Frequency signal generating circuit and liquid level detecting circuit
A technology for generating circuit and frequency signals, applied in liquid/fluid solid measurement, liquid level indicator for physical variable measurement, measurement device, etc., can solve problems such as high power requirements, and achieve the effect of stable water level and voltage
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0037] The frequency signal generation circuit is used to control the charge and discharge of the first capacitor C1 to generate a pulsating DC voltage signal. In this embodiment, the first switch circuit is the first switch S1, the second switch circuit is the second switch S2, and the control circuit is the controller for illustration. Such as figure 1 As shown, specifically, when the controller controls the first switch S1 to be turned on and the second switch S2 to be turned off, the DC power supply VCC charges the first capacitor C1 through the first resistor R1, and the voltage across the first capacitor C1 continues to increase. ; When the controller controls the first switch S1 to be disconnected and the second switch S2 to be closed, the first capacitor C1, the second resistor R2 and the ground form a closed loop, the first capacitor C1 is discharged, and the voltage across the first capacitor C1 is constant decrease. Such as figure 2 As shown, the voltage across ...
Embodiment 2
[0041] Such as Figure 4 As shown, the embodiment of the present invention provides a frequency signal generation circuit, wherein the control circuit is the PWM signal output terminal of the main control chip, the first switch circuit includes a bias resistor R4 and a first triode Q1, and the second switch The circuit includes a bias resistor R5 and a second transistor Q2. The first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor.
[0042] In this embodiment, the high level of the PWM signal output terminal should not be higher than the DC power supply VCC, which can be set by those skilled in the art according to the actual situation, which is not limited in this embodiment.
[0043] The bias resistor R4 and the bias resistor R5 are connected in parallel to the PWM signal output terminal of the main control chip, the base of the first triode Q1 is connected to the other end of the bias resistor R4, the emitter is connected to the DC powe...
Embodiment 3
[0050] Such as Figure 5 As shown, the embodiment of the present invention provides a frequency signal generation circuit. In the frequency signal generation circuit, the control circuit includes a main control chip, a bias resistor R6, a third triode Q3, a bias resistor R7 and a fourth Transistor Q4. The first switch circuit includes a bias resistor R4 and a first transistor Q1, and the second switch circuit includes a bias resistor R5 and a second transistor Q2. The first transistor Q1 is a PNP transistor, the second transistor Q2 is an NPN transistor, the third transistor Q3 is an NPN transistor, and the fourth transistor Q4 is a PNP transistor.
[0051] The PWM signal output terminal of the main control chip is connected in parallel with the bias resistor R6 and the bias resistor R7 at the same time, the base of the third transistor Q3 is connected to the other end of the bias resistor R6, the emitter is grounded, and the collector is connected to the bias resistor Conne...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com