node.
8. The apparatus according to claim 7, wherein the comparing unit further comprises a hysteresis circuit, the hysteresis circuit comprising a diode, a sixth resistor and a seventh resistor;
the diode and the sixth resistor are connected in series and then connected between the output end of the comparator and the positive input end of the comparator;
the seventh resistor is connected between the positive input end of the comparator and the voltage dividing node of the voltage dividing circuit in a bridging mode.
9. The apparatus according to claim 8, wherein a second capacitor is connected between the non-inverting input terminal of the operational amplifier and ground; a third capacitor is connected between the inverting input terminal and the output terminal of the operational amplifier.
10. The apparatus according to claim 9, wherein the comparator outputs the light load signal at a high level when the second voltage is lower than the reference voltage.
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| CN201910249258.8A CN111830424B (en) | 2019-03-29 | 2019-03-29 | Load state detection device |
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| CN111830424B (en) | 2023-07-25 |
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