Back to results
US 12,588,125 B2Granted
Hysteresis circuit, emergency lighting circuit and lighting device
AssigneesOpple Lighting Co., Ltd., Suzhou Opple Lighting Co., Ltd.
InventorsXinsheng Liu, Guangchuan Zhu
Life of this patent
Estimating the term…
Abstract
The present disclosure discloses a hysteresis circuit, an emergency lighting circuit, and a lighting device. The hysteresis circuit includes a voltage detection module, an isolation coupling module, and a voltage adjusting module. By detecting the sampling voltage associated with the input voltage, in the case that the sampling voltage is detected to decrease to the trigger action voltage point, the corresponding level of the output signal flips until it is detected that the sampling voltage rises to the reverse recovery voltage point, and the corresponding level of the output signal is controlled to flip again, thus achieving timely and accurate judgment of input voltage status.
Claims10
A hysteresis circuit, comprising:
- a voltage detection module, configured to receive an input voltage and generate a sampling voltage based on the input voltage, and detect the sampling voltage, wherein the voltage detection module comprises:
- one or more first voltage divider resistor, a second voltage divider resistor, a first capacitor, and a voltage regulator, wherein the one or more first voltage divider resistor is connected to the second voltage divider resistor to form a first node, the one or more first voltage divider resistor and the second voltage divider resistor are configured to divide the input voltage so that a voltage of the first node is the sampling voltage, the second voltage divider resistor is electrically connected to the first capacitor and the voltage regulator, and the voltage regulator is configured to obtain the sampling voltage;
- an isolation coupling module, wherein the isolation coupling module is connected to the voltage regulator and configured to control an output signal of the isolation coupling module based on the sampling voltage;
- and
- a voltage adjusting module, configured to adjust the sampling voltage;
- wherein in a case that the voltage detection module detects that the sampling voltage is less than a first set value, an optocoupler in the isolation coupling module is controlled to be in an isolating state, so that the output signal of the isolation coupling module is a first level signal, and the voltage adjusting module begins to adjust the sampling voltage;
- in a case that the voltage detection module detects that the sampling voltage is greater than a second set value, the optocoupler is controlled to be in a coupling state, so that the output signal of the isolation coupling module is a second level signal, and the voltage adjusting module stops adjusting the sampling voltage, the second set value is greater than the first set value, and a difference between the second set value and the first set value is greater than a preset threshold, the first level signal is different from the second level signal.
4 more elements
An emergency lighting circuit, comprising:
- a rectification circuit, configured to convert an input AC power into a DC power to provide the DC power to the hysteresis circuit;
- a hysteresis circuit that comprises:
- a voltage detection module, configured to receive an input voltage and generate a sampling voltage based on the input voltage, and detect the sampling voltage, wherein the voltage detection module comprises:
- one or more first voltage divider resistor, a second voltage divider resistor, a first capacitor, and a voltage regulator, wherein the one or more first voltage divider resistor is connected to the second voltage divider resistor to form a first node, the one or more first voltage divider resistor and the second voltage divider resistor are configured to divide the input voltage so that a voltage of the first node is the sampling voltage, the second voltage divider resistor is electrically connected to the first capacitor and the voltage regulator, and the voltage regulator is configured to obtain the sampling voltage;
- an isolation coupling module, wherein the isolation coupling module is connected to the voltage regulator and configured to control an output signal of the isolation coupling module based on the sampling voltage;
- and
- a voltage adjusting module, configured to adjust the sampling voltage;
- wherein in a case that the voltage detection module detects that the sampling voltage is less than a first set value, an optocoupler in the isolation coupling module is controlled to be in an isolating state, so that the output signal of the isolation coupling module is a first level signal, and the voltage adjusting module begins to adjust the sampling voltage;
- in a case that the voltage detection module detects that the sampling voltage is greater than a second set value, the optocoupler is controlled to be in a coupling state, so that the output signal of the isolation coupling module is a second level signal, and the voltage adjusting module stops adjusting the sampling voltage, the second set value is greater than the first set value, and a difference between the second set value and the first set value is greater than a preset threshold, the first level signal is different from the second level signal;
- and
- a control circuit, configured to control an operation of an indicator light or a relay based on the output signal of the isolation coupling module in the hysteresis circuit.
8 more elements
A lighting device, comprising an emergency lighting circuit, wherein the emergency lighting circuit comprises:
- a rectification circuit, configured to convert an input AC power into a DC power to provide the DC power to the hysteresis circuit;
- a hysteresis circuit that comprises:
- a voltage detection module, configured to receive an input voltage and generate a sampling voltage based on the input voltage, and detect the sampling voltage, wherein the voltage detection module comprises:
- one or more first voltage divider resistor, a second voltage divider resistor, a first capacitor, and a voltage regulator, wherein the one or more first voltage divider resistor is connected to the second voltage divider resistor to form a first node, the one or more first voltage divider resistor and the second voltage divider resistor are configured to divide the input voltage so that a voltage of the first node is the sampling voltage, the second voltage divider resistor is electrically connected to the first capacitor and the voltage regulator, and the voltage regulator is configured to obtain the sampling voltage;
- an isolation coupling module, wherein the isolation coupling module is connected to the voltage regulator and configured to control an output signal of the isolation coupling module based on the sampling voltage;
- and
- a voltage adjusting module, configured to adjust the sampling voltage;
- wherein in a case that the voltage detection module detects that the sampling voltage is less than a first set value, an optocoupler in the isolation coupling module is controlled to be in an isolating state, so that the output signal of the isolation coupling module is a first level signal, and the voltage adjusting module begins to adjust the sampling voltage;
- in a case that the voltage detection module detects that the sampling voltage is greater than a second set value, the optocoupler is controlled to be in a coupling state, so that the output signal of the isolation coupling module is a second level signal, and the voltage adjusting module stops adjusting the sampling voltage, the second set value is greater than the first set value, and a difference between the second set value and the first set value is greater than a preset threshold, the first level signal is different from the second level signal;
- and
- a control circuit, configured to control an operation of an indicator light or a relay based on the output signal of the isolation coupling module in the hysteresis circuit.
8 more elements
Dependencies are inferred from the claim text.