CN220254485U - Control circuit capable of detecting duty ratio of PWM (pulse-Width modulation) signal and adjusting threshold value - Google Patents
Control circuit capable of detecting duty ratio of PWM (pulse-Width modulation) signal and adjusting threshold value Download PDFInfo
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- CN220254485U CN220254485U CN202322059343.2U CN202322059343U CN220254485U CN 220254485 U CN220254485 U CN 220254485U CN 202322059343 U CN202322059343 U CN 202322059343U CN 220254485 U CN220254485 U CN 220254485U
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- 230000009286 beneficial effect Effects 0.000 description 1
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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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Abstract
The utility model discloses a control circuit capable of detecting the duty ratio of a PWM signal and adjusting the threshold value, which comprises a PWM digital-to-analog conversion duty ratio detection circuit, a power section detection circuit and a power supply switch electrifying control circuit, wherein the input end of the PWM digital-to-analog conversion duty ratio detection circuit is connected with a master control PWM generating circuit, the input ends of the power section detection circuit and the power supply switch electrifying control circuit are respectively connected with the output end of the PWM digital-to-analog conversion duty ratio detection circuit, and are connected with a master control circuit after being connected with a PF correction circuit, and the other power supply switch electrifying control circuit is subsequently connected with the master control circuit.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a control circuit capable of detecting the duty ratio of PWM signals and adjusting threshold values.
Background
As each electrical appliance industry moves into the intelligent control era, the demand for intelligent control is becoming more and more widespread and generalized, and standby power consumption of electrical appliances is particularly important when equipment is turned off in an external wireless control manner. While standby power consumption is long-lasting, the standby time of most appliances per day is much longer than the use time. Therefore, for intelligent appliances, low standby and high efficiency are an index that must be quantified and checked. Taking the current intelligent lighting industry as an example, the power consumption of the intelligent LED lamp is not low in standby, and when the power is lower than a certain value, the PF correction circuit cannot stop working, so that the operation efficiency of low-power-section equipment is low, and improvement and optimization are urgently needed.
In the prior art, one is to control the output PWM signal, close the output, the circuit stands by the circuit itself, and the PF correction circuit is in the frequency hopping standby working state. However, with the scheme, in the equipment, the power supply of each switch is started and the loss of the feedback circuit cannot be closed, so that the power consumption is reduced for a long time; or the standby loss of the DC power supply part cannot be closed, the frequency hopping standby of the PF correction circuit is not completely closed, only the limited standby power consumption can be realized, and the equipment efficiency is lower at the moment due to the fact that the PF is not closed at low power, so that the PF correction circuit is also the current state of the lighting industry.
And secondly, the relay or the controllable silicon is controlled by the PWM signal which is additionally and independently controlled to close the high-voltage commercial power in a forced way, and the PWM signal which is synchronously controlled to be output is controlled to close the output, so that low standby is realized. However, by using the scheme, the structure is complex, the cost is high, the switch strong current operation has failure risk, and the lightning surge has uncertainty risk.
There is therefore a need for a control circuit with an adjustable threshold value and a detectable PWM signal duty cycle that is adaptable, simple in circuit construction, low in circuit cost price, and avoids the stability problems of high voltage control by employing a low voltage control and current limiting design.
Disclosure of Invention
The utility model mainly aims to provide a control circuit which has wide adaptability, simple circuit structure and low circuit cost price, and can detect the PWM signal duty ratio and can adjust the threshold value by adopting a low-voltage control and current limiting design and avoiding the stability problem of high-voltage control.
The utility model provides a control circuit capable of detecting the duty ratio of a PWM signal and adjusting the threshold value, which comprises a PWM digital-to-analog conversion duty ratio detection circuit, a power section detection circuit and a power supply switch electrifying control circuit, wherein the input end of the PWM digital-to-analog conversion duty ratio detection circuit is connected with a main control PWM generating circuit;
the PWM digital-to-analog conversion duty ratio detection circuit comprises resistors R1, R2, R3 and R4 and a capacitor C1, wherein the master control PWM generation circuit is connected with the resistor R1, the other end of the resistor R1 is respectively connected with the resistors R2 and R4 and one end of the capacitor C1, the other end of the resistor R4 is connected with the power supply switch power-on control circuit, the other end of the resistor R2 is connected with the power section detection circuit, and the other end of the resistor R2 is grounded after being connected through the resistor R3; the duty ratio of the PWM signal of any frequency can be sampled and prevented from being triggered by mistake by adjusting the sizes of the resistors R1, R2 and R3 and the capacitor C1.
Preferably, the PWM digital-to-analog conversion duty ratio detection circuit further includes a plurality of diodes, and the master PWM generation circuit is connected to the resistor R1 through the plurality of diodes.
Preferably, the power section detection circuit comprises triodes Q1 and Q2 and resistors R5 and R6, wherein a base electrode of the triode Q1 is connected with the resistor R2, an emitter electrode of the triode Q1 is grounded, an emitter electrode of the triode Q1 is connected with one end of the resistor R5 and the base electrode of the triode Q2 respectively after being connected with the resistor R6, the other ends of the emitter electrode of the triode Q2 and the resistor R5 are connected with a power supply end, a collector electrode of the triode Q2 is connected with the PF correction circuit through a resistor R10, and the PF correction circuit is subsequently connected with the main control circuit.
Preferably, the power supply switch energizing control circuit comprises triodes Q3 and Q4 and resistors R7, R8 and R9, wherein a base electrode of the triode Q3 is connected with the resistor R4, an emitter electrode of the triode Q3 is grounded, an emitter electrode of the triode Q3 is connected with one end of the resistor R7 and the base electrode of the triode Q4 respectively after being connected with the resistor R8, the other ends of the emitter electrode of the triode Q2 and the resistor R5 are connected with a power supply end, and a collector electrode of the triode Q4 is connected with the main control circuit through the resistor R9.
The control circuit capable of detecting the duty ratio of the PWM signal and adjusting the threshold has the beneficial effects that:
1. by using a PWM digital-to-analog conversion duty cycle detection circuit, the duty cycle of a PWM signal of any frequency can be sampled and guaranteed not to be false triggered by adjusting the magnitudes of resistors R1, R2 and R3 and capacitor C1.
2. The ultra-low standby power consumption can be realized, and the efficiency of the low power section is improved.
3. The circuit has simple structure, large-scale universal use value, extremely low cost of the whole circuit, real-time dynamic detection of PWM duty ratio, adjustable threshold value, and suitability for wide-range multi-industry application.
4. Adopts the design of low-voltage control and current limiting, avoids the stability problem of high-voltage control,
drawings
FIG. 1 is a schematic circuit diagram of a control circuit of the present utility model with an adjustable threshold and a detectable PWM signal duty cycle;
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1, an embodiment of the control circuit of the present utility model is presented that can detect the duty cycle of the PWM signal and the threshold value can be adjusted:
a control circuit capable of detecting the duty ratio of a PWM signal and adjusting the threshold value comprises a PWM digital-to-analog conversion duty ratio detection circuit, a power section detection circuit and a power supply switch electrifying control circuit.
The PWM digital-to-analog conversion duty ratio detection circuit includes resistors R1, R2, R3, and R4, diodes D1 to DN, and a capacitor C1. The master PWM generation circuit is connected to resistor R1 through diodes D1 to DN. The other end of the resistor R1 is connected with the resistors R2 and R4 and one end of the capacitor C1 respectively, the other end of the resistor R4 is connected with the power supply switch power-on control circuit, the other end of the resistor R2 is connected with the power section detection circuit, and the other end of the resistor R2 is grounded after being connected through the resistor R3; the duty ratio of the PWM signal of any frequency can be sampled and prevented from being triggered by mistake by adjusting the sizes of the resistors R1, R2 and R3 and the capacitor C1.
The power section detection circuit comprises triodes Q1 and Q2 and resistors R5 and R6, wherein the base electrode of the triode Q1 is connected with the resistor R2, the emitter electrode of the triode Q1 is grounded, the emitter electrode of the triode Q1 is connected with one end of the resistor R5 and the base electrode of the triode Q2 respectively after being connected with the resistor R6, the emitter electrode of the triode Q2 and the other end of the resistor R5 are connected with a power supply end, the collector electrode of the triode Q2 is connected with the PF correction circuit through the resistor R10, and the PF correction circuit is subsequently connected with the main control circuit. The on-voltage of the transistor serves as a detection voltage threshold. The power supply switch on-off control of the PF correction circuit by the power section detection circuit can be realized.
The power supply switch power-on control circuit comprises triodes Q3 and Q4 and resistors R7, R8 and R9, wherein a base electrode of the triode Q3 is connected with the resistor R4, an emitter electrode of the triode Q3 is grounded, an emitter electrode of the triode Q3 is connected with the resistor R8 and then is respectively connected with one end of the resistor R7 and the base electrode of the triode Q4, the other ends of the emitter electrode of the triode Q2 and the resistor R5 are connected with a power supply end, and a collector electrode of the triode Q4 is connected with the main control circuit through the resistor R9. The on-voltage of the transistor serves as a detection voltage threshold.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.
Claims (4)
1. A control circuit capable of detecting the duty ratio of a PWM signal and adjusting the threshold value is characterized in that,
the power supply device comprises a PWM digital-to-analog conversion duty ratio detection circuit, a power section detection circuit and a power supply switch electrifying control circuit, wherein the input end of the PWM digital-to-analog conversion duty ratio detection circuit is connected with a main control PWM generating circuit;
the PWM digital-to-analog conversion duty ratio detection circuit comprises resistors R1, R2, R3 and R4 and a capacitor C1, wherein the master control PWM generation circuit is connected with the resistor R1, the other end of the resistor R1 is respectively connected with the resistors R2 and R4 and one end of the capacitor C1, the other end of the resistor R4 is connected with the power supply switch power-on control circuit, the other end of the resistor R2 is connected with the power section detection circuit, and the other end of the resistor R2 is grounded after being connected through the resistor R3; the duty ratio of the PWM signal of any frequency can be sampled and prevented from being triggered by mistake by adjusting the sizes of the resistors R1, R2 and R3 and the capacitor C1.
2. The control circuit of claim 1, wherein the PWM digital-to-analog conversion duty cycle detection circuit further comprises a plurality of diodes, and the master PWM generation circuit is connected to the resistor R1 via the plurality of diodes.
3. The control circuit capable of detecting the duty ratio of a PWM signal and with an adjustable threshold value according to claim 1, wherein the power section detection circuit comprises triodes Q1 and Q2 and resistors R5 and R6, a base electrode of the triode Q1 is connected with the resistor R2, an emitter electrode of the triode Q1 is grounded, an emitter electrode of the triode Q1 is connected with one end of the resistor R5 and a base electrode of the triode Q2 after being connected with the resistor R6, an emitter electrode of the triode Q2 and the other end of the resistor R5 are connected with a power supply end, a collector electrode of the triode Q2 is connected with the PF correction circuit through a resistor R10, and the PF correction circuit is subsequently connected with the main control circuit.
4. The control circuit capable of detecting the duty ratio of the PWM signal and adjusting the threshold value according to claim 3, wherein the power supply switch energizing control circuit comprises transistors Q3 and Q4 and resistors R7, R8 and R9, the base electrode of transistor Q3 is connected with resistor R4, the emitter electrode of transistor Q3 is grounded, the emitter electrode of transistor Q3 is connected with one end of resistor R7 and the base electrode of transistor Q4 respectively after being connected with resistor R8, the emitter electrode of transistor Q2 and the other end of resistor R5 are connected with the power supply terminal, and the collector electrode of transistor Q4 is connected with the master control circuit through resistor R9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322059343.2U CN220254485U (en) | 2023-08-02 | 2023-08-02 | Control circuit capable of detecting duty ratio of PWM (pulse-Width modulation) signal and adjusting threshold value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322059343.2U CN220254485U (en) | 2023-08-02 | 2023-08-02 | Control circuit capable of detecting duty ratio of PWM (pulse-Width modulation) signal and adjusting threshold value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220254485U true CN220254485U (en) | 2023-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322059343.2U Active CN220254485U (en) | 2023-08-02 | 2023-08-02 | Control circuit capable of detecting duty ratio of PWM (pulse-Width modulation) signal and adjusting threshold value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220254485U (en) |
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2023
- 2023-08-02 CN CN202322059343.2U patent/CN220254485U/en active Active
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