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Switched Capacitor Converter

A technology of switching capacitors and switches, applied in output power conversion devices, electric light sources, electrical components, etc., can solve problems such as output power variation and low efficiency

Active Publication Date: 2019-08-02
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Switched capacitor converters with only one slew rate have limited linear regulation, causing not only low efficiency but also large output power variations
This unregulated output voltage is unacceptable when voltage accuracy is critical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] first reference Figure 1a and Figure 1b , which illustrates a system 100 in which a SAR SCC according to an embodiment described below is implemented as a general purpose DC-DC converter ( Figure 1a ) and a system 150 in which a SAR SCC according to embodiments described below is implemented as a light emitting diode (LED) driver.

[0037] Both systems 100 and 150 include a switched capacitor power chain 102 and a controller 104 . The switched capacitor power chain 102 is output by the input voltage V from the power supply 101 in powered by.

[0038] The controller 104 includes an analog-to-digital converter (ADC) 110 , a voltage reference (Ref) 114 , a digitally controlled oscillator (DCO) 106 , and a finite state machine (FSM) 108 configured to provide a digital code 112 .

[0039] In system 100, the output voltage is sensed in a DC-DC converter. In system 150, however, the LED driver senses the current through the sense resistor Rs, keeping the LED current cont...

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PUM

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Abstract

A system comprising: a switched capacitor circuit including a plurality of voltage divider circuit stages including a first voltage divider circuit stage coupled to a second voltage divider circuit stage; and a controller, configured to supply a clock signal to a first voltage divider circuit stage to provide a first voltage on an output node of the first voltage divider circuit stage during a first half cycle of the clock signal, and to provide a first voltage on an output node of the first voltage divider circuit stage during a second half cycle of the clock signal A second voltage is provided on the output node during a half cycle. The second voltage divider circuit stage is configured to charge to the input voltage during a half cycle of the clock signal, and the controller is configured to synchronize the charging of the second voltage divider circuit stage to a selected one of: ( i) a first half cycle of a clock signal, wherein a first voltage is supplied as said input voltage, and (ii) a second half cycle of a clock signal, wherein a second voltage is supplied as said input voltage.

Description

Background technique [0001] Since the current trend in solid-state lighting (SSL) is modularization and integration, distributed drivers are gaining popularity due to their flexibility, area efficiency, and low cost. Switched capacitor converters (SCCs), which transfer energy using only capacitors, eliminate the use of inductive components, making such converters an advantageous topology like distributed drives. [0002] One aspect of implementing a distributed driver is a "driver on board", where the driver and light source are combined together on a carrier board. The power supply for such boards varies from a regulated standard voltage to an unregulated wide-range voltage, making it difficult for the driver to maintain high performance. For example, to be compatible with the Power over Ethernet (PoE) standard, which has a custom voltage range of 44V to 57V, these drivers necessitate good line regulation and thus high efficiency. [0003] As a result, as mentioned before, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07H05B44/00
CPCH02M3/07H02M1/007H05B45/37Y02B20/30
Inventor 姜俊敏付洁徐庶
Owner SIGNIFY HLDG BV