Capacitor-Driven Battery Switch Circuit for High-Side Switching
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Solution Overview
Problem
Existing battery switch driving circuits require expensive and bulky components like transformers and buffers to drive high-side semiconductor switches, leading to increased product size and cost.
Innovation Solution
A battery switch driving circuit utilizing a switch, a capacitor, and a diode to drive the battery switch, eliminating the need for transformers and buffers, and allowing for a back-to-back configuration for quick switch-off capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer and buffer are used to drive high-side semiconductor switches, then the switching operation can be achieved, but the product size and cost increase
Solution Approach 1:
The patent extracts and eliminates the transformer and buffer components from the traditional high-side switch driving circuit. By removing these bulky components and replacing them with a capacitor-based voltage boosting circuit, the invention achieves the same switching function while dramatically reducing product size.
Solution Approach 2:
The patent replaces expensive, bulky transformers with inexpensive capacitors and diodes. The capacitor-based voltage multiplier circuit uses low-cost components to achieve the necessary voltage levels for driving high-side switches, reducing both cost and size.
2Reliability
If a transformer and buffer are used to drive high-side semiconductor switches, then the switching operation can be achieved, but the product price increases
Solution Approach 1:
The patent replaces expensive transformers with inexpensive capacitors and diodes. The capacitor-based voltage multiplier circuit uses low-cost components to achieve the necessary voltage levels for driving high-side switches, reducing both cost and size.
Solution Approach 2:
The patent uses a capacitor to copy and amplify the PWM signal voltage levels instead of using a transformer. The capacitor-based voltage multiplier creates the necessary high voltage for gate driving through charge accumulation, providing a cost-effective alternative to traditional transformer-based isolation.
3Reliability
If a transformer-based isolation method is used, then galvanic isolation can be achieved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the transformer and buffer components from the traditional high-side switch driving circuit. By removing these bulky components and replacing them with a capacitor-based voltage boosting circuit, the invention achieves the same switching function while dramatically reducing product size.
Solution Approach 2:
The patent uses capacitors as intermediaries to transfer energy and signal from the low-side to the high-side switch gate. The capacitor-based voltage multiplier acts as a mediator that provides both voltage amplification and galvanic isolation without requiring a transformer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution reduces the size and cost of the battery switch driving circuit while enabling efficient and quick switching operations, addressing the limitations of existing technologies.
Implementation Method 1
a first capacitor which is charged or discharged according to on/off of a second switch operated by a PWM signal
Implementation Method 2
a second capacitor which is charged according to on/off of the second switch by a voltage charged in the first capacitor, so as to turn on the first switch
Implementation Method 3
a battery switch driving circuit for driving a battery switch using a switch, a capacitor, and a diode
Data Source
AI summary
A battery switch driving circuit according to an embodiment of the present invention comprises: a first battery input terminal and a second battery input terminal; a converter positioned between the first battery input terminal and the second battery input terminal; a first switch positioned between the second battery input terminal and the converter, so as to cut off a power input of the second battery input terminal when turned off; and a switch driving unit for turning on the first switch, wherein the switch driving unit comprises: a first capacitor which is charged or discharged according to on/off of a second switch operated by a PWM signal; and a second capacitor which is charged according to on/off of the second switch by a voltage charged in the first capacitor, so as to turn on the first switch.