{"id":6790,"date":"2023-01-24T15:15:29","date_gmt":"2023-01-24T07:15:29","guid":{"rendered":"https:\/\/lorentzzi.com\/?p=6790"},"modified":"2025-07-07T10:29:29","modified_gmt":"2025-07-07T02:29:29","slug":"solid-state-relay-working-principle","status":"publish","type":"post","link":"https:\/\/lorentzzi.com\/tr\/solid-state-relay-working-principle\/","title":{"rendered":"Kat\u0131 Hal R\u00f6lesi \u00c7al\u0131\u015fma Prensibi"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6790\" class=\"elementor elementor-6790\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-abbf6bb e-flex e-con-boxed e-con e-parent\" data-id=\"abbf6bb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2127e01 elementor-toc--content-ellipsis elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"2127e01\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;marker_view&quot;:&quot;bullets&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;fas fa-circle&quot;,&quot;library&quot;:&quot;fa-solid&quot;},&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h2 class=\"elementor-toc__header-title\">\n\t\t\t\tContents\t\t\t<\/h2>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__2127e01\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__2127e01\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__2127e01\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fb36203 elementor-widget elementor-widget-heading\" data-id=\"fb36203\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-large\">Overview<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca0f594 elementor-widget elementor-widget-text-editor\" data-id=\"ca0f594\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Although there are many models and specifications of solid state relays on the market, the working principles of solid state relays are basically similar. It is mainly composed of three parts: input (control) circuit, drive circuit and output (load) circuit. The working principle of the solid state relay is illustrated below through two working principle diagrams of the solid state relay.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55f7e5c elementor-widget elementor-widget-heading\" data-id=\"55f7e5c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-large\">Schematic diagram 1 of solid state relay<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a9d1cad elementor-widget elementor-widget-image\" data-id=\"a9d1cad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"565\" height=\"330\" src=\"https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-1.jpg\" class=\"attachment-large size-large wp-image-6788\" alt=\"\" srcset=\"https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-1.jpg 565w, https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-1-300x175.jpg 300w, https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-1-64x37.jpg 64w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8d2c7b2 elementor-widget elementor-widget-text-editor\" data-id=\"8d2c7b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The truncated sinusoidal signals taken from DW1 and DW2 output square waves through inverter BG1, and then output peak pulse signals through operational amplifier A. Spike pulses are added between the AC diagonal lines of D3~D6 and the control pole and cathode of the SCR, and the DC diagonal lines of D3~D6 are connected to the output end of the photocoupler. When a low-voltage and small-current signal is input from A and B, the diode emits light and the photosensitive tube is turned on, so the peak pulse output from the A operational amplifier triggers the SCR to turn on, and the angular load RL is energized. When there is no signal input from A and B, the photocoupler BG2 is cut off, and the peak pulse cannot pass through, so that the SCR cannot be turned on.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f319c61 elementor-widget elementor-widget-heading\" data-id=\"f319c61\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-large\">Schematic diagram 2 of solid state relay:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7da7342 elementor-widget elementor-widget-image\" data-id=\"7da7342\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"565\" height=\"293\" src=\"https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-2.jpg\" class=\"attachment-large size-large wp-image-6789\" alt=\"\" srcset=\"https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-2.jpg 565w, https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-2-300x156.jpg 300w, https:\/\/lorentzzi.com\/wp-content\/uploads\/2023\/01\/Solid-state-relay-working-principle-2-64x33.jpg 64w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d0fd5fb elementor-widget elementor-widget-text-editor\" data-id=\"d0fd5fb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>When there is no input signal, the phototransistor in GD is cut off, and VT1 is an AC voltage zero-point detector, which obtains base current through R3 and conducts in saturation, clamps the gate of VTH at a low potential and is in an off state. When there is an input signal, the phototransistor is turned on, and the state of VTH is determined by VT1 at this time. When the power supply voltage is greater than the zero-crossing voltage, the voltage of the voltage dividing point P of the voltage divider R3 and R2 is greater than VBE1, and VT1 is saturated and turned on. The gate of the SCR is closed because it is clamped at a low potential, and the gate of the TR is in an off state because there is no trigger pulse. Only when the power supply voltage is lower than the zero-crossing voltage and the voltage at point P is lower than VBE1, G1 will be cut off, and the SCR gate will be turned on by receiving the trigger signal. When the trigger pulse is obtained at the gate of TR, TR is turned on. Thereby turning on the load power.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6436eb elementor-widget elementor-widget-heading\" data-id=\"a6436eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-large\">Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fe860f3 elementor-widget elementor-widget-text-editor\" data-id=\"fe860f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Here above are two working principles for the solid state relay, generally,&nbsp;<span style=\"text-align: var(--text-align); background-color: var(--ast-global-color-5);\">solid state relays have been widely used in computer peripheral interface devices, electric furnace heating constant temperature systems, numerical control machinery, remote control systems, industrial automation devices; signal lights, scintillators, lighting stage lighting control systems; instrumentation, medical equipment, copiers, automatic washing machines; automatic Fire protection, security systems, and switching switches for power capacitors used as grid power factor compensation, etc. In addition, solid-state relays are widely used in chemical, coal mines and other occasions that require explosion-proof, moisture-proof, and corrosion resistance.<\/span><\/p><p><span style=\"font-style: inherit; font-weight: inherit; text-align: var(--text-align); background-color: var(--ast-global-color-5); color: var(--ast-global-color-3);\">Solid state relays have good moisture-proof, mildew-proof and anti-corrosion properties, and are also excellent in explosion-proof and ozone pollution prevention. Solid-state relays also have low input power, high sensitivity, low control power, good electromagnetic compatibility, low noise and low operating frequency. advanced features.<\/span><br><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Contents Overview Although there are many models and specifications of solid state relays on the market, the working principles of solid state relays are basically similar. It is mainly composed of three parts: input (control) circuit, drive circuit and output (load) circuit. The working principle of the solid state relay is illustrated below through two [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6788,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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